SemaDeclCXX.cpp revision 58e5539df7d9d1f003912fccb8d524d4f2c6846a
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 (II) { 3183 // C++ [namespace.def]p2: 3184 // The identifier in an original-namespace-definition shall not have been 3185 // previously defined in the declarative region in which the 3186 // original-namespace-definition appears. The identifier in an 3187 // original-namespace-definition is the name of the namespace. Subsequently 3188 // in that declarative region, it is treated as an original-namespace-name. 3189 3190 NamedDecl *PrevDecl 3191 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3192 ForRedeclaration); 3193 3194 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3195 // This is an extended namespace definition. 3196 // Attach this namespace decl to the chain of extended namespace 3197 // definitions. 3198 OrigNS->setNextNamespace(Namespc); 3199 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3200 3201 // Remove the previous declaration from the scope. 3202 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3203 IdResolver.RemoveDecl(OrigNS); 3204 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3205 } 3206 } else if (PrevDecl) { 3207 // This is an invalid name redefinition. 3208 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3209 << Namespc->getDeclName(); 3210 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3211 Namespc->setInvalidDecl(); 3212 // Continue on to push Namespc as current DeclContext and return it. 3213 } else if (II->isStr("std") && 3214 CurContext->getLookupContext()->isTranslationUnit()) { 3215 // This is the first "real" definition of the namespace "std", so update 3216 // our cache of the "std" namespace to point at this definition. 3217 if (NamespaceDecl *StdNS = getStdNamespace()) { 3218 // We had already defined a dummy namespace "std". Link this new 3219 // namespace definition to the dummy namespace "std". 3220 StdNS->setNextNamespace(Namespc); 3221 StdNS->setLocation(IdentLoc); 3222 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3223 } 3224 3225 // Make our StdNamespace cache point at the first real definition of the 3226 // "std" namespace. 3227 StdNamespace = Namespc; 3228 } 3229 3230 PushOnScopeChains(Namespc, DeclRegionScope); 3231 } else { 3232 // Anonymous namespaces. 3233 assert(Namespc->isAnonymousNamespace()); 3234 3235 // Link the anonymous namespace into its parent. 3236 NamespaceDecl *PrevDecl; 3237 DeclContext *Parent = CurContext->getLookupContext(); 3238 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3239 PrevDecl = TU->getAnonymousNamespace(); 3240 TU->setAnonymousNamespace(Namespc); 3241 } else { 3242 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3243 PrevDecl = ND->getAnonymousNamespace(); 3244 ND->setAnonymousNamespace(Namespc); 3245 } 3246 3247 // Link the anonymous namespace with its previous declaration. 3248 if (PrevDecl) { 3249 assert(PrevDecl->isAnonymousNamespace()); 3250 assert(!PrevDecl->getNextNamespace()); 3251 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3252 PrevDecl->setNextNamespace(Namespc); 3253 } 3254 3255 CurContext->addDecl(Namespc); 3256 3257 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3258 // behaves as if it were replaced by 3259 // namespace unique { /* empty body */ } 3260 // using namespace unique; 3261 // namespace unique { namespace-body } 3262 // where all occurrences of 'unique' in a translation unit are 3263 // replaced by the same identifier and this identifier differs 3264 // from all other identifiers in the entire program. 3265 3266 // We just create the namespace with an empty name and then add an 3267 // implicit using declaration, just like the standard suggests. 3268 // 3269 // CodeGen enforces the "universally unique" aspect by giving all 3270 // declarations semantically contained within an anonymous 3271 // namespace internal linkage. 3272 3273 if (!PrevDecl) { 3274 UsingDirectiveDecl* UD 3275 = UsingDirectiveDecl::Create(Context, CurContext, 3276 /* 'using' */ LBrace, 3277 /* 'namespace' */ SourceLocation(), 3278 /* qualifier */ SourceRange(), 3279 /* NNS */ NULL, 3280 /* identifier */ SourceLocation(), 3281 Namespc, 3282 /* Ancestor */ CurContext); 3283 UD->setImplicit(); 3284 CurContext->addDecl(UD); 3285 } 3286 } 3287 3288 // Although we could have an invalid decl (i.e. the namespace name is a 3289 // redefinition), push it as current DeclContext and try to continue parsing. 3290 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3291 // for the namespace has the declarations that showed up in that particular 3292 // namespace definition. 3293 PushDeclContext(NamespcScope, Namespc); 3294 return DeclPtrTy::make(Namespc); 3295} 3296 3297/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3298/// is a namespace alias, returns the namespace it points to. 3299static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3300 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3301 return AD->getNamespace(); 3302 return dyn_cast_or_null<NamespaceDecl>(D); 3303} 3304 3305/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3306/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3307void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3308 Decl *Dcl = D.getAs<Decl>(); 3309 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3310 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3311 Namespc->setRBracLoc(RBrace); 3312 PopDeclContext(); 3313} 3314 3315/// \brief Retrieve the special "std" namespace, which may require us to 3316/// implicitly define the namespace. 3317NamespaceDecl *Sema::getOrCreateStdNamespace() { 3318 if (!StdNamespace) { 3319 // The "std" namespace has not yet been defined, so build one implicitly. 3320 StdNamespace = NamespaceDecl::Create(Context, 3321 Context.getTranslationUnitDecl(), 3322 SourceLocation(), 3323 &PP.getIdentifierTable().get("std")); 3324 getStdNamespace()->setImplicit(true); 3325 } 3326 3327 return getStdNamespace(); 3328} 3329 3330Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3331 SourceLocation UsingLoc, 3332 SourceLocation NamespcLoc, 3333 CXXScopeSpec &SS, 3334 SourceLocation IdentLoc, 3335 IdentifierInfo *NamespcName, 3336 AttributeList *AttrList) { 3337 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3338 assert(NamespcName && "Invalid NamespcName."); 3339 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3340 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3341 3342 UsingDirectiveDecl *UDir = 0; 3343 NestedNameSpecifier *Qualifier = 0; 3344 if (SS.isSet()) 3345 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3346 3347 // Lookup namespace name. 3348 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3349 LookupParsedName(R, S, &SS); 3350 if (R.isAmbiguous()) 3351 return DeclPtrTy(); 3352 3353 if (R.empty()) { 3354 // Allow "using namespace std;" or "using namespace ::std;" even if 3355 // "std" hasn't been defined yet, for GCC compatibility. 3356 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3357 NamespcName->isStr("std")) { 3358 Diag(IdentLoc, diag::ext_using_undefined_std); 3359 R.addDecl(getOrCreateStdNamespace()); 3360 R.resolveKind(); 3361 } 3362 // Otherwise, attempt typo correction. 3363 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3364 CTC_NoKeywords, 0)) { 3365 if (R.getAsSingle<NamespaceDecl>() || 3366 R.getAsSingle<NamespaceAliasDecl>()) { 3367 if (DeclContext *DC = computeDeclContext(SS, false)) 3368 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3369 << NamespcName << DC << Corrected << SS.getRange() 3370 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3371 else 3372 Diag(IdentLoc, diag::err_using_directive_suggest) 3373 << NamespcName << Corrected 3374 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3375 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3376 << Corrected; 3377 3378 NamespcName = Corrected.getAsIdentifierInfo(); 3379 } else { 3380 R.clear(); 3381 R.setLookupName(NamespcName); 3382 } 3383 } 3384 } 3385 3386 if (!R.empty()) { 3387 NamedDecl *Named = R.getFoundDecl(); 3388 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3389 && "expected namespace decl"); 3390 // C++ [namespace.udir]p1: 3391 // A using-directive specifies that the names in the nominated 3392 // namespace can be used in the scope in which the 3393 // using-directive appears after the using-directive. During 3394 // unqualified name lookup (3.4.1), the names appear as if they 3395 // were declared in the nearest enclosing namespace which 3396 // contains both the using-directive and the nominated 3397 // namespace. [Note: in this context, "contains" means "contains 3398 // directly or indirectly". ] 3399 3400 // Find enclosing context containing both using-directive and 3401 // nominated namespace. 3402 NamespaceDecl *NS = getNamespaceDecl(Named); 3403 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3404 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3405 CommonAncestor = CommonAncestor->getParent(); 3406 3407 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3408 SS.getRange(), 3409 (NestedNameSpecifier *)SS.getScopeRep(), 3410 IdentLoc, Named, CommonAncestor); 3411 PushUsingDirective(S, UDir); 3412 } else { 3413 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3414 } 3415 3416 // FIXME: We ignore attributes for now. 3417 delete AttrList; 3418 return DeclPtrTy::make(UDir); 3419} 3420 3421void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3422 // If scope has associated entity, then using directive is at namespace 3423 // or translation unit scope. We add UsingDirectiveDecls, into 3424 // it's lookup structure. 3425 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3426 Ctx->addDecl(UDir); 3427 else 3428 // Otherwise it is block-sope. using-directives will affect lookup 3429 // only to the end of scope. 3430 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3431} 3432 3433 3434Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3435 AccessSpecifier AS, 3436 bool HasUsingKeyword, 3437 SourceLocation UsingLoc, 3438 CXXScopeSpec &SS, 3439 UnqualifiedId &Name, 3440 AttributeList *AttrList, 3441 bool IsTypeName, 3442 SourceLocation TypenameLoc) { 3443 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3444 3445 switch (Name.getKind()) { 3446 case UnqualifiedId::IK_Identifier: 3447 case UnqualifiedId::IK_OperatorFunctionId: 3448 case UnqualifiedId::IK_LiteralOperatorId: 3449 case UnqualifiedId::IK_ConversionFunctionId: 3450 break; 3451 3452 case UnqualifiedId::IK_ConstructorName: 3453 case UnqualifiedId::IK_ConstructorTemplateId: 3454 // C++0x inherited constructors. 3455 if (getLangOptions().CPlusPlus0x) break; 3456 3457 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3458 << SS.getRange(); 3459 return DeclPtrTy(); 3460 3461 case UnqualifiedId::IK_DestructorName: 3462 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3463 << SS.getRange(); 3464 return DeclPtrTy(); 3465 3466 case UnqualifiedId::IK_TemplateId: 3467 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3468 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3469 return DeclPtrTy(); 3470 } 3471 3472 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3473 if (!TargetName) 3474 return DeclPtrTy(); 3475 3476 // Warn about using declarations. 3477 // TODO: store that the declaration was written without 'using' and 3478 // talk about access decls instead of using decls in the 3479 // diagnostics. 3480 if (!HasUsingKeyword) { 3481 UsingLoc = Name.getSourceRange().getBegin(); 3482 3483 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3484 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3485 } 3486 3487 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3488 Name.getSourceRange().getBegin(), 3489 TargetName, AttrList, 3490 /* IsInstantiation */ false, 3491 IsTypeName, TypenameLoc); 3492 if (UD) 3493 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3494 3495 return DeclPtrTy::make(UD); 3496} 3497 3498/// \brief Determine whether a using declaration considers the given 3499/// declarations as "equivalent", e.g., if they are redeclarations of 3500/// the same entity or are both typedefs of the same type. 3501static bool 3502IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3503 bool &SuppressRedeclaration) { 3504 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3505 SuppressRedeclaration = false; 3506 return true; 3507 } 3508 3509 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3510 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3511 SuppressRedeclaration = true; 3512 return Context.hasSameType(TD1->getUnderlyingType(), 3513 TD2->getUnderlyingType()); 3514 } 3515 3516 return false; 3517} 3518 3519 3520/// Determines whether to create a using shadow decl for a particular 3521/// decl, given the set of decls existing prior to this using lookup. 3522bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3523 const LookupResult &Previous) { 3524 // Diagnose finding a decl which is not from a base class of the 3525 // current class. We do this now because there are cases where this 3526 // function will silently decide not to build a shadow decl, which 3527 // will pre-empt further diagnostics. 3528 // 3529 // We don't need to do this in C++0x because we do the check once on 3530 // the qualifier. 3531 // 3532 // FIXME: diagnose the following if we care enough: 3533 // struct A { int foo; }; 3534 // struct B : A { using A::foo; }; 3535 // template <class T> struct C : A {}; 3536 // template <class T> struct D : C<T> { using B::foo; } // <--- 3537 // This is invalid (during instantiation) in C++03 because B::foo 3538 // resolves to the using decl in B, which is not a base class of D<T>. 3539 // We can't diagnose it immediately because C<T> is an unknown 3540 // specialization. The UsingShadowDecl in D<T> then points directly 3541 // to A::foo, which will look well-formed when we instantiate. 3542 // The right solution is to not collapse the shadow-decl chain. 3543 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3544 DeclContext *OrigDC = Orig->getDeclContext(); 3545 3546 // Handle enums and anonymous structs. 3547 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3548 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3549 while (OrigRec->isAnonymousStructOrUnion()) 3550 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3551 3552 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3553 if (OrigDC == CurContext) { 3554 Diag(Using->getLocation(), 3555 diag::err_using_decl_nested_name_specifier_is_current_class) 3556 << Using->getNestedNameRange(); 3557 Diag(Orig->getLocation(), diag::note_using_decl_target); 3558 return true; 3559 } 3560 3561 Diag(Using->getNestedNameRange().getBegin(), 3562 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3563 << Using->getTargetNestedNameDecl() 3564 << cast<CXXRecordDecl>(CurContext) 3565 << Using->getNestedNameRange(); 3566 Diag(Orig->getLocation(), diag::note_using_decl_target); 3567 return true; 3568 } 3569 } 3570 3571 if (Previous.empty()) return false; 3572 3573 NamedDecl *Target = Orig; 3574 if (isa<UsingShadowDecl>(Target)) 3575 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3576 3577 // If the target happens to be one of the previous declarations, we 3578 // don't have a conflict. 3579 // 3580 // FIXME: but we might be increasing its access, in which case we 3581 // should redeclare it. 3582 NamedDecl *NonTag = 0, *Tag = 0; 3583 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3584 I != E; ++I) { 3585 NamedDecl *D = (*I)->getUnderlyingDecl(); 3586 bool Result; 3587 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3588 return Result; 3589 3590 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3591 } 3592 3593 if (Target->isFunctionOrFunctionTemplate()) { 3594 FunctionDecl *FD; 3595 if (isa<FunctionTemplateDecl>(Target)) 3596 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3597 else 3598 FD = cast<FunctionDecl>(Target); 3599 3600 NamedDecl *OldDecl = 0; 3601 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3602 case Ovl_Overload: 3603 return false; 3604 3605 case Ovl_NonFunction: 3606 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3607 break; 3608 3609 // We found a decl with the exact signature. 3610 case Ovl_Match: 3611 // If we're in a record, we want to hide the target, so we 3612 // return true (without a diagnostic) to tell the caller not to 3613 // build a shadow decl. 3614 if (CurContext->isRecord()) 3615 return true; 3616 3617 // If we're not in a record, this is an error. 3618 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3619 break; 3620 } 3621 3622 Diag(Target->getLocation(), diag::note_using_decl_target); 3623 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3624 return true; 3625 } 3626 3627 // Target is not a function. 