SemaDeclCXX.cpp revision f8db4771d4f61f4ecfbe202400e10e36e883191b
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} 973 974/// Checks an initializer expression for use of uninitialized fields, such as 975/// containing the field that is being initialized. Returns true if there is an 976/// uninitialized field was used an updates the SourceLocation parameter; false 977/// otherwise. 978static bool InitExprContainsUninitializedFields(const Stmt* S, 979 const FieldDecl* LhsField, 980 SourceLocation* L) { 981 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 982 if (ME) { 983 const NamedDecl* RhsField = ME->getMemberDecl(); 984 if (RhsField == LhsField) { 985 // Initializing a field with itself. Throw a warning. 986 // But wait; there are exceptions! 987 // Exception #1: The field may not belong to this record. 988 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 989 const Expr* base = ME->getBase(); 990 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 991 // Even though the field matches, it does not belong to this record. 992 return false; 993 } 994 // None of the exceptions triggered; return true to indicate an 995 // uninitialized field was used. 996 *L = ME->getMemberLoc(); 997 return true; 998 } 999 } 1000 bool found = false; 1001 for (Stmt::const_child_iterator it = S->child_begin(); 1002 it != S->child_end() && found == false; 1003 ++it) { 1004 if (isa<CallExpr>(S)) { 1005 // Do not descend into function calls or constructors, as the use 1006 // of an uninitialized field may be valid. One would have to inspect 1007 // the contents of the function/ctor to determine if it is safe or not. 1008 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1009 // may be safe, depending on what the function/ctor does. 1010 continue; 1011 } 1012 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1013 } 1014 return found; 1015} 1016 1017Sema::MemInitResult 1018Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1019 unsigned NumArgs, SourceLocation IdLoc, 1020 SourceLocation RParenLoc) { 1021 // Diagnose value-uses of fields to initialize themselves, e.g. 1022 // foo(foo) 1023 // where foo is not also a parameter to the constructor. 1024 // TODO: implement -Wuninitialized and fold this into that framework. 1025 for (unsigned i = 0; i < NumArgs; ++i) { 1026 SourceLocation L; 1027 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1028 // FIXME: Return true in the case when other fields are used before being 1029 // uninitialized. For example, let this field be the i'th field. When 1030 // initializing the i'th field, throw a warning if any of the >= i'th 1031 // fields are used, as they are not yet initialized. 1032 // Right now we are only handling the case where the i'th field uses 1033 // itself in its initializer. 1034 Diag(L, diag::warn_field_is_uninit); 1035 } 1036 } 1037 1038 bool HasDependentArg = false; 1039 for (unsigned i = 0; i < NumArgs; i++) 1040 HasDependentArg |= Args[i]->isTypeDependent(); 1041 1042 CXXConstructorDecl *C = 0; 1043 QualType FieldType = Member->getType(); 1044 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1045 FieldType = Array->getElementType(); 1046 if (FieldType->isDependentType()) { 1047 // Can't check init for dependent type. 1048 } else if (FieldType->isRecordType()) { 1049 // Member is a record (struct/union/class), so pass the initializer 1050 // arguments down to the record's constructor. 1051 if (!HasDependentArg) { 1052 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1053 1054 C = PerformInitializationByConstructor(FieldType, 1055 MultiExprArg(*this, 1056 (void**)Args, 1057 NumArgs), 1058 IdLoc, 1059 SourceRange(IdLoc, RParenLoc), 1060 Member->getDeclName(), IK_Direct, 1061 ConstructorArgs); 1062 1063 if (C) { 1064 // Take over the constructor arguments as our own. 1065 NumArgs = ConstructorArgs.size(); 1066 Args = (Expr **)ConstructorArgs.take(); 1067 } 1068 } 1069 } else if (NumArgs != 1 && NumArgs != 0) { 1070 // The member type is not a record type (or an array of record 1071 // types), so it can be only be default- or copy-initialized. 1072 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1073 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1074 } else if (!HasDependentArg) { 1075 Expr *NewExp; 1076 if (NumArgs == 0) { 1077 if (FieldType->isReferenceType()) { 1078 Diag(IdLoc, diag::err_null_intialized_reference_member) 1079 << Member->getDeclName(); 1080 return Diag(Member->getLocation(), diag::note_declared_at); 1081 } 1082 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1083 NumArgs = 1; 1084 } 1085 else 1086 NewExp = (Expr*)Args[0]; 1087 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1088 return true; 1089 Args[0] = NewExp; 1090 } 1091 // FIXME: Perform direct initialization of the member. 1092 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1093 NumArgs, C, IdLoc, RParenLoc); 1094} 1095 1096Sema::MemInitResult 1097Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1098 unsigned NumArgs, SourceLocation IdLoc, 1099 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1100 bool HasDependentArg = false; 1101 for (unsigned i = 0; i < NumArgs; i++) 1102 HasDependentArg |= Args[i]->isTypeDependent(); 1103 1104 if (!BaseType->isDependentType()) { 1105 if (!BaseType->isRecordType()) 1106 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1107 << BaseType << SourceRange(IdLoc, RParenLoc); 1108 1109 // C++ [class.base.init]p2: 1110 // [...] Unless the mem-initializer-id names a nonstatic data 1111 // member of the constructor’s class or a direct or virtual base 1112 // of that class, the mem-initializer is ill-formed. A 1113 // mem-initializer-list can initialize a base class using any 1114 // name that denotes that base class type. 1115 1116 // First, check for a direct base class. 1117 const CXXBaseSpecifier *DirectBaseSpec = 0; 1118 for (CXXRecordDecl::base_class_const_iterator Base = 1119 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1120 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 1121 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 1122 // We found a direct base of this type. That's what we're 1123 // initializing. 1124 DirectBaseSpec = &*Base; 1125 break; 1126 } 1127 } 1128 1129 // Check for a virtual base class. 1130 // FIXME: We might be able to short-circuit this if we know in advance that 1131 // there are no virtual bases. 1132 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1133 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1134 // We haven't found a base yet; search the class hierarchy for a 1135 // virtual base class. 1136 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1137 /*DetectVirtual=*/false); 1138 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1139 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1140 Path != Paths.end(); ++Path) { 1141 if (Path->back().Base->isVirtual()) { 1142 VirtualBaseSpec = Path->back().Base; 1143 break; 1144 } 1145 } 1146 } 1147 } 1148 1149 // C++ [base.class.init]p2: 1150 // If a mem-initializer-id is ambiguous because it designates both 1151 // a direct non-virtual base class and an inherited virtual base 1152 // class, the mem-initializer is ill-formed. 1153 if (DirectBaseSpec && VirtualBaseSpec) 1154 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1155 << BaseType << SourceRange(IdLoc, RParenLoc); 1156 // C++ [base.class.init]p2: 1157 // Unless the mem-initializer-id names a nonstatic data membeer of the 1158 // constructor's class ot a direst or virtual base of that class, the 1159 // mem-initializer is ill-formed. 1160 if (!DirectBaseSpec && !VirtualBaseSpec) 1161 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1162 << BaseType << ClassDecl->getNameAsCString() 1163 << SourceRange(IdLoc, RParenLoc); 1164 } 1165 1166 CXXConstructorDecl *C = 0; 1167 if (!BaseType->isDependentType() && !HasDependentArg) { 1168 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1169 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1170 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1171 1172 C = PerformInitializationByConstructor(BaseType, 1173 MultiExprArg(*this, 1174 (void**)Args, NumArgs), 1175 IdLoc, SourceRange(IdLoc, RParenLoc), 1176 Name, IK_Direct, 1177 ConstructorArgs); 1178 if (C) { 1179 // Take over the constructor arguments as our own. 1180 NumArgs = ConstructorArgs.size(); 1181 Args = (Expr **)ConstructorArgs.take(); 1182 } 1183 } 1184 1185 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1186 NumArgs, C, IdLoc, RParenLoc); 1187} 1188 1189void 1190Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1191 CXXBaseOrMemberInitializer **Initializers, 1192 unsigned NumInitializers, 1193 bool IsImplicitConstructor) { 1194 // We need to build the initializer AST according to order of construction 1195 // and not what user specified in the Initializers list. 1196 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1197 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1198 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1199 bool HasDependentBaseInit = false; 1200 1201 for (unsigned i = 0; i < NumInitializers; i++) { 1202 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1203 if (Member->isBaseInitializer()) { 1204 if (Member->getBaseClass()->isDependentType()) 1205 HasDependentBaseInit = true; 1206 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1207 } else { 1208 AllBaseFields[Member->getMember()] = Member; 1209 } 1210 } 1211 1212 if (HasDependentBaseInit) { 1213 // FIXME. This does not preserve the ordering of the initializers. 1214 // Try (with -Wreorder) 1215 // template<class X> struct A {}; 1216 // template<class X> struct B : A<X> { 1217 // B() : x1(10), A<X>() {} 1218 // int x1; 1219 // }; 1220 // B<int> x; 1221 // On seeing one dependent type, we should essentially exit this routine 1222 // while preserving user-declared initializer list. When this routine is 1223 // called during instantiatiation process, this routine will rebuild the 1224 // ordered initializer list correctly. 1225 1226 // If we have a dependent base initialization, we can't determine the 1227 // association between initializers and bases; just dump the known 1228 // initializers into the list, and don't try to deal with other bases. 1229 for (unsigned i = 0; i < NumInitializers; i++) { 1230 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1231 if (Member->isBaseInitializer()) 1232 AllToInit.push_back(Member); 1233 } 1234 } else { 1235 // Push virtual bases before others. 1236 for (CXXRecordDecl::base_class_iterator VBase = 1237 ClassDecl->vbases_begin(), 1238 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1239 if (VBase->getType()->isDependentType()) 1240 continue; 1241 if (CXXBaseOrMemberInitializer *Value = 1242 AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1243 CXXRecordDecl *BaseDecl = 1244 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1245 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1246 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context)) 1247 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1248 AllToInit.push_back(Value); 1249 } 1250 else { 1251 CXXRecordDecl *VBaseDecl = 1252 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1253 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1254 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1255 if (!Ctor) { 1256 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1257 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1258 << 0 << VBase->getType(); 1259 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1260 << Context.getTagDeclType(VBaseDecl); 1261 continue; 1262 } 1263 1264 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1265 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1266 Constructor->getLocation(), CtorArgs)) 1267 continue; 1268 1269 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1270 1271 CXXBaseOrMemberInitializer *Member = 1272 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1273 CtorArgs.takeAs<Expr>(), 1274 CtorArgs.size(), Ctor, 1275 SourceLocation(), 1276 SourceLocation()); 1277 AllToInit.push_back(Member); 1278 } 1279 } 1280 1281 for (CXXRecordDecl::base_class_iterator Base = 1282 ClassDecl->bases_begin(), 1283 E = ClassDecl->bases_end(); Base != E; ++Base) { 1284 // Virtuals are in the virtual base list and already constructed. 1285 if (Base->isVirtual()) 1286 continue; 1287 // Skip dependent types. 1288 if (Base->getType()->isDependentType()) 1289 continue; 1290 if (CXXBaseOrMemberInitializer *Value = 1291 AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1292 CXXRecordDecl *BaseDecl = 1293 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1294 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1295 if (CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context)) 1296 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1297 AllToInit.push_back(Value); 1298 } 1299 else { 1300 CXXRecordDecl *BaseDecl = 1301 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1302 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1303 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1304 if (!Ctor) { 1305 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1306 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1307 << 0 << Base->getType(); 1308 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1309 << Context.getTagDeclType(BaseDecl); 1310 continue; 1311 } 1312 1313 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1314 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1315 Constructor->getLocation(), CtorArgs)) 1316 continue; 1317 1318 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1319 1320 CXXBaseOrMemberInitializer *Member = 1321 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1322 CtorArgs.takeAs<Expr>(), 1323 CtorArgs.size(), Ctor, 1324 SourceLocation(), 1325 SourceLocation()); 1326 AllToInit.push_back(Member); 1327 } 1328 } 1329 } 1330 1331 // non-static data members. 1332 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1333 E = ClassDecl->field_end(); Field != E; ++Field) { 1334 if ((*Field)->isAnonymousStructOrUnion()) { 1335 if (const RecordType *FieldClassType = 1336 Field->getType()->getAs<RecordType>()) { 1337 CXXRecordDecl *FieldClassDecl 1338 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1339 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1340 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1341 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1342 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1343 // set to the anonymous union data member used in the initializer 1344 // list. 1345 Value->setMember(*Field); 1346 Value->setAnonUnionMember(*FA); 1347 AllToInit.push_back(Value); 1348 break; 1349 } 1350 } 1351 } 1352 continue; 1353 } 1354 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1355 QualType FT = (*Field)->getType(); 1356 if (const RecordType* RT = FT->getAs<RecordType>()) { 1357 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RT->getDecl()); 1358 assert(FieldRecDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1359 if (CXXConstructorDecl *Ctor = 1360 FieldRecDecl->getDefaultConstructor(Context)) 1361 MarkDeclarationReferenced(Value->getSourceLocation(), Ctor); 1362 } 1363 AllToInit.push_back(Value); 1364 continue; 1365 } 1366 1367 if ((*Field)->getType()->isDependentType()) 1368 continue; 1369 1370 QualType FT = Context.getBaseElementType((*Field)->getType()); 1371 if (const RecordType* RT = FT->getAs<RecordType>()) { 1372 CXXConstructorDecl *Ctor = 1373 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1374 if (!Ctor) { 1375 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1376 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1377 << 1 << (*Field)->getDeclName(); 1378 Diag(Field->getLocation(), diag::note_field_decl); 1379 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1380 << Context.getTagDeclType(RT->getDecl()); 1381 continue; 1382 } 1383 1384 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1385 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1386 Constructor->getLocation(), CtorArgs)) 1387 continue; 1388 1389 CXXBaseOrMemberInitializer *Member = 1390 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1391 CtorArgs.size(), Ctor, 1392 SourceLocation(), 1393 SourceLocation()); 1394 1395 AllToInit.push_back(Member); 1396 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1397 if (FT.isConstQualified() && Ctor->isTrivial()) { 1398 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1399 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1400 << 1 << (*Field)->getDeclName(); 1401 Diag((*Field)->getLocation(), diag::note_declared_at); 1402 } 1403 } 1404 else if (FT->isReferenceType()) { 1405 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1406 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1407 << 0 << (*Field)->getDeclName(); 1408 Diag((*Field)->getLocation(), diag::note_declared_at); 1409 } 1410 else if (FT.isConstQualified()) { 1411 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1412 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1413 << 1 << (*Field)->getDeclName(); 1414 Diag((*Field)->getLocation(), diag::note_declared_at); 1415 } 1416 } 1417 1418 NumInitializers = AllToInit.size(); 1419 if (NumInitializers > 0) { 1420 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1421 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1422 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1423 1424 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1425 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1426 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1427 } 1428} 1429 1430static void *GetKeyForTopLevelField(FieldDecl *Field) { 1431 // For anonymous unions, use the class declaration as the key. 1432 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1433 if (RT->getDecl()->isAnonymousStructOrUnion()) 1434 return static_cast<void *>(RT->getDecl()); 1435 } 1436 return static_cast<void *>(Field); 1437} 1438 1439static void *GetKeyForBase(QualType BaseType) { 1440 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1441 return (void *)RT; 1442 1443 assert(0 && "Unexpected base type!"); 1444 return 0; 1445} 1446 1447static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1448 bool MemberMaybeAnon = false) { 1449 // For fields injected into the class via declaration of an anonymous union, 1450 // use its anonymous union class declaration as the unique key. 1451 if (Member->isMemberInitializer()) { 1452 FieldDecl *Field = Member->getMember(); 1453 1454 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1455 // data member of the class. Data member used in the initializer list is 1456 // in AnonUnionMember field. 