SemaDeclCXX.cpp revision 9fe183ae1ec568716501f861235afecebee8cd45
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 // A class with a non-empty base class is not empty. 520 // FIXME: Standard ref? 521 if (!BaseClass->isEmpty()) 522 Class->setEmpty(false); 523 524 // C++ [class.virtual]p1: 525 // A class that [...] inherits a virtual function is called a polymorphic 526 // class. 527 if (BaseClass->isPolymorphic()) 528 Class->setPolymorphic(true); 529 530 if (BaseIsVirtual) { 531 // C++ [class.ctor]p5: 532 // A constructor is trivial if its class has no virtual base classes. 533 Class->setHasTrivialConstructor(false); 534 535 // C++ [class.copy]p6: 536 // A copy constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialCopyConstructor(false); 538 539 // C++ [class.copy]p11: 540 // A copy assignment operator is trivial if its class has no virtual 541 // base classes. 542 Class->setHasTrivialCopyAssignment(false); 543 544 // C++0x [meta.unary.prop] is_empty: 545 // T is a class type, but not a union type, with ... no virtual base 546 // classes 547 Class->setEmpty(false); 548 } else { 549 // C++ [class.ctor]p5: 550 // A constructor is trivial if all the direct base classes of its 551 // class have trivial constructors. 552 if (!BaseClass->hasTrivialConstructor()) 553 Class->setHasTrivialConstructor(false); 554 555 // C++ [class.copy]p6: 556 // A copy constructor is trivial if all the direct base classes of its 557 // class have trivial copy constructors. 558 if (!BaseClass->hasTrivialCopyConstructor()) 559 Class->setHasTrivialCopyConstructor(false); 560 561 // C++ [class.copy]p11: 562 // A copy assignment operator is trivial if all the direct base classes 563 // of its class have trivial copy assignment operators. 564 if (!BaseClass->hasTrivialCopyAssignment()) 565 Class->setHasTrivialCopyAssignment(false); 566 } 567 568 // C++ [class.ctor]p3: 569 // A destructor is trivial if all the direct base classes of its class 570 // have trivial destructors. 571 if (!BaseClass->hasTrivialDestructor()) 572 Class->setHasTrivialDestructor(false); 573} 574 575/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 576/// one entry in the base class list of a class specifier, for 577/// example: 578/// class foo : public bar, virtual private baz { 579/// 'public bar' and 'virtual private baz' are each base-specifiers. 580BaseResult 581Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 582 bool Virtual, AccessSpecifier Access, 583 ParsedType basetype, SourceLocation BaseLoc) { 584 if (!classdecl) 585 return true; 586 587 AdjustDeclIfTemplate(classdecl); 588 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 589 if (!Class) 590 return true; 591 592 TypeSourceInfo *TInfo = 0; 593 GetTypeFromParser(basetype, &TInfo); 594 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 595 Virtual, Access, TInfo)) 596 return BaseSpec; 597 598 return true; 599} 600 601/// \brief Performs the actual work of attaching the given base class 602/// specifiers to a C++ class. 603bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 604 unsigned NumBases) { 605 if (NumBases == 0) 606 return false; 607 608 // Used to keep track of which base types we have already seen, so 609 // that we can properly diagnose redundant direct base types. Note 610 // that the key is always the unqualified canonical type of the base 611 // class. 612 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 613 614 // Copy non-redundant base specifiers into permanent storage. 615 unsigned NumGoodBases = 0; 616 bool Invalid = false; 617 for (unsigned idx = 0; idx < NumBases; ++idx) { 618 QualType NewBaseType 619 = Context.getCanonicalType(Bases[idx]->getType()); 620 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 621 if (!Class->hasObjectMember()) { 622 if (const RecordType *FDTTy = 623 NewBaseType.getTypePtr()->getAs<RecordType>()) 624 if (FDTTy->getDecl()->hasObjectMember()) 625 Class->setHasObjectMember(true); 626 } 627 628 if (KnownBaseTypes[NewBaseType]) { 629 // C++ [class.mi]p3: 630 // A class shall not be specified as a direct base class of a 631 // derived class more than once. 632 Diag(Bases[idx]->getSourceRange().getBegin(), 633 diag::err_duplicate_base_class) 634 << KnownBaseTypes[NewBaseType]->getType() 635 << Bases[idx]->getSourceRange(); 636 637 // Delete the duplicate base class specifier; we're going to 638 // overwrite its pointer later. 639 Context.Deallocate(Bases[idx]); 640 641 Invalid = true; 642 } else { 643 // Okay, add this new base class. 644 KnownBaseTypes[NewBaseType] = Bases[idx]; 645 Bases[NumGoodBases++] = Bases[idx]; 646 } 647 } 648 649 // Attach the remaining base class specifiers to the derived class. 650 Class->setBases(Bases, NumGoodBases); 651 652 // Delete the remaining (good) base class specifiers, since their 653 // data has been copied into the CXXRecordDecl. 654 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 655 Context.Deallocate(Bases[idx]); 656 657 return Invalid; 658} 659 660/// ActOnBaseSpecifiers - Attach the given base specifiers to the 661/// class, after checking whether there are any duplicate base 662/// classes. 663void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 664 unsigned NumBases) { 665 if (!ClassDecl || !Bases || !NumBases) 666 return; 667 668 AdjustDeclIfTemplate(ClassDecl); 669 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 670 (CXXBaseSpecifier**)(Bases), NumBases); 671} 672 673static CXXRecordDecl *GetClassForType(QualType T) { 674 if (const RecordType *RT = T->getAs<RecordType>()) 675 return cast<CXXRecordDecl>(RT->getDecl()); 676 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 677 return ICT->getDecl(); 678 else 679 return 0; 680} 681 682/// \brief Determine whether the type \p Derived is a C++ class that is 683/// derived from the type \p Base. 684bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 685 if (!getLangOptions().CPlusPlus) 686 return false; 687 688 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 689 if (!DerivedRD) 690 return false; 691 692 CXXRecordDecl *BaseRD = GetClassForType(Base); 693 if (!BaseRD) 694 return false; 695 696 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 697 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 698} 699 700/// \brief Determine whether the type \p Derived is a C++ class that is 701/// derived from the type \p Base. 702bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 703 if (!getLangOptions().CPlusPlus) 704 return false; 705 706 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 707 if (!DerivedRD) 708 return false; 709 710 CXXRecordDecl *BaseRD = GetClassForType(Base); 711 if (!BaseRD) 712 return false; 713 714 return DerivedRD->isDerivedFrom(BaseRD, Paths); 715} 716 717void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 718 CXXCastPath &BasePathArray) { 719 assert(BasePathArray.empty() && "Base path array must be empty!"); 720 assert(Paths.isRecordingPaths() && "Must record paths!"); 721 722 const CXXBasePath &Path = Paths.front(); 723 724 // We first go backward and check if we have a virtual base. 725 // FIXME: It would be better if CXXBasePath had the base specifier for 726 // the nearest virtual base. 727 unsigned Start = 0; 728 for (unsigned I = Path.size(); I != 0; --I) { 729 if (Path[I - 1].Base->isVirtual()) { 730 Start = I - 1; 731 break; 732 } 733 } 734 735 // Now add all bases. 736 for (unsigned I = Start, E = Path.size(); I != E; ++I) 737 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 738} 739 740/// \brief Determine whether the given base path includes a virtual 741/// base class. 742bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 743 for (CXXCastPath::const_iterator B = BasePath.begin(), 744 BEnd = BasePath.end(); 745 B != BEnd; ++B) 746 if ((*B)->isVirtual()) 747 return true; 748 749 return false; 750} 751 752/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 753/// conversion (where Derived and Base are class types) is 754/// well-formed, meaning that the conversion is unambiguous (and 755/// that all of the base classes are accessible). Returns true 756/// and emits a diagnostic if the code is ill-formed, returns false 757/// otherwise. Loc is the location where this routine should point to 758/// if there is an error, and Range is the source range to highlight 759/// if there is an error. 760bool 761Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 762 unsigned InaccessibleBaseID, 763 unsigned AmbigiousBaseConvID, 764 SourceLocation Loc, SourceRange Range, 765 DeclarationName Name, 766 CXXCastPath *BasePath) { 767 // First, determine whether the path from Derived to Base is 768 // ambiguous. This is slightly more expensive than checking whether 769 // the Derived to Base conversion exists, because here we need to 770 // explore multiple paths to determine if there is an ambiguity. 771 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 772 /*DetectVirtual=*/false); 773 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 774 assert(DerivationOkay && 775 "Can only be used with a derived-to-base conversion"); 776 (void)DerivationOkay; 777 778 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 779 if (InaccessibleBaseID) { 780 // Check that the base class can be accessed. 781 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 782 InaccessibleBaseID)) { 783 case AR_inaccessible: 784 return true; 785 case AR_accessible: 786 case AR_dependent: 787 case AR_delayed: 788 break; 789 } 790 } 791 792 // Build a base path if necessary. 793 if (BasePath) 794 BuildBasePathArray(Paths, *BasePath); 795 return false; 796 } 797 798 // We know that the derived-to-base conversion is ambiguous, and 799 // we're going to produce a diagnostic. Perform the derived-to-base 800 // search just one more time to compute all of the possible paths so 801 // that we can print them out. This is more expensive than any of 802 // the previous derived-to-base checks we've done, but at this point 803 // performance isn't as much of an issue. 804 Paths.clear(); 805 Paths.setRecordingPaths(true); 806 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 807 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 808 (void)StillOkay; 809 810 // Build up a textual representation of the ambiguous paths, e.g., 811 // D -> B -> A, that will be used to illustrate the ambiguous 812 // conversions in the diagnostic. We only print one of the paths 813 // to each base class subobject. 814 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 815 816 Diag(Loc, AmbigiousBaseConvID) 817 << Derived << Base << PathDisplayStr << Range << Name; 818 return true; 819} 820 821bool 822Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 823 SourceLocation Loc, SourceRange Range, 824 CXXCastPath *BasePath, 825 bool IgnoreAccess) { 826 return CheckDerivedToBaseConversion(Derived, Base, 827 IgnoreAccess ? 0 828 : diag::err_upcast_to_inaccessible_base, 829 diag::err_ambiguous_derived_to_base_conv, 830 Loc, Range, DeclarationName(), 831 BasePath); 832} 833 834 835/// @brief Builds a string representing ambiguous paths from a 836/// specific derived class to different subobjects of the same base 837/// class. 838/// 839/// This function builds a string that can be used in error messages 840/// to show the different paths that one can take through the 841/// inheritance hierarchy to go from the derived class to different 842/// subobjects of a base class. The result looks something like this: 843/// @code 844/// struct D -> struct B -> struct A 845/// struct D -> struct C -> struct A 846/// @endcode 847std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 848 std::string PathDisplayStr; 849 std::set<unsigned> DisplayedPaths; 850 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 851 Path != Paths.end(); ++Path) { 852 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 853 // We haven't displayed a path to this particular base 854 // class subobject yet. 855 PathDisplayStr += "\n "; 856 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 857 for (CXXBasePath::const_iterator Element = Path->begin(); 858 Element != Path->end(); ++Element) 859 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 860 } 861 } 862 863 return PathDisplayStr; 864} 865 866//===----------------------------------------------------------------------===// 867// C++ class member Handling 868//===----------------------------------------------------------------------===// 869 870/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 871Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 872 SourceLocation ASLoc, 873 SourceLocation ColonLoc) { 874 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 875 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 876 ASLoc, ColonLoc); 877 CurContext->addHiddenDecl(ASDecl); 878 return ASDecl; 879} 880 881/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 882/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 883/// bitfield width if there is one and 'InitExpr' specifies the initializer if 884/// any. 885Decl * 886Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 887 MultiTemplateParamsArg TemplateParameterLists, 888 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 889 bool Deleted) { 890 const DeclSpec &DS = D.getDeclSpec(); 891 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 892 DeclarationName Name = NameInfo.getName(); 893 SourceLocation Loc = NameInfo.getLoc(); 894 Expr *BitWidth = static_cast<Expr*>(BW); 895 Expr *Init = static_cast<Expr*>(InitExpr); 896 897 assert(isa<CXXRecordDecl>(CurContext)); 898 assert(!DS.isFriendSpecified()); 899 900 bool isFunc = false; 901 if (D.isFunctionDeclarator()) 902 isFunc = true; 903 else if (D.getNumTypeObjects() == 0 && 904 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 905 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 906 isFunc = TDType->isFunctionType(); 907 } 908 909 // C++ 9.2p6: A member shall not be declared to have automatic storage 910 // duration (auto, register) or with the extern storage-class-specifier. 911 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 912 // data members and cannot be applied to names declared const or static, 913 // and cannot be applied to reference members. 914 switch (DS.getStorageClassSpec()) { 915 case DeclSpec::SCS_unspecified: 916 case DeclSpec::SCS_typedef: 917 case DeclSpec::SCS_static: 918 // FALL THROUGH. 919 break; 920 case DeclSpec::SCS_mutable: 921 if (isFunc) { 922 if (DS.getStorageClassSpecLoc().isValid()) 923 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 924 else 925 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 926 927 // FIXME: It would be nicer if the keyword was ignored only for this 928 // declarator. Otherwise we could get follow-up errors. 929 D.getMutableDeclSpec().ClearStorageClassSpecs(); 930 } 931 break; 932 default: 933 if (DS.getStorageClassSpecLoc().isValid()) 934 Diag(DS.getStorageClassSpecLoc(), 935 diag::err_storageclass_invalid_for_member); 936 else 937 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 938 D.getMutableDeclSpec().ClearStorageClassSpecs(); 939 } 940 941 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 942 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 943 !isFunc); 944 945 Decl *Member; 946 if (isInstField) { 947 // FIXME: Check for template parameters! 948 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 949 AS); 950 assert(Member && "HandleField never returns null"); 951 } else { 952 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 953 if (!Member) { 954 return 0; 955 } 956 957 // Non-instance-fields can't have a bitfield. 958 if (BitWidth) { 959 if (Member->isInvalidDecl()) { 960 // don't emit another diagnostic. 961 } else if (isa<VarDecl>(Member)) { 962 // C++ 9.6p3: A bit-field shall not be a static member. 963 // "static member 'A' cannot be a bit-field" 964 Diag(Loc, diag::err_static_not_bitfield) 965 << Name << BitWidth->getSourceRange(); 966 } else if (isa<TypedefDecl>(Member)) { 967 // "typedef member 'x' cannot be a bit-field" 968 Diag(Loc, diag::err_typedef_not_bitfield) 969 << Name << BitWidth->getSourceRange(); 970 } else { 971 // A function typedef ("typedef int f(); f a;"). 972 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 973 Diag(Loc, diag::err_not_integral_type_bitfield) 974 << Name << cast<ValueDecl>(Member)->getType() 975 << BitWidth->getSourceRange(); 976 } 977 978 BitWidth = 0; 979 Member->setInvalidDecl(); 980 } 981 982 Member->setAccess(AS); 983 984 // If we have declared a member function template, set the access of the 985 // templated declaration as well. 986 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 987 FunTmpl->getTemplatedDecl()->setAccess(AS); 988 } 989 990 assert((Name || isInstField) && "No identifier for non-field ?"); 991 992 if (Init) 993 AddInitializerToDecl(Member, Init, false); 994 if (Deleted) // FIXME: Source location is not very good. 995 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 996 997 if (isInstField) { 998 FieldCollector->Add(cast<FieldDecl>(Member)); 999 return 0; 1000 } 1001 return Member; 1002} 1003 1004/// \brief Find the direct and/or virtual base specifiers that 1005/// correspond to the given base type, for use in base initialization 1006/// within a constructor. 1007static bool FindBaseInitializer(Sema &SemaRef, 1008 CXXRecordDecl *ClassDecl, 1009 QualType BaseType, 1010 const CXXBaseSpecifier *&DirectBaseSpec, 1011 const CXXBaseSpecifier *&VirtualBaseSpec) { 1012 // First, check for a direct base class. 1013 DirectBaseSpec = 0; 1014 for (CXXRecordDecl::base_class_const_iterator Base 1015 = ClassDecl->bases_begin(); 1016 Base != ClassDecl->bases_end(); ++Base) { 1017 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1018 // We found a direct base of this type. That's what we're 1019 // initializing. 1020 DirectBaseSpec = &*Base; 1021 break; 1022 } 1023 } 1024 1025 // Check for a virtual base class. 1026 // FIXME: We might be able to short-circuit this if we know in advance that 1027 // there are no virtual bases. 1028 VirtualBaseSpec = 0; 1029 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1030 // We haven't found a base yet; search the class hierarchy for a 1031 // virtual base class. 1032 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1033 /*DetectVirtual=*/false); 1034 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1035 BaseType, Paths)) { 1036 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1037 Path != Paths.end(); ++Path) { 1038 if (Path->back().Base->isVirtual()) { 1039 VirtualBaseSpec = Path->back().Base; 1040 break; 1041 } 1042 } 1043 } 1044 } 1045 1046 return DirectBaseSpec || VirtualBaseSpec; 1047} 1048 1049/// ActOnMemInitializer - Handle a C++ member initializer. 1050MemInitResult 1051Sema::ActOnMemInitializer(Decl *ConstructorD, 1052 Scope *S, 1053 CXXScopeSpec &SS, 1054 IdentifierInfo *MemberOrBase, 1055 ParsedType TemplateTypeTy, 1056 SourceLocation IdLoc, 1057 SourceLocation LParenLoc, 1058 ExprTy **Args, unsigned NumArgs, 1059 SourceLocation RParenLoc) { 1060 if (!ConstructorD) 1061 return true; 1062 1063 AdjustDeclIfTemplate(ConstructorD); 1064 1065 CXXConstructorDecl *Constructor 1066 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1067 if (!Constructor) { 1068 // The user wrote a constructor initializer on a function that is 1069 // not a C++ constructor. Ignore the error for now, because we may 1070 // have more member initializers coming; we'll diagnose it just 1071 // once in ActOnMemInitializers. 1072 return true; 1073 } 1074 1075 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1076 1077 // C++ [class.base.init]p2: 1078 // Names in a mem-initializer-id are looked up in the scope of the 1079 // constructor’s class and, if not found in that scope, are looked 1080 // up in the scope containing the constructor’s 1081 // definition. [Note: if the constructor’s class contains a member 1082 // with the same name as a direct or virtual base class of the 1083 // class, a mem-initializer-id naming the member or base class and 1084 // composed of a single identifier refers to the class member. A 1085 // mem-initializer-id for the hidden base class may be specified 1086 // using a qualified name. ] 1087 if (!SS.getScopeRep() && !TemplateTypeTy) { 1088 // Look for a member, first. 1089 FieldDecl *Member = 0; 1090 DeclContext::lookup_result Result 1091 = ClassDecl->lookup(MemberOrBase); 1092 if (Result.first != Result.second) 1093 Member = dyn_cast<FieldDecl>(*Result.first); 1094 1095 // FIXME: Handle members of an anonymous union. 1096 1097 if (Member) 1098 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1099 LParenLoc, RParenLoc); 1100 } 1101 // It didn't name a member, so see if it names a class. 1102 QualType BaseType; 1103 TypeSourceInfo *TInfo = 0; 1104 1105 if (TemplateTypeTy) { 1106 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1107 } else { 1108 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1109 LookupParsedName(R, S, &SS); 1110 1111 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1112 if (!TyD) { 1113 if (R.isAmbiguous()) return true; 1114 1115 // We don't want access-control diagnostics here. 1116 R.suppressDiagnostics(); 1117 1118 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1119 bool NotUnknownSpecialization = false; 1120 DeclContext *DC = computeDeclContext(SS, false); 1121 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1122 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1123 1124 if (!NotUnknownSpecialization) { 1125 // When the scope specifier can refer to a member of an unknown 1126 // specialization, we take it as a type name. 1127 BaseType = CheckTypenameType(ETK_None, 1128 (NestedNameSpecifier *)SS.getScopeRep(), 1129 *MemberOrBase, SourceLocation(), 1130 SS.getRange(), IdLoc); 1131 if (BaseType.isNull()) 1132 return true; 1133 1134 R.clear(); 1135 R.setLookupName(MemberOrBase); 1136 } 1137 } 1138 1139 // If no results were found, try to correct typos. 1140 if (R.empty() && BaseType.isNull() && 1141 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1142 R.isSingleResult()) { 1143 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1144 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1145 // We have found a non-static data member with a similar 1146 // name to what was typed; complain and initialize that 1147 // member. 1148 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1149 << MemberOrBase << true << R.getLookupName() 1150 << FixItHint::CreateReplacement(R.getNameLoc(), 1151 R.getLookupName().getAsString()); 1152 Diag(Member->getLocation(), diag::note_previous_decl) 1153 << Member->getDeclName(); 1154 1155 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1156 LParenLoc, RParenLoc); 1157 } 1158 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1159 const CXXBaseSpecifier *DirectBaseSpec; 1160 const CXXBaseSpecifier *VirtualBaseSpec; 1161 if (FindBaseInitializer(*this, ClassDecl, 1162 Context.getTypeDeclType(Type), 1163 DirectBaseSpec, VirtualBaseSpec)) { 1164 // We have found a direct or virtual base class with a 1165 // similar name to what was typed; complain and initialize 1166 // that base class. 1167 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1168 << MemberOrBase << false << R.getLookupName() 1169 << FixItHint::CreateReplacement(R.getNameLoc(), 1170 R.getLookupName().getAsString()); 1171 1172 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1173 : VirtualBaseSpec; 1174 Diag(BaseSpec->getSourceRange().getBegin(), 1175 diag::note_base_class_specified_here) 1176 << BaseSpec->getType() 1177 << BaseSpec->getSourceRange(); 1178 1179 TyD = Type; 1180 } 1181 } 1182 } 1183 1184 if (!TyD && BaseType.isNull()) { 1185 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1186 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1187 return true; 1188 } 1189 } 1190 1191 if (BaseType.isNull()) { 1192 BaseType = Context.getTypeDeclType(TyD); 1193 if (SS.isSet()) { 1194 NestedNameSpecifier *Qualifier = 1195 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1196 1197 // FIXME: preserve source range information 1198 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1199 } 1200 } 1201 } 1202 1203 if (!TInfo) 1204 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1205 1206 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1207 LParenLoc, RParenLoc, ClassDecl); 1208} 1209 1210/// Checks an initializer expression for use of uninitialized fields, such as 1211/// containing the field that is being initialized. Returns true if there is an 1212/// uninitialized field was used an updates the SourceLocation parameter; false 1213/// otherwise. 1214static bool InitExprContainsUninitializedFields(const Stmt *S, 1215 const FieldDecl *LhsField, 1216 SourceLocation *L) { 1217 if (isa<CallExpr>(S)) { 1218 // Do not descend into function calls or constructors, as the use 1219 // of an uninitialized field may be valid. One would have to inspect 1220 // the contents of the function/ctor to determine if it is safe or not. 1221 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1222 // may be safe, depending on what the function/ctor does. 1223 return false; 1224 } 1225 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1226 const NamedDecl *RhsField = ME->getMemberDecl(); 1227 if (RhsField == LhsField) { 1228 // Initializing a field with itself. Throw a warning. 1229 // But wait; there are exceptions! 1230 // Exception #1: The field may not belong to this record. 1231 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1232 const Expr *base = ME->getBase(); 1233 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1234 // Even though the field matches, it does not belong to this record. 1235 return false; 1236 } 1237 // None of the exceptions triggered; return true to indicate an 1238 // uninitialized field was used. 1239 *L = ME->getMemberLoc(); 1240 return true; 1241 } 1242 } else if (isa<SizeOfAlignOfExpr>(S)) { 1243 // sizeof/alignof doesn't reference contents, do not warn. 1244 return false; 1245 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1246 // address-of doesn't reference contents (the pointer may be dereferenced 1247 // in the same expression but it would be rare; and weird). 1248 if (UOE->getOpcode() == UO_AddrOf) 1249 return false; 1250 } 1251 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1252 it != e; ++it) { 1253 if (!*it) { 1254 // An expression such as 'member(arg ?: "")' may trigger this. 1255 continue; 1256 } 1257 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1258 return true; 1259 } 1260 return false; 1261} 1262 1263MemInitResult 1264Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1265 unsigned NumArgs, SourceLocation IdLoc, 1266 SourceLocation LParenLoc, 1267 SourceLocation RParenLoc) { 1268 // Diagnose value-uses of fields to initialize themselves, e.g. 1269 // foo(foo) 1270 // where foo is not also a parameter to the constructor. 1271 // TODO: implement -Wuninitialized and fold this into that framework. 1272 for (unsigned i = 0; i < NumArgs; ++i) { 1273 SourceLocation L; 1274 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1275 // FIXME: Return true in the case when other fields are used before being 1276 // uninitialized. For example, let this field be the i'th field. When 1277 // initializing the i'th field, throw a warning if any of the >= i'th 1278 // fields are used, as they are not yet initialized. 1279 // Right now we are only handling the case where the i'th field uses 1280 // itself in its initializer. 1281 Diag(L, diag::warn_field_is_uninit); 1282 } 1283 } 1284 1285 bool HasDependentArg = false; 1286 for (unsigned i = 0; i < NumArgs; i++) 1287 HasDependentArg |= Args[i]->isTypeDependent(); 1288 1289 if (Member->getType()->isDependentType() || HasDependentArg) { 1290 // Can't check initialization for a member of dependent type or when 1291 // any of the arguments are type-dependent expressions. 1292 Expr *Init 1293 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1294 RParenLoc); 1295 1296 // Erase any temporaries within this evaluation context; we're not 1297 // going to track them in the AST, since we'll be rebuilding the 1298 // ASTs during template instantiation. 1299 ExprTemporaries.erase( 1300 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1301 ExprTemporaries.end()); 1302 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init, 1306 RParenLoc); 1307 1308 } 1309 1310 if (Member->isInvalidDecl()) 1311 return true; 1312 1313 // Initialize the member. 1314 InitializedEntity MemberEntity = 1315 InitializedEntity::InitializeMember(Member, 0); 1316 InitializationKind Kind = 1317 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1318 1319 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1320 1321 ExprResult MemberInit = 1322 InitSeq.Perform(*this, MemberEntity, Kind, 1323 MultiExprArg(*this, Args, NumArgs), 0); 1324 if (MemberInit.isInvalid()) 1325 return true; 1326 1327 // C++0x [class.base.init]p7: 1328 // The initialization of each base and member constitutes a 1329 // full-expression. 1330 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // If we are in a dependent context, template instantiation will 1335 // perform this type-checking again. Just save the arguments that we 1336 // received in a ParenListExpr. 1337 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1338 // of the information that we have about the member 1339 // initializer. However, deconstructing the ASTs is a dicey process, 1340 // and this approach is far more likely to get the corner cases right. 