SemaDeclCXX.cpp revision 6699220f73f11e471b5e5aa42eaf064afeaa079e
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 "Sema.h" 15#include "SemaInit.h" 16#include "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/Parse/DeclSpec.h" 27#include "clang/Parse/Template.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, ExprArg DefaultArg, 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 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 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(DeclPtrTy 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.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 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(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 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 CXXBaseSpecifierArray &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(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::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 CXXBaseSpecifierArray *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 CXXBaseSpecifierArray *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. 875Sema::DeclPtrTy 876Sema::ActOnAccessSpecifier(AccessSpecifier Access, 877 SourceLocation ASLoc, 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 DeclPtrTy::make(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. 889Sema::DeclPtrTy 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 DeclarationName Name = GetNameForDeclarator(D); 896 Expr *BitWidth = static_cast<Expr*>(BW); 897 Expr *Init = static_cast<Expr*>(InitExpr); 898 SourceLocation Loc = D.getIdentifierLoc(); 899 900 assert(isa<CXXRecordDecl>(CurContext)); 901 assert(!DS.isFriendSpecified()); 902 903 bool isFunc = false; 904 if (D.isFunctionDeclarator()) 905 isFunc = true; 906 else if (D.getNumTypeObjects() == 0 && 907 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 908 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 909 isFunc = TDType->isFunctionType(); 910 } 911 912 // C++ 9.2p6: A member shall not be declared to have automatic storage 913 // duration (auto, register) or with the extern storage-class-specifier. 914 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 915 // data members and cannot be applied to names declared const or static, 916 // and cannot be applied to reference members. 917 switch (DS.getStorageClassSpec()) { 918 case DeclSpec::SCS_unspecified: 919 case DeclSpec::SCS_typedef: 920 case DeclSpec::SCS_static: 921 // FALL THROUGH. 922 break; 923 case DeclSpec::SCS_mutable: 924 if (isFunc) { 925 if (DS.getStorageClassSpecLoc().isValid()) 926 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 927 else 928 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 929 930 // FIXME: It would be nicer if the keyword was ignored only for this 931 // declarator. Otherwise we could get follow-up errors. 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 break; 935 default: 936 if (DS.getStorageClassSpecLoc().isValid()) 937 Diag(DS.getStorageClassSpecLoc(), 938 diag::err_storageclass_invalid_for_member); 939 else 940 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 941 D.getMutableDeclSpec().ClearStorageClassSpecs(); 942 } 943 944 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 945 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 946 !isFunc); 947 948 Decl *Member; 949 if (isInstField) { 950 // FIXME: Check for template parameters! 951 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 952 AS); 953 assert(Member && "HandleField never returns null"); 954 } else { 955 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 956 .getAs<Decl>(); 957 if (!Member) { 958 if (BitWidth) DeleteExpr(BitWidth); 959 return DeclPtrTy(); 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(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1000 if (Deleted) // FIXME: Source location is not very good. 1001 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1002 1003 if (isInstField) { 1004 FieldCollector->Add(cast<FieldDecl>(Member)); 1005 return DeclPtrTy(); 1006 } 1007 return DeclPtrTy::make(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(DeclPtrTy 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.getAs<Decl>()); 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 } 1143 } 1144 1145 // If no results were found, try to correct typos. 1146 if (R.empty() && BaseType.isNull() && 1147 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1148 R.isSingleResult()) { 1149 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1150 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1151 // We have found a non-static data member with a similar 1152 // name to what was typed; complain and initialize that 1153 // member. 1154 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1155 << MemberOrBase << true << R.getLookupName() 1156 << FixItHint::CreateReplacement(R.getNameLoc(), 1157 R.getLookupName().getAsString()); 1158 Diag(Member->getLocation(), diag::note_previous_decl) 1159 << Member->getDeclName(); 1160 1161 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1162 LParenLoc, RParenLoc); 1163 } 1164 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1165 const CXXBaseSpecifier *DirectBaseSpec; 1166 const CXXBaseSpecifier *VirtualBaseSpec; 1167 if (FindBaseInitializer(*this, ClassDecl, 1168 Context.getTypeDeclType(Type), 1169 DirectBaseSpec, VirtualBaseSpec)) { 1170 // We have found a direct or virtual base class with a 1171 // similar name to what was typed; complain and initialize 1172 // that base class. 1173 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1174 << MemberOrBase << false << R.getLookupName() 1175 << FixItHint::CreateReplacement(R.getNameLoc(), 1176 R.getLookupName().getAsString()); 1177 1178 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1179 : VirtualBaseSpec; 1180 Diag(BaseSpec->getSourceRange().getBegin(), 1181 diag::note_base_class_specified_here) 1182 << BaseSpec->getType() 1183 << BaseSpec->getSourceRange(); 1184 1185 TyD = Type; 1186 } 1187 } 1188 } 1189 1190 if (!TyD && BaseType.isNull()) { 1191 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1192 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1193 return true; 1194 } 1195 } 1196 1197 if (BaseType.isNull()) { 1198 BaseType = Context.getTypeDeclType(TyD); 1199 if (SS.isSet()) { 1200 NestedNameSpecifier *Qualifier = 1201 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1202 1203 // FIXME: preserve source range information 1204 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1205 } 1206 } 1207 } 1208 1209 if (!TInfo) 1210 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1211 1212 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1213 LParenLoc, RParenLoc, ClassDecl); 1214} 1215 1216/// Checks an initializer expression for use of uninitialized fields, such as 1217/// containing the field that is being initialized. Returns true if there is an 1218/// uninitialized field was used an updates the SourceLocation parameter; false 1219/// otherwise. 1220static bool InitExprContainsUninitializedFields(const Stmt *S, 1221 const FieldDecl *LhsField, 1222 SourceLocation *L) { 1223 if (isa<CallExpr>(S)) { 1224 // Do not descend into function calls or constructors, as the use 1225 // of an uninitialized field may be valid. One would have to inspect 1226 // the contents of the function/ctor to determine if it is safe or not. 1227 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1228 // may be safe, depending on what the function/ctor does. 1229 return false; 1230 } 1231 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1232 const NamedDecl *RhsField = ME->getMemberDecl(); 1233 if (RhsField == LhsField) { 1234 // Initializing a field with itself. Throw a warning. 1235 // But wait; there are exceptions! 1236 // Exception #1: The field may not belong to this record. 1237 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1238 const Expr *base = ME->getBase(); 1239 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1240 // Even though the field matches, it does not belong to this record. 1241 return false; 1242 } 1243 // None of the exceptions triggered; return true to indicate an 1244 // uninitialized field was used. 1245 *L = ME->getMemberLoc(); 1246 return true; 1247 } 1248 } 1249 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1250 it != e; ++it) { 1251 if (!*it) { 1252 // An expression such as 'member(arg ?: "")' may trigger this. 1253 continue; 1254 } 1255 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1256 return true; 1257 } 1258 return false; 1259} 1260 1261Sema::MemInitResult 1262Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1263 unsigned NumArgs, SourceLocation IdLoc, 1264 SourceLocation LParenLoc, 1265 SourceLocation RParenLoc) { 1266 // Diagnose value-uses of fields to initialize themselves, e.g. 1267 // foo(foo) 1268 // where foo is not also a parameter to the constructor. 1269 // TODO: implement -Wuninitialized and fold this into that framework. 1270 for (unsigned i = 0; i < NumArgs; ++i) { 1271 SourceLocation L; 1272 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1273 // FIXME: Return true in the case when other fields are used before being 1274 // uninitialized. For example, let this field be the i'th field. When 1275 // initializing the i'th field, throw a warning if any of the >= i'th 1276 // fields are used, as they are not yet initialized. 1277 // Right now we are only handling the case where the i'th field uses 1278 // itself in its initializer. 1279 Diag(L, diag::warn_field_is_uninit); 1280 } 1281 } 1282 1283 bool HasDependentArg = false; 1284 for (unsigned i = 0; i < NumArgs; i++) 1285 HasDependentArg |= Args[i]->isTypeDependent(); 1286 1287 QualType FieldType = Member->getType(); 1288 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1289 FieldType = Array->getElementType(); 1290 if (FieldType->isDependentType() || HasDependentArg) { 1291 // Can't check initialization for a member of dependent type or when 1292 // any of the arguments are type-dependent expressions. 1293 OwningExprResult Init 1294 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1295 RParenLoc)); 1296 1297 // Erase any temporaries within this evaluation context; we're not 1298 // going to track them in the AST, since we'll be rebuilding the 1299 // ASTs during template instantiation. 1300 ExprTemporaries.erase( 1301 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1302 ExprTemporaries.end()); 1303 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 1309 } 1310 1311 if (Member->isInvalidDecl()) 1312 return true; 1313 1314 // Initialize the member. 1315 InitializedEntity MemberEntity = 1316 InitializedEntity::InitializeMember(Member, 0); 1317 InitializationKind Kind = 1318 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1319 1320 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1321 1322 OwningExprResult MemberInit = 1323 InitSeq.Perform(*this, MemberEntity, Kind, 1324 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // C++0x [class.base.init]p7: 1329 // The initialization of each base and member constitutes a 1330 // full-expression. 1331 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // If we are in a dependent context, template instantiation will 1336 // perform this type-checking again. Just save the arguments that we 1337 // received in a ParenListExpr. 1338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1339 // of the information that we have about the member 1340 // initializer. However, deconstructing the ASTs is a dicey process, 1341 // and this approach is far more likely to get the corner cases right. 1342 if (CurContext->isDependentContext()) { 1343 // Bump the reference count of all of the arguments. 1344 for (unsigned I = 0; I != NumArgs; ++I) 1345 Args[I]->Retain(); 1346 1347 OwningExprResult Init 1348 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc)); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init.takeAs<Expr>(), 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.takeAs<Expr>(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc 1372 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1373 1374 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1375 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1376 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1377 1378 // C++ [class.base.init]p2: 1379 // [...] Unless the mem-initializer-id names a nonstatic data 1380 // member of the constructor’s class or a direct or virtual base 1381 // of that class, the mem-initializer is ill-formed. A 1382 // mem-initializer-list can initialize a base class using any 1383 // name that denotes that base class type. 1384 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1385 1386 // Check for direct and virtual base classes. 1387 const CXXBaseSpecifier *DirectBaseSpec = 0; 1388 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1389 if (!Dependent) { 1390 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1391 VirtualBaseSpec); 1392 1393 // C++ [base.class.init]p2: 1394 // Unless the mem-initializer-id names a nonstatic data member of the 1395 // constructor's class or a direct or virtual base of that class, the 1396 // mem-initializer is ill-formed. 1397 if (!DirectBaseSpec && !VirtualBaseSpec) { 1398 // If the class has any dependent bases, then it's possible that 1399 // one of those types will resolve to the same type as 1400 // BaseType. Therefore, just treat this as a dependent base 1401 // class initialization. FIXME: Should we try to check the 1402 // initialization anyway? It seems odd. 1403 if (ClassDecl->hasAnyDependentBases()) 1404 Dependent = true; 1405 else 1406 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1407 << BaseType << Context.getTypeDeclType(ClassDecl) 1408 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1409 } 1410 } 1411 1412 if (Dependent) { 1413 // Can't check initialization for a base of dependent type or when 1414 // any of the arguments are type-dependent expressions. 1415 OwningExprResult BaseInit 1416 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1417 RParenLoc)); 1418 1419 // Erase any temporaries within this evaluation context; we're not 1420 // going to track them in the AST, since we'll be rebuilding the 1421 // ASTs during template instantiation. 1422 ExprTemporaries.erase( 1423 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1424 ExprTemporaries.end()); 1425 1426 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1427 /*IsVirtual=*/false, 1428 LParenLoc, 1429 BaseInit.takeAs<Expr>(), 1430 RParenLoc); 1431 } 1432 1433 // C++ [base.class.init]p2: 1434 // If a mem-initializer-id is ambiguous because it designates both 1435 // a direct non-virtual base class and an inherited virtual base 1436 // class, the mem-initializer is ill-formed. 1437 if (DirectBaseSpec && VirtualBaseSpec) 1438 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1439 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1440 1441 CXXBaseSpecifier *BaseSpec 1442 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1443 if (!BaseSpec) 1444 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1445 1446 // Initialize the base. 1447 InitializedEntity BaseEntity = 1448 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1449 InitializationKind Kind = 1450 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1451 1452 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1453 1454 OwningExprResult BaseInit = 1455 InitSeq.Perform(*this, BaseEntity, Kind, 1456 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1457 if (BaseInit.isInvalid()) 1458 return true; 1459 1460 // C++0x [class.base.init]p7: 1461 // The initialization of each base and member constitutes a 1462 // full-expression. 1463 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1464 if (BaseInit.isInvalid()) 1465 return true; 1466 1467 // If we are in a dependent context, template instantiation will 1468 // perform this type-checking again. Just save the arguments that we 1469 // received in a ParenListExpr. 1470 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1471 // of the information that we have about the base 1472 // initializer. However, deconstructing the ASTs is a dicey process, 1473 // and this approach is far more likely to get the corner cases right. 1474 if (CurContext->isDependentContext()) { 1475 // Bump the reference count of all of the arguments. 1476 for (unsigned I = 0; I != NumArgs; ++I) 1477 Args[I]->Retain(); 1478 1479 OwningExprResult Init 1480 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1481 RParenLoc)); 1482 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1483 BaseSpec->isVirtual(), 1484 LParenLoc, 1485 Init.takeAs<Expr>(), 1486 RParenLoc); 1487 } 1488 1489 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1490 BaseSpec->isVirtual(), 1491 LParenLoc, 1492 BaseInit.takeAs<Expr>(), 1493 RParenLoc); 1494} 1495 1496/// ImplicitInitializerKind - How an implicit base or member initializer should 1497/// initialize its base or member. 1498enum ImplicitInitializerKind { 1499 IIK_Default, 1500 IIK_Copy, 1501 IIK_Move 1502}; 1503 1504static bool 1505BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1506 ImplicitInitializerKind ImplicitInitKind, 1507 CXXBaseSpecifier *BaseSpec, 1508 bool IsInheritedVirtualBase, 1509 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1510 InitializedEntity InitEntity 1511 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1512 IsInheritedVirtualBase); 1513 1514 Sema::OwningExprResult BaseInit(SemaRef); 1515 1516 switch (ImplicitInitKind) { 1517 case IIK_Default: { 1518 InitializationKind InitKind 1519 = InitializationKind::CreateDefault(Constructor->getLocation()); 1520 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1521 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1522 Sema::MultiExprArg(SemaRef, 0, 0)); 1523 break; 1524 } 1525 1526 case IIK_Copy: { 1527 ParmVarDecl *Param = Constructor->getParamDecl(0); 1528 QualType ParamType = Param->getType().getNonReferenceType(); 1529 1530 Expr *CopyCtorArg = 1531 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1532 Constructor->getLocation(), ParamType, 0); 1533 1534 // Cast to the base class to avoid ambiguities. 1535 QualType ArgTy = 1536 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1537 ParamType.getQualifiers()); 1538 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1539 CastExpr::CK_UncheckedDerivedToBase, 1540 /*isLvalue=*/true, 1541 CXXBaseSpecifierArray(BaseSpec)); 1542 1543 InitializationKind InitKind 1544 = InitializationKind::CreateDirect(Constructor->getLocation(), 1545 SourceLocation(), SourceLocation()); 1546 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1547 &CopyCtorArg, 1); 1548 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1549 Sema::MultiExprArg(SemaRef, 1550 (void**)&CopyCtorArg, 1)); 1551 break; 1552 } 1553 1554 case IIK_Move: 1555 assert(false && "Unhandled initializer kind!"); 1556 } 1557 1558 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1559 if (BaseInit.isInvalid()) 1560 return true; 1561 1562 CXXBaseInit = 1563 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1564 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1565 SourceLocation()), 1566 BaseSpec->isVirtual(), 1567 SourceLocation(), 1568 BaseInit.takeAs<Expr>(), 1569 SourceLocation()); 1570 1571 return false; 1572} 1573 1574static bool 1575BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1576 ImplicitInitializerKind ImplicitInitKind, 1577 FieldDecl *Field, 1578 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1579 if (Field->isInvalidDecl()) 1580 return true; 1581 1582 if (ImplicitInitKind == IIK_Copy) { 1583 SourceLocation Loc = Constructor->getLocation(); 1584 ParmVarDecl *Param = Constructor->getParamDecl(0); 1585 QualType ParamType = Param->getType().getNonReferenceType(); 1586 1587 Expr *MemberExprBase = 1588 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1589 Loc, ParamType, 0); 1590 1591 // Build a reference to this field within the parameter. 1592 CXXScopeSpec SS; 1593 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1594 Sema::LookupMemberName); 1595 MemberLookup.addDecl(Field, AS_public); 1596 MemberLookup.resolveKind(); 1597 Sema::OwningExprResult CopyCtorArg 1598 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1599 ParamType, Loc, 1600 /*IsArrow=*/false, 1601 SS, 1602 /*FirstQualifierInScope=*/0, 1603 MemberLookup, 1604 /*TemplateArgs=*/0); 1605 if (CopyCtorArg.isInvalid()) 1606 return true; 1607 1608 // When the field we are copying is an array, create index variables for 1609 // each dimension of the array. We use these index variables to subscript 1610 // the source array, and other clients (e.g., CodeGen) will perform the 1611 // necessary iteration with these index variables. 1612 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1613 QualType BaseType = Field->getType(); 1614 QualType SizeType = SemaRef.Context.getSizeType(); 1615 while (const ConstantArrayType *Array 1616 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1617 // Create the iteration variable for this array index. 1618 IdentifierInfo *IterationVarName = 0; 1619 { 1620 llvm::SmallString<8> Str; 1621 llvm::raw_svector_ostream OS(Str); 1622 OS << "__i" << IndexVariables.size(); 1623 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1624 } 1625 VarDecl *IterationVar 1626 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1627 IterationVarName, SizeType, 1628 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1629 VarDecl::None, VarDecl::None); 1630 IndexVariables.push_back(IterationVar); 1631 1632 // Create a reference to the iteration variable. 1633 Sema::OwningExprResult IterationVarRef 1634 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1635 assert(!IterationVarRef.isInvalid() && 1636 "Reference to invented variable cannot fail!"); 1637 1638 // Subscript the array with this iteration variable. 1639 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1640 Loc, 1641 move(IterationVarRef), 1642 Loc); 1643 if (CopyCtorArg.isInvalid()) 1644 return true; 1645 1646 BaseType = Array->getElementType(); 1647 } 1648 1649 // Construct the entity that we will be initializing. For an array, this 1650 // will be first element in the array, which may require several levels 1651 // of array-subscript entities. 1652 llvm::SmallVector<InitializedEntity, 4> Entities; 1653 Entities.reserve(1 + IndexVariables.size()); 1654 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1655 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1656 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1657 0, 1658 Entities.back())); 1659 1660 // Direct-initialize to use the copy constructor. 1661 InitializationKind InitKind = 1662 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1663 1664 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1665 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1666 &CopyCtorArgE, 1); 1667 1668 Sema::OwningExprResult MemberInit 1669 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1670 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1671 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1672 if (MemberInit.isInvalid()) 1673 return true; 1674 1675 CXXMemberInit 1676 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1677 MemberInit.takeAs<Expr>(), Loc, 1678 IndexVariables.data(), 1679 IndexVariables.size()); 1680 return false; 1681 } 1682 1683 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1684 1685 QualType FieldBaseElementType = 1686 SemaRef.Context.getBaseElementType(Field->getType()); 1687 1688 if (FieldBaseElementType->isRecordType()) { 1689 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1690 InitializationKind InitKind = 1691 InitializationKind::CreateDefault(Constructor->getLocation()); 1692 1693 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1694 Sema::OwningExprResult MemberInit = 1695 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1696 Sema::MultiExprArg(SemaRef, 0, 0)); 1697 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1698 if (MemberInit.isInvalid()) 1699 return true; 1700 1701 CXXMemberInit = 1702 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1703 Field, SourceLocation(), 1704 SourceLocation(), 1705 MemberInit.takeAs<Expr>(), 1706 SourceLocation()); 1707 return false; 1708 } 1709 1710 if (FieldBaseElementType->isReferenceType()) { 1711 SemaRef.Diag(Constructor->getLocation(), 1712 diag::err_uninitialized_member_in_ctor) 1713 << (int)Constructor->isImplicit() 1714 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1715 << 0 << Field->getDeclName(); 1716 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1717 return true; 1718 } 1719 1720 if (FieldBaseElementType.isConstQualified()) { 1721 SemaRef.Diag(Constructor->getLocation(), 1722 diag::err_uninitialized_member_in_ctor) 1723 << (int)Constructor->isImplicit() 1724 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1725 << 1 << Field->getDeclName(); 1726 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1727 return true; 1728 } 1729 1730 // Nothing to initialize. 