SemaDeclCXX.cpp revision 193326
1193326Sed//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10193326Sed// This file implements semantic analysis for C++ declarations. 11193326Sed// 12193326Sed//===----------------------------------------------------------------------===// 13193326Sed 14193326Sed#include "Sema.h" 15193326Sed#include "SemaInherit.h" 16193326Sed#include "clang/AST/ASTConsumer.h" 17193326Sed#include "clang/AST/ASTContext.h" 18193326Sed#include "clang/AST/DeclVisitor.h" 19193326Sed#include "clang/AST/TypeOrdering.h" 20193326Sed#include "clang/AST/StmtVisitor.h" 21193326Sed#include "clang/Lex/Preprocessor.h" 22193326Sed#include "clang/Parse/DeclSpec.h" 23193326Sed#include "llvm/ADT/STLExtras.h" 24193326Sed#include "llvm/Support/Compiler.h" 25193326Sed#include <algorithm> // for std::equal 26193326Sed#include <map> 27193326Sed 28193326Sedusing namespace clang; 29193326Sed 30193326Sed//===----------------------------------------------------------------------===// 31193326Sed// CheckDefaultArgumentVisitor 32193326Sed//===----------------------------------------------------------------------===// 33193326Sed 34193326Sednamespace { 35193326Sed /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36193326Sed /// the default argument of a parameter to determine whether it 37193326Sed /// contains any ill-formed subexpressions. For example, this will 38193326Sed /// diagnose the use of local variables or parameters within the 39193326Sed /// default argument expression. 40193326Sed class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41193326Sed : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42193326Sed Expr *DefaultArg; 43193326Sed Sema *S; 44193326Sed 45193326Sed public: 46193326Sed CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47193326Sed : DefaultArg(defarg), S(s) {} 48193326Sed 49193326Sed bool VisitExpr(Expr *Node); 50193326Sed bool VisitDeclRefExpr(DeclRefExpr *DRE); 51193326Sed bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52193326Sed }; 53193326Sed 54193326Sed /// VisitExpr - Visit all of the children of this expression. 55193326Sed bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56193326Sed bool IsInvalid = false; 57193326Sed for (Stmt::child_iterator I = Node->child_begin(), 58193326Sed E = Node->child_end(); I != E; ++I) 59193326Sed IsInvalid |= Visit(*I); 60193326Sed return IsInvalid; 61193326Sed } 62193326Sed 63193326Sed /// VisitDeclRefExpr - Visit a reference to a declaration, to 64193326Sed /// determine whether this declaration can be used in the default 65193326Sed /// argument expression. 66193326Sed bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67193326Sed NamedDecl *Decl = DRE->getDecl(); 68193326Sed if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69193326Sed // C++ [dcl.fct.default]p9 70193326Sed // Default arguments are evaluated each time the function is 71193326Sed // called. The order of evaluation of function arguments is 72193326Sed // unspecified. Consequently, parameters of a function shall not 73193326Sed // be used in default argument expressions, even if they are not 74193326Sed // evaluated. Parameters of a function declared before a default 75193326Sed // argument expression are in scope and can hide namespace and 76193326Sed // class member names. 77193326Sed return S->Diag(DRE->getSourceRange().getBegin(), 78193326Sed diag::err_param_default_argument_references_param) 79193326Sed << Param->getDeclName() << DefaultArg->getSourceRange(); 80193326Sed } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81193326Sed // C++ [dcl.fct.default]p7 82193326Sed // Local variables shall not be used in default argument 83193326Sed // expressions. 84193326Sed if (VDecl->isBlockVarDecl()) 85193326Sed return S->Diag(DRE->getSourceRange().getBegin(), 86193326Sed diag::err_param_default_argument_references_local) 87193326Sed << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88193326Sed } 89193326Sed 90193326Sed return false; 91193326Sed } 92193326Sed 93193326Sed /// VisitCXXThisExpr - Visit a C++ "this" expression. 94193326Sed bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95193326Sed // C++ [dcl.fct.default]p8: 96193326Sed // The keyword this shall not be used in a default argument of a 97193326Sed // member function. 98193326Sed return S->Diag(ThisE->getSourceRange().getBegin(), 99193326Sed diag::err_param_default_argument_references_this) 100193326Sed << ThisE->getSourceRange(); 101193326Sed } 102193326Sed} 103193326Sed 104193326Sed/// ActOnParamDefaultArgument - Check whether the default argument 105193326Sed/// provided for a function parameter is well-formed. If so, attach it 106193326Sed/// to the parameter declaration. 107193326Sedvoid 108193326SedSema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109193326Sed ExprArg defarg) { 110193326Sed ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 111193326Sed ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 112193326Sed QualType ParamType = Param->getType(); 113193326Sed 114193326Sed // Default arguments are only permitted in C++ 115193326Sed if (!getLangOptions().CPlusPlus) { 116193326Sed Diag(EqualLoc, diag::err_param_default_argument) 117193326Sed << DefaultArg->getSourceRange(); 118193326Sed Param->setInvalidDecl(); 119193326Sed return; 120193326Sed } 121193326Sed 122193326Sed // C++ [dcl.fct.default]p5 123193326Sed // A default argument expression is implicitly converted (clause 124193326Sed // 4) to the parameter type. The default argument expression has 125193326Sed // the same semantic constraints as the initializer expression in 126193326Sed // a declaration of a variable of the parameter type, using the 127193326Sed // copy-initialization semantics (8.5). 128193326Sed Expr *DefaultArgPtr = DefaultArg.get(); 129193326Sed bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130193326Sed EqualLoc, 131193326Sed Param->getDeclName(), 132193326Sed /*DirectInit=*/false); 133193326Sed if (DefaultArgPtr != DefaultArg.get()) { 134193326Sed DefaultArg.take(); 135193326Sed DefaultArg.reset(DefaultArgPtr); 136193326Sed } 137193326Sed if (DefaultInitFailed) { 138193326Sed return; 139193326Sed } 140193326Sed 141193326Sed // Check that the default argument is well-formed 142193326Sed CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143193326Sed if (DefaultArgChecker.Visit(DefaultArg.get())) { 144193326Sed Param->setInvalidDecl(); 145193326Sed return; 146193326Sed } 147193326Sed 148193326Sed // Okay: add the default argument to the parameter 149193326Sed Param->setDefaultArg(DefaultArg.take()); 150193326Sed} 151193326Sed 152193326Sed/// ActOnParamUnparsedDefaultArgument - We've seen a default 153193326Sed/// argument for a function parameter, but we can't parse it yet 154193326Sed/// because we're inside a class definition. Note that this default 155193326Sed/// argument will be parsed later. 156193326Sedvoid Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 157193326Sed SourceLocation EqualLoc) { 158193326Sed ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 159193326Sed if (Param) 160193326Sed Param->setUnparsedDefaultArg(); 161193326Sed} 162193326Sed 163193326Sed/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164193326Sed/// the default argument for the parameter param failed. 165193326Sedvoid Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 166193326Sed cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); 167193326Sed} 168193326Sed 169193326Sed/// CheckExtraCXXDefaultArguments - Check for any extra default 170193326Sed/// arguments in the declarator, which is not a function declaration 171193326Sed/// or definition and therefore is not permitted to have default 172193326Sed/// arguments. This routine should be invoked for every declarator 173193326Sed/// that is not a function declaration or definition. 174193326Sedvoid Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175193326Sed // C++ [dcl.fct.default]p3 176193326Sed // A default argument expression shall be specified only in the 177193326Sed // parameter-declaration-clause of a function declaration or in a 178193326Sed // template-parameter (14.1). It shall not be specified for a 179193326Sed // parameter pack. If it is specified in a 180193326Sed // parameter-declaration-clause, it shall not occur within a 181193326Sed // declarator or abstract-declarator of a parameter-declaration. 182193326Sed for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 183193326Sed DeclaratorChunk &chunk = D.getTypeObject(i); 184193326Sed if (chunk.Kind == DeclaratorChunk::Function) { 185193326Sed for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 186193326Sed ParmVarDecl *Param = 187193326Sed cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 188193326Sed if (Param->hasUnparsedDefaultArg()) { 189193326Sed CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 190193326Sed Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 191193326Sed << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 192193326Sed delete Toks; 193193326Sed chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 194193326Sed } else if (Param->getDefaultArg()) { 195193326Sed Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 196193326Sed << Param->getDefaultArg()->getSourceRange(); 197193326Sed Param->setDefaultArg(0); 198193326Sed } 199193326Sed } 200193326Sed } 201193326Sed } 202193326Sed} 203193326Sed 204193326Sed// MergeCXXFunctionDecl - Merge two declarations of the same C++ 205193326Sed// function, once we already know that they have the same 206193326Sed// type. Subroutine of MergeFunctionDecl. Returns true if there was an 207193326Sed// error, false otherwise. 208193326Sedbool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 209193326Sed bool Invalid = false; 210193326Sed 211193326Sed // C++ [dcl.fct.default]p4: 212193326Sed // 213193326Sed // For non-template functions, default arguments can be added in 214193326Sed // later declarations of a function in the same 215193326Sed // scope. Declarations in different scopes have completely 216193326Sed // distinct sets of default arguments. That is, declarations in 217193326Sed // inner scopes do not acquire default arguments from 218193326Sed // declarations in outer scopes, and vice versa. In a given 219193326Sed // function declaration, all parameters subsequent to a 220193326Sed // parameter with a default argument shall have default 221193326Sed // arguments supplied in this or previous declarations. A 222193326Sed // default argument shall not be redefined by a later 223193326Sed // declaration (not even to the same value). 224193326Sed for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 225193326Sed ParmVarDecl *OldParam = Old->getParamDecl(p); 226193326Sed ParmVarDecl *NewParam = New->getParamDecl(p); 227193326Sed 228193326Sed if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 229193326Sed Diag(NewParam->getLocation(), 230193326Sed diag::err_param_default_argument_redefinition) 231193326Sed << NewParam->getDefaultArg()->getSourceRange(); 232193326Sed Diag(OldParam->getLocation(), diag::note_previous_definition); 233193326Sed Invalid = true; 234193326Sed } else if (OldParam->getDefaultArg()) { 235193326Sed // Merge the old default argument into the new parameter 236193326Sed NewParam->setDefaultArg(OldParam->getDefaultArg()); 237193326Sed } 238193326Sed } 239193326Sed 240193326Sed return Invalid; 241193326Sed} 242193326Sed 243193326Sed/// CheckCXXDefaultArguments - Verify that the default arguments for a 244193326Sed/// function declaration are well-formed according to C++ 245193326Sed/// [dcl.fct.default]. 246193326Sedvoid Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 247193326Sed unsigned NumParams = FD->getNumParams(); 248193326Sed unsigned p; 249193326Sed 250193326Sed // Find first parameter with a default argument 251193326Sed for (p = 0; p < NumParams; ++p) { 252193326Sed ParmVarDecl *Param = FD->getParamDecl(p); 253193326Sed if (Param->getDefaultArg()) 254193326Sed break; 255193326Sed } 256193326Sed 257193326Sed // C++ [dcl.fct.default]p4: 258193326Sed // In a given function declaration, all parameters 259193326Sed // subsequent to a parameter with a default argument shall 260193326Sed // have default arguments supplied in this or previous 261193326Sed // declarations. A default argument shall not be redefined 262193326Sed // by a later declaration (not even to the same value). 263193326Sed unsigned LastMissingDefaultArg = 0; 264193326Sed for(; p < NumParams; ++p) { 265193326Sed ParmVarDecl *Param = FD->getParamDecl(p); 266193326Sed if (!Param->getDefaultArg()) { 267193326Sed if (Param->isInvalidDecl()) 268193326Sed /* We already complained about this parameter. */; 269193326Sed else if (Param->getIdentifier()) 270193326Sed Diag(Param->getLocation(), 271193326Sed diag::err_param_default_argument_missing_name) 272193326Sed << Param->getIdentifier(); 273193326Sed else 274193326Sed Diag(Param->getLocation(), 275193326Sed diag::err_param_default_argument_missing); 276193326Sed 277193326Sed LastMissingDefaultArg = p; 278193326Sed } 279193326Sed } 280193326Sed 281193326Sed if (LastMissingDefaultArg > 0) { 282193326Sed // Some default arguments were missing. Clear out all of the 283193326Sed // default arguments up to (and including) the last missing 284193326Sed // default argument, so that we leave the function parameters 285193326Sed // in a semantically valid state. 