SemaDeclCXX.cpp revision e58479760ac3cc56f8f59ddf7e25982298581bf2
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 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 assert(getLangOptions().CPlusPlus && "No class names in C!"); 428 429 CXXRecordDecl *CurDecl; 430 if (SS && SS->isSet() && !SS->isInvalid()) { 431 DeclContext *DC = computeDeclContext(*SS, true); 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 433 } else 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 435 436 if (CurDecl && CurDecl->getIdentifier()) 437 return &II == CurDecl->getIdentifier(); 438 else 439 return false; 440} 441 442/// \brief Check the validity of a C++ base class specifier. 443/// 444/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 445/// and returns NULL otherwise. 446CXXBaseSpecifier * 447Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 448 SourceRange SpecifierRange, 449 bool Virtual, AccessSpecifier Access, 450 TypeSourceInfo *TInfo) { 451 QualType BaseType = TInfo->getType(); 452 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == TTK_Class, 464 Access, TInfo); 465 466 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 467 468 // Base specifiers must be record types. 469 if (!BaseType->isRecordType()) { 470 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 471 return 0; 472 } 473 474 // C++ [class.union]p1: 475 // A union shall not be used as a base class. 476 if (BaseType->isUnionType()) { 477 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 478 return 0; 479 } 480 481 // C++ [class.derived]p2: 482 // The class-name in a base-specifier shall not be an incompletely 483 // defined class. 484 if (RequireCompleteType(BaseLoc, BaseType, 485 PDiag(diag::err_incomplete_base_class) 486 << SpecifierRange)) 487 return 0; 488 489 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 490 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 491 assert(BaseDecl && "Record type has no declaration"); 492 BaseDecl = BaseDecl->getDefinition(); 493 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 494 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 495 assert(CXXBaseDecl && "Base type is not a C++ type"); 496 497 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 498 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 499 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 500 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 501 << BaseType; 502 return 0; 503 } 504 505 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 506 507 // Create the base specifier. 508 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 509 Class->getTagKind() == TTK_Class, 510 Access, TInfo); 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 TypeSourceInfo *TInfo = 0; 598 GetTypeFromParser(basetype, &TInfo); 599 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 600 Virtual, Access, TInfo)) 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 if (!Class->hasObjectMember()) { 627 if (const RecordType *FDTTy = 628 NewBaseType.getTypePtr()->getAs<RecordType>()) 629 if (FDTTy->getDecl()->hasObjectMember()) 630 Class->setHasObjectMember(true); 631 } 632 633 if (KnownBaseTypes[NewBaseType]) { 634 // C++ [class.mi]p3: 635 // A class shall not be specified as a direct base class of a 636 // derived class more than once. 637 Diag(Bases[idx]->getSourceRange().getBegin(), 638 diag::err_duplicate_base_class) 639 << KnownBaseTypes[NewBaseType]->getType() 640 << Bases[idx]->getSourceRange(); 641 642 // Delete the duplicate base class specifier; we're going to 643 // overwrite its pointer later. 644 Context.Deallocate(Bases[idx]); 645 646 Invalid = true; 647 } else { 648 // Okay, add this new base class. 649 KnownBaseTypes[NewBaseType] = Bases[idx]; 650 Bases[NumGoodBases++] = Bases[idx]; 651 } 652 } 653 654 // Attach the remaining base class specifiers to the derived class. 655 Class->setBases(Bases, NumGoodBases); 656 657 // Delete the remaining (good) base class specifiers, since their 658 // data has been copied into the CXXRecordDecl. 659 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 660 Context.Deallocate(Bases[idx]); 661 662 return Invalid; 663} 664 665/// ActOnBaseSpecifiers - Attach the given base specifiers to the 666/// class, after checking whether there are any duplicate base 667/// classes. 668void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 669 unsigned NumBases) { 670 if (!ClassDecl || !Bases || !NumBases) 671 return; 672 673 AdjustDeclIfTemplate(ClassDecl); 674 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 675 (CXXBaseSpecifier**)(Bases), NumBases); 676} 677 678static CXXRecordDecl *GetClassForType(QualType T) { 679 if (const RecordType *RT = T->getAs<RecordType>()) 680 return cast<CXXRecordDecl>(RT->getDecl()); 681 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 682 return ICT->getDecl(); 683 else 684 return 0; 685} 686 687/// \brief Determine whether the type \p Derived is a C++ class that is 688/// derived from the type \p Base. 689bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 694 if (!DerivedRD) 695 return false; 696 697 CXXRecordDecl *BaseRD = GetClassForType(Base); 698 if (!BaseRD) 699 return false; 700 701 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 702 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 703} 704 705/// \brief Determine whether the type \p Derived is a C++ class that is 706/// derived from the type \p Base. 707bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 708 if (!getLangOptions().CPlusPlus) 709 return false; 710 711 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 712 if (!DerivedRD) 713 return false; 714 715 CXXRecordDecl *BaseRD = GetClassForType(Base); 716 if (!BaseRD) 717 return false; 718 719 return DerivedRD->isDerivedFrom(BaseRD, Paths); 720} 721 722void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 723 CXXCastPath &BasePathArray) { 724 assert(BasePathArray.empty() && "Base path array must be empty!"); 725 assert(Paths.isRecordingPaths() && "Must record paths!"); 726 727 const CXXBasePath &Path = Paths.front(); 728 729 // We first go backward and check if we have a virtual base. 730 // FIXME: It would be better if CXXBasePath had the base specifier for 731 // the nearest virtual base. 732 unsigned Start = 0; 733 for (unsigned I = Path.size(); I != 0; --I) { 734 if (Path[I - 1].Base->isVirtual()) { 735 Start = I - 1; 736 break; 737 } 738 } 739 740 // Now add all bases. 741 for (unsigned I = Start, E = Path.size(); I != E; ++I) 742 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 743} 744 745/// \brief Determine whether the given base path includes a virtual 746/// base class. 747bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 748 for (CXXCastPath::const_iterator B = BasePath.begin(), 749 BEnd = BasePath.end(); 750 B != BEnd; ++B) 751 if ((*B)->isVirtual()) 752 return true; 753 754 return false; 755} 756 757/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 758/// conversion (where Derived and Base are class types) is 759/// well-formed, meaning that the conversion is unambiguous (and 760/// that all of the base classes are accessible). Returns true 761/// and emits a diagnostic if the code is ill-formed, returns false 762/// otherwise. Loc is the location where this routine should point to 763/// if there is an error, and Range is the source range to highlight 764/// if there is an error. 765bool 766Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 767 unsigned InaccessibleBaseID, 768 unsigned AmbigiousBaseConvID, 769 SourceLocation Loc, SourceRange Range, 770 DeclarationName Name, 771 CXXCastPath *BasePath) { 772 // First, determine whether the path from Derived to Base is 773 // ambiguous. This is slightly more expensive than checking whether 774 // the Derived to Base conversion exists, because here we need to 775 // explore multiple paths to determine if there is an ambiguity. 776 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 777 /*DetectVirtual=*/false); 778 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 779 assert(DerivationOkay && 780 "Can only be used with a derived-to-base conversion"); 781 (void)DerivationOkay; 782 783 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 784 if (InaccessibleBaseID) { 785 // Check that the base class can be accessed. 786 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 787 InaccessibleBaseID)) { 788 case AR_inaccessible: 789 return true; 790 case AR_accessible: 791 case AR_dependent: 792 case AR_delayed: 793 break; 794 } 795 } 796 797 // Build a base path if necessary. 798 if (BasePath) 799 BuildBasePathArray(Paths, *BasePath); 800 return false; 801 } 802 803 // We know that the derived-to-base conversion is ambiguous, and 804 // we're going to produce a diagnostic. Perform the derived-to-base 805 // search just one more time to compute all of the possible paths so 806 // that we can print them out. This is more expensive than any of 807 // the previous derived-to-base checks we've done, but at this point 808 // performance isn't as much of an issue. 809 Paths.clear(); 810 Paths.setRecordingPaths(true); 811 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 812 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 813 (void)StillOkay; 814 815 // Build up a textual representation of the ambiguous paths, e.g., 816 // D -> B -> A, that will be used to illustrate the ambiguous 817 // conversions in the diagnostic. We only print one of the paths 818 // to each base class subobject. 819 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 820 821 Diag(Loc, AmbigiousBaseConvID) 822 << Derived << Base << PathDisplayStr << Range << Name; 823 return true; 824} 825 826bool 827Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 828 SourceLocation Loc, SourceRange Range, 829 CXXCastPath *BasePath, 830 bool IgnoreAccess) { 831 return CheckDerivedToBaseConversion(Derived, Base, 832 IgnoreAccess ? 0 833 : diag::err_upcast_to_inaccessible_base, 834 diag::err_ambiguous_derived_to_base_conv, 835 Loc, Range, DeclarationName(), 836 BasePath); 837} 838 839 840/// @brief Builds a string representing ambiguous paths from a 841/// specific derived class to different subobjects of the same base 842/// class. 843/// 844/// This function builds a string that can be used in error messages 845/// to show the different paths that one can take through the 846/// inheritance hierarchy to go from the derived class to different 847/// subobjects of a base class. The result looks something like this: 848/// @code 849/// struct D -> struct B -> struct A 850/// struct D -> struct C -> struct A 851/// @endcode 852std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 853 std::string PathDisplayStr; 854 std::set<unsigned> DisplayedPaths; 855 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 856 Path != Paths.end(); ++Path) { 857 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 858 // We haven't displayed a path to this particular base 859 // class subobject yet. 860 PathDisplayStr += "\n "; 861 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 862 for (CXXBasePath::const_iterator Element = Path->begin(); 863 Element != Path->end(); ++Element) 864 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 865 } 866 } 867 868 return PathDisplayStr; 869} 870 871//===----------------------------------------------------------------------===// 872// C++ class member Handling 873//===----------------------------------------------------------------------===// 874 875/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 876Sema::DeclPtrTy 877Sema::ActOnAccessSpecifier(AccessSpecifier Access, 878 SourceLocation ASLoc, SourceLocation ColonLoc) { 879 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 880 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 881 ASLoc, ColonLoc); 882 CurContext->addHiddenDecl(ASDecl); 883 return DeclPtrTy::make(ASDecl); 884} 885 886/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 887/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 888/// bitfield width if there is one and 'InitExpr' specifies the initializer if 889/// any. 890Sema::DeclPtrTy 891Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 892 MultiTemplateParamsArg TemplateParameterLists, 893 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 894 bool Deleted) { 895 const DeclSpec &DS = D.getDeclSpec(); 896 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 897 DeclarationName Name = NameInfo.getName(); 898 SourceLocation Loc = NameInfo.getLoc(); 899 Expr *BitWidth = static_cast<Expr*>(BW); 900 Expr *Init = static_cast<Expr*>(InitExpr); 901 902 assert(isa<CXXRecordDecl>(CurContext)); 903 assert(!DS.isFriendSpecified()); 904 905 bool isFunc = false; 906 if (D.isFunctionDeclarator()) 907 isFunc = true; 908 else if (D.getNumTypeObjects() == 0 && 909 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 910 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 911 isFunc = TDType->isFunctionType(); 912 } 913 914 // C++ 9.2p6: A member shall not be declared to have automatic storage 915 // duration (auto, register) or with the extern storage-class-specifier. 916 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 917 // data members and cannot be applied to names declared const or static, 918 // and cannot be applied to reference members. 919 switch (DS.getStorageClassSpec()) { 920 case DeclSpec::SCS_unspecified: 921 case DeclSpec::SCS_typedef: 922 case DeclSpec::SCS_static: 923 // FALL THROUGH. 924 break; 925 case DeclSpec::SCS_mutable: 926 if (isFunc) { 927 if (DS.getStorageClassSpecLoc().isValid()) 928 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 929 else 930 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 931 932 // FIXME: It would be nicer if the keyword was ignored only for this 933 // declarator. Otherwise we could get follow-up errors. 934 D.getMutableDeclSpec().ClearStorageClassSpecs(); 935 } 936 break; 937 default: 938 if (DS.getStorageClassSpecLoc().isValid()) 939 Diag(DS.getStorageClassSpecLoc(), 940 diag::err_storageclass_invalid_for_member); 941 else 942 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 943 D.getMutableDeclSpec().ClearStorageClassSpecs(); 944 } 945 946 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 947 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 948 !isFunc); 949 950 Decl *Member; 951 if (isInstField) { 952 // FIXME: Check for template parameters! 953 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 954 AS); 955 assert(Member && "HandleField never returns null"); 956 } else { 957 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 958 .getAs<Decl>(); 959 if (!Member) { 960 if (BitWidth) DeleteExpr(BitWidth); 961 return DeclPtrTy(); 962 } 963 964 // Non-instance-fields can't have a bitfield. 965 if (BitWidth) { 966 if (Member->isInvalidDecl()) { 967 // don't emit another diagnostic. 968 } else if (isa<VarDecl>(Member)) { 969 // C++ 9.6p3: A bit-field shall not be a static member. 970 // "static member 'A' cannot be a bit-field" 971 Diag(Loc, diag::err_static_not_bitfield) 972 << Name << BitWidth->getSourceRange(); 973 } else if (isa<TypedefDecl>(Member)) { 974 // "typedef member 'x' cannot be a bit-field" 975 Diag(Loc, diag::err_typedef_not_bitfield) 976 << Name << BitWidth->getSourceRange(); 977 } else { 978 // A function typedef ("typedef int f(); f a;"). 979 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 980 Diag(Loc, diag::err_not_integral_type_bitfield) 981 << Name << cast<ValueDecl>(Member)->getType() 982 << BitWidth->getSourceRange(); 983 } 984 985 DeleteExpr(BitWidth); 986 BitWidth = 0; 987 Member->setInvalidDecl(); 988 } 989 990 Member->setAccess(AS); 991 992 // If we have declared a member function template, set the access of the 993 // templated declaration as well. 994 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 995 FunTmpl->getTemplatedDecl()->setAccess(AS); 996 } 997 998 assert((Name || isInstField) && "No identifier for non-field ?"); 999 1000 if (Init) 1001 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1002 if (Deleted) // FIXME: Source location is not very good. 1003 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1004 1005 if (isInstField) { 1006 FieldCollector->Add(cast<FieldDecl>(Member)); 1007 return DeclPtrTy(); 1008 } 1009 return DeclPtrTy::make(Member); 1010} 1011 1012/// \brief Find the direct and/or virtual base specifiers that 1013/// correspond to the given base type, for use in base initialization 1014/// within a constructor. 1015static bool FindBaseInitializer(Sema &SemaRef, 1016 CXXRecordDecl *ClassDecl, 1017 QualType BaseType, 1018 const CXXBaseSpecifier *&DirectBaseSpec, 1019 const CXXBaseSpecifier *&VirtualBaseSpec) { 1020 // First, check for a direct base class. 1021 DirectBaseSpec = 0; 1022 for (CXXRecordDecl::base_class_const_iterator Base 1023 = ClassDecl->bases_begin(); 1024 Base != ClassDecl->bases_end(); ++Base) { 1025 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1026 // We found a direct base of this type. That's what we're 1027 // initializing. 1028 DirectBaseSpec = &*Base; 1029 break; 1030 } 1031 } 1032 1033 // Check for a virtual base class. 1034 // FIXME: We might be able to short-circuit this if we know in advance that 1035 // there are no virtual bases. 1036 VirtualBaseSpec = 0; 1037 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1038 // We haven't found a base yet; search the class hierarchy for a 1039 // virtual base class. 1040 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1041 /*DetectVirtual=*/false); 1042 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1043 BaseType, Paths)) { 1044 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1045 Path != Paths.end(); ++Path) { 1046 if (Path->back().Base->isVirtual()) { 1047 VirtualBaseSpec = Path->back().Base; 1048 break; 1049 } 1050 } 1051 } 1052 } 1053 1054 return DirectBaseSpec || VirtualBaseSpec; 1055} 1056 1057/// ActOnMemInitializer - Handle a C++ member initializer. 1058Sema::MemInitResult 1059Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1060 Scope *S, 1061 CXXScopeSpec &SS, 1062 IdentifierInfo *MemberOrBase, 1063 TypeTy *TemplateTypeTy, 1064 SourceLocation IdLoc, 1065 SourceLocation LParenLoc, 1066 ExprTy **Args, unsigned NumArgs, 1067 SourceLocation *CommaLocs, 1068 SourceLocation RParenLoc) { 1069 if (!ConstructorD) 1070 return true; 1071 1072 AdjustDeclIfTemplate(ConstructorD); 1073 1074 CXXConstructorDecl *Constructor 1075 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1076 if (!Constructor) { 1077 // The user wrote a constructor initializer on a function that is 1078 // not a C++ constructor. Ignore the error for now, because we may 1079 // have more member initializers coming; we'll diagnose it just 1080 // once in ActOnMemInitializers. 1081 return true; 1082 } 1083 1084 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1085 1086 // C++ [class.base.init]p2: 1087 // Names in a mem-initializer-id are looked up in the scope of the 1088 // constructor’s class and, if not found in that scope, are looked 1089 // up in the scope containing the constructor’s 1090 // definition. [Note: if the constructor’s class contains a member 1091 // with the same name as a direct or virtual base class of the 1092 // class, a mem-initializer-id naming the member or base class and 1093 // composed of a single identifier refers to the class member. A 1094 // mem-initializer-id for the hidden base class may be specified 1095 // using a qualified name. ] 1096 if (!SS.getScopeRep() && !TemplateTypeTy) { 1097 // Look for a member, first. 1098 FieldDecl *Member = 0; 1099 DeclContext::lookup_result Result 1100 = ClassDecl->lookup(MemberOrBase); 1101 if (Result.first != Result.second) 1102 Member = dyn_cast<FieldDecl>(*Result.first); 1103 1104 // FIXME: Handle members of an anonymous union. 1105 1106 if (Member) 1107 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1108 LParenLoc, RParenLoc); 1109 } 1110 // It didn't name a member, so see if it names a class. 1111 QualType BaseType; 1112 TypeSourceInfo *TInfo = 0; 1113 1114 if (TemplateTypeTy) { 1115 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1116 } else { 1117 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1118 LookupParsedName(R, S, &SS); 1119 1120 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1121 if (!TyD) { 1122 if (R.isAmbiguous()) return true; 1123 1124 // We don't want access-control diagnostics here. 1125 R.suppressDiagnostics(); 1126 1127 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1128 bool NotUnknownSpecialization = false; 1129 DeclContext *DC = computeDeclContext(SS, false); 1130 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1131 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1132 1133 if (!NotUnknownSpecialization) { 1134 // When the scope specifier can refer to a member of an unknown 1135 // specialization, we take it as a type name. 1136 BaseType = CheckTypenameType(ETK_None, 1137 (NestedNameSpecifier *)SS.getScopeRep(), 1138 *MemberOrBase, SourceLocation(), 1139 SS.getRange(), IdLoc); 1140 if (BaseType.isNull()) 1141 return true; 1142 1143 R.clear(); 1144 R.setLookupName(MemberOrBase); 1145 } 1146 } 1147 1148 // If no results were found, try to correct typos. 1149 if (R.empty() && BaseType.isNull() && 1150 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1151 R.isSingleResult()) { 1152 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1153 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1154 // We have found a non-static data member with a similar 1155 // name to what was typed; complain and initialize that 1156 // member. 1157 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1158 << MemberOrBase << true << R.getLookupName() 1159 << FixItHint::CreateReplacement(R.getNameLoc(), 1160 R.getLookupName().getAsString()); 1161 Diag(Member->getLocation(), diag::note_previous_decl) 1162 << Member->getDeclName(); 1163 1164 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1165 LParenLoc, RParenLoc); 1166 } 1167 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1168 const CXXBaseSpecifier *DirectBaseSpec; 1169 const CXXBaseSpecifier *VirtualBaseSpec; 1170 if (FindBaseInitializer(*this, ClassDecl, 1171 Context.getTypeDeclType(Type), 1172 DirectBaseSpec, VirtualBaseSpec)) { 1173 // We have found a direct or virtual base class with a 1174 // similar name to what was typed; complain and initialize 1175 // that base class. 1176 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1177 << MemberOrBase << false << R.getLookupName() 1178 << FixItHint::CreateReplacement(R.getNameLoc(), 1179 R.getLookupName().getAsString()); 1180 1181 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1182 : VirtualBaseSpec; 1183 Diag(BaseSpec->getSourceRange().getBegin(), 1184 diag::note_base_class_specified_here) 1185 << BaseSpec->getType() 1186 << BaseSpec->getSourceRange(); 1187 1188 TyD = Type; 1189 } 1190 } 1191 } 1192 1193 if (!TyD && BaseType.isNull()) { 1194 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 return true; 1197 } 1198 } 1199 1200 if (BaseType.isNull()) { 1201 BaseType = Context.getTypeDeclType(TyD); 1202 if (SS.isSet()) { 1203 NestedNameSpecifier *Qualifier = 1204 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1205 1206 // FIXME: preserve source range information 1207 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1208 } 1209 } 1210 } 1211 1212 if (!TInfo) 1213 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1214 1215 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1216 LParenLoc, RParenLoc, ClassDecl); 1217} 1218 1219/// Checks an initializer expression for use of uninitialized fields, such as 1220/// containing the field that is being initialized. Returns true if there is an 1221/// uninitialized field was used an updates the SourceLocation parameter; false 1222/// otherwise. 1223static bool InitExprContainsUninitializedFields(const Stmt *S, 1224 const FieldDecl *LhsField, 1225 SourceLocation *L) { 1226 if (isa<CallExpr>(S)) { 1227 // Do not descend into function calls or constructors, as the use 1228 // of an uninitialized field may be valid. One would have to inspect 1229 // the contents of the function/ctor to determine if it is safe or not. 1230 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1231 // may be safe, depending on what the function/ctor does. 1232 return false; 1233 } 1234 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1235 const NamedDecl *RhsField = ME->getMemberDecl(); 1236 if (RhsField == LhsField) { 1237 // Initializing a field with itself. Throw a warning. 1238 // But wait; there are exceptions! 1239 // Exception #1: The field may not belong to this record. 1240 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1241 const Expr *base = ME->getBase(); 1242 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1243 // Even though the field matches, it does not belong to this record. 1244 return false; 1245 } 1246 // None of the exceptions triggered; return true to indicate an 1247 // uninitialized field was used. 1248 *L = ME->getMemberLoc(); 1249 return true; 1250 } 1251 } 1252 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1253 it != e; ++it) { 1254 if (!*it) { 1255 // An expression such as 'member(arg ?: "")' may trigger this. 1256 continue; 1257 } 1258 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1259 return true; 1260 } 1261 return false; 1262} 1263 1264Sema::MemInitResult 1265Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1266 unsigned NumArgs, SourceLocation IdLoc, 1267 SourceLocation LParenLoc, 1268 SourceLocation RParenLoc) { 1269 // Diagnose value-uses of fields to initialize themselves, e.g. 1270 // foo(foo) 1271 // where foo is not also a parameter to the constructor. 1272 // TODO: implement -Wuninitialized and fold this into that framework. 1273 for (unsigned i = 0; i < NumArgs; ++i) { 1274 SourceLocation L; 1275 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1276 // FIXME: Return true in the case when other fields are used before being 1277 // uninitialized. For example, let this field be the i'th field. When 1278 // initializing the i'th field, throw a warning if any of the >= i'th 1279 // fields are used, as they are not yet initialized. 1280 // Right now we are only handling the case where the i'th field uses 1281 // itself in its initializer. 1282 Diag(L, diag::warn_field_is_uninit); 1283 } 1284 } 1285 1286 bool HasDependentArg = false; 1287 for (unsigned i = 0; i < NumArgs; i++) 1288 HasDependentArg |= Args[i]->isTypeDependent(); 1289 1290 if (Member->getType()->isDependentType() || HasDependentArg) { 1291 // Can't check initialization for a member of dependent type or when 1292 // any of the arguments are type-dependent expressions. 1293 OwningExprResult Init 1294 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1295 RParenLoc)); 1296 1297 // Erase any temporaries within this evaluation context; we're not 1298 // going to track them in the AST, since we'll be rebuilding the 1299 // ASTs during template instantiation. 1300 ExprTemporaries.erase( 1301 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1302 ExprTemporaries.end()); 1303 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 1309 } 1310 1311 if (Member->isInvalidDecl()) 1312 return true; 1313 1314 // Initialize the member. 1315 InitializedEntity MemberEntity = 1316 InitializedEntity::InitializeMember(Member, 0); 1317 InitializationKind Kind = 1318 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1319 1320 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1321 1322 OwningExprResult MemberInit = 1323 InitSeq.Perform(*this, MemberEntity, Kind, 1324 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // C++0x [class.base.init]p7: 1329 // The initialization of each base and member constitutes a 1330 // full-expression. 1331 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // If we are in a dependent context, template instantiation will 1336 // perform this type-checking again. Just save the arguments that we 1337 // received in a ParenListExpr. 1338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1339 // of the information that we have about the member 1340 // initializer. However, deconstructing the ASTs is a dicey process, 1341 // and this approach is far more likely to get the corner cases right. 1342 if (CurContext->isDependentContext()) { 1343 // Bump the reference count of all of the arguments. 