SemaDeclCXX.cpp revision 198893
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 "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/CXXInheritance.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Basic/PartialDiagnostic.h" 22#include "clang/Lex/Preprocessor.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/STLExtras.h" 25#include "llvm/Support/Compiler.h" 26#include <algorithm> // for std::equal 27#include <map> 28#include <set> 29 30using namespace clang; 31 32//===----------------------------------------------------------------------===// 33// CheckDefaultArgumentVisitor 34//===----------------------------------------------------------------------===// 35 36namespace { 37 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 38 /// the default argument of a parameter to determine whether it 39 /// contains any ill-formed subexpressions. For example, this will 40 /// diagnose the use of local variables or parameters within the 41 /// default argument expression. 42 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 43 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 44 Expr *DefaultArg; 45 Sema *S; 46 47 public: 48 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 49 : DefaultArg(defarg), S(s) {} 50 51 bool VisitExpr(Expr *Node); 52 bool VisitDeclRefExpr(DeclRefExpr *DRE); 53 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 54 }; 55 56 /// VisitExpr - Visit all of the children of this expression. 57 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 58 bool IsInvalid = false; 59 for (Stmt::child_iterator I = Node->child_begin(), 60 E = Node->child_end(); I != E; ++I) 61 IsInvalid |= Visit(*I); 62 return IsInvalid; 63 } 64 65 /// VisitDeclRefExpr - Visit a reference to a declaration, to 66 /// determine whether this declaration can be used in the default 67 /// argument expression. 68 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 69 NamedDecl *Decl = DRE->getDecl(); 70 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 71 // C++ [dcl.fct.default]p9 72 // Default arguments are evaluated each time the function is 73 // called. The order of evaluation of function arguments is 74 // unspecified. Consequently, parameters of a function shall not 75 // be used in default argument expressions, even if they are not 76 // evaluated. Parameters of a function declared before a default 77 // argument expression are in scope and can hide namespace and 78 // class member names. 79 return S->Diag(DRE->getSourceRange().getBegin(), 80 diag::err_param_default_argument_references_param) 81 << Param->getDeclName() << DefaultArg->getSourceRange(); 82 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p7 84 // Local variables shall not be used in default argument 85 // expressions. 86 if (VDecl->isBlockVarDecl()) 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_local) 89 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 90 } 91 92 return false; 93 } 94 95 /// VisitCXXThisExpr - Visit a C++ "this" expression. 96 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 97 // C++ [dcl.fct.default]p8: 98 // The keyword this shall not be used in a default argument of a 99 // member function. 100 return S->Diag(ThisE->getSourceRange().getBegin(), 101 diag::err_param_default_argument_references_this) 102 << ThisE->getSourceRange(); 103 } 104} 105 106bool 107Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 108 SourceLocation EqualLoc) { 109 QualType ParamType = Param->getType(); 110 111 if (RequireCompleteType(Param->getLocation(), Param->getType(), 112 diag::err_typecheck_decl_incomplete_type)) { 113 Param->setInvalidDecl(); 114 return true; 115 } 116 117 Expr *Arg = (Expr *)DefaultArg.get(); 118 119 // C++ [dcl.fct.default]p5 120 // A default argument expression is implicitly converted (clause 121 // 4) to the parameter type. The default argument expression has 122 // the same semantic constraints as the initializer expression in 123 // a declaration of a variable of the parameter type, using the 124 // copy-initialization semantics (8.5). 125 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 126 Param->getDeclName(), /*DirectInit=*/false)) 127 return true; 128 129 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 130 131 // Okay: add the default argument to the parameter 132 Param->setDefaultArg(Arg); 133 134 DefaultArg.release(); 135 136 return false; 137} 138 139/// ActOnParamDefaultArgument - Check whether the default argument 140/// provided for a function parameter is well-formed. If so, attach it 141/// to the parameter declaration. 142void 143Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 144 ExprArg defarg) { 145 if (!param || !defarg.get()) 146 return; 147 148 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 149 UnparsedDefaultArgLocs.erase(Param); 150 151 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 152 QualType ParamType = Param->getType(); 153 154 // Default arguments are only permitted in C++ 155 if (!getLangOptions().CPlusPlus) { 156 Diag(EqualLoc, diag::err_param_default_argument) 157 << DefaultArg->getSourceRange(); 158 Param->setInvalidDecl(); 159 return; 160 } 161 162 // Check that the default argument is well-formed 163 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 164 if (DefaultArgChecker.Visit(DefaultArg.get())) { 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 170} 171 172/// ActOnParamUnparsedDefaultArgument - We've seen a default 173/// argument for a function parameter, but we can't parse it yet 174/// because we're inside a class definition. Note that this default 175/// argument will be parsed later. 176void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 177 SourceLocation EqualLoc, 178 SourceLocation ArgLoc) { 179 if (!param) 180 return; 181 182 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 183 if (Param) 184 Param->setUnparsedDefaultArg(); 185 186 UnparsedDefaultArgLocs[Param] = ArgLoc; 187} 188 189/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 190/// the default argument for the parameter param failed. 191void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 192 if (!param) 193 return; 194 195 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 196 197 Param->setInvalidDecl(); 198 199 UnparsedDefaultArgLocs.erase(Param); 200} 201 202/// CheckExtraCXXDefaultArguments - Check for any extra default 203/// arguments in the declarator, which is not a function declaration 204/// or definition and therefore is not permitted to have default 205/// arguments. This routine should be invoked for every declarator 206/// that is not a function declaration or definition. 207void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 208 // C++ [dcl.fct.default]p3 209 // A default argument expression shall be specified only in the 210 // parameter-declaration-clause of a function declaration or in a 211 // template-parameter (14.1). It shall not be specified for a 212 // parameter pack. If it is specified in a 213 // parameter-declaration-clause, it shall not occur within a 214 // declarator or abstract-declarator of a parameter-declaration. 215 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 216 DeclaratorChunk &chunk = D.getTypeObject(i); 217 if (chunk.Kind == DeclaratorChunk::Function) { 218 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 219 ParmVarDecl *Param = 220 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 221 if (Param->hasUnparsedDefaultArg()) { 222 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 223 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 224 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 225 delete Toks; 226 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 227 } else if (Param->getDefaultArg()) { 228 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 229 << Param->getDefaultArg()->getSourceRange(); 230 Param->setDefaultArg(0); 231 } 232 } 233 } 234 } 235} 236 237// MergeCXXFunctionDecl - Merge two declarations of the same C++ 238// function, once we already know that they have the same 239// type. Subroutine of MergeFunctionDecl. Returns true if there was an 240// error, false otherwise. 241bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 242 bool Invalid = false; 243 244 // C++ [dcl.fct.default]p4: 245 // For non-template functions, default arguments can be added in 246 // later declarations of a function in the same 247 // scope. Declarations in different scopes have completely 248 // distinct sets of default arguments. That is, declarations in 249 // inner scopes do not acquire default arguments from 250 // declarations in outer scopes, and vice versa. In a given 251 // function declaration, all parameters subsequent to a 252 // parameter with a default argument shall have default 253 // arguments supplied in this or previous declarations. A 254 // default argument shall not be redefined by a later 255 // declaration (not even to the same value). 256 // 257 // C++ [dcl.fct.default]p6: 258 // Except for member functions of class templates, the default arguments 259 // in a member function definition that appears outside of the class 260 // definition are added to the set of default arguments provided by the 261 // member function declaration in the class definition. 262 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 263 ParmVarDecl *OldParam = Old->getParamDecl(p); 264 ParmVarDecl *NewParam = New->getParamDecl(p); 265 266 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 267 Diag(NewParam->getLocation(), 268 diag::err_param_default_argument_redefinition) 269 << NewParam->getDefaultArgRange(); 270 271 // Look for the function declaration where the default argument was 272 // actually written, which may be a declaration prior to Old. 273 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 274 Older; Older = Older->getPreviousDeclaration()) { 275 if (!Older->getParamDecl(p)->hasDefaultArg()) 276 break; 277 278 OldParam = Older->getParamDecl(p); 279 } 280 281 Diag(OldParam->getLocation(), diag::note_previous_definition) 282 << OldParam->getDefaultArgRange(); 283 Invalid = true; 284 } else if (OldParam->hasDefaultArg()) { 285 // Merge the old default argument into the new parameter 286 if (OldParam->hasUninstantiatedDefaultArg()) 287 NewParam->setUninstantiatedDefaultArg( 288 OldParam->getUninstantiatedDefaultArg()); 289 else 290 NewParam->setDefaultArg(OldParam->getDefaultArg()); 291 } else if (NewParam->hasDefaultArg()) { 292 if (New->getDescribedFunctionTemplate()) { 293 // Paragraph 4, quoted above, only applies to non-template functions. 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_template_redecl) 296 << NewParam->getDefaultArgRange(); 297 Diag(Old->getLocation(), diag::note_template_prev_declaration) 298 << false; 299 } else if (New->getTemplateSpecializationKind() 300 != TSK_ImplicitInstantiation && 301 New->getTemplateSpecializationKind() != TSK_Undeclared) { 302 // C++ [temp.expr.spec]p21: 303 // Default function arguments shall not be specified in a declaration 304 // or a definition for one of the following explicit specializations: 305 // - the explicit specialization of a function template; 306 // - the explicit specialization of a member function template; 307 // - the explicit specialization of a member function of a class 308 // template where the class template specialization to which the 309 // member function specialization belongs is implicitly 310 // instantiated. 311 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 312 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 313 << New->getDeclName() 314 << NewParam->getDefaultArgRange(); 315 } else if (New->getDeclContext()->isDependentContext()) { 316 // C++ [dcl.fct.default]p6 (DR217): 317 // Default arguments for a member function of a class template shall 318 // be specified on the initial declaration of the member function 319 // within the class template. 320 // 321 // Reading the tea leaves a bit in DR217 and its reference to DR205 322 // leads me to the conclusion that one cannot add default function 323 // arguments for an out-of-line definition of a member function of a 324 // dependent type. 325 int WhichKind = 2; 326 if (CXXRecordDecl *Record 327 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 328 if (Record->getDescribedClassTemplate()) 329 WhichKind = 0; 330 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 331 WhichKind = 1; 332 else 333 WhichKind = 2; 334 } 335 336 Diag(NewParam->getLocation(), 337 diag::err_param_default_argument_member_template_redecl) 338 << WhichKind 339 << NewParam->getDefaultArgRange(); 340 } 341 } 342 } 343 344 if (CheckEquivalentExceptionSpec( 345 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 346 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) { 347 Invalid = true; 348 } 349 350 return Invalid; 351} 352 353/// CheckCXXDefaultArguments - Verify that the default arguments for a 354/// function declaration are well-formed according to C++ 355/// [dcl.fct.default]. 356void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 357 unsigned NumParams = FD->getNumParams(); 358 unsigned p; 359 360 // Find first parameter with a default argument 361 for (p = 0; p < NumParams; ++p) { 362 ParmVarDecl *Param = FD->getParamDecl(p); 363 if (Param->hasDefaultArg()) 364 break; 365 } 366 367 // C++ [dcl.fct.default]p4: 368 // In a given function declaration, all parameters 369 // subsequent to a parameter with a default argument shall 370 // have default arguments supplied in this or previous 371 // declarations. A default argument shall not be redefined 372 // by a later declaration (not even to the same value). 373 unsigned LastMissingDefaultArg = 0; 374 for (; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (!Param->hasDefaultArg()) { 377 if (Param->isInvalidDecl()) 378 /* We already complained about this parameter. */; 379 else if (Param->getIdentifier()) 380 Diag(Param->getLocation(), 381 diag::err_param_default_argument_missing_name) 382 << Param->getIdentifier(); 383 else 384 Diag(Param->getLocation(), 385 diag::err_param_default_argument_missing); 386 387 LastMissingDefaultArg = p; 388 } 389 } 390 391 if (LastMissingDefaultArg > 0) { 392 // Some default arguments were missing. Clear out all of the 393 // default arguments up to (and including) the last missing 394 // default argument, so that we leave the function parameters 395 // in a semantically valid state. 396 for (p = 0; p <= LastMissingDefaultArg; ++p) { 397 ParmVarDecl *Param = FD->getParamDecl(p); 398 if (Param->hasDefaultArg()) { 399 if (!Param->hasUnparsedDefaultArg()) 400 Param->getDefaultArg()->Destroy(Context); 401 Param->setDefaultArg(0); 402 } 403 } 404 } 405} 406 407/// isCurrentClassName - Determine whether the identifier II is the 408/// name of the class type currently being defined. In the case of 409/// nested classes, this will only return true if II is the name of 410/// the innermost class. 411bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 412 const CXXScopeSpec *SS) { 413 CXXRecordDecl *CurDecl; 414 if (SS && SS->isSet() && !SS->isInvalid()) { 415 DeclContext *DC = computeDeclContext(*SS, true); 416 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 417 } else 418 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 419 420 if (CurDecl) 421 return &II == CurDecl->getIdentifier(); 422 else 423 return false; 424} 425 426/// \brief Check the validity of a C++ base class specifier. 427/// 428/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 429/// and returns NULL otherwise. 430CXXBaseSpecifier * 431Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 432 SourceRange SpecifierRange, 433 bool Virtual, AccessSpecifier Access, 434 QualType BaseType, 435 SourceLocation BaseLoc) { 436 // C++ [class.union]p1: 437 // A union shall not have base classes. 438 if (Class->isUnion()) { 439 Diag(Class->getLocation(), diag::err_base_clause_on_union) 440 << SpecifierRange; 441 return 0; 442 } 443 444 if (BaseType->isDependentType()) 445 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 446 Class->getTagKind() == RecordDecl::TK_class, 447 Access, BaseType); 448 449 // Base specifiers must be record types. 450 if (!BaseType->isRecordType()) { 451 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 452 return 0; 453 } 454 455 // C++ [class.union]p1: 456 // A union shall not be used as a base class. 457 if (BaseType->isUnionType()) { 458 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 459 return 0; 460 } 461 462 // C++ [class.derived]p2: 463 // The class-name in a base-specifier shall not be an incompletely 464 // defined class. 465 if (RequireCompleteType(BaseLoc, BaseType, 466 PDiag(diag::err_incomplete_base_class) 467 << SpecifierRange)) 468 return 0; 469 470 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 471 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 472 assert(BaseDecl && "Record type has no declaration"); 473 BaseDecl = BaseDecl->getDefinition(Context); 474 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 475 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 476 assert(CXXBaseDecl && "Base type is not a C++ type"); 477 if (!CXXBaseDecl->isEmpty()) 478 Class->setEmpty(false); 479 if (CXXBaseDecl->isPolymorphic()) 480 Class->setPolymorphic(true); 481 482 // C++ [dcl.init.aggr]p1: 483 // An aggregate is [...] a class with [...] no base classes [...]. 484 Class->setAggregate(false); 485 Class->setPOD(false); 486 487 if (Virtual) { 488 // C++ [class.ctor]p5: 489 // A constructor is trivial if its class has no virtual base classes. 490 Class->setHasTrivialConstructor(false); 491 492 // C++ [class.copy]p6: 493 // A copy constructor is trivial if its class has no virtual base classes. 494 Class->setHasTrivialCopyConstructor(false); 495 496 // C++ [class.copy]p11: 497 // A copy assignment operator is trivial if its class has no virtual 498 // base classes. 499 Class->setHasTrivialCopyAssignment(false); 500 501 // C++0x [meta.unary.prop] is_empty: 502 // T is a class type, but not a union type, with ... no virtual base 503 // classes 504 Class->setEmpty(false); 505 } else { 506 // C++ [class.ctor]p5: 507 // A constructor is trivial if all the direct base classes of its 508 // class have trivial constructors. 509 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 510 Class->setHasTrivialConstructor(false); 511 512 // C++ [class.copy]p6: 513 // A copy constructor is trivial if all the direct base classes of its 514 // class have trivial copy constructors. 515 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 516 Class->setHasTrivialCopyConstructor(false); 517 518 // C++ [class.copy]p11: 519 // A copy assignment operator is trivial if all the direct base classes 520 // of its class have trivial copy assignment operators. 521 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 522 Class->setHasTrivialCopyAssignment(false); 523 } 524 525 // C++ [class.ctor]p3: 526 // A destructor is trivial if all the direct base classes of its class 527 // have trivial destructors. 528 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 529 Class->setHasTrivialDestructor(false); 530 531 // Create the base specifier. 532 // FIXME: Allocate via ASTContext? 533 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 534 Class->getTagKind() == RecordDecl::TK_class, 535 Access, BaseType); 536} 537 538/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 539/// one entry in the base class list of a class specifier, for 540/// example: 541/// class foo : public bar, virtual private baz { 542/// 'public bar' and 'virtual private baz' are each base-specifiers. 543Sema::BaseResult 544Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 545 bool Virtual, AccessSpecifier Access, 546 TypeTy *basetype, SourceLocation BaseLoc) { 547 if (!classdecl) 548 return true; 549 550 AdjustDeclIfTemplate(classdecl); 551 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 552 QualType BaseType = GetTypeFromParser(basetype); 553 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 554 Virtual, Access, 555 BaseType, BaseLoc)) 556 return BaseSpec; 557 558 return true; 559} 560 561/// \brief Performs the actual work of attaching the given base class 562/// specifiers to a C++ class. 563bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 564 unsigned NumBases) { 565 if (NumBases == 0) 566 return false; 567 568 // Used to keep track of which base types we have already seen, so 569 // that we can properly diagnose redundant direct base types. Note 570 // that the key is always the unqualified canonical type of the base 571 // class. 572 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 573 574 // Copy non-redundant base specifiers into permanent storage. 575 unsigned NumGoodBases = 0; 576 bool Invalid = false; 577 for (unsigned idx = 0; idx < NumBases; ++idx) { 578 QualType NewBaseType 579 = Context.getCanonicalType(Bases[idx]->getType()); 580 NewBaseType = NewBaseType.getUnqualifiedType(); 581 582 if (KnownBaseTypes[NewBaseType]) { 583 // C++ [class.mi]p3: 584 // A class shall not be specified as a direct base class of a 585 // derived class more than once. 586 Diag(Bases[idx]->getSourceRange().getBegin(), 587 diag::err_duplicate_base_class) 588 << KnownBaseTypes[NewBaseType]->getType() 589 << Bases[idx]->getSourceRange(); 590 591 // Delete the duplicate base class specifier; we're going to 592 // overwrite its pointer later. 593 Context.Deallocate(Bases[idx]); 594 595 Invalid = true; 596 } else { 597 // Okay, add this new base class. 598 KnownBaseTypes[NewBaseType] = Bases[idx]; 599 Bases[NumGoodBases++] = Bases[idx]; 600 } 601 } 602 603 // Attach the remaining base class specifiers to the derived class. 604 Class->setBases(Context, Bases, NumGoodBases); 605 606 // Delete the remaining (good) base class specifiers, since their 607 // data has been copied into the CXXRecordDecl. 608 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 609 Context.Deallocate(Bases[idx]); 610 611 return Invalid; 612} 613 614/// ActOnBaseSpecifiers - Attach the given base specifiers to the 615/// class, after checking whether there are any duplicate base 616/// classes. 