286193326Sed for (p = 0; p <= LastMissingDefaultArg; ++p) { 287193326Sed ParmVarDecl *Param = FD->getParamDecl(p); 288193326Sed if (Param->getDefaultArg()) { 289193326Sed if (!Param->hasUnparsedDefaultArg()) 290193326Sed Param->getDefaultArg()->Destroy(Context); 291193326Sed Param->setDefaultArg(0); 292193326Sed } 293193326Sed } 294193326Sed } 295193326Sed} 296193326Sed 297193326Sed/// isCurrentClassName - Determine whether the identifier II is the 298193326Sed/// name of the class type currently being defined. In the case of 299193326Sed/// nested classes, this will only return true if II is the name of 300193326Sed/// the innermost class. 301193326Sedbool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 302193326Sed const CXXScopeSpec *SS) { 303193326Sed CXXRecordDecl *CurDecl; 304193326Sed if (SS && SS->isSet() && !SS->isInvalid()) { 305193326Sed DeclContext *DC = computeDeclContext(*SS); 306193326Sed CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 307193326Sed } else 308193326Sed CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 309193326Sed 310193326Sed if (CurDecl) 311193326Sed return &II == CurDecl->getIdentifier(); 312193326Sed else 313193326Sed return false; 314193326Sed} 315193326Sed 316193326Sed/// \brief Check the validity of a C++ base class specifier. 317193326Sed/// 318193326Sed/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 319193326Sed/// and returns NULL otherwise. 320193326SedCXXBaseSpecifier * 321193326SedSema::CheckBaseSpecifier(CXXRecordDecl *Class, 322193326Sed SourceRange SpecifierRange, 323193326Sed bool Virtual, AccessSpecifier Access, 324193326Sed QualType BaseType, 325193326Sed SourceLocation BaseLoc) { 326193326Sed // C++ [class.union]p1: 327193326Sed // A union shall not have base classes. 328193326Sed if (Class->isUnion()) { 329193326Sed Diag(Class->getLocation(), diag::err_base_clause_on_union) 330193326Sed << SpecifierRange; 331193326Sed return 0; 332193326Sed } 333193326Sed 334193326Sed if (BaseType->isDependentType()) 335193326Sed return new CXXBaseSpecifier(SpecifierRange, Virtual, 336193326Sed Class->getTagKind() == RecordDecl::TK_class, 337193326Sed Access, BaseType); 338193326Sed 339193326Sed // Base specifiers must be record types. 340193326Sed if (!BaseType->isRecordType()) { 341193326Sed Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 342193326Sed return 0; 343193326Sed } 344193326Sed 345193326Sed // C++ [class.union]p1: 346193326Sed // A union shall not be used as a base class. 347193326Sed if (BaseType->isUnionType()) { 348193326Sed Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 349193326Sed return 0; 350193326Sed } 351193326Sed 352193326Sed // C++ [class.derived]p2: 353193326Sed // The class-name in a base-specifier shall not be an incompletely 354193326Sed // defined class. 355193326Sed if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 356193326Sed SpecifierRange)) 357193326Sed return 0; 358193326Sed 359193326Sed // If the base class is polymorphic, the new one is, too. 360193326Sed RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 361193326Sed assert(BaseDecl && "Record type has no declaration"); 362193326Sed BaseDecl = BaseDecl->getDefinition(Context); 363193326Sed assert(BaseDecl && "Base type is not incomplete, but has no definition"); 364193326Sed if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 365193326Sed Class->setPolymorphic(true); 366193326Sed 367193326Sed // C++ [dcl.init.aggr]p1: 368193326Sed // An aggregate is [...] a class with [...] no base classes [...]. 369193326Sed Class->setAggregate(false); 370193326Sed Class->setPOD(false); 371193326Sed 372193326Sed if (Virtual) { 373193326Sed // C++ [class.ctor]p5: 374193326Sed // A constructor is trivial if its class has no virtual base classes. 375193326Sed Class->setHasTrivialConstructor(false); 376193326Sed } else { 377193326Sed // C++ [class.ctor]p5: 378193326Sed // A constructor is trivial if all the direct base classes of its 379193326Sed // class have trivial constructors. 380193326Sed Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 381193326Sed hasTrivialConstructor()); 382193326Sed } 383193326Sed 384193326Sed // C++ [class.ctor]p3: 385193326Sed // A destructor is trivial if all the direct base classes of its class 386193326Sed // have trivial destructors. 387193326Sed Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 388193326Sed hasTrivialDestructor()); 389193326Sed 390193326Sed // Create the base specifier. 391193326Sed // FIXME: Allocate via ASTContext? 392193326Sed return new CXXBaseSpecifier(SpecifierRange, Virtual, 393193326Sed Class->getTagKind() == RecordDecl::TK_class, 394193326Sed Access, BaseType); 395193326Sed} 396193326Sed 397193326Sed/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 398193326Sed/// one entry in the base class list of a class specifier, for 399193326Sed/// example: 400193326Sed/// class foo : public bar, virtual private baz { 401193326Sed/// 'public bar' and 'virtual private baz' are each base-specifiers. 402193326SedSema::BaseResult 403193326SedSema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 404193326Sed bool Virtual, AccessSpecifier Access, 405193326Sed TypeTy *basetype, SourceLocation BaseLoc) { 406193326Sed AdjustDeclIfTemplate(classdecl); 407193326Sed CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 408193326Sed QualType BaseType = QualType::getFromOpaquePtr(basetype); 409193326Sed if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 410193326Sed Virtual, Access, 411193326Sed BaseType, BaseLoc)) 412193326Sed return BaseSpec; 413193326Sed 414193326Sed return true; 415193326Sed} 416193326Sed 417193326Sed/// \brief Performs the actual work of attaching the given base class 418193326Sed/// specifiers to a C++ class. 419193326Sedbool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 420193326Sed unsigned NumBases) { 421193326Sed if (NumBases == 0) 422193326Sed return false; 423193326Sed 424193326Sed // Used to keep track of which base types we have already seen, so 425193326Sed // that we can properly diagnose redundant direct base types. Note 426193326Sed // that the key is always the unqualified canonical type of the base 427193326Sed // class. 428193326Sed std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 429193326Sed 430193326Sed // Copy non-redundant base specifiers into permanent storage. 431193326Sed unsigned NumGoodBases = 0; 432193326Sed bool Invalid = false; 433193326Sed for (unsigned idx = 0; idx < NumBases; ++idx) { 434193326Sed QualType NewBaseType 435193326Sed = Context.getCanonicalType(Bases[idx]->getType()); 436193326Sed NewBaseType = NewBaseType.getUnqualifiedType(); 437193326Sed 438193326Sed if (KnownBaseTypes[NewBaseType]) { 439193326Sed // C++ [class.mi]p3: 440193326Sed // A class shall not be specified as a direct base class of a 441193326Sed // derived class more than once. 442193326Sed Diag(Bases[idx]->getSourceRange().getBegin(), 443193326Sed diag::err_duplicate_base_class) 444193326Sed << KnownBaseTypes[NewBaseType]->getType() 445193326Sed << Bases[idx]->getSourceRange(); 446193326Sed 447193326Sed // Delete the duplicate base class specifier; we're going to 448193326Sed // overwrite its pointer later. 449193326Sed delete Bases[idx]; 450193326Sed 451193326Sed Invalid = true; 452193326Sed } else { 453193326Sed // Okay, add this new base class. 454193326Sed KnownBaseTypes[NewBaseType] = Bases[idx]; 455193326Sed Bases[NumGoodBases++] = Bases[idx]; 456193326Sed } 457193326Sed } 458193326Sed 459193326Sed // Attach the remaining base class specifiers to the derived class. 460193326Sed Class->setBases(Bases, NumGoodBases); 461193326Sed 462193326Sed // Delete the remaining (good) base class specifiers, since their 463193326Sed // data has been copied into the CXXRecordDecl. 464193326Sed for (unsigned idx = 0; idx < NumGoodBases; ++idx) 465193326Sed delete Bases[idx]; 466193326Sed 467193326Sed return Invalid; 468193326Sed} 469193326Sed 470193326Sed/// ActOnBaseSpecifiers - Attach the given base specifiers to the 471193326Sed/// class, after checking whether there are any duplicate base 472193326Sed/// classes. 473193326Sedvoid Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 474193326Sed unsigned NumBases) { 475193326Sed if (!ClassDecl || !Bases || !NumBases) 476193326Sed return; 477193326Sed 478193326Sed AdjustDeclIfTemplate(ClassDecl); 479193326Sed AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 480193326Sed (CXXBaseSpecifier**)(Bases), NumBases); 481193326Sed} 482193326Sed 483193326Sed//===----------------------------------------------------------------------===// 484193326Sed// C++ class member Handling 485193326Sed//===----------------------------------------------------------------------===// 486193326Sed 487193326Sed/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 488193326Sed/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 489193326Sed/// bitfield width if there is one and 'InitExpr' specifies the initializer if 490193326Sed/// any. 491193326SedSema::DeclPtrTy 492193326SedSema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 493193326Sed ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 494193326Sed const DeclSpec &DS = D.getDeclSpec(); 495193326Sed DeclarationName Name = GetNameForDeclarator(D); 496193326Sed Expr *BitWidth = static_cast<Expr*>(BW); 497193326Sed Expr *Init = static_cast<Expr*>(InitExpr); 498193326Sed SourceLocation Loc = D.getIdentifierLoc(); 499193326Sed 500193326Sed bool isFunc = D.isFunctionDeclarator(); 501193326Sed 502193326Sed // C++ 9.2p6: A member shall not be declared to have automatic storage 503193326Sed // duration (auto, register) or with the extern storage-class-specifier. 504193326Sed // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 505193326Sed // data members and cannot be applied to names declared const or static, 506193326Sed // and cannot be applied to reference members. 507193326Sed switch (DS.getStorageClassSpec()) { 508193326Sed case DeclSpec::SCS_unspecified: 509193326Sed case DeclSpec::SCS_typedef: 510193326Sed case DeclSpec::SCS_static: 511193326Sed // FALL THROUGH. 512193326Sed break; 513193326Sed case DeclSpec::SCS_mutable: 514193326Sed if (isFunc) { 515193326Sed if (DS.getStorageClassSpecLoc().isValid()) 516193326Sed Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 517193326Sed else 518193326Sed Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 519193326Sed 520193326Sed // FIXME: It would be nicer if the keyword was ignored only for this 521193326Sed // declarator. Otherwise we could get follow-up errors. 522193326Sed D.getMutableDeclSpec().ClearStorageClassSpecs(); 523193326Sed } else { 524193326Sed QualType T = GetTypeForDeclarator(D, S); 525193326Sed diag::kind err = static_cast<diag::kind>(0); 526193326Sed if (T->isReferenceType()) 527193326Sed err = diag::err_mutable_reference; 528193326Sed else if (T.isConstQualified()) 529193326Sed err = diag::err_mutable_const; 530193326Sed if (err != 0) { 531193326Sed if (DS.getStorageClassSpecLoc().isValid()) 532193326Sed Diag(DS.getStorageClassSpecLoc(), err); 533193326Sed else 534193326Sed Diag(DS.getThreadSpecLoc(), err); 535193326Sed // FIXME: It would be nicer if the keyword was ignored only for this 536193326Sed // declarator. Otherwise we could get follow-up errors. 537193326Sed D.getMutableDeclSpec().ClearStorageClassSpecs(); 538193326Sed } 539193326Sed } 540193326Sed break; 541193326Sed default: 542193326Sed if (DS.getStorageClassSpecLoc().isValid()) 543193326Sed Diag(DS.getStorageClassSpecLoc(), 544193326Sed diag::err_storageclass_invalid_for_member); 545193326Sed else 546193326Sed Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 547193326Sed D.getMutableDeclSpec().ClearStorageClassSpecs(); 548193326Sed } 549193326Sed 550193326Sed if (!isFunc && 551193326Sed D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 552193326Sed D.getNumTypeObjects() == 0) { 553193326Sed // Check also for this case: 554193326Sed // 555193326Sed // typedef int f(); 556193326Sed // f a; 557193326Sed // 558193326Sed QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 559193326Sed isFunc = TDType->isFunctionType(); 560193326Sed } 561193326Sed 562193326Sed bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 563193326Sed DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 564193326Sed !isFunc); 565193326Sed 566193326Sed Decl *Member; 567193326Sed if (isInstField) { 568193326Sed Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 569193326Sed AS); 570193326Sed assert(Member && "HandleField never returns null"); 571193326Sed } else { 572193326Sed Member = ActOnDeclarator(S, D).getAs<Decl>(); 573193326Sed if (!Member) { 574193326Sed if (BitWidth) DeleteExpr(BitWidth); 575193326Sed return DeclPtrTy(); 576193326Sed } 577193326Sed 578193326Sed // Non-instance-fields can't have a bitfield. 