1731 CXXMemberInit = 0; 1732 return false; 1733} 1734 1735namespace { 1736struct BaseAndFieldInfo { 1737 Sema &S; 1738 CXXConstructorDecl *Ctor; 1739 bool AnyErrorsInInits; 1740 ImplicitInitializerKind IIK; 1741 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1742 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1743 1744 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1745 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1746 // FIXME: Handle implicit move constructors. 1747 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1748 IIK = IIK_Copy; 1749 else 1750 IIK = IIK_Default; 1751 } 1752}; 1753} 1754 1755static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1756 FieldDecl *Top, FieldDecl *Field) { 1757 1758 // Overwhelmingly common case: we have a direct initializer for this field. 1759 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1760 Info.AllToInit.push_back(Init); 1761 1762 if (Field != Top) { 1763 Init->setMember(Top); 1764 Init->setAnonUnionMember(Field); 1765 } 1766 return false; 1767 } 1768 1769 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1770 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1771 assert(FieldClassType && "anonymous struct/union without record type"); 1772 1773 // Walk through the members, tying in any initializers for fields 1774 // we find. The earlier semantic checks should prevent redundant 1775 // initialization of union members, given the requirement that 1776 // union members never have non-trivial default constructors. 1777 1778 // TODO: in C++0x, it might be legal to have union members with 1779 // non-trivial default constructors in unions. Revise this 1780 // implementation then with the appropriate semantics. 1781 CXXRecordDecl *FieldClassDecl 1782 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1783 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1784 EA = FieldClassDecl->field_end(); FA != EA; FA++) 1785 if (CollectFieldInitializer(Info, Top, *FA)) 1786 return true; 1787 } 1788 1789 // Don't try to build an implicit initializer if there were semantic 1790 // errors in any of the initializers (and therefore we might be 1791 // missing some that the user actually wrote). 1792 if (Info.AnyErrorsInInits) 1793 return false; 1794 1795 CXXBaseOrMemberInitializer *Init = 0; 1796 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1797 return true; 1798 1799 // If the member doesn't need to be initialized, Init will still be null. 1800 if (!Init) return false; 1801 1802 Info.AllToInit.push_back(Init); 1803 if (Top != Field) { 1804 Init->setMember(Top); 1805 Init->setAnonUnionMember(Field); 1806 } 1807 return false; 1808} 1809 1810bool 1811Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1812 CXXBaseOrMemberInitializer **Initializers, 1813 unsigned NumInitializers, 1814 bool AnyErrors) { 1815 if (Constructor->getDeclContext()->isDependentContext()) { 1816 // Just store the initializers as written, they will be checked during 1817 // instantiation. 1818 if (NumInitializers > 0) { 1819 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1820 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1821 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1822 memcpy(baseOrMemberInitializers, Initializers, 1823 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1824 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1825 } 1826 1827 return false; 1828 } 1829 1830 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1831 1832 // We need to build the initializer AST according to order of construction 1833 // and not what user specified in the Initializers list. 1834 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1835 if (!ClassDecl) 1836 return true; 1837 1838 bool HadError = false; 1839 1840 for (unsigned i = 0; i < NumInitializers; i++) { 1841 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1842 1843 if (Member->isBaseInitializer()) 1844 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1845 else 1846 Info.AllBaseFields[Member->getMember()] = Member; 1847 } 1848 1849 // Keep track of the direct virtual bases. 1850 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1851 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1852 E = ClassDecl->bases_end(); I != E; ++I) { 1853 if (I->isVirtual()) 1854 DirectVBases.insert(I); 1855 } 1856 1857 // Push virtual bases before others. 1858 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1859 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1860 1861 if (CXXBaseOrMemberInitializer *Value 1862 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1863 Info.AllToInit.push_back(Value); 1864 } else if (!AnyErrors) { 1865 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1866 CXXBaseOrMemberInitializer *CXXBaseInit; 1867 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1868 VBase, IsInheritedVirtualBase, 1869 CXXBaseInit)) { 1870 HadError = true; 1871 continue; 1872 } 1873 1874 Info.AllToInit.push_back(CXXBaseInit); 1875 } 1876 } 1877 1878 // Non-virtual bases. 1879 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1880 E = ClassDecl->bases_end(); Base != E; ++Base) { 1881 // Virtuals are in the virtual base list and already constructed. 1882 if (Base->isVirtual()) 1883 continue; 1884 1885 if (CXXBaseOrMemberInitializer *Value 1886 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1887 Info.AllToInit.push_back(Value); 1888 } else if (!AnyErrors) { 1889 CXXBaseOrMemberInitializer *CXXBaseInit; 1890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1891 Base, /*IsInheritedVirtualBase=*/false, 1892 CXXBaseInit)) { 1893 HadError = true; 1894 continue; 1895 } 1896 1897 Info.AllToInit.push_back(CXXBaseInit); 1898 } 1899 } 1900 1901 // Fields. 1902 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1903 E = ClassDecl->field_end(); Field != E; ++Field) { 1904 if ((*Field)->getType()->isIncompleteArrayType()) { 1905 assert(ClassDecl->hasFlexibleArrayMember() && 1906 "Incomplete array type is not valid"); 1907 continue; 1908 } 1909 if (CollectFieldInitializer(Info, *Field, *Field)) 1910 HadError = true; 1911 } 1912 1913 NumInitializers = Info.AllToInit.size(); 1914 if (NumInitializers > 0) { 1915 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1916 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1917 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1918 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1919 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1920 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1921 1922 // Constructors implicitly reference the base and member 1923 // destructors. 1924 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1925 Constructor->getParent()); 1926 } 1927 1928 return HadError; 1929} 1930 1931static void *GetKeyForTopLevelField(FieldDecl *Field) { 1932 // For anonymous unions, use the class declaration as the key. 1933 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1934 if (RT->getDecl()->isAnonymousStructOrUnion()) 1935 return static_cast<void *>(RT->getDecl()); 1936 } 1937 return static_cast<void *>(Field); 1938} 1939 1940static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1941 return Context.getCanonicalType(BaseType).getTypePtr(); 1942} 1943 1944static void *GetKeyForMember(ASTContext &Context, 1945 CXXBaseOrMemberInitializer *Member, 1946 bool MemberMaybeAnon = false) { 1947 if (!Member->isMemberInitializer()) 1948 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1949 1950 // For fields injected into the class via declaration of an anonymous union, 1951 // use its anonymous union class declaration as the unique key. 1952 FieldDecl *Field = Member->getMember(); 1953 1954 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1955 // data member of the class. Data member used in the initializer list is 1956 // in AnonUnionMember field. 1957 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1958 Field = Member->getAnonUnionMember(); 1959 1960 // If the field is a member of an anonymous struct or union, our key 1961 // is the anonymous record decl that's a direct child of the class. 1962 RecordDecl *RD = Field->getParent(); 1963 if (RD->isAnonymousStructOrUnion()) { 1964 while (true) { 1965 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1966 if (Parent->isAnonymousStructOrUnion()) 1967 RD = Parent; 1968 else 1969 break; 1970 } 1971 1972 return static_cast<void *>(RD); 1973 } 1974 1975 return static_cast<void *>(Field); 1976} 1977 1978static void 1979DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1980 const CXXConstructorDecl *Constructor, 1981 CXXBaseOrMemberInitializer **Inits, 1982 unsigned NumInits) { 1983 if (Constructor->getDeclContext()->isDependentContext()) 1984 return; 1985 1986 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1987 == Diagnostic::Ignored) 1988 return; 1989 1990 // Build the list of bases and members in the order that they'll 1991 // actually be initialized. The explicit initializers should be in 1992 // this same order but may be missing things. 1993 llvm::SmallVector<const void*, 32> IdealInitKeys; 1994 1995 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1996 1997 // 1. Virtual bases. 1998 for (CXXRecordDecl::base_class_const_iterator VBase = 1999 ClassDecl->vbases_begin(), 2000 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2001 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2002 2003 // 2. Non-virtual bases. 2004 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2005 E = ClassDecl->bases_end(); Base != E; ++Base) { 2006 if (Base->isVirtual()) 2007 continue; 2008 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2009 } 2010 2011 // 3. Direct fields. 2012 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2013 E = ClassDecl->field_end(); Field != E; ++Field) 2014 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2015 2016 unsigned NumIdealInits = IdealInitKeys.size(); 2017 unsigned IdealIndex = 0; 2018 2019 CXXBaseOrMemberInitializer *PrevInit = 0; 2020 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2021 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2022 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2023 2024 // Scan forward to try to find this initializer in the idealized 2025 // initializers list. 2026 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2027 if (InitKey == IdealInitKeys[IdealIndex]) 2028 break; 2029 2030 // If we didn't find this initializer, it must be because we 2031 // scanned past it on a previous iteration. That can only 2032 // happen if we're out of order; emit a warning. 2033 if (IdealIndex == NumIdealInits && PrevInit) { 2034 Sema::SemaDiagnosticBuilder D = 2035 SemaRef.Diag(PrevInit->getSourceLocation(), 2036 diag::warn_initializer_out_of_order); 2037 2038 if (PrevInit->isMemberInitializer()) 2039 D << 0 << PrevInit->getMember()->getDeclName(); 2040 else 2041 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2042 2043 if (Init->isMemberInitializer()) 2044 D << 0 << Init->getMember()->getDeclName(); 2045 else 2046 D << 1 << Init->getBaseClassInfo()->getType(); 2047 2048 // Move back to the initializer's location in the ideal list. 2049 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2050 if (InitKey == IdealInitKeys[IdealIndex]) 2051 break; 2052 2053 assert(IdealIndex != NumIdealInits && 2054 "initializer not found in initializer list"); 2055 } 2056 2057 PrevInit = Init; 2058 } 2059} 2060 2061namespace { 2062bool CheckRedundantInit(Sema &S, 2063 CXXBaseOrMemberInitializer *Init, 2064 CXXBaseOrMemberInitializer *&PrevInit) { 2065 if (!PrevInit) { 2066 PrevInit = Init; 2067 return false; 2068 } 2069 2070 if (FieldDecl *Field = Init->getMember()) 2071 S.Diag(Init->getSourceLocation(), 2072 diag::err_multiple_mem_initialization) 2073 << Field->getDeclName() 2074 << Init->getSourceRange(); 2075 else { 2076 Type *BaseClass = Init->getBaseClass(); 2077 assert(BaseClass && "neither field nor base"); 2078 S.Diag(Init->getSourceLocation(), 2079 diag::err_multiple_base_initialization) 2080 << QualType(BaseClass, 0) 2081 << Init->getSourceRange(); 2082 } 2083 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2084 << 0 << PrevInit->getSourceRange(); 2085 2086 return true; 2087} 2088 2089typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2090typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2091 2092bool CheckRedundantUnionInit(Sema &S, 2093 CXXBaseOrMemberInitializer *Init, 2094 RedundantUnionMap &Unions) { 2095 FieldDecl *Field = Init->getMember(); 2096 RecordDecl *Parent = Field->getParent(); 2097 if (!Parent->isAnonymousStructOrUnion()) 2098 return false; 2099 2100 NamedDecl *Child = Field; 2101 do { 2102 if (Parent->isUnion()) { 2103 UnionEntry &En = Unions[Parent]; 2104 if (En.first && En.first != Child) { 2105 S.Diag(Init->getSourceLocation(), 2106 diag::err_multiple_mem_union_initialization) 2107 << Field->getDeclName() 2108 << Init->getSourceRange(); 2109 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2110 << 0 << En.second->getSourceRange(); 2111 return true; 2112 } else if (!En.first) { 2113 En.first = Child; 2114 En.second = Init; 2115 } 2116 } 2117 2118 Child = Parent; 2119 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2120 } while (Parent->isAnonymousStructOrUnion()); 2121 2122 return false; 2123} 2124} 2125 2126/// ActOnMemInitializers - Handle the member initializers for a constructor. 2127void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2128 SourceLocation ColonLoc, 2129 MemInitTy **meminits, unsigned NumMemInits, 2130 bool AnyErrors) { 2131 if (!ConstructorDecl) 2132 return; 2133 2134 AdjustDeclIfTemplate(ConstructorDecl); 2135 2136 CXXConstructorDecl *Constructor 2137 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2138 2139 if (!Constructor) { 2140 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2141 return; 2142 } 2143 2144 CXXBaseOrMemberInitializer **MemInits = 2145 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2146 2147 // Mapping for the duplicate initializers check. 2148 // For member initializers, this is keyed with a FieldDecl*. 2149 // For base initializers, this is keyed with a Type*. 2150 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2151 2152 // Mapping for the inconsistent anonymous-union initializers check. 2153 RedundantUnionMap MemberUnions; 2154 2155 bool HadError = false; 2156 for (unsigned i = 0; i < NumMemInits; i++) { 2157 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2158 2159 // Set the source order index. 2160 Init->setSourceOrder(i); 2161 2162 if (Init->isMemberInitializer()) { 2163 FieldDecl *Field = Init->getMember(); 2164 if (CheckRedundantInit(*this, Init, Members[Field]) || 2165 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2166 HadError = true; 2167 } else { 2168 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2169 if (CheckRedundantInit(*this, Init, Members[Key])) 2170 HadError = true; 2171 } 2172 } 2173 2174 if (HadError) 2175 return; 2176 2177 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2178 2179 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2180} 2181 2182void 2183Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2184 CXXRecordDecl *ClassDecl) { 2185 // Ignore dependent contexts. 2186 if (ClassDecl->isDependentContext()) 2187 return; 2188 2189 // FIXME: all the access-control diagnostics are positioned on the 2190 // field/base declaration. That's probably good; that said, the 2191 // user might reasonably want to know why the destructor is being 2192 // emitted, and we currently don't say. 2193 2194 // Non-static data members. 2195 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2196 E = ClassDecl->field_end(); I != E; ++I) { 2197 FieldDecl *Field = *I; 2198 if (Field->isInvalidDecl()) 2199 continue; 2200 QualType FieldType = Context.getBaseElementType(Field->getType()); 2201 2202 const RecordType* RT = FieldType->getAs<RecordType>(); 2203 if (!RT) 2204 continue; 2205 2206 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2207 if (FieldClassDecl->hasTrivialDestructor()) 2208 continue; 2209 2210 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2211 CheckDestructorAccess(Field->getLocation(), Dtor, 2212 PDiag(diag::err_access_dtor_field) 2213 << Field->getDeclName() 2214 << FieldType); 2215 2216 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2217 } 2218 2219 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2220 2221 // Bases. 2222 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2223 E = ClassDecl->bases_end(); Base != E; ++Base) { 2224 // Bases are always records in a well-formed non-dependent class. 2225 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2226 2227 // Remember direct virtual bases. 2228 if (Base->isVirtual()) 2229 DirectVirtualBases.insert(RT); 2230 2231 // Ignore trivial destructors. 2232 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2233 if (BaseClassDecl->hasTrivialDestructor()) 2234 continue; 2235 2236 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2237 2238 // FIXME: caret should be on the start of the class name 2239 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2240 PDiag(diag::err_access_dtor_base) 2241 << Base->getType() 2242 << Base->getSourceRange()); 2243 2244 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2245 } 2246 2247 // Virtual bases. 2248 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2249 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2250 2251 // Bases are always records in a well-formed non-dependent class. 2252 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2253 2254 // Ignore direct virtual bases. 2255 if (DirectVirtualBases.count(RT)) 2256 continue; 2257 2258 // Ignore trivial destructors. 2259 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2260 if (BaseClassDecl->hasTrivialDestructor()) 2261 continue; 2262 2263 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2264 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2265 PDiag(diag::err_access_dtor_vbase) 2266 << VBase->getType()); 2267 2268 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2269 } 2270} 2271 2272void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2273 if (!CDtorDecl) 2274 return; 2275 2276 if (CXXConstructorDecl *Constructor 2277 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2278 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2279} 2280 2281bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2282 unsigned DiagID, AbstractDiagSelID SelID, 2283 const CXXRecordDecl *CurrentRD) { 2284 if (SelID == -1) 2285 return RequireNonAbstractType(Loc, T, 2286 PDiag(DiagID), CurrentRD); 2287 else 2288 return RequireNonAbstractType(Loc, T, 2289 PDiag(DiagID) << SelID, CurrentRD); 2290} 2291 2292bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2293 const PartialDiagnostic &PD, 2294 const CXXRecordDecl *CurrentRD) { 2295 if (!getLangOptions().CPlusPlus) 2296 return false; 2297 2298 if (const ArrayType *AT = Context.getAsArrayType(T)) 2299 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2300 CurrentRD); 2301 2302 if (const PointerType *PT = T->getAs<PointerType>()) { 2303 // Find the innermost pointer type. 2304 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2305 PT = T; 2306 2307 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2308 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2309 } 2310 2311 const RecordType *RT = T->getAs<RecordType>(); 2312 if (!RT) 2313 return false; 2314 2315 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2316 2317 if (CurrentRD && CurrentRD != RD) 2318 return false; 2319 2320 // FIXME: is this reasonable? It matches current behavior, but.... 2321 if (!RD->getDefinition()) 2322 return false; 2323 2324 if (!RD->isAbstract()) 2325 return false; 2326 2327 Diag(Loc, PD) << RD->getDeclName(); 2328 2329 // Check if we've already emitted the list of pure virtual functions for this 2330 // class. 2331 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2332 return true; 2333 2334 CXXFinalOverriderMap FinalOverriders; 2335 RD->getFinalOverriders(FinalOverriders); 2336 2337 // Keep a set of seen pure methods so we won't diagnose the same method 2338 // more than once. 2339 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2340 2341 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2342 MEnd = FinalOverriders.end(); 2343 M != MEnd; 2344 ++M) { 2345 for (OverridingMethods::iterator SO = M->second.begin(), 2346 SOEnd = M->second.end(); 2347 SO != SOEnd; ++SO) { 2348 // C++ [class.abstract]p4: 2349 // A class is abstract if it contains or inherits at least one 2350 // pure virtual function for which the final overrider is pure 2351 // virtual. 2352 2353 // 2354 if (SO->second.size() != 1) 2355 continue; 2356 2357 if (!SO->second.front().Method->isPure()) 2358 continue; 2359 2360 if (!SeenPureMethods.insert(SO->second.front().Method)) 2361 continue; 2362 2363 Diag(SO->second.front().Method->getLocation(), 2364 diag::note_pure_virtual_function) 2365 << SO->second.front().Method->getDeclName(); 2366 } 2367 } 2368 2369 if (!PureVirtualClassDiagSet) 2370 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2371 PureVirtualClassDiagSet->insert(RD); 2372 2373 return true; 2374} 2375 2376namespace { 2377 class AbstractClassUsageDiagnoser 2378 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2379 Sema &SemaRef; 2380 CXXRecordDecl *AbstractClass; 2381 2382 bool VisitDeclContext(const DeclContext *DC) { 2383 bool Invalid = false; 2384 2385 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2386 E = DC->decls_end(); I != E; ++I) 2387 Invalid |= Visit(*I); 2388 2389 return Invalid; 2390 } 2391 2392 public: 2393 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2394 : SemaRef(SemaRef), AbstractClass(ac) { 2395 Visit(SemaRef.Context.getTranslationUnitDecl()); 2396 } 2397 2398 bool VisitFunctionDecl(const FunctionDecl *FD) { 2399 if (FD->isThisDeclarationADefinition()) { 2400 // No need to do the check if we're in a definition, because it requires 2401 // that the return/param types are complete. 2402 // because that requires 2403 return VisitDeclContext(FD); 2404 } 2405 2406 // Check the return type. 2407 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2408 bool Invalid = 2409 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2410 diag::err_abstract_type_in_decl, 2411 Sema::AbstractReturnType, 2412 AbstractClass); 2413 2414 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2415 E = FD->param_end(); I != E; ++I) { 2416 const ParmVarDecl *VD = *I; 2417 Invalid |= 2418 SemaRef.RequireNonAbstractType(VD->getLocation(), 2419 VD->getOriginalType(), 2420 diag::err_abstract_type_in_decl, 2421 Sema::AbstractParamType, 2422 AbstractClass); 2423 } 2424 2425 return Invalid; 2426 } 2427 2428 bool VisitDecl(const Decl* D) { 2429 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2430 return VisitDeclContext(DC); 2431 2432 return false; 2433 } 2434 }; 2435} 2436 2437/// \brief Perform semantic checks on a class definition that has been 2438/// completing, introducing implicitly-declared members, checking for 2439/// abstract types, etc. 2440void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2441 if (!Record || Record->isInvalidDecl()) 2442 return; 2443 2444 if (!Record->isDependentType()) 2445 AddImplicitlyDeclaredMembersToClass(S, Record); 2446 2447 if (Record->isInvalidDecl()) 2448 return; 2449 2450 // Set access bits correctly on the directly-declared conversions. 