1341 if (CurContext->isDependentContext()) { 1342 // Bump the reference count of all of the arguments. 1343 for (unsigned I = 0; I != NumArgs; ++I) 1344 Args[I]->Retain(); 1345 1346 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1347 RParenLoc); 1348 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1349 LParenLoc, 1350 Init, 1351 RParenLoc); 1352 } 1353 1354 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1355 LParenLoc, 1356 MemberInit.get(), 1357 RParenLoc); 1358} 1359 1360MemInitResult 1361Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1362 Expr **Args, unsigned NumArgs, 1363 SourceLocation LParenLoc, SourceLocation RParenLoc, 1364 CXXRecordDecl *ClassDecl) { 1365 bool HasDependentArg = false; 1366 for (unsigned i = 0; i < NumArgs; i++) 1367 HasDependentArg |= Args[i]->isTypeDependent(); 1368 1369 SourceLocation BaseLoc 1370 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1371 1372 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1373 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1374 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1375 1376 // C++ [class.base.init]p2: 1377 // [...] Unless the mem-initializer-id names a nonstatic data 1378 // member of the constructor’s class or a direct or virtual base 1379 // of that class, the mem-initializer is ill-formed. A 1380 // mem-initializer-list can initialize a base class using any 1381 // name that denotes that base class type. 1382 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1383 1384 // Check for direct and virtual base classes. 1385 const CXXBaseSpecifier *DirectBaseSpec = 0; 1386 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1387 if (!Dependent) { 1388 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1389 VirtualBaseSpec); 1390 1391 // C++ [base.class.init]p2: 1392 // Unless the mem-initializer-id names a nonstatic data member of the 1393 // constructor's class or a direct or virtual base of that class, the 1394 // mem-initializer is ill-formed. 1395 if (!DirectBaseSpec && !VirtualBaseSpec) { 1396 // If the class has any dependent bases, then it's possible that 1397 // one of those types will resolve to the same type as 1398 // BaseType. Therefore, just treat this as a dependent base 1399 // class initialization. FIXME: Should we try to check the 1400 // initialization anyway? It seems odd. 1401 if (ClassDecl->hasAnyDependentBases()) 1402 Dependent = true; 1403 else 1404 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1405 << BaseType << Context.getTypeDeclType(ClassDecl) 1406 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1407 } 1408 } 1409 1410 if (Dependent) { 1411 // Can't check initialization for a base of dependent type or when 1412 // any of the arguments are type-dependent expressions. 1413 ExprResult BaseInit 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 1417 // Erase any temporaries within this evaluation context; we're not 1418 // going to track them in the AST, since we'll be rebuilding the 1419 // ASTs during template instantiation. 1420 ExprTemporaries.erase( 1421 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1422 ExprTemporaries.end()); 1423 1424 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1425 /*IsVirtual=*/false, 1426 LParenLoc, 1427 BaseInit.takeAs<Expr>(), 1428 RParenLoc); 1429 } 1430 1431 // C++ [base.class.init]p2: 1432 // If a mem-initializer-id is ambiguous because it designates both 1433 // a direct non-virtual base class and an inherited virtual base 1434 // class, the mem-initializer is ill-formed. 1435 if (DirectBaseSpec && VirtualBaseSpec) 1436 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1437 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1438 1439 CXXBaseSpecifier *BaseSpec 1440 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1441 if (!BaseSpec) 1442 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1443 1444 // Initialize the base. 1445 InitializedEntity BaseEntity = 1446 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1447 InitializationKind Kind = 1448 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1449 1450 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1451 1452 ExprResult BaseInit = 1453 InitSeq.Perform(*this, BaseEntity, Kind, 1454 MultiExprArg(*this, Args, NumArgs), 0); 1455 if (BaseInit.isInvalid()) 1456 return true; 1457 1458 // C++0x [class.base.init]p7: 1459 // The initialization of each base and member constitutes a 1460 // full-expression. 1461 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1462 if (BaseInit.isInvalid()) 1463 return true; 1464 1465 // If we are in a dependent context, template instantiation will 1466 // perform this type-checking again. Just save the arguments that we 1467 // received in a ParenListExpr. 1468 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1469 // of the information that we have about the base 1470 // initializer. However, deconstructing the ASTs is a dicey process, 1471 // and this approach is far more likely to get the corner cases right. 1472 if (CurContext->isDependentContext()) { 1473 // Bump the reference count of all of the arguments. 1474 for (unsigned I = 0; I != NumArgs; ++I) 1475 Args[I]->Retain(); 1476 1477 ExprResult Init 1478 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1479 RParenLoc)); 1480 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1481 BaseSpec->isVirtual(), 1482 LParenLoc, 1483 Init.takeAs<Expr>(), 1484 RParenLoc); 1485 } 1486 1487 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1488 BaseSpec->isVirtual(), 1489 LParenLoc, 1490 BaseInit.takeAs<Expr>(), 1491 RParenLoc); 1492} 1493 1494/// ImplicitInitializerKind - How an implicit base or member initializer should 1495/// initialize its base or member. 1496enum ImplicitInitializerKind { 1497 IIK_Default, 1498 IIK_Copy, 1499 IIK_Move 1500}; 1501 1502static bool 1503BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1504 ImplicitInitializerKind ImplicitInitKind, 1505 CXXBaseSpecifier *BaseSpec, 1506 bool IsInheritedVirtualBase, 1507 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1508 InitializedEntity InitEntity 1509 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1510 IsInheritedVirtualBase); 1511 1512 ExprResult BaseInit; 1513 1514 switch (ImplicitInitKind) { 1515 case IIK_Default: { 1516 InitializationKind InitKind 1517 = InitializationKind::CreateDefault(Constructor->getLocation()); 1518 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1519 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1520 MultiExprArg(SemaRef, 0, 0)); 1521 break; 1522 } 1523 1524 case IIK_Copy: { 1525 ParmVarDecl *Param = Constructor->getParamDecl(0); 1526 QualType ParamType = Param->getType().getNonReferenceType(); 1527 1528 Expr *CopyCtorArg = 1529 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1530 Constructor->getLocation(), ParamType, 0); 1531 1532 // Cast to the base class to avoid ambiguities. 1533 QualType ArgTy = 1534 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1535 ParamType.getQualifiers()); 1536 1537 CXXCastPath BasePath; 1538 BasePath.push_back(BaseSpec); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CK_UncheckedDerivedToBase, 1541 VK_LValue, &BasePath); 1542 1543 InitializationKind InitKind 1544 = InitializationKind::CreateDirect(Constructor->getLocation(), 1545 SourceLocation(), SourceLocation()); 1546 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1547 &CopyCtorArg, 1); 1548 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1549 MultiExprArg(&CopyCtorArg, 1)); 1550 break; 1551 } 1552 1553 case IIK_Move: 1554 assert(false && "Unhandled initializer kind!"); 1555 } 1556 1557 if (BaseInit.isInvalid()) 1558 return true; 1559 1560 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1561 if (BaseInit.isInvalid()) 1562 return true; 1563 1564 CXXBaseInit = 1565 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1566 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1567 SourceLocation()), 1568 BaseSpec->isVirtual(), 1569 SourceLocation(), 1570 BaseInit.takeAs<Expr>(), 1571 SourceLocation()); 1572 1573 return false; 1574} 1575 1576static bool 1577BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1578 ImplicitInitializerKind ImplicitInitKind, 1579 FieldDecl *Field, 1580 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1581 if (Field->isInvalidDecl()) 1582 return true; 1583 1584 SourceLocation Loc = Constructor->getLocation(); 1585 1586 if (ImplicitInitKind == IIK_Copy) { 1587 ParmVarDecl *Param = Constructor->getParamDecl(0); 1588 QualType ParamType = Param->getType().getNonReferenceType(); 1589 1590 Expr *MemberExprBase = 1591 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1592 Loc, ParamType, 0); 1593 1594 // Build a reference to this field within the parameter. 1595 CXXScopeSpec SS; 1596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1597 Sema::LookupMemberName); 1598 MemberLookup.addDecl(Field, AS_public); 1599 MemberLookup.resolveKind(); 1600 ExprResult CopyCtorArg 1601 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1602 ParamType, Loc, 1603 /*IsArrow=*/false, 1604 SS, 1605 /*FirstQualifierInScope=*/0, 1606 MemberLookup, 1607 /*TemplateArgs=*/0); 1608 if (CopyCtorArg.isInvalid()) 1609 return true; 1610 1611 // When the field we are copying is an array, create index variables for 1612 // each dimension of the array. We use these index variables to subscript 1613 // the source array, and other clients (e.g., CodeGen) will perform the 1614 // necessary iteration with these index variables. 1615 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1616 QualType BaseType = Field->getType(); 1617 QualType SizeType = SemaRef.Context.getSizeType(); 1618 while (const ConstantArrayType *Array 1619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1620 // Create the iteration variable for this array index. 1621 IdentifierInfo *IterationVarName = 0; 1622 { 1623 llvm::SmallString<8> Str; 1624 llvm::raw_svector_ostream OS(Str); 1625 OS << "__i" << IndexVariables.size(); 1626 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1627 } 1628 VarDecl *IterationVar 1629 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1630 IterationVarName, SizeType, 1631 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1632 SC_None, SC_None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 ExprResult IterationVarRef 1637 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1638 assert(!IterationVarRef.isInvalid() && 1639 "Reference to invented variable cannot fail!"); 1640 1641 // Subscript the array with this iteration variable. 1642 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1643 Loc, 1644 IterationVarRef.take(), 1645 Loc); 1646 if (CopyCtorArg.isInvalid()) 1647 return true; 1648 1649 BaseType = Array->getElementType(); 1650 } 1651 1652 // Construct the entity that we will be initializing. For an array, this 1653 // will be first element in the array, which may require several levels 1654 // of array-subscript entities. 1655 llvm::SmallVector<InitializedEntity, 4> Entities; 1656 Entities.reserve(1 + IndexVariables.size()); 1657 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1658 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1659 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1660 0, 1661 Entities.back())); 1662 1663 // Direct-initialize to use the copy constructor. 1664 InitializationKind InitKind = 1665 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1666 1667 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1668 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1669 &CopyCtorArgE, 1); 1670 1671 ExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 MultiExprArg(&CopyCtorArgE, 1)); 1674 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1675 if (MemberInit.isInvalid()) 1676 return true; 1677 1678 CXXMemberInit 1679 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1680 MemberInit.takeAs<Expr>(), Loc, 1681 IndexVariables.data(), 1682 IndexVariables.size()); 1683 return false; 1684 } 1685 1686 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1687 1688 QualType FieldBaseElementType = 1689 SemaRef.Context.getBaseElementType(Field->getType()); 1690 1691 if (FieldBaseElementType->isRecordType()) { 1692 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1693 InitializationKind InitKind = 1694 InitializationKind::CreateDefault(Loc); 1695 1696 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1697 ExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1699 if (MemberInit.isInvalid()) 1700 return true; 1701 1702 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1703 if (MemberInit.isInvalid()) 1704 return true; 1705 1706 CXXMemberInit = 1707 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1708 Field, Loc, Loc, 1709 MemberInit.get(), 1710 Loc); 1711 return false; 1712 } 1713 1714 if (FieldBaseElementType->isReferenceType()) { 1715 SemaRef.Diag(Constructor->getLocation(), 1716 diag::err_uninitialized_member_in_ctor) 1717 << (int)Constructor->isImplicit() 1718 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1719 << 0 << Field->getDeclName(); 1720 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1721 return true; 1722 } 1723 1724 if (FieldBaseElementType.isConstQualified()) { 1725 SemaRef.Diag(Constructor->getLocation(), 1726 diag::err_uninitialized_member_in_ctor) 1727 << (int)Constructor->isImplicit() 1728 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1729 << 1 << Field->getDeclName(); 1730 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1731 return true; 1732 } 1733 1734 // Nothing to initialize. 1735 CXXMemberInit = 0; 1736 return false; 1737} 1738 1739namespace { 1740struct BaseAndFieldInfo { 1741 Sema &S; 1742 CXXConstructorDecl *Ctor; 1743 bool AnyErrorsInInits; 1744 ImplicitInitializerKind IIK; 1745 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1746 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1747 1748 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1749 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1750 // FIXME: Handle implicit move constructors. 1751 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1752 IIK = IIK_Copy; 1753 else 1754 IIK = IIK_Default; 1755 } 1756}; 1757} 1758 1759static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1760 FieldDecl *Top, FieldDecl *Field, 1761 CXXBaseOrMemberInitializer *Init) { 1762 // If the member doesn't need to be initialized, Init will still be null. 1763 if (!Init) 1764 return; 1765 1766 Info.AllToInit.push_back(Init); 1767 if (Field != Top) { 1768 Init->setMember(Top); 1769 Init->setAnonUnionMember(Field); 1770 } 1771} 1772 1773static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1774 FieldDecl *Top, FieldDecl *Field) { 1775 1776 // Overwhelmingly common case: we have a direct initializer for this field. 1777 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1778 RecordFieldInitializer(Info, Top, Field, Init); 1779 return false; 1780 } 1781 1782 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1783 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1784 assert(FieldClassType && "anonymous struct/union without record type"); 1785 CXXRecordDecl *FieldClassDecl 1786 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1787 1788 // Even though union members never have non-trivial default 1789 // constructions in C++03, we still build member initializers for aggregate 1790 // record types which can be union members, and C++0x allows non-trivial 1791 // default constructors for union members, so we ensure that only one 1792 // member is initialized for these. 1793 if (FieldClassDecl->isUnion()) { 1794 // First check for an explicit initializer for one field. 1795 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1796 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1797 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1798 RecordFieldInitializer(Info, Top, *FA, Init); 1799 1800 // Once we've initialized a field of an anonymous union, the union 1801 // field in the class is also initialized, so exit immediately. 1802 return false; 1803 } else if ((*FA)->isAnonymousStructOrUnion()) { 1804 if (CollectFieldInitializer(Info, Top, *FA)) 1805 return true; 1806 } 1807 } 1808 1809 // Fallthrough and construct a default initializer for the union as 1810 // a whole, which can call its default constructor if such a thing exists 1811 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1812 // behavior going forward with C++0x, when anonymous unions there are 1813 // finalized, we should revisit this. 1814 } else { 1815 // For structs, we simply descend through to initialize all members where 1816 // necessary. 1817 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1818 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1819 if (CollectFieldInitializer(Info, Top, *FA)) 1820 return true; 1821 } 1822 } 1823 } 1824 1825 // Don't try to build an implicit initializer if there were semantic 1826 // errors in any of the initializers (and therefore we might be 1827 // missing some that the user actually wrote). 1828 if (Info.AnyErrorsInInits) 1829 return false; 1830 1831 CXXBaseOrMemberInitializer *Init = 0; 1832 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1833 return true; 1834 1835 RecordFieldInitializer(Info, Top, Field, Init); 1836 return false; 1837} 1838 1839bool 1840Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1841 CXXBaseOrMemberInitializer **Initializers, 1842 unsigned NumInitializers, 1843 bool AnyErrors) { 1844 if (Constructor->getDeclContext()->isDependentContext()) { 1845 // Just store the initializers as written, they will be checked during 1846 // instantiation. 1847 if (NumInitializers > 0) { 1848 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1849 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1850 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1851 memcpy(baseOrMemberInitializers, Initializers, 1852 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1853 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1854 } 1855 1856 return false; 1857 } 1858 1859 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1860 1861 // We need to build the initializer AST according to order of construction 1862 // and not what user specified in the Initializers list. 1863 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1864 if (!ClassDecl) 1865 return true; 1866 1867 bool HadError = false; 1868 1869 for (unsigned i = 0; i < NumInitializers; i++) { 1870 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1871 1872 if (Member->isBaseInitializer()) 1873 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1874 else 1875 Info.AllBaseFields[Member->getMember()] = Member; 1876 } 1877 1878 // Keep track of the direct virtual bases. 1879 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1880 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1881 E = ClassDecl->bases_end(); I != E; ++I) { 1882 if (I->isVirtual()) 1883 DirectVBases.insert(I); 1884 } 1885 1886 // Push virtual bases before others. 1887 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1888 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1889 1890 if (CXXBaseOrMemberInitializer *Value 1891 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1892 Info.AllToInit.push_back(Value); 1893 } else if (!AnyErrors) { 1894 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1895 CXXBaseOrMemberInitializer *CXXBaseInit; 1896 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1897 VBase, IsInheritedVirtualBase, 1898 CXXBaseInit)) { 1899 HadError = true; 1900 continue; 1901 } 1902 1903 Info.AllToInit.push_back(CXXBaseInit); 1904 } 1905 } 1906 1907 // Non-virtual bases. 1908 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1909 E = ClassDecl->bases_end(); Base != E; ++Base) { 1910 // Virtuals are in the virtual base list and already constructed. 1911 if (Base->isVirtual()) 1912 continue; 1913 1914 if (CXXBaseOrMemberInitializer *Value 1915 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1916 Info.AllToInit.push_back(Value); 1917 } else if (!AnyErrors) { 1918 CXXBaseOrMemberInitializer *CXXBaseInit; 1919 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1920 Base, /*IsInheritedVirtualBase=*/false, 1921 CXXBaseInit)) { 1922 HadError = true; 1923 continue; 1924 } 1925 1926 Info.AllToInit.push_back(CXXBaseInit); 1927 } 1928 } 1929 1930 // Fields. 1931 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1932 E = ClassDecl->field_end(); Field != E; ++Field) { 1933 if ((*Field)->getType()->isIncompleteArrayType()) { 1934 assert(ClassDecl->hasFlexibleArrayMember() && 1935 "Incomplete array type is not valid"); 1936 continue; 1937 } 1938 if (CollectFieldInitializer(Info, *Field, *Field)) 1939 HadError = true; 1940 } 1941 1942 NumInitializers = Info.AllToInit.size(); 1943 if (NumInitializers > 0) { 1944 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1945 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1946 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1947 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1948 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1949 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1950 1951 // Constructors implicitly reference the base and member 1952 // destructors. 1953 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1954 Constructor->getParent()); 1955 } 1956 1957 return HadError; 1958} 1959 1960static void *GetKeyForTopLevelField(FieldDecl *Field) { 1961 // For anonymous unions, use the class declaration as the key. 1962 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1963 if (RT->getDecl()->isAnonymousStructOrUnion()) 1964 return static_cast<void *>(RT->getDecl()); 1965 } 1966 return static_cast<void *>(Field); 1967} 1968 1969static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1970 return Context.getCanonicalType(BaseType).getTypePtr(); 1971} 1972 1973static void *GetKeyForMember(ASTContext &Context, 1974 CXXBaseOrMemberInitializer *Member, 1975 bool MemberMaybeAnon = false) { 1976 if (!Member->isMemberInitializer()) 1977 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1978 1979 // For fields injected into the class via declaration of an anonymous union, 1980 // use its anonymous union class declaration as the unique key. 1981 FieldDecl *Field = Member->getMember(); 1982 1983 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1984 // data member of the class. Data member used in the initializer list is 1985 // in AnonUnionMember field. 1986 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1987 Field = Member->getAnonUnionMember(); 1988 1989 // If the field is a member of an anonymous struct or union, our key 1990 // is the anonymous record decl that's a direct child of the class. 1991 RecordDecl *RD = Field->getParent(); 1992 if (RD->isAnonymousStructOrUnion()) { 1993 while (true) { 1994 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1995 if (Parent->isAnonymousStructOrUnion()) 1996 RD = Parent; 1997 else 1998 break; 1999 } 2000 2001 return static_cast<void *>(RD); 2002 } 2003 2004 return static_cast<void *>(Field); 2005} 2006 2007static void 2008DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2009 const CXXConstructorDecl *Constructor, 2010 CXXBaseOrMemberInitializer **Inits, 2011 unsigned NumInits) { 2012 if (Constructor->getDeclContext()->isDependentContext()) 2013 return; 2014 2015 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2016 == Diagnostic::Ignored) 2017 return; 2018 2019 // Build the list of bases and members in the order that they'll 2020 // actually be initialized. The explicit initializers should be in 2021 // this same order but may be missing things. 2022 llvm::SmallVector<const void*, 32> IdealInitKeys; 2023 2024 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2025 2026 // 1. Virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator VBase = 2028 ClassDecl->vbases_begin(), 2029 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2030 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2031 2032 // 2. Non-virtual bases. 2033 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2034 E = ClassDecl->bases_end(); Base != E; ++Base) { 2035 if (Base->isVirtual()) 2036 continue; 2037 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2038 } 2039 2040 // 3. Direct fields. 2041 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2042 E = ClassDecl->field_end(); Field != E; ++Field) 2043 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2044 2045 unsigned NumIdealInits = IdealInitKeys.size(); 2046 unsigned IdealIndex = 0; 2047 2048 CXXBaseOrMemberInitializer *PrevInit = 0; 2049 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2050 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2051 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2052 2053 // Scan forward to try to find this initializer in the idealized 2054 // initializers list. 2055 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2056 if (InitKey == IdealInitKeys[IdealIndex]) 2057 break; 2058 2059 // If we didn't find this initializer, it must be because we 2060 // scanned past it on a previous iteration. That can only 2061 // happen if we're out of order; emit a warning. 2062 if (IdealIndex == NumIdealInits && PrevInit) { 2063 Sema::SemaDiagnosticBuilder D = 2064 SemaRef.Diag(PrevInit->getSourceLocation(), 2065 diag::warn_initializer_out_of_order); 2066 2067 if (PrevInit->isMemberInitializer()) 2068 D << 0 << PrevInit->getMember()->getDeclName(); 2069 else 2070 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2071 2072 if (Init->isMemberInitializer()) 2073 D << 0 << Init->getMember()->getDeclName(); 2074 else 2075 D << 1 << Init->getBaseClassInfo()->getType(); 2076 2077 // Move back to the initializer's location in the ideal list. 2078 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2079 if (InitKey == IdealInitKeys[IdealIndex]) 2080 break; 2081 2082 assert(IdealIndex != NumIdealInits && 2083 "initializer not found in initializer list"); 2084 } 2085 2086 PrevInit = Init; 2087 } 2088} 2089 2090namespace { 2091bool CheckRedundantInit(Sema &S, 2092 CXXBaseOrMemberInitializer *Init, 2093 CXXBaseOrMemberInitializer *&PrevInit) { 2094 if (!PrevInit) { 2095 PrevInit = Init; 2096 return false; 2097 } 2098 2099 if (FieldDecl *Field = Init->getMember()) 2100 S.Diag(Init->getSourceLocation(), 2101 diag::err_multiple_mem_initialization) 2102 << Field->getDeclName() 2103 << Init->getSourceRange(); 2104 else { 2105 Type *BaseClass = Init->getBaseClass(); 2106 assert(BaseClass && "neither field nor base"); 2107 S.Diag(Init->getSourceLocation(), 2108 diag::err_multiple_base_initialization) 2109 << QualType(BaseClass, 0) 2110 << Init->getSourceRange(); 2111 } 2112 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2113 << 0 << PrevInit->getSourceRange(); 2114 2115 return true; 2116} 2117 2118typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2119typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2120 2121bool CheckRedundantUnionInit(Sema &S, 2122 CXXBaseOrMemberInitializer *Init, 2123 RedundantUnionMap &Unions) { 2124 FieldDecl *Field = Init->getMember(); 2125 RecordDecl *Parent = Field->getParent(); 2126 if (!Parent->isAnonymousStructOrUnion()) 2127 return false; 2128 2129 NamedDecl *Child = Field; 2130 do { 2131 if (Parent->isUnion()) { 2132 UnionEntry &En = Unions[Parent]; 2133 if (En.first && En.first != Child) { 2134 S.Diag(Init->getSourceLocation(), 2135 diag::err_multiple_mem_union_initialization) 2136 << Field->getDeclName() 2137 << Init->getSourceRange(); 2138 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2139 << 0 << En.second->getSourceRange(); 2140 return true; 2141 } else if (!En.first) { 2142 En.first = Child; 2143 En.second = Init; 2144 } 2145 } 2146 2147 Child = Parent; 2148 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2149 } while (Parent->isAnonymousStructOrUnion()); 2150 2151 return false; 2152} 2153} 2154 2155/// ActOnMemInitializers - Handle the member initializers for a constructor. 2156void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2157 SourceLocation ColonLoc, 2158 MemInitTy **meminits, unsigned NumMemInits, 2159 bool AnyErrors) { 2160 if (!ConstructorDecl) 2161 return; 2162 2163 AdjustDeclIfTemplate(ConstructorDecl); 2164 2165 CXXConstructorDecl *Constructor 2166 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2167 2168 if (!Constructor) { 2169 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2170 return; 2171 } 2172 2173 CXXBaseOrMemberInitializer **MemInits = 2174 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2175 2176 // Mapping for the duplicate initializers check. 2177 // For member initializers, this is keyed with a FieldDecl*. 2178 // For base initializers, this is keyed with a Type*. 2179 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2180 2181 // Mapping for the inconsistent anonymous-union initializers check. 2182 RedundantUnionMap MemberUnions; 2183 2184 bool HadError = false; 2185 for (unsigned i = 0; i < NumMemInits; i++) { 2186 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2187 2188 // Set the source order index. 