SemaDeclCXX.cpp revision c07a494b376f75f33759cf09ad188b11ef3fa9d5
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/Parse/DeclSpec.h" 22#include "clang/Parse/Template.h" 23#include "clang/Basic/PartialDiagnostic.h" 24#include "clang/Lex/Preprocessor.h" 25#include "llvm/ADT/STLExtras.h" 26#include "llvm/Support/Compiler.h" 27#include <algorithm> // for std::equal 28#include <map> 29#include <set> 30 31using namespace clang; 32 33//===----------------------------------------------------------------------===// 34// CheckDefaultArgumentVisitor 35//===----------------------------------------------------------------------===// 36 37namespace { 38 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 39 /// the default argument of a parameter to determine whether it 40 /// contains any ill-formed subexpressions. For example, this will 41 /// diagnose the use of local variables or parameters within the 42 /// default argument expression. 43 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 44 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 45 Expr *DefaultArg; 46 Sema *S; 47 48 public: 49 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 50 : DefaultArg(defarg), S(s) {} 51 52 bool VisitExpr(Expr *Node); 53 bool VisitDeclRefExpr(DeclRefExpr *DRE); 54 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 55 }; 56 57 /// VisitExpr - Visit all of the children of this expression. 58 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 59 bool IsInvalid = false; 60 for (Stmt::child_iterator I = Node->child_begin(), 61 E = Node->child_end(); I != E; ++I) 62 IsInvalid |= Visit(*I); 63 return IsInvalid; 64 } 65 66 /// VisitDeclRefExpr - Visit a reference to a declaration, to 67 /// determine whether this declaration can be used in the default 68 /// argument expression. 69 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 70 NamedDecl *Decl = DRE->getDecl(); 71 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 72 // C++ [dcl.fct.default]p9 73 // Default arguments are evaluated each time the function is 74 // called. The order of evaluation of function arguments is 75 // unspecified. Consequently, parameters of a function shall not 76 // be used in default argument expressions, even if they are not 77 // evaluated. Parameters of a function declared before a default 78 // argument expression are in scope and can hide namespace and 79 // class member names. 80 return S->Diag(DRE->getSourceRange().getBegin(), 81 diag::err_param_default_argument_references_param) 82 << Param->getDeclName() << DefaultArg->getSourceRange(); 83 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p7 85 // Local variables shall not be used in default argument 86 // expressions. 87 if (VDecl->isBlockVarDecl()) 88 return S->Diag(DRE->getSourceRange().getBegin(), 89 diag::err_param_default_argument_references_local) 90 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 91 } 92 93 return false; 94 } 95 96 /// VisitCXXThisExpr - Visit a C++ "this" expression. 97 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 98 // C++ [dcl.fct.default]p8: 99 // The keyword this shall not be used in a default argument of a 100 // member function. 101 return S->Diag(ThisE->getSourceRange().getBegin(), 102 diag::err_param_default_argument_references_this) 103 << ThisE->getSourceRange(); 104 } 105} 106 107bool 108Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 109 SourceLocation EqualLoc) { 110 QualType ParamType = Param->getType(); 111 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 127 Param->getDeclName(), /*DirectInit=*/false)) 128 return true; 129 130 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 131 132 // Okay: add the default argument to the parameter 133 Param->setDefaultArg(Arg); 134 135 DefaultArg.release(); 136 137 return false; 138} 139 140/// ActOnParamDefaultArgument - Check whether the default argument 141/// provided for a function parameter is well-formed. If so, attach it 142/// to the parameter declaration. 143void 144Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 145 ExprArg defarg) { 146 if (!param || !defarg.get()) 147 return; 148 149 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 150 UnparsedDefaultArgLocs.erase(Param); 151 152 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 153 QualType ParamType = Param->getType(); 154 155 // Default arguments are only permitted in C++ 156 if (!getLangOptions().CPlusPlus) { 157 Diag(EqualLoc, diag::err_param_default_argument) 158 << DefaultArg->getSourceRange(); 159 Param->setInvalidDecl(); 160 return; 161 } 162 163 // Check that the default argument is well-formed 164 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 165 if (DefaultArgChecker.Visit(DefaultArg.get())) { 166 Param->setInvalidDecl(); 167 return; 168 } 169 170 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 171} 172 173/// ActOnParamUnparsedDefaultArgument - We've seen a default 174/// argument for a function parameter, but we can't parse it yet 175/// because we're inside a class definition. Note that this default 176/// argument will be parsed later. 177void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 178 SourceLocation EqualLoc, 179 SourceLocation ArgLoc) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 if (Param) 185 Param->setUnparsedDefaultArg(); 186 187 UnparsedDefaultArgLocs[Param] = ArgLoc; 188} 189 190/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 191/// the default argument for the parameter param failed. 192void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 193 if (!param) 194 return; 195 196 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 197 198 Param->setInvalidDecl(); 199 200 UnparsedDefaultArgLocs.erase(Param); 201} 202 203/// CheckExtraCXXDefaultArguments - Check for any extra default 204/// arguments in the declarator, which is not a function declaration 205/// or definition and therefore is not permitted to have default 206/// arguments. This routine should be invoked for every declarator 207/// that is not a function declaration or definition. 208void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 209 // C++ [dcl.fct.default]p3 210 // A default argument expression shall be specified only in the 211 // parameter-declaration-clause of a function declaration or in a 212 // template-parameter (14.1). It shall not be specified for a 213 // parameter pack. If it is specified in a 214 // parameter-declaration-clause, it shall not occur within a 215 // declarator or abstract-declarator of a parameter-declaration. 216 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 217 DeclaratorChunk &chunk = D.getTypeObject(i); 218 if (chunk.Kind == DeclaratorChunk::Function) { 219 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 220 ParmVarDecl *Param = 221 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 222 if (Param->hasUnparsedDefaultArg()) { 223 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 224 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 225 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 226 delete Toks; 227 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 228 } else if (Param->getDefaultArg()) { 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << Param->getDefaultArg()->getSourceRange(); 231 Param->setDefaultArg(0); 232 } 233 } 234 } 235 } 236} 237 238// MergeCXXFunctionDecl - Merge two declarations of the same C++ 239// function, once we already know that they have the same 240// type. Subroutine of MergeFunctionDecl. Returns true if there was an 241// error, false otherwise. 242bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 243 bool Invalid = false; 244 245 // C++ [dcl.fct.default]p4: 246 // For non-template functions, default arguments can be added in 247 // later declarations of a function in the same 248 // scope. Declarations in different scopes have completely 249 // distinct sets of default arguments. That is, declarations in 250 // inner scopes do not acquire default arguments from 251 // declarations in outer scopes, and vice versa. In a given 252 // function declaration, all parameters subsequent to a 253 // parameter with a default argument shall have default 254 // arguments supplied in this or previous declarations. A 255 // default argument shall not be redefined by a later 256 // declaration (not even to the same value). 257 // 258 // C++ [dcl.fct.default]p6: 259 // Except for member functions of class templates, the default arguments 260 // in a member function definition that appears outside of the class 261 // definition are added to the set of default arguments provided by the 262 // member function declaration in the class definition. 263 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 264 ParmVarDecl *OldParam = Old->getParamDecl(p); 265 ParmVarDecl *NewParam = New->getParamDecl(p); 266 267 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 268 // FIXME: If the parameter doesn't have an identifier then the location 269 // points to the '=' which means that the fixit hint won't remove any 270 // extra spaces between the type and the '='. 271 SourceLocation Begin = NewParam->getLocation(); 272 if (NewParam->getIdentifier()) 273 Begin = PP.getLocForEndOfToken(Begin); 274 275 Diag(NewParam->getLocation(), 276 diag::err_param_default_argument_redefinition) 277 << NewParam->getDefaultArgRange() 278 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 279 NewParam->getLocEnd())); 280 281 // Look for the function declaration where the default argument was 282 // actually written, which may be a declaration prior to Old. 283 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 284 Older; Older = Older->getPreviousDeclaration()) { 285 if (!Older->getParamDecl(p)->hasDefaultArg()) 286 break; 287 288 OldParam = Older->getParamDecl(p); 289 } 290 291 Diag(OldParam->getLocation(), diag::note_previous_definition) 292 << OldParam->getDefaultArgRange(); 293 Invalid = true; 294 } else if (OldParam->hasDefaultArg()) { 295 // Merge the old default argument into the new parameter 296 if (OldParam->hasUninstantiatedDefaultArg()) 297 NewParam->setUninstantiatedDefaultArg( 298 OldParam->getUninstantiatedDefaultArg()); 299 else 300 NewParam->setDefaultArg(OldParam->getDefaultArg()); 301 } else if (NewParam->hasDefaultArg()) { 302 if (New->getDescribedFunctionTemplate()) { 303 // Paragraph 4, quoted above, only applies to non-template functions. 304 Diag(NewParam->getLocation(), 305 diag::err_param_default_argument_template_redecl) 306 << NewParam->getDefaultArgRange(); 307 Diag(Old->getLocation(), diag::note_template_prev_declaration) 308 << false; 309 } else if (New->getTemplateSpecializationKind() 310 != TSK_ImplicitInstantiation && 311 New->getTemplateSpecializationKind() != TSK_Undeclared) { 312 // C++ [temp.expr.spec]p21: 313 // Default function arguments shall not be specified in a declaration 314 // or a definition for one of the following explicit specializations: 315 // - the explicit specialization of a function template; 316 // - the explicit specialization of a member function template; 317 // - the explicit specialization of a member function of a class 318 // template where the class template specialization to which the 319 // member function specialization belongs is implicitly 320 // instantiated. 321 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 322 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 323 << New->getDeclName() 324 << NewParam->getDefaultArgRange(); 325 } else if (New->getDeclContext()->isDependentContext()) { 326 // C++ [dcl.fct.default]p6 (DR217): 327 // Default arguments for a member function of a class template shall 328 // be specified on the initial declaration of the member function 329 // within the class template. 330 // 331 // Reading the tea leaves a bit in DR217 and its reference to DR205 332 // leads me to the conclusion that one cannot add default function 333 // arguments for an out-of-line definition of a member function of a 334 // dependent type. 335 int WhichKind = 2; 336 if (CXXRecordDecl *Record 337 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 338 if (Record->getDescribedClassTemplate()) 339 WhichKind = 0; 340 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 341 WhichKind = 1; 342 else 343 WhichKind = 2; 344 } 345 346 Diag(NewParam->getLocation(), 347 diag::err_param_default_argument_member_template_redecl) 348 << WhichKind 349 << NewParam->getDefaultArgRange(); 350 } 351 } 352 } 353 354 if (CheckEquivalentExceptionSpec( 355 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 356 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) { 357 Invalid = true; 358 } 359 360 return Invalid; 361} 362 363/// CheckCXXDefaultArguments - Verify that the default arguments for a 364/// function declaration are well-formed according to C++ 365/// [dcl.fct.default]. 366void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 367 unsigned NumParams = FD->getNumParams(); 368 unsigned p; 369 370 // Find first parameter with a default argument 371 for (p = 0; p < NumParams; ++p) { 372 ParmVarDecl *Param = FD->getParamDecl(p); 373 if (Param->hasDefaultArg()) 374 break; 375 } 376 377 // C++ [dcl.fct.default]p4: 378 // In a given function declaration, all parameters 379 // subsequent to a parameter with a default argument shall 380 // have default arguments supplied in this or previous 381 // declarations. A default argument shall not be redefined 382 // by a later declaration (not even to the same value). 383 unsigned LastMissingDefaultArg = 0; 384 for (; p < NumParams; ++p) { 385 ParmVarDecl *Param = FD->getParamDecl(p); 386 if (!Param->hasDefaultArg()) { 387 if (Param->isInvalidDecl()) 388 /* We already complained about this parameter. */; 389 else if (Param->getIdentifier()) 390 Diag(Param->getLocation(), 391 diag::err_param_default_argument_missing_name) 392 << Param->getIdentifier(); 393 else 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing); 396 397 LastMissingDefaultArg = p; 398 } 399 } 400 401 if (LastMissingDefaultArg > 0) { 402 // Some default arguments were missing. Clear out all of the 403 // default arguments up to (and including) the last missing 404 // default argument, so that we leave the function parameters 405 // in a semantically valid state. 406 for (p = 0; p <= LastMissingDefaultArg; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (Param->hasDefaultArg()) { 409 if (!Param->hasUnparsedDefaultArg()) 410 Param->getDefaultArg()->Destroy(Context); 411 Param->setDefaultArg(0); 412 } 413 } 414 } 415} 416 417/// isCurrentClassName - Determine whether the identifier II is the 418/// name of the class type currently being defined. In the case of 419/// nested classes, this will only return true if II is the name of 420/// the innermost class. 421bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 422 const CXXScopeSpec *SS) { 423 CXXRecordDecl *CurDecl; 424 if (SS && SS->isSet() && !SS->isInvalid()) { 425 DeclContext *DC = computeDeclContext(*SS, true); 426 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 427 } else 428 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 429 430 if (CurDecl) 431 return &II == CurDecl->getIdentifier(); 432 else 433 return false; 434} 435 436/// \brief Check the validity of a C++ base class specifier. 437/// 438/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 439/// and returns NULL otherwise. 440CXXBaseSpecifier * 441Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 442 SourceRange SpecifierRange, 443 bool Virtual, AccessSpecifier Access, 444 QualType BaseType, 445 SourceLocation BaseLoc) { 446 // C++ [class.union]p1: 447 // A union shall not have base classes. 448 if (Class->isUnion()) { 449 Diag(Class->getLocation(), diag::err_base_clause_on_union) 450 << SpecifierRange; 451 return 0; 452 } 453 454 if (BaseType->isDependentType()) 455 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 456 Class->getTagKind() == RecordDecl::TK_class, 457 Access, BaseType); 458 459 // Base specifiers must be record types. 460 if (!BaseType->isRecordType()) { 461 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 462 return 0; 463 } 464 465 // C++ [class.union]p1: 466 // A union shall not be used as a base class. 467 if (BaseType->isUnionType()) { 468 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.derived]p2: 473 // The class-name in a base-specifier shall not be an incompletely 474 // defined class. 475 if (RequireCompleteType(BaseLoc, BaseType, 476 PDiag(diag::err_incomplete_base_class) 477 << SpecifierRange)) 478 return 0; 479 480 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 481 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 482 assert(BaseDecl && "Record type has no declaration"); 483 BaseDecl = BaseDecl->getDefinition(Context); 484 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 485 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 486 assert(CXXBaseDecl && "Base type is not a C++ type"); 487 if (!CXXBaseDecl->isEmpty()) 488 Class->setEmpty(false); 489 if (CXXBaseDecl->isPolymorphic()) 490 Class->setPolymorphic(true); 491 492 // C++ [dcl.init.aggr]p1: 493 // An aggregate is [...] a class with [...] no base classes [...]. 494 Class->setAggregate(false); 495 Class->setPOD(false); 496 497 if (Virtual) { 498 // C++ [class.ctor]p5: 499 // A constructor is trivial if its class has no virtual base classes. 500 Class->setHasTrivialConstructor(false); 501 502 // C++ [class.copy]p6: 503 // A copy constructor is trivial if its class has no virtual base classes. 504 Class->setHasTrivialCopyConstructor(false); 505 506 // C++ [class.copy]p11: 507 // A copy assignment operator is trivial if its class has no virtual 508 // base classes. 509 Class->setHasTrivialCopyAssignment(false); 510 511 // C++0x [meta.unary.prop] is_empty: 512 // T is a class type, but not a union type, with ... no virtual base 513 // classes 514 Class->setEmpty(false); 515 } else { 516 // C++ [class.ctor]p5: 517 // A constructor is trivial if all the direct base classes of its 518 // class have trivial constructors. 519 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 520 Class->setHasTrivialConstructor(false); 521 522 // C++ [class.copy]p6: 523 // A copy constructor is trivial if all the direct base classes of its 524 // class have trivial copy constructors. 525 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 526 Class->setHasTrivialCopyConstructor(false); 527 528 // C++ [class.copy]p11: 529 // A copy assignment operator is trivial if all the direct base classes 530 // of its class have trivial copy assignment operators. 531 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 532 Class->setHasTrivialCopyAssignment(false); 533 } 534 535 // C++ [class.ctor]p3: 536 // A destructor is trivial if all the direct base classes of its class 537 // have trivial destructors. 538 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 539 Class->setHasTrivialDestructor(false); 540 541 // Create the base specifier. 542 // FIXME: Allocate via ASTContext? 543 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 544 Class->getTagKind() == RecordDecl::TK_class, 545 Access, BaseType); 546} 547 548/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 549/// one entry in the base class list of a class specifier, for 550/// example: 551/// class foo : public bar, virtual private baz { 552/// 'public bar' and 'virtual private baz' are each base-specifiers. 553Sema::BaseResult 554Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 555 bool Virtual, AccessSpecifier Access, 556 TypeTy *basetype, SourceLocation BaseLoc) { 557 if (!classdecl) 558 return true; 559 560 AdjustDeclIfTemplate(classdecl); 561 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 562 QualType BaseType = GetTypeFromParser(basetype); 563 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 564 Virtual, Access, 565 BaseType, BaseLoc)) 566 return BaseSpec; 567 568 return true; 569} 570 571/// \brief Performs the actual work of attaching the given base class 572/// specifiers to a C++ class. 573bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 574 unsigned NumBases) { 575 if (NumBases == 0) 576 return false; 577 578 // Used to keep track of which base types we have already seen, so 579 // that we can properly diagnose redundant direct base types. Note 580 // that the key is always the unqualified canonical type of the base 581 // class. 582 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 583 584 // Copy non-redundant base specifiers into permanent storage. 585 unsigned NumGoodBases = 0; 586 bool Invalid = false; 587 for (unsigned idx = 0; idx < NumBases; ++idx) { 588 QualType NewBaseType 589 = Context.getCanonicalType(Bases[idx]->getType()); 590 NewBaseType = NewBaseType.getUnqualifiedType(); 591 592 if (KnownBaseTypes[NewBaseType]) { 593 // C++ [class.mi]p3: 594 // A class shall not be specified as a direct base class of a 595 // derived class more than once. 596 Diag(Bases[idx]->getSourceRange().getBegin(), 597 diag::err_duplicate_base_class) 598 << KnownBaseTypes[NewBaseType]->getType() 599 << Bases[idx]->getSourceRange(); 600 601 // Delete the duplicate base class specifier; we're going to 602 // overwrite its pointer later. 603 Context.Deallocate(Bases[idx]); 604 605 Invalid = true; 606 } else { 607 // Okay, add this new base class. 608 KnownBaseTypes[NewBaseType] = Bases[idx]; 609 Bases[NumGoodBases++] = Bases[idx]; 610 } 611 } 612 613 // Attach the remaining base class specifiers to the derived class. 614 Class->setBases(Context, Bases, NumGoodBases); 615 616 // Delete the remaining (good) base class specifiers, since their 617 // data has been copied into the CXXRecordDecl. 618 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 619 Context.Deallocate(Bases[idx]); 620 621 return Invalid; 622} 623 624/// ActOnBaseSpecifiers - Attach the given base specifiers to the 625/// class, after checking whether there are any duplicate base 626/// classes. 