2451 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2452 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2453 Convs->setAccess(I, (*I)->getAccess()); 2454 2455 // Determine whether we need to check for final overriders. We do 2456 // this either when there are virtual base classes (in which case we 2457 // may end up finding multiple final overriders for a given virtual 2458 // function) or any of the base classes is abstract (in which case 2459 // we might detect that this class is abstract). 2460 bool CheckFinalOverriders = false; 2461 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2462 !Record->isDependentType()) { 2463 if (Record->getNumVBases()) 2464 CheckFinalOverriders = true; 2465 else if (!Record->isAbstract()) { 2466 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2467 BEnd = Record->bases_end(); 2468 B != BEnd; ++B) { 2469 CXXRecordDecl *BaseDecl 2470 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2471 if (BaseDecl->isAbstract()) { 2472 CheckFinalOverriders = true; 2473 break; 2474 } 2475 } 2476 } 2477 } 2478 2479 if (CheckFinalOverriders) { 2480 CXXFinalOverriderMap FinalOverriders; 2481 Record->getFinalOverriders(FinalOverriders); 2482 2483 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2484 MEnd = FinalOverriders.end(); 2485 M != MEnd; ++M) { 2486 for (OverridingMethods::iterator SO = M->second.begin(), 2487 SOEnd = M->second.end(); 2488 SO != SOEnd; ++SO) { 2489 assert(SO->second.size() > 0 && 2490 "All virtual functions have overridding virtual functions"); 2491 if (SO->second.size() == 1) { 2492 // C++ [class.abstract]p4: 2493 // A class is abstract if it contains or inherits at least one 2494 // pure virtual function for which the final overrider is pure 2495 // virtual. 2496 if (SO->second.front().Method->isPure()) 2497 Record->setAbstract(true); 2498 continue; 2499 } 2500 2501 // C++ [class.virtual]p2: 2502 // In a derived class, if a virtual member function of a base 2503 // class subobject has more than one final overrider the 2504 // program is ill-formed. 2505 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2506 << (NamedDecl *)M->first << Record; 2507 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2508 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2509 OMEnd = SO->second.end(); 2510 OM != OMEnd; ++OM) 2511 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2512 << (NamedDecl *)M->first << OM->Method->getParent(); 2513 2514 Record->setInvalidDecl(); 2515 } 2516 } 2517 } 2518 2519 if (Record->isAbstract() && !Record->isInvalidDecl()) 2520 (void)AbstractClassUsageDiagnoser(*this, Record); 2521 2522 // If this is not an aggregate type and has no user-declared constructor, 2523 // complain about any non-static data members of reference or const scalar 2524 // type, since they will never get initializers. 2525 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2526 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2527 bool Complained = false; 2528 for (RecordDecl::field_iterator F = Record->field_begin(), 2529 FEnd = Record->field_end(); 2530 F != FEnd; ++F) { 2531 if (F->getType()->isReferenceType() || 2532 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2533 if (!Complained) { 2534 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2535 << Record->getTagKind() << Record; 2536 Complained = true; 2537 } 2538 2539 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2540 << F->getType()->isReferenceType() 2541 << F->getDeclName(); 2542 } 2543 } 2544 } 2545 2546 if (Record->isDynamicClass()) 2547 DynamicClasses.push_back(Record); 2548} 2549 2550void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2551 DeclPtrTy TagDecl, 2552 SourceLocation LBrac, 2553 SourceLocation RBrac, 2554 AttributeList *AttrList) { 2555 if (!TagDecl) 2556 return; 2557 2558 AdjustDeclIfTemplate(TagDecl); 2559 2560 ActOnFields(S, RLoc, TagDecl, 2561 (DeclPtrTy*)FieldCollector->getCurFields(), 2562 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2563 2564 CheckCompletedCXXClass(S, 2565 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2566} 2567 2568/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2569/// special functions, such as the default constructor, copy 2570/// constructor, or destructor, to the given C++ class (C++ 2571/// [special]p1). This routine can only be executed just before the 2572/// definition of the class is complete. 2573/// 2574/// The scope, if provided, is the class scope. 2575void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2576 CXXRecordDecl *ClassDecl) { 2577 CanQualType ClassType 2578 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2579 2580 // FIXME: Implicit declarations have exception specifications, which are 2581 // the union of the specifications of the implicitly called functions. 2582 2583 if (!ClassDecl->hasUserDeclaredConstructor()) { 2584 // C++ [class.ctor]p5: 2585 // A default constructor for a class X is a constructor of class X 2586 // that can be called without an argument. If there is no 2587 // user-declared constructor for class X, a default constructor is 2588 // implicitly declared. An implicitly-declared default constructor 2589 // is an inline public member of its class. 2590 DeclarationName Name 2591 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2592 CXXConstructorDecl *DefaultCon = 2593 CXXConstructorDecl::Create(Context, ClassDecl, 2594 ClassDecl->getLocation(), Name, 2595 Context.getFunctionType(Context.VoidTy, 2596 0, 0, false, 0, 2597 /*FIXME*/false, false, 2598 0, 0, 2599 FunctionType::ExtInfo()), 2600 /*TInfo=*/0, 2601 /*isExplicit=*/false, 2602 /*isInline=*/true, 2603 /*isImplicitlyDeclared=*/true); 2604 DefaultCon->setAccess(AS_public); 2605 DefaultCon->setImplicit(); 2606 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2607 if (S) 2608 PushOnScopeChains(DefaultCon, S, true); 2609 else 2610 ClassDecl->addDecl(DefaultCon); 2611 } 2612 2613 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2614 // C++ [class.copy]p4: 2615 // If the class definition does not explicitly declare a copy 2616 // constructor, one is declared implicitly. 2617 2618 // C++ [class.copy]p5: 2619 // The implicitly-declared copy constructor for a class X will 2620 // have the form 2621 // 2622 // X::X(const X&) 2623 // 2624 // if 2625 bool HasConstCopyConstructor = true; 2626 2627 // -- each direct or virtual base class B of X has a copy 2628 // constructor whose first parameter is of type const B& or 2629 // const volatile B&, and 2630 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2631 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2632 const CXXRecordDecl *BaseClassDecl 2633 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2634 HasConstCopyConstructor 2635 = BaseClassDecl->hasConstCopyConstructor(Context); 2636 } 2637 2638 // -- for all the nonstatic data members of X that are of a 2639 // class type M (or array thereof), each such class type 2640 // has a copy constructor whose first parameter is of type 2641 // const M& or const volatile M&. 2642 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2643 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2644 ++Field) { 2645 QualType FieldType = (*Field)->getType(); 2646 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2647 FieldType = Array->getElementType(); 2648 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2649 const CXXRecordDecl *FieldClassDecl 2650 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2651 HasConstCopyConstructor 2652 = FieldClassDecl->hasConstCopyConstructor(Context); 2653 } 2654 } 2655 2656 // Otherwise, the implicitly declared copy constructor will have 2657 // the form 2658 // 2659 // X::X(X&) 2660 QualType ArgType = ClassType; 2661 if (HasConstCopyConstructor) 2662 ArgType = ArgType.withConst(); 2663 ArgType = Context.getLValueReferenceType(ArgType); 2664 2665 // An implicitly-declared copy constructor is an inline public 2666 // member of its class. 2667 DeclarationName Name 2668 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2669 CXXConstructorDecl *CopyConstructor 2670 = CXXConstructorDecl::Create(Context, ClassDecl, 2671 ClassDecl->getLocation(), Name, 2672 Context.getFunctionType(Context.VoidTy, 2673 &ArgType, 1, 2674 false, 0, 2675 /*FIXME: hasExceptionSpec*/false, 2676 false, 0, 0, 2677 FunctionType::ExtInfo()), 2678 /*TInfo=*/0, 2679 /*isExplicit=*/false, 2680 /*isInline=*/true, 2681 /*isImplicitlyDeclared=*/true); 2682 CopyConstructor->setAccess(AS_public); 2683 CopyConstructor->setImplicit(); 2684 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2685 2686 // Add the parameter to the constructor. 2687 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2688 ClassDecl->getLocation(), 2689 /*IdentifierInfo=*/0, 2690 ArgType, /*TInfo=*/0, 2691 VarDecl::None, 2692 VarDecl::None, 0); 2693 CopyConstructor->setParams(&FromParam, 1); 2694 if (S) 2695 PushOnScopeChains(CopyConstructor, S, true); 2696 else 2697 ClassDecl->addDecl(CopyConstructor); 2698 } 2699 2700 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2701 // Note: The following rules are largely analoguous to the copy 2702 // constructor rules. Note that virtual bases are not taken into account 2703 // for determining the argument type of the operator. Note also that 2704 // operators taking an object instead of a reference are allowed. 2705 // 2706 // C++ [class.copy]p10: 2707 // If the class definition does not explicitly declare a copy 2708 // assignment operator, one is declared implicitly. 2709 // The implicitly-defined copy assignment operator for a class X 2710 // will have the form 2711 // 2712 // X& X::operator=(const X&) 2713 // 2714 // if 2715 bool HasConstCopyAssignment = true; 2716 2717 // -- each direct base class B of X has a copy assignment operator 2718 // whose parameter is of type const B&, const volatile B& or B, 2719 // and 2720 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2721 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2722 assert(!Base->getType()->isDependentType() && 2723 "Cannot generate implicit members for class with dependent bases."); 2724 const CXXRecordDecl *BaseClassDecl 2725 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2726 const CXXMethodDecl *MD = 0; 2727 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2728 MD); 2729 } 2730 2731 // -- for all the nonstatic data members of X that are of a class 2732 // type M (or array thereof), each such class type has a copy 2733 // assignment operator whose parameter is of type const M&, 2734 // const volatile M& or M. 2735 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2736 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2737 ++Field) { 2738 QualType FieldType = (*Field)->getType(); 2739 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2740 FieldType = Array->getElementType(); 2741 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2742 const CXXRecordDecl *FieldClassDecl 2743 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2744 const CXXMethodDecl *MD = 0; 2745 HasConstCopyAssignment 2746 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2747 } 2748 } 2749 2750 // Otherwise, the implicitly declared copy assignment operator will 2751 // have the form 2752 // 2753 // X& X::operator=(X&) 2754 QualType ArgType = ClassType; 2755 QualType RetType = Context.getLValueReferenceType(ArgType); 2756 if (HasConstCopyAssignment) 2757 ArgType = ArgType.withConst(); 2758 ArgType = Context.getLValueReferenceType(ArgType); 2759 2760 // An implicitly-declared copy assignment operator is an inline public 2761 // member of its class. 2762 DeclarationName Name = 2763 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2764 CXXMethodDecl *CopyAssignment = 2765 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2766 Context.getFunctionType(RetType, &ArgType, 1, 2767 false, 0, 2768 /*FIXME: hasExceptionSpec*/false, 2769 false, 0, 0, 2770 FunctionType::ExtInfo()), 2771 /*TInfo=*/0, /*isStatic=*/false, 2772 /*StorageClassAsWritten=*/FunctionDecl::None, 2773 /*isInline=*/true); 2774 CopyAssignment->setAccess(AS_public); 2775 CopyAssignment->setImplicit(); 2776 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2777 CopyAssignment->setCopyAssignment(true); 2778 2779 // Add the parameter to the operator. 2780 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2781 ClassDecl->getLocation(), 2782 /*Id=*/0, 2783 ArgType, /*TInfo=*/0, 2784 VarDecl::None, 2785 VarDecl::None, 0); 2786 CopyAssignment->setParams(&FromParam, 1); 2787 2788 // Don't call addedAssignmentOperator. There is no way to distinguish an 2789 // implicit from an explicit assignment operator. 2790 if (S) 2791 PushOnScopeChains(CopyAssignment, S, true); 2792 else 2793 ClassDecl->addDecl(CopyAssignment); 2794 AddOverriddenMethods(ClassDecl, CopyAssignment); 2795 } 2796 2797 if (!ClassDecl->hasUserDeclaredDestructor()) { 2798 // C++ [class.dtor]p2: 2799 // If a class has no user-declared destructor, a destructor is 2800 // declared implicitly. An implicitly-declared destructor is an 2801 // inline public member of its class. 2802 QualType Ty = Context.getFunctionType(Context.VoidTy, 2803 0, 0, false, 0, 2804 /*FIXME: hasExceptionSpec*/false, 2805 false, 0, 0, FunctionType::ExtInfo()); 2806 2807 DeclarationName Name 2808 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2809 CXXDestructorDecl *Destructor 2810 = CXXDestructorDecl::Create(Context, ClassDecl, 2811 ClassDecl->getLocation(), Name, Ty, 2812 /*isInline=*/true, 2813 /*isImplicitlyDeclared=*/true); 2814 Destructor->setAccess(AS_public); 2815 Destructor->setImplicit(); 2816 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2817 if (S) 2818 PushOnScopeChains(Destructor, S, true); 2819 else 2820 ClassDecl->addDecl(Destructor); 2821 2822 // This could be uniqued if it ever proves significant. 2823 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2824 2825 AddOverriddenMethods(ClassDecl, Destructor); 2826 } 2827} 2828 2829void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2830 Decl *D = TemplateD.getAs<Decl>(); 2831 if (!D) 2832 return; 2833 2834 TemplateParameterList *Params = 0; 2835 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2836 Params = Template->getTemplateParameters(); 2837 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2838 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2839 Params = PartialSpec->getTemplateParameters(); 2840 else 2841 return; 2842 2843 for (TemplateParameterList::iterator Param = Params->begin(), 2844 ParamEnd = Params->end(); 2845 Param != ParamEnd; ++Param) { 2846 NamedDecl *Named = cast<NamedDecl>(*Param); 2847 if (Named->getDeclName()) { 2848 S->AddDecl(DeclPtrTy::make(Named)); 2849 IdResolver.AddDecl(Named); 2850 } 2851 } 2852} 2853 2854void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2855 if (!RecordD) return; 2856 AdjustDeclIfTemplate(RecordD); 2857 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2858 PushDeclContext(S, Record); 2859} 2860 2861void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2862 if (!RecordD) return; 2863 PopDeclContext(); 2864} 2865 2866/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2867/// parsing a top-level (non-nested) C++ class, and we are now 2868/// parsing those parts of the given Method declaration that could 2869/// not be parsed earlier (C++ [class.mem]p2), such as default 2870/// arguments. This action should enter the scope of the given 2871/// Method declaration as if we had just parsed the qualified method 2872/// name. However, it should not bring the parameters into scope; 2873/// that will be performed by ActOnDelayedCXXMethodParameter. 2874void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2875} 2876 2877/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2878/// C++ method declaration. We're (re-)introducing the given 2879/// function parameter into scope for use in parsing later parts of 2880/// the method declaration. For example, we could see an 2881/// ActOnParamDefaultArgument event for this parameter. 2882void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2883 if (!ParamD) 2884 return; 2885 2886 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2887 2888 // If this parameter has an unparsed default argument, clear it out 2889 // to make way for the parsed default argument. 2890 if (Param->hasUnparsedDefaultArg()) 2891 Param->setDefaultArg(0); 2892 2893 S->AddDecl(DeclPtrTy::make(Param)); 2894 if (Param->getDeclName()) 2895 IdResolver.AddDecl(Param); 2896} 2897 2898/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2899/// processing the delayed method declaration for Method. The method 2900/// declaration is now considered finished. There may be a separate 2901/// ActOnStartOfFunctionDef action later (not necessarily 2902/// immediately!) for this method, if it was also defined inside the 2903/// class body. 2904void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2905 if (!MethodD) 2906 return; 2907 2908 AdjustDeclIfTemplate(MethodD); 2909 2910 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2911 2912 // Now that we have our default arguments, check the constructor 2913 // again. It could produce additional diagnostics or affect whether 2914 // the class has implicitly-declared destructors, among other 2915 // things. 2916 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2917 CheckConstructor(Constructor); 2918 2919 // Check the default arguments, which we may have added. 2920 if (!Method->isInvalidDecl()) 2921 CheckCXXDefaultArguments(Method); 2922} 2923 2924/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2925/// the well-formedness of the constructor declarator @p D with type @p 2926/// R. If there are any errors in the declarator, this routine will 2927/// emit diagnostics and set the invalid bit to true. In any case, the type 2928/// will be updated to reflect a well-formed type for the constructor and 2929/// returned. 2930QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2931 FunctionDecl::StorageClass &SC) { 2932 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2933 2934 // C++ [class.ctor]p3: 2935 // A constructor shall not be virtual (10.3) or static (9.4). A 2936 // constructor can be invoked for a const, volatile or const 2937 // volatile object. A constructor shall not be declared const, 2938 // volatile, or const volatile (9.3.2). 2939 if (isVirtual) { 2940 if (!D.isInvalidType()) 2941 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2942 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2943 << SourceRange(D.getIdentifierLoc()); 2944 D.setInvalidType(); 2945 } 2946 if (SC == FunctionDecl::Static) { 2947 if (!D.isInvalidType()) 2948 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2949 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2950 << SourceRange(D.getIdentifierLoc()); 2951 D.setInvalidType(); 2952 SC = FunctionDecl::None; 2953 } 2954 2955 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2956 if (FTI.TypeQuals != 0) { 2957 if (FTI.TypeQuals & Qualifiers::Const) 2958 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2959 << "const" << SourceRange(D.getIdentifierLoc()); 2960 if (FTI.TypeQuals & Qualifiers::Volatile) 2961 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2962 << "volatile" << SourceRange(D.getIdentifierLoc()); 2963 if (FTI.TypeQuals & Qualifiers::Restrict) 2964 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2965 << "restrict" << SourceRange(D.getIdentifierLoc()); 2966 } 2967 2968 // Rebuild the function type "R" without any type qualifiers (in 2969 // case any of the errors above fired) and with "void" as the 2970 // return type, since constructors don't have return types. We 2971 // *always* have to do this, because GetTypeForDeclarator will 2972 // put in a result type of "int" when none was specified. 2973 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2974 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2975 Proto->getNumArgs(), 2976 Proto->isVariadic(), 0, 2977 Proto->hasExceptionSpec(), 2978 Proto->hasAnyExceptionSpec(), 2979 Proto->getNumExceptions(), 2980 Proto->exception_begin(), 2981 Proto->getExtInfo()); 2982} 2983 2984/// CheckConstructor - Checks a fully-formed constructor for 2985/// well-formedness, issuing any diagnostics required. Returns true if 2986/// the constructor declarator is invalid. 2987void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2988 CXXRecordDecl *ClassDecl 2989 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2990 if (!ClassDecl) 2991 return Constructor->setInvalidDecl(); 2992 2993 // C++ [class.copy]p3: 2994 // A declaration of a constructor for a class X is ill-formed if 2995 // its first parameter is of type (optionally cv-qualified) X and 2996 // either there are no other parameters or else all other 2997 // parameters have default arguments. 2998 if (!Constructor->isInvalidDecl() && 2999 ((Constructor->getNumParams() == 1) || 3000 (Constructor->getNumParams() > 1 && 3001 Constructor->getParamDecl(1)->hasDefaultArg())) && 3002 Constructor->getTemplateSpecializationKind() 3003 != TSK_ImplicitInstantiation) { 3004 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3005 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3006 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3007 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3008 const char *ConstRef 3009 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3010 : " const &"; 3011 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3012 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3013 3014 // FIXME: Rather that making the constructor invalid, we should endeavor 3015 // to fix the type. 3016 Constructor->setInvalidDecl(); 3017 } 3018 } 3019 3020 // Notify the class that we've added a constructor. In principle we 3021 // don't need to do this for out-of-line declarations; in practice 3022 // we only instantiate the most recent declaration of a method, so 3023 // we have to call this for everything but friends. 3024 if (!Constructor->getFriendObjectKind()) 3025 ClassDecl->addedConstructor(Context, Constructor); 3026} 3027 3028/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 3029/// issuing any diagnostics required. Returns true on error. 3030bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3031 CXXRecordDecl *RD = Destructor->getParent(); 3032 3033 if (Destructor->isVirtual()) { 3034 SourceLocation Loc; 3035 3036 if (!Destructor->isImplicit()) 3037 Loc = Destructor->getLocation(); 3038 else 3039 Loc = RD->getLocation(); 3040 3041 // If we have a virtual destructor, look up the deallocation function 3042 FunctionDecl *OperatorDelete = 0; 3043 DeclarationName Name = 3044 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3045 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3046 return true; 3047 3048 Destructor->setOperatorDelete(OperatorDelete); 3049 } 3050 3051 return false; 3052} 3053 3054static inline bool 3055FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3056 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3057 FTI.ArgInfo[0].Param && 3058 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3059} 3060 3061/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3062/// the well-formednes of the destructor declarator @p D with type @p 3063/// R. If there are any errors in the declarator, this routine will 3064/// emit diagnostics and set the declarator to invalid. Even if this happens, 3065/// will be updated to reflect a well-formed type for the destructor and 3066/// returned. 3067QualType Sema::CheckDestructorDeclarator(Declarator &D, 3068 FunctionDecl::StorageClass& SC) { 3069 // C++ [class.dtor]p1: 3070 // [...] A typedef-name that names a class is a class-name 3071 // (7.1.3); however, a typedef-name that names a class shall not 3072 // be used as the identifier in the declarator for a destructor 3073 // declaration. 