SemaDeclCXX.cpp revision 12c118a8ff9f61a4d63146fe1a5c0d60987f99bb
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 UnqualifiedId &Name, 2704 AttributeList *AttrList, 2705 bool IsTypeName) { 2706 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2707 2708 switch (Name.getKind()) { 2709 case UnqualifiedId::IK_Identifier: 2710 case UnqualifiedId::IK_OperatorFunctionId: 2711 case UnqualifiedId::IK_ConversionFunctionId: 2712 break; 2713 2714 case UnqualifiedId::IK_ConstructorName: 2715 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2716 << SS.getRange(); 2717 return DeclPtrTy(); 2718 2719 case UnqualifiedId::IK_DestructorName: 2720 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2721 << SS.getRange(); 2722 return DeclPtrTy(); 2723 2724 case UnqualifiedId::IK_TemplateId: 2725 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2726 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2727 return DeclPtrTy(); 2728 } 2729 2730 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2731 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, 2732 Name.getSourceRange().getBegin(), 2733 TargetName, AttrList, IsTypeName); 2734 if (UD) { 2735 PushOnScopeChains(UD, S); 2736 UD->setAccess(AS); 2737 } 2738 2739 return DeclPtrTy::make(UD); 2740} 2741 2742NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2743 const CXXScopeSpec &SS, 2744 SourceLocation IdentLoc, 2745 DeclarationName Name, 2746 AttributeList *AttrList, 2747 bool IsTypeName) { 2748 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2749 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2750 2751 // FIXME: We ignore attributes for now. 2752 delete AttrList; 2753 2754 if (SS.isEmpty()) { 2755 Diag(IdentLoc, diag::err_using_requires_qualname); 2756 return 0; 2757 } 2758 2759 NestedNameSpecifier *NNS = 2760 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2761 2762 if (isUnknownSpecialization(SS)) { 2763 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2764 SS.getRange(), NNS, 2765 IdentLoc, Name, IsTypeName); 2766 } 2767 2768 DeclContext *LookupContext = 0; 2769 2770 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2771 // C++0x N2914 [namespace.udecl]p3: 2772 // A using-declaration used as a member-declaration shall refer to a member 2773 // of a base class of the class being defined, shall refer to a member of an 2774 // anonymous union that is a member of a base class of the class being 2775 // defined, or shall refer to an enumerator for an enumeration type that is 2776 // a member of a base class of the class being defined. 2777 const Type *Ty = NNS->getAsType(); 2778 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) { 2779 Diag(SS.getRange().getBegin(), 2780 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2781 << NNS << RD->getDeclName(); 2782 return 0; 2783 } 2784 2785 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0)); 2786 LookupContext = BaseTy->getAs<RecordType>()->getDecl(); 2787 } else { 2788 // C++0x N2914 [namespace.udecl]p8: 2789 // A using-declaration for a class member shall be a member-declaration. 2790 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) { 2791 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2792 << SS.getRange(); 2793 return 0; 2794 } 2795 2796 // C++0x N2914 [namespace.udecl]p9: 2797 // In a using-declaration, a prefix :: refers to the global namespace. 2798 if (NNS->getKind() == NestedNameSpecifier::Global) 2799 LookupContext = Context.getTranslationUnitDecl(); 2800 else 2801 LookupContext = NNS->getAsNamespace(); 2802 } 2803 2804 2805 // Lookup target name. 2806 LookupResult R; 2807 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName); 2808 2809 if (R.empty()) { 2810 Diag(IdentLoc, diag::err_no_member) 2811 << Name << LookupContext << SS.getRange(); 2812 return 0; 2813 } 2814 2815 // FIXME: handle ambiguity? 2816 NamedDecl *ND = R.getAsSingleDecl(Context); 2817 2818 if (IsTypeName && !isa<TypeDecl>(ND)) { 2819 Diag(IdentLoc, diag::err_using_typename_non_type); 2820 return 0; 2821 } 2822 2823 // C++0x N2914 [namespace.udecl]p6: 2824 // A using-declaration shall not name a namespace. 2825 if (isa<NamespaceDecl>(ND)) { 2826 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2827 << SS.getRange(); 2828 return 0; 2829 } 2830 2831 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2832 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2833} 2834 2835/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2836/// is a namespace alias, returns the namespace it points to. 2837static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2838 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2839 return AD->getNamespace(); 2840 return dyn_cast_or_null<NamespaceDecl>(D); 2841} 2842 2843Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2844 SourceLocation NamespaceLoc, 2845 SourceLocation AliasLoc, 2846 IdentifierInfo *Alias, 2847 const CXXScopeSpec &SS, 2848 SourceLocation IdentLoc, 2849 IdentifierInfo *Ident) { 2850 2851 // Lookup the namespace name. 2852 LookupResult R; 2853 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false); 2854 2855 // Check if we have a previous declaration with the same name. 2856 if (NamedDecl *PrevDecl 2857 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) { 2858 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2859 // We already have an alias with the same name that points to the same 2860 // namespace, so don't create a new one. 2861 if (!R.isAmbiguous() && !R.empty() && 2862 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 2863 return DeclPtrTy(); 2864 } 2865 2866 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2867 diag::err_redefinition_different_kind; 2868 Diag(AliasLoc, DiagID) << Alias; 2869 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2870 return DeclPtrTy(); 2871 } 2872 2873 if (R.isAmbiguous()) { 2874 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2875 return DeclPtrTy(); 2876 } 2877 2878 if (R.empty()) { 2879 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2880 return DeclPtrTy(); 2881 } 2882 2883 NamespaceAliasDecl *AliasDecl = 2884 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2885 Alias, SS.getRange(), 2886 (NestedNameSpecifier *)SS.getScopeRep(), 2887 IdentLoc, R.getFoundDecl()); 2888 2889 CurContext->addDecl(AliasDecl); 2890 return DeclPtrTy::make(AliasDecl); 2891} 2892 2893void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2894 CXXConstructorDecl *Constructor) { 2895 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2896 !Constructor->isUsed()) && 2897 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2898 2899 CXXRecordDecl *ClassDecl 2900 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2901 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2902 // Before the implicitly-declared default constructor for a class is 2903 // implicitly defined, all the implicitly-declared default constructors 2904 // for its base class and its non-static data members shall have been 2905 // implicitly defined. 2906 bool err = false; 2907 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2908 E = ClassDecl->bases_end(); Base != E; ++Base) { 2909 CXXRecordDecl *BaseClassDecl 2910 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2911 if (!BaseClassDecl->hasTrivialConstructor()) { 2912 if (CXXConstructorDecl *BaseCtor = 2913 BaseClassDecl->getDefaultConstructor(Context)) 2914 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2915 else { 2916 Diag(CurrentLocation, diag::err_defining_default_ctor) 2917 << Context.getTagDeclType(ClassDecl) << 0 2918 << Context.getTagDeclType(BaseClassDecl); 2919 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2920 << Context.getTagDeclType(BaseClassDecl); 2921 err = true; 2922 } 2923 } 2924 } 2925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2926 E = ClassDecl->field_end(); Field != E; ++Field) { 2927 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2928 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2929 FieldType = Array->getElementType(); 2930 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2931 CXXRecordDecl *FieldClassDecl 2932 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2933 if (!FieldClassDecl->hasTrivialConstructor()) { 2934 if (CXXConstructorDecl *FieldCtor = 2935 FieldClassDecl->getDefaultConstructor(Context)) 2936 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2937 else { 2938 Diag(CurrentLocation, diag::err_defining_default_ctor) 2939 << Context.getTagDeclType(ClassDecl) << 1 << 2940 Context.getTagDeclType(FieldClassDecl); 2941 Diag((*Field)->getLocation(), diag::note_field_decl); 2942 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2943 << Context.getTagDeclType(FieldClassDecl); 2944 err = true; 2945 } 2946 } 2947 } else if (FieldType->isReferenceType()) { 2948 Diag(CurrentLocation, diag::err_unintialized_member) 2949 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2950 Diag((*Field)->getLocation(), diag::note_declared_at); 2951 err = true; 2952 } else if (FieldType.isConstQualified()) { 2953 Diag(CurrentLocation, diag::err_unintialized_member) 2954 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2955 Diag((*Field)->getLocation(), diag::note_declared_at); 2956 err = true; 2957 } 2958 } 2959 if (!err) 2960 Constructor->setUsed(); 2961 else 2962 Constructor->setInvalidDecl(); 2963} 2964 2965void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2966 CXXDestructorDecl *Destructor) { 2967 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2968 "DefineImplicitDestructor - call it for implicit default dtor"); 2969 2970 CXXRecordDecl *ClassDecl 2971 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2972 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2973 // C++ [class.dtor] p5 2974 // Before the implicitly-declared default destructor for a class is 2975 // implicitly defined, all the implicitly-declared default destructors 2976 // for its base class and its non-static data members shall have been 2977 // implicitly defined. 