579193326Sed if (BitWidth) { 580193326Sed if (Member->isInvalidDecl()) { 581193326Sed // don't emit another diagnostic. 582193326Sed } else if (isa<VarDecl>(Member)) { 583193326Sed // C++ 9.6p3: A bit-field shall not be a static member. 584193326Sed // "static member 'A' cannot be a bit-field" 585193326Sed Diag(Loc, diag::err_static_not_bitfield) 586193326Sed << Name << BitWidth->getSourceRange(); 587193326Sed } else if (isa<TypedefDecl>(Member)) { 588193326Sed // "typedef member 'x' cannot be a bit-field" 589193326Sed Diag(Loc, diag::err_typedef_not_bitfield) 590193326Sed << Name << BitWidth->getSourceRange(); 591193326Sed } else { 592193326Sed // A function typedef ("typedef int f(); f a;"). 593193326Sed // C++ 9.6p3: A bit-field shall have integral or enumeration type. 594193326Sed Diag(Loc, diag::err_not_integral_type_bitfield) 595193326Sed << Name << cast<ValueDecl>(Member)->getType() 596193326Sed << BitWidth->getSourceRange(); 597193326Sed } 598193326Sed 599193326Sed DeleteExpr(BitWidth); 600193326Sed BitWidth = 0; 601193326Sed Member->setInvalidDecl(); 602193326Sed } 603193326Sed 604193326Sed Member->setAccess(AS); 605193326Sed } 606193326Sed 607193326Sed assert((Name || isInstField) && "No identifier for non-field ?"); 608193326Sed 609193326Sed if (Init) 610193326Sed AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 611193326Sed if (Deleted) // FIXME: Source location is not very good. 612193326Sed SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 613193326Sed 614193326Sed if (isInstField) { 615193326Sed FieldCollector->Add(cast<FieldDecl>(Member)); 616193326Sed return DeclPtrTy(); 617193326Sed } 618193326Sed return DeclPtrTy::make(Member); 619193326Sed} 620193326Sed 621193326Sed/// ActOnMemInitializer - Handle a C++ member initializer. 622193326SedSema::MemInitResult 623193326SedSema::ActOnMemInitializer(DeclPtrTy ConstructorD, 624193326Sed Scope *S, 625193326Sed IdentifierInfo *MemberOrBase, 626193326Sed SourceLocation IdLoc, 627193326Sed SourceLocation LParenLoc, 628193326Sed ExprTy **Args, unsigned NumArgs, 629193326Sed SourceLocation *CommaLocs, 630193326Sed SourceLocation RParenLoc) { 631193326Sed CXXConstructorDecl *Constructor 632193326Sed = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 633193326Sed if (!Constructor) { 634193326Sed // The user wrote a constructor initializer on a function that is 635193326Sed // not a C++ constructor. Ignore the error for now, because we may 636193326Sed // have more member initializers coming; we'll diagnose it just 637193326Sed // once in ActOnMemInitializers. 638193326Sed return true; 639193326Sed } 640193326Sed 641193326Sed CXXRecordDecl *ClassDecl = Constructor->getParent(); 642193326Sed 643193326Sed // C++ [class.base.init]p2: 644193326Sed // Names in a mem-initializer-id are looked up in the scope of the 645193326Sed // constructor���s class and, if not found in that scope, are looked 646193326Sed // up in the scope containing the constructor���s 647193326Sed // definition. [Note: if the constructor���s class contains a member 648193326Sed // with the same name as a direct or virtual base class of the 649193326Sed // class, a mem-initializer-id naming the member or base class and 650193326Sed // composed of a single identifier refers to the class member. A 651193326Sed // mem-initializer-id for the hidden base class may be specified 652193326Sed // using a qualified name. ] 653193326Sed // Look for a member, first. 654193326Sed FieldDecl *Member = 0; 655193326Sed DeclContext::lookup_result Result 656193326Sed = ClassDecl->lookup(Context, MemberOrBase); 657193326Sed if (Result.first != Result.second) 658193326Sed Member = dyn_cast<FieldDecl>(*Result.first); 659193326Sed 660193326Sed // FIXME: Handle members of an anonymous union. 661193326Sed 662193326Sed if (Member) { 663193326Sed // FIXME: Perform direct initialization of the member. 664193326Sed return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 665193326Sed } 666193326Sed 667193326Sed // It didn't name a member, so see if it names a class. 668193326Sed TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 669193326Sed if (!BaseTy) 670193326Sed return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 671193326Sed << MemberOrBase << SourceRange(IdLoc, RParenLoc); 672193326Sed 673193326Sed QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 674193326Sed if (!BaseType->isRecordType()) 675193326Sed return Diag(IdLoc, diag::err_base_init_does_not_name_class) 676193326Sed << BaseType << SourceRange(IdLoc, RParenLoc); 677193326Sed 678193326Sed // C++ [class.base.init]p2: 679193326Sed // [...] Unless the mem-initializer-id names a nonstatic data 680193326Sed // member of the constructor���s class or a direct or virtual base 681193326Sed // of that class, the mem-initializer is ill-formed. A 682193326Sed // mem-initializer-list can initialize a base class using any 683193326Sed // name that denotes that base class type. 684193326Sed 685193326Sed // First, check for a direct base class. 686193326Sed const CXXBaseSpecifier *DirectBaseSpec = 0; 687193326Sed for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 688193326Sed Base != ClassDecl->bases_end(); ++Base) { 689193326Sed if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 690193326Sed Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 691193326Sed // We found a direct base of this type. That's what we're 692193326Sed // initializing. 693193326Sed DirectBaseSpec = &*Base; 694193326Sed break; 695193326Sed } 696193326Sed } 697193326Sed 698193326Sed // Check for a virtual base class. 699193326Sed // FIXME: We might be able to short-circuit this if we know in advance that 700193326Sed // there are no virtual bases. 701193326Sed const CXXBaseSpecifier *VirtualBaseSpec = 0; 702193326Sed if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 703193326Sed // We haven't found a base yet; search the class hierarchy for a 704193326Sed // virtual base class. 705193326Sed BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 706193326Sed /*DetectVirtual=*/false); 707193326Sed if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 708193326Sed for (BasePaths::paths_iterator Path = Paths.begin(); 709193326Sed Path != Paths.end(); ++Path) { 710193326Sed if (Path->back().Base->isVirtual()) { 711193326Sed VirtualBaseSpec = Path->back().Base; 712193326Sed break; 713193326Sed } 714193326Sed } 715193326Sed } 716193326Sed } 717193326Sed 718193326Sed // C++ [base.class.init]p2: 719193326Sed // If a mem-initializer-id is ambiguous because it designates both 720193326Sed // a direct non-virtual base class and an inherited virtual base 721193326Sed // class, the mem-initializer is ill-formed. 722193326Sed if (DirectBaseSpec && VirtualBaseSpec) 723193326Sed return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 724193326Sed << MemberOrBase << SourceRange(IdLoc, RParenLoc); 725193326Sed 726193326Sed return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 727193326Sed} 728193326Sed 729193326Sedvoid Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 730193326Sed SourceLocation ColonLoc, 731193326Sed MemInitTy **MemInits, unsigned NumMemInits) { 732193326Sed CXXConstructorDecl *Constructor = 733193326Sed dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 734193326Sed 735193326Sed if (!Constructor) { 736193326Sed Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 737193326Sed return; 738193326Sed } 739193326Sed} 740193326Sed 741193326Sednamespace { 742193326Sed /// PureVirtualMethodCollector - traverses a class and its superclasses 743193326Sed /// and determines if it has any pure virtual methods. 744193326Sed class VISIBILITY_HIDDEN PureVirtualMethodCollector { 745193326Sed ASTContext &Context; 746193326Sed 747193326Sed public: 748193326Sed typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 749193326Sed 750193326Sed private: 751193326Sed MethodList Methods; 752193326Sed 753193326Sed void Collect(const CXXRecordDecl* RD, MethodList& Methods); 754193326Sed 755193326Sed public: 756193326Sed PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 757193326Sed : Context(Ctx) { 758193326Sed 759193326Sed MethodList List; 760193326Sed Collect(RD, List); 761193326Sed 762193326Sed // Copy the temporary list to methods, and make sure to ignore any 763193326Sed // null entries. 764193326Sed for (size_t i = 0, e = List.size(); i != e; ++i) { 765193326Sed if (List[i]) 766193326Sed Methods.push_back(List[i]); 767193326Sed } 768193326Sed } 769193326Sed 770193326Sed bool empty() const { return Methods.empty(); } 771193326Sed 772193326Sed MethodList::const_iterator methods_begin() { return Methods.begin(); } 773193326Sed MethodList::const_iterator methods_end() { return Methods.end(); } 774193326Sed }; 775193326Sed 776193326Sed void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 777193326Sed MethodList& Methods) { 778193326Sed // First, collect the pure virtual methods for the base classes. 779193326Sed for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 780193326Sed BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 781193326Sed if (const RecordType *RT = Base->getType()->getAsRecordType()) { 782193326Sed const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 783193326Sed if (BaseDecl && BaseDecl->isAbstract()) 784193326Sed Collect(BaseDecl, Methods); 785193326Sed } 786193326Sed } 787193326Sed 788193326Sed // Next, zero out any pure virtual methods that this class overrides. 789193326Sed typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 790193326Sed 791193326Sed MethodSetTy OverriddenMethods; 792193326Sed size_t MethodsSize = Methods.size(); 793193326Sed 794193326Sed for (RecordDecl::decl_iterator i = RD->decls_begin(Context), 795193326Sed e = RD->decls_end(Context); 796193326Sed i != e; ++i) { 797193326Sed // Traverse the record, looking for methods. 798193326Sed if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 799193326Sed // If the method is pre virtual, add it to the methods vector. 800193326Sed if (MD->isPure()) { 801193326Sed Methods.push_back(MD); 802193326Sed continue; 803193326Sed } 804193326Sed 805193326Sed // Otherwise, record all the overridden methods in our set. 806193326Sed for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 807193326Sed E = MD->end_overridden_methods(); I != E; ++I) { 808193326Sed // Keep track of the overridden methods. 809193326Sed OverriddenMethods.insert(*I); 810193326Sed } 811193326Sed } 812193326Sed } 813193326Sed 814193326Sed // Now go through the methods and zero out all the ones we know are 815193326Sed // overridden. 816193326Sed for (size_t i = 0, e = MethodsSize; i != e; ++i) { 817193326Sed if (OverriddenMethods.count(Methods[i])) 818193326Sed Methods[i] = 0; 819193326Sed } 820193326Sed 821193326Sed } 822193326Sed} 823193326Sed 824193326Sedbool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 825193326Sed unsigned DiagID, AbstractDiagSelID SelID, 826193326Sed const CXXRecordDecl *CurrentRD) { 827193326Sed 828193326Sed if (!getLangOptions().CPlusPlus) 829193326Sed return false; 830193326Sed 831193326Sed if (const ArrayType *AT = Context.getAsArrayType(T)) 832193326Sed return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 833193326Sed CurrentRD); 834193326Sed 835193326Sed if (const PointerType *PT = T->getAsPointerType()) { 836193326Sed // Find the innermost pointer type. 837193326Sed while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 838193326Sed PT = T; 839193326Sed 840193326Sed if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 841193326Sed return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 842193326Sed CurrentRD); 843193326Sed } 844193326Sed 845193326Sed const RecordType *RT = T->getAsRecordType(); 846193326Sed if (!RT) 847193326Sed return false; 848193326Sed 849193326Sed const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 850193326Sed if (!RD) 851193326Sed return false; 852193326Sed 853193326Sed if (CurrentRD && CurrentRD != RD) 854193326Sed return false; 855193326Sed 856193326Sed if (!RD->isAbstract()) 857193326Sed return false; 858193326Sed 859193326Sed Diag(Loc, DiagID) << RD->getDeclName() << SelID; 860193326Sed 861193326Sed // Check if we've already emitted the list of pure virtual functions for this 862193326Sed // class. 