617void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 618 unsigned NumBases) { 619 if (!ClassDecl || !Bases || !NumBases) 620 return; 621 622 AdjustDeclIfTemplate(ClassDecl); 623 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 624 (CXXBaseSpecifier**)(Bases), NumBases); 625} 626 627/// \brief Determine whether the type \p Derived is a C++ class that is 628/// derived from the type \p Base. 629bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 630 if (!getLangOptions().CPlusPlus) 631 return false; 632 633 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 634 if (!DerivedRT) 635 return false; 636 637 const RecordType *BaseRT = Base->getAs<RecordType>(); 638 if (!BaseRT) 639 return false; 640 641 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 642 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 643 return DerivedRD->isDerivedFrom(BaseRD); 644} 645 646/// \brief Determine whether the type \p Derived is a C++ class that is 647/// derived from the type \p Base. 648bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 649 if (!getLangOptions().CPlusPlus) 650 return false; 651 652 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 653 if (!DerivedRT) 654 return false; 655 656 const RecordType *BaseRT = Base->getAs<RecordType>(); 657 if (!BaseRT) 658 return false; 659 660 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 661 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 662 return DerivedRD->isDerivedFrom(BaseRD, Paths); 663} 664 665/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 666/// conversion (where Derived and Base are class types) is 667/// well-formed, meaning that the conversion is unambiguous (and 668/// that all of the base classes are accessible). Returns true 669/// and emits a diagnostic if the code is ill-formed, returns false 670/// otherwise. Loc is the location where this routine should point to 671/// if there is an error, and Range is the source range to highlight 672/// if there is an error. 673bool 674Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 675 unsigned InaccessibleBaseID, 676 unsigned AmbigiousBaseConvID, 677 SourceLocation Loc, SourceRange Range, 678 DeclarationName Name) { 679 // First, determine whether the path from Derived to Base is 680 // ambiguous. This is slightly more expensive than checking whether 681 // the Derived to Base conversion exists, because here we need to 682 // explore multiple paths to determine if there is an ambiguity. 683 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 684 /*DetectVirtual=*/false); 685 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 686 assert(DerivationOkay && 687 "Can only be used with a derived-to-base conversion"); 688 (void)DerivationOkay; 689 690 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 691 // Check that the base class can be accessed. 692 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 693 Name); 694 } 695 696 // We know that the derived-to-base conversion is ambiguous, and 697 // we're going to produce a diagnostic. Perform the derived-to-base 698 // search just one more time to compute all of the possible paths so 699 // that we can print them out. This is more expensive than any of 700 // the previous derived-to-base checks we've done, but at this point 701 // performance isn't as much of an issue. 702 Paths.clear(); 703 Paths.setRecordingPaths(true); 704 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 705 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 706 (void)StillOkay; 707 708 // Build up a textual representation of the ambiguous paths, e.g., 709 // D -> B -> A, that will be used to illustrate the ambiguous 710 // conversions in the diagnostic. We only print one of the paths 711 // to each base class subobject. 712 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 713 714 Diag(Loc, AmbigiousBaseConvID) 715 << Derived << Base << PathDisplayStr << Range << Name; 716 return true; 717} 718 719bool 720Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 721 SourceLocation Loc, SourceRange Range) { 722 return CheckDerivedToBaseConversion(Derived, Base, 723 diag::err_conv_to_inaccessible_base, 724 diag::err_ambiguous_derived_to_base_conv, 725 Loc, Range, DeclarationName()); 726} 727 728 729/// @brief Builds a string representing ambiguous paths from a 730/// specific derived class to different subobjects of the same base 731/// class. 732/// 733/// This function builds a string that can be used in error messages 734/// to show the different paths that one can take through the 735/// inheritance hierarchy to go from the derived class to different 736/// subobjects of a base class. The result looks something like this: 737/// @code 738/// struct D -> struct B -> struct A 739/// struct D -> struct C -> struct A 740/// @endcode 741std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 742 std::string PathDisplayStr; 743 std::set<unsigned> DisplayedPaths; 744 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 745 Path != Paths.end(); ++Path) { 746 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 747 // We haven't displayed a path to this particular base 748 // class subobject yet. 749 PathDisplayStr += "\n "; 750 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 751 for (CXXBasePath::const_iterator Element = Path->begin(); 752 Element != Path->end(); ++Element) 753 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 754 } 755 } 756 757 return PathDisplayStr; 758} 759 760//===----------------------------------------------------------------------===// 761// C++ class member Handling 762//===----------------------------------------------------------------------===// 763 764/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 765/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 766/// bitfield width if there is one and 'InitExpr' specifies the initializer if 767/// any. 768Sema::DeclPtrTy 769Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 770 MultiTemplateParamsArg TemplateParameterLists, 771 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 772 const DeclSpec &DS = D.getDeclSpec(); 773 DeclarationName Name = GetNameForDeclarator(D); 774 Expr *BitWidth = static_cast<Expr*>(BW); 775 Expr *Init = static_cast<Expr*>(InitExpr); 776 SourceLocation Loc = D.getIdentifierLoc(); 777 778 bool isFunc = D.isFunctionDeclarator(); 779 780 assert(!DS.isFriendSpecified()); 781 782 // C++ 9.2p6: A member shall not be declared to have automatic storage 783 // duration (auto, register) or with the extern storage-class-specifier. 784 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 785 // data members and cannot be applied to names declared const or static, 786 // and cannot be applied to reference members. 787 switch (DS.getStorageClassSpec()) { 788 case DeclSpec::SCS_unspecified: 789 case DeclSpec::SCS_typedef: 790 case DeclSpec::SCS_static: 791 // FALL THROUGH. 792 break; 793 case DeclSpec::SCS_mutable: 794 if (isFunc) { 795 if (DS.getStorageClassSpecLoc().isValid()) 796 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 797 else 798 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 799 800 // FIXME: It would be nicer if the keyword was ignored only for this 801 // declarator. Otherwise we could get follow-up errors. 802 D.getMutableDeclSpec().ClearStorageClassSpecs(); 803 } else { 804 QualType T = GetTypeForDeclarator(D, S); 805 diag::kind err = static_cast<diag::kind>(0); 806 if (T->isReferenceType()) 807 err = diag::err_mutable_reference; 808 else if (T.isConstQualified()) 809 err = diag::err_mutable_const; 810 if (err != 0) { 811 if (DS.getStorageClassSpecLoc().isValid()) 812 Diag(DS.getStorageClassSpecLoc(), err); 813 else 814 Diag(DS.getThreadSpecLoc(), err); 815 // FIXME: It would be nicer if the keyword was ignored only for this 816 // declarator. Otherwise we could get follow-up errors. 817 D.getMutableDeclSpec().ClearStorageClassSpecs(); 818 } 819 } 820 break; 821 default: 822 if (DS.getStorageClassSpecLoc().isValid()) 823 Diag(DS.getStorageClassSpecLoc(), 824 diag::err_storageclass_invalid_for_member); 825 else 826 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 827 D.getMutableDeclSpec().ClearStorageClassSpecs(); 828 } 829 830 if (!isFunc && 831 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 832 D.getNumTypeObjects() == 0) { 833 // Check also for this case: 834 // 835 // typedef int f(); 836 // f a; 837 // 838 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 839 isFunc = TDType->isFunctionType(); 840 } 841 842 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 843 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 844 !isFunc); 845 846 Decl *Member; 847 if (isInstField) { 848 // FIXME: Check for template parameters! 849 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 850 AS); 851 assert(Member && "HandleField never returns null"); 852 } else { 853 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 854 .getAs<Decl>(); 855 if (!Member) { 856 if (BitWidth) DeleteExpr(BitWidth); 857 return DeclPtrTy(); 858 } 859 860 // Non-instance-fields can't have a bitfield. 861 if (BitWidth) { 862 if (Member->isInvalidDecl()) { 863 // don't emit another diagnostic. 864 } else if (isa<VarDecl>(Member)) { 865 // C++ 9.6p3: A bit-field shall not be a static member. 866 // "static member 'A' cannot be a bit-field" 867 Diag(Loc, diag::err_static_not_bitfield) 868 << Name << BitWidth->getSourceRange(); 869 } else if (isa<TypedefDecl>(Member)) { 870 // "typedef member 'x' cannot be a bit-field" 871 Diag(Loc, diag::err_typedef_not_bitfield) 872 << Name << BitWidth->getSourceRange(); 873 } else { 874 // A function typedef ("typedef int f(); f a;"). 875 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 876 Diag(Loc, diag::err_not_integral_type_bitfield) 877 << Name << cast<ValueDecl>(Member)->getType() 878 << BitWidth->getSourceRange(); 879 } 880 881 DeleteExpr(BitWidth); 882 BitWidth = 0; 883 Member->setInvalidDecl(); 884 } 885 886 Member->setAccess(AS); 887 888 // If we have declared a member function template, set the access of the 889 // templated declaration as well. 890 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 891 FunTmpl->getTemplatedDecl()->setAccess(AS); 892 } 893 894 assert((Name || isInstField) && "No identifier for non-field ?"); 895 896 if (Init) 897 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 898 if (Deleted) // FIXME: Source location is not very good. 899 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 900 901 if (isInstField) { 902 FieldCollector->Add(cast<FieldDecl>(Member)); 903 return DeclPtrTy(); 904 } 905 return DeclPtrTy::make(Member); 906} 907 908/// ActOnMemInitializer - Handle a C++ member initializer. 909Sema::MemInitResult 910Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 911 Scope *S, 912 const CXXScopeSpec &SS, 913 IdentifierInfo *MemberOrBase, 914 TypeTy *TemplateTypeTy, 915 SourceLocation IdLoc, 916 SourceLocation LParenLoc, 917 ExprTy **Args, unsigned NumArgs, 918 SourceLocation *CommaLocs, 919 SourceLocation RParenLoc) { 920 if (!ConstructorD) 921 return true; 922 923 AdjustDeclIfTemplate(ConstructorD); 924 925 CXXConstructorDecl *Constructor 926 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 927 if (!Constructor) { 928 // The user wrote a constructor initializer on a function that is 929 // not a C++ constructor. Ignore the error for now, because we may 930 // have more member initializers coming; we'll diagnose it just 931 // once in ActOnMemInitializers. 932 return true; 933 } 934 935 CXXRecordDecl *ClassDecl = Constructor->getParent(); 936 937 // C++ [class.base.init]p2: 938 // Names in a mem-initializer-id are looked up in the scope of the 939 // constructor���s class and, if not found in that scope, are looked 940 // up in the scope containing the constructor���s 941 // definition. [Note: if the constructor���s class contains a member 942 // with the same name as a direct or virtual base class of the 943 // class, a mem-initializer-id naming the member or base class and 944 // composed of a single identifier refers to the class member. A 945 // mem-initializer-id for the hidden base class may be specified 946 // using a qualified name. ] 947 if (!SS.getScopeRep() && !TemplateTypeTy) { 948 // Look for a member, first. 949 FieldDecl *Member = 0; 950 DeclContext::lookup_result Result 951 = ClassDecl->lookup(MemberOrBase); 952 if (Result.first != Result.second) 953 Member = dyn_cast<FieldDecl>(*Result.first); 954 955 // FIXME: Handle members of an anonymous union. 956 957 if (Member) 958 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 959 RParenLoc); 960 } 961 // It didn't name a member, so see if it names a class. 962 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 963 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 964 if (!BaseTy) 965 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 966 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 967 968 QualType BaseType = GetTypeFromParser(BaseTy); 969 970 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 971 RParenLoc, ClassDecl); 972} 973 974Sema::MemInitResult 975Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 976 unsigned NumArgs, SourceLocation IdLoc, 977 SourceLocation RParenLoc) { 978 bool HasDependentArg = false; 979 for (unsigned i = 0; i < NumArgs; i++) 980 HasDependentArg |= Args[i]->isTypeDependent(); 981 982 CXXConstructorDecl *C = 0; 983 QualType FieldType = Member->getType(); 984 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 985 FieldType = Array->getElementType(); 986 if (FieldType->isDependentType()) { 987 // Can't check init for dependent type. 988 } else if (FieldType->getAs<RecordType>()) { 989 if (!HasDependentArg) { 990 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 991 992 C = PerformInitializationByConstructor(FieldType, 993 MultiExprArg(*this, 994 (void**)Args, 995 NumArgs), 996 IdLoc, 997 SourceRange(IdLoc, RParenLoc), 998 Member->getDeclName(), IK_Direct, 999 ConstructorArgs); 1000 1001 if (C) { 1002 // Take over the constructor arguments as our own. 1003 NumArgs = ConstructorArgs.size(); 1004 Args = (Expr **)ConstructorArgs.take(); 1005 } 1006 } 1007 } else if (NumArgs != 1 && NumArgs != 0) { 1008 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1009 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1010 } else if (!HasDependentArg) { 1011 Expr *NewExp; 1012 if (NumArgs == 0) { 1013 if (FieldType->isReferenceType()) { 1014 Diag(IdLoc, diag::err_null_intialized_reference_member) 1015 << Member->getDeclName(); 1016 return Diag(Member->getLocation(), diag::note_declared_at); 1017 } 1018 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1019 NumArgs = 1; 1020 } 1021 else 1022 NewExp = (Expr*)Args[0]; 1023 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1024 return true; 1025 Args[0] = NewExp; 1026 } 1027 // FIXME: Perform direct initialization of the member. 1028 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1029 NumArgs, C, IdLoc, RParenLoc); 1030} 1031 1032Sema::MemInitResult 1033Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1034 unsigned NumArgs, SourceLocation IdLoc, 1035 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1036 bool HasDependentArg = false; 1037 for (unsigned i = 0; i < NumArgs; i++) 1038 HasDependentArg |= Args[i]->isTypeDependent(); 1039 1040 if (!BaseType->isDependentType()) { 1041 if (!BaseType->isRecordType()) 1042 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1043 << BaseType << SourceRange(IdLoc, RParenLoc); 1044 1045 // C++ [class.base.init]p2: 1046 // [...] Unless the mem-initializer-id names a nonstatic data 1047 // member of the constructor���s class or a direct or virtual base 1048 // of that class, the mem-initializer is ill-formed. A 1049 // mem-initializer-list can initialize a base class using any 1050 // name that denotes that base class type. 1051 1052 // First, check for a direct base class. 1053 const CXXBaseSpecifier *DirectBaseSpec = 0; 1054 for (CXXRecordDecl::base_class_const_iterator Base = 1055 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1056 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 1057 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 1058 // We found a direct base of this type. That's what we're 1059 // initializing. 1060 DirectBaseSpec = &*Base; 1061 break; 1062 } 1063 } 1064 1065 // Check for a virtual base class. 1066 // FIXME: We might be able to short-circuit this if we know in advance that 1067 // there are no virtual bases. 1068 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1069 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1070 // We haven't found a base yet; search the class hierarchy for a 1071 // virtual base class. 1072 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1073 /*DetectVirtual=*/false); 1074 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1075 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1076 Path != Paths.end(); ++Path) { 1077 if (Path->back().Base->isVirtual()) { 1078 VirtualBaseSpec = Path->back().Base; 1079 break; 1080 } 1081 } 1082 } 1083 } 1084 1085 // C++ [base.class.init]p2: 1086 // If a mem-initializer-id is ambiguous because it designates both 1087 // a direct non-virtual base class and an inherited virtual base 1088 // class, the mem-initializer is ill-formed. 1089 if (DirectBaseSpec && VirtualBaseSpec) 1090 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1091 << BaseType << SourceRange(IdLoc, RParenLoc); 1092 // C++ [base.class.init]p2: 1093 // Unless the mem-initializer-id names a nonstatic data membeer of the 1094 // constructor's class ot a direst or virtual base of that class, the 1095 // mem-initializer is ill-formed. 1096 if (!DirectBaseSpec && !VirtualBaseSpec) 1097 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1098 << BaseType << ClassDecl->getNameAsCString() 1099 << SourceRange(IdLoc, RParenLoc); 1100 } 1101 1102 CXXConstructorDecl *C = 0; 1103 if (!BaseType->isDependentType() && !HasDependentArg) { 1104 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1105 Context.getCanonicalType(BaseType)); 1106 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1107 1108 C = PerformInitializationByConstructor(BaseType, 1109 MultiExprArg(*this, 1110 (void**)Args, NumArgs), 1111 IdLoc, SourceRange(IdLoc, RParenLoc), 1112 Name, IK_Direct, 1113 ConstructorArgs); 1114 if (C) { 1115 // Take over the constructor arguments as our own. 1116 NumArgs = ConstructorArgs.size(); 1117 Args = (Expr **)ConstructorArgs.take(); 1118 } 1119 } 1120 1121 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1122 NumArgs, C, IdLoc, RParenLoc); 1123} 1124 1125void 1126Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1127 CXXBaseOrMemberInitializer **Initializers, 1128 unsigned NumInitializers, 1129 llvm::SmallVectorImpl<CXXBaseSpecifier *>& Bases, 1130 llvm::SmallVectorImpl<FieldDecl *>&Fields) { 1131 // We need to build the initializer AST according to order of construction 1132 // and not what user specified in the Initializers list. 1133 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1134 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1135 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1136 bool HasDependentBaseInit = false; 1137 1138 for (unsigned i = 0; i < NumInitializers; i++) { 1139 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1140 if (Member->isBaseInitializer()) { 1141 if (Member->getBaseClass()->isDependentType()) 1142 HasDependentBaseInit = true; 1143 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1144 } else { 1145 AllBaseFields[Member->getMember()] = Member; 1146 } 1147 } 1148 1149 if (HasDependentBaseInit) { 1150 // FIXME. This does not preserve the ordering of the initializers. 1151 // Try (with -Wreorder) 1152 // template<class X> struct A {}; 1153 // template<class X> struct B : A<X> { 1154 // B() : x1(10), A<X>() {} 1155 // int x1; 1156 // }; 1157 // B<int> x; 1158 // On seeing one dependent type, we should essentially exit this routine 1159 // while preserving user-declared initializer list. When this routine is 1160 // called during instantiatiation process, this routine will rebuild the 1161 // oderdered initializer list correctly. 1162 1163 // If we have a dependent base initialization, we can't determine the 1164 // association between initializers and bases; just dump the known 1165 // initializers into the list, and don't try to deal with other bases. 1166 for (unsigned i = 0; i < NumInitializers; i++) { 1167 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1168 if (Member->isBaseInitializer()) 1169 AllToInit.push_back(Member); 1170 } 1171 } else { 1172 // Push virtual bases before others. 1173 for (CXXRecordDecl::base_class_iterator VBase = 1174 ClassDecl->vbases_begin(), 1175 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1176 if (VBase->getType()->isDependentType()) 1177 continue; 1178 if (CXXBaseOrMemberInitializer *Value = 1179 AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1180 CXXRecordDecl *BaseDecl = 1181 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1182 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1183 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context)) 1184 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1185 AllToInit.push_back(Value); 1186 } 1187 else { 1188 CXXRecordDecl *VBaseDecl = 1189 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1190 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1191 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1192 if (!Ctor) { 1193 Bases.push_back(VBase); 1194 continue; 1195 } 1196 1197 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1198 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1199 Constructor->getLocation(), CtorArgs)) 1200 continue; 1201 1202 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1203 1204 CXXBaseOrMemberInitializer *Member = 1205 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1206 CtorArgs.takeAs<Expr>(), 1207 CtorArgs.size(), Ctor, 1208 SourceLocation(), 1209 SourceLocation()); 1210 AllToInit.push_back(Member); 1211 } 1212 } 1213 1214 for (CXXRecordDecl::base_class_iterator Base = 1215 ClassDecl->bases_begin(), 1216 E = ClassDecl->bases_end(); Base != E; ++Base) { 1217 // Virtuals are in the virtual base list and already constructed. 