SemaDeclCXX.cpp revision 16d41ca8932b22d587c10391a223844215cd6bfa
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 "Lookup.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/RecordLayout.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/TypeLoc.h" 22#include "clang/AST/TypeOrdering.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Template.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Lex/Preprocessor.h" 28#include "llvm/ADT/STLExtras.h" 29#include <map> 30#include <set> 31 32using namespace clang; 33 34//===----------------------------------------------------------------------===// 35// CheckDefaultArgumentVisitor 36//===----------------------------------------------------------------------===// 37 38namespace { 39 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 40 /// the default argument of a parameter to determine whether it 41 /// contains any ill-formed subexpressions. For example, this will 42 /// diagnose the use of local variables or parameters within the 43 /// default argument expression. 44 class CheckDefaultArgumentVisitor 45 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 46 Expr *DefaultArg; 47 Sema *S; 48 49 public: 50 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 51 : DefaultArg(defarg), S(s) {} 52 53 bool VisitExpr(Expr *Node); 54 bool VisitDeclRefExpr(DeclRefExpr *DRE); 55 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 56 }; 57 58 /// VisitExpr - Visit all of the children of this expression. 59 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 60 bool IsInvalid = false; 61 for (Stmt::child_iterator I = Node->child_begin(), 62 E = Node->child_end(); I != E; ++I) 63 IsInvalid |= Visit(*I); 64 return IsInvalid; 65 } 66 67 /// VisitDeclRefExpr - Visit a reference to a declaration, to 68 /// determine whether this declaration can be used in the default 69 /// argument expression. 70 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 71 NamedDecl *Decl = DRE->getDecl(); 72 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 73 // C++ [dcl.fct.default]p9 74 // Default arguments are evaluated each time the function is 75 // called. The order of evaluation of function arguments is 76 // unspecified. Consequently, parameters of a function shall not 77 // be used in default argument expressions, even if they are not 78 // evaluated. Parameters of a function declared before a default 79 // argument expression are in scope and can hide namespace and 80 // class member names. 81 return S->Diag(DRE->getSourceRange().getBegin(), 82 diag::err_param_default_argument_references_param) 83 << Param->getDeclName() << DefaultArg->getSourceRange(); 84 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p7 86 // Local variables shall not be used in default argument 87 // expressions. 88 if (VDecl->isBlockVarDecl()) 89 return S->Diag(DRE->getSourceRange().getBegin(), 90 diag::err_param_default_argument_references_local) 91 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 92 } 93 94 return false; 95 } 96 97 /// VisitCXXThisExpr - Visit a C++ "this" expression. 98 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 99 // C++ [dcl.fct.default]p8: 100 // The keyword this shall not be used in a default argument of a 101 // member function. 102 return S->Diag(ThisE->getSourceRange().getBegin(), 103 diag::err_param_default_argument_references_this) 104 << ThisE->getSourceRange(); 105 } 106} 107 108bool 109Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 110 SourceLocation EqualLoc) { 111 QualType ParamType = Param->getType(); 112 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 128 Param->getDeclName(), /*DirectInit=*/false)) 129 return true; 130 131 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 132 133 // Okay: add the default argument to the parameter 134 Param->setDefaultArg(Arg); 135 136 DefaultArg.release(); 137 138 return false; 139} 140 141/// ActOnParamDefaultArgument - Check whether the default argument 142/// provided for a function parameter is well-formed. If so, attach it 143/// to the parameter declaration. 144void 145Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 146 ExprArg defarg) { 147 if (!param || !defarg.get()) 148 return; 149 150 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 151 UnparsedDefaultArgLocs.erase(Param); 152 153 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 154 QualType ParamType = Param->getType(); 155 156 // Default arguments are only permitted in C++ 157 if (!getLangOptions().CPlusPlus) { 158 Diag(EqualLoc, diag::err_param_default_argument) 159 << DefaultArg->getSourceRange(); 160 Param->setInvalidDecl(); 161 return; 162 } 163 164 // Check that the default argument is well-formed 165 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 166 if (DefaultArgChecker.Visit(DefaultArg.get())) { 167 Param->setInvalidDecl(); 168 return; 169 } 170 171 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 172} 173 174/// ActOnParamUnparsedDefaultArgument - We've seen a default 175/// argument for a function parameter, but we can't parse it yet 176/// because we're inside a class definition. Note that this default 177/// argument will be parsed later. 178void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 179 SourceLocation EqualLoc, 180 SourceLocation ArgLoc) { 181 if (!param) 182 return; 183 184 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 185 if (Param) 186 Param->setUnparsedDefaultArg(); 187 188 UnparsedDefaultArgLocs[Param] = ArgLoc; 189} 190 191/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 192/// the default argument for the parameter param failed. 193void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 194 if (!param) 195 return; 196 197 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 198 199 Param->setInvalidDecl(); 200 201 UnparsedDefaultArgLocs.erase(Param); 202} 203 204/// CheckExtraCXXDefaultArguments - Check for any extra default 205/// arguments in the declarator, which is not a function declaration 206/// or definition and therefore is not permitted to have default 207/// arguments. This routine should be invoked for every declarator 208/// that is not a function declaration or definition. 209void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 210 // C++ [dcl.fct.default]p3 211 // A default argument expression shall be specified only in the 212 // parameter-declaration-clause of a function declaration or in a 213 // template-parameter (14.1). It shall not be specified for a 214 // parameter pack. If it is specified in a 215 // parameter-declaration-clause, it shall not occur within a 216 // declarator or abstract-declarator of a parameter-declaration. 217 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 218 DeclaratorChunk &chunk = D.getTypeObject(i); 219 if (chunk.Kind == DeclaratorChunk::Function) { 220 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 221 ParmVarDecl *Param = 222 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 223 if (Param->hasUnparsedDefaultArg()) { 224 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 225 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 226 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 227 delete Toks; 228 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 229 } else if (Param->getDefaultArg()) { 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << Param->getDefaultArg()->getSourceRange(); 232 Param->setDefaultArg(0); 233 } 234 } 235 } 236 } 237} 238 239// MergeCXXFunctionDecl - Merge two declarations of the same C++ 240// function, once we already know that they have the same 241// type. Subroutine of MergeFunctionDecl. Returns true if there was an 242// error, false otherwise. 243bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 244 bool Invalid = false; 245 246 // C++ [dcl.fct.default]p4: 247 // For non-template functions, default arguments can be added in 248 // later declarations of a function in the same 249 // scope. Declarations in different scopes have completely 250 // distinct sets of default arguments. That is, declarations in 251 // inner scopes do not acquire default arguments from 252 // declarations in outer scopes, and vice versa. In a given 253 // function declaration, all parameters subsequent to a 254 // parameter with a default argument shall have default 255 // arguments supplied in this or previous declarations. A 256 // default argument shall not be redefined by a later 257 // declaration (not even to the same value). 258 // 259 // C++ [dcl.fct.default]p6: 260 // Except for member functions of class templates, the default arguments 261 // in a member function definition that appears outside of the class 262 // definition are added to the set of default arguments provided by the 263 // member function declaration in the class definition. 264 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 265 ParmVarDecl *OldParam = Old->getParamDecl(p); 266 ParmVarDecl *NewParam = New->getParamDecl(p); 267 268 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 269 // FIXME: If the parameter doesn't have an identifier then the location 270 // points to the '=' which means that the fixit hint won't remove any 271 // extra spaces between the type and the '='. 272 SourceLocation Begin = NewParam->getLocation(); 273 if (NewParam->getIdentifier()) 274 Begin = PP.getLocForEndOfToken(Begin); 275 276 Diag(NewParam->getLocation(), 277 diag::err_param_default_argument_redefinition) 278 << NewParam->getDefaultArgRange() 279 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 280 NewParam->getLocEnd())); 281 282 // Look for the function declaration where the default argument was 283 // actually written, which may be a declaration prior to Old. 284 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 285 Older; Older = Older->getPreviousDeclaration()) { 286 if (!Older->getParamDecl(p)->hasDefaultArg()) 287 break; 288 289 OldParam = Older->getParamDecl(p); 290 } 291 292 Diag(OldParam->getLocation(), diag::note_previous_definition) 293 << OldParam->getDefaultArgRange(); 294 Invalid = true; 295 } else if (OldParam->hasDefaultArg()) { 296 // Merge the old default argument into the new parameter 297 if (OldParam->hasUninstantiatedDefaultArg()) 298 NewParam->setUninstantiatedDefaultArg( 299 OldParam->getUninstantiatedDefaultArg()); 300 else 301 NewParam->setDefaultArg(OldParam->getDefaultArg()); 302 } else if (NewParam->hasDefaultArg()) { 303 if (New->getDescribedFunctionTemplate()) { 304 // Paragraph 4, quoted above, only applies to non-template functions. 305 Diag(NewParam->getLocation(), 306 diag::err_param_default_argument_template_redecl) 307 << NewParam->getDefaultArgRange(); 308 Diag(Old->getLocation(), diag::note_template_prev_declaration) 309 << false; 310 } else if (New->getTemplateSpecializationKind() 311 != TSK_ImplicitInstantiation && 312 New->getTemplateSpecializationKind() != TSK_Undeclared) { 313 // C++ [temp.expr.spec]p21: 314 // Default function arguments shall not be specified in a declaration 315 // or a definition for one of the following explicit specializations: 316 // - the explicit specialization of a function template; 317 // - the explicit specialization of a member function template; 318 // - the explicit specialization of a member function of a class 319 // template where the class template specialization to which the 320 // member function specialization belongs is implicitly 321 // instantiated. 322 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 323 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 324 << New->getDeclName() 325 << NewParam->getDefaultArgRange(); 326 } else if (New->getDeclContext()->isDependentContext()) { 327 // C++ [dcl.fct.default]p6 (DR217): 328 // Default arguments for a member function of a class template shall 329 // be specified on the initial declaration of the member function 330 // within the class template. 331 // 332 // Reading the tea leaves a bit in DR217 and its reference to DR205 333 // leads me to the conclusion that one cannot add default function 334 // arguments for an out-of-line definition of a member function of a 335 // dependent type. 336 int WhichKind = 2; 337 if (CXXRecordDecl *Record 338 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 339 if (Record->getDescribedClassTemplate()) 340 WhichKind = 0; 341 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 342 WhichKind = 1; 343 else 344 WhichKind = 2; 345 } 346 347 Diag(NewParam->getLocation(), 348 diag::err_param_default_argument_member_template_redecl) 349 << WhichKind 350 << NewParam->getDefaultArgRange(); 351 } 352 } 353 } 354 355 if (CheckEquivalentExceptionSpec( 356 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 357 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 358 Invalid = true; 359 360 return Invalid; 361} 362 363/// CheckCXXDefaultArguments - Verify that the default arguments for a 364/// function declaration are well-formed according to C++ 365/// [dcl.fct.default]. 366void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 367 unsigned NumParams = FD->getNumParams(); 368 unsigned p; 369 370 // Find first parameter with a default argument 371 for (p = 0; p < NumParams; ++p) { 372 ParmVarDecl *Param = FD->getParamDecl(p); 373 if (Param->hasDefaultArg()) 374 break; 375 } 376 377 // C++ [dcl.fct.default]p4: 378 // In a given function declaration, all parameters 379 // subsequent to a parameter with a default argument shall 380 // have default arguments supplied in this or previous 381 // declarations. A default argument shall not be redefined 382 // by a later declaration (not even to the same value). 383 unsigned LastMissingDefaultArg = 0; 384 for (; p < NumParams; ++p) { 385 ParmVarDecl *Param = FD->getParamDecl(p); 386 if (!Param->hasDefaultArg()) { 387 if (Param->isInvalidDecl()) 388 /* We already complained about this parameter. */; 389 else if (Param->getIdentifier()) 390 Diag(Param->getLocation(), 391 diag::err_param_default_argument_missing_name) 392 << Param->getIdentifier(); 393 else 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing); 396 397 LastMissingDefaultArg = p; 398 } 399 } 400 401 if (LastMissingDefaultArg > 0) { 402 // Some default arguments were missing. Clear out all of the 403 // default arguments up to (and including) the last missing 404 // default argument, so that we leave the function parameters 405 // in a semantically valid state. 406 for (p = 0; p <= LastMissingDefaultArg; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (Param->hasDefaultArg()) { 409 if (!Param->hasUnparsedDefaultArg()) 410 Param->getDefaultArg()->Destroy(Context); 411 Param->setDefaultArg(0); 412 } 413 } 414 } 415} 416 417/// isCurrentClassName - Determine whether the identifier II is the 418/// name of the class type currently being defined. In the case of 419/// nested classes, this will only return true if II is the name of 420/// the innermost class. 421bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 422 const CXXScopeSpec *SS) { 423 CXXRecordDecl *CurDecl; 424 if (SS && SS->isSet() && !SS->isInvalid()) { 425 DeclContext *DC = computeDeclContext(*SS, true); 426 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 427 } else 428 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 429 430 if (CurDecl) 431 return &II == CurDecl->getIdentifier(); 432 else 433 return false; 434} 435 436/// \brief Check the validity of a C++ base class specifier. 437/// 438/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 439/// and returns NULL otherwise. 440CXXBaseSpecifier * 441Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 442 SourceRange SpecifierRange, 443 bool Virtual, AccessSpecifier Access, 444 QualType BaseType, 445 SourceLocation BaseLoc) { 446 // C++ [class.union]p1: 447 // A union shall not have base classes. 448 if (Class->isUnion()) { 449 Diag(Class->getLocation(), diag::err_base_clause_on_union) 450 << SpecifierRange; 451 return 0; 452 } 453 454 if (BaseType->isDependentType()) 455 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 456 Class->getTagKind() == RecordDecl::TK_class, 457 Access, BaseType); 458 459 // Base specifiers must be record types. 460 if (!BaseType->isRecordType()) { 461 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 462 return 0; 463 } 464 465 // C++ [class.union]p1: 466 // A union shall not be used as a base class. 467 if (BaseType->isUnionType()) { 468 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.derived]p2: 473 // The class-name in a base-specifier shall not be an incompletely 474 // defined class. 475 if (RequireCompleteType(BaseLoc, BaseType, 476 PDiag(diag::err_incomplete_base_class) 477 << SpecifierRange)) 478 return 0; 479 480 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 481 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 482 assert(BaseDecl && "Record type has no declaration"); 483 BaseDecl = BaseDecl->getDefinition(Context); 484 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 485 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 486 assert(CXXBaseDecl && "Base type is not a C++ type"); 487 if (!CXXBaseDecl->isEmpty()) 488 Class->setEmpty(false); 489 if (CXXBaseDecl->isPolymorphic()) 490 Class->setPolymorphic(true); 491 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 492 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 493 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 494 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 495 << BaseType; 496 return 0; 497 } 498 499 SetClassDeclAttributesFromBase(Class, cast<CXXRecordDecl>(BaseDecl), Virtual); 500 501 // Create the base specifier. 502 // FIXME: Allocate via ASTContext? 503 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 504 Class->getTagKind() == RecordDecl::TK_class, 505 Access, BaseType); 506} 507 508void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 509 const CXXRecordDecl *BaseClass, 510 bool BaseIsVirtual) { 511 512 // C++ [dcl.init.aggr]p1: 513 // An aggregate is [...] a class with [...] no base classes [...]. 514 Class->setAggregate(false); 515 Class->setPOD(false); 516 517 if (BaseIsVirtual) { 518 // C++ [class.ctor]p5: 519 // A constructor is trivial if its class has no virtual base classes. 520 Class->setHasTrivialConstructor(false); 521 522 // C++ [class.copy]p6: 523 // A copy constructor is trivial if its class has no virtual base classes. 524 Class->setHasTrivialCopyConstructor(false); 525 526 // C++ [class.copy]p11: 527 // A copy assignment operator is trivial if its class has no virtual 528 // base classes. 529 Class->setHasTrivialCopyAssignment(false); 530 531 // C++0x [meta.unary.prop] is_empty: 532 // T is a class type, but not a union type, with ... no virtual base 533 // classes 534 Class->setEmpty(false); 535 } else { 536 // C++ [class.ctor]p5: 537 // A constructor is trivial if all the direct base classes of its 538 // class have trivial constructors. 539 if (!BaseClass->hasTrivialConstructor()) 540 Class->setHasTrivialConstructor(false); 541 542 // C++ [class.copy]p6: 543 // A copy constructor is trivial if all the direct base classes of its 544 // class have trivial copy constructors. 545 if (!BaseClass->hasTrivialCopyConstructor()) 546 Class->setHasTrivialCopyConstructor(false); 547 548 // C++ [class.copy]p11: 549 // A copy assignment operator is trivial if all the direct base classes 550 // of its class have trivial copy assignment operators. 551 if (!BaseClass->hasTrivialCopyAssignment()) 552 Class->setHasTrivialCopyAssignment(false); 553 } 554 555 // C++ [class.ctor]p3: 556 // A destructor is trivial if all the direct base classes of its class 557 // have trivial destructors. 558 if (!BaseClass->hasTrivialDestructor()) 559 Class->setHasTrivialDestructor(false); 560} 561 562/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 563/// one entry in the base class list of a class specifier, for 564/// example: 565/// class foo : public bar, virtual private baz { 566/// 'public bar' and 'virtual private baz' are each base-specifiers. 567Sema::BaseResult 568Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 569 bool Virtual, AccessSpecifier Access, 570 TypeTy *basetype, SourceLocation BaseLoc) { 571 if (!classdecl) 572 return true; 573 574 AdjustDeclIfTemplate(classdecl); 575 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 576 QualType BaseType = GetTypeFromParser(basetype); 577 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 578 Virtual, Access, 579 BaseType, BaseLoc)) 580 return BaseSpec; 581 582 return true; 583} 584 585/// \brief Performs the actual work of attaching the given base class 586/// specifiers to a C++ class. 587bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 588 unsigned NumBases) { 589 if (NumBases == 0) 590 return false; 591 592 // Used to keep track of which base types we have already seen, so 593 // that we can properly diagnose redundant direct base types. Note 594 // that the key is always the unqualified canonical type of the base 595 // class. 596 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 597 598 // Copy non-redundant base specifiers into permanent storage. 599 unsigned NumGoodBases = 0; 600 bool Invalid = false; 601 for (unsigned idx = 0; idx < NumBases; ++idx) { 602 QualType NewBaseType 603 = Context.getCanonicalType(Bases[idx]->getType()); 604 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Context, Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651/// \brief Determine whether the type \p Derived is a C++ class that is 652/// derived from the type \p Base. 653bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 654 if (!getLangOptions().CPlusPlus) 655 return false; 656 657 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 658 if (!DerivedRT) 659 return false; 660 661 const RecordType *BaseRT = Base->getAs<RecordType>(); 662 if (!BaseRT) 663 return false; 664 665 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 666 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 667 return DerivedRD->isDerivedFrom(BaseRD); 668} 669 670/// \brief Determine whether the type \p Derived is a C++ class that is 671/// derived from the type \p Base. 672bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 673 if (!getLangOptions().CPlusPlus) 674 return false; 675 676 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 677 if (!DerivedRT) 678 return false; 679 680 const RecordType *BaseRT = Base->getAs<RecordType>(); 681 if (!BaseRT) 682 return false; 683 684 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 685 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 686 return DerivedRD->isDerivedFrom(BaseRD, Paths); 687} 688 689/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 690/// conversion (where Derived and Base are class types) is 691/// well-formed, meaning that the conversion is unambiguous (and 692/// that all of the base classes are accessible). Returns true 693/// and emits a diagnostic if the code is ill-formed, returns false 694/// otherwise. Loc is the location where this routine should point to 695/// if there is an error, and Range is the source range to highlight 696/// if there is an error. 697bool 698Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 699 unsigned InaccessibleBaseID, 700 unsigned AmbigiousBaseConvID, 701 SourceLocation Loc, SourceRange Range, 702 DeclarationName Name) { 703 // First, determine whether the path from Derived to Base is 704 // ambiguous. This is slightly more expensive than checking whether 705 // the Derived to Base conversion exists, because here we need to 706 // explore multiple paths to determine if there is an ambiguity. 