SemaDeclCXX.cpp revision 194179
1130803Smarcel//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2130803Smarcel// 3130803Smarcel// The LLVM Compiler Infrastructure 4130803Smarcel// 5130803Smarcel// This file is distributed under the University of Illinois Open Source 6130803Smarcel// License. See LICENSE.TXT for details. 7130803Smarcel// 8130803Smarcel//===----------------------------------------------------------------------===// 9130803Smarcel// 10130803Smarcel// This file implements semantic analysis for C++ declarations. 11130803Smarcel// 12130803Smarcel//===----------------------------------------------------------------------===// 13130803Smarcel 14130803Smarcel#include "Sema.h" 15130803Smarcel#include "SemaInherit.h" 16130803Smarcel#include "clang/AST/ASTConsumer.h" 17130803Smarcel#include "clang/AST/ASTContext.h" 18130803Smarcel#include "clang/AST/DeclVisitor.h" 19130803Smarcel#include "clang/AST/TypeOrdering.h" 20130803Smarcel#include "clang/AST/StmtVisitor.h" 21130803Smarcel#include "clang/Lex/Preprocessor.h" 22130803Smarcel#include "clang/Parse/DeclSpec.h" 23130803Smarcel#include "llvm/ADT/STLExtras.h" 24130803Smarcel#include "llvm/Support/Compiler.h" 25130803Smarcel#include <algorithm> // for std::equal 26130803Smarcel#include <map> 27130803Smarcel 28130803Smarcelusing namespace clang; 29130803Smarcel 30130803Smarcel//===----------------------------------------------------------------------===// 31130803Smarcel// CheckDefaultArgumentVisitor 32130803Smarcel//===----------------------------------------------------------------------===// 33130803Smarcel 34130803Smarcelnamespace { 35130803Smarcel /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36130803Smarcel /// the default argument of a parameter to determine whether it 37130803Smarcel /// contains any ill-formed subexpressions. For example, this will 38130803Smarcel /// diagnose the use of local variables or parameters within the 39130803Smarcel /// default argument expression. 40130803Smarcel class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41130803Smarcel : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42130803Smarcel Expr *DefaultArg; 43130803Smarcel Sema *S; 44130803Smarcel 45130803Smarcel public: 46130803Smarcel CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47130803Smarcel : DefaultArg(defarg), S(s) {} 48130803Smarcel 49130803Smarcel bool VisitExpr(Expr *Node); 50130803Smarcel bool VisitDeclRefExpr(DeclRefExpr *DRE); 51130803Smarcel bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52130803Smarcel }; 53130803Smarcel 54130803Smarcel /// VisitExpr - Visit all of the children of this expression. 55130803Smarcel bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56130803Smarcel bool IsInvalid = false; 57130803Smarcel for (Stmt::child_iterator I = Node->child_begin(), 58130803Smarcel E = Node->child_end(); I != E; ++I) 59130803Smarcel IsInvalid |= Visit(*I); 60130803Smarcel return IsInvalid; 61130803Smarcel } 62130803Smarcel 63130803Smarcel /// VisitDeclRefExpr - Visit a reference to a declaration, to 64130803Smarcel /// determine whether this declaration can be used in the default 65130803Smarcel /// argument expression. 66130803Smarcel bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67130803Smarcel NamedDecl *Decl = DRE->getDecl(); 68130803Smarcel if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69130803Smarcel // C++ [dcl.fct.default]p9 70130803Smarcel // Default arguments are evaluated each time the function is 71130803Smarcel // called. The order of evaluation of function arguments is 72130803Smarcel // unspecified. Consequently, parameters of a function shall not 73130803Smarcel // be used in default argument expressions, even if they are not 74130803Smarcel // evaluated. Parameters of a function declared before a default 75130803Smarcel // argument expression are in scope and can hide namespace and 76130803Smarcel // class member names. 77130803Smarcel return S->Diag(DRE->getSourceRange().getBegin(), 78130803Smarcel diag::err_param_default_argument_references_param) 79130803Smarcel << Param->getDeclName() << DefaultArg->getSourceRange(); 80130803Smarcel } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81130803Smarcel // C++ [dcl.fct.default]p7 82130803Smarcel // Local variables shall not be used in default argument 83130803Smarcel // expressions. 84130803Smarcel if (VDecl->isBlockVarDecl()) 85130803Smarcel return S->Diag(DRE->getSourceRange().getBegin(), 86130803Smarcel diag::err_param_default_argument_references_local) 87130803Smarcel << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88130803Smarcel } 89130803Smarcel 90130803Smarcel return false; 91130803Smarcel } 92130803Smarcel 93130803Smarcel /// VisitCXXThisExpr - Visit a C++ "this" expression. 94130803Smarcel bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95130803Smarcel // C++ [dcl.fct.default]p8: 96130803Smarcel // The keyword this shall not be used in a default argument of a 97130803Smarcel // member function. 98130803Smarcel return S->Diag(ThisE->getSourceRange().getBegin(), 99130803Smarcel diag::err_param_default_argument_references_this) 100130803Smarcel << ThisE->getSourceRange(); 101130803Smarcel } 102130803Smarcel} 103130803Smarcel 104130803Smarcel/// ActOnParamDefaultArgument - Check whether the default argument 105130803Smarcel/// provided for a function parameter is well-formed. If so, attach it 106130803Smarcel/// to the parameter declaration. 107130803Smarcelvoid 108130803SmarcelSema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109130803Smarcel ExprArg defarg) { 110130803Smarcel ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111130803Smarcel UnparsedDefaultArgLocs.erase(Param); 112130803Smarcel 113130803Smarcel ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 114130803Smarcel QualType ParamType = Param->getType(); 115130803Smarcel 116130803Smarcel // Default arguments are only permitted in C++ 117130803Smarcel if (!getLangOptions().CPlusPlus) { 118130803Smarcel Diag(EqualLoc, diag::err_param_default_argument) 119130803Smarcel << DefaultArg->getSourceRange(); 120130803Smarcel Param->setInvalidDecl(); 121130803Smarcel return; 122130803Smarcel } 123130803Smarcel 124130803Smarcel // C++ [dcl.fct.default]p5 125130803Smarcel // A default argument expression is implicitly converted (clause 126130803Smarcel // 4) to the parameter type. The default argument expression has 127130803Smarcel // the same semantic constraints as the initializer expression in 128130803Smarcel // a declaration of a variable of the parameter type, using the 129130803Smarcel // copy-initialization semantics (8.5). 130130803Smarcel Expr *DefaultArgPtr = DefaultArg.get(); 131130803Smarcel bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 132130803Smarcel EqualLoc, 133130803Smarcel Param->getDeclName(), 134130803Smarcel /*DirectInit=*/false); 135130803Smarcel if (DefaultArgPtr != DefaultArg.get()) { 136130803Smarcel DefaultArg.take(); 137130803Smarcel DefaultArg.reset(DefaultArgPtr); 138130803Smarcel } 139130803Smarcel if (DefaultInitFailed) { 140130803Smarcel return; 141130803Smarcel } 142130803Smarcel 143130803Smarcel // Check that the default argument is well-formed 144130803Smarcel CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 145130803Smarcel if (DefaultArgChecker.Visit(DefaultArg.get())) { 146130803Smarcel Param->setInvalidDecl(); 147130803Smarcel return; 148130803Smarcel } 149130803Smarcel 150130803Smarcel // Okay: add the default argument to the parameter 151130803Smarcel Param->setDefaultArg(DefaultArg.take()); 152130803Smarcel} 153130803Smarcel 154130803Smarcel/// ActOnParamUnparsedDefaultArgument - We've seen a default 155130803Smarcel/// argument for a function parameter, but we can't parse it yet 156130803Smarcel/// because we're inside a class definition. Note that this default 157130803Smarcel/// argument will be parsed later. 158130803Smarcelvoid Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 159130803Smarcel SourceLocation EqualLoc, 160130803Smarcel SourceLocation ArgLoc) { 161130803Smarcel ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 162130803Smarcel if (Param) 163130803Smarcel Param->setUnparsedDefaultArg(); 164130803Smarcel 165130803Smarcel UnparsedDefaultArgLocs[Param] = ArgLoc; 166130803Smarcel} 167130803Smarcel 168130803Smarcel/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 169130803Smarcel/// the default argument for the parameter param failed. 170130803Smarcelvoid Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 171130803Smarcel ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 172130803Smarcel 173130803Smarcel Param->setInvalidDecl(); 174130803Smarcel 175130803Smarcel UnparsedDefaultArgLocs.erase(Param); 176130803Smarcel} 177130803Smarcel 178130803Smarcel/// CheckExtraCXXDefaultArguments - Check for any extra default 179130803Smarcel/// arguments in the declarator, which is not a function declaration 180130803Smarcel/// or definition and therefore is not permitted to have default 181130803Smarcel/// arguments. This routine should be invoked for every declarator 182130803Smarcel/// that is not a function declaration or definition. 183130803Smarcelvoid Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 184130803Smarcel // C++ [dcl.fct.default]p3 185130803Smarcel // A default argument expression shall be specified only in the 186130803Smarcel // parameter-declaration-clause of a function declaration or in a 187130803Smarcel // template-parameter (14.1). It shall not be specified for a 188130803Smarcel // parameter pack. If it is specified in a 189130803Smarcel // parameter-declaration-clause, it shall not occur within a 190130803Smarcel // declarator or abstract-declarator of a parameter-declaration. 191130803Smarcel for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 192130803Smarcel DeclaratorChunk &chunk = D.getTypeObject(i); 193130803Smarcel if (chunk.Kind == DeclaratorChunk::Function) { 194130803Smarcel for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 195130803Smarcel ParmVarDecl *Param = 196130803Smarcel cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 197130803Smarcel if (Param->hasUnparsedDefaultArg()) { 198130803Smarcel CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 199130803Smarcel Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 200130803Smarcel << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 201130803Smarcel delete Toks; 202130803Smarcel chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 203130803Smarcel } else if (Param->getDefaultArg()) { 204130803Smarcel Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 205130803Smarcel << Param->getDefaultArg()->getSourceRange(); 206130803Smarcel Param->setDefaultArg(0); 207130803Smarcel } 208130803Smarcel } 209130803Smarcel } 210130803Smarcel } 211130803Smarcel} 212130803Smarcel 213130803Smarcel// MergeCXXFunctionDecl - Merge two declarations of the same C++ 214130803Smarcel// function, once we already know that they have the same 215130803Smarcel// type. Subroutine of MergeFunctionDecl. Returns true if there was an 216130803Smarcel// error, false otherwise. 217130803Smarcelbool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 218130803Smarcel bool Invalid = false; 219130803Smarcel 220130803Smarcel // C++ [dcl.fct.default]p4: 221130803Smarcel // 222130803Smarcel // For non-template functions, default arguments can be added in 223130803Smarcel // later declarations of a function in the same 224130803Smarcel // scope. Declarations in different scopes have completely 225130803Smarcel // distinct sets of default arguments. That is, declarations in 226130803Smarcel // inner scopes do not acquire default arguments from 227130803Smarcel // declarations in outer scopes, and vice versa. In a given 228130803Smarcel // function declaration, all parameters subsequent to a 229130803Smarcel // parameter with a default argument shall have default 230130803Smarcel // arguments supplied in this or previous declarations. A 231130803Smarcel // default argument shall not be redefined by a later 232130803Smarcel // declaration (not even to the same value). 233130803Smarcel for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 234130803Smarcel ParmVarDecl *OldParam = Old->getParamDecl(p); 235130803Smarcel ParmVarDecl *NewParam = New->getParamDecl(p); 236130803Smarcel 237130803Smarcel if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 238130803Smarcel Diag(NewParam->getLocation(), 239130803Smarcel diag::err_param_default_argument_redefinition) 240130803Smarcel << NewParam->getDefaultArg()->getSourceRange(); 241130803Smarcel Diag(OldParam->getLocation(), diag::note_previous_definition); 242130803Smarcel Invalid = true; 243130803Smarcel } else if (OldParam->getDefaultArg()) { 244130803Smarcel // Merge the old default argument into the new parameter 245130803Smarcel NewParam->setDefaultArg(OldParam->getDefaultArg()); 246130803Smarcel } 247130803Smarcel } 248130803Smarcel 249130803Smarcel return Invalid; 250130803Smarcel} 251130803Smarcel 252130803Smarcel/// CheckCXXDefaultArguments - Verify that the default arguments for a 253130803Smarcel/// function declaration are well-formed according to C++ 254130803Smarcel/// [dcl.fct.default]. 255130803Smarcelvoid Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 256130803Smarcel unsigned NumParams = FD->getNumParams(); 257130803Smarcel unsigned p; 258130803Smarcel 259130803Smarcel // Find first parameter with a default argument 260130803Smarcel for (p = 0; p < NumParams; ++p) { 261130803Smarcel ParmVarDecl *Param = FD->getParamDecl(p); 262130803Smarcel if (Param->getDefaultArg()) 263130803Smarcel break; 264130803Smarcel } 265130803Smarcel 266130803Smarcel // C++ [dcl.fct.default]p4: 267130803Smarcel // In a given function declaration, all parameters 268130803Smarcel // subsequent to a parameter with a default argument shall 269130803Smarcel // have default arguments supplied in this or previous 270130803Smarcel // declarations. A default argument shall not be redefined 271130803Smarcel // by a later declaration (not even to the same value). 