SemaDeclCXX.cpp revision 0629e6403126369d15585aeed9a7f6faf7f5cf17
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 CXXBaseSpecifierArray &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(Path[I].Base); 743} 744 745/// \brief Determine whether the given base path includes a virtual 746/// base class. 747bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 748 for (CXXBaseSpecifierArray::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 CXXBaseSpecifierArray *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 CXXBaseSpecifierArray *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 DeclarationName Name = GetNameForDeclarator(D); 897 Expr *BitWidth = static_cast<Expr*>(BW); 898 Expr *Init = static_cast<Expr*>(InitExpr); 899 SourceLocation Loc = D.getIdentifierLoc(); 900 901 assert(isa<CXXRecordDecl>(CurContext)); 902 assert(!DS.isFriendSpecified()); 903 904 bool isFunc = false; 905 if (D.isFunctionDeclarator()) 906 isFunc = true; 907 else if (D.getNumTypeObjects() == 0 && 908 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 909 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 910 isFunc = TDType->isFunctionType(); 911 } 912 913 // C++ 9.2p6: A member shall not be declared to have automatic storage 914 // duration (auto, register) or with the extern storage-class-specifier. 915 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 916 // data members and cannot be applied to names declared const or static, 917 // and cannot be applied to reference members. 918 switch (DS.getStorageClassSpec()) { 919 case DeclSpec::SCS_unspecified: 920 case DeclSpec::SCS_typedef: 921 case DeclSpec::SCS_static: 922 // FALL THROUGH. 923 break; 924 case DeclSpec::SCS_mutable: 925 if (isFunc) { 926 if (DS.getStorageClassSpecLoc().isValid()) 927 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 928 else 929 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 930 931 // FIXME: It would be nicer if the keyword was ignored only for this 932 // declarator. Otherwise we could get follow-up errors. 933 D.getMutableDeclSpec().ClearStorageClassSpecs(); 934 } 935 break; 936 default: 937 if (DS.getStorageClassSpecLoc().isValid()) 938 Diag(DS.getStorageClassSpecLoc(), 939 diag::err_storageclass_invalid_for_member); 940 else 941 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 943 } 944 945 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 946 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 947 !isFunc); 948 949 Decl *Member; 950 if (isInstField) { 951 // FIXME: Check for template parameters! 952 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 953 AS); 954 assert(Member && "HandleField never returns null"); 955 } else { 956 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 957 .getAs<Decl>(); 958 if (!Member) { 959 if (BitWidth) DeleteExpr(BitWidth); 960 return DeclPtrTy(); 961 } 962 963 // Non-instance-fields can't have a bitfield. 964 if (BitWidth) { 965 if (Member->isInvalidDecl()) { 966 // don't emit another diagnostic. 967 } else if (isa<VarDecl>(Member)) { 968 // C++ 9.6p3: A bit-field shall not be a static member. 969 // "static member 'A' cannot be a bit-field" 970 Diag(Loc, diag::err_static_not_bitfield) 971 << Name << BitWidth->getSourceRange(); 972 } else if (isa<TypedefDecl>(Member)) { 973 // "typedef member 'x' cannot be a bit-field" 974 Diag(Loc, diag::err_typedef_not_bitfield) 975 << Name << BitWidth->getSourceRange(); 976 } else { 977 // A function typedef ("typedef int f(); f a;"). 978 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 979 Diag(Loc, diag::err_not_integral_type_bitfield) 980 << Name << cast<ValueDecl>(Member)->getType() 981 << BitWidth->getSourceRange(); 982 } 983 984 DeleteExpr(BitWidth); 985 BitWidth = 0; 986 Member->setInvalidDecl(); 987 } 988 989 Member->setAccess(AS); 990 991 // If we have declared a member function template, set the access of the 992 // templated declaration as well. 993 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 994 FunTmpl->getTemplatedDecl()->setAccess(AS); 995 } 996 997 assert((Name || isInstField) && "No identifier for non-field ?"); 998 999 if (Init) 1000 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1001 if (Deleted) // FIXME: Source location is not very good. 1002 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1003 1004 if (isInstField) { 1005 FieldCollector->Add(cast<FieldDecl>(Member)); 1006 return DeclPtrTy(); 1007 } 1008 return DeclPtrTy::make(Member); 1009} 1010 1011/// \brief Find the direct and/or virtual base specifiers that 1012/// correspond to the given base type, for use in base initialization 1013/// within a constructor. 1014static bool FindBaseInitializer(Sema &SemaRef, 1015 CXXRecordDecl *ClassDecl, 1016 QualType BaseType, 1017 const CXXBaseSpecifier *&DirectBaseSpec, 1018 const CXXBaseSpecifier *&VirtualBaseSpec) { 1019 // First, check for a direct base class. 1020 DirectBaseSpec = 0; 1021 for (CXXRecordDecl::base_class_const_iterator Base 1022 = ClassDecl->bases_begin(); 1023 Base != ClassDecl->bases_end(); ++Base) { 1024 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1025 // We found a direct base of this type. That's what we're 1026 // initializing. 1027 DirectBaseSpec = &*Base; 1028 break; 1029 } 1030 } 1031 1032 // Check for a virtual base class. 1033 // FIXME: We might be able to short-circuit this if we know in advance that 1034 // there are no virtual bases. 1035 VirtualBaseSpec = 0; 1036 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1037 // We haven't found a base yet; search the class hierarchy for a 1038 // virtual base class. 1039 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1040 /*DetectVirtual=*/false); 1041 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1042 BaseType, Paths)) { 1043 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1044 Path != Paths.end(); ++Path) { 1045 if (Path->back().Base->isVirtual()) { 1046 VirtualBaseSpec = Path->back().Base; 1047 break; 1048 } 1049 } 1050 } 1051 } 1052 1053 return DirectBaseSpec || VirtualBaseSpec; 1054} 1055 1056/// ActOnMemInitializer - Handle a C++ member initializer. 1057Sema::MemInitResult 1058Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1059 Scope *S, 1060 CXXScopeSpec &SS, 1061 IdentifierInfo *MemberOrBase, 1062 TypeTy *TemplateTypeTy, 1063 SourceLocation IdLoc, 1064 SourceLocation LParenLoc, 1065 ExprTy **Args, unsigned NumArgs, 1066 SourceLocation *CommaLocs, 1067 SourceLocation RParenLoc) { 1068 if (!ConstructorD) 1069 return true; 1070 1071 AdjustDeclIfTemplate(ConstructorD); 1072 1073 CXXConstructorDecl *Constructor 1074 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1075 if (!Constructor) { 1076 // The user wrote a constructor initializer on a function that is 1077 // not a C++ constructor. Ignore the error for now, because we may 1078 // have more member initializers coming; we'll diagnose it just 1079 // once in ActOnMemInitializers. 1080 return true; 1081 } 1082 1083 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1084 1085 // C++ [class.base.init]p2: 1086 // Names in a mem-initializer-id are looked up in the scope of the 1087 // constructor’s class and, if not found in that scope, are looked 1088 // up in the scope containing the constructor’s 1089 // definition. [Note: if the constructor’s class contains a member 1090 // with the same name as a direct or virtual base class of the 1091 // class, a mem-initializer-id naming the member or base class and 1092 // composed of a single identifier refers to the class member. A 1093 // mem-initializer-id for the hidden base class may be specified 1094 // using a qualified name. ] 1095 if (!SS.getScopeRep() && !TemplateTypeTy) { 1096 // Look for a member, first. 1097 FieldDecl *Member = 0; 1098 DeclContext::lookup_result Result 1099 = ClassDecl->lookup(MemberOrBase); 1100 if (Result.first != Result.second) 1101 Member = dyn_cast<FieldDecl>(*Result.first); 1102 1103 // FIXME: Handle members of an anonymous union. 1104 1105 if (Member) 1106 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1107 LParenLoc, RParenLoc); 1108 } 1109 // It didn't name a member, so see if it names a class. 1110 QualType BaseType; 1111 TypeSourceInfo *TInfo = 0; 1112 1113 if (TemplateTypeTy) { 1114 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1115 } else { 1116 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1117 LookupParsedName(R, S, &SS); 1118 1119 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1120 if (!TyD) { 1121 if (R.isAmbiguous()) return true; 1122 1123 // We don't want access-control diagnostics here. 1124 R.suppressDiagnostics(); 1125 1126 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1127 bool NotUnknownSpecialization = false; 1128 DeclContext *DC = computeDeclContext(SS, false); 1129 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1130 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1131 1132 if (!NotUnknownSpecialization) { 1133 // When the scope specifier can refer to a member of an unknown 1134 // specialization, we take it as a type name. 1135 BaseType = CheckTypenameType(ETK_None, 1136 (NestedNameSpecifier *)SS.getScopeRep(), 1137 *MemberOrBase, SourceLocation(), 1138 SS.getRange(), IdLoc); 1139 if (BaseType.isNull()) 1140 return true; 1141 1142 R.clear(); 1143 R.setLookupName(MemberOrBase); 1144 } 1145 } 1146 1147 // If no results were found, try to correct typos. 1148 if (R.empty() && BaseType.isNull() && 1149 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1150 R.isSingleResult()) { 1151 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1152 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1153 // We have found a non-static data member with a similar 1154 // name to what was typed; complain and initialize that 1155 // member. 1156 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1157 << MemberOrBase << true << R.getLookupName() 1158 << FixItHint::CreateReplacement(R.getNameLoc(), 1159 R.getLookupName().getAsString()); 1160 Diag(Member->getLocation(), diag::note_previous_decl) 1161 << Member->getDeclName(); 1162 1163 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1164 LParenLoc, RParenLoc); 1165 } 1166 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1167 const CXXBaseSpecifier *DirectBaseSpec; 1168 const CXXBaseSpecifier *VirtualBaseSpec; 1169 if (FindBaseInitializer(*this, ClassDecl, 1170 Context.getTypeDeclType(Type), 1171 DirectBaseSpec, VirtualBaseSpec)) { 1172 // We have found a direct or virtual base class with a 1173 // similar name to what was typed; complain and initialize 1174 // that base class. 1175 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1176 << MemberOrBase << false << R.getLookupName() 1177 << FixItHint::CreateReplacement(R.getNameLoc(), 1178 R.getLookupName().getAsString()); 1179 1180 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1181 : VirtualBaseSpec; 1182 Diag(BaseSpec->getSourceRange().getBegin(), 1183 diag::note_base_class_specified_here) 1184 << BaseSpec->getType() 1185 << BaseSpec->getSourceRange(); 1186 1187 TyD = Type; 1188 } 1189 } 1190 } 1191 1192 if (!TyD && BaseType.isNull()) { 1193 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 return true; 1196 } 1197 } 1198 1199 if (BaseType.isNull()) { 1200 BaseType = Context.getTypeDeclType(TyD); 1201 if (SS.isSet()) { 1202 NestedNameSpecifier *Qualifier = 1203 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1204 1205 // FIXME: preserve source range information 1206 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1207 } 1208 } 1209 } 1210 1211 if (!TInfo) 1212 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1213 1214 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1215 LParenLoc, RParenLoc, ClassDecl); 1216} 1217 1218/// Checks an initializer expression for use of uninitialized fields, such as 1219/// containing the field that is being initialized. Returns true if there is an 1220/// uninitialized field was used an updates the SourceLocation parameter; false 1221/// otherwise. 1222static bool InitExprContainsUninitializedFields(const Stmt *S, 1223 const FieldDecl *LhsField, 1224 SourceLocation *L) { 1225 if (isa<CallExpr>(S)) { 1226 // Do not descend into function calls or constructors, as the use 1227 // of an uninitialized field may be valid. One would have to inspect 1228 // the contents of the function/ctor to determine if it is safe or not. 1229 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1230 // may be safe, depending on what the function/ctor does. 1231 return false; 1232 } 1233 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1234 const NamedDecl *RhsField = ME->getMemberDecl(); 1235 if (RhsField == LhsField) { 1236 // Initializing a field with itself. Throw a warning. 1237 // But wait; there are exceptions! 1238 // Exception #1: The field may not belong to this record. 1239 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1240 const Expr *base = ME->getBase(); 1241 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1242 // Even though the field matches, it does not belong to this record. 1243 return false; 1244 } 1245 // None of the exceptions triggered; return true to indicate an 1246 // uninitialized field was used. 1247 *L = ME->getMemberLoc(); 1248 return true; 1249 } 1250 } 1251 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1252 it != e; ++it) { 1253 if (!*it) { 1254 // An expression such as 'member(arg ?: "")' may trigger this. 1255 continue; 1256 } 1257 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1258 return true; 1259 } 1260 return false; 1261} 1262 1263Sema::MemInitResult 1264Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1265 unsigned NumArgs, SourceLocation IdLoc, 1266 SourceLocation LParenLoc, 1267 SourceLocation RParenLoc) { 1268 // Diagnose value-uses of fields to initialize themselves, e.g. 1269 // foo(foo) 1270 // where foo is not also a parameter to the constructor. 1271 // TODO: implement -Wuninitialized and fold this into that framework. 1272 for (unsigned i = 0; i < NumArgs; ++i) { 1273 SourceLocation L; 1274 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1275 // FIXME: Return true in the case when other fields are used before being 1276 // uninitialized. For example, let this field be the i'th field. When 1277 // initializing the i'th field, throw a warning if any of the >= i'th 1278 // fields are used, as they are not yet initialized. 1279 // Right now we are only handling the case where the i'th field uses 1280 // itself in its initializer. 1281 Diag(L, diag::warn_field_is_uninit); 1282 } 1283 } 1284 1285 bool HasDependentArg = false; 1286 for (unsigned i = 0; i < NumArgs; i++) 1287 HasDependentArg |= Args[i]->isTypeDependent(); 1288 1289 if (Member->getType()->isDependentType() || HasDependentArg) { 1290 // Can't check initialization for a member of dependent type or when 1291 // any of the arguments are type-dependent expressions. 1292 OwningExprResult Init 1293 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1294 RParenLoc)); 1295 1296 // Erase any temporaries within this evaluation context; we're not 1297 // going to track them in the AST, since we'll be rebuilding the 1298 // ASTs during template instantiation. 1299 ExprTemporaries.erase( 1300 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1301 ExprTemporaries.end()); 1302 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 1308 } 1309 1310 if (Member->isInvalidDecl()) 1311 return true; 1312 1313 // Initialize the member. 1314 InitializedEntity MemberEntity = 1315 InitializedEntity::InitializeMember(Member, 0); 1316 InitializationKind Kind = 1317 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1318 1319 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1320 1321 OwningExprResult MemberInit = 1322 InitSeq.Perform(*this, MemberEntity, Kind, 1323 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1324 if (MemberInit.isInvalid()) 1325 return true; 1326 1327 // C++0x [class.base.init]p7: 1328 // The initialization of each base and member constitutes a 1329 // full-expression. 1330 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // If we are in a dependent context, template instantiation will 1335 // perform this type-checking again. Just save the arguments that we 1336 // received in a ParenListExpr. 1337 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1338 // of the information that we have about the member 1339 // initializer. However, deconstructing the ASTs is a dicey process, 1340 // and this approach is far more likely to get the corner cases right. 1341 if (CurContext->isDependentContext()) { 1342 // Bump the reference count of all of the arguments. 1343 for (unsigned I = 0; I != NumArgs; ++I) 1344 Args[I]->Retain(); 1345 1346 OwningExprResult Init 1347 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1348 RParenLoc)); 1349 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1350 LParenLoc, 1351 Init.takeAs<Expr>(), 1352 RParenLoc); 1353 } 1354 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 MemberInit.takeAs<Expr>(), 1358 RParenLoc); 1359} 1360 1361Sema::MemInitResult 1362Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1363 Expr **Args, unsigned NumArgs, 1364 SourceLocation LParenLoc, SourceLocation RParenLoc, 1365 CXXRecordDecl *ClassDecl) { 1366 bool HasDependentArg = false; 1367 for (unsigned i = 0; i < NumArgs; i++) 1368 HasDependentArg |= Args[i]->isTypeDependent(); 1369 1370 SourceLocation BaseLoc 1371 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1372 1373 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1374 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1375 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1376 1377 // C++ [class.base.init]p2: 1378 // [...] Unless the mem-initializer-id names a nonstatic data 1379 // member of the constructor’s class or a direct or virtual base 1380 // of that class, the mem-initializer is ill-formed. A 1381 // mem-initializer-list can initialize a base class using any 1382 // name that denotes that base class type. 1383 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1384 1385 // Check for direct and virtual base classes. 1386 const CXXBaseSpecifier *DirectBaseSpec = 0; 1387 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1388 if (!Dependent) { 1389 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1390 VirtualBaseSpec); 1391 1392 // C++ [base.class.init]p2: 1393 // Unless the mem-initializer-id names a nonstatic data member of the 1394 // constructor's class or a direct or virtual base of that class, the 1395 // mem-initializer is ill-formed. 1396 if (!DirectBaseSpec && !VirtualBaseSpec) { 1397 // If the class has any dependent bases, then it's possible that 1398 // one of those types will resolve to the same type as 1399 // BaseType. Therefore, just treat this as a dependent base 1400 // class initialization. FIXME: Should we try to check the 1401 // initialization anyway? It seems odd. 1402 if (ClassDecl->hasAnyDependentBases()) 1403 Dependent = true; 1404 else 1405 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1406 << BaseType << Context.getTypeDeclType(ClassDecl) 1407 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1408 } 1409 } 1410 1411 if (Dependent) { 1412 // Can't check initialization for a base of dependent type or when 1413 // any of the arguments are type-dependent expressions. 1414 OwningExprResult BaseInit 1415 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1416 RParenLoc)); 1417 1418 // Erase any temporaries within this evaluation context; we're not 1419 // going to track them in the AST, since we'll be rebuilding the 1420 // ASTs during template instantiation. 1421 ExprTemporaries.erase( 1422 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1423 ExprTemporaries.end()); 1424 1425 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1426 /*IsVirtual=*/false, 1427 LParenLoc, 1428 BaseInit.takeAs<Expr>(), 1429 RParenLoc); 1430 } 1431 1432 // C++ [base.class.init]p2: 1433 // If a mem-initializer-id is ambiguous because it designates both 1434 // a direct non-virtual base class and an inherited virtual base 1435 // class, the mem-initializer is ill-formed. 1436 if (DirectBaseSpec && VirtualBaseSpec) 1437 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1438 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1439 1440 CXXBaseSpecifier *BaseSpec 1441 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1442 if (!BaseSpec) 1443 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1444 1445 // Initialize the base. 1446 InitializedEntity BaseEntity = 1447 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1448 InitializationKind Kind = 1449 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1450 1451 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1452 1453 OwningExprResult BaseInit = 1454 InitSeq.Perform(*this, BaseEntity, Kind, 1455 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 // C++0x [class.base.init]p7: 1460 // The initialization of each base and member constitutes a 1461 // full-expression. 1462 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1463 if (BaseInit.isInvalid()) 1464 return true; 1465 1466 // If we are in a dependent context, template instantiation will 1467 // perform this type-checking again. Just save the arguments that we 1468 // received in a ParenListExpr. 1469 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1470 // of the information that we have about the base 1471 // initializer. However, deconstructing the ASTs is a dicey process, 1472 // and this approach is far more likely to get the corner cases right. 1473 if (CurContext->isDependentContext()) { 1474 // Bump the reference count of all of the arguments. 1475 for (unsigned I = 0; I != NumArgs; ++I) 1476 Args[I]->Retain(); 1477 1478 OwningExprResult Init 1479 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1480 RParenLoc)); 1481 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1482 BaseSpec->isVirtual(), 1483 LParenLoc, 1484 Init.takeAs<Expr>(), 1485 RParenLoc); 1486 } 1487 1488 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1489 BaseSpec->isVirtual(), 1490 LParenLoc, 1491 BaseInit.takeAs<Expr>(), 1492 RParenLoc); 1493} 1494 1495/// ImplicitInitializerKind - How an implicit base or member initializer should 1496/// initialize its base or member. 1497enum ImplicitInitializerKind { 1498 IIK_Default, 1499 IIK_Copy, 1500 IIK_Move 1501}; 1502 1503static bool 1504BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1505 ImplicitInitializerKind ImplicitInitKind, 1506 CXXBaseSpecifier *BaseSpec, 1507 bool IsInheritedVirtualBase, 1508 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1509 InitializedEntity InitEntity 1510 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1511 IsInheritedVirtualBase); 1512 1513 Sema::OwningExprResult BaseInit(SemaRef); 1514 1515 switch (ImplicitInitKind) { 1516 case IIK_Default: { 1517 InitializationKind InitKind 1518 = InitializationKind::CreateDefault(Constructor->getLocation()); 1519 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1520 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1521 Sema::MultiExprArg(SemaRef, 0, 0)); 1522 break; 1523 } 1524 1525 case IIK_Copy: { 1526 ParmVarDecl *Param = Constructor->getParamDecl(0); 1527 QualType ParamType = Param->getType().getNonReferenceType(); 1528 1529 Expr *CopyCtorArg = 1530 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1531 Constructor->getLocation(), ParamType, 0); 1532 1533 // Cast to the base class to avoid ambiguities. 1534 QualType ArgTy = 1535 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1536 ParamType.getQualifiers()); 1537 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1538 CastExpr::CK_UncheckedDerivedToBase, 1539 ImplicitCastExpr::LValue, 1540 CXXBaseSpecifierArray(BaseSpec)); 1541 1542 InitializationKind InitKind 1543 = InitializationKind::CreateDirect(Constructor->getLocation(), 1544 SourceLocation(), SourceLocation()); 1545 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1546 &CopyCtorArg, 1); 1547 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1548 Sema::MultiExprArg(SemaRef, 1549 (void**)&CopyCtorArg, 1)); 1550 break; 1551 } 1552 1553 case IIK_Move: 1554 assert(false && "Unhandled initializer kind!"); 1555 } 1556 1557 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1558 if (BaseInit.isInvalid()) 1559 return true; 1560 1561 CXXBaseInit = 1562 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1563 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1564 SourceLocation()), 1565 BaseSpec->isVirtual(), 1566 SourceLocation(), 1567 BaseInit.takeAs<Expr>(), 1568 SourceLocation()); 1569 1570 return false; 1571} 1572 1573static bool 1574BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1575 ImplicitInitializerKind ImplicitInitKind, 1576 FieldDecl *Field, 1577 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1578 if (Field->isInvalidDecl()) 1579 return true; 1580 1581 SourceLocation Loc = Constructor->getLocation(); 1582 1583 if (ImplicitInitKind == IIK_Copy) { 1584 ParmVarDecl *Param = Constructor->getParamDecl(0); 1585 QualType ParamType = Param->getType().getNonReferenceType(); 1586 1587 Expr *MemberExprBase = 1588 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1589 Loc, ParamType, 0); 1590 1591 // Build a reference to this field within the parameter. 1592 CXXScopeSpec SS; 1593 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1594 Sema::LookupMemberName); 1595 MemberLookup.addDecl(Field, AS_public); 1596 MemberLookup.resolveKind(); 1597 Sema::OwningExprResult CopyCtorArg 1598 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1599 ParamType, Loc, 1600 /*IsArrow=*/false, 1601 SS, 1602 /*FirstQualifierInScope=*/0, 1603 MemberLookup, 1604 /*TemplateArgs=*/0); 1605 if (CopyCtorArg.isInvalid()) 1606 return true; 1607 1608 // When the field we are copying is an array, create index variables for 1609 // each dimension of the array. We use these index variables to subscript 1610 // the source array, and other clients (e.g., CodeGen) will perform the 1611 // necessary iteration with these index variables. 1612 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1613 QualType BaseType = Field->getType(); 1614 QualType SizeType = SemaRef.Context.getSizeType(); 1615 while (const ConstantArrayType *Array 1616 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1617 // Create the iteration variable for this array index. 1618 IdentifierInfo *IterationVarName = 0; 1619 { 1620 llvm::SmallString<8> Str; 1621 llvm::raw_svector_ostream OS(Str); 1622 OS << "__i" << IndexVariables.size(); 1623 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1624 } 1625 VarDecl *IterationVar 1626 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1627 IterationVarName, SizeType, 1628 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1629 VarDecl::None, VarDecl::None); 1630 IndexVariables.push_back(IterationVar); 1631 1632 // Create a reference to the iteration variable. 1633 Sema::OwningExprResult IterationVarRef 1634 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1635 assert(!IterationVarRef.isInvalid() && 1636 "Reference to invented variable cannot fail!"); 1637 1638 // Subscript the array with this iteration variable. 