1218 if (Base->isVirtual()) 1219 continue; 1220 // Skip dependent types. 1221 if (Base->getType()->isDependentType()) 1222 continue; 1223 if (CXXBaseOrMemberInitializer *Value = 1224 AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1225 CXXRecordDecl *BaseDecl = 1226 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1227 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1228 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context)) 1229 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1230 AllToInit.push_back(Value); 1231 } 1232 else { 1233 CXXRecordDecl *BaseDecl = 1234 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1235 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1236 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1237 if (!Ctor) { 1238 Bases.push_back(Base); 1239 continue; 1240 } 1241 1242 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1243 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1244 Constructor->getLocation(), CtorArgs)) 1245 continue; 1246 1247 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1248 1249 CXXBaseOrMemberInitializer *Member = 1250 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1251 CtorArgs.takeAs<Expr>(), 1252 CtorArgs.size(), Ctor, 1253 SourceLocation(), 1254 SourceLocation()); 1255 AllToInit.push_back(Member); 1256 } 1257 } 1258 } 1259 1260 // non-static data members. 1261 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1262 E = ClassDecl->field_end(); Field != E; ++Field) { 1263 if ((*Field)->isAnonymousStructOrUnion()) { 1264 if (const RecordType *FieldClassType = 1265 Field->getType()->getAs<RecordType>()) { 1266 CXXRecordDecl *FieldClassDecl 1267 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1268 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1269 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1270 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1271 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1272 // set to the anonymous union data member used in the initializer 1273 // list. 1274 Value->setMember(*Field); 1275 Value->setAnonUnionMember(*FA); 1276 AllToInit.push_back(Value); 1277 break; 1278 } 1279 } 1280 } 1281 continue; 1282 } 1283 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1284 QualType FT = (*Field)->getType(); 1285 if (const RecordType* RT = FT->getAs<RecordType>()) { 1286 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RT->getDecl()); 1287 assert(FieldRecDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1288 if (CXXConstructorDecl *Ctor = 1289 FieldRecDecl->getDefaultConstructor(Context)) 1290 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1291 } 1292 AllToInit.push_back(Value); 1293 continue; 1294 } 1295 1296 QualType FT = Context.getBaseElementType((*Field)->getType()); 1297 if (const RecordType* RT = FT->getAs<RecordType>()) { 1298 CXXConstructorDecl *Ctor = 1299 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1300 if (!Ctor && !FT->isDependentType()) { 1301 Fields.push_back(*Field); 1302 continue; 1303 } 1304 1305 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1306 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1307 Constructor->getLocation(), CtorArgs)) 1308 continue; 1309 1310 CXXBaseOrMemberInitializer *Member = 1311 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1312 CtorArgs.size(), Ctor, 1313 SourceLocation(), 1314 SourceLocation()); 1315 1316 AllToInit.push_back(Member); 1317 if (Ctor) 1318 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1319 if (FT.isConstQualified() && (!Ctor || Ctor->isTrivial())) { 1320 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1321 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName(); 1322 Diag((*Field)->getLocation(), diag::note_declared_at); 1323 } 1324 } 1325 else if (FT->isReferenceType()) { 1326 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1327 << Context.getTagDeclType(ClassDecl) << 0 << (*Field)->getDeclName(); 1328 Diag((*Field)->getLocation(), diag::note_declared_at); 1329 } 1330 else if (FT.isConstQualified()) { 1331 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1332 << Context.getTagDeclType(ClassDecl) << 1 << (*Field)->getDeclName(); 1333 Diag((*Field)->getLocation(), diag::note_declared_at); 1334 } 1335 } 1336 1337 NumInitializers = AllToInit.size(); 1338 if (NumInitializers > 0) { 1339 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1340 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1341 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1342 1343 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1344 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1345 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1346 } 1347} 1348 1349void 1350Sema::BuildBaseOrMemberInitializers(ASTContext &C, 1351 CXXConstructorDecl *Constructor, 1352 CXXBaseOrMemberInitializer **Initializers, 1353 unsigned NumInitializers 1354 ) { 1355 llvm::SmallVector<CXXBaseSpecifier *, 4> Bases; 1356 llvm::SmallVector<FieldDecl *, 4> Members; 1357 1358 SetBaseOrMemberInitializers(Constructor, 1359 Initializers, NumInitializers, Bases, Members); 1360 for (unsigned int i = 0; i < Bases.size(); i++) 1361 Diag(Bases[i]->getSourceRange().getBegin(), 1362 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 1363 for (unsigned int i = 0; i < Members.size(); i++) 1364 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 1365 << 1 << Members[i]->getType(); 1366} 1367 1368static void *GetKeyForTopLevelField(FieldDecl *Field) { 1369 // For anonymous unions, use the class declaration as the key. 1370 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1371 if (RT->getDecl()->isAnonymousStructOrUnion()) 1372 return static_cast<void *>(RT->getDecl()); 1373 } 1374 return static_cast<void *>(Field); 1375} 1376 1377static void *GetKeyForBase(QualType BaseType) { 1378 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1379 return (void *)RT; 1380 1381 assert(0 && "Unexpected base type!"); 1382 return 0; 1383} 1384 1385static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1386 bool MemberMaybeAnon = false) { 1387 // For fields injected into the class via declaration of an anonymous union, 1388 // use its anonymous union class declaration as the unique key. 1389 if (Member->isMemberInitializer()) { 1390 FieldDecl *Field = Member->getMember(); 1391 1392 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 1393 // data member of the class. Data member used in the initializer list is 1394 // in AnonUnionMember field. 1395 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1396 Field = Member->getAnonUnionMember(); 1397 if (Field->getDeclContext()->isRecord()) { 1398 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1399 if (RD->isAnonymousStructOrUnion()) 1400 return static_cast<void *>(RD); 1401 } 1402 return static_cast<void *>(Field); 1403 } 1404 1405 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1406} 1407 1408void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1409 SourceLocation ColonLoc, 1410 MemInitTy **MemInits, unsigned NumMemInits) { 1411 if (!ConstructorDecl) 1412 return; 1413 1414 AdjustDeclIfTemplate(ConstructorDecl); 1415 1416 CXXConstructorDecl *Constructor 1417 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1418 1419 if (!Constructor) { 1420 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1421 return; 1422 } 1423 1424 if (!Constructor->isDependentContext()) { 1425 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1426 bool err = false; 1427 for (unsigned i = 0; i < NumMemInits; i++) { 1428 CXXBaseOrMemberInitializer *Member = 1429 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1430 void *KeyToMember = GetKeyForMember(Member); 1431 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1432 if (!PrevMember) { 1433 PrevMember = Member; 1434 continue; 1435 } 1436 if (FieldDecl *Field = Member->getMember()) 1437 Diag(Member->getSourceLocation(), 1438 diag::error_multiple_mem_initialization) 1439 << Field->getNameAsString(); 1440 else { 1441 Type *BaseClass = Member->getBaseClass(); 1442 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1443 Diag(Member->getSourceLocation(), 1444 diag::error_multiple_base_initialization) 1445 << QualType(BaseClass, 0); 1446 } 1447 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1448 << 0; 1449 err = true; 1450 } 1451 1452 if (err) 1453 return; 1454 } 1455 1456 BuildBaseOrMemberInitializers(Context, Constructor, 1457 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1458 NumMemInits); 1459 1460 if (Constructor->isDependentContext()) 1461 return; 1462 1463 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1464 Diagnostic::Ignored && 1465 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1466 Diagnostic::Ignored) 1467 return; 1468 1469 // Also issue warning if order of ctor-initializer list does not match order 1470 // of 1) base class declarations and 2) order of non-static data members. 1471 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1472 1473 CXXRecordDecl *ClassDecl 1474 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1475 // Push virtual bases before others. 1476 for (CXXRecordDecl::base_class_iterator VBase = 1477 ClassDecl->vbases_begin(), 1478 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1479 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1480 1481 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1482 E = ClassDecl->bases_end(); Base != E; ++Base) { 1483 // Virtuals are alread in the virtual base list and are constructed 1484 // first. 1485 if (Base->isVirtual()) 1486 continue; 1487 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1488 } 1489 1490 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1491 E = ClassDecl->field_end(); Field != E; ++Field) 1492 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1493 1494 int Last = AllBaseOrMembers.size(); 1495 int curIndex = 0; 1496 CXXBaseOrMemberInitializer *PrevMember = 0; 1497 for (unsigned i = 0; i < NumMemInits; i++) { 1498 CXXBaseOrMemberInitializer *Member = 1499 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1500 void *MemberInCtorList = GetKeyForMember(Member, true); 1501 1502 for (; curIndex < Last; curIndex++) 1503 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1504 break; 1505 if (curIndex == Last) { 1506 assert(PrevMember && "Member not in member list?!"); 1507 // Initializer as specified in ctor-initializer list is out of order. 1508 // Issue a warning diagnostic. 1509 if (PrevMember->isBaseInitializer()) { 1510 // Diagnostics is for an initialized base class. 1511 Type *BaseClass = PrevMember->getBaseClass(); 1512 Diag(PrevMember->getSourceLocation(), 1513 diag::warn_base_initialized) 1514 << QualType(BaseClass, 0); 1515 } else { 1516 FieldDecl *Field = PrevMember->getMember(); 1517 Diag(PrevMember->getSourceLocation(), 1518 diag::warn_field_initialized) 1519 << Field->getNameAsString(); 1520 } 1521 // Also the note! 1522 if (FieldDecl *Field = Member->getMember()) 1523 Diag(Member->getSourceLocation(), 1524 diag::note_fieldorbase_initialized_here) << 0 1525 << Field->getNameAsString(); 1526 else { 1527 Type *BaseClass = Member->getBaseClass(); 1528 Diag(Member->getSourceLocation(), 1529 diag::note_fieldorbase_initialized_here) << 1 1530 << QualType(BaseClass, 0); 1531 } 1532 for (curIndex = 0; curIndex < Last; curIndex++) 1533 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1534 break; 1535 } 1536 PrevMember = Member; 1537 } 1538} 1539 1540void 1541Sema::computeBaseOrMembersToDestroy(CXXDestructorDecl *Destructor) { 1542 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1543 llvm::SmallVector<uintptr_t, 32> AllToDestruct; 1544 1545 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1546 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1547 if (VBase->getType()->isDependentType()) 1548 continue; 1549 // Skip over virtual bases which have trivial destructors. 1550 CXXRecordDecl *BaseClassDecl 1551 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1552 if (BaseClassDecl->hasTrivialDestructor()) 1553 continue; 1554 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1555 MarkDeclarationReferenced(Destructor->getLocation(), 1556 const_cast<CXXDestructorDecl*>(Dtor)); 1557 1558 uintptr_t Member = 1559 reinterpret_cast<uintptr_t>(VBase->getType().getTypePtr()) 1560 | CXXDestructorDecl::VBASE; 1561 AllToDestruct.push_back(Member); 1562 } 1563 for (CXXRecordDecl::base_class_iterator Base = 1564 ClassDecl->bases_begin(), 1565 E = ClassDecl->bases_end(); Base != E; ++Base) { 1566 if (Base->isVirtual()) 1567 continue; 1568 if (Base->getType()->isDependentType()) 1569 continue; 1570 // Skip over virtual bases which have trivial destructors. 1571 CXXRecordDecl *BaseClassDecl 1572 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1573 if (BaseClassDecl->hasTrivialDestructor()) 1574 continue; 1575 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1576 MarkDeclarationReferenced(Destructor->getLocation(), 1577 const_cast<CXXDestructorDecl*>(Dtor)); 1578 uintptr_t Member = 1579 reinterpret_cast<uintptr_t>(Base->getType().getTypePtr()) 1580 | CXXDestructorDecl::DRCTNONVBASE; 1581 AllToDestruct.push_back(Member); 1582 } 1583 1584 // non-static data members. 1585 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1586 E = ClassDecl->field_end(); Field != E; ++Field) { 1587 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 1588 1589 if (const RecordType* RT = FieldType->getAs<RecordType>()) { 1590 // Skip over virtual bases which have trivial destructors. 1591 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1592 if (FieldClassDecl->hasTrivialDestructor()) 1593 continue; 1594 if (const CXXDestructorDecl *Dtor = 1595 FieldClassDecl->getDestructor(Context)) 1596 MarkDeclarationReferenced(Destructor->getLocation(), 1597 const_cast<CXXDestructorDecl*>(Dtor)); 1598 uintptr_t Member = reinterpret_cast<uintptr_t>(*Field); 1599 AllToDestruct.push_back(Member); 1600 } 1601 } 1602 1603 unsigned NumDestructions = AllToDestruct.size(); 1604 if (NumDestructions > 0) { 1605 Destructor->setNumBaseOrMemberDestructions(NumDestructions); 1606 uintptr_t *BaseOrMemberDestructions = 1607 new (Context) uintptr_t [NumDestructions]; 1608 // Insert in reverse order. 1609 for (int Idx = NumDestructions-1, i=0 ; Idx >= 0; --Idx) 1610 BaseOrMemberDestructions[i++] = AllToDestruct[Idx]; 1611 Destructor->setBaseOrMemberDestructions(BaseOrMemberDestructions); 1612 } 1613} 1614 1615void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1616 if (!CDtorDecl) 1617 return; 1618 1619 AdjustDeclIfTemplate(CDtorDecl); 1620 1621 if (CXXConstructorDecl *Constructor 1622 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1623 BuildBaseOrMemberInitializers(Context, 1624 Constructor, 1625 (CXXBaseOrMemberInitializer **)0, 0); 1626} 1627 1628namespace { 1629 /// PureVirtualMethodCollector - traverses a class and its superclasses 1630 /// and determines if it has any pure virtual methods. 1631 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1632 ASTContext &Context; 1633 1634 public: 1635 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1636 1637 private: 1638 MethodList Methods; 1639 1640 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1641 1642 public: 1643 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1644 : Context(Ctx) { 1645 1646 MethodList List; 1647 Collect(RD, List); 1648 1649 // Copy the temporary list to methods, and make sure to ignore any 1650 // null entries. 1651 for (size_t i = 0, e = List.size(); i != e; ++i) { 1652 if (List[i]) 1653 Methods.push_back(List[i]); 1654 } 1655 } 1656 1657 bool empty() const { return Methods.empty(); } 1658 1659 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1660 MethodList::const_iterator methods_end() { return Methods.end(); } 1661 }; 1662 1663 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1664 MethodList& Methods) { 1665 // First, collect the pure virtual methods for the base classes. 1666 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1667 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1668 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1669 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1670 if (BaseDecl && BaseDecl->isAbstract()) 1671 Collect(BaseDecl, Methods); 1672 } 1673 } 1674 1675 // Next, zero out any pure virtual methods that this class overrides. 1676 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1677 1678 MethodSetTy OverriddenMethods; 1679 size_t MethodsSize = Methods.size(); 1680 1681 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1682 i != e; ++i) { 1683 // Traverse the record, looking for methods. 1684 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1685 // If the method is pure virtual, add it to the methods vector. 1686 if (MD->isPure()) 1687 Methods.push_back(MD); 1688 1689 // Record all the overridden methods in our set. 1690 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1691 E = MD->end_overridden_methods(); I != E; ++I) { 1692 // Keep track of the overridden methods. 1693 OverriddenMethods.insert(*I); 1694 } 1695 } 1696 } 1697 1698 // Now go through the methods and zero out all the ones we know are 1699 // overridden. 1700 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1701 if (OverriddenMethods.count(Methods[i])) 1702 Methods[i] = 0; 1703 } 1704 1705 } 1706} 1707 1708 1709bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1710 unsigned DiagID, AbstractDiagSelID SelID, 1711 const CXXRecordDecl *CurrentRD) { 1712 if (SelID == -1) 1713 return RequireNonAbstractType(Loc, T, 1714 PDiag(DiagID), CurrentRD); 1715 else 1716 return RequireNonAbstractType(Loc, T, 1717 PDiag(DiagID) << SelID, CurrentRD); 1718} 1719 1720bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1721 const PartialDiagnostic &PD, 1722 const CXXRecordDecl *CurrentRD) { 1723 if (!getLangOptions().CPlusPlus) 1724 return false; 1725 1726 if (const ArrayType *AT = Context.getAsArrayType(T)) 1727 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1728 CurrentRD); 1729 1730 if (const PointerType *PT = T->getAs<PointerType>()) { 1731 // Find the innermost pointer type. 1732 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1733 PT = T; 1734 1735 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1736 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1737 } 1738 1739 const RecordType *RT = T->getAs<RecordType>(); 1740 if (!RT) 1741 return false; 1742 1743 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1744 if (!RD) 1745 return false; 1746 1747 if (CurrentRD && CurrentRD != RD) 1748 return false; 1749 1750 if (!RD->isAbstract()) 1751 return false; 1752 1753 Diag(Loc, PD) << RD->getDeclName(); 1754 1755 // Check if we've already emitted the list of pure virtual functions for this 1756 // class. 1757 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1758 return true; 1759 1760 PureVirtualMethodCollector Collector(Context, RD); 1761 1762 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1763 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1764 const CXXMethodDecl *MD = *I; 1765 1766 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1767 MD->getDeclName(); 1768 } 1769 1770 if (!PureVirtualClassDiagSet) 1771 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1772 PureVirtualClassDiagSet->insert(RD); 1773 1774 return true; 1775} 1776 1777namespace { 1778 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1779 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1780 Sema &SemaRef; 1781 CXXRecordDecl *AbstractClass; 1782 1783 bool VisitDeclContext(const DeclContext *DC) { 1784 bool Invalid = false; 1785 1786 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1787 E = DC->decls_end(); I != E; ++I) 1788 Invalid |= Visit(*I); 1789 1790 return Invalid; 1791 } 1792 1793 public: 1794 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1795 : SemaRef(SemaRef), AbstractClass(ac) { 1796 Visit(SemaRef.Context.getTranslationUnitDecl()); 1797 } 1798 1799 bool VisitFunctionDecl(const FunctionDecl *FD) { 1800 if (FD->isThisDeclarationADefinition()) { 1801 // No need to do the check if we're in a definition, because it requires 1802 // that the return/param types are complete. 1803 // because that requires 1804 return VisitDeclContext(FD); 1805 } 1806 1807 // Check the return type. 1808 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1809 bool Invalid = 1810 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1811 diag::err_abstract_type_in_decl, 1812 Sema::AbstractReturnType, 1813 AbstractClass); 1814 1815 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1816 E = FD->param_end(); I != E; ++I) { 1817 const ParmVarDecl *VD = *I; 1818 Invalid |= 1819 SemaRef.RequireNonAbstractType(VD->getLocation(), 1820 VD->getOriginalType(), 1821 diag::err_abstract_type_in_decl, 1822 Sema::AbstractParamType, 1823 AbstractClass); 1824 } 1825 1826 return Invalid; 1827 } 1828 1829 bool VisitDecl(const Decl* D) { 1830 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1831 return VisitDeclContext(DC); 1832 1833 return false; 1834 } 1835 }; 1836} 1837 1838void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1839 DeclPtrTy TagDecl, 1840 SourceLocation LBrac, 1841 SourceLocation RBrac) { 1842 if (!TagDecl) 1843 return; 1844 1845 AdjustDeclIfTemplate(TagDecl); 1846 ActOnFields(S, RLoc, TagDecl, 1847 (DeclPtrTy*)FieldCollector->getCurFields(), 1848 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1849 1850 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1851 if (!RD->isAbstract()) { 1852 // Collect all the pure virtual methods and see if this is an abstract 1853 // class after all. 1854 PureVirtualMethodCollector Collector(Context, RD); 1855 if (!Collector.empty()) 1856 RD->setAbstract(true); 1857 } 1858 1859 if (RD->isAbstract()) 1860 AbstractClassUsageDiagnoser(*this, RD); 1861 1862 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1863 AddImplicitlyDeclaredMembersToClass(RD); 1864} 1865 1866/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1867/// special functions, such as the default constructor, copy 1868/// constructor, or destructor, to the given C++ class (C++ 1869/// [special]p1). This routine can only be executed just before the 1870/// definition of the class is complete. 