272130803Smarcel unsigned LastMissingDefaultArg = 0; 273130803Smarcel for(; p < NumParams; ++p) { 274130803Smarcel ParmVarDecl *Param = FD->getParamDecl(p); 275130803Smarcel if (!Param->getDefaultArg()) { 276130803Smarcel if (Param->isInvalidDecl()) 277130803Smarcel /* We already complained about this parameter. */; 278130803Smarcel else if (Param->getIdentifier()) 279130803Smarcel Diag(Param->getLocation(), 280130803Smarcel diag::err_param_default_argument_missing_name) 281130803Smarcel << Param->getIdentifier(); 282130803Smarcel else 283130803Smarcel Diag(Param->getLocation(), 284130803Smarcel diag::err_param_default_argument_missing); 285130803Smarcel 286130803Smarcel LastMissingDefaultArg = p; 287130803Smarcel } 288130803Smarcel } 289130803Smarcel 290130803Smarcel if (LastMissingDefaultArg > 0) { 291130803Smarcel // Some default arguments were missing. Clear out all of the 292130803Smarcel // default arguments up to (and including) the last missing 293130803Smarcel // default argument, so that we leave the function parameters 294130803Smarcel // in a semantically valid state. 295130803Smarcel for (p = 0; p <= LastMissingDefaultArg; ++p) { 296130803Smarcel ParmVarDecl *Param = FD->getParamDecl(p); 297130803Smarcel if (Param->hasDefaultArg()) { 298130803Smarcel if (!Param->hasUnparsedDefaultArg()) 299130803Smarcel Param->getDefaultArg()->Destroy(Context); 300130803Smarcel Param->setDefaultArg(0); 301130803Smarcel } 302130803Smarcel } 303130803Smarcel } 304130803Smarcel} 305130803Smarcel 306130803Smarcel/// isCurrentClassName - Determine whether the identifier II is the 307130803Smarcel/// name of the class type currently being defined. In the case of 308130803Smarcel/// nested classes, this will only return true if II is the name of 309130803Smarcel/// the innermost class. 310130803Smarcelbool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 311130803Smarcel const CXXScopeSpec *SS) { 312130803Smarcel CXXRecordDecl *CurDecl; 313130803Smarcel if (SS && SS->isSet() && !SS->isInvalid()) { 314130803Smarcel DeclContext *DC = computeDeclContext(*SS); 315130803Smarcel CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 316130803Smarcel } else 317130803Smarcel CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 318130803Smarcel 319130803Smarcel if (CurDecl) 320130803Smarcel return &II == CurDecl->getIdentifier(); 321130803Smarcel else 322130803Smarcel return false; 323130803Smarcel} 324130803Smarcel 325130803Smarcel/// \brief Check the validity of a C++ base class specifier. 326130803Smarcel/// 327130803Smarcel/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 328130803Smarcel/// and returns NULL otherwise. 329130803SmarcelCXXBaseSpecifier * 330130803SmarcelSema::CheckBaseSpecifier(CXXRecordDecl *Class, 331130803Smarcel SourceRange SpecifierRange, 332130803Smarcel bool Virtual, AccessSpecifier Access, 333130803Smarcel QualType BaseType, 334130803Smarcel SourceLocation BaseLoc) { 335130803Smarcel // C++ [class.union]p1: 336130803Smarcel // A union shall not have base classes. 337130803Smarcel if (Class->isUnion()) { 338130803Smarcel Diag(Class->getLocation(), diag::err_base_clause_on_union) 339130803Smarcel << SpecifierRange; 340130803Smarcel return 0; 341130803Smarcel } 342130803Smarcel 343130803Smarcel if (BaseType->isDependentType()) 344130803Smarcel return new CXXBaseSpecifier(SpecifierRange, Virtual, 345130803Smarcel Class->getTagKind() == RecordDecl::TK_class, 346130803Smarcel Access, BaseType); 347130803Smarcel 348130803Smarcel // Base specifiers must be record types. 349130803Smarcel if (!BaseType->isRecordType()) { 350130803Smarcel Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 351130803Smarcel return 0; 352 } 353 354 // C++ [class.union]p1: 355 // A union shall not be used as a base class. 356 if (BaseType->isUnionType()) { 357 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 358 return 0; 359 } 360 361 // C++ [class.derived]p2: 362 // The class-name in a base-specifier shall not be an incompletely 363 // defined class. 364 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 365 SpecifierRange)) 366 return 0; 367 368 // If the base class is polymorphic, the new one is, too. 369 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 370 assert(BaseDecl && "Record type has no declaration"); 371 BaseDecl = BaseDecl->getDefinition(Context); 372 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 373 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 374 Class->setPolymorphic(true); 375 376 // C++ [dcl.init.aggr]p1: 377 // An aggregate is [...] a class with [...] no base classes [...]. 378 Class->setAggregate(false); 379 Class->setPOD(false); 380 381 if (Virtual) { 382 // C++ [class.ctor]p5: 383 // A constructor is trivial if its class has no virtual base classes. 384 Class->setHasTrivialConstructor(false); 385 } else { 386 // C++ [class.ctor]p5: 387 // A constructor is trivial if all the direct base classes of its 388 // class have trivial constructors. 389 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 390 hasTrivialConstructor()); 391 } 392 393 // C++ [class.ctor]p3: 394 // A destructor is trivial if all the direct base classes of its class 395 // have trivial destructors. 396 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 397 hasTrivialDestructor()); 398 399 // Create the base specifier. 400 // FIXME: Allocate via ASTContext? 401 return new CXXBaseSpecifier(SpecifierRange, Virtual, 402 Class->getTagKind() == RecordDecl::TK_class, 403 Access, BaseType); 404} 405 406/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 407/// one entry in the base class list of a class specifier, for 408/// example: 409/// class foo : public bar, virtual private baz { 410/// 'public bar' and 'virtual private baz' are each base-specifiers. 411Sema::BaseResult 412Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 413 bool Virtual, AccessSpecifier Access, 414 TypeTy *basetype, SourceLocation BaseLoc) { 415 AdjustDeclIfTemplate(classdecl); 416 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 417 QualType BaseType = QualType::getFromOpaquePtr(basetype); 418 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 419 Virtual, Access, 420 BaseType, BaseLoc)) 421 return BaseSpec; 422 423 return true; 424} 425 426/// \brief Performs the actual work of attaching the given base class 427/// specifiers to a C++ class. 428bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 429 unsigned NumBases) { 430 if (NumBases == 0) 431 return false; 432 433 // Used to keep track of which base types we have already seen, so 434 // that we can properly diagnose redundant direct base types. Note 435 // that the key is always the unqualified canonical type of the base 436 // class. 437 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 438 439 // Copy non-redundant base specifiers into permanent storage. 440 unsigned NumGoodBases = 0; 441 bool Invalid = false; 442 for (unsigned idx = 0; idx < NumBases; ++idx) { 443 QualType NewBaseType 444 = Context.getCanonicalType(Bases[idx]->getType()); 445 NewBaseType = NewBaseType.getUnqualifiedType(); 446 447 if (KnownBaseTypes[NewBaseType]) { 448 // C++ [class.mi]p3: 449 // A class shall not be specified as a direct base class of a 450 // derived class more than once. 451 Diag(Bases[idx]->getSourceRange().getBegin(), 452 diag::err_duplicate_base_class) 453 << KnownBaseTypes[NewBaseType]->getType() 454 << Bases[idx]->getSourceRange(); 455 456 // Delete the duplicate base class specifier; we're going to 457 // overwrite its pointer later. 458 delete Bases[idx]; 459 460 Invalid = true; 461 } else { 462 // Okay, add this new base class. 463 KnownBaseTypes[NewBaseType] = Bases[idx]; 464 Bases[NumGoodBases++] = Bases[idx]; 465 } 466 } 467 468 // Attach the remaining base class specifiers to the derived class. 469 Class->setBases(Bases, NumGoodBases); 470 471 // Delete the remaining (good) base class specifiers, since their 472 // data has been copied into the CXXRecordDecl. 473 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 474 delete Bases[idx]; 475 476 return Invalid; 477} 478 479/// ActOnBaseSpecifiers - Attach the given base specifiers to the 480/// class, after checking whether there are any duplicate base 481/// classes. 482void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 483 unsigned NumBases) { 484 if (!ClassDecl || !Bases || !NumBases) 485 return; 486 487 AdjustDeclIfTemplate(ClassDecl); 488 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 489 (CXXBaseSpecifier**)(Bases), NumBases); 490} 491 492//===----------------------------------------------------------------------===// 493// C++ class member Handling 494//===----------------------------------------------------------------------===// 495 496/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 497/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 498/// bitfield width if there is one and 'InitExpr' specifies the initializer if 499/// any. 500Sema::DeclPtrTy 501Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 502 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 503 const DeclSpec &DS = D.getDeclSpec(); 504 DeclarationName Name = GetNameForDeclarator(D); 505 Expr *BitWidth = static_cast<Expr*>(BW); 506 Expr *Init = static_cast<Expr*>(InitExpr); 507 SourceLocation Loc = D.getIdentifierLoc(); 508 509 bool isFunc = D.isFunctionDeclarator(); 510 511 // C++ 9.2p6: A member shall not be declared to have automatic storage 512 // duration (auto, register) or with the extern storage-class-specifier. 513 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 514 // data members and cannot be applied to names declared const or static, 515 // and cannot be applied to reference members. 516 switch (DS.getStorageClassSpec()) { 517 case DeclSpec::SCS_unspecified: 518 case DeclSpec::SCS_typedef: 519 case DeclSpec::SCS_static: 520 // FALL THROUGH. 521 break; 522 case DeclSpec::SCS_mutable: 523 if (isFunc) { 524 if (DS.getStorageClassSpecLoc().isValid()) 525 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 526 else 527 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 528 529 // FIXME: It would be nicer if the keyword was ignored only for this 530 // declarator. Otherwise we could get follow-up errors. 531 D.getMutableDeclSpec().ClearStorageClassSpecs(); 532 } else { 533 QualType T = GetTypeForDeclarator(D, S); 534 diag::kind err = static_cast<diag::kind>(0); 535 if (T->isReferenceType()) 536 err = diag::err_mutable_reference; 537 else if (T.isConstQualified()) 538 err = diag::err_mutable_const; 539 if (err != 0) { 540 if (DS.getStorageClassSpecLoc().isValid()) 541 Diag(DS.getStorageClassSpecLoc(), err); 542 else 543 Diag(DS.getThreadSpecLoc(), err); 544 // FIXME: It would be nicer if the keyword was ignored only for this 545 // declarator. Otherwise we could get follow-up errors. 546 D.getMutableDeclSpec().ClearStorageClassSpecs(); 547 } 548 } 549 break; 550 default: 551 if (DS.getStorageClassSpecLoc().isValid()) 552 Diag(DS.getStorageClassSpecLoc(), 553 diag::err_storageclass_invalid_for_member); 554 else 555 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 556 D.getMutableDeclSpec().ClearStorageClassSpecs(); 557 } 558 559 if (!isFunc && 560 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 561 D.getNumTypeObjects() == 0) { 562 // Check also for this case: 563 // 564 // typedef int f(); 565 // f a; 566 // 567 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 568 isFunc = TDType->isFunctionType(); 569 } 570 571 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 572 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 573 !isFunc); 574 575 Decl *Member; 576 if (isInstField) { 577 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 578 AS); 579 assert(Member && "HandleField never returns null"); 580 } else { 581 Member = ActOnDeclarator(S, D).getAs<Decl>(); 582 if (!Member) { 583 if (BitWidth) DeleteExpr(BitWidth); 584 return DeclPtrTy(); 585 } 586 587 // Non-instance-fields can't have a bitfield. 588 if (BitWidth) { 589 if (Member->isInvalidDecl()) { 590 // don't emit another diagnostic. 591 } else if (isa<VarDecl>(Member)) { 592 // C++ 9.6p3: A bit-field shall not be a static member. 593 // "static member 'A' cannot be a bit-field" 594 Diag(Loc, diag::err_static_not_bitfield) 595 << Name << BitWidth->getSourceRange(); 596 } else if (isa<TypedefDecl>(Member)) { 597 // "typedef member 'x' cannot be a bit-field" 598 Diag(Loc, diag::err_typedef_not_bitfield) 599 << Name << BitWidth->getSourceRange(); 600 } else { 601 // A function typedef ("typedef int f(); f a;"). 602 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 603 Diag(Loc, diag::err_not_integral_type_bitfield) 604 << Name << cast<ValueDecl>(Member)->getType() 605 << BitWidth->getSourceRange(); 606 } 607 608 DeleteExpr(BitWidth); 609 BitWidth = 0; 610 Member->setInvalidDecl(); 611 } 612 613 Member->setAccess(AS); 614 } 615 616 assert((Name || isInstField) && "No identifier for non-field ?"); 617 618 if (Init) 619 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 620 if (Deleted) // FIXME: Source location is not very good. 621 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 622 623 if (isInstField) { 624 FieldCollector->Add(cast<FieldDecl>(Member)); 625 return DeclPtrTy(); 626 } 627 return DeclPtrTy::make(Member); 628} 629 630/// ActOnMemInitializer - Handle a C++ member initializer. 631Sema::MemInitResult 632Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 633 Scope *S, 634 IdentifierInfo *MemberOrBase, 635 SourceLocation IdLoc, 636 SourceLocation LParenLoc, 637 ExprTy **Args, unsigned NumArgs, 638 SourceLocation *CommaLocs, 639 SourceLocation RParenLoc) { 640 CXXConstructorDecl *Constructor 641 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 642 if (!Constructor) { 643 // The user wrote a constructor initializer on a function that is 644 // not a C++ constructor. Ignore the error for now, because we may 645 // have more member initializers coming; we'll diagnose it just 646 // once in ActOnMemInitializers. 