SemaDeclCXX.cpp revision 86ff308724171494395a840fd2efbe25e62f352e
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/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 if (OldParam->hasUninstantiatedDefaultArg()) 302 NewParam->setUninstantiatedDefaultArg( 303 OldParam->getUninstantiatedDefaultArg()); 304 else 305 NewParam->setDefaultArg(OldParam->getDefaultArg()); 306 } else if (NewParam->hasDefaultArg()) { 307 if (New->getDescribedFunctionTemplate()) { 308 // Paragraph 4, quoted above, only applies to non-template functions. 309 Diag(NewParam->getLocation(), 310 diag::err_param_default_argument_template_redecl) 311 << NewParam->getDefaultArgRange(); 312 Diag(Old->getLocation(), diag::note_template_prev_declaration) 313 << false; 314 } else if (New->getTemplateSpecializationKind() 315 != TSK_ImplicitInstantiation && 316 New->getTemplateSpecializationKind() != TSK_Undeclared) { 317 // C++ [temp.expr.spec]p21: 318 // Default function arguments shall not be specified in a declaration 319 // or a definition for one of the following explicit specializations: 320 // - the explicit specialization of a function template; 321 // - the explicit specialization of a member function template; 322 // - the explicit specialization of a member function of a class 323 // template where the class template specialization to which the 324 // member function specialization belongs is implicitly 325 // instantiated. 326 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 327 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 328 << New->getDeclName() 329 << NewParam->getDefaultArgRange(); 330 } else if (New->getDeclContext()->isDependentContext()) { 331 // C++ [dcl.fct.default]p6 (DR217): 332 // Default arguments for a member function of a class template shall 333 // be specified on the initial declaration of the member function 334 // within the class template. 335 // 336 // Reading the tea leaves a bit in DR217 and its reference to DR205 337 // leads me to the conclusion that one cannot add default function 338 // arguments for an out-of-line definition of a member function of a 339 // dependent type. 340 int WhichKind = 2; 341 if (CXXRecordDecl *Record 342 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 343 if (Record->getDescribedClassTemplate()) 344 WhichKind = 0; 345 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 346 WhichKind = 1; 347 else 348 WhichKind = 2; 349 } 350 351 Diag(NewParam->getLocation(), 352 diag::err_param_default_argument_member_template_redecl) 353 << WhichKind 354 << NewParam->getDefaultArgRange(); 355 } 356 } 357 } 358 359 if (CheckEquivalentExceptionSpec( 360 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 361 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 362 Invalid = true; 363 364 return Invalid; 365} 366 367/// CheckCXXDefaultArguments - Verify that the default arguments for a 368/// function declaration are well-formed according to C++ 369/// [dcl.fct.default]. 370void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 371 unsigned NumParams = FD->getNumParams(); 372 unsigned p; 373 374 // Find first parameter with a default argument 375 for (p = 0; p < NumParams; ++p) { 376 ParmVarDecl *Param = FD->getParamDecl(p); 377 if (Param->hasDefaultArg()) 378 break; 379 } 380 381 // C++ [dcl.fct.default]p4: 382 // In a given function declaration, all parameters 383 // subsequent to a parameter with a default argument shall 384 // have default arguments supplied in this or previous 385 // declarations. A default argument shall not be redefined 386 // by a later declaration (not even to the same value). 387 unsigned LastMissingDefaultArg = 0; 388 for (; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (!Param->hasDefaultArg()) { 391 if (Param->isInvalidDecl()) 392 /* We already complained about this parameter. */; 393 else if (Param->getIdentifier()) 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing_name) 396 << Param->getIdentifier(); 397 else 398 Diag(Param->getLocation(), 399 diag::err_param_default_argument_missing); 400 401 LastMissingDefaultArg = p; 402 } 403 } 404 405 if (LastMissingDefaultArg > 0) { 406 // Some default arguments were missing. Clear out all of the 407 // default arguments up to (and including) the last missing 408 // default argument, so that we leave the function parameters 409 // in a semantically valid state. 410 for (p = 0; p <= LastMissingDefaultArg; ++p) { 411 ParmVarDecl *Param = FD->getParamDecl(p); 412 if (Param->hasDefaultArg()) { 413 if (!Param->hasUnparsedDefaultArg()) 414 Param->getDefaultArg()->Destroy(Context); 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) 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 QualType BaseType, 451 SourceLocation BaseLoc) { 452 // C++ [class.union]p1: 453 // A union shall not have base classes. 454 if (Class->isUnion()) { 455 Diag(Class->getLocation(), diag::err_base_clause_on_union) 456 << SpecifierRange; 457 return 0; 458 } 459 460 if (BaseType->isDependentType()) 461 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 462 Class->getTagKind() == RecordDecl::TK_class, 463 Access, BaseType); 464 465 // Base specifiers must be record types. 466 if (!BaseType->isRecordType()) { 467 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 468 return 0; 469 } 470 471 // C++ [class.union]p1: 472 // A union shall not be used as a base class. 473 if (BaseType->isUnionType()) { 474 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 475 return 0; 476 } 477 478 // C++ [class.derived]p2: 479 // The class-name in a base-specifier shall not be an incompletely 480 // defined class. 481 if (RequireCompleteType(BaseLoc, BaseType, 482 PDiag(diag::err_incomplete_base_class) 483 << SpecifierRange)) 484 return 0; 485 486 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 487 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 488 assert(BaseDecl && "Record type has no declaration"); 489 BaseDecl = BaseDecl->getDefinition(Context); 490 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 491 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 492 assert(CXXBaseDecl && "Base type is not a C++ type"); 493 494 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 495 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 496 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 497 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 498 << BaseType; 499 return 0; 500 } 501 502 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 503 504 // Create the base specifier. 505 // FIXME: Allocate via ASTContext? 506 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 507 Class->getTagKind() == RecordDecl::TK_class, 508 Access, BaseType); 509} 510 511void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 512 const CXXRecordDecl *BaseClass, 513 bool BaseIsVirtual) { 514 // A class with a non-empty base class is not empty. 515 // FIXME: Standard ref? 516 if (!BaseClass->isEmpty()) 517 Class->setEmpty(false); 518 519 // C++ [class.virtual]p1: 520 // A class that [...] inherits a virtual function is called a polymorphic 521 // class. 522 if (BaseClass->isPolymorphic()) 523 Class->setPolymorphic(true); 524 525 // C++ [dcl.init.aggr]p1: 526 // An aggregate is [...] a class with [...] no base classes [...]. 527 Class->setAggregate(false); 528 529 // C++ [class]p4: 530 // A POD-struct is an aggregate class... 531 Class->setPOD(false); 532 533 if (BaseIsVirtual) { 534 // C++ [class.ctor]p5: 535 // A constructor is trivial if its class has no virtual base classes. 536 Class->setHasTrivialConstructor(false); 537 538 // C++ [class.copy]p6: 539 // A copy constructor is trivial if its class has no virtual base classes. 540 Class->setHasTrivialCopyConstructor(false); 541 542 // C++ [class.copy]p11: 543 // A copy assignment operator is trivial if its class has no virtual 544 // base classes. 545 Class->setHasTrivialCopyAssignment(false); 546 547 // C++0x [meta.unary.prop] is_empty: 548 // T is a class type, but not a union type, with ... no virtual base 549 // classes 550 Class->setEmpty(false); 551 } else { 552 // C++ [class.ctor]p5: 553 // A constructor is trivial if all the direct base classes of its 554 // class have trivial constructors. 555 if (!BaseClass->hasTrivialConstructor()) 556 Class->setHasTrivialConstructor(false); 557 558 // C++ [class.copy]p6: 559 // A copy constructor is trivial if all the direct base classes of its 560 // class have trivial copy constructors. 561 if (!BaseClass->hasTrivialCopyConstructor()) 562 Class->setHasTrivialCopyConstructor(false); 563 564 // C++ [class.copy]p11: 565 // A copy assignment operator is trivial if all the direct base classes 566 // of its class have trivial copy assignment operators. 567 if (!BaseClass->hasTrivialCopyAssignment()) 568 Class->setHasTrivialCopyAssignment(false); 569 } 570 571 // C++ [class.ctor]p3: 572 // A destructor is trivial if all the direct base classes of its class 573 // have trivial destructors. 574 if (!BaseClass->hasTrivialDestructor()) 575 Class->setHasTrivialDestructor(false); 576} 577 578/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 579/// one entry in the base class list of a class specifier, for 580/// example: 581/// class foo : public bar, virtual private baz { 582/// 'public bar' and 'virtual private baz' are each base-specifiers. 583Sema::BaseResult 584Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 585 bool Virtual, AccessSpecifier Access, 586 TypeTy *basetype, SourceLocation BaseLoc) { 587 if (!classdecl) 588 return true; 589 590 AdjustDeclIfTemplate(classdecl); 591 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 592 QualType BaseType = GetTypeFromParser(basetype); 593 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 594 Virtual, Access, 595 BaseType, BaseLoc)) 596 return BaseSpec; 597 598 return true; 599} 600 601/// \brief Performs the actual work of attaching the given base class 602/// specifiers to a C++ class. 603bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 604 unsigned NumBases) { 605 if (NumBases == 0) 606 return false; 607 608 // Used to keep track of which base types we have already seen, so 609 // that we can properly diagnose redundant direct base types. Note 610 // that the key is always the unqualified canonical type of the base 611 // class. 612 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 613 614 // Copy non-redundant base specifiers into permanent storage. 615 unsigned NumGoodBases = 0; 616 bool Invalid = false; 617 for (unsigned idx = 0; idx < NumBases; ++idx) { 618 QualType NewBaseType 619 = Context.getCanonicalType(Bases[idx]->getType()); 620 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 621 622 if (KnownBaseTypes[NewBaseType]) { 623 // C++ [class.mi]p3: 624 // A class shall not be specified as a direct base class of a 625 // derived class more than once. 626 Diag(Bases[idx]->getSourceRange().getBegin(), 627 diag::err_duplicate_base_class) 628 << KnownBaseTypes[NewBaseType]->getType() 629 << Bases[idx]->getSourceRange(); 630 631 // Delete the duplicate base class specifier; we're going to 632 // overwrite its pointer later. 633 Context.Deallocate(Bases[idx]); 634 635 Invalid = true; 636 } else { 637 // Okay, add this new base class. 638 KnownBaseTypes[NewBaseType] = Bases[idx]; 639 Bases[NumGoodBases++] = Bases[idx]; 640 } 641 } 642 643 // Attach the remaining base class specifiers to the derived class. 644 Class->setBases(Context, Bases, NumGoodBases); 645 646 // Delete the remaining (good) base class specifiers, since their 647 // data has been copied into the CXXRecordDecl. 648 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 649 Context.Deallocate(Bases[idx]); 650 651 return Invalid; 652} 653 654/// ActOnBaseSpecifiers - Attach the given base specifiers to the 655/// class, after checking whether there are any duplicate base 656/// classes. 657void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 658 unsigned NumBases) { 659 if (!ClassDecl || !Bases || !NumBases) 660 return; 661 662 AdjustDeclIfTemplate(ClassDecl); 663 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 664 (CXXBaseSpecifier**)(Bases), NumBases); 665} 666 667/// \brief Determine whether the type \p Derived is a C++ class that is 668/// derived from the type \p Base. 669bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 670 if (!getLangOptions().CPlusPlus) 671 return false; 672 673 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 674 if (!DerivedRT) 675 return false; 676 677 const RecordType *BaseRT = Base->getAs<RecordType>(); 678 if (!BaseRT) 679 return false; 680 681 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 682 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 683 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 684 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 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, CXXBasePaths &Paths) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 694 if (!DerivedRT) 695 return false; 696 697 const RecordType *BaseRT = Base->getAs<RecordType>(); 698 if (!BaseRT) 699 return false; 700 701 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 702 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 703 return DerivedRD->isDerivedFrom(BaseRD, Paths); 704} 705 706/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 707/// conversion (where Derived and Base are class types) is 708/// well-formed, meaning that the conversion is unambiguous (and 709/// that all of the base classes are accessible). Returns true 710/// and emits a diagnostic if the code is ill-formed, returns false 711/// otherwise. Loc is the location where this routine should point to 712/// if there is an error, and Range is the source range to highlight 713/// if there is an error. 714bool 715Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 716 unsigned InaccessibleBaseID, 717 unsigned AmbigiousBaseConvID, 718 SourceLocation Loc, SourceRange Range, 719 DeclarationName Name) { 720 // First, determine whether the path from Derived to Base is 721 // ambiguous. This is slightly more expensive than checking whether 722 // the Derived to Base conversion exists, because here we need to 723 // explore multiple paths to determine if there is an ambiguity. 724 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 725 /*DetectVirtual=*/false); 726 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 727 assert(DerivationOkay && 728 "Can only be used with a derived-to-base conversion"); 729 (void)DerivationOkay; 730 731 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 732 if (InaccessibleBaseID == 0) 733 return false; 734 // Check that the base class can be accessed. 735 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 736 Name); 737 } 738 739 // We know that the derived-to-base conversion is ambiguous, and 740 // we're going to produce a diagnostic. Perform the derived-to-base 741 // search just one more time to compute all of the possible paths so 742 // that we can print them out. This is more expensive than any of 743 // the previous derived-to-base checks we've done, but at this point 744 // performance isn't as much of an issue. 745 Paths.clear(); 746 Paths.setRecordingPaths(true); 747 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 748 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 749 (void)StillOkay; 750 751 // Build up a textual representation of the ambiguous paths, e.g., 752 // D -> B -> A, that will be used to illustrate the ambiguous 753 // conversions in the diagnostic. We only print one of the paths 754 // to each base class subobject. 755 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 756 757 Diag(Loc, AmbigiousBaseConvID) 758 << Derived << Base << PathDisplayStr << Range << Name; 759 return true; 760} 761 762bool 763Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 764 SourceLocation Loc, SourceRange Range, 765 bool IgnoreAccess) { 766 return CheckDerivedToBaseConversion(Derived, Base, 767 IgnoreAccess ? 0 : 768 diag::err_conv_to_inaccessible_base, 769 diag::err_ambiguous_derived_to_base_conv, 770 Loc, Range, DeclarationName()); 771} 772 773 774/// @brief Builds a string representing ambiguous paths from a 775/// specific derived class to different subobjects of the same base 776/// class. 777/// 778/// This function builds a string that can be used in error messages 779/// to show the different paths that one can take through the 780/// inheritance hierarchy to go from the derived class to different 781/// subobjects of a base class. The result looks something like this: 782/// @code 783/// struct D -> struct B -> struct A 784/// struct D -> struct C -> struct A 785/// @endcode 786std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 787 std::string PathDisplayStr; 788 std::set<unsigned> DisplayedPaths; 789 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 790 Path != Paths.end(); ++Path) { 791 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 792 // We haven't displayed a path to this particular base 793 // class subobject yet. 794 PathDisplayStr += "\n "; 795 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 796 for (CXXBasePath::const_iterator Element = Path->begin(); 797 Element != Path->end(); ++Element) 798 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 799 } 800 } 801 802 return PathDisplayStr; 803} 804 805//===----------------------------------------------------------------------===// 806// C++ class member Handling 807//===----------------------------------------------------------------------===// 808 809/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 810/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 811/// bitfield width if there is one and 'InitExpr' specifies the initializer if 812/// any. 813Sema::DeclPtrTy 814Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 815 MultiTemplateParamsArg TemplateParameterLists, 816 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 817 bool Deleted) { 818 const DeclSpec &DS = D.getDeclSpec(); 819 DeclarationName Name = GetNameForDeclarator(D); 820 Expr *BitWidth = static_cast<Expr*>(BW); 821 Expr *Init = static_cast<Expr*>(InitExpr); 822 SourceLocation Loc = D.getIdentifierLoc(); 823 824 bool isFunc = D.isFunctionDeclarator(); 825 826 assert(!DS.isFriendSpecified()); 827 828 // C++ 9.2p6: A member shall not be declared to have automatic storage 829 // duration (auto, register) or with the extern storage-class-specifier. 830 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 831 // data members and cannot be applied to names declared const or static, 832 // and cannot be applied to reference members. 833 switch (DS.getStorageClassSpec()) { 834 case DeclSpec::SCS_unspecified: 835 case DeclSpec::SCS_typedef: 836 case DeclSpec::SCS_static: 837 // FALL THROUGH. 838 break; 839 case DeclSpec::SCS_mutable: 840 if (isFunc) { 841 if (DS.getStorageClassSpecLoc().isValid()) 842 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 843 else 844 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 845 846 // FIXME: It would be nicer if the keyword was ignored only for this 847 // declarator. Otherwise we could get follow-up errors. 848 D.getMutableDeclSpec().ClearStorageClassSpecs(); 849 } else { 850 QualType T = GetTypeForDeclarator(D, S); 851 diag::kind err = static_cast<diag::kind>(0); 852 if (T->isReferenceType()) 853 err = diag::err_mutable_reference; 854 else if (T.isConstQualified()) 855 err = diag::err_mutable_const; 856 if (err != 0) { 857 if (DS.getStorageClassSpecLoc().isValid()) 858 Diag(DS.getStorageClassSpecLoc(), err); 859 else 860 Diag(DS.getThreadSpecLoc(), err); 861 // FIXME: It would be nicer if the keyword was ignored only for this 862 // declarator. Otherwise we could get follow-up errors. 863 D.getMutableDeclSpec().ClearStorageClassSpecs(); 864 } 865 } 866 break; 867 default: 868 if (DS.getStorageClassSpecLoc().isValid()) 869 Diag(DS.getStorageClassSpecLoc(), 870 diag::err_storageclass_invalid_for_member); 871 else 872 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 873 D.getMutableDeclSpec().ClearStorageClassSpecs(); 874 } 875 876 if (!isFunc && 877 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 878 D.getNumTypeObjects() == 0) { 879 // Check also for this case: 880 // 881 // typedef int f(); 882 // f a; 883 // 884 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 885 isFunc = TDType->isFunctionType(); 886 } 887 888 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 889 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 890 !isFunc); 891 892 Decl *Member; 893 if (isInstField) { 894 // FIXME: Check for template parameters! 895 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 896 AS); 897 assert(Member && "HandleField never returns null"); 898 } else { 899 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 900 .getAs<Decl>(); 901 if (!Member) { 902 if (BitWidth) DeleteExpr(BitWidth); 903 return DeclPtrTy(); 904 } 905 906 // Non-instance-fields can't have a bitfield. 907 if (BitWidth) { 908 if (Member->isInvalidDecl()) { 909 // don't emit another diagnostic. 910 } else if (isa<VarDecl>(Member)) { 911 // C++ 9.6p3: A bit-field shall not be a static member. 912 // "static member 'A' cannot be a bit-field" 913 Diag(Loc, diag::err_static_not_bitfield) 914 << Name << BitWidth->getSourceRange(); 915 } else if (isa<TypedefDecl>(Member)) { 916 // "typedef member 'x' cannot be a bit-field" 917 Diag(Loc, diag::err_typedef_not_bitfield) 918 << Name << BitWidth->getSourceRange(); 919 } else { 920 // A function typedef ("typedef int f(); f a;"). 921 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 922 Diag(Loc, diag::err_not_integral_type_bitfield) 923 << Name << cast<ValueDecl>(Member)->getType() 924 << BitWidth->getSourceRange(); 925 } 926 927 DeleteExpr(BitWidth); 928 BitWidth = 0; 929 Member->setInvalidDecl(); 930 } 931 932 Member->setAccess(AS); 933 934 // If we have declared a member function template, set the access of the 935 // templated declaration as well. 936 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 937 FunTmpl->getTemplatedDecl()->setAccess(AS); 938 } 939 940 assert((Name || isInstField) && "No identifier for non-field ?"); 941 942 if (Init) 943 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 944 if (Deleted) // FIXME: Source location is not very good. 945 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 946 947 if (isInstField) { 948 FieldCollector->Add(cast<FieldDecl>(Member)); 949 return DeclPtrTy(); 950 } 951 return DeclPtrTy::make(Member); 952} 953 954/// \brief Find the direct and/or virtual base specifiers that 955/// correspond to the given base type, for use in base initialization 956/// within a constructor. 957static bool FindBaseInitializer(Sema &SemaRef, 958 CXXRecordDecl *ClassDecl, 959 QualType BaseType, 960 const CXXBaseSpecifier *&DirectBaseSpec, 961 const CXXBaseSpecifier *&VirtualBaseSpec) { 962 // First, check for a direct base class. 963 DirectBaseSpec = 0; 964 for (CXXRecordDecl::base_class_const_iterator Base 965 = ClassDecl->bases_begin(); 966 Base != ClassDecl->bases_end(); ++Base) { 967 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 968 // We found a direct base of this type. That's what we're 969 // initializing. 970 DirectBaseSpec = &*Base; 971 break; 972 } 973 } 974 975 // Check for a virtual base class. 976 // FIXME: We might be able to short-circuit this if we know in advance that 977 // there are no virtual bases. 978 VirtualBaseSpec = 0; 979 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 980 // We haven't found a base yet; search the class hierarchy for a 981 // virtual base class. 982 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 983 /*DetectVirtual=*/false); 984 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 985 BaseType, Paths)) { 986 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 987 Path != Paths.end(); ++Path) { 988 if (Path->back().Base->isVirtual()) { 989 VirtualBaseSpec = Path->back().Base; 990 break; 991 } 992 } 993 } 994 } 995 996 return DirectBaseSpec || VirtualBaseSpec; 997} 998 999/// ActOnMemInitializer - Handle a C++ member initializer. 1000Sema::MemInitResult 1001Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1002 Scope *S, 1003 const CXXScopeSpec &SS, 1004 IdentifierInfo *MemberOrBase, 1005 TypeTy *TemplateTypeTy, 1006 SourceLocation IdLoc, 1007 SourceLocation LParenLoc, 1008 ExprTy **Args, unsigned NumArgs, 1009 SourceLocation *CommaLocs, 1010 SourceLocation RParenLoc) { 1011 if (!ConstructorD) 1012 return true; 1013 1014 AdjustDeclIfTemplate(ConstructorD); 1015 1016 CXXConstructorDecl *Constructor 1017 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1018 if (!Constructor) { 1019 // The user wrote a constructor initializer on a function that is 1020 // not a C++ constructor. Ignore the error for now, because we may 1021 // have more member initializers coming; we'll diagnose it just 1022 // once in ActOnMemInitializers. 1023 return true; 1024 } 1025 1026 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1027 1028 // C++ [class.base.init]p2: 1029 // Names in a mem-initializer-id are looked up in the scope of the 1030 // constructor’s class and, if not found in that scope, are looked 1031 // up in the scope containing the constructor’s 1032 // definition. [Note: if the constructor’s class contains a member 1033 // with the same name as a direct or virtual base class of the 1034 // class, a mem-initializer-id naming the member or base class and 1035 // composed of a single identifier refers to the class member. A 1036 // mem-initializer-id for the hidden base class may be specified 1037 // using a qualified name. ] 1038 if (!SS.getScopeRep() && !TemplateTypeTy) { 1039 // Look for a member, first. 