863193326Sed if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 864193326Sed return true; 865193326Sed 866193326Sed PureVirtualMethodCollector Collector(Context, RD); 867193326Sed 868193326Sed for (PureVirtualMethodCollector::MethodList::const_iterator I = 869193326Sed Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 870193326Sed const CXXMethodDecl *MD = *I; 871193326Sed 872193326Sed Diag(MD->getLocation(), diag::note_pure_virtual_function) << 873193326Sed MD->getDeclName(); 874193326Sed } 875193326Sed 876193326Sed if (!PureVirtualClassDiagSet) 877193326Sed PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 878193326Sed PureVirtualClassDiagSet->insert(RD); 879193326Sed 880193326Sed return true; 881193326Sed} 882193326Sed 883193326Sednamespace { 884193326Sed class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 885193326Sed : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 886193326Sed Sema &SemaRef; 887193326Sed CXXRecordDecl *AbstractClass; 888193326Sed 889193326Sed bool VisitDeclContext(const DeclContext *DC) { 890193326Sed bool Invalid = false; 891193326Sed 892193326Sed for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), 893193326Sed E = DC->decls_end(SemaRef.Context); I != E; ++I) 894193326Sed Invalid |= Visit(*I); 895193326Sed 896193326Sed return Invalid; 897193326Sed } 898193326Sed 899193326Sed public: 900193326Sed AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 901193326Sed : SemaRef(SemaRef), AbstractClass(ac) { 902193326Sed Visit(SemaRef.Context.getTranslationUnitDecl()); 903193326Sed } 904193326Sed 905193326Sed bool VisitFunctionDecl(const FunctionDecl *FD) { 906193326Sed if (FD->isThisDeclarationADefinition()) { 907193326Sed // No need to do the check if we're in a definition, because it requires 908193326Sed // that the return/param types are complete. 909193326Sed // because that requires 910193326Sed return VisitDeclContext(FD); 911193326Sed } 912193326Sed 913193326Sed // Check the return type. 914193326Sed QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 915193326Sed bool Invalid = 916193326Sed SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 917193326Sed diag::err_abstract_type_in_decl, 918193326Sed Sema::AbstractReturnType, 919193326Sed AbstractClass); 920193326Sed 921193326Sed for (FunctionDecl::param_const_iterator I = FD->param_begin(), 922193326Sed E = FD->param_end(); I != E; ++I) { 923193326Sed const ParmVarDecl *VD = *I; 924193326Sed Invalid |= 925193326Sed SemaRef.RequireNonAbstractType(VD->getLocation(), 926193326Sed VD->getOriginalType(), 927193326Sed diag::err_abstract_type_in_decl, 928193326Sed Sema::AbstractParamType, 929193326Sed AbstractClass); 930193326Sed } 931193326Sed 932193326Sed return Invalid; 933193326Sed } 934193326Sed 935193326Sed bool VisitDecl(const Decl* D) { 936193326Sed if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 937193326Sed return VisitDeclContext(DC); 938193326Sed 939193326Sed return false; 940193326Sed } 941193326Sed }; 942193326Sed} 943193326Sed 944193326Sedvoid Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 945193326Sed DeclPtrTy TagDecl, 946193326Sed SourceLocation LBrac, 947193326Sed SourceLocation RBrac) { 948193326Sed AdjustDeclIfTemplate(TagDecl); 949193326Sed ActOnFields(S, RLoc, TagDecl, 950193326Sed (DeclPtrTy*)FieldCollector->getCurFields(), 951193326Sed FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 952193326Sed 953193326Sed CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 954193326Sed if (!RD->isAbstract()) { 955193326Sed // Collect all the pure virtual methods and see if this is an abstract 956193326Sed // class after all. 957193326Sed PureVirtualMethodCollector Collector(Context, RD); 958193326Sed if (!Collector.empty()) 959193326Sed RD->setAbstract(true); 960193326Sed } 961193326Sed 962193326Sed if (RD->isAbstract()) 963193326Sed AbstractClassUsageDiagnoser(*this, RD); 964193326Sed 965193326Sed if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 966193326Sed for (RecordDecl::field_iterator i = RD->field_begin(Context), 967193326Sed e = RD->field_end(Context); i != e; ++i) { 968193326Sed // All the nonstatic data members must have trivial constructors. 969193326Sed QualType FTy = i->getType(); 970193326Sed while (const ArrayType *AT = Context.getAsArrayType(FTy)) 971193326Sed FTy = AT->getElementType(); 972193326Sed 973193326Sed if (const RecordType *RT = FTy->getAsRecordType()) { 974193326Sed CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 975193326Sed 976193326Sed if (!FieldRD->hasTrivialConstructor()) 977193326Sed RD->setHasTrivialConstructor(false); 978193326Sed if (!FieldRD->hasTrivialDestructor()) 979193326Sed RD->setHasTrivialDestructor(false); 980193326Sed 981193326Sed // If RD has neither a trivial constructor nor a trivial destructor 982193326Sed // we don't need to continue checking. 983193326Sed if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 984193326Sed break; 985193326Sed } 986193326Sed } 987193326Sed } 988193326Sed 989193326Sed if (!RD->isDependentType()) 990193326Sed AddImplicitlyDeclaredMembersToClass(RD); 991193326Sed} 992193326Sed 993193326Sed/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 994193326Sed/// special functions, such as the default constructor, copy 995193326Sed/// constructor, or destructor, to the given C++ class (C++ 996193326Sed/// [special]p1). This routine can only be executed just before the 997193326Sed/// definition of the class is complete. 998193326Sedvoid Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 999193326Sed QualType ClassType = Context.getTypeDeclType(ClassDecl); 1000193326Sed ClassType = Context.getCanonicalType(ClassType); 1001193326Sed 1002193326Sed // FIXME: Implicit declarations have exception specifications, which are 1003193326Sed // the union of the specifications of the implicitly called functions. 1004193326Sed 1005193326Sed if (!ClassDecl->hasUserDeclaredConstructor()) { 1006193326Sed // C++ [class.ctor]p5: 1007193326Sed // A default constructor for a class X is a constructor of class X 1008193326Sed // that can be called without an argument. If there is no 1009193326Sed // user-declared constructor for class X, a default constructor is 1010193326Sed // implicitly declared. An implicitly-declared default constructor 1011193326Sed // is an inline public member of its class. 1012193326Sed DeclarationName Name 1013193326Sed = Context.DeclarationNames.getCXXConstructorName(ClassType); 1014193326Sed CXXConstructorDecl *DefaultCon = 1015193326Sed CXXConstructorDecl::Create(Context, ClassDecl, 1016193326Sed ClassDecl->getLocation(), Name, 1017193326Sed Context.getFunctionType(Context.VoidTy, 1018193326Sed 0, 0, false, 0), 1019193326Sed /*isExplicit=*/false, 1020193326Sed /*isInline=*/true, 1021193326Sed /*isImplicitlyDeclared=*/true); 1022193326Sed DefaultCon->setAccess(AS_public); 1023193326Sed DefaultCon->setImplicit(); 1024193326Sed ClassDecl->addDecl(Context, DefaultCon); 1025193326Sed 1026193326Sed // Notify the class that we've added a constructor. 1027193326Sed ClassDecl->addedConstructor(Context, DefaultCon); 1028193326Sed } 1029193326Sed 1030193326Sed if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1031193326Sed // C++ [class.copy]p4: 1032193326Sed // If the class definition does not explicitly declare a copy 1033193326Sed // constructor, one is declared implicitly. 1034193326Sed 1035193326Sed // C++ [class.copy]p5: 1036193326Sed // The implicitly-declared copy constructor for a class X will 1037193326Sed // have the form 1038193326Sed // 1039193326Sed // X::X(const X&) 1040193326Sed // 1041193326Sed // if 1042193326Sed bool HasConstCopyConstructor = true; 1043193326Sed 1044193326Sed // -- each direct or virtual base class B of X has a copy 1045193326Sed // constructor whose first parameter is of type const B& or 1046193326Sed // const volatile B&, and 1047193326Sed for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1048193326Sed HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1049193326Sed const CXXRecordDecl *BaseClassDecl 1050193326Sed = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1051193326Sed HasConstCopyConstructor 1052193326Sed = BaseClassDecl->hasConstCopyConstructor(Context); 1053193326Sed } 1054193326Sed 1055193326Sed // -- for all the nonstatic data members of X that are of a 1056193326Sed // class type M (or array thereof), each such class type 1057193326Sed // has a copy constructor whose first parameter is of type 1058193326Sed // const M& or const volatile M&. 1059193326Sed for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1060193326Sed HasConstCopyConstructor && Field != ClassDecl->field_end(Context); 1061193326Sed ++Field) { 1062193326Sed QualType FieldType = (*Field)->getType(); 1063193326Sed if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1064193326Sed FieldType = Array->getElementType(); 1065193326Sed if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1066193326Sed const CXXRecordDecl *FieldClassDecl 1067193326Sed = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1068193326Sed HasConstCopyConstructor 1069193326Sed = FieldClassDecl->hasConstCopyConstructor(Context); 1070193326Sed } 1071193326Sed } 1072193326Sed 1073193326Sed // Otherwise, the implicitly declared copy constructor will have 1074193326Sed // the form 1075193326Sed // 1076193326Sed // X::X(X&) 1077193326Sed QualType ArgType = ClassType; 1078193326Sed if (HasConstCopyConstructor) 1079193326Sed ArgType = ArgType.withConst(); 1080193326Sed ArgType = Context.getLValueReferenceType(ArgType); 1081193326Sed 1082193326Sed // An implicitly-declared copy constructor is an inline public 1083193326Sed // member of its class. 1084193326Sed DeclarationName Name 1085193326Sed = Context.DeclarationNames.getCXXConstructorName(ClassType); 1086193326Sed CXXConstructorDecl *CopyConstructor 1087193326Sed = CXXConstructorDecl::Create(Context, ClassDecl, 1088193326Sed ClassDecl->getLocation(), Name, 1089193326Sed Context.getFunctionType(Context.VoidTy, 1090193326Sed &ArgType, 1, 1091193326Sed false, 0), 1092193326Sed /*isExplicit=*/false, 1093193326Sed /*isInline=*/true, 1094193326Sed /*isImplicitlyDeclared=*/true); 1095193326Sed CopyConstructor->setAccess(AS_public); 1096193326Sed CopyConstructor->setImplicit(); 1097193326Sed 1098193326Sed // Add the parameter to the constructor. 1099193326Sed ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1100193326Sed ClassDecl->getLocation(), 1101193326Sed /*IdentifierInfo=*/0, 1102193326Sed ArgType, VarDecl::None, 0); 1103193326Sed CopyConstructor->setParams(Context, &FromParam, 1); 1104193326Sed 1105193326Sed ClassDecl->addedConstructor(Context, CopyConstructor); 1106193326Sed ClassDecl->addDecl(Context, CopyConstructor); 1107193326Sed } 1108193326Sed 1109193326Sed if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1110193326Sed // Note: The following rules are largely analoguous to the copy 1111193326Sed // constructor rules. Note that virtual bases are not taken into account 1112193326Sed // for determining the argument type of the operator. Note also that 1113193326Sed // operators taking an object instead of a reference are allowed. 1114193326Sed // 1115193326Sed // C++ [class.copy]p10: 1116193326Sed // If the class definition does not explicitly declare a copy 1117193326Sed // assignment operator, one is declared implicitly. 1118193326Sed // The implicitly-defined copy assignment operator for a class X 1119193326Sed // will have the form 1120193326Sed // 1121193326Sed // X& X::operator=(const X&) 1122193326Sed // 1123193326Sed // if 1124193326Sed bool HasConstCopyAssignment = true; 1125193326Sed 1126193326Sed // -- each direct base class B of X has a copy assignment operator 1127193326Sed // whose parameter is of type const B&, const volatile B& or B, 1128193326Sed // and 1129193326Sed for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1130193326Sed HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1131193326Sed const CXXRecordDecl *BaseClassDecl 1132193326Sed = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1133193326Sed HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1134193326Sed } 1135193326Sed 1136193326Sed // -- for all the nonstatic data members of X that are of a class 1137193326Sed // type M (or array thereof), each such class type has a copy 1138193326Sed // assignment operator whose parameter is of type const M&, 1139193326Sed // const volatile M& or M. 1140193326Sed for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); 1141193326Sed HasConstCopyAssignment && Field != ClassDecl->field_end(Context); 1142193326Sed ++Field) { 1143193326Sed QualType FieldType = (*Field)->getType(); 1144193326Sed if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1145193326Sed FieldType = Array->getElementType(); 1146193326Sed if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1147193326Sed const CXXRecordDecl *FieldClassDecl 1148193326Sed = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1149193326Sed HasConstCopyAssignment 1150193326Sed = FieldClassDecl->hasConstCopyAssignment(Context); 1151193326Sed } 1152193326Sed } 1153193326Sed 1154193326Sed // Otherwise, the implicitly declared copy assignment operator will 1155193326Sed // have the form 1156193326Sed // 1157193326Sed // X& X::operator=(X&) 1158193326Sed QualType ArgType = ClassType; 1159193326Sed QualType RetType = Context.getLValueReferenceType(ArgType); 1160193326Sed if (HasConstCopyAssignment) 1161193326Sed ArgType = ArgType.withConst(); 1162193326Sed ArgType = Context.getLValueReferenceType(ArgType); 1163193326Sed 1164193326Sed // An implicitly-declared copy assignment operator is an inline public 1165193326Sed // member of its class. 1166193326Sed DeclarationName Name = 1167193326Sed Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1168193326Sed CXXMethodDecl *CopyAssignment = 1169193326Sed CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1170193326Sed Context.getFunctionType(RetType, &ArgType, 1, 1171193326Sed false, 0), 1172193326Sed /*isStatic=*/false, /*isInline=*/true); 1173193326Sed CopyAssignment->setAccess(AS_public); 1174193326Sed CopyAssignment->setImplicit(); 1175193326Sed 1176193326Sed // Add the parameter to the operator. 