3628 3629 if (isa<TagDecl>(Target)) { 3630 // No conflict between a tag and a non-tag. 3631 if (!Tag) return false; 3632 3633 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3634 Diag(Target->getLocation(), diag::note_using_decl_target); 3635 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3636 return true; 3637 } 3638 3639 // No conflict between a tag and a non-tag. 3640 if (!NonTag) return false; 3641 3642 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3643 Diag(Target->getLocation(), diag::note_using_decl_target); 3644 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3645 return true; 3646} 3647 3648/// Builds a shadow declaration corresponding to a 'using' declaration. 3649UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3650 UsingDecl *UD, 3651 NamedDecl *Orig) { 3652 3653 // If we resolved to another shadow declaration, just coalesce them. 3654 NamedDecl *Target = Orig; 3655 if (isa<UsingShadowDecl>(Target)) { 3656 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3657 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3658 } 3659 3660 UsingShadowDecl *Shadow 3661 = UsingShadowDecl::Create(Context, CurContext, 3662 UD->getLocation(), UD, Target); 3663 UD->addShadowDecl(Shadow); 3664 3665 if (S) 3666 PushOnScopeChains(Shadow, S); 3667 else 3668 CurContext->addDecl(Shadow); 3669 Shadow->setAccess(UD->getAccess()); 3670 3671 // Register it as a conversion if appropriate. 3672 if (Shadow->getDeclName().getNameKind() 3673 == DeclarationName::CXXConversionFunctionName) 3674 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3675 3676 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3677 Shadow->setInvalidDecl(); 3678 3679 return Shadow; 3680} 3681 3682/// Hides a using shadow declaration. This is required by the current 3683/// using-decl implementation when a resolvable using declaration in a 3684/// class is followed by a declaration which would hide or override 3685/// one or more of the using decl's targets; for example: 3686/// 3687/// struct Base { void foo(int); }; 3688/// struct Derived : Base { 3689/// using Base::foo; 3690/// void foo(int); 3691/// }; 3692/// 3693/// The governing language is C++03 [namespace.udecl]p12: 3694/// 3695/// When a using-declaration brings names from a base class into a 3696/// derived class scope, member functions in the derived class 3697/// override and/or hide member functions with the same name and 3698/// parameter types in a base class (rather than conflicting). 3699/// 3700/// There are two ways to implement this: 3701/// (1) optimistically create shadow decls when they're not hidden 3702/// by existing declarations, or 3703/// (2) don't create any shadow decls (or at least don't make them 3704/// visible) until we've fully parsed/instantiated the class. 3705/// The problem with (1) is that we might have to retroactively remove 3706/// a shadow decl, which requires several O(n) operations because the 3707/// decl structures are (very reasonably) not designed for removal. 3708/// (2) avoids this but is very fiddly and phase-dependent. 3709void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3710 if (Shadow->getDeclName().getNameKind() == 3711 DeclarationName::CXXConversionFunctionName) 3712 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3713 3714 // Remove it from the DeclContext... 3715 Shadow->getDeclContext()->removeDecl(Shadow); 3716 3717 // ...and the scope, if applicable... 3718 if (S) { 3719 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3720 IdResolver.RemoveDecl(Shadow); 3721 } 3722 3723 // ...and the using decl. 3724 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3725 3726 // TODO: complain somehow if Shadow was used. It shouldn't 3727 // be possible for this to happen, because...? 3728} 3729 3730/// Builds a using declaration. 3731/// 3732/// \param IsInstantiation - Whether this call arises from an 3733/// instantiation of an unresolved using declaration. We treat 3734/// the lookup differently for these declarations. 3735NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3736 SourceLocation UsingLoc, 3737 CXXScopeSpec &SS, 3738 SourceLocation IdentLoc, 3739 DeclarationName Name, 3740 AttributeList *AttrList, 3741 bool IsInstantiation, 3742 bool IsTypeName, 3743 SourceLocation TypenameLoc) { 3744 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3745 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3746 3747 // FIXME: We ignore attributes for now. 3748 delete AttrList; 3749 3750 if (SS.isEmpty()) { 3751 Diag(IdentLoc, diag::err_using_requires_qualname); 3752 return 0; 3753 } 3754 3755 // Do the redeclaration lookup in the current scope. 3756 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3757 ForRedeclaration); 3758 Previous.setHideTags(false); 3759 if (S) { 3760 LookupName(Previous, S); 3761 3762 // It is really dumb that we have to do this. 3763 LookupResult::Filter F = Previous.makeFilter(); 3764 while (F.hasNext()) { 3765 NamedDecl *D = F.next(); 3766 if (!isDeclInScope(D, CurContext, S)) 3767 F.erase(); 3768 } 3769 F.done(); 3770 } else { 3771 assert(IsInstantiation && "no scope in non-instantiation"); 3772 assert(CurContext->isRecord() && "scope not record in instantiation"); 3773 LookupQualifiedName(Previous, CurContext); 3774 } 3775 3776 NestedNameSpecifier *NNS = 3777 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3778 3779 // Check for invalid redeclarations. 3780 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3781 return 0; 3782 3783 // Check for bad qualifiers. 3784 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3785 return 0; 3786 3787 DeclContext *LookupContext = computeDeclContext(SS); 3788 NamedDecl *D; 3789 if (!LookupContext) { 3790 if (IsTypeName) { 3791 // FIXME: not all declaration name kinds are legal here 3792 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3793 UsingLoc, TypenameLoc, 3794 SS.getRange(), NNS, 3795 IdentLoc, Name); 3796 } else { 3797 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3798 UsingLoc, SS.getRange(), NNS, 3799 IdentLoc, Name); 3800 } 3801 } else { 3802 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3803 SS.getRange(), UsingLoc, NNS, Name, 3804 IsTypeName); 3805 } 3806 D->setAccess(AS); 3807 CurContext->addDecl(D); 3808 3809 if (!LookupContext) return D; 3810 UsingDecl *UD = cast<UsingDecl>(D); 3811 3812 if (RequireCompleteDeclContext(SS, LookupContext)) { 3813 UD->setInvalidDecl(); 3814 return UD; 3815 } 3816 3817 // Look up the target name. 3818 3819 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3820 3821 // Unlike most lookups, we don't always want to hide tag 3822 // declarations: tag names are visible through the using declaration 3823 // even if hidden by ordinary names, *except* in a dependent context 3824 // where it's important for the sanity of two-phase lookup. 3825 if (!IsInstantiation) 3826 R.setHideTags(false); 3827 3828 LookupQualifiedName(R, LookupContext); 3829 3830 if (R.empty()) { 3831 Diag(IdentLoc, diag::err_no_member) 3832 << Name << LookupContext << SS.getRange(); 3833 UD->setInvalidDecl(); 3834 return UD; 3835 } 3836 3837 if (R.isAmbiguous()) { 3838 UD->setInvalidDecl(); 3839 return UD; 3840 } 3841 3842 if (IsTypeName) { 3843 // If we asked for a typename and got a non-type decl, error out. 3844 if (!R.getAsSingle<TypeDecl>()) { 3845 Diag(IdentLoc, diag::err_using_typename_non_type); 3846 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3847 Diag((*I)->getUnderlyingDecl()->getLocation(), 3848 diag::note_using_decl_target); 3849 UD->setInvalidDecl(); 3850 return UD; 3851 } 3852 } else { 3853 // If we asked for a non-typename and we got a type, error out, 3854 // but only if this is an instantiation of an unresolved using 3855 // decl. Otherwise just silently find the type name. 3856 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3857 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3858 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3859 UD->setInvalidDecl(); 3860 return UD; 3861 } 3862 } 3863 3864 // C++0x N2914 [namespace.udecl]p6: 3865 // A using-declaration shall not name a namespace. 3866 if (R.getAsSingle<NamespaceDecl>()) { 3867 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3868 << SS.getRange(); 3869 UD->setInvalidDecl(); 3870 return UD; 3871 } 3872 3873 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3874 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3875 BuildUsingShadowDecl(S, UD, *I); 3876 } 3877 3878 return UD; 3879} 3880 3881/// Checks that the given using declaration is not an invalid 3882/// redeclaration. Note that this is checking only for the using decl 3883/// itself, not for any ill-formedness among the UsingShadowDecls. 3884bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3885 bool isTypeName, 3886 const CXXScopeSpec &SS, 3887 SourceLocation NameLoc, 3888 const LookupResult &Prev) { 3889 // C++03 [namespace.udecl]p8: 3890 // C++0x [namespace.udecl]p10: 3891 // A using-declaration is a declaration and can therefore be used 3892 // repeatedly where (and only where) multiple declarations are 3893 // allowed. 3894 // 3895 // That's in non-member contexts. 3896 if (!CurContext->getLookupContext()->isRecord()) 3897 return false; 3898 3899 NestedNameSpecifier *Qual 3900 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3901 3902 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3903 NamedDecl *D = *I; 3904 3905 bool DTypename; 3906 NestedNameSpecifier *DQual; 3907 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3908 DTypename = UD->isTypeName(); 3909 DQual = UD->getTargetNestedNameDecl(); 3910 } else if (UnresolvedUsingValueDecl *UD 3911 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3912 DTypename = false; 3913 DQual = UD->getTargetNestedNameSpecifier(); 3914 } else if (UnresolvedUsingTypenameDecl *UD 3915 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3916 DTypename = true; 3917 DQual = UD->getTargetNestedNameSpecifier(); 3918 } else continue; 3919 3920 // using decls differ if one says 'typename' and the other doesn't. 3921 // FIXME: non-dependent using decls? 3922 if (isTypeName != DTypename) continue; 3923 3924 // using decls differ if they name different scopes (but note that 3925 // template instantiation can cause this check to trigger when it 3926 // didn't before instantiation). 3927 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3928 Context.getCanonicalNestedNameSpecifier(DQual)) 3929 continue; 3930 3931 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3932 Diag(D->getLocation(), diag::note_using_decl) << 1; 3933 return true; 3934 } 3935 3936 return false; 3937} 3938 3939 3940/// Checks that the given nested-name qualifier used in a using decl 3941/// in the current context is appropriately related to the current 3942/// scope. If an error is found, diagnoses it and returns true. 3943bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3944 const CXXScopeSpec &SS, 3945 SourceLocation NameLoc) { 3946 DeclContext *NamedContext = computeDeclContext(SS); 3947 3948 if (!CurContext->isRecord()) { 3949 // C++03 [namespace.udecl]p3: 3950 // C++0x [namespace.udecl]p8: 3951 // A using-declaration for a class member shall be a member-declaration. 3952 3953 // If we weren't able to compute a valid scope, it must be a 3954 // dependent class scope. 3955 if (!NamedContext || NamedContext->isRecord()) { 3956 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3957 << SS.getRange(); 3958 return true; 3959 } 3960 3961 // Otherwise, everything is known to be fine. 3962 return false; 3963 } 3964 3965 // The current scope is a record. 3966 3967 // If the named context is dependent, we can't decide much. 3968 if (!NamedContext) { 3969 // FIXME: in C++0x, we can diagnose if we can prove that the 3970 // nested-name-specifier does not refer to a base class, which is 3971 // still possible in some cases. 3972 3973 // Otherwise we have to conservatively report that things might be 3974 // okay. 3975 return false; 3976 } 3977 3978 if (!NamedContext->isRecord()) { 3979 // Ideally this would point at the last name in the specifier, 3980 // but we don't have that level of source info. 3981 Diag(SS.getRange().getBegin(), 3982 diag::err_using_decl_nested_name_specifier_is_not_class) 3983 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3984 return true; 3985 } 3986 3987 if (getLangOptions().CPlusPlus0x) { 3988 // C++0x [namespace.udecl]p3: 3989 // In a using-declaration used as a member-declaration, the 3990 // nested-name-specifier shall name a base class of the class 3991 // being defined. 3992 3993 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3994 cast<CXXRecordDecl>(NamedContext))) { 3995 if (CurContext == NamedContext) { 3996 Diag(NameLoc, 3997 diag::err_using_decl_nested_name_specifier_is_current_class) 3998 << SS.getRange(); 3999 return true; 4000 } 4001 4002 Diag(SS.getRange().getBegin(), 4003 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4004 << (NestedNameSpecifier*) SS.getScopeRep() 4005 << cast<CXXRecordDecl>(CurContext) 4006 << SS.getRange(); 4007 return true; 4008 } 4009 4010 return false; 4011 } 4012 4013 // C++03 [namespace.udecl]p4: 4014 // A using-declaration used as a member-declaration shall refer 4015 // to a member of a base class of the class being defined [etc.]. 4016 4017 // Salient point: SS doesn't have to name a base class as long as 4018 // lookup only finds members from base classes. Therefore we can 4019 // diagnose here only if we can prove that that can't happen, 4020 // i.e. if the class hierarchies provably don't intersect. 4021 4022 // TODO: it would be nice if "definitely valid" results were cached 4023 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4024 // need to be repeated. 4025 4026 struct UserData { 4027 llvm::DenseSet<const CXXRecordDecl*> Bases; 4028 4029 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4030 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4031 Data->Bases.insert(Base); 4032 return true; 4033 } 4034 4035 bool hasDependentBases(const CXXRecordDecl *Class) { 4036 return !Class->forallBases(collect, this); 4037 } 4038 4039 /// Returns true if the base is dependent or is one of the 4040 /// accumulated base classes. 4041 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4042 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4043 return !Data->Bases.count(Base); 4044 } 4045 4046 bool mightShareBases(const CXXRecordDecl *Class) { 4047 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4048 } 4049 }; 4050 4051 UserData Data; 4052 4053 // Returns false if we find a dependent base. 4054 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4055 return false; 4056 4057 // Returns false if the class has a dependent base or if it or one 4058 // of its bases is present in the base set of the current context. 4059 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4060 return false; 4061 4062 Diag(SS.getRange().getBegin(), 4063 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4064 << (NestedNameSpecifier*) SS.getScopeRep() 4065 << cast<CXXRecordDecl>(CurContext) 4066 << SS.getRange(); 4067 4068 return true; 4069} 4070 4071Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4072 SourceLocation NamespaceLoc, 4073 SourceLocation AliasLoc, 4074 IdentifierInfo *Alias, 4075 CXXScopeSpec &SS, 4076 SourceLocation IdentLoc, 4077 IdentifierInfo *Ident) { 4078 4079 // Lookup the namespace name. 4080 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4081 LookupParsedName(R, S, &SS); 4082 4083 // Check if we have a previous declaration with the same name. 4084 NamedDecl *PrevDecl 4085 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4086 ForRedeclaration); 4087 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4088 PrevDecl = 0; 4089 4090 if (PrevDecl) { 4091 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4092 // We already have an alias with the same name that points to the same 4093 // namespace, so don't create a new one. 4094 // FIXME: At some point, we'll want to create the (redundant) 4095 // declaration to maintain better source information. 