1040 FieldDecl *Member = 0; 1041 DeclContext::lookup_result Result 1042 = ClassDecl->lookup(MemberOrBase); 1043 if (Result.first != Result.second) 1044 Member = dyn_cast<FieldDecl>(*Result.first); 1045 1046 // FIXME: Handle members of an anonymous union. 1047 1048 if (Member) 1049 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1050 LParenLoc, RParenLoc); 1051 } 1052 // It didn't name a member, so see if it names a class. 1053 QualType BaseType; 1054 TypeSourceInfo *TInfo = 0; 1055 1056 if (TemplateTypeTy) { 1057 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1058 } else { 1059 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1060 LookupParsedName(R, S, &SS); 1061 1062 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1063 if (!TyD) { 1064 if (R.isAmbiguous()) return true; 1065 1066 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1067 bool NotUnknownSpecialization = false; 1068 DeclContext *DC = computeDeclContext(SS, false); 1069 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1070 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1071 1072 if (!NotUnknownSpecialization) { 1073 // When the scope specifier can refer to a member of an unknown 1074 // specialization, we take it as a type name. 1075 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1076 *MemberOrBase, SS.getRange()); 1077 R.clear(); 1078 } 1079 } 1080 1081 // If no results were found, try to correct typos. 1082 if (R.empty() && BaseType.isNull() && 1083 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1084 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1085 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1086 // We have found a non-static data member with a similar 1087 // name to what was typed; complain and initialize that 1088 // member. 1089 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1090 << MemberOrBase << true << R.getLookupName() 1091 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1092 R.getLookupName().getAsString()); 1093 Diag(Member->getLocation(), diag::note_previous_decl) 1094 << Member->getDeclName(); 1095 1096 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1097 LParenLoc, RParenLoc); 1098 } 1099 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1100 const CXXBaseSpecifier *DirectBaseSpec; 1101 const CXXBaseSpecifier *VirtualBaseSpec; 1102 if (FindBaseInitializer(*this, ClassDecl, 1103 Context.getTypeDeclType(Type), 1104 DirectBaseSpec, VirtualBaseSpec)) { 1105 // We have found a direct or virtual base class with a 1106 // similar name to what was typed; complain and initialize 1107 // that base class. 1108 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1109 << MemberOrBase << false << R.getLookupName() 1110 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1111 R.getLookupName().getAsString()); 1112 1113 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1114 : VirtualBaseSpec; 1115 Diag(BaseSpec->getSourceRange().getBegin(), 1116 diag::note_base_class_specified_here) 1117 << BaseSpec->getType() 1118 << BaseSpec->getSourceRange(); 1119 1120 TyD = Type; 1121 } 1122 } 1123 } 1124 1125 if (!TyD && BaseType.isNull()) { 1126 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1127 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1128 return true; 1129 } 1130 } 1131 1132 if (BaseType.isNull()) { 1133 BaseType = Context.getTypeDeclType(TyD); 1134 if (SS.isSet()) { 1135 NestedNameSpecifier *Qualifier = 1136 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1137 1138 // FIXME: preserve source range information 1139 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1140 } 1141 } 1142 } 1143 1144 if (!TInfo) 1145 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1146 1147 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1148 LParenLoc, RParenLoc, ClassDecl); 1149} 1150 1151/// Checks an initializer expression for use of uninitialized fields, such as 1152/// containing the field that is being initialized. Returns true if there is an 1153/// uninitialized field was used an updates the SourceLocation parameter; false 1154/// otherwise. 1155static bool InitExprContainsUninitializedFields(const Stmt* S, 1156 const FieldDecl* LhsField, 1157 SourceLocation* L) { 1158 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1159 if (ME) { 1160 const NamedDecl* RhsField = ME->getMemberDecl(); 1161 if (RhsField == LhsField) { 1162 // Initializing a field with itself. Throw a warning. 1163 // But wait; there are exceptions! 1164 // Exception #1: The field may not belong to this record. 1165 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1166 const Expr* base = ME->getBase(); 1167 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1168 // Even though the field matches, it does not belong to this record. 1169 return false; 1170 } 1171 // None of the exceptions triggered; return true to indicate an 1172 // uninitialized field was used. 1173 *L = ME->getMemberLoc(); 1174 return true; 1175 } 1176 } 1177 bool found = false; 1178 for (Stmt::const_child_iterator it = S->child_begin(); 1179 it != S->child_end() && found == false; 1180 ++it) { 1181 if (isa<CallExpr>(S)) { 1182 // Do not descend into function calls or constructors, as the use 1183 // of an uninitialized field may be valid. One would have to inspect 1184 // the contents of the function/ctor to determine if it is safe or not. 1185 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1186 // may be safe, depending on what the function/ctor does. 1187 continue; 1188 } 1189 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1190 } 1191 return found; 1192} 1193 1194Sema::MemInitResult 1195Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1196 unsigned NumArgs, SourceLocation IdLoc, 1197 SourceLocation LParenLoc, 1198 SourceLocation RParenLoc) { 1199 // Diagnose value-uses of fields to initialize themselves, e.g. 1200 // foo(foo) 1201 // where foo is not also a parameter to the constructor. 1202 // TODO: implement -Wuninitialized and fold this into that framework. 1203 for (unsigned i = 0; i < NumArgs; ++i) { 1204 SourceLocation L; 1205 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1206 // FIXME: Return true in the case when other fields are used before being 1207 // uninitialized. For example, let this field be the i'th field. When 1208 // initializing the i'th field, throw a warning if any of the >= i'th 1209 // fields are used, as they are not yet initialized. 1210 // Right now we are only handling the case where the i'th field uses 1211 // itself in its initializer. 1212 Diag(L, diag::warn_field_is_uninit); 1213 } 1214 } 1215 1216 bool HasDependentArg = false; 1217 for (unsigned i = 0; i < NumArgs; i++) 1218 HasDependentArg |= Args[i]->isTypeDependent(); 1219 1220 QualType FieldType = Member->getType(); 1221 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1222 FieldType = Array->getElementType(); 1223 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1224 if (FieldType->isDependentType() || HasDependentArg) { 1225 // Can't check initialization for a member of dependent type or when 1226 // any of the arguments are type-dependent expressions. 1227 OwningExprResult Init 1228 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1229 RParenLoc)); 1230 1231 // Erase any temporaries within this evaluation context; we're not 1232 // going to track them in the AST, since we'll be rebuilding the 1233 // ASTs during template instantiation. 1234 ExprTemporaries.erase( 1235 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1236 ExprTemporaries.end()); 1237 1238 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1239 LParenLoc, 1240 Init.takeAs<Expr>(), 1241 RParenLoc); 1242 1243 } 1244 1245 if (Member->isInvalidDecl()) 1246 return true; 1247 1248 // Initialize the member. 1249 InitializedEntity MemberEntity = 1250 InitializedEntity::InitializeMember(Member, 0); 1251 InitializationKind Kind = 1252 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1253 1254 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1255 1256 OwningExprResult MemberInit = 1257 InitSeq.Perform(*this, MemberEntity, Kind, 1258 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1259 if (MemberInit.isInvalid()) 1260 return true; 1261 1262 // C++0x [class.base.init]p7: 1263 // The initialization of each base and member constitutes a 1264 // full-expression. 1265 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1266 if (MemberInit.isInvalid()) 1267 return true; 1268 1269 // If we are in a dependent context, template instantiation will 1270 // perform this type-checking again. Just save the arguments that we 1271 // received in a ParenListExpr. 1272 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1273 // of the information that we have about the member 1274 // initializer. However, deconstructing the ASTs is a dicey process, 1275 // and this approach is far more likely to get the corner cases right. 1276 if (CurContext->isDependentContext()) { 1277 // Bump the reference count of all of the arguments. 1278 for (unsigned I = 0; I != NumArgs; ++I) 1279 Args[I]->Retain(); 1280 1281 OwningExprResult Init 1282 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1283 RParenLoc)); 1284 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1285 LParenLoc, 1286 Init.takeAs<Expr>(), 1287 RParenLoc); 1288 } 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 MemberInit.takeAs<Expr>(), 1293 RParenLoc); 1294} 1295 1296Sema::MemInitResult 1297Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1298 Expr **Args, unsigned NumArgs, 1299 SourceLocation LParenLoc, SourceLocation RParenLoc, 1300 CXXRecordDecl *ClassDecl) { 1301 bool HasDependentArg = false; 1302 for (unsigned i = 0; i < NumArgs; i++) 1303 HasDependentArg |= Args[i]->isTypeDependent(); 1304 1305 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1306 if (BaseType->isDependentType() || HasDependentArg) { 1307 // Can't check initialization for a base of dependent type or when 1308 // any of the arguments are type-dependent expressions. 1309 OwningExprResult BaseInit 1310 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1311 RParenLoc)); 1312 1313 // Erase any temporaries within this evaluation context; we're not 1314 // going to track them in the AST, since we'll be rebuilding the 1315 // ASTs during template instantiation. 1316 ExprTemporaries.erase( 1317 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1318 ExprTemporaries.end()); 1319 1320 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1321 LParenLoc, 1322 BaseInit.takeAs<Expr>(), 1323 RParenLoc); 1324 } 1325 1326 if (!BaseType->isRecordType()) 1327 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1328 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1329 1330 // C++ [class.base.init]p2: 1331 // [...] Unless the mem-initializer-id names a nonstatic data 1332 // member of the constructor’s class or a direct or virtual base 1333 // of that class, the mem-initializer is ill-formed. A 1334 // mem-initializer-list can initialize a base class using any 1335 // name that denotes that base class type. 1336 1337 // Check for direct and virtual base classes. 1338 const CXXBaseSpecifier *DirectBaseSpec = 0; 1339 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1340 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1341 VirtualBaseSpec); 1342 1343 // C++ [base.class.init]p2: 1344 // If a mem-initializer-id is ambiguous because it designates both 1345 // a direct non-virtual base class and an inherited virtual base 1346 // class, the mem-initializer is ill-formed. 1347 if (DirectBaseSpec && VirtualBaseSpec) 1348 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1349 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1350 // C++ [base.class.init]p2: 1351 // Unless the mem-initializer-id names a nonstatic data membeer of the 1352 // constructor's class ot a direst or virtual base of that class, the 1353 // mem-initializer is ill-formed. 1354 if (!DirectBaseSpec && !VirtualBaseSpec) 1355 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1356 << BaseType << ClassDecl->getNameAsCString() 1357 << BaseTInfo->getTypeLoc().getSourceRange(); 1358 1359 CXXBaseSpecifier *BaseSpec 1360 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1361 if (!BaseSpec) 1362 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1363 1364 // Initialize the base. 1365 InitializedEntity BaseEntity = 1366 InitializedEntity::InitializeBase(Context, BaseSpec); 1367 InitializationKind Kind = 1368 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1369 1370 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1371 1372 OwningExprResult BaseInit = 1373 InitSeq.Perform(*this, BaseEntity, Kind, 1374 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1375 if (BaseInit.isInvalid()) 1376 return true; 1377 1378 // C++0x [class.base.init]p7: 1379 // The initialization of each base and member constitutes a 1380 // full-expression. 1381 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1382 if (BaseInit.isInvalid()) 1383 return true; 1384 1385 // If we are in a dependent context, template instantiation will 1386 // perform this type-checking again. Just save the arguments that we 1387 // received in a ParenListExpr. 1388 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1389 // of the information that we have about the base 1390 // initializer. However, deconstructing the ASTs is a dicey process, 1391 // and this approach is far more likely to get the corner cases right. 1392 if (CurContext->isDependentContext()) { 1393 // Bump the reference count of all of the arguments. 1394 for (unsigned I = 0; I != NumArgs; ++I) 1395 Args[I]->Retain(); 1396 1397 OwningExprResult Init 1398 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1399 RParenLoc)); 1400 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1401 LParenLoc, 1402 Init.takeAs<Expr>(), 1403 RParenLoc); 1404 } 1405 1406 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1407 LParenLoc, 1408 BaseInit.takeAs<Expr>(), 1409 RParenLoc); 1410} 1411 1412bool 1413Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1414 CXXBaseOrMemberInitializer **Initializers, 1415 unsigned NumInitializers, 1416 bool IsImplicitConstructor, 1417 bool AnyErrors) { 1418 // We need to build the initializer AST according to order of construction 1419 // and not what user specified in the Initializers list. 1420 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1421 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1422 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1423 bool HasDependentBaseInit = false; 1424 bool HadError = false; 1425 1426 for (unsigned i = 0; i < NumInitializers; i++) { 1427 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1428 if (Member->isBaseInitializer()) { 1429 if (Member->getBaseClass()->isDependentType()) 1430 HasDependentBaseInit = true; 1431 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1432 } else { 1433 AllBaseFields[Member->getMember()] = Member; 1434 } 1435 } 1436 1437 if (HasDependentBaseInit) { 1438 // FIXME. This does not preserve the ordering of the initializers. 1439 // Try (with -Wreorder) 1440 // template<class X> struct A {}; 1441 // template<class X> struct B : A<X> { 1442 // B() : x1(10), A<X>() {} 1443 // int x1; 1444 // }; 1445 // B<int> x; 1446 // On seeing one dependent type, we should essentially exit this routine 1447 // while preserving user-declared initializer list. When this routine is 1448 // called during instantiatiation process, this routine will rebuild the 1449 // ordered initializer list correctly. 1450 1451 // If we have a dependent base initialization, we can't determine the 1452 // association between initializers and bases; just dump the known 1453 // initializers into the list, and don't try to deal with other bases. 1454 for (unsigned i = 0; i < NumInitializers; i++) { 1455 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1456 if (Member->isBaseInitializer()) 1457 AllToInit.push_back(Member); 1458 } 1459 } else { 1460 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1461 1462 // Push virtual bases before others. 1463 for (CXXRecordDecl::base_class_iterator VBase = 1464 ClassDecl->vbases_begin(), 1465 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1466 if (VBase->getType()->isDependentType()) 1467 continue; 1468 if (CXXBaseOrMemberInitializer *Value 1469 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1470 AllToInit.push_back(Value); 1471 } else if (!AnyErrors) { 1472 InitializedEntity InitEntity 1473 = InitializedEntity::InitializeBase(Context, VBase); 1474 InitializationKind InitKind 1475 = InitializationKind::CreateDefault(Constructor->getLocation()); 1476 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1477 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1478 MultiExprArg(*this, 0, 0)); 1479 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1480 if (BaseInit.isInvalid()) { 1481 HadError = true; 1482 continue; 1483 } 1484 1485 // Don't attach synthesized base initializers in a dependent 1486 // context; they'll be checked again at template instantiation 1487 // time. 1488 if (CurContext->isDependentContext()) 1489 continue; 1490 1491 CXXBaseOrMemberInitializer *CXXBaseInit = 1492 new (Context) CXXBaseOrMemberInitializer(Context, 1493 Context.getTrivialTypeSourceInfo(VBase->getType(), 1494 SourceLocation()), 1495 SourceLocation(), 1496 BaseInit.takeAs<Expr>(), 1497 SourceLocation()); 1498 AllToInit.push_back(CXXBaseInit); 1499 } 1500 } 1501 1502 for (CXXRecordDecl::base_class_iterator Base = 1503 ClassDecl->bases_begin(), 1504 E = ClassDecl->bases_end(); Base != E; ++Base) { 1505 // Virtuals are in the virtual base list and already constructed. 1506 if (Base->isVirtual()) 1507 continue; 1508 // Skip dependent types. 1509 if (Base->getType()->isDependentType()) 1510 continue; 1511 if (CXXBaseOrMemberInitializer *Value 1512 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1513 AllToInit.push_back(Value); 1514 } 1515 else if (!AnyErrors) { 1516 InitializedEntity InitEntity 1517 = InitializedEntity::InitializeBase(Context, Base); 1518 InitializationKind InitKind 1519 = InitializationKind::CreateDefault(Constructor->getLocation()); 1520 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1521 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1522 MultiExprArg(*this, 0, 0)); 1523 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1524 if (BaseInit.isInvalid()) { 1525 HadError = true; 1526 continue; 1527 } 1528 1529 // Don't attach synthesized base initializers in a dependent 1530 // context; they'll be regenerated at template instantiation 1531 // time. 1532 if (CurContext->isDependentContext()) 1533 continue; 1534 1535 CXXBaseOrMemberInitializer *CXXBaseInit = 1536 new (Context) CXXBaseOrMemberInitializer(Context, 1537 Context.getTrivialTypeSourceInfo(Base->getType(), 1538 SourceLocation()), 1539 SourceLocation(), 1540 BaseInit.takeAs<Expr>(), 1541 SourceLocation()); 1542 AllToInit.push_back(CXXBaseInit); 1543 } 1544 } 1545 } 1546 1547 // non-static data members. 1548 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1549 E = ClassDecl->field_end(); Field != E; ++Field) { 1550 if ((*Field)->isAnonymousStructOrUnion()) { 1551 if (const RecordType *FieldClassType = 1552 Field->getType()->getAs<RecordType>()) { 1553 CXXRecordDecl *FieldClassDecl 1554 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1555 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1556 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1557 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1558 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1559 // set to the anonymous union data member used in the initializer 1560 // list. 1561 Value->setMember(*Field); 1562 Value->setAnonUnionMember(*FA); 1563 AllToInit.push_back(Value); 1564 break; 1565 } 1566 } 1567 } 1568 continue; 1569 } 1570 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1571 AllToInit.push_back(Value); 1572 continue; 1573 } 1574 1575 if ((*Field)->getType()->isDependentType() || AnyErrors) 1576 continue; 1577 1578 QualType FT = Context.getBaseElementType((*Field)->getType()); 1579 if (FT->getAs<RecordType>()) { 1580 InitializedEntity InitEntity 1581 = InitializedEntity::InitializeMember(*Field); 1582 InitializationKind InitKind 1583 = InitializationKind::CreateDefault(Constructor->getLocation()); 1584 1585 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1586 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1587 MultiExprArg(*this, 0, 0)); 1588 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1589 if (MemberInit.isInvalid()) { 1590 HadError = true; 1591 continue; 1592 } 1593 1594 // Don't attach synthesized member initializers in a dependent 1595 // context; they'll be regenerated a template instantiation 1596 // time. 1597 if (CurContext->isDependentContext()) 1598 continue; 1599 1600 CXXBaseOrMemberInitializer *Member = 1601 new (Context) CXXBaseOrMemberInitializer(Context, 1602 *Field, SourceLocation(), 1603 SourceLocation(), 1604 MemberInit.takeAs<Expr>(), 1605 SourceLocation()); 1606 1607 AllToInit.push_back(Member); 1608 } 1609 else if (FT->isReferenceType()) { 1610 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1611 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1612 << 0 << (*Field)->getDeclName(); 1613 Diag((*Field)->getLocation(), diag::note_declared_at); 1614 HadError = true; 1615 } 1616 else if (FT.isConstQualified()) { 1617 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1618 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1619 << 1 << (*Field)->getDeclName(); 1620 Diag((*Field)->getLocation(), diag::note_declared_at); 1621 HadError = true; 1622 } 1623 } 1624 1625 NumInitializers = AllToInit.size(); 1626 if (NumInitializers > 0) { 1627 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1628 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1629 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1630 1631 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1632 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1633 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1634 } 1635 1636 return HadError; 1637} 1638 1639static void *GetKeyForTopLevelField(FieldDecl *Field) { 1640 // For anonymous unions, use the class declaration as the key. 1641 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1642 if (RT->getDecl()->isAnonymousStructOrUnion()) 1643 return static_cast<void *>(RT->getDecl()); 1644 } 1645 return static_cast<void *>(Field); 1646} 1647 1648static void *GetKeyForBase(QualType BaseType) { 1649 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1650 return (void *)RT; 1651 1652 assert(0 && "Unexpected base type!"); 1653 return 0; 1654} 1655 1656static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1657 bool MemberMaybeAnon = false) { 1658 // For fields injected into the class via declaration of an anonymous union, 1659 // use its anonymous union class declaration as the unique key. 1660 if (Member->isMemberInitializer()) { 1661 FieldDecl *Field = Member->getMember(); 1662 1663 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1664 // data member of the class. Data member used in the initializer list is 1665 // in AnonUnionMember field. 1666 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1667 Field = Member->getAnonUnionMember(); 1668 if (Field->getDeclContext()->isRecord()) { 1669 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1670 if (RD->isAnonymousStructOrUnion()) 1671 return static_cast<void *>(RD); 1672 } 1673 return static_cast<void *>(Field); 1674 } 1675 1676 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1677} 1678 1679/// ActOnMemInitializers - Handle the member initializers for a constructor. 1680void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1681 SourceLocation ColonLoc, 1682 MemInitTy **MemInits, unsigned NumMemInits, 1683 bool AnyErrors) { 1684 if (!ConstructorDecl) 1685 return; 1686 1687 AdjustDeclIfTemplate(ConstructorDecl); 1688 1689 CXXConstructorDecl *Constructor 1690 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1691 1692 if (!Constructor) { 1693 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1694 return; 1695 } 1696 1697 if (!Constructor->isDependentContext()) { 1698 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1699 bool err = false; 1700 for (unsigned i = 0; i < NumMemInits; i++) { 1701 CXXBaseOrMemberInitializer *Member = 1702 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1703 void *KeyToMember = GetKeyForMember(Member); 1704 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1705 if (!PrevMember) { 1706 PrevMember = Member; 1707 continue; 1708 } 1709 if (FieldDecl *Field = Member->getMember()) 1710 Diag(Member->getSourceLocation(), 1711 diag::error_multiple_mem_initialization) 1712 << Field->getNameAsString() 1713 << Member->getSourceRange(); 1714 else { 1715 Type *BaseClass = Member->getBaseClass(); 1716 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1717 Diag(Member->getSourceLocation(), 1718 diag::error_multiple_base_initialization) 1719 << QualType(BaseClass, 0) 1720 << Member->getSourceRange(); 1721 } 1722 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1723 << 0; 1724 err = true; 1725 } 1726 1727 if (err) 1728 return; 1729 } 1730 1731 SetBaseOrMemberInitializers(Constructor, 1732 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1733 NumMemInits, false, AnyErrors); 1734 1735 if (Constructor->isDependentContext()) 1736 return; 1737 1738 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1739 Diagnostic::Ignored && 1740 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1741 Diagnostic::Ignored) 1742 return; 1743 1744 // Also issue warning if order of ctor-initializer list does not match order 1745 // of 1) base class declarations and 2) order of non-static data members. 