1177193326Sed ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1178193326Sed ClassDecl->getLocation(), 1179193326Sed /*IdentifierInfo=*/0, 1180193326Sed ArgType, VarDecl::None, 0); 1181193326Sed CopyAssignment->setParams(Context, &FromParam, 1); 1182193326Sed 1183193326Sed // Don't call addedAssignmentOperator. There is no way to distinguish an 1184193326Sed // implicit from an explicit assignment operator. 1185193326Sed ClassDecl->addDecl(Context, CopyAssignment); 1186193326Sed } 1187193326Sed 1188193326Sed if (!ClassDecl->hasUserDeclaredDestructor()) { 1189193326Sed // C++ [class.dtor]p2: 1190193326Sed // If a class has no user-declared destructor, a destructor is 1191193326Sed // declared implicitly. An implicitly-declared destructor is an 1192193326Sed // inline public member of its class. 1193193326Sed DeclarationName Name 1194193326Sed = Context.DeclarationNames.getCXXDestructorName(ClassType); 1195193326Sed CXXDestructorDecl *Destructor 1196193326Sed = CXXDestructorDecl::Create(Context, ClassDecl, 1197193326Sed ClassDecl->getLocation(), Name, 1198193326Sed Context.getFunctionType(Context.VoidTy, 1199193326Sed 0, 0, false, 0), 1200193326Sed /*isInline=*/true, 1201193326Sed /*isImplicitlyDeclared=*/true); 1202193326Sed Destructor->setAccess(AS_public); 1203193326Sed Destructor->setImplicit(); 1204193326Sed ClassDecl->addDecl(Context, Destructor); 1205193326Sed } 1206193326Sed} 1207193326Sed 1208193326Sedvoid Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1209193326Sed TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1210193326Sed if (!Template) 1211193326Sed return; 1212193326Sed 1213193326Sed TemplateParameterList *Params = Template->getTemplateParameters(); 1214193326Sed for (TemplateParameterList::iterator Param = Params->begin(), 1215193326Sed ParamEnd = Params->end(); 1216193326Sed Param != ParamEnd; ++Param) { 1217193326Sed NamedDecl *Named = cast<NamedDecl>(*Param); 1218193326Sed if (Named->getDeclName()) { 1219193326Sed S->AddDecl(DeclPtrTy::make(Named)); 1220193326Sed IdResolver.AddDecl(Named); 1221193326Sed } 1222193326Sed } 1223193326Sed} 1224193326Sed 1225193326Sed/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1226193326Sed/// parsing a top-level (non-nested) C++ class, and we are now 1227193326Sed/// parsing those parts of the given Method declaration that could 1228193326Sed/// not be parsed earlier (C++ [class.mem]p2), such as default 1229193326Sed/// arguments. This action should enter the scope of the given 1230193326Sed/// Method declaration as if we had just parsed the qualified method 1231193326Sed/// name. However, it should not bring the parameters into scope; 1232193326Sed/// that will be performed by ActOnDelayedCXXMethodParameter. 1233193326Sedvoid Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1234193326Sed CXXScopeSpec SS; 1235193326Sed FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1236193326Sed QualType ClassTy 1237193326Sed = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1238193326Sed SS.setScopeRep( 1239193326Sed NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1240193326Sed ActOnCXXEnterDeclaratorScope(S, SS); 1241193326Sed} 1242193326Sed 1243193326Sed/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1244193326Sed/// C++ method declaration. We're (re-)introducing the given 1245193326Sed/// function parameter into scope for use in parsing later parts of 1246193326Sed/// the method declaration. For example, we could see an 1247193326Sed/// ActOnParamDefaultArgument event for this parameter. 1248193326Sedvoid Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1249193326Sed ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1250193326Sed 1251193326Sed // If this parameter has an unparsed default argument, clear it out 1252193326Sed // to make way for the parsed default argument. 1253193326Sed if (Param->hasUnparsedDefaultArg()) 1254193326Sed Param->setDefaultArg(0); 1255193326Sed 1256193326Sed S->AddDecl(DeclPtrTy::make(Param)); 1257193326Sed if (Param->getDeclName()) 1258193326Sed IdResolver.AddDecl(Param); 1259193326Sed} 1260193326Sed 1261193326Sed/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1262193326Sed/// processing the delayed method declaration for Method. The method 1263193326Sed/// declaration is now considered finished. There may be a separate 1264193326Sed/// ActOnStartOfFunctionDef action later (not necessarily 1265193326Sed/// immediately!) for this method, if it was also defined inside the 1266193326Sed/// class body. 1267193326Sedvoid Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1268193326Sed FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1269193326Sed CXXScopeSpec SS; 1270193326Sed QualType ClassTy 1271193326Sed = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1272193326Sed SS.setScopeRep( 1273193326Sed NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1274193326Sed ActOnCXXExitDeclaratorScope(S, SS); 1275193326Sed 1276193326Sed // Now that we have our default arguments, check the constructor 1277193326Sed // again. It could produce additional diagnostics or affect whether 1278193326Sed // the class has implicitly-declared destructors, among other 1279193326Sed // things. 1280193326Sed if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1281193326Sed CheckConstructor(Constructor); 1282193326Sed 1283193326Sed // Check the default arguments, which we may have added. 1284193326Sed if (!Method->isInvalidDecl()) 1285193326Sed CheckCXXDefaultArguments(Method); 1286193326Sed} 1287193326Sed 1288193326Sed/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1289193326Sed/// the well-formedness of the constructor declarator @p D with type @p 1290193326Sed/// R. If there are any errors in the declarator, this routine will 1291193326Sed/// emit diagnostics and set the invalid bit to true. In any case, the type 1292193326Sed/// will be updated to reflect a well-formed type for the constructor and 1293193326Sed/// returned. 1294193326SedQualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1295193326Sed FunctionDecl::StorageClass &SC) { 1296193326Sed bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1297193326Sed 1298193326Sed // C++ [class.ctor]p3: 1299193326Sed // A constructor shall not be virtual (10.3) or static (9.4). A 1300193326Sed // constructor can be invoked for a const, volatile or const 1301193326Sed // volatile object. A constructor shall not be declared const, 1302193326Sed // volatile, or const volatile (9.3.2). 1303193326Sed if (isVirtual) { 1304193326Sed if (!D.isInvalidType()) 1305193326Sed Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1306193326Sed << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1307193326Sed << SourceRange(D.getIdentifierLoc()); 1308193326Sed D.setInvalidType(); 1309193326Sed } 1310193326Sed if (SC == FunctionDecl::Static) { 1311193326Sed if (!D.isInvalidType()) 1312193326Sed Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1313193326Sed << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1314193326Sed << SourceRange(D.getIdentifierLoc()); 1315193326Sed D.setInvalidType(); 1316193326Sed SC = FunctionDecl::None; 1317193326Sed } 1318193326Sed 1319193326Sed DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1320193326Sed if (FTI.TypeQuals != 0) { 1321193326Sed if (FTI.TypeQuals & QualType::Const) 1322193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1323193326Sed << "const" << SourceRange(D.getIdentifierLoc()); 1324193326Sed if (FTI.TypeQuals & QualType::Volatile) 1325193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1326193326Sed << "volatile" << SourceRange(D.getIdentifierLoc()); 1327193326Sed if (FTI.TypeQuals & QualType::Restrict) 1328193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1329193326Sed << "restrict" << SourceRange(D.getIdentifierLoc()); 1330193326Sed } 1331193326Sed 1332193326Sed // Rebuild the function type "R" without any type qualifiers (in 1333193326Sed // case any of the errors above fired) and with "void" as the 1334193326Sed // return type, since constructors don't have return types. We 1335193326Sed // *always* have to do this, because GetTypeForDeclarator will 1336193326Sed // put in a result type of "int" when none was specified. 1337193326Sed const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1338193326Sed return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1339193326Sed Proto->getNumArgs(), 1340193326Sed Proto->isVariadic(), 0); 1341193326Sed} 1342193326Sed 1343193326Sed/// CheckConstructor - Checks a fully-formed constructor for 1344193326Sed/// well-formedness, issuing any diagnostics required. Returns true if 1345193326Sed/// the constructor declarator is invalid. 1346193326Sedvoid Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1347193326Sed CXXRecordDecl *ClassDecl 1348193326Sed = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1349193326Sed if (!ClassDecl) 1350193326Sed return Constructor->setInvalidDecl(); 1351193326Sed 1352193326Sed // C++ [class.copy]p3: 1353193326Sed // A declaration of a constructor for a class X is ill-formed if 1354193326Sed // its first parameter is of type (optionally cv-qualified) X and 1355193326Sed // either there are no other parameters or else all other 1356193326Sed // parameters have default arguments. 1357193326Sed if (!Constructor->isInvalidDecl() && 1358193326Sed ((Constructor->getNumParams() == 1) || 1359193326Sed (Constructor->getNumParams() > 1 && 1360193326Sed Constructor->getParamDecl(1)->getDefaultArg() != 0))) { 1361193326Sed QualType ParamType = Constructor->getParamDecl(0)->getType(); 1362193326Sed QualType ClassTy = Context.getTagDeclType(ClassDecl); 1363193326Sed if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1364193326Sed SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1365193326Sed Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1366193326Sed << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1367193326Sed Constructor->setInvalidDecl(); 1368193326Sed } 1369193326Sed } 1370193326Sed 1371193326Sed // Notify the class that we've added a constructor. 1372193326Sed ClassDecl->addedConstructor(Context, Constructor); 1373193326Sed} 1374193326Sed 1375193326Sedstatic inline bool 1376193326SedFTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1377193326Sed return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1378193326Sed FTI.ArgInfo[0].Param && 1379193326Sed FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1380193326Sed} 1381193326Sed 1382193326Sed/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1383193326Sed/// the well-formednes of the destructor declarator @p D with type @p 1384193326Sed/// R. If there are any errors in the declarator, this routine will 1385193326Sed/// emit diagnostics and set the declarator to invalid. Even if this happens, 1386193326Sed/// will be updated to reflect a well-formed type for the destructor and 1387193326Sed/// returned. 1388193326SedQualType Sema::CheckDestructorDeclarator(Declarator &D, 1389193326Sed FunctionDecl::StorageClass& SC) { 1390193326Sed // C++ [class.dtor]p1: 1391193326Sed // [...] A typedef-name that names a class is a class-name 1392193326Sed // (7.1.3); however, a typedef-name that names a class shall not 1393193326Sed // be used as the identifier in the declarator for a destructor 1394193326Sed // declaration. 1395193326Sed QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1396193326Sed if (isa<TypedefType>(DeclaratorType)) { 1397193326Sed Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1398193326Sed << DeclaratorType; 1399193326Sed D.setInvalidType(); 1400193326Sed } 1401193326Sed 1402193326Sed // C++ [class.dtor]p2: 1403193326Sed // A destructor is used to destroy objects of its class type. A 1404193326Sed // destructor takes no parameters, and no return type can be 1405193326Sed // specified for it (not even void). The address of a destructor 1406193326Sed // shall not be taken. A destructor shall not be static. A 1407193326Sed // destructor can be invoked for a const, volatile or const 1408193326Sed // volatile object. A destructor shall not be declared const, 1409193326Sed // volatile or const volatile (9.3.2). 1410193326Sed if (SC == FunctionDecl::Static) { 1411193326Sed if (!D.isInvalidType()) 1412193326Sed Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1413193326Sed << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1414193326Sed << SourceRange(D.getIdentifierLoc()); 1415193326Sed SC = FunctionDecl::None; 1416193326Sed D.setInvalidType(); 1417193326Sed } 1418193326Sed if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1419193326Sed // Destructors don't have return types, but the parser will 1420193326Sed // happily parse something like: 1421193326Sed // 1422193326Sed // class X { 1423193326Sed // float ~X(); 1424193326Sed // }; 1425193326Sed // 1426193326Sed // The return type will be eliminated later. 