SemaDeclCXX.cpp revision 769b4dd31d3f1b911a1a7442eae93c670af6efeb
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/Sema.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Sema/DeclSpec.h" 27#include "clang/Sema/ParsedTemplate.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 // C++ [dcl.fct.default]p5 120 // A default argument expression is implicitly converted (clause 121 // 4) to the parameter type. The default argument expression has 122 // the same semantic constraints as the initializer expression in 123 // a declaration of a variable of the parameter type, using the 124 // copy-initialization semantics (8.5). 125 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 126 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 127 EqualLoc); 128 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 129 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 130 MultiExprArg(*this, &Arg, 1)); 131 if (Result.isInvalid()) 132 return true; 133 Arg = Result.takeAs<Expr>(); 134 135 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 136 137 // Okay: add the default argument to the parameter 138 Param->setDefaultArg(Arg); 139 140 return false; 141} 142 143/// ActOnParamDefaultArgument - Check whether the default argument 144/// provided for a function parameter is well-formed. If so, attach it 145/// to the parameter declaration. 146void 147Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 148 Expr *DefaultArg) { 149 if (!param || !DefaultArg) 150 return; 151 152 ParmVarDecl *Param = cast<ParmVarDecl>(param); 153 UnparsedDefaultArgLocs.erase(Param); 154 155 // Default arguments are only permitted in C++ 156 if (!getLangOptions().CPlusPlus) { 157 Diag(EqualLoc, diag::err_param_default_argument) 158 << DefaultArg->getSourceRange(); 159 Param->setInvalidDecl(); 160 return; 161 } 162 163 // Check that the default argument is well-formed 164 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 165 if (DefaultArgChecker.Visit(DefaultArg)) { 166 Param->setInvalidDecl(); 167 return; 168 } 169 170 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 171} 172 173/// ActOnParamUnparsedDefaultArgument - We've seen a default 174/// argument for a function parameter, but we can't parse it yet 175/// because we're inside a class definition. Note that this default 176/// argument will be parsed later. 177void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 178 SourceLocation EqualLoc, 179 SourceLocation ArgLoc) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param); 184 if (Param) 185 Param->setUnparsedDefaultArg(); 186 187 UnparsedDefaultArgLocs[Param] = ArgLoc; 188} 189 190/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 191/// the default argument for the parameter param failed. 192void Sema::ActOnParamDefaultArgumentError(Decl *param) { 193 if (!param) 194 return; 195 196 ParmVarDecl *Param = cast<ParmVarDecl>(param); 197 198 Param->setInvalidDecl(); 199 200 UnparsedDefaultArgLocs.erase(Param); 201} 202 203/// CheckExtraCXXDefaultArguments - Check for any extra default 204/// arguments in the declarator, which is not a function declaration 205/// or definition and therefore is not permitted to have default 206/// arguments. This routine should be invoked for every declarator 207/// that is not a function declaration or definition. 208void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 209 // C++ [dcl.fct.default]p3 210 // A default argument expression shall be specified only in the 211 // parameter-declaration-clause of a function declaration or in a 212 // template-parameter (14.1). It shall not be specified for a 213 // parameter pack. If it is specified in a 214 // parameter-declaration-clause, it shall not occur within a 215 // declarator or abstract-declarator of a parameter-declaration. 216 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 217 DeclaratorChunk &chunk = D.getTypeObject(i); 218 if (chunk.Kind == DeclaratorChunk::Function) { 219 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 220 ParmVarDecl *Param = 221 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 222 if (Param->hasUnparsedDefaultArg()) { 223 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 224 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 225 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 226 delete Toks; 227 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 228 } else if (Param->getDefaultArg()) { 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << Param->getDefaultArg()->getSourceRange(); 231 Param->setDefaultArg(0); 232 } 233 } 234 } 235 } 236} 237 238// MergeCXXFunctionDecl - Merge two declarations of the same C++ 239// function, once we already know that they have the same 240// type. Subroutine of MergeFunctionDecl. Returns true if there was an 241// error, false otherwise. 242bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 243 bool Invalid = false; 244 245 // C++ [dcl.fct.default]p4: 246 // For non-template functions, default arguments can be added in 247 // later declarations of a function in the same 248 // scope. Declarations in different scopes have completely 249 // distinct sets of default arguments. That is, declarations in 250 // inner scopes do not acquire default arguments from 251 // declarations in outer scopes, and vice versa. In a given 252 // function declaration, all parameters subsequent to a 253 // parameter with a default argument shall have default 254 // arguments supplied in this or previous declarations. A 255 // default argument shall not be redefined by a later 256 // declaration (not even to the same value). 257 // 258 // C++ [dcl.fct.default]p6: 259 // Except for member functions of class templates, the default arguments 260 // in a member function definition that appears outside of the class 261 // definition are added to the set of default arguments provided by the 262 // member function declaration in the class definition. 263 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 264 ParmVarDecl *OldParam = Old->getParamDecl(p); 265 ParmVarDecl *NewParam = New->getParamDecl(p); 266 267 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 268 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 269 // hint here. Alternatively, we could walk the type-source information 270 // for NewParam to find the last source location in the type... but it 271 // isn't worth the effort right now. This is the kind of test case that 272 // is hard to get right: 273 274 // int f(int); 275 // void g(int (*fp)(int) = f); 276 // void g(int (*fp)(int) = &f); 277 Diag(NewParam->getLocation(), 278 diag::err_param_default_argument_redefinition) 279 << NewParam->getDefaultArgRange(); 280 281 // Look for the function declaration where the default argument was 282 // actually written, which may be a declaration prior to Old. 283 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 284 Older; Older = Older->getPreviousDeclaration()) { 285 if (!Older->getParamDecl(p)->hasDefaultArg()) 286 break; 287 288 OldParam = Older->getParamDecl(p); 289 } 290 291 Diag(OldParam->getLocation(), diag::note_previous_definition) 292 << OldParam->getDefaultArgRange(); 293 Invalid = true; 294 } else if (OldParam->hasDefaultArg()) { 295 // Merge the old default argument into the new parameter. 296 // It's important to use getInit() here; getDefaultArg() 297 // strips off any top-level CXXExprWithTemporaries. 298 NewParam->setHasInheritedDefaultArg(); 299 if (OldParam->hasUninstantiatedDefaultArg()) 300 NewParam->setUninstantiatedDefaultArg( 301 OldParam->getUninstantiatedDefaultArg()); 302 else 303 NewParam->setDefaultArg(OldParam->getInit()); 304 } else if (NewParam->hasDefaultArg()) { 305 if (New->getDescribedFunctionTemplate()) { 306 // Paragraph 4, quoted above, only applies to non-template functions. 307 Diag(NewParam->getLocation(), 308 diag::err_param_default_argument_template_redecl) 309 << NewParam->getDefaultArgRange(); 310 Diag(Old->getLocation(), diag::note_template_prev_declaration) 311 << false; 312 } else if (New->getTemplateSpecializationKind() 313 != TSK_ImplicitInstantiation && 314 New->getTemplateSpecializationKind() != TSK_Undeclared) { 315 // C++ [temp.expr.spec]p21: 316 // Default function arguments shall not be specified in a declaration 317 // or a definition for one of the following explicit specializations: 318 // - the explicit specialization of a function template; 319 // - the explicit specialization of a member function template; 320 // - the explicit specialization of a member function of a class 321 // template where the class template specialization to which the 322 // member function specialization belongs is implicitly 323 // instantiated. 324 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 325 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 326 << New->getDeclName() 327 << NewParam->getDefaultArgRange(); 328 } else if (New->getDeclContext()->isDependentContext()) { 329 // C++ [dcl.fct.default]p6 (DR217): 330 // Default arguments for a member function of a class template shall 331 // be specified on the initial declaration of the member function 332 // within the class template. 333 // 334 // Reading the tea leaves a bit in DR217 and its reference to DR205 335 // leads me to the conclusion that one cannot add default function 336 // arguments for an out-of-line definition of a member function of a 337 // dependent type. 338 int WhichKind = 2; 339 if (CXXRecordDecl *Record 340 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 341 if (Record->getDescribedClassTemplate()) 342 WhichKind = 0; 343 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 344 WhichKind = 1; 345 else 346 WhichKind = 2; 347 } 348 349 Diag(NewParam->getLocation(), 350 diag::err_param_default_argument_member_template_redecl) 351 << WhichKind 352 << NewParam->getDefaultArgRange(); 353 } 354 } 355 } 356 357 if (CheckEquivalentExceptionSpec(Old, New)) 358 Invalid = true; 359 360 return Invalid; 361} 362 363/// CheckCXXDefaultArguments - Verify that the default arguments for a 364/// function declaration are well-formed according to C++ 365/// [dcl.fct.default]. 366void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 367 unsigned NumParams = FD->getNumParams(); 368 unsigned p; 369 370 // Find first parameter with a default argument 371 for (p = 0; p < NumParams; ++p) { 372 ParmVarDecl *Param = FD->getParamDecl(p); 373 if (Param->hasDefaultArg()) 374 break; 375 } 376 377 // C++ [dcl.fct.default]p4: 378 // In a given function declaration, all parameters 379 // subsequent to a parameter with a default argument shall 380 // have default arguments supplied in this or previous 381 // declarations. A default argument shall not be redefined 382 // by a later declaration (not even to the same value). 383 unsigned LastMissingDefaultArg = 0; 384 for (; p < NumParams; ++p) { 385 ParmVarDecl *Param = FD->getParamDecl(p); 386 if (!Param->hasDefaultArg()) { 387 if (Param->isInvalidDecl()) 388 /* We already complained about this parameter. */; 389 else if (Param->getIdentifier()) 390 Diag(Param->getLocation(), 391 diag::err_param_default_argument_missing_name) 392 << Param->getIdentifier(); 393 else 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing); 396 397 LastMissingDefaultArg = p; 398 } 399 } 400 401 if (LastMissingDefaultArg > 0) { 402 // Some default arguments were missing. Clear out all of the 403 // default arguments up to (and including) the last missing 404 // default argument, so that we leave the function parameters 405 // in a semantically valid state. 406 for (p = 0; p <= LastMissingDefaultArg; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (Param->hasDefaultArg()) { 409 Param->setDefaultArg(0); 410 } 411 } 412 } 413} 414 415/// isCurrentClassName - Determine whether the identifier II is the 416/// name of the class type currently being defined. In the case of 417/// nested classes, this will only return true if II is the name of 418/// the innermost class. 419bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 420 const CXXScopeSpec *SS) { 421 assert(getLangOptions().CPlusPlus && "No class names in C!"); 422 423 CXXRecordDecl *CurDecl; 424 if (SS && SS->isSet() && !SS->isInvalid()) { 425 DeclContext *DC = computeDeclContext(*SS, true); 426 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 427 } else 428 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 429 430 if (CurDecl && CurDecl->getIdentifier()) 431 return &II == CurDecl->getIdentifier(); 432 else 433 return false; 434} 435 436/// \brief Check the validity of a C++ base class specifier. 437/// 438/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 439/// and returns NULL otherwise. 440CXXBaseSpecifier * 441Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 442 SourceRange SpecifierRange, 443 bool Virtual, AccessSpecifier Access, 444 TypeSourceInfo *TInfo) { 445 QualType BaseType = TInfo->getType(); 446 447 // C++ [class.union]p1: 448 // A union shall not have base classes. 449 if (Class->isUnion()) { 450 Diag(Class->getLocation(), diag::err_base_clause_on_union) 451 << SpecifierRange; 452 return 0; 453 } 454 455 if (BaseType->isDependentType()) 456 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 457 Class->getTagKind() == TTK_Class, 458 Access, TInfo); 459 460 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 461 462 // Base specifiers must be record types. 463 if (!BaseType->isRecordType()) { 464 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 465 return 0; 466 } 467 468 // C++ [class.union]p1: 469 // A union shall not be used as a base class. 470 if (BaseType->isUnionType()) { 471 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 472 return 0; 473 } 474 475 // C++ [class.derived]p2: 476 // The class-name in a base-specifier shall not be an incompletely 477 // defined class. 478 if (RequireCompleteType(BaseLoc, BaseType, 479 PDiag(diag::err_incomplete_base_class) 480 << SpecifierRange)) { 481 Class->setInvalidDecl(); 482 return 0; 483 } 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 if (BaseDecl->isInvalidDecl()) 504 Class->setInvalidDecl(); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, TInfo); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 593 if (!Class) 594 return true; 595 596 TypeSourceInfo *TInfo = 0; 597 GetTypeFromParser(basetype, &TInfo); 598 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 599 Virtual, Access, TInfo)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXCastPath &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 747 for (CXXCastPath::const_iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXCastPath *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXCastPath *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 875Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 876 SourceLocation ASLoc, 877 SourceLocation ColonLoc) { 878 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 879 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 880 ASLoc, ColonLoc); 881 CurContext->addHiddenDecl(ASDecl); 882 return ASDecl; 883} 884 885/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 886/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 887/// bitfield width if there is one and 'InitExpr' specifies the initializer if 888/// any. 889Decl * 890Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 891 MultiTemplateParamsArg TemplateParameterLists, 892 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 893 bool Deleted) { 894 const DeclSpec &DS = D.getDeclSpec(); 895 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 896 DeclarationName Name = NameInfo.getName(); 897 SourceLocation Loc = NameInfo.getLoc(); 898 Expr *BitWidth = static_cast<Expr*>(BW); 899 Expr *Init = static_cast<Expr*>(InitExpr); 900 901 assert(isa<CXXRecordDecl>(CurContext)); 902 assert(!DS.isFriendSpecified()); 903 904 bool isFunc = false; 905 if (D.isFunctionDeclarator()) 906 isFunc = true; 907 else if (D.getNumTypeObjects() == 0 && 908 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 909 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 910 isFunc = TDType->isFunctionType(); 911 } 912 913 // C++ 9.2p6: A member shall not be declared to have automatic storage 914 // duration (auto, register) or with the extern storage-class-specifier. 915 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 916 // data members and cannot be applied to names declared const or static, 917 // and cannot be applied to reference members. 918 switch (DS.getStorageClassSpec()) { 919 case DeclSpec::SCS_unspecified: 920 case DeclSpec::SCS_typedef: 921 case DeclSpec::SCS_static: 922 // FALL THROUGH. 923 break; 924 case DeclSpec::SCS_mutable: 925 if (isFunc) { 926 if (DS.getStorageClassSpecLoc().isValid()) 927 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 928 else 929 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 930 931 // FIXME: It would be nicer if the keyword was ignored only for this 932 // declarator. Otherwise we could get follow-up errors. 933 D.getMutableDeclSpec().ClearStorageClassSpecs(); 934 } 935 break; 936 default: 937 if (DS.getStorageClassSpecLoc().isValid()) 938 Diag(DS.getStorageClassSpecLoc(), 939 diag::err_storageclass_invalid_for_member); 940 else 941 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 943 } 944 945 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 946 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 947 !isFunc); 948 949 Decl *Member; 950 if (isInstField) { 951 // FIXME: Check for template parameters! 952 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 953 AS); 954 assert(Member && "HandleField never returns null"); 955 } else { 956 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 957 if (!Member) { 958 if (BitWidth) DeleteExpr(BitWidth); 959 return 0; 960 } 961 962 // Non-instance-fields can't have a bitfield. 963 if (BitWidth) { 964 if (Member->isInvalidDecl()) { 965 // don't emit another diagnostic. 966 } else if (isa<VarDecl>(Member)) { 967 // C++ 9.6p3: A bit-field shall not be a static member. 968 // "static member 'A' cannot be a bit-field" 969 Diag(Loc, diag::err_static_not_bitfield) 970 << Name << BitWidth->getSourceRange(); 971 } else if (isa<TypedefDecl>(Member)) { 972 // "typedef member 'x' cannot be a bit-field" 973 Diag(Loc, diag::err_typedef_not_bitfield) 974 << Name << BitWidth->getSourceRange(); 975 } else { 976 // A function typedef ("typedef int f(); f a;"). 977 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 978 Diag(Loc, diag::err_not_integral_type_bitfield) 979 << Name << cast<ValueDecl>(Member)->getType() 980 << BitWidth->getSourceRange(); 981 } 982 983 DeleteExpr(BitWidth); 984 BitWidth = 0; 985 Member->setInvalidDecl(); 986 } 987 988 Member->setAccess(AS); 989 990 // If we have declared a member function template, set the access of the 991 // templated declaration as well. 992 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 993 FunTmpl->getTemplatedDecl()->setAccess(AS); 994 } 995 996 assert((Name || isInstField) && "No identifier for non-field ?"); 997 998 if (Init) 999 AddInitializerToDecl(Member, Init, false); 1000 if (Deleted) // FIXME: Source location is not very good. 1001 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1002 1003 if (isInstField) { 1004 FieldCollector->Add(cast<FieldDecl>(Member)); 1005 return 0; 1006 } 1007 return Member; 1008} 1009 1010/// \brief Find the direct and/or virtual base specifiers that 1011/// correspond to the given base type, for use in base initialization 1012/// within a constructor. 1013static bool FindBaseInitializer(Sema &SemaRef, 1014 CXXRecordDecl *ClassDecl, 1015 QualType BaseType, 1016 const CXXBaseSpecifier *&DirectBaseSpec, 1017 const CXXBaseSpecifier *&VirtualBaseSpec) { 1018 // First, check for a direct base class. 1019 DirectBaseSpec = 0; 1020 for (CXXRecordDecl::base_class_const_iterator Base 1021 = ClassDecl->bases_begin(); 1022 Base != ClassDecl->bases_end(); ++Base) { 1023 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1024 // We found a direct base of this type. That's what we're 1025 // initializing. 1026 DirectBaseSpec = &*Base; 1027 break; 1028 } 1029 } 1030 1031 // Check for a virtual base class. 1032 // FIXME: We might be able to short-circuit this if we know in advance that 1033 // there are no virtual bases. 1034 VirtualBaseSpec = 0; 1035 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1036 // We haven't found a base yet; search the class hierarchy for a 1037 // virtual base class. 1038 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1039 /*DetectVirtual=*/false); 1040 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1041 BaseType, Paths)) { 1042 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1043 Path != Paths.end(); ++Path) { 1044 if (Path->back().Base->isVirtual()) { 1045 VirtualBaseSpec = Path->back().Base; 1046 break; 1047 } 1048 } 1049 } 1050 } 1051 1052 return DirectBaseSpec || VirtualBaseSpec; 1053} 1054 1055/// ActOnMemInitializer - Handle a C++ member initializer. 1056Sema::MemInitResult 1057Sema::ActOnMemInitializer(Decl *ConstructorD, 1058 Scope *S, 1059 CXXScopeSpec &SS, 1060 IdentifierInfo *MemberOrBase, 1061 TypeTy *TemplateTypeTy, 1062 SourceLocation IdLoc, 1063 SourceLocation LParenLoc, 1064 ExprTy **Args, unsigned NumArgs, 1065 SourceLocation *CommaLocs, 1066 SourceLocation RParenLoc) { 1067 if (!ConstructorD) 1068 return true; 1069 1070 AdjustDeclIfTemplate(ConstructorD); 1071 1072 CXXConstructorDecl *Constructor 1073 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1074 if (!Constructor) { 1075 // The user wrote a constructor initializer on a function that is 1076 // not a C++ constructor. Ignore the error for now, because we may 1077 // have more member initializers coming; we'll diagnose it just 1078 // once in ActOnMemInitializers. 1079 return true; 1080 } 1081 1082 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1083 1084 // C++ [class.base.init]p2: 1085 // Names in a mem-initializer-id are looked up in the scope of the 1086 // constructor’s class and, if not found in that scope, are looked 1087 // up in the scope containing the constructor’s 1088 // definition. [Note: if the constructor’s class contains a member 1089 // with the same name as a direct or virtual base class of the 1090 // class, a mem-initializer-id naming the member or base class and 1091 // composed of a single identifier refers to the class member. A 1092 // mem-initializer-id for the hidden base class may be specified 1093 // using a qualified name. ] 1094 if (!SS.getScopeRep() && !TemplateTypeTy) { 1095 // Look for a member, first. 1096 FieldDecl *Member = 0; 1097 DeclContext::lookup_result Result 1098 = ClassDecl->lookup(MemberOrBase); 1099 if (Result.first != Result.second) 1100 Member = dyn_cast<FieldDecl>(*Result.first); 1101 1102 // FIXME: Handle members of an anonymous union. 1103 1104 if (Member) 1105 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1106 LParenLoc, RParenLoc); 1107 } 1108 // It didn't name a member, so see if it names a class. 1109 QualType BaseType; 1110 TypeSourceInfo *TInfo = 0; 1111 1112 if (TemplateTypeTy) { 1113 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1114 } else { 1115 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1116 LookupParsedName(R, S, &SS); 1117 1118 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1119 if (!TyD) { 1120 if (R.isAmbiguous()) return true; 1121 1122 // We don't want access-control diagnostics here. 1123 R.suppressDiagnostics(); 1124 1125 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1126 bool NotUnknownSpecialization = false; 1127 DeclContext *DC = computeDeclContext(SS, false); 1128 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1129 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1130 1131 if (!NotUnknownSpecialization) { 1132 // When the scope specifier can refer to a member of an unknown 1133 // specialization, we take it as a type name. 1134 BaseType = CheckTypenameType(ETK_None, 1135 (NestedNameSpecifier *)SS.getScopeRep(), 1136 *MemberOrBase, SourceLocation(), 1137 SS.getRange(), IdLoc); 1138 if (BaseType.isNull()) 1139 return true; 1140 1141 R.clear(); 1142 R.setLookupName(MemberOrBase); 1143 } 1144 } 1145 1146 // If no results were found, try to correct typos. 1147 if (R.empty() && BaseType.isNull() && 1148 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1149 R.isSingleResult()) { 1150 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1151 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1152 // We have found a non-static data member with a similar 1153 // name to what was typed; complain and initialize that 1154 // member. 1155 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1156 << MemberOrBase << true << R.getLookupName() 1157 << FixItHint::CreateReplacement(R.getNameLoc(), 1158 R.getLookupName().getAsString()); 1159 Diag(Member->getLocation(), diag::note_previous_decl) 1160 << Member->getDeclName(); 1161 1162 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1163 LParenLoc, RParenLoc); 1164 } 1165 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1166 const CXXBaseSpecifier *DirectBaseSpec; 1167 const CXXBaseSpecifier *VirtualBaseSpec; 1168 if (FindBaseInitializer(*this, ClassDecl, 1169 Context.getTypeDeclType(Type), 1170 DirectBaseSpec, VirtualBaseSpec)) { 1171 // We have found a direct or virtual base class with a 1172 // similar name to what was typed; complain and initialize 1173 // that base class. 1174 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1175 << MemberOrBase << false << R.getLookupName() 1176 << FixItHint::CreateReplacement(R.getNameLoc(), 1177 R.getLookupName().getAsString()); 1178 1179 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1180 : VirtualBaseSpec; 1181 Diag(BaseSpec->getSourceRange().getBegin(), 1182 diag::note_base_class_specified_here) 1183 << BaseSpec->getType() 1184 << BaseSpec->getSourceRange(); 1185 1186 TyD = Type; 1187 } 1188 } 1189 } 1190 1191 if (!TyD && BaseType.isNull()) { 1192 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1193 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1194 return true; 1195 } 1196 } 1197 1198 if (BaseType.isNull()) { 1199 BaseType = Context.getTypeDeclType(TyD); 1200 if (SS.isSet()) { 1201 NestedNameSpecifier *Qualifier = 1202 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1203 1204 // FIXME: preserve source range information 1205 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1206 } 1207 } 1208 } 1209 1210 if (!TInfo) 1211 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1212 1213 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1214 LParenLoc, RParenLoc, ClassDecl); 1215} 1216 1217/// Checks an initializer expression for use of uninitialized fields, such as 1218/// containing the field that is being initialized. Returns true if there is an 1219/// uninitialized field was used an updates the SourceLocation parameter; false 1220/// otherwise. 1221static bool InitExprContainsUninitializedFields(const Stmt *S, 1222 const FieldDecl *LhsField, 1223 SourceLocation *L) { 1224 if (isa<CallExpr>(S)) { 1225 // Do not descend into function calls or constructors, as the use 1226 // of an uninitialized field may be valid. One would have to inspect 1227 // the contents of the function/ctor to determine if it is safe or not. 1228 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1229 // may be safe, depending on what the function/ctor does. 1230 return false; 1231 } 1232 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1233 const NamedDecl *RhsField = ME->getMemberDecl(); 1234 if (RhsField == LhsField) { 1235 // Initializing a field with itself. Throw a warning. 1236 // But wait; there are exceptions! 1237 // Exception #1: The field may not belong to this record. 1238 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1239 const Expr *base = ME->getBase(); 1240 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1241 // Even though the field matches, it does not belong to this record. 1242 return false; 1243 } 1244 // None of the exceptions triggered; return true to indicate an 1245 // uninitialized field was used. 1246 *L = ME->getMemberLoc(); 1247 return true; 1248 } 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 if (Member->getType()->isDependentType() || HasDependentArg) { 1289 // Can't check initialization for a member of dependent type or when 1290 // any of the arguments are type-dependent expressions. 1291 Expr *Init 1292 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1293 RParenLoc); 1294 1295 // Erase any temporaries within this evaluation context; we're not 1296 // going to track them in the AST, since we'll be rebuilding the 1297 // ASTs during template instantiation. 1298 ExprTemporaries.erase( 1299 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1300 ExprTemporaries.end()); 1301 1302 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1303 LParenLoc, 1304 Init, 1305 RParenLoc); 1306 1307 } 1308 1309 if (Member->isInvalidDecl()) 1310 return true; 1311 1312 // Initialize the member. 