1871void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1872 CanQualType ClassType 1873 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1874 1875 // FIXME: Implicit declarations have exception specifications, which are 1876 // the union of the specifications of the implicitly called functions. 1877 1878 if (!ClassDecl->hasUserDeclaredConstructor()) { 1879 // C++ [class.ctor]p5: 1880 // A default constructor for a class X is a constructor of class X 1881 // that can be called without an argument. If there is no 1882 // user-declared constructor for class X, a default constructor is 1883 // implicitly declared. An implicitly-declared default constructor 1884 // is an inline public member of its class. 1885 DeclarationName Name 1886 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1887 CXXConstructorDecl *DefaultCon = 1888 CXXConstructorDecl::Create(Context, ClassDecl, 1889 ClassDecl->getLocation(), Name, 1890 Context.getFunctionType(Context.VoidTy, 1891 0, 0, false, 0), 1892 /*DInfo=*/0, 1893 /*isExplicit=*/false, 1894 /*isInline=*/true, 1895 /*isImplicitlyDeclared=*/true); 1896 DefaultCon->setAccess(AS_public); 1897 DefaultCon->setImplicit(); 1898 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1899 ClassDecl->addDecl(DefaultCon); 1900 } 1901 1902 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1903 // C++ [class.copy]p4: 1904 // If the class definition does not explicitly declare a copy 1905 // constructor, one is declared implicitly. 1906 1907 // C++ [class.copy]p5: 1908 // The implicitly-declared copy constructor for a class X will 1909 // have the form 1910 // 1911 // X::X(const X&) 1912 // 1913 // if 1914 bool HasConstCopyConstructor = true; 1915 1916 // -- each direct or virtual base class B of X has a copy 1917 // constructor whose first parameter is of type const B& or 1918 // const volatile B&, and 1919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1920 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1921 const CXXRecordDecl *BaseClassDecl 1922 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1923 HasConstCopyConstructor 1924 = BaseClassDecl->hasConstCopyConstructor(Context); 1925 } 1926 1927 // -- for all the nonstatic data members of X that are of a 1928 // class type M (or array thereof), each such class type 1929 // has a copy constructor whose first parameter is of type 1930 // const M& or const volatile M&. 1931 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1932 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1933 ++Field) { 1934 QualType FieldType = (*Field)->getType(); 1935 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1936 FieldType = Array->getElementType(); 1937 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1938 const CXXRecordDecl *FieldClassDecl 1939 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1940 HasConstCopyConstructor 1941 = FieldClassDecl->hasConstCopyConstructor(Context); 1942 } 1943 } 1944 1945 // Otherwise, the implicitly declared copy constructor will have 1946 // the form 1947 // 1948 // X::X(X&) 1949 QualType ArgType = ClassType; 1950 if (HasConstCopyConstructor) 1951 ArgType = ArgType.withConst(); 1952 ArgType = Context.getLValueReferenceType(ArgType); 1953 1954 // An implicitly-declared copy constructor is an inline public 1955 // member of its class. 1956 DeclarationName Name 1957 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1958 CXXConstructorDecl *CopyConstructor 1959 = CXXConstructorDecl::Create(Context, ClassDecl, 1960 ClassDecl->getLocation(), Name, 1961 Context.getFunctionType(Context.VoidTy, 1962 &ArgType, 1, 1963 false, 0), 1964 /*DInfo=*/0, 1965 /*isExplicit=*/false, 1966 /*isInline=*/true, 1967 /*isImplicitlyDeclared=*/true); 1968 CopyConstructor->setAccess(AS_public); 1969 CopyConstructor->setImplicit(); 1970 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1971 1972 // Add the parameter to the constructor. 1973 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1974 ClassDecl->getLocation(), 1975 /*IdentifierInfo=*/0, 1976 ArgType, /*DInfo=*/0, 1977 VarDecl::None, 0); 1978 CopyConstructor->setParams(Context, &FromParam, 1); 1979 ClassDecl->addDecl(CopyConstructor); 1980 } 1981 1982 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1983 // Note: The following rules are largely analoguous to the copy 1984 // constructor rules. Note that virtual bases are not taken into account 1985 // for determining the argument type of the operator. Note also that 1986 // operators taking an object instead of a reference are allowed. 1987 // 1988 // C++ [class.copy]p10: 1989 // If the class definition does not explicitly declare a copy 1990 // assignment operator, one is declared implicitly. 1991 // The implicitly-defined copy assignment operator for a class X 1992 // will have the form 1993 // 1994 // X& X::operator=(const X&) 1995 // 1996 // if 1997 bool HasConstCopyAssignment = true; 1998 1999 // -- each direct base class B of X has a copy assignment operator 2000 // whose parameter is of type const B&, const volatile B& or B, 2001 // and 2002 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2003 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2004 assert(!Base->getType()->isDependentType() && 2005 "Cannot generate implicit members for class with dependent bases."); 2006 const CXXRecordDecl *BaseClassDecl 2007 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2008 const CXXMethodDecl *MD = 0; 2009 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2010 MD); 2011 } 2012 2013 // -- for all the nonstatic data members of X that are of a class 2014 // type M (or array thereof), each such class type has a copy 2015 // assignment operator whose parameter is of type const M&, 2016 // const volatile M& or M. 2017 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2018 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2019 ++Field) { 2020 QualType FieldType = (*Field)->getType(); 2021 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2022 FieldType = Array->getElementType(); 2023 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2024 const CXXRecordDecl *FieldClassDecl 2025 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2026 const CXXMethodDecl *MD = 0; 2027 HasConstCopyAssignment 2028 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2029 } 2030 } 2031 2032 // Otherwise, the implicitly declared copy assignment operator will 2033 // have the form 2034 // 2035 // X& X::operator=(X&) 2036 QualType ArgType = ClassType; 2037 QualType RetType = Context.getLValueReferenceType(ArgType); 2038 if (HasConstCopyAssignment) 2039 ArgType = ArgType.withConst(); 2040 ArgType = Context.getLValueReferenceType(ArgType); 2041 2042 // An implicitly-declared copy assignment operator is an inline public 2043 // member of its class. 2044 DeclarationName Name = 2045 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2046 CXXMethodDecl *CopyAssignment = 2047 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2048 Context.getFunctionType(RetType, &ArgType, 1, 2049 false, 0), 2050 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2051 CopyAssignment->setAccess(AS_public); 2052 CopyAssignment->setImplicit(); 2053 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2054 CopyAssignment->setCopyAssignment(true); 2055 2056 // Add the parameter to the operator. 2057 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2058 ClassDecl->getLocation(), 2059 /*IdentifierInfo=*/0, 2060 ArgType, /*DInfo=*/0, 2061 VarDecl::None, 0); 2062 CopyAssignment->setParams(Context, &FromParam, 1); 2063 2064 // Don't call addedAssignmentOperator. There is no way to distinguish an 2065 // implicit from an explicit assignment operator. 2066 ClassDecl->addDecl(CopyAssignment); 2067 } 2068 2069 if (!ClassDecl->hasUserDeclaredDestructor()) { 2070 // C++ [class.dtor]p2: 2071 // If a class has no user-declared destructor, a destructor is 2072 // declared implicitly. An implicitly-declared destructor is an 2073 // inline public member of its class. 2074 DeclarationName Name 2075 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2076 CXXDestructorDecl *Destructor 2077 = CXXDestructorDecl::Create(Context, ClassDecl, 2078 ClassDecl->getLocation(), Name, 2079 Context.getFunctionType(Context.VoidTy, 2080 0, 0, false, 0), 2081 /*isInline=*/true, 2082 /*isImplicitlyDeclared=*/true); 2083 Destructor->setAccess(AS_public); 2084 Destructor->setImplicit(); 2085 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2086 ClassDecl->addDecl(Destructor); 2087 } 2088} 2089 2090void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2091 Decl *D = TemplateD.getAs<Decl>(); 2092 if (!D) 2093 return; 2094 2095 TemplateParameterList *Params = 0; 2096 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2097 Params = Template->getTemplateParameters(); 2098 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2099 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2100 Params = PartialSpec->getTemplateParameters(); 2101 else 2102 return; 2103 2104 for (TemplateParameterList::iterator Param = Params->begin(), 2105 ParamEnd = Params->end(); 2106 Param != ParamEnd; ++Param) { 2107 NamedDecl *Named = cast<NamedDecl>(*Param); 2108 if (Named->getDeclName()) { 2109 S->AddDecl(DeclPtrTy::make(Named)); 2110 IdResolver.AddDecl(Named); 2111 } 2112 } 2113} 2114 2115/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2116/// parsing a top-level (non-nested) C++ class, and we are now 2117/// parsing those parts of the given Method declaration that could 2118/// not be parsed earlier (C++ [class.mem]p2), such as default 2119/// arguments. This action should enter the scope of the given 2120/// Method declaration as if we had just parsed the qualified method 2121/// name. However, it should not bring the parameters into scope; 2122/// that will be performed by ActOnDelayedCXXMethodParameter. 2123void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2124 if (!MethodD) 2125 return; 2126 2127 AdjustDeclIfTemplate(MethodD); 2128 2129 CXXScopeSpec SS; 2130 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2131 QualType ClassTy 2132 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2133 SS.setScopeRep( 2134 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2135 ActOnCXXEnterDeclaratorScope(S, SS); 2136} 2137 2138/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2139/// C++ method declaration. We're (re-)introducing the given 2140/// function parameter into scope for use in parsing later parts of 2141/// the method declaration. For example, we could see an 2142/// ActOnParamDefaultArgument event for this parameter. 2143void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2144 if (!ParamD) 2145 return; 2146 2147 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2148 2149 // If this parameter has an unparsed default argument, clear it out 2150 // to make way for the parsed default argument. 2151 if (Param->hasUnparsedDefaultArg()) 2152 Param->setDefaultArg(0); 2153 2154 S->AddDecl(DeclPtrTy::make(Param)); 2155 if (Param->getDeclName()) 2156 IdResolver.AddDecl(Param); 2157} 2158 2159/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2160/// processing the delayed method declaration for Method. The method 2161/// declaration is now considered finished. There may be a separate 2162/// ActOnStartOfFunctionDef action later (not necessarily 2163/// immediately!) for this method, if it was also defined inside the 2164/// class body. 2165void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2166 if (!MethodD) 2167 return; 2168 2169 AdjustDeclIfTemplate(MethodD); 2170 2171 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2172 CXXScopeSpec SS; 2173 QualType ClassTy 2174 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2175 SS.setScopeRep( 2176 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2177 ActOnCXXExitDeclaratorScope(S, SS); 2178 2179 // Now that we have our default arguments, check the constructor 2180 // again. It could produce additional diagnostics or affect whether 2181 // the class has implicitly-declared destructors, among other 2182 // things. 2183 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2184 CheckConstructor(Constructor); 2185 2186 // Check the default arguments, which we may have added. 2187 if (!Method->isInvalidDecl()) 2188 CheckCXXDefaultArguments(Method); 2189} 2190 2191/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2192/// the well-formedness of the constructor declarator @p D with type @p 2193/// R. If there are any errors in the declarator, this routine will 2194/// emit diagnostics and set the invalid bit to true. In any case, the type 2195/// will be updated to reflect a well-formed type for the constructor and 2196/// returned. 2197QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2198 FunctionDecl::StorageClass &SC) { 2199 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2200 2201 // C++ [class.ctor]p3: 2202 // A constructor shall not be virtual (10.3) or static (9.4). A 2203 // constructor can be invoked for a const, volatile or const 2204 // volatile object. A constructor shall not be declared const, 2205 // volatile, or const volatile (9.3.2). 2206 if (isVirtual) { 2207 if (!D.isInvalidType()) 2208 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2209 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2210 << SourceRange(D.getIdentifierLoc()); 2211 D.setInvalidType(); 2212 } 2213 if (SC == FunctionDecl::Static) { 2214 if (!D.isInvalidType()) 2215 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2216 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2217 << SourceRange(D.getIdentifierLoc()); 2218 D.setInvalidType(); 2219 SC = FunctionDecl::None; 2220 } 2221 2222 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2223 if (FTI.TypeQuals != 0) { 2224 if (FTI.TypeQuals & Qualifiers::Const) 2225 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2226 << "const" << SourceRange(D.getIdentifierLoc()); 2227 if (FTI.TypeQuals & Qualifiers::Volatile) 2228 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2229 << "volatile" << SourceRange(D.getIdentifierLoc()); 2230 if (FTI.TypeQuals & Qualifiers::Restrict) 2231 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2232 << "restrict" << SourceRange(D.getIdentifierLoc()); 2233 } 2234 2235 // Rebuild the function type "R" without any type qualifiers (in 2236 // case any of the errors above fired) and with "void" as the 2237 // return type, since constructors don't have return types. We 2238 // *always* have to do this, because GetTypeForDeclarator will 2239 // put in a result type of "int" when none was specified. 2240 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2241 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2242 Proto->getNumArgs(), 2243 Proto->isVariadic(), 0); 2244} 2245 2246/// CheckConstructor - Checks a fully-formed constructor for 2247/// well-formedness, issuing any diagnostics required. Returns true if 2248/// the constructor declarator is invalid. 2249void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2250 CXXRecordDecl *ClassDecl 2251 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2252 if (!ClassDecl) 2253 return Constructor->setInvalidDecl(); 2254 2255 // C++ [class.copy]p3: 2256 // A declaration of a constructor for a class X is ill-formed if 2257 // its first parameter is of type (optionally cv-qualified) X and 2258 // either there are no other parameters or else all other 2259 // parameters have default arguments. 2260 if (!Constructor->isInvalidDecl() && 2261 ((Constructor->getNumParams() == 1) || 2262 (Constructor->getNumParams() > 1 && 2263 Constructor->getParamDecl(1)->hasDefaultArg()))) { 2264 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2265 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2266 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2267 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2268 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2269 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2270 Constructor->setInvalidDecl(); 2271 } 2272 } 2273 2274 // Notify the class that we've added a constructor. 2275 ClassDecl->addedConstructor(Context, Constructor); 2276} 2277 2278static inline bool 2279FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2280 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2281 FTI.ArgInfo[0].Param && 2282 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2283} 2284 2285/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2286/// the well-formednes of the destructor declarator @p D with type @p 2287/// R. If there are any errors in the declarator, this routine will 2288/// emit diagnostics and set the declarator to invalid. Even if this happens, 2289/// will be updated to reflect a well-formed type for the destructor and 2290/// returned. 2291QualType Sema::CheckDestructorDeclarator(Declarator &D, 2292 FunctionDecl::StorageClass& SC) { 2293 // C++ [class.dtor]p1: 2294 // [...] A typedef-name that names a class is a class-name 2295 // (7.1.3); however, a typedef-name that names a class shall not 2296 // be used as the identifier in the declarator for a destructor 2297 // declaration. 2298 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2299 if (isa<TypedefType>(DeclaratorType)) { 2300 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2301 << DeclaratorType; 2302 D.setInvalidType(); 2303 } 2304 2305 // C++ [class.dtor]p2: 2306 // A destructor is used to destroy objects of its class type. A 2307 // destructor takes no parameters, and no return type can be 2308 // specified for it (not even void). The address of a destructor 2309 // shall not be taken. A destructor shall not be static. A 2310 // destructor can be invoked for a const, volatile or const 2311 // volatile object. A destructor shall not be declared const, 2312 // volatile or const volatile (9.3.2). 2313 if (SC == FunctionDecl::Static) { 2314 if (!D.isInvalidType()) 2315 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2316 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2317 << SourceRange(D.getIdentifierLoc()); 2318 SC = FunctionDecl::None; 2319 D.setInvalidType(); 2320 } 2321 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2322 // Destructors don't have return types, but the parser will 2323 // happily parse something like: 2324 // 2325 // class X { 2326 // float ~X(); 2327 // }; 2328 // 2329 // The return type will be eliminated later. 2330 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2331 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2332 << SourceRange(D.getIdentifierLoc()); 2333 } 2334 2335 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2336 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2337 if (FTI.TypeQuals & Qualifiers::Const) 2338 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2339 << "const" << SourceRange(D.getIdentifierLoc()); 2340 if (FTI.TypeQuals & Qualifiers::Volatile) 2341 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2342 << "volatile" << SourceRange(D.getIdentifierLoc()); 2343 if (FTI.TypeQuals & Qualifiers::Restrict) 2344 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2345 << "restrict" << SourceRange(D.getIdentifierLoc()); 2346 D.setInvalidType(); 2347 } 2348 2349 // Make sure we don't have any parameters. 2350 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2351 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2352 2353 // Delete the parameters. 2354 FTI.freeArgs(); 2355 D.setInvalidType(); 2356 } 2357 2358 // Make sure the destructor isn't variadic. 2359 if (FTI.isVariadic) { 2360 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2361 D.setInvalidType(); 2362 } 2363 2364 // Rebuild the function type "R" without any type qualifiers or 2365 // parameters (in case any of the errors above fired) and with 2366 // "void" as the return type, since destructors don't have return 2367 // types. We *always* have to do this, because GetTypeForDeclarator 2368 // will put in a result type of "int" when none was specified. 2369 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2370} 2371 2372/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2373/// well-formednes of the conversion function declarator @p D with 2374/// type @p R. If there are any errors in the declarator, this routine 2375/// will emit diagnostics and return true. Otherwise, it will return 2376/// false. Either way, the type @p R will be updated to reflect a 2377/// well-formed type for the conversion operator. 2378void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2379 FunctionDecl::StorageClass& SC) { 2380 // C++ [class.conv.fct]p1: 2381 // Neither parameter types nor return type can be specified. The 2382 // type of a conversion function (8.3.5) is "function taking no 2383 // parameter returning conversion-type-id." 2384 if (SC == FunctionDecl::Static) { 2385 if (!D.isInvalidType()) 2386 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2387 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2388 << SourceRange(D.getIdentifierLoc()); 2389 D.setInvalidType(); 2390 SC = FunctionDecl::None; 2391 } 2392 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2393 // Conversion functions don't have return types, but the parser will 2394 // happily parse something like: 2395 // 2396 // class X { 2397 // float operator bool(); 2398 // }; 2399 // 2400 // The return type will be changed later anyway. 2401 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2402 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2403 << SourceRange(D.getIdentifierLoc()); 2404 } 2405 2406 // Make sure we don't have any parameters. 2407 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2408 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2409 2410 // Delete the parameters. 2411 D.getTypeObject(0).Fun.freeArgs(); 2412 D.setInvalidType(); 2413 } 2414 2415 // Make sure the conversion function isn't variadic. 