1427193326Sed Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1428193326Sed << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1429193326Sed << SourceRange(D.getIdentifierLoc()); 1430193326Sed } 1431193326Sed 1432193326Sed DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1433193326Sed if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1434193326Sed if (FTI.TypeQuals & QualType::Const) 1435193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1436193326Sed << "const" << SourceRange(D.getIdentifierLoc()); 1437193326Sed if (FTI.TypeQuals & QualType::Volatile) 1438193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1439193326Sed << "volatile" << SourceRange(D.getIdentifierLoc()); 1440193326Sed if (FTI.TypeQuals & QualType::Restrict) 1441193326Sed Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1442193326Sed << "restrict" << SourceRange(D.getIdentifierLoc()); 1443193326Sed D.setInvalidType(); 1444193326Sed } 1445193326Sed 1446193326Sed // Make sure we don't have any parameters. 1447193326Sed if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1448193326Sed Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1449193326Sed 1450193326Sed // Delete the parameters. 1451193326Sed FTI.freeArgs(); 1452193326Sed D.setInvalidType(); 1453193326Sed } 1454193326Sed 1455193326Sed // Make sure the destructor isn't variadic. 1456193326Sed if (FTI.isVariadic) { 1457193326Sed Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1458193326Sed D.setInvalidType(); 1459193326Sed } 1460193326Sed 1461193326Sed // Rebuild the function type "R" without any type qualifiers or 1462193326Sed // parameters (in case any of the errors above fired) and with 1463193326Sed // "void" as the return type, since destructors don't have return 1464193326Sed // types. We *always* have to do this, because GetTypeForDeclarator 1465193326Sed // will put in a result type of "int" when none was specified. 1466193326Sed return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1467193326Sed} 1468193326Sed 1469193326Sed/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1470193326Sed/// well-formednes of the conversion function declarator @p D with 1471193326Sed/// type @p R. If there are any errors in the declarator, this routine 1472193326Sed/// will emit diagnostics and return true. Otherwise, it will return 1473193326Sed/// false. Either way, the type @p R will be updated to reflect a 1474193326Sed/// well-formed type for the conversion operator. 1475193326Sedvoid Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1476193326Sed FunctionDecl::StorageClass& SC) { 1477193326Sed // C++ [class.conv.fct]p1: 1478193326Sed // Neither parameter types nor return type can be specified. The 1479193326Sed // type of a conversion function (8.3.5) is ���function taking no 1480193326Sed // parameter returning conversion-type-id.��� 1481193326Sed if (SC == FunctionDecl::Static) { 1482193326Sed if (!D.isInvalidType()) 1483193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1484193326Sed << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1485193326Sed << SourceRange(D.getIdentifierLoc()); 1486193326Sed D.setInvalidType(); 1487193326Sed SC = FunctionDecl::None; 1488193326Sed } 1489193326Sed if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1490193326Sed // Conversion functions don't have return types, but the parser will 1491193326Sed // happily parse something like: 1492193326Sed // 1493193326Sed // class X { 1494193326Sed // float operator bool(); 1495193326Sed // }; 1496193326Sed // 1497193326Sed // The return type will be changed later anyway. 1498193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1499193326Sed << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1500193326Sed << SourceRange(D.getIdentifierLoc()); 1501193326Sed } 1502193326Sed 1503193326Sed // Make sure we don't have any parameters. 1504193326Sed if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1505193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1506193326Sed 1507193326Sed // Delete the parameters. 1508193326Sed D.getTypeObject(0).Fun.freeArgs(); 1509193326Sed D.setInvalidType(); 1510193326Sed } 1511193326Sed 1512193326Sed // Make sure the conversion function isn't variadic. 1513193326Sed if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1514193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1515193326Sed D.setInvalidType(); 1516193326Sed } 1517193326Sed 1518193326Sed // C++ [class.conv.fct]p4: 1519193326Sed // The conversion-type-id shall not represent a function type nor 1520193326Sed // an array type. 1521193326Sed QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1522193326Sed if (ConvType->isArrayType()) { 1523193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1524193326Sed ConvType = Context.getPointerType(ConvType); 1525193326Sed D.setInvalidType(); 1526193326Sed } else if (ConvType->isFunctionType()) { 1527193326Sed Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1528193326Sed ConvType = Context.getPointerType(ConvType); 1529193326Sed D.setInvalidType(); 1530193326Sed } 1531193326Sed 1532193326Sed // Rebuild the function type "R" without any parameters (in case any 1533193326Sed // of the errors above fired) and with the conversion type as the 1534193326Sed // return type. 1535193326Sed R = Context.getFunctionType(ConvType, 0, 0, false, 1536193326Sed R->getAsFunctionProtoType()->getTypeQuals()); 1537193326Sed 1538193326Sed // C++0x explicit conversion operators. 1539193326Sed if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1540193326Sed Diag(D.getDeclSpec().getExplicitSpecLoc(), 1541193326Sed diag::warn_explicit_conversion_functions) 1542193326Sed << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1543193326Sed} 1544193326Sed 1545193326Sed/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1546193326Sed/// the declaration of the given C++ conversion function. This routine 1547193326Sed/// is responsible for recording the conversion function in the C++ 1548193326Sed/// class, if possible. 1549193326SedSema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1550193326Sed assert(Conversion && "Expected to receive a conversion function declaration"); 1551193326Sed 1552193326Sed // Set the lexical context of this conversion function 1553193326Sed Conversion->setLexicalDeclContext(CurContext); 1554193326Sed 1555193326Sed CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1556193326Sed 1557193326Sed // Make sure we aren't redeclaring the conversion function. 1558193326Sed QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1559193326Sed 1560193326Sed // C++ [class.conv.fct]p1: 1561193326Sed // [...] A conversion function is never used to convert a 1562193326Sed // (possibly cv-qualified) object to the (possibly cv-qualified) 1563193326Sed // same object type (or a reference to it), to a (possibly 1564193326Sed // cv-qualified) base class of that type (or a reference to it), 1565193326Sed // or to (possibly cv-qualified) void. 1566193326Sed // FIXME: Suppress this warning if the conversion function ends up being a 1567193326Sed // virtual function that overrides a virtual function in a base class. 1568193326Sed QualType ClassType 1569193326Sed = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1570193326Sed if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1571193326Sed ConvType = ConvTypeRef->getPointeeType(); 1572193326Sed if (ConvType->isRecordType()) { 1573193326Sed ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1574193326Sed if (ConvType == ClassType) 1575193326Sed Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1576193326Sed << ClassType; 1577193326Sed else if (IsDerivedFrom(ClassType, ConvType)) 1578193326Sed Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1579193326Sed << ClassType << ConvType; 1580193326Sed } else if (ConvType->isVoidType()) { 1581193326Sed Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1582193326Sed << ClassType << ConvType; 1583193326Sed } 1584193326Sed 1585193326Sed if (Conversion->getPreviousDeclaration()) { 1586193326Sed OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1587193326Sed for (OverloadedFunctionDecl::function_iterator 1588193326Sed Conv = Conversions->function_begin(), 1589193326Sed ConvEnd = Conversions->function_end(); 1590193326Sed Conv != ConvEnd; ++Conv) { 1591193326Sed if (*Conv == Conversion->getPreviousDeclaration()) { 1592193326Sed *Conv = Conversion; 1593193326Sed return DeclPtrTy::make(Conversion); 1594193326Sed } 1595193326Sed } 1596193326Sed assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1597193326Sed } else 1598193326Sed ClassDecl->addConversionFunction(Context, Conversion); 1599193326Sed 1600193326Sed return DeclPtrTy::make(Conversion); 1601193326Sed} 1602193326Sed 1603193326Sed//===----------------------------------------------------------------------===// 1604193326Sed// Namespace Handling 1605193326Sed//===----------------------------------------------------------------------===// 1606193326Sed 1607193326Sed/// ActOnStartNamespaceDef - This is called at the start of a namespace 1608193326Sed/// definition. 1609193326SedSema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1610193326Sed SourceLocation IdentLoc, 1611193326Sed IdentifierInfo *II, 1612193326Sed SourceLocation LBrace) { 1613193326Sed NamespaceDecl *Namespc = 1614193326Sed NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1615193326Sed Namespc->setLBracLoc(LBrace); 1616193326Sed 1617193326Sed Scope *DeclRegionScope = NamespcScope->getParent(); 1618193326Sed 1619193326Sed if (II) { 1620193326Sed // C++ [namespace.def]p2: 1621193326Sed // The identifier in an original-namespace-definition shall not have been 1622193326Sed // previously defined in the declarative region in which the 1623193326Sed // original-namespace-definition appears. The identifier in an 1624193326Sed // original-namespace-definition is the name of the namespace. Subsequently 1625193326Sed // in that declarative region, it is treated as an original-namespace-name. 1626193326Sed 1627193326Sed NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1628193326Sed true); 1629193326Sed 1630193326Sed if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1631193326Sed // This is an extended namespace definition. 1632193326Sed // Attach this namespace decl to the chain of extended namespace 1633193326Sed // definitions. 1634193326Sed OrigNS->setNextNamespace(Namespc); 1635193326Sed Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1636193326Sed 1637193326Sed // Remove the previous declaration from the scope. 1638193326Sed if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1639193326Sed IdResolver.RemoveDecl(OrigNS); 1640193326Sed DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1641193326Sed } 1642193326Sed } else if (PrevDecl) { 1643193326Sed // This is an invalid name redefinition. 1644193326Sed Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1645193326Sed << Namespc->getDeclName(); 1646193326Sed Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1647193326Sed Namespc->setInvalidDecl(); 1648193326Sed // Continue on to push Namespc as current DeclContext and return it. 1649193326Sed } 1650193326Sed 1651193326Sed PushOnScopeChains(Namespc, DeclRegionScope); 1652193326Sed } else { 1653193326Sed // FIXME: Handle anonymous namespaces 1654193326Sed } 1655193326Sed 1656193326Sed // Although we could have an invalid decl (i.e. the namespace name is a 1657193326Sed // redefinition), push it as current DeclContext and try to continue parsing. 1658193326Sed // FIXME: We should be able to push Namespc here, so that the each DeclContext 1659193326Sed // for the namespace has the declarations that showed up in that particular 1660193326Sed // namespace definition. 1661193326Sed PushDeclContext(NamespcScope, Namespc); 1662193326Sed return DeclPtrTy::make(Namespc); 1663193326Sed} 1664193326Sed 1665193326Sed/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1666193326Sed/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1667193326Sedvoid Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1668193326Sed Decl *Dcl = D.getAs<Decl>(); 1669193326Sed NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1670193326Sed assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1671193326Sed Namespc->setRBracLoc(RBrace); 1672193326Sed PopDeclContext(); 1673193326Sed} 1674193326Sed 1675193326SedSema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1676193326Sed SourceLocation UsingLoc, 1677193326Sed SourceLocation NamespcLoc, 1678193326Sed const CXXScopeSpec &SS, 1679193326Sed SourceLocation IdentLoc, 1680193326Sed IdentifierInfo *NamespcName, 1681193326Sed AttributeList *AttrList) { 1682193326Sed assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1683193326Sed assert(NamespcName && "Invalid NamespcName."); 1684193326Sed assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1685193326Sed assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1686193326Sed 1687193326Sed UsingDirectiveDecl *UDir = 0; 1688193326Sed 1689193326Sed // Lookup namespace name. 1690193326Sed LookupResult R = LookupParsedName(S, &SS, NamespcName, 1691193326Sed LookupNamespaceName, false); 1692193326Sed if (R.isAmbiguous()) { 1693193326Sed DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1694193326Sed return DeclPtrTy(); 1695193326Sed } 1696193326Sed if (NamedDecl *NS = R) { 1697193326Sed assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1698193326Sed // C++ [namespace.udir]p1: 1699193326Sed // A using-directive specifies that the names in the nominated 1700193326Sed // namespace can be used in the scope in which the 1701193326Sed // using-directive appears after the using-directive. During 1702193326Sed // unqualified name lookup (3.4.1), the names appear as if they 1703193326Sed // were declared in the nearest enclosing namespace which 1704193326Sed // contains both the using-directive and the nominated 1705193326Sed // namespace. [Note: in this context, ���contains��� means ���contains 1706193326Sed // directly or indirectly���. ] 1707193326Sed 1708193326Sed // Find enclosing context containing both using-directive and 1709193326Sed // nominated namespace. 