4096 if (!R.isAmbiguous() && !R.empty() && 4097 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4098 return DeclPtrTy(); 4099 } 4100 4101 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4102 diag::err_redefinition_different_kind; 4103 Diag(AliasLoc, DiagID) << Alias; 4104 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4105 return DeclPtrTy(); 4106 } 4107 4108 if (R.isAmbiguous()) 4109 return DeclPtrTy(); 4110 4111 if (R.empty()) { 4112 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4113 CTC_NoKeywords, 0)) { 4114 if (R.getAsSingle<NamespaceDecl>() || 4115 R.getAsSingle<NamespaceAliasDecl>()) { 4116 if (DeclContext *DC = computeDeclContext(SS, false)) 4117 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4118 << Ident << DC << Corrected << SS.getRange() 4119 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4120 else 4121 Diag(IdentLoc, diag::err_using_directive_suggest) 4122 << Ident << Corrected 4123 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4124 4125 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4126 << Corrected; 4127 4128 Ident = Corrected.getAsIdentifierInfo(); 4129 } else { 4130 R.clear(); 4131 R.setLookupName(Ident); 4132 } 4133 } 4134 4135 if (R.empty()) { 4136 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4137 return DeclPtrTy(); 4138 } 4139 } 4140 4141 NamespaceAliasDecl *AliasDecl = 4142 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4143 Alias, SS.getRange(), 4144 (NestedNameSpecifier *)SS.getScopeRep(), 4145 IdentLoc, R.getFoundDecl()); 4146 4147 PushOnScopeChains(AliasDecl, S); 4148 return DeclPtrTy::make(AliasDecl); 4149} 4150 4151namespace { 4152 /// \brief Scoped object used to handle the state changes required in Sema 4153 /// to implicitly define the body of a C++ member function; 4154 class ImplicitlyDefinedFunctionScope { 4155 Sema &S; 4156 DeclContext *PreviousContext; 4157 4158 public: 4159 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4160 : S(S), PreviousContext(S.CurContext) 4161 { 4162 S.CurContext = Method; 4163 S.PushFunctionScope(); 4164 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4165 } 4166 4167 ~ImplicitlyDefinedFunctionScope() { 4168 S.PopExpressionEvaluationContext(); 4169 S.PopFunctionOrBlockScope(); 4170 S.CurContext = PreviousContext; 4171 } 4172 }; 4173} 4174 4175CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4176 CXXRecordDecl *ClassDecl) { 4177 // C++ [class.ctor]p5: 4178 // A default constructor for a class X is a constructor of class X 4179 // that can be called without an argument. If there is no 4180 // user-declared constructor for class X, a default constructor is 4181 // implicitly declared. An implicitly-declared default constructor 4182 // is an inline public member of its class. 4183 assert(!ClassDecl->hasUserDeclaredConstructor() && 4184 "Should not build implicit default constructor!"); 4185 4186 // C++ [except.spec]p14: 4187 // An implicitly declared special member function (Clause 12) shall have an 4188 // exception-specification. [...] 4189 ImplicitExceptionSpecification ExceptSpec(Context); 4190 4191 // Direct base-class destructors. 4192 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4193 BEnd = ClassDecl->bases_end(); 4194 B != BEnd; ++B) { 4195 if (B->isVirtual()) // Handled below. 4196 continue; 4197 4198 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4199 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4200 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4201 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4202 else if (CXXConstructorDecl *Constructor 4203 = BaseClassDecl->getDefaultConstructor()) 4204 ExceptSpec.CalledDecl(Constructor); 4205 } 4206 } 4207 4208 // Virtual base-class destructors. 4209 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4210 BEnd = ClassDecl->vbases_end(); 4211 B != BEnd; ++B) { 4212 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4213 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4214 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4215 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4216 else if (CXXConstructorDecl *Constructor 4217 = BaseClassDecl->getDefaultConstructor()) 4218 ExceptSpec.CalledDecl(Constructor); 4219 } 4220 } 4221 4222 // Field destructors. 4223 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4224 FEnd = ClassDecl->field_end(); 4225 F != FEnd; ++F) { 4226 if (const RecordType *RecordTy 4227 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4228 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4229 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4230 ExceptSpec.CalledDecl( 4231 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4232 else if (CXXConstructorDecl *Constructor 4233 = FieldClassDecl->getDefaultConstructor()) 4234 ExceptSpec.CalledDecl(Constructor); 4235 } 4236 } 4237 4238 4239 // Create the actual constructor declaration. 4240 CanQualType ClassType 4241 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4242 DeclarationName Name 4243 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4244 CXXConstructorDecl *DefaultCon 4245 = CXXConstructorDecl::Create(Context, ClassDecl, 4246 ClassDecl->getLocation(), Name, 4247 Context.getFunctionType(Context.VoidTy, 4248 0, 0, false, 0, 4249 ExceptSpec.hasExceptionSpecification(), 4250 ExceptSpec.hasAnyExceptionSpecification(), 4251 ExceptSpec.size(), 4252 ExceptSpec.data(), 4253 FunctionType::ExtInfo()), 4254 /*TInfo=*/0, 4255 /*isExplicit=*/false, 4256 /*isInline=*/true, 4257 /*isImplicitlyDeclared=*/true); 4258 DefaultCon->setAccess(AS_public); 4259 DefaultCon->setImplicit(); 4260 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4261 4262 // Note that we have declared this constructor. 4263 ClassDecl->setDeclaredDefaultConstructor(true); 4264 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4265 4266 if (Scope *S = getScopeForContext(ClassDecl)) 4267 PushOnScopeChains(DefaultCon, S, false); 4268 ClassDecl->addDecl(DefaultCon); 4269 4270 return DefaultCon; 4271} 4272 4273void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4274 CXXConstructorDecl *Constructor) { 4275 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4276 !Constructor->isUsed(false)) && 4277 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4278 4279 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4280 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4281 4282 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4283 ErrorTrap Trap(*this); 4284 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4285 Trap.hasErrorOccurred()) { 4286 Diag(CurrentLocation, diag::note_member_synthesized_at) 4287 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4288 Constructor->setInvalidDecl(); 4289 } else { 4290 Constructor->setUsed(); 4291 MarkVTableUsed(CurrentLocation, ClassDecl); 4292 } 4293} 4294 4295CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4296 // C++ [class.dtor]p2: 4297 // If a class has no user-declared destructor, a destructor is 4298 // declared implicitly. An implicitly-declared destructor is an 4299 // inline public member of its class. 4300 4301 // C++ [except.spec]p14: 4302 // An implicitly declared special member function (Clause 12) shall have 4303 // an exception-specification. 4304 ImplicitExceptionSpecification ExceptSpec(Context); 4305 4306 // Direct base-class destructors. 4307 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4308 BEnd = ClassDecl->bases_end(); 4309 B != BEnd; ++B) { 4310 if (B->isVirtual()) // Handled below. 4311 continue; 4312 4313 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4314 ExceptSpec.CalledDecl( 4315 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4316 } 4317 4318 // Virtual base-class destructors. 4319 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4320 BEnd = ClassDecl->vbases_end(); 4321 B != BEnd; ++B) { 4322 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4323 ExceptSpec.CalledDecl( 4324 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4325 } 4326 4327 // Field destructors. 4328 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4329 FEnd = ClassDecl->field_end(); 4330 F != FEnd; ++F) { 4331 if (const RecordType *RecordTy 4332 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4333 ExceptSpec.CalledDecl( 4334 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4335 } 4336 4337 // Create the actual destructor declaration. 4338 QualType Ty = Context.getFunctionType(Context.VoidTy, 4339 0, 0, false, 0, 4340 ExceptSpec.hasExceptionSpecification(), 4341 ExceptSpec.hasAnyExceptionSpecification(), 4342 ExceptSpec.size(), 4343 ExceptSpec.data(), 4344 FunctionType::ExtInfo()); 4345 4346 CanQualType ClassType 4347 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4348 DeclarationName Name 4349 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4350 CXXDestructorDecl *Destructor 4351 = CXXDestructorDecl::Create(Context, ClassDecl, 4352 ClassDecl->getLocation(), Name, Ty, 4353 /*isInline=*/true, 4354 /*isImplicitlyDeclared=*/true); 4355 Destructor->setAccess(AS_public); 4356 Destructor->setImplicit(); 4357 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4358 4359 // Note that we have declared this destructor. 4360 ClassDecl->setDeclaredDestructor(true); 4361 ++ASTContext::NumImplicitDestructorsDeclared; 4362 4363 // Introduce this destructor into its scope. 4364 if (Scope *S = getScopeForContext(ClassDecl)) 4365 PushOnScopeChains(Destructor, S, false); 4366 ClassDecl->addDecl(Destructor); 4367 4368 // This could be uniqued if it ever proves significant. 4369 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4370 4371 AddOverriddenMethods(ClassDecl, Destructor); 4372 4373 return Destructor; 4374} 4375 4376void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4377 CXXDestructorDecl *Destructor) { 4378 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4379 "DefineImplicitDestructor - call it for implicit default dtor"); 4380 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4381 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4382 4383 if (Destructor->isInvalidDecl()) 4384 return; 4385 4386 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4387 4388 ErrorTrap Trap(*this); 4389 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4390 Destructor->getParent()); 4391 4392 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4393 Diag(CurrentLocation, diag::note_member_synthesized_at) 4394 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4395 4396 Destructor->setInvalidDecl(); 4397 return; 4398 } 4399 4400 Destructor->setUsed(); 4401 MarkVTableUsed(CurrentLocation, ClassDecl); 4402} 4403 4404/// \brief Builds a statement that copies the given entity from \p From to 4405/// \c To. 4406/// 4407/// This routine is used to copy the members of a class with an 4408/// implicitly-declared copy assignment operator. When the entities being 4409/// copied are arrays, this routine builds for loops to copy them. 4410/// 4411/// \param S The Sema object used for type-checking. 4412/// 4413/// \param Loc The location where the implicit copy is being generated. 4414/// 4415/// \param T The type of the expressions being copied. Both expressions must 4416/// have this type. 4417/// 4418/// \param To The expression we are copying to. 4419/// 4420/// \param From The expression we are copying from. 4421/// 4422/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4423/// Otherwise, it's a non-static member subobject. 4424/// 4425/// \param Depth Internal parameter recording the depth of the recursion. 4426/// 4427/// \returns A statement or a loop that copies the expressions. 4428static Sema::OwningStmtResult 4429BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4430 Sema::OwningExprResult To, Sema::OwningExprResult From, 4431 bool CopyingBaseSubobject, unsigned Depth = 0) { 4432 typedef Sema::OwningStmtResult OwningStmtResult; 4433 typedef Sema::OwningExprResult OwningExprResult; 4434 4435 // C++0x [class.copy]p30: 4436 // Each subobject is assigned in the manner appropriate to its type: 4437 // 4438 // - if the subobject is of class type, the copy assignment operator 4439 // for the class is used (as if by explicit qualification; that is, 4440 // ignoring any possible virtual overriding functions in more derived 4441 // classes); 4442 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4443 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4444 4445 // Look for operator=. 4446 DeclarationName Name 4447 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4448 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4449 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4450 4451 // Filter out any result that isn't a copy-assignment operator. 4452 LookupResult::Filter F = OpLookup.makeFilter(); 4453 while (F.hasNext()) { 4454 NamedDecl *D = F.next(); 4455 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4456 if (Method->isCopyAssignmentOperator()) 4457 continue; 4458 4459 F.erase(); 4460 } 4461 F.done(); 4462 4463 // Suppress the protected check (C++ [class.protected]) for each of the 4464 // assignment operators we found. This strange dance is required when 4465 // we're assigning via a base classes's copy-assignment operator. To 4466 // ensure that we're getting the right base class subobject (without 4467 // ambiguities), we need to cast "this" to that subobject type; to 4468 // ensure that we don't go through the virtual call mechanism, we need 4469 // to qualify the operator= name with the base class (see below). However, 4470 // this means that if the base class has a protected copy assignment 4471 // operator, the protected member access check will fail. So, we 4472 // rewrite "protected" access to "public" access in this case, since we 4473 // know by construction that we're calling from a derived class. 4474 if (CopyingBaseSubobject) { 4475 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4476 L != LEnd; ++L) { 4477 if (L.getAccess() == AS_protected) 4478 L.setAccess(AS_public); 4479 } 4480 } 4481 4482 // Create the nested-name-specifier that will be used to qualify the 4483 // reference to operator=; this is required to suppress the virtual 4484 // call mechanism. 4485 CXXScopeSpec SS; 4486 SS.setRange(Loc); 4487 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4488 T.getTypePtr())); 4489 4490 // Create the reference to operator=. 4491 OwningExprResult OpEqualRef 4492 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4493 /*FirstQualifierInScope=*/0, OpLookup, 4494 /*TemplateArgs=*/0, 4495 /*SuppressQualifierCheck=*/true); 4496 if (OpEqualRef.isInvalid()) 4497 return S.StmtError(); 4498 4499 // Build the call to the assignment operator. 4500 Expr *FromE = From.takeAs<Expr>(); 4501 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4502 OpEqualRef.takeAs<Expr>(), 4503 Loc, &FromE, 1, 0, Loc); 4504 if (Call.isInvalid()) 4505 return S.StmtError(); 4506 4507 return S.Owned(Call.takeAs<Stmt>()); 4508 } 4509 4510 // - if the subobject is of scalar type, the built-in assignment 4511 // operator is used. 4512 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4513 if (!ArrayTy) { 4514 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4515 BinaryOperator::Assign, 4516 To.takeAs<Expr>(), 4517 From.takeAs<Expr>()); 4518 if (Assignment.isInvalid()) 4519 return S.StmtError(); 4520 4521 return S.Owned(Assignment.takeAs<Stmt>()); 4522 } 4523 4524 // - if the subobject is an array, each element is assigned, in the 4525 // manner appropriate to the element type; 4526 4527 // Construct a loop over the array bounds, e.g., 4528 // 4529 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4530 // 4531 // that will copy each of the array elements. 4532 QualType SizeType = S.Context.getSizeType(); 4533 4534 // Create the iteration variable. 4535 IdentifierInfo *IterationVarName = 0; 4536 { 4537 llvm::SmallString<8> Str; 4538 llvm::raw_svector_ostream OS(Str); 4539 OS << "__i" << Depth; 4540 IterationVarName = &S.Context.Idents.get(OS.str()); 4541 } 4542 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4543 IterationVarName, SizeType, 4544 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4545 VarDecl::None, VarDecl::None); 4546 4547 // Initialize the iteration variable to zero. 4548 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4549 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4550 4551 // Create a reference to the iteration variable; we'll use this several 4552 // times throughout. 4553 Expr *IterationVarRef 4554 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4555 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4556 4557 // Create the DeclStmt that holds the iteration variable. 4558 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4559 4560 // Create the comparison against the array bound. 4561 llvm::APInt Upper = ArrayTy->getSize(); 4562 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4563 OwningExprResult Comparison 4564 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4565 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4566 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4567 4568 // Create the pre-increment of the iteration variable. 4569 OwningExprResult Increment 4570 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4571 UnaryOperator::PreInc, 4572 SizeType, Loc)); 4573 4574 // Subscript the "from" and "to" expressions with the iteration variable. 4575 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4576 S.Owned(IterationVarRef->Retain()), 4577 Loc); 4578 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4579 S.Owned(IterationVarRef->Retain()), 4580 Loc); 4581 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4582 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4583 4584 // Build the copy for an individual element of the array. 4585 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4586 ArrayTy->getElementType(), 4587 move(To), move(From), 4588 CopyingBaseSubobject, Depth+1); 4589 if (Copy.isInvalid()) 4590 return S.StmtError(); 4591 4592 // Construct the loop that copies all elements of this array. 