SemaDeclCXX.cpp revision 2cf9d656f6283f2a8be0549da110d7cfbb1ea4b2
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(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 140 141 // Okay: add the default argument to the parameter 142 Param->setDefaultArg(Arg); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 152 Expr *DefaultArg) { 153 if (!param || !DefaultArg) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 // Default arguments are only permitted in C++ 160 if (!getLangOptions().CPlusPlus) { 161 Diag(EqualLoc, diag::err_param_default_argument) 162 << DefaultArg->getSourceRange(); 163 Param->setInvalidDecl(); 164 return; 165 } 166 167 // Check that the default argument is well-formed 168 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 169 if (DefaultArgChecker.Visit(DefaultArg)) { 170 Param->setInvalidDecl(); 171 return; 172 } 173 174 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 175} 176 177/// ActOnParamUnparsedDefaultArgument - We've seen a default 178/// argument for a function parameter, but we can't parse it yet 179/// because we're inside a class definition. Note that this default 180/// argument will be parsed later. 181void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 182 SourceLocation EqualLoc, 183 SourceLocation ArgLoc) { 184 if (!param) 185 return; 186 187 ParmVarDecl *Param = cast<ParmVarDecl>(param); 188 if (Param) 189 Param->setUnparsedDefaultArg(); 190 191 UnparsedDefaultArgLocs[Param] = ArgLoc; 192} 193 194/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 195/// the default argument for the parameter param failed. 196void Sema::ActOnParamDefaultArgumentError(Decl *param) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 202 Param->setInvalidDecl(); 203 204 UnparsedDefaultArgLocs.erase(Param); 205} 206 207/// CheckExtraCXXDefaultArguments - Check for any extra default 208/// arguments in the declarator, which is not a function declaration 209/// or definition and therefore is not permitted to have default 210/// arguments. This routine should be invoked for every declarator 211/// that is not a function declaration or definition. 212void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 213 // C++ [dcl.fct.default]p3 214 // A default argument expression shall be specified only in the 215 // parameter-declaration-clause of a function declaration or in a 216 // template-parameter (14.1). It shall not be specified for a 217 // parameter pack. If it is specified in a 218 // parameter-declaration-clause, it shall not occur within a 219 // declarator or abstract-declarator of a parameter-declaration. 220 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 221 DeclaratorChunk &chunk = D.getTypeObject(i); 222 if (chunk.Kind == DeclaratorChunk::Function) { 223 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 224 ParmVarDecl *Param = 225 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 226 if (Param->hasUnparsedDefaultArg()) { 227 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 228 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 229 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 230 delete Toks; 231 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 232 } else if (Param->getDefaultArg()) { 233 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 234 << Param->getDefaultArg()->getSourceRange(); 235 Param->setDefaultArg(0); 236 } 237 } 238 } 239 } 240} 241 242// MergeCXXFunctionDecl - Merge two declarations of the same C++ 243// function, once we already know that they have the same 244// type. Subroutine of MergeFunctionDecl. Returns true if there was an 245// error, false otherwise. 246bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 247 bool Invalid = false; 248 249 // C++ [dcl.fct.default]p4: 250 // For non-template functions, default arguments can be added in 251 // later declarations of a function in the same 252 // scope. Declarations in different scopes have completely 253 // distinct sets of default arguments. That is, declarations in 254 // inner scopes do not acquire default arguments from 255 // declarations in outer scopes, and vice versa. In a given 256 // function declaration, all parameters subsequent to a 257 // parameter with a default argument shall have default 258 // arguments supplied in this or previous declarations. A 259 // default argument shall not be redefined by a later 260 // declaration (not even to the same value). 261 // 262 // C++ [dcl.fct.default]p6: 263 // Except for member functions of class templates, the default arguments 264 // in a member function definition that appears outside of the class 265 // definition are added to the set of default arguments provided by the 266 // member function declaration in the class definition. 267 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 268 ParmVarDecl *OldParam = Old->getParamDecl(p); 269 ParmVarDecl *NewParam = New->getParamDecl(p); 270 271 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 272 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 273 // hint here. Alternatively, we could walk the type-source information 274 // for NewParam to find the last source location in the type... but it 275 // isn't worth the effort right now. This is the kind of test case that 276 // is hard to get right: 277 278 // int f(int); 279 // void g(int (*fp)(int) = f); 280 // void g(int (*fp)(int) = &f); 281 Diag(NewParam->getLocation(), 282 diag::err_param_default_argument_redefinition) 283 << NewParam->getDefaultArgRange(); 284 285 // Look for the function declaration where the default argument was 286 // actually written, which may be a declaration prior to Old. 287 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 288 Older; Older = Older->getPreviousDeclaration()) { 289 if (!Older->getParamDecl(p)->hasDefaultArg()) 290 break; 291 292 OldParam = Older->getParamDecl(p); 293 } 294 295 Diag(OldParam->getLocation(), diag::note_previous_definition) 296 << OldParam->getDefaultArgRange(); 297 Invalid = true; 298 } else if (OldParam->hasDefaultArg()) { 299 // Merge the old default argument into the new parameter. 300 // It's important to use getInit() here; getDefaultArg() 301 // strips off any top-level CXXExprWithTemporaries. 302 NewParam->setHasInheritedDefaultArg(); 303 if (OldParam->hasUninstantiatedDefaultArg()) 304 NewParam->setUninstantiatedDefaultArg( 305 OldParam->getUninstantiatedDefaultArg()); 306 else 307 NewParam->setDefaultArg(OldParam->getInit()); 308 } else if (NewParam->hasDefaultArg()) { 309 if (New->getDescribedFunctionTemplate()) { 310 // Paragraph 4, quoted above, only applies to non-template functions. 311 Diag(NewParam->getLocation(), 312 diag::err_param_default_argument_template_redecl) 313 << NewParam->getDefaultArgRange(); 314 Diag(Old->getLocation(), diag::note_template_prev_declaration) 315 << false; 316 } else if (New->getTemplateSpecializationKind() 317 != TSK_ImplicitInstantiation && 318 New->getTemplateSpecializationKind() != TSK_Undeclared) { 319 // C++ [temp.expr.spec]p21: 320 // Default function arguments shall not be specified in a declaration 321 // or a definition for one of the following explicit specializations: 322 // - the explicit specialization of a function template; 323 // - the explicit specialization of a member function template; 324 // - the explicit specialization of a member function of a class 325 // template where the class template specialization to which the 326 // member function specialization belongs is implicitly 327 // instantiated. 328 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 329 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 330 << New->getDeclName() 331 << NewParam->getDefaultArgRange(); 332 } else if (New->getDeclContext()->isDependentContext()) { 333 // C++ [dcl.fct.default]p6 (DR217): 334 // Default arguments for a member function of a class template shall 335 // be specified on the initial declaration of the member function 336 // within the class template. 337 // 338 // Reading the tea leaves a bit in DR217 and its reference to DR205 339 // leads me to the conclusion that one cannot add default function 340 // arguments for an out-of-line definition of a member function of a 341 // dependent type. 342 int WhichKind = 2; 343 if (CXXRecordDecl *Record 344 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 345 if (Record->getDescribedClassTemplate()) 346 WhichKind = 0; 347 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 348 WhichKind = 1; 349 else 350 WhichKind = 2; 351 } 352 353 Diag(NewParam->getLocation(), 354 diag::err_param_default_argument_member_template_redecl) 355 << WhichKind 356 << NewParam->getDefaultArgRange(); 357 } 358 } 359 } 360 361 if (CheckEquivalentExceptionSpec(Old, New)) 362 Invalid = true; 363 364 return Invalid; 365} 366 367/// CheckCXXDefaultArguments - Verify that the default arguments for a 368/// function declaration are well-formed according to C++ 369/// [dcl.fct.default]. 370void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 371 unsigned NumParams = FD->getNumParams(); 372 unsigned p; 373 374 // Find first parameter with a default argument 375 for (p = 0; p < NumParams; ++p) { 376 ParmVarDecl *Param = FD->getParamDecl(p); 377 if (Param->hasDefaultArg()) 378 break; 379 } 380 381 // C++ [dcl.fct.default]p4: 382 // In a given function declaration, all parameters 383 // subsequent to a parameter with a default argument shall 384 // have default arguments supplied in this or previous 385 // declarations. A default argument shall not be redefined 386 // by a later declaration (not even to the same value). 387 unsigned LastMissingDefaultArg = 0; 388 for (; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (!Param->hasDefaultArg()) { 391 if (Param->isInvalidDecl()) 392 /* We already complained about this parameter. */; 393 else if (Param->getIdentifier()) 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing_name) 396 << Param->getIdentifier(); 397 else 398 Diag(Param->getLocation(), 399 diag::err_param_default_argument_missing); 400 401 LastMissingDefaultArg = p; 402 } 403 } 404 405 if (LastMissingDefaultArg > 0) { 406 // Some default arguments were missing. Clear out all of the 407 // default arguments up to (and including) the last missing 408 // default argument, so that we leave the function parameters 409 // in a semantically valid state. 410 for (p = 0; p <= LastMissingDefaultArg; ++p) { 411 ParmVarDecl *Param = FD->getParamDecl(p); 412 if (Param->hasDefaultArg()) { 413 Param->setDefaultArg(0); 414 } 415 } 416 } 417} 418 419/// isCurrentClassName - Determine whether the identifier II is the 420/// name of the class type currently being defined. In the case of 421/// nested classes, this will only return true if II is the name of 422/// the innermost class. 423bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 424 const CXXScopeSpec *SS) { 425 assert(getLangOptions().CPlusPlus && "No class names in C!"); 426 427 CXXRecordDecl *CurDecl; 428 if (SS && SS->isSet() && !SS->isInvalid()) { 429 DeclContext *DC = computeDeclContext(*SS, true); 430 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 431 } else 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 433 434 if (CurDecl && CurDecl->getIdentifier()) 435 return &II == CurDecl->getIdentifier(); 436 else 437 return false; 438} 439 440/// \brief Check the validity of a C++ base class specifier. 441/// 442/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 443/// and returns NULL otherwise. 444CXXBaseSpecifier * 445Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 446 SourceRange SpecifierRange, 447 bool Virtual, AccessSpecifier Access, 448 TypeSourceInfo *TInfo) { 449 QualType BaseType = TInfo->getType(); 450 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == TTK_Class, 462 Access, TInfo); 463 464 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 465 466 // Base specifiers must be record types. 467 if (!BaseType->isRecordType()) { 468 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.union]p1: 473 // A union shall not be used as a base class. 474 if (BaseType->isUnionType()) { 475 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 476 return 0; 477 } 478 479 // C++ [class.derived]p2: 480 // The class-name in a base-specifier shall not be an incompletely 481 // defined class. 482 if (RequireCompleteType(BaseLoc, BaseType, 483 PDiag(diag::err_incomplete_base_class) 484 << SpecifierRange)) { 485 Class->setInvalidDecl(); 486 return 0; 487 } 488 489 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 490 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 491 assert(BaseDecl && "Record type has no declaration"); 492 BaseDecl = BaseDecl->getDefinition(); 493 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 494 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 495 assert(CXXBaseDecl && "Base type is not a C++ type"); 496 497 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 498 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 499 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 500 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 501 << BaseType; 502 return 0; 503 } 504 505 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 506 507 if (BaseDecl->isInvalidDecl()) 508 Class->setInvalidDecl(); 509 510 // Create the base specifier. 511 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 512 Class->getTagKind() == TTK_Class, 513 Access, TInfo); 514} 515 516void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 517 const CXXRecordDecl *BaseClass, 518 bool BaseIsVirtual) { 519 // C++ [class.virtual]p1: 520 // A class that [...] inherits a virtual function is called a polymorphic 521 // class. 522 if (BaseClass->isPolymorphic()) 523 Class->setPolymorphic(true); 524 525 if (BaseIsVirtual) { 526 // C++ [class.ctor]p5: 527 // A constructor is trivial if its class has no virtual base classes. 528 Class->setHasTrivialConstructor(false); 529 530 // C++ [class.copy]p6: 531 // A copy constructor is trivial if its class has no virtual base classes. 532 Class->setHasTrivialCopyConstructor(false); 533 534 // C++ [class.copy]p11: 535 // A copy assignment operator is trivial if its class has no virtual 536 // base classes. 537 Class->setHasTrivialCopyAssignment(false); 538 } else { 539 // C++ [class.ctor]p5: 540 // A constructor is trivial if all the direct base classes of its 541 // class have trivial constructors. 542 if (!BaseClass->hasTrivialConstructor()) 543 Class->setHasTrivialConstructor(false); 544 545 // C++ [class.copy]p6: 546 // A copy constructor is trivial if all the direct base classes of its 547 // class have trivial copy constructors. 548 if (!BaseClass->hasTrivialCopyConstructor()) 549 Class->setHasTrivialCopyConstructor(false); 550 551 // C++ [class.copy]p11: 552 // A copy assignment operator is trivial if all the direct base classes 553 // of its class have trivial copy assignment operators. 554 if (!BaseClass->hasTrivialCopyAssignment()) 555 Class->setHasTrivialCopyAssignment(false); 556 } 557 558 // C++ [class.ctor]p3: 559 // A destructor is trivial if all the direct base classes of its class 560 // have trivial destructors. 561 if (!BaseClass->hasTrivialDestructor()) 562 Class->setHasTrivialDestructor(false); 563} 564 565/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 566/// one entry in the base class list of a class specifier, for 567/// example: 568/// class foo : public bar, virtual private baz { 569/// 'public bar' and 'virtual private baz' are each base-specifiers. 570BaseResult 571Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 572 bool Virtual, AccessSpecifier Access, 573 ParsedType basetype, SourceLocation BaseLoc) { 574 if (!classdecl) 575 return true; 576 577 AdjustDeclIfTemplate(classdecl); 578 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 579 if (!Class) 580 return true; 581 582 TypeSourceInfo *TInfo = 0; 583 GetTypeFromParser(basetype, &TInfo); 584 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 585 Virtual, Access, TInfo)) 586 return BaseSpec; 587 588 return true; 589} 590 591/// \brief Performs the actual work of attaching the given base class 592/// specifiers to a C++ class. 593bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 594 unsigned NumBases) { 595 if (NumBases == 0) 596 return false; 597 598 // Used to keep track of which base types we have already seen, so 599 // that we can properly diagnose redundant direct base types. Note 600 // that the key is always the unqualified canonical type of the base 601 // class. 602 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 603 604 // Copy non-redundant base specifiers into permanent storage. 605 unsigned NumGoodBases = 0; 606 bool Invalid = false; 607 for (unsigned idx = 0; idx < NumBases; ++idx) { 608 QualType NewBaseType 609 = Context.getCanonicalType(Bases[idx]->getType()); 610 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 611 if (!Class->hasObjectMember()) { 612 if (const RecordType *FDTTy = 613 NewBaseType.getTypePtr()->getAs<RecordType>()) 614 if (FDTTy->getDecl()->hasObjectMember()) 615 Class->setHasObjectMember(true); 616 } 617 618 if (KnownBaseTypes[NewBaseType]) { 619 // C++ [class.mi]p3: 620 // A class shall not be specified as a direct base class of a 621 // derived class more than once. 622 Diag(Bases[idx]->getSourceRange().getBegin(), 623 diag::err_duplicate_base_class) 624 << KnownBaseTypes[NewBaseType]->getType() 625 << Bases[idx]->getSourceRange(); 626 627 // Delete the duplicate base class specifier; we're going to 628 // overwrite its pointer later. 629 Context.Deallocate(Bases[idx]); 630 631 Invalid = true; 632 } else { 633 // Okay, add this new base class. 634 KnownBaseTypes[NewBaseType] = Bases[idx]; 635 Bases[NumGoodBases++] = Bases[idx]; 636 } 637 } 638 639 // Attach the remaining base class specifiers to the derived class. 640 Class->setBases(Bases, NumGoodBases); 641 642 // Delete the remaining (good) base class specifiers, since their 643 // data has been copied into the CXXRecordDecl. 644 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 645 Context.Deallocate(Bases[idx]); 646 647 return Invalid; 648} 649 650/// ActOnBaseSpecifiers - Attach the given base specifiers to the 651/// class, after checking whether there are any duplicate base 652/// classes. 653void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 654 unsigned NumBases) { 655 if (!ClassDecl || !Bases || !NumBases) 656 return; 657 658 AdjustDeclIfTemplate(ClassDecl); 659 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 660 (CXXBaseSpecifier**)(Bases), NumBases); 661} 662 663static CXXRecordDecl *GetClassForType(QualType T) { 664 if (const RecordType *RT = T->getAs<RecordType>()) 665 return cast<CXXRecordDecl>(RT->getDecl()); 666 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 667 return ICT->getDecl(); 668 else 669 return 0; 670} 671 672/// \brief Determine whether the type \p Derived is a C++ class that is 673/// derived from the type \p Base. 674bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 675 if (!getLangOptions().CPlusPlus) 676 return false; 677 678 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 679 if (!DerivedRD) 680 return false; 681 682 CXXRecordDecl *BaseRD = GetClassForType(Base); 683 if (!BaseRD) 684 return false; 685 686 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 687 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 688} 689 690/// \brief Determine whether the type \p Derived is a C++ class that is 691/// derived from the type \p Base. 692bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 693 if (!getLangOptions().CPlusPlus) 694 return false; 695 696 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 697 if (!DerivedRD) 698 return false; 699 700 CXXRecordDecl *BaseRD = GetClassForType(Base); 701 if (!BaseRD) 702 return false; 703 704 return DerivedRD->isDerivedFrom(BaseRD, Paths); 705} 706 707void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 708 CXXCastPath &BasePathArray) { 709 assert(BasePathArray.empty() && "Base path array must be empty!"); 710 assert(Paths.isRecordingPaths() && "Must record paths!"); 711 712 const CXXBasePath &Path = Paths.front(); 713 714 // We first go backward and check if we have a virtual base. 715 // FIXME: It would be better if CXXBasePath had the base specifier for 716 // the nearest virtual base. 717 unsigned Start = 0; 718 for (unsigned I = Path.size(); I != 0; --I) { 719 if (Path[I - 1].Base->isVirtual()) { 720 Start = I - 1; 721 break; 722 } 723 } 724 725 // Now add all bases. 726 for (unsigned I = Start, E = Path.size(); I != E; ++I) 727 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 728} 729 730/// \brief Determine whether the given base path includes a virtual 731/// base class. 732bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 733 for (CXXCastPath::const_iterator B = BasePath.begin(), 734 BEnd = BasePath.end(); 735 B != BEnd; ++B) 736 if ((*B)->isVirtual()) 737 return true; 738 739 return false; 740} 741 742/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 743/// conversion (where Derived and Base are class types) is 744/// well-formed, meaning that the conversion is unambiguous (and 745/// that all of the base classes are accessible). Returns true 746/// and emits a diagnostic if the code is ill-formed, returns false 747/// otherwise. Loc is the location where this routine should point to 748/// if there is an error, and Range is the source range to highlight 749/// if there is an error. 750bool 751Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 752 unsigned InaccessibleBaseID, 753 unsigned AmbigiousBaseConvID, 754 SourceLocation Loc, SourceRange Range, 755 DeclarationName Name, 756 CXXCastPath *BasePath) { 757 // First, determine whether the path from Derived to Base is 758 // ambiguous. This is slightly more expensive than checking whether 759 // the Derived to Base conversion exists, because here we need to 760 // explore multiple paths to determine if there is an ambiguity. 761 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 762 /*DetectVirtual=*/false); 763 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 764 assert(DerivationOkay && 765 "Can only be used with a derived-to-base conversion"); 766 (void)DerivationOkay; 767 768 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 769 if (InaccessibleBaseID) { 770 // Check that the base class can be accessed. 771 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 772 InaccessibleBaseID)) { 773 case AR_inaccessible: 774 return true; 775 case AR_accessible: 776 case AR_dependent: 777 case AR_delayed: 778 break; 779 } 780 } 781 782 // Build a base path if necessary. 783 if (BasePath) 784 BuildBasePathArray(Paths, *BasePath); 785 return false; 786 } 787 788 // We know that the derived-to-base conversion is ambiguous, and 789 // we're going to produce a diagnostic. Perform the derived-to-base 790 // search just one more time to compute all of the possible paths so 791 // that we can print them out. This is more expensive than any of 792 // the previous derived-to-base checks we've done, but at this point 793 // performance isn't as much of an issue. 794 Paths.clear(); 795 Paths.setRecordingPaths(true); 796 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 797 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 798 (void)StillOkay; 799 800 // Build up a textual representation of the ambiguous paths, e.g., 801 // D -> B -> A, that will be used to illustrate the ambiguous 802 // conversions in the diagnostic. We only print one of the paths 803 // to each base class subobject. 804 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 805 806 Diag(Loc, AmbigiousBaseConvID) 807 << Derived << Base << PathDisplayStr << Range << Name; 808 return true; 809} 810 811bool 812Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 813 SourceLocation Loc, SourceRange Range, 814 CXXCastPath *BasePath, 815 bool IgnoreAccess) { 816 return CheckDerivedToBaseConversion(Derived, Base, 817 IgnoreAccess ? 0 818 : diag::err_upcast_to_inaccessible_base, 819 diag::err_ambiguous_derived_to_base_conv, 820 Loc, Range, DeclarationName(), 821 BasePath); 822} 823 824 825/// @brief Builds a string representing ambiguous paths from a 826/// specific derived class to different subobjects of the same base 827/// class. 828/// 829/// This function builds a string that can be used in error messages 830/// to show the different paths that one can take through the 831/// inheritance hierarchy to go from the derived class to different 832/// subobjects of a base class. The result looks something like this: 833/// @code 834/// struct D -> struct B -> struct A 835/// struct D -> struct C -> struct A 836/// @endcode 837std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 838 std::string PathDisplayStr; 839 std::set<unsigned> DisplayedPaths; 840 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 841 Path != Paths.end(); ++Path) { 842 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 843 // We haven't displayed a path to this particular base 844 // class subobject yet. 845 PathDisplayStr += "\n "; 846 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 847 for (CXXBasePath::const_iterator Element = Path->begin(); 848 Element != Path->end(); ++Element) 849 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 850 } 851 } 852 853 return PathDisplayStr; 854} 855 856//===----------------------------------------------------------------------===// 857// C++ class member Handling 858//===----------------------------------------------------------------------===// 859 860/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 861Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 862 SourceLocation ASLoc, 863 SourceLocation ColonLoc) { 864 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 865 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 866 ASLoc, ColonLoc); 867 CurContext->addHiddenDecl(ASDecl); 868 return ASDecl; 869} 870 871/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 872/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 873/// bitfield width if there is one and 'InitExpr' specifies the initializer if 874/// any. 875Decl * 876Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 877 MultiTemplateParamsArg TemplateParameterLists, 878 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 879 bool Deleted) { 880 const DeclSpec &DS = D.getDeclSpec(); 881 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 882 DeclarationName Name = NameInfo.getName(); 883 SourceLocation Loc = NameInfo.getLoc(); 884 Expr *BitWidth = static_cast<Expr*>(BW); 885 Expr *Init = static_cast<Expr*>(InitExpr); 886 887 assert(isa<CXXRecordDecl>(CurContext)); 888 assert(!DS.isFriendSpecified()); 889 890 bool isFunc = false; 891 if (D.isFunctionDeclarator()) 892 isFunc = true; 893 else if (D.getNumTypeObjects() == 0 && 894 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 895 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 896 isFunc = TDType->isFunctionType(); 897 } 898 899 // C++ 9.2p6: A member shall not be declared to have automatic storage 900 // duration (auto, register) or with the extern storage-class-specifier. 901 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 902 // data members and cannot be applied to names declared const or static, 903 // and cannot be applied to reference members. 904 switch (DS.getStorageClassSpec()) { 905 case DeclSpec::SCS_unspecified: 906 case DeclSpec::SCS_typedef: 907 case DeclSpec::SCS_static: 908 // FALL THROUGH. 909 break; 910 case DeclSpec::SCS_mutable: 911 if (isFunc) { 912 if (DS.getStorageClassSpecLoc().isValid()) 913 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 914 else 915 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 916 917 // FIXME: It would be nicer if the keyword was ignored only for this 918 // declarator. Otherwise we could get follow-up errors. 919 D.getMutableDeclSpec().ClearStorageClassSpecs(); 920 } 921 break; 922 default: 923 if (DS.getStorageClassSpecLoc().isValid()) 924 Diag(DS.getStorageClassSpecLoc(), 925 diag::err_storageclass_invalid_for_member); 926 else 927 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 928 D.getMutableDeclSpec().ClearStorageClassSpecs(); 929 } 930 931 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 932 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 933 !isFunc); 934 935 Decl *Member; 936 if (isInstField) { 937 // FIXME: Check for template parameters! 938 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 939 AS); 940 assert(Member && "HandleField never returns null"); 941 } else { 942 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 943 if (!Member) { 944 return 0; 945 } 946 947 // Non-instance-fields can't have a bitfield. 948 if (BitWidth) { 949 if (Member->isInvalidDecl()) { 950 // don't emit another diagnostic. 951 } else if (isa<VarDecl>(Member)) { 952 // C++ 9.6p3: A bit-field shall not be a static member. 953 // "static member 'A' cannot be a bit-field" 954 Diag(Loc, diag::err_static_not_bitfield) 955 << Name << BitWidth->getSourceRange(); 956 } else if (isa<TypedefDecl>(Member)) { 957 // "typedef member 'x' cannot be a bit-field" 958 Diag(Loc, diag::err_typedef_not_bitfield) 959 << Name << BitWidth->getSourceRange(); 960 } else { 961 // A function typedef ("typedef int f(); f a;"). 962 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 963 Diag(Loc, diag::err_not_integral_type_bitfield) 964 << Name << cast<ValueDecl>(Member)->getType() 965 << BitWidth->getSourceRange(); 966 } 967 968 BitWidth = 0; 969 Member->setInvalidDecl(); 970 } 971 972 Member->setAccess(AS); 973 974 // If we have declared a member function template, set the access of the 975 // templated declaration as well. 976 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 977 FunTmpl->getTemplatedDecl()->setAccess(AS); 978 } 979 980 assert((Name || isInstField) && "No identifier for non-field ?"); 981 982 if (Init) 983 AddInitializerToDecl(Member, Init, false); 984 if (Deleted) // FIXME: Source location is not very good. 985 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 986 987 if (isInstField) { 988 FieldCollector->Add(cast<FieldDecl>(Member)); 989 return 0; 990 } 991 return Member; 992} 993 994/// \brief Find the direct and/or virtual base specifiers that 995/// correspond to the given base type, for use in base initialization 996/// within a constructor. 997static bool FindBaseInitializer(Sema &SemaRef, 998 CXXRecordDecl *ClassDecl, 999 QualType BaseType, 1000 const CXXBaseSpecifier *&DirectBaseSpec, 1001 const CXXBaseSpecifier *&VirtualBaseSpec) { 1002 // First, check for a direct base class. 1003 DirectBaseSpec = 0; 1004 for (CXXRecordDecl::base_class_const_iterator Base 1005 = ClassDecl->bases_begin(); 1006 Base != ClassDecl->bases_end(); ++Base) { 1007 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1008 // We found a direct base of this type. That's what we're 1009 // initializing. 1010 DirectBaseSpec = &*Base; 1011 break; 1012 } 1013 } 1014 1015 // Check for a virtual base class. 