2416 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2417 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2418 D.setInvalidType(); 2419 } 2420 2421 // C++ [class.conv.fct]p4: 2422 // The conversion-type-id shall not represent a function type nor 2423 // an array type. 2424 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2425 if (ConvType->isArrayType()) { 2426 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2427 ConvType = Context.getPointerType(ConvType); 2428 D.setInvalidType(); 2429 } else if (ConvType->isFunctionType()) { 2430 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2431 ConvType = Context.getPointerType(ConvType); 2432 D.setInvalidType(); 2433 } 2434 2435 // Rebuild the function type "R" without any parameters (in case any 2436 // of the errors above fired) and with the conversion type as the 2437 // return type. 2438 R = Context.getFunctionType(ConvType, 0, 0, false, 2439 R->getAs<FunctionProtoType>()->getTypeQuals()); 2440 2441 // C++0x explicit conversion operators. 2442 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2443 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2444 diag::warn_explicit_conversion_functions) 2445 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2446} 2447 2448/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2449/// the declaration of the given C++ conversion function. This routine 2450/// is responsible for recording the conversion function in the C++ 2451/// class, if possible. 2452Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2453 assert(Conversion && "Expected to receive a conversion function declaration"); 2454 2455 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2456 2457 // Make sure we aren't redeclaring the conversion function. 2458 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2459 2460 // C++ [class.conv.fct]p1: 2461 // [...] A conversion function is never used to convert a 2462 // (possibly cv-qualified) object to the (possibly cv-qualified) 2463 // same object type (or a reference to it), to a (possibly 2464 // cv-qualified) base class of that type (or a reference to it), 2465 // or to (possibly cv-qualified) void. 2466 // FIXME: Suppress this warning if the conversion function ends up being a 2467 // virtual function that overrides a virtual function in a base class. 2468 QualType ClassType 2469 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2470 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2471 ConvType = ConvTypeRef->getPointeeType(); 2472 if (ConvType->isRecordType()) { 2473 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2474 if (ConvType == ClassType) 2475 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2476 << ClassType; 2477 else if (IsDerivedFrom(ClassType, ConvType)) 2478 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2479 << ClassType << ConvType; 2480 } else if (ConvType->isVoidType()) { 2481 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2482 << ClassType << ConvType; 2483 } 2484 2485 if (Conversion->getPreviousDeclaration()) { 2486 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2487 if (FunctionTemplateDecl *ConversionTemplate 2488 = Conversion->getDescribedFunctionTemplate()) 2489 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2490 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2491 for (OverloadedFunctionDecl::function_iterator 2492 Conv = Conversions->function_begin(), 2493 ConvEnd = Conversions->function_end(); 2494 Conv != ConvEnd; ++Conv) { 2495 if (*Conv == ExpectedPrevDecl) { 2496 *Conv = Conversion; 2497 return DeclPtrTy::make(Conversion); 2498 } 2499 } 2500 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2501 } else if (FunctionTemplateDecl *ConversionTemplate 2502 = Conversion->getDescribedFunctionTemplate()) 2503 ClassDecl->addConversionFunction(ConversionTemplate); 2504 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2505 ClassDecl->addConversionFunction(Conversion); 2506 2507 return DeclPtrTy::make(Conversion); 2508} 2509 2510//===----------------------------------------------------------------------===// 2511// Namespace Handling 2512//===----------------------------------------------------------------------===// 2513 2514/// ActOnStartNamespaceDef - This is called at the start of a namespace 2515/// definition. 2516Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2517 SourceLocation IdentLoc, 2518 IdentifierInfo *II, 2519 SourceLocation LBrace) { 2520 NamespaceDecl *Namespc = 2521 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2522 Namespc->setLBracLoc(LBrace); 2523 2524 Scope *DeclRegionScope = NamespcScope->getParent(); 2525 2526 if (II) { 2527 // C++ [namespace.def]p2: 2528 // The identifier in an original-namespace-definition shall not have been 2529 // previously defined in the declarative region in which the 2530 // original-namespace-definition appears. The identifier in an 2531 // original-namespace-definition is the name of the namespace. Subsequently 2532 // in that declarative region, it is treated as an original-namespace-name. 2533 2534 NamedDecl *PrevDecl 2535 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, true); 2536 2537 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2538 // This is an extended namespace definition. 2539 // Attach this namespace decl to the chain of extended namespace 2540 // definitions. 2541 OrigNS->setNextNamespace(Namespc); 2542 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2543 2544 // Remove the previous declaration from the scope. 2545 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2546 IdResolver.RemoveDecl(OrigNS); 2547 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2548 } 2549 } else if (PrevDecl) { 2550 // This is an invalid name redefinition. 2551 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2552 << Namespc->getDeclName(); 2553 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2554 Namespc->setInvalidDecl(); 2555 // Continue on to push Namespc as current DeclContext and return it. 2556 } else if (II->isStr("std") && 2557 CurContext->getLookupContext()->isTranslationUnit()) { 2558 // This is the first "real" definition of the namespace "std", so update 2559 // our cache of the "std" namespace to point at this definition. 2560 if (StdNamespace) { 2561 // We had already defined a dummy namespace "std". Link this new 2562 // namespace definition to the dummy namespace "std". 2563 StdNamespace->setNextNamespace(Namespc); 2564 StdNamespace->setLocation(IdentLoc); 2565 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2566 } 2567 2568 // Make our StdNamespace cache point at the first real definition of the 2569 // "std" namespace. 2570 StdNamespace = Namespc; 2571 } 2572 2573 PushOnScopeChains(Namespc, DeclRegionScope); 2574 } else { 2575 // Anonymous namespaces. 2576 2577 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2578 // behaves as if it were replaced by 2579 // namespace unique { /* empty body */ } 2580 // using namespace unique; 2581 // namespace unique { namespace-body } 2582 // where all occurrences of 'unique' in a translation unit are 2583 // replaced by the same identifier and this identifier differs 2584 // from all other identifiers in the entire program. 2585 2586 // We just create the namespace with an empty name and then add an 2587 // implicit using declaration, just like the standard suggests. 2588 // 2589 // CodeGen enforces the "universally unique" aspect by giving all 2590 // declarations semantically contained within an anonymous 2591 // namespace internal linkage. 2592 2593 assert(Namespc->isAnonymousNamespace()); 2594 CurContext->addDecl(Namespc); 2595 2596 UsingDirectiveDecl* UD 2597 = UsingDirectiveDecl::Create(Context, CurContext, 2598 /* 'using' */ LBrace, 2599 /* 'namespace' */ SourceLocation(), 2600 /* qualifier */ SourceRange(), 2601 /* NNS */ NULL, 2602 /* identifier */ SourceLocation(), 2603 Namespc, 2604 /* Ancestor */ CurContext); 2605 UD->setImplicit(); 2606 CurContext->addDecl(UD); 2607 } 2608 2609 // Although we could have an invalid decl (i.e. the namespace name is a 2610 // redefinition), push it as current DeclContext and try to continue parsing. 2611 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2612 // for the namespace has the declarations that showed up in that particular 2613 // namespace definition. 2614 PushDeclContext(NamespcScope, Namespc); 2615 return DeclPtrTy::make(Namespc); 2616} 2617 2618/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2619/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2620void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2621 Decl *Dcl = D.getAs<Decl>(); 2622 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2623 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2624 Namespc->setRBracLoc(RBrace); 2625 PopDeclContext(); 2626} 2627 2628Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2629 SourceLocation UsingLoc, 2630 SourceLocation NamespcLoc, 2631 const CXXScopeSpec &SS, 2632 SourceLocation IdentLoc, 2633 IdentifierInfo *NamespcName, 2634 AttributeList *AttrList) { 2635 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2636 assert(NamespcName && "Invalid NamespcName."); 2637 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2638 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2639 2640 UsingDirectiveDecl *UDir = 0; 2641 2642 // Lookup namespace name. 2643 LookupResult R; 2644 LookupParsedName(R, S, &SS, NamespcName, LookupNamespaceName, false); 2645 if (R.isAmbiguous()) { 2646 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2647 return DeclPtrTy(); 2648 } 2649 if (!R.empty()) { 2650 NamedDecl *NS = R.getFoundDecl(); 2651 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2652 // C++ [namespace.udir]p1: 2653 // A using-directive specifies that the names in the nominated 2654 // namespace can be used in the scope in which the 2655 // using-directive appears after the using-directive. During 2656 // unqualified name lookup (3.4.1), the names appear as if they 2657 // were declared in the nearest enclosing namespace which 2658 // contains both the using-directive and the nominated 2659 // namespace. [Note: in this context, "contains" means "contains 2660 // directly or indirectly". ] 2661 2662 // Find enclosing context containing both using-directive and 2663 // nominated namespace. 2664 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2665 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2666 CommonAncestor = CommonAncestor->getParent(); 2667 2668 UDir = UsingDirectiveDecl::Create(Context, 2669 CurContext, UsingLoc, 2670 NamespcLoc, 2671 SS.getRange(), 2672 (NestedNameSpecifier *)SS.getScopeRep(), 2673 IdentLoc, 2674 cast<NamespaceDecl>(NS), 2675 CommonAncestor); 2676 PushUsingDirective(S, UDir); 2677 } else { 2678 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2679 } 2680 2681 // FIXME: We ignore attributes for now. 2682 delete AttrList; 2683 return DeclPtrTy::make(UDir); 2684} 2685 2686void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2687 // If scope has associated entity, then using directive is at namespace 2688 // or translation unit scope. We add UsingDirectiveDecls, into 2689 // it's lookup structure. 2690 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2691 Ctx->addDecl(UDir); 2692 else 2693 // Otherwise it is block-sope. using-directives will affect lookup 2694 // only to the end of scope. 2695 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2696} 2697 2698 2699Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2700 AccessSpecifier AS, 2701 SourceLocation UsingLoc, 2702 const CXXScopeSpec &SS, 2703 SourceLocation IdentLoc, 2704 IdentifierInfo *TargetName, 2705 OverloadedOperatorKind Op, 2706 AttributeList *AttrList, 2707 bool IsTypeName) { 2708 assert((TargetName || Op) && "Invalid TargetName."); 2709 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2710 2711 DeclarationName Name; 2712 if (TargetName) 2713 Name = TargetName; 2714 else 2715 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2716 2717 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, IdentLoc, 2718 Name, AttrList, IsTypeName); 2719 if (UD) { 2720 PushOnScopeChains(UD, S); 2721 UD->setAccess(AS); 2722 } 2723 2724 return DeclPtrTy::make(UD); 2725} 2726 2727NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2728 const CXXScopeSpec &SS, 2729 SourceLocation IdentLoc, 2730 DeclarationName Name, 2731 AttributeList *AttrList, 2732 bool IsTypeName) { 2733 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2734 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2735 2736 // FIXME: We ignore attributes for now. 2737 delete AttrList; 2738 2739 if (SS.isEmpty()) { 2740 Diag(IdentLoc, diag::err_using_requires_qualname); 2741 return 0; 2742 } 2743 2744 NestedNameSpecifier *NNS = 2745 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2746 2747 if (isUnknownSpecialization(SS)) { 2748 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2749 SS.getRange(), NNS, 2750 IdentLoc, Name, IsTypeName); 2751 } 2752 2753 DeclContext *LookupContext = 0; 2754 2755 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2756 // C++0x N2914 [namespace.udecl]p3: 2757 // A using-declaration used as a member-declaration shall refer to a member 2758 // of a base class of the class being defined, shall refer to a member of an 2759 // anonymous union that is a member of a base class of the class being 2760 // defined, or shall refer to an enumerator for an enumeration type that is 2761 // a member of a base class of the class being defined. 2762 const Type *Ty = NNS->getAsType(); 2763 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) { 2764 Diag(SS.getRange().getBegin(), 2765 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2766 << NNS << RD->getDeclName(); 2767 return 0; 2768 } 2769 2770 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0)); 2771 LookupContext = BaseTy->getAs<RecordType>()->getDecl(); 2772 } else { 2773 // C++0x N2914 [namespace.udecl]p8: 2774 // A using-declaration for a class member shall be a member-declaration. 2775 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) { 2776 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2777 << SS.getRange(); 2778 return 0; 2779 } 2780 2781 // C++0x N2914 [namespace.udecl]p9: 2782 // In a using-declaration, a prefix :: refers to the global namespace. 2783 if (NNS->getKind() == NestedNameSpecifier::Global) 2784 LookupContext = Context.getTranslationUnitDecl(); 2785 else 2786 LookupContext = NNS->getAsNamespace(); 2787 } 2788 2789 2790 // Lookup target name. 2791 LookupResult R; 2792 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName); 2793 2794 if (R.empty()) { 2795 Diag(IdentLoc, diag::err_no_member) 2796 << Name << LookupContext << SS.getRange(); 2797 return 0; 2798 } 2799 2800 // FIXME: handle ambiguity? 2801 NamedDecl *ND = R.getAsSingleDecl(Context); 2802 2803 if (IsTypeName && !isa<TypeDecl>(ND)) { 2804 Diag(IdentLoc, diag::err_using_typename_non_type); 2805 return 0; 2806 } 2807 2808 // C++0x N2914 [namespace.udecl]p6: 2809 // A using-declaration shall not name a namespace. 2810 if (isa<NamespaceDecl>(ND)) { 2811 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2812 << SS.getRange(); 2813 return 0; 2814 } 2815 2816 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2817 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2818} 2819 2820/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2821/// is a namespace alias, returns the namespace it points to. 2822static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2823 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2824 return AD->getNamespace(); 2825 return dyn_cast_or_null<NamespaceDecl>(D); 2826} 2827 2828Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2829 SourceLocation NamespaceLoc, 2830 SourceLocation AliasLoc, 2831 IdentifierInfo *Alias, 2832 const CXXScopeSpec &SS, 2833 SourceLocation IdentLoc, 2834 IdentifierInfo *Ident) { 2835 2836 // Lookup the namespace name. 2837 LookupResult R; 2838 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false); 2839 2840 // Check if we have a previous declaration with the same name. 2841 if (NamedDecl *PrevDecl 2842 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) { 2843 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2844 // We already have an alias with the same name that points to the same 2845 // namespace, so don't create a new one. 2846 if (!R.isAmbiguous() && !R.empty() && 2847 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 2848 return DeclPtrTy(); 2849 } 2850 2851 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2852 diag::err_redefinition_different_kind; 2853 Diag(AliasLoc, DiagID) << Alias; 2854 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2855 return DeclPtrTy(); 2856 } 2857 2858 if (R.isAmbiguous()) { 2859 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2860 return DeclPtrTy(); 2861 } 2862 2863 if (R.empty()) { 2864 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2865 return DeclPtrTy(); 2866 } 2867 2868 NamespaceAliasDecl *AliasDecl = 2869 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2870 Alias, SS.getRange(), 2871 (NestedNameSpecifier *)SS.getScopeRep(), 2872 IdentLoc, R.getFoundDecl()); 2873 2874 CurContext->addDecl(AliasDecl); 2875 return DeclPtrTy::make(AliasDecl); 2876} 2877 2878void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2879 CXXConstructorDecl *Constructor) { 2880 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2881 !Constructor->isUsed()) && 2882 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2883 2884 CXXRecordDecl *ClassDecl 2885 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2886 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2887 // Before the implicitly-declared default constructor for a class is 2888 // implicitly defined, all the implicitly-declared default constructors 2889 // for its base class and its non-static data members shall have been 2890 // implicitly defined. 2891 bool err = false; 2892 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2893 E = ClassDecl->bases_end(); Base != E; ++Base) { 2894 CXXRecordDecl *BaseClassDecl 2895 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2896 if (!BaseClassDecl->hasTrivialConstructor()) { 2897 if (CXXConstructorDecl *BaseCtor = 2898 BaseClassDecl->getDefaultConstructor(Context)) 2899 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2900 else { 2901 Diag(CurrentLocation, diag::err_defining_default_ctor) 2902 << Context.getTagDeclType(ClassDecl) << 0 2903 << Context.getTagDeclType(BaseClassDecl); 2904 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2905 << Context.getTagDeclType(BaseClassDecl); 2906 err = true; 2907 } 2908 } 2909 } 2910 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2911 E = ClassDecl->field_end(); Field != E; ++Field) { 2912 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2913 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2914 FieldType = Array->getElementType(); 2915 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2916 CXXRecordDecl *FieldClassDecl 2917 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2918 if (!FieldClassDecl->hasTrivialConstructor()) { 2919 if (CXXConstructorDecl *FieldCtor = 2920 FieldClassDecl->getDefaultConstructor(Context)) 2921 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2922 else { 2923 Diag(CurrentLocation, diag::err_defining_default_ctor) 2924 << Context.getTagDeclType(ClassDecl) << 1 << 2925 Context.getTagDeclType(FieldClassDecl); 2926 Diag((*Field)->getLocation(), diag::note_field_decl); 2927 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2928 << Context.getTagDeclType(FieldClassDecl); 2929 err = true; 2930 } 2931 } 2932 } else if (FieldType->isReferenceType()) { 2933 Diag(CurrentLocation, diag::err_unintialized_member) 2934 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2935 Diag((*Field)->getLocation(), diag::note_declared_at); 2936 err = true; 2937 } else if (FieldType.isConstQualified()) { 2938 Diag(CurrentLocation, diag::err_unintialized_member) 2939 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2940 Diag((*Field)->getLocation(), diag::note_declared_at); 2941 err = true; 2942 } 2943 } 2944 if (!err) 2945 Constructor->setUsed(); 2946 else 2947 Constructor->setInvalidDecl(); 2948} 2949 2950void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2951 CXXDestructorDecl *Destructor) { 2952 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2953 "DefineImplicitDestructor - call it for implicit default dtor"); 2954 2955 CXXRecordDecl *ClassDecl 2956 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2957 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2958 // C++ [class.dtor] p5 2959 // Before the implicitly-declared default destructor for a class is 2960 // implicitly defined, all the implicitly-declared default destructors 2961 // for its base class and its non-static data members shall have been 2962 // implicitly defined. 2963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2964 E = ClassDecl->bases_end(); Base != E; ++Base) { 2965 CXXRecordDecl *BaseClassDecl 2966 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2967 if (!BaseClassDecl->hasTrivialDestructor()) { 2968 if (CXXDestructorDecl *BaseDtor = 2969 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2970 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2971 else 2972 assert(false && 2973 "DefineImplicitDestructor - missing dtor in a base class"); 2974 } 2975 } 2976 2977 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2978 E = ClassDecl->field_end(); Field != E; ++Field) { 2979 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2980 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2981 FieldType = Array->getElementType(); 2982 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2983 CXXRecordDecl *FieldClassDecl 2984 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2985 if (!FieldClassDecl->hasTrivialDestructor()) { 2986 if (CXXDestructorDecl *FieldDtor = 2987 const_cast<CXXDestructorDecl*>( 2988 FieldClassDecl->getDestructor(Context))) 2989 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2990 else 2991 assert(false && 2992 "DefineImplicitDestructor - missing dtor in class of a data member"); 2993 } 2994 } 2995 } 2996 Destructor->setUsed(); 2997} 2998 2999void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3000 CXXMethodDecl *MethodDecl) { 3001 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3002 MethodDecl->getOverloadedOperator() == OO_Equal && 3003 !MethodDecl->isUsed()) && 3004 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3005 3006 CXXRecordDecl *ClassDecl 3007 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3008 3009 // C++[class.copy] p12 3010 // Before the implicitly-declared copy assignment operator for a class is 3011 // implicitly defined, all implicitly-declared copy assignment operators 3012 // for its direct base classes and its nonstatic data members shall have 3013 // been implicitly defined. 