SemaDeclCXX.cpp revision 6cdc161527a513f28dfc6f6ec27eb287f8268024
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() == RecordDecl::TK_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 // FIXME: Allocate via ASTContext? 508 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 509 Class->getTagKind() == RecordDecl::TK_class, 510 Access, BaseType); 511} 512 513void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 514 const CXXRecordDecl *BaseClass, 515 bool BaseIsVirtual) { 516 // A class with a non-empty base class is not empty. 517 // FIXME: Standard ref? 518 if (!BaseClass->isEmpty()) 519 Class->setEmpty(false); 520 521 // C++ [class.virtual]p1: 522 // A class that [...] inherits a virtual function is called a polymorphic 523 // class. 524 if (BaseClass->isPolymorphic()) 525 Class->setPolymorphic(true); 526 527 // C++ [dcl.init.aggr]p1: 528 // An aggregate is [...] a class with [...] no base classes [...]. 529 Class->setAggregate(false); 530 531 // C++ [class]p4: 532 // A POD-struct is an aggregate class... 533 Class->setPOD(false); 534 535 if (BaseIsVirtual) { 536 // C++ [class.ctor]p5: 537 // A constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialConstructor(false); 539 540 // C++ [class.copy]p6: 541 // A copy constructor is trivial if its class has no virtual base classes. 542 Class->setHasTrivialCopyConstructor(false); 543 544 // C++ [class.copy]p11: 545 // A copy assignment operator is trivial if its class has no virtual 546 // base classes. 547 Class->setHasTrivialCopyAssignment(false); 548 549 // C++0x [meta.unary.prop] is_empty: 550 // T is a class type, but not a union type, with ... no virtual base 551 // classes 552 Class->setEmpty(false); 553 } else { 554 // C++ [class.ctor]p5: 555 // A constructor is trivial if all the direct base classes of its 556 // class have trivial constructors. 557 if (!BaseClass->hasTrivialConstructor()) 558 Class->setHasTrivialConstructor(false); 559 560 // C++ [class.copy]p6: 561 // A copy constructor is trivial if all the direct base classes of its 562 // class have trivial copy constructors. 563 if (!BaseClass->hasTrivialCopyConstructor()) 564 Class->setHasTrivialCopyConstructor(false); 565 566 // C++ [class.copy]p11: 567 // A copy assignment operator is trivial if all the direct base classes 568 // of its class have trivial copy assignment operators. 569 if (!BaseClass->hasTrivialCopyAssignment()) 570 Class->setHasTrivialCopyAssignment(false); 571 } 572 573 // C++ [class.ctor]p3: 574 // A destructor is trivial if all the direct base classes of its class 575 // have trivial destructors. 576 if (!BaseClass->hasTrivialDestructor()) 577 Class->setHasTrivialDestructor(false); 578} 579 580/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 581/// one entry in the base class list of a class specifier, for 582/// example: 583/// class foo : public bar, virtual private baz { 584/// 'public bar' and 'virtual private baz' are each base-specifiers. 585Sema::BaseResult 586Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 587 bool Virtual, AccessSpecifier Access, 588 TypeTy *basetype, SourceLocation BaseLoc) { 589 if (!classdecl) 590 return true; 591 592 AdjustDeclIfTemplate(classdecl); 593 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 594 if (!Class) 595 return true; 596 597 QualType BaseType = GetTypeFromParser(basetype); 598 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 599 Virtual, Access, 600 BaseType, BaseLoc)) 601 return BaseSpec; 602 603 return true; 604} 605 606/// \brief Performs the actual work of attaching the given base class 607/// specifiers to a C++ class. 608bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 609 unsigned NumBases) { 610 if (NumBases == 0) 611 return false; 612 613 // Used to keep track of which base types we have already seen, so 614 // that we can properly diagnose redundant direct base types. Note 615 // that the key is always the unqualified canonical type of the base 616 // class. 617 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 618 619 // Copy non-redundant base specifiers into permanent storage. 620 unsigned NumGoodBases = 0; 621 bool Invalid = false; 622 for (unsigned idx = 0; idx < NumBases; ++idx) { 623 QualType NewBaseType 624 = Context.getCanonicalType(Bases[idx]->getType()); 625 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 626 627 if (KnownBaseTypes[NewBaseType]) { 628 // C++ [class.mi]p3: 629 // A class shall not be specified as a direct base class of a 630 // derived class more than once. 631 Diag(Bases[idx]->getSourceRange().getBegin(), 632 diag::err_duplicate_base_class) 633 << KnownBaseTypes[NewBaseType]->getType() 634 << Bases[idx]->getSourceRange(); 635 636 // Delete the duplicate base class specifier; we're going to 637 // overwrite its pointer later. 638 Context.Deallocate(Bases[idx]); 639 640 Invalid = true; 641 } else { 642 // Okay, add this new base class. 643 KnownBaseTypes[NewBaseType] = Bases[idx]; 644 Bases[NumGoodBases++] = Bases[idx]; 645 } 646 } 647 648 // Attach the remaining base class specifiers to the derived class. 649 Class->setBases(Bases, NumGoodBases); 650 651 // Delete the remaining (good) base class specifiers, since their 652 // data has been copied into the CXXRecordDecl. 653 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 654 Context.Deallocate(Bases[idx]); 655 656 return Invalid; 657} 658 659/// ActOnBaseSpecifiers - Attach the given base specifiers to the 660/// class, after checking whether there are any duplicate base 661/// classes. 662void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 663 unsigned NumBases) { 664 if (!ClassDecl || !Bases || !NumBases) 665 return; 666 667 AdjustDeclIfTemplate(ClassDecl); 668 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 669 (CXXBaseSpecifier**)(Bases), NumBases); 670} 671 672static CXXRecordDecl *GetClassForType(QualType T) { 673 if (const RecordType *RT = T->getAs<RecordType>()) 674 return cast<CXXRecordDecl>(RT->getDecl()); 675 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 676 return ICT->getDecl(); 677 else 678 return 0; 679} 680 681/// \brief Determine whether the type \p Derived is a C++ class that is 682/// derived from the type \p Base. 683bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 684 if (!getLangOptions().CPlusPlus) 685 return false; 686 687 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 688 if (!DerivedRD) 689 return false; 690 691 CXXRecordDecl *BaseRD = GetClassForType(Base); 692 if (!BaseRD) 693 return false; 694 695 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 696 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 697} 698 699/// \brief Determine whether the type \p Derived is a C++ class that is 700/// derived from the type \p Base. 701bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 702 if (!getLangOptions().CPlusPlus) 703 return false; 704 705 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 706 if (!DerivedRD) 707 return false; 708 709 CXXRecordDecl *BaseRD = GetClassForType(Base); 710 if (!BaseRD) 711 return false; 712 713 return DerivedRD->isDerivedFrom(BaseRD, Paths); 714} 715 716void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 717 CXXBaseSpecifierArray &BasePathArray) { 718 assert(BasePathArray.empty() && "Base path array must be empty!"); 719 assert(Paths.isRecordingPaths() && "Must record paths!"); 720 721 const CXXBasePath &Path = Paths.front(); 722 723 // We first go backward and check if we have a virtual base. 724 // FIXME: It would be better if CXXBasePath had the base specifier for 725 // the nearest virtual base. 726 unsigned Start = 0; 727 for (unsigned I = Path.size(); I != 0; --I) { 728 if (Path[I - 1].Base->isVirtual()) { 729 Start = I - 1; 730 break; 731 } 732 } 733 734 // Now add all bases. 735 for (unsigned I = Start, E = Path.size(); I != E; ++I) 736 BasePathArray.push_back(Path[I].Base); 737} 738 739/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 740/// conversion (where Derived and Base are class types) is 741/// well-formed, meaning that the conversion is unambiguous (and 742/// that all of the base classes are accessible). Returns true 743/// and emits a diagnostic if the code is ill-formed, returns false 744/// otherwise. Loc is the location where this routine should point to 745/// if there is an error, and Range is the source range to highlight 746/// if there is an error. 747bool 748Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 749 unsigned InaccessibleBaseID, 750 unsigned AmbigiousBaseConvID, 751 SourceLocation Loc, SourceRange Range, 752 DeclarationName Name, 753 CXXBaseSpecifierArray *BasePath) { 754 // First, determine whether the path from Derived to Base is 755 // ambiguous. This is slightly more expensive than checking whether 756 // the Derived to Base conversion exists, because here we need to 757 // explore multiple paths to determine if there is an ambiguity. 758 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 759 /*DetectVirtual=*/false); 760 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(DerivationOkay && 762 "Can only be used with a derived-to-base conversion"); 763 (void)DerivationOkay; 764 765 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 766 if (InaccessibleBaseID) { 767 // Check that the base class can be accessed. 768 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 769 InaccessibleBaseID)) { 770 case AR_inaccessible: 771 return true; 772 case AR_accessible: 773 case AR_dependent: 774 case AR_delayed: 775 break; 776 } 777 } 778 779 // Build a base path if necessary. 780 if (BasePath) 781 BuildBasePathArray(Paths, *BasePath); 782 return false; 783 } 784 785 // We know that the derived-to-base conversion is ambiguous, and 786 // we're going to produce a diagnostic. Perform the derived-to-base 787 // search just one more time to compute all of the possible paths so 788 // that we can print them out. This is more expensive than any of 789 // the previous derived-to-base checks we've done, but at this point 790 // performance isn't as much of an issue. 791 Paths.clear(); 792 Paths.setRecordingPaths(true); 793 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 794 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 795 (void)StillOkay; 796 797 // Build up a textual representation of the ambiguous paths, e.g., 798 // D -> B -> A, that will be used to illustrate the ambiguous 799 // conversions in the diagnostic. We only print one of the paths 800 // to each base class subobject. 801 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 802 803 Diag(Loc, AmbigiousBaseConvID) 804 << Derived << Base << PathDisplayStr << Range << Name; 805 return true; 806} 807 808bool 809Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 810 SourceLocation Loc, SourceRange Range, 811 CXXBaseSpecifierArray *BasePath, 812 bool IgnoreAccess) { 813 return CheckDerivedToBaseConversion(Derived, Base, 814 IgnoreAccess ? 0 815 : diag::err_upcast_to_inaccessible_base, 816 diag::err_ambiguous_derived_to_base_conv, 817 Loc, Range, DeclarationName(), 818 BasePath); 819} 820 821 822/// @brief Builds a string representing ambiguous paths from a 823/// specific derived class to different subobjects of the same base 824/// class. 825/// 826/// This function builds a string that can be used in error messages 827/// to show the different paths that one can take through the 828/// inheritance hierarchy to go from the derived class to different 829/// subobjects of a base class. The result looks something like this: 830/// @code 831/// struct D -> struct B -> struct A 832/// struct D -> struct C -> struct A 833/// @endcode 834std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 835 std::string PathDisplayStr; 836 std::set<unsigned> DisplayedPaths; 837 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 838 Path != Paths.end(); ++Path) { 839 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 840 // We haven't displayed a path to this particular base 841 // class subobject yet. 842 PathDisplayStr += "\n "; 843 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 844 for (CXXBasePath::const_iterator Element = Path->begin(); 845 Element != Path->end(); ++Element) 846 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 847 } 848 } 849 850 return PathDisplayStr; 851} 852 853//===----------------------------------------------------------------------===// 854// C++ class member Handling 855//===----------------------------------------------------------------------===// 856 857/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 858/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 859/// bitfield width if there is one and 'InitExpr' specifies the initializer if 860/// any. 861Sema::DeclPtrTy 862Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 863 MultiTemplateParamsArg TemplateParameterLists, 864 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 865 bool Deleted) { 866 const DeclSpec &DS = D.getDeclSpec(); 867 DeclarationName Name = GetNameForDeclarator(D); 868 Expr *BitWidth = static_cast<Expr*>(BW); 869 Expr *Init = static_cast<Expr*>(InitExpr); 870 SourceLocation Loc = D.getIdentifierLoc(); 871 872 bool isFunc = D.isFunctionDeclarator(); 873 874 assert(!DS.isFriendSpecified()); 875 876 // C++ 9.2p6: A member shall not be declared to have automatic storage 877 // duration (auto, register) or with the extern storage-class-specifier. 878 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 879 // data members and cannot be applied to names declared const or static, 880 // and cannot be applied to reference members. 881 switch (DS.getStorageClassSpec()) { 882 case DeclSpec::SCS_unspecified: 883 case DeclSpec::SCS_typedef: 884 case DeclSpec::SCS_static: 885 // FALL THROUGH. 886 break; 887 case DeclSpec::SCS_mutable: 888 if (isFunc) { 889 if (DS.getStorageClassSpecLoc().isValid()) 890 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 891 else 892 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 893 894 // FIXME: It would be nicer if the keyword was ignored only for this 895 // declarator. Otherwise we could get follow-up errors. 896 D.getMutableDeclSpec().ClearStorageClassSpecs(); 897 } else { 898 QualType T = GetTypeForDeclarator(D, S); 899 diag::kind err = static_cast<diag::kind>(0); 900 if (T->isReferenceType()) 901 err = diag::err_mutable_reference; 902 else if (T.isConstQualified()) 903 err = diag::err_mutable_const; 904 if (err != 0) { 905 if (DS.getStorageClassSpecLoc().isValid()) 906 Diag(DS.getStorageClassSpecLoc(), err); 907 else 908 Diag(DS.getThreadSpecLoc(), err); 909 // FIXME: It would be nicer if the keyword was ignored only for this 910 // declarator. Otherwise we could get follow-up errors. 911 D.getMutableDeclSpec().ClearStorageClassSpecs(); 912 } 913 } 914 break; 915 default: 916 if (DS.getStorageClassSpecLoc().isValid()) 917 Diag(DS.getStorageClassSpecLoc(), 918 diag::err_storageclass_invalid_for_member); 919 else 920 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 921 D.getMutableDeclSpec().ClearStorageClassSpecs(); 922 } 923 924 if (!isFunc && 925 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 926 D.getNumTypeObjects() == 0) { 927 // Check also for this case: 928 // 929 // typedef int f(); 930 // f a; 931 // 932 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 933 isFunc = TDType->isFunctionType(); 934 } 935 936 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 937 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 938 !isFunc); 939 940 Decl *Member; 941 if (isInstField) { 942 // FIXME: Check for template parameters! 943 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 944 AS); 945 assert(Member && "HandleField never returns null"); 946 } else { 947 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 948 .getAs<Decl>(); 949 if (!Member) { 950 if (BitWidth) DeleteExpr(BitWidth); 951 return DeclPtrTy(); 952 } 953 954 // Non-instance-fields can't have a bitfield. 955 if (BitWidth) { 956 if (Member->isInvalidDecl()) { 957 // don't emit another diagnostic. 958 } else if (isa<VarDecl>(Member)) { 959 // C++ 9.6p3: A bit-field shall not be a static member. 960 // "static member 'A' cannot be a bit-field" 961 Diag(Loc, diag::err_static_not_bitfield) 962 << Name << BitWidth->getSourceRange(); 963 } else if (isa<TypedefDecl>(Member)) { 964 // "typedef member 'x' cannot be a bit-field" 965 Diag(Loc, diag::err_typedef_not_bitfield) 966 << Name << BitWidth->getSourceRange(); 967 } else { 968 // A function typedef ("typedef int f(); f a;"). 969 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 970 Diag(Loc, diag::err_not_integral_type_bitfield) 971 << Name << cast<ValueDecl>(Member)->getType() 972 << BitWidth->getSourceRange(); 973 } 974 975 DeleteExpr(BitWidth); 976 BitWidth = 0; 977 Member->setInvalidDecl(); 978 } 979 980 Member->setAccess(AS); 981 982 // If we have declared a member function template, set the access of the 983 // templated declaration as well. 984 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 985 FunTmpl->getTemplatedDecl()->setAccess(AS); 986 } 987 988 assert((Name || isInstField) && "No identifier for non-field ?"); 989 990 if (Init) 991 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 992 if (Deleted) // FIXME: Source location is not very good. 993 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 994 995 if (isInstField) { 996 FieldCollector->Add(cast<FieldDecl>(Member)); 997 return DeclPtrTy(); 998 } 999 return DeclPtrTy::make(Member); 1000} 1001 1002/// \brief Find the direct and/or virtual base specifiers that 1003/// correspond to the given base type, for use in base initialization 1004/// within a constructor. 1005static bool FindBaseInitializer(Sema &SemaRef, 1006 CXXRecordDecl *ClassDecl, 1007 QualType BaseType, 1008 const CXXBaseSpecifier *&DirectBaseSpec, 1009 const CXXBaseSpecifier *&VirtualBaseSpec) { 1010 // First, check for a direct base class. 1011 DirectBaseSpec = 0; 1012 for (CXXRecordDecl::base_class_const_iterator Base 1013 = ClassDecl->bases_begin(); 1014 Base != ClassDecl->bases_end(); ++Base) { 1015 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1016 // We found a direct base of this type. That's what we're 1017 // initializing. 1018 DirectBaseSpec = &*Base; 1019 break; 1020 } 1021 } 1022 1023 // Check for a virtual base class. 1024 // FIXME: We might be able to short-circuit this if we know in advance that 1025 // there are no virtual bases. 1026 VirtualBaseSpec = 0; 1027 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1028 // We haven't found a base yet; search the class hierarchy for a 1029 // virtual base class. 1030 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1031 /*DetectVirtual=*/false); 1032 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1033 BaseType, Paths)) { 1034 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1035 Path != Paths.end(); ++Path) { 1036 if (Path->back().Base->isVirtual()) { 1037 VirtualBaseSpec = Path->back().Base; 1038 break; 1039 } 1040 } 1041 } 1042 } 1043 1044 return DirectBaseSpec || VirtualBaseSpec; 1045} 1046 1047/// ActOnMemInitializer - Handle a C++ member initializer. 1048Sema::MemInitResult 1049Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1050 Scope *S, 1051 CXXScopeSpec &SS, 1052 IdentifierInfo *MemberOrBase, 1053 TypeTy *TemplateTypeTy, 1054 SourceLocation IdLoc, 1055 SourceLocation LParenLoc, 1056 ExprTy **Args, unsigned NumArgs, 1057 SourceLocation *CommaLocs, 1058 SourceLocation RParenLoc) { 1059 if (!ConstructorD) 1060 return true; 1061 1062 AdjustDeclIfTemplate(ConstructorD); 1063 1064 CXXConstructorDecl *Constructor 1065 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1066 if (!Constructor) { 1067 // The user wrote a constructor initializer on a function that is 1068 // not a C++ constructor. Ignore the error for now, because we may 1069 // have more member initializers coming; we'll diagnose it just 1070 // once in ActOnMemInitializers. 1071 return true; 1072 } 1073 1074 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1075 1076 // C++ [class.base.init]p2: 1077 // Names in a mem-initializer-id are looked up in the scope of the 1078 // constructor’s class and, if not found in that scope, are looked 1079 // up in the scope containing the constructor’s 1080 // definition. [Note: if the constructor’s class contains a member 1081 // with the same name as a direct or virtual base class of the 1082 // class, a mem-initializer-id naming the member or base class and 1083 // composed of a single identifier refers to the class member. A 1084 // mem-initializer-id for the hidden base class may be specified 1085 // using a qualified name. ] 1086 if (!SS.getScopeRep() && !TemplateTypeTy) { 1087 // Look for a member, first. 1088 FieldDecl *Member = 0; 1089 DeclContext::lookup_result Result 1090 = ClassDecl->lookup(MemberOrBase); 1091 if (Result.first != Result.second) 1092 Member = dyn_cast<FieldDecl>(*Result.first); 1093 1094 // FIXME: Handle members of an anonymous union. 1095 1096 if (Member) 1097 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1098 LParenLoc, RParenLoc); 1099 } 1100 // It didn't name a member, so see if it names a class. 1101 QualType BaseType; 1102 TypeSourceInfo *TInfo = 0; 1103 1104 if (TemplateTypeTy) { 1105 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1106 } else { 1107 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1108 LookupParsedName(R, S, &SS); 1109 1110 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1111 if (!TyD) { 1112 if (R.isAmbiguous()) return true; 1113 1114 // We don't want access-control diagnostics here. 1115 R.suppressDiagnostics(); 1116 1117 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1118 bool NotUnknownSpecialization = false; 1119 DeclContext *DC = computeDeclContext(SS, false); 1120 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1121 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1122 1123 if (!NotUnknownSpecialization) { 1124 // When the scope specifier can refer to a member of an unknown 1125 // specialization, we take it as a type name. 1126 BaseType = CheckTypenameType(ETK_None, 1127 (NestedNameSpecifier *)SS.getScopeRep(), 1128 *MemberOrBase, SS.getRange()); 1129 if (BaseType.isNull()) 1130 return true; 1131 1132 R.clear(); 1133 } 1134 } 1135 1136 // If no results were found, try to correct typos. 1137 if (R.empty() && BaseType.isNull() && 1138 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1139 R.isSingleResult()) { 1140 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1141 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1142 // We have found a non-static data member with a similar 1143 // name to what was typed; complain and initialize that 1144 // member. 1145 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1146 << MemberOrBase << true << R.getLookupName() 1147 << FixItHint::CreateReplacement(R.getNameLoc(), 1148 R.getLookupName().getAsString()); 1149 Diag(Member->getLocation(), diag::note_previous_decl) 1150 << Member->getDeclName(); 1151 1152 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1153 LParenLoc, RParenLoc); 1154 } 1155 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1156 const CXXBaseSpecifier *DirectBaseSpec; 1157 const CXXBaseSpecifier *VirtualBaseSpec; 1158 if (FindBaseInitializer(*this, ClassDecl, 1159 Context.getTypeDeclType(Type), 1160 DirectBaseSpec, VirtualBaseSpec)) { 1161 // We have found a direct or virtual base class with a 1162 // similar name to what was typed; complain and initialize 1163 // that base class. 1164 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1165 << MemberOrBase << false << R.getLookupName() 1166 << FixItHint::CreateReplacement(R.getNameLoc(), 1167 R.getLookupName().getAsString()); 1168 1169 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1170 : VirtualBaseSpec; 1171 Diag(BaseSpec->getSourceRange().getBegin(), 1172 diag::note_base_class_specified_here) 1173 << BaseSpec->getType() 1174 << BaseSpec->getSourceRange(); 1175 1176 TyD = Type; 1177 } 1178 } 1179 } 1180 1181 if (!TyD && BaseType.isNull()) { 1182 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1183 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1184 return true; 1185 } 1186 } 1187 1188 if (BaseType.isNull()) { 1189 BaseType = Context.getTypeDeclType(TyD); 1190 if (SS.isSet()) { 1191 NestedNameSpecifier *Qualifier = 1192 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1193 1194 // FIXME: preserve source range information 1195 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1196 } 1197 } 1198 } 1199 1200 if (!TInfo) 1201 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1202 1203 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1204 LParenLoc, RParenLoc, ClassDecl); 1205} 1206 1207/// Checks an initializer expression for use of uninitialized fields, such as 1208/// containing the field that is being initialized. Returns true if there is an 1209/// uninitialized field was used an updates the SourceLocation parameter; false 1210/// otherwise. 1211static bool InitExprContainsUninitializedFields(const Stmt* S, 1212 const FieldDecl* LhsField, 1213 SourceLocation* L) { 1214 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1215 if (ME) { 1216 const NamedDecl* RhsField = ME->getMemberDecl(); 1217 if (RhsField == LhsField) { 1218 // Initializing a field with itself. Throw a warning. 1219 // But wait; there are exceptions! 1220 // Exception #1: The field may not belong to this record. 