1344 for (unsigned I = 0; I != NumArgs; ++I) 1345 Args[I]->Retain(); 1346 1347 OwningExprResult Init 1348 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc)); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init.takeAs<Expr>(), 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.takeAs<Expr>(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc 1372 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1373 1374 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1375 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1376 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1377 1378 // C++ [class.base.init]p2: 1379 // [...] Unless the mem-initializer-id names a nonstatic data 1380 // member of the constructor’s class or a direct or virtual base 1381 // of that class, the mem-initializer is ill-formed. A 1382 // mem-initializer-list can initialize a base class using any 1383 // name that denotes that base class type. 1384 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1385 1386 // Check for direct and virtual base classes. 1387 const CXXBaseSpecifier *DirectBaseSpec = 0; 1388 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1389 if (!Dependent) { 1390 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1391 VirtualBaseSpec); 1392 1393 // C++ [base.class.init]p2: 1394 // Unless the mem-initializer-id names a nonstatic data member of the 1395 // constructor's class or a direct or virtual base of that class, the 1396 // mem-initializer is ill-formed. 1397 if (!DirectBaseSpec && !VirtualBaseSpec) { 1398 // If the class has any dependent bases, then it's possible that 1399 // one of those types will resolve to the same type as 1400 // BaseType. Therefore, just treat this as a dependent base 1401 // class initialization. FIXME: Should we try to check the 1402 // initialization anyway? It seems odd. 1403 if (ClassDecl->hasAnyDependentBases()) 1404 Dependent = true; 1405 else 1406 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1407 << BaseType << Context.getTypeDeclType(ClassDecl) 1408 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1409 } 1410 } 1411 1412 if (Dependent) { 1413 // Can't check initialization for a base of dependent type or when 1414 // any of the arguments are type-dependent expressions. 1415 OwningExprResult BaseInit 1416 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1417 RParenLoc)); 1418 1419 // Erase any temporaries within this evaluation context; we're not 1420 // going to track them in the AST, since we'll be rebuilding the 1421 // ASTs during template instantiation. 1422 ExprTemporaries.erase( 1423 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1424 ExprTemporaries.end()); 1425 1426 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1427 /*IsVirtual=*/false, 1428 LParenLoc, 1429 BaseInit.takeAs<Expr>(), 1430 RParenLoc); 1431 } 1432 1433 // C++ [base.class.init]p2: 1434 // If a mem-initializer-id is ambiguous because it designates both 1435 // a direct non-virtual base class and an inherited virtual base 1436 // class, the mem-initializer is ill-formed. 1437 if (DirectBaseSpec && VirtualBaseSpec) 1438 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1439 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1440 1441 CXXBaseSpecifier *BaseSpec 1442 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1443 if (!BaseSpec) 1444 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1445 1446 // Initialize the base. 1447 InitializedEntity BaseEntity = 1448 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1449 InitializationKind Kind = 1450 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1451 1452 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1453 1454 OwningExprResult BaseInit = 1455 InitSeq.Perform(*this, BaseEntity, Kind, 1456 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1457 if (BaseInit.isInvalid()) 1458 return true; 1459 1460 // C++0x [class.base.init]p7: 1461 // The initialization of each base and member constitutes a 1462 // full-expression. 1463 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1464 if (BaseInit.isInvalid()) 1465 return true; 1466 1467 // If we are in a dependent context, template instantiation will 1468 // perform this type-checking again. Just save the arguments that we 1469 // received in a ParenListExpr. 1470 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1471 // of the information that we have about the base 1472 // initializer. However, deconstructing the ASTs is a dicey process, 1473 // and this approach is far more likely to get the corner cases right. 1474 if (CurContext->isDependentContext()) { 1475 // Bump the reference count of all of the arguments. 1476 for (unsigned I = 0; I != NumArgs; ++I) 1477 Args[I]->Retain(); 1478 1479 OwningExprResult Init 1480 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1481 RParenLoc)); 1482 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1483 BaseSpec->isVirtual(), 1484 LParenLoc, 1485 Init.takeAs<Expr>(), 1486 RParenLoc); 1487 } 1488 1489 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1490 BaseSpec->isVirtual(), 1491 LParenLoc, 1492 BaseInit.takeAs<Expr>(), 1493 RParenLoc); 1494} 1495 1496/// ImplicitInitializerKind - How an implicit base or member initializer should 1497/// initialize its base or member. 1498enum ImplicitInitializerKind { 1499 IIK_Default, 1500 IIK_Copy, 1501 IIK_Move 1502}; 1503 1504static bool 1505BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1506 ImplicitInitializerKind ImplicitInitKind, 1507 CXXBaseSpecifier *BaseSpec, 1508 bool IsInheritedVirtualBase, 1509 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1510 InitializedEntity InitEntity 1511 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1512 IsInheritedVirtualBase); 1513 1514 Sema::OwningExprResult BaseInit(SemaRef); 1515 1516 switch (ImplicitInitKind) { 1517 case IIK_Default: { 1518 InitializationKind InitKind 1519 = InitializationKind::CreateDefault(Constructor->getLocation()); 1520 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1521 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1522 Sema::MultiExprArg(SemaRef, 0, 0)); 1523 break; 1524 } 1525 1526 case IIK_Copy: { 1527 ParmVarDecl *Param = Constructor->getParamDecl(0); 1528 QualType ParamType = Param->getType().getNonReferenceType(); 1529 1530 Expr *CopyCtorArg = 1531 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1532 Constructor->getLocation(), ParamType, 0); 1533 1534 // Cast to the base class to avoid ambiguities. 1535 QualType ArgTy = 1536 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1537 ParamType.getQualifiers()); 1538 1539 CXXCastPath BasePath; 1540 BasePath.push_back(BaseSpec); 1541 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1542 CastExpr::CK_UncheckedDerivedToBase, 1543 ImplicitCastExpr::LValue, &BasePath); 1544 1545 InitializationKind InitKind 1546 = InitializationKind::CreateDirect(Constructor->getLocation(), 1547 SourceLocation(), SourceLocation()); 1548 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1549 &CopyCtorArg, 1); 1550 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1551 Sema::MultiExprArg(SemaRef, 1552 (void**)&CopyCtorArg, 1)); 1553 break; 1554 } 1555 1556 case IIK_Move: 1557 assert(false && "Unhandled initializer kind!"); 1558 } 1559 1560 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1561 if (BaseInit.isInvalid()) 1562 return true; 1563 1564 CXXBaseInit = 1565 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1566 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1567 SourceLocation()), 1568 BaseSpec->isVirtual(), 1569 SourceLocation(), 1570 BaseInit.takeAs<Expr>(), 1571 SourceLocation()); 1572 1573 return false; 1574} 1575 1576static bool 1577BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1578 ImplicitInitializerKind ImplicitInitKind, 1579 FieldDecl *Field, 1580 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1581 if (Field->isInvalidDecl()) 1582 return true; 1583 1584 SourceLocation Loc = Constructor->getLocation(); 1585 1586 if (ImplicitInitKind == IIK_Copy) { 1587 ParmVarDecl *Param = Constructor->getParamDecl(0); 1588 QualType ParamType = Param->getType().getNonReferenceType(); 1589 1590 Expr *MemberExprBase = 1591 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1592 Loc, ParamType, 0); 1593 1594 // Build a reference to this field within the parameter. 1595 CXXScopeSpec SS; 1596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1597 Sema::LookupMemberName); 1598 MemberLookup.addDecl(Field, AS_public); 1599 MemberLookup.resolveKind(); 1600 Sema::OwningExprResult CopyCtorArg 1601 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1602 ParamType, Loc, 1603 /*IsArrow=*/false, 1604 SS, 1605 /*FirstQualifierInScope=*/0, 1606 MemberLookup, 1607 /*TemplateArgs=*/0); 1608 if (CopyCtorArg.isInvalid()) 1609 return true; 1610 1611 // When the field we are copying is an array, create index variables for 1612 // each dimension of the array. We use these index variables to subscript 1613 // the source array, and other clients (e.g., CodeGen) will perform the 1614 // necessary iteration with these index variables. 1615 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1616 QualType BaseType = Field->getType(); 1617 QualType SizeType = SemaRef.Context.getSizeType(); 1618 while (const ConstantArrayType *Array 1619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1620 // Create the iteration variable for this array index. 1621 IdentifierInfo *IterationVarName = 0; 1622 { 1623 llvm::SmallString<8> Str; 1624 llvm::raw_svector_ostream OS(Str); 1625 OS << "__i" << IndexVariables.size(); 1626 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1627 } 1628 VarDecl *IterationVar 1629 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1630 IterationVarName, SizeType, 1631 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1632 VarDecl::None, VarDecl::None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 Sema::OwningExprResult IterationVarRef 1637 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1638 assert(!IterationVarRef.isInvalid() && 1639 "Reference to invented variable cannot fail!"); 1640 1641 // Subscript the array with this iteration variable. 1642 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1643 Loc, 1644 move(IterationVarRef), 1645 Loc); 1646 if (CopyCtorArg.isInvalid()) 1647 return true; 1648 1649 BaseType = Array->getElementType(); 1650 } 1651 1652 // Construct the entity that we will be initializing. For an array, this 1653 // will be first element in the array, which may require several levels 1654 // of array-subscript entities. 1655 llvm::SmallVector<InitializedEntity, 4> Entities; 1656 Entities.reserve(1 + IndexVariables.size()); 1657 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1658 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1659 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1660 0, 1661 Entities.back())); 1662 1663 // Direct-initialize to use the copy constructor. 1664 InitializationKind InitKind = 1665 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1666 1667 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1668 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1669 &CopyCtorArgE, 1); 1670 1671 Sema::OwningExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1674 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1675 if (MemberInit.isInvalid()) 1676 return true; 1677 1678 CXXMemberInit 1679 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1680 MemberInit.takeAs<Expr>(), Loc, 1681 IndexVariables.data(), 1682 IndexVariables.size()); 1683 return false; 1684 } 1685 1686 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1687 1688 QualType FieldBaseElementType = 1689 SemaRef.Context.getBaseElementType(Field->getType()); 1690 1691 if (FieldBaseElementType->isRecordType()) { 1692 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1693 InitializationKind InitKind = 1694 InitializationKind::CreateDefault(Loc); 1695 1696 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1697 Sema::OwningExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1699 Sema::MultiExprArg(SemaRef, 0, 0)); 1700 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1701 if (MemberInit.isInvalid()) 1702 return true; 1703 1704 CXXMemberInit = 1705 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1706 Field, Loc, Loc, 1707 MemberInit.takeAs<Expr>(), 1708 Loc); 1709 return false; 1710 } 1711 1712 if (FieldBaseElementType->isReferenceType()) { 1713 SemaRef.Diag(Constructor->getLocation(), 1714 diag::err_uninitialized_member_in_ctor) 1715 << (int)Constructor->isImplicit() 1716 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1717 << 0 << Field->getDeclName(); 1718 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1719 return true; 1720 } 1721 1722 if (FieldBaseElementType.isConstQualified()) { 1723 SemaRef.Diag(Constructor->getLocation(), 1724 diag::err_uninitialized_member_in_ctor) 1725 << (int)Constructor->isImplicit() 1726 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1727 << 1 << Field->getDeclName(); 1728 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1729 return true; 1730 } 1731 1732 // Nothing to initialize. 1733 CXXMemberInit = 0; 1734 return false; 1735} 1736 1737namespace { 1738struct BaseAndFieldInfo { 1739 Sema &S; 1740 CXXConstructorDecl *Ctor; 1741 bool AnyErrorsInInits; 1742 ImplicitInitializerKind IIK; 1743 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1744 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1745 1746 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1747 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1748 // FIXME: Handle implicit move constructors. 1749 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1750 IIK = IIK_Copy; 1751 else 1752 IIK = IIK_Default; 1753 } 1754}; 1755} 1756 1757static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1758 FieldDecl *Top, FieldDecl *Field, 1759 CXXBaseOrMemberInitializer *Init) { 1760 // If the member doesn't need to be initialized, Init will still be null. 1761 if (!Init) 1762 return; 1763 1764 Info.AllToInit.push_back(Init); 1765 if (Field != Top) { 1766 Init->setMember(Top); 1767 Init->setAnonUnionMember(Field); 1768 } 1769} 1770 1771static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1772 FieldDecl *Top, FieldDecl *Field) { 1773 1774 // Overwhelmingly common case: we have a direct initializer for this field. 1775 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1776 RecordFieldInitializer(Info, Top, Field, Init); 1777 return false; 1778 } 1779 1780 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1781 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1782 assert(FieldClassType && "anonymous struct/union without record type"); 1783 CXXRecordDecl *FieldClassDecl 1784 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1785 1786 // Even though union members never have non-trivial default 1787 // constructions in C++03, we still build member initializers for aggregate 1788 // record types which can be union members, and C++0x allows non-trivial 1789 // default constructors for union members, so we ensure that only one 1790 // member is initialized for these. 1791 if (FieldClassDecl->isUnion()) { 1792 // First check for an explicit initializer for one field. 1793 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1794 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1795 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1796 RecordFieldInitializer(Info, Top, *FA, Init); 1797 1798 // Once we've initialized a field of an anonymous union, the union 1799 // field in the class is also initialized, so exit immediately. 1800 return false; 1801 } 1802 } 1803 1804 // Fallthrough and construct a default initializer for the union as 1805 // a whole, which can call its default constructor if such a thing exists 1806 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1807 // behavior going forward with C++0x, when anonymous unions there are 1808 // finalized, we should revisit this. 1809 } else { 1810 // For structs, we simply descend through to initialize all members where 1811 // necessary. 1812 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1813 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1814 if (CollectFieldInitializer(Info, Top, *FA)) 1815 return true; 1816 } 1817 } 1818 } 1819 1820 // Don't try to build an implicit initializer if there were semantic 1821 // errors in any of the initializers (and therefore we might be 1822 // missing some that the user actually wrote). 1823 if (Info.AnyErrorsInInits) 1824 return false; 1825 1826 CXXBaseOrMemberInitializer *Init = 0; 1827 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1828 return true; 1829 1830 RecordFieldInitializer(Info, Top, Field, Init); 1831 return false; 1832} 1833 1834bool 1835Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1836 CXXBaseOrMemberInitializer **Initializers, 1837 unsigned NumInitializers, 1838 bool AnyErrors) { 1839 if (Constructor->getDeclContext()->isDependentContext()) { 1840 // Just store the initializers as written, they will be checked during 1841 // instantiation. 1842 if (NumInitializers > 0) { 1843 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1844 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1845 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1846 memcpy(baseOrMemberInitializers, Initializers, 1847 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1848 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1849 } 1850 1851 return false; 1852 } 1853 1854 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1855 1856 // We need to build the initializer AST according to order of construction 1857 // and not what user specified in the Initializers list. 1858 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1859 if (!ClassDecl) 1860 return true; 1861 1862 bool HadError = false; 1863 1864 for (unsigned i = 0; i < NumInitializers; i++) { 1865 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1866 1867 if (Member->isBaseInitializer()) 1868 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1869 else 1870 Info.AllBaseFields[Member->getMember()] = Member; 1871 } 1872 1873 // Keep track of the direct virtual bases. 1874 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1875 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1876 E = ClassDecl->bases_end(); I != E; ++I) { 1877 if (I->isVirtual()) 1878 DirectVBases.insert(I); 1879 } 1880 1881 // Push virtual bases before others. 1882 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1883 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1884 1885 if (CXXBaseOrMemberInitializer *Value 1886 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1887 Info.AllToInit.push_back(Value); 1888 } else if (!AnyErrors) { 1889 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1890 CXXBaseOrMemberInitializer *CXXBaseInit; 1891 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1892 VBase, IsInheritedVirtualBase, 1893 CXXBaseInit)) { 1894 HadError = true; 1895 continue; 1896 } 1897 1898 Info.AllToInit.push_back(CXXBaseInit); 1899 } 1900 } 1901 1902 // Non-virtual bases. 1903 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1904 E = ClassDecl->bases_end(); Base != E; ++Base) { 1905 // Virtuals are in the virtual base list and already constructed. 1906 if (Base->isVirtual()) 1907 continue; 1908 1909 if (CXXBaseOrMemberInitializer *Value 1910 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1911 Info.AllToInit.push_back(Value); 1912 } else if (!AnyErrors) { 1913 CXXBaseOrMemberInitializer *CXXBaseInit; 1914 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1915 Base, /*IsInheritedVirtualBase=*/false, 1916 CXXBaseInit)) { 1917 HadError = true; 1918 continue; 1919 } 1920 1921 Info.AllToInit.push_back(CXXBaseInit); 1922 } 1923 } 1924 1925 // Fields. 1926 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1927 E = ClassDecl->field_end(); Field != E; ++Field) { 1928 if ((*Field)->getType()->isIncompleteArrayType()) { 1929 assert(ClassDecl->hasFlexibleArrayMember() && 1930 "Incomplete array type is not valid"); 1931 continue; 1932 } 1933 if (CollectFieldInitializer(Info, *Field, *Field)) 1934 HadError = true; 1935 } 1936 1937 NumInitializers = Info.AllToInit.size(); 1938 if (NumInitializers > 0) { 1939 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1940 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1941 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1942 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1943 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1944 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1945 1946 // Constructors implicitly reference the base and member 1947 // destructors. 1948 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1949 Constructor->getParent()); 1950 } 1951 1952 return HadError; 1953} 1954 1955static void *GetKeyForTopLevelField(FieldDecl *Field) { 1956 // For anonymous unions, use the class declaration as the key. 1957 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1958 if (RT->getDecl()->isAnonymousStructOrUnion()) 1959 return static_cast<void *>(RT->getDecl()); 1960 } 1961 return static_cast<void *>(Field); 1962} 1963 1964static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1965 return Context.getCanonicalType(BaseType).getTypePtr(); 1966} 1967 1968static void *GetKeyForMember(ASTContext &Context, 1969 CXXBaseOrMemberInitializer *Member, 1970 bool MemberMaybeAnon = false) { 1971 if (!Member->isMemberInitializer()) 1972 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1973 1974 // For fields injected into the class via declaration of an anonymous union, 1975 // use its anonymous union class declaration as the unique key. 1976 FieldDecl *Field = Member->getMember(); 1977 1978 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1979 // data member of the class. Data member used in the initializer list is 1980 // in AnonUnionMember field. 1981 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1982 Field = Member->getAnonUnionMember(); 1983 1984 // If the field is a member of an anonymous struct or union, our key 1985 // is the anonymous record decl that's a direct child of the class. 1986 RecordDecl *RD = Field->getParent(); 1987 if (RD->isAnonymousStructOrUnion()) { 1988 while (true) { 1989 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1990 if (Parent->isAnonymousStructOrUnion()) 1991 RD = Parent; 1992 else 1993 break; 1994 } 1995 1996 return static_cast<void *>(RD); 1997 } 1998 1999 return static_cast<void *>(Field); 2000} 2001 2002static void 2003DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2004 const CXXConstructorDecl *Constructor, 2005 CXXBaseOrMemberInitializer **Inits, 2006 unsigned NumInits) { 2007 if (Constructor->getDeclContext()->isDependentContext()) 2008 return; 2009 2010 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2011 == Diagnostic::Ignored) 2012 return; 2013 2014 // Build the list of bases and members in the order that they'll 2015 // actually be initialized. The explicit initializers should be in 2016 // this same order but may be missing things. 2017 llvm::SmallVector<const void*, 32> IdealInitKeys; 2018 2019 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2020 2021 // 1. Virtual bases. 2022 for (CXXRecordDecl::base_class_const_iterator VBase = 2023 ClassDecl->vbases_begin(), 2024 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2025 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2026 2027 // 2. Non-virtual bases. 2028 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2029 E = ClassDecl->bases_end(); Base != E; ++Base) { 2030 if (Base->isVirtual()) 2031 continue; 2032 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2033 } 2034 2035 // 3. Direct fields. 2036 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2037 E = ClassDecl->field_end(); Field != E; ++Field) 2038 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2039 2040 unsigned NumIdealInits = IdealInitKeys.size(); 2041 unsigned IdealIndex = 0; 2042 2043 CXXBaseOrMemberInitializer *PrevInit = 0; 2044 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2045 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2046 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2047 2048 // Scan forward to try to find this initializer in the idealized 2049 // initializers list. 2050 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2051 if (InitKey == IdealInitKeys[IdealIndex]) 2052 break; 2053 2054 // If we didn't find this initializer, it must be because we 2055 // scanned past it on a previous iteration. That can only 2056 // happen if we're out of order; emit a warning. 2057 if (IdealIndex == NumIdealInits && PrevInit) { 2058 Sema::SemaDiagnosticBuilder D = 2059 SemaRef.Diag(PrevInit->getSourceLocation(), 2060 diag::warn_initializer_out_of_order); 2061 2062 if (PrevInit->isMemberInitializer()) 2063 D << 0 << PrevInit->getMember()->getDeclName(); 2064 else 2065 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2066 2067 if (Init->isMemberInitializer()) 2068 D << 0 << Init->getMember()->getDeclName(); 2069 else 2070 D << 1 << Init->getBaseClassInfo()->getType(); 2071 2072 // Move back to the initializer's location in the ideal list. 2073 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2074 if (InitKey == IdealInitKeys[IdealIndex]) 2075 break; 2076 2077 assert(IdealIndex != NumIdealInits && 2078 "initializer not found in initializer list"); 2079 } 2080 2081 PrevInit = Init; 2082 } 2083} 2084 2085namespace { 2086bool CheckRedundantInit(Sema &S, 2087 CXXBaseOrMemberInitializer *Init, 2088 CXXBaseOrMemberInitializer *&PrevInit) { 2089 if (!PrevInit) { 2090 PrevInit = Init; 2091 return false; 2092 } 2093 2094 if (FieldDecl *Field = Init->getMember()) 2095 S.Diag(Init->getSourceLocation(), 2096 diag::err_multiple_mem_initialization) 2097 << Field->getDeclName() 2098 << Init->getSourceRange(); 2099 else { 2100 Type *BaseClass = Init->getBaseClass(); 2101 assert(BaseClass && "neither field nor base"); 2102 S.Diag(Init->getSourceLocation(), 2103 diag::err_multiple_base_initialization) 2104 << QualType(BaseClass, 0) 2105 << Init->getSourceRange(); 2106 } 2107 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2108 << 0 << PrevInit->getSourceRange(); 2109 2110 return true; 2111} 2112 2113typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2114typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2115 2116bool CheckRedundantUnionInit(Sema &S, 2117 CXXBaseOrMemberInitializer *Init, 2118 RedundantUnionMap &Unions) { 2119 FieldDecl *Field = Init->getMember(); 2120 RecordDecl *Parent = Field->getParent(); 2121 if (!Parent->isAnonymousStructOrUnion()) 2122 return false; 2123 2124 NamedDecl *Child = Field; 2125 do { 2126 if (Parent->isUnion()) { 2127 UnionEntry &En = Unions[Parent]; 2128 if (En.first && En.first != Child) { 2129 S.Diag(Init->getSourceLocation(), 2130 diag::err_multiple_mem_union_initialization) 2131 << Field->getDeclName() 2132 << Init->getSourceRange(); 2133 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2134 << 0 << En.second->getSourceRange(); 2135 return true; 2136 } else if (!En.first) { 2137 En.first = Child; 2138 En.second = Init; 2139 } 2140 } 2141 2142 Child = Parent; 2143 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2144 } while (Parent->isAnonymousStructOrUnion()); 2145 2146 return false; 2147} 2148} 2149 2150/// ActOnMemInitializers - Handle the member initializers for a constructor. 2151void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2152 SourceLocation ColonLoc, 2153 MemInitTy **meminits, unsigned NumMemInits, 2154 bool AnyErrors) { 2155 if (!ConstructorDecl) 2156 return; 2157 2158 AdjustDeclIfTemplate(ConstructorDecl); 2159 2160 CXXConstructorDecl *Constructor 2161 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2162 2163 if (!Constructor) { 2164 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2165 return; 2166 } 2167 2168 CXXBaseOrMemberInitializer **MemInits = 2169 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2170 2171 // Mapping for the duplicate initializers check. 2172 // For member initializers, this is keyed with a FieldDecl*. 2173 // For base initializers, this is keyed with a Type*. 2174 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2175 2176 // Mapping for the inconsistent anonymous-union initializers check. 2177 RedundantUnionMap MemberUnions; 2178 2179 bool HadError = false; 2180 for (unsigned i = 0; i < NumMemInits; i++) { 2181 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2182 2183 // Set the source order index. 