3014 bool err = false; 3015 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3016 E = ClassDecl->bases_end(); Base != E; ++Base) { 3017 CXXRecordDecl *BaseClassDecl 3018 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3019 if (CXXMethodDecl *BaseAssignOpMethod = 3020 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3021 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3022 } 3023 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3024 E = ClassDecl->field_end(); Field != E; ++Field) { 3025 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3026 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3027 FieldType = Array->getElementType(); 3028 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3029 CXXRecordDecl *FieldClassDecl 3030 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3031 if (CXXMethodDecl *FieldAssignOpMethod = 3032 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3033 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3034 } else if (FieldType->isReferenceType()) { 3035 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3036 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3037 Diag(Field->getLocation(), diag::note_declared_at); 3038 Diag(CurrentLocation, diag::note_first_required_here); 3039 err = true; 3040 } else if (FieldType.isConstQualified()) { 3041 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3042 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3043 Diag(Field->getLocation(), diag::note_declared_at); 3044 Diag(CurrentLocation, diag::note_first_required_here); 3045 err = true; 3046 } 3047 } 3048 if (!err) 3049 MethodDecl->setUsed(); 3050} 3051 3052CXXMethodDecl * 3053Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3054 CXXRecordDecl *ClassDecl) { 3055 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3056 QualType RHSType(LHSType); 3057 // If class's assignment operator argument is const/volatile qualified, 3058 // look for operator = (const/volatile B&). Otherwise, look for 3059 // operator = (B&). 3060 RHSType = Context.getCVRQualifiedType(RHSType, 3061 ParmDecl->getType().getCVRQualifiers()); 3062 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3063 LHSType, 3064 SourceLocation())); 3065 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3066 RHSType, 3067 SourceLocation())); 3068 Expr *Args[2] = { &*LHS, &*RHS }; 3069 OverloadCandidateSet CandidateSet; 3070 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3071 CandidateSet); 3072 OverloadCandidateSet::iterator Best; 3073 if (BestViableFunction(CandidateSet, 3074 ClassDecl->getLocation(), Best) == OR_Success) 3075 return cast<CXXMethodDecl>(Best->Function); 3076 assert(false && 3077 "getAssignOperatorMethod - copy assignment operator method not found"); 3078 return 0; 3079} 3080 3081void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3082 CXXConstructorDecl *CopyConstructor, 3083 unsigned TypeQuals) { 3084 assert((CopyConstructor->isImplicit() && 3085 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3086 !CopyConstructor->isUsed()) && 3087 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3088 3089 CXXRecordDecl *ClassDecl 3090 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3091 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3092 // C++ [class.copy] p209 3093 // Before the implicitly-declared copy constructor for a class is 3094 // implicitly defined, all the implicitly-declared copy constructors 3095 // for its base class and its non-static data members shall have been 3096 // implicitly defined. 3097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3098 Base != ClassDecl->bases_end(); ++Base) { 3099 CXXRecordDecl *BaseClassDecl 3100 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3101 if (CXXConstructorDecl *BaseCopyCtor = 3102 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3103 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3104 } 3105 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3106 FieldEnd = ClassDecl->field_end(); 3107 Field != FieldEnd; ++Field) { 3108 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3109 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3110 FieldType = Array->getElementType(); 3111 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3112 CXXRecordDecl *FieldClassDecl 3113 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3114 if (CXXConstructorDecl *FieldCopyCtor = 3115 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3116 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3117 } 3118 } 3119 CopyConstructor->setUsed(); 3120} 3121 3122Sema::OwningExprResult 3123Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3124 CXXConstructorDecl *Constructor, 3125 MultiExprArg ExprArgs) { 3126 bool Elidable = false; 3127 3128 // C++ [class.copy]p15: 3129 // Whenever a temporary class object is copied using a copy constructor, and 3130 // this object and the copy have the same cv-unqualified type, an 3131 // implementation is permitted to treat the original and the copy as two 3132 // different ways of referring to the same object and not perform a copy at 3133 // all, even if the class copy constructor or destructor have side effects. 3134 3135 // FIXME: Is this enough? 3136 if (Constructor->isCopyConstructor(Context)) { 3137 Expr *E = ((Expr **)ExprArgs.get())[0]; 3138 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3139 E = BE->getSubExpr(); 3140 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3141 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3142 E = ICE->getSubExpr(); 3143 3144 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3145 Elidable = true; 3146 } 3147 3148 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3149 Elidable, move(ExprArgs)); 3150} 3151 3152/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3153/// including handling of its default argument expressions. 3154Sema::OwningExprResult 3155Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3156 CXXConstructorDecl *Constructor, bool Elidable, 3157 MultiExprArg ExprArgs) { 3158 unsigned NumExprs = ExprArgs.size(); 3159 Expr **Exprs = (Expr **)ExprArgs.release(); 3160 3161 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3162 Elidable, Exprs, NumExprs)); 3163} 3164 3165Sema::OwningExprResult 3166Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3167 QualType Ty, 3168 SourceLocation TyBeginLoc, 3169 MultiExprArg Args, 3170 SourceLocation RParenLoc) { 3171 unsigned NumExprs = Args.size(); 3172 Expr **Exprs = (Expr **)Args.release(); 3173 3174 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3175 TyBeginLoc, Exprs, 3176 NumExprs, RParenLoc)); 3177} 3178 3179 3180bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3181 CXXConstructorDecl *Constructor, 3182 MultiExprArg Exprs) { 3183 OwningExprResult TempResult = 3184 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3185 move(Exprs)); 3186 if (TempResult.isInvalid()) 3187 return true; 3188 3189 Expr *Temp = TempResult.takeAs<Expr>(); 3190 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3191 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3192 VD->setInit(Context, Temp); 3193 3194 return false; 3195} 3196 3197void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3198 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3199 DeclInitType->getAs<RecordType>()->getDecl()); 3200 if (!ClassDecl->hasTrivialDestructor()) 3201 if (CXXDestructorDecl *Destructor = 3202 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3203 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3204} 3205 3206/// AddCXXDirectInitializerToDecl - This action is called immediately after 3207/// ActOnDeclarator, when a C++ direct initializer is present. 3208/// e.g: "int x(1);" 3209void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3210 SourceLocation LParenLoc, 3211 MultiExprArg Exprs, 3212 SourceLocation *CommaLocs, 3213 SourceLocation RParenLoc) { 3214 unsigned NumExprs = Exprs.size(); 3215 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3216 Decl *RealDecl = Dcl.getAs<Decl>(); 3217 3218 // If there is no declaration, there was an error parsing it. Just ignore 3219 // the initializer. 3220 if (RealDecl == 0) 3221 return; 3222 3223 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3224 if (!VDecl) { 3225 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3226 RealDecl->setInvalidDecl(); 3227 return; 3228 } 3229 3230 // We will represent direct-initialization similarly to copy-initialization: 3231 // int x(1); -as-> int x = 1; 3232 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3233 // 3234 // Clients that want to distinguish between the two forms, can check for 3235 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3236 // A major benefit is that clients that don't particularly care about which 3237 // exactly form was it (like the CodeGen) can handle both cases without 3238 // special case code. 3239 3240 // If either the declaration has a dependent type or if any of the expressions 3241 // is type-dependent, we represent the initialization via a ParenListExpr for 3242 // later use during template instantiation. 3243 if (VDecl->getType()->isDependentType() || 3244 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3245 // Let clients know that initialization was done with a direct initializer. 3246 VDecl->setCXXDirectInitializer(true); 3247 3248 // Store the initialization expressions as a ParenListExpr. 3249 unsigned NumExprs = Exprs.size(); 3250 VDecl->setInit(Context, 3251 new (Context) ParenListExpr(Context, LParenLoc, 3252 (Expr **)Exprs.release(), 3253 NumExprs, RParenLoc)); 3254 return; 3255 } 3256 3257 3258 // C++ 8.5p11: 3259 // The form of initialization (using parentheses or '=') is generally 3260 // insignificant, but does matter when the entity being initialized has a 3261 // class type. 3262 QualType DeclInitType = VDecl->getType(); 3263 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3264 DeclInitType = Context.getBaseElementType(Array); 3265 3266 // FIXME: This isn't the right place to complete the type. 3267 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3268 diag::err_typecheck_decl_incomplete_type)) { 3269 VDecl->setInvalidDecl(); 3270 return; 3271 } 3272 3273 if (VDecl->getType()->isRecordType()) { 3274 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3275 3276 CXXConstructorDecl *Constructor 3277 = PerformInitializationByConstructor(DeclInitType, 3278 move(Exprs), 3279 VDecl->getLocation(), 3280 SourceRange(VDecl->getLocation(), 3281 RParenLoc), 3282 VDecl->getDeclName(), 3283 IK_Direct, 3284 ConstructorArgs); 3285 if (!Constructor) 3286 RealDecl->setInvalidDecl(); 3287 else { 3288 VDecl->setCXXDirectInitializer(true); 3289 if (InitializeVarWithConstructor(VDecl, Constructor, 3290 move_arg(ConstructorArgs))) 3291 RealDecl->setInvalidDecl(); 3292 FinalizeVarWithDestructor(VDecl, DeclInitType); 3293 } 3294 return; 3295 } 3296 3297 if (NumExprs > 1) { 3298 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3299 << SourceRange(VDecl->getLocation(), RParenLoc); 3300 RealDecl->setInvalidDecl(); 3301 return; 3302 } 3303 3304 // Let clients know that initialization was done with a direct initializer. 3305 VDecl->setCXXDirectInitializer(true); 3306 3307 assert(NumExprs == 1 && "Expected 1 expression"); 3308 // Set the init expression, handles conversions. 3309 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3310 /*DirectInit=*/true); 3311} 3312 3313/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3314/// may occur as part of direct-initialization or copy-initialization. 3315/// 3316/// \param ClassType the type of the object being initialized, which must have 3317/// class type. 3318/// 3319/// \param ArgsPtr the arguments provided to initialize the object 3320/// 3321/// \param Loc the source location where the initialization occurs 3322/// 3323/// \param Range the source range that covers the entire initialization 3324/// 3325/// \param InitEntity the name of the entity being initialized, if known 3326/// 3327/// \param Kind the type of initialization being performed 3328/// 3329/// \param ConvertedArgs a vector that will be filled in with the 3330/// appropriately-converted arguments to the constructor (if initialization 3331/// succeeded). 3332/// 3333/// \returns the constructor used to initialize the object, if successful. 3334/// Otherwise, emits a diagnostic and returns NULL. 3335CXXConstructorDecl * 3336Sema::PerformInitializationByConstructor(QualType ClassType, 3337 MultiExprArg ArgsPtr, 3338 SourceLocation Loc, SourceRange Range, 3339 DeclarationName InitEntity, 3340 InitializationKind Kind, 3341 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3342 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3343 assert(ClassRec && "Can only initialize a class type here"); 3344 Expr **Args = (Expr **)ArgsPtr.get(); 3345 unsigned NumArgs = ArgsPtr.size(); 3346 3347 // C++ [dcl.init]p14: 3348 // If the initialization is direct-initialization, or if it is 3349 // copy-initialization where the cv-unqualified version of the 3350 // source type is the same class as, or a derived class of, the 3351 // class of the destination, constructors are considered. The 3352 // applicable constructors are enumerated (13.3.1.3), and the 3353 // best one is chosen through overload resolution (13.3). The 3354 // constructor so selected is called to initialize the object, 3355 // with the initializer expression(s) as its argument(s). If no 3356 // constructor applies, or the overload resolution is ambiguous, 3357 // the initialization is ill-formed. 3358 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3359 OverloadCandidateSet CandidateSet; 3360 3361 // Add constructors to the overload set. 3362 DeclarationName ConstructorName 3363 = Context.DeclarationNames.getCXXConstructorName( 3364 Context.getCanonicalType(ClassType.getUnqualifiedType())); 3365 DeclContext::lookup_const_iterator Con, ConEnd; 3366 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3367 Con != ConEnd; ++Con) { 3368 // Find the constructor (which may be a template). 3369 CXXConstructorDecl *Constructor = 0; 3370 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3371 if (ConstructorTmpl) 3372 Constructor 3373 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3374 else 3375 Constructor = cast<CXXConstructorDecl>(*Con); 3376 3377 if ((Kind == IK_Direct) || 3378 (Kind == IK_Copy && 3379 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3380 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 3381 if (ConstructorTmpl) 3382 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3383 Args, NumArgs, CandidateSet); 3384 else 3385 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3386 } 3387 } 3388 3389 // FIXME: When we decide not to synthesize the implicitly-declared 3390 // constructors, we'll need to make them appear here. 3391 3392 OverloadCandidateSet::iterator Best; 3393 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3394 case OR_Success: 3395 // We found a constructor. Break out so that we can convert the arguments 3396 // appropriately. 3397 break; 3398 3399 case OR_No_Viable_Function: 3400 if (InitEntity) 3401 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3402 << InitEntity << Range; 3403 else 3404 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3405 << ClassType << Range; 3406 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3407 return 0; 3408 3409 case OR_Ambiguous: 3410 if (InitEntity) 3411 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3412 else 3413 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3414 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3415 return 0; 3416 3417 case OR_Deleted: 3418 if (InitEntity) 3419 Diag(Loc, diag::err_ovl_deleted_init) 3420 << Best->Function->isDeleted() 3421 << InitEntity << Range; 3422 else 3423 Diag(Loc, diag::err_ovl_deleted_init) 3424 << Best->Function->isDeleted() 3425 << InitEntity << Range; 3426 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3427 return 0; 3428 } 3429 3430 // Convert the arguments, fill in default arguments, etc. 3431 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3432 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3433 return 0; 3434 3435 return Constructor; 3436} 3437 3438/// \brief Given a constructor and the set of arguments provided for the 3439/// constructor, convert the arguments and add any required default arguments 3440/// to form a proper call to this constructor. 3441/// 3442/// \returns true if an error occurred, false otherwise. 3443bool 3444Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3445 MultiExprArg ArgsPtr, 3446 SourceLocation Loc, 3447 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3448 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3449 unsigned NumArgs = ArgsPtr.size(); 3450 Expr **Args = (Expr **)ArgsPtr.get(); 3451 3452 const FunctionProtoType *Proto 3453 = Constructor->getType()->getAs<FunctionProtoType>(); 3454 assert(Proto && "Constructor without a prototype?"); 3455 unsigned NumArgsInProto = Proto->getNumArgs(); 3456 unsigned NumArgsToCheck = NumArgs; 3457 3458 // If too few arguments are available, we'll fill in the rest with defaults. 3459 if (NumArgs < NumArgsInProto) { 3460 NumArgsToCheck = NumArgsInProto; 3461 ConvertedArgs.reserve(NumArgsInProto); 3462 } else { 3463 ConvertedArgs.reserve(NumArgs); 3464 if (NumArgs > NumArgsInProto) 3465 NumArgsToCheck = NumArgsInProto; 3466 } 3467 3468 // Convert arguments 3469 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3470 QualType ProtoArgType = Proto->getArgType(i); 3471 3472 Expr *Arg; 3473 if (i < NumArgs) { 3474 Arg = Args[i]; 3475 3476 // Pass the argument. 3477 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3478 return true; 3479 3480 Args[i] = 0; 3481 } else { 3482 ParmVarDecl *Param = Constructor->getParamDecl(i); 3483 3484 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3485 if (DefArg.isInvalid()) 3486 return true; 3487 3488 Arg = DefArg.takeAs<Expr>(); 3489 } 3490 3491 ConvertedArgs.push_back(Arg); 3492 } 3493 3494 // If this is a variadic call, handle args passed through "...". 3495 if (Proto->isVariadic()) { 3496 // Promote the arguments (C99 6.5.2.2p7). 3497 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3498 Expr *Arg = Args[i]; 3499 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3500 return true; 3501 3502 ConvertedArgs.push_back(Arg); 3503 Args[i] = 0; 3504 } 3505 } 3506 3507 return false; 3508} 3509 3510/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3511/// determine whether they are reference-related, 3512/// reference-compatible, reference-compatible with added 3513/// qualification, or incompatible, for use in C++ initialization by 3514/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3515/// type, and the first type (T1) is the pointee type of the reference 3516/// type being initialized. 3517Sema::ReferenceCompareResult 3518Sema::CompareReferenceRelationship(QualType T1, QualType T2, 3519 bool& DerivedToBase) { 3520 assert(!T1->isReferenceType() && 3521 "T1 must be the pointee type of the reference type"); 3522 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 3523 3524 T1 = Context.getCanonicalType(T1); 3525 T2 = Context.getCanonicalType(T2); 3526 QualType UnqualT1 = T1.getUnqualifiedType(); 3527 QualType UnqualT2 = T2.getUnqualifiedType(); 3528 3529 // C++ [dcl.init.ref]p4: 3530 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3531 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3532 // T1 is a base class of T2. 3533 if (UnqualT1 == UnqualT2) 3534 DerivedToBase = false; 3535 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 3536 DerivedToBase = true; 3537 else 3538 return Ref_Incompatible; 3539 3540 // At this point, we know that T1 and T2 are reference-related (at 3541 // least). 3542 3543 // C++ [dcl.init.ref]p4: 3544 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3545 // reference-related to T2 and cv1 is the same cv-qualification 3546 // as, or greater cv-qualification than, cv2. For purposes of 3547 // overload resolution, cases for which cv1 is greater 3548 // cv-qualification than cv2 are identified as 3549 // reference-compatible with added qualification (see 13.3.3.2). 3550 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3551 return Ref_Compatible; 3552 else if (T1.isMoreQualifiedThan(T2)) 3553 return Ref_Compatible_With_Added_Qualification; 3554 else 3555 return Ref_Related; 3556} 3557 3558/// CheckReferenceInit - Check the initialization of a reference 3559/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3560/// the initializer (either a simple initializer or an initializer 3561/// list), and DeclType is the type of the declaration. When ICS is 3562/// non-null, this routine will compute the implicit conversion 3563/// sequence according to C++ [over.ics.ref] and will not produce any 3564/// diagnostics; when ICS is null, it will emit diagnostics when any 3565/// errors are found. Either way, a return value of true indicates 3566/// that there was a failure, a return value of false indicates that 3567/// the reference initialization succeeded. 3568/// 3569/// When @p SuppressUserConversions, user-defined conversions are 3570/// suppressed. 