1221 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1222 const Expr* base = ME->getBase(); 1223 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1224 // Even though the field matches, it does not belong to this record. 1225 return false; 1226 } 1227 // None of the exceptions triggered; return true to indicate an 1228 // uninitialized field was used. 1229 *L = ME->getMemberLoc(); 1230 return true; 1231 } 1232 } 1233 bool found = false; 1234 for (Stmt::const_child_iterator it = S->child_begin(); 1235 it != S->child_end() && found == false; 1236 ++it) { 1237 if (isa<CallExpr>(S)) { 1238 // Do not descend into function calls or constructors, as the use 1239 // of an uninitialized field may be valid. One would have to inspect 1240 // the contents of the function/ctor to determine if it is safe or not. 1241 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1242 // may be safe, depending on what the function/ctor does. 1243 continue; 1244 } 1245 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1246 } 1247 return found; 1248} 1249 1250Sema::MemInitResult 1251Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1252 unsigned NumArgs, SourceLocation IdLoc, 1253 SourceLocation LParenLoc, 1254 SourceLocation RParenLoc) { 1255 // Diagnose value-uses of fields to initialize themselves, e.g. 1256 // foo(foo) 1257 // where foo is not also a parameter to the constructor. 1258 // TODO: implement -Wuninitialized and fold this into that framework. 1259 for (unsigned i = 0; i < NumArgs; ++i) { 1260 SourceLocation L; 1261 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1262 // FIXME: Return true in the case when other fields are used before being 1263 // uninitialized. For example, let this field be the i'th field. When 1264 // initializing the i'th field, throw a warning if any of the >= i'th 1265 // fields are used, as they are not yet initialized. 1266 // Right now we are only handling the case where the i'th field uses 1267 // itself in its initializer. 1268 Diag(L, diag::warn_field_is_uninit); 1269 } 1270 } 1271 1272 bool HasDependentArg = false; 1273 for (unsigned i = 0; i < NumArgs; i++) 1274 HasDependentArg |= Args[i]->isTypeDependent(); 1275 1276 QualType FieldType = Member->getType(); 1277 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1278 FieldType = Array->getElementType(); 1279 if (FieldType->isDependentType() || HasDependentArg) { 1280 // Can't check initialization for a member of dependent type or when 1281 // any of the arguments are type-dependent expressions. 1282 OwningExprResult Init 1283 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1284 RParenLoc)); 1285 1286 // Erase any temporaries within this evaluation context; we're not 1287 // going to track them in the AST, since we'll be rebuilding the 1288 // ASTs during template instantiation. 1289 ExprTemporaries.erase( 1290 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1291 ExprTemporaries.end()); 1292 1293 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1294 LParenLoc, 1295 Init.takeAs<Expr>(), 1296 RParenLoc); 1297 1298 } 1299 1300 if (Member->isInvalidDecl()) 1301 return true; 1302 1303 // Initialize the member. 1304 InitializedEntity MemberEntity = 1305 InitializedEntity::InitializeMember(Member, 0); 1306 InitializationKind Kind = 1307 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1308 1309 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1310 1311 OwningExprResult MemberInit = 1312 InitSeq.Perform(*this, MemberEntity, Kind, 1313 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1314 if (MemberInit.isInvalid()) 1315 return true; 1316 1317 // C++0x [class.base.init]p7: 1318 // The initialization of each base and member constitutes a 1319 // full-expression. 1320 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1321 if (MemberInit.isInvalid()) 1322 return true; 1323 1324 // If we are in a dependent context, template instantiation will 1325 // perform this type-checking again. Just save the arguments that we 1326 // received in a ParenListExpr. 1327 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1328 // of the information that we have about the member 1329 // initializer. However, deconstructing the ASTs is a dicey process, 1330 // and this approach is far more likely to get the corner cases right. 1331 if (CurContext->isDependentContext()) { 1332 // Bump the reference count of all of the arguments. 1333 for (unsigned I = 0; I != NumArgs; ++I) 1334 Args[I]->Retain(); 1335 1336 OwningExprResult Init 1337 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1338 RParenLoc)); 1339 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1340 LParenLoc, 1341 Init.takeAs<Expr>(), 1342 RParenLoc); 1343 } 1344 1345 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1346 LParenLoc, 1347 MemberInit.takeAs<Expr>(), 1348 RParenLoc); 1349} 1350 1351Sema::MemInitResult 1352Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1353 Expr **Args, unsigned NumArgs, 1354 SourceLocation LParenLoc, SourceLocation RParenLoc, 1355 CXXRecordDecl *ClassDecl) { 1356 bool HasDependentArg = false; 1357 for (unsigned i = 0; i < NumArgs; i++) 1358 HasDependentArg |= Args[i]->isTypeDependent(); 1359 1360 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1361 if (BaseType->isDependentType() || HasDependentArg) { 1362 // Can't check initialization for a base of dependent type or when 1363 // any of the arguments are type-dependent expressions. 1364 OwningExprResult BaseInit 1365 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1366 RParenLoc)); 1367 1368 // Erase any temporaries within this evaluation context; we're not 1369 // going to track them in the AST, since we'll be rebuilding the 1370 // ASTs during template instantiation. 1371 ExprTemporaries.erase( 1372 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1373 ExprTemporaries.end()); 1374 1375 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1376 /*IsVirtual=*/false, 1377 LParenLoc, 1378 BaseInit.takeAs<Expr>(), 1379 RParenLoc); 1380 } 1381 1382 if (!BaseType->isRecordType()) 1383 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1384 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1385 1386 // C++ [class.base.init]p2: 1387 // [...] Unless the mem-initializer-id names a nonstatic data 1388 // member of the constructor’s class or a direct or virtual base 1389 // of that class, the mem-initializer is ill-formed. A 1390 // mem-initializer-list can initialize a base class using any 1391 // name that denotes that base class type. 1392 1393 // Check for direct and virtual base classes. 1394 const CXXBaseSpecifier *DirectBaseSpec = 0; 1395 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1396 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1397 VirtualBaseSpec); 1398 1399 // C++ [base.class.init]p2: 1400 // If a mem-initializer-id is ambiguous because it designates both 1401 // a direct non-virtual base class and an inherited virtual base 1402 // class, the mem-initializer is ill-formed. 1403 if (DirectBaseSpec && VirtualBaseSpec) 1404 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1405 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1406 // C++ [base.class.init]p2: 1407 // Unless the mem-initializer-id names a nonstatic data membeer of the 1408 // constructor's class ot a direst or virtual base of that class, the 1409 // mem-initializer is ill-formed. 1410 if (!DirectBaseSpec && !VirtualBaseSpec) 1411 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1412 << BaseType << Context.getTypeDeclType(ClassDecl) 1413 << BaseTInfo->getTypeLoc().getSourceRange(); 1414 1415 CXXBaseSpecifier *BaseSpec 1416 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1417 if (!BaseSpec) 1418 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1419 1420 // Initialize the base. 1421 InitializedEntity BaseEntity = 1422 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1423 InitializationKind Kind = 1424 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1425 1426 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1427 1428 OwningExprResult BaseInit = 1429 InitSeq.Perform(*this, BaseEntity, Kind, 1430 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1431 if (BaseInit.isInvalid()) 1432 return true; 1433 1434 // C++0x [class.base.init]p7: 1435 // The initialization of each base and member constitutes a 1436 // full-expression. 1437 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1438 if (BaseInit.isInvalid()) 1439 return true; 1440 1441 // If we are in a dependent context, template instantiation will 1442 // perform this type-checking again. Just save the arguments that we 1443 // received in a ParenListExpr. 1444 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1445 // of the information that we have about the base 1446 // initializer. However, deconstructing the ASTs is a dicey process, 1447 // and this approach is far more likely to get the corner cases right. 1448 if (CurContext->isDependentContext()) { 1449 // Bump the reference count of all of the arguments. 1450 for (unsigned I = 0; I != NumArgs; ++I) 1451 Args[I]->Retain(); 1452 1453 OwningExprResult Init 1454 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1455 RParenLoc)); 1456 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1457 BaseSpec->isVirtual(), 1458 LParenLoc, 1459 Init.takeAs<Expr>(), 1460 RParenLoc); 1461 } 1462 1463 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1464 BaseSpec->isVirtual(), 1465 LParenLoc, 1466 BaseInit.takeAs<Expr>(), 1467 RParenLoc); 1468} 1469 1470/// ImplicitInitializerKind - How an implicit base or member initializer should 1471/// initialize its base or member. 1472enum ImplicitInitializerKind { 1473 IIK_Default, 1474 IIK_Copy, 1475 IIK_Move 1476}; 1477 1478static bool 1479BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1480 ImplicitInitializerKind ImplicitInitKind, 1481 CXXBaseSpecifier *BaseSpec, 1482 bool IsInheritedVirtualBase, 1483 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1484 InitializedEntity InitEntity 1485 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1486 IsInheritedVirtualBase); 1487 1488 Sema::OwningExprResult BaseInit(SemaRef); 1489 1490 switch (ImplicitInitKind) { 1491 case IIK_Default: { 1492 InitializationKind InitKind 1493 = InitializationKind::CreateDefault(Constructor->getLocation()); 1494 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1495 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1496 Sema::MultiExprArg(SemaRef, 0, 0)); 1497 break; 1498 } 1499 1500 case IIK_Copy: { 1501 ParmVarDecl *Param = Constructor->getParamDecl(0); 1502 QualType ParamType = Param->getType().getNonReferenceType(); 1503 1504 Expr *CopyCtorArg = 1505 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1506 Constructor->getLocation(), ParamType, 0); 1507 1508 // Cast to the base class to avoid ambiguities. 1509 QualType ArgTy = 1510 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1511 ParamType.getQualifiers()); 1512 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1513 CastExpr::CK_UncheckedDerivedToBase, 1514 /*isLvalue=*/true, 1515 CXXBaseSpecifierArray(BaseSpec)); 1516 1517 InitializationKind InitKind 1518 = InitializationKind::CreateDirect(Constructor->getLocation(), 1519 SourceLocation(), SourceLocation()); 1520 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1521 &CopyCtorArg, 1); 1522 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1523 Sema::MultiExprArg(SemaRef, 1524 (void**)&CopyCtorArg, 1)); 1525 break; 1526 } 1527 1528 case IIK_Move: 1529 assert(false && "Unhandled initializer kind!"); 1530 } 1531 1532 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1533 if (BaseInit.isInvalid()) 1534 return true; 1535 1536 CXXBaseInit = 1537 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1538 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1539 SourceLocation()), 1540 BaseSpec->isVirtual(), 1541 SourceLocation(), 1542 BaseInit.takeAs<Expr>(), 1543 SourceLocation()); 1544 1545 return false; 1546} 1547 1548static bool 1549BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1550 ImplicitInitializerKind ImplicitInitKind, 1551 FieldDecl *Field, 1552 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1553 if (ImplicitInitKind == IIK_Copy) { 1554 // FIXME: We should not return early here, but will do so until 1555 // we know how to handle copy initialization of arrays. 1556 CXXMemberInit = 0; 1557 return false; 1558 1559 ParmVarDecl *Param = Constructor->getParamDecl(0); 1560 QualType ParamType = Param->getType().getNonReferenceType(); 1561 1562 Expr *MemberExprBase = 1563 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1564 SourceLocation(), ParamType, 0); 1565 1566 1567 Expr *CopyCtorArg = 1568 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1569 0, SourceRange(), Field, 1570 DeclAccessPair::make(Field, Field->getAccess()), 1571 SourceLocation(), 0, 1572 Field->getType().getNonReferenceType()); 1573 1574 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1575 InitializationKind InitKind = 1576 InitializationKind::CreateDirect(Constructor->getLocation(), 1577 SourceLocation(), SourceLocation()); 1578 1579 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1580 &CopyCtorArg, 1); 1581 1582 Sema::OwningExprResult MemberInit = 1583 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1584 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1585 if (MemberInit.isInvalid()) 1586 return true; 1587 1588 CXXMemberInit = 0; 1589 return false; 1590 } 1591 1592 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1593 1594 QualType FieldBaseElementType = 1595 SemaRef.Context.getBaseElementType(Field->getType()); 1596 1597 if (FieldBaseElementType->isRecordType()) { 1598 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1599 InitializationKind InitKind = 1600 InitializationKind::CreateDefault(Constructor->getLocation()); 1601 1602 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1603 Sema::OwningExprResult MemberInit = 1604 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1605 Sema::MultiExprArg(SemaRef, 0, 0)); 1606 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1607 if (MemberInit.isInvalid()) 1608 return true; 1609 1610 CXXMemberInit = 1611 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1612 Field, SourceLocation(), 1613 SourceLocation(), 1614 MemberInit.takeAs<Expr>(), 1615 SourceLocation()); 1616 return false; 1617 } 1618 1619 if (FieldBaseElementType->isReferenceType()) { 1620 SemaRef.Diag(Constructor->getLocation(), 1621 diag::err_uninitialized_member_in_ctor) 1622 << (int)Constructor->isImplicit() 1623 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1624 << 0 << Field->getDeclName(); 1625 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1626 return true; 1627 } 1628 1629 if (FieldBaseElementType.isConstQualified()) { 1630 SemaRef.Diag(Constructor->getLocation(), 1631 diag::err_uninitialized_member_in_ctor) 1632 << (int)Constructor->isImplicit() 1633 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1634 << 1 << Field->getDeclName(); 1635 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1636 return true; 1637 } 1638 1639 // Nothing to initialize. 1640 CXXMemberInit = 0; 1641 return false; 1642} 1643 1644bool 1645Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1646 CXXBaseOrMemberInitializer **Initializers, 1647 unsigned NumInitializers, 1648 bool AnyErrors) { 1649 if (Constructor->getDeclContext()->isDependentContext()) { 1650 // Just store the initializers as written, they will be checked during 1651 // instantiation. 1652 if (NumInitializers > 0) { 1653 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1654 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1655 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1656 memcpy(baseOrMemberInitializers, Initializers, 1657 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1658 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1659 } 1660 1661 return false; 1662 } 1663 1664 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1665 1666 // FIXME: Handle implicit move constructors. 1667 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1668 ImplicitInitKind = IIK_Copy; 1669 1670 // We need to build the initializer AST according to order of construction 1671 // and not what user specified in the Initializers list. 1672 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1673 if (!ClassDecl) 1674 return true; 1675 1676 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1677 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1678 bool HadError = false; 1679 1680 for (unsigned i = 0; i < NumInitializers; i++) { 1681 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1682 1683 if (Member->isBaseInitializer()) 1684 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1685 else 1686 AllBaseFields[Member->getMember()] = Member; 1687 } 1688 1689 // Keep track of the direct virtual bases. 1690 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1691 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1692 E = ClassDecl->bases_end(); I != E; ++I) { 1693 if (I->isVirtual()) 1694 DirectVBases.insert(I); 1695 } 1696 1697 // Push virtual bases before others. 1698 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1699 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1700 1701 if (CXXBaseOrMemberInitializer *Value 1702 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1703 AllToInit.push_back(Value); 1704 } else if (!AnyErrors) { 1705 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1706 CXXBaseOrMemberInitializer *CXXBaseInit; 1707 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1708 VBase, IsInheritedVirtualBase, 1709 CXXBaseInit)) { 1710 HadError = true; 1711 continue; 1712 } 1713 1714 AllToInit.push_back(CXXBaseInit); 1715 } 1716 } 1717 1718 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1719 E = ClassDecl->bases_end(); Base != E; ++Base) { 1720 // Virtuals are in the virtual base list and already constructed. 1721 if (Base->isVirtual()) 1722 continue; 1723 1724 if (CXXBaseOrMemberInitializer *Value 1725 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1726 AllToInit.push_back(Value); 1727 } else if (!AnyErrors) { 1728 CXXBaseOrMemberInitializer *CXXBaseInit; 1729 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1730 Base, /*IsInheritedVirtualBase=*/false, 1731 CXXBaseInit)) { 1732 HadError = true; 1733 continue; 1734 } 1735 1736 AllToInit.push_back(CXXBaseInit); 1737 } 1738 } 1739 1740 // non-static data members. 1741 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1742 E = ClassDecl->field_end(); Field != E; ++Field) { 1743 if ((*Field)->isAnonymousStructOrUnion()) { 1744 if (const RecordType *FieldClassType = 1745 Field->getType()->getAs<RecordType>()) { 1746 CXXRecordDecl *FieldClassDecl 1747 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1748 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1749 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1750 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1751 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1752 // set to the anonymous union data member used in the initializer 1753 // list. 1754 Value->setMember(*Field); 1755 Value->setAnonUnionMember(*FA); 1756 AllToInit.push_back(Value); 1757 break; 1758 } 1759 } 1760 } 1761 continue; 1762 } 1763 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1764 AllToInit.push_back(Value); 1765 continue; 1766 } 1767 1768 if (AnyErrors) 1769 continue; 1770 1771 CXXBaseOrMemberInitializer *Member; 1772 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1773 *Field, Member)) { 1774 HadError = true; 1775 continue; 1776 } 1777 1778 // If the member doesn't need to be initialized, it will be null. 1779 if (Member) 1780 AllToInit.push_back(Member); 1781 } 1782 1783 NumInitializers = AllToInit.size(); 1784 if (NumInitializers > 0) { 1785 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1786 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1787 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1788 memcpy(baseOrMemberInitializers, AllToInit.data(), 1789 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1790 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1791 1792 // Constructors implicitly reference the base and member 1793 // destructors. 1794 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1795 Constructor->getParent()); 1796 } 1797 1798 return HadError; 1799} 1800 1801static void *GetKeyForTopLevelField(FieldDecl *Field) { 1802 // For anonymous unions, use the class declaration as the key. 1803 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1804 if (RT->getDecl()->isAnonymousStructOrUnion()) 1805 return static_cast<void *>(RT->getDecl()); 1806 } 1807 return static_cast<void *>(Field); 1808} 1809 1810static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1811 return Context.getCanonicalType(BaseType).getTypePtr(); 1812} 1813 1814static void *GetKeyForMember(ASTContext &Context, 1815 CXXBaseOrMemberInitializer *Member, 1816 bool MemberMaybeAnon = false) { 1817 if (!Member->isMemberInitializer()) 1818 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1819 1820 // For fields injected into the class via declaration of an anonymous union, 1821 // use its anonymous union class declaration as the unique key. 1822 FieldDecl *Field = Member->getMember(); 1823 1824 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1825 // data member of the class. Data member used in the initializer list is 1826 // in AnonUnionMember field. 1827 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1828 Field = Member->getAnonUnionMember(); 1829 1830 // If the field is a member of an anonymous struct or union, our key 1831 // is the anonymous record decl that's a direct child of the class. 1832 RecordDecl *RD = Field->getParent(); 1833 if (RD->isAnonymousStructOrUnion()) { 1834 while (true) { 1835 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1836 if (Parent->isAnonymousStructOrUnion()) 1837 RD = Parent; 1838 else 1839 break; 1840 } 1841 1842 return static_cast<void *>(RD); 1843 } 1844 1845 return static_cast<void *>(Field); 1846} 1847 1848static void 1849DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1850 const CXXConstructorDecl *Constructor, 1851 CXXBaseOrMemberInitializer **Inits, 1852 unsigned NumInits) { 1853 if (Constructor->getDeclContext()->isDependentContext()) 1854 return; 1855 1856 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1857 == Diagnostic::Ignored) 1858 return; 1859 1860 // Build the list of bases and members in the order that they'll 1861 // actually be initialized. The explicit initializers should be in 1862 // this same order but may be missing things. 1863 llvm::SmallVector<const void*, 32> IdealInitKeys; 1864 1865 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1866 1867 // 1. Virtual bases. 1868 for (CXXRecordDecl::base_class_const_iterator VBase = 1869 ClassDecl->vbases_begin(), 1870 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1871 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1872 1873 // 2. Non-virtual bases. 1874 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); Base != E; ++Base) { 1876 if (Base->isVirtual()) 1877 continue; 1878 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1879 } 1880 1881 // 3. Direct fields. 1882 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1883 E = ClassDecl->field_end(); Field != E; ++Field) 1884 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1885 1886 unsigned NumIdealInits = IdealInitKeys.size(); 1887 unsigned IdealIndex = 0; 1888 1889 CXXBaseOrMemberInitializer *PrevInit = 0; 1890 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1891 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1892 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1893 1894 // Scan forward to try to find this initializer in the idealized 1895 // initializers list. 1896 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1897 if (InitKey == IdealInitKeys[IdealIndex]) 1898 break; 1899 1900 // If we didn't find this initializer, it must be because we 1901 // scanned past it on a previous iteration. That can only 1902 // happen if we're out of order; emit a warning. 