1639 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1640 Loc, 1641 move(IterationVarRef), 1642 Loc); 1643 if (CopyCtorArg.isInvalid()) 1644 return true; 1645 1646 BaseType = Array->getElementType(); 1647 } 1648 1649 // Construct the entity that we will be initializing. For an array, this 1650 // will be first element in the array, which may require several levels 1651 // of array-subscript entities. 1652 llvm::SmallVector<InitializedEntity, 4> Entities; 1653 Entities.reserve(1 + IndexVariables.size()); 1654 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1655 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1656 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1657 0, 1658 Entities.back())); 1659 1660 // Direct-initialize to use the copy constructor. 1661 InitializationKind InitKind = 1662 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1663 1664 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1665 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1666 &CopyCtorArgE, 1); 1667 1668 Sema::OwningExprResult MemberInit 1669 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1670 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1671 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1672 if (MemberInit.isInvalid()) 1673 return true; 1674 1675 CXXMemberInit 1676 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1677 MemberInit.takeAs<Expr>(), Loc, 1678 IndexVariables.data(), 1679 IndexVariables.size()); 1680 return false; 1681 } 1682 1683 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1684 1685 QualType FieldBaseElementType = 1686 SemaRef.Context.getBaseElementType(Field->getType()); 1687 1688 if (FieldBaseElementType->isRecordType()) { 1689 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1690 InitializationKind InitKind = 1691 InitializationKind::CreateDefault(Loc); 1692 1693 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1694 Sema::OwningExprResult MemberInit = 1695 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1696 Sema::MultiExprArg(SemaRef, 0, 0)); 1697 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1698 if (MemberInit.isInvalid()) 1699 return true; 1700 1701 CXXMemberInit = 1702 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1703 Field, Loc, Loc, 1704 MemberInit.takeAs<Expr>(), 1705 Loc); 1706 return false; 1707 } 1708 1709 if (FieldBaseElementType->isReferenceType()) { 1710 SemaRef.Diag(Constructor->getLocation(), 1711 diag::err_uninitialized_member_in_ctor) 1712 << (int)Constructor->isImplicit() 1713 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1714 << 0 << Field->getDeclName(); 1715 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1716 return true; 1717 } 1718 1719 if (FieldBaseElementType.isConstQualified()) { 1720 SemaRef.Diag(Constructor->getLocation(), 1721 diag::err_uninitialized_member_in_ctor) 1722 << (int)Constructor->isImplicit() 1723 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1724 << 1 << Field->getDeclName(); 1725 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1726 return true; 1727 } 1728 1729 // Nothing to initialize. 1730 CXXMemberInit = 0; 1731 return false; 1732} 1733 1734namespace { 1735struct BaseAndFieldInfo { 1736 Sema &S; 1737 CXXConstructorDecl *Ctor; 1738 bool AnyErrorsInInits; 1739 ImplicitInitializerKind IIK; 1740 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1741 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1742 1743 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1744 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1745 // FIXME: Handle implicit move constructors. 1746 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1747 IIK = IIK_Copy; 1748 else 1749 IIK = IIK_Default; 1750 } 1751}; 1752} 1753 1754static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1755 FieldDecl *Top, FieldDecl *Field, 1756 CXXBaseOrMemberInitializer *Init) { 1757 // If the member doesn't need to be initialized, Init will still be null. 1758 if (!Init) 1759 return; 1760 1761 Info.AllToInit.push_back(Init); 1762 if (Field != Top) { 1763 Init->setMember(Top); 1764 Init->setAnonUnionMember(Field); 1765 } 1766} 1767 1768static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1769 FieldDecl *Top, FieldDecl *Field) { 1770 1771 // Overwhelmingly common case: we have a direct initializer for this field. 1772 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1773 RecordFieldInitializer(Info, Top, Field, Init); 1774 return false; 1775 } 1776 1777 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1778 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1779 assert(FieldClassType && "anonymous struct/union without record type"); 1780 CXXRecordDecl *FieldClassDecl 1781 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1782 1783 // Even though union members never have non-trivial default 1784 // constructions in C++03, we still build member initializers for aggregate 1785 // record types which can be union members, and C++0x allows non-trivial 1786 // default constructors for union members, so we ensure that only one 1787 // member is initialized for these. 1788 if (FieldClassDecl->isUnion()) { 1789 // First check for an explicit initializer for one field. 1790 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1791 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1792 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1793 RecordFieldInitializer(Info, Top, *FA, Init); 1794 1795 // Once we've initialized a field of an anonymous union, the union 1796 // field in the class is also initialized, so exit immediately. 1797 return false; 1798 } 1799 } 1800 1801 // Fallthrough and construct a default initializer for the union as 1802 // a whole, which can call its default constructor if such a thing exists 1803 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1804 // behavior going forward with C++0x, when anonymous unions there are 1805 // finalized, we should revisit this. 1806 } else { 1807 // For structs, we simply descend through to initialize all members where 1808 // necessary. 1809 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1810 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1811 if (CollectFieldInitializer(Info, Top, *FA)) 1812 return true; 1813 } 1814 } 1815 } 1816 1817 // Don't try to build an implicit initializer if there were semantic 1818 // errors in any of the initializers (and therefore we might be 1819 // missing some that the user actually wrote). 1820 if (Info.AnyErrorsInInits) 1821 return false; 1822 1823 CXXBaseOrMemberInitializer *Init = 0; 1824 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1825 return true; 1826 1827 RecordFieldInitializer(Info, Top, Field, Init); 1828 return false; 1829} 1830 1831bool 1832Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1833 CXXBaseOrMemberInitializer **Initializers, 1834 unsigned NumInitializers, 1835 bool AnyErrors) { 1836 if (Constructor->getDeclContext()->isDependentContext()) { 1837 // Just store the initializers as written, they will be checked during 1838 // instantiation. 1839 if (NumInitializers > 0) { 1840 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1841 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1842 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1843 memcpy(baseOrMemberInitializers, Initializers, 1844 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1845 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1846 } 1847 1848 return false; 1849 } 1850 1851 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1852 1853 // We need to build the initializer AST according to order of construction 1854 // and not what user specified in the Initializers list. 1855 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1856 if (!ClassDecl) 1857 return true; 1858 1859 bool HadError = false; 1860 1861 for (unsigned i = 0; i < NumInitializers; i++) { 1862 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1863 1864 if (Member->isBaseInitializer()) 1865 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1866 else 1867 Info.AllBaseFields[Member->getMember()] = Member; 1868 } 1869 1870 // Keep track of the direct virtual bases. 1871 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1872 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1873 E = ClassDecl->bases_end(); I != E; ++I) { 1874 if (I->isVirtual()) 1875 DirectVBases.insert(I); 1876 } 1877 1878 // Push virtual bases before others. 1879 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1880 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1881 1882 if (CXXBaseOrMemberInitializer *Value 1883 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1884 Info.AllToInit.push_back(Value); 1885 } else if (!AnyErrors) { 1886 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1887 CXXBaseOrMemberInitializer *CXXBaseInit; 1888 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1889 VBase, IsInheritedVirtualBase, 1890 CXXBaseInit)) { 1891 HadError = true; 1892 continue; 1893 } 1894 1895 Info.AllToInit.push_back(CXXBaseInit); 1896 } 1897 } 1898 1899 // Non-virtual bases. 1900 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1901 E = ClassDecl->bases_end(); Base != E; ++Base) { 1902 // Virtuals are in the virtual base list and already constructed. 1903 if (Base->isVirtual()) 1904 continue; 1905 1906 if (CXXBaseOrMemberInitializer *Value 1907 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1908 Info.AllToInit.push_back(Value); 1909 } else if (!AnyErrors) { 1910 CXXBaseOrMemberInitializer *CXXBaseInit; 1911 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1912 Base, /*IsInheritedVirtualBase=*/false, 1913 CXXBaseInit)) { 1914 HadError = true; 1915 continue; 1916 } 1917 1918 Info.AllToInit.push_back(CXXBaseInit); 1919 } 1920 } 1921 1922 // Fields. 1923 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1924 E = ClassDecl->field_end(); Field != E; ++Field) { 1925 if ((*Field)->getType()->isIncompleteArrayType()) { 1926 assert(ClassDecl->hasFlexibleArrayMember() && 1927 "Incomplete array type is not valid"); 1928 continue; 1929 } 1930 if (CollectFieldInitializer(Info, *Field, *Field)) 1931 HadError = true; 1932 } 1933 1934 NumInitializers = Info.AllToInit.size(); 1935 if (NumInitializers > 0) { 1936 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1937 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1938 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1939 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1940 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1941 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1942 1943 // Constructors implicitly reference the base and member 1944 // destructors. 1945 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1946 Constructor->getParent()); 1947 } 1948 1949 return HadError; 1950} 1951 1952static void *GetKeyForTopLevelField(FieldDecl *Field) { 1953 // For anonymous unions, use the class declaration as the key. 1954 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1955 if (RT->getDecl()->isAnonymousStructOrUnion()) 1956 return static_cast<void *>(RT->getDecl()); 1957 } 1958 return static_cast<void *>(Field); 1959} 1960 1961static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1962 return Context.getCanonicalType(BaseType).getTypePtr(); 1963} 1964 1965static void *GetKeyForMember(ASTContext &Context, 1966 CXXBaseOrMemberInitializer *Member, 1967 bool MemberMaybeAnon = false) { 1968 if (!Member->isMemberInitializer()) 1969 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1970 1971 // For fields injected into the class via declaration of an anonymous union, 1972 // use its anonymous union class declaration as the unique key. 1973 FieldDecl *Field = Member->getMember(); 1974 1975 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1976 // data member of the class. Data member used in the initializer list is 1977 // in AnonUnionMember field. 1978 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1979 Field = Member->getAnonUnionMember(); 1980 1981 // If the field is a member of an anonymous struct or union, our key 1982 // is the anonymous record decl that's a direct child of the class. 1983 RecordDecl *RD = Field->getParent(); 1984 if (RD->isAnonymousStructOrUnion()) { 1985 while (true) { 1986 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1987 if (Parent->isAnonymousStructOrUnion()) 1988 RD = Parent; 1989 else 1990 break; 1991 } 1992 1993 return static_cast<void *>(RD); 1994 } 1995 1996 return static_cast<void *>(Field); 1997} 1998 1999static void 2000DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2001 const CXXConstructorDecl *Constructor, 2002 CXXBaseOrMemberInitializer **Inits, 2003 unsigned NumInits) { 2004 if (Constructor->getDeclContext()->isDependentContext()) 2005 return; 2006 2007 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2008 == Diagnostic::Ignored) 2009 return; 2010 2011 // Build the list of bases and members in the order that they'll 2012 // actually be initialized. The explicit initializers should be in 2013 // this same order but may be missing things. 2014 llvm::SmallVector<const void*, 32> IdealInitKeys; 2015 2016 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2017 2018 // 1. Virtual bases. 2019 for (CXXRecordDecl::base_class_const_iterator VBase = 2020 ClassDecl->vbases_begin(), 2021 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2022 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2023 2024 // 2. Non-virtual bases. 2025 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2026 E = ClassDecl->bases_end(); Base != E; ++Base) { 2027 if (Base->isVirtual()) 2028 continue; 2029 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2030 } 2031 2032 // 3. Direct fields. 2033 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2034 E = ClassDecl->field_end(); Field != E; ++Field) 2035 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2036 2037 unsigned NumIdealInits = IdealInitKeys.size(); 2038 unsigned IdealIndex = 0; 2039 2040 CXXBaseOrMemberInitializer *PrevInit = 0; 2041 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2042 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2043 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2044 2045 // Scan forward to try to find this initializer in the idealized 2046 // initializers list. 2047 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2048 if (InitKey == IdealInitKeys[IdealIndex]) 2049 break; 2050 2051 // If we didn't find this initializer, it must be because we 2052 // scanned past it on a previous iteration. That can only 2053 // happen if we're out of order; emit a warning. 2054 if (IdealIndex == NumIdealInits && PrevInit) { 2055 Sema::SemaDiagnosticBuilder D = 2056 SemaRef.Diag(PrevInit->getSourceLocation(), 2057 diag::warn_initializer_out_of_order); 2058 2059 if (PrevInit->isMemberInitializer()) 2060 D << 0 << PrevInit->getMember()->getDeclName(); 2061 else 2062 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2063 2064 if (Init->isMemberInitializer()) 2065 D << 0 << Init->getMember()->getDeclName(); 2066 else 2067 D << 1 << Init->getBaseClassInfo()->getType(); 2068 2069 // Move back to the initializer's location in the ideal list. 2070 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2071 if (InitKey == IdealInitKeys[IdealIndex]) 2072 break; 2073 2074 assert(IdealIndex != NumIdealInits && 2075 "initializer not found in initializer list"); 2076 } 2077 2078 PrevInit = Init; 2079 } 2080} 2081 2082namespace { 2083bool CheckRedundantInit(Sema &S, 2084 CXXBaseOrMemberInitializer *Init, 2085 CXXBaseOrMemberInitializer *&PrevInit) { 2086 if (!PrevInit) { 2087 PrevInit = Init; 2088 return false; 2089 } 2090 2091 if (FieldDecl *Field = Init->getMember()) 2092 S.Diag(Init->getSourceLocation(), 2093 diag::err_multiple_mem_initialization) 2094 << Field->getDeclName() 2095 << Init->getSourceRange(); 2096 else { 2097 Type *BaseClass = Init->getBaseClass(); 2098 assert(BaseClass && "neither field nor base"); 2099 S.Diag(Init->getSourceLocation(), 2100 diag::err_multiple_base_initialization) 2101 << QualType(BaseClass, 0) 2102 << Init->getSourceRange(); 2103 } 2104 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2105 << 0 << PrevInit->getSourceRange(); 2106 2107 return true; 2108} 2109 2110typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2111typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2112 2113bool CheckRedundantUnionInit(Sema &S, 2114 CXXBaseOrMemberInitializer *Init, 2115 RedundantUnionMap &Unions) { 2116 FieldDecl *Field = Init->getMember(); 2117 RecordDecl *Parent = Field->getParent(); 2118 if (!Parent->isAnonymousStructOrUnion()) 2119 return false; 2120 2121 NamedDecl *Child = Field; 2122 do { 2123 if (Parent->isUnion()) { 2124 UnionEntry &En = Unions[Parent]; 2125 if (En.first && En.first != Child) { 2126 S.Diag(Init->getSourceLocation(), 2127 diag::err_multiple_mem_union_initialization) 2128 << Field->getDeclName() 2129 << Init->getSourceRange(); 2130 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2131 << 0 << En.second->getSourceRange(); 2132 return true; 2133 } else if (!En.first) { 2134 En.first = Child; 2135 En.second = Init; 2136 } 2137 } 2138 2139 Child = Parent; 2140 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2141 } while (Parent->isAnonymousStructOrUnion()); 2142 2143 return false; 2144} 2145} 2146 2147/// ActOnMemInitializers - Handle the member initializers for a constructor. 2148void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2149 SourceLocation ColonLoc, 2150 MemInitTy **meminits, unsigned NumMemInits, 2151 bool AnyErrors) { 2152 if (!ConstructorDecl) 2153 return; 2154 2155 AdjustDeclIfTemplate(ConstructorDecl); 2156 2157 CXXConstructorDecl *Constructor 2158 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2159 2160 if (!Constructor) { 2161 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2162 return; 2163 } 2164 2165 CXXBaseOrMemberInitializer **MemInits = 2166 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2167 2168 // Mapping for the duplicate initializers check. 2169 // For member initializers, this is keyed with a FieldDecl*. 2170 // For base initializers, this is keyed with a Type*. 2171 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2172 2173 // Mapping for the inconsistent anonymous-union initializers check. 2174 RedundantUnionMap MemberUnions; 2175 2176 bool HadError = false; 2177 for (unsigned i = 0; i < NumMemInits; i++) { 2178 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2179 2180 // Set the source order index. 2181 Init->setSourceOrder(i); 2182 2183 if (Init->isMemberInitializer()) { 2184 FieldDecl *Field = Init->getMember(); 2185 if (CheckRedundantInit(*this, Init, Members[Field]) || 2186 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2187 HadError = true; 2188 } else { 2189 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2190 if (CheckRedundantInit(*this, Init, Members[Key])) 2191 HadError = true; 2192 } 2193 } 2194 2195 if (HadError) 2196 return; 2197 2198 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2199 2200 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2201} 2202 2203void 2204Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2205 CXXRecordDecl *ClassDecl) { 2206 // Ignore dependent contexts. 2207 if (ClassDecl->isDependentContext()) 2208 return; 2209 2210 // FIXME: all the access-control diagnostics are positioned on the 2211 // field/base declaration. That's probably good; that said, the 2212 // user might reasonably want to know why the destructor is being 2213 // emitted, and we currently don't say. 2214 2215 // Non-static data members. 2216 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2217 E = ClassDecl->field_end(); I != E; ++I) { 2218 FieldDecl *Field = *I; 2219 if (Field->isInvalidDecl()) 2220 continue; 2221 QualType FieldType = Context.getBaseElementType(Field->getType()); 2222 2223 const RecordType* RT = FieldType->getAs<RecordType>(); 2224 if (!RT) 2225 continue; 2226 2227 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2228 if (FieldClassDecl->hasTrivialDestructor()) 2229 continue; 2230 2231 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2232 CheckDestructorAccess(Field->getLocation(), Dtor, 2233 PDiag(diag::err_access_dtor_field) 2234 << Field->getDeclName() 2235 << FieldType); 2236 2237 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2238 } 2239 2240 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2241 2242 // Bases. 2243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2244 E = ClassDecl->bases_end(); Base != E; ++Base) { 2245 // Bases are always records in a well-formed non-dependent class. 2246 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2247 2248 // Remember direct virtual bases. 2249 if (Base->isVirtual()) 2250 DirectVirtualBases.insert(RT); 2251 2252 // Ignore trivial destructors. 2253 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2254 if (BaseClassDecl->hasTrivialDestructor()) 2255 continue; 2256 2257 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2258 2259 // FIXME: caret should be on the start of the class name 2260 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2261 PDiag(diag::err_access_dtor_base) 2262 << Base->getType() 2263 << Base->getSourceRange()); 2264 2265 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2266 } 2267 2268 // Virtual bases. 2269 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2270 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2271 2272 // Bases are always records in a well-formed non-dependent class. 2273 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2274 2275 // Ignore direct virtual bases. 2276 if (DirectVirtualBases.count(RT)) 2277 continue; 2278 2279 // Ignore trivial destructors. 2280 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2281 if (BaseClassDecl->hasTrivialDestructor()) 2282 continue; 2283 2284 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2285 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2286 PDiag(diag::err_access_dtor_vbase) 2287 << VBase->getType()); 2288 2289 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2290 } 2291} 2292 2293void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2294 if (!CDtorDecl) 2295 return; 2296 2297 if (CXXConstructorDecl *Constructor 2298 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2299 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2300} 2301 2302bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2303 unsigned DiagID, AbstractDiagSelID SelID, 2304 const CXXRecordDecl *CurrentRD) { 2305 if (SelID == -1) 2306 return RequireNonAbstractType(Loc, T, 2307 PDiag(DiagID), CurrentRD); 2308 else 2309 return RequireNonAbstractType(Loc, T, 2310 PDiag(DiagID) << SelID, CurrentRD); 2311} 2312 2313bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2314 const PartialDiagnostic &PD, 2315 const CXXRecordDecl *CurrentRD) { 2316 if (!getLangOptions().CPlusPlus) 2317 return false; 2318 2319 if (const ArrayType *AT = Context.getAsArrayType(T)) 2320 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2321 CurrentRD); 2322 2323 if (const PointerType *PT = T->getAs<PointerType>()) { 2324 // Find the innermost pointer type. 2325 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2326 PT = T; 2327 2328 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2329 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2330 } 2331 2332 const RecordType *RT = T->getAs<RecordType>(); 2333 if (!RT) 2334 return false; 2335 2336 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2337 2338 if (CurrentRD && CurrentRD != RD) 2339 return false; 2340 2341 // FIXME: is this reasonable? It matches current behavior, but.... 2342 if (!RD->getDefinition()) 2343 return false; 2344 2345 if (!RD->isAbstract()) 2346 return false; 2347 2348 Diag(Loc, PD) << RD->getDeclName(); 2349 2350 // Check if we've already emitted the list of pure virtual functions for this 2351 // class. 2352 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2353 return true; 2354 2355 CXXFinalOverriderMap FinalOverriders; 2356 RD->getFinalOverriders(FinalOverriders); 2357 2358 // Keep a set of seen pure methods so we won't diagnose the same method 2359 // more than once. 2360 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2361 2362 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2363 MEnd = FinalOverriders.end(); 2364 M != MEnd; 2365 ++M) { 2366 for (OverridingMethods::iterator SO = M->second.begin(), 2367 SOEnd = M->second.end(); 2368 SO != SOEnd; ++SO) { 2369 // C++ [class.abstract]p4: 2370 // A class is abstract if it contains or inherits at least one 2371 // pure virtual function for which the final overrider is pure 2372 // virtual. 2373 2374 // 2375 if (SO->second.size() != 1) 2376 continue; 2377 2378 if (!SO->second.front().Method->isPure()) 2379 continue; 2380 2381 if (!SeenPureMethods.insert(SO->second.front().Method)) 2382 continue; 2383 2384 Diag(SO->second.front().Method->getLocation(), 2385 diag::note_pure_virtual_function) 2386 << SO->second.front().Method->getDeclName(); 2387 } 2388 } 2389 2390 if (!PureVirtualClassDiagSet) 2391 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2392 PureVirtualClassDiagSet->insert(RD); 2393 2394 return true; 2395} 2396 2397namespace { 2398 class AbstractClassUsageDiagnoser 2399 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2400 Sema &SemaRef; 2401 CXXRecordDecl *AbstractClass; 2402 2403 bool VisitDeclContext(const DeclContext *DC) { 2404 bool Invalid = false; 2405 2406 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2407 E = DC->decls_end(); I != E; ++I) 2408 Invalid |= Visit(*I); 2409 2410 return Invalid; 2411 } 2412 2413 public: 2414 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2415 : SemaRef(SemaRef), AbstractClass(ac) { 2416 Visit(SemaRef.Context.getTranslationUnitDecl()); 2417 } 2418 2419 bool VisitFunctionDecl(const FunctionDecl *FD) { 2420 if (FD->isThisDeclarationADefinition()) { 2421 // No need to do the check if we're in a definition, because it requires 2422 // that the return/param types are complete. 2423 // because that requires 2424 return VisitDeclContext(FD); 2425 } 2426 2427 // Check the return type. 2428 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2429 bool Invalid = 2430 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2431 diag::err_abstract_type_in_decl, 2432 Sema::AbstractReturnType, 2433 AbstractClass); 2434 2435 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2436 E = FD->param_end(); I != E; ++I) { 2437 const ParmVarDecl *VD = *I; 2438 Invalid |= 2439 SemaRef.RequireNonAbstractType(VD->getLocation(), 2440 VD->getOriginalType(), 2441 diag::err_abstract_type_in_decl, 2442 Sema::AbstractParamType, 2443 AbstractClass); 2444 } 2445 2446 return Invalid; 2447 } 2448 2449 bool VisitDecl(const Decl* D) { 2450 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2451 return VisitDeclContext(DC); 2452 2453 return false; 2454 } 2455 }; 2456} 2457 2458/// \brief Perform semantic checks on a class definition that has been 2459/// completing, introducing implicitly-declared members, checking for 2460/// abstract types, etc. 2461void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2462 if (!Record || Record->isInvalidDecl()) 2463 return; 2464 2465 if (!Record->isDependentType()) 2466 AddImplicitlyDeclaredMembersToClass(Record); 2467 2468 if (Record->isInvalidDecl()) 2469 return; 2470 2471 // Set access bits correctly on the directly-declared conversions. 