707 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 708 /*DetectVirtual=*/false); 709 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 710 assert(DerivationOkay && 711 "Can only be used with a derived-to-base conversion"); 712 (void)DerivationOkay; 713 714 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 715 if (InaccessibleBaseID == 0) 716 return false; 717 // Check that the base class can be accessed. 718 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 719 Name); 720 } 721 722 // We know that the derived-to-base conversion is ambiguous, and 723 // we're going to produce a diagnostic. Perform the derived-to-base 724 // search just one more time to compute all of the possible paths so 725 // that we can print them out. This is more expensive than any of 726 // the previous derived-to-base checks we've done, but at this point 727 // performance isn't as much of an issue. 728 Paths.clear(); 729 Paths.setRecordingPaths(true); 730 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 731 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 732 (void)StillOkay; 733 734 // Build up a textual representation of the ambiguous paths, e.g., 735 // D -> B -> A, that will be used to illustrate the ambiguous 736 // conversions in the diagnostic. We only print one of the paths 737 // to each base class subobject. 738 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 739 740 Diag(Loc, AmbigiousBaseConvID) 741 << Derived << Base << PathDisplayStr << Range << Name; 742 return true; 743} 744 745bool 746Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 747 SourceLocation Loc, SourceRange Range, 748 bool IgnoreAccess) { 749 return CheckDerivedToBaseConversion(Derived, Base, 750 IgnoreAccess ? 0 : 751 diag::err_conv_to_inaccessible_base, 752 diag::err_ambiguous_derived_to_base_conv, 753 Loc, Range, DeclarationName()); 754} 755 756 757/// @brief Builds a string representing ambiguous paths from a 758/// specific derived class to different subobjects of the same base 759/// class. 760/// 761/// This function builds a string that can be used in error messages 762/// to show the different paths that one can take through the 763/// inheritance hierarchy to go from the derived class to different 764/// subobjects of a base class. The result looks something like this: 765/// @code 766/// struct D -> struct B -> struct A 767/// struct D -> struct C -> struct A 768/// @endcode 769std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 770 std::string PathDisplayStr; 771 std::set<unsigned> DisplayedPaths; 772 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 773 Path != Paths.end(); ++Path) { 774 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 775 // We haven't displayed a path to this particular base 776 // class subobject yet. 777 PathDisplayStr += "\n "; 778 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 779 for (CXXBasePath::const_iterator Element = Path->begin(); 780 Element != Path->end(); ++Element) 781 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 782 } 783 } 784 785 return PathDisplayStr; 786} 787 788//===----------------------------------------------------------------------===// 789// C++ class member Handling 790//===----------------------------------------------------------------------===// 791 792/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 793/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 794/// bitfield width if there is one and 'InitExpr' specifies the initializer if 795/// any. 796Sema::DeclPtrTy 797Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 798 MultiTemplateParamsArg TemplateParameterLists, 799 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 800 bool Deleted) { 801 const DeclSpec &DS = D.getDeclSpec(); 802 DeclarationName Name = GetNameForDeclarator(D); 803 Expr *BitWidth = static_cast<Expr*>(BW); 804 Expr *Init = static_cast<Expr*>(InitExpr); 805 SourceLocation Loc = D.getIdentifierLoc(); 806 807 bool isFunc = D.isFunctionDeclarator(); 808 809 assert(!DS.isFriendSpecified()); 810 811 // C++ 9.2p6: A member shall not be declared to have automatic storage 812 // duration (auto, register) or with the extern storage-class-specifier. 813 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 814 // data members and cannot be applied to names declared const or static, 815 // and cannot be applied to reference members. 816 switch (DS.getStorageClassSpec()) { 817 case DeclSpec::SCS_unspecified: 818 case DeclSpec::SCS_typedef: 819 case DeclSpec::SCS_static: 820 // FALL THROUGH. 821 break; 822 case DeclSpec::SCS_mutable: 823 if (isFunc) { 824 if (DS.getStorageClassSpecLoc().isValid()) 825 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 826 else 827 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 828 829 // FIXME: It would be nicer if the keyword was ignored only for this 830 // declarator. Otherwise we could get follow-up errors. 831 D.getMutableDeclSpec().ClearStorageClassSpecs(); 832 } else { 833 QualType T = GetTypeForDeclarator(D, S); 834 diag::kind err = static_cast<diag::kind>(0); 835 if (T->isReferenceType()) 836 err = diag::err_mutable_reference; 837 else if (T.isConstQualified()) 838 err = diag::err_mutable_const; 839 if (err != 0) { 840 if (DS.getStorageClassSpecLoc().isValid()) 841 Diag(DS.getStorageClassSpecLoc(), err); 842 else 843 Diag(DS.getThreadSpecLoc(), err); 844 // FIXME: It would be nicer if the keyword was ignored only for this 845 // declarator. Otherwise we could get follow-up errors. 846 D.getMutableDeclSpec().ClearStorageClassSpecs(); 847 } 848 } 849 break; 850 default: 851 if (DS.getStorageClassSpecLoc().isValid()) 852 Diag(DS.getStorageClassSpecLoc(), 853 diag::err_storageclass_invalid_for_member); 854 else 855 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 856 D.getMutableDeclSpec().ClearStorageClassSpecs(); 857 } 858 859 if (!isFunc && 860 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 861 D.getNumTypeObjects() == 0) { 862 // Check also for this case: 863 // 864 // typedef int f(); 865 // f a; 866 // 867 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 868 isFunc = TDType->isFunctionType(); 869 } 870 871 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 872 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 873 !isFunc); 874 875 Decl *Member; 876 if (isInstField) { 877 // FIXME: Check for template parameters! 878 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 879 AS); 880 assert(Member && "HandleField never returns null"); 881 } else { 882 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 883 .getAs<Decl>(); 884 if (!Member) { 885 if (BitWidth) DeleteExpr(BitWidth); 886 return DeclPtrTy(); 887 } 888 889 // Non-instance-fields can't have a bitfield. 890 if (BitWidth) { 891 if (Member->isInvalidDecl()) { 892 // don't emit another diagnostic. 893 } else if (isa<VarDecl>(Member)) { 894 // C++ 9.6p3: A bit-field shall not be a static member. 895 // "static member 'A' cannot be a bit-field" 896 Diag(Loc, diag::err_static_not_bitfield) 897 << Name << BitWidth->getSourceRange(); 898 } else if (isa<TypedefDecl>(Member)) { 899 // "typedef member 'x' cannot be a bit-field" 900 Diag(Loc, diag::err_typedef_not_bitfield) 901 << Name << BitWidth->getSourceRange(); 902 } else { 903 // A function typedef ("typedef int f(); f a;"). 904 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 905 Diag(Loc, diag::err_not_integral_type_bitfield) 906 << Name << cast<ValueDecl>(Member)->getType() 907 << BitWidth->getSourceRange(); 908 } 909 910 DeleteExpr(BitWidth); 911 BitWidth = 0; 912 Member->setInvalidDecl(); 913 } 914 915 Member->setAccess(AS); 916 917 // If we have declared a member function template, set the access of the 918 // templated declaration as well. 919 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 920 FunTmpl->getTemplatedDecl()->setAccess(AS); 921 } 922 923 assert((Name || isInstField) && "No identifier for non-field ?"); 924 925 if (Init) 926 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 927 if (Deleted) // FIXME: Source location is not very good. 928 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 929 930 if (isInstField) { 931 FieldCollector->Add(cast<FieldDecl>(Member)); 932 return DeclPtrTy(); 933 } 934 return DeclPtrTy::make(Member); 935} 936 937/// ActOnMemInitializer - Handle a C++ member initializer. 938Sema::MemInitResult 939Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 940 Scope *S, 941 const CXXScopeSpec &SS, 942 IdentifierInfo *MemberOrBase, 943 TypeTy *TemplateTypeTy, 944 SourceLocation IdLoc, 945 SourceLocation LParenLoc, 946 ExprTy **Args, unsigned NumArgs, 947 SourceLocation *CommaLocs, 948 SourceLocation RParenLoc) { 949 if (!ConstructorD) 950 return true; 951 952 AdjustDeclIfTemplate(ConstructorD); 953 954 CXXConstructorDecl *Constructor 955 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 956 if (!Constructor) { 957 // The user wrote a constructor initializer on a function that is 958 // not a C++ constructor. Ignore the error for now, because we may 959 // have more member initializers coming; we'll diagnose it just 960 // once in ActOnMemInitializers. 961 return true; 962 } 963 964 CXXRecordDecl *ClassDecl = Constructor->getParent(); 965 966 // C++ [class.base.init]p2: 967 // Names in a mem-initializer-id are looked up in the scope of the 968 // constructor’s class and, if not found in that scope, are looked 969 // up in the scope containing the constructor’s 970 // definition. [Note: if the constructor’s class contains a member 971 // with the same name as a direct or virtual base class of the 972 // class, a mem-initializer-id naming the member or base class and 973 // composed of a single identifier refers to the class member. A 974 // mem-initializer-id for the hidden base class may be specified 975 // using a qualified name. ] 976 if (!SS.getScopeRep() && !TemplateTypeTy) { 977 // Look for a member, first. 978 FieldDecl *Member = 0; 979 DeclContext::lookup_result Result 980 = ClassDecl->lookup(MemberOrBase); 981 if (Result.first != Result.second) 982 Member = dyn_cast<FieldDecl>(*Result.first); 983 984 // FIXME: Handle members of an anonymous union. 985 986 if (Member) 987 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 988 LParenLoc, RParenLoc); 989 } 990 // It didn't name a member, so see if it names a class. 991 QualType BaseType; 992 993 DeclaratorInfo *DInfo = 0; 994 if (TemplateTypeTy) 995 BaseType = GetTypeFromParser(TemplateTypeTy, &DInfo); 996 else 997 BaseType = QualType::getFromOpaquePtr(getTypeName(*MemberOrBase, IdLoc, 998 S, &SS)); 999 if (BaseType.isNull()) 1000 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1001 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1002 1003 if (!DInfo) 1004 DInfo = Context.getTrivialDeclaratorInfo(BaseType, IdLoc); 1005 1006 return BuildBaseInitializer(BaseType, DInfo, (Expr **)Args, NumArgs, 1007 LParenLoc, RParenLoc, ClassDecl); 1008} 1009 1010/// Checks an initializer expression for use of uninitialized fields, such as 1011/// containing the field that is being initialized. Returns true if there is an 1012/// uninitialized field was used an updates the SourceLocation parameter; false 1013/// otherwise. 1014static bool InitExprContainsUninitializedFields(const Stmt* S, 1015 const FieldDecl* LhsField, 1016 SourceLocation* L) { 1017 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1018 if (ME) { 1019 const NamedDecl* RhsField = ME->getMemberDecl(); 1020 if (RhsField == LhsField) { 1021 // Initializing a field with itself. Throw a warning. 1022 // But wait; there are exceptions! 1023 // Exception #1: The field may not belong to this record. 1024 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1025 const Expr* base = ME->getBase(); 1026 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1027 // Even though the field matches, it does not belong to this record. 1028 return false; 1029 } 1030 // None of the exceptions triggered; return true to indicate an 1031 // uninitialized field was used. 1032 *L = ME->getMemberLoc(); 1033 return true; 1034 } 1035 } 1036 bool found = false; 1037 for (Stmt::const_child_iterator it = S->child_begin(); 1038 it != S->child_end() && found == false; 1039 ++it) { 1040 if (isa<CallExpr>(S)) { 1041 // Do not descend into function calls or constructors, as the use 1042 // of an uninitialized field may be valid. One would have to inspect 1043 // the contents of the function/ctor to determine if it is safe or not. 1044 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1045 // may be safe, depending on what the function/ctor does. 1046 continue; 1047 } 1048 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1049 } 1050 return found; 1051} 1052 1053Sema::MemInitResult 1054Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1055 unsigned NumArgs, SourceLocation IdLoc, 1056 SourceLocation LParenLoc, 1057 SourceLocation RParenLoc) { 1058 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1059 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1060 ExprTemporaries.clear(); 1061 1062 // Diagnose value-uses of fields to initialize themselves, e.g. 1063 // foo(foo) 1064 // where foo is not also a parameter to the constructor. 1065 // TODO: implement -Wuninitialized and fold this into that framework. 1066 for (unsigned i = 0; i < NumArgs; ++i) { 1067 SourceLocation L; 1068 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1069 // FIXME: Return true in the case when other fields are used before being 1070 // uninitialized. For example, let this field be the i'th field. When 1071 // initializing the i'th field, throw a warning if any of the >= i'th 1072 // fields are used, as they are not yet initialized. 1073 // Right now we are only handling the case where the i'th field uses 1074 // itself in its initializer. 1075 Diag(L, diag::warn_field_is_uninit); 1076 } 1077 } 1078 1079 bool HasDependentArg = false; 1080 for (unsigned i = 0; i < NumArgs; i++) 1081 HasDependentArg |= Args[i]->isTypeDependent(); 1082 1083 CXXConstructorDecl *C = 0; 1084 QualType FieldType = Member->getType(); 1085 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1086 FieldType = Array->getElementType(); 1087 if (FieldType->isDependentType()) { 1088 // Can't check init for dependent type. 1089 } else if (FieldType->isRecordType()) { 1090 // Member is a record (struct/union/class), so pass the initializer 1091 // arguments down to the record's constructor. 1092 if (!HasDependentArg) { 1093 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1094 1095 C = PerformInitializationByConstructor(FieldType, 1096 MultiExprArg(*this, 1097 (void**)Args, 1098 NumArgs), 1099 IdLoc, 1100 SourceRange(IdLoc, RParenLoc), 1101 Member->getDeclName(), IK_Direct, 1102 ConstructorArgs); 1103 1104 if (C) { 1105 // Take over the constructor arguments as our own. 1106 NumArgs = ConstructorArgs.size(); 1107 Args = (Expr **)ConstructorArgs.take(); 1108 } 1109 } 1110 } else if (NumArgs != 1 && NumArgs != 0) { 1111 // The member type is not a record type (or an array of record 1112 // types), so it can be only be default- or copy-initialized. 1113 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1114 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1115 } else if (!HasDependentArg) { 1116 Expr *NewExp; 1117 if (NumArgs == 0) { 1118 if (FieldType->isReferenceType()) { 1119 Diag(IdLoc, diag::err_null_intialized_reference_member) 1120 << Member->getDeclName(); 1121 return Diag(Member->getLocation(), diag::note_declared_at); 1122 } 1123 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1124 NumArgs = 1; 1125 } 1126 else 1127 NewExp = (Expr*)Args[0]; 1128 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1129 return true; 1130 Args[0] = NewExp; 1131 } 1132 1133 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1134 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1135 ExprTemporaries.clear(); 1136 1137 // FIXME: Perform direct initialization of the member. 1138 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1139 C, LParenLoc, (Expr **)Args, 1140 NumArgs, RParenLoc); 1141} 1142 1143Sema::MemInitResult 1144Sema::BuildBaseInitializer(QualType BaseType, DeclaratorInfo *BaseDInfo, 1145 Expr **Args, unsigned NumArgs, 1146 SourceLocation LParenLoc, SourceLocation RParenLoc, 1147 CXXRecordDecl *ClassDecl) { 1148 bool HasDependentArg = false; 1149 for (unsigned i = 0; i < NumArgs; i++) 1150 HasDependentArg |= Args[i]->isTypeDependent(); 1151 1152 SourceLocation BaseLoc = BaseDInfo->getTypeLoc().getSourceRange().getBegin(); 1153 if (!BaseType->isDependentType()) { 1154 if (!BaseType->isRecordType()) 1155 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1156 << BaseType << BaseDInfo->getTypeLoc().getSourceRange(); 1157 1158 // C++ [class.base.init]p2: 1159 // [...] Unless the mem-initializer-id names a nonstatic data 1160 // member of the constructor’s class or a direct or virtual base 1161 // of that class, the mem-initializer is ill-formed. A 1162 // mem-initializer-list can initialize a base class using any 1163 // name that denotes that base class type. 1164 1165 // First, check for a direct base class. 1166 const CXXBaseSpecifier *DirectBaseSpec = 0; 1167 for (CXXRecordDecl::base_class_const_iterator Base = 1168 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1169 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1170 // We found a direct base of this type. That's what we're 1171 // initializing. 1172 DirectBaseSpec = &*Base; 1173 break; 1174 } 1175 } 1176 1177 // Check for a virtual base class. 1178 // FIXME: We might be able to short-circuit this if we know in advance that 1179 // there are no virtual bases. 1180 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1181 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1182 // We haven't found a base yet; search the class hierarchy for a 1183 // virtual base class. 1184 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1185 /*DetectVirtual=*/false); 1186 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1187 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1188 Path != Paths.end(); ++Path) { 1189 if (Path->back().Base->isVirtual()) { 1190 VirtualBaseSpec = Path->back().Base; 1191 break; 1192 } 1193 } 1194 } 1195 } 1196 1197 // C++ [base.class.init]p2: 1198 // If a mem-initializer-id is ambiguous because it designates both 1199 // a direct non-virtual base class and an inherited virtual base 1200 // class, the mem-initializer is ill-formed. 1201 if (DirectBaseSpec && VirtualBaseSpec) 1202 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1203 << BaseType << BaseDInfo->getTypeLoc().getSourceRange(); 1204 // C++ [base.class.init]p2: 1205 // Unless the mem-initializer-id names a nonstatic data membeer of the 1206 // constructor's class ot a direst or virtual base of that class, the 1207 // mem-initializer is ill-formed. 1208 if (!DirectBaseSpec && !VirtualBaseSpec) 1209 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1210 << BaseType << ClassDecl->getNameAsCString() 1211 << BaseDInfo->getTypeLoc().getSourceRange(); 1212 } 1213 1214 CXXConstructorDecl *C = 0; 1215 if (!BaseType->isDependentType() && !HasDependentArg) { 1216 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1217 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1218 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1219 1220 C = PerformInitializationByConstructor(BaseType, 1221 MultiExprArg(*this, 1222 (void**)Args, NumArgs), 1223 BaseLoc, 1224 SourceRange(BaseLoc, RParenLoc), 1225 Name, IK_Direct, 1226 ConstructorArgs); 1227 if (C) { 1228 // Take over the constructor arguments as our own. 1229 NumArgs = ConstructorArgs.size(); 1230 Args = (Expr **)ConstructorArgs.take(); 1231 } 1232 } 1233 1234 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1235 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1236 ExprTemporaries.clear(); 1237 1238 return new (Context) CXXBaseOrMemberInitializer(Context, BaseDInfo, C, 1239 LParenLoc, (Expr **)Args, 1240 NumArgs, RParenLoc); 1241} 1242 1243bool 1244Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1245 CXXBaseOrMemberInitializer **Initializers, 1246 unsigned NumInitializers, 1247 bool IsImplicitConstructor) { 1248 // We need to build the initializer AST according to order of construction 1249 // and not what user specified in the Initializers list. 1250 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1251 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1252 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1253 bool HasDependentBaseInit = false; 1254 bool HadError = false; 1255 1256 for (unsigned i = 0; i < NumInitializers; i++) { 1257 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1258 if (Member->isBaseInitializer()) { 1259 if (Member->getBaseClass()->isDependentType()) 1260 HasDependentBaseInit = true; 1261 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1262 } else { 1263 AllBaseFields[Member->getMember()] = Member; 1264 } 1265 } 1266 1267 if (HasDependentBaseInit) { 1268 // FIXME. This does not preserve the ordering of the initializers. 1269 // Try (with -Wreorder) 1270 // template<class X> struct A {}; 1271 // template<class X> struct B : A<X> { 1272 // B() : x1(10), A<X>() {} 1273 // int x1; 1274 // }; 1275 // B<int> x; 1276 // On seeing one dependent type, we should essentially exit this routine 1277 // while preserving user-declared initializer list. When this routine is 1278 // called during instantiatiation process, this routine will rebuild the 1279 // ordered initializer list correctly. 1280 1281 // If we have a dependent base initialization, we can't determine the 1282 // association between initializers and bases; just dump the known 1283 // initializers into the list, and don't try to deal with other bases. 1284 for (unsigned i = 0; i < NumInitializers; i++) { 1285 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1286 if (Member->isBaseInitializer()) 1287 AllToInit.push_back(Member); 1288 } 1289 } else { 1290 // Push virtual bases before others. 1291 for (CXXRecordDecl::base_class_iterator VBase = 1292 ClassDecl->vbases_begin(), 1293 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1294 if (VBase->getType()->isDependentType()) 1295 continue; 1296 if (CXXBaseOrMemberInitializer *Value 1297 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1298 AllToInit.push_back(Value); 1299 } 1300 else { 1301 CXXRecordDecl *VBaseDecl = 1302 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1303 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1304 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1305 if (!Ctor) { 1306 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1307 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1308 << 0 << VBase->getType(); 1309 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1310 << Context.getTagDeclType(VBaseDecl); 1311 HadError = true; 1312 continue; 1313 } 1314 1315 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1316 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1317 Constructor->getLocation(), CtorArgs)) 1318 continue; 1319 1320 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1321 1322 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1323 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1324 // necessary. 