4593 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4594 S.MakeFullExpr(Comparison), 4595 Sema::DeclPtrTy(), 4596 S.MakeFullExpr(Increment), 4597 Loc, move(Copy)); 4598} 4599 4600/// \brief Determine whether the given class has a copy assignment operator 4601/// that accepts a const-qualified argument. 4602static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4603 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4604 4605 if (!Class->hasDeclaredCopyAssignment()) 4606 S.DeclareImplicitCopyAssignment(Class); 4607 4608 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4609 DeclarationName OpName 4610 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4611 4612 DeclContext::lookup_const_iterator Op, OpEnd; 4613 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4614 // C++ [class.copy]p9: 4615 // A user-declared copy assignment operator is a non-static non-template 4616 // member function of class X with exactly one parameter of type X, X&, 4617 // const X&, volatile X& or const volatile X&. 4618 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4619 if (!Method) 4620 continue; 4621 4622 if (Method->isStatic()) 4623 continue; 4624 if (Method->getPrimaryTemplate()) 4625 continue; 4626 const FunctionProtoType *FnType = 4627 Method->getType()->getAs<FunctionProtoType>(); 4628 assert(FnType && "Overloaded operator has no prototype."); 4629 // Don't assert on this; an invalid decl might have been left in the AST. 4630 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4631 continue; 4632 bool AcceptsConst = true; 4633 QualType ArgType = FnType->getArgType(0); 4634 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4635 ArgType = Ref->getPointeeType(); 4636 // Is it a non-const lvalue reference? 4637 if (!ArgType.isConstQualified()) 4638 AcceptsConst = false; 4639 } 4640 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4641 continue; 4642 4643 // We have a single argument of type cv X or cv X&, i.e. we've found the 4644 // copy assignment operator. Return whether it accepts const arguments. 4645 return AcceptsConst; 4646 } 4647 assert(Class->isInvalidDecl() && 4648 "No copy assignment operator declared in valid code."); 4649 return false; 4650} 4651 4652CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4653 // Note: The following rules are largely analoguous to the copy 4654 // constructor rules. Note that virtual bases are not taken into account 4655 // for determining the argument type of the operator. Note also that 4656 // operators taking an object instead of a reference are allowed. 4657 4658 4659 // C++ [class.copy]p10: 4660 // If the class definition does not explicitly declare a copy 4661 // assignment operator, one is declared implicitly. 4662 // The implicitly-defined copy assignment operator for a class X 4663 // will have the form 4664 // 4665 // X& X::operator=(const X&) 4666 // 4667 // if 4668 bool HasConstCopyAssignment = true; 4669 4670 // -- each direct base class B of X has a copy assignment operator 4671 // whose parameter is of type const B&, const volatile B& or B, 4672 // and 4673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4674 BaseEnd = ClassDecl->bases_end(); 4675 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4676 assert(!Base->getType()->isDependentType() && 4677 "Cannot generate implicit members for class with dependent bases."); 4678 const CXXRecordDecl *BaseClassDecl 4679 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4680 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4681 } 4682 4683 // -- for all the nonstatic data members of X that are of a class 4684 // type M (or array thereof), each such class type has a copy 4685 // assignment operator whose parameter is of type const M&, 4686 // const volatile M& or M. 4687 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4688 FieldEnd = ClassDecl->field_end(); 4689 HasConstCopyAssignment && Field != FieldEnd; 4690 ++Field) { 4691 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4692 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4693 const CXXRecordDecl *FieldClassDecl 4694 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4695 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4696 } 4697 } 4698 4699 // Otherwise, the implicitly declared copy assignment operator will 4700 // have the form 4701 // 4702 // X& X::operator=(X&) 4703 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4704 QualType RetType = Context.getLValueReferenceType(ArgType); 4705 if (HasConstCopyAssignment) 4706 ArgType = ArgType.withConst(); 4707 ArgType = Context.getLValueReferenceType(ArgType); 4708 4709 // C++ [except.spec]p14: 4710 // An implicitly declared special member function (Clause 12) shall have an 4711 // exception-specification. [...] 4712 ImplicitExceptionSpecification ExceptSpec(Context); 4713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4714 BaseEnd = ClassDecl->bases_end(); 4715 Base != BaseEnd; ++Base) { 4716 CXXRecordDecl *BaseClassDecl 4717 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4718 4719 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4720 DeclareImplicitCopyAssignment(BaseClassDecl); 4721 4722 if (CXXMethodDecl *CopyAssign 4723 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4724 ExceptSpec.CalledDecl(CopyAssign); 4725 } 4726 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4727 FieldEnd = ClassDecl->field_end(); 4728 Field != FieldEnd; 4729 ++Field) { 4730 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4731 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4732 CXXRecordDecl *FieldClassDecl 4733 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4734 4735 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4736 DeclareImplicitCopyAssignment(FieldClassDecl); 4737 4738 if (CXXMethodDecl *CopyAssign 4739 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4740 ExceptSpec.CalledDecl(CopyAssign); 4741 } 4742 } 4743 4744 // An implicitly-declared copy assignment operator is an inline public 4745 // member of its class. 4746 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4747 CXXMethodDecl *CopyAssignment 4748 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4749 Context.getFunctionType(RetType, &ArgType, 1, 4750 false, 0, 4751 ExceptSpec.hasExceptionSpecification(), 4752 ExceptSpec.hasAnyExceptionSpecification(), 4753 ExceptSpec.size(), 4754 ExceptSpec.data(), 4755 FunctionType::ExtInfo()), 4756 /*TInfo=*/0, /*isStatic=*/false, 4757 /*StorageClassAsWritten=*/FunctionDecl::None, 4758 /*isInline=*/true); 4759 CopyAssignment->setAccess(AS_public); 4760 CopyAssignment->setImplicit(); 4761 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4762 CopyAssignment->setCopyAssignment(true); 4763 4764 // Add the parameter to the operator. 4765 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4766 ClassDecl->getLocation(), 4767 /*Id=*/0, 4768 ArgType, /*TInfo=*/0, 4769 VarDecl::None, 4770 VarDecl::None, 0); 4771 CopyAssignment->setParams(&FromParam, 1); 4772 4773 // Note that we have added this copy-assignment operator. 4774 ClassDecl->setDeclaredCopyAssignment(true); 4775 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4776 4777 if (Scope *S = getScopeForContext(ClassDecl)) 4778 PushOnScopeChains(CopyAssignment, S, false); 4779 ClassDecl->addDecl(CopyAssignment); 4780 4781 AddOverriddenMethods(ClassDecl, CopyAssignment); 4782 return CopyAssignment; 4783} 4784 4785void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4786 CXXMethodDecl *CopyAssignOperator) { 4787 assert((CopyAssignOperator->isImplicit() && 4788 CopyAssignOperator->isOverloadedOperator() && 4789 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4790 !CopyAssignOperator->isUsed(false)) && 4791 "DefineImplicitCopyAssignment called for wrong function"); 4792 4793 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4794 4795 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4796 CopyAssignOperator->setInvalidDecl(); 4797 return; 4798 } 4799 4800 CopyAssignOperator->setUsed(); 4801 4802 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4803 ErrorTrap Trap(*this); 4804 4805 // C++0x [class.copy]p30: 4806 // The implicitly-defined or explicitly-defaulted copy assignment operator 4807 // for a non-union class X performs memberwise copy assignment of its 4808 // subobjects. The direct base classes of X are assigned first, in the 4809 // order of their declaration in the base-specifier-list, and then the 4810 // immediate non-static data members of X are assigned, in the order in 4811 // which they were declared in the class definition. 4812 4813 // The statements that form the synthesized function body. 4814 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4815 4816 // The parameter for the "other" object, which we are copying from. 4817 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4818 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4819 QualType OtherRefType = Other->getType(); 4820 if (const LValueReferenceType *OtherRef 4821 = OtherRefType->getAs<LValueReferenceType>()) { 4822 OtherRefType = OtherRef->getPointeeType(); 4823 OtherQuals = OtherRefType.getQualifiers(); 4824 } 4825 4826 // Our location for everything implicitly-generated. 4827 SourceLocation Loc = CopyAssignOperator->getLocation(); 4828 4829 // Construct a reference to the "other" object. We'll be using this 4830 // throughout the generated ASTs. 4831 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4832 assert(OtherRef && "Reference to parameter cannot fail!"); 4833 4834 // Construct the "this" pointer. We'll be using this throughout the generated 4835 // ASTs. 4836 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4837 assert(This && "Reference to this cannot fail!"); 4838 4839 // Assign base classes. 4840 bool Invalid = false; 4841 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4842 E = ClassDecl->bases_end(); Base != E; ++Base) { 4843 // Form the assignment: 4844 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4845 QualType BaseType = Base->getType().getUnqualifiedType(); 4846 CXXRecordDecl *BaseClassDecl = 0; 4847 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4848 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4849 else { 4850 Invalid = true; 4851 continue; 4852 } 4853 4854 // Construct the "from" expression, which is an implicit cast to the 4855 // appropriately-qualified base type. 4856 Expr *From = OtherRef->Retain(); 4857 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4858 CastExpr::CK_UncheckedDerivedToBase, 4859 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4860 4861 // Dereference "this". 4862 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4863 Owned(This->Retain())); 4864 4865 // Implicitly cast "this" to the appropriately-qualified base type. 4866 Expr *ToE = To.takeAs<Expr>(); 4867 ImpCastExprToType(ToE, 4868 Context.getCVRQualifiedType(BaseType, 4869 CopyAssignOperator->getTypeQualifiers()), 4870 CastExpr::CK_UncheckedDerivedToBase, 4871 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4872 To = Owned(ToE); 4873 4874 // Build the copy. 4875 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4876 move(To), Owned(From), 4877 /*CopyingBaseSubobject=*/true); 4878 if (Copy.isInvalid()) { 4879 Diag(CurrentLocation, diag::note_member_synthesized_at) 4880 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4881 CopyAssignOperator->setInvalidDecl(); 4882 return; 4883 } 4884 4885 // Success! Record the copy. 4886 Statements.push_back(Copy.takeAs<Expr>()); 4887 } 4888 4889 // \brief Reference to the __builtin_memcpy function. 4890 Expr *BuiltinMemCpyRef = 0; 4891 // \brief Reference to the __builtin_objc_memmove_collectable function. 4892 Expr *CollectableMemCpyRef = 0; 4893 4894 // Assign non-static members. 4895 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4896 FieldEnd = ClassDecl->field_end(); 4897 Field != FieldEnd; ++Field) { 4898 // Check for members of reference type; we can't copy those. 4899 if (Field->getType()->isReferenceType()) { 4900 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4901 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4902 Diag(Field->getLocation(), diag::note_declared_at); 4903 Diag(CurrentLocation, diag::note_member_synthesized_at) 4904 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4905 Invalid = true; 4906 continue; 4907 } 4908 4909 // Check for members of const-qualified, non-class type. 4910 QualType BaseType = Context.getBaseElementType(Field->getType()); 4911 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4912 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4913 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4914 Diag(Field->getLocation(), diag::note_declared_at); 4915 Diag(CurrentLocation, diag::note_member_synthesized_at) 4916 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4917 Invalid = true; 4918 continue; 4919 } 4920 4921 QualType FieldType = Field->getType().getNonReferenceType(); 4922 if (FieldType->isIncompleteArrayType()) { 4923 assert(ClassDecl->hasFlexibleArrayMember() && 4924 "Incomplete array type is not valid"); 4925 continue; 4926 } 4927 4928 // Build references to the field in the object we're copying from and to. 4929 CXXScopeSpec SS; // Intentionally empty 4930 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4931 LookupMemberName); 4932 MemberLookup.addDecl(*Field); 4933 MemberLookup.resolveKind(); 4934 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4935 OtherRefType, 4936 Loc, /*IsArrow=*/false, 4937 SS, 0, MemberLookup, 0); 4938 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4939 This->getType(), 4940 Loc, /*IsArrow=*/true, 4941 SS, 0, MemberLookup, 0); 4942 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4943 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4944 4945 // If the field should be copied with __builtin_memcpy rather than via 4946 // explicit assignments, do so. This optimization only applies for arrays 4947 // of scalars and arrays of class type with trivial copy-assignment 4948 // operators. 4949 if (FieldType->isArrayType() && 4950 (!BaseType->isRecordType() || 4951 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4952 ->hasTrivialCopyAssignment())) { 4953 // Compute the size of the memory buffer to be copied. 4954 QualType SizeType = Context.getSizeType(); 4955 llvm::APInt Size(Context.getTypeSize(SizeType), 4956 Context.getTypeSizeInChars(BaseType).getQuantity()); 4957 for (const ConstantArrayType *Array 4958 = Context.getAsConstantArrayType(FieldType); 4959 Array; 4960 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4961 llvm::APInt ArraySize = Array->getSize(); 4962 ArraySize.zextOrTrunc(Size.getBitWidth()); 4963 Size *= ArraySize; 4964 } 4965 4966 // Take the address of the field references for "from" and "to". 4967 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4968 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4969 4970 bool NeedsCollectableMemCpy = 4971 (BaseType->isRecordType() && 4972 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4973 4974 if (NeedsCollectableMemCpy) { 4975 if (!CollectableMemCpyRef) { 4976 // Create a reference to the __builtin_objc_memmove_collectable function. 4977 LookupResult R(*this, 4978 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4979 Loc, LookupOrdinaryName); 4980 LookupName(R, TUScope, true); 4981 4982 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4983 if (!CollectableMemCpy) { 4984 // Something went horribly wrong earlier, and we will have 4985 // complained about it. 4986 Invalid = true; 4987 continue; 4988 } 4989 4990 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4991 CollectableMemCpy->getType(), 4992 Loc, 0).takeAs<Expr>(); 4993 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4994 } 4995 } 4996 // Create a reference to the __builtin_memcpy builtin function. 4997 else if (!BuiltinMemCpyRef) { 4998 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4999 LookupOrdinaryName); 5000 LookupName(R, TUScope, true); 5001 5002 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5003 if (!BuiltinMemCpy) { 5004 // Something went horribly wrong earlier, and we will have complained 5005 // about it. 5006 Invalid = true; 5007 continue; 5008 } 5009 5010 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5011 BuiltinMemCpy->getType(), 5012 Loc, 0).takeAs<Expr>(); 5013 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5014 } 5015 5016 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5017 CallArgs.push_back(To.takeAs<Expr>()); 5018 CallArgs.push_back(From.takeAs<Expr>()); 5019 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5020 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5021 Commas.push_back(Loc); 5022 Commas.push_back(Loc); 5023 OwningExprResult Call = ExprError(); 5024 if (NeedsCollectableMemCpy) 5025 Call = ActOnCallExpr(/*Scope=*/0, 5026 Owned(CollectableMemCpyRef->Retain()), 5027 Loc, move_arg(CallArgs), 5028 Commas.data(), Loc); 5029 else 5030 Call = ActOnCallExpr(/*Scope=*/0, 5031 Owned(BuiltinMemCpyRef->Retain()), 5032 Loc, move_arg(CallArgs), 5033 Commas.data(), Loc); 5034 5035 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5036 Statements.push_back(Call.takeAs<Expr>()); 5037 continue; 5038 } 5039 5040 // Build the copy of this field. 