2472 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2473 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2474 Convs->setAccess(I, (*I)->getAccess()); 2475 2476 // Determine whether we need to check for final overriders. We do 2477 // this either when there are virtual base classes (in which case we 2478 // may end up finding multiple final overriders for a given virtual 2479 // function) or any of the base classes is abstract (in which case 2480 // we might detect that this class is abstract). 2481 bool CheckFinalOverriders = false; 2482 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2483 !Record->isDependentType()) { 2484 if (Record->getNumVBases()) 2485 CheckFinalOverriders = true; 2486 else if (!Record->isAbstract()) { 2487 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2488 BEnd = Record->bases_end(); 2489 B != BEnd; ++B) { 2490 CXXRecordDecl *BaseDecl 2491 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2492 if (BaseDecl->isAbstract()) { 2493 CheckFinalOverriders = true; 2494 break; 2495 } 2496 } 2497 } 2498 } 2499 2500 if (CheckFinalOverriders) { 2501 CXXFinalOverriderMap FinalOverriders; 2502 Record->getFinalOverriders(FinalOverriders); 2503 2504 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2505 MEnd = FinalOverriders.end(); 2506 M != MEnd; ++M) { 2507 for (OverridingMethods::iterator SO = M->second.begin(), 2508 SOEnd = M->second.end(); 2509 SO != SOEnd; ++SO) { 2510 assert(SO->second.size() > 0 && 2511 "All virtual functions have overridding virtual functions"); 2512 if (SO->second.size() == 1) { 2513 // C++ [class.abstract]p4: 2514 // A class is abstract if it contains or inherits at least one 2515 // pure virtual function for which the final overrider is pure 2516 // virtual. 2517 if (SO->second.front().Method->isPure()) 2518 Record->setAbstract(true); 2519 continue; 2520 } 2521 2522 // C++ [class.virtual]p2: 2523 // In a derived class, if a virtual member function of a base 2524 // class subobject has more than one final overrider the 2525 // program is ill-formed. 2526 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2527 << (NamedDecl *)M->first << Record; 2528 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2529 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2530 OMEnd = SO->second.end(); 2531 OM != OMEnd; ++OM) 2532 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2533 << (NamedDecl *)M->first << OM->Method->getParent(); 2534 2535 Record->setInvalidDecl(); 2536 } 2537 } 2538 } 2539 2540 if (Record->isAbstract() && !Record->isInvalidDecl()) 2541 (void)AbstractClassUsageDiagnoser(*this, Record); 2542 2543 // If this is not an aggregate type and has no user-declared constructor, 2544 // complain about any non-static data members of reference or const scalar 2545 // type, since they will never get initializers. 2546 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2547 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2548 bool Complained = false; 2549 for (RecordDecl::field_iterator F = Record->field_begin(), 2550 FEnd = Record->field_end(); 2551 F != FEnd; ++F) { 2552 if (F->getType()->isReferenceType() || 2553 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2554 if (!Complained) { 2555 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2556 << Record->getTagKind() << Record; 2557 Complained = true; 2558 } 2559 2560 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2561 << F->getType()->isReferenceType() 2562 << F->getDeclName(); 2563 } 2564 } 2565 } 2566 2567 if (Record->isDynamicClass()) 2568 DynamicClasses.push_back(Record); 2569} 2570 2571void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2572 DeclPtrTy TagDecl, 2573 SourceLocation LBrac, 2574 SourceLocation RBrac, 2575 AttributeList *AttrList) { 2576 if (!TagDecl) 2577 return; 2578 2579 AdjustDeclIfTemplate(TagDecl); 2580 2581 ActOnFields(S, RLoc, TagDecl, 2582 (DeclPtrTy*)FieldCollector->getCurFields(), 2583 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2584 2585 CheckCompletedCXXClass( 2586 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2587} 2588 2589namespace { 2590 /// \brief Helper class that collects exception specifications for 2591 /// implicitly-declared special member functions. 2592 class ImplicitExceptionSpecification { 2593 ASTContext &Context; 2594 bool AllowsAllExceptions; 2595 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2596 llvm::SmallVector<QualType, 4> Exceptions; 2597 2598 public: 2599 explicit ImplicitExceptionSpecification(ASTContext &Context) 2600 : Context(Context), AllowsAllExceptions(false) { } 2601 2602 /// \brief Whether the special member function should have any 2603 /// exception specification at all. 2604 bool hasExceptionSpecification() const { 2605 return !AllowsAllExceptions; 2606 } 2607 2608 /// \brief Whether the special member function should have a 2609 /// throw(...) exception specification (a Microsoft extension). 2610 bool hasAnyExceptionSpecification() const { 2611 return false; 2612 } 2613 2614 /// \brief The number of exceptions in the exception specification. 2615 unsigned size() const { return Exceptions.size(); } 2616 2617 /// \brief The set of exceptions in the exception specification. 2618 const QualType *data() const { return Exceptions.data(); } 2619 2620 /// \brief Note that 2621 void CalledDecl(CXXMethodDecl *Method) { 2622 // If we already know that we allow all exceptions, do nothing. 2623 if (AllowsAllExceptions || !Method) 2624 return; 2625 2626 const FunctionProtoType *Proto 2627 = Method->getType()->getAs<FunctionProtoType>(); 2628 2629 // If this function can throw any exceptions, make a note of that. 2630 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2631 AllowsAllExceptions = true; 2632 ExceptionsSeen.clear(); 2633 Exceptions.clear(); 2634 return; 2635 } 2636 2637 // Record the exceptions in this function's exception specification. 2638 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2639 EEnd = Proto->exception_end(); 2640 E != EEnd; ++E) 2641 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2642 Exceptions.push_back(*E); 2643 } 2644 }; 2645} 2646 2647 2648/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2649/// special functions, such as the default constructor, copy 2650/// constructor, or destructor, to the given C++ class (C++ 2651/// [special]p1). This routine can only be executed just before the 2652/// definition of the class is complete. 2653void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2654 if (!ClassDecl->hasUserDeclaredConstructor()) 2655 ++ASTContext::NumImplicitDefaultConstructors; 2656 2657 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2658 ++ASTContext::NumImplicitCopyConstructors; 2659 2660 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2661 ++ASTContext::NumImplicitCopyAssignmentOperators; 2662 2663 // If we have a dynamic class, then the copy assignment operator may be 2664 // virtual, so we have to declare it immediately. This ensures that, e.g., 2665 // it shows up in the right place in the vtable and that we diagnose 2666 // problems with the implicit exception specification. 2667 if (ClassDecl->isDynamicClass()) 2668 DeclareImplicitCopyAssignment(ClassDecl); 2669 } 2670 2671 if (!ClassDecl->hasUserDeclaredDestructor()) { 2672 ++ASTContext::NumImplicitDestructors; 2673 2674 // If we have a dynamic class, then the destructor may be virtual, so we 2675 // have to declare the destructor immediately. This ensures that, e.g., it 2676 // shows up in the right place in the vtable and that we diagnose problems 2677 // with the implicit exception specification. 2678 if (ClassDecl->isDynamicClass()) 2679 DeclareImplicitDestructor(ClassDecl); 2680 } 2681} 2682 2683void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2684 Decl *D = TemplateD.getAs<Decl>(); 2685 if (!D) 2686 return; 2687 2688 TemplateParameterList *Params = 0; 2689 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2690 Params = Template->getTemplateParameters(); 2691 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2692 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2693 Params = PartialSpec->getTemplateParameters(); 2694 else 2695 return; 2696 2697 for (TemplateParameterList::iterator Param = Params->begin(), 2698 ParamEnd = Params->end(); 2699 Param != ParamEnd; ++Param) { 2700 NamedDecl *Named = cast<NamedDecl>(*Param); 2701 if (Named->getDeclName()) { 2702 S->AddDecl(DeclPtrTy::make(Named)); 2703 IdResolver.AddDecl(Named); 2704 } 2705 } 2706} 2707 2708void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2709 if (!RecordD) return; 2710 AdjustDeclIfTemplate(RecordD); 2711 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2712 PushDeclContext(S, Record); 2713} 2714 2715void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2716 if (!RecordD) return; 2717 PopDeclContext(); 2718} 2719 2720/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2721/// parsing a top-level (non-nested) C++ class, and we are now 2722/// parsing those parts of the given Method declaration that could 2723/// not be parsed earlier (C++ [class.mem]p2), such as default 2724/// arguments. This action should enter the scope of the given 2725/// Method declaration as if we had just parsed the qualified method 2726/// name. However, it should not bring the parameters into scope; 2727/// that will be performed by ActOnDelayedCXXMethodParameter. 2728void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2729} 2730 2731/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2732/// C++ method declaration. We're (re-)introducing the given 2733/// function parameter into scope for use in parsing later parts of 2734/// the method declaration. For example, we could see an 2735/// ActOnParamDefaultArgument event for this parameter. 2736void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2737 if (!ParamD) 2738 return; 2739 2740 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2741 2742 // If this parameter has an unparsed default argument, clear it out 2743 // to make way for the parsed default argument. 2744 if (Param->hasUnparsedDefaultArg()) 2745 Param->setDefaultArg(0); 2746 2747 S->AddDecl(DeclPtrTy::make(Param)); 2748 if (Param->getDeclName()) 2749 IdResolver.AddDecl(Param); 2750} 2751 2752/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2753/// processing the delayed method declaration for Method. The method 2754/// declaration is now considered finished. There may be a separate 2755/// ActOnStartOfFunctionDef action later (not necessarily 2756/// immediately!) for this method, if it was also defined inside the 2757/// class body. 2758void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2759 if (!MethodD) 2760 return; 2761 2762 AdjustDeclIfTemplate(MethodD); 2763 2764 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2765 2766 // Now that we have our default arguments, check the constructor 2767 // again. It could produce additional diagnostics or affect whether 2768 // the class has implicitly-declared destructors, among other 2769 // things. 2770 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2771 CheckConstructor(Constructor); 2772 2773 // Check the default arguments, which we may have added. 2774 if (!Method->isInvalidDecl()) 2775 CheckCXXDefaultArguments(Method); 2776} 2777 2778/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2779/// the well-formedness of the constructor declarator @p D with type @p 2780/// R. If there are any errors in the declarator, this routine will 2781/// emit diagnostics and set the invalid bit to true. In any case, the type 2782/// will be updated to reflect a well-formed type for the constructor and 2783/// returned. 2784QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2785 FunctionDecl::StorageClass &SC) { 2786 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2787 2788 // C++ [class.ctor]p3: 2789 // A constructor shall not be virtual (10.3) or static (9.4). A 2790 // constructor can be invoked for a const, volatile or const 2791 // volatile object. A constructor shall not be declared const, 2792 // volatile, or const volatile (9.3.2). 2793 if (isVirtual) { 2794 if (!D.isInvalidType()) 2795 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2796 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2797 << SourceRange(D.getIdentifierLoc()); 2798 D.setInvalidType(); 2799 } 2800 if (SC == FunctionDecl::Static) { 2801 if (!D.isInvalidType()) 2802 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2803 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2804 << SourceRange(D.getIdentifierLoc()); 2805 D.setInvalidType(); 2806 SC = FunctionDecl::None; 2807 } 2808 2809 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2810 if (FTI.TypeQuals != 0) { 2811 if (FTI.TypeQuals & Qualifiers::Const) 2812 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2813 << "const" << SourceRange(D.getIdentifierLoc()); 2814 if (FTI.TypeQuals & Qualifiers::Volatile) 2815 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2816 << "volatile" << SourceRange(D.getIdentifierLoc()); 2817 if (FTI.TypeQuals & Qualifiers::Restrict) 2818 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2819 << "restrict" << SourceRange(D.getIdentifierLoc()); 2820 } 2821 2822 // Rebuild the function type "R" without any type qualifiers (in 2823 // case any of the errors above fired) and with "void" as the 2824 // return type, since constructors don't have return types. 2825 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2826 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2827 Proto->getNumArgs(), 2828 Proto->isVariadic(), 0, 2829 Proto->hasExceptionSpec(), 2830 Proto->hasAnyExceptionSpec(), 2831 Proto->getNumExceptions(), 2832 Proto->exception_begin(), 2833 Proto->getExtInfo()); 2834} 2835 2836/// CheckConstructor - Checks a fully-formed constructor for 2837/// well-formedness, issuing any diagnostics required. Returns true if 2838/// the constructor declarator is invalid. 2839void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2840 CXXRecordDecl *ClassDecl 2841 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2842 if (!ClassDecl) 2843 return Constructor->setInvalidDecl(); 2844 2845 // C++ [class.copy]p3: 2846 // A declaration of a constructor for a class X is ill-formed if 2847 // its first parameter is of type (optionally cv-qualified) X and 2848 // either there are no other parameters or else all other 2849 // parameters have default arguments. 2850 if (!Constructor->isInvalidDecl() && 2851 ((Constructor->getNumParams() == 1) || 2852 (Constructor->getNumParams() > 1 && 2853 Constructor->getParamDecl(1)->hasDefaultArg())) && 2854 Constructor->getTemplateSpecializationKind() 2855 != TSK_ImplicitInstantiation) { 2856 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2857 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2858 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2859 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2860 const char *ConstRef 2861 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2862 : " const &"; 2863 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2864 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2865 2866 // FIXME: Rather that making the constructor invalid, we should endeavor 2867 // to fix the type. 2868 Constructor->setInvalidDecl(); 2869 } 2870 } 2871 2872 // Notify the class that we've added a constructor. In principle we 2873 // don't need to do this for out-of-line declarations; in practice 2874 // we only instantiate the most recent declaration of a method, so 2875 // we have to call this for everything but friends. 2876 if (!Constructor->getFriendObjectKind()) 2877 ClassDecl->addedConstructor(Context, Constructor); 2878} 2879 2880/// CheckDestructor - Checks a fully-formed destructor definition for 2881/// well-formedness, issuing any diagnostics required. Returns true 2882/// on error. 2883bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2884 CXXRecordDecl *RD = Destructor->getParent(); 2885 2886 if (Destructor->isVirtual()) { 2887 SourceLocation Loc; 2888 2889 if (!Destructor->isImplicit()) 2890 Loc = Destructor->getLocation(); 2891 else 2892 Loc = RD->getLocation(); 2893 2894 // If we have a virtual destructor, look up the deallocation function 2895 FunctionDecl *OperatorDelete = 0; 2896 DeclarationName Name = 2897 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2898 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2899 return true; 2900 2901 MarkDeclarationReferenced(Loc, OperatorDelete); 2902 2903 Destructor->setOperatorDelete(OperatorDelete); 2904 } 2905 2906 return false; 2907} 2908 2909static inline bool 2910FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2911 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2912 FTI.ArgInfo[0].Param && 2913 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2914} 2915 2916/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2917/// the well-formednes of the destructor declarator @p D with type @p 2918/// R. If there are any errors in the declarator, this routine will 2919/// emit diagnostics and set the declarator to invalid. Even if this happens, 2920/// will be updated to reflect a well-formed type for the destructor and 2921/// returned. 2922QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2923 FunctionDecl::StorageClass& SC) { 2924 // C++ [class.dtor]p1: 2925 // [...] A typedef-name that names a class is a class-name 2926 // (7.1.3); however, a typedef-name that names a class shall not 2927 // be used as the identifier in the declarator for a destructor 2928 // declaration. 2929 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2930 if (isa<TypedefType>(DeclaratorType)) 2931 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2932 << DeclaratorType; 2933 2934 // C++ [class.dtor]p2: 2935 // A destructor is used to destroy objects of its class type. A 2936 // destructor takes no parameters, and no return type can be 2937 // specified for it (not even void). The address of a destructor 2938 // shall not be taken. A destructor shall not be static. A 2939 // destructor can be invoked for a const, volatile or const 2940 // volatile object. A destructor shall not be declared const, 2941 // volatile or const volatile (9.3.2). 2942 if (SC == FunctionDecl::Static) { 2943 if (!D.isInvalidType()) 2944 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2945 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2946 << SourceRange(D.getIdentifierLoc()) 2947 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2948 2949 SC = FunctionDecl::None; 2950 } 2951 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2952 // Destructors don't have return types, but the parser will 2953 // happily parse something like: 2954 // 2955 // class X { 2956 // float ~X(); 2957 // }; 2958 // 2959 // The return type will be eliminated later. 2960 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2961 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2962 << SourceRange(D.getIdentifierLoc()); 2963 } 2964 2965 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2966 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2967 if (FTI.TypeQuals & Qualifiers::Const) 2968 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2969 << "const" << SourceRange(D.getIdentifierLoc()); 2970 if (FTI.TypeQuals & Qualifiers::Volatile) 2971 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2972 << "volatile" << SourceRange(D.getIdentifierLoc()); 2973 if (FTI.TypeQuals & Qualifiers::Restrict) 2974 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2975 << "restrict" << SourceRange(D.getIdentifierLoc()); 2976 D.setInvalidType(); 2977 } 2978 2979 // Make sure we don't have any parameters. 2980 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2981 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2982 2983 // Delete the parameters. 2984 FTI.freeArgs(); 2985 D.setInvalidType(); 2986 } 2987 2988 // Make sure the destructor isn't variadic. 2989 if (FTI.isVariadic) { 2990 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2991 D.setInvalidType(); 2992 } 2993 2994 // Rebuild the function type "R" without any type qualifiers or 2995 // parameters (in case any of the errors above fired) and with 2996 // "void" as the return type, since destructors don't have return 2997 // types. 2998 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2999 if (!Proto) 3000 return QualType(); 3001 3002 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3003 Proto->hasExceptionSpec(), 3004 Proto->hasAnyExceptionSpec(), 3005 Proto->getNumExceptions(), 3006 Proto->exception_begin(), 3007 Proto->getExtInfo()); 3008} 3009 3010/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3011/// well-formednes of the conversion function declarator @p D with 3012/// type @p R. If there are any errors in the declarator, this routine 3013/// will emit diagnostics and return true. Otherwise, it will return 3014/// false. Either way, the type @p R will be updated to reflect a 3015/// well-formed type for the conversion operator. 3016void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3017 FunctionDecl::StorageClass& SC) { 3018 // C++ [class.conv.fct]p1: 3019 // Neither parameter types nor return type can be specified. The 3020 // type of a conversion function (8.3.5) is "function taking no 3021 // parameter returning conversion-type-id." 3022 if (SC == FunctionDecl::Static) { 3023 if (!D.isInvalidType()) 3024 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3025 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3026 << SourceRange(D.getIdentifierLoc()); 3027 D.setInvalidType(); 3028 SC = FunctionDecl::None; 3029 } 3030 3031 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3032 3033 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3034 // Conversion functions don't have return types, but the parser will 3035 // happily parse something like: 3036 // 3037 // class X { 3038 // float operator bool(); 3039 // }; 3040 // 3041 // The return type will be changed later anyway. 3042 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3043 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3044 << SourceRange(D.getIdentifierLoc()); 3045 D.setInvalidType(); 3046 } 3047 3048 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3049 3050 // Make sure we don't have any parameters. 3051 if (Proto->getNumArgs() > 0) { 3052 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3053 3054 // Delete the parameters. 3055 D.getTypeObject(0).Fun.freeArgs(); 3056 D.setInvalidType(); 3057 } else if (Proto->isVariadic()) { 3058 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3059 D.setInvalidType(); 3060 } 3061 3062 // Diagnose "&operator bool()" and other such nonsense. This 3063 // is actually a gcc extension which we don't support. 3064 if (Proto->getResultType() != ConvType) { 3065 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3066 << Proto->getResultType(); 3067 D.setInvalidType(); 3068 ConvType = Proto->getResultType(); 3069 } 3070 3071 // C++ [class.conv.fct]p4: 3072 // The conversion-type-id shall not represent a function type nor 3073 // an array type. 3074 if (ConvType->isArrayType()) { 3075 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3076 ConvType = Context.getPointerType(ConvType); 3077 D.setInvalidType(); 3078 } else if (ConvType->isFunctionType()) { 3079 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3080 ConvType = Context.getPointerType(ConvType); 3081 D.setInvalidType(); 3082 } 3083 3084 // Rebuild the function type "R" without any parameters (in case any 3085 // of the errors above fired) and with the conversion type as the 3086 // return type. 3087 if (D.isInvalidType()) { 3088 R = Context.getFunctionType(ConvType, 0, 0, false, 3089 Proto->getTypeQuals(), 3090 Proto->hasExceptionSpec(), 3091 Proto->hasAnyExceptionSpec(), 3092 Proto->getNumExceptions(), 3093 Proto->exception_begin(), 3094 Proto->getExtInfo()); 3095 } 3096 3097 // C++0x explicit conversion operators. 3098 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3099 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3100 diag::warn_explicit_conversion_functions) 3101 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3102} 3103 3104/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3105/// the declaration of the given C++ conversion function. This routine 3106/// is responsible for recording the conversion function in the C++ 3107/// class, if possible. 3108Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3109 assert(Conversion && "Expected to receive a conversion function declaration"); 3110 3111 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3112 3113 // Make sure we aren't redeclaring the conversion function. 3114 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3115 3116 // C++ [class.conv.fct]p1: 3117 // [...] A conversion function is never used to convert a 3118 // (possibly cv-qualified) object to the (possibly cv-qualified) 3119 // same object type (or a reference to it), to a (possibly 3120 // cv-qualified) base class of that type (or a reference to it), 3121 // or to (possibly cv-qualified) void. 3122 // FIXME: Suppress this warning if the conversion function ends up being a 3123 // virtual function that overrides a virtual function in a base class. 3124 QualType ClassType 3125 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3126 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3127 ConvType = ConvTypeRef->getPointeeType(); 3128 if (ConvType->isRecordType()) { 3129 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3130 if (ConvType == ClassType) 3131 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3132 << ClassType; 3133 else if (IsDerivedFrom(ClassType, ConvType)) 3134 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3135 << ClassType << ConvType; 3136 } else if (ConvType->isVoidType()) { 3137 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3138 << ClassType << ConvType; 3139 } 3140 3141 if (Conversion->getPrimaryTemplate()) { 3142 // ignore specializations 3143 } else if (Conversion->getPreviousDeclaration()) { 3144 if (FunctionTemplateDecl *ConversionTemplate 3145 = Conversion->getDescribedFunctionTemplate()) { 3146 if (ClassDecl->replaceConversion( 3147 ConversionTemplate->getPreviousDeclaration(), 3148 ConversionTemplate)) 3149 return DeclPtrTy::make(ConversionTemplate); 3150 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3151 Conversion)) 3152 return DeclPtrTy::make(Conversion); 3153 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3154 } else if (FunctionTemplateDecl *ConversionTemplate 3155 = Conversion->getDescribedFunctionTemplate()) 3156 ClassDecl->addConversionFunction(ConversionTemplate); 3157 else 3158 ClassDecl->addConversionFunction(Conversion); 3159 3160 return DeclPtrTy::make(Conversion); 3161} 3162 3163//===----------------------------------------------------------------------===// 3164// Namespace Handling 3165//===----------------------------------------------------------------------===// 3166 3167/// ActOnStartNamespaceDef - This is called at the start of a namespace 3168/// definition. 