1903 if (IdealIndex == NumIdealInits) { 1904 assert(PrevInit && "initializer not found in initializer list"); 1905 1906 Sema::SemaDiagnosticBuilder D = 1907 SemaRef.Diag(PrevInit->getSourceLocation(), 1908 diag::warn_initializer_out_of_order); 1909 1910 if (PrevInit->isMemberInitializer()) 1911 D << 0 << PrevInit->getMember()->getDeclName(); 1912 else 1913 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1914 1915 if (Init->isMemberInitializer()) 1916 D << 0 << Init->getMember()->getDeclName(); 1917 else 1918 D << 1 << Init->getBaseClassInfo()->getType(); 1919 1920 // Move back to the initializer's location in the ideal list. 1921 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1922 if (InitKey == IdealInitKeys[IdealIndex]) 1923 break; 1924 1925 assert(IdealIndex != NumIdealInits && 1926 "initializer not found in initializer list"); 1927 } 1928 1929 PrevInit = Init; 1930 } 1931} 1932 1933namespace { 1934bool CheckRedundantInit(Sema &S, 1935 CXXBaseOrMemberInitializer *Init, 1936 CXXBaseOrMemberInitializer *&PrevInit) { 1937 if (!PrevInit) { 1938 PrevInit = Init; 1939 return false; 1940 } 1941 1942 if (FieldDecl *Field = Init->getMember()) 1943 S.Diag(Init->getSourceLocation(), 1944 diag::err_multiple_mem_initialization) 1945 << Field->getDeclName() 1946 << Init->getSourceRange(); 1947 else { 1948 Type *BaseClass = Init->getBaseClass(); 1949 assert(BaseClass && "neither field nor base"); 1950 S.Diag(Init->getSourceLocation(), 1951 diag::err_multiple_base_initialization) 1952 << QualType(BaseClass, 0) 1953 << Init->getSourceRange(); 1954 } 1955 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1956 << 0 << PrevInit->getSourceRange(); 1957 1958 return true; 1959} 1960 1961typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1962typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1963 1964bool CheckRedundantUnionInit(Sema &S, 1965 CXXBaseOrMemberInitializer *Init, 1966 RedundantUnionMap &Unions) { 1967 FieldDecl *Field = Init->getMember(); 1968 RecordDecl *Parent = Field->getParent(); 1969 if (!Parent->isAnonymousStructOrUnion()) 1970 return false; 1971 1972 NamedDecl *Child = Field; 1973 do { 1974 if (Parent->isUnion()) { 1975 UnionEntry &En = Unions[Parent]; 1976 if (En.first && En.first != Child) { 1977 S.Diag(Init->getSourceLocation(), 1978 diag::err_multiple_mem_union_initialization) 1979 << Field->getDeclName() 1980 << Init->getSourceRange(); 1981 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1982 << 0 << En.second->getSourceRange(); 1983 return true; 1984 } else if (!En.first) { 1985 En.first = Child; 1986 En.second = Init; 1987 } 1988 } 1989 1990 Child = Parent; 1991 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1992 } while (Parent->isAnonymousStructOrUnion()); 1993 1994 return false; 1995} 1996} 1997 1998/// ActOnMemInitializers - Handle the member initializers for a constructor. 1999void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2000 SourceLocation ColonLoc, 2001 MemInitTy **meminits, unsigned NumMemInits, 2002 bool AnyErrors) { 2003 if (!ConstructorDecl) 2004 return; 2005 2006 AdjustDeclIfTemplate(ConstructorDecl); 2007 2008 CXXConstructorDecl *Constructor 2009 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2010 2011 if (!Constructor) { 2012 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2013 return; 2014 } 2015 2016 CXXBaseOrMemberInitializer **MemInits = 2017 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2018 2019 // Mapping for the duplicate initializers check. 2020 // For member initializers, this is keyed with a FieldDecl*. 2021 // For base initializers, this is keyed with a Type*. 2022 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2023 2024 // Mapping for the inconsistent anonymous-union initializers check. 2025 RedundantUnionMap MemberUnions; 2026 2027 bool HadError = false; 2028 for (unsigned i = 0; i < NumMemInits; i++) { 2029 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2030 2031 if (Init->isMemberInitializer()) { 2032 FieldDecl *Field = Init->getMember(); 2033 if (CheckRedundantInit(*this, Init, Members[Field]) || 2034 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2035 HadError = true; 2036 } else { 2037 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2038 if (CheckRedundantInit(*this, Init, Members[Key])) 2039 HadError = true; 2040 } 2041 } 2042 2043 if (HadError) 2044 return; 2045 2046 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2047 2048 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2049} 2050 2051void 2052Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2053 CXXRecordDecl *ClassDecl) { 2054 // Ignore dependent contexts. 2055 if (ClassDecl->isDependentContext()) 2056 return; 2057 2058 // FIXME: all the access-control diagnostics are positioned on the 2059 // field/base declaration. That's probably good; that said, the 2060 // user might reasonably want to know why the destructor is being 2061 // emitted, and we currently don't say. 2062 2063 // Non-static data members. 2064 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2065 E = ClassDecl->field_end(); I != E; ++I) { 2066 FieldDecl *Field = *I; 2067 2068 QualType FieldType = Context.getBaseElementType(Field->getType()); 2069 2070 const RecordType* RT = FieldType->getAs<RecordType>(); 2071 if (!RT) 2072 continue; 2073 2074 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2075 if (FieldClassDecl->hasTrivialDestructor()) 2076 continue; 2077 2078 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2079 CheckDestructorAccess(Field->getLocation(), Dtor, 2080 PDiag(diag::err_access_dtor_field) 2081 << Field->getDeclName() 2082 << FieldType); 2083 2084 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2085 } 2086 2087 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2088 2089 // Bases. 2090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2091 E = ClassDecl->bases_end(); Base != E; ++Base) { 2092 // Bases are always records in a well-formed non-dependent class. 2093 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2094 2095 // Remember direct virtual bases. 2096 if (Base->isVirtual()) 2097 DirectVirtualBases.insert(RT); 2098 2099 // Ignore trivial destructors. 2100 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2101 if (BaseClassDecl->hasTrivialDestructor()) 2102 continue; 2103 2104 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2105 2106 // FIXME: caret should be on the start of the class name 2107 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2108 PDiag(diag::err_access_dtor_base) 2109 << Base->getType() 2110 << Base->getSourceRange()); 2111 2112 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2113 } 2114 2115 // Virtual bases. 2116 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2117 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2118 2119 // Bases are always records in a well-formed non-dependent class. 2120 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2121 2122 // Ignore direct virtual bases. 2123 if (DirectVirtualBases.count(RT)) 2124 continue; 2125 2126 // Ignore trivial destructors. 2127 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2128 if (BaseClassDecl->hasTrivialDestructor()) 2129 continue; 2130 2131 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2132 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2133 PDiag(diag::err_access_dtor_vbase) 2134 << VBase->getType()); 2135 2136 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2137 } 2138} 2139 2140void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2141 if (!CDtorDecl) 2142 return; 2143 2144 if (CXXConstructorDecl *Constructor 2145 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2146 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2147} 2148 2149bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2150 unsigned DiagID, AbstractDiagSelID SelID, 2151 const CXXRecordDecl *CurrentRD) { 2152 if (SelID == -1) 2153 return RequireNonAbstractType(Loc, T, 2154 PDiag(DiagID), CurrentRD); 2155 else 2156 return RequireNonAbstractType(Loc, T, 2157 PDiag(DiagID) << SelID, CurrentRD); 2158} 2159 2160bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2161 const PartialDiagnostic &PD, 2162 const CXXRecordDecl *CurrentRD) { 2163 if (!getLangOptions().CPlusPlus) 2164 return false; 2165 2166 if (const ArrayType *AT = Context.getAsArrayType(T)) 2167 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2168 CurrentRD); 2169 2170 if (const PointerType *PT = T->getAs<PointerType>()) { 2171 // Find the innermost pointer type. 2172 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2173 PT = T; 2174 2175 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2176 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2177 } 2178 2179 const RecordType *RT = T->getAs<RecordType>(); 2180 if (!RT) 2181 return false; 2182 2183 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2184 2185 if (CurrentRD && CurrentRD != RD) 2186 return false; 2187 2188 // FIXME: is this reasonable? It matches current behavior, but.... 2189 if (!RD->getDefinition()) 2190 return false; 2191 2192 if (!RD->isAbstract()) 2193 return false; 2194 2195 Diag(Loc, PD) << RD->getDeclName(); 2196 2197 // Check if we've already emitted the list of pure virtual functions for this 2198 // class. 2199 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2200 return true; 2201 2202 CXXFinalOverriderMap FinalOverriders; 2203 RD->getFinalOverriders(FinalOverriders); 2204 2205 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2206 MEnd = FinalOverriders.end(); 2207 M != MEnd; 2208 ++M) { 2209 for (OverridingMethods::iterator SO = M->second.begin(), 2210 SOEnd = M->second.end(); 2211 SO != SOEnd; ++SO) { 2212 // C++ [class.abstract]p4: 2213 // A class is abstract if it contains or inherits at least one 2214 // pure virtual function for which the final overrider is pure 2215 // virtual. 2216 2217 // 2218 if (SO->second.size() != 1) 2219 continue; 2220 2221 if (!SO->second.front().Method->isPure()) 2222 continue; 2223 2224 Diag(SO->second.front().Method->getLocation(), 2225 diag::note_pure_virtual_function) 2226 << SO->second.front().Method->getDeclName(); 2227 } 2228 } 2229 2230 if (!PureVirtualClassDiagSet) 2231 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2232 PureVirtualClassDiagSet->insert(RD); 2233 2234 return true; 2235} 2236 2237namespace { 2238 class AbstractClassUsageDiagnoser 2239 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2240 Sema &SemaRef; 2241 CXXRecordDecl *AbstractClass; 2242 2243 bool VisitDeclContext(const DeclContext *DC) { 2244 bool Invalid = false; 2245 2246 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2247 E = DC->decls_end(); I != E; ++I) 2248 Invalid |= Visit(*I); 2249 2250 return Invalid; 2251 } 2252 2253 public: 2254 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2255 : SemaRef(SemaRef), AbstractClass(ac) { 2256 Visit(SemaRef.Context.getTranslationUnitDecl()); 2257 } 2258 2259 bool VisitFunctionDecl(const FunctionDecl *FD) { 2260 if (FD->isThisDeclarationADefinition()) { 2261 // No need to do the check if we're in a definition, because it requires 2262 // that the return/param types are complete. 2263 // because that requires 2264 return VisitDeclContext(FD); 2265 } 2266 2267 // Check the return type. 2268 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2269 bool Invalid = 2270 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2271 diag::err_abstract_type_in_decl, 2272 Sema::AbstractReturnType, 2273 AbstractClass); 2274 2275 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2276 E = FD->param_end(); I != E; ++I) { 2277 const ParmVarDecl *VD = *I; 2278 Invalid |= 2279 SemaRef.RequireNonAbstractType(VD->getLocation(), 2280 VD->getOriginalType(), 2281 diag::err_abstract_type_in_decl, 2282 Sema::AbstractParamType, 2283 AbstractClass); 2284 } 2285 2286 return Invalid; 2287 } 2288 2289 bool VisitDecl(const Decl* D) { 2290 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2291 return VisitDeclContext(DC); 2292 2293 return false; 2294 } 2295 }; 2296} 2297 2298/// \brief Perform semantic checks on a class definition that has been 2299/// completing, introducing implicitly-declared members, checking for 2300/// abstract types, etc. 2301void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2302 if (!Record || Record->isInvalidDecl()) 2303 return; 2304 2305 if (!Record->isDependentType()) 2306 AddImplicitlyDeclaredMembersToClass(S, Record); 2307 2308 if (Record->isInvalidDecl()) 2309 return; 2310 2311 // Set access bits correctly on the directly-declared conversions. 2312 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2313 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2314 Convs->setAccess(I, (*I)->getAccess()); 2315 2316 // Determine whether we need to check for final overriders. We do 2317 // this either when there are virtual base classes (in which case we 2318 // may end up finding multiple final overriders for a given virtual 2319 // function) or any of the base classes is abstract (in which case 2320 // we might detect that this class is abstract). 2321 bool CheckFinalOverriders = false; 2322 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2323 !Record->isDependentType()) { 2324 if (Record->getNumVBases()) 2325 CheckFinalOverriders = true; 2326 else if (!Record->isAbstract()) { 2327 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2328 BEnd = Record->bases_end(); 2329 B != BEnd; ++B) { 2330 CXXRecordDecl *BaseDecl 2331 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2332 if (BaseDecl->isAbstract()) { 2333 CheckFinalOverriders = true; 2334 break; 2335 } 2336 } 2337 } 2338 } 2339 2340 if (CheckFinalOverriders) { 2341 CXXFinalOverriderMap FinalOverriders; 2342 Record->getFinalOverriders(FinalOverriders); 2343 2344 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2345 MEnd = FinalOverriders.end(); 2346 M != MEnd; ++M) { 2347 for (OverridingMethods::iterator SO = M->second.begin(), 2348 SOEnd = M->second.end(); 2349 SO != SOEnd; ++SO) { 2350 assert(SO->second.size() > 0 && 2351 "All virtual functions have overridding virtual functions"); 2352 if (SO->second.size() == 1) { 2353 // C++ [class.abstract]p4: 2354 // A class is abstract if it contains or inherits at least one 2355 // pure virtual function for which the final overrider is pure 2356 // virtual. 2357 if (SO->second.front().Method->isPure()) 2358 Record->setAbstract(true); 2359 continue; 2360 } 2361 2362 // C++ [class.virtual]p2: 2363 // In a derived class, if a virtual member function of a base 2364 // class subobject has more than one final overrider the 2365 // program is ill-formed. 2366 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2367 << (NamedDecl *)M->first << Record; 2368 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2369 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2370 OMEnd = SO->second.end(); 2371 OM != OMEnd; ++OM) 2372 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2373 << (NamedDecl *)M->first << OM->Method->getParent(); 2374 2375 Record->setInvalidDecl(); 2376 } 2377 } 2378 } 2379 2380 if (Record->isAbstract() && !Record->isInvalidDecl()) 2381 (void)AbstractClassUsageDiagnoser(*this, Record); 2382 2383 // If this is not an aggregate type and has no user-declared constructor, 2384 // complain about any non-static data members of reference or const scalar 2385 // type, since they will never get initializers. 2386 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2387 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2388 bool Complained = false; 2389 for (RecordDecl::field_iterator F = Record->field_begin(), 2390 FEnd = Record->field_end(); 2391 F != FEnd; ++F) { 2392 if (F->getType()->isReferenceType() || 2393 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2394 if (!Complained) { 2395 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2396 << Record->getTagKind() << Record; 2397 Complained = true; 2398 } 2399 2400 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2401 << F->getType()->isReferenceType() 2402 << F->getDeclName(); 2403 } 2404 } 2405 } 2406} 2407 2408void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2409 DeclPtrTy TagDecl, 2410 SourceLocation LBrac, 2411 SourceLocation RBrac, 2412 AttributeList *AttrList) { 2413 if (!TagDecl) 2414 return; 2415 2416 AdjustDeclIfTemplate(TagDecl); 2417 2418 ActOnFields(S, RLoc, TagDecl, 2419 (DeclPtrTy*)FieldCollector->getCurFields(), 2420 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2421 2422 CheckCompletedCXXClass(S, 2423 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2424} 2425 2426/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2427/// special functions, such as the default constructor, copy 2428/// constructor, or destructor, to the given C++ class (C++ 2429/// [special]p1). This routine can only be executed just before the 2430/// definition of the class is complete. 2431/// 2432/// The scope, if provided, is the class scope. 2433void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2434 CXXRecordDecl *ClassDecl) { 2435 CanQualType ClassType 2436 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2437 2438 // FIXME: Implicit declarations have exception specifications, which are 2439 // the union of the specifications of the implicitly called functions. 2440 2441 if (!ClassDecl->hasUserDeclaredConstructor()) { 2442 // C++ [class.ctor]p5: 2443 // A default constructor for a class X is a constructor of class X 2444 // that can be called without an argument. If there is no 2445 // user-declared constructor for class X, a default constructor is 2446 // implicitly declared. An implicitly-declared default constructor 2447 // is an inline public member of its class. 2448 DeclarationName Name 2449 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2450 CXXConstructorDecl *DefaultCon = 2451 CXXConstructorDecl::Create(Context, ClassDecl, 2452 ClassDecl->getLocation(), Name, 2453 Context.getFunctionType(Context.VoidTy, 2454 0, 0, false, 0, 2455 /*FIXME*/false, false, 2456 0, 0, 2457 FunctionType::ExtInfo()), 2458 /*TInfo=*/0, 2459 /*isExplicit=*/false, 2460 /*isInline=*/true, 2461 /*isImplicitlyDeclared=*/true); 2462 DefaultCon->setAccess(AS_public); 2463 DefaultCon->setImplicit(); 2464 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2465 if (S) 2466 PushOnScopeChains(DefaultCon, S, true); 2467 else 2468 ClassDecl->addDecl(DefaultCon); 2469 } 2470 2471 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2472 // C++ [class.copy]p4: 2473 // If the class definition does not explicitly declare a copy 2474 // constructor, one is declared implicitly. 2475 2476 // C++ [class.copy]p5: 2477 // The implicitly-declared copy constructor for a class X will 2478 // have the form 2479 // 2480 // X::X(const X&) 2481 // 2482 // if 2483 bool HasConstCopyConstructor = true; 2484 2485 // -- each direct or virtual base class B of X has a copy 2486 // constructor whose first parameter is of type const B& or 2487 // const volatile B&, and 2488 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2489 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2490 const CXXRecordDecl *BaseClassDecl 2491 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2492 HasConstCopyConstructor 2493 = BaseClassDecl->hasConstCopyConstructor(Context); 2494 } 2495 2496 // -- for all the nonstatic data members of X that are of a 2497 // class type M (or array thereof), each such class type 2498 // has a copy constructor whose first parameter is of type 2499 // const M& or const volatile M&. 2500 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2501 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2502 ++Field) { 2503 QualType FieldType = (*Field)->getType(); 2504 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2505 FieldType = Array->getElementType(); 2506 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2507 const CXXRecordDecl *FieldClassDecl 2508 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2509 HasConstCopyConstructor 2510 = FieldClassDecl->hasConstCopyConstructor(Context); 2511 } 2512 } 2513 2514 // Otherwise, the implicitly declared copy constructor will have 2515 // the form 2516 // 2517 // X::X(X&) 2518 QualType ArgType = ClassType; 2519 if (HasConstCopyConstructor) 2520 ArgType = ArgType.withConst(); 2521 ArgType = Context.getLValueReferenceType(ArgType); 2522 2523 // An implicitly-declared copy constructor is an inline public 2524 // member of its class. 2525 DeclarationName Name 2526 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2527 CXXConstructorDecl *CopyConstructor 2528 = CXXConstructorDecl::Create(Context, ClassDecl, 2529 ClassDecl->getLocation(), Name, 2530 Context.getFunctionType(Context.VoidTy, 2531 &ArgType, 1, 2532 false, 0, 2533 /*FIXME:*/false, 2534 false, 0, 0, 2535 FunctionType::ExtInfo()), 2536 /*TInfo=*/0, 2537 /*isExplicit=*/false, 2538 /*isInline=*/true, 2539 /*isImplicitlyDeclared=*/true); 2540 CopyConstructor->setAccess(AS_public); 2541 CopyConstructor->setImplicit(); 2542 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2543 2544 // Add the parameter to the constructor. 2545 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2546 ClassDecl->getLocation(), 2547 /*IdentifierInfo=*/0, 2548 ArgType, /*TInfo=*/0, 2549 VarDecl::None, 2550 VarDecl::None, 0); 2551 CopyConstructor->setParams(&FromParam, 1); 2552 if (S) 2553 PushOnScopeChains(CopyConstructor, S, true); 2554 else 2555 ClassDecl->addDecl(CopyConstructor); 2556 } 2557 2558 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2559 // Note: The following rules are largely analoguous to the copy 2560 // constructor rules. Note that virtual bases are not taken into account 2561 // for determining the argument type of the operator. Note also that 2562 // operators taking an object instead of a reference are allowed. 2563 // 2564 // C++ [class.copy]p10: 2565 // If the class definition does not explicitly declare a copy 2566 // assignment operator, one is declared implicitly. 2567 // The implicitly-defined copy assignment operator for a class X 2568 // will have the form 2569 // 2570 // X& X::operator=(const X&) 2571 // 2572 // if 2573 bool HasConstCopyAssignment = true; 2574 2575 // -- each direct base class B of X has a copy assignment operator 2576 // whose parameter is of type const B&, const volatile B& or B, 2577 // and 2578 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2579 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2580 assert(!Base->getType()->isDependentType() && 2581 "Cannot generate implicit members for class with dependent bases."); 2582 const CXXRecordDecl *BaseClassDecl 2583 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2584 const CXXMethodDecl *MD = 0; 2585 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2586 MD); 2587 } 2588 2589 // -- for all the nonstatic data members of X that are of a class 2590 // type M (or array thereof), each such class type has a copy 2591 // assignment operator whose parameter is of type const M&, 2592 // const volatile M& or M. 2593 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2594 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2595 ++Field) { 2596 QualType FieldType = (*Field)->getType(); 2597 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2598 FieldType = Array->getElementType(); 2599 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2600 const CXXRecordDecl *FieldClassDecl 2601 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2602 const CXXMethodDecl *MD = 0; 2603 HasConstCopyAssignment 2604 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2605 } 2606 } 2607 2608 // Otherwise, the implicitly declared copy assignment operator will 2609 // have the form 2610 // 2611 // X& X::operator=(X&) 2612 QualType ArgType = ClassType; 2613 QualType RetType = Context.getLValueReferenceType(ArgType); 2614 if (HasConstCopyAssignment) 2615 ArgType = ArgType.withConst(); 2616 ArgType = Context.getLValueReferenceType(ArgType); 2617 2618 // An implicitly-declared copy assignment operator is an inline public 2619 // member of its class. 2620 DeclarationName Name = 2621 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2622 CXXMethodDecl *CopyAssignment = 2623 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2624 Context.getFunctionType(RetType, &ArgType, 1, 2625 false, 0, 2626 /*FIXME:*/false, 2627 false, 0, 0, 2628 FunctionType::ExtInfo()), 2629 /*TInfo=*/0, /*isStatic=*/false, 2630 /*StorageClassAsWritten=*/FunctionDecl::None, 2631 /*isInline=*/true); 2632 CopyAssignment->setAccess(AS_public); 2633 CopyAssignment->setImplicit(); 2634 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2635 CopyAssignment->setCopyAssignment(true); 2636 2637 // Add the parameter to the operator. 2638 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2639 ClassDecl->getLocation(), 2640 /*Id=*/0, 2641 ArgType, /*TInfo=*/0, 2642 VarDecl::None, 2643 VarDecl::None, 0); 2644 CopyAssignment->setParams(&FromParam, 1); 2645 2646 // Don't call addedAssignmentOperator. There is no way to distinguish an 2647 // implicit from an explicit assignment operator. 2648 if (S) 2649 PushOnScopeChains(CopyAssignment, S, true); 2650 else 2651 ClassDecl->addDecl(CopyAssignment); 2652 AddOverriddenMethods(ClassDecl, CopyAssignment); 2653 } 2654 2655 if (!ClassDecl->hasUserDeclaredDestructor()) { 2656 // C++ [class.dtor]p2: 2657 // If a class has no user-declared destructor, a destructor is 2658 // declared implicitly. An implicitly-declared destructor is an 2659 // inline public member of its class. 2660 QualType Ty = Context.getFunctionType(Context.VoidTy, 2661 0, 0, false, 0, 2662 /*FIXME:*/false, 2663 false, 0, 0, FunctionType::ExtInfo()); 2664 2665 DeclarationName Name 2666 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2667 CXXDestructorDecl *Destructor 2668 = CXXDestructorDecl::Create(Context, ClassDecl, 2669 ClassDecl->getLocation(), Name, Ty, 2670 /*isInline=*/true, 2671 /*isImplicitlyDeclared=*/true); 2672 Destructor->setAccess(AS_public); 2673 Destructor->setImplicit(); 2674 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2675 if (S) 2676 PushOnScopeChains(Destructor, S, true); 2677 else 2678 ClassDecl->addDecl(Destructor); 2679 2680 // This could be uniqued if it ever proves significant. 