1457 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1458 Field = Member->getAnonUnionMember(); 1459 if (Field->getDeclContext()->isRecord()) { 1460 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1461 if (RD->isAnonymousStructOrUnion()) 1462 return static_cast<void *>(RD); 1463 } 1464 return static_cast<void *>(Field); 1465 } 1466 1467 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1468} 1469 1470/// ActOnMemInitializers - Handle the member initializers for a constructor. 1471void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1472 SourceLocation ColonLoc, 1473 MemInitTy **MemInits, unsigned NumMemInits) { 1474 if (!ConstructorDecl) 1475 return; 1476 1477 AdjustDeclIfTemplate(ConstructorDecl); 1478 1479 CXXConstructorDecl *Constructor 1480 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1481 1482 if (!Constructor) { 1483 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1484 return; 1485 } 1486 1487 if (!Constructor->isDependentContext()) { 1488 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1489 bool err = false; 1490 for (unsigned i = 0; i < NumMemInits; i++) { 1491 CXXBaseOrMemberInitializer *Member = 1492 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1493 void *KeyToMember = GetKeyForMember(Member); 1494 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1495 if (!PrevMember) { 1496 PrevMember = Member; 1497 continue; 1498 } 1499 if (FieldDecl *Field = Member->getMember()) 1500 Diag(Member->getSourceLocation(), 1501 diag::error_multiple_mem_initialization) 1502 << Field->getNameAsString(); 1503 else { 1504 Type *BaseClass = Member->getBaseClass(); 1505 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1506 Diag(Member->getSourceLocation(), 1507 diag::error_multiple_base_initialization) 1508 << QualType(BaseClass, 0); 1509 } 1510 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1511 << 0; 1512 err = true; 1513 } 1514 1515 if (err) 1516 return; 1517 } 1518 1519 SetBaseOrMemberInitializers(Constructor, 1520 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1521 NumMemInits, false); 1522 1523 if (Constructor->isDependentContext()) 1524 return; 1525 1526 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1527 Diagnostic::Ignored && 1528 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1529 Diagnostic::Ignored) 1530 return; 1531 1532 // Also issue warning if order of ctor-initializer list does not match order 1533 // of 1) base class declarations and 2) order of non-static data members. 1534 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1535 1536 CXXRecordDecl *ClassDecl 1537 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1538 // Push virtual bases before others. 1539 for (CXXRecordDecl::base_class_iterator VBase = 1540 ClassDecl->vbases_begin(), 1541 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1542 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1543 1544 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1545 E = ClassDecl->bases_end(); Base != E; ++Base) { 1546 // Virtuals are alread in the virtual base list and are constructed 1547 // first. 1548 if (Base->isVirtual()) 1549 continue; 1550 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1551 } 1552 1553 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1554 E = ClassDecl->field_end(); Field != E; ++Field) 1555 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1556 1557 int Last = AllBaseOrMembers.size(); 1558 int curIndex = 0; 1559 CXXBaseOrMemberInitializer *PrevMember = 0; 1560 for (unsigned i = 0; i < NumMemInits; i++) { 1561 CXXBaseOrMemberInitializer *Member = 1562 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1563 void *MemberInCtorList = GetKeyForMember(Member, true); 1564 1565 for (; curIndex < Last; curIndex++) 1566 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1567 break; 1568 if (curIndex == Last) { 1569 assert(PrevMember && "Member not in member list?!"); 1570 // Initializer as specified in ctor-initializer list is out of order. 1571 // Issue a warning diagnostic. 1572 if (PrevMember->isBaseInitializer()) { 1573 // Diagnostics is for an initialized base class. 1574 Type *BaseClass = PrevMember->getBaseClass(); 1575 Diag(PrevMember->getSourceLocation(), 1576 diag::warn_base_initialized) 1577 << QualType(BaseClass, 0); 1578 } else { 1579 FieldDecl *Field = PrevMember->getMember(); 1580 Diag(PrevMember->getSourceLocation(), 1581 diag::warn_field_initialized) 1582 << Field->getNameAsString(); 1583 } 1584 // Also the note! 1585 if (FieldDecl *Field = Member->getMember()) 1586 Diag(Member->getSourceLocation(), 1587 diag::note_fieldorbase_initialized_here) << 0 1588 << Field->getNameAsString(); 1589 else { 1590 Type *BaseClass = Member->getBaseClass(); 1591 Diag(Member->getSourceLocation(), 1592 diag::note_fieldorbase_initialized_here) << 1 1593 << QualType(BaseClass, 0); 1594 } 1595 for (curIndex = 0; curIndex < Last; curIndex++) 1596 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1597 break; 1598 } 1599 PrevMember = Member; 1600 } 1601} 1602 1603void 1604Sema::computeBaseOrMembersToDestroy(CXXDestructorDecl *Destructor) { 1605 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1606 llvm::SmallVector<uintptr_t, 32> AllToDestruct; 1607 1608 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1609 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1610 if (VBase->getType()->isDependentType()) 1611 continue; 1612 // Skip over virtual bases which have trivial destructors. 1613 CXXRecordDecl *BaseClassDecl 1614 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1615 if (BaseClassDecl->hasTrivialDestructor()) 1616 continue; 1617 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1618 MarkDeclarationReferenced(Destructor->getLocation(), 1619 const_cast<CXXDestructorDecl*>(Dtor)); 1620 1621 uintptr_t Member = 1622 reinterpret_cast<uintptr_t>(VBase->getType().getTypePtr()) 1623 | CXXDestructorDecl::VBASE; 1624 AllToDestruct.push_back(Member); 1625 } 1626 for (CXXRecordDecl::base_class_iterator Base = 1627 ClassDecl->bases_begin(), 1628 E = ClassDecl->bases_end(); Base != E; ++Base) { 1629 if (Base->isVirtual()) 1630 continue; 1631 if (Base->getType()->isDependentType()) 1632 continue; 1633 // Skip over virtual bases which have trivial destructors. 1634 CXXRecordDecl *BaseClassDecl 1635 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1636 if (BaseClassDecl->hasTrivialDestructor()) 1637 continue; 1638 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1639 MarkDeclarationReferenced(Destructor->getLocation(), 1640 const_cast<CXXDestructorDecl*>(Dtor)); 1641 uintptr_t Member = 1642 reinterpret_cast<uintptr_t>(Base->getType().getTypePtr()) 1643 | CXXDestructorDecl::DRCTNONVBASE; 1644 AllToDestruct.push_back(Member); 1645 } 1646 1647 // non-static data members. 1648 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1649 E = ClassDecl->field_end(); Field != E; ++Field) { 1650 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 1651 1652 if (const RecordType* RT = FieldType->getAs<RecordType>()) { 1653 // Skip over virtual bases which have trivial destructors. 1654 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1655 if (FieldClassDecl->hasTrivialDestructor()) 1656 continue; 1657 if (const CXXDestructorDecl *Dtor = 1658 FieldClassDecl->getDestructor(Context)) 1659 MarkDeclarationReferenced(Destructor->getLocation(), 1660 const_cast<CXXDestructorDecl*>(Dtor)); 1661 uintptr_t Member = reinterpret_cast<uintptr_t>(*Field); 1662 AllToDestruct.push_back(Member); 1663 } 1664 } 1665 1666 unsigned NumDestructions = AllToDestruct.size(); 1667 if (NumDestructions > 0) { 1668 Destructor->setNumBaseOrMemberDestructions(NumDestructions); 1669 uintptr_t *BaseOrMemberDestructions = 1670 new (Context) uintptr_t [NumDestructions]; 1671 // Insert in reverse order. 1672 for (int Idx = NumDestructions-1, i=0 ; Idx >= 0; --Idx) 1673 BaseOrMemberDestructions[i++] = AllToDestruct[Idx]; 1674 Destructor->setBaseOrMemberDestructions(BaseOrMemberDestructions); 1675 } 1676} 1677 1678void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1679 if (!CDtorDecl) 1680 return; 1681 1682 AdjustDeclIfTemplate(CDtorDecl); 1683 1684 if (CXXConstructorDecl *Constructor 1685 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1686 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1687} 1688 1689namespace { 1690 /// PureVirtualMethodCollector - traverses a class and its superclasses 1691 /// and determines if it has any pure virtual methods. 1692 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1693 ASTContext &Context; 1694 1695 public: 1696 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1697 1698 private: 1699 MethodList Methods; 1700 1701 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1702 1703 public: 1704 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1705 : Context(Ctx) { 1706 1707 MethodList List; 1708 Collect(RD, List); 1709 1710 // Copy the temporary list to methods, and make sure to ignore any 1711 // null entries. 1712 for (size_t i = 0, e = List.size(); i != e; ++i) { 1713 if (List[i]) 1714 Methods.push_back(List[i]); 1715 } 1716 } 1717 1718 bool empty() const { return Methods.empty(); } 1719 1720 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1721 MethodList::const_iterator methods_end() { return Methods.end(); } 1722 }; 1723 1724 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1725 MethodList& Methods) { 1726 // First, collect the pure virtual methods for the base classes. 1727 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1728 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1729 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1730 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1731 if (BaseDecl && BaseDecl->isAbstract()) 1732 Collect(BaseDecl, Methods); 1733 } 1734 } 1735 1736 // Next, zero out any pure virtual methods that this class overrides. 1737 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1738 1739 MethodSetTy OverriddenMethods; 1740 size_t MethodsSize = Methods.size(); 1741 1742 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1743 i != e; ++i) { 1744 // Traverse the record, looking for methods. 1745 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1746 // If the method is pure virtual, add it to the methods vector. 1747 if (MD->isPure()) 1748 Methods.push_back(MD); 1749 1750 // Record all the overridden methods in our set. 1751 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1752 E = MD->end_overridden_methods(); I != E; ++I) { 1753 // Keep track of the overridden methods. 1754 OverriddenMethods.insert(*I); 1755 } 1756 } 1757 } 1758 1759 // Now go through the methods and zero out all the ones we know are 1760 // overridden. 1761 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1762 if (OverriddenMethods.count(Methods[i])) 1763 Methods[i] = 0; 1764 } 1765 1766 } 1767} 1768 1769 1770bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1771 unsigned DiagID, AbstractDiagSelID SelID, 1772 const CXXRecordDecl *CurrentRD) { 1773 if (SelID == -1) 1774 return RequireNonAbstractType(Loc, T, 1775 PDiag(DiagID), CurrentRD); 1776 else 1777 return RequireNonAbstractType(Loc, T, 1778 PDiag(DiagID) << SelID, CurrentRD); 1779} 1780 1781bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1782 const PartialDiagnostic &PD, 1783 const CXXRecordDecl *CurrentRD) { 1784 if (!getLangOptions().CPlusPlus) 1785 return false; 1786 1787 if (const ArrayType *AT = Context.getAsArrayType(T)) 1788 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1789 CurrentRD); 1790 1791 if (const PointerType *PT = T->getAs<PointerType>()) { 1792 // Find the innermost pointer type. 1793 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1794 PT = T; 1795 1796 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1797 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1798 } 1799 1800 const RecordType *RT = T->getAs<RecordType>(); 1801 if (!RT) 1802 return false; 1803 1804 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1805 if (!RD) 1806 return false; 1807 1808 if (CurrentRD && CurrentRD != RD) 1809 return false; 1810 1811 if (!RD->isAbstract()) 1812 return false; 1813 1814 Diag(Loc, PD) << RD->getDeclName(); 1815 1816 // Check if we've already emitted the list of pure virtual functions for this 1817 // class. 1818 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1819 return true; 1820 1821 PureVirtualMethodCollector Collector(Context, RD); 1822 1823 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1824 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1825 const CXXMethodDecl *MD = *I; 1826 1827 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1828 MD->getDeclName(); 1829 } 1830 1831 if (!PureVirtualClassDiagSet) 1832 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1833 PureVirtualClassDiagSet->insert(RD); 1834 1835 return true; 1836} 1837 1838namespace { 1839 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1840 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1841 Sema &SemaRef; 1842 CXXRecordDecl *AbstractClass; 1843 1844 bool VisitDeclContext(const DeclContext *DC) { 1845 bool Invalid = false; 1846 1847 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1848 E = DC->decls_end(); I != E; ++I) 1849 Invalid |= Visit(*I); 1850 1851 return Invalid; 1852 } 1853 1854 public: 1855 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1856 : SemaRef(SemaRef), AbstractClass(ac) { 1857 Visit(SemaRef.Context.getTranslationUnitDecl()); 1858 } 1859 1860 bool VisitFunctionDecl(const FunctionDecl *FD) { 1861 if (FD->isThisDeclarationADefinition()) { 1862 // No need to do the check if we're in a definition, because it requires 1863 // that the return/param types are complete. 1864 // because that requires 1865 return VisitDeclContext(FD); 1866 } 1867 1868 // Check the return type. 1869 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1870 bool Invalid = 1871 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1872 diag::err_abstract_type_in_decl, 1873 Sema::AbstractReturnType, 1874 AbstractClass); 1875 1876 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1877 E = FD->param_end(); I != E; ++I) { 1878 const ParmVarDecl *VD = *I; 1879 Invalid |= 1880 SemaRef.RequireNonAbstractType(VD->getLocation(), 1881 VD->getOriginalType(), 1882 diag::err_abstract_type_in_decl, 1883 Sema::AbstractParamType, 1884 AbstractClass); 1885 } 1886 1887 return Invalid; 1888 } 1889 1890 bool VisitDecl(const Decl* D) { 1891 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1892 return VisitDeclContext(DC); 1893 1894 return false; 1895 } 1896 }; 1897} 1898 1899void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1900 DeclPtrTy TagDecl, 1901 SourceLocation LBrac, 1902 SourceLocation RBrac) { 1903 if (!TagDecl) 1904 return; 1905 1906 AdjustDeclIfTemplate(TagDecl); 1907 ActOnFields(S, RLoc, TagDecl, 1908 (DeclPtrTy*)FieldCollector->getCurFields(), 1909 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1910 1911 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1912 if (!RD->isAbstract()) { 1913 // Collect all the pure virtual methods and see if this is an abstract 1914 // class after all. 1915 PureVirtualMethodCollector Collector(Context, RD); 1916 if (!Collector.empty()) 1917 RD->setAbstract(true); 1918 } 1919 1920 if (RD->isAbstract()) 1921 AbstractClassUsageDiagnoser(*this, RD); 1922 1923 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1924 AddImplicitlyDeclaredMembersToClass(RD); 1925} 1926 1927/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1928/// special functions, such as the default constructor, copy 1929/// constructor, or destructor, to the given C++ class (C++ 1930/// [special]p1). This routine can only be executed just before the 1931/// definition of the class is complete. 1932void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1933 CanQualType ClassType 1934 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1935 1936 // FIXME: Implicit declarations have exception specifications, which are 1937 // the union of the specifications of the implicitly called functions. 1938 1939 if (!ClassDecl->hasUserDeclaredConstructor()) { 1940 // C++ [class.ctor]p5: 1941 // A default constructor for a class X is a constructor of class X 1942 // that can be called without an argument. If there is no 1943 // user-declared constructor for class X, a default constructor is 1944 // implicitly declared. An implicitly-declared default constructor 1945 // is an inline public member of its class. 1946 DeclarationName Name 1947 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1948 CXXConstructorDecl *DefaultCon = 1949 CXXConstructorDecl::Create(Context, ClassDecl, 1950 ClassDecl->getLocation(), Name, 1951 Context.getFunctionType(Context.VoidTy, 1952 0, 0, false, 0), 1953 /*DInfo=*/0, 1954 /*isExplicit=*/false, 1955 /*isInline=*/true, 1956 /*isImplicitlyDeclared=*/true); 1957 DefaultCon->setAccess(AS_public); 1958 DefaultCon->setImplicit(); 1959 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1960 ClassDecl->addDecl(DefaultCon); 1961 } 1962 1963 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1964 // C++ [class.copy]p4: 1965 // If the class definition does not explicitly declare a copy 1966 // constructor, one is declared implicitly. 