1016 // FIXME: We might be able to short-circuit this if we know in advance that 1017 // there are no virtual bases. 1018 VirtualBaseSpec = 0; 1019 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1020 // We haven't found a base yet; search the class hierarchy for a 1021 // virtual base class. 1022 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1023 /*DetectVirtual=*/false); 1024 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1025 BaseType, Paths)) { 1026 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1027 Path != Paths.end(); ++Path) { 1028 if (Path->back().Base->isVirtual()) { 1029 VirtualBaseSpec = Path->back().Base; 1030 break; 1031 } 1032 } 1033 } 1034 } 1035 1036 return DirectBaseSpec || VirtualBaseSpec; 1037} 1038 1039/// ActOnMemInitializer - Handle a C++ member initializer. 1040MemInitResult 1041Sema::ActOnMemInitializer(Decl *ConstructorD, 1042 Scope *S, 1043 CXXScopeSpec &SS, 1044 IdentifierInfo *MemberOrBase, 1045 ParsedType TemplateTypeTy, 1046 SourceLocation IdLoc, 1047 SourceLocation LParenLoc, 1048 ExprTy **Args, unsigned NumArgs, 1049 SourceLocation RParenLoc) { 1050 if (!ConstructorD) 1051 return true; 1052 1053 AdjustDeclIfTemplate(ConstructorD); 1054 1055 CXXConstructorDecl *Constructor 1056 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1057 if (!Constructor) { 1058 // The user wrote a constructor initializer on a function that is 1059 // not a C++ constructor. Ignore the error for now, because we may 1060 // have more member initializers coming; we'll diagnose it just 1061 // once in ActOnMemInitializers. 1062 return true; 1063 } 1064 1065 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1066 1067 // C++ [class.base.init]p2: 1068 // Names in a mem-initializer-id are looked up in the scope of the 1069 // constructor’s class and, if not found in that scope, are looked 1070 // up in the scope containing the constructor’s 1071 // definition. [Note: if the constructor’s class contains a member 1072 // with the same name as a direct or virtual base class of the 1073 // class, a mem-initializer-id naming the member or base class and 1074 // composed of a single identifier refers to the class member. A 1075 // mem-initializer-id for the hidden base class may be specified 1076 // using a qualified name. ] 1077 if (!SS.getScopeRep() && !TemplateTypeTy) { 1078 // Look for a member, first. 1079 FieldDecl *Member = 0; 1080 DeclContext::lookup_result Result 1081 = ClassDecl->lookup(MemberOrBase); 1082 if (Result.first != Result.second) 1083 Member = dyn_cast<FieldDecl>(*Result.first); 1084 1085 // FIXME: Handle members of an anonymous union. 1086 1087 if (Member) 1088 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1089 LParenLoc, RParenLoc); 1090 } 1091 // It didn't name a member, so see if it names a class. 1092 QualType BaseType; 1093 TypeSourceInfo *TInfo = 0; 1094 1095 if (TemplateTypeTy) { 1096 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1097 } else { 1098 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1099 LookupParsedName(R, S, &SS); 1100 1101 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1102 if (!TyD) { 1103 if (R.isAmbiguous()) return true; 1104 1105 // We don't want access-control diagnostics here. 1106 R.suppressDiagnostics(); 1107 1108 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1109 bool NotUnknownSpecialization = false; 1110 DeclContext *DC = computeDeclContext(SS, false); 1111 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1112 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1113 1114 if (!NotUnknownSpecialization) { 1115 // When the scope specifier can refer to a member of an unknown 1116 // specialization, we take it as a type name. 1117 BaseType = CheckTypenameType(ETK_None, 1118 (NestedNameSpecifier *)SS.getScopeRep(), 1119 *MemberOrBase, SourceLocation(), 1120 SS.getRange(), IdLoc); 1121 if (BaseType.isNull()) 1122 return true; 1123 1124 R.clear(); 1125 R.setLookupName(MemberOrBase); 1126 } 1127 } 1128 1129 // If no results were found, try to correct typos. 1130 if (R.empty() && BaseType.isNull() && 1131 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1132 R.isSingleResult()) { 1133 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1134 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1135 // We have found a non-static data member with a similar 1136 // name to what was typed; complain and initialize that 1137 // member. 1138 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1139 << MemberOrBase << true << R.getLookupName() 1140 << FixItHint::CreateReplacement(R.getNameLoc(), 1141 R.getLookupName().getAsString()); 1142 Diag(Member->getLocation(), diag::note_previous_decl) 1143 << Member->getDeclName(); 1144 1145 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1146 LParenLoc, RParenLoc); 1147 } 1148 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1149 const CXXBaseSpecifier *DirectBaseSpec; 1150 const CXXBaseSpecifier *VirtualBaseSpec; 1151 if (FindBaseInitializer(*this, ClassDecl, 1152 Context.getTypeDeclType(Type), 1153 DirectBaseSpec, VirtualBaseSpec)) { 1154 // We have found a direct or virtual base class with a 1155 // similar name to what was typed; complain and initialize 1156 // that base class. 1157 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1158 << MemberOrBase << false << R.getLookupName() 1159 << FixItHint::CreateReplacement(R.getNameLoc(), 1160 R.getLookupName().getAsString()); 1161 1162 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1163 : VirtualBaseSpec; 1164 Diag(BaseSpec->getSourceRange().getBegin(), 1165 diag::note_base_class_specified_here) 1166 << BaseSpec->getType() 1167 << BaseSpec->getSourceRange(); 1168 1169 TyD = Type; 1170 } 1171 } 1172 } 1173 1174 if (!TyD && BaseType.isNull()) { 1175 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1176 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1177 return true; 1178 } 1179 } 1180 1181 if (BaseType.isNull()) { 1182 BaseType = Context.getTypeDeclType(TyD); 1183 if (SS.isSet()) { 1184 NestedNameSpecifier *Qualifier = 1185 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1186 1187 // FIXME: preserve source range information 1188 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1189 } 1190 } 1191 } 1192 1193 if (!TInfo) 1194 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1195 1196 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1197 LParenLoc, RParenLoc, ClassDecl); 1198} 1199 1200/// Checks an initializer expression for use of uninitialized fields, such as 1201/// containing the field that is being initialized. Returns true if there is an 1202/// uninitialized field was used an updates the SourceLocation parameter; false 1203/// otherwise. 1204static bool InitExprContainsUninitializedFields(const Stmt *S, 1205 const FieldDecl *LhsField, 1206 SourceLocation *L) { 1207 if (isa<CallExpr>(S)) { 1208 // Do not descend into function calls or constructors, as the use 1209 // of an uninitialized field may be valid. One would have to inspect 1210 // the contents of the function/ctor to determine if it is safe or not. 1211 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1212 // may be safe, depending on what the function/ctor does. 1213 return false; 1214 } 1215 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1216 const NamedDecl *RhsField = ME->getMemberDecl(); 1217 if (RhsField == LhsField) { 1218 // Initializing a field with itself. Throw a warning. 1219 // But wait; there are exceptions! 1220 // Exception #1: The field may not belong to this record. 1221 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1222 const Expr *base = ME->getBase(); 1223 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1224 // Even though the field matches, it does not belong to this record. 1225 return false; 1226 } 1227 // None of the exceptions triggered; return true to indicate an 1228 // uninitialized field was used. 1229 *L = ME->getMemberLoc(); 1230 return true; 1231 } 1232 } else if (isa<SizeOfAlignOfExpr>(S)) { 1233 // sizeof/alignof doesn't reference contents, do not warn. 1234 return false; 1235 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1236 // address-of doesn't reference contents (the pointer may be dereferenced 1237 // in the same expression but it would be rare; and weird). 1238 if (UOE->getOpcode() == UO_AddrOf) 1239 return false; 1240 } 1241 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1242 it != e; ++it) { 1243 if (!*it) { 1244 // An expression such as 'member(arg ?: "")' may trigger this. 1245 continue; 1246 } 1247 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1248 return true; 1249 } 1250 return false; 1251} 1252 1253MemInitResult 1254Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1255 unsigned NumArgs, SourceLocation IdLoc, 1256 SourceLocation LParenLoc, 1257 SourceLocation RParenLoc) { 1258 // Diagnose value-uses of fields to initialize themselves, e.g. 1259 // foo(foo) 1260 // where foo is not also a parameter to the constructor. 1261 // TODO: implement -Wuninitialized and fold this into that framework. 1262 for (unsigned i = 0; i < NumArgs; ++i) { 1263 SourceLocation L; 1264 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1265 // FIXME: Return true in the case when other fields are used before being 1266 // uninitialized. For example, let this field be the i'th field. When 1267 // initializing the i'th field, throw a warning if any of the >= i'th 1268 // fields are used, as they are not yet initialized. 1269 // Right now we are only handling the case where the i'th field uses 1270 // itself in its initializer. 1271 Diag(L, diag::warn_field_is_uninit); 1272 } 1273 } 1274 1275 bool HasDependentArg = false; 1276 for (unsigned i = 0; i < NumArgs; i++) 1277 HasDependentArg |= Args[i]->isTypeDependent(); 1278 1279 if (Member->getType()->isDependentType() || HasDependentArg) { 1280 // Can't check initialization for a member of dependent type or when 1281 // any of the arguments are type-dependent expressions. 1282 Expr *Init 1283 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1284 RParenLoc); 1285 1286 // Erase any temporaries within this evaluation context; we're not 1287 // going to track them in the AST, since we'll be rebuilding the 1288 // ASTs during template instantiation. 1289 ExprTemporaries.erase( 1290 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1291 ExprTemporaries.end()); 1292 1293 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1294 LParenLoc, 1295 Init, 1296 RParenLoc); 1297 1298 } 1299 1300 if (Member->isInvalidDecl()) 1301 return true; 1302 1303 // Initialize the member. 1304 InitializedEntity MemberEntity = 1305 InitializedEntity::InitializeMember(Member, 0); 1306 InitializationKind Kind = 1307 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1308 1309 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1310 1311 ExprResult MemberInit = 1312 InitSeq.Perform(*this, MemberEntity, Kind, 1313 MultiExprArg(*this, Args, NumArgs), 0); 1314 if (MemberInit.isInvalid()) 1315 return true; 1316 1317 // C++0x [class.base.init]p7: 1318 // The initialization of each base and member constitutes a 1319 // full-expression. 1320 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1321 if (MemberInit.isInvalid()) 1322 return true; 1323 1324 // If we are in a dependent context, template instantiation will 1325 // perform this type-checking again. Just save the arguments that we 1326 // received in a ParenListExpr. 1327 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1328 // of the information that we have about the member 1329 // initializer. However, deconstructing the ASTs is a dicey process, 1330 // and this approach is far more likely to get the corner cases right. 1331 if (CurContext->isDependentContext()) { 1332 // Bump the reference count of all of the arguments. 1333 for (unsigned I = 0; I != NumArgs; ++I) 1334 Args[I]->Retain(); 1335 1336 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1337 RParenLoc); 1338 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1339 LParenLoc, 1340 Init, 1341 RParenLoc); 1342 } 1343 1344 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1345 LParenLoc, 1346 MemberInit.get(), 1347 RParenLoc); 1348} 1349 1350MemInitResult 1351Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1352 Expr **Args, unsigned NumArgs, 1353 SourceLocation LParenLoc, SourceLocation RParenLoc, 1354 CXXRecordDecl *ClassDecl) { 1355 bool HasDependentArg = false; 1356 for (unsigned i = 0; i < NumArgs; i++) 1357 HasDependentArg |= Args[i]->isTypeDependent(); 1358 1359 SourceLocation BaseLoc 1360 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1361 1362 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1363 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1364 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1365 1366 // C++ [class.base.init]p2: 1367 // [...] Unless the mem-initializer-id names a nonstatic data 1368 // member of the constructor’s class or a direct or virtual base 1369 // of that class, the mem-initializer is ill-formed. A 1370 // mem-initializer-list can initialize a base class using any 1371 // name that denotes that base class type. 1372 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1373 1374 // Check for direct and virtual base classes. 1375 const CXXBaseSpecifier *DirectBaseSpec = 0; 1376 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1377 if (!Dependent) { 1378 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1379 VirtualBaseSpec); 1380 1381 // C++ [base.class.init]p2: 1382 // Unless the mem-initializer-id names a nonstatic data member of the 1383 // constructor's class or a direct or virtual base of that class, the 1384 // mem-initializer is ill-formed. 1385 if (!DirectBaseSpec && !VirtualBaseSpec) { 1386 // If the class has any dependent bases, then it's possible that 1387 // one of those types will resolve to the same type as 1388 // BaseType. Therefore, just treat this as a dependent base 1389 // class initialization. FIXME: Should we try to check the 1390 // initialization anyway? It seems odd. 1391 if (ClassDecl->hasAnyDependentBases()) 1392 Dependent = true; 1393 else 1394 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1395 << BaseType << Context.getTypeDeclType(ClassDecl) 1396 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1397 } 1398 } 1399 1400 if (Dependent) { 1401 // Can't check initialization for a base of dependent type or when 1402 // any of the arguments are type-dependent expressions. 1403 ExprResult BaseInit 1404 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1405 RParenLoc)); 1406 1407 // Erase any temporaries within this evaluation context; we're not 1408 // going to track them in the AST, since we'll be rebuilding the 1409 // ASTs during template instantiation. 1410 ExprTemporaries.erase( 1411 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1412 ExprTemporaries.end()); 1413 1414 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1415 /*IsVirtual=*/false, 1416 LParenLoc, 1417 BaseInit.takeAs<Expr>(), 1418 RParenLoc); 1419 } 1420 1421 // C++ [base.class.init]p2: 1422 // If a mem-initializer-id is ambiguous because it designates both 1423 // a direct non-virtual base class and an inherited virtual base 1424 // class, the mem-initializer is ill-formed. 1425 if (DirectBaseSpec && VirtualBaseSpec) 1426 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1427 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1428 1429 CXXBaseSpecifier *BaseSpec 1430 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1431 if (!BaseSpec) 1432 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1433 1434 // Initialize the base. 1435 InitializedEntity BaseEntity = 1436 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1437 InitializationKind Kind = 1438 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1439 1440 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1441 1442 ExprResult BaseInit = 1443 InitSeq.Perform(*this, BaseEntity, Kind, 1444 MultiExprArg(*this, Args, NumArgs), 0); 1445 if (BaseInit.isInvalid()) 1446 return true; 1447 1448 // C++0x [class.base.init]p7: 1449 // The initialization of each base and member constitutes a 1450 // full-expression. 1451 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1452 if (BaseInit.isInvalid()) 1453 return true; 1454 1455 // If we are in a dependent context, template instantiation will 1456 // perform this type-checking again. Just save the arguments that we 1457 // received in a ParenListExpr. 1458 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1459 // of the information that we have about the base 1460 // initializer. However, deconstructing the ASTs is a dicey process, 1461 // and this approach is far more likely to get the corner cases right. 1462 if (CurContext->isDependentContext()) { 1463 // Bump the reference count of all of the arguments. 1464 for (unsigned I = 0; I != NumArgs; ++I) 1465 Args[I]->Retain(); 1466 1467 ExprResult Init 1468 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1469 RParenLoc)); 1470 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1471 BaseSpec->isVirtual(), 1472 LParenLoc, 1473 Init.takeAs<Expr>(), 1474 RParenLoc); 1475 } 1476 1477 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1478 BaseSpec->isVirtual(), 1479 LParenLoc, 1480 BaseInit.takeAs<Expr>(), 1481 RParenLoc); 1482} 1483 1484/// ImplicitInitializerKind - How an implicit base or member initializer should 1485/// initialize its base or member. 1486enum ImplicitInitializerKind { 1487 IIK_Default, 1488 IIK_Copy, 1489 IIK_Move 1490}; 1491 1492static bool 1493BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1494 ImplicitInitializerKind ImplicitInitKind, 1495 CXXBaseSpecifier *BaseSpec, 1496 bool IsInheritedVirtualBase, 1497 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1498 InitializedEntity InitEntity 1499 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1500 IsInheritedVirtualBase); 1501 1502 ExprResult BaseInit; 1503 1504 switch (ImplicitInitKind) { 1505 case IIK_Default: { 1506 InitializationKind InitKind 1507 = InitializationKind::CreateDefault(Constructor->getLocation()); 1508 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1509 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1510 MultiExprArg(SemaRef, 0, 0)); 1511 break; 1512 } 1513 1514 case IIK_Copy: { 1515 ParmVarDecl *Param = Constructor->getParamDecl(0); 1516 QualType ParamType = Param->getType().getNonReferenceType(); 1517 1518 Expr *CopyCtorArg = 1519 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1520 Constructor->getLocation(), ParamType, 0); 1521 1522 // Cast to the base class to avoid ambiguities. 1523 QualType ArgTy = 1524 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1525 ParamType.getQualifiers()); 1526 1527 CXXCastPath BasePath; 1528 BasePath.push_back(BaseSpec); 1529 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1530 CK_UncheckedDerivedToBase, 1531 VK_LValue, &BasePath); 1532 1533 InitializationKind InitKind 1534 = InitializationKind::CreateDirect(Constructor->getLocation(), 1535 SourceLocation(), SourceLocation()); 1536 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1537 &CopyCtorArg, 1); 1538 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1539 MultiExprArg(&CopyCtorArg, 1)); 1540 break; 1541 } 1542 1543 case IIK_Move: 1544 assert(false && "Unhandled initializer kind!"); 1545 } 1546 1547 if (BaseInit.isInvalid()) 1548 return true; 1549 1550 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1551 if (BaseInit.isInvalid()) 1552 return true; 1553 1554 CXXBaseInit = 1555 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1556 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1557 SourceLocation()), 1558 BaseSpec->isVirtual(), 1559 SourceLocation(), 1560 BaseInit.takeAs<Expr>(), 1561 SourceLocation()); 1562 1563 return false; 1564} 1565 1566static bool 1567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1568 ImplicitInitializerKind ImplicitInitKind, 1569 FieldDecl *Field, 1570 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1571 if (Field->isInvalidDecl()) 1572 return true; 1573 1574 SourceLocation Loc = Constructor->getLocation(); 1575 1576 if (ImplicitInitKind == IIK_Copy) { 1577 ParmVarDecl *Param = Constructor->getParamDecl(0); 1578 QualType ParamType = Param->getType().getNonReferenceType(); 1579 1580 Expr *MemberExprBase = 1581 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1582 Loc, ParamType, 0); 1583 1584 // Build a reference to this field within the parameter. 1585 CXXScopeSpec SS; 1586 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1587 Sema::LookupMemberName); 1588 MemberLookup.addDecl(Field, AS_public); 1589 MemberLookup.resolveKind(); 1590 ExprResult CopyCtorArg 1591 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1592 ParamType, Loc, 1593 /*IsArrow=*/false, 1594 SS, 1595 /*FirstQualifierInScope=*/0, 1596 MemberLookup, 1597 /*TemplateArgs=*/0); 1598 if (CopyCtorArg.isInvalid()) 1599 return true; 1600 1601 // When the field we are copying is an array, create index variables for 1602 // each dimension of the array. We use these index variables to subscript 1603 // the source array, and other clients (e.g., CodeGen) will perform the 1604 // necessary iteration with these index variables. 1605 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1606 QualType BaseType = Field->getType(); 1607 QualType SizeType = SemaRef.Context.getSizeType(); 1608 while (const ConstantArrayType *Array 1609 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1610 // Create the iteration variable for this array index. 1611 IdentifierInfo *IterationVarName = 0; 1612 { 1613 llvm::SmallString<8> Str; 1614 llvm::raw_svector_ostream OS(Str); 1615 OS << "__i" << IndexVariables.size(); 1616 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1617 } 1618 VarDecl *IterationVar 1619 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1620 IterationVarName, SizeType, 1621 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1622 SC_None, SC_None); 1623 IndexVariables.push_back(IterationVar); 1624 1625 // Create a reference to the iteration variable. 1626 ExprResult IterationVarRef 1627 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1628 assert(!IterationVarRef.isInvalid() && 1629 "Reference to invented variable cannot fail!"); 1630 1631 // Subscript the array with this iteration variable. 1632 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1633 Loc, 1634 IterationVarRef.take(), 1635 Loc); 1636 if (CopyCtorArg.isInvalid()) 1637 return true; 1638 1639 BaseType = Array->getElementType(); 1640 } 1641 1642 // Construct the entity that we will be initializing. For an array, this 1643 // will be first element in the array, which may require several levels 1644 // of array-subscript entities. 1645 llvm::SmallVector<InitializedEntity, 4> Entities; 1646 Entities.reserve(1 + IndexVariables.size()); 1647 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1648 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1649 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1650 0, 1651 Entities.back())); 1652 1653 // Direct-initialize to use the copy constructor. 1654 InitializationKind InitKind = 1655 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1656 1657 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1658 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1659 &CopyCtorArgE, 1); 1660 1661 ExprResult MemberInit 1662 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1663 MultiExprArg(&CopyCtorArgE, 1)); 1664 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1665 if (MemberInit.isInvalid()) 1666 return true; 1667 1668 CXXMemberInit 1669 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1670 MemberInit.takeAs<Expr>(), Loc, 1671 IndexVariables.data(), 1672 IndexVariables.size()); 1673 return false; 1674 } 1675 1676 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1677 1678 QualType FieldBaseElementType = 1679 SemaRef.Context.getBaseElementType(Field->getType()); 1680 1681 if (FieldBaseElementType->isRecordType()) { 1682 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1683 InitializationKind InitKind = 1684 InitializationKind::CreateDefault(Loc); 1685 1686 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1687 ExprResult MemberInit = 1688 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1689 if (MemberInit.isInvalid()) 1690 return true; 1691 1692 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1693 if (MemberInit.isInvalid()) 1694 return true; 1695 1696 CXXMemberInit = 1697 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1698 Field, Loc, Loc, 1699 MemberInit.get(), 1700 Loc); 1701 return false; 1702 } 1703 1704 if (FieldBaseElementType->isReferenceType()) { 1705 SemaRef.Diag(Constructor->getLocation(), 1706 diag::err_uninitialized_member_in_ctor) 1707 << (int)Constructor->isImplicit() 1708 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1709 << 0 << Field->getDeclName(); 1710 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1711 return true; 1712 } 1713 1714 if (FieldBaseElementType.isConstQualified()) { 1715 SemaRef.Diag(Constructor->getLocation(), 1716 diag::err_uninitialized_member_in_ctor) 1717 << (int)Constructor->isImplicit() 1718 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1719 << 1 << Field->getDeclName(); 1720 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1721 return true; 1722 } 1723 1724 // Nothing to initialize. 1725 CXXMemberInit = 0; 1726 return false; 1727} 1728 1729namespace { 1730struct BaseAndFieldInfo { 1731 Sema &S; 1732 CXXConstructorDecl *Ctor; 1733 bool AnyErrorsInInits; 1734 ImplicitInitializerKind IIK; 1735 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1736 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1737 1738 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1739 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1740 // FIXME: Handle implicit move constructors. 1741 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1742 IIK = IIK_Copy; 1743 else 1744 IIK = IIK_Default; 1745 } 1746}; 1747} 1748 1749static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1750 FieldDecl *Top, FieldDecl *Field, 1751 CXXBaseOrMemberInitializer *Init) { 1752 // If the member doesn't need to be initialized, Init will still be null. 1753 if (!Init) 1754 return; 1755 1756 Info.AllToInit.push_back(Init); 1757 if (Field != Top) { 1758 Init->setMember(Top); 1759 Init->setAnonUnionMember(Field); 1760 } 1761} 1762 1763static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1764 FieldDecl *Top, FieldDecl *Field) { 1765 1766 // Overwhelmingly common case: we have a direct initializer for this field. 1767 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1768 RecordFieldInitializer(Info, Top, Field, Init); 1769 return false; 1770 } 1771 1772 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1773 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1774 assert(FieldClassType && "anonymous struct/union without record type"); 1775 CXXRecordDecl *FieldClassDecl 1776 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1777 1778 // Even though union members never have non-trivial default 1779 // constructions in C++03, we still build member initializers for aggregate 1780 // record types which can be union members, and C++0x allows non-trivial 1781 // default constructors for union members, so we ensure that only one 1782 // member is initialized for these. 1783 if (FieldClassDecl->isUnion()) { 1784 // First check for an explicit initializer for one field. 1785 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1786 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1787 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1788 RecordFieldInitializer(Info, Top, *FA, Init); 1789 1790 // Once we've initialized a field of an anonymous union, the union 1791 // field in the class is also initialized, so exit immediately. 1792 return false; 1793 } else if ((*FA)->isAnonymousStructOrUnion()) { 1794 if (CollectFieldInitializer(Info, Top, *FA)) 1795 return true; 1796 } 1797 } 1798 1799 // Fallthrough and construct a default initializer for the union as 1800 // a whole, which can call its default constructor if such a thing exists 1801 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1802 // behavior going forward with C++0x, when anonymous unions there are 1803 // finalized, we should revisit this. 1804 } else { 1805 // For structs, we simply descend through to initialize all members where 1806 // necessary. 1807 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1808 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1809 if (CollectFieldInitializer(Info, Top, *FA)) 1810 return true; 1811 } 1812 } 1813 } 1814 1815 // Don't try to build an implicit initializer if there were semantic 1816 // errors in any of the initializers (and therefore we might be 1817 // missing some that the user actually wrote). 1818 if (Info.AnyErrorsInInits) 1819 return false; 1820 1821 CXXBaseOrMemberInitializer *Init = 0; 1822 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1823 return true; 1824 1825 RecordFieldInitializer(Info, Top, Field, Init); 1826 return false; 1827} 1828 1829bool 1830Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1831 CXXBaseOrMemberInitializer **Initializers, 1832 unsigned NumInitializers, 1833 bool AnyErrors) { 1834 if (Constructor->getDeclContext()->isDependentContext()) { 1835 // Just store the initializers as written, they will be checked during 1836 // instantiation. 1837 if (NumInitializers > 0) { 1838 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1839 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1840 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1841 memcpy(baseOrMemberInitializers, Initializers, 1842 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1843 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1844 } 1845 1846 return false; 1847 } 1848 1849 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1850 1851 // We need to build the initializer AST according to order of construction 1852 // and not what user specified in the Initializers list. 1853 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1854 if (!ClassDecl) 1855 return true; 1856 1857 bool HadError = false; 1858 1859 for (unsigned i = 0; i < NumInitializers; i++) { 1860 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1861 1862 if (Member->isBaseInitializer()) 1863 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1864 else 1865 Info.AllBaseFields[Member->getMember()] = Member; 1866 } 1867 1868 // Keep track of the direct virtual bases. 1869 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1870 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1871 E = ClassDecl->bases_end(); I != E; ++I) { 1872 if (I->isVirtual()) 1873 DirectVBases.insert(I); 1874 } 1875 1876 // Push virtual bases before others. 