2184 Init->setSourceOrder(i); 2185 2186 if (Init->isMemberInitializer()) { 2187 FieldDecl *Field = Init->getMember(); 2188 if (CheckRedundantInit(*this, Init, Members[Field]) || 2189 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2190 HadError = true; 2191 } else { 2192 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2193 if (CheckRedundantInit(*this, Init, Members[Key])) 2194 HadError = true; 2195 } 2196 } 2197 2198 if (HadError) 2199 return; 2200 2201 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2202 2203 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2204} 2205 2206void 2207Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2208 CXXRecordDecl *ClassDecl) { 2209 // Ignore dependent contexts. 2210 if (ClassDecl->isDependentContext()) 2211 return; 2212 2213 // FIXME: all the access-control diagnostics are positioned on the 2214 // field/base declaration. That's probably good; that said, the 2215 // user might reasonably want to know why the destructor is being 2216 // emitted, and we currently don't say. 2217 2218 // Non-static data members. 2219 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2220 E = ClassDecl->field_end(); I != E; ++I) { 2221 FieldDecl *Field = *I; 2222 if (Field->isInvalidDecl()) 2223 continue; 2224 QualType FieldType = Context.getBaseElementType(Field->getType()); 2225 2226 const RecordType* RT = FieldType->getAs<RecordType>(); 2227 if (!RT) 2228 continue; 2229 2230 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2231 if (FieldClassDecl->hasTrivialDestructor()) 2232 continue; 2233 2234 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2235 CheckDestructorAccess(Field->getLocation(), Dtor, 2236 PDiag(diag::err_access_dtor_field) 2237 << Field->getDeclName() 2238 << FieldType); 2239 2240 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2241 } 2242 2243 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2244 2245 // Bases. 2246 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2247 E = ClassDecl->bases_end(); Base != E; ++Base) { 2248 // Bases are always records in a well-formed non-dependent class. 2249 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2250 2251 // Remember direct virtual bases. 2252 if (Base->isVirtual()) 2253 DirectVirtualBases.insert(RT); 2254 2255 // Ignore trivial destructors. 2256 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2257 if (BaseClassDecl->hasTrivialDestructor()) 2258 continue; 2259 2260 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2261 2262 // FIXME: caret should be on the start of the class name 2263 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2264 PDiag(diag::err_access_dtor_base) 2265 << Base->getType() 2266 << Base->getSourceRange()); 2267 2268 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2269 } 2270 2271 // Virtual bases. 2272 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2273 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2274 2275 // Bases are always records in a well-formed non-dependent class. 2276 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2277 2278 // Ignore direct virtual bases. 2279 if (DirectVirtualBases.count(RT)) 2280 continue; 2281 2282 // Ignore trivial destructors. 2283 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2284 if (BaseClassDecl->hasTrivialDestructor()) 2285 continue; 2286 2287 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2288 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2289 PDiag(diag::err_access_dtor_vbase) 2290 << VBase->getType()); 2291 2292 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2293 } 2294} 2295 2296void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2297 if (!CDtorDecl) 2298 return; 2299 2300 if (CXXConstructorDecl *Constructor 2301 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2302 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2303} 2304 2305bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2306 unsigned DiagID, AbstractDiagSelID SelID, 2307 const CXXRecordDecl *CurrentRD) { 2308 if (SelID == -1) 2309 return RequireNonAbstractType(Loc, T, 2310 PDiag(DiagID), CurrentRD); 2311 else 2312 return RequireNonAbstractType(Loc, T, 2313 PDiag(DiagID) << SelID, CurrentRD); 2314} 2315 2316bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2317 const PartialDiagnostic &PD, 2318 const CXXRecordDecl *CurrentRD) { 2319 if (!getLangOptions().CPlusPlus) 2320 return false; 2321 2322 if (const ArrayType *AT = Context.getAsArrayType(T)) 2323 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2324 CurrentRD); 2325 2326 if (const PointerType *PT = T->getAs<PointerType>()) { 2327 // Find the innermost pointer type. 2328 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2329 PT = T; 2330 2331 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2332 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2333 } 2334 2335 const RecordType *RT = T->getAs<RecordType>(); 2336 if (!RT) 2337 return false; 2338 2339 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2340 2341 if (CurrentRD && CurrentRD != RD) 2342 return false; 2343 2344 // FIXME: is this reasonable? It matches current behavior, but.... 2345 if (!RD->getDefinition()) 2346 return false; 2347 2348 if (!RD->isAbstract()) 2349 return false; 2350 2351 Diag(Loc, PD) << RD->getDeclName(); 2352 2353 // Check if we've already emitted the list of pure virtual functions for this 2354 // class. 2355 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2356 return true; 2357 2358 CXXFinalOverriderMap FinalOverriders; 2359 RD->getFinalOverriders(FinalOverriders); 2360 2361 // Keep a set of seen pure methods so we won't diagnose the same method 2362 // more than once. 2363 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2364 2365 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2366 MEnd = FinalOverriders.end(); 2367 M != MEnd; 2368 ++M) { 2369 for (OverridingMethods::iterator SO = M->second.begin(), 2370 SOEnd = M->second.end(); 2371 SO != SOEnd; ++SO) { 2372 // C++ [class.abstract]p4: 2373 // A class is abstract if it contains or inherits at least one 2374 // pure virtual function for which the final overrider is pure 2375 // virtual. 2376 2377 // 2378 if (SO->second.size() != 1) 2379 continue; 2380 2381 if (!SO->second.front().Method->isPure()) 2382 continue; 2383 2384 if (!SeenPureMethods.insert(SO->second.front().Method)) 2385 continue; 2386 2387 Diag(SO->second.front().Method->getLocation(), 2388 diag::note_pure_virtual_function) 2389 << SO->second.front().Method->getDeclName(); 2390 } 2391 } 2392 2393 if (!PureVirtualClassDiagSet) 2394 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2395 PureVirtualClassDiagSet->insert(RD); 2396 2397 return true; 2398} 2399 2400namespace { 2401 class AbstractClassUsageDiagnoser 2402 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2403 Sema &SemaRef; 2404 CXXRecordDecl *AbstractClass; 2405 2406 bool VisitDeclContext(const DeclContext *DC) { 2407 bool Invalid = false; 2408 2409 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2410 E = DC->decls_end(); I != E; ++I) 2411 Invalid |= Visit(*I); 2412 2413 return Invalid; 2414 } 2415 2416 public: 2417 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2418 : SemaRef(SemaRef), AbstractClass(ac) { 2419 Visit(SemaRef.Context.getTranslationUnitDecl()); 2420 } 2421 2422 bool VisitFunctionDecl(const FunctionDecl *FD) { 2423 if (FD->isThisDeclarationADefinition()) { 2424 // No need to do the check if we're in a definition, because it requires 2425 // that the return/param types are complete. 2426 // because that requires 2427 return VisitDeclContext(FD); 2428 } 2429 2430 // Check the return type. 2431 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2432 bool Invalid = 2433 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2434 diag::err_abstract_type_in_decl, 2435 Sema::AbstractReturnType, 2436 AbstractClass); 2437 2438 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2439 E = FD->param_end(); I != E; ++I) { 2440 const ParmVarDecl *VD = *I; 2441 Invalid |= 2442 SemaRef.RequireNonAbstractType(VD->getLocation(), 2443 VD->getOriginalType(), 2444 diag::err_abstract_type_in_decl, 2445 Sema::AbstractParamType, 2446 AbstractClass); 2447 } 2448 2449 return Invalid; 2450 } 2451 2452 bool VisitDecl(const Decl* D) { 2453 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2454 return VisitDeclContext(DC); 2455 2456 return false; 2457 } 2458 }; 2459} 2460 2461/// \brief Perform semantic checks on a class definition that has been 2462/// completing, introducing implicitly-declared members, checking for 2463/// abstract types, etc. 2464void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2465 if (!Record || Record->isInvalidDecl()) 2466 return; 2467 2468 if (!Record->isDependentType()) 2469 AddImplicitlyDeclaredMembersToClass(Record); 2470 2471 if (Record->isInvalidDecl()) 2472 return; 2473 2474 // Set access bits correctly on the directly-declared conversions. 2475 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2476 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2477 Convs->setAccess(I, (*I)->getAccess()); 2478 2479 // Determine whether we need to check for final overriders. We do 2480 // this either when there are virtual base classes (in which case we 2481 // may end up finding multiple final overriders for a given virtual 2482 // function) or any of the base classes is abstract (in which case 2483 // we might detect that this class is abstract). 2484 bool CheckFinalOverriders = false; 2485 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2486 !Record->isDependentType()) { 2487 if (Record->getNumVBases()) 2488 CheckFinalOverriders = true; 2489 else if (!Record->isAbstract()) { 2490 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2491 BEnd = Record->bases_end(); 2492 B != BEnd; ++B) { 2493 CXXRecordDecl *BaseDecl 2494 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2495 if (BaseDecl->isAbstract()) { 2496 CheckFinalOverriders = true; 2497 break; 2498 } 2499 } 2500 } 2501 } 2502 2503 if (CheckFinalOverriders) { 2504 CXXFinalOverriderMap FinalOverriders; 2505 Record->getFinalOverriders(FinalOverriders); 2506 2507 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2508 MEnd = FinalOverriders.end(); 2509 M != MEnd; ++M) { 2510 for (OverridingMethods::iterator SO = M->second.begin(), 2511 SOEnd = M->second.end(); 2512 SO != SOEnd; ++SO) { 2513 assert(SO->second.size() > 0 && 2514 "All virtual functions have overridding virtual functions"); 2515 if (SO->second.size() == 1) { 2516 // C++ [class.abstract]p4: 2517 // A class is abstract if it contains or inherits at least one 2518 // pure virtual function for which the final overrider is pure 2519 // virtual. 2520 if (SO->second.front().Method->isPure()) 2521 Record->setAbstract(true); 2522 continue; 2523 } 2524 2525 // C++ [class.virtual]p2: 2526 // In a derived class, if a virtual member function of a base 2527 // class subobject has more than one final overrider the 2528 // program is ill-formed. 2529 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2530 << (NamedDecl *)M->first << Record; 2531 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2532 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2533 OMEnd = SO->second.end(); 2534 OM != OMEnd; ++OM) 2535 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2536 << (NamedDecl *)M->first << OM->Method->getParent(); 2537 2538 Record->setInvalidDecl(); 2539 } 2540 } 2541 } 2542 2543 if (Record->isAbstract() && !Record->isInvalidDecl()) 2544 (void)AbstractClassUsageDiagnoser(*this, Record); 2545 2546 // If this is not an aggregate type and has no user-declared constructor, 2547 // complain about any non-static data members of reference or const scalar 2548 // type, since they will never get initializers. 2549 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2550 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2551 bool Complained = false; 2552 for (RecordDecl::field_iterator F = Record->field_begin(), 2553 FEnd = Record->field_end(); 2554 F != FEnd; ++F) { 2555 if (F->getType()->isReferenceType() || 2556 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2557 if (!Complained) { 2558 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2559 << Record->getTagKind() << Record; 2560 Complained = true; 2561 } 2562 2563 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2564 << F->getType()->isReferenceType() 2565 << F->getDeclName(); 2566 } 2567 } 2568 } 2569 2570 if (Record->isDynamicClass()) 2571 DynamicClasses.push_back(Record); 2572} 2573 2574void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2575 DeclPtrTy TagDecl, 2576 SourceLocation LBrac, 2577 SourceLocation RBrac, 2578 AttributeList *AttrList) { 2579 if (!TagDecl) 2580 return; 2581 2582 AdjustDeclIfTemplate(TagDecl); 2583 2584 ActOnFields(S, RLoc, TagDecl, 2585 (DeclPtrTy*)FieldCollector->getCurFields(), 2586 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2587 2588 CheckCompletedCXXClass( 2589 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2590} 2591 2592namespace { 2593 /// \brief Helper class that collects exception specifications for 2594 /// implicitly-declared special member functions. 2595 class ImplicitExceptionSpecification { 2596 ASTContext &Context; 2597 bool AllowsAllExceptions; 2598 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2599 llvm::SmallVector<QualType, 4> Exceptions; 2600 2601 public: 2602 explicit ImplicitExceptionSpecification(ASTContext &Context) 2603 : Context(Context), AllowsAllExceptions(false) { } 2604 2605 /// \brief Whether the special member function should have any 2606 /// exception specification at all. 2607 bool hasExceptionSpecification() const { 2608 return !AllowsAllExceptions; 2609 } 2610 2611 /// \brief Whether the special member function should have a 2612 /// throw(...) exception specification (a Microsoft extension). 2613 bool hasAnyExceptionSpecification() const { 2614 return false; 2615 } 2616 2617 /// \brief The number of exceptions in the exception specification. 2618 unsigned size() const { return Exceptions.size(); } 2619 2620 /// \brief The set of exceptions in the exception specification. 2621 const QualType *data() const { return Exceptions.data(); } 2622 2623 /// \brief Note that 2624 void CalledDecl(CXXMethodDecl *Method) { 2625 // If we already know that we allow all exceptions, do nothing. 2626 if (AllowsAllExceptions || !Method) 2627 return; 2628 2629 const FunctionProtoType *Proto 2630 = Method->getType()->getAs<FunctionProtoType>(); 2631 2632 // If this function can throw any exceptions, make a note of that. 2633 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2634 AllowsAllExceptions = true; 2635 ExceptionsSeen.clear(); 2636 Exceptions.clear(); 2637 return; 2638 } 2639 2640 // Record the exceptions in this function's exception specification. 2641 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2642 EEnd = Proto->exception_end(); 2643 E != EEnd; ++E) 2644 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2645 Exceptions.push_back(*E); 2646 } 2647 }; 2648} 2649 2650 2651/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2652/// special functions, such as the default constructor, copy 2653/// constructor, or destructor, to the given C++ class (C++ 2654/// [special]p1). This routine can only be executed just before the 2655/// definition of the class is complete. 2656void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2657 if (!ClassDecl->hasUserDeclaredConstructor()) 2658 ++ASTContext::NumImplicitDefaultConstructors; 2659 2660 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2661 ++ASTContext::NumImplicitCopyConstructors; 2662 2663 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2664 ++ASTContext::NumImplicitCopyAssignmentOperators; 2665 2666 // If we have a dynamic class, then the copy assignment operator may be 2667 // virtual, so we have to declare it immediately. This ensures that, e.g., 2668 // it shows up in the right place in the vtable and that we diagnose 2669 // problems with the implicit exception specification. 2670 if (ClassDecl->isDynamicClass()) 2671 DeclareImplicitCopyAssignment(ClassDecl); 2672 } 2673 2674 if (!ClassDecl->hasUserDeclaredDestructor()) { 2675 ++ASTContext::NumImplicitDestructors; 2676 2677 // If we have a dynamic class, then the destructor may be virtual, so we 2678 // have to declare the destructor immediately. This ensures that, e.g., it 2679 // shows up in the right place in the vtable and that we diagnose problems 2680 // with the implicit exception specification. 2681 if (ClassDecl->isDynamicClass()) 2682 DeclareImplicitDestructor(ClassDecl); 2683 } 2684} 2685 2686void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2687 Decl *D = TemplateD.getAs<Decl>(); 2688 if (!D) 2689 return; 2690 2691 TemplateParameterList *Params = 0; 2692 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2693 Params = Template->getTemplateParameters(); 2694 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2695 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2696 Params = PartialSpec->getTemplateParameters(); 2697 else 2698 return; 2699 2700 for (TemplateParameterList::iterator Param = Params->begin(), 2701 ParamEnd = Params->end(); 2702 Param != ParamEnd; ++Param) { 2703 NamedDecl *Named = cast<NamedDecl>(*Param); 2704 if (Named->getDeclName()) { 2705 S->AddDecl(DeclPtrTy::make(Named)); 2706 IdResolver.AddDecl(Named); 2707 } 2708 } 2709} 2710 2711void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2712 if (!RecordD) return; 2713 AdjustDeclIfTemplate(RecordD); 2714 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2715 PushDeclContext(S, Record); 2716} 2717 2718void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2719 if (!RecordD) return; 2720 PopDeclContext(); 2721} 2722 2723/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2724/// parsing a top-level (non-nested) C++ class, and we are now 2725/// parsing those parts of the given Method declaration that could 2726/// not be parsed earlier (C++ [class.mem]p2), such as default 2727/// arguments. This action should enter the scope of the given 2728/// Method declaration as if we had just parsed the qualified method 2729/// name. However, it should not bring the parameters into scope; 2730/// that will be performed by ActOnDelayedCXXMethodParameter. 2731void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2732} 2733 2734/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2735/// C++ method declaration. We're (re-)introducing the given 2736/// function parameter into scope for use in parsing later parts of 2737/// the method declaration. For example, we could see an 2738/// ActOnParamDefaultArgument event for this parameter. 2739void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2740 if (!ParamD) 2741 return; 2742 2743 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2744 2745 // If this parameter has an unparsed default argument, clear it out 2746 // to make way for the parsed default argument. 2747 if (Param->hasUnparsedDefaultArg()) 2748 Param->setDefaultArg(0); 2749 2750 S->AddDecl(DeclPtrTy::make(Param)); 2751 if (Param->getDeclName()) 2752 IdResolver.AddDecl(Param); 2753} 2754 2755/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2756/// processing the delayed method declaration for Method. The method 2757/// declaration is now considered finished. There may be a separate 2758/// ActOnStartOfFunctionDef action later (not necessarily 2759/// immediately!) for this method, if it was also defined inside the 2760/// class body. 2761void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2762 if (!MethodD) 2763 return; 2764 2765 AdjustDeclIfTemplate(MethodD); 2766 2767 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2768 2769 // Now that we have our default arguments, check the constructor 2770 // again. It could produce additional diagnostics or affect whether 2771 // the class has implicitly-declared destructors, among other 2772 // things. 2773 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2774 CheckConstructor(Constructor); 2775 2776 // Check the default arguments, which we may have added. 2777 if (!Method->isInvalidDecl()) 2778 CheckCXXDefaultArguments(Method); 2779} 2780 2781/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2782/// the well-formedness of the constructor declarator @p D with type @p 2783/// R. If there are any errors in the declarator, this routine will 2784/// emit diagnostics and set the invalid bit to true. In any case, the type 2785/// will be updated to reflect a well-formed type for the constructor and 2786/// returned. 2787QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2788 FunctionDecl::StorageClass &SC) { 2789 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2790 2791 // C++ [class.ctor]p3: 2792 // A constructor shall not be virtual (10.3) or static (9.4). A 2793 // constructor can be invoked for a const, volatile or const 2794 // volatile object. A constructor shall not be declared const, 2795 // volatile, or const volatile (9.3.2). 2796 if (isVirtual) { 2797 if (!D.isInvalidType()) 2798 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2799 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2800 << SourceRange(D.getIdentifierLoc()); 2801 D.setInvalidType(); 2802 } 2803 if (SC == FunctionDecl::Static) { 2804 if (!D.isInvalidType()) 2805 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2806 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2807 << SourceRange(D.getIdentifierLoc()); 2808 D.setInvalidType(); 2809 SC = FunctionDecl::None; 2810 } 2811 2812 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2813 if (FTI.TypeQuals != 0) { 2814 if (FTI.TypeQuals & Qualifiers::Const) 2815 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2816 << "const" << SourceRange(D.getIdentifierLoc()); 2817 if (FTI.TypeQuals & Qualifiers::Volatile) 2818 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2819 << "volatile" << SourceRange(D.getIdentifierLoc()); 2820 if (FTI.TypeQuals & Qualifiers::Restrict) 2821 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2822 << "restrict" << SourceRange(D.getIdentifierLoc()); 2823 } 2824 2825 // Rebuild the function type "R" without any type qualifiers (in 2826 // case any of the errors above fired) and with "void" as the 2827 // return type, since constructors don't have return types. 2828 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2829 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2830 Proto->getNumArgs(), 2831 Proto->isVariadic(), 0, 2832 Proto->hasExceptionSpec(), 2833 Proto->hasAnyExceptionSpec(), 2834 Proto->getNumExceptions(), 2835 Proto->exception_begin(), 2836 Proto->getExtInfo()); 2837} 2838 2839/// CheckConstructor - Checks a fully-formed constructor for 2840/// well-formedness, issuing any diagnostics required. Returns true if 2841/// the constructor declarator is invalid. 2842void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2843 CXXRecordDecl *ClassDecl 2844 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2845 if (!ClassDecl) 2846 return Constructor->setInvalidDecl(); 2847 2848 // C++ [class.copy]p3: 2849 // A declaration of a constructor for a class X is ill-formed if 2850 // its first parameter is of type (optionally cv-qualified) X and 2851 // either there are no other parameters or else all other 2852 // parameters have default arguments. 2853 if (!Constructor->isInvalidDecl() && 2854 ((Constructor->getNumParams() == 1) || 2855 (Constructor->getNumParams() > 1 && 2856 Constructor->getParamDecl(1)->hasDefaultArg())) && 2857 Constructor->getTemplateSpecializationKind() 2858 != TSK_ImplicitInstantiation) { 2859 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2860 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2861 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2862 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2863 const char *ConstRef 2864 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2865 : " const &"; 2866 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2867 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 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 definition for 2884/// well-formedness, issuing any diagnostics required. Returns true 2885/// on error. 2886bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2887 CXXRecordDecl *RD = Destructor->getParent(); 2888 2889 if (Destructor->isVirtual()) { 2890 SourceLocation Loc; 2891 2892 if (!Destructor->isImplicit()) 2893 Loc = Destructor->getLocation(); 2894 else 2895 Loc = RD->getLocation(); 2896 2897 // If we have a virtual destructor, look up the deallocation function 2898 FunctionDecl *OperatorDelete = 0; 2899 DeclarationName Name = 2900 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2901 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2902 return true; 2903 2904 MarkDeclarationReferenced(Loc, OperatorDelete); 2905 2906 Destructor->setOperatorDelete(OperatorDelete); 2907 } 2908 2909 return false; 2910} 2911 2912static inline bool 2913FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2914 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2915 FTI.ArgInfo[0].Param && 2916 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2917} 2918 2919/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2920/// the well-formednes of the destructor declarator @p D with type @p 2921/// R. If there are any errors in the declarator, this routine will 2922/// emit diagnostics and set the declarator to invalid. Even if this happens, 2923/// will be updated to reflect a well-formed type for the destructor and 2924/// returned. 2925QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2926 FunctionDecl::StorageClass& SC) { 2927 // C++ [class.dtor]p1: 2928 // [...] A typedef-name that names a class is a class-name 2929 // (7.1.3); however, a typedef-name that names a class shall not 2930 // be used as the identifier in the declarator for a destructor 2931 // declaration. 2932 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2933 if (isa<TypedefType>(DeclaratorType)) 2934 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2935 << DeclaratorType; 2936 2937 // C++ [class.dtor]p2: 2938 // A destructor is used to destroy objects of its class type. A 2939 // destructor takes no parameters, and no return type can be 2940 // specified for it (not even void). The address of a destructor 2941 // shall not be taken. A destructor shall not be static. A 2942 // destructor can be invoked for a const, volatile or const 2943 // volatile object. A destructor shall not be declared const, 2944 // volatile or const volatile (9.3.2). 2945 if (SC == FunctionDecl::Static) { 2946 if (!D.isInvalidType()) 2947 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2948 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2949 << SourceRange(D.getIdentifierLoc()) 2950 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2951 2952 SC = FunctionDecl::None; 2953 } 2954 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2955 // Destructors don't have return types, but the parser will 2956 // happily parse something like: 2957 // 2958 // class X { 2959 // float ~X(); 2960 // }; 2961 // 2962 // The return type will be eliminated later. 2963 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2964 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2965 << SourceRange(D.getIdentifierLoc()); 2966 } 2967 2968 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2969 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2970 if (FTI.TypeQuals & Qualifiers::Const) 2971 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2972 << "const" << SourceRange(D.getIdentifierLoc()); 2973 if (FTI.TypeQuals & Qualifiers::Volatile) 2974 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2975 << "volatile" << SourceRange(D.getIdentifierLoc()); 2976 if (FTI.TypeQuals & Qualifiers::Restrict) 2977 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2978 << "restrict" << SourceRange(D.getIdentifierLoc()); 2979 D.setInvalidType(); 2980 } 2981 2982 // Make sure we don't have any parameters. 2983 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2984 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2985 2986 // Delete the parameters. 2987 FTI.freeArgs(); 2988 D.setInvalidType(); 2989 } 2990 2991 // Make sure the destructor isn't variadic. 2992 if (FTI.isVariadic) { 2993 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2994 D.setInvalidType(); 2995 } 2996 2997 // Rebuild the function type "R" without any type qualifiers or 2998 // parameters (in case any of the errors above fired) and with 2999 // "void" as the return type, since destructors don't have return 3000 // types. 