1967 1968 // C++ [class.copy]p5: 1969 // The implicitly-declared copy constructor for a class X will 1970 // have the form 1971 // 1972 // X::X(const X&) 1973 // 1974 // if 1975 bool HasConstCopyConstructor = true; 1976 1977 // -- each direct or virtual base class B of X has a copy 1978 // constructor whose first parameter is of type const B& or 1979 // const volatile B&, and 1980 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1981 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1982 const CXXRecordDecl *BaseClassDecl 1983 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1984 HasConstCopyConstructor 1985 = BaseClassDecl->hasConstCopyConstructor(Context); 1986 } 1987 1988 // -- for all the nonstatic data members of X that are of a 1989 // class type M (or array thereof), each such class type 1990 // has a copy constructor whose first parameter is of type 1991 // const M& or const volatile M&. 1992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1993 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1994 ++Field) { 1995 QualType FieldType = (*Field)->getType(); 1996 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1997 FieldType = Array->getElementType(); 1998 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1999 const CXXRecordDecl *FieldClassDecl 2000 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2001 HasConstCopyConstructor 2002 = FieldClassDecl->hasConstCopyConstructor(Context); 2003 } 2004 } 2005 2006 // Otherwise, the implicitly declared copy constructor will have 2007 // the form 2008 // 2009 // X::X(X&) 2010 QualType ArgType = ClassType; 2011 if (HasConstCopyConstructor) 2012 ArgType = ArgType.withConst(); 2013 ArgType = Context.getLValueReferenceType(ArgType); 2014 2015 // An implicitly-declared copy constructor is an inline public 2016 // member of its class. 2017 DeclarationName Name 2018 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2019 CXXConstructorDecl *CopyConstructor 2020 = CXXConstructorDecl::Create(Context, ClassDecl, 2021 ClassDecl->getLocation(), Name, 2022 Context.getFunctionType(Context.VoidTy, 2023 &ArgType, 1, 2024 false, 0), 2025 /*DInfo=*/0, 2026 /*isExplicit=*/false, 2027 /*isInline=*/true, 2028 /*isImplicitlyDeclared=*/true); 2029 CopyConstructor->setAccess(AS_public); 2030 CopyConstructor->setImplicit(); 2031 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2032 2033 // Add the parameter to the constructor. 2034 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2035 ClassDecl->getLocation(), 2036 /*IdentifierInfo=*/0, 2037 ArgType, /*DInfo=*/0, 2038 VarDecl::None, 0); 2039 CopyConstructor->setParams(Context, &FromParam, 1); 2040 ClassDecl->addDecl(CopyConstructor); 2041 } 2042 2043 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2044 // Note: The following rules are largely analoguous to the copy 2045 // constructor rules. Note that virtual bases are not taken into account 2046 // for determining the argument type of the operator. Note also that 2047 // operators taking an object instead of a reference are allowed. 2048 // 2049 // C++ [class.copy]p10: 2050 // If the class definition does not explicitly declare a copy 2051 // assignment operator, one is declared implicitly. 2052 // The implicitly-defined copy assignment operator for a class X 2053 // will have the form 2054 // 2055 // X& X::operator=(const X&) 2056 // 2057 // if 2058 bool HasConstCopyAssignment = true; 2059 2060 // -- each direct base class B of X has a copy assignment operator 2061 // whose parameter is of type const B&, const volatile B& or B, 2062 // and 2063 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2064 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2065 assert(!Base->getType()->isDependentType() && 2066 "Cannot generate implicit members for class with dependent bases."); 2067 const CXXRecordDecl *BaseClassDecl 2068 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2069 const CXXMethodDecl *MD = 0; 2070 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2071 MD); 2072 } 2073 2074 // -- for all the nonstatic data members of X that are of a class 2075 // type M (or array thereof), each such class type has a copy 2076 // assignment operator whose parameter is of type const M&, 2077 // const volatile M& or M. 2078 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2079 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2080 ++Field) { 2081 QualType FieldType = (*Field)->getType(); 2082 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2083 FieldType = Array->getElementType(); 2084 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2085 const CXXRecordDecl *FieldClassDecl 2086 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2087 const CXXMethodDecl *MD = 0; 2088 HasConstCopyAssignment 2089 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2090 } 2091 } 2092 2093 // Otherwise, the implicitly declared copy assignment operator will 2094 // have the form 2095 // 2096 // X& X::operator=(X&) 2097 QualType ArgType = ClassType; 2098 QualType RetType = Context.getLValueReferenceType(ArgType); 2099 if (HasConstCopyAssignment) 2100 ArgType = ArgType.withConst(); 2101 ArgType = Context.getLValueReferenceType(ArgType); 2102 2103 // An implicitly-declared copy assignment operator is an inline public 2104 // member of its class. 2105 DeclarationName Name = 2106 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2107 CXXMethodDecl *CopyAssignment = 2108 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2109 Context.getFunctionType(RetType, &ArgType, 1, 2110 false, 0), 2111 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2112 CopyAssignment->setAccess(AS_public); 2113 CopyAssignment->setImplicit(); 2114 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2115 CopyAssignment->setCopyAssignment(true); 2116 2117 // Add the parameter to the operator. 2118 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2119 ClassDecl->getLocation(), 2120 /*IdentifierInfo=*/0, 2121 ArgType, /*DInfo=*/0, 2122 VarDecl::None, 0); 2123 CopyAssignment->setParams(Context, &FromParam, 1); 2124 2125 // Don't call addedAssignmentOperator. There is no way to distinguish an 2126 // implicit from an explicit assignment operator. 2127 ClassDecl->addDecl(CopyAssignment); 2128 } 2129 2130 if (!ClassDecl->hasUserDeclaredDestructor()) { 2131 // C++ [class.dtor]p2: 2132 // If a class has no user-declared destructor, a destructor is 2133 // declared implicitly. An implicitly-declared destructor is an 2134 // inline public member of its class. 2135 DeclarationName Name 2136 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2137 CXXDestructorDecl *Destructor 2138 = CXXDestructorDecl::Create(Context, ClassDecl, 2139 ClassDecl->getLocation(), Name, 2140 Context.getFunctionType(Context.VoidTy, 2141 0, 0, false, 0), 2142 /*isInline=*/true, 2143 /*isImplicitlyDeclared=*/true); 2144 Destructor->setAccess(AS_public); 2145 Destructor->setImplicit(); 2146 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2147 ClassDecl->addDecl(Destructor); 2148 } 2149} 2150 2151void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2152 Decl *D = TemplateD.getAs<Decl>(); 2153 if (!D) 2154 return; 2155 2156 TemplateParameterList *Params = 0; 2157 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2158 Params = Template->getTemplateParameters(); 2159 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2160 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2161 Params = PartialSpec->getTemplateParameters(); 2162 else 2163 return; 2164 2165 for (TemplateParameterList::iterator Param = Params->begin(), 2166 ParamEnd = Params->end(); 2167 Param != ParamEnd; ++Param) { 2168 NamedDecl *Named = cast<NamedDecl>(*Param); 2169 if (Named->getDeclName()) { 2170 S->AddDecl(DeclPtrTy::make(Named)); 2171 IdResolver.AddDecl(Named); 2172 } 2173 } 2174} 2175 2176/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2177/// parsing a top-level (non-nested) C++ class, and we are now 2178/// parsing those parts of the given Method declaration that could 2179/// not be parsed earlier (C++ [class.mem]p2), such as default 2180/// arguments. This action should enter the scope of the given 2181/// Method declaration as if we had just parsed the qualified method 2182/// name. However, it should not bring the parameters into scope; 2183/// that will be performed by ActOnDelayedCXXMethodParameter. 2184void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2185 if (!MethodD) 2186 return; 2187 2188 AdjustDeclIfTemplate(MethodD); 2189 2190 CXXScopeSpec SS; 2191 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2192 QualType ClassTy 2193 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2194 SS.setScopeRep( 2195 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2196 ActOnCXXEnterDeclaratorScope(S, SS); 2197} 2198 2199/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2200/// C++ method declaration. We're (re-)introducing the given 2201/// function parameter into scope for use in parsing later parts of 2202/// the method declaration. For example, we could see an 2203/// ActOnParamDefaultArgument event for this parameter. 2204void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2205 if (!ParamD) 2206 return; 2207 2208 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2209 2210 // If this parameter has an unparsed default argument, clear it out 2211 // to make way for the parsed default argument. 2212 if (Param->hasUnparsedDefaultArg()) 2213 Param->setDefaultArg(0); 2214 2215 S->AddDecl(DeclPtrTy::make(Param)); 2216 if (Param->getDeclName()) 2217 IdResolver.AddDecl(Param); 2218} 2219 2220/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2221/// processing the delayed method declaration for Method. The method 2222/// declaration is now considered finished. There may be a separate 2223/// ActOnStartOfFunctionDef action later (not necessarily 2224/// immediately!) for this method, if it was also defined inside the 2225/// class body. 2226void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2227 if (!MethodD) 2228 return; 2229 2230 AdjustDeclIfTemplate(MethodD); 2231 2232 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2233 CXXScopeSpec SS; 2234 QualType ClassTy 2235 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2236 SS.setScopeRep( 2237 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2238 ActOnCXXExitDeclaratorScope(S, SS); 2239 2240 // Now that we have our default arguments, check the constructor 2241 // again. It could produce additional diagnostics or affect whether 2242 // the class has implicitly-declared destructors, among other 2243 // things. 2244 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2245 CheckConstructor(Constructor); 2246 2247 // Check the default arguments, which we may have added. 2248 if (!Method->isInvalidDecl()) 2249 CheckCXXDefaultArguments(Method); 2250} 2251 2252/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2253/// the well-formedness of the constructor declarator @p D with type @p 2254/// R. If there are any errors in the declarator, this routine will 2255/// emit diagnostics and set the invalid bit to true. In any case, the type 2256/// will be updated to reflect a well-formed type for the constructor and 2257/// returned. 2258QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2259 FunctionDecl::StorageClass &SC) { 2260 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2261 2262 // C++ [class.ctor]p3: 2263 // A constructor shall not be virtual (10.3) or static (9.4). A 2264 // constructor can be invoked for a const, volatile or const 2265 // volatile object. A constructor shall not be declared const, 2266 // volatile, or const volatile (9.3.2). 2267 if (isVirtual) { 2268 if (!D.isInvalidType()) 2269 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2270 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2271 << SourceRange(D.getIdentifierLoc()); 2272 D.setInvalidType(); 2273 } 2274 if (SC == FunctionDecl::Static) { 2275 if (!D.isInvalidType()) 2276 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2277 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2278 << SourceRange(D.getIdentifierLoc()); 2279 D.setInvalidType(); 2280 SC = FunctionDecl::None; 2281 } 2282 2283 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2284 if (FTI.TypeQuals != 0) { 2285 if (FTI.TypeQuals & Qualifiers::Const) 2286 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2287 << "const" << SourceRange(D.getIdentifierLoc()); 2288 if (FTI.TypeQuals & Qualifiers::Volatile) 2289 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2290 << "volatile" << SourceRange(D.getIdentifierLoc()); 2291 if (FTI.TypeQuals & Qualifiers::Restrict) 2292 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2293 << "restrict" << SourceRange(D.getIdentifierLoc()); 2294 } 2295 2296 // Rebuild the function type "R" without any type qualifiers (in 2297 // case any of the errors above fired) and with "void" as the 2298 // return type, since constructors don't have return types. We 2299 // *always* have to do this, because GetTypeForDeclarator will 2300 // put in a result type of "int" when none was specified. 2301 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2302 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2303 Proto->getNumArgs(), 2304 Proto->isVariadic(), 0); 2305} 2306 2307/// CheckConstructor - Checks a fully-formed constructor for 2308/// well-formedness, issuing any diagnostics required. Returns true if 2309/// the constructor declarator is invalid. 2310void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2311 CXXRecordDecl *ClassDecl 2312 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2313 if (!ClassDecl) 2314 return Constructor->setInvalidDecl(); 2315 2316 // C++ [class.copy]p3: 2317 // A declaration of a constructor for a class X is ill-formed if 2318 // its first parameter is of type (optionally cv-qualified) X and 2319 // either there are no other parameters or else all other 2320 // parameters have default arguments. 2321 if (!Constructor->isInvalidDecl() && 2322 ((Constructor->getNumParams() == 1) || 2323 (Constructor->getNumParams() > 1 && 2324 Constructor->getParamDecl(1)->hasDefaultArg()))) { 2325 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2326 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2327 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2328 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2329 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2330 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2331 Constructor->setInvalidDecl(); 2332 } 2333 } 2334 2335 // Notify the class that we've added a constructor. 2336 ClassDecl->addedConstructor(Context, Constructor); 2337} 2338 2339static inline bool 2340FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2341 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2342 FTI.ArgInfo[0].Param && 2343 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2344} 2345 2346/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2347/// the well-formednes of the destructor declarator @p D with type @p 2348/// R. If there are any errors in the declarator, this routine will 2349/// emit diagnostics and set the declarator to invalid. Even if this happens, 2350/// will be updated to reflect a well-formed type for the destructor and 2351/// returned. 2352QualType Sema::CheckDestructorDeclarator(Declarator &D, 2353 FunctionDecl::StorageClass& SC) { 2354 // C++ [class.dtor]p1: 2355 // [...] A typedef-name that names a class is a class-name 2356 // (7.1.3); however, a typedef-name that names a class shall not 2357 // be used as the identifier in the declarator for a destructor 2358 // declaration. 2359 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2360 if (isa<TypedefType>(DeclaratorType)) { 2361 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2362 << DeclaratorType; 2363 D.setInvalidType(); 2364 } 2365 2366 // C++ [class.dtor]p2: 2367 // A destructor is used to destroy objects of its class type. A 2368 // destructor takes no parameters, and no return type can be 2369 // specified for it (not even void). The address of a destructor 2370 // shall not be taken. A destructor shall not be static. A 2371 // destructor can be invoked for a const, volatile or const 2372 // volatile object. A destructor shall not be declared const, 2373 // volatile or const volatile (9.3.2). 2374 if (SC == FunctionDecl::Static) { 2375 if (!D.isInvalidType()) 2376 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2377 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2378 << SourceRange(D.getIdentifierLoc()); 2379 SC = FunctionDecl::None; 2380 D.setInvalidType(); 2381 } 2382 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2383 // Destructors don't have return types, but the parser will 2384 // happily parse something like: 2385 // 2386 // class X { 2387 // float ~X(); 2388 // }; 2389 // 2390 // The return type will be eliminated later. 2391 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2392 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2393 << SourceRange(D.getIdentifierLoc()); 2394 } 2395 2396 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2397 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2398 if (FTI.TypeQuals & Qualifiers::Const) 2399 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2400 << "const" << SourceRange(D.getIdentifierLoc()); 2401 if (FTI.TypeQuals & Qualifiers::Volatile) 2402 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2403 << "volatile" << SourceRange(D.getIdentifierLoc()); 2404 if (FTI.TypeQuals & Qualifiers::Restrict) 2405 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2406 << "restrict" << SourceRange(D.getIdentifierLoc()); 2407 D.setInvalidType(); 2408 } 2409 2410 // Make sure we don't have any parameters. 