2978 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2979 E = ClassDecl->bases_end(); Base != E; ++Base) { 2980 CXXRecordDecl *BaseClassDecl 2981 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2982 if (!BaseClassDecl->hasTrivialDestructor()) { 2983 if (CXXDestructorDecl *BaseDtor = 2984 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2985 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2986 else 2987 assert(false && 2988 "DefineImplicitDestructor - missing dtor in a base class"); 2989 } 2990 } 2991 2992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2993 E = ClassDecl->field_end(); Field != E; ++Field) { 2994 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2995 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2996 FieldType = Array->getElementType(); 2997 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2998 CXXRecordDecl *FieldClassDecl 2999 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3000 if (!FieldClassDecl->hasTrivialDestructor()) { 3001 if (CXXDestructorDecl *FieldDtor = 3002 const_cast<CXXDestructorDecl*>( 3003 FieldClassDecl->getDestructor(Context))) 3004 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3005 else 3006 assert(false && 3007 "DefineImplicitDestructor - missing dtor in class of a data member"); 3008 } 3009 } 3010 } 3011 Destructor->setUsed(); 3012} 3013 3014void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3015 CXXMethodDecl *MethodDecl) { 3016 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3017 MethodDecl->getOverloadedOperator() == OO_Equal && 3018 !MethodDecl->isUsed()) && 3019 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3020 3021 CXXRecordDecl *ClassDecl 3022 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3023 3024 // C++[class.copy] p12 3025 // Before the implicitly-declared copy assignment operator for a class is 3026 // implicitly defined, all implicitly-declared copy assignment operators 3027 // for its direct base classes and its nonstatic data members shall have 3028 // been implicitly defined. 3029 bool err = false; 3030 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3031 E = ClassDecl->bases_end(); Base != E; ++Base) { 3032 CXXRecordDecl *BaseClassDecl 3033 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3034 if (CXXMethodDecl *BaseAssignOpMethod = 3035 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3036 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3037 } 3038 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3039 E = ClassDecl->field_end(); Field != E; ++Field) { 3040 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3041 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3042 FieldType = Array->getElementType(); 3043 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3044 CXXRecordDecl *FieldClassDecl 3045 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3046 if (CXXMethodDecl *FieldAssignOpMethod = 3047 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3048 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3049 } else if (FieldType->isReferenceType()) { 3050 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3051 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3052 Diag(Field->getLocation(), diag::note_declared_at); 3053 Diag(CurrentLocation, diag::note_first_required_here); 3054 err = true; 3055 } else if (FieldType.isConstQualified()) { 3056 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3057 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3058 Diag(Field->getLocation(), diag::note_declared_at); 3059 Diag(CurrentLocation, diag::note_first_required_here); 3060 err = true; 3061 } 3062 } 3063 if (!err) 3064 MethodDecl->setUsed(); 3065} 3066 3067CXXMethodDecl * 3068Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3069 CXXRecordDecl *ClassDecl) { 3070 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3071 QualType RHSType(LHSType); 3072 // If class's assignment operator argument is const/volatile qualified, 3073 // look for operator = (const/volatile B&). Otherwise, look for 3074 // operator = (B&). 3075 RHSType = Context.getCVRQualifiedType(RHSType, 3076 ParmDecl->getType().getCVRQualifiers()); 3077 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3078 LHSType, 3079 SourceLocation())); 3080 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3081 RHSType, 3082 SourceLocation())); 3083 Expr *Args[2] = { &*LHS, &*RHS }; 3084 OverloadCandidateSet CandidateSet; 3085 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3086 CandidateSet); 3087 OverloadCandidateSet::iterator Best; 3088 if (BestViableFunction(CandidateSet, 3089 ClassDecl->getLocation(), Best) == OR_Success) 3090 return cast<CXXMethodDecl>(Best->Function); 3091 assert(false && 3092 "getAssignOperatorMethod - copy assignment operator method not found"); 3093 return 0; 3094} 3095 3096void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3097 CXXConstructorDecl *CopyConstructor, 3098 unsigned TypeQuals) { 3099 assert((CopyConstructor->isImplicit() && 3100 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3101 !CopyConstructor->isUsed()) && 3102 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3103 3104 CXXRecordDecl *ClassDecl 3105 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3106 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3107 // C++ [class.copy] p209 3108 // Before the implicitly-declared copy constructor for a class is 3109 // implicitly defined, all the implicitly-declared copy constructors 3110 // for its base class and its non-static data members shall have been 3111 // implicitly defined. 3112 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3113 Base != ClassDecl->bases_end(); ++Base) { 3114 CXXRecordDecl *BaseClassDecl 3115 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3116 if (CXXConstructorDecl *BaseCopyCtor = 3117 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3118 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3119 } 3120 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3121 FieldEnd = ClassDecl->field_end(); 3122 Field != FieldEnd; ++Field) { 3123 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3124 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3125 FieldType = Array->getElementType(); 3126 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3127 CXXRecordDecl *FieldClassDecl 3128 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3129 if (CXXConstructorDecl *FieldCopyCtor = 3130 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3131 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3132 } 3133 } 3134 CopyConstructor->setUsed(); 3135} 3136 3137Sema::OwningExprResult 3138Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3139 CXXConstructorDecl *Constructor, 3140 MultiExprArg ExprArgs) { 3141 bool Elidable = false; 3142 3143 // C++ [class.copy]p15: 3144 // Whenever a temporary class object is copied using a copy constructor, and 3145 // this object and the copy have the same cv-unqualified type, an 3146 // implementation is permitted to treat the original and the copy as two 3147 // different ways of referring to the same object and not perform a copy at 3148 // all, even if the class copy constructor or destructor have side effects. 3149 3150 // FIXME: Is this enough? 3151 if (Constructor->isCopyConstructor(Context)) { 3152 Expr *E = ((Expr **)ExprArgs.get())[0]; 3153 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3154 E = BE->getSubExpr(); 3155 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3156 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3157 E = ICE->getSubExpr(); 3158 3159 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3160 Elidable = true; 3161 } 3162 3163 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3164 Elidable, move(ExprArgs)); 3165} 3166 3167/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3168/// including handling of its default argument expressions. 3169Sema::OwningExprResult 3170Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3171 CXXConstructorDecl *Constructor, bool Elidable, 3172 MultiExprArg ExprArgs) { 3173 unsigned NumExprs = ExprArgs.size(); 3174 Expr **Exprs = (Expr **)ExprArgs.release(); 3175 3176 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3177 Elidable, Exprs, NumExprs)); 3178} 3179 3180Sema::OwningExprResult 3181Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3182 QualType Ty, 3183 SourceLocation TyBeginLoc, 3184 MultiExprArg Args, 3185 SourceLocation RParenLoc) { 3186 unsigned NumExprs = Args.size(); 3187 Expr **Exprs = (Expr **)Args.release(); 3188 3189 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3190 TyBeginLoc, Exprs, 3191 NumExprs, RParenLoc)); 3192} 3193 3194 3195bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3196 CXXConstructorDecl *Constructor, 3197 MultiExprArg Exprs) { 3198 OwningExprResult TempResult = 3199 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3200 move(Exprs)); 3201 if (TempResult.isInvalid()) 3202 return true; 3203 3204 Expr *Temp = TempResult.takeAs<Expr>(); 3205 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3206 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3207 VD->setInit(Context, Temp); 3208 3209 return false; 3210} 3211 3212void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3213 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3214 DeclInitType->getAs<RecordType>()->getDecl()); 3215 if (!ClassDecl->hasTrivialDestructor()) 3216 if (CXXDestructorDecl *Destructor = 3217 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3218 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3219} 3220 3221/// AddCXXDirectInitializerToDecl - This action is called immediately after 3222/// ActOnDeclarator, when a C++ direct initializer is present. 