3001 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3002 if (!Proto) 3003 return QualType(); 3004 3005 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3006 Proto->hasExceptionSpec(), 3007 Proto->hasAnyExceptionSpec(), 3008 Proto->getNumExceptions(), 3009 Proto->exception_begin(), 3010 Proto->getExtInfo()); 3011} 3012 3013/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3014/// well-formednes of the conversion function declarator @p D with 3015/// type @p R. If there are any errors in the declarator, this routine 3016/// will emit diagnostics and return true. Otherwise, it will return 3017/// false. Either way, the type @p R will be updated to reflect a 3018/// well-formed type for the conversion operator. 3019void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3020 FunctionDecl::StorageClass& SC) { 3021 // C++ [class.conv.fct]p1: 3022 // Neither parameter types nor return type can be specified. The 3023 // type of a conversion function (8.3.5) is "function taking no 3024 // parameter returning conversion-type-id." 3025 if (SC == FunctionDecl::Static) { 3026 if (!D.isInvalidType()) 3027 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3028 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3029 << SourceRange(D.getIdentifierLoc()); 3030 D.setInvalidType(); 3031 SC = FunctionDecl::None; 3032 } 3033 3034 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3035 3036 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3037 // Conversion functions don't have return types, but the parser will 3038 // happily parse something like: 3039 // 3040 // class X { 3041 // float operator bool(); 3042 // }; 3043 // 3044 // The return type will be changed later anyway. 3045 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3046 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3047 << SourceRange(D.getIdentifierLoc()); 3048 D.setInvalidType(); 3049 } 3050 3051 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3052 3053 // Make sure we don't have any parameters. 3054 if (Proto->getNumArgs() > 0) { 3055 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3056 3057 // Delete the parameters. 3058 D.getTypeObject(0).Fun.freeArgs(); 3059 D.setInvalidType(); 3060 } else if (Proto->isVariadic()) { 3061 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3062 D.setInvalidType(); 3063 } 3064 3065 // Diagnose "&operator bool()" and other such nonsense. This 3066 // is actually a gcc extension which we don't support. 3067 if (Proto->getResultType() != ConvType) { 3068 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3069 << Proto->getResultType(); 3070 D.setInvalidType(); 3071 ConvType = Proto->getResultType(); 3072 } 3073 3074 // C++ [class.conv.fct]p4: 3075 // The conversion-type-id shall not represent a function type nor 3076 // an array type. 3077 if (ConvType->isArrayType()) { 3078 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3079 ConvType = Context.getPointerType(ConvType); 3080 D.setInvalidType(); 3081 } else if (ConvType->isFunctionType()) { 3082 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3083 ConvType = Context.getPointerType(ConvType); 3084 D.setInvalidType(); 3085 } 3086 3087 // Rebuild the function type "R" without any parameters (in case any 3088 // of the errors above fired) and with the conversion type as the 3089 // return type. 3090 if (D.isInvalidType()) { 3091 R = Context.getFunctionType(ConvType, 0, 0, false, 3092 Proto->getTypeQuals(), 3093 Proto->hasExceptionSpec(), 3094 Proto->hasAnyExceptionSpec(), 3095 Proto->getNumExceptions(), 3096 Proto->exception_begin(), 3097 Proto->getExtInfo()); 3098 } 3099 3100 // C++0x explicit conversion operators. 3101 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3102 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3103 diag::warn_explicit_conversion_functions) 3104 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3105} 3106 3107/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3108/// the declaration of the given C++ conversion function. This routine 3109/// is responsible for recording the conversion function in the C++ 3110/// class, if possible. 3111Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3112 assert(Conversion && "Expected to receive a conversion function declaration"); 3113 3114 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3115 3116 // Make sure we aren't redeclaring the conversion function. 3117 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3118 3119 // C++ [class.conv.fct]p1: 3120 // [...] A conversion function is never used to convert a 3121 // (possibly cv-qualified) object to the (possibly cv-qualified) 3122 // same object type (or a reference to it), to a (possibly 3123 // cv-qualified) base class of that type (or a reference to it), 3124 // or to (possibly cv-qualified) void. 3125 // FIXME: Suppress this warning if the conversion function ends up being a 3126 // virtual function that overrides a virtual function in a base class. 3127 QualType ClassType 3128 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3129 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3130 ConvType = ConvTypeRef->getPointeeType(); 3131 if (ConvType->isRecordType()) { 3132 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3133 if (ConvType == ClassType) 3134 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3135 << ClassType; 3136 else if (IsDerivedFrom(ClassType, ConvType)) 3137 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3138 << ClassType << ConvType; 3139 } else if (ConvType->isVoidType()) { 3140 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3141 << ClassType << ConvType; 3142 } 3143 3144 if (Conversion->getPrimaryTemplate()) { 3145 // ignore specializations 3146 } else if (Conversion->getPreviousDeclaration()) { 3147 if (FunctionTemplateDecl *ConversionTemplate 3148 = Conversion->getDescribedFunctionTemplate()) { 3149 if (ClassDecl->replaceConversion( 3150 ConversionTemplate->getPreviousDeclaration(), 3151 ConversionTemplate)) 3152 return DeclPtrTy::make(ConversionTemplate); 3153 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3154 Conversion)) 3155 return DeclPtrTy::make(Conversion); 3156 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3157 } else if (FunctionTemplateDecl *ConversionTemplate 3158 = Conversion->getDescribedFunctionTemplate()) 3159 ClassDecl->addConversionFunction(ConversionTemplate); 3160 else 3161 ClassDecl->addConversionFunction(Conversion); 3162 3163 return DeclPtrTy::make(Conversion); 3164} 3165 3166//===----------------------------------------------------------------------===// 3167// Namespace Handling 3168//===----------------------------------------------------------------------===// 3169 3170/// ActOnStartNamespaceDef - This is called at the start of a namespace 3171/// definition. 3172Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3173 SourceLocation IdentLoc, 3174 IdentifierInfo *II, 3175 SourceLocation LBrace, 3176 AttributeList *AttrList) { 3177 NamespaceDecl *Namespc = 3178 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3179 Namespc->setLBracLoc(LBrace); 3180 3181 Scope *DeclRegionScope = NamespcScope->getParent(); 3182 3183 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3184 3185 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3186 PushPragmaVisibility(attr->getVisibility()); 3187 3188 if (II) { 3189 // C++ [namespace.def]p2: 3190 // The identifier in an original-namespace-definition shall not have been 3191 // previously defined in the declarative region in which the 3192 // original-namespace-definition appears. The identifier in an 3193 // original-namespace-definition is the name of the namespace. Subsequently 3194 // in that declarative region, it is treated as an original-namespace-name. 3195 3196 NamedDecl *PrevDecl 3197 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3198 ForRedeclaration); 3199 3200 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3201 // This is an extended namespace definition. 3202 // Attach this namespace decl to the chain of extended namespace 3203 // definitions. 3204 OrigNS->setNextNamespace(Namespc); 3205 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3206 3207 // Remove the previous declaration from the scope. 3208 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3209 IdResolver.RemoveDecl(OrigNS); 3210 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3211 } 3212 } else if (PrevDecl) { 3213 // This is an invalid name redefinition. 3214 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3215 << Namespc->getDeclName(); 3216 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3217 Namespc->setInvalidDecl(); 3218 // Continue on to push Namespc as current DeclContext and return it. 3219 } else if (II->isStr("std") && 3220 CurContext->getLookupContext()->isTranslationUnit()) { 3221 // This is the first "real" definition of the namespace "std", so update 3222 // our cache of the "std" namespace to point at this definition. 3223 if (NamespaceDecl *StdNS = getStdNamespace()) { 3224 // We had already defined a dummy namespace "std". Link this new 3225 // namespace definition to the dummy namespace "std". 3226 StdNS->setNextNamespace(Namespc); 3227 StdNS->setLocation(IdentLoc); 3228 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3229 } 3230 3231 // Make our StdNamespace cache point at the first real definition of the 3232 // "std" namespace. 3233 StdNamespace = Namespc; 3234 } 3235 3236 PushOnScopeChains(Namespc, DeclRegionScope); 3237 } else { 3238 // Anonymous namespaces. 3239 assert(Namespc->isAnonymousNamespace()); 3240 3241 // Link the anonymous namespace into its parent. 3242 NamespaceDecl *PrevDecl; 3243 DeclContext *Parent = CurContext->getLookupContext(); 3244 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3245 PrevDecl = TU->getAnonymousNamespace(); 3246 TU->setAnonymousNamespace(Namespc); 3247 } else { 3248 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3249 PrevDecl = ND->getAnonymousNamespace(); 3250 ND->setAnonymousNamespace(Namespc); 3251 } 3252 3253 // Link the anonymous namespace with its previous declaration. 3254 if (PrevDecl) { 3255 assert(PrevDecl->isAnonymousNamespace()); 3256 assert(!PrevDecl->getNextNamespace()); 3257 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3258 PrevDecl->setNextNamespace(Namespc); 3259 } 3260 3261 CurContext->addDecl(Namespc); 3262 3263 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3264 // behaves as if it were replaced by 3265 // namespace unique { /* empty body */ } 3266 // using namespace unique; 3267 // namespace unique { namespace-body } 3268 // where all occurrences of 'unique' in a translation unit are 3269 // replaced by the same identifier and this identifier differs 3270 // from all other identifiers in the entire program. 3271 3272 // We just create the namespace with an empty name and then add an 3273 // implicit using declaration, just like the standard suggests. 3274 // 3275 // CodeGen enforces the "universally unique" aspect by giving all 3276 // declarations semantically contained within an anonymous 3277 // namespace internal linkage. 3278 3279 if (!PrevDecl) { 3280 UsingDirectiveDecl* UD 3281 = UsingDirectiveDecl::Create(Context, CurContext, 3282 /* 'using' */ LBrace, 3283 /* 'namespace' */ SourceLocation(), 3284 /* qualifier */ SourceRange(), 3285 /* NNS */ NULL, 3286 /* identifier */ SourceLocation(), 3287 Namespc, 3288 /* Ancestor */ CurContext); 3289 UD->setImplicit(); 3290 CurContext->addDecl(UD); 3291 } 3292 } 3293 3294 // Although we could have an invalid decl (i.e. the namespace name is a 3295 // redefinition), push it as current DeclContext and try to continue parsing. 3296 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3297 // for the namespace has the declarations that showed up in that particular 3298 // namespace definition. 3299 PushDeclContext(NamespcScope, Namespc); 3300 return DeclPtrTy::make(Namespc); 3301} 3302 3303/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3304/// is a namespace alias, returns the namespace it points to. 3305static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3306 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3307 return AD->getNamespace(); 3308 return dyn_cast_or_null<NamespaceDecl>(D); 3309} 3310 3311/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3312/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3313void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3314 Decl *Dcl = D.getAs<Decl>(); 3315 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3316 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3317 Namespc->setRBracLoc(RBrace); 3318 PopDeclContext(); 3319 if (Namespc->hasAttr<VisibilityAttr>()) 3320 PopPragmaVisibility(); 3321} 3322 3323/// \brief Retrieve the special "std" namespace, which may require us to 3324/// implicitly define the namespace. 3325NamespaceDecl *Sema::getOrCreateStdNamespace() { 3326 if (!StdNamespace) { 3327 // The "std" namespace has not yet been defined, so build one implicitly. 3328 StdNamespace = NamespaceDecl::Create(Context, 3329 Context.getTranslationUnitDecl(), 3330 SourceLocation(), 3331 &PP.getIdentifierTable().get("std")); 3332 getStdNamespace()->setImplicit(true); 3333 } 3334 3335 return getStdNamespace(); 3336} 3337 3338Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3339 SourceLocation UsingLoc, 3340 SourceLocation NamespcLoc, 3341 CXXScopeSpec &SS, 3342 SourceLocation IdentLoc, 3343 IdentifierInfo *NamespcName, 3344 AttributeList *AttrList) { 3345 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3346 assert(NamespcName && "Invalid NamespcName."); 3347 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3348 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3349 3350 UsingDirectiveDecl *UDir = 0; 3351 NestedNameSpecifier *Qualifier = 0; 3352 if (SS.isSet()) 3353 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3354 3355 // Lookup namespace name. 3356 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3357 LookupParsedName(R, S, &SS); 3358 if (R.isAmbiguous()) 3359 return DeclPtrTy(); 3360 3361 if (R.empty()) { 3362 // Allow "using namespace std;" or "using namespace ::std;" even if 3363 // "std" hasn't been defined yet, for GCC compatibility. 3364 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3365 NamespcName->isStr("std")) { 3366 Diag(IdentLoc, diag::ext_using_undefined_std); 3367 R.addDecl(getOrCreateStdNamespace()); 3368 R.resolveKind(); 3369 } 3370 // Otherwise, attempt typo correction. 3371 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3372 CTC_NoKeywords, 0)) { 3373 if (R.getAsSingle<NamespaceDecl>() || 3374 R.getAsSingle<NamespaceAliasDecl>()) { 3375 if (DeclContext *DC = computeDeclContext(SS, false)) 3376 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3377 << NamespcName << DC << Corrected << SS.getRange() 3378 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3379 else 3380 Diag(IdentLoc, diag::err_using_directive_suggest) 3381 << NamespcName << Corrected 3382 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3383 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3384 << Corrected; 3385 3386 NamespcName = Corrected.getAsIdentifierInfo(); 3387 } else { 3388 R.clear(); 3389 R.setLookupName(NamespcName); 3390 } 3391 } 3392 } 3393 3394 if (!R.empty()) { 3395 NamedDecl *Named = R.getFoundDecl(); 3396 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3397 && "expected namespace decl"); 3398 // C++ [namespace.udir]p1: 3399 // A using-directive specifies that the names in the nominated 3400 // namespace can be used in the scope in which the 3401 // using-directive appears after the using-directive. During 3402 // unqualified name lookup (3.4.1), the names appear as if they 3403 // were declared in the nearest enclosing namespace which 3404 // contains both the using-directive and the nominated 3405 // namespace. [Note: in this context, "contains" means "contains 3406 // directly or indirectly". ] 3407 3408 // Find enclosing context containing both using-directive and 3409 // nominated namespace. 3410 NamespaceDecl *NS = getNamespaceDecl(Named); 3411 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3412 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3413 CommonAncestor = CommonAncestor->getParent(); 3414 3415 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3416 SS.getRange(), 3417 (NestedNameSpecifier *)SS.getScopeRep(), 3418 IdentLoc, Named, CommonAncestor); 3419 PushUsingDirective(S, UDir); 3420 } else { 3421 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3422 } 3423 3424 // FIXME: We ignore attributes for now. 3425 delete AttrList; 3426 return DeclPtrTy::make(UDir); 3427} 3428 3429void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3430 // If scope has associated entity, then using directive is at namespace 3431 // or translation unit scope. We add UsingDirectiveDecls, into 3432 // it's lookup structure. 3433 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3434 Ctx->addDecl(UDir); 3435 else 3436 // Otherwise it is block-sope. using-directives will affect lookup 3437 // only to the end of scope. 3438 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3439} 3440 3441 3442Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3443 AccessSpecifier AS, 3444 bool HasUsingKeyword, 3445 SourceLocation UsingLoc, 3446 CXXScopeSpec &SS, 3447 UnqualifiedId &Name, 3448 AttributeList *AttrList, 3449 bool IsTypeName, 3450 SourceLocation TypenameLoc) { 3451 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3452 3453 switch (Name.getKind()) { 3454 case UnqualifiedId::IK_Identifier: 3455 case UnqualifiedId::IK_OperatorFunctionId: 3456 case UnqualifiedId::IK_LiteralOperatorId: 3457 case UnqualifiedId::IK_ConversionFunctionId: 3458 break; 3459 3460 case UnqualifiedId::IK_ConstructorName: 3461 case UnqualifiedId::IK_ConstructorTemplateId: 3462 // C++0x inherited constructors. 3463 if (getLangOptions().CPlusPlus0x) break; 3464 3465 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3466 << SS.getRange(); 3467 return DeclPtrTy(); 3468 3469 case UnqualifiedId::IK_DestructorName: 3470 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3471 << SS.getRange(); 3472 return DeclPtrTy(); 3473 3474 case UnqualifiedId::IK_TemplateId: 3475 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3476 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3477 return DeclPtrTy(); 3478 } 3479 3480 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3481 DeclarationName TargetName = TargetNameInfo.getName(); 3482 if (!TargetName) 3483 return DeclPtrTy(); 3484 3485 // Warn about using declarations. 3486 // TODO: store that the declaration was written without 'using' and 3487 // talk about access decls instead of using decls in the 3488 // diagnostics. 3489 if (!HasUsingKeyword) { 3490 UsingLoc = Name.getSourceRange().getBegin(); 3491 3492 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3493 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3494 } 3495 3496 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3497 TargetNameInfo, AttrList, 3498 /* IsInstantiation */ false, 3499 IsTypeName, TypenameLoc); 3500 if (UD) 3501 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3502 3503 return DeclPtrTy::make(UD); 3504} 3505 3506/// \brief Determine whether a using declaration considers the given 3507/// declarations as "equivalent", e.g., if they are redeclarations of 3508/// the same entity or are both typedefs of the same type. 3509static bool 3510IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3511 bool &SuppressRedeclaration) { 3512 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3513 SuppressRedeclaration = false; 3514 return true; 3515 } 3516 3517 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3518 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3519 SuppressRedeclaration = true; 3520 return Context.hasSameType(TD1->getUnderlyingType(), 3521 TD2->getUnderlyingType()); 3522 } 3523 3524 return false; 3525} 3526 3527 3528/// Determines whether to create a using shadow decl for a particular 3529/// decl, given the set of decls existing prior to this using lookup. 3530bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3531 const LookupResult &Previous) { 3532 // Diagnose finding a decl which is not from a base class of the 3533 // current class. We do this now because there are cases where this 3534 // function will silently decide not to build a shadow decl, which 3535 // will pre-empt further diagnostics. 3536 // 3537 // We don't need to do this in C++0x because we do the check once on 3538 // the qualifier. 3539 // 3540 // FIXME: diagnose the following if we care enough: 3541 // struct A { int foo; }; 3542 // struct B : A { using A::foo; }; 3543 // template <class T> struct C : A {}; 3544 // template <class T> struct D : C<T> { using B::foo; } // <--- 3545 // This is invalid (during instantiation) in C++03 because B::foo 3546 // resolves to the using decl in B, which is not a base class of D<T>. 3547 // We can't diagnose it immediately because C<T> is an unknown 3548 // specialization. The UsingShadowDecl in D<T> then points directly 3549 // to A::foo, which will look well-formed when we instantiate. 3550 // The right solution is to not collapse the shadow-decl chain. 3551 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3552 DeclContext *OrigDC = Orig->getDeclContext(); 3553 3554 // Handle enums and anonymous structs. 3555 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3556 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3557 while (OrigRec->isAnonymousStructOrUnion()) 3558 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3559 3560 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3561 if (OrigDC == CurContext) { 3562 Diag(Using->getLocation(), 3563 diag::err_using_decl_nested_name_specifier_is_current_class) 3564 << Using->getNestedNameRange(); 3565 Diag(Orig->getLocation(), diag::note_using_decl_target); 3566 return true; 3567 } 3568 3569 Diag(Using->getNestedNameRange().getBegin(), 3570 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3571 << Using->getTargetNestedNameDecl() 3572 << cast<CXXRecordDecl>(CurContext) 3573 << Using->getNestedNameRange(); 3574 Diag(Orig->getLocation(), diag::note_using_decl_target); 3575 return true; 3576 } 3577 } 3578 3579 if (Previous.empty()) return false; 3580 3581 NamedDecl *Target = Orig; 3582 if (isa<UsingShadowDecl>(Target)) 3583 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3584 3585 // If the target happens to be one of the previous declarations, we 3586 // don't have a conflict. 3587 // 3588 // FIXME: but we might be increasing its access, in which case we 3589 // should redeclare it. 3590 NamedDecl *NonTag = 0, *Tag = 0; 3591 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3592 I != E; ++I) { 3593 NamedDecl *D = (*I)->getUnderlyingDecl(); 3594 bool Result; 3595 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3596 return Result; 3597 3598 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3599 } 3600 3601 if (Target->isFunctionOrFunctionTemplate()) { 3602 FunctionDecl *FD; 3603 if (isa<FunctionTemplateDecl>(Target)) 3604 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3605 else 3606 FD = cast<FunctionDecl>(Target); 3607 3608 NamedDecl *OldDecl = 0; 3609 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3610 case Ovl_Overload: 3611 return false; 3612 3613 case Ovl_NonFunction: 3614 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3615 break; 3616 3617 // We found a decl with the exact signature. 3618 case Ovl_Match: 3619 // If we're in a record, we want to hide the target, so we 3620 // return true (without a diagnostic) to tell the caller not to 3621 // build a shadow decl. 3622 if (CurContext->isRecord()) 3623 return true; 3624 3625 // If we're not in a record, this is an error. 3626 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3627 break; 3628 } 3629 3630 Diag(Target->getLocation(), diag::note_using_decl_target); 3631 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3632 return true; 3633 } 3634 3635 // Target is not a function. 3636 3637 if (isa<TagDecl>(Target)) { 3638 // No conflict between a tag and a non-tag. 3639 if (!Tag) return false; 3640 3641 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3642 Diag(Target->getLocation(), diag::note_using_decl_target); 3643 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3644 return true; 3645 } 3646 3647 // No conflict between a tag and a non-tag. 3648 if (!NonTag) return false; 3649 3650 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3651 Diag(Target->getLocation(), diag::note_using_decl_target); 3652 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3653 return true; 3654} 3655 3656/// Builds a shadow declaration corresponding to a 'using' declaration. 3657UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3658 UsingDecl *UD, 3659 NamedDecl *Orig) { 3660 3661 // If we resolved to another shadow declaration, just coalesce them. 3662 NamedDecl *Target = Orig; 3663 if (isa<UsingShadowDecl>(Target)) { 3664 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3665 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3666 } 3667 3668 UsingShadowDecl *Shadow 3669 = UsingShadowDecl::Create(Context, CurContext, 3670 UD->getLocation(), UD, Target); 3671 UD->addShadowDecl(Shadow); 3672 3673 if (S) 3674 PushOnScopeChains(Shadow, S); 3675 else 3676 CurContext->addDecl(Shadow); 3677 Shadow->setAccess(UD->getAccess()); 3678 3679 // Register it as a conversion if appropriate. 3680 if (Shadow->getDeclName().getNameKind() 3681 == DeclarationName::CXXConversionFunctionName) 3682 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3683 3684 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3685 Shadow->setInvalidDecl(); 3686 3687 return Shadow; 3688} 3689 3690/// Hides a using shadow declaration. This is required by the current 3691/// using-decl implementation when a resolvable using declaration in a 3692/// class is followed by a declaration which would hide or override 3693/// one or more of the using decl's targets; for example: 3694/// 3695/// struct Base { void foo(int); }; 3696/// struct Derived : Base { 3697/// using Base::foo; 3698/// void foo(int); 3699/// }; 3700/// 3701/// The governing language is C++03 [namespace.udecl]p12: 3702/// 3703/// When a using-declaration brings names from a base class into a 3704/// derived class scope, member functions in the derived class 3705/// override and/or hide member functions with the same name and 3706/// parameter types in a base class (rather than conflicting). 3707/// 3708/// There are two ways to implement this: 3709/// (1) optimistically create shadow decls when they're not hidden 3710/// by existing declarations, or 3711/// (2) don't create any shadow decls (or at least don't make them 3712/// visible) until we've fully parsed/instantiated the class. 3713/// The problem with (1) is that we might have to retroactively remove 3714/// a shadow decl, which requires several O(n) operations because the 3715/// decl structures are (very reasonably) not designed for removal. 3716/// (2) avoids this but is very fiddly and phase-dependent. 3717void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3718 if (Shadow->getDeclName().getNameKind() == 3719 DeclarationName::CXXConversionFunctionName) 3720 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3721 3722 // Remove it from the DeclContext... 3723 Shadow->getDeclContext()->removeDecl(Shadow); 3724 3725 // ...and the scope, if applicable... 3726 if (S) { 3727 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3728 IdResolver.RemoveDecl(Shadow); 3729 } 3730 3731 // ...and the using decl. 3732 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3733 3734 // TODO: complain somehow if Shadow was used. It shouldn't 3735 // be possible for this to happen, because...? 3736} 3737 3738/// Builds a using declaration. 3739/// 3740/// \param IsInstantiation - Whether this call arises from an 3741/// instantiation of an unresolved using declaration. We treat 3742/// the lookup differently for these declarations. 3743NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3744 SourceLocation UsingLoc, 3745 CXXScopeSpec &SS, 3746 const DeclarationNameInfo &NameInfo, 3747 AttributeList *AttrList, 3748 bool IsInstantiation, 3749 bool IsTypeName, 3750 SourceLocation TypenameLoc) { 3751 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3752 SourceLocation IdentLoc = NameInfo.getLoc(); 3753 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3754 3755 // FIXME: We ignore attributes for now. 3756 delete AttrList; 3757 3758 if (SS.isEmpty()) { 3759 Diag(IdentLoc, diag::err_using_requires_qualname); 3760 return 0; 3761 } 3762 3763 // Do the redeclaration lookup in the current scope. 