1313 InitializedEntity MemberEntity = 1314 InitializedEntity::InitializeMember(Member, 0); 1315 InitializationKind Kind = 1316 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1317 1318 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1319 1320 OwningExprResult MemberInit = 1321 InitSeq.Perform(*this, MemberEntity, Kind, 1322 MultiExprArg(*this, Args, NumArgs), 0); 1323 if (MemberInit.isInvalid()) 1324 return true; 1325 1326 // C++0x [class.base.init]p7: 1327 // The initialization of each base and member constitutes a 1328 // full-expression. 1329 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1330 if (MemberInit.isInvalid()) 1331 return true; 1332 1333 // If we are in a dependent context, template instantiation will 1334 // perform this type-checking again. Just save the arguments that we 1335 // received in a ParenListExpr. 1336 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1337 // of the information that we have about the member 1338 // initializer. However, deconstructing the ASTs is a dicey process, 1339 // and this approach is far more likely to get the corner cases right. 1340 if (CurContext->isDependentContext()) { 1341 // Bump the reference count of all of the arguments. 1342 for (unsigned I = 0; I != NumArgs; ++I) 1343 Args[I]->Retain(); 1344 1345 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1346 RParenLoc); 1347 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1348 LParenLoc, 1349 Init, 1350 RParenLoc); 1351 } 1352 1353 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1354 LParenLoc, 1355 MemberInit.get(), 1356 RParenLoc); 1357} 1358 1359Sema::MemInitResult 1360Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1361 Expr **Args, unsigned NumArgs, 1362 SourceLocation LParenLoc, SourceLocation RParenLoc, 1363 CXXRecordDecl *ClassDecl) { 1364 bool HasDependentArg = false; 1365 for (unsigned i = 0; i < NumArgs; i++) 1366 HasDependentArg |= Args[i]->isTypeDependent(); 1367 1368 SourceLocation BaseLoc 1369 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1370 1371 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1372 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1373 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1374 1375 // C++ [class.base.init]p2: 1376 // [...] Unless the mem-initializer-id names a nonstatic data 1377 // member of the constructor’s class or a direct or virtual base 1378 // of that class, the mem-initializer is ill-formed. A 1379 // mem-initializer-list can initialize a base class using any 1380 // name that denotes that base class type. 1381 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1382 1383 // Check for direct and virtual base classes. 1384 const CXXBaseSpecifier *DirectBaseSpec = 0; 1385 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1386 if (!Dependent) { 1387 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1388 VirtualBaseSpec); 1389 1390 // C++ [base.class.init]p2: 1391 // Unless the mem-initializer-id names a nonstatic data member of the 1392 // constructor's class or a direct or virtual base of that class, the 1393 // mem-initializer is ill-formed. 1394 if (!DirectBaseSpec && !VirtualBaseSpec) { 1395 // If the class has any dependent bases, then it's possible that 1396 // one of those types will resolve to the same type as 1397 // BaseType. Therefore, just treat this as a dependent base 1398 // class initialization. FIXME: Should we try to check the 1399 // initialization anyway? It seems odd. 1400 if (ClassDecl->hasAnyDependentBases()) 1401 Dependent = true; 1402 else 1403 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1404 << BaseType << Context.getTypeDeclType(ClassDecl) 1405 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1406 } 1407 } 1408 1409 if (Dependent) { 1410 // Can't check initialization for a base of dependent type or when 1411 // any of the arguments are type-dependent expressions. 1412 OwningExprResult BaseInit 1413 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1414 RParenLoc)); 1415 1416 // Erase any temporaries within this evaluation context; we're not 1417 // going to track them in the AST, since we'll be rebuilding the 1418 // ASTs during template instantiation. 1419 ExprTemporaries.erase( 1420 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1421 ExprTemporaries.end()); 1422 1423 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1424 /*IsVirtual=*/false, 1425 LParenLoc, 1426 BaseInit.takeAs<Expr>(), 1427 RParenLoc); 1428 } 1429 1430 // C++ [base.class.init]p2: 1431 // If a mem-initializer-id is ambiguous because it designates both 1432 // a direct non-virtual base class and an inherited virtual base 1433 // class, the mem-initializer is ill-formed. 1434 if (DirectBaseSpec && VirtualBaseSpec) 1435 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1436 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1437 1438 CXXBaseSpecifier *BaseSpec 1439 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1440 if (!BaseSpec) 1441 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1442 1443 // Initialize the base. 1444 InitializedEntity BaseEntity = 1445 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1446 InitializationKind Kind = 1447 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1448 1449 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1450 1451 OwningExprResult BaseInit = 1452 InitSeq.Perform(*this, BaseEntity, Kind, 1453 MultiExprArg(*this, Args, NumArgs), 0); 1454 if (BaseInit.isInvalid()) 1455 return true; 1456 1457 // C++0x [class.base.init]p7: 1458 // The initialization of each base and member constitutes a 1459 // full-expression. 1460 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1461 if (BaseInit.isInvalid()) 1462 return true; 1463 1464 // If we are in a dependent context, template instantiation will 1465 // perform this type-checking again. Just save the arguments that we 1466 // received in a ParenListExpr. 1467 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1468 // of the information that we have about the base 1469 // initializer. However, deconstructing the ASTs is a dicey process, 1470 // and this approach is far more likely to get the corner cases right. 1471 if (CurContext->isDependentContext()) { 1472 // Bump the reference count of all of the arguments. 1473 for (unsigned I = 0; I != NumArgs; ++I) 1474 Args[I]->Retain(); 1475 1476 OwningExprResult Init 1477 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1478 RParenLoc)); 1479 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1480 BaseSpec->isVirtual(), 1481 LParenLoc, 1482 Init.takeAs<Expr>(), 1483 RParenLoc); 1484 } 1485 1486 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1487 BaseSpec->isVirtual(), 1488 LParenLoc, 1489 BaseInit.takeAs<Expr>(), 1490 RParenLoc); 1491} 1492 1493/// ImplicitInitializerKind - How an implicit base or member initializer should 1494/// initialize its base or member. 1495enum ImplicitInitializerKind { 1496 IIK_Default, 1497 IIK_Copy, 1498 IIK_Move 1499}; 1500 1501static bool 1502BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1503 ImplicitInitializerKind ImplicitInitKind, 1504 CXXBaseSpecifier *BaseSpec, 1505 bool IsInheritedVirtualBase, 1506 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1507 InitializedEntity InitEntity 1508 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1509 IsInheritedVirtualBase); 1510 1511 Sema::OwningExprResult BaseInit; 1512 1513 switch (ImplicitInitKind) { 1514 case IIK_Default: { 1515 InitializationKind InitKind 1516 = InitializationKind::CreateDefault(Constructor->getLocation()); 1517 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1518 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1519 Sema::MultiExprArg(SemaRef, 0, 0)); 1520 break; 1521 } 1522 1523 case IIK_Copy: { 1524 ParmVarDecl *Param = Constructor->getParamDecl(0); 1525 QualType ParamType = Param->getType().getNonReferenceType(); 1526 1527 Expr *CopyCtorArg = 1528 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1529 Constructor->getLocation(), ParamType, 0); 1530 1531 // Cast to the base class to avoid ambiguities. 1532 QualType ArgTy = 1533 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1534 ParamType.getQualifiers()); 1535 1536 CXXCastPath BasePath; 1537 BasePath.push_back(BaseSpec); 1538 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1539 CastExpr::CK_UncheckedDerivedToBase, 1540 ImplicitCastExpr::LValue, &BasePath); 1541 1542 InitializationKind InitKind 1543 = InitializationKind::CreateDirect(Constructor->getLocation(), 1544 SourceLocation(), SourceLocation()); 1545 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1546 &CopyCtorArg, 1); 1547 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1548 Sema::MultiExprArg(SemaRef, 1549 &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 Sema::OwningExprResult 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 VarDecl::None, VarDecl::None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 Sema::OwningExprResult 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 Sema::OwningExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 Sema::MultiExprArg(SemaRef, &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 Sema::OwningExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1699 Sema::MultiExprArg(SemaRef, 0, 0)); 1700 if (MemberInit.isInvalid()) 1701 return true; 1702 1703 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1704 if (MemberInit.isInvalid()) 1705 return true; 1706 1707 CXXMemberInit = 1708 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1709 Field, Loc, Loc, 1710 MemberInit.get(), 1711 Loc); 1712 return false; 1713 } 1714 1715 if (FieldBaseElementType->isReferenceType()) { 1716 SemaRef.Diag(Constructor->getLocation(), 1717 diag::err_uninitialized_member_in_ctor) 1718 << (int)Constructor->isImplicit() 1719 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1720 << 0 << Field->getDeclName(); 1721 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1722 return true; 1723 } 1724 1725 if (FieldBaseElementType.isConstQualified()) { 1726 SemaRef.Diag(Constructor->getLocation(), 1727 diag::err_uninitialized_member_in_ctor) 1728 << (int)Constructor->isImplicit() 1729 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1730 << 1 << Field->getDeclName(); 1731 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1732 return true; 1733 } 1734 1735 // Nothing to initialize. 1736 CXXMemberInit = 0; 1737 return false; 1738} 1739 1740namespace { 1741struct BaseAndFieldInfo { 1742 Sema &S; 1743 CXXConstructorDecl *Ctor; 1744 bool AnyErrorsInInits; 1745 ImplicitInitializerKind IIK; 1746 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1747 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1748 1749 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1750 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1751 // FIXME: Handle implicit move constructors. 1752 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1753 IIK = IIK_Copy; 1754 else 1755 IIK = IIK_Default; 1756 } 1757}; 1758} 1759 1760static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1761 FieldDecl *Top, FieldDecl *Field, 1762 CXXBaseOrMemberInitializer *Init) { 1763 // If the member doesn't need to be initialized, Init will still be null. 1764 if (!Init) 1765 return; 1766 1767 Info.AllToInit.push_back(Init); 1768 if (Field != Top) { 1769 Init->setMember(Top); 1770 Init->setAnonUnionMember(Field); 1771 } 1772} 1773 1774static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1775 FieldDecl *Top, FieldDecl *Field) { 1776 1777 // Overwhelmingly common case: we have a direct initializer for this field. 1778 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1779 RecordFieldInitializer(Info, Top, Field, Init); 1780 return false; 1781 } 1782 1783 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1784 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1785 assert(FieldClassType && "anonymous struct/union without record type"); 1786 CXXRecordDecl *FieldClassDecl 1787 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1788 1789 // Even though union members never have non-trivial default 1790 // constructions in C++03, we still build member initializers for aggregate 1791 // record types which can be union members, and C++0x allows non-trivial 1792 // default constructors for union members, so we ensure that only one 1793 // member is initialized for these. 1794 if (FieldClassDecl->isUnion()) { 1795 // First check for an explicit initializer for one field. 1796 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1797 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1798 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1799 RecordFieldInitializer(Info, Top, *FA, Init); 1800 1801 // Once we've initialized a field of an anonymous union, the union 1802 // field in the class is also initialized, so exit immediately. 1803 return false; 1804 } else if ((*FA)->isAnonymousStructOrUnion()) { 1805 if (CollectFieldInitializer(Info, Top, *FA)) 1806 return true; 1807 } 1808 } 1809 1810 // Fallthrough and construct a default initializer for the union as 1811 // a whole, which can call its default constructor if such a thing exists 1812 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1813 // behavior going forward with C++0x, when anonymous unions there are 1814 // finalized, we should revisit this. 1815 } else { 1816 // For structs, we simply descend through to initialize all members where 1817 // necessary. 1818 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1819 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1820 if (CollectFieldInitializer(Info, Top, *FA)) 1821 return true; 1822 } 1823 } 1824 } 1825 1826 // Don't try to build an implicit initializer if there were semantic 1827 // errors in any of the initializers (and therefore we might be 1828 // missing some that the user actually wrote). 1829 if (Info.AnyErrorsInInits) 1830 return false; 1831 1832 CXXBaseOrMemberInitializer *Init = 0; 1833 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1834 return true; 1835 1836 RecordFieldInitializer(Info, Top, Field, Init); 1837 return false; 1838} 1839 1840bool 1841Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1842 CXXBaseOrMemberInitializer **Initializers, 1843 unsigned NumInitializers, 1844 bool AnyErrors) { 1845 if (Constructor->getDeclContext()->isDependentContext()) { 1846 // Just store the initializers as written, they will be checked during 1847 // instantiation. 1848 if (NumInitializers > 0) { 1849 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1850 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1851 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1852 memcpy(baseOrMemberInitializers, Initializers, 1853 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1854 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1855 } 1856 1857 return false; 1858 } 1859 1860 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1861 1862 // We need to build the initializer AST according to order of construction 1863 // and not what user specified in the Initializers list. 1864 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1865 if (!ClassDecl) 1866 return true; 1867 1868 bool HadError = false; 1869 1870 for (unsigned i = 0; i < NumInitializers; i++) { 1871 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1872 1873 if (Member->isBaseInitializer()) 1874 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1875 else 1876 Info.AllBaseFields[Member->getMember()] = Member; 1877 } 1878 1879 // Keep track of the direct virtual bases. 1880 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1881 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1882 E = ClassDecl->bases_end(); I != E; ++I) { 1883 if (I->isVirtual()) 1884 DirectVBases.insert(I); 1885 } 1886 1887 // Push virtual bases before others. 1888 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1889 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1890 1891 if (CXXBaseOrMemberInitializer *Value 1892 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1893 Info.AllToInit.push_back(Value); 1894 } else if (!AnyErrors) { 1895 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1896 CXXBaseOrMemberInitializer *CXXBaseInit; 1897 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1898 VBase, IsInheritedVirtualBase, 1899 CXXBaseInit)) { 1900 HadError = true; 1901 continue; 1902 } 1903 1904 Info.AllToInit.push_back(CXXBaseInit); 1905 } 1906 } 1907 1908 // Non-virtual bases. 1909 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1910 E = ClassDecl->bases_end(); Base != E; ++Base) { 1911 // Virtuals are in the virtual base list and already constructed. 1912 if (Base->isVirtual()) 1913 continue; 1914 1915 if (CXXBaseOrMemberInitializer *Value 1916 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1917 Info.AllToInit.push_back(Value); 1918 } else if (!AnyErrors) { 1919 CXXBaseOrMemberInitializer *CXXBaseInit; 1920 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1921 Base, /*IsInheritedVirtualBase=*/false, 1922 CXXBaseInit)) { 1923 HadError = true; 1924 continue; 1925 } 1926 1927 Info.AllToInit.push_back(CXXBaseInit); 1928 } 1929 } 1930 1931 // Fields. 1932 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1933 E = ClassDecl->field_end(); Field != E; ++Field) { 1934 if ((*Field)->getType()->isIncompleteArrayType()) { 1935 assert(ClassDecl->hasFlexibleArrayMember() && 1936 "Incomplete array type is not valid"); 1937 continue; 1938 } 1939 if (CollectFieldInitializer(Info, *Field, *Field)) 1940 HadError = true; 1941 } 1942 1943 NumInitializers = Info.AllToInit.size(); 1944 if (NumInitializers > 0) { 1945 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1946 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1947 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1948 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1949 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1950 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1951 1952 // Constructors implicitly reference the base and member 1953 // destructors. 1954 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1955 Constructor->getParent()); 1956 } 1957 1958 return HadError; 1959} 1960 1961static void *GetKeyForTopLevelField(FieldDecl *Field) { 1962 // For anonymous unions, use the class declaration as the key. 1963 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1964 if (RT->getDecl()->isAnonymousStructOrUnion()) 1965 return static_cast<void *>(RT->getDecl()); 1966 } 1967 return static_cast<void *>(Field); 1968} 1969 1970static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1971 return Context.getCanonicalType(BaseType).getTypePtr(); 1972} 1973 1974static void *GetKeyForMember(ASTContext &Context, 1975 CXXBaseOrMemberInitializer *Member, 1976 bool MemberMaybeAnon = false) { 1977 if (!Member->isMemberInitializer()) 1978 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1979 1980 // For fields injected into the class via declaration of an anonymous union, 1981 // use its anonymous union class declaration as the unique key. 1982 FieldDecl *Field = Member->getMember(); 1983 1984 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1985 // data member of the class. Data member used in the initializer list is 1986 // in AnonUnionMember field. 1987 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1988 Field = Member->getAnonUnionMember(); 1989 1990 // If the field is a member of an anonymous struct or union, our key 1991 // is the anonymous record decl that's a direct child of the class. 1992 RecordDecl *RD = Field->getParent(); 1993 if (RD->isAnonymousStructOrUnion()) { 1994 while (true) { 1995 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1996 if (Parent->isAnonymousStructOrUnion()) 1997 RD = Parent; 1998 else 1999 break; 2000 } 2001 2002 return static_cast<void *>(RD); 2003 } 2004 2005 return static_cast<void *>(Field); 2006} 2007 2008static void 2009DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2010 const CXXConstructorDecl *Constructor, 2011 CXXBaseOrMemberInitializer **Inits, 2012 unsigned NumInits) { 2013 if (Constructor->getDeclContext()->isDependentContext()) 2014 return; 2015 2016 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2017 == Diagnostic::Ignored) 2018 return; 2019 2020 // Build the list of bases and members in the order that they'll 2021 // actually be initialized. The explicit initializers should be in 2022 // this same order but may be missing things. 2023 llvm::SmallVector<const void*, 32> IdealInitKeys; 2024 2025 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2026 2027 // 1. Virtual bases. 2028 for (CXXRecordDecl::base_class_const_iterator VBase = 2029 ClassDecl->vbases_begin(), 2030 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2031 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2032 2033 // 2. Non-virtual bases. 2034 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2035 E = ClassDecl->bases_end(); Base != E; ++Base) { 2036 if (Base->isVirtual()) 2037 continue; 2038 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2039 } 2040 2041 // 3. Direct fields. 2042 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2043 E = ClassDecl->field_end(); Field != E; ++Field) 2044 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2045 2046 unsigned NumIdealInits = IdealInitKeys.size(); 2047 unsigned IdealIndex = 0; 2048 2049 CXXBaseOrMemberInitializer *PrevInit = 0; 2050 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2051 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2052 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2053 2054 // Scan forward to try to find this initializer in the idealized 2055 // initializers list. 2056 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2057 if (InitKey == IdealInitKeys[IdealIndex]) 2058 break; 2059 2060 // If we didn't find this initializer, it must be because we 2061 // scanned past it on a previous iteration. That can only 2062 // happen if we're out of order; emit a warning. 2063 if (IdealIndex == NumIdealInits && PrevInit) { 2064 Sema::SemaDiagnosticBuilder D = 2065 SemaRef.Diag(PrevInit->getSourceLocation(), 2066 diag::warn_initializer_out_of_order); 2067 2068 if (PrevInit->isMemberInitializer()) 2069 D << 0 << PrevInit->getMember()->getDeclName(); 2070 else 2071 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2072 2073 if (Init->isMemberInitializer()) 2074 D << 0 << Init->getMember()->getDeclName(); 2075 else 2076 D << 1 << Init->getBaseClassInfo()->getType(); 2077 2078 // Move back to the initializer's location in the ideal list. 2079 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2080 if (InitKey == IdealInitKeys[IdealIndex]) 2081 break; 2082 2083 assert(IdealIndex != NumIdealInits && 2084 "initializer not found in initializer list"); 2085 } 2086 2087 PrevInit = Init; 2088 } 2089} 2090 2091namespace { 2092bool CheckRedundantInit(Sema &S, 2093 CXXBaseOrMemberInitializer *Init, 2094 CXXBaseOrMemberInitializer *&PrevInit) { 2095 if (!PrevInit) { 2096 PrevInit = Init; 2097 return false; 2098 } 2099 2100 if (FieldDecl *Field = Init->getMember()) 2101 S.Diag(Init->getSourceLocation(), 2102 diag::err_multiple_mem_initialization) 2103 << Field->getDeclName() 2104 << Init->getSourceRange(); 2105 else { 2106 Type *BaseClass = Init->getBaseClass(); 2107 assert(BaseClass && "neither field nor base"); 2108 S.Diag(Init->getSourceLocation(), 2109 diag::err_multiple_base_initialization) 2110 << QualType(BaseClass, 0) 2111 << Init->getSourceRange(); 2112 } 2113 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2114 << 0 << PrevInit->getSourceRange(); 2115 2116 return true; 2117} 2118 2119typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2120typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2121 2122bool CheckRedundantUnionInit(Sema &S, 2123 CXXBaseOrMemberInitializer *Init, 2124 RedundantUnionMap &Unions) { 2125 FieldDecl *Field = Init->getMember(); 2126 RecordDecl *Parent = Field->getParent(); 2127 if (!Parent->isAnonymousStructOrUnion()) 2128 return false; 2129 2130 NamedDecl *Child = Field; 2131 do { 2132 if (Parent->isUnion()) { 2133 UnionEntry &En = Unions[Parent]; 2134 if (En.first && En.first != Child) { 2135 S.Diag(Init->getSourceLocation(), 2136 diag::err_multiple_mem_union_initialization) 2137 << Field->getDeclName() 2138 << Init->getSourceRange(); 2139 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2140 << 0 << En.second->getSourceRange(); 2141 return true; 2142 } else if (!En.first) { 2143 En.first = Child; 2144 En.second = Init; 2145 } 2146 } 2147 2148 Child = Parent; 2149 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2150 } while (Parent->isAnonymousStructOrUnion()); 2151 2152 return false; 2153} 2154} 2155 2156/// ActOnMemInitializers - Handle the member initializers for a constructor. 2157void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2158 SourceLocation ColonLoc, 2159 MemInitTy **meminits, unsigned NumMemInits, 2160 bool AnyErrors) { 2161 if (!ConstructorDecl) 2162 return; 2163 2164 AdjustDeclIfTemplate(ConstructorDecl); 2165 2166 CXXConstructorDecl *Constructor 2167 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2168 2169 if (!Constructor) { 2170 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2171 return; 2172 } 2173 2174 CXXBaseOrMemberInitializer **MemInits = 2175 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2176 2177 // Mapping for the duplicate initializers check. 2178 // For member initializers, this is keyed with a FieldDecl*. 2179 // For base initializers, this is keyed with a Type*. 2180 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2181 2182 // Mapping for the inconsistent anonymous-union initializers check. 2183 RedundantUnionMap MemberUnions; 2184 2185 bool HadError = false; 2186 for (unsigned i = 0; i < NumMemInits; i++) { 2187 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2188 2189 // Set the source order index. 2190 Init->setSourceOrder(i); 2191 2192 if (Init->isMemberInitializer()) { 2193 FieldDecl *Field = Init->getMember(); 2194 if (CheckRedundantInit(*this, Init, Members[Field]) || 2195 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2196 HadError = true; 2197 } else { 2198 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2199 if (CheckRedundantInit(*this, Init, Members[Key])) 2200 HadError = true; 2201 } 2202 } 2203 2204 if (HadError) 2205 return; 2206 2207 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2208 2209 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2210} 2211 2212void 2213Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2214 CXXRecordDecl *ClassDecl) { 2215 // Ignore dependent contexts. 2216 if (ClassDecl->isDependentContext()) 2217 return; 2218 2219 // FIXME: all the access-control diagnostics are positioned on the 2220 // field/base declaration. That's probably good; that said, the 2221 // user might reasonably want to know why the destructor is being 2222 // emitted, and we currently don't say. 2223 2224 // Non-static data members. 2225 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2226 E = ClassDecl->field_end(); I != E; ++I) { 2227 FieldDecl *Field = *I; 2228 if (Field->isInvalidDecl()) 2229 continue; 2230 QualType FieldType = Context.getBaseElementType(Field->getType()); 2231 2232 const RecordType* RT = FieldType->getAs<RecordType>(); 2233 if (!RT) 2234 continue; 2235 2236 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2237 if (FieldClassDecl->hasTrivialDestructor()) 2238 continue; 2239 2240 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2241 CheckDestructorAccess(Field->getLocation(), Dtor, 2242 PDiag(diag::err_access_dtor_field) 2243 << Field->getDeclName() 2244 << FieldType); 2245 2246 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2247 } 2248 2249 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2250 2251 // Bases. 2252 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2253 E = ClassDecl->bases_end(); Base != E; ++Base) { 2254 // Bases are always records in a well-formed non-dependent class. 2255 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2256 2257 // Remember direct virtual bases. 2258 if (Base->isVirtual()) 2259 DirectVirtualBases.insert(RT); 2260 2261 // Ignore trivial destructors. 2262 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2263 if (BaseClassDecl->hasTrivialDestructor()) 2264 continue; 2265 2266 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2267 2268 // FIXME: caret should be on the start of the class name 2269 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2270 PDiag(diag::err_access_dtor_base) 2271 << Base->getType() 2272 << Base->getSourceRange()); 2273 2274 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2275 } 2276 2277 // Virtual bases. 