3223/// e.g: "int x(1);" 3224void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3225 SourceLocation LParenLoc, 3226 MultiExprArg Exprs, 3227 SourceLocation *CommaLocs, 3228 SourceLocation RParenLoc) { 3229 unsigned NumExprs = Exprs.size(); 3230 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3231 Decl *RealDecl = Dcl.getAs<Decl>(); 3232 3233 // If there is no declaration, there was an error parsing it. Just ignore 3234 // the initializer. 3235 if (RealDecl == 0) 3236 return; 3237 3238 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3239 if (!VDecl) { 3240 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3241 RealDecl->setInvalidDecl(); 3242 return; 3243 } 3244 3245 // We will represent direct-initialization similarly to copy-initialization: 3246 // int x(1); -as-> int x = 1; 3247 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3248 // 3249 // Clients that want to distinguish between the two forms, can check for 3250 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3251 // A major benefit is that clients that don't particularly care about which 3252 // exactly form was it (like the CodeGen) can handle both cases without 3253 // special case code. 3254 3255 // If either the declaration has a dependent type or if any of the expressions 3256 // is type-dependent, we represent the initialization via a ParenListExpr for 3257 // later use during template instantiation. 3258 if (VDecl->getType()->isDependentType() || 3259 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3260 // Let clients know that initialization was done with a direct initializer. 3261 VDecl->setCXXDirectInitializer(true); 3262 3263 // Store the initialization expressions as a ParenListExpr. 3264 unsigned NumExprs = Exprs.size(); 3265 VDecl->setInit(Context, 3266 new (Context) ParenListExpr(Context, LParenLoc, 3267 (Expr **)Exprs.release(), 3268 NumExprs, RParenLoc)); 3269 return; 3270 } 3271 3272 3273 // C++ 8.5p11: 3274 // The form of initialization (using parentheses or '=') is generally 3275 // insignificant, but does matter when the entity being initialized has a 3276 // class type. 3277 QualType DeclInitType = VDecl->getType(); 3278 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3279 DeclInitType = Context.getBaseElementType(Array); 3280 3281 // FIXME: This isn't the right place to complete the type. 3282 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3283 diag::err_typecheck_decl_incomplete_type)) { 3284 VDecl->setInvalidDecl(); 3285 return; 3286 } 3287 3288 if (VDecl->getType()->isRecordType()) { 3289 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3290 3291 CXXConstructorDecl *Constructor 3292 = PerformInitializationByConstructor(DeclInitType, 3293 move(Exprs), 3294 VDecl->getLocation(), 3295 SourceRange(VDecl->getLocation(), 3296 RParenLoc), 3297 VDecl->getDeclName(), 3298 IK_Direct, 3299 ConstructorArgs); 3300 if (!Constructor) 3301 RealDecl->setInvalidDecl(); 3302 else { 3303 VDecl->setCXXDirectInitializer(true); 3304 if (InitializeVarWithConstructor(VDecl, Constructor, 3305 move_arg(ConstructorArgs))) 3306 RealDecl->setInvalidDecl(); 3307 FinalizeVarWithDestructor(VDecl, DeclInitType); 3308 } 3309 return; 3310 } 3311 3312 if (NumExprs > 1) { 3313 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3314 << SourceRange(VDecl->getLocation(), RParenLoc); 3315 RealDecl->setInvalidDecl(); 3316 return; 3317 } 3318 3319 // Let clients know that initialization was done with a direct initializer. 3320 VDecl->setCXXDirectInitializer(true); 3321 3322 assert(NumExprs == 1 && "Expected 1 expression"); 3323 // Set the init expression, handles conversions. 3324 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3325 /*DirectInit=*/true); 3326} 3327 3328/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3329/// may occur as part of direct-initialization or copy-initialization. 3330/// 3331/// \param ClassType the type of the object being initialized, which must have 3332/// class type. 3333/// 3334/// \param ArgsPtr the arguments provided to initialize the object 3335/// 3336/// \param Loc the source location where the initialization occurs 3337/// 3338/// \param Range the source range that covers the entire initialization 3339/// 3340/// \param InitEntity the name of the entity being initialized, if known 3341/// 3342/// \param Kind the type of initialization being performed 3343/// 3344/// \param ConvertedArgs a vector that will be filled in with the 3345/// appropriately-converted arguments to the constructor (if initialization 3346/// succeeded). 3347/// 3348/// \returns the constructor used to initialize the object, if successful. 3349/// Otherwise, emits a diagnostic and returns NULL. 3350CXXConstructorDecl * 3351Sema::PerformInitializationByConstructor(QualType ClassType, 3352 MultiExprArg ArgsPtr, 3353 SourceLocation Loc, SourceRange Range, 3354 DeclarationName InitEntity, 3355 InitializationKind Kind, 3356 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3357 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3358 assert(ClassRec && "Can only initialize a class type here"); 3359 Expr **Args = (Expr **)ArgsPtr.get(); 3360 unsigned NumArgs = ArgsPtr.size(); 3361 3362 // C++ [dcl.init]p14: 3363 // If the initialization is direct-initialization, or if it is 3364 // copy-initialization where the cv-unqualified version of the 3365 // source type is the same class as, or a derived class of, the 3366 // class of the destination, constructors are considered. The 3367 // applicable constructors are enumerated (13.3.1.3), and the 3368 // best one is chosen through overload resolution (13.3). The 3369 // constructor so selected is called to initialize the object, 3370 // with the initializer expression(s) as its argument(s). If no 3371 // constructor applies, or the overload resolution is ambiguous, 3372 // the initialization is ill-formed. 3373 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3374 OverloadCandidateSet CandidateSet; 3375 3376 // Add constructors to the overload set. 3377 DeclarationName ConstructorName 3378 = Context.DeclarationNames.getCXXConstructorName( 3379 Context.getCanonicalType(ClassType.getUnqualifiedType())); 3380 DeclContext::lookup_const_iterator Con, ConEnd; 3381 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3382 Con != ConEnd; ++Con) { 3383 // Find the constructor (which may be a template). 3384 CXXConstructorDecl *Constructor = 0; 3385 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3386 if (ConstructorTmpl) 3387 Constructor 3388 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3389 else 3390 Constructor = cast<CXXConstructorDecl>(*Con); 3391 3392 if ((Kind == IK_Direct) || 3393 (Kind == IK_Copy && 3394 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3395 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 3396 if (ConstructorTmpl) 3397 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3398 Args, NumArgs, CandidateSet); 3399 else 3400 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3401 } 3402 } 3403 3404 // FIXME: When we decide not to synthesize the implicitly-declared 3405 // constructors, we'll need to make them appear here. 3406 3407 OverloadCandidateSet::iterator Best; 3408 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3409 case OR_Success: 3410 // We found a constructor. Break out so that we can convert the arguments 3411 // appropriately. 3412 break; 3413 3414 case OR_No_Viable_Function: 3415 if (InitEntity) 3416 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3417 << InitEntity << Range; 3418 else 3419 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3420 << ClassType << Range; 3421 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3422 return 0; 3423 3424 case OR_Ambiguous: 3425 if (InitEntity) 3426 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3427 else 3428 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3429 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3430 return 0; 3431 3432 case OR_Deleted: 3433 if (InitEntity) 3434 Diag(Loc, diag::err_ovl_deleted_init) 3435 << Best->Function->isDeleted() 3436 << InitEntity << Range; 3437 else 3438 Diag(Loc, diag::err_ovl_deleted_init) 3439 << Best->Function->isDeleted() 3440 << InitEntity << Range; 3441 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3442 return 0; 3443 } 3444 3445 // Convert the arguments, fill in default arguments, etc. 3446 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3447 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3448 return 0; 3449 3450 return Constructor; 3451} 3452 3453/// \brief Given a constructor and the set of arguments provided for the 3454/// constructor, convert the arguments and add any required default arguments 3455/// to form a proper call to this constructor. 3456/// 3457/// \returns true if an error occurred, false otherwise. 3458bool 3459Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3460 MultiExprArg ArgsPtr, 3461 SourceLocation Loc, 3462 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3463 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3464 unsigned NumArgs = ArgsPtr.size(); 3465 Expr **Args = (Expr **)ArgsPtr.get(); 3466 3467 const FunctionProtoType *Proto 3468 = Constructor->getType()->getAs<FunctionProtoType>(); 3469 assert(Proto && "Constructor without a prototype?"); 3470 unsigned NumArgsInProto = Proto->getNumArgs(); 3471 unsigned NumArgsToCheck = NumArgs; 3472 3473 // If too few arguments are available, we'll fill in the rest with defaults. 