3169Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3170 SourceLocation IdentLoc, 3171 IdentifierInfo *II, 3172 SourceLocation LBrace, 3173 AttributeList *AttrList) { 3174 NamespaceDecl *Namespc = 3175 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3176 Namespc->setLBracLoc(LBrace); 3177 3178 Scope *DeclRegionScope = NamespcScope->getParent(); 3179 3180 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3181 3182 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3183 PushPragmaVisibility(attr->getVisibility()); 3184 3185 if (II) { 3186 // C++ [namespace.def]p2: 3187 // The identifier in an original-namespace-definition shall not have been 3188 // previously defined in the declarative region in which the 3189 // original-namespace-definition appears. The identifier in an 3190 // original-namespace-definition is the name of the namespace. Subsequently 3191 // in that declarative region, it is treated as an original-namespace-name. 3192 3193 NamedDecl *PrevDecl 3194 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3195 ForRedeclaration); 3196 3197 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3198 // This is an extended namespace definition. 3199 // Attach this namespace decl to the chain of extended namespace 3200 // definitions. 3201 OrigNS->setNextNamespace(Namespc); 3202 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3203 3204 // Remove the previous declaration from the scope. 3205 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3206 IdResolver.RemoveDecl(OrigNS); 3207 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3208 } 3209 } else if (PrevDecl) { 3210 // This is an invalid name redefinition. 3211 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3212 << Namespc->getDeclName(); 3213 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3214 Namespc->setInvalidDecl(); 3215 // Continue on to push Namespc as current DeclContext and return it. 3216 } else if (II->isStr("std") && 3217 CurContext->getLookupContext()->isTranslationUnit()) { 3218 // This is the first "real" definition of the namespace "std", so update 3219 // our cache of the "std" namespace to point at this definition. 3220 if (NamespaceDecl *StdNS = getStdNamespace()) { 3221 // We had already defined a dummy namespace "std". Link this new 3222 // namespace definition to the dummy namespace "std". 3223 StdNS->setNextNamespace(Namespc); 3224 StdNS->setLocation(IdentLoc); 3225 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3226 } 3227 3228 // Make our StdNamespace cache point at the first real definition of the 3229 // "std" namespace. 3230 StdNamespace = Namespc; 3231 } 3232 3233 PushOnScopeChains(Namespc, DeclRegionScope); 3234 } else { 3235 // Anonymous namespaces. 3236 assert(Namespc->isAnonymousNamespace()); 3237 3238 // Link the anonymous namespace into its parent. 3239 NamespaceDecl *PrevDecl; 3240 DeclContext *Parent = CurContext->getLookupContext(); 3241 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3242 PrevDecl = TU->getAnonymousNamespace(); 3243 TU->setAnonymousNamespace(Namespc); 3244 } else { 3245 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3246 PrevDecl = ND->getAnonymousNamespace(); 3247 ND->setAnonymousNamespace(Namespc); 3248 } 3249 3250 // Link the anonymous namespace with its previous declaration. 3251 if (PrevDecl) { 3252 assert(PrevDecl->isAnonymousNamespace()); 3253 assert(!PrevDecl->getNextNamespace()); 3254 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3255 PrevDecl->setNextNamespace(Namespc); 3256 } 3257 3258 CurContext->addDecl(Namespc); 3259 3260 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3261 // behaves as if it were replaced by 3262 // namespace unique { /* empty body */ } 3263 // using namespace unique; 3264 // namespace unique { namespace-body } 3265 // where all occurrences of 'unique' in a translation unit are 3266 // replaced by the same identifier and this identifier differs 3267 // from all other identifiers in the entire program. 3268 3269 // We just create the namespace with an empty name and then add an 3270 // implicit using declaration, just like the standard suggests. 3271 // 3272 // CodeGen enforces the "universally unique" aspect by giving all 3273 // declarations semantically contained within an anonymous 3274 // namespace internal linkage. 3275 3276 if (!PrevDecl) { 3277 UsingDirectiveDecl* UD 3278 = UsingDirectiveDecl::Create(Context, CurContext, 3279 /* 'using' */ LBrace, 3280 /* 'namespace' */ SourceLocation(), 3281 /* qualifier */ SourceRange(), 3282 /* NNS */ NULL, 3283 /* identifier */ SourceLocation(), 3284 Namespc, 3285 /* Ancestor */ CurContext); 3286 UD->setImplicit(); 3287 CurContext->addDecl(UD); 3288 } 3289 } 3290 3291 // Although we could have an invalid decl (i.e. the namespace name is a 3292 // redefinition), push it as current DeclContext and try to continue parsing. 3293 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3294 // for the namespace has the declarations that showed up in that particular 3295 // namespace definition. 3296 PushDeclContext(NamespcScope, Namespc); 3297 return DeclPtrTy::make(Namespc); 3298} 3299 3300/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3301/// is a namespace alias, returns the namespace it points to. 3302static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3303 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3304 return AD->getNamespace(); 3305 return dyn_cast_or_null<NamespaceDecl>(D); 3306} 3307 3308/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3309/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3310void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3311 Decl *Dcl = D.getAs<Decl>(); 3312 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3313 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3314 Namespc->setRBracLoc(RBrace); 3315 PopDeclContext(); 3316 if (Namespc->hasAttr<VisibilityAttr>()) 3317 PopPragmaVisibility(); 3318} 3319 3320/// \brief Retrieve the special "std" namespace, which may require us to 3321/// implicitly define the namespace. 3322NamespaceDecl *Sema::getOrCreateStdNamespace() { 3323 if (!StdNamespace) { 3324 // The "std" namespace has not yet been defined, so build one implicitly. 3325 StdNamespace = NamespaceDecl::Create(Context, 3326 Context.getTranslationUnitDecl(), 3327 SourceLocation(), 3328 &PP.getIdentifierTable().get("std")); 3329 getStdNamespace()->setImplicit(true); 3330 } 3331 3332 return getStdNamespace(); 3333} 3334 3335Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3336 SourceLocation UsingLoc, 3337 SourceLocation NamespcLoc, 3338 CXXScopeSpec &SS, 3339 SourceLocation IdentLoc, 3340 IdentifierInfo *NamespcName, 3341 AttributeList *AttrList) { 3342 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3343 assert(NamespcName && "Invalid NamespcName."); 3344 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3345 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3346 3347 UsingDirectiveDecl *UDir = 0; 3348 NestedNameSpecifier *Qualifier = 0; 3349 if (SS.isSet()) 3350 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3351 3352 // Lookup namespace name. 3353 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3354 LookupParsedName(R, S, &SS); 3355 if (R.isAmbiguous()) 3356 return DeclPtrTy(); 3357 3358 if (R.empty()) { 3359 // Allow "using namespace std;" or "using namespace ::std;" even if 3360 // "std" hasn't been defined yet, for GCC compatibility. 3361 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3362 NamespcName->isStr("std")) { 3363 Diag(IdentLoc, diag::ext_using_undefined_std); 3364 R.addDecl(getOrCreateStdNamespace()); 3365 R.resolveKind(); 3366 } 3367 // Otherwise, attempt typo correction. 3368 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3369 CTC_NoKeywords, 0)) { 3370 if (R.getAsSingle<NamespaceDecl>() || 3371 R.getAsSingle<NamespaceAliasDecl>()) { 3372 if (DeclContext *DC = computeDeclContext(SS, false)) 3373 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3374 << NamespcName << DC << Corrected << SS.getRange() 3375 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3376 else 3377 Diag(IdentLoc, diag::err_using_directive_suggest) 3378 << NamespcName << Corrected 3379 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3380 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3381 << Corrected; 3382 3383 NamespcName = Corrected.getAsIdentifierInfo(); 3384 } else { 3385 R.clear(); 3386 R.setLookupName(NamespcName); 3387 } 3388 } 3389 } 3390 3391 if (!R.empty()) { 3392 NamedDecl *Named = R.getFoundDecl(); 3393 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3394 && "expected namespace decl"); 3395 // C++ [namespace.udir]p1: 3396 // A using-directive specifies that the names in the nominated 3397 // namespace can be used in the scope in which the 3398 // using-directive appears after the using-directive. During 3399 // unqualified name lookup (3.4.1), the names appear as if they 3400 // were declared in the nearest enclosing namespace which 3401 // contains both the using-directive and the nominated 3402 // namespace. [Note: in this context, "contains" means "contains 3403 // directly or indirectly". ] 3404 3405 // Find enclosing context containing both using-directive and 3406 // nominated namespace. 3407 NamespaceDecl *NS = getNamespaceDecl(Named); 3408 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3409 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3410 CommonAncestor = CommonAncestor->getParent(); 3411 3412 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3413 SS.getRange(), 3414 (NestedNameSpecifier *)SS.getScopeRep(), 3415 IdentLoc, Named, CommonAncestor); 3416 PushUsingDirective(S, UDir); 3417 } else { 3418 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3419 } 3420 3421 // FIXME: We ignore attributes for now. 3422 delete AttrList; 3423 return DeclPtrTy::make(UDir); 3424} 3425 3426void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3427 // If scope has associated entity, then using directive is at namespace 3428 // or translation unit scope. We add UsingDirectiveDecls, into 3429 // it's lookup structure. 3430 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3431 Ctx->addDecl(UDir); 3432 else 3433 // Otherwise it is block-sope. using-directives will affect lookup 3434 // only to the end of scope. 3435 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3436} 3437 3438 3439Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3440 AccessSpecifier AS, 3441 bool HasUsingKeyword, 3442 SourceLocation UsingLoc, 3443 CXXScopeSpec &SS, 3444 UnqualifiedId &Name, 3445 AttributeList *AttrList, 3446 bool IsTypeName, 3447 SourceLocation TypenameLoc) { 3448 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3449 3450 switch (Name.getKind()) { 3451 case UnqualifiedId::IK_Identifier: 3452 case UnqualifiedId::IK_OperatorFunctionId: 3453 case UnqualifiedId::IK_LiteralOperatorId: 3454 case UnqualifiedId::IK_ConversionFunctionId: 3455 break; 3456 3457 case UnqualifiedId::IK_ConstructorName: 3458 case UnqualifiedId::IK_ConstructorTemplateId: 3459 // C++0x inherited constructors. 3460 if (getLangOptions().CPlusPlus0x) break; 3461 3462 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3463 << SS.getRange(); 3464 return DeclPtrTy(); 3465 3466 case UnqualifiedId::IK_DestructorName: 3467 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3468 << SS.getRange(); 3469 return DeclPtrTy(); 3470 3471 case UnqualifiedId::IK_TemplateId: 3472 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3473 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3474 return DeclPtrTy(); 3475 } 3476 3477 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3478 if (!TargetName) 3479 return DeclPtrTy(); 3480 3481 // Warn about using declarations. 3482 // TODO: store that the declaration was written without 'using' and 3483 // talk about access decls instead of using decls in the 3484 // diagnostics. 3485 if (!HasUsingKeyword) { 3486 UsingLoc = Name.getSourceRange().getBegin(); 3487 3488 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3489 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3490 } 3491 3492 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3493 Name.getSourceRange().getBegin(), 3494 TargetName, AttrList, 3495 /* IsInstantiation */ false, 3496 IsTypeName, TypenameLoc); 3497 if (UD) 3498 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3499 3500 return DeclPtrTy::make(UD); 3501} 3502 3503/// \brief Determine whether a using declaration considers the given 3504/// declarations as "equivalent", e.g., if they are redeclarations of 3505/// the same entity or are both typedefs of the same type. 3506static bool 3507IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3508 bool &SuppressRedeclaration) { 3509 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3510 SuppressRedeclaration = false; 3511 return true; 3512 } 3513 3514 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3515 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3516 SuppressRedeclaration = true; 3517 return Context.hasSameType(TD1->getUnderlyingType(), 3518 TD2->getUnderlyingType()); 3519 } 3520 3521 return false; 3522} 3523 3524 3525/// Determines whether to create a using shadow decl for a particular 3526/// decl, given the set of decls existing prior to this using lookup. 3527bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3528 const LookupResult &Previous) { 3529 // Diagnose finding a decl which is not from a base class of the 3530 // current class. We do this now because there are cases where this 3531 // function will silently decide not to build a shadow decl, which 3532 // will pre-empt further diagnostics. 3533 // 3534 // We don't need to do this in C++0x because we do the check once on 3535 // the qualifier. 3536 // 3537 // FIXME: diagnose the following if we care enough: 3538 // struct A { int foo; }; 3539 // struct B : A { using A::foo; }; 3540 // template <class T> struct C : A {}; 3541 // template <class T> struct D : C<T> { using B::foo; } // <--- 3542 // This is invalid (during instantiation) in C++03 because B::foo 3543 // resolves to the using decl in B, which is not a base class of D<T>. 3544 // We can't diagnose it immediately because C<T> is an unknown 3545 // specialization. The UsingShadowDecl in D<T> then points directly 3546 // to A::foo, which will look well-formed when we instantiate. 3547 // The right solution is to not collapse the shadow-decl chain. 3548 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3549 DeclContext *OrigDC = Orig->getDeclContext(); 3550 3551 // Handle enums and anonymous structs. 3552 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3553 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3554 while (OrigRec->isAnonymousStructOrUnion()) 3555 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3556 3557 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3558 if (OrigDC == CurContext) { 3559 Diag(Using->getLocation(), 3560 diag::err_using_decl_nested_name_specifier_is_current_class) 3561 << Using->getNestedNameRange(); 3562 Diag(Orig->getLocation(), diag::note_using_decl_target); 3563 return true; 3564 } 3565 3566 Diag(Using->getNestedNameRange().getBegin(), 3567 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3568 << Using->getTargetNestedNameDecl() 3569 << cast<CXXRecordDecl>(CurContext) 3570 << Using->getNestedNameRange(); 3571 Diag(Orig->getLocation(), diag::note_using_decl_target); 3572 return true; 3573 } 3574 } 3575 3576 if (Previous.empty()) return false; 3577 3578 NamedDecl *Target = Orig; 3579 if (isa<UsingShadowDecl>(Target)) 3580 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3581 3582 // If the target happens to be one of the previous declarations, we 3583 // don't have a conflict. 3584 // 3585 // FIXME: but we might be increasing its access, in which case we 3586 // should redeclare it. 3587 NamedDecl *NonTag = 0, *Tag = 0; 3588 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3589 I != E; ++I) { 3590 NamedDecl *D = (*I)->getUnderlyingDecl(); 3591 bool Result; 3592 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3593 return Result; 3594 3595 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3596 } 3597 3598 if (Target->isFunctionOrFunctionTemplate()) { 3599 FunctionDecl *FD; 3600 if (isa<FunctionTemplateDecl>(Target)) 3601 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3602 else 3603 FD = cast<FunctionDecl>(Target); 3604 3605 NamedDecl *OldDecl = 0; 3606 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3607 case Ovl_Overload: 3608 return false; 3609 3610 case Ovl_NonFunction: 3611 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3612 break; 3613 3614 // We found a decl with the exact signature. 3615 case Ovl_Match: 3616 // If we're in a record, we want to hide the target, so we 3617 // return true (without a diagnostic) to tell the caller not to 3618 // build a shadow decl. 3619 if (CurContext->isRecord()) 3620 return true; 3621 3622 // If we're not in a record, this is an error. 3623 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3624 break; 3625 } 3626 3627 Diag(Target->getLocation(), diag::note_using_decl_target); 3628 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3629 return true; 3630 } 3631 3632 // Target is not a function. 3633 3634 if (isa<TagDecl>(Target)) { 3635 // No conflict between a tag and a non-tag. 3636 if (!Tag) return false; 3637 3638 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3639 Diag(Target->getLocation(), diag::note_using_decl_target); 3640 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3641 return true; 3642 } 3643 3644 // No conflict between a tag and a non-tag. 3645 if (!NonTag) return false; 3646 3647 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3648 Diag(Target->getLocation(), diag::note_using_decl_target); 3649 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3650 return true; 3651} 3652 3653/// Builds a shadow declaration corresponding to a 'using' declaration. 3654UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3655 UsingDecl *UD, 3656 NamedDecl *Orig) { 3657 3658 // If we resolved to another shadow declaration, just coalesce them. 3659 NamedDecl *Target = Orig; 3660 if (isa<UsingShadowDecl>(Target)) { 3661 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3662 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3663 } 3664 3665 UsingShadowDecl *Shadow 3666 = UsingShadowDecl::Create(Context, CurContext, 3667 UD->getLocation(), UD, Target); 3668 UD->addShadowDecl(Shadow); 3669 3670 if (S) 3671 PushOnScopeChains(Shadow, S); 3672 else 3673 CurContext->addDecl(Shadow); 3674 Shadow->setAccess(UD->getAccess()); 3675 3676 // Register it as a conversion if appropriate. 3677 if (Shadow->getDeclName().getNameKind() 3678 == DeclarationName::CXXConversionFunctionName) 3679 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3680 3681 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3682 Shadow->setInvalidDecl(); 3683 3684 return Shadow; 3685} 3686 3687/// Hides a using shadow declaration. This is required by the current 3688/// using-decl implementation when a resolvable using declaration in a 3689/// class is followed by a declaration which would hide or override 3690/// one or more of the using decl's targets; for example: 3691/// 3692/// struct Base { void foo(int); }; 3693/// struct Derived : Base { 3694/// using Base::foo; 3695/// void foo(int); 3696/// }; 3697/// 3698/// The governing language is C++03 [namespace.udecl]p12: 3699/// 3700/// When a using-declaration brings names from a base class into a 3701/// derived class scope, member functions in the derived class 3702/// override and/or hide member functions with the same name and 3703/// parameter types in a base class (rather than conflicting). 3704/// 3705/// There are two ways to implement this: 3706/// (1) optimistically create shadow decls when they're not hidden 3707/// by existing declarations, or 3708/// (2) don't create any shadow decls (or at least don't make them 3709/// visible) until we've fully parsed/instantiated the class. 3710/// The problem with (1) is that we might have to retroactively remove 3711/// a shadow decl, which requires several O(n) operations because the 3712/// decl structures are (very reasonably) not designed for removal. 3713/// (2) avoids this but is very fiddly and phase-dependent. 3714void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3715 if (Shadow->getDeclName().getNameKind() == 3716 DeclarationName::CXXConversionFunctionName) 3717 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3718 3719 // Remove it from the DeclContext... 3720 Shadow->getDeclContext()->removeDecl(Shadow); 3721 3722 // ...and the scope, if applicable... 3723 if (S) { 3724 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3725 IdResolver.RemoveDecl(Shadow); 3726 } 3727 3728 // ...and the using decl. 3729 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3730 3731 // TODO: complain somehow if Shadow was used. It shouldn't 3732 // be possible for this to happen, because...? 3733} 3734 3735/// Builds a using declaration. 3736/// 3737/// \param IsInstantiation - Whether this call arises from an 3738/// instantiation of an unresolved using declaration. We treat 3739/// the lookup differently for these declarations. 3740NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3741 SourceLocation UsingLoc, 3742 CXXScopeSpec &SS, 3743 SourceLocation IdentLoc, 3744 DeclarationName Name, 3745 AttributeList *AttrList, 3746 bool IsInstantiation, 3747 bool IsTypeName, 3748 SourceLocation TypenameLoc) { 3749 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3750 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3751 3752 // FIXME: We ignore attributes for now. 3753 delete AttrList; 3754 3755 if (SS.isEmpty()) { 3756 Diag(IdentLoc, diag::err_using_requires_qualname); 3757 return 0; 3758 } 3759 3760 // Do the redeclaration lookup in the current scope. 3761 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3762 ForRedeclaration); 3763 Previous.setHideTags(false); 3764 if (S) { 3765 LookupName(Previous, S); 3766 3767 // It is really dumb that we have to do this. 3768 LookupResult::Filter F = Previous.makeFilter(); 3769 while (F.hasNext()) { 3770 NamedDecl *D = F.next(); 3771 if (!isDeclInScope(D, CurContext, S)) 3772 F.erase(); 3773 } 3774 F.done(); 3775 } else { 3776 assert(IsInstantiation && "no scope in non-instantiation"); 3777 assert(CurContext->isRecord() && "scope not record in instantiation"); 3778 LookupQualifiedName(Previous, CurContext); 3779 } 3780 3781 NestedNameSpecifier *NNS = 3782 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3783 3784 // Check for invalid redeclarations. 3785 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3786 return 0; 3787 3788 // Check for bad qualifiers. 3789 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3790 return 0; 3791 3792 DeclContext *LookupContext = computeDeclContext(SS); 3793 NamedDecl *D; 3794 if (!LookupContext) { 3795 if (IsTypeName) { 3796 // FIXME: not all declaration name kinds are legal here 3797 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3798 UsingLoc, TypenameLoc, 3799 SS.getRange(), NNS, 3800 IdentLoc, Name); 3801 } else { 3802 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3803 UsingLoc, SS.getRange(), NNS, 3804 IdentLoc, Name); 3805 } 3806 } else { 3807 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3808 SS.getRange(), UsingLoc, NNS, Name, 3809 IsTypeName); 3810 } 3811 D->setAccess(AS); 3812 CurContext->addDecl(D); 3813 3814 if (!LookupContext) return D; 3815 UsingDecl *UD = cast<UsingDecl>(D); 3816 3817 if (RequireCompleteDeclContext(SS, LookupContext)) { 3818 UD->setInvalidDecl(); 3819 return UD; 3820 } 3821 3822 // Look up the target name. 3823 3824 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3825 3826 // Unlike most lookups, we don't always want to hide tag 3827 // declarations: tag names are visible through the using declaration 3828 // even if hidden by ordinary names, *except* in a dependent context 3829 // where it's important for the sanity of two-phase lookup. 3830 if (!IsInstantiation) 3831 R.setHideTags(false); 3832 3833 LookupQualifiedName(R, LookupContext); 3834 3835 if (R.empty()) { 3836 Diag(IdentLoc, diag::err_no_member) 3837 << Name << LookupContext << SS.getRange(); 3838 UD->setInvalidDecl(); 3839 return UD; 3840 } 3841 3842 if (R.isAmbiguous()) { 3843 UD->setInvalidDecl(); 3844 return UD; 3845 } 3846 3847 if (IsTypeName) { 3848 // If we asked for a typename and got a non-type decl, error out. 3849 if (!R.getAsSingle<TypeDecl>()) { 3850 Diag(IdentLoc, diag::err_using_typename_non_type); 3851 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3852 Diag((*I)->getUnderlyingDecl()->getLocation(), 3853 diag::note_using_decl_target); 3854 UD->setInvalidDecl(); 3855 return UD; 3856 } 3857 } else { 3858 // If we asked for a non-typename and we got a type, error out, 3859 // but only if this is an instantiation of an unresolved using 3860 // decl. Otherwise just silently find the type name. 3861 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3862 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3863 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3864 UD->setInvalidDecl(); 3865 return UD; 3866 } 3867 } 3868 3869 // C++0x N2914 [namespace.udecl]p6: 3870 // A using-declaration shall not name a namespace. 3871 if (R.getAsSingle<NamespaceDecl>()) { 3872 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3873 << SS.getRange(); 3874 UD->setInvalidDecl(); 3875 return UD; 3876 } 3877 3878 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3879 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3880 BuildUsingShadowDecl(S, UD, *I); 3881 } 3882 3883 return UD; 3884} 3885 3886/// Checks that the given using declaration is not an invalid 3887/// redeclaration. Note that this is checking only for the using decl 3888/// itself, not for any ill-formedness among the UsingShadowDecls. 3889bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3890 bool isTypeName, 3891 const CXXScopeSpec &SS, 3892 SourceLocation NameLoc, 3893 const LookupResult &Prev) { 3894 // C++03 [namespace.udecl]p8: 3895 // C++0x [namespace.udecl]p10: 3896 // A using-declaration is a declaration and can therefore be used 3897 // repeatedly where (and only where) multiple declarations are 3898 // allowed. 3899 // 3900 // That's in non-member contexts. 3901 if (!CurContext->getLookupContext()->isRecord()) 3902 return false; 3903 3904 NestedNameSpecifier *Qual 3905 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3906 3907 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3908 NamedDecl *D = *I; 3909 3910 bool DTypename; 3911 NestedNameSpecifier *DQual; 3912 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3913 DTypename = UD->isTypeName(); 3914 DQual = UD->getTargetNestedNameDecl(); 3915 } else if (UnresolvedUsingValueDecl *UD 3916 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3917 DTypename = false; 3918 DQual = UD->getTargetNestedNameSpecifier(); 3919 } else if (UnresolvedUsingTypenameDecl *UD 3920 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3921 DTypename = true; 3922 DQual = UD->getTargetNestedNameSpecifier(); 3923 } else continue; 3924 3925 // using decls differ if one says 'typename' and the other doesn't. 3926 // FIXME: non-dependent using decls? 