1746 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1747 1748 CXXRecordDecl *ClassDecl 1749 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1750 // Push virtual bases before others. 1751 for (CXXRecordDecl::base_class_iterator VBase = 1752 ClassDecl->vbases_begin(), 1753 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1754 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1755 1756 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1757 E = ClassDecl->bases_end(); Base != E; ++Base) { 1758 // Virtuals are alread in the virtual base list and are constructed 1759 // first. 1760 if (Base->isVirtual()) 1761 continue; 1762 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1763 } 1764 1765 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1766 E = ClassDecl->field_end(); Field != E; ++Field) 1767 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1768 1769 int Last = AllBaseOrMembers.size(); 1770 int curIndex = 0; 1771 CXXBaseOrMemberInitializer *PrevMember = 0; 1772 for (unsigned i = 0; i < NumMemInits; i++) { 1773 CXXBaseOrMemberInitializer *Member = 1774 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1775 void *MemberInCtorList = GetKeyForMember(Member, true); 1776 1777 for (; curIndex < Last; curIndex++) 1778 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1779 break; 1780 if (curIndex == Last) { 1781 assert(PrevMember && "Member not in member list?!"); 1782 // Initializer as specified in ctor-initializer list is out of order. 1783 // Issue a warning diagnostic. 1784 if (PrevMember->isBaseInitializer()) { 1785 // Diagnostics is for an initialized base class. 1786 Type *BaseClass = PrevMember->getBaseClass(); 1787 Diag(PrevMember->getSourceLocation(), 1788 diag::warn_base_initialized) 1789 << QualType(BaseClass, 0); 1790 } else { 1791 FieldDecl *Field = PrevMember->getMember(); 1792 Diag(PrevMember->getSourceLocation(), 1793 diag::warn_field_initialized) 1794 << Field->getNameAsString(); 1795 } 1796 // Also the note! 1797 if (FieldDecl *Field = Member->getMember()) 1798 Diag(Member->getSourceLocation(), 1799 diag::note_fieldorbase_initialized_here) << 0 1800 << Field->getNameAsString(); 1801 else { 1802 Type *BaseClass = Member->getBaseClass(); 1803 Diag(Member->getSourceLocation(), 1804 diag::note_fieldorbase_initialized_here) << 1 1805 << QualType(BaseClass, 0); 1806 } 1807 for (curIndex = 0; curIndex < Last; curIndex++) 1808 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1809 break; 1810 } 1811 PrevMember = Member; 1812 } 1813} 1814 1815void 1816Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1817 // Ignore dependent destructors. 1818 if (Destructor->isDependentContext()) 1819 return; 1820 1821 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1822 1823 // Non-static data members. 1824 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1825 E = ClassDecl->field_end(); I != E; ++I) { 1826 FieldDecl *Field = *I; 1827 1828 QualType FieldType = Context.getBaseElementType(Field->getType()); 1829 1830 const RecordType* RT = FieldType->getAs<RecordType>(); 1831 if (!RT) 1832 continue; 1833 1834 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1835 if (FieldClassDecl->hasTrivialDestructor()) 1836 continue; 1837 1838 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1839 MarkDeclarationReferenced(Destructor->getLocation(), 1840 const_cast<CXXDestructorDecl*>(Dtor)); 1841 } 1842 1843 // Bases. 1844 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1845 E = ClassDecl->bases_end(); Base != E; ++Base) { 1846 // Ignore virtual bases. 1847 if (Base->isVirtual()) 1848 continue; 1849 1850 // Ignore trivial destructors. 1851 CXXRecordDecl *BaseClassDecl 1852 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1853 if (BaseClassDecl->hasTrivialDestructor()) 1854 continue; 1855 1856 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1857 MarkDeclarationReferenced(Destructor->getLocation(), 1858 const_cast<CXXDestructorDecl*>(Dtor)); 1859 } 1860 1861 // Virtual bases. 1862 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1863 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1864 // Ignore trivial destructors. 1865 CXXRecordDecl *BaseClassDecl 1866 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1867 if (BaseClassDecl->hasTrivialDestructor()) 1868 continue; 1869 1870 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1871 MarkDeclarationReferenced(Destructor->getLocation(), 1872 const_cast<CXXDestructorDecl*>(Dtor)); 1873 } 1874} 1875 1876void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1877 if (!CDtorDecl) 1878 return; 1879 1880 AdjustDeclIfTemplate(CDtorDecl); 1881 1882 if (CXXConstructorDecl *Constructor 1883 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1884 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1885} 1886 1887namespace { 1888 /// PureVirtualMethodCollector - traverses a class and its superclasses 1889 /// and determines if it has any pure virtual methods. 1890 class PureVirtualMethodCollector { 1891 ASTContext &Context; 1892 1893 public: 1894 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1895 1896 private: 1897 MethodList Methods; 1898 1899 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1900 1901 public: 1902 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1903 : Context(Ctx) { 1904 1905 MethodList List; 1906 Collect(RD, List); 1907 1908 // Copy the temporary list to methods, and make sure to ignore any 1909 // null entries. 1910 for (size_t i = 0, e = List.size(); i != e; ++i) { 1911 if (List[i]) 1912 Methods.push_back(List[i]); 1913 } 1914 } 1915 1916 bool empty() const { return Methods.empty(); } 1917 1918 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1919 MethodList::const_iterator methods_end() { return Methods.end(); } 1920 }; 1921 1922 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1923 MethodList& Methods) { 1924 // First, collect the pure virtual methods for the base classes. 1925 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1926 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1927 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1928 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1929 if (BaseDecl && BaseDecl->isAbstract()) 1930 Collect(BaseDecl, Methods); 1931 } 1932 } 1933 1934 // Next, zero out any pure virtual methods that this class overrides. 1935 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1936 1937 MethodSetTy OverriddenMethods; 1938 size_t MethodsSize = Methods.size(); 1939 1940 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1941 i != e; ++i) { 1942 // Traverse the record, looking for methods. 1943 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1944 // If the method is pure virtual, add it to the methods vector. 1945 if (MD->isPure()) 1946 Methods.push_back(MD); 1947 1948 // Record all the overridden methods in our set. 1949 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1950 E = MD->end_overridden_methods(); I != E; ++I) { 1951 // Keep track of the overridden methods. 1952 OverriddenMethods.insert(*I); 1953 } 1954 } 1955 } 1956 1957 // Now go through the methods and zero out all the ones we know are 1958 // overridden. 1959 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1960 if (OverriddenMethods.count(Methods[i])) 1961 Methods[i] = 0; 1962 } 1963 1964 } 1965} 1966 1967 1968bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1969 unsigned DiagID, AbstractDiagSelID SelID, 1970 const CXXRecordDecl *CurrentRD) { 1971 if (SelID == -1) 1972 return RequireNonAbstractType(Loc, T, 1973 PDiag(DiagID), CurrentRD); 1974 else 1975 return RequireNonAbstractType(Loc, T, 1976 PDiag(DiagID) << SelID, CurrentRD); 1977} 1978 1979bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1980 const PartialDiagnostic &PD, 1981 const CXXRecordDecl *CurrentRD) { 1982 if (!getLangOptions().CPlusPlus) 1983 return false; 1984 1985 if (const ArrayType *AT = Context.getAsArrayType(T)) 1986 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1987 CurrentRD); 1988 1989 if (const PointerType *PT = T->getAs<PointerType>()) { 1990 // Find the innermost pointer type. 1991 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1992 PT = T; 1993 1994 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1995 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1996 } 1997 1998 const RecordType *RT = T->getAs<RecordType>(); 1999 if (!RT) 2000 return false; 2001 2002 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2003 2004 if (CurrentRD && CurrentRD != RD) 2005 return false; 2006 2007 // FIXME: is this reasonable? It matches current behavior, but.... 2008 if (!RD->getDefinition(Context)) 2009 return false; 2010 2011 if (!RD->isAbstract()) 2012 return false; 2013 2014 Diag(Loc, PD) << RD->getDeclName(); 2015 2016 // Check if we've already emitted the list of pure virtual functions for this 2017 // class. 2018 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2019 return true; 2020 2021 PureVirtualMethodCollector Collector(Context, RD); 2022 2023 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2024 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2025 const CXXMethodDecl *MD = *I; 2026 2027 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2028 MD->getDeclName(); 2029 } 2030 2031 if (!PureVirtualClassDiagSet) 2032 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2033 PureVirtualClassDiagSet->insert(RD); 2034 2035 return true; 2036} 2037 2038namespace { 2039 class AbstractClassUsageDiagnoser 2040 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2041 Sema &SemaRef; 2042 CXXRecordDecl *AbstractClass; 2043 2044 bool VisitDeclContext(const DeclContext *DC) { 2045 bool Invalid = false; 2046 2047 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2048 E = DC->decls_end(); I != E; ++I) 2049 Invalid |= Visit(*I); 2050 2051 return Invalid; 2052 } 2053 2054 public: 2055 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2056 : SemaRef(SemaRef), AbstractClass(ac) { 2057 Visit(SemaRef.Context.getTranslationUnitDecl()); 2058 } 2059 2060 bool VisitFunctionDecl(const FunctionDecl *FD) { 2061 if (FD->isThisDeclarationADefinition()) { 2062 // No need to do the check if we're in a definition, because it requires 2063 // that the return/param types are complete. 2064 // because that requires 2065 return VisitDeclContext(FD); 2066 } 2067 2068 // Check the return type. 2069 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2070 bool Invalid = 2071 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2072 diag::err_abstract_type_in_decl, 2073 Sema::AbstractReturnType, 2074 AbstractClass); 2075 2076 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2077 E = FD->param_end(); I != E; ++I) { 2078 const ParmVarDecl *VD = *I; 2079 Invalid |= 2080 SemaRef.RequireNonAbstractType(VD->getLocation(), 2081 VD->getOriginalType(), 2082 diag::err_abstract_type_in_decl, 2083 Sema::AbstractParamType, 2084 AbstractClass); 2085 } 2086 2087 return Invalid; 2088 } 2089 2090 bool VisitDecl(const Decl* D) { 2091 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2092 return VisitDeclContext(DC); 2093 2094 return false; 2095 } 2096 }; 2097} 2098 2099/// \brief Perform semantic checks on a class definition that has been 2100/// completing, introducing implicitly-declared members, checking for 2101/// abstract types, etc. 2102void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2103 if (!Record || Record->isInvalidDecl()) 2104 return; 2105 2106 if (!Record->isDependentType()) 2107 AddImplicitlyDeclaredMembersToClass(Record); 2108 2109 if (Record->isInvalidDecl()) 2110 return; 2111 2112 // Set access bits correctly on the directly-declared conversions. 2113 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2114 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2115 Convs->setAccess(I, (*I)->getAccess()); 2116 2117 if (!Record->isAbstract()) { 2118 // Collect all the pure virtual methods and see if this is an abstract 2119 // class after all. 2120 PureVirtualMethodCollector Collector(Context, Record); 2121 if (!Collector.empty()) 2122 Record->setAbstract(true); 2123 } 2124 2125 if (Record->isAbstract()) 2126 (void)AbstractClassUsageDiagnoser(*this, Record); 2127} 2128 2129void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2130 DeclPtrTy TagDecl, 2131 SourceLocation LBrac, 2132 SourceLocation RBrac) { 2133 if (!TagDecl) 2134 return; 2135 2136 AdjustDeclIfTemplate(TagDecl); 2137 2138 ActOnFields(S, RLoc, TagDecl, 2139 (DeclPtrTy*)FieldCollector->getCurFields(), 2140 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2141 2142 CheckCompletedCXXClass( 2143 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2144} 2145 2146/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2147/// special functions, such as the default constructor, copy 2148/// constructor, or destructor, to the given C++ class (C++ 2149/// [special]p1). This routine can only be executed just before the 2150/// definition of the class is complete. 2151void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2152 CanQualType ClassType 2153 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2154 2155 // FIXME: Implicit declarations have exception specifications, which are 2156 // the union of the specifications of the implicitly called functions. 2157 2158 if (!ClassDecl->hasUserDeclaredConstructor()) { 2159 // C++ [class.ctor]p5: 2160 // A default constructor for a class X is a constructor of class X 2161 // that can be called without an argument. If there is no 2162 // user-declared constructor for class X, a default constructor is 2163 // implicitly declared. An implicitly-declared default constructor 2164 // is an inline public member of its class. 2165 DeclarationName Name 2166 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2167 CXXConstructorDecl *DefaultCon = 2168 CXXConstructorDecl::Create(Context, ClassDecl, 2169 ClassDecl->getLocation(), Name, 2170 Context.getFunctionType(Context.VoidTy, 2171 0, 0, false, 0), 2172 /*TInfo=*/0, 2173 /*isExplicit=*/false, 2174 /*isInline=*/true, 2175 /*isImplicitlyDeclared=*/true); 2176 DefaultCon->setAccess(AS_public); 2177 DefaultCon->setImplicit(); 2178 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2179 ClassDecl->addDecl(DefaultCon); 2180 } 2181 2182 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2183 // C++ [class.copy]p4: 2184 // If the class definition does not explicitly declare a copy 2185 // constructor, one is declared implicitly. 2186 2187 // C++ [class.copy]p5: 2188 // The implicitly-declared copy constructor for a class X will 2189 // have the form 2190 // 2191 // X::X(const X&) 2192 // 2193 // if 2194 bool HasConstCopyConstructor = true; 2195 2196 // -- each direct or virtual base class B of X has a copy 2197 // constructor whose first parameter is of type const B& or 2198 // const volatile B&, and 2199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2200 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2201 const CXXRecordDecl *BaseClassDecl 2202 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2203 HasConstCopyConstructor 2204 = BaseClassDecl->hasConstCopyConstructor(Context); 2205 } 2206 2207 // -- for all the nonstatic data members of X that are of a 2208 // class type M (or array thereof), each such class type 2209 // has a copy constructor whose first parameter is of type 2210 // const M& or const volatile M&. 2211 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2212 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2213 ++Field) { 2214 QualType FieldType = (*Field)->getType(); 2215 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2216 FieldType = Array->getElementType(); 2217 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2218 const CXXRecordDecl *FieldClassDecl 2219 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2220 HasConstCopyConstructor 2221 = FieldClassDecl->hasConstCopyConstructor(Context); 2222 } 2223 } 2224 2225 // Otherwise, the implicitly declared copy constructor will have 2226 // the form 2227 // 2228 // X::X(X&) 2229 QualType ArgType = ClassType; 2230 if (HasConstCopyConstructor) 2231 ArgType = ArgType.withConst(); 2232 ArgType = Context.getLValueReferenceType(ArgType); 2233 2234 // An implicitly-declared copy constructor is an inline public 2235 // member of its class. 2236 DeclarationName Name 2237 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2238 CXXConstructorDecl *CopyConstructor 2239 = CXXConstructorDecl::Create(Context, ClassDecl, 2240 ClassDecl->getLocation(), Name, 2241 Context.getFunctionType(Context.VoidTy, 2242 &ArgType, 1, 2243 false, 0), 2244 /*TInfo=*/0, 2245 /*isExplicit=*/false, 2246 /*isInline=*/true, 2247 /*isImplicitlyDeclared=*/true); 2248 CopyConstructor->setAccess(AS_public); 2249 CopyConstructor->setImplicit(); 2250 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2251 2252 // Add the parameter to the constructor. 2253 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2254 ClassDecl->getLocation(), 2255 /*IdentifierInfo=*/0, 2256 ArgType, /*TInfo=*/0, 2257 VarDecl::None, 0); 2258 CopyConstructor->setParams(Context, &FromParam, 1); 2259 ClassDecl->addDecl(CopyConstructor); 2260 } 2261 2262 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2263 // Note: The following rules are largely analoguous to the copy 2264 // constructor rules. Note that virtual bases are not taken into account 2265 // for determining the argument type of the operator. Note also that 2266 // operators taking an object instead of a reference are allowed. 2267 // 2268 // C++ [class.copy]p10: 2269 // If the class definition does not explicitly declare a copy 2270 // assignment operator, one is declared implicitly. 2271 // The implicitly-defined copy assignment operator for a class X 2272 // will have the form 2273 // 2274 // X& X::operator=(const X&) 2275 // 2276 // if 2277 bool HasConstCopyAssignment = true; 2278 2279 // -- each direct base class B of X has a copy assignment operator 2280 // whose parameter is of type const B&, const volatile B& or B, 2281 // and 2282 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2283 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2284 assert(!Base->getType()->isDependentType() && 2285 "Cannot generate implicit members for class with dependent bases."); 2286 const CXXRecordDecl *BaseClassDecl 2287 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2288 const CXXMethodDecl *MD = 0; 2289 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2290 MD); 2291 } 2292 2293 // -- for all the nonstatic data members of X that are of a class 2294 // type M (or array thereof), each such class type has a copy 2295 // assignment operator whose parameter is of type const M&, 2296 // const volatile M& or M. 2297 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2298 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2299 ++Field) { 2300 QualType FieldType = (*Field)->getType(); 2301 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2302 FieldType = Array->getElementType(); 2303 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2304 const CXXRecordDecl *FieldClassDecl 2305 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2306 const CXXMethodDecl *MD = 0; 2307 HasConstCopyAssignment 2308 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2309 } 2310 } 2311 2312 // Otherwise, the implicitly declared copy assignment operator will 2313 // have the form 2314 // 2315 // X& X::operator=(X&) 2316 QualType ArgType = ClassType; 2317 QualType RetType = Context.getLValueReferenceType(ArgType); 2318 if (HasConstCopyAssignment) 2319 ArgType = ArgType.withConst(); 2320 ArgType = Context.getLValueReferenceType(ArgType); 2321 2322 // An implicitly-declared copy assignment operator is an inline public 2323 // member of its class. 2324 DeclarationName Name = 2325 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2326 CXXMethodDecl *CopyAssignment = 2327 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2328 Context.getFunctionType(RetType, &ArgType, 1, 2329 false, 0), 2330 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2331 CopyAssignment->setAccess(AS_public); 2332 CopyAssignment->setImplicit(); 2333 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2334 CopyAssignment->setCopyAssignment(true); 2335 2336 // Add the parameter to the operator. 2337 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2338 ClassDecl->getLocation(), 2339 /*IdentifierInfo=*/0, 2340 ArgType, /*TInfo=*/0, 2341 VarDecl::None, 0); 2342 CopyAssignment->setParams(Context, &FromParam, 1); 2343 2344 // Don't call addedAssignmentOperator. There is no way to distinguish an 2345 // implicit from an explicit assignment operator. 2346 ClassDecl->addDecl(CopyAssignment); 2347 AddOverriddenMethods(ClassDecl, CopyAssignment); 2348 } 2349 2350 if (!ClassDecl->hasUserDeclaredDestructor()) { 2351 // C++ [class.dtor]p2: 2352 // If a class has no user-declared destructor, a destructor is 2353 // declared implicitly. An implicitly-declared destructor is an 2354 // inline public member of its class. 2355 DeclarationName Name 2356 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2357 CXXDestructorDecl *Destructor 2358 = CXXDestructorDecl::Create(Context, ClassDecl, 2359 ClassDecl->getLocation(), Name, 2360 Context.getFunctionType(Context.VoidTy, 2361 0, 0, false, 0), 2362 /*isInline=*/true, 2363 /*isImplicitlyDeclared=*/true); 2364 Destructor->setAccess(AS_public); 2365 Destructor->setImplicit(); 2366 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2367 ClassDecl->addDecl(Destructor); 2368 2369 AddOverriddenMethods(ClassDecl, Destructor); 2370 } 2371} 2372 2373void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2374 Decl *D = TemplateD.getAs<Decl>(); 2375 if (!D) 2376 return; 2377 2378 TemplateParameterList *Params = 0; 2379 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2380 Params = Template->getTemplateParameters(); 2381 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2382 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2383 Params = PartialSpec->getTemplateParameters(); 2384 else 2385 return; 2386 2387 for (TemplateParameterList::iterator Param = Params->begin(), 2388 ParamEnd = Params->end(); 2389 Param != ParamEnd; ++Param) { 2390 NamedDecl *Named = cast<NamedDecl>(*Param); 2391 if (Named->getDeclName()) { 2392 S->AddDecl(DeclPtrTy::make(Named)); 2393 IdResolver.AddDecl(Named); 2394 } 2395 } 2396} 2397 2398void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2399 if (!RecordD) return; 2400 AdjustDeclIfTemplate(RecordD); 2401 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2402 PushDeclContext(S, Record); 2403} 2404 2405void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2406 if (!RecordD) return; 2407 PopDeclContext(); 2408} 2409 2410/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2411/// parsing a top-level (non-nested) C++ class, and we are now 2412/// parsing those parts of the given Method declaration that could 2413/// not be parsed earlier (C++ [class.mem]p2), such as default 2414/// arguments. This action should enter the scope of the given 2415/// Method declaration as if we had just parsed the qualified method 2416/// name. However, it should not bring the parameters into scope; 2417/// that will be performed by ActOnDelayedCXXMethodParameter. 2418void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2419} 2420 2421/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2422/// C++ method declaration. We're (re-)introducing the given 2423/// function parameter into scope for use in parsing later parts of 2424/// the method declaration. For example, we could see an 2425/// ActOnParamDefaultArgument event for this parameter. 2426void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2427 if (!ParamD) 2428 return; 2429 2430 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2431 2432 // If this parameter has an unparsed default argument, clear it out 2433 // to make way for the parsed default argument. 2434 if (Param->hasUnparsedDefaultArg()) 2435 Param->setDefaultArg(0); 2436 2437 S->AddDecl(DeclPtrTy::make(Param)); 2438 if (Param->getDeclName()) 2439 IdResolver.AddDecl(Param); 2440} 2441 2442/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2443/// processing the delayed method declaration for Method. The method 2444/// declaration is now considered finished. There may be a separate 2445/// ActOnStartOfFunctionDef action later (not necessarily 2446/// immediately!) for this method, if it was also defined inside the 2447/// class body. 2448void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2449 if (!MethodD) 2450 return; 2451 2452 AdjustDeclIfTemplate(MethodD); 2453 2454 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2455 2456 // Now that we have our default arguments, check the constructor 2457 // again. It could produce additional diagnostics or affect whether 2458 // the class has implicitly-declared destructors, among other 2459 // things. 2460 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2461 CheckConstructor(Constructor); 2462 2463 // Check the default arguments, which we may have added. 