627void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 628 unsigned NumBases) { 629 if (!ClassDecl || !Bases || !NumBases) 630 return; 631 632 AdjustDeclIfTemplate(ClassDecl); 633 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 634 (CXXBaseSpecifier**)(Bases), NumBases); 635} 636 637/// \brief Determine whether the type \p Derived is a C++ class that is 638/// derived from the type \p Base. 639bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 640 if (!getLangOptions().CPlusPlus) 641 return false; 642 643 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 644 if (!DerivedRT) 645 return false; 646 647 const RecordType *BaseRT = Base->getAs<RecordType>(); 648 if (!BaseRT) 649 return false; 650 651 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 652 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 653 return DerivedRD->isDerivedFrom(BaseRD); 654} 655 656/// \brief Determine whether the type \p Derived is a C++ class that is 657/// derived from the type \p Base. 658bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 659 if (!getLangOptions().CPlusPlus) 660 return false; 661 662 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 663 if (!DerivedRT) 664 return false; 665 666 const RecordType *BaseRT = Base->getAs<RecordType>(); 667 if (!BaseRT) 668 return false; 669 670 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 671 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 672 return DerivedRD->isDerivedFrom(BaseRD, Paths); 673} 674 675/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 676/// conversion (where Derived and Base are class types) is 677/// well-formed, meaning that the conversion is unambiguous (and 678/// that all of the base classes are accessible). Returns true 679/// and emits a diagnostic if the code is ill-formed, returns false 680/// otherwise. Loc is the location where this routine should point to 681/// if there is an error, and Range is the source range to highlight 682/// if there is an error. 683bool 684Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 685 unsigned InaccessibleBaseID, 686 unsigned AmbigiousBaseConvID, 687 SourceLocation Loc, SourceRange Range, 688 DeclarationName Name) { 689 // First, determine whether the path from Derived to Base is 690 // ambiguous. This is slightly more expensive than checking whether 691 // the Derived to Base conversion exists, because here we need to 692 // explore multiple paths to determine if there is an ambiguity. 693 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 694 /*DetectVirtual=*/false); 695 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 696 assert(DerivationOkay && 697 "Can only be used with a derived-to-base conversion"); 698 (void)DerivationOkay; 699 700 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 701 if (InaccessibleBaseID == 0) 702 return false; 703 // Check that the base class can be accessed. 704 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 705 Name); 706 } 707 708 // We know that the derived-to-base conversion is ambiguous, and 709 // we're going to produce a diagnostic. Perform the derived-to-base 710 // search just one more time to compute all of the possible paths so 711 // that we can print them out. This is more expensive than any of 712 // the previous derived-to-base checks we've done, but at this point 713 // performance isn't as much of an issue. 714 Paths.clear(); 715 Paths.setRecordingPaths(true); 716 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 717 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 718 (void)StillOkay; 719 720 // Build up a textual representation of the ambiguous paths, e.g., 721 // D -> B -> A, that will be used to illustrate the ambiguous 722 // conversions in the diagnostic. We only print one of the paths 723 // to each base class subobject. 724 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 725 726 Diag(Loc, AmbigiousBaseConvID) 727 << Derived << Base << PathDisplayStr << Range << Name; 728 return true; 729} 730 731bool 732Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 733 SourceLocation Loc, SourceRange Range, 734 bool IgnoreAccess) { 735 return CheckDerivedToBaseConversion(Derived, Base, 736 IgnoreAccess ? 0 : 737 diag::err_conv_to_inaccessible_base, 738 diag::err_ambiguous_derived_to_base_conv, 739 Loc, Range, DeclarationName()); 740} 741 742 743/// @brief Builds a string representing ambiguous paths from a 744/// specific derived class to different subobjects of the same base 745/// class. 746/// 747/// This function builds a string that can be used in error messages 748/// to show the different paths that one can take through the 749/// inheritance hierarchy to go from the derived class to different 750/// subobjects of a base class. The result looks something like this: 751/// @code 752/// struct D -> struct B -> struct A 753/// struct D -> struct C -> struct A 754/// @endcode 755std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 756 std::string PathDisplayStr; 757 std::set<unsigned> DisplayedPaths; 758 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 759 Path != Paths.end(); ++Path) { 760 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 761 // We haven't displayed a path to this particular base 762 // class subobject yet. 763 PathDisplayStr += "\n "; 764 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 765 for (CXXBasePath::const_iterator Element = Path->begin(); 766 Element != Path->end(); ++Element) 767 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 768 } 769 } 770 771 return PathDisplayStr; 772} 773 774//===----------------------------------------------------------------------===// 775// C++ class member Handling 776//===----------------------------------------------------------------------===// 777 778/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 779/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 780/// bitfield width if there is one and 'InitExpr' specifies the initializer if 781/// any. 782Sema::DeclPtrTy 783Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 784 MultiTemplateParamsArg TemplateParameterLists, 785 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 786 const DeclSpec &DS = D.getDeclSpec(); 787 DeclarationName Name = GetNameForDeclarator(D); 788 Expr *BitWidth = static_cast<Expr*>(BW); 789 Expr *Init = static_cast<Expr*>(InitExpr); 790 SourceLocation Loc = D.getIdentifierLoc(); 791 792 bool isFunc = D.isFunctionDeclarator(); 793 794 assert(!DS.isFriendSpecified()); 795 796 // C++ 9.2p6: A member shall not be declared to have automatic storage 797 // duration (auto, register) or with the extern storage-class-specifier. 798 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 799 // data members and cannot be applied to names declared const or static, 800 // and cannot be applied to reference members. 801 switch (DS.getStorageClassSpec()) { 802 case DeclSpec::SCS_unspecified: 803 case DeclSpec::SCS_typedef: 804 case DeclSpec::SCS_static: 805 // FALL THROUGH. 806 break; 807 case DeclSpec::SCS_mutable: 808 if (isFunc) { 809 if (DS.getStorageClassSpecLoc().isValid()) 810 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 811 else 812 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 813 814 // FIXME: It would be nicer if the keyword was ignored only for this 815 // declarator. Otherwise we could get follow-up errors. 816 D.getMutableDeclSpec().ClearStorageClassSpecs(); 817 } else { 818 QualType T = GetTypeForDeclarator(D, S); 819 diag::kind err = static_cast<diag::kind>(0); 820 if (T->isReferenceType()) 821 err = diag::err_mutable_reference; 822 else if (T.isConstQualified()) 823 err = diag::err_mutable_const; 824 if (err != 0) { 825 if (DS.getStorageClassSpecLoc().isValid()) 826 Diag(DS.getStorageClassSpecLoc(), err); 827 else 828 Diag(DS.getThreadSpecLoc(), err); 829 // FIXME: It would be nicer if the keyword was ignored only for this 830 // declarator. Otherwise we could get follow-up errors. 831 D.getMutableDeclSpec().ClearStorageClassSpecs(); 832 } 833 } 834 break; 835 default: 836 if (DS.getStorageClassSpecLoc().isValid()) 837 Diag(DS.getStorageClassSpecLoc(), 838 diag::err_storageclass_invalid_for_member); 839 else 840 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 841 D.getMutableDeclSpec().ClearStorageClassSpecs(); 842 } 843 844 if (!isFunc && 845 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 846 D.getNumTypeObjects() == 0) { 847 // Check also for this case: 848 // 849 // typedef int f(); 850 // f a; 851 // 852 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 853 isFunc = TDType->isFunctionType(); 854 } 855 856 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 857 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 858 !isFunc); 859 860 Decl *Member; 861 if (isInstField) { 862 // FIXME: Check for template parameters! 863 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 864 AS); 865 assert(Member && "HandleField never returns null"); 866 } else { 867 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 868 .getAs<Decl>(); 869 if (!Member) { 870 if (BitWidth) DeleteExpr(BitWidth); 871 return DeclPtrTy(); 872 } 873 874 // Non-instance-fields can't have a bitfield. 875 if (BitWidth) { 876 if (Member->isInvalidDecl()) { 877 // don't emit another diagnostic. 878 } else if (isa<VarDecl>(Member)) { 879 // C++ 9.6p3: A bit-field shall not be a static member. 880 // "static member 'A' cannot be a bit-field" 881 Diag(Loc, diag::err_static_not_bitfield) 882 << Name << BitWidth->getSourceRange(); 883 } else if (isa<TypedefDecl>(Member)) { 884 // "typedef member 'x' cannot be a bit-field" 885 Diag(Loc, diag::err_typedef_not_bitfield) 886 << Name << BitWidth->getSourceRange(); 887 } else { 888 // A function typedef ("typedef int f(); f a;"). 889 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 890 Diag(Loc, diag::err_not_integral_type_bitfield) 891 << Name << cast<ValueDecl>(Member)->getType() 892 << BitWidth->getSourceRange(); 893 } 894 895 DeleteExpr(BitWidth); 896 BitWidth = 0; 897 Member->setInvalidDecl(); 898 } 899 900 Member->setAccess(AS); 901 902 // If we have declared a member function template, set the access of the 903 // templated declaration as well. 904 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 905 FunTmpl->getTemplatedDecl()->setAccess(AS); 906 } 907 908 assert((Name || isInstField) && "No identifier for non-field ?"); 909 910 if (Init) 911 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 912 if (Deleted) // FIXME: Source location is not very good. 913 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 914 915 if (isInstField) { 916 FieldCollector->Add(cast<FieldDecl>(Member)); 917 return DeclPtrTy(); 918 } 919 return DeclPtrTy::make(Member); 920} 921 922/// ActOnMemInitializer - Handle a C++ member initializer. 923Sema::MemInitResult 924Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 925 Scope *S, 926 const CXXScopeSpec &SS, 927 IdentifierInfo *MemberOrBase, 928 TypeTy *TemplateTypeTy, 929 SourceLocation IdLoc, 930 SourceLocation LParenLoc, 931 ExprTy **Args, unsigned NumArgs, 932 SourceLocation *CommaLocs, 933 SourceLocation RParenLoc) { 934 if (!ConstructorD) 935 return true; 936 937 AdjustDeclIfTemplate(ConstructorD); 938 939 CXXConstructorDecl *Constructor 940 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 941 if (!Constructor) { 942 // The user wrote a constructor initializer on a function that is 943 // not a C++ constructor. Ignore the error for now, because we may 944 // have more member initializers coming; we'll diagnose it just 945 // once in ActOnMemInitializers. 946 return true; 947 } 948 949 CXXRecordDecl *ClassDecl = Constructor->getParent(); 950 951 // C++ [class.base.init]p2: 952 // Names in a mem-initializer-id are looked up in the scope of the 953 // constructor’s class and, if not found in that scope, are looked 954 // up in the scope containing the constructor’s 955 // definition. [Note: if the constructor’s class contains a member 956 // with the same name as a direct or virtual base class of the 957 // class, a mem-initializer-id naming the member or base class and 958 // composed of a single identifier refers to the class member. A 959 // mem-initializer-id for the hidden base class may be specified 960 // using a qualified name. ] 961 if (!SS.getScopeRep() && !TemplateTypeTy) { 962 // Look for a member, first. 963 FieldDecl *Member = 0; 964 DeclContext::lookup_result Result 965 = ClassDecl->lookup(MemberOrBase); 966 if (Result.first != Result.second) 967 Member = dyn_cast<FieldDecl>(*Result.first); 968 969 // FIXME: Handle members of an anonymous union. 970 971 if (Member) 972 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 973 RParenLoc); 974 } 975 // It didn't name a member, so see if it names a class. 976 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 977 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 978 if (!BaseTy) 979 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 980 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 981 982 QualType BaseType = GetTypeFromParser(BaseTy); 983 984 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 985 RParenLoc, ClassDecl); 986} 987 988/// Checks an initializer expression for use of uninitialized fields, such as 989/// containing the field that is being initialized. Returns true if there is an 990/// uninitialized field was used an updates the SourceLocation parameter; false 991/// otherwise. 992static bool InitExprContainsUninitializedFields(const Stmt* S, 993 const FieldDecl* LhsField, 994 SourceLocation* L) { 995 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 996 if (ME) { 997 const NamedDecl* RhsField = ME->getMemberDecl(); 998 if (RhsField == LhsField) { 999 // Initializing a field with itself. Throw a warning. 1000 // But wait; there are exceptions! 1001 // Exception #1: The field may not belong to this record. 1002 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1003 const Expr* base = ME->getBase(); 1004 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1005 // Even though the field matches, it does not belong to this record. 1006 return false; 1007 } 1008 // None of the exceptions triggered; return true to indicate an 1009 // uninitialized field was used. 1010 *L = ME->getMemberLoc(); 1011 return true; 1012 } 1013 } 1014 bool found = false; 1015 for (Stmt::const_child_iterator it = S->child_begin(); 1016 it != S->child_end() && found == false; 1017 ++it) { 1018 if (isa<CallExpr>(S)) { 1019 // Do not descend into function calls or constructors, as the use 1020 // of an uninitialized field may be valid. One would have to inspect 1021 // the contents of the function/ctor to determine if it is safe or not. 1022 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1023 // may be safe, depending on what the function/ctor does. 1024 continue; 1025 } 1026 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1027 } 1028 return found; 1029} 1030 1031Sema::MemInitResult 1032Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1033 unsigned NumArgs, SourceLocation IdLoc, 1034 SourceLocation RParenLoc) { 1035 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1036 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1037 ExprTemporaries.clear(); 1038 1039 // Diagnose value-uses of fields to initialize themselves, e.g. 1040 // foo(foo) 1041 // where foo is not also a parameter to the constructor. 1042 // TODO: implement -Wuninitialized and fold this into that framework. 1043 for (unsigned i = 0; i < NumArgs; ++i) { 1044 SourceLocation L; 1045 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1046 // FIXME: Return true in the case when other fields are used before being 1047 // uninitialized. For example, let this field be the i'th field. When 1048 // initializing the i'th field, throw a warning if any of the >= i'th 1049 // fields are used, as they are not yet initialized. 1050 // Right now we are only handling the case where the i'th field uses 1051 // itself in its initializer. 1052 Diag(L, diag::warn_field_is_uninit); 1053 } 1054 } 1055 1056 bool HasDependentArg = false; 1057 for (unsigned i = 0; i < NumArgs; i++) 1058 HasDependentArg |= Args[i]->isTypeDependent(); 1059 1060 CXXConstructorDecl *C = 0; 1061 QualType FieldType = Member->getType(); 1062 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1063 FieldType = Array->getElementType(); 1064 if (FieldType->isDependentType()) { 1065 // Can't check init for dependent type. 1066 } else if (FieldType->isRecordType()) { 1067 // Member is a record (struct/union/class), so pass the initializer 1068 // arguments down to the record's constructor. 1069 if (!HasDependentArg) { 1070 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1071 1072 C = PerformInitializationByConstructor(FieldType, 1073 MultiExprArg(*this, 1074 (void**)Args, 1075 NumArgs), 1076 IdLoc, 1077 SourceRange(IdLoc, RParenLoc), 1078 Member->getDeclName(), IK_Direct, 1079 ConstructorArgs); 1080 1081 if (C) { 1082 // Take over the constructor arguments as our own. 1083 NumArgs = ConstructorArgs.size(); 1084 Args = (Expr **)ConstructorArgs.take(); 1085 } 1086 } 1087 } else if (NumArgs != 1 && NumArgs != 0) { 1088 // The member type is not a record type (or an array of record 1089 // types), so it can be only be default- or copy-initialized. 1090 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1091 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1092 } else if (!HasDependentArg) { 1093 Expr *NewExp; 1094 if (NumArgs == 0) { 1095 if (FieldType->isReferenceType()) { 1096 Diag(IdLoc, diag::err_null_intialized_reference_member) 1097 << Member->getDeclName(); 1098 return Diag(Member->getLocation(), diag::note_declared_at); 1099 } 1100 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1101 NumArgs = 1; 1102 } 1103 else 1104 NewExp = (Expr*)Args[0]; 1105 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1106 return true; 1107 Args[0] = NewExp; 1108 } 1109 1110 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1111 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1112 ExprTemporaries.clear(); 1113 1114 // FIXME: Perform direct initialization of the member. 1115 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1116 NumArgs, C, IdLoc, RParenLoc); 1117} 1118 1119Sema::MemInitResult 1120Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1121 unsigned NumArgs, SourceLocation IdLoc, 1122 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1123 bool HasDependentArg = false; 1124 for (unsigned i = 0; i < NumArgs; i++) 1125 HasDependentArg |= Args[i]->isTypeDependent(); 1126 1127 if (!BaseType->isDependentType()) { 1128 if (!BaseType->isRecordType()) 1129 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1130 << BaseType << SourceRange(IdLoc, RParenLoc); 1131 1132 // C++ [class.base.init]p2: 1133 // [...] Unless the mem-initializer-id names a nonstatic data 1134 // member of the constructor’s class or a direct or virtual base 1135 // of that class, the mem-initializer is ill-formed. A 1136 // mem-initializer-list can initialize a base class using any 1137 // name that denotes that base class type. 1138 1139 // First, check for a direct base class. 1140 const CXXBaseSpecifier *DirectBaseSpec = 0; 1141 for (CXXRecordDecl::base_class_const_iterator Base = 1142 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1143 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 1144 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 1145 // We found a direct base of this type. That's what we're 1146 // initializing. 1147 DirectBaseSpec = &*Base; 1148 break; 1149 } 1150 } 1151 1152 // Check for a virtual base class. 1153 // FIXME: We might be able to short-circuit this if we know in advance that 1154 // there are no virtual bases. 1155 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1156 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1157 // We haven't found a base yet; search the class hierarchy for a 1158 // virtual base class. 1159 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1160 /*DetectVirtual=*/false); 1161 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1162 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1163 Path != Paths.end(); ++Path) { 1164 if (Path->back().Base->isVirtual()) { 1165 VirtualBaseSpec = Path->back().Base; 1166 break; 1167 } 1168 } 1169 } 1170 } 1171 1172 // C++ [base.class.init]p2: 1173 // If a mem-initializer-id is ambiguous because it designates both 1174 // a direct non-virtual base class and an inherited virtual base 1175 // class, the mem-initializer is ill-formed. 1176 if (DirectBaseSpec && VirtualBaseSpec) 1177 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1178 << BaseType << SourceRange(IdLoc, RParenLoc); 1179 // C++ [base.class.init]p2: 1180 // Unless the mem-initializer-id names a nonstatic data membeer of the 1181 // constructor's class ot a direst or virtual base of that class, the 1182 // mem-initializer is ill-formed. 1183 if (!DirectBaseSpec && !VirtualBaseSpec) 1184 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1185 << BaseType << ClassDecl->getNameAsCString() 1186 << SourceRange(IdLoc, RParenLoc); 1187 } 1188 1189 CXXConstructorDecl *C = 0; 1190 if (!BaseType->isDependentType() && !HasDependentArg) { 1191 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1192 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1193 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1194 1195 C = PerformInitializationByConstructor(BaseType, 1196 MultiExprArg(*this, 1197 (void**)Args, NumArgs), 1198 IdLoc, SourceRange(IdLoc, RParenLoc), 1199 Name, IK_Direct, 1200 ConstructorArgs); 1201 if (C) { 1202 // Take over the constructor arguments as our own. 1203 NumArgs = ConstructorArgs.size(); 1204 Args = (Expr **)ConstructorArgs.take(); 1205 } 1206 } 1207 1208 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1209 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1210 ExprTemporaries.clear(); 1211 1212 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1213 NumArgs, C, IdLoc, RParenLoc); 1214} 1215 1216bool 1217Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1218 CXXBaseOrMemberInitializer **Initializers, 1219 unsigned NumInitializers, 1220 bool IsImplicitConstructor) { 1221 // We need to build the initializer AST according to order of construction 1222 // and not what user specified in the Initializers list. 1223 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1224 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1225 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1226 bool HasDependentBaseInit = false; 1227 bool HadError = false; 1228 1229 for (unsigned i = 0; i < NumInitializers; i++) { 1230 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1231 if (Member->isBaseInitializer()) { 1232 if (Member->getBaseClass()->isDependentType()) 1233 HasDependentBaseInit = true; 1234 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1235 } else { 1236 AllBaseFields[Member->getMember()] = Member; 1237 } 1238 } 1239 1240 if (HasDependentBaseInit) { 1241 // FIXME. This does not preserve the ordering of the initializers. 