3074 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3075 if (isa<TypedefType>(DeclaratorType)) { 3076 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3077 << DeclaratorType; 3078 D.setInvalidType(); 3079 } 3080 3081 // C++ [class.dtor]p2: 3082 // A destructor is used to destroy objects of its class type. A 3083 // destructor takes no parameters, and no return type can be 3084 // specified for it (not even void). The address of a destructor 3085 // shall not be taken. A destructor shall not be static. A 3086 // destructor can be invoked for a const, volatile or const 3087 // volatile object. A destructor shall not be declared const, 3088 // volatile or const volatile (9.3.2). 3089 if (SC == FunctionDecl::Static) { 3090 if (!D.isInvalidType()) 3091 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3092 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3093 << SourceRange(D.getIdentifierLoc()); 3094 SC = FunctionDecl::None; 3095 D.setInvalidType(); 3096 } 3097 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3098 // Destructors don't have return types, but the parser will 3099 // happily parse something like: 3100 // 3101 // class X { 3102 // float ~X(); 3103 // }; 3104 // 3105 // The return type will be eliminated later. 3106 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3107 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3108 << SourceRange(D.getIdentifierLoc()); 3109 } 3110 3111 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3112 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3113 if (FTI.TypeQuals & Qualifiers::Const) 3114 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3115 << "const" << SourceRange(D.getIdentifierLoc()); 3116 if (FTI.TypeQuals & Qualifiers::Volatile) 3117 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3118 << "volatile" << SourceRange(D.getIdentifierLoc()); 3119 if (FTI.TypeQuals & Qualifiers::Restrict) 3120 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3121 << "restrict" << SourceRange(D.getIdentifierLoc()); 3122 D.setInvalidType(); 3123 } 3124 3125 // Make sure we don't have any parameters. 3126 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3127 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3128 3129 // Delete the parameters. 3130 FTI.freeArgs(); 3131 D.setInvalidType(); 3132 } 3133 3134 // Make sure the destructor isn't variadic. 3135 if (FTI.isVariadic) { 3136 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3137 D.setInvalidType(); 3138 } 3139 3140 // Rebuild the function type "R" without any type qualifiers or 3141 // parameters (in case any of the errors above fired) and with 3142 // "void" as the return type, since destructors don't have return 3143 // types. We *always* have to do this, because GetTypeForDeclarator 3144 // will put in a result type of "int" when none was specified. 3145 // FIXME: Exceptions! 3146 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3147 false, false, 0, 0, FunctionType::ExtInfo()); 3148} 3149 3150/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3151/// well-formednes of the conversion function declarator @p D with 3152/// type @p R. If there are any errors in the declarator, this routine 3153/// will emit diagnostics and return true. Otherwise, it will return 3154/// false. Either way, the type @p R will be updated to reflect a 3155/// well-formed type for the conversion operator. 3156void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3157 FunctionDecl::StorageClass& SC) { 3158 // C++ [class.conv.fct]p1: 3159 // Neither parameter types nor return type can be specified. The 3160 // type of a conversion function (8.3.5) is "function taking no 3161 // parameter returning conversion-type-id." 3162 if (SC == FunctionDecl::Static) { 3163 if (!D.isInvalidType()) 3164 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3165 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3166 << SourceRange(D.getIdentifierLoc()); 3167 D.setInvalidType(); 3168 SC = FunctionDecl::None; 3169 } 3170 3171 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3172 3173 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3174 // Conversion functions don't have return types, but the parser will 3175 // happily parse something like: 3176 // 3177 // class X { 3178 // float operator bool(); 3179 // }; 3180 // 3181 // The return type will be changed later anyway. 3182 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3183 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3184 << SourceRange(D.getIdentifierLoc()); 3185 D.setInvalidType(); 3186 } 3187 3188 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3189 3190 // Make sure we don't have any parameters. 3191 if (Proto->getNumArgs() > 0) { 3192 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3193 3194 // Delete the parameters. 3195 D.getTypeObject(0).Fun.freeArgs(); 3196 D.setInvalidType(); 3197 } else if (Proto->isVariadic()) { 3198 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3199 D.setInvalidType(); 3200 } 3201 3202 // Diagnose "&operator bool()" and other such nonsense. This 3203 // is actually a gcc extension which we don't support. 3204 if (Proto->getResultType() != ConvType) { 3205 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3206 << Proto->getResultType(); 3207 D.setInvalidType(); 3208 ConvType = Proto->getResultType(); 3209 } 3210 3211 // C++ [class.conv.fct]p4: 3212 // The conversion-type-id shall not represent a function type nor 3213 // an array type. 3214 if (ConvType->isArrayType()) { 3215 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3216 ConvType = Context.getPointerType(ConvType); 3217 D.setInvalidType(); 3218 } else if (ConvType->isFunctionType()) { 3219 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3220 ConvType = Context.getPointerType(ConvType); 3221 D.setInvalidType(); 3222 } 3223 3224 // Rebuild the function type "R" without any parameters (in case any 3225 // of the errors above fired) and with the conversion type as the 3226 // return type. 3227 if (D.isInvalidType()) { 3228 R = Context.getFunctionType(ConvType, 0, 0, false, 3229 Proto->getTypeQuals(), 3230 Proto->hasExceptionSpec(), 3231 Proto->hasAnyExceptionSpec(), 3232 Proto->getNumExceptions(), 3233 Proto->exception_begin(), 3234 Proto->getExtInfo()); 3235 } 3236 3237 // C++0x explicit conversion operators. 3238 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3239 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3240 diag::warn_explicit_conversion_functions) 3241 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3242} 3243 3244/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3245/// the declaration of the given C++ conversion function. This routine 3246/// is responsible for recording the conversion function in the C++ 3247/// class, if possible. 3248Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3249 assert(Conversion && "Expected to receive a conversion function declaration"); 3250 3251 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3252 3253 // Make sure we aren't redeclaring the conversion function. 3254 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3255 3256 // C++ [class.conv.fct]p1: 3257 // [...] A conversion function is never used to convert a 3258 // (possibly cv-qualified) object to the (possibly cv-qualified) 3259 // same object type (or a reference to it), to a (possibly 3260 // cv-qualified) base class of that type (or a reference to it), 3261 // or to (possibly cv-qualified) void. 3262 // FIXME: Suppress this warning if the conversion function ends up being a 3263 // virtual function that overrides a virtual function in a base class. 3264 QualType ClassType 3265 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3266 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3267 ConvType = ConvTypeRef->getPointeeType(); 3268 if (ConvType->isRecordType()) { 3269 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3270 if (ConvType == ClassType) 3271 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3272 << ClassType; 3273 else if (IsDerivedFrom(ClassType, ConvType)) 3274 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3275 << ClassType << ConvType; 3276 } else if (ConvType->isVoidType()) { 3277 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3278 << ClassType << ConvType; 3279 } 3280 3281 if (Conversion->getPrimaryTemplate()) { 3282 // ignore specializations 3283 } else if (Conversion->getPreviousDeclaration()) { 3284 if (FunctionTemplateDecl *ConversionTemplate 3285 = Conversion->getDescribedFunctionTemplate()) { 3286 if (ClassDecl->replaceConversion( 3287 ConversionTemplate->getPreviousDeclaration(), 3288 ConversionTemplate)) 3289 return DeclPtrTy::make(ConversionTemplate); 3290 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3291 Conversion)) 3292 return DeclPtrTy::make(Conversion); 3293 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3294 } else if (FunctionTemplateDecl *ConversionTemplate 3295 = Conversion->getDescribedFunctionTemplate()) 3296 ClassDecl->addConversionFunction(ConversionTemplate); 3297 else 3298 ClassDecl->addConversionFunction(Conversion); 3299 3300 return DeclPtrTy::make(Conversion); 3301} 3302 3303//===----------------------------------------------------------------------===// 3304// Namespace Handling 3305//===----------------------------------------------------------------------===// 3306 3307/// ActOnStartNamespaceDef - This is called at the start of a namespace 3308/// definition. 3309Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3310 SourceLocation IdentLoc, 3311 IdentifierInfo *II, 3312 SourceLocation LBrace, 3313 AttributeList *AttrList) { 3314 NamespaceDecl *Namespc = 3315 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3316 Namespc->setLBracLoc(LBrace); 3317 3318 Scope *DeclRegionScope = NamespcScope->getParent(); 3319 3320 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3321 3322 if (II) { 3323 // C++ [namespace.def]p2: 3324 // The identifier in an original-namespace-definition shall not have been 3325 // previously defined in the declarative region in which the 3326 // original-namespace-definition appears. The identifier in an 3327 // original-namespace-definition is the name of the namespace. Subsequently 3328 // in that declarative region, it is treated as an original-namespace-name. 3329 3330 NamedDecl *PrevDecl 3331 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3332 ForRedeclaration); 3333 3334 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3335 // This is an extended namespace definition. 3336 // Attach this namespace decl to the chain of extended namespace 3337 // definitions. 3338 OrigNS->setNextNamespace(Namespc); 3339 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3340 3341 // Remove the previous declaration from the scope. 3342 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3343 IdResolver.RemoveDecl(OrigNS); 3344 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3345 } 3346 } else if (PrevDecl) { 3347 // This is an invalid name redefinition. 3348 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3349 << Namespc->getDeclName(); 3350 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3351 Namespc->setInvalidDecl(); 3352 // Continue on to push Namespc as current DeclContext and return it. 3353 } else if (II->isStr("std") && 3354 CurContext->getLookupContext()->isTranslationUnit()) { 3355 // This is the first "real" definition of the namespace "std", so update 3356 // our cache of the "std" namespace to point at this definition. 3357 if (StdNamespace) { 3358 // We had already defined a dummy namespace "std". Link this new 3359 // namespace definition to the dummy namespace "std". 3360 StdNamespace->setNextNamespace(Namespc); 3361 StdNamespace->setLocation(IdentLoc); 3362 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3363 } 3364 3365 // Make our StdNamespace cache point at the first real definition of the 3366 // "std" namespace. 3367 StdNamespace = Namespc; 3368 } 3369 3370 PushOnScopeChains(Namespc, DeclRegionScope); 3371 } else { 3372 // Anonymous namespaces. 3373 assert(Namespc->isAnonymousNamespace()); 3374 3375 // Link the anonymous namespace into its parent. 3376 NamespaceDecl *PrevDecl; 3377 DeclContext *Parent = CurContext->getLookupContext(); 3378 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3379 PrevDecl = TU->getAnonymousNamespace(); 3380 TU->setAnonymousNamespace(Namespc); 3381 } else { 3382 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3383 PrevDecl = ND->getAnonymousNamespace(); 3384 ND->setAnonymousNamespace(Namespc); 3385 } 3386 3387 // Link the anonymous namespace with its previous declaration. 3388 if (PrevDecl) { 3389 assert(PrevDecl->isAnonymousNamespace()); 3390 assert(!PrevDecl->getNextNamespace()); 3391 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3392 PrevDecl->setNextNamespace(Namespc); 3393 } 3394 3395 CurContext->addDecl(Namespc); 3396 3397 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3398 // behaves as if it were replaced by 3399 // namespace unique { /* empty body */ } 3400 // using namespace unique; 3401 // namespace unique { namespace-body } 3402 // where all occurrences of 'unique' in a translation unit are 3403 // replaced by the same identifier and this identifier differs 3404 // from all other identifiers in the entire program. 3405 3406 // We just create the namespace with an empty name and then add an 3407 // implicit using declaration, just like the standard suggests. 3408 // 3409 // CodeGen enforces the "universally unique" aspect by giving all 3410 // declarations semantically contained within an anonymous 3411 // namespace internal linkage. 3412 3413 if (!PrevDecl) { 3414 UsingDirectiveDecl* UD 3415 = UsingDirectiveDecl::Create(Context, CurContext, 3416 /* 'using' */ LBrace, 3417 /* 'namespace' */ SourceLocation(), 3418 /* qualifier */ SourceRange(), 3419 /* NNS */ NULL, 3420 /* identifier */ SourceLocation(), 3421 Namespc, 3422 /* Ancestor */ CurContext); 3423 UD->setImplicit(); 3424 CurContext->addDecl(UD); 3425 } 3426 } 3427 3428 // Although we could have an invalid decl (i.e. the namespace name is a 3429 // redefinition), push it as current DeclContext and try to continue parsing. 3430 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3431 // for the namespace has the declarations that showed up in that particular 3432 // namespace definition. 3433 PushDeclContext(NamespcScope, Namespc); 3434 return DeclPtrTy::make(Namespc); 3435} 3436 3437/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3438/// is a namespace alias, returns the namespace it points to. 3439static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3440 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3441 return AD->getNamespace(); 3442 return dyn_cast_or_null<NamespaceDecl>(D); 3443} 3444 3445/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3446/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3447void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3448 Decl *Dcl = D.getAs<Decl>(); 3449 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3450 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3451 Namespc->setRBracLoc(RBrace); 3452 PopDeclContext(); 3453} 3454 3455/// \brief Retrieve the special "std" namespace, which may require us to 3456/// implicitly define the namespace. 3457NamespaceDecl *Sema::getStdNamespace() { 3458 if (!StdNamespace) { 3459 // The "std" namespace has not yet been defined, so build one implicitly. 3460 StdNamespace = NamespaceDecl::Create(Context, 3461 Context.getTranslationUnitDecl(), 3462 SourceLocation(), 3463 &PP.getIdentifierTable().get("std")); 3464 StdNamespace->setImplicit(true); 3465 } 3466 3467 return StdNamespace; 3468} 3469 3470Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3471 SourceLocation UsingLoc, 3472 SourceLocation NamespcLoc, 3473 CXXScopeSpec &SS, 3474 SourceLocation IdentLoc, 3475 IdentifierInfo *NamespcName, 3476 AttributeList *AttrList) { 3477 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3478 assert(NamespcName && "Invalid NamespcName."); 3479 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3480 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3481 3482 UsingDirectiveDecl *UDir = 0; 3483 NestedNameSpecifier *Qualifier = 0; 3484 if (SS.isSet()) 3485 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3486 3487 // Lookup namespace name. 3488 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3489 LookupParsedName(R, S, &SS); 3490 if (R.isAmbiguous()) 3491 return DeclPtrTy(); 3492 3493 if (R.empty()) { 3494 // Allow "using namespace std;" or "using namespace ::std;" even if 3495 // "std" hasn't been defined yet, for GCC compatibility. 3496 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3497 NamespcName->isStr("std")) { 3498 Diag(IdentLoc, diag::ext_using_undefined_std); 3499 R.addDecl(getStdNamespace()); 3500 R.resolveKind(); 3501 } 3502 // Otherwise, attempt typo correction. 3503 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3504 CTC_NoKeywords, 0)) { 3505 if (R.getAsSingle<NamespaceDecl>() || 3506 R.getAsSingle<NamespaceAliasDecl>()) { 3507 if (DeclContext *DC = computeDeclContext(SS, false)) 3508 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3509 << NamespcName << DC << Corrected << SS.getRange() 3510 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3511 else 3512 Diag(IdentLoc, diag::err_using_directive_suggest) 3513 << NamespcName << Corrected 3514 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3515 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3516 << Corrected; 3517 3518 NamespcName = Corrected.getAsIdentifierInfo(); 3519 } 3520 } 3521 } 3522 3523 if (!R.empty()) { 3524 NamedDecl *Named = R.getFoundDecl(); 3525 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3526 && "expected namespace decl"); 3527 // C++ [namespace.udir]p1: 3528 // A using-directive specifies that the names in the nominated 3529 // namespace can be used in the scope in which the 3530 // using-directive appears after the using-directive. During 3531 // unqualified name lookup (3.4.1), the names appear as if they 3532 // were declared in the nearest enclosing namespace which 3533 // contains both the using-directive and the nominated 3534 // namespace. [Note: in this context, "contains" means "contains 3535 // directly or indirectly". ] 3536 3537 // Find enclosing context containing both using-directive and 3538 // nominated namespace. 3539 NamespaceDecl *NS = getNamespaceDecl(Named); 3540 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3541 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3542 CommonAncestor = CommonAncestor->getParent(); 3543 3544 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3545 SS.getRange(), 3546 (NestedNameSpecifier *)SS.getScopeRep(), 3547 IdentLoc, Named, CommonAncestor); 3548 PushUsingDirective(S, UDir); 3549 } else { 3550 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3551 } 3552 3553 // FIXME: We ignore attributes for now. 3554 delete AttrList; 3555 return DeclPtrTy::make(UDir); 3556} 3557 3558void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3559 // If scope has associated entity, then using directive is at namespace 3560 // or translation unit scope. We add UsingDirectiveDecls, into 3561 // it's lookup structure. 3562 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3563 Ctx->addDecl(UDir); 3564 else 3565 // Otherwise it is block-sope. using-directives will affect lookup 3566 // only to the end of scope. 3567 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3568} 3569 3570 3571Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3572 AccessSpecifier AS, 3573 bool HasUsingKeyword, 3574 SourceLocation UsingLoc, 3575 CXXScopeSpec &SS, 3576 UnqualifiedId &Name, 3577 AttributeList *AttrList, 3578 bool IsTypeName, 3579 SourceLocation TypenameLoc) { 3580 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3581 3582 switch (Name.getKind()) { 3583 case UnqualifiedId::IK_Identifier: 3584 case UnqualifiedId::IK_OperatorFunctionId: 3585 case UnqualifiedId::IK_LiteralOperatorId: 3586 case UnqualifiedId::IK_ConversionFunctionId: 3587 break; 3588 3589 case UnqualifiedId::IK_ConstructorName: 3590 case UnqualifiedId::IK_ConstructorTemplateId: 3591 // C++0x inherited constructors. 3592 if (getLangOptions().CPlusPlus0x) break; 3593 3594 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3595 << SS.getRange(); 3596 return DeclPtrTy(); 3597 3598 case UnqualifiedId::IK_DestructorName: 3599 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3600 << SS.getRange(); 3601 return DeclPtrTy(); 3602 3603 case UnqualifiedId::IK_TemplateId: 3604 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3605 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3606 return DeclPtrTy(); 3607 } 3608 3609 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3610 if (!TargetName) 3611 return DeclPtrTy(); 3612 3613 // Warn about using declarations. 3614 // TODO: store that the declaration was written without 'using' and 3615 // talk about access decls instead of using decls in the 3616 // diagnostics. 3617 if (!HasUsingKeyword) { 3618 UsingLoc = Name.getSourceRange().getBegin(); 3619 3620 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3621 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3622 } 3623 3624 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3625 Name.getSourceRange().getBegin(), 3626 TargetName, AttrList, 3627 /* IsInstantiation */ false, 3628 IsTypeName, TypenameLoc); 3629 if (UD) 3630 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3631 3632 return DeclPtrTy::make(UD); 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 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3702 return false; 3703 3704 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3705 } 3706 3707 if (Target->isFunctionOrFunctionTemplate()) { 3708 FunctionDecl *FD; 3709 if (isa<FunctionTemplateDecl>(Target)) 3710 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3711 else 3712 FD = cast<FunctionDecl>(Target); 3713 3714 NamedDecl *OldDecl = 0; 3715 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3716 case Ovl_Overload: 3717 return false; 3718 3719 case Ovl_NonFunction: 3720 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3721 break; 3722 3723 // We found a decl with the exact signature. 3724 case Ovl_Match: 3725 // If we're in a record, we want to hide the target, so we 3726 // return true (without a diagnostic) to tell the caller not to 3727 // build a shadow decl. 3728 if (CurContext->isRecord()) 3729 return true; 3730 3731 // If we're not in a record, this is an error. 3732 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3733 break; 3734 } 3735 3736 Diag(Target->getLocation(), diag::note_using_decl_target); 3737 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3738 return true; 3739 } 3740 3741 // Target is not a function. 3742 3743 if (isa<TagDecl>(Target)) { 3744 // No conflict between a tag and a non-tag. 3745 if (!Tag) return false; 3746 3747 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3748 Diag(Target->getLocation(), diag::note_using_decl_target); 3749 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3750 return true; 3751 } 3752 3753 // No conflict between a tag and a non-tag. 3754 if (!NonTag) return false; 3755 3756 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3757 Diag(Target->getLocation(), diag::note_using_decl_target); 3758 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3759 return true; 3760} 3761 3762/// Builds a shadow declaration corresponding to a 'using' declaration. 3763UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3764 UsingDecl *UD, 3765 NamedDecl *Orig) { 3766 3767 // If we resolved to another shadow declaration, just coalesce them. 3768 NamedDecl *Target = Orig; 3769 if (isa<UsingShadowDecl>(Target)) { 3770 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3771 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3772 } 3773 3774 UsingShadowDecl *Shadow 3775 = UsingShadowDecl::Create(Context, CurContext, 3776 UD->getLocation(), UD, Target); 3777 UD->addShadowDecl(Shadow); 3778 3779 if (S) 3780 PushOnScopeChains(Shadow, S); 3781 else 3782 CurContext->addDecl(Shadow); 3783 Shadow->setAccess(UD->getAccess()); 3784 3785 // Register it as a conversion if appropriate. 