2411 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2412 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2413 2414 // Delete the parameters. 2415 FTI.freeArgs(); 2416 D.setInvalidType(); 2417 } 2418 2419 // Make sure the destructor isn't variadic. 2420 if (FTI.isVariadic) { 2421 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2422 D.setInvalidType(); 2423 } 2424 2425 // Rebuild the function type "R" without any type qualifiers or 2426 // parameters (in case any of the errors above fired) and with 2427 // "void" as the return type, since destructors don't have return 2428 // types. We *always* have to do this, because GetTypeForDeclarator 2429 // will put in a result type of "int" when none was specified. 2430 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2431} 2432 2433/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2434/// well-formednes of the conversion function declarator @p D with 2435/// type @p R. If there are any errors in the declarator, this routine 2436/// will emit diagnostics and return true. Otherwise, it will return 2437/// false. Either way, the type @p R will be updated to reflect a 2438/// well-formed type for the conversion operator. 2439void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2440 FunctionDecl::StorageClass& SC) { 2441 // C++ [class.conv.fct]p1: 2442 // Neither parameter types nor return type can be specified. The 2443 // type of a conversion function (8.3.5) is "function taking no 2444 // parameter returning conversion-type-id." 2445 if (SC == FunctionDecl::Static) { 2446 if (!D.isInvalidType()) 2447 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2448 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2449 << SourceRange(D.getIdentifierLoc()); 2450 D.setInvalidType(); 2451 SC = FunctionDecl::None; 2452 } 2453 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2454 // Conversion functions don't have return types, but the parser will 2455 // happily parse something like: 2456 // 2457 // class X { 2458 // float operator bool(); 2459 // }; 2460 // 2461 // The return type will be changed later anyway. 2462 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2463 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2464 << SourceRange(D.getIdentifierLoc()); 2465 } 2466 2467 // Make sure we don't have any parameters. 2468 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2469 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2470 2471 // Delete the parameters. 2472 D.getTypeObject(0).Fun.freeArgs(); 2473 D.setInvalidType(); 2474 } 2475 2476 // Make sure the conversion function isn't variadic. 2477 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2478 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2479 D.setInvalidType(); 2480 } 2481 2482 // C++ [class.conv.fct]p4: 2483 // The conversion-type-id shall not represent a function type nor 2484 // an array type. 2485 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2486 if (ConvType->isArrayType()) { 2487 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2488 ConvType = Context.getPointerType(ConvType); 2489 D.setInvalidType(); 2490 } else if (ConvType->isFunctionType()) { 2491 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2492 ConvType = Context.getPointerType(ConvType); 2493 D.setInvalidType(); 2494 } 2495 2496 // Rebuild the function type "R" without any parameters (in case any 2497 // of the errors above fired) and with the conversion type as the 2498 // return type. 2499 R = Context.getFunctionType(ConvType, 0, 0, false, 2500 R->getAs<FunctionProtoType>()->getTypeQuals()); 2501 2502 // C++0x explicit conversion operators. 2503 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2504 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2505 diag::warn_explicit_conversion_functions) 2506 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2507} 2508 2509/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2510/// the declaration of the given C++ conversion function. This routine 2511/// is responsible for recording the conversion function in the C++ 2512/// class, if possible. 2513Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2514 assert(Conversion && "Expected to receive a conversion function declaration"); 2515 2516 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2517 2518 // Make sure we aren't redeclaring the conversion function. 2519 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2520 2521 // C++ [class.conv.fct]p1: 2522 // [...] A conversion function is never used to convert a 2523 // (possibly cv-qualified) object to the (possibly cv-qualified) 2524 // same object type (or a reference to it), to a (possibly 2525 // cv-qualified) base class of that type (or a reference to it), 2526 // or to (possibly cv-qualified) void. 2527 // FIXME: Suppress this warning if the conversion function ends up being a 2528 // virtual function that overrides a virtual function in a base class. 2529 QualType ClassType 2530 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2531 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2532 ConvType = ConvTypeRef->getPointeeType(); 2533 if (ConvType->isRecordType()) { 2534 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2535 if (ConvType == ClassType) 2536 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2537 << ClassType; 2538 else if (IsDerivedFrom(ClassType, ConvType)) 2539 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2540 << ClassType << ConvType; 2541 } else if (ConvType->isVoidType()) { 2542 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2543 << ClassType << ConvType; 2544 } 2545 2546 if (Conversion->getPreviousDeclaration()) { 2547 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2548 if (FunctionTemplateDecl *ConversionTemplate 2549 = Conversion->getDescribedFunctionTemplate()) 2550 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2551 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2552 for (OverloadedFunctionDecl::function_iterator 2553 Conv = Conversions->function_begin(), 2554 ConvEnd = Conversions->function_end(); 2555 Conv != ConvEnd; ++Conv) { 2556 if (*Conv == ExpectedPrevDecl) { 2557 *Conv = Conversion; 2558 return DeclPtrTy::make(Conversion); 2559 } 2560 } 2561 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2562 } else if (FunctionTemplateDecl *ConversionTemplate 2563 = Conversion->getDescribedFunctionTemplate()) 2564 ClassDecl->addConversionFunction(ConversionTemplate); 2565 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2566 ClassDecl->addConversionFunction(Conversion); 2567 2568 return DeclPtrTy::make(Conversion); 2569} 2570 2571//===----------------------------------------------------------------------===// 2572// Namespace Handling 2573//===----------------------------------------------------------------------===// 2574 2575/// ActOnStartNamespaceDef - This is called at the start of a namespace 2576/// definition. 2577Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2578 SourceLocation IdentLoc, 2579 IdentifierInfo *II, 2580 SourceLocation LBrace) { 2581 NamespaceDecl *Namespc = 2582 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2583 Namespc->setLBracLoc(LBrace); 2584 2585 Scope *DeclRegionScope = NamespcScope->getParent(); 2586 2587 if (II) { 2588 // C++ [namespace.def]p2: 2589 // The identifier in an original-namespace-definition shall not have been 2590 // previously defined in the declarative region in which the 2591 // original-namespace-definition appears. The identifier in an 2592 // original-namespace-definition is the name of the namespace. Subsequently 2593 // in that declarative region, it is treated as an original-namespace-name. 2594 2595 NamedDecl *PrevDecl 2596 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, true); 2597 2598 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2599 // This is an extended namespace definition. 2600 // Attach this namespace decl to the chain of extended namespace 2601 // definitions. 2602 OrigNS->setNextNamespace(Namespc); 2603 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2604 2605 // Remove the previous declaration from the scope. 2606 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2607 IdResolver.RemoveDecl(OrigNS); 2608 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2609 } 2610 } else if (PrevDecl) { 2611 // This is an invalid name redefinition. 2612 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2613 << Namespc->getDeclName(); 2614 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2615 Namespc->setInvalidDecl(); 2616 // Continue on to push Namespc as current DeclContext and return it. 2617 } else if (II->isStr("std") && 2618 CurContext->getLookupContext()->isTranslationUnit()) { 2619 // This is the first "real" definition of the namespace "std", so update 2620 // our cache of the "std" namespace to point at this definition. 2621 if (StdNamespace) { 2622 // We had already defined a dummy namespace "std". Link this new 2623 // namespace definition to the dummy namespace "std". 2624 StdNamespace->setNextNamespace(Namespc); 2625 StdNamespace->setLocation(IdentLoc); 2626 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2627 } 2628 2629 // Make our StdNamespace cache point at the first real definition of the 2630 // "std" namespace. 2631 StdNamespace = Namespc; 2632 } 2633 2634 PushOnScopeChains(Namespc, DeclRegionScope); 2635 } else { 2636 // Anonymous namespaces. 2637 2638 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2639 // behaves as if it were replaced by 2640 // namespace unique { /* empty body */ } 2641 // using namespace unique; 2642 // namespace unique { namespace-body } 2643 // where all occurrences of 'unique' in a translation unit are 2644 // replaced by the same identifier and this identifier differs 2645 // from all other identifiers in the entire program. 2646 2647 // We just create the namespace with an empty name and then add an 2648 // implicit using declaration, just like the standard suggests. 2649 // 2650 // CodeGen enforces the "universally unique" aspect by giving all 2651 // declarations semantically contained within an anonymous 2652 // namespace internal linkage. 2653 2654 assert(Namespc->isAnonymousNamespace()); 2655 CurContext->addDecl(Namespc); 2656 2657 UsingDirectiveDecl* UD 2658 = UsingDirectiveDecl::Create(Context, CurContext, 2659 /* 'using' */ LBrace, 2660 /* 'namespace' */ SourceLocation(), 2661 /* qualifier */ SourceRange(), 2662 /* NNS */ NULL, 2663 /* identifier */ SourceLocation(), 2664 Namespc, 2665 /* Ancestor */ CurContext); 2666 UD->setImplicit(); 2667 CurContext->addDecl(UD); 2668 } 2669 2670 // Although we could have an invalid decl (i.e. the namespace name is a 2671 // redefinition), push it as current DeclContext and try to continue parsing. 2672 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2673 // for the namespace has the declarations that showed up in that particular 2674 // namespace definition. 2675 PushDeclContext(NamespcScope, Namespc); 2676 return DeclPtrTy::make(Namespc); 2677} 2678 2679/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2680/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2681void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2682 Decl *Dcl = D.getAs<Decl>(); 2683 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2684 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2685 Namespc->setRBracLoc(RBrace); 2686 PopDeclContext(); 2687} 2688 2689Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2690 SourceLocation UsingLoc, 2691 SourceLocation NamespcLoc, 2692 const CXXScopeSpec &SS, 2693 SourceLocation IdentLoc, 2694 IdentifierInfo *NamespcName, 2695 AttributeList *AttrList) { 2696 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2697 assert(NamespcName && "Invalid NamespcName."); 2698 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2699 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2700 2701 UsingDirectiveDecl *UDir = 0; 2702 2703 // Lookup namespace name. 2704 LookupResult R; 2705 LookupParsedName(R, S, &SS, NamespcName, LookupNamespaceName, false); 2706 if (R.isAmbiguous()) { 2707 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2708 return DeclPtrTy(); 2709 } 2710 if (!R.empty()) { 2711 NamedDecl *NS = R.getFoundDecl(); 2712 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2713 // C++ [namespace.udir]p1: 2714 // A using-directive specifies that the names in the nominated 2715 // namespace can be used in the scope in which the 2716 // using-directive appears after the using-directive. During 2717 // unqualified name lookup (3.4.1), the names appear as if they 2718 // were declared in the nearest enclosing namespace which 2719 // contains both the using-directive and the nominated 2720 // namespace. [Note: in this context, "contains" means "contains 2721 // directly or indirectly". ] 2722 2723 // Find enclosing context containing both using-directive and 2724 // nominated namespace. 2725 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2726 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2727 CommonAncestor = CommonAncestor->getParent(); 2728 2729 UDir = UsingDirectiveDecl::Create(Context, 2730 CurContext, UsingLoc, 2731 NamespcLoc, 2732 SS.getRange(), 2733 (NestedNameSpecifier *)SS.getScopeRep(), 2734 IdentLoc, 2735 cast<NamespaceDecl>(NS), 2736 CommonAncestor); 2737 PushUsingDirective(S, UDir); 2738 } else { 2739 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2740 } 2741 2742 // FIXME: We ignore attributes for now. 2743 delete AttrList; 2744 return DeclPtrTy::make(UDir); 2745} 2746 2747void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2748 // If scope has associated entity, then using directive is at namespace 2749 // or translation unit scope. We add UsingDirectiveDecls, into 2750 // it's lookup structure. 2751 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2752 Ctx->addDecl(UDir); 2753 else 2754 // Otherwise it is block-sope. using-directives will affect lookup 2755 // only to the end of scope. 2756 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2757} 2758 2759 2760Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2761 AccessSpecifier AS, 2762 SourceLocation UsingLoc, 2763 const CXXScopeSpec &SS, 2764 UnqualifiedId &Name, 2765 AttributeList *AttrList, 2766 bool IsTypeName) { 2767 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2768 2769 switch (Name.getKind()) { 2770 case UnqualifiedId::IK_Identifier: 2771 case UnqualifiedId::IK_OperatorFunctionId: 2772 case UnqualifiedId::IK_ConversionFunctionId: 2773 break; 2774 2775 case UnqualifiedId::IK_ConstructorName: 2776 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2777 << SS.getRange(); 2778 return DeclPtrTy(); 2779 2780 case UnqualifiedId::IK_DestructorName: 2781 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2782 << SS.getRange(); 2783 return DeclPtrTy(); 2784 2785 case UnqualifiedId::IK_TemplateId: 2786 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2787 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2788 return DeclPtrTy(); 2789 } 2790 2791 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2792 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, 2793 Name.getSourceRange().getBegin(), 2794 TargetName, AttrList, IsTypeName); 2795 if (UD) { 2796 PushOnScopeChains(UD, S); 2797 UD->setAccess(AS); 2798 } 2799 2800 return DeclPtrTy::make(UD); 2801} 2802 2803NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2804 const CXXScopeSpec &SS, 2805 SourceLocation IdentLoc, 2806 DeclarationName Name, 2807 AttributeList *AttrList, 2808 bool IsTypeName) { 2809 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2810 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2811 2812 // FIXME: We ignore attributes for now. 2813 delete AttrList; 2814 2815 if (SS.isEmpty()) { 2816 Diag(IdentLoc, diag::err_using_requires_qualname); 2817 return 0; 2818 } 2819 2820 NestedNameSpecifier *NNS = 2821 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2822 2823 if (isUnknownSpecialization(SS)) { 2824 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2825 SS.getRange(), NNS, 2826 IdentLoc, Name, IsTypeName); 2827 } 2828 2829 DeclContext *LookupContext = 0; 2830 2831 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2832 // C++0x N2914 [namespace.udecl]p3: 2833 // A using-declaration used as a member-declaration shall refer to a member 2834 // of a base class of the class being defined, shall refer to a member of an 2835 // anonymous union that is a member of a base class of the class being 2836 // defined, or shall refer to an enumerator for an enumeration type that is 2837 // a member of a base class of the class being defined. 2838 const Type *Ty = NNS->getAsType(); 2839 if (!Ty || !IsDerivedFrom(Context.getTagDeclType(RD), QualType(Ty, 0))) { 2840 Diag(SS.getRange().getBegin(), 2841 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2842 << NNS << RD->getDeclName(); 2843 return 0; 2844 } 2845 2846 QualType BaseTy = Context.getCanonicalType(QualType(Ty, 0)); 2847 LookupContext = BaseTy->getAs<RecordType>()->getDecl(); 2848 } else { 2849 // C++0x N2914 [namespace.udecl]p8: 2850 // A using-declaration for a class member shall be a member-declaration. 2851 if (NNS->getKind() == NestedNameSpecifier::TypeSpec) { 2852 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2853 << SS.getRange(); 2854 return 0; 2855 } 2856 2857 // C++0x N2914 [namespace.udecl]p9: 2858 // In a using-declaration, a prefix :: refers to the global namespace. 