1242 // Try (with -Wreorder) 1243 // template<class X> struct A {}; 1244 // template<class X> struct B : A<X> { 1245 // B() : x1(10), A<X>() {} 1246 // int x1; 1247 // }; 1248 // B<int> x; 1249 // On seeing one dependent type, we should essentially exit this routine 1250 // while preserving user-declared initializer list. When this routine is 1251 // called during instantiatiation process, this routine will rebuild the 1252 // ordered initializer list correctly. 1253 1254 // If we have a dependent base initialization, we can't determine the 1255 // association between initializers and bases; just dump the known 1256 // initializers into the list, and don't try to deal with other bases. 1257 for (unsigned i = 0; i < NumInitializers; i++) { 1258 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1259 if (Member->isBaseInitializer()) 1260 AllToInit.push_back(Member); 1261 } 1262 } else { 1263 // Push virtual bases before others. 1264 for (CXXRecordDecl::base_class_iterator VBase = 1265 ClassDecl->vbases_begin(), 1266 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1267 if (VBase->getType()->isDependentType()) 1268 continue; 1269 if (CXXBaseOrMemberInitializer *Value 1270 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1271 AllToInit.push_back(Value); 1272 } 1273 else { 1274 CXXRecordDecl *VBaseDecl = 1275 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1276 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1277 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1278 if (!Ctor) { 1279 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1280 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1281 << 0 << VBase->getType(); 1282 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1283 << Context.getTagDeclType(VBaseDecl); 1284 HadError = true; 1285 continue; 1286 } 1287 1288 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1289 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1290 Constructor->getLocation(), CtorArgs)) 1291 continue; 1292 1293 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1294 1295 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1296 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1297 ExprTemporaries.clear(); 1298 CXXBaseOrMemberInitializer *Member = 1299 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1300 CtorArgs.takeAs<Expr>(), 1301 CtorArgs.size(), Ctor, 1302 SourceLocation(), 1303 SourceLocation()); 1304 AllToInit.push_back(Member); 1305 } 1306 } 1307 1308 for (CXXRecordDecl::base_class_iterator Base = 1309 ClassDecl->bases_begin(), 1310 E = ClassDecl->bases_end(); Base != E; ++Base) { 1311 // Virtuals are in the virtual base list and already constructed. 1312 if (Base->isVirtual()) 1313 continue; 1314 // Skip dependent types. 1315 if (Base->getType()->isDependentType()) 1316 continue; 1317 if (CXXBaseOrMemberInitializer *Value 1318 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1319 AllToInit.push_back(Value); 1320 } 1321 else { 1322 CXXRecordDecl *BaseDecl = 1323 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1324 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1325 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1326 if (!Ctor) { 1327 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1328 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1329 << 0 << Base->getType(); 1330 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1331 << Context.getTagDeclType(BaseDecl); 1332 HadError = true; 1333 continue; 1334 } 1335 1336 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1337 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1338 Constructor->getLocation(), CtorArgs)) 1339 continue; 1340 1341 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1342 1343 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1344 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1345 ExprTemporaries.clear(); 1346 CXXBaseOrMemberInitializer *Member = 1347 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1348 CtorArgs.takeAs<Expr>(), 1349 CtorArgs.size(), Ctor, 1350 SourceLocation(), 1351 SourceLocation()); 1352 AllToInit.push_back(Member); 1353 } 1354 } 1355 } 1356 1357 // non-static data members. 1358 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1359 E = ClassDecl->field_end(); Field != E; ++Field) { 1360 if ((*Field)->isAnonymousStructOrUnion()) { 1361 if (const RecordType *FieldClassType = 1362 Field->getType()->getAs<RecordType>()) { 1363 CXXRecordDecl *FieldClassDecl 1364 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1365 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1366 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1367 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1368 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1369 // set to the anonymous union data member used in the initializer 1370 // list. 1371 Value->setMember(*Field); 1372 Value->setAnonUnionMember(*FA); 1373 AllToInit.push_back(Value); 1374 break; 1375 } 1376 } 1377 } 1378 continue; 1379 } 1380 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1381 AllToInit.push_back(Value); 1382 continue; 1383 } 1384 1385 if ((*Field)->getType()->isDependentType()) 1386 continue; 1387 1388 QualType FT = Context.getBaseElementType((*Field)->getType()); 1389 if (const RecordType* RT = FT->getAs<RecordType>()) { 1390 CXXConstructorDecl *Ctor = 1391 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1392 if (!Ctor) { 1393 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1394 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1395 << 1 << (*Field)->getDeclName(); 1396 Diag(Field->getLocation(), diag::note_field_decl); 1397 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1398 << Context.getTagDeclType(RT->getDecl()); 1399 HadError = true; 1400 continue; 1401 } 1402 1403 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1404 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1405 Constructor->getLocation(), CtorArgs)) 1406 continue; 1407 1408 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1409 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1410 ExprTemporaries.clear(); 1411 CXXBaseOrMemberInitializer *Member = 1412 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1413 CtorArgs.size(), Ctor, 1414 SourceLocation(), 1415 SourceLocation()); 1416 1417 AllToInit.push_back(Member); 1418 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1419 if (FT.isConstQualified() && Ctor->isTrivial()) { 1420 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1421 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1422 << 1 << (*Field)->getDeclName(); 1423 Diag((*Field)->getLocation(), diag::note_declared_at); 1424 HadError = true; 1425 } 1426 } 1427 else if (FT->isReferenceType()) { 1428 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1429 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1430 << 0 << (*Field)->getDeclName(); 1431 Diag((*Field)->getLocation(), diag::note_declared_at); 1432 HadError = true; 1433 } 1434 else if (FT.isConstQualified()) { 1435 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1436 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1437 << 1 << (*Field)->getDeclName(); 1438 Diag((*Field)->getLocation(), diag::note_declared_at); 1439 HadError = true; 1440 } 1441 } 1442 1443 NumInitializers = AllToInit.size(); 1444 if (NumInitializers > 0) { 1445 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1446 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1447 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1448 1449 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1450 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1451 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1452 } 1453 1454 return HadError; 1455} 1456 1457static void *GetKeyForTopLevelField(FieldDecl *Field) { 1458 // For anonymous unions, use the class declaration as the key. 1459 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1460 if (RT->getDecl()->isAnonymousStructOrUnion()) 1461 return static_cast<void *>(RT->getDecl()); 1462 } 1463 return static_cast<void *>(Field); 1464} 1465 1466static void *GetKeyForBase(QualType BaseType) { 1467 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1468 return (void *)RT; 1469 1470 assert(0 && "Unexpected base type!"); 1471 return 0; 1472} 1473 1474static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1475 bool MemberMaybeAnon = false) { 1476 // For fields injected into the class via declaration of an anonymous union, 1477 // use its anonymous union class declaration as the unique key. 1478 if (Member->isMemberInitializer()) { 1479 FieldDecl *Field = Member->getMember(); 1480 1481 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1482 // data member of the class. Data member used in the initializer list is 1483 // in AnonUnionMember field. 1484 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1485 Field = Member->getAnonUnionMember(); 1486 if (Field->getDeclContext()->isRecord()) { 1487 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1488 if (RD->isAnonymousStructOrUnion()) 1489 return static_cast<void *>(RD); 1490 } 1491 return static_cast<void *>(Field); 1492 } 1493 1494 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1495} 1496 1497/// ActOnMemInitializers - Handle the member initializers for a constructor. 1498void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1499 SourceLocation ColonLoc, 1500 MemInitTy **MemInits, unsigned NumMemInits) { 1501 if (!ConstructorDecl) 1502 return; 1503 1504 AdjustDeclIfTemplate(ConstructorDecl); 1505 1506 CXXConstructorDecl *Constructor 1507 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1508 1509 if (!Constructor) { 1510 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1511 return; 1512 } 1513 1514 if (!Constructor->isDependentContext()) { 1515 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1516 bool err = false; 1517 for (unsigned i = 0; i < NumMemInits; i++) { 1518 CXXBaseOrMemberInitializer *Member = 1519 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1520 void *KeyToMember = GetKeyForMember(Member); 1521 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1522 if (!PrevMember) { 1523 PrevMember = Member; 1524 continue; 1525 } 1526 if (FieldDecl *Field = Member->getMember()) 1527 Diag(Member->getSourceLocation(), 1528 diag::error_multiple_mem_initialization) 1529 << Field->getNameAsString(); 1530 else { 1531 Type *BaseClass = Member->getBaseClass(); 1532 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1533 Diag(Member->getSourceLocation(), 1534 diag::error_multiple_base_initialization) 1535 << QualType(BaseClass, 0); 1536 } 1537 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1538 << 0; 1539 err = true; 1540 } 1541 1542 if (err) 1543 return; 1544 } 1545 1546 SetBaseOrMemberInitializers(Constructor, 1547 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1548 NumMemInits, false); 1549 1550 if (Constructor->isDependentContext()) 1551 return; 1552 1553 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1554 Diagnostic::Ignored && 1555 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1556 Diagnostic::Ignored) 1557 return; 1558 1559 // Also issue warning if order of ctor-initializer list does not match order 1560 // of 1) base class declarations and 2) order of non-static data members. 1561 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1562 1563 CXXRecordDecl *ClassDecl 1564 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1565 // Push virtual bases before others. 1566 for (CXXRecordDecl::base_class_iterator VBase = 1567 ClassDecl->vbases_begin(), 1568 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1569 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1570 1571 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1572 E = ClassDecl->bases_end(); Base != E; ++Base) { 1573 // Virtuals are alread in the virtual base list and are constructed 1574 // first. 1575 if (Base->isVirtual()) 1576 continue; 1577 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1578 } 1579 1580 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1581 E = ClassDecl->field_end(); Field != E; ++Field) 1582 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1583 1584 int Last = AllBaseOrMembers.size(); 1585 int curIndex = 0; 1586 CXXBaseOrMemberInitializer *PrevMember = 0; 1587 for (unsigned i = 0; i < NumMemInits; i++) { 1588 CXXBaseOrMemberInitializer *Member = 1589 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1590 void *MemberInCtorList = GetKeyForMember(Member, true); 1591 1592 for (; curIndex < Last; curIndex++) 1593 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1594 break; 1595 if (curIndex == Last) { 1596 assert(PrevMember && "Member not in member list?!"); 1597 // Initializer as specified in ctor-initializer list is out of order. 1598 // Issue a warning diagnostic. 1599 if (PrevMember->isBaseInitializer()) { 1600 // Diagnostics is for an initialized base class. 1601 Type *BaseClass = PrevMember->getBaseClass(); 1602 Diag(PrevMember->getSourceLocation(), 1603 diag::warn_base_initialized) 1604 << QualType(BaseClass, 0); 1605 } else { 1606 FieldDecl *Field = PrevMember->getMember(); 1607 Diag(PrevMember->getSourceLocation(), 1608 diag::warn_field_initialized) 1609 << Field->getNameAsString(); 1610 } 1611 // Also the note! 1612 if (FieldDecl *Field = Member->getMember()) 1613 Diag(Member->getSourceLocation(), 1614 diag::note_fieldorbase_initialized_here) << 0 1615 << Field->getNameAsString(); 1616 else { 1617 Type *BaseClass = Member->getBaseClass(); 1618 Diag(Member->getSourceLocation(), 1619 diag::note_fieldorbase_initialized_here) << 1 1620 << QualType(BaseClass, 0); 1621 } 1622 for (curIndex = 0; curIndex < Last; curIndex++) 1623 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1624 break; 1625 } 1626 PrevMember = Member; 1627 } 1628} 1629 1630void 1631Sema::computeBaseOrMembersToDestroy(CXXDestructorDecl *Destructor) { 1632 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1633 llvm::SmallVector<uintptr_t, 32> AllToDestruct; 1634 1635 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1636 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1637 if (VBase->getType()->isDependentType()) 1638 continue; 1639 // Skip over virtual bases which have trivial destructors. 1640 CXXRecordDecl *BaseClassDecl 1641 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1642 if (BaseClassDecl->hasTrivialDestructor()) 1643 continue; 1644 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1645 MarkDeclarationReferenced(Destructor->getLocation(), 1646 const_cast<CXXDestructorDecl*>(Dtor)); 1647 1648 uintptr_t Member = 1649 reinterpret_cast<uintptr_t>(VBase->getType().getTypePtr()) 1650 | CXXDestructorDecl::VBASE; 1651 AllToDestruct.push_back(Member); 1652 } 1653 for (CXXRecordDecl::base_class_iterator Base = 1654 ClassDecl->bases_begin(), 1655 E = ClassDecl->bases_end(); Base != E; ++Base) { 1656 if (Base->isVirtual()) 1657 continue; 1658 if (Base->getType()->isDependentType()) 1659 continue; 1660 // Skip over virtual bases which have trivial destructors. 1661 CXXRecordDecl *BaseClassDecl 1662 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1663 if (BaseClassDecl->hasTrivialDestructor()) 1664 continue; 1665 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1666 MarkDeclarationReferenced(Destructor->getLocation(), 1667 const_cast<CXXDestructorDecl*>(Dtor)); 1668 uintptr_t Member = 1669 reinterpret_cast<uintptr_t>(Base->getType().getTypePtr()) 1670 | CXXDestructorDecl::DRCTNONVBASE; 1671 AllToDestruct.push_back(Member); 1672 } 1673 1674 // non-static data members. 1675 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1676 E = ClassDecl->field_end(); Field != E; ++Field) { 1677 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 1678 1679 if (const RecordType* RT = FieldType->getAs<RecordType>()) { 1680 // Skip over virtual bases which have trivial destructors. 1681 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1682 if (FieldClassDecl->hasTrivialDestructor()) 1683 continue; 1684 if (const CXXDestructorDecl *Dtor = 1685 FieldClassDecl->getDestructor(Context)) 1686 MarkDeclarationReferenced(Destructor->getLocation(), 1687 const_cast<CXXDestructorDecl*>(Dtor)); 1688 uintptr_t Member = reinterpret_cast<uintptr_t>(*Field); 1689 AllToDestruct.push_back(Member); 1690 } 1691 } 1692 1693 unsigned NumDestructions = AllToDestruct.size(); 1694 if (NumDestructions > 0) { 1695 Destructor->setNumBaseOrMemberDestructions(NumDestructions); 1696 uintptr_t *BaseOrMemberDestructions = 1697 new (Context) uintptr_t [NumDestructions]; 1698 // Insert in reverse order. 1699 for (int Idx = NumDestructions-1, i=0 ; Idx >= 0; --Idx) 1700 BaseOrMemberDestructions[i++] = AllToDestruct[Idx]; 1701 Destructor->setBaseOrMemberDestructions(BaseOrMemberDestructions); 1702 } 1703} 1704 1705void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1706 if (!CDtorDecl) 1707 return; 1708 1709 AdjustDeclIfTemplate(CDtorDecl); 1710 1711 if (CXXConstructorDecl *Constructor 1712 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1713 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1714} 1715 1716namespace { 1717 /// PureVirtualMethodCollector - traverses a class and its superclasses 1718 /// and determines if it has any pure virtual methods. 1719 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1720 ASTContext &Context; 1721 1722 public: 1723 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1724 1725 private: 1726 MethodList Methods; 1727 1728 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1729 1730 public: 1731 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1732 : Context(Ctx) { 1733 1734 MethodList List; 1735 Collect(RD, List); 1736 1737 // Copy the temporary list to methods, and make sure to ignore any 1738 // null entries. 1739 for (size_t i = 0, e = List.size(); i != e; ++i) { 1740 if (List[i]) 1741 Methods.push_back(List[i]); 1742 } 1743 } 1744 1745 bool empty() const { return Methods.empty(); } 1746 1747 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1748 MethodList::const_iterator methods_end() { return Methods.end(); } 1749 }; 1750 1751 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1752 MethodList& Methods) { 1753 // First, collect the pure virtual methods for the base classes. 1754 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1755 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1756 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1757 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1758 if (BaseDecl && BaseDecl->isAbstract()) 1759 Collect(BaseDecl, Methods); 1760 } 1761 } 1762 1763 // Next, zero out any pure virtual methods that this class overrides. 1764 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1765 1766 MethodSetTy OverriddenMethods; 1767 size_t MethodsSize = Methods.size(); 1768 1769 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1770 i != e; ++i) { 1771 // Traverse the record, looking for methods. 1772 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1773 // If the method is pure virtual, add it to the methods vector. 1774 if (MD->isPure()) 1775 Methods.push_back(MD); 1776 1777 // Record all the overridden methods in our set. 1778 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1779 E = MD->end_overridden_methods(); I != E; ++I) { 1780 // Keep track of the overridden methods. 1781 OverriddenMethods.insert(*I); 1782 } 1783 } 1784 } 1785 1786 // Now go through the methods and zero out all the ones we know are 1787 // overridden. 1788 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1789 if (OverriddenMethods.count(Methods[i])) 1790 Methods[i] = 0; 1791 } 1792 1793 } 1794} 1795 1796 1797bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1798 unsigned DiagID, AbstractDiagSelID SelID, 1799 const CXXRecordDecl *CurrentRD) { 1800 if (SelID == -1) 1801 return RequireNonAbstractType(Loc, T, 1802 PDiag(DiagID), CurrentRD); 1803 else 1804 return RequireNonAbstractType(Loc, T, 1805 PDiag(DiagID) << SelID, CurrentRD); 1806} 1807 1808bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1809 const PartialDiagnostic &PD, 1810 const CXXRecordDecl *CurrentRD) { 1811 if (!getLangOptions().CPlusPlus) 1812 return false; 1813 1814 if (const ArrayType *AT = Context.getAsArrayType(T)) 1815 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1816 CurrentRD); 1817 1818 if (const PointerType *PT = T->getAs<PointerType>()) { 1819 // Find the innermost pointer type. 1820 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1821 PT = T; 1822 1823 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1824 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1825 } 1826 1827 const RecordType *RT = T->getAs<RecordType>(); 1828 if (!RT) 1829 return false; 1830 1831 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1832 if (!RD) 1833 return false; 1834 1835 if (CurrentRD && CurrentRD != RD) 1836 return false; 1837 1838 if (!RD->isAbstract()) 1839 return false; 1840 1841 Diag(Loc, PD) << RD->getDeclName(); 1842 1843 // Check if we've already emitted the list of pure virtual functions for this 1844 // class. 1845 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1846 return true; 1847 1848 PureVirtualMethodCollector Collector(Context, RD); 1849 1850 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1851 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1852 const CXXMethodDecl *MD = *I; 1853 1854 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1855 MD->getDeclName(); 1856 } 1857 1858 if (!PureVirtualClassDiagSet) 1859 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1860 PureVirtualClassDiagSet->insert(RD); 1861 1862 return true; 1863} 1864 1865namespace { 1866 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1867 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1868 Sema &SemaRef; 1869 CXXRecordDecl *AbstractClass; 1870 1871 bool VisitDeclContext(const DeclContext *DC) { 1872 bool Invalid = false; 1873 1874 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1875 E = DC->decls_end(); I != E; ++I) 1876 Invalid |= Visit(*I); 1877 1878 return Invalid; 1879 } 1880 1881 public: 1882 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1883 : SemaRef(SemaRef), AbstractClass(ac) { 1884 Visit(SemaRef.Context.getTranslationUnitDecl()); 1885 } 1886 1887 bool VisitFunctionDecl(const FunctionDecl *FD) { 1888 if (FD->isThisDeclarationADefinition()) { 1889 // No need to do the check if we're in a definition, because it requires 1890 // that the return/param types are complete. 