2278 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2279 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2280 2281 // Bases are always records in a well-formed non-dependent class. 2282 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2283 2284 // Ignore direct virtual bases. 2285 if (DirectVirtualBases.count(RT)) 2286 continue; 2287 2288 // Ignore trivial destructors. 2289 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2290 if (BaseClassDecl->hasTrivialDestructor()) 2291 continue; 2292 2293 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2294 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2295 PDiag(diag::err_access_dtor_vbase) 2296 << VBase->getType()); 2297 2298 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2299 } 2300} 2301 2302void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2303 if (!CDtorDecl) 2304 return; 2305 2306 if (CXXConstructorDecl *Constructor 2307 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2308 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2309} 2310 2311bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2312 unsigned DiagID, AbstractDiagSelID SelID) { 2313 if (SelID == -1) 2314 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2315 else 2316 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2317} 2318 2319bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2320 const PartialDiagnostic &PD) { 2321 if (!getLangOptions().CPlusPlus) 2322 return false; 2323 2324 if (const ArrayType *AT = Context.getAsArrayType(T)) 2325 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2326 2327 if (const PointerType *PT = T->getAs<PointerType>()) { 2328 // Find the innermost pointer type. 2329 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2330 PT = T; 2331 2332 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2333 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2334 } 2335 2336 const RecordType *RT = T->getAs<RecordType>(); 2337 if (!RT) 2338 return false; 2339 2340 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2341 2342 // We can't answer whether something is abstract until it has a 2343 // definition. If it's currently being defined, we'll walk back 2344 // over all the declarations when we have a full definition. 2345 const CXXRecordDecl *Def = RD->getDefinition(); 2346 if (!Def || Def->isBeingDefined()) 2347 return false; 2348 2349 if (!RD->isAbstract()) 2350 return false; 2351 2352 Diag(Loc, PD) << RD->getDeclName(); 2353 DiagnoseAbstractType(RD); 2354 2355 return true; 2356} 2357 2358void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2359 // Check if we've already emitted the list of pure virtual functions 2360 // for this class. 2361 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2362 return; 2363 2364 CXXFinalOverriderMap FinalOverriders; 2365 RD->getFinalOverriders(FinalOverriders); 2366 2367 // Keep a set of seen pure methods so we won't diagnose the same method 2368 // more than once. 2369 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2370 2371 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2372 MEnd = FinalOverriders.end(); 2373 M != MEnd; 2374 ++M) { 2375 for (OverridingMethods::iterator SO = M->second.begin(), 2376 SOEnd = M->second.end(); 2377 SO != SOEnd; ++SO) { 2378 // C++ [class.abstract]p4: 2379 // A class is abstract if it contains or inherits at least one 2380 // pure virtual function for which the final overrider is pure 2381 // virtual. 2382 2383 // 2384 if (SO->second.size() != 1) 2385 continue; 2386 2387 if (!SO->second.front().Method->isPure()) 2388 continue; 2389 2390 if (!SeenPureMethods.insert(SO->second.front().Method)) 2391 continue; 2392 2393 Diag(SO->second.front().Method->getLocation(), 2394 diag::note_pure_virtual_function) 2395 << SO->second.front().Method->getDeclName(); 2396 } 2397 } 2398 2399 if (!PureVirtualClassDiagSet) 2400 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2401 PureVirtualClassDiagSet->insert(RD); 2402} 2403 2404namespace { 2405struct AbstractUsageInfo { 2406 Sema &S; 2407 CXXRecordDecl *Record; 2408 CanQualType AbstractType; 2409 bool Invalid; 2410 2411 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2412 : S(S), Record(Record), 2413 AbstractType(S.Context.getCanonicalType( 2414 S.Context.getTypeDeclType(Record))), 2415 Invalid(false) {} 2416 2417 void DiagnoseAbstractType() { 2418 if (Invalid) return; 2419 S.DiagnoseAbstractType(Record); 2420 Invalid = true; 2421 } 2422 2423 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2424}; 2425 2426struct CheckAbstractUsage { 2427 AbstractUsageInfo &Info; 2428 const NamedDecl *Ctx; 2429 2430 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2431 : Info(Info), Ctx(Ctx) {} 2432 2433 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2434 switch (TL.getTypeLocClass()) { 2435#define ABSTRACT_TYPELOC(CLASS, PARENT) 2436#define TYPELOC(CLASS, PARENT) \ 2437 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2438#include "clang/AST/TypeLocNodes.def" 2439 } 2440 } 2441 2442 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2443 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2444 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2445 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2446 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2447 } 2448 } 2449 2450 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2451 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2452 } 2453 2454 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2455 // Visit the type parameters from a permissive context. 2456 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2457 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2458 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2459 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2460 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2461 // TODO: other template argument types? 2462 } 2463 } 2464 2465 // Visit pointee types from a permissive context. 2466#define CheckPolymorphic(Type) \ 2467 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2468 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2469 } 2470 CheckPolymorphic(PointerTypeLoc) 2471 CheckPolymorphic(ReferenceTypeLoc) 2472 CheckPolymorphic(MemberPointerTypeLoc) 2473 CheckPolymorphic(BlockPointerTypeLoc) 2474 2475 /// Handle all the types we haven't given a more specific 2476 /// implementation for above. 2477 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2478 // Every other kind of type that we haven't called out already 2479 // that has an inner type is either (1) sugar or (2) contains that 2480 // inner type in some way as a subobject. 2481 if (TypeLoc Next = TL.getNextTypeLoc()) 2482 return Visit(Next, Sel); 2483 2484 // If there's no inner type and we're in a permissive context, 2485 // don't diagnose. 2486 if (Sel == Sema::AbstractNone) return; 2487 2488 // Check whether the type matches the abstract type. 2489 QualType T = TL.getType(); 2490 if (T->isArrayType()) { 2491 Sel = Sema::AbstractArrayType; 2492 T = Info.S.Context.getBaseElementType(T); 2493 } 2494 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2495 if (CT != Info.AbstractType) return; 2496 2497 // It matched; do some magic. 2498 if (Sel == Sema::AbstractArrayType) { 2499 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2500 << T << TL.getSourceRange(); 2501 } else { 2502 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2503 << Sel << T << TL.getSourceRange(); 2504 } 2505 Info.DiagnoseAbstractType(); 2506 } 2507}; 2508 2509void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2510 Sema::AbstractDiagSelID Sel) { 2511 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2512} 2513 2514} 2515 2516/// Check for invalid uses of an abstract type in a method declaration. 2517static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2518 CXXMethodDecl *MD) { 2519 // No need to do the check on definitions, which require that 2520 // the return/param types be complete. 2521 if (MD->isThisDeclarationADefinition()) 2522 return; 2523 2524 // For safety's sake, just ignore it if we don't have type source 2525 // information. This should never happen for non-implicit methods, 2526 // but... 2527 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2528 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2529} 2530 2531/// Check for invalid uses of an abstract type within a class definition. 2532static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2533 CXXRecordDecl *RD) { 2534 for (CXXRecordDecl::decl_iterator 2535 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2536 Decl *D = *I; 2537 if (D->isImplicit()) continue; 2538 2539 // Methods and method templates. 2540 if (isa<CXXMethodDecl>(D)) { 2541 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2542 } else if (isa<FunctionTemplateDecl>(D)) { 2543 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2544 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2545 2546 // Fields and static variables. 2547 } else if (isa<FieldDecl>(D)) { 2548 FieldDecl *FD = cast<FieldDecl>(D); 2549 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2550 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2551 } else if (isa<VarDecl>(D)) { 2552 VarDecl *VD = cast<VarDecl>(D); 2553 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2554 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2555 2556 // Nested classes and class templates. 2557 } else if (isa<CXXRecordDecl>(D)) { 2558 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2559 } else if (isa<ClassTemplateDecl>(D)) { 2560 CheckAbstractClassUsage(Info, 2561 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2562 } 2563 } 2564} 2565 2566/// \brief Perform semantic checks on a class definition that has been 2567/// completing, introducing implicitly-declared members, checking for 2568/// abstract types, etc. 2569void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2570 if (!Record || Record->isInvalidDecl()) 2571 return; 2572 2573 if (!Record->isDependentType()) 2574 AddImplicitlyDeclaredMembersToClass(Record); 2575 2576 if (Record->isInvalidDecl()) 2577 return; 2578 2579 // Set access bits correctly on the directly-declared conversions. 2580 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2581 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2582 Convs->setAccess(I, (*I)->getAccess()); 2583 2584 // Determine whether we need to check for final overriders. We do 2585 // this either when there are virtual base classes (in which case we 2586 // may end up finding multiple final overriders for a given virtual 2587 // function) or any of the base classes is abstract (in which case 2588 // we might detect that this class is abstract). 2589 bool CheckFinalOverriders = false; 2590 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2591 !Record->isDependentType()) { 2592 if (Record->getNumVBases()) 2593 CheckFinalOverriders = true; 2594 else if (!Record->isAbstract()) { 2595 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2596 BEnd = Record->bases_end(); 2597 B != BEnd; ++B) { 2598 CXXRecordDecl *BaseDecl 2599 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2600 if (BaseDecl->isAbstract()) { 2601 CheckFinalOverriders = true; 2602 break; 2603 } 2604 } 2605 } 2606 } 2607 2608 if (CheckFinalOverriders) { 2609 CXXFinalOverriderMap FinalOverriders; 2610 Record->getFinalOverriders(FinalOverriders); 2611 2612 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2613 MEnd = FinalOverriders.end(); 2614 M != MEnd; ++M) { 2615 for (OverridingMethods::iterator SO = M->second.begin(), 2616 SOEnd = M->second.end(); 2617 SO != SOEnd; ++SO) { 2618 assert(SO->second.size() > 0 && 2619 "All virtual functions have overridding virtual functions"); 2620 if (SO->second.size() == 1) { 2621 // C++ [class.abstract]p4: 2622 // A class is abstract if it contains or inherits at least one 2623 // pure virtual function for which the final overrider is pure 2624 // virtual. 2625 if (SO->second.front().Method->isPure()) 2626 Record->setAbstract(true); 2627 continue; 2628 } 2629 2630 // C++ [class.virtual]p2: 2631 // In a derived class, if a virtual member function of a base 2632 // class subobject has more than one final overrider the 2633 // program is ill-formed. 2634 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2635 << (NamedDecl *)M->first << Record; 2636 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2637 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2638 OMEnd = SO->second.end(); 2639 OM != OMEnd; ++OM) 2640 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2641 << (NamedDecl *)M->first << OM->Method->getParent(); 2642 2643 Record->setInvalidDecl(); 2644 } 2645 } 2646 } 2647 2648 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2649 AbstractUsageInfo Info(*this, Record); 2650 CheckAbstractClassUsage(Info, Record); 2651 } 2652 2653 // If this is not an aggregate type and has no user-declared constructor, 2654 // complain about any non-static data members of reference or const scalar 2655 // type, since they will never get initializers. 2656 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2657 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2658 bool Complained = false; 2659 for (RecordDecl::field_iterator F = Record->field_begin(), 2660 FEnd = Record->field_end(); 2661 F != FEnd; ++F) { 2662 if (F->getType()->isReferenceType() || 2663 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2664 if (!Complained) { 2665 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2666 << Record->getTagKind() << Record; 2667 Complained = true; 2668 } 2669 2670 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2671 << F->getType()->isReferenceType() 2672 << F->getDeclName(); 2673 } 2674 } 2675 } 2676 2677 if (Record->isDynamicClass()) 2678 DynamicClasses.push_back(Record); 2679} 2680 2681void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2682 Decl *TagDecl, 2683 SourceLocation LBrac, 2684 SourceLocation RBrac, 2685 AttributeList *AttrList) { 2686 if (!TagDecl) 2687 return; 2688 2689 AdjustDeclIfTemplate(TagDecl); 2690 2691 ActOnFields(S, RLoc, TagDecl, 2692 // strict aliasing violation! 2693 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2694 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2695 2696 CheckCompletedCXXClass( 2697 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2698} 2699 2700namespace { 2701 /// \brief Helper class that collects exception specifications for 2702 /// implicitly-declared special member functions. 2703 class ImplicitExceptionSpecification { 2704 ASTContext &Context; 2705 bool AllowsAllExceptions; 2706 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2707 llvm::SmallVector<QualType, 4> Exceptions; 2708 2709 public: 2710 explicit ImplicitExceptionSpecification(ASTContext &Context) 2711 : Context(Context), AllowsAllExceptions(false) { } 2712 2713 /// \brief Whether the special member function should have any 2714 /// exception specification at all. 2715 bool hasExceptionSpecification() const { 2716 return !AllowsAllExceptions; 2717 } 2718 2719 /// \brief Whether the special member function should have a 2720 /// throw(...) exception specification (a Microsoft extension). 2721 bool hasAnyExceptionSpecification() const { 2722 return false; 2723 } 2724 2725 /// \brief The number of exceptions in the exception specification. 2726 unsigned size() const { return Exceptions.size(); } 2727 2728 /// \brief The set of exceptions in the exception specification. 2729 const QualType *data() const { return Exceptions.data(); } 2730 2731 /// \brief Note that 2732 void CalledDecl(CXXMethodDecl *Method) { 2733 // If we already know that we allow all exceptions, do nothing. 2734 if (AllowsAllExceptions || !Method) 2735 return; 2736 2737 const FunctionProtoType *Proto 2738 = Method->getType()->getAs<FunctionProtoType>(); 2739 2740 // If this function can throw any exceptions, make a note of that. 2741 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2742 AllowsAllExceptions = true; 2743 ExceptionsSeen.clear(); 2744 Exceptions.clear(); 2745 return; 2746 } 2747 2748 // Record the exceptions in this function's exception specification. 2749 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2750 EEnd = Proto->exception_end(); 2751 E != EEnd; ++E) 2752 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2753 Exceptions.push_back(*E); 2754 } 2755 }; 2756} 2757 2758 2759/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2760/// special functions, such as the default constructor, copy 2761/// constructor, or destructor, to the given C++ class (C++ 2762/// [special]p1). This routine can only be executed just before the 2763/// definition of the class is complete. 2764void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2765 if (!ClassDecl->hasUserDeclaredConstructor()) 2766 ++ASTContext::NumImplicitDefaultConstructors; 2767 2768 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2769 ++ASTContext::NumImplicitCopyConstructors; 2770 2771 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2772 ++ASTContext::NumImplicitCopyAssignmentOperators; 2773 2774 // If we have a dynamic class, then the copy assignment operator may be 2775 // virtual, so we have to declare it immediately. This ensures that, e.g., 2776 // it shows up in the right place in the vtable and that we diagnose 2777 // problems with the implicit exception specification. 2778 if (ClassDecl->isDynamicClass()) 2779 DeclareImplicitCopyAssignment(ClassDecl); 2780 } 2781 2782 if (!ClassDecl->hasUserDeclaredDestructor()) { 2783 ++ASTContext::NumImplicitDestructors; 2784 2785 // If we have a dynamic class, then the destructor may be virtual, so we 2786 // have to declare the destructor immediately. This ensures that, e.g., it 2787 // shows up in the right place in the vtable and that we diagnose problems 2788 // with the implicit exception specification. 2789 if (ClassDecl->isDynamicClass()) 2790 DeclareImplicitDestructor(ClassDecl); 2791 } 2792} 2793 2794void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2795 if (!D) 2796 return; 2797 2798 TemplateParameterList *Params = 0; 2799 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2800 Params = Template->getTemplateParameters(); 2801 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2802 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2803 Params = PartialSpec->getTemplateParameters(); 2804 else 2805 return; 2806 2807 for (TemplateParameterList::iterator Param = Params->begin(), 2808 ParamEnd = Params->end(); 2809 Param != ParamEnd; ++Param) { 2810 NamedDecl *Named = cast<NamedDecl>(*Param); 2811 if (Named->getDeclName()) { 2812 S->AddDecl(Named); 2813 IdResolver.AddDecl(Named); 2814 } 2815 } 2816} 2817 2818void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2819 if (!RecordD) return; 2820 AdjustDeclIfTemplate(RecordD); 2821 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2822 PushDeclContext(S, Record); 2823} 2824 2825void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2826 if (!RecordD) return; 2827 PopDeclContext(); 2828} 2829 2830/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2831/// parsing a top-level (non-nested) C++ class, and we are now 2832/// parsing those parts of the given Method declaration that could 2833/// not be parsed earlier (C++ [class.mem]p2), such as default 2834/// arguments. This action should enter the scope of the given 2835/// Method declaration as if we had just parsed the qualified method 2836/// name. However, it should not bring the parameters into scope; 2837/// that will be performed by ActOnDelayedCXXMethodParameter. 2838void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2839} 2840 2841/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2842/// C++ method declaration. We're (re-)introducing the given 2843/// function parameter into scope for use in parsing later parts of 2844/// the method declaration. For example, we could see an 2845/// ActOnParamDefaultArgument event for this parameter. 2846void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2847 if (!ParamD) 2848 return; 2849 2850 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2851 2852 // If this parameter has an unparsed default argument, clear it out 2853 // to make way for the parsed default argument. 2854 if (Param->hasUnparsedDefaultArg()) 2855 Param->setDefaultArg(0); 2856 2857 S->AddDecl(Param); 2858 if (Param->getDeclName()) 2859 IdResolver.AddDecl(Param); 2860} 2861 2862/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2863/// processing the delayed method declaration for Method. The method 2864/// declaration is now considered finished. There may be a separate 2865/// ActOnStartOfFunctionDef action later (not necessarily 2866/// immediately!) for this method, if it was also defined inside the 2867/// class body. 2868void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2869 if (!MethodD) 2870 return; 2871 2872 AdjustDeclIfTemplate(MethodD); 2873 2874 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2875 2876 // Now that we have our default arguments, check the constructor 2877 // again. It could produce additional diagnostics or affect whether 2878 // the class has implicitly-declared destructors, among other 2879 // things. 2880 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2881 CheckConstructor(Constructor); 2882 2883 // Check the default arguments, which we may have added. 2884 if (!Method->isInvalidDecl()) 2885 CheckCXXDefaultArguments(Method); 2886} 2887 2888/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2889/// the well-formedness of the constructor declarator @p D with type @p 2890/// R. If there are any errors in the declarator, this routine will 2891/// emit diagnostics and set the invalid bit to true. In any case, the type 2892/// will be updated to reflect a well-formed type for the constructor and 2893/// returned. 2894QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2895 FunctionDecl::StorageClass &SC) { 2896 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2897 2898 // C++ [class.ctor]p3: 2899 // A constructor shall not be virtual (10.3) or static (9.4). A 2900 // constructor can be invoked for a const, volatile or const 2901 // volatile object. A constructor shall not be declared const, 2902 // volatile, or const volatile (9.3.2). 2903 if (isVirtual) { 2904 if (!D.isInvalidType()) 2905 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2906 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2907 << SourceRange(D.getIdentifierLoc()); 2908 D.setInvalidType(); 2909 } 2910 if (SC == FunctionDecl::Static) { 2911 if (!D.isInvalidType()) 2912 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2913 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2914 << SourceRange(D.getIdentifierLoc()); 2915 D.setInvalidType(); 2916 SC = FunctionDecl::None; 2917 } 2918 2919 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2920 if (FTI.TypeQuals != 0) { 2921 if (FTI.TypeQuals & Qualifiers::Const) 2922 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2923 << "const" << SourceRange(D.getIdentifierLoc()); 2924 if (FTI.TypeQuals & Qualifiers::Volatile) 2925 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2926 << "volatile" << SourceRange(D.getIdentifierLoc()); 2927 if (FTI.TypeQuals & Qualifiers::Restrict) 2928 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2929 << "restrict" << SourceRange(D.getIdentifierLoc()); 2930 } 2931 2932 // Rebuild the function type "R" without any type qualifiers (in 2933 // case any of the errors above fired) and with "void" as the 2934 // return type, since constructors don't have return types. 2935 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2936 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2937 Proto->getNumArgs(), 2938 Proto->isVariadic(), 0, 2939 Proto->hasExceptionSpec(), 2940 Proto->hasAnyExceptionSpec(), 2941 Proto->getNumExceptions(), 2942 Proto->exception_begin(), 2943 Proto->getExtInfo()); 2944} 2945 2946/// CheckConstructor - Checks a fully-formed constructor for 2947/// well-formedness, issuing any diagnostics required. Returns true if 2948/// the constructor declarator is invalid. 2949void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2950 CXXRecordDecl *ClassDecl 2951 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2952 if (!ClassDecl) 2953 return Constructor->setInvalidDecl(); 2954 2955 // C++ [class.copy]p3: 2956 // A declaration of a constructor for a class X is ill-formed if 2957 // its first parameter is of type (optionally cv-qualified) X and 2958 // either there are no other parameters or else all other 2959 // parameters have default arguments. 2960 if (!Constructor->isInvalidDecl() && 2961 ((Constructor->getNumParams() == 1) || 2962 (Constructor->getNumParams() > 1 && 2963 Constructor->getParamDecl(1)->hasDefaultArg())) && 2964 Constructor->getTemplateSpecializationKind() 2965 != TSK_ImplicitInstantiation) { 2966 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2967 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2968 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2969 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2970 const char *ConstRef 2971 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2972 : " const &"; 2973 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2974 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2975 2976 // FIXME: Rather that making the constructor invalid, we should endeavor 2977 // to fix the type. 2978 Constructor->setInvalidDecl(); 2979 } 2980 } 2981 2982 // Notify the class that we've added a constructor. In principle we 2983 // don't need to do this for out-of-line declarations; in practice 2984 // we only instantiate the most recent declaration of a method, so 2985 // we have to call this for everything but friends. 2986 if (!Constructor->getFriendObjectKind()) 2987 ClassDecl->addedConstructor(Context, Constructor); 2988} 2989 2990/// CheckDestructor - Checks a fully-formed destructor definition for 2991/// well-formedness, issuing any diagnostics required. Returns true 2992/// on error. 2993bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2994 CXXRecordDecl *RD = Destructor->getParent(); 2995 2996 if (Destructor->isVirtual()) { 2997 SourceLocation Loc; 2998 2999 if (!Destructor->isImplicit()) 3000 Loc = Destructor->getLocation(); 3001 else 3002 Loc = RD->getLocation(); 3003 3004 // If we have a virtual destructor, look up the deallocation function 3005 FunctionDecl *OperatorDelete = 0; 3006 DeclarationName Name = 3007 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3008 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3009 return true; 3010 3011 MarkDeclarationReferenced(Loc, OperatorDelete); 3012 3013 Destructor->setOperatorDelete(OperatorDelete); 3014 } 3015 3016 return false; 3017} 3018 3019static inline bool 3020FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3021 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3022 FTI.ArgInfo[0].Param && 3023 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3024} 3025 3026/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3027/// the well-formednes of the destructor declarator @p D with type @p 3028/// R. If there are any errors in the declarator, this routine will 3029/// emit diagnostics and set the declarator to invalid. Even if this happens, 3030/// will be updated to reflect a well-formed type for the destructor and 3031/// returned. 3032QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3033 FunctionDecl::StorageClass& SC) { 3034 // C++ [class.dtor]p1: 3035 // [...] A typedef-name that names a class is a class-name 3036 // (7.1.3); however, a typedef-name that names a class shall not 3037 // be used as the identifier in the declarator for a destructor 3038 // declaration. 3039 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3040 if (isa<TypedefType>(DeclaratorType)) 3041 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3042 << DeclaratorType; 3043 3044 // C++ [class.dtor]p2: 3045 // A destructor is used to destroy objects of its class type. A 3046 // destructor takes no parameters, and no return type can be 3047 // specified for it (not even void). The address of a destructor 3048 // shall not be taken. A destructor shall not be static. A 3049 // destructor can be invoked for a const, volatile or const 3050 // volatile object. A destructor shall not be declared const, 3051 // volatile or const volatile (9.3.2). 3052 if (SC == FunctionDecl::Static) { 3053 if (!D.isInvalidType()) 3054 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3055 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3056 << SourceRange(D.getIdentifierLoc()) 3057 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3058 3059 SC = FunctionDecl::None; 3060 } 3061 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3062 // Destructors don't have return types, but the parser will 3063 // happily parse something like: 3064 // 3065 // class X { 3066 // float ~X(); 3067 // }; 3068 // 3069 // The return type will be eliminated later. 