3764 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3765 ForRedeclaration); 3766 Previous.setHideTags(false); 3767 if (S) { 3768 LookupName(Previous, S); 3769 3770 // It is really dumb that we have to do this. 3771 LookupResult::Filter F = Previous.makeFilter(); 3772 while (F.hasNext()) { 3773 NamedDecl *D = F.next(); 3774 if (!isDeclInScope(D, CurContext, S)) 3775 F.erase(); 3776 } 3777 F.done(); 3778 } else { 3779 assert(IsInstantiation && "no scope in non-instantiation"); 3780 assert(CurContext->isRecord() && "scope not record in instantiation"); 3781 LookupQualifiedName(Previous, CurContext); 3782 } 3783 3784 NestedNameSpecifier *NNS = 3785 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3786 3787 // Check for invalid redeclarations. 3788 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3789 return 0; 3790 3791 // Check for bad qualifiers. 3792 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3793 return 0; 3794 3795 DeclContext *LookupContext = computeDeclContext(SS); 3796 NamedDecl *D; 3797 if (!LookupContext) { 3798 if (IsTypeName) { 3799 // FIXME: not all declaration name kinds are legal here 3800 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3801 UsingLoc, TypenameLoc, 3802 SS.getRange(), NNS, 3803 IdentLoc, NameInfo.getName()); 3804 } else { 3805 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3806 UsingLoc, SS.getRange(), 3807 NNS, NameInfo); 3808 } 3809 } else { 3810 D = UsingDecl::Create(Context, CurContext, 3811 SS.getRange(), UsingLoc, NNS, NameInfo, 3812 IsTypeName); 3813 } 3814 D->setAccess(AS); 3815 CurContext->addDecl(D); 3816 3817 if (!LookupContext) return D; 3818 UsingDecl *UD = cast<UsingDecl>(D); 3819 3820 if (RequireCompleteDeclContext(SS, LookupContext)) { 3821 UD->setInvalidDecl(); 3822 return UD; 3823 } 3824 3825 // Look up the target name. 3826 3827 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3828 3829 // Unlike most lookups, we don't always want to hide tag 3830 // declarations: tag names are visible through the using declaration 3831 // even if hidden by ordinary names, *except* in a dependent context 3832 // where it's important for the sanity of two-phase lookup. 3833 if (!IsInstantiation) 3834 R.setHideTags(false); 3835 3836 LookupQualifiedName(R, LookupContext); 3837 3838 if (R.empty()) { 3839 Diag(IdentLoc, diag::err_no_member) 3840 << NameInfo.getName() << LookupContext << SS.getRange(); 3841 UD->setInvalidDecl(); 3842 return UD; 3843 } 3844 3845 if (R.isAmbiguous()) { 3846 UD->setInvalidDecl(); 3847 return UD; 3848 } 3849 3850 if (IsTypeName) { 3851 // If we asked for a typename and got a non-type decl, error out. 3852 if (!R.getAsSingle<TypeDecl>()) { 3853 Diag(IdentLoc, diag::err_using_typename_non_type); 3854 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3855 Diag((*I)->getUnderlyingDecl()->getLocation(), 3856 diag::note_using_decl_target); 3857 UD->setInvalidDecl(); 3858 return UD; 3859 } 3860 } else { 3861 // If we asked for a non-typename and we got a type, error out, 3862 // but only if this is an instantiation of an unresolved using 3863 // decl. Otherwise just silently find the type name. 3864 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3865 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3866 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3867 UD->setInvalidDecl(); 3868 return UD; 3869 } 3870 } 3871 3872 // C++0x N2914 [namespace.udecl]p6: 3873 // A using-declaration shall not name a namespace. 3874 if (R.getAsSingle<NamespaceDecl>()) { 3875 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3876 << SS.getRange(); 3877 UD->setInvalidDecl(); 3878 return UD; 3879 } 3880 3881 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3882 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3883 BuildUsingShadowDecl(S, UD, *I); 3884 } 3885 3886 return UD; 3887} 3888 3889/// Checks that the given using declaration is not an invalid 3890/// redeclaration. Note that this is checking only for the using decl 3891/// itself, not for any ill-formedness among the UsingShadowDecls. 3892bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3893 bool isTypeName, 3894 const CXXScopeSpec &SS, 3895 SourceLocation NameLoc, 3896 const LookupResult &Prev) { 3897 // C++03 [namespace.udecl]p8: 3898 // C++0x [namespace.udecl]p10: 3899 // A using-declaration is a declaration and can therefore be used 3900 // repeatedly where (and only where) multiple declarations are 3901 // allowed. 3902 // 3903 // That's in non-member contexts. 3904 if (!CurContext->getLookupContext()->isRecord()) 3905 return false; 3906 3907 NestedNameSpecifier *Qual 3908 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3909 3910 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3911 NamedDecl *D = *I; 3912 3913 bool DTypename; 3914 NestedNameSpecifier *DQual; 3915 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3916 DTypename = UD->isTypeName(); 3917 DQual = UD->getTargetNestedNameDecl(); 3918 } else if (UnresolvedUsingValueDecl *UD 3919 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3920 DTypename = false; 3921 DQual = UD->getTargetNestedNameSpecifier(); 3922 } else if (UnresolvedUsingTypenameDecl *UD 3923 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3924 DTypename = true; 3925 DQual = UD->getTargetNestedNameSpecifier(); 3926 } else continue; 3927 3928 // using decls differ if one says 'typename' and the other doesn't. 3929 // FIXME: non-dependent using decls? 3930 if (isTypeName != DTypename) continue; 3931 3932 // using decls differ if they name different scopes (but note that 3933 // template instantiation can cause this check to trigger when it 3934 // didn't before instantiation). 3935 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3936 Context.getCanonicalNestedNameSpecifier(DQual)) 3937 continue; 3938 3939 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3940 Diag(D->getLocation(), diag::note_using_decl) << 1; 3941 return true; 3942 } 3943 3944 return false; 3945} 3946 3947 3948/// Checks that the given nested-name qualifier used in a using decl 3949/// in the current context is appropriately related to the current 3950/// scope. If an error is found, diagnoses it and returns true. 3951bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3952 const CXXScopeSpec &SS, 3953 SourceLocation NameLoc) { 3954 DeclContext *NamedContext = computeDeclContext(SS); 3955 3956 if (!CurContext->isRecord()) { 3957 // C++03 [namespace.udecl]p3: 3958 // C++0x [namespace.udecl]p8: 3959 // A using-declaration for a class member shall be a member-declaration. 3960 3961 // If we weren't able to compute a valid scope, it must be a 3962 // dependent class scope. 3963 if (!NamedContext || NamedContext->isRecord()) { 3964 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3965 << SS.getRange(); 3966 return true; 3967 } 3968 3969 // Otherwise, everything is known to be fine. 3970 return false; 3971 } 3972 3973 // The current scope is a record. 3974 3975 // If the named context is dependent, we can't decide much. 3976 if (!NamedContext) { 3977 // FIXME: in C++0x, we can diagnose if we can prove that the 3978 // nested-name-specifier does not refer to a base class, which is 3979 // still possible in some cases. 3980 3981 // Otherwise we have to conservatively report that things might be 3982 // okay. 3983 return false; 3984 } 3985 3986 if (!NamedContext->isRecord()) { 3987 // Ideally this would point at the last name in the specifier, 3988 // but we don't have that level of source info. 3989 Diag(SS.getRange().getBegin(), 3990 diag::err_using_decl_nested_name_specifier_is_not_class) 3991 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3992 return true; 3993 } 3994 3995 if (getLangOptions().CPlusPlus0x) { 3996 // C++0x [namespace.udecl]p3: 3997 // In a using-declaration used as a member-declaration, the 3998 // nested-name-specifier shall name a base class of the class 3999 // being defined. 4000 4001 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4002 cast<CXXRecordDecl>(NamedContext))) { 4003 if (CurContext == NamedContext) { 4004 Diag(NameLoc, 4005 diag::err_using_decl_nested_name_specifier_is_current_class) 4006 << SS.getRange(); 4007 return true; 4008 } 4009 4010 Diag(SS.getRange().getBegin(), 4011 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4012 << (NestedNameSpecifier*) SS.getScopeRep() 4013 << cast<CXXRecordDecl>(CurContext) 4014 << SS.getRange(); 4015 return true; 4016 } 4017 4018 return false; 4019 } 4020 4021 // C++03 [namespace.udecl]p4: 4022 // A using-declaration used as a member-declaration shall refer 4023 // to a member of a base class of the class being defined [etc.]. 4024 4025 // Salient point: SS doesn't have to name a base class as long as 4026 // lookup only finds members from base classes. Therefore we can 4027 // diagnose here only if we can prove that that can't happen, 4028 // i.e. if the class hierarchies provably don't intersect. 4029 4030 // TODO: it would be nice if "definitely valid" results were cached 4031 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4032 // need to be repeated. 4033 4034 struct UserData { 4035 llvm::DenseSet<const CXXRecordDecl*> Bases; 4036 4037 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4038 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4039 Data->Bases.insert(Base); 4040 return true; 4041 } 4042 4043 bool hasDependentBases(const CXXRecordDecl *Class) { 4044 return !Class->forallBases(collect, this); 4045 } 4046 4047 /// Returns true if the base is dependent or is one of the 4048 /// accumulated base classes. 4049 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4050 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4051 return !Data->Bases.count(Base); 4052 } 4053 4054 bool mightShareBases(const CXXRecordDecl *Class) { 4055 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4056 } 4057 }; 4058 4059 UserData Data; 4060 4061 // Returns false if we find a dependent base. 4062 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4063 return false; 4064 4065 // Returns false if the class has a dependent base or if it or one 4066 // of its bases is present in the base set of the current context. 4067 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4068 return false; 4069 4070 Diag(SS.getRange().getBegin(), 4071 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4072 << (NestedNameSpecifier*) SS.getScopeRep() 4073 << cast<CXXRecordDecl>(CurContext) 4074 << SS.getRange(); 4075 4076 return true; 4077} 4078 4079Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4080 SourceLocation NamespaceLoc, 4081 SourceLocation AliasLoc, 4082 IdentifierInfo *Alias, 4083 CXXScopeSpec &SS, 4084 SourceLocation IdentLoc, 4085 IdentifierInfo *Ident) { 4086 4087 // Lookup the namespace name. 4088 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4089 LookupParsedName(R, S, &SS); 4090 4091 // Check if we have a previous declaration with the same name. 4092 NamedDecl *PrevDecl 4093 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4094 ForRedeclaration); 4095 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4096 PrevDecl = 0; 4097 4098 if (PrevDecl) { 4099 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4100 // We already have an alias with the same name that points to the same 4101 // namespace, so don't create a new one. 4102 // FIXME: At some point, we'll want to create the (redundant) 4103 // declaration to maintain better source information. 4104 if (!R.isAmbiguous() && !R.empty() && 4105 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4106 return DeclPtrTy(); 4107 } 4108 4109 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4110 diag::err_redefinition_different_kind; 4111 Diag(AliasLoc, DiagID) << Alias; 4112 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4113 return DeclPtrTy(); 4114 } 4115 4116 if (R.isAmbiguous()) 4117 return DeclPtrTy(); 4118 4119 if (R.empty()) { 4120 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4121 CTC_NoKeywords, 0)) { 4122 if (R.getAsSingle<NamespaceDecl>() || 4123 R.getAsSingle<NamespaceAliasDecl>()) { 4124 if (DeclContext *DC = computeDeclContext(SS, false)) 4125 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4126 << Ident << DC << Corrected << SS.getRange() 4127 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4128 else 4129 Diag(IdentLoc, diag::err_using_directive_suggest) 4130 << Ident << Corrected 4131 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4132 4133 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4134 << Corrected; 4135 4136 Ident = Corrected.getAsIdentifierInfo(); 4137 } else { 4138 R.clear(); 4139 R.setLookupName(Ident); 4140 } 4141 } 4142 4143 if (R.empty()) { 4144 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4145 return DeclPtrTy(); 4146 } 4147 } 4148 4149 NamespaceAliasDecl *AliasDecl = 4150 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4151 Alias, SS.getRange(), 4152 (NestedNameSpecifier *)SS.getScopeRep(), 4153 IdentLoc, R.getFoundDecl()); 4154 4155 PushOnScopeChains(AliasDecl, S); 4156 return DeclPtrTy::make(AliasDecl); 4157} 4158 4159namespace { 4160 /// \brief Scoped object used to handle the state changes required in Sema 4161 /// to implicitly define the body of a C++ member function; 4162 class ImplicitlyDefinedFunctionScope { 4163 Sema &S; 4164 DeclContext *PreviousContext; 4165 4166 public: 4167 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4168 : S(S), PreviousContext(S.CurContext) 4169 { 4170 S.CurContext = Method; 4171 S.PushFunctionScope(); 4172 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4173 } 4174 4175 ~ImplicitlyDefinedFunctionScope() { 4176 S.PopExpressionEvaluationContext(); 4177 S.PopFunctionOrBlockScope(); 4178 S.CurContext = PreviousContext; 4179 } 4180 }; 4181} 4182 4183CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4184 CXXRecordDecl *ClassDecl) { 4185 // C++ [class.ctor]p5: 4186 // A default constructor for a class X is a constructor of class X 4187 // that can be called without an argument. If there is no 4188 // user-declared constructor for class X, a default constructor is 4189 // implicitly declared. An implicitly-declared default constructor 4190 // is an inline public member of its class. 4191 assert(!ClassDecl->hasUserDeclaredConstructor() && 4192 "Should not build implicit default constructor!"); 4193 4194 // C++ [except.spec]p14: 4195 // An implicitly declared special member function (Clause 12) shall have an 4196 // exception-specification. [...] 4197 ImplicitExceptionSpecification ExceptSpec(Context); 4198 4199 // Direct base-class destructors. 4200 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4201 BEnd = ClassDecl->bases_end(); 4202 B != BEnd; ++B) { 4203 if (B->isVirtual()) // Handled below. 4204 continue; 4205 4206 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4207 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4208 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4209 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4210 else if (CXXConstructorDecl *Constructor 4211 = BaseClassDecl->getDefaultConstructor()) 4212 ExceptSpec.CalledDecl(Constructor); 4213 } 4214 } 4215 4216 // Virtual base-class destructors. 4217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4218 BEnd = ClassDecl->vbases_end(); 4219 B != BEnd; ++B) { 4220 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4221 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4222 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4223 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4224 else if (CXXConstructorDecl *Constructor 4225 = BaseClassDecl->getDefaultConstructor()) 4226 ExceptSpec.CalledDecl(Constructor); 4227 } 4228 } 4229 4230 // Field destructors. 4231 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4232 FEnd = ClassDecl->field_end(); 4233 F != FEnd; ++F) { 4234 if (const RecordType *RecordTy 4235 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4236 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4237 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4238 ExceptSpec.CalledDecl( 4239 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4240 else if (CXXConstructorDecl *Constructor 4241 = FieldClassDecl->getDefaultConstructor()) 4242 ExceptSpec.CalledDecl(Constructor); 4243 } 4244 } 4245 4246 4247 // Create the actual constructor declaration. 4248 CanQualType ClassType 4249 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4250 DeclarationName Name 4251 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4252 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4253 CXXConstructorDecl *DefaultCon 4254 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4255 Context.getFunctionType(Context.VoidTy, 4256 0, 0, false, 0, 4257 ExceptSpec.hasExceptionSpecification(), 4258 ExceptSpec.hasAnyExceptionSpecification(), 4259 ExceptSpec.size(), 4260 ExceptSpec.data(), 4261 FunctionType::ExtInfo()), 4262 /*TInfo=*/0, 4263 /*isExplicit=*/false, 4264 /*isInline=*/true, 4265 /*isImplicitlyDeclared=*/true); 4266 DefaultCon->setAccess(AS_public); 4267 DefaultCon->setImplicit(); 4268 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4269 4270 // Note that we have declared this constructor. 4271 ClassDecl->setDeclaredDefaultConstructor(true); 4272 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4273 4274 if (Scope *S = getScopeForContext(ClassDecl)) 4275 PushOnScopeChains(DefaultCon, S, false); 4276 ClassDecl->addDecl(DefaultCon); 4277 4278 return DefaultCon; 4279} 4280 4281void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4282 CXXConstructorDecl *Constructor) { 4283 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4284 !Constructor->isUsed(false)) && 4285 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4286 4287 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4288 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4289 4290 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4291 ErrorTrap Trap(*this); 4292 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4293 Trap.hasErrorOccurred()) { 4294 Diag(CurrentLocation, diag::note_member_synthesized_at) 4295 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4296 Constructor->setInvalidDecl(); 4297 } else { 4298 Constructor->setUsed(); 4299 MarkVTableUsed(CurrentLocation, ClassDecl); 4300 } 4301} 4302 4303CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4304 // C++ [class.dtor]p2: 4305 // If a class has no user-declared destructor, a destructor is 4306 // declared implicitly. An implicitly-declared destructor is an 4307 // inline public member of its class. 4308 4309 // C++ [except.spec]p14: 4310 // An implicitly declared special member function (Clause 12) shall have 4311 // an exception-specification. 4312 ImplicitExceptionSpecification ExceptSpec(Context); 4313 4314 // Direct base-class destructors. 4315 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4316 BEnd = ClassDecl->bases_end(); 4317 B != BEnd; ++B) { 4318 if (B->isVirtual()) // Handled below. 4319 continue; 4320 4321 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4322 ExceptSpec.CalledDecl( 4323 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4324 } 4325 4326 // Virtual base-class destructors. 4327 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4328 BEnd = ClassDecl->vbases_end(); 4329 B != BEnd; ++B) { 4330 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4331 ExceptSpec.CalledDecl( 4332 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4333 } 4334 4335 // Field destructors. 4336 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4337 FEnd = ClassDecl->field_end(); 4338 F != FEnd; ++F) { 4339 if (const RecordType *RecordTy 4340 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4341 ExceptSpec.CalledDecl( 4342 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4343 } 4344 4345 // Create the actual destructor declaration. 4346 QualType Ty = Context.getFunctionType(Context.VoidTy, 4347 0, 0, false, 0, 4348 ExceptSpec.hasExceptionSpecification(), 4349 ExceptSpec.hasAnyExceptionSpecification(), 4350 ExceptSpec.size(), 4351 ExceptSpec.data(), 4352 FunctionType::ExtInfo()); 4353 4354 CanQualType ClassType 4355 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4356 DeclarationName Name 4357 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4358 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4359 CXXDestructorDecl *Destructor 4360 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4361 /*isInline=*/true, 4362 /*isImplicitlyDeclared=*/true); 4363 Destructor->setAccess(AS_public); 4364 Destructor->setImplicit(); 4365 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4366 4367 // Note that we have declared this destructor. 4368 ClassDecl->setDeclaredDestructor(true); 4369 ++ASTContext::NumImplicitDestructorsDeclared; 4370 4371 // Introduce this destructor into its scope. 4372 if (Scope *S = getScopeForContext(ClassDecl)) 4373 PushOnScopeChains(Destructor, S, false); 4374 ClassDecl->addDecl(Destructor); 4375 4376 // This could be uniqued if it ever proves significant. 4377 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4378 4379 AddOverriddenMethods(ClassDecl, Destructor); 4380 4381 return Destructor; 4382} 4383 4384void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4385 CXXDestructorDecl *Destructor) { 4386 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4387 "DefineImplicitDestructor - call it for implicit default dtor"); 4388 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4389 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4390 4391 if (Destructor->isInvalidDecl()) 4392 return; 4393 4394 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4395 4396 ErrorTrap Trap(*this); 4397 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4398 Destructor->getParent()); 4399 4400 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4401 Diag(CurrentLocation, diag::note_member_synthesized_at) 4402 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4403 4404 Destructor->setInvalidDecl(); 4405 return; 4406 } 4407 4408 Destructor->setUsed(); 4409 MarkVTableUsed(CurrentLocation, ClassDecl); 4410} 4411 4412/// \brief Builds a statement that copies the given entity from \p From to 4413/// \c To. 4414/// 4415/// This routine is used to copy the members of a class with an 4416/// implicitly-declared copy assignment operator. When the entities being 4417/// copied are arrays, this routine builds for loops to copy them. 4418/// 4419/// \param S The Sema object used for type-checking. 4420/// 4421/// \param Loc The location where the implicit copy is being generated. 4422/// 4423/// \param T The type of the expressions being copied. Both expressions must 4424/// have this type. 4425/// 4426/// \param To The expression we are copying to. 4427/// 4428/// \param From The expression we are copying from. 4429/// 4430/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4431/// Otherwise, it's a non-static member subobject. 4432/// 4433/// \param Depth Internal parameter recording the depth of the recursion. 4434/// 4435/// \returns A statement or a loop that copies the expressions. 4436static Sema::OwningStmtResult 4437BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4438 Sema::OwningExprResult To, Sema::OwningExprResult From, 4439 bool CopyingBaseSubobject, unsigned Depth = 0) { 4440 typedef Sema::OwningStmtResult OwningStmtResult; 4441 typedef Sema::OwningExprResult OwningExprResult; 4442 4443 // C++0x [class.copy]p30: 4444 // Each subobject is assigned in the manner appropriate to its type: 4445 // 4446 // - if the subobject is of class type, the copy assignment operator 4447 // for the class is used (as if by explicit qualification; that is, 4448 // ignoring any possible virtual overriding functions in more derived 4449 // classes); 4450 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4451 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4452 4453 // Look for operator=. 4454 DeclarationName Name 4455 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4456 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4457 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4458 4459 // Filter out any result that isn't a copy-assignment operator. 4460 LookupResult::Filter F = OpLookup.makeFilter(); 4461 while (F.hasNext()) { 4462 NamedDecl *D = F.next(); 4463 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4464 if (Method->isCopyAssignmentOperator()) 4465 continue; 4466 4467 F.erase(); 4468 } 4469 F.done(); 4470 4471 // Suppress the protected check (C++ [class.protected]) for each of the 4472 // assignment operators we found. This strange dance is required when 4473 // we're assigning via a base classes's copy-assignment operator. To 4474 // ensure that we're getting the right base class subobject (without 4475 // ambiguities), we need to cast "this" to that subobject type; to 4476 // ensure that we don't go through the virtual call mechanism, we need 4477 // to qualify the operator= name with the base class (see below). However, 4478 // this means that if the base class has a protected copy assignment 4479 // operator, the protected member access check will fail. So, we 4480 // rewrite "protected" access to "public" access in this case, since we 4481 // know by construction that we're calling from a derived class. 4482 if (CopyingBaseSubobject) { 4483 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4484 L != LEnd; ++L) { 4485 if (L.getAccess() == AS_protected) 4486 L.setAccess(AS_public); 4487 } 4488 } 4489 4490 // Create the nested-name-specifier that will be used to qualify the 4491 // reference to operator=; this is required to suppress the virtual 4492 // call mechanism. 4493 CXXScopeSpec SS; 4494 SS.setRange(Loc); 4495 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4496 T.getTypePtr())); 4497 4498 // Create the reference to operator=. 4499 OwningExprResult OpEqualRef 4500 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4501 /*FirstQualifierInScope=*/0, OpLookup, 4502 /*TemplateArgs=*/0, 4503 /*SuppressQualifierCheck=*/true); 4504 if (OpEqualRef.isInvalid()) 4505 return S.StmtError(); 4506 4507 // Build the call to the assignment operator. 4508 Expr *FromE = From.takeAs<Expr>(); 4509 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4510 OpEqualRef.takeAs<Expr>(), 4511 Loc, &FromE, 1, 0, Loc); 4512 if (Call.isInvalid()) 4513 return S.StmtError(); 4514 4515 return S.Owned(Call.takeAs<Stmt>()); 4516 } 4517 4518 // - if the subobject is of scalar type, the built-in assignment 4519 // operator is used. 4520 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4521 if (!ArrayTy) { 4522 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4523 BinaryOperator::Assign, 4524 To.takeAs<Expr>(), 4525 From.takeAs<Expr>()); 4526 if (Assignment.isInvalid()) 4527 return S.StmtError(); 4528 4529 return S.Owned(Assignment.takeAs<Stmt>()); 4530 } 4531 4532 // - if the subobject is an array, each element is assigned, in the 4533 // manner appropriate to the element type; 4534 4535 // Construct a loop over the array bounds, e.g., 4536 // 4537 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4538 // 4539 // that will copy each of the array elements. 4540 QualType SizeType = S.Context.getSizeType(); 4541 4542 // Create the iteration variable. 4543 IdentifierInfo *IterationVarName = 0; 4544 { 4545 llvm::SmallString<8> Str; 4546 llvm::raw_svector_ostream OS(Str); 4547 OS << "__i" << Depth; 4548 IterationVarName = &S.Context.Idents.get(OS.str()); 4549 } 4550 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4551 IterationVarName, SizeType, 4552 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4553 VarDecl::None, VarDecl::None); 4554 4555 // Initialize the iteration variable to zero. 4556 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4557 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4558 4559 // Create a reference to the iteration variable; we'll use this several 4560 // times throughout. 4561 Expr *IterationVarRef 4562 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4563 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4564 4565 // Create the DeclStmt that holds the iteration variable. 4566 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4567 4568 // Create the comparison against the array bound. 4569 llvm::APInt Upper = ArrayTy->getSize(); 4570 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4571 OwningExprResult Comparison 4572 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4573 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4574 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4575 4576 // Create the pre-increment of the iteration variable. 