2189 Init->setSourceOrder(i); 2190 2191 if (Init->isMemberInitializer()) { 2192 FieldDecl *Field = Init->getMember(); 2193 if (CheckRedundantInit(*this, Init, Members[Field]) || 2194 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2195 HadError = true; 2196 } else { 2197 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2198 if (CheckRedundantInit(*this, Init, Members[Key])) 2199 HadError = true; 2200 } 2201 } 2202 2203 if (HadError) 2204 return; 2205 2206 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2207 2208 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2209} 2210 2211void 2212Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2213 CXXRecordDecl *ClassDecl) { 2214 // Ignore dependent contexts. 2215 if (ClassDecl->isDependentContext()) 2216 return; 2217 2218 // FIXME: all the access-control diagnostics are positioned on the 2219 // field/base declaration. That's probably good; that said, the 2220 // user might reasonably want to know why the destructor is being 2221 // emitted, and we currently don't say. 2222 2223 // Non-static data members. 2224 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2225 E = ClassDecl->field_end(); I != E; ++I) { 2226 FieldDecl *Field = *I; 2227 if (Field->isInvalidDecl()) 2228 continue; 2229 QualType FieldType = Context.getBaseElementType(Field->getType()); 2230 2231 const RecordType* RT = FieldType->getAs<RecordType>(); 2232 if (!RT) 2233 continue; 2234 2235 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2236 if (FieldClassDecl->hasTrivialDestructor()) 2237 continue; 2238 2239 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2240 CheckDestructorAccess(Field->getLocation(), Dtor, 2241 PDiag(diag::err_access_dtor_field) 2242 << Field->getDeclName() 2243 << FieldType); 2244 2245 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2246 } 2247 2248 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2249 2250 // Bases. 2251 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2252 E = ClassDecl->bases_end(); Base != E; ++Base) { 2253 // Bases are always records in a well-formed non-dependent class. 2254 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2255 2256 // Remember direct virtual bases. 2257 if (Base->isVirtual()) 2258 DirectVirtualBases.insert(RT); 2259 2260 // Ignore trivial destructors. 2261 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2262 if (BaseClassDecl->hasTrivialDestructor()) 2263 continue; 2264 2265 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2266 2267 // FIXME: caret should be on the start of the class name 2268 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2269 PDiag(diag::err_access_dtor_base) 2270 << Base->getType() 2271 << Base->getSourceRange()); 2272 2273 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2274 } 2275 2276 // Virtual bases. 2277 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2278 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2279 2280 // Bases are always records in a well-formed non-dependent class. 2281 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2282 2283 // Ignore direct virtual bases. 2284 if (DirectVirtualBases.count(RT)) 2285 continue; 2286 2287 // Ignore trivial destructors. 2288 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2289 if (BaseClassDecl->hasTrivialDestructor()) 2290 continue; 2291 2292 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2293 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2294 PDiag(diag::err_access_dtor_vbase) 2295 << VBase->getType()); 2296 2297 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2298 } 2299} 2300 2301void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2302 if (!CDtorDecl) 2303 return; 2304 2305 if (CXXConstructorDecl *Constructor 2306 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2307 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2308} 2309 2310bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2311 unsigned DiagID, AbstractDiagSelID SelID) { 2312 if (SelID == -1) 2313 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2314 else 2315 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2316} 2317 2318bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2319 const PartialDiagnostic &PD) { 2320 if (!getLangOptions().CPlusPlus) 2321 return false; 2322 2323 if (const ArrayType *AT = Context.getAsArrayType(T)) 2324 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2325 2326 if (const PointerType *PT = T->getAs<PointerType>()) { 2327 // Find the innermost pointer type. 2328 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2329 PT = T; 2330 2331 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2332 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2333 } 2334 2335 const RecordType *RT = T->getAs<RecordType>(); 2336 if (!RT) 2337 return false; 2338 2339 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2340 2341 // We can't answer whether something is abstract until it has a 2342 // definition. If it's currently being defined, we'll walk back 2343 // over all the declarations when we have a full definition. 2344 const CXXRecordDecl *Def = RD->getDefinition(); 2345 if (!Def || Def->isBeingDefined()) 2346 return false; 2347 2348 if (!RD->isAbstract()) 2349 return false; 2350 2351 Diag(Loc, PD) << RD->getDeclName(); 2352 DiagnoseAbstractType(RD); 2353 2354 return true; 2355} 2356 2357void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2358 // Check if we've already emitted the list of pure virtual functions 2359 // for this class. 2360 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2361 return; 2362 2363 CXXFinalOverriderMap FinalOverriders; 2364 RD->getFinalOverriders(FinalOverriders); 2365 2366 // Keep a set of seen pure methods so we won't diagnose the same method 2367 // more than once. 2368 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2369 2370 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2371 MEnd = FinalOverriders.end(); 2372 M != MEnd; 2373 ++M) { 2374 for (OverridingMethods::iterator SO = M->second.begin(), 2375 SOEnd = M->second.end(); 2376 SO != SOEnd; ++SO) { 2377 // C++ [class.abstract]p4: 2378 // A class is abstract if it contains or inherits at least one 2379 // pure virtual function for which the final overrider is pure 2380 // virtual. 2381 2382 // 2383 if (SO->second.size() != 1) 2384 continue; 2385 2386 if (!SO->second.front().Method->isPure()) 2387 continue; 2388 2389 if (!SeenPureMethods.insert(SO->second.front().Method)) 2390 continue; 2391 2392 Diag(SO->second.front().Method->getLocation(), 2393 diag::note_pure_virtual_function) 2394 << SO->second.front().Method->getDeclName(); 2395 } 2396 } 2397 2398 if (!PureVirtualClassDiagSet) 2399 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2400 PureVirtualClassDiagSet->insert(RD); 2401} 2402 2403namespace { 2404struct AbstractUsageInfo { 2405 Sema &S; 2406 CXXRecordDecl *Record; 2407 CanQualType AbstractType; 2408 bool Invalid; 2409 2410 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2411 : S(S), Record(Record), 2412 AbstractType(S.Context.getCanonicalType( 2413 S.Context.getTypeDeclType(Record))), 2414 Invalid(false) {} 2415 2416 void DiagnoseAbstractType() { 2417 if (Invalid) return; 2418 S.DiagnoseAbstractType(Record); 2419 Invalid = true; 2420 } 2421 2422 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2423}; 2424 2425struct CheckAbstractUsage { 2426 AbstractUsageInfo &Info; 2427 const NamedDecl *Ctx; 2428 2429 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2430 : Info(Info), Ctx(Ctx) {} 2431 2432 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2433 switch (TL.getTypeLocClass()) { 2434#define ABSTRACT_TYPELOC(CLASS, PARENT) 2435#define TYPELOC(CLASS, PARENT) \ 2436 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2437#include "clang/AST/TypeLocNodes.def" 2438 } 2439 } 2440 2441 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2442 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2443 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2444 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2445 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2446 } 2447 } 2448 2449 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2450 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2451 } 2452 2453 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2454 // Visit the type parameters from a permissive context. 2455 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2456 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2457 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2458 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2459 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2460 // TODO: other template argument types? 2461 } 2462 } 2463 2464 // Visit pointee types from a permissive context. 2465#define CheckPolymorphic(Type) \ 2466 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2467 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2468 } 2469 CheckPolymorphic(PointerTypeLoc) 2470 CheckPolymorphic(ReferenceTypeLoc) 2471 CheckPolymorphic(MemberPointerTypeLoc) 2472 CheckPolymorphic(BlockPointerTypeLoc) 2473 2474 /// Handle all the types we haven't given a more specific 2475 /// implementation for above. 2476 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2477 // Every other kind of type that we haven't called out already 2478 // that has an inner type is either (1) sugar or (2) contains that 2479 // inner type in some way as a subobject. 2480 if (TypeLoc Next = TL.getNextTypeLoc()) 2481 return Visit(Next, Sel); 2482 2483 // If there's no inner type and we're in a permissive context, 2484 // don't diagnose. 2485 if (Sel == Sema::AbstractNone) return; 2486 2487 // Check whether the type matches the abstract type. 2488 QualType T = TL.getType(); 2489 if (T->isArrayType()) { 2490 Sel = Sema::AbstractArrayType; 2491 T = Info.S.Context.getBaseElementType(T); 2492 } 2493 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2494 if (CT != Info.AbstractType) return; 2495 2496 // It matched; do some magic. 2497 if (Sel == Sema::AbstractArrayType) { 2498 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2499 << T << TL.getSourceRange(); 2500 } else { 2501 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2502 << Sel << T << TL.getSourceRange(); 2503 } 2504 Info.DiagnoseAbstractType(); 2505 } 2506}; 2507 2508void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2509 Sema::AbstractDiagSelID Sel) { 2510 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2511} 2512 2513} 2514 2515/// Check for invalid uses of an abstract type in a method declaration. 2516static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2517 CXXMethodDecl *MD) { 2518 // No need to do the check on definitions, which require that 2519 // the return/param types be complete. 2520 if (MD->isThisDeclarationADefinition()) 2521 return; 2522 2523 // For safety's sake, just ignore it if we don't have type source 2524 // information. This should never happen for non-implicit methods, 2525 // but... 2526 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2527 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2528} 2529 2530/// Check for invalid uses of an abstract type within a class definition. 2531static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2532 CXXRecordDecl *RD) { 2533 for (CXXRecordDecl::decl_iterator 2534 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2535 Decl *D = *I; 2536 if (D->isImplicit()) continue; 2537 2538 // Methods and method templates. 2539 if (isa<CXXMethodDecl>(D)) { 2540 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2541 } else if (isa<FunctionTemplateDecl>(D)) { 2542 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2543 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2544 2545 // Fields and static variables. 2546 } else if (isa<FieldDecl>(D)) { 2547 FieldDecl *FD = cast<FieldDecl>(D); 2548 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2549 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2550 } else if (isa<VarDecl>(D)) { 2551 VarDecl *VD = cast<VarDecl>(D); 2552 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2553 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2554 2555 // Nested classes and class templates. 2556 } else if (isa<CXXRecordDecl>(D)) { 2557 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2558 } else if (isa<ClassTemplateDecl>(D)) { 2559 CheckAbstractClassUsage(Info, 2560 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2561 } 2562 } 2563} 2564 2565/// \brief Perform semantic checks on a class definition that has been 2566/// completing, introducing implicitly-declared members, checking for 2567/// abstract types, etc. 2568void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2569 if (!Record || Record->isInvalidDecl()) 2570 return; 2571 2572 if (!Record->isDependentType()) 2573 AddImplicitlyDeclaredMembersToClass(Record); 2574 2575 if (Record->isInvalidDecl()) 2576 return; 2577 2578 // Set access bits correctly on the directly-declared conversions. 2579 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2580 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2581 Convs->setAccess(I, (*I)->getAccess()); 2582 2583 // Determine whether we need to check for final overriders. We do 2584 // this either when there are virtual base classes (in which case we 2585 // may end up finding multiple final overriders for a given virtual 2586 // function) or any of the base classes is abstract (in which case 2587 // we might detect that this class is abstract). 2588 bool CheckFinalOverriders = false; 2589 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2590 !Record->isDependentType()) { 2591 if (Record->getNumVBases()) 2592 CheckFinalOverriders = true; 2593 else if (!Record->isAbstract()) { 2594 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2595 BEnd = Record->bases_end(); 2596 B != BEnd; ++B) { 2597 CXXRecordDecl *BaseDecl 2598 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2599 if (BaseDecl->isAbstract()) { 2600 CheckFinalOverriders = true; 2601 break; 2602 } 2603 } 2604 } 2605 } 2606 2607 if (CheckFinalOverriders) { 2608 CXXFinalOverriderMap FinalOverriders; 2609 Record->getFinalOverriders(FinalOverriders); 2610 2611 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2612 MEnd = FinalOverriders.end(); 2613 M != MEnd; ++M) { 2614 for (OverridingMethods::iterator SO = M->second.begin(), 2615 SOEnd = M->second.end(); 2616 SO != SOEnd; ++SO) { 2617 assert(SO->second.size() > 0 && 2618 "All virtual functions have overridding virtual functions"); 2619 if (SO->second.size() == 1) { 2620 // C++ [class.abstract]p4: 2621 // A class is abstract if it contains or inherits at least one 2622 // pure virtual function for which the final overrider is pure 2623 // virtual. 2624 if (SO->second.front().Method->isPure()) 2625 Record->setAbstract(true); 2626 continue; 2627 } 2628 2629 // C++ [class.virtual]p2: 2630 // In a derived class, if a virtual member function of a base 2631 // class subobject has more than one final overrider the 2632 // program is ill-formed. 2633 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2634 << (NamedDecl *)M->first << Record; 2635 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2636 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2637 OMEnd = SO->second.end(); 2638 OM != OMEnd; ++OM) 2639 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2640 << (NamedDecl *)M->first << OM->Method->getParent(); 2641 2642 Record->setInvalidDecl(); 2643 } 2644 } 2645 } 2646 2647 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2648 AbstractUsageInfo Info(*this, Record); 2649 CheckAbstractClassUsage(Info, Record); 2650 } 2651 2652 // If this is not an aggregate type and has no user-declared constructor, 2653 // complain about any non-static data members of reference or const scalar 2654 // type, since they will never get initializers. 2655 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2656 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2657 bool Complained = false; 2658 for (RecordDecl::field_iterator F = Record->field_begin(), 2659 FEnd = Record->field_end(); 2660 F != FEnd; ++F) { 2661 if (F->getType()->isReferenceType() || 2662 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2663 if (!Complained) { 2664 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2665 << Record->getTagKind() << Record; 2666 Complained = true; 2667 } 2668 2669 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2670 << F->getType()->isReferenceType() 2671 << F->getDeclName(); 2672 } 2673 } 2674 } 2675 2676 if (Record->isDynamicClass()) 2677 DynamicClasses.push_back(Record); 2678} 2679 2680void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2681 Decl *TagDecl, 2682 SourceLocation LBrac, 2683 SourceLocation RBrac, 2684 AttributeList *AttrList) { 2685 if (!TagDecl) 2686 return; 2687 2688 AdjustDeclIfTemplate(TagDecl); 2689 2690 ActOnFields(S, RLoc, TagDecl, 2691 // strict aliasing violation! 2692 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2693 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2694 2695 CheckCompletedCXXClass( 2696 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2697} 2698 2699namespace { 2700 /// \brief Helper class that collects exception specifications for 2701 /// implicitly-declared special member functions. 2702 class ImplicitExceptionSpecification { 2703 ASTContext &Context; 2704 bool AllowsAllExceptions; 2705 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2706 llvm::SmallVector<QualType, 4> Exceptions; 2707 2708 public: 2709 explicit ImplicitExceptionSpecification(ASTContext &Context) 2710 : Context(Context), AllowsAllExceptions(false) { } 2711 2712 /// \brief Whether the special member function should have any 2713 /// exception specification at all. 2714 bool hasExceptionSpecification() const { 2715 return !AllowsAllExceptions; 2716 } 2717 2718 /// \brief Whether the special member function should have a 2719 /// throw(...) exception specification (a Microsoft extension). 2720 bool hasAnyExceptionSpecification() const { 2721 return false; 2722 } 2723 2724 /// \brief The number of exceptions in the exception specification. 2725 unsigned size() const { return Exceptions.size(); } 2726 2727 /// \brief The set of exceptions in the exception specification. 2728 const QualType *data() const { return Exceptions.data(); } 2729 2730 /// \brief Note that 2731 void CalledDecl(CXXMethodDecl *Method) { 2732 // If we already know that we allow all exceptions, do nothing. 2733 if (AllowsAllExceptions || !Method) 2734 return; 2735 2736 const FunctionProtoType *Proto 2737 = Method->getType()->getAs<FunctionProtoType>(); 2738 2739 // If this function can throw any exceptions, make a note of that. 2740 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2741 AllowsAllExceptions = true; 2742 ExceptionsSeen.clear(); 2743 Exceptions.clear(); 2744 return; 2745 } 2746 2747 // Record the exceptions in this function's exception specification. 2748 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2749 EEnd = Proto->exception_end(); 2750 E != EEnd; ++E) 2751 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2752 Exceptions.push_back(*E); 2753 } 2754 }; 2755} 2756 2757 2758/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2759/// special functions, such as the default constructor, copy 2760/// constructor, or destructor, to the given C++ class (C++ 2761/// [special]p1). This routine can only be executed just before the 2762/// definition of the class is complete. 2763void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2764 if (!ClassDecl->hasUserDeclaredConstructor()) 2765 ++ASTContext::NumImplicitDefaultConstructors; 2766 2767 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2768 ++ASTContext::NumImplicitCopyConstructors; 2769 2770 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2771 ++ASTContext::NumImplicitCopyAssignmentOperators; 2772 2773 // If we have a dynamic class, then the copy assignment operator may be 2774 // virtual, so we have to declare it immediately. This ensures that, e.g., 2775 // it shows up in the right place in the vtable and that we diagnose 2776 // problems with the implicit exception specification. 2777 if (ClassDecl->isDynamicClass()) 2778 DeclareImplicitCopyAssignment(ClassDecl); 2779 } 2780 2781 if (!ClassDecl->hasUserDeclaredDestructor()) { 2782 ++ASTContext::NumImplicitDestructors; 2783 2784 // If we have a dynamic class, then the destructor may be virtual, so we 2785 // have to declare the destructor immediately. This ensures that, e.g., it 2786 // shows up in the right place in the vtable and that we diagnose problems 2787 // with the implicit exception specification. 2788 if (ClassDecl->isDynamicClass()) 2789 DeclareImplicitDestructor(ClassDecl); 2790 } 2791} 2792 2793void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2794 if (!D) 2795 return; 2796 2797 TemplateParameterList *Params = 0; 2798 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2799 Params = Template->getTemplateParameters(); 2800 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2801 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2802 Params = PartialSpec->getTemplateParameters(); 2803 else 2804 return; 2805 2806 for (TemplateParameterList::iterator Param = Params->begin(), 2807 ParamEnd = Params->end(); 2808 Param != ParamEnd; ++Param) { 2809 NamedDecl *Named = cast<NamedDecl>(*Param); 2810 if (Named->getDeclName()) { 2811 S->AddDecl(Named); 2812 IdResolver.AddDecl(Named); 2813 } 2814 } 2815} 2816 2817void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2818 if (!RecordD) return; 2819 AdjustDeclIfTemplate(RecordD); 2820 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2821 PushDeclContext(S, Record); 2822} 2823 2824void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2825 if (!RecordD) return; 2826 PopDeclContext(); 2827} 2828 2829/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2830/// parsing a top-level (non-nested) C++ class, and we are now 2831/// parsing those parts of the given Method declaration that could 2832/// not be parsed earlier (C++ [class.mem]p2), such as default 2833/// arguments. This action should enter the scope of the given 2834/// Method declaration as if we had just parsed the qualified method 2835/// name. However, it should not bring the parameters into scope; 2836/// that will be performed by ActOnDelayedCXXMethodParameter. 2837void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2838} 2839 2840/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2841/// C++ method declaration. We're (re-)introducing the given 2842/// function parameter into scope for use in parsing later parts of 2843/// the method declaration. For example, we could see an 2844/// ActOnParamDefaultArgument event for this parameter. 2845void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2846 if (!ParamD) 2847 return; 2848 2849 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2850 2851 // If this parameter has an unparsed default argument, clear it out 2852 // to make way for the parsed default argument. 2853 if (Param->hasUnparsedDefaultArg()) 2854 Param->setDefaultArg(0); 2855 2856 S->AddDecl(Param); 2857 if (Param->getDeclName()) 2858 IdResolver.AddDecl(Param); 2859} 2860 2861/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2862/// processing the delayed method declaration for Method. The method 2863/// declaration is now considered finished. There may be a separate 2864/// ActOnStartOfFunctionDef action later (not necessarily 2865/// immediately!) for this method, if it was also defined inside the 2866/// class body. 2867void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2868 if (!MethodD) 2869 return; 2870 2871 AdjustDeclIfTemplate(MethodD); 2872 2873 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2874 2875 // Now that we have our default arguments, check the constructor 2876 // again. It could produce additional diagnostics or affect whether 2877 // the class has implicitly-declared destructors, among other 2878 // things. 2879 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2880 CheckConstructor(Constructor); 2881 2882 // Check the default arguments, which we may have added. 2883 if (!Method->isInvalidDecl()) 2884 CheckCXXDefaultArguments(Method); 2885} 2886 2887/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2888/// the well-formedness of the constructor declarator @p D with type @p 2889/// R. If there are any errors in the declarator, this routine will 2890/// emit diagnostics and set the invalid bit to true. In any case, the type 2891/// will be updated to reflect a well-formed type for the constructor and 2892/// returned. 2893QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2894 StorageClass &SC) { 2895 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2896 2897 // C++ [class.ctor]p3: 2898 // A constructor shall not be virtual (10.3) or static (9.4). A 2899 // constructor can be invoked for a const, volatile or const 2900 // volatile object. A constructor shall not be declared const, 2901 // volatile, or const volatile (9.3.2). 2902 if (isVirtual) { 2903 if (!D.isInvalidType()) 2904 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2905 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2906 << SourceRange(D.getIdentifierLoc()); 2907 D.setInvalidType(); 2908 } 2909 if (SC == SC_Static) { 2910 if (!D.isInvalidType()) 2911 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2912 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2913 << SourceRange(D.getIdentifierLoc()); 2914 D.setInvalidType(); 2915 SC = SC_None; 2916 } 2917 2918 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2919 if (FTI.TypeQuals != 0) { 2920 if (FTI.TypeQuals & Qualifiers::Const) 2921 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2922 << "const" << SourceRange(D.getIdentifierLoc()); 2923 if (FTI.TypeQuals & Qualifiers::Volatile) 2924 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2925 << "volatile" << SourceRange(D.getIdentifierLoc()); 2926 if (FTI.TypeQuals & Qualifiers::Restrict) 2927 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2928 << "restrict" << SourceRange(D.getIdentifierLoc()); 2929 } 2930 2931 // Rebuild the function type "R" without any type qualifiers (in 2932 // case any of the errors above fired) and with "void" as the 2933 // return type, since constructors don't have return types. 2934 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2935 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2936 Proto->getNumArgs(), 2937 Proto->isVariadic(), 0, 2938 Proto->hasExceptionSpec(), 2939 Proto->hasAnyExceptionSpec(), 2940 Proto->getNumExceptions(), 2941 Proto->exception_begin(), 2942 Proto->getExtInfo()); 2943} 2944 2945/// CheckConstructor - Checks a fully-formed constructor for 2946/// well-formedness, issuing any diagnostics required. Returns true if 2947/// the constructor declarator is invalid. 2948void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2949 CXXRecordDecl *ClassDecl 2950 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2951 if (!ClassDecl) 2952 return Constructor->setInvalidDecl(); 2953 2954 // C++ [class.copy]p3: 2955 // A declaration of a constructor for a class X is ill-formed if 2956 // its first parameter is of type (optionally cv-qualified) X and 2957 // either there are no other parameters or else all other 2958 // parameters have default arguments. 2959 if (!Constructor->isInvalidDecl() && 2960 ((Constructor->getNumParams() == 1) || 2961 (Constructor->getNumParams() > 1 && 2962 Constructor->getParamDecl(1)->hasDefaultArg())) && 2963 Constructor->getTemplateSpecializationKind() 2964 != TSK_ImplicitInstantiation) { 2965 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2966 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2967 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2968 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2969 const char *ConstRef 2970 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2971 : " const &"; 2972 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2973 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2974 2975 // FIXME: Rather that making the constructor invalid, we should endeavor 2976 // to fix the type. 2977 Constructor->setInvalidDecl(); 2978 } 2979 } 2980} 2981 2982/// CheckDestructor - Checks a fully-formed destructor definition for 2983/// well-formedness, issuing any diagnostics required. Returns true 2984/// on error. 2985bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2986 CXXRecordDecl *RD = Destructor->getParent(); 2987 2988 if (Destructor->isVirtual()) { 2989 SourceLocation Loc; 2990 2991 if (!Destructor->isImplicit()) 2992 Loc = Destructor->getLocation(); 2993 else 2994 Loc = RD->getLocation(); 2995 2996 // If we have a virtual destructor, look up the deallocation function 2997 FunctionDecl *OperatorDelete = 0; 2998 DeclarationName Name = 2999 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3000 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3001 return true; 3002 3003 MarkDeclarationReferenced(Loc, OperatorDelete); 3004 3005 Destructor->setOperatorDelete(OperatorDelete); 3006 } 3007 3008 return false; 3009} 3010 3011static inline bool 3012FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3013 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3014 FTI.ArgInfo[0].Param && 3015 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3016} 3017 3018/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3019/// the well-formednes of the destructor declarator @p D with type @p 3020/// R. If there are any errors in the declarator, this routine will 3021/// emit diagnostics and set the declarator to invalid. Even if this happens, 3022/// will be updated to reflect a well-formed type for the destructor and 3023/// returned. 