2681 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2682 2683 AddOverriddenMethods(ClassDecl, Destructor); 2684 } 2685} 2686 2687void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2688 Decl *D = TemplateD.getAs<Decl>(); 2689 if (!D) 2690 return; 2691 2692 TemplateParameterList *Params = 0; 2693 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2694 Params = Template->getTemplateParameters(); 2695 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2696 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2697 Params = PartialSpec->getTemplateParameters(); 2698 else 2699 return; 2700 2701 for (TemplateParameterList::iterator Param = Params->begin(), 2702 ParamEnd = Params->end(); 2703 Param != ParamEnd; ++Param) { 2704 NamedDecl *Named = cast<NamedDecl>(*Param); 2705 if (Named->getDeclName()) { 2706 S->AddDecl(DeclPtrTy::make(Named)); 2707 IdResolver.AddDecl(Named); 2708 } 2709 } 2710} 2711 2712void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2713 if (!RecordD) return; 2714 AdjustDeclIfTemplate(RecordD); 2715 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2716 PushDeclContext(S, Record); 2717} 2718 2719void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2720 if (!RecordD) return; 2721 PopDeclContext(); 2722} 2723 2724/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2725/// parsing a top-level (non-nested) C++ class, and we are now 2726/// parsing those parts of the given Method declaration that could 2727/// not be parsed earlier (C++ [class.mem]p2), such as default 2728/// arguments. This action should enter the scope of the given 2729/// Method declaration as if we had just parsed the qualified method 2730/// name. However, it should not bring the parameters into scope; 2731/// that will be performed by ActOnDelayedCXXMethodParameter. 2732void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2733} 2734 2735/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2736/// C++ method declaration. We're (re-)introducing the given 2737/// function parameter into scope for use in parsing later parts of 2738/// the method declaration. For example, we could see an 2739/// ActOnParamDefaultArgument event for this parameter. 2740void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2741 if (!ParamD) 2742 return; 2743 2744 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2745 2746 // If this parameter has an unparsed default argument, clear it out 2747 // to make way for the parsed default argument. 2748 if (Param->hasUnparsedDefaultArg()) 2749 Param->setDefaultArg(0); 2750 2751 S->AddDecl(DeclPtrTy::make(Param)); 2752 if (Param->getDeclName()) 2753 IdResolver.AddDecl(Param); 2754} 2755 2756/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2757/// processing the delayed method declaration for Method. The method 2758/// declaration is now considered finished. There may be a separate 2759/// ActOnStartOfFunctionDef action later (not necessarily 2760/// immediately!) for this method, if it was also defined inside the 2761/// class body. 2762void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2763 if (!MethodD) 2764 return; 2765 2766 AdjustDeclIfTemplate(MethodD); 2767 2768 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2769 2770 // Now that we have our default arguments, check the constructor 2771 // again. It could produce additional diagnostics or affect whether 2772 // the class has implicitly-declared destructors, among other 2773 // things. 2774 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2775 CheckConstructor(Constructor); 2776 2777 // Check the default arguments, which we may have added. 2778 if (!Method->isInvalidDecl()) 2779 CheckCXXDefaultArguments(Method); 2780} 2781 2782/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2783/// the well-formedness of the constructor declarator @p D with type @p 2784/// R. If there are any errors in the declarator, this routine will 2785/// emit diagnostics and set the invalid bit to true. In any case, the type 2786/// will be updated to reflect a well-formed type for the constructor and 2787/// returned. 2788QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2789 FunctionDecl::StorageClass &SC) { 2790 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2791 2792 // C++ [class.ctor]p3: 2793 // A constructor shall not be virtual (10.3) or static (9.4). A 2794 // constructor can be invoked for a const, volatile or const 2795 // volatile object. A constructor shall not be declared const, 2796 // volatile, or const volatile (9.3.2). 2797 if (isVirtual) { 2798 if (!D.isInvalidType()) 2799 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2800 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2801 << SourceRange(D.getIdentifierLoc()); 2802 D.setInvalidType(); 2803 } 2804 if (SC == FunctionDecl::Static) { 2805 if (!D.isInvalidType()) 2806 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2807 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2808 << SourceRange(D.getIdentifierLoc()); 2809 D.setInvalidType(); 2810 SC = FunctionDecl::None; 2811 } 2812 2813 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2814 if (FTI.TypeQuals != 0) { 2815 if (FTI.TypeQuals & Qualifiers::Const) 2816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2817 << "const" << SourceRange(D.getIdentifierLoc()); 2818 if (FTI.TypeQuals & Qualifiers::Volatile) 2819 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2820 << "volatile" << SourceRange(D.getIdentifierLoc()); 2821 if (FTI.TypeQuals & Qualifiers::Restrict) 2822 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2823 << "restrict" << SourceRange(D.getIdentifierLoc()); 2824 } 2825 2826 // Rebuild the function type "R" without any type qualifiers (in 2827 // case any of the errors above fired) and with "void" as the 2828 // return type, since constructors don't have return types. We 2829 // *always* have to do this, because GetTypeForDeclarator will 2830 // put in a result type of "int" when none was specified. 2831 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2832 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2833 Proto->getNumArgs(), 2834 Proto->isVariadic(), 0, 2835 Proto->hasExceptionSpec(), 2836 Proto->hasAnyExceptionSpec(), 2837 Proto->getNumExceptions(), 2838 Proto->exception_begin(), 2839 Proto->getExtInfo()); 2840} 2841 2842/// CheckConstructor - Checks a fully-formed constructor for 2843/// well-formedness, issuing any diagnostics required. Returns true if 2844/// the constructor declarator is invalid. 2845void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2846 CXXRecordDecl *ClassDecl 2847 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2848 if (!ClassDecl) 2849 return Constructor->setInvalidDecl(); 2850 2851 // C++ [class.copy]p3: 2852 // A declaration of a constructor for a class X is ill-formed if 2853 // its first parameter is of type (optionally cv-qualified) X and 2854 // either there are no other parameters or else all other 2855 // parameters have default arguments. 2856 if (!Constructor->isInvalidDecl() && 2857 ((Constructor->getNumParams() == 1) || 2858 (Constructor->getNumParams() > 1 && 2859 Constructor->getParamDecl(1)->hasDefaultArg())) && 2860 Constructor->getTemplateSpecializationKind() 2861 != TSK_ImplicitInstantiation) { 2862 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2863 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2864 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2865 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2866 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2867 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2868 2869 // FIXME: Rather that making the constructor invalid, we should endeavor 2870 // to fix the type. 2871 Constructor->setInvalidDecl(); 2872 } 2873 } 2874 2875 // Notify the class that we've added a constructor. In principle we 2876 // don't need to do this for out-of-line declarations; in practice 2877 // we only instantiate the most recent declaration of a method, so 2878 // we have to call this for everything but friends. 2879 if (!Constructor->getFriendObjectKind()) 2880 ClassDecl->addedConstructor(Context, Constructor); 2881} 2882 2883/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2884/// issuing any diagnostics required. Returns true on error. 2885bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2886 CXXRecordDecl *RD = Destructor->getParent(); 2887 2888 if (Destructor->isVirtual()) { 2889 SourceLocation Loc; 2890 2891 if (!Destructor->isImplicit()) 2892 Loc = Destructor->getLocation(); 2893 else 2894 Loc = RD->getLocation(); 2895 2896 // If we have a virtual destructor, look up the deallocation function 2897 FunctionDecl *OperatorDelete = 0; 2898 DeclarationName Name = 2899 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2900 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2901 return true; 2902 2903 Destructor->setOperatorDelete(OperatorDelete); 2904 } 2905 2906 return false; 2907} 2908 2909static inline bool 2910FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2911 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2912 FTI.ArgInfo[0].Param && 2913 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2914} 2915 2916/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2917/// the well-formednes of the destructor declarator @p D with type @p 2918/// R. If there are any errors in the declarator, this routine will 2919/// emit diagnostics and set the declarator to invalid. Even if this happens, 2920/// will be updated to reflect a well-formed type for the destructor and 2921/// returned. 2922QualType Sema::CheckDestructorDeclarator(Declarator &D, 2923 FunctionDecl::StorageClass& SC) { 2924 // C++ [class.dtor]p1: 2925 // [...] A typedef-name that names a class is a class-name 2926 // (7.1.3); however, a typedef-name that names a class shall not 2927 // be used as the identifier in the declarator for a destructor 2928 // declaration. 2929 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2930 if (isa<TypedefType>(DeclaratorType)) { 2931 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2932 << DeclaratorType; 2933 D.setInvalidType(); 2934 } 2935 2936 // C++ [class.dtor]p2: 2937 // A destructor is used to destroy objects of its class type. A 2938 // destructor takes no parameters, and no return type can be 2939 // specified for it (not even void). The address of a destructor 2940 // shall not be taken. A destructor shall not be static. A 2941 // destructor can be invoked for a const, volatile or const 2942 // volatile object. A destructor shall not be declared const, 2943 // volatile or const volatile (9.3.2). 2944 if (SC == FunctionDecl::Static) { 2945 if (!D.isInvalidType()) 2946 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2947 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2948 << SourceRange(D.getIdentifierLoc()); 2949 SC = FunctionDecl::None; 2950 D.setInvalidType(); 2951 } 2952 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2953 // Destructors don't have return types, but the parser will 2954 // happily parse something like: 2955 // 2956 // class X { 2957 // float ~X(); 2958 // }; 2959 // 2960 // The return type will be eliminated later. 2961 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2962 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2963 << SourceRange(D.getIdentifierLoc()); 2964 } 2965 2966 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2967 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2968 if (FTI.TypeQuals & Qualifiers::Const) 2969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2970 << "const" << SourceRange(D.getIdentifierLoc()); 2971 if (FTI.TypeQuals & Qualifiers::Volatile) 2972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2973 << "volatile" << SourceRange(D.getIdentifierLoc()); 2974 if (FTI.TypeQuals & Qualifiers::Restrict) 2975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2976 << "restrict" << SourceRange(D.getIdentifierLoc()); 2977 D.setInvalidType(); 2978 } 2979 2980 // Make sure we don't have any parameters. 2981 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2982 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2983 2984 // Delete the parameters. 2985 FTI.freeArgs(); 2986 D.setInvalidType(); 2987 } 2988 2989 // Make sure the destructor isn't variadic. 2990 if (FTI.isVariadic) { 2991 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2992 D.setInvalidType(); 2993 } 2994 2995 // Rebuild the function type "R" without any type qualifiers or 2996 // parameters (in case any of the errors above fired) and with 2997 // "void" as the return type, since destructors don't have return 2998 // types. We *always* have to do this, because GetTypeForDeclarator 2999 // will put in a result type of "int" when none was specified. 3000 // FIXME: Exceptions! 3001 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3002 false, false, 0, 0, FunctionType::ExtInfo()); 3003} 3004 3005/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3006/// well-formednes of the conversion function declarator @p D with 3007/// type @p R. If there are any errors in the declarator, this routine 3008/// will emit diagnostics and return true. Otherwise, it will return 3009/// false. Either way, the type @p R will be updated to reflect a 3010/// well-formed type for the conversion operator. 3011void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3012 FunctionDecl::StorageClass& SC) { 3013 // C++ [class.conv.fct]p1: 3014 // Neither parameter types nor return type can be specified. The 3015 // type of a conversion function (8.3.5) is "function taking no 3016 // parameter returning conversion-type-id." 3017 if (SC == FunctionDecl::Static) { 3018 if (!D.isInvalidType()) 3019 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3020 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3021 << SourceRange(D.getIdentifierLoc()); 3022 D.setInvalidType(); 3023 SC = FunctionDecl::None; 3024 } 3025 3026 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3027 3028 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3029 // Conversion functions don't have return types, but the parser will 3030 // happily parse something like: 3031 // 3032 // class X { 3033 // float operator bool(); 3034 // }; 3035 // 3036 // The return type will be changed later anyway. 3037 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3038 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3039 << SourceRange(D.getIdentifierLoc()); 3040 D.setInvalidType(); 3041 } 3042 3043 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3044 3045 // Make sure we don't have any parameters. 3046 if (Proto->getNumArgs() > 0) { 3047 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3048 3049 // Delete the parameters. 3050 D.getTypeObject(0).Fun.freeArgs(); 3051 D.setInvalidType(); 3052 } else if (Proto->isVariadic()) { 3053 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3054 D.setInvalidType(); 3055 } 3056 3057 // Diagnose "&operator bool()" and other such nonsense. This 3058 // is actually a gcc extension which we don't support. 3059 if (Proto->getResultType() != ConvType) { 3060 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3061 << Proto->getResultType(); 3062 D.setInvalidType(); 3063 ConvType = Proto->getResultType(); 3064 } 3065 3066 // C++ [class.conv.fct]p4: 3067 // The conversion-type-id shall not represent a function type nor 3068 // an array type. 3069 if (ConvType->isArrayType()) { 3070 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3071 ConvType = Context.getPointerType(ConvType); 3072 D.setInvalidType(); 3073 } else if (ConvType->isFunctionType()) { 3074 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3075 ConvType = Context.getPointerType(ConvType); 3076 D.setInvalidType(); 3077 } 3078 3079 // Rebuild the function type "R" without any parameters (in case any 3080 // of the errors above fired) and with the conversion type as the 3081 // return type. 3082 if (D.isInvalidType()) { 3083 R = Context.getFunctionType(ConvType, 0, 0, false, 3084 Proto->getTypeQuals(), 3085 Proto->hasExceptionSpec(), 3086 Proto->hasAnyExceptionSpec(), 3087 Proto->getNumExceptions(), 3088 Proto->exception_begin(), 3089 Proto->getExtInfo()); 3090 } 3091 3092 // C++0x explicit conversion operators. 3093 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3094 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3095 diag::warn_explicit_conversion_functions) 3096 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3097} 3098 3099/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3100/// the declaration of the given C++ conversion function. This routine 3101/// is responsible for recording the conversion function in the C++ 3102/// class, if possible. 3103Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3104 assert(Conversion && "Expected to receive a conversion function declaration"); 3105 3106 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3107 3108 // Make sure we aren't redeclaring the conversion function. 3109 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3110 3111 // C++ [class.conv.fct]p1: 3112 // [...] A conversion function is never used to convert a 3113 // (possibly cv-qualified) object to the (possibly cv-qualified) 3114 // same object type (or a reference to it), to a (possibly 3115 // cv-qualified) base class of that type (or a reference to it), 3116 // or to (possibly cv-qualified) void. 3117 // FIXME: Suppress this warning if the conversion function ends up being a 3118 // virtual function that overrides a virtual function in a base class. 3119 QualType ClassType 3120 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3121 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3122 ConvType = ConvTypeRef->getPointeeType(); 3123 if (ConvType->isRecordType()) { 3124 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3125 if (ConvType == ClassType) 3126 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3127 << ClassType; 3128 else if (IsDerivedFrom(ClassType, ConvType)) 3129 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3130 << ClassType << ConvType; 3131 } else if (ConvType->isVoidType()) { 3132 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3133 << ClassType << ConvType; 3134 } 3135 3136 if (Conversion->getPrimaryTemplate()) { 3137 // ignore specializations 3138 } else if (Conversion->getPreviousDeclaration()) { 3139 if (FunctionTemplateDecl *ConversionTemplate 3140 = Conversion->getDescribedFunctionTemplate()) { 3141 if (ClassDecl->replaceConversion( 3142 ConversionTemplate->getPreviousDeclaration(), 3143 ConversionTemplate)) 3144 return DeclPtrTy::make(ConversionTemplate); 3145 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3146 Conversion)) 3147 return DeclPtrTy::make(Conversion); 3148 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3149 } else if (FunctionTemplateDecl *ConversionTemplate 3150 = Conversion->getDescribedFunctionTemplate()) 3151 ClassDecl->addConversionFunction(ConversionTemplate); 3152 else 3153 ClassDecl->addConversionFunction(Conversion); 3154 3155 return DeclPtrTy::make(Conversion); 3156} 3157 3158//===----------------------------------------------------------------------===// 3159// Namespace Handling 3160//===----------------------------------------------------------------------===// 3161 3162/// ActOnStartNamespaceDef - This is called at the start of a namespace 3163/// definition. 3164Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3165 SourceLocation IdentLoc, 3166 IdentifierInfo *II, 3167 SourceLocation LBrace, 3168 AttributeList *AttrList) { 3169 NamespaceDecl *Namespc = 3170 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3171 Namespc->setLBracLoc(LBrace); 3172 3173 Scope *DeclRegionScope = NamespcScope->getParent(); 3174 3175 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3176 3177 if (II) { 3178 // C++ [namespace.def]p2: 3179 // The identifier in an original-namespace-definition shall not have been 3180 // previously defined in the declarative region in which the 3181 // original-namespace-definition appears. The identifier in an 3182 // original-namespace-definition is the name of the namespace. Subsequently 3183 // in that declarative region, it is treated as an original-namespace-name. 3184 3185 NamedDecl *PrevDecl 3186 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3187 ForRedeclaration); 3188 3189 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3190 // This is an extended namespace definition. 3191 // Attach this namespace decl to the chain of extended namespace 3192 // definitions. 3193 OrigNS->setNextNamespace(Namespc); 3194 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3195 3196 // Remove the previous declaration from the scope. 3197 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3198 IdResolver.RemoveDecl(OrigNS); 3199 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3200 } 3201 } else if (PrevDecl) { 3202 // This is an invalid name redefinition. 3203 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3204 << Namespc->getDeclName(); 3205 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3206 Namespc->setInvalidDecl(); 3207 // Continue on to push Namespc as current DeclContext and return it. 3208 } else if (II->isStr("std") && 3209 CurContext->getLookupContext()->isTranslationUnit()) { 3210 // This is the first "real" definition of the namespace "std", so update 3211 // our cache of the "std" namespace to point at this definition. 3212 if (StdNamespace) { 3213 // We had already defined a dummy namespace "std". Link this new 3214 // namespace definition to the dummy namespace "std". 3215 StdNamespace->setNextNamespace(Namespc); 3216 StdNamespace->setLocation(IdentLoc); 3217 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3218 } 3219 3220 // Make our StdNamespace cache point at the first real definition of the 3221 // "std" namespace. 3222 StdNamespace = Namespc; 3223 } 3224 3225 PushOnScopeChains(Namespc, DeclRegionScope); 3226 } else { 3227 // Anonymous namespaces. 3228 assert(Namespc->isAnonymousNamespace()); 3229 3230 // Link the anonymous namespace into its parent. 3231 NamespaceDecl *PrevDecl; 3232 DeclContext *Parent = CurContext->getLookupContext(); 3233 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3234 PrevDecl = TU->getAnonymousNamespace(); 3235 TU->setAnonymousNamespace(Namespc); 3236 } else { 3237 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3238 PrevDecl = ND->getAnonymousNamespace(); 3239 ND->setAnonymousNamespace(Namespc); 3240 } 3241 3242 // Link the anonymous namespace with its previous declaration. 3243 if (PrevDecl) { 3244 assert(PrevDecl->isAnonymousNamespace()); 3245 assert(!PrevDecl->getNextNamespace()); 3246 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3247 PrevDecl->setNextNamespace(Namespc); 3248 } 3249 3250 CurContext->addDecl(Namespc); 3251 3252 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3253 // behaves as if it were replaced by 3254 // namespace unique { /* empty body */ } 3255 // using namespace unique; 3256 // namespace unique { namespace-body } 3257 // where all occurrences of 'unique' in a translation unit are 3258 // replaced by the same identifier and this identifier differs 3259 // from all other identifiers in the entire program. 3260 3261 // We just create the namespace with an empty name and then add an 3262 // implicit using declaration, just like the standard suggests. 3263 // 3264 // CodeGen enforces the "universally unique" aspect by giving all 3265 // declarations semantically contained within an anonymous 3266 // namespace internal linkage. 3267 3268 if (!PrevDecl) { 3269 UsingDirectiveDecl* UD 3270 = UsingDirectiveDecl::Create(Context, CurContext, 3271 /* 'using' */ LBrace, 3272 /* 'namespace' */ SourceLocation(), 3273 /* qualifier */ SourceRange(), 3274 /* NNS */ NULL, 3275 /* identifier */ SourceLocation(), 3276 Namespc, 3277 /* Ancestor */ CurContext); 3278 UD->setImplicit(); 3279 CurContext->addDecl(UD); 3280 } 3281 } 3282 3283 // Although we could have an invalid decl (i.e. the namespace name is a 3284 // redefinition), push it as current DeclContext and try to continue parsing. 3285 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3286 // for the namespace has the declarations that showed up in that particular 3287 // namespace definition. 3288 PushDeclContext(NamespcScope, Namespc); 3289 return DeclPtrTy::make(Namespc); 3290} 3291 3292/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3293/// is a namespace alias, returns the namespace it points to. 3294static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3295 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3296 return AD->getNamespace(); 3297 return dyn_cast_or_null<NamespaceDecl>(D); 3298} 3299 3300/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3301/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3302void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3303 Decl *Dcl = D.getAs<Decl>(); 3304 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3305 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3306 Namespc->setRBracLoc(RBrace); 3307 PopDeclContext(); 3308} 3309 3310Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3311 SourceLocation UsingLoc, 3312 SourceLocation NamespcLoc, 3313 CXXScopeSpec &SS, 3314 SourceLocation IdentLoc, 3315 IdentifierInfo *NamespcName, 3316 AttributeList *AttrList) { 3317 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3318 assert(NamespcName && "Invalid NamespcName."); 3319 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3320 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3321 3322 UsingDirectiveDecl *UDir = 0; 3323 3324 // Lookup namespace name. 3325 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3326 LookupParsedName(R, S, &SS); 3327 if (R.isAmbiguous()) 3328 return DeclPtrTy(); 3329 3330 if (!R.empty()) { 3331 NamedDecl *Named = R.getFoundDecl(); 3332 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3333 && "expected namespace decl"); 3334 // C++ [namespace.udir]p1: 3335 // A using-directive specifies that the names in the nominated 3336 // namespace can be used in the scope in which the 3337 // using-directive appears after the using-directive. During 3338 // unqualified name lookup (3.4.1), the names appear as if they 3339 // were declared in the nearest enclosing namespace which 3340 // contains both the using-directive and the nominated 3341 // namespace. [Note: in this context, "contains" means "contains 3342 // directly or indirectly". ] 3343 3344 // Find enclosing context containing both using-directive and 3345 // nominated namespace. 