3070 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3071 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3072 << SourceRange(D.getIdentifierLoc()); 3073 } 3074 3075 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3076 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3077 if (FTI.TypeQuals & Qualifiers::Const) 3078 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3079 << "const" << SourceRange(D.getIdentifierLoc()); 3080 if (FTI.TypeQuals & Qualifiers::Volatile) 3081 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3082 << "volatile" << SourceRange(D.getIdentifierLoc()); 3083 if (FTI.TypeQuals & Qualifiers::Restrict) 3084 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3085 << "restrict" << SourceRange(D.getIdentifierLoc()); 3086 D.setInvalidType(); 3087 } 3088 3089 // Make sure we don't have any parameters. 3090 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3091 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3092 3093 // Delete the parameters. 3094 FTI.freeArgs(); 3095 D.setInvalidType(); 3096 } 3097 3098 // Make sure the destructor isn't variadic. 3099 if (FTI.isVariadic) { 3100 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3101 D.setInvalidType(); 3102 } 3103 3104 // Rebuild the function type "R" without any type qualifiers or 3105 // parameters (in case any of the errors above fired) and with 3106 // "void" as the return type, since destructors don't have return 3107 // types. 3108 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3109 if (!Proto) 3110 return QualType(); 3111 3112 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3113 Proto->hasExceptionSpec(), 3114 Proto->hasAnyExceptionSpec(), 3115 Proto->getNumExceptions(), 3116 Proto->exception_begin(), 3117 Proto->getExtInfo()); 3118} 3119 3120/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3121/// well-formednes of the conversion function declarator @p D with 3122/// type @p R. If there are any errors in the declarator, this routine 3123/// will emit diagnostics and return true. Otherwise, it will return 3124/// false. Either way, the type @p R will be updated to reflect a 3125/// well-formed type for the conversion operator. 3126void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3127 FunctionDecl::StorageClass& SC) { 3128 // C++ [class.conv.fct]p1: 3129 // Neither parameter types nor return type can be specified. The 3130 // type of a conversion function (8.3.5) is "function taking no 3131 // parameter returning conversion-type-id." 3132 if (SC == FunctionDecl::Static) { 3133 if (!D.isInvalidType()) 3134 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3135 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3136 << SourceRange(D.getIdentifierLoc()); 3137 D.setInvalidType(); 3138 SC = FunctionDecl::None; 3139 } 3140 3141 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3142 3143 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3144 // Conversion functions don't have return types, but the parser will 3145 // happily parse something like: 3146 // 3147 // class X { 3148 // float operator bool(); 3149 // }; 3150 // 3151 // The return type will be changed later anyway. 3152 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3153 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3154 << SourceRange(D.getIdentifierLoc()); 3155 D.setInvalidType(); 3156 } 3157 3158 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3159 3160 // Make sure we don't have any parameters. 3161 if (Proto->getNumArgs() > 0) { 3162 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3163 3164 // Delete the parameters. 3165 D.getTypeObject(0).Fun.freeArgs(); 3166 D.setInvalidType(); 3167 } else if (Proto->isVariadic()) { 3168 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3169 D.setInvalidType(); 3170 } 3171 3172 // Diagnose "&operator bool()" and other such nonsense. This 3173 // is actually a gcc extension which we don't support. 3174 if (Proto->getResultType() != ConvType) { 3175 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3176 << Proto->getResultType(); 3177 D.setInvalidType(); 3178 ConvType = Proto->getResultType(); 3179 } 3180 3181 // C++ [class.conv.fct]p4: 3182 // The conversion-type-id shall not represent a function type nor 3183 // an array type. 3184 if (ConvType->isArrayType()) { 3185 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3186 ConvType = Context.getPointerType(ConvType); 3187 D.setInvalidType(); 3188 } else if (ConvType->isFunctionType()) { 3189 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3190 ConvType = Context.getPointerType(ConvType); 3191 D.setInvalidType(); 3192 } 3193 3194 // Rebuild the function type "R" without any parameters (in case any 3195 // of the errors above fired) and with the conversion type as the 3196 // return type. 3197 if (D.isInvalidType()) { 3198 R = Context.getFunctionType(ConvType, 0, 0, false, 3199 Proto->getTypeQuals(), 3200 Proto->hasExceptionSpec(), 3201 Proto->hasAnyExceptionSpec(), 3202 Proto->getNumExceptions(), 3203 Proto->exception_begin(), 3204 Proto->getExtInfo()); 3205 } 3206 3207 // C++0x explicit conversion operators. 3208 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3209 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3210 diag::warn_explicit_conversion_functions) 3211 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3212} 3213 3214/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3215/// the declaration of the given C++ conversion function. This routine 3216/// is responsible for recording the conversion function in the C++ 3217/// class, if possible. 3218Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3219 assert(Conversion && "Expected to receive a conversion function declaration"); 3220 3221 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3222 3223 // Make sure we aren't redeclaring the conversion function. 3224 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3225 3226 // C++ [class.conv.fct]p1: 3227 // [...] A conversion function is never used to convert a 3228 // (possibly cv-qualified) object to the (possibly cv-qualified) 3229 // same object type (or a reference to it), to a (possibly 3230 // cv-qualified) base class of that type (or a reference to it), 3231 // or to (possibly cv-qualified) void. 3232 // FIXME: Suppress this warning if the conversion function ends up being a 3233 // virtual function that overrides a virtual function in a base class. 3234 QualType ClassType 3235 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3236 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3237 ConvType = ConvTypeRef->getPointeeType(); 3238 if (ConvType->isRecordType()) { 3239 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3240 if (ConvType == ClassType) 3241 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3242 << ClassType; 3243 else if (IsDerivedFrom(ClassType, ConvType)) 3244 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3245 << ClassType << ConvType; 3246 } else if (ConvType->isVoidType()) { 3247 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3248 << ClassType << ConvType; 3249 } 3250 3251 if (Conversion->getPrimaryTemplate()) { 3252 // ignore specializations 3253 } else if (Conversion->getPreviousDeclaration()) { 3254 if (FunctionTemplateDecl *ConversionTemplate 3255 = Conversion->getDescribedFunctionTemplate()) { 3256 if (ClassDecl->replaceConversion( 3257 ConversionTemplate->getPreviousDeclaration(), 3258 ConversionTemplate)) 3259 return ConversionTemplate; 3260 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3261 Conversion)) 3262 return Conversion; 3263 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3264 } else if (FunctionTemplateDecl *ConversionTemplate 3265 = Conversion->getDescribedFunctionTemplate()) 3266 ClassDecl->addConversionFunction(ConversionTemplate); 3267 else 3268 ClassDecl->addConversionFunction(Conversion); 3269 3270 return Conversion; 3271} 3272 3273//===----------------------------------------------------------------------===// 3274// Namespace Handling 3275//===----------------------------------------------------------------------===// 3276 3277/// ActOnStartNamespaceDef - This is called at the start of a namespace 3278/// definition. 3279Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3280 SourceLocation IdentLoc, 3281 IdentifierInfo *II, 3282 SourceLocation LBrace, 3283 AttributeList *AttrList) { 3284 // anonymous namespace starts at its left brace 3285 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3286 (II ? IdentLoc : LBrace) , II); 3287 Namespc->setLBracLoc(LBrace); 3288 3289 Scope *DeclRegionScope = NamespcScope->getParent(); 3290 3291 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3292 3293 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3294 PushPragmaVisibility(attr->getVisibility(), attr->getLocation()); 3295 3296 if (II) { 3297 // C++ [namespace.def]p2: 3298 // The identifier in an original-namespace-definition shall not have been 3299 // previously defined in the declarative region in which the 3300 // original-namespace-definition appears. The identifier in an 3301 // original-namespace-definition is the name of the namespace. Subsequently 3302 // in that declarative region, it is treated as an original-namespace-name. 3303 3304 NamedDecl *PrevDecl 3305 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3306 ForRedeclaration); 3307 3308 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3309 // This is an extended namespace definition. 3310 // Attach this namespace decl to the chain of extended namespace 3311 // definitions. 3312 OrigNS->setNextNamespace(Namespc); 3313 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3314 3315 // Remove the previous declaration from the scope. 3316 if (DeclRegionScope->isDeclScope(OrigNS)) { 3317 IdResolver.RemoveDecl(OrigNS); 3318 DeclRegionScope->RemoveDecl(OrigNS); 3319 } 3320 } else if (PrevDecl) { 3321 // This is an invalid name redefinition. 3322 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3323 << Namespc->getDeclName(); 3324 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3325 Namespc->setInvalidDecl(); 3326 // Continue on to push Namespc as current DeclContext and return it. 3327 } else if (II->isStr("std") && 3328 CurContext->getLookupContext()->isTranslationUnit()) { 3329 // This is the first "real" definition of the namespace "std", so update 3330 // our cache of the "std" namespace to point at this definition. 3331 if (NamespaceDecl *StdNS = getStdNamespace()) { 3332 // We had already defined a dummy namespace "std". Link this new 3333 // namespace definition to the dummy namespace "std". 3334 StdNS->setNextNamespace(Namespc); 3335 StdNS->setLocation(IdentLoc); 3336 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3337 } 3338 3339 // Make our StdNamespace cache point at the first real definition of the 3340 // "std" namespace. 3341 StdNamespace = Namespc; 3342 } 3343 3344 PushOnScopeChains(Namespc, DeclRegionScope); 3345 } else { 3346 // Anonymous namespaces. 3347 assert(Namespc->isAnonymousNamespace()); 3348 3349 // Link the anonymous namespace into its parent. 3350 NamespaceDecl *PrevDecl; 3351 DeclContext *Parent = CurContext->getLookupContext(); 3352 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3353 PrevDecl = TU->getAnonymousNamespace(); 3354 TU->setAnonymousNamespace(Namespc); 3355 } else { 3356 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3357 PrevDecl = ND->getAnonymousNamespace(); 3358 ND->setAnonymousNamespace(Namespc); 3359 } 3360 3361 // Link the anonymous namespace with its previous declaration. 3362 if (PrevDecl) { 3363 assert(PrevDecl->isAnonymousNamespace()); 3364 assert(!PrevDecl->getNextNamespace()); 3365 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3366 PrevDecl->setNextNamespace(Namespc); 3367 } 3368 3369 CurContext->addDecl(Namespc); 3370 3371 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3372 // behaves as if it were replaced by 3373 // namespace unique { /* empty body */ } 3374 // using namespace unique; 3375 // namespace unique { namespace-body } 3376 // where all occurrences of 'unique' in a translation unit are 3377 // replaced by the same identifier and this identifier differs 3378 // from all other identifiers in the entire program. 3379 3380 // We just create the namespace with an empty name and then add an 3381 // implicit using declaration, just like the standard suggests. 3382 // 3383 // CodeGen enforces the "universally unique" aspect by giving all 3384 // declarations semantically contained within an anonymous 3385 // namespace internal linkage. 3386 3387 if (!PrevDecl) { 3388 UsingDirectiveDecl* UD 3389 = UsingDirectiveDecl::Create(Context, CurContext, 3390 /* 'using' */ LBrace, 3391 /* 'namespace' */ SourceLocation(), 3392 /* qualifier */ SourceRange(), 3393 /* NNS */ NULL, 3394 /* identifier */ SourceLocation(), 3395 Namespc, 3396 /* Ancestor */ CurContext); 3397 UD->setImplicit(); 3398 CurContext->addDecl(UD); 3399 } 3400 } 3401 3402 // Although we could have an invalid decl (i.e. the namespace name is a 3403 // redefinition), push it as current DeclContext and try to continue parsing. 3404 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3405 // for the namespace has the declarations that showed up in that particular 3406 // namespace definition. 3407 PushDeclContext(NamespcScope, Namespc); 3408 return Namespc; 3409} 3410 3411/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3412/// is a namespace alias, returns the namespace it points to. 3413static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3414 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3415 return AD->getNamespace(); 3416 return dyn_cast_or_null<NamespaceDecl>(D); 3417} 3418 3419/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3420/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3421void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3422 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3423 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3424 Namespc->setRBracLoc(RBrace); 3425 PopDeclContext(); 3426 if (Namespc->hasAttr<VisibilityAttr>()) 3427 PopPragmaVisibility(); 3428} 3429 3430/// \brief Retrieve the special "std" namespace, which may require us to 3431/// implicitly define the namespace. 3432NamespaceDecl *Sema::getOrCreateStdNamespace() { 3433 if (!StdNamespace) { 3434 // The "std" namespace has not yet been defined, so build one implicitly. 3435 StdNamespace = NamespaceDecl::Create(Context, 3436 Context.getTranslationUnitDecl(), 3437 SourceLocation(), 3438 &PP.getIdentifierTable().get("std")); 3439 getStdNamespace()->setImplicit(true); 3440 } 3441 3442 return getStdNamespace(); 3443} 3444 3445Decl *Sema::ActOnUsingDirective(Scope *S, 3446 SourceLocation UsingLoc, 3447 SourceLocation NamespcLoc, 3448 CXXScopeSpec &SS, 3449 SourceLocation IdentLoc, 3450 IdentifierInfo *NamespcName, 3451 AttributeList *AttrList) { 3452 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3453 assert(NamespcName && "Invalid NamespcName."); 3454 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3455 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3456 3457 UsingDirectiveDecl *UDir = 0; 3458 NestedNameSpecifier *Qualifier = 0; 3459 if (SS.isSet()) 3460 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3461 3462 // Lookup namespace name. 3463 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3464 LookupParsedName(R, S, &SS); 3465 if (R.isAmbiguous()) 3466 return 0; 3467 3468 if (R.empty()) { 3469 // Allow "using namespace std;" or "using namespace ::std;" even if 3470 // "std" hasn't been defined yet, for GCC compatibility. 3471 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3472 NamespcName->isStr("std")) { 3473 Diag(IdentLoc, diag::ext_using_undefined_std); 3474 R.addDecl(getOrCreateStdNamespace()); 3475 R.resolveKind(); 3476 } 3477 // Otherwise, attempt typo correction. 3478 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3479 CTC_NoKeywords, 0)) { 3480 if (R.getAsSingle<NamespaceDecl>() || 3481 R.getAsSingle<NamespaceAliasDecl>()) { 3482 if (DeclContext *DC = computeDeclContext(SS, false)) 3483 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3484 << NamespcName << DC << Corrected << SS.getRange() 3485 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3486 else 3487 Diag(IdentLoc, diag::err_using_directive_suggest) 3488 << NamespcName << Corrected 3489 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3490 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3491 << Corrected; 3492 3493 NamespcName = Corrected.getAsIdentifierInfo(); 3494 } else { 3495 R.clear(); 3496 R.setLookupName(NamespcName); 3497 } 3498 } 3499 } 3500 3501 if (!R.empty()) { 3502 NamedDecl *Named = R.getFoundDecl(); 3503 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3504 && "expected namespace decl"); 3505 // C++ [namespace.udir]p1: 3506 // A using-directive specifies that the names in the nominated 3507 // namespace can be used in the scope in which the 3508 // using-directive appears after the using-directive. During 3509 // unqualified name lookup (3.4.1), the names appear as if they 3510 // were declared in the nearest enclosing namespace which 3511 // contains both the using-directive and the nominated 3512 // namespace. [Note: in this context, "contains" means "contains 3513 // directly or indirectly". ] 3514 3515 // Find enclosing context containing both using-directive and 3516 // nominated namespace. 3517 NamespaceDecl *NS = getNamespaceDecl(Named); 3518 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3519 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3520 CommonAncestor = CommonAncestor->getParent(); 3521 3522 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3523 SS.getRange(), 3524 (NestedNameSpecifier *)SS.getScopeRep(), 3525 IdentLoc, Named, CommonAncestor); 3526 PushUsingDirective(S, UDir); 3527 } else { 3528 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3529 } 3530 3531 // FIXME: We ignore attributes for now. 3532 delete AttrList; 3533 return UDir; 3534} 3535 3536void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3537 // If scope has associated entity, then using directive is at namespace 3538 // or translation unit scope. We add UsingDirectiveDecls, into 3539 // it's lookup structure. 3540 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3541 Ctx->addDecl(UDir); 3542 else 3543 // Otherwise it is block-sope. using-directives will affect lookup 3544 // only to the end of scope. 3545 S->PushUsingDirective(UDir); 3546} 3547 3548 3549Decl *Sema::ActOnUsingDeclaration(Scope *S, 3550 AccessSpecifier AS, 3551 bool HasUsingKeyword, 3552 SourceLocation UsingLoc, 3553 CXXScopeSpec &SS, 3554 UnqualifiedId &Name, 3555 AttributeList *AttrList, 3556 bool IsTypeName, 3557 SourceLocation TypenameLoc) { 3558 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3559 3560 switch (Name.getKind()) { 3561 case UnqualifiedId::IK_Identifier: 3562 case UnqualifiedId::IK_OperatorFunctionId: 3563 case UnqualifiedId::IK_LiteralOperatorId: 3564 case UnqualifiedId::IK_ConversionFunctionId: 3565 break; 3566 3567 case UnqualifiedId::IK_ConstructorName: 3568 case UnqualifiedId::IK_ConstructorTemplateId: 3569 // C++0x inherited constructors. 3570 if (getLangOptions().CPlusPlus0x) break; 3571 3572 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3573 << SS.getRange(); 3574 return 0; 3575 3576 case UnqualifiedId::IK_DestructorName: 3577 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3578 << SS.getRange(); 3579 return 0; 3580 3581 case UnqualifiedId::IK_TemplateId: 3582 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3583 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3584 return 0; 3585 } 3586 3587 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3588 DeclarationName TargetName = TargetNameInfo.getName(); 3589 if (!TargetName) 3590 return 0; 3591 3592 // Warn about using declarations. 3593 // TODO: store that the declaration was written without 'using' and 3594 // talk about access decls instead of using decls in the 3595 // diagnostics. 3596 if (!HasUsingKeyword) { 3597 UsingLoc = Name.getSourceRange().getBegin(); 3598 3599 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3600 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3601 } 3602 3603 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3604 TargetNameInfo, AttrList, 3605 /* IsInstantiation */ false, 3606 IsTypeName, TypenameLoc); 3607 if (UD) 3608 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3609 3610 return UD; 3611} 3612 3613/// \brief Determine whether a using declaration considers the given 3614/// declarations as "equivalent", e.g., if they are redeclarations of 3615/// the same entity or are both typedefs of the same type. 3616static bool 3617IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3618 bool &SuppressRedeclaration) { 3619 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3620 SuppressRedeclaration = false; 3621 return true; 3622 } 3623 3624 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3625 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3626 SuppressRedeclaration = true; 3627 return Context.hasSameType(TD1->getUnderlyingType(), 3628 TD2->getUnderlyingType()); 3629 } 3630 3631 return false; 3632} 3633 3634 3635/// Determines whether to create a using shadow decl for a particular 3636/// decl, given the set of decls existing prior to this using lookup. 3637bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3638 const LookupResult &Previous) { 3639 // Diagnose finding a decl which is not from a base class of the 3640 // current class. We do this now because there are cases where this 3641 // function will silently decide not to build a shadow decl, which 3642 // will pre-empt further diagnostics. 3643 // 3644 // We don't need to do this in C++0x because we do the check once on 3645 // the qualifier. 3646 // 3647 // FIXME: diagnose the following if we care enough: 3648 // struct A { int foo; }; 3649 // struct B : A { using A::foo; }; 3650 // template <class T> struct C : A {}; 3651 // template <class T> struct D : C<T> { using B::foo; } // <--- 3652 // This is invalid (during instantiation) in C++03 because B::foo 3653 // resolves to the using decl in B, which is not a base class of D<T>. 3654 // We can't diagnose it immediately because C<T> is an unknown 3655 // specialization. The UsingShadowDecl in D<T> then points directly 3656 // to A::foo, which will look well-formed when we instantiate. 3657 // The right solution is to not collapse the shadow-decl chain. 3658 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3659 DeclContext *OrigDC = Orig->getDeclContext(); 3660 3661 // Handle enums and anonymous structs. 3662 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3663 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3664 while (OrigRec->isAnonymousStructOrUnion()) 3665 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3666 3667 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3668 if (OrigDC == CurContext) { 3669 Diag(Using->getLocation(), 3670 diag::err_using_decl_nested_name_specifier_is_current_class) 3671 << Using->getNestedNameRange(); 3672 Diag(Orig->getLocation(), diag::note_using_decl_target); 3673 return true; 3674 } 3675 3676 Diag(Using->getNestedNameRange().getBegin(), 3677 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3678 << Using->getTargetNestedNameDecl() 3679 << cast<CXXRecordDecl>(CurContext) 3680 << Using->getNestedNameRange(); 3681 Diag(Orig->getLocation(), diag::note_using_decl_target); 3682 return true; 3683 } 3684 } 3685 3686 if (Previous.empty()) return false; 3687 3688 NamedDecl *Target = Orig; 3689 if (isa<UsingShadowDecl>(Target)) 3690 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3691 3692 // If the target happens to be one of the previous declarations, we 3693 // don't have a conflict. 3694 // 3695 // FIXME: but we might be increasing its access, in which case we 3696 // should redeclare it. 3697 NamedDecl *NonTag = 0, *Tag = 0; 3698 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3699 I != E; ++I) { 3700 NamedDecl *D = (*I)->getUnderlyingDecl(); 3701 bool Result; 3702 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3703 return Result; 3704 3705 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3706 } 3707 3708 if (Target->isFunctionOrFunctionTemplate()) { 3709 FunctionDecl *FD; 3710 if (isa<FunctionTemplateDecl>(Target)) 3711 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3712 else 3713 FD = cast<FunctionDecl>(Target); 3714 3715 NamedDecl *OldDecl = 0; 3716 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3717 case Ovl_Overload: 3718 return false; 3719 3720 case Ovl_NonFunction: 3721 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3722 break; 3723 3724 // We found a decl with the exact signature. 3725 case Ovl_Match: 3726 // If we're in a record, we want to hide the target, so we 3727 // return true (without a diagnostic) to tell the caller not to 3728 // build a shadow decl. 3729 if (CurContext->isRecord()) 3730 return true; 3731 3732 // If we're not in a record, this is an error. 3733 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3734 break; 3735 } 3736 3737 Diag(Target->getLocation(), diag::note_using_decl_target); 3738 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3739 return true; 3740 } 3741 3742 // Target is not a function. 3743 3744 if (isa<TagDecl>(Target)) { 3745 // No conflict between a tag and a non-tag. 3746 if (!Tag) return false; 3747 3748 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3749 Diag(Target->getLocation(), diag::note_using_decl_target); 3750 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3751 return true; 3752 } 3753 3754 // No conflict between a tag and a non-tag. 3755 if (!NonTag) return false; 3756 3757 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3758 Diag(Target->getLocation(), diag::note_using_decl_target); 3759 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3760 return true; 3761} 3762 3763/// Builds a shadow declaration corresponding to a 'using' declaration. 3764UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3765 UsingDecl *UD, 3766 NamedDecl *Orig) { 3767 3768 // If we resolved to another shadow declaration, just coalesce them. 3769 NamedDecl *Target = Orig; 3770 if (isa<UsingShadowDecl>(Target)) { 3771 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3772 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3773 } 3774 3775 UsingShadowDecl *Shadow 3776 = UsingShadowDecl::Create(Context, CurContext, 3777 UD->getLocation(), UD, Target); 3778 UD->addShadowDecl(Shadow); 3779 3780 if (S) 3781 PushOnScopeChains(Shadow, S); 3782 else 3783 CurContext->addDecl(Shadow); 3784 Shadow->setAccess(UD->getAccess()); 3785 3786 // Register it as a conversion if appropriate. 3787 if (Shadow->getDeclName().getNameKind() 3788 == DeclarationName::CXXConversionFunctionName) 3789 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3790 3791 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3792 Shadow->setInvalidDecl(); 3793 3794 return Shadow; 3795} 3796 3797/// Hides a using shadow declaration. This is required by the current 3798/// using-decl implementation when a resolvable using declaration in a 3799/// class is followed by a declaration which would hide or override 3800/// one or more of the using decl's targets; for example: 3801/// 3802/// struct Base { void foo(int); }; 3803/// struct Derived : Base { 3804/// using Base::foo; 3805/// void foo(int); 3806/// }; 3807/// 3808/// The governing language is C++03 [namespace.udecl]p12: 3809/// 3810/// When a using-declaration brings names from a base class into a 3811/// derived class scope, member functions in the derived class 3812/// override and/or hide member functions with the same name and 3813/// parameter types in a base class (rather than conflicting). 3814/// 3815/// There are two ways to implement this: 3816/// (1) optimistically create shadow decls when they're not hidden 3817/// by existing declarations, or 3818/// (2) don't create any shadow decls (or at least don't make them 3819/// visible) until we've fully parsed/instantiated the class. 3820/// The problem with (1) is that we might have to retroactively remove 3821/// a shadow decl, which requires several O(n) operations because the 3822/// decl structures are (very reasonably) not designed for removal. 3823/// (2) avoids this but is very fiddly and phase-dependent. 3824void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3825 if (Shadow->getDeclName().getNameKind() == 3826 DeclarationName::CXXConversionFunctionName) 3827 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3828 3829 // Remove it from the DeclContext... 