2859 if (NNS->getKind() == NestedNameSpecifier::Global) 2860 LookupContext = Context.getTranslationUnitDecl(); 2861 else 2862 LookupContext = NNS->getAsNamespace(); 2863 } 2864 2865 2866 // Lookup target name. 2867 LookupResult R; 2868 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName); 2869 2870 if (R.empty()) { 2871 Diag(IdentLoc, diag::err_no_member) 2872 << Name << LookupContext << SS.getRange(); 2873 return 0; 2874 } 2875 2876 // FIXME: handle ambiguity? 2877 NamedDecl *ND = R.getAsSingleDecl(Context); 2878 2879 if (IsTypeName && !isa<TypeDecl>(ND)) { 2880 Diag(IdentLoc, diag::err_using_typename_non_type); 2881 return 0; 2882 } 2883 2884 // C++0x N2914 [namespace.udecl]p6: 2885 // A using-declaration shall not name a namespace. 2886 if (isa<NamespaceDecl>(ND)) { 2887 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2888 << SS.getRange(); 2889 return 0; 2890 } 2891 2892 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2893 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2894} 2895 2896/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2897/// is a namespace alias, returns the namespace it points to. 2898static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2899 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2900 return AD->getNamespace(); 2901 return dyn_cast_or_null<NamespaceDecl>(D); 2902} 2903 2904Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2905 SourceLocation NamespaceLoc, 2906 SourceLocation AliasLoc, 2907 IdentifierInfo *Alias, 2908 const CXXScopeSpec &SS, 2909 SourceLocation IdentLoc, 2910 IdentifierInfo *Ident) { 2911 2912 // Lookup the namespace name. 2913 LookupResult R; 2914 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false); 2915 2916 // Check if we have a previous declaration with the same name. 2917 if (NamedDecl *PrevDecl 2918 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) { 2919 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2920 // We already have an alias with the same name that points to the same 2921 // namespace, so don't create a new one. 2922 if (!R.isAmbiguous() && !R.empty() && 2923 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 2924 return DeclPtrTy(); 2925 } 2926 2927 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2928 diag::err_redefinition_different_kind; 2929 Diag(AliasLoc, DiagID) << Alias; 2930 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2931 return DeclPtrTy(); 2932 } 2933 2934 if (R.isAmbiguous()) { 2935 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2936 return DeclPtrTy(); 2937 } 2938 2939 if (R.empty()) { 2940 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2941 return DeclPtrTy(); 2942 } 2943 2944 NamespaceAliasDecl *AliasDecl = 2945 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2946 Alias, SS.getRange(), 2947 (NestedNameSpecifier *)SS.getScopeRep(), 2948 IdentLoc, R.getFoundDecl()); 2949 2950 CurContext->addDecl(AliasDecl); 2951 return DeclPtrTy::make(AliasDecl); 2952} 2953 2954void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2955 CXXConstructorDecl *Constructor) { 2956 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2957 !Constructor->isUsed()) && 2958 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2959 2960 SetBaseOrMemberInitializers(Constructor, 0, 0, true); 2961 2962 Constructor->setUsed(); 2963 return; 2964} 2965 2966void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2967 CXXDestructorDecl *Destructor) { 2968 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2969 "DefineImplicitDestructor - call it for implicit default dtor"); 2970 2971 CXXRecordDecl *ClassDecl 2972 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2973 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2974 // C++ [class.dtor] p5 2975 // Before the implicitly-declared default destructor for a class is 2976 // implicitly defined, all the implicitly-declared default destructors 2977 // for its base class and its non-static data members shall have been 2978 // implicitly defined. 2979 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2980 E = ClassDecl->bases_end(); Base != E; ++Base) { 2981 CXXRecordDecl *BaseClassDecl 2982 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2983 if (!BaseClassDecl->hasTrivialDestructor()) { 2984 if (CXXDestructorDecl *BaseDtor = 2985 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2986 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2987 else 2988 assert(false && 2989 "DefineImplicitDestructor - missing dtor in a base class"); 2990 } 2991 } 2992 2993 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2994 E = ClassDecl->field_end(); Field != E; ++Field) { 2995 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2996 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2997 FieldType = Array->getElementType(); 2998 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2999 CXXRecordDecl *FieldClassDecl 3000 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3001 if (!FieldClassDecl->hasTrivialDestructor()) { 3002 if (CXXDestructorDecl *FieldDtor = 3003 const_cast<CXXDestructorDecl*>( 3004 FieldClassDecl->getDestructor(Context))) 3005 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3006 else 3007 assert(false && 3008 "DefineImplicitDestructor - missing dtor in class of a data member"); 3009 } 3010 } 3011 } 3012 Destructor->setUsed(); 3013} 3014 3015void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3016 CXXMethodDecl *MethodDecl) { 3017 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3018 MethodDecl->getOverloadedOperator() == OO_Equal && 3019 !MethodDecl->isUsed()) && 3020 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3021 3022 CXXRecordDecl *ClassDecl 3023 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3024 3025 // C++[class.copy] p12 3026 // Before the implicitly-declared copy assignment operator for a class is 3027 // implicitly defined, all implicitly-declared copy assignment operators 3028 // for its direct base classes and its nonstatic data members shall have 3029 // been implicitly defined. 3030 bool err = false; 3031 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3032 E = ClassDecl->bases_end(); Base != E; ++Base) { 3033 CXXRecordDecl *BaseClassDecl 3034 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3035 if (CXXMethodDecl *BaseAssignOpMethod = 3036 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3037 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3038 } 3039 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3040 E = ClassDecl->field_end(); Field != E; ++Field) { 3041 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3042 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3043 FieldType = Array->getElementType(); 3044 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3045 CXXRecordDecl *FieldClassDecl 3046 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3047 if (CXXMethodDecl *FieldAssignOpMethod = 3048 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3049 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3050 } else if (FieldType->isReferenceType()) { 3051 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3052 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3053 Diag(Field->getLocation(), diag::note_declared_at); 3054 Diag(CurrentLocation, diag::note_first_required_here); 3055 err = true; 3056 } else if (FieldType.isConstQualified()) { 3057 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3058 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3059 Diag(Field->getLocation(), diag::note_declared_at); 3060 Diag(CurrentLocation, diag::note_first_required_here); 3061 err = true; 3062 } 3063 } 3064 if (!err) 3065 MethodDecl->setUsed(); 3066} 3067 3068CXXMethodDecl * 3069Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3070 CXXRecordDecl *ClassDecl) { 3071 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3072 QualType RHSType(LHSType); 3073 // If class's assignment operator argument is const/volatile qualified, 3074 // look for operator = (const/volatile B&). Otherwise, look for 3075 // operator = (B&). 3076 RHSType = Context.getCVRQualifiedType(RHSType, 3077 ParmDecl->getType().getCVRQualifiers()); 3078 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3079 LHSType, 3080 SourceLocation())); 3081 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3082 RHSType, 3083 SourceLocation())); 3084 Expr *Args[2] = { &*LHS, &*RHS }; 3085 OverloadCandidateSet CandidateSet; 3086 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3087 CandidateSet); 3088 OverloadCandidateSet::iterator Best; 3089 if (BestViableFunction(CandidateSet, 3090 ClassDecl->getLocation(), Best) == OR_Success) 3091 return cast<CXXMethodDecl>(Best->Function); 3092 assert(false && 3093 "getAssignOperatorMethod - copy assignment operator method not found"); 3094 return 0; 3095} 3096 3097void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3098 CXXConstructorDecl *CopyConstructor, 3099 unsigned TypeQuals) { 3100 assert((CopyConstructor->isImplicit() && 3101 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3102 !CopyConstructor->isUsed()) && 3103 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3104 3105 CXXRecordDecl *ClassDecl 3106 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3107 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3108 // C++ [class.copy] p209 3109 // Before the implicitly-declared copy constructor for a class is 3110 // implicitly defined, all the implicitly-declared copy constructors 3111 // for its base class and its non-static data members shall have been 3112 // implicitly defined. 3113 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3114 Base != ClassDecl->bases_end(); ++Base) { 3115 CXXRecordDecl *BaseClassDecl 3116 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3117 if (CXXConstructorDecl *BaseCopyCtor = 3118 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3119 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3120 } 3121 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3122 FieldEnd = ClassDecl->field_end(); 3123 Field != FieldEnd; ++Field) { 3124 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3125 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3126 FieldType = Array->getElementType(); 3127 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3128 CXXRecordDecl *FieldClassDecl 3129 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3130 if (CXXConstructorDecl *FieldCopyCtor = 3131 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3132 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3133 } 3134 } 3135 CopyConstructor->setUsed(); 3136} 3137 3138Sema::OwningExprResult 3139Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3140 CXXConstructorDecl *Constructor, 3141 MultiExprArg ExprArgs) { 3142 bool Elidable = false; 3143 3144 // C++ [class.copy]p15: 3145 // Whenever a temporary class object is copied using a copy constructor, and 3146 // this object and the copy have the same cv-unqualified type, an 3147 // implementation is permitted to treat the original and the copy as two 3148 // different ways of referring to the same object and not perform a copy at 3149 // all, even if the class copy constructor or destructor have side effects. 3150 3151 // FIXME: Is this enough? 3152 if (Constructor->isCopyConstructor(Context)) { 3153 Expr *E = ((Expr **)ExprArgs.get())[0]; 3154 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3155 E = BE->getSubExpr(); 3156 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3157 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3158 E = ICE->getSubExpr(); 3159 3160 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3161 Elidable = true; 3162 } 3163 3164 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3165 Elidable, move(ExprArgs)); 3166} 3167 3168/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3169/// including handling of its default argument expressions. 3170Sema::OwningExprResult 3171Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3172 CXXConstructorDecl *Constructor, bool Elidable, 3173 MultiExprArg ExprArgs) { 3174 unsigned NumExprs = ExprArgs.size(); 3175 Expr **Exprs = (Expr **)ExprArgs.release(); 3176 3177 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3178 Elidable, Exprs, NumExprs)); 3179} 3180 3181Sema::OwningExprResult 3182Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3183 QualType Ty, 3184 SourceLocation TyBeginLoc, 3185 MultiExprArg Args, 3186 SourceLocation RParenLoc) { 3187 unsigned NumExprs = Args.size(); 3188 Expr **Exprs = (Expr **)Args.release(); 3189 3190 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3191 TyBeginLoc, Exprs, 3192 NumExprs, RParenLoc)); 3193} 3194 3195 3196bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3197 CXXConstructorDecl *Constructor, 3198 MultiExprArg Exprs) { 3199 OwningExprResult TempResult = 3200 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3201 move(Exprs)); 3202 if (TempResult.isInvalid()) 3203 return true; 3204 3205 Expr *Temp = TempResult.takeAs<Expr>(); 3206 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3207 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3208 VD->setInit(Context, Temp); 3209 3210 return false; 3211} 3212 3213void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3214 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3215 DeclInitType->getAs<RecordType>()->getDecl()); 3216 if (!ClassDecl->hasTrivialDestructor()) 3217 if (CXXDestructorDecl *Destructor = 3218 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3219 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3220} 3221 3222/// AddCXXDirectInitializerToDecl - This action is called immediately after 3223/// ActOnDeclarator, when a C++ direct initializer is present. 3224/// e.g: "int x(1);" 3225void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3226 SourceLocation LParenLoc, 3227 MultiExprArg Exprs, 3228 SourceLocation *CommaLocs, 3229 SourceLocation RParenLoc) { 3230 unsigned NumExprs = Exprs.size(); 3231 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3232 Decl *RealDecl = Dcl.getAs<Decl>(); 3233 3234 // If there is no declaration, there was an error parsing it. Just ignore 3235 // the initializer. 3236 if (RealDecl == 0) 3237 return; 3238 3239 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3240 if (!VDecl) { 3241 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3242 RealDecl->setInvalidDecl(); 3243 return; 3244 } 3245 3246 // We will represent direct-initialization similarly to copy-initialization: 3247 // int x(1); -as-> int x = 1; 3248 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3249 // 3250 // Clients that want to distinguish between the two forms, can check for 3251 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3252 // A major benefit is that clients that don't particularly care about which 3253 // exactly form was it (like the CodeGen) can handle both cases without 3254 // special case code. 3255 3256 // If either the declaration has a dependent type or if any of the expressions 3257 // is type-dependent, we represent the initialization via a ParenListExpr for 3258 // later use during template instantiation. 3259 if (VDecl->getType()->isDependentType() || 3260 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3261 // Let clients know that initialization was done with a direct initializer. 3262 VDecl->setCXXDirectInitializer(true); 3263 3264 // Store the initialization expressions as a ParenListExpr. 3265 unsigned NumExprs = Exprs.size(); 3266 VDecl->setInit(Context, 3267 new (Context) ParenListExpr(Context, LParenLoc, 3268 (Expr **)Exprs.release(), 3269 NumExprs, RParenLoc)); 3270 return; 3271 } 3272 3273 3274 // C++ 8.5p11: 3275 // The form of initialization (using parentheses or '=') is generally 3276 // insignificant, but does matter when the entity being initialized has a 3277 // class type. 3278 QualType DeclInitType = VDecl->getType(); 3279 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3280 DeclInitType = Context.getBaseElementType(Array); 3281 3282 // FIXME: This isn't the right place to complete the type. 3283 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3284 diag::err_typecheck_decl_incomplete_type)) { 3285 VDecl->setInvalidDecl(); 3286 return; 3287 } 3288 3289 if (VDecl->getType()->isRecordType()) { 3290 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3291 3292 CXXConstructorDecl *Constructor 3293 = PerformInitializationByConstructor(DeclInitType, 3294 move(Exprs), 3295 VDecl->getLocation(), 3296 SourceRange(VDecl->getLocation(), 3297 RParenLoc), 3298 VDecl->getDeclName(), 3299 IK_Direct, 3300 ConstructorArgs); 3301 if (!Constructor) 3302 RealDecl->setInvalidDecl(); 3303 else { 3304 VDecl->setCXXDirectInitializer(true); 3305 if (InitializeVarWithConstructor(VDecl, Constructor, 3306 move_arg(ConstructorArgs))) 3307 RealDecl->setInvalidDecl(); 3308 FinalizeVarWithDestructor(VDecl, DeclInitType); 3309 } 3310 return; 3311 } 3312 3313 if (NumExprs > 1) { 3314 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3315 << SourceRange(VDecl->getLocation(), RParenLoc); 3316 RealDecl->setInvalidDecl(); 3317 return; 3318 } 3319 3320 // Let clients know that initialization was done with a direct initializer. 3321 VDecl->setCXXDirectInitializer(true); 3322 3323 assert(NumExprs == 1 && "Expected 1 expression"); 3324 // Set the init expression, handles conversions. 3325 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3326 /*DirectInit=*/true); 3327} 3328 3329/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3330/// may occur as part of direct-initialization or copy-initialization. 3331/// 3332/// \param ClassType the type of the object being initialized, which must have 3333/// class type. 3334/// 3335/// \param ArgsPtr the arguments provided to initialize the object 3336/// 3337/// \param Loc the source location where the initialization occurs 3338/// 3339/// \param Range the source range that covers the entire initialization 3340/// 3341/// \param InitEntity the name of the entity being initialized, if known 3342/// 3343/// \param Kind the type of initialization being performed 3344/// 3345/// \param ConvertedArgs a vector that will be filled in with the 3346/// appropriately-converted arguments to the constructor (if initialization 3347/// succeeded). 