3346 NamespaceDecl *NS = getNamespaceDecl(Named); 3347 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3348 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3349 CommonAncestor = CommonAncestor->getParent(); 3350 3351 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3352 SS.getRange(), 3353 (NestedNameSpecifier *)SS.getScopeRep(), 3354 IdentLoc, Named, CommonAncestor); 3355 PushUsingDirective(S, UDir); 3356 } else { 3357 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3358 } 3359 3360 // FIXME: We ignore attributes for now. 3361 delete AttrList; 3362 return DeclPtrTy::make(UDir); 3363} 3364 3365void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3366 // If scope has associated entity, then using directive is at namespace 3367 // or translation unit scope. We add UsingDirectiveDecls, into 3368 // it's lookup structure. 3369 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3370 Ctx->addDecl(UDir); 3371 else 3372 // Otherwise it is block-sope. using-directives will affect lookup 3373 // only to the end of scope. 3374 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3375} 3376 3377 3378Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3379 AccessSpecifier AS, 3380 bool HasUsingKeyword, 3381 SourceLocation UsingLoc, 3382 CXXScopeSpec &SS, 3383 UnqualifiedId &Name, 3384 AttributeList *AttrList, 3385 bool IsTypeName, 3386 SourceLocation TypenameLoc) { 3387 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3388 3389 switch (Name.getKind()) { 3390 case UnqualifiedId::IK_Identifier: 3391 case UnqualifiedId::IK_OperatorFunctionId: 3392 case UnqualifiedId::IK_LiteralOperatorId: 3393 case UnqualifiedId::IK_ConversionFunctionId: 3394 break; 3395 3396 case UnqualifiedId::IK_ConstructorName: 3397 case UnqualifiedId::IK_ConstructorTemplateId: 3398 // C++0x inherited constructors. 3399 if (getLangOptions().CPlusPlus0x) break; 3400 3401 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3402 << SS.getRange(); 3403 return DeclPtrTy(); 3404 3405 case UnqualifiedId::IK_DestructorName: 3406 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3407 << SS.getRange(); 3408 return DeclPtrTy(); 3409 3410 case UnqualifiedId::IK_TemplateId: 3411 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3412 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3413 return DeclPtrTy(); 3414 } 3415 3416 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3417 if (!TargetName) 3418 return DeclPtrTy(); 3419 3420 // Warn about using declarations. 3421 // TODO: store that the declaration was written without 'using' and 3422 // talk about access decls instead of using decls in the 3423 // diagnostics. 3424 if (!HasUsingKeyword) { 3425 UsingLoc = Name.getSourceRange().getBegin(); 3426 3427 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3428 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3429 } 3430 3431 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3432 Name.getSourceRange().getBegin(), 3433 TargetName, AttrList, 3434 /* IsInstantiation */ false, 3435 IsTypeName, TypenameLoc); 3436 if (UD) 3437 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3438 3439 return DeclPtrTy::make(UD); 3440} 3441 3442/// Determines whether to create a using shadow decl for a particular 3443/// decl, given the set of decls existing prior to this using lookup. 3444bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3445 const LookupResult &Previous) { 3446 // Diagnose finding a decl which is not from a base class of the 3447 // current class. We do this now because there are cases where this 3448 // function will silently decide not to build a shadow decl, which 3449 // will pre-empt further diagnostics. 3450 // 3451 // We don't need to do this in C++0x because we do the check once on 3452 // the qualifier. 3453 // 3454 // FIXME: diagnose the following if we care enough: 3455 // struct A { int foo; }; 3456 // struct B : A { using A::foo; }; 3457 // template <class T> struct C : A {}; 3458 // template <class T> struct D : C<T> { using B::foo; } // <--- 3459 // This is invalid (during instantiation) in C++03 because B::foo 3460 // resolves to the using decl in B, which is not a base class of D<T>. 3461 // We can't diagnose it immediately because C<T> is an unknown 3462 // specialization. The UsingShadowDecl in D<T> then points directly 3463 // to A::foo, which will look well-formed when we instantiate. 3464 // The right solution is to not collapse the shadow-decl chain. 3465 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3466 DeclContext *OrigDC = Orig->getDeclContext(); 3467 3468 // Handle enums and anonymous structs. 3469 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3470 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3471 while (OrigRec->isAnonymousStructOrUnion()) 3472 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3473 3474 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3475 if (OrigDC == CurContext) { 3476 Diag(Using->getLocation(), 3477 diag::err_using_decl_nested_name_specifier_is_current_class) 3478 << Using->getNestedNameRange(); 3479 Diag(Orig->getLocation(), diag::note_using_decl_target); 3480 return true; 3481 } 3482 3483 Diag(Using->getNestedNameRange().getBegin(), 3484 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3485 << Using->getTargetNestedNameDecl() 3486 << cast<CXXRecordDecl>(CurContext) 3487 << Using->getNestedNameRange(); 3488 Diag(Orig->getLocation(), diag::note_using_decl_target); 3489 return true; 3490 } 3491 } 3492 3493 if (Previous.empty()) return false; 3494 3495 NamedDecl *Target = Orig; 3496 if (isa<UsingShadowDecl>(Target)) 3497 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3498 3499 // If the target happens to be one of the previous declarations, we 3500 // don't have a conflict. 3501 // 3502 // FIXME: but we might be increasing its access, in which case we 3503 // should redeclare it. 3504 NamedDecl *NonTag = 0, *Tag = 0; 3505 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3506 I != E; ++I) { 3507 NamedDecl *D = (*I)->getUnderlyingDecl(); 3508 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3509 return false; 3510 3511 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3512 } 3513 3514 if (Target->isFunctionOrFunctionTemplate()) { 3515 FunctionDecl *FD; 3516 if (isa<FunctionTemplateDecl>(Target)) 3517 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3518 else 3519 FD = cast<FunctionDecl>(Target); 3520 3521 NamedDecl *OldDecl = 0; 3522 switch (CheckOverload(FD, Previous, OldDecl)) { 3523 case Ovl_Overload: 3524 return false; 3525 3526 case Ovl_NonFunction: 3527 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3528 break; 3529 3530 // We found a decl with the exact signature. 3531 case Ovl_Match: 3532 if (isa<UsingShadowDecl>(OldDecl)) { 3533 // Silently ignore the possible conflict. 3534 return false; 3535 } 3536 3537 // If we're in a record, we want to hide the target, so we 3538 // return true (without a diagnostic) to tell the caller not to 3539 // build a shadow decl. 3540 if (CurContext->isRecord()) 3541 return true; 3542 3543 // If we're not in a record, this is an error. 3544 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3545 break; 3546 } 3547 3548 Diag(Target->getLocation(), diag::note_using_decl_target); 3549 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3550 return true; 3551 } 3552 3553 // Target is not a function. 3554 3555 if (isa<TagDecl>(Target)) { 3556 // No conflict between a tag and a non-tag. 3557 if (!Tag) return false; 3558 3559 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3560 Diag(Target->getLocation(), diag::note_using_decl_target); 3561 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3562 return true; 3563 } 3564 3565 // No conflict between a tag and a non-tag. 3566 if (!NonTag) return false; 3567 3568 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3569 Diag(Target->getLocation(), diag::note_using_decl_target); 3570 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3571 return true; 3572} 3573 3574/// Builds a shadow declaration corresponding to a 'using' declaration. 3575UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3576 UsingDecl *UD, 3577 NamedDecl *Orig) { 3578 3579 // If we resolved to another shadow declaration, just coalesce them. 3580 NamedDecl *Target = Orig; 3581 if (isa<UsingShadowDecl>(Target)) { 3582 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3583 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3584 } 3585 3586 UsingShadowDecl *Shadow 3587 = UsingShadowDecl::Create(Context, CurContext, 3588 UD->getLocation(), UD, Target); 3589 UD->addShadowDecl(Shadow); 3590 3591 if (S) 3592 PushOnScopeChains(Shadow, S); 3593 else 3594 CurContext->addDecl(Shadow); 3595 Shadow->setAccess(UD->getAccess()); 3596 3597 // Register it as a conversion if appropriate. 3598 if (Shadow->getDeclName().getNameKind() 3599 == DeclarationName::CXXConversionFunctionName) 3600 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3601 3602 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3603 Shadow->setInvalidDecl(); 3604 3605 return Shadow; 3606} 3607 3608/// Hides a using shadow declaration. This is required by the current 3609/// using-decl implementation when a resolvable using declaration in a 3610/// class is followed by a declaration which would hide or override 3611/// one or more of the using decl's targets; for example: 3612/// 3613/// struct Base { void foo(int); }; 3614/// struct Derived : Base { 3615/// using Base::foo; 3616/// void foo(int); 3617/// }; 3618/// 3619/// The governing language is C++03 [namespace.udecl]p12: 3620/// 3621/// When a using-declaration brings names from a base class into a 3622/// derived class scope, member functions in the derived class 3623/// override and/or hide member functions with the same name and 3624/// parameter types in a base class (rather than conflicting). 3625/// 3626/// There are two ways to implement this: 3627/// (1) optimistically create shadow decls when they're not hidden 3628/// by existing declarations, or 3629/// (2) don't create any shadow decls (or at least don't make them 3630/// visible) until we've fully parsed/instantiated the class. 3631/// The problem with (1) is that we might have to retroactively remove 3632/// a shadow decl, which requires several O(n) operations because the 3633/// decl structures are (very reasonably) not designed for removal. 3634/// (2) avoids this but is very fiddly and phase-dependent. 3635void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3636 if (Shadow->getDeclName().getNameKind() == 3637 DeclarationName::CXXConversionFunctionName) 3638 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3639 3640 // Remove it from the DeclContext... 3641 Shadow->getDeclContext()->removeDecl(Shadow); 3642 3643 // ...and the scope, if applicable... 3644 if (S) { 3645 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3646 IdResolver.RemoveDecl(Shadow); 3647 } 3648 3649 // ...and the using decl. 3650 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3651 3652 // TODO: complain somehow if Shadow was used. It shouldn't 3653 // be possible for this to happen, because...? 3654} 3655 3656/// Builds a using declaration. 3657/// 3658/// \param IsInstantiation - Whether this call arises from an 3659/// instantiation of an unresolved using declaration. We treat 3660/// the lookup differently for these declarations. 3661NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3662 SourceLocation UsingLoc, 3663 CXXScopeSpec &SS, 3664 SourceLocation IdentLoc, 3665 DeclarationName Name, 3666 AttributeList *AttrList, 3667 bool IsInstantiation, 3668 bool IsTypeName, 3669 SourceLocation TypenameLoc) { 3670 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3671 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3672 3673 // FIXME: We ignore attributes for now. 3674 delete AttrList; 3675 3676 if (SS.isEmpty()) { 3677 Diag(IdentLoc, diag::err_using_requires_qualname); 3678 return 0; 3679 } 3680 3681 // Do the redeclaration lookup in the current scope. 3682 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3683 ForRedeclaration); 3684 Previous.setHideTags(false); 3685 if (S) { 3686 LookupName(Previous, S); 3687 3688 // It is really dumb that we have to do this. 3689 LookupResult::Filter F = Previous.makeFilter(); 3690 while (F.hasNext()) { 3691 NamedDecl *D = F.next(); 3692 if (!isDeclInScope(D, CurContext, S)) 3693 F.erase(); 3694 } 3695 F.done(); 3696 } else { 3697 assert(IsInstantiation && "no scope in non-instantiation"); 3698 assert(CurContext->isRecord() && "scope not record in instantiation"); 3699 LookupQualifiedName(Previous, CurContext); 3700 } 3701 3702 NestedNameSpecifier *NNS = 3703 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3704 3705 // Check for invalid redeclarations. 3706 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3707 return 0; 3708 3709 // Check for bad qualifiers. 3710 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3711 return 0; 3712 3713 DeclContext *LookupContext = computeDeclContext(SS); 3714 NamedDecl *D; 3715 if (!LookupContext) { 3716 if (IsTypeName) { 3717 // FIXME: not all declaration name kinds are legal here 3718 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3719 UsingLoc, TypenameLoc, 3720 SS.getRange(), NNS, 3721 IdentLoc, Name); 3722 } else { 3723 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3724 UsingLoc, SS.getRange(), NNS, 3725 IdentLoc, Name); 3726 } 3727 } else { 3728 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3729 SS.getRange(), UsingLoc, NNS, Name, 3730 IsTypeName); 3731 } 3732 D->setAccess(AS); 3733 CurContext->addDecl(D); 3734 3735 if (!LookupContext) return D; 3736 UsingDecl *UD = cast<UsingDecl>(D); 3737 3738 if (RequireCompleteDeclContext(SS, LookupContext)) { 3739 UD->setInvalidDecl(); 3740 return UD; 3741 } 3742 3743 // Look up the target name. 3744 3745 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3746 3747 // Unlike most lookups, we don't always want to hide tag 3748 // declarations: tag names are visible through the using declaration 3749 // even if hidden by ordinary names, *except* in a dependent context 3750 // where it's important for the sanity of two-phase lookup. 3751 if (!IsInstantiation) 3752 R.setHideTags(false); 3753 3754 LookupQualifiedName(R, LookupContext); 3755 3756 if (R.empty()) { 3757 Diag(IdentLoc, diag::err_no_member) 3758 << Name << LookupContext << SS.getRange(); 3759 UD->setInvalidDecl(); 3760 return UD; 3761 } 3762 3763 if (R.isAmbiguous()) { 3764 UD->setInvalidDecl(); 3765 return UD; 3766 } 3767 3768 if (IsTypeName) { 3769 // If we asked for a typename and got a non-type decl, error out. 3770 if (!R.getAsSingle<TypeDecl>()) { 3771 Diag(IdentLoc, diag::err_using_typename_non_type); 3772 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3773 Diag((*I)->getUnderlyingDecl()->getLocation(), 3774 diag::note_using_decl_target); 3775 UD->setInvalidDecl(); 3776 return UD; 3777 } 3778 } else { 3779 // If we asked for a non-typename and we got a type, error out, 3780 // but only if this is an instantiation of an unresolved using 3781 // decl. Otherwise just silently find the type name. 3782 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3783 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3784 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3785 UD->setInvalidDecl(); 3786 return UD; 3787 } 3788 } 3789 3790 // C++0x N2914 [namespace.udecl]p6: 3791 // A using-declaration shall not name a namespace. 3792 if (R.getAsSingle<NamespaceDecl>()) { 3793 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3794 << SS.getRange(); 3795 UD->setInvalidDecl(); 3796 return UD; 3797 } 3798 3799 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3800 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3801 BuildUsingShadowDecl(S, UD, *I); 3802 } 3803 3804 return UD; 3805} 3806 3807/// Checks that the given using declaration is not an invalid 3808/// redeclaration. Note that this is checking only for the using decl 3809/// itself, not for any ill-formedness among the UsingShadowDecls. 3810bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3811 bool isTypeName, 3812 const CXXScopeSpec &SS, 3813 SourceLocation NameLoc, 3814 const LookupResult &Prev) { 3815 // C++03 [namespace.udecl]p8: 3816 // C++0x [namespace.udecl]p10: 3817 // A using-declaration is a declaration and can therefore be used 3818 // repeatedly where (and only where) multiple declarations are 3819 // allowed. 3820 // That's only in file contexts. 3821 if (CurContext->getLookupContext()->isFileContext()) 3822 return false; 3823 3824 NestedNameSpecifier *Qual 3825 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3826 3827 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3828 NamedDecl *D = *I; 3829 3830 bool DTypename; 3831 NestedNameSpecifier *DQual; 3832 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3833 DTypename = UD->isTypeName(); 3834 DQual = UD->getTargetNestedNameDecl(); 3835 } else if (UnresolvedUsingValueDecl *UD 3836 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3837 DTypename = false; 3838 DQual = UD->getTargetNestedNameSpecifier(); 3839 } else if (UnresolvedUsingTypenameDecl *UD 3840 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3841 DTypename = true; 3842 DQual = UD->getTargetNestedNameSpecifier(); 3843 } else continue; 3844 3845 // using decls differ if one says 'typename' and the other doesn't. 3846 // FIXME: non-dependent using decls? 3847 if (isTypeName != DTypename) continue; 3848 3849 // using decls differ if they name different scopes (but note that 3850 // template instantiation can cause this check to trigger when it 3851 // didn't before instantiation). 3852 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3853 Context.getCanonicalNestedNameSpecifier(DQual)) 3854 continue; 3855 3856 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3857 Diag(D->getLocation(), diag::note_using_decl) << 1; 3858 return true; 3859 } 3860 3861 return false; 3862} 3863 3864 3865/// Checks that the given nested-name qualifier used in a using decl 3866/// in the current context is appropriately related to the current 3867/// scope. If an error is found, diagnoses it and returns true. 3868bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3869 const CXXScopeSpec &SS, 3870 SourceLocation NameLoc) { 3871 DeclContext *NamedContext = computeDeclContext(SS); 3872 3873 if (!CurContext->isRecord()) { 3874 // C++03 [namespace.udecl]p3: 3875 // C++0x [namespace.udecl]p8: 3876 // A using-declaration for a class member shall be a member-declaration. 3877 3878 // If we weren't able to compute a valid scope, it must be a 3879 // dependent class scope. 3880 if (!NamedContext || NamedContext->isRecord()) { 3881 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3882 << SS.getRange(); 3883 return true; 3884 } 3885 3886 // Otherwise, everything is known to be fine. 3887 return false; 3888 } 3889 3890 // The current scope is a record. 3891 3892 // If the named context is dependent, we can't decide much. 3893 if (!NamedContext) { 3894 // FIXME: in C++0x, we can diagnose if we can prove that the 3895 // nested-name-specifier does not refer to a base class, which is 3896 // still possible in some cases. 3897 3898 // Otherwise we have to conservatively report that things might be 3899 // okay. 3900 return false; 3901 } 3902 3903 if (!NamedContext->isRecord()) { 3904 // Ideally this would point at the last name in the specifier, 3905 // but we don't have that level of source info. 3906 Diag(SS.getRange().getBegin(), 3907 diag::err_using_decl_nested_name_specifier_is_not_class) 3908 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3909 return true; 3910 } 3911 3912 if (getLangOptions().CPlusPlus0x) { 3913 // C++0x [namespace.udecl]p3: 3914 // In a using-declaration used as a member-declaration, the 3915 // nested-name-specifier shall name a base class of the class 3916 // being defined. 3917 3918 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3919 cast<CXXRecordDecl>(NamedContext))) { 3920 if (CurContext == NamedContext) { 3921 Diag(NameLoc, 3922 diag::err_using_decl_nested_name_specifier_is_current_class) 3923 << SS.getRange(); 3924 return true; 3925 } 3926 3927 Diag(SS.getRange().getBegin(), 3928 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3929 << (NestedNameSpecifier*) SS.getScopeRep() 3930 << cast<CXXRecordDecl>(CurContext) 3931 << SS.getRange(); 3932 return true; 3933 } 3934 3935 return false; 3936 } 3937 3938 // C++03 [namespace.udecl]p4: 3939 // A using-declaration used as a member-declaration shall refer 3940 // to a member of a base class of the class being defined [etc.]. 3941 3942 // Salient point: SS doesn't have to name a base class as long as 3943 // lookup only finds members from base classes. Therefore we can 3944 // diagnose here only if we can prove that that can't happen, 3945 // i.e. if the class hierarchies provably don't intersect. 3946 3947 // TODO: it would be nice if "definitely valid" results were cached 3948 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3949 // need to be repeated. 3950 3951 struct UserData { 3952 llvm::DenseSet<const CXXRecordDecl*> Bases; 3953 3954 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3955 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3956 Data->Bases.insert(Base); 3957 return true; 3958 } 3959 3960 bool hasDependentBases(const CXXRecordDecl *Class) { 3961 return !Class->forallBases(collect, this); 3962 } 3963 3964 /// Returns true if the base is dependent or is one of the 3965 /// accumulated base classes. 3966 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3967 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3968 return !Data->Bases.count(Base); 3969 } 3970 3971 bool mightShareBases(const CXXRecordDecl *Class) { 3972 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3973 } 3974 }; 3975 3976 UserData Data; 3977 3978 // Returns false if we find a dependent base. 3979 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3980 return false; 3981 3982 // Returns false if the class has a dependent base or if it or one 3983 // of its bases is present in the base set of the current context. 3984 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3985 return false; 3986 3987 Diag(SS.getRange().getBegin(), 3988 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3989 << (NestedNameSpecifier*) SS.getScopeRep() 3990 << cast<CXXRecordDecl>(CurContext) 3991 << SS.getRange(); 3992 3993 return true; 3994} 3995 3996Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3997 SourceLocation NamespaceLoc, 3998 SourceLocation AliasLoc, 3999 IdentifierInfo *Alias, 4000 CXXScopeSpec &SS, 4001 SourceLocation IdentLoc, 4002 IdentifierInfo *Ident) { 4003 4004 // Lookup the namespace name. 4005 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4006 LookupParsedName(R, S, &SS); 4007 4008 // Check if we have a previous declaration with the same name. 4009 NamedDecl *PrevDecl 4010 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4011 ForRedeclaration); 4012 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4013 PrevDecl = 0; 4014 4015 if (PrevDecl) { 4016 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4017 // We already have an alias with the same name that points to the same 4018 // namespace, so don't create a new one. 4019 // FIXME: At some point, we'll want to create the (redundant) 4020 // declaration to maintain better source information. 