1325 // FIXME: Is there any better source-location information we can give? 1326 ExprTemporaries.clear(); 1327 CXXBaseOrMemberInitializer *Member = 1328 new (Context) CXXBaseOrMemberInitializer(Context, 1329 Context.getTrivialDeclaratorInfo(VBase->getType(), 1330 SourceLocation()), 1331 Ctor, 1332 SourceLocation(), 1333 CtorArgs.takeAs<Expr>(), 1334 CtorArgs.size(), 1335 SourceLocation()); 1336 AllToInit.push_back(Member); 1337 } 1338 } 1339 1340 for (CXXRecordDecl::base_class_iterator Base = 1341 ClassDecl->bases_begin(), 1342 E = ClassDecl->bases_end(); Base != E; ++Base) { 1343 // Virtuals are in the virtual base list and already constructed. 1344 if (Base->isVirtual()) 1345 continue; 1346 // Skip dependent types. 1347 if (Base->getType()->isDependentType()) 1348 continue; 1349 if (CXXBaseOrMemberInitializer *Value 1350 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1351 AllToInit.push_back(Value); 1352 } 1353 else { 1354 CXXRecordDecl *BaseDecl = 1355 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1356 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1357 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1358 if (!Ctor) { 1359 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1360 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1361 << 0 << Base->getType(); 1362 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1363 << Context.getTagDeclType(BaseDecl); 1364 HadError = true; 1365 continue; 1366 } 1367 1368 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1369 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1370 Constructor->getLocation(), CtorArgs)) 1371 continue; 1372 1373 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1374 1375 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1376 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1377 // necessary. 1378 // FIXME: Is there any better source-location information we can give? 1379 ExprTemporaries.clear(); 1380 CXXBaseOrMemberInitializer *Member = 1381 new (Context) CXXBaseOrMemberInitializer(Context, 1382 Context.getTrivialDeclaratorInfo(Base->getType(), 1383 SourceLocation()), 1384 Ctor, 1385 SourceLocation(), 1386 CtorArgs.takeAs<Expr>(), 1387 CtorArgs.size(), 1388 SourceLocation()); 1389 AllToInit.push_back(Member); 1390 } 1391 } 1392 } 1393 1394 // non-static data members. 1395 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1396 E = ClassDecl->field_end(); Field != E; ++Field) { 1397 if ((*Field)->isAnonymousStructOrUnion()) { 1398 if (const RecordType *FieldClassType = 1399 Field->getType()->getAs<RecordType>()) { 1400 CXXRecordDecl *FieldClassDecl 1401 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1402 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1403 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1404 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1405 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1406 // set to the anonymous union data member used in the initializer 1407 // list. 1408 Value->setMember(*Field); 1409 Value->setAnonUnionMember(*FA); 1410 AllToInit.push_back(Value); 1411 break; 1412 } 1413 } 1414 } 1415 continue; 1416 } 1417 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1418 AllToInit.push_back(Value); 1419 continue; 1420 } 1421 1422 if ((*Field)->getType()->isDependentType()) 1423 continue; 1424 1425 QualType FT = Context.getBaseElementType((*Field)->getType()); 1426 if (const RecordType* RT = FT->getAs<RecordType>()) { 1427 CXXConstructorDecl *Ctor = 1428 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1429 if (!Ctor) { 1430 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1431 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1432 << 1 << (*Field)->getDeclName(); 1433 Diag(Field->getLocation(), diag::note_field_decl); 1434 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1435 << Context.getTagDeclType(RT->getDecl()); 1436 HadError = true; 1437 continue; 1438 } 1439 1440 if (FT.isConstQualified() && Ctor->isTrivial()) { 1441 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1442 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1443 << 1 << (*Field)->getDeclName(); 1444 Diag((*Field)->getLocation(), diag::note_declared_at); 1445 HadError = true; 1446 } 1447 1448 // Don't create initializers for trivial constructors, since they don't 1449 // actually need to be run. 1450 if (Ctor->isTrivial()) 1451 continue; 1452 1453 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1454 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1455 Constructor->getLocation(), CtorArgs)) 1456 continue; 1457 1458 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1459 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1460 ExprTemporaries.clear(); 1461 CXXBaseOrMemberInitializer *Member = 1462 new (Context) CXXBaseOrMemberInitializer(Context, 1463 *Field, SourceLocation(), 1464 Ctor, 1465 SourceLocation(), 1466 CtorArgs.takeAs<Expr>(), 1467 CtorArgs.size(), 1468 SourceLocation()); 1469 1470 AllToInit.push_back(Member); 1471 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1472 } 1473 else if (FT->isReferenceType()) { 1474 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1475 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1476 << 0 << (*Field)->getDeclName(); 1477 Diag((*Field)->getLocation(), diag::note_declared_at); 1478 HadError = true; 1479 } 1480 else if (FT.isConstQualified()) { 1481 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1482 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1483 << 1 << (*Field)->getDeclName(); 1484 Diag((*Field)->getLocation(), diag::note_declared_at); 1485 HadError = true; 1486 } 1487 } 1488 1489 NumInitializers = AllToInit.size(); 1490 if (NumInitializers > 0) { 1491 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1492 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1493 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1494 1495 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1496 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1497 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1498 } 1499 1500 return HadError; 1501} 1502 1503static void *GetKeyForTopLevelField(FieldDecl *Field) { 1504 // For anonymous unions, use the class declaration as the key. 1505 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1506 if (RT->getDecl()->isAnonymousStructOrUnion()) 1507 return static_cast<void *>(RT->getDecl()); 1508 } 1509 return static_cast<void *>(Field); 1510} 1511 1512static void *GetKeyForBase(QualType BaseType) { 1513 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1514 return (void *)RT; 1515 1516 assert(0 && "Unexpected base type!"); 1517 return 0; 1518} 1519 1520static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1521 bool MemberMaybeAnon = false) { 1522 // For fields injected into the class via declaration of an anonymous union, 1523 // use its anonymous union class declaration as the unique key. 1524 if (Member->isMemberInitializer()) { 1525 FieldDecl *Field = Member->getMember(); 1526 1527 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1528 // data member of the class. Data member used in the initializer list is 1529 // in AnonUnionMember field. 1530 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1531 Field = Member->getAnonUnionMember(); 1532 if (Field->getDeclContext()->isRecord()) { 1533 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1534 if (RD->isAnonymousStructOrUnion()) 1535 return static_cast<void *>(RD); 1536 } 1537 return static_cast<void *>(Field); 1538 } 1539 1540 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1541} 1542 1543/// ActOnMemInitializers - Handle the member initializers for a constructor. 1544void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1545 SourceLocation ColonLoc, 1546 MemInitTy **MemInits, unsigned NumMemInits) { 1547 if (!ConstructorDecl) 1548 return; 1549 1550 AdjustDeclIfTemplate(ConstructorDecl); 1551 1552 CXXConstructorDecl *Constructor 1553 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1554 1555 if (!Constructor) { 1556 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1557 return; 1558 } 1559 1560 if (!Constructor->isDependentContext()) { 1561 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1562 bool err = false; 1563 for (unsigned i = 0; i < NumMemInits; i++) { 1564 CXXBaseOrMemberInitializer *Member = 1565 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1566 void *KeyToMember = GetKeyForMember(Member); 1567 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1568 if (!PrevMember) { 1569 PrevMember = Member; 1570 continue; 1571 } 1572 if (FieldDecl *Field = Member->getMember()) 1573 Diag(Member->getSourceLocation(), 1574 diag::error_multiple_mem_initialization) 1575 << Field->getNameAsString() 1576 << Member->getSourceRange(); 1577 else { 1578 Type *BaseClass = Member->getBaseClass(); 1579 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1580 Diag(Member->getSourceLocation(), 1581 diag::error_multiple_base_initialization) 1582 << QualType(BaseClass, 0) 1583 << Member->getSourceRange(); 1584 } 1585 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1586 << 0; 1587 err = true; 1588 } 1589 1590 if (err) 1591 return; 1592 } 1593 1594 SetBaseOrMemberInitializers(Constructor, 1595 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1596 NumMemInits, false); 1597 1598 if (Constructor->isDependentContext()) 1599 return; 1600 1601 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1602 Diagnostic::Ignored && 1603 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1604 Diagnostic::Ignored) 1605 return; 1606 1607 // Also issue warning if order of ctor-initializer list does not match order 1608 // of 1) base class declarations and 2) order of non-static data members. 1609 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1610 1611 CXXRecordDecl *ClassDecl 1612 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1613 // Push virtual bases before others. 1614 for (CXXRecordDecl::base_class_iterator VBase = 1615 ClassDecl->vbases_begin(), 1616 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1617 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1618 1619 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1620 E = ClassDecl->bases_end(); Base != E; ++Base) { 1621 // Virtuals are alread in the virtual base list and are constructed 1622 // first. 1623 if (Base->isVirtual()) 1624 continue; 1625 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1626 } 1627 1628 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1629 E = ClassDecl->field_end(); Field != E; ++Field) 1630 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1631 1632 int Last = AllBaseOrMembers.size(); 1633 int curIndex = 0; 1634 CXXBaseOrMemberInitializer *PrevMember = 0; 1635 for (unsigned i = 0; i < NumMemInits; i++) { 1636 CXXBaseOrMemberInitializer *Member = 1637 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1638 void *MemberInCtorList = GetKeyForMember(Member, true); 1639 1640 for (; curIndex < Last; curIndex++) 1641 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1642 break; 1643 if (curIndex == Last) { 1644 assert(PrevMember && "Member not in member list?!"); 1645 // Initializer as specified in ctor-initializer list is out of order. 1646 // Issue a warning diagnostic. 1647 if (PrevMember->isBaseInitializer()) { 1648 // Diagnostics is for an initialized base class. 1649 Type *BaseClass = PrevMember->getBaseClass(); 1650 Diag(PrevMember->getSourceLocation(), 1651 diag::warn_base_initialized) 1652 << QualType(BaseClass, 0); 1653 } else { 1654 FieldDecl *Field = PrevMember->getMember(); 1655 Diag(PrevMember->getSourceLocation(), 1656 diag::warn_field_initialized) 1657 << Field->getNameAsString(); 1658 } 1659 // Also the note! 1660 if (FieldDecl *Field = Member->getMember()) 1661 Diag(Member->getSourceLocation(), 1662 diag::note_fieldorbase_initialized_here) << 0 1663 << Field->getNameAsString(); 1664 else { 1665 Type *BaseClass = Member->getBaseClass(); 1666 Diag(Member->getSourceLocation(), 1667 diag::note_fieldorbase_initialized_here) << 1 1668 << QualType(BaseClass, 0); 1669 } 1670 for (curIndex = 0; curIndex < Last; curIndex++) 1671 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1672 break; 1673 } 1674 PrevMember = Member; 1675 } 1676} 1677 1678void 1679Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1680 // Ignore dependent destructors. 1681 if (Destructor->isDependentContext()) 1682 return; 1683 1684 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1685 1686 // Non-static data members. 1687 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1688 E = ClassDecl->field_end(); I != E; ++I) { 1689 FieldDecl *Field = *I; 1690 1691 QualType FieldType = Context.getBaseElementType(Field->getType()); 1692 1693 const RecordType* RT = FieldType->getAs<RecordType>(); 1694 if (!RT) 1695 continue; 1696 1697 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1698 if (FieldClassDecl->hasTrivialDestructor()) 1699 continue; 1700 1701 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1702 MarkDeclarationReferenced(Destructor->getLocation(), 1703 const_cast<CXXDestructorDecl*>(Dtor)); 1704 } 1705 1706 // Bases. 1707 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1708 E = ClassDecl->bases_end(); Base != E; ++Base) { 1709 // Ignore virtual bases. 1710 if (Base->isVirtual()) 1711 continue; 1712 1713 // Ignore trivial destructors. 1714 CXXRecordDecl *BaseClassDecl 1715 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1716 if (BaseClassDecl->hasTrivialDestructor()) 1717 continue; 1718 1719 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1720 MarkDeclarationReferenced(Destructor->getLocation(), 1721 const_cast<CXXDestructorDecl*>(Dtor)); 1722 } 1723 1724 // Virtual bases. 1725 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1726 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1727 // Ignore trivial destructors. 1728 CXXRecordDecl *BaseClassDecl 1729 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1730 if (BaseClassDecl->hasTrivialDestructor()) 1731 continue; 1732 1733 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1734 MarkDeclarationReferenced(Destructor->getLocation(), 1735 const_cast<CXXDestructorDecl*>(Dtor)); 1736 } 1737} 1738 1739void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1740 if (!CDtorDecl) 1741 return; 1742 1743 AdjustDeclIfTemplate(CDtorDecl); 1744 1745 if (CXXConstructorDecl *Constructor 1746 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1747 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1748} 1749 1750namespace { 1751 /// PureVirtualMethodCollector - traverses a class and its superclasses 1752 /// and determines if it has any pure virtual methods. 1753 class PureVirtualMethodCollector { 1754 ASTContext &Context; 1755 1756 public: 1757 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1758 1759 private: 1760 MethodList Methods; 1761 1762 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1763 1764 public: 1765 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1766 : Context(Ctx) { 1767 1768 MethodList List; 1769 Collect(RD, List); 1770 1771 // Copy the temporary list to methods, and make sure to ignore any 1772 // null entries. 1773 for (size_t i = 0, e = List.size(); i != e; ++i) { 1774 if (List[i]) 1775 Methods.push_back(List[i]); 1776 } 1777 } 1778 1779 bool empty() const { return Methods.empty(); } 1780 1781 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1782 MethodList::const_iterator methods_end() { return Methods.end(); } 1783 }; 1784 1785 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1786 MethodList& Methods) { 1787 // First, collect the pure virtual methods for the base classes. 1788 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1789 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1790 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1791 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1792 if (BaseDecl && BaseDecl->isAbstract()) 1793 Collect(BaseDecl, Methods); 1794 } 1795 } 1796 1797 // Next, zero out any pure virtual methods that this class overrides. 1798 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1799 1800 MethodSetTy OverriddenMethods; 1801 size_t MethodsSize = Methods.size(); 1802 1803 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1804 i != e; ++i) { 1805 // Traverse the record, looking for methods. 1806 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1807 // If the method is pure virtual, add it to the methods vector. 1808 if (MD->isPure()) 1809 Methods.push_back(MD); 1810 1811 // Record all the overridden methods in our set. 1812 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1813 E = MD->end_overridden_methods(); I != E; ++I) { 1814 // Keep track of the overridden methods. 1815 OverriddenMethods.insert(*I); 1816 } 1817 } 1818 } 1819 1820 // Now go through the methods and zero out all the ones we know are 1821 // overridden. 1822 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1823 if (OverriddenMethods.count(Methods[i])) 1824 Methods[i] = 0; 1825 } 1826 1827 } 1828} 1829 1830 1831bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1832 unsigned DiagID, AbstractDiagSelID SelID, 1833 const CXXRecordDecl *CurrentRD) { 1834 if (SelID == -1) 1835 return RequireNonAbstractType(Loc, T, 1836 PDiag(DiagID), CurrentRD); 1837 else 1838 return RequireNonAbstractType(Loc, T, 1839 PDiag(DiagID) << SelID, CurrentRD); 1840} 1841 1842bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1843 const PartialDiagnostic &PD, 1844 const CXXRecordDecl *CurrentRD) { 1845 if (!getLangOptions().CPlusPlus) 1846 return false; 1847 1848 if (const ArrayType *AT = Context.getAsArrayType(T)) 1849 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1850 CurrentRD); 1851 1852 if (const PointerType *PT = T->getAs<PointerType>()) { 1853 // Find the innermost pointer type. 1854 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1855 PT = T; 1856 1857 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1858 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1859 } 1860 1861 const RecordType *RT = T->getAs<RecordType>(); 1862 if (!RT) 1863 return false; 1864 1865 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1866 if (!RD) 1867 return false; 1868 1869 if (CurrentRD && CurrentRD != RD) 1870 return false; 1871 1872 if (!RD->isAbstract()) 1873 return false; 1874 1875 Diag(Loc, PD) << RD->getDeclName(); 1876 1877 // Check if we've already emitted the list of pure virtual functions for this 1878 // class. 1879 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1880 return true; 1881 1882 PureVirtualMethodCollector Collector(Context, RD); 1883 1884 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1885 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1886 const CXXMethodDecl *MD = *I; 1887 1888 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1889 MD->getDeclName(); 1890 } 1891 1892 if (!PureVirtualClassDiagSet) 1893 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1894 PureVirtualClassDiagSet->insert(RD); 1895 1896 return true; 1897} 1898 1899namespace { 1900 class AbstractClassUsageDiagnoser 1901 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1902 Sema &SemaRef; 1903 CXXRecordDecl *AbstractClass; 1904 1905 bool VisitDeclContext(const DeclContext *DC) { 1906 bool Invalid = false; 1907 1908 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1909 E = DC->decls_end(); I != E; ++I) 1910 Invalid |= Visit(*I); 1911 1912 return Invalid; 1913 } 1914 1915 public: 1916 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1917 : SemaRef(SemaRef), AbstractClass(ac) { 1918 Visit(SemaRef.Context.getTranslationUnitDecl()); 1919 } 1920 1921 bool VisitFunctionDecl(const FunctionDecl *FD) { 1922 if (FD->isThisDeclarationADefinition()) { 1923 // No need to do the check if we're in a definition, because it requires 1924 // that the return/param types are complete. 1925 // because that requires 1926 return VisitDeclContext(FD); 1927 } 1928 1929 // Check the return type. 1930 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1931 bool Invalid = 1932 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1933 diag::err_abstract_type_in_decl, 1934 Sema::AbstractReturnType, 1935 AbstractClass); 1936 1937 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1938 E = FD->param_end(); I != E; ++I) { 1939 const ParmVarDecl *VD = *I; 1940 Invalid |= 1941 SemaRef.RequireNonAbstractType(VD->getLocation(), 1942 VD->getOriginalType(), 1943 diag::err_abstract_type_in_decl, 1944 Sema::AbstractParamType, 1945 AbstractClass); 1946 } 1947 1948 return Invalid; 1949 } 1950 1951 bool VisitDecl(const Decl* D) { 1952 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1953 return VisitDeclContext(DC); 1954 1955 return false; 1956 } 1957 }; 1958} 1959 1960/// \brief Perform semantic checks on a class definition that has been 1961/// completing, introducing implicitly-declared members, checking for 1962/// abstract types, etc. 1963void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 1964 if (!Record || Record->isInvalidDecl()) 1965 return; 1966 1967 if (!Record->isAbstract()) { 1968 // Collect all the pure virtual methods and see if this is an abstract 1969 // class after all. 1970 PureVirtualMethodCollector Collector(Context, Record); 1971 if (!Collector.empty()) 1972 Record->setAbstract(true); 1973 } 1974 1975 if (Record->isAbstract()) 1976 (void)AbstractClassUsageDiagnoser(*this, Record); 1977 1978 if (!Record->isDependentType() && !Record->isInvalidDecl()) 1979 AddImplicitlyDeclaredMembersToClass(Record); 1980} 1981 1982void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1983 DeclPtrTy TagDecl, 1984 SourceLocation LBrac, 1985 SourceLocation RBrac) { 1986 if (!TagDecl) 1987 return; 1988 1989 AdjustDeclIfTemplate(TagDecl); 1990 1991 ActOnFields(S, RLoc, TagDecl, 1992 (DeclPtrTy*)FieldCollector->getCurFields(), 1993 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1994 1995 CheckCompletedCXXClass( 1996 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 1997} 1998 1999/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2000/// special functions, such as the default constructor, copy 2001/// constructor, or destructor, to the given C++ class (C++ 2002/// [special]p1). This routine can only be executed just before the 2003/// definition of the class is complete. 2004void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2005 CanQualType ClassType 2006 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2007 2008 // FIXME: Implicit declarations have exception specifications, which are 2009 // the union of the specifications of the implicitly called functions. 2010 2011 if (!ClassDecl->hasUserDeclaredConstructor()) { 2012 // C++ [class.ctor]p5: 2013 // A default constructor for a class X is a constructor of class X 2014 // that can be called without an argument. If there is no 2015 // user-declared constructor for class X, a default constructor is 2016 // implicitly declared. An implicitly-declared default constructor 2017 // is an inline public member of its class. 2018 DeclarationName Name 2019 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2020 CXXConstructorDecl *DefaultCon = 2021 CXXConstructorDecl::Create(Context, ClassDecl, 2022 ClassDecl->getLocation(), Name, 2023 Context.getFunctionType(Context.VoidTy, 2024 0, 0, false, 0), 2025 /*DInfo=*/0, 2026 /*isExplicit=*/false, 2027 /*isInline=*/true, 2028 /*isImplicitlyDeclared=*/true); 2029 DefaultCon->setAccess(AS_public); 2030 DefaultCon->setImplicit(); 2031 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2032 ClassDecl->addDecl(DefaultCon); 2033 } 2034 2035 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2036 // C++ [class.copy]p4: 2037 // If the class definition does not explicitly declare a copy 2038 // constructor, one is declared implicitly. 