1710193326Sed DeclContext *CommonAncestor = cast<DeclContext>(NS); 1711193326Sed while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1712193326Sed CommonAncestor = CommonAncestor->getParent(); 1713193326Sed 1714193326Sed UDir = UsingDirectiveDecl::Create(Context, 1715193326Sed CurContext, UsingLoc, 1716193326Sed NamespcLoc, 1717193326Sed SS.getRange(), 1718193326Sed (NestedNameSpecifier *)SS.getScopeRep(), 1719193326Sed IdentLoc, 1720193326Sed cast<NamespaceDecl>(NS), 1721193326Sed CommonAncestor); 1722193326Sed PushUsingDirective(S, UDir); 1723193326Sed } else { 1724193326Sed Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1725193326Sed } 1726193326Sed 1727193326Sed // FIXME: We ignore attributes for now. 1728193326Sed delete AttrList; 1729193326Sed return DeclPtrTy::make(UDir); 1730193326Sed} 1731193326Sed 1732193326Sedvoid Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1733193326Sed // If scope has associated entity, then using directive is at namespace 1734193326Sed // or translation unit scope. We add UsingDirectiveDecls, into 1735193326Sed // it's lookup structure. 1736193326Sed if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1737193326Sed Ctx->addDecl(Context, UDir); 1738193326Sed else 1739193326Sed // Otherwise it is block-sope. using-directives will affect lookup 1740193326Sed // only to the end of scope. 1741193326Sed S->PushUsingDirective(DeclPtrTy::make(UDir)); 1742193326Sed} 1743193326Sed 1744193326Sed/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1745193326Sed/// is a namespace alias, returns the namespace it points to. 1746193326Sedstatic inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1747193326Sed if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1748193326Sed return AD->getNamespace(); 1749193326Sed return dyn_cast_or_null<NamespaceDecl>(D); 1750193326Sed} 1751193326Sed 1752193326SedSema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1753193326Sed SourceLocation NamespaceLoc, 1754193326Sed SourceLocation AliasLoc, 1755193326Sed IdentifierInfo *Alias, 1756193326Sed const CXXScopeSpec &SS, 1757193326Sed SourceLocation IdentLoc, 1758193326Sed IdentifierInfo *Ident) { 1759193326Sed 1760193326Sed // Lookup the namespace name. 1761193326Sed LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 1762193326Sed 1763193326Sed // Check if we have a previous declaration with the same name. 1764193326Sed if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 1765193326Sed if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 1766193326Sed // We already have an alias with the same name that points to the same 1767193326Sed // namespace, so don't create a new one. 1768193326Sed if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 1769193326Sed return DeclPtrTy(); 1770193326Sed } 1771193326Sed 1772193326Sed unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 1773193326Sed diag::err_redefinition_different_kind; 1774193326Sed Diag(AliasLoc, DiagID) << Alias; 1775193326Sed Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1776193326Sed return DeclPtrTy(); 1777193326Sed } 1778193326Sed 1779193326Sed if (R.isAmbiguous()) { 1780193326Sed DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 1781193326Sed return DeclPtrTy(); 1782193326Sed } 1783193326Sed 1784193326Sed if (!R) { 1785193326Sed Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 1786193326Sed return DeclPtrTy(); 1787193326Sed } 1788193326Sed 1789193326Sed NamespaceAliasDecl *AliasDecl = 1790193326Sed NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 1791193326Sed Alias, SS.getRange(), 1792193326Sed (NestedNameSpecifier *)SS.getScopeRep(), 1793193326Sed IdentLoc, R); 1794193326Sed 1795193326Sed CurContext->addDecl(Context, AliasDecl); 1796193326Sed return DeclPtrTy::make(AliasDecl); 1797193326Sed} 1798193326Sed 1799193326Sedvoid Sema::InitializeVarWithConstructor(VarDecl *VD, 1800193326Sed CXXConstructorDecl *Constructor, 1801193326Sed QualType DeclInitType, 1802193326Sed Expr **Exprs, unsigned NumExprs) { 1803193326Sed Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 1804193326Sed false, Exprs, NumExprs); 1805193326Sed VD->setInit(Context, Temp); 1806193326Sed} 1807193326Sed 1808193326Sed/// AddCXXDirectInitializerToDecl - This action is called immediately after 1809193326Sed/// ActOnDeclarator, when a C++ direct initializer is present. 1810193326Sed/// e.g: "int x(1);" 1811193326Sedvoid Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 1812193326Sed SourceLocation LParenLoc, 1813193326Sed MultiExprArg Exprs, 1814193326Sed SourceLocation *CommaLocs, 1815193326Sed SourceLocation RParenLoc) { 1816193326Sed unsigned NumExprs = Exprs.size(); 1817193326Sed assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 1818193326Sed Decl *RealDecl = Dcl.getAs<Decl>(); 1819193326Sed 1820193326Sed // If there is no declaration, there was an error parsing it. Just ignore 1821193326Sed // the initializer. 1822193326Sed if (RealDecl == 0) 1823193326Sed return; 1824193326Sed 1825193326Sed VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1826193326Sed if (!VDecl) { 1827193326Sed Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1828193326Sed RealDecl->setInvalidDecl(); 1829193326Sed return; 1830193326Sed } 1831193326Sed 1832193326Sed // FIXME: Need to handle dependent types and expressions here. 1833193326Sed 1834193326Sed // We will treat direct-initialization as a copy-initialization: 1835193326Sed // int x(1); -as-> int x = 1; 1836193326Sed // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1837193326Sed // 1838193326Sed // Clients that want to distinguish between the two forms, can check for 1839193326Sed // direct initializer using VarDecl::hasCXXDirectInitializer(). 1840193326Sed // A major benefit is that clients that don't particularly care about which 1841193326Sed // exactly form was it (like the CodeGen) can handle both cases without 1842193326Sed // special case code. 1843193326Sed 1844193326Sed // C++ 8.5p11: 1845193326Sed // The form of initialization (using parentheses or '=') is generally 1846193326Sed // insignificant, but does matter when the entity being initialized has a 1847193326Sed // class type. 1848193326Sed QualType DeclInitType = VDecl->getType(); 1849193326Sed if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1850193326Sed DeclInitType = Array->getElementType(); 1851193326Sed 1852193326Sed // FIXME: This isn't the right place to complete the type. 1853193326Sed if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 1854193326Sed diag::err_typecheck_decl_incomplete_type)) { 1855193326Sed VDecl->setInvalidDecl(); 1856193326Sed return; 1857193326Sed } 1858193326Sed 1859193326Sed if (VDecl->getType()->isRecordType()) { 1860193326Sed CXXConstructorDecl *Constructor 1861193326Sed = PerformInitializationByConstructor(DeclInitType, 1862193326Sed (Expr **)Exprs.get(), NumExprs, 1863193326Sed VDecl->getLocation(), 1864193326Sed SourceRange(VDecl->getLocation(), 1865193326Sed RParenLoc), 1866193326Sed VDecl->getDeclName(), 1867193326Sed IK_Direct); 1868193326Sed if (!Constructor) 1869193326Sed RealDecl->setInvalidDecl(); 1870193326Sed else { 1871193326Sed VDecl->setCXXDirectInitializer(true); 1872193326Sed InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 1873193326Sed (Expr**)Exprs.release(), NumExprs); 1874193326Sed } 1875193326Sed return; 1876193326Sed } 1877193326Sed 1878193326Sed if (NumExprs > 1) { 1879193326Sed Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1880193326Sed << SourceRange(VDecl->getLocation(), RParenLoc); 1881193326Sed RealDecl->setInvalidDecl(); 1882193326Sed return; 1883193326Sed } 1884193326Sed 1885193326Sed // Let clients know that initialization was done with a direct initializer. 1886193326Sed VDecl->setCXXDirectInitializer(true); 1887193326Sed 1888193326Sed assert(NumExprs == 1 && "Expected 1 expression"); 1889193326Sed // Set the init expression, handles conversions. 1890193326Sed AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 1891193326Sed /*DirectInit=*/true); 1892193326Sed} 1893193326Sed 1894193326Sed/// PerformInitializationByConstructor - Perform initialization by 1895193326Sed/// constructor (C++ [dcl.init]p14), which may occur as part of 1896193326Sed/// direct-initialization or copy-initialization. We are initializing 1897193326Sed/// an object of type @p ClassType with the given arguments @p 1898193326Sed/// Args. @p Loc is the location in the source code where the 1899193326Sed/// initializer occurs (e.g., a declaration, member initializer, 1900193326Sed/// functional cast, etc.) while @p Range covers the whole 1901193326Sed/// initialization. @p InitEntity is the entity being initialized, 1902193326Sed/// which may by the name of a declaration or a type. @p Kind is the 1903193326Sed/// kind of initialization we're performing, which affects whether 1904193326Sed/// explicit constructors will be considered. When successful, returns 1905193326Sed/// the constructor that will be used to perform the initialization; 1906193326Sed/// when the initialization fails, emits a diagnostic and returns 1907193326Sed/// null. 1908193326SedCXXConstructorDecl * 1909193326SedSema::PerformInitializationByConstructor(QualType ClassType, 1910193326Sed Expr **Args, unsigned NumArgs, 1911193326Sed SourceLocation Loc, SourceRange Range, 1912193326Sed DeclarationName InitEntity, 1913193326Sed InitializationKind Kind) { 1914193326Sed const RecordType *ClassRec = ClassType->getAsRecordType(); 1915193326Sed assert(ClassRec && "Can only initialize a class type here"); 1916193326Sed 1917193326Sed // C++ [dcl.init]p14: 1918193326Sed // 1919193326Sed // If the initialization is direct-initialization, or if it is 1920193326Sed // copy-initialization where the cv-unqualified version of the 1921193326Sed // source type is the same class as, or a derived class of, the 1922193326Sed // class of the destination, constructors are considered. The 1923193326Sed // applicable constructors are enumerated (13.3.1.3), and the 1924193326Sed // best one is chosen through overload resolution (13.3). The 1925193326Sed // constructor so selected is called to initialize the object, 1926193326Sed // with the initializer expression(s) as its argument(s). If no 1927193326Sed // constructor applies, or the overload resolution is ambiguous, 1928193326Sed // the initialization is ill-formed. 1929193326Sed const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1930193326Sed OverloadCandidateSet CandidateSet; 1931193326Sed 1932193326Sed // Add constructors to the overload set. 1933193326Sed DeclarationName ConstructorName 1934193326Sed = Context.DeclarationNames.getCXXConstructorName( 1935193326Sed Context.getCanonicalType(ClassType.getUnqualifiedType())); 1936193326Sed DeclContext::lookup_const_iterator Con, ConEnd; 1937193326Sed for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); 1938193326Sed Con != ConEnd; ++Con) { 1939193326Sed CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1940193326Sed if ((Kind == IK_Direct) || 1941193326Sed (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1942193326Sed (Kind == IK_Default && Constructor->isDefaultConstructor())) 1943193326Sed AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1944193326Sed } 1945193326Sed 1946193326Sed // FIXME: When we decide not to synthesize the implicitly-declared 1947193326Sed // constructors, we'll need to make them appear here. 1948193326Sed 1949193326Sed OverloadCandidateSet::iterator Best; 1950193326Sed switch (BestViableFunction(CandidateSet, Best)) { 1951193326Sed case OR_Success: 1952193326Sed // We found a constructor. Return it. 1953193326Sed return cast<CXXConstructorDecl>(Best->Function); 1954193326Sed 1955193326Sed case OR_No_Viable_Function: 1956193326Sed if (InitEntity) 1957193326Sed Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1958193326Sed << InitEntity << Range; 1959193326Sed else 1960193326Sed Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1961193326Sed << ClassType << Range; 1962193326Sed PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1963193326Sed return 0; 1964193326Sed 1965193326Sed case OR_Ambiguous: 1966193326Sed if (InitEntity) 1967193326Sed Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1968193326Sed else 1969193326Sed Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1970193326Sed PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1971193326Sed return 0; 1972193326Sed 1973193326Sed case OR_Deleted: 1974193326Sed if (InitEntity) 1975193326Sed Diag(Loc, diag::err_ovl_deleted_init) 1976193326Sed << Best->Function->isDeleted() 1977193326Sed << InitEntity << Range; 1978193326Sed else 1979193326Sed Diag(Loc, diag::err_ovl_deleted_init) 1980193326Sed << Best->Function->isDeleted() 1981193326Sed << InitEntity << Range; 1982193326Sed PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1983193326Sed return 0; 1984193326Sed } 1985193326Sed 1986193326Sed return 0; 1987193326Sed} 1988193326Sed 1989193326Sed/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1990193326Sed/// determine whether they are reference-related, 1991193326Sed/// reference-compatible, reference-compatible with added 1992193326Sed/// qualification, or incompatible, for use in C++ initialization by 1993193326Sed/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1994193326Sed/// type, and the first type (T1) is the pointee type of the reference 1995193326Sed/// type being initialized. 