2464 if (!Method->isInvalidDecl()) 2465 CheckCXXDefaultArguments(Method); 2466} 2467 2468/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2469/// the well-formedness of the constructor declarator @p D with type @p 2470/// R. If there are any errors in the declarator, this routine will 2471/// emit diagnostics and set the invalid bit to true. In any case, the type 2472/// will be updated to reflect a well-formed type for the constructor and 2473/// returned. 2474QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2475 FunctionDecl::StorageClass &SC) { 2476 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2477 2478 // C++ [class.ctor]p3: 2479 // A constructor shall not be virtual (10.3) or static (9.4). A 2480 // constructor can be invoked for a const, volatile or const 2481 // volatile object. A constructor shall not be declared const, 2482 // volatile, or const volatile (9.3.2). 2483 if (isVirtual) { 2484 if (!D.isInvalidType()) 2485 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2486 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2487 << SourceRange(D.getIdentifierLoc()); 2488 D.setInvalidType(); 2489 } 2490 if (SC == FunctionDecl::Static) { 2491 if (!D.isInvalidType()) 2492 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2494 << SourceRange(D.getIdentifierLoc()); 2495 D.setInvalidType(); 2496 SC = FunctionDecl::None; 2497 } 2498 2499 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2500 if (FTI.TypeQuals != 0) { 2501 if (FTI.TypeQuals & Qualifiers::Const) 2502 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2503 << "const" << SourceRange(D.getIdentifierLoc()); 2504 if (FTI.TypeQuals & Qualifiers::Volatile) 2505 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2506 << "volatile" << SourceRange(D.getIdentifierLoc()); 2507 if (FTI.TypeQuals & Qualifiers::Restrict) 2508 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2509 << "restrict" << SourceRange(D.getIdentifierLoc()); 2510 } 2511 2512 // Rebuild the function type "R" without any type qualifiers (in 2513 // case any of the errors above fired) and with "void" as the 2514 // return type, since constructors don't have return types. We 2515 // *always* have to do this, because GetTypeForDeclarator will 2516 // put in a result type of "int" when none was specified. 2517 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2518 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2519 Proto->getNumArgs(), 2520 Proto->isVariadic(), 0); 2521} 2522 2523/// CheckConstructor - Checks a fully-formed constructor for 2524/// well-formedness, issuing any diagnostics required. Returns true if 2525/// the constructor declarator is invalid. 2526void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2527 CXXRecordDecl *ClassDecl 2528 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2529 if (!ClassDecl) 2530 return Constructor->setInvalidDecl(); 2531 2532 // C++ [class.copy]p3: 2533 // A declaration of a constructor for a class X is ill-formed if 2534 // its first parameter is of type (optionally cv-qualified) X and 2535 // either there are no other parameters or else all other 2536 // parameters have default arguments. 2537 if (!Constructor->isInvalidDecl() && 2538 ((Constructor->getNumParams() == 1) || 2539 (Constructor->getNumParams() > 1 && 2540 Constructor->getParamDecl(1)->hasDefaultArg())) && 2541 Constructor->getTemplateSpecializationKind() 2542 != TSK_ImplicitInstantiation) { 2543 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2544 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2545 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2546 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2547 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2548 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2549 2550 // FIXME: Rather that making the constructor invalid, we should endeavor 2551 // to fix the type. 2552 Constructor->setInvalidDecl(); 2553 } 2554 } 2555 2556 // Notify the class that we've added a constructor. 2557 ClassDecl->addedConstructor(Context, Constructor); 2558} 2559 2560/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2561/// issuing any diagnostics required. Returns true on error. 2562bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2563 CXXRecordDecl *RD = Destructor->getParent(); 2564 2565 if (Destructor->isVirtual()) { 2566 SourceLocation Loc; 2567 2568 if (!Destructor->isImplicit()) 2569 Loc = Destructor->getLocation(); 2570 else 2571 Loc = RD->getLocation(); 2572 2573 // If we have a virtual destructor, look up the deallocation function 2574 FunctionDecl *OperatorDelete = 0; 2575 DeclarationName Name = 2576 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2577 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2578 return true; 2579 2580 Destructor->setOperatorDelete(OperatorDelete); 2581 } 2582 2583 return false; 2584} 2585 2586static inline bool 2587FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2588 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2589 FTI.ArgInfo[0].Param && 2590 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2591} 2592 2593/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2594/// the well-formednes of the destructor declarator @p D with type @p 2595/// R. If there are any errors in the declarator, this routine will 2596/// emit diagnostics and set the declarator to invalid. Even if this happens, 2597/// will be updated to reflect a well-formed type for the destructor and 2598/// returned. 2599QualType Sema::CheckDestructorDeclarator(Declarator &D, 2600 FunctionDecl::StorageClass& SC) { 2601 // C++ [class.dtor]p1: 2602 // [...] A typedef-name that names a class is a class-name 2603 // (7.1.3); however, a typedef-name that names a class shall not 2604 // be used as the identifier in the declarator for a destructor 2605 // declaration. 2606 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2607 if (isa<TypedefType>(DeclaratorType)) { 2608 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2609 << DeclaratorType; 2610 D.setInvalidType(); 2611 } 2612 2613 // C++ [class.dtor]p2: 2614 // A destructor is used to destroy objects of its class type. A 2615 // destructor takes no parameters, and no return type can be 2616 // specified for it (not even void). The address of a destructor 2617 // shall not be taken. A destructor shall not be static. A 2618 // destructor can be invoked for a const, volatile or const 2619 // volatile object. A destructor shall not be declared const, 2620 // volatile or const volatile (9.3.2). 2621 if (SC == FunctionDecl::Static) { 2622 if (!D.isInvalidType()) 2623 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2624 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2625 << SourceRange(D.getIdentifierLoc()); 2626 SC = FunctionDecl::None; 2627 D.setInvalidType(); 2628 } 2629 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2630 // Destructors don't have return types, but the parser will 2631 // happily parse something like: 2632 // 2633 // class X { 2634 // float ~X(); 2635 // }; 2636 // 2637 // The return type will be eliminated later. 2638 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2639 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2640 << SourceRange(D.getIdentifierLoc()); 2641 } 2642 2643 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2644 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2645 if (FTI.TypeQuals & Qualifiers::Const) 2646 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2647 << "const" << SourceRange(D.getIdentifierLoc()); 2648 if (FTI.TypeQuals & Qualifiers::Volatile) 2649 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2650 << "volatile" << SourceRange(D.getIdentifierLoc()); 2651 if (FTI.TypeQuals & Qualifiers::Restrict) 2652 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2653 << "restrict" << SourceRange(D.getIdentifierLoc()); 2654 D.setInvalidType(); 2655 } 2656 2657 // Make sure we don't have any parameters. 2658 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2659 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2660 2661 // Delete the parameters. 2662 FTI.freeArgs(); 2663 D.setInvalidType(); 2664 } 2665 2666 // Make sure the destructor isn't variadic. 2667 if (FTI.isVariadic) { 2668 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2669 D.setInvalidType(); 2670 } 2671 2672 // Rebuild the function type "R" without any type qualifiers or 2673 // parameters (in case any of the errors above fired) and with 2674 // "void" as the return type, since destructors don't have return 2675 // types. We *always* have to do this, because GetTypeForDeclarator 2676 // will put in a result type of "int" when none was specified. 2677 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2678} 2679 2680/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2681/// well-formednes of the conversion function declarator @p D with 2682/// type @p R. If there are any errors in the declarator, this routine 2683/// will emit diagnostics and return true. Otherwise, it will return 2684/// false. Either way, the type @p R will be updated to reflect a 2685/// well-formed type for the conversion operator. 2686void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2687 FunctionDecl::StorageClass& SC) { 2688 // C++ [class.conv.fct]p1: 2689 // Neither parameter types nor return type can be specified. The 2690 // type of a conversion function (8.3.5) is "function taking no 2691 // parameter returning conversion-type-id." 2692 if (SC == FunctionDecl::Static) { 2693 if (!D.isInvalidType()) 2694 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2695 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2696 << SourceRange(D.getIdentifierLoc()); 2697 D.setInvalidType(); 2698 SC = FunctionDecl::None; 2699 } 2700 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2701 // Conversion functions don't have return types, but the parser will 2702 // happily parse something like: 2703 // 2704 // class X { 2705 // float operator bool(); 2706 // }; 2707 // 2708 // The return type will be changed later anyway. 2709 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2710 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2711 << SourceRange(D.getIdentifierLoc()); 2712 } 2713 2714 // Make sure we don't have any parameters. 2715 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2716 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2717 2718 // Delete the parameters. 2719 D.getTypeObject(0).Fun.freeArgs(); 2720 D.setInvalidType(); 2721 } 2722 2723 // Make sure the conversion function isn't variadic. 2724 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2725 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2726 D.setInvalidType(); 2727 } 2728 2729 // C++ [class.conv.fct]p4: 2730 // The conversion-type-id shall not represent a function type nor 2731 // an array type. 2732 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2733 if (ConvType->isArrayType()) { 2734 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2735 ConvType = Context.getPointerType(ConvType); 2736 D.setInvalidType(); 2737 } else if (ConvType->isFunctionType()) { 2738 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2739 ConvType = Context.getPointerType(ConvType); 2740 D.setInvalidType(); 2741 } 2742 2743 // Rebuild the function type "R" without any parameters (in case any 2744 // of the errors above fired) and with the conversion type as the 2745 // return type. 2746 R = Context.getFunctionType(ConvType, 0, 0, false, 2747 R->getAs<FunctionProtoType>()->getTypeQuals()); 2748 2749 // C++0x explicit conversion operators. 2750 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2751 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2752 diag::warn_explicit_conversion_functions) 2753 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2754} 2755 2756/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2757/// the declaration of the given C++ conversion function. This routine 2758/// is responsible for recording the conversion function in the C++ 2759/// class, if possible. 2760Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2761 assert(Conversion && "Expected to receive a conversion function declaration"); 2762 2763 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2764 2765 // Make sure we aren't redeclaring the conversion function. 2766 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2767 2768 // C++ [class.conv.fct]p1: 2769 // [...] A conversion function is never used to convert a 2770 // (possibly cv-qualified) object to the (possibly cv-qualified) 2771 // same object type (or a reference to it), to a (possibly 2772 // cv-qualified) base class of that type (or a reference to it), 2773 // or to (possibly cv-qualified) void. 2774 // FIXME: Suppress this warning if the conversion function ends up being a 2775 // virtual function that overrides a virtual function in a base class. 2776 QualType ClassType 2777 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2778 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2779 ConvType = ConvTypeRef->getPointeeType(); 2780 if (ConvType->isRecordType()) { 2781 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2782 if (ConvType == ClassType) 2783 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2784 << ClassType; 2785 else if (IsDerivedFrom(ClassType, ConvType)) 2786 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2787 << ClassType << ConvType; 2788 } else if (ConvType->isVoidType()) { 2789 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2790 << ClassType << ConvType; 2791 } 2792 2793 if (Conversion->getPrimaryTemplate()) { 2794 // ignore specializations 2795 } else if (Conversion->getPreviousDeclaration()) { 2796 if (FunctionTemplateDecl *ConversionTemplate 2797 = Conversion->getDescribedFunctionTemplate()) { 2798 if (ClassDecl->replaceConversion( 2799 ConversionTemplate->getPreviousDeclaration(), 2800 ConversionTemplate)) 2801 return DeclPtrTy::make(ConversionTemplate); 2802 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2803 Conversion)) 2804 return DeclPtrTy::make(Conversion); 2805 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2806 } else if (FunctionTemplateDecl *ConversionTemplate 2807 = Conversion->getDescribedFunctionTemplate()) 2808 ClassDecl->addConversionFunction(ConversionTemplate); 2809 else 2810 ClassDecl->addConversionFunction(Conversion); 2811 2812 return DeclPtrTy::make(Conversion); 2813} 2814 2815//===----------------------------------------------------------------------===// 2816// Namespace Handling 2817//===----------------------------------------------------------------------===// 2818 2819/// ActOnStartNamespaceDef - This is called at the start of a namespace 2820/// definition. 2821Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2822 SourceLocation IdentLoc, 2823 IdentifierInfo *II, 2824 SourceLocation LBrace) { 2825 NamespaceDecl *Namespc = 2826 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2827 Namespc->setLBracLoc(LBrace); 2828 2829 Scope *DeclRegionScope = NamespcScope->getParent(); 2830 2831 if (II) { 2832 // C++ [namespace.def]p2: 2833 // The identifier in an original-namespace-definition shall not have been 2834 // previously defined in the declarative region in which the 2835 // original-namespace-definition appears. The identifier in an 2836 // original-namespace-definition is the name of the namespace. Subsequently 2837 // in that declarative region, it is treated as an original-namespace-name. 2838 2839 NamedDecl *PrevDecl 2840 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2841 ForRedeclaration); 2842 2843 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2844 // This is an extended namespace definition. 2845 // Attach this namespace decl to the chain of extended namespace 2846 // definitions. 2847 OrigNS->setNextNamespace(Namespc); 2848 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2849 2850 // Remove the previous declaration from the scope. 2851 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2852 IdResolver.RemoveDecl(OrigNS); 2853 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2854 } 2855 } else if (PrevDecl) { 2856 // This is an invalid name redefinition. 2857 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2858 << Namespc->getDeclName(); 2859 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2860 Namespc->setInvalidDecl(); 2861 // Continue on to push Namespc as current DeclContext and return it. 2862 } else if (II->isStr("std") && 2863 CurContext->getLookupContext()->isTranslationUnit()) { 2864 // This is the first "real" definition of the namespace "std", so update 2865 // our cache of the "std" namespace to point at this definition. 2866 if (StdNamespace) { 2867 // We had already defined a dummy namespace "std". Link this new 2868 // namespace definition to the dummy namespace "std". 2869 StdNamespace->setNextNamespace(Namespc); 2870 StdNamespace->setLocation(IdentLoc); 2871 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2872 } 2873 2874 // Make our StdNamespace cache point at the first real definition of the 2875 // "std" namespace. 2876 StdNamespace = Namespc; 2877 } 2878 2879 PushOnScopeChains(Namespc, DeclRegionScope); 2880 } else { 2881 // Anonymous namespaces. 2882 assert(Namespc->isAnonymousNamespace()); 2883 CurContext->addDecl(Namespc); 2884 2885 // Link the anonymous namespace into its parent. 2886 NamespaceDecl *PrevDecl; 2887 DeclContext *Parent = CurContext->getLookupContext(); 2888 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2889 PrevDecl = TU->getAnonymousNamespace(); 2890 TU->setAnonymousNamespace(Namespc); 2891 } else { 2892 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2893 PrevDecl = ND->getAnonymousNamespace(); 2894 ND->setAnonymousNamespace(Namespc); 2895 } 2896 2897 // Link the anonymous namespace with its previous declaration. 2898 if (PrevDecl) { 2899 assert(PrevDecl->isAnonymousNamespace()); 2900 assert(!PrevDecl->getNextNamespace()); 2901 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2902 PrevDecl->setNextNamespace(Namespc); 2903 } 2904 2905 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2906 // behaves as if it were replaced by 2907 // namespace unique { /* empty body */ } 2908 // using namespace unique; 2909 // namespace unique { namespace-body } 2910 // where all occurrences of 'unique' in a translation unit are 2911 // replaced by the same identifier and this identifier differs 2912 // from all other identifiers in the entire program. 2913 2914 // We just create the namespace with an empty name and then add an 2915 // implicit using declaration, just like the standard suggests. 2916 // 2917 // CodeGen enforces the "universally unique" aspect by giving all 2918 // declarations semantically contained within an anonymous 2919 // namespace internal linkage. 2920 2921 if (!PrevDecl) { 2922 UsingDirectiveDecl* UD 2923 = UsingDirectiveDecl::Create(Context, CurContext, 2924 /* 'using' */ LBrace, 2925 /* 'namespace' */ SourceLocation(), 2926 /* qualifier */ SourceRange(), 2927 /* NNS */ NULL, 2928 /* identifier */ SourceLocation(), 2929 Namespc, 2930 /* Ancestor */ CurContext); 2931 UD->setImplicit(); 2932 CurContext->addDecl(UD); 2933 } 2934 } 2935 2936 // Although we could have an invalid decl (i.e. the namespace name is a 2937 // redefinition), push it as current DeclContext and try to continue parsing. 2938 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2939 // for the namespace has the declarations that showed up in that particular 2940 // namespace definition. 2941 PushDeclContext(NamespcScope, Namespc); 2942 return DeclPtrTy::make(Namespc); 2943} 2944 2945/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2946/// is a namespace alias, returns the namespace it points to. 2947static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2948 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2949 return AD->getNamespace(); 2950 return dyn_cast_or_null<NamespaceDecl>(D); 2951} 2952 2953/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2954/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2955void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2956 Decl *Dcl = D.getAs<Decl>(); 2957 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2958 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2959 Namespc->setRBracLoc(RBrace); 2960 PopDeclContext(); 2961} 2962 2963Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2964 SourceLocation UsingLoc, 2965 SourceLocation NamespcLoc, 2966 const CXXScopeSpec &SS, 2967 SourceLocation IdentLoc, 2968 IdentifierInfo *NamespcName, 2969 AttributeList *AttrList) { 2970 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2971 assert(NamespcName && "Invalid NamespcName."); 2972 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2973 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2974 2975 UsingDirectiveDecl *UDir = 0; 2976 2977 // Lookup namespace name. 2978 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2979 LookupParsedName(R, S, &SS); 2980 if (R.isAmbiguous()) 2981 return DeclPtrTy(); 2982 2983 if (!R.empty()) { 2984 NamedDecl *Named = R.getFoundDecl(); 2985 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2986 && "expected namespace decl"); 2987 // C++ [namespace.udir]p1: 2988 // A using-directive specifies that the names in the nominated 2989 // namespace can be used in the scope in which the 2990 // using-directive appears after the using-directive. During 2991 // unqualified name lookup (3.4.1), the names appear as if they 2992 // were declared in the nearest enclosing namespace which 2993 // contains both the using-directive and the nominated 2994 // namespace. [Note: in this context, "contains" means "contains 2995 // directly or indirectly". ] 2996 2997 // Find enclosing context containing both using-directive and 2998 // nominated namespace. 2999 NamespaceDecl *NS = getNamespaceDecl(Named); 3000 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3001 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3002 CommonAncestor = CommonAncestor->getParent(); 3003 3004 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3005 SS.getRange(), 3006 (NestedNameSpecifier *)SS.getScopeRep(), 3007 IdentLoc, Named, CommonAncestor); 3008 PushUsingDirective(S, UDir); 3009 } else { 3010 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3011 } 3012 3013 // FIXME: We ignore attributes for now. 3014 delete AttrList; 3015 return DeclPtrTy::make(UDir); 3016} 3017 3018void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3019 // If scope has associated entity, then using directive is at namespace 3020 // or translation unit scope. We add UsingDirectiveDecls, into 3021 // it's lookup structure. 3022 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3023 Ctx->addDecl(UDir); 3024 else 3025 // Otherwise it is block-sope. using-directives will affect lookup 3026 // only to the end of scope. 3027 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3028} 3029 3030 3031Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3032 AccessSpecifier AS, 3033 bool HasUsingKeyword, 3034 SourceLocation UsingLoc, 3035 const CXXScopeSpec &SS, 3036 UnqualifiedId &Name, 3037 AttributeList *AttrList, 3038 bool IsTypeName, 3039 SourceLocation TypenameLoc) { 3040 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3041 3042 switch (Name.getKind()) { 3043 case UnqualifiedId::IK_Identifier: 3044 case UnqualifiedId::IK_OperatorFunctionId: 3045 case UnqualifiedId::IK_LiteralOperatorId: 3046 case UnqualifiedId::IK_ConversionFunctionId: 3047 break; 3048 3049 case UnqualifiedId::IK_ConstructorName: 3050 case UnqualifiedId::IK_ConstructorTemplateId: 3051 // C++0x inherited constructors. 3052 if (getLangOptions().CPlusPlus0x) break; 3053 3054 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3055 << SS.getRange(); 3056 return DeclPtrTy(); 3057 3058 case UnqualifiedId::IK_DestructorName: 3059 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3060 << SS.getRange(); 3061 return DeclPtrTy(); 3062 3063 case UnqualifiedId::IK_TemplateId: 3064 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3065 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3066 return DeclPtrTy(); 3067 } 3068 3069 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3070 if (!TargetName) 3071 return DeclPtrTy(); 3072 3073 // Warn about using declarations. 3074 // TODO: store that the declaration was written without 'using' and 3075 // talk about access decls instead of using decls in the 3076 // diagnostics. 3077 if (!HasUsingKeyword) { 3078 UsingLoc = Name.getSourceRange().getBegin(); 3079 3080 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3081 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3082 "using "); 3083 } 3084 3085 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3086 Name.getSourceRange().getBegin(), 3087 TargetName, AttrList, 3088 /* IsInstantiation */ false, 3089 IsTypeName, TypenameLoc); 3090 if (UD) 3091 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3092 3093 return DeclPtrTy::make(UD); 3094} 3095 3096/// Determines whether to create a using shadow decl for a particular 3097/// decl, given the set of decls existing prior to this using lookup. 3098bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3099 const LookupResult &Previous) { 3100 // Diagnose finding a decl which is not from a base class of the 3101 // current class. We do this now because there are cases where this 3102 // function will silently decide not to build a shadow decl, which 3103 // will pre-empt further diagnostics. 