3024QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3025 StorageClass& SC) { 3026 // C++ [class.dtor]p1: 3027 // [...] A typedef-name that names a class is a class-name 3028 // (7.1.3); however, a typedef-name that names a class shall not 3029 // be used as the identifier in the declarator for a destructor 3030 // declaration. 3031 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3032 if (isa<TypedefType>(DeclaratorType)) 3033 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3034 << DeclaratorType; 3035 3036 // C++ [class.dtor]p2: 3037 // A destructor is used to destroy objects of its class type. A 3038 // destructor takes no parameters, and no return type can be 3039 // specified for it (not even void). The address of a destructor 3040 // shall not be taken. A destructor shall not be static. A 3041 // destructor can be invoked for a const, volatile or const 3042 // volatile object. A destructor shall not be declared const, 3043 // volatile or const volatile (9.3.2). 3044 if (SC == SC_Static) { 3045 if (!D.isInvalidType()) 3046 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3047 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3048 << SourceRange(D.getIdentifierLoc()) 3049 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3050 3051 SC = SC_None; 3052 } 3053 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3054 // Destructors don't have return types, but the parser will 3055 // happily parse something like: 3056 // 3057 // class X { 3058 // float ~X(); 3059 // }; 3060 // 3061 // The return type will be eliminated later. 3062 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3063 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3064 << SourceRange(D.getIdentifierLoc()); 3065 } 3066 3067 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3068 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3069 if (FTI.TypeQuals & Qualifiers::Const) 3070 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3071 << "const" << SourceRange(D.getIdentifierLoc()); 3072 if (FTI.TypeQuals & Qualifiers::Volatile) 3073 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3074 << "volatile" << SourceRange(D.getIdentifierLoc()); 3075 if (FTI.TypeQuals & Qualifiers::Restrict) 3076 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3077 << "restrict" << SourceRange(D.getIdentifierLoc()); 3078 D.setInvalidType(); 3079 } 3080 3081 // Make sure we don't have any parameters. 3082 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3083 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3084 3085 // Delete the parameters. 3086 FTI.freeArgs(); 3087 D.setInvalidType(); 3088 } 3089 3090 // Make sure the destructor isn't variadic. 3091 if (FTI.isVariadic) { 3092 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3093 D.setInvalidType(); 3094 } 3095 3096 // Rebuild the function type "R" without any type qualifiers or 3097 // parameters (in case any of the errors above fired) and with 3098 // "void" as the return type, since destructors don't have return 3099 // types. 3100 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3101 if (!Proto) 3102 return QualType(); 3103 3104 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3105 Proto->hasExceptionSpec(), 3106 Proto->hasAnyExceptionSpec(), 3107 Proto->getNumExceptions(), 3108 Proto->exception_begin(), 3109 Proto->getExtInfo()); 3110} 3111 3112/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3113/// well-formednes of the conversion function declarator @p D with 3114/// type @p R. If there are any errors in the declarator, this routine 3115/// will emit diagnostics and return true. Otherwise, it will return 3116/// false. Either way, the type @p R will be updated to reflect a 3117/// well-formed type for the conversion operator. 3118void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3119 StorageClass& SC) { 3120 // C++ [class.conv.fct]p1: 3121 // Neither parameter types nor return type can be specified. The 3122 // type of a conversion function (8.3.5) is "function taking no 3123 // parameter returning conversion-type-id." 3124 if (SC == SC_Static) { 3125 if (!D.isInvalidType()) 3126 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3127 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3128 << SourceRange(D.getIdentifierLoc()); 3129 D.setInvalidType(); 3130 SC = SC_None; 3131 } 3132 3133 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3134 3135 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3136 // Conversion functions don't have return types, but the parser will 3137 // happily parse something like: 3138 // 3139 // class X { 3140 // float operator bool(); 3141 // }; 3142 // 3143 // The return type will be changed later anyway. 3144 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3145 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3146 << SourceRange(D.getIdentifierLoc()); 3147 D.setInvalidType(); 3148 } 3149 3150 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3151 3152 // Make sure we don't have any parameters. 3153 if (Proto->getNumArgs() > 0) { 3154 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3155 3156 // Delete the parameters. 3157 D.getTypeObject(0).Fun.freeArgs(); 3158 D.setInvalidType(); 3159 } else if (Proto->isVariadic()) { 3160 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3161 D.setInvalidType(); 3162 } 3163 3164 // Diagnose "&operator bool()" and other such nonsense. This 3165 // is actually a gcc extension which we don't support. 3166 if (Proto->getResultType() != ConvType) { 3167 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3168 << Proto->getResultType(); 3169 D.setInvalidType(); 3170 ConvType = Proto->getResultType(); 3171 } 3172 3173 // C++ [class.conv.fct]p4: 3174 // The conversion-type-id shall not represent a function type nor 3175 // an array type. 3176 if (ConvType->isArrayType()) { 3177 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3178 ConvType = Context.getPointerType(ConvType); 3179 D.setInvalidType(); 3180 } else if (ConvType->isFunctionType()) { 3181 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3182 ConvType = Context.getPointerType(ConvType); 3183 D.setInvalidType(); 3184 } 3185 3186 // Rebuild the function type "R" without any parameters (in case any 3187 // of the errors above fired) and with the conversion type as the 3188 // return type. 3189 if (D.isInvalidType()) { 3190 R = Context.getFunctionType(ConvType, 0, 0, false, 3191 Proto->getTypeQuals(), 3192 Proto->hasExceptionSpec(), 3193 Proto->hasAnyExceptionSpec(), 3194 Proto->getNumExceptions(), 3195 Proto->exception_begin(), 3196 Proto->getExtInfo()); 3197 } 3198 3199 // C++0x explicit conversion operators. 3200 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3201 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3202 diag::warn_explicit_conversion_functions) 3203 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3204} 3205 3206/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3207/// the declaration of the given C++ conversion function. This routine 3208/// is responsible for recording the conversion function in the C++ 3209/// class, if possible. 3210Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3211 assert(Conversion && "Expected to receive a conversion function declaration"); 3212 3213 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3214 3215 // Make sure we aren't redeclaring the conversion function. 3216 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3217 3218 // C++ [class.conv.fct]p1: 3219 // [...] A conversion function is never used to convert a 3220 // (possibly cv-qualified) object to the (possibly cv-qualified) 3221 // same object type (or a reference to it), to a (possibly 3222 // cv-qualified) base class of that type (or a reference to it), 3223 // or to (possibly cv-qualified) void. 3224 // FIXME: Suppress this warning if the conversion function ends up being a 3225 // virtual function that overrides a virtual function in a base class. 3226 QualType ClassType 3227 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3228 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3229 ConvType = ConvTypeRef->getPointeeType(); 3230 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3231 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3232 /* Suppress diagnostics for instantiations. */; 3233 else if (ConvType->isRecordType()) { 3234 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3235 if (ConvType == ClassType) 3236 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3237 << ClassType; 3238 else if (IsDerivedFrom(ClassType, ConvType)) 3239 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3240 << ClassType << ConvType; 3241 } else if (ConvType->isVoidType()) { 3242 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3243 << ClassType << ConvType; 3244 } 3245 3246 if (Conversion->getPrimaryTemplate()) { 3247 // ignore specializations 3248 } else if (Conversion->getPreviousDeclaration()) { 3249 if (FunctionTemplateDecl *ConversionTemplate 3250 = Conversion->getDescribedFunctionTemplate()) { 3251 if (ClassDecl->replaceConversion( 3252 ConversionTemplate->getPreviousDeclaration(), 3253 ConversionTemplate)) 3254 return ConversionTemplate; 3255 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3256 Conversion)) 3257 return Conversion; 3258 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3259 } else if (FunctionTemplateDecl *ConversionTemplate 3260 = Conversion->getDescribedFunctionTemplate()) 3261 ClassDecl->addConversionFunction(ConversionTemplate); 3262 else 3263 ClassDecl->addConversionFunction(Conversion); 3264 3265 return Conversion; 3266} 3267 3268//===----------------------------------------------------------------------===// 3269// Namespace Handling 3270//===----------------------------------------------------------------------===// 3271 3272 3273 3274/// ActOnStartNamespaceDef - This is called at the start of a namespace 3275/// definition. 3276Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3277 SourceLocation InlineLoc, 3278 SourceLocation IdentLoc, 3279 IdentifierInfo *II, 3280 SourceLocation LBrace, 3281 AttributeList *AttrList) { 3282 // anonymous namespace starts at its left brace 3283 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3284 (II ? IdentLoc : LBrace) , II); 3285 Namespc->setLBracLoc(LBrace); 3286 Namespc->setInline(InlineLoc.isValid()); 3287 3288 Scope *DeclRegionScope = NamespcScope->getParent(); 3289 3290 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3291 3292 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3293 PushVisibilityAttr(attr); 3294 3295 if (II) { 3296 // C++ [namespace.def]p2: 3297 // The identifier in an original-namespace-definition shall not have been 3298 // previously defined in the declarative region in which the 3299 // original-namespace-definition appears. The identifier in an 3300 // original-namespace-definition is the name of the namespace. Subsequently 3301 // in that declarative region, it is treated as an original-namespace-name. 3302 3303 NamedDecl *PrevDecl 3304 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3305 ForRedeclaration); 3306 3307 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3308 // This is an extended namespace definition. 3309 if (Namespc->isInline() != OrigNS->isInline()) { 3310 // inline-ness must match 3311 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3312 << Namespc->isInline(); 3313 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3314 Namespc->setInvalidDecl(); 3315 // Recover by ignoring the new namespace's inline status. 3316 Namespc->setInline(OrigNS->isInline()); 3317 } 3318 3319 // Attach this namespace decl to the chain of extended namespace 3320 // definitions. 3321 OrigNS->setNextNamespace(Namespc); 3322 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3323 3324 // Remove the previous declaration from the scope. 3325 if (DeclRegionScope->isDeclScope(OrigNS)) { 3326 IdResolver.RemoveDecl(OrigNS); 3327 DeclRegionScope->RemoveDecl(OrigNS); 3328 } 3329 } else if (PrevDecl) { 3330 // This is an invalid name redefinition. 3331 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3332 << Namespc->getDeclName(); 3333 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3334 Namespc->setInvalidDecl(); 3335 // Continue on to push Namespc as current DeclContext and return it. 3336 } else if (II->isStr("std") && 3337 CurContext->getRedeclContext()->isTranslationUnit()) { 3338 // This is the first "real" definition of the namespace "std", so update 3339 // our cache of the "std" namespace to point at this definition. 3340 if (NamespaceDecl *StdNS = getStdNamespace()) { 3341 // We had already defined a dummy namespace "std". Link this new 3342 // namespace definition to the dummy namespace "std". 3343 StdNS->setNextNamespace(Namespc); 3344 StdNS->setLocation(IdentLoc); 3345 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3346 } 3347 3348 // Make our StdNamespace cache point at the first real definition of the 3349 // "std" namespace. 3350 StdNamespace = Namespc; 3351 } 3352 3353 PushOnScopeChains(Namespc, DeclRegionScope); 3354 } else { 3355 // Anonymous namespaces. 3356 assert(Namespc->isAnonymousNamespace()); 3357 3358 // Link the anonymous namespace into its parent. 3359 NamespaceDecl *PrevDecl; 3360 DeclContext *Parent = CurContext->getRedeclContext(); 3361 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3362 PrevDecl = TU->getAnonymousNamespace(); 3363 TU->setAnonymousNamespace(Namespc); 3364 } else { 3365 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3366 PrevDecl = ND->getAnonymousNamespace(); 3367 ND->setAnonymousNamespace(Namespc); 3368 } 3369 3370 // Link the anonymous namespace with its previous declaration. 3371 if (PrevDecl) { 3372 assert(PrevDecl->isAnonymousNamespace()); 3373 assert(!PrevDecl->getNextNamespace()); 3374 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3375 PrevDecl->setNextNamespace(Namespc); 3376 3377 if (Namespc->isInline() != PrevDecl->isInline()) { 3378 // inline-ness must match 3379 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3380 << Namespc->isInline(); 3381 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3382 Namespc->setInvalidDecl(); 3383 // Recover by ignoring the new namespace's inline status. 3384 Namespc->setInline(PrevDecl->isInline()); 3385 } 3386 } 3387 3388 CurContext->addDecl(Namespc); 3389 3390 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3391 // behaves as if it were replaced by 3392 // namespace unique { /* empty body */ } 3393 // using namespace unique; 3394 // namespace unique { namespace-body } 3395 // where all occurrences of 'unique' in a translation unit are 3396 // replaced by the same identifier and this identifier differs 3397 // from all other identifiers in the entire program. 3398 3399 // We just create the namespace with an empty name and then add an 3400 // implicit using declaration, just like the standard suggests. 3401 // 3402 // CodeGen enforces the "universally unique" aspect by giving all 3403 // declarations semantically contained within an anonymous 3404 // namespace internal linkage. 3405 3406 if (!PrevDecl) { 3407 UsingDirectiveDecl* UD 3408 = UsingDirectiveDecl::Create(Context, CurContext, 3409 /* 'using' */ LBrace, 3410 /* 'namespace' */ SourceLocation(), 3411 /* qualifier */ SourceRange(), 3412 /* NNS */ NULL, 3413 /* identifier */ SourceLocation(), 3414 Namespc, 3415 /* Ancestor */ CurContext); 3416 UD->setImplicit(); 3417 CurContext->addDecl(UD); 3418 } 3419 } 3420 3421 // Although we could have an invalid decl (i.e. the namespace name is a 3422 // redefinition), push it as current DeclContext and try to continue parsing. 3423 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3424 // for the namespace has the declarations that showed up in that particular 3425 // namespace definition. 3426 PushDeclContext(NamespcScope, Namespc); 3427 return Namespc; 3428} 3429 3430/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3431/// is a namespace alias, returns the namespace it points to. 3432static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3433 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3434 return AD->getNamespace(); 3435 return dyn_cast_or_null<NamespaceDecl>(D); 3436} 3437 3438/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3439/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3440void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3441 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3442 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3443 Namespc->setRBracLoc(RBrace); 3444 PopDeclContext(); 3445 if (Namespc->hasAttr<VisibilityAttr>()) 3446 PopPragmaVisibility(); 3447} 3448 3449CXXRecordDecl *Sema::getStdBadAlloc() const { 3450 return cast_or_null<CXXRecordDecl>( 3451 StdBadAlloc.get(Context.getExternalSource())); 3452} 3453 3454NamespaceDecl *Sema::getStdNamespace() const { 3455 return cast_or_null<NamespaceDecl>( 3456 StdNamespace.get(Context.getExternalSource())); 3457} 3458 3459/// \brief Retrieve the special "std" namespace, which may require us to 3460/// implicitly define the namespace. 3461NamespaceDecl *Sema::getOrCreateStdNamespace() { 3462 if (!StdNamespace) { 3463 // The "std" namespace has not yet been defined, so build one implicitly. 3464 StdNamespace = NamespaceDecl::Create(Context, 3465 Context.getTranslationUnitDecl(), 3466 SourceLocation(), 3467 &PP.getIdentifierTable().get("std")); 3468 getStdNamespace()->setImplicit(true); 3469 } 3470 3471 return getStdNamespace(); 3472} 3473 3474Decl *Sema::ActOnUsingDirective(Scope *S, 3475 SourceLocation UsingLoc, 3476 SourceLocation NamespcLoc, 3477 CXXScopeSpec &SS, 3478 SourceLocation IdentLoc, 3479 IdentifierInfo *NamespcName, 3480 AttributeList *AttrList) { 3481 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3482 assert(NamespcName && "Invalid NamespcName."); 3483 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3484 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3485 3486 UsingDirectiveDecl *UDir = 0; 3487 NestedNameSpecifier *Qualifier = 0; 3488 if (SS.isSet()) 3489 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3490 3491 // Lookup namespace name. 3492 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3493 LookupParsedName(R, S, &SS); 3494 if (R.isAmbiguous()) 3495 return 0; 3496 3497 if (R.empty()) { 3498 // Allow "using namespace std;" or "using namespace ::std;" even if 3499 // "std" hasn't been defined yet, for GCC compatibility. 3500 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3501 NamespcName->isStr("std")) { 3502 Diag(IdentLoc, diag::ext_using_undefined_std); 3503 R.addDecl(getOrCreateStdNamespace()); 3504 R.resolveKind(); 3505 } 3506 // Otherwise, attempt typo correction. 3507 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3508 CTC_NoKeywords, 0)) { 3509 if (R.getAsSingle<NamespaceDecl>() || 3510 R.getAsSingle<NamespaceAliasDecl>()) { 3511 if (DeclContext *DC = computeDeclContext(SS, false)) 3512 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3513 << NamespcName << DC << Corrected << SS.getRange() 3514 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3515 else 3516 Diag(IdentLoc, diag::err_using_directive_suggest) 3517 << NamespcName << Corrected 3518 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3519 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3520 << Corrected; 3521 3522 NamespcName = Corrected.getAsIdentifierInfo(); 3523 } else { 3524 R.clear(); 3525 R.setLookupName(NamespcName); 3526 } 3527 } 3528 } 3529 3530 if (!R.empty()) { 3531 NamedDecl *Named = R.getFoundDecl(); 3532 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3533 && "expected namespace decl"); 3534 // C++ [namespace.udir]p1: 3535 // A using-directive specifies that the names in the nominated 3536 // namespace can be used in the scope in which the 3537 // using-directive appears after the using-directive. During 3538 // unqualified name lookup (3.4.1), the names appear as if they 3539 // were declared in the nearest enclosing namespace which 3540 // contains both the using-directive and the nominated 3541 // namespace. [Note: in this context, "contains" means "contains 3542 // directly or indirectly". ] 3543 3544 // Find enclosing context containing both using-directive and 3545 // nominated namespace. 3546 NamespaceDecl *NS = getNamespaceDecl(Named); 3547 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3548 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3549 CommonAncestor = CommonAncestor->getParent(); 3550 3551 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3552 SS.getRange(), 3553 (NestedNameSpecifier *)SS.getScopeRep(), 3554 IdentLoc, Named, CommonAncestor); 3555 PushUsingDirective(S, UDir); 3556 } else { 3557 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3558 } 3559 3560 // FIXME: We ignore attributes for now. 3561 delete AttrList; 3562 return UDir; 3563} 3564 3565void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3566 // If scope has associated entity, then using directive is at namespace 3567 // or translation unit scope. We add UsingDirectiveDecls, into 3568 // it's lookup structure. 3569 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3570 Ctx->addDecl(UDir); 3571 else 3572 // Otherwise it is block-sope. using-directives will affect lookup 3573 // only to the end of scope. 3574 S->PushUsingDirective(UDir); 3575} 3576 3577 3578Decl *Sema::ActOnUsingDeclaration(Scope *S, 3579 AccessSpecifier AS, 3580 bool HasUsingKeyword, 3581 SourceLocation UsingLoc, 3582 CXXScopeSpec &SS, 3583 UnqualifiedId &Name, 3584 AttributeList *AttrList, 3585 bool IsTypeName, 3586 SourceLocation TypenameLoc) { 3587 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3588 3589 switch (Name.getKind()) { 3590 case UnqualifiedId::IK_Identifier: 3591 case UnqualifiedId::IK_OperatorFunctionId: 3592 case UnqualifiedId::IK_LiteralOperatorId: 3593 case UnqualifiedId::IK_ConversionFunctionId: 3594 break; 3595 3596 case UnqualifiedId::IK_ConstructorName: 3597 case UnqualifiedId::IK_ConstructorTemplateId: 3598 // C++0x inherited constructors. 3599 if (getLangOptions().CPlusPlus0x) break; 3600 3601 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3602 << SS.getRange(); 3603 return 0; 3604 3605 case UnqualifiedId::IK_DestructorName: 3606 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3607 << SS.getRange(); 3608 return 0; 3609 3610 case UnqualifiedId::IK_TemplateId: 3611 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3612 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3613 return 0; 3614 } 3615 3616 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3617 DeclarationName TargetName = TargetNameInfo.getName(); 3618 if (!TargetName) 3619 return 0; 3620 3621 // Warn about using declarations. 3622 // TODO: store that the declaration was written without 'using' and 3623 // talk about access decls instead of using decls in the 3624 // diagnostics. 3625 if (!HasUsingKeyword) { 3626 UsingLoc = Name.getSourceRange().getBegin(); 3627 3628 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3629 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3630 } 3631 3632 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3633 TargetNameInfo, AttrList, 3634 /* IsInstantiation */ false, 3635 IsTypeName, TypenameLoc); 3636 if (UD) 3637 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3638 3639 return UD; 3640} 3641 3642/// \brief Determine whether a using declaration considers the given 3643/// declarations as "equivalent", e.g., if they are redeclarations of 3644/// the same entity or are both typedefs of the same type. 3645static bool 3646IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3647 bool &SuppressRedeclaration) { 3648 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3649 SuppressRedeclaration = false; 3650 return true; 3651 } 3652 3653 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3654 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3655 SuppressRedeclaration = true; 3656 return Context.hasSameType(TD1->getUnderlyingType(), 3657 TD2->getUnderlyingType()); 3658 } 3659 3660 return false; 3661} 3662 3663 3664/// Determines whether to create a using shadow decl for a particular 3665/// decl, given the set of decls existing prior to this using lookup. 3666bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3667 const LookupResult &Previous) { 3668 // Diagnose finding a decl which is not from a base class of the 3669 // current class. We do this now because there are cases where this 3670 // function will silently decide not to build a shadow decl, which 3671 // will pre-empt further diagnostics. 3672 // 3673 // We don't need to do this in C++0x because we do the check once on 3674 // the qualifier. 3675 // 3676 // FIXME: diagnose the following if we care enough: 3677 // struct A { int foo; }; 3678 // struct B : A { using A::foo; }; 3679 // template <class T> struct C : A {}; 3680 // template <class T> struct D : C<T> { using B::foo; } // <--- 3681 // This is invalid (during instantiation) in C++03 because B::foo 3682 // resolves to the using decl in B, which is not a base class of D<T>. 3683 // We can't diagnose it immediately because C<T> is an unknown 3684 // specialization. The UsingShadowDecl in D<T> then points directly 3685 // to A::foo, which will look well-formed when we instantiate. 3686 // The right solution is to not collapse the shadow-decl chain. 3687 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3688 DeclContext *OrigDC = Orig->getDeclContext(); 3689 3690 // Handle enums and anonymous structs. 3691 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3692 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3693 while (OrigRec->isAnonymousStructOrUnion()) 3694 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3695 3696 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3697 if (OrigDC == CurContext) { 3698 Diag(Using->getLocation(), 3699 diag::err_using_decl_nested_name_specifier_is_current_class) 3700 << Using->getNestedNameRange(); 3701 Diag(Orig->getLocation(), diag::note_using_decl_target); 3702 return true; 3703 } 3704 3705 Diag(Using->getNestedNameRange().getBegin(), 3706 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3707 << Using->getTargetNestedNameDecl() 3708 << cast<CXXRecordDecl>(CurContext) 3709 << Using->getNestedNameRange(); 3710 Diag(Orig->getLocation(), diag::note_using_decl_target); 3711 return true; 3712 } 3713 } 3714 3715 if (Previous.empty()) return false; 3716 3717 NamedDecl *Target = Orig; 3718 if (isa<UsingShadowDecl>(Target)) 3719 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3720 3721 // If the target happens to be one of the previous declarations, we 3722 // don't have a conflict. 3723 // 3724 // FIXME: but we might be increasing its access, in which case we 3725 // should redeclare it. 3726 NamedDecl *NonTag = 0, *Tag = 0; 3727 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3728 I != E; ++I) { 3729 NamedDecl *D = (*I)->getUnderlyingDecl(); 3730 bool Result; 3731 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3732 return Result; 3733 3734 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3735 } 3736 3737 if (Target->isFunctionOrFunctionTemplate()) { 3738 FunctionDecl *FD; 3739 if (isa<FunctionTemplateDecl>(Target)) 3740 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3741 else 3742 FD = cast<FunctionDecl>(Target); 3743 3744 NamedDecl *OldDecl = 0; 3745 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3746 case Ovl_Overload: 3747 return false; 3748 3749 case Ovl_NonFunction: 3750 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3751 break; 3752 3753 // We found a decl with the exact signature. 3754 case Ovl_Match: 3755 // If we're in a record, we want to hide the target, so we 3756 // return true (without a diagnostic) to tell the caller not to 3757 // build a shadow decl. 3758 if (CurContext->isRecord()) 3759 return true; 3760 3761 // If we're not in a record, this is an error. 3762 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3763 break; 3764 } 3765 3766 Diag(Target->getLocation(), diag::note_using_decl_target); 3767 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3768 return true; 3769 } 3770 3771 // Target is not a function. 3772 3773 if (isa<TagDecl>(Target)) { 3774 // No conflict between a tag and a non-tag. 3775 if (!Tag) return false; 3776 3777 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3778 Diag(Target->getLocation(), diag::note_using_decl_target); 3779 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3780 return true; 3781 } 3782 3783 // No conflict between a tag and a non-tag. 3784 if (!NonTag) return false; 3785 3786 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3787 Diag(Target->getLocation(), diag::note_using_decl_target); 3788 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3789 return true; 3790} 3791 3792/// Builds a shadow declaration corresponding to a 'using' declaration. 