1877 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1878 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1879 1880 if (CXXBaseOrMemberInitializer *Value 1881 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1882 Info.AllToInit.push_back(Value); 1883 } else if (!AnyErrors) { 1884 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1885 CXXBaseOrMemberInitializer *CXXBaseInit; 1886 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1887 VBase, IsInheritedVirtualBase, 1888 CXXBaseInit)) { 1889 HadError = true; 1890 continue; 1891 } 1892 1893 Info.AllToInit.push_back(CXXBaseInit); 1894 } 1895 } 1896 1897 // Non-virtual bases. 1898 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1899 E = ClassDecl->bases_end(); Base != E; ++Base) { 1900 // Virtuals are in the virtual base list and already constructed. 1901 if (Base->isVirtual()) 1902 continue; 1903 1904 if (CXXBaseOrMemberInitializer *Value 1905 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1906 Info.AllToInit.push_back(Value); 1907 } else if (!AnyErrors) { 1908 CXXBaseOrMemberInitializer *CXXBaseInit; 1909 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1910 Base, /*IsInheritedVirtualBase=*/false, 1911 CXXBaseInit)) { 1912 HadError = true; 1913 continue; 1914 } 1915 1916 Info.AllToInit.push_back(CXXBaseInit); 1917 } 1918 } 1919 1920 // Fields. 1921 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1922 E = ClassDecl->field_end(); Field != E; ++Field) { 1923 if ((*Field)->getType()->isIncompleteArrayType()) { 1924 assert(ClassDecl->hasFlexibleArrayMember() && 1925 "Incomplete array type is not valid"); 1926 continue; 1927 } 1928 if (CollectFieldInitializer(Info, *Field, *Field)) 1929 HadError = true; 1930 } 1931 1932 NumInitializers = Info.AllToInit.size(); 1933 if (NumInitializers > 0) { 1934 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1935 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1936 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1937 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1938 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1939 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1940 1941 // Constructors implicitly reference the base and member 1942 // destructors. 1943 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1944 Constructor->getParent()); 1945 } 1946 1947 return HadError; 1948} 1949 1950static void *GetKeyForTopLevelField(FieldDecl *Field) { 1951 // For anonymous unions, use the class declaration as the key. 1952 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1953 if (RT->getDecl()->isAnonymousStructOrUnion()) 1954 return static_cast<void *>(RT->getDecl()); 1955 } 1956 return static_cast<void *>(Field); 1957} 1958 1959static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1960 return Context.getCanonicalType(BaseType).getTypePtr(); 1961} 1962 1963static void *GetKeyForMember(ASTContext &Context, 1964 CXXBaseOrMemberInitializer *Member, 1965 bool MemberMaybeAnon = false) { 1966 if (!Member->isMemberInitializer()) 1967 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1968 1969 // For fields injected into the class via declaration of an anonymous union, 1970 // use its anonymous union class declaration as the unique key. 1971 FieldDecl *Field = Member->getMember(); 1972 1973 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1974 // data member of the class. Data member used in the initializer list is 1975 // in AnonUnionMember field. 1976 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1977 Field = Member->getAnonUnionMember(); 1978 1979 // If the field is a member of an anonymous struct or union, our key 1980 // is the anonymous record decl that's a direct child of the class. 1981 RecordDecl *RD = Field->getParent(); 1982 if (RD->isAnonymousStructOrUnion()) { 1983 while (true) { 1984 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1985 if (Parent->isAnonymousStructOrUnion()) 1986 RD = Parent; 1987 else 1988 break; 1989 } 1990 1991 return static_cast<void *>(RD); 1992 } 1993 1994 return static_cast<void *>(Field); 1995} 1996 1997static void 1998DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1999 const CXXConstructorDecl *Constructor, 2000 CXXBaseOrMemberInitializer **Inits, 2001 unsigned NumInits) { 2002 if (Constructor->getDeclContext()->isDependentContext()) 2003 return; 2004 2005 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2006 == Diagnostic::Ignored) 2007 return; 2008 2009 // Build the list of bases and members in the order that they'll 2010 // actually be initialized. The explicit initializers should be in 2011 // this same order but may be missing things. 2012 llvm::SmallVector<const void*, 32> IdealInitKeys; 2013 2014 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2015 2016 // 1. Virtual bases. 2017 for (CXXRecordDecl::base_class_const_iterator VBase = 2018 ClassDecl->vbases_begin(), 2019 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2020 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2021 2022 // 2. Non-virtual bases. 2023 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2024 E = ClassDecl->bases_end(); Base != E; ++Base) { 2025 if (Base->isVirtual()) 2026 continue; 2027 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2028 } 2029 2030 // 3. Direct fields. 2031 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2032 E = ClassDecl->field_end(); Field != E; ++Field) 2033 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2034 2035 unsigned NumIdealInits = IdealInitKeys.size(); 2036 unsigned IdealIndex = 0; 2037 2038 CXXBaseOrMemberInitializer *PrevInit = 0; 2039 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2040 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2041 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2042 2043 // Scan forward to try to find this initializer in the idealized 2044 // initializers list. 2045 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2046 if (InitKey == IdealInitKeys[IdealIndex]) 2047 break; 2048 2049 // If we didn't find this initializer, it must be because we 2050 // scanned past it on a previous iteration. That can only 2051 // happen if we're out of order; emit a warning. 2052 if (IdealIndex == NumIdealInits && PrevInit) { 2053 Sema::SemaDiagnosticBuilder D = 2054 SemaRef.Diag(PrevInit->getSourceLocation(), 2055 diag::warn_initializer_out_of_order); 2056 2057 if (PrevInit->isMemberInitializer()) 2058 D << 0 << PrevInit->getMember()->getDeclName(); 2059 else 2060 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2061 2062 if (Init->isMemberInitializer()) 2063 D << 0 << Init->getMember()->getDeclName(); 2064 else 2065 D << 1 << Init->getBaseClassInfo()->getType(); 2066 2067 // Move back to the initializer's location in the ideal list. 2068 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2069 if (InitKey == IdealInitKeys[IdealIndex]) 2070 break; 2071 2072 assert(IdealIndex != NumIdealInits && 2073 "initializer not found in initializer list"); 2074 } 2075 2076 PrevInit = Init; 2077 } 2078} 2079 2080namespace { 2081bool CheckRedundantInit(Sema &S, 2082 CXXBaseOrMemberInitializer *Init, 2083 CXXBaseOrMemberInitializer *&PrevInit) { 2084 if (!PrevInit) { 2085 PrevInit = Init; 2086 return false; 2087 } 2088 2089 if (FieldDecl *Field = Init->getMember()) 2090 S.Diag(Init->getSourceLocation(), 2091 diag::err_multiple_mem_initialization) 2092 << Field->getDeclName() 2093 << Init->getSourceRange(); 2094 else { 2095 Type *BaseClass = Init->getBaseClass(); 2096 assert(BaseClass && "neither field nor base"); 2097 S.Diag(Init->getSourceLocation(), 2098 diag::err_multiple_base_initialization) 2099 << QualType(BaseClass, 0) 2100 << Init->getSourceRange(); 2101 } 2102 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2103 << 0 << PrevInit->getSourceRange(); 2104 2105 return true; 2106} 2107 2108typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2109typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2110 2111bool CheckRedundantUnionInit(Sema &S, 2112 CXXBaseOrMemberInitializer *Init, 2113 RedundantUnionMap &Unions) { 2114 FieldDecl *Field = Init->getMember(); 2115 RecordDecl *Parent = Field->getParent(); 2116 if (!Parent->isAnonymousStructOrUnion()) 2117 return false; 2118 2119 NamedDecl *Child = Field; 2120 do { 2121 if (Parent->isUnion()) { 2122 UnionEntry &En = Unions[Parent]; 2123 if (En.first && En.first != Child) { 2124 S.Diag(Init->getSourceLocation(), 2125 diag::err_multiple_mem_union_initialization) 2126 << Field->getDeclName() 2127 << Init->getSourceRange(); 2128 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2129 << 0 << En.second->getSourceRange(); 2130 return true; 2131 } else if (!En.first) { 2132 En.first = Child; 2133 En.second = Init; 2134 } 2135 } 2136 2137 Child = Parent; 2138 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2139 } while (Parent->isAnonymousStructOrUnion()); 2140 2141 return false; 2142} 2143} 2144 2145/// ActOnMemInitializers - Handle the member initializers for a constructor. 2146void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2147 SourceLocation ColonLoc, 2148 MemInitTy **meminits, unsigned NumMemInits, 2149 bool AnyErrors) { 2150 if (!ConstructorDecl) 2151 return; 2152 2153 AdjustDeclIfTemplate(ConstructorDecl); 2154 2155 CXXConstructorDecl *Constructor 2156 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2157 2158 if (!Constructor) { 2159 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2160 return; 2161 } 2162 2163 CXXBaseOrMemberInitializer **MemInits = 2164 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2165 2166 // Mapping for the duplicate initializers check. 2167 // For member initializers, this is keyed with a FieldDecl*. 2168 // For base initializers, this is keyed with a Type*. 2169 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2170 2171 // Mapping for the inconsistent anonymous-union initializers check. 2172 RedundantUnionMap MemberUnions; 2173 2174 bool HadError = false; 2175 for (unsigned i = 0; i < NumMemInits; i++) { 2176 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2177 2178 // Set the source order index. 2179 Init->setSourceOrder(i); 2180 2181 if (Init->isMemberInitializer()) { 2182 FieldDecl *Field = Init->getMember(); 2183 if (CheckRedundantInit(*this, Init, Members[Field]) || 2184 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2185 HadError = true; 2186 } else { 2187 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2188 if (CheckRedundantInit(*this, Init, Members[Key])) 2189 HadError = true; 2190 } 2191 } 2192 2193 if (HadError) 2194 return; 2195 2196 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2197 2198 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2199} 2200 2201void 2202Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2203 CXXRecordDecl *ClassDecl) { 2204 // Ignore dependent contexts. 2205 if (ClassDecl->isDependentContext()) 2206 return; 2207 2208 // FIXME: all the access-control diagnostics are positioned on the 2209 // field/base declaration. That's probably good; that said, the 2210 // user might reasonably want to know why the destructor is being 2211 // emitted, and we currently don't say. 2212 2213 // Non-static data members. 2214 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2215 E = ClassDecl->field_end(); I != E; ++I) { 2216 FieldDecl *Field = *I; 2217 if (Field->isInvalidDecl()) 2218 continue; 2219 QualType FieldType = Context.getBaseElementType(Field->getType()); 2220 2221 const RecordType* RT = FieldType->getAs<RecordType>(); 2222 if (!RT) 2223 continue; 2224 2225 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2226 if (FieldClassDecl->hasTrivialDestructor()) 2227 continue; 2228 2229 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2230 CheckDestructorAccess(Field->getLocation(), Dtor, 2231 PDiag(diag::err_access_dtor_field) 2232 << Field->getDeclName() 2233 << FieldType); 2234 2235 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2236 } 2237 2238 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2239 2240 // Bases. 2241 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2242 E = ClassDecl->bases_end(); Base != E; ++Base) { 2243 // Bases are always records in a well-formed non-dependent class. 2244 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2245 2246 // Remember direct virtual bases. 2247 if (Base->isVirtual()) 2248 DirectVirtualBases.insert(RT); 2249 2250 // Ignore trivial destructors. 2251 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2252 if (BaseClassDecl->hasTrivialDestructor()) 2253 continue; 2254 2255 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2256 2257 // FIXME: caret should be on the start of the class name 2258 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2259 PDiag(diag::err_access_dtor_base) 2260 << Base->getType() 2261 << Base->getSourceRange()); 2262 2263 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2264 } 2265 2266 // Virtual bases. 2267 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2268 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2269 2270 // Bases are always records in a well-formed non-dependent class. 2271 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2272 2273 // Ignore direct virtual bases. 2274 if (DirectVirtualBases.count(RT)) 2275 continue; 2276 2277 // Ignore trivial destructors. 2278 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2279 if (BaseClassDecl->hasTrivialDestructor()) 2280 continue; 2281 2282 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2283 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2284 PDiag(diag::err_access_dtor_vbase) 2285 << VBase->getType()); 2286 2287 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2288 } 2289} 2290 2291void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2292 if (!CDtorDecl) 2293 return; 2294 2295 if (CXXConstructorDecl *Constructor 2296 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2297 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2298} 2299 2300bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2301 unsigned DiagID, AbstractDiagSelID SelID) { 2302 if (SelID == -1) 2303 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2304 else 2305 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2306} 2307 2308bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2309 const PartialDiagnostic &PD) { 2310 if (!getLangOptions().CPlusPlus) 2311 return false; 2312 2313 if (const ArrayType *AT = Context.getAsArrayType(T)) 2314 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2315 2316 if (const PointerType *PT = T->getAs<PointerType>()) { 2317 // Find the innermost pointer type. 2318 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2319 PT = T; 2320 2321 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2322 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2323 } 2324 2325 const RecordType *RT = T->getAs<RecordType>(); 2326 if (!RT) 2327 return false; 2328 2329 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2330 2331 // We can't answer whether something is abstract until it has a 2332 // definition. If it's currently being defined, we'll walk back 2333 // over all the declarations when we have a full definition. 2334 const CXXRecordDecl *Def = RD->getDefinition(); 2335 if (!Def || Def->isBeingDefined()) 2336 return false; 2337 2338 if (!RD->isAbstract()) 2339 return false; 2340 2341 Diag(Loc, PD) << RD->getDeclName(); 2342 DiagnoseAbstractType(RD); 2343 2344 return true; 2345} 2346 2347void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2348 // Check if we've already emitted the list of pure virtual functions 2349 // for this class. 2350 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2351 return; 2352 2353 CXXFinalOverriderMap FinalOverriders; 2354 RD->getFinalOverriders(FinalOverriders); 2355 2356 // Keep a set of seen pure methods so we won't diagnose the same method 2357 // more than once. 2358 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2359 2360 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2361 MEnd = FinalOverriders.end(); 2362 M != MEnd; 2363 ++M) { 2364 for (OverridingMethods::iterator SO = M->second.begin(), 2365 SOEnd = M->second.end(); 2366 SO != SOEnd; ++SO) { 2367 // C++ [class.abstract]p4: 2368 // A class is abstract if it contains or inherits at least one 2369 // pure virtual function for which the final overrider is pure 2370 // virtual. 2371 2372 // 2373 if (SO->second.size() != 1) 2374 continue; 2375 2376 if (!SO->second.front().Method->isPure()) 2377 continue; 2378 2379 if (!SeenPureMethods.insert(SO->second.front().Method)) 2380 continue; 2381 2382 Diag(SO->second.front().Method->getLocation(), 2383 diag::note_pure_virtual_function) 2384 << SO->second.front().Method->getDeclName(); 2385 } 2386 } 2387 2388 if (!PureVirtualClassDiagSet) 2389 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2390 PureVirtualClassDiagSet->insert(RD); 2391} 2392 2393namespace { 2394struct AbstractUsageInfo { 2395 Sema &S; 2396 CXXRecordDecl *Record; 2397 CanQualType AbstractType; 2398 bool Invalid; 2399 2400 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2401 : S(S), Record(Record), 2402 AbstractType(S.Context.getCanonicalType( 2403 S.Context.getTypeDeclType(Record))), 2404 Invalid(false) {} 2405 2406 void DiagnoseAbstractType() { 2407 if (Invalid) return; 2408 S.DiagnoseAbstractType(Record); 2409 Invalid = true; 2410 } 2411 2412 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2413}; 2414 2415struct CheckAbstractUsage { 2416 AbstractUsageInfo &Info; 2417 const NamedDecl *Ctx; 2418 2419 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2420 : Info(Info), Ctx(Ctx) {} 2421 2422 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2423 switch (TL.getTypeLocClass()) { 2424#define ABSTRACT_TYPELOC(CLASS, PARENT) 2425#define TYPELOC(CLASS, PARENT) \ 2426 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2427#include "clang/AST/TypeLocNodes.def" 2428 } 2429 } 2430 2431 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2432 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2433 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2434 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2435 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2436 } 2437 } 2438 2439 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2440 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2441 } 2442 2443 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2444 // Visit the type parameters from a permissive context. 2445 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2446 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2447 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2448 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2449 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2450 // TODO: other template argument types? 2451 } 2452 } 2453 2454 // Visit pointee types from a permissive context. 2455#define CheckPolymorphic(Type) \ 2456 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2457 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2458 } 2459 CheckPolymorphic(PointerTypeLoc) 2460 CheckPolymorphic(ReferenceTypeLoc) 2461 CheckPolymorphic(MemberPointerTypeLoc) 2462 CheckPolymorphic(BlockPointerTypeLoc) 2463 2464 /// Handle all the types we haven't given a more specific 2465 /// implementation for above. 2466 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2467 // Every other kind of type that we haven't called out already 2468 // that has an inner type is either (1) sugar or (2) contains that 2469 // inner type in some way as a subobject. 2470 if (TypeLoc Next = TL.getNextTypeLoc()) 2471 return Visit(Next, Sel); 2472 2473 // If there's no inner type and we're in a permissive context, 2474 // don't diagnose. 2475 if (Sel == Sema::AbstractNone) return; 2476 2477 // Check whether the type matches the abstract type. 2478 QualType T = TL.getType(); 2479 if (T->isArrayType()) { 2480 Sel = Sema::AbstractArrayType; 2481 T = Info.S.Context.getBaseElementType(T); 2482 } 2483 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2484 if (CT != Info.AbstractType) return; 2485 2486 // It matched; do some magic. 2487 if (Sel == Sema::AbstractArrayType) { 2488 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2489 << T << TL.getSourceRange(); 2490 } else { 2491 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2492 << Sel << T << TL.getSourceRange(); 2493 } 2494 Info.DiagnoseAbstractType(); 2495 } 2496}; 2497 2498void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2499 Sema::AbstractDiagSelID Sel) { 2500 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2501} 2502 2503} 2504 2505/// Check for invalid uses of an abstract type in a method declaration. 2506static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2507 CXXMethodDecl *MD) { 2508 // No need to do the check on definitions, which require that 2509 // the return/param types be complete. 2510 if (MD->isThisDeclarationADefinition()) 2511 return; 2512 2513 // For safety's sake, just ignore it if we don't have type source 2514 // information. This should never happen for non-implicit methods, 2515 // but... 2516 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2517 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2518} 2519 2520/// Check for invalid uses of an abstract type within a class definition. 2521static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2522 CXXRecordDecl *RD) { 2523 for (CXXRecordDecl::decl_iterator 2524 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2525 Decl *D = *I; 2526 if (D->isImplicit()) continue; 2527 2528 // Methods and method templates. 2529 if (isa<CXXMethodDecl>(D)) { 2530 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2531 } else if (isa<FunctionTemplateDecl>(D)) { 2532 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2533 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2534 2535 // Fields and static variables. 2536 } else if (isa<FieldDecl>(D)) { 2537 FieldDecl *FD = cast<FieldDecl>(D); 2538 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2539 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2540 } else if (isa<VarDecl>(D)) { 2541 VarDecl *VD = cast<VarDecl>(D); 2542 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2543 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2544 2545 // Nested classes and class templates. 2546 } else if (isa<CXXRecordDecl>(D)) { 2547 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2548 } else if (isa<ClassTemplateDecl>(D)) { 2549 CheckAbstractClassUsage(Info, 2550 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2551 } 2552 } 2553} 2554 2555/// \brief Perform semantic checks on a class definition that has been 2556/// completing, introducing implicitly-declared members, checking for 2557/// abstract types, etc. 2558void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2559 if (!Record || Record->isInvalidDecl()) 2560 return; 2561 2562 if (!Record->isDependentType()) 2563 AddImplicitlyDeclaredMembersToClass(Record); 2564 2565 if (Record->isInvalidDecl()) 2566 return; 2567 2568 // Set access bits correctly on the directly-declared conversions. 2569 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2570 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2571 Convs->setAccess(I, (*I)->getAccess()); 2572 2573 // Determine whether we need to check for final overriders. We do 2574 // this either when there are virtual base classes (in which case we 2575 // may end up finding multiple final overriders for a given virtual 2576 // function) or any of the base classes is abstract (in which case 2577 // we might detect that this class is abstract). 2578 bool CheckFinalOverriders = false; 2579 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2580 !Record->isDependentType()) { 2581 if (Record->getNumVBases()) 2582 CheckFinalOverriders = true; 2583 else if (!Record->isAbstract()) { 2584 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2585 BEnd = Record->bases_end(); 2586 B != BEnd; ++B) { 2587 CXXRecordDecl *BaseDecl 2588 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2589 if (BaseDecl->isAbstract()) { 2590 CheckFinalOverriders = true; 2591 break; 2592 } 2593 } 2594 } 2595 } 2596 2597 if (CheckFinalOverriders) { 2598 CXXFinalOverriderMap FinalOverriders; 2599 Record->getFinalOverriders(FinalOverriders); 2600 2601 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2602 MEnd = FinalOverriders.end(); 2603 M != MEnd; ++M) { 2604 for (OverridingMethods::iterator SO = M->second.begin(), 2605 SOEnd = M->second.end(); 2606 SO != SOEnd; ++SO) { 2607 assert(SO->second.size() > 0 && 2608 "All virtual functions have overridding virtual functions"); 2609 if (SO->second.size() == 1) { 2610 // C++ [class.abstract]p4: 2611 // A class is abstract if it contains or inherits at least one 2612 // pure virtual function for which the final overrider is pure 2613 // virtual. 2614 if (SO->second.front().Method->isPure()) 2615 Record->setAbstract(true); 2616 continue; 2617 } 2618 2619 // C++ [class.virtual]p2: 2620 // In a derived class, if a virtual member function of a base 2621 // class subobject has more than one final overrider the 2622 // program is ill-formed. 2623 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2624 << (NamedDecl *)M->first << Record; 2625 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2626 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2627 OMEnd = SO->second.end(); 2628 OM != OMEnd; ++OM) 2629 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2630 << (NamedDecl *)M->first << OM->Method->getParent(); 2631 2632 Record->setInvalidDecl(); 2633 } 2634 } 2635 } 2636 2637 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2638 AbstractUsageInfo Info(*this, Record); 2639 CheckAbstractClassUsage(Info, Record); 2640 } 2641 2642 // If this is not an aggregate type and has no user-declared constructor, 2643 // complain about any non-static data members of reference or const scalar 2644 // type, since they will never get initializers. 2645 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2646 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2647 bool Complained = false; 2648 for (RecordDecl::field_iterator F = Record->field_begin(), 2649 FEnd = Record->field_end(); 2650 F != FEnd; ++F) { 2651 if (F->getType()->isReferenceType() || 2652 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2653 if (!Complained) { 2654 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2655 << Record->getTagKind() << Record; 2656 Complained = true; 2657 } 2658 2659 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2660 << F->getType()->isReferenceType() 2661 << F->getDeclName(); 2662 } 2663 } 2664 } 2665 2666 if (Record->isDynamicClass()) 2667 DynamicClasses.push_back(Record); 2668} 2669 2670void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2671 Decl *TagDecl, 2672 SourceLocation LBrac, 2673 SourceLocation RBrac, 2674 AttributeList *AttrList) { 2675 if (!TagDecl) 2676 return; 2677 2678 AdjustDeclIfTemplate(TagDecl); 2679 2680 ActOnFields(S, RLoc, TagDecl, 2681 // strict aliasing violation! 2682 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2683 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2684 2685 CheckCompletedCXXClass( 2686 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2687} 2688 2689namespace { 2690 /// \brief Helper class that collects exception specifications for 2691 /// implicitly-declared special member functions. 2692 class ImplicitExceptionSpecification { 2693 ASTContext &Context; 2694 bool AllowsAllExceptions; 2695 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2696 llvm::SmallVector<QualType, 4> Exceptions; 2697 2698 public: 2699 explicit ImplicitExceptionSpecification(ASTContext &Context) 2700 : Context(Context), AllowsAllExceptions(false) { } 2701 2702 /// \brief Whether the special member function should have any 2703 /// exception specification at all. 2704 bool hasExceptionSpecification() const { 2705 return !AllowsAllExceptions; 2706 } 2707 2708 /// \brief Whether the special member function should have a 2709 /// throw(...) exception specification (a Microsoft extension). 2710 bool hasAnyExceptionSpecification() const { 2711 return false; 2712 } 2713 2714 /// \brief The number of exceptions in the exception specification. 2715 unsigned size() const { return Exceptions.size(); } 2716 2717 /// \brief The set of exceptions in the exception specification. 2718 const QualType *data() const { return Exceptions.data(); } 2719 2720 /// \brief Note that 2721 void CalledDecl(CXXMethodDecl *Method) { 2722 // If we already know that we allow all exceptions, do nothing. 2723 if (AllowsAllExceptions || !Method) 2724 return; 2725 2726 const FunctionProtoType *Proto 2727 = Method->getType()->getAs<FunctionProtoType>(); 2728 2729 // If this function can throw any exceptions, make a note of that. 2730 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2731 AllowsAllExceptions = true; 2732 ExceptionsSeen.clear(); 2733 Exceptions.clear(); 2734 return; 2735 } 2736 2737 // Record the exceptions in this function's exception specification. 2738 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2739 EEnd = Proto->exception_end(); 2740 E != EEnd; ++E) 2741 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2742 Exceptions.push_back(*E); 2743 } 2744 }; 2745} 2746 2747 2748/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2749/// special functions, such as the default constructor, copy 2750/// constructor, or destructor, to the given C++ class (C++ 2751/// [special]p1). This routine can only be executed just before the 2752/// definition of the class is complete. 2753void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2754 if (!ClassDecl->hasUserDeclaredConstructor()) 2755 ++ASTContext::NumImplicitDefaultConstructors; 2756 2757 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2758 ++ASTContext::NumImplicitCopyConstructors; 2759 2760 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2761 ++ASTContext::NumImplicitCopyAssignmentOperators; 2762 2763 // If we have a dynamic class, then the copy assignment operator may be 2764 // virtual, so we have to declare it immediately. This ensures that, e.g., 2765 // it shows up in the right place in the vtable and that we diagnose 2766 // problems with the implicit exception specification. 2767 if (ClassDecl->isDynamicClass()) 2768 DeclareImplicitCopyAssignment(ClassDecl); 2769 } 2770 2771 if (!ClassDecl->hasUserDeclaredDestructor()) { 2772 ++ASTContext::NumImplicitDestructors; 2773 2774 // If we have a dynamic class, then the destructor may be virtual, so we 2775 // have to declare the destructor immediately. This ensures that, e.g., it 2776 // shows up in the right place in the vtable and that we diagnose problems 2777 // with the implicit exception specification. 