3571/// When @p AllowExplicit, we also permit explicit user-defined 3572/// conversion functions. 3573/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3574bool 3575Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3576 SourceLocation DeclLoc, 3577 bool SuppressUserConversions, 3578 bool AllowExplicit, bool ForceRValue, 3579 ImplicitConversionSequence *ICS) { 3580 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3581 3582 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3583 QualType T2 = Init->getType(); 3584 3585 // If the initializer is the address of an overloaded function, try 3586 // to resolve the overloaded function. If all goes well, T2 is the 3587 // type of the resulting function. 3588 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3589 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3590 ICS != 0); 3591 if (Fn) { 3592 // Since we're performing this reference-initialization for 3593 // real, update the initializer with the resulting function. 3594 if (!ICS) { 3595 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3596 return true; 3597 3598 Init = FixOverloadedFunctionReference(Init, Fn); 3599 } 3600 3601 T2 = Fn->getType(); 3602 } 3603 } 3604 3605 // Compute some basic properties of the types and the initializer. 3606 bool isRValRef = DeclType->isRValueReferenceType(); 3607 bool DerivedToBase = false; 3608 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3609 Init->isLvalue(Context); 3610 ReferenceCompareResult RefRelationship 3611 = CompareReferenceRelationship(T1, T2, DerivedToBase); 3612 3613 // Most paths end in a failed conversion. 3614 if (ICS) 3615 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3616 3617 // C++ [dcl.init.ref]p5: 3618 // A reference to type "cv1 T1" is initialized by an expression 3619 // of type "cv2 T2" as follows: 3620 3621 // -- If the initializer expression 3622 3623 // Rvalue references cannot bind to lvalues (N2812). 3624 // There is absolutely no situation where they can. In particular, note that 3625 // this is ill-formed, even if B has a user-defined conversion to A&&: 3626 // B b; 3627 // A&& r = b; 3628 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3629 if (!ICS) 3630 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3631 << Init->getSourceRange(); 3632 return true; 3633 } 3634 3635 bool BindsDirectly = false; 3636 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3637 // reference-compatible with "cv2 T2," or 3638 // 3639 // Note that the bit-field check is skipped if we are just computing 3640 // the implicit conversion sequence (C++ [over.best.ics]p2). 3641 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3642 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3643 BindsDirectly = true; 3644 3645 if (ICS) { 3646 // C++ [over.ics.ref]p1: 3647 // When a parameter of reference type binds directly (8.5.3) 3648 // to an argument expression, the implicit conversion sequence 3649 // is the identity conversion, unless the argument expression 3650 // has a type that is a derived class of the parameter type, 3651 // in which case the implicit conversion sequence is a 3652 // derived-to-base Conversion (13.3.3.1). 3653 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3654 ICS->Standard.First = ICK_Identity; 3655 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3656 ICS->Standard.Third = ICK_Identity; 3657 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3658 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3659 ICS->Standard.ReferenceBinding = true; 3660 ICS->Standard.DirectBinding = true; 3661 ICS->Standard.RRefBinding = false; 3662 ICS->Standard.CopyConstructor = 0; 3663 3664 // Nothing more to do: the inaccessibility/ambiguity check for 3665 // derived-to-base conversions is suppressed when we're 3666 // computing the implicit conversion sequence (C++ 3667 // [over.best.ics]p2). 3668 return false; 3669 } else { 3670 // Perform the conversion. 3671 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3672 if (DerivedToBase) 3673 CK = CastExpr::CK_DerivedToBase; 3674 else if(CheckExceptionSpecCompatibility(Init, T1)) 3675 return true; 3676 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3677 } 3678 } 3679 3680 // -- has a class type (i.e., T2 is a class type) and can be 3681 // implicitly converted to an lvalue of type "cv3 T3," 3682 // where "cv1 T1" is reference-compatible with "cv3 T3" 3683 // 92) (this conversion is selected by enumerating the 3684 // applicable conversion functions (13.3.1.6) and choosing 3685 // the best one through overload resolution (13.3)), 3686 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3687 !RequireCompleteType(DeclLoc, T2, 0)) { 3688 CXXRecordDecl *T2RecordDecl 3689 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3690 3691 OverloadCandidateSet CandidateSet; 3692 OverloadedFunctionDecl *Conversions 3693 = T2RecordDecl->getVisibleConversionFunctions(); 3694 for (OverloadedFunctionDecl::function_iterator Func 3695 = Conversions->function_begin(); 3696 Func != Conversions->function_end(); ++Func) { 3697 FunctionTemplateDecl *ConvTemplate 3698 = dyn_cast<FunctionTemplateDecl>(*Func); 3699 CXXConversionDecl *Conv; 3700 if (ConvTemplate) 3701 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3702 else 3703 Conv = cast<CXXConversionDecl>(*Func); 3704 3705 // If the conversion function doesn't return a reference type, 3706 // it can't be considered for this conversion. 3707 if (Conv->getConversionType()->isLValueReferenceType() && 3708 (AllowExplicit || !Conv->isExplicit())) { 3709 if (ConvTemplate) 3710 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3711 CandidateSet); 3712 else 3713 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3714 } 3715 } 3716 3717 OverloadCandidateSet::iterator Best; 3718 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3719 case OR_Success: 3720 // This is a direct binding. 3721 BindsDirectly = true; 3722 3723 if (ICS) { 3724 // C++ [over.ics.ref]p1: 3725 // 3726 // [...] If the parameter binds directly to the result of 3727 // applying a conversion function to the argument 3728 // expression, the implicit conversion sequence is a 3729 // user-defined conversion sequence (13.3.3.1.2), with the 3730 // second standard conversion sequence either an identity 3731 // conversion or, if the conversion function returns an 3732 // entity of a type that is a derived class of the parameter 3733 // type, a derived-to-base Conversion. 3734 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3735 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3736 ICS->UserDefined.After = Best->FinalConversion; 3737 ICS->UserDefined.ConversionFunction = Best->Function; 3738 assert(ICS->UserDefined.After.ReferenceBinding && 3739 ICS->UserDefined.After.DirectBinding && 3740 "Expected a direct reference binding!"); 3741 return false; 3742 } else { 3743 OwningExprResult InitConversion = 3744 BuildCXXCastArgument(DeclLoc, QualType(), 3745 CastExpr::CK_UserDefinedConversion, 3746 cast<CXXMethodDecl>(Best->Function), 3747 Owned(Init)); 3748 Init = InitConversion.takeAs<Expr>(); 3749 3750 if (CheckExceptionSpecCompatibility(Init, T1)) 3751 return true; 3752 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3753 /*isLvalue=*/true); 3754 } 3755 break; 3756 3757 case OR_Ambiguous: 3758 if (ICS) { 3759 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3760 Cand != CandidateSet.end(); ++Cand) 3761 if (Cand->Viable) 3762 ICS->ConversionFunctionSet.push_back(Cand->Function); 3763 break; 3764 } 3765 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3766 << Init->getSourceRange(); 3767 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3768 return true; 3769 3770 case OR_No_Viable_Function: 3771 case OR_Deleted: 3772 // There was no suitable conversion, or we found a deleted 3773 // conversion; continue with other checks. 3774 break; 3775 } 3776 } 3777 3778 if (BindsDirectly) { 3779 // C++ [dcl.init.ref]p4: 3780 // [...] In all cases where the reference-related or 3781 // reference-compatible relationship of two types is used to 3782 // establish the validity of a reference binding, and T1 is a 3783 // base class of T2, a program that necessitates such a binding 3784 // is ill-formed if T1 is an inaccessible (clause 11) or 3785 // ambiguous (10.2) base class of T2. 3786 // 3787 // Note that we only check this condition when we're allowed to 3788 // complain about errors, because we should not be checking for 3789 // ambiguity (or inaccessibility) unless the reference binding 3790 // actually happens. 3791 if (DerivedToBase) 3792 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3793 Init->getSourceRange()); 3794 else 3795 return false; 3796 } 3797 3798 // -- Otherwise, the reference shall be to a non-volatile const 3799 // type (i.e., cv1 shall be const), or the reference shall be an 3800 // rvalue reference and the initializer expression shall be an rvalue. 3801 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3802 if (!ICS) 3803 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3804 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3805 << T2 << Init->getSourceRange(); 3806 return true; 3807 } 3808 3809 // -- If the initializer expression is an rvalue, with T2 a 3810 // class type, and "cv1 T1" is reference-compatible with 3811 // "cv2 T2," the reference is bound in one of the 3812 // following ways (the choice is implementation-defined): 3813 // 3814 // -- The reference is bound to the object represented by 3815 // the rvalue (see 3.10) or to a sub-object within that 3816 // object. 3817 // 3818 // -- A temporary of type "cv1 T2" [sic] is created, and 3819 // a constructor is called to copy the entire rvalue 3820 // object into the temporary. The reference is bound to 3821 // the temporary or to a sub-object within the 3822 // temporary. 3823 // 3824 // The constructor that would be used to make the copy 3825 // shall be callable whether or not the copy is actually 3826 // done. 3827 // 3828 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3829 // freedom, so we will always take the first option and never build 3830 // a temporary in this case. FIXME: We will, however, have to check 3831 // for the presence of a copy constructor in C++98/03 mode. 3832 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3833 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3834 if (ICS) { 3835 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3836 ICS->Standard.First = ICK_Identity; 3837 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3838 ICS->Standard.Third = ICK_Identity; 3839 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3840 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3841 ICS->Standard.ReferenceBinding = true; 3842 ICS->Standard.DirectBinding = false; 3843 ICS->Standard.RRefBinding = isRValRef; 3844 ICS->Standard.CopyConstructor = 0; 3845 } else { 3846 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3847 if (DerivedToBase) 3848 CK = CastExpr::CK_DerivedToBase; 3849 else if(CheckExceptionSpecCompatibility(Init, T1)) 3850 return true; 3851 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 3852 } 3853 return false; 3854 } 3855 3856 // -- Otherwise, a temporary of type "cv1 T1" is created and 3857 // initialized from the initializer expression using the 3858 // rules for a non-reference copy initialization (8.5). The 3859 // reference is then bound to the temporary. If T1 is 3860 // reference-related to T2, cv1 must be the same 3861 // cv-qualification as, or greater cv-qualification than, 3862 // cv2; otherwise, the program is ill-formed. 3863 if (RefRelationship == Ref_Related) { 3864 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3865 // we would be reference-compatible or reference-compatible with 3866 // added qualification. But that wasn't the case, so the reference 3867 // initialization fails. 3868 if (!ICS) 3869 Diag(DeclLoc, diag::err_reference_init_drops_quals) 3870 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3871 << T2 << Init->getSourceRange(); 3872 return true; 3873 } 3874 3875 // If at least one of the types is a class type, the types are not 3876 // related, and we aren't allowed any user conversions, the 3877 // reference binding fails. This case is important for breaking 3878 // recursion, since TryImplicitConversion below will attempt to 3879 // create a temporary through the use of a copy constructor. 3880 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3881 (T1->isRecordType() || T2->isRecordType())) { 3882 if (!ICS) 3883 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 3884 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3885 return true; 3886 } 3887 3888 // Actually try to convert the initializer to T1. 3889 if (ICS) { 3890 // C++ [over.ics.ref]p2: 3891 // 3892 // When a parameter of reference type is not bound directly to 3893 // an argument expression, the conversion sequence is the one 3894 // required to convert the argument expression to the 3895 // underlying type of the reference according to 3896 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3897 // to copy-initializing a temporary of the underlying type with 3898 // the argument expression. Any difference in top-level 3899 // cv-qualification is subsumed by the initialization itself 3900 // and does not constitute a conversion. 3901 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 3902 /*AllowExplicit=*/false, 3903 /*ForceRValue=*/false, 3904 /*InOverloadResolution=*/false); 3905 3906 // Of course, that's still a reference binding. 3907 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3908 ICS->Standard.ReferenceBinding = true; 3909 ICS->Standard.RRefBinding = isRValRef; 3910 } else if (ICS->ConversionKind == 3911 ImplicitConversionSequence::UserDefinedConversion) { 3912 ICS->UserDefined.After.ReferenceBinding = true; 3913 ICS->UserDefined.After.RRefBinding = isRValRef; 3914 } 3915 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3916 } else { 3917 ImplicitConversionSequence Conversions; 3918 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 3919 false, false, 3920 Conversions); 3921 if (badConversion) { 3922 if ((Conversions.ConversionKind == 3923 ImplicitConversionSequence::BadConversion) 3924 && !Conversions.ConversionFunctionSet.empty()) { 3925 Diag(DeclLoc, 3926 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 3927 for (int j = Conversions.ConversionFunctionSet.size()-1; 3928 j >= 0; j--) { 3929 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 3930 Diag(Func->getLocation(), diag::err_ovl_candidate); 3931 } 3932 } 3933 else { 3934 if (isRValRef) 3935 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3936 << Init->getSourceRange(); 3937 else 3938 Diag(DeclLoc, diag::err_invalid_initialization) 3939 << DeclType << Init->getType() << Init->getSourceRange(); 3940 } 3941 } 3942 return badConversion; 3943 } 3944} 3945 3946/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3947/// of this overloaded operator is well-formed. If so, returns false; 3948/// otherwise, emits appropriate diagnostics and returns true. 3949bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3950 assert(FnDecl && FnDecl->isOverloadedOperator() && 3951 "Expected an overloaded operator declaration"); 3952 3953 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3954 3955 // C++ [over.oper]p5: 3956 // The allocation and deallocation functions, operator new, 3957 // operator new[], operator delete and operator delete[], are 3958 // described completely in 3.7.3. The attributes and restrictions 3959 // found in the rest of this subclause do not apply to them unless 3960 // explicitly stated in 3.7.3. 3961 // FIXME: Write a separate routine for checking this. For now, just allow it. 3962 if (Op == OO_New || Op == OO_Array_New || 3963 Op == OO_Delete || Op == OO_Array_Delete) 3964 return false; 3965 3966 // C++ [over.oper]p6: 3967 // An operator function shall either be a non-static member 3968 // function or be a non-member function and have at least one 3969 // parameter whose type is a class, a reference to a class, an 3970 // enumeration, or a reference to an enumeration. 3971 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3972 if (MethodDecl->isStatic()) 3973 return Diag(FnDecl->getLocation(), 3974 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3975 } else { 3976 bool ClassOrEnumParam = false; 3977 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3978 ParamEnd = FnDecl->param_end(); 3979 Param != ParamEnd; ++Param) { 3980 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3981 if (ParamType->isDependentType() || ParamType->isRecordType() || 3982 ParamType->isEnumeralType()) { 3983 ClassOrEnumParam = true; 3984 break; 3985 } 3986 } 3987 3988 if (!ClassOrEnumParam) 3989 return Diag(FnDecl->getLocation(), 3990 diag::err_operator_overload_needs_class_or_enum) 3991 << FnDecl->getDeclName(); 3992 } 3993 3994 // C++ [over.oper]p8: 3995 // An operator function cannot have default arguments (8.3.6), 3996 // except where explicitly stated below. 3997 // 3998 // Only the function-call operator allows default arguments 3999 // (C++ [over.call]p1). 4000 if (Op != OO_Call) { 4001 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4002 Param != FnDecl->param_end(); ++Param) { 4003 if ((*Param)->hasUnparsedDefaultArg()) 4004 return Diag((*Param)->getLocation(), 4005 diag::err_operator_overload_default_arg) 4006 << FnDecl->getDeclName(); 4007 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4008 return Diag((*Param)->getLocation(), 4009 diag::err_operator_overload_default_arg) 4010 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4011 } 4012 } 4013 4014 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4015 { false, false, false } 4016#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4017 , { Unary, Binary, MemberOnly } 4018#include "clang/Basic/OperatorKinds.def" 4019 }; 4020 4021 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4022 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4023 bool MustBeMemberOperator = OperatorUses[Op][2]; 4024 4025 // C++ [over.oper]p8: 4026 // [...] Operator functions cannot have more or fewer parameters 4027 // than the number required for the corresponding operator, as 4028 // described in the rest of this subclause. 4029 unsigned NumParams = FnDecl->getNumParams() 4030 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4031 if (Op != OO_Call && 4032 ((NumParams == 1 && !CanBeUnaryOperator) || 4033 (NumParams == 2 && !CanBeBinaryOperator) || 4034 (NumParams < 1) || (NumParams > 2))) { 4035 // We have the wrong number of parameters. 4036 unsigned ErrorKind; 4037 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4038 ErrorKind = 2; // 2 -> unary or binary. 4039 } else if (CanBeUnaryOperator) { 4040 ErrorKind = 0; // 0 -> unary 4041 } else { 4042 assert(CanBeBinaryOperator && 4043 "All non-call overloaded operators are unary or binary!"); 4044 ErrorKind = 1; // 1 -> binary 4045 } 4046 4047 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4048 << FnDecl->getDeclName() << NumParams << ErrorKind; 4049 } 4050 4051 // Overloaded operators other than operator() cannot be variadic. 4052 if (Op != OO_Call && 4053 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4054 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4055 << FnDecl->getDeclName(); 4056 } 4057 4058 // Some operators must be non-static member functions. 4059 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4060 return Diag(FnDecl->getLocation(), 4061 diag::err_operator_overload_must_be_member) 4062 << FnDecl->getDeclName(); 4063 } 4064 4065 // C++ [over.inc]p1: 4066 // The user-defined function called operator++ implements the 4067 // prefix and postfix ++ operator. If this function is a member 4068 // function with no parameters, or a non-member function with one 4069 // parameter of class or enumeration type, it defines the prefix 4070 // increment operator ++ for objects of that type. If the function 4071 // is a member function with one parameter (which shall be of type 4072 // int) or a non-member function with two parameters (the second 4073 // of which shall be of type int), it defines the postfix 4074 // increment operator ++ for objects of that type. 4075 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4076 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4077 bool ParamIsInt = false; 4078 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4079 ParamIsInt = BT->getKind() == BuiltinType::Int; 4080 4081 if (!ParamIsInt) 4082 return Diag(LastParam->getLocation(), 4083 diag::err_operator_overload_post_incdec_must_be_int) 4084 << LastParam->getType() << (Op == OO_MinusMinus); 4085 } 4086 4087 // Notify the class if it got an assignment operator. 4088 if (Op == OO_Equal) { 4089 // Would have returned earlier otherwise. 4090 assert(isa<CXXMethodDecl>(FnDecl) && 4091 "Overloaded = not member, but not filtered."); 4092 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4093 Method->setCopyAssignment(true); 4094 Method->getParent()->addedAssignmentOperator(Context, Method); 4095 } 4096 4097 return false; 4098} 4099 4100/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4101/// linkage specification, including the language and (if present) 4102/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4103/// the location of the language string literal, which is provided 4104/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4105/// the '{' brace. Otherwise, this linkage specification does not 4106/// have any braces. 4107Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4108 SourceLocation ExternLoc, 4109 SourceLocation LangLoc, 4110 const char *Lang, 4111 unsigned StrSize, 4112 SourceLocation LBraceLoc) { 4113 LinkageSpecDecl::LanguageIDs Language; 4114 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4115 Language = LinkageSpecDecl::lang_c; 4116 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4117 Language = LinkageSpecDecl::lang_cxx; 4118 else { 4119 Diag(LangLoc, diag::err_bad_language); 4120 return DeclPtrTy(); 4121 } 4122 4123 // FIXME: Add all the various semantics of linkage specifications 4124 4125 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4126 LangLoc, Language, 4127 LBraceLoc.isValid()); 4128 CurContext->addDecl(D); 4129 PushDeclContext(S, D); 4130 return DeclPtrTy::make(D); 4131} 4132 4133/// ActOnFinishLinkageSpecification - Completely the definition of 4134/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4135/// valid, it's the position of the closing '}' brace in a linkage 4136/// specification that uses braces. 