2039 2040 // C++ [class.copy]p5: 2041 // The implicitly-declared copy constructor for a class X will 2042 // have the form 2043 // 2044 // X::X(const X&) 2045 // 2046 // if 2047 bool HasConstCopyConstructor = true; 2048 2049 // -- each direct or virtual base class B of X has a copy 2050 // constructor whose first parameter is of type const B& or 2051 // const volatile B&, and 2052 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2053 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2054 const CXXRecordDecl *BaseClassDecl 2055 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2056 HasConstCopyConstructor 2057 = BaseClassDecl->hasConstCopyConstructor(Context); 2058 } 2059 2060 // -- for all the nonstatic data members of X that are of a 2061 // class type M (or array thereof), each such class type 2062 // has a copy constructor whose first parameter is of type 2063 // const M& or const volatile M&. 2064 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2065 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2066 ++Field) { 2067 QualType FieldType = (*Field)->getType(); 2068 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2069 FieldType = Array->getElementType(); 2070 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2071 const CXXRecordDecl *FieldClassDecl 2072 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2073 HasConstCopyConstructor 2074 = FieldClassDecl->hasConstCopyConstructor(Context); 2075 } 2076 } 2077 2078 // Otherwise, the implicitly declared copy constructor will have 2079 // the form 2080 // 2081 // X::X(X&) 2082 QualType ArgType = ClassType; 2083 if (HasConstCopyConstructor) 2084 ArgType = ArgType.withConst(); 2085 ArgType = Context.getLValueReferenceType(ArgType); 2086 2087 // An implicitly-declared copy constructor is an inline public 2088 // member of its class. 2089 DeclarationName Name 2090 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2091 CXXConstructorDecl *CopyConstructor 2092 = CXXConstructorDecl::Create(Context, ClassDecl, 2093 ClassDecl->getLocation(), Name, 2094 Context.getFunctionType(Context.VoidTy, 2095 &ArgType, 1, 2096 false, 0), 2097 /*DInfo=*/0, 2098 /*isExplicit=*/false, 2099 /*isInline=*/true, 2100 /*isImplicitlyDeclared=*/true); 2101 CopyConstructor->setAccess(AS_public); 2102 CopyConstructor->setImplicit(); 2103 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2104 2105 // Add the parameter to the constructor. 2106 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2107 ClassDecl->getLocation(), 2108 /*IdentifierInfo=*/0, 2109 ArgType, /*DInfo=*/0, 2110 VarDecl::None, 0); 2111 CopyConstructor->setParams(Context, &FromParam, 1); 2112 ClassDecl->addDecl(CopyConstructor); 2113 } 2114 2115 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2116 // Note: The following rules are largely analoguous to the copy 2117 // constructor rules. Note that virtual bases are not taken into account 2118 // for determining the argument type of the operator. Note also that 2119 // operators taking an object instead of a reference are allowed. 2120 // 2121 // C++ [class.copy]p10: 2122 // If the class definition does not explicitly declare a copy 2123 // assignment operator, one is declared implicitly. 2124 // The implicitly-defined copy assignment operator for a class X 2125 // will have the form 2126 // 2127 // X& X::operator=(const X&) 2128 // 2129 // if 2130 bool HasConstCopyAssignment = true; 2131 2132 // -- each direct base class B of X has a copy assignment operator 2133 // whose parameter is of type const B&, const volatile B& or B, 2134 // and 2135 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2136 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2137 assert(!Base->getType()->isDependentType() && 2138 "Cannot generate implicit members for class with dependent bases."); 2139 const CXXRecordDecl *BaseClassDecl 2140 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2141 const CXXMethodDecl *MD = 0; 2142 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2143 MD); 2144 } 2145 2146 // -- for all the nonstatic data members of X that are of a class 2147 // type M (or array thereof), each such class type has a copy 2148 // assignment operator whose parameter is of type const M&, 2149 // const volatile M& or M. 2150 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2151 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2152 ++Field) { 2153 QualType FieldType = (*Field)->getType(); 2154 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2155 FieldType = Array->getElementType(); 2156 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2157 const CXXRecordDecl *FieldClassDecl 2158 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2159 const CXXMethodDecl *MD = 0; 2160 HasConstCopyAssignment 2161 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2162 } 2163 } 2164 2165 // Otherwise, the implicitly declared copy assignment operator will 2166 // have the form 2167 // 2168 // X& X::operator=(X&) 2169 QualType ArgType = ClassType; 2170 QualType RetType = Context.getLValueReferenceType(ArgType); 2171 if (HasConstCopyAssignment) 2172 ArgType = ArgType.withConst(); 2173 ArgType = Context.getLValueReferenceType(ArgType); 2174 2175 // An implicitly-declared copy assignment operator is an inline public 2176 // member of its class. 2177 DeclarationName Name = 2178 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2179 CXXMethodDecl *CopyAssignment = 2180 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2181 Context.getFunctionType(RetType, &ArgType, 1, 2182 false, 0), 2183 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2184 CopyAssignment->setAccess(AS_public); 2185 CopyAssignment->setImplicit(); 2186 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2187 CopyAssignment->setCopyAssignment(true); 2188 2189 // Add the parameter to the operator. 2190 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2191 ClassDecl->getLocation(), 2192 /*IdentifierInfo=*/0, 2193 ArgType, /*DInfo=*/0, 2194 VarDecl::None, 0); 2195 CopyAssignment->setParams(Context, &FromParam, 1); 2196 2197 // Don't call addedAssignmentOperator. There is no way to distinguish an 2198 // implicit from an explicit assignment operator. 2199 ClassDecl->addDecl(CopyAssignment); 2200 AddOverriddenMethods(ClassDecl, CopyAssignment); 2201 } 2202 2203 if (!ClassDecl->hasUserDeclaredDestructor()) { 2204 // C++ [class.dtor]p2: 2205 // If a class has no user-declared destructor, a destructor is 2206 // declared implicitly. An implicitly-declared destructor is an 2207 // inline public member of its class. 2208 DeclarationName Name 2209 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2210 CXXDestructorDecl *Destructor 2211 = CXXDestructorDecl::Create(Context, ClassDecl, 2212 ClassDecl->getLocation(), Name, 2213 Context.getFunctionType(Context.VoidTy, 2214 0, 0, false, 0), 2215 /*isInline=*/true, 2216 /*isImplicitlyDeclared=*/true); 2217 Destructor->setAccess(AS_public); 2218 Destructor->setImplicit(); 2219 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2220 ClassDecl->addDecl(Destructor); 2221 2222 AddOverriddenMethods(ClassDecl, Destructor); 2223 } 2224} 2225 2226void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2227 Decl *D = TemplateD.getAs<Decl>(); 2228 if (!D) 2229 return; 2230 2231 TemplateParameterList *Params = 0; 2232 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2233 Params = Template->getTemplateParameters(); 2234 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2235 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2236 Params = PartialSpec->getTemplateParameters(); 2237 else 2238 return; 2239 2240 for (TemplateParameterList::iterator Param = Params->begin(), 2241 ParamEnd = Params->end(); 2242 Param != ParamEnd; ++Param) { 2243 NamedDecl *Named = cast<NamedDecl>(*Param); 2244 if (Named->getDeclName()) { 2245 S->AddDecl(DeclPtrTy::make(Named)); 2246 IdResolver.AddDecl(Named); 2247 } 2248 } 2249} 2250 2251/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2252/// parsing a top-level (non-nested) C++ class, and we are now 2253/// parsing those parts of the given Method declaration that could 2254/// not be parsed earlier (C++ [class.mem]p2), such as default 2255/// arguments. This action should enter the scope of the given 2256/// Method declaration as if we had just parsed the qualified method 2257/// name. However, it should not bring the parameters into scope; 2258/// that will be performed by ActOnDelayedCXXMethodParameter. 2259void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2260 if (!MethodD) 2261 return; 2262 2263 AdjustDeclIfTemplate(MethodD); 2264 2265 CXXScopeSpec SS; 2266 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2267 QualType ClassTy 2268 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2269 SS.setScopeRep( 2270 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2271 ActOnCXXEnterDeclaratorScope(S, SS); 2272} 2273 2274/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2275/// C++ method declaration. We're (re-)introducing the given 2276/// function parameter into scope for use in parsing later parts of 2277/// the method declaration. For example, we could see an 2278/// ActOnParamDefaultArgument event for this parameter. 2279void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2280 if (!ParamD) 2281 return; 2282 2283 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2284 2285 // If this parameter has an unparsed default argument, clear it out 2286 // to make way for the parsed default argument. 2287 if (Param->hasUnparsedDefaultArg()) 2288 Param->setDefaultArg(0); 2289 2290 S->AddDecl(DeclPtrTy::make(Param)); 2291 if (Param->getDeclName()) 2292 IdResolver.AddDecl(Param); 2293} 2294 2295/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2296/// processing the delayed method declaration for Method. The method 2297/// declaration is now considered finished. There may be a separate 2298/// ActOnStartOfFunctionDef action later (not necessarily 2299/// immediately!) for this method, if it was also defined inside the 2300/// class body. 2301void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2302 if (!MethodD) 2303 return; 2304 2305 AdjustDeclIfTemplate(MethodD); 2306 2307 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2308 CXXScopeSpec SS; 2309 QualType ClassTy 2310 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2311 SS.setScopeRep( 2312 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2313 ActOnCXXExitDeclaratorScope(S, SS); 2314 2315 // Now that we have our default arguments, check the constructor 2316 // again. It could produce additional diagnostics or affect whether 2317 // the class has implicitly-declared destructors, among other 2318 // things. 2319 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2320 CheckConstructor(Constructor); 2321 2322 // Check the default arguments, which we may have added. 2323 if (!Method->isInvalidDecl()) 2324 CheckCXXDefaultArguments(Method); 2325} 2326 2327/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2328/// the well-formedness of the constructor declarator @p D with type @p 2329/// R. If there are any errors in the declarator, this routine will 2330/// emit diagnostics and set the invalid bit to true. In any case, the type 2331/// will be updated to reflect a well-formed type for the constructor and 2332/// returned. 2333QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2334 FunctionDecl::StorageClass &SC) { 2335 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2336 2337 // C++ [class.ctor]p3: 2338 // A constructor shall not be virtual (10.3) or static (9.4). A 2339 // constructor can be invoked for a const, volatile or const 2340 // volatile object. A constructor shall not be declared const, 2341 // volatile, or const volatile (9.3.2). 2342 if (isVirtual) { 2343 if (!D.isInvalidType()) 2344 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2345 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2346 << SourceRange(D.getIdentifierLoc()); 2347 D.setInvalidType(); 2348 } 2349 if (SC == FunctionDecl::Static) { 2350 if (!D.isInvalidType()) 2351 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2352 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2353 << SourceRange(D.getIdentifierLoc()); 2354 D.setInvalidType(); 2355 SC = FunctionDecl::None; 2356 } 2357 2358 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2359 if (FTI.TypeQuals != 0) { 2360 if (FTI.TypeQuals & Qualifiers::Const) 2361 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2362 << "const" << SourceRange(D.getIdentifierLoc()); 2363 if (FTI.TypeQuals & Qualifiers::Volatile) 2364 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2365 << "volatile" << SourceRange(D.getIdentifierLoc()); 2366 if (FTI.TypeQuals & Qualifiers::Restrict) 2367 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2368 << "restrict" << SourceRange(D.getIdentifierLoc()); 2369 } 2370 2371 // Rebuild the function type "R" without any type qualifiers (in 2372 // case any of the errors above fired) and with "void" as the 2373 // return type, since constructors don't have return types. We 2374 // *always* have to do this, because GetTypeForDeclarator will 2375 // put in a result type of "int" when none was specified. 2376 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2377 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2378 Proto->getNumArgs(), 2379 Proto->isVariadic(), 0); 2380} 2381 2382/// CheckConstructor - Checks a fully-formed constructor for 2383/// well-formedness, issuing any diagnostics required. Returns true if 2384/// the constructor declarator is invalid. 2385void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2386 CXXRecordDecl *ClassDecl 2387 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2388 if (!ClassDecl) 2389 return Constructor->setInvalidDecl(); 2390 2391 // C++ [class.copy]p3: 2392 // A declaration of a constructor for a class X is ill-formed if 2393 // its first parameter is of type (optionally cv-qualified) X and 2394 // either there are no other parameters or else all other 2395 // parameters have default arguments. 2396 if (!Constructor->isInvalidDecl() && 2397 ((Constructor->getNumParams() == 1) || 2398 (Constructor->getNumParams() > 1 && 2399 Constructor->getParamDecl(1)->hasDefaultArg())) && 2400 Constructor->getTemplateSpecializationKind() 2401 != TSK_ImplicitInstantiation) { 2402 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2403 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2404 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2405 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2406 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2407 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2408 2409 // FIXME: Rather that making the constructor invalid, we should endeavor 2410 // to fix the type. 2411 Constructor->setInvalidDecl(); 2412 } 2413 } 2414 2415 // Notify the class that we've added a constructor. 2416 ClassDecl->addedConstructor(Context, Constructor); 2417} 2418 2419/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2420/// issuing any diagnostics required. Returns true on error. 2421bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2422 CXXRecordDecl *RD = Destructor->getParent(); 2423 2424 if (Destructor->isVirtual()) { 2425 SourceLocation Loc; 2426 2427 if (!Destructor->isImplicit()) 2428 Loc = Destructor->getLocation(); 2429 else 2430 Loc = RD->getLocation(); 2431 2432 // If we have a virtual destructor, look up the deallocation function 2433 FunctionDecl *OperatorDelete = 0; 2434 DeclarationName Name = 2435 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2436 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2437 return true; 2438 2439 Destructor->setOperatorDelete(OperatorDelete); 2440 } 2441 2442 return false; 2443} 2444 2445static inline bool 2446FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2447 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2448 FTI.ArgInfo[0].Param && 2449 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2450} 2451 2452/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2453/// the well-formednes of the destructor declarator @p D with type @p 2454/// R. If there are any errors in the declarator, this routine will 2455/// emit diagnostics and set the declarator to invalid. Even if this happens, 2456/// will be updated to reflect a well-formed type for the destructor and 2457/// returned. 2458QualType Sema::CheckDestructorDeclarator(Declarator &D, 2459 FunctionDecl::StorageClass& SC) { 2460 // C++ [class.dtor]p1: 2461 // [...] A typedef-name that names a class is a class-name 2462 // (7.1.3); however, a typedef-name that names a class shall not 2463 // be used as the identifier in the declarator for a destructor 2464 // declaration. 2465 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2466 if (isa<TypedefType>(DeclaratorType)) { 2467 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2468 << DeclaratorType; 2469 D.setInvalidType(); 2470 } 2471 2472 // C++ [class.dtor]p2: 2473 // A destructor is used to destroy objects of its class type. A 2474 // destructor takes no parameters, and no return type can be 2475 // specified for it (not even void). The address of a destructor 2476 // shall not be taken. A destructor shall not be static. A 2477 // destructor can be invoked for a const, volatile or const 2478 // volatile object. A destructor shall not be declared const, 2479 // volatile or const volatile (9.3.2). 2480 if (SC == FunctionDecl::Static) { 2481 if (!D.isInvalidType()) 2482 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2483 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2484 << SourceRange(D.getIdentifierLoc()); 2485 SC = FunctionDecl::None; 2486 D.setInvalidType(); 2487 } 2488 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2489 // Destructors don't have return types, but the parser will 2490 // happily parse something like: 2491 // 2492 // class X { 2493 // float ~X(); 2494 // }; 2495 // 2496 // The return type will be eliminated later. 2497 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2498 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2499 << SourceRange(D.getIdentifierLoc()); 2500 } 2501 2502 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2503 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2504 if (FTI.TypeQuals & Qualifiers::Const) 2505 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2506 << "const" << SourceRange(D.getIdentifierLoc()); 2507 if (FTI.TypeQuals & Qualifiers::Volatile) 2508 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2509 << "volatile" << SourceRange(D.getIdentifierLoc()); 2510 if (FTI.TypeQuals & Qualifiers::Restrict) 2511 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2512 << "restrict" << SourceRange(D.getIdentifierLoc()); 2513 D.setInvalidType(); 2514 } 2515 2516 // Make sure we don't have any parameters. 2517 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2518 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2519 2520 // Delete the parameters. 2521 FTI.freeArgs(); 2522 D.setInvalidType(); 2523 } 2524 2525 // Make sure the destructor isn't variadic. 2526 if (FTI.isVariadic) { 2527 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2528 D.setInvalidType(); 2529 } 2530 2531 // Rebuild the function type "R" without any type qualifiers or 2532 // parameters (in case any of the errors above fired) and with 2533 // "void" as the return type, since destructors don't have return 2534 // types. We *always* have to do this, because GetTypeForDeclarator 2535 // will put in a result type of "int" when none was specified. 2536 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2537} 2538 2539/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2540/// well-formednes of the conversion function declarator @p D with 2541/// type @p R. If there are any errors in the declarator, this routine 2542/// will emit diagnostics and return true. Otherwise, it will return 2543/// false. Either way, the type @p R will be updated to reflect a 2544/// well-formed type for the conversion operator. 2545void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2546 FunctionDecl::StorageClass& SC) { 2547 // C++ [class.conv.fct]p1: 2548 // Neither parameter types nor return type can be specified. The 2549 // type of a conversion function (8.3.5) is "function taking no 2550 // parameter returning conversion-type-id." 2551 if (SC == FunctionDecl::Static) { 2552 if (!D.isInvalidType()) 2553 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2554 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2555 << SourceRange(D.getIdentifierLoc()); 2556 D.setInvalidType(); 2557 SC = FunctionDecl::None; 2558 } 2559 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2560 // Conversion functions don't have return types, but the parser will 2561 // happily parse something like: 2562 // 2563 // class X { 2564 // float operator bool(); 2565 // }; 2566 // 2567 // The return type will be changed later anyway. 2568 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2569 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2570 << SourceRange(D.getIdentifierLoc()); 2571 } 2572 2573 // Make sure we don't have any parameters. 2574 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2575 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2576 2577 // Delete the parameters. 2578 D.getTypeObject(0).Fun.freeArgs(); 2579 D.setInvalidType(); 2580 } 2581 2582 // Make sure the conversion function isn't variadic. 2583 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2584 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2585 D.setInvalidType(); 2586 } 2587 2588 // C++ [class.conv.fct]p4: 2589 // The conversion-type-id shall not represent a function type nor 2590 // an array type. 2591 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2592 if (ConvType->isArrayType()) { 2593 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2594 ConvType = Context.getPointerType(ConvType); 2595 D.setInvalidType(); 2596 } else if (ConvType->isFunctionType()) { 2597 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2598 ConvType = Context.getPointerType(ConvType); 2599 D.setInvalidType(); 2600 } 2601 2602 // Rebuild the function type "R" without any parameters (in case any 2603 // of the errors above fired) and with the conversion type as the 2604 // return type. 2605 R = Context.getFunctionType(ConvType, 0, 0, false, 2606 R->getAs<FunctionProtoType>()->getTypeQuals()); 2607 2608 // C++0x explicit conversion operators. 2609 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2610 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2611 diag::warn_explicit_conversion_functions) 2612 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2613} 2614 2615/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2616/// the declaration of the given C++ conversion function. This routine 2617/// is responsible for recording the conversion function in the C++ 2618/// class, if possible. 