3927 if (isTypeName != DTypename) continue; 3928 3929 // using decls differ if they name different scopes (but note that 3930 // template instantiation can cause this check to trigger when it 3931 // didn't before instantiation). 3932 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3933 Context.getCanonicalNestedNameSpecifier(DQual)) 3934 continue; 3935 3936 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3937 Diag(D->getLocation(), diag::note_using_decl) << 1; 3938 return true; 3939 } 3940 3941 return false; 3942} 3943 3944 3945/// Checks that the given nested-name qualifier used in a using decl 3946/// in the current context is appropriately related to the current 3947/// scope. If an error is found, diagnoses it and returns true. 3948bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3949 const CXXScopeSpec &SS, 3950 SourceLocation NameLoc) { 3951 DeclContext *NamedContext = computeDeclContext(SS); 3952 3953 if (!CurContext->isRecord()) { 3954 // C++03 [namespace.udecl]p3: 3955 // C++0x [namespace.udecl]p8: 3956 // A using-declaration for a class member shall be a member-declaration. 3957 3958 // If we weren't able to compute a valid scope, it must be a 3959 // dependent class scope. 3960 if (!NamedContext || NamedContext->isRecord()) { 3961 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3962 << SS.getRange(); 3963 return true; 3964 } 3965 3966 // Otherwise, everything is known to be fine. 3967 return false; 3968 } 3969 3970 // The current scope is a record. 3971 3972 // If the named context is dependent, we can't decide much. 3973 if (!NamedContext) { 3974 // FIXME: in C++0x, we can diagnose if we can prove that the 3975 // nested-name-specifier does not refer to a base class, which is 3976 // still possible in some cases. 3977 3978 // Otherwise we have to conservatively report that things might be 3979 // okay. 3980 return false; 3981 } 3982 3983 if (!NamedContext->isRecord()) { 3984 // Ideally this would point at the last name in the specifier, 3985 // but we don't have that level of source info. 3986 Diag(SS.getRange().getBegin(), 3987 diag::err_using_decl_nested_name_specifier_is_not_class) 3988 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3989 return true; 3990 } 3991 3992 if (getLangOptions().CPlusPlus0x) { 3993 // C++0x [namespace.udecl]p3: 3994 // In a using-declaration used as a member-declaration, the 3995 // nested-name-specifier shall name a base class of the class 3996 // being defined. 3997 3998 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3999 cast<CXXRecordDecl>(NamedContext))) { 4000 if (CurContext == NamedContext) { 4001 Diag(NameLoc, 4002 diag::err_using_decl_nested_name_specifier_is_current_class) 4003 << SS.getRange(); 4004 return true; 4005 } 4006 4007 Diag(SS.getRange().getBegin(), 4008 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4009 << (NestedNameSpecifier*) SS.getScopeRep() 4010 << cast<CXXRecordDecl>(CurContext) 4011 << SS.getRange(); 4012 return true; 4013 } 4014 4015 return false; 4016 } 4017 4018 // C++03 [namespace.udecl]p4: 4019 // A using-declaration used as a member-declaration shall refer 4020 // to a member of a base class of the class being defined [etc.]. 4021 4022 // Salient point: SS doesn't have to name a base class as long as 4023 // lookup only finds members from base classes. Therefore we can 4024 // diagnose here only if we can prove that that can't happen, 4025 // i.e. if the class hierarchies provably don't intersect. 4026 4027 // TODO: it would be nice if "definitely valid" results were cached 4028 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4029 // need to be repeated. 4030 4031 struct UserData { 4032 llvm::DenseSet<const CXXRecordDecl*> Bases; 4033 4034 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4035 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4036 Data->Bases.insert(Base); 4037 return true; 4038 } 4039 4040 bool hasDependentBases(const CXXRecordDecl *Class) { 4041 return !Class->forallBases(collect, this); 4042 } 4043 4044 /// Returns true if the base is dependent or is one of the 4045 /// accumulated base classes. 4046 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4047 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4048 return !Data->Bases.count(Base); 4049 } 4050 4051 bool mightShareBases(const CXXRecordDecl *Class) { 4052 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4053 } 4054 }; 4055 4056 UserData Data; 4057 4058 // Returns false if we find a dependent base. 4059 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4060 return false; 4061 4062 // Returns false if the class has a dependent base or if it or one 4063 // of its bases is present in the base set of the current context. 4064 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4065 return false; 4066 4067 Diag(SS.getRange().getBegin(), 4068 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4069 << (NestedNameSpecifier*) SS.getScopeRep() 4070 << cast<CXXRecordDecl>(CurContext) 4071 << SS.getRange(); 4072 4073 return true; 4074} 4075 4076Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4077 SourceLocation NamespaceLoc, 4078 SourceLocation AliasLoc, 4079 IdentifierInfo *Alias, 4080 CXXScopeSpec &SS, 4081 SourceLocation IdentLoc, 4082 IdentifierInfo *Ident) { 4083 4084 // Lookup the namespace name. 4085 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4086 LookupParsedName(R, S, &SS); 4087 4088 // Check if we have a previous declaration with the same name. 4089 NamedDecl *PrevDecl 4090 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4091 ForRedeclaration); 4092 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4093 PrevDecl = 0; 4094 4095 if (PrevDecl) { 4096 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4097 // We already have an alias with the same name that points to the same 4098 // namespace, so don't create a new one. 4099 // FIXME: At some point, we'll want to create the (redundant) 4100 // declaration to maintain better source information. 4101 if (!R.isAmbiguous() && !R.empty() && 4102 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4103 return DeclPtrTy(); 4104 } 4105 4106 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4107 diag::err_redefinition_different_kind; 4108 Diag(AliasLoc, DiagID) << Alias; 4109 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4110 return DeclPtrTy(); 4111 } 4112 4113 if (R.isAmbiguous()) 4114 return DeclPtrTy(); 4115 4116 if (R.empty()) { 4117 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4118 CTC_NoKeywords, 0)) { 4119 if (R.getAsSingle<NamespaceDecl>() || 4120 R.getAsSingle<NamespaceAliasDecl>()) { 4121 if (DeclContext *DC = computeDeclContext(SS, false)) 4122 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4123 << Ident << DC << Corrected << SS.getRange() 4124 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4125 else 4126 Diag(IdentLoc, diag::err_using_directive_suggest) 4127 << Ident << Corrected 4128 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4129 4130 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4131 << Corrected; 4132 4133 Ident = Corrected.getAsIdentifierInfo(); 4134 } else { 4135 R.clear(); 4136 R.setLookupName(Ident); 4137 } 4138 } 4139 4140 if (R.empty()) { 4141 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4142 return DeclPtrTy(); 4143 } 4144 } 4145 4146 NamespaceAliasDecl *AliasDecl = 4147 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4148 Alias, SS.getRange(), 4149 (NestedNameSpecifier *)SS.getScopeRep(), 4150 IdentLoc, R.getFoundDecl()); 4151 4152 PushOnScopeChains(AliasDecl, S); 4153 return DeclPtrTy::make(AliasDecl); 4154} 4155 4156namespace { 4157 /// \brief Scoped object used to handle the state changes required in Sema 4158 /// to implicitly define the body of a C++ member function; 4159 class ImplicitlyDefinedFunctionScope { 4160 Sema &S; 4161 DeclContext *PreviousContext; 4162 4163 public: 4164 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4165 : S(S), PreviousContext(S.CurContext) 4166 { 4167 S.CurContext = Method; 4168 S.PushFunctionScope(); 4169 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4170 } 4171 4172 ~ImplicitlyDefinedFunctionScope() { 4173 S.PopExpressionEvaluationContext(); 4174 S.PopFunctionOrBlockScope(); 4175 S.CurContext = PreviousContext; 4176 } 4177 }; 4178} 4179 4180CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4181 CXXRecordDecl *ClassDecl) { 4182 // C++ [class.ctor]p5: 4183 // A default constructor for a class X is a constructor of class X 4184 // that can be called without an argument. If there is no 4185 // user-declared constructor for class X, a default constructor is 4186 // implicitly declared. An implicitly-declared default constructor 4187 // is an inline public member of its class. 4188 assert(!ClassDecl->hasUserDeclaredConstructor() && 4189 "Should not build implicit default constructor!"); 4190 4191 // C++ [except.spec]p14: 4192 // An implicitly declared special member function (Clause 12) shall have an 4193 // exception-specification. [...] 4194 ImplicitExceptionSpecification ExceptSpec(Context); 4195 4196 // Direct base-class destructors. 4197 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4198 BEnd = ClassDecl->bases_end(); 4199 B != BEnd; ++B) { 4200 if (B->isVirtual()) // Handled below. 4201 continue; 4202 4203 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4204 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4205 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4206 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4207 else if (CXXConstructorDecl *Constructor 4208 = BaseClassDecl->getDefaultConstructor()) 4209 ExceptSpec.CalledDecl(Constructor); 4210 } 4211 } 4212 4213 // Virtual base-class destructors. 4214 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4215 BEnd = ClassDecl->vbases_end(); 4216 B != BEnd; ++B) { 4217 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4218 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4219 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4220 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4221 else if (CXXConstructorDecl *Constructor 4222 = BaseClassDecl->getDefaultConstructor()) 4223 ExceptSpec.CalledDecl(Constructor); 4224 } 4225 } 4226 4227 // Field destructors. 4228 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4229 FEnd = ClassDecl->field_end(); 4230 F != FEnd; ++F) { 4231 if (const RecordType *RecordTy 4232 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4233 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4234 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4235 ExceptSpec.CalledDecl( 4236 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4237 else if (CXXConstructorDecl *Constructor 4238 = FieldClassDecl->getDefaultConstructor()) 4239 ExceptSpec.CalledDecl(Constructor); 4240 } 4241 } 4242 4243 4244 // Create the actual constructor declaration. 4245 CanQualType ClassType 4246 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4247 DeclarationName Name 4248 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4249 CXXConstructorDecl *DefaultCon 4250 = CXXConstructorDecl::Create(Context, ClassDecl, 4251 ClassDecl->getLocation(), Name, 4252 Context.getFunctionType(Context.VoidTy, 4253 0, 0, false, 0, 4254 ExceptSpec.hasExceptionSpecification(), 4255 ExceptSpec.hasAnyExceptionSpecification(), 4256 ExceptSpec.size(), 4257 ExceptSpec.data(), 4258 FunctionType::ExtInfo()), 4259 /*TInfo=*/0, 4260 /*isExplicit=*/false, 4261 /*isInline=*/true, 4262 /*isImplicitlyDeclared=*/true); 4263 DefaultCon->setAccess(AS_public); 4264 DefaultCon->setImplicit(); 4265 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4266 4267 // Note that we have declared this constructor. 4268 ClassDecl->setDeclaredDefaultConstructor(true); 4269 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4270 4271 if (Scope *S = getScopeForContext(ClassDecl)) 4272 PushOnScopeChains(DefaultCon, S, false); 4273 ClassDecl->addDecl(DefaultCon); 4274 4275 return DefaultCon; 4276} 4277 4278void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4279 CXXConstructorDecl *Constructor) { 4280 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4281 !Constructor->isUsed(false)) && 4282 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4283 4284 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4285 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4286 4287 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4288 ErrorTrap Trap(*this); 4289 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4290 Trap.hasErrorOccurred()) { 4291 Diag(CurrentLocation, diag::note_member_synthesized_at) 4292 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4293 Constructor->setInvalidDecl(); 4294 } else { 4295 Constructor->setUsed(); 4296 MarkVTableUsed(CurrentLocation, ClassDecl); 4297 } 4298} 4299 4300CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4301 // C++ [class.dtor]p2: 4302 // If a class has no user-declared destructor, a destructor is 4303 // declared implicitly. An implicitly-declared destructor is an 4304 // inline public member of its class. 4305 4306 // C++ [except.spec]p14: 4307 // An implicitly declared special member function (Clause 12) shall have 4308 // an exception-specification. 4309 ImplicitExceptionSpecification ExceptSpec(Context); 4310 4311 // Direct base-class destructors. 4312 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4313 BEnd = ClassDecl->bases_end(); 4314 B != BEnd; ++B) { 4315 if (B->isVirtual()) // Handled below. 4316 continue; 4317 4318 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4319 ExceptSpec.CalledDecl( 4320 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4321 } 4322 4323 // Virtual base-class destructors. 4324 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4325 BEnd = ClassDecl->vbases_end(); 4326 B != BEnd; ++B) { 4327 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4328 ExceptSpec.CalledDecl( 4329 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4330 } 4331 4332 // Field destructors. 4333 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4334 FEnd = ClassDecl->field_end(); 4335 F != FEnd; ++F) { 4336 if (const RecordType *RecordTy 4337 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4338 ExceptSpec.CalledDecl( 4339 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4340 } 4341 4342 // Create the actual destructor declaration. 4343 QualType Ty = Context.getFunctionType(Context.VoidTy, 4344 0, 0, false, 0, 4345 ExceptSpec.hasExceptionSpecification(), 4346 ExceptSpec.hasAnyExceptionSpecification(), 4347 ExceptSpec.size(), 4348 ExceptSpec.data(), 4349 FunctionType::ExtInfo()); 4350 4351 CanQualType ClassType 4352 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4353 DeclarationName Name 4354 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4355 CXXDestructorDecl *Destructor 4356 = CXXDestructorDecl::Create(Context, ClassDecl, 4357 ClassDecl->getLocation(), Name, Ty, 4358 /*isInline=*/true, 4359 /*isImplicitlyDeclared=*/true); 4360 Destructor->setAccess(AS_public); 4361 Destructor->setImplicit(); 4362 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4363 4364 // Note that we have declared this destructor. 4365 ClassDecl->setDeclaredDestructor(true); 4366 ++ASTContext::NumImplicitDestructorsDeclared; 4367 4368 // Introduce this destructor into its scope. 4369 if (Scope *S = getScopeForContext(ClassDecl)) 4370 PushOnScopeChains(Destructor, S, false); 4371 ClassDecl->addDecl(Destructor); 4372 4373 // This could be uniqued if it ever proves significant. 4374 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4375 4376 AddOverriddenMethods(ClassDecl, Destructor); 4377 4378 return Destructor; 4379} 4380 4381void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4382 CXXDestructorDecl *Destructor) { 4383 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4384 "DefineImplicitDestructor - call it for implicit default dtor"); 4385 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4386 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4387 4388 if (Destructor->isInvalidDecl()) 4389 return; 4390 4391 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4392 4393 ErrorTrap Trap(*this); 4394 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4395 Destructor->getParent()); 4396 4397 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4398 Diag(CurrentLocation, diag::note_member_synthesized_at) 4399 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4400 4401 Destructor->setInvalidDecl(); 4402 return; 4403 } 4404 4405 Destructor->setUsed(); 4406 MarkVTableUsed(CurrentLocation, ClassDecl); 4407} 4408 4409/// \brief Builds a statement that copies the given entity from \p From to 4410/// \c To. 4411/// 4412/// This routine is used to copy the members of a class with an 4413/// implicitly-declared copy assignment operator. When the entities being 4414/// copied are arrays, this routine builds for loops to copy them. 4415/// 4416/// \param S The Sema object used for type-checking. 4417/// 4418/// \param Loc The location where the implicit copy is being generated. 4419/// 4420/// \param T The type of the expressions being copied. Both expressions must 4421/// have this type. 4422/// 4423/// \param To The expression we are copying to. 4424/// 4425/// \param From The expression we are copying from. 4426/// 4427/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4428/// Otherwise, it's a non-static member subobject. 4429/// 4430/// \param Depth Internal parameter recording the depth of the recursion. 4431/// 4432/// \returns A statement or a loop that copies the expressions. 4433static Sema::OwningStmtResult 4434BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4435 Sema::OwningExprResult To, Sema::OwningExprResult From, 4436 bool CopyingBaseSubobject, unsigned Depth = 0) { 4437 typedef Sema::OwningStmtResult OwningStmtResult; 4438 typedef Sema::OwningExprResult OwningExprResult; 4439 4440 // C++0x [class.copy]p30: 4441 // Each subobject is assigned in the manner appropriate to its type: 4442 // 4443 // - if the subobject is of class type, the copy assignment operator 4444 // for the class is used (as if by explicit qualification; that is, 4445 // ignoring any possible virtual overriding functions in more derived 4446 // classes); 4447 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4448 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4449 4450 // Look for operator=. 4451 DeclarationName Name 4452 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4453 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4454 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4455 4456 // Filter out any result that isn't a copy-assignment operator. 4457 LookupResult::Filter F = OpLookup.makeFilter(); 4458 while (F.hasNext()) { 4459 NamedDecl *D = F.next(); 4460 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4461 if (Method->isCopyAssignmentOperator()) 4462 continue; 4463 4464 F.erase(); 4465 } 4466 F.done(); 4467 4468 // Suppress the protected check (C++ [class.protected]) for each of the 4469 // assignment operators we found. This strange dance is required when 4470 // we're assigning via a base classes's copy-assignment operator. To 4471 // ensure that we're getting the right base class subobject (without 4472 // ambiguities), we need to cast "this" to that subobject type; to 4473 // ensure that we don't go through the virtual call mechanism, we need 4474 // to qualify the operator= name with the base class (see below). However, 4475 // this means that if the base class has a protected copy assignment 4476 // operator, the protected member access check will fail. So, we 4477 // rewrite "protected" access to "public" access in this case, since we 4478 // know by construction that we're calling from a derived class. 4479 if (CopyingBaseSubobject) { 4480 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4481 L != LEnd; ++L) { 4482 if (L.getAccess() == AS_protected) 4483 L.setAccess(AS_public); 4484 } 4485 } 4486 4487 // Create the nested-name-specifier that will be used to qualify the 4488 // reference to operator=; this is required to suppress the virtual 4489 // call mechanism. 4490 CXXScopeSpec SS; 4491 SS.setRange(Loc); 4492 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4493 T.getTypePtr())); 4494 4495 // Create the reference to operator=. 4496 OwningExprResult OpEqualRef 4497 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4498 /*FirstQualifierInScope=*/0, OpLookup, 4499 /*TemplateArgs=*/0, 4500 /*SuppressQualifierCheck=*/true); 4501 if (OpEqualRef.isInvalid()) 4502 return S.StmtError(); 4503 4504 // Build the call to the assignment operator. 4505 Expr *FromE = From.takeAs<Expr>(); 4506 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4507 OpEqualRef.takeAs<Expr>(), 4508 Loc, &FromE, 1, 0, Loc); 4509 if (Call.isInvalid()) 4510 return S.StmtError(); 4511 4512 return S.Owned(Call.takeAs<Stmt>()); 4513 } 4514 4515 // - if the subobject is of scalar type, the built-in assignment 4516 // operator is used. 4517 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4518 if (!ArrayTy) { 4519 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4520 BinaryOperator::Assign, 4521 To.takeAs<Expr>(), 4522 From.takeAs<Expr>()); 4523 if (Assignment.isInvalid()) 4524 return S.StmtError(); 4525 4526 return S.Owned(Assignment.takeAs<Stmt>()); 4527 } 4528 4529 // - if the subobject is an array, each element is assigned, in the 4530 // manner appropriate to the element type; 4531 4532 // Construct a loop over the array bounds, e.g., 4533 // 4534 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4535 // 4536 // that will copy each of the array elements. 4537 QualType SizeType = S.Context.getSizeType(); 4538 4539 // Create the iteration variable. 4540 IdentifierInfo *IterationVarName = 0; 4541 { 4542 llvm::SmallString<8> Str; 4543 llvm::raw_svector_ostream OS(Str); 4544 OS << "__i" << Depth; 4545 IterationVarName = &S.Context.Idents.get(OS.str()); 4546 } 4547 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4548 IterationVarName, SizeType, 4549 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4550 VarDecl::None, VarDecl::None); 4551 4552 // Initialize the iteration variable to zero. 4553 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4554 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4555 4556 // Create a reference to the iteration variable; we'll use this several 4557 // times throughout. 4558 Expr *IterationVarRef 4559 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4560 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4561 4562 // Create the DeclStmt that holds the iteration variable. 4563 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4564 4565 // Create the comparison against the array bound. 4566 llvm::APInt Upper = ArrayTy->getSize(); 4567 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4568 OwningExprResult Comparison 4569 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4570 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4571 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4572 4573 // Create the pre-increment of the iteration variable. 4574 OwningExprResult Increment 4575 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4576 UnaryOperator::PreInc, 4577 SizeType, Loc)); 4578 4579 // Subscript the "from" and "to" expressions with the iteration variable. 4580 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4581 S.Owned(IterationVarRef->Retain()), 4582 Loc); 4583 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4584 S.Owned(IterationVarRef->Retain()), 4585 Loc); 4586 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4587 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4588 4589 // Build the copy for an individual element of the array. 4590 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4591 ArrayTy->getElementType(), 4592 move(To), move(From), 4593 CopyingBaseSubobject, Depth+1); 4594 if (Copy.isInvalid()) 4595 return S.StmtError(); 4596 4597 // Construct the loop that copies all elements of this array. 4598 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4599 S.MakeFullExpr(Comparison), 4600 Sema::DeclPtrTy(), 4601 S.MakeFullExpr(Increment), 4602 Loc, move(Copy)); 4603} 4604 4605/// \brief Determine whether the given class has a copy assignment operator 4606/// that accepts a const-qualified argument. 4607static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4608 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4609 4610 if (!Class->hasDeclaredCopyAssignment()) 4611 S.DeclareImplicitCopyAssignment(Class); 4612 4613 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4614 DeclarationName OpName 4615 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4616 4617 DeclContext::lookup_const_iterator Op, OpEnd; 4618 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4619 // C++ [class.copy]p9: 4620 // A user-declared copy assignment operator is a non-static non-template 4621 // member function of class X with exactly one parameter of type X, X&, 4622 // const X&, volatile X& or const volatile X&. 4623 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4624 if (!Method) 4625 continue; 4626 4627 if (Method->isStatic()) 4628 continue; 4629 if (Method->getPrimaryTemplate()) 4630 continue; 4631 const FunctionProtoType *FnType = 4632 Method->getType()->getAs<FunctionProtoType>(); 4633 assert(FnType && "Overloaded operator has no prototype."); 4634 // Don't assert on this; an invalid decl might have been left in the AST. 4635 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4636 continue; 4637 bool AcceptsConst = true; 4638 QualType ArgType = FnType->getArgType(0); 4639 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4640 ArgType = Ref->getPointeeType(); 4641 // Is it a non-const lvalue reference? 4642 if (!ArgType.isConstQualified()) 4643 AcceptsConst = false; 4644 } 4645 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4646 continue; 4647 4648 // We have a single argument of type cv X or cv X&, i.e. we've found the 4649 // copy assignment operator. Return whether it accepts const arguments. 4650 return AcceptsConst; 4651 } 4652 assert(Class->isInvalidDecl() && 4653 "No copy assignment operator declared in valid code."); 4654 return false; 4655} 4656 4657CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4658 // Note: The following rules are largely analoguous to the copy 4659 // constructor rules. Note that virtual bases are not taken into account 4660 // for determining the argument type of the operator. Note also that 4661 // operators taking an object instead of a reference are allowed. 4662 4663 4664 // C++ [class.copy]p10: 4665 // If the class definition does not explicitly declare a copy 4666 // assignment operator, one is declared implicitly. 