647 return true; 648 } 649 650 CXXRecordDecl *ClassDecl = Constructor->getParent(); 651 652 // C++ [class.base.init]p2: 653 // Names in a mem-initializer-id are looked up in the scope of the 654 // constructor���s class and, if not found in that scope, are looked 655 // up in the scope containing the constructor���s 656 // definition. [Note: if the constructor���s class contains a member 657 // with the same name as a direct or virtual base class of the 658 // class, a mem-initializer-id naming the member or base class and 659 // composed of a single identifier refers to the class member. A 660 // mem-initializer-id for the hidden base class may be specified 661 // using a qualified name. ] 662 // Look for a member, first. 663 FieldDecl *Member = 0; 664 DeclContext::lookup_result Result 665 = ClassDecl->lookup(Context, MemberOrBase); 666 if (Result.first != Result.second) 667 Member = dyn_cast<FieldDecl>(*Result.first); 668 669 // FIXME: Handle members of an anonymous union. 670 671 if (Member) { 672 // FIXME: Perform direct initialization of the member. 673 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 674 } 675 676 // It didn't name a member, so see if it names a class. 677 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 678 if (!BaseTy) 679 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 680 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 681 682 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 683 if (!BaseType->isRecordType()) 684 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 685 << BaseType << SourceRange(IdLoc, RParenLoc); 686 687 // C++ [class.base.init]p2: 688 // [...] Unless the mem-initializer-id names a nonstatic data 689 // member of the constructor���s class or a direct or virtual base 690 // of that class, the mem-initializer is ill-formed. A 691 // mem-initializer-list can initialize a base class using any 692 // name that denotes that base class type. 693 694 // First, check for a direct base class. 695 const CXXBaseSpecifier *DirectBaseSpec = 0; 696 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 697 Base != ClassDecl->bases_end(); ++Base) { 698 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 699 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 700 // We found a direct base of this type. That's what we're 701 // initializing. 702 DirectBaseSpec = &*Base; 703 break; 704 } 705 } 706 707 // Check for a virtual base class. 708 // FIXME: We might be able to short-circuit this if we know in advance that 709 // there are no virtual bases. 710 const CXXBaseSpecifier *VirtualBaseSpec = 0; 711 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 712 // We haven't found a base yet; search the class hierarchy for a 713 // virtual base class. 714 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 715 /*DetectVirtual=*/false); 716 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 717 for (BasePaths::paths_iterator Path = Paths.begin(); 718 Path != Paths.end(); ++Path) { 719 if (Path->back().Base->isVirtual()) { 720 VirtualBaseSpec = Path->back().Base; 721 break; 722 } 723 } 724 } 725 } 726 727 // C++ [base.class.init]p2: 728 // If a mem-initializer-id is ambiguous because it designates both 729 // a direct non-virtual base class and an inherited virtual base 730 // class, the mem-initializer is ill-formed. 731 if (DirectBaseSpec && VirtualBaseSpec) 732 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 733 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 734 735 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 736} 737 738void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 739 SourceLocation ColonLoc, 740 MemInitTy **MemInits, unsigned NumMemInits) { 741 CXXConstructorDecl *Constructor = 742 dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 743 744 if (!Constructor) { 745 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 746 return; 747 } 748} 749 750namespace { 751 /// PureVirtualMethodCollector - traverses a class and its superclasses 752 /// and determines if it has any pure virtual methods. 753 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 754 ASTContext &Context; 755 756 public: 757 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 758 759 private: 760 MethodList Methods; 761 762 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 763 764 public: 765 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 766 : Context(Ctx) { 767 768 MethodList List; 769 Collect(RD, List); 770 771 // Copy the temporary list to methods, and make sure to ignore any 772 // null entries. 773 for (size_t i = 0, e = List.size(); i != e; ++i) { 774 if (List[i]) 775 Methods.push_back(List[i]); 776 } 777 } 778 779 bool empty() const { return Methods.empty(); } 780 781 MethodList::const_iterator methods_begin() { return Methods.begin(); } 782 MethodList::const_iterator methods_end() { return Methods.end(); } 783 }; 784 785 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 786 MethodList& Methods) { 787 // First, collect the pure virtual methods for the base classes. 788 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 789 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 790 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 791 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 792 if (BaseDecl && BaseDecl->isAbstract()) 793 Collect(BaseDecl, Methods); 794 } 795 } 796 797 // Next, zero out any pure virtual methods that this class overrides. 798 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 799 800 MethodSetTy OverriddenMethods; 801 size_t MethodsSize = Methods.size(); 802 803 for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 804 e = RD->decls_end(Context); 805 i != e; ++i) { 806 // Traverse the record, looking for methods. 807 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 808 // If the method is pre virtual, add it to the methods vector. 809 if (MD->isPure()) { 810 Methods.push_back(MD); 811 continue; 812 } 813 814 // Otherwise, record all the overridden methods in our set. 815 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 816 E = MD->end_overridden_methods(); I != E; ++I) { 817 // Keep track of the overridden methods. 818 OverriddenMethods.insert(*I); 819 } 820 } 821 } 822 823 // Now go through the methods and zero out all the ones we know are 824 // overridden. 825 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 826 if (OverriddenMethods.count(Methods[i])) 827 Methods[i] = 0; 828 } 829 830 } 831} 832 833bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 834 unsigned DiagID, AbstractDiagSelID SelID, 835 const CXXRecordDecl *CurrentRD) { 836 837 if (!getLangOptions().CPlusPlus) 838 return false; 839 840 if (const ArrayType *AT = Context.getAsArrayType(T)) 841 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 842 CurrentRD); 843 844 if (const PointerType *PT = T->getAsPointerType()) { 845 // Find the innermost pointer type. 846 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 847 PT = T; 848 849 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 850 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 851 CurrentRD); 852 } 853 854 const RecordType *RT = T->getAsRecordType(); 855 if (!RT) 856 return false; 857 858 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 859 if (!RD) 860 return false; 861 862 if (CurrentRD && CurrentRD != RD) 863 return false; 864 865 if (!RD->isAbstract()) 866 return false; 867 868 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 869 870 // Check if we've already emitted the list of pure virtual functions for this 871 // class. 872 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 873 return true; 874 875 PureVirtualMethodCollector Collector(Context, RD); 876 877 for (PureVirtualMethodCollector::MethodList::const_iterator I = 878 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 879 const CXXMethodDecl *MD = *I; 880 881 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 882 MD->getDeclName(); 883 } 884 885 if (!PureVirtualClassDiagSet) 886 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 887 PureVirtualClassDiagSet->insert(RD); 888 889 return true; 890} 891 892namespace { 893 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 894 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 895 Sema &SemaRef; 896 CXXRecordDecl *AbstractClass; 897 898 bool VisitDeclContext(const DeclContext *DC) { 899 bool Invalid = false; 900 901 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 902 E = DC->decls_end(SemaRef.Context); I != E; ++I) 903 Invalid |= Visit(*I); 904 905 return Invalid; 906 } 907 908 public: 909 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 910 : SemaRef(SemaRef), AbstractClass(ac) { 911 Visit(SemaRef.Context.getTranslationUnitDecl()); 912 } 913 914 bool VisitFunctionDecl(const FunctionDecl *FD) { 915 if (FD->isThisDeclarationADefinition()) { 916 // No need to do the check if we're in a definition, because it requires 917 // that the return/param types are complete. 918 // because that requires 919 return VisitDeclContext(FD); 920 } 921 922 // Check the return type. 923 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 924 bool Invalid = 925 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 926 diag::err_abstract_type_in_decl, 927 Sema::AbstractReturnType, 928 AbstractClass); 929 930 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 931 E = FD->param_end(); I != E; ++I) { 932 const ParmVarDecl *VD = *I; 933 Invalid |= 934 SemaRef.RequireNonAbstractType(VD->getLocation(), 935 VD->getOriginalType(), 936 diag::err_abstract_type_in_decl, 937 Sema::AbstractParamType, 938 AbstractClass); 939 } 940 941 return Invalid; 942 } 943 944 bool VisitDecl(const Decl* D) { 945 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 946 return VisitDeclContext(DC); 947 948 return false; 949 } 950 }; 951} 952 953void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 954 DeclPtrTy TagDecl, 955 SourceLocation LBrac, 956 SourceLocation RBrac) { 957 AdjustDeclIfTemplate(TagDecl); 958 ActOnFields(S, RLoc, TagDecl, 959 (DeclPtrTy*)FieldCollector->getCurFields(), 960 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 961 962 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 963 if (!RD->isAbstract()) { 964 // Collect all the pure virtual methods and see if this is an abstract 965 // class after all. 966 PureVirtualMethodCollector Collector(Context, RD); 967 if (!Collector.empty()) 968 RD->setAbstract(true); 969 } 970 971 if (RD->isAbstract()) 972 AbstractClassUsageDiagnoser(*this, RD); 973 974 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 975 for (RecordDecl::field_iterator i = RD->field_begin(Context), 976 e = RD->field_end(Context); i != e; ++i) { 977 // All the nonstatic data members must have trivial constructors. 978 QualType FTy = i->getType(); 979 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 980 FTy = AT->getElementType(); 981 982 if (const RecordType *RT = FTy->getAsRecordType()) { 983 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 984 985 if (!FieldRD->hasTrivialConstructor()) 986 RD->setHasTrivialConstructor(false); 987 if (!FieldRD->hasTrivialDestructor()) 988 RD->setHasTrivialDestructor(false); 989 990 // If RD has neither a trivial constructor nor a trivial destructor 991 // we don't need to continue checking. 992 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 993 break; 994 } 995 } 996 } 997 998 if (!RD->isDependentType()) 999 AddImplicitlyDeclaredMembersToClass(RD); 1000} 1001 1002/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1003/// special functions, such as the default constructor, copy 1004/// constructor, or destructor, to the given C++ class (C++ 1005/// [special]p1). This routine can only be executed just before the 1006/// definition of the class is complete. 1007void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1008 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1009 ClassType = Context.getCanonicalType(ClassType); 1010 1011 // FIXME: Implicit declarations have exception specifications, which are 1012 // the union of the specifications of the implicitly called functions. 1013 1014 if (!ClassDecl->hasUserDeclaredConstructor()) { 1015 // C++ [class.ctor]p5: 1016 // A default constructor for a class X is a constructor of class X 1017 // that can be called without an argument. If there is no 1018 // user-declared constructor for class X, a default constructor is 1019 // implicitly declared. An implicitly-declared default constructor 1020 // is an inline public member of its class. 1021 DeclarationName Name 1022 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1023 CXXConstructorDecl *DefaultCon = 1024 CXXConstructorDecl::Create(Context, ClassDecl, 1025 ClassDecl->getLocation(), Name, 1026 Context.getFunctionType(Context.VoidTy, 1027 0, 0, false, 0), 1028 /*isExplicit=*/false, 1029 /*isInline=*/true, 1030 /*isImplicitlyDeclared=*/true); 1031 DefaultCon->setAccess(AS_public); 1032 DefaultCon->setImplicit(); 1033 ClassDecl->addDecl(Context, DefaultCon); 1034 1035 // Notify the class that we've added a constructor. 1036 ClassDecl->addedConstructor(Context, DefaultCon); 1037 } 1038 1039 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1040 // C++ [class.copy]p4: 1041 // If the class definition does not explicitly declare a copy 1042 // constructor, one is declared implicitly. 1043 1044 // C++ [class.copy]p5: 1045 // The implicitly-declared copy constructor for a class X will 1046 // have the form 1047 // 1048 // X::X(const X&) 1049 // 1050 // if 1051 bool HasConstCopyConstructor = true; 1052 1053 // -- each direct or virtual base class B of X has a copy 1054 // constructor whose first parameter is of type const B& or 1055 // const volatile B&, and 1056 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1057 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1058 const CXXRecordDecl *BaseClassDecl 1059 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1060 HasConstCopyConstructor 1061 = BaseClassDecl->hasConstCopyConstructor(Context); 1062 } 1063 1064 // -- for all the nonstatic data members of X that are of a 1065 // class type M (or array thereof), each such class type 1066 // has a copy constructor whose first parameter is of type 1067 // const M& or const volatile M&. 