5041 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5042 move(To), move(From), 5043 /*CopyingBaseSubobject=*/false); 5044 if (Copy.isInvalid()) { 5045 Diag(CurrentLocation, diag::note_member_synthesized_at) 5046 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5047 CopyAssignOperator->setInvalidDecl(); 5048 return; 5049 } 5050 5051 // Success! Record the copy. 5052 Statements.push_back(Copy.takeAs<Stmt>()); 5053 } 5054 5055 if (!Invalid) { 5056 // Add a "return *this;" 5057 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5058 Owned(This->Retain())); 5059 5060 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5061 if (Return.isInvalid()) 5062 Invalid = true; 5063 else { 5064 Statements.push_back(Return.takeAs<Stmt>()); 5065 5066 if (Trap.hasErrorOccurred()) { 5067 Diag(CurrentLocation, diag::note_member_synthesized_at) 5068 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5069 Invalid = true; 5070 } 5071 } 5072 } 5073 5074 if (Invalid) { 5075 CopyAssignOperator->setInvalidDecl(); 5076 return; 5077 } 5078 5079 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5080 /*isStmtExpr=*/false); 5081 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5082 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5083} 5084 5085CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5086 CXXRecordDecl *ClassDecl) { 5087 // C++ [class.copy]p4: 5088 // If the class definition does not explicitly declare a copy 5089 // constructor, one is declared implicitly. 5090 5091 // C++ [class.copy]p5: 5092 // The implicitly-declared copy constructor for a class X will 5093 // have the form 5094 // 5095 // X::X(const X&) 5096 // 5097 // if 5098 bool HasConstCopyConstructor = true; 5099 5100 // -- each direct or virtual base class B of X has a copy 5101 // constructor whose first parameter is of type const B& or 5102 // const volatile B&, and 5103 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5104 BaseEnd = ClassDecl->bases_end(); 5105 HasConstCopyConstructor && Base != BaseEnd; 5106 ++Base) { 5107 // Virtual bases are handled below. 5108 if (Base->isVirtual()) 5109 continue; 5110 5111 CXXRecordDecl *BaseClassDecl 5112 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5113 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5114 DeclareImplicitCopyConstructor(BaseClassDecl); 5115 5116 HasConstCopyConstructor 5117 = BaseClassDecl->hasConstCopyConstructor(Context); 5118 } 5119 5120 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5121 BaseEnd = ClassDecl->vbases_end(); 5122 HasConstCopyConstructor && Base != BaseEnd; 5123 ++Base) { 5124 CXXRecordDecl *BaseClassDecl 5125 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5126 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5127 DeclareImplicitCopyConstructor(BaseClassDecl); 5128 5129 HasConstCopyConstructor 5130 = BaseClassDecl->hasConstCopyConstructor(Context); 5131 } 5132 5133 // -- for all the nonstatic data members of X that are of a 5134 // class type M (or array thereof), each such class type 5135 // has a copy constructor whose first parameter is of type 5136 // const M& or const volatile M&. 5137 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5138 FieldEnd = ClassDecl->field_end(); 5139 HasConstCopyConstructor && Field != FieldEnd; 5140 ++Field) { 5141 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5142 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5143 CXXRecordDecl *FieldClassDecl 5144 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5145 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5146 DeclareImplicitCopyConstructor(FieldClassDecl); 5147 5148 HasConstCopyConstructor 5149 = FieldClassDecl->hasConstCopyConstructor(Context); 5150 } 5151 } 5152 5153 // Otherwise, the implicitly declared copy constructor will have 5154 // the form 5155 // 5156 // X::X(X&) 5157 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5158 QualType ArgType = ClassType; 5159 if (HasConstCopyConstructor) 5160 ArgType = ArgType.withConst(); 5161 ArgType = Context.getLValueReferenceType(ArgType); 5162 5163 // C++ [except.spec]p14: 5164 // An implicitly declared special member function (Clause 12) shall have an 5165 // exception-specification. [...] 5166 ImplicitExceptionSpecification ExceptSpec(Context); 5167 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5168 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5169 BaseEnd = ClassDecl->bases_end(); 5170 Base != BaseEnd; 5171 ++Base) { 5172 // Virtual bases are handled below. 5173 if (Base->isVirtual()) 5174 continue; 5175 5176 CXXRecordDecl *BaseClassDecl 5177 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5178 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5179 DeclareImplicitCopyConstructor(BaseClassDecl); 5180 5181 if (CXXConstructorDecl *CopyConstructor 5182 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5183 ExceptSpec.CalledDecl(CopyConstructor); 5184 } 5185 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5186 BaseEnd = ClassDecl->vbases_end(); 5187 Base != BaseEnd; 5188 ++Base) { 5189 CXXRecordDecl *BaseClassDecl 5190 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5191 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5192 DeclareImplicitCopyConstructor(BaseClassDecl); 5193 5194 if (CXXConstructorDecl *CopyConstructor 5195 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5196 ExceptSpec.CalledDecl(CopyConstructor); 5197 } 5198 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5199 FieldEnd = ClassDecl->field_end(); 5200 Field != FieldEnd; 5201 ++Field) { 5202 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5203 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5204 CXXRecordDecl *FieldClassDecl 5205 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5206 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5207 DeclareImplicitCopyConstructor(FieldClassDecl); 5208 5209 if (CXXConstructorDecl *CopyConstructor 5210 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5211 ExceptSpec.CalledDecl(CopyConstructor); 5212 } 5213 } 5214 5215 // An implicitly-declared copy constructor is an inline public 5216 // member of its class. 5217 DeclarationName Name 5218 = Context.DeclarationNames.getCXXConstructorName( 5219 Context.getCanonicalType(ClassType)); 5220 CXXConstructorDecl *CopyConstructor 5221 = CXXConstructorDecl::Create(Context, ClassDecl, 5222 ClassDecl->getLocation(), Name, 5223 Context.getFunctionType(Context.VoidTy, 5224 &ArgType, 1, 5225 false, 0, 5226 ExceptSpec.hasExceptionSpecification(), 5227 ExceptSpec.hasAnyExceptionSpecification(), 5228 ExceptSpec.size(), 5229 ExceptSpec.data(), 5230 FunctionType::ExtInfo()), 5231 /*TInfo=*/0, 5232 /*isExplicit=*/false, 5233 /*isInline=*/true, 5234 /*isImplicitlyDeclared=*/true); 5235 CopyConstructor->setAccess(AS_public); 5236 CopyConstructor->setImplicit(); 5237 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5238 5239 // Note that we have declared this constructor. 5240 ClassDecl->setDeclaredCopyConstructor(true); 5241 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5242 5243 // Add the parameter to the constructor. 5244 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5245 ClassDecl->getLocation(), 5246 /*IdentifierInfo=*/0, 5247 ArgType, /*TInfo=*/0, 5248 VarDecl::None, 5249 VarDecl::None, 0); 5250 CopyConstructor->setParams(&FromParam, 1); 5251 if (Scope *S = getScopeForContext(ClassDecl)) 5252 PushOnScopeChains(CopyConstructor, S, false); 5253 ClassDecl->addDecl(CopyConstructor); 5254 5255 return CopyConstructor; 5256} 5257 5258void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5259 CXXConstructorDecl *CopyConstructor, 5260 unsigned TypeQuals) { 5261 assert((CopyConstructor->isImplicit() && 5262 CopyConstructor->isCopyConstructor(TypeQuals) && 5263 !CopyConstructor->isUsed(false)) && 5264 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5265 5266 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5267 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5268 5269 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5270 ErrorTrap Trap(*this); 5271 5272 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5273 Trap.hasErrorOccurred()) { 5274 Diag(CurrentLocation, diag::note_member_synthesized_at) 5275 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5276 CopyConstructor->setInvalidDecl(); 5277 } else { 5278 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5279 CopyConstructor->getLocation(), 5280 MultiStmtArg(*this, 0, 0), 5281 /*isStmtExpr=*/false) 5282 .takeAs<Stmt>()); 5283 } 5284 5285 CopyConstructor->setUsed(); 5286} 5287 5288Sema::OwningExprResult 5289Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5290 CXXConstructorDecl *Constructor, 5291 MultiExprArg ExprArgs, 5292 bool RequiresZeroInit, 5293 CXXConstructExpr::ConstructionKind ConstructKind) { 5294 bool Elidable = false; 5295 5296 // C++0x [class.copy]p34: 5297 // When certain criteria are met, an implementation is allowed to 5298 // omit the copy/move construction of a class object, even if the 5299 // copy/move constructor and/or destructor for the object have 5300 // side effects. [...] 5301 // - when a temporary class object that has not been bound to a 5302 // reference (12.2) would be copied/moved to a class object 5303 // with the same cv-unqualified type, the copy/move operation 5304 // can be omitted by constructing the temporary object 5305 // directly into the target of the omitted copy/move 5306 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5307 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5308 Elidable = SubExpr->isTemporaryObject() && 5309 Context.hasSameUnqualifiedType(SubExpr->getType(), 5310 Context.getTypeDeclType(Constructor->getParent())); 5311 } 5312 5313 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5314 Elidable, move(ExprArgs), RequiresZeroInit, 5315 ConstructKind); 5316} 5317 5318/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5319/// including handling of its default argument expressions. 5320Sema::OwningExprResult 5321Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5322 CXXConstructorDecl *Constructor, bool Elidable, 5323 MultiExprArg ExprArgs, 5324 bool RequiresZeroInit, 5325 CXXConstructExpr::ConstructionKind ConstructKind) { 5326 unsigned NumExprs = ExprArgs.size(); 5327 Expr **Exprs = (Expr **)ExprArgs.release(); 5328 5329 MarkDeclarationReferenced(ConstructLoc, Constructor); 5330 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5331 Constructor, Elidable, Exprs, NumExprs, 5332 RequiresZeroInit, ConstructKind)); 5333} 5334 5335bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5336 CXXConstructorDecl *Constructor, 5337 MultiExprArg Exprs) { 5338 OwningExprResult TempResult = 5339 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5340 move(Exprs)); 5341 if (TempResult.isInvalid()) 5342 return true; 5343 5344 Expr *Temp = TempResult.takeAs<Expr>(); 5345 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5346 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5347 VD->setInit(Temp); 5348 5349 return false; 5350} 5351 5352void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5353 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5354 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5355 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5356 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5357 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5358 CheckDestructorAccess(VD->getLocation(), Destructor, 5359 PDiag(diag::err_access_dtor_var) 5360 << VD->getDeclName() 5361 << VD->getType()); 5362 5363 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5364 Diag(VD->getLocation(), diag::warn_global_destructor); 5365 } 5366} 5367 5368/// AddCXXDirectInitializerToDecl - This action is called immediately after 5369/// ActOnDeclarator, when a C++ direct initializer is present. 5370/// e.g: "int x(1);" 5371void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5372 SourceLocation LParenLoc, 5373 MultiExprArg Exprs, 5374 SourceLocation *CommaLocs, 5375 SourceLocation RParenLoc) { 5376 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5377 Decl *RealDecl = Dcl.getAs<Decl>(); 5378 5379 // If there is no declaration, there was an error parsing it. Just ignore 5380 // the initializer. 5381 if (RealDecl == 0) 5382 return; 5383 5384 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5385 if (!VDecl) { 5386 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5387 RealDecl->setInvalidDecl(); 5388 return; 5389 } 5390 5391 // We will represent direct-initialization similarly to copy-initialization: 5392 // int x(1); -as-> int x = 1; 5393 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5394 // 5395 // Clients that want to distinguish between the two forms, can check for 5396 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5397 // A major benefit is that clients that don't particularly care about which 5398 // exactly form was it (like the CodeGen) can handle both cases without 5399 // special case code. 5400 5401 // C++ 8.5p11: 5402 // The form of initialization (using parentheses or '=') is generally 5403 // insignificant, but does matter when the entity being initialized has a 5404 // class type. 5405 5406 if (!VDecl->getType()->isDependentType() && 5407 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5408 diag::err_typecheck_decl_incomplete_type)) { 5409 VDecl->setInvalidDecl(); 5410 return; 5411 } 5412 5413 // The variable can not have an abstract class type. 5414 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5415 diag::err_abstract_type_in_decl, 5416 AbstractVariableType)) 5417 VDecl->setInvalidDecl(); 5418 5419 const VarDecl *Def; 5420 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5421 Diag(VDecl->getLocation(), diag::err_redefinition) 5422 << VDecl->getDeclName(); 5423 Diag(Def->getLocation(), diag::note_previous_definition); 5424 VDecl->setInvalidDecl(); 5425 return; 5426 } 5427 5428 // If either the declaration has a dependent type or if any of the 5429 // expressions is type-dependent, we represent the initialization 5430 // via a ParenListExpr for later use during template instantiation. 5431 if (VDecl->getType()->isDependentType() || 5432 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5433 // Let clients know that initialization was done with a direct initializer. 5434 VDecl->setCXXDirectInitializer(true); 5435 5436 // Store the initialization expressions as a ParenListExpr. 5437 unsigned NumExprs = Exprs.size(); 5438 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5439 (Expr **)Exprs.release(), 5440 NumExprs, RParenLoc)); 5441 return; 5442 } 5443 5444 // Capture the variable that is being initialized and the style of 5445 // initialization. 5446 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5447 5448 // FIXME: Poor source location information. 5449 InitializationKind Kind 5450 = InitializationKind::CreateDirect(VDecl->getLocation(), 5451 LParenLoc, RParenLoc); 5452 5453 InitializationSequence InitSeq(*this, Entity, Kind, 5454 (Expr**)Exprs.get(), Exprs.size()); 5455 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5456 if (Result.isInvalid()) { 5457 VDecl->setInvalidDecl(); 5458 return; 5459 } 5460 5461 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5462 VDecl->setInit(Result.takeAs<Expr>()); 5463 VDecl->setCXXDirectInitializer(true); 5464 5465 if (!VDecl->isInvalidDecl() && 5466 !VDecl->getDeclContext()->isDependentContext() && 5467 VDecl->hasGlobalStorage() && 5468 !VDecl->getInit()->isConstantInitializer(Context, 5469 VDecl->getType()->isReferenceType())) 5470 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5471 << VDecl->getInit()->getSourceRange(); 5472 5473 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5474 FinalizeVarWithDestructor(VDecl, Record); 5475} 5476 5477/// \brief Given a constructor and the set of arguments provided for the 5478/// constructor, convert the arguments and add any required default arguments 5479/// to form a proper call to this constructor. 5480/// 5481/// \returns true if an error occurred, false otherwise. 5482bool 5483Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5484 MultiExprArg ArgsPtr, 5485 SourceLocation Loc, 5486 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5487 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5488 unsigned NumArgs = ArgsPtr.size(); 5489 Expr **Args = (Expr **)ArgsPtr.get(); 5490 5491 const FunctionProtoType *Proto 5492 = Constructor->getType()->getAs<FunctionProtoType>(); 5493 assert(Proto && "Constructor without a prototype?"); 5494 unsigned NumArgsInProto = Proto->getNumArgs(); 5495 5496 // If too few arguments are available, we'll fill in the rest with defaults. 