3104 // 3105 // We don't need to do this in C++0x because we do the check once on 3106 // the qualifier. 3107 // 3108 // FIXME: diagnose the following if we care enough: 3109 // struct A { int foo; }; 3110 // struct B : A { using A::foo; }; 3111 // template <class T> struct C : A {}; 3112 // template <class T> struct D : C<T> { using B::foo; } // <--- 3113 // This is invalid (during instantiation) in C++03 because B::foo 3114 // resolves to the using decl in B, which is not a base class of D<T>. 3115 // We can't diagnose it immediately because C<T> is an unknown 3116 // specialization. The UsingShadowDecl in D<T> then points directly 3117 // to A::foo, which will look well-formed when we instantiate. 3118 // The right solution is to not collapse the shadow-decl chain. 3119 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3120 DeclContext *OrigDC = Orig->getDeclContext(); 3121 3122 // Handle enums and anonymous structs. 3123 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3124 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3125 while (OrigRec->isAnonymousStructOrUnion()) 3126 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3127 3128 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3129 if (OrigDC == CurContext) { 3130 Diag(Using->getLocation(), 3131 diag::err_using_decl_nested_name_specifier_is_current_class) 3132 << Using->getNestedNameRange(); 3133 Diag(Orig->getLocation(), diag::note_using_decl_target); 3134 return true; 3135 } 3136 3137 Diag(Using->getNestedNameRange().getBegin(), 3138 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3139 << Using->getTargetNestedNameDecl() 3140 << cast<CXXRecordDecl>(CurContext) 3141 << Using->getNestedNameRange(); 3142 Diag(Orig->getLocation(), diag::note_using_decl_target); 3143 return true; 3144 } 3145 } 3146 3147 if (Previous.empty()) return false; 3148 3149 NamedDecl *Target = Orig; 3150 if (isa<UsingShadowDecl>(Target)) 3151 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3152 3153 // If the target happens to be one of the previous declarations, we 3154 // don't have a conflict. 3155 // 3156 // FIXME: but we might be increasing its access, in which case we 3157 // should redeclare it. 3158 NamedDecl *NonTag = 0, *Tag = 0; 3159 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3160 I != E; ++I) { 3161 NamedDecl *D = (*I)->getUnderlyingDecl(); 3162 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3163 return false; 3164 3165 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3166 } 3167 3168 if (Target->isFunctionOrFunctionTemplate()) { 3169 FunctionDecl *FD; 3170 if (isa<FunctionTemplateDecl>(Target)) 3171 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3172 else 3173 FD = cast<FunctionDecl>(Target); 3174 3175 NamedDecl *OldDecl = 0; 3176 switch (CheckOverload(FD, Previous, OldDecl)) { 3177 case Ovl_Overload: 3178 return false; 3179 3180 case Ovl_NonFunction: 3181 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3182 break; 3183 3184 // We found a decl with the exact signature. 3185 case Ovl_Match: 3186 if (isa<UsingShadowDecl>(OldDecl)) { 3187 // Silently ignore the possible conflict. 3188 return false; 3189 } 3190 3191 // If we're in a record, we want to hide the target, so we 3192 // return true (without a diagnostic) to tell the caller not to 3193 // build a shadow decl. 3194 if (CurContext->isRecord()) 3195 return true; 3196 3197 // If we're not in a record, this is an error. 3198 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3199 break; 3200 } 3201 3202 Diag(Target->getLocation(), diag::note_using_decl_target); 3203 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3204 return true; 3205 } 3206 3207 // Target is not a function. 3208 3209 if (isa<TagDecl>(Target)) { 3210 // No conflict between a tag and a non-tag. 3211 if (!Tag) return false; 3212 3213 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3214 Diag(Target->getLocation(), diag::note_using_decl_target); 3215 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3216 return true; 3217 } 3218 3219 // No conflict between a tag and a non-tag. 3220 if (!NonTag) return false; 3221 3222 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3223 Diag(Target->getLocation(), diag::note_using_decl_target); 3224 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3225 return true; 3226} 3227 3228/// Builds a shadow declaration corresponding to a 'using' declaration. 3229UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3230 UsingDecl *UD, 3231 NamedDecl *Orig) { 3232 3233 // If we resolved to another shadow declaration, just coalesce them. 3234 NamedDecl *Target = Orig; 3235 if (isa<UsingShadowDecl>(Target)) { 3236 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3237 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3238 } 3239 3240 UsingShadowDecl *Shadow 3241 = UsingShadowDecl::Create(Context, CurContext, 3242 UD->getLocation(), UD, Target); 3243 UD->addShadowDecl(Shadow); 3244 3245 if (S) 3246 PushOnScopeChains(Shadow, S); 3247 else 3248 CurContext->addDecl(Shadow); 3249 Shadow->setAccess(UD->getAccess()); 3250 3251 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3252 Shadow->setInvalidDecl(); 3253 3254 return Shadow; 3255} 3256 3257/// Hides a using shadow declaration. This is required by the current 3258/// using-decl implementation when a resolvable using declaration in a 3259/// class is followed by a declaration which would hide or override 3260/// one or more of the using decl's targets; for example: 3261/// 3262/// struct Base { void foo(int); }; 3263/// struct Derived : Base { 3264/// using Base::foo; 3265/// void foo(int); 3266/// }; 3267/// 3268/// The governing language is C++03 [namespace.udecl]p12: 3269/// 3270/// When a using-declaration brings names from a base class into a 3271/// derived class scope, member functions in the derived class 3272/// override and/or hide member functions with the same name and 3273/// parameter types in a base class (rather than conflicting). 3274/// 3275/// There are two ways to implement this: 3276/// (1) optimistically create shadow decls when they're not hidden 3277/// by existing declarations, or 3278/// (2) don't create any shadow decls (or at least don't make them 3279/// visible) until we've fully parsed/instantiated the class. 3280/// The problem with (1) is that we might have to retroactively remove 3281/// a shadow decl, which requires several O(n) operations because the 3282/// decl structures are (very reasonably) not designed for removal. 3283/// (2) avoids this but is very fiddly and phase-dependent. 3284void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3285 // Remove it from the DeclContext... 3286 Shadow->getDeclContext()->removeDecl(Shadow); 3287 3288 // ...and the scope, if applicable... 3289 if (S) { 3290 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3291 IdResolver.RemoveDecl(Shadow); 3292 } 3293 3294 // ...and the using decl. 3295 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3296 3297 // TODO: complain somehow if Shadow was used. It shouldn't 3298 // be possible for this to happen, because 3299} 3300 3301/// Builds a using declaration. 3302/// 3303/// \param IsInstantiation - Whether this call arises from an 3304/// instantiation of an unresolved using declaration. We treat 3305/// the lookup differently for these declarations. 3306NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3307 SourceLocation UsingLoc, 3308 const CXXScopeSpec &SS, 3309 SourceLocation IdentLoc, 3310 DeclarationName Name, 3311 AttributeList *AttrList, 3312 bool IsInstantiation, 3313 bool IsTypeName, 3314 SourceLocation TypenameLoc) { 3315 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3316 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3317 3318 // FIXME: We ignore attributes for now. 3319 delete AttrList; 3320 3321 if (SS.isEmpty()) { 3322 Diag(IdentLoc, diag::err_using_requires_qualname); 3323 return 0; 3324 } 3325 3326 // Do the redeclaration lookup in the current scope. 3327 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3328 ForRedeclaration); 3329 Previous.setHideTags(false); 3330 if (S) { 3331 LookupName(Previous, S); 3332 3333 // It is really dumb that we have to do this. 3334 LookupResult::Filter F = Previous.makeFilter(); 3335 while (F.hasNext()) { 3336 NamedDecl *D = F.next(); 3337 if (!isDeclInScope(D, CurContext, S)) 3338 F.erase(); 3339 } 3340 F.done(); 3341 } else { 3342 assert(IsInstantiation && "no scope in non-instantiation"); 3343 assert(CurContext->isRecord() && "scope not record in instantiation"); 3344 LookupQualifiedName(Previous, CurContext); 3345 } 3346 3347 NestedNameSpecifier *NNS = 3348 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3349 3350 // Check for invalid redeclarations. 3351 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3352 return 0; 3353 3354 // Check for bad qualifiers. 3355 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3356 return 0; 3357 3358 DeclContext *LookupContext = computeDeclContext(SS); 3359 NamedDecl *D; 3360 if (!LookupContext) { 3361 if (IsTypeName) { 3362 // FIXME: not all declaration name kinds are legal here 3363 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3364 UsingLoc, TypenameLoc, 3365 SS.getRange(), NNS, 3366 IdentLoc, Name); 3367 } else { 3368 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3369 UsingLoc, SS.getRange(), NNS, 3370 IdentLoc, Name); 3371 } 3372 } else { 3373 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3374 SS.getRange(), UsingLoc, NNS, Name, 3375 IsTypeName); 3376 } 3377 D->setAccess(AS); 3378 CurContext->addDecl(D); 3379 3380 if (!LookupContext) return D; 3381 UsingDecl *UD = cast<UsingDecl>(D); 3382 3383 if (RequireCompleteDeclContext(SS)) { 3384 UD->setInvalidDecl(); 3385 return UD; 3386 } 3387 3388 // Look up the target name. 3389 3390 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3391 3392 // Unlike most lookups, we don't always want to hide tag 3393 // declarations: tag names are visible through the using declaration 3394 // even if hidden by ordinary names, *except* in a dependent context 3395 // where it's important for the sanity of two-phase lookup. 3396 if (!IsInstantiation) 3397 R.setHideTags(false); 3398 3399 LookupQualifiedName(R, LookupContext); 3400 3401 if (R.empty()) { 3402 Diag(IdentLoc, diag::err_no_member) 3403 << Name << LookupContext << SS.getRange(); 3404 UD->setInvalidDecl(); 3405 return UD; 3406 } 3407 3408 if (R.isAmbiguous()) { 3409 UD->setInvalidDecl(); 3410 return UD; 3411 } 3412 3413 if (IsTypeName) { 3414 // If we asked for a typename and got a non-type decl, error out. 3415 if (!R.getAsSingle<TypeDecl>()) { 3416 Diag(IdentLoc, diag::err_using_typename_non_type); 3417 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3418 Diag((*I)->getUnderlyingDecl()->getLocation(), 3419 diag::note_using_decl_target); 3420 UD->setInvalidDecl(); 3421 return UD; 3422 } 3423 } else { 3424 // If we asked for a non-typename and we got a type, error out, 3425 // but only if this is an instantiation of an unresolved using 3426 // decl. Otherwise just silently find the type name. 3427 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3428 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3429 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3430 UD->setInvalidDecl(); 3431 return UD; 3432 } 3433 } 3434 3435 // C++0x N2914 [namespace.udecl]p6: 3436 // A using-declaration shall not name a namespace. 3437 if (R.getAsSingle<NamespaceDecl>()) { 3438 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3439 << SS.getRange(); 3440 UD->setInvalidDecl(); 3441 return UD; 3442 } 3443 3444 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3445 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3446 BuildUsingShadowDecl(S, UD, *I); 3447 } 3448 3449 return UD; 3450} 3451 3452/// Checks that the given using declaration is not an invalid 3453/// redeclaration. Note that this is checking only for the using decl 3454/// itself, not for any ill-formedness among the UsingShadowDecls. 3455bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3456 bool isTypeName, 3457 const CXXScopeSpec &SS, 3458 SourceLocation NameLoc, 3459 const LookupResult &Prev) { 3460 // C++03 [namespace.udecl]p8: 3461 // C++0x [namespace.udecl]p10: 3462 // A using-declaration is a declaration and can therefore be used 3463 // repeatedly where (and only where) multiple declarations are 3464 // allowed. 3465 // That's only in file contexts. 3466 if (CurContext->getLookupContext()->isFileContext()) 3467 return false; 3468 3469 NestedNameSpecifier *Qual 3470 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3471 3472 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3473 NamedDecl *D = *I; 3474 3475 bool DTypename; 3476 NestedNameSpecifier *DQual; 3477 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3478 DTypename = UD->isTypeName(); 3479 DQual = UD->getTargetNestedNameDecl(); 3480 } else if (UnresolvedUsingValueDecl *UD 3481 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3482 DTypename = false; 3483 DQual = UD->getTargetNestedNameSpecifier(); 3484 } else if (UnresolvedUsingTypenameDecl *UD 3485 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3486 DTypename = true; 3487 DQual = UD->getTargetNestedNameSpecifier(); 3488 } else continue; 3489 3490 // using decls differ if one says 'typename' and the other doesn't. 3491 // FIXME: non-dependent using decls? 3492 if (isTypeName != DTypename) continue; 3493 3494 // using decls differ if they name different scopes (but note that 3495 // template instantiation can cause this check to trigger when it 3496 // didn't before instantiation). 3497 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3498 Context.getCanonicalNestedNameSpecifier(DQual)) 3499 continue; 3500 3501 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3502 Diag(D->getLocation(), diag::note_using_decl) << 1; 3503 return true; 3504 } 3505 3506 return false; 3507} 3508 3509 3510/// Checks that the given nested-name qualifier used in a using decl 3511/// in the current context is appropriately related to the current 3512/// scope. If an error is found, diagnoses it and returns true. 3513bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3514 const CXXScopeSpec &SS, 3515 SourceLocation NameLoc) { 3516 DeclContext *NamedContext = computeDeclContext(SS); 3517 3518 if (!CurContext->isRecord()) { 3519 // C++03 [namespace.udecl]p3: 3520 // C++0x [namespace.udecl]p8: 3521 // A using-declaration for a class member shall be a member-declaration. 3522 3523 // If we weren't able to compute a valid scope, it must be a 3524 // dependent class scope. 3525 if (!NamedContext || NamedContext->isRecord()) { 3526 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3527 << SS.getRange(); 3528 return true; 3529 } 3530 3531 // Otherwise, everything is known to be fine. 3532 return false; 3533 } 3534 3535 // The current scope is a record. 3536 3537 // If the named context is dependent, we can't decide much. 3538 if (!NamedContext) { 3539 // FIXME: in C++0x, we can diagnose if we can prove that the 3540 // nested-name-specifier does not refer to a base class, which is 3541 // still possible in some cases. 3542 3543 // Otherwise we have to conservatively report that things might be 3544 // okay. 3545 return false; 3546 } 3547 3548 if (!NamedContext->isRecord()) { 3549 // Ideally this would point at the last name in the specifier, 3550 // but we don't have that level of source info. 3551 Diag(SS.getRange().getBegin(), 3552 diag::err_using_decl_nested_name_specifier_is_not_class) 3553 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3554 return true; 3555 } 3556 3557 if (getLangOptions().CPlusPlus0x) { 3558 // C++0x [namespace.udecl]p3: 3559 // In a using-declaration used as a member-declaration, the 3560 // nested-name-specifier shall name a base class of the class 3561 // being defined. 3562 3563 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3564 cast<CXXRecordDecl>(NamedContext))) { 3565 if (CurContext == NamedContext) { 3566 Diag(NameLoc, 3567 diag::err_using_decl_nested_name_specifier_is_current_class) 3568 << SS.getRange(); 3569 return true; 3570 } 3571 3572 Diag(SS.getRange().getBegin(), 3573 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3574 << (NestedNameSpecifier*) SS.getScopeRep() 3575 << cast<CXXRecordDecl>(CurContext) 3576 << SS.getRange(); 3577 return true; 3578 } 3579 3580 return false; 3581 } 3582 3583 // C++03 [namespace.udecl]p4: 3584 // A using-declaration used as a member-declaration shall refer 3585 // to a member of a base class of the class being defined [etc.]. 3586 3587 // Salient point: SS doesn't have to name a base class as long as 3588 // lookup only finds members from base classes. Therefore we can 3589 // diagnose here only if we can prove that that can't happen, 3590 // i.e. if the class hierarchies provably don't intersect. 3591 3592 // TODO: it would be nice if "definitely valid" results were cached 3593 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3594 // need to be repeated. 3595 3596 struct UserData { 3597 llvm::DenseSet<const CXXRecordDecl*> Bases; 3598 3599 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3600 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3601 Data->Bases.insert(Base); 3602 return true; 3603 } 3604 3605 bool hasDependentBases(const CXXRecordDecl *Class) { 3606 return !Class->forallBases(collect, this); 3607 } 3608 3609 /// Returns true if the base is dependent or is one of the 3610 /// accumulated base classes. 3611 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3612 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3613 return !Data->Bases.count(Base); 3614 } 3615 3616 bool mightShareBases(const CXXRecordDecl *Class) { 3617 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3618 } 3619 }; 3620 3621 UserData Data; 3622 3623 // Returns false if we find a dependent base. 3624 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3625 return false; 3626 3627 // Returns false if the class has a dependent base or if it or one 3628 // of its bases is present in the base set of the current context. 3629 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3630 return false; 3631 3632 Diag(SS.getRange().getBegin(), 3633 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3634 << (NestedNameSpecifier*) SS.getScopeRep() 3635 << cast<CXXRecordDecl>(CurContext) 3636 << SS.getRange(); 3637 3638 return true; 3639} 3640 3641Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3642 SourceLocation NamespaceLoc, 3643 SourceLocation AliasLoc, 3644 IdentifierInfo *Alias, 3645 const CXXScopeSpec &SS, 3646 SourceLocation IdentLoc, 3647 IdentifierInfo *Ident) { 3648 3649 // Lookup the namespace name. 3650 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3651 LookupParsedName(R, S, &SS); 3652 3653 // Check if we have a previous declaration with the same name. 3654 if (NamedDecl *PrevDecl 3655 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3656 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3657 // We already have an alias with the same name that points to the same 3658 // namespace, so don't create a new one. 3659 if (!R.isAmbiguous() && !R.empty() && 3660 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3661 return DeclPtrTy(); 3662 } 3663 3664 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3665 diag::err_redefinition_different_kind; 3666 Diag(AliasLoc, DiagID) << Alias; 3667 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3668 return DeclPtrTy(); 3669 } 3670 3671 if (R.isAmbiguous()) 3672 return DeclPtrTy(); 3673 3674 if (R.empty()) { 3675 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3676 return DeclPtrTy(); 3677 } 3678 3679 NamespaceAliasDecl *AliasDecl = 3680 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3681 Alias, SS.getRange(), 3682 (NestedNameSpecifier *)SS.getScopeRep(), 3683 IdentLoc, R.getFoundDecl()); 3684 3685 CurContext->addDecl(AliasDecl); 3686 return DeclPtrTy::make(AliasDecl); 3687} 3688 3689void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3690 CXXConstructorDecl *Constructor) { 3691 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3692 !Constructor->isUsed()) && 3693 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3694 3695 CXXRecordDecl *ClassDecl 3696 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3697 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3698 3699 DeclContext *PreviousContext = CurContext; 3700 CurContext = Constructor; 3701 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3702 Diag(CurrentLocation, diag::note_member_synthesized_at) 3703 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3704 Constructor->setInvalidDecl(); 3705 } else { 3706 Constructor->setUsed(); 3707 } 3708 CurContext = PreviousContext; 3709} 3710 3711void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3712 CXXDestructorDecl *Destructor) { 3713 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3714 "DefineImplicitDestructor - call it for implicit default dtor"); 3715 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3716 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3717 3718 DeclContext *PreviousContext = CurContext; 3719 CurContext = Destructor; 3720 3721 // C++ [class.dtor] p5 3722 // Before the implicitly-declared default destructor for a class is 3723 // implicitly defined, all the implicitly-declared default destructors 3724 // for its base class and its non-static data members shall have been 3725 // implicitly defined. 3726 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3727 E = ClassDecl->bases_end(); Base != E; ++Base) { 3728 CXXRecordDecl *BaseClassDecl 3729 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3730 if (!BaseClassDecl->hasTrivialDestructor()) { 3731 if (CXXDestructorDecl *BaseDtor = 3732 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3733 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3734 else 3735 assert(false && 3736 "DefineImplicitDestructor - missing dtor in a base class"); 3737 } 3738 } 3739 3740 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3741 E = ClassDecl->field_end(); Field != E; ++Field) { 3742 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3743 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3744 FieldType = Array->getElementType(); 3745 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3746 CXXRecordDecl *FieldClassDecl 3747 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3748 if (!FieldClassDecl->hasTrivialDestructor()) { 3749 if (CXXDestructorDecl *FieldDtor = 3750 const_cast<CXXDestructorDecl*>( 3751 FieldClassDecl->getDestructor(Context))) 3752 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3753 else 3754 assert(false && 3755 "DefineImplicitDestructor - missing dtor in class of a data member"); 3756 } 3757 } 3758 } 3759 3760 // FIXME: If CheckDestructor fails, we should emit a note about where the 3761 // implicit destructor was needed. 3762 if (CheckDestructor(Destructor)) { 3763 Diag(CurrentLocation, diag::note_member_synthesized_at) 3764 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3765 3766 Destructor->setInvalidDecl(); 3767 CurContext = PreviousContext; 3768 3769 return; 3770 } 3771 CurContext = PreviousContext; 3772 3773 Destructor->setUsed(); 3774} 3775 3776void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3777 CXXMethodDecl *MethodDecl) { 3778 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3779 MethodDecl->getOverloadedOperator() == OO_Equal && 3780 !MethodDecl->isUsed()) && 3781 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3782 3783 CXXRecordDecl *ClassDecl 3784 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3785 3786 DeclContext *PreviousContext = CurContext; 3787 CurContext = MethodDecl; 3788 3789 // C++[class.copy] p12 3790 // Before the implicitly-declared copy assignment operator for a class is 3791 // implicitly defined, all implicitly-declared copy assignment operators 3792 // for its direct base classes and its nonstatic data members shall have 3793 // been implicitly defined. 3794 bool err = false; 3795 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3796 E = ClassDecl->bases_end(); Base != E; ++Base) { 3797 CXXRecordDecl *BaseClassDecl 3798 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3799 if (CXXMethodDecl *BaseAssignOpMethod = 3800 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3801 BaseClassDecl)) 3802 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3803 } 3804 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3805 E = ClassDecl->field_end(); Field != E; ++Field) { 3806 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3807 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3808 FieldType = Array->getElementType(); 3809 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3810 CXXRecordDecl *FieldClassDecl 3811 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3812 if (CXXMethodDecl *FieldAssignOpMethod = 3813 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3814 FieldClassDecl)) 3815 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3816 } else if (FieldType->isReferenceType()) { 3817 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3818 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3819 Diag(Field->getLocation(), diag::note_declared_at); 3820 Diag(CurrentLocation, diag::note_first_required_here); 3821 err = true; 3822 } else if (FieldType.isConstQualified()) { 3823 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3824 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3825 Diag(Field->getLocation(), diag::note_declared_at); 3826 Diag(CurrentLocation, diag::note_first_required_here); 3827 err = true; 3828 } 3829 } 3830 if (!err) 3831 MethodDecl->setUsed(); 3832 3833 CurContext = PreviousContext; 3834} 3835 3836CXXMethodDecl * 3837Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3838 ParmVarDecl *ParmDecl, 3839 CXXRecordDecl *ClassDecl) { 3840 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3841 QualType RHSType(LHSType); 3842 // If class's assignment operator argument is const/volatile qualified, 3843 // look for operator = (const/volatile B&). Otherwise, look for 3844 // operator = (B&). 