4021 if (!R.isAmbiguous() && !R.empty() && 4022 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4023 return DeclPtrTy(); 4024 } 4025 4026 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4027 diag::err_redefinition_different_kind; 4028 Diag(AliasLoc, DiagID) << Alias; 4029 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4030 return DeclPtrTy(); 4031 } 4032 4033 if (R.isAmbiguous()) 4034 return DeclPtrTy(); 4035 4036 if (R.empty()) { 4037 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4038 return DeclPtrTy(); 4039 } 4040 4041 NamespaceAliasDecl *AliasDecl = 4042 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4043 Alias, SS.getRange(), 4044 (NestedNameSpecifier *)SS.getScopeRep(), 4045 IdentLoc, R.getFoundDecl()); 4046 4047 PushOnScopeChains(AliasDecl, S); 4048 return DeclPtrTy::make(AliasDecl); 4049} 4050 4051namespace { 4052 /// \brief Scoped object used to handle the state changes required in Sema 4053 /// to implicitly define the body of a C++ member function; 4054 class ImplicitlyDefinedFunctionScope { 4055 Sema &S; 4056 DeclContext *PreviousContext; 4057 4058 public: 4059 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4060 : S(S), PreviousContext(S.CurContext) 4061 { 4062 S.CurContext = Method; 4063 S.PushFunctionScope(); 4064 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4065 } 4066 4067 ~ImplicitlyDefinedFunctionScope() { 4068 S.PopExpressionEvaluationContext(); 4069 S.PopFunctionOrBlockScope(); 4070 S.CurContext = PreviousContext; 4071 } 4072 }; 4073} 4074 4075void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4076 CXXConstructorDecl *Constructor) { 4077 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4078 !Constructor->isUsed()) && 4079 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4080 4081 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4082 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4083 4084 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4085 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4086 Diag(CurrentLocation, diag::note_member_synthesized_at) 4087 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4088 Constructor->setInvalidDecl(); 4089 } else { 4090 Constructor->setUsed(); 4091 } 4092} 4093 4094void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4095 CXXDestructorDecl *Destructor) { 4096 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4097 "DefineImplicitDestructor - call it for implicit default dtor"); 4098 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4099 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4100 4101 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4102 4103 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4104 Destructor->getParent()); 4105 4106 // FIXME: If CheckDestructor fails, we should emit a note about where the 4107 // implicit destructor was needed. 4108 if (CheckDestructor(Destructor)) { 4109 Diag(CurrentLocation, diag::note_member_synthesized_at) 4110 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4111 4112 Destructor->setInvalidDecl(); 4113 return; 4114 } 4115 4116 Destructor->setUsed(); 4117} 4118 4119/// \brief Builds a statement that copies the given entity from \p From to 4120/// \c To. 4121/// 4122/// This routine is used to copy the members of a class with an 4123/// implicitly-declared copy assignment operator. When the entities being 4124/// copied are arrays, this routine builds for loops to copy them. 4125/// 4126/// \param S The Sema object used for type-checking. 4127/// 4128/// \param Loc The location where the implicit copy is being generated. 4129/// 4130/// \param T The type of the expressions being copied. Both expressions must 4131/// have this type. 4132/// 4133/// \param To The expression we are copying to. 4134/// 4135/// \param From The expression we are copying from. 4136/// 4137/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4138/// Otherwise, it's a non-static member subobject. 4139/// 4140/// \param Depth Internal parameter recording the depth of the recursion. 4141/// 4142/// \returns A statement or a loop that copies the expressions. 4143static Sema::OwningStmtResult 4144BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4145 Sema::OwningExprResult To, Sema::OwningExprResult From, 4146 bool CopyingBaseSubobject, unsigned Depth = 0) { 4147 typedef Sema::OwningStmtResult OwningStmtResult; 4148 typedef Sema::OwningExprResult OwningExprResult; 4149 4150 // C++0x [class.copy]p30: 4151 // Each subobject is assigned in the manner appropriate to its type: 4152 // 4153 // - if the subobject is of class type, the copy assignment operator 4154 // for the class is used (as if by explicit qualification; that is, 4155 // ignoring any possible virtual overriding functions in more derived 4156 // classes); 4157 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4158 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4159 4160 // Look for operator=. 4161 DeclarationName Name 4162 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4163 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4164 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4165 4166 // Filter out any result that isn't a copy-assignment operator. 4167 LookupResult::Filter F = OpLookup.makeFilter(); 4168 while (F.hasNext()) { 4169 NamedDecl *D = F.next(); 4170 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4171 if (Method->isCopyAssignmentOperator()) 4172 continue; 4173 4174 F.erase(); 4175 } 4176 F.done(); 4177 4178 // Suppress the protected check (C++ [class.protected]) for each of the 4179 // assignment operators we found. This strange dance is required when 4180 // we're assigning via a base classes's copy-assignment operator. To 4181 // ensure that we're getting the right base class subobject (without 4182 // ambiguities), we need to cast "this" to that subobject type; to 4183 // ensure that we don't go through the virtual call mechanism, we need 4184 // to qualify the operator= name with the base class (see below). However, 4185 // this means that if the base class has a protected copy assignment 4186 // operator, the protected member access check will fail. So, we 4187 // rewrite "protected" access to "public" access in this case, since we 4188 // know by construction that we're calling from a derived class. 4189 if (CopyingBaseSubobject) { 4190 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4191 L != LEnd; ++L) { 4192 if (L.getAccess() == AS_protected) 4193 L.setAccess(AS_public); 4194 } 4195 } 4196 4197 // Create the nested-name-specifier that will be used to qualify the 4198 // reference to operator=; this is required to suppress the virtual 4199 // call mechanism. 4200 CXXScopeSpec SS; 4201 SS.setRange(Loc); 4202 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4203 T.getTypePtr())); 4204 4205 // Create the reference to operator=. 4206 OwningExprResult OpEqualRef 4207 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4208 /*FirstQualifierInScope=*/0, OpLookup, 4209 /*TemplateArgs=*/0, 4210 /*SuppressQualifierCheck=*/true); 4211 if (OpEqualRef.isInvalid()) 4212 return S.StmtError(); 4213 4214 // Build the call to the assignment operator. 4215 Expr *FromE = From.takeAs<Expr>(); 4216 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4217 OpEqualRef.takeAs<Expr>(), 4218 Loc, &FromE, 1, 0, Loc); 4219 if (Call.isInvalid()) 4220 return S.StmtError(); 4221 4222 return S.Owned(Call.takeAs<Stmt>()); 4223 } 4224 4225 // - if the subobject is of scalar type, the built-in assignment 4226 // operator is used. 4227 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4228 if (!ArrayTy) { 4229 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4230 BinaryOperator::Assign, 4231 To.takeAs<Expr>(), 4232 From.takeAs<Expr>()); 4233 if (Assignment.isInvalid()) 4234 return S.StmtError(); 4235 4236 return S.Owned(Assignment.takeAs<Stmt>()); 4237 } 4238 4239 // - if the subobject is an array, each element is assigned, in the 4240 // manner appropriate to the element type; 4241 4242 // Construct a loop over the array bounds, e.g., 4243 // 4244 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4245 // 4246 // that will copy each of the array elements. 4247 QualType SizeType = S.Context.getSizeType(); 4248 4249 // Create the iteration variable. 4250 IdentifierInfo *IterationVarName = 0; 4251 { 4252 llvm::SmallString<8> Str; 4253 llvm::raw_svector_ostream OS(Str); 4254 OS << "__i" << Depth; 4255 IterationVarName = &S.Context.Idents.get(OS.str()); 4256 } 4257 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4258 IterationVarName, SizeType, 4259 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4260 VarDecl::None, VarDecl::None); 4261 4262 // Initialize the iteration variable to zero. 4263 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4264 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4265 4266 // Create a reference to the iteration variable; we'll use this several 4267 // times throughout. 4268 Expr *IterationVarRef 4269 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4270 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4271 4272 // Create the DeclStmt that holds the iteration variable. 4273 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4274 4275 // Create the comparison against the array bound. 4276 llvm::APInt Upper = ArrayTy->getSize(); 4277 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4278 OwningExprResult Comparison 4279 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4280 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4281 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4282 4283 // Create the pre-increment of the iteration variable. 4284 OwningExprResult Increment 4285 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4286 UnaryOperator::PreInc, 4287 SizeType, Loc)); 4288 4289 // Subscript the "from" and "to" expressions with the iteration variable. 4290 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4291 S.Owned(IterationVarRef->Retain()), 4292 Loc); 4293 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4294 S.Owned(IterationVarRef->Retain()), 4295 Loc); 4296 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4297 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4298 4299 // Build the copy for an individual element of the array. 4300 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4301 ArrayTy->getElementType(), 4302 move(To), move(From), 4303 CopyingBaseSubobject, Depth+1); 4304 if (Copy.isInvalid()) { 4305 InitStmt->Destroy(S.Context); 4306 return S.StmtError(); 4307 } 4308 4309 // Construct the loop that copies all elements of this array. 4310 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4311 S.MakeFullExpr(Comparison), 4312 Sema::DeclPtrTy(), 4313 S.MakeFullExpr(Increment), 4314 Loc, move(Copy)); 4315} 4316 4317void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4318 CXXMethodDecl *CopyAssignOperator) { 4319 assert((CopyAssignOperator->isImplicit() && 4320 CopyAssignOperator->isOverloadedOperator() && 4321 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4322 !CopyAssignOperator->isUsed()) && 4323 "DefineImplicitCopyAssignment called for wrong function"); 4324 4325 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4326 4327 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4328 CopyAssignOperator->setInvalidDecl(); 4329 return; 4330 } 4331 4332 CopyAssignOperator->setUsed(); 4333 4334 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4335 4336 // C++0x [class.copy]p30: 4337 // The implicitly-defined or explicitly-defaulted copy assignment operator 4338 // for a non-union class X performs memberwise copy assignment of its 4339 // subobjects. The direct base classes of X are assigned first, in the 4340 // order of their declaration in the base-specifier-list, and then the 4341 // immediate non-static data members of X are assigned, in the order in 4342 // which they were declared in the class definition. 4343 4344 // The statements that form the synthesized function body. 4345 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4346 4347 // The parameter for the "other" object, which we are copying from. 4348 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4349 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4350 QualType OtherRefType = Other->getType(); 4351 if (const LValueReferenceType *OtherRef 4352 = OtherRefType->getAs<LValueReferenceType>()) { 4353 OtherRefType = OtherRef->getPointeeType(); 4354 OtherQuals = OtherRefType.getQualifiers(); 4355 } 4356 4357 // Our location for everything implicitly-generated. 4358 SourceLocation Loc = CopyAssignOperator->getLocation(); 4359 4360 // Construct a reference to the "other" object. We'll be using this 4361 // throughout the generated ASTs. 4362 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4363 assert(OtherRef && "Reference to parameter cannot fail!"); 4364 4365 // Construct the "this" pointer. We'll be using this throughout the generated 4366 // ASTs. 4367 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4368 assert(This && "Reference to this cannot fail!"); 4369 4370 // Assign base classes. 4371 bool Invalid = false; 4372 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4373 E = ClassDecl->bases_end(); Base != E; ++Base) { 4374 // Form the assignment: 4375 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4376 QualType BaseType = Base->getType().getUnqualifiedType(); 4377 CXXRecordDecl *BaseClassDecl = 0; 4378 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4379 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4380 else { 4381 Invalid = true; 4382 continue; 4383 } 4384 4385 // Construct the "from" expression, which is an implicit cast to the 4386 // appropriately-qualified base type. 4387 Expr *From = OtherRef->Retain(); 4388 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4389 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4390 CXXBaseSpecifierArray(Base)); 4391 4392 // Dereference "this". 4393 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4394 Owned(This->Retain())); 4395 4396 // Implicitly cast "this" to the appropriately-qualified base type. 4397 Expr *ToE = To.takeAs<Expr>(); 4398 ImpCastExprToType(ToE, 4399 Context.getCVRQualifiedType(BaseType, 4400 CopyAssignOperator->getTypeQualifiers()), 4401 CastExpr::CK_UncheckedDerivedToBase, 4402 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4403 To = Owned(ToE); 4404 4405 // Build the copy. 4406 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4407 move(To), Owned(From), 4408 /*CopyingBaseSubobject=*/true); 4409 if (Copy.isInvalid()) { 4410 Invalid = true; 4411 continue; 4412 } 4413 4414 // Success! Record the copy. 4415 Statements.push_back(Copy.takeAs<Expr>()); 4416 } 4417 4418 // \brief Reference to the __builtin_memcpy function. 4419 Expr *BuiltinMemCpyRef = 0; 4420 4421 // Assign non-static members. 4422 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4423 FieldEnd = ClassDecl->field_end(); 4424 Field != FieldEnd; ++Field) { 4425 // Check for members of reference type; we can't copy those. 4426 if (Field->getType()->isReferenceType()) { 4427 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4428 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4429 Diag(Field->getLocation(), diag::note_declared_at); 4430 Diag(Loc, diag::note_first_required_here); 4431 Invalid = true; 4432 continue; 4433 } 4434 4435 // Check for members of const-qualified, non-class type. 4436 QualType BaseType = Context.getBaseElementType(Field->getType()); 4437 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4438 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4439 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4440 Diag(Field->getLocation(), diag::note_declared_at); 4441 Diag(Loc, diag::note_first_required_here); 4442 Invalid = true; 4443 continue; 4444 } 4445 4446 QualType FieldType = Field->getType().getNonReferenceType(); 4447 4448 // Build references to the field in the object we're copying from and to. 4449 CXXScopeSpec SS; // Intentionally empty 4450 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4451 LookupMemberName); 4452 MemberLookup.addDecl(*Field); 4453 MemberLookup.resolveKind(); 4454 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4455 OtherRefType, 4456 Loc, /*IsArrow=*/false, 4457 SS, 0, MemberLookup, 0); 4458 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4459 This->getType(), 4460 Loc, /*IsArrow=*/true, 4461 SS, 0, MemberLookup, 0); 4462 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4463 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4464 4465 // If the field should be copied with __builtin_memcpy rather than via 4466 // explicit assignments, do so. This optimization only applies for arrays 4467 // of scalars and arrays of class type with trivial copy-assignment 4468 // operators. 4469 if (FieldType->isArrayType() && 4470 (!BaseType->isRecordType() || 4471 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4472 ->hasTrivialCopyAssignment())) { 4473 // Compute the size of the memory buffer to be copied. 4474 QualType SizeType = Context.getSizeType(); 4475 llvm::APInt Size(Context.getTypeSize(SizeType), 4476 Context.getTypeSizeInChars(BaseType).getQuantity()); 4477 for (const ConstantArrayType *Array 4478 = Context.getAsConstantArrayType(FieldType); 4479 Array; 4480 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4481 llvm::APInt ArraySize = Array->getSize(); 4482 ArraySize.zextOrTrunc(Size.getBitWidth()); 4483 Size *= ArraySize; 4484 } 4485 4486 // Take the address of the field references for "from" and "to". 4487 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4488 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4489 4490 // Create a reference to the __builtin_memcpy builtin function. 4491 if (!BuiltinMemCpyRef) { 4492 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4493 LookupOrdinaryName); 4494 LookupName(R, TUScope, true); 4495 4496 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4497 if (!BuiltinMemCpy) { 4498 // Something went horribly wrong earlier, and we will have complained 4499 // about it. 4500 Invalid = true; 4501 continue; 4502 } 4503 4504 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4505 BuiltinMemCpy->getType(), 4506 Loc, 0).takeAs<Expr>(); 4507 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4508 } 4509 4510 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4511 CallArgs.push_back(To.takeAs<Expr>()); 4512 CallArgs.push_back(From.takeAs<Expr>()); 4513 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4514 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4515 Commas.push_back(Loc); 4516 Commas.push_back(Loc); 4517 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4518 Owned(BuiltinMemCpyRef->Retain()), 4519 Loc, move_arg(CallArgs), 4520 Commas.data(), Loc); 4521 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4522 Statements.push_back(Call.takeAs<Expr>()); 4523 continue; 4524 } 4525 4526 // Build the copy of this field. 4527 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4528 move(To), move(From), 4529 /*CopyingBaseSubobject=*/false); 4530 if (Copy.isInvalid()) { 4531 Invalid = true; 4532 continue; 4533 } 4534 4535 // Success! Record the copy. 4536 Statements.push_back(Copy.takeAs<Stmt>()); 4537 } 4538 4539 if (!Invalid) { 4540 // Add a "return *this;" 4541 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4542 Owned(This->Retain())); 4543 4544 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4545 if (Return.isInvalid()) 4546 Invalid = true; 4547 else { 4548 Statements.push_back(Return.takeAs<Stmt>()); 4549 } 4550 } 4551 4552 if (Invalid) { 4553 CopyAssignOperator->setInvalidDecl(); 4554 return; 4555 } 4556 4557 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4558 /*isStmtExpr=*/false); 4559 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4560 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4561} 4562 4563void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4564 CXXConstructorDecl *CopyConstructor, 4565 unsigned TypeQuals) { 4566 assert((CopyConstructor->isImplicit() && 4567 CopyConstructor->isCopyConstructor(TypeQuals) && 4568 !CopyConstructor->isUsed()) && 4569 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4570 4571 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4572 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4573 4574 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4575 4576 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false)) { 4577 Diag(CurrentLocation, diag::note_member_synthesized_at) 4578 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4579 CopyConstructor->setInvalidDecl(); 4580 } else { 4581 CopyConstructor->setUsed(); 4582 } 4583 4584 // FIXME: Once SetBaseOrMemberInitializers can handle copy initialization of 4585 // fields, this code below should be removed. 4586 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4587 FieldEnd = ClassDecl->field_end(); 4588 Field != FieldEnd; ++Field) { 4589 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4590 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4591 FieldType = Array->getElementType(); 4592 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4593 CXXRecordDecl *FieldClassDecl 4594 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4595 if (CXXConstructorDecl *FieldCopyCtor = 4596 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4597 CheckDirectMemberAccess(Field->getLocation(), 4598 FieldCopyCtor, 4599 PDiag(diag::err_access_copy_field) 4600 << Field->getDeclName() << Field->getType()); 4601 4602 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4603 } 4604 } 4605 } 4606} 4607 4608Sema::OwningExprResult 4609Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4610 CXXConstructorDecl *Constructor, 4611 MultiExprArg ExprArgs, 4612 bool RequiresZeroInit, 4613 CXXConstructExpr::ConstructionKind ConstructKind) { 4614 bool Elidable = false; 4615 4616 // C++0x [class.copy]p34: 4617 // When certain criteria are met, an implementation is allowed to 4618 // omit the copy/move construction of a class object, even if the 4619 // copy/move constructor and/or destructor for the object have 4620 // side effects. [...] 4621 // - when a temporary class object that has not been bound to a 4622 // reference (12.2) would be copied/moved to a class object 4623 // with the same cv-unqualified type, the copy/move operation 4624 // can be omitted by constructing the temporary object 4625 // directly into the target of the omitted copy/move 4626 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4627 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4628 Elidable = SubExpr->isTemporaryObject() && 4629 Context.hasSameUnqualifiedType(SubExpr->getType(), 4630 Context.getTypeDeclType(Constructor->getParent())); 4631 } 4632 4633 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4634 Elidable, move(ExprArgs), RequiresZeroInit, 4635 ConstructKind); 4636} 4637 4638/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4639/// including handling of its default argument expressions. 4640Sema::OwningExprResult 4641Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4642 CXXConstructorDecl *Constructor, bool Elidable, 4643 MultiExprArg ExprArgs, 4644 bool RequiresZeroInit, 4645 CXXConstructExpr::ConstructionKind ConstructKind) { 4646 unsigned NumExprs = ExprArgs.size(); 4647 Expr **Exprs = (Expr **)ExprArgs.release(); 4648 4649 MarkDeclarationReferenced(ConstructLoc, Constructor); 4650 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4651 Constructor, Elidable, Exprs, NumExprs, 4652 RequiresZeroInit, ConstructKind)); 4653} 4654 4655bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4656 CXXConstructorDecl *Constructor, 4657 MultiExprArg Exprs) { 4658 OwningExprResult TempResult = 4659 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4660 move(Exprs)); 4661 if (TempResult.isInvalid()) 4662 return true; 4663 4664 Expr *Temp = TempResult.takeAs<Expr>(); 4665 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4666 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4667 VD->setInit(Temp); 4668 4669 return false; 4670} 4671 4672void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4673 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4674 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4675 !ClassDecl->hasTrivialDestructor()) { 4676 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4677 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4678 CheckDestructorAccess(VD->getLocation(), Destructor, 4679 PDiag(diag::err_access_dtor_var) 4680 << VD->getDeclName() 4681 << VD->getType()); 4682 } 4683} 4684 4685/// AddCXXDirectInitializerToDecl - This action is called immediately after 4686/// ActOnDeclarator, when a C++ direct initializer is present. 4687/// e.g: "int x(1);" 4688void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4689 SourceLocation LParenLoc, 4690 MultiExprArg Exprs, 4691 SourceLocation *CommaLocs, 4692 SourceLocation RParenLoc) { 4693 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4694 Decl *RealDecl = Dcl.getAs<Decl>(); 4695 4696 // If there is no declaration, there was an error parsing it. Just ignore 4697 // the initializer. 4698 if (RealDecl == 0) 4699 return; 4700 4701 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4702 if (!VDecl) { 4703 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4704 RealDecl->setInvalidDecl(); 4705 return; 4706 } 4707 4708 // We will represent direct-initialization similarly to copy-initialization: 4709 // int x(1); -as-> int x = 1; 4710 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4711 // 4712 // Clients that want to distinguish between the two forms, can check for 4713 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4714 // A major benefit is that clients that don't particularly care about which 4715 // exactly form was it (like the CodeGen) can handle both cases without 4716 // special case code. 4717 4718 // C++ 8.5p11: 4719 // The form of initialization (using parentheses or '=') is generally 4720 // insignificant, but does matter when the entity being initialized has a 4721 // class type. 4722 QualType DeclInitType = VDecl->getType(); 4723 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4724 DeclInitType = Context.getBaseElementType(Array); 4725 4726 if (!VDecl->getType()->isDependentType() && 4727 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4728 diag::err_typecheck_decl_incomplete_type)) { 4729 VDecl->setInvalidDecl(); 4730 return; 4731 } 4732 4733 // The variable can not have an abstract class type. 4734 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4735 diag::err_abstract_type_in_decl, 4736 AbstractVariableType)) 4737 VDecl->setInvalidDecl(); 4738 4739 const VarDecl *Def; 4740 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4741 Diag(VDecl->getLocation(), diag::err_redefinition) 4742 << VDecl->getDeclName(); 4743 Diag(Def->getLocation(), diag::note_previous_definition); 4744 VDecl->setInvalidDecl(); 4745 return; 4746 } 4747 4748 // If either the declaration has a dependent type or if any of the 4749 // expressions is type-dependent, we represent the initialization 4750 // via a ParenListExpr for later use during template instantiation. 