5497 if (NumArgs < NumArgsInProto) 5498 ConvertedArgs.reserve(NumArgsInProto); 5499 else 5500 ConvertedArgs.reserve(NumArgs); 5501 5502 VariadicCallType CallType = 5503 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5504 llvm::SmallVector<Expr *, 8> AllArgs; 5505 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5506 Proto, 0, Args, NumArgs, AllArgs, 5507 CallType); 5508 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5509 ConvertedArgs.push_back(AllArgs[i]); 5510 return Invalid; 5511} 5512 5513static inline bool 5514CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5515 const FunctionDecl *FnDecl) { 5516 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5517 if (isa<NamespaceDecl>(DC)) { 5518 return SemaRef.Diag(FnDecl->getLocation(), 5519 diag::err_operator_new_delete_declared_in_namespace) 5520 << FnDecl->getDeclName(); 5521 } 5522 5523 if (isa<TranslationUnitDecl>(DC) && 5524 FnDecl->getStorageClass() == FunctionDecl::Static) { 5525 return SemaRef.Diag(FnDecl->getLocation(), 5526 diag::err_operator_new_delete_declared_static) 5527 << FnDecl->getDeclName(); 5528 } 5529 5530 return false; 5531} 5532 5533static inline bool 5534CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5535 CanQualType ExpectedResultType, 5536 CanQualType ExpectedFirstParamType, 5537 unsigned DependentParamTypeDiag, 5538 unsigned InvalidParamTypeDiag) { 5539 QualType ResultType = 5540 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5541 5542 // Check that the result type is not dependent. 5543 if (ResultType->isDependentType()) 5544 return SemaRef.Diag(FnDecl->getLocation(), 5545 diag::err_operator_new_delete_dependent_result_type) 5546 << FnDecl->getDeclName() << ExpectedResultType; 5547 5548 // Check that the result type is what we expect. 5549 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5550 return SemaRef.Diag(FnDecl->getLocation(), 5551 diag::err_operator_new_delete_invalid_result_type) 5552 << FnDecl->getDeclName() << ExpectedResultType; 5553 5554 // A function template must have at least 2 parameters. 5555 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5556 return SemaRef.Diag(FnDecl->getLocation(), 5557 diag::err_operator_new_delete_template_too_few_parameters) 5558 << FnDecl->getDeclName(); 5559 5560 // The function decl must have at least 1 parameter. 5561 if (FnDecl->getNumParams() == 0) 5562 return SemaRef.Diag(FnDecl->getLocation(), 5563 diag::err_operator_new_delete_too_few_parameters) 5564 << FnDecl->getDeclName(); 5565 5566 // Check the the first parameter type is not dependent. 5567 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5568 if (FirstParamType->isDependentType()) 5569 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5570 << FnDecl->getDeclName() << ExpectedFirstParamType; 5571 5572 // Check that the first parameter type is what we expect. 5573 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5574 ExpectedFirstParamType) 5575 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5576 << FnDecl->getDeclName() << ExpectedFirstParamType; 5577 5578 return false; 5579} 5580 5581static bool 5582CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5583 // C++ [basic.stc.dynamic.allocation]p1: 5584 // A program is ill-formed if an allocation function is declared in a 5585 // namespace scope other than global scope or declared static in global 5586 // scope. 5587 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5588 return true; 5589 5590 CanQualType SizeTy = 5591 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5592 5593 // C++ [basic.stc.dynamic.allocation]p1: 5594 // The return type shall be void*. The first parameter shall have type 5595 // std::size_t. 5596 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5597 SizeTy, 5598 diag::err_operator_new_dependent_param_type, 5599 diag::err_operator_new_param_type)) 5600 return true; 5601 5602 // C++ [basic.stc.dynamic.allocation]p1: 5603 // The first parameter shall not have an associated default argument. 5604 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5605 return SemaRef.Diag(FnDecl->getLocation(), 5606 diag::err_operator_new_default_arg) 5607 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5608 5609 return false; 5610} 5611 5612static bool 5613CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5614 // C++ [basic.stc.dynamic.deallocation]p1: 5615 // A program is ill-formed if deallocation functions are declared in a 5616 // namespace scope other than global scope or declared static in global 5617 // scope. 5618 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5619 return true; 5620 5621 // C++ [basic.stc.dynamic.deallocation]p2: 5622 // Each deallocation function shall return void and its first parameter 5623 // shall be void*. 5624 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5625 SemaRef.Context.VoidPtrTy, 5626 diag::err_operator_delete_dependent_param_type, 5627 diag::err_operator_delete_param_type)) 5628 return true; 5629 5630 return false; 5631} 5632 5633/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5634/// of this overloaded operator is well-formed. If so, returns false; 5635/// otherwise, emits appropriate diagnostics and returns true. 5636bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5637 assert(FnDecl && FnDecl->isOverloadedOperator() && 5638 "Expected an overloaded operator declaration"); 5639 5640 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5641 5642 // C++ [over.oper]p5: 5643 // The allocation and deallocation functions, operator new, 5644 // operator new[], operator delete and operator delete[], are 5645 // described completely in 3.7.3. The attributes and restrictions 5646 // found in the rest of this subclause do not apply to them unless 5647 // explicitly stated in 3.7.3. 5648 if (Op == OO_Delete || Op == OO_Array_Delete) 5649 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5650 5651 if (Op == OO_New || Op == OO_Array_New) 5652 return CheckOperatorNewDeclaration(*this, FnDecl); 5653 5654 // C++ [over.oper]p6: 5655 // An operator function shall either be a non-static member 5656 // function or be a non-member function and have at least one 5657 // parameter whose type is a class, a reference to a class, an 5658 // enumeration, or a reference to an enumeration. 5659 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5660 if (MethodDecl->isStatic()) 5661 return Diag(FnDecl->getLocation(), 5662 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5663 } else { 5664 bool ClassOrEnumParam = false; 5665 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5666 ParamEnd = FnDecl->param_end(); 5667 Param != ParamEnd; ++Param) { 5668 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5669 if (ParamType->isDependentType() || ParamType->isRecordType() || 5670 ParamType->isEnumeralType()) { 5671 ClassOrEnumParam = true; 5672 break; 5673 } 5674 } 5675 5676 if (!ClassOrEnumParam) 5677 return Diag(FnDecl->getLocation(), 5678 diag::err_operator_overload_needs_class_or_enum) 5679 << FnDecl->getDeclName(); 5680 } 5681 5682 // C++ [over.oper]p8: 5683 // An operator function cannot have default arguments (8.3.6), 5684 // except where explicitly stated below. 5685 // 5686 // Only the function-call operator allows default arguments 5687 // (C++ [over.call]p1). 5688 if (Op != OO_Call) { 5689 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5690 Param != FnDecl->param_end(); ++Param) { 5691 if ((*Param)->hasDefaultArg()) 5692 return Diag((*Param)->getLocation(), 5693 diag::err_operator_overload_default_arg) 5694 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5695 } 5696 } 5697 5698 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5699 { false, false, false } 5700#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5701 , { Unary, Binary, MemberOnly } 5702#include "clang/Basic/OperatorKinds.def" 5703 }; 5704 5705 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5706 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5707 bool MustBeMemberOperator = OperatorUses[Op][2]; 5708 5709 // C++ [over.oper]p8: 5710 // [...] Operator functions cannot have more or fewer parameters 5711 // than the number required for the corresponding operator, as 5712 // described in the rest of this subclause. 5713 unsigned NumParams = FnDecl->getNumParams() 5714 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5715 if (Op != OO_Call && 5716 ((NumParams == 1 && !CanBeUnaryOperator) || 5717 (NumParams == 2 && !CanBeBinaryOperator) || 5718 (NumParams < 1) || (NumParams > 2))) { 5719 // We have the wrong number of parameters. 5720 unsigned ErrorKind; 5721 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5722 ErrorKind = 2; // 2 -> unary or binary. 5723 } else if (CanBeUnaryOperator) { 5724 ErrorKind = 0; // 0 -> unary 5725 } else { 5726 assert(CanBeBinaryOperator && 5727 "All non-call overloaded operators are unary or binary!"); 5728 ErrorKind = 1; // 1 -> binary 5729 } 5730 5731 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5732 << FnDecl->getDeclName() << NumParams << ErrorKind; 5733 } 5734 5735 // Overloaded operators other than operator() cannot be variadic. 5736 if (Op != OO_Call && 5737 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5738 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5739 << FnDecl->getDeclName(); 5740 } 5741 5742 // Some operators must be non-static member functions. 5743 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5744 return Diag(FnDecl->getLocation(), 5745 diag::err_operator_overload_must_be_member) 5746 << FnDecl->getDeclName(); 5747 } 5748 5749 // C++ [over.inc]p1: 5750 // The user-defined function called operator++ implements the 5751 // prefix and postfix ++ operator. If this function is a member 5752 // function with no parameters, or a non-member function with one 5753 // parameter of class or enumeration type, it defines the prefix 5754 // increment operator ++ for objects of that type. If the function 5755 // is a member function with one parameter (which shall be of type 5756 // int) or a non-member function with two parameters (the second 5757 // of which shall be of type int), it defines the postfix 5758 // increment operator ++ for objects of that type. 5759 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5760 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5761 bool ParamIsInt = false; 5762 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5763 ParamIsInt = BT->getKind() == BuiltinType::Int; 5764 5765 if (!ParamIsInt) 5766 return Diag(LastParam->getLocation(), 5767 diag::err_operator_overload_post_incdec_must_be_int) 5768 << LastParam->getType() << (Op == OO_MinusMinus); 5769 } 5770 5771 // Notify the class if it got an assignment operator. 5772 if (Op == OO_Equal) { 5773 // Would have returned earlier otherwise. 5774 assert(isa<CXXMethodDecl>(FnDecl) && 5775 "Overloaded = not member, but not filtered."); 5776 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5777 Method->getParent()->addedAssignmentOperator(Context, Method); 5778 } 5779 5780 return false; 5781} 5782 5783/// CheckLiteralOperatorDeclaration - Check whether the declaration 5784/// of this literal operator function is well-formed. If so, returns 5785/// false; otherwise, emits appropriate diagnostics and returns true. 5786bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5787 DeclContext *DC = FnDecl->getDeclContext(); 5788 Decl::Kind Kind = DC->getDeclKind(); 5789 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5790 Kind != Decl::LinkageSpec) { 5791 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5792 << FnDecl->getDeclName(); 5793 return true; 5794 } 5795 5796 bool Valid = false; 5797 5798 // template <char...> type operator "" name() is the only valid template 5799 // signature, and the only valid signature with no parameters. 5800 if (FnDecl->param_size() == 0) { 5801 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5802 // Must have only one template parameter 5803 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5804 if (Params->size() == 1) { 5805 NonTypeTemplateParmDecl *PmDecl = 5806 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5807 5808 // The template parameter must be a char parameter pack. 5809 // FIXME: This test will always fail because non-type parameter packs 5810 // have not been implemented. 5811 if (PmDecl && PmDecl->isTemplateParameterPack() && 5812 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5813 Valid = true; 5814 } 5815 } 5816 } else { 5817 // Check the first parameter 5818 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5819 5820 QualType T = (*Param)->getType(); 5821 5822 // unsigned long long int, long double, and any character type are allowed 5823 // as the only parameters. 5824 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5825 Context.hasSameType(T, Context.LongDoubleTy) || 5826 Context.hasSameType(T, Context.CharTy) || 5827 Context.hasSameType(T, Context.WCharTy) || 5828 Context.hasSameType(T, Context.Char16Ty) || 5829 Context.hasSameType(T, Context.Char32Ty)) { 5830 if (++Param == FnDecl->param_end()) 5831 Valid = true; 5832 goto FinishedParams; 5833 } 5834 5835 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5836 const PointerType *PT = T->getAs<PointerType>(); 5837 if (!PT) 5838 goto FinishedParams; 5839 T = PT->getPointeeType(); 5840 if (!T.isConstQualified()) 5841 goto FinishedParams; 5842 T = T.getUnqualifiedType(); 5843 5844 // Move on to the second parameter; 5845 ++Param; 5846 5847 // If there is no second parameter, the first must be a const char * 5848 if (Param == FnDecl->param_end()) { 5849 if (Context.hasSameType(T, Context.CharTy)) 5850 Valid = true; 5851 goto FinishedParams; 5852 } 5853 5854 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5855 // are allowed as the first parameter to a two-parameter function 5856 if (!(Context.hasSameType(T, Context.CharTy) || 5857 Context.hasSameType(T, Context.WCharTy) || 5858 Context.hasSameType(T, Context.Char16Ty) || 5859 Context.hasSameType(T, Context.Char32Ty))) 5860 goto FinishedParams; 5861 5862 // The second and final parameter must be an std::size_t 5863 T = (*Param)->getType().getUnqualifiedType(); 5864 if (Context.hasSameType(T, Context.getSizeType()) && 5865 ++Param == FnDecl->param_end()) 5866 Valid = true; 5867 } 5868 5869 // FIXME: This diagnostic is absolutely terrible. 5870FinishedParams: 5871 if (!Valid) { 5872 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5873 << FnDecl->getDeclName(); 5874 return true; 5875 } 5876 5877 return false; 5878} 5879 5880/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5881/// linkage specification, including the language and (if present) 5882/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5883/// the location of the language string literal, which is provided 5884/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5885/// the '{' brace. Otherwise, this linkage specification does not 5886/// have any braces. 5887Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5888 SourceLocation ExternLoc, 5889 SourceLocation LangLoc, 5890 llvm::StringRef Lang, 5891 SourceLocation LBraceLoc) { 5892 LinkageSpecDecl::LanguageIDs Language; 5893 if (Lang == "\"C\"") 5894 Language = LinkageSpecDecl::lang_c; 5895 else if (Lang == "\"C++\"") 5896 Language = LinkageSpecDecl::lang_cxx; 5897 else { 5898 Diag(LangLoc, diag::err_bad_language); 5899 return DeclPtrTy(); 5900 } 5901 5902 // FIXME: Add all the various semantics of linkage specifications 5903 5904 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5905 LangLoc, Language, 5906 LBraceLoc.isValid()); 5907 CurContext->addDecl(D); 5908 PushDeclContext(S, D); 5909 return DeclPtrTy::make(D); 5910} 5911 5912/// ActOnFinishLinkageSpecification - Complete the definition of 5913/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5914/// valid, it's the position of the closing '}' brace in a linkage 5915/// specification that uses braces. 5916Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5917 DeclPtrTy LinkageSpec, 5918 SourceLocation RBraceLoc) { 5919 if (LinkageSpec) 5920 PopDeclContext(); 5921 return LinkageSpec; 5922} 5923 5924/// \brief Perform semantic analysis for the variable declaration that 5925/// occurs within a C++ catch clause, returning the newly-created 5926/// variable. 5927VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5928 TypeSourceInfo *TInfo, 5929 IdentifierInfo *Name, 5930 SourceLocation Loc, 5931 SourceRange Range) { 5932 bool Invalid = false; 5933 5934 // Arrays and functions decay. 5935 if (ExDeclType->isArrayType()) 5936 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5937 else if (ExDeclType->isFunctionType()) 5938 ExDeclType = Context.getPointerType(ExDeclType); 5939 5940 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5941 // The exception-declaration shall not denote a pointer or reference to an 5942 // incomplete type, other than [cv] void*. 