3474 if (NumArgs < NumArgsInProto) { 3475 NumArgsToCheck = NumArgsInProto; 3476 ConvertedArgs.reserve(NumArgsInProto); 3477 } else { 3478 ConvertedArgs.reserve(NumArgs); 3479 if (NumArgs > NumArgsInProto) 3480 NumArgsToCheck = NumArgsInProto; 3481 } 3482 3483 // Convert arguments 3484 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3485 QualType ProtoArgType = Proto->getArgType(i); 3486 3487 Expr *Arg; 3488 if (i < NumArgs) { 3489 Arg = Args[i]; 3490 3491 // Pass the argument. 3492 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3493 return true; 3494 3495 Args[i] = 0; 3496 } else { 3497 ParmVarDecl *Param = Constructor->getParamDecl(i); 3498 3499 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3500 if (DefArg.isInvalid()) 3501 return true; 3502 3503 Arg = DefArg.takeAs<Expr>(); 3504 } 3505 3506 ConvertedArgs.push_back(Arg); 3507 } 3508 3509 // If this is a variadic call, handle args passed through "...". 3510 if (Proto->isVariadic()) { 3511 // Promote the arguments (C99 6.5.2.2p7). 3512 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3513 Expr *Arg = Args[i]; 3514 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3515 return true; 3516 3517 ConvertedArgs.push_back(Arg); 3518 Args[i] = 0; 3519 } 3520 } 3521 3522 return false; 3523} 3524 3525/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3526/// determine whether they are reference-related, 3527/// reference-compatible, reference-compatible with added 3528/// qualification, or incompatible, for use in C++ initialization by 3529/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3530/// type, and the first type (T1) is the pointee type of the reference 3531/// type being initialized. 3532Sema::ReferenceCompareResult 3533Sema::CompareReferenceRelationship(QualType T1, QualType T2, 3534 bool& DerivedToBase) { 3535 assert(!T1->isReferenceType() && 3536 "T1 must be the pointee type of the reference type"); 3537 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 3538 3539 T1 = Context.getCanonicalType(T1); 3540 T2 = Context.getCanonicalType(T2); 3541 QualType UnqualT1 = T1.getUnqualifiedType(); 3542 QualType UnqualT2 = T2.getUnqualifiedType(); 3543 3544 // C++ [dcl.init.ref]p4: 3545 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3546 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3547 // T1 is a base class of T2. 3548 if (UnqualT1 == UnqualT2) 3549 DerivedToBase = false; 3550 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 3551 DerivedToBase = true; 3552 else 3553 return Ref_Incompatible; 3554 3555 // At this point, we know that T1 and T2 are reference-related (at 3556 // least). 3557 3558 // C++ [dcl.init.ref]p4: 3559 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3560 // reference-related to T2 and cv1 is the same cv-qualification 3561 // as, or greater cv-qualification than, cv2. For purposes of 3562 // overload resolution, cases for which cv1 is greater 3563 // cv-qualification than cv2 are identified as 3564 // reference-compatible with added qualification (see 13.3.3.2). 3565 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3566 return Ref_Compatible; 3567 else if (T1.isMoreQualifiedThan(T2)) 3568 return Ref_Compatible_With_Added_Qualification; 3569 else 3570 return Ref_Related; 3571} 3572 3573/// CheckReferenceInit - Check the initialization of a reference 3574/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3575/// the initializer (either a simple initializer or an initializer 3576/// list), and DeclType is the type of the declaration. When ICS is 3577/// non-null, this routine will compute the implicit conversion 3578/// sequence according to C++ [over.ics.ref] and will not produce any 3579/// diagnostics; when ICS is null, it will emit diagnostics when any 3580/// errors are found. Either way, a return value of true indicates 3581/// that there was a failure, a return value of false indicates that 3582/// the reference initialization succeeded. 3583/// 3584/// When @p SuppressUserConversions, user-defined conversions are 3585/// suppressed. 3586/// When @p AllowExplicit, we also permit explicit user-defined 3587/// conversion functions. 3588/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3589bool 3590Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3591 SourceLocation DeclLoc, 3592 bool SuppressUserConversions, 3593 bool AllowExplicit, bool ForceRValue, 3594 ImplicitConversionSequence *ICS) { 3595 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3596 3597 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3598 QualType T2 = Init->getType(); 3599 3600 // If the initializer is the address of an overloaded function, try 3601 // to resolve the overloaded function. If all goes well, T2 is the 3602 // type of the resulting function. 3603 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3604 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3605 ICS != 0); 3606 if (Fn) { 3607 // Since we're performing this reference-initialization for 3608 // real, update the initializer with the resulting function. 3609 if (!ICS) { 3610 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3611 return true; 3612 3613 Init = FixOverloadedFunctionReference(Init, Fn); 3614 } 3615 3616 T2 = Fn->getType(); 3617 } 3618 } 3619 3620 // Compute some basic properties of the types and the initializer. 3621 bool isRValRef = DeclType->isRValueReferenceType(); 3622 bool DerivedToBase = false; 3623 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3624 Init->isLvalue(Context); 3625 ReferenceCompareResult RefRelationship 3626 = CompareReferenceRelationship(T1, T2, DerivedToBase); 3627 3628 // Most paths end in a failed conversion. 3629 if (ICS) 3630 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3631 3632 // C++ [dcl.init.ref]p5: 3633 // A reference to type "cv1 T1" is initialized by an expression 3634 // of type "cv2 T2" as follows: 3635 3636 // -- If the initializer expression 3637 3638 // Rvalue references cannot bind to lvalues (N2812). 3639 // There is absolutely no situation where they can. In particular, note that 3640 // this is ill-formed, even if B has a user-defined conversion to A&&: 3641 // B b; 3642 // A&& r = b; 3643 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3644 if (!ICS) 3645 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3646 << Init->getSourceRange(); 3647 return true; 3648 } 3649 3650 bool BindsDirectly = false; 3651 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3652 // reference-compatible with "cv2 T2," or 3653 // 3654 // Note that the bit-field check is skipped if we are just computing 3655 // the implicit conversion sequence (C++ [over.best.ics]p2). 3656 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3657 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3658 BindsDirectly = true; 3659 3660 if (ICS) { 3661 // C++ [over.ics.ref]p1: 3662 // When a parameter of reference type binds directly (8.5.3) 3663 // to an argument expression, the implicit conversion sequence 3664 // is the identity conversion, unless the argument expression 3665 // has a type that is a derived class of the parameter type, 3666 // in which case the implicit conversion sequence is a 3667 // derived-to-base Conversion (13.3.3.1). 3668 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3669 ICS->Standard.First = ICK_Identity; 3670 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3671 ICS->Standard.Third = ICK_Identity; 3672 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3673 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3674 ICS->Standard.ReferenceBinding = true; 3675 ICS->Standard.DirectBinding = true; 3676 ICS->Standard.RRefBinding = false; 3677 ICS->Standard.CopyConstructor = 0; 3678 3679 // Nothing more to do: the inaccessibility/ambiguity check for 3680 // derived-to-base conversions is suppressed when we're 3681 // computing the implicit conversion sequence (C++ 3682 // [over.best.ics]p2). 3683 return false; 3684 } else { 3685 // Perform the conversion. 3686 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3687 if (DerivedToBase) 3688 CK = CastExpr::CK_DerivedToBase; 3689 else if(CheckExceptionSpecCompatibility(Init, T1)) 3690 return true; 3691 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3692 } 3693 } 3694 3695 // -- has a class type (i.e., T2 is a class type) and can be 3696 // implicitly converted to an lvalue of type "cv3 T3," 3697 // where "cv1 T1" is reference-compatible with "cv3 T3" 3698 // 92) (this conversion is selected by enumerating the 3699 // applicable conversion functions (13.3.1.6) and choosing 3700 // the best one through overload resolution (13.3)), 3701 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3702 !RequireCompleteType(DeclLoc, T2, 0)) { 3703 CXXRecordDecl *T2RecordDecl 3704 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3705 3706 OverloadCandidateSet CandidateSet; 3707 OverloadedFunctionDecl *Conversions 3708 = T2RecordDecl->getVisibleConversionFunctions(); 3709 for (OverloadedFunctionDecl::function_iterator Func 3710 = Conversions->function_begin(); 3711 Func != Conversions->function_end(); ++Func) { 3712 FunctionTemplateDecl *ConvTemplate 3713 = dyn_cast<FunctionTemplateDecl>(*Func); 3714 CXXConversionDecl *Conv; 3715 if (ConvTemplate) 3716 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3717 else 3718 Conv = cast<CXXConversionDecl>(*Func); 3719 3720 // If the conversion function doesn't return a reference type, 3721 // it can't be considered for this conversion. 