4667 // The implicitly-defined copy assignment operator for a class X 4668 // will have the form 4669 // 4670 // X& X::operator=(const X&) 4671 // 4672 // if 4673 bool HasConstCopyAssignment = true; 4674 4675 // -- each direct base class B of X has a copy assignment operator 4676 // whose parameter is of type const B&, const volatile B& or B, 4677 // and 4678 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4679 BaseEnd = ClassDecl->bases_end(); 4680 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4681 assert(!Base->getType()->isDependentType() && 4682 "Cannot generate implicit members for class with dependent bases."); 4683 const CXXRecordDecl *BaseClassDecl 4684 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4685 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4686 } 4687 4688 // -- for all the nonstatic data members of X that are of a class 4689 // type M (or array thereof), each such class type has a copy 4690 // assignment operator whose parameter is of type const M&, 4691 // const volatile M& or M. 4692 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4693 FieldEnd = ClassDecl->field_end(); 4694 HasConstCopyAssignment && Field != FieldEnd; 4695 ++Field) { 4696 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4697 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4698 const CXXRecordDecl *FieldClassDecl 4699 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4700 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4701 } 4702 } 4703 4704 // Otherwise, the implicitly declared copy assignment operator will 4705 // have the form 4706 // 4707 // X& X::operator=(X&) 4708 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4709 QualType RetType = Context.getLValueReferenceType(ArgType); 4710 if (HasConstCopyAssignment) 4711 ArgType = ArgType.withConst(); 4712 ArgType = Context.getLValueReferenceType(ArgType); 4713 4714 // C++ [except.spec]p14: 4715 // An implicitly declared special member function (Clause 12) shall have an 4716 // exception-specification. [...] 4717 ImplicitExceptionSpecification ExceptSpec(Context); 4718 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4719 BaseEnd = ClassDecl->bases_end(); 4720 Base != BaseEnd; ++Base) { 4721 CXXRecordDecl *BaseClassDecl 4722 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4723 4724 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4725 DeclareImplicitCopyAssignment(BaseClassDecl); 4726 4727 if (CXXMethodDecl *CopyAssign 4728 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4729 ExceptSpec.CalledDecl(CopyAssign); 4730 } 4731 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4732 FieldEnd = ClassDecl->field_end(); 4733 Field != FieldEnd; 4734 ++Field) { 4735 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4736 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4737 CXXRecordDecl *FieldClassDecl 4738 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4739 4740 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4741 DeclareImplicitCopyAssignment(FieldClassDecl); 4742 4743 if (CXXMethodDecl *CopyAssign 4744 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4745 ExceptSpec.CalledDecl(CopyAssign); 4746 } 4747 } 4748 4749 // An implicitly-declared copy assignment operator is an inline public 4750 // member of its class. 4751 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4752 CXXMethodDecl *CopyAssignment 4753 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4754 Context.getFunctionType(RetType, &ArgType, 1, 4755 false, 0, 4756 ExceptSpec.hasExceptionSpecification(), 4757 ExceptSpec.hasAnyExceptionSpecification(), 4758 ExceptSpec.size(), 4759 ExceptSpec.data(), 4760 FunctionType::ExtInfo()), 4761 /*TInfo=*/0, /*isStatic=*/false, 4762 /*StorageClassAsWritten=*/FunctionDecl::None, 4763 /*isInline=*/true); 4764 CopyAssignment->setAccess(AS_public); 4765 CopyAssignment->setImplicit(); 4766 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4767 CopyAssignment->setCopyAssignment(true); 4768 4769 // Add the parameter to the operator. 4770 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4771 ClassDecl->getLocation(), 4772 /*Id=*/0, 4773 ArgType, /*TInfo=*/0, 4774 VarDecl::None, 4775 VarDecl::None, 0); 4776 CopyAssignment->setParams(&FromParam, 1); 4777 4778 // Note that we have added this copy-assignment operator. 4779 ClassDecl->setDeclaredCopyAssignment(true); 4780 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4781 4782 if (Scope *S = getScopeForContext(ClassDecl)) 4783 PushOnScopeChains(CopyAssignment, S, false); 4784 ClassDecl->addDecl(CopyAssignment); 4785 4786 AddOverriddenMethods(ClassDecl, CopyAssignment); 4787 return CopyAssignment; 4788} 4789 4790void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4791 CXXMethodDecl *CopyAssignOperator) { 4792 assert((CopyAssignOperator->isImplicit() && 4793 CopyAssignOperator->isOverloadedOperator() && 4794 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4795 !CopyAssignOperator->isUsed(false)) && 4796 "DefineImplicitCopyAssignment called for wrong function"); 4797 4798 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4799 4800 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4801 CopyAssignOperator->setInvalidDecl(); 4802 return; 4803 } 4804 4805 CopyAssignOperator->setUsed(); 4806 4807 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4808 ErrorTrap Trap(*this); 4809 4810 // C++0x [class.copy]p30: 4811 // The implicitly-defined or explicitly-defaulted copy assignment operator 4812 // for a non-union class X performs memberwise copy assignment of its 4813 // subobjects. The direct base classes of X are assigned first, in the 4814 // order of their declaration in the base-specifier-list, and then the 4815 // immediate non-static data members of X are assigned, in the order in 4816 // which they were declared in the class definition. 4817 4818 // The statements that form the synthesized function body. 4819 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4820 4821 // The parameter for the "other" object, which we are copying from. 4822 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4823 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4824 QualType OtherRefType = Other->getType(); 4825 if (const LValueReferenceType *OtherRef 4826 = OtherRefType->getAs<LValueReferenceType>()) { 4827 OtherRefType = OtherRef->getPointeeType(); 4828 OtherQuals = OtherRefType.getQualifiers(); 4829 } 4830 4831 // Our location for everything implicitly-generated. 4832 SourceLocation Loc = CopyAssignOperator->getLocation(); 4833 4834 // Construct a reference to the "other" object. We'll be using this 4835 // throughout the generated ASTs. 4836 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4837 assert(OtherRef && "Reference to parameter cannot fail!"); 4838 4839 // Construct the "this" pointer. We'll be using this throughout the generated 4840 // ASTs. 4841 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4842 assert(This && "Reference to this cannot fail!"); 4843 4844 // Assign base classes. 4845 bool Invalid = false; 4846 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4847 E = ClassDecl->bases_end(); Base != E; ++Base) { 4848 // Form the assignment: 4849 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4850 QualType BaseType = Base->getType().getUnqualifiedType(); 4851 CXXRecordDecl *BaseClassDecl = 0; 4852 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4853 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4854 else { 4855 Invalid = true; 4856 continue; 4857 } 4858 4859 // Construct the "from" expression, which is an implicit cast to the 4860 // appropriately-qualified base type. 4861 Expr *From = OtherRef->Retain(); 4862 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4863 CastExpr::CK_UncheckedDerivedToBase, 4864 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4865 4866 // Dereference "this". 4867 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4868 Owned(This->Retain())); 4869 4870 // Implicitly cast "this" to the appropriately-qualified base type. 4871 Expr *ToE = To.takeAs<Expr>(); 4872 ImpCastExprToType(ToE, 4873 Context.getCVRQualifiedType(BaseType, 4874 CopyAssignOperator->getTypeQualifiers()), 4875 CastExpr::CK_UncheckedDerivedToBase, 4876 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4877 To = Owned(ToE); 4878 4879 // Build the copy. 4880 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4881 move(To), Owned(From), 4882 /*CopyingBaseSubobject=*/true); 4883 if (Copy.isInvalid()) { 4884 Diag(CurrentLocation, diag::note_member_synthesized_at) 4885 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4886 CopyAssignOperator->setInvalidDecl(); 4887 return; 4888 } 4889 4890 // Success! Record the copy. 4891 Statements.push_back(Copy.takeAs<Expr>()); 4892 } 4893 4894 // \brief Reference to the __builtin_memcpy function. 4895 Expr *BuiltinMemCpyRef = 0; 4896 // \brief Reference to the __builtin_objc_memmove_collectable function. 4897 Expr *CollectableMemCpyRef = 0; 4898 4899 // Assign non-static members. 4900 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4901 FieldEnd = ClassDecl->field_end(); 4902 Field != FieldEnd; ++Field) { 4903 // Check for members of reference type; we can't copy those. 4904 if (Field->getType()->isReferenceType()) { 4905 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4906 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4907 Diag(Field->getLocation(), diag::note_declared_at); 4908 Diag(CurrentLocation, diag::note_member_synthesized_at) 4909 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4910 Invalid = true; 4911 continue; 4912 } 4913 4914 // Check for members of const-qualified, non-class type. 4915 QualType BaseType = Context.getBaseElementType(Field->getType()); 4916 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4917 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4918 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4919 Diag(Field->getLocation(), diag::note_declared_at); 4920 Diag(CurrentLocation, diag::note_member_synthesized_at) 4921 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4922 Invalid = true; 4923 continue; 4924 } 4925 4926 QualType FieldType = Field->getType().getNonReferenceType(); 4927 if (FieldType->isIncompleteArrayType()) { 4928 assert(ClassDecl->hasFlexibleArrayMember() && 4929 "Incomplete array type is not valid"); 4930 continue; 4931 } 4932 4933 // Build references to the field in the object we're copying from and to. 4934 CXXScopeSpec SS; // Intentionally empty 4935 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4936 LookupMemberName); 4937 MemberLookup.addDecl(*Field); 4938 MemberLookup.resolveKind(); 4939 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4940 OtherRefType, 4941 Loc, /*IsArrow=*/false, 4942 SS, 0, MemberLookup, 0); 4943 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4944 This->getType(), 4945 Loc, /*IsArrow=*/true, 4946 SS, 0, MemberLookup, 0); 4947 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4948 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4949 4950 // If the field should be copied with __builtin_memcpy rather than via 4951 // explicit assignments, do so. This optimization only applies for arrays 4952 // of scalars and arrays of class type with trivial copy-assignment 4953 // operators. 4954 if (FieldType->isArrayType() && 4955 (!BaseType->isRecordType() || 4956 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4957 ->hasTrivialCopyAssignment())) { 4958 // Compute the size of the memory buffer to be copied. 4959 QualType SizeType = Context.getSizeType(); 4960 llvm::APInt Size(Context.getTypeSize(SizeType), 4961 Context.getTypeSizeInChars(BaseType).getQuantity()); 4962 for (const ConstantArrayType *Array 4963 = Context.getAsConstantArrayType(FieldType); 4964 Array; 4965 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4966 llvm::APInt ArraySize = Array->getSize(); 4967 ArraySize.zextOrTrunc(Size.getBitWidth()); 4968 Size *= ArraySize; 4969 } 4970 4971 // Take the address of the field references for "from" and "to". 4972 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4973 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4974 4975 bool NeedsCollectableMemCpy = 4976 (BaseType->isRecordType() && 4977 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4978 4979 if (NeedsCollectableMemCpy) { 4980 if (!CollectableMemCpyRef) { 4981 // Create a reference to the __builtin_objc_memmove_collectable function. 4982 LookupResult R(*this, 4983 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4984 Loc, LookupOrdinaryName); 4985 LookupName(R, TUScope, true); 4986 4987 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4988 if (!CollectableMemCpy) { 4989 // Something went horribly wrong earlier, and we will have 4990 // complained about it. 4991 Invalid = true; 4992 continue; 4993 } 4994 4995 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4996 CollectableMemCpy->getType(), 4997 Loc, 0).takeAs<Expr>(); 4998 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4999 } 5000 } 5001 // Create a reference to the __builtin_memcpy builtin function. 5002 else if (!BuiltinMemCpyRef) { 5003 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5004 LookupOrdinaryName); 5005 LookupName(R, TUScope, true); 5006 5007 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5008 if (!BuiltinMemCpy) { 5009 // Something went horribly wrong earlier, and we will have complained 5010 // about it. 5011 Invalid = true; 5012 continue; 5013 } 5014 5015 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5016 BuiltinMemCpy->getType(), 5017 Loc, 0).takeAs<Expr>(); 5018 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5019 } 5020 5021 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5022 CallArgs.push_back(To.takeAs<Expr>()); 5023 CallArgs.push_back(From.takeAs<Expr>()); 5024 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5025 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5026 Commas.push_back(Loc); 5027 Commas.push_back(Loc); 5028 OwningExprResult Call = ExprError(); 5029 if (NeedsCollectableMemCpy) 5030 Call = ActOnCallExpr(/*Scope=*/0, 5031 Owned(CollectableMemCpyRef->Retain()), 5032 Loc, move_arg(CallArgs), 5033 Commas.data(), Loc); 5034 else 5035 Call = ActOnCallExpr(/*Scope=*/0, 5036 Owned(BuiltinMemCpyRef->Retain()), 5037 Loc, move_arg(CallArgs), 5038 Commas.data(), Loc); 5039 5040 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5041 Statements.push_back(Call.takeAs<Expr>()); 5042 continue; 5043 } 5044 5045 // Build the copy of this field. 5046 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5047 move(To), move(From), 5048 /*CopyingBaseSubobject=*/false); 5049 if (Copy.isInvalid()) { 5050 Diag(CurrentLocation, diag::note_member_synthesized_at) 5051 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5052 CopyAssignOperator->setInvalidDecl(); 5053 return; 5054 } 5055 5056 // Success! Record the copy. 5057 Statements.push_back(Copy.takeAs<Stmt>()); 5058 } 5059 5060 if (!Invalid) { 5061 // Add a "return *this;" 5062 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5063 Owned(This->Retain())); 5064 5065 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5066 if (Return.isInvalid()) 5067 Invalid = true; 5068 else { 5069 Statements.push_back(Return.takeAs<Stmt>()); 5070 5071 if (Trap.hasErrorOccurred()) { 5072 Diag(CurrentLocation, diag::note_member_synthesized_at) 5073 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5074 Invalid = true; 5075 } 5076 } 5077 } 5078 5079 if (Invalid) { 5080 CopyAssignOperator->setInvalidDecl(); 5081 return; 5082 } 5083 5084 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5085 /*isStmtExpr=*/false); 5086 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5087 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5088} 5089 5090CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5091 CXXRecordDecl *ClassDecl) { 5092 // C++ [class.copy]p4: 5093 // If the class definition does not explicitly declare a copy 5094 // constructor, one is declared implicitly. 5095 5096 // C++ [class.copy]p5: 5097 // The implicitly-declared copy constructor for a class X will 5098 // have the form 5099 // 5100 // X::X(const X&) 5101 // 5102 // if 5103 bool HasConstCopyConstructor = true; 5104 5105 // -- each direct or virtual base class B of X has a copy 5106 // constructor whose first parameter is of type const B& or 5107 // const volatile B&, and 5108 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5109 BaseEnd = ClassDecl->bases_end(); 5110 HasConstCopyConstructor && Base != BaseEnd; 5111 ++Base) { 5112 // Virtual bases are handled below. 5113 if (Base->isVirtual()) 5114 continue; 5115 5116 CXXRecordDecl *BaseClassDecl 5117 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5118 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5119 DeclareImplicitCopyConstructor(BaseClassDecl); 5120 5121 HasConstCopyConstructor 5122 = BaseClassDecl->hasConstCopyConstructor(Context); 5123 } 5124 5125 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5126 BaseEnd = ClassDecl->vbases_end(); 5127 HasConstCopyConstructor && Base != BaseEnd; 5128 ++Base) { 5129 CXXRecordDecl *BaseClassDecl 5130 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5131 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5132 DeclareImplicitCopyConstructor(BaseClassDecl); 5133 5134 HasConstCopyConstructor 5135 = BaseClassDecl->hasConstCopyConstructor(Context); 5136 } 5137 5138 // -- for all the nonstatic data members of X that are of a 5139 // class type M (or array thereof), each such class type 5140 // has a copy constructor whose first parameter is of type 5141 // const M& or const volatile M&. 5142 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5143 FieldEnd = ClassDecl->field_end(); 5144 HasConstCopyConstructor && Field != FieldEnd; 5145 ++Field) { 5146 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5147 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5148 CXXRecordDecl *FieldClassDecl 5149 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5150 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5151 DeclareImplicitCopyConstructor(FieldClassDecl); 5152 5153 HasConstCopyConstructor 5154 = FieldClassDecl->hasConstCopyConstructor(Context); 5155 } 5156 } 5157 5158 // Otherwise, the implicitly declared copy constructor will have 5159 // the form 5160 // 5161 // X::X(X&) 5162 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5163 QualType ArgType = ClassType; 5164 if (HasConstCopyConstructor) 5165 ArgType = ArgType.withConst(); 5166 ArgType = Context.getLValueReferenceType(ArgType); 5167 5168 // C++ [except.spec]p14: 5169 // An implicitly declared special member function (Clause 12) shall have an 5170 // exception-specification. [...] 5171 ImplicitExceptionSpecification ExceptSpec(Context); 5172 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5173 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5174 BaseEnd = ClassDecl->bases_end(); 5175 Base != BaseEnd; 5176 ++Base) { 5177 // Virtual bases are handled below. 5178 if (Base->isVirtual()) 5179 continue; 5180 5181 CXXRecordDecl *BaseClassDecl 5182 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5183 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5184 DeclareImplicitCopyConstructor(BaseClassDecl); 5185 5186 if (CXXConstructorDecl *CopyConstructor 5187 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5188 ExceptSpec.CalledDecl(CopyConstructor); 5189 } 5190 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5191 BaseEnd = ClassDecl->vbases_end(); 5192 Base != BaseEnd; 5193 ++Base) { 5194 CXXRecordDecl *BaseClassDecl 5195 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5196 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5197 DeclareImplicitCopyConstructor(BaseClassDecl); 5198 5199 if (CXXConstructorDecl *CopyConstructor 5200 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5201 ExceptSpec.CalledDecl(CopyConstructor); 5202 } 5203 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5204 FieldEnd = ClassDecl->field_end(); 5205 Field != FieldEnd; 5206 ++Field) { 5207 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5208 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5209 CXXRecordDecl *FieldClassDecl 5210 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5211 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5212 DeclareImplicitCopyConstructor(FieldClassDecl); 5213 5214 if (CXXConstructorDecl *CopyConstructor 5215 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5216 ExceptSpec.CalledDecl(CopyConstructor); 5217 } 5218 } 5219 5220 // An implicitly-declared copy constructor is an inline public 5221 // member of its class. 5222 DeclarationName Name 5223 = Context.DeclarationNames.getCXXConstructorName( 5224 Context.getCanonicalType(ClassType)); 5225 CXXConstructorDecl *CopyConstructor 5226 = CXXConstructorDecl::Create(Context, ClassDecl, 5227 ClassDecl->getLocation(), Name, 5228 Context.getFunctionType(Context.VoidTy, 5229 &ArgType, 1, 5230 false, 0, 5231 ExceptSpec.hasExceptionSpecification(), 5232 ExceptSpec.hasAnyExceptionSpecification(), 5233 ExceptSpec.size(), 5234 ExceptSpec.data(), 5235 FunctionType::ExtInfo()), 5236 /*TInfo=*/0, 5237 /*isExplicit=*/false, 5238 /*isInline=*/true, 5239 /*isImplicitlyDeclared=*/true); 5240 CopyConstructor->setAccess(AS_public); 5241 CopyConstructor->setImplicit(); 5242 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5243 5244 // Note that we have declared this constructor. 5245 ClassDecl->setDeclaredCopyConstructor(true); 5246 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5247 5248 // Add the parameter to the constructor. 5249 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5250 ClassDecl->getLocation(), 5251 /*IdentifierInfo=*/0, 5252 ArgType, /*TInfo=*/0, 5253 VarDecl::None, 5254 VarDecl::None, 0); 5255 CopyConstructor->setParams(&FromParam, 1); 5256 if (Scope *S = getScopeForContext(ClassDecl)) 5257 PushOnScopeChains(CopyConstructor, S, false); 5258 ClassDecl->addDecl(CopyConstructor); 5259 5260 return CopyConstructor; 5261} 5262 5263void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5264 CXXConstructorDecl *CopyConstructor, 5265 unsigned TypeQuals) { 5266 assert((CopyConstructor->isImplicit() && 5267 CopyConstructor->isCopyConstructor(TypeQuals) && 5268 !CopyConstructor->isUsed(false)) && 5269 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5270 5271 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5272 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5273 5274 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5275 ErrorTrap Trap(*this); 5276 5277 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5278 Trap.hasErrorOccurred()) { 5279 Diag(CurrentLocation, diag::note_member_synthesized_at) 5280 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5281 CopyConstructor->setInvalidDecl(); 5282 } else { 5283 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5284 CopyConstructor->getLocation(), 5285 MultiStmtArg(*this, 0, 0), 5286 /*isStmtExpr=*/false) 5287 .takeAs<Stmt>()); 5288 } 5289 5290 CopyConstructor->setUsed(); 5291} 5292 5293Sema::OwningExprResult 5294Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5295 CXXConstructorDecl *Constructor, 5296 MultiExprArg ExprArgs, 5297 bool RequiresZeroInit, 5298 CXXConstructExpr::ConstructionKind ConstructKind) { 5299 bool Elidable = false; 5300 5301 // C++0x [class.copy]p34: 5302 // When certain criteria are met, an implementation is allowed to 5303 // omit the copy/move construction of a class object, even if the 5304 // copy/move constructor and/or destructor for the object have 5305 // side effects. [...] 5306 // - when a temporary class object that has not been bound to a 5307 // reference (12.2) would be copied/moved to a class object 5308 // with the same cv-unqualified type, the copy/move operation 5309 // can be omitted by constructing the temporary object 5310 // directly into the target of the omitted copy/move 5311 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5312 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5313 Elidable = SubExpr->isTemporaryObject() && 5314 Context.hasSameUnqualifiedType(SubExpr->getType(), 5315 Context.getTypeDeclType(Constructor->getParent())); 5316 } 5317 5318 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5319 Elidable, move(ExprArgs), RequiresZeroInit, 5320 ConstructKind); 5321} 5322 5323/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5324/// including handling of its default argument expressions. 5325Sema::OwningExprResult 5326Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5327 CXXConstructorDecl *Constructor, bool Elidable, 5328 MultiExprArg ExprArgs, 5329 bool RequiresZeroInit, 5330 CXXConstructExpr::ConstructionKind ConstructKind) { 5331 unsigned NumExprs = ExprArgs.size(); 5332 Expr **Exprs = (Expr **)ExprArgs.release(); 5333 5334 MarkDeclarationReferenced(ConstructLoc, Constructor); 5335 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5336 Constructor, Elidable, Exprs, NumExprs, 5337 RequiresZeroInit, ConstructKind)); 5338} 5339 5340bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5341 CXXConstructorDecl *Constructor, 5342 MultiExprArg Exprs) { 5343 OwningExprResult TempResult = 5344 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5345 move(Exprs)); 5346 if (TempResult.isInvalid()) 5347 return true; 5348 5349 Expr *Temp = TempResult.takeAs<Expr>(); 5350 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5351 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5352 VD->setInit(Temp); 5353 5354 return false; 5355} 5356 5357void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5358 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5359 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5360 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5361 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5362 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5363 CheckDestructorAccess(VD->getLocation(), Destructor, 5364 PDiag(diag::err_access_dtor_var) 5365 << VD->getDeclName() 5366 << VD->getType()); 5367 5368 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5369 Diag(VD->getLocation(), diag::warn_global_destructor); 5370 } 5371} 5372 5373/// AddCXXDirectInitializerToDecl - This action is called immediately after 5374/// ActOnDeclarator, when a C++ direct initializer is present. 5375/// e.g: "int x(1);" 5376void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5377 SourceLocation LParenLoc, 5378 MultiExprArg Exprs, 5379 SourceLocation *CommaLocs, 5380 SourceLocation RParenLoc) { 5381 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5382 Decl *RealDecl = Dcl.getAs<Decl>(); 5383 5384 // If there is no declaration, there was an error parsing it. Just ignore 5385 // the initializer. 