3793UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3794 UsingDecl *UD, 3795 NamedDecl *Orig) { 3796 3797 // If we resolved to another shadow declaration, just coalesce them. 3798 NamedDecl *Target = Orig; 3799 if (isa<UsingShadowDecl>(Target)) { 3800 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3801 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3802 } 3803 3804 UsingShadowDecl *Shadow 3805 = UsingShadowDecl::Create(Context, CurContext, 3806 UD->getLocation(), UD, Target); 3807 UD->addShadowDecl(Shadow); 3808 3809 if (S) 3810 PushOnScopeChains(Shadow, S); 3811 else 3812 CurContext->addDecl(Shadow); 3813 Shadow->setAccess(UD->getAccess()); 3814 3815 // Register it as a conversion if appropriate. 3816 if (Shadow->getDeclName().getNameKind() 3817 == DeclarationName::CXXConversionFunctionName) 3818 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3819 3820 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3821 Shadow->setInvalidDecl(); 3822 3823 return Shadow; 3824} 3825 3826/// Hides a using shadow declaration. This is required by the current 3827/// using-decl implementation when a resolvable using declaration in a 3828/// class is followed by a declaration which would hide or override 3829/// one or more of the using decl's targets; for example: 3830/// 3831/// struct Base { void foo(int); }; 3832/// struct Derived : Base { 3833/// using Base::foo; 3834/// void foo(int); 3835/// }; 3836/// 3837/// The governing language is C++03 [namespace.udecl]p12: 3838/// 3839/// When a using-declaration brings names from a base class into a 3840/// derived class scope, member functions in the derived class 3841/// override and/or hide member functions with the same name and 3842/// parameter types in a base class (rather than conflicting). 3843/// 3844/// There are two ways to implement this: 3845/// (1) optimistically create shadow decls when they're not hidden 3846/// by existing declarations, or 3847/// (2) don't create any shadow decls (or at least don't make them 3848/// visible) until we've fully parsed/instantiated the class. 3849/// The problem with (1) is that we might have to retroactively remove 3850/// a shadow decl, which requires several O(n) operations because the 3851/// decl structures are (very reasonably) not designed for removal. 3852/// (2) avoids this but is very fiddly and phase-dependent. 3853void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3854 if (Shadow->getDeclName().getNameKind() == 3855 DeclarationName::CXXConversionFunctionName) 3856 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3857 3858 // Remove it from the DeclContext... 3859 Shadow->getDeclContext()->removeDecl(Shadow); 3860 3861 // ...and the scope, if applicable... 3862 if (S) { 3863 S->RemoveDecl(Shadow); 3864 IdResolver.RemoveDecl(Shadow); 3865 } 3866 3867 // ...and the using decl. 3868 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3869 3870 // TODO: complain somehow if Shadow was used. It shouldn't 3871 // be possible for this to happen, because...? 3872} 3873 3874/// Builds a using declaration. 3875/// 3876/// \param IsInstantiation - Whether this call arises from an 3877/// instantiation of an unresolved using declaration. We treat 3878/// the lookup differently for these declarations. 3879NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3880 SourceLocation UsingLoc, 3881 CXXScopeSpec &SS, 3882 const DeclarationNameInfo &NameInfo, 3883 AttributeList *AttrList, 3884 bool IsInstantiation, 3885 bool IsTypeName, 3886 SourceLocation TypenameLoc) { 3887 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3888 SourceLocation IdentLoc = NameInfo.getLoc(); 3889 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3890 3891 // FIXME: We ignore attributes for now. 3892 delete AttrList; 3893 3894 if (SS.isEmpty()) { 3895 Diag(IdentLoc, diag::err_using_requires_qualname); 3896 return 0; 3897 } 3898 3899 // Do the redeclaration lookup in the current scope. 3900 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3901 ForRedeclaration); 3902 Previous.setHideTags(false); 3903 if (S) { 3904 LookupName(Previous, S); 3905 3906 // It is really dumb that we have to do this. 3907 LookupResult::Filter F = Previous.makeFilter(); 3908 while (F.hasNext()) { 3909 NamedDecl *D = F.next(); 3910 if (!isDeclInScope(D, CurContext, S)) 3911 F.erase(); 3912 } 3913 F.done(); 3914 } else { 3915 assert(IsInstantiation && "no scope in non-instantiation"); 3916 assert(CurContext->isRecord() && "scope not record in instantiation"); 3917 LookupQualifiedName(Previous, CurContext); 3918 } 3919 3920 NestedNameSpecifier *NNS = 3921 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3922 3923 // Check for invalid redeclarations. 3924 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3925 return 0; 3926 3927 // Check for bad qualifiers. 3928 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3929 return 0; 3930 3931 DeclContext *LookupContext = computeDeclContext(SS); 3932 NamedDecl *D; 3933 if (!LookupContext) { 3934 if (IsTypeName) { 3935 // FIXME: not all declaration name kinds are legal here 3936 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3937 UsingLoc, TypenameLoc, 3938 SS.getRange(), NNS, 3939 IdentLoc, NameInfo.getName()); 3940 } else { 3941 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3942 UsingLoc, SS.getRange(), 3943 NNS, NameInfo); 3944 } 3945 } else { 3946 D = UsingDecl::Create(Context, CurContext, 3947 SS.getRange(), UsingLoc, NNS, NameInfo, 3948 IsTypeName); 3949 } 3950 D->setAccess(AS); 3951 CurContext->addDecl(D); 3952 3953 if (!LookupContext) return D; 3954 UsingDecl *UD = cast<UsingDecl>(D); 3955 3956 if (RequireCompleteDeclContext(SS, LookupContext)) { 3957 UD->setInvalidDecl(); 3958 return UD; 3959 } 3960 3961 // Look up the target name. 3962 3963 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3964 3965 // Unlike most lookups, we don't always want to hide tag 3966 // declarations: tag names are visible through the using declaration 3967 // even if hidden by ordinary names, *except* in a dependent context 3968 // where it's important for the sanity of two-phase lookup. 3969 if (!IsInstantiation) 3970 R.setHideTags(false); 3971 3972 LookupQualifiedName(R, LookupContext); 3973 3974 if (R.empty()) { 3975 Diag(IdentLoc, diag::err_no_member) 3976 << NameInfo.getName() << LookupContext << SS.getRange(); 3977 UD->setInvalidDecl(); 3978 return UD; 3979 } 3980 3981 if (R.isAmbiguous()) { 3982 UD->setInvalidDecl(); 3983 return UD; 3984 } 3985 3986 if (IsTypeName) { 3987 // If we asked for a typename and got a non-type decl, error out. 3988 if (!R.getAsSingle<TypeDecl>()) { 3989 Diag(IdentLoc, diag::err_using_typename_non_type); 3990 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3991 Diag((*I)->getUnderlyingDecl()->getLocation(), 3992 diag::note_using_decl_target); 3993 UD->setInvalidDecl(); 3994 return UD; 3995 } 3996 } else { 3997 // If we asked for a non-typename and we got a type, error out, 3998 // but only if this is an instantiation of an unresolved using 3999 // decl. Otherwise just silently find the type name. 4000 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4001 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4002 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4003 UD->setInvalidDecl(); 4004 return UD; 4005 } 4006 } 4007 4008 // C++0x N2914 [namespace.udecl]p6: 4009 // A using-declaration shall not name a namespace. 4010 if (R.getAsSingle<NamespaceDecl>()) { 4011 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4012 << SS.getRange(); 4013 UD->setInvalidDecl(); 4014 return UD; 4015 } 4016 4017 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4018 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4019 BuildUsingShadowDecl(S, UD, *I); 4020 } 4021 4022 return UD; 4023} 4024 4025/// Checks that the given using declaration is not an invalid 4026/// redeclaration. Note that this is checking only for the using decl 4027/// itself, not for any ill-formedness among the UsingShadowDecls. 4028bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4029 bool isTypeName, 4030 const CXXScopeSpec &SS, 4031 SourceLocation NameLoc, 4032 const LookupResult &Prev) { 4033 // C++03 [namespace.udecl]p8: 4034 // C++0x [namespace.udecl]p10: 4035 // A using-declaration is a declaration and can therefore be used 4036 // repeatedly where (and only where) multiple declarations are 4037 // allowed. 4038 // 4039 // That's in non-member contexts. 4040 if (!CurContext->getRedeclContext()->isRecord()) 4041 return false; 4042 4043 NestedNameSpecifier *Qual 4044 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4045 4046 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4047 NamedDecl *D = *I; 4048 4049 bool DTypename; 4050 NestedNameSpecifier *DQual; 4051 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4052 DTypename = UD->isTypeName(); 4053 DQual = UD->getTargetNestedNameDecl(); 4054 } else if (UnresolvedUsingValueDecl *UD 4055 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4056 DTypename = false; 4057 DQual = UD->getTargetNestedNameSpecifier(); 4058 } else if (UnresolvedUsingTypenameDecl *UD 4059 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4060 DTypename = true; 4061 DQual = UD->getTargetNestedNameSpecifier(); 4062 } else continue; 4063 4064 // using decls differ if one says 'typename' and the other doesn't. 4065 // FIXME: non-dependent using decls? 4066 if (isTypeName != DTypename) continue; 4067 4068 // using decls differ if they name different scopes (but note that 4069 // template instantiation can cause this check to trigger when it 4070 // didn't before instantiation). 4071 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4072 Context.getCanonicalNestedNameSpecifier(DQual)) 4073 continue; 4074 4075 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4076 Diag(D->getLocation(), diag::note_using_decl) << 1; 4077 return true; 4078 } 4079 4080 return false; 4081} 4082 4083 4084/// Checks that the given nested-name qualifier used in a using decl 4085/// in the current context is appropriately related to the current 4086/// scope. If an error is found, diagnoses it and returns true. 4087bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4088 const CXXScopeSpec &SS, 4089 SourceLocation NameLoc) { 4090 DeclContext *NamedContext = computeDeclContext(SS); 4091 4092 if (!CurContext->isRecord()) { 4093 // C++03 [namespace.udecl]p3: 4094 // C++0x [namespace.udecl]p8: 4095 // A using-declaration for a class member shall be a member-declaration. 4096 4097 // If we weren't able to compute a valid scope, it must be a 4098 // dependent class scope. 4099 if (!NamedContext || NamedContext->isRecord()) { 4100 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4101 << SS.getRange(); 4102 return true; 4103 } 4104 4105 // Otherwise, everything is known to be fine. 4106 return false; 4107 } 4108 4109 // The current scope is a record. 4110 4111 // If the named context is dependent, we can't decide much. 4112 if (!NamedContext) { 4113 // FIXME: in C++0x, we can diagnose if we can prove that the 4114 // nested-name-specifier does not refer to a base class, which is 4115 // still possible in some cases. 4116 4117 // Otherwise we have to conservatively report that things might be 4118 // okay. 4119 return false; 4120 } 4121 4122 if (!NamedContext->isRecord()) { 4123 // Ideally this would point at the last name in the specifier, 4124 // but we don't have that level of source info. 4125 Diag(SS.getRange().getBegin(), 4126 diag::err_using_decl_nested_name_specifier_is_not_class) 4127 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4128 return true; 4129 } 4130 4131 if (getLangOptions().CPlusPlus0x) { 4132 // C++0x [namespace.udecl]p3: 4133 // In a using-declaration used as a member-declaration, the 4134 // nested-name-specifier shall name a base class of the class 4135 // being defined. 4136 4137 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4138 cast<CXXRecordDecl>(NamedContext))) { 4139 if (CurContext == NamedContext) { 4140 Diag(NameLoc, 4141 diag::err_using_decl_nested_name_specifier_is_current_class) 4142 << SS.getRange(); 4143 return true; 4144 } 4145 4146 Diag(SS.getRange().getBegin(), 4147 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4148 << (NestedNameSpecifier*) SS.getScopeRep() 4149 << cast<CXXRecordDecl>(CurContext) 4150 << SS.getRange(); 4151 return true; 4152 } 4153 4154 return false; 4155 } 4156 4157 // C++03 [namespace.udecl]p4: 4158 // A using-declaration used as a member-declaration shall refer 4159 // to a member of a base class of the class being defined [etc.]. 4160 4161 // Salient point: SS doesn't have to name a base class as long as 4162 // lookup only finds members from base classes. Therefore we can 4163 // diagnose here only if we can prove that that can't happen, 4164 // i.e. if the class hierarchies provably don't intersect. 4165 4166 // TODO: it would be nice if "definitely valid" results were cached 4167 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4168 // need to be repeated. 4169 4170 struct UserData { 4171 llvm::DenseSet<const CXXRecordDecl*> Bases; 4172 4173 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4174 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4175 Data->Bases.insert(Base); 4176 return true; 4177 } 4178 4179 bool hasDependentBases(const CXXRecordDecl *Class) { 4180 return !Class->forallBases(collect, this); 4181 } 4182 4183 /// Returns true if the base is dependent or is one of the 4184 /// accumulated base classes. 4185 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4186 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4187 return !Data->Bases.count(Base); 4188 } 4189 4190 bool mightShareBases(const CXXRecordDecl *Class) { 4191 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4192 } 4193 }; 4194 4195 UserData Data; 4196 4197 // Returns false if we find a dependent base. 4198 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4199 return false; 4200 4201 // Returns false if the class has a dependent base or if it or one 4202 // of its bases is present in the base set of the current context. 4203 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4204 return false; 4205 4206 Diag(SS.getRange().getBegin(), 4207 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4208 << (NestedNameSpecifier*) SS.getScopeRep() 4209 << cast<CXXRecordDecl>(CurContext) 4210 << SS.getRange(); 4211 4212 return true; 4213} 4214 4215Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4216 SourceLocation NamespaceLoc, 4217 SourceLocation AliasLoc, 4218 IdentifierInfo *Alias, 4219 CXXScopeSpec &SS, 4220 SourceLocation IdentLoc, 4221 IdentifierInfo *Ident) { 4222 4223 // Lookup the namespace name. 4224 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4225 LookupParsedName(R, S, &SS); 4226 4227 // Check if we have a previous declaration with the same name. 4228 NamedDecl *PrevDecl 4229 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4230 ForRedeclaration); 4231 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4232 PrevDecl = 0; 4233 4234 if (PrevDecl) { 4235 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4236 // We already have an alias with the same name that points to the same 4237 // namespace, so don't create a new one. 4238 // FIXME: At some point, we'll want to create the (redundant) 4239 // declaration to maintain better source information. 4240 if (!R.isAmbiguous() && !R.empty() && 4241 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4242 return 0; 4243 } 4244 4245 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4246 diag::err_redefinition_different_kind; 4247 Diag(AliasLoc, DiagID) << Alias; 4248 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4249 return 0; 4250 } 4251 4252 if (R.isAmbiguous()) 4253 return 0; 4254 4255 if (R.empty()) { 4256 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4257 CTC_NoKeywords, 0)) { 4258 if (R.getAsSingle<NamespaceDecl>() || 4259 R.getAsSingle<NamespaceAliasDecl>()) { 4260 if (DeclContext *DC = computeDeclContext(SS, false)) 4261 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4262 << Ident << DC << Corrected << SS.getRange() 4263 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4264 else 4265 Diag(IdentLoc, diag::err_using_directive_suggest) 4266 << Ident << Corrected 4267 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4268 4269 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4270 << Corrected; 4271 4272 Ident = Corrected.getAsIdentifierInfo(); 4273 } else { 4274 R.clear(); 4275 R.setLookupName(Ident); 4276 } 4277 } 4278 4279 if (R.empty()) { 4280 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4281 return 0; 4282 } 4283 } 4284 4285 NamespaceAliasDecl *AliasDecl = 4286 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4287 Alias, SS.getRange(), 4288 (NestedNameSpecifier *)SS.getScopeRep(), 4289 IdentLoc, R.getFoundDecl()); 4290 4291 PushOnScopeChains(AliasDecl, S); 4292 return AliasDecl; 4293} 4294 4295namespace { 4296 /// \brief Scoped object used to handle the state changes required in Sema 4297 /// to implicitly define the body of a C++ member function; 4298 class ImplicitlyDefinedFunctionScope { 4299 Sema &S; 4300 DeclContext *PreviousContext; 4301 4302 public: 4303 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4304 : S(S), PreviousContext(S.CurContext) 4305 { 4306 S.CurContext = Method; 4307 S.PushFunctionScope(); 4308 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4309 } 4310 4311 ~ImplicitlyDefinedFunctionScope() { 4312 S.PopExpressionEvaluationContext(); 4313 S.PopFunctionOrBlockScope(); 4314 S.CurContext = PreviousContext; 4315 } 4316 }; 4317} 4318 4319static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4320 CXXRecordDecl *D) { 4321 ASTContext &Context = Self.Context; 4322 QualType ClassType = Context.getTypeDeclType(D); 4323 DeclarationName ConstructorName 4324 = Context.DeclarationNames.getCXXConstructorName( 4325 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4326 4327 DeclContext::lookup_const_iterator Con, ConEnd; 4328 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4329 Con != ConEnd; ++Con) { 4330 // FIXME: In C++0x, a constructor template can be a default constructor. 4331 if (isa<FunctionTemplateDecl>(*Con)) 4332 continue; 4333 4334 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4335 if (Constructor->isDefaultConstructor()) 4336 return Constructor; 4337 } 4338 return 0; 4339} 4340 4341CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4342 CXXRecordDecl *ClassDecl) { 4343 // C++ [class.ctor]p5: 4344 // A default constructor for a class X is a constructor of class X 4345 // that can be called without an argument. If there is no 4346 // user-declared constructor for class X, a default constructor is 4347 // implicitly declared. An implicitly-declared default constructor 4348 // is an inline public member of its class. 4349 assert(!ClassDecl->hasUserDeclaredConstructor() && 4350 "Should not build implicit default constructor!"); 4351 4352 // C++ [except.spec]p14: 4353 // An implicitly declared special member function (Clause 12) shall have an 4354 // exception-specification. [...] 4355 ImplicitExceptionSpecification ExceptSpec(Context); 4356 4357 // Direct base-class destructors. 4358 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4359 BEnd = ClassDecl->bases_end(); 4360 B != BEnd; ++B) { 4361 if (B->isVirtual()) // Handled below. 4362 continue; 4363 4364 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4365 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4366 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4367 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4368 else if (CXXConstructorDecl *Constructor 4369 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4370 ExceptSpec.CalledDecl(Constructor); 4371 } 4372 } 4373 4374 // Virtual base-class destructors. 4375 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4376 BEnd = ClassDecl->vbases_end(); 4377 B != BEnd; ++B) { 4378 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4379 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4380 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4381 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4382 else if (CXXConstructorDecl *Constructor 4383 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4384 ExceptSpec.CalledDecl(Constructor); 4385 } 4386 } 4387 4388 // Field destructors. 4389 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4390 FEnd = ClassDecl->field_end(); 4391 F != FEnd; ++F) { 4392 if (const RecordType *RecordTy 4393 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4394 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4395 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4396 ExceptSpec.CalledDecl( 4397 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4398 else if (CXXConstructorDecl *Constructor 4399 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4400 ExceptSpec.CalledDecl(Constructor); 4401 } 4402 } 4403 4404 4405 // Create the actual constructor declaration. 4406 CanQualType ClassType 4407 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4408 DeclarationName Name 4409 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4410 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4411 CXXConstructorDecl *DefaultCon 4412 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4413 Context.getFunctionType(Context.VoidTy, 4414 0, 0, false, 0, 4415 ExceptSpec.hasExceptionSpecification(), 4416 ExceptSpec.hasAnyExceptionSpecification(), 4417 ExceptSpec.size(), 4418 ExceptSpec.data(), 4419 FunctionType::ExtInfo()), 4420 /*TInfo=*/0, 4421 /*isExplicit=*/false, 4422 /*isInline=*/true, 4423 /*isImplicitlyDeclared=*/true); 4424 DefaultCon->setAccess(AS_public); 4425 DefaultCon->setImplicit(); 4426 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4427 4428 // Note that we have declared this constructor. 4429 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4430 4431 if (Scope *S = getScopeForContext(ClassDecl)) 4432 PushOnScopeChains(DefaultCon, S, false); 4433 ClassDecl->addDecl(DefaultCon); 4434 4435 return DefaultCon; 4436} 4437 4438void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4439 CXXConstructorDecl *Constructor) { 4440 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4441 !Constructor->isUsed(false)) && 4442 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4443 4444 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4445 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4446 4447 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4448 ErrorTrap Trap(*this); 4449 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4450 Trap.hasErrorOccurred()) { 4451 Diag(CurrentLocation, diag::note_member_synthesized_at) 4452 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4453 Constructor->setInvalidDecl(); 4454 return; 4455 } 4456 4457 SourceLocation Loc = Constructor->getLocation(); 4458 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4459 4460 Constructor->setUsed(); 4461 MarkVTableUsed(CurrentLocation, ClassDecl); 4462} 4463 4464CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4465 // C++ [class.dtor]p2: 4466 // If a class has no user-declared destructor, a destructor is 4467 // declared implicitly. An implicitly-declared destructor is an 4468 // inline public member of its class. 4469 4470 // C++ [except.spec]p14: 4471 // An implicitly declared special member function (Clause 12) shall have 4472 // an exception-specification. 4473 ImplicitExceptionSpecification ExceptSpec(Context); 4474 4475 // Direct base-class destructors. 4476 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4477 BEnd = ClassDecl->bases_end(); 4478 B != BEnd; ++B) { 4479 if (B->isVirtual()) // Handled below. 4480 continue; 4481 4482 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4483 ExceptSpec.CalledDecl( 4484 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4485 } 4486 4487 // Virtual base-class destructors. 4488 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4489 BEnd = ClassDecl->vbases_end(); 4490 B != BEnd; ++B) { 4491 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4492 ExceptSpec.CalledDecl( 4493 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4494 } 4495 4496 // Field destructors. 4497 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4498 FEnd = ClassDecl->field_end(); 4499 F != FEnd; ++F) { 4500 if (const RecordType *RecordTy 4501 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4502 ExceptSpec.CalledDecl( 4503 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4504 } 4505 4506 // Create the actual destructor declaration. 4507 QualType Ty = Context.getFunctionType(Context.VoidTy, 4508 0, 0, false, 0, 4509 ExceptSpec.hasExceptionSpecification(), 4510 ExceptSpec.hasAnyExceptionSpecification(), 4511 ExceptSpec.size(), 4512 ExceptSpec.data(), 4513 FunctionType::ExtInfo()); 4514 4515 CanQualType ClassType 4516 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4517 DeclarationName Name 4518 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4519 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4520 CXXDestructorDecl *Destructor 4521 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4522 /*isInline=*/true, 4523 /*isImplicitlyDeclared=*/true); 4524 Destructor->setAccess(AS_public); 4525 Destructor->setImplicit(); 4526 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4527 4528 // Note that we have declared this destructor. 4529 ++ASTContext::NumImplicitDestructorsDeclared; 4530 4531 // Introduce this destructor into its scope. 4532 if (Scope *S = getScopeForContext(ClassDecl)) 4533 PushOnScopeChains(Destructor, S, false); 4534 ClassDecl->addDecl(Destructor); 4535 4536 // This could be uniqued if it ever proves significant. 4537 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4538 4539 AddOverriddenMethods(ClassDecl, Destructor); 4540 4541 return Destructor; 4542} 4543 4544void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4545 CXXDestructorDecl *Destructor) { 4546 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4547 "DefineImplicitDestructor - call it for implicit default dtor"); 4548 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4549 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4550 4551 if (Destructor->isInvalidDecl()) 4552 return; 4553 4554 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4555 4556 ErrorTrap Trap(*this); 4557 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4558 Destructor->getParent()); 4559 4560 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4561 Diag(CurrentLocation, diag::note_member_synthesized_at) 4562 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4563 4564 Destructor->setInvalidDecl(); 4565 return; 4566 } 4567 4568 SourceLocation Loc = Destructor->getLocation(); 4569 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4570 4571 Destructor->setUsed(); 4572 MarkVTableUsed(CurrentLocation, ClassDecl); 4573} 4574 4575/// \brief Builds a statement that copies the given entity from \p From to 4576/// \c To. 4577/// 4578/// This routine is used to copy the members of a class with an 4579/// implicitly-declared copy assignment operator. When the entities being 4580/// copied are arrays, this routine builds for loops to copy them. 4581/// 4582/// \param S The Sema object used for type-checking. 4583/// 4584/// \param Loc The location where the implicit copy is being generated. 4585/// 4586/// \param T The type of the expressions being copied. Both expressions must 4587/// have this type. 4588/// 4589/// \param To The expression we are copying to. 4590/// 4591/// \param From The expression we are copying from. 4592/// 4593/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4594/// Otherwise, it's a non-static member subobject. 4595/// 4596/// \param Depth Internal parameter recording the depth of the recursion. 4597/// 4598/// \returns A statement or a loop that copies the expressions. 4599static StmtResult 4600BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4601 Expr *To, Expr *From, 4602 bool CopyingBaseSubobject, unsigned Depth = 0) { 4603 // C++0x [class.copy]p30: 4604 // Each subobject is assigned in the manner appropriate to its type: 4605 // 4606 // - if the subobject is of class type, the copy assignment operator 4607 // for the class is used (as if by explicit qualification; that is, 4608 // ignoring any possible virtual overriding functions in more derived 4609 // classes); 4610 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4611 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4612 4613 // Look for operator=. 4614 DeclarationName Name 4615 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4616 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4617 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4618 4619 // Filter out any result that isn't a copy-assignment operator. 4620 LookupResult::Filter F = OpLookup.makeFilter(); 4621 while (F.hasNext()) { 4622 NamedDecl *D = F.next(); 4623 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4624 if (Method->isCopyAssignmentOperator()) 4625 continue; 4626 4627 F.erase(); 4628 } 4629 F.done(); 4630 4631 // Suppress the protected check (C++ [class.protected]) for each of the 4632 // assignment operators we found. This strange dance is required when 4633 // we're assigning via a base classes's copy-assignment operator. To 4634 // ensure that we're getting the right base class subobject (without 4635 // ambiguities), we need to cast "this" to that subobject type; to 4636 // ensure that we don't go through the virtual call mechanism, we need 4637 // to qualify the operator= name with the base class (see below). However, 4638 // this means that if the base class has a protected copy assignment 4639 // operator, the protected member access check will fail. So, we 4640 // rewrite "protected" access to "public" access in this case, since we 4641 // know by construction that we're calling from a derived class. 