3830 Shadow->getDeclContext()->removeDecl(Shadow); 3831 3832 // ...and the scope, if applicable... 3833 if (S) { 3834 S->RemoveDecl(Shadow); 3835 IdResolver.RemoveDecl(Shadow); 3836 } 3837 3838 // ...and the using decl. 3839 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3840 3841 // TODO: complain somehow if Shadow was used. It shouldn't 3842 // be possible for this to happen, because...? 3843} 3844 3845/// Builds a using declaration. 3846/// 3847/// \param IsInstantiation - Whether this call arises from an 3848/// instantiation of an unresolved using declaration. We treat 3849/// the lookup differently for these declarations. 3850NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3851 SourceLocation UsingLoc, 3852 CXXScopeSpec &SS, 3853 const DeclarationNameInfo &NameInfo, 3854 AttributeList *AttrList, 3855 bool IsInstantiation, 3856 bool IsTypeName, 3857 SourceLocation TypenameLoc) { 3858 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3859 SourceLocation IdentLoc = NameInfo.getLoc(); 3860 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3861 3862 // FIXME: We ignore attributes for now. 3863 delete AttrList; 3864 3865 if (SS.isEmpty()) { 3866 Diag(IdentLoc, diag::err_using_requires_qualname); 3867 return 0; 3868 } 3869 3870 // Do the redeclaration lookup in the current scope. 3871 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3872 ForRedeclaration); 3873 Previous.setHideTags(false); 3874 if (S) { 3875 LookupName(Previous, S); 3876 3877 // It is really dumb that we have to do this. 3878 LookupResult::Filter F = Previous.makeFilter(); 3879 while (F.hasNext()) { 3880 NamedDecl *D = F.next(); 3881 if (!isDeclInScope(D, CurContext, S)) 3882 F.erase(); 3883 } 3884 F.done(); 3885 } else { 3886 assert(IsInstantiation && "no scope in non-instantiation"); 3887 assert(CurContext->isRecord() && "scope not record in instantiation"); 3888 LookupQualifiedName(Previous, CurContext); 3889 } 3890 3891 NestedNameSpecifier *NNS = 3892 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3893 3894 // Check for invalid redeclarations. 3895 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3896 return 0; 3897 3898 // Check for bad qualifiers. 3899 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3900 return 0; 3901 3902 DeclContext *LookupContext = computeDeclContext(SS); 3903 NamedDecl *D; 3904 if (!LookupContext) { 3905 if (IsTypeName) { 3906 // FIXME: not all declaration name kinds are legal here 3907 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3908 UsingLoc, TypenameLoc, 3909 SS.getRange(), NNS, 3910 IdentLoc, NameInfo.getName()); 3911 } else { 3912 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3913 UsingLoc, SS.getRange(), 3914 NNS, NameInfo); 3915 } 3916 } else { 3917 D = UsingDecl::Create(Context, CurContext, 3918 SS.getRange(), UsingLoc, NNS, NameInfo, 3919 IsTypeName); 3920 } 3921 D->setAccess(AS); 3922 CurContext->addDecl(D); 3923 3924 if (!LookupContext) return D; 3925 UsingDecl *UD = cast<UsingDecl>(D); 3926 3927 if (RequireCompleteDeclContext(SS, LookupContext)) { 3928 UD->setInvalidDecl(); 3929 return UD; 3930 } 3931 3932 // Look up the target name. 3933 3934 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3935 3936 // Unlike most lookups, we don't always want to hide tag 3937 // declarations: tag names are visible through the using declaration 3938 // even if hidden by ordinary names, *except* in a dependent context 3939 // where it's important for the sanity of two-phase lookup. 3940 if (!IsInstantiation) 3941 R.setHideTags(false); 3942 3943 LookupQualifiedName(R, LookupContext); 3944 3945 if (R.empty()) { 3946 Diag(IdentLoc, diag::err_no_member) 3947 << NameInfo.getName() << LookupContext << SS.getRange(); 3948 UD->setInvalidDecl(); 3949 return UD; 3950 } 3951 3952 if (R.isAmbiguous()) { 3953 UD->setInvalidDecl(); 3954 return UD; 3955 } 3956 3957 if (IsTypeName) { 3958 // If we asked for a typename and got a non-type decl, error out. 3959 if (!R.getAsSingle<TypeDecl>()) { 3960 Diag(IdentLoc, diag::err_using_typename_non_type); 3961 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3962 Diag((*I)->getUnderlyingDecl()->getLocation(), 3963 diag::note_using_decl_target); 3964 UD->setInvalidDecl(); 3965 return UD; 3966 } 3967 } else { 3968 // If we asked for a non-typename and we got a type, error out, 3969 // but only if this is an instantiation of an unresolved using 3970 // decl. Otherwise just silently find the type name. 3971 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3972 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3973 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3974 UD->setInvalidDecl(); 3975 return UD; 3976 } 3977 } 3978 3979 // C++0x N2914 [namespace.udecl]p6: 3980 // A using-declaration shall not name a namespace. 3981 if (R.getAsSingle<NamespaceDecl>()) { 3982 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3983 << SS.getRange(); 3984 UD->setInvalidDecl(); 3985 return UD; 3986 } 3987 3988 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3989 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3990 BuildUsingShadowDecl(S, UD, *I); 3991 } 3992 3993 return UD; 3994} 3995 3996/// Checks that the given using declaration is not an invalid 3997/// redeclaration. Note that this is checking only for the using decl 3998/// itself, not for any ill-formedness among the UsingShadowDecls. 3999bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4000 bool isTypeName, 4001 const CXXScopeSpec &SS, 4002 SourceLocation NameLoc, 4003 const LookupResult &Prev) { 4004 // C++03 [namespace.udecl]p8: 4005 // C++0x [namespace.udecl]p10: 4006 // A using-declaration is a declaration and can therefore be used 4007 // repeatedly where (and only where) multiple declarations are 4008 // allowed. 4009 // 4010 // That's in non-member contexts. 4011 if (!CurContext->getLookupContext()->isRecord()) 4012 return false; 4013 4014 NestedNameSpecifier *Qual 4015 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4016 4017 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4018 NamedDecl *D = *I; 4019 4020 bool DTypename; 4021 NestedNameSpecifier *DQual; 4022 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4023 DTypename = UD->isTypeName(); 4024 DQual = UD->getTargetNestedNameDecl(); 4025 } else if (UnresolvedUsingValueDecl *UD 4026 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4027 DTypename = false; 4028 DQual = UD->getTargetNestedNameSpecifier(); 4029 } else if (UnresolvedUsingTypenameDecl *UD 4030 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4031 DTypename = true; 4032 DQual = UD->getTargetNestedNameSpecifier(); 4033 } else continue; 4034 4035 // using decls differ if one says 'typename' and the other doesn't. 4036 // FIXME: non-dependent using decls? 4037 if (isTypeName != DTypename) continue; 4038 4039 // using decls differ if they name different scopes (but note that 4040 // template instantiation can cause this check to trigger when it 4041 // didn't before instantiation). 4042 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4043 Context.getCanonicalNestedNameSpecifier(DQual)) 4044 continue; 4045 4046 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4047 Diag(D->getLocation(), diag::note_using_decl) << 1; 4048 return true; 4049 } 4050 4051 return false; 4052} 4053 4054 4055/// Checks that the given nested-name qualifier used in a using decl 4056/// in the current context is appropriately related to the current 4057/// scope. If an error is found, diagnoses it and returns true. 4058bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4059 const CXXScopeSpec &SS, 4060 SourceLocation NameLoc) { 4061 DeclContext *NamedContext = computeDeclContext(SS); 4062 4063 if (!CurContext->isRecord()) { 4064 // C++03 [namespace.udecl]p3: 4065 // C++0x [namespace.udecl]p8: 4066 // A using-declaration for a class member shall be a member-declaration. 4067 4068 // If we weren't able to compute a valid scope, it must be a 4069 // dependent class scope. 4070 if (!NamedContext || NamedContext->isRecord()) { 4071 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4072 << SS.getRange(); 4073 return true; 4074 } 4075 4076 // Otherwise, everything is known to be fine. 4077 return false; 4078 } 4079 4080 // The current scope is a record. 4081 4082 // If the named context is dependent, we can't decide much. 4083 if (!NamedContext) { 4084 // FIXME: in C++0x, we can diagnose if we can prove that the 4085 // nested-name-specifier does not refer to a base class, which is 4086 // still possible in some cases. 4087 4088 // Otherwise we have to conservatively report that things might be 4089 // okay. 4090 return false; 4091 } 4092 4093 if (!NamedContext->isRecord()) { 4094 // Ideally this would point at the last name in the specifier, 4095 // but we don't have that level of source info. 4096 Diag(SS.getRange().getBegin(), 4097 diag::err_using_decl_nested_name_specifier_is_not_class) 4098 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4099 return true; 4100 } 4101 4102 if (getLangOptions().CPlusPlus0x) { 4103 // C++0x [namespace.udecl]p3: 4104 // In a using-declaration used as a member-declaration, the 4105 // nested-name-specifier shall name a base class of the class 4106 // being defined. 4107 4108 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4109 cast<CXXRecordDecl>(NamedContext))) { 4110 if (CurContext == NamedContext) { 4111 Diag(NameLoc, 4112 diag::err_using_decl_nested_name_specifier_is_current_class) 4113 << SS.getRange(); 4114 return true; 4115 } 4116 4117 Diag(SS.getRange().getBegin(), 4118 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4119 << (NestedNameSpecifier*) SS.getScopeRep() 4120 << cast<CXXRecordDecl>(CurContext) 4121 << SS.getRange(); 4122 return true; 4123 } 4124 4125 return false; 4126 } 4127 4128 // C++03 [namespace.udecl]p4: 4129 // A using-declaration used as a member-declaration shall refer 4130 // to a member of a base class of the class being defined [etc.]. 4131 4132 // Salient point: SS doesn't have to name a base class as long as 4133 // lookup only finds members from base classes. Therefore we can 4134 // diagnose here only if we can prove that that can't happen, 4135 // i.e. if the class hierarchies provably don't intersect. 4136 4137 // TODO: it would be nice if "definitely valid" results were cached 4138 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4139 // need to be repeated. 4140 4141 struct UserData { 4142 llvm::DenseSet<const CXXRecordDecl*> Bases; 4143 4144 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4145 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4146 Data->Bases.insert(Base); 4147 return true; 4148 } 4149 4150 bool hasDependentBases(const CXXRecordDecl *Class) { 4151 return !Class->forallBases(collect, this); 4152 } 4153 4154 /// Returns true if the base is dependent or is one of the 4155 /// accumulated base classes. 4156 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4157 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4158 return !Data->Bases.count(Base); 4159 } 4160 4161 bool mightShareBases(const CXXRecordDecl *Class) { 4162 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4163 } 4164 }; 4165 4166 UserData Data; 4167 4168 // Returns false if we find a dependent base. 4169 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4170 return false; 4171 4172 // Returns false if the class has a dependent base or if it or one 4173 // of its bases is present in the base set of the current context. 4174 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4175 return false; 4176 4177 Diag(SS.getRange().getBegin(), 4178 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4179 << (NestedNameSpecifier*) SS.getScopeRep() 4180 << cast<CXXRecordDecl>(CurContext) 4181 << SS.getRange(); 4182 4183 return true; 4184} 4185 4186Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4187 SourceLocation NamespaceLoc, 4188 SourceLocation AliasLoc, 4189 IdentifierInfo *Alias, 4190 CXXScopeSpec &SS, 4191 SourceLocation IdentLoc, 4192 IdentifierInfo *Ident) { 4193 4194 // Lookup the namespace name. 4195 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4196 LookupParsedName(R, S, &SS); 4197 4198 // Check if we have a previous declaration with the same name. 4199 NamedDecl *PrevDecl 4200 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4201 ForRedeclaration); 4202 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4203 PrevDecl = 0; 4204 4205 if (PrevDecl) { 4206 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4207 // We already have an alias with the same name that points to the same 4208 // namespace, so don't create a new one. 4209 // FIXME: At some point, we'll want to create the (redundant) 4210 // declaration to maintain better source information. 4211 if (!R.isAmbiguous() && !R.empty() && 4212 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4213 return 0; 4214 } 4215 4216 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4217 diag::err_redefinition_different_kind; 4218 Diag(AliasLoc, DiagID) << Alias; 4219 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4220 return 0; 4221 } 4222 4223 if (R.isAmbiguous()) 4224 return 0; 4225 4226 if (R.empty()) { 4227 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4228 CTC_NoKeywords, 0)) { 4229 if (R.getAsSingle<NamespaceDecl>() || 4230 R.getAsSingle<NamespaceAliasDecl>()) { 4231 if (DeclContext *DC = computeDeclContext(SS, false)) 4232 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4233 << Ident << DC << Corrected << SS.getRange() 4234 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4235 else 4236 Diag(IdentLoc, diag::err_using_directive_suggest) 4237 << Ident << Corrected 4238 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4239 4240 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4241 << Corrected; 4242 4243 Ident = Corrected.getAsIdentifierInfo(); 4244 } else { 4245 R.clear(); 4246 R.setLookupName(Ident); 4247 } 4248 } 4249 4250 if (R.empty()) { 4251 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4252 return 0; 4253 } 4254 } 4255 4256 NamespaceAliasDecl *AliasDecl = 4257 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4258 Alias, SS.getRange(), 4259 (NestedNameSpecifier *)SS.getScopeRep(), 4260 IdentLoc, R.getFoundDecl()); 4261 4262 PushOnScopeChains(AliasDecl, S); 4263 return AliasDecl; 4264} 4265 4266namespace { 4267 /// \brief Scoped object used to handle the state changes required in Sema 4268 /// to implicitly define the body of a C++ member function; 4269 class ImplicitlyDefinedFunctionScope { 4270 Sema &S; 4271 DeclContext *PreviousContext; 4272 4273 public: 4274 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4275 : S(S), PreviousContext(S.CurContext) 4276 { 4277 S.CurContext = Method; 4278 S.PushFunctionScope(); 4279 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4280 } 4281 4282 ~ImplicitlyDefinedFunctionScope() { 4283 S.PopExpressionEvaluationContext(); 4284 S.PopFunctionOrBlockScope(); 4285 S.CurContext = PreviousContext; 4286 } 4287 }; 4288} 4289 4290CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4291 CXXRecordDecl *ClassDecl) { 4292 // C++ [class.ctor]p5: 4293 // A default constructor for a class X is a constructor of class X 4294 // that can be called without an argument. If there is no 4295 // user-declared constructor for class X, a default constructor is 4296 // implicitly declared. An implicitly-declared default constructor 4297 // is an inline public member of its class. 4298 assert(!ClassDecl->hasUserDeclaredConstructor() && 4299 "Should not build implicit default constructor!"); 4300 4301 // C++ [except.spec]p14: 4302 // An implicitly declared special member function (Clause 12) shall have an 4303 // exception-specification. [...] 4304 ImplicitExceptionSpecification ExceptSpec(Context); 4305 4306 // Direct base-class destructors. 4307 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4308 BEnd = ClassDecl->bases_end(); 4309 B != BEnd; ++B) { 4310 if (B->isVirtual()) // Handled below. 4311 continue; 4312 4313 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4314 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4315 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4316 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4317 else if (CXXConstructorDecl *Constructor 4318 = BaseClassDecl->getDefaultConstructor()) 4319 ExceptSpec.CalledDecl(Constructor); 4320 } 4321 } 4322 4323 // Virtual base-class destructors. 4324 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4325 BEnd = ClassDecl->vbases_end(); 4326 B != BEnd; ++B) { 4327 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4328 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4329 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4330 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4331 else if (CXXConstructorDecl *Constructor 4332 = BaseClassDecl->getDefaultConstructor()) 4333 ExceptSpec.CalledDecl(Constructor); 4334 } 4335 } 4336 4337 // Field destructors. 4338 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4339 FEnd = ClassDecl->field_end(); 4340 F != FEnd; ++F) { 4341 if (const RecordType *RecordTy 4342 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4343 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4344 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4345 ExceptSpec.CalledDecl( 4346 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4347 else if (CXXConstructorDecl *Constructor 4348 = FieldClassDecl->getDefaultConstructor()) 4349 ExceptSpec.CalledDecl(Constructor); 4350 } 4351 } 4352 4353 4354 // Create the actual constructor declaration. 4355 CanQualType ClassType 4356 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4357 DeclarationName Name 4358 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4359 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4360 CXXConstructorDecl *DefaultCon 4361 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4362 Context.getFunctionType(Context.VoidTy, 4363 0, 0, false, 0, 4364 ExceptSpec.hasExceptionSpecification(), 4365 ExceptSpec.hasAnyExceptionSpecification(), 4366 ExceptSpec.size(), 4367 ExceptSpec.data(), 4368 FunctionType::ExtInfo()), 4369 /*TInfo=*/0, 4370 /*isExplicit=*/false, 4371 /*isInline=*/true, 4372 /*isImplicitlyDeclared=*/true); 4373 DefaultCon->setAccess(AS_public); 4374 DefaultCon->setImplicit(); 4375 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4376 4377 // Note that we have declared this constructor. 4378 ClassDecl->setDeclaredDefaultConstructor(true); 4379 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4380 4381 if (Scope *S = getScopeForContext(ClassDecl)) 4382 PushOnScopeChains(DefaultCon, S, false); 4383 ClassDecl->addDecl(DefaultCon); 4384 4385 return DefaultCon; 4386} 4387 4388void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4389 CXXConstructorDecl *Constructor) { 4390 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4391 !Constructor->isUsed(false)) && 4392 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4393 4394 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4395 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4396 4397 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4398 ErrorTrap Trap(*this); 4399 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4400 Trap.hasErrorOccurred()) { 4401 Diag(CurrentLocation, diag::note_member_synthesized_at) 4402 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4403 Constructor->setInvalidDecl(); 4404 } else { 4405 Constructor->setUsed(); 4406 MarkVTableUsed(CurrentLocation, ClassDecl); 4407 } 4408} 4409 4410CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4411 // C++ [class.dtor]p2: 4412 // If a class has no user-declared destructor, a destructor is 4413 // declared implicitly. An implicitly-declared destructor is an 4414 // inline public member of its class. 4415 4416 // C++ [except.spec]p14: 4417 // An implicitly declared special member function (Clause 12) shall have 4418 // an exception-specification. 4419 ImplicitExceptionSpecification ExceptSpec(Context); 4420 4421 // Direct base-class destructors. 4422 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4423 BEnd = ClassDecl->bases_end(); 4424 B != BEnd; ++B) { 4425 if (B->isVirtual()) // Handled below. 4426 continue; 4427 4428 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4429 ExceptSpec.CalledDecl( 4430 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4431 } 4432 4433 // Virtual base-class destructors. 4434 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4435 BEnd = ClassDecl->vbases_end(); 4436 B != BEnd; ++B) { 4437 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4438 ExceptSpec.CalledDecl( 4439 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4440 } 4441 4442 // Field destructors. 4443 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4444 FEnd = ClassDecl->field_end(); 4445 F != FEnd; ++F) { 4446 if (const RecordType *RecordTy 4447 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4448 ExceptSpec.CalledDecl( 4449 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4450 } 4451 4452 // Create the actual destructor declaration. 4453 QualType Ty = Context.getFunctionType(Context.VoidTy, 4454 0, 0, false, 0, 4455 ExceptSpec.hasExceptionSpecification(), 4456 ExceptSpec.hasAnyExceptionSpecification(), 4457 ExceptSpec.size(), 4458 ExceptSpec.data(), 4459 FunctionType::ExtInfo()); 4460 4461 CanQualType ClassType 4462 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4463 DeclarationName Name 4464 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4465 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4466 CXXDestructorDecl *Destructor 4467 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4468 /*isInline=*/true, 4469 /*isImplicitlyDeclared=*/true); 4470 Destructor->setAccess(AS_public); 4471 Destructor->setImplicit(); 4472 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4473 4474 // Note that we have declared this destructor. 4475 ClassDecl->setDeclaredDestructor(true); 4476 ++ASTContext::NumImplicitDestructorsDeclared; 4477 4478 // Introduce this destructor into its scope. 4479 if (Scope *S = getScopeForContext(ClassDecl)) 4480 PushOnScopeChains(Destructor, S, false); 4481 ClassDecl->addDecl(Destructor); 4482 4483 // This could be uniqued if it ever proves significant. 4484 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4485 4486 AddOverriddenMethods(ClassDecl, Destructor); 4487 4488 return Destructor; 4489} 4490 4491void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4492 CXXDestructorDecl *Destructor) { 4493 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4494 "DefineImplicitDestructor - call it for implicit default dtor"); 4495 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4496 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4497 4498 if (Destructor->isInvalidDecl()) 4499 return; 4500 4501 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4502 4503 ErrorTrap Trap(*this); 4504 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4505 Destructor->getParent()); 4506 4507 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4508 Diag(CurrentLocation, diag::note_member_synthesized_at) 4509 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4510 4511 Destructor->setInvalidDecl(); 4512 return; 4513 } 4514 4515 Destructor->setUsed(); 4516 MarkVTableUsed(CurrentLocation, ClassDecl); 4517} 4518 4519/// \brief Builds a statement that copies the given entity from \p From to 4520/// \c To. 4521/// 4522/// This routine is used to copy the members of a class with an 4523/// implicitly-declared copy assignment operator. When the entities being 4524/// copied are arrays, this routine builds for loops to copy them. 4525/// 4526/// \param S The Sema object used for type-checking. 4527/// 4528/// \param Loc The location where the implicit copy is being generated. 4529/// 4530/// \param T The type of the expressions being copied. Both expressions must 4531/// have this type. 4532/// 4533/// \param To The expression we are copying to. 4534/// 4535/// \param From The expression we are copying from. 4536/// 4537/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4538/// Otherwise, it's a non-static member subobject. 4539/// 4540/// \param Depth Internal parameter recording the depth of the recursion. 4541/// 4542/// \returns A statement or a loop that copies the expressions. 4543static OwningStmtResult 4544BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4545 Expr *To, Expr *From, 4546 bool CopyingBaseSubobject, unsigned Depth = 0) { 4547 // C++0x [class.copy]p30: 4548 // Each subobject is assigned in the manner appropriate to its type: 4549 // 4550 // - if the subobject is of class type, the copy assignment operator 4551 // for the class is used (as if by explicit qualification; that is, 4552 // ignoring any possible virtual overriding functions in more derived 4553 // classes); 4554 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4555 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4556 4557 // Look for operator=. 4558 DeclarationName Name 4559 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4560 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4561 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4562 4563 // Filter out any result that isn't a copy-assignment operator. 4564 LookupResult::Filter F = OpLookup.makeFilter(); 4565 while (F.hasNext()) { 4566 NamedDecl *D = F.next(); 4567 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4568 if (Method->isCopyAssignmentOperator()) 4569 continue; 4570 4571 F.erase(); 4572 } 4573 F.done(); 4574 4575 // Suppress the protected check (C++ [class.protected]) for each of the 4576 // assignment operators we found. This strange dance is required when 4577 // we're assigning via a base classes's copy-assignment operator. To 4578 // ensure that we're getting the right base class subobject (without 4579 // ambiguities), we need to cast "this" to that subobject type; to 4580 // ensure that we don't go through the virtual call mechanism, we need 4581 // to qualify the operator= name with the base class (see below). However, 4582 // this means that if the base class has a protected copy assignment 4583 // operator, the protected member access check will fail. So, we 4584 // rewrite "protected" access to "public" access in this case, since we 4585 // know by construction that we're calling from a derived class. 4586 if (CopyingBaseSubobject) { 4587 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4588 L != LEnd; ++L) { 4589 if (L.getAccess() == AS_protected) 4590 L.setAccess(AS_public); 4591 } 4592 } 4593 4594 // Create the nested-name-specifier that will be used to qualify the 4595 // reference to operator=; this is required to suppress the virtual 4596 // call mechanism. 4597 CXXScopeSpec SS; 4598 SS.setRange(Loc); 4599 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4600 T.getTypePtr())); 4601 4602 // Create the reference to operator=. 4603 OwningExprResult OpEqualRef 4604 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4605 /*FirstQualifierInScope=*/0, OpLookup, 4606 /*TemplateArgs=*/0, 4607 /*SuppressQualifierCheck=*/true); 4608 if (OpEqualRef.isInvalid()) 4609 return S.StmtError(); 4610 4611 // Build the call to the assignment operator. 4612 4613 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4614 OpEqualRef.takeAs<Expr>(), 4615 Loc, &From, 1, 0, Loc); 4616 if (Call.isInvalid()) 4617 return S.StmtError(); 4618 4619 return S.Owned(Call.takeAs<Stmt>()); 4620 } 4621 4622 // - if the subobject is of scalar type, the built-in assignment 4623 // operator is used. 4624 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4625 if (!ArrayTy) { 4626 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4627 BinaryOperator::Assign, 4628 To, 4629 From); 4630 if (Assignment.isInvalid()) 4631 return S.StmtError(); 4632 4633 return S.Owned(Assignment.takeAs<Stmt>()); 4634 } 4635 4636 // - if the subobject is an array, each element is assigned, in the 4637 // manner appropriate to the element type; 4638 4639 // Construct a loop over the array bounds, e.g., 4640 // 4641 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4642 // 4643 // that will copy each of the array elements. 4644 QualType SizeType = S.Context.getSizeType(); 4645 4646 // Create the iteration variable. 4647 IdentifierInfo *IterationVarName = 0; 4648 { 4649 llvm::SmallString<8> Str; 4650 llvm::raw_svector_ostream OS(Str); 4651 OS << "__i" << Depth; 4652 IterationVarName = &S.Context.Idents.get(OS.str()); 4653 } 4654 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4655 IterationVarName, SizeType, 4656 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4657 VarDecl::None, VarDecl::None); 4658 4659 // Initialize the iteration variable to zero. 4660 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4661 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4662 4663 // Create a reference to the iteration variable; we'll use this several 4664 // times throughout. 