2619Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2620 assert(Conversion && "Expected to receive a conversion function declaration"); 2621 2622 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2623 2624 // Make sure we aren't redeclaring the conversion function. 2625 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2626 2627 // C++ [class.conv.fct]p1: 2628 // [...] A conversion function is never used to convert a 2629 // (possibly cv-qualified) object to the (possibly cv-qualified) 2630 // same object type (or a reference to it), to a (possibly 2631 // cv-qualified) base class of that type (or a reference to it), 2632 // or to (possibly cv-qualified) void. 2633 // FIXME: Suppress this warning if the conversion function ends up being a 2634 // virtual function that overrides a virtual function in a base class. 2635 QualType ClassType 2636 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2637 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2638 ConvType = ConvTypeRef->getPointeeType(); 2639 if (ConvType->isRecordType()) { 2640 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2641 if (ConvType == ClassType) 2642 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2643 << ClassType; 2644 else if (IsDerivedFrom(ClassType, ConvType)) 2645 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2646 << ClassType << ConvType; 2647 } else if (ConvType->isVoidType()) { 2648 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2649 << ClassType << ConvType; 2650 } 2651 2652 if (Conversion->getPreviousDeclaration()) { 2653 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2654 if (FunctionTemplateDecl *ConversionTemplate 2655 = Conversion->getDescribedFunctionTemplate()) 2656 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2657 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2658 return DeclPtrTy::make(Conversion); 2659 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2660 } else if (FunctionTemplateDecl *ConversionTemplate 2661 = Conversion->getDescribedFunctionTemplate()) 2662 ClassDecl->addConversionFunction(ConversionTemplate); 2663 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2664 ClassDecl->addConversionFunction(Conversion); 2665 2666 return DeclPtrTy::make(Conversion); 2667} 2668 2669//===----------------------------------------------------------------------===// 2670// Namespace Handling 2671//===----------------------------------------------------------------------===// 2672 2673/// ActOnStartNamespaceDef - This is called at the start of a namespace 2674/// definition. 2675Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2676 SourceLocation IdentLoc, 2677 IdentifierInfo *II, 2678 SourceLocation LBrace) { 2679 NamespaceDecl *Namespc = 2680 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2681 Namespc->setLBracLoc(LBrace); 2682 2683 Scope *DeclRegionScope = NamespcScope->getParent(); 2684 2685 if (II) { 2686 // C++ [namespace.def]p2: 2687 // The identifier in an original-namespace-definition shall not have been 2688 // previously defined in the declarative region in which the 2689 // original-namespace-definition appears. The identifier in an 2690 // original-namespace-definition is the name of the namespace. Subsequently 2691 // in that declarative region, it is treated as an original-namespace-name. 2692 2693 NamedDecl *PrevDecl 2694 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2695 ForRedeclaration); 2696 2697 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2698 // This is an extended namespace definition. 2699 // Attach this namespace decl to the chain of extended namespace 2700 // definitions. 2701 OrigNS->setNextNamespace(Namespc); 2702 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2703 2704 // Remove the previous declaration from the scope. 2705 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2706 IdResolver.RemoveDecl(OrigNS); 2707 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2708 } 2709 } else if (PrevDecl) { 2710 // This is an invalid name redefinition. 2711 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2712 << Namespc->getDeclName(); 2713 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2714 Namespc->setInvalidDecl(); 2715 // Continue on to push Namespc as current DeclContext and return it. 2716 } else if (II->isStr("std") && 2717 CurContext->getLookupContext()->isTranslationUnit()) { 2718 // This is the first "real" definition of the namespace "std", so update 2719 // our cache of the "std" namespace to point at this definition. 2720 if (StdNamespace) { 2721 // We had already defined a dummy namespace "std". Link this new 2722 // namespace definition to the dummy namespace "std". 2723 StdNamespace->setNextNamespace(Namespc); 2724 StdNamespace->setLocation(IdentLoc); 2725 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2726 } 2727 2728 // Make our StdNamespace cache point at the first real definition of the 2729 // "std" namespace. 2730 StdNamespace = Namespc; 2731 } 2732 2733 PushOnScopeChains(Namespc, DeclRegionScope); 2734 } else { 2735 // Anonymous namespaces. 2736 2737 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2738 // behaves as if it were replaced by 2739 // namespace unique { /* empty body */ } 2740 // using namespace unique; 2741 // namespace unique { namespace-body } 2742 // where all occurrences of 'unique' in a translation unit are 2743 // replaced by the same identifier and this identifier differs 2744 // from all other identifiers in the entire program. 2745 2746 // We just create the namespace with an empty name and then add an 2747 // implicit using declaration, just like the standard suggests. 2748 // 2749 // CodeGen enforces the "universally unique" aspect by giving all 2750 // declarations semantically contained within an anonymous 2751 // namespace internal linkage. 2752 2753 assert(Namespc->isAnonymousNamespace()); 2754 CurContext->addDecl(Namespc); 2755 2756 UsingDirectiveDecl* UD 2757 = UsingDirectiveDecl::Create(Context, CurContext, 2758 /* 'using' */ LBrace, 2759 /* 'namespace' */ SourceLocation(), 2760 /* qualifier */ SourceRange(), 2761 /* NNS */ NULL, 2762 /* identifier */ SourceLocation(), 2763 Namespc, 2764 /* Ancestor */ CurContext); 2765 UD->setImplicit(); 2766 CurContext->addDecl(UD); 2767 } 2768 2769 // Although we could have an invalid decl (i.e. the namespace name is a 2770 // redefinition), push it as current DeclContext and try to continue parsing. 2771 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2772 // for the namespace has the declarations that showed up in that particular 2773 // namespace definition. 2774 PushDeclContext(NamespcScope, Namespc); 2775 return DeclPtrTy::make(Namespc); 2776} 2777 2778/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2779/// is a namespace alias, returns the namespace it points to. 2780static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2781 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2782 return AD->getNamespace(); 2783 return dyn_cast_or_null<NamespaceDecl>(D); 2784} 2785 2786/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2787/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2788void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2789 Decl *Dcl = D.getAs<Decl>(); 2790 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2791 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2792 Namespc->setRBracLoc(RBrace); 2793 PopDeclContext(); 2794} 2795 2796Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2797 SourceLocation UsingLoc, 2798 SourceLocation NamespcLoc, 2799 const CXXScopeSpec &SS, 2800 SourceLocation IdentLoc, 2801 IdentifierInfo *NamespcName, 2802 AttributeList *AttrList) { 2803 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2804 assert(NamespcName && "Invalid NamespcName."); 2805 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2806 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2807 2808 UsingDirectiveDecl *UDir = 0; 2809 2810 // Lookup namespace name. 2811 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2812 LookupParsedName(R, S, &SS); 2813 if (R.isAmbiguous()) 2814 return DeclPtrTy(); 2815 2816 if (!R.empty()) { 2817 NamedDecl *Named = R.getFoundDecl(); 2818 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2819 && "expected namespace decl"); 2820 // C++ [namespace.udir]p1: 2821 // A using-directive specifies that the names in the nominated 2822 // namespace can be used in the scope in which the 2823 // using-directive appears after the using-directive. During 2824 // unqualified name lookup (3.4.1), the names appear as if they 2825 // were declared in the nearest enclosing namespace which 2826 // contains both the using-directive and the nominated 2827 // namespace. [Note: in this context, "contains" means "contains 2828 // directly or indirectly". ] 2829 2830 // Find enclosing context containing both using-directive and 2831 // nominated namespace. 2832 NamespaceDecl *NS = getNamespaceDecl(Named); 2833 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2834 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2835 CommonAncestor = CommonAncestor->getParent(); 2836 2837 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2838 SS.getRange(), 2839 (NestedNameSpecifier *)SS.getScopeRep(), 2840 IdentLoc, Named, CommonAncestor); 2841 PushUsingDirective(S, UDir); 2842 } else { 2843 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2844 } 2845 2846 // FIXME: We ignore attributes for now. 2847 delete AttrList; 2848 return DeclPtrTy::make(UDir); 2849} 2850 2851void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2852 // If scope has associated entity, then using directive is at namespace 2853 // or translation unit scope. We add UsingDirectiveDecls, into 2854 // it's lookup structure. 2855 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2856 Ctx->addDecl(UDir); 2857 else 2858 // Otherwise it is block-sope. using-directives will affect lookup 2859 // only to the end of scope. 2860 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2861} 2862 2863 2864Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2865 AccessSpecifier AS, 2866 SourceLocation UsingLoc, 2867 const CXXScopeSpec &SS, 2868 UnqualifiedId &Name, 2869 AttributeList *AttrList, 2870 bool IsTypeName, 2871 SourceLocation TypenameLoc) { 2872 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2873 2874 switch (Name.getKind()) { 2875 case UnqualifiedId::IK_Identifier: 2876 case UnqualifiedId::IK_OperatorFunctionId: 2877 case UnqualifiedId::IK_LiteralOperatorId: 2878 case UnqualifiedId::IK_ConversionFunctionId: 2879 break; 2880 2881 case UnqualifiedId::IK_ConstructorName: 2882 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2883 << SS.getRange(); 2884 return DeclPtrTy(); 2885 2886 case UnqualifiedId::IK_DestructorName: 2887 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2888 << SS.getRange(); 2889 return DeclPtrTy(); 2890 2891 case UnqualifiedId::IK_TemplateId: 2892 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2893 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2894 return DeclPtrTy(); 2895 } 2896 2897 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2898 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2899 Name.getSourceRange().getBegin(), 2900 TargetName, AttrList, 2901 /* IsInstantiation */ false, 2902 IsTypeName, TypenameLoc); 2903 if (UD) { 2904 PushOnScopeChains(UD, S); 2905 UD->setAccess(AS); 2906 } 2907 2908 return DeclPtrTy::make(UD); 2909} 2910 2911/// Builds a shadow declaration corresponding to a 'using' declaration. 2912static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S, 2913 AccessSpecifier AS, 2914 UsingDecl *UD, NamedDecl *Orig) { 2915 // FIXME: diagnose hiding, collisions 2916 2917 // If we resolved to another shadow declaration, just coalesce them. 2918 if (isa<UsingShadowDecl>(Orig)) { 2919 Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl(); 2920 assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration"); 2921 } 2922 2923 UsingShadowDecl *Shadow 2924 = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext, 2925 UD->getLocation(), UD, Orig); 2926 UD->addShadowDecl(Shadow); 2927 2928 if (S) 2929 SemaRef.PushOnScopeChains(Shadow, S); 2930 else 2931 SemaRef.CurContext->addDecl(Shadow); 2932 Shadow->setAccess(AS); 2933 2934 return Shadow; 2935} 2936 2937/// Builds a using declaration. 2938/// 2939/// \param IsInstantiation - Whether this call arises from an 2940/// instantiation of an unresolved using declaration. We treat 2941/// the lookup differently for these declarations. 2942NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 2943 SourceLocation UsingLoc, 2944 const CXXScopeSpec &SS, 2945 SourceLocation IdentLoc, 2946 DeclarationName Name, 2947 AttributeList *AttrList, 2948 bool IsInstantiation, 2949 bool IsTypeName, 2950 SourceLocation TypenameLoc) { 2951 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2952 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2953 2954 // FIXME: We ignore attributes for now. 2955 delete AttrList; 2956 2957 if (SS.isEmpty()) { 2958 Diag(IdentLoc, diag::err_using_requires_qualname); 2959 return 0; 2960 } 2961 2962 NestedNameSpecifier *NNS = 2963 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2964 2965 DeclContext *LookupContext = computeDeclContext(SS); 2966 if (!LookupContext) { 2967 if (IsTypeName) { 2968 return UnresolvedUsingTypenameDecl::Create(Context, CurContext, 2969 UsingLoc, TypenameLoc, 2970 SS.getRange(), NNS, 2971 IdentLoc, Name); 2972 } else { 2973 return UnresolvedUsingValueDecl::Create(Context, CurContext, 2974 UsingLoc, SS.getRange(), NNS, 2975 IdentLoc, Name); 2976 } 2977 } 2978 2979 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2980 // C++0x N2914 [namespace.udecl]p3: 2981 // A using-declaration used as a member-declaration shall refer to a member 2982 // of a base class of the class being defined, shall refer to a member of an 2983 // anonymous union that is a member of a base class of the class being 2984 // defined, or shall refer to an enumerator for an enumeration type that is 2985 // a member of a base class of the class being defined. 2986 2987 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2988 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2989 Diag(SS.getRange().getBegin(), 2990 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2991 << NNS << RD->getDeclName(); 2992 return 0; 2993 } 2994 } else { 2995 // C++0x N2914 [namespace.udecl]p8: 2996 // A using-declaration for a class member shall be a member-declaration. 2997 if (isa<CXXRecordDecl>(LookupContext)) { 2998 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2999 << SS.getRange(); 3000 return 0; 3001 } 3002 } 3003 3004 // Look up the target name. Unlike most lookups, we do not want to 3005 // hide tag declarations: tag names are visible through the using 3006 // declaration even if hidden by ordinary names. 3007 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3008 3009 // We don't hide tags behind ordinary decls if we're in a 3010 // non-dependent context, but in a dependent context, this is 3011 // important for the stability of two-phase lookup. 3012 if (!IsInstantiation) 3013 R.setHideTags(false); 3014 3015 LookupQualifiedName(R, LookupContext); 3016 3017 if (R.empty()) { 3018 Diag(IdentLoc, diag::err_no_member) 3019 << Name << LookupContext << SS.getRange(); 3020 return 0; 3021 } 3022 3023 if (R.isAmbiguous()) 3024 return 0; 3025 3026 if (IsTypeName) { 3027 // If we asked for a typename and got a non-type decl, error out. 3028 if (R.getResultKind() != LookupResult::Found 3029 || !isa<TypeDecl>(R.getFoundDecl())) { 3030 Diag(IdentLoc, diag::err_using_typename_non_type); 3031 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3032 Diag((*I)->getUnderlyingDecl()->getLocation(), 3033 diag::note_using_decl_target); 3034 return 0; 3035 } 3036 } else { 3037 // If we asked for a non-typename and we got a type, error out, 3038 // but only if this is an instantiation of an unresolved using 3039 // decl. Otherwise just silently find the type name. 3040 if (IsInstantiation && 3041 R.getResultKind() == LookupResult::Found && 3042 isa<TypeDecl>(R.getFoundDecl())) { 3043 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3044 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3045 return 0; 3046 } 3047 } 3048 3049 // C++0x N2914 [namespace.udecl]p6: 3050 // A using-declaration shall not name a namespace. 3051 if (R.getResultKind() == LookupResult::Found 3052 && isa<NamespaceDecl>(R.getFoundDecl())) { 3053 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3054 << SS.getRange(); 3055 return 0; 3056 } 3057 3058 UsingDecl *UD = UsingDecl::Create(Context, CurContext, IdentLoc, 3059 SS.getRange(), UsingLoc, NNS, Name, 3060 IsTypeName); 3061 3062 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3063 BuildUsingShadowDecl(*this, S, AS, UD, *I); 3064 3065 return UD; 3066} 3067 3068Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3069 SourceLocation NamespaceLoc, 3070 SourceLocation AliasLoc, 3071 IdentifierInfo *Alias, 3072 const CXXScopeSpec &SS, 3073 SourceLocation IdentLoc, 3074 IdentifierInfo *Ident) { 3075 3076 // Lookup the namespace name. 3077 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3078 LookupParsedName(R, S, &SS); 3079 3080 // Check if we have a previous declaration with the same name. 3081 if (NamedDecl *PrevDecl 3082 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3083 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3084 // We already have an alias with the same name that points to the same 3085 // namespace, so don't create a new one. 3086 if (!R.isAmbiguous() && !R.empty() && 3087 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3088 return DeclPtrTy(); 3089 } 3090 3091 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3092 diag::err_redefinition_different_kind; 3093 Diag(AliasLoc, DiagID) << Alias; 3094 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3095 return DeclPtrTy(); 3096 } 3097 3098 if (R.isAmbiguous()) 3099 return DeclPtrTy(); 3100 3101 if (R.empty()) { 3102 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3103 return DeclPtrTy(); 3104 } 3105 3106 NamespaceAliasDecl *AliasDecl = 3107 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3108 Alias, SS.getRange(), 3109 (NestedNameSpecifier *)SS.getScopeRep(), 3110 IdentLoc, R.getFoundDecl()); 3111 3112 CurContext->addDecl(AliasDecl); 3113 return DeclPtrTy::make(AliasDecl); 3114} 3115 3116void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3117 CXXConstructorDecl *Constructor) { 3118 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3119 !Constructor->isUsed()) && 3120 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3121 3122 CXXRecordDecl *ClassDecl 3123 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3124 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3125 3126 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3127 Diag(CurrentLocation, diag::note_member_synthesized_at) 3128 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3129 Constructor->setInvalidDecl(); 3130 } else { 3131 Constructor->setUsed(); 3132 } 3133 3134 MaybeMarkVirtualImplicitMembersReferenced(CurrentLocation, Constructor); 3135} 3136 3137void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3138 CXXDestructorDecl *Destructor) { 3139 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3140 "DefineImplicitDestructor - call it for implicit default dtor"); 3141 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3142 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3143 // C++ [class.dtor] p5 3144 // Before the implicitly-declared default destructor for a class is 3145 // implicitly defined, all the implicitly-declared default destructors 3146 // for its base class and its non-static data members shall have been 3147 // implicitly defined. 3148 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3149 E = ClassDecl->bases_end(); Base != E; ++Base) { 3150 CXXRecordDecl *BaseClassDecl 3151 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3152 if (!BaseClassDecl->hasTrivialDestructor()) { 3153 if (CXXDestructorDecl *BaseDtor = 3154 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3155 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3156 else 3157 assert(false && 3158 "DefineImplicitDestructor - missing dtor in a base class"); 3159 } 3160 } 3161 3162 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3163 E = ClassDecl->field_end(); Field != E; ++Field) { 3164 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3165 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3166 FieldType = Array->getElementType(); 3167 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3168 CXXRecordDecl *FieldClassDecl 3169 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3170 if (!FieldClassDecl->hasTrivialDestructor()) { 3171 if (CXXDestructorDecl *FieldDtor = 3172 const_cast<CXXDestructorDecl*>( 3173 FieldClassDecl->getDestructor(Context))) 3174 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3175 else 3176 assert(false && 3177 "DefineImplicitDestructor - missing dtor in class of a data member"); 3178 } 3179 } 3180 } 3181 3182 // FIXME: If CheckDestructor fails, we should emit a note about where the 3183 // implicit destructor was needed. 3184 if (CheckDestructor(Destructor)) { 3185 Diag(CurrentLocation, diag::note_member_synthesized_at) 3186 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3187 3188 Destructor->setInvalidDecl(); 3189 return; 3190 } 3191 3192 Destructor->setUsed(); 3193} 3194 3195void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3196 CXXMethodDecl *MethodDecl) { 3197 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3198 MethodDecl->getOverloadedOperator() == OO_Equal && 3199 !MethodDecl->isUsed()) && 3200 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3201 3202 CXXRecordDecl *ClassDecl 3203 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3204 3205 // C++[class.copy] p12 3206 // Before the implicitly-declared copy assignment operator for a class is 3207 // implicitly defined, all implicitly-declared copy assignment operators 3208 // for its direct base classes and its nonstatic data members shall have 3209 // been implicitly defined. 3210 bool err = false; 3211 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3212 E = ClassDecl->bases_end(); Base != E; ++Base) { 3213 CXXRecordDecl *BaseClassDecl 3214 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3215 if (CXXMethodDecl *BaseAssignOpMethod = 3216 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3217 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3218 } 3219 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3220 E = ClassDecl->field_end(); Field != E; ++Field) { 3221 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3222 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3223 FieldType = Array->getElementType(); 3224 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3225 CXXRecordDecl *FieldClassDecl 3226 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3227 if (CXXMethodDecl *FieldAssignOpMethod = 3228 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3229 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3230 } else if (FieldType->isReferenceType()) { 3231 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3232 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3233 Diag(Field->getLocation(), diag::note_declared_at); 3234 Diag(CurrentLocation, diag::note_first_required_here); 3235 err = true; 3236 } else if (FieldType.isConstQualified()) { 3237 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3238 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3239 Diag(Field->getLocation(), diag::note_declared_at); 3240 Diag(CurrentLocation, diag::note_first_required_here); 3241 err = true; 3242 } 3243 } 3244 if (!err) 3245 MethodDecl->setUsed(); 3246} 3247 3248CXXMethodDecl * 3249Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3250 CXXRecordDecl *ClassDecl) { 3251 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3252 QualType RHSType(LHSType); 3253 // If class's assignment operator argument is const/volatile qualified, 3254 // look for operator = (const/volatile B&). Otherwise, look for 3255 // operator = (B&). 