1891 // because that requires 1892 return VisitDeclContext(FD); 1893 } 1894 1895 // Check the return type. 1896 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1897 bool Invalid = 1898 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1899 diag::err_abstract_type_in_decl, 1900 Sema::AbstractReturnType, 1901 AbstractClass); 1902 1903 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1904 E = FD->param_end(); I != E; ++I) { 1905 const ParmVarDecl *VD = *I; 1906 Invalid |= 1907 SemaRef.RequireNonAbstractType(VD->getLocation(), 1908 VD->getOriginalType(), 1909 diag::err_abstract_type_in_decl, 1910 Sema::AbstractParamType, 1911 AbstractClass); 1912 } 1913 1914 return Invalid; 1915 } 1916 1917 bool VisitDecl(const Decl* D) { 1918 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1919 return VisitDeclContext(DC); 1920 1921 return false; 1922 } 1923 }; 1924} 1925 1926void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1927 DeclPtrTy TagDecl, 1928 SourceLocation LBrac, 1929 SourceLocation RBrac) { 1930 if (!TagDecl) 1931 return; 1932 1933 AdjustDeclIfTemplate(TagDecl); 1934 ActOnFields(S, RLoc, TagDecl, 1935 (DeclPtrTy*)FieldCollector->getCurFields(), 1936 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1937 1938 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1939 if (!RD->isAbstract()) { 1940 // Collect all the pure virtual methods and see if this is an abstract 1941 // class after all. 1942 PureVirtualMethodCollector Collector(Context, RD); 1943 if (!Collector.empty()) 1944 RD->setAbstract(true); 1945 } 1946 1947 if (RD->isAbstract()) 1948 AbstractClassUsageDiagnoser(*this, RD); 1949 1950 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1951 AddImplicitlyDeclaredMembersToClass(RD); 1952} 1953 1954/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1955/// special functions, such as the default constructor, copy 1956/// constructor, or destructor, to the given C++ class (C++ 1957/// [special]p1). This routine can only be executed just before the 1958/// definition of the class is complete. 1959void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1960 CanQualType ClassType 1961 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1962 1963 // FIXME: Implicit declarations have exception specifications, which are 1964 // the union of the specifications of the implicitly called functions. 1965 1966 if (!ClassDecl->hasUserDeclaredConstructor()) { 1967 // C++ [class.ctor]p5: 1968 // A default constructor for a class X is a constructor of class X 1969 // that can be called without an argument. If there is no 1970 // user-declared constructor for class X, a default constructor is 1971 // implicitly declared. An implicitly-declared default constructor 1972 // is an inline public member of its class. 1973 DeclarationName Name 1974 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1975 CXXConstructorDecl *DefaultCon = 1976 CXXConstructorDecl::Create(Context, ClassDecl, 1977 ClassDecl->getLocation(), Name, 1978 Context.getFunctionType(Context.VoidTy, 1979 0, 0, false, 0), 1980 /*DInfo=*/0, 1981 /*isExplicit=*/false, 1982 /*isInline=*/true, 1983 /*isImplicitlyDeclared=*/true); 1984 DefaultCon->setAccess(AS_public); 1985 DefaultCon->setImplicit(); 1986 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1987 ClassDecl->addDecl(DefaultCon); 1988 } 1989 1990 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1991 // C++ [class.copy]p4: 1992 // If the class definition does not explicitly declare a copy 1993 // constructor, one is declared implicitly. 1994 1995 // C++ [class.copy]p5: 1996 // The implicitly-declared copy constructor for a class X will 1997 // have the form 1998 // 1999 // X::X(const X&) 2000 // 2001 // if 2002 bool HasConstCopyConstructor = true; 2003 2004 // -- each direct or virtual base class B of X has a copy 2005 // constructor whose first parameter is of type const B& or 2006 // const volatile B&, and 2007 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2008 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2009 const CXXRecordDecl *BaseClassDecl 2010 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2011 HasConstCopyConstructor 2012 = BaseClassDecl->hasConstCopyConstructor(Context); 2013 } 2014 2015 // -- for all the nonstatic data members of X that are of a 2016 // class type M (or array thereof), each such class type 2017 // has a copy constructor whose first parameter is of type 2018 // const M& or const volatile M&. 2019 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2020 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2021 ++Field) { 2022 QualType FieldType = (*Field)->getType(); 2023 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2024 FieldType = Array->getElementType(); 2025 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2026 const CXXRecordDecl *FieldClassDecl 2027 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2028 HasConstCopyConstructor 2029 = FieldClassDecl->hasConstCopyConstructor(Context); 2030 } 2031 } 2032 2033 // Otherwise, the implicitly declared copy constructor will have 2034 // the form 2035 // 2036 // X::X(X&) 2037 QualType ArgType = ClassType; 2038 if (HasConstCopyConstructor) 2039 ArgType = ArgType.withConst(); 2040 ArgType = Context.getLValueReferenceType(ArgType); 2041 2042 // An implicitly-declared copy constructor is an inline public 2043 // member of its class. 2044 DeclarationName Name 2045 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2046 CXXConstructorDecl *CopyConstructor 2047 = CXXConstructorDecl::Create(Context, ClassDecl, 2048 ClassDecl->getLocation(), Name, 2049 Context.getFunctionType(Context.VoidTy, 2050 &ArgType, 1, 2051 false, 0), 2052 /*DInfo=*/0, 2053 /*isExplicit=*/false, 2054 /*isInline=*/true, 2055 /*isImplicitlyDeclared=*/true); 2056 CopyConstructor->setAccess(AS_public); 2057 CopyConstructor->setImplicit(); 2058 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2059 2060 // Add the parameter to the constructor. 2061 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2062 ClassDecl->getLocation(), 2063 /*IdentifierInfo=*/0, 2064 ArgType, /*DInfo=*/0, 2065 VarDecl::None, 0); 2066 CopyConstructor->setParams(Context, &FromParam, 1); 2067 ClassDecl->addDecl(CopyConstructor); 2068 } 2069 2070 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2071 // Note: The following rules are largely analoguous to the copy 2072 // constructor rules. Note that virtual bases are not taken into account 2073 // for determining the argument type of the operator. Note also that 2074 // operators taking an object instead of a reference are allowed. 2075 // 2076 // C++ [class.copy]p10: 2077 // If the class definition does not explicitly declare a copy 2078 // assignment operator, one is declared implicitly. 2079 // The implicitly-defined copy assignment operator for a class X 2080 // will have the form 2081 // 2082 // X& X::operator=(const X&) 2083 // 2084 // if 2085 bool HasConstCopyAssignment = true; 2086 2087 // -- each direct base class B of X has a copy assignment operator 2088 // whose parameter is of type const B&, const volatile B& or B, 2089 // and 2090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2091 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2092 assert(!Base->getType()->isDependentType() && 2093 "Cannot generate implicit members for class with dependent bases."); 2094 const CXXRecordDecl *BaseClassDecl 2095 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2096 const CXXMethodDecl *MD = 0; 2097 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2098 MD); 2099 } 2100 2101 // -- for all the nonstatic data members of X that are of a class 2102 // type M (or array thereof), each such class type has a copy 2103 // assignment operator whose parameter is of type const M&, 2104 // const volatile M& or M. 2105 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2106 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2107 ++Field) { 2108 QualType FieldType = (*Field)->getType(); 2109 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2110 FieldType = Array->getElementType(); 2111 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2112 const CXXRecordDecl *FieldClassDecl 2113 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2114 const CXXMethodDecl *MD = 0; 2115 HasConstCopyAssignment 2116 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2117 } 2118 } 2119 2120 // Otherwise, the implicitly declared copy assignment operator will 2121 // have the form 2122 // 2123 // X& X::operator=(X&) 2124 QualType ArgType = ClassType; 2125 QualType RetType = Context.getLValueReferenceType(ArgType); 2126 if (HasConstCopyAssignment) 2127 ArgType = ArgType.withConst(); 2128 ArgType = Context.getLValueReferenceType(ArgType); 2129 2130 // An implicitly-declared copy assignment operator is an inline public 2131 // member of its class. 2132 DeclarationName Name = 2133 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2134 CXXMethodDecl *CopyAssignment = 2135 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2136 Context.getFunctionType(RetType, &ArgType, 1, 2137 false, 0), 2138 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2139 CopyAssignment->setAccess(AS_public); 2140 CopyAssignment->setImplicit(); 2141 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2142 CopyAssignment->setCopyAssignment(true); 2143 2144 // Add the parameter to the operator. 2145 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2146 ClassDecl->getLocation(), 2147 /*IdentifierInfo=*/0, 2148 ArgType, /*DInfo=*/0, 2149 VarDecl::None, 0); 2150 CopyAssignment->setParams(Context, &FromParam, 1); 2151 2152 // Don't call addedAssignmentOperator. There is no way to distinguish an 2153 // implicit from an explicit assignment operator. 2154 ClassDecl->addDecl(CopyAssignment); 2155 } 2156 2157 if (!ClassDecl->hasUserDeclaredDestructor()) { 2158 // C++ [class.dtor]p2: 2159 // If a class has no user-declared destructor, a destructor is 2160 // declared implicitly. An implicitly-declared destructor is an 2161 // inline public member of its class. 2162 DeclarationName Name 2163 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2164 CXXDestructorDecl *Destructor 2165 = CXXDestructorDecl::Create(Context, ClassDecl, 2166 ClassDecl->getLocation(), Name, 2167 Context.getFunctionType(Context.VoidTy, 2168 0, 0, false, 0), 2169 /*isInline=*/true, 2170 /*isImplicitlyDeclared=*/true); 2171 Destructor->setAccess(AS_public); 2172 Destructor->setImplicit(); 2173 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2174 ClassDecl->addDecl(Destructor); 2175 } 2176} 2177 2178void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2179 Decl *D = TemplateD.getAs<Decl>(); 2180 if (!D) 2181 return; 2182 2183 TemplateParameterList *Params = 0; 2184 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2185 Params = Template->getTemplateParameters(); 2186 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2187 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2188 Params = PartialSpec->getTemplateParameters(); 2189 else 2190 return; 2191 2192 for (TemplateParameterList::iterator Param = Params->begin(), 2193 ParamEnd = Params->end(); 2194 Param != ParamEnd; ++Param) { 2195 NamedDecl *Named = cast<NamedDecl>(*Param); 2196 if (Named->getDeclName()) { 2197 S->AddDecl(DeclPtrTy::make(Named)); 2198 IdResolver.AddDecl(Named); 2199 } 2200 } 2201} 2202 2203/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2204/// parsing a top-level (non-nested) C++ class, and we are now 2205/// parsing those parts of the given Method declaration that could 2206/// not be parsed earlier (C++ [class.mem]p2), such as default 2207/// arguments. This action should enter the scope of the given 2208/// Method declaration as if we had just parsed the qualified method 2209/// name. However, it should not bring the parameters into scope; 2210/// that will be performed by ActOnDelayedCXXMethodParameter. 2211void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2212 if (!MethodD) 2213 return; 2214 2215 AdjustDeclIfTemplate(MethodD); 2216 2217 CXXScopeSpec SS; 2218 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2219 QualType ClassTy 2220 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2221 SS.setScopeRep( 2222 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2223 ActOnCXXEnterDeclaratorScope(S, SS); 2224} 2225 2226/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2227/// C++ method declaration. We're (re-)introducing the given 2228/// function parameter into scope for use in parsing later parts of 2229/// the method declaration. For example, we could see an 2230/// ActOnParamDefaultArgument event for this parameter. 2231void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2232 if (!ParamD) 2233 return; 2234 2235 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2236 2237 // If this parameter has an unparsed default argument, clear it out 2238 // to make way for the parsed default argument. 2239 if (Param->hasUnparsedDefaultArg()) 2240 Param->setDefaultArg(0); 2241 2242 S->AddDecl(DeclPtrTy::make(Param)); 2243 if (Param->getDeclName()) 2244 IdResolver.AddDecl(Param); 2245} 2246 2247/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2248/// processing the delayed method declaration for Method. The method 2249/// declaration is now considered finished. There may be a separate 2250/// ActOnStartOfFunctionDef action later (not necessarily 2251/// immediately!) for this method, if it was also defined inside the 2252/// class body. 2253void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2254 if (!MethodD) 2255 return; 2256 2257 AdjustDeclIfTemplate(MethodD); 2258 2259 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2260 CXXScopeSpec SS; 2261 QualType ClassTy 2262 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2263 SS.setScopeRep( 2264 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2265 ActOnCXXExitDeclaratorScope(S, SS); 2266 2267 // Now that we have our default arguments, check the constructor 2268 // again. It could produce additional diagnostics or affect whether 2269 // the class has implicitly-declared destructors, among other 2270 // things. 2271 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2272 CheckConstructor(Constructor); 2273 2274 // Check the default arguments, which we may have added. 2275 if (!Method->isInvalidDecl()) 2276 CheckCXXDefaultArguments(Method); 2277} 2278 2279/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2280/// the well-formedness of the constructor declarator @p D with type @p 2281/// R. If there are any errors in the declarator, this routine will 2282/// emit diagnostics and set the invalid bit to true. In any case, the type 2283/// will be updated to reflect a well-formed type for the constructor and 2284/// returned. 2285QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2286 FunctionDecl::StorageClass &SC) { 2287 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2288 2289 // C++ [class.ctor]p3: 2290 // A constructor shall not be virtual (10.3) or static (9.4). A 2291 // constructor can be invoked for a const, volatile or const 2292 // volatile object. A constructor shall not be declared const, 2293 // volatile, or const volatile (9.3.2). 2294 if (isVirtual) { 2295 if (!D.isInvalidType()) 2296 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2297 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2298 << SourceRange(D.getIdentifierLoc()); 2299 D.setInvalidType(); 2300 } 2301 if (SC == FunctionDecl::Static) { 2302 if (!D.isInvalidType()) 2303 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2304 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2305 << SourceRange(D.getIdentifierLoc()); 2306 D.setInvalidType(); 2307 SC = FunctionDecl::None; 2308 } 2309 2310 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2311 if (FTI.TypeQuals != 0) { 2312 if (FTI.TypeQuals & Qualifiers::Const) 2313 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2314 << "const" << SourceRange(D.getIdentifierLoc()); 2315 if (FTI.TypeQuals & Qualifiers::Volatile) 2316 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2317 << "volatile" << SourceRange(D.getIdentifierLoc()); 2318 if (FTI.TypeQuals & Qualifiers::Restrict) 2319 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2320 << "restrict" << SourceRange(D.getIdentifierLoc()); 2321 } 2322 2323 // Rebuild the function type "R" without any type qualifiers (in 2324 // case any of the errors above fired) and with "void" as the 2325 // return type, since constructors don't have return types. We 2326 // *always* have to do this, because GetTypeForDeclarator will 2327 // put in a result type of "int" when none was specified. 2328 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2329 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2330 Proto->getNumArgs(), 2331 Proto->isVariadic(), 0); 2332} 2333 2334/// CheckConstructor - Checks a fully-formed constructor for 2335/// well-formedness, issuing any diagnostics required. Returns true if 2336/// the constructor declarator is invalid. 2337void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2338 CXXRecordDecl *ClassDecl 2339 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2340 if (!ClassDecl) 2341 return Constructor->setInvalidDecl(); 2342 2343 // C++ [class.copy]p3: 2344 // A declaration of a constructor for a class X is ill-formed if 2345 // its first parameter is of type (optionally cv-qualified) X and 2346 // either there are no other parameters or else all other 2347 // parameters have default arguments. 2348 if (!Constructor->isInvalidDecl() && 2349 ((Constructor->getNumParams() == 1) || 2350 (Constructor->getNumParams() > 1 && 2351 Constructor->getParamDecl(1)->hasDefaultArg())) && 2352 Constructor->getTemplateSpecializationKind() 2353 != TSK_ImplicitInstantiation) { 2354 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2355 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2356 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2357 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2358 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2359 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2360 2361 // FIXME: Rather that making the constructor invalid, we should endeavor 2362 // to fix the type. 2363 Constructor->setInvalidDecl(); 2364 } 2365 } 2366 2367 // Notify the class that we've added a constructor. 2368 ClassDecl->addedConstructor(Context, Constructor); 2369} 2370 2371static inline bool 2372FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2373 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2374 FTI.ArgInfo[0].Param && 2375 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2376} 2377 2378/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2379/// the well-formednes of the destructor declarator @p D with type @p 2380/// R. If there are any errors in the declarator, this routine will 2381/// emit diagnostics and set the declarator to invalid. Even if this happens, 2382/// will be updated to reflect a well-formed type for the destructor and 2383/// returned. 2384QualType Sema::CheckDestructorDeclarator(Declarator &D, 2385 FunctionDecl::StorageClass& SC) { 2386 // C++ [class.dtor]p1: 2387 // [...] A typedef-name that names a class is a class-name 2388 // (7.1.3); however, a typedef-name that names a class shall not 2389 // be used as the identifier in the declarator for a destructor 2390 // declaration. 2391 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2392 if (isa<TypedefType>(DeclaratorType)) { 2393 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2394 << DeclaratorType; 2395 D.setInvalidType(); 2396 } 2397 2398 // C++ [class.dtor]p2: 2399 // A destructor is used to destroy objects of its class type. A 2400 // destructor takes no parameters, and no return type can be 2401 // specified for it (not even void). The address of a destructor 2402 // shall not be taken. A destructor shall not be static. A 2403 // destructor can be invoked for a const, volatile or const 2404 // volatile object. A destructor shall not be declared const, 2405 // volatile or const volatile (9.3.2). 2406 if (SC == FunctionDecl::Static) { 2407 if (!D.isInvalidType()) 2408 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2409 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2410 << SourceRange(D.getIdentifierLoc()); 2411 SC = FunctionDecl::None; 2412 D.setInvalidType(); 2413 } 2414 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2415 // Destructors don't have return types, but the parser will 2416 // happily parse something like: 2417 // 2418 // class X { 2419 // float ~X(); 2420 // }; 2421 // 2422 // The return type will be eliminated later. 2423 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2424 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2425 << SourceRange(D.getIdentifierLoc()); 2426 } 2427 2428 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2429 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2430 if (FTI.TypeQuals & Qualifiers::Const) 2431 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2432 << "const" << SourceRange(D.getIdentifierLoc()); 2433 if (FTI.TypeQuals & Qualifiers::Volatile) 2434 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2435 << "volatile" << SourceRange(D.getIdentifierLoc()); 2436 if (FTI.TypeQuals & Qualifiers::Restrict) 2437 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2438 << "restrict" << SourceRange(D.getIdentifierLoc()); 2439 D.setInvalidType(); 2440 } 2441 2442 // Make sure we don't have any parameters. 2443 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2444 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2445 2446 // Delete the parameters. 2447 FTI.freeArgs(); 2448 D.setInvalidType(); 2449 } 2450 2451 // Make sure the destructor isn't variadic. 2452 if (FTI.isVariadic) { 2453 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2454 D.setInvalidType(); 2455 } 2456 2457 // Rebuild the function type "R" without any type qualifiers or 2458 // parameters (in case any of the errors above fired) and with 2459 // "void" as the return type, since destructors don't have return 2460 // types. We *always* have to do this, because GetTypeForDeclarator 2461 // will put in a result type of "int" when none was specified. 2462 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2463} 2464 2465/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2466/// well-formednes of the conversion function declarator @p D with 2467/// type @p R. If there are any errors in the declarator, this routine 2468/// will emit diagnostics and return true. Otherwise, it will return 2469/// false. Either way, the type @p R will be updated to reflect a 2470/// well-formed type for the conversion operator. 