1068 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1069 HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1070 ++Field) { 1071 QualType FieldType = (*Field)->getType(); 1072 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1073 FieldType = Array->getElementType(); 1074 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1075 const CXXRecordDecl *FieldClassDecl 1076 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1077 HasConstCopyConstructor 1078 = FieldClassDecl->hasConstCopyConstructor(Context); 1079 } 1080 } 1081 1082 // Otherwise, the implicitly declared copy constructor will have 1083 // the form 1084 // 1085 // X::X(X&) 1086 QualType ArgType = ClassType; 1087 if (HasConstCopyConstructor) 1088 ArgType = ArgType.withConst(); 1089 ArgType = Context.getLValueReferenceType(ArgType); 1090 1091 // An implicitly-declared copy constructor is an inline public 1092 // member of its class. 1093 DeclarationName Name 1094 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1095 CXXConstructorDecl *CopyConstructor 1096 = CXXConstructorDecl::Create(Context, ClassDecl, 1097 ClassDecl->getLocation(), Name, 1098 Context.getFunctionType(Context.VoidTy, 1099 &ArgType, 1, 1100 false, 0), 1101 /*isExplicit=*/false, 1102 /*isInline=*/true, 1103 /*isImplicitlyDeclared=*/true); 1104 CopyConstructor->setAccess(AS_public); 1105 CopyConstructor->setImplicit(); 1106 1107 // Add the parameter to the constructor. 1108 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1109 ClassDecl->getLocation(), 1110 /*IdentifierInfo=*/0, 1111 ArgType, VarDecl::None, 0); 1112 CopyConstructor->setParams(Context, &FromParam, 1); 1113 1114 ClassDecl->addedConstructor(Context, CopyConstructor); 1115 ClassDecl->addDecl(Context, CopyConstructor); 1116 } 1117 1118 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1119 // Note: The following rules are largely analoguous to the copy 1120 // constructor rules. Note that virtual bases are not taken into account 1121 // for determining the argument type of the operator. Note also that 1122 // operators taking an object instead of a reference are allowed. 1123 // 1124 // C++ [class.copy]p10: 1125 // If the class definition does not explicitly declare a copy 1126 // assignment operator, one is declared implicitly. 1127 // The implicitly-defined copy assignment operator for a class X 1128 // will have the form 1129 // 1130 // X& X::operator=(const X&) 1131 // 1132 // if 1133 bool HasConstCopyAssignment = true; 1134 1135 // -- each direct base class B of X has a copy assignment operator 1136 // whose parameter is of type const B&, const volatile B& or B, 1137 // and 1138 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1139 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1140 const CXXRecordDecl *BaseClassDecl 1141 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1142 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1143 } 1144 1145 // -- for all the nonstatic data members of X that are of a class 1146 // type M (or array thereof), each such class type has a copy 1147 // assignment operator whose parameter is of type const M&, 1148 // const volatile M& or M. 1149 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1150 HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1151 ++Field) { 1152 QualType FieldType = (*Field)->getType(); 1153 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1154 FieldType = Array->getElementType(); 1155 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1156 const CXXRecordDecl *FieldClassDecl 1157 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1158 HasConstCopyAssignment 1159 = FieldClassDecl->hasConstCopyAssignment(Context); 1160 } 1161 } 1162 1163 // Otherwise, the implicitly declared copy assignment operator will 1164 // have the form 1165 // 1166 // X& X::operator=(X&) 1167 QualType ArgType = ClassType; 1168 QualType RetType = Context.getLValueReferenceType(ArgType); 1169 if (HasConstCopyAssignment) 1170 ArgType = ArgType.withConst(); 1171 ArgType = Context.getLValueReferenceType(ArgType); 1172 1173 // An implicitly-declared copy assignment operator is an inline public 1174 // member of its class. 1175 DeclarationName Name = 1176 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1177 CXXMethodDecl *CopyAssignment = 1178 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1179 Context.getFunctionType(RetType, &ArgType, 1, 1180 false, 0), 1181 /*isStatic=*/false, /*isInline=*/true); 1182 CopyAssignment->setAccess(AS_public); 1183 CopyAssignment->setImplicit(); 1184 1185 // Add the parameter to the operator. 1186 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1187 ClassDecl->getLocation(), 1188 /*IdentifierInfo=*/0, 1189 ArgType, VarDecl::None, 0); 1190 CopyAssignment->setParams(Context, &FromParam, 1); 1191 1192 // Don't call addedAssignmentOperator. There is no way to distinguish an 1193 // implicit from an explicit assignment operator. 1194 ClassDecl->addDecl(Context, CopyAssignment); 1195 } 1196 1197 if (!ClassDecl->hasUserDeclaredDestructor()) { 1198 // C++ [class.dtor]p2: 1199 // If a class has no user-declared destructor, a destructor is 1200 // declared implicitly. An implicitly-declared destructor is an 1201 // inline public member of its class. 1202 DeclarationName Name 1203 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1204 CXXDestructorDecl *Destructor 1205 = CXXDestructorDecl::Create(Context, ClassDecl, 1206 ClassDecl->getLocation(), Name, 1207 Context.getFunctionType(Context.VoidTy, 1208 0, 0, false, 0), 1209 /*isInline=*/true, 1210 /*isImplicitlyDeclared=*/true); 1211 Destructor->setAccess(AS_public); 1212 Destructor->setImplicit(); 1213 ClassDecl->addDecl(Context, Destructor); 1214 } 1215} 1216 1217void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1218 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1219 if (!Template) 1220 return; 1221 1222 TemplateParameterList *Params = Template->getTemplateParameters(); 1223 for (TemplateParameterList::iterator Param = Params->begin(), 1224 ParamEnd = Params->end(); 1225 Param != ParamEnd; ++Param) { 1226 NamedDecl *Named = cast<NamedDecl>(*Param); 1227 if (Named->getDeclName()) { 1228 S->AddDecl(DeclPtrTy::make(Named)); 1229 IdResolver.AddDecl(Named); 1230 } 1231 } 1232} 1233 1234/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1235/// parsing a top-level (non-nested) C++ class, and we are now 1236/// parsing those parts of the given Method declaration that could 1237/// not be parsed earlier (C++ [class.mem]p2), such as default 1238/// arguments. This action should enter the scope of the given 1239/// Method declaration as if we had just parsed the qualified method 1240/// name. However, it should not bring the parameters into scope; 1241/// that will be performed by ActOnDelayedCXXMethodParameter. 1242void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1243 CXXScopeSpec SS; 1244 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1245 QualType ClassTy 1246 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1247 SS.setScopeRep( 1248 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1249 ActOnCXXEnterDeclaratorScope(S, SS); 1250} 1251 1252/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1253/// C++ method declaration. We're (re-)introducing the given 1254/// function parameter into scope for use in parsing later parts of 1255/// the method declaration. For example, we could see an 1256/// ActOnParamDefaultArgument event for this parameter. 1257void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1258 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1259 1260 // If this parameter has an unparsed default argument, clear it out 1261 // to make way for the parsed default argument. 1262 if (Param->hasUnparsedDefaultArg()) 1263 Param->setDefaultArg(0); 1264 1265 S->AddDecl(DeclPtrTy::make(Param)); 1266 if (Param->getDeclName()) 1267 IdResolver.AddDecl(Param); 1268} 1269 1270/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1271/// processing the delayed method declaration for Method. The method 1272/// declaration is now considered finished. There may be a separate 1273/// ActOnStartOfFunctionDef action later (not necessarily 1274/// immediately!) for this method, if it was also defined inside the 1275/// class body. 1276void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1277 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1278 CXXScopeSpec SS; 1279 QualType ClassTy 1280 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1281 SS.setScopeRep( 1282 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1283 ActOnCXXExitDeclaratorScope(S, SS); 1284 1285 // Now that we have our default arguments, check the constructor 1286 // again. It could produce additional diagnostics or affect whether 1287 // the class has implicitly-declared destructors, among other 1288 // things. 1289 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1290 CheckConstructor(Constructor); 1291 1292 // Check the default arguments, which we may have added. 1293 if (!Method->isInvalidDecl()) 1294 CheckCXXDefaultArguments(Method); 1295} 1296 1297/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1298/// the well-formedness of the constructor declarator @p D with type @p 1299/// R. If there are any errors in the declarator, this routine will 1300/// emit diagnostics and set the invalid bit to true. In any case, the type 1301/// will be updated to reflect a well-formed type for the constructor and 1302/// returned. 1303QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1304 FunctionDecl::StorageClass &SC) { 1305 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1306 1307 // C++ [class.ctor]p3: 1308 // A constructor shall not be virtual (10.3) or static (9.4). A 1309 // constructor can be invoked for a const, volatile or const 1310 // volatile object. A constructor shall not be declared const, 1311 // volatile, or const volatile (9.3.2). 1312 if (isVirtual) { 1313 if (!D.isInvalidType()) 1314 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1315 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1316 << SourceRange(D.getIdentifierLoc()); 1317 D.setInvalidType(); 1318 } 1319 if (SC == FunctionDecl::Static) { 1320 if (!D.isInvalidType()) 1321 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1322 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1323 << SourceRange(D.getIdentifierLoc()); 1324 D.setInvalidType(); 1325 SC = FunctionDecl::None; 1326 } 1327 1328 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1329 if (FTI.TypeQuals != 0) { 1330 if (FTI.TypeQuals & QualType::Const) 1331 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1332 << "const" << SourceRange(D.getIdentifierLoc()); 1333 if (FTI.TypeQuals & QualType::Volatile) 1334 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1335 << "volatile" << SourceRange(D.getIdentifierLoc()); 1336 if (FTI.TypeQuals & QualType::Restrict) 1337 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1338 << "restrict" << SourceRange(D.getIdentifierLoc()); 1339 } 1340 1341 // Rebuild the function type "R" without any type qualifiers (in 1342 // case any of the errors above fired) and with "void" as the 1343 // return type, since constructors don't have return types. We 1344 // *always* have to do this, because GetTypeForDeclarator will 1345 // put in a result type of "int" when none was specified. 1346 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1347 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1348 Proto->getNumArgs(), 1349 Proto->isVariadic(), 0); 1350} 1351 1352/// CheckConstructor - Checks a fully-formed constructor for 1353/// well-formedness, issuing any diagnostics required. Returns true if 1354/// the constructor declarator is invalid. 1355void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1356 CXXRecordDecl *ClassDecl 1357 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1358 if (!ClassDecl) 1359 return Constructor->setInvalidDecl(); 1360 1361 // C++ [class.copy]p3: 1362 // A declaration of a constructor for a class X is ill-formed if 1363 // its first parameter is of type (optionally cv-qualified) X and 1364 // either there are no other parameters or else all other 1365 // parameters have default arguments. 1366 if (!Constructor->isInvalidDecl() && 1367 ((Constructor->getNumParams() == 1) || 1368 (Constructor->getNumParams() > 1 && 1369 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1370 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1371 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1372 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1373 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1374 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1375 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1376 Constructor->setInvalidDecl(); 1377 } 1378 } 1379 1380 // Notify the class that we've added a constructor. 1381 ClassDecl->addedConstructor(Context, Constructor); 1382} 1383 1384static inline bool 1385FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1386 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1387 FTI.ArgInfo[0].Param && 1388 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1389} 1390 1391/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1392/// the well-formednes of the destructor declarator @p D with type @p 1393/// R. If there are any errors in the declarator, this routine will 1394/// emit diagnostics and set the declarator to invalid. Even if this happens, 1395/// will be updated to reflect a well-formed type for the destructor and 1396/// returned. 