3845 RHSType = Context.getCVRQualifiedType(RHSType, 3846 ParmDecl->getType().getCVRQualifiers()); 3847 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3848 LHSType, 3849 SourceLocation())); 3850 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3851 RHSType, 3852 CurrentLocation)); 3853 Expr *Args[2] = { &*LHS, &*RHS }; 3854 OverloadCandidateSet CandidateSet; 3855 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3856 CandidateSet); 3857 OverloadCandidateSet::iterator Best; 3858 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3859 return cast<CXXMethodDecl>(Best->Function); 3860 assert(false && 3861 "getAssignOperatorMethod - copy assignment operator method not found"); 3862 return 0; 3863} 3864 3865void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3866 CXXConstructorDecl *CopyConstructor, 3867 unsigned TypeQuals) { 3868 assert((CopyConstructor->isImplicit() && 3869 CopyConstructor->isCopyConstructor(TypeQuals) && 3870 !CopyConstructor->isUsed()) && 3871 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3872 3873 CXXRecordDecl *ClassDecl 3874 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3875 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3876 3877 DeclContext *PreviousContext = CurContext; 3878 CurContext = CopyConstructor; 3879 3880 // C++ [class.copy] p209 3881 // Before the implicitly-declared copy constructor for a class is 3882 // implicitly defined, all the implicitly-declared copy constructors 3883 // for its base class and its non-static data members shall have been 3884 // implicitly defined. 3885 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3886 Base != ClassDecl->bases_end(); ++Base) { 3887 CXXRecordDecl *BaseClassDecl 3888 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3889 if (CXXConstructorDecl *BaseCopyCtor = 3890 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3891 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3892 } 3893 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3894 FieldEnd = ClassDecl->field_end(); 3895 Field != FieldEnd; ++Field) { 3896 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3897 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3898 FieldType = Array->getElementType(); 3899 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3900 CXXRecordDecl *FieldClassDecl 3901 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3902 if (CXXConstructorDecl *FieldCopyCtor = 3903 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3904 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3905 } 3906 } 3907 CopyConstructor->setUsed(); 3908 3909 CurContext = PreviousContext; 3910} 3911 3912Sema::OwningExprResult 3913Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3914 CXXConstructorDecl *Constructor, 3915 MultiExprArg ExprArgs, 3916 bool RequiresZeroInit, 3917 bool BaseInitialization) { 3918 bool Elidable = false; 3919 3920 // C++ [class.copy]p15: 3921 // Whenever a temporary class object is copied using a copy constructor, and 3922 // this object and the copy have the same cv-unqualified type, an 3923 // implementation is permitted to treat the original and the copy as two 3924 // different ways of referring to the same object and not perform a copy at 3925 // all, even if the class copy constructor or destructor have side effects. 3926 3927 // FIXME: Is this enough? 3928 if (Constructor->isCopyConstructor()) { 3929 Expr *E = ((Expr **)ExprArgs.get())[0]; 3930 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3931 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3932 E = ICE->getSubExpr(); 3933 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3934 E = FCE->getSubExpr(); 3935 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3936 E = BE->getSubExpr(); 3937 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3938 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3939 E = ICE->getSubExpr(); 3940 3941 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3942 Elidable = !CE->getCallReturnType()->isReferenceType(); 3943 else if (isa<CXXTemporaryObjectExpr>(E)) 3944 Elidable = true; 3945 else if (isa<CXXConstructExpr>(E)) 3946 Elidable = true; 3947 } 3948 3949 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3950 Elidable, move(ExprArgs), RequiresZeroInit, 3951 BaseInitialization); 3952} 3953 3954/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3955/// including handling of its default argument expressions. 3956Sema::OwningExprResult 3957Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3958 CXXConstructorDecl *Constructor, bool Elidable, 3959 MultiExprArg ExprArgs, 3960 bool RequiresZeroInit, 3961 bool BaseInitialization) { 3962 unsigned NumExprs = ExprArgs.size(); 3963 Expr **Exprs = (Expr **)ExprArgs.release(); 3964 3965 MarkDeclarationReferenced(ConstructLoc, Constructor); 3966 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3967 Constructor, Elidable, Exprs, NumExprs, 3968 RequiresZeroInit, BaseInitialization)); 3969} 3970 3971bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3972 CXXConstructorDecl *Constructor, 3973 MultiExprArg Exprs) { 3974 OwningExprResult TempResult = 3975 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3976 move(Exprs)); 3977 if (TempResult.isInvalid()) 3978 return true; 3979 3980 Expr *Temp = TempResult.takeAs<Expr>(); 3981 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3982 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3983 VD->setInit(Context, Temp); 3984 3985 return false; 3986} 3987 3988void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 3989 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 3990 if (!ClassDecl->hasTrivialDestructor()) { 3991 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 3992 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3993 CheckDestructorAccess(VD->getLocation(), Record); 3994 } 3995} 3996 3997/// AddCXXDirectInitializerToDecl - This action is called immediately after 3998/// ActOnDeclarator, when a C++ direct initializer is present. 3999/// e.g: "int x(1);" 4000void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4001 SourceLocation LParenLoc, 4002 MultiExprArg Exprs, 4003 SourceLocation *CommaLocs, 4004 SourceLocation RParenLoc) { 4005 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4006 Decl *RealDecl = Dcl.getAs<Decl>(); 4007 4008 // If there is no declaration, there was an error parsing it. Just ignore 4009 // the initializer. 4010 if (RealDecl == 0) 4011 return; 4012 4013 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4014 if (!VDecl) { 4015 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4016 RealDecl->setInvalidDecl(); 4017 return; 4018 } 4019 4020 // We will represent direct-initialization similarly to copy-initialization: 4021 // int x(1); -as-> int x = 1; 4022 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4023 // 4024 // Clients that want to distinguish between the two forms, can check for 4025 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4026 // A major benefit is that clients that don't particularly care about which 4027 // exactly form was it (like the CodeGen) can handle both cases without 4028 // special case code. 4029 4030 // If either the declaration has a dependent type or if any of the expressions 4031 // is type-dependent, we represent the initialization via a ParenListExpr for 4032 // later use during template instantiation. 4033 if (VDecl->getType()->isDependentType() || 4034 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4035 // Let clients know that initialization was done with a direct initializer. 4036 VDecl->setCXXDirectInitializer(true); 4037 4038 // Store the initialization expressions as a ParenListExpr. 4039 unsigned NumExprs = Exprs.size(); 4040 VDecl->setInit(Context, 4041 new (Context) ParenListExpr(Context, LParenLoc, 4042 (Expr **)Exprs.release(), 4043 NumExprs, RParenLoc)); 4044 return; 4045 } 4046 4047 4048 // C++ 8.5p11: 4049 // The form of initialization (using parentheses or '=') is generally 4050 // insignificant, but does matter when the entity being initialized has a 4051 // class type. 4052 QualType DeclInitType = VDecl->getType(); 4053 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4054 DeclInitType = Context.getBaseElementType(Array); 4055 4056 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4057 diag::err_typecheck_decl_incomplete_type)) { 4058 VDecl->setInvalidDecl(); 4059 return; 4060 } 4061 4062 // The variable can not have an abstract class type. 4063 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4064 diag::err_abstract_type_in_decl, 4065 AbstractVariableType)) 4066 VDecl->setInvalidDecl(); 4067 4068 const VarDecl *Def; 4069 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4070 Diag(VDecl->getLocation(), diag::err_redefinition) 4071 << VDecl->getDeclName(); 4072 Diag(Def->getLocation(), diag::note_previous_definition); 4073 VDecl->setInvalidDecl(); 4074 return; 4075 } 4076 4077 // Capture the variable that is being initialized and the style of 4078 // initialization. 4079 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4080 4081 // FIXME: Poor source location information. 4082 InitializationKind Kind 4083 = InitializationKind::CreateDirect(VDecl->getLocation(), 4084 LParenLoc, RParenLoc); 4085 4086 InitializationSequence InitSeq(*this, Entity, Kind, 4087 (Expr**)Exprs.get(), Exprs.size()); 4088 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4089 if (Result.isInvalid()) { 4090 VDecl->setInvalidDecl(); 4091 return; 4092 } 4093 4094 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4095 VDecl->setInit(Context, Result.takeAs<Expr>()); 4096 VDecl->setCXXDirectInitializer(true); 4097 4098 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4099 FinalizeVarWithDestructor(VDecl, Record); 4100} 4101 4102/// \brief Add the applicable constructor candidates for an initialization 4103/// by constructor. 4104static void AddConstructorInitializationCandidates(Sema &SemaRef, 4105 QualType ClassType, 4106 Expr **Args, 4107 unsigned NumArgs, 4108 InitializationKind Kind, 4109 OverloadCandidateSet &CandidateSet) { 4110 // C++ [dcl.init]p14: 4111 // If the initialization is direct-initialization, or if it is 4112 // copy-initialization where the cv-unqualified version of the 4113 // source type is the same class as, or a derived class of, the 4114 // class of the destination, constructors are considered. The 4115 // applicable constructors are enumerated (13.3.1.3), and the 4116 // best one is chosen through overload resolution (13.3). The 4117 // constructor so selected is called to initialize the object, 4118 // with the initializer expression(s) as its argument(s). If no 4119 // constructor applies, or the overload resolution is ambiguous, 4120 // the initialization is ill-formed. 4121 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4122 assert(ClassRec && "Can only initialize a class type here"); 4123 4124 // FIXME: When we decide not to synthesize the implicitly-declared 4125 // constructors, we'll need to make them appear here. 4126 4127 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4128 DeclarationName ConstructorName 4129 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4130 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4131 DeclContext::lookup_const_iterator Con, ConEnd; 4132 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4133 Con != ConEnd; ++Con) { 4134 // Find the constructor (which may be a template). 4135 CXXConstructorDecl *Constructor = 0; 4136 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4137 if (ConstructorTmpl) 4138 Constructor 4139 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4140 else 4141 Constructor = cast<CXXConstructorDecl>(*Con); 4142 4143 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4144 (Kind.getKind() == InitializationKind::IK_Value) || 4145 (Kind.getKind() == InitializationKind::IK_Copy && 4146 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4147 ((Kind.getKind() == InitializationKind::IK_Default) && 4148 Constructor->isDefaultConstructor())) { 4149 if (ConstructorTmpl) 4150 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4151 ConstructorTmpl->getAccess(), 4152 /*ExplicitArgs*/ 0, 4153 Args, NumArgs, CandidateSet); 4154 else 4155 SemaRef.AddOverloadCandidate(Constructor, Constructor->getAccess(), 4156 Args, NumArgs, CandidateSet); 4157 } 4158 } 4159} 4160 4161/// \brief Attempt to perform initialization by constructor 4162/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4163/// copy-initialization. 4164/// 4165/// This routine determines whether initialization by constructor is possible, 4166/// but it does not emit any diagnostics in the case where the initialization 4167/// is ill-formed. 4168/// 4169/// \param ClassType the type of the object being initialized, which must have 4170/// class type. 4171/// 4172/// \param Args the arguments provided to initialize the object 4173/// 4174/// \param NumArgs the number of arguments provided to initialize the object 4175/// 4176/// \param Kind the type of initialization being performed 4177/// 4178/// \returns the constructor used to initialize the object, if successful. 4179/// Otherwise, emits a diagnostic and returns NULL. 4180CXXConstructorDecl * 4181Sema::TryInitializationByConstructor(QualType ClassType, 4182 Expr **Args, unsigned NumArgs, 4183 SourceLocation Loc, 4184 InitializationKind Kind) { 4185 // Build the overload candidate set 4186 OverloadCandidateSet CandidateSet; 4187 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4188 CandidateSet); 4189 4190 // Determine whether we found a constructor we can use. 4191 OverloadCandidateSet::iterator Best; 4192 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4193 case OR_Success: 4194 case OR_Deleted: 4195 // We found a constructor. Return it. 4196 return cast<CXXConstructorDecl>(Best->Function); 4197 4198 case OR_No_Viable_Function: 4199 case OR_Ambiguous: 4200 // Overload resolution failed. Return nothing. 4201 return 0; 4202 } 4203 4204 // Silence GCC warning 4205 return 0; 4206} 4207 4208/// \brief Given a constructor and the set of arguments provided for the 4209/// constructor, convert the arguments and add any required default arguments 4210/// to form a proper call to this constructor. 4211/// 4212/// \returns true if an error occurred, false otherwise. 4213bool 4214Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4215 MultiExprArg ArgsPtr, 4216 SourceLocation Loc, 4217 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4218 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4219 unsigned NumArgs = ArgsPtr.size(); 4220 Expr **Args = (Expr **)ArgsPtr.get(); 4221 4222 const FunctionProtoType *Proto 4223 = Constructor->getType()->getAs<FunctionProtoType>(); 4224 assert(Proto && "Constructor without a prototype?"); 4225 unsigned NumArgsInProto = Proto->getNumArgs(); 4226 4227 // If too few arguments are available, we'll fill in the rest with defaults. 4228 if (NumArgs < NumArgsInProto) 4229 ConvertedArgs.reserve(NumArgsInProto); 4230 else 4231 ConvertedArgs.reserve(NumArgs); 4232 4233 VariadicCallType CallType = 4234 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4235 llvm::SmallVector<Expr *, 8> AllArgs; 4236 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4237 Proto, 0, Args, NumArgs, AllArgs, 4238 CallType); 4239 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4240 ConvertedArgs.push_back(AllArgs[i]); 4241 return Invalid; 4242} 4243 4244/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4245/// determine whether they are reference-related, 4246/// reference-compatible, reference-compatible with added 4247/// qualification, or incompatible, for use in C++ initialization by 4248/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4249/// type, and the first type (T1) is the pointee type of the reference 4250/// type being initialized. 4251Sema::ReferenceCompareResult 4252Sema::CompareReferenceRelationship(SourceLocation Loc, 4253 QualType OrigT1, QualType OrigT2, 4254 bool& DerivedToBase) { 4255 assert(!OrigT1->isReferenceType() && 4256 "T1 must be the pointee type of the reference type"); 4257 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4258 4259 QualType T1 = Context.getCanonicalType(OrigT1); 4260 QualType T2 = Context.getCanonicalType(OrigT2); 4261 Qualifiers T1Quals, T2Quals; 4262 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4263 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4264 4265 // C++ [dcl.init.ref]p4: 4266 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4267 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4268 // T1 is a base class of T2. 4269 if (UnqualT1 == UnqualT2) 4270 DerivedToBase = false; 4271 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4272 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4273 IsDerivedFrom(UnqualT2, UnqualT1)) 4274 DerivedToBase = true; 4275 else 4276 return Ref_Incompatible; 4277 4278 // At this point, we know that T1 and T2 are reference-related (at 4279 // least). 4280 4281 // If the type is an array type, promote the element qualifiers to the type 4282 // for comparison. 4283 if (isa<ArrayType>(T1) && T1Quals) 4284 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4285 if (isa<ArrayType>(T2) && T2Quals) 4286 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4287 4288 // C++ [dcl.init.ref]p4: 4289 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4290 // reference-related to T2 and cv1 is the same cv-qualification 4291 // as, or greater cv-qualification than, cv2. For purposes of 4292 // overload resolution, cases for which cv1 is greater 4293 // cv-qualification than cv2 are identified as 4294 // reference-compatible with added qualification (see 13.3.3.2). 4295 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4296 return Ref_Compatible; 4297 else if (T1.isMoreQualifiedThan(T2)) 4298 return Ref_Compatible_With_Added_Qualification; 4299 else 4300 return Ref_Related; 4301} 4302 4303/// CheckReferenceInit - Check the initialization of a reference 4304/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4305/// the initializer (either a simple initializer or an initializer 4306/// list), and DeclType is the type of the declaration. When ICS is 4307/// non-null, this routine will compute the implicit conversion 4308/// sequence according to C++ [over.ics.ref] and will not produce any 4309/// diagnostics; when ICS is null, it will emit diagnostics when any 4310/// errors are found. Either way, a return value of true indicates 4311/// that there was a failure, a return value of false indicates that 4312/// the reference initialization succeeded. 4313/// 4314/// When @p SuppressUserConversions, user-defined conversions are 4315/// suppressed. 4316/// When @p AllowExplicit, we also permit explicit user-defined 4317/// conversion functions. 4318/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4319/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4320/// This is used when this is called from a C-style cast. 4321bool 4322Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4323 SourceLocation DeclLoc, 4324 bool SuppressUserConversions, 4325 bool AllowExplicit, bool ForceRValue, 4326 ImplicitConversionSequence *ICS, 4327 bool IgnoreBaseAccess) { 4328 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4329 4330 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4331 QualType T2 = Init->getType(); 4332 4333 // If the initializer is the address of an overloaded function, try 4334 // to resolve the overloaded function. If all goes well, T2 is the 4335 // type of the resulting function. 4336 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4337 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4338 ICS != 0); 4339 if (Fn) { 4340 // Since we're performing this reference-initialization for 4341 // real, update the initializer with the resulting function. 4342 if (!ICS) { 4343 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4344 return true; 4345 4346 Init = FixOverloadedFunctionReference(Init, Fn); 4347 } 4348 4349 T2 = Fn->getType(); 4350 } 4351 } 4352 4353 // Compute some basic properties of the types and the initializer. 4354 bool isRValRef = DeclType->isRValueReferenceType(); 4355 bool DerivedToBase = false; 4356 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4357 Init->isLvalue(Context); 4358 ReferenceCompareResult RefRelationship 4359 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4360 4361 // Most paths end in a failed conversion. 4362 if (ICS) { 4363 ICS->setBad(); 4364 ICS->Bad.init(BadConversionSequence::no_conversion, Init, DeclType); 4365 } 4366 4367 // C++ [dcl.init.ref]p5: 4368 // A reference to type "cv1 T1" is initialized by an expression 4369 // of type "cv2 T2" as follows: 4370 4371 // -- If the initializer expression 4372 4373 // Rvalue references cannot bind to lvalues (N2812). 4374 // There is absolutely no situation where they can. In particular, note that 4375 // this is ill-formed, even if B has a user-defined conversion to A&&: 4376 // B b; 4377 // A&& r = b; 4378 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4379 if (!ICS) 4380 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4381 << Init->getSourceRange(); 4382 return true; 4383 } 4384 4385 bool BindsDirectly = false; 4386 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4387 // reference-compatible with "cv2 T2," or 4388 // 4389 // Note that the bit-field check is skipped if we are just computing 4390 // the implicit conversion sequence (C++ [over.best.ics]p2). 4391 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4392 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4393 BindsDirectly = true; 4394 4395 if (ICS) { 4396 // C++ [over.ics.ref]p1: 4397 // When a parameter of reference type binds directly (8.5.3) 4398 // to an argument expression, the implicit conversion sequence 4399 // is the identity conversion, unless the argument expression 4400 // has a type that is a derived class of the parameter type, 4401 // in which case the implicit conversion sequence is a 4402 // derived-to-base Conversion (13.3.3.1). 4403 ICS->setStandard(); 4404 ICS->Standard.First = ICK_Identity; 4405 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4406 ICS->Standard.Third = ICK_Identity; 4407 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4408 ICS->Standard.setToType(0, T2); 4409 ICS->Standard.setToType(1, T1); 4410 ICS->Standard.setToType(2, T1); 4411 ICS->Standard.ReferenceBinding = true; 4412 ICS->Standard.DirectBinding = true; 4413 ICS->Standard.RRefBinding = false; 4414 ICS->Standard.CopyConstructor = 0; 4415 4416 // Nothing more to do: the inaccessibility/ambiguity check for 4417 // derived-to-base conversions is suppressed when we're 4418 // computing the implicit conversion sequence (C++ 4419 // [over.best.ics]p2). 4420 return false; 4421 } else { 4422 // Perform the conversion. 4423 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4424 if (DerivedToBase) 4425 CK = CastExpr::CK_DerivedToBase; 4426 else if(CheckExceptionSpecCompatibility(Init, T1)) 4427 return true; 4428 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4429 } 4430 } 4431 4432 // -- has a class type (i.e., T2 is a class type) and can be 4433 // implicitly converted to an lvalue of type "cv3 T3," 4434 // where "cv1 T1" is reference-compatible with "cv3 T3" 4435 // 92) (this conversion is selected by enumerating the 4436 // applicable conversion functions (13.3.1.6) and choosing 4437 // the best one through overload resolution (13.3)), 4438 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4439 !RequireCompleteType(DeclLoc, T2, 0)) { 4440 CXXRecordDecl *T2RecordDecl 4441 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4442 4443 OverloadCandidateSet CandidateSet; 4444 const UnresolvedSetImpl *Conversions 4445 = T2RecordDecl->getVisibleConversionFunctions(); 4446 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4447 E = Conversions->end(); I != E; ++I) { 4448 NamedDecl *D = *I; 4449 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4450 if (isa<UsingShadowDecl>(D)) 4451 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4452 4453 FunctionTemplateDecl *ConvTemplate 4454 = dyn_cast<FunctionTemplateDecl>(D); 4455 CXXConversionDecl *Conv; 4456 if (ConvTemplate) 4457 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4458 else 4459 Conv = cast<CXXConversionDecl>(D); 4460 4461 // If the conversion function doesn't return a reference type, 4462 // it can't be considered for this conversion. 