4642 if (CopyingBaseSubobject) { 4643 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4644 L != LEnd; ++L) { 4645 if (L.getAccess() == AS_protected) 4646 L.setAccess(AS_public); 4647 } 4648 } 4649 4650 // Create the nested-name-specifier that will be used to qualify the 4651 // reference to operator=; this is required to suppress the virtual 4652 // call mechanism. 4653 CXXScopeSpec SS; 4654 SS.setRange(Loc); 4655 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4656 T.getTypePtr())); 4657 4658 // Create the reference to operator=. 4659 ExprResult OpEqualRef 4660 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4661 /*FirstQualifierInScope=*/0, OpLookup, 4662 /*TemplateArgs=*/0, 4663 /*SuppressQualifierCheck=*/true); 4664 if (OpEqualRef.isInvalid()) 4665 return StmtError(); 4666 4667 // Build the call to the assignment operator. 4668 4669 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4670 OpEqualRef.takeAs<Expr>(), 4671 Loc, &From, 1, Loc); 4672 if (Call.isInvalid()) 4673 return StmtError(); 4674 4675 return S.Owned(Call.takeAs<Stmt>()); 4676 } 4677 4678 // - if the subobject is of scalar type, the built-in assignment 4679 // operator is used. 4680 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4681 if (!ArrayTy) { 4682 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4683 if (Assignment.isInvalid()) 4684 return StmtError(); 4685 4686 return S.Owned(Assignment.takeAs<Stmt>()); 4687 } 4688 4689 // - if the subobject is an array, each element is assigned, in the 4690 // manner appropriate to the element type; 4691 4692 // Construct a loop over the array bounds, e.g., 4693 // 4694 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4695 // 4696 // that will copy each of the array elements. 4697 QualType SizeType = S.Context.getSizeType(); 4698 4699 // Create the iteration variable. 4700 IdentifierInfo *IterationVarName = 0; 4701 { 4702 llvm::SmallString<8> Str; 4703 llvm::raw_svector_ostream OS(Str); 4704 OS << "__i" << Depth; 4705 IterationVarName = &S.Context.Idents.get(OS.str()); 4706 } 4707 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4708 IterationVarName, SizeType, 4709 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4710 SC_None, SC_None); 4711 4712 // Initialize the iteration variable to zero. 4713 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4714 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4715 4716 // Create a reference to the iteration variable; we'll use this several 4717 // times throughout. 4718 Expr *IterationVarRef 4719 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4720 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4721 4722 // Create the DeclStmt that holds the iteration variable. 4723 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4724 4725 // Create the comparison against the array bound. 4726 llvm::APInt Upper = ArrayTy->getSize(); 4727 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4728 Expr *Comparison 4729 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4730 IntegerLiteral::Create(S.Context, 4731 Upper, SizeType, Loc), 4732 BO_NE, S.Context.BoolTy, Loc); 4733 4734 // Create the pre-increment of the iteration variable. 4735 Expr *Increment 4736 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4737 UO_PreInc, 4738 SizeType, Loc); 4739 4740 // Subscript the "from" and "to" expressions with the iteration variable. 4741 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4742 IterationVarRef, Loc)); 4743 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4744 IterationVarRef, Loc)); 4745 4746 // Build the copy for an individual element of the array. 4747 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4748 ArrayTy->getElementType(), 4749 To, From, 4750 CopyingBaseSubobject, Depth+1); 4751 if (Copy.isInvalid()) 4752 return StmtError(); 4753 4754 // Construct the loop that copies all elements of this array. 4755 return S.ActOnForStmt(Loc, Loc, InitStmt, 4756 S.MakeFullExpr(Comparison), 4757 0, S.MakeFullExpr(Increment), 4758 Loc, Copy.take()); 4759} 4760 4761/// \brief Determine whether the given class has a copy assignment operator 4762/// that accepts a const-qualified argument. 4763static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4764 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4765 4766 if (!Class->hasDeclaredCopyAssignment()) 4767 S.DeclareImplicitCopyAssignment(Class); 4768 4769 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4770 DeclarationName OpName 4771 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4772 4773 DeclContext::lookup_const_iterator Op, OpEnd; 4774 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4775 // C++ [class.copy]p9: 4776 // A user-declared copy assignment operator is a non-static non-template 4777 // member function of class X with exactly one parameter of type X, X&, 4778 // const X&, volatile X& or const volatile X&. 4779 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4780 if (!Method) 4781 continue; 4782 4783 if (Method->isStatic()) 4784 continue; 4785 if (Method->getPrimaryTemplate()) 4786 continue; 4787 const FunctionProtoType *FnType = 4788 Method->getType()->getAs<FunctionProtoType>(); 4789 assert(FnType && "Overloaded operator has no prototype."); 4790 // Don't assert on this; an invalid decl might have been left in the AST. 4791 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4792 continue; 4793 bool AcceptsConst = true; 4794 QualType ArgType = FnType->getArgType(0); 4795 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4796 ArgType = Ref->getPointeeType(); 4797 // Is it a non-const lvalue reference? 4798 if (!ArgType.isConstQualified()) 4799 AcceptsConst = false; 4800 } 4801 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4802 continue; 4803 4804 // We have a single argument of type cv X or cv X&, i.e. we've found the 4805 // copy assignment operator. Return whether it accepts const arguments. 4806 return AcceptsConst; 4807 } 4808 assert(Class->isInvalidDecl() && 4809 "No copy assignment operator declared in valid code."); 4810 return false; 4811} 4812 4813CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4814 // Note: The following rules are largely analoguous to the copy 4815 // constructor rules. Note that virtual bases are not taken into account 4816 // for determining the argument type of the operator. Note also that 4817 // operators taking an object instead of a reference are allowed. 4818 4819 4820 // C++ [class.copy]p10: 4821 // If the class definition does not explicitly declare a copy 4822 // assignment operator, one is declared implicitly. 4823 // The implicitly-defined copy assignment operator for a class X 4824 // will have the form 4825 // 4826 // X& X::operator=(const X&) 4827 // 4828 // if 4829 bool HasConstCopyAssignment = true; 4830 4831 // -- each direct base class B of X has a copy assignment operator 4832 // whose parameter is of type const B&, const volatile B& or B, 4833 // and 4834 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4835 BaseEnd = ClassDecl->bases_end(); 4836 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4837 assert(!Base->getType()->isDependentType() && 4838 "Cannot generate implicit members for class with dependent bases."); 4839 const CXXRecordDecl *BaseClassDecl 4840 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4841 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4842 } 4843 4844 // -- for all the nonstatic data members of X that are of a class 4845 // type M (or array thereof), each such class type has a copy 4846 // assignment operator whose parameter is of type const M&, 4847 // const volatile M& or M. 4848 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4849 FieldEnd = ClassDecl->field_end(); 4850 HasConstCopyAssignment && Field != FieldEnd; 4851 ++Field) { 4852 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4853 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4854 const CXXRecordDecl *FieldClassDecl 4855 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4856 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4857 } 4858 } 4859 4860 // Otherwise, the implicitly declared copy assignment operator will 4861 // have the form 4862 // 4863 // X& X::operator=(X&) 4864 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4865 QualType RetType = Context.getLValueReferenceType(ArgType); 4866 if (HasConstCopyAssignment) 4867 ArgType = ArgType.withConst(); 4868 ArgType = Context.getLValueReferenceType(ArgType); 4869 4870 // C++ [except.spec]p14: 4871 // An implicitly declared special member function (Clause 12) shall have an 4872 // exception-specification. [...] 4873 ImplicitExceptionSpecification ExceptSpec(Context); 4874 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4875 BaseEnd = ClassDecl->bases_end(); 4876 Base != BaseEnd; ++Base) { 4877 CXXRecordDecl *BaseClassDecl 4878 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4879 4880 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4881 DeclareImplicitCopyAssignment(BaseClassDecl); 4882 4883 if (CXXMethodDecl *CopyAssign 4884 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4885 ExceptSpec.CalledDecl(CopyAssign); 4886 } 4887 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4888 FieldEnd = ClassDecl->field_end(); 4889 Field != FieldEnd; 4890 ++Field) { 4891 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4892 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4893 CXXRecordDecl *FieldClassDecl 4894 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4895 4896 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4897 DeclareImplicitCopyAssignment(FieldClassDecl); 4898 4899 if (CXXMethodDecl *CopyAssign 4900 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4901 ExceptSpec.CalledDecl(CopyAssign); 4902 } 4903 } 4904 4905 // An implicitly-declared copy assignment operator is an inline public 4906 // member of its class. 4907 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4908 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4909 CXXMethodDecl *CopyAssignment 4910 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4911 Context.getFunctionType(RetType, &ArgType, 1, 4912 false, 0, 4913 ExceptSpec.hasExceptionSpecification(), 4914 ExceptSpec.hasAnyExceptionSpecification(), 4915 ExceptSpec.size(), 4916 ExceptSpec.data(), 4917 FunctionType::ExtInfo()), 4918 /*TInfo=*/0, /*isStatic=*/false, 4919 /*StorageClassAsWritten=*/SC_None, 4920 /*isInline=*/true); 4921 CopyAssignment->setAccess(AS_public); 4922 CopyAssignment->setImplicit(); 4923 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4924 4925 // Add the parameter to the operator. 4926 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4927 ClassDecl->getLocation(), 4928 /*Id=*/0, 4929 ArgType, /*TInfo=*/0, 4930 SC_None, 4931 SC_None, 0); 4932 CopyAssignment->setParams(&FromParam, 1); 4933 4934 // Note that we have added this copy-assignment operator. 4935 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4936 4937 if (Scope *S = getScopeForContext(ClassDecl)) 4938 PushOnScopeChains(CopyAssignment, S, false); 4939 ClassDecl->addDecl(CopyAssignment); 4940 4941 AddOverriddenMethods(ClassDecl, CopyAssignment); 4942 return CopyAssignment; 4943} 4944 4945void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4946 CXXMethodDecl *CopyAssignOperator) { 4947 assert((CopyAssignOperator->isImplicit() && 4948 CopyAssignOperator->isOverloadedOperator() && 4949 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4950 !CopyAssignOperator->isUsed(false)) && 4951 "DefineImplicitCopyAssignment called for wrong function"); 4952 4953 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4954 4955 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4956 CopyAssignOperator->setInvalidDecl(); 4957 return; 4958 } 4959 4960 CopyAssignOperator->setUsed(); 4961 4962 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4963 ErrorTrap Trap(*this); 4964 4965 // C++0x [class.copy]p30: 4966 // The implicitly-defined or explicitly-defaulted copy assignment operator 4967 // for a non-union class X performs memberwise copy assignment of its 4968 // subobjects. The direct base classes of X are assigned first, in the 4969 // order of their declaration in the base-specifier-list, and then the 4970 // immediate non-static data members of X are assigned, in the order in 4971 // which they were declared in the class definition. 4972 4973 // The statements that form the synthesized function body. 4974 ASTOwningVector<Stmt*> Statements(*this); 4975 4976 // The parameter for the "other" object, which we are copying from. 4977 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4978 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4979 QualType OtherRefType = Other->getType(); 4980 if (const LValueReferenceType *OtherRef 4981 = OtherRefType->getAs<LValueReferenceType>()) { 4982 OtherRefType = OtherRef->getPointeeType(); 4983 OtherQuals = OtherRefType.getQualifiers(); 4984 } 4985 4986 // Our location for everything implicitly-generated. 4987 SourceLocation Loc = CopyAssignOperator->getLocation(); 4988 4989 // Construct a reference to the "other" object. We'll be using this 4990 // throughout the generated ASTs. 4991 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4992 assert(OtherRef && "Reference to parameter cannot fail!"); 4993 4994 // Construct the "this" pointer. We'll be using this throughout the generated 4995 // ASTs. 4996 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4997 assert(This && "Reference to this cannot fail!"); 4998 4999 // Assign base classes. 5000 bool Invalid = false; 5001 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5002 E = ClassDecl->bases_end(); Base != E; ++Base) { 5003 // Form the assignment: 5004 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5005 QualType BaseType = Base->getType().getUnqualifiedType(); 5006 CXXRecordDecl *BaseClassDecl = 0; 5007 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 5008 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 5009 else { 5010 Invalid = true; 5011 continue; 5012 } 5013 5014 CXXCastPath BasePath; 5015 BasePath.push_back(Base); 5016 5017 // Construct the "from" expression, which is an implicit cast to the 5018 // appropriately-qualified base type. 5019 Expr *From = OtherRef->Retain(); 5020 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5021 CK_UncheckedDerivedToBase, 5022 VK_LValue, &BasePath); 5023 5024 // Dereference "this". 5025 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5026 5027 // Implicitly cast "this" to the appropriately-qualified base type. 5028 Expr *ToE = To.takeAs<Expr>(); 5029 ImpCastExprToType(ToE, 5030 Context.getCVRQualifiedType(BaseType, 5031 CopyAssignOperator->getTypeQualifiers()), 5032 CK_UncheckedDerivedToBase, 5033 VK_LValue, &BasePath); 5034 To = Owned(ToE); 5035 5036 // Build the copy. 5037 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5038 To.get(), From, 5039 /*CopyingBaseSubobject=*/true); 5040 if (Copy.isInvalid()) { 5041 Diag(CurrentLocation, diag::note_member_synthesized_at) 5042 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5043 CopyAssignOperator->setInvalidDecl(); 5044 return; 5045 } 5046 5047 // Success! Record the copy. 5048 Statements.push_back(Copy.takeAs<Expr>()); 5049 } 5050 5051 // \brief Reference to the __builtin_memcpy function. 5052 Expr *BuiltinMemCpyRef = 0; 5053 // \brief Reference to the __builtin_objc_memmove_collectable function. 5054 Expr *CollectableMemCpyRef = 0; 5055 5056 // Assign non-static members. 5057 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5058 FieldEnd = ClassDecl->field_end(); 5059 Field != FieldEnd; ++Field) { 5060 // Check for members of reference type; we can't copy those. 5061 if (Field->getType()->isReferenceType()) { 5062 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5063 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5064 Diag(Field->getLocation(), diag::note_declared_at); 5065 Diag(CurrentLocation, diag::note_member_synthesized_at) 5066 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5067 Invalid = true; 5068 continue; 5069 } 5070 5071 // Check for members of const-qualified, non-class type. 5072 QualType BaseType = Context.getBaseElementType(Field->getType()); 5073 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5074 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5075 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5076 Diag(Field->getLocation(), diag::note_declared_at); 5077 Diag(CurrentLocation, diag::note_member_synthesized_at) 5078 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5079 Invalid = true; 5080 continue; 5081 } 5082 5083 QualType FieldType = Field->getType().getNonReferenceType(); 5084 if (FieldType->isIncompleteArrayType()) { 5085 assert(ClassDecl->hasFlexibleArrayMember() && 5086 "Incomplete array type is not valid"); 5087 continue; 5088 } 5089 5090 // Build references to the field in the object we're copying from and to. 5091 CXXScopeSpec SS; // Intentionally empty 5092 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5093 LookupMemberName); 5094 MemberLookup.addDecl(*Field); 5095 MemberLookup.resolveKind(); 5096 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5097 Loc, /*IsArrow=*/false, 5098 SS, 0, MemberLookup, 0); 5099 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5100 Loc, /*IsArrow=*/true, 5101 SS, 0, MemberLookup, 0); 5102 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5103 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5104 5105 // If the field should be copied with __builtin_memcpy rather than via 5106 // explicit assignments, do so. This optimization only applies for arrays 5107 // of scalars and arrays of class type with trivial copy-assignment 5108 // operators. 5109 if (FieldType->isArrayType() && 5110 (!BaseType->isRecordType() || 5111 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5112 ->hasTrivialCopyAssignment())) { 5113 // Compute the size of the memory buffer to be copied. 5114 QualType SizeType = Context.getSizeType(); 5115 llvm::APInt Size(Context.getTypeSize(SizeType), 5116 Context.getTypeSizeInChars(BaseType).getQuantity()); 5117 for (const ConstantArrayType *Array 5118 = Context.getAsConstantArrayType(FieldType); 5119 Array; 5120 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5121 llvm::APInt ArraySize = Array->getSize(); 5122 ArraySize.zextOrTrunc(Size.getBitWidth()); 5123 Size *= ArraySize; 5124 } 5125 5126 // Take the address of the field references for "from" and "to". 5127 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5128 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5129 5130 bool NeedsCollectableMemCpy = 5131 (BaseType->isRecordType() && 5132 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5133 5134 if (NeedsCollectableMemCpy) { 5135 if (!CollectableMemCpyRef) { 5136 // Create a reference to the __builtin_objc_memmove_collectable function. 5137 LookupResult R(*this, 5138 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5139 Loc, LookupOrdinaryName); 5140 LookupName(R, TUScope, true); 5141 5142 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5143 if (!CollectableMemCpy) { 5144 // Something went horribly wrong earlier, and we will have 5145 // complained about it. 5146 Invalid = true; 5147 continue; 5148 } 5149 5150 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5151 CollectableMemCpy->getType(), 5152 Loc, 0).takeAs<Expr>(); 5153 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5154 } 5155 } 5156 // Create a reference to the __builtin_memcpy builtin function. 5157 else if (!BuiltinMemCpyRef) { 5158 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5159 LookupOrdinaryName); 5160 LookupName(R, TUScope, true); 5161 5162 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5163 if (!BuiltinMemCpy) { 5164 // Something went horribly wrong earlier, and we will have complained 5165 // about it. 5166 Invalid = true; 5167 continue; 5168 } 5169 5170 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5171 BuiltinMemCpy->getType(), 5172 Loc, 0).takeAs<Expr>(); 5173 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5174 } 5175 5176 ASTOwningVector<Expr*> CallArgs(*this); 5177 CallArgs.push_back(To.takeAs<Expr>()); 5178 CallArgs.push_back(From.takeAs<Expr>()); 5179 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5180 ExprResult Call = ExprError(); 5181 if (NeedsCollectableMemCpy) 5182 Call = ActOnCallExpr(/*Scope=*/0, 5183 CollectableMemCpyRef, 5184 Loc, move_arg(CallArgs), 5185 Loc); 5186 else 5187 Call = ActOnCallExpr(/*Scope=*/0, 5188 BuiltinMemCpyRef, 5189 Loc, move_arg(CallArgs), 5190 Loc); 5191 5192 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5193 Statements.push_back(Call.takeAs<Expr>()); 5194 continue; 5195 } 5196 5197 // Build the copy of this field. 5198 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5199 To.get(), From.get(), 5200 /*CopyingBaseSubobject=*/false); 5201 if (Copy.isInvalid()) { 5202 Diag(CurrentLocation, diag::note_member_synthesized_at) 5203 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5204 CopyAssignOperator->setInvalidDecl(); 5205 return; 5206 } 5207 5208 // Success! Record the copy. 5209 Statements.push_back(Copy.takeAs<Stmt>()); 5210 } 5211 5212 if (!Invalid) { 5213 // Add a "return *this;" 5214 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5215 5216 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5217 if (Return.isInvalid()) 5218 Invalid = true; 5219 else { 5220 Statements.push_back(Return.takeAs<Stmt>()); 5221 5222 if (Trap.hasErrorOccurred()) { 5223 Diag(CurrentLocation, diag::note_member_synthesized_at) 5224 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5225 Invalid = true; 5226 } 5227 } 5228 } 5229 5230 if (Invalid) { 5231 CopyAssignOperator->setInvalidDecl(); 5232 return; 5233 } 5234 5235 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5236 /*isStmtExpr=*/false); 5237 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5238 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5239} 5240 5241CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5242 CXXRecordDecl *ClassDecl) { 5243 // C++ [class.copy]p4: 5244 // If the class definition does not explicitly declare a copy 5245 // constructor, one is declared implicitly. 5246 5247 // C++ [class.copy]p5: 5248 // The implicitly-declared copy constructor for a class X will 5249 // have the form 5250 // 5251 // X::X(const X&) 5252 // 5253 // if 5254 bool HasConstCopyConstructor = true; 5255 5256 // -- each direct or virtual base class B of X has a copy 5257 // constructor whose first parameter is of type const B& or 5258 // const volatile B&, and 5259 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5260 BaseEnd = ClassDecl->bases_end(); 5261 HasConstCopyConstructor && Base != BaseEnd; 5262 ++Base) { 5263 // Virtual bases are handled below. 5264 if (Base->isVirtual()) 5265 continue; 5266 5267 CXXRecordDecl *BaseClassDecl 5268 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5269 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5270 DeclareImplicitCopyConstructor(BaseClassDecl); 5271 5272 HasConstCopyConstructor 5273 = BaseClassDecl->hasConstCopyConstructor(Context); 5274 } 5275 5276 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5277 BaseEnd = ClassDecl->vbases_end(); 5278 HasConstCopyConstructor && Base != BaseEnd; 5279 ++Base) { 5280 CXXRecordDecl *BaseClassDecl 5281 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5282 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5283 DeclareImplicitCopyConstructor(BaseClassDecl); 5284 5285 HasConstCopyConstructor 5286 = BaseClassDecl->hasConstCopyConstructor(Context); 5287 } 5288 5289 // -- for all the nonstatic data members of X that are of a 5290 // class type M (or array thereof), each such class type 5291 // has a copy constructor whose first parameter is of type 5292 // const M& or const volatile M&. 5293 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5294 FieldEnd = ClassDecl->field_end(); 5295 HasConstCopyConstructor && Field != FieldEnd; 5296 ++Field) { 5297 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5298 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5299 CXXRecordDecl *FieldClassDecl 5300 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5301 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5302 DeclareImplicitCopyConstructor(FieldClassDecl); 5303 5304 HasConstCopyConstructor 5305 = FieldClassDecl->hasConstCopyConstructor(Context); 5306 } 5307 } 5308 5309 // Otherwise, the implicitly declared copy constructor will have 5310 // the form 5311 // 5312 // X::X(X&) 5313 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5314 QualType ArgType = ClassType; 5315 if (HasConstCopyConstructor) 5316 ArgType = ArgType.withConst(); 5317 ArgType = Context.getLValueReferenceType(ArgType); 5318 5319 // C++ [except.spec]p14: 5320 // An implicitly declared special member function (Clause 12) shall have an 5321 // exception-specification. [...] 5322 ImplicitExceptionSpecification ExceptSpec(Context); 5323 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5324 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5325 BaseEnd = ClassDecl->bases_end(); 5326 Base != BaseEnd; 5327 ++Base) { 5328 // Virtual bases are handled below. 5329 if (Base->isVirtual()) 5330 continue; 5331 5332 CXXRecordDecl *BaseClassDecl 5333 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5334 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5335 DeclareImplicitCopyConstructor(BaseClassDecl); 5336 5337 if (CXXConstructorDecl *CopyConstructor 5338 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5339 ExceptSpec.CalledDecl(CopyConstructor); 5340 } 5341 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5342 BaseEnd = ClassDecl->vbases_end(); 5343 Base != BaseEnd; 5344 ++Base) { 5345 CXXRecordDecl *BaseClassDecl 5346 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5347 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5348 DeclareImplicitCopyConstructor(BaseClassDecl); 5349 5350 if (CXXConstructorDecl *CopyConstructor 5351 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5352 ExceptSpec.CalledDecl(CopyConstructor); 5353 } 5354 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5355 FieldEnd = ClassDecl->field_end(); 5356 Field != FieldEnd; 5357 ++Field) { 5358 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5359 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5360 CXXRecordDecl *FieldClassDecl 5361 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5362 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5363 DeclareImplicitCopyConstructor(FieldClassDecl); 5364 5365 if (CXXConstructorDecl *CopyConstructor 5366 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5367 ExceptSpec.CalledDecl(CopyConstructor); 5368 } 5369 } 5370 5371 // An implicitly-declared copy constructor is an inline public 5372 // member of its class. 5373 DeclarationName Name 5374 = Context.DeclarationNames.getCXXConstructorName( 5375 Context.getCanonicalType(ClassType)); 5376 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5377 CXXConstructorDecl *CopyConstructor 5378 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5379 Context.getFunctionType(Context.VoidTy, 5380 &ArgType, 1, 5381 false, 0, 5382 ExceptSpec.hasExceptionSpecification(), 5383 ExceptSpec.hasAnyExceptionSpecification(), 5384 ExceptSpec.size(), 5385 ExceptSpec.data(), 5386 FunctionType::ExtInfo()), 5387 /*TInfo=*/0, 5388 /*isExplicit=*/false, 5389 /*isInline=*/true, 5390 /*isImplicitlyDeclared=*/true); 5391 CopyConstructor->setAccess(AS_public); 5392 CopyConstructor->setImplicit(); 5393 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5394 5395 // Note that we have declared this constructor. 5396 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5397 5398 // Add the parameter to the constructor. 5399 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5400 ClassDecl->getLocation(), 5401 /*IdentifierInfo=*/0, 5402 ArgType, /*TInfo=*/0, 5403 SC_None, 5404 SC_None, 0); 5405 CopyConstructor->setParams(&FromParam, 1); 5406 if (Scope *S = getScopeForContext(ClassDecl)) 5407 PushOnScopeChains(CopyConstructor, S, false); 5408 ClassDecl->addDecl(CopyConstructor); 5409 5410 return CopyConstructor; 5411} 5412 5413void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5414 CXXConstructorDecl *CopyConstructor, 5415 unsigned TypeQuals) { 5416 assert((CopyConstructor->isImplicit() && 5417 CopyConstructor->isCopyConstructor(TypeQuals) && 5418 !CopyConstructor->isUsed(false)) && 5419 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5420 5421 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5422 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5423 5424 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5425 ErrorTrap Trap(*this); 5426 5427 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5428 Trap.hasErrorOccurred()) { 5429 Diag(CurrentLocation, diag::note_member_synthesized_at) 5430 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5431 CopyConstructor->setInvalidDecl(); 5432 } else { 5433 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5434 CopyConstructor->getLocation(), 5435 MultiStmtArg(*this, 0, 0), 5436 /*isStmtExpr=*/false) 5437 .takeAs<Stmt>()); 5438 } 5439 5440 CopyConstructor->setUsed(); 5441} 5442 5443ExprResult 5444Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5445 CXXConstructorDecl *Constructor, 5446 MultiExprArg ExprArgs, 5447 bool RequiresZeroInit, 5448 unsigned ConstructKind) { 5449 bool Elidable = false; 5450 5451 // C++0x [class.copy]p34: 5452 // When certain criteria are met, an implementation is allowed to 5453 // omit the copy/move construction of a class object, even if the 5454 // copy/move constructor and/or destructor for the object have 5455 // side effects. [...] 