1397QualType Sema::CheckDestructorDeclarator(Declarator &D, 1398 FunctionDecl::StorageClass& SC) { 1399 // C++ [class.dtor]p1: 1400 // [...] A typedef-name that names a class is a class-name 1401 // (7.1.3); however, a typedef-name that names a class shall not 1402 // be used as the identifier in the declarator for a destructor 1403 // declaration. 1404 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1405 if (isa<TypedefType>(DeclaratorType)) { 1406 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1407 << DeclaratorType; 1408 D.setInvalidType(); 1409 } 1410 1411 // C++ [class.dtor]p2: 1412 // A destructor is used to destroy objects of its class type. A 1413 // destructor takes no parameters, and no return type can be 1414 // specified for it (not even void). The address of a destructor 1415 // shall not be taken. A destructor shall not be static. A 1416 // destructor can be invoked for a const, volatile or const 1417 // volatile object. A destructor shall not be declared const, 1418 // volatile or const volatile (9.3.2). 1419 if (SC == FunctionDecl::Static) { 1420 if (!D.isInvalidType()) 1421 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1422 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1423 << SourceRange(D.getIdentifierLoc()); 1424 SC = FunctionDecl::None; 1425 D.setInvalidType(); 1426 } 1427 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1428 // Destructors don't have return types, but the parser will 1429 // happily parse something like: 1430 // 1431 // class X { 1432 // float ~X(); 1433 // }; 1434 // 1435 // The return type will be eliminated later. 1436 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1437 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1438 << SourceRange(D.getIdentifierLoc()); 1439 } 1440 1441 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1442 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1443 if (FTI.TypeQuals & QualType::Const) 1444 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1445 << "const" << SourceRange(D.getIdentifierLoc()); 1446 if (FTI.TypeQuals & QualType::Volatile) 1447 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1448 << "volatile" << SourceRange(D.getIdentifierLoc()); 1449 if (FTI.TypeQuals & QualType::Restrict) 1450 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1451 << "restrict" << SourceRange(D.getIdentifierLoc()); 1452 D.setInvalidType(); 1453 } 1454 1455 // Make sure we don't have any parameters. 1456 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1457 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1458 1459 // Delete the parameters. 1460 FTI.freeArgs(); 1461 D.setInvalidType(); 1462 } 1463 1464 // Make sure the destructor isn't variadic. 1465 if (FTI.isVariadic) { 1466 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1467 D.setInvalidType(); 1468 } 1469 1470 // Rebuild the function type "R" without any type qualifiers or 1471 // parameters (in case any of the errors above fired) and with 1472 // "void" as the return type, since destructors don't have return 1473 // types. We *always* have to do this, because GetTypeForDeclarator 1474 // will put in a result type of "int" when none was specified. 1475 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1476} 1477 1478/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1479/// well-formednes of the conversion function declarator @p D with 1480/// type @p R. If there are any errors in the declarator, this routine 1481/// will emit diagnostics and return true. Otherwise, it will return 1482/// false. Either way, the type @p R will be updated to reflect a 1483/// well-formed type for the conversion operator. 1484void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1485 FunctionDecl::StorageClass& SC) { 1486 // C++ [class.conv.fct]p1: 1487 // Neither parameter types nor return type can be specified. The 1488 // type of a conversion function (8.3.5) is ���function taking no 1489 // parameter returning conversion-type-id.��� 1490 if (SC == FunctionDecl::Static) { 1491 if (!D.isInvalidType()) 1492 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1494 << SourceRange(D.getIdentifierLoc()); 1495 D.setInvalidType(); 1496 SC = FunctionDecl::None; 1497 } 1498 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1499 // Conversion functions don't have return types, but the parser will 1500 // happily parse something like: 1501 // 1502 // class X { 1503 // float operator bool(); 1504 // }; 1505 // 1506 // The return type will be changed later anyway. 1507 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1508 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1509 << SourceRange(D.getIdentifierLoc()); 1510 } 1511 1512 // Make sure we don't have any parameters. 1513 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1514 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1515 1516 // Delete the parameters. 1517 D.getTypeObject(0).Fun.freeArgs(); 1518 D.setInvalidType(); 1519 } 1520 1521 // Make sure the conversion function isn't variadic. 1522 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1523 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1524 D.setInvalidType(); 1525 } 1526 1527 // C++ [class.conv.fct]p4: 1528 // The conversion-type-id shall not represent a function type nor 1529 // an array type. 1530 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1531 if (ConvType->isArrayType()) { 1532 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1533 ConvType = Context.getPointerType(ConvType); 1534 D.setInvalidType(); 1535 } else if (ConvType->isFunctionType()) { 1536 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1537 ConvType = Context.getPointerType(ConvType); 1538 D.setInvalidType(); 1539 } 1540 1541 // Rebuild the function type "R" without any parameters (in case any 1542 // of the errors above fired) and with the conversion type as the 1543 // return type. 1544 R = Context.getFunctionType(ConvType, 0, 0, false, 1545 R->getAsFunctionProtoType()->getTypeQuals()); 1546 1547 // C++0x explicit conversion operators. 1548 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1549 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1550 diag::warn_explicit_conversion_functions) 1551 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1552} 1553 1554/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1555/// the declaration of the given C++ conversion function. This routine 1556/// is responsible for recording the conversion function in the C++ 1557/// class, if possible. 1558Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1559 assert(Conversion && "Expected to receive a conversion function declaration"); 1560 1561 // Set the lexical context of this conversion function 1562 Conversion->setLexicalDeclContext(CurContext); 1563 1564 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1565 1566 // Make sure we aren't redeclaring the conversion function. 1567 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1568 1569 // C++ [class.conv.fct]p1: 1570 // [...] A conversion function is never used to convert a 1571 // (possibly cv-qualified) object to the (possibly cv-qualified) 1572 // same object type (or a reference to it), to a (possibly 1573 // cv-qualified) base class of that type (or a reference to it), 1574 // or to (possibly cv-qualified) void. 1575 // FIXME: Suppress this warning if the conversion function ends up being a 1576 // virtual function that overrides a virtual function in a base class. 1577 QualType ClassType 1578 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1579 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1580 ConvType = ConvTypeRef->getPointeeType(); 1581 if (ConvType->isRecordType()) { 1582 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1583 if (ConvType == ClassType) 1584 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1585 << ClassType; 1586 else if (IsDerivedFrom(ClassType, ConvType)) 1587 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1588 << ClassType << ConvType; 1589 } else if (ConvType->isVoidType()) { 1590 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1591 << ClassType << ConvType; 1592 } 1593 1594 if (Conversion->getPreviousDeclaration()) { 1595 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1596 for (OverloadedFunctionDecl::function_iterator 1597 Conv = Conversions->function_begin(), 1598 ConvEnd = Conversions->function_end(); 1599 Conv != ConvEnd; ++Conv) { 1600 if (*Conv == Conversion->getPreviousDeclaration()) { 1601 *Conv = Conversion; 1602 return DeclPtrTy::make(Conversion); 1603 } 1604 } 1605 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1606 } else 1607 ClassDecl->addConversionFunction(Context, Conversion); 1608 1609 return DeclPtrTy::make(Conversion); 1610} 1611 1612//===----------------------------------------------------------------------===// 1613// Namespace Handling 1614//===----------------------------------------------------------------------===// 1615 1616/// ActOnStartNamespaceDef - This is called at the start of a namespace 1617/// definition. 1618Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1619 SourceLocation IdentLoc, 1620 IdentifierInfo *II, 1621 SourceLocation LBrace) { 1622 NamespaceDecl *Namespc = 1623 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1624 Namespc->setLBracLoc(LBrace); 1625 1626 Scope *DeclRegionScope = NamespcScope->getParent(); 1627 1628 if (II) { 1629 // C++ [namespace.def]p2: 1630 // The identifier in an original-namespace-definition shall not have been 1631 // previously defined in the declarative region in which the 1632 // original-namespace-definition appears. The identifier in an 1633 // original-namespace-definition is the name of the namespace. Subsequently 1634 // in that declarative region, it is treated as an original-namespace-name. 1635 1636 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1637 true); 1638 1639 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1640 // This is an extended namespace definition. 1641 // Attach this namespace decl to the chain of extended namespace 1642 // definitions. 1643 OrigNS->setNextNamespace(Namespc); 1644 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1645 1646 // Remove the previous declaration from the scope. 1647 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1648 IdResolver.RemoveDecl(OrigNS); 1649 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1650 } 1651 } else if (PrevDecl) { 1652 // This is an invalid name redefinition. 1653 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1654 << Namespc->getDeclName(); 1655 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1656 Namespc->setInvalidDecl(); 1657 // Continue on to push Namespc as current DeclContext and return it. 1658 } 1659 1660 PushOnScopeChains(Namespc, DeclRegionScope); 1661 } else { 1662 // FIXME: Handle anonymous namespaces 1663 } 1664 1665 // Although we could have an invalid decl (i.e. the namespace name is a 1666 // redefinition), push it as current DeclContext and try to continue parsing. 1667 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1668 // for the namespace has the declarations that showed up in that particular 1669 // namespace definition. 1670 PushDeclContext(NamespcScope, Namespc); 1671 return DeclPtrTy::make(Namespc); 1672} 1673 1674/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1675/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1676void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1677 Decl *Dcl = D.getAs<Decl>(); 1678 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1679 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1680 Namespc->setRBracLoc(RBrace); 1681 PopDeclContext(); 1682} 1683 1684Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1685 SourceLocation UsingLoc, 1686 SourceLocation NamespcLoc, 1687 const CXXScopeSpec &SS, 1688 SourceLocation IdentLoc, 1689 IdentifierInfo *NamespcName, 1690 AttributeList *AttrList) { 1691 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1692 assert(NamespcName && "Invalid NamespcName."); 1693 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1694 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1695 1696 UsingDirectiveDecl *UDir = 0; 1697 1698 // Lookup namespace name. 1699 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1700 LookupNamespaceName, false); 1701 if (R.isAmbiguous()) { 1702 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1703 return DeclPtrTy(); 1704 } 1705 if (NamedDecl *NS = R) { 1706 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1707 // C++ [namespace.udir]p1: 1708 // A using-directive specifies that the names in the nominated 1709 // namespace can be used in the scope in which the 1710 // using-directive appears after the using-directive. During 1711 // unqualified name lookup (3.4.1), the names appear as if they 1712 // were declared in the nearest enclosing namespace which 1713 // contains both the using-directive and the nominated 1714 // namespace. [Note: in this context, ���contains��� means ���contains 1715 // directly or indirectly���. ] 1716 1717 // Find enclosing context containing both using-directive and 1718 // nominated namespace. 1719 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1720 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1721 CommonAncestor = CommonAncestor->getParent(); 1722 1723 UDir = UsingDirectiveDecl::Create(Context, 1724 CurContext, UsingLoc, 1725 NamespcLoc, 1726 SS.getRange(), 1727 (NestedNameSpecifier *)SS.getScopeRep(), 1728 IdentLoc, 1729 cast<NamespaceDecl>(NS), 1730 CommonAncestor); 1731 PushUsingDirective(S, UDir); 1732 } else { 1733 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1734 } 1735 1736 // FIXME: We ignore attributes for now. 1737 delete AttrList; 1738 return DeclPtrTy::make(UDir); 1739} 1740 1741void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1742 // If scope has associated entity, then using directive is at namespace 1743 // or translation unit scope. We add UsingDirectiveDecls, into 1744 // it's lookup structure. 1745 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1746 Ctx->addDecl(Context, UDir); 1747 else 1748 // Otherwise it is block-sope. using-directives will affect lookup 1749 // only to the end of scope. 