5386 if (RealDecl == 0) 5387 return; 5388 5389 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5390 if (!VDecl) { 5391 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5392 RealDecl->setInvalidDecl(); 5393 return; 5394 } 5395 5396 // We will represent direct-initialization similarly to copy-initialization: 5397 // int x(1); -as-> int x = 1; 5398 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5399 // 5400 // Clients that want to distinguish between the two forms, can check for 5401 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5402 // A major benefit is that clients that don't particularly care about which 5403 // exactly form was it (like the CodeGen) can handle both cases without 5404 // special case code. 5405 5406 // C++ 8.5p11: 5407 // The form of initialization (using parentheses or '=') is generally 5408 // insignificant, but does matter when the entity being initialized has a 5409 // class type. 5410 5411 if (!VDecl->getType()->isDependentType() && 5412 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5413 diag::err_typecheck_decl_incomplete_type)) { 5414 VDecl->setInvalidDecl(); 5415 return; 5416 } 5417 5418 // The variable can not have an abstract class type. 5419 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5420 diag::err_abstract_type_in_decl, 5421 AbstractVariableType)) 5422 VDecl->setInvalidDecl(); 5423 5424 const VarDecl *Def; 5425 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5426 Diag(VDecl->getLocation(), diag::err_redefinition) 5427 << VDecl->getDeclName(); 5428 Diag(Def->getLocation(), diag::note_previous_definition); 5429 VDecl->setInvalidDecl(); 5430 return; 5431 } 5432 5433 // If either the declaration has a dependent type or if any of the 5434 // expressions is type-dependent, we represent the initialization 5435 // via a ParenListExpr for later use during template instantiation. 5436 if (VDecl->getType()->isDependentType() || 5437 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5438 // Let clients know that initialization was done with a direct initializer. 5439 VDecl->setCXXDirectInitializer(true); 5440 5441 // Store the initialization expressions as a ParenListExpr. 5442 unsigned NumExprs = Exprs.size(); 5443 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5444 (Expr **)Exprs.release(), 5445 NumExprs, RParenLoc)); 5446 return; 5447 } 5448 5449 // Capture the variable that is being initialized and the style of 5450 // initialization. 5451 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5452 5453 // FIXME: Poor source location information. 5454 InitializationKind Kind 5455 = InitializationKind::CreateDirect(VDecl->getLocation(), 5456 LParenLoc, RParenLoc); 5457 5458 InitializationSequence InitSeq(*this, Entity, Kind, 5459 (Expr**)Exprs.get(), Exprs.size()); 5460 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5461 if (Result.isInvalid()) { 5462 VDecl->setInvalidDecl(); 5463 return; 5464 } 5465 5466 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5467 VDecl->setInit(Result.takeAs<Expr>()); 5468 VDecl->setCXXDirectInitializer(true); 5469 5470 if (!VDecl->isInvalidDecl() && 5471 !VDecl->getDeclContext()->isDependentContext() && 5472 VDecl->hasGlobalStorage() && 5473 !VDecl->getInit()->isConstantInitializer(Context, 5474 VDecl->getType()->isReferenceType())) 5475 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5476 << VDecl->getInit()->getSourceRange(); 5477 5478 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5479 FinalizeVarWithDestructor(VDecl, Record); 5480} 5481 5482/// \brief Given a constructor and the set of arguments provided for the 5483/// constructor, convert the arguments and add any required default arguments 5484/// to form a proper call to this constructor. 5485/// 5486/// \returns true if an error occurred, false otherwise. 5487bool 5488Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5489 MultiExprArg ArgsPtr, 5490 SourceLocation Loc, 5491 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5492 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5493 unsigned NumArgs = ArgsPtr.size(); 5494 Expr **Args = (Expr **)ArgsPtr.get(); 5495 5496 const FunctionProtoType *Proto 5497 = Constructor->getType()->getAs<FunctionProtoType>(); 5498 assert(Proto && "Constructor without a prototype?"); 5499 unsigned NumArgsInProto = Proto->getNumArgs(); 5500 5501 // If too few arguments are available, we'll fill in the rest with defaults. 5502 if (NumArgs < NumArgsInProto) 5503 ConvertedArgs.reserve(NumArgsInProto); 5504 else 5505 ConvertedArgs.reserve(NumArgs); 5506 5507 VariadicCallType CallType = 5508 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5509 llvm::SmallVector<Expr *, 8> AllArgs; 5510 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5511 Proto, 0, Args, NumArgs, AllArgs, 5512 CallType); 5513 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5514 ConvertedArgs.push_back(AllArgs[i]); 5515 return Invalid; 5516} 5517 5518static inline bool 5519CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5520 const FunctionDecl *FnDecl) { 5521 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5522 if (isa<NamespaceDecl>(DC)) { 5523 return SemaRef.Diag(FnDecl->getLocation(), 5524 diag::err_operator_new_delete_declared_in_namespace) 5525 << FnDecl->getDeclName(); 5526 } 5527 5528 if (isa<TranslationUnitDecl>(DC) && 5529 FnDecl->getStorageClass() == FunctionDecl::Static) { 5530 return SemaRef.Diag(FnDecl->getLocation(), 5531 diag::err_operator_new_delete_declared_static) 5532 << FnDecl->getDeclName(); 5533 } 5534 5535 return false; 5536} 5537 5538static inline bool 5539CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5540 CanQualType ExpectedResultType, 5541 CanQualType ExpectedFirstParamType, 5542 unsigned DependentParamTypeDiag, 5543 unsigned InvalidParamTypeDiag) { 5544 QualType ResultType = 5545 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5546 5547 // Check that the result type is not dependent. 5548 if (ResultType->isDependentType()) 5549 return SemaRef.Diag(FnDecl->getLocation(), 5550 diag::err_operator_new_delete_dependent_result_type) 5551 << FnDecl->getDeclName() << ExpectedResultType; 5552 5553 // Check that the result type is what we expect. 5554 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5555 return SemaRef.Diag(FnDecl->getLocation(), 5556 diag::err_operator_new_delete_invalid_result_type) 5557 << FnDecl->getDeclName() << ExpectedResultType; 5558 5559 // A function template must have at least 2 parameters. 5560 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5561 return SemaRef.Diag(FnDecl->getLocation(), 5562 diag::err_operator_new_delete_template_too_few_parameters) 5563 << FnDecl->getDeclName(); 5564 5565 // The function decl must have at least 1 parameter. 5566 if (FnDecl->getNumParams() == 0) 5567 return SemaRef.Diag(FnDecl->getLocation(), 5568 diag::err_operator_new_delete_too_few_parameters) 5569 << FnDecl->getDeclName(); 5570 5571 // Check the the first parameter type is not dependent. 5572 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5573 if (FirstParamType->isDependentType()) 5574 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5575 << FnDecl->getDeclName() << ExpectedFirstParamType; 5576 5577 // Check that the first parameter type is what we expect. 5578 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5579 ExpectedFirstParamType) 5580 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5581 << FnDecl->getDeclName() << ExpectedFirstParamType; 5582 5583 return false; 5584} 5585 5586static bool 5587CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5588 // C++ [basic.stc.dynamic.allocation]p1: 5589 // A program is ill-formed if an allocation function is declared in a 5590 // namespace scope other than global scope or declared static in global 5591 // scope. 5592 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5593 return true; 5594 5595 CanQualType SizeTy = 5596 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5597 5598 // C++ [basic.stc.dynamic.allocation]p1: 5599 // The return type shall be void*. The first parameter shall have type 5600 // std::size_t. 5601 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5602 SizeTy, 5603 diag::err_operator_new_dependent_param_type, 5604 diag::err_operator_new_param_type)) 5605 return true; 5606 5607 // C++ [basic.stc.dynamic.allocation]p1: 5608 // The first parameter shall not have an associated default argument. 5609 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5610 return SemaRef.Diag(FnDecl->getLocation(), 5611 diag::err_operator_new_default_arg) 5612 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5613 5614 return false; 5615} 5616 5617static bool 5618CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5619 // C++ [basic.stc.dynamic.deallocation]p1: 5620 // A program is ill-formed if deallocation functions are declared in a 5621 // namespace scope other than global scope or declared static in global 5622 // scope. 5623 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5624 return true; 5625 5626 // C++ [basic.stc.dynamic.deallocation]p2: 5627 // Each deallocation function shall return void and its first parameter 5628 // shall be void*. 5629 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5630 SemaRef.Context.VoidPtrTy, 5631 diag::err_operator_delete_dependent_param_type, 5632 diag::err_operator_delete_param_type)) 5633 return true; 5634 5635 return false; 5636} 5637 5638/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5639/// of this overloaded operator is well-formed. If so, returns false; 5640/// otherwise, emits appropriate diagnostics and returns true. 5641bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5642 assert(FnDecl && FnDecl->isOverloadedOperator() && 5643 "Expected an overloaded operator declaration"); 5644 5645 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5646 5647 // C++ [over.oper]p5: 5648 // The allocation and deallocation functions, operator new, 5649 // operator new[], operator delete and operator delete[], are 5650 // described completely in 3.7.3. The attributes and restrictions 5651 // found in the rest of this subclause do not apply to them unless 5652 // explicitly stated in 3.7.3. 5653 if (Op == OO_Delete || Op == OO_Array_Delete) 5654 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5655 5656 if (Op == OO_New || Op == OO_Array_New) 5657 return CheckOperatorNewDeclaration(*this, FnDecl); 5658 5659 // C++ [over.oper]p6: 5660 // An operator function shall either be a non-static member 5661 // function or be a non-member function and have at least one 5662 // parameter whose type is a class, a reference to a class, an 5663 // enumeration, or a reference to an enumeration. 5664 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5665 if (MethodDecl->isStatic()) 5666 return Diag(FnDecl->getLocation(), 5667 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5668 } else { 5669 bool ClassOrEnumParam = false; 5670 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5671 ParamEnd = FnDecl->param_end(); 5672 Param != ParamEnd; ++Param) { 5673 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5674 if (ParamType->isDependentType() || ParamType->isRecordType() || 5675 ParamType->isEnumeralType()) { 5676 ClassOrEnumParam = true; 5677 break; 5678 } 5679 } 5680 5681 if (!ClassOrEnumParam) 5682 return Diag(FnDecl->getLocation(), 5683 diag::err_operator_overload_needs_class_or_enum) 5684 << FnDecl->getDeclName(); 5685 } 5686 5687 // C++ [over.oper]p8: 5688 // An operator function cannot have default arguments (8.3.6), 5689 // except where explicitly stated below. 5690 // 5691 // Only the function-call operator allows default arguments 5692 // (C++ [over.call]p1). 5693 if (Op != OO_Call) { 5694 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5695 Param != FnDecl->param_end(); ++Param) { 5696 if ((*Param)->hasDefaultArg()) 5697 return Diag((*Param)->getLocation(), 5698 diag::err_operator_overload_default_arg) 5699 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5700 } 5701 } 5702 5703 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5704 { false, false, false } 5705#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5706 , { Unary, Binary, MemberOnly } 5707#include "clang/Basic/OperatorKinds.def" 5708 }; 5709 5710 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5711 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5712 bool MustBeMemberOperator = OperatorUses[Op][2]; 5713 5714 // C++ [over.oper]p8: 5715 // [...] Operator functions cannot have more or fewer parameters 5716 // than the number required for the corresponding operator, as 5717 // described in the rest of this subclause. 5718 unsigned NumParams = FnDecl->getNumParams() 5719 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5720 if (Op != OO_Call && 5721 ((NumParams == 1 && !CanBeUnaryOperator) || 5722 (NumParams == 2 && !CanBeBinaryOperator) || 5723 (NumParams < 1) || (NumParams > 2))) { 5724 // We have the wrong number of parameters. 5725 unsigned ErrorKind; 5726 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5727 ErrorKind = 2; // 2 -> unary or binary. 5728 } else if (CanBeUnaryOperator) { 5729 ErrorKind = 0; // 0 -> unary 5730 } else { 5731 assert(CanBeBinaryOperator && 5732 "All non-call overloaded operators are unary or binary!"); 5733 ErrorKind = 1; // 1 -> binary 5734 } 5735 5736 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5737 << FnDecl->getDeclName() << NumParams << ErrorKind; 5738 } 5739 5740 // Overloaded operators other than operator() cannot be variadic. 5741 if (Op != OO_Call && 5742 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5743 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5744 << FnDecl->getDeclName(); 5745 } 5746 5747 // Some operators must be non-static member functions. 5748 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5749 return Diag(FnDecl->getLocation(), 5750 diag::err_operator_overload_must_be_member) 5751 << FnDecl->getDeclName(); 5752 } 5753 5754 // C++ [over.inc]p1: 5755 // The user-defined function called operator++ implements the 5756 // prefix and postfix ++ operator. If this function is a member 5757 // function with no parameters, or a non-member function with one 5758 // parameter of class or enumeration type, it defines the prefix 5759 // increment operator ++ for objects of that type. If the function 5760 // is a member function with one parameter (which shall be of type 5761 // int) or a non-member function with two parameters (the second 5762 // of which shall be of type int), it defines the postfix 5763 // increment operator ++ for objects of that type. 5764 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5765 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5766 bool ParamIsInt = false; 5767 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5768 ParamIsInt = BT->getKind() == BuiltinType::Int; 5769 5770 if (!ParamIsInt) 5771 return Diag(LastParam->getLocation(), 5772 diag::err_operator_overload_post_incdec_must_be_int) 5773 << LastParam->getType() << (Op == OO_MinusMinus); 5774 } 5775 5776 // Notify the class if it got an assignment operator. 5777 if (Op == OO_Equal) { 5778 // Would have returned earlier otherwise. 5779 assert(isa<CXXMethodDecl>(FnDecl) && 5780 "Overloaded = not member, but not filtered."); 5781 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5782 Method->getParent()->addedAssignmentOperator(Context, Method); 5783 } 5784 5785 return false; 5786} 5787 5788/// CheckLiteralOperatorDeclaration - Check whether the declaration 5789/// of this literal operator function is well-formed. If so, returns 5790/// false; otherwise, emits appropriate diagnostics and returns true. 5791bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5792 DeclContext *DC = FnDecl->getDeclContext(); 5793 Decl::Kind Kind = DC->getDeclKind(); 5794 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5795 Kind != Decl::LinkageSpec) { 5796 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5797 << FnDecl->getDeclName(); 5798 return true; 5799 } 5800 5801 bool Valid = false; 5802 5803 // template <char...> type operator "" name() is the only valid template 5804 // signature, and the only valid signature with no parameters. 5805 if (FnDecl->param_size() == 0) { 5806 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5807 // Must have only one template parameter 5808 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5809 if (Params->size() == 1) { 5810 NonTypeTemplateParmDecl *PmDecl = 5811 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5812 5813 // The template parameter must be a char parameter pack. 5814 // FIXME: This test will always fail because non-type parameter packs 5815 // have not been implemented. 5816 if (PmDecl && PmDecl->isTemplateParameterPack() && 5817 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5818 Valid = true; 5819 } 5820 } 5821 } else { 5822 // Check the first parameter 5823 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5824 5825 QualType T = (*Param)->getType(); 5826 5827 // unsigned long long int, long double, and any character type are allowed 5828 // as the only parameters. 5829 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5830 Context.hasSameType(T, Context.LongDoubleTy) || 5831 Context.hasSameType(T, Context.CharTy) || 5832 Context.hasSameType(T, Context.WCharTy) || 5833 Context.hasSameType(T, Context.Char16Ty) || 5834 Context.hasSameType(T, Context.Char32Ty)) { 5835 if (++Param == FnDecl->param_end()) 5836 Valid = true; 5837 goto FinishedParams; 5838 } 5839 5840 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5841 const PointerType *PT = T->getAs<PointerType>(); 5842 if (!PT) 5843 goto FinishedParams; 5844 T = PT->getPointeeType(); 5845 if (!T.isConstQualified()) 5846 goto FinishedParams; 5847 T = T.getUnqualifiedType(); 5848 5849 // Move on to the second parameter; 5850 ++Param; 5851 5852 // If there is no second parameter, the first must be a const char * 5853 if (Param == FnDecl->param_end()) { 5854 if (Context.hasSameType(T, Context.CharTy)) 5855 Valid = true; 5856 goto FinishedParams; 5857 } 5858 5859 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5860 // are allowed as the first parameter to a two-parameter function 5861 if (!(Context.hasSameType(T, Context.CharTy) || 5862 Context.hasSameType(T, Context.WCharTy) || 5863 Context.hasSameType(T, Context.Char16Ty) || 5864 Context.hasSameType(T, Context.Char32Ty))) 5865 goto FinishedParams; 5866 5867 // The second and final parameter must be an std::size_t 5868 T = (*Param)->getType().getUnqualifiedType(); 5869 if (Context.hasSameType(T, Context.getSizeType()) && 5870 ++Param == FnDecl->param_end()) 5871 Valid = true; 5872 } 5873 5874 // FIXME: This diagnostic is absolutely terrible. 5875FinishedParams: 5876 if (!Valid) { 5877 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5878 << FnDecl->getDeclName(); 5879 return true; 5880 } 5881 5882 return false; 5883} 5884 5885/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5886/// linkage specification, including the language and (if present) 5887/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5888/// the location of the language string literal, which is provided 5889/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5890/// the '{' brace. Otherwise, this linkage specification does not 5891/// have any braces. 5892Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5893 SourceLocation ExternLoc, 5894 SourceLocation LangLoc, 5895 llvm::StringRef Lang, 5896 SourceLocation LBraceLoc) { 5897 LinkageSpecDecl::LanguageIDs Language; 5898 if (Lang == "\"C\"") 5899 Language = LinkageSpecDecl::lang_c; 5900 else if (Lang == "\"C++\"") 5901 Language = LinkageSpecDecl::lang_cxx; 5902 else { 5903 Diag(LangLoc, diag::err_bad_language); 5904 return DeclPtrTy(); 5905 } 5906 5907 // FIXME: Add all the various semantics of linkage specifications 5908 5909 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5910 LangLoc, Language, 5911 LBraceLoc.isValid()); 5912 CurContext->addDecl(D); 5913 PushDeclContext(S, D); 5914 return DeclPtrTy::make(D); 5915} 5916 5917/// ActOnFinishLinkageSpecification - Complete the definition of 5918/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5919/// valid, it's the position of the closing '}' brace in a linkage 5920/// specification that uses braces. 5921Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5922 DeclPtrTy LinkageSpec, 5923 SourceLocation RBraceLoc) { 5924 if (LinkageSpec) 5925 PopDeclContext(); 5926 return LinkageSpec; 5927} 5928 5929/// \brief Perform semantic analysis for the variable declaration that 5930/// occurs within a C++ catch clause, returning the newly-created 5931/// variable. 5932VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5933 TypeSourceInfo *TInfo, 5934 IdentifierInfo *Name, 5935 SourceLocation Loc, 5936 SourceRange Range) { 5937 bool Invalid = false; 5938 5939 // Arrays and functions decay. 5940 if (ExDeclType->isArrayType()) 5941 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5942 else if (ExDeclType->isFunctionType()) 5943 ExDeclType = Context.getPointerType(ExDeclType); 5944 5945 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5946 // The exception-declaration shall not denote a pointer or reference to an 5947 // incomplete type, other than [cv] void*. 5948 // N2844 forbids rvalue references. 5949 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5950 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5951 Invalid = true; 5952 } 5953 5954 // GCC allows catching pointers and references to incomplete types 5955 // as an extension; so do we, but we warn by default. 5956 5957 QualType BaseType = ExDeclType; 5958 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5959 unsigned DK = diag::err_catch_incomplete; 5960 bool IncompleteCatchIsInvalid = true; 5961 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5962 BaseType = Ptr->getPointeeType(); 5963 Mode = 1; 5964 DK = diag::ext_catch_incomplete_ptr; 5965 IncompleteCatchIsInvalid = false; 5966 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5967 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5968 BaseType = Ref->getPointeeType(); 5969 Mode = 2; 5970 DK = diag::ext_catch_incomplete_ref; 5971 IncompleteCatchIsInvalid = false; 5972 } 5973 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5974 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5975 IncompleteCatchIsInvalid) 5976 Invalid = true; 5977 5978 if (!Invalid && !ExDeclType->isDependentType() && 5979 RequireNonAbstractType(Loc, ExDeclType, 5980 diag::err_abstract_type_in_decl, 5981 AbstractVariableType)) 5982 Invalid = true; 5983 5984 // Only the non-fragile NeXT runtime currently supports C++ catches 5985 // of ObjC types, and no runtime supports catching ObjC types by value. 5986 if (!Invalid && getLangOptions().ObjC1) { 5987 QualType T = ExDeclType; 5988 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5989 T = RT->getPointeeType(); 5990 5991 if (T->isObjCObjectType()) { 5992 Diag(Loc, diag::err_objc_object_catch); 5993 Invalid = true; 5994 } else if (T->isObjCObjectPointerType()) { 5995 if (!getLangOptions().NeXTRuntime) { 5996 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 5997 Invalid = true; 5998 } else if (!getLangOptions().ObjCNonFragileABI) { 5999 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6000 Invalid = true; 6001 } 6002 } 6003 } 6004 6005 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6006 Name, ExDeclType, TInfo, VarDecl::None, 6007 VarDecl::None); 6008 ExDecl->setExceptionVariable(true); 6009 6010 if (!Invalid) { 6011 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6012 // C++ [except.handle]p16: 6013 // The object declared in an exception-declaration or, if the 6014 // exception-declaration does not specify a name, a temporary (12.2) is 6015 // copy-initialized (8.5) from the exception object. [...] 6016 // The object is destroyed when the handler exits, after the destruction 6017 // of any automatic objects initialized within the handler. 6018 // 6019 // We just pretend to initialize the object with itself, then make sure 6020 // it can be destroyed later. 6021 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6022 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6023 Loc, ExDeclType, 0); 6024 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6025 SourceLocation()); 6026 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6027 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6028 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6029 if (Result.isInvalid()) 6030 Invalid = true; 6031 else 6032 FinalizeVarWithDestructor(ExDecl, RecordTy); 6033 } 6034 } 6035 6036 if (Invalid) 6037 ExDecl->setInvalidDecl(); 6038 6039 return ExDecl; 6040} 6041 6042/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6043/// handler. 6044Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6045 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6046 QualType ExDeclType = TInfo->getType(); 6047 6048 bool Invalid = D.isInvalidType(); 6049 IdentifierInfo *II = D.getIdentifier(); 6050 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6051 LookupOrdinaryName, 6052 ForRedeclaration)) { 6053 // The scope should be freshly made just for us. There is just no way 6054 // it contains any previous declaration. 6055 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6056 if (PrevDecl->isTemplateParameter()) { 6057 // Maybe we will complain about the shadowed template parameter. 6058 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6059 } 6060 } 6061 6062 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6063 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6064 << D.getCXXScopeSpec().getRange(); 6065 Invalid = true; 6066 } 6067 6068 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6069 D.getIdentifier(), 6070 D.getIdentifierLoc(), 6071 D.getDeclSpec().getSourceRange()); 6072 6073 if (Invalid) 6074 ExDecl->setInvalidDecl(); 6075 6076 // Add the exception declaration into this scope. 6077 if (II) 6078 PushOnScopeChains(ExDecl, S); 6079 else 6080 CurContext->addDecl(ExDecl); 6081 6082 ProcessDeclAttributes(S, ExDecl, D); 6083 return DeclPtrTy::make(ExDecl); 6084} 6085 6086Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6087 ExprArg assertexpr, 6088 ExprArg assertmessageexpr) { 6089 Expr *AssertExpr = (Expr *)assertexpr.get(); 6090 StringLiteral *AssertMessage = 6091 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6092 6093 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6094 llvm::APSInt Value(32); 6095 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6096 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6097 AssertExpr->getSourceRange(); 6098 return DeclPtrTy(); 6099 } 6100 6101 if (Value == 0) { 6102 Diag(AssertLoc, diag::err_static_assert_failed) 6103 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6104 } 6105 } 6106 6107 assertexpr.release(); 6108 assertmessageexpr.release(); 6109 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6110 AssertExpr, AssertMessage); 6111 6112 CurContext->addDecl(Decl); 6113 return DeclPtrTy::make(Decl); 6114} 6115 6116/// \brief Perform semantic analysis of the given friend type declaration. 6117/// 6118/// \returns A friend declaration that. 6119FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6120 TypeSourceInfo *TSInfo) { 6121 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6122 6123 QualType T = TSInfo->getType(); 6124 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6125 6126 if (!getLangOptions().CPlusPlus0x) { 6127 // C++03 [class.friend]p2: 6128 // An elaborated-type-specifier shall be used in a friend declaration 6129 // for a class.* 6130 // 6131 // * The class-key of the elaborated-type-specifier is required. 6132 if (!ActiveTemplateInstantiations.empty()) { 6133 // Do not complain about the form of friend template types during 6134 // template instantiation; we will already have complained when the 6135 // template was declared. 