4137Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4138 DeclPtrTy LinkageSpec, 4139 SourceLocation RBraceLoc) { 4140 if (LinkageSpec) 4141 PopDeclContext(); 4142 return LinkageSpec; 4143} 4144 4145/// \brief Perform semantic analysis for the variable declaration that 4146/// occurs within a C++ catch clause, returning the newly-created 4147/// variable. 4148VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4149 DeclaratorInfo *DInfo, 4150 IdentifierInfo *Name, 4151 SourceLocation Loc, 4152 SourceRange Range) { 4153 bool Invalid = false; 4154 4155 // Arrays and functions decay. 4156 if (ExDeclType->isArrayType()) 4157 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4158 else if (ExDeclType->isFunctionType()) 4159 ExDeclType = Context.getPointerType(ExDeclType); 4160 4161 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4162 // The exception-declaration shall not denote a pointer or reference to an 4163 // incomplete type, other than [cv] void*. 4164 // N2844 forbids rvalue references. 4165 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4166 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4167 Invalid = true; 4168 } 4169 4170 QualType BaseType = ExDeclType; 4171 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4172 unsigned DK = diag::err_catch_incomplete; 4173 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4174 BaseType = Ptr->getPointeeType(); 4175 Mode = 1; 4176 DK = diag::err_catch_incomplete_ptr; 4177 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4178 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4179 BaseType = Ref->getPointeeType(); 4180 Mode = 2; 4181 DK = diag::err_catch_incomplete_ref; 4182 } 4183 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4184 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4185 Invalid = true; 4186 4187 if (!Invalid && !ExDeclType->isDependentType() && 4188 RequireNonAbstractType(Loc, ExDeclType, 4189 diag::err_abstract_type_in_decl, 4190 AbstractVariableType)) 4191 Invalid = true; 4192 4193 // FIXME: Need to test for ability to copy-construct and destroy the 4194 // exception variable. 4195 4196 // FIXME: Need to check for abstract classes. 4197 4198 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4199 Name, ExDeclType, DInfo, VarDecl::None); 4200 4201 if (Invalid) 4202 ExDecl->setInvalidDecl(); 4203 4204 return ExDecl; 4205} 4206 4207/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4208/// handler. 4209Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4210 DeclaratorInfo *DInfo = 0; 4211 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4212 4213 bool Invalid = D.isInvalidType(); 4214 IdentifierInfo *II = D.getIdentifier(); 4215 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4216 // The scope should be freshly made just for us. There is just no way 4217 // it contains any previous declaration. 4218 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4219 if (PrevDecl->isTemplateParameter()) { 4220 // Maybe we will complain about the shadowed template parameter. 4221 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4222 } 4223 } 4224 4225 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4226 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4227 << D.getCXXScopeSpec().getRange(); 4228 Invalid = true; 4229 } 4230 4231 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4232 D.getIdentifier(), 4233 D.getIdentifierLoc(), 4234 D.getDeclSpec().getSourceRange()); 4235 4236 if (Invalid) 4237 ExDecl->setInvalidDecl(); 4238 4239 // Add the exception declaration into this scope. 4240 if (II) 4241 PushOnScopeChains(ExDecl, S); 4242 else 4243 CurContext->addDecl(ExDecl); 4244 4245 ProcessDeclAttributes(S, ExDecl, D); 4246 return DeclPtrTy::make(ExDecl); 4247} 4248 4249Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4250 ExprArg assertexpr, 4251 ExprArg assertmessageexpr) { 4252 Expr *AssertExpr = (Expr *)assertexpr.get(); 4253 StringLiteral *AssertMessage = 4254 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4255 4256 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4257 llvm::APSInt Value(32); 4258 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4259 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4260 AssertExpr->getSourceRange(); 4261 return DeclPtrTy(); 4262 } 4263 4264 if (Value == 0) { 4265 std::string str(AssertMessage->getStrData(), 4266 AssertMessage->getByteLength()); 4267 Diag(AssertLoc, diag::err_static_assert_failed) 4268 << str << AssertExpr->getSourceRange(); 4269 } 4270 } 4271 4272 assertexpr.release(); 4273 assertmessageexpr.release(); 4274 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4275 AssertExpr, AssertMessage); 4276 4277 CurContext->addDecl(Decl); 4278 return DeclPtrTy::make(Decl); 4279} 4280 4281/// Handle a friend type declaration. This works in tandem with 4282/// ActOnTag. 4283/// 4284/// Notes on friend class templates: 4285/// 4286/// We generally treat friend class declarations as if they were 4287/// declaring a class. So, for example, the elaborated type specifier 4288/// in a friend declaration is required to obey the restrictions of a 4289/// class-head (i.e. no typedefs in the scope chain), template 4290/// parameters are required to match up with simple template-ids, &c. 4291/// However, unlike when declaring a template specialization, it's 4292/// okay to refer to a template specialization without an empty 4293/// template parameter declaration, e.g. 4294/// friend class A<T>::B<unsigned>; 4295/// We permit this as a special case; if there are any template 4296/// parameters present at all, require proper matching, i.e. 4297/// template <> template <class T> friend class A<int>::B; 4298Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4299 MultiTemplateParamsArg TempParams) { 4300 SourceLocation Loc = DS.getSourceRange().getBegin(); 4301 4302 assert(DS.isFriendSpecified()); 4303 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4304 4305 // Try to convert the decl specifier to a type. This works for 4306 // friend templates because ActOnTag never produces a ClassTemplateDecl 4307 // for a TUK_Friend. 4308 Declarator TheDeclarator(DS, Declarator::MemberContext); 4309 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4310 if (TheDeclarator.isInvalidType()) 4311 return DeclPtrTy(); 4312 4313 // This is definitely an error in C++98. It's probably meant to 4314 // be forbidden in C++0x, too, but the specification is just 4315 // poorly written. 4316 // 4317 // The problem is with declarations like the following: 4318 // template <T> friend A<T>::foo; 4319 // where deciding whether a class C is a friend or not now hinges 4320 // on whether there exists an instantiation of A that causes 4321 // 'foo' to equal C. There are restrictions on class-heads 4322 // (which we declare (by fiat) elaborated friend declarations to 4323 // be) that makes this tractable. 4324 // 4325 // FIXME: handle "template <> friend class A<T>;", which 4326 // is possibly well-formed? Who even knows? 4327 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4328 Diag(Loc, diag::err_tagless_friend_type_template) 4329 << DS.getSourceRange(); 4330 return DeclPtrTy(); 4331 } 4332 4333 // C++ [class.friend]p2: 4334 // An elaborated-type-specifier shall be used in a friend declaration 4335 // for a class.* 4336 // * The class-key of the elaborated-type-specifier is required. 4337 // This is one of the rare places in Clang where it's legitimate to 4338 // ask about the "spelling" of the type. 4339 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4340 // If we evaluated the type to a record type, suggest putting 4341 // a tag in front. 4342 if (const RecordType *RT = T->getAs<RecordType>()) { 4343 RecordDecl *RD = RT->getDecl(); 4344 4345 std::string InsertionText = std::string(" ") + RD->getKindName(); 4346 4347 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4348 << (unsigned) RD->getTagKind() 4349 << T 4350 << SourceRange(DS.getFriendSpecLoc()) 4351 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4352 InsertionText); 4353 return DeclPtrTy(); 4354 }else { 4355 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4356 << DS.getSourceRange(); 4357 return DeclPtrTy(); 4358 } 4359 } 4360 4361 // Enum types cannot be friends. 4362 if (T->getAs<EnumType>()) { 4363 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4364 << SourceRange(DS.getFriendSpecLoc()); 4365 return DeclPtrTy(); 4366 } 4367 4368 // C++98 [class.friend]p1: A friend of a class is a function 4369 // or class that is not a member of the class . . . 4370 // But that's a silly restriction which nobody implements for 4371 // inner classes, and C++0x removes it anyway, so we only report 4372 // this (as a warning) if we're being pedantic. 4373 if (!getLangOptions().CPlusPlus0x) 4374 if (const RecordType *RT = T->getAs<RecordType>()) 4375 if (RT->getDecl()->getDeclContext() == CurContext) 4376 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4377 4378 Decl *D; 4379 if (TempParams.size()) 4380 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4381 TempParams.size(), 4382 (TemplateParameterList**) TempParams.release(), 4383 T.getTypePtr(), 4384 DS.getFriendSpecLoc()); 4385 else 4386 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4387 DS.getFriendSpecLoc()); 4388 D->setAccess(AS_public); 4389 CurContext->addDecl(D); 4390 4391 return DeclPtrTy::make(D); 4392} 4393 4394Sema::DeclPtrTy 4395Sema::ActOnFriendFunctionDecl(Scope *S, 4396 Declarator &D, 4397 bool IsDefinition, 4398 MultiTemplateParamsArg TemplateParams) { 4399 const DeclSpec &DS = D.getDeclSpec(); 4400 4401 assert(DS.isFriendSpecified()); 4402 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4403 4404 SourceLocation Loc = D.getIdentifierLoc(); 4405 DeclaratorInfo *DInfo = 0; 4406 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4407 4408 // C++ [class.friend]p1 4409 // A friend of a class is a function or class.... 4410 // Note that this sees through typedefs, which is intended. 4411 // It *doesn't* see through dependent types, which is correct 4412 // according to [temp.arg.type]p3: 4413 // If a declaration acquires a function type through a 4414 // type dependent on a template-parameter and this causes 4415 // a declaration that does not use the syntactic form of a 4416 // function declarator to have a function type, the program 4417 // is ill-formed. 4418 if (!T->isFunctionType()) { 4419 Diag(Loc, diag::err_unexpected_friend); 4420 4421 // It might be worthwhile to try to recover by creating an 4422 // appropriate declaration. 4423 return DeclPtrTy(); 4424 } 4425 4426 // C++ [namespace.memdef]p3 4427 // - If a friend declaration in a non-local class first declares a 4428 // class or function, the friend class or function is a member 4429 // of the innermost enclosing namespace. 4430 // - The name of the friend is not found by simple name lookup 4431 // until a matching declaration is provided in that namespace 4432 // scope (either before or after the class declaration granting 4433 // friendship). 4434 // - If a friend function is called, its name may be found by the 4435 // name lookup that considers functions from namespaces and 4436 // classes associated with the types of the function arguments. 4437 // - When looking for a prior declaration of a class or a function 4438 // declared as a friend, scopes outside the innermost enclosing 4439 // namespace scope are not considered. 4440 4441 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4442 DeclarationName Name = GetNameForDeclarator(D); 4443 assert(Name); 4444 4445 // The context we found the declaration in, or in which we should 4446 // create the declaration. 4447 DeclContext *DC; 4448 4449 // FIXME: handle local classes 4450 4451 // Recover from invalid scope qualifiers as if they just weren't there. 4452 NamedDecl *PrevDecl = 0; 4453 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4454 // FIXME: RequireCompleteDeclContext 4455 DC = computeDeclContext(ScopeQual); 4456 4457 // FIXME: handle dependent contexts 4458 if (!DC) return DeclPtrTy(); 4459 4460 LookupResult R; 4461 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4462 PrevDecl = R.getAsSingleDecl(Context); 4463 4464 // If searching in that context implicitly found a declaration in 4465 // a different context, treat it like it wasn't found at all. 4466 // TODO: better diagnostics for this case. Suggesting the right 4467 // qualified scope would be nice... 4468 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4469 D.setInvalidType(); 4470 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4471 return DeclPtrTy(); 4472 } 4473 4474 // C++ [class.friend]p1: A friend of a class is a function or 4475 // class that is not a member of the class . . . 4476 if (DC->Equals(CurContext)) 4477 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4478 4479 // Otherwise walk out to the nearest namespace scope looking for matches. 4480 } else { 4481 // TODO: handle local class contexts. 4482 4483 DC = CurContext; 4484 while (true) { 4485 // Skip class contexts. If someone can cite chapter and verse 4486 // for this behavior, that would be nice --- it's what GCC and 4487 // EDG do, and it seems like a reasonable intent, but the spec 4488 // really only says that checks for unqualified existing 4489 // declarations should stop at the nearest enclosing namespace, 4490 // not that they should only consider the nearest enclosing 4491 // namespace. 4492 while (DC->isRecord()) 4493 DC = DC->getParent(); 4494 4495 LookupResult R; 4496 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4497 PrevDecl = R.getAsSingleDecl(Context); 4498 4499 // TODO: decide what we think about using declarations. 4500 if (PrevDecl) 4501 break; 4502 4503 if (DC->isFileContext()) break; 4504 DC = DC->getParent(); 4505 } 4506 4507 // C++ [class.friend]p1: A friend of a class is a function or 4508 // class that is not a member of the class . . . 4509 // C++0x changes this for both friend types and functions. 4510 // Most C++ 98 compilers do seem to give an error here, so 4511 // we do, too. 4512 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4513 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4514 } 4515 4516 if (DC->isFileContext()) { 4517 // This implies that it has to be an operator or function. 4518 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4519 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4520 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4521 Diag(Loc, diag::err_introducing_special_friend) << 4522 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4523 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4524 return DeclPtrTy(); 4525 } 4526 } 4527 4528 bool Redeclaration = false; 4529 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4530 move(TemplateParams), 4531 IsDefinition, 4532 Redeclaration); 4533 if (!ND) return DeclPtrTy(); 4534 4535 assert(ND->getDeclContext() == DC); 4536 assert(ND->getLexicalDeclContext() == CurContext); 4537 4538 // Add the function declaration to the appropriate lookup tables, 4539 // adjusting the redeclarations list as necessary. We don't 4540 // want to do this yet if the friending class is dependent. 4541 // 4542 // Also update the scope-based lookup if the target context's 4543 // lookup context is in lexical scope. 4544 if (!CurContext->isDependentContext()) { 4545 DC = DC->getLookupContext(); 4546 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4547 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4548 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4549 } 4550 4551 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4552 D.getIdentifierLoc(), ND, 4553 DS.getFriendSpecLoc()); 4554 FrD->setAccess(AS_public); 4555 CurContext->addDecl(FrD); 4556 4557 return DeclPtrTy::make(ND); 4558} 4559 4560void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4561 AdjustDeclIfTemplate(dcl); 4562 4563 Decl *Dcl = dcl.getAs<Decl>(); 4564 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4565 if (!Fn) { 4566 Diag(DelLoc, diag::err_deleted_non_function); 4567 return; 4568 } 4569 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4570 Diag(DelLoc, diag::err_deleted_decl_not_first); 4571 Diag(Prev->getLocation(), diag::note_previous_declaration); 4572 // If the declaration wasn't the first, we delete the function anyway for 4573 // recovery. 4574 } 4575 Fn->setDeleted(); 4576} 4577 4578static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4579 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4580 ++CI) { 4581 Stmt *SubStmt = *CI; 4582 if (!SubStmt) 4583 continue; 4584 if (isa<ReturnStmt>(SubStmt)) 4585 Self.Diag(SubStmt->getSourceRange().getBegin(), 4586 diag::err_return_in_constructor_handler); 4587 if (!isa<Expr>(SubStmt)) 4588 SearchForReturnInStmt(Self, SubStmt); 4589 } 4590} 4591 4592void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4593 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4594 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4595 SearchForReturnInStmt(*this, Handler); 4596 } 4597} 4598 4599bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4600 const CXXMethodDecl *Old) { 4601 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4602 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4603 4604 QualType CNewTy = Context.getCanonicalType(NewTy); 4605 QualType COldTy = Context.getCanonicalType(OldTy); 4606 4607 if (CNewTy == COldTy && 4608 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 4609 return false; 4610 4611 // Check if the return types are covariant 4612 QualType NewClassTy, OldClassTy; 4613 4614 /// Both types must be pointers or references to classes. 4615 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4616 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4617 NewClassTy = NewPT->getPointeeType(); 4618 OldClassTy = OldPT->getPointeeType(); 4619 } 4620 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4621 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4622 NewClassTy = NewRT->getPointeeType(); 4623 OldClassTy = OldRT->getPointeeType(); 4624 } 4625 } 4626 4627 // The return types aren't either both pointers or references to a class type. 4628 if (NewClassTy.isNull()) { 4629 Diag(New->getLocation(), 4630 diag::err_different_return_type_for_overriding_virtual_function) 4631 << New->getDeclName() << NewTy << OldTy; 4632 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4633 4634 return true; 4635 } 4636 4637 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 4638 // Check if the new class derives from the old class. 4639 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4640 Diag(New->getLocation(), 4641 diag::err_covariant_return_not_derived) 4642 << New->getDeclName() << NewTy << OldTy; 4643 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4644 return true; 4645 } 4646 4647 // Check if we the conversion from derived to base is valid. 4648 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4649 diag::err_covariant_return_inaccessible_base, 4650 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4651 // FIXME: Should this point to the return type? 4652 New->getLocation(), SourceRange(), New->getDeclName())) { 4653 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4654 return true; 4655 } 4656 } 4657 4658 // The qualifiers of the return types must be the same. 4659 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 4660 Diag(New->getLocation(), 4661 diag::err_covariant_return_type_different_qualifications) 4662 << New->getDeclName() << NewTy << OldTy; 4663 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4664 return true; 4665 }; 4666 4667 4668 // The new class type must have the same or less qualifiers as the old type. 4669 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4670 Diag(New->getLocation(), 4671 diag::err_covariant_return_type_class_type_more_qualified) 4672 << New->getDeclName() << NewTy << OldTy; 4673 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4674 return true; 4675 }; 4676 4677 return false; 4678} 4679 4680/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4681/// initializer for the declaration 'Dcl'. 4682/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4683/// static data member of class X, names should be looked up in the scope of 4684/// class X. 4685void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4686 AdjustDeclIfTemplate(Dcl); 4687 4688 Decl *D = Dcl.getAs<Decl>(); 4689 // If there is no declaration, there was an error parsing it. 4690 if (D == 0) 4691 return; 4692 4693 // Check whether it is a declaration with a nested name specifier like 4694 // int foo::bar; 4695 if (!D->isOutOfLine()) 4696 return; 4697 4698 // C++ [basic.lookup.unqual]p13 4699 // 4700 // A name used in the definition of a static data member of class X 4701 // (after the qualified-id of the static member) is looked up as if the name 4702 // was used in a member function of X. 4703 4704 // Change current context into the context of the initializing declaration. 4705 EnterDeclaratorContext(S, D->getDeclContext()); 4706} 4707 4708/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4709/// initializer for the declaration 'Dcl'. 4710void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4711 AdjustDeclIfTemplate(Dcl); 4712 4713 Decl *D = Dcl.getAs<Decl>(); 4714 // If there is no declaration, there was an error parsing it. 4715 if (D == 0) 4716 return; 4717 4718 // Check whether it is a declaration with a nested name specifier like 4719 // int foo::bar; 4720 if (!D->isOutOfLine()) 4721 return; 4722 4723 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4724 ExitDeclaratorContext(S); 4725} 4726