1750 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1751} 1752 1753/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1754/// is a namespace alias, returns the namespace it points to. 1755static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1756 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1757 return AD->getNamespace(); 1758 return dyn_cast_or_null<NamespaceDecl>(D); 1759} 1760 1761Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1762 SourceLocation NamespaceLoc, 1763 SourceLocation AliasLoc, 1764 IdentifierInfo *Alias, 1765 const CXXScopeSpec &SS, 1766 SourceLocation IdentLoc, 1767 IdentifierInfo *Ident) { 1768 1769 // Lookup the namespace name. 1770 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1771 1772 // Check if we have a previous declaration with the same name. 1773 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1774 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1775 // We already have an alias with the same name that points to the same 1776 // namespace, so don't create a new one. 1777 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1778 return DeclPtrTy(); 1779 } 1780 1781 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1782 diag::err_redefinition_different_kind; 1783 Diag(AliasLoc, DiagID) << Alias; 1784 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1785 return DeclPtrTy(); 1786 } 1787 1788 if (R.isAmbiguous()) { 1789 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1790 return DeclPtrTy(); 1791 } 1792 1793 if (!R) { 1794 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1795 return DeclPtrTy(); 1796 } 1797 1798 NamespaceAliasDecl *AliasDecl = 1799 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1800 Alias, SS.getRange(), 1801 (NestedNameSpecifier *)SS.getScopeRep(), 1802 IdentLoc, R); 1803 1804 CurContext->addDecl(Context, AliasDecl); 1805 return DeclPtrTy::make(AliasDecl); 1806} 1807 1808void Sema::InitializeVarWithConstructor(VarDecl *VD, 1809 CXXConstructorDecl *Constructor, 1810 QualType DeclInitType, 1811 Expr **Exprs, unsigned NumExprs) { 1812 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 1813 false, Exprs, NumExprs); 1814 VD->setInit(Context, Temp); 1815} 1816 1817/// AddCXXDirectInitializerToDecl - This action is called immediately after 1818/// ActOnDeclarator, when a C++ direct initializer is present. 1819/// e.g: "int x(1);" 1820void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1821 SourceLocation LParenLoc, 1822 MultiExprArg Exprs, 1823 SourceLocation *CommaLocs, 1824 SourceLocation RParenLoc) { 1825 unsigned NumExprs = Exprs.size(); 1826 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1827 Decl *RealDecl = Dcl.getAs<Decl>(); 1828 1829 // If there is no declaration, there was an error parsing it. Just ignore 1830 // the initializer. 1831 if (RealDecl == 0) 1832 return; 1833 1834 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1835 if (!VDecl) { 1836 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1837 RealDecl->setInvalidDecl(); 1838 return; 1839 } 1840 1841 // FIXME: Need to handle dependent types and expressions here. 1842 1843 // We will treat direct-initialization as a copy-initialization: 1844 // int x(1); -as-> int x = 1; 1845 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1846 // 1847 // Clients that want to distinguish between the two forms, can check for 1848 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1849 // A major benefit is that clients that don't particularly care about which 1850 // exactly form was it (like the CodeGen) can handle both cases without 1851 // special case code. 1852 1853 // C++ 8.5p11: 1854 // The form of initialization (using parentheses or '=') is generally 1855 // insignificant, but does matter when the entity being initialized has a 1856 // class type. 1857 QualType DeclInitType = VDecl->getType(); 1858 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1859 DeclInitType = Array->getElementType(); 1860 1861 // FIXME: This isn't the right place to complete the type. 1862 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1863 diag::err_typecheck_decl_incomplete_type)) { 1864 VDecl->setInvalidDecl(); 1865 return; 1866 } 1867 1868 if (VDecl->getType()->isRecordType()) { 1869 CXXConstructorDecl *Constructor 1870 = PerformInitializationByConstructor(DeclInitType, 1871 (Expr **)Exprs.get(), NumExprs, 1872 VDecl->getLocation(), 1873 SourceRange(VDecl->getLocation(), 1874 RParenLoc), 1875 VDecl->getDeclName(), 1876 IK_Direct); 1877 if (!Constructor) 1878 RealDecl->setInvalidDecl(); 1879 else { 1880 VDecl->setCXXDirectInitializer(true); 1881 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 1882 (Expr**)Exprs.release(), NumExprs); 1883 } 1884 return; 1885 } 1886 1887 if (NumExprs > 1) { 1888 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1889 << SourceRange(VDecl->getLocation(), RParenLoc); 1890 RealDecl->setInvalidDecl(); 1891 return; 1892 } 1893 1894 // Let clients know that initialization was done with a direct initializer. 1895 VDecl->setCXXDirectInitializer(true); 1896 1897 assert(NumExprs == 1 && "Expected 1 expression"); 1898 // Set the init expression, handles conversions. 1899 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1900 /*DirectInit=*/true); 1901} 1902 1903/// PerformInitializationByConstructor - Perform initialization by 1904/// constructor (C++ [dcl.init]p14), which may occur as part of 1905/// direct-initialization or copy-initialization. We are initializing 1906/// an object of type @p ClassType with the given arguments @p 1907/// Args. @p Loc is the location in the source code where the 1908/// initializer occurs (e.g., a declaration, member initializer, 1909/// functional cast, etc.) while @p Range covers the whole 1910/// initialization. @p InitEntity is the entity being initialized, 1911/// which may by the name of a declaration or a type. @p Kind is the 1912/// kind of initialization we're performing, which affects whether 1913/// explicit constructors will be considered. When successful, returns 1914/// the constructor that will be used to perform the initialization; 1915/// when the initialization fails, emits a diagnostic and returns 1916/// null. 1917CXXConstructorDecl * 1918Sema::PerformInitializationByConstructor(QualType ClassType, 1919 Expr **Args, unsigned NumArgs, 1920 SourceLocation Loc, SourceRange Range, 1921 DeclarationName InitEntity, 1922 InitializationKind Kind) { 1923 const RecordType *ClassRec = ClassType->getAsRecordType(); 1924 assert(ClassRec && "Can only initialize a class type here"); 1925 1926 // C++ [dcl.init]p14: 1927 // 1928 // If the initialization is direct-initialization, or if it is 1929 // copy-initialization where the cv-unqualified version of the 1930 // source type is the same class as, or a derived class of, the 1931 // class of the destination, constructors are considered. The 1932 // applicable constructors are enumerated (13.3.1.3), and the 1933 // best one is chosen through overload resolution (13.3). The 1934 // constructor so selected is called to initialize the object, 1935 // with the initializer expression(s) as its argument(s). If no 1936 // constructor applies, or the overload resolution is ambiguous, 1937 // the initialization is ill-formed. 1938 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1939 OverloadCandidateSet CandidateSet; 1940 1941 // Add constructors to the overload set. 1942 DeclarationName ConstructorName 1943 = Context.DeclarationNames.getCXXConstructorName( 1944 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1945 DeclContext::lookup_const_iterator Con, ConEnd; 1946 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1947 Con != ConEnd; ++Con) { 1948 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1949 if ((Kind == IK_Direct) || 1950 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1951 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1952 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1953 } 1954 1955 // FIXME: When we decide not to synthesize the implicitly-declared 1956 // constructors, we'll need to make them appear here. 1957 1958 OverloadCandidateSet::iterator Best; 1959 switch (BestViableFunction(CandidateSet, Best)) { 1960 case OR_Success: 1961 // We found a constructor. Return it. 1962 return cast<CXXConstructorDecl>(Best->Function); 1963 1964 case OR_No_Viable_Function: 1965 if (InitEntity) 1966 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1967 << InitEntity << Range; 1968 else 1969 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1970 << ClassType << Range; 1971 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1972 return 0; 1973 1974 case OR_Ambiguous: 1975 if (InitEntity) 1976 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1977 else 1978 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1979 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1980 return 0; 1981 1982 case OR_Deleted: 1983 if (InitEntity) 1984 Diag(Loc, diag::err_ovl_deleted_init) 1985 << Best->Function->isDeleted() 1986 << InitEntity << Range; 1987 else 1988 Diag(Loc, diag::err_ovl_deleted_init) 1989 << Best->Function->isDeleted() 1990 << InitEntity << Range; 1991 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1992 return 0; 1993 } 1994 1995 return 0; 1996} 1997 1998/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1999/// determine whether they are reference-related, 2000/// reference-compatible, reference-compatible with added 2001/// qualification, or incompatible, for use in C++ initialization by 2002/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2003/// type, and the first type (T1) is the pointee type of the reference 2004/// type being initialized. 2005Sema::ReferenceCompareResult 2006Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2007 bool& DerivedToBase) { 2008 assert(!T1->isReferenceType() && 2009 "T1 must be the pointee type of the reference type"); 2010 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2011 2012 T1 = Context.getCanonicalType(T1); 2013 T2 = Context.getCanonicalType(T2); 2014 QualType UnqualT1 = T1.getUnqualifiedType(); 2015 QualType UnqualT2 = T2.getUnqualifiedType(); 2016 2017 // C++ [dcl.init.ref]p4: 2018 // Given types ���cv1 T1��� and ���cv2 T2,��� ���cv1 T1��� is 2019 // reference-related to ���cv2 T2��� if T1 is the same type as T2, or 2020 // T1 is a base class of T2. 2021 if (UnqualT1 == UnqualT2) 2022 DerivedToBase = false; 2023 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2024 DerivedToBase = true; 2025 else 2026 return Ref_Incompatible; 2027 2028 // At this point, we know that T1 and T2 are reference-related (at 2029 // least). 2030 2031 // C++ [dcl.init.ref]p4: 2032 // "cv1 T1��� is reference-compatible with ���cv2 T2��� if T1 is 2033 // reference-related to T2 and cv1 is the same cv-qualification 2034 // as, or greater cv-qualification than, cv2. For purposes of 2035 // overload resolution, cases for which cv1 is greater 2036 // cv-qualification than cv2 are identified as 2037 // reference-compatible with added qualification (see 13.3.3.2). 2038 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2039 return Ref_Compatible; 2040 else if (T1.isMoreQualifiedThan(T2)) 2041 return Ref_Compatible_With_Added_Qualification; 2042 else 2043 return Ref_Related; 2044} 2045 2046/// CheckReferenceInit - Check the initialization of a reference 2047/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2048/// the initializer (either a simple initializer or an initializer 2049/// list), and DeclType is the type of the declaration. When ICS is 2050/// non-null, this routine will compute the implicit conversion 2051/// sequence according to C++ [over.ics.ref] and will not produce any 2052/// diagnostics; when ICS is null, it will emit diagnostics when any 2053/// errors are found. Either way, a return value of true indicates 2054/// that there was a failure, a return value of false indicates that 2055/// the reference initialization succeeded. 2056/// 2057/// When @p SuppressUserConversions, user-defined conversions are 2058/// suppressed. 2059/// When @p AllowExplicit, we also permit explicit user-defined 2060/// conversion functions. 2061/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2062bool 2063Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2064 ImplicitConversionSequence *ICS, 2065 bool SuppressUserConversions, 2066 bool AllowExplicit, bool ForceRValue) { 2067 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2068 2069 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2070 QualType T2 = Init->getType(); 2071 2072 // If the initializer is the address of an overloaded function, try 2073 // to resolve the overloaded function. If all goes well, T2 is the 2074 // type of the resulting function. 2075 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2076 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2077 ICS != 0); 2078 if (Fn) { 2079 // Since we're performing this reference-initialization for 2080 // real, update the initializer with the resulting function. 2081 if (!ICS) { 2082 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2083 return true; 2084 2085 FixOverloadedFunctionReference(Init, Fn); 2086 } 2087 2088 T2 = Fn->getType(); 2089 } 2090 } 2091 2092 // Compute some basic properties of the types and the initializer. 2093 bool isRValRef = DeclType->isRValueReferenceType(); 2094 bool DerivedToBase = false; 2095 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2096 Init->isLvalue(Context); 2097 ReferenceCompareResult RefRelationship 2098 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2099 2100 // Most paths end in a failed conversion. 2101 if (ICS) 2102 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2103 2104 // C++ [dcl.init.ref]p5: 2105 // A reference to type ���cv1 T1��� is initialized by an expression 2106 // of type ���cv2 T2��� as follows: 2107 2108 // -- If the initializer expression 2109 2110 // Rvalue references cannot bind to lvalues (N2812). 