6136 } else if (!T->isElaboratedTypeSpecifier()) { 6137 // If we evaluated the type to a record type, suggest putting 6138 // a tag in front. 6139 if (const RecordType *RT = T->getAs<RecordType>()) { 6140 RecordDecl *RD = RT->getDecl(); 6141 6142 std::string InsertionText = std::string(" ") + RD->getKindName(); 6143 6144 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6145 << (unsigned) RD->getTagKind() 6146 << T 6147 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6148 InsertionText); 6149 } else { 6150 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6151 << T 6152 << SourceRange(FriendLoc, TypeRange.getEnd()); 6153 } 6154 } else if (T->getAs<EnumType>()) { 6155 Diag(FriendLoc, diag::ext_enum_friend) 6156 << T 6157 << SourceRange(FriendLoc, TypeRange.getEnd()); 6158 } 6159 } 6160 6161 // C++0x [class.friend]p3: 6162 // If the type specifier in a friend declaration designates a (possibly 6163 // cv-qualified) class type, that class is declared as a friend; otherwise, 6164 // the friend declaration is ignored. 6165 6166 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6167 // in [class.friend]p3 that we do not implement. 6168 6169 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6170} 6171 6172/// Handle a friend type declaration. This works in tandem with 6173/// ActOnTag. 6174/// 6175/// Notes on friend class templates: 6176/// 6177/// We generally treat friend class declarations as if they were 6178/// declaring a class. So, for example, the elaborated type specifier 6179/// in a friend declaration is required to obey the restrictions of a 6180/// class-head (i.e. no typedefs in the scope chain), template 6181/// parameters are required to match up with simple template-ids, &c. 6182/// However, unlike when declaring a template specialization, it's 6183/// okay to refer to a template specialization without an empty 6184/// template parameter declaration, e.g. 6185/// friend class A<T>::B<unsigned>; 6186/// We permit this as a special case; if there are any template 6187/// parameters present at all, require proper matching, i.e. 6188/// template <> template <class T> friend class A<int>::B; 6189Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6190 MultiTemplateParamsArg TempParams) { 6191 SourceLocation Loc = DS.getSourceRange().getBegin(); 6192 6193 assert(DS.isFriendSpecified()); 6194 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6195 6196 // Try to convert the decl specifier to a type. This works for 6197 // friend templates because ActOnTag never produces a ClassTemplateDecl 6198 // for a TUK_Friend. 6199 Declarator TheDeclarator(DS, Declarator::MemberContext); 6200 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6201 QualType T = TSI->getType(); 6202 if (TheDeclarator.isInvalidType()) 6203 return DeclPtrTy(); 6204 6205 // This is definitely an error in C++98. It's probably meant to 6206 // be forbidden in C++0x, too, but the specification is just 6207 // poorly written. 6208 // 6209 // The problem is with declarations like the following: 6210 // template <T> friend A<T>::foo; 6211 // where deciding whether a class C is a friend or not now hinges 6212 // on whether there exists an instantiation of A that causes 6213 // 'foo' to equal C. There are restrictions on class-heads 6214 // (which we declare (by fiat) elaborated friend declarations to 6215 // be) that makes this tractable. 6216 // 6217 // FIXME: handle "template <> friend class A<T>;", which 6218 // is possibly well-formed? Who even knows? 6219 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6220 Diag(Loc, diag::err_tagless_friend_type_template) 6221 << DS.getSourceRange(); 6222 return DeclPtrTy(); 6223 } 6224 6225 // C++98 [class.friend]p1: A friend of a class is a function 6226 // or class that is not a member of the class . . . 6227 // This is fixed in DR77, which just barely didn't make the C++03 6228 // deadline. It's also a very silly restriction that seriously 6229 // affects inner classes and which nobody else seems to implement; 6230 // thus we never diagnose it, not even in -pedantic. 6231 // 6232 // But note that we could warn about it: it's always useless to 6233 // friend one of your own members (it's not, however, worthless to 6234 // friend a member of an arbitrary specialization of your template). 6235 6236 Decl *D; 6237 if (unsigned NumTempParamLists = TempParams.size()) 6238 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6239 NumTempParamLists, 6240 (TemplateParameterList**) TempParams.release(), 6241 TSI, 6242 DS.getFriendSpecLoc()); 6243 else 6244 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6245 6246 if (!D) 6247 return DeclPtrTy(); 6248 6249 D->setAccess(AS_public); 6250 CurContext->addDecl(D); 6251 6252 return DeclPtrTy::make(D); 6253} 6254 6255Sema::DeclPtrTy 6256Sema::ActOnFriendFunctionDecl(Scope *S, 6257 Declarator &D, 6258 bool IsDefinition, 6259 MultiTemplateParamsArg TemplateParams) { 6260 const DeclSpec &DS = D.getDeclSpec(); 6261 6262 assert(DS.isFriendSpecified()); 6263 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6264 6265 SourceLocation Loc = D.getIdentifierLoc(); 6266 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6267 QualType T = TInfo->getType(); 6268 6269 // C++ [class.friend]p1 6270 // A friend of a class is a function or class.... 6271 // Note that this sees through typedefs, which is intended. 6272 // It *doesn't* see through dependent types, which is correct 6273 // according to [temp.arg.type]p3: 6274 // If a declaration acquires a function type through a 6275 // type dependent on a template-parameter and this causes 6276 // a declaration that does not use the syntactic form of a 6277 // function declarator to have a function type, the program 6278 // is ill-formed. 6279 if (!T->isFunctionType()) { 6280 Diag(Loc, diag::err_unexpected_friend); 6281 6282 // It might be worthwhile to try to recover by creating an 6283 // appropriate declaration. 6284 return DeclPtrTy(); 6285 } 6286 6287 // C++ [namespace.memdef]p3 6288 // - If a friend declaration in a non-local class first declares a 6289 // class or function, the friend class or function is a member 6290 // of the innermost enclosing namespace. 6291 // - The name of the friend is not found by simple name lookup 6292 // until a matching declaration is provided in that namespace 6293 // scope (either before or after the class declaration granting 6294 // friendship). 6295 // - If a friend function is called, its name may be found by the 6296 // name lookup that considers functions from namespaces and 6297 // classes associated with the types of the function arguments. 6298 // - When looking for a prior declaration of a class or a function 6299 // declared as a friend, scopes outside the innermost enclosing 6300 // namespace scope are not considered. 6301 6302 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6303 DeclarationName Name = GetNameForDeclarator(D); 6304 assert(Name); 6305 6306 // The context we found the declaration in, or in which we should 6307 // create the declaration. 6308 DeclContext *DC; 6309 6310 // FIXME: handle local classes 6311 6312 // Recover from invalid scope qualifiers as if they just weren't there. 6313 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6314 ForRedeclaration); 6315 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6316 DC = computeDeclContext(ScopeQual); 6317 6318 // FIXME: handle dependent contexts 6319 if (!DC) return DeclPtrTy(); 6320 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6321 6322 LookupQualifiedName(Previous, DC); 6323 6324 // Ignore things found implicitly in the wrong scope. 6325 // TODO: better diagnostics for this case. Suggesting the right 6326 // qualified scope would be nice... 6327 LookupResult::Filter F = Previous.makeFilter(); 6328 while (F.hasNext()) { 6329 NamedDecl *D = F.next(); 6330 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6331 F.erase(); 6332 } 6333 F.done(); 6334 6335 if (Previous.empty()) { 6336 D.setInvalidType(); 6337 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6338 return DeclPtrTy(); 6339 } 6340 6341 // C++ [class.friend]p1: A friend of a class is a function or 6342 // class that is not a member of the class . . . 6343 if (DC->Equals(CurContext)) 6344 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6345 6346 // Otherwise walk out to the nearest namespace scope looking for matches. 6347 } else { 6348 // TODO: handle local class contexts. 6349 6350 DC = CurContext; 6351 while (true) { 6352 // Skip class contexts. If someone can cite chapter and verse 6353 // for this behavior, that would be nice --- it's what GCC and 6354 // EDG do, and it seems like a reasonable intent, but the spec 6355 // really only says that checks for unqualified existing 6356 // declarations should stop at the nearest enclosing namespace, 6357 // not that they should only consider the nearest enclosing 6358 // namespace. 6359 while (DC->isRecord()) 6360 DC = DC->getParent(); 6361 6362 LookupQualifiedName(Previous, DC); 6363 6364 // TODO: decide what we think about using declarations. 6365 if (!Previous.empty()) 6366 break; 6367 6368 if (DC->isFileContext()) break; 6369 DC = DC->getParent(); 6370 } 6371 6372 // C++ [class.friend]p1: A friend of a class is a function or 6373 // class that is not a member of the class . . . 6374 // C++0x changes this for both friend types and functions. 6375 // Most C++ 98 compilers do seem to give an error here, so 6376 // we do, too. 6377 if (!Previous.empty() && DC->Equals(CurContext) 6378 && !getLangOptions().CPlusPlus0x) 6379 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6380 } 6381 6382 if (DC->isFileContext()) { 6383 // This implies that it has to be an operator or function. 6384 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6385 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6386 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6387 Diag(Loc, diag::err_introducing_special_friend) << 6388 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6389 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6390 return DeclPtrTy(); 6391 } 6392 } 6393 6394 bool Redeclaration = false; 6395 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6396 move(TemplateParams), 6397 IsDefinition, 6398 Redeclaration); 6399 if (!ND) return DeclPtrTy(); 6400 6401 assert(ND->getDeclContext() == DC); 6402 assert(ND->getLexicalDeclContext() == CurContext); 6403 6404 // Add the function declaration to the appropriate lookup tables, 6405 // adjusting the redeclarations list as necessary. We don't 6406 // want to do this yet if the friending class is dependent. 6407 // 6408 // Also update the scope-based lookup if the target context's 6409 // lookup context is in lexical scope. 6410 if (!CurContext->isDependentContext()) { 6411 DC = DC->getLookupContext(); 6412 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6413 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6414 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6415 } 6416 6417 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6418 D.getIdentifierLoc(), ND, 6419 DS.getFriendSpecLoc()); 6420 FrD->setAccess(AS_public); 6421 CurContext->addDecl(FrD); 6422 6423 return DeclPtrTy::make(ND); 6424} 6425 6426void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6427 AdjustDeclIfTemplate(dcl); 6428 6429 Decl *Dcl = dcl.getAs<Decl>(); 6430 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6431 if (!Fn) { 6432 Diag(DelLoc, diag::err_deleted_non_function); 6433 return; 6434 } 6435 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6436 Diag(DelLoc, diag::err_deleted_decl_not_first); 6437 Diag(Prev->getLocation(), diag::note_previous_declaration); 6438 // If the declaration wasn't the first, we delete the function anyway for 6439 // recovery. 6440 } 6441 Fn->setDeleted(); 6442} 6443 6444static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6445 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6446 ++CI) { 6447 Stmt *SubStmt = *CI; 6448 if (!SubStmt) 6449 continue; 6450 if (isa<ReturnStmt>(SubStmt)) 6451 Self.Diag(SubStmt->getSourceRange().getBegin(), 6452 diag::err_return_in_constructor_handler); 6453 if (!isa<Expr>(SubStmt)) 6454 SearchForReturnInStmt(Self, SubStmt); 6455 } 6456} 6457 6458void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6459 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6460 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6461 SearchForReturnInStmt(*this, Handler); 6462 } 6463} 6464 6465bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6466 const CXXMethodDecl *Old) { 6467 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6468 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6469 6470 if (Context.hasSameType(NewTy, OldTy) || 6471 NewTy->isDependentType() || OldTy->isDependentType()) 6472 return false; 6473 6474 // Check if the return types are covariant 6475 QualType NewClassTy, OldClassTy; 6476 6477 /// Both types must be pointers or references to classes. 6478 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6479 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6480 NewClassTy = NewPT->getPointeeType(); 6481 OldClassTy = OldPT->getPointeeType(); 6482 } 6483 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6484 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6485 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6486 NewClassTy = NewRT->getPointeeType(); 6487 OldClassTy = OldRT->getPointeeType(); 6488 } 6489 } 6490 } 6491 6492 // The return types aren't either both pointers or references to a class type. 6493 if (NewClassTy.isNull()) { 6494 Diag(New->getLocation(), 6495 diag::err_different_return_type_for_overriding_virtual_function) 6496 << New->getDeclName() << NewTy << OldTy; 6497 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6498 6499 return true; 6500 } 6501 6502 // C++ [class.virtual]p6: 6503 // If the return type of D::f differs from the return type of B::f, the 6504 // class type in the return type of D::f shall be complete at the point of 6505 // declaration of D::f or shall be the class type D. 6506 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6507 if (!RT->isBeingDefined() && 6508 RequireCompleteType(New->getLocation(), NewClassTy, 6509 PDiag(diag::err_covariant_return_incomplete) 6510 << New->getDeclName())) 6511 return true; 6512 } 6513 6514 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6515 // Check if the new class derives from the old class. 6516 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6517 Diag(New->getLocation(), 6518 diag::err_covariant_return_not_derived) 6519 << New->getDeclName() << NewTy << OldTy; 6520 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6521 return true; 6522 } 6523 6524 // Check if we the conversion from derived to base is valid. 6525 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6526 diag::err_covariant_return_inaccessible_base, 6527 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6528 // FIXME: Should this point to the return type? 6529 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6530 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6531 return true; 6532 } 6533 } 6534 6535 // The qualifiers of the return types must be the same. 6536 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6537 Diag(New->getLocation(), 6538 diag::err_covariant_return_type_different_qualifications) 6539 << New->getDeclName() << NewTy << OldTy; 6540 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6541 return true; 6542 }; 6543 6544 6545 // The new class type must have the same or less qualifiers as the old type. 6546 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6547 Diag(New->getLocation(), 6548 diag::err_covariant_return_type_class_type_more_qualified) 6549 << New->getDeclName() << NewTy << OldTy; 6550 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6551 return true; 6552 }; 6553 6554 return false; 6555} 6556 6557bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6558 const CXXMethodDecl *Old) 6559{ 6560 if (Old->hasAttr<FinalAttr>()) { 6561 Diag(New->getLocation(), diag::err_final_function_overridden) 6562 << New->getDeclName(); 6563 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6564 return true; 6565 } 6566 6567 return false; 6568} 6569 6570/// \brief Mark the given method pure. 6571/// 6572/// \param Method the method to be marked pure. 6573/// 6574/// \param InitRange the source range that covers the "0" initializer. 6575bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6576 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6577 Method->setPure(); 6578 6579 // A class is abstract if at least one function is pure virtual. 6580 Method->getParent()->setAbstract(true); 6581 return false; 6582 } 6583 6584 if (!Method->isInvalidDecl()) 6585 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6586 << Method->getDeclName() << InitRange; 6587 return true; 6588} 6589 6590/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6591/// an initializer for the out-of-line declaration 'Dcl'. The scope 6592/// is a fresh scope pushed for just this purpose. 6593/// 6594/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6595/// static data member of class X, names should be looked up in the scope of 6596/// class X. 6597void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6598 // If there is no declaration, there was an error parsing it. 6599 Decl *D = Dcl.getAs<Decl>(); 6600 if (D == 0) return; 6601 6602 // We should only get called for declarations with scope specifiers, like: 6603 // int foo::bar; 6604 assert(D->isOutOfLine()); 6605 EnterDeclaratorContext(S, D->getDeclContext()); 6606} 6607 6608/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6609/// initializer for the out-of-line declaration 'Dcl'. 6610void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6611 // If there is no declaration, there was an error parsing it. 6612 Decl *D = Dcl.getAs<Decl>(); 6613 if (D == 0) return; 6614 6615 assert(D->isOutOfLine()); 6616 ExitDeclaratorContext(S); 6617} 6618 6619/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6620/// C++ if/switch/while/for statement. 6621/// e.g: "if (int x = f()) {...}" 6622Action::DeclResult 6623Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6624 // C++ 6.4p2: 6625 // The declarator shall not specify a function or an array. 6626 // The type-specifier-seq shall not contain typedef and shall not declare a 6627 // new class or enumeration. 6628 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6629 "Parser allowed 'typedef' as storage class of condition decl."); 6630 6631 TagDecl *OwnedTag = 0; 6632 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6633 QualType Ty = TInfo->getType(); 6634 6635 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6636 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6637 // would be created and CXXConditionDeclExpr wants a VarDecl. 6638 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6639 << D.getSourceRange(); 6640 return DeclResult(); 6641 } else if (OwnedTag && OwnedTag->isDefinition()) { 6642 // The type-specifier-seq shall not declare a new class or enumeration. 6643 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6644 } 6645 6646 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6647 if (!Dcl) 6648 return DeclResult(); 6649 6650 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6651 VD->setDeclaredInCondition(true); 6652 return Dcl; 6653} 6654 6655void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6656 bool DefinitionRequired) { 6657 // Ignore any vtable uses in unevaluated operands or for classes that do 6658 // not have a vtable. 6659 if (!Class->isDynamicClass() || Class->isDependentContext() || 6660 CurContext->isDependentContext() || 6661 ExprEvalContexts.back().Context == Unevaluated) 6662 return; 6663 6664 // Try to insert this class into the map. 6665 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6666 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6667 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6668 if (!Pos.second) { 6669 // If we already had an entry, check to see if we are promoting this vtable 6670 // to required a definition. If so, we need to reappend to the VTableUses 6671 // list, since we may have already processed the first entry. 6672 if (DefinitionRequired && !Pos.first->second) { 6673 Pos.first->second = true; 6674 } else { 6675 // Otherwise, we can early exit. 6676 return; 6677 } 6678 } 6679 6680 // Local classes need to have their virtual members marked 6681 // immediately. For all other classes, we mark their virtual members 6682 // at the end of the translation unit. 6683 if (Class->isLocalClass()) 6684 MarkVirtualMembersReferenced(Loc, Class); 6685 else 6686 VTableUses.push_back(std::make_pair(Class, Loc)); 6687} 6688 6689bool Sema::DefineUsedVTables() { 6690 // If any dynamic classes have their key function defined within 6691 // this translation unit, then those vtables are considered "used" and must 6692 // be emitted. 6693 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6694 if (const CXXMethodDecl *KeyFunction 6695 = Context.getKeyFunction(DynamicClasses[I])) { 6696 const FunctionDecl *Definition = 0; 6697 if (KeyFunction->hasBody(Definition)) 6698 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6699 } 6700 } 6701 6702 if (VTableUses.empty()) 6703 return false; 6704 6705 // Note: The VTableUses vector could grow as a result of marking 6706 // the members of a class as "used", so we check the size each 6707 // time through the loop and prefer indices (with are stable) to 6708 // iterators (which are not). 6709 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6710 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6711 if (!Class) 6712 continue; 6713 6714 SourceLocation Loc = VTableUses[I].second; 6715 6716 // If this class has a key function, but that key function is 6717 // defined in another translation unit, we don't need to emit the 6718 // vtable even though we're using it. 6719 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6720 if (KeyFunction && !KeyFunction->hasBody()) { 6721 switch (KeyFunction->getTemplateSpecializationKind()) { 6722 case TSK_Undeclared: 6723 case TSK_ExplicitSpecialization: 6724 case TSK_ExplicitInstantiationDeclaration: 6725 // The key function is in another translation unit. 6726 continue; 6727 6728 case TSK_ExplicitInstantiationDefinition: 6729 case TSK_ImplicitInstantiation: 6730 // We will be instantiating the key function. 6731 break; 6732 } 6733 } else if (!KeyFunction) { 6734 // If we have a class with no key function that is the subject 6735 // of an explicit instantiation declaration, suppress the 6736 // vtable; it will live with the explicit instantiation 6737 // definition. 6738 bool IsExplicitInstantiationDeclaration 6739 = Class->getTemplateSpecializationKind() 6740 == TSK_ExplicitInstantiationDeclaration; 6741 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6742 REnd = Class->redecls_end(); 6743 R != REnd; ++R) { 6744 TemplateSpecializationKind TSK 6745 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6746 if (TSK == TSK_ExplicitInstantiationDeclaration) 6747 IsExplicitInstantiationDeclaration = true; 6748 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6749 IsExplicitInstantiationDeclaration = false; 6750 break; 6751 } 6752 } 6753 6754 if (IsExplicitInstantiationDeclaration) 6755 continue; 6756 } 6757 6758 // Mark all of the virtual members of this class as referenced, so 6759 // that we can build a vtable. Then, tell the AST consumer that a 6760 // vtable for this class is required. 6761 MarkVirtualMembersReferenced(Loc, Class); 6762 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6763 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6764 6765 // Optionally warn if we're emitting a weak vtable. 6766 if (Class->getLinkage() == ExternalLinkage && 6767 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6768 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6769 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6770 } 6771 } 6772 VTableUses.clear(); 6773 6774 return true; 6775} 6776 6777void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6778 const CXXRecordDecl *RD) { 6779 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6780 e = RD->method_end(); i != e; ++i) { 6781 CXXMethodDecl *MD = *i; 6782 6783 // C++ [basic.def.odr]p2: 6784 // [...] A virtual member function is used if it is not pure. [...] 6785 if (MD->isVirtual() && !MD->isPure()) 6786 MarkDeclarationReferenced(Loc, MD); 6787 } 6788 6789 // Only classes that have virtual bases need a VTT. 6790 if (RD->getNumVBases() == 0) 6791 return; 6792 6793 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6794 e = RD->bases_end(); i != e; ++i) { 6795 const CXXRecordDecl *Base = 6796 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6797 if (i->isVirtual()) 6798 continue; 6799 if (Base->getNumVBases() == 0) 6800 continue; 6801 MarkVirtualMembersReferenced(Loc, Base); 6802 } 6803} 6804 6805/// SetIvarInitializers - This routine builds initialization ASTs for the 6806/// Objective-C implementation whose ivars need be initialized. 6807void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6808 if (!getLangOptions().CPlusPlus) 6809 return; 6810 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6811 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6812 CollectIvarsToConstructOrDestruct(OID, ivars); 6813 if (ivars.empty()) 6814 return; 6815 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6816 for (unsigned i = 0; i < ivars.size(); i++) { 6817 FieldDecl *Field = ivars[i]; 6818 if (Field->isInvalidDecl()) 6819 continue; 6820 6821 CXXBaseOrMemberInitializer *Member; 6822 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6823 InitializationKind InitKind = 6824 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6825 6826 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6827 Sema::OwningExprResult MemberInit = 6828 InitSeq.Perform(*this, InitEntity, InitKind, 6829 Sema::MultiExprArg(*this, 0, 0)); 6830 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6831 // Note, MemberInit could actually come back empty if no initialization 6832 // is required (e.g., because it would call a trivial default constructor) 6833 if (!MemberInit.get() || MemberInit.isInvalid()) 6834 continue; 6835 6836 Member = 6837 new (Context) CXXBaseOrMemberInitializer(Context, 6838 Field, SourceLocation(), 6839 SourceLocation(), 6840 MemberInit.takeAs<Expr>(), 6841 SourceLocation()); 6842 AllToInit.push_back(Member); 6843 6844 // Be sure that the destructor is accessible and is marked as referenced. 6845 if (const RecordType *RecordTy 6846 = Context.getBaseElementType(Field->getType()) 6847 ->getAs<RecordType>()) { 6848 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6849 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6850 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6851 CheckDestructorAccess(Field->getLocation(), Destructor, 6852 PDiag(diag::err_access_dtor_ivar) 6853 << Context.getBaseElementType(Field->getType())); 6854 } 6855 } 6856 } 6857 ObjCImplementation->setIvarInitializers(Context, 6858 AllToInit.data(), AllToInit.size()); 6859 } 6860} 6861