4665 Expr *IterationVarRef 4666 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4667 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4668 4669 // Create the DeclStmt that holds the iteration variable. 4670 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4671 4672 // Create the comparison against the array bound. 4673 llvm::APInt Upper = ArrayTy->getSize(); 4674 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4675 Expr *Comparison 4676 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4677 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4678 BinaryOperator::NE, S.Context.BoolTy, Loc); 4679 4680 // Create the pre-increment of the iteration variable. 4681 Expr *Increment 4682 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4683 UnaryOperator::PreInc, 4684 SizeType, Loc); 4685 4686 // Subscript the "from" and "to" expressions with the iteration variable. 4687 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4688 IterationVarRef, Loc)); 4689 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4690 IterationVarRef, Loc)); 4691 4692 // Build the copy for an individual element of the array. 4693 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4694 ArrayTy->getElementType(), 4695 To, From, 4696 CopyingBaseSubobject, Depth+1); 4697 if (Copy.isInvalid()) 4698 return S.StmtError(); 4699 4700 // Construct the loop that copies all elements of this array. 4701 return S.ActOnForStmt(Loc, Loc, InitStmt, 4702 S.MakeFullExpr(Comparison), 4703 0, S.MakeFullExpr(Increment), 4704 Loc, Copy.take()); 4705} 4706 4707/// \brief Determine whether the given class has a copy assignment operator 4708/// that accepts a const-qualified argument. 4709static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4710 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4711 4712 if (!Class->hasDeclaredCopyAssignment()) 4713 S.DeclareImplicitCopyAssignment(Class); 4714 4715 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4716 DeclarationName OpName 4717 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4718 4719 DeclContext::lookup_const_iterator Op, OpEnd; 4720 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4721 // C++ [class.copy]p9: 4722 // A user-declared copy assignment operator is a non-static non-template 4723 // member function of class X with exactly one parameter of type X, X&, 4724 // const X&, volatile X& or const volatile X&. 4725 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4726 if (!Method) 4727 continue; 4728 4729 if (Method->isStatic()) 4730 continue; 4731 if (Method->getPrimaryTemplate()) 4732 continue; 4733 const FunctionProtoType *FnType = 4734 Method->getType()->getAs<FunctionProtoType>(); 4735 assert(FnType && "Overloaded operator has no prototype."); 4736 // Don't assert on this; an invalid decl might have been left in the AST. 4737 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4738 continue; 4739 bool AcceptsConst = true; 4740 QualType ArgType = FnType->getArgType(0); 4741 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4742 ArgType = Ref->getPointeeType(); 4743 // Is it a non-const lvalue reference? 4744 if (!ArgType.isConstQualified()) 4745 AcceptsConst = false; 4746 } 4747 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4748 continue; 4749 4750 // We have a single argument of type cv X or cv X&, i.e. we've found the 4751 // copy assignment operator. Return whether it accepts const arguments. 4752 return AcceptsConst; 4753 } 4754 assert(Class->isInvalidDecl() && 4755 "No copy assignment operator declared in valid code."); 4756 return false; 4757} 4758 4759CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4760 // Note: The following rules are largely analoguous to the copy 4761 // constructor rules. Note that virtual bases are not taken into account 4762 // for determining the argument type of the operator. Note also that 4763 // operators taking an object instead of a reference are allowed. 4764 4765 4766 // C++ [class.copy]p10: 4767 // If the class definition does not explicitly declare a copy 4768 // assignment operator, one is declared implicitly. 4769 // The implicitly-defined copy assignment operator for a class X 4770 // will have the form 4771 // 4772 // X& X::operator=(const X&) 4773 // 4774 // if 4775 bool HasConstCopyAssignment = true; 4776 4777 // -- each direct base class B of X has a copy assignment operator 4778 // whose parameter is of type const B&, const volatile B& or B, 4779 // and 4780 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4781 BaseEnd = ClassDecl->bases_end(); 4782 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4783 assert(!Base->getType()->isDependentType() && 4784 "Cannot generate implicit members for class with dependent bases."); 4785 const CXXRecordDecl *BaseClassDecl 4786 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4787 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4788 } 4789 4790 // -- for all the nonstatic data members of X that are of a class 4791 // type M (or array thereof), each such class type has a copy 4792 // assignment operator whose parameter is of type const M&, 4793 // const volatile M& or M. 4794 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4795 FieldEnd = ClassDecl->field_end(); 4796 HasConstCopyAssignment && Field != FieldEnd; 4797 ++Field) { 4798 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4799 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4800 const CXXRecordDecl *FieldClassDecl 4801 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4802 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4803 } 4804 } 4805 4806 // Otherwise, the implicitly declared copy assignment operator will 4807 // have the form 4808 // 4809 // X& X::operator=(X&) 4810 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4811 QualType RetType = Context.getLValueReferenceType(ArgType); 4812 if (HasConstCopyAssignment) 4813 ArgType = ArgType.withConst(); 4814 ArgType = Context.getLValueReferenceType(ArgType); 4815 4816 // C++ [except.spec]p14: 4817 // An implicitly declared special member function (Clause 12) shall have an 4818 // exception-specification. [...] 4819 ImplicitExceptionSpecification ExceptSpec(Context); 4820 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4821 BaseEnd = ClassDecl->bases_end(); 4822 Base != BaseEnd; ++Base) { 4823 CXXRecordDecl *BaseClassDecl 4824 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4825 4826 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4827 DeclareImplicitCopyAssignment(BaseClassDecl); 4828 4829 if (CXXMethodDecl *CopyAssign 4830 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4831 ExceptSpec.CalledDecl(CopyAssign); 4832 } 4833 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4834 FieldEnd = ClassDecl->field_end(); 4835 Field != FieldEnd; 4836 ++Field) { 4837 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4838 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4839 CXXRecordDecl *FieldClassDecl 4840 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4841 4842 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4843 DeclareImplicitCopyAssignment(FieldClassDecl); 4844 4845 if (CXXMethodDecl *CopyAssign 4846 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4847 ExceptSpec.CalledDecl(CopyAssign); 4848 } 4849 } 4850 4851 // An implicitly-declared copy assignment operator is an inline public 4852 // member of its class. 4853 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4854 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4855 CXXMethodDecl *CopyAssignment 4856 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4857 Context.getFunctionType(RetType, &ArgType, 1, 4858 false, 0, 4859 ExceptSpec.hasExceptionSpecification(), 4860 ExceptSpec.hasAnyExceptionSpecification(), 4861 ExceptSpec.size(), 4862 ExceptSpec.data(), 4863 FunctionType::ExtInfo()), 4864 /*TInfo=*/0, /*isStatic=*/false, 4865 /*StorageClassAsWritten=*/FunctionDecl::None, 4866 /*isInline=*/true); 4867 CopyAssignment->setAccess(AS_public); 4868 CopyAssignment->setImplicit(); 4869 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4870 CopyAssignment->setCopyAssignment(true); 4871 4872 // Add the parameter to the operator. 4873 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4874 ClassDecl->getLocation(), 4875 /*Id=*/0, 4876 ArgType, /*TInfo=*/0, 4877 VarDecl::None, 4878 VarDecl::None, 0); 4879 CopyAssignment->setParams(&FromParam, 1); 4880 4881 // Note that we have added this copy-assignment operator. 4882 ClassDecl->setDeclaredCopyAssignment(true); 4883 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4884 4885 if (Scope *S = getScopeForContext(ClassDecl)) 4886 PushOnScopeChains(CopyAssignment, S, false); 4887 ClassDecl->addDecl(CopyAssignment); 4888 4889 AddOverriddenMethods(ClassDecl, CopyAssignment); 4890 return CopyAssignment; 4891} 4892 4893void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4894 CXXMethodDecl *CopyAssignOperator) { 4895 assert((CopyAssignOperator->isImplicit() && 4896 CopyAssignOperator->isOverloadedOperator() && 4897 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4898 !CopyAssignOperator->isUsed(false)) && 4899 "DefineImplicitCopyAssignment called for wrong function"); 4900 4901 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4902 4903 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4904 CopyAssignOperator->setInvalidDecl(); 4905 return; 4906 } 4907 4908 CopyAssignOperator->setUsed(); 4909 4910 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4911 ErrorTrap Trap(*this); 4912 4913 // C++0x [class.copy]p30: 4914 // The implicitly-defined or explicitly-defaulted copy assignment operator 4915 // for a non-union class X performs memberwise copy assignment of its 4916 // subobjects. The direct base classes of X are assigned first, in the 4917 // order of their declaration in the base-specifier-list, and then the 4918 // immediate non-static data members of X are assigned, in the order in 4919 // which they were declared in the class definition. 4920 4921 // The statements that form the synthesized function body. 4922 ASTOwningVector<Stmt*> Statements(*this); 4923 4924 // The parameter for the "other" object, which we are copying from. 4925 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4926 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4927 QualType OtherRefType = Other->getType(); 4928 if (const LValueReferenceType *OtherRef 4929 = OtherRefType->getAs<LValueReferenceType>()) { 4930 OtherRefType = OtherRef->getPointeeType(); 4931 OtherQuals = OtherRefType.getQualifiers(); 4932 } 4933 4934 // Our location for everything implicitly-generated. 4935 SourceLocation Loc = CopyAssignOperator->getLocation(); 4936 4937 // Construct a reference to the "other" object. We'll be using this 4938 // throughout the generated ASTs. 4939 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4940 assert(OtherRef && "Reference to parameter cannot fail!"); 4941 4942 // Construct the "this" pointer. We'll be using this throughout the generated 4943 // ASTs. 4944 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4945 assert(This && "Reference to this cannot fail!"); 4946 4947 // Assign base classes. 4948 bool Invalid = false; 4949 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4950 E = ClassDecl->bases_end(); Base != E; ++Base) { 4951 // Form the assignment: 4952 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4953 QualType BaseType = Base->getType().getUnqualifiedType(); 4954 CXXRecordDecl *BaseClassDecl = 0; 4955 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4956 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4957 else { 4958 Invalid = true; 4959 continue; 4960 } 4961 4962 CXXCastPath BasePath; 4963 BasePath.push_back(Base); 4964 4965 // Construct the "from" expression, which is an implicit cast to the 4966 // appropriately-qualified base type. 4967 Expr *From = OtherRef->Retain(); 4968 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4969 CastExpr::CK_UncheckedDerivedToBase, 4970 ImplicitCastExpr::LValue, &BasePath); 4971 4972 // Dereference "this". 4973 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, This); 4974 4975 // Implicitly cast "this" to the appropriately-qualified base type. 4976 Expr *ToE = To.takeAs<Expr>(); 4977 ImpCastExprToType(ToE, 4978 Context.getCVRQualifiedType(BaseType, 4979 CopyAssignOperator->getTypeQualifiers()), 4980 CastExpr::CK_UncheckedDerivedToBase, 4981 ImplicitCastExpr::LValue, &BasePath); 4982 To = Owned(ToE); 4983 4984 // Build the copy. 4985 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4986 To.get(), From, 4987 /*CopyingBaseSubobject=*/true); 4988 if (Copy.isInvalid()) { 4989 Diag(CurrentLocation, diag::note_member_synthesized_at) 4990 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4991 CopyAssignOperator->setInvalidDecl(); 4992 return; 4993 } 4994 4995 // Success! Record the copy. 4996 Statements.push_back(Copy.takeAs<Expr>()); 4997 } 4998 4999 // \brief Reference to the __builtin_memcpy function. 5000 Expr *BuiltinMemCpyRef = 0; 5001 // \brief Reference to the __builtin_objc_memmove_collectable function. 5002 Expr *CollectableMemCpyRef = 0; 5003 5004 // Assign non-static members. 5005 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5006 FieldEnd = ClassDecl->field_end(); 5007 Field != FieldEnd; ++Field) { 5008 // Check for members of reference type; we can't copy those. 5009 if (Field->getType()->isReferenceType()) { 5010 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5011 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5012 Diag(Field->getLocation(), diag::note_declared_at); 5013 Diag(CurrentLocation, diag::note_member_synthesized_at) 5014 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5015 Invalid = true; 5016 continue; 5017 } 5018 5019 // Check for members of const-qualified, non-class type. 5020 QualType BaseType = Context.getBaseElementType(Field->getType()); 5021 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5022 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5023 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5024 Diag(Field->getLocation(), diag::note_declared_at); 5025 Diag(CurrentLocation, diag::note_member_synthesized_at) 5026 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5027 Invalid = true; 5028 continue; 5029 } 5030 5031 QualType FieldType = Field->getType().getNonReferenceType(); 5032 if (FieldType->isIncompleteArrayType()) { 5033 assert(ClassDecl->hasFlexibleArrayMember() && 5034 "Incomplete array type is not valid"); 5035 continue; 5036 } 5037 5038 // Build references to the field in the object we're copying from and to. 5039 CXXScopeSpec SS; // Intentionally empty 5040 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5041 LookupMemberName); 5042 MemberLookup.addDecl(*Field); 5043 MemberLookup.resolveKind(); 5044 OwningExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5045 Loc, /*IsArrow=*/false, 5046 SS, 0, MemberLookup, 0); 5047 OwningExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5048 Loc, /*IsArrow=*/true, 5049 SS, 0, MemberLookup, 0); 5050 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5051 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5052 5053 // If the field should be copied with __builtin_memcpy rather than via 5054 // explicit assignments, do so. This optimization only applies for arrays 5055 // of scalars and arrays of class type with trivial copy-assignment 5056 // operators. 5057 if (FieldType->isArrayType() && 5058 (!BaseType->isRecordType() || 5059 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5060 ->hasTrivialCopyAssignment())) { 5061 // Compute the size of the memory buffer to be copied. 5062 QualType SizeType = Context.getSizeType(); 5063 llvm::APInt Size(Context.getTypeSize(SizeType), 5064 Context.getTypeSizeInChars(BaseType).getQuantity()); 5065 for (const ConstantArrayType *Array 5066 = Context.getAsConstantArrayType(FieldType); 5067 Array; 5068 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5069 llvm::APInt ArraySize = Array->getSize(); 5070 ArraySize.zextOrTrunc(Size.getBitWidth()); 5071 Size *= ArraySize; 5072 } 5073 5074 // Take the address of the field references for "from" and "to". 5075 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, From.get()); 5076 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, To.get()); 5077 5078 bool NeedsCollectableMemCpy = 5079 (BaseType->isRecordType() && 5080 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5081 5082 if (NeedsCollectableMemCpy) { 5083 if (!CollectableMemCpyRef) { 5084 // Create a reference to the __builtin_objc_memmove_collectable function. 5085 LookupResult R(*this, 5086 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5087 Loc, LookupOrdinaryName); 5088 LookupName(R, TUScope, true); 5089 5090 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5091 if (!CollectableMemCpy) { 5092 // Something went horribly wrong earlier, and we will have 5093 // complained about it. 5094 Invalid = true; 5095 continue; 5096 } 5097 5098 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5099 CollectableMemCpy->getType(), 5100 Loc, 0).takeAs<Expr>(); 5101 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5102 } 5103 } 5104 // Create a reference to the __builtin_memcpy builtin function. 5105 else if (!BuiltinMemCpyRef) { 5106 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5107 LookupOrdinaryName); 5108 LookupName(R, TUScope, true); 5109 5110 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5111 if (!BuiltinMemCpy) { 5112 // Something went horribly wrong earlier, and we will have complained 5113 // about it. 5114 Invalid = true; 5115 continue; 5116 } 5117 5118 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5119 BuiltinMemCpy->getType(), 5120 Loc, 0).takeAs<Expr>(); 5121 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5122 } 5123 5124 ASTOwningVector<Expr*> CallArgs(*this); 5125 CallArgs.push_back(To.takeAs<Expr>()); 5126 CallArgs.push_back(From.takeAs<Expr>()); 5127 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5128 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5129 Commas.push_back(Loc); 5130 Commas.push_back(Loc); 5131 OwningExprResult Call = ExprError(); 5132 if (NeedsCollectableMemCpy) 5133 Call = ActOnCallExpr(/*Scope=*/0, 5134 CollectableMemCpyRef, 5135 Loc, move_arg(CallArgs), 5136 Commas.data(), Loc); 5137 else 5138 Call = ActOnCallExpr(/*Scope=*/0, 5139 BuiltinMemCpyRef, 5140 Loc, move_arg(CallArgs), 5141 Commas.data(), Loc); 5142 5143 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5144 Statements.push_back(Call.takeAs<Expr>()); 5145 continue; 5146 } 5147 5148 // Build the copy of this field. 5149 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5150 To.get(), From.get(), 5151 /*CopyingBaseSubobject=*/false); 5152 if (Copy.isInvalid()) { 5153 Diag(CurrentLocation, diag::note_member_synthesized_at) 5154 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5155 CopyAssignOperator->setInvalidDecl(); 5156 return; 5157 } 5158 5159 // Success! Record the copy. 5160 Statements.push_back(Copy.takeAs<Stmt>()); 5161 } 5162 5163 if (!Invalid) { 5164 // Add a "return *this;" 5165 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5166 This); 5167 5168 OwningStmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5169 if (Return.isInvalid()) 5170 Invalid = true; 5171 else { 5172 Statements.push_back(Return.takeAs<Stmt>()); 5173 5174 if (Trap.hasErrorOccurred()) { 5175 Diag(CurrentLocation, diag::note_member_synthesized_at) 5176 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5177 Invalid = true; 5178 } 5179 } 5180 } 5181 5182 if (Invalid) { 5183 CopyAssignOperator->setInvalidDecl(); 5184 return; 5185 } 5186 5187 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5188 /*isStmtExpr=*/false); 5189 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5190 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5191} 5192 5193CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5194 CXXRecordDecl *ClassDecl) { 5195 // C++ [class.copy]p4: 5196 // If the class definition does not explicitly declare a copy 5197 // constructor, one is declared implicitly. 5198 5199 // C++ [class.copy]p5: 5200 // The implicitly-declared copy constructor for a class X will 5201 // have the form 5202 // 5203 // X::X(const X&) 5204 // 5205 // if 5206 bool HasConstCopyConstructor = true; 5207 5208 // -- each direct or virtual base class B of X has a copy 5209 // constructor whose first parameter is of type const B& or 5210 // const volatile B&, and 5211 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5212 BaseEnd = ClassDecl->bases_end(); 5213 HasConstCopyConstructor && Base != BaseEnd; 5214 ++Base) { 5215 // Virtual bases are handled below. 5216 if (Base->isVirtual()) 5217 continue; 5218 5219 CXXRecordDecl *BaseClassDecl 5220 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5221 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5222 DeclareImplicitCopyConstructor(BaseClassDecl); 5223 5224 HasConstCopyConstructor 5225 = BaseClassDecl->hasConstCopyConstructor(Context); 5226 } 5227 5228 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5229 BaseEnd = ClassDecl->vbases_end(); 5230 HasConstCopyConstructor && Base != BaseEnd; 5231 ++Base) { 5232 CXXRecordDecl *BaseClassDecl 5233 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5234 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5235 DeclareImplicitCopyConstructor(BaseClassDecl); 5236 5237 HasConstCopyConstructor 5238 = BaseClassDecl->hasConstCopyConstructor(Context); 5239 } 5240 5241 // -- for all the nonstatic data members of X that are of a 5242 // class type M (or array thereof), each such class type 5243 // has a copy constructor whose first parameter is of type 5244 // const M& or const volatile M&. 5245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5246 FieldEnd = ClassDecl->field_end(); 5247 HasConstCopyConstructor && Field != FieldEnd; 5248 ++Field) { 5249 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5250 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5251 CXXRecordDecl *FieldClassDecl 5252 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5253 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5254 DeclareImplicitCopyConstructor(FieldClassDecl); 5255 5256 HasConstCopyConstructor 5257 = FieldClassDecl->hasConstCopyConstructor(Context); 5258 } 5259 } 5260 5261 // Otherwise, the implicitly declared copy constructor will have 5262 // the form 5263 // 5264 // X::X(X&) 5265 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5266 QualType ArgType = ClassType; 5267 if (HasConstCopyConstructor) 5268 ArgType = ArgType.withConst(); 5269 ArgType = Context.getLValueReferenceType(ArgType); 5270 5271 // C++ [except.spec]p14: 5272 // An implicitly declared special member function (Clause 12) shall have an 5273 // exception-specification. [...] 5274 ImplicitExceptionSpecification ExceptSpec(Context); 5275 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5276 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5277 BaseEnd = ClassDecl->bases_end(); 5278 Base != BaseEnd; 5279 ++Base) { 5280 // Virtual bases are handled below. 5281 if (Base->isVirtual()) 5282 continue; 5283 5284 CXXRecordDecl *BaseClassDecl 5285 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5286 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5287 DeclareImplicitCopyConstructor(BaseClassDecl); 5288 5289 if (CXXConstructorDecl *CopyConstructor 5290 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5291 ExceptSpec.CalledDecl(CopyConstructor); 5292 } 5293 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5294 BaseEnd = ClassDecl->vbases_end(); 5295 Base != BaseEnd; 5296 ++Base) { 5297 CXXRecordDecl *BaseClassDecl 5298 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5299 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5300 DeclareImplicitCopyConstructor(BaseClassDecl); 5301 5302 if (CXXConstructorDecl *CopyConstructor 5303 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5304 ExceptSpec.CalledDecl(CopyConstructor); 5305 } 5306 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5307 FieldEnd = ClassDecl->field_end(); 5308 Field != FieldEnd; 5309 ++Field) { 5310 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5311 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5312 CXXRecordDecl *FieldClassDecl 5313 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5314 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5315 DeclareImplicitCopyConstructor(FieldClassDecl); 5316 5317 if (CXXConstructorDecl *CopyConstructor 5318 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5319 ExceptSpec.CalledDecl(CopyConstructor); 5320 } 5321 } 5322 5323 // An implicitly-declared copy constructor is an inline public 5324 // member of its class. 5325 DeclarationName Name 5326 = Context.DeclarationNames.getCXXConstructorName( 5327 Context.getCanonicalType(ClassType)); 5328 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5329 CXXConstructorDecl *CopyConstructor 5330 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5331 Context.getFunctionType(Context.VoidTy, 5332 &ArgType, 1, 5333 false, 0, 5334 ExceptSpec.hasExceptionSpecification(), 5335 ExceptSpec.hasAnyExceptionSpecification(), 5336 ExceptSpec.size(), 5337 ExceptSpec.data(), 5338 FunctionType::ExtInfo()), 5339 /*TInfo=*/0, 5340 /*isExplicit=*/false, 5341 /*isInline=*/true, 5342 /*isImplicitlyDeclared=*/true); 5343 CopyConstructor->setAccess(AS_public); 5344 CopyConstructor->setImplicit(); 5345 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5346 5347 // Note that we have declared this constructor. 5348 ClassDecl->setDeclaredCopyConstructor(true); 5349 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5350 5351 // Add the parameter to the constructor. 5352 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5353 ClassDecl->getLocation(), 5354 /*IdentifierInfo=*/0, 5355 ArgType, /*TInfo=*/0, 5356 VarDecl::None, 5357 VarDecl::None, 0); 5358 CopyConstructor->setParams(&FromParam, 1); 5359 if (Scope *S = getScopeForContext(ClassDecl)) 5360 PushOnScopeChains(CopyConstructor, S, false); 5361 ClassDecl->addDecl(CopyConstructor); 5362 5363 return CopyConstructor; 5364} 5365 5366void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5367 CXXConstructorDecl *CopyConstructor, 5368 unsigned TypeQuals) { 5369 assert((CopyConstructor->isImplicit() && 5370 CopyConstructor->isCopyConstructor(TypeQuals) && 5371 !CopyConstructor->isUsed(false)) && 5372 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5373 5374 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5375 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5376 5377 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5378 ErrorTrap Trap(*this); 5379 5380 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5381 Trap.hasErrorOccurred()) { 5382 Diag(CurrentLocation, diag::note_member_synthesized_at) 5383 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5384 CopyConstructor->setInvalidDecl(); 5385 } else { 5386 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5387 CopyConstructor->getLocation(), 5388 MultiStmtArg(*this, 0, 0), 5389 /*isStmtExpr=*/false) 5390 .takeAs<Stmt>()); 5391 } 5392 5393 CopyConstructor->setUsed(); 5394} 5395 5396Sema::OwningExprResult 5397Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5398 CXXConstructorDecl *Constructor, 5399 MultiExprArg ExprArgs, 5400 bool RequiresZeroInit, 5401 CXXConstructExpr::ConstructionKind ConstructKind) { 5402 bool Elidable = false; 5403 5404 // C++0x [class.copy]p34: 5405 // When certain criteria are met, an implementation is allowed to 5406 // omit the copy/move construction of a class object, even if the 5407 // copy/move constructor and/or destructor for the object have 5408 // side effects. [...] 5409 // - when a temporary class object that has not been bound to a 5410 // reference (12.2) would be copied/moved to a class object 5411 // with the same cv-unqualified type, the copy/move operation 5412 // can be omitted by constructing the temporary object 5413 // directly into the target of the omitted copy/move 5414 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5415 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5416 Elidable = SubExpr->isTemporaryObject() && 5417 ConstructKind == CXXConstructExpr::CK_Complete && 5418 Context.hasSameUnqualifiedType(SubExpr->getType(), 5419 Context.getTypeDeclType(Constructor->getParent())); 5420 } 5421 5422 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5423 Elidable, move(ExprArgs), RequiresZeroInit, 5424 ConstructKind); 5425} 5426 5427/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5428/// including handling of its default argument expressions. 