4751 if (VDecl->getType()->isDependentType() || 4752 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4753 // Let clients know that initialization was done with a direct initializer. 4754 VDecl->setCXXDirectInitializer(true); 4755 4756 // Store the initialization expressions as a ParenListExpr. 4757 unsigned NumExprs = Exprs.size(); 4758 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4759 (Expr **)Exprs.release(), 4760 NumExprs, RParenLoc)); 4761 return; 4762 } 4763 4764 // Capture the variable that is being initialized and the style of 4765 // initialization. 4766 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4767 4768 // FIXME: Poor source location information. 4769 InitializationKind Kind 4770 = InitializationKind::CreateDirect(VDecl->getLocation(), 4771 LParenLoc, RParenLoc); 4772 4773 InitializationSequence InitSeq(*this, Entity, Kind, 4774 (Expr**)Exprs.get(), Exprs.size()); 4775 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4776 if (Result.isInvalid()) { 4777 VDecl->setInvalidDecl(); 4778 return; 4779 } 4780 4781 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4782 VDecl->setInit(Result.takeAs<Expr>()); 4783 VDecl->setCXXDirectInitializer(true); 4784 4785 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4786 FinalizeVarWithDestructor(VDecl, Record); 4787} 4788 4789/// \brief Given a constructor and the set of arguments provided for the 4790/// constructor, convert the arguments and add any required default arguments 4791/// to form a proper call to this constructor. 4792/// 4793/// \returns true if an error occurred, false otherwise. 4794bool 4795Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4796 MultiExprArg ArgsPtr, 4797 SourceLocation Loc, 4798 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4799 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4800 unsigned NumArgs = ArgsPtr.size(); 4801 Expr **Args = (Expr **)ArgsPtr.get(); 4802 4803 const FunctionProtoType *Proto 4804 = Constructor->getType()->getAs<FunctionProtoType>(); 4805 assert(Proto && "Constructor without a prototype?"); 4806 unsigned NumArgsInProto = Proto->getNumArgs(); 4807 4808 // If too few arguments are available, we'll fill in the rest with defaults. 4809 if (NumArgs < NumArgsInProto) 4810 ConvertedArgs.reserve(NumArgsInProto); 4811 else 4812 ConvertedArgs.reserve(NumArgs); 4813 4814 VariadicCallType CallType = 4815 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4816 llvm::SmallVector<Expr *, 8> AllArgs; 4817 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4818 Proto, 0, Args, NumArgs, AllArgs, 4819 CallType); 4820 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4821 ConvertedArgs.push_back(AllArgs[i]); 4822 return Invalid; 4823} 4824 4825static inline bool 4826CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4827 const FunctionDecl *FnDecl) { 4828 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4829 if (isa<NamespaceDecl>(DC)) { 4830 return SemaRef.Diag(FnDecl->getLocation(), 4831 diag::err_operator_new_delete_declared_in_namespace) 4832 << FnDecl->getDeclName(); 4833 } 4834 4835 if (isa<TranslationUnitDecl>(DC) && 4836 FnDecl->getStorageClass() == FunctionDecl::Static) { 4837 return SemaRef.Diag(FnDecl->getLocation(), 4838 diag::err_operator_new_delete_declared_static) 4839 << FnDecl->getDeclName(); 4840 } 4841 4842 return false; 4843} 4844 4845static inline bool 4846CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4847 CanQualType ExpectedResultType, 4848 CanQualType ExpectedFirstParamType, 4849 unsigned DependentParamTypeDiag, 4850 unsigned InvalidParamTypeDiag) { 4851 QualType ResultType = 4852 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4853 4854 // Check that the result type is not dependent. 4855 if (ResultType->isDependentType()) 4856 return SemaRef.Diag(FnDecl->getLocation(), 4857 diag::err_operator_new_delete_dependent_result_type) 4858 << FnDecl->getDeclName() << ExpectedResultType; 4859 4860 // Check that the result type is what we expect. 4861 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4862 return SemaRef.Diag(FnDecl->getLocation(), 4863 diag::err_operator_new_delete_invalid_result_type) 4864 << FnDecl->getDeclName() << ExpectedResultType; 4865 4866 // A function template must have at least 2 parameters. 4867 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4868 return SemaRef.Diag(FnDecl->getLocation(), 4869 diag::err_operator_new_delete_template_too_few_parameters) 4870 << FnDecl->getDeclName(); 4871 4872 // The function decl must have at least 1 parameter. 4873 if (FnDecl->getNumParams() == 0) 4874 return SemaRef.Diag(FnDecl->getLocation(), 4875 diag::err_operator_new_delete_too_few_parameters) 4876 << FnDecl->getDeclName(); 4877 4878 // Check the the first parameter type is not dependent. 4879 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4880 if (FirstParamType->isDependentType()) 4881 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4882 << FnDecl->getDeclName() << ExpectedFirstParamType; 4883 4884 // Check that the first parameter type is what we expect. 4885 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4886 ExpectedFirstParamType) 4887 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4888 << FnDecl->getDeclName() << ExpectedFirstParamType; 4889 4890 return false; 4891} 4892 4893static bool 4894CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4895 // C++ [basic.stc.dynamic.allocation]p1: 4896 // A program is ill-formed if an allocation function is declared in a 4897 // namespace scope other than global scope or declared static in global 4898 // scope. 4899 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4900 return true; 4901 4902 CanQualType SizeTy = 4903 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4904 4905 // C++ [basic.stc.dynamic.allocation]p1: 4906 // The return type shall be void*. The first parameter shall have type 4907 // std::size_t. 4908 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4909 SizeTy, 4910 diag::err_operator_new_dependent_param_type, 4911 diag::err_operator_new_param_type)) 4912 return true; 4913 4914 // C++ [basic.stc.dynamic.allocation]p1: 4915 // The first parameter shall not have an associated default argument. 4916 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4917 return SemaRef.Diag(FnDecl->getLocation(), 4918 diag::err_operator_new_default_arg) 4919 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4920 4921 return false; 4922} 4923 4924static bool 4925CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4926 // C++ [basic.stc.dynamic.deallocation]p1: 4927 // A program is ill-formed if deallocation functions are declared in a 4928 // namespace scope other than global scope or declared static in global 4929 // scope. 4930 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4931 return true; 4932 4933 // C++ [basic.stc.dynamic.deallocation]p2: 4934 // Each deallocation function shall return void and its first parameter 4935 // shall be void*. 4936 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4937 SemaRef.Context.VoidPtrTy, 4938 diag::err_operator_delete_dependent_param_type, 4939 diag::err_operator_delete_param_type)) 4940 return true; 4941 4942 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4943 if (FirstParamType->isDependentType()) 4944 return SemaRef.Diag(FnDecl->getLocation(), 4945 diag::err_operator_delete_dependent_param_type) 4946 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4947 4948 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4949 SemaRef.Context.VoidPtrTy) 4950 return SemaRef.Diag(FnDecl->getLocation(), 4951 diag::err_operator_delete_param_type) 4952 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4953 4954 return false; 4955} 4956 4957/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4958/// of this overloaded operator is well-formed. If so, returns false; 4959/// otherwise, emits appropriate diagnostics and returns true. 4960bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4961 assert(FnDecl && FnDecl->isOverloadedOperator() && 4962 "Expected an overloaded operator declaration"); 4963 4964 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4965 4966 // C++ [over.oper]p5: 4967 // The allocation and deallocation functions, operator new, 4968 // operator new[], operator delete and operator delete[], are 4969 // described completely in 3.7.3. The attributes and restrictions 4970 // found in the rest of this subclause do not apply to them unless 4971 // explicitly stated in 3.7.3. 4972 if (Op == OO_Delete || Op == OO_Array_Delete) 4973 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4974 4975 if (Op == OO_New || Op == OO_Array_New) 4976 return CheckOperatorNewDeclaration(*this, FnDecl); 4977 4978 // C++ [over.oper]p6: 4979 // An operator function shall either be a non-static member 4980 // function or be a non-member function and have at least one 4981 // parameter whose type is a class, a reference to a class, an 4982 // enumeration, or a reference to an enumeration. 4983 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4984 if (MethodDecl->isStatic()) 4985 return Diag(FnDecl->getLocation(), 4986 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4987 } else { 4988 bool ClassOrEnumParam = false; 4989 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4990 ParamEnd = FnDecl->param_end(); 4991 Param != ParamEnd; ++Param) { 4992 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4993 if (ParamType->isDependentType() || ParamType->isRecordType() || 4994 ParamType->isEnumeralType()) { 4995 ClassOrEnumParam = true; 4996 break; 4997 } 4998 } 4999 5000 if (!ClassOrEnumParam) 5001 return Diag(FnDecl->getLocation(), 5002 diag::err_operator_overload_needs_class_or_enum) 5003 << FnDecl->getDeclName(); 5004 } 5005 5006 // C++ [over.oper]p8: 5007 // An operator function cannot have default arguments (8.3.6), 5008 // except where explicitly stated below. 5009 // 5010 // Only the function-call operator allows default arguments 5011 // (C++ [over.call]p1). 5012 if (Op != OO_Call) { 5013 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5014 Param != FnDecl->param_end(); ++Param) { 5015 if ((*Param)->hasDefaultArg()) 5016 return Diag((*Param)->getLocation(), 5017 diag::err_operator_overload_default_arg) 5018 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5019 } 5020 } 5021 5022 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5023 { false, false, false } 5024#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5025 , { Unary, Binary, MemberOnly } 5026#include "clang/Basic/OperatorKinds.def" 5027 }; 5028 5029 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5030 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5031 bool MustBeMemberOperator = OperatorUses[Op][2]; 5032 5033 // C++ [over.oper]p8: 5034 // [...] Operator functions cannot have more or fewer parameters 5035 // than the number required for the corresponding operator, as 5036 // described in the rest of this subclause. 5037 unsigned NumParams = FnDecl->getNumParams() 5038 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5039 if (Op != OO_Call && 5040 ((NumParams == 1 && !CanBeUnaryOperator) || 5041 (NumParams == 2 && !CanBeBinaryOperator) || 5042 (NumParams < 1) || (NumParams > 2))) { 5043 // We have the wrong number of parameters. 5044 unsigned ErrorKind; 5045 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5046 ErrorKind = 2; // 2 -> unary or binary. 5047 } else if (CanBeUnaryOperator) { 5048 ErrorKind = 0; // 0 -> unary 5049 } else { 5050 assert(CanBeBinaryOperator && 5051 "All non-call overloaded operators are unary or binary!"); 5052 ErrorKind = 1; // 1 -> binary 5053 } 5054 5055 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5056 << FnDecl->getDeclName() << NumParams << ErrorKind; 5057 } 5058 5059 // Overloaded operators other than operator() cannot be variadic. 5060 if (Op != OO_Call && 5061 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5062 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5063 << FnDecl->getDeclName(); 5064 } 5065 5066 // Some operators must be non-static member functions. 5067 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5068 return Diag(FnDecl->getLocation(), 5069 diag::err_operator_overload_must_be_member) 5070 << FnDecl->getDeclName(); 5071 } 5072 5073 // C++ [over.inc]p1: 5074 // The user-defined function called operator++ implements the 5075 // prefix and postfix ++ operator. If this function is a member 5076 // function with no parameters, or a non-member function with one 5077 // parameter of class or enumeration type, it defines the prefix 5078 // increment operator ++ for objects of that type. If the function 5079 // is a member function with one parameter (which shall be of type 5080 // int) or a non-member function with two parameters (the second 5081 // of which shall be of type int), it defines the postfix 5082 // increment operator ++ for objects of that type. 5083 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5084 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5085 bool ParamIsInt = false; 5086 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5087 ParamIsInt = BT->getKind() == BuiltinType::Int; 5088 5089 if (!ParamIsInt) 5090 return Diag(LastParam->getLocation(), 5091 diag::err_operator_overload_post_incdec_must_be_int) 5092 << LastParam->getType() << (Op == OO_MinusMinus); 5093 } 5094 5095 // Notify the class if it got an assignment operator. 5096 if (Op == OO_Equal) { 5097 // Would have returned earlier otherwise. 5098 assert(isa<CXXMethodDecl>(FnDecl) && 5099 "Overloaded = not member, but not filtered."); 5100 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5101 Method->getParent()->addedAssignmentOperator(Context, Method); 5102 } 5103 5104 return false; 5105} 5106 5107/// CheckLiteralOperatorDeclaration - Check whether the declaration 5108/// of this literal operator function is well-formed. If so, returns 5109/// false; otherwise, emits appropriate diagnostics and returns true. 5110bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5111 DeclContext *DC = FnDecl->getDeclContext(); 5112 Decl::Kind Kind = DC->getDeclKind(); 5113 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5114 Kind != Decl::LinkageSpec) { 5115 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5116 << FnDecl->getDeclName(); 5117 return true; 5118 } 5119 5120 bool Valid = false; 5121 5122 // template <char...> type operator "" name() is the only valid template 5123 // signature, and the only valid signature with no parameters. 5124 if (FnDecl->param_size() == 0) { 5125 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5126 // Must have only one template parameter 5127 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5128 if (Params->size() == 1) { 5129 NonTypeTemplateParmDecl *PmDecl = 5130 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5131 5132 // The template parameter must be a char parameter pack. 5133 // FIXME: This test will always fail because non-type parameter packs 5134 // have not been implemented. 5135 if (PmDecl && PmDecl->isTemplateParameterPack() && 5136 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5137 Valid = true; 5138 } 5139 } 5140 } else { 5141 // Check the first parameter 5142 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5143 5144 QualType T = (*Param)->getType(); 5145 5146 // unsigned long long int, long double, and any character type are allowed 5147 // as the only parameters. 5148 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5149 Context.hasSameType(T, Context.LongDoubleTy) || 5150 Context.hasSameType(T, Context.CharTy) || 5151 Context.hasSameType(T, Context.WCharTy) || 5152 Context.hasSameType(T, Context.Char16Ty) || 5153 Context.hasSameType(T, Context.Char32Ty)) { 5154 if (++Param == FnDecl->param_end()) 5155 Valid = true; 5156 goto FinishedParams; 5157 } 5158 5159 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5160 const PointerType *PT = T->getAs<PointerType>(); 5161 if (!PT) 5162 goto FinishedParams; 5163 T = PT->getPointeeType(); 5164 if (!T.isConstQualified()) 5165 goto FinishedParams; 5166 T = T.getUnqualifiedType(); 5167 5168 // Move on to the second parameter; 5169 ++Param; 5170 5171 // If there is no second parameter, the first must be a const char * 5172 if (Param == FnDecl->param_end()) { 5173 if (Context.hasSameType(T, Context.CharTy)) 5174 Valid = true; 5175 goto FinishedParams; 5176 } 5177 5178 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5179 // are allowed as the first parameter to a two-parameter function 5180 if (!(Context.hasSameType(T, Context.CharTy) || 5181 Context.hasSameType(T, Context.WCharTy) || 5182 Context.hasSameType(T, Context.Char16Ty) || 5183 Context.hasSameType(T, Context.Char32Ty))) 5184 goto FinishedParams; 5185 5186 // The second and final parameter must be an std::size_t 5187 T = (*Param)->getType().getUnqualifiedType(); 5188 if (Context.hasSameType(T, Context.getSizeType()) && 5189 ++Param == FnDecl->param_end()) 5190 Valid = true; 5191 } 5192 5193 // FIXME: This diagnostic is absolutely terrible. 5194FinishedParams: 5195 if (!Valid) { 5196 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5197 << FnDecl->getDeclName(); 5198 return true; 5199 } 5200 5201 return false; 5202} 5203 5204/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5205/// linkage specification, including the language and (if present) 5206/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5207/// the location of the language string literal, which is provided 5208/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5209/// the '{' brace. Otherwise, this linkage specification does not 5210/// have any braces. 5211Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5212 SourceLocation ExternLoc, 5213 SourceLocation LangLoc, 5214 llvm::StringRef Lang, 5215 SourceLocation LBraceLoc) { 5216 LinkageSpecDecl::LanguageIDs Language; 5217 if (Lang == "\"C\"") 5218 Language = LinkageSpecDecl::lang_c; 5219 else if (Lang == "\"C++\"") 5220 Language = LinkageSpecDecl::lang_cxx; 5221 else { 5222 Diag(LangLoc, diag::err_bad_language); 5223 return DeclPtrTy(); 5224 } 5225 5226 // FIXME: Add all the various semantics of linkage specifications 5227 5228 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5229 LangLoc, Language, 5230 LBraceLoc.isValid()); 5231 CurContext->addDecl(D); 5232 PushDeclContext(S, D); 5233 return DeclPtrTy::make(D); 5234} 5235 5236/// ActOnFinishLinkageSpecification - Completely the definition of 5237/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5238/// valid, it's the position of the closing '}' brace in a linkage 5239/// specification that uses braces. 5240Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5241 DeclPtrTy LinkageSpec, 5242 SourceLocation RBraceLoc) { 5243 if (LinkageSpec) 5244 PopDeclContext(); 5245 return LinkageSpec; 5246} 5247 5248/// \brief Perform semantic analysis for the variable declaration that 5249/// occurs within a C++ catch clause, returning the newly-created 5250/// variable. 5251VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5252 TypeSourceInfo *TInfo, 5253 IdentifierInfo *Name, 5254 SourceLocation Loc, 5255 SourceRange Range) { 5256 bool Invalid = false; 5257 5258 // Arrays and functions decay. 5259 if (ExDeclType->isArrayType()) 5260 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5261 else if (ExDeclType->isFunctionType()) 5262 ExDeclType = Context.getPointerType(ExDeclType); 5263 5264 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5265 // The exception-declaration shall not denote a pointer or reference to an 5266 // incomplete type, other than [cv] void*. 5267 // N2844 forbids rvalue references. 5268 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5269 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5270 Invalid = true; 5271 } 5272 5273 // GCC allows catching pointers and references to incomplete types 5274 // as an extension; so do we, but we warn by default. 5275 5276 QualType BaseType = ExDeclType; 5277 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5278 unsigned DK = diag::err_catch_incomplete; 5279 bool IncompleteCatchIsInvalid = true; 5280 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5281 BaseType = Ptr->getPointeeType(); 5282 Mode = 1; 5283 DK = diag::ext_catch_incomplete_ptr; 5284 IncompleteCatchIsInvalid = false; 5285 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5286 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5287 BaseType = Ref->getPointeeType(); 5288 Mode = 2; 5289 DK = diag::ext_catch_incomplete_ref; 5290 IncompleteCatchIsInvalid = false; 5291 } 5292 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5293 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5294 IncompleteCatchIsInvalid) 5295 Invalid = true; 5296 5297 if (!Invalid && !ExDeclType->isDependentType() && 5298 RequireNonAbstractType(Loc, ExDeclType, 5299 diag::err_abstract_type_in_decl, 5300 AbstractVariableType)) 5301 Invalid = true; 5302 5303 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5304 Name, ExDeclType, TInfo, VarDecl::None, 5305 VarDecl::None); 5306 ExDecl->setExceptionVariable(true); 5307 5308 if (!Invalid) { 5309 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5310 // C++ [except.handle]p16: 5311 // The object declared in an exception-declaration or, if the 5312 // exception-declaration does not specify a name, a temporary (12.2) is 5313 // copy-initialized (8.5) from the exception object. [...] 5314 // The object is destroyed when the handler exits, after the destruction 5315 // of any automatic objects initialized within the handler. 5316 // 5317 // We just pretend to initialize the object with itself, then make sure 5318 // it can be destroyed later. 5319 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5320 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5321 Loc, ExDeclType, 0); 5322 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5323 SourceLocation()); 5324 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5325 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5326 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5327 if (Result.isInvalid()) 5328 Invalid = true; 5329 else 5330 FinalizeVarWithDestructor(ExDecl, RecordTy); 5331 } 5332 } 5333 5334 if (Invalid) 5335 ExDecl->setInvalidDecl(); 5336 5337 return ExDecl; 5338} 5339 5340/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5341/// handler. 5342Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5343 TypeSourceInfo *TInfo = 0; 5344 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5345 5346 bool Invalid = D.isInvalidType(); 5347 IdentifierInfo *II = D.getIdentifier(); 5348 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5349 LookupOrdinaryName, 5350 ForRedeclaration)) { 5351 // The scope should be freshly made just for us. There is just no way 5352 // it contains any previous declaration. 5353 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5354 if (PrevDecl->isTemplateParameter()) { 5355 // Maybe we will complain about the shadowed template parameter. 5356 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5357 } 5358 } 5359 5360 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5361 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5362 << D.getCXXScopeSpec().getRange(); 5363 Invalid = true; 5364 } 5365 5366 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5367 D.getIdentifier(), 5368 D.getIdentifierLoc(), 5369 D.getDeclSpec().getSourceRange()); 5370 5371 if (Invalid) 5372 ExDecl->setInvalidDecl(); 5373 5374 // Add the exception declaration into this scope. 5375 if (II) 5376 PushOnScopeChains(ExDecl, S); 5377 else 5378 CurContext->addDecl(ExDecl); 5379 5380 ProcessDeclAttributes(S, ExDecl, D); 5381 return DeclPtrTy::make(ExDecl); 5382} 5383 5384Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5385 ExprArg assertexpr, 5386 ExprArg assertmessageexpr) { 5387 Expr *AssertExpr = (Expr *)assertexpr.get(); 5388 StringLiteral *AssertMessage = 5389 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5390 5391 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5392 llvm::APSInt Value(32); 5393 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5394 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5395 AssertExpr->getSourceRange(); 5396 return DeclPtrTy(); 5397 } 5398 5399 if (Value == 0) { 5400 Diag(AssertLoc, diag::err_static_assert_failed) 5401 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5402 } 5403 } 5404 5405 assertexpr.release(); 5406 assertmessageexpr.release(); 5407 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5408 AssertExpr, AssertMessage); 5409 5410 CurContext->addDecl(Decl); 5411 return DeclPtrTy::make(Decl); 5412} 5413 5414/// \brief Perform semantic analysis of the given friend type declaration. 