2471void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2472 FunctionDecl::StorageClass& SC) { 2473 // C++ [class.conv.fct]p1: 2474 // Neither parameter types nor return type can be specified. The 2475 // type of a conversion function (8.3.5) is "function taking no 2476 // parameter returning conversion-type-id." 2477 if (SC == FunctionDecl::Static) { 2478 if (!D.isInvalidType()) 2479 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2480 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2481 << SourceRange(D.getIdentifierLoc()); 2482 D.setInvalidType(); 2483 SC = FunctionDecl::None; 2484 } 2485 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2486 // Conversion functions don't have return types, but the parser will 2487 // happily parse something like: 2488 // 2489 // class X { 2490 // float operator bool(); 2491 // }; 2492 // 2493 // The return type will be changed later anyway. 2494 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2495 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2496 << SourceRange(D.getIdentifierLoc()); 2497 } 2498 2499 // Make sure we don't have any parameters. 2500 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2501 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2502 2503 // Delete the parameters. 2504 D.getTypeObject(0).Fun.freeArgs(); 2505 D.setInvalidType(); 2506 } 2507 2508 // Make sure the conversion function isn't variadic. 2509 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2510 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2511 D.setInvalidType(); 2512 } 2513 2514 // C++ [class.conv.fct]p4: 2515 // The conversion-type-id shall not represent a function type nor 2516 // an array type. 2517 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2518 if (ConvType->isArrayType()) { 2519 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2520 ConvType = Context.getPointerType(ConvType); 2521 D.setInvalidType(); 2522 } else if (ConvType->isFunctionType()) { 2523 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2524 ConvType = Context.getPointerType(ConvType); 2525 D.setInvalidType(); 2526 } 2527 2528 // Rebuild the function type "R" without any parameters (in case any 2529 // of the errors above fired) and with the conversion type as the 2530 // return type. 2531 R = Context.getFunctionType(ConvType, 0, 0, false, 2532 R->getAs<FunctionProtoType>()->getTypeQuals()); 2533 2534 // C++0x explicit conversion operators. 2535 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2536 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2537 diag::warn_explicit_conversion_functions) 2538 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2539} 2540 2541/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2542/// the declaration of the given C++ conversion function. This routine 2543/// is responsible for recording the conversion function in the C++ 2544/// class, if possible. 2545Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2546 assert(Conversion && "Expected to receive a conversion function declaration"); 2547 2548 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2549 2550 // Make sure we aren't redeclaring the conversion function. 2551 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2552 2553 // C++ [class.conv.fct]p1: 2554 // [...] A conversion function is never used to convert a 2555 // (possibly cv-qualified) object to the (possibly cv-qualified) 2556 // same object type (or a reference to it), to a (possibly 2557 // cv-qualified) base class of that type (or a reference to it), 2558 // or to (possibly cv-qualified) void. 2559 // FIXME: Suppress this warning if the conversion function ends up being a 2560 // virtual function that overrides a virtual function in a base class. 2561 QualType ClassType 2562 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2563 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2564 ConvType = ConvTypeRef->getPointeeType(); 2565 if (ConvType->isRecordType()) { 2566 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2567 if (ConvType == ClassType) 2568 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2569 << ClassType; 2570 else if (IsDerivedFrom(ClassType, ConvType)) 2571 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2572 << ClassType << ConvType; 2573 } else if (ConvType->isVoidType()) { 2574 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2575 << ClassType << ConvType; 2576 } 2577 2578 if (Conversion->getPreviousDeclaration()) { 2579 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2580 if (FunctionTemplateDecl *ConversionTemplate 2581 = Conversion->getDescribedFunctionTemplate()) 2582 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2583 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2584 for (OverloadedFunctionDecl::function_iterator 2585 Conv = Conversions->function_begin(), 2586 ConvEnd = Conversions->function_end(); 2587 Conv != ConvEnd; ++Conv) { 2588 if (*Conv == ExpectedPrevDecl) { 2589 *Conv = Conversion; 2590 return DeclPtrTy::make(Conversion); 2591 } 2592 } 2593 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2594 } else if (FunctionTemplateDecl *ConversionTemplate 2595 = Conversion->getDescribedFunctionTemplate()) 2596 ClassDecl->addConversionFunction(ConversionTemplate); 2597 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2598 ClassDecl->addConversionFunction(Conversion); 2599 2600 return DeclPtrTy::make(Conversion); 2601} 2602 2603//===----------------------------------------------------------------------===// 2604// Namespace Handling 2605//===----------------------------------------------------------------------===// 2606 2607/// ActOnStartNamespaceDef - This is called at the start of a namespace 2608/// definition. 2609Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2610 SourceLocation IdentLoc, 2611 IdentifierInfo *II, 2612 SourceLocation LBrace) { 2613 NamespaceDecl *Namespc = 2614 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2615 Namespc->setLBracLoc(LBrace); 2616 2617 Scope *DeclRegionScope = NamespcScope->getParent(); 2618 2619 if (II) { 2620 // C++ [namespace.def]p2: 2621 // The identifier in an original-namespace-definition shall not have been 2622 // previously defined in the declarative region in which the 2623 // original-namespace-definition appears. The identifier in an 2624 // original-namespace-definition is the name of the namespace. Subsequently 2625 // in that declarative region, it is treated as an original-namespace-name. 2626 2627 NamedDecl *PrevDecl 2628 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, true); 2629 2630 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2631 // This is an extended namespace definition. 2632 // Attach this namespace decl to the chain of extended namespace 2633 // definitions. 2634 OrigNS->setNextNamespace(Namespc); 2635 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2636 2637 // Remove the previous declaration from the scope. 2638 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2639 IdResolver.RemoveDecl(OrigNS); 2640 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2641 } 2642 } else if (PrevDecl) { 2643 // This is an invalid name redefinition. 2644 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2645 << Namespc->getDeclName(); 2646 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2647 Namespc->setInvalidDecl(); 2648 // Continue on to push Namespc as current DeclContext and return it. 2649 } else if (II->isStr("std") && 2650 CurContext->getLookupContext()->isTranslationUnit()) { 2651 // This is the first "real" definition of the namespace "std", so update 2652 // our cache of the "std" namespace to point at this definition. 2653 if (StdNamespace) { 2654 // We had already defined a dummy namespace "std". Link this new 2655 // namespace definition to the dummy namespace "std". 2656 StdNamespace->setNextNamespace(Namespc); 2657 StdNamespace->setLocation(IdentLoc); 2658 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2659 } 2660 2661 // Make our StdNamespace cache point at the first real definition of the 2662 // "std" namespace. 2663 StdNamespace = Namespc; 2664 } 2665 2666 PushOnScopeChains(Namespc, DeclRegionScope); 2667 } else { 2668 // Anonymous namespaces. 2669 2670 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2671 // behaves as if it were replaced by 2672 // namespace unique { /* empty body */ } 2673 // using namespace unique; 2674 // namespace unique { namespace-body } 2675 // where all occurrences of 'unique' in a translation unit are 2676 // replaced by the same identifier and this identifier differs 2677 // from all other identifiers in the entire program. 2678 2679 // We just create the namespace with an empty name and then add an 2680 // implicit using declaration, just like the standard suggests. 2681 // 2682 // CodeGen enforces the "universally unique" aspect by giving all 2683 // declarations semantically contained within an anonymous 2684 // namespace internal linkage. 2685 2686 assert(Namespc->isAnonymousNamespace()); 2687 CurContext->addDecl(Namespc); 2688 2689 UsingDirectiveDecl* UD 2690 = UsingDirectiveDecl::Create(Context, CurContext, 2691 /* 'using' */ LBrace, 2692 /* 'namespace' */ SourceLocation(), 2693 /* qualifier */ SourceRange(), 2694 /* NNS */ NULL, 2695 /* identifier */ SourceLocation(), 2696 Namespc, 2697 /* Ancestor */ CurContext); 2698 UD->setImplicit(); 2699 CurContext->addDecl(UD); 2700 } 2701 2702 // Although we could have an invalid decl (i.e. the namespace name is a 2703 // redefinition), push it as current DeclContext and try to continue parsing. 2704 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2705 // for the namespace has the declarations that showed up in that particular 2706 // namespace definition. 2707 PushDeclContext(NamespcScope, Namespc); 2708 return DeclPtrTy::make(Namespc); 2709} 2710 2711/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2712/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2713void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2714 Decl *Dcl = D.getAs<Decl>(); 2715 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2716 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2717 Namespc->setRBracLoc(RBrace); 2718 PopDeclContext(); 2719} 2720 2721Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2722 SourceLocation UsingLoc, 2723 SourceLocation NamespcLoc, 2724 const CXXScopeSpec &SS, 2725 SourceLocation IdentLoc, 2726 IdentifierInfo *NamespcName, 2727 AttributeList *AttrList) { 2728 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2729 assert(NamespcName && "Invalid NamespcName."); 2730 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2731 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2732 2733 UsingDirectiveDecl *UDir = 0; 2734 2735 // Lookup namespace name. 2736 LookupResult R; 2737 LookupParsedName(R, S, &SS, NamespcName, LookupNamespaceName, false); 2738 if (R.isAmbiguous()) { 2739 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2740 return DeclPtrTy(); 2741 } 2742 if (!R.empty()) { 2743 NamedDecl *NS = R.getFoundDecl(); 2744 // FIXME: Namespace aliases! 2745 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2746 // C++ [namespace.udir]p1: 2747 // A using-directive specifies that the names in the nominated 2748 // namespace can be used in the scope in which the 2749 // using-directive appears after the using-directive. During 2750 // unqualified name lookup (3.4.1), the names appear as if they 2751 // were declared in the nearest enclosing namespace which 2752 // contains both the using-directive and the nominated 2753 // namespace. [Note: in this context, "contains" means "contains 2754 // directly or indirectly". ] 2755 2756 // Find enclosing context containing both using-directive and 2757 // nominated namespace. 2758 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2759 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2760 CommonAncestor = CommonAncestor->getParent(); 2761 2762 UDir = UsingDirectiveDecl::Create(Context, 2763 CurContext, UsingLoc, 2764 NamespcLoc, 2765 SS.getRange(), 2766 (NestedNameSpecifier *)SS.getScopeRep(), 2767 IdentLoc, 2768 cast<NamespaceDecl>(NS), 2769 CommonAncestor); 2770 PushUsingDirective(S, UDir); 2771 } else { 2772 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2773 } 2774 2775 // FIXME: We ignore attributes for now. 2776 delete AttrList; 2777 return DeclPtrTy::make(UDir); 2778} 2779 2780void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2781 // If scope has associated entity, then using directive is at namespace 2782 // or translation unit scope. We add UsingDirectiveDecls, into 2783 // it's lookup structure. 2784 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2785 Ctx->addDecl(UDir); 2786 else 2787 // Otherwise it is block-sope. using-directives will affect lookup 2788 // only to the end of scope. 2789 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2790} 2791 2792 2793Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2794 AccessSpecifier AS, 2795 SourceLocation UsingLoc, 2796 const CXXScopeSpec &SS, 2797 UnqualifiedId &Name, 2798 AttributeList *AttrList, 2799 bool IsTypeName) { 2800 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2801 2802 switch (Name.getKind()) { 2803 case UnqualifiedId::IK_Identifier: 2804 case UnqualifiedId::IK_OperatorFunctionId: 2805 case UnqualifiedId::IK_ConversionFunctionId: 2806 break; 2807 2808 case UnqualifiedId::IK_ConstructorName: 2809 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2810 << SS.getRange(); 2811 return DeclPtrTy(); 2812 2813 case UnqualifiedId::IK_DestructorName: 2814 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2815 << SS.getRange(); 2816 return DeclPtrTy(); 2817 2818 case UnqualifiedId::IK_TemplateId: 2819 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2820 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2821 return DeclPtrTy(); 2822 } 2823 2824 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2825 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, 2826 Name.getSourceRange().getBegin(), 2827 TargetName, AttrList, IsTypeName); 2828 if (UD) { 2829 PushOnScopeChains(UD, S); 2830 UD->setAccess(AS); 2831 } 2832 2833 return DeclPtrTy::make(UD); 2834} 2835 2836NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2837 const CXXScopeSpec &SS, 2838 SourceLocation IdentLoc, 2839 DeclarationName Name, 2840 AttributeList *AttrList, 2841 bool IsTypeName) { 2842 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2843 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2844 2845 // FIXME: We ignore attributes for now. 2846 delete AttrList; 2847 2848 if (SS.isEmpty()) { 2849 Diag(IdentLoc, diag::err_using_requires_qualname); 2850 return 0; 2851 } 2852 2853 NestedNameSpecifier *NNS = 2854 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2855 2856 DeclContext *LookupContext = computeDeclContext(SS); 2857 if (!LookupContext) { 2858 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2859 SS.getRange(), NNS, 2860 IdentLoc, Name, IsTypeName); 2861 } 2862 2863 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2864 // C++0x N2914 [namespace.udecl]p3: 2865 // A using-declaration used as a member-declaration shall refer to a member 2866 // of a base class of the class being defined, shall refer to a member of an 2867 // anonymous union that is a member of a base class of the class being 2868 // defined, or shall refer to an enumerator for an enumeration type that is 2869 // a member of a base class of the class being defined. 2870 2871 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2872 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2873 Diag(SS.getRange().getBegin(), 2874 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2875 << NNS << RD->getDeclName(); 2876 return 0; 2877 } 2878 } else { 2879 // C++0x N2914 [namespace.udecl]p8: 2880 // A using-declaration for a class member shall be a member-declaration. 2881 if (isa<CXXRecordDecl>(LookupContext)) { 2882 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2883 << SS.getRange(); 2884 return 0; 2885 } 2886 } 2887 2888 // Lookup target name. 2889 LookupResult R; 2890 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName); 2891 2892 if (R.empty()) { 2893 Diag(IdentLoc, diag::err_no_member) 2894 << Name << LookupContext << SS.getRange(); 2895 return 0; 2896 } 2897 2898 // FIXME: handle ambiguity? 2899 NamedDecl *ND = R.getAsSingleDecl(Context); 2900 2901 if (IsTypeName && !isa<TypeDecl>(ND)) { 2902 Diag(IdentLoc, diag::err_using_typename_non_type); 2903 return 0; 2904 } 2905 2906 // C++0x N2914 [namespace.udecl]p6: 2907 // A using-declaration shall not name a namespace. 2908 if (isa<NamespaceDecl>(ND)) { 2909 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2910 << SS.getRange(); 2911 return 0; 2912 } 2913 2914 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2915 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2916} 2917 2918/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2919/// is a namespace alias, returns the namespace it points to. 2920static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2921 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2922 return AD->getNamespace(); 2923 return dyn_cast_or_null<NamespaceDecl>(D); 2924} 2925 2926Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2927 SourceLocation NamespaceLoc, 2928 SourceLocation AliasLoc, 2929 IdentifierInfo *Alias, 2930 const CXXScopeSpec &SS, 2931 SourceLocation IdentLoc, 2932 IdentifierInfo *Ident) { 2933 2934 // Lookup the namespace name. 2935 LookupResult R; 2936 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false); 2937 2938 // Check if we have a previous declaration with the same name. 2939 if (NamedDecl *PrevDecl 2940 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) { 2941 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2942 // We already have an alias with the same name that points to the same 2943 // namespace, so don't create a new one. 2944 if (!R.isAmbiguous() && !R.empty() && 2945 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 2946 return DeclPtrTy(); 2947 } 2948 2949 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2950 diag::err_redefinition_different_kind; 2951 Diag(AliasLoc, DiagID) << Alias; 2952 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2953 return DeclPtrTy(); 2954 } 2955 2956 if (R.isAmbiguous()) { 2957 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2958 return DeclPtrTy(); 2959 } 2960 2961 if (R.empty()) { 2962 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2963 return DeclPtrTy(); 2964 } 2965 2966 NamespaceAliasDecl *AliasDecl = 2967 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2968 Alias, SS.getRange(), 2969 (NestedNameSpecifier *)SS.getScopeRep(), 2970 IdentLoc, R.getFoundDecl()); 2971 2972 CurContext->addDecl(AliasDecl); 2973 return DeclPtrTy::make(AliasDecl); 2974} 2975 2976void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2977 CXXConstructorDecl *Constructor) { 2978 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2979 !Constructor->isUsed()) && 2980 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2981 2982 CXXRecordDecl *ClassDecl 2983 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2984 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2985 2986 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 2987 Diag(CurrentLocation, diag::note_ctor_synthesized_at) 2988 << Context.getTagDeclType(ClassDecl); 2989 Constructor->setInvalidDecl(); 2990 } else { 2991 Constructor->setUsed(); 2992 } 2993 return; 2994} 2995 2996void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2997 CXXDestructorDecl *Destructor) { 2998 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2999 "DefineImplicitDestructor - call it for implicit default dtor"); 3000 3001 CXXRecordDecl *ClassDecl 3002 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 3003 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3004 // C++ [class.dtor] p5 3005 // Before the implicitly-declared default destructor for a class is 3006 // implicitly defined, all the implicitly-declared default destructors 3007 // for its base class and its non-static data members shall have been 3008 // implicitly defined. 3009 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3010 E = ClassDecl->bases_end(); Base != E; ++Base) { 3011 CXXRecordDecl *BaseClassDecl 3012 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3013 if (!BaseClassDecl->hasTrivialDestructor()) { 3014 if (CXXDestructorDecl *BaseDtor = 3015 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3016 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3017 else 3018 assert(false && 3019 "DefineImplicitDestructor - missing dtor in a base class"); 3020 } 3021 } 3022 3023 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3024 E = ClassDecl->field_end(); Field != E; ++Field) { 3025 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3026 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3027 FieldType = Array->getElementType(); 3028 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3029 CXXRecordDecl *FieldClassDecl 3030 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3031 if (!FieldClassDecl->hasTrivialDestructor()) { 3032 if (CXXDestructorDecl *FieldDtor = 3033 const_cast<CXXDestructorDecl*>( 3034 FieldClassDecl->getDestructor(Context))) 3035 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3036 else 3037 assert(false && 3038 "DefineImplicitDestructor - missing dtor in class of a data member"); 3039 } 3040 } 3041 } 3042 Destructor->setUsed(); 3043} 3044 3045void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3046 CXXMethodDecl *MethodDecl) { 3047 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3048 MethodDecl->getOverloadedOperator() == OO_Equal && 3049 !MethodDecl->isUsed()) && 3050 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3051 3052 CXXRecordDecl *ClassDecl 3053 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3054 3055 // C++[class.copy] p12 3056 // Before the implicitly-declared copy assignment operator for a class is 3057 // implicitly defined, all implicitly-declared copy assignment operators 3058 // for its direct base classes and its nonstatic data members shall have 3059 // been implicitly defined. 