3722 if (Conv->getConversionType()->isLValueReferenceType() && 3723 (AllowExplicit || !Conv->isExplicit())) { 3724 if (ConvTemplate) 3725 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3726 CandidateSet); 3727 else 3728 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3729 } 3730 } 3731 3732 OverloadCandidateSet::iterator Best; 3733 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3734 case OR_Success: 3735 // This is a direct binding. 3736 BindsDirectly = true; 3737 3738 if (ICS) { 3739 // C++ [over.ics.ref]p1: 3740 // 3741 // [...] If the parameter binds directly to the result of 3742 // applying a conversion function to the argument 3743 // expression, the implicit conversion sequence is a 3744 // user-defined conversion sequence (13.3.3.1.2), with the 3745 // second standard conversion sequence either an identity 3746 // conversion or, if the conversion function returns an 3747 // entity of a type that is a derived class of the parameter 3748 // type, a derived-to-base Conversion. 3749 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3750 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3751 ICS->UserDefined.After = Best->FinalConversion; 3752 ICS->UserDefined.ConversionFunction = Best->Function; 3753 assert(ICS->UserDefined.After.ReferenceBinding && 3754 ICS->UserDefined.After.DirectBinding && 3755 "Expected a direct reference binding!"); 3756 return false; 3757 } else { 3758 OwningExprResult InitConversion = 3759 BuildCXXCastArgument(DeclLoc, QualType(), 3760 CastExpr::CK_UserDefinedConversion, 3761 cast<CXXMethodDecl>(Best->Function), 3762 Owned(Init)); 3763 Init = InitConversion.takeAs<Expr>(); 3764 3765 if (CheckExceptionSpecCompatibility(Init, T1)) 3766 return true; 3767 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3768 /*isLvalue=*/true); 3769 } 3770 break; 3771 3772 case OR_Ambiguous: 3773 if (ICS) { 3774 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3775 Cand != CandidateSet.end(); ++Cand) 3776 if (Cand->Viable) 3777 ICS->ConversionFunctionSet.push_back(Cand->Function); 3778 break; 3779 } 3780 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3781 << Init->getSourceRange(); 3782 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3783 return true; 3784 3785 case OR_No_Viable_Function: 3786 case OR_Deleted: 3787 // There was no suitable conversion, or we found a deleted 3788 // conversion; continue with other checks. 3789 break; 3790 } 3791 } 3792 3793 if (BindsDirectly) { 3794 // C++ [dcl.init.ref]p4: 3795 // [...] In all cases where the reference-related or 3796 // reference-compatible relationship of two types is used to 3797 // establish the validity of a reference binding, and T1 is a 3798 // base class of T2, a program that necessitates such a binding 3799 // is ill-formed if T1 is an inaccessible (clause 11) or 3800 // ambiguous (10.2) base class of T2. 3801 // 3802 // Note that we only check this condition when we're allowed to 3803 // complain about errors, because we should not be checking for 3804 // ambiguity (or inaccessibility) unless the reference binding 3805 // actually happens. 3806 if (DerivedToBase) 3807 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3808 Init->getSourceRange()); 3809 else 3810 return false; 3811 } 3812 3813 // -- Otherwise, the reference shall be to a non-volatile const 3814 // type (i.e., cv1 shall be const), or the reference shall be an 3815 // rvalue reference and the initializer expression shall be an rvalue. 3816 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3817 if (!ICS) 3818 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3819 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3820 << T2 << Init->getSourceRange(); 3821 return true; 3822 } 3823 3824 // -- If the initializer expression is an rvalue, with T2 a 3825 // class type, and "cv1 T1" is reference-compatible with 3826 // "cv2 T2," the reference is bound in one of the 3827 // following ways (the choice is implementation-defined): 3828 // 3829 // -- The reference is bound to the object represented by 3830 // the rvalue (see 3.10) or to a sub-object within that 3831 // object. 3832 // 3833 // -- A temporary of type "cv1 T2" [sic] is created, and 3834 // a constructor is called to copy the entire rvalue 3835 // object into the temporary. The reference is bound to 3836 // the temporary or to a sub-object within the 3837 // temporary. 3838 // 3839 // The constructor that would be used to make the copy 3840 // shall be callable whether or not the copy is actually 3841 // done. 3842 // 3843 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3844 // freedom, so we will always take the first option and never build 3845 // a temporary in this case. FIXME: We will, however, have to check 3846 // for the presence of a copy constructor in C++98/03 mode. 3847 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3848 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3849 if (ICS) { 3850 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3851 ICS->Standard.First = ICK_Identity; 3852 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3853 ICS->Standard.Third = ICK_Identity; 3854 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3855 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3856 ICS->Standard.ReferenceBinding = true; 3857 ICS->Standard.DirectBinding = false; 3858 ICS->Standard.RRefBinding = isRValRef; 3859 ICS->Standard.CopyConstructor = 0; 3860 } else { 3861 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3862 if (DerivedToBase) 3863 CK = CastExpr::CK_DerivedToBase; 3864 else if(CheckExceptionSpecCompatibility(Init, T1)) 3865 return true; 3866 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 3867 } 3868 return false; 3869 } 3870 3871 // -- Otherwise, a temporary of type "cv1 T1" is created and 3872 // initialized from the initializer expression using the 3873 // rules for a non-reference copy initialization (8.5). The 3874 // reference is then bound to the temporary. If T1 is 3875 // reference-related to T2, cv1 must be the same 3876 // cv-qualification as, or greater cv-qualification than, 3877 // cv2; otherwise, the program is ill-formed. 3878 if (RefRelationship == Ref_Related) { 3879 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3880 // we would be reference-compatible or reference-compatible with 3881 // added qualification. But that wasn't the case, so the reference 3882 // initialization fails. 3883 if (!ICS) 3884 Diag(DeclLoc, diag::err_reference_init_drops_quals) 3885 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3886 << T2 << Init->getSourceRange(); 3887 return true; 3888 } 3889 3890 // If at least one of the types is a class type, the types are not 3891 // related, and we aren't allowed any user conversions, the 3892 // reference binding fails. This case is important for breaking 3893 // recursion, since TryImplicitConversion below will attempt to 3894 // create a temporary through the use of a copy constructor. 3895 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3896 (T1->isRecordType() || T2->isRecordType())) { 3897 if (!ICS) 3898 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 3899 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3900 return true; 3901 } 3902 3903 // Actually try to convert the initializer to T1. 3904 if (ICS) { 3905 // C++ [over.ics.ref]p2: 3906 // 3907 // When a parameter of reference type is not bound directly to 3908 // an argument expression, the conversion sequence is the one 3909 // required to convert the argument expression to the 3910 // underlying type of the reference according to 3911 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3912 // to copy-initializing a temporary of the underlying type with 3913 // the argument expression. Any difference in top-level 3914 // cv-qualification is subsumed by the initialization itself 3915 // and does not constitute a conversion. 3916 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 3917 /*AllowExplicit=*/false, 3918 /*ForceRValue=*/false, 3919 /*InOverloadResolution=*/false); 3920 3921 // Of course, that's still a reference binding. 3922 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3923 ICS->Standard.ReferenceBinding = true; 3924 ICS->Standard.RRefBinding = isRValRef; 3925 } else if (ICS->ConversionKind == 3926 ImplicitConversionSequence::UserDefinedConversion) { 3927 ICS->UserDefined.After.ReferenceBinding = true; 3928 ICS->UserDefined.After.RRefBinding = isRValRef; 3929 } 3930 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3931 } else { 3932 ImplicitConversionSequence Conversions; 3933 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 3934 false, false, 3935 Conversions); 3936 if (badConversion) { 3937 if ((Conversions.ConversionKind == 3938 ImplicitConversionSequence::BadConversion) 3939 && !Conversions.ConversionFunctionSet.empty()) { 3940 Diag(DeclLoc, 3941 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 3942 for (int j = Conversions.ConversionFunctionSet.size()-1; 3943 j >= 0; j--) { 3944 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 3945 Diag(Func->getLocation(), diag::err_ovl_candidate); 3946 } 3947 } 3948 else { 3949 if (isRValRef) 3950 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3951 << Init->getSourceRange(); 3952 else 3953 Diag(DeclLoc, diag::err_invalid_initialization) 3954 << DeclType << Init->getType() << Init->getSourceRange(); 3955 } 3956 } 3957 return badConversion; 3958 } 3959} 3960 3961/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3962/// of this overloaded operator is well-formed. If so, returns false; 3963/// otherwise, emits appropriate diagnostics and returns true. 3964bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3965 assert(FnDecl && FnDecl->isOverloadedOperator() && 3966 "Expected an overloaded operator declaration"); 3967 3968 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3969 3970 // C++ [over.oper]p5: 3971 // The allocation and deallocation functions, operator new, 3972 // operator new[], operator delete and operator delete[], are 3973 // described completely in 3.7.3. The attributes and restrictions 3974 // found in the rest of this subclause do not apply to them unless 3975 // explicitly stated in 3.7.3. 