3348/// 3349/// \returns the constructor used to initialize the object, if successful. 3350/// Otherwise, emits a diagnostic and returns NULL. 3351CXXConstructorDecl * 3352Sema::PerformInitializationByConstructor(QualType ClassType, 3353 MultiExprArg ArgsPtr, 3354 SourceLocation Loc, SourceRange Range, 3355 DeclarationName InitEntity, 3356 InitializationKind Kind, 3357 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3358 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3359 assert(ClassRec && "Can only initialize a class type here"); 3360 Expr **Args = (Expr **)ArgsPtr.get(); 3361 unsigned NumArgs = ArgsPtr.size(); 3362 3363 // C++ [dcl.init]p14: 3364 // If the initialization is direct-initialization, or if it is 3365 // copy-initialization where the cv-unqualified version of the 3366 // source type is the same class as, or a derived class of, the 3367 // class of the destination, constructors are considered. The 3368 // applicable constructors are enumerated (13.3.1.3), and the 3369 // best one is chosen through overload resolution (13.3). The 3370 // constructor so selected is called to initialize the object, 3371 // with the initializer expression(s) as its argument(s). If no 3372 // constructor applies, or the overload resolution is ambiguous, 3373 // the initialization is ill-formed. 3374 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3375 OverloadCandidateSet CandidateSet; 3376 3377 // Add constructors to the overload set. 3378 DeclarationName ConstructorName 3379 = Context.DeclarationNames.getCXXConstructorName( 3380 Context.getCanonicalType(ClassType).getUnqualifiedType()); 3381 DeclContext::lookup_const_iterator Con, ConEnd; 3382 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3383 Con != ConEnd; ++Con) { 3384 // Find the constructor (which may be a template). 3385 CXXConstructorDecl *Constructor = 0; 3386 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3387 if (ConstructorTmpl) 3388 Constructor 3389 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3390 else 3391 Constructor = cast<CXXConstructorDecl>(*Con); 3392 3393 if ((Kind == IK_Direct) || 3394 (Kind == IK_Copy && 3395 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3396 (Kind == IK_Default && Constructor->isDefaultConstructor())) { 3397 if (ConstructorTmpl) 3398 AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3399 Args, NumArgs, CandidateSet); 3400 else 3401 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3402 } 3403 } 3404 3405 // FIXME: When we decide not to synthesize the implicitly-declared 3406 // constructors, we'll need to make them appear here. 3407 3408 OverloadCandidateSet::iterator Best; 3409 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3410 case OR_Success: 3411 // We found a constructor. Break out so that we can convert the arguments 3412 // appropriately. 3413 break; 3414 3415 case OR_No_Viable_Function: 3416 if (InitEntity) 3417 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3418 << InitEntity << Range; 3419 else 3420 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3421 << ClassType << Range; 3422 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3423 return 0; 3424 3425 case OR_Ambiguous: 3426 if (InitEntity) 3427 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3428 else 3429 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3430 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3431 return 0; 3432 3433 case OR_Deleted: 3434 if (InitEntity) 3435 Diag(Loc, diag::err_ovl_deleted_init) 3436 << Best->Function->isDeleted() 3437 << InitEntity << Range; 3438 else 3439 Diag(Loc, diag::err_ovl_deleted_init) 3440 << Best->Function->isDeleted() 3441 << InitEntity << Range; 3442 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3443 return 0; 3444 } 3445 3446 // Convert the arguments, fill in default arguments, etc. 3447 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3448 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3449 return 0; 3450 3451 return Constructor; 3452} 3453 3454/// \brief Given a constructor and the set of arguments provided for the 3455/// constructor, convert the arguments and add any required default arguments 3456/// to form a proper call to this constructor. 3457/// 3458/// \returns true if an error occurred, false otherwise. 3459bool 3460Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3461 MultiExprArg ArgsPtr, 3462 SourceLocation Loc, 3463 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3464 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3465 unsigned NumArgs = ArgsPtr.size(); 3466 Expr **Args = (Expr **)ArgsPtr.get(); 3467 3468 const FunctionProtoType *Proto 3469 = Constructor->getType()->getAs<FunctionProtoType>(); 3470 assert(Proto && "Constructor without a prototype?"); 3471 unsigned NumArgsInProto = Proto->getNumArgs(); 3472 unsigned NumArgsToCheck = NumArgs; 3473 3474 // If too few arguments are available, we'll fill in the rest with defaults. 3475 if (NumArgs < NumArgsInProto) { 3476 NumArgsToCheck = NumArgsInProto; 3477 ConvertedArgs.reserve(NumArgsInProto); 3478 } else { 3479 ConvertedArgs.reserve(NumArgs); 3480 if (NumArgs > NumArgsInProto) 3481 NumArgsToCheck = NumArgsInProto; 3482 } 3483 3484 // Convert arguments 3485 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3486 QualType ProtoArgType = Proto->getArgType(i); 3487 3488 Expr *Arg; 3489 if (i < NumArgs) { 3490 Arg = Args[i]; 3491 3492 // Pass the argument. 3493 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3494 return true; 3495 3496 Args[i] = 0; 3497 } else { 3498 ParmVarDecl *Param = Constructor->getParamDecl(i); 3499 3500 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3501 if (DefArg.isInvalid()) 3502 return true; 3503 3504 Arg = DefArg.takeAs<Expr>(); 3505 } 3506 3507 ConvertedArgs.push_back(Arg); 3508 } 3509 3510 // If this is a variadic call, handle args passed through "...". 3511 if (Proto->isVariadic()) { 3512 // Promote the arguments (C99 6.5.2.2p7). 3513 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3514 Expr *Arg = Args[i]; 3515 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3516 return true; 3517 3518 ConvertedArgs.push_back(Arg); 3519 Args[i] = 0; 3520 } 3521 } 3522 3523 return false; 3524} 3525 3526/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3527/// determine whether they are reference-related, 3528/// reference-compatible, reference-compatible with added 3529/// qualification, or incompatible, for use in C++ initialization by 3530/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3531/// type, and the first type (T1) is the pointee type of the reference 3532/// type being initialized. 3533Sema::ReferenceCompareResult 3534Sema::CompareReferenceRelationship(SourceLocation Loc, 3535 QualType OrigT1, QualType OrigT2, 3536 bool& DerivedToBase) { 3537 assert(!OrigT1->isReferenceType() && 3538 "T1 must be the pointee type of the reference type"); 3539 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3540 3541 QualType T1 = Context.getCanonicalType(OrigT1); 3542 QualType T2 = Context.getCanonicalType(OrigT2); 3543 QualType UnqualT1 = T1.getUnqualifiedType(); 3544 QualType UnqualT2 = T2.getUnqualifiedType(); 3545 3546 // C++ [dcl.init.ref]p4: 3547 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3548 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3549 // T1 is a base class of T2. 3550 if (UnqualT1 == UnqualT2) 3551 DerivedToBase = false; 3552 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3553 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3554 IsDerivedFrom(UnqualT2, UnqualT1)) 3555 DerivedToBase = true; 3556 else 3557 return Ref_Incompatible; 3558 3559 // At this point, we know that T1 and T2 are reference-related (at 3560 // least). 3561 3562 // C++ [dcl.init.ref]p4: 3563 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3564 // reference-related to T2 and cv1 is the same cv-qualification 3565 // as, or greater cv-qualification than, cv2. For purposes of 3566 // overload resolution, cases for which cv1 is greater 3567 // cv-qualification than cv2 are identified as 3568 // reference-compatible with added qualification (see 13.3.3.2). 3569 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3570 return Ref_Compatible; 3571 else if (T1.isMoreQualifiedThan(T2)) 3572 return Ref_Compatible_With_Added_Qualification; 3573 else 3574 return Ref_Related; 3575} 3576 3577/// CheckReferenceInit - Check the initialization of a reference 3578/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3579/// the initializer (either a simple initializer or an initializer 3580/// list), and DeclType is the type of the declaration. When ICS is 3581/// non-null, this routine will compute the implicit conversion 3582/// sequence according to C++ [over.ics.ref] and will not produce any 3583/// diagnostics; when ICS is null, it will emit diagnostics when any 3584/// errors are found. Either way, a return value of true indicates 3585/// that there was a failure, a return value of false indicates that 3586/// the reference initialization succeeded. 3587/// 3588/// When @p SuppressUserConversions, user-defined conversions are 3589/// suppressed. 3590/// When @p AllowExplicit, we also permit explicit user-defined 3591/// conversion functions. 3592/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3593bool 3594Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3595 SourceLocation DeclLoc, 3596 bool SuppressUserConversions, 3597 bool AllowExplicit, bool ForceRValue, 3598 ImplicitConversionSequence *ICS) { 3599 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3600 3601 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3602 QualType T2 = Init->getType(); 3603 3604 // If the initializer is the address of an overloaded function, try 3605 // to resolve the overloaded function. If all goes well, T2 is the 3606 // type of the resulting function. 3607 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3608 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3609 ICS != 0); 3610 if (Fn) { 3611 // Since we're performing this reference-initialization for 3612 // real, update the initializer with the resulting function. 3613 if (!ICS) { 3614 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3615 return true; 3616 3617 Init = FixOverloadedFunctionReference(Init, Fn); 3618 } 3619 3620 T2 = Fn->getType(); 3621 } 3622 } 3623 3624 // Compute some basic properties of the types and the initializer. 3625 bool isRValRef = DeclType->isRValueReferenceType(); 3626 bool DerivedToBase = false; 3627 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3628 Init->isLvalue(Context); 3629 ReferenceCompareResult RefRelationship 3630 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3631 3632 // Most paths end in a failed conversion. 3633 if (ICS) 3634 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3635 3636 // C++ [dcl.init.ref]p5: 3637 // A reference to type "cv1 T1" is initialized by an expression 3638 // of type "cv2 T2" as follows: 3639 3640 // -- If the initializer expression 3641 3642 // Rvalue references cannot bind to lvalues (N2812). 3643 // There is absolutely no situation where they can. In particular, note that 3644 // this is ill-formed, even if B has a user-defined conversion to A&&: 3645 // B b; 3646 // A&& r = b; 3647 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3648 if (!ICS) 3649 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3650 << Init->getSourceRange(); 3651 return true; 3652 } 3653 3654 bool BindsDirectly = false; 3655 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3656 // reference-compatible with "cv2 T2," or 3657 // 3658 // Note that the bit-field check is skipped if we are just computing 3659 // the implicit conversion sequence (C++ [over.best.ics]p2). 3660 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3661 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3662 BindsDirectly = true; 3663 3664 if (ICS) { 3665 // C++ [over.ics.ref]p1: 3666 // When a parameter of reference type binds directly (8.5.3) 3667 // to an argument expression, the implicit conversion sequence 3668 // is the identity conversion, unless the argument expression 3669 // has a type that is a derived class of the parameter type, 3670 // in which case the implicit conversion sequence is a 3671 // derived-to-base Conversion (13.3.3.1). 3672 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3673 ICS->Standard.First = ICK_Identity; 3674 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3675 ICS->Standard.Third = ICK_Identity; 3676 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3677 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3678 ICS->Standard.ReferenceBinding = true; 3679 ICS->Standard.DirectBinding = true; 3680 ICS->Standard.RRefBinding = false; 3681 ICS->Standard.CopyConstructor = 0; 3682 3683 // Nothing more to do: the inaccessibility/ambiguity check for 3684 // derived-to-base conversions is suppressed when we're 3685 // computing the implicit conversion sequence (C++ 3686 // [over.best.ics]p2). 3687 return false; 3688 } else { 3689 // Perform the conversion. 3690 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3691 if (DerivedToBase) 3692 CK = CastExpr::CK_DerivedToBase; 3693 else if(CheckExceptionSpecCompatibility(Init, T1)) 3694 return true; 3695 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3696 } 3697 } 3698 3699 // -- has a class type (i.e., T2 is a class type) and can be 3700 // implicitly converted to an lvalue of type "cv3 T3," 3701 // where "cv1 T1" is reference-compatible with "cv3 T3" 3702 // 92) (this conversion is selected by enumerating the 3703 // applicable conversion functions (13.3.1.6) and choosing 3704 // the best one through overload resolution (13.3)), 3705 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3706 !RequireCompleteType(DeclLoc, T2, 0)) { 3707 CXXRecordDecl *T2RecordDecl 3708 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3709 3710 OverloadCandidateSet CandidateSet; 3711 OverloadedFunctionDecl *Conversions 3712 = T2RecordDecl->getVisibleConversionFunctions(); 3713 for (OverloadedFunctionDecl::function_iterator Func 3714 = Conversions->function_begin(); 3715 Func != Conversions->function_end(); ++Func) { 3716 FunctionTemplateDecl *ConvTemplate 3717 = dyn_cast<FunctionTemplateDecl>(*Func); 3718 CXXConversionDecl *Conv; 3719 if (ConvTemplate) 3720 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3721 else 3722 Conv = cast<CXXConversionDecl>(*Func); 3723 3724 // If the conversion function doesn't return a reference type, 3725 // it can't be considered for this conversion. 3726 if (Conv->getConversionType()->isLValueReferenceType() && 3727 (AllowExplicit || !Conv->isExplicit())) { 3728 if (ConvTemplate) 3729 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3730 CandidateSet); 3731 else 3732 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3733 } 3734 } 3735 3736 OverloadCandidateSet::iterator Best; 3737 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3738 case OR_Success: 3739 // This is a direct binding. 3740 BindsDirectly = true; 3741 3742 if (ICS) { 3743 // C++ [over.ics.ref]p1: 3744 // 3745 // [...] If the parameter binds directly to the result of 3746 // applying a conversion function to the argument 3747 // expression, the implicit conversion sequence is a 3748 // user-defined conversion sequence (13.3.3.1.2), with the 3749 // second standard conversion sequence either an identity 3750 // conversion or, if the conversion function returns an 3751 // entity of a type that is a derived class of the parameter 3752 // type, a derived-to-base Conversion. 3753 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3754 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3755 ICS->UserDefined.After = Best->FinalConversion; 3756 ICS->UserDefined.ConversionFunction = Best->Function; 3757 ICS->UserDefined.EllipsisConversion = false; 3758 assert(ICS->UserDefined.After.ReferenceBinding && 3759 ICS->UserDefined.After.DirectBinding && 3760 "Expected a direct reference binding!"); 3761 return false; 3762 } else { 3763 OwningExprResult InitConversion = 3764 BuildCXXCastArgument(DeclLoc, QualType(), 3765 CastExpr::CK_UserDefinedConversion, 3766 cast<CXXMethodDecl>(Best->Function), 3767 Owned(Init)); 3768 Init = InitConversion.takeAs<Expr>(); 3769 3770 if (CheckExceptionSpecCompatibility(Init, T1)) 3771 return true; 3772 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3773 /*isLvalue=*/true); 3774 } 3775 break; 3776 3777 case OR_Ambiguous: 3778 if (ICS) { 3779 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3780 Cand != CandidateSet.end(); ++Cand) 3781 if (Cand->Viable) 3782 ICS->ConversionFunctionSet.push_back(Cand->Function); 3783 break; 3784 } 3785 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3786 << Init->getSourceRange(); 3787 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3788 return true; 3789 3790 case OR_No_Viable_Function: 3791 case OR_Deleted: 3792 // There was no suitable conversion, or we found a deleted 3793 // conversion; continue with other checks. 3794 break; 3795 } 3796 } 3797 3798 if (BindsDirectly) { 3799 // C++ [dcl.init.ref]p4: 3800 // [...] In all cases where the reference-related or 3801 // reference-compatible relationship of two types is used to 3802 // establish the validity of a reference binding, and T1 is a 3803 // base class of T2, a program that necessitates such a binding 3804 // is ill-formed if T1 is an inaccessible (clause 11) or 3805 // ambiguous (10.2) base class of T2. 3806 // 3807 // Note that we only check this condition when we're allowed to 3808 // complain about errors, because we should not be checking for 3809 // ambiguity (or inaccessibility) unless the reference binding 3810 // actually happens. 