3060 bool err = false; 3061 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3062 E = ClassDecl->bases_end(); Base != E; ++Base) { 3063 CXXRecordDecl *BaseClassDecl 3064 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3065 if (CXXMethodDecl *BaseAssignOpMethod = 3066 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3067 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3068 } 3069 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3070 E = ClassDecl->field_end(); Field != E; ++Field) { 3071 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3072 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3073 FieldType = Array->getElementType(); 3074 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3075 CXXRecordDecl *FieldClassDecl 3076 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3077 if (CXXMethodDecl *FieldAssignOpMethod = 3078 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3079 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3080 } else if (FieldType->isReferenceType()) { 3081 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3082 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3083 Diag(Field->getLocation(), diag::note_declared_at); 3084 Diag(CurrentLocation, diag::note_first_required_here); 3085 err = true; 3086 } else if (FieldType.isConstQualified()) { 3087 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3088 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3089 Diag(Field->getLocation(), diag::note_declared_at); 3090 Diag(CurrentLocation, diag::note_first_required_here); 3091 err = true; 3092 } 3093 } 3094 if (!err) 3095 MethodDecl->setUsed(); 3096} 3097 3098CXXMethodDecl * 3099Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3100 CXXRecordDecl *ClassDecl) { 3101 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3102 QualType RHSType(LHSType); 3103 // If class's assignment operator argument is const/volatile qualified, 3104 // look for operator = (const/volatile B&). Otherwise, look for 3105 // operator = (B&). 3106 RHSType = Context.getCVRQualifiedType(RHSType, 3107 ParmDecl->getType().getCVRQualifiers()); 3108 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3109 LHSType, 3110 SourceLocation())); 3111 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3112 RHSType, 3113 SourceLocation())); 3114 Expr *Args[2] = { &*LHS, &*RHS }; 3115 OverloadCandidateSet CandidateSet; 3116 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3117 CandidateSet); 3118 OverloadCandidateSet::iterator Best; 3119 if (BestViableFunction(CandidateSet, 3120 ClassDecl->getLocation(), Best) == OR_Success) 3121 return cast<CXXMethodDecl>(Best->Function); 3122 assert(false && 3123 "getAssignOperatorMethod - copy assignment operator method not found"); 3124 return 0; 3125} 3126 3127void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3128 CXXConstructorDecl *CopyConstructor, 3129 unsigned TypeQuals) { 3130 assert((CopyConstructor->isImplicit() && 3131 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3132 !CopyConstructor->isUsed()) && 3133 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3134 3135 CXXRecordDecl *ClassDecl 3136 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3137 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3138 // C++ [class.copy] p209 3139 // Before the implicitly-declared copy constructor for a class is 3140 // implicitly defined, all the implicitly-declared copy constructors 3141 // for its base class and its non-static data members shall have been 3142 // implicitly defined. 3143 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3144 Base != ClassDecl->bases_end(); ++Base) { 3145 CXXRecordDecl *BaseClassDecl 3146 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3147 if (CXXConstructorDecl *BaseCopyCtor = 3148 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3149 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3150 } 3151 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3152 FieldEnd = ClassDecl->field_end(); 3153 Field != FieldEnd; ++Field) { 3154 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3155 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3156 FieldType = Array->getElementType(); 3157 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3158 CXXRecordDecl *FieldClassDecl 3159 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3160 if (CXXConstructorDecl *FieldCopyCtor = 3161 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3162 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3163 } 3164 } 3165 CopyConstructor->setUsed(); 3166} 3167 3168Sema::OwningExprResult 3169Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3170 CXXConstructorDecl *Constructor, 3171 MultiExprArg ExprArgs) { 3172 bool Elidable = false; 3173 3174 // C++ [class.copy]p15: 3175 // Whenever a temporary class object is copied using a copy constructor, and 3176 // this object and the copy have the same cv-unqualified type, an 3177 // implementation is permitted to treat the original and the copy as two 3178 // different ways of referring to the same object and not perform a copy at 3179 // all, even if the class copy constructor or destructor have side effects. 3180 3181 // FIXME: Is this enough? 3182 if (Constructor->isCopyConstructor(Context)) { 3183 Expr *E = ((Expr **)ExprArgs.get())[0]; 3184 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3185 E = BE->getSubExpr(); 3186 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3187 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3188 E = ICE->getSubExpr(); 3189 3190 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3191 Elidable = true; 3192 } 3193 3194 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3195 Elidable, move(ExprArgs)); 3196} 3197 3198/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3199/// including handling of its default argument expressions. 3200Sema::OwningExprResult 3201Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3202 CXXConstructorDecl *Constructor, bool Elidable, 3203 MultiExprArg ExprArgs) { 3204 unsigned NumExprs = ExprArgs.size(); 3205 Expr **Exprs = (Expr **)ExprArgs.release(); 3206 3207 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3208 Elidable, Exprs, NumExprs)); 3209} 3210 3211Sema::OwningExprResult 3212Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3213 QualType Ty, 3214 SourceLocation TyBeginLoc, 3215 MultiExprArg Args, 3216 SourceLocation RParenLoc) { 3217 unsigned NumExprs = Args.size(); 3218 Expr **Exprs = (Expr **)Args.release(); 3219 3220 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3221 TyBeginLoc, Exprs, 3222 NumExprs, RParenLoc)); 3223} 3224 3225 3226bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3227 CXXConstructorDecl *Constructor, 3228 MultiExprArg Exprs) { 3229 OwningExprResult TempResult = 3230 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3231 move(Exprs)); 3232 if (TempResult.isInvalid()) 3233 return true; 3234 3235 Expr *Temp = TempResult.takeAs<Expr>(); 3236 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3237 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3238 VD->setInit(Context, Temp); 3239 3240 return false; 3241} 3242 3243void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3244 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3245 DeclInitType->getAs<RecordType>()->getDecl()); 3246 if (!ClassDecl->hasTrivialDestructor()) 3247 if (CXXDestructorDecl *Destructor = 3248 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3249 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3250} 3251 3252/// AddCXXDirectInitializerToDecl - This action is called immediately after 3253/// ActOnDeclarator, when a C++ direct initializer is present. 3254/// e.g: "int x(1);" 3255void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3256 SourceLocation LParenLoc, 3257 MultiExprArg Exprs, 3258 SourceLocation *CommaLocs, 3259 SourceLocation RParenLoc) { 3260 unsigned NumExprs = Exprs.size(); 3261 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3262 Decl *RealDecl = Dcl.getAs<Decl>(); 3263 3264 // If there is no declaration, there was an error parsing it. Just ignore 3265 // the initializer. 3266 if (RealDecl == 0) 3267 return; 3268 3269 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3270 if (!VDecl) { 3271 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3272 RealDecl->setInvalidDecl(); 3273 return; 3274 } 3275 3276 // We will represent direct-initialization similarly to copy-initialization: 3277 // int x(1); -as-> int x = 1; 3278 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3279 // 3280 // Clients that want to distinguish between the two forms, can check for 3281 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3282 // A major benefit is that clients that don't particularly care about which 3283 // exactly form was it (like the CodeGen) can handle both cases without 3284 // special case code. 3285 3286 // If either the declaration has a dependent type or if any of the expressions 3287 // is type-dependent, we represent the initialization via a ParenListExpr for 3288 // later use during template instantiation. 3289 if (VDecl->getType()->isDependentType() || 3290 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3291 // Let clients know that initialization was done with a direct initializer. 3292 VDecl->setCXXDirectInitializer(true); 3293 3294 // Store the initialization expressions as a ParenListExpr. 3295 unsigned NumExprs = Exprs.size(); 3296 VDecl->setInit(Context, 3297 new (Context) ParenListExpr(Context, LParenLoc, 3298 (Expr **)Exprs.release(), 3299 NumExprs, RParenLoc)); 3300 return; 3301 } 3302 3303 3304 // C++ 8.5p11: 3305 // The form of initialization (using parentheses or '=') is generally 3306 // insignificant, but does matter when the entity being initialized has a 3307 // class type. 3308 QualType DeclInitType = VDecl->getType(); 3309 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3310 DeclInitType = Context.getBaseElementType(Array); 3311 3312 // FIXME: This isn't the right place to complete the type. 3313 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3314 diag::err_typecheck_decl_incomplete_type)) { 3315 VDecl->setInvalidDecl(); 3316 return; 3317 } 3318 3319 if (VDecl->getType()->isRecordType()) { 3320 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3321 3322 CXXConstructorDecl *Constructor 3323 = PerformInitializationByConstructor(DeclInitType, 3324 move(Exprs), 3325 VDecl->getLocation(), 3326 SourceRange(VDecl->getLocation(), 3327 RParenLoc), 3328 VDecl->getDeclName(), 3329 IK_Direct, 3330 ConstructorArgs); 3331 if (!Constructor) 3332 RealDecl->setInvalidDecl(); 3333 else { 3334 VDecl->setCXXDirectInitializer(true); 3335 if (InitializeVarWithConstructor(VDecl, Constructor, 3336 move_arg(ConstructorArgs))) 3337 RealDecl->setInvalidDecl(); 3338 FinalizeVarWithDestructor(VDecl, DeclInitType); 3339 } 3340 return; 3341 } 3342 3343 if (NumExprs > 1) { 3344 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3345 << SourceRange(VDecl->getLocation(), RParenLoc); 3346 RealDecl->setInvalidDecl(); 3347 return; 3348 } 3349 3350 // Let clients know that initialization was done with a direct initializer. 3351 VDecl->setCXXDirectInitializer(true); 3352 3353 assert(NumExprs == 1 && "Expected 1 expression"); 3354 // Set the init expression, handles conversions. 3355 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3356 /*DirectInit=*/true); 3357} 3358 3359/// \brief Add the applicable constructor candidates for an initialization 3360/// by constructor. 3361static void AddConstructorInitializationCandidates(Sema &SemaRef, 3362 QualType ClassType, 3363 Expr **Args, 3364 unsigned NumArgs, 3365 Sema::InitializationKind Kind, 3366 OverloadCandidateSet &CandidateSet) { 3367 // C++ [dcl.init]p14: 3368 // If the initialization is direct-initialization, or if it is 3369 // copy-initialization where the cv-unqualified version of the 3370 // source type is the same class as, or a derived class of, the 3371 // class of the destination, constructors are considered. The 3372 // applicable constructors are enumerated (13.3.1.3), and the 3373 // best one is chosen through overload resolution (13.3). The 3374 // constructor so selected is called to initialize the object, 3375 // with the initializer expression(s) as its argument(s). If no 3376 // constructor applies, or the overload resolution is ambiguous, 3377 // the initialization is ill-formed. 3378 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3379 assert(ClassRec && "Can only initialize a class type here"); 3380 3381 // FIXME: When we decide not to synthesize the implicitly-declared 3382 // constructors, we'll need to make them appear here. 3383 3384 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3385 DeclarationName ConstructorName 3386 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3387 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3388 DeclContext::lookup_const_iterator Con, ConEnd; 3389 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3390 Con != ConEnd; ++Con) { 3391 // Find the constructor (which may be a template). 3392 CXXConstructorDecl *Constructor = 0; 3393 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3394 if (ConstructorTmpl) 3395 Constructor 3396 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3397 else 3398 Constructor = cast<CXXConstructorDecl>(*Con); 3399 3400 if ((Kind == Sema::IK_Direct) || 3401 (Kind == Sema::IK_Copy && 3402 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3403 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3404 if (ConstructorTmpl) 3405 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3406 Args, NumArgs, CandidateSet); 3407 else 3408 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3409 } 3410 } 3411} 3412 3413/// \brief Attempt to perform initialization by constructor 3414/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3415/// copy-initialization. 3416/// 3417/// This routine determines whether initialization by constructor is possible, 3418/// but it does not emit any diagnostics in the case where the initialization 3419/// is ill-formed. 3420/// 3421/// \param ClassType the type of the object being initialized, which must have 3422/// class type. 3423/// 3424/// \param Args the arguments provided to initialize the object 3425/// 3426/// \param NumArgs the number of arguments provided to initialize the object 3427/// 3428/// \param Kind the type of initialization being performed 3429/// 3430/// \returns the constructor used to initialize the object, if successful. 3431/// Otherwise, emits a diagnostic and returns NULL. 3432CXXConstructorDecl * 3433Sema::TryInitializationByConstructor(QualType ClassType, 3434 Expr **Args, unsigned NumArgs, 3435 SourceLocation Loc, 3436 InitializationKind Kind) { 3437 // Build the overload candidate set 3438 OverloadCandidateSet CandidateSet; 3439 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3440 CandidateSet); 3441 3442 // Determine whether we found a constructor we can use. 3443 OverloadCandidateSet::iterator Best; 3444 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3445 case OR_Success: 3446 case OR_Deleted: 3447 // We found a constructor. Return it. 3448 return cast<CXXConstructorDecl>(Best->Function); 3449 3450 case OR_No_Viable_Function: 3451 case OR_Ambiguous: 3452 // Overload resolution failed. Return nothing. 3453 return 0; 3454 } 3455 3456 // Silence GCC warning 3457 return 0; 3458} 3459 3460/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3461/// may occur as part of direct-initialization or copy-initialization. 3462/// 3463/// \param ClassType the type of the object being initialized, which must have 3464/// class type. 3465/// 3466/// \param ArgsPtr the arguments provided to initialize the object 3467/// 3468/// \param Loc the source location where the initialization occurs 3469/// 3470/// \param Range the source range that covers the entire initialization 3471/// 3472/// \param InitEntity the name of the entity being initialized, if known 3473/// 3474/// \param Kind the type of initialization being performed 3475/// 3476/// \param ConvertedArgs a vector that will be filled in with the 3477/// appropriately-converted arguments to the constructor (if initialization 3478/// succeeded). 3479/// 3480/// \returns the constructor used to initialize the object, if successful. 3481/// Otherwise, emits a diagnostic and returns NULL. 3482CXXConstructorDecl * 3483Sema::PerformInitializationByConstructor(QualType ClassType, 3484 MultiExprArg ArgsPtr, 3485 SourceLocation Loc, SourceRange Range, 3486 DeclarationName InitEntity, 3487 InitializationKind Kind, 3488 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3489 3490 // Build the overload candidate set 3491 Expr **Args = (Expr **)ArgsPtr.get(); 3492 unsigned NumArgs = ArgsPtr.size(); 3493 OverloadCandidateSet CandidateSet; 3494 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3495 CandidateSet); 3496 3497 OverloadCandidateSet::iterator Best; 3498 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3499 case OR_Success: 3500 // We found a constructor. Break out so that we can convert the arguments 3501 // appropriately. 3502 break; 3503 3504 case OR_No_Viable_Function: 3505 if (InitEntity) 3506 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3507 << InitEntity << Range; 3508 else 3509 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3510 << ClassType << Range; 3511 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3512 return 0; 3513 3514 case OR_Ambiguous: 3515 if (InitEntity) 3516 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3517 else 3518 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3519 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3520 return 0; 3521 3522 case OR_Deleted: 3523 if (InitEntity) 3524 Diag(Loc, diag::err_ovl_deleted_init) 3525 << Best->Function->isDeleted() 3526 << InitEntity << Range; 3527 else 3528 Diag(Loc, diag::err_ovl_deleted_init) 3529 << Best->Function->isDeleted() 3530 << InitEntity << Range; 3531 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3532 return 0; 3533 } 3534 3535 // Convert the arguments, fill in default arguments, etc. 3536 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3537 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3538 return 0; 3539 3540 return Constructor; 3541} 3542 3543/// \brief Given a constructor and the set of arguments provided for the 3544/// constructor, convert the arguments and add any required default arguments 3545/// to form a proper call to this constructor. 3546/// 3547/// \returns true if an error occurred, false otherwise. 3548bool 3549Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3550 MultiExprArg ArgsPtr, 3551 SourceLocation Loc, 3552 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3553 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3554 unsigned NumArgs = ArgsPtr.size(); 3555 Expr **Args = (Expr **)ArgsPtr.get(); 3556 3557 const FunctionProtoType *Proto 3558 = Constructor->getType()->getAs<FunctionProtoType>(); 3559 assert(Proto && "Constructor without a prototype?"); 3560 unsigned NumArgsInProto = Proto->getNumArgs(); 3561 unsigned NumArgsToCheck = NumArgs; 3562 3563 // If too few arguments are available, we'll fill in the rest with defaults. 3564 if (NumArgs < NumArgsInProto) { 3565 NumArgsToCheck = NumArgsInProto; 3566 ConvertedArgs.reserve(NumArgsInProto); 3567 } else { 3568 ConvertedArgs.reserve(NumArgs); 3569 if (NumArgs > NumArgsInProto) 3570 NumArgsToCheck = NumArgsInProto; 3571 } 3572 3573 // Convert arguments 3574 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3575 QualType ProtoArgType = Proto->getArgType(i); 3576 3577 Expr *Arg; 3578 if (i < NumArgs) { 3579 Arg = Args[i]; 3580 3581 // Pass the argument. 3582 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3583 return true; 3584 3585 Args[i] = 0; 3586 } else { 3587 ParmVarDecl *Param = Constructor->getParamDecl(i); 3588 3589 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3590 if (DefArg.isInvalid()) 3591 return true; 3592 3593 Arg = DefArg.takeAs<Expr>(); 3594 } 3595 3596 ConvertedArgs.push_back(Arg); 3597 } 3598 3599 // If this is a variadic call, handle args passed through "...". 3600 if (Proto->isVariadic()) { 3601 // Promote the arguments (C99 6.5.2.2p7). 3602 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3603 Expr *Arg = Args[i]; 3604 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3605 return true; 3606 3607 ConvertedArgs.push_back(Arg); 3608 Args[i] = 0; 3609 } 3610 } 3611 3612 return false; 3613} 3614 3615/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3616/// determine whether they are reference-related, 3617/// reference-compatible, reference-compatible with added 3618/// qualification, or incompatible, for use in C++ initialization by 3619/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3620/// type, and the first type (T1) is the pointee type of the reference 3621/// type being initialized. 3622Sema::ReferenceCompareResult 3623Sema::CompareReferenceRelationship(SourceLocation Loc, 3624 QualType OrigT1, QualType OrigT2, 3625 bool& DerivedToBase) { 3626 assert(!OrigT1->isReferenceType() && 3627 "T1 must be the pointee type of the reference type"); 3628 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3629 3630 QualType T1 = Context.getCanonicalType(OrigT1); 3631 QualType T2 = Context.getCanonicalType(OrigT2); 3632 QualType UnqualT1 = T1.getUnqualifiedType(); 3633 QualType UnqualT2 = T2.getUnqualifiedType(); 3634 3635 // C++ [dcl.init.ref]p4: 3636 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3637 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3638 // T1 is a base class of T2. 3639 if (UnqualT1 == UnqualT2) 3640 DerivedToBase = false; 3641 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3642 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3643 IsDerivedFrom(UnqualT2, UnqualT1)) 3644 DerivedToBase = true; 3645 else 3646 return Ref_Incompatible; 3647 3648 // At this point, we know that T1 and T2 are reference-related (at 3649 // least). 3650 3651 // C++ [dcl.init.ref]p4: 3652 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3653 // reference-related to T2 and cv1 is the same cv-qualification 3654 // as, or greater cv-qualification than, cv2. For purposes of 3655 // overload resolution, cases for which cv1 is greater 3656 // cv-qualification than cv2 are identified as 3657 // reference-compatible with added qualification (see 13.3.3.2). 3658 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3659 return Ref_Compatible; 3660 else if (T1.isMoreQualifiedThan(T2)) 3661 return Ref_Compatible_With_Added_Qualification; 3662 else 3663 return Ref_Related; 3664} 3665 3666/// CheckReferenceInit - Check the initialization of a reference 3667/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3668/// the initializer (either a simple initializer or an initializer 3669/// list), and DeclType is the type of the declaration. When ICS is 3670/// non-null, this routine will compute the implicit conversion 3671/// sequence according to C++ [over.ics.ref] and will not produce any 3672/// diagnostics; when ICS is null, it will emit diagnostics when any 3673/// errors are found. Either way, a return value of true indicates 3674/// that there was a failure, a return value of false indicates that 3675/// the reference initialization succeeded. 