2778 if (ClassDecl->isDynamicClass()) 2779 DeclareImplicitDestructor(ClassDecl); 2780 } 2781} 2782 2783void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2784 if (!D) 2785 return; 2786 2787 TemplateParameterList *Params = 0; 2788 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2789 Params = Template->getTemplateParameters(); 2790 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2791 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2792 Params = PartialSpec->getTemplateParameters(); 2793 else 2794 return; 2795 2796 for (TemplateParameterList::iterator Param = Params->begin(), 2797 ParamEnd = Params->end(); 2798 Param != ParamEnd; ++Param) { 2799 NamedDecl *Named = cast<NamedDecl>(*Param); 2800 if (Named->getDeclName()) { 2801 S->AddDecl(Named); 2802 IdResolver.AddDecl(Named); 2803 } 2804 } 2805} 2806 2807void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2808 if (!RecordD) return; 2809 AdjustDeclIfTemplate(RecordD); 2810 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2811 PushDeclContext(S, Record); 2812} 2813 2814void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2815 if (!RecordD) return; 2816 PopDeclContext(); 2817} 2818 2819/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2820/// parsing a top-level (non-nested) C++ class, and we are now 2821/// parsing those parts of the given Method declaration that could 2822/// not be parsed earlier (C++ [class.mem]p2), such as default 2823/// arguments. This action should enter the scope of the given 2824/// Method declaration as if we had just parsed the qualified method 2825/// name. However, it should not bring the parameters into scope; 2826/// that will be performed by ActOnDelayedCXXMethodParameter. 2827void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2828} 2829 2830/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2831/// C++ method declaration. We're (re-)introducing the given 2832/// function parameter into scope for use in parsing later parts of 2833/// the method declaration. For example, we could see an 2834/// ActOnParamDefaultArgument event for this parameter. 2835void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2836 if (!ParamD) 2837 return; 2838 2839 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2840 2841 // If this parameter has an unparsed default argument, clear it out 2842 // to make way for the parsed default argument. 2843 if (Param->hasUnparsedDefaultArg()) 2844 Param->setDefaultArg(0); 2845 2846 S->AddDecl(Param); 2847 if (Param->getDeclName()) 2848 IdResolver.AddDecl(Param); 2849} 2850 2851/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2852/// processing the delayed method declaration for Method. The method 2853/// declaration is now considered finished. There may be a separate 2854/// ActOnStartOfFunctionDef action later (not necessarily 2855/// immediately!) for this method, if it was also defined inside the 2856/// class body. 2857void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2858 if (!MethodD) 2859 return; 2860 2861 AdjustDeclIfTemplate(MethodD); 2862 2863 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2864 2865 // Now that we have our default arguments, check the constructor 2866 // again. It could produce additional diagnostics or affect whether 2867 // the class has implicitly-declared destructors, among other 2868 // things. 2869 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2870 CheckConstructor(Constructor); 2871 2872 // Check the default arguments, which we may have added. 2873 if (!Method->isInvalidDecl()) 2874 CheckCXXDefaultArguments(Method); 2875} 2876 2877/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2878/// the well-formedness of the constructor declarator @p D with type @p 2879/// R. If there are any errors in the declarator, this routine will 2880/// emit diagnostics and set the invalid bit to true. In any case, the type 2881/// will be updated to reflect a well-formed type for the constructor and 2882/// returned. 2883QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2884 StorageClass &SC) { 2885 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2886 2887 // C++ [class.ctor]p3: 2888 // A constructor shall not be virtual (10.3) or static (9.4). A 2889 // constructor can be invoked for a const, volatile or const 2890 // volatile object. A constructor shall not be declared const, 2891 // volatile, or const volatile (9.3.2). 2892 if (isVirtual) { 2893 if (!D.isInvalidType()) 2894 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2895 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2896 << SourceRange(D.getIdentifierLoc()); 2897 D.setInvalidType(); 2898 } 2899 if (SC == SC_Static) { 2900 if (!D.isInvalidType()) 2901 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2902 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2903 << SourceRange(D.getIdentifierLoc()); 2904 D.setInvalidType(); 2905 SC = SC_None; 2906 } 2907 2908 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2909 if (FTI.TypeQuals != 0) { 2910 if (FTI.TypeQuals & Qualifiers::Const) 2911 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2912 << "const" << SourceRange(D.getIdentifierLoc()); 2913 if (FTI.TypeQuals & Qualifiers::Volatile) 2914 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2915 << "volatile" << SourceRange(D.getIdentifierLoc()); 2916 if (FTI.TypeQuals & Qualifiers::Restrict) 2917 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2918 << "restrict" << SourceRange(D.getIdentifierLoc()); 2919 } 2920 2921 // Rebuild the function type "R" without any type qualifiers (in 2922 // case any of the errors above fired) and with "void" as the 2923 // return type, since constructors don't have return types. 2924 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2925 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2926 Proto->getNumArgs(), 2927 Proto->isVariadic(), 0, 2928 Proto->hasExceptionSpec(), 2929 Proto->hasAnyExceptionSpec(), 2930 Proto->getNumExceptions(), 2931 Proto->exception_begin(), 2932 Proto->getExtInfo()); 2933} 2934 2935/// CheckConstructor - Checks a fully-formed constructor for 2936/// well-formedness, issuing any diagnostics required. Returns true if 2937/// the constructor declarator is invalid. 2938void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2939 CXXRecordDecl *ClassDecl 2940 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2941 if (!ClassDecl) 2942 return Constructor->setInvalidDecl(); 2943 2944 // C++ [class.copy]p3: 2945 // A declaration of a constructor for a class X is ill-formed if 2946 // its first parameter is of type (optionally cv-qualified) X and 2947 // either there are no other parameters or else all other 2948 // parameters have default arguments. 2949 if (!Constructor->isInvalidDecl() && 2950 ((Constructor->getNumParams() == 1) || 2951 (Constructor->getNumParams() > 1 && 2952 Constructor->getParamDecl(1)->hasDefaultArg())) && 2953 Constructor->getTemplateSpecializationKind() 2954 != TSK_ImplicitInstantiation) { 2955 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2956 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2957 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2958 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2959 const char *ConstRef 2960 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2961 : " const &"; 2962 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2963 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2964 2965 // FIXME: Rather that making the constructor invalid, we should endeavor 2966 // to fix the type. 2967 Constructor->setInvalidDecl(); 2968 } 2969 } 2970} 2971 2972/// CheckDestructor - Checks a fully-formed destructor definition for 2973/// well-formedness, issuing any diagnostics required. Returns true 2974/// on error. 2975bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2976 CXXRecordDecl *RD = Destructor->getParent(); 2977 2978 if (Destructor->isVirtual()) { 2979 SourceLocation Loc; 2980 2981 if (!Destructor->isImplicit()) 2982 Loc = Destructor->getLocation(); 2983 else 2984 Loc = RD->getLocation(); 2985 2986 // If we have a virtual destructor, look up the deallocation function 2987 FunctionDecl *OperatorDelete = 0; 2988 DeclarationName Name = 2989 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2990 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2991 return true; 2992 2993 MarkDeclarationReferenced(Loc, OperatorDelete); 2994 2995 Destructor->setOperatorDelete(OperatorDelete); 2996 } 2997 2998 return false; 2999} 3000 3001static inline bool 3002FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3003 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3004 FTI.ArgInfo[0].Param && 3005 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3006} 3007 3008/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3009/// the well-formednes of the destructor declarator @p D with type @p 3010/// R. If there are any errors in the declarator, this routine will 3011/// emit diagnostics and set the declarator to invalid. Even if this happens, 3012/// will be updated to reflect a well-formed type for the destructor and 3013/// returned. 3014QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3015 StorageClass& SC) { 3016 // C++ [class.dtor]p1: 3017 // [...] A typedef-name that names a class is a class-name 3018 // (7.1.3); however, a typedef-name that names a class shall not 3019 // be used as the identifier in the declarator for a destructor 3020 // declaration. 3021 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3022 if (isa<TypedefType>(DeclaratorType)) 3023 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3024 << DeclaratorType; 3025 3026 // C++ [class.dtor]p2: 3027 // A destructor is used to destroy objects of its class type. A 3028 // destructor takes no parameters, and no return type can be 3029 // specified for it (not even void). The address of a destructor 3030 // shall not be taken. A destructor shall not be static. A 3031 // destructor can be invoked for a const, volatile or const 3032 // volatile object. A destructor shall not be declared const, 3033 // volatile or const volatile (9.3.2). 3034 if (SC == SC_Static) { 3035 if (!D.isInvalidType()) 3036 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3037 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3038 << SourceRange(D.getIdentifierLoc()) 3039 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3040 3041 SC = SC_None; 3042 } 3043 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3044 // Destructors don't have return types, but the parser will 3045 // happily parse something like: 3046 // 3047 // class X { 3048 // float ~X(); 3049 // }; 3050 // 3051 // The return type will be eliminated later. 3052 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3053 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3054 << SourceRange(D.getIdentifierLoc()); 3055 } 3056 3057 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3058 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3059 if (FTI.TypeQuals & Qualifiers::Const) 3060 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3061 << "const" << SourceRange(D.getIdentifierLoc()); 3062 if (FTI.TypeQuals & Qualifiers::Volatile) 3063 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3064 << "volatile" << SourceRange(D.getIdentifierLoc()); 3065 if (FTI.TypeQuals & Qualifiers::Restrict) 3066 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3067 << "restrict" << SourceRange(D.getIdentifierLoc()); 3068 D.setInvalidType(); 3069 } 3070 3071 // Make sure we don't have any parameters. 3072 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3073 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3074 3075 // Delete the parameters. 3076 FTI.freeArgs(); 3077 D.setInvalidType(); 3078 } 3079 3080 // Make sure the destructor isn't variadic. 3081 if (FTI.isVariadic) { 3082 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3083 D.setInvalidType(); 3084 } 3085 3086 // Rebuild the function type "R" without any type qualifiers or 3087 // parameters (in case any of the errors above fired) and with 3088 // "void" as the return type, since destructors don't have return 3089 // types. 3090 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3091 if (!Proto) 3092 return QualType(); 3093 3094 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3095 Proto->hasExceptionSpec(), 3096 Proto->hasAnyExceptionSpec(), 3097 Proto->getNumExceptions(), 3098 Proto->exception_begin(), 3099 Proto->getExtInfo()); 3100} 3101 3102/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3103/// well-formednes of the conversion function declarator @p D with 3104/// type @p R. If there are any errors in the declarator, this routine 3105/// will emit diagnostics and return true. Otherwise, it will return 3106/// false. Either way, the type @p R will be updated to reflect a 3107/// well-formed type for the conversion operator. 3108void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3109 StorageClass& SC) { 3110 // C++ [class.conv.fct]p1: 3111 // Neither parameter types nor return type can be specified. The 3112 // type of a conversion function (8.3.5) is "function taking no 3113 // parameter returning conversion-type-id." 3114 if (SC == SC_Static) { 3115 if (!D.isInvalidType()) 3116 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3117 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3118 << SourceRange(D.getIdentifierLoc()); 3119 D.setInvalidType(); 3120 SC = SC_None; 3121 } 3122 3123 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3124 3125 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3126 // Conversion functions don't have return types, but the parser will 3127 // happily parse something like: 3128 // 3129 // class X { 3130 // float operator bool(); 3131 // }; 3132 // 3133 // The return type will be changed later anyway. 3134 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3135 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3136 << SourceRange(D.getIdentifierLoc()); 3137 D.setInvalidType(); 3138 } 3139 3140 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3141 3142 // Make sure we don't have any parameters. 3143 if (Proto->getNumArgs() > 0) { 3144 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3145 3146 // Delete the parameters. 3147 D.getTypeObject(0).Fun.freeArgs(); 3148 D.setInvalidType(); 3149 } else if (Proto->isVariadic()) { 3150 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3151 D.setInvalidType(); 3152 } 3153 3154 // Diagnose "&operator bool()" and other such nonsense. This 3155 // is actually a gcc extension which we don't support. 3156 if (Proto->getResultType() != ConvType) { 3157 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3158 << Proto->getResultType(); 3159 D.setInvalidType(); 3160 ConvType = Proto->getResultType(); 3161 } 3162 3163 // C++ [class.conv.fct]p4: 3164 // The conversion-type-id shall not represent a function type nor 3165 // an array type. 3166 if (ConvType->isArrayType()) { 3167 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3168 ConvType = Context.getPointerType(ConvType); 3169 D.setInvalidType(); 3170 } else if (ConvType->isFunctionType()) { 3171 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3172 ConvType = Context.getPointerType(ConvType); 3173 D.setInvalidType(); 3174 } 3175 3176 // Rebuild the function type "R" without any parameters (in case any 3177 // of the errors above fired) and with the conversion type as the 3178 // return type. 3179 if (D.isInvalidType()) { 3180 R = Context.getFunctionType(ConvType, 0, 0, false, 3181 Proto->getTypeQuals(), 3182 Proto->hasExceptionSpec(), 3183 Proto->hasAnyExceptionSpec(), 3184 Proto->getNumExceptions(), 3185 Proto->exception_begin(), 3186 Proto->getExtInfo()); 3187 } 3188 3189 // C++0x explicit conversion operators. 3190 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3191 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3192 diag::warn_explicit_conversion_functions) 3193 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3194} 3195 3196/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3197/// the declaration of the given C++ conversion function. This routine 3198/// is responsible for recording the conversion function in the C++ 3199/// class, if possible. 3200Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3201 assert(Conversion && "Expected to receive a conversion function declaration"); 3202 3203 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3204 3205 // Make sure we aren't redeclaring the conversion function. 3206 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3207 3208 // C++ [class.conv.fct]p1: 3209 // [...] A conversion function is never used to convert a 3210 // (possibly cv-qualified) object to the (possibly cv-qualified) 3211 // same object type (or a reference to it), to a (possibly 3212 // cv-qualified) base class of that type (or a reference to it), 3213 // or to (possibly cv-qualified) void. 3214 // FIXME: Suppress this warning if the conversion function ends up being a 3215 // virtual function that overrides a virtual function in a base class. 3216 QualType ClassType 3217 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3218 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3219 ConvType = ConvTypeRef->getPointeeType(); 3220 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3221 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3222 /* Suppress diagnostics for instantiations. */; 3223 else if (ConvType->isRecordType()) { 3224 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3225 if (ConvType == ClassType) 3226 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3227 << ClassType; 3228 else if (IsDerivedFrom(ClassType, ConvType)) 3229 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3230 << ClassType << ConvType; 3231 } else if (ConvType->isVoidType()) { 3232 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3233 << ClassType << ConvType; 3234 } 3235 3236 if (Conversion->getPrimaryTemplate()) { 3237 // ignore specializations 3238 } else if (Conversion->getPreviousDeclaration()) { 3239 if (FunctionTemplateDecl *ConversionTemplate 3240 = Conversion->getDescribedFunctionTemplate()) { 3241 if (ClassDecl->replaceConversion( 3242 ConversionTemplate->getPreviousDeclaration(), 3243 ConversionTemplate)) 3244 return ConversionTemplate; 3245 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3246 Conversion)) 3247 return Conversion; 3248 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3249 } else if (FunctionTemplateDecl *ConversionTemplate 3250 = Conversion->getDescribedFunctionTemplate()) 3251 ClassDecl->addConversionFunction(ConversionTemplate); 3252 else 3253 ClassDecl->addConversionFunction(Conversion); 3254 3255 return Conversion; 3256} 3257 3258//===----------------------------------------------------------------------===// 3259// Namespace Handling 3260//===----------------------------------------------------------------------===// 3261 3262 3263 3264/// ActOnStartNamespaceDef - This is called at the start of a namespace 3265/// definition. 3266Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3267 SourceLocation InlineLoc, 3268 SourceLocation IdentLoc, 3269 IdentifierInfo *II, 3270 SourceLocation LBrace, 3271 AttributeList *AttrList) { 3272 // anonymous namespace starts at its left brace 3273 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3274 (II ? IdentLoc : LBrace) , II); 3275 Namespc->setLBracLoc(LBrace); 3276 Namespc->setInline(InlineLoc.isValid()); 3277 3278 Scope *DeclRegionScope = NamespcScope->getParent(); 3279 3280 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3281 3282 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3283 PushVisibilityAttr(attr); 3284 3285 if (II) { 3286 // C++ [namespace.def]p2: 3287 // The identifier in an original-namespace-definition shall not have been 3288 // previously defined in the declarative region in which the 3289 // original-namespace-definition appears. The identifier in an 3290 // original-namespace-definition is the name of the namespace. Subsequently 3291 // in that declarative region, it is treated as an original-namespace-name. 3292 3293 NamedDecl *PrevDecl 3294 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3295 ForRedeclaration); 3296 3297 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3298 // This is an extended namespace definition. 3299 if (Namespc->isInline() != OrigNS->isInline()) { 3300 // inline-ness must match 3301 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3302 << Namespc->isInline(); 3303 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3304 Namespc->setInvalidDecl(); 3305 // Recover by ignoring the new namespace's inline status. 3306 Namespc->setInline(OrigNS->isInline()); 3307 } 3308 3309 // Attach this namespace decl to the chain of extended namespace 3310 // definitions. 3311 OrigNS->setNextNamespace(Namespc); 3312 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3313 3314 // Remove the previous declaration from the scope. 3315 if (DeclRegionScope->isDeclScope(OrigNS)) { 3316 IdResolver.RemoveDecl(OrigNS); 3317 DeclRegionScope->RemoveDecl(OrigNS); 3318 } 3319 } else if (PrevDecl) { 3320 // This is an invalid name redefinition. 3321 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3322 << Namespc->getDeclName(); 3323 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3324 Namespc->setInvalidDecl(); 3325 // Continue on to push Namespc as current DeclContext and return it. 3326 } else if (II->isStr("std") && 3327 CurContext->getRedeclContext()->isTranslationUnit()) { 3328 // This is the first "real" definition of the namespace "std", so update 3329 // our cache of the "std" namespace to point at this definition. 3330 if (NamespaceDecl *StdNS = getStdNamespace()) { 3331 // We had already defined a dummy namespace "std". Link this new 3332 // namespace definition to the dummy namespace "std". 3333 StdNS->setNextNamespace(Namespc); 3334 StdNS->setLocation(IdentLoc); 3335 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3336 } 3337 3338 // Make our StdNamespace cache point at the first real definition of the 3339 // "std" namespace. 3340 StdNamespace = Namespc; 3341 } 3342 3343 PushOnScopeChains(Namespc, DeclRegionScope); 3344 } else { 3345 // Anonymous namespaces. 3346 assert(Namespc->isAnonymousNamespace()); 3347 3348 // Link the anonymous namespace into its parent. 3349 NamespaceDecl *PrevDecl; 3350 DeclContext *Parent = CurContext->getRedeclContext(); 3351 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3352 PrevDecl = TU->getAnonymousNamespace(); 3353 TU->setAnonymousNamespace(Namespc); 3354 } else { 3355 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3356 PrevDecl = ND->getAnonymousNamespace(); 3357 ND->setAnonymousNamespace(Namespc); 3358 } 3359 3360 // Link the anonymous namespace with its previous declaration. 3361 if (PrevDecl) { 3362 assert(PrevDecl->isAnonymousNamespace()); 3363 assert(!PrevDecl->getNextNamespace()); 3364 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3365 PrevDecl->setNextNamespace(Namespc); 3366 3367 if (Namespc->isInline() != PrevDecl->isInline()) { 3368 // inline-ness must match 3369 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3370 << Namespc->isInline(); 3371 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3372 Namespc->setInvalidDecl(); 3373 // Recover by ignoring the new namespace's inline status. 3374 Namespc->setInline(PrevDecl->isInline()); 3375 } 3376 } 3377 3378 CurContext->addDecl(Namespc); 3379 3380 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3381 // behaves as if it were replaced by 3382 // namespace unique { /* empty body */ } 3383 // using namespace unique; 3384 // namespace unique { namespace-body } 3385 // where all occurrences of 'unique' in a translation unit are 3386 // replaced by the same identifier and this identifier differs 3387 // from all other identifiers in the entire program. 3388 3389 // We just create the namespace with an empty name and then add an 3390 // implicit using declaration, just like the standard suggests. 3391 // 3392 // CodeGen enforces the "universally unique" aspect by giving all 3393 // declarations semantically contained within an anonymous 3394 // namespace internal linkage. 3395 3396 if (!PrevDecl) { 3397 UsingDirectiveDecl* UD 3398 = UsingDirectiveDecl::Create(Context, CurContext, 3399 /* 'using' */ LBrace, 3400 /* 'namespace' */ SourceLocation(), 3401 /* qualifier */ SourceRange(), 3402 /* NNS */ NULL, 3403 /* identifier */ SourceLocation(), 3404 Namespc, 3405 /* Ancestor */ CurContext); 3406 UD->setImplicit(); 3407 CurContext->addDecl(UD); 3408 } 3409 } 3410 3411 // Although we could have an invalid decl (i.e. the namespace name is a 3412 // redefinition), push it as current DeclContext and try to continue parsing. 3413 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3414 // for the namespace has the declarations that showed up in that particular 3415 // namespace definition. 3416 PushDeclContext(NamespcScope, Namespc); 3417 return Namespc; 3418} 3419 3420/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3421/// is a namespace alias, returns the namespace it points to. 3422static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3423 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3424 return AD->getNamespace(); 3425 return dyn_cast_or_null<NamespaceDecl>(D); 3426} 3427 3428/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3429/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3430void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3431 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3432 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3433 Namespc->setRBracLoc(RBrace); 3434 PopDeclContext(); 3435 if (Namespc->hasAttr<VisibilityAttr>()) 3436 PopPragmaVisibility(); 3437} 3438 3439CXXRecordDecl *Sema::getStdBadAlloc() const { 3440 return cast_or_null<CXXRecordDecl>( 3441 StdBadAlloc.get(Context.getExternalSource())); 3442} 3443 3444NamespaceDecl *Sema::getStdNamespace() const { 3445 return cast_or_null<NamespaceDecl>( 3446 StdNamespace.get(Context.getExternalSource())); 3447} 3448 3449/// \brief Retrieve the special "std" namespace, which may require us to 3450/// implicitly define the namespace. 3451NamespaceDecl *Sema::getOrCreateStdNamespace() { 3452 if (!StdNamespace) { 3453 // The "std" namespace has not yet been defined, so build one implicitly. 3454 StdNamespace = NamespaceDecl::Create(Context, 3455 Context.getTranslationUnitDecl(), 3456 SourceLocation(), 3457 &PP.getIdentifierTable().get("std")); 3458 getStdNamespace()->setImplicit(true); 3459 } 3460 3461 return getStdNamespace(); 3462} 3463 3464Decl *Sema::ActOnUsingDirective(Scope *S, 3465 SourceLocation UsingLoc, 3466 SourceLocation NamespcLoc, 3467 CXXScopeSpec &SS, 3468 SourceLocation IdentLoc, 3469 IdentifierInfo *NamespcName, 3470 AttributeList *AttrList) { 3471 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3472 assert(NamespcName && "Invalid NamespcName."); 3473 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3474 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3475 3476 UsingDirectiveDecl *UDir = 0; 3477 NestedNameSpecifier *Qualifier = 0; 3478 if (SS.isSet()) 3479 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3480 3481 // Lookup namespace name. 3482 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3483 LookupParsedName(R, S, &SS); 3484 if (R.isAmbiguous()) 3485 return 0; 3486 3487 if (R.empty()) { 3488 // Allow "using namespace std;" or "using namespace ::std;" even if 3489 // "std" hasn't been defined yet, for GCC compatibility. 3490 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3491 NamespcName->isStr("std")) { 3492 Diag(IdentLoc, diag::ext_using_undefined_std); 3493 R.addDecl(getOrCreateStdNamespace()); 3494 R.resolveKind(); 3495 } 3496 // Otherwise, attempt typo correction. 3497 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3498 CTC_NoKeywords, 0)) { 3499 if (R.getAsSingle<NamespaceDecl>() || 3500 R.getAsSingle<NamespaceAliasDecl>()) { 3501 if (DeclContext *DC = computeDeclContext(SS, false)) 3502 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3503 << NamespcName << DC << Corrected << SS.getRange() 3504 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3505 else 3506 Diag(IdentLoc, diag::err_using_directive_suggest) 3507 << NamespcName << Corrected 3508 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3509 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3510 << Corrected; 3511 3512 NamespcName = Corrected.getAsIdentifierInfo(); 3513 } else { 3514 R.clear(); 3515 R.setLookupName(NamespcName); 3516 } 3517 } 3518 } 3519 3520 if (!R.empty()) { 3521 NamedDecl *Named = R.getFoundDecl(); 3522 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3523 && "expected namespace decl"); 3524 // C++ [namespace.udir]p1: 3525 // A using-directive specifies that the names in the nominated 3526 // namespace can be used in the scope in which the 3527 // using-directive appears after the using-directive. During 3528 // unqualified name lookup (3.4.1), the names appear as if they 3529 // were declared in the nearest enclosing namespace which 3530 // contains both the using-directive and the nominated 3531 // namespace. [Note: in this context, "contains" means "contains 3532 // directly or indirectly". ] 3533 3534 // Find enclosing context containing both using-directive and 3535 // nominated namespace. 3536 NamespaceDecl *NS = getNamespaceDecl(Named); 3537 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3538 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3539 CommonAncestor = CommonAncestor->getParent(); 3540 3541 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3542 SS.getRange(), 3543 (NestedNameSpecifier *)SS.getScopeRep(), 3544 IdentLoc, Named, CommonAncestor); 3545 PushUsingDirective(S, UDir); 3546 } else { 3547 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3548 } 3549 3550 // FIXME: We ignore attributes for now. 3551 delete AttrList; 3552 return UDir; 3553} 3554 3555void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3556 // If scope has associated entity, then using directive is at namespace 3557 // or translation unit scope. We add UsingDirectiveDecls, into 3558 // it's lookup structure. 3559 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3560 Ctx->addDecl(UDir); 3561 else 3562 // Otherwise it is block-sope. using-directives will affect lookup 3563 // only to the end of scope. 3564 S->PushUsingDirective(UDir); 3565} 3566 3567 3568Decl *Sema::ActOnUsingDeclaration(Scope *S, 3569 AccessSpecifier AS, 3570 bool HasUsingKeyword, 3571 SourceLocation UsingLoc, 3572 CXXScopeSpec &SS, 3573 UnqualifiedId &Name, 3574 AttributeList *AttrList, 3575 bool IsTypeName, 3576 SourceLocation TypenameLoc) { 3577 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3578 3579 switch (Name.getKind()) { 3580 case UnqualifiedId::IK_Identifier: 3581 case UnqualifiedId::IK_OperatorFunctionId: 3582 case UnqualifiedId::IK_LiteralOperatorId: 3583 case UnqualifiedId::IK_ConversionFunctionId: 3584 break; 3585 3586 case UnqualifiedId::IK_ConstructorName: 3587 case UnqualifiedId::IK_ConstructorTemplateId: 3588 // C++0x inherited constructors. 3589 if (getLangOptions().CPlusPlus0x) break; 3590 3591 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3592 << SS.getRange(); 3593 return 0; 3594 3595 case UnqualifiedId::IK_DestructorName: 3596 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3597 << SS.getRange(); 3598 return 0; 3599 3600 case UnqualifiedId::IK_TemplateId: 3601 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3602 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3603 return 0; 3604 } 3605 3606 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3607 DeclarationName TargetName = TargetNameInfo.getName(); 3608 if (!TargetName) 3609 return 0; 3610 3611 // Warn about using declarations. 