4577 OwningExprResult Increment 4578 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4579 UnaryOperator::PreInc, 4580 SizeType, Loc)); 4581 4582 // Subscript the "from" and "to" expressions with the iteration variable. 4583 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4584 S.Owned(IterationVarRef->Retain()), 4585 Loc); 4586 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4587 S.Owned(IterationVarRef->Retain()), 4588 Loc); 4589 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4590 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4591 4592 // Build the copy for an individual element of the array. 4593 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4594 ArrayTy->getElementType(), 4595 move(To), move(From), 4596 CopyingBaseSubobject, Depth+1); 4597 if (Copy.isInvalid()) 4598 return S.StmtError(); 4599 4600 // Construct the loop that copies all elements of this array. 4601 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4602 S.MakeFullExpr(Comparison), 4603 Sema::DeclPtrTy(), 4604 S.MakeFullExpr(Increment), 4605 Loc, move(Copy)); 4606} 4607 4608/// \brief Determine whether the given class has a copy assignment operator 4609/// that accepts a const-qualified argument. 4610static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4611 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4612 4613 if (!Class->hasDeclaredCopyAssignment()) 4614 S.DeclareImplicitCopyAssignment(Class); 4615 4616 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4617 DeclarationName OpName 4618 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4619 4620 DeclContext::lookup_const_iterator Op, OpEnd; 4621 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4622 // C++ [class.copy]p9: 4623 // A user-declared copy assignment operator is a non-static non-template 4624 // member function of class X with exactly one parameter of type X, X&, 4625 // const X&, volatile X& or const volatile X&. 4626 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4627 if (!Method) 4628 continue; 4629 4630 if (Method->isStatic()) 4631 continue; 4632 if (Method->getPrimaryTemplate()) 4633 continue; 4634 const FunctionProtoType *FnType = 4635 Method->getType()->getAs<FunctionProtoType>(); 4636 assert(FnType && "Overloaded operator has no prototype."); 4637 // Don't assert on this; an invalid decl might have been left in the AST. 4638 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4639 continue; 4640 bool AcceptsConst = true; 4641 QualType ArgType = FnType->getArgType(0); 4642 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4643 ArgType = Ref->getPointeeType(); 4644 // Is it a non-const lvalue reference? 4645 if (!ArgType.isConstQualified()) 4646 AcceptsConst = false; 4647 } 4648 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4649 continue; 4650 4651 // We have a single argument of type cv X or cv X&, i.e. we've found the 4652 // copy assignment operator. Return whether it accepts const arguments. 4653 return AcceptsConst; 4654 } 4655 assert(Class->isInvalidDecl() && 4656 "No copy assignment operator declared in valid code."); 4657 return false; 4658} 4659 4660CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4661 // Note: The following rules are largely analoguous to the copy 4662 // constructor rules. Note that virtual bases are not taken into account 4663 // for determining the argument type of the operator. Note also that 4664 // operators taking an object instead of a reference are allowed. 4665 4666 4667 // C++ [class.copy]p10: 4668 // If the class definition does not explicitly declare a copy 4669 // assignment operator, one is declared implicitly. 4670 // The implicitly-defined copy assignment operator for a class X 4671 // will have the form 4672 // 4673 // X& X::operator=(const X&) 4674 // 4675 // if 4676 bool HasConstCopyAssignment = true; 4677 4678 // -- each direct base class B of X has a copy assignment operator 4679 // whose parameter is of type const B&, const volatile B& or B, 4680 // and 4681 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4682 BaseEnd = ClassDecl->bases_end(); 4683 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4684 assert(!Base->getType()->isDependentType() && 4685 "Cannot generate implicit members for class with dependent bases."); 4686 const CXXRecordDecl *BaseClassDecl 4687 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4688 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4689 } 4690 4691 // -- for all the nonstatic data members of X that are of a class 4692 // type M (or array thereof), each such class type has a copy 4693 // assignment operator whose parameter is of type const M&, 4694 // const volatile M& or M. 4695 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4696 FieldEnd = ClassDecl->field_end(); 4697 HasConstCopyAssignment && Field != FieldEnd; 4698 ++Field) { 4699 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4700 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4701 const CXXRecordDecl *FieldClassDecl 4702 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4703 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4704 } 4705 } 4706 4707 // Otherwise, the implicitly declared copy assignment operator will 4708 // have the form 4709 // 4710 // X& X::operator=(X&) 4711 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4712 QualType RetType = Context.getLValueReferenceType(ArgType); 4713 if (HasConstCopyAssignment) 4714 ArgType = ArgType.withConst(); 4715 ArgType = Context.getLValueReferenceType(ArgType); 4716 4717 // C++ [except.spec]p14: 4718 // An implicitly declared special member function (Clause 12) shall have an 4719 // exception-specification. [...] 4720 ImplicitExceptionSpecification ExceptSpec(Context); 4721 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4722 BaseEnd = ClassDecl->bases_end(); 4723 Base != BaseEnd; ++Base) { 4724 CXXRecordDecl *BaseClassDecl 4725 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4726 4727 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4728 DeclareImplicitCopyAssignment(BaseClassDecl); 4729 4730 if (CXXMethodDecl *CopyAssign 4731 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4732 ExceptSpec.CalledDecl(CopyAssign); 4733 } 4734 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4735 FieldEnd = ClassDecl->field_end(); 4736 Field != FieldEnd; 4737 ++Field) { 4738 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4739 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4740 CXXRecordDecl *FieldClassDecl 4741 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4742 4743 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4744 DeclareImplicitCopyAssignment(FieldClassDecl); 4745 4746 if (CXXMethodDecl *CopyAssign 4747 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4748 ExceptSpec.CalledDecl(CopyAssign); 4749 } 4750 } 4751 4752 // An implicitly-declared copy assignment operator is an inline public 4753 // member of its class. 4754 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4755 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4756 CXXMethodDecl *CopyAssignment 4757 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4758 Context.getFunctionType(RetType, &ArgType, 1, 4759 false, 0, 4760 ExceptSpec.hasExceptionSpecification(), 4761 ExceptSpec.hasAnyExceptionSpecification(), 4762 ExceptSpec.size(), 4763 ExceptSpec.data(), 4764 FunctionType::ExtInfo()), 4765 /*TInfo=*/0, /*isStatic=*/false, 4766 /*StorageClassAsWritten=*/FunctionDecl::None, 4767 /*isInline=*/true); 4768 CopyAssignment->setAccess(AS_public); 4769 CopyAssignment->setImplicit(); 4770 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4771 CopyAssignment->setCopyAssignment(true); 4772 4773 // Add the parameter to the operator. 4774 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4775 ClassDecl->getLocation(), 4776 /*Id=*/0, 4777 ArgType, /*TInfo=*/0, 4778 VarDecl::None, 4779 VarDecl::None, 0); 4780 CopyAssignment->setParams(&FromParam, 1); 4781 4782 // Note that we have added this copy-assignment operator. 4783 ClassDecl->setDeclaredCopyAssignment(true); 4784 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4785 4786 if (Scope *S = getScopeForContext(ClassDecl)) 4787 PushOnScopeChains(CopyAssignment, S, false); 4788 ClassDecl->addDecl(CopyAssignment); 4789 4790 AddOverriddenMethods(ClassDecl, CopyAssignment); 4791 return CopyAssignment; 4792} 4793 4794void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4795 CXXMethodDecl *CopyAssignOperator) { 4796 assert((CopyAssignOperator->isImplicit() && 4797 CopyAssignOperator->isOverloadedOperator() && 4798 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4799 !CopyAssignOperator->isUsed(false)) && 4800 "DefineImplicitCopyAssignment called for wrong function"); 4801 4802 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4803 4804 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4805 CopyAssignOperator->setInvalidDecl(); 4806 return; 4807 } 4808 4809 CopyAssignOperator->setUsed(); 4810 4811 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4812 ErrorTrap Trap(*this); 4813 4814 // C++0x [class.copy]p30: 4815 // The implicitly-defined or explicitly-defaulted copy assignment operator 4816 // for a non-union class X performs memberwise copy assignment of its 4817 // subobjects. The direct base classes of X are assigned first, in the 4818 // order of their declaration in the base-specifier-list, and then the 4819 // immediate non-static data members of X are assigned, in the order in 4820 // which they were declared in the class definition. 4821 4822 // The statements that form the synthesized function body. 4823 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4824 4825 // The parameter for the "other" object, which we are copying from. 4826 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4827 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4828 QualType OtherRefType = Other->getType(); 4829 if (const LValueReferenceType *OtherRef 4830 = OtherRefType->getAs<LValueReferenceType>()) { 4831 OtherRefType = OtherRef->getPointeeType(); 4832 OtherQuals = OtherRefType.getQualifiers(); 4833 } 4834 4835 // Our location for everything implicitly-generated. 4836 SourceLocation Loc = CopyAssignOperator->getLocation(); 4837 4838 // Construct a reference to the "other" object. We'll be using this 4839 // throughout the generated ASTs. 4840 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4841 assert(OtherRef && "Reference to parameter cannot fail!"); 4842 4843 // Construct the "this" pointer. We'll be using this throughout the generated 4844 // ASTs. 4845 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4846 assert(This && "Reference to this cannot fail!"); 4847 4848 // Assign base classes. 4849 bool Invalid = false; 4850 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4851 E = ClassDecl->bases_end(); Base != E; ++Base) { 4852 // Form the assignment: 4853 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4854 QualType BaseType = Base->getType().getUnqualifiedType(); 4855 CXXRecordDecl *BaseClassDecl = 0; 4856 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4857 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4858 else { 4859 Invalid = true; 4860 continue; 4861 } 4862 4863 CXXCastPath BasePath; 4864 BasePath.push_back(Base); 4865 4866 // Construct the "from" expression, which is an implicit cast to the 4867 // appropriately-qualified base type. 4868 Expr *From = OtherRef->Retain(); 4869 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4870 CastExpr::CK_UncheckedDerivedToBase, 4871 ImplicitCastExpr::LValue, &BasePath); 4872 4873 // Dereference "this". 4874 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4875 Owned(This->Retain())); 4876 4877 // Implicitly cast "this" to the appropriately-qualified base type. 4878 Expr *ToE = To.takeAs<Expr>(); 4879 ImpCastExprToType(ToE, 4880 Context.getCVRQualifiedType(BaseType, 4881 CopyAssignOperator->getTypeQualifiers()), 4882 CastExpr::CK_UncheckedDerivedToBase, 4883 ImplicitCastExpr::LValue, &BasePath); 4884 To = Owned(ToE); 4885 4886 // Build the copy. 4887 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4888 move(To), Owned(From), 4889 /*CopyingBaseSubobject=*/true); 4890 if (Copy.isInvalid()) { 4891 Diag(CurrentLocation, diag::note_member_synthesized_at) 4892 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4893 CopyAssignOperator->setInvalidDecl(); 4894 return; 4895 } 4896 4897 // Success! Record the copy. 4898 Statements.push_back(Copy.takeAs<Expr>()); 4899 } 4900 4901 // \brief Reference to the __builtin_memcpy function. 4902 Expr *BuiltinMemCpyRef = 0; 4903 // \brief Reference to the __builtin_objc_memmove_collectable function. 4904 Expr *CollectableMemCpyRef = 0; 4905 4906 // Assign non-static members. 4907 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4908 FieldEnd = ClassDecl->field_end(); 4909 Field != FieldEnd; ++Field) { 4910 // Check for members of reference type; we can't copy those. 4911 if (Field->getType()->isReferenceType()) { 4912 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4913 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4914 Diag(Field->getLocation(), diag::note_declared_at); 4915 Diag(CurrentLocation, diag::note_member_synthesized_at) 4916 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4917 Invalid = true; 4918 continue; 4919 } 4920 4921 // Check for members of const-qualified, non-class type. 4922 QualType BaseType = Context.getBaseElementType(Field->getType()); 4923 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4924 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4925 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4926 Diag(Field->getLocation(), diag::note_declared_at); 4927 Diag(CurrentLocation, diag::note_member_synthesized_at) 4928 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4929 Invalid = true; 4930 continue; 4931 } 4932 4933 QualType FieldType = Field->getType().getNonReferenceType(); 4934 if (FieldType->isIncompleteArrayType()) { 4935 assert(ClassDecl->hasFlexibleArrayMember() && 4936 "Incomplete array type is not valid"); 4937 continue; 4938 } 4939 4940 // Build references to the field in the object we're copying from and to. 4941 CXXScopeSpec SS; // Intentionally empty 4942 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4943 LookupMemberName); 4944 MemberLookup.addDecl(*Field); 4945 MemberLookup.resolveKind(); 4946 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4947 OtherRefType, 4948 Loc, /*IsArrow=*/false, 4949 SS, 0, MemberLookup, 0); 4950 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4951 This->getType(), 4952 Loc, /*IsArrow=*/true, 4953 SS, 0, MemberLookup, 0); 4954 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4955 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4956 4957 // If the field should be copied with __builtin_memcpy rather than via 4958 // explicit assignments, do so. This optimization only applies for arrays 4959 // of scalars and arrays of class type with trivial copy-assignment 4960 // operators. 4961 if (FieldType->isArrayType() && 4962 (!BaseType->isRecordType() || 4963 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4964 ->hasTrivialCopyAssignment())) { 4965 // Compute the size of the memory buffer to be copied. 4966 QualType SizeType = Context.getSizeType(); 4967 llvm::APInt Size(Context.getTypeSize(SizeType), 4968 Context.getTypeSizeInChars(BaseType).getQuantity()); 4969 for (const ConstantArrayType *Array 4970 = Context.getAsConstantArrayType(FieldType); 4971 Array; 4972 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4973 llvm::APInt ArraySize = Array->getSize(); 4974 ArraySize.zextOrTrunc(Size.getBitWidth()); 4975 Size *= ArraySize; 4976 } 4977 4978 // Take the address of the field references for "from" and "to". 4979 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4980 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4981 4982 bool NeedsCollectableMemCpy = 4983 (BaseType->isRecordType() && 4984 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4985 4986 if (NeedsCollectableMemCpy) { 4987 if (!CollectableMemCpyRef) { 4988 // Create a reference to the __builtin_objc_memmove_collectable function. 4989 LookupResult R(*this, 4990 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4991 Loc, LookupOrdinaryName); 4992 LookupName(R, TUScope, true); 4993 4994 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4995 if (!CollectableMemCpy) { 4996 // Something went horribly wrong earlier, and we will have 4997 // complained about it. 4998 Invalid = true; 4999 continue; 5000 } 5001 5002 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5003 CollectableMemCpy->getType(), 5004 Loc, 0).takeAs<Expr>(); 5005 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5006 } 5007 } 5008 // Create a reference to the __builtin_memcpy builtin function. 5009 else if (!BuiltinMemCpyRef) { 5010 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5011 LookupOrdinaryName); 5012 LookupName(R, TUScope, true); 5013 5014 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5015 if (!BuiltinMemCpy) { 5016 // Something went horribly wrong earlier, and we will have complained 5017 // about it. 5018 Invalid = true; 5019 continue; 5020 } 5021 5022 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5023 BuiltinMemCpy->getType(), 5024 Loc, 0).takeAs<Expr>(); 5025 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5026 } 5027 5028 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5029 CallArgs.push_back(To.takeAs<Expr>()); 5030 CallArgs.push_back(From.takeAs<Expr>()); 5031 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5032 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5033 Commas.push_back(Loc); 5034 Commas.push_back(Loc); 5035 OwningExprResult Call = ExprError(); 5036 if (NeedsCollectableMemCpy) 5037 Call = ActOnCallExpr(/*Scope=*/0, 5038 Owned(CollectableMemCpyRef->Retain()), 5039 Loc, move_arg(CallArgs), 5040 Commas.data(), Loc); 5041 else 5042 Call = ActOnCallExpr(/*Scope=*/0, 5043 Owned(BuiltinMemCpyRef->Retain()), 5044 Loc, move_arg(CallArgs), 5045 Commas.data(), Loc); 5046 5047 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5048 Statements.push_back(Call.takeAs<Expr>()); 5049 continue; 5050 } 5051 5052 // Build the copy of this field. 5053 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5054 move(To), move(From), 5055 /*CopyingBaseSubobject=*/false); 5056 if (Copy.isInvalid()) { 5057 Diag(CurrentLocation, diag::note_member_synthesized_at) 5058 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5059 CopyAssignOperator->setInvalidDecl(); 5060 return; 5061 } 5062 5063 // Success! Record the copy. 5064 Statements.push_back(Copy.takeAs<Stmt>()); 5065 } 5066 5067 if (!Invalid) { 5068 // Add a "return *this;" 5069 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5070 Owned(This->Retain())); 5071 5072 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5073 if (Return.isInvalid()) 5074 Invalid = true; 5075 else { 5076 Statements.push_back(Return.takeAs<Stmt>()); 5077 5078 if (Trap.hasErrorOccurred()) { 5079 Diag(CurrentLocation, diag::note_member_synthesized_at) 5080 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5081 Invalid = true; 5082 } 5083 } 5084 } 5085 5086 if (Invalid) { 5087 CopyAssignOperator->setInvalidDecl(); 5088 return; 5089 } 5090 5091 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5092 /*isStmtExpr=*/false); 5093 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5094 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5095} 5096 5097CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5098 CXXRecordDecl *ClassDecl) { 5099 // C++ [class.copy]p4: 5100 // If the class definition does not explicitly declare a copy 5101 // constructor, one is declared implicitly. 5102 5103 // C++ [class.copy]p5: 5104 // The implicitly-declared copy constructor for a class X will 5105 // have the form 5106 // 5107 // X::X(const X&) 5108 // 5109 // if 5110 bool HasConstCopyConstructor = true; 5111 5112 // -- each direct or virtual base class B of X has a copy 5113 // constructor whose first parameter is of type const B& or 5114 // const volatile B&, and 5115 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5116 BaseEnd = ClassDecl->bases_end(); 5117 HasConstCopyConstructor && Base != BaseEnd; 5118 ++Base) { 5119 // Virtual bases are handled below. 5120 if (Base->isVirtual()) 5121 continue; 5122 5123 CXXRecordDecl *BaseClassDecl 5124 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5125 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5126 DeclareImplicitCopyConstructor(BaseClassDecl); 5127 5128 HasConstCopyConstructor 5129 = BaseClassDecl->hasConstCopyConstructor(Context); 5130 } 5131 5132 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5133 BaseEnd = ClassDecl->vbases_end(); 5134 HasConstCopyConstructor && Base != BaseEnd; 5135 ++Base) { 5136 CXXRecordDecl *BaseClassDecl 5137 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5138 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5139 DeclareImplicitCopyConstructor(BaseClassDecl); 5140 5141 HasConstCopyConstructor 5142 = BaseClassDecl->hasConstCopyConstructor(Context); 5143 } 5144 5145 // -- for all the nonstatic data members of X that are of a 5146 // class type M (or array thereof), each such class type 5147 // has a copy constructor whose first parameter is of type 5148 // const M& or const volatile M&. 5149 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5150 FieldEnd = ClassDecl->field_end(); 5151 HasConstCopyConstructor && Field != FieldEnd; 5152 ++Field) { 5153 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5154 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5155 CXXRecordDecl *FieldClassDecl 5156 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5157 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5158 DeclareImplicitCopyConstructor(FieldClassDecl); 5159 5160 HasConstCopyConstructor 5161 = FieldClassDecl->hasConstCopyConstructor(Context); 5162 } 5163 } 5164 5165 // Otherwise, the implicitly declared copy constructor will have 5166 // the form 5167 // 5168 // X::X(X&) 5169 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5170 QualType ArgType = ClassType; 5171 if (HasConstCopyConstructor) 5172 ArgType = ArgType.withConst(); 5173 ArgType = Context.getLValueReferenceType(ArgType); 5174 5175 // C++ [except.spec]p14: 5176 // An implicitly declared special member function (Clause 12) shall have an 5177 // exception-specification. [...] 5178 ImplicitExceptionSpecification ExceptSpec(Context); 5179 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5180 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5181 BaseEnd = ClassDecl->bases_end(); 5182 Base != BaseEnd; 5183 ++Base) { 5184 // Virtual bases are handled below. 5185 if (Base->isVirtual()) 5186 continue; 5187 5188 CXXRecordDecl *BaseClassDecl 5189 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5190 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5191 DeclareImplicitCopyConstructor(BaseClassDecl); 5192 5193 if (CXXConstructorDecl *CopyConstructor 5194 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5195 ExceptSpec.CalledDecl(CopyConstructor); 5196 } 5197 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5198 BaseEnd = ClassDecl->vbases_end(); 5199 Base != BaseEnd; 5200 ++Base) { 5201 CXXRecordDecl *BaseClassDecl 5202 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5203 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5204 DeclareImplicitCopyConstructor(BaseClassDecl); 5205 5206 if (CXXConstructorDecl *CopyConstructor 5207 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5208 ExceptSpec.CalledDecl(CopyConstructor); 5209 } 5210 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5211 FieldEnd = ClassDecl->field_end(); 5212 Field != FieldEnd; 5213 ++Field) { 5214 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5215 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5216 CXXRecordDecl *FieldClassDecl 5217 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5218 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5219 DeclareImplicitCopyConstructor(FieldClassDecl); 5220 5221 if (CXXConstructorDecl *CopyConstructor 5222 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5223 ExceptSpec.CalledDecl(CopyConstructor); 5224 } 5225 } 5226 5227 // An implicitly-declared copy constructor is an inline public 5228 // member of its class. 5229 DeclarationName Name 5230 = Context.DeclarationNames.getCXXConstructorName( 5231 Context.getCanonicalType(ClassType)); 5232 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5233 CXXConstructorDecl *CopyConstructor 5234 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5235 Context.getFunctionType(Context.VoidTy, 5236 &ArgType, 1, 5237 false, 0, 5238 ExceptSpec.hasExceptionSpecification(), 5239 ExceptSpec.hasAnyExceptionSpecification(), 5240 ExceptSpec.size(), 5241 ExceptSpec.data(), 5242 FunctionType::ExtInfo()), 5243 /*TInfo=*/0, 5244 /*isExplicit=*/false, 5245 /*isInline=*/true, 5246 /*isImplicitlyDeclared=*/true); 5247 CopyConstructor->setAccess(AS_public); 5248 CopyConstructor->setImplicit(); 5249 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5250 5251 // Note that we have declared this constructor. 5252 ClassDecl->setDeclaredCopyConstructor(true); 5253 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5254 5255 // Add the parameter to the constructor. 5256 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5257 ClassDecl->getLocation(), 5258 /*IdentifierInfo=*/0, 5259 ArgType, /*TInfo=*/0, 5260 VarDecl::None, 5261 VarDecl::None, 0); 5262 CopyConstructor->setParams(&FromParam, 1); 5263 if (Scope *S = getScopeForContext(ClassDecl)) 5264 PushOnScopeChains(CopyConstructor, S, false); 5265 ClassDecl->addDecl(CopyConstructor); 5266 5267 return CopyConstructor; 5268} 5269 5270void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5271 CXXConstructorDecl *CopyConstructor, 5272 unsigned TypeQuals) { 5273 assert((CopyConstructor->isImplicit() && 5274 CopyConstructor->isCopyConstructor(TypeQuals) && 5275 !CopyConstructor->isUsed(false)) && 5276 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5277 5278 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5279 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5280 5281 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5282 ErrorTrap Trap(*this); 5283 5284 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5285 Trap.hasErrorOccurred()) { 5286 Diag(CurrentLocation, diag::note_member_synthesized_at) 5287 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5288 CopyConstructor->setInvalidDecl(); 5289 } else { 5290 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5291 CopyConstructor->getLocation(), 5292 MultiStmtArg(*this, 0, 0), 5293 /*isStmtExpr=*/false) 5294 .takeAs<Stmt>()); 5295 } 5296 5297 CopyConstructor->setUsed(); 5298} 5299 5300Sema::OwningExprResult 5301Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5302 CXXConstructorDecl *Constructor, 5303 MultiExprArg ExprArgs, 5304 bool RequiresZeroInit, 5305 CXXConstructExpr::ConstructionKind ConstructKind) { 5306 bool Elidable = false; 5307 5308 // C++0x [class.copy]p34: 5309 // When certain criteria are met, an implementation is allowed to 5310 // omit the copy/move construction of a class object, even if the 5311 // copy/move constructor and/or destructor for the object have 5312 // side effects. [...] 5313 // - when a temporary class object that has not been bound to a 5314 // reference (12.2) would be copied/moved to a class object 5315 // with the same cv-unqualified type, the copy/move operation 5316 // can be omitted by constructing the temporary object 5317 // directly into the target of the omitted copy/move 5318 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5319 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5320 Elidable = SubExpr->isTemporaryObject() && 5321 Context.hasSameUnqualifiedType(SubExpr->getType(), 5322 Context.getTypeDeclType(Constructor->getParent())); 5323 } 5324 5325 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5326 Elidable, move(ExprArgs), RequiresZeroInit, 5327 ConstructKind); 5328} 5329 5330/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5331/// including handling of its default argument expressions. 