3676/// 3677/// When @p SuppressUserConversions, user-defined conversions are 3678/// suppressed. 3679/// When @p AllowExplicit, we also permit explicit user-defined 3680/// conversion functions. 3681/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3682/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3683/// This is used when this is called from a C-style cast. 3684bool 3685Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3686 SourceLocation DeclLoc, 3687 bool SuppressUserConversions, 3688 bool AllowExplicit, bool ForceRValue, 3689 ImplicitConversionSequence *ICS, 3690 bool IgnoreBaseAccess) { 3691 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3692 3693 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3694 QualType T2 = Init->getType(); 3695 3696 // If the initializer is the address of an overloaded function, try 3697 // to resolve the overloaded function. If all goes well, T2 is the 3698 // type of the resulting function. 3699 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3700 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3701 ICS != 0); 3702 if (Fn) { 3703 // Since we're performing this reference-initialization for 3704 // real, update the initializer with the resulting function. 3705 if (!ICS) { 3706 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3707 return true; 3708 3709 Init = FixOverloadedFunctionReference(Init, Fn); 3710 } 3711 3712 T2 = Fn->getType(); 3713 } 3714 } 3715 3716 // Compute some basic properties of the types and the initializer. 3717 bool isRValRef = DeclType->isRValueReferenceType(); 3718 bool DerivedToBase = false; 3719 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3720 Init->isLvalue(Context); 3721 ReferenceCompareResult RefRelationship 3722 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3723 3724 // Most paths end in a failed conversion. 3725 if (ICS) 3726 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3727 3728 // C++ [dcl.init.ref]p5: 3729 // A reference to type "cv1 T1" is initialized by an expression 3730 // of type "cv2 T2" as follows: 3731 3732 // -- If the initializer expression 3733 3734 // Rvalue references cannot bind to lvalues (N2812). 3735 // There is absolutely no situation where they can. In particular, note that 3736 // this is ill-formed, even if B has a user-defined conversion to A&&: 3737 // B b; 3738 // A&& r = b; 3739 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3740 if (!ICS) 3741 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3742 << Init->getSourceRange(); 3743 return true; 3744 } 3745 3746 bool BindsDirectly = false; 3747 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3748 // reference-compatible with "cv2 T2," or 3749 // 3750 // Note that the bit-field check is skipped if we are just computing 3751 // the implicit conversion sequence (C++ [over.best.ics]p2). 3752 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3753 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3754 BindsDirectly = true; 3755 3756 if (ICS) { 3757 // C++ [over.ics.ref]p1: 3758 // When a parameter of reference type binds directly (8.5.3) 3759 // to an argument expression, the implicit conversion sequence 3760 // is the identity conversion, unless the argument expression 3761 // has a type that is a derived class of the parameter type, 3762 // in which case the implicit conversion sequence is a 3763 // derived-to-base Conversion (13.3.3.1). 3764 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3765 ICS->Standard.First = ICK_Identity; 3766 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3767 ICS->Standard.Third = ICK_Identity; 3768 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3769 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3770 ICS->Standard.ReferenceBinding = true; 3771 ICS->Standard.DirectBinding = true; 3772 ICS->Standard.RRefBinding = false; 3773 ICS->Standard.CopyConstructor = 0; 3774 3775 // Nothing more to do: the inaccessibility/ambiguity check for 3776 // derived-to-base conversions is suppressed when we're 3777 // computing the implicit conversion sequence (C++ 3778 // [over.best.ics]p2). 3779 return false; 3780 } else { 3781 // Perform the conversion. 3782 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3783 if (DerivedToBase) 3784 CK = CastExpr::CK_DerivedToBase; 3785 else if(CheckExceptionSpecCompatibility(Init, T1)) 3786 return true; 3787 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3788 } 3789 } 3790 3791 // -- has a class type (i.e., T2 is a class type) and can be 3792 // implicitly converted to an lvalue of type "cv3 T3," 3793 // where "cv1 T1" is reference-compatible with "cv3 T3" 3794 // 92) (this conversion is selected by enumerating the 3795 // applicable conversion functions (13.3.1.6) and choosing 3796 // the best one through overload resolution (13.3)), 3797 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3798 !RequireCompleteType(DeclLoc, T2, 0)) { 3799 CXXRecordDecl *T2RecordDecl 3800 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3801 3802 OverloadCandidateSet CandidateSet; 3803 OverloadedFunctionDecl *Conversions 3804 = T2RecordDecl->getVisibleConversionFunctions(); 3805 for (OverloadedFunctionDecl::function_iterator Func 3806 = Conversions->function_begin(); 3807 Func != Conversions->function_end(); ++Func) { 3808 FunctionTemplateDecl *ConvTemplate 3809 = dyn_cast<FunctionTemplateDecl>(*Func); 3810 CXXConversionDecl *Conv; 3811 if (ConvTemplate) 3812 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3813 else 3814 Conv = cast<CXXConversionDecl>(*Func); 3815 3816 // If the conversion function doesn't return a reference type, 3817 // it can't be considered for this conversion. 3818 if (Conv->getConversionType()->isLValueReferenceType() && 3819 (AllowExplicit || !Conv->isExplicit())) { 3820 if (ConvTemplate) 3821 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3822 CandidateSet); 3823 else 3824 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3825 } 3826 } 3827 3828 OverloadCandidateSet::iterator Best; 3829 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3830 case OR_Success: 3831 // This is a direct binding. 3832 BindsDirectly = true; 3833 3834 if (ICS) { 3835 // C++ [over.ics.ref]p1: 3836 // 3837 // [...] If the parameter binds directly to the result of 3838 // applying a conversion function to the argument 3839 // expression, the implicit conversion sequence is a 3840 // user-defined conversion sequence (13.3.3.1.2), with the 3841 // second standard conversion sequence either an identity 3842 // conversion or, if the conversion function returns an 3843 // entity of a type that is a derived class of the parameter 3844 // type, a derived-to-base Conversion. 3845 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3846 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3847 ICS->UserDefined.After = Best->FinalConversion; 3848 ICS->UserDefined.ConversionFunction = Best->Function; 3849 ICS->UserDefined.EllipsisConversion = false; 3850 assert(ICS->UserDefined.After.ReferenceBinding && 3851 ICS->UserDefined.After.DirectBinding && 3852 "Expected a direct reference binding!"); 3853 return false; 3854 } else { 3855 OwningExprResult InitConversion = 3856 BuildCXXCastArgument(DeclLoc, QualType(), 3857 CastExpr::CK_UserDefinedConversion, 3858 cast<CXXMethodDecl>(Best->Function), 3859 Owned(Init)); 3860 Init = InitConversion.takeAs<Expr>(); 3861 3862 if (CheckExceptionSpecCompatibility(Init, T1)) 3863 return true; 3864 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3865 /*isLvalue=*/true); 3866 } 3867 break; 3868 3869 case OR_Ambiguous: 3870 if (ICS) { 3871 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3872 Cand != CandidateSet.end(); ++Cand) 3873 if (Cand->Viable) 3874 ICS->ConversionFunctionSet.push_back(Cand->Function); 3875 break; 3876 } 3877 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3878 << Init->getSourceRange(); 3879 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3880 return true; 3881 3882 case OR_No_Viable_Function: 3883 case OR_Deleted: 3884 // There was no suitable conversion, or we found a deleted 3885 // conversion; continue with other checks. 3886 break; 3887 } 3888 } 3889 3890 if (BindsDirectly) { 3891 // C++ [dcl.init.ref]p4: 3892 // [...] In all cases where the reference-related or 3893 // reference-compatible relationship of two types is used to 3894 // establish the validity of a reference binding, and T1 is a 3895 // base class of T2, a program that necessitates such a binding 3896 // is ill-formed if T1 is an inaccessible (clause 11) or 3897 // ambiguous (10.2) base class of T2. 3898 // 3899 // Note that we only check this condition when we're allowed to 3900 // complain about errors, because we should not be checking for 3901 // ambiguity (or inaccessibility) unless the reference binding 3902 // actually happens. 3903 if (DerivedToBase) 3904 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3905 Init->getSourceRange(), 3906 IgnoreBaseAccess); 3907 else 3908 return false; 3909 } 3910 3911 // -- Otherwise, the reference shall be to a non-volatile const 3912 // type (i.e., cv1 shall be const), or the reference shall be an 3913 // rvalue reference and the initializer expression shall be an rvalue. 3914 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3915 if (!ICS) 3916 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3917 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3918 << T2 << Init->getSourceRange(); 3919 return true; 3920 } 3921 3922 // -- If the initializer expression is an rvalue, with T2 a 3923 // class type, and "cv1 T1" is reference-compatible with 3924 // "cv2 T2," the reference is bound in one of the 3925 // following ways (the choice is implementation-defined): 3926 // 3927 // -- The reference is bound to the object represented by 3928 // the rvalue (see 3.10) or to a sub-object within that 3929 // object. 3930 // 3931 // -- A temporary of type "cv1 T2" [sic] is created, and 3932 // a constructor is called to copy the entire rvalue 3933 // object into the temporary. The reference is bound to 3934 // the temporary or to a sub-object within the 3935 // temporary. 3936 // 3937 // The constructor that would be used to make the copy 3938 // shall be callable whether or not the copy is actually 3939 // done. 3940 // 3941 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3942 // freedom, so we will always take the first option and never build 3943 // a temporary in this case. FIXME: We will, however, have to check 3944 // for the presence of a copy constructor in C++98/03 mode. 3945 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3946 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3947 if (ICS) { 3948 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3949 ICS->Standard.First = ICK_Identity; 3950 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3951 ICS->Standard.Third = ICK_Identity; 3952 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3953 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3954 ICS->Standard.ReferenceBinding = true; 3955 ICS->Standard.DirectBinding = false; 3956 ICS->Standard.RRefBinding = isRValRef; 3957 ICS->Standard.CopyConstructor = 0; 3958 } else { 3959 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3960 if (DerivedToBase) 3961 CK = CastExpr::CK_DerivedToBase; 3962 else if(CheckExceptionSpecCompatibility(Init, T1)) 3963 return true; 3964 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 3965 } 3966 return false; 3967 } 3968 3969 // -- Otherwise, a temporary of type "cv1 T1" is created and 3970 // initialized from the initializer expression using the 3971 // rules for a non-reference copy initialization (8.5). The 3972 // reference is then bound to the temporary. If T1 is 3973 // reference-related to T2, cv1 must be the same 3974 // cv-qualification as, or greater cv-qualification than, 3975 // cv2; otherwise, the program is ill-formed. 3976 if (RefRelationship == Ref_Related) { 3977 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3978 // we would be reference-compatible or reference-compatible with 3979 // added qualification. But that wasn't the case, so the reference 3980 // initialization fails. 3981 if (!ICS) 3982 Diag(DeclLoc, diag::err_reference_init_drops_quals) 3983 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3984 << T2 << Init->getSourceRange(); 3985 return true; 3986 } 3987 3988 // If at least one of the types is a class type, the types are not 3989 // related, and we aren't allowed any user conversions, the 3990 // reference binding fails. This case is important for breaking 3991 // recursion, since TryImplicitConversion below will attempt to 3992 // create a temporary through the use of a copy constructor. 3993 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 3994 (T1->isRecordType() || T2->isRecordType())) { 3995 if (!ICS) 3996 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 3997 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 3998 return true; 3999 } 4000 4001 // Actually try to convert the initializer to T1. 4002 if (ICS) { 4003 // C++ [over.ics.ref]p2: 4004 // 4005 // When a parameter of reference type is not bound directly to 4006 // an argument expression, the conversion sequence is the one 4007 // required to convert the argument expression to the 4008 // underlying type of the reference according to 4009 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4010 // to copy-initializing a temporary of the underlying type with 4011 // the argument expression. Any difference in top-level 4012 // cv-qualification is subsumed by the initialization itself 4013 // and does not constitute a conversion. 4014 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4015 /*AllowExplicit=*/false, 4016 /*ForceRValue=*/false, 4017 /*InOverloadResolution=*/false); 4018 4019 // Of course, that's still a reference binding. 4020 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4021 ICS->Standard.ReferenceBinding = true; 4022 ICS->Standard.RRefBinding = isRValRef; 4023 } else if (ICS->ConversionKind == 4024 ImplicitConversionSequence::UserDefinedConversion) { 4025 ICS->UserDefined.After.ReferenceBinding = true; 4026 ICS->UserDefined.After.RRefBinding = isRValRef; 4027 } 4028 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4029 } else { 4030 ImplicitConversionSequence Conversions; 4031 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4032 false, false, 4033 Conversions); 4034 if (badConversion) { 4035 if ((Conversions.ConversionKind == 4036 ImplicitConversionSequence::BadConversion) 4037 && !Conversions.ConversionFunctionSet.empty()) { 4038 Diag(DeclLoc, 4039 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4040 for (int j = Conversions.ConversionFunctionSet.size()-1; 4041 j >= 0; j--) { 4042 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4043 Diag(Func->getLocation(), diag::err_ovl_candidate); 4044 } 4045 } 4046 else { 4047 if (isRValRef) 4048 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4049 << Init->getSourceRange(); 4050 else 4051 Diag(DeclLoc, diag::err_invalid_initialization) 4052 << DeclType << Init->getType() << Init->getSourceRange(); 4053 } 4054 } 4055 return badConversion; 4056 } 4057} 4058 4059/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4060/// of this overloaded operator is well-formed. If so, returns false; 4061/// otherwise, emits appropriate diagnostics and returns true. 4062bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4063 assert(FnDecl && FnDecl->isOverloadedOperator() && 4064 "Expected an overloaded operator declaration"); 4065 4066 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4067 4068 // C++ [over.oper]p5: 4069 // The allocation and deallocation functions, operator new, 4070 // operator new[], operator delete and operator delete[], are 4071 // described completely in 3.7.3. The attributes and restrictions 4072 // found in the rest of this subclause do not apply to them unless 4073 // explicitly stated in 3.7.3. 4074 // FIXME: Write a separate routine for checking this. For now, just allow it. 4075 if (Op == OO_Delete || Op == OO_Array_Delete) 4076 return false; 4077 4078 if (Op == OO_New || Op == OO_Array_New) { 4079 bool ret = false; 4080 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4081 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4082 QualType T = Context.getCanonicalType((*Param)->getType()); 4083 if (!T->isDependentType() && SizeTy != T) { 4084 Diag(FnDecl->getLocation(), 4085 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4086 << SizeTy; 4087 ret = true; 4088 } 4089 } 4090 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4091 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4092 return Diag(FnDecl->getLocation(), 4093 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4094 << static_cast<QualType>(Context.VoidPtrTy); 4095 return ret; 4096 } 4097 4098 // C++ [over.oper]p6: 4099 // An operator function shall either be a non-static member 4100 // function or be a non-member function and have at least one 4101 // parameter whose type is a class, a reference to a class, an 4102 // enumeration, or a reference to an enumeration. 4103 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4104 if (MethodDecl->isStatic()) 4105 return Diag(FnDecl->getLocation(), 4106 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4107 } else { 4108 bool ClassOrEnumParam = false; 4109 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4110 ParamEnd = FnDecl->param_end(); 4111 Param != ParamEnd; ++Param) { 4112 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4113 if (ParamType->isDependentType() || ParamType->isRecordType() || 4114 ParamType->isEnumeralType()) { 4115 ClassOrEnumParam = true; 4116 break; 4117 } 4118 } 4119 4120 if (!ClassOrEnumParam) 4121 return Diag(FnDecl->getLocation(), 4122 diag::err_operator_overload_needs_class_or_enum) 4123 << FnDecl->getDeclName(); 4124 } 4125 4126 // C++ [over.oper]p8: 4127 // An operator function cannot have default arguments (8.3.6), 4128 // except where explicitly stated below. 4129 // 4130 // Only the function-call operator allows default arguments 4131 // (C++ [over.call]p1). 4132 if (Op != OO_Call) { 4133 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4134 Param != FnDecl->param_end(); ++Param) { 4135 if ((*Param)->hasUnparsedDefaultArg()) 4136 return Diag((*Param)->getLocation(), 4137 diag::err_operator_overload_default_arg) 4138 << FnDecl->getDeclName(); 4139 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4140 return Diag((*Param)->getLocation(), 4141 diag::err_operator_overload_default_arg) 4142 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4143 } 4144 } 4145 4146 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4147 { false, false, false } 4148#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4149 , { Unary, Binary, MemberOnly } 4150#include "clang/Basic/OperatorKinds.def" 4151 }; 4152 4153 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4154 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4155 bool MustBeMemberOperator = OperatorUses[Op][2]; 4156 4157 // C++ [over.oper]p8: 4158 // [...] Operator functions cannot have more or fewer parameters 4159 // than the number required for the corresponding operator, as 4160 // described in the rest of this subclause. 4161 unsigned NumParams = FnDecl->getNumParams() 4162 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4163 if (Op != OO_Call && 4164 ((NumParams == 1 && !CanBeUnaryOperator) || 4165 (NumParams == 2 && !CanBeBinaryOperator) || 4166 (NumParams < 1) || (NumParams > 2))) { 4167 // We have the wrong number of parameters. 4168 unsigned ErrorKind; 4169 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4170 ErrorKind = 2; // 2 -> unary or binary. 4171 } else if (CanBeUnaryOperator) { 4172 ErrorKind = 0; // 0 -> unary 4173 } else { 4174 assert(CanBeBinaryOperator && 4175 "All non-call overloaded operators are unary or binary!"); 4176 ErrorKind = 1; // 1 -> binary 4177 } 4178 4179 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4180 << FnDecl->getDeclName() << NumParams << ErrorKind; 4181 } 4182 4183 // Overloaded operators other than operator() cannot be variadic. 4184 if (Op != OO_Call && 4185 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4186 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4187 << FnDecl->getDeclName(); 4188 } 4189 4190 // Some operators must be non-static member functions. 4191 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4192 return Diag(FnDecl->getLocation(), 4193 diag::err_operator_overload_must_be_member) 4194 << FnDecl->getDeclName(); 4195 } 4196 4197 // C++ [over.inc]p1: 4198 // The user-defined function called operator++ implements the 4199 // prefix and postfix ++ operator. If this function is a member 4200 // function with no parameters, or a non-member function with one 4201 // parameter of class or enumeration type, it defines the prefix 4202 // increment operator ++ for objects of that type. If the function 4203 // is a member function with one parameter (which shall be of type 4204 // int) or a non-member function with two parameters (the second 4205 // of which shall be of type int), it defines the postfix 4206 // increment operator ++ for objects of that type. 4207 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4208 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4209 bool ParamIsInt = false; 4210 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4211 ParamIsInt = BT->getKind() == BuiltinType::Int; 4212 4213 if (!ParamIsInt) 4214 return Diag(LastParam->getLocation(), 4215 diag::err_operator_overload_post_incdec_must_be_int) 4216 << LastParam->getType() << (Op == OO_MinusMinus); 4217 } 4218 4219 // Notify the class if it got an assignment operator. 4220 if (Op == OO_Equal) { 4221 // Would have returned earlier otherwise. 4222 assert(isa<CXXMethodDecl>(FnDecl) && 4223 "Overloaded = not member, but not filtered."); 4224 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4225 Method->getParent()->addedAssignmentOperator(Context, Method); 4226 } 4227 4228 return false; 4229} 4230 4231/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4232/// linkage specification, including the language and (if present) 4233/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4234/// the location of the language string literal, which is provided 4235/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4236/// the '{' brace. Otherwise, this linkage specification does not 4237/// have any braces. 