3612 // TODO: store that the declaration was written without 'using' and 3613 // talk about access decls instead of using decls in the 3614 // diagnostics. 3615 if (!HasUsingKeyword) { 3616 UsingLoc = Name.getSourceRange().getBegin(); 3617 3618 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3619 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3620 } 3621 3622 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3623 TargetNameInfo, AttrList, 3624 /* IsInstantiation */ false, 3625 IsTypeName, TypenameLoc); 3626 if (UD) 3627 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3628 3629 return UD; 3630} 3631 3632/// \brief Determine whether a using declaration considers the given 3633/// declarations as "equivalent", e.g., if they are redeclarations of 3634/// the same entity or are both typedefs of the same type. 3635static bool 3636IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3637 bool &SuppressRedeclaration) { 3638 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3639 SuppressRedeclaration = false; 3640 return true; 3641 } 3642 3643 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3644 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3645 SuppressRedeclaration = true; 3646 return Context.hasSameType(TD1->getUnderlyingType(), 3647 TD2->getUnderlyingType()); 3648 } 3649 3650 return false; 3651} 3652 3653 3654/// Determines whether to create a using shadow decl for a particular 3655/// decl, given the set of decls existing prior to this using lookup. 3656bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3657 const LookupResult &Previous) { 3658 // Diagnose finding a decl which is not from a base class of the 3659 // current class. We do this now because there are cases where this 3660 // function will silently decide not to build a shadow decl, which 3661 // will pre-empt further diagnostics. 3662 // 3663 // We don't need to do this in C++0x because we do the check once on 3664 // the qualifier. 3665 // 3666 // FIXME: diagnose the following if we care enough: 3667 // struct A { int foo; }; 3668 // struct B : A { using A::foo; }; 3669 // template <class T> struct C : A {}; 3670 // template <class T> struct D : C<T> { using B::foo; } // <--- 3671 // This is invalid (during instantiation) in C++03 because B::foo 3672 // resolves to the using decl in B, which is not a base class of D<T>. 3673 // We can't diagnose it immediately because C<T> is an unknown 3674 // specialization. The UsingShadowDecl in D<T> then points directly 3675 // to A::foo, which will look well-formed when we instantiate. 3676 // The right solution is to not collapse the shadow-decl chain. 3677 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3678 DeclContext *OrigDC = Orig->getDeclContext(); 3679 3680 // Handle enums and anonymous structs. 3681 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3682 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3683 while (OrigRec->isAnonymousStructOrUnion()) 3684 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3685 3686 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3687 if (OrigDC == CurContext) { 3688 Diag(Using->getLocation(), 3689 diag::err_using_decl_nested_name_specifier_is_current_class) 3690 << Using->getNestedNameRange(); 3691 Diag(Orig->getLocation(), diag::note_using_decl_target); 3692 return true; 3693 } 3694 3695 Diag(Using->getNestedNameRange().getBegin(), 3696 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3697 << Using->getTargetNestedNameDecl() 3698 << cast<CXXRecordDecl>(CurContext) 3699 << Using->getNestedNameRange(); 3700 Diag(Orig->getLocation(), diag::note_using_decl_target); 3701 return true; 3702 } 3703 } 3704 3705 if (Previous.empty()) return false; 3706 3707 NamedDecl *Target = Orig; 3708 if (isa<UsingShadowDecl>(Target)) 3709 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3710 3711 // If the target happens to be one of the previous declarations, we 3712 // don't have a conflict. 3713 // 3714 // FIXME: but we might be increasing its access, in which case we 3715 // should redeclare it. 3716 NamedDecl *NonTag = 0, *Tag = 0; 3717 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3718 I != E; ++I) { 3719 NamedDecl *D = (*I)->getUnderlyingDecl(); 3720 bool Result; 3721 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3722 return Result; 3723 3724 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3725 } 3726 3727 if (Target->isFunctionOrFunctionTemplate()) { 3728 FunctionDecl *FD; 3729 if (isa<FunctionTemplateDecl>(Target)) 3730 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3731 else 3732 FD = cast<FunctionDecl>(Target); 3733 3734 NamedDecl *OldDecl = 0; 3735 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3736 case Ovl_Overload: 3737 return false; 3738 3739 case Ovl_NonFunction: 3740 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3741 break; 3742 3743 // We found a decl with the exact signature. 3744 case Ovl_Match: 3745 // If we're in a record, we want to hide the target, so we 3746 // return true (without a diagnostic) to tell the caller not to 3747 // build a shadow decl. 3748 if (CurContext->isRecord()) 3749 return true; 3750 3751 // If we're not in a record, this is an error. 3752 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3753 break; 3754 } 3755 3756 Diag(Target->getLocation(), diag::note_using_decl_target); 3757 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3758 return true; 3759 } 3760 3761 // Target is not a function. 3762 3763 if (isa<TagDecl>(Target)) { 3764 // No conflict between a tag and a non-tag. 3765 if (!Tag) return false; 3766 3767 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3768 Diag(Target->getLocation(), diag::note_using_decl_target); 3769 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3770 return true; 3771 } 3772 3773 // No conflict between a tag and a non-tag. 3774 if (!NonTag) return false; 3775 3776 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3777 Diag(Target->getLocation(), diag::note_using_decl_target); 3778 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3779 return true; 3780} 3781 3782/// Builds a shadow declaration corresponding to a 'using' declaration. 3783UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3784 UsingDecl *UD, 3785 NamedDecl *Orig) { 3786 3787 // If we resolved to another shadow declaration, just coalesce them. 3788 NamedDecl *Target = Orig; 3789 if (isa<UsingShadowDecl>(Target)) { 3790 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3791 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3792 } 3793 3794 UsingShadowDecl *Shadow 3795 = UsingShadowDecl::Create(Context, CurContext, 3796 UD->getLocation(), UD, Target); 3797 UD->addShadowDecl(Shadow); 3798 3799 if (S) 3800 PushOnScopeChains(Shadow, S); 3801 else 3802 CurContext->addDecl(Shadow); 3803 Shadow->setAccess(UD->getAccess()); 3804 3805 // Register it as a conversion if appropriate. 3806 if (Shadow->getDeclName().getNameKind() 3807 == DeclarationName::CXXConversionFunctionName) 3808 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3809 3810 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3811 Shadow->setInvalidDecl(); 3812 3813 return Shadow; 3814} 3815 3816/// Hides a using shadow declaration. This is required by the current 3817/// using-decl implementation when a resolvable using declaration in a 3818/// class is followed by a declaration which would hide or override 3819/// one or more of the using decl's targets; for example: 3820/// 3821/// struct Base { void foo(int); }; 3822/// struct Derived : Base { 3823/// using Base::foo; 3824/// void foo(int); 3825/// }; 3826/// 3827/// The governing language is C++03 [namespace.udecl]p12: 3828/// 3829/// When a using-declaration brings names from a base class into a 3830/// derived class scope, member functions in the derived class 3831/// override and/or hide member functions with the same name and 3832/// parameter types in a base class (rather than conflicting). 3833/// 3834/// There are two ways to implement this: 3835/// (1) optimistically create shadow decls when they're not hidden 3836/// by existing declarations, or 3837/// (2) don't create any shadow decls (or at least don't make them 3838/// visible) until we've fully parsed/instantiated the class. 3839/// The problem with (1) is that we might have to retroactively remove 3840/// a shadow decl, which requires several O(n) operations because the 3841/// decl structures are (very reasonably) not designed for removal. 3842/// (2) avoids this but is very fiddly and phase-dependent. 3843void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3844 if (Shadow->getDeclName().getNameKind() == 3845 DeclarationName::CXXConversionFunctionName) 3846 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3847 3848 // Remove it from the DeclContext... 3849 Shadow->getDeclContext()->removeDecl(Shadow); 3850 3851 // ...and the scope, if applicable... 3852 if (S) { 3853 S->RemoveDecl(Shadow); 3854 IdResolver.RemoveDecl(Shadow); 3855 } 3856 3857 // ...and the using decl. 3858 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3859 3860 // TODO: complain somehow if Shadow was used. It shouldn't 3861 // be possible for this to happen, because...? 3862} 3863 3864/// Builds a using declaration. 3865/// 3866/// \param IsInstantiation - Whether this call arises from an 3867/// instantiation of an unresolved using declaration. We treat 3868/// the lookup differently for these declarations. 3869NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3870 SourceLocation UsingLoc, 3871 CXXScopeSpec &SS, 3872 const DeclarationNameInfo &NameInfo, 3873 AttributeList *AttrList, 3874 bool IsInstantiation, 3875 bool IsTypeName, 3876 SourceLocation TypenameLoc) { 3877 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3878 SourceLocation IdentLoc = NameInfo.getLoc(); 3879 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3880 3881 // FIXME: We ignore attributes for now. 3882 delete AttrList; 3883 3884 if (SS.isEmpty()) { 3885 Diag(IdentLoc, diag::err_using_requires_qualname); 3886 return 0; 3887 } 3888 3889 // Do the redeclaration lookup in the current scope. 3890 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3891 ForRedeclaration); 3892 Previous.setHideTags(false); 3893 if (S) { 3894 LookupName(Previous, S); 3895 3896 // It is really dumb that we have to do this. 3897 LookupResult::Filter F = Previous.makeFilter(); 3898 while (F.hasNext()) { 3899 NamedDecl *D = F.next(); 3900 if (!isDeclInScope(D, CurContext, S)) 3901 F.erase(); 3902 } 3903 F.done(); 3904 } else { 3905 assert(IsInstantiation && "no scope in non-instantiation"); 3906 assert(CurContext->isRecord() && "scope not record in instantiation"); 3907 LookupQualifiedName(Previous, CurContext); 3908 } 3909 3910 NestedNameSpecifier *NNS = 3911 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3912 3913 // Check for invalid redeclarations. 3914 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3915 return 0; 3916 3917 // Check for bad qualifiers. 3918 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3919 return 0; 3920 3921 DeclContext *LookupContext = computeDeclContext(SS); 3922 NamedDecl *D; 3923 if (!LookupContext) { 3924 if (IsTypeName) { 3925 // FIXME: not all declaration name kinds are legal here 3926 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3927 UsingLoc, TypenameLoc, 3928 SS.getRange(), NNS, 3929 IdentLoc, NameInfo.getName()); 3930 } else { 3931 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3932 UsingLoc, SS.getRange(), 3933 NNS, NameInfo); 3934 } 3935 } else { 3936 D = UsingDecl::Create(Context, CurContext, 3937 SS.getRange(), UsingLoc, NNS, NameInfo, 3938 IsTypeName); 3939 } 3940 D->setAccess(AS); 3941 CurContext->addDecl(D); 3942 3943 if (!LookupContext) return D; 3944 UsingDecl *UD = cast<UsingDecl>(D); 3945 3946 if (RequireCompleteDeclContext(SS, LookupContext)) { 3947 UD->setInvalidDecl(); 3948 return UD; 3949 } 3950 3951 // Look up the target name. 3952 3953 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3954 3955 // Unlike most lookups, we don't always want to hide tag 3956 // declarations: tag names are visible through the using declaration 3957 // even if hidden by ordinary names, *except* in a dependent context 3958 // where it's important for the sanity of two-phase lookup. 3959 if (!IsInstantiation) 3960 R.setHideTags(false); 3961 3962 LookupQualifiedName(R, LookupContext); 3963 3964 if (R.empty()) { 3965 Diag(IdentLoc, diag::err_no_member) 3966 << NameInfo.getName() << LookupContext << SS.getRange(); 3967 UD->setInvalidDecl(); 3968 return UD; 3969 } 3970 3971 if (R.isAmbiguous()) { 3972 UD->setInvalidDecl(); 3973 return UD; 3974 } 3975 3976 if (IsTypeName) { 3977 // If we asked for a typename and got a non-type decl, error out. 3978 if (!R.getAsSingle<TypeDecl>()) { 3979 Diag(IdentLoc, diag::err_using_typename_non_type); 3980 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3981 Diag((*I)->getUnderlyingDecl()->getLocation(), 3982 diag::note_using_decl_target); 3983 UD->setInvalidDecl(); 3984 return UD; 3985 } 3986 } else { 3987 // If we asked for a non-typename and we got a type, error out, 3988 // but only if this is an instantiation of an unresolved using 3989 // decl. Otherwise just silently find the type name. 3990 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3991 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3992 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3993 UD->setInvalidDecl(); 3994 return UD; 3995 } 3996 } 3997 3998 // C++0x N2914 [namespace.udecl]p6: 3999 // A using-declaration shall not name a namespace. 4000 if (R.getAsSingle<NamespaceDecl>()) { 4001 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4002 << SS.getRange(); 4003 UD->setInvalidDecl(); 4004 return UD; 4005 } 4006 4007 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4008 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4009 BuildUsingShadowDecl(S, UD, *I); 4010 } 4011 4012 return UD; 4013} 4014 4015/// Checks that the given using declaration is not an invalid 4016/// redeclaration. Note that this is checking only for the using decl 4017/// itself, not for any ill-formedness among the UsingShadowDecls. 4018bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4019 bool isTypeName, 4020 const CXXScopeSpec &SS, 4021 SourceLocation NameLoc, 4022 const LookupResult &Prev) { 4023 // C++03 [namespace.udecl]p8: 4024 // C++0x [namespace.udecl]p10: 4025 // A using-declaration is a declaration and can therefore be used 4026 // repeatedly where (and only where) multiple declarations are 4027 // allowed. 4028 // 4029 // That's in non-member contexts. 4030 if (!CurContext->getRedeclContext()->isRecord()) 4031 return false; 4032 4033 NestedNameSpecifier *Qual 4034 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4035 4036 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4037 NamedDecl *D = *I; 4038 4039 bool DTypename; 4040 NestedNameSpecifier *DQual; 4041 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4042 DTypename = UD->isTypeName(); 4043 DQual = UD->getTargetNestedNameDecl(); 4044 } else if (UnresolvedUsingValueDecl *UD 4045 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4046 DTypename = false; 4047 DQual = UD->getTargetNestedNameSpecifier(); 4048 } else if (UnresolvedUsingTypenameDecl *UD 4049 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4050 DTypename = true; 4051 DQual = UD->getTargetNestedNameSpecifier(); 4052 } else continue; 4053 4054 // using decls differ if one says 'typename' and the other doesn't. 4055 // FIXME: non-dependent using decls? 4056 if (isTypeName != DTypename) continue; 4057 4058 // using decls differ if they name different scopes (but note that 4059 // template instantiation can cause this check to trigger when it 4060 // didn't before instantiation). 4061 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4062 Context.getCanonicalNestedNameSpecifier(DQual)) 4063 continue; 4064 4065 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4066 Diag(D->getLocation(), diag::note_using_decl) << 1; 4067 return true; 4068 } 4069 4070 return false; 4071} 4072 4073 4074/// Checks that the given nested-name qualifier used in a using decl 4075/// in the current context is appropriately related to the current 4076/// scope. If an error is found, diagnoses it and returns true. 4077bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4078 const CXXScopeSpec &SS, 4079 SourceLocation NameLoc) { 4080 DeclContext *NamedContext = computeDeclContext(SS); 4081 4082 if (!CurContext->isRecord()) { 4083 // C++03 [namespace.udecl]p3: 4084 // C++0x [namespace.udecl]p8: 4085 // A using-declaration for a class member shall be a member-declaration. 4086 4087 // If we weren't able to compute a valid scope, it must be a 4088 // dependent class scope. 4089 if (!NamedContext || NamedContext->isRecord()) { 4090 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4091 << SS.getRange(); 4092 return true; 4093 } 4094 4095 // Otherwise, everything is known to be fine. 4096 return false; 4097 } 4098 4099 // The current scope is a record. 4100 4101 // If the named context is dependent, we can't decide much. 4102 if (!NamedContext) { 4103 // FIXME: in C++0x, we can diagnose if we can prove that the 4104 // nested-name-specifier does not refer to a base class, which is 4105 // still possible in some cases. 4106 4107 // Otherwise we have to conservatively report that things might be 4108 // okay. 4109 return false; 4110 } 4111 4112 if (!NamedContext->isRecord()) { 4113 // Ideally this would point at the last name in the specifier, 4114 // but we don't have that level of source info. 4115 Diag(SS.getRange().getBegin(), 4116 diag::err_using_decl_nested_name_specifier_is_not_class) 4117 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4118 return true; 4119 } 4120 4121 if (getLangOptions().CPlusPlus0x) { 4122 // C++0x [namespace.udecl]p3: 4123 // In a using-declaration used as a member-declaration, the 4124 // nested-name-specifier shall name a base class of the class 4125 // being defined. 4126 4127 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4128 cast<CXXRecordDecl>(NamedContext))) { 4129 if (CurContext == NamedContext) { 4130 Diag(NameLoc, 4131 diag::err_using_decl_nested_name_specifier_is_current_class) 4132 << SS.getRange(); 4133 return true; 4134 } 4135 4136 Diag(SS.getRange().getBegin(), 4137 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4138 << (NestedNameSpecifier*) SS.getScopeRep() 4139 << cast<CXXRecordDecl>(CurContext) 4140 << SS.getRange(); 4141 return true; 4142 } 4143 4144 return false; 4145 } 4146 4147 // C++03 [namespace.udecl]p4: 4148 // A using-declaration used as a member-declaration shall refer 4149 // to a member of a base class of the class being defined [etc.]. 4150 4151 // Salient point: SS doesn't have to name a base class as long as 4152 // lookup only finds members from base classes. Therefore we can 4153 // diagnose here only if we can prove that that can't happen, 4154 // i.e. if the class hierarchies provably don't intersect. 4155 4156 // TODO: it would be nice if "definitely valid" results were cached 4157 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4158 // need to be repeated. 4159 4160 struct UserData { 4161 llvm::DenseSet<const CXXRecordDecl*> Bases; 4162 4163 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4164 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4165 Data->Bases.insert(Base); 4166 return true; 4167 } 4168 4169 bool hasDependentBases(const CXXRecordDecl *Class) { 4170 return !Class->forallBases(collect, this); 4171 } 4172 4173 /// Returns true if the base is dependent or is one of the 4174 /// accumulated base classes. 4175 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4176 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4177 return !Data->Bases.count(Base); 4178 } 4179 4180 bool mightShareBases(const CXXRecordDecl *Class) { 4181 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4182 } 4183 }; 4184 4185 UserData Data; 4186 4187 // Returns false if we find a dependent base. 4188 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4189 return false; 4190 4191 // Returns false if the class has a dependent base or if it or one 4192 // of its bases is present in the base set of the current context. 4193 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4194 return false; 4195 4196 Diag(SS.getRange().getBegin(), 4197 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4198 << (NestedNameSpecifier*) SS.getScopeRep() 4199 << cast<CXXRecordDecl>(CurContext) 4200 << SS.getRange(); 4201 4202 return true; 4203} 4204 4205Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4206 SourceLocation NamespaceLoc, 4207 SourceLocation AliasLoc, 4208 IdentifierInfo *Alias, 4209 CXXScopeSpec &SS, 4210 SourceLocation IdentLoc, 4211 IdentifierInfo *Ident) { 4212 4213 // Lookup the namespace name. 4214 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4215 LookupParsedName(R, S, &SS); 4216 4217 // Check if we have a previous declaration with the same name. 4218 NamedDecl *PrevDecl 4219 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4220 ForRedeclaration); 4221 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4222 PrevDecl = 0; 4223 4224 if (PrevDecl) { 4225 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4226 // We already have an alias with the same name that points to the same 4227 // namespace, so don't create a new one. 4228 // FIXME: At some point, we'll want to create the (redundant) 4229 // declaration to maintain better source information. 4230 if (!R.isAmbiguous() && !R.empty() && 4231 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4232 return 0; 4233 } 4234 4235 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4236 diag::err_redefinition_different_kind; 4237 Diag(AliasLoc, DiagID) << Alias; 4238 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4239 return 0; 4240 } 4241 4242 if (R.isAmbiguous()) 4243 return 0; 4244 4245 if (R.empty()) { 4246 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4247 CTC_NoKeywords, 0)) { 4248 if (R.getAsSingle<NamespaceDecl>() || 4249 R.getAsSingle<NamespaceAliasDecl>()) { 4250 if (DeclContext *DC = computeDeclContext(SS, false)) 4251 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4252 << Ident << DC << Corrected << SS.getRange() 4253 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4254 else 4255 Diag(IdentLoc, diag::err_using_directive_suggest) 4256 << Ident << Corrected 4257 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4258 4259 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4260 << Corrected; 4261 4262 Ident = Corrected.getAsIdentifierInfo(); 4263 } else { 4264 R.clear(); 4265 R.setLookupName(Ident); 4266 } 4267 } 4268 4269 if (R.empty()) { 4270 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4271 return 0; 4272 } 4273 } 4274 4275 NamespaceAliasDecl *AliasDecl = 4276 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4277 Alias, SS.getRange(), 4278 (NestedNameSpecifier *)SS.getScopeRep(), 4279 IdentLoc, R.getFoundDecl()); 4280 4281 PushOnScopeChains(AliasDecl, S); 4282 return AliasDecl; 4283} 4284 4285namespace { 4286 /// \brief Scoped object used to handle the state changes required in Sema 4287 /// to implicitly define the body of a C++ member function; 4288 class ImplicitlyDefinedFunctionScope { 4289 Sema &S; 4290 DeclContext *PreviousContext; 4291 4292 public: 4293 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4294 : S(S), PreviousContext(S.CurContext) 4295 { 4296 S.CurContext = Method; 4297 S.PushFunctionScope(); 4298 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4299 } 4300 4301 ~ImplicitlyDefinedFunctionScope() { 4302 S.PopExpressionEvaluationContext(); 4303 S.PopFunctionOrBlockScope(); 4304 S.CurContext = PreviousContext; 4305 } 4306 }; 4307} 4308 4309static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4310 CXXRecordDecl *D) { 4311 ASTContext &Context = Self.Context; 4312 QualType ClassType = Context.getTypeDeclType(D); 4313 DeclarationName ConstructorName 4314 = Context.DeclarationNames.getCXXConstructorName( 4315 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4316 4317 DeclContext::lookup_const_iterator Con, ConEnd; 4318 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4319 Con != ConEnd; ++Con) { 4320 // FIXME: In C++0x, a constructor template can be a default constructor. 4321 if (isa<FunctionTemplateDecl>(*Con)) 4322 continue; 4323 4324 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4325 if (Constructor->isDefaultConstructor()) 4326 return Constructor; 4327 } 4328 return 0; 4329} 4330 4331CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4332 CXXRecordDecl *ClassDecl) { 4333 // C++ [class.ctor]p5: 4334 // A default constructor for a class X is a constructor of class X 4335 // that can be called without an argument. If there is no 4336 // user-declared constructor for class X, a default constructor is 4337 // implicitly declared. An implicitly-declared default constructor 4338 // is an inline public member of its class. 4339 assert(!ClassDecl->hasUserDeclaredConstructor() && 4340 "Should not build implicit default constructor!"); 4341 4342 // C++ [except.spec]p14: 4343 // An implicitly declared special member function (Clause 12) shall have an 4344 // exception-specification. [...] 4345 ImplicitExceptionSpecification ExceptSpec(Context); 4346 4347 // Direct base-class destructors. 4348 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4349 BEnd = ClassDecl->bases_end(); 4350 B != BEnd; ++B) { 4351 if (B->isVirtual()) // Handled below. 4352 continue; 4353 4354 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4355 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4356 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4357 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4358 else if (CXXConstructorDecl *Constructor 4359 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4360 ExceptSpec.CalledDecl(Constructor); 4361 } 4362 } 4363 4364 // Virtual base-class destructors. 4365 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4366 BEnd = ClassDecl->vbases_end(); 4367 B != BEnd; ++B) { 4368 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4369 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4370 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4371 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4372 else if (CXXConstructorDecl *Constructor 4373 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4374 ExceptSpec.CalledDecl(Constructor); 4375 } 4376 } 4377 4378 // Field destructors. 4379 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4380 FEnd = ClassDecl->field_end(); 4381 F != FEnd; ++F) { 4382 if (const RecordType *RecordTy 4383 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4384 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4385 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4386 ExceptSpec.CalledDecl( 4387 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4388 else if (CXXConstructorDecl *Constructor 4389 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4390 ExceptSpec.CalledDecl(Constructor); 4391 } 4392 } 4393 4394 4395 // Create the actual constructor declaration. 4396 CanQualType ClassType 4397 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4398 DeclarationName Name 4399 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4400 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4401 CXXConstructorDecl *DefaultCon 4402 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4403 Context.getFunctionType(Context.VoidTy, 4404 0, 0, false, 0, 4405 ExceptSpec.hasExceptionSpecification(), 4406 ExceptSpec.hasAnyExceptionSpecification(), 4407 ExceptSpec.size(), 4408 ExceptSpec.data(), 4409 FunctionType::ExtInfo()), 4410 /*TInfo=*/0, 4411 /*isExplicit=*/false, 4412 /*isInline=*/true, 4413 /*isImplicitlyDeclared=*/true); 4414 DefaultCon->setAccess(AS_public); 4415 DefaultCon->setImplicit(); 4416 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4417 4418 // Note that we have declared this constructor. 4419 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4420 4421 if (Scope *S = getScopeForContext(ClassDecl)) 4422 PushOnScopeChains(DefaultCon, S, false); 4423 ClassDecl->addDecl(DefaultCon); 4424 4425 return DefaultCon; 4426} 4427 4428void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4429 CXXConstructorDecl *Constructor) { 4430 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4431 !Constructor->isUsed(false)) && 4432 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4433 4434 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4435 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4436 4437 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4438 ErrorTrap Trap(*this); 4439 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4440 Trap.hasErrorOccurred()) { 4441 Diag(CurrentLocation, diag::note_member_synthesized_at) 4442 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4443 Constructor->setInvalidDecl(); 4444 return; 4445 } 4446 4447 SourceLocation Loc = Constructor->getLocation(); 4448 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4449 4450 Constructor->setUsed(); 4451 MarkVTableUsed(CurrentLocation, ClassDecl); 4452} 4453 4454CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4455 // C++ [class.dtor]p2: 4456 // If a class has no user-declared destructor, a destructor is 4457 // declared implicitly. An implicitly-declared destructor is an 4458 // inline public member of its class. 4459 4460 // C++ [except.spec]p14: 4461 // An implicitly declared special member function (Clause 12) shall have 4462 // an exception-specification. 4463 ImplicitExceptionSpecification ExceptSpec(Context); 4464 4465 // Direct base-class destructors. 4466 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4467 BEnd = ClassDecl->bases_end(); 4468 B != BEnd; ++B) { 4469 if (B->isVirtual()) // Handled below. 4470 continue; 4471 4472 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4473 ExceptSpec.CalledDecl( 4474 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4475 } 4476 4477 // Virtual base-class destructors. 4478 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4479 BEnd = ClassDecl->vbases_end(); 4480 B != BEnd; ++B) { 4481 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4482 ExceptSpec.CalledDecl( 4483 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4484 } 4485 4486 // Field destructors. 4487 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4488 FEnd = ClassDecl->field_end(); 4489 F != FEnd; ++F) { 4490 if (const RecordType *RecordTy 4491 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4492 ExceptSpec.CalledDecl( 4493 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4494 } 4495 4496 // Create the actual destructor declaration. 