5415/// 5416/// \returns A friend declaration that. 5417FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5418 TypeSourceInfo *TSInfo) { 5419 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5420 5421 QualType T = TSInfo->getType(); 5422 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5423 5424 if (!getLangOptions().CPlusPlus0x) { 5425 // C++03 [class.friend]p2: 5426 // An elaborated-type-specifier shall be used in a friend declaration 5427 // for a class.* 5428 // 5429 // * The class-key of the elaborated-type-specifier is required. 5430 if (!ActiveTemplateInstantiations.empty()) { 5431 // Do not complain about the form of friend template types during 5432 // template instantiation; we will already have complained when the 5433 // template was declared. 5434 } else if (!T->isElaboratedTypeSpecifier()) { 5435 // If we evaluated the type to a record type, suggest putting 5436 // a tag in front. 5437 if (const RecordType *RT = T->getAs<RecordType>()) { 5438 RecordDecl *RD = RT->getDecl(); 5439 5440 std::string InsertionText = std::string(" ") + RD->getKindName(); 5441 5442 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5443 << (unsigned) RD->getTagKind() 5444 << T 5445 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5446 InsertionText); 5447 } else { 5448 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5449 << T 5450 << SourceRange(FriendLoc, TypeRange.getEnd()); 5451 } 5452 } else if (T->getAs<EnumType>()) { 5453 Diag(FriendLoc, diag::ext_enum_friend) 5454 << T 5455 << SourceRange(FriendLoc, TypeRange.getEnd()); 5456 } 5457 } 5458 5459 // C++0x [class.friend]p3: 5460 // If the type specifier in a friend declaration designates a (possibly 5461 // cv-qualified) class type, that class is declared as a friend; otherwise, 5462 // the friend declaration is ignored. 5463 5464 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5465 // in [class.friend]p3 that we do not implement. 5466 5467 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5468} 5469 5470/// Handle a friend type declaration. This works in tandem with 5471/// ActOnTag. 5472/// 5473/// Notes on friend class templates: 5474/// 5475/// We generally treat friend class declarations as if they were 5476/// declaring a class. So, for example, the elaborated type specifier 5477/// in a friend declaration is required to obey the restrictions of a 5478/// class-head (i.e. no typedefs in the scope chain), template 5479/// parameters are required to match up with simple template-ids, &c. 5480/// However, unlike when declaring a template specialization, it's 5481/// okay to refer to a template specialization without an empty 5482/// template parameter declaration, e.g. 5483/// friend class A<T>::B<unsigned>; 5484/// We permit this as a special case; if there are any template 5485/// parameters present at all, require proper matching, i.e. 5486/// template <> template <class T> friend class A<int>::B; 5487Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5488 MultiTemplateParamsArg TempParams) { 5489 SourceLocation Loc = DS.getSourceRange().getBegin(); 5490 5491 assert(DS.isFriendSpecified()); 5492 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5493 5494 // Try to convert the decl specifier to a type. This works for 5495 // friend templates because ActOnTag never produces a ClassTemplateDecl 5496 // for a TUK_Friend. 5497 Declarator TheDeclarator(DS, Declarator::MemberContext); 5498 TypeSourceInfo *TSI; 5499 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5500 if (TheDeclarator.isInvalidType()) 5501 return DeclPtrTy(); 5502 5503 if (!TSI) 5504 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5505 5506 // This is definitely an error in C++98. It's probably meant to 5507 // be forbidden in C++0x, too, but the specification is just 5508 // poorly written. 5509 // 5510 // The problem is with declarations like the following: 5511 // template <T> friend A<T>::foo; 5512 // where deciding whether a class C is a friend or not now hinges 5513 // on whether there exists an instantiation of A that causes 5514 // 'foo' to equal C. There are restrictions on class-heads 5515 // (which we declare (by fiat) elaborated friend declarations to 5516 // be) that makes this tractable. 5517 // 5518 // FIXME: handle "template <> friend class A<T>;", which 5519 // is possibly well-formed? Who even knows? 5520 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5521 Diag(Loc, diag::err_tagless_friend_type_template) 5522 << DS.getSourceRange(); 5523 return DeclPtrTy(); 5524 } 5525 5526 // C++98 [class.friend]p1: A friend of a class is a function 5527 // or class that is not a member of the class . . . 5528 // This is fixed in DR77, which just barely didn't make the C++03 5529 // deadline. It's also a very silly restriction that seriously 5530 // affects inner classes and which nobody else seems to implement; 5531 // thus we never diagnose it, not even in -pedantic. 5532 // 5533 // But note that we could warn about it: it's always useless to 5534 // friend one of your own members (it's not, however, worthless to 5535 // friend a member of an arbitrary specialization of your template). 5536 5537 Decl *D; 5538 if (unsigned NumTempParamLists = TempParams.size()) 5539 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5540 NumTempParamLists, 5541 (TemplateParameterList**) TempParams.release(), 5542 TSI, 5543 DS.getFriendSpecLoc()); 5544 else 5545 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5546 5547 if (!D) 5548 return DeclPtrTy(); 5549 5550 D->setAccess(AS_public); 5551 CurContext->addDecl(D); 5552 5553 return DeclPtrTy::make(D); 5554} 5555 5556Sema::DeclPtrTy 5557Sema::ActOnFriendFunctionDecl(Scope *S, 5558 Declarator &D, 5559 bool IsDefinition, 5560 MultiTemplateParamsArg TemplateParams) { 5561 const DeclSpec &DS = D.getDeclSpec(); 5562 5563 assert(DS.isFriendSpecified()); 5564 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5565 5566 SourceLocation Loc = D.getIdentifierLoc(); 5567 TypeSourceInfo *TInfo = 0; 5568 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5569 5570 // C++ [class.friend]p1 5571 // A friend of a class is a function or class.... 5572 // Note that this sees through typedefs, which is intended. 5573 // It *doesn't* see through dependent types, which is correct 5574 // according to [temp.arg.type]p3: 5575 // If a declaration acquires a function type through a 5576 // type dependent on a template-parameter and this causes 5577 // a declaration that does not use the syntactic form of a 5578 // function declarator to have a function type, the program 5579 // is ill-formed. 5580 if (!T->isFunctionType()) { 5581 Diag(Loc, diag::err_unexpected_friend); 5582 5583 // It might be worthwhile to try to recover by creating an 5584 // appropriate declaration. 5585 return DeclPtrTy(); 5586 } 5587 5588 // C++ [namespace.memdef]p3 5589 // - If a friend declaration in a non-local class first declares a 5590 // class or function, the friend class or function is a member 5591 // of the innermost enclosing namespace. 5592 // - The name of the friend is not found by simple name lookup 5593 // until a matching declaration is provided in that namespace 5594 // scope (either before or after the class declaration granting 5595 // friendship). 5596 // - If a friend function is called, its name may be found by the 5597 // name lookup that considers functions from namespaces and 5598 // classes associated with the types of the function arguments. 5599 // - When looking for a prior declaration of a class or a function 5600 // declared as a friend, scopes outside the innermost enclosing 5601 // namespace scope are not considered. 5602 5603 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5604 DeclarationName Name = GetNameForDeclarator(D); 5605 assert(Name); 5606 5607 // The context we found the declaration in, or in which we should 5608 // create the declaration. 5609 DeclContext *DC; 5610 5611 // FIXME: handle local classes 5612 5613 // Recover from invalid scope qualifiers as if they just weren't there. 5614 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5615 ForRedeclaration); 5616 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5617 DC = computeDeclContext(ScopeQual); 5618 5619 // FIXME: handle dependent contexts 5620 if (!DC) return DeclPtrTy(); 5621 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5622 5623 LookupQualifiedName(Previous, DC); 5624 5625 // If searching in that context implicitly found a declaration in 5626 // a different context, treat it like it wasn't found at all. 5627 // TODO: better diagnostics for this case. Suggesting the right 5628 // qualified scope would be nice... 5629 // FIXME: getRepresentativeDecl() is not right here at all 5630 if (Previous.empty() || 5631 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5632 D.setInvalidType(); 5633 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5634 return DeclPtrTy(); 5635 } 5636 5637 // C++ [class.friend]p1: A friend of a class is a function or 5638 // class that is not a member of the class . . . 5639 if (DC->Equals(CurContext)) 5640 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5641 5642 // Otherwise walk out to the nearest namespace scope looking for matches. 5643 } else { 5644 // TODO: handle local class contexts. 5645 5646 DC = CurContext; 5647 while (true) { 5648 // Skip class contexts. If someone can cite chapter and verse 5649 // for this behavior, that would be nice --- it's what GCC and 5650 // EDG do, and it seems like a reasonable intent, but the spec 5651 // really only says that checks for unqualified existing 5652 // declarations should stop at the nearest enclosing namespace, 5653 // not that they should only consider the nearest enclosing 5654 // namespace. 5655 while (DC->isRecord()) 5656 DC = DC->getParent(); 5657 5658 LookupQualifiedName(Previous, DC); 5659 5660 // TODO: decide what we think about using declarations. 5661 if (!Previous.empty()) 5662 break; 5663 5664 if (DC->isFileContext()) break; 5665 DC = DC->getParent(); 5666 } 5667 5668 // C++ [class.friend]p1: A friend of a class is a function or 5669 // class that is not a member of the class . . . 5670 // C++0x changes this for both friend types and functions. 5671 // Most C++ 98 compilers do seem to give an error here, so 5672 // we do, too. 5673 if (!Previous.empty() && DC->Equals(CurContext) 5674 && !getLangOptions().CPlusPlus0x) 5675 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5676 } 5677 5678 if (DC->isFileContext()) { 5679 // This implies that it has to be an operator or function. 5680 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5681 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5682 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5683 Diag(Loc, diag::err_introducing_special_friend) << 5684 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5685 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5686 return DeclPtrTy(); 5687 } 5688 } 5689 5690 bool Redeclaration = false; 5691 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5692 move(TemplateParams), 5693 IsDefinition, 5694 Redeclaration); 5695 if (!ND) return DeclPtrTy(); 5696 5697 assert(ND->getDeclContext() == DC); 5698 assert(ND->getLexicalDeclContext() == CurContext); 5699 5700 // Add the function declaration to the appropriate lookup tables, 5701 // adjusting the redeclarations list as necessary. We don't 5702 // want to do this yet if the friending class is dependent. 5703 // 5704 // Also update the scope-based lookup if the target context's 5705 // lookup context is in lexical scope. 5706 if (!CurContext->isDependentContext()) { 5707 DC = DC->getLookupContext(); 5708 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5709 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5710 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5711 } 5712 5713 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5714 D.getIdentifierLoc(), ND, 5715 DS.getFriendSpecLoc()); 5716 FrD->setAccess(AS_public); 5717 CurContext->addDecl(FrD); 5718 5719 return DeclPtrTy::make(ND); 5720} 5721 5722void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5723 AdjustDeclIfTemplate(dcl); 5724 5725 Decl *Dcl = dcl.getAs<Decl>(); 5726 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5727 if (!Fn) { 5728 Diag(DelLoc, diag::err_deleted_non_function); 5729 return; 5730 } 5731 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5732 Diag(DelLoc, diag::err_deleted_decl_not_first); 5733 Diag(Prev->getLocation(), diag::note_previous_declaration); 5734 // If the declaration wasn't the first, we delete the function anyway for 5735 // recovery. 5736 } 5737 Fn->setDeleted(); 5738} 5739 5740static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5741 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5742 ++CI) { 5743 Stmt *SubStmt = *CI; 5744 if (!SubStmt) 5745 continue; 5746 if (isa<ReturnStmt>(SubStmt)) 5747 Self.Diag(SubStmt->getSourceRange().getBegin(), 5748 diag::err_return_in_constructor_handler); 5749 if (!isa<Expr>(SubStmt)) 5750 SearchForReturnInStmt(Self, SubStmt); 5751 } 5752} 5753 5754void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5755 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5756 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5757 SearchForReturnInStmt(*this, Handler); 5758 } 5759} 5760 5761bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5762 const CXXMethodDecl *Old) { 5763 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5764 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5765 5766 if (Context.hasSameType(NewTy, OldTy) || 5767 NewTy->isDependentType() || OldTy->isDependentType()) 5768 return false; 5769 5770 // Check if the return types are covariant 5771 QualType NewClassTy, OldClassTy; 5772 5773 /// Both types must be pointers or references to classes. 5774 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5775 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5776 NewClassTy = NewPT->getPointeeType(); 5777 OldClassTy = OldPT->getPointeeType(); 5778 } 5779 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5780 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5781 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5782 NewClassTy = NewRT->getPointeeType(); 5783 OldClassTy = OldRT->getPointeeType(); 5784 } 5785 } 5786 } 5787 5788 // The return types aren't either both pointers or references to a class type. 5789 if (NewClassTy.isNull()) { 5790 Diag(New->getLocation(), 5791 diag::err_different_return_type_for_overriding_virtual_function) 5792 << New->getDeclName() << NewTy << OldTy; 5793 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5794 5795 return true; 5796 } 5797 5798 // C++ [class.virtual]p6: 5799 // If the return type of D::f differs from the return type of B::f, the 5800 // class type in the return type of D::f shall be complete at the point of 5801 // declaration of D::f or shall be the class type D. 5802 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5803 if (!RT->isBeingDefined() && 5804 RequireCompleteType(New->getLocation(), NewClassTy, 5805 PDiag(diag::err_covariant_return_incomplete) 5806 << New->getDeclName())) 5807 return true; 5808 } 5809 5810 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5811 // Check if the new class derives from the old class. 5812 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5813 Diag(New->getLocation(), 5814 diag::err_covariant_return_not_derived) 5815 << New->getDeclName() << NewTy << OldTy; 5816 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5817 return true; 5818 } 5819 5820 // Check if we the conversion from derived to base is valid. 5821 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5822 diag::err_covariant_return_inaccessible_base, 5823 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5824 // FIXME: Should this point to the return type? 5825 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5826 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5827 return true; 5828 } 5829 } 5830 5831 // The qualifiers of the return types must be the same. 5832 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5833 Diag(New->getLocation(), 5834 diag::err_covariant_return_type_different_qualifications) 5835 << New->getDeclName() << NewTy << OldTy; 5836 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5837 return true; 5838 }; 5839 5840 5841 // The new class type must have the same or less qualifiers as the old type. 5842 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5843 Diag(New->getLocation(), 5844 diag::err_covariant_return_type_class_type_more_qualified) 5845 << New->getDeclName() << NewTy << OldTy; 5846 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5847 return true; 5848 }; 5849 5850 return false; 5851} 5852 5853bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5854 const CXXMethodDecl *Old) 5855{ 5856 if (Old->hasAttr<FinalAttr>()) { 5857 Diag(New->getLocation(), diag::err_final_function_overridden) 5858 << New->getDeclName(); 5859 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5860 return true; 5861 } 5862 5863 return false; 5864} 5865 5866/// \brief Mark the given method pure. 5867/// 5868/// \param Method the method to be marked pure. 5869/// 5870/// \param InitRange the source range that covers the "0" initializer. 5871bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5872 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5873 Method->setPure(); 5874 5875 // A class is abstract if at least one function is pure virtual. 5876 Method->getParent()->setAbstract(true); 5877 return false; 5878 } 5879 5880 if (!Method->isInvalidDecl()) 5881 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5882 << Method->getDeclName() << InitRange; 5883 return true; 5884} 5885 5886/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5887/// an initializer for the out-of-line declaration 'Dcl'. The scope 5888/// is a fresh scope pushed for just this purpose. 5889/// 5890/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5891/// static data member of class X, names should be looked up in the scope of 5892/// class X. 5893void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5894 // If there is no declaration, there was an error parsing it. 5895 Decl *D = Dcl.getAs<Decl>(); 5896 if (D == 0) return; 5897 5898 // We should only get called for declarations with scope specifiers, like: 5899 // int foo::bar; 5900 assert(D->isOutOfLine()); 5901 EnterDeclaratorContext(S, D->getDeclContext()); 5902} 5903 5904/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5905/// initializer for the out-of-line declaration 'Dcl'. 5906void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5907 // If there is no declaration, there was an error parsing it. 5908 Decl *D = Dcl.getAs<Decl>(); 5909 if (D == 0) return; 5910 5911 assert(D->isOutOfLine()); 5912 ExitDeclaratorContext(S); 5913} 5914 5915/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5916/// C++ if/switch/while/for statement. 5917/// e.g: "if (int x = f()) {...}" 5918Action::DeclResult 5919Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5920 // C++ 6.4p2: 5921 // The declarator shall not specify a function or an array. 5922 // The type-specifier-seq shall not contain typedef and shall not declare a 5923 // new class or enumeration. 5924 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5925 "Parser allowed 'typedef' as storage class of condition decl."); 5926 5927 TypeSourceInfo *TInfo = 0; 5928 TagDecl *OwnedTag = 0; 5929 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5930 5931 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5932 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5933 // would be created and CXXConditionDeclExpr wants a VarDecl. 5934 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5935 << D.getSourceRange(); 5936 return DeclResult(); 5937 } else if (OwnedTag && OwnedTag->isDefinition()) { 5938 // The type-specifier-seq shall not declare a new class or enumeration. 5939 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5940 } 5941 5942 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5943 if (!Dcl) 5944 return DeclResult(); 5945 5946 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5947 VD->setDeclaredInCondition(true); 5948 return Dcl; 5949} 5950 5951static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5952 // Ignore dependent types. 5953 if (MD->isDependentContext()) 5954 return false; 5955 5956 // Ignore declarations that are not definitions. 5957 if (!MD->isThisDeclarationADefinition()) 5958 return false; 5959 5960 CXXRecordDecl *RD = MD->getParent(); 5961 5962 // Ignore classes without a vtable. 5963 if (!RD->isDynamicClass()) 5964 return false; 5965 5966 switch (MD->getParent()->getTemplateSpecializationKind()) { 5967 case TSK_Undeclared: 5968 case TSK_ExplicitSpecialization: 5969 // Classes that aren't instantiations of templates don't need their 5970 // virtual methods marked until we see the definition of the key 5971 // function. 5972 break; 5973 5974 case TSK_ImplicitInstantiation: 5975 // This is a constructor of a class template; mark all of the virtual 5976 // members as referenced to ensure that they get instantiatied. 5977 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5978 return true; 5979 break; 5980 5981 case TSK_ExplicitInstantiationDeclaration: 5982 return false; 5983 5984 case TSK_ExplicitInstantiationDefinition: 5985 // This is method of a explicit instantiation; mark all of the virtual 5986 // members as referenced to ensure that they get instantiatied. 5987 return true; 5988 } 5989 5990 // Consider only out-of-line definitions of member functions. When we see 5991 // an inline definition, it's too early to compute the key function. 5992 if (!MD->isOutOfLine()) 5993 return false; 5994 5995 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5996 5997 // If there is no key function, we will need a copy of the vtable. 5998 if (!KeyFunction) 5999 return true; 6000 6001 // If this is the key function, we need to mark virtual members. 6002 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 6003 return true; 6004 6005 return false; 6006} 6007 6008void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 6009 CXXMethodDecl *MD) { 6010 CXXRecordDecl *RD = MD->getParent(); 6011 6012 // We will need to mark all of the virtual members as referenced to build the 6013 // vtable. 6014 if (!needsVTable(MD, Context)) 6015 return; 6016 6017 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 6018 if (kind == TSK_ImplicitInstantiation) 6019 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 6020 else 6021 MarkVirtualMembersReferenced(Loc, RD); 6022} 6023 6024bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 6025 if (ClassesWithUnmarkedVirtualMembers.empty()) 6026 return false; 6027 6028 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 6029 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 6030 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 6031 ClassesWithUnmarkedVirtualMembers.pop_back(); 6032 MarkVirtualMembersReferenced(Loc, RD); 6033 } 6034 6035 return true; 6036} 6037 6038void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6039 const CXXRecordDecl *RD) { 6040 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6041 e = RD->method_end(); i != e; ++i) { 6042 CXXMethodDecl *MD = *i; 6043 6044 // C++ [basic.def.odr]p2: 6045 // [...] A virtual member function is used if it is not pure. [...] 6046 if (MD->isVirtual() && !MD->isPure()) 6047 MarkDeclarationReferenced(Loc, MD); 6048 } 6049 6050 // Only classes that have virtual bases need a VTT. 6051 if (RD->getNumVBases() == 0) 6052 return; 6053 6054 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6055 e = RD->bases_end(); i != e; ++i) { 6056 const CXXRecordDecl *Base = 6057 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6058 if (i->isVirtual()) 6059 continue; 6060 if (Base->getNumVBases() == 0) 6061 continue; 6062 MarkVirtualMembersReferenced(Loc, Base); 6063 } 6064} 6065 6066/// SetIvarInitializers - This routine builds initialization ASTs for the 6067/// Objective-C implementation whose ivars need be initialized. 6068void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6069 if (!getLangOptions().CPlusPlus) 6070 return; 6071 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6072 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6073 CollectIvarsToConstructOrDestruct(OID, ivars); 6074 if (ivars.empty()) 6075 return; 6076 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6077 for (unsigned i = 0; i < ivars.size(); i++) { 6078 FieldDecl *Field = ivars[i]; 6079 CXXBaseOrMemberInitializer *Member; 6080 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6081 InitializationKind InitKind = 6082 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6083 6084 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6085 Sema::OwningExprResult MemberInit = 6086 InitSeq.Perform(*this, InitEntity, InitKind, 6087 Sema::MultiExprArg(*this, 0, 0)); 6088 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6089 // Note, MemberInit could actually come back empty if no initialization 6090 // is required (e.g., because it would call a trivial default constructor) 6091 if (!MemberInit.get() || MemberInit.isInvalid()) 6092 continue; 6093 6094 Member = 6095 new (Context) CXXBaseOrMemberInitializer(Context, 6096 Field, SourceLocation(), 6097 SourceLocation(), 6098 MemberInit.takeAs<Expr>(), 6099 SourceLocation()); 6100 AllToInit.push_back(Member); 6101 } 6102 ObjCImplementation->setIvarInitializers(Context, 6103 AllToInit.data(), AllToInit.size()); 6104 } 6105} 6106