3256 RHSType = Context.getCVRQualifiedType(RHSType, 3257 ParmDecl->getType().getCVRQualifiers()); 3258 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3259 LHSType, 3260 SourceLocation())); 3261 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3262 RHSType, 3263 SourceLocation())); 3264 Expr *Args[2] = { &*LHS, &*RHS }; 3265 OverloadCandidateSet CandidateSet; 3266 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3267 CandidateSet); 3268 OverloadCandidateSet::iterator Best; 3269 if (BestViableFunction(CandidateSet, 3270 ClassDecl->getLocation(), Best) == OR_Success) 3271 return cast<CXXMethodDecl>(Best->Function); 3272 assert(false && 3273 "getAssignOperatorMethod - copy assignment operator method not found"); 3274 return 0; 3275} 3276 3277void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3278 CXXConstructorDecl *CopyConstructor, 3279 unsigned TypeQuals) { 3280 assert((CopyConstructor->isImplicit() && 3281 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3282 !CopyConstructor->isUsed()) && 3283 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3284 3285 CXXRecordDecl *ClassDecl 3286 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3287 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3288 // C++ [class.copy] p209 3289 // Before the implicitly-declared copy constructor for a class is 3290 // implicitly defined, all the implicitly-declared copy constructors 3291 // for its base class and its non-static data members shall have been 3292 // implicitly defined. 3293 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3294 Base != ClassDecl->bases_end(); ++Base) { 3295 CXXRecordDecl *BaseClassDecl 3296 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3297 if (CXXConstructorDecl *BaseCopyCtor = 3298 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3299 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3300 } 3301 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3302 FieldEnd = ClassDecl->field_end(); 3303 Field != FieldEnd; ++Field) { 3304 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3305 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3306 FieldType = Array->getElementType(); 3307 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3308 CXXRecordDecl *FieldClassDecl 3309 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3310 if (CXXConstructorDecl *FieldCopyCtor = 3311 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3312 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3313 } 3314 } 3315 CopyConstructor->setUsed(); 3316} 3317 3318Sema::OwningExprResult 3319Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3320 CXXConstructorDecl *Constructor, 3321 MultiExprArg ExprArgs) { 3322 bool Elidable = false; 3323 3324 // C++ [class.copy]p15: 3325 // Whenever a temporary class object is copied using a copy constructor, and 3326 // this object and the copy have the same cv-unqualified type, an 3327 // implementation is permitted to treat the original and the copy as two 3328 // different ways of referring to the same object and not perform a copy at 3329 // all, even if the class copy constructor or destructor have side effects. 3330 3331 // FIXME: Is this enough? 3332 if (Constructor->isCopyConstructor(Context)) { 3333 Expr *E = ((Expr **)ExprArgs.get())[0]; 3334 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3335 E = BE->getSubExpr(); 3336 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3337 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3338 E = ICE->getSubExpr(); 3339 3340 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3341 Elidable = true; 3342 } 3343 3344 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3345 Elidable, move(ExprArgs)); 3346} 3347 3348/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3349/// including handling of its default argument expressions. 3350Sema::OwningExprResult 3351Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3352 CXXConstructorDecl *Constructor, bool Elidable, 3353 MultiExprArg ExprArgs) { 3354 unsigned NumExprs = ExprArgs.size(); 3355 Expr **Exprs = (Expr **)ExprArgs.release(); 3356 3357 MarkDeclarationReferenced(ConstructLoc, Constructor); 3358 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3359 Elidable, Exprs, NumExprs)); 3360} 3361 3362Sema::OwningExprResult 3363Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3364 QualType Ty, 3365 SourceLocation TyBeginLoc, 3366 MultiExprArg Args, 3367 SourceLocation RParenLoc) { 3368 unsigned NumExprs = Args.size(); 3369 Expr **Exprs = (Expr **)Args.release(); 3370 3371 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3372 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3373 TyBeginLoc, Exprs, 3374 NumExprs, RParenLoc)); 3375} 3376 3377 3378bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3379 CXXConstructorDecl *Constructor, 3380 MultiExprArg Exprs) { 3381 OwningExprResult TempResult = 3382 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3383 move(Exprs)); 3384 if (TempResult.isInvalid()) 3385 return true; 3386 3387 Expr *Temp = TempResult.takeAs<Expr>(); 3388 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3389 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3390 VD->setInit(Context, Temp); 3391 3392 return false; 3393} 3394 3395void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3396 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3397 DeclInitType->getAs<RecordType>()->getDecl()); 3398 if (!ClassDecl->hasTrivialDestructor()) 3399 if (CXXDestructorDecl *Destructor = 3400 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3401 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3402} 3403 3404/// AddCXXDirectInitializerToDecl - This action is called immediately after 3405/// ActOnDeclarator, when a C++ direct initializer is present. 3406/// e.g: "int x(1);" 3407void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3408 SourceLocation LParenLoc, 3409 MultiExprArg Exprs, 3410 SourceLocation *CommaLocs, 3411 SourceLocation RParenLoc) { 3412 unsigned NumExprs = Exprs.size(); 3413 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3414 Decl *RealDecl = Dcl.getAs<Decl>(); 3415 3416 // If there is no declaration, there was an error parsing it. Just ignore 3417 // the initializer. 3418 if (RealDecl == 0) 3419 return; 3420 3421 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3422 if (!VDecl) { 3423 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3424 RealDecl->setInvalidDecl(); 3425 return; 3426 } 3427 3428 // We will represent direct-initialization similarly to copy-initialization: 3429 // int x(1); -as-> int x = 1; 3430 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3431 // 3432 // Clients that want to distinguish between the two forms, can check for 3433 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3434 // A major benefit is that clients that don't particularly care about which 3435 // exactly form was it (like the CodeGen) can handle both cases without 3436 // special case code. 3437 3438 // If either the declaration has a dependent type or if any of the expressions 3439 // is type-dependent, we represent the initialization via a ParenListExpr for 3440 // later use during template instantiation. 3441 if (VDecl->getType()->isDependentType() || 3442 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3443 // Let clients know that initialization was done with a direct initializer. 3444 VDecl->setCXXDirectInitializer(true); 3445 3446 // Store the initialization expressions as a ParenListExpr. 3447 unsigned NumExprs = Exprs.size(); 3448 VDecl->setInit(Context, 3449 new (Context) ParenListExpr(Context, LParenLoc, 3450 (Expr **)Exprs.release(), 3451 NumExprs, RParenLoc)); 3452 return; 3453 } 3454 3455 3456 // C++ 8.5p11: 3457 // The form of initialization (using parentheses or '=') is generally 3458 // insignificant, but does matter when the entity being initialized has a 3459 // class type. 3460 QualType DeclInitType = VDecl->getType(); 3461 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3462 DeclInitType = Context.getBaseElementType(Array); 3463 3464 // FIXME: This isn't the right place to complete the type. 3465 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3466 diag::err_typecheck_decl_incomplete_type)) { 3467 VDecl->setInvalidDecl(); 3468 return; 3469 } 3470 3471 if (VDecl->getType()->isRecordType()) { 3472 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3473 3474 CXXConstructorDecl *Constructor 3475 = PerformInitializationByConstructor(DeclInitType, 3476 move(Exprs), 3477 VDecl->getLocation(), 3478 SourceRange(VDecl->getLocation(), 3479 RParenLoc), 3480 VDecl->getDeclName(), 3481 IK_Direct, 3482 ConstructorArgs); 3483 if (!Constructor) 3484 RealDecl->setInvalidDecl(); 3485 else { 3486 VDecl->setCXXDirectInitializer(true); 3487 if (InitializeVarWithConstructor(VDecl, Constructor, 3488 move_arg(ConstructorArgs))) 3489 RealDecl->setInvalidDecl(); 3490 FinalizeVarWithDestructor(VDecl, DeclInitType); 3491 } 3492 return; 3493 } 3494 3495 if (NumExprs > 1) { 3496 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3497 << SourceRange(VDecl->getLocation(), RParenLoc); 3498 RealDecl->setInvalidDecl(); 3499 return; 3500 } 3501 3502 // Let clients know that initialization was done with a direct initializer. 3503 VDecl->setCXXDirectInitializer(true); 3504 3505 assert(NumExprs == 1 && "Expected 1 expression"); 3506 // Set the init expression, handles conversions. 3507 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3508 /*DirectInit=*/true); 3509} 3510 3511/// \brief Add the applicable constructor candidates for an initialization 3512/// by constructor. 3513static void AddConstructorInitializationCandidates(Sema &SemaRef, 3514 QualType ClassType, 3515 Expr **Args, 3516 unsigned NumArgs, 3517 Sema::InitializationKind Kind, 3518 OverloadCandidateSet &CandidateSet) { 3519 // C++ [dcl.init]p14: 3520 // If the initialization is direct-initialization, or if it is 3521 // copy-initialization where the cv-unqualified version of the 3522 // source type is the same class as, or a derived class of, the 3523 // class of the destination, constructors are considered. The 3524 // applicable constructors are enumerated (13.3.1.3), and the 3525 // best one is chosen through overload resolution (13.3). The 3526 // constructor so selected is called to initialize the object, 3527 // with the initializer expression(s) as its argument(s). If no 3528 // constructor applies, or the overload resolution is ambiguous, 3529 // the initialization is ill-formed. 3530 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3531 assert(ClassRec && "Can only initialize a class type here"); 3532 3533 // FIXME: When we decide not to synthesize the implicitly-declared 3534 // constructors, we'll need to make them appear here. 3535 3536 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3537 DeclarationName ConstructorName 3538 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3539 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3540 DeclContext::lookup_const_iterator Con, ConEnd; 3541 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3542 Con != ConEnd; ++Con) { 3543 // Find the constructor (which may be a template). 3544 CXXConstructorDecl *Constructor = 0; 3545 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3546 if (ConstructorTmpl) 3547 Constructor 3548 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3549 else 3550 Constructor = cast<CXXConstructorDecl>(*Con); 3551 3552 if ((Kind == Sema::IK_Direct) || 3553 (Kind == Sema::IK_Copy && 3554 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3555 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3556 if (ConstructorTmpl) 3557 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 3558 /*ExplicitArgs*/ 0, 3559 Args, NumArgs, CandidateSet); 3560 else 3561 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3562 } 3563 } 3564} 3565 3566/// \brief Attempt to perform initialization by constructor 3567/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3568/// copy-initialization. 3569/// 3570/// This routine determines whether initialization by constructor is possible, 3571/// but it does not emit any diagnostics in the case where the initialization 3572/// is ill-formed. 3573/// 3574/// \param ClassType the type of the object being initialized, which must have 3575/// class type. 3576/// 3577/// \param Args the arguments provided to initialize the object 3578/// 3579/// \param NumArgs the number of arguments provided to initialize the object 3580/// 3581/// \param Kind the type of initialization being performed 3582/// 3583/// \returns the constructor used to initialize the object, if successful. 3584/// Otherwise, emits a diagnostic and returns NULL. 3585CXXConstructorDecl * 3586Sema::TryInitializationByConstructor(QualType ClassType, 3587 Expr **Args, unsigned NumArgs, 3588 SourceLocation Loc, 3589 InitializationKind Kind) { 3590 // Build the overload candidate set 3591 OverloadCandidateSet CandidateSet; 3592 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3593 CandidateSet); 3594 3595 // Determine whether we found a constructor we can use. 3596 OverloadCandidateSet::iterator Best; 3597 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3598 case OR_Success: 3599 case OR_Deleted: 3600 // We found a constructor. Return it. 3601 return cast<CXXConstructorDecl>(Best->Function); 3602 3603 case OR_No_Viable_Function: 3604 case OR_Ambiguous: 3605 // Overload resolution failed. Return nothing. 3606 return 0; 3607 } 3608 3609 // Silence GCC warning 3610 return 0; 3611} 3612 3613/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3614/// may occur as part of direct-initialization or copy-initialization. 3615/// 3616/// \param ClassType the type of the object being initialized, which must have 3617/// class type. 3618/// 3619/// \param ArgsPtr the arguments provided to initialize the object 3620/// 3621/// \param Loc the source location where the initialization occurs 3622/// 3623/// \param Range the source range that covers the entire initialization 3624/// 3625/// \param InitEntity the name of the entity being initialized, if known 3626/// 3627/// \param Kind the type of initialization being performed 3628/// 3629/// \param ConvertedArgs a vector that will be filled in with the 3630/// appropriately-converted arguments to the constructor (if initialization 3631/// succeeded). 3632/// 3633/// \returns the constructor used to initialize the object, if successful. 3634/// Otherwise, emits a diagnostic and returns NULL. 3635CXXConstructorDecl * 3636Sema::PerformInitializationByConstructor(QualType ClassType, 3637 MultiExprArg ArgsPtr, 3638 SourceLocation Loc, SourceRange Range, 3639 DeclarationName InitEntity, 3640 InitializationKind Kind, 3641 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3642 3643 // Build the overload candidate set 3644 Expr **Args = (Expr **)ArgsPtr.get(); 3645 unsigned NumArgs = ArgsPtr.size(); 3646 OverloadCandidateSet CandidateSet; 3647 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3648 CandidateSet); 3649 3650 OverloadCandidateSet::iterator Best; 3651 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3652 case OR_Success: 3653 // We found a constructor. Break out so that we can convert the arguments 3654 // appropriately. 3655 break; 3656 3657 case OR_No_Viable_Function: 3658 if (InitEntity) 3659 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3660 << InitEntity << Range; 3661 else 3662 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3663 << ClassType << Range; 3664 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3665 return 0; 3666 3667 case OR_Ambiguous: 3668 if (InitEntity) 3669 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3670 else 3671 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3672 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3673 return 0; 3674 3675 case OR_Deleted: 3676 if (InitEntity) 3677 Diag(Loc, diag::err_ovl_deleted_init) 3678 << Best->Function->isDeleted() 3679 << InitEntity << Range; 3680 else { 3681 const CXXRecordDecl *RD = 3682 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 3683 Diag(Loc, diag::err_ovl_deleted_init) 3684 << Best->Function->isDeleted() 3685 << RD->getDeclName() << Range; 3686 } 3687 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3688 return 0; 3689 } 3690 3691 // Convert the arguments, fill in default arguments, etc. 3692 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3693 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3694 return 0; 3695 3696 return Constructor; 3697} 3698 3699/// \brief Given a constructor and the set of arguments provided for the 3700/// constructor, convert the arguments and add any required default arguments 3701/// to form a proper call to this constructor. 3702/// 3703/// \returns true if an error occurred, false otherwise. 3704bool 3705Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3706 MultiExprArg ArgsPtr, 3707 SourceLocation Loc, 3708 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3709 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3710 unsigned NumArgs = ArgsPtr.size(); 3711 Expr **Args = (Expr **)ArgsPtr.get(); 3712 3713 const FunctionProtoType *Proto 3714 = Constructor->getType()->getAs<FunctionProtoType>(); 3715 assert(Proto && "Constructor without a prototype?"); 3716 unsigned NumArgsInProto = Proto->getNumArgs(); 3717 3718 // If too few arguments are available, we'll fill in the rest with defaults. 3719 if (NumArgs < NumArgsInProto) 3720 ConvertedArgs.reserve(NumArgsInProto); 3721 else 3722 ConvertedArgs.reserve(NumArgs); 3723 3724 VariadicCallType CallType = 3725 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 3726 llvm::SmallVector<Expr *, 8> AllArgs; 3727 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 3728 Proto, 0, Args, NumArgs, AllArgs, 3729 CallType); 3730 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 3731 ConvertedArgs.push_back(AllArgs[i]); 3732 return Invalid; 3733} 3734 3735/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3736/// determine whether they are reference-related, 3737/// reference-compatible, reference-compatible with added 3738/// qualification, or incompatible, for use in C++ initialization by 3739/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3740/// type, and the first type (T1) is the pointee type of the reference 3741/// type being initialized. 3742Sema::ReferenceCompareResult 3743Sema::CompareReferenceRelationship(SourceLocation Loc, 3744 QualType OrigT1, QualType OrigT2, 3745 bool& DerivedToBase) { 3746 assert(!OrigT1->isReferenceType() && 3747 "T1 must be the pointee type of the reference type"); 3748 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3749 3750 QualType T1 = Context.getCanonicalType(OrigT1); 3751 QualType T2 = Context.getCanonicalType(OrigT2); 3752 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3753 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3754 3755 // C++ [dcl.init.ref]p4: 3756 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3757 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3758 // T1 is a base class of T2. 3759 if (UnqualT1 == UnqualT2) 3760 DerivedToBase = false; 3761 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3762 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3763 IsDerivedFrom(UnqualT2, UnqualT1)) 3764 DerivedToBase = true; 3765 else 3766 return Ref_Incompatible; 3767 3768 // At this point, we know that T1 and T2 are reference-related (at 3769 // least). 3770 3771 // C++ [dcl.init.ref]p4: 3772 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3773 // reference-related to T2 and cv1 is the same cv-qualification 3774 // as, or greater cv-qualification than, cv2. For purposes of 3775 // overload resolution, cases for which cv1 is greater 3776 // cv-qualification than cv2 are identified as 3777 // reference-compatible with added qualification (see 13.3.3.2). 3778 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3779 return Ref_Compatible; 3780 else if (T1.isMoreQualifiedThan(T2)) 3781 return Ref_Compatible_With_Added_Qualification; 3782 else 3783 return Ref_Related; 3784} 3785 3786/// CheckReferenceInit - Check the initialization of a reference 3787/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3788/// the initializer (either a simple initializer or an initializer 3789/// list), and DeclType is the type of the declaration. When ICS is 3790/// non-null, this routine will compute the implicit conversion 3791/// sequence according to C++ [over.ics.ref] and will not produce any 3792/// diagnostics; when ICS is null, it will emit diagnostics when any 3793/// errors are found. Either way, a return value of true indicates 3794/// that there was a failure, a return value of false indicates that 3795/// the reference initialization succeeded. 3796/// 3797/// When @p SuppressUserConversions, user-defined conversions are 3798/// suppressed. 3799/// When @p AllowExplicit, we also permit explicit user-defined 3800/// conversion functions. 3801/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3802/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3803/// This is used when this is called from a C-style cast. 3804bool 3805Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3806 SourceLocation DeclLoc, 3807 bool SuppressUserConversions, 3808 bool AllowExplicit, bool ForceRValue, 3809 ImplicitConversionSequence *ICS, 3810 bool IgnoreBaseAccess) { 3811 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3812 3813 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3814 QualType T2 = Init->getType(); 3815 3816 // If the initializer is the address of an overloaded function, try 3817 // to resolve the overloaded function. If all goes well, T2 is the 3818 // type of the resulting function. 3819 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3820 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3821 ICS != 0); 3822 if (Fn) { 3823 // Since we're performing this reference-initialization for 3824 // real, update the initializer with the resulting function. 3825 if (!ICS) { 3826 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3827 return true; 3828 3829 Init = FixOverloadedFunctionReference(Init, Fn); 3830 } 3831 3832 T2 = Fn->getType(); 3833 } 3834 } 3835 3836 // Compute some basic properties of the types and the initializer. 3837 bool isRValRef = DeclType->isRValueReferenceType(); 3838 bool DerivedToBase = false; 3839 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3840 Init->isLvalue(Context); 3841 ReferenceCompareResult RefRelationship 3842 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3843 3844 // Most paths end in a failed conversion. 