4497 QualType Ty = Context.getFunctionType(Context.VoidTy, 4498 0, 0, false, 0, 4499 ExceptSpec.hasExceptionSpecification(), 4500 ExceptSpec.hasAnyExceptionSpecification(), 4501 ExceptSpec.size(), 4502 ExceptSpec.data(), 4503 FunctionType::ExtInfo()); 4504 4505 CanQualType ClassType 4506 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4507 DeclarationName Name 4508 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4509 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4510 CXXDestructorDecl *Destructor 4511 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4512 /*isInline=*/true, 4513 /*isImplicitlyDeclared=*/true); 4514 Destructor->setAccess(AS_public); 4515 Destructor->setImplicit(); 4516 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4517 4518 // Note that we have declared this destructor. 4519 ++ASTContext::NumImplicitDestructorsDeclared; 4520 4521 // Introduce this destructor into its scope. 4522 if (Scope *S = getScopeForContext(ClassDecl)) 4523 PushOnScopeChains(Destructor, S, false); 4524 ClassDecl->addDecl(Destructor); 4525 4526 // This could be uniqued if it ever proves significant. 4527 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4528 4529 AddOverriddenMethods(ClassDecl, Destructor); 4530 4531 return Destructor; 4532} 4533 4534void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4535 CXXDestructorDecl *Destructor) { 4536 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4537 "DefineImplicitDestructor - call it for implicit default dtor"); 4538 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4539 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4540 4541 if (Destructor->isInvalidDecl()) 4542 return; 4543 4544 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4545 4546 ErrorTrap Trap(*this); 4547 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4548 Destructor->getParent()); 4549 4550 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4551 Diag(CurrentLocation, diag::note_member_synthesized_at) 4552 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4553 4554 Destructor->setInvalidDecl(); 4555 return; 4556 } 4557 4558 SourceLocation Loc = Destructor->getLocation(); 4559 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4560 4561 Destructor->setUsed(); 4562 MarkVTableUsed(CurrentLocation, ClassDecl); 4563} 4564 4565/// \brief Builds a statement that copies the given entity from \p From to 4566/// \c To. 4567/// 4568/// This routine is used to copy the members of a class with an 4569/// implicitly-declared copy assignment operator. When the entities being 4570/// copied are arrays, this routine builds for loops to copy them. 4571/// 4572/// \param S The Sema object used for type-checking. 4573/// 4574/// \param Loc The location where the implicit copy is being generated. 4575/// 4576/// \param T The type of the expressions being copied. Both expressions must 4577/// have this type. 4578/// 4579/// \param To The expression we are copying to. 4580/// 4581/// \param From The expression we are copying from. 4582/// 4583/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4584/// Otherwise, it's a non-static member subobject. 4585/// 4586/// \param Depth Internal parameter recording the depth of the recursion. 4587/// 4588/// \returns A statement or a loop that copies the expressions. 4589static StmtResult 4590BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4591 Expr *To, Expr *From, 4592 bool CopyingBaseSubobject, unsigned Depth = 0) { 4593 // C++0x [class.copy]p30: 4594 // Each subobject is assigned in the manner appropriate to its type: 4595 // 4596 // - if the subobject is of class type, the copy assignment operator 4597 // for the class is used (as if by explicit qualification; that is, 4598 // ignoring any possible virtual overriding functions in more derived 4599 // classes); 4600 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4601 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4602 4603 // Look for operator=. 4604 DeclarationName Name 4605 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4606 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4607 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4608 4609 // Filter out any result that isn't a copy-assignment operator. 4610 LookupResult::Filter F = OpLookup.makeFilter(); 4611 while (F.hasNext()) { 4612 NamedDecl *D = F.next(); 4613 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4614 if (Method->isCopyAssignmentOperator()) 4615 continue; 4616 4617 F.erase(); 4618 } 4619 F.done(); 4620 4621 // Suppress the protected check (C++ [class.protected]) for each of the 4622 // assignment operators we found. This strange dance is required when 4623 // we're assigning via a base classes's copy-assignment operator. To 4624 // ensure that we're getting the right base class subobject (without 4625 // ambiguities), we need to cast "this" to that subobject type; to 4626 // ensure that we don't go through the virtual call mechanism, we need 4627 // to qualify the operator= name with the base class (see below). However, 4628 // this means that if the base class has a protected copy assignment 4629 // operator, the protected member access check will fail. So, we 4630 // rewrite "protected" access to "public" access in this case, since we 4631 // know by construction that we're calling from a derived class. 4632 if (CopyingBaseSubobject) { 4633 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4634 L != LEnd; ++L) { 4635 if (L.getAccess() == AS_protected) 4636 L.setAccess(AS_public); 4637 } 4638 } 4639 4640 // Create the nested-name-specifier that will be used to qualify the 4641 // reference to operator=; this is required to suppress the virtual 4642 // call mechanism. 4643 CXXScopeSpec SS; 4644 SS.setRange(Loc); 4645 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4646 T.getTypePtr())); 4647 4648 // Create the reference to operator=. 4649 ExprResult OpEqualRef 4650 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4651 /*FirstQualifierInScope=*/0, OpLookup, 4652 /*TemplateArgs=*/0, 4653 /*SuppressQualifierCheck=*/true); 4654 if (OpEqualRef.isInvalid()) 4655 return StmtError(); 4656 4657 // Build the call to the assignment operator. 4658 4659 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4660 OpEqualRef.takeAs<Expr>(), 4661 Loc, &From, 1, Loc); 4662 if (Call.isInvalid()) 4663 return StmtError(); 4664 4665 return S.Owned(Call.takeAs<Stmt>()); 4666 } 4667 4668 // - if the subobject is of scalar type, the built-in assignment 4669 // operator is used. 4670 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4671 if (!ArrayTy) { 4672 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4673 if (Assignment.isInvalid()) 4674 return StmtError(); 4675 4676 return S.Owned(Assignment.takeAs<Stmt>()); 4677 } 4678 4679 // - if the subobject is an array, each element is assigned, in the 4680 // manner appropriate to the element type; 4681 4682 // Construct a loop over the array bounds, e.g., 4683 // 4684 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4685 // 4686 // that will copy each of the array elements. 4687 QualType SizeType = S.Context.getSizeType(); 4688 4689 // Create the iteration variable. 4690 IdentifierInfo *IterationVarName = 0; 4691 { 4692 llvm::SmallString<8> Str; 4693 llvm::raw_svector_ostream OS(Str); 4694 OS << "__i" << Depth; 4695 IterationVarName = &S.Context.Idents.get(OS.str()); 4696 } 4697 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4698 IterationVarName, SizeType, 4699 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4700 SC_None, SC_None); 4701 4702 // Initialize the iteration variable to zero. 4703 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4704 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4705 4706 // Create a reference to the iteration variable; we'll use this several 4707 // times throughout. 4708 Expr *IterationVarRef 4709 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4710 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4711 4712 // Create the DeclStmt that holds the iteration variable. 4713 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4714 4715 // Create the comparison against the array bound. 4716 llvm::APInt Upper = ArrayTy->getSize(); 4717 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4718 Expr *Comparison 4719 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4720 IntegerLiteral::Create(S.Context, 4721 Upper, SizeType, Loc), 4722 BO_NE, S.Context.BoolTy, Loc); 4723 4724 // Create the pre-increment of the iteration variable. 4725 Expr *Increment 4726 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4727 UO_PreInc, 4728 SizeType, Loc); 4729 4730 // Subscript the "from" and "to" expressions with the iteration variable. 4731 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4732 IterationVarRef, Loc)); 4733 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4734 IterationVarRef, Loc)); 4735 4736 // Build the copy for an individual element of the array. 4737 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4738 ArrayTy->getElementType(), 4739 To, From, 4740 CopyingBaseSubobject, Depth+1); 4741 if (Copy.isInvalid()) 4742 return StmtError(); 4743 4744 // Construct the loop that copies all elements of this array. 4745 return S.ActOnForStmt(Loc, Loc, InitStmt, 4746 S.MakeFullExpr(Comparison), 4747 0, S.MakeFullExpr(Increment), 4748 Loc, Copy.take()); 4749} 4750 4751/// \brief Determine whether the given class has a copy assignment operator 4752/// that accepts a const-qualified argument. 4753static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4754 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4755 4756 if (!Class->hasDeclaredCopyAssignment()) 4757 S.DeclareImplicitCopyAssignment(Class); 4758 4759 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4760 DeclarationName OpName 4761 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4762 4763 DeclContext::lookup_const_iterator Op, OpEnd; 4764 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4765 // C++ [class.copy]p9: 4766 // A user-declared copy assignment operator is a non-static non-template 4767 // member function of class X with exactly one parameter of type X, X&, 4768 // const X&, volatile X& or const volatile X&. 4769 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4770 if (!Method) 4771 continue; 4772 4773 if (Method->isStatic()) 4774 continue; 4775 if (Method->getPrimaryTemplate()) 4776 continue; 4777 const FunctionProtoType *FnType = 4778 Method->getType()->getAs<FunctionProtoType>(); 4779 assert(FnType && "Overloaded operator has no prototype."); 4780 // Don't assert on this; an invalid decl might have been left in the AST. 4781 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4782 continue; 4783 bool AcceptsConst = true; 4784 QualType ArgType = FnType->getArgType(0); 4785 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4786 ArgType = Ref->getPointeeType(); 4787 // Is it a non-const lvalue reference? 4788 if (!ArgType.isConstQualified()) 4789 AcceptsConst = false; 4790 } 4791 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4792 continue; 4793 4794 // We have a single argument of type cv X or cv X&, i.e. we've found the 4795 // copy assignment operator. Return whether it accepts const arguments. 4796 return AcceptsConst; 4797 } 4798 assert(Class->isInvalidDecl() && 4799 "No copy assignment operator declared in valid code."); 4800 return false; 4801} 4802 4803CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4804 // Note: The following rules are largely analoguous to the copy 4805 // constructor rules. Note that virtual bases are not taken into account 4806 // for determining the argument type of the operator. Note also that 4807 // operators taking an object instead of a reference are allowed. 4808 4809 4810 // C++ [class.copy]p10: 4811 // If the class definition does not explicitly declare a copy 4812 // assignment operator, one is declared implicitly. 4813 // The implicitly-defined copy assignment operator for a class X 4814 // will have the form 4815 // 4816 // X& X::operator=(const X&) 4817 // 4818 // if 4819 bool HasConstCopyAssignment = true; 4820 4821 // -- each direct base class B of X has a copy assignment operator 4822 // whose parameter is of type const B&, const volatile B& or B, 4823 // and 4824 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4825 BaseEnd = ClassDecl->bases_end(); 4826 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4827 assert(!Base->getType()->isDependentType() && 4828 "Cannot generate implicit members for class with dependent bases."); 4829 const CXXRecordDecl *BaseClassDecl 4830 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4831 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4832 } 4833 4834 // -- for all the nonstatic data members of X that are of a class 4835 // type M (or array thereof), each such class type has a copy 4836 // assignment operator whose parameter is of type const M&, 4837 // const volatile M& or M. 4838 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4839 FieldEnd = ClassDecl->field_end(); 4840 HasConstCopyAssignment && Field != FieldEnd; 4841 ++Field) { 4842 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4843 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4844 const CXXRecordDecl *FieldClassDecl 4845 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4846 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4847 } 4848 } 4849 4850 // Otherwise, the implicitly declared copy assignment operator will 4851 // have the form 4852 // 4853 // X& X::operator=(X&) 4854 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4855 QualType RetType = Context.getLValueReferenceType(ArgType); 4856 if (HasConstCopyAssignment) 4857 ArgType = ArgType.withConst(); 4858 ArgType = Context.getLValueReferenceType(ArgType); 4859 4860 // C++ [except.spec]p14: 4861 // An implicitly declared special member function (Clause 12) shall have an 4862 // exception-specification. [...] 4863 ImplicitExceptionSpecification ExceptSpec(Context); 4864 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4865 BaseEnd = ClassDecl->bases_end(); 4866 Base != BaseEnd; ++Base) { 4867 CXXRecordDecl *BaseClassDecl 4868 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4869 4870 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4871 DeclareImplicitCopyAssignment(BaseClassDecl); 4872 4873 if (CXXMethodDecl *CopyAssign 4874 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4875 ExceptSpec.CalledDecl(CopyAssign); 4876 } 4877 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4878 FieldEnd = ClassDecl->field_end(); 4879 Field != FieldEnd; 4880 ++Field) { 4881 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4882 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4883 CXXRecordDecl *FieldClassDecl 4884 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4885 4886 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4887 DeclareImplicitCopyAssignment(FieldClassDecl); 4888 4889 if (CXXMethodDecl *CopyAssign 4890 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4891 ExceptSpec.CalledDecl(CopyAssign); 4892 } 4893 } 4894 4895 // An implicitly-declared copy assignment operator is an inline public 4896 // member of its class. 4897 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4898 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4899 CXXMethodDecl *CopyAssignment 4900 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4901 Context.getFunctionType(RetType, &ArgType, 1, 4902 false, 0, 4903 ExceptSpec.hasExceptionSpecification(), 4904 ExceptSpec.hasAnyExceptionSpecification(), 4905 ExceptSpec.size(), 4906 ExceptSpec.data(), 4907 FunctionType::ExtInfo()), 4908 /*TInfo=*/0, /*isStatic=*/false, 4909 /*StorageClassAsWritten=*/SC_None, 4910 /*isInline=*/true); 4911 CopyAssignment->setAccess(AS_public); 4912 CopyAssignment->setImplicit(); 4913 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4914 4915 // Add the parameter to the operator. 4916 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4917 ClassDecl->getLocation(), 4918 /*Id=*/0, 4919 ArgType, /*TInfo=*/0, 4920 SC_None, 4921 SC_None, 0); 4922 CopyAssignment->setParams(&FromParam, 1); 4923 4924 // Note that we have added this copy-assignment operator. 4925 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4926 4927 if (Scope *S = getScopeForContext(ClassDecl)) 4928 PushOnScopeChains(CopyAssignment, S, false); 4929 ClassDecl->addDecl(CopyAssignment); 4930 4931 AddOverriddenMethods(ClassDecl, CopyAssignment); 4932 return CopyAssignment; 4933} 4934 4935void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4936 CXXMethodDecl *CopyAssignOperator) { 4937 assert((CopyAssignOperator->isImplicit() && 4938 CopyAssignOperator->isOverloadedOperator() && 4939 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4940 !CopyAssignOperator->isUsed(false)) && 4941 "DefineImplicitCopyAssignment called for wrong function"); 4942 4943 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4944 4945 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4946 CopyAssignOperator->setInvalidDecl(); 4947 return; 4948 } 4949 4950 CopyAssignOperator->setUsed(); 4951 4952 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4953 ErrorTrap Trap(*this); 4954 4955 // C++0x [class.copy]p30: 4956 // The implicitly-defined or explicitly-defaulted copy assignment operator 4957 // for a non-union class X performs memberwise copy assignment of its 4958 // subobjects. The direct base classes of X are assigned first, in the 4959 // order of their declaration in the base-specifier-list, and then the 4960 // immediate non-static data members of X are assigned, in the order in 4961 // which they were declared in the class definition. 4962 4963 // The statements that form the synthesized function body. 4964 ASTOwningVector<Stmt*> Statements(*this); 4965 4966 // The parameter for the "other" object, which we are copying from. 4967 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4968 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4969 QualType OtherRefType = Other->getType(); 4970 if (const LValueReferenceType *OtherRef 4971 = OtherRefType->getAs<LValueReferenceType>()) { 4972 OtherRefType = OtherRef->getPointeeType(); 4973 OtherQuals = OtherRefType.getQualifiers(); 4974 } 4975 4976 // Our location for everything implicitly-generated. 4977 SourceLocation Loc = CopyAssignOperator->getLocation(); 4978 4979 // Construct a reference to the "other" object. We'll be using this 4980 // throughout the generated ASTs. 4981 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4982 assert(OtherRef && "Reference to parameter cannot fail!"); 4983 4984 // Construct the "this" pointer. We'll be using this throughout the generated 4985 // ASTs. 4986 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4987 assert(This && "Reference to this cannot fail!"); 4988 4989 // Assign base classes. 4990 bool Invalid = false; 4991 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4992 E = ClassDecl->bases_end(); Base != E; ++Base) { 4993 // Form the assignment: 4994 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4995 QualType BaseType = Base->getType().getUnqualifiedType(); 4996 CXXRecordDecl *BaseClassDecl = 0; 4997 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4998 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4999 else { 5000 Invalid = true; 5001 continue; 5002 } 5003 5004 CXXCastPath BasePath; 5005 BasePath.push_back(Base); 5006 5007 // Construct the "from" expression, which is an implicit cast to the 5008 // appropriately-qualified base type. 5009 Expr *From = OtherRef->Retain(); 5010 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5011 CK_UncheckedDerivedToBase, 5012 VK_LValue, &BasePath); 5013 5014 // Dereference "this". 5015 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5016 5017 // Implicitly cast "this" to the appropriately-qualified base type. 5018 Expr *ToE = To.takeAs<Expr>(); 5019 ImpCastExprToType(ToE, 5020 Context.getCVRQualifiedType(BaseType, 5021 CopyAssignOperator->getTypeQualifiers()), 5022 CK_UncheckedDerivedToBase, 5023 VK_LValue, &BasePath); 5024 To = Owned(ToE); 5025 5026 // Build the copy. 5027 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5028 To.get(), From, 5029 /*CopyingBaseSubobject=*/true); 5030 if (Copy.isInvalid()) { 5031 Diag(CurrentLocation, diag::note_member_synthesized_at) 5032 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5033 CopyAssignOperator->setInvalidDecl(); 5034 return; 5035 } 5036 5037 // Success! Record the copy. 5038 Statements.push_back(Copy.takeAs<Expr>()); 5039 } 5040 5041 // \brief Reference to the __builtin_memcpy function. 5042 Expr *BuiltinMemCpyRef = 0; 5043 // \brief Reference to the __builtin_objc_memmove_collectable function. 5044 Expr *CollectableMemCpyRef = 0; 5045 5046 // Assign non-static members. 5047 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5048 FieldEnd = ClassDecl->field_end(); 5049 Field != FieldEnd; ++Field) { 5050 // Check for members of reference type; we can't copy those. 5051 if (Field->getType()->isReferenceType()) { 5052 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5053 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5054 Diag(Field->getLocation(), diag::note_declared_at); 5055 Diag(CurrentLocation, diag::note_member_synthesized_at) 5056 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5057 Invalid = true; 5058 continue; 5059 } 5060 5061 // Check for members of const-qualified, non-class type. 5062 QualType BaseType = Context.getBaseElementType(Field->getType()); 5063 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5064 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5065 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5066 Diag(Field->getLocation(), diag::note_declared_at); 5067 Diag(CurrentLocation, diag::note_member_synthesized_at) 5068 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5069 Invalid = true; 5070 continue; 5071 } 5072 5073 QualType FieldType = Field->getType().getNonReferenceType(); 5074 if (FieldType->isIncompleteArrayType()) { 5075 assert(ClassDecl->hasFlexibleArrayMember() && 5076 "Incomplete array type is not valid"); 5077 continue; 5078 } 5079 5080 // Build references to the field in the object we're copying from and to. 5081 CXXScopeSpec SS; // Intentionally empty 5082 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5083 LookupMemberName); 5084 MemberLookup.addDecl(*Field); 5085 MemberLookup.resolveKind(); 5086 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5087 Loc, /*IsArrow=*/false, 5088 SS, 0, MemberLookup, 0); 5089 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5090 Loc, /*IsArrow=*/true, 5091 SS, 0, MemberLookup, 0); 5092 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5093 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5094 5095 // If the field should be copied with __builtin_memcpy rather than via 5096 // explicit assignments, do so. This optimization only applies for arrays 5097 // of scalars and arrays of class type with trivial copy-assignment 5098 // operators. 5099 if (FieldType->isArrayType() && 5100 (!BaseType->isRecordType() || 5101 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5102 ->hasTrivialCopyAssignment())) { 5103 // Compute the size of the memory buffer to be copied. 5104 QualType SizeType = Context.getSizeType(); 5105 llvm::APInt Size(Context.getTypeSize(SizeType), 5106 Context.getTypeSizeInChars(BaseType).getQuantity()); 5107 for (const ConstantArrayType *Array 5108 = Context.getAsConstantArrayType(FieldType); 5109 Array; 5110 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5111 llvm::APInt ArraySize = Array->getSize(); 5112 ArraySize.zextOrTrunc(Size.getBitWidth()); 5113 Size *= ArraySize; 5114 } 5115 5116 // Take the address of the field references for "from" and "to". 5117 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5118 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5119 5120 bool NeedsCollectableMemCpy = 5121 (BaseType->isRecordType() && 5122 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5123 5124 if (NeedsCollectableMemCpy) { 5125 if (!CollectableMemCpyRef) { 5126 // Create a reference to the __builtin_objc_memmove_collectable function. 5127 LookupResult R(*this, 5128 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5129 Loc, LookupOrdinaryName); 5130 LookupName(R, TUScope, true); 5131 5132 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5133 if (!CollectableMemCpy) { 5134 // Something went horribly wrong earlier, and we will have 5135 // complained about it. 5136 Invalid = true; 5137 continue; 5138 } 5139 5140 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5141 CollectableMemCpy->getType(), 5142 Loc, 0).takeAs<Expr>(); 5143 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5144 } 5145 } 5146 // Create a reference to the __builtin_memcpy builtin function. 5147 else if (!BuiltinMemCpyRef) { 5148 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5149 LookupOrdinaryName); 5150 LookupName(R, TUScope, true); 5151 5152 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5153 if (!BuiltinMemCpy) { 5154 // Something went horribly wrong earlier, and we will have complained 5155 // about it. 5156 Invalid = true; 5157 continue; 5158 } 5159 5160 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5161 BuiltinMemCpy->getType(), 5162 Loc, 0).takeAs<Expr>(); 5163 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5164 } 5165 5166 ASTOwningVector<Expr*> CallArgs(*this); 5167 CallArgs.push_back(To.takeAs<Expr>()); 5168 CallArgs.push_back(From.takeAs<Expr>()); 5169 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5170 ExprResult Call = ExprError(); 5171 if (NeedsCollectableMemCpy) 5172 Call = ActOnCallExpr(/*Scope=*/0, 5173 CollectableMemCpyRef, 5174 Loc, move_arg(CallArgs), 5175 Loc); 5176 else 5177 Call = ActOnCallExpr(/*Scope=*/0, 5178 BuiltinMemCpyRef, 5179 Loc, move_arg(CallArgs), 5180 Loc); 5181 5182 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5183 Statements.push_back(Call.takeAs<Expr>()); 5184 continue; 5185 } 5186 5187 // Build the copy of this field. 5188 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5189 To.get(), From.get(), 5190 /*CopyingBaseSubobject=*/false); 5191 if (Copy.isInvalid()) { 5192 Diag(CurrentLocation, diag::note_member_synthesized_at) 5193 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5194 CopyAssignOperator->setInvalidDecl(); 5195 return; 5196 } 5197 5198 // Success! Record the copy. 5199 Statements.push_back(Copy.takeAs<Stmt>()); 5200 } 5201 5202 if (!Invalid) { 5203 // Add a "return *this;" 5204 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5205 5206 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5207 if (Return.isInvalid()) 5208 Invalid = true; 5209 else { 5210 Statements.push_back(Return.takeAs<Stmt>()); 5211 5212 if (Trap.hasErrorOccurred()) { 5213 Diag(CurrentLocation, diag::note_member_synthesized_at) 5214 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5215 Invalid = true; 5216 } 5217 } 5218 } 5219 5220 if (Invalid) { 5221 CopyAssignOperator->setInvalidDecl(); 5222 return; 5223 } 5224 5225 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5226 /*isStmtExpr=*/false); 5227 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5228 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5229} 5230 5231CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5232 CXXRecordDecl *ClassDecl) { 5233 // C++ [class.copy]p4: 5234 // If the class definition does not explicitly declare a copy 5235 // constructor, one is declared implicitly. 5236 5237 // C++ [class.copy]p5: 5238 // The implicitly-declared copy constructor for a class X will 5239 // have the form 5240 // 5241 // X::X(const X&) 5242 // 5243 // if 5244 bool HasConstCopyConstructor = true; 5245 5246 // -- each direct or virtual base class B of X has a copy 5247 // constructor whose first parameter is of type const B& or 5248 // const volatile B&, and 5249 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5250 BaseEnd = ClassDecl->bases_end(); 5251 HasConstCopyConstructor && Base != BaseEnd; 5252 ++Base) { 5253 // Virtual bases are handled below. 5254 if (Base->isVirtual()) 5255 continue; 5256 5257 CXXRecordDecl *BaseClassDecl 5258 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5259 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5260 DeclareImplicitCopyConstructor(BaseClassDecl); 5261 5262 HasConstCopyConstructor 5263 = BaseClassDecl->hasConstCopyConstructor(Context); 5264 } 5265 5266 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5267 BaseEnd = ClassDecl->vbases_end(); 5268 HasConstCopyConstructor && Base != BaseEnd; 5269 ++Base) { 5270 CXXRecordDecl *BaseClassDecl 5271 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5272 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5273 DeclareImplicitCopyConstructor(BaseClassDecl); 5274 5275 HasConstCopyConstructor 5276 = BaseClassDecl->hasConstCopyConstructor(Context); 5277 } 5278 5279 // -- for all the nonstatic data members of X that are of a 5280 // class type M (or array thereof), each such class type 5281 // has a copy constructor whose first parameter is of type 5282 // const M& or const volatile M&. 5283 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5284 FieldEnd = ClassDecl->field_end(); 5285 HasConstCopyConstructor && Field != FieldEnd; 5286 ++Field) { 5287 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5288 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5289 CXXRecordDecl *FieldClassDecl 5290 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5291 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5292 DeclareImplicitCopyConstructor(FieldClassDecl); 5293 5294 HasConstCopyConstructor 5295 = FieldClassDecl->hasConstCopyConstructor(Context); 5296 } 5297 } 5298 5299 // Otherwise, the implicitly declared copy constructor will have 5300 // the form 5301 // 5302 // X::X(X&) 5303 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5304 QualType ArgType = ClassType; 5305 if (HasConstCopyConstructor) 5306 ArgType = ArgType.withConst(); 5307 ArgType = Context.getLValueReferenceType(ArgType); 5308 5309 // C++ [except.spec]p14: 5310 // An implicitly declared special member function (Clause 12) shall have an 5311 // exception-specification. [...] 5312 ImplicitExceptionSpecification ExceptSpec(Context); 5313 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5314 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5315 BaseEnd = ClassDecl->bases_end(); 5316 Base != BaseEnd; 5317 ++Base) { 5318 // Virtual bases are handled below. 