5332Sema::OwningExprResult 5333Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5334 CXXConstructorDecl *Constructor, bool Elidable, 5335 MultiExprArg ExprArgs, 5336 bool RequiresZeroInit, 5337 CXXConstructExpr::ConstructionKind ConstructKind) { 5338 unsigned NumExprs = ExprArgs.size(); 5339 Expr **Exprs = (Expr **)ExprArgs.release(); 5340 5341 MarkDeclarationReferenced(ConstructLoc, Constructor); 5342 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5343 Constructor, Elidable, Exprs, NumExprs, 5344 RequiresZeroInit, ConstructKind)); 5345} 5346 5347bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5348 CXXConstructorDecl *Constructor, 5349 MultiExprArg Exprs) { 5350 OwningExprResult TempResult = 5351 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5352 move(Exprs)); 5353 if (TempResult.isInvalid()) 5354 return true; 5355 5356 Expr *Temp = TempResult.takeAs<Expr>(); 5357 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5358 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5359 VD->setInit(Temp); 5360 5361 return false; 5362} 5363 5364void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5365 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5366 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5367 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5368 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5369 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5370 CheckDestructorAccess(VD->getLocation(), Destructor, 5371 PDiag(diag::err_access_dtor_var) 5372 << VD->getDeclName() 5373 << VD->getType()); 5374 5375 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5376 Diag(VD->getLocation(), diag::warn_global_destructor); 5377 } 5378} 5379 5380/// AddCXXDirectInitializerToDecl - This action is called immediately after 5381/// ActOnDeclarator, when a C++ direct initializer is present. 5382/// e.g: "int x(1);" 5383void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5384 SourceLocation LParenLoc, 5385 MultiExprArg Exprs, 5386 SourceLocation *CommaLocs, 5387 SourceLocation RParenLoc) { 5388 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5389 Decl *RealDecl = Dcl.getAs<Decl>(); 5390 5391 // If there is no declaration, there was an error parsing it. Just ignore 5392 // the initializer. 5393 if (RealDecl == 0) 5394 return; 5395 5396 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5397 if (!VDecl) { 5398 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5399 RealDecl->setInvalidDecl(); 5400 return; 5401 } 5402 5403 // We will represent direct-initialization similarly to copy-initialization: 5404 // int x(1); -as-> int x = 1; 5405 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5406 // 5407 // Clients that want to distinguish between the two forms, can check for 5408 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5409 // A major benefit is that clients that don't particularly care about which 5410 // exactly form was it (like the CodeGen) can handle both cases without 5411 // special case code. 5412 5413 // C++ 8.5p11: 5414 // The form of initialization (using parentheses or '=') is generally 5415 // insignificant, but does matter when the entity being initialized has a 5416 // class type. 5417 5418 if (!VDecl->getType()->isDependentType() && 5419 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5420 diag::err_typecheck_decl_incomplete_type)) { 5421 VDecl->setInvalidDecl(); 5422 return; 5423 } 5424 5425 // The variable can not have an abstract class type. 5426 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5427 diag::err_abstract_type_in_decl, 5428 AbstractVariableType)) 5429 VDecl->setInvalidDecl(); 5430 5431 const VarDecl *Def; 5432 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5433 Diag(VDecl->getLocation(), diag::err_redefinition) 5434 << VDecl->getDeclName(); 5435 Diag(Def->getLocation(), diag::note_previous_definition); 5436 VDecl->setInvalidDecl(); 5437 return; 5438 } 5439 5440 // If either the declaration has a dependent type or if any of the 5441 // expressions is type-dependent, we represent the initialization 5442 // via a ParenListExpr for later use during template instantiation. 5443 if (VDecl->getType()->isDependentType() || 5444 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5445 // Let clients know that initialization was done with a direct initializer. 5446 VDecl->setCXXDirectInitializer(true); 5447 5448 // Store the initialization expressions as a ParenListExpr. 5449 unsigned NumExprs = Exprs.size(); 5450 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5451 (Expr **)Exprs.release(), 5452 NumExprs, RParenLoc)); 5453 return; 5454 } 5455 5456 // Capture the variable that is being initialized and the style of 5457 // initialization. 5458 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5459 5460 // FIXME: Poor source location information. 5461 InitializationKind Kind 5462 = InitializationKind::CreateDirect(VDecl->getLocation(), 5463 LParenLoc, RParenLoc); 5464 5465 InitializationSequence InitSeq(*this, Entity, Kind, 5466 (Expr**)Exprs.get(), Exprs.size()); 5467 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5468 if (Result.isInvalid()) { 5469 VDecl->setInvalidDecl(); 5470 return; 5471 } 5472 5473 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5474 VDecl->setInit(Result.takeAs<Expr>()); 5475 VDecl->setCXXDirectInitializer(true); 5476 5477 if (!VDecl->isInvalidDecl() && 5478 !VDecl->getDeclContext()->isDependentContext() && 5479 VDecl->hasGlobalStorage() && 5480 !VDecl->getInit()->isConstantInitializer(Context, 5481 VDecl->getType()->isReferenceType())) 5482 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5483 << VDecl->getInit()->getSourceRange(); 5484 5485 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5486 FinalizeVarWithDestructor(VDecl, Record); 5487} 5488 5489/// \brief Given a constructor and the set of arguments provided for the 5490/// constructor, convert the arguments and add any required default arguments 5491/// to form a proper call to this constructor. 5492/// 5493/// \returns true if an error occurred, false otherwise. 5494bool 5495Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5496 MultiExprArg ArgsPtr, 5497 SourceLocation Loc, 5498 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5499 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5500 unsigned NumArgs = ArgsPtr.size(); 5501 Expr **Args = (Expr **)ArgsPtr.get(); 5502 5503 const FunctionProtoType *Proto 5504 = Constructor->getType()->getAs<FunctionProtoType>(); 5505 assert(Proto && "Constructor without a prototype?"); 5506 unsigned NumArgsInProto = Proto->getNumArgs(); 5507 5508 // If too few arguments are available, we'll fill in the rest with defaults. 5509 if (NumArgs < NumArgsInProto) 5510 ConvertedArgs.reserve(NumArgsInProto); 5511 else 5512 ConvertedArgs.reserve(NumArgs); 5513 5514 VariadicCallType CallType = 5515 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5516 llvm::SmallVector<Expr *, 8> AllArgs; 5517 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5518 Proto, 0, Args, NumArgs, AllArgs, 5519 CallType); 5520 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5521 ConvertedArgs.push_back(AllArgs[i]); 5522 return Invalid; 5523} 5524 5525static inline bool 5526CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5527 const FunctionDecl *FnDecl) { 5528 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5529 if (isa<NamespaceDecl>(DC)) { 5530 return SemaRef.Diag(FnDecl->getLocation(), 5531 diag::err_operator_new_delete_declared_in_namespace) 5532 << FnDecl->getDeclName(); 5533 } 5534 5535 if (isa<TranslationUnitDecl>(DC) && 5536 FnDecl->getStorageClass() == FunctionDecl::Static) { 5537 return SemaRef.Diag(FnDecl->getLocation(), 5538 diag::err_operator_new_delete_declared_static) 5539 << FnDecl->getDeclName(); 5540 } 5541 5542 return false; 5543} 5544 5545static inline bool 5546CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5547 CanQualType ExpectedResultType, 5548 CanQualType ExpectedFirstParamType, 5549 unsigned DependentParamTypeDiag, 5550 unsigned InvalidParamTypeDiag) { 5551 QualType ResultType = 5552 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5553 5554 // Check that the result type is not dependent. 5555 if (ResultType->isDependentType()) 5556 return SemaRef.Diag(FnDecl->getLocation(), 5557 diag::err_operator_new_delete_dependent_result_type) 5558 << FnDecl->getDeclName() << ExpectedResultType; 5559 5560 // Check that the result type is what we expect. 5561 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5562 return SemaRef.Diag(FnDecl->getLocation(), 5563 diag::err_operator_new_delete_invalid_result_type) 5564 << FnDecl->getDeclName() << ExpectedResultType; 5565 5566 // A function template must have at least 2 parameters. 5567 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5568 return SemaRef.Diag(FnDecl->getLocation(), 5569 diag::err_operator_new_delete_template_too_few_parameters) 5570 << FnDecl->getDeclName(); 5571 5572 // The function decl must have at least 1 parameter. 5573 if (FnDecl->getNumParams() == 0) 5574 return SemaRef.Diag(FnDecl->getLocation(), 5575 diag::err_operator_new_delete_too_few_parameters) 5576 << FnDecl->getDeclName(); 5577 5578 // Check the the first parameter type is not dependent. 5579 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5580 if (FirstParamType->isDependentType()) 5581 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5582 << FnDecl->getDeclName() << ExpectedFirstParamType; 5583 5584 // Check that the first parameter type is what we expect. 5585 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5586 ExpectedFirstParamType) 5587 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5588 << FnDecl->getDeclName() << ExpectedFirstParamType; 5589 5590 return false; 5591} 5592 5593static bool 5594CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5595 // C++ [basic.stc.dynamic.allocation]p1: 5596 // A program is ill-formed if an allocation function is declared in a 5597 // namespace scope other than global scope or declared static in global 5598 // scope. 5599 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5600 return true; 5601 5602 CanQualType SizeTy = 5603 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5604 5605 // C++ [basic.stc.dynamic.allocation]p1: 5606 // The return type shall be void*. The first parameter shall have type 5607 // std::size_t. 5608 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5609 SizeTy, 5610 diag::err_operator_new_dependent_param_type, 5611 diag::err_operator_new_param_type)) 5612 return true; 5613 5614 // C++ [basic.stc.dynamic.allocation]p1: 5615 // The first parameter shall not have an associated default argument. 5616 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5617 return SemaRef.Diag(FnDecl->getLocation(), 5618 diag::err_operator_new_default_arg) 5619 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5620 5621 return false; 5622} 5623 5624static bool 5625CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5626 // C++ [basic.stc.dynamic.deallocation]p1: 5627 // A program is ill-formed if deallocation functions are declared in a 5628 // namespace scope other than global scope or declared static in global 5629 // scope. 5630 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5631 return true; 5632 5633 // C++ [basic.stc.dynamic.deallocation]p2: 5634 // Each deallocation function shall return void and its first parameter 5635 // shall be void*. 5636 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5637 SemaRef.Context.VoidPtrTy, 5638 diag::err_operator_delete_dependent_param_type, 5639 diag::err_operator_delete_param_type)) 5640 return true; 5641 5642 return false; 5643} 5644 5645/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5646/// of this overloaded operator is well-formed. If so, returns false; 5647/// otherwise, emits appropriate diagnostics and returns true. 5648bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5649 assert(FnDecl && FnDecl->isOverloadedOperator() && 5650 "Expected an overloaded operator declaration"); 5651 5652 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5653 5654 // C++ [over.oper]p5: 5655 // The allocation and deallocation functions, operator new, 5656 // operator new[], operator delete and operator delete[], are 5657 // described completely in 3.7.3. The attributes and restrictions 5658 // found in the rest of this subclause do not apply to them unless 5659 // explicitly stated in 3.7.3. 5660 if (Op == OO_Delete || Op == OO_Array_Delete) 5661 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5662 5663 if (Op == OO_New || Op == OO_Array_New) 5664 return CheckOperatorNewDeclaration(*this, FnDecl); 5665 5666 // C++ [over.oper]p6: 5667 // An operator function shall either be a non-static member 5668 // function or be a non-member function and have at least one 5669 // parameter whose type is a class, a reference to a class, an 5670 // enumeration, or a reference to an enumeration. 5671 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5672 if (MethodDecl->isStatic()) 5673 return Diag(FnDecl->getLocation(), 5674 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5675 } else { 5676 bool ClassOrEnumParam = false; 5677 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5678 ParamEnd = FnDecl->param_end(); 5679 Param != ParamEnd; ++Param) { 5680 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5681 if (ParamType->isDependentType() || ParamType->isRecordType() || 5682 ParamType->isEnumeralType()) { 5683 ClassOrEnumParam = true; 5684 break; 5685 } 5686 } 5687 5688 if (!ClassOrEnumParam) 5689 return Diag(FnDecl->getLocation(), 5690 diag::err_operator_overload_needs_class_or_enum) 5691 << FnDecl->getDeclName(); 5692 } 5693 5694 // C++ [over.oper]p8: 5695 // An operator function cannot have default arguments (8.3.6), 5696 // except where explicitly stated below. 5697 // 5698 // Only the function-call operator allows default arguments 5699 // (C++ [over.call]p1). 5700 if (Op != OO_Call) { 5701 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5702 Param != FnDecl->param_end(); ++Param) { 5703 if ((*Param)->hasDefaultArg()) 5704 return Diag((*Param)->getLocation(), 5705 diag::err_operator_overload_default_arg) 5706 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5707 } 5708 } 5709 5710 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5711 { false, false, false } 5712#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5713 , { Unary, Binary, MemberOnly } 5714#include "clang/Basic/OperatorKinds.def" 5715 }; 5716 5717 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5718 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5719 bool MustBeMemberOperator = OperatorUses[Op][2]; 5720 5721 // C++ [over.oper]p8: 5722 // [...] Operator functions cannot have more or fewer parameters 5723 // than the number required for the corresponding operator, as 5724 // described in the rest of this subclause. 5725 unsigned NumParams = FnDecl->getNumParams() 5726 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5727 if (Op != OO_Call && 5728 ((NumParams == 1 && !CanBeUnaryOperator) || 5729 (NumParams == 2 && !CanBeBinaryOperator) || 5730 (NumParams < 1) || (NumParams > 2))) { 5731 // We have the wrong number of parameters. 5732 unsigned ErrorKind; 5733 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5734 ErrorKind = 2; // 2 -> unary or binary. 5735 } else if (CanBeUnaryOperator) { 5736 ErrorKind = 0; // 0 -> unary 5737 } else { 5738 assert(CanBeBinaryOperator && 5739 "All non-call overloaded operators are unary or binary!"); 5740 ErrorKind = 1; // 1 -> binary 5741 } 5742 5743 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5744 << FnDecl->getDeclName() << NumParams << ErrorKind; 5745 } 5746 5747 // Overloaded operators other than operator() cannot be variadic. 5748 if (Op != OO_Call && 5749 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5750 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5751 << FnDecl->getDeclName(); 5752 } 5753 5754 // Some operators must be non-static member functions. 5755 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5756 return Diag(FnDecl->getLocation(), 5757 diag::err_operator_overload_must_be_member) 5758 << FnDecl->getDeclName(); 5759 } 5760 5761 // C++ [over.inc]p1: 5762 // The user-defined function called operator++ implements the 5763 // prefix and postfix ++ operator. If this function is a member 5764 // function with no parameters, or a non-member function with one 5765 // parameter of class or enumeration type, it defines the prefix 5766 // increment operator ++ for objects of that type. If the function 5767 // is a member function with one parameter (which shall be of type 5768 // int) or a non-member function with two parameters (the second 5769 // of which shall be of type int), it defines the postfix 5770 // increment operator ++ for objects of that type. 5771 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5772 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5773 bool ParamIsInt = false; 5774 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5775 ParamIsInt = BT->getKind() == BuiltinType::Int; 5776 5777 if (!ParamIsInt) 5778 return Diag(LastParam->getLocation(), 5779 diag::err_operator_overload_post_incdec_must_be_int) 5780 << LastParam->getType() << (Op == OO_MinusMinus); 5781 } 5782 5783 // Notify the class if it got an assignment operator. 5784 if (Op == OO_Equal) { 5785 // Would have returned earlier otherwise. 5786 assert(isa<CXXMethodDecl>(FnDecl) && 5787 "Overloaded = not member, but not filtered."); 5788 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5789 Method->getParent()->addedAssignmentOperator(Context, Method); 5790 } 5791 5792 return false; 5793} 5794 5795/// CheckLiteralOperatorDeclaration - Check whether the declaration 5796/// of this literal operator function is well-formed. If so, returns 5797/// false; otherwise, emits appropriate diagnostics and returns true. 5798bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5799 DeclContext *DC = FnDecl->getDeclContext(); 5800 Decl::Kind Kind = DC->getDeclKind(); 5801 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5802 Kind != Decl::LinkageSpec) { 5803 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5804 << FnDecl->getDeclName(); 5805 return true; 5806 } 5807 5808 bool Valid = false; 5809 5810 // template <char...> type operator "" name() is the only valid template 5811 // signature, and the only valid signature with no parameters. 5812 if (FnDecl->param_size() == 0) { 5813 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5814 // Must have only one template parameter 5815 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5816 if (Params->size() == 1) { 5817 NonTypeTemplateParmDecl *PmDecl = 5818 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5819 5820 // The template parameter must be a char parameter pack. 5821 // FIXME: This test will always fail because non-type parameter packs 5822 // have not been implemented. 5823 if (PmDecl && PmDecl->isTemplateParameterPack() && 5824 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5825 Valid = true; 5826 } 5827 } 5828 } else { 5829 // Check the first parameter 5830 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5831 5832 QualType T = (*Param)->getType(); 5833 5834 // unsigned long long int, long double, and any character type are allowed 5835 // as the only parameters. 5836 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5837 Context.hasSameType(T, Context.LongDoubleTy) || 5838 Context.hasSameType(T, Context.CharTy) || 5839 Context.hasSameType(T, Context.WCharTy) || 5840 Context.hasSameType(T, Context.Char16Ty) || 5841 Context.hasSameType(T, Context.Char32Ty)) { 5842 if (++Param == FnDecl->param_end()) 5843 Valid = true; 5844 goto FinishedParams; 5845 } 5846 5847 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5848 const PointerType *PT = T->getAs<PointerType>(); 5849 if (!PT) 5850 goto FinishedParams; 5851 T = PT->getPointeeType(); 5852 if (!T.isConstQualified()) 5853 goto FinishedParams; 5854 T = T.getUnqualifiedType(); 5855 5856 // Move on to the second parameter; 5857 ++Param; 5858 5859 // If there is no second parameter, the first must be a const char * 5860 if (Param == FnDecl->param_end()) { 5861 if (Context.hasSameType(T, Context.CharTy)) 5862 Valid = true; 5863 goto FinishedParams; 5864 } 5865 5866 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5867 // are allowed as the first parameter to a two-parameter function 5868 if (!(Context.hasSameType(T, Context.CharTy) || 5869 Context.hasSameType(T, Context.WCharTy) || 5870 Context.hasSameType(T, Context.Char16Ty) || 5871 Context.hasSameType(T, Context.Char32Ty))) 5872 goto FinishedParams; 5873 5874 // The second and final parameter must be an std::size_t 5875 T = (*Param)->getType().getUnqualifiedType(); 5876 if (Context.hasSameType(T, Context.getSizeType()) && 5877 ++Param == FnDecl->param_end()) 5878 Valid = true; 5879 } 5880 5881 // FIXME: This diagnostic is absolutely terrible. 5882FinishedParams: 5883 if (!Valid) { 5884 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5885 << FnDecl->getDeclName(); 5886 return true; 5887 } 5888 5889 return false; 5890} 5891 5892/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5893/// linkage specification, including the language and (if present) 5894/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5895/// the location of the language string literal, which is provided 5896/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5897/// the '{' brace. Otherwise, this linkage specification does not 5898/// have any braces. 5899Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5900 SourceLocation ExternLoc, 5901 SourceLocation LangLoc, 5902 llvm::StringRef Lang, 5903 SourceLocation LBraceLoc) { 5904 LinkageSpecDecl::LanguageIDs Language; 5905 if (Lang == "\"C\"") 5906 Language = LinkageSpecDecl::lang_c; 5907 else if (Lang == "\"C++\"") 5908 Language = LinkageSpecDecl::lang_cxx; 5909 else { 5910 Diag(LangLoc, diag::err_bad_language); 5911 return DeclPtrTy(); 5912 } 5913 5914 // FIXME: Add all the various semantics of linkage specifications 5915 5916 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5917 LangLoc, Language, 5918 LBraceLoc.isValid()); 5919 CurContext->addDecl(D); 5920 PushDeclContext(S, D); 5921 return DeclPtrTy::make(D); 5922} 5923 5924/// ActOnFinishLinkageSpecification - Complete the definition of 5925/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5926/// valid, it's the position of the closing '}' brace in a linkage 5927/// specification that uses braces. 5928Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5929 DeclPtrTy LinkageSpec, 5930 SourceLocation RBraceLoc) { 5931 if (LinkageSpec) 5932 PopDeclContext(); 5933 return LinkageSpec; 5934} 5935 5936/// \brief Perform semantic analysis for the variable declaration that 5937/// occurs within a C++ catch clause, returning the newly-created 5938/// variable. 5939VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5940 TypeSourceInfo *TInfo, 5941 IdentifierInfo *Name, 5942 SourceLocation Loc, 5943 SourceRange Range) { 5944 bool Invalid = false; 5945 5946 // Arrays and functions decay. 5947 if (ExDeclType->isArrayType()) 5948 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5949 else if (ExDeclType->isFunctionType()) 5950 ExDeclType = Context.getPointerType(ExDeclType); 5951 5952 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5953 // The exception-declaration shall not denote a pointer or reference to an 5954 // incomplete type, other than [cv] void*. 5955 // N2844 forbids rvalue references. 5956 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5957 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5958 Invalid = true; 5959 } 5960 5961 // GCC allows catching pointers and references to incomplete types 5962 // as an extension; so do we, but we warn by default. 5963 5964 QualType BaseType = ExDeclType; 5965 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5966 unsigned DK = diag::err_catch_incomplete; 5967 bool IncompleteCatchIsInvalid = true; 5968 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5969 BaseType = Ptr->getPointeeType(); 5970 Mode = 1; 5971 DK = diag::ext_catch_incomplete_ptr; 5972 IncompleteCatchIsInvalid = false; 5973 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5974 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5975 BaseType = Ref->getPointeeType(); 5976 Mode = 2; 5977 DK = diag::ext_catch_incomplete_ref; 5978 IncompleteCatchIsInvalid = false; 5979 } 5980 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5981 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5982 IncompleteCatchIsInvalid) 5983 Invalid = true; 5984 5985 if (!Invalid && !ExDeclType->isDependentType() && 5986 RequireNonAbstractType(Loc, ExDeclType, 5987 diag::err_abstract_type_in_decl, 5988 AbstractVariableType)) 5989 Invalid = true; 5990 5991 // Only the non-fragile NeXT runtime currently supports C++ catches 5992 // of ObjC types, and no runtime supports catching ObjC types by value. 5993 if (!Invalid && getLangOptions().ObjC1) { 5994 QualType T = ExDeclType; 5995 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5996 T = RT->getPointeeType(); 5997 5998 if (T->isObjCObjectType()) { 5999 Diag(Loc, diag::err_objc_object_catch); 6000 Invalid = true; 6001 } else if (T->isObjCObjectPointerType()) { 6002 if (!getLangOptions().NeXTRuntime) { 6003 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6004 Invalid = true; 6005 } else if (!getLangOptions().ObjCNonFragileABI) { 6006 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6007 Invalid = true; 6008 } 6009 } 6010 } 6011 6012 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6013 Name, ExDeclType, TInfo, VarDecl::None, 6014 VarDecl::None); 6015 ExDecl->setExceptionVariable(true); 6016 6017 if (!Invalid) { 6018 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6019 // C++ [except.handle]p16: 6020 // The object declared in an exception-declaration or, if the 6021 // exception-declaration does not specify a name, a temporary (12.2) is 6022 // copy-initialized (8.5) from the exception object. [...] 6023 // The object is destroyed when the handler exits, after the destruction 6024 // of any automatic objects initialized within the handler. 6025 // 6026 // We just pretend to initialize the object with itself, then make sure 6027 // it can be destroyed later. 6028 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6029 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6030 Loc, ExDeclType, 0); 6031 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6032 SourceLocation()); 6033 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6034 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6035 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6036 if (Result.isInvalid()) 6037 Invalid = true; 6038 else 6039 FinalizeVarWithDestructor(ExDecl, RecordTy); 6040 } 6041 } 6042 6043 if (Invalid) 6044 ExDecl->setInvalidDecl(); 6045 6046 return ExDecl; 6047} 6048 6049/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6050/// handler. 6051Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6052 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6053 QualType ExDeclType = TInfo->getType(); 6054 6055 bool Invalid = D.isInvalidType(); 6056 IdentifierInfo *II = D.getIdentifier(); 6057 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6058 LookupOrdinaryName, 6059 ForRedeclaration)) { 6060 // The scope should be freshly made just for us. There is just no way 6061 // it contains any previous declaration. 6062 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6063 if (PrevDecl->isTemplateParameter()) { 6064 // Maybe we will complain about the shadowed template parameter. 6065 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6066 } 6067 } 6068 6069 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6070 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6071 << D.getCXXScopeSpec().getRange(); 6072 Invalid = true; 6073 } 6074 6075 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6076 D.getIdentifier(), 6077 D.getIdentifierLoc(), 6078 D.getDeclSpec().getSourceRange()); 6079 6080 if (Invalid) 6081 ExDecl->setInvalidDecl(); 6082 6083 // Add the exception declaration into this scope. 