5456 // - when a temporary class object that has not been bound to a 5457 // reference (12.2) would be copied/moved to a class object 5458 // with the same cv-unqualified type, the copy/move operation 5459 // can be omitted by constructing the temporary object 5460 // directly into the target of the omitted copy/move 5461 if (ConstructKind == CXXConstructExpr::CK_Complete && 5462 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5463 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5464 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5465 } 5466 5467 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5468 Elidable, move(ExprArgs), RequiresZeroInit, 5469 ConstructKind); 5470} 5471 5472/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5473/// including handling of its default argument expressions. 5474ExprResult 5475Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5476 CXXConstructorDecl *Constructor, bool Elidable, 5477 MultiExprArg ExprArgs, 5478 bool RequiresZeroInit, 5479 unsigned ConstructKind) { 5480 unsigned NumExprs = ExprArgs.size(); 5481 Expr **Exprs = (Expr **)ExprArgs.release(); 5482 5483 MarkDeclarationReferenced(ConstructLoc, Constructor); 5484 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5485 Constructor, Elidable, Exprs, NumExprs, 5486 RequiresZeroInit, 5487 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5488} 5489 5490bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5491 CXXConstructorDecl *Constructor, 5492 MultiExprArg Exprs) { 5493 ExprResult TempResult = 5494 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5495 move(Exprs), false, CXXConstructExpr::CK_Complete); 5496 if (TempResult.isInvalid()) 5497 return true; 5498 5499 Expr *Temp = TempResult.takeAs<Expr>(); 5500 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5501 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5502 VD->setInit(Temp); 5503 5504 return false; 5505} 5506 5507void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5508 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5509 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5510 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5511 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5512 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5513 CheckDestructorAccess(VD->getLocation(), Destructor, 5514 PDiag(diag::err_access_dtor_var) 5515 << VD->getDeclName() 5516 << VD->getType()); 5517 5518 // TODO: this should be re-enabled for static locals by !CXAAtExit 5519 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5520 Diag(VD->getLocation(), diag::warn_global_destructor); 5521 } 5522} 5523 5524/// AddCXXDirectInitializerToDecl - This action is called immediately after 5525/// ActOnDeclarator, when a C++ direct initializer is present. 5526/// e.g: "int x(1);" 5527void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5528 SourceLocation LParenLoc, 5529 MultiExprArg Exprs, 5530 SourceLocation RParenLoc) { 5531 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5532 5533 // If there is no declaration, there was an error parsing it. Just ignore 5534 // the initializer. 5535 if (RealDecl == 0) 5536 return; 5537 5538 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5539 if (!VDecl) { 5540 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5541 RealDecl->setInvalidDecl(); 5542 return; 5543 } 5544 5545 // We will represent direct-initialization similarly to copy-initialization: 5546 // int x(1); -as-> int x = 1; 5547 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5548 // 5549 // Clients that want to distinguish between the two forms, can check for 5550 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5551 // A major benefit is that clients that don't particularly care about which 5552 // exactly form was it (like the CodeGen) can handle both cases without 5553 // special case code. 5554 5555 // C++ 8.5p11: 5556 // The form of initialization (using parentheses or '=') is generally 5557 // insignificant, but does matter when the entity being initialized has a 5558 // class type. 5559 5560 if (!VDecl->getType()->isDependentType() && 5561 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5562 diag::err_typecheck_decl_incomplete_type)) { 5563 VDecl->setInvalidDecl(); 5564 return; 5565 } 5566 5567 // The variable can not have an abstract class type. 5568 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5569 diag::err_abstract_type_in_decl, 5570 AbstractVariableType)) 5571 VDecl->setInvalidDecl(); 5572 5573 const VarDecl *Def; 5574 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5575 Diag(VDecl->getLocation(), diag::err_redefinition) 5576 << VDecl->getDeclName(); 5577 Diag(Def->getLocation(), diag::note_previous_definition); 5578 VDecl->setInvalidDecl(); 5579 return; 5580 } 5581 5582 // C++ [class.static.data]p4 5583 // If a static data member is of const integral or const 5584 // enumeration type, its declaration in the class definition can 5585 // specify a constant-initializer which shall be an integral 5586 // constant expression (5.19). In that case, the member can appear 5587 // in integral constant expressions. The member shall still be 5588 // defined in a namespace scope if it is used in the program and the 5589 // namespace scope definition shall not contain an initializer. 5590 // 5591 // We already performed a redefinition check above, but for static 5592 // data members we also need to check whether there was an in-class 5593 // declaration with an initializer. 5594 const VarDecl* PrevInit = 0; 5595 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5596 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5597 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5598 return; 5599 } 5600 5601 // If either the declaration has a dependent type or if any of the 5602 // expressions is type-dependent, we represent the initialization 5603 // via a ParenListExpr for later use during template instantiation. 5604 if (VDecl->getType()->isDependentType() || 5605 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5606 // Let clients know that initialization was done with a direct initializer. 5607 VDecl->setCXXDirectInitializer(true); 5608 5609 // Store the initialization expressions as a ParenListExpr. 5610 unsigned NumExprs = Exprs.size(); 5611 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5612 (Expr **)Exprs.release(), 5613 NumExprs, RParenLoc)); 5614 return; 5615 } 5616 5617 // Capture the variable that is being initialized and the style of 5618 // initialization. 5619 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5620 5621 // FIXME: Poor source location information. 5622 InitializationKind Kind 5623 = InitializationKind::CreateDirect(VDecl->getLocation(), 5624 LParenLoc, RParenLoc); 5625 5626 InitializationSequence InitSeq(*this, Entity, Kind, 5627 Exprs.get(), Exprs.size()); 5628 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5629 if (Result.isInvalid()) { 5630 VDecl->setInvalidDecl(); 5631 return; 5632 } 5633 5634 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5635 VDecl->setInit(Result.takeAs<Expr>()); 5636 VDecl->setCXXDirectInitializer(true); 5637 5638 if (!VDecl->isInvalidDecl() && 5639 !VDecl->getDeclContext()->isDependentContext() && 5640 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5641 !VDecl->getInit()->isConstantInitializer(Context, 5642 VDecl->getType()->isReferenceType())) 5643 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5644 << VDecl->getInit()->getSourceRange(); 5645 5646 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5647 FinalizeVarWithDestructor(VDecl, Record); 5648} 5649 5650/// \brief Given a constructor and the set of arguments provided for the 5651/// constructor, convert the arguments and add any required default arguments 5652/// to form a proper call to this constructor. 5653/// 5654/// \returns true if an error occurred, false otherwise. 5655bool 5656Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5657 MultiExprArg ArgsPtr, 5658 SourceLocation Loc, 5659 ASTOwningVector<Expr*> &ConvertedArgs) { 5660 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5661 unsigned NumArgs = ArgsPtr.size(); 5662 Expr **Args = (Expr **)ArgsPtr.get(); 5663 5664 const FunctionProtoType *Proto 5665 = Constructor->getType()->getAs<FunctionProtoType>(); 5666 assert(Proto && "Constructor without a prototype?"); 5667 unsigned NumArgsInProto = Proto->getNumArgs(); 5668 5669 // If too few arguments are available, we'll fill in the rest with defaults. 5670 if (NumArgs < NumArgsInProto) 5671 ConvertedArgs.reserve(NumArgsInProto); 5672 else 5673 ConvertedArgs.reserve(NumArgs); 5674 5675 VariadicCallType CallType = 5676 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5677 llvm::SmallVector<Expr *, 8> AllArgs; 5678 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5679 Proto, 0, Args, NumArgs, AllArgs, 5680 CallType); 5681 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5682 ConvertedArgs.push_back(AllArgs[i]); 5683 return Invalid; 5684} 5685 5686static inline bool 5687CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5688 const FunctionDecl *FnDecl) { 5689 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5690 if (isa<NamespaceDecl>(DC)) { 5691 return SemaRef.Diag(FnDecl->getLocation(), 5692 diag::err_operator_new_delete_declared_in_namespace) 5693 << FnDecl->getDeclName(); 5694 } 5695 5696 if (isa<TranslationUnitDecl>(DC) && 5697 FnDecl->getStorageClass() == SC_Static) { 5698 return SemaRef.Diag(FnDecl->getLocation(), 5699 diag::err_operator_new_delete_declared_static) 5700 << FnDecl->getDeclName(); 5701 } 5702 5703 return false; 5704} 5705 5706static inline bool 5707CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5708 CanQualType ExpectedResultType, 5709 CanQualType ExpectedFirstParamType, 5710 unsigned DependentParamTypeDiag, 5711 unsigned InvalidParamTypeDiag) { 5712 QualType ResultType = 5713 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5714 5715 // Check that the result type is not dependent. 5716 if (ResultType->isDependentType()) 5717 return SemaRef.Diag(FnDecl->getLocation(), 5718 diag::err_operator_new_delete_dependent_result_type) 5719 << FnDecl->getDeclName() << ExpectedResultType; 5720 5721 // Check that the result type is what we expect. 5722 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5723 return SemaRef.Diag(FnDecl->getLocation(), 5724 diag::err_operator_new_delete_invalid_result_type) 5725 << FnDecl->getDeclName() << ExpectedResultType; 5726 5727 // A function template must have at least 2 parameters. 5728 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5729 return SemaRef.Diag(FnDecl->getLocation(), 5730 diag::err_operator_new_delete_template_too_few_parameters) 5731 << FnDecl->getDeclName(); 5732 5733 // The function decl must have at least 1 parameter. 5734 if (FnDecl->getNumParams() == 0) 5735 return SemaRef.Diag(FnDecl->getLocation(), 5736 diag::err_operator_new_delete_too_few_parameters) 5737 << FnDecl->getDeclName(); 5738 5739 // Check the the first parameter type is not dependent. 5740 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5741 if (FirstParamType->isDependentType()) 5742 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5743 << FnDecl->getDeclName() << ExpectedFirstParamType; 5744 5745 // Check that the first parameter type is what we expect. 5746 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5747 ExpectedFirstParamType) 5748 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5749 << FnDecl->getDeclName() << ExpectedFirstParamType; 5750 5751 return false; 5752} 5753 5754static bool 5755CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5756 // C++ [basic.stc.dynamic.allocation]p1: 5757 // A program is ill-formed if an allocation function is declared in a 5758 // namespace scope other than global scope or declared static in global 5759 // scope. 5760 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5761 return true; 5762 5763 CanQualType SizeTy = 5764 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5765 5766 // C++ [basic.stc.dynamic.allocation]p1: 5767 // The return type shall be void*. The first parameter shall have type 5768 // std::size_t. 5769 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5770 SizeTy, 5771 diag::err_operator_new_dependent_param_type, 5772 diag::err_operator_new_param_type)) 5773 return true; 5774 5775 // C++ [basic.stc.dynamic.allocation]p1: 5776 // The first parameter shall not have an associated default argument. 5777 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5778 return SemaRef.Diag(FnDecl->getLocation(), 5779 diag::err_operator_new_default_arg) 5780 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5781 5782 return false; 5783} 5784 5785static bool 5786CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5787 // C++ [basic.stc.dynamic.deallocation]p1: 5788 // A program is ill-formed if deallocation functions are declared in a 5789 // namespace scope other than global scope or declared static in global 5790 // scope. 5791 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5792 return true; 5793 5794 // C++ [basic.stc.dynamic.deallocation]p2: 5795 // Each deallocation function shall return void and its first parameter 5796 // shall be void*. 5797 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5798 SemaRef.Context.VoidPtrTy, 5799 diag::err_operator_delete_dependent_param_type, 5800 diag::err_operator_delete_param_type)) 5801 return true; 5802 5803 return false; 5804} 5805 5806/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5807/// of this overloaded operator is well-formed. If so, returns false; 5808/// otherwise, emits appropriate diagnostics and returns true. 5809bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5810 assert(FnDecl && FnDecl->isOverloadedOperator() && 5811 "Expected an overloaded operator declaration"); 5812 5813 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5814 5815 // C++ [over.oper]p5: 5816 // The allocation and deallocation functions, operator new, 5817 // operator new[], operator delete and operator delete[], are 5818 // described completely in 3.7.3. The attributes and restrictions 5819 // found in the rest of this subclause do not apply to them unless 5820 // explicitly stated in 3.7.3. 5821 if (Op == OO_Delete || Op == OO_Array_Delete) 5822 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5823 5824 if (Op == OO_New || Op == OO_Array_New) 5825 return CheckOperatorNewDeclaration(*this, FnDecl); 5826 5827 // C++ [over.oper]p6: 5828 // An operator function shall either be a non-static member 5829 // function or be a non-member function and have at least one 5830 // parameter whose type is a class, a reference to a class, an 5831 // enumeration, or a reference to an enumeration. 5832 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5833 if (MethodDecl->isStatic()) 5834 return Diag(FnDecl->getLocation(), 5835 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5836 } else { 5837 bool ClassOrEnumParam = false; 5838 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5839 ParamEnd = FnDecl->param_end(); 5840 Param != ParamEnd; ++Param) { 5841 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5842 if (ParamType->isDependentType() || ParamType->isRecordType() || 5843 ParamType->isEnumeralType()) { 5844 ClassOrEnumParam = true; 5845 break; 5846 } 5847 } 5848 5849 if (!ClassOrEnumParam) 5850 return Diag(FnDecl->getLocation(), 5851 diag::err_operator_overload_needs_class_or_enum) 5852 << FnDecl->getDeclName(); 5853 } 5854 5855 // C++ [over.oper]p8: 5856 // An operator function cannot have default arguments (8.3.6), 5857 // except where explicitly stated below. 5858 // 5859 // Only the function-call operator allows default arguments 5860 // (C++ [over.call]p1). 5861 if (Op != OO_Call) { 5862 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5863 Param != FnDecl->param_end(); ++Param) { 5864 if ((*Param)->hasDefaultArg()) 5865 return Diag((*Param)->getLocation(), 5866 diag::err_operator_overload_default_arg) 5867 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5868 } 5869 } 5870 5871 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5872 { false, false, false } 5873#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5874 , { Unary, Binary, MemberOnly } 5875#include "clang/Basic/OperatorKinds.def" 5876 }; 5877 5878 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5879 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5880 bool MustBeMemberOperator = OperatorUses[Op][2]; 5881 5882 // C++ [over.oper]p8: 5883 // [...] Operator functions cannot have more or fewer parameters 5884 // than the number required for the corresponding operator, as 5885 // described in the rest of this subclause. 5886 unsigned NumParams = FnDecl->getNumParams() 5887 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5888 if (Op != OO_Call && 5889 ((NumParams == 1 && !CanBeUnaryOperator) || 5890 (NumParams == 2 && !CanBeBinaryOperator) || 5891 (NumParams < 1) || (NumParams > 2))) { 5892 // We have the wrong number of parameters. 5893 unsigned ErrorKind; 5894 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5895 ErrorKind = 2; // 2 -> unary or binary. 5896 } else if (CanBeUnaryOperator) { 5897 ErrorKind = 0; // 0 -> unary 5898 } else { 5899 assert(CanBeBinaryOperator && 5900 "All non-call overloaded operators are unary or binary!"); 5901 ErrorKind = 1; // 1 -> binary 5902 } 5903 5904 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5905 << FnDecl->getDeclName() << NumParams << ErrorKind; 5906 } 5907 5908 // Overloaded operators other than operator() cannot be variadic. 5909 if (Op != OO_Call && 5910 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5911 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5912 << FnDecl->getDeclName(); 5913 } 5914 5915 // Some operators must be non-static member functions. 5916 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5917 return Diag(FnDecl->getLocation(), 5918 diag::err_operator_overload_must_be_member) 5919 << FnDecl->getDeclName(); 5920 } 5921 5922 // C++ [over.inc]p1: 5923 // The user-defined function called operator++ implements the 5924 // prefix and postfix ++ operator. If this function is a member 5925 // function with no parameters, or a non-member function with one 5926 // parameter of class or enumeration type, it defines the prefix 5927 // increment operator ++ for objects of that type. If the function 5928 // is a member function with one parameter (which shall be of type 5929 // int) or a non-member function with two parameters (the second 5930 // of which shall be of type int), it defines the postfix 5931 // increment operator ++ for objects of that type. 5932 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5933 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5934 bool ParamIsInt = false; 5935 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5936 ParamIsInt = BT->getKind() == BuiltinType::Int; 5937 5938 if (!ParamIsInt) 5939 return Diag(LastParam->getLocation(), 5940 diag::err_operator_overload_post_incdec_must_be_int) 5941 << LastParam->getType() << (Op == OO_MinusMinus); 5942 } 5943 5944 return false; 5945} 5946 5947/// CheckLiteralOperatorDeclaration - Check whether the declaration 5948/// of this literal operator function is well-formed. If so, returns 5949/// false; otherwise, emits appropriate diagnostics and returns true. 5950bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5951 DeclContext *DC = FnDecl->getDeclContext(); 5952 Decl::Kind Kind = DC->getDeclKind(); 5953 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5954 Kind != Decl::LinkageSpec) { 5955 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5956 << FnDecl->getDeclName(); 5957 return true; 5958 } 5959 5960 bool Valid = false; 5961 5962 // template <char...> type operator "" name() is the only valid template 5963 // signature, and the only valid signature with no parameters. 5964 if (FnDecl->param_size() == 0) { 5965 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5966 // Must have only one template parameter 5967 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5968 if (Params->size() == 1) { 5969 NonTypeTemplateParmDecl *PmDecl = 5970 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5971 5972 // The template parameter must be a char parameter pack. 5973 // FIXME: This test will always fail because non-type parameter packs 5974 // have not been implemented. 5975 if (PmDecl && PmDecl->isTemplateParameterPack() && 5976 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5977 Valid = true; 5978 } 5979 } 5980 } else { 5981 // Check the first parameter 5982 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5983 5984 QualType T = (*Param)->getType(); 5985 5986 // unsigned long long int, long double, and any character type are allowed 5987 // as the only parameters. 5988 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5989 Context.hasSameType(T, Context.LongDoubleTy) || 5990 Context.hasSameType(T, Context.CharTy) || 5991 Context.hasSameType(T, Context.WCharTy) || 5992 Context.hasSameType(T, Context.Char16Ty) || 5993 Context.hasSameType(T, Context.Char32Ty)) { 5994 if (++Param == FnDecl->param_end()) 5995 Valid = true; 5996 goto FinishedParams; 5997 } 5998 5999 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6000 const PointerType *PT = T->getAs<PointerType>(); 6001 if (!PT) 6002 goto FinishedParams; 6003 T = PT->getPointeeType(); 6004 if (!T.isConstQualified()) 6005 goto FinishedParams; 6006 T = T.getUnqualifiedType(); 6007 6008 // Move on to the second parameter; 6009 ++Param; 6010 6011 // If there is no second parameter, the first must be a const char * 6012 if (Param == FnDecl->param_end()) { 6013 if (Context.hasSameType(T, Context.CharTy)) 6014 Valid = true; 6015 goto FinishedParams; 6016 } 6017 6018 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6019 // are allowed as the first parameter to a two-parameter function 6020 if (!(Context.hasSameType(T, Context.CharTy) || 6021 Context.hasSameType(T, Context.WCharTy) || 6022 Context.hasSameType(T, Context.Char16Ty) || 6023 Context.hasSameType(T, Context.Char32Ty))) 6024 goto FinishedParams; 6025 6026 // The second and final parameter must be an std::size_t 6027 T = (*Param)->getType().getUnqualifiedType(); 6028 if (Context.hasSameType(T, Context.getSizeType()) && 6029 ++Param == FnDecl->param_end()) 6030 Valid = true; 6031 } 6032 6033 // FIXME: This diagnostic is absolutely terrible. 6034FinishedParams: 6035 if (!Valid) { 6036 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6037 << FnDecl->getDeclName(); 6038 return true; 6039 } 6040 6041 return false; 6042} 6043 6044/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6045/// linkage specification, including the language and (if present) 6046/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6047/// the location of the language string literal, which is provided 6048/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6049/// the '{' brace. Otherwise, this linkage specification does not 6050/// have any braces. 6051Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6052 SourceLocation ExternLoc, 6053 SourceLocation LangLoc, 6054 llvm::StringRef Lang, 6055 SourceLocation LBraceLoc) { 6056 LinkageSpecDecl::LanguageIDs Language; 6057 if (Lang == "\"C\"") 6058 Language = LinkageSpecDecl::lang_c; 6059 else if (Lang == "\"C++\"") 6060 Language = LinkageSpecDecl::lang_cxx; 6061 else { 6062 Diag(LangLoc, diag::err_bad_language); 6063 return 0; 6064 } 6065 6066 // FIXME: Add all the various semantics of linkage specifications 6067 6068 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6069 LangLoc, Language, 6070 LBraceLoc.isValid()); 6071 CurContext->addDecl(D); 6072 PushDeclContext(S, D); 6073 return D; 6074} 6075 6076/// ActOnFinishLinkageSpecification - Complete the definition of 6077/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6078/// valid, it's the position of the closing '}' brace in a linkage 6079/// specification that uses braces. 6080Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6081 Decl *LinkageSpec, 6082 SourceLocation RBraceLoc) { 6083 if (LinkageSpec) 6084 PopDeclContext(); 6085 return LinkageSpec; 6086} 6087 6088/// \brief Perform semantic analysis for the variable declaration that 6089/// occurs within a C++ catch clause, returning the newly-created 6090/// variable. 6091VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6092 TypeSourceInfo *TInfo, 6093 IdentifierInfo *Name, 6094 SourceLocation Loc) { 6095 bool Invalid = false; 6096 QualType ExDeclType = TInfo->getType(); 6097 6098 // Arrays and functions decay. 6099 if (ExDeclType->isArrayType()) 6100 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6101 else if (ExDeclType->isFunctionType()) 6102 ExDeclType = Context.getPointerType(ExDeclType); 6103 6104 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6105 // The exception-declaration shall not denote a pointer or reference to an 6106 // incomplete type, other than [cv] void*. 6107 // N2844 forbids rvalue references. 6108 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6109 Diag(Loc, diag::err_catch_rvalue_ref); 6110 Invalid = true; 6111 } 6112 6113 // GCC allows catching pointers and references to incomplete types 6114 // as an extension; so do we, but we warn by default. 6115 6116 QualType BaseType = ExDeclType; 6117 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6118 unsigned DK = diag::err_catch_incomplete; 6119 bool IncompleteCatchIsInvalid = true; 6120 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6121 BaseType = Ptr->getPointeeType(); 6122 Mode = 1; 6123 DK = diag::ext_catch_incomplete_ptr; 6124 IncompleteCatchIsInvalid = false; 6125 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6126 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6127 BaseType = Ref->getPointeeType(); 6128 Mode = 2; 6129 DK = diag::ext_catch_incomplete_ref; 6130 IncompleteCatchIsInvalid = false; 6131 } 6132 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6133 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6134 IncompleteCatchIsInvalid) 6135 Invalid = true; 6136 6137 if (!Invalid && !ExDeclType->isDependentType() && 6138 RequireNonAbstractType(Loc, ExDeclType, 6139 diag::err_abstract_type_in_decl, 6140 AbstractVariableType)) 6141 Invalid = true; 6142 6143 // Only the non-fragile NeXT runtime currently supports C++ catches 6144 // of ObjC types, and no runtime supports catching ObjC types by value. 6145 if (!Invalid && getLangOptions().ObjC1) { 6146 QualType T = ExDeclType; 6147 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6148 T = RT->getPointeeType(); 6149 6150 if (T->isObjCObjectType()) { 6151 Diag(Loc, diag::err_objc_object_catch); 6152 Invalid = true; 6153 } else if (T->isObjCObjectPointerType()) { 6154 if (!getLangOptions().NeXTRuntime) { 6155 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6156 Invalid = true; 6157 } else if (!getLangOptions().ObjCNonFragileABI) { 6158 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6159 Invalid = true; 6160 } 6161 } 6162 } 6163 6164 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6165 Name, ExDeclType, TInfo, SC_None, 6166 SC_None); 6167 ExDecl->setExceptionVariable(true); 6168 6169 if (!Invalid) { 6170 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6171 // C++ [except.handle]p16: 6172 // The object declared in an exception-declaration or, if the 6173 // exception-declaration does not specify a name, a temporary (12.2) is 6174 // copy-initialized (8.5) from the exception object. [...] 6175 // The object is destroyed when the handler exits, after the destruction 6176 // of any automatic objects initialized within the handler. 6177 // 6178 // We just pretend to initialize the object with itself, then make sure 6179 // it can be destroyed later. 6180 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6181 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6182 Loc, ExDeclType, 0); 6183 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6184 SourceLocation()); 6185 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6186 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6187 MultiExprArg(*this, &ExDeclRef, 1)); 6188 if (Result.isInvalid()) 6189 Invalid = true; 6190 else 6191 FinalizeVarWithDestructor(ExDecl, RecordTy); 6192 } 6193 } 6194 6195 if (Invalid) 6196 ExDecl->setInvalidDecl(); 6197 6198 return ExDecl; 6199} 6200 6201/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6202/// handler. 6203Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6204 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6205 QualType ExDeclType = TInfo->getType(); 6206 6207 bool Invalid = D.isInvalidType(); 6208 IdentifierInfo *II = D.getIdentifier(); 6209 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6210 LookupOrdinaryName, 6211 ForRedeclaration)) { 6212 // The scope should be freshly made just for us. There is just no way 6213 // it contains any previous declaration. 