5319 if (Base->isVirtual()) 5320 continue; 5321 5322 CXXRecordDecl *BaseClassDecl 5323 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5324 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5325 DeclareImplicitCopyConstructor(BaseClassDecl); 5326 5327 if (CXXConstructorDecl *CopyConstructor 5328 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5329 ExceptSpec.CalledDecl(CopyConstructor); 5330 } 5331 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5332 BaseEnd = ClassDecl->vbases_end(); 5333 Base != BaseEnd; 5334 ++Base) { 5335 CXXRecordDecl *BaseClassDecl 5336 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5337 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5338 DeclareImplicitCopyConstructor(BaseClassDecl); 5339 5340 if (CXXConstructorDecl *CopyConstructor 5341 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5342 ExceptSpec.CalledDecl(CopyConstructor); 5343 } 5344 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5345 FieldEnd = ClassDecl->field_end(); 5346 Field != FieldEnd; 5347 ++Field) { 5348 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5349 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5350 CXXRecordDecl *FieldClassDecl 5351 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5352 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5353 DeclareImplicitCopyConstructor(FieldClassDecl); 5354 5355 if (CXXConstructorDecl *CopyConstructor 5356 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5357 ExceptSpec.CalledDecl(CopyConstructor); 5358 } 5359 } 5360 5361 // An implicitly-declared copy constructor is an inline public 5362 // member of its class. 5363 DeclarationName Name 5364 = Context.DeclarationNames.getCXXConstructorName( 5365 Context.getCanonicalType(ClassType)); 5366 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5367 CXXConstructorDecl *CopyConstructor 5368 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5369 Context.getFunctionType(Context.VoidTy, 5370 &ArgType, 1, 5371 false, 0, 5372 ExceptSpec.hasExceptionSpecification(), 5373 ExceptSpec.hasAnyExceptionSpecification(), 5374 ExceptSpec.size(), 5375 ExceptSpec.data(), 5376 FunctionType::ExtInfo()), 5377 /*TInfo=*/0, 5378 /*isExplicit=*/false, 5379 /*isInline=*/true, 5380 /*isImplicitlyDeclared=*/true); 5381 CopyConstructor->setAccess(AS_public); 5382 CopyConstructor->setImplicit(); 5383 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5384 5385 // Note that we have declared this constructor. 5386 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5387 5388 // Add the parameter to the constructor. 5389 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5390 ClassDecl->getLocation(), 5391 /*IdentifierInfo=*/0, 5392 ArgType, /*TInfo=*/0, 5393 SC_None, 5394 SC_None, 0); 5395 CopyConstructor->setParams(&FromParam, 1); 5396 if (Scope *S = getScopeForContext(ClassDecl)) 5397 PushOnScopeChains(CopyConstructor, S, false); 5398 ClassDecl->addDecl(CopyConstructor); 5399 5400 return CopyConstructor; 5401} 5402 5403void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5404 CXXConstructorDecl *CopyConstructor, 5405 unsigned TypeQuals) { 5406 assert((CopyConstructor->isImplicit() && 5407 CopyConstructor->isCopyConstructor(TypeQuals) && 5408 !CopyConstructor->isUsed(false)) && 5409 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5410 5411 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5412 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5413 5414 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5415 ErrorTrap Trap(*this); 5416 5417 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5418 Trap.hasErrorOccurred()) { 5419 Diag(CurrentLocation, diag::note_member_synthesized_at) 5420 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5421 CopyConstructor->setInvalidDecl(); 5422 } else { 5423 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5424 CopyConstructor->getLocation(), 5425 MultiStmtArg(*this, 0, 0), 5426 /*isStmtExpr=*/false) 5427 .takeAs<Stmt>()); 5428 } 5429 5430 CopyConstructor->setUsed(); 5431} 5432 5433ExprResult 5434Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5435 CXXConstructorDecl *Constructor, 5436 MultiExprArg ExprArgs, 5437 bool RequiresZeroInit, 5438 unsigned ConstructKind) { 5439 bool Elidable = false; 5440 5441 // C++0x [class.copy]p34: 5442 // When certain criteria are met, an implementation is allowed to 5443 // omit the copy/move construction of a class object, even if the 5444 // copy/move constructor and/or destructor for the object have 5445 // side effects. [...] 5446 // - when a temporary class object that has not been bound to a 5447 // reference (12.2) would be copied/moved to a class object 5448 // with the same cv-unqualified type, the copy/move operation 5449 // can be omitted by constructing the temporary object 5450 // directly into the target of the omitted copy/move 5451 if (ConstructKind == CXXConstructExpr::CK_Complete && 5452 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5453 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5454 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5455 } 5456 5457 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5458 Elidable, move(ExprArgs), RequiresZeroInit, 5459 ConstructKind); 5460} 5461 5462/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5463/// including handling of its default argument expressions. 5464ExprResult 5465Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5466 CXXConstructorDecl *Constructor, bool Elidable, 5467 MultiExprArg ExprArgs, 5468 bool RequiresZeroInit, 5469 unsigned ConstructKind) { 5470 unsigned NumExprs = ExprArgs.size(); 5471 Expr **Exprs = (Expr **)ExprArgs.release(); 5472 5473 MarkDeclarationReferenced(ConstructLoc, Constructor); 5474 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5475 Constructor, Elidable, Exprs, NumExprs, 5476 RequiresZeroInit, 5477 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5478} 5479 5480bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5481 CXXConstructorDecl *Constructor, 5482 MultiExprArg Exprs) { 5483 ExprResult TempResult = 5484 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5485 move(Exprs), false, CXXConstructExpr::CK_Complete); 5486 if (TempResult.isInvalid()) 5487 return true; 5488 5489 Expr *Temp = TempResult.takeAs<Expr>(); 5490 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5491 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5492 VD->setInit(Temp); 5493 5494 return false; 5495} 5496 5497void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5498 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5499 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5500 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5501 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5502 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5503 CheckDestructorAccess(VD->getLocation(), Destructor, 5504 PDiag(diag::err_access_dtor_var) 5505 << VD->getDeclName() 5506 << VD->getType()); 5507 5508 // TODO: this should be re-enabled for static locals by !CXAAtExit 5509 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5510 Diag(VD->getLocation(), diag::warn_global_destructor); 5511 } 5512} 5513 5514/// AddCXXDirectInitializerToDecl - This action is called immediately after 5515/// ActOnDeclarator, when a C++ direct initializer is present. 5516/// e.g: "int x(1);" 5517void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5518 SourceLocation LParenLoc, 5519 MultiExprArg Exprs, 5520 SourceLocation RParenLoc) { 5521 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5522 5523 // If there is no declaration, there was an error parsing it. Just ignore 5524 // the initializer. 5525 if (RealDecl == 0) 5526 return; 5527 5528 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5529 if (!VDecl) { 5530 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5531 RealDecl->setInvalidDecl(); 5532 return; 5533 } 5534 5535 // We will represent direct-initialization similarly to copy-initialization: 5536 // int x(1); -as-> int x = 1; 5537 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5538 // 5539 // Clients that want to distinguish between the two forms, can check for 5540 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5541 // A major benefit is that clients that don't particularly care about which 5542 // exactly form was it (like the CodeGen) can handle both cases without 5543 // special case code. 5544 5545 // C++ 8.5p11: 5546 // The form of initialization (using parentheses or '=') is generally 5547 // insignificant, but does matter when the entity being initialized has a 5548 // class type. 5549 5550 if (!VDecl->getType()->isDependentType() && 5551 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5552 diag::err_typecheck_decl_incomplete_type)) { 5553 VDecl->setInvalidDecl(); 5554 return; 5555 } 5556 5557 // The variable can not have an abstract class type. 5558 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5559 diag::err_abstract_type_in_decl, 5560 AbstractVariableType)) 5561 VDecl->setInvalidDecl(); 5562 5563 const VarDecl *Def; 5564 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5565 Diag(VDecl->getLocation(), diag::err_redefinition) 5566 << VDecl->getDeclName(); 5567 Diag(Def->getLocation(), diag::note_previous_definition); 5568 VDecl->setInvalidDecl(); 5569 return; 5570 } 5571 5572 // C++ [class.static.data]p4 5573 // If a static data member is of const integral or const 5574 // enumeration type, its declaration in the class definition can 5575 // specify a constant-initializer which shall be an integral 5576 // constant expression (5.19). In that case, the member can appear 5577 // in integral constant expressions. The member shall still be 5578 // defined in a namespace scope if it is used in the program and the 5579 // namespace scope definition shall not contain an initializer. 5580 // 5581 // We already performed a redefinition check above, but for static 5582 // data members we also need to check whether there was an in-class 5583 // declaration with an initializer. 5584 const VarDecl* PrevInit = 0; 5585 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5586 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5587 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5588 return; 5589 } 5590 5591 // If either the declaration has a dependent type or if any of the 5592 // expressions is type-dependent, we represent the initialization 5593 // via a ParenListExpr for later use during template instantiation. 5594 if (VDecl->getType()->isDependentType() || 5595 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5596 // Let clients know that initialization was done with a direct initializer. 5597 VDecl->setCXXDirectInitializer(true); 5598 5599 // Store the initialization expressions as a ParenListExpr. 5600 unsigned NumExprs = Exprs.size(); 5601 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5602 (Expr **)Exprs.release(), 5603 NumExprs, RParenLoc)); 5604 return; 5605 } 5606 5607 // Capture the variable that is being initialized and the style of 5608 // initialization. 5609 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5610 5611 // FIXME: Poor source location information. 5612 InitializationKind Kind 5613 = InitializationKind::CreateDirect(VDecl->getLocation(), 5614 LParenLoc, RParenLoc); 5615 5616 InitializationSequence InitSeq(*this, Entity, Kind, 5617 Exprs.get(), Exprs.size()); 5618 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5619 if (Result.isInvalid()) { 5620 VDecl->setInvalidDecl(); 5621 return; 5622 } 5623 5624 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5625 VDecl->setInit(Result.takeAs<Expr>()); 5626 VDecl->setCXXDirectInitializer(true); 5627 5628 if (!VDecl->isInvalidDecl() && 5629 !VDecl->getDeclContext()->isDependentContext() && 5630 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5631 !VDecl->getInit()->isConstantInitializer(Context, 5632 VDecl->getType()->isReferenceType())) 5633 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5634 << VDecl->getInit()->getSourceRange(); 5635 5636 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5637 FinalizeVarWithDestructor(VDecl, Record); 5638} 5639 5640/// \brief Given a constructor and the set of arguments provided for the 5641/// constructor, convert the arguments and add any required default arguments 5642/// to form a proper call to this constructor. 5643/// 5644/// \returns true if an error occurred, false otherwise. 5645bool 5646Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5647 MultiExprArg ArgsPtr, 5648 SourceLocation Loc, 5649 ASTOwningVector<Expr*> &ConvertedArgs) { 5650 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5651 unsigned NumArgs = ArgsPtr.size(); 5652 Expr **Args = (Expr **)ArgsPtr.get(); 5653 5654 const FunctionProtoType *Proto 5655 = Constructor->getType()->getAs<FunctionProtoType>(); 5656 assert(Proto && "Constructor without a prototype?"); 5657 unsigned NumArgsInProto = Proto->getNumArgs(); 5658 5659 // If too few arguments are available, we'll fill in the rest with defaults. 5660 if (NumArgs < NumArgsInProto) 5661 ConvertedArgs.reserve(NumArgsInProto); 5662 else 5663 ConvertedArgs.reserve(NumArgs); 5664 5665 VariadicCallType CallType = 5666 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5667 llvm::SmallVector<Expr *, 8> AllArgs; 5668 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5669 Proto, 0, Args, NumArgs, AllArgs, 5670 CallType); 5671 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5672 ConvertedArgs.push_back(AllArgs[i]); 5673 return Invalid; 5674} 5675 5676static inline bool 5677CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5678 const FunctionDecl *FnDecl) { 5679 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5680 if (isa<NamespaceDecl>(DC)) { 5681 return SemaRef.Diag(FnDecl->getLocation(), 5682 diag::err_operator_new_delete_declared_in_namespace) 5683 << FnDecl->getDeclName(); 5684 } 5685 5686 if (isa<TranslationUnitDecl>(DC) && 5687 FnDecl->getStorageClass() == SC_Static) { 5688 return SemaRef.Diag(FnDecl->getLocation(), 5689 diag::err_operator_new_delete_declared_static) 5690 << FnDecl->getDeclName(); 5691 } 5692 5693 return false; 5694} 5695 5696static inline bool 5697CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5698 CanQualType ExpectedResultType, 5699 CanQualType ExpectedFirstParamType, 5700 unsigned DependentParamTypeDiag, 5701 unsigned InvalidParamTypeDiag) { 5702 QualType ResultType = 5703 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5704 5705 // Check that the result type is not dependent. 5706 if (ResultType->isDependentType()) 5707 return SemaRef.Diag(FnDecl->getLocation(), 5708 diag::err_operator_new_delete_dependent_result_type) 5709 << FnDecl->getDeclName() << ExpectedResultType; 5710 5711 // Check that the result type is what we expect. 5712 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5713 return SemaRef.Diag(FnDecl->getLocation(), 5714 diag::err_operator_new_delete_invalid_result_type) 5715 << FnDecl->getDeclName() << ExpectedResultType; 5716 5717 // A function template must have at least 2 parameters. 5718 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5719 return SemaRef.Diag(FnDecl->getLocation(), 5720 diag::err_operator_new_delete_template_too_few_parameters) 5721 << FnDecl->getDeclName(); 5722 5723 // The function decl must have at least 1 parameter. 5724 if (FnDecl->getNumParams() == 0) 5725 return SemaRef.Diag(FnDecl->getLocation(), 5726 diag::err_operator_new_delete_too_few_parameters) 5727 << FnDecl->getDeclName(); 5728 5729 // Check the the first parameter type is not dependent. 5730 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5731 if (FirstParamType->isDependentType()) 5732 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5733 << FnDecl->getDeclName() << ExpectedFirstParamType; 5734 5735 // Check that the first parameter type is what we expect. 5736 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5737 ExpectedFirstParamType) 5738 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5739 << FnDecl->getDeclName() << ExpectedFirstParamType; 5740 5741 return false; 5742} 5743 5744static bool 5745CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5746 // C++ [basic.stc.dynamic.allocation]p1: 5747 // A program is ill-formed if an allocation function is declared in a 5748 // namespace scope other than global scope or declared static in global 5749 // scope. 5750 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5751 return true; 5752 5753 CanQualType SizeTy = 5754 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5755 5756 // C++ [basic.stc.dynamic.allocation]p1: 5757 // The return type shall be void*. The first parameter shall have type 5758 // std::size_t. 5759 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5760 SizeTy, 5761 diag::err_operator_new_dependent_param_type, 5762 diag::err_operator_new_param_type)) 5763 return true; 5764 5765 // C++ [basic.stc.dynamic.allocation]p1: 5766 // The first parameter shall not have an associated default argument. 5767 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5768 return SemaRef.Diag(FnDecl->getLocation(), 5769 diag::err_operator_new_default_arg) 5770 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5771 5772 return false; 5773} 5774 5775static bool 5776CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5777 // C++ [basic.stc.dynamic.deallocation]p1: 5778 // A program is ill-formed if deallocation functions are declared in a 5779 // namespace scope other than global scope or declared static in global 5780 // scope. 5781 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5782 return true; 5783 5784 // C++ [basic.stc.dynamic.deallocation]p2: 5785 // Each deallocation function shall return void and its first parameter 5786 // shall be void*. 5787 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5788 SemaRef.Context.VoidPtrTy, 5789 diag::err_operator_delete_dependent_param_type, 5790 diag::err_operator_delete_param_type)) 5791 return true; 5792 5793 return false; 5794} 5795 5796/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5797/// of this overloaded operator is well-formed. If so, returns false; 5798/// otherwise, emits appropriate diagnostics and returns true. 5799bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5800 assert(FnDecl && FnDecl->isOverloadedOperator() && 5801 "Expected an overloaded operator declaration"); 5802 5803 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5804 5805 // C++ [over.oper]p5: 5806 // The allocation and deallocation functions, operator new, 5807 // operator new[], operator delete and operator delete[], are 5808 // described completely in 3.7.3. The attributes and restrictions 5809 // found in the rest of this subclause do not apply to them unless 5810 // explicitly stated in 3.7.3. 5811 if (Op == OO_Delete || Op == OO_Array_Delete) 5812 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5813 5814 if (Op == OO_New || Op == OO_Array_New) 5815 return CheckOperatorNewDeclaration(*this, FnDecl); 5816 5817 // C++ [over.oper]p6: 5818 // An operator function shall either be a non-static member 5819 // function or be a non-member function and have at least one 5820 // parameter whose type is a class, a reference to a class, an 5821 // enumeration, or a reference to an enumeration. 5822 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5823 if (MethodDecl->isStatic()) 5824 return Diag(FnDecl->getLocation(), 5825 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5826 } else { 5827 bool ClassOrEnumParam = false; 5828 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5829 ParamEnd = FnDecl->param_end(); 5830 Param != ParamEnd; ++Param) { 5831 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5832 if (ParamType->isDependentType() || ParamType->isRecordType() || 5833 ParamType->isEnumeralType()) { 5834 ClassOrEnumParam = true; 5835 break; 5836 } 5837 } 5838 5839 if (!ClassOrEnumParam) 5840 return Diag(FnDecl->getLocation(), 5841 diag::err_operator_overload_needs_class_or_enum) 5842 << FnDecl->getDeclName(); 5843 } 5844 5845 // C++ [over.oper]p8: 5846 // An operator function cannot have default arguments (8.3.6), 5847 // except where explicitly stated below. 5848 // 5849 // Only the function-call operator allows default arguments 5850 // (C++ [over.call]p1). 5851 if (Op != OO_Call) { 5852 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5853 Param != FnDecl->param_end(); ++Param) { 5854 if ((*Param)->hasDefaultArg()) 5855 return Diag((*Param)->getLocation(), 5856 diag::err_operator_overload_default_arg) 5857 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5858 } 5859 } 5860 5861 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5862 { false, false, false } 5863#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5864 , { Unary, Binary, MemberOnly } 5865#include "clang/Basic/OperatorKinds.def" 5866 }; 5867 5868 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5869 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5870 bool MustBeMemberOperator = OperatorUses[Op][2]; 5871 5872 // C++ [over.oper]p8: 5873 // [...] Operator functions cannot have more or fewer parameters 5874 // than the number required for the corresponding operator, as 5875 // described in the rest of this subclause. 5876 unsigned NumParams = FnDecl->getNumParams() 5877 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5878 if (Op != OO_Call && 5879 ((NumParams == 1 && !CanBeUnaryOperator) || 5880 (NumParams == 2 && !CanBeBinaryOperator) || 5881 (NumParams < 1) || (NumParams > 2))) { 5882 // We have the wrong number of parameters. 5883 unsigned ErrorKind; 5884 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5885 ErrorKind = 2; // 2 -> unary or binary. 5886 } else if (CanBeUnaryOperator) { 5887 ErrorKind = 0; // 0 -> unary 5888 } else { 5889 assert(CanBeBinaryOperator && 5890 "All non-call overloaded operators are unary or binary!"); 5891 ErrorKind = 1; // 1 -> binary 5892 } 5893 5894 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5895 << FnDecl->getDeclName() << NumParams << ErrorKind; 5896 } 5897 5898 // Overloaded operators other than operator() cannot be variadic. 5899 if (Op != OO_Call && 5900 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5901 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5902 << FnDecl->getDeclName(); 5903 } 5904 5905 // Some operators must be non-static member functions. 5906 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5907 return Diag(FnDecl->getLocation(), 5908 diag::err_operator_overload_must_be_member) 5909 << FnDecl->getDeclName(); 5910 } 5911 5912 // C++ [over.inc]p1: 5913 // The user-defined function called operator++ implements the 5914 // prefix and postfix ++ operator. If this function is a member 5915 // function with no parameters, or a non-member function with one 5916 // parameter of class or enumeration type, it defines the prefix 5917 // increment operator ++ for objects of that type. If the function 5918 // is a member function with one parameter (which shall be of type 5919 // int) or a non-member function with two parameters (the second 5920 // of which shall be of type int), it defines the postfix 5921 // increment operator ++ for objects of that type. 5922 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5923 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5924 bool ParamIsInt = false; 5925 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5926 ParamIsInt = BT->getKind() == BuiltinType::Int; 5927 5928 if (!ParamIsInt) 5929 return Diag(LastParam->getLocation(), 5930 diag::err_operator_overload_post_incdec_must_be_int) 5931 << LastParam->getType() << (Op == OO_MinusMinus); 5932 } 5933 5934 return false; 5935} 5936 5937/// CheckLiteralOperatorDeclaration - Check whether the declaration 5938/// of this literal operator function is well-formed. If so, returns 5939/// false; otherwise, emits appropriate diagnostics and returns true. 5940bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5941 DeclContext *DC = FnDecl->getDeclContext(); 5942 Decl::Kind Kind = DC->getDeclKind(); 5943 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5944 Kind != Decl::LinkageSpec) { 5945 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5946 << FnDecl->getDeclName(); 5947 return true; 5948 } 5949 5950 bool Valid = false; 5951 5952 // template <char...> type operator "" name() is the only valid template 5953 // signature, and the only valid signature with no parameters. 5954 if (FnDecl->param_size() == 0) { 5955 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5956 // Must have only one template parameter 5957 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5958 if (Params->size() == 1) { 5959 NonTypeTemplateParmDecl *PmDecl = 5960 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5961 5962 // The template parameter must be a char parameter pack. 5963 // FIXME: This test will always fail because non-type parameter packs 5964 // have not been implemented. 5965 if (PmDecl && PmDecl->isTemplateParameterPack() && 5966 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5967 Valid = true; 5968 } 5969 } 5970 } else { 5971 // Check the first parameter 5972 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5973 5974 QualType T = (*Param)->getType(); 5975 5976 // unsigned long long int, long double, and any character type are allowed 5977 // as the only parameters. 5978 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5979 Context.hasSameType(T, Context.LongDoubleTy) || 5980 Context.hasSameType(T, Context.CharTy) || 5981 Context.hasSameType(T, Context.WCharTy) || 5982 Context.hasSameType(T, Context.Char16Ty) || 5983 Context.hasSameType(T, Context.Char32Ty)) { 5984 if (++Param == FnDecl->param_end()) 5985 Valid = true; 5986 goto FinishedParams; 5987 } 5988 5989 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5990 const PointerType *PT = T->getAs<PointerType>(); 5991 if (!PT) 5992 goto FinishedParams; 5993 T = PT->getPointeeType(); 5994 if (!T.isConstQualified()) 5995 goto FinishedParams; 5996 T = T.getUnqualifiedType(); 5997 5998 // Move on to the second parameter; 5999 ++Param; 6000 6001 // If there is no second parameter, the first must be a const char * 6002 if (Param == FnDecl->param_end()) { 6003 if (Context.hasSameType(T, Context.CharTy)) 6004 Valid = true; 6005 goto FinishedParams; 6006 } 6007 6008 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6009 // are allowed as the first parameter to a two-parameter function 6010 if (!(Context.hasSameType(T, Context.CharTy) || 6011 Context.hasSameType(T, Context.WCharTy) || 6012 Context.hasSameType(T, Context.Char16Ty) || 6013 Context.hasSameType(T, Context.Char32Ty))) 6014 goto FinishedParams; 6015 6016 // The second and final parameter must be an std::size_t 6017 T = (*Param)->getType().getUnqualifiedType(); 6018 if (Context.hasSameType(T, Context.getSizeType()) && 6019 ++Param == FnDecl->param_end()) 6020 Valid = true; 6021 } 6022 6023 // FIXME: This diagnostic is absolutely terrible. 6024FinishedParams: 6025 if (!Valid) { 6026 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6027 << FnDecl->getDeclName(); 6028 return true; 6029 } 6030 6031 return false; 6032} 6033 6034/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6035/// linkage specification, including the language and (if present) 6036/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6037/// the location of the language string literal, which is provided 6038/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6039/// the '{' brace. Otherwise, this linkage specification does not 6040/// have any braces. 6041Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6042 SourceLocation ExternLoc, 6043 SourceLocation LangLoc, 6044 llvm::StringRef Lang, 6045 SourceLocation LBraceLoc) { 6046 LinkageSpecDecl::LanguageIDs Language; 6047 if (Lang == "\"C\"") 6048 Language = LinkageSpecDecl::lang_c; 6049 else if (Lang == "\"C++\"") 6050 Language = LinkageSpecDecl::lang_cxx; 6051 else { 6052 Diag(LangLoc, diag::err_bad_language); 6053 return 0; 6054 } 6055 6056 // FIXME: Add all the various semantics of linkage specifications 6057 6058 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6059 LangLoc, Language, 6060 LBraceLoc.isValid()); 6061 CurContext->addDecl(D); 6062 PushDeclContext(S, D); 6063 return D; 6064} 6065 6066/// ActOnFinishLinkageSpecification - Complete the definition of 6067/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6068/// valid, it's the position of the closing '}' brace in a linkage 6069/// specification that uses braces. 6070Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6071 Decl *LinkageSpec, 6072 SourceLocation RBraceLoc) { 6073 if (LinkageSpec) 6074 PopDeclContext(); 6075 return LinkageSpec; 6076} 6077 6078/// \brief Perform semantic analysis for the variable declaration that 6079/// occurs within a C++ catch clause, returning the newly-created 6080/// variable. 6081VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6082 TypeSourceInfo *TInfo, 6083 IdentifierInfo *Name, 6084 SourceLocation Loc) { 6085 bool Invalid = false; 6086 QualType ExDeclType = TInfo->getType(); 6087 6088 // Arrays and functions decay. 6089 if (ExDeclType->isArrayType()) 6090 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6091 else if (ExDeclType->isFunctionType()) 6092 ExDeclType = Context.getPointerType(ExDeclType); 6093 6094 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6095 // The exception-declaration shall not denote a pointer or reference to an 6096 // incomplete type, other than [cv] void*. 6097 // N2844 forbids rvalue references. 6098 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6099 Diag(Loc, diag::err_catch_rvalue_ref); 6100 Invalid = true; 6101 } 6102 6103 // GCC allows catching pointers and references to incomplete types 6104 // as an extension; so do we, but we warn by default. 6105 6106 QualType BaseType = ExDeclType; 6107 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6108 unsigned DK = diag::err_catch_incomplete; 6109 bool IncompleteCatchIsInvalid = true; 6110 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6111 BaseType = Ptr->getPointeeType(); 6112 Mode = 1; 6113 DK = diag::ext_catch_incomplete_ptr; 6114 IncompleteCatchIsInvalid = false; 6115 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6116 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6117 BaseType = Ref->getPointeeType(); 6118 Mode = 2; 6119 DK = diag::ext_catch_incomplete_ref; 6120 IncompleteCatchIsInvalid = false; 6121 } 6122 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6123 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6124 IncompleteCatchIsInvalid) 6125 Invalid = true; 6126 6127 if (!Invalid && !ExDeclType->isDependentType() && 6128 RequireNonAbstractType(Loc, ExDeclType, 6129 diag::err_abstract_type_in_decl, 6130 AbstractVariableType)) 6131 Invalid = true; 6132 6133 // Only the non-fragile NeXT runtime currently supports C++ catches 6134 // of ObjC types, and no runtime supports catching ObjC types by value. 6135 if (!Invalid && getLangOptions().ObjC1) { 6136 QualType T = ExDeclType; 6137 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6138 T = RT->getPointeeType(); 6139 6140 if (T->isObjCObjectType()) { 6141 Diag(Loc, diag::err_objc_object_catch); 6142 Invalid = true; 6143 } else if (T->isObjCObjectPointerType()) { 6144 if (!getLangOptions().NeXTRuntime) { 6145 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6146 Invalid = true; 6147 } else if (!getLangOptions().ObjCNonFragileABI) { 6148 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6149 Invalid = true; 6150 } 6151 } 6152 } 6153 6154 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6155 Name, ExDeclType, TInfo, SC_None, 6156 SC_None); 6157 ExDecl->setExceptionVariable(true); 6158 6159 if (!Invalid) { 6160 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6161 // C++ [except.handle]p16: 6162 // The object declared in an exception-declaration or, if the 6163 // exception-declaration does not specify a name, a temporary (12.2) is 6164 // copy-initialized (8.5) from the exception object. [...] 