6084 if (II) 6085 PushOnScopeChains(ExDecl, S); 6086 else 6087 CurContext->addDecl(ExDecl); 6088 6089 ProcessDeclAttributes(S, ExDecl, D); 6090 return DeclPtrTy::make(ExDecl); 6091} 6092 6093Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6094 ExprArg assertexpr, 6095 ExprArg assertmessageexpr) { 6096 Expr *AssertExpr = (Expr *)assertexpr.get(); 6097 StringLiteral *AssertMessage = 6098 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6099 6100 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6101 llvm::APSInt Value(32); 6102 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6103 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6104 AssertExpr->getSourceRange(); 6105 return DeclPtrTy(); 6106 } 6107 6108 if (Value == 0) { 6109 Diag(AssertLoc, diag::err_static_assert_failed) 6110 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6111 } 6112 } 6113 6114 assertexpr.release(); 6115 assertmessageexpr.release(); 6116 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6117 AssertExpr, AssertMessage); 6118 6119 CurContext->addDecl(Decl); 6120 return DeclPtrTy::make(Decl); 6121} 6122 6123/// \brief Perform semantic analysis of the given friend type declaration. 6124/// 6125/// \returns A friend declaration that. 6126FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6127 TypeSourceInfo *TSInfo) { 6128 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6129 6130 QualType T = TSInfo->getType(); 6131 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6132 6133 if (!getLangOptions().CPlusPlus0x) { 6134 // C++03 [class.friend]p2: 6135 // An elaborated-type-specifier shall be used in a friend declaration 6136 // for a class.* 6137 // 6138 // * The class-key of the elaborated-type-specifier is required. 6139 if (!ActiveTemplateInstantiations.empty()) { 6140 // Do not complain about the form of friend template types during 6141 // template instantiation; we will already have complained when the 6142 // template was declared. 6143 } else if (!T->isElaboratedTypeSpecifier()) { 6144 // If we evaluated the type to a record type, suggest putting 6145 // a tag in front. 6146 if (const RecordType *RT = T->getAs<RecordType>()) { 6147 RecordDecl *RD = RT->getDecl(); 6148 6149 std::string InsertionText = std::string(" ") + RD->getKindName(); 6150 6151 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6152 << (unsigned) RD->getTagKind() 6153 << T 6154 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6155 InsertionText); 6156 } else { 6157 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6158 << T 6159 << SourceRange(FriendLoc, TypeRange.getEnd()); 6160 } 6161 } else if (T->getAs<EnumType>()) { 6162 Diag(FriendLoc, diag::ext_enum_friend) 6163 << T 6164 << SourceRange(FriendLoc, TypeRange.getEnd()); 6165 } 6166 } 6167 6168 // C++0x [class.friend]p3: 6169 // If the type specifier in a friend declaration designates a (possibly 6170 // cv-qualified) class type, that class is declared as a friend; otherwise, 6171 // the friend declaration is ignored. 6172 6173 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6174 // in [class.friend]p3 that we do not implement. 6175 6176 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6177} 6178 6179/// Handle a friend type declaration. This works in tandem with 6180/// ActOnTag. 6181/// 6182/// Notes on friend class templates: 6183/// 6184/// We generally treat friend class declarations as if they were 6185/// declaring a class. So, for example, the elaborated type specifier 6186/// in a friend declaration is required to obey the restrictions of a 6187/// class-head (i.e. no typedefs in the scope chain), template 6188/// parameters are required to match up with simple template-ids, &c. 6189/// However, unlike when declaring a template specialization, it's 6190/// okay to refer to a template specialization without an empty 6191/// template parameter declaration, e.g. 6192/// friend class A<T>::B<unsigned>; 6193/// We permit this as a special case; if there are any template 6194/// parameters present at all, require proper matching, i.e. 6195/// template <> template <class T> friend class A<int>::B; 6196Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6197 MultiTemplateParamsArg TempParams) { 6198 SourceLocation Loc = DS.getSourceRange().getBegin(); 6199 6200 assert(DS.isFriendSpecified()); 6201 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6202 6203 // Try to convert the decl specifier to a type. This works for 6204 // friend templates because ActOnTag never produces a ClassTemplateDecl 6205 // for a TUK_Friend. 6206 Declarator TheDeclarator(DS, Declarator::MemberContext); 6207 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6208 QualType T = TSI->getType(); 6209 if (TheDeclarator.isInvalidType()) 6210 return DeclPtrTy(); 6211 6212 // This is definitely an error in C++98. It's probably meant to 6213 // be forbidden in C++0x, too, but the specification is just 6214 // poorly written. 6215 // 6216 // The problem is with declarations like the following: 6217 // template <T> friend A<T>::foo; 6218 // where deciding whether a class C is a friend or not now hinges 6219 // on whether there exists an instantiation of A that causes 6220 // 'foo' to equal C. There are restrictions on class-heads 6221 // (which we declare (by fiat) elaborated friend declarations to 6222 // be) that makes this tractable. 6223 // 6224 // FIXME: handle "template <> friend class A<T>;", which 6225 // is possibly well-formed? Who even knows? 6226 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6227 Diag(Loc, diag::err_tagless_friend_type_template) 6228 << DS.getSourceRange(); 6229 return DeclPtrTy(); 6230 } 6231 6232 // C++98 [class.friend]p1: A friend of a class is a function 6233 // or class that is not a member of the class . . . 6234 // This is fixed in DR77, which just barely didn't make the C++03 6235 // deadline. It's also a very silly restriction that seriously 6236 // affects inner classes and which nobody else seems to implement; 6237 // thus we never diagnose it, not even in -pedantic. 6238 // 6239 // But note that we could warn about it: it's always useless to 6240 // friend one of your own members (it's not, however, worthless to 6241 // friend a member of an arbitrary specialization of your template). 6242 6243 Decl *D; 6244 if (unsigned NumTempParamLists = TempParams.size()) 6245 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6246 NumTempParamLists, 6247 (TemplateParameterList**) TempParams.release(), 6248 TSI, 6249 DS.getFriendSpecLoc()); 6250 else 6251 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6252 6253 if (!D) 6254 return DeclPtrTy(); 6255 6256 D->setAccess(AS_public); 6257 CurContext->addDecl(D); 6258 6259 return DeclPtrTy::make(D); 6260} 6261 6262Sema::DeclPtrTy 6263Sema::ActOnFriendFunctionDecl(Scope *S, 6264 Declarator &D, 6265 bool IsDefinition, 6266 MultiTemplateParamsArg TemplateParams) { 6267 const DeclSpec &DS = D.getDeclSpec(); 6268 6269 assert(DS.isFriendSpecified()); 6270 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6271 6272 SourceLocation Loc = D.getIdentifierLoc(); 6273 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6274 QualType T = TInfo->getType(); 6275 6276 // C++ [class.friend]p1 6277 // A friend of a class is a function or class.... 6278 // Note that this sees through typedefs, which is intended. 6279 // It *doesn't* see through dependent types, which is correct 6280 // according to [temp.arg.type]p3: 6281 // If a declaration acquires a function type through a 6282 // type dependent on a template-parameter and this causes 6283 // a declaration that does not use the syntactic form of a 6284 // function declarator to have a function type, the program 6285 // is ill-formed. 6286 if (!T->isFunctionType()) { 6287 Diag(Loc, diag::err_unexpected_friend); 6288 6289 // It might be worthwhile to try to recover by creating an 6290 // appropriate declaration. 6291 return DeclPtrTy(); 6292 } 6293 6294 // C++ [namespace.memdef]p3 6295 // - If a friend declaration in a non-local class first declares a 6296 // class or function, the friend class or function is a member 6297 // of the innermost enclosing namespace. 6298 // - The name of the friend is not found by simple name lookup 6299 // until a matching declaration is provided in that namespace 6300 // scope (either before or after the class declaration granting 6301 // friendship). 6302 // - If a friend function is called, its name may be found by the 6303 // name lookup that considers functions from namespaces and 6304 // classes associated with the types of the function arguments. 6305 // - When looking for a prior declaration of a class or a function 6306 // declared as a friend, scopes outside the innermost enclosing 6307 // namespace scope are not considered. 6308 6309 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6310 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6311 DeclarationName Name = NameInfo.getName(); 6312 assert(Name); 6313 6314 // The context we found the declaration in, or in which we should 6315 // create the declaration. 6316 DeclContext *DC; 6317 6318 // FIXME: handle local classes 6319 6320 // Recover from invalid scope qualifiers as if they just weren't there. 6321 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6322 ForRedeclaration); 6323 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6324 DC = computeDeclContext(ScopeQual); 6325 6326 // FIXME: handle dependent contexts 6327 if (!DC) return DeclPtrTy(); 6328 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6329 6330 LookupQualifiedName(Previous, DC); 6331 6332 // Ignore things found implicitly in the wrong scope. 6333 // TODO: better diagnostics for this case. Suggesting the right 6334 // qualified scope would be nice... 6335 LookupResult::Filter F = Previous.makeFilter(); 6336 while (F.hasNext()) { 6337 NamedDecl *D = F.next(); 6338 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6339 F.erase(); 6340 } 6341 F.done(); 6342 6343 if (Previous.empty()) { 6344 D.setInvalidType(); 6345 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6346 return DeclPtrTy(); 6347 } 6348 6349 // C++ [class.friend]p1: A friend of a class is a function or 6350 // class that is not a member of the class . . . 6351 if (DC->Equals(CurContext)) 6352 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6353 6354 // Otherwise walk out to the nearest namespace scope looking for matches. 6355 } else { 6356 // TODO: handle local class contexts. 6357 6358 DC = CurContext; 6359 while (true) { 6360 // Skip class contexts. If someone can cite chapter and verse 6361 // for this behavior, that would be nice --- it's what GCC and 6362 // EDG do, and it seems like a reasonable intent, but the spec 6363 // really only says that checks for unqualified existing 6364 // declarations should stop at the nearest enclosing namespace, 6365 // not that they should only consider the nearest enclosing 6366 // namespace. 6367 while (DC->isRecord()) 6368 DC = DC->getParent(); 6369 6370 LookupQualifiedName(Previous, DC); 6371 6372 // TODO: decide what we think about using declarations. 6373 if (!Previous.empty()) 6374 break; 6375 6376 if (DC->isFileContext()) break; 6377 DC = DC->getParent(); 6378 } 6379 6380 // C++ [class.friend]p1: A friend of a class is a function or 6381 // class that is not a member of the class . . . 6382 // C++0x changes this for both friend types and functions. 6383 // Most C++ 98 compilers do seem to give an error here, so 6384 // we do, too. 6385 if (!Previous.empty() && DC->Equals(CurContext) 6386 && !getLangOptions().CPlusPlus0x) 6387 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6388 } 6389 6390 if (DC->isFileContext()) { 6391 // This implies that it has to be an operator or function. 6392 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6393 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6394 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6395 Diag(Loc, diag::err_introducing_special_friend) << 6396 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6397 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6398 return DeclPtrTy(); 6399 } 6400 } 6401 6402 bool Redeclaration = false; 6403 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6404 move(TemplateParams), 6405 IsDefinition, 6406 Redeclaration); 6407 if (!ND) return DeclPtrTy(); 6408 6409 assert(ND->getDeclContext() == DC); 6410 assert(ND->getLexicalDeclContext() == CurContext); 6411 6412 // Add the function declaration to the appropriate lookup tables, 6413 // adjusting the redeclarations list as necessary. We don't 6414 // want to do this yet if the friending class is dependent. 6415 // 6416 // Also update the scope-based lookup if the target context's 6417 // lookup context is in lexical scope. 6418 if (!CurContext->isDependentContext()) { 6419 DC = DC->getLookupContext(); 6420 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6421 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6422 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6423 } 6424 6425 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6426 D.getIdentifierLoc(), ND, 6427 DS.getFriendSpecLoc()); 6428 FrD->setAccess(AS_public); 6429 CurContext->addDecl(FrD); 6430 6431 return DeclPtrTy::make(ND); 6432} 6433 6434void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6435 AdjustDeclIfTemplate(dcl); 6436 6437 Decl *Dcl = dcl.getAs<Decl>(); 6438 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6439 if (!Fn) { 6440 Diag(DelLoc, diag::err_deleted_non_function); 6441 return; 6442 } 6443 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6444 Diag(DelLoc, diag::err_deleted_decl_not_first); 6445 Diag(Prev->getLocation(), diag::note_previous_declaration); 6446 // If the declaration wasn't the first, we delete the function anyway for 6447 // recovery. 6448 } 6449 Fn->setDeleted(); 6450} 6451 6452static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6453 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6454 ++CI) { 6455 Stmt *SubStmt = *CI; 6456 if (!SubStmt) 6457 continue; 6458 if (isa<ReturnStmt>(SubStmt)) 6459 Self.Diag(SubStmt->getSourceRange().getBegin(), 6460 diag::err_return_in_constructor_handler); 6461 if (!isa<Expr>(SubStmt)) 6462 SearchForReturnInStmt(Self, SubStmt); 6463 } 6464} 6465 6466void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6467 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6468 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6469 SearchForReturnInStmt(*this, Handler); 6470 } 6471} 6472 6473bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6474 const CXXMethodDecl *Old) { 6475 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6476 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6477 6478 if (Context.hasSameType(NewTy, OldTy) || 6479 NewTy->isDependentType() || OldTy->isDependentType()) 6480 return false; 6481 6482 // Check if the return types are covariant 6483 QualType NewClassTy, OldClassTy; 6484 6485 /// Both types must be pointers or references to classes. 6486 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6487 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6488 NewClassTy = NewPT->getPointeeType(); 6489 OldClassTy = OldPT->getPointeeType(); 6490 } 6491 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6492 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6493 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6494 NewClassTy = NewRT->getPointeeType(); 6495 OldClassTy = OldRT->getPointeeType(); 6496 } 6497 } 6498 } 6499 6500 // The return types aren't either both pointers or references to a class type. 6501 if (NewClassTy.isNull()) { 6502 Diag(New->getLocation(), 6503 diag::err_different_return_type_for_overriding_virtual_function) 6504 << New->getDeclName() << NewTy << OldTy; 6505 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6506 6507 return true; 6508 } 6509 6510 // C++ [class.virtual]p6: 6511 // If the return type of D::f differs from the return type of B::f, the 6512 // class type in the return type of D::f shall be complete at the point of 6513 // declaration of D::f or shall be the class type D. 6514 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6515 if (!RT->isBeingDefined() && 6516 RequireCompleteType(New->getLocation(), NewClassTy, 6517 PDiag(diag::err_covariant_return_incomplete) 6518 << New->getDeclName())) 6519 return true; 6520 } 6521 6522 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6523 // Check if the new class derives from the old class. 6524 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6525 Diag(New->getLocation(), 6526 diag::err_covariant_return_not_derived) 6527 << New->getDeclName() << NewTy << OldTy; 6528 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6529 return true; 6530 } 6531 6532 // Check if we the conversion from derived to base is valid. 6533 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6534 diag::err_covariant_return_inaccessible_base, 6535 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6536 // FIXME: Should this point to the return type? 6537 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6538 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6539 return true; 6540 } 6541 } 6542 6543 // The qualifiers of the return types must be the same. 6544 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6545 Diag(New->getLocation(), 6546 diag::err_covariant_return_type_different_qualifications) 6547 << New->getDeclName() << NewTy << OldTy; 6548 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6549 return true; 6550 }; 6551 6552 6553 // The new class type must have the same or less qualifiers as the old type. 6554 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6555 Diag(New->getLocation(), 6556 diag::err_covariant_return_type_class_type_more_qualified) 6557 << New->getDeclName() << NewTy << OldTy; 6558 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6559 return true; 6560 }; 6561 6562 return false; 6563} 6564 6565bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6566 const CXXMethodDecl *Old) 6567{ 6568 if (Old->hasAttr<FinalAttr>()) { 6569 Diag(New->getLocation(), diag::err_final_function_overridden) 6570 << New->getDeclName(); 6571 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6572 return true; 6573 } 6574 6575 return false; 6576} 6577 6578/// \brief Mark the given method pure. 6579/// 6580/// \param Method the method to be marked pure. 6581/// 6582/// \param InitRange the source range that covers the "0" initializer. 6583bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6584 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6585 Method->setPure(); 6586 6587 // A class is abstract if at least one function is pure virtual. 6588 Method->getParent()->setAbstract(true); 6589 return false; 6590 } 6591 6592 if (!Method->isInvalidDecl()) 6593 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6594 << Method->getDeclName() << InitRange; 6595 return true; 6596} 6597 6598/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6599/// an initializer for the out-of-line declaration 'Dcl'. The scope 6600/// is a fresh scope pushed for just this purpose. 6601/// 6602/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6603/// static data member of class X, names should be looked up in the scope of 6604/// class X. 6605void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6606 // If there is no declaration, there was an error parsing it. 6607 Decl *D = Dcl.getAs<Decl>(); 6608 if (D == 0) return; 6609 6610 // We should only get called for declarations with scope specifiers, like: 6611 // int foo::bar; 6612 assert(D->isOutOfLine()); 6613 EnterDeclaratorContext(S, D->getDeclContext()); 6614} 6615 6616/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6617/// initializer for the out-of-line declaration 'Dcl'. 6618void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6619 // If there is no declaration, there was an error parsing it. 6620 Decl *D = Dcl.getAs<Decl>(); 6621 if (D == 0) return; 6622 6623 assert(D->isOutOfLine()); 6624 ExitDeclaratorContext(S); 6625} 6626 6627/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6628/// C++ if/switch/while/for statement. 6629/// e.g: "if (int x = f()) {...}" 6630Action::DeclResult 6631Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6632 // C++ 6.4p2: 6633 // The declarator shall not specify a function or an array. 6634 // The type-specifier-seq shall not contain typedef and shall not declare a 6635 // new class or enumeration. 6636 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6637 "Parser allowed 'typedef' as storage class of condition decl."); 6638 6639 TagDecl *OwnedTag = 0; 6640 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6641 QualType Ty = TInfo->getType(); 6642 6643 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6644 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6645 // would be created and CXXConditionDeclExpr wants a VarDecl. 6646 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6647 << D.getSourceRange(); 6648 return DeclResult(); 6649 } else if (OwnedTag && OwnedTag->isDefinition()) { 6650 // The type-specifier-seq shall not declare a new class or enumeration. 6651 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6652 } 6653 6654 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6655 if (!Dcl) 6656 return DeclResult(); 6657 6658 return Dcl; 6659} 6660 6661void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6662 bool DefinitionRequired) { 6663 // Ignore any vtable uses in unevaluated operands or for classes that do 6664 // not have a vtable. 6665 if (!Class->isDynamicClass() || Class->isDependentContext() || 6666 CurContext->isDependentContext() || 6667 ExprEvalContexts.back().Context == Unevaluated) 6668 return; 6669 6670 // Try to insert this class into the map. 6671 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6672 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6673 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6674 if (!Pos.second) { 6675 // If we already had an entry, check to see if we are promoting this vtable 6676 // to required a definition. If so, we need to reappend to the VTableUses 6677 // list, since we may have already processed the first entry. 6678 if (DefinitionRequired && !Pos.first->second) { 6679 Pos.first->second = true; 6680 } else { 6681 // Otherwise, we can early exit. 6682 return; 6683 } 6684 } 6685 6686 // Local classes need to have their virtual members marked 6687 // immediately. For all other classes, we mark their virtual members 6688 // at the end of the translation unit. 6689 if (Class->isLocalClass()) 6690 MarkVirtualMembersReferenced(Loc, Class); 6691 else 6692 VTableUses.push_back(std::make_pair(Class, Loc)); 6693} 6694 6695bool Sema::DefineUsedVTables() { 6696 // If any dynamic classes have their key function defined within 6697 // this translation unit, then those vtables are considered "used" and must 6698 // be emitted. 6699 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6700 if (const CXXMethodDecl *KeyFunction 6701 = Context.getKeyFunction(DynamicClasses[I])) { 6702 const FunctionDecl *Definition = 0; 6703 if (KeyFunction->hasBody(Definition)) 6704 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6705 } 6706 } 6707 6708 if (VTableUses.empty()) 6709 return false; 6710 6711 // Note: The VTableUses vector could grow as a result of marking 6712 // the members of a class as "used", so we check the size each 6713 // time through the loop and prefer indices (with are stable) to 6714 // iterators (which are not). 6715 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6716 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6717 if (!Class) 6718 continue; 6719 6720 SourceLocation Loc = VTableUses[I].second; 6721 6722 // If this class has a key function, but that key function is 6723 // defined in another translation unit, we don't need to emit the 6724 // vtable even though we're using it. 6725 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6726 if (KeyFunction && !KeyFunction->hasBody()) { 6727 switch (KeyFunction->getTemplateSpecializationKind()) { 6728 case TSK_Undeclared: 6729 case TSK_ExplicitSpecialization: 6730 case TSK_ExplicitInstantiationDeclaration: 6731 // The key function is in another translation unit. 6732 continue; 6733 6734 case TSK_ExplicitInstantiationDefinition: 6735 case TSK_ImplicitInstantiation: 6736 // We will be instantiating the key function. 6737 break; 6738 } 6739 } else if (!KeyFunction) { 6740 // If we have a class with no key function that is the subject 6741 // of an explicit instantiation declaration, suppress the 6742 // vtable; it will live with the explicit instantiation 6743 // definition. 6744 bool IsExplicitInstantiationDeclaration 6745 = Class->getTemplateSpecializationKind() 6746 == TSK_ExplicitInstantiationDeclaration; 6747 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6748 REnd = Class->redecls_end(); 6749 R != REnd; ++R) { 6750 TemplateSpecializationKind TSK 6751 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6752 if (TSK == TSK_ExplicitInstantiationDeclaration) 6753 IsExplicitInstantiationDeclaration = true; 6754 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6755 IsExplicitInstantiationDeclaration = false; 6756 break; 6757 } 6758 } 6759 6760 if (IsExplicitInstantiationDeclaration) 6761 continue; 6762 } 6763 6764 // Mark all of the virtual members of this class as referenced, so 6765 // that we can build a vtable. Then, tell the AST consumer that a 6766 // vtable for this class is required. 6767 MarkVirtualMembersReferenced(Loc, Class); 6768 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6769 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6770 6771 // Optionally warn if we're emitting a weak vtable. 6772 if (Class->getLinkage() == ExternalLinkage && 6773 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6774 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6775 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6776 } 6777 } 6778 VTableUses.clear(); 6779 6780 return true; 6781} 6782 6783void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6784 const CXXRecordDecl *RD) { 6785 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6786 e = RD->method_end(); i != e; ++i) { 6787 CXXMethodDecl *MD = *i; 6788 6789 // C++ [basic.def.odr]p2: 6790 // [...] A virtual member function is used if it is not pure. [...] 6791 if (MD->isVirtual() && !MD->isPure()) 6792 MarkDeclarationReferenced(Loc, MD); 6793 } 6794 6795 // Only classes that have virtual bases need a VTT. 6796 if (RD->getNumVBases() == 0) 6797 return; 6798 6799 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6800 e = RD->bases_end(); i != e; ++i) { 6801 const CXXRecordDecl *Base = 6802 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6803 if (Base->getNumVBases() == 0) 6804 continue; 6805 MarkVirtualMembersReferenced(Loc, Base); 6806 } 6807} 6808 6809/// SetIvarInitializers - This routine builds initialization ASTs for the 6810/// Objective-C implementation whose ivars need be initialized. 6811void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6812 if (!getLangOptions().CPlusPlus) 6813 return; 6814 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6815 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6816 CollectIvarsToConstructOrDestruct(OID, ivars); 6817 if (ivars.empty()) 6818 return; 6819 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6820 for (unsigned i = 0; i < ivars.size(); i++) { 6821 FieldDecl *Field = ivars[i]; 6822 if (Field->isInvalidDecl()) 6823 continue; 6824 6825 CXXBaseOrMemberInitializer *Member; 6826 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6827 InitializationKind InitKind = 6828 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6829 6830 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6831 Sema::OwningExprResult MemberInit = 6832 InitSeq.Perform(*this, InitEntity, InitKind, 6833 Sema::MultiExprArg(*this, 0, 0)); 6834 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6835 // Note, MemberInit could actually come back empty if no initialization 6836 // is required (e.g., because it would call a trivial default constructor) 6837 if (!MemberInit.get() || MemberInit.isInvalid()) 6838 continue; 6839 6840 Member = 6841 new (Context) CXXBaseOrMemberInitializer(Context, 6842 Field, SourceLocation(), 6843 SourceLocation(), 6844 MemberInit.takeAs<Expr>(), 6845 SourceLocation()); 6846 AllToInit.push_back(Member); 6847 6848 // Be sure that the destructor is accessible and is marked as referenced. 6849 if (const RecordType *RecordTy 6850 = Context.getBaseElementType(Field->getType()) 6851 ->getAs<RecordType>()) { 6852 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6853 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6854 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6855 CheckDestructorAccess(Field->getLocation(), Destructor, 6856 PDiag(diag::err_access_dtor_ivar) 6857 << Context.getBaseElementType(Field->getType())); 6858 } 6859 } 6860 } 6861 ObjCImplementation->setIvarInitializers(Context, 6862 AllToInit.data(), AllToInit.size()); 6863 } 6864} 6865