3786 if (Shadow->getDeclName().getNameKind() 3787 == DeclarationName::CXXConversionFunctionName) 3788 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3789 3790 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3791 Shadow->setInvalidDecl(); 3792 3793 return Shadow; 3794} 3795 3796/// Hides a using shadow declaration. This is required by the current 3797/// using-decl implementation when a resolvable using declaration in a 3798/// class is followed by a declaration which would hide or override 3799/// one or more of the using decl's targets; for example: 3800/// 3801/// struct Base { void foo(int); }; 3802/// struct Derived : Base { 3803/// using Base::foo; 3804/// void foo(int); 3805/// }; 3806/// 3807/// The governing language is C++03 [namespace.udecl]p12: 3808/// 3809/// When a using-declaration brings names from a base class into a 3810/// derived class scope, member functions in the derived class 3811/// override and/or hide member functions with the same name and 3812/// parameter types in a base class (rather than conflicting). 3813/// 3814/// There are two ways to implement this: 3815/// (1) optimistically create shadow decls when they're not hidden 3816/// by existing declarations, or 3817/// (2) don't create any shadow decls (or at least don't make them 3818/// visible) until we've fully parsed/instantiated the class. 3819/// The problem with (1) is that we might have to retroactively remove 3820/// a shadow decl, which requires several O(n) operations because the 3821/// decl structures are (very reasonably) not designed for removal. 3822/// (2) avoids this but is very fiddly and phase-dependent. 3823void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3824 if (Shadow->getDeclName().getNameKind() == 3825 DeclarationName::CXXConversionFunctionName) 3826 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3827 3828 // Remove it from the DeclContext... 3829 Shadow->getDeclContext()->removeDecl(Shadow); 3830 3831 // ...and the scope, if applicable... 3832 if (S) { 3833 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3834 IdResolver.RemoveDecl(Shadow); 3835 } 3836 3837 // ...and the using decl. 3838 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3839 3840 // TODO: complain somehow if Shadow was used. It shouldn't 3841 // be possible for this to happen, because...? 3842} 3843 3844/// Builds a using declaration. 3845/// 3846/// \param IsInstantiation - Whether this call arises from an 3847/// instantiation of an unresolved using declaration. We treat 3848/// the lookup differently for these declarations. 3849NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3850 SourceLocation UsingLoc, 3851 CXXScopeSpec &SS, 3852 SourceLocation IdentLoc, 3853 DeclarationName Name, 3854 AttributeList *AttrList, 3855 bool IsInstantiation, 3856 bool IsTypeName, 3857 SourceLocation TypenameLoc) { 3858 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3859 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3860 3861 // FIXME: We ignore attributes for now. 3862 delete AttrList; 3863 3864 if (SS.isEmpty()) { 3865 Diag(IdentLoc, diag::err_using_requires_qualname); 3866 return 0; 3867 } 3868 3869 // Do the redeclaration lookup in the current scope. 3870 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3871 ForRedeclaration); 3872 Previous.setHideTags(false); 3873 if (S) { 3874 LookupName(Previous, S); 3875 3876 // It is really dumb that we have to do this. 3877 LookupResult::Filter F = Previous.makeFilter(); 3878 while (F.hasNext()) { 3879 NamedDecl *D = F.next(); 3880 if (!isDeclInScope(D, CurContext, S)) 3881 F.erase(); 3882 } 3883 F.done(); 3884 } else { 3885 assert(IsInstantiation && "no scope in non-instantiation"); 3886 assert(CurContext->isRecord() && "scope not record in instantiation"); 3887 LookupQualifiedName(Previous, CurContext); 3888 } 3889 3890 NestedNameSpecifier *NNS = 3891 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3892 3893 // Check for invalid redeclarations. 3894 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3895 return 0; 3896 3897 // Check for bad qualifiers. 3898 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3899 return 0; 3900 3901 DeclContext *LookupContext = computeDeclContext(SS); 3902 NamedDecl *D; 3903 if (!LookupContext) { 3904 if (IsTypeName) { 3905 // FIXME: not all declaration name kinds are legal here 3906 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3907 UsingLoc, TypenameLoc, 3908 SS.getRange(), NNS, 3909 IdentLoc, Name); 3910 } else { 3911 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3912 UsingLoc, SS.getRange(), NNS, 3913 IdentLoc, Name); 3914 } 3915 } else { 3916 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3917 SS.getRange(), UsingLoc, NNS, Name, 3918 IsTypeName); 3919 } 3920 D->setAccess(AS); 3921 CurContext->addDecl(D); 3922 3923 if (!LookupContext) return D; 3924 UsingDecl *UD = cast<UsingDecl>(D); 3925 3926 if (RequireCompleteDeclContext(SS, LookupContext)) { 3927 UD->setInvalidDecl(); 3928 return UD; 3929 } 3930 3931 // Look up the target name. 3932 3933 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3934 3935 // Unlike most lookups, we don't always want to hide tag 3936 // declarations: tag names are visible through the using declaration 3937 // even if hidden by ordinary names, *except* in a dependent context 3938 // where it's important for the sanity of two-phase lookup. 3939 if (!IsInstantiation) 3940 R.setHideTags(false); 3941 3942 LookupQualifiedName(R, LookupContext); 3943 3944 if (R.empty()) { 3945 Diag(IdentLoc, diag::err_no_member) 3946 << Name << LookupContext << SS.getRange(); 3947 UD->setInvalidDecl(); 3948 return UD; 3949 } 3950 3951 if (R.isAmbiguous()) { 3952 UD->setInvalidDecl(); 3953 return UD; 3954 } 3955 3956 if (IsTypeName) { 3957 // If we asked for a typename and got a non-type decl, error out. 3958 if (!R.getAsSingle<TypeDecl>()) { 3959 Diag(IdentLoc, diag::err_using_typename_non_type); 3960 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3961 Diag((*I)->getUnderlyingDecl()->getLocation(), 3962 diag::note_using_decl_target); 3963 UD->setInvalidDecl(); 3964 return UD; 3965 } 3966 } else { 3967 // If we asked for a non-typename and we got a type, error out, 3968 // but only if this is an instantiation of an unresolved using 3969 // decl. Otherwise just silently find the type name. 3970 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3971 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3972 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3973 UD->setInvalidDecl(); 3974 return UD; 3975 } 3976 } 3977 3978 // C++0x N2914 [namespace.udecl]p6: 3979 // A using-declaration shall not name a namespace. 3980 if (R.getAsSingle<NamespaceDecl>()) { 3981 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3982 << SS.getRange(); 3983 UD->setInvalidDecl(); 3984 return UD; 3985 } 3986 3987 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3988 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3989 BuildUsingShadowDecl(S, UD, *I); 3990 } 3991 3992 return UD; 3993} 3994 3995/// Checks that the given using declaration is not an invalid 3996/// redeclaration. Note that this is checking only for the using decl 3997/// itself, not for any ill-formedness among the UsingShadowDecls. 3998bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3999 bool isTypeName, 4000 const CXXScopeSpec &SS, 4001 SourceLocation NameLoc, 4002 const LookupResult &Prev) { 4003 // C++03 [namespace.udecl]p8: 4004 // C++0x [namespace.udecl]p10: 4005 // A using-declaration is a declaration and can therefore be used 4006 // repeatedly where (and only where) multiple declarations are 4007 // allowed. 4008 // 4009 // That's in non-member contexts. 4010 if (!CurContext->getLookupContext()->isRecord()) 4011 return false; 4012 4013 NestedNameSpecifier *Qual 4014 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4015 4016 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4017 NamedDecl *D = *I; 4018 4019 bool DTypename; 4020 NestedNameSpecifier *DQual; 4021 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4022 DTypename = UD->isTypeName(); 4023 DQual = UD->getTargetNestedNameDecl(); 4024 } else if (UnresolvedUsingValueDecl *UD 4025 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4026 DTypename = false; 4027 DQual = UD->getTargetNestedNameSpecifier(); 4028 } else if (UnresolvedUsingTypenameDecl *UD 4029 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4030 DTypename = true; 4031 DQual = UD->getTargetNestedNameSpecifier(); 4032 } else continue; 4033 4034 // using decls differ if one says 'typename' and the other doesn't. 4035 // FIXME: non-dependent using decls? 4036 if (isTypeName != DTypename) continue; 4037 4038 // using decls differ if they name different scopes (but note that 4039 // template instantiation can cause this check to trigger when it 4040 // didn't before instantiation). 4041 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4042 Context.getCanonicalNestedNameSpecifier(DQual)) 4043 continue; 4044 4045 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4046 Diag(D->getLocation(), diag::note_using_decl) << 1; 4047 return true; 4048 } 4049 4050 return false; 4051} 4052 4053 4054/// Checks that the given nested-name qualifier used in a using decl 4055/// in the current context is appropriately related to the current 4056/// scope. If an error is found, diagnoses it and returns true. 4057bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4058 const CXXScopeSpec &SS, 4059 SourceLocation NameLoc) { 4060 DeclContext *NamedContext = computeDeclContext(SS); 4061 4062 if (!CurContext->isRecord()) { 4063 // C++03 [namespace.udecl]p3: 4064 // C++0x [namespace.udecl]p8: 4065 // A using-declaration for a class member shall be a member-declaration. 4066 4067 // If we weren't able to compute a valid scope, it must be a 4068 // dependent class scope. 4069 if (!NamedContext || NamedContext->isRecord()) { 4070 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4071 << SS.getRange(); 4072 return true; 4073 } 4074 4075 // Otherwise, everything is known to be fine. 4076 return false; 4077 } 4078 4079 // The current scope is a record. 4080 4081 // If the named context is dependent, we can't decide much. 4082 if (!NamedContext) { 4083 // FIXME: in C++0x, we can diagnose if we can prove that the 4084 // nested-name-specifier does not refer to a base class, which is 4085 // still possible in some cases. 4086 4087 // Otherwise we have to conservatively report that things might be 4088 // okay. 4089 return false; 4090 } 4091 4092 if (!NamedContext->isRecord()) { 4093 // Ideally this would point at the last name in the specifier, 4094 // but we don't have that level of source info. 4095 Diag(SS.getRange().getBegin(), 4096 diag::err_using_decl_nested_name_specifier_is_not_class) 4097 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4098 return true; 4099 } 4100 4101 if (getLangOptions().CPlusPlus0x) { 4102 // C++0x [namespace.udecl]p3: 4103 // In a using-declaration used as a member-declaration, the 4104 // nested-name-specifier shall name a base class of the class 4105 // being defined. 4106 4107 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4108 cast<CXXRecordDecl>(NamedContext))) { 4109 if (CurContext == NamedContext) { 4110 Diag(NameLoc, 4111 diag::err_using_decl_nested_name_specifier_is_current_class) 4112 << SS.getRange(); 4113 return true; 4114 } 4115 4116 Diag(SS.getRange().getBegin(), 4117 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4118 << (NestedNameSpecifier*) SS.getScopeRep() 4119 << cast<CXXRecordDecl>(CurContext) 4120 << SS.getRange(); 4121 return true; 4122 } 4123 4124 return false; 4125 } 4126 4127 // C++03 [namespace.udecl]p4: 4128 // A using-declaration used as a member-declaration shall refer 4129 // to a member of a base class of the class being defined [etc.]. 4130 4131 // Salient point: SS doesn't have to name a base class as long as 4132 // lookup only finds members from base classes. Therefore we can 4133 // diagnose here only if we can prove that that can't happen, 4134 // i.e. if the class hierarchies provably don't intersect. 4135 4136 // TODO: it would be nice if "definitely valid" results were cached 4137 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4138 // need to be repeated. 4139 4140 struct UserData { 4141 llvm::DenseSet<const CXXRecordDecl*> Bases; 4142 4143 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4144 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4145 Data->Bases.insert(Base); 4146 return true; 4147 } 4148 4149 bool hasDependentBases(const CXXRecordDecl *Class) { 4150 return !Class->forallBases(collect, this); 4151 } 4152 4153 /// Returns true if the base is dependent or is one of the 4154 /// accumulated base classes. 4155 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4156 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4157 return !Data->Bases.count(Base); 4158 } 4159 4160 bool mightShareBases(const CXXRecordDecl *Class) { 4161 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4162 } 4163 }; 4164 4165 UserData Data; 4166 4167 // Returns false if we find a dependent base. 4168 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4169 return false; 4170 4171 // Returns false if the class has a dependent base or if it or one 4172 // of its bases is present in the base set of the current context. 4173 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4174 return false; 4175 4176 Diag(SS.getRange().getBegin(), 4177 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4178 << (NestedNameSpecifier*) SS.getScopeRep() 4179 << cast<CXXRecordDecl>(CurContext) 4180 << SS.getRange(); 4181 4182 return true; 4183} 4184 4185Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4186 SourceLocation NamespaceLoc, 4187 SourceLocation AliasLoc, 4188 IdentifierInfo *Alias, 4189 CXXScopeSpec &SS, 4190 SourceLocation IdentLoc, 4191 IdentifierInfo *Ident) { 4192 4193 // Lookup the namespace name. 4194 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4195 LookupParsedName(R, S, &SS); 4196 4197 // Check if we have a previous declaration with the same name. 4198 NamedDecl *PrevDecl 4199 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4200 ForRedeclaration); 4201 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4202 PrevDecl = 0; 4203 4204 if (PrevDecl) { 4205 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4206 // We already have an alias with the same name that points to the same 4207 // namespace, so don't create a new one. 4208 // FIXME: At some point, we'll want to create the (redundant) 4209 // declaration to maintain better source information. 4210 if (!R.isAmbiguous() && !R.empty() && 4211 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4212 return DeclPtrTy(); 4213 } 4214 4215 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4216 diag::err_redefinition_different_kind; 4217 Diag(AliasLoc, DiagID) << Alias; 4218 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4219 return DeclPtrTy(); 4220 } 4221 4222 if (R.isAmbiguous()) 4223 return DeclPtrTy(); 4224 4225 if (R.empty()) { 4226 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4227 return DeclPtrTy(); 4228 } 4229 4230 NamespaceAliasDecl *AliasDecl = 4231 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4232 Alias, SS.getRange(), 4233 (NestedNameSpecifier *)SS.getScopeRep(), 4234 IdentLoc, R.getFoundDecl()); 4235 4236 PushOnScopeChains(AliasDecl, S); 4237 return DeclPtrTy::make(AliasDecl); 4238} 4239 4240namespace { 4241 /// \brief Scoped object used to handle the state changes required in Sema 4242 /// to implicitly define the body of a C++ member function; 4243 class ImplicitlyDefinedFunctionScope { 4244 Sema &S; 4245 DeclContext *PreviousContext; 4246 4247 public: 4248 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4249 : S(S), PreviousContext(S.CurContext) 4250 { 4251 S.CurContext = Method; 4252 S.PushFunctionScope(); 4253 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4254 } 4255 4256 ~ImplicitlyDefinedFunctionScope() { 4257 S.PopExpressionEvaluationContext(); 4258 S.PopFunctionOrBlockScope(); 4259 S.CurContext = PreviousContext; 4260 } 4261 }; 4262} 4263 4264void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4265 CXXConstructorDecl *Constructor) { 4266 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4267 !Constructor->isUsed(false)) && 4268 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4269 4270 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4271 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4272 4273 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4274 ErrorTrap Trap(*this); 4275 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4276 Trap.hasErrorOccurred()) { 4277 Diag(CurrentLocation, diag::note_member_synthesized_at) 4278 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4279 Constructor->setInvalidDecl(); 4280 } else { 4281 Constructor->setUsed(); 4282 MarkVTableUsed(CurrentLocation, ClassDecl); 4283 } 4284} 4285 4286void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4287 CXXDestructorDecl *Destructor) { 4288 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4289 "DefineImplicitDestructor - call it for implicit default dtor"); 4290 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4291 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4292 4293 if (Destructor->isInvalidDecl()) 4294 return; 4295 4296 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4297 4298 ErrorTrap Trap(*this); 4299 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4300 Destructor->getParent()); 4301 4302 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4303 Diag(CurrentLocation, diag::note_member_synthesized_at) 4304 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4305 4306 Destructor->setInvalidDecl(); 4307 return; 4308 } 4309 4310 Destructor->setUsed(); 4311 MarkVTableUsed(CurrentLocation, ClassDecl); 4312} 4313 4314/// \brief Builds a statement that copies the given entity from \p From to 4315/// \c To. 4316/// 4317/// This routine is used to copy the members of a class with an 4318/// implicitly-declared copy assignment operator. When the entities being 4319/// copied are arrays, this routine builds for loops to copy them. 4320/// 4321/// \param S The Sema object used for type-checking. 4322/// 4323/// \param Loc The location where the implicit copy is being generated. 4324/// 4325/// \param T The type of the expressions being copied. Both expressions must 4326/// have this type. 4327/// 4328/// \param To The expression we are copying to. 4329/// 4330/// \param From The expression we are copying from. 4331/// 4332/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4333/// Otherwise, it's a non-static member subobject. 4334/// 4335/// \param Depth Internal parameter recording the depth of the recursion. 4336/// 4337/// \returns A statement or a loop that copies the expressions. 4338static Sema::OwningStmtResult 4339BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4340 Sema::OwningExprResult To, Sema::OwningExprResult From, 4341 bool CopyingBaseSubobject, unsigned Depth = 0) { 4342 typedef Sema::OwningStmtResult OwningStmtResult; 4343 typedef Sema::OwningExprResult OwningExprResult; 4344 4345 // C++0x [class.copy]p30: 4346 // Each subobject is assigned in the manner appropriate to its type: 4347 // 4348 // - if the subobject is of class type, the copy assignment operator 4349 // for the class is used (as if by explicit qualification; that is, 4350 // ignoring any possible virtual overriding functions in more derived 4351 // classes); 4352 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4353 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4354 4355 // Look for operator=. 4356 DeclarationName Name 4357 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4358 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4359 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4360 4361 // Filter out any result that isn't a copy-assignment operator. 4362 LookupResult::Filter F = OpLookup.makeFilter(); 4363 while (F.hasNext()) { 4364 NamedDecl *D = F.next(); 4365 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4366 if (Method->isCopyAssignmentOperator()) 4367 continue; 4368 4369 F.erase(); 4370 } 4371 F.done(); 4372 4373 // Suppress the protected check (C++ [class.protected]) for each of the 4374 // assignment operators we found. This strange dance is required when 4375 // we're assigning via a base classes's copy-assignment operator. To 4376 // ensure that we're getting the right base class subobject (without 4377 // ambiguities), we need to cast "this" to that subobject type; to 4378 // ensure that we don't go through the virtual call mechanism, we need 4379 // to qualify the operator= name with the base class (see below). However, 4380 // this means that if the base class has a protected copy assignment 4381 // operator, the protected member access check will fail. So, we 4382 // rewrite "protected" access to "public" access in this case, since we 4383 // know by construction that we're calling from a derived class. 4384 if (CopyingBaseSubobject) { 4385 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4386 L != LEnd; ++L) { 4387 if (L.getAccess() == AS_protected) 4388 L.setAccess(AS_public); 4389 } 4390 } 4391 4392 // Create the nested-name-specifier that will be used to qualify the 4393 // reference to operator=; this is required to suppress the virtual 4394 // call mechanism. 4395 CXXScopeSpec SS; 4396 SS.setRange(Loc); 4397 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4398 T.getTypePtr())); 4399 4400 // Create the reference to operator=. 4401 OwningExprResult OpEqualRef 4402 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4403 /*FirstQualifierInScope=*/0, OpLookup, 4404 /*TemplateArgs=*/0, 4405 /*SuppressQualifierCheck=*/true); 4406 if (OpEqualRef.isInvalid()) 4407 return S.StmtError(); 4408 4409 // Build the call to the assignment operator. 4410 Expr *FromE = From.takeAs<Expr>(); 4411 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4412 OpEqualRef.takeAs<Expr>(), 4413 Loc, &FromE, 1, 0, Loc); 4414 if (Call.isInvalid()) 4415 return S.StmtError(); 4416 4417 return S.Owned(Call.takeAs<Stmt>()); 4418 } 4419 4420 // - if the subobject is of scalar type, the built-in assignment 4421 // operator is used. 4422 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4423 if (!ArrayTy) { 4424 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4425 BinaryOperator::Assign, 4426 To.takeAs<Expr>(), 4427 From.takeAs<Expr>()); 4428 if (Assignment.isInvalid()) 4429 return S.StmtError(); 4430 4431 return S.Owned(Assignment.takeAs<Stmt>()); 4432 } 4433 4434 // - if the subobject is an array, each element is assigned, in the 4435 // manner appropriate to the element type; 4436 4437 // Construct a loop over the array bounds, e.g., 4438 // 4439 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4440 // 4441 // that will copy each of the array elements. 4442 QualType SizeType = S.Context.getSizeType(); 4443 4444 // Create the iteration variable. 4445 IdentifierInfo *IterationVarName = 0; 4446 { 4447 llvm::SmallString<8> Str; 4448 llvm::raw_svector_ostream OS(Str); 4449 OS << "__i" << Depth; 4450 IterationVarName = &S.Context.Idents.get(OS.str()); 4451 } 4452 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4453 IterationVarName, SizeType, 4454 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4455 VarDecl::None, VarDecl::None); 4456 4457 // Initialize the iteration variable to zero. 4458 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4459 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4460 4461 // Create a reference to the iteration variable; we'll use this several 4462 // times throughout. 