3845 if (ICS) 3846 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3847 3848 // C++ [dcl.init.ref]p5: 3849 // A reference to type "cv1 T1" is initialized by an expression 3850 // of type "cv2 T2" as follows: 3851 3852 // -- If the initializer expression 3853 3854 // Rvalue references cannot bind to lvalues (N2812). 3855 // There is absolutely no situation where they can. In particular, note that 3856 // this is ill-formed, even if B has a user-defined conversion to A&&: 3857 // B b; 3858 // A&& r = b; 3859 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3860 if (!ICS) 3861 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3862 << Init->getSourceRange(); 3863 return true; 3864 } 3865 3866 bool BindsDirectly = false; 3867 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3868 // reference-compatible with "cv2 T2," or 3869 // 3870 // Note that the bit-field check is skipped if we are just computing 3871 // the implicit conversion sequence (C++ [over.best.ics]p2). 3872 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3873 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3874 BindsDirectly = true; 3875 3876 if (ICS) { 3877 // C++ [over.ics.ref]p1: 3878 // When a parameter of reference type binds directly (8.5.3) 3879 // to an argument expression, the implicit conversion sequence 3880 // is the identity conversion, unless the argument expression 3881 // has a type that is a derived class of the parameter type, 3882 // in which case the implicit conversion sequence is a 3883 // derived-to-base Conversion (13.3.3.1). 3884 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3885 ICS->Standard.First = ICK_Identity; 3886 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3887 ICS->Standard.Third = ICK_Identity; 3888 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3889 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3890 ICS->Standard.ReferenceBinding = true; 3891 ICS->Standard.DirectBinding = true; 3892 ICS->Standard.RRefBinding = false; 3893 ICS->Standard.CopyConstructor = 0; 3894 3895 // Nothing more to do: the inaccessibility/ambiguity check for 3896 // derived-to-base conversions is suppressed when we're 3897 // computing the implicit conversion sequence (C++ 3898 // [over.best.ics]p2). 3899 return false; 3900 } else { 3901 // Perform the conversion. 3902 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3903 if (DerivedToBase) 3904 CK = CastExpr::CK_DerivedToBase; 3905 else if(CheckExceptionSpecCompatibility(Init, T1)) 3906 return true; 3907 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3908 } 3909 } 3910 3911 // -- has a class type (i.e., T2 is a class type) and can be 3912 // implicitly converted to an lvalue of type "cv3 T3," 3913 // where "cv1 T1" is reference-compatible with "cv3 T3" 3914 // 92) (this conversion is selected by enumerating the 3915 // applicable conversion functions (13.3.1.6) and choosing 3916 // the best one through overload resolution (13.3)), 3917 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3918 !RequireCompleteType(DeclLoc, T2, 0)) { 3919 CXXRecordDecl *T2RecordDecl 3920 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3921 3922 OverloadCandidateSet CandidateSet; 3923 const UnresolvedSet *Conversions 3924 = T2RecordDecl->getVisibleConversionFunctions(); 3925 for (UnresolvedSet::iterator I = Conversions->begin(), 3926 E = Conversions->end(); I != E; ++I) { 3927 NamedDecl *D = *I; 3928 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 3929 if (isa<UsingShadowDecl>(D)) 3930 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 3931 3932 FunctionTemplateDecl *ConvTemplate 3933 = dyn_cast<FunctionTemplateDecl>(D); 3934 CXXConversionDecl *Conv; 3935 if (ConvTemplate) 3936 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3937 else 3938 Conv = cast<CXXConversionDecl>(D); 3939 3940 // If the conversion function doesn't return a reference type, 3941 // it can't be considered for this conversion. 3942 if (Conv->getConversionType()->isLValueReferenceType() && 3943 (AllowExplicit || !Conv->isExplicit())) { 3944 if (ConvTemplate) 3945 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 3946 Init, DeclType, CandidateSet); 3947 else 3948 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 3949 } 3950 } 3951 3952 OverloadCandidateSet::iterator Best; 3953 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3954 case OR_Success: 3955 // This is a direct binding. 3956 BindsDirectly = true; 3957 3958 if (ICS) { 3959 // C++ [over.ics.ref]p1: 3960 // 3961 // [...] If the parameter binds directly to the result of 3962 // applying a conversion function to the argument 3963 // expression, the implicit conversion sequence is a 3964 // user-defined conversion sequence (13.3.3.1.2), with the 3965 // second standard conversion sequence either an identity 3966 // conversion or, if the conversion function returns an 3967 // entity of a type that is a derived class of the parameter 3968 // type, a derived-to-base Conversion. 3969 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3970 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3971 ICS->UserDefined.After = Best->FinalConversion; 3972 ICS->UserDefined.ConversionFunction = Best->Function; 3973 ICS->UserDefined.EllipsisConversion = false; 3974 assert(ICS->UserDefined.After.ReferenceBinding && 3975 ICS->UserDefined.After.DirectBinding && 3976 "Expected a direct reference binding!"); 3977 return false; 3978 } else { 3979 OwningExprResult InitConversion = 3980 BuildCXXCastArgument(DeclLoc, QualType(), 3981 CastExpr::CK_UserDefinedConversion, 3982 cast<CXXMethodDecl>(Best->Function), 3983 Owned(Init)); 3984 Init = InitConversion.takeAs<Expr>(); 3985 3986 if (CheckExceptionSpecCompatibility(Init, T1)) 3987 return true; 3988 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3989 /*isLvalue=*/true); 3990 } 3991 break; 3992 3993 case OR_Ambiguous: 3994 if (ICS) { 3995 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3996 Cand != CandidateSet.end(); ++Cand) 3997 if (Cand->Viable) 3998 ICS->ConversionFunctionSet.push_back(Cand->Function); 3999 break; 4000 } 4001 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4002 << Init->getSourceRange(); 4003 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4004 return true; 4005 4006 case OR_No_Viable_Function: 4007 case OR_Deleted: 4008 // There was no suitable conversion, or we found a deleted 4009 // conversion; continue with other checks. 4010 break; 4011 } 4012 } 4013 4014 if (BindsDirectly) { 4015 // C++ [dcl.init.ref]p4: 4016 // [...] In all cases where the reference-related or 4017 // reference-compatible relationship of two types is used to 4018 // establish the validity of a reference binding, and T1 is a 4019 // base class of T2, a program that necessitates such a binding 4020 // is ill-formed if T1 is an inaccessible (clause 11) or 4021 // ambiguous (10.2) base class of T2. 4022 // 4023 // Note that we only check this condition when we're allowed to 4024 // complain about errors, because we should not be checking for 4025 // ambiguity (or inaccessibility) unless the reference binding 4026 // actually happens. 4027 if (DerivedToBase) 4028 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4029 Init->getSourceRange(), 4030 IgnoreBaseAccess); 4031 else 4032 return false; 4033 } 4034 4035 // -- Otherwise, the reference shall be to a non-volatile const 4036 // type (i.e., cv1 shall be const), or the reference shall be an 4037 // rvalue reference and the initializer expression shall be an rvalue. 4038 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4039 if (!ICS) 4040 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4041 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4042 << T2 << Init->getSourceRange(); 4043 return true; 4044 } 4045 4046 // -- If the initializer expression is an rvalue, with T2 a 4047 // class type, and "cv1 T1" is reference-compatible with 4048 // "cv2 T2," the reference is bound in one of the 4049 // following ways (the choice is implementation-defined): 4050 // 4051 // -- The reference is bound to the object represented by 4052 // the rvalue (see 3.10) or to a sub-object within that 4053 // object. 4054 // 4055 // -- A temporary of type "cv1 T2" [sic] is created, and 4056 // a constructor is called to copy the entire rvalue 4057 // object into the temporary. The reference is bound to 4058 // the temporary or to a sub-object within the 4059 // temporary. 4060 // 4061 // The constructor that would be used to make the copy 4062 // shall be callable whether or not the copy is actually 4063 // done. 4064 // 4065 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4066 // freedom, so we will always take the first option and never build 4067 // a temporary in this case. FIXME: We will, however, have to check 4068 // for the presence of a copy constructor in C++98/03 mode. 4069 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4070 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4071 if (ICS) { 4072 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4073 ICS->Standard.First = ICK_Identity; 4074 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4075 ICS->Standard.Third = ICK_Identity; 4076 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4077 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4078 ICS->Standard.ReferenceBinding = true; 4079 ICS->Standard.DirectBinding = false; 4080 ICS->Standard.RRefBinding = isRValRef; 4081 ICS->Standard.CopyConstructor = 0; 4082 } else { 4083 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4084 if (DerivedToBase) 4085 CK = CastExpr::CK_DerivedToBase; 4086 else if(CheckExceptionSpecCompatibility(Init, T1)) 4087 return true; 4088 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4089 } 4090 return false; 4091 } 4092 4093 // -- Otherwise, a temporary of type "cv1 T1" is created and 4094 // initialized from the initializer expression using the 4095 // rules for a non-reference copy initialization (8.5). The 4096 // reference is then bound to the temporary. If T1 is 4097 // reference-related to T2, cv1 must be the same 4098 // cv-qualification as, or greater cv-qualification than, 4099 // cv2; otherwise, the program is ill-formed. 4100 if (RefRelationship == Ref_Related) { 4101 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4102 // we would be reference-compatible or reference-compatible with 4103 // added qualification. But that wasn't the case, so the reference 4104 // initialization fails. 4105 if (!ICS) 4106 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4107 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4108 << T2 << Init->getSourceRange(); 4109 return true; 4110 } 4111 4112 // If at least one of the types is a class type, the types are not 4113 // related, and we aren't allowed any user conversions, the 4114 // reference binding fails. This case is important for breaking 4115 // recursion, since TryImplicitConversion below will attempt to 4116 // create a temporary through the use of a copy constructor. 4117 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4118 (T1->isRecordType() || T2->isRecordType())) { 4119 if (!ICS) 4120 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4121 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4122 return true; 4123 } 4124 4125 // Actually try to convert the initializer to T1. 4126 if (ICS) { 4127 // C++ [over.ics.ref]p2: 4128 // 4129 // When a parameter of reference type is not bound directly to 4130 // an argument expression, the conversion sequence is the one 4131 // required to convert the argument expression to the 4132 // underlying type of the reference according to 4133 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4134 // to copy-initializing a temporary of the underlying type with 4135 // the argument expression. Any difference in top-level 4136 // cv-qualification is subsumed by the initialization itself 4137 // and does not constitute a conversion. 4138 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4139 /*AllowExplicit=*/false, 4140 /*ForceRValue=*/false, 4141 /*InOverloadResolution=*/false); 4142 4143 // Of course, that's still a reference binding. 4144 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4145 ICS->Standard.ReferenceBinding = true; 4146 ICS->Standard.RRefBinding = isRValRef; 4147 } else if (ICS->ConversionKind == 4148 ImplicitConversionSequence::UserDefinedConversion) { 4149 ICS->UserDefined.After.ReferenceBinding = true; 4150 ICS->UserDefined.After.RRefBinding = isRValRef; 4151 } 4152 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4153 } else { 4154 ImplicitConversionSequence Conversions; 4155 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4156 false, false, 4157 Conversions); 4158 if (badConversion) { 4159 if ((Conversions.ConversionKind == 4160 ImplicitConversionSequence::BadConversion) 4161 && !Conversions.ConversionFunctionSet.empty()) { 4162 Diag(DeclLoc, 4163 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4164 for (int j = Conversions.ConversionFunctionSet.size()-1; 4165 j >= 0; j--) { 4166 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4167 Diag(Func->getLocation(), diag::err_ovl_candidate); 4168 } 4169 } 4170 else { 4171 if (isRValRef) 4172 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4173 << Init->getSourceRange(); 4174 else 4175 Diag(DeclLoc, diag::err_invalid_initialization) 4176 << DeclType << Init->getType() << Init->getSourceRange(); 4177 } 4178 } 4179 return badConversion; 4180 } 4181} 4182 4183/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4184/// of this overloaded operator is well-formed. If so, returns false; 4185/// otherwise, emits appropriate diagnostics and returns true. 4186bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4187 assert(FnDecl && FnDecl->isOverloadedOperator() && 4188 "Expected an overloaded operator declaration"); 4189 4190 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4191 4192 // C++ [over.oper]p5: 4193 // The allocation and deallocation functions, operator new, 4194 // operator new[], operator delete and operator delete[], are 4195 // described completely in 3.7.3. The attributes and restrictions 4196 // found in the rest of this subclause do not apply to them unless 4197 // explicitly stated in 3.7.3. 4198 // FIXME: Write a separate routine for checking this. For now, just allow it. 4199 if (Op == OO_Delete || Op == OO_Array_Delete) 4200 return false; 4201 4202 if (Op == OO_New || Op == OO_Array_New) { 4203 bool ret = false; 4204 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4205 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4206 QualType T = Context.getCanonicalType((*Param)->getType()); 4207 if (!T->isDependentType() && SizeTy != T) { 4208 Diag(FnDecl->getLocation(), 4209 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4210 << SizeTy; 4211 ret = true; 4212 } 4213 } 4214 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4215 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4216 return Diag(FnDecl->getLocation(), 4217 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4218 << static_cast<QualType>(Context.VoidPtrTy); 4219 return ret; 4220 } 4221 4222 // C++ [over.oper]p6: 4223 // An operator function shall either be a non-static member 4224 // function or be a non-member function and have at least one 4225 // parameter whose type is a class, a reference to a class, an 4226 // enumeration, or a reference to an enumeration. 4227 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4228 if (MethodDecl->isStatic()) 4229 return Diag(FnDecl->getLocation(), 4230 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4231 } else { 4232 bool ClassOrEnumParam = false; 4233 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4234 ParamEnd = FnDecl->param_end(); 4235 Param != ParamEnd; ++Param) { 4236 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4237 if (ParamType->isDependentType() || ParamType->isRecordType() || 4238 ParamType->isEnumeralType()) { 4239 ClassOrEnumParam = true; 4240 break; 4241 } 4242 } 4243 4244 if (!ClassOrEnumParam) 4245 return Diag(FnDecl->getLocation(), 4246 diag::err_operator_overload_needs_class_or_enum) 4247 << FnDecl->getDeclName(); 4248 } 4249 4250 // C++ [over.oper]p8: 4251 // An operator function cannot have default arguments (8.3.6), 4252 // except where explicitly stated below. 4253 // 4254 // Only the function-call operator allows default arguments 4255 // (C++ [over.call]p1). 4256 if (Op != OO_Call) { 4257 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4258 Param != FnDecl->param_end(); ++Param) { 4259 if ((*Param)->hasUnparsedDefaultArg()) 4260 return Diag((*Param)->getLocation(), 4261 diag::err_operator_overload_default_arg) 4262 << FnDecl->getDeclName(); 4263 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4264 return Diag((*Param)->getLocation(), 4265 diag::err_operator_overload_default_arg) 4266 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4267 } 4268 } 4269 4270 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4271 { false, false, false } 4272#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4273 , { Unary, Binary, MemberOnly } 4274#include "clang/Basic/OperatorKinds.def" 4275 }; 4276 4277 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4278 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4279 bool MustBeMemberOperator = OperatorUses[Op][2]; 4280 4281 // C++ [over.oper]p8: 4282 // [...] Operator functions cannot have more or fewer parameters 4283 // than the number required for the corresponding operator, as 4284 // described in the rest of this subclause. 4285 unsigned NumParams = FnDecl->getNumParams() 4286 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4287 if (Op != OO_Call && 4288 ((NumParams == 1 && !CanBeUnaryOperator) || 4289 (NumParams == 2 && !CanBeBinaryOperator) || 4290 (NumParams < 1) || (NumParams > 2))) { 4291 // We have the wrong number of parameters. 4292 unsigned ErrorKind; 4293 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4294 ErrorKind = 2; // 2 -> unary or binary. 4295 } else if (CanBeUnaryOperator) { 4296 ErrorKind = 0; // 0 -> unary 4297 } else { 4298 assert(CanBeBinaryOperator && 4299 "All non-call overloaded operators are unary or binary!"); 4300 ErrorKind = 1; // 1 -> binary 4301 } 4302 4303 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4304 << FnDecl->getDeclName() << NumParams << ErrorKind; 4305 } 4306 4307 // Overloaded operators other than operator() cannot be variadic. 4308 if (Op != OO_Call && 4309 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4310 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4311 << FnDecl->getDeclName(); 4312 } 4313 4314 // Some operators must be non-static member functions. 4315 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4316 return Diag(FnDecl->getLocation(), 4317 diag::err_operator_overload_must_be_member) 4318 << FnDecl->getDeclName(); 4319 } 4320 4321 // C++ [over.inc]p1: 4322 // The user-defined function called operator++ implements the 4323 // prefix and postfix ++ operator. If this function is a member 4324 // function with no parameters, or a non-member function with one 4325 // parameter of class or enumeration type, it defines the prefix 4326 // increment operator ++ for objects of that type. If the function 4327 // is a member function with one parameter (which shall be of type 4328 // int) or a non-member function with two parameters (the second 4329 // of which shall be of type int), it defines the postfix 4330 // increment operator ++ for objects of that type. 4331 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4332 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4333 bool ParamIsInt = false; 4334 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4335 ParamIsInt = BT->getKind() == BuiltinType::Int; 4336 4337 if (!ParamIsInt) 4338 return Diag(LastParam->getLocation(), 4339 diag::err_operator_overload_post_incdec_must_be_int) 4340 << LastParam->getType() << (Op == OO_MinusMinus); 4341 } 4342 4343 // Notify the class if it got an assignment operator. 4344 if (Op == OO_Equal) { 4345 // Would have returned earlier otherwise. 4346 assert(isa<CXXMethodDecl>(FnDecl) && 4347 "Overloaded = not member, but not filtered."); 4348 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4349 Method->getParent()->addedAssignmentOperator(Context, Method); 4350 } 4351 4352 return false; 4353} 4354 4355/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4356/// linkage specification, including the language and (if present) 4357/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4358/// the location of the language string literal, which is provided 4359/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4360/// the '{' brace. Otherwise, this linkage specification does not 4361/// have any braces. 4362Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4363 SourceLocation ExternLoc, 4364 SourceLocation LangLoc, 4365 const char *Lang, 4366 unsigned StrSize, 4367 SourceLocation LBraceLoc) { 4368 LinkageSpecDecl::LanguageIDs Language; 4369 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4370 Language = LinkageSpecDecl::lang_c; 4371 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4372 Language = LinkageSpecDecl::lang_cxx; 4373 else { 4374 Diag(LangLoc, diag::err_bad_language); 4375 return DeclPtrTy(); 4376 } 4377 4378 // FIXME: Add all the various semantics of linkage specifications 4379 4380 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4381 LangLoc, Language, 4382 LBraceLoc.isValid()); 4383 CurContext->addDecl(D); 4384 PushDeclContext(S, D); 4385 return DeclPtrTy::make(D); 4386} 4387 4388/// ActOnFinishLinkageSpecification - Completely the definition of 4389/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4390/// valid, it's the position of the closing '}' brace in a linkage 4391/// specification that uses braces. 4392Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4393 DeclPtrTy LinkageSpec, 4394 SourceLocation RBraceLoc) { 4395 if (LinkageSpec) 4396 PopDeclContext(); 4397 return LinkageSpec; 4398} 4399 4400/// \brief Perform semantic analysis for the variable declaration that 4401/// occurs within a C++ catch clause, returning the newly-created 4402/// variable. 4403VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4404 DeclaratorInfo *DInfo, 4405 IdentifierInfo *Name, 4406 SourceLocation Loc, 4407 SourceRange Range) { 4408 bool Invalid = false; 4409 4410 // Arrays and functions decay. 4411 if (ExDeclType->isArrayType()) 4412 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4413 else if (ExDeclType->isFunctionType()) 4414 ExDeclType = Context.getPointerType(ExDeclType); 4415 4416 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4417 // The exception-declaration shall not denote a pointer or reference to an 4418 // incomplete type, other than [cv] void*. 4419 // N2844 forbids rvalue references. 4420 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4421 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4422 Invalid = true; 4423 } 4424 4425 QualType BaseType = ExDeclType; 4426 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4427 unsigned DK = diag::err_catch_incomplete; 4428 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4429 BaseType = Ptr->getPointeeType(); 4430 Mode = 1; 4431 DK = diag::err_catch_incomplete_ptr; 4432 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4433 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4434 BaseType = Ref->getPointeeType(); 4435 Mode = 2; 4436 DK = diag::err_catch_incomplete_ref; 4437 } 4438 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4439 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4440 Invalid = true; 4441 4442 if (!Invalid && !ExDeclType->isDependentType() && 4443 RequireNonAbstractType(Loc, ExDeclType, 4444 diag::err_abstract_type_in_decl, 4445 AbstractVariableType)) 4446 Invalid = true; 4447 4448 // FIXME: Need to test for ability to copy-construct and destroy the 4449 // exception variable. 