5429Sema::OwningExprResult 5430Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5431 CXXConstructorDecl *Constructor, bool Elidable, 5432 MultiExprArg ExprArgs, 5433 bool RequiresZeroInit, 5434 CXXConstructExpr::ConstructionKind ConstructKind) { 5435 unsigned NumExprs = ExprArgs.size(); 5436 Expr **Exprs = (Expr **)ExprArgs.release(); 5437 5438 MarkDeclarationReferenced(ConstructLoc, Constructor); 5439 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5440 Constructor, Elidable, Exprs, NumExprs, 5441 RequiresZeroInit, ConstructKind)); 5442} 5443 5444bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5445 CXXConstructorDecl *Constructor, 5446 MultiExprArg Exprs) { 5447 OwningExprResult TempResult = 5448 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5449 move(Exprs)); 5450 if (TempResult.isInvalid()) 5451 return true; 5452 5453 Expr *Temp = TempResult.takeAs<Expr>(); 5454 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5455 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5456 VD->setInit(Temp); 5457 5458 return false; 5459} 5460 5461void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5462 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5463 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5464 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5465 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5466 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5467 CheckDestructorAccess(VD->getLocation(), Destructor, 5468 PDiag(diag::err_access_dtor_var) 5469 << VD->getDeclName() 5470 << VD->getType()); 5471 5472 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5473 Diag(VD->getLocation(), diag::warn_global_destructor); 5474 } 5475} 5476 5477/// AddCXXDirectInitializerToDecl - This action is called immediately after 5478/// ActOnDeclarator, when a C++ direct initializer is present. 5479/// e.g: "int x(1);" 5480void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5481 SourceLocation LParenLoc, 5482 MultiExprArg Exprs, 5483 SourceLocation *CommaLocs, 5484 SourceLocation RParenLoc) { 5485 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5486 5487 // If there is no declaration, there was an error parsing it. Just ignore 5488 // the initializer. 5489 if (RealDecl == 0) 5490 return; 5491 5492 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5493 if (!VDecl) { 5494 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5495 RealDecl->setInvalidDecl(); 5496 return; 5497 } 5498 5499 // We will represent direct-initialization similarly to copy-initialization: 5500 // int x(1); -as-> int x = 1; 5501 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5502 // 5503 // Clients that want to distinguish between the two forms, can check for 5504 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5505 // A major benefit is that clients that don't particularly care about which 5506 // exactly form was it (like the CodeGen) can handle both cases without 5507 // special case code. 5508 5509 // C++ 8.5p11: 5510 // The form of initialization (using parentheses or '=') is generally 5511 // insignificant, but does matter when the entity being initialized has a 5512 // class type. 5513 5514 if (!VDecl->getType()->isDependentType() && 5515 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5516 diag::err_typecheck_decl_incomplete_type)) { 5517 VDecl->setInvalidDecl(); 5518 return; 5519 } 5520 5521 // The variable can not have an abstract class type. 5522 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5523 diag::err_abstract_type_in_decl, 5524 AbstractVariableType)) 5525 VDecl->setInvalidDecl(); 5526 5527 const VarDecl *Def; 5528 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5529 Diag(VDecl->getLocation(), diag::err_redefinition) 5530 << VDecl->getDeclName(); 5531 Diag(Def->getLocation(), diag::note_previous_definition); 5532 VDecl->setInvalidDecl(); 5533 return; 5534 } 5535 5536 // C++ [class.static.data]p4 5537 // If a static data member is of const integral or const 5538 // enumeration type, its declaration in the class definition can 5539 // specify a constant-initializer which shall be an integral 5540 // constant expression (5.19). In that case, the member can appear 5541 // in integral constant expressions. The member shall still be 5542 // defined in a namespace scope if it is used in the program and the 5543 // namespace scope definition shall not contain an initializer. 5544 // 5545 // We already performed a redefinition check above, but for static 5546 // data members we also need to check whether there was an in-class 5547 // declaration with an initializer. 5548 const VarDecl* PrevInit = 0; 5549 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5550 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5551 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5552 return; 5553 } 5554 5555 // If either the declaration has a dependent type or if any of the 5556 // expressions is type-dependent, we represent the initialization 5557 // via a ParenListExpr for later use during template instantiation. 5558 if (VDecl->getType()->isDependentType() || 5559 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5560 // Let clients know that initialization was done with a direct initializer. 5561 VDecl->setCXXDirectInitializer(true); 5562 5563 // Store the initialization expressions as a ParenListExpr. 5564 unsigned NumExprs = Exprs.size(); 5565 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5566 (Expr **)Exprs.release(), 5567 NumExprs, RParenLoc)); 5568 return; 5569 } 5570 5571 // Capture the variable that is being initialized and the style of 5572 // initialization. 5573 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5574 5575 // FIXME: Poor source location information. 5576 InitializationKind Kind 5577 = InitializationKind::CreateDirect(VDecl->getLocation(), 5578 LParenLoc, RParenLoc); 5579 5580 InitializationSequence InitSeq(*this, Entity, Kind, 5581 Exprs.get(), Exprs.size()); 5582 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5583 if (Result.isInvalid()) { 5584 VDecl->setInvalidDecl(); 5585 return; 5586 } 5587 5588 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5589 VDecl->setInit(Result.takeAs<Expr>()); 5590 VDecl->setCXXDirectInitializer(true); 5591 5592 if (!VDecl->isInvalidDecl() && 5593 !VDecl->getDeclContext()->isDependentContext() && 5594 VDecl->hasGlobalStorage() && 5595 !VDecl->getInit()->isConstantInitializer(Context, 5596 VDecl->getType()->isReferenceType())) 5597 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5598 << VDecl->getInit()->getSourceRange(); 5599 5600 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5601 FinalizeVarWithDestructor(VDecl, Record); 5602} 5603 5604/// \brief Given a constructor and the set of arguments provided for the 5605/// constructor, convert the arguments and add any required default arguments 5606/// to form a proper call to this constructor. 5607/// 5608/// \returns true if an error occurred, false otherwise. 5609bool 5610Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5611 MultiExprArg ArgsPtr, 5612 SourceLocation Loc, 5613 ASTOwningVector<Expr*> &ConvertedArgs) { 5614 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5615 unsigned NumArgs = ArgsPtr.size(); 5616 Expr **Args = (Expr **)ArgsPtr.get(); 5617 5618 const FunctionProtoType *Proto 5619 = Constructor->getType()->getAs<FunctionProtoType>(); 5620 assert(Proto && "Constructor without a prototype?"); 5621 unsigned NumArgsInProto = Proto->getNumArgs(); 5622 5623 // If too few arguments are available, we'll fill in the rest with defaults. 5624 if (NumArgs < NumArgsInProto) 5625 ConvertedArgs.reserve(NumArgsInProto); 5626 else 5627 ConvertedArgs.reserve(NumArgs); 5628 5629 VariadicCallType CallType = 5630 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5631 llvm::SmallVector<Expr *, 8> AllArgs; 5632 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5633 Proto, 0, Args, NumArgs, AllArgs, 5634 CallType); 5635 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5636 ConvertedArgs.push_back(AllArgs[i]); 5637 return Invalid; 5638} 5639 5640static inline bool 5641CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5642 const FunctionDecl *FnDecl) { 5643 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5644 if (isa<NamespaceDecl>(DC)) { 5645 return SemaRef.Diag(FnDecl->getLocation(), 5646 diag::err_operator_new_delete_declared_in_namespace) 5647 << FnDecl->getDeclName(); 5648 } 5649 5650 if (isa<TranslationUnitDecl>(DC) && 5651 FnDecl->getStorageClass() == FunctionDecl::Static) { 5652 return SemaRef.Diag(FnDecl->getLocation(), 5653 diag::err_operator_new_delete_declared_static) 5654 << FnDecl->getDeclName(); 5655 } 5656 5657 return false; 5658} 5659 5660static inline bool 5661CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5662 CanQualType ExpectedResultType, 5663 CanQualType ExpectedFirstParamType, 5664 unsigned DependentParamTypeDiag, 5665 unsigned InvalidParamTypeDiag) { 5666 QualType ResultType = 5667 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5668 5669 // Check that the result type is not dependent. 5670 if (ResultType->isDependentType()) 5671 return SemaRef.Diag(FnDecl->getLocation(), 5672 diag::err_operator_new_delete_dependent_result_type) 5673 << FnDecl->getDeclName() << ExpectedResultType; 5674 5675 // Check that the result type is what we expect. 5676 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5677 return SemaRef.Diag(FnDecl->getLocation(), 5678 diag::err_operator_new_delete_invalid_result_type) 5679 << FnDecl->getDeclName() << ExpectedResultType; 5680 5681 // A function template must have at least 2 parameters. 5682 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5683 return SemaRef.Diag(FnDecl->getLocation(), 5684 diag::err_operator_new_delete_template_too_few_parameters) 5685 << FnDecl->getDeclName(); 5686 5687 // The function decl must have at least 1 parameter. 5688 if (FnDecl->getNumParams() == 0) 5689 return SemaRef.Diag(FnDecl->getLocation(), 5690 diag::err_operator_new_delete_too_few_parameters) 5691 << FnDecl->getDeclName(); 5692 5693 // Check the the first parameter type is not dependent. 5694 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5695 if (FirstParamType->isDependentType()) 5696 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5697 << FnDecl->getDeclName() << ExpectedFirstParamType; 5698 5699 // Check that the first parameter type is what we expect. 5700 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5701 ExpectedFirstParamType) 5702 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5703 << FnDecl->getDeclName() << ExpectedFirstParamType; 5704 5705 return false; 5706} 5707 5708static bool 5709CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5710 // C++ [basic.stc.dynamic.allocation]p1: 5711 // A program is ill-formed if an allocation function is declared in a 5712 // namespace scope other than global scope or declared static in global 5713 // scope. 5714 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5715 return true; 5716 5717 CanQualType SizeTy = 5718 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5719 5720 // C++ [basic.stc.dynamic.allocation]p1: 5721 // The return type shall be void*. The first parameter shall have type 5722 // std::size_t. 5723 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5724 SizeTy, 5725 diag::err_operator_new_dependent_param_type, 5726 diag::err_operator_new_param_type)) 5727 return true; 5728 5729 // C++ [basic.stc.dynamic.allocation]p1: 5730 // The first parameter shall not have an associated default argument. 5731 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5732 return SemaRef.Diag(FnDecl->getLocation(), 5733 diag::err_operator_new_default_arg) 5734 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5735 5736 return false; 5737} 5738 5739static bool 5740CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5741 // C++ [basic.stc.dynamic.deallocation]p1: 5742 // A program is ill-formed if deallocation functions are declared in a 5743 // namespace scope other than global scope or declared static in global 5744 // scope. 5745 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5746 return true; 5747 5748 // C++ [basic.stc.dynamic.deallocation]p2: 5749 // Each deallocation function shall return void and its first parameter 5750 // shall be void*. 5751 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5752 SemaRef.Context.VoidPtrTy, 5753 diag::err_operator_delete_dependent_param_type, 5754 diag::err_operator_delete_param_type)) 5755 return true; 5756 5757 return false; 5758} 5759 5760/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5761/// of this overloaded operator is well-formed. If so, returns false; 5762/// otherwise, emits appropriate diagnostics and returns true. 5763bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5764 assert(FnDecl && FnDecl->isOverloadedOperator() && 5765 "Expected an overloaded operator declaration"); 5766 5767 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5768 5769 // C++ [over.oper]p5: 5770 // The allocation and deallocation functions, operator new, 5771 // operator new[], operator delete and operator delete[], are 5772 // described completely in 3.7.3. The attributes and restrictions 5773 // found in the rest of this subclause do not apply to them unless 5774 // explicitly stated in 3.7.3. 5775 if (Op == OO_Delete || Op == OO_Array_Delete) 5776 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5777 5778 if (Op == OO_New || Op == OO_Array_New) 5779 return CheckOperatorNewDeclaration(*this, FnDecl); 5780 5781 // C++ [over.oper]p6: 5782 // An operator function shall either be a non-static member 5783 // function or be a non-member function and have at least one 5784 // parameter whose type is a class, a reference to a class, an 5785 // enumeration, or a reference to an enumeration. 5786 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5787 if (MethodDecl->isStatic()) 5788 return Diag(FnDecl->getLocation(), 5789 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5790 } else { 5791 bool ClassOrEnumParam = false; 5792 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5793 ParamEnd = FnDecl->param_end(); 5794 Param != ParamEnd; ++Param) { 5795 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5796 if (ParamType->isDependentType() || ParamType->isRecordType() || 5797 ParamType->isEnumeralType()) { 5798 ClassOrEnumParam = true; 5799 break; 5800 } 5801 } 5802 5803 if (!ClassOrEnumParam) 5804 return Diag(FnDecl->getLocation(), 5805 diag::err_operator_overload_needs_class_or_enum) 5806 << FnDecl->getDeclName(); 5807 } 5808 5809 // C++ [over.oper]p8: 5810 // An operator function cannot have default arguments (8.3.6), 5811 // except where explicitly stated below. 5812 // 5813 // Only the function-call operator allows default arguments 5814 // (C++ [over.call]p1). 5815 if (Op != OO_Call) { 5816 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5817 Param != FnDecl->param_end(); ++Param) { 5818 if ((*Param)->hasDefaultArg()) 5819 return Diag((*Param)->getLocation(), 5820 diag::err_operator_overload_default_arg) 5821 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5822 } 5823 } 5824 5825 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5826 { false, false, false } 5827#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5828 , { Unary, Binary, MemberOnly } 5829#include "clang/Basic/OperatorKinds.def" 5830 }; 5831 5832 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5833 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5834 bool MustBeMemberOperator = OperatorUses[Op][2]; 5835 5836 // C++ [over.oper]p8: 5837 // [...] Operator functions cannot have more or fewer parameters 5838 // than the number required for the corresponding operator, as 5839 // described in the rest of this subclause. 5840 unsigned NumParams = FnDecl->getNumParams() 5841 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5842 if (Op != OO_Call && 5843 ((NumParams == 1 && !CanBeUnaryOperator) || 5844 (NumParams == 2 && !CanBeBinaryOperator) || 5845 (NumParams < 1) || (NumParams > 2))) { 5846 // We have the wrong number of parameters. 5847 unsigned ErrorKind; 5848 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5849 ErrorKind = 2; // 2 -> unary or binary. 5850 } else if (CanBeUnaryOperator) { 5851 ErrorKind = 0; // 0 -> unary 5852 } else { 5853 assert(CanBeBinaryOperator && 5854 "All non-call overloaded operators are unary or binary!"); 5855 ErrorKind = 1; // 1 -> binary 5856 } 5857 5858 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5859 << FnDecl->getDeclName() << NumParams << ErrorKind; 5860 } 5861 5862 // Overloaded operators other than operator() cannot be variadic. 5863 if (Op != OO_Call && 5864 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5865 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5866 << FnDecl->getDeclName(); 5867 } 5868 5869 // Some operators must be non-static member functions. 5870 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5871 return Diag(FnDecl->getLocation(), 5872 diag::err_operator_overload_must_be_member) 5873 << FnDecl->getDeclName(); 5874 } 5875 5876 // C++ [over.inc]p1: 5877 // The user-defined function called operator++ implements the 5878 // prefix and postfix ++ operator. If this function is a member 5879 // function with no parameters, or a non-member function with one 5880 // parameter of class or enumeration type, it defines the prefix 5881 // increment operator ++ for objects of that type. If the function 5882 // is a member function with one parameter (which shall be of type 5883 // int) or a non-member function with two parameters (the second 5884 // of which shall be of type int), it defines the postfix 5885 // increment operator ++ for objects of that type. 5886 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5887 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5888 bool ParamIsInt = false; 5889 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5890 ParamIsInt = BT->getKind() == BuiltinType::Int; 5891 5892 if (!ParamIsInt) 5893 return Diag(LastParam->getLocation(), 5894 diag::err_operator_overload_post_incdec_must_be_int) 5895 << LastParam->getType() << (Op == OO_MinusMinus); 5896 } 5897 5898 // Notify the class if it got an assignment operator. 5899 if (Op == OO_Equal) { 5900 // Would have returned earlier otherwise. 5901 assert(isa<CXXMethodDecl>(FnDecl) && 5902 "Overloaded = not member, but not filtered."); 5903 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5904 Method->getParent()->addedAssignmentOperator(Context, Method); 5905 } 5906 5907 return false; 5908} 5909 5910/// CheckLiteralOperatorDeclaration - Check whether the declaration 5911/// of this literal operator function is well-formed. If so, returns 5912/// false; otherwise, emits appropriate diagnostics and returns true. 5913bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5914 DeclContext *DC = FnDecl->getDeclContext(); 5915 Decl::Kind Kind = DC->getDeclKind(); 5916 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5917 Kind != Decl::LinkageSpec) { 5918 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5919 << FnDecl->getDeclName(); 5920 return true; 5921 } 5922 5923 bool Valid = false; 5924 5925 // template <char...> type operator "" name() is the only valid template 5926 // signature, and the only valid signature with no parameters. 5927 if (FnDecl->param_size() == 0) { 5928 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5929 // Must have only one template parameter 5930 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5931 if (Params->size() == 1) { 5932 NonTypeTemplateParmDecl *PmDecl = 5933 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5934 5935 // The template parameter must be a char parameter pack. 5936 // FIXME: This test will always fail because non-type parameter packs 5937 // have not been implemented. 5938 if (PmDecl && PmDecl->isTemplateParameterPack() && 5939 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5940 Valid = true; 5941 } 5942 } 5943 } else { 5944 // Check the first parameter 5945 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5946 5947 QualType T = (*Param)->getType(); 5948 5949 // unsigned long long int, long double, and any character type are allowed 5950 // as the only parameters. 5951 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5952 Context.hasSameType(T, Context.LongDoubleTy) || 5953 Context.hasSameType(T, Context.CharTy) || 5954 Context.hasSameType(T, Context.WCharTy) || 5955 Context.hasSameType(T, Context.Char16Ty) || 5956 Context.hasSameType(T, Context.Char32Ty)) { 5957 if (++Param == FnDecl->param_end()) 5958 Valid = true; 5959 goto FinishedParams; 5960 } 5961 5962 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5963 const PointerType *PT = T->getAs<PointerType>(); 5964 if (!PT) 5965 goto FinishedParams; 5966 T = PT->getPointeeType(); 5967 if (!T.isConstQualified()) 5968 goto FinishedParams; 5969 T = T.getUnqualifiedType(); 5970 5971 // Move on to the second parameter; 5972 ++Param; 5973 5974 // If there is no second parameter, the first must be a const char * 5975 if (Param == FnDecl->param_end()) { 5976 if (Context.hasSameType(T, Context.CharTy)) 5977 Valid = true; 5978 goto FinishedParams; 5979 } 5980 5981 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5982 // are allowed as the first parameter to a two-parameter function 5983 if (!(Context.hasSameType(T, Context.CharTy) || 5984 Context.hasSameType(T, Context.WCharTy) || 5985 Context.hasSameType(T, Context.Char16Ty) || 5986 Context.hasSameType(T, Context.Char32Ty))) 5987 goto FinishedParams; 5988 5989 // The second and final parameter must be an std::size_t 5990 T = (*Param)->getType().getUnqualifiedType(); 5991 if (Context.hasSameType(T, Context.getSizeType()) && 5992 ++Param == FnDecl->param_end()) 5993 Valid = true; 5994 } 5995 5996 // FIXME: This diagnostic is absolutely terrible. 5997FinishedParams: 5998 if (!Valid) { 5999 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6000 << FnDecl->getDeclName(); 6001 return true; 6002 } 6003 6004 return false; 6005} 6006 6007/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6008/// linkage specification, including the language and (if present) 6009/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6010/// the location of the language string literal, which is provided 6011/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6012/// the '{' brace. Otherwise, this linkage specification does not 6013/// have any braces. 6014Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6015 SourceLocation ExternLoc, 6016 SourceLocation LangLoc, 6017 llvm::StringRef Lang, 6018 SourceLocation LBraceLoc) { 6019 LinkageSpecDecl::LanguageIDs Language; 6020 if (Lang == "\"C\"") 6021 Language = LinkageSpecDecl::lang_c; 6022 else if (Lang == "\"C++\"") 6023 Language = LinkageSpecDecl::lang_cxx; 6024 else { 6025 Diag(LangLoc, diag::err_bad_language); 6026 return 0; 6027 } 6028 6029 // FIXME: Add all the various semantics of linkage specifications 6030 6031 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6032 LangLoc, Language, 6033 LBraceLoc.isValid()); 6034 CurContext->addDecl(D); 6035 PushDeclContext(S, D); 6036 return D; 6037} 6038 6039/// ActOnFinishLinkageSpecification - Complete the definition of 6040/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6041/// valid, it's the position of the closing '}' brace in a linkage 6042/// specification that uses braces. 6043Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6044 Decl *LinkageSpec, 6045 SourceLocation RBraceLoc) { 6046 if (LinkageSpec) 6047 PopDeclContext(); 6048 return LinkageSpec; 6049} 6050 6051/// \brief Perform semantic analysis for the variable declaration that 6052/// occurs within a C++ catch clause, returning the newly-created 6053/// variable. 6054VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6055 TypeSourceInfo *TInfo, 6056 IdentifierInfo *Name, 6057 SourceLocation Loc, 6058 SourceRange Range) { 6059 bool Invalid = false; 6060 6061 // Arrays and functions decay. 6062 if (ExDeclType->isArrayType()) 6063 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6064 else if (ExDeclType->isFunctionType()) 6065 ExDeclType = Context.getPointerType(ExDeclType); 6066 6067 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6068 // The exception-declaration shall not denote a pointer or reference to an 6069 // incomplete type, other than [cv] void*. 6070 // N2844 forbids rvalue references. 6071 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6072 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6073 Invalid = true; 6074 } 6075 6076 // GCC allows catching pointers and references to incomplete types 6077 // as an extension; so do we, but we warn by default. 6078 6079 QualType BaseType = ExDeclType; 6080 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6081 unsigned DK = diag::err_catch_incomplete; 6082 bool IncompleteCatchIsInvalid = true; 6083 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6084 BaseType = Ptr->getPointeeType(); 6085 Mode = 1; 6086 DK = diag::ext_catch_incomplete_ptr; 6087 IncompleteCatchIsInvalid = false; 6088 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6089 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6090 BaseType = Ref->getPointeeType(); 6091 Mode = 2; 6092 DK = diag::ext_catch_incomplete_ref; 6093 IncompleteCatchIsInvalid = false; 6094 } 6095 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6096 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6097 IncompleteCatchIsInvalid) 6098 Invalid = true; 6099 6100 if (!Invalid && !ExDeclType->isDependentType() && 6101 RequireNonAbstractType(Loc, ExDeclType, 6102 diag::err_abstract_type_in_decl, 6103 AbstractVariableType)) 6104 Invalid = true; 6105 6106 // Only the non-fragile NeXT runtime currently supports C++ catches 6107 // of ObjC types, and no runtime supports catching ObjC types by value. 6108 if (!Invalid && getLangOptions().ObjC1) { 6109 QualType T = ExDeclType; 6110 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6111 T = RT->getPointeeType(); 6112 6113 if (T->isObjCObjectType()) { 6114 Diag(Loc, diag::err_objc_object_catch); 6115 Invalid = true; 6116 } else if (T->isObjCObjectPointerType()) { 6117 if (!getLangOptions().NeXTRuntime) { 6118 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6119 Invalid = true; 6120 } else if (!getLangOptions().ObjCNonFragileABI) { 6121 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6122 Invalid = true; 6123 } 6124 } 6125 } 6126 6127 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6128 Name, ExDeclType, TInfo, VarDecl::None, 6129 VarDecl::None); 6130 ExDecl->setExceptionVariable(true); 6131 6132 if (!Invalid) { 6133 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6134 // C++ [except.handle]p16: 6135 // The object declared in an exception-declaration or, if the 6136 // exception-declaration does not specify a name, a temporary (12.2) is 6137 // copy-initialized (8.5) from the exception object. [...] 6138 // The object is destroyed when the handler exits, after the destruction 6139 // of any automatic objects initialized within the handler. 6140 // 6141 // We just pretend to initialize the object with itself, then make sure 6142 // it can be destroyed later. 6143 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6144 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6145 Loc, ExDeclType, 0); 6146 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6147 SourceLocation()); 6148 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6149 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6150 MultiExprArg(*this, &ExDeclRef, 1)); 6151 if (Result.isInvalid()) 6152 Invalid = true; 6153 else 6154 FinalizeVarWithDestructor(ExDecl, RecordTy); 6155 } 6156 } 6157 6158 if (Invalid) 6159 ExDecl->setInvalidDecl(); 6160 6161 return ExDecl; 6162} 6163 6164/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6165/// handler. 6166Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6167 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6168 QualType ExDeclType = TInfo->getType(); 6169 6170 bool Invalid = D.isInvalidType(); 6171 IdentifierInfo *II = D.getIdentifier(); 6172 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6173 LookupOrdinaryName, 6174 ForRedeclaration)) { 6175 // The scope should be freshly made just for us. There is just no way 6176 // it contains any previous declaration. 6177 assert(!S->isDeclScope(PrevDecl)); 6178 if (PrevDecl->isTemplateParameter()) { 6179 // Maybe we will complain about the shadowed template parameter. 6180 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6181 } 6182 } 6183 6184 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6185 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6186 << D.getCXXScopeSpec().getRange(); 6187 Invalid = true; 6188 } 6189 6190 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6191 D.getIdentifier(), 6192 D.getIdentifierLoc(), 6193 D.getDeclSpec().getSourceRange()); 6194 6195 if (Invalid) 6196 ExDecl->setInvalidDecl(); 6197 6198 // Add the exception declaration into this scope. 