5943 // N2844 forbids rvalue references. 5944 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5945 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5946 Invalid = true; 5947 } 5948 5949 // GCC allows catching pointers and references to incomplete types 5950 // as an extension; so do we, but we warn by default. 5951 5952 QualType BaseType = ExDeclType; 5953 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5954 unsigned DK = diag::err_catch_incomplete; 5955 bool IncompleteCatchIsInvalid = true; 5956 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5957 BaseType = Ptr->getPointeeType(); 5958 Mode = 1; 5959 DK = diag::ext_catch_incomplete_ptr; 5960 IncompleteCatchIsInvalid = false; 5961 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5962 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5963 BaseType = Ref->getPointeeType(); 5964 Mode = 2; 5965 DK = diag::ext_catch_incomplete_ref; 5966 IncompleteCatchIsInvalid = false; 5967 } 5968 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5969 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5970 IncompleteCatchIsInvalid) 5971 Invalid = true; 5972 5973 if (!Invalid && !ExDeclType->isDependentType() && 5974 RequireNonAbstractType(Loc, ExDeclType, 5975 diag::err_abstract_type_in_decl, 5976 AbstractVariableType)) 5977 Invalid = true; 5978 5979 // Only the non-fragile NeXT runtime currently supports C++ catches 5980 // of ObjC types, and no runtime supports catching ObjC types by value. 5981 if (!Invalid && getLangOptions().ObjC1) { 5982 QualType T = ExDeclType; 5983 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5984 T = RT->getPointeeType(); 5985 5986 if (T->isObjCObjectType()) { 5987 Diag(Loc, diag::err_objc_object_catch); 5988 Invalid = true; 5989 } else if (T->isObjCObjectPointerType()) { 5990 if (!getLangOptions().NeXTRuntime) { 5991 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 5992 Invalid = true; 5993 } else if (!getLangOptions().ObjCNonFragileABI) { 5994 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 5995 Invalid = true; 5996 } 5997 } 5998 } 5999 6000 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6001 Name, ExDeclType, TInfo, VarDecl::None, 6002 VarDecl::None); 6003 ExDecl->setExceptionVariable(true); 6004 6005 if (!Invalid) { 6006 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6007 // C++ [except.handle]p16: 6008 // The object declared in an exception-declaration or, if the 6009 // exception-declaration does not specify a name, a temporary (12.2) is 6010 // copy-initialized (8.5) from the exception object. [...] 6011 // The object is destroyed when the handler exits, after the destruction 6012 // of any automatic objects initialized within the handler. 6013 // 6014 // We just pretend to initialize the object with itself, then make sure 6015 // it can be destroyed later. 6016 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6017 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6018 Loc, ExDeclType, 0); 6019 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6020 SourceLocation()); 6021 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6022 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6023 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6024 if (Result.isInvalid()) 6025 Invalid = true; 6026 else 6027 FinalizeVarWithDestructor(ExDecl, RecordTy); 6028 } 6029 } 6030 6031 if (Invalid) 6032 ExDecl->setInvalidDecl(); 6033 6034 return ExDecl; 6035} 6036 6037/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6038/// handler. 6039Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6040 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6041 QualType ExDeclType = TInfo->getType(); 6042 6043 bool Invalid = D.isInvalidType(); 6044 IdentifierInfo *II = D.getIdentifier(); 6045 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6046 LookupOrdinaryName, 6047 ForRedeclaration)) { 6048 // The scope should be freshly made just for us. There is just no way 6049 // it contains any previous declaration. 6050 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6051 if (PrevDecl->isTemplateParameter()) { 6052 // Maybe we will complain about the shadowed template parameter. 6053 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6054 } 6055 } 6056 6057 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6058 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6059 << D.getCXXScopeSpec().getRange(); 6060 Invalid = true; 6061 } 6062 6063 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6064 D.getIdentifier(), 6065 D.getIdentifierLoc(), 6066 D.getDeclSpec().getSourceRange()); 6067 6068 if (Invalid) 6069 ExDecl->setInvalidDecl(); 6070 6071 // Add the exception declaration into this scope. 6072 if (II) 6073 PushOnScopeChains(ExDecl, S); 6074 else 6075 CurContext->addDecl(ExDecl); 6076 6077 ProcessDeclAttributes(S, ExDecl, D); 6078 return DeclPtrTy::make(ExDecl); 6079} 6080 6081Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6082 ExprArg assertexpr, 6083 ExprArg assertmessageexpr) { 6084 Expr *AssertExpr = (Expr *)assertexpr.get(); 6085 StringLiteral *AssertMessage = 6086 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6087 6088 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6089 llvm::APSInt Value(32); 6090 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6091 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6092 AssertExpr->getSourceRange(); 6093 return DeclPtrTy(); 6094 } 6095 6096 if (Value == 0) { 6097 Diag(AssertLoc, diag::err_static_assert_failed) 6098 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6099 } 6100 } 6101 6102 assertexpr.release(); 6103 assertmessageexpr.release(); 6104 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6105 AssertExpr, AssertMessage); 6106 6107 CurContext->addDecl(Decl); 6108 return DeclPtrTy::make(Decl); 6109} 6110 6111/// \brief Perform semantic analysis of the given friend type declaration. 6112/// 6113/// \returns A friend declaration that. 6114FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6115 TypeSourceInfo *TSInfo) { 6116 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6117 6118 QualType T = TSInfo->getType(); 6119 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6120 6121 if (!getLangOptions().CPlusPlus0x) { 6122 // C++03 [class.friend]p2: 6123 // An elaborated-type-specifier shall be used in a friend declaration 6124 // for a class.* 6125 // 6126 // * The class-key of the elaborated-type-specifier is required. 6127 if (!ActiveTemplateInstantiations.empty()) { 6128 // Do not complain about the form of friend template types during 6129 // template instantiation; we will already have complained when the 6130 // template was declared. 6131 } else if (!T->isElaboratedTypeSpecifier()) { 6132 // If we evaluated the type to a record type, suggest putting 6133 // a tag in front. 6134 if (const RecordType *RT = T->getAs<RecordType>()) { 6135 RecordDecl *RD = RT->getDecl(); 6136 6137 std::string InsertionText = std::string(" ") + RD->getKindName(); 6138 6139 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6140 << (unsigned) RD->getTagKind() 6141 << T 6142 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6143 InsertionText); 6144 } else { 6145 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6146 << T 6147 << SourceRange(FriendLoc, TypeRange.getEnd()); 6148 } 6149 } else if (T->getAs<EnumType>()) { 6150 Diag(FriendLoc, diag::ext_enum_friend) 6151 << T 6152 << SourceRange(FriendLoc, TypeRange.getEnd()); 6153 } 6154 } 6155 6156 // C++0x [class.friend]p3: 6157 // If the type specifier in a friend declaration designates a (possibly 6158 // cv-qualified) class type, that class is declared as a friend; otherwise, 6159 // the friend declaration is ignored. 6160 6161 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6162 // in [class.friend]p3 that we do not implement. 6163 6164 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6165} 6166 6167/// Handle a friend type declaration. This works in tandem with 6168/// ActOnTag. 6169/// 6170/// Notes on friend class templates: 6171/// 6172/// We generally treat friend class declarations as if they were 6173/// declaring a class. So, for example, the elaborated type specifier 6174/// in a friend declaration is required to obey the restrictions of a 6175/// class-head (i.e. no typedefs in the scope chain), template 6176/// parameters are required to match up with simple template-ids, &c. 6177/// However, unlike when declaring a template specialization, it's 6178/// okay to refer to a template specialization without an empty 6179/// template parameter declaration, e.g. 6180/// friend class A<T>::B<unsigned>; 6181/// We permit this as a special case; if there are any template 6182/// parameters present at all, require proper matching, i.e. 6183/// template <> template <class T> friend class A<int>::B; 6184Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6185 MultiTemplateParamsArg TempParams) { 6186 SourceLocation Loc = DS.getSourceRange().getBegin(); 6187 6188 assert(DS.isFriendSpecified()); 6189 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6190 6191 // Try to convert the decl specifier to a type. This works for 6192 // friend templates because ActOnTag never produces a ClassTemplateDecl 6193 // for a TUK_Friend. 6194 Declarator TheDeclarator(DS, Declarator::MemberContext); 6195 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6196 QualType T = TSI->getType(); 6197 if (TheDeclarator.isInvalidType()) 6198 return DeclPtrTy(); 6199 6200 // This is definitely an error in C++98. It's probably meant to 6201 // be forbidden in C++0x, too, but the specification is just 6202 // poorly written. 6203 // 6204 // The problem is with declarations like the following: 6205 // template <T> friend A<T>::foo; 6206 // where deciding whether a class C is a friend or not now hinges 6207 // on whether there exists an instantiation of A that causes 6208 // 'foo' to equal C. There are restrictions on class-heads 6209 // (which we declare (by fiat) elaborated friend declarations to 6210 // be) that makes this tractable. 6211 // 6212 // FIXME: handle "template <> friend class A<T>;", which 6213 // is possibly well-formed? Who even knows? 6214 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6215 Diag(Loc, diag::err_tagless_friend_type_template) 6216 << DS.getSourceRange(); 6217 return DeclPtrTy(); 6218 } 6219 6220 // C++98 [class.friend]p1: A friend of a class is a function 6221 // or class that is not a member of the class . . . 6222 // This is fixed in DR77, which just barely didn't make the C++03 6223 // deadline. It's also a very silly restriction that seriously 6224 // affects inner classes and which nobody else seems to implement; 6225 // thus we never diagnose it, not even in -pedantic. 6226 // 6227 // But note that we could warn about it: it's always useless to 6228 // friend one of your own members (it's not, however, worthless to 6229 // friend a member of an arbitrary specialization of your template). 6230 6231 Decl *D; 6232 if (unsigned NumTempParamLists = TempParams.size()) 6233 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6234 NumTempParamLists, 6235 (TemplateParameterList**) TempParams.release(), 6236 TSI, 6237 DS.getFriendSpecLoc()); 6238 else 6239 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6240 6241 if (!D) 6242 return DeclPtrTy(); 6243 6244 D->setAccess(AS_public); 6245 CurContext->addDecl(D); 6246 6247 return DeclPtrTy::make(D); 6248} 6249 6250Sema::DeclPtrTy 6251Sema::ActOnFriendFunctionDecl(Scope *S, 6252 Declarator &D, 6253 bool IsDefinition, 6254 MultiTemplateParamsArg TemplateParams) { 6255 const DeclSpec &DS = D.getDeclSpec(); 6256 6257 assert(DS.isFriendSpecified()); 6258 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6259 6260 SourceLocation Loc = D.getIdentifierLoc(); 6261 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6262 QualType T = TInfo->getType(); 6263 6264 // C++ [class.friend]p1 6265 // A friend of a class is a function or class.... 6266 // Note that this sees through typedefs, which is intended. 6267 // It *doesn't* see through dependent types, which is correct 6268 // according to [temp.arg.type]p3: 6269 // If a declaration acquires a function type through a 6270 // type dependent on a template-parameter and this causes 6271 // a declaration that does not use the syntactic form of a 6272 // function declarator to have a function type, the program 6273 // is ill-formed. 6274 if (!T->isFunctionType()) { 6275 Diag(Loc, diag::err_unexpected_friend); 6276 6277 // It might be worthwhile to try to recover by creating an 6278 // appropriate declaration. 6279 return DeclPtrTy(); 6280 } 6281 6282 // C++ [namespace.memdef]p3 6283 // - If a friend declaration in a non-local class first declares a 6284 // class or function, the friend class or function is a member 6285 // of the innermost enclosing namespace. 6286 // - The name of the friend is not found by simple name lookup 6287 // until a matching declaration is provided in that namespace 6288 // scope (either before or after the class declaration granting 6289 // friendship). 6290 // - If a friend function is called, its name may be found by the 6291 // name lookup that considers functions from namespaces and 6292 // classes associated with the types of the function arguments. 6293 // - When looking for a prior declaration of a class or a function 6294 // declared as a friend, scopes outside the innermost enclosing 6295 // namespace scope are not considered. 6296 6297 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6298 DeclarationName Name = GetNameForDeclarator(D); 6299 assert(Name); 6300 6301 // The context we found the declaration in, or in which we should 6302 // create the declaration. 6303 DeclContext *DC; 6304 6305 // FIXME: handle local classes 6306 6307 // Recover from invalid scope qualifiers as if they just weren't there. 6308 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6309 ForRedeclaration); 6310 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6311 DC = computeDeclContext(ScopeQual); 6312 6313 // FIXME: handle dependent contexts 6314 if (!DC) return DeclPtrTy(); 6315 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6316 6317 LookupQualifiedName(Previous, DC); 6318 6319 // Ignore things found implicitly in the wrong scope. 6320 // TODO: better diagnostics for this case. Suggesting the right 6321 // qualified scope would be nice... 6322 LookupResult::Filter F = Previous.makeFilter(); 6323 while (F.hasNext()) { 6324 NamedDecl *D = F.next(); 6325 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6326 F.erase(); 6327 } 6328 F.done(); 6329 6330 if (Previous.empty()) { 6331 D.setInvalidType(); 6332 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6333 return DeclPtrTy(); 6334 } 6335 6336 // C++ [class.friend]p1: A friend of a class is a function or 6337 // class that is not a member of the class . . . 6338 if (DC->Equals(CurContext)) 6339 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6340 6341 // Otherwise walk out to the nearest namespace scope looking for matches. 6342 } else { 6343 // TODO: handle local class contexts. 6344 6345 DC = CurContext; 6346 while (true) { 6347 // Skip class contexts. If someone can cite chapter and verse 6348 // for this behavior, that would be nice --- it's what GCC and 6349 // EDG do, and it seems like a reasonable intent, but the spec 6350 // really only says that checks for unqualified existing 6351 // declarations should stop at the nearest enclosing namespace, 6352 // not that they should only consider the nearest enclosing 6353 // namespace. 6354 while (DC->isRecord()) 6355 DC = DC->getParent(); 6356 6357 LookupQualifiedName(Previous, DC); 6358 6359 // TODO: decide what we think about using declarations. 6360 if (!Previous.empty()) 6361 break; 6362 6363 if (DC->isFileContext()) break; 6364 DC = DC->getParent(); 6365 } 6366 6367 // C++ [class.friend]p1: A friend of a class is a function or 6368 // class that is not a member of the class . . . 6369 // C++0x changes this for both friend types and functions. 6370 // Most C++ 98 compilers do seem to give an error here, so 6371 // we do, too. 6372 if (!Previous.empty() && DC->Equals(CurContext) 6373 && !getLangOptions().CPlusPlus0x) 6374 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6375 } 6376 6377 if (DC->isFileContext()) { 6378 // This implies that it has to be an operator or function. 6379 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6380 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6381 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6382 Diag(Loc, diag::err_introducing_special_friend) << 6383 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6384 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6385 return DeclPtrTy(); 6386 } 6387 } 6388 6389 bool Redeclaration = false; 6390 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6391 move(TemplateParams), 6392 IsDefinition, 6393 Redeclaration); 6394 if (!ND) return DeclPtrTy(); 6395 6396 assert(ND->getDeclContext() == DC); 6397 assert(ND->getLexicalDeclContext() == CurContext); 6398 6399 // Add the function declaration to the appropriate lookup tables, 6400 // adjusting the redeclarations list as necessary. We don't 6401 // want to do this yet if the friending class is dependent. 