3976 // FIXME: Write a separate routine for checking this. For now, just allow it. 3977 if (Op == OO_New || Op == OO_Array_New || 3978 Op == OO_Delete || Op == OO_Array_Delete) 3979 return false; 3980 3981 // C++ [over.oper]p6: 3982 // An operator function shall either be a non-static member 3983 // function or be a non-member function and have at least one 3984 // parameter whose type is a class, a reference to a class, an 3985 // enumeration, or a reference to an enumeration. 3986 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3987 if (MethodDecl->isStatic()) 3988 return Diag(FnDecl->getLocation(), 3989 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3990 } else { 3991 bool ClassOrEnumParam = false; 3992 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3993 ParamEnd = FnDecl->param_end(); 3994 Param != ParamEnd; ++Param) { 3995 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3996 if (ParamType->isDependentType() || ParamType->isRecordType() || 3997 ParamType->isEnumeralType()) { 3998 ClassOrEnumParam = true; 3999 break; 4000 } 4001 } 4002 4003 if (!ClassOrEnumParam) 4004 return Diag(FnDecl->getLocation(), 4005 diag::err_operator_overload_needs_class_or_enum) 4006 << FnDecl->getDeclName(); 4007 } 4008 4009 // C++ [over.oper]p8: 4010 // An operator function cannot have default arguments (8.3.6), 4011 // except where explicitly stated below. 4012 // 4013 // Only the function-call operator allows default arguments 4014 // (C++ [over.call]p1). 4015 if (Op != OO_Call) { 4016 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4017 Param != FnDecl->param_end(); ++Param) { 4018 if ((*Param)->hasUnparsedDefaultArg()) 4019 return Diag((*Param)->getLocation(), 4020 diag::err_operator_overload_default_arg) 4021 << FnDecl->getDeclName(); 4022 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4023 return Diag((*Param)->getLocation(), 4024 diag::err_operator_overload_default_arg) 4025 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4026 } 4027 } 4028 4029 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4030 { false, false, false } 4031#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4032 , { Unary, Binary, MemberOnly } 4033#include "clang/Basic/OperatorKinds.def" 4034 }; 4035 4036 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4037 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4038 bool MustBeMemberOperator = OperatorUses[Op][2]; 4039 4040 // C++ [over.oper]p8: 4041 // [...] Operator functions cannot have more or fewer parameters 4042 // than the number required for the corresponding operator, as 4043 // described in the rest of this subclause. 4044 unsigned NumParams = FnDecl->getNumParams() 4045 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4046 if (Op != OO_Call && 4047 ((NumParams == 1 && !CanBeUnaryOperator) || 4048 (NumParams == 2 && !CanBeBinaryOperator) || 4049 (NumParams < 1) || (NumParams > 2))) { 4050 // We have the wrong number of parameters. 4051 unsigned ErrorKind; 4052 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4053 ErrorKind = 2; // 2 -> unary or binary. 4054 } else if (CanBeUnaryOperator) { 4055 ErrorKind = 0; // 0 -> unary 4056 } else { 4057 assert(CanBeBinaryOperator && 4058 "All non-call overloaded operators are unary or binary!"); 4059 ErrorKind = 1; // 1 -> binary 4060 } 4061 4062 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4063 << FnDecl->getDeclName() << NumParams << ErrorKind; 4064 } 4065 4066 // Overloaded operators other than operator() cannot be variadic. 4067 if (Op != OO_Call && 4068 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4069 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4070 << FnDecl->getDeclName(); 4071 } 4072 4073 // Some operators must be non-static member functions. 4074 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4075 return Diag(FnDecl->getLocation(), 4076 diag::err_operator_overload_must_be_member) 4077 << FnDecl->getDeclName(); 4078 } 4079 4080 // C++ [over.inc]p1: 4081 // The user-defined function called operator++ implements the 4082 // prefix and postfix ++ operator. If this function is a member 4083 // function with no parameters, or a non-member function with one 4084 // parameter of class or enumeration type, it defines the prefix 4085 // increment operator ++ for objects of that type. If the function 4086 // is a member function with one parameter (which shall be of type 4087 // int) or a non-member function with two parameters (the second 4088 // of which shall be of type int), it defines the postfix 4089 // increment operator ++ for objects of that type. 4090 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4091 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4092 bool ParamIsInt = false; 4093 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4094 ParamIsInt = BT->getKind() == BuiltinType::Int; 4095 4096 if (!ParamIsInt) 4097 return Diag(LastParam->getLocation(), 4098 diag::err_operator_overload_post_incdec_must_be_int) 4099 << LastParam->getType() << (Op == OO_MinusMinus); 4100 } 4101 4102 // Notify the class if it got an assignment operator. 4103 if (Op == OO_Equal) { 4104 // Would have returned earlier otherwise. 4105 assert(isa<CXXMethodDecl>(FnDecl) && 4106 "Overloaded = not member, but not filtered."); 4107 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4108 Method->setCopyAssignment(true); 4109 Method->getParent()->addedAssignmentOperator(Context, Method); 4110 } 4111 4112 return false; 4113} 4114 4115/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4116/// linkage specification, including the language and (if present) 4117/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4118/// the location of the language string literal, which is provided 4119/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4120/// the '{' brace. Otherwise, this linkage specification does not 4121/// have any braces. 4122Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4123 SourceLocation ExternLoc, 4124 SourceLocation LangLoc, 4125 const char *Lang, 4126 unsigned StrSize, 4127 SourceLocation LBraceLoc) { 4128 LinkageSpecDecl::LanguageIDs Language; 4129 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4130 Language = LinkageSpecDecl::lang_c; 4131 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4132 Language = LinkageSpecDecl::lang_cxx; 4133 else { 4134 Diag(LangLoc, diag::err_bad_language); 4135 return DeclPtrTy(); 4136 } 4137 4138 // FIXME: Add all the various semantics of linkage specifications 4139 4140 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4141 LangLoc, Language, 4142 LBraceLoc.isValid()); 4143 CurContext->addDecl(D); 4144 PushDeclContext(S, D); 4145 return DeclPtrTy::make(D); 4146} 4147 4148/// ActOnFinishLinkageSpecification - Completely the definition of 4149/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4150/// valid, it's the position of the closing '}' brace in a linkage 4151/// specification that uses braces. 4152Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4153 DeclPtrTy LinkageSpec, 4154 SourceLocation RBraceLoc) { 4155 if (LinkageSpec) 4156 PopDeclContext(); 4157 return LinkageSpec; 4158} 4159 4160/// \brief Perform semantic analysis for the variable declaration that 4161/// occurs within a C++ catch clause, returning the newly-created 4162/// variable. 4163VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4164 DeclaratorInfo *DInfo, 4165 IdentifierInfo *Name, 4166 SourceLocation Loc, 4167 SourceRange Range) { 4168 bool Invalid = false; 4169 4170 // Arrays and functions decay. 4171 if (ExDeclType->isArrayType()) 4172 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4173 else if (ExDeclType->isFunctionType()) 4174 ExDeclType = Context.getPointerType(ExDeclType); 4175 4176 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4177 // The exception-declaration shall not denote a pointer or reference to an 4178 // incomplete type, other than [cv] void*. 4179 // N2844 forbids rvalue references. 4180 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4181 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4182 Invalid = true; 4183 } 4184 4185 QualType BaseType = ExDeclType; 4186 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4187 unsigned DK = diag::err_catch_incomplete; 4188 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4189 BaseType = Ptr->getPointeeType(); 4190 Mode = 1; 4191 DK = diag::err_catch_incomplete_ptr; 4192 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4193 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4194 BaseType = Ref->getPointeeType(); 4195 Mode = 2; 4196 DK = diag::err_catch_incomplete_ref; 4197 } 4198 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4199 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4200 Invalid = true; 4201 4202 if (!Invalid && !ExDeclType->isDependentType() && 4203 RequireNonAbstractType(Loc, ExDeclType, 4204 diag::err_abstract_type_in_decl, 4205 AbstractVariableType)) 4206 Invalid = true; 4207 4208 // FIXME: Need to test for ability to copy-construct and destroy the 4209 // exception variable. 4210 4211 // FIXME: Need to check for abstract classes. 