2111 // There is absolutely no situation where they can. In particular, note that 2112 // this is ill-formed, even if B has a user-defined conversion to A&&: 2113 // B b; 2114 // A&& r = b; 2115 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2116 if (!ICS) 2117 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2118 << Init->getSourceRange(); 2119 return true; 2120 } 2121 2122 bool BindsDirectly = false; 2123 // -- is an lvalue (but is not a bit-field), and ���cv1 T1��� is 2124 // reference-compatible with ���cv2 T2,��� or 2125 // 2126 // Note that the bit-field check is skipped if we are just computing 2127 // the implicit conversion sequence (C++ [over.best.ics]p2). 2128 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2129 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2130 BindsDirectly = true; 2131 2132 if (ICS) { 2133 // C++ [over.ics.ref]p1: 2134 // When a parameter of reference type binds directly (8.5.3) 2135 // to an argument expression, the implicit conversion sequence 2136 // is the identity conversion, unless the argument expression 2137 // has a type that is a derived class of the parameter type, 2138 // in which case the implicit conversion sequence is a 2139 // derived-to-base Conversion (13.3.3.1). 2140 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2141 ICS->Standard.First = ICK_Identity; 2142 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2143 ICS->Standard.Third = ICK_Identity; 2144 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2145 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2146 ICS->Standard.ReferenceBinding = true; 2147 ICS->Standard.DirectBinding = true; 2148 ICS->Standard.RRefBinding = false; 2149 ICS->Standard.CopyConstructor = 0; 2150 2151 // Nothing more to do: the inaccessibility/ambiguity check for 2152 // derived-to-base conversions is suppressed when we're 2153 // computing the implicit conversion sequence (C++ 2154 // [over.best.ics]p2). 2155 return false; 2156 } else { 2157 // Perform the conversion. 2158 // FIXME: Binding to a subobject of the lvalue is going to require more 2159 // AST annotation than this. 2160 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2161 } 2162 } 2163 2164 // -- has a class type (i.e., T2 is a class type) and can be 2165 // implicitly converted to an lvalue of type ���cv3 T3,��� 2166 // where ���cv1 T1��� is reference-compatible with ���cv3 T3��� 2167 // 92) (this conversion is selected by enumerating the 2168 // applicable conversion functions (13.3.1.6) and choosing 2169 // the best one through overload resolution (13.3)), 2170 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2171 // FIXME: Look for conversions in base classes! 2172 CXXRecordDecl *T2RecordDecl 2173 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2174 2175 OverloadCandidateSet CandidateSet; 2176 OverloadedFunctionDecl *Conversions 2177 = T2RecordDecl->getConversionFunctions(); 2178 for (OverloadedFunctionDecl::function_iterator Func 2179 = Conversions->function_begin(); 2180 Func != Conversions->function_end(); ++Func) { 2181 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2182 2183 // If the conversion function doesn't return a reference type, 2184 // it can't be considered for this conversion. 2185 if (Conv->getConversionType()->isLValueReferenceType() && 2186 (AllowExplicit || !Conv->isExplicit())) 2187 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2188 } 2189 2190 OverloadCandidateSet::iterator Best; 2191 switch (BestViableFunction(CandidateSet, Best)) { 2192 case OR_Success: 2193 // This is a direct binding. 2194 BindsDirectly = true; 2195 2196 if (ICS) { 2197 // C++ [over.ics.ref]p1: 2198 // 2199 // [...] If the parameter binds directly to the result of 2200 // applying a conversion function to the argument 2201 // expression, the implicit conversion sequence is a 2202 // user-defined conversion sequence (13.3.3.1.2), with the 2203 // second standard conversion sequence either an identity 2204 // conversion or, if the conversion function returns an 2205 // entity of a type that is a derived class of the parameter 2206 // type, a derived-to-base Conversion. 2207 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2208 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2209 ICS->UserDefined.After = Best->FinalConversion; 2210 ICS->UserDefined.ConversionFunction = Best->Function; 2211 assert(ICS->UserDefined.After.ReferenceBinding && 2212 ICS->UserDefined.After.DirectBinding && 2213 "Expected a direct reference binding!"); 2214 return false; 2215 } else { 2216 // Perform the conversion. 2217 // FIXME: Binding to a subobject of the lvalue is going to require more 2218 // AST annotation than this. 2219 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2220 } 2221 break; 2222 2223 case OR_Ambiguous: 2224 assert(false && "Ambiguous reference binding conversions not implemented."); 2225 return true; 2226 2227 case OR_No_Viable_Function: 2228 case OR_Deleted: 2229 // There was no suitable conversion, or we found a deleted 2230 // conversion; continue with other checks. 2231 break; 2232 } 2233 } 2234 2235 if (BindsDirectly) { 2236 // C++ [dcl.init.ref]p4: 2237 // [...] In all cases where the reference-related or 2238 // reference-compatible relationship of two types is used to 2239 // establish the validity of a reference binding, and T1 is a 2240 // base class of T2, a program that necessitates such a binding 2241 // is ill-formed if T1 is an inaccessible (clause 11) or 2242 // ambiguous (10.2) base class of T2. 2243 // 2244 // Note that we only check this condition when we're allowed to 2245 // complain about errors, because we should not be checking for 2246 // ambiguity (or inaccessibility) unless the reference binding 2247 // actually happens. 2248 if (DerivedToBase) 2249 return CheckDerivedToBaseConversion(T2, T1, 2250 Init->getSourceRange().getBegin(), 2251 Init->getSourceRange()); 2252 else 2253 return false; 2254 } 2255 2256 // -- Otherwise, the reference shall be to a non-volatile const 2257 // type (i.e., cv1 shall be const), or the reference shall be an 2258 // rvalue reference and the initializer expression shall be an rvalue. 2259 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2260 if (!ICS) 2261 Diag(Init->getSourceRange().getBegin(), 2262 diag::err_not_reference_to_const_init) 2263 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2264 << T2 << Init->getSourceRange(); 2265 return true; 2266 } 2267 2268 // -- If the initializer expression is an rvalue, with T2 a 2269 // class type, and ���cv1 T1��� is reference-compatible with 2270 // ���cv2 T2,��� the reference is bound in one of the 2271 // following ways (the choice is implementation-defined): 2272 // 2273 // -- The reference is bound to the object represented by 2274 // the rvalue (see 3.10) or to a sub-object within that 2275 // object. 2276 // 2277 // -- A temporary of type ���cv1 T2��� [sic] is created, and 2278 // a constructor is called to copy the entire rvalue 2279 // object into the temporary. The reference is bound to 2280 // the temporary or to a sub-object within the 2281 // temporary. 2282 // 2283 // The constructor that would be used to make the copy 2284 // shall be callable whether or not the copy is actually 2285 // done. 2286 // 2287 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2288 // freedom, so we will always take the first option and never build 2289 // a temporary in this case. FIXME: We will, however, have to check 2290 // for the presence of a copy constructor in C++98/03 mode. 2291 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2292 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2293 if (ICS) { 2294 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2295 ICS->Standard.First = ICK_Identity; 2296 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2297 ICS->Standard.Third = ICK_Identity; 2298 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2299 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2300 ICS->Standard.ReferenceBinding = true; 2301 ICS->Standard.DirectBinding = false; 2302 ICS->Standard.RRefBinding = isRValRef; 2303 ICS->Standard.CopyConstructor = 0; 2304 } else { 2305 // FIXME: Binding to a subobject of the rvalue is going to require more 2306 // AST annotation than this. 2307 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2308 } 2309 return false; 2310 } 2311 2312 // -- Otherwise, a temporary of type ���cv1 T1��� is created and 2313 // initialized from the initializer expression using the 2314 // rules for a non-reference copy initialization (8.5). The 2315 // reference is then bound to the temporary. If T1 is 2316 // reference-related to T2, cv1 must be the same 2317 // cv-qualification as, or greater cv-qualification than, 2318 // cv2; otherwise, the program is ill-formed. 2319 if (RefRelationship == Ref_Related) { 2320 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2321 // we would be reference-compatible or reference-compatible with 2322 // added qualification. But that wasn't the case, so the reference 2323 // initialization fails. 2324 if (!ICS) 2325 Diag(Init->getSourceRange().getBegin(), 2326 diag::err_reference_init_drops_quals) 2327 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2328 << T2 << Init->getSourceRange(); 2329 return true; 2330 } 2331 2332 // If at least one of the types is a class type, the types are not 2333 // related, and we aren't allowed any user conversions, the 2334 // reference binding fails. This case is important for breaking 2335 // recursion, since TryImplicitConversion below will attempt to 2336 // create a temporary through the use of a copy constructor. 2337 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2338 (T1->isRecordType() || T2->isRecordType())) { 2339 if (!ICS) 2340 Diag(Init->getSourceRange().getBegin(), 2341 diag::err_typecheck_convert_incompatible) 2342 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2343 return true; 2344 } 2345 2346 // Actually try to convert the initializer to T1. 2347 if (ICS) { 2348 // C++ [over.ics.ref]p2: 2349 // 2350 // When a parameter of reference type is not bound directly to 2351 // an argument expression, the conversion sequence is the one 2352 // required to convert the argument expression to the 2353 // underlying type of the reference according to 2354 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2355 // to copy-initializing a temporary of the underlying type with 2356 // the argument expression. Any difference in top-level 2357 // cv-qualification is subsumed by the initialization itself 2358 // and does not constitute a conversion. 2359 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2360 // Of course, that's still a reference binding. 2361 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2362 ICS->Standard.ReferenceBinding = true; 2363 ICS->Standard.RRefBinding = isRValRef; 2364 } else if(ICS->ConversionKind == 2365 ImplicitConversionSequence::UserDefinedConversion) { 2366 ICS->UserDefined.After.ReferenceBinding = true; 2367 ICS->UserDefined.After.RRefBinding = isRValRef; 2368 } 2369 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2370 } else { 2371 return PerformImplicitConversion(Init, T1, "initializing"); 2372 } 2373} 2374 2375/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2376/// of this overloaded operator is well-formed. If so, returns false; 2377/// otherwise, emits appropriate diagnostics and returns true. 2378bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2379 assert(FnDecl && FnDecl->isOverloadedOperator() && 2380 "Expected an overloaded operator declaration"); 2381 2382 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2383 2384 // C++ [over.oper]p5: 2385 // The allocation and deallocation functions, operator new, 2386 // operator new[], operator delete and operator delete[], are 2387 // described completely in 3.7.3. The attributes and restrictions 2388 // found in the rest of this subclause do not apply to them unless 2389 // explicitly stated in 3.7.3. 2390 // FIXME: Write a separate routine for checking this. For now, just allow it. 2391 if (Op == OO_New || Op == OO_Array_New || 2392 Op == OO_Delete || Op == OO_Array_Delete) 2393 return false; 2394 2395 // C++ [over.oper]p6: 2396 // An operator function shall either be a non-static member 2397 // function or be a non-member function and have at least one 2398 // parameter whose type is a class, a reference to a class, an 2399 // enumeration, or a reference to an enumeration. 2400 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2401 if (MethodDecl->isStatic()) 2402 return Diag(FnDecl->getLocation(), 2403 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2404 } else { 2405 bool ClassOrEnumParam = false; 2406 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2407 ParamEnd = FnDecl->param_end(); 2408 Param != ParamEnd; ++Param) { 2409 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2410 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2411 ClassOrEnumParam = true; 2412 break; 2413 } 2414 } 2415 2416 if (!ClassOrEnumParam) 2417 return Diag(FnDecl->getLocation(), 2418 diag::err_operator_overload_needs_class_or_enum) 2419 << FnDecl->getDeclName(); 2420 } 2421 2422 // C++ [over.oper]p8: 2423 // An operator function cannot have default arguments (8.3.6), 2424 // except where explicitly stated below. 2425 // 2426 // Only the function-call operator allows default arguments 2427 // (C++ [over.call]p1). 