6199 if (II) 6200 PushOnScopeChains(ExDecl, S); 6201 else 6202 CurContext->addDecl(ExDecl); 6203 6204 ProcessDeclAttributes(S, ExDecl, D); 6205 return ExDecl; 6206} 6207 6208Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6209 Expr *AssertExpr, 6210 Expr *AssertMessageExpr_) { 6211 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6212 6213 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6214 llvm::APSInt Value(32); 6215 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6216 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6217 AssertExpr->getSourceRange(); 6218 return 0; 6219 } 6220 6221 if (Value == 0) { 6222 Diag(AssertLoc, diag::err_static_assert_failed) 6223 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6224 } 6225 } 6226 6227 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6228 AssertExpr, AssertMessage); 6229 6230 CurContext->addDecl(Decl); 6231 return Decl; 6232} 6233 6234/// \brief Perform semantic analysis of the given friend type declaration. 6235/// 6236/// \returns A friend declaration that. 6237FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6238 TypeSourceInfo *TSInfo) { 6239 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6240 6241 QualType T = TSInfo->getType(); 6242 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6243 6244 if (!getLangOptions().CPlusPlus0x) { 6245 // C++03 [class.friend]p2: 6246 // An elaborated-type-specifier shall be used in a friend declaration 6247 // for a class.* 6248 // 6249 // * The class-key of the elaborated-type-specifier is required. 6250 if (!ActiveTemplateInstantiations.empty()) { 6251 // Do not complain about the form of friend template types during 6252 // template instantiation; we will already have complained when the 6253 // template was declared. 6254 } else if (!T->isElaboratedTypeSpecifier()) { 6255 // If we evaluated the type to a record type, suggest putting 6256 // a tag in front. 6257 if (const RecordType *RT = T->getAs<RecordType>()) { 6258 RecordDecl *RD = RT->getDecl(); 6259 6260 std::string InsertionText = std::string(" ") + RD->getKindName(); 6261 6262 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6263 << (unsigned) RD->getTagKind() 6264 << T 6265 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6266 InsertionText); 6267 } else { 6268 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6269 << T 6270 << SourceRange(FriendLoc, TypeRange.getEnd()); 6271 } 6272 } else if (T->getAs<EnumType>()) { 6273 Diag(FriendLoc, diag::ext_enum_friend) 6274 << T 6275 << SourceRange(FriendLoc, TypeRange.getEnd()); 6276 } 6277 } 6278 6279 // C++0x [class.friend]p3: 6280 // If the type specifier in a friend declaration designates a (possibly 6281 // cv-qualified) class type, that class is declared as a friend; otherwise, 6282 // the friend declaration is ignored. 6283 6284 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6285 // in [class.friend]p3 that we do not implement. 6286 6287 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6288} 6289 6290/// Handle a friend type declaration. This works in tandem with 6291/// ActOnTag. 6292/// 6293/// Notes on friend class templates: 6294/// 6295/// We generally treat friend class declarations as if they were 6296/// declaring a class. So, for example, the elaborated type specifier 6297/// in a friend declaration is required to obey the restrictions of a 6298/// class-head (i.e. no typedefs in the scope chain), template 6299/// parameters are required to match up with simple template-ids, &c. 6300/// However, unlike when declaring a template specialization, it's 6301/// okay to refer to a template specialization without an empty 6302/// template parameter declaration, e.g. 6303/// friend class A<T>::B<unsigned>; 6304/// We permit this as a special case; if there are any template 6305/// parameters present at all, require proper matching, i.e. 6306/// template <> template <class T> friend class A<int>::B; 6307Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6308 MultiTemplateParamsArg TempParams) { 6309 SourceLocation Loc = DS.getSourceRange().getBegin(); 6310 6311 assert(DS.isFriendSpecified()); 6312 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6313 6314 // Try to convert the decl specifier to a type. This works for 6315 // friend templates because ActOnTag never produces a ClassTemplateDecl 6316 // for a TUK_Friend. 6317 Declarator TheDeclarator(DS, Declarator::MemberContext); 6318 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6319 QualType T = TSI->getType(); 6320 if (TheDeclarator.isInvalidType()) 6321 return 0; 6322 6323 // This is definitely an error in C++98. It's probably meant to 6324 // be forbidden in C++0x, too, but the specification is just 6325 // poorly written. 6326 // 6327 // The problem is with declarations like the following: 6328 // template <T> friend A<T>::foo; 6329 // where deciding whether a class C is a friend or not now hinges 6330 // on whether there exists an instantiation of A that causes 6331 // 'foo' to equal C. There are restrictions on class-heads 6332 // (which we declare (by fiat) elaborated friend declarations to 6333 // be) that makes this tractable. 6334 // 6335 // FIXME: handle "template <> friend class A<T>;", which 6336 // is possibly well-formed? Who even knows? 6337 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6338 Diag(Loc, diag::err_tagless_friend_type_template) 6339 << DS.getSourceRange(); 6340 return 0; 6341 } 6342 6343 // C++98 [class.friend]p1: A friend of a class is a function 6344 // or class that is not a member of the class . . . 6345 // This is fixed in DR77, which just barely didn't make the C++03 6346 // deadline. It's also a very silly restriction that seriously 6347 // affects inner classes and which nobody else seems to implement; 6348 // thus we never diagnose it, not even in -pedantic. 6349 // 6350 // But note that we could warn about it: it's always useless to 6351 // friend one of your own members (it's not, however, worthless to 6352 // friend a member of an arbitrary specialization of your template). 6353 6354 Decl *D; 6355 if (unsigned NumTempParamLists = TempParams.size()) 6356 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6357 NumTempParamLists, 6358 (TemplateParameterList**) TempParams.release(), 6359 TSI, 6360 DS.getFriendSpecLoc()); 6361 else 6362 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6363 6364 if (!D) 6365 return 0; 6366 6367 D->setAccess(AS_public); 6368 CurContext->addDecl(D); 6369 6370 return D; 6371} 6372 6373Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6374 Declarator &D, 6375 bool IsDefinition, 6376 MultiTemplateParamsArg TemplateParams) { 6377 const DeclSpec &DS = D.getDeclSpec(); 6378 6379 assert(DS.isFriendSpecified()); 6380 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6381 6382 SourceLocation Loc = D.getIdentifierLoc(); 6383 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6384 QualType T = TInfo->getType(); 6385 6386 // C++ [class.friend]p1 6387 // A friend of a class is a function or class.... 6388 // Note that this sees through typedefs, which is intended. 6389 // It *doesn't* see through dependent types, which is correct 6390 // according to [temp.arg.type]p3: 6391 // If a declaration acquires a function type through a 6392 // type dependent on a template-parameter and this causes 6393 // a declaration that does not use the syntactic form of a 6394 // function declarator to have a function type, the program 6395 // is ill-formed. 6396 if (!T->isFunctionType()) { 6397 Diag(Loc, diag::err_unexpected_friend); 6398 6399 // It might be worthwhile to try to recover by creating an 6400 // appropriate declaration. 6401 return 0; 6402 } 6403 6404 // C++ [namespace.memdef]p3 6405 // - If a friend declaration in a non-local class first declares a 6406 // class or function, the friend class or function is a member 6407 // of the innermost enclosing namespace. 6408 // - The name of the friend is not found by simple name lookup 6409 // until a matching declaration is provided in that namespace 6410 // scope (either before or after the class declaration granting 6411 // friendship). 6412 // - If a friend function is called, its name may be found by the 6413 // name lookup that considers functions from namespaces and 6414 // classes associated with the types of the function arguments. 6415 // - When looking for a prior declaration of a class or a function 6416 // declared as a friend, scopes outside the innermost enclosing 6417 // namespace scope are not considered. 6418 6419 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6420 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6421 DeclarationName Name = NameInfo.getName(); 6422 assert(Name); 6423 6424 // The context we found the declaration in, or in which we should 6425 // create the declaration. 6426 DeclContext *DC; 6427 6428 // FIXME: handle local classes 6429 6430 // Recover from invalid scope qualifiers as if they just weren't there. 6431 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6432 ForRedeclaration); 6433 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6434 DC = computeDeclContext(ScopeQual); 6435 6436 // FIXME: handle dependent contexts 6437 if (!DC) return 0; 6438 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6439 6440 LookupQualifiedName(Previous, DC); 6441 6442 // Ignore things found implicitly in the wrong scope. 6443 // TODO: better diagnostics for this case. Suggesting the right 6444 // qualified scope would be nice... 6445 LookupResult::Filter F = Previous.makeFilter(); 6446 while (F.hasNext()) { 6447 NamedDecl *D = F.next(); 6448 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6449 F.erase(); 6450 } 6451 F.done(); 6452 6453 if (Previous.empty()) { 6454 D.setInvalidType(); 6455 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6456 return 0; 6457 } 6458 6459 // C++ [class.friend]p1: A friend of a class is a function or 6460 // class that is not a member of the class . . . 6461 if (DC->Equals(CurContext)) 6462 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6463 6464 // Otherwise walk out to the nearest namespace scope looking for matches. 6465 } else { 6466 // TODO: handle local class contexts. 6467 6468 DC = CurContext; 6469 while (true) { 6470 // Skip class contexts. If someone can cite chapter and verse 6471 // for this behavior, that would be nice --- it's what GCC and 6472 // EDG do, and it seems like a reasonable intent, but the spec 6473 // really only says that checks for unqualified existing 6474 // declarations should stop at the nearest enclosing namespace, 6475 // not that they should only consider the nearest enclosing 6476 // namespace. 6477 while (DC->isRecord()) 6478 DC = DC->getParent(); 6479 6480 LookupQualifiedName(Previous, DC); 6481 6482 // TODO: decide what we think about using declarations. 6483 if (!Previous.empty()) 6484 break; 6485 6486 if (DC->isFileContext()) break; 6487 DC = DC->getParent(); 6488 } 6489 6490 // C++ [class.friend]p1: A friend of a class is a function or 6491 // class that is not a member of the class . . . 6492 // C++0x changes this for both friend types and functions. 6493 // Most C++ 98 compilers do seem to give an error here, so 6494 // we do, too. 6495 if (!Previous.empty() && DC->Equals(CurContext) 6496 && !getLangOptions().CPlusPlus0x) 6497 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6498 } 6499 6500 if (DC->isFileContext()) { 6501 // This implies that it has to be an operator or function. 6502 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6503 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6504 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6505 Diag(Loc, diag::err_introducing_special_friend) << 6506 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6507 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6508 return 0; 6509 } 6510 } 6511 6512 bool Redeclaration = false; 6513 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6514 move(TemplateParams), 6515 IsDefinition, 6516 Redeclaration); 6517 if (!ND) return 0; 6518 6519 assert(ND->getDeclContext() == DC); 6520 assert(ND->getLexicalDeclContext() == CurContext); 6521 6522 // Add the function declaration to the appropriate lookup tables, 6523 // adjusting the redeclarations list as necessary. We don't 6524 // want to do this yet if the friending class is dependent. 6525 // 6526 // Also update the scope-based lookup if the target context's 6527 // lookup context is in lexical scope. 6528 if (!CurContext->isDependentContext()) { 6529 DC = DC->getLookupContext(); 6530 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6531 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6532 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6533 } 6534 6535 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6536 D.getIdentifierLoc(), ND, 6537 DS.getFriendSpecLoc()); 6538 FrD->setAccess(AS_public); 6539 CurContext->addDecl(FrD); 6540 6541 return ND; 6542} 6543 6544void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6545 AdjustDeclIfTemplate(Dcl); 6546 6547 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6548 if (!Fn) { 6549 Diag(DelLoc, diag::err_deleted_non_function); 6550 return; 6551 } 6552 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6553 Diag(DelLoc, diag::err_deleted_decl_not_first); 6554 Diag(Prev->getLocation(), diag::note_previous_declaration); 6555 // If the declaration wasn't the first, we delete the function anyway for 6556 // recovery. 6557 } 6558 Fn->setDeleted(); 6559} 6560 6561static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6562 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6563 ++CI) { 6564 Stmt *SubStmt = *CI; 6565 if (!SubStmt) 6566 continue; 6567 if (isa<ReturnStmt>(SubStmt)) 6568 Self.Diag(SubStmt->getSourceRange().getBegin(), 6569 diag::err_return_in_constructor_handler); 6570 if (!isa<Expr>(SubStmt)) 6571 SearchForReturnInStmt(Self, SubStmt); 6572 } 6573} 6574 6575void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6576 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6577 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6578 SearchForReturnInStmt(*this, Handler); 6579 } 6580} 6581 6582bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6583 const CXXMethodDecl *Old) { 6584 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6585 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6586 6587 if (Context.hasSameType(NewTy, OldTy) || 6588 NewTy->isDependentType() || OldTy->isDependentType()) 6589 return false; 6590 6591 // Check if the return types are covariant 6592 QualType NewClassTy, OldClassTy; 6593 6594 /// Both types must be pointers or references to classes. 6595 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6596 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6597 NewClassTy = NewPT->getPointeeType(); 6598 OldClassTy = OldPT->getPointeeType(); 6599 } 6600 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6601 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6602 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6603 NewClassTy = NewRT->getPointeeType(); 6604 OldClassTy = OldRT->getPointeeType(); 6605 } 6606 } 6607 } 6608 6609 // The return types aren't either both pointers or references to a class type. 6610 if (NewClassTy.isNull()) { 6611 Diag(New->getLocation(), 6612 diag::err_different_return_type_for_overriding_virtual_function) 6613 << New->getDeclName() << NewTy << OldTy; 6614 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6615 6616 return true; 6617 } 6618 6619 // C++ [class.virtual]p6: 6620 // If the return type of D::f differs from the return type of B::f, the 6621 // class type in the return type of D::f shall be complete at the point of 6622 // declaration of D::f or shall be the class type D. 6623 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6624 if (!RT->isBeingDefined() && 6625 RequireCompleteType(New->getLocation(), NewClassTy, 6626 PDiag(diag::err_covariant_return_incomplete) 6627 << New->getDeclName())) 6628 return true; 6629 } 6630 6631 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6632 // Check if the new class derives from the old class. 6633 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6634 Diag(New->getLocation(), 6635 diag::err_covariant_return_not_derived) 6636 << New->getDeclName() << NewTy << OldTy; 6637 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6638 return true; 6639 } 6640 6641 // Check if we the conversion from derived to base is valid. 6642 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6643 diag::err_covariant_return_inaccessible_base, 6644 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6645 // FIXME: Should this point to the return type? 6646 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6647 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6648 return true; 6649 } 6650 } 6651 6652 // The qualifiers of the return types must be the same. 6653 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6654 Diag(New->getLocation(), 6655 diag::err_covariant_return_type_different_qualifications) 6656 << New->getDeclName() << NewTy << OldTy; 6657 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6658 return true; 6659 }; 6660 6661 6662 // The new class type must have the same or less qualifiers as the old type. 6663 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6664 Diag(New->getLocation(), 6665 diag::err_covariant_return_type_class_type_more_qualified) 6666 << New->getDeclName() << NewTy << OldTy; 6667 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6668 return true; 6669 }; 6670 6671 return false; 6672} 6673 6674bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6675 const CXXMethodDecl *Old) 6676{ 6677 if (Old->hasAttr<FinalAttr>()) { 6678 Diag(New->getLocation(), diag::err_final_function_overridden) 6679 << New->getDeclName(); 6680 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6681 return true; 6682 } 6683 6684 return false; 6685} 6686 6687/// \brief Mark the given method pure. 6688/// 6689/// \param Method the method to be marked pure. 6690/// 6691/// \param InitRange the source range that covers the "0" initializer. 6692bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6693 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6694 Method->setPure(); 6695 6696 // A class is abstract if at least one function is pure virtual. 6697 Method->getParent()->setAbstract(true); 6698 return false; 6699 } 6700 6701 if (!Method->isInvalidDecl()) 6702 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6703 << Method->getDeclName() << InitRange; 6704 return true; 6705} 6706 6707/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6708/// an initializer for the out-of-line declaration 'Dcl'. The scope 6709/// is a fresh scope pushed for just this purpose. 6710/// 6711/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6712/// static data member of class X, names should be looked up in the scope of 6713/// class X. 6714void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6715 // If there is no declaration, there was an error parsing it. 6716 if (D == 0) return; 6717 6718 // We should only get called for declarations with scope specifiers, like: 6719 // int foo::bar; 6720 assert(D->isOutOfLine()); 6721 EnterDeclaratorContext(S, D->getDeclContext()); 6722} 6723 6724/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6725/// initializer for the out-of-line declaration 'D'. 6726void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6727 // If there is no declaration, there was an error parsing it. 6728 if (D == 0) return; 6729 6730 assert(D->isOutOfLine()); 6731 ExitDeclaratorContext(S); 6732} 6733 6734/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6735/// C++ if/switch/while/for statement. 6736/// e.g: "if (int x = f()) {...}" 6737DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6738 // C++ 6.4p2: 6739 // The declarator shall not specify a function or an array. 6740 // The type-specifier-seq shall not contain typedef and shall not declare a 6741 // new class or enumeration. 6742 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6743 "Parser allowed 'typedef' as storage class of condition decl."); 6744 6745 TagDecl *OwnedTag = 0; 6746 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6747 QualType Ty = TInfo->getType(); 6748 6749 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6750 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6751 // would be created and CXXConditionDeclExpr wants a VarDecl. 6752 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6753 << D.getSourceRange(); 6754 return DeclResult(); 6755 } else if (OwnedTag && OwnedTag->isDefinition()) { 6756 // The type-specifier-seq shall not declare a new class or enumeration. 6757 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6758 } 6759 6760 Decl *Dcl = ActOnDeclarator(S, D); 6761 if (!Dcl) 6762 return DeclResult(); 6763 6764 return Dcl; 6765} 6766 6767void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6768 bool DefinitionRequired) { 6769 // Ignore any vtable uses in unevaluated operands or for classes that do 6770 // not have a vtable. 6771 if (!Class->isDynamicClass() || Class->isDependentContext() || 6772 CurContext->isDependentContext() || 6773 ExprEvalContexts.back().Context == Unevaluated) 6774 return; 6775 6776 // Try to insert this class into the map. 6777 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6778 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6779 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6780 if (!Pos.second) { 6781 // If we already had an entry, check to see if we are promoting this vtable 6782 // to required a definition. If so, we need to reappend to the VTableUses 6783 // list, since we may have already processed the first entry. 6784 if (DefinitionRequired && !Pos.first->second) { 6785 Pos.first->second = true; 6786 } else { 6787 // Otherwise, we can early exit. 6788 return; 6789 } 6790 } 6791 6792 // Local classes need to have their virtual members marked 6793 // immediately. For all other classes, we mark their virtual members 6794 // at the end of the translation unit. 6795 if (Class->isLocalClass()) 6796 MarkVirtualMembersReferenced(Loc, Class); 6797 else 6798 VTableUses.push_back(std::make_pair(Class, Loc)); 6799} 6800 6801bool Sema::DefineUsedVTables() { 6802 // If any dynamic classes have their key function defined within 6803 // this translation unit, then those vtables are considered "used" and must 6804 // be emitted. 6805 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6806 if (const CXXMethodDecl *KeyFunction 6807 = Context.getKeyFunction(DynamicClasses[I])) { 6808 const FunctionDecl *Definition = 0; 6809 if (KeyFunction->hasBody(Definition)) 6810 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6811 } 6812 } 6813 6814 if (VTableUses.empty()) 6815 return false; 6816 6817 // Note: The VTableUses vector could grow as a result of marking 6818 // the members of a class as "used", so we check the size each 6819 // time through the loop and prefer indices (with are stable) to 6820 // iterators (which are not). 6821 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6822 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6823 if (!Class) 6824 continue; 6825 6826 SourceLocation Loc = VTableUses[I].second; 6827 6828 // If this class has a key function, but that key function is 6829 // defined in another translation unit, we don't need to emit the 6830 // vtable even though we're using it. 6831 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6832 if (KeyFunction && !KeyFunction->hasBody()) { 6833 switch (KeyFunction->getTemplateSpecializationKind()) { 6834 case TSK_Undeclared: 6835 case TSK_ExplicitSpecialization: 6836 case TSK_ExplicitInstantiationDeclaration: 6837 // The key function is in another translation unit. 6838 continue; 6839 6840 case TSK_ExplicitInstantiationDefinition: 6841 case TSK_ImplicitInstantiation: 6842 // We will be instantiating the key function. 6843 break; 6844 } 6845 } else if (!KeyFunction) { 6846 // If we have a class with no key function that is the subject 6847 // of an explicit instantiation declaration, suppress the 6848 // vtable; it will live with the explicit instantiation 6849 // definition. 6850 bool IsExplicitInstantiationDeclaration 6851 = Class->getTemplateSpecializationKind() 6852 == TSK_ExplicitInstantiationDeclaration; 6853 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6854 REnd = Class->redecls_end(); 6855 R != REnd; ++R) { 6856 TemplateSpecializationKind TSK 6857 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6858 if (TSK == TSK_ExplicitInstantiationDeclaration) 6859 IsExplicitInstantiationDeclaration = true; 6860 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6861 IsExplicitInstantiationDeclaration = false; 6862 break; 6863 } 6864 } 6865 6866 if (IsExplicitInstantiationDeclaration) 6867 continue; 6868 } 6869 6870 // Mark all of the virtual members of this class as referenced, so 6871 // that we can build a vtable. Then, tell the AST consumer that a 6872 // vtable for this class is required. 6873 MarkVirtualMembersReferenced(Loc, Class); 6874 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6875 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6876 6877 // Optionally warn if we're emitting a weak vtable. 6878 if (Class->getLinkage() == ExternalLinkage && 6879 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6880 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6881 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6882 } 6883 } 6884 VTableUses.clear(); 6885 6886 return true; 6887} 6888 6889void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6890 const CXXRecordDecl *RD) { 6891 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6892 e = RD->method_end(); i != e; ++i) { 6893 CXXMethodDecl *MD = *i; 6894 6895 // C++ [basic.def.odr]p2: 6896 // [...] A virtual member function is used if it is not pure. [...] 6897 if (MD->isVirtual() && !MD->isPure()) 6898 MarkDeclarationReferenced(Loc, MD); 6899 } 6900 6901 // Only classes that have virtual bases need a VTT. 6902 if (RD->getNumVBases() == 0) 6903 return; 6904 6905 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6906 e = RD->bases_end(); i != e; ++i) { 6907 const CXXRecordDecl *Base = 6908 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6909 if (Base->getNumVBases() == 0) 6910 continue; 6911 MarkVirtualMembersReferenced(Loc, Base); 6912 } 6913} 6914 6915/// SetIvarInitializers - This routine builds initialization ASTs for the 6916/// Objective-C implementation whose ivars need be initialized. 6917void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6918 if (!getLangOptions().CPlusPlus) 6919 return; 6920 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6921 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6922 CollectIvarsToConstructOrDestruct(OID, ivars); 6923 if (ivars.empty()) 6924 return; 6925 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6926 for (unsigned i = 0; i < ivars.size(); i++) { 6927 FieldDecl *Field = ivars[i]; 6928 if (Field->isInvalidDecl()) 6929 continue; 6930 6931 CXXBaseOrMemberInitializer *Member; 6932 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6933 InitializationKind InitKind = 6934 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6935 6936 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6937 Sema::OwningExprResult MemberInit = 6938 InitSeq.Perform(*this, InitEntity, InitKind, 6939 Sema::MultiExprArg(*this, 0, 0)); 6940 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6941 // Note, MemberInit could actually come back empty if no initialization 6942 // is required (e.g., because it would call a trivial default constructor) 6943 if (!MemberInit.get() || MemberInit.isInvalid()) 6944 continue; 6945 6946 Member = 6947 new (Context) CXXBaseOrMemberInitializer(Context, 6948 Field, SourceLocation(), 6949 SourceLocation(), 6950 MemberInit.takeAs<Expr>(), 6951 SourceLocation()); 6952 AllToInit.push_back(Member); 6953 6954 // Be sure that the destructor is accessible and is marked as referenced. 6955 if (const RecordType *RecordTy 6956 = Context.getBaseElementType(Field->getType()) 6957 ->getAs<RecordType>()) { 6958 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6959 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6960 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6961 CheckDestructorAccess(Field->getLocation(), Destructor, 6962 PDiag(diag::err_access_dtor_ivar) 6963 << Context.getBaseElementType(Field->getType())); 6964 } 6965 } 6966 } 6967 ObjCImplementation->setIvarInitializers(Context, 6968 AllToInit.data(), AllToInit.size()); 6969 } 6970} 6971