4450 4451 // FIXME: Need to check for abstract classes. 4452 4453 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4454 Name, ExDeclType, DInfo, VarDecl::None); 4455 4456 if (Invalid) 4457 ExDecl->setInvalidDecl(); 4458 4459 return ExDecl; 4460} 4461 4462/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4463/// handler. 4464Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4465 DeclaratorInfo *DInfo = 0; 4466 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4467 4468 bool Invalid = D.isInvalidType(); 4469 IdentifierInfo *II = D.getIdentifier(); 4470 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4471 // The scope should be freshly made just for us. There is just no way 4472 // it contains any previous declaration. 4473 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4474 if (PrevDecl->isTemplateParameter()) { 4475 // Maybe we will complain about the shadowed template parameter. 4476 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4477 } 4478 } 4479 4480 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4481 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4482 << D.getCXXScopeSpec().getRange(); 4483 Invalid = true; 4484 } 4485 4486 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4487 D.getIdentifier(), 4488 D.getIdentifierLoc(), 4489 D.getDeclSpec().getSourceRange()); 4490 4491 if (Invalid) 4492 ExDecl->setInvalidDecl(); 4493 4494 // Add the exception declaration into this scope. 4495 if (II) 4496 PushOnScopeChains(ExDecl, S); 4497 else 4498 CurContext->addDecl(ExDecl); 4499 4500 ProcessDeclAttributes(S, ExDecl, D); 4501 return DeclPtrTy::make(ExDecl); 4502} 4503 4504Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4505 ExprArg assertexpr, 4506 ExprArg assertmessageexpr) { 4507 Expr *AssertExpr = (Expr *)assertexpr.get(); 4508 StringLiteral *AssertMessage = 4509 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4510 4511 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4512 llvm::APSInt Value(32); 4513 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4514 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4515 AssertExpr->getSourceRange(); 4516 return DeclPtrTy(); 4517 } 4518 4519 if (Value == 0) { 4520 std::string str(AssertMessage->getStrData(), 4521 AssertMessage->getByteLength()); 4522 Diag(AssertLoc, diag::err_static_assert_failed) 4523 << str << AssertExpr->getSourceRange(); 4524 } 4525 } 4526 4527 assertexpr.release(); 4528 assertmessageexpr.release(); 4529 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4530 AssertExpr, AssertMessage); 4531 4532 CurContext->addDecl(Decl); 4533 return DeclPtrTy::make(Decl); 4534} 4535 4536/// Handle a friend type declaration. This works in tandem with 4537/// ActOnTag. 4538/// 4539/// Notes on friend class templates: 4540/// 4541/// We generally treat friend class declarations as if they were 4542/// declaring a class. So, for example, the elaborated type specifier 4543/// in a friend declaration is required to obey the restrictions of a 4544/// class-head (i.e. no typedefs in the scope chain), template 4545/// parameters are required to match up with simple template-ids, &c. 4546/// However, unlike when declaring a template specialization, it's 4547/// okay to refer to a template specialization without an empty 4548/// template parameter declaration, e.g. 4549/// friend class A<T>::B<unsigned>; 4550/// We permit this as a special case; if there are any template 4551/// parameters present at all, require proper matching, i.e. 4552/// template <> template <class T> friend class A<int>::B; 4553Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4554 MultiTemplateParamsArg TempParams) { 4555 SourceLocation Loc = DS.getSourceRange().getBegin(); 4556 4557 assert(DS.isFriendSpecified()); 4558 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4559 4560 // Try to convert the decl specifier to a type. This works for 4561 // friend templates because ActOnTag never produces a ClassTemplateDecl 4562 // for a TUK_Friend. 4563 Declarator TheDeclarator(DS, Declarator::MemberContext); 4564 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4565 if (TheDeclarator.isInvalidType()) 4566 return DeclPtrTy(); 4567 4568 // This is definitely an error in C++98. It's probably meant to 4569 // be forbidden in C++0x, too, but the specification is just 4570 // poorly written. 4571 // 4572 // The problem is with declarations like the following: 4573 // template <T> friend A<T>::foo; 4574 // where deciding whether a class C is a friend or not now hinges 4575 // on whether there exists an instantiation of A that causes 4576 // 'foo' to equal C. There are restrictions on class-heads 4577 // (which we declare (by fiat) elaborated friend declarations to 4578 // be) that makes this tractable. 4579 // 4580 // FIXME: handle "template <> friend class A<T>;", which 4581 // is possibly well-formed? Who even knows? 4582 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4583 Diag(Loc, diag::err_tagless_friend_type_template) 4584 << DS.getSourceRange(); 4585 return DeclPtrTy(); 4586 } 4587 4588 // C++ [class.friend]p2: 4589 // An elaborated-type-specifier shall be used in a friend declaration 4590 // for a class.* 4591 // * The class-key of the elaborated-type-specifier is required. 4592 // This is one of the rare places in Clang where it's legitimate to 4593 // ask about the "spelling" of the type. 4594 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4595 // If we evaluated the type to a record type, suggest putting 4596 // a tag in front. 4597 if (const RecordType *RT = T->getAs<RecordType>()) { 4598 RecordDecl *RD = RT->getDecl(); 4599 4600 std::string InsertionText = std::string(" ") + RD->getKindName(); 4601 4602 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4603 << (unsigned) RD->getTagKind() 4604 << T 4605 << SourceRange(DS.getFriendSpecLoc()) 4606 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4607 InsertionText); 4608 return DeclPtrTy(); 4609 }else { 4610 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4611 << DS.getSourceRange(); 4612 return DeclPtrTy(); 4613 } 4614 } 4615 4616 // Enum types cannot be friends. 4617 if (T->getAs<EnumType>()) { 4618 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4619 << SourceRange(DS.getFriendSpecLoc()); 4620 return DeclPtrTy(); 4621 } 4622 4623 // C++98 [class.friend]p1: A friend of a class is a function 4624 // or class that is not a member of the class . . . 4625 // But that's a silly restriction which nobody implements for 4626 // inner classes, and C++0x removes it anyway, so we only report 4627 // this (as a warning) if we're being pedantic. 4628 if (!getLangOptions().CPlusPlus0x) 4629 if (const RecordType *RT = T->getAs<RecordType>()) 4630 if (RT->getDecl()->getDeclContext() == CurContext) 4631 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4632 4633 Decl *D; 4634 if (TempParams.size()) 4635 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4636 TempParams.size(), 4637 (TemplateParameterList**) TempParams.release(), 4638 T.getTypePtr(), 4639 DS.getFriendSpecLoc()); 4640 else 4641 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4642 DS.getFriendSpecLoc()); 4643 D->setAccess(AS_public); 4644 CurContext->addDecl(D); 4645 4646 return DeclPtrTy::make(D); 4647} 4648 4649Sema::DeclPtrTy 4650Sema::ActOnFriendFunctionDecl(Scope *S, 4651 Declarator &D, 4652 bool IsDefinition, 4653 MultiTemplateParamsArg TemplateParams) { 4654 const DeclSpec &DS = D.getDeclSpec(); 4655 4656 assert(DS.isFriendSpecified()); 4657 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4658 4659 SourceLocation Loc = D.getIdentifierLoc(); 4660 DeclaratorInfo *DInfo = 0; 4661 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4662 4663 // C++ [class.friend]p1 4664 // A friend of a class is a function or class.... 4665 // Note that this sees through typedefs, which is intended. 4666 // It *doesn't* see through dependent types, which is correct 4667 // according to [temp.arg.type]p3: 4668 // If a declaration acquires a function type through a 4669 // type dependent on a template-parameter and this causes 4670 // a declaration that does not use the syntactic form of a 4671 // function declarator to have a function type, the program 4672 // is ill-formed. 4673 if (!T->isFunctionType()) { 4674 Diag(Loc, diag::err_unexpected_friend); 4675 4676 // It might be worthwhile to try to recover by creating an 4677 // appropriate declaration. 4678 return DeclPtrTy(); 4679 } 4680 4681 // C++ [namespace.memdef]p3 4682 // - If a friend declaration in a non-local class first declares a 4683 // class or function, the friend class or function is a member 4684 // of the innermost enclosing namespace. 4685 // - The name of the friend is not found by simple name lookup 4686 // until a matching declaration is provided in that namespace 4687 // scope (either before or after the class declaration granting 4688 // friendship). 4689 // - If a friend function is called, its name may be found by the 4690 // name lookup that considers functions from namespaces and 4691 // classes associated with the types of the function arguments. 4692 // - When looking for a prior declaration of a class or a function 4693 // declared as a friend, scopes outside the innermost enclosing 4694 // namespace scope are not considered. 4695 4696 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4697 DeclarationName Name = GetNameForDeclarator(D); 4698 assert(Name); 4699 4700 // The context we found the declaration in, or in which we should 4701 // create the declaration. 4702 DeclContext *DC; 4703 4704 // FIXME: handle local classes 4705 4706 // Recover from invalid scope qualifiers as if they just weren't there. 4707 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 4708 ForRedeclaration); 4709 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4710 // FIXME: RequireCompleteDeclContext 4711 DC = computeDeclContext(ScopeQual); 4712 4713 // FIXME: handle dependent contexts 4714 if (!DC) return DeclPtrTy(); 4715 4716 LookupQualifiedName(Previous, DC); 4717 4718 // If searching in that context implicitly found a declaration in 4719 // a different context, treat it like it wasn't found at all. 4720 // TODO: better diagnostics for this case. Suggesting the right 4721 // qualified scope would be nice... 4722 // FIXME: getRepresentativeDecl() is not right here at all 4723 if (Previous.empty() || 4724 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 4725 D.setInvalidType(); 4726 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4727 return DeclPtrTy(); 4728 } 4729 4730 // C++ [class.friend]p1: A friend of a class is a function or 4731 // class that is not a member of the class . . . 4732 if (DC->Equals(CurContext)) 4733 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4734 4735 // Otherwise walk out to the nearest namespace scope looking for matches. 4736 } else { 4737 // TODO: handle local class contexts. 4738 4739 DC = CurContext; 4740 while (true) { 4741 // Skip class contexts. If someone can cite chapter and verse 4742 // for this behavior, that would be nice --- it's what GCC and 4743 // EDG do, and it seems like a reasonable intent, but the spec 4744 // really only says that checks for unqualified existing 4745 // declarations should stop at the nearest enclosing namespace, 4746 // not that they should only consider the nearest enclosing 4747 // namespace. 4748 while (DC->isRecord()) 4749 DC = DC->getParent(); 4750 4751 LookupQualifiedName(Previous, DC); 4752 4753 // TODO: decide what we think about using declarations. 4754 if (!Previous.empty()) 4755 break; 4756 4757 if (DC->isFileContext()) break; 4758 DC = DC->getParent(); 4759 } 4760 4761 // C++ [class.friend]p1: A friend of a class is a function or 4762 // class that is not a member of the class . . . 4763 // C++0x changes this for both friend types and functions. 4764 // Most C++ 98 compilers do seem to give an error here, so 4765 // we do, too. 4766 if (!Previous.empty() && DC->Equals(CurContext) 4767 && !getLangOptions().CPlusPlus0x) 4768 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4769 } 4770 4771 if (DC->isFileContext()) { 4772 // This implies that it has to be an operator or function. 4773 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4774 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4775 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4776 Diag(Loc, diag::err_introducing_special_friend) << 4777 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4778 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4779 return DeclPtrTy(); 4780 } 4781 } 4782 4783 bool Redeclaration = false; 4784 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, Previous, 4785 move(TemplateParams), 4786 IsDefinition, 4787 Redeclaration); 4788 if (!ND) return DeclPtrTy(); 4789 4790 assert(ND->getDeclContext() == DC); 4791 assert(ND->getLexicalDeclContext() == CurContext); 4792 4793 // Add the function declaration to the appropriate lookup tables, 4794 // adjusting the redeclarations list as necessary. We don't 4795 // want to do this yet if the friending class is dependent. 4796 // 4797 // Also update the scope-based lookup if the target context's 4798 // lookup context is in lexical scope. 4799 if (!CurContext->isDependentContext()) { 4800 DC = DC->getLookupContext(); 4801 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4802 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4803 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4804 } 4805 4806 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4807 D.getIdentifierLoc(), ND, 4808 DS.getFriendSpecLoc()); 4809 FrD->setAccess(AS_public); 4810 CurContext->addDecl(FrD); 4811 4812 return DeclPtrTy::make(ND); 4813} 4814 4815void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4816 AdjustDeclIfTemplate(dcl); 4817 4818 Decl *Dcl = dcl.getAs<Decl>(); 4819 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4820 if (!Fn) { 4821 Diag(DelLoc, diag::err_deleted_non_function); 4822 return; 4823 } 4824 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4825 Diag(DelLoc, diag::err_deleted_decl_not_first); 4826 Diag(Prev->getLocation(), diag::note_previous_declaration); 4827 // If the declaration wasn't the first, we delete the function anyway for 4828 // recovery. 4829 } 4830 Fn->setDeleted(); 4831} 4832 4833static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4834 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4835 ++CI) { 4836 Stmt *SubStmt = *CI; 4837 if (!SubStmt) 4838 continue; 4839 if (isa<ReturnStmt>(SubStmt)) 4840 Self.Diag(SubStmt->getSourceRange().getBegin(), 4841 diag::err_return_in_constructor_handler); 4842 if (!isa<Expr>(SubStmt)) 4843 SearchForReturnInStmt(Self, SubStmt); 4844 } 4845} 4846 4847void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4848 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4849 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4850 SearchForReturnInStmt(*this, Handler); 4851 } 4852} 4853 4854bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4855 const CXXMethodDecl *Old) { 4856 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4857 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4858 4859 QualType CNewTy = Context.getCanonicalType(NewTy); 4860 QualType COldTy = Context.getCanonicalType(OldTy); 4861 4862 if (CNewTy == COldTy && 4863 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4864 return false; 4865 4866 // Check if the return types are covariant 4867 QualType NewClassTy, OldClassTy; 4868 4869 /// Both types must be pointers or references to classes. 4870 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4871 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4872 NewClassTy = NewPT->getPointeeType(); 4873 OldClassTy = OldPT->getPointeeType(); 4874 } 4875 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4876 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4877 NewClassTy = NewRT->getPointeeType(); 4878 OldClassTy = OldRT->getPointeeType(); 4879 } 4880 } 4881 4882 // The return types aren't either both pointers or references to a class type. 4883 if (NewClassTy.isNull()) { 4884 Diag(New->getLocation(), 4885 diag::err_different_return_type_for_overriding_virtual_function) 4886 << New->getDeclName() << NewTy << OldTy; 4887 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4888 4889 return true; 4890 } 4891 4892 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4893 // Check if the new class derives from the old class. 4894 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4895 Diag(New->getLocation(), 4896 diag::err_covariant_return_not_derived) 4897 << New->getDeclName() << NewTy << OldTy; 4898 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4899 return true; 4900 } 4901 4902 // Check if we the conversion from derived to base is valid. 4903 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4904 diag::err_covariant_return_inaccessible_base, 4905 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4906 // FIXME: Should this point to the return type? 4907 New->getLocation(), SourceRange(), New->getDeclName())) { 4908 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4909 return true; 4910 } 4911 } 4912 4913 // The qualifiers of the return types must be the same. 4914 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4915 Diag(New->getLocation(), 4916 diag::err_covariant_return_type_different_qualifications) 4917 << New->getDeclName() << NewTy << OldTy; 4918 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4919 return true; 4920 }; 4921 4922 4923 // The new class type must have the same or less qualifiers as the old type. 4924 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4925 Diag(New->getLocation(), 4926 diag::err_covariant_return_type_class_type_more_qualified) 4927 << New->getDeclName() << NewTy << OldTy; 4928 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4929 return true; 4930 }; 4931 4932 return false; 4933} 4934 4935bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 4936 const CXXMethodDecl *Old) 4937{ 4938 if (Old->hasAttr<FinalAttr>()) { 4939 Diag(New->getLocation(), diag::err_final_function_overridden) 4940 << New->getDeclName(); 4941 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4942 return true; 4943 } 4944 4945 return false; 4946} 4947 4948/// \brief Mark the given method pure. 4949/// 4950/// \param Method the method to be marked pure. 4951/// 4952/// \param InitRange the source range that covers the "0" initializer. 4953bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 4954 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 4955 Method->setPure(); 4956 4957 // A class is abstract if at least one function is pure virtual. 4958 Method->getParent()->setAbstract(true); 4959 return false; 4960 } 4961 4962 if (!Method->isInvalidDecl()) 4963 Diag(Method->getLocation(), diag::err_non_virtual_pure) 4964 << Method->getDeclName() << InitRange; 4965 return true; 4966} 4967 4968/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4969/// initializer for the declaration 'Dcl'. 4970/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4971/// static data member of class X, names should be looked up in the scope of 4972/// class X. 4973void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4974 AdjustDeclIfTemplate(Dcl); 4975 4976 Decl *D = Dcl.getAs<Decl>(); 4977 // If there is no declaration, there was an error parsing it. 4978 if (D == 0) 4979 return; 4980 4981 // Check whether it is a declaration with a nested name specifier like 4982 // int foo::bar; 4983 if (!D->isOutOfLine()) 4984 return; 4985 4986 // C++ [basic.lookup.unqual]p13 4987 // 4988 // A name used in the definition of a static data member of class X 4989 // (after the qualified-id of the static member) is looked up as if the name 4990 // was used in a member function of X. 4991 4992 // Change current context into the context of the initializing declaration. 4993 EnterDeclaratorContext(S, D->getDeclContext()); 4994} 4995 4996/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4997/// initializer for the declaration 'Dcl'. 4998void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4999 AdjustDeclIfTemplate(Dcl); 5000 5001 Decl *D = Dcl.getAs<Decl>(); 5002 // If there is no declaration, there was an error parsing it. 5003 if (D == 0) 5004 return; 5005 5006 // Check whether it is a declaration with a nested name specifier like 5007 // int foo::bar; 5008 if (!D->isOutOfLine()) 5009 return; 5010 5011 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 5012 ExitDeclaratorContext(S); 5013} 5014 5015/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5016/// C++ if/switch/while/for statement. 5017/// e.g: "if (int x = f()) {...}" 5018Action::DeclResult 5019Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5020 // C++ 6.4p2: 5021 // The declarator shall not specify a function or an array. 5022 // The type-specifier-seq shall not contain typedef and shall not declare a 5023 // new class or enumeration. 5024 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5025 "Parser allowed 'typedef' as storage class of condition decl."); 5026 5027 DeclaratorInfo *DInfo = 0; 5028 TagDecl *OwnedTag = 0; 5029 QualType Ty = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag); 5030 5031 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5032 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5033 // would be created and CXXConditionDeclExpr wants a VarDecl. 5034 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5035 << D.getSourceRange(); 5036 return DeclResult(); 5037 } else if (OwnedTag && OwnedTag->isDefinition()) { 5038 // The type-specifier-seq shall not declare a new class or enumeration. 5039 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5040 } 5041 5042 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5043 if (!Dcl) 5044 return DeclResult(); 5045 5046 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5047 VD->setDeclaredInCondition(true); 5048 return Dcl; 5049} 5050 5051void Sema::MaybeMarkVirtualImplicitMembersReferenced(SourceLocation Loc, 5052 CXXMethodDecl *MD) { 5053 // Ignore dependent types. 5054 if (MD->isDependentContext()) 5055 return; 5056 5057 CXXRecordDecl *RD = MD->getParent(); 5058 const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 5059 const CXXMethodDecl *KeyFunction = Layout.getKeyFunction(); 5060 5061 if (!KeyFunction) { 5062 // This record does not have a key function, so we assume that the vtable 5063 // will be emitted when it's used by the constructor. 5064 if (!isa<CXXConstructorDecl>(MD)) 5065 return; 5066 } else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) { 5067 // We don't have the right key function. 5068 return; 5069 } 5070 5071 if (CXXDestructorDecl *Dtor = RD->getDestructor(Context)) { 5072 if (Dtor->isImplicit() && Dtor->isVirtual()) 5073 MarkDeclarationReferenced(Loc, Dtor); 5074 } 5075 5076 // FIXME: Need to handle the virtual assignment operator here too. 5077} 5078