1996193326SedSema::ReferenceCompareResult 1997193326SedSema::CompareReferenceRelationship(QualType T1, QualType T2, 1998193326Sed bool& DerivedToBase) { 1999193326Sed assert(!T1->isReferenceType() && 2000193326Sed "T1 must be the pointee type of the reference type"); 2001193326Sed assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2002193326Sed 2003193326Sed T1 = Context.getCanonicalType(T1); 2004193326Sed T2 = Context.getCanonicalType(T2); 2005193326Sed QualType UnqualT1 = T1.getUnqualifiedType(); 2006193326Sed QualType UnqualT2 = T2.getUnqualifiedType(); 2007193326Sed 2008193326Sed // C++ [dcl.init.ref]p4: 2009193326Sed // Given types ���cv1 T1��� and ���cv2 T2,��� ���cv1 T1��� is 2010193326Sed // reference-related to ���cv2 T2��� if T1 is the same type as T2, or 2011193326Sed // T1 is a base class of T2. 2012193326Sed if (UnqualT1 == UnqualT2) 2013193326Sed DerivedToBase = false; 2014193326Sed else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2015193326Sed DerivedToBase = true; 2016193326Sed else 2017193326Sed return Ref_Incompatible; 2018193326Sed 2019193326Sed // At this point, we know that T1 and T2 are reference-related (at 2020193326Sed // least). 2021193326Sed 2022193326Sed // C++ [dcl.init.ref]p4: 2023193326Sed // "cv1 T1��� is reference-compatible with ���cv2 T2��� if T1 is 2024193326Sed // reference-related to T2 and cv1 is the same cv-qualification 2025193326Sed // as, or greater cv-qualification than, cv2. For purposes of 2026193326Sed // overload resolution, cases for which cv1 is greater 2027193326Sed // cv-qualification than cv2 are identified as 2028193326Sed // reference-compatible with added qualification (see 13.3.3.2). 2029193326Sed if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2030193326Sed return Ref_Compatible; 2031193326Sed else if (T1.isMoreQualifiedThan(T2)) 2032193326Sed return Ref_Compatible_With_Added_Qualification; 2033193326Sed else 2034193326Sed return Ref_Related; 2035193326Sed} 2036193326Sed 2037193326Sed/// CheckReferenceInit - Check the initialization of a reference 2038193326Sed/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2039193326Sed/// the initializer (either a simple initializer or an initializer 2040193326Sed/// list), and DeclType is the type of the declaration. When ICS is 2041193326Sed/// non-null, this routine will compute the implicit conversion 2042193326Sed/// sequence according to C++ [over.ics.ref] and will not produce any 2043193326Sed/// diagnostics; when ICS is null, it will emit diagnostics when any 2044193326Sed/// errors are found. Either way, a return value of true indicates 2045193326Sed/// that there was a failure, a return value of false indicates that 2046193326Sed/// the reference initialization succeeded. 2047193326Sed/// 2048193326Sed/// When @p SuppressUserConversions, user-defined conversions are 2049193326Sed/// suppressed. 2050193326Sed/// When @p AllowExplicit, we also permit explicit user-defined 2051193326Sed/// conversion functions. 2052193326Sed/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2053193326Sedbool 2054193326SedSema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2055193326Sed ImplicitConversionSequence *ICS, 2056193326Sed bool SuppressUserConversions, 2057193326Sed bool AllowExplicit, bool ForceRValue) { 2058193326Sed assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2059193326Sed 2060193326Sed QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2061193326Sed QualType T2 = Init->getType(); 2062193326Sed 2063193326Sed // If the initializer is the address of an overloaded function, try 2064193326Sed // to resolve the overloaded function. If all goes well, T2 is the 2065193326Sed // type of the resulting function. 2066193326Sed if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2067193326Sed FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2068193326Sed ICS != 0); 2069193326Sed if (Fn) { 2070193326Sed // Since we're performing this reference-initialization for 2071193326Sed // real, update the initializer with the resulting function. 2072193326Sed if (!ICS) { 2073193326Sed if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2074193326Sed return true; 2075193326Sed 2076193326Sed FixOverloadedFunctionReference(Init, Fn); 2077193326Sed } 2078193326Sed 2079193326Sed T2 = Fn->getType(); 2080193326Sed } 2081193326Sed } 2082193326Sed 2083193326Sed // Compute some basic properties of the types and the initializer. 2084193326Sed bool isRValRef = DeclType->isRValueReferenceType(); 2085193326Sed bool DerivedToBase = false; 2086193326Sed Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2087193326Sed Init->isLvalue(Context); 2088193326Sed ReferenceCompareResult RefRelationship 2089193326Sed = CompareReferenceRelationship(T1, T2, DerivedToBase); 2090193326Sed 2091193326Sed // Most paths end in a failed conversion. 2092193326Sed if (ICS) 2093193326Sed ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2094193326Sed 2095193326Sed // C++ [dcl.init.ref]p5: 2096193326Sed // A reference to type ���cv1 T1��� is initialized by an expression 2097193326Sed // of type ���cv2 T2��� as follows: 2098193326Sed 2099193326Sed // -- If the initializer expression 2100193326Sed 2101193326Sed // Rvalue references cannot bind to lvalues (N2812). 2102193326Sed // There is absolutely no situation where they can. In particular, note that 2103193326Sed // this is ill-formed, even if B has a user-defined conversion to A&&: 2104193326Sed // B b; 2105193326Sed // A&& r = b; 2106193326Sed if (isRValRef && InitLvalue == Expr::LV_Valid) { 2107193326Sed if (!ICS) 2108193326Sed Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2109193326Sed << Init->getSourceRange(); 2110193326Sed return true; 2111193326Sed } 2112193326Sed 2113193326Sed bool BindsDirectly = false; 2114193326Sed // -- is an lvalue (but is not a bit-field), and ���cv1 T1��� is 2115193326Sed // reference-compatible with ���cv2 T2,��� or 2116193326Sed // 2117193326Sed // Note that the bit-field check is skipped if we are just computing 2118193326Sed // the implicit conversion sequence (C++ [over.best.ics]p2). 2119193326Sed if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2120193326Sed RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2121193326Sed BindsDirectly = true; 2122193326Sed 2123193326Sed if (ICS) { 2124193326Sed // C++ [over.ics.ref]p1: 2125193326Sed // When a parameter of reference type binds directly (8.5.3) 2126193326Sed // to an argument expression, the implicit conversion sequence 2127193326Sed // is the identity conversion, unless the argument expression 2128193326Sed // has a type that is a derived class of the parameter type, 2129193326Sed // in which case the implicit conversion sequence is a 2130193326Sed // derived-to-base Conversion (13.3.3.1). 2131193326Sed ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2132193326Sed ICS->Standard.First = ICK_Identity; 2133193326Sed ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2134193326Sed ICS->Standard.Third = ICK_Identity; 2135193326Sed ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2136193326Sed ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2137193326Sed ICS->Standard.ReferenceBinding = true; 2138193326Sed ICS->Standard.DirectBinding = true; 2139193326Sed ICS->Standard.RRefBinding = false; 2140193326Sed ICS->Standard.CopyConstructor = 0; 2141193326Sed 2142193326Sed // Nothing more to do: the inaccessibility/ambiguity check for 2143193326Sed // derived-to-base conversions is suppressed when we're 2144193326Sed // computing the implicit conversion sequence (C++ 2145193326Sed // [over.best.ics]p2). 2146193326Sed return false; 2147193326Sed } else { 2148193326Sed // Perform the conversion. 2149193326Sed // FIXME: Binding to a subobject of the lvalue is going to require more 2150193326Sed // AST annotation than this. 2151193326Sed ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2152193326Sed } 2153193326Sed } 2154193326Sed 2155193326Sed // -- has a class type (i.e., T2 is a class type) and can be 2156193326Sed // implicitly converted to an lvalue of type ���cv3 T3,��� 2157193326Sed // where ���cv1 T1��� is reference-compatible with ���cv3 T3��� 2158193326Sed // 92) (this conversion is selected by enumerating the 2159193326Sed // applicable conversion functions (13.3.1.6) and choosing 2160193326Sed // the best one through overload resolution (13.3)), 2161193326Sed if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2162193326Sed // FIXME: Look for conversions in base classes! 2163193326Sed CXXRecordDecl *T2RecordDecl 2164193326Sed = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2165193326Sed 2166193326Sed OverloadCandidateSet CandidateSet; 2167193326Sed OverloadedFunctionDecl *Conversions 2168193326Sed = T2RecordDecl->getConversionFunctions(); 2169193326Sed for (OverloadedFunctionDecl::function_iterator Func 2170193326Sed = Conversions->function_begin(); 2171193326Sed Func != Conversions->function_end(); ++Func) { 2172193326Sed CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2173193326Sed 2174193326Sed // If the conversion function doesn't return a reference type, 2175193326Sed // it can't be considered for this conversion. 2176193326Sed if (Conv->getConversionType()->isLValueReferenceType() && 2177193326Sed (AllowExplicit || !Conv->isExplicit())) 2178193326Sed AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2179193326Sed } 2180193326Sed 2181193326Sed OverloadCandidateSet::iterator Best; 2182193326Sed switch (BestViableFunction(CandidateSet, Best)) { 2183193326Sed case OR_Success: 2184193326Sed // This is a direct binding. 2185193326Sed BindsDirectly = true; 2186193326Sed 2187193326Sed if (ICS) { 2188193326Sed // C++ [over.ics.ref]p1: 2189193326Sed // 2190193326Sed // [...] If the parameter binds directly to the result of 2191193326Sed // applying a conversion function to the argument 2192193326Sed // expression, the implicit conversion sequence is a 2193193326Sed // user-defined conversion sequence (13.3.3.1.2), with the 2194193326Sed // second standard conversion sequence either an identity 2195193326Sed // conversion or, if the conversion function returns an 2196193326Sed // entity of a type that is a derived class of the parameter 2197193326Sed // type, a derived-to-base Conversion. 2198193326Sed ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2199193326Sed ICS->UserDefined.Before = Best->Conversions[0].Standard; 2200193326Sed ICS->UserDefined.After = Best->FinalConversion; 2201193326Sed ICS->UserDefined.ConversionFunction = Best->Function; 2202193326Sed assert(ICS->UserDefined.After.ReferenceBinding && 2203193326Sed ICS->UserDefined.After.DirectBinding && 2204193326Sed "Expected a direct reference binding!"); 2205193326Sed return false; 2206193326Sed } else { 2207193326Sed // Perform the conversion. 2208193326Sed // FIXME: Binding to a subobject of the lvalue is going to require more 2209193326Sed // AST annotation than this. 2210193326Sed ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2211193326Sed } 2212193326Sed break; 2213193326Sed 2214193326Sed case OR_Ambiguous: 2215193326Sed assert(false && "Ambiguous reference binding conversions not implemented."); 2216193326Sed return true; 2217193326Sed 2218193326Sed case OR_No_Viable_Function: 2219193326Sed case OR_Deleted: 2220193326Sed // There was no suitable conversion, or we found a deleted 2221193326Sed // conversion; continue with other checks. 2222193326Sed break; 2223193326Sed } 2224193326Sed } 2225193326Sed 2226193326Sed if (BindsDirectly) { 2227193326Sed // C++ [dcl.init.ref]p4: 2228193326Sed // [...] In all cases where the reference-related or 2229193326Sed // reference-compatible relationship of two types is used to 2230193326Sed // establish the validity of a reference binding, and T1 is a 2231193326