4463 if (Conv->getConversionType()->isLValueReferenceType() && 4464 (AllowExplicit || !Conv->isExplicit())) { 4465 if (ConvTemplate) 4466 AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), ActingDC, 4467 Init, DeclType, CandidateSet); 4468 else 4469 AddConversionCandidate(Conv, I.getAccess(), ActingDC, Init, 4470 DeclType, CandidateSet); 4471 } 4472 } 4473 4474 OverloadCandidateSet::iterator Best; 4475 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4476 case OR_Success: 4477 // This is a direct binding. 4478 BindsDirectly = true; 4479 4480 if (ICS) { 4481 // C++ [over.ics.ref]p1: 4482 // 4483 // [...] If the parameter binds directly to the result of 4484 // applying a conversion function to the argument 4485 // expression, the implicit conversion sequence is a 4486 // user-defined conversion sequence (13.3.3.1.2), with the 4487 // second standard conversion sequence either an identity 4488 // conversion or, if the conversion function returns an 4489 // entity of a type that is a derived class of the parameter 4490 // type, a derived-to-base Conversion. 4491 ICS->setUserDefined(); 4492 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4493 ICS->UserDefined.After = Best->FinalConversion; 4494 ICS->UserDefined.ConversionFunction = Best->Function; 4495 ICS->UserDefined.EllipsisConversion = false; 4496 assert(ICS->UserDefined.After.ReferenceBinding && 4497 ICS->UserDefined.After.DirectBinding && 4498 "Expected a direct reference binding!"); 4499 return false; 4500 } else { 4501 OwningExprResult InitConversion = 4502 BuildCXXCastArgument(DeclLoc, QualType(), 4503 CastExpr::CK_UserDefinedConversion, 4504 cast<CXXMethodDecl>(Best->Function), 4505 Owned(Init)); 4506 Init = InitConversion.takeAs<Expr>(); 4507 4508 if (CheckExceptionSpecCompatibility(Init, T1)) 4509 return true; 4510 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4511 /*isLvalue=*/true); 4512 } 4513 break; 4514 4515 case OR_Ambiguous: 4516 if (ICS) { 4517 ICS->setAmbiguous(); 4518 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4519 Cand != CandidateSet.end(); ++Cand) 4520 if (Cand->Viable) 4521 ICS->Ambiguous.addConversion(Cand->Function); 4522 break; 4523 } 4524 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4525 << Init->getSourceRange(); 4526 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4527 return true; 4528 4529 case OR_No_Viable_Function: 4530 case OR_Deleted: 4531 // There was no suitable conversion, or we found a deleted 4532 // conversion; continue with other checks. 4533 break; 4534 } 4535 } 4536 4537 if (BindsDirectly) { 4538 // C++ [dcl.init.ref]p4: 4539 // [...] In all cases where the reference-related or 4540 // reference-compatible relationship of two types is used to 4541 // establish the validity of a reference binding, and T1 is a 4542 // base class of T2, a program that necessitates such a binding 4543 // is ill-formed if T1 is an inaccessible (clause 11) or 4544 // ambiguous (10.2) base class of T2. 4545 // 4546 // Note that we only check this condition when we're allowed to 4547 // complain about errors, because we should not be checking for 4548 // ambiguity (or inaccessibility) unless the reference binding 4549 // actually happens. 4550 if (DerivedToBase) 4551 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4552 Init->getSourceRange(), 4553 IgnoreBaseAccess); 4554 else 4555 return false; 4556 } 4557 4558 // -- Otherwise, the reference shall be to a non-volatile const 4559 // type (i.e., cv1 shall be const), or the reference shall be an 4560 // rvalue reference and the initializer expression shall be an rvalue. 4561 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4562 if (!ICS) 4563 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4564 << T1.isVolatileQualified() 4565 << T1 << int(InitLvalue != Expr::LV_Valid) 4566 << T2 << Init->getSourceRange(); 4567 return true; 4568 } 4569 4570 // -- If the initializer expression is an rvalue, with T2 a 4571 // class type, and "cv1 T1" is reference-compatible with 4572 // "cv2 T2," the reference is bound in one of the 4573 // following ways (the choice is implementation-defined): 4574 // 4575 // -- The reference is bound to the object represented by 4576 // the rvalue (see 3.10) or to a sub-object within that 4577 // object. 4578 // 4579 // -- A temporary of type "cv1 T2" [sic] is created, and 4580 // a constructor is called to copy the entire rvalue 4581 // object into the temporary. The reference is bound to 4582 // the temporary or to a sub-object within the 4583 // temporary. 4584 // 4585 // The constructor that would be used to make the copy 4586 // shall be callable whether or not the copy is actually 4587 // done. 4588 // 4589 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4590 // freedom, so we will always take the first option and never build 4591 // a temporary in this case. FIXME: We will, however, have to check 4592 // for the presence of a copy constructor in C++98/03 mode. 4593 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4594 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4595 if (ICS) { 4596 ICS->setStandard(); 4597 ICS->Standard.First = ICK_Identity; 4598 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4599 ICS->Standard.Third = ICK_Identity; 4600 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4601 ICS->Standard.setToType(0, T2); 4602 ICS->Standard.setToType(1, T1); 4603 ICS->Standard.setToType(2, T1); 4604 ICS->Standard.ReferenceBinding = true; 4605 ICS->Standard.DirectBinding = false; 4606 ICS->Standard.RRefBinding = isRValRef; 4607 ICS->Standard.CopyConstructor = 0; 4608 } else { 4609 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4610 if (DerivedToBase) 4611 CK = CastExpr::CK_DerivedToBase; 4612 else if(CheckExceptionSpecCompatibility(Init, T1)) 4613 return true; 4614 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4615 } 4616 return false; 4617 } 4618 4619 // -- Otherwise, a temporary of type "cv1 T1" is created and 4620 // initialized from the initializer expression using the 4621 // rules for a non-reference copy initialization (8.5). The 4622 // reference is then bound to the temporary. If T1 is 4623 // reference-related to T2, cv1 must be the same 4624 // cv-qualification as, or greater cv-qualification than, 4625 // cv2; otherwise, the program is ill-formed. 4626 if (RefRelationship == Ref_Related) { 4627 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4628 // we would be reference-compatible or reference-compatible with 4629 // added qualification. But that wasn't the case, so the reference 4630 // initialization fails. 4631 if (!ICS) 4632 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4633 << T1 << int(InitLvalue != Expr::LV_Valid) 4634 << T2 << Init->getSourceRange(); 4635 return true; 4636 } 4637 4638 // If at least one of the types is a class type, the types are not 4639 // related, and we aren't allowed any user conversions, the 4640 // reference binding fails. This case is important for breaking 4641 // recursion, since TryImplicitConversion below will attempt to 4642 // create a temporary through the use of a copy constructor. 4643 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4644 (T1->isRecordType() || T2->isRecordType())) { 4645 if (!ICS) 4646 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4647 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4648 return true; 4649 } 4650 4651 // Actually try to convert the initializer to T1. 4652 if (ICS) { 4653 // C++ [over.ics.ref]p2: 4654 // 4655 // When a parameter of reference type is not bound directly to 4656 // an argument expression, the conversion sequence is the one 4657 // required to convert the argument expression to the 4658 // underlying type of the reference according to 4659 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4660 // to copy-initializing a temporary of the underlying type with 4661 // the argument expression. Any difference in top-level 4662 // cv-qualification is subsumed by the initialization itself 4663 // and does not constitute a conversion. 4664 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4665 /*AllowExplicit=*/false, 4666 /*ForceRValue=*/false, 4667 /*InOverloadResolution=*/false); 4668 4669 // Of course, that's still a reference binding. 4670 if (ICS->isStandard()) { 4671 ICS->Standard.ReferenceBinding = true; 4672 ICS->Standard.RRefBinding = isRValRef; 4673 } else if (ICS->isUserDefined()) { 4674 ICS->UserDefined.After.ReferenceBinding = true; 4675 ICS->UserDefined.After.RRefBinding = isRValRef; 4676 } 4677 return ICS->isBad(); 4678 } else { 4679 ImplicitConversionSequence Conversions; 4680 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4681 false, false, 4682 Conversions); 4683 if (badConversion) { 4684 if (Conversions.isAmbiguous()) { 4685 Diag(DeclLoc, 4686 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4687 for (int j = Conversions.Ambiguous.conversions().size()-1; 4688 j >= 0; j--) { 4689 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4690 NoteOverloadCandidate(Func); 4691 } 4692 } 4693 else { 4694 if (isRValRef) 4695 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4696 << Init->getSourceRange(); 4697 else 4698 Diag(DeclLoc, diag::err_invalid_initialization) 4699 << DeclType << Init->getType() << Init->getSourceRange(); 4700 } 4701 } 4702 return badConversion; 4703 } 4704} 4705 4706static inline bool 4707CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4708 const FunctionDecl *FnDecl) { 4709 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4710 if (isa<NamespaceDecl>(DC)) { 4711 return SemaRef.Diag(FnDecl->getLocation(), 4712 diag::err_operator_new_delete_declared_in_namespace) 4713 << FnDecl->getDeclName(); 4714 } 4715 4716 if (isa<TranslationUnitDecl>(DC) && 4717 FnDecl->getStorageClass() == FunctionDecl::Static) { 4718 return SemaRef.Diag(FnDecl->getLocation(), 4719 diag::err_operator_new_delete_declared_static) 4720 << FnDecl->getDeclName(); 4721 } 4722 4723 return false; 4724} 4725 4726static inline bool 4727CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4728 CanQualType ExpectedResultType, 4729 CanQualType ExpectedFirstParamType, 4730 unsigned DependentParamTypeDiag, 4731 unsigned InvalidParamTypeDiag) { 4732 QualType ResultType = 4733 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4734 4735 // Check that the result type is not dependent. 4736 if (ResultType->isDependentType()) 4737 return SemaRef.Diag(FnDecl->getLocation(), 4738 diag::err_operator_new_delete_dependent_result_type) 4739 << FnDecl->getDeclName() << ExpectedResultType; 4740 4741 // Check that the result type is what we expect. 4742 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4743 return SemaRef.Diag(FnDecl->getLocation(), 4744 diag::err_operator_new_delete_invalid_result_type) 4745 << FnDecl->getDeclName() << ExpectedResultType; 4746 4747 // A function template must have at least 2 parameters. 4748 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4749 return SemaRef.Diag(FnDecl->getLocation(), 4750 diag::err_operator_new_delete_template_too_few_parameters) 4751 << FnDecl->getDeclName(); 4752 4753 // The function decl must have at least 1 parameter. 4754 if (FnDecl->getNumParams() == 0) 4755 return SemaRef.Diag(FnDecl->getLocation(), 4756 diag::err_operator_new_delete_too_few_parameters) 4757 << FnDecl->getDeclName(); 4758 4759 // Check the the first parameter type is not dependent. 4760 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4761 if (FirstParamType->isDependentType()) 4762 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4763 << FnDecl->getDeclName() << ExpectedFirstParamType; 4764 4765 // Check that the first parameter type is what we expect. 4766 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4767 ExpectedFirstParamType) 4768 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4769 << FnDecl->getDeclName() << ExpectedFirstParamType; 4770 4771 return false; 4772} 4773 4774static bool 4775CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4776 // C++ [basic.stc.dynamic.allocation]p1: 4777 // A program is ill-formed if an allocation function is declared in a 4778 // namespace scope other than global scope or declared static in global 4779 // scope. 4780 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4781 return true; 4782 4783 CanQualType SizeTy = 4784 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4785 4786 // C++ [basic.stc.dynamic.allocation]p1: 4787 // The return type shall be void*. The first parameter shall have type 4788 // std::size_t. 4789 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4790 SizeTy, 4791 diag::err_operator_new_dependent_param_type, 4792 diag::err_operator_new_param_type)) 4793 return true; 4794 4795 // C++ [basic.stc.dynamic.allocation]p1: 4796 // The first parameter shall not have an associated default argument. 4797 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4798 return SemaRef.Diag(FnDecl->getLocation(), 4799 diag::err_operator_new_default_arg) 4800 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4801 4802 return false; 4803} 4804 4805static bool 4806CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4807 // C++ [basic.stc.dynamic.deallocation]p1: 4808 // A program is ill-formed if deallocation functions are declared in a 4809 // namespace scope other than global scope or declared static in global 4810 // scope. 4811 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4812 return true; 4813 4814 // C++ [basic.stc.dynamic.deallocation]p2: 4815 // Each deallocation function shall return void and its first parameter 4816 // shall be void*. 4817 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4818 SemaRef.Context.VoidPtrTy, 4819 diag::err_operator_delete_dependent_param_type, 4820 diag::err_operator_delete_param_type)) 4821 return true; 4822 4823 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4824 if (FirstParamType->isDependentType()) 4825 return SemaRef.Diag(FnDecl->getLocation(), 4826 diag::err_operator_delete_dependent_param_type) 4827 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4828 4829 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4830 SemaRef.Context.VoidPtrTy) 4831 return SemaRef.Diag(FnDecl->getLocation(), 4832 diag::err_operator_delete_param_type) 4833 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4834 4835 return false; 4836} 4837 4838/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4839/// of this overloaded operator is well-formed. If so, returns false; 4840/// otherwise, emits appropriate diagnostics and returns true. 4841bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4842 assert(FnDecl && FnDecl->isOverloadedOperator() && 4843 "Expected an overloaded operator declaration"); 4844 4845 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4846 4847 // C++ [over.oper]p5: 4848 // The allocation and deallocation functions, operator new, 4849 // operator new[], operator delete and operator delete[], are 4850 // described completely in 3.7.3. The attributes and restrictions 4851 // found in the rest of this subclause do not apply to them unless 4852 // explicitly stated in 3.7.3. 4853 if (Op == OO_Delete || Op == OO_Array_Delete) 4854 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4855 4856 if (Op == OO_New || Op == OO_Array_New) 4857 return CheckOperatorNewDeclaration(*this, FnDecl); 4858 4859 // C++ [over.oper]p6: 4860 // An operator function shall either be a non-static member 4861 // function or be a non-member function and have at least one 4862 // parameter whose type is a class, a reference to a class, an 4863 // enumeration, or a reference to an enumeration. 4864 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4865 if (MethodDecl->isStatic()) 4866 return Diag(FnDecl->getLocation(), 4867 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4868 } else { 4869 bool ClassOrEnumParam = false; 4870 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4871 ParamEnd = FnDecl->param_end(); 4872 Param != ParamEnd; ++Param) { 4873 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4874 if (ParamType->isDependentType() || ParamType->isRecordType() || 4875 ParamType->isEnumeralType()) { 4876 ClassOrEnumParam = true; 4877 break; 4878 } 4879 } 4880 4881 if (!ClassOrEnumParam) 4882 return Diag(FnDecl->getLocation(), 4883 diag::err_operator_overload_needs_class_or_enum) 4884 << FnDecl->getDeclName(); 4885 } 4886 4887 // C++ [over.oper]p8: 4888 // An operator function cannot have default arguments (8.3.6), 4889 // except where explicitly stated below. 4890 // 4891 // Only the function-call operator allows default arguments 4892 // (C++ [over.call]p1). 4893 if (Op != OO_Call) { 4894 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4895 Param != FnDecl->param_end(); ++Param) { 4896 if ((*Param)->hasDefaultArg()) 4897 return Diag((*Param)->getLocation(), 4898 diag::err_operator_overload_default_arg) 4899 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4900 } 4901 } 4902 4903 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4904 { false, false, false } 4905#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4906 , { Unary, Binary, MemberOnly } 4907#include "clang/Basic/OperatorKinds.def" 4908 }; 4909 4910 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4911 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4912 bool MustBeMemberOperator = OperatorUses[Op][2]; 4913 4914 // C++ [over.oper]p8: 4915 // [...] Operator functions cannot have more or fewer parameters 4916 // than the number required for the corresponding operator, as 4917 // described in the rest of this subclause. 4918 unsigned NumParams = FnDecl->getNumParams() 4919 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4920 if (Op != OO_Call && 4921 ((NumParams == 1 && !CanBeUnaryOperator) || 4922 (NumParams == 2 && !CanBeBinaryOperator) || 4923 (NumParams < 1) || (NumParams > 2))) { 4924 // We have the wrong number of parameters. 4925 unsigned ErrorKind; 4926 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4927 ErrorKind = 2; // 2 -> unary or binary. 4928 } else if (CanBeUnaryOperator) { 4929 ErrorKind = 0; // 0 -> unary 4930 } else { 4931 assert(CanBeBinaryOperator && 4932 "All non-call overloaded operators are unary or binary!"); 4933 ErrorKind = 1; // 1 -> binary 4934 } 4935 4936 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4937 << FnDecl->getDeclName() << NumParams << ErrorKind; 4938 } 4939 4940 // Overloaded operators other than operator() cannot be variadic. 4941 if (Op != OO_Call && 4942 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4943 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4944 << FnDecl->getDeclName(); 4945 } 4946 4947 // Some operators must be non-static member functions. 4948 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4949 return Diag(FnDecl->getLocation(), 4950 diag::err_operator_overload_must_be_member) 4951 << FnDecl->getDeclName(); 4952 } 4953 4954 // C++ [over.inc]p1: 4955 // The user-defined function called operator++ implements the 4956 // prefix and postfix ++ operator. If this function is a member 4957 // function with no parameters, or a non-member function with one 4958 // parameter of class or enumeration type, it defines the prefix 4959 // increment operator ++ for objects of that type. If the function 4960 // is a member function with one parameter (which shall be of type 4961 // int) or a non-member function with two parameters (the second 4962 // of which shall be of type int), it defines the postfix 4963 // increment operator ++ for objects of that type. 4964 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4965 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4966 bool ParamIsInt = false; 4967 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4968 ParamIsInt = BT->getKind() == BuiltinType::Int; 4969 4970 if (!ParamIsInt) 4971 return Diag(LastParam->getLocation(), 4972 diag::err_operator_overload_post_incdec_must_be_int) 4973 << LastParam->getType() << (Op == OO_MinusMinus); 4974 } 4975 4976 // Notify the class if it got an assignment operator. 4977 if (Op == OO_Equal) { 4978 // Would have returned earlier otherwise. 4979 assert(isa<CXXMethodDecl>(FnDecl) && 4980 "Overloaded = not member, but not filtered."); 4981 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4982 Method->getParent()->addedAssignmentOperator(Context, Method); 4983 } 4984 4985 return false; 4986} 4987 4988/// CheckLiteralOperatorDeclaration - Check whether the declaration 4989/// of this literal operator function is well-formed. If so, returns 4990/// false; otherwise, emits appropriate diagnostics and returns true. 4991bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4992 DeclContext *DC = FnDecl->getDeclContext(); 4993 Decl::Kind Kind = DC->getDeclKind(); 4994 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4995 Kind != Decl::LinkageSpec) { 4996 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4997 << FnDecl->getDeclName(); 4998 return true; 4999 } 5000 5001 bool Valid = false; 5002 5003 // FIXME: Check for the one valid template signature 5004 // template <char...> type operator "" name(); 5005 5006 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5007 // Check the first parameter 5008 QualType T = (*Param)->getType(); 5009 5010 // unsigned long long int and long double are allowed, but only 5011 // alone. 5012 // We also allow any character type; their omission seems to be a bug 5013 // in n3000 5014 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5015 Context.hasSameType(T, Context.LongDoubleTy) || 5016 Context.hasSameType(T, Context.CharTy) || 5017 Context.hasSameType(T, Context.WCharTy) || 5018 Context.hasSameType(T, Context.Char16Ty) || 5019 Context.hasSameType(T, Context.Char32Ty)) { 5020 if (++Param == FnDecl->param_end()) 5021 Valid = true; 5022 goto FinishedParams; 5023 } 5024 5025 // Otherwise it must be a pointer to const; let's strip those. 5026 const PointerType *PT = T->getAs<PointerType>(); 5027 if (!PT) 5028 goto FinishedParams; 5029 T = PT->getPointeeType(); 5030 if (!T.isConstQualified()) 5031 goto FinishedParams; 5032 T = T.getUnqualifiedType(); 5033 5034 // Move on to the second parameter; 5035 ++Param; 5036 5037 // If there is no second parameter, the first must be a const char * 5038 if (Param == FnDecl->param_end()) { 5039 if (Context.hasSameType(T, Context.CharTy)) 5040 Valid = true; 5041 goto FinishedParams; 5042 } 5043 5044 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5045 // are allowed as the first parameter to a two-parameter function 5046 if (!(Context.hasSameType(T, Context.CharTy) || 5047 Context.hasSameType(T, Context.WCharTy) || 5048 Context.hasSameType(T, Context.Char16Ty) || 5049 Context.hasSameType(T, Context.Char32Ty))) 5050 goto FinishedParams; 5051 5052 // The second and final parameter must be an std::size_t 5053 T = (*Param)->getType().getUnqualifiedType(); 5054 if (Context.hasSameType(T, Context.getSizeType()) && 5055 ++Param == FnDecl->param_end()) 5056 Valid = true; 5057 } 5058 5059 // FIXME: This diagnostic is absolutely terrible. 5060FinishedParams: 5061 if (!Valid) { 5062 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5063 << FnDecl->getDeclName(); 5064 return true; 5065 } 5066 5067 return false; 5068} 5069 5070/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5071/// linkage specification, including the language and (if present) 5072/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5073/// the location of the language string literal, which is provided 5074/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5075/// the '{' brace. Otherwise, this linkage specification does not 5076/// have any braces. 5077Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5078 SourceLocation ExternLoc, 5079 SourceLocation LangLoc, 5080 const char *Lang, 5081 unsigned StrSize, 5082 SourceLocation LBraceLoc) { 5083 LinkageSpecDecl::LanguageIDs Language; 5084 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5085 Language = LinkageSpecDecl::lang_c; 5086 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5087 Language = LinkageSpecDecl::lang_cxx; 5088 else { 5089 Diag(LangLoc, diag::err_bad_language); 5090 return DeclPtrTy(); 5091 } 5092 5093 // FIXME: Add all the various semantics of linkage specifications 5094 5095 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5096 LangLoc, Language, 5097 LBraceLoc.isValid()); 5098 CurContext->addDecl(D); 5099 PushDeclContext(S, D); 5100 return DeclPtrTy::make(D); 5101} 5102 5103/// ActOnFinishLinkageSpecification - Completely the definition of 5104/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5105/// valid, it's the position of the closing '}' brace in a linkage 5106/// specification that uses braces. 5107Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5108 DeclPtrTy LinkageSpec, 5109 SourceLocation RBraceLoc) { 5110 if (LinkageSpec) 5111 PopDeclContext(); 5112 return LinkageSpec; 5113} 5114 5115/// \brief Perform semantic analysis for the variable declaration that 5116/// occurs within a C++ catch clause, returning the newly-created 5117/// variable. 5118VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5119 TypeSourceInfo *TInfo, 5120 IdentifierInfo *Name, 5121 SourceLocation Loc, 5122 SourceRange Range) { 5123 bool Invalid = false; 5124 5125 // Arrays and functions decay. 5126 if (ExDeclType->isArrayType()) 5127 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5128 else if (ExDeclType->isFunctionType()) 5129 ExDeclType = Context.getPointerType(ExDeclType); 5130 5131 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5132 // The exception-declaration shall not denote a pointer or reference to an 5133 // incomplete type, other than [cv] void*. 5134 // N2844 forbids rvalue references. 