4463 Expr *IterationVarRef 4464 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4465 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4466 4467 // Create the DeclStmt that holds the iteration variable. 4468 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4469 4470 // Create the comparison against the array bound. 4471 llvm::APInt Upper = ArrayTy->getSize(); 4472 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4473 OwningExprResult Comparison 4474 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4475 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4476 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4477 4478 // Create the pre-increment of the iteration variable. 4479 OwningExprResult Increment 4480 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4481 UnaryOperator::PreInc, 4482 SizeType, Loc)); 4483 4484 // Subscript the "from" and "to" expressions with the iteration variable. 4485 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4486 S.Owned(IterationVarRef->Retain()), 4487 Loc); 4488 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4489 S.Owned(IterationVarRef->Retain()), 4490 Loc); 4491 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4492 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4493 4494 // Build the copy for an individual element of the array. 4495 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4496 ArrayTy->getElementType(), 4497 move(To), move(From), 4498 CopyingBaseSubobject, Depth+1); 4499 if (Copy.isInvalid()) { 4500 InitStmt->Destroy(S.Context); 4501 return S.StmtError(); 4502 } 4503 4504 // Construct the loop that copies all elements of this array. 4505 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4506 S.MakeFullExpr(Comparison), 4507 Sema::DeclPtrTy(), 4508 S.MakeFullExpr(Increment), 4509 Loc, move(Copy)); 4510} 4511 4512void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4513 CXXMethodDecl *CopyAssignOperator) { 4514 assert((CopyAssignOperator->isImplicit() && 4515 CopyAssignOperator->isOverloadedOperator() && 4516 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4517 !CopyAssignOperator->isUsed(false)) && 4518 "DefineImplicitCopyAssignment called for wrong function"); 4519 4520 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4521 4522 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4523 CopyAssignOperator->setInvalidDecl(); 4524 return; 4525 } 4526 4527 CopyAssignOperator->setUsed(); 4528 4529 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4530 ErrorTrap Trap(*this); 4531 4532 // C++0x [class.copy]p30: 4533 // The implicitly-defined or explicitly-defaulted copy assignment operator 4534 // for a non-union class X performs memberwise copy assignment of its 4535 // subobjects. The direct base classes of X are assigned first, in the 4536 // order of their declaration in the base-specifier-list, and then the 4537 // immediate non-static data members of X are assigned, in the order in 4538 // which they were declared in the class definition. 4539 4540 // The statements that form the synthesized function body. 4541 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4542 4543 // The parameter for the "other" object, which we are copying from. 4544 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4545 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4546 QualType OtherRefType = Other->getType(); 4547 if (const LValueReferenceType *OtherRef 4548 = OtherRefType->getAs<LValueReferenceType>()) { 4549 OtherRefType = OtherRef->getPointeeType(); 4550 OtherQuals = OtherRefType.getQualifiers(); 4551 } 4552 4553 // Our location for everything implicitly-generated. 4554 SourceLocation Loc = CopyAssignOperator->getLocation(); 4555 4556 // Construct a reference to the "other" object. We'll be using this 4557 // throughout the generated ASTs. 4558 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4559 assert(OtherRef && "Reference to parameter cannot fail!"); 4560 4561 // Construct the "this" pointer. We'll be using this throughout the generated 4562 // ASTs. 4563 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4564 assert(This && "Reference to this cannot fail!"); 4565 4566 // Assign base classes. 4567 bool Invalid = false; 4568 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4569 E = ClassDecl->bases_end(); Base != E; ++Base) { 4570 // Form the assignment: 4571 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4572 QualType BaseType = Base->getType().getUnqualifiedType(); 4573 CXXRecordDecl *BaseClassDecl = 0; 4574 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4575 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4576 else { 4577 Invalid = true; 4578 continue; 4579 } 4580 4581 // Construct the "from" expression, which is an implicit cast to the 4582 // appropriately-qualified base type. 4583 Expr *From = OtherRef->Retain(); 4584 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4585 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4586 CXXBaseSpecifierArray(Base)); 4587 4588 // Dereference "this". 4589 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4590 Owned(This->Retain())); 4591 4592 // Implicitly cast "this" to the appropriately-qualified base type. 4593 Expr *ToE = To.takeAs<Expr>(); 4594 ImpCastExprToType(ToE, 4595 Context.getCVRQualifiedType(BaseType, 4596 CopyAssignOperator->getTypeQualifiers()), 4597 CastExpr::CK_UncheckedDerivedToBase, 4598 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4599 To = Owned(ToE); 4600 4601 // Build the copy. 4602 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4603 move(To), Owned(From), 4604 /*CopyingBaseSubobject=*/true); 4605 if (Copy.isInvalid()) { 4606 Diag(CurrentLocation, diag::note_member_synthesized_at) 4607 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4608 CopyAssignOperator->setInvalidDecl(); 4609 return; 4610 } 4611 4612 // Success! Record the copy. 4613 Statements.push_back(Copy.takeAs<Expr>()); 4614 } 4615 4616 // \brief Reference to the __builtin_memcpy function. 4617 Expr *BuiltinMemCpyRef = 0; 4618 // \brief Reference to the __builtin_objc_memmove_collectable function. 4619 Expr *CollectableMemCpyRef = 0; 4620 4621 // Assign non-static members. 4622 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4623 FieldEnd = ClassDecl->field_end(); 4624 Field != FieldEnd; ++Field) { 4625 // Check for members of reference type; we can't copy those. 4626 if (Field->getType()->isReferenceType()) { 4627 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4628 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4629 Diag(Field->getLocation(), diag::note_declared_at); 4630 Diag(CurrentLocation, diag::note_member_synthesized_at) 4631 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4632 Invalid = true; 4633 continue; 4634 } 4635 4636 // Check for members of const-qualified, non-class type. 4637 QualType BaseType = Context.getBaseElementType(Field->getType()); 4638 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4639 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4640 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4641 Diag(Field->getLocation(), diag::note_declared_at); 4642 Diag(CurrentLocation, diag::note_member_synthesized_at) 4643 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4644 Invalid = true; 4645 continue; 4646 } 4647 4648 QualType FieldType = Field->getType().getNonReferenceType(); 4649 if (FieldType->isIncompleteArrayType()) { 4650 assert(ClassDecl->hasFlexibleArrayMember() && 4651 "Incomplete array type is not valid"); 4652 continue; 4653 } 4654 4655 // Build references to the field in the object we're copying from and to. 4656 CXXScopeSpec SS; // Intentionally empty 4657 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4658 LookupMemberName); 4659 MemberLookup.addDecl(*Field); 4660 MemberLookup.resolveKind(); 4661 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4662 OtherRefType, 4663 Loc, /*IsArrow=*/false, 4664 SS, 0, MemberLookup, 0); 4665 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4666 This->getType(), 4667 Loc, /*IsArrow=*/true, 4668 SS, 0, MemberLookup, 0); 4669 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4670 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4671 4672 // If the field should be copied with __builtin_memcpy rather than via 4673 // explicit assignments, do so. This optimization only applies for arrays 4674 // of scalars and arrays of class type with trivial copy-assignment 4675 // operators. 4676 if (FieldType->isArrayType() && 4677 (!BaseType->isRecordType() || 4678 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4679 ->hasTrivialCopyAssignment())) { 4680 // Compute the size of the memory buffer to be copied. 4681 QualType SizeType = Context.getSizeType(); 4682 llvm::APInt Size(Context.getTypeSize(SizeType), 4683 Context.getTypeSizeInChars(BaseType).getQuantity()); 4684 for (const ConstantArrayType *Array 4685 = Context.getAsConstantArrayType(FieldType); 4686 Array; 4687 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4688 llvm::APInt ArraySize = Array->getSize(); 4689 ArraySize.zextOrTrunc(Size.getBitWidth()); 4690 Size *= ArraySize; 4691 } 4692 4693 // Take the address of the field references for "from" and "to". 4694 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4695 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4696 4697 bool NeedsCollectableMemCpy = 4698 (BaseType->isRecordType() && 4699 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4700 4701 if (NeedsCollectableMemCpy) { 4702 if (!CollectableMemCpyRef) { 4703 // Create a reference to the __builtin_objc_memmove_collectable function. 4704 LookupResult R(*this, 4705 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4706 Loc, LookupOrdinaryName); 4707 LookupName(R, TUScope, true); 4708 4709 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4710 if (!CollectableMemCpy) { 4711 // Something went horribly wrong earlier, and we will have 4712 // complained about it. 4713 Invalid = true; 4714 continue; 4715 } 4716 4717 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4718 CollectableMemCpy->getType(), 4719 Loc, 0).takeAs<Expr>(); 4720 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4721 } 4722 } 4723 // Create a reference to the __builtin_memcpy builtin function. 4724 else if (!BuiltinMemCpyRef) { 4725 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4726 LookupOrdinaryName); 4727 LookupName(R, TUScope, true); 4728 4729 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4730 if (!BuiltinMemCpy) { 4731 // Something went horribly wrong earlier, and we will have complained 4732 // about it. 4733 Invalid = true; 4734 continue; 4735 } 4736 4737 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4738 BuiltinMemCpy->getType(), 4739 Loc, 0).takeAs<Expr>(); 4740 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4741 } 4742 4743 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4744 CallArgs.push_back(To.takeAs<Expr>()); 4745 CallArgs.push_back(From.takeAs<Expr>()); 4746 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4747 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4748 Commas.push_back(Loc); 4749 Commas.push_back(Loc); 4750 OwningExprResult Call = ExprError(); 4751 if (NeedsCollectableMemCpy) 4752 Call = ActOnCallExpr(/*Scope=*/0, 4753 Owned(CollectableMemCpyRef->Retain()), 4754 Loc, move_arg(CallArgs), 4755 Commas.data(), Loc); 4756 else 4757 Call = ActOnCallExpr(/*Scope=*/0, 4758 Owned(BuiltinMemCpyRef->Retain()), 4759 Loc, move_arg(CallArgs), 4760 Commas.data(), Loc); 4761 4762 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4763 Statements.push_back(Call.takeAs<Expr>()); 4764 continue; 4765 } 4766 4767 // Build the copy of this field. 4768 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4769 move(To), move(From), 4770 /*CopyingBaseSubobject=*/false); 4771 if (Copy.isInvalid()) { 4772 Diag(CurrentLocation, diag::note_member_synthesized_at) 4773 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4774 CopyAssignOperator->setInvalidDecl(); 4775 return; 4776 } 4777 4778 // Success! Record the copy. 4779 Statements.push_back(Copy.takeAs<Stmt>()); 4780 } 4781 4782 if (!Invalid) { 4783 // Add a "return *this;" 4784 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4785 Owned(This->Retain())); 4786 4787 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4788 if (Return.isInvalid()) 4789 Invalid = true; 4790 else { 4791 Statements.push_back(Return.takeAs<Stmt>()); 4792 4793 if (Trap.hasErrorOccurred()) { 4794 Diag(CurrentLocation, diag::note_member_synthesized_at) 4795 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4796 Invalid = true; 4797 } 4798 } 4799 } 4800 4801 if (Invalid) { 4802 CopyAssignOperator->setInvalidDecl(); 4803 return; 4804 } 4805 4806 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4807 /*isStmtExpr=*/false); 4808 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4809 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4810} 4811 4812void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4813 CXXConstructorDecl *CopyConstructor, 4814 unsigned TypeQuals) { 4815 assert((CopyConstructor->isImplicit() && 4816 CopyConstructor->isCopyConstructor(TypeQuals) && 4817 !CopyConstructor->isUsed(false)) && 4818 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4819 4820 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4821 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4822 4823 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4824 ErrorTrap Trap(*this); 4825 4826 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4827 Trap.hasErrorOccurred()) { 4828 Diag(CurrentLocation, diag::note_member_synthesized_at) 4829 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4830 CopyConstructor->setInvalidDecl(); 4831 } else { 4832 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4833 CopyConstructor->getLocation(), 4834 MultiStmtArg(*this, 0, 0), 4835 /*isStmtExpr=*/false) 4836 .takeAs<Stmt>()); 4837 } 4838 4839 CopyConstructor->setUsed(); 4840} 4841 4842Sema::OwningExprResult 4843Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4844 CXXConstructorDecl *Constructor, 4845 MultiExprArg ExprArgs, 4846 bool RequiresZeroInit, 4847 CXXConstructExpr::ConstructionKind ConstructKind) { 4848 bool Elidable = false; 4849 4850 // C++0x [class.copy]p34: 4851 // When certain criteria are met, an implementation is allowed to 4852 // omit the copy/move construction of a class object, even if the 4853 // copy/move constructor and/or destructor for the object have 4854 // side effects. [...] 4855 // - when a temporary class object that has not been bound to a 4856 // reference (12.2) would be copied/moved to a class object 4857 // with the same cv-unqualified type, the copy/move operation 4858 // can be omitted by constructing the temporary object 4859 // directly into the target of the omitted copy/move 4860 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4861 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4862 Elidable = SubExpr->isTemporaryObject() && 4863 Context.hasSameUnqualifiedType(SubExpr->getType(), 4864 Context.getTypeDeclType(Constructor->getParent())); 4865 } 4866 4867 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4868 Elidable, move(ExprArgs), RequiresZeroInit, 4869 ConstructKind); 4870} 4871 4872/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4873/// including handling of its default argument expressions. 4874Sema::OwningExprResult 4875Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4876 CXXConstructorDecl *Constructor, bool Elidable, 4877 MultiExprArg ExprArgs, 4878 bool RequiresZeroInit, 4879 CXXConstructExpr::ConstructionKind ConstructKind) { 4880 unsigned NumExprs = ExprArgs.size(); 4881 Expr **Exprs = (Expr **)ExprArgs.release(); 4882 4883 MarkDeclarationReferenced(ConstructLoc, Constructor); 4884 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4885 Constructor, Elidable, Exprs, NumExprs, 4886 RequiresZeroInit, ConstructKind)); 4887} 4888 4889bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4890 CXXConstructorDecl *Constructor, 4891 MultiExprArg Exprs) { 4892 OwningExprResult TempResult = 4893 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4894 move(Exprs)); 4895 if (TempResult.isInvalid()) 4896 return true; 4897 4898 Expr *Temp = TempResult.takeAs<Expr>(); 4899 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4900 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4901 VD->setInit(Temp); 4902 4903 return false; 4904} 4905 4906void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4907 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4908 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4909 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4910 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4911 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4912 CheckDestructorAccess(VD->getLocation(), Destructor, 4913 PDiag(diag::err_access_dtor_var) 4914 << VD->getDeclName() 4915 << VD->getType()); 4916 } 4917} 4918 4919/// AddCXXDirectInitializerToDecl - This action is called immediately after 4920/// ActOnDeclarator, when a C++ direct initializer is present. 4921/// e.g: "int x(1);" 4922void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4923 SourceLocation LParenLoc, 4924 MultiExprArg Exprs, 4925 SourceLocation *CommaLocs, 4926 SourceLocation RParenLoc) { 4927 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4928 Decl *RealDecl = Dcl.getAs<Decl>(); 4929 4930 // If there is no declaration, there was an error parsing it. Just ignore 4931 // the initializer. 4932 if (RealDecl == 0) 4933 return; 4934 4935 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4936 if (!VDecl) { 4937 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4938 RealDecl->setInvalidDecl(); 4939 return; 4940 } 4941 4942 // We will represent direct-initialization similarly to copy-initialization: 4943 // int x(1); -as-> int x = 1; 4944 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4945 // 4946 // Clients that want to distinguish between the two forms, can check for 4947 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4948 // A major benefit is that clients that don't particularly care about which 4949 // exactly form was it (like the CodeGen) can handle both cases without 4950 // special case code. 4951 4952 // C++ 8.5p11: 4953 // The form of initialization (using parentheses or '=') is generally 4954 // insignificant, but does matter when the entity being initialized has a 4955 // class type. 4956 QualType DeclInitType = VDecl->getType(); 4957 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4958 DeclInitType = Context.getBaseElementType(Array); 4959 4960 if (!VDecl->getType()->isDependentType() && 4961 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4962 diag::err_typecheck_decl_incomplete_type)) { 4963 VDecl->setInvalidDecl(); 4964 return; 4965 } 4966 4967 // The variable can not have an abstract class type. 4968 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4969 diag::err_abstract_type_in_decl, 4970 AbstractVariableType)) 4971 VDecl->setInvalidDecl(); 4972 4973 const VarDecl *Def; 4974 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4975 Diag(VDecl->getLocation(), diag::err_redefinition) 4976 << VDecl->getDeclName(); 4977 Diag(Def->getLocation(), diag::note_previous_definition); 4978 VDecl->setInvalidDecl(); 4979 return; 4980 } 4981 4982 // If either the declaration has a dependent type or if any of the 4983 // expressions is type-dependent, we represent the initialization 4984 // via a ParenListExpr for later use during template instantiation. 4985 if (VDecl->getType()->isDependentType() || 4986 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4987 // Let clients know that initialization was done with a direct initializer. 4988 VDecl->setCXXDirectInitializer(true); 4989 4990 // Store the initialization expressions as a ParenListExpr. 4991 unsigned NumExprs = Exprs.size(); 4992 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4993 (Expr **)Exprs.release(), 4994 NumExprs, RParenLoc)); 4995 return; 4996 } 4997 4998 // Capture the variable that is being initialized and the style of 4999 // initialization. 5000 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5001 5002 // FIXME: Poor source location information. 5003 InitializationKind Kind 5004 = InitializationKind::CreateDirect(VDecl->getLocation(), 5005 LParenLoc, RParenLoc); 5006 5007 InitializationSequence InitSeq(*this, Entity, Kind, 5008 (Expr**)Exprs.get(), Exprs.size()); 5009 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5010 if (Result.isInvalid()) { 5011 VDecl->setInvalidDecl(); 5012 return; 5013 } 5014 5015 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5016 VDecl->setInit(Result.takeAs<Expr>()); 5017 VDecl->setCXXDirectInitializer(true); 5018 5019 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5020 FinalizeVarWithDestructor(VDecl, Record); 5021} 5022 5023/// \brief Given a constructor and the set of arguments provided for the 5024/// constructor, convert the arguments and add any required default arguments 5025/// to form a proper call to this constructor. 5026/// 5027/// \returns true if an error occurred, false otherwise. 5028bool 5029Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5030 MultiExprArg ArgsPtr, 5031 SourceLocation Loc, 5032 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5033 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5034 unsigned NumArgs = ArgsPtr.size(); 5035 Expr **Args = (Expr **)ArgsPtr.get(); 5036 5037 const FunctionProtoType *Proto 5038 = Constructor->getType()->getAs<FunctionProtoType>(); 5039 assert(Proto && "Constructor without a prototype?"); 5040 unsigned NumArgsInProto = Proto->getNumArgs(); 5041 5042 // If too few arguments are available, we'll fill in the rest with defaults. 5043 if (NumArgs < NumArgsInProto) 5044 ConvertedArgs.reserve(NumArgsInProto); 5045 else 5046 ConvertedArgs.reserve(NumArgs); 5047 5048 VariadicCallType CallType = 5049 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5050 llvm::SmallVector<Expr *, 8> AllArgs; 5051 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5052 Proto, 0, Args, NumArgs, AllArgs, 5053 CallType); 5054 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5055 ConvertedArgs.push_back(AllArgs[i]); 5056 return Invalid; 5057} 5058 5059static inline bool 5060CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5061 const FunctionDecl *FnDecl) { 5062 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5063 if (isa<NamespaceDecl>(DC)) { 5064 return SemaRef.Diag(FnDecl->getLocation(), 5065 diag::err_operator_new_delete_declared_in_namespace) 5066 << FnDecl->getDeclName(); 5067 } 5068 5069 if (isa<TranslationUnitDecl>(DC) && 5070 FnDecl->getStorageClass() == FunctionDecl::Static) { 5071 return SemaRef.Diag(FnDecl->getLocation(), 5072 diag::err_operator_new_delete_declared_static) 5073 << FnDecl->getDeclName(); 5074 } 5075 5076 return false; 5077} 5078 5079static inline bool 5080CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5081 CanQualType ExpectedResultType, 5082 CanQualType ExpectedFirstParamType, 5083 unsigned DependentParamTypeDiag, 5084 unsigned InvalidParamTypeDiag) { 5085 QualType ResultType = 5086 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5087 5088 // Check that the result type is not dependent. 5089 if (ResultType->isDependentType()) 5090 return SemaRef.Diag(FnDecl->getLocation(), 5091 diag::err_operator_new_delete_dependent_result_type) 5092 << FnDecl->getDeclName() << ExpectedResultType; 5093 5094 // Check that the result type is what we expect. 5095 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5096 return SemaRef.Diag(FnDecl->getLocation(), 5097 diag::err_operator_new_delete_invalid_result_type) 5098 << FnDecl->getDeclName() << ExpectedResultType; 5099 5100 // A function template must have at least 2 parameters. 5101 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5102 return SemaRef.Diag(FnDecl->getLocation(), 5103 diag::err_operator_new_delete_template_too_few_parameters) 5104 << FnDecl->getDeclName(); 5105 5106 // The function decl must have at least 1 parameter. 