2428 if (Op != OO_Call) { 2429 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2430 Param != FnDecl->param_end(); ++Param) { 2431 if ((*Param)->hasUnparsedDefaultArg()) 2432 return Diag((*Param)->getLocation(), 2433 diag::err_operator_overload_default_arg) 2434 << FnDecl->getDeclName(); 2435 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2436 return Diag((*Param)->getLocation(), 2437 diag::err_operator_overload_default_arg) 2438 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2439 } 2440 } 2441 2442 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2443 { false, false, false } 2444#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2445 , { Unary, Binary, MemberOnly } 2446#include "clang/Basic/OperatorKinds.def" 2447 }; 2448 2449 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2450 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2451 bool MustBeMemberOperator = OperatorUses[Op][2]; 2452 2453 // C++ [over.oper]p8: 2454 // [...] Operator functions cannot have more or fewer parameters 2455 // than the number required for the corresponding operator, as 2456 // described in the rest of this subclause. 2457 unsigned NumParams = FnDecl->getNumParams() 2458 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2459 if (Op != OO_Call && 2460 ((NumParams == 1 && !CanBeUnaryOperator) || 2461 (NumParams == 2 && !CanBeBinaryOperator) || 2462 (NumParams < 1) || (NumParams > 2))) { 2463 // We have the wrong number of parameters. 2464 unsigned ErrorKind; 2465 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2466 ErrorKind = 2; // 2 -> unary or binary. 2467 } else if (CanBeUnaryOperator) { 2468 ErrorKind = 0; // 0 -> unary 2469 } else { 2470 assert(CanBeBinaryOperator && 2471 "All non-call overloaded operators are unary or binary!"); 2472 ErrorKind = 1; // 1 -> binary 2473 } 2474 2475 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2476 << FnDecl->getDeclName() << NumParams << ErrorKind; 2477 } 2478 2479 // Overloaded operators other than operator() cannot be variadic. 2480 if (Op != OO_Call && 2481 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2482 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2483 << FnDecl->getDeclName(); 2484 } 2485 2486 // Some operators must be non-static member functions. 2487 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2488 return Diag(FnDecl->getLocation(), 2489 diag::err_operator_overload_must_be_member) 2490 << FnDecl->getDeclName(); 2491 } 2492 2493 // C++ [over.inc]p1: 2494 // The user-defined function called operator++ implements the 2495 // prefix and postfix ++ operator. If this function is a member 2496 // function with no parameters, or a non-member function with one 2497 // parameter of class or enumeration type, it defines the prefix 2498 // increment operator ++ for objects of that type. If the function 2499 // is a member function with one parameter (which shall be of type 2500 // int) or a non-member function with two parameters (the second 2501 // of which shall be of type int), it defines the postfix 2502 // increment operator ++ for objects of that type. 2503 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2504 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2505 bool ParamIsInt = false; 2506 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2507 ParamIsInt = BT->getKind() == BuiltinType::Int; 2508 2509 if (!ParamIsInt) 2510 return Diag(LastParam->getLocation(), 2511 diag::err_operator_overload_post_incdec_must_be_int) 2512 << LastParam->getType() << (Op == OO_MinusMinus); 2513 } 2514 2515 // Notify the class if it got an assignment operator. 2516 if (Op == OO_Equal) { 2517 // Would have returned earlier otherwise. 2518 assert(isa<CXXMethodDecl>(FnDecl) && 2519 "Overloaded = not member, but not filtered."); 2520 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2521 Method->getParent()->addedAssignmentOperator(Context, Method); 2522 } 2523 2524 return false; 2525} 2526 2527/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2528/// linkage specification, including the language and (if present) 2529/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2530/// the location of the language string literal, which is provided 2531/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2532/// the '{' brace. Otherwise, this linkage specification does not 2533/// have any braces. 2534Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2535 SourceLocation ExternLoc, 2536 SourceLocation LangLoc, 2537 const char *Lang, 2538 unsigned StrSize, 2539 SourceLocation LBraceLoc) { 2540 LinkageSpecDecl::LanguageIDs Language; 2541 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2542 Language = LinkageSpecDecl::lang_c; 2543 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2544 Language = LinkageSpecDecl::lang_cxx; 2545 else { 2546 Diag(LangLoc, diag::err_bad_language); 2547 return DeclPtrTy(); 2548 } 2549 2550 // FIXME: Add all the various semantics of linkage specifications 2551 2552 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2553 LangLoc, Language, 2554 LBraceLoc.isValid()); 2555 CurContext->addDecl(Context, D); 2556 PushDeclContext(S, D); 2557 return DeclPtrTy::make(D); 2558} 2559 2560/// ActOnFinishLinkageSpecification - Completely the definition of 2561/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2562/// valid, it's the position of the closing '}' brace in a linkage 2563/// specification that uses braces. 2564Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2565 DeclPtrTy LinkageSpec, 2566 SourceLocation RBraceLoc) { 2567 if (LinkageSpec) 2568 PopDeclContext(); 2569 return LinkageSpec; 2570} 2571 2572/// \brief Perform semantic analysis for the variable declaration that 2573/// occurs within a C++ catch clause, returning the newly-created 2574/// variable. 2575VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2576 IdentifierInfo *Name, 2577 SourceLocation Loc, 2578 SourceRange Range) { 2579 bool Invalid = false; 2580 2581 // Arrays and functions decay. 2582 if (ExDeclType->isArrayType()) 2583 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2584 else if (ExDeclType->isFunctionType()) 2585 ExDeclType = Context.getPointerType(ExDeclType); 2586 2587 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2588 // The exception-declaration shall not denote a pointer or reference to an 2589 // incomplete type, other than [cv] void*. 2590 // N2844 forbids rvalue references. 2591 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2592 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2593 Invalid = true; 2594 } 2595 2596 QualType BaseType = ExDeclType; 2597 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2598 unsigned DK = diag::err_catch_incomplete; 2599 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2600 BaseType = Ptr->getPointeeType(); 2601 Mode = 1; 2602 DK = diag::err_catch_incomplete_ptr; 2603 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2604 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2605 BaseType = Ref->getPointeeType(); 2606 Mode = 2; 2607 DK = diag::err_catch_incomplete_ref; 2608 } 2609 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2610 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2611 Invalid = true; 2612 2613 if (!Invalid && !ExDeclType->isDependentType() && 2614 RequireNonAbstractType(Loc, ExDeclType, 2615 diag::err_abstract_type_in_decl, 2616 AbstractVariableType)) 2617 Invalid = true; 2618 2619 // FIXME: Need to test for ability to copy-construct and destroy the 2620 // exception variable. 2621 2622 // FIXME: Need to check for abstract classes. 2623 2624 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2625 Name, ExDeclType, VarDecl::None, 2626 Range.getBegin()); 2627 2628 if (Invalid) 2629 ExDecl->setInvalidDecl(); 2630 2631 return ExDecl; 2632} 2633 2634/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2635/// handler. 2636Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2637 QualType ExDeclType = GetTypeForDeclarator(D, S); 2638 2639 bool Invalid = D.isInvalidType(); 2640 IdentifierInfo *II = D.getIdentifier(); 2641 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2642 // The scope should be freshly made just for us. There is just no way 2643 // it contains any previous declaration. 2644 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2645 if (PrevDecl->isTemplateParameter()) { 2646 // Maybe we will complain about the shadowed template parameter. 2647 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2648 } 2649 } 2650 2651 if (D.getCXXScopeSpec().isSet() && !Invalid) { 2652 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2653 << D.getCXXScopeSpec().getRange(); 2654 Invalid = true; 2655 } 2656 2657 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 2658 D.getIdentifier(), 2659 D.getIdentifierLoc(), 2660 D.getDeclSpec().getSourceRange()); 2661 2662 if (Invalid) 2663 ExDecl->setInvalidDecl(); 2664 2665 // Add the exception declaration into this scope. 2666 if (II) 2667 PushOnScopeChains(ExDecl, S); 2668 else 2669 CurContext->addDecl(Context, ExDecl); 2670 2671 ProcessDeclAttributes(ExDecl, D); 2672 return DeclPtrTy::make(ExDecl); 2673} 2674 2675Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2676 ExprArg assertexpr, 2677 ExprArg assertmessageexpr) { 2678 Expr *AssertExpr = (Expr *)assertexpr.get(); 2679 StringLiteral *AssertMessage = 2680 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2681 2682 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2683 llvm::APSInt Value(32); 2684 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2685 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2686 AssertExpr->getSourceRange(); 2687 return DeclPtrTy(); 2688 } 2689 2690 if (Value == 0) { 2691 std::string str(AssertMessage->getStrData(), 2692 AssertMessage->getByteLength()); 2693 Diag(AssertLoc, diag::err_static_assert_failed) 2694 << str << AssertExpr->getSourceRange(); 2695 } 2696 } 2697 2698 assertexpr.release(); 2699 assertmessageexpr.release(); 2700 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2701 AssertExpr, AssertMessage); 2702 2703 CurContext->addDecl(Context, Decl); 2704 return DeclPtrTy::make(Decl); 2705} 2706 2707bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 2708 if (!(S->getFlags() & Scope::ClassScope)) { 2709 Diag(FriendLoc, diag::err_friend_decl_outside_class); 2710 return true; 2711 } 2712 2713 return false; 2714} 2715 2716void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2717 Decl *Dcl = dcl.getAs<Decl>(); 2718 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2719 if (!Fn) { 2720 Diag(DelLoc, diag::err_deleted_non_function); 2721 return; 2722 } 2723 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2724 Diag(DelLoc, diag::err_deleted_decl_not_first); 2725 Diag(Prev->getLocation(), diag::note_previous_declaration); 2726 // If the declaration wasn't the first, we delete the function anyway for 2727 // recovery. 2728 } 2729 Fn->setDeleted(); 2730} 2731 2732static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 2733 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 2734 ++CI) { 2735 Stmt *SubStmt = *CI; 2736 if (!SubStmt) 2737 continue; 2738 if (isa<ReturnStmt>(SubStmt)) 2739 Self.Diag(SubStmt->getSourceRange().getBegin(), 2740 diag::err_return_in_constructor_handler); 2741 if (!isa<Expr>(SubStmt)) 2742 SearchForReturnInStmt(Self, SubStmt); 2743 } 2744} 2745 2746void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 2747 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 2748 CXXCatchStmt *Handler = TryBlock->getHandler(I); 2749 SearchForReturnInStmt(*this, Handler); 2750 } 2751} 2752 2753bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 2754 const CXXMethodDecl *Old) { 2755 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 2756 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 2757 2758 QualType CNewTy = Context.getCanonicalType(NewTy); 2759 QualType COldTy = Context.getCanonicalType(OldTy); 2760 2761 if (CNewTy == COldTy && 2762 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 2763 return false; 2764 2765 // Check if the return types are covariant 2766 QualType NewClassTy, OldClassTy; 2767 2768 /// Both types must be pointers or references to classes. 2769 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 2770 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 2771 NewClassTy = NewPT->getPointeeType(); 2772 OldClassTy = OldPT->getPointeeType(); 2773 } 2774 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 2775 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 2776 NewClassTy = NewRT->getPointeeType(); 2777 OldClassTy = OldRT->getPointeeType(); 2778 } 2779 } 2780 2781 // The return types aren't either both pointers or references to a class type. 2782 if (NewClassTy.isNull()) { 2783 Diag(New->getLocation(), 2784 diag::err_different_return_type_for_overriding_virtual_function) 2785 << New->getDeclName() << NewTy << OldTy; 2786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2787 2788 return true; 2789 } 2790 2791 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 2792 // Check if the new class derives from the old class. 2793 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 2794 Diag(New->getLocation(), 2795 diag::err_covariant_return_not_derived) 2796 << New->getDeclName() << NewTy << OldTy; 2797 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2798 return true; 2799 } 2800 2801 // Check if we the conversion from derived to base is valid. 2802 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 2803 diag::err_covariant_return_inaccessible_base, 2804 diag::err_covariant_return_ambiguous_derived_to_base_conv, 2805 // FIXME: Should this point to the return type? 2806 New->getLocation(), SourceRange(), New->getDeclName())) { 2807 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2808 return true; 2809 } 2810 } 2811 2812 // The qualifiers of the return types must be the same. 2813 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 2814 Diag(New->getLocation(), 2815 diag::err_covariant_return_type_different_qualifications) 2816 << New->getDeclName() << NewTy << OldTy; 2817 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2818 return true; 2819 }; 2820 2821 2822 // The new class type must have the same or less qualifiers as the old type. 2823 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 2824 Diag(New->getLocation(), 2825 diag::err_covariant_return_type_class_type_more_qualified) 2826 << New->getDeclName() << NewTy << OldTy; 2827 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2828 return true; 2829 }; 2830 2831 return false; 2832} 2833