6402 // 6403 // Also update the scope-based lookup if the target context's 6404 // lookup context is in lexical scope. 6405 if (!CurContext->isDependentContext()) { 6406 DC = DC->getLookupContext(); 6407 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6408 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6409 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6410 } 6411 6412 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6413 D.getIdentifierLoc(), ND, 6414 DS.getFriendSpecLoc()); 6415 FrD->setAccess(AS_public); 6416 CurContext->addDecl(FrD); 6417 6418 return DeclPtrTy::make(ND); 6419} 6420 6421void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6422 AdjustDeclIfTemplate(dcl); 6423 6424 Decl *Dcl = dcl.getAs<Decl>(); 6425 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6426 if (!Fn) { 6427 Diag(DelLoc, diag::err_deleted_non_function); 6428 return; 6429 } 6430 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6431 Diag(DelLoc, diag::err_deleted_decl_not_first); 6432 Diag(Prev->getLocation(), diag::note_previous_declaration); 6433 // If the declaration wasn't the first, we delete the function anyway for 6434 // recovery. 6435 } 6436 Fn->setDeleted(); 6437} 6438 6439static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6440 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6441 ++CI) { 6442 Stmt *SubStmt = *CI; 6443 if (!SubStmt) 6444 continue; 6445 if (isa<ReturnStmt>(SubStmt)) 6446 Self.Diag(SubStmt->getSourceRange().getBegin(), 6447 diag::err_return_in_constructor_handler); 6448 if (!isa<Expr>(SubStmt)) 6449 SearchForReturnInStmt(Self, SubStmt); 6450 } 6451} 6452 6453void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6454 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6455 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6456 SearchForReturnInStmt(*this, Handler); 6457 } 6458} 6459 6460bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6461 const CXXMethodDecl *Old) { 6462 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6463 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6464 6465 if (Context.hasSameType(NewTy, OldTy) || 6466 NewTy->isDependentType() || OldTy->isDependentType()) 6467 return false; 6468 6469 // Check if the return types are covariant 6470 QualType NewClassTy, OldClassTy; 6471 6472 /// Both types must be pointers or references to classes. 6473 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6474 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6475 NewClassTy = NewPT->getPointeeType(); 6476 OldClassTy = OldPT->getPointeeType(); 6477 } 6478 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6479 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6480 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6481 NewClassTy = NewRT->getPointeeType(); 6482 OldClassTy = OldRT->getPointeeType(); 6483 } 6484 } 6485 } 6486 6487 // The return types aren't either both pointers or references to a class type. 6488 if (NewClassTy.isNull()) { 6489 Diag(New->getLocation(), 6490 diag::err_different_return_type_for_overriding_virtual_function) 6491 << New->getDeclName() << NewTy << OldTy; 6492 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6493 6494 return true; 6495 } 6496 6497 // C++ [class.virtual]p6: 6498 // If the return type of D::f differs from the return type of B::f, the 6499 // class type in the return type of D::f shall be complete at the point of 6500 // declaration of D::f or shall be the class type D. 6501 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6502 if (!RT->isBeingDefined() && 6503 RequireCompleteType(New->getLocation(), NewClassTy, 6504 PDiag(diag::err_covariant_return_incomplete) 6505 << New->getDeclName())) 6506 return true; 6507 } 6508 6509 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6510 // Check if the new class derives from the old class. 6511 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6512 Diag(New->getLocation(), 6513 diag::err_covariant_return_not_derived) 6514 << New->getDeclName() << NewTy << OldTy; 6515 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6516 return true; 6517 } 6518 6519 // Check if we the conversion from derived to base is valid. 6520 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6521 diag::err_covariant_return_inaccessible_base, 6522 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6523 // FIXME: Should this point to the return type? 6524 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6525 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6526 return true; 6527 } 6528 } 6529 6530 // The qualifiers of the return types must be the same. 6531 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6532 Diag(New->getLocation(), 6533 diag::err_covariant_return_type_different_qualifications) 6534 << New->getDeclName() << NewTy << OldTy; 6535 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6536 return true; 6537 }; 6538 6539 6540 // The new class type must have the same or less qualifiers as the old type. 6541 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6542 Diag(New->getLocation(), 6543 diag::err_covariant_return_type_class_type_more_qualified) 6544 << New->getDeclName() << NewTy << OldTy; 6545 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6546 return true; 6547 }; 6548 6549 return false; 6550} 6551 6552bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6553 const CXXMethodDecl *Old) 6554{ 6555 if (Old->hasAttr<FinalAttr>()) { 6556 Diag(New->getLocation(), diag::err_final_function_overridden) 6557 << New->getDeclName(); 6558 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6559 return true; 6560 } 6561 6562 return false; 6563} 6564 6565/// \brief Mark the given method pure. 6566/// 6567/// \param Method the method to be marked pure. 6568/// 6569/// \param InitRange the source range that covers the "0" initializer. 6570bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6571 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6572 Method->setPure(); 6573 6574 // A class is abstract if at least one function is pure virtual. 6575 Method->getParent()->setAbstract(true); 6576 return false; 6577 } 6578 6579 if (!Method->isInvalidDecl()) 6580 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6581 << Method->getDeclName() << InitRange; 6582 return true; 6583} 6584 6585/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6586/// an initializer for the out-of-line declaration 'Dcl'. The scope 6587/// is a fresh scope pushed for just this purpose. 6588/// 6589/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6590/// static data member of class X, names should be looked up in the scope of 6591/// class X. 6592void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6593 // If there is no declaration, there was an error parsing it. 6594 Decl *D = Dcl.getAs<Decl>(); 6595 if (D == 0) return; 6596 6597 // We should only get called for declarations with scope specifiers, like: 6598 // int foo::bar; 6599 assert(D->isOutOfLine()); 6600 EnterDeclaratorContext(S, D->getDeclContext()); 6601} 6602 6603/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6604/// initializer for the out-of-line declaration 'Dcl'. 6605void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6606 // If there is no declaration, there was an error parsing it. 6607 Decl *D = Dcl.getAs<Decl>(); 6608 if (D == 0) return; 6609 6610 assert(D->isOutOfLine()); 6611 ExitDeclaratorContext(S); 6612} 6613 6614/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6615/// C++ if/switch/while/for statement. 6616/// e.g: "if (int x = f()) {...}" 6617Action::DeclResult 6618Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6619 // C++ 6.4p2: 6620 // The declarator shall not specify a function or an array. 6621 // The type-specifier-seq shall not contain typedef and shall not declare a 6622 // new class or enumeration. 6623 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6624 "Parser allowed 'typedef' as storage class of condition decl."); 6625 6626 TagDecl *OwnedTag = 0; 6627 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6628 QualType Ty = TInfo->getType(); 6629 6630 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6631 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6632 // would be created and CXXConditionDeclExpr wants a VarDecl. 6633 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6634 << D.getSourceRange(); 6635 return DeclResult(); 6636 } else if (OwnedTag && OwnedTag->isDefinition()) { 6637 // The type-specifier-seq shall not declare a new class or enumeration. 6638 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6639 } 6640 6641 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6642 if (!Dcl) 6643 return DeclResult(); 6644 6645 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6646 VD->setDeclaredInCondition(true); 6647 return Dcl; 6648} 6649 6650void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6651 bool DefinitionRequired) { 6652 // Ignore any vtable uses in unevaluated operands or for classes that do 6653 // not have a vtable. 6654 if (!Class->isDynamicClass() || Class->isDependentContext() || 6655 CurContext->isDependentContext() || 6656 ExprEvalContexts.back().Context == Unevaluated) 6657 return; 6658 6659 // Try to insert this class into the map. 6660 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6661 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6662 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6663 if (!Pos.second) { 6664 // If we already had an entry, check to see if we are promoting this vtable 6665 // to required a definition. If so, we need to reappend to the VTableUses 6666 // list, since we may have already processed the first entry. 6667 if (DefinitionRequired && !Pos.first->second) { 6668 Pos.first->second = true; 6669 } else { 6670 // Otherwise, we can early exit. 6671 return; 6672 } 6673 } 6674 6675 // Local classes need to have their virtual members marked 6676 // immediately. For all other classes, we mark their virtual members 6677 // at the end of the translation unit. 6678 if (Class->isLocalClass()) 6679 MarkVirtualMembersReferenced(Loc, Class); 6680 else 6681 VTableUses.push_back(std::make_pair(Class, Loc)); 6682} 6683 6684bool Sema::DefineUsedVTables() { 6685 // If any dynamic classes have their key function defined within 6686 // this translation unit, then those vtables are considered "used" and must 6687 // be emitted. 6688 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6689 if (const CXXMethodDecl *KeyFunction 6690 = Context.getKeyFunction(DynamicClasses[I])) { 6691 const FunctionDecl *Definition = 0; 6692 if (KeyFunction->hasBody(Definition)) 6693 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6694 } 6695 } 6696 6697 if (VTableUses.empty()) 6698 return false; 6699 6700 // Note: The VTableUses vector could grow as a result of marking 6701 // the members of a class as "used", so we check the size each 6702 // time through the loop and prefer indices (with are stable) to 6703 // iterators (which are not). 6704 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6705 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6706 if (!Class) 6707 continue; 6708 6709 SourceLocation Loc = VTableUses[I].second; 6710 6711 // If this class has a key function, but that key function is 6712 // defined in another translation unit, we don't need to emit the 6713 // vtable even though we're using it. 6714 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6715 if (KeyFunction && !KeyFunction->hasBody()) { 6716 switch (KeyFunction->getTemplateSpecializationKind()) { 6717 case TSK_Undeclared: 6718 case TSK_ExplicitSpecialization: 6719 case TSK_ExplicitInstantiationDeclaration: 6720 // The key function is in another translation unit. 6721 continue; 6722 6723 case TSK_ExplicitInstantiationDefinition: 6724 case TSK_ImplicitInstantiation: 6725 // We will be instantiating the key function. 6726 break; 6727 } 6728 } else if (!KeyFunction) { 6729 // If we have a class with no key function that is the subject 6730 // of an explicit instantiation declaration, suppress the 6731 // vtable; it will live with the explicit instantiation 6732 // definition. 6733 bool IsExplicitInstantiationDeclaration 6734 = Class->getTemplateSpecializationKind() 6735 == TSK_ExplicitInstantiationDeclaration; 6736 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6737 REnd = Class->redecls_end(); 6738 R != REnd; ++R) { 6739 TemplateSpecializationKind TSK 6740 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6741 if (TSK == TSK_ExplicitInstantiationDeclaration) 6742 IsExplicitInstantiationDeclaration = true; 6743 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6744 IsExplicitInstantiationDeclaration = false; 6745 break; 6746 } 6747 } 6748 6749 if (IsExplicitInstantiationDeclaration) 6750 continue; 6751 } 6752 6753 // Mark all of the virtual members of this class as referenced, so 6754 // that we can build a vtable. Then, tell the AST consumer that a 6755 // vtable for this class is required. 6756 MarkVirtualMembersReferenced(Loc, Class); 6757 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6758 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6759 6760 // Optionally warn if we're emitting a weak vtable. 6761 if (Class->getLinkage() == ExternalLinkage && 6762 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6763 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6764 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6765 } 6766 } 6767 VTableUses.clear(); 6768 6769 return true; 6770} 6771 6772void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6773 const CXXRecordDecl *RD) { 6774 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6775 e = RD->method_end(); i != e; ++i) { 6776 CXXMethodDecl *MD = *i; 6777 6778 // C++ [basic.def.odr]p2: 6779 // [...] A virtual member function is used if it is not pure. [...] 6780 if (MD->isVirtual() && !MD->isPure()) 6781 MarkDeclarationReferenced(Loc, MD); 6782 } 6783 6784 // Only classes that have virtual bases need a VTT. 6785 if (RD->getNumVBases() == 0) 6786 return; 6787 6788 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6789 e = RD->bases_end(); i != e; ++i) { 6790 const CXXRecordDecl *Base = 6791 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6792 if (i->isVirtual()) 6793 continue; 6794 if (Base->getNumVBases() == 0) 6795 continue; 6796 MarkVirtualMembersReferenced(Loc, Base); 6797 } 6798} 6799 6800/// SetIvarInitializers - This routine builds initialization ASTs for the 6801/// Objective-C implementation whose ivars need be initialized. 6802void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6803 if (!getLangOptions().CPlusPlus) 6804 return; 6805 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6806 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6807 CollectIvarsToConstructOrDestruct(OID, ivars); 6808 if (ivars.empty()) 6809 return; 6810 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6811 for (unsigned i = 0; i < ivars.size(); i++) { 6812 FieldDecl *Field = ivars[i]; 6813 if (Field->isInvalidDecl()) 6814 continue; 6815 6816 CXXBaseOrMemberInitializer *Member; 6817 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6818 InitializationKind InitKind = 6819 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6820 6821 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6822 Sema::OwningExprResult MemberInit = 6823 InitSeq.Perform(*this, InitEntity, InitKind, 6824 Sema::MultiExprArg(*this, 0, 0)); 6825 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6826 // Note, MemberInit could actually come back empty if no initialization 6827 // is required (e.g., because it would call a trivial default constructor) 6828 if (!MemberInit.get() || MemberInit.isInvalid()) 6829 continue; 6830 6831 Member = 6832 new (Context) CXXBaseOrMemberInitializer(Context, 6833 Field, SourceLocation(), 6834 SourceLocation(), 6835 MemberInit.takeAs<Expr>(), 6836 SourceLocation()); 6837 AllToInit.push_back(Member); 6838 6839 // Be sure that the destructor is accessible and is marked as referenced. 6840 if (const RecordType *RecordTy 6841 = Context.getBaseElementType(Field->getType()) 6842 ->getAs<RecordType>()) { 6843 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6844 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6845 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6846 CheckDestructorAccess(Field->getLocation(), Destructor, 6847 PDiag(diag::err_access_dtor_ivar) 6848 << Context.getBaseElementType(Field->getType())); 6849 } 6850 } 6851 } 6852 ObjCImplementation->setIvarInitializers(Context, 6853 AllToInit.data(), AllToInit.size()); 6854 } 6855} 6856