4212 4213 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4214 Name, ExDeclType, DInfo, VarDecl::None); 4215 4216 if (Invalid) 4217 ExDecl->setInvalidDecl(); 4218 4219 return ExDecl; 4220} 4221 4222/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4223/// handler. 4224Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4225 DeclaratorInfo *DInfo = 0; 4226 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4227 4228 bool Invalid = D.isInvalidType(); 4229 IdentifierInfo *II = D.getIdentifier(); 4230 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4231 // The scope should be freshly made just for us. There is just no way 4232 // it contains any previous declaration. 4233 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4234 if (PrevDecl->isTemplateParameter()) { 4235 // Maybe we will complain about the shadowed template parameter. 4236 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4237 } 4238 } 4239 4240 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4241 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4242 << D.getCXXScopeSpec().getRange(); 4243 Invalid = true; 4244 } 4245 4246 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4247 D.getIdentifier(), 4248 D.getIdentifierLoc(), 4249 D.getDeclSpec().getSourceRange()); 4250 4251 if (Invalid) 4252 ExDecl->setInvalidDecl(); 4253 4254 // Add the exception declaration into this scope. 4255 if (II) 4256 PushOnScopeChains(ExDecl, S); 4257 else 4258 CurContext->addDecl(ExDecl); 4259 4260 ProcessDeclAttributes(S, ExDecl, D); 4261 return DeclPtrTy::make(ExDecl); 4262} 4263 4264Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4265 ExprArg assertexpr, 4266 ExprArg assertmessageexpr) { 4267 Expr *AssertExpr = (Expr *)assertexpr.get(); 4268 StringLiteral *AssertMessage = 4269 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4270 4271 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4272 llvm::APSInt Value(32); 4273 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4274 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4275 AssertExpr->getSourceRange(); 4276 return DeclPtrTy(); 4277 } 4278 4279 if (Value == 0) { 4280 std::string str(AssertMessage->getStrData(), 4281 AssertMessage->getByteLength()); 4282 Diag(AssertLoc, diag::err_static_assert_failed) 4283 << str << AssertExpr->getSourceRange(); 4284 } 4285 } 4286 4287 assertexpr.release(); 4288 assertmessageexpr.release(); 4289 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4290 AssertExpr, AssertMessage); 4291 4292 CurContext->addDecl(Decl); 4293 return DeclPtrTy::make(Decl); 4294} 4295 4296/// Handle a friend type declaration. This works in tandem with 4297/// ActOnTag. 4298/// 4299/// Notes on friend class templates: 4300/// 4301/// We generally treat friend class declarations as if they were 4302/// declaring a class. So, for example, the elaborated type specifier 4303/// in a friend declaration is required to obey the restrictions of a 4304/// class-head (i.e. no typedefs in the scope chain), template 4305/// parameters are required to match up with simple template-ids, &c. 4306/// However, unlike when declaring a template specialization, it's 4307/// okay to refer to a template specialization without an empty 4308/// template parameter declaration, e.g. 4309/// friend class A<T>::B<unsigned>; 4310/// We permit this as a special case; if there are any template 4311/// parameters present at all, require proper matching, i.e. 4312/// template <> template <class T> friend class A<int>::B; 4313Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4314 MultiTemplateParamsArg TempParams) { 4315 SourceLocation Loc = DS.getSourceRange().getBegin(); 4316 4317 assert(DS.isFriendSpecified()); 4318 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4319 4320 // Try to convert the decl specifier to a type. This works for 4321 // friend templates because ActOnTag never produces a ClassTemplateDecl 4322 // for a TUK_Friend. 4323 Declarator TheDeclarator(DS, Declarator::MemberContext); 4324 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4325 if (TheDeclarator.isInvalidType()) 4326 return DeclPtrTy(); 4327 4328 // This is definitely an error in C++98. It's probably meant to 4329 // be forbidden in C++0x, too, but the specification is just 4330 // poorly written. 4331 // 4332 // The problem is with declarations like the following: 4333 // template <T> friend A<T>::foo; 4334 // where deciding whether a class C is a friend or not now hinges 4335 // on whether there exists an instantiation of A that causes 4336 // 'foo' to equal C. There are restrictions on class-heads 4337 // (which we declare (by fiat) elaborated friend declarations to 4338 // be) that makes this tractable. 4339 // 4340 // FIXME: handle "template <> friend class A<T>;", which 4341 // is possibly well-formed? Who even knows? 4342 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4343 Diag(Loc, diag::err_tagless_friend_type_template) 4344 << DS.getSourceRange(); 4345 return DeclPtrTy(); 4346 } 4347 4348 // C++ [class.friend]p2: 4349 // An elaborated-type-specifier shall be used in a friend declaration 4350 // for a class.* 4351 // * The class-key of the elaborated-type-specifier is required. 4352 // This is one of the rare places in Clang where it's legitimate to 4353 // ask about the "spelling" of the type. 4354 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4355 // If we evaluated the type to a record type, suggest putting 4356 // a tag in front. 4357 if (const RecordType *RT = T->getAs<RecordType>()) { 4358 RecordDecl *RD = RT->getDecl(); 4359 4360 std::string InsertionText = std::string(" ") + RD->getKindName(); 4361 4362 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4363 << (unsigned) RD->getTagKind() 4364 << T 4365 << SourceRange(DS.getFriendSpecLoc()) 4366 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4367 InsertionText); 4368 return DeclPtrTy(); 4369 }else { 4370 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4371 << DS.getSourceRange(); 4372 return DeclPtrTy(); 4373 } 4374 } 4375 4376 // Enum types cannot be friends. 4377 if (T->getAs<EnumType>()) { 4378 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4379 << SourceRange(DS.getFriendSpecLoc()); 4380 return DeclPtrTy(); 4381 } 4382 4383 // C++98 [class.friend]p1: A friend of a class is a function 4384 // or class that is not a member of the class . . . 4385 // But that's a silly restriction which nobody implements for 4386 // inner classes, and C++0x removes it anyway, so we only report 4387 // this (as a warning) if we're being pedantic. 4388 if (!getLangOptions().CPlusPlus0x) 4389 if (const RecordType *RT = T->getAs<RecordType>()) 4390 if (RT->getDecl()->getDeclContext() == CurContext) 4391 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4392 4393 Decl *D; 4394 if (TempParams.size()) 4395 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4396 TempParams.size(), 4397 (TemplateParameterList**) TempParams.release(), 4398 T.getTypePtr(), 4399 DS.getFriendSpecLoc()); 4400 else 4401 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4402 DS.getFriendSpecLoc()); 4403 D->setAccess(AS_public); 4404 CurContext->addDecl(D); 4405 4406 return DeclPtrTy::make(D); 4407} 4408 4409Sema::DeclPtrTy 4410Sema::ActOnFriendFunctionDecl(Scope *S, 4411 Declarator &D, 4412 bool IsDefinition, 4413 MultiTemplateParamsArg TemplateParams) { 4414 const DeclSpec &DS = D.getDeclSpec(); 4415 4416 assert(DS.isFriendSpecified()); 4417 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4418 4419 SourceLocation Loc = D.getIdentifierLoc(); 4420 DeclaratorInfo *DInfo = 0; 4421 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4422 4423 // C++ [class.friend]p1 4424 // A friend of a class is a function or class.... 4425 // Note that this sees through typedefs, which is intended. 4426 // It *doesn't* see through dependent types, which is correct 4427 // according to [temp.arg.type]p3: 4428 // If a declaration acquires a function type through a 4429 // type dependent on a template-parameter and this causes 4430 // a declaration that does not use the syntactic form of a 4431 // function declarator to have a function type, the program 4432 // is ill-formed. 4433 if (!T->isFunctionType()) { 4434 Diag(Loc, diag::err_unexpected_friend); 4435 4436 // It might be worthwhile to try to recover by creating an 4437 // appropriate declaration. 4438 return DeclPtrTy(); 4439 } 4440 4441 // C++ [namespace.memdef]p3 4442 // - If a friend declaration in a non-local class first declares a 4443 // class or function, the friend class or function is a member 4444 // of the innermost enclosing namespace. 4445 // - The name of the friend is not found by simple name lookup 4446 // until a matching declaration is provided in that namespace 4447 // scope (either before or after the class declaration granting 4448 // friendship). 4449 // - If a friend function is called, its name may be found by the 4450 // name lookup that considers functions from namespaces and 4451 // classes associated with the types of the function arguments. 4452 // - When looking for a prior declaration of a class or a function 4453 // declared as a friend, scopes outside the innermost enclosing 4454 // namespace scope are not considered. 4455 4456 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4457 DeclarationName Name = GetNameForDeclarator(D); 4458 assert(Name); 4459 4460 // The context we found the declaration in, or in which we should 4461 // create the declaration. 4462 DeclContext *DC; 4463 4464 // FIXME: handle local classes 4465 4466 // Recover from invalid scope qualifiers as if they just weren't there. 