5135 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5136 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5137 Invalid = true; 5138 } 5139 5140 QualType BaseType = ExDeclType; 5141 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5142 unsigned DK = diag::err_catch_incomplete; 5143 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5144 BaseType = Ptr->getPointeeType(); 5145 Mode = 1; 5146 DK = diag::err_catch_incomplete_ptr; 5147 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5148 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5149 BaseType = Ref->getPointeeType(); 5150 Mode = 2; 5151 DK = diag::err_catch_incomplete_ref; 5152 } 5153 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5154 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5155 Invalid = true; 5156 5157 if (!Invalid && !ExDeclType->isDependentType() && 5158 RequireNonAbstractType(Loc, ExDeclType, 5159 diag::err_abstract_type_in_decl, 5160 AbstractVariableType)) 5161 Invalid = true; 5162 5163 // FIXME: Need to test for ability to copy-construct and destroy the 5164 // exception variable. 5165 5166 // FIXME: Need to check for abstract classes. 5167 5168 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5169 Name, ExDeclType, TInfo, VarDecl::None); 5170 5171 if (Invalid) 5172 ExDecl->setInvalidDecl(); 5173 5174 return ExDecl; 5175} 5176 5177/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5178/// handler. 5179Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5180 TypeSourceInfo *TInfo = 0; 5181 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5182 5183 bool Invalid = D.isInvalidType(); 5184 IdentifierInfo *II = D.getIdentifier(); 5185 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5186 // The scope should be freshly made just for us. There is just no way 5187 // it contains any previous declaration. 5188 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5189 if (PrevDecl->isTemplateParameter()) { 5190 // Maybe we will complain about the shadowed template parameter. 5191 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5192 } 5193 } 5194 5195 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5196 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5197 << D.getCXXScopeSpec().getRange(); 5198 Invalid = true; 5199 } 5200 5201 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5202 D.getIdentifier(), 5203 D.getIdentifierLoc(), 5204 D.getDeclSpec().getSourceRange()); 5205 5206 if (Invalid) 5207 ExDecl->setInvalidDecl(); 5208 5209 // Add the exception declaration into this scope. 5210 if (II) 5211 PushOnScopeChains(ExDecl, S); 5212 else 5213 CurContext->addDecl(ExDecl); 5214 5215 ProcessDeclAttributes(S, ExDecl, D); 5216 return DeclPtrTy::make(ExDecl); 5217} 5218 5219Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5220 ExprArg assertexpr, 5221 ExprArg assertmessageexpr) { 5222 Expr *AssertExpr = (Expr *)assertexpr.get(); 5223 StringLiteral *AssertMessage = 5224 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5225 5226 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5227 llvm::APSInt Value(32); 5228 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5229 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5230 AssertExpr->getSourceRange(); 5231 return DeclPtrTy(); 5232 } 5233 5234 if (Value == 0) { 5235 Diag(AssertLoc, diag::err_static_assert_failed) 5236 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5237 } 5238 } 5239 5240 assertexpr.release(); 5241 assertmessageexpr.release(); 5242 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5243 AssertExpr, AssertMessage); 5244 5245 CurContext->addDecl(Decl); 5246 return DeclPtrTy::make(Decl); 5247} 5248 5249/// Handle a friend type declaration. This works in tandem with 5250/// ActOnTag. 5251/// 5252/// Notes on friend class templates: 5253/// 5254/// We generally treat friend class declarations as if they were 5255/// declaring a class. So, for example, the elaborated type specifier 5256/// in a friend declaration is required to obey the restrictions of a 5257/// class-head (i.e. no typedefs in the scope chain), template 5258/// parameters are required to match up with simple template-ids, &c. 5259/// However, unlike when declaring a template specialization, it's 5260/// okay to refer to a template specialization without an empty 5261/// template parameter declaration, e.g. 5262/// friend class A<T>::B<unsigned>; 5263/// We permit this as a special case; if there are any template 5264/// parameters present at all, require proper matching, i.e. 5265/// template <> template <class T> friend class A<int>::B; 5266Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5267 MultiTemplateParamsArg TempParams) { 5268 SourceLocation Loc = DS.getSourceRange().getBegin(); 5269 5270 assert(DS.isFriendSpecified()); 5271 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5272 5273 // Try to convert the decl specifier to a type. This works for 5274 // friend templates because ActOnTag never produces a ClassTemplateDecl 5275 // for a TUK_Friend. 5276 Declarator TheDeclarator(DS, Declarator::MemberContext); 5277 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5278 if (TheDeclarator.isInvalidType()) 5279 return DeclPtrTy(); 5280 5281 // This is definitely an error in C++98. It's probably meant to 5282 // be forbidden in C++0x, too, but the specification is just 5283 // poorly written. 5284 // 5285 // The problem is with declarations like the following: 5286 // template <T> friend A<T>::foo; 5287 // where deciding whether a class C is a friend or not now hinges 5288 // on whether there exists an instantiation of A that causes 5289 // 'foo' to equal C. There are restrictions on class-heads 5290 // (which we declare (by fiat) elaborated friend declarations to 5291 // be) that makes this tractable. 5292 // 5293 // FIXME: handle "template <> friend class A<T>;", which 5294 // is possibly well-formed? Who even knows? 5295 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5296 Diag(Loc, diag::err_tagless_friend_type_template) 5297 << DS.getSourceRange(); 5298 return DeclPtrTy(); 5299 } 5300 5301 // C++ [class.friend]p2: 5302 // An elaborated-type-specifier shall be used in a friend declaration 5303 // for a class.* 5304 // * The class-key of the elaborated-type-specifier is required. 5305 // This is one of the rare places in Clang where it's legitimate to 5306 // ask about the "spelling" of the type. 5307 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5308 // If we evaluated the type to a record type, suggest putting 5309 // a tag in front. 5310 if (const RecordType *RT = T->getAs<RecordType>()) { 5311 RecordDecl *RD = RT->getDecl(); 5312 5313 std::string InsertionText = std::string(" ") + RD->getKindName(); 5314 5315 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5316 << (unsigned) RD->getTagKind() 5317 << T 5318 << SourceRange(DS.getFriendSpecLoc()) 5319 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5320 InsertionText); 5321 return DeclPtrTy(); 5322 }else { 5323 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5324 << DS.getSourceRange(); 5325 return DeclPtrTy(); 5326 } 5327 } 5328 5329 // Enum types cannot be friends. 5330 if (T->getAs<EnumType>()) { 5331 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5332 << SourceRange(DS.getFriendSpecLoc()); 5333 return DeclPtrTy(); 5334 } 5335 5336 // C++98 [class.friend]p1: A friend of a class is a function 5337 // or class that is not a member of the class . . . 5338 // This is fixed in DR77, which just barely didn't make the C++03 5339 // deadline. It's also a very silly restriction that seriously 5340 // affects inner classes and which nobody else seems to implement; 5341 // thus we never diagnose it, not even in -pedantic. 5342 5343 Decl *D; 5344 if (TempParams.size()) 5345 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5346 TempParams.size(), 5347 (TemplateParameterList**) TempParams.release(), 5348 T.getTypePtr(), 5349 DS.getFriendSpecLoc()); 5350 else 5351 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5352 DS.getFriendSpecLoc()); 5353 D->setAccess(AS_public); 5354 CurContext->addDecl(D); 5355 5356 return DeclPtrTy::make(D); 5357} 5358 5359Sema::DeclPtrTy 5360Sema::ActOnFriendFunctionDecl(Scope *S, 5361 Declarator &D, 5362 bool IsDefinition, 5363 MultiTemplateParamsArg TemplateParams) { 5364 const DeclSpec &DS = D.getDeclSpec(); 5365 5366 assert(DS.isFriendSpecified()); 5367 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5368 5369 SourceLocation Loc = D.getIdentifierLoc(); 5370 TypeSourceInfo *TInfo = 0; 5371 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5372 5373 // C++ [class.friend]p1 5374 // A friend of a class is a function or class.... 5375 // Note that this sees through typedefs, which is intended. 5376 // It *doesn't* see through dependent types, which is correct 5377 // according to [temp.arg.type]p3: 5378 // If a declaration acquires a function type through a 5379 // type dependent on a template-parameter and this causes 5380 // a declaration that does not use the syntactic form of a 5381 // function declarator to have a function type, the program 5382 // is ill-formed. 5383 if (!T->isFunctionType()) { 5384 Diag(Loc, diag::err_unexpected_friend); 5385 5386 // It might be worthwhile to try to recover by creating an 5387 // appropriate declaration. 5388 return DeclPtrTy(); 5389 } 5390 5391 // C++ [namespace.memdef]p3 5392 // - If a friend declaration in a non-local class first declares a 5393 // class or function, the friend class or function is a member 5394 // of the innermost enclosing namespace. 5395 // - The name of the friend is not found by simple name lookup 5396 // until a matching declaration is provided in that namespace 5397 // scope (either before or after the class declaration granting 5398 // friendship). 5399 // - If a friend function is called, its name may be found by the 5400 // name lookup that considers functions from namespaces and 5401 // classes associated with the types of the function arguments. 5402 // - When looking for a prior declaration of a class or a function 5403 // declared as a friend, scopes outside the innermost enclosing 5404 // namespace scope are not considered. 5405 5406 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5407 DeclarationName Name = GetNameForDeclarator(D); 5408 assert(Name); 5409 5410 // The context we found the declaration in, or in which we should 5411 // create the declaration. 5412 DeclContext *DC; 5413 5414 // FIXME: handle local classes 5415 5416 // Recover from invalid scope qualifiers as if they just weren't there. 5417 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5418 ForRedeclaration); 5419 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5420 // FIXME: RequireCompleteDeclContext 5421 DC = computeDeclContext(ScopeQual); 5422 5423 // FIXME: handle dependent contexts 5424 if (!DC) return DeclPtrTy(); 5425 5426 LookupQualifiedName(Previous, DC); 5427 5428 // If searching in that context implicitly found a declaration in 5429 // a different context, treat it like it wasn't found at all. 5430 // TODO: better diagnostics for this case. Suggesting the right 5431 // qualified scope would be nice... 5432 // FIXME: getRepresentativeDecl() is not right here at all 5433 if (Previous.empty() || 5434 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5435 D.setInvalidType(); 5436 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5437 return DeclPtrTy(); 5438 } 5439 5440 // C++ [class.friend]p1: A friend of a class is a function or 5441 // class that is not a member of the class . . . 5442 if (DC->Equals(CurContext)) 5443 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5444 5445 // Otherwise walk out to the nearest namespace scope looking for matches. 5446 } else { 5447 // TODO: handle local class contexts. 5448 5449 DC = CurContext; 5450 while (true) { 5451 // Skip class contexts. If someone can cite chapter and verse 5452 // for this behavior, that would be nice --- it's what GCC and 5453 // EDG do, and it seems like a reasonable intent, but the spec 5454 // really only says that checks for unqualified existing 5455 // declarations should stop at the nearest enclosing namespace, 5456 // not that they should only consider the nearest enclosing 5457 // namespace. 5458 while (DC->isRecord()) 5459 DC = DC->getParent(); 5460 5461 LookupQualifiedName(Previous, DC); 5462 5463 // TODO: decide what we think about using declarations. 5464 if (!Previous.empty()) 5465 break; 5466 5467 if (DC->isFileContext()) break; 5468 DC = DC->getParent(); 5469 } 5470 5471 // C++ [class.friend]p1: A friend of a class is a function or 5472 // class that is not a member of the class . . . 5473 // C++0x changes this for both friend types and functions. 5474 // Most C++ 98 compilers do seem to give an error here, so 5475 // we do, too. 5476 if (!Previous.empty() && DC->Equals(CurContext) 5477 && !getLangOptions().CPlusPlus0x) 5478 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5479 } 5480 5481 if (DC->isFileContext()) { 5482 // This implies that it has to be an operator or function. 5483 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5484 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5485 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5486 Diag(Loc, diag::err_introducing_special_friend) << 5487 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5488 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5489 return DeclPtrTy(); 5490 } 5491 } 5492 5493 bool Redeclaration = false; 5494 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5495 move(TemplateParams), 5496 IsDefinition, 5497 Redeclaration); 5498 if (!ND) return DeclPtrTy(); 5499 5500 assert(ND->getDeclContext() == DC); 5501 assert(ND->getLexicalDeclContext() == CurContext); 5502 5503 // Add the function declaration to the appropriate lookup tables, 5504 // adjusting the redeclarations list as necessary. We don't 5505 // want to do this yet if the friending class is dependent. 5506 // 5507 // Also update the scope-based lookup if the target context's 5508 // lookup context is in lexical scope. 5509 if (!CurContext->isDependentContext()) { 5510 DC = DC->getLookupContext(); 5511 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5512 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5513 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5514 } 5515 5516 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5517 D.getIdentifierLoc(), ND, 5518 DS.getFriendSpecLoc()); 5519 FrD->setAccess(AS_public); 5520 CurContext->addDecl(FrD); 5521 5522 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5523 FrD->setSpecialization(true); 5524 5525 return DeclPtrTy::make(ND); 5526} 5527 5528void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5529 AdjustDeclIfTemplate(dcl); 5530 5531 Decl *Dcl = dcl.getAs<Decl>(); 5532 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5533 if (!Fn) { 5534 Diag(DelLoc, diag::err_deleted_non_function); 5535 return; 5536 } 5537 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5538 Diag(DelLoc, diag::err_deleted_decl_not_first); 5539 Diag(Prev->getLocation(), diag::note_previous_declaration); 5540 // If the declaration wasn't the first, we delete the function anyway for 5541 // recovery. 5542 } 5543 Fn->setDeleted(); 5544} 5545 5546static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5547 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5548 ++CI) { 5549 Stmt *SubStmt = *CI; 5550 if (!SubStmt) 5551 continue; 5552 if (isa<ReturnStmt>(SubStmt)) 5553 Self.Diag(SubStmt->getSourceRange().getBegin(), 5554 diag::err_return_in_constructor_handler); 5555 if (!isa<Expr>(SubStmt)) 5556 SearchForReturnInStmt(Self, SubStmt); 5557 } 5558} 5559 5560void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5561 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5562 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5563 SearchForReturnInStmt(*this, Handler); 5564 } 5565} 5566 5567bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5568 const CXXMethodDecl *Old) { 5569 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5570 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5571 5572 if (Context.hasSameType(NewTy, OldTy)) 5573 return false; 5574 5575 // Check if the return types are covariant 5576 QualType NewClassTy, OldClassTy; 5577 5578 /// Both types must be pointers or references to classes. 5579 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5580 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5581 NewClassTy = NewPT->getPointeeType(); 5582 OldClassTy = OldPT->getPointeeType(); 5583 } 5584 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5585 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5586 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5587 NewClassTy = NewRT->getPointeeType(); 5588 OldClassTy = OldRT->getPointeeType(); 5589 } 5590 } 5591 } 5592 5593 // The return types aren't either both pointers or references to a class type. 5594 if (NewClassTy.isNull()) { 5595 Diag(New->getLocation(), 5596 diag::err_different_return_type_for_overriding_virtual_function) 5597 << New->getDeclName() << NewTy << OldTy; 5598 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5599 5600 return true; 5601 } 5602 5603 // C++ [class.virtual]p6: 5604 // If the return type of D::f differs from the return type of B::f, the 5605 // class type in the return type of D::f shall be complete at the point of 5606 // declaration of D::f or shall be the class type D. 5607 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5608 if (!RT->isBeingDefined() && 5609 RequireCompleteType(New->getLocation(), NewClassTy, 5610 PDiag(diag::err_covariant_return_incomplete) 5611 << New->getDeclName())) 5612 return true; 5613 } 5614 5615 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5616 // Check if the new class derives from the old class. 5617 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5618 Diag(New->getLocation(), 5619 diag::err_covariant_return_not_derived) 5620 << New->getDeclName() << NewTy << OldTy; 5621 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5622 return true; 5623 } 5624 5625 // Check if we the conversion from derived to base is valid. 5626 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5627 diag::err_covariant_return_inaccessible_base, 5628 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5629 // FIXME: Should this point to the return type? 5630 New->getLocation(), SourceRange(), New->getDeclName())) { 5631 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5632 return true; 5633 } 5634 } 5635 5636 // The qualifiers of the return types must be the same. 5637 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5638 Diag(New->getLocation(), 5639 diag::err_covariant_return_type_different_qualifications) 5640 << New->getDeclName() << NewTy << OldTy; 5641 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5642 return true; 5643 }; 5644 5645 5646 // The new class type must have the same or less qualifiers as the old type. 5647 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5648 Diag(New->getLocation(), 5649 diag::err_covariant_return_type_class_type_more_qualified) 5650 << New->getDeclName() << NewTy << OldTy; 5651 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5652 return true; 5653 }; 5654 5655 return false; 5656} 5657 5658bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5659 const CXXMethodDecl *Old) 5660{ 5661 if (Old->hasAttr<FinalAttr>()) { 5662 Diag(New->getLocation(), diag::err_final_function_overridden) 5663 << New->getDeclName(); 5664 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5665 return true; 5666 } 5667 5668 return false; 5669} 5670 5671/// \brief Mark the given method pure. 5672/// 5673/// \param Method the method to be marked pure. 5674/// 5675/// \param InitRange the source range that covers the "0" initializer. 5676bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5677 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5678 Method->setPure(); 5679 5680 // A class is abstract if at least one function is pure virtual. 5681 Method->getParent()->setAbstract(true); 5682 return false; 5683 } 5684 5685 if (!Method->isInvalidDecl()) 5686 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5687 << Method->getDeclName() << InitRange; 5688 return true; 5689} 5690 5691/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5692/// an initializer for the out-of-line declaration 'Dcl'. The scope 5693/// is a fresh scope pushed for just this purpose. 5694/// 5695/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5696/// static data member of class X, names should be looked up in the scope of 5697/// class X. 5698void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5699 // If there is no declaration, there was an error parsing it. 5700 Decl *D = Dcl.getAs<Decl>(); 5701 if (D == 0) return; 5702 5703 // We should only get called for declarations with scope specifiers, like: 5704 // int foo::bar; 5705 assert(D->isOutOfLine()); 5706 EnterDeclaratorContext(S, D->getDeclContext()); 5707} 5708 5709/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5710/// initializer for the out-of-line declaration 'Dcl'. 5711void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5712 // If there is no declaration, there was an error parsing it. 5713 Decl *D = Dcl.getAs<Decl>(); 5714 if (D == 0) return; 5715 5716 assert(D->isOutOfLine()); 5717 ExitDeclaratorContext(S); 5718} 5719 5720/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5721/// C++ if/switch/while/for statement. 5722/// e.g: "if (int x = f()) {...}" 5723Action::DeclResult 5724Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5725 // C++ 6.4p2: 5726 // The declarator shall not specify a function or an array. 5727 // The type-specifier-seq shall not contain typedef and shall not declare a 5728 // new class or enumeration. 5729 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5730 "Parser allowed 'typedef' as storage class of condition decl."); 5731 5732 TypeSourceInfo *TInfo = 0; 5733 TagDecl *OwnedTag = 0; 5734 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5735 5736 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5737 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5738 // would be created and CXXConditionDeclExpr wants a VarDecl. 5739 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5740 << D.getSourceRange(); 5741 return DeclResult(); 5742 } else if (OwnedTag && OwnedTag->isDefinition()) { 5743 // The type-specifier-seq shall not declare a new class or enumeration. 5744 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5745 } 5746 5747 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5748 if (!Dcl) 5749 return DeclResult(); 5750 5751 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5752 VD->setDeclaredInCondition(true); 5753 return Dcl; 5754} 5755 5756void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5757 CXXMethodDecl *MD) { 5758 // Ignore dependent types. 5759 if (MD->isDependentContext()) 5760 return; 5761 5762 CXXRecordDecl *RD = MD->getParent(); 5763 5764 // Ignore classes without a vtable. 5765 if (!RD->isDynamicClass()) 5766 return; 5767 5768 // Ignore declarations that are not definitions. 5769 if (!MD->isThisDeclarationADefinition()) 5770 return; 5771 5772 if (isa<CXXConstructorDecl>(MD)) { 5773 switch (MD->getParent()->getTemplateSpecializationKind()) { 5774 case TSK_Undeclared: 5775 case TSK_ExplicitSpecialization: 5776 // Classes that aren't instantiations of templates don't need their 5777 // virtual methods marked until we see the definition of the key 5778 // function. 5779 return; 5780 5781 case TSK_ImplicitInstantiation: 5782 case TSK_ExplicitInstantiationDeclaration: 5783 case TSK_ExplicitInstantiationDefinition: 5784 // This is a constructor of a class template; mark all of the virtual 5785 // members as referenced to ensure that they get instantiatied. 5786 break; 5787 } 5788 } else if (!MD->isOutOfLine()) { 5789 // Consider only out-of-line definitions of member functions. When we see 5790 // an inline definition, it's too early to compute the key function. 5791 return; 5792 } else if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD)) { 5793 // If this is not the key function, we don't need to mark virtual members. 5794 if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) 5795 return; 5796 } else { 5797 // The class has no key function, so we've already noted that we need to 5798 // mark the virtual members of this class. 5799 return; 5800 } 5801 5802 // We will need to mark all of the virtual members as referenced to build the 5803 // vtable. 5804 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5805} 5806 5807bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5808 if (ClassesWithUnmarkedVirtualMembers.empty()) 5809 return false; 5810 5811 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5812 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5813 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5814 ClassesWithUnmarkedVirtualMembers.pop_back(); 5815 MarkVirtualMembersReferenced(Loc, RD); 5816 } 5817 5818 return true; 5819} 5820 5821void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5822 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5823 e = RD->method_end(); i != e; ++i) { 5824 CXXMethodDecl *MD = *i; 5825 5826 // C++ [basic.def.odr]p2: 5827 // [...] A virtual member function is used if it is not pure. [...] 5828 if (MD->isVirtual() && !MD->isPure()) 5829 MarkDeclarationReferenced(Loc, MD); 5830 } 5831} 5832 5833