6165 // The object is destroyed when the handler exits, after the destruction 6166 // of any automatic objects initialized within the handler. 6167 // 6168 // We just pretend to initialize the object with itself, then make sure 6169 // it can be destroyed later. 6170 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6171 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6172 Loc, ExDeclType, 0); 6173 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6174 SourceLocation()); 6175 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6176 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6177 MultiExprArg(*this, &ExDeclRef, 1)); 6178 if (Result.isInvalid()) 6179 Invalid = true; 6180 else 6181 FinalizeVarWithDestructor(ExDecl, RecordTy); 6182 } 6183 } 6184 6185 if (Invalid) 6186 ExDecl->setInvalidDecl(); 6187 6188 return ExDecl; 6189} 6190 6191/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6192/// handler. 6193Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6194 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6195 QualType ExDeclType = TInfo->getType(); 6196 6197 bool Invalid = D.isInvalidType(); 6198 IdentifierInfo *II = D.getIdentifier(); 6199 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6200 LookupOrdinaryName, 6201 ForRedeclaration)) { 6202 // The scope should be freshly made just for us. There is just no way 6203 // it contains any previous declaration. 6204 assert(!S->isDeclScope(PrevDecl)); 6205 if (PrevDecl->isTemplateParameter()) { 6206 // Maybe we will complain about the shadowed template parameter. 6207 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6208 } 6209 } 6210 6211 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6212 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6213 << D.getCXXScopeSpec().getRange(); 6214 Invalid = true; 6215 } 6216 6217 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6218 D.getIdentifier(), 6219 D.getIdentifierLoc()); 6220 6221 if (Invalid) 6222 ExDecl->setInvalidDecl(); 6223 6224 // Add the exception declaration into this scope. 6225 if (II) 6226 PushOnScopeChains(ExDecl, S); 6227 else 6228 CurContext->addDecl(ExDecl); 6229 6230 ProcessDeclAttributes(S, ExDecl, D); 6231 return ExDecl; 6232} 6233 6234Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6235 Expr *AssertExpr, 6236 Expr *AssertMessageExpr_) { 6237 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6238 6239 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6240 llvm::APSInt Value(32); 6241 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6242 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6243 AssertExpr->getSourceRange(); 6244 return 0; 6245 } 6246 6247 if (Value == 0) { 6248 Diag(AssertLoc, diag::err_static_assert_failed) 6249 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6250 } 6251 } 6252 6253 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6254 AssertExpr, AssertMessage); 6255 6256 CurContext->addDecl(Decl); 6257 return Decl; 6258} 6259 6260/// \brief Perform semantic analysis of the given friend type declaration. 6261/// 6262/// \returns A friend declaration that. 6263FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6264 TypeSourceInfo *TSInfo) { 6265 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6266 6267 QualType T = TSInfo->getType(); 6268 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6269 6270 if (!getLangOptions().CPlusPlus0x) { 6271 // C++03 [class.friend]p2: 6272 // An elaborated-type-specifier shall be used in a friend declaration 6273 // for a class.* 6274 // 6275 // * The class-key of the elaborated-type-specifier is required. 6276 if (!ActiveTemplateInstantiations.empty()) { 6277 // Do not complain about the form of friend template types during 6278 // template instantiation; we will already have complained when the 6279 // template was declared. 6280 } else if (!T->isElaboratedTypeSpecifier()) { 6281 // If we evaluated the type to a record type, suggest putting 6282 // a tag in front. 6283 if (const RecordType *RT = T->getAs<RecordType>()) { 6284 RecordDecl *RD = RT->getDecl(); 6285 6286 std::string InsertionText = std::string(" ") + RD->getKindName(); 6287 6288 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6289 << (unsigned) RD->getTagKind() 6290 << T 6291 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6292 InsertionText); 6293 } else { 6294 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6295 << T 6296 << SourceRange(FriendLoc, TypeRange.getEnd()); 6297 } 6298 } else if (T->getAs<EnumType>()) { 6299 Diag(FriendLoc, diag::ext_enum_friend) 6300 << T 6301 << SourceRange(FriendLoc, TypeRange.getEnd()); 6302 } 6303 } 6304 6305 // C++0x [class.friend]p3: 6306 // If the type specifier in a friend declaration designates a (possibly 6307 // cv-qualified) class type, that class is declared as a friend; otherwise, 6308 // the friend declaration is ignored. 6309 6310 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6311 // in [class.friend]p3 that we do not implement. 6312 6313 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6314} 6315 6316/// Handle a friend type declaration. This works in tandem with 6317/// ActOnTag. 6318/// 6319/// Notes on friend class templates: 6320/// 6321/// We generally treat friend class declarations as if they were 6322/// declaring a class. So, for example, the elaborated type specifier 6323/// in a friend declaration is required to obey the restrictions of a 6324/// class-head (i.e. no typedefs in the scope chain), template 6325/// parameters are required to match up with simple template-ids, &c. 6326/// However, unlike when declaring a template specialization, it's 6327/// okay to refer to a template specialization without an empty 6328/// template parameter declaration, e.g. 6329/// friend class A<T>::B<unsigned>; 6330/// We permit this as a special case; if there are any template 6331/// parameters present at all, require proper matching, i.e. 6332/// template <> template <class T> friend class A<int>::B; 6333Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6334 MultiTemplateParamsArg TempParams) { 6335 SourceLocation Loc = DS.getSourceRange().getBegin(); 6336 6337 assert(DS.isFriendSpecified()); 6338 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6339 6340 // Try to convert the decl specifier to a type. This works for 6341 // friend templates because ActOnTag never produces a ClassTemplateDecl 6342 // for a TUK_Friend. 6343 Declarator TheDeclarator(DS, Declarator::MemberContext); 6344 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6345 QualType T = TSI->getType(); 6346 if (TheDeclarator.isInvalidType()) 6347 return 0; 6348 6349 // This is definitely an error in C++98. It's probably meant to 6350 // be forbidden in C++0x, too, but the specification is just 6351 // poorly written. 6352 // 6353 // The problem is with declarations like the following: 6354 // template <T> friend A<T>::foo; 6355 // where deciding whether a class C is a friend or not now hinges 6356 // on whether there exists an instantiation of A that causes 6357 // 'foo' to equal C. There are restrictions on class-heads 6358 // (which we declare (by fiat) elaborated friend declarations to 6359 // be) that makes this tractable. 6360 // 6361 // FIXME: handle "template <> friend class A<T>;", which 6362 // is possibly well-formed? Who even knows? 6363 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6364 Diag(Loc, diag::err_tagless_friend_type_template) 6365 << DS.getSourceRange(); 6366 return 0; 6367 } 6368 6369 // C++98 [class.friend]p1: A friend of a class is a function 6370 // or class that is not a member of the class . . . 6371 // This is fixed in DR77, which just barely didn't make the C++03 6372 // deadline. It's also a very silly restriction that seriously 6373 // affects inner classes and which nobody else seems to implement; 6374 // thus we never diagnose it, not even in -pedantic. 6375 // 6376 // But note that we could warn about it: it's always useless to 6377 // friend one of your own members (it's not, however, worthless to 6378 // friend a member of an arbitrary specialization of your template). 6379 6380 Decl *D; 6381 if (unsigned NumTempParamLists = TempParams.size()) 6382 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6383 NumTempParamLists, 6384 (TemplateParameterList**) TempParams.release(), 6385 TSI, 6386 DS.getFriendSpecLoc()); 6387 else 6388 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6389 6390 if (!D) 6391 return 0; 6392 6393 D->setAccess(AS_public); 6394 CurContext->addDecl(D); 6395 6396 return D; 6397} 6398 6399Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6400 Declarator &D, 6401 bool IsDefinition, 6402 MultiTemplateParamsArg TemplateParams) { 6403 const DeclSpec &DS = D.getDeclSpec(); 6404 6405 assert(DS.isFriendSpecified()); 6406 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6407 6408 SourceLocation Loc = D.getIdentifierLoc(); 6409 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6410 QualType T = TInfo->getType(); 6411 6412 // C++ [class.friend]p1 6413 // A friend of a class is a function or class.... 6414 // Note that this sees through typedefs, which is intended. 6415 // It *doesn't* see through dependent types, which is correct 6416 // according to [temp.arg.type]p3: 6417 // If a declaration acquires a function type through a 6418 // type dependent on a template-parameter and this causes 6419 // a declaration that does not use the syntactic form of a 6420 // function declarator to have a function type, the program 6421 // is ill-formed. 6422 if (!T->isFunctionType()) { 6423 Diag(Loc, diag::err_unexpected_friend); 6424 6425 // It might be worthwhile to try to recover by creating an 6426 // appropriate declaration. 6427 return 0; 6428 } 6429 6430 // C++ [namespace.memdef]p3 6431 // - If a friend declaration in a non-local class first declares a 6432 // class or function, the friend class or function is a member 6433 // of the innermost enclosing namespace. 6434 // - The name of the friend is not found by simple name lookup 6435 // until a matching declaration is provided in that namespace 6436 // scope (either before or after the class declaration granting 6437 // friendship). 6438 // - If a friend function is called, its name may be found by the 6439 // name lookup that considers functions from namespaces and 6440 // classes associated with the types of the function arguments. 6441 // - When looking for a prior declaration of a class or a function 6442 // declared as a friend, scopes outside the innermost enclosing 6443 // namespace scope are not considered. 6444 6445 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6446 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6447 DeclarationName Name = NameInfo.getName(); 6448 assert(Name); 6449 6450 // The context we found the declaration in, or in which we should 6451 // create the declaration. 6452 DeclContext *DC; 6453 6454 // FIXME: handle local classes 6455 6456 // Recover from invalid scope qualifiers as if they just weren't there. 6457 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6458 ForRedeclaration); 6459 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6460 DC = computeDeclContext(ScopeQual); 6461 6462 // FIXME: handle dependent contexts 6463 if (!DC) return 0; 6464 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6465 6466 LookupQualifiedName(Previous, DC); 6467 6468 // Ignore things found implicitly in the wrong scope. 6469 // TODO: better diagnostics for this case. Suggesting the right 6470 // qualified scope would be nice... 6471 LookupResult::Filter F = Previous.makeFilter(); 6472 while (F.hasNext()) { 6473 NamedDecl *D = F.next(); 6474 if (!DC->InEnclosingNamespaceSetOf( 6475 D->getDeclContext()->getRedeclContext())) 6476 F.erase(); 6477 } 6478 F.done(); 6479 6480 if (Previous.empty()) { 6481 D.setInvalidType(); 6482 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6483 return 0; 6484 } 6485 6486 // C++ [class.friend]p1: A friend of a class is a function or 6487 // class that is not a member of the class . . . 6488 if (DC->Equals(CurContext)) 6489 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6490 6491 // Otherwise walk out to the nearest namespace scope looking for matches. 6492 } else { 6493 // TODO: handle local class contexts. 6494 6495 DC = CurContext; 6496 while (true) { 6497 // Skip class contexts. If someone can cite chapter and verse 6498 // for this behavior, that would be nice --- it's what GCC and 6499 // EDG do, and it seems like a reasonable intent, but the spec 6500 // really only says that checks for unqualified existing 6501 // declarations should stop at the nearest enclosing namespace, 6502 // not that they should only consider the nearest enclosing 6503 // namespace. 6504 while (DC->isRecord()) 6505 DC = DC->getParent(); 6506 6507 LookupQualifiedName(Previous, DC); 6508 6509 // TODO: decide what we think about using declarations. 6510 if (!Previous.empty()) 6511 break; 6512 6513 if (DC->isFileContext()) break; 6514 DC = DC->getParent(); 6515 } 6516 6517 // C++ [class.friend]p1: A friend of a class is a function or 6518 // class that is not a member of the class . . . 6519 // C++0x changes this for both friend types and functions. 6520 // Most C++ 98 compilers do seem to give an error here, so 6521 // we do, too. 6522 if (!Previous.empty() && DC->Equals(CurContext) 6523 && !getLangOptions().CPlusPlus0x) 6524 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6525 } 6526 6527 if (DC->isFileContext()) { 6528 // This implies that it has to be an operator or function. 6529 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6530 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6531 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6532 Diag(Loc, diag::err_introducing_special_friend) << 6533 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6534 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6535 return 0; 6536 } 6537 } 6538 6539 bool Redeclaration = false; 6540 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6541 move(TemplateParams), 6542 IsDefinition, 6543 Redeclaration); 6544 if (!ND) return 0; 6545 6546 assert(ND->getDeclContext() == DC); 6547 assert(ND->getLexicalDeclContext() == CurContext); 6548 6549 // Add the function declaration to the appropriate lookup tables, 6550 // adjusting the redeclarations list as necessary. We don't 6551 // want to do this yet if the friending class is dependent. 6552 // 6553 // Also update the scope-based lookup if the target context's 6554 // lookup context is in lexical scope. 6555 if (!CurContext->isDependentContext()) { 6556 DC = DC->getRedeclContext(); 6557 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6558 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6559 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6560 } 6561 6562 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6563 D.getIdentifierLoc(), ND, 6564 DS.getFriendSpecLoc()); 6565 FrD->setAccess(AS_public); 6566 CurContext->addDecl(FrD); 6567 6568 return ND; 6569} 6570 6571void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6572 AdjustDeclIfTemplate(Dcl); 6573 6574 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6575 if (!Fn) { 6576 Diag(DelLoc, diag::err_deleted_non_function); 6577 return; 6578 } 6579 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6580 Diag(DelLoc, diag::err_deleted_decl_not_first); 6581 Diag(Prev->getLocation(), diag::note_previous_declaration); 6582 // If the declaration wasn't the first, we delete the function anyway for 6583 // recovery. 6584 } 6585 Fn->setDeleted(); 6586} 6587 6588static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6589 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6590 ++CI) { 6591 Stmt *SubStmt = *CI; 6592 if (!SubStmt) 6593 continue; 6594 if (isa<ReturnStmt>(SubStmt)) 6595 Self.Diag(SubStmt->getSourceRange().getBegin(), 6596 diag::err_return_in_constructor_handler); 6597 if (!isa<Expr>(SubStmt)) 6598 SearchForReturnInStmt(Self, SubStmt); 6599 } 6600} 6601 6602void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6603 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6604 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6605 SearchForReturnInStmt(*this, Handler); 6606 } 6607} 6608 6609bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6610 const CXXMethodDecl *Old) { 6611 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6612 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6613 6614 if (Context.hasSameType(NewTy, OldTy) || 6615 NewTy->isDependentType() || OldTy->isDependentType()) 6616 return false; 6617 6618 // Check if the return types are covariant 6619 QualType NewClassTy, OldClassTy; 6620 6621 /// Both types must be pointers or references to classes. 6622 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6623 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6624 NewClassTy = NewPT->getPointeeType(); 6625 OldClassTy = OldPT->getPointeeType(); 6626 } 6627 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6628 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6629 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6630 NewClassTy = NewRT->getPointeeType(); 6631 OldClassTy = OldRT->getPointeeType(); 6632 } 6633 } 6634 } 6635 6636 // The return types aren't either both pointers or references to a class type. 6637 if (NewClassTy.isNull()) { 6638 Diag(New->getLocation(), 6639 diag::err_different_return_type_for_overriding_virtual_function) 6640 << New->getDeclName() << NewTy << OldTy; 6641 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6642 6643 return true; 6644 } 6645 6646 // C++ [class.virtual]p6: 6647 // If the return type of D::f differs from the return type of B::f, the 6648 // class type in the return type of D::f shall be complete at the point of 6649 // declaration of D::f or shall be the class type D. 6650 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6651 if (!RT->isBeingDefined() && 6652 RequireCompleteType(New->getLocation(), NewClassTy, 6653 PDiag(diag::err_covariant_return_incomplete) 6654 << New->getDeclName())) 6655 return true; 6656 } 6657 6658 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6659 // Check if the new class derives from the old class. 6660 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6661 Diag(New->getLocation(), 6662 diag::err_covariant_return_not_derived) 6663 << New->getDeclName() << NewTy << OldTy; 6664 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6665 return true; 6666 } 6667 6668 // Check if we the conversion from derived to base is valid. 6669 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6670 diag::err_covariant_return_inaccessible_base, 6671 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6672 // FIXME: Should this point to the return type? 6673 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6674 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6675 return true; 6676 } 6677 } 6678 6679 // The qualifiers of the return types must be the same. 6680 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6681 Diag(New->getLocation(), 6682 diag::err_covariant_return_type_different_qualifications) 6683 << New->getDeclName() << NewTy << OldTy; 6684 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6685 return true; 6686 }; 6687 6688 6689 // The new class type must have the same or less qualifiers as the old type. 6690 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6691 Diag(New->getLocation(), 6692 diag::err_covariant_return_type_class_type_more_qualified) 6693 << New->getDeclName() << NewTy << OldTy; 6694 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6695 return true; 6696 }; 6697 6698 return false; 6699} 6700 6701bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6702 const CXXMethodDecl *Old) 6703{ 6704 if (Old->hasAttr<FinalAttr>()) { 6705 Diag(New->getLocation(), diag::err_final_function_overridden) 6706 << New->getDeclName(); 6707 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6708 return true; 6709 } 6710 6711 return false; 6712} 6713 6714/// \brief Mark the given method pure. 6715/// 6716/// \param Method the method to be marked pure. 6717/// 6718/// \param InitRange the source range that covers the "0" initializer. 6719bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6720 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6721 Method->setPure(); 6722 6723 // A class is abstract if at least one function is pure virtual. 6724 Method->getParent()->setAbstract(true); 6725 return false; 6726 } 6727 6728 if (!Method->isInvalidDecl()) 6729 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6730 << Method->getDeclName() << InitRange; 6731 return true; 6732} 6733 6734/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6735/// an initializer for the out-of-line declaration 'Dcl'. The scope 6736/// is a fresh scope pushed for just this purpose. 6737/// 6738/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6739/// static data member of class X, names should be looked up in the scope of 6740/// class X. 6741void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6742 // If there is no declaration, there was an error parsing it. 6743 if (D == 0) return; 6744 6745 // We should only get called for declarations with scope specifiers, like: 6746 // int foo::bar; 6747 assert(D->isOutOfLine()); 6748 EnterDeclaratorContext(S, D->getDeclContext()); 6749} 6750 6751/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6752/// initializer for the out-of-line declaration 'D'. 6753void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6754 // If there is no declaration, there was an error parsing it. 6755 if (D == 0) return; 6756 6757 assert(D->isOutOfLine()); 6758 ExitDeclaratorContext(S); 6759} 6760 6761/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6762/// C++ if/switch/while/for statement. 6763/// e.g: "if (int x = f()) {...}" 6764DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6765 // C++ 6.4p2: 6766 // The declarator shall not specify a function or an array. 6767 // The type-specifier-seq shall not contain typedef and shall not declare a 6768 // new class or enumeration. 6769 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6770 "Parser allowed 'typedef' as storage class of condition decl."); 6771 6772 TagDecl *OwnedTag = 0; 6773 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6774 QualType Ty = TInfo->getType(); 6775 6776 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6777 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6778 // would be created and CXXConditionDeclExpr wants a VarDecl. 6779 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6780 << D.getSourceRange(); 6781 return DeclResult(); 6782 } else if (OwnedTag && OwnedTag->isDefinition()) { 6783 // The type-specifier-seq shall not declare a new class or enumeration. 6784 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6785 } 6786 6787 Decl *Dcl = ActOnDeclarator(S, D); 6788 if (!Dcl) 6789 return DeclResult(); 6790 6791 return Dcl; 6792} 6793 6794void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6795 bool DefinitionRequired) { 6796 // Ignore any vtable uses in unevaluated operands or for classes that do 6797 // not have a vtable. 6798 if (!Class->isDynamicClass() || Class->isDependentContext() || 6799 CurContext->isDependentContext() || 6800 ExprEvalContexts.back().Context == Unevaluated) 6801 return; 6802 6803 // Try to insert this class into the map. 6804 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6805 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6806 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6807 if (!Pos.second) { 6808 // If we already had an entry, check to see if we are promoting this vtable 6809 // to required a definition. If so, we need to reappend to the VTableUses 6810 // list, since we may have already processed the first entry. 6811 if (DefinitionRequired && !Pos.first->second) { 6812 Pos.first->second = true; 6813 } else { 6814 // Otherwise, we can early exit. 6815 return; 6816 } 6817 } 6818 6819 // Local classes need to have their virtual members marked 6820 // immediately. For all other classes, we mark their virtual members 6821 // at the end of the translation unit. 6822 if (Class->isLocalClass()) 6823 MarkVirtualMembersReferenced(Loc, Class); 6824 else 6825 VTableUses.push_back(std::make_pair(Class, Loc)); 6826} 6827 6828bool Sema::DefineUsedVTables() { 6829 // If any dynamic classes have their key function defined within 6830 // this translation unit, then those vtables are considered "used" and must 6831 // be emitted. 6832 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6833 if (const CXXMethodDecl *KeyFunction 6834 = Context.getKeyFunction(DynamicClasses[I])) { 6835 const FunctionDecl *Definition = 0; 6836 if (KeyFunction->hasBody(Definition)) 6837 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6838 } 6839 } 6840 6841 if (VTableUses.empty()) 6842 return false; 6843 6844 // Note: The VTableUses vector could grow as a result of marking 6845 // the members of a class as "used", so we check the size each 6846 // time through the loop and prefer indices (with are stable) to 6847 // iterators (which are not). 6848 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6849 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6850 if (!Class) 6851 continue; 6852 6853 SourceLocation Loc = VTableUses[I].second; 6854 6855 // If this class has a key function, but that key function is 6856 // defined in another translation unit, we don't need to emit the 6857 // vtable even though we're using it. 6858 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6859 if (KeyFunction && !KeyFunction->hasBody()) { 6860 switch (KeyFunction->getTemplateSpecializationKind()) { 6861 case TSK_Undeclared: 6862 case TSK_ExplicitSpecialization: 6863 case TSK_ExplicitInstantiationDeclaration: 6864 // The key function is in another translation unit. 6865 continue; 6866 6867 case TSK_ExplicitInstantiationDefinition: 6868 case TSK_ImplicitInstantiation: 6869 // We will be instantiating the key function. 6870 break; 6871 } 6872 } else if (!KeyFunction) { 6873 // If we have a class with no key function that is the subject 6874 // of an explicit instantiation declaration, suppress the 6875 // vtable; it will live with the explicit instantiation 6876 // definition. 6877 bool IsExplicitInstantiationDeclaration 6878 = Class->getTemplateSpecializationKind() 6879 == TSK_ExplicitInstantiationDeclaration; 6880 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6881 REnd = Class->redecls_end(); 6882 R != REnd; ++R) { 6883 TemplateSpecializationKind TSK 6884 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6885 if (TSK == TSK_ExplicitInstantiationDeclaration) 6886 IsExplicitInstantiationDeclaration = true; 6887 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6888 IsExplicitInstantiationDeclaration = false; 6889 break; 6890 } 6891 } 6892 6893 if (IsExplicitInstantiationDeclaration) 6894 continue; 6895 } 6896 6897 // Mark all of the virtual members of this class as referenced, so 6898 // that we can build a vtable. Then, tell the AST consumer that a 6899 // vtable for this class is required. 6900 MarkVirtualMembersReferenced(Loc, Class); 6901 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6902 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6903 6904 // Optionally warn if we're emitting a weak vtable. 6905 if (Class->getLinkage() == ExternalLinkage && 6906 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6907 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6908 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6909 } 6910 } 6911 VTableUses.clear(); 6912 6913 return true; 6914} 6915 6916void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6917 const CXXRecordDecl *RD) { 6918 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6919 e = RD->method_end(); i != e; ++i) { 6920 CXXMethodDecl *MD = *i; 6921 6922 // C++ [basic.def.odr]p2: 6923 // [...] A virtual member function is used if it is not pure. [...] 6924 if (MD->isVirtual() && !MD->isPure()) 6925 MarkDeclarationReferenced(Loc, MD); 6926 } 6927 6928 // Only classes that have virtual bases need a VTT. 6929 if (RD->getNumVBases() == 0) 6930 return; 6931 6932 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6933 e = RD->bases_end(); i != e; ++i) { 6934 const CXXRecordDecl *Base = 6935 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6936 if (Base->getNumVBases() == 0) 6937 continue; 6938 MarkVirtualMembersReferenced(Loc, Base); 6939 } 6940} 6941 6942/// SetIvarInitializers - This routine builds initialization ASTs for the 6943/// Objective-C implementation whose ivars need be initialized. 6944void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6945 if (!getLangOptions().CPlusPlus) 6946 return; 6947 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6948 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6949 CollectIvarsToConstructOrDestruct(OID, ivars); 6950 if (ivars.empty()) 6951 return; 6952 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6953 for (unsigned i = 0; i < ivars.size(); i++) { 6954 FieldDecl *Field = ivars[i]; 6955 if (Field->isInvalidDecl()) 6956 continue; 6957 6958 CXXBaseOrMemberInitializer *Member; 6959 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6960 InitializationKind InitKind = 6961 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6962 6963 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6964 ExprResult MemberInit = 6965 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 6966 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6967 // Note, MemberInit could actually come back empty if no initialization 6968 // is required (e.g., because it would call a trivial default constructor) 6969 if (!MemberInit.get() || MemberInit.isInvalid()) 6970 continue; 6971 6972 Member = 6973 new (Context) CXXBaseOrMemberInitializer(Context, 6974 Field, SourceLocation(), 6975 SourceLocation(), 6976 MemberInit.takeAs<Expr>(), 6977 SourceLocation()); 6978 AllToInit.push_back(Member); 6979 6980 // Be sure that the destructor is accessible and is marked as referenced. 6981 if (const RecordType *RecordTy 6982 = Context.getBaseElementType(Field->getType()) 6983 ->getAs<RecordType>()) { 6984 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6985 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6986 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6987 CheckDestructorAccess(Field->getLocation(), Destructor, 6988 PDiag(diag::err_access_dtor_ivar) 6989 << Context.getBaseElementType(Field->getType())); 6990 } 6991 } 6992 } 6993 ObjCImplementation->setIvarInitializers(Context, 6994 AllToInit.data(), AllToInit.size()); 6995 } 6996} 6997