5107 if (FnDecl->getNumParams() == 0) 5108 return SemaRef.Diag(FnDecl->getLocation(), 5109 diag::err_operator_new_delete_too_few_parameters) 5110 << FnDecl->getDeclName(); 5111 5112 // Check the the first parameter type is not dependent. 5113 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5114 if (FirstParamType->isDependentType()) 5115 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5116 << FnDecl->getDeclName() << ExpectedFirstParamType; 5117 5118 // Check that the first parameter type is what we expect. 5119 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5120 ExpectedFirstParamType) 5121 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5122 << FnDecl->getDeclName() << ExpectedFirstParamType; 5123 5124 return false; 5125} 5126 5127static bool 5128CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5129 // C++ [basic.stc.dynamic.allocation]p1: 5130 // A program is ill-formed if an allocation function is declared in a 5131 // namespace scope other than global scope or declared static in global 5132 // scope. 5133 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5134 return true; 5135 5136 CanQualType SizeTy = 5137 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5138 5139 // C++ [basic.stc.dynamic.allocation]p1: 5140 // The return type shall be void*. The first parameter shall have type 5141 // std::size_t. 5142 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5143 SizeTy, 5144 diag::err_operator_new_dependent_param_type, 5145 diag::err_operator_new_param_type)) 5146 return true; 5147 5148 // C++ [basic.stc.dynamic.allocation]p1: 5149 // The first parameter shall not have an associated default argument. 5150 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5151 return SemaRef.Diag(FnDecl->getLocation(), 5152 diag::err_operator_new_default_arg) 5153 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5154 5155 return false; 5156} 5157 5158static bool 5159CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5160 // C++ [basic.stc.dynamic.deallocation]p1: 5161 // A program is ill-formed if deallocation functions are declared in a 5162 // namespace scope other than global scope or declared static in global 5163 // scope. 5164 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5165 return true; 5166 5167 // C++ [basic.stc.dynamic.deallocation]p2: 5168 // Each deallocation function shall return void and its first parameter 5169 // shall be void*. 5170 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5171 SemaRef.Context.VoidPtrTy, 5172 diag::err_operator_delete_dependent_param_type, 5173 diag::err_operator_delete_param_type)) 5174 return true; 5175 5176 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5177 if (FirstParamType->isDependentType()) 5178 return SemaRef.Diag(FnDecl->getLocation(), 5179 diag::err_operator_delete_dependent_param_type) 5180 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5181 5182 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5183 SemaRef.Context.VoidPtrTy) 5184 return SemaRef.Diag(FnDecl->getLocation(), 5185 diag::err_operator_delete_param_type) 5186 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5187 5188 return false; 5189} 5190 5191/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5192/// of this overloaded operator is well-formed. If so, returns false; 5193/// otherwise, emits appropriate diagnostics and returns true. 5194bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5195 assert(FnDecl && FnDecl->isOverloadedOperator() && 5196 "Expected an overloaded operator declaration"); 5197 5198 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5199 5200 // C++ [over.oper]p5: 5201 // The allocation and deallocation functions, operator new, 5202 // operator new[], operator delete and operator delete[], are 5203 // described completely in 3.7.3. The attributes and restrictions 5204 // found in the rest of this subclause do not apply to them unless 5205 // explicitly stated in 3.7.3. 5206 if (Op == OO_Delete || Op == OO_Array_Delete) 5207 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5208 5209 if (Op == OO_New || Op == OO_Array_New) 5210 return CheckOperatorNewDeclaration(*this, FnDecl); 5211 5212 // C++ [over.oper]p6: 5213 // An operator function shall either be a non-static member 5214 // function or be a non-member function and have at least one 5215 // parameter whose type is a class, a reference to a class, an 5216 // enumeration, or a reference to an enumeration. 5217 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5218 if (MethodDecl->isStatic()) 5219 return Diag(FnDecl->getLocation(), 5220 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5221 } else { 5222 bool ClassOrEnumParam = false; 5223 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5224 ParamEnd = FnDecl->param_end(); 5225 Param != ParamEnd; ++Param) { 5226 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5227 if (ParamType->isDependentType() || ParamType->isRecordType() || 5228 ParamType->isEnumeralType()) { 5229 ClassOrEnumParam = true; 5230 break; 5231 } 5232 } 5233 5234 if (!ClassOrEnumParam) 5235 return Diag(FnDecl->getLocation(), 5236 diag::err_operator_overload_needs_class_or_enum) 5237 << FnDecl->getDeclName(); 5238 } 5239 5240 // C++ [over.oper]p8: 5241 // An operator function cannot have default arguments (8.3.6), 5242 // except where explicitly stated below. 5243 // 5244 // Only the function-call operator allows default arguments 5245 // (C++ [over.call]p1). 5246 if (Op != OO_Call) { 5247 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5248 Param != FnDecl->param_end(); ++Param) { 5249 if ((*Param)->hasDefaultArg()) 5250 return Diag((*Param)->getLocation(), 5251 diag::err_operator_overload_default_arg) 5252 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5253 } 5254 } 5255 5256 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5257 { false, false, false } 5258#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5259 , { Unary, Binary, MemberOnly } 5260#include "clang/Basic/OperatorKinds.def" 5261 }; 5262 5263 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5264 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5265 bool MustBeMemberOperator = OperatorUses[Op][2]; 5266 5267 // C++ [over.oper]p8: 5268 // [...] Operator functions cannot have more or fewer parameters 5269 // than the number required for the corresponding operator, as 5270 // described in the rest of this subclause. 5271 unsigned NumParams = FnDecl->getNumParams() 5272 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5273 if (Op != OO_Call && 5274 ((NumParams == 1 && !CanBeUnaryOperator) || 5275 (NumParams == 2 && !CanBeBinaryOperator) || 5276 (NumParams < 1) || (NumParams > 2))) { 5277 // We have the wrong number of parameters. 5278 unsigned ErrorKind; 5279 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5280 ErrorKind = 2; // 2 -> unary or binary. 5281 } else if (CanBeUnaryOperator) { 5282 ErrorKind = 0; // 0 -> unary 5283 } else { 5284 assert(CanBeBinaryOperator && 5285 "All non-call overloaded operators are unary or binary!"); 5286 ErrorKind = 1; // 1 -> binary 5287 } 5288 5289 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5290 << FnDecl->getDeclName() << NumParams << ErrorKind; 5291 } 5292 5293 // Overloaded operators other than operator() cannot be variadic. 5294 if (Op != OO_Call && 5295 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5296 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5297 << FnDecl->getDeclName(); 5298 } 5299 5300 // Some operators must be non-static member functions. 5301 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5302 return Diag(FnDecl->getLocation(), 5303 diag::err_operator_overload_must_be_member) 5304 << FnDecl->getDeclName(); 5305 } 5306 5307 // C++ [over.inc]p1: 5308 // The user-defined function called operator++ implements the 5309 // prefix and postfix ++ operator. If this function is a member 5310 // function with no parameters, or a non-member function with one 5311 // parameter of class or enumeration type, it defines the prefix 5312 // increment operator ++ for objects of that type. If the function 5313 // is a member function with one parameter (which shall be of type 5314 // int) or a non-member function with two parameters (the second 5315 // of which shall be of type int), it defines the postfix 5316 // increment operator ++ for objects of that type. 5317 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5318 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5319 bool ParamIsInt = false; 5320 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5321 ParamIsInt = BT->getKind() == BuiltinType::Int; 5322 5323 if (!ParamIsInt) 5324 return Diag(LastParam->getLocation(), 5325 diag::err_operator_overload_post_incdec_must_be_int) 5326 << LastParam->getType() << (Op == OO_MinusMinus); 5327 } 5328 5329 // Notify the class if it got an assignment operator. 5330 if (Op == OO_Equal) { 5331 // Would have returned earlier otherwise. 5332 assert(isa<CXXMethodDecl>(FnDecl) && 5333 "Overloaded = not member, but not filtered."); 5334 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5335 Method->getParent()->addedAssignmentOperator(Context, Method); 5336 } 5337 5338 return false; 5339} 5340 5341/// CheckLiteralOperatorDeclaration - Check whether the declaration 5342/// of this literal operator function is well-formed. If so, returns 5343/// false; otherwise, emits appropriate diagnostics and returns true. 5344bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5345 DeclContext *DC = FnDecl->getDeclContext(); 5346 Decl::Kind Kind = DC->getDeclKind(); 5347 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5348 Kind != Decl::LinkageSpec) { 5349 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5350 << FnDecl->getDeclName(); 5351 return true; 5352 } 5353 5354 bool Valid = false; 5355 5356 // template <char...> type operator "" name() is the only valid template 5357 // signature, and the only valid signature with no parameters. 5358 if (FnDecl->param_size() == 0) { 5359 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5360 // Must have only one template parameter 5361 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5362 if (Params->size() == 1) { 5363 NonTypeTemplateParmDecl *PmDecl = 5364 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5365 5366 // The template parameter must be a char parameter pack. 5367 // FIXME: This test will always fail because non-type parameter packs 5368 // have not been implemented. 5369 if (PmDecl && PmDecl->isTemplateParameterPack() && 5370 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5371 Valid = true; 5372 } 5373 } 5374 } else { 5375 // Check the first parameter 5376 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5377 5378 QualType T = (*Param)->getType(); 5379 5380 // unsigned long long int, long double, and any character type are allowed 5381 // as the only parameters. 5382 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5383 Context.hasSameType(T, Context.LongDoubleTy) || 5384 Context.hasSameType(T, Context.CharTy) || 5385 Context.hasSameType(T, Context.WCharTy) || 5386 Context.hasSameType(T, Context.Char16Ty) || 5387 Context.hasSameType(T, Context.Char32Ty)) { 5388 if (++Param == FnDecl->param_end()) 5389 Valid = true; 5390 goto FinishedParams; 5391 } 5392 5393 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5394 const PointerType *PT = T->getAs<PointerType>(); 5395 if (!PT) 5396 goto FinishedParams; 5397 T = PT->getPointeeType(); 5398 if (!T.isConstQualified()) 5399 goto FinishedParams; 5400 T = T.getUnqualifiedType(); 5401 5402 // Move on to the second parameter; 5403 ++Param; 5404 5405 // If there is no second parameter, the first must be a const char * 5406 if (Param == FnDecl->param_end()) { 5407 if (Context.hasSameType(T, Context.CharTy)) 5408 Valid = true; 5409 goto FinishedParams; 5410 } 5411 5412 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5413 // are allowed as the first parameter to a two-parameter function 5414 if (!(Context.hasSameType(T, Context.CharTy) || 5415 Context.hasSameType(T, Context.WCharTy) || 5416 Context.hasSameType(T, Context.Char16Ty) || 5417 Context.hasSameType(T, Context.Char32Ty))) 5418 goto FinishedParams; 5419 5420 // The second and final parameter must be an std::size_t 5421 T = (*Param)->getType().getUnqualifiedType(); 5422 if (Context.hasSameType(T, Context.getSizeType()) && 5423 ++Param == FnDecl->param_end()) 5424 Valid = true; 5425 } 5426 5427 // FIXME: This diagnostic is absolutely terrible. 5428FinishedParams: 5429 if (!Valid) { 5430 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5431 << FnDecl->getDeclName(); 5432 return true; 5433 } 5434 5435 return false; 5436} 5437 5438/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5439/// linkage specification, including the language and (if present) 5440/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5441/// the location of the language string literal, which is provided 5442/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5443/// the '{' brace. Otherwise, this linkage specification does not 5444/// have any braces. 5445Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5446 SourceLocation ExternLoc, 5447 SourceLocation LangLoc, 5448 llvm::StringRef Lang, 5449 SourceLocation LBraceLoc) { 5450 LinkageSpecDecl::LanguageIDs Language; 5451 if (Lang == "\"C\"") 5452 Language = LinkageSpecDecl::lang_c; 5453 else if (Lang == "\"C++\"") 5454 Language = LinkageSpecDecl::lang_cxx; 5455 else { 5456 Diag(LangLoc, diag::err_bad_language); 5457 return DeclPtrTy(); 5458 } 5459 5460 // FIXME: Add all the various semantics of linkage specifications 5461 5462 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5463 LangLoc, Language, 5464 LBraceLoc.isValid()); 5465 CurContext->addDecl(D); 5466 PushDeclContext(S, D); 5467 return DeclPtrTy::make(D); 5468} 5469 5470/// ActOnFinishLinkageSpecification - Completely the definition of 5471/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5472/// valid, it's the position of the closing '}' brace in a linkage 5473/// specification that uses braces. 5474Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5475 DeclPtrTy LinkageSpec, 5476 SourceLocation RBraceLoc) { 5477 if (LinkageSpec) 5478 PopDeclContext(); 5479 return LinkageSpec; 5480} 5481 5482/// \brief Perform semantic analysis for the variable declaration that 5483/// occurs within a C++ catch clause, returning the newly-created 5484/// variable. 5485VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5486 TypeSourceInfo *TInfo, 5487 IdentifierInfo *Name, 5488 SourceLocation Loc, 5489 SourceRange Range) { 5490 bool Invalid = false; 5491 5492 // Arrays and functions decay. 5493 if (ExDeclType->isArrayType()) 5494 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5495 else if (ExDeclType->isFunctionType()) 5496 ExDeclType = Context.getPointerType(ExDeclType); 5497 5498 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5499 // The exception-declaration shall not denote a pointer or reference to an 5500 // incomplete type, other than [cv] void*. 5501 // N2844 forbids rvalue references. 5502 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5503 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5504 Invalid = true; 5505 } 5506 5507 // GCC allows catching pointers and references to incomplete types 5508 // as an extension; so do we, but we warn by default. 5509 5510 QualType BaseType = ExDeclType; 5511 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5512 unsigned DK = diag::err_catch_incomplete; 5513 bool IncompleteCatchIsInvalid = true; 5514 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5515 BaseType = Ptr->getPointeeType(); 5516 Mode = 1; 5517 DK = diag::ext_catch_incomplete_ptr; 5518 IncompleteCatchIsInvalid = false; 5519 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5520 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5521 BaseType = Ref->getPointeeType(); 5522 Mode = 2; 5523 DK = diag::ext_catch_incomplete_ref; 5524 IncompleteCatchIsInvalid = false; 5525 } 5526 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5527 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5528 IncompleteCatchIsInvalid) 5529 Invalid = true; 5530 5531 if (!Invalid && !ExDeclType->isDependentType() && 5532 RequireNonAbstractType(Loc, ExDeclType, 5533 diag::err_abstract_type_in_decl, 5534 AbstractVariableType)) 5535 Invalid = true; 5536 5537 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5538 Name, ExDeclType, TInfo, VarDecl::None, 5539 VarDecl::None); 5540 ExDecl->setExceptionVariable(true); 5541 5542 if (!Invalid) { 5543 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5544 // C++ [except.handle]p16: 5545 // The object declared in an exception-declaration or, if the 5546 // exception-declaration does not specify a name, a temporary (12.2) is 5547 // copy-initialized (8.5) from the exception object. [...] 5548 // The object is destroyed when the handler exits, after the destruction 5549 // of any automatic objects initialized within the handler. 5550 // 5551 // We just pretend to initialize the object with itself, then make sure 5552 // it can be destroyed later. 5553 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5554 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5555 Loc, ExDeclType, 0); 5556 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5557 SourceLocation()); 5558 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5559 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5560 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5561 if (Result.isInvalid()) 5562 Invalid = true; 5563 else 5564 FinalizeVarWithDestructor(ExDecl, RecordTy); 5565 } 5566 } 5567 5568 if (Invalid) 5569 ExDecl->setInvalidDecl(); 5570 5571 return ExDecl; 5572} 5573 5574/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5575/// handler. 5576Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5577 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5578 QualType ExDeclType = TInfo->getType(); 5579 5580 bool Invalid = D.isInvalidType(); 5581 IdentifierInfo *II = D.getIdentifier(); 5582 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5583 LookupOrdinaryName, 5584 ForRedeclaration)) { 5585 // The scope should be freshly made just for us. There is just no way 5586 // it contains any previous declaration. 5587 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5588 if (PrevDecl->isTemplateParameter()) { 5589 // Maybe we will complain about the shadowed template parameter. 5590 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5591 } 5592 } 5593 5594 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5595 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5596 << D.getCXXScopeSpec().getRange(); 5597 Invalid = true; 5598 } 5599 5600 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5601 D.getIdentifier(), 5602 D.getIdentifierLoc(), 5603 D.getDeclSpec().getSourceRange()); 5604 5605 if (Invalid) 5606 ExDecl->setInvalidDecl(); 5607 5608 // Add the exception declaration into this scope. 5609 if (II) 5610 PushOnScopeChains(ExDecl, S); 5611 else 5612 CurContext->addDecl(ExDecl); 5613 5614 ProcessDeclAttributes(S, ExDecl, D); 5615 return DeclPtrTy::make(ExDecl); 5616} 5617 5618Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5619 ExprArg assertexpr, 5620 ExprArg assertmessageexpr) { 5621 Expr *AssertExpr = (Expr *)assertexpr.get(); 5622 StringLiteral *AssertMessage = 5623 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5624 5625 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5626 llvm::APSInt Value(32); 5627 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5628 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5629 AssertExpr->getSourceRange(); 5630 return DeclPtrTy(); 5631 } 5632 5633 if (Value == 0) { 5634 Diag(AssertLoc, diag::err_static_assert_failed) 5635 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5636 } 5637 } 5638 5639 assertexpr.release(); 5640 assertmessageexpr.release(); 5641 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5642 AssertExpr, AssertMessage); 5643 5644 CurContext->addDecl(Decl); 5645 return DeclPtrTy::make(Decl); 5646} 5647 5648/// \brief Perform semantic analysis of the given friend type declaration. 5649/// 5650/// \returns A friend declaration that. 5651FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5652 TypeSourceInfo *TSInfo) { 5653 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5654 5655 QualType T = TSInfo->getType(); 5656 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5657 5658 if (!getLangOptions().CPlusPlus0x) { 5659 // C++03 [class.friend]p2: 5660 // An elaborated-type-specifier shall be used in a friend declaration 5661 // for a class.* 5662 // 5663 // * The class-key of the elaborated-type-specifier is required. 5664 if (!ActiveTemplateInstantiations.empty()) { 5665 // Do not complain about the form of friend template types during 5666 // template instantiation; we will already have complained when the 5667 // template was declared. 5668 } else if (!T->isElaboratedTypeSpecifier()) { 5669 // If we evaluated the type to a record type, suggest putting 5670 // a tag in front. 5671 if (const RecordType *RT = T->getAs<RecordType>()) { 5672 RecordDecl *RD = RT->getDecl(); 5673 5674 std::string InsertionText = std::string(" ") + RD->getKindName(); 5675 5676 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5677 << (unsigned) RD->getTagKind() 5678 << T 5679 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5680 InsertionText); 5681 } else { 5682 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5683 << T 5684 << SourceRange(FriendLoc, TypeRange.getEnd()); 5685 } 5686 } else if (T->getAs<EnumType>()) { 5687 Diag(FriendLoc, diag::ext_enum_friend) 5688 << T 5689 << SourceRange(FriendLoc, TypeRange.getEnd()); 5690 } 5691 } 5692 5693 // C++0x [class.friend]p3: 5694 // If the type specifier in a friend declaration designates a (possibly 5695 // cv-qualified) class type, that class is declared as a friend; otherwise, 5696 // the friend declaration is ignored. 5697 5698 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5699 // in [class.friend]p3 that we do not implement. 5700 5701 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5702} 5703 5704/// Handle a friend type declaration. This works in tandem with 5705/// ActOnTag. 5706/// 5707/// Notes on friend class templates: 5708/// 5709/// We generally treat friend class declarations as if they were 5710/// declaring a class. So, for example, the elaborated type specifier 5711/// in a friend declaration is required to obey the restrictions of a 5712/// class-head (i.e. no typedefs in the scope chain), template 5713/// parameters are required to match up with simple template-ids, &c. 5714/// However, unlike when declaring a template specialization, it's 5715/// okay to refer to a template specialization without an empty 5716/// template parameter declaration, e.g. 5717/// friend class A<T>::B<unsigned>; 5718/// We permit this as a special case; if there are any template 5719/// parameters present at all, require proper matching, i.e. 5720/// template <> template <class T> friend class A<int>::B; 5721Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5722 MultiTemplateParamsArg TempParams) { 5723 SourceLocation Loc = DS.getSourceRange().getBegin(); 5724 5725 assert(DS.isFriendSpecified()); 5726 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5727 5728 // Try to convert the decl specifier to a type. This works for 5729 // friend templates because ActOnTag never produces a ClassTemplateDecl 5730 // for a TUK_Friend. 5731 Declarator TheDeclarator(DS, Declarator::MemberContext); 5732 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 5733 QualType T = TSI->getType(); 5734 if (TheDeclarator.isInvalidType()) 5735 return DeclPtrTy(); 5736 5737 // This is definitely an error in C++98. It's probably meant to 5738 // be forbidden in C++0x, too, but the specification is just 5739 // poorly written. 5740 // 5741 // The problem is with declarations like the following: 5742 // template <T> friend A<T>::foo; 5743 // where deciding whether a class C is a friend or not now hinges 5744 // on whether there exists an instantiation of A that causes 5745 // 'foo' to equal C. There are restrictions on class-heads 5746 // (which we declare (by fiat) elaborated friend declarations to 5747 // be) that makes this tractable. 5748 // 5749 // FIXME: handle "template <> friend class A<T>;", which 5750 // is possibly well-formed? Who even knows? 5751 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5752 Diag(Loc, diag::err_tagless_friend_type_template) 5753 << DS.getSourceRange(); 5754 return DeclPtrTy(); 5755 } 5756 5757 // C++98 [class.friend]p1: A friend of a class is a function 5758 // or class that is not a member of the class . . . 5759 // This is fixed in DR77, which just barely didn't make the C++03 5760 // deadline. It's also a very silly restriction that seriously 5761 // affects inner classes and which nobody else seems to implement; 5762 // thus we never diagnose it, not even in -pedantic. 5763 // 5764 // But note that we could warn about it: it's always useless to 5765 // friend one of your own members (it's not, however, worthless to 5766 // friend a member of an arbitrary specialization of your template). 5767 5768 Decl *D; 5769 if (unsigned NumTempParamLists = TempParams.size()) 5770 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5771 NumTempParamLists, 5772 (TemplateParameterList**) TempParams.release(), 5773 TSI, 5774 DS.getFriendSpecLoc()); 5775 else 5776 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5777 5778 if (!D) 5779 return DeclPtrTy(); 5780 5781 D->setAccess(AS_public); 5782 CurContext->addDecl(D); 5783 5784 return DeclPtrTy::make(D); 5785} 5786 5787Sema::DeclPtrTy 5788Sema::ActOnFriendFunctionDecl(Scope *S, 5789 Declarator &D, 5790 bool IsDefinition, 5791 MultiTemplateParamsArg TemplateParams) { 5792 const DeclSpec &DS = D.getDeclSpec(); 5793 5794 assert(DS.isFriendSpecified()); 5795 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5796 5797 SourceLocation Loc = D.getIdentifierLoc(); 5798 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5799 QualType T = TInfo->getType(); 5800 5801 // C++ [class.friend]p1 5802 // A friend of a class is a function or class.... 5803 // Note that this sees through typedefs, which is intended. 5804 // It *doesn't* see through dependent types, which is correct 5805 // according to [temp.arg.type]p3: 5806 // If a declaration acquires a function type through a 5807 // type dependent on a template-parameter and this causes 5808 // a declaration that does not use the syntactic form of a 5809 // function declarator to have a function type, the program 5810 // is ill-formed. 5811 if (!T->isFunctionType()) { 5812 Diag(Loc, diag::err_unexpected_friend); 5813 5814 // It might be worthwhile to try to recover by creating an 5815 // appropriate declaration. 5816 return DeclPtrTy(); 5817 } 5818 5819 // C++ [namespace.memdef]p3 5820 // - If a friend declaration in a non-local class first declares a 5821 // class or function, the friend class or function is a member 5822 // of the innermost enclosing namespace. 5823 // - The name of the friend is not found by simple name lookup 5824 // until a matching declaration is provided in that namespace 5825 // scope (either before or after the class declaration granting 5826 // friendship). 5827 // - If a friend function is called, its name may be found by the 5828 // name lookup that considers functions from namespaces and 5829 // classes associated with the types of the function arguments. 5830 // - When looking for a prior declaration of a class or a function 5831 // declared as a friend, scopes outside the innermost enclosing 5832 // namespace scope are not considered. 5833 5834 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5835 DeclarationName Name = GetNameForDeclarator(D); 5836 assert(Name); 5837 5838 // The context we found the declaration in, or in which we should 5839 // create the declaration. 5840 DeclContext *DC; 5841 5842 // FIXME: handle local classes 5843 5844 // Recover from invalid scope qualifiers as if they just weren't there. 5845 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5846 ForRedeclaration); 5847 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5848 DC = computeDeclContext(ScopeQual); 5849 5850 // FIXME: handle dependent contexts 5851 if (!DC) return DeclPtrTy(); 5852 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5853 5854 LookupQualifiedName(Previous, DC); 5855 5856 // Ignore things found implicitly in the wrong scope. 5857 // TODO: better diagnostics for this case. Suggesting the right 5858 // qualified scope would be nice... 5859 LookupResult::Filter F = Previous.makeFilter(); 5860 while (F.hasNext()) { 5861 NamedDecl *D = F.next(); 5862 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 5863 F.erase(); 5864 } 5865 F.done(); 5866 5867 if (Previous.empty()) { 5868 D.setInvalidType(); 5869 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5870 return DeclPtrTy(); 5871 } 5872 5873 // C++ [class.friend]p1: A friend of a class is a function or 5874 // class that is not a member of the class . . . 5875 if (DC->Equals(CurContext)) 5876 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5877 5878 // Otherwise walk out to the nearest namespace scope looking for matches. 5879 } else { 5880 // TODO: handle local class contexts. 5881 5882 DC = CurContext; 5883 while (true) { 5884 // Skip class contexts. If someone can cite chapter and verse 5885 // for this behavior, that would be nice --- it's what GCC and 5886 // EDG do, and it seems like a reasonable intent, but the spec 5887 // really only says that checks for unqualified existing 5888 // declarations should stop at the nearest enclosing namespace, 5889 // not that they should only consider the nearest enclosing 5890 // namespace. 5891 while (DC->isRecord()) 5892 DC = DC->getParent(); 5893 5894 LookupQualifiedName(Previous, DC); 5895 5896 // TODO: decide what we think about using declarations. 5897 if (!Previous.empty()) 5898 break; 5899 5900 if (DC->isFileContext()) break; 5901 DC = DC->getParent(); 5902 } 5903 5904 // C++ [class.friend]p1: A friend of a class is a function or 5905 // class that is not a member of the class . . . 5906 // C++0x changes this for both friend types and functions. 5907 // Most C++ 98 compilers do seem to give an error here, so 5908 // we do, too. 5909 if (!Previous.empty() && DC->Equals(CurContext) 5910 && !getLangOptions().CPlusPlus0x) 5911 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5912 } 5913 5914 if (DC->isFileContext()) { 5915 // This implies that it has to be an operator or function. 5916 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5917 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5918 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5919 Diag(Loc, diag::err_introducing_special_friend) << 5920 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5921 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5922 return DeclPtrTy(); 5923 } 5924 } 5925 5926 bool Redeclaration = false; 5927 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5928 move(TemplateParams), 5929 IsDefinition, 5930 Redeclaration); 5931 if (!ND) return DeclPtrTy(); 5932 5933 assert(ND->getDeclContext() == DC); 5934 assert(ND->getLexicalDeclContext() == CurContext); 5935 5936 // Add the function declaration to the appropriate lookup tables, 5937 // adjusting the redeclarations list as necessary. We don't 5938 // want to do this yet if the friending class is dependent. 5939 // 5940 // Also update the scope-based lookup if the target context's 5941 // lookup context is in lexical scope. 5942 if (!CurContext->isDependentContext()) { 5943 DC = DC->getLookupContext(); 5944 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5945 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5946 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5947 } 5948 5949 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5950 D.getIdentifierLoc(), ND, 5951 DS.getFriendSpecLoc()); 5952 FrD->setAccess(AS_public); 5953 CurContext->addDecl(FrD); 5954 5955 return DeclPtrTy::make(ND); 5956} 5957 5958void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5959 AdjustDeclIfTemplate(dcl); 5960 5961 Decl *Dcl = dcl.getAs<Decl>(); 5962 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5963 if (!Fn) { 5964 Diag(DelLoc, diag::err_deleted_non_function); 5965 return; 5966 } 5967 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5968 Diag(DelLoc, diag::err_deleted_decl_not_first); 5969 Diag(Prev->getLocation(), diag::note_previous_declaration); 5970 // If the declaration wasn't the first, we delete the function anyway for 5971 // recovery. 5972 } 5973 Fn->setDeleted(); 5974} 5975 5976static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5977 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5978 ++CI) { 5979 Stmt *SubStmt = *CI; 5980 if (!SubStmt) 5981 continue; 5982 if (isa<ReturnStmt>(SubStmt)) 5983 Self.Diag(SubStmt->getSourceRange().getBegin(), 5984 diag::err_return_in_constructor_handler); 5985 if (!isa<Expr>(SubStmt)) 5986 SearchForReturnInStmt(Self, SubStmt); 5987 } 5988} 5989 5990void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5991 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5992 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5993 SearchForReturnInStmt(*this, Handler); 5994 } 5995} 5996 5997bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5998 const CXXMethodDecl *Old) { 5999 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6000 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6001 6002 if (Context.hasSameType(NewTy, OldTy) || 6003 NewTy->isDependentType() || OldTy->isDependentType()) 6004 return false; 6005 6006 // Check if the return types are covariant 6007 QualType NewClassTy, OldClassTy; 6008 6009 /// Both types must be pointers or references to classes. 6010 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6011 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6012 NewClassTy = NewPT->getPointeeType(); 6013 OldClassTy = OldPT->getPointeeType(); 6014 } 6015 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6016 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6017 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6018 NewClassTy = NewRT->getPointeeType(); 6019 OldClassTy = OldRT->getPointeeType(); 6020 } 6021 } 6022 } 6023 6024 // The return types aren't either both pointers or references to a class type. 6025 if (NewClassTy.isNull()) { 6026 Diag(New->getLocation(), 6027 diag::err_different_return_type_for_overriding_virtual_function) 6028 << New->getDeclName() << NewTy << OldTy; 6029 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6030 6031 return true; 6032 } 6033 6034 // C++ [class.virtual]p6: 6035 // If the return type of D::f differs from the return type of B::f, the 6036 // class type in the return type of D::f shall be complete at the point of 6037 // declaration of D::f or shall be the class type D. 6038 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6039 if (!RT->isBeingDefined() && 6040 RequireCompleteType(New->getLocation(), NewClassTy, 6041 PDiag(diag::err_covariant_return_incomplete) 6042 << New->getDeclName())) 6043 return true; 6044 } 6045 6046 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6047 // Check if the new class derives from the old class. 6048 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6049 Diag(New->getLocation(), 6050 diag::err_covariant_return_not_derived) 6051 << New->getDeclName() << NewTy << OldTy; 6052 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6053 return true; 6054 } 6055 6056 // Check if we the conversion from derived to base is valid. 6057 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6058 diag::err_covariant_return_inaccessible_base, 6059 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6060 // FIXME: Should this point to the return type? 6061 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6062 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6063 return true; 6064 } 6065 } 6066 6067 // The qualifiers of the return types must be the same. 6068 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6069 Diag(New->getLocation(), 6070 diag::err_covariant_return_type_different_qualifications) 6071 << New->getDeclName() << NewTy << OldTy; 6072 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6073 return true; 6074 }; 6075 6076 6077 // The new class type must have the same or less qualifiers as the old type. 6078 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6079 Diag(New->getLocation(), 6080 diag::err_covariant_return_type_class_type_more_qualified) 6081 << New->getDeclName() << NewTy << OldTy; 6082 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6083 return true; 6084 }; 6085 6086 return false; 6087} 6088 6089bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6090 const CXXMethodDecl *Old) 6091{ 6092 if (Old->hasAttr<FinalAttr>()) { 6093 Diag(New->getLocation(), diag::err_final_function_overridden) 6094 << New->getDeclName(); 6095 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6096 return true; 6097 } 6098 6099 return false; 6100} 6101 6102/// \brief Mark the given method pure. 6103/// 6104/// \param Method the method to be marked pure. 6105/// 6106/// \param InitRange the source range that covers the "0" initializer. 6107bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6108 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6109 Method->setPure(); 6110 6111 // A class is abstract if at least one function is pure virtual. 6112 Method->getParent()->setAbstract(true); 6113 return false; 6114 } 6115 6116 if (!Method->isInvalidDecl()) 6117 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6118 << Method->getDeclName() << InitRange; 6119 return true; 6120} 6121 6122/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6123/// an initializer for the out-of-line declaration 'Dcl'. The scope 6124/// is a fresh scope pushed for just this purpose. 6125/// 6126/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6127/// static data member of class X, names should be looked up in the scope of 6128/// class X. 6129void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6130 // If there is no declaration, there was an error parsing it. 6131 Decl *D = Dcl.getAs<Decl>(); 6132 if (D == 0) return; 6133 6134 // We should only get called for declarations with scope specifiers, like: 6135 // int foo::bar; 6136 assert(D->isOutOfLine()); 6137 EnterDeclaratorContext(S, D->getDeclContext()); 6138} 6139 6140/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6141/// initializer for the out-of-line declaration 'Dcl'. 6142void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6143 // If there is no declaration, there was an error parsing it. 6144 Decl *D = Dcl.getAs<Decl>(); 6145 if (D == 0) return; 6146 6147 assert(D->isOutOfLine()); 6148 ExitDeclaratorContext(S); 6149} 6150 6151/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6152/// C++ if/switch/while/for statement. 6153/// e.g: "if (int x = f()) {...}" 6154Action::DeclResult 6155Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6156 // C++ 6.4p2: 6157 // The declarator shall not specify a function or an array. 6158 // The type-specifier-seq shall not contain typedef and shall not declare a 6159 // new class or enumeration. 6160 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6161 "Parser allowed 'typedef' as storage class of condition decl."); 6162 6163 TagDecl *OwnedTag = 0; 6164 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6165 QualType Ty = TInfo->getType(); 6166 6167 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6168 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6169 // would be created and CXXConditionDeclExpr wants a VarDecl. 6170 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6171 << D.getSourceRange(); 6172 return DeclResult(); 6173 } else if (OwnedTag && OwnedTag->isDefinition()) { 6174 // The type-specifier-seq shall not declare a new class or enumeration. 6175 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6176 } 6177 6178 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6179 if (!Dcl) 6180 return DeclResult(); 6181 6182 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6183 VD->setDeclaredInCondition(true); 6184 return Dcl; 6185} 6186 6187void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6188 bool DefinitionRequired) { 6189 // Ignore any vtable uses in unevaluated operands or for classes that do 6190 // not have a vtable. 6191 if (!Class->isDynamicClass() || Class->isDependentContext() || 6192 CurContext->isDependentContext() || 6193 ExprEvalContexts.back().Context == Unevaluated) 6194 return; 6195 6196 // Try to insert this class into the map. 6197 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6198 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6199 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6200 if (!Pos.second) { 6201 // If we already had an entry, check to see if we are promoting this vtable 6202 // to required a definition. If so, we need to reappend to the VTableUses 6203 // list, since we may have already processed the first entry. 6204 if (DefinitionRequired && !Pos.first->second) { 6205 Pos.first->second = true; 6206 } else { 6207 // Otherwise, we can early exit. 6208 return; 6209 } 6210 } 6211 6212 // Local classes need to have their virtual members marked 6213 // immediately. For all other classes, we mark their virtual members 6214 // at the end of the translation unit. 6215 if (Class->isLocalClass()) 6216 MarkVirtualMembersReferenced(Loc, Class); 6217 else 6218 VTableUses.push_back(std::make_pair(Class, Loc)); 6219} 6220 6221bool Sema::DefineUsedVTables() { 6222 // If any dynamic classes have their key function defined within 6223 // this translation unit, then those vtables are considered "used" and must 6224 // be emitted. 6225 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6226 if (const CXXMethodDecl *KeyFunction 6227 = Context.getKeyFunction(DynamicClasses[I])) { 6228 const FunctionDecl *Definition = 0; 6229 if (KeyFunction->getBody(Definition)) 6230 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6231 } 6232 } 6233 6234 if (VTableUses.empty()) 6235 return false; 6236 6237 // Note: The VTableUses vector could grow as a result of marking 6238 // the members of a class as "used", so we check the size each 6239 // time through the loop and prefer indices (with are stable) to 6240 // iterators (which are not). 6241 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6242 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6243 if (!Class) 6244 continue; 6245 6246 SourceLocation Loc = VTableUses[I].second; 6247 6248 // If this class has a key function, but that key function is 6249 // defined in another translation unit, we don't need to emit the 6250 // vtable even though we're using it. 6251 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6252 if (KeyFunction && !KeyFunction->getBody()) { 6253 switch (KeyFunction->getTemplateSpecializationKind()) { 6254 case TSK_Undeclared: 6255 case TSK_ExplicitSpecialization: 6256 case TSK_ExplicitInstantiationDeclaration: 6257 // The key function is in another translation unit. 6258 continue; 6259 6260 case TSK_ExplicitInstantiationDefinition: 6261 case TSK_ImplicitInstantiation: 6262 // We will be instantiating the key function. 6263 break; 6264 } 6265 } else if (!KeyFunction) { 6266 // If we have a class with no key function that is the subject 6267 // of an explicit instantiation declaration, suppress the 6268 // vtable; it will live with the explicit instantiation 6269 // definition. 6270 bool IsExplicitInstantiationDeclaration 6271 = Class->getTemplateSpecializationKind() 6272 == TSK_ExplicitInstantiationDeclaration; 6273 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6274 REnd = Class->redecls_end(); 6275 R != REnd; ++R) { 6276 TemplateSpecializationKind TSK 6277 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6278 if (TSK == TSK_ExplicitInstantiationDeclaration) 6279 IsExplicitInstantiationDeclaration = true; 6280 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6281 IsExplicitInstantiationDeclaration = false; 6282 break; 6283 } 6284 } 6285 6286 if (IsExplicitInstantiationDeclaration) 6287 continue; 6288 } 6289 6290 // Mark all of the virtual members of this class as referenced, so 6291 // that we can build a vtable. Then, tell the AST consumer that a 6292 // vtable for this class is required. 6293 MarkVirtualMembersReferenced(Loc, Class); 6294 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6295 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6296 6297 // Optionally warn if we're emitting a weak vtable. 6298 if (Class->getLinkage() == ExternalLinkage && 6299 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6300 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6301 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6302 } 6303 } 6304 VTableUses.clear(); 6305 6306 return true; 6307} 6308 6309void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6310 const CXXRecordDecl *RD) { 6311 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6312 e = RD->method_end(); i != e; ++i) { 6313 CXXMethodDecl *MD = *i; 6314 6315 // C++ [basic.def.odr]p2: 6316 // [...] A virtual member function is used if it is not pure. [...] 6317 if (MD->isVirtual() && !MD->isPure()) 6318 MarkDeclarationReferenced(Loc, MD); 6319 } 6320 6321 // Only classes that have virtual bases need a VTT. 6322 if (RD->getNumVBases() == 0) 6323 return; 6324 6325 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6326 e = RD->bases_end(); i != e; ++i) { 6327 const CXXRecordDecl *Base = 6328 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6329 if (i->isVirtual()) 6330 continue; 6331 if (Base->getNumVBases() == 0) 6332 continue; 6333 MarkVirtualMembersReferenced(Loc, Base); 6334 } 6335} 6336 6337/// SetIvarInitializers - This routine builds initialization ASTs for the 6338/// Objective-C implementation whose ivars need be initialized. 6339void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6340 if (!getLangOptions().CPlusPlus) 6341 return; 6342 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6343 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6344 CollectIvarsToConstructOrDestruct(OID, ivars); 6345 if (ivars.empty()) 6346 return; 6347 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6348 for (unsigned i = 0; i < ivars.size(); i++) { 6349 FieldDecl *Field = ivars[i]; 6350 if (Field->isInvalidDecl()) 6351 continue; 6352 6353 CXXBaseOrMemberInitializer *Member; 6354 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6355 InitializationKind InitKind = 6356 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6357 6358 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6359 Sema::OwningExprResult MemberInit = 6360 InitSeq.Perform(*this, InitEntity, InitKind, 6361 Sema::MultiExprArg(*this, 0, 0)); 6362 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6363 // Note, MemberInit could actually come back empty if no initialization 6364 // is required (e.g., because it would call a trivial default constructor) 6365 if (!MemberInit.get() || MemberInit.isInvalid()) 6366 continue; 6367 6368 Member = 6369 new (Context) CXXBaseOrMemberInitializer(Context, 6370 Field, SourceLocation(), 6371 SourceLocation(), 6372 MemberInit.takeAs<Expr>(), 6373 SourceLocation()); 6374 AllToInit.push_back(Member); 6375 6376 // Be sure that the destructor is accessible and is marked as referenced. 6377 if (const RecordType *RecordTy 6378 = Context.getBaseElementType(Field->getType()) 6379 ->getAs<RecordType>()) { 6380 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6381 if (CXXDestructorDecl *Destructor 6382 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6383 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6384 CheckDestructorAccess(Field->getLocation(), Destructor, 6385 PDiag(diag::err_access_dtor_ivar) 6386 << Context.getBaseElementType(Field->getType())); 6387 } 6388 } 6389 } 6390 ObjCImplementation->setIvarInitializers(Context, 6391 AllToInit.data(), AllToInit.size()); 6392 } 6393} 6394