3811 if (DerivedToBase) 3812 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3813 Init->getSourceRange()); 3814 else 3815 return false; 3816 } 3817 3818 // -- Otherwise, the reference shall be to a non-volatile const 3819 // type (i.e., cv1 shall be const), or the reference shall be an 3820 // rvalue reference and the initializer expression shall be an rvalue. 3821 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3822 if (!ICS) 3823 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3824 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3825 << T2 << Init->getSourceRange(); 3826 return true; 3827 } 3828 3829 // -- If the initializer expression is an rvalue, with T2 a 3830 // class type, and "cv1 T1" is reference-compatible with 3831 // "cv2 T2," the reference is bound in one of the 3832 // following ways (the choice is implementation-defined): 3833 // 3834 // -- The reference is bound to the object represented by 3835 // the rvalue (see 3.10) or to a sub-object within that 3836 // object. 3837 // 3838 // -- A temporary of type "cv1 T2" [sic] is created, and 3839 // a constructor is called to copy the entire rvalue 3840 // object into the temporary. The reference is bound to 3841 // the temporary or to a sub-object within the 3842 // temporary. 3843 // 3844 // The constructor that would be used to make the copy 3845 // shall be callable whether or not the copy is actually 3846 // done. 3847 // 3848 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3849 // freedom, so we will always take the first option and never build 3850 // a temporary in this case. FIXME: We will, however, have to check 3851 // for the presence of a copy constructor in C++98/03 mode. 3852 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3853 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3854 if (ICS) { 3855 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3856 ICS->Standard.First = ICK_Identity; 3857 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3858 ICS->Standard.Third = ICK_Identity; 3859 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3860 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3861 ICS->Standard.ReferenceBinding = true; 3862 ICS->Standard.DirectBinding = false; 3863 ICS->Standard.RRefBinding = isRValRef; 3864 ICS->Standard.CopyConstructor = 0; 3865 } else { 3866 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3867 if (DerivedToBase) 3868 CK = CastExpr::CK_DerivedToBase; 3869 else if(CheckExceptionSpecCompatibility(Init, T1)) 3870 return true; 3871 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 3872 } 3873 return false; 3874 } 3875 3876 // -- Otherwise, a temporary of type "cv1 T1" is created and 3877 // initialized from the initializer expression using the 3878 // rules for a non-reference copy initialization (8.5). The 3879 // reference is then bound to the temporary. If T1 is 3880 // reference-related to T2, cv1 must be the same 3881 // cv-qualification as, or greater cv-qualification than, 3882 // cv2; otherwise, the program is ill-formed. 3883 if (RefRelationship == Ref_Related) { 3884 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3885 // we would be reference-compatible or reference-compatible with 3886 // added qualification. But that wasn't the case, so the reference 3887 // initialization fails. 3888 if (!ICS) 3889 Diag(DeclLoc, diag::err_reference_init_drops_quals) 3890 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3891 << T2 << Init->getSourceRange(); 3892 return true; 3893 } 3894 3895 // If at least one of the types is a class type, the types are not 3896 // related, and we aren't allowed any user conversions, the 3897 // reference binding fails. This case is important for breaking 3898 // recursion, since TryImplicitConversion below will attempt to 3899 // create a temporary through the use of a copy constructor. 3900 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3901 (T1->isRecordType() || T2->isRecordType())) { 3902 if (!ICS) 3903 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 3904 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3905 return true; 3906 } 3907 3908 // Actually try to convert the initializer to T1. 3909 if (ICS) { 3910 // C++ [over.ics.ref]p2: 3911 // 3912 // When a parameter of reference type is not bound directly to 3913 // an argument expression, the conversion sequence is the one 3914 // required to convert the argument expression to the 3915 // underlying type of the reference according to 3916 // 13.3.3.1. Conceptually, this conversion sequence corresponds 3917 // to copy-initializing a temporary of the underlying type with 3918 // the argument expression. Any difference in top-level 3919 // cv-qualification is subsumed by the initialization itself 3920 // and does not constitute a conversion. 3921 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 3922 /*AllowExplicit=*/false, 3923 /*ForceRValue=*/false, 3924 /*InOverloadResolution=*/false); 3925 3926 // Of course, that's still a reference binding. 3927 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3928 ICS->Standard.ReferenceBinding = true; 3929 ICS->Standard.RRefBinding = isRValRef; 3930 } else if (ICS->ConversionKind == 3931 ImplicitConversionSequence::UserDefinedConversion) { 3932 ICS->UserDefined.After.ReferenceBinding = true; 3933 ICS->UserDefined.After.RRefBinding = isRValRef; 3934 } 3935 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3936 } else { 3937 ImplicitConversionSequence Conversions; 3938 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 3939 false, false, 3940 Conversions); 3941 if (badConversion) { 3942 if ((Conversions.ConversionKind == 3943 ImplicitConversionSequence::BadConversion) 3944 && !Conversions.ConversionFunctionSet.empty()) { 3945 Diag(DeclLoc, 3946 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 3947 for (int j = Conversions.ConversionFunctionSet.size()-1; 3948 j >= 0; j--) { 3949 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 3950 Diag(Func->getLocation(), diag::err_ovl_candidate); 3951 } 3952 } 3953 else { 3954 if (isRValRef) 3955 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3956 << Init->getSourceRange(); 3957 else 3958 Diag(DeclLoc, diag::err_invalid_initialization) 3959 << DeclType << Init->getType() << Init->getSourceRange(); 3960 } 3961 } 3962 return badConversion; 3963 } 3964} 3965 3966/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3967/// of this overloaded operator is well-formed. If so, returns false; 3968/// otherwise, emits appropriate diagnostics and returns true. 3969bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3970 assert(FnDecl && FnDecl->isOverloadedOperator() && 3971 "Expected an overloaded operator declaration"); 3972 3973 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3974 3975 // C++ [over.oper]p5: 3976 // The allocation and deallocation functions, operator new, 3977 // operator new[], operator delete and operator delete[], are 3978 // described completely in 3.7.3. The attributes and restrictions 3979 // found in the rest of this subclause do not apply to them unless 3980 // explicitly stated in 3.7.3. 3981 // FIXME: Write a separate routine for checking this. For now, just allow it. 3982 if (Op == OO_New || Op == OO_Array_New || 3983 Op == OO_Delete || Op == OO_Array_Delete) 3984 return false; 3985 3986 // C++ [over.oper]p6: 3987 // An operator function shall either be a non-static member 3988 // function or be a non-member function and have at least one 3989 // parameter whose type is a class, a reference to a class, an 3990 // enumeration, or a reference to an enumeration. 3991 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3992 if (MethodDecl->isStatic()) 3993 return Diag(FnDecl->getLocation(), 3994 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3995 } else { 3996 bool ClassOrEnumParam = false; 3997 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3998 ParamEnd = FnDecl->param_end(); 3999 Param != ParamEnd; ++Param) { 4000 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4001 if (ParamType->isDependentType() || ParamType->isRecordType() || 4002 ParamType->isEnumeralType()) { 4003 ClassOrEnumParam = true; 4004 break; 4005 } 4006 } 4007 4008 if (!ClassOrEnumParam) 4009 return Diag(FnDecl->getLocation(), 4010 diag::err_operator_overload_needs_class_or_enum) 4011 << FnDecl->getDeclName(); 4012 } 4013 4014 // C++ [over.oper]p8: 4015 // An operator function cannot have default arguments (8.3.6), 4016 // except where explicitly stated below. 4017 // 4018 // Only the function-call operator allows default arguments 4019 // (C++ [over.call]p1). 4020 if (Op != OO_Call) { 4021 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4022 Param != FnDecl->param_end(); ++Param) { 4023 if ((*Param)->hasUnparsedDefaultArg()) 4024 return Diag((*Param)->getLocation(), 4025 diag::err_operator_overload_default_arg) 4026 << FnDecl->getDeclName(); 4027 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4028 return Diag((*Param)->getLocation(), 4029 diag::err_operator_overload_default_arg) 4030 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4031 } 4032 } 4033 4034 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4035 { false, false, false } 4036#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4037 , { Unary, Binary, MemberOnly } 4038#include "clang/Basic/OperatorKinds.def" 4039 }; 4040 4041 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4042 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4043 bool MustBeMemberOperator = OperatorUses[Op][2]; 4044 4045 // C++ [over.oper]p8: 4046 // [...] Operator functions cannot have more or fewer parameters 4047 // than the number required for the corresponding operator, as 4048 // described in the rest of this subclause. 4049 unsigned NumParams = FnDecl->getNumParams() 4050 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4051 if (Op != OO_Call && 4052 ((NumParams == 1 && !CanBeUnaryOperator) || 4053 (NumParams == 2 && !CanBeBinaryOperator) || 4054 (NumParams < 1) || (NumParams > 2))) { 4055 // We have the wrong number of parameters. 4056 unsigned ErrorKind; 4057 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4058 ErrorKind = 2; // 2 -> unary or binary. 4059 } else if (CanBeUnaryOperator) { 4060 ErrorKind = 0; // 0 -> unary 4061 } else { 4062 assert(CanBeBinaryOperator && 4063 "All non-call overloaded operators are unary or binary!"); 4064 ErrorKind = 1; // 1 -> binary 4065 } 4066 4067 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4068 << FnDecl->getDeclName() << NumParams << ErrorKind; 4069 } 4070 4071 // Overloaded operators other than operator() cannot be variadic. 4072 if (Op != OO_Call && 4073 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4074 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4075 << FnDecl->getDeclName(); 4076 } 4077 4078 // Some operators must be non-static member functions. 4079 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4080 return Diag(FnDecl->getLocation(), 4081 diag::err_operator_overload_must_be_member) 4082 << FnDecl->getDeclName(); 4083 } 4084 4085 // C++ [over.inc]p1: 4086 // The user-defined function called operator++ implements the 4087 // prefix and postfix ++ operator. If this function is a member 4088 // function with no parameters, or a non-member function with one 4089 // parameter of class or enumeration type, it defines the prefix 4090 // increment operator ++ for objects of that type. If the function 4091 // is a member function with one parameter (which shall be of type 4092 // int) or a non-member function with two parameters (the second 4093 // of which shall be of type int), it defines the postfix 4094 // increment operator ++ for objects of that type. 4095 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4096 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4097 bool ParamIsInt = false; 4098 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4099 ParamIsInt = BT->getKind() == BuiltinType::Int; 4100 4101 if (!ParamIsInt) 4102 return Diag(LastParam->getLocation(), 4103 diag::err_operator_overload_post_incdec_must_be_int) 4104 << LastParam->getType() << (Op == OO_MinusMinus); 4105 } 4106 4107 // Notify the class if it got an assignment operator. 4108 if (Op == OO_Equal) { 4109 // Would have returned earlier otherwise. 4110 assert(isa<CXXMethodDecl>(FnDecl) && 4111 "Overloaded = not member, but not filtered."); 4112 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4113 Method->getParent()->addedAssignmentOperator(Context, Method); 4114 } 4115 4116 return false; 4117} 4118 4119/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4120/// linkage specification, including the language and (if present) 4121/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4122/// the location of the language string literal, which is provided 4123/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4124/// the '{' brace. Otherwise, this linkage specification does not 4125/// have any braces. 4126Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4127 SourceLocation ExternLoc, 4128 SourceLocation LangLoc, 4129 const char *Lang, 4130 unsigned StrSize, 4131 SourceLocation LBraceLoc) { 4132 LinkageSpecDecl::LanguageIDs Language; 4133 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4134 Language = LinkageSpecDecl::lang_c; 4135 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4136 Language = LinkageSpecDecl::lang_cxx; 4137 else { 4138 Diag(LangLoc, diag::err_bad_language); 4139 return DeclPtrTy(); 4140 } 4141 4142 // FIXME: Add all the various semantics of linkage specifications 4143 4144 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4145 LangLoc, Language, 4146 LBraceLoc.isValid()); 4147 CurContext->addDecl(D); 4148 PushDeclContext(S, D); 4149 return DeclPtrTy::make(D); 4150} 4151 4152/// ActOnFinishLinkageSpecification - Completely the definition of 4153/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4154/// valid, it's the position of the closing '}' brace in a linkage 4155/// specification that uses braces. 4156Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4157 DeclPtrTy LinkageSpec, 4158 SourceLocation RBraceLoc) { 4159 if (LinkageSpec) 4160 PopDeclContext(); 4161 return LinkageSpec; 4162} 4163 4164/// \brief Perform semantic analysis for the variable declaration that 4165/// occurs within a C++ catch clause, returning the newly-created 4166/// variable. 4167VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4168 DeclaratorInfo *DInfo, 4169 IdentifierInfo *Name, 4170 SourceLocation Loc, 4171 SourceRange Range) { 4172 bool Invalid = false; 4173 4174 // Arrays and functions decay. 4175 if (ExDeclType->isArrayType()) 4176 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4177 else if (ExDeclType->isFunctionType()) 4178 ExDeclType = Context.getPointerType(ExDeclType); 4179 4180 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4181 // The exception-declaration shall not denote a pointer or reference to an 4182 // incomplete type, other than [cv] void*. 4183 // N2844 forbids rvalue references. 4184 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4185 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4186 Invalid = true; 4187 } 4188 4189 QualType BaseType = ExDeclType; 4190 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4191 unsigned DK = diag::err_catch_incomplete; 4192 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4193 BaseType = Ptr->getPointeeType(); 4194 Mode = 1; 4195 DK = diag::err_catch_incomplete_ptr; 4196 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4197 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4198 BaseType = Ref->getPointeeType(); 4199 Mode = 2; 4200 DK = diag::err_catch_incomplete_ref; 4201 } 4202 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4203 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4204 Invalid = true; 4205 4206 if (!Invalid && !ExDeclType->isDependentType() && 4207 RequireNonAbstractType(Loc, ExDeclType, 4208 diag::err_abstract_type_in_decl, 4209 AbstractVariableType)) 4210 Invalid = true; 4211 4212 // FIXME: Need to test for ability to copy-construct and destroy the 4213 // exception variable. 4214 4215 // FIXME: Need to check for abstract classes. 4216 4217 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4218 Name, ExDeclType, DInfo, VarDecl::None); 4219 4220 if (Invalid) 4221 ExDecl->setInvalidDecl(); 4222 4223 return ExDecl; 4224} 4225 4226/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4227/// handler. 4228Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4229 DeclaratorInfo *DInfo = 0; 4230 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4231 4232 bool Invalid = D.isInvalidType(); 4233 IdentifierInfo *II = D.getIdentifier(); 4234 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4235 // The scope should be freshly made just for us. There is just no way 4236 // it contains any previous declaration. 4237 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4238 if (PrevDecl->isTemplateParameter()) { 4239 // Maybe we will complain about the shadowed template parameter. 4240 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4241 } 4242 } 4243 4244 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4245 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4246 << D.getCXXScopeSpec().getRange(); 4247 Invalid = true; 4248 } 4249 4250 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4251 D.getIdentifier(), 4252 D.getIdentifierLoc(), 4253 D.getDeclSpec().getSourceRange()); 4254 4255 if (Invalid) 4256 ExDecl->setInvalidDecl(); 4257 4258 // Add the exception declaration into this scope. 