6214 assert(!S->isDeclScope(PrevDecl)); 6215 if (PrevDecl->isTemplateParameter()) { 6216 // Maybe we will complain about the shadowed template parameter. 6217 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6218 } 6219 } 6220 6221 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6222 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6223 << D.getCXXScopeSpec().getRange(); 6224 Invalid = true; 6225 } 6226 6227 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6228 D.getIdentifier(), 6229 D.getIdentifierLoc()); 6230 6231 if (Invalid) 6232 ExDecl->setInvalidDecl(); 6233 6234 // Add the exception declaration into this scope. 6235 if (II) 6236 PushOnScopeChains(ExDecl, S); 6237 else 6238 CurContext->addDecl(ExDecl); 6239 6240 ProcessDeclAttributes(S, ExDecl, D); 6241 return ExDecl; 6242} 6243 6244Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6245 Expr *AssertExpr, 6246 Expr *AssertMessageExpr_) { 6247 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6248 6249 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6250 llvm::APSInt Value(32); 6251 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6252 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6253 AssertExpr->getSourceRange(); 6254 return 0; 6255 } 6256 6257 if (Value == 0) { 6258 Diag(AssertLoc, diag::err_static_assert_failed) 6259 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6260 } 6261 } 6262 6263 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6264 AssertExpr, AssertMessage); 6265 6266 CurContext->addDecl(Decl); 6267 return Decl; 6268} 6269 6270/// \brief Perform semantic analysis of the given friend type declaration. 6271/// 6272/// \returns A friend declaration that. 6273FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6274 TypeSourceInfo *TSInfo) { 6275 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6276 6277 QualType T = TSInfo->getType(); 6278 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6279 6280 if (!getLangOptions().CPlusPlus0x) { 6281 // C++03 [class.friend]p2: 6282 // An elaborated-type-specifier shall be used in a friend declaration 6283 // for a class.* 6284 // 6285 // * The class-key of the elaborated-type-specifier is required. 6286 if (!ActiveTemplateInstantiations.empty()) { 6287 // Do not complain about the form of friend template types during 6288 // template instantiation; we will already have complained when the 6289 // template was declared. 6290 } else if (!T->isElaboratedTypeSpecifier()) { 6291 // If we evaluated the type to a record type, suggest putting 6292 // a tag in front. 6293 if (const RecordType *RT = T->getAs<RecordType>()) { 6294 RecordDecl *RD = RT->getDecl(); 6295 6296 std::string InsertionText = std::string(" ") + RD->getKindName(); 6297 6298 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6299 << (unsigned) RD->getTagKind() 6300 << T 6301 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6302 InsertionText); 6303 } else { 6304 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6305 << T 6306 << SourceRange(FriendLoc, TypeRange.getEnd()); 6307 } 6308 } else if (T->getAs<EnumType>()) { 6309 Diag(FriendLoc, diag::ext_enum_friend) 6310 << T 6311 << SourceRange(FriendLoc, TypeRange.getEnd()); 6312 } 6313 } 6314 6315 // C++0x [class.friend]p3: 6316 // If the type specifier in a friend declaration designates a (possibly 6317 // cv-qualified) class type, that class is declared as a friend; otherwise, 6318 // the friend declaration is ignored. 6319 6320 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6321 // in [class.friend]p3 that we do not implement. 6322 6323 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6324} 6325 6326/// Handle a friend type declaration. This works in tandem with 6327/// ActOnTag. 6328/// 6329/// Notes on friend class templates: 6330/// 6331/// We generally treat friend class declarations as if they were 6332/// declaring a class. So, for example, the elaborated type specifier 6333/// in a friend declaration is required to obey the restrictions of a 6334/// class-head (i.e. no typedefs in the scope chain), template 6335/// parameters are required to match up with simple template-ids, &c. 6336/// However, unlike when declaring a template specialization, it's 6337/// okay to refer to a template specialization without an empty 6338/// template parameter declaration, e.g. 6339/// friend class A<T>::B<unsigned>; 6340/// We permit this as a special case; if there are any template 6341/// parameters present at all, require proper matching, i.e. 6342/// template <> template <class T> friend class A<int>::B; 6343Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6344 MultiTemplateParamsArg TempParams) { 6345 SourceLocation Loc = DS.getSourceRange().getBegin(); 6346 6347 assert(DS.isFriendSpecified()); 6348 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6349 6350 // Try to convert the decl specifier to a type. This works for 6351 // friend templates because ActOnTag never produces a ClassTemplateDecl 6352 // for a TUK_Friend. 6353 Declarator TheDeclarator(DS, Declarator::MemberContext); 6354 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6355 QualType T = TSI->getType(); 6356 if (TheDeclarator.isInvalidType()) 6357 return 0; 6358 6359 // This is definitely an error in C++98. It's probably meant to 6360 // be forbidden in C++0x, too, but the specification is just 6361 // poorly written. 6362 // 6363 // The problem is with declarations like the following: 6364 // template <T> friend A<T>::foo; 6365 // where deciding whether a class C is a friend or not now hinges 6366 // on whether there exists an instantiation of A that causes 6367 // 'foo' to equal C. There are restrictions on class-heads 6368 // (which we declare (by fiat) elaborated friend declarations to 6369 // be) that makes this tractable. 6370 // 6371 // FIXME: handle "template <> friend class A<T>;", which 6372 // is possibly well-formed? Who even knows? 6373 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6374 Diag(Loc, diag::err_tagless_friend_type_template) 6375 << DS.getSourceRange(); 6376 return 0; 6377 } 6378 6379 // C++98 [class.friend]p1: A friend of a class is a function 6380 // or class that is not a member of the class . . . 6381 // This is fixed in DR77, which just barely didn't make the C++03 6382 // deadline. It's also a very silly restriction that seriously 6383 // affects inner classes and which nobody else seems to implement; 6384 // thus we never diagnose it, not even in -pedantic. 6385 // 6386 // But note that we could warn about it: it's always useless to 6387 // friend one of your own members (it's not, however, worthless to 6388 // friend a member of an arbitrary specialization of your template). 6389 6390 Decl *D; 6391 if (unsigned NumTempParamLists = TempParams.size()) 6392 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6393 NumTempParamLists, 6394 (TemplateParameterList**) TempParams.release(), 6395 TSI, 6396 DS.getFriendSpecLoc()); 6397 else 6398 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6399 6400 if (!D) 6401 return 0; 6402 6403 D->setAccess(AS_public); 6404 CurContext->addDecl(D); 6405 6406 return D; 6407} 6408 6409Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6410 Declarator &D, 6411 bool IsDefinition, 6412 MultiTemplateParamsArg TemplateParams) { 6413 const DeclSpec &DS = D.getDeclSpec(); 6414 6415 assert(DS.isFriendSpecified()); 6416 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6417 6418 SourceLocation Loc = D.getIdentifierLoc(); 6419 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6420 QualType T = TInfo->getType(); 6421 6422 // C++ [class.friend]p1 6423 // A friend of a class is a function or class.... 6424 // Note that this sees through typedefs, which is intended. 6425 // It *doesn't* see through dependent types, which is correct 6426 // according to [temp.arg.type]p3: 6427 // If a declaration acquires a function type through a 6428 // type dependent on a template-parameter and this causes 6429 // a declaration that does not use the syntactic form of a 6430 // function declarator to have a function type, the program 6431 // is ill-formed. 6432 if (!T->isFunctionType()) { 6433 Diag(Loc, diag::err_unexpected_friend); 6434 6435 // It might be worthwhile to try to recover by creating an 6436 // appropriate declaration. 6437 return 0; 6438 } 6439 6440 // C++ [namespace.memdef]p3 6441 // - If a friend declaration in a non-local class first declares a 6442 // class or function, the friend class or function is a member 6443 // of the innermost enclosing namespace. 6444 // - The name of the friend is not found by simple name lookup 6445 // until a matching declaration is provided in that namespace 6446 // scope (either before or after the class declaration granting 6447 // friendship). 6448 // - If a friend function is called, its name may be found by the 6449 // name lookup that considers functions from namespaces and 6450 // classes associated with the types of the function arguments. 6451 // - When looking for a prior declaration of a class or a function 6452 // declared as a friend, scopes outside the innermost enclosing 6453 // namespace scope are not considered. 6454 6455 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6456 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6457 DeclarationName Name = NameInfo.getName(); 6458 assert(Name); 6459 6460 // The context we found the declaration in, or in which we should 6461 // create the declaration. 6462 DeclContext *DC; 6463 6464 // FIXME: handle local classes 6465 6466 // Recover from invalid scope qualifiers as if they just weren't there. 6467 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6468 ForRedeclaration); 6469 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6470 DC = computeDeclContext(ScopeQual); 6471 6472 // FIXME: handle dependent contexts 6473 if (!DC) return 0; 6474 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6475 6476 LookupQualifiedName(Previous, DC); 6477 6478 // Ignore things found implicitly in the wrong scope. 6479 // TODO: better diagnostics for this case. Suggesting the right 6480 // qualified scope would be nice... 6481 LookupResult::Filter F = Previous.makeFilter(); 6482 while (F.hasNext()) { 6483 NamedDecl *D = F.next(); 6484 if (!DC->InEnclosingNamespaceSetOf( 6485 D->getDeclContext()->getRedeclContext())) 6486 F.erase(); 6487 } 6488 F.done(); 6489 6490 if (Previous.empty()) { 6491 D.setInvalidType(); 6492 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6493 return 0; 6494 } 6495 6496 // C++ [class.friend]p1: A friend of a class is a function or 6497 // class that is not a member of the class . . . 6498 if (DC->Equals(CurContext)) 6499 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6500 6501 // Otherwise walk out to the nearest namespace scope looking for matches. 6502 } else { 6503 // TODO: handle local class contexts. 6504 6505 DC = CurContext; 6506 while (true) { 6507 // Skip class contexts. If someone can cite chapter and verse 6508 // for this behavior, that would be nice --- it's what GCC and 6509 // EDG do, and it seems like a reasonable intent, but the spec 6510 // really only says that checks for unqualified existing 6511 // declarations should stop at the nearest enclosing namespace, 6512 // not that they should only consider the nearest enclosing 6513 // namespace. 6514 while (DC->isRecord()) 6515 DC = DC->getParent(); 6516 6517 LookupQualifiedName(Previous, DC); 6518 6519 // TODO: decide what we think about using declarations. 6520 if (!Previous.empty()) 6521 break; 6522 6523 if (DC->isFileContext()) break; 6524 DC = DC->getParent(); 6525 } 6526 6527 // C++ [class.friend]p1: A friend of a class is a function or 6528 // class that is not a member of the class . . . 6529 // C++0x changes this for both friend types and functions. 6530 // Most C++ 98 compilers do seem to give an error here, so 6531 // we do, too. 6532 if (!Previous.empty() && DC->Equals(CurContext) 6533 && !getLangOptions().CPlusPlus0x) 6534 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6535 } 6536 6537 if (DC->isFileContext()) { 6538 // This implies that it has to be an operator or function. 6539 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6540 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6541 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6542 Diag(Loc, diag::err_introducing_special_friend) << 6543 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6544 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6545 return 0; 6546 } 6547 } 6548 6549 bool Redeclaration = false; 6550 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6551 move(TemplateParams), 6552 IsDefinition, 6553 Redeclaration); 6554 if (!ND) return 0; 6555 6556 assert(ND->getDeclContext() == DC); 6557 assert(ND->getLexicalDeclContext() == CurContext); 6558 6559 // Add the function declaration to the appropriate lookup tables, 6560 // adjusting the redeclarations list as necessary. We don't 6561 // want to do this yet if the friending class is dependent. 6562 // 6563 // Also update the scope-based lookup if the target context's 6564 // lookup context is in lexical scope. 6565 if (!CurContext->isDependentContext()) { 6566 DC = DC->getRedeclContext(); 6567 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6568 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6569 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6570 } 6571 6572 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6573 D.getIdentifierLoc(), ND, 6574 DS.getFriendSpecLoc()); 6575 FrD->setAccess(AS_public); 6576 CurContext->addDecl(FrD); 6577 6578 return ND; 6579} 6580 6581void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6582 AdjustDeclIfTemplate(Dcl); 6583 6584 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6585 if (!Fn) { 6586 Diag(DelLoc, diag::err_deleted_non_function); 6587 return; 6588 } 6589 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6590 Diag(DelLoc, diag::err_deleted_decl_not_first); 6591 Diag(Prev->getLocation(), diag::note_previous_declaration); 6592 // If the declaration wasn't the first, we delete the function anyway for 6593 // recovery. 6594 } 6595 Fn->setDeleted(); 6596} 6597 6598static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6599 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6600 ++CI) { 6601 Stmt *SubStmt = *CI; 6602 if (!SubStmt) 6603 continue; 6604 if (isa<ReturnStmt>(SubStmt)) 6605 Self.Diag(SubStmt->getSourceRange().getBegin(), 6606 diag::err_return_in_constructor_handler); 6607 if (!isa<Expr>(SubStmt)) 6608 SearchForReturnInStmt(Self, SubStmt); 6609 } 6610} 6611 6612void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6613 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6614 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6615 SearchForReturnInStmt(*this, Handler); 6616 } 6617} 6618 6619bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6620 const CXXMethodDecl *Old) { 6621 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6622 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6623 6624 if (Context.hasSameType(NewTy, OldTy) || 6625 NewTy->isDependentType() || OldTy->isDependentType()) 6626 return false; 6627 6628 // Check if the return types are covariant 6629 QualType NewClassTy, OldClassTy; 6630 6631 /// Both types must be pointers or references to classes. 6632 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6633 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6634 NewClassTy = NewPT->getPointeeType(); 6635 OldClassTy = OldPT->getPointeeType(); 6636 } 6637 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6638 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6639 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6640 NewClassTy = NewRT->getPointeeType(); 6641 OldClassTy = OldRT->getPointeeType(); 6642 } 6643 } 6644 } 6645 6646 // The return types aren't either both pointers or references to a class type. 6647 if (NewClassTy.isNull()) { 6648 Diag(New->getLocation(), 6649 diag::err_different_return_type_for_overriding_virtual_function) 6650 << New->getDeclName() << NewTy << OldTy; 6651 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6652 6653 return true; 6654 } 6655 6656 // C++ [class.virtual]p6: 6657 // If the return type of D::f differs from the return type of B::f, the 6658 // class type in the return type of D::f shall be complete at the point of 6659 // declaration of D::f or shall be the class type D. 6660 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6661 if (!RT->isBeingDefined() && 6662 RequireCompleteType(New->getLocation(), NewClassTy, 6663 PDiag(diag::err_covariant_return_incomplete) 6664 << New->getDeclName())) 6665 return true; 6666 } 6667 6668 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6669 // Check if the new class derives from the old class. 6670 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6671 Diag(New->getLocation(), 6672 diag::err_covariant_return_not_derived) 6673 << New->getDeclName() << NewTy << OldTy; 6674 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6675 return true; 6676 } 6677 6678 // Check if we the conversion from derived to base is valid. 6679 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6680 diag::err_covariant_return_inaccessible_base, 6681 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6682 // FIXME: Should this point to the return type? 6683 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6684 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6685 return true; 6686 } 6687 } 6688 6689 // The qualifiers of the return types must be the same. 6690 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6691 Diag(New->getLocation(), 6692 diag::err_covariant_return_type_different_qualifications) 6693 << New->getDeclName() << NewTy << OldTy; 6694 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6695 return true; 6696 }; 6697 6698 6699 // The new class type must have the same or less qualifiers as the old type. 6700 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6701 Diag(New->getLocation(), 6702 diag::err_covariant_return_type_class_type_more_qualified) 6703 << New->getDeclName() << NewTy << OldTy; 6704 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6705 return true; 6706 }; 6707 6708 return false; 6709} 6710 6711bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6712 const CXXMethodDecl *Old) 6713{ 6714 if (Old->hasAttr<FinalAttr>()) { 6715 Diag(New->getLocation(), diag::err_final_function_overridden) 6716 << New->getDeclName(); 6717 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6718 return true; 6719 } 6720 6721 return false; 6722} 6723 6724/// \brief Mark the given method pure. 6725/// 6726/// \param Method the method to be marked pure. 6727/// 6728/// \param InitRange the source range that covers the "0" initializer. 6729bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6730 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6731 Method->setPure(); 6732 6733 // A class is abstract if at least one function is pure virtual. 6734 Method->getParent()->setAbstract(true); 6735 return false; 6736 } 6737 6738 if (!Method->isInvalidDecl()) 6739 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6740 << Method->getDeclName() << InitRange; 6741 return true; 6742} 6743 6744/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6745/// an initializer for the out-of-line declaration 'Dcl'. The scope 6746/// is a fresh scope pushed for just this purpose. 6747/// 6748/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6749/// static data member of class X, names should be looked up in the scope of 6750/// class X. 6751void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6752 // If there is no declaration, there was an error parsing it. 6753 if (D == 0) return; 6754 6755 // We should only get called for declarations with scope specifiers, like: 6756 // int foo::bar; 6757 assert(D->isOutOfLine()); 6758 EnterDeclaratorContext(S, D->getDeclContext()); 6759} 6760 6761/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6762/// initializer for the out-of-line declaration 'D'. 6763void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6764 // If there is no declaration, there was an error parsing it. 6765 if (D == 0) return; 6766 6767 assert(D->isOutOfLine()); 6768 ExitDeclaratorContext(S); 6769} 6770 6771/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6772/// C++ if/switch/while/for statement. 6773/// e.g: "if (int x = f()) {...}" 6774DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6775 // C++ 6.4p2: 6776 // The declarator shall not specify a function or an array. 6777 // The type-specifier-seq shall not contain typedef and shall not declare a 6778 // new class or enumeration. 6779 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6780 "Parser allowed 'typedef' as storage class of condition decl."); 6781 6782 TagDecl *OwnedTag = 0; 6783 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6784 QualType Ty = TInfo->getType(); 6785 6786 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6787 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6788 // would be created and CXXConditionDeclExpr wants a VarDecl. 6789 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6790 << D.getSourceRange(); 6791 return DeclResult(); 6792 } else if (OwnedTag && OwnedTag->isDefinition()) { 6793 // The type-specifier-seq shall not declare a new class or enumeration. 6794 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6795 } 6796 6797 Decl *Dcl = ActOnDeclarator(S, D); 6798 if (!Dcl) 6799 return DeclResult(); 6800 6801 return Dcl; 6802} 6803 6804void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6805 bool DefinitionRequired) { 6806 // Ignore any vtable uses in unevaluated operands or for classes that do 6807 // not have a vtable. 6808 if (!Class->isDynamicClass() || Class->isDependentContext() || 6809 CurContext->isDependentContext() || 6810 ExprEvalContexts.back().Context == Unevaluated) 6811 return; 6812 6813 // Try to insert this class into the map. 6814 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6815 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6816 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6817 if (!Pos.second) { 6818 // If we already had an entry, check to see if we are promoting this vtable 6819 // to required a definition. If so, we need to reappend to the VTableUses 6820 // list, since we may have already processed the first entry. 6821 if (DefinitionRequired && !Pos.first->second) { 6822 Pos.first->second = true; 6823 } else { 6824 // Otherwise, we can early exit. 6825 return; 6826 } 6827 } 6828 6829 // Local classes need to have their virtual members marked 6830 // immediately. For all other classes, we mark their virtual members 6831 // at the end of the translation unit. 6832 if (Class->isLocalClass()) 6833 MarkVirtualMembersReferenced(Loc, Class); 6834 else 6835 VTableUses.push_back(std::make_pair(Class, Loc)); 6836} 6837 6838bool Sema::DefineUsedVTables() { 6839 // If any dynamic classes have their key function defined within 6840 // this translation unit, then those vtables are considered "used" and must 6841 // be emitted. 6842 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6843 if (const CXXMethodDecl *KeyFunction 6844 = Context.getKeyFunction(DynamicClasses[I])) { 6845 const FunctionDecl *Definition = 0; 6846 if (KeyFunction->hasBody(Definition)) 6847 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6848 } 6849 } 6850 6851 if (VTableUses.empty()) 6852 return false; 6853 6854 // Note: The VTableUses vector could grow as a result of marking 6855 // the members of a class as "used", so we check the size each 6856 // time through the loop and prefer indices (with are stable) to 6857 // iterators (which are not). 6858 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6859 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6860 if (!Class) 6861 continue; 6862 6863 SourceLocation Loc = VTableUses[I].second; 6864 6865 // If this class has a key function, but that key function is 6866 // defined in another translation unit, we don't need to emit the 6867 // vtable even though we're using it. 6868 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6869 if (KeyFunction && !KeyFunction->hasBody()) { 6870 switch (KeyFunction->getTemplateSpecializationKind()) { 6871 case TSK_Undeclared: 6872 case TSK_ExplicitSpecialization: 6873 case TSK_ExplicitInstantiationDeclaration: 6874 // The key function is in another translation unit. 6875 continue; 6876 6877 case TSK_ExplicitInstantiationDefinition: 6878 case TSK_ImplicitInstantiation: 6879 // We will be instantiating the key function. 6880 break; 6881 } 6882 } else if (!KeyFunction) { 6883 // If we have a class with no key function that is the subject 6884 // of an explicit instantiation declaration, suppress the 6885 // vtable; it will live with the explicit instantiation 6886 // definition. 6887 bool IsExplicitInstantiationDeclaration 6888 = Class->getTemplateSpecializationKind() 6889 == TSK_ExplicitInstantiationDeclaration; 6890 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6891 REnd = Class->redecls_end(); 6892 R != REnd; ++R) { 6893 TemplateSpecializationKind TSK 6894 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6895 if (TSK == TSK_ExplicitInstantiationDeclaration) 6896 IsExplicitInstantiationDeclaration = true; 6897 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6898 IsExplicitInstantiationDeclaration = false; 6899 break; 6900 } 6901 } 6902 6903 if (IsExplicitInstantiationDeclaration) 6904 continue; 6905 } 6906 6907 // Mark all of the virtual members of this class as referenced, so 6908 // that we can build a vtable. Then, tell the AST consumer that a 6909 // vtable for this class is required. 6910 MarkVirtualMembersReferenced(Loc, Class); 6911 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6912 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6913 6914 // Optionally warn if we're emitting a weak vtable. 6915 if (Class->getLinkage() == ExternalLinkage && 6916 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6917 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6918 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6919 } 6920 } 6921 VTableUses.clear(); 6922 6923 return true; 6924} 6925 6926void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6927 const CXXRecordDecl *RD) { 6928 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6929 e = RD->method_end(); i != e; ++i) { 6930 CXXMethodDecl *MD = *i; 6931 6932 // C++ [basic.def.odr]p2: 6933 // [...] A virtual member function is used if it is not pure. [...] 6934 if (MD->isVirtual() && !MD->isPure()) 6935 MarkDeclarationReferenced(Loc, MD); 6936 } 6937 6938 // Only classes that have virtual bases need a VTT. 6939 if (RD->getNumVBases() == 0) 6940 return; 6941 6942 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6943 e = RD->bases_end(); i != e; ++i) { 6944 const CXXRecordDecl *Base = 6945 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6946 if (Base->getNumVBases() == 0) 6947 continue; 6948 MarkVirtualMembersReferenced(Loc, Base); 6949 } 6950} 6951 6952/// SetIvarInitializers - This routine builds initialization ASTs for the 6953/// Objective-C implementation whose ivars need be initialized. 6954void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6955 if (!getLangOptions().CPlusPlus) 6956 return; 6957 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6958 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6959 CollectIvarsToConstructOrDestruct(OID, ivars); 6960 if (ivars.empty()) 6961 return; 6962 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6963 for (unsigned i = 0; i < ivars.size(); i++) { 6964 FieldDecl *Field = ivars[i]; 6965 if (Field->isInvalidDecl()) 6966 continue; 6967 6968 CXXBaseOrMemberInitializer *Member; 6969 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6970 InitializationKind InitKind = 6971 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6972 6973 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6974 ExprResult MemberInit = 6975 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 6976 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6977 // Note, MemberInit could actually come back empty if no initialization 6978 // is required (e.g., because it would call a trivial default constructor) 6979 if (!MemberInit.get() || MemberInit.isInvalid()) 6980 continue; 6981 6982 Member = 6983 new (Context) CXXBaseOrMemberInitializer(Context, 6984 Field, SourceLocation(), 6985 SourceLocation(), 6986 MemberInit.takeAs<Expr>(), 6987 SourceLocation()); 6988 AllToInit.push_back(Member); 6989 6990 // Be sure that the destructor is accessible and is marked as referenced. 6991 if (const RecordType *RecordTy 6992 = Context.getBaseElementType(Field->getType()) 6993 ->getAs<RecordType>()) { 6994 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6995 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6996 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6997 CheckDestructorAccess(Field->getLocation(), Destructor, 6998 PDiag(diag::err_access_dtor_ivar) 6999 << Context.getBaseElementType(Field->getType())); 7000 } 7001 } 7002 } 7003 ObjCImplementation->setIvarInitializers(Context, 7004 AllToInit.data(), AllToInit.size()); 7005 } 7006} 7007