4238Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4239 SourceLocation ExternLoc, 4240 SourceLocation LangLoc, 4241 const char *Lang, 4242 unsigned StrSize, 4243 SourceLocation LBraceLoc) { 4244 LinkageSpecDecl::LanguageIDs Language; 4245 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4246 Language = LinkageSpecDecl::lang_c; 4247 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4248 Language = LinkageSpecDecl::lang_cxx; 4249 else { 4250 Diag(LangLoc, diag::err_bad_language); 4251 return DeclPtrTy(); 4252 } 4253 4254 // FIXME: Add all the various semantics of linkage specifications 4255 4256 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4257 LangLoc, Language, 4258 LBraceLoc.isValid()); 4259 CurContext->addDecl(D); 4260 PushDeclContext(S, D); 4261 return DeclPtrTy::make(D); 4262} 4263 4264/// ActOnFinishLinkageSpecification - Completely the definition of 4265/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4266/// valid, it's the position of the closing '}' brace in a linkage 4267/// specification that uses braces. 4268Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4269 DeclPtrTy LinkageSpec, 4270 SourceLocation RBraceLoc) { 4271 if (LinkageSpec) 4272 PopDeclContext(); 4273 return LinkageSpec; 4274} 4275 4276/// \brief Perform semantic analysis for the variable declaration that 4277/// occurs within a C++ catch clause, returning the newly-created 4278/// variable. 4279VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4280 DeclaratorInfo *DInfo, 4281 IdentifierInfo *Name, 4282 SourceLocation Loc, 4283 SourceRange Range) { 4284 bool Invalid = false; 4285 4286 // Arrays and functions decay. 4287 if (ExDeclType->isArrayType()) 4288 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4289 else if (ExDeclType->isFunctionType()) 4290 ExDeclType = Context.getPointerType(ExDeclType); 4291 4292 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4293 // The exception-declaration shall not denote a pointer or reference to an 4294 // incomplete type, other than [cv] void*. 4295 // N2844 forbids rvalue references. 4296 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4297 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4298 Invalid = true; 4299 } 4300 4301 QualType BaseType = ExDeclType; 4302 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4303 unsigned DK = diag::err_catch_incomplete; 4304 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4305 BaseType = Ptr->getPointeeType(); 4306 Mode = 1; 4307 DK = diag::err_catch_incomplete_ptr; 4308 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4309 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4310 BaseType = Ref->getPointeeType(); 4311 Mode = 2; 4312 DK = diag::err_catch_incomplete_ref; 4313 } 4314 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4315 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4316 Invalid = true; 4317 4318 if (!Invalid && !ExDeclType->isDependentType() && 4319 RequireNonAbstractType(Loc, ExDeclType, 4320 diag::err_abstract_type_in_decl, 4321 AbstractVariableType)) 4322 Invalid = true; 4323 4324 // FIXME: Need to test for ability to copy-construct and destroy the 4325 // exception variable. 4326 4327 // FIXME: Need to check for abstract classes. 4328 4329 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4330 Name, ExDeclType, DInfo, VarDecl::None); 4331 4332 if (Invalid) 4333 ExDecl->setInvalidDecl(); 4334 4335 return ExDecl; 4336} 4337 4338/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4339/// handler. 4340Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4341 DeclaratorInfo *DInfo = 0; 4342 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4343 4344 bool Invalid = D.isInvalidType(); 4345 IdentifierInfo *II = D.getIdentifier(); 4346 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4347 // The scope should be freshly made just for us. There is just no way 4348 // it contains any previous declaration. 4349 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4350 if (PrevDecl->isTemplateParameter()) { 4351 // Maybe we will complain about the shadowed template parameter. 4352 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4353 } 4354 } 4355 4356 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4357 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4358 << D.getCXXScopeSpec().getRange(); 4359 Invalid = true; 4360 } 4361 4362 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4363 D.getIdentifier(), 4364 D.getIdentifierLoc(), 4365 D.getDeclSpec().getSourceRange()); 4366 4367 if (Invalid) 4368 ExDecl->setInvalidDecl(); 4369 4370 // Add the exception declaration into this scope. 4371 if (II) 4372 PushOnScopeChains(ExDecl, S); 4373 else 4374 CurContext->addDecl(ExDecl); 4375 4376 ProcessDeclAttributes(S, ExDecl, D); 4377 return DeclPtrTy::make(ExDecl); 4378} 4379 4380Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4381 ExprArg assertexpr, 4382 ExprArg assertmessageexpr) { 4383 Expr *AssertExpr = (Expr *)assertexpr.get(); 4384 StringLiteral *AssertMessage = 4385 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4386 4387 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4388 llvm::APSInt Value(32); 4389 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4390 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4391 AssertExpr->getSourceRange(); 4392 return DeclPtrTy(); 4393 } 4394 4395 if (Value == 0) { 4396 std::string str(AssertMessage->getStrData(), 4397 AssertMessage->getByteLength()); 4398 Diag(AssertLoc, diag::err_static_assert_failed) 4399 << str << AssertExpr->getSourceRange(); 4400 } 4401 } 4402 4403 assertexpr.release(); 4404 assertmessageexpr.release(); 4405 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4406 AssertExpr, AssertMessage); 4407 4408 CurContext->addDecl(Decl); 4409 return DeclPtrTy::make(Decl); 4410} 4411 4412/// Handle a friend type declaration. This works in tandem with 4413/// ActOnTag. 4414/// 4415/// Notes on friend class templates: 4416/// 4417/// We generally treat friend class declarations as if they were 4418/// declaring a class. So, for example, the elaborated type specifier 4419/// in a friend declaration is required to obey the restrictions of a 4420/// class-head (i.e. no typedefs in the scope chain), template 4421/// parameters are required to match up with simple template-ids, &c. 4422/// However, unlike when declaring a template specialization, it's 4423/// okay to refer to a template specialization without an empty 4424/// template parameter declaration, e.g. 4425/// friend class A<T>::B<unsigned>; 4426/// We permit this as a special case; if there are any template 4427/// parameters present at all, require proper matching, i.e. 4428/// template <> template <class T> friend class A<int>::B; 4429Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4430 MultiTemplateParamsArg TempParams) { 4431 SourceLocation Loc = DS.getSourceRange().getBegin(); 4432 4433 assert(DS.isFriendSpecified()); 4434 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4435 4436 // Try to convert the decl specifier to a type. This works for 4437 // friend templates because ActOnTag never produces a ClassTemplateDecl 4438 // for a TUK_Friend. 4439 Declarator TheDeclarator(DS, Declarator::MemberContext); 4440 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4441 if (TheDeclarator.isInvalidType()) 4442 return DeclPtrTy(); 4443 4444 // This is definitely an error in C++98. It's probably meant to 4445 // be forbidden in C++0x, too, but the specification is just 4446 // poorly written. 4447 // 4448 // The problem is with declarations like the following: 4449 // template <T> friend A<T>::foo; 4450 // where deciding whether a class C is a friend or not now hinges 4451 // on whether there exists an instantiation of A that causes 4452 // 'foo' to equal C. There are restrictions on class-heads 4453 // (which we declare (by fiat) elaborated friend declarations to 4454 // be) that makes this tractable. 4455 // 4456 // FIXME: handle "template <> friend class A<T>;", which 4457 // is possibly well-formed? Who even knows? 4458 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4459 Diag(Loc, diag::err_tagless_friend_type_template) 4460 << DS.getSourceRange(); 4461 return DeclPtrTy(); 4462 } 4463 4464 // C++ [class.friend]p2: 4465 // An elaborated-type-specifier shall be used in a friend declaration 4466 // for a class.* 4467 // * The class-key of the elaborated-type-specifier is required. 4468 // This is one of the rare places in Clang where it's legitimate to 4469 // ask about the "spelling" of the type. 4470 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4471 // If we evaluated the type to a record type, suggest putting 4472 // a tag in front. 4473 if (const RecordType *RT = T->getAs<RecordType>()) { 4474 RecordDecl *RD = RT->getDecl(); 4475 4476 std::string InsertionText = std::string(" ") + RD->getKindName(); 4477 4478 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4479 << (unsigned) RD->getTagKind() 4480 << T 4481 << SourceRange(DS.getFriendSpecLoc()) 4482 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4483 InsertionText); 4484 return DeclPtrTy(); 4485 }else { 4486 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4487 << DS.getSourceRange(); 4488 return DeclPtrTy(); 4489 } 4490 } 4491 4492 // Enum types cannot be friends. 4493 if (T->getAs<EnumType>()) { 4494 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4495 << SourceRange(DS.getFriendSpecLoc()); 4496 return DeclPtrTy(); 4497 } 4498 4499 // C++98 [class.friend]p1: A friend of a class is a function 4500 // or class that is not a member of the class . . . 4501 // But that's a silly restriction which nobody implements for 4502 // inner classes, and C++0x removes it anyway, so we only report 4503 // this (as a warning) if we're being pedantic. 4504 if (!getLangOptions().CPlusPlus0x) 4505 if (const RecordType *RT = T->getAs<RecordType>()) 4506 if (RT->getDecl()->getDeclContext() == CurContext) 4507 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4508 4509 Decl *D; 4510 if (TempParams.size()) 4511 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4512 TempParams.size(), 4513 (TemplateParameterList**) TempParams.release(), 4514 T.getTypePtr(), 4515 DS.getFriendSpecLoc()); 4516 else 4517 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4518 DS.getFriendSpecLoc()); 4519 D->setAccess(AS_public); 4520 CurContext->addDecl(D); 4521 4522 return DeclPtrTy::make(D); 4523} 4524 4525Sema::DeclPtrTy 4526Sema::ActOnFriendFunctionDecl(Scope *S, 4527 Declarator &D, 4528 bool IsDefinition, 4529 MultiTemplateParamsArg TemplateParams) { 4530 const DeclSpec &DS = D.getDeclSpec(); 4531 4532 assert(DS.isFriendSpecified()); 4533 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4534 4535 SourceLocation Loc = D.getIdentifierLoc(); 4536 DeclaratorInfo *DInfo = 0; 4537 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4538 4539 // C++ [class.friend]p1 4540 // A friend of a class is a function or class.... 4541 // Note that this sees through typedefs, which is intended. 4542 // It *doesn't* see through dependent types, which is correct 4543 // according to [temp.arg.type]p3: 4544 // If a declaration acquires a function type through a 4545 // type dependent on a template-parameter and this causes 4546 // a declaration that does not use the syntactic form of a 4547 // function declarator to have a function type, the program 4548 // is ill-formed. 4549 if (!T->isFunctionType()) { 4550 Diag(Loc, diag::err_unexpected_friend); 4551 4552 // It might be worthwhile to try to recover by creating an 4553 // appropriate declaration. 4554 return DeclPtrTy(); 4555 } 4556 4557 // C++ [namespace.memdef]p3 4558 // - If a friend declaration in a non-local class first declares a 4559 // class or function, the friend class or function is a member 4560 // of the innermost enclosing namespace. 4561 // - The name of the friend is not found by simple name lookup 4562 // until a matching declaration is provided in that namespace 4563 // scope (either before or after the class declaration granting 4564 // friendship). 4565 // - If a friend function is called, its name may be found by the 4566 // name lookup that considers functions from namespaces and 4567 // classes associated with the types of the function arguments. 4568 // - When looking for a prior declaration of a class or a function 4569 // declared as a friend, scopes outside the innermost enclosing 4570 // namespace scope are not considered. 4571 4572 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4573 DeclarationName Name = GetNameForDeclarator(D); 4574 assert(Name); 4575 4576 // The context we found the declaration in, or in which we should 4577 // create the declaration. 4578 DeclContext *DC; 4579 4580 // FIXME: handle local classes 4581 4582 // Recover from invalid scope qualifiers as if they just weren't there. 4583 NamedDecl *PrevDecl = 0; 4584 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4585 // FIXME: RequireCompleteDeclContext 4586 DC = computeDeclContext(ScopeQual); 4587 4588 // FIXME: handle dependent contexts 4589 if (!DC) return DeclPtrTy(); 4590 4591 LookupResult R; 4592 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4593 PrevDecl = R.getAsSingleDecl(Context); 4594 4595 // If searching in that context implicitly found a declaration in 4596 // a different context, treat it like it wasn't found at all. 4597 // TODO: better diagnostics for this case. Suggesting the right 4598 // qualified scope would be nice... 4599 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4600 D.setInvalidType(); 4601 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4602 return DeclPtrTy(); 4603 } 4604 4605 // C++ [class.friend]p1: A friend of a class is a function or 4606 // class that is not a member of the class . . . 4607 if (DC->Equals(CurContext)) 4608 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4609 4610 // Otherwise walk out to the nearest namespace scope looking for matches. 4611 } else { 4612 // TODO: handle local class contexts. 4613 4614 DC = CurContext; 4615 while (true) { 4616 // Skip class contexts. If someone can cite chapter and verse 4617 // for this behavior, that would be nice --- it's what GCC and 4618 // EDG do, and it seems like a reasonable intent, but the spec 4619 // really only says that checks for unqualified existing 4620 // declarations should stop at the nearest enclosing namespace, 4621 // not that they should only consider the nearest enclosing 4622 // namespace. 4623 while (DC->isRecord()) 4624 DC = DC->getParent(); 4625 4626 LookupResult R; 4627 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4628 PrevDecl = R.getAsSingleDecl(Context); 4629 4630 // TODO: decide what we think about using declarations. 4631 if (PrevDecl) 4632 break; 4633 4634 if (DC->isFileContext()) break; 4635 DC = DC->getParent(); 4636 } 4637 4638 // C++ [class.friend]p1: A friend of a class is a function or 4639 // class that is not a member of the class . . . 4640 // C++0x changes this for both friend types and functions. 4641 // Most C++ 98 compilers do seem to give an error here, so 4642 // we do, too. 4643 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4644 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4645 } 4646 4647 if (DC->isFileContext()) { 4648 // This implies that it has to be an operator or function. 4649 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4650 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4651 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4652 Diag(Loc, diag::err_introducing_special_friend) << 4653 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4654 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4655 return DeclPtrTy(); 4656 } 4657 } 4658 4659 bool Redeclaration = false; 4660 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4661 move(TemplateParams), 4662 IsDefinition, 4663 Redeclaration); 4664 if (!ND) return DeclPtrTy(); 4665 4666 assert(ND->getDeclContext() == DC); 4667 assert(ND->getLexicalDeclContext() == CurContext); 4668 4669 // Add the function declaration to the appropriate lookup tables, 4670 // adjusting the redeclarations list as necessary. We don't 4671 // want to do this yet if the friending class is dependent. 4672 // 4673 // Also update the scope-based lookup if the target context's 4674 // lookup context is in lexical scope. 4675 if (!CurContext->isDependentContext()) { 4676 DC = DC->getLookupContext(); 4677 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4678 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4679 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4680 } 4681 4682 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4683 D.getIdentifierLoc(), ND, 4684 DS.getFriendSpecLoc()); 4685 FrD->setAccess(AS_public); 4686 CurContext->addDecl(FrD); 4687 4688 return DeclPtrTy::make(ND); 4689} 4690 4691void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4692 AdjustDeclIfTemplate(dcl); 4693 4694 Decl *Dcl = dcl.getAs<Decl>(); 4695 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4696 if (!Fn) { 4697 Diag(DelLoc, diag::err_deleted_non_function); 4698 return; 4699 } 4700 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4701 Diag(DelLoc, diag::err_deleted_decl_not_first); 4702 Diag(Prev->getLocation(), diag::note_previous_declaration); 4703 // If the declaration wasn't the first, we delete the function anyway for 4704 // recovery. 4705 } 4706 Fn->setDeleted(); 4707} 4708 4709static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4710 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4711 ++CI) { 4712 Stmt *SubStmt = *CI; 4713 if (!SubStmt) 4714 continue; 4715 if (isa<ReturnStmt>(SubStmt)) 4716 Self.Diag(SubStmt->getSourceRange().getBegin(), 4717 diag::err_return_in_constructor_handler); 4718 if (!isa<Expr>(SubStmt)) 4719 SearchForReturnInStmt(Self, SubStmt); 4720 } 4721} 4722 4723void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4724 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4725 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4726 SearchForReturnInStmt(*this, Handler); 4727 } 4728} 4729 4730bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4731 const CXXMethodDecl *Old) { 4732 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4733 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4734 4735 QualType CNewTy = Context.getCanonicalType(NewTy); 4736 QualType COldTy = Context.getCanonicalType(OldTy); 4737 4738 if (CNewTy == COldTy && 4739 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 4740 return false; 4741 4742 // Check if the return types are covariant 4743 QualType NewClassTy, OldClassTy; 4744 4745 /// Both types must be pointers or references to classes. 4746 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4747 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4748 NewClassTy = NewPT->getPointeeType(); 4749 OldClassTy = OldPT->getPointeeType(); 4750 } 4751 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4752 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4753 NewClassTy = NewRT->getPointeeType(); 4754 OldClassTy = OldRT->getPointeeType(); 4755 } 4756 } 4757 4758 // The return types aren't either both pointers or references to a class type. 4759 if (NewClassTy.isNull()) { 4760 Diag(New->getLocation(), 4761 diag::err_different_return_type_for_overriding_virtual_function) 4762 << New->getDeclName() << NewTy << OldTy; 4763 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4764 4765 return true; 4766 } 4767 4768 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 4769 // Check if the new class derives from the old class. 4770 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4771 Diag(New->getLocation(), 4772 diag::err_covariant_return_not_derived) 4773 << New->getDeclName() << NewTy << OldTy; 4774 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4775 return true; 4776 } 4777 4778 // Check if we the conversion from derived to base is valid. 4779 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4780 diag::err_covariant_return_inaccessible_base, 4781 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4782 // FIXME: Should this point to the return type? 4783 New->getLocation(), SourceRange(), New->getDeclName())) { 4784 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4785 return true; 4786 } 4787 } 4788 4789 // The qualifiers of the return types must be the same. 4790 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 4791 Diag(New->getLocation(), 4792 diag::err_covariant_return_type_different_qualifications) 4793 << New->getDeclName() << NewTy << OldTy; 4794 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4795 return true; 4796 }; 4797 4798 4799 // The new class type must have the same or less qualifiers as the old type. 4800 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4801 Diag(New->getLocation(), 4802 diag::err_covariant_return_type_class_type_more_qualified) 4803 << New->getDeclName() << NewTy << OldTy; 4804 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4805 return true; 4806 }; 4807 4808 return false; 4809} 4810 4811/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4812/// initializer for the declaration 'Dcl'. 4813/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4814/// static data member of class X, names should be looked up in the scope of 4815/// class X. 4816void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4817 AdjustDeclIfTemplate(Dcl); 4818 4819 Decl *D = Dcl.getAs<Decl>(); 4820 // If there is no declaration, there was an error parsing it. 4821 if (D == 0) 4822 return; 4823 4824 // Check whether it is a declaration with a nested name specifier like 4825 // int foo::bar; 4826 if (!D->isOutOfLine()) 4827 return; 4828 4829 // C++ [basic.lookup.unqual]p13 4830 // 4831 // A name used in the definition of a static data member of class X 4832 // (after the qualified-id of the static member) is looked up as if the name 4833 // was used in a member function of X. 4834 4835 // Change current context into the context of the initializing declaration. 4836 EnterDeclaratorContext(S, D->getDeclContext()); 4837} 4838 4839/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4840/// initializer for the declaration 'Dcl'. 4841void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4842 AdjustDeclIfTemplate(Dcl); 4843 4844 Decl *D = Dcl.getAs<Decl>(); 4845 // If there is no declaration, there was an error parsing it. 4846 if (D == 0) 4847 return; 4848 4849 // Check whether it is a declaration with a nested name specifier like 4850 // int foo::bar; 4851 if (!D->isOutOfLine()) 4852 return; 4853 4854 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4855 ExitDeclaratorContext(S); 4856} 4857