4259 if (II) 4260 PushOnScopeChains(ExDecl, S); 4261 else 4262 CurContext->addDecl(ExDecl); 4263 4264 ProcessDeclAttributes(S, ExDecl, D); 4265 return DeclPtrTy::make(ExDecl); 4266} 4267 4268Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4269 ExprArg assertexpr, 4270 ExprArg assertmessageexpr) { 4271 Expr *AssertExpr = (Expr *)assertexpr.get(); 4272 StringLiteral *AssertMessage = 4273 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4274 4275 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4276 llvm::APSInt Value(32); 4277 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4278 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4279 AssertExpr->getSourceRange(); 4280 return DeclPtrTy(); 4281 } 4282 4283 if (Value == 0) { 4284 std::string str(AssertMessage->getStrData(), 4285 AssertMessage->getByteLength()); 4286 Diag(AssertLoc, diag::err_static_assert_failed) 4287 << str << AssertExpr->getSourceRange(); 4288 } 4289 } 4290 4291 assertexpr.release(); 4292 assertmessageexpr.release(); 4293 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4294 AssertExpr, AssertMessage); 4295 4296 CurContext->addDecl(Decl); 4297 return DeclPtrTy::make(Decl); 4298} 4299 4300/// Handle a friend type declaration. This works in tandem with 4301/// ActOnTag. 4302/// 4303/// Notes on friend class templates: 4304/// 4305/// We generally treat friend class declarations as if they were 4306/// declaring a class. So, for example, the elaborated type specifier 4307/// in a friend declaration is required to obey the restrictions of a 4308/// class-head (i.e. no typedefs in the scope chain), template 4309/// parameters are required to match up with simple template-ids, &c. 4310/// However, unlike when declaring a template specialization, it's 4311/// okay to refer to a template specialization without an empty 4312/// template parameter declaration, e.g. 4313/// friend class A<T>::B<unsigned>; 4314/// We permit this as a special case; if there are any template 4315/// parameters present at all, require proper matching, i.e. 4316/// template <> template <class T> friend class A<int>::B; 4317Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4318 MultiTemplateParamsArg TempParams) { 4319 SourceLocation Loc = DS.getSourceRange().getBegin(); 4320 4321 assert(DS.isFriendSpecified()); 4322 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4323 4324 // Try to convert the decl specifier to a type. This works for 4325 // friend templates because ActOnTag never produces a ClassTemplateDecl 4326 // for a TUK_Friend. 4327 Declarator TheDeclarator(DS, Declarator::MemberContext); 4328 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4329 if (TheDeclarator.isInvalidType()) 4330 return DeclPtrTy(); 4331 4332 // This is definitely an error in C++98. It's probably meant to 4333 // be forbidden in C++0x, too, but the specification is just 4334 // poorly written. 4335 // 4336 // The problem is with declarations like the following: 4337 // template <T> friend A<T>::foo; 4338 // where deciding whether a class C is a friend or not now hinges 4339 // on whether there exists an instantiation of A that causes 4340 // 'foo' to equal C. There are restrictions on class-heads 4341 // (which we declare (by fiat) elaborated friend declarations to 4342 // be) that makes this tractable. 4343 // 4344 // FIXME: handle "template <> friend class A<T>;", which 4345 // is possibly well-formed? Who even knows? 4346 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4347 Diag(Loc, diag::err_tagless_friend_type_template) 4348 << DS.getSourceRange(); 4349 return DeclPtrTy(); 4350 } 4351 4352 // C++ [class.friend]p2: 4353 // An elaborated-type-specifier shall be used in a friend declaration 4354 // for a class.* 4355 // * The class-key of the elaborated-type-specifier is required. 4356 // This is one of the rare places in Clang where it's legitimate to 4357 // ask about the "spelling" of the type. 4358 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4359 // If we evaluated the type to a record type, suggest putting 4360 // a tag in front. 4361 if (const RecordType *RT = T->getAs<RecordType>()) { 4362 RecordDecl *RD = RT->getDecl(); 4363 4364 std::string InsertionText = std::string(" ") + RD->getKindName(); 4365 4366 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4367 << (unsigned) RD->getTagKind() 4368 << T 4369 << SourceRange(DS.getFriendSpecLoc()) 4370 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4371 InsertionText); 4372 return DeclPtrTy(); 4373 }else { 4374 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4375 << DS.getSourceRange(); 4376 return DeclPtrTy(); 4377 } 4378 } 4379 4380 // Enum types cannot be friends. 4381 if (T->getAs<EnumType>()) { 4382 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4383 << SourceRange(DS.getFriendSpecLoc()); 4384 return DeclPtrTy(); 4385 } 4386 4387 // C++98 [class.friend]p1: A friend of a class is a function 4388 // or class that is not a member of the class . . . 4389 // But that's a silly restriction which nobody implements for 4390 // inner classes, and C++0x removes it anyway, so we only report 4391 // this (as a warning) if we're being pedantic. 4392 if (!getLangOptions().CPlusPlus0x) 4393 if (const RecordType *RT = T->getAs<RecordType>()) 4394 if (RT->getDecl()->getDeclContext() == CurContext) 4395 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4396 4397 Decl *D; 4398 if (TempParams.size()) 4399 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4400 TempParams.size(), 4401 (TemplateParameterList**) TempParams.release(), 4402 T.getTypePtr(), 4403 DS.getFriendSpecLoc()); 4404 else 4405 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4406 DS.getFriendSpecLoc()); 4407 D->setAccess(AS_public); 4408 CurContext->addDecl(D); 4409 4410 return DeclPtrTy::make(D); 4411} 4412 4413Sema::DeclPtrTy 4414Sema::ActOnFriendFunctionDecl(Scope *S, 4415 Declarator &D, 4416 bool IsDefinition, 4417 MultiTemplateParamsArg TemplateParams) { 4418 const DeclSpec &DS = D.getDeclSpec(); 4419 4420 assert(DS.isFriendSpecified()); 4421 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4422 4423 SourceLocation Loc = D.getIdentifierLoc(); 4424 DeclaratorInfo *DInfo = 0; 4425 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4426 4427 // C++ [class.friend]p1 4428 // A friend of a class is a function or class.... 4429 // Note that this sees through typedefs, which is intended. 4430 // It *doesn't* see through dependent types, which is correct 4431 // according to [temp.arg.type]p3: 4432 // If a declaration acquires a function type through a 4433 // type dependent on a template-parameter and this causes 4434 // a declaration that does not use the syntactic form of a 4435 // function declarator to have a function type, the program 4436 // is ill-formed. 4437 if (!T->isFunctionType()) { 4438 Diag(Loc, diag::err_unexpected_friend); 4439 4440 // It might be worthwhile to try to recover by creating an 4441 // appropriate declaration. 4442 return DeclPtrTy(); 4443 } 4444 4445 // C++ [namespace.memdef]p3 4446 // - If a friend declaration in a non-local class first declares a 4447 // class or function, the friend class or function is a member 4448 // of the innermost enclosing namespace. 4449 // - The name of the friend is not found by simple name lookup 4450 // until a matching declaration is provided in that namespace 4451 // scope (either before or after the class declaration granting 4452 // friendship). 4453 // - If a friend function is called, its name may be found by the 4454 // name lookup that considers functions from namespaces and 4455 // classes associated with the types of the function arguments. 4456 // - When looking for a prior declaration of a class or a function 4457 // declared as a friend, scopes outside the innermost enclosing 4458 // namespace scope are not considered. 4459 4460 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4461 DeclarationName Name = GetNameForDeclarator(D); 4462 assert(Name); 4463 4464 // The context we found the declaration in, or in which we should 4465 // create the declaration. 4466 DeclContext *DC; 4467 4468 // FIXME: handle local classes 4469 4470 // Recover from invalid scope qualifiers as if they just weren't there. 4471 NamedDecl *PrevDecl = 0; 4472 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4473 // FIXME: RequireCompleteDeclContext 4474 DC = computeDeclContext(ScopeQual); 4475 4476 // FIXME: handle dependent contexts 4477 if (!DC) return DeclPtrTy(); 4478 4479 LookupResult R; 4480 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4481 PrevDecl = R.getAsSingleDecl(Context); 4482 4483 // If searching in that context implicitly found a declaration in 4484 // a different context, treat it like it wasn't found at all. 4485 // TODO: better diagnostics for this case. Suggesting the right 4486 // qualified scope would be nice... 4487 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4488 D.setInvalidType(); 4489 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4490 return DeclPtrTy(); 4491 } 4492 4493 // C++ [class.friend]p1: A friend of a class is a function or 4494 // class that is not a member of the class . . . 4495 if (DC->Equals(CurContext)) 4496 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4497 4498 // Otherwise walk out to the nearest namespace scope looking for matches. 4499 } else { 4500 // TODO: handle local class contexts. 4501 4502 DC = CurContext; 4503 while (true) { 4504 // Skip class contexts. If someone can cite chapter and verse 4505 // for this behavior, that would be nice --- it's what GCC and 4506 // EDG do, and it seems like a reasonable intent, but the spec 4507 // really only says that checks for unqualified existing 4508 // declarations should stop at the nearest enclosing namespace, 4509 // not that they should only consider the nearest enclosing 4510 // namespace. 4511 while (DC->isRecord()) 4512 DC = DC->getParent(); 4513 4514 LookupResult R; 4515 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4516 PrevDecl = R.getAsSingleDecl(Context); 4517 4518 // TODO: decide what we think about using declarations. 4519 if (PrevDecl) 4520 break; 4521 4522 if (DC->isFileContext()) break; 4523 DC = DC->getParent(); 4524 } 4525 4526 // C++ [class.friend]p1: A friend of a class is a function or 4527 // class that is not a member of the class . . . 4528 // C++0x changes this for both friend types and functions. 4529 // Most C++ 98 compilers do seem to give an error here, so 4530 // we do, too. 4531 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4532 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4533 } 4534 4535 if (DC->isFileContext()) { 4536 // This implies that it has to be an operator or function. 4537 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4538 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4539 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4540 Diag(Loc, diag::err_introducing_special_friend) << 4541 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4542 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4543 return DeclPtrTy(); 4544 } 4545 } 4546 4547 bool Redeclaration = false; 4548 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4549 move(TemplateParams), 4550 IsDefinition, 4551 Redeclaration); 4552 if (!ND) return DeclPtrTy(); 4553 4554 assert(ND->getDeclContext() == DC); 4555 assert(ND->getLexicalDeclContext() == CurContext); 4556 4557 // Add the function declaration to the appropriate lookup tables, 4558 // adjusting the redeclarations list as necessary. We don't 4559 // want to do this yet if the friending class is dependent. 4560 // 4561 // Also update the scope-based lookup if the target context's 4562 // lookup context is in lexical scope. 4563 if (!CurContext->isDependentContext()) { 4564 DC = DC->getLookupContext(); 4565 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4566 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4567 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4568 } 4569 4570 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4571 D.getIdentifierLoc(), ND, 4572 DS.getFriendSpecLoc()); 4573 FrD->setAccess(AS_public); 4574 CurContext->addDecl(FrD); 4575 4576 return DeclPtrTy::make(ND); 4577} 4578 4579void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4580 AdjustDeclIfTemplate(dcl); 4581 4582 Decl *Dcl = dcl.getAs<Decl>(); 4583 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4584 if (!Fn) { 4585 Diag(DelLoc, diag::err_deleted_non_function); 4586 return; 4587 } 4588 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4589 Diag(DelLoc, diag::err_deleted_decl_not_first); 4590 Diag(Prev->getLocation(), diag::note_previous_declaration); 4591 // If the declaration wasn't the first, we delete the function anyway for 4592 // recovery. 4593 } 4594 Fn->setDeleted(); 4595} 4596 4597static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4598 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4599 ++CI) { 4600 Stmt *SubStmt = *CI; 4601 if (!SubStmt) 4602 continue; 4603 if (isa<ReturnStmt>(SubStmt)) 4604 Self.Diag(SubStmt->getSourceRange().getBegin(), 4605 diag::err_return_in_constructor_handler); 4606 if (!isa<Expr>(SubStmt)) 4607 SearchForReturnInStmt(Self, SubStmt); 4608 } 4609} 4610 4611void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4612 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4613 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4614 SearchForReturnInStmt(*this, Handler); 4615 } 4616} 4617 4618bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4619 const CXXMethodDecl *Old) { 4620 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4621 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4622 4623 QualType CNewTy = Context.getCanonicalType(NewTy); 4624 QualType COldTy = Context.getCanonicalType(OldTy); 4625 4626 if (CNewTy == COldTy && 4627 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 4628 return false; 4629 4630 // Check if the return types are covariant 4631 QualType NewClassTy, OldClassTy; 4632 4633 /// Both types must be pointers or references to classes. 4634 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4635 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4636 NewClassTy = NewPT->getPointeeType(); 4637 OldClassTy = OldPT->getPointeeType(); 4638 } 4639 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4640 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4641 NewClassTy = NewRT->getPointeeType(); 4642 OldClassTy = OldRT->getPointeeType(); 4643 } 4644 } 4645 4646 // The return types aren't either both pointers or references to a class type. 4647 if (NewClassTy.isNull()) { 4648 Diag(New->getLocation(), 4649 diag::err_different_return_type_for_overriding_virtual_function) 4650 << New->getDeclName() << NewTy << OldTy; 4651 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4652 4653 return true; 4654 } 4655 4656 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 4657 // Check if the new class derives from the old class. 4658 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4659 Diag(New->getLocation(), 4660 diag::err_covariant_return_not_derived) 4661 << New->getDeclName() << NewTy << OldTy; 4662 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4663 return true; 4664 } 4665 4666 // Check if we the conversion from derived to base is valid. 4667 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4668 diag::err_covariant_return_inaccessible_base, 4669 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4670 // FIXME: Should this point to the return type? 4671 New->getLocation(), SourceRange(), New->getDeclName())) { 4672 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4673 return true; 4674 } 4675 } 4676 4677 // The qualifiers of the return types must be the same. 4678 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 4679 Diag(New->getLocation(), 4680 diag::err_covariant_return_type_different_qualifications) 4681 << New->getDeclName() << NewTy << OldTy; 4682 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4683 return true; 4684 }; 4685 4686 4687 // The new class type must have the same or less qualifiers as the old type. 4688 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4689 Diag(New->getLocation(), 4690 diag::err_covariant_return_type_class_type_more_qualified) 4691 << New->getDeclName() << NewTy << OldTy; 4692 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4693 return true; 4694 }; 4695 4696 return false; 4697} 4698 4699/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4700/// initializer for the declaration 'Dcl'. 4701/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4702/// static data member of class X, names should be looked up in the scope of 4703/// class X. 4704void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4705 AdjustDeclIfTemplate(Dcl); 4706 4707 Decl *D = Dcl.getAs<Decl>(); 4708 // If there is no declaration, there was an error parsing it. 4709 if (D == 0) 4710 return; 4711 4712 // Check whether it is a declaration with a nested name specifier like 4713 // int foo::bar; 4714 if (!D->isOutOfLine()) 4715 return; 4716 4717 // C++ [basic.lookup.unqual]p13 4718 // 4719 // A name used in the definition of a static data member of class X 4720 // (after the qualified-id of the static member) is looked up as if the name 4721 // was used in a member function of X. 4722 4723 // Change current context into the context of the initializing declaration. 4724 EnterDeclaratorContext(S, D->getDeclContext()); 4725} 4726 4727/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4728/// initializer for the declaration 'Dcl'. 4729void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4730 AdjustDeclIfTemplate(Dcl); 4731 4732 Decl *D = Dcl.getAs<Decl>(); 4733 // If there is no declaration, there was an error parsing it. 4734 if (D == 0) 4735 return; 4736 4737 // Check whether it is a declaration with a nested name specifier like 4738 // int foo::bar; 4739 if (!D->isOutOfLine()) 4740 return; 4741 4742 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4743 ExitDeclaratorContext(S); 4744} 4745