4467 NamedDecl *PrevDecl = 0; 4468 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4469 // FIXME: RequireCompleteDeclContext 4470 DC = computeDeclContext(ScopeQual); 4471 4472 // FIXME: handle dependent contexts 4473 if (!DC) return DeclPtrTy(); 4474 4475 LookupResult R; 4476 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4477 PrevDecl = R.getAsSingleDecl(Context); 4478 4479 // If searching in that context implicitly found a declaration in 4480 // a different context, treat it like it wasn't found at all. 4481 // TODO: better diagnostics for this case. Suggesting the right 4482 // qualified scope would be nice... 4483 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4484 D.setInvalidType(); 4485 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4486 return DeclPtrTy(); 4487 } 4488 4489 // C++ [class.friend]p1: A friend of a class is a function or 4490 // class that is not a member of the class . . . 4491 if (DC->Equals(CurContext)) 4492 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4493 4494 // Otherwise walk out to the nearest namespace scope looking for matches. 4495 } else { 4496 // TODO: handle local class contexts. 4497 4498 DC = CurContext; 4499 while (true) { 4500 // Skip class contexts. If someone can cite chapter and verse 4501 // for this behavior, that would be nice --- it's what GCC and 4502 // EDG do, and it seems like a reasonable intent, but the spec 4503 // really only says that checks for unqualified existing 4504 // declarations should stop at the nearest enclosing namespace, 4505 // not that they should only consider the nearest enclosing 4506 // namespace. 4507 while (DC->isRecord()) 4508 DC = DC->getParent(); 4509 4510 LookupResult R; 4511 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4512 PrevDecl = R.getAsSingleDecl(Context); 4513 4514 // TODO: decide what we think about using declarations. 4515 if (PrevDecl) 4516 break; 4517 4518 if (DC->isFileContext()) break; 4519 DC = DC->getParent(); 4520 } 4521 4522 // C++ [class.friend]p1: A friend of a class is a function or 4523 // class that is not a member of the class . . . 4524 // C++0x changes this for both friend types and functions. 4525 // Most C++ 98 compilers do seem to give an error here, so 4526 // we do, too. 4527 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4528 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4529 } 4530 4531 if (DC->isFileContext()) { 4532 // This implies that it has to be an operator or function. 4533 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4534 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4535 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4536 Diag(Loc, diag::err_introducing_special_friend) << 4537 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4538 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4539 return DeclPtrTy(); 4540 } 4541 } 4542 4543 bool Redeclaration = false; 4544 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4545 move(TemplateParams), 4546 IsDefinition, 4547 Redeclaration); 4548 if (!ND) return DeclPtrTy(); 4549 4550 assert(ND->getDeclContext() == DC); 4551 assert(ND->getLexicalDeclContext() == CurContext); 4552 4553 // Add the function declaration to the appropriate lookup tables, 4554 // adjusting the redeclarations list as necessary. We don't 4555 // want to do this yet if the friending class is dependent. 4556 // 4557 // Also update the scope-based lookup if the target context's 4558 // lookup context is in lexical scope. 4559 if (!CurContext->isDependentContext()) { 4560 DC = DC->getLookupContext(); 4561 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4562 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4563 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4564 } 4565 4566 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4567 D.getIdentifierLoc(), ND, 4568 DS.getFriendSpecLoc()); 4569 FrD->setAccess(AS_public); 4570 CurContext->addDecl(FrD); 4571 4572 return DeclPtrTy::make(ND); 4573} 4574 4575void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4576 AdjustDeclIfTemplate(dcl); 4577 4578 Decl *Dcl = dcl.getAs<Decl>(); 4579 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4580 if (!Fn) { 4581 Diag(DelLoc, diag::err_deleted_non_function); 4582 return; 4583 } 4584 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4585 Diag(DelLoc, diag::err_deleted_decl_not_first); 4586 Diag(Prev->getLocation(), diag::note_previous_declaration); 4587 // If the declaration wasn't the first, we delete the function anyway for 4588 // recovery. 4589 } 4590 Fn->setDeleted(); 4591} 4592 4593static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4594 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4595 ++CI) { 4596 Stmt *SubStmt = *CI; 4597 if (!SubStmt) 4598 continue; 4599 if (isa<ReturnStmt>(SubStmt)) 4600 Self.Diag(SubStmt->getSourceRange().getBegin(), 4601 diag::err_return_in_constructor_handler); 4602 if (!isa<Expr>(SubStmt)) 4603 SearchForReturnInStmt(Self, SubStmt); 4604 } 4605} 4606 4607void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4608 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4609 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4610 SearchForReturnInStmt(*this, Handler); 4611 } 4612} 4613 4614bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4615 const CXXMethodDecl *Old) { 4616 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4617 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4618 4619 QualType CNewTy = Context.getCanonicalType(NewTy); 4620 QualType COldTy = Context.getCanonicalType(OldTy); 4621 4622 if (CNewTy == COldTy && 4623 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 4624 return false; 4625 4626 // Check if the return types are covariant 4627 QualType NewClassTy, OldClassTy; 4628 4629 /// Both types must be pointers or references to classes. 4630 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4631 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4632 NewClassTy = NewPT->getPointeeType(); 4633 OldClassTy = OldPT->getPointeeType(); 4634 } 4635 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4636 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4637 NewClassTy = NewRT->getPointeeType(); 4638 OldClassTy = OldRT->getPointeeType(); 4639 } 4640 } 4641 4642 // The return types aren't either both pointers or references to a class type. 4643 if (NewClassTy.isNull()) { 4644 Diag(New->getLocation(), 4645 diag::err_different_return_type_for_overriding_virtual_function) 4646 << New->getDeclName() << NewTy << OldTy; 4647 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4648 4649 return true; 4650 } 4651 4652 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 4653 // Check if the new class derives from the old class. 4654 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4655 Diag(New->getLocation(), 4656 diag::err_covariant_return_not_derived) 4657 << New->getDeclName() << NewTy << OldTy; 4658 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4659 return true; 4660 } 4661 4662 // Check if we the conversion from derived to base is valid. 4663 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4664 diag::err_covariant_return_inaccessible_base, 4665 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4666 // FIXME: Should this point to the return type? 4667 New->getLocation(), SourceRange(), New->getDeclName())) { 4668 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4669 return true; 4670 } 4671 } 4672 4673 // The qualifiers of the return types must be the same. 4674 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 4675 Diag(New->getLocation(), 4676 diag::err_covariant_return_type_different_qualifications) 4677 << New->getDeclName() << NewTy << OldTy; 4678 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4679 return true; 4680 }; 4681 4682 4683 // The new class type must have the same or less qualifiers as the old type. 4684 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4685 Diag(New->getLocation(), 4686 diag::err_covariant_return_type_class_type_more_qualified) 4687 << New->getDeclName() << NewTy << OldTy; 4688 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4689 return true; 4690 }; 4691 4692 return false; 4693} 4694 4695/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4696/// initializer for the declaration 'Dcl'. 4697/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4698/// static data member of class X, names should be looked up in the scope of 4699/// class X. 4700void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4701 AdjustDeclIfTemplate(Dcl); 4702 4703 Decl *D = Dcl.getAs<Decl>(); 4704 // If there is no declaration, there was an error parsing it. 4705 if (D == 0) 4706 return; 4707 4708 // Check whether it is a declaration with a nested name specifier like 4709 // int foo::bar; 4710 if (!D->isOutOfLine()) 4711 return; 4712 4713 // C++ [basic.lookup.unqual]p13 4714 // 4715 // A name used in the definition of a static data member of class X 4716 // (after the qualified-id of the static member) is looked up as if the name 4717 // was used in a member function of X. 4718 4719 // Change current context into the context of the initializing declaration. 4720 EnterDeclaratorContext(S, D->getDeclContext()); 4721} 4722 4723/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4724/// initializer for the declaration 'Dcl'. 4725void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4726 AdjustDeclIfTemplate(Dcl); 4727 4728 Decl *D = Dcl.getAs<Decl>(); 4729 // If there is no declaration, there was an error parsing it. 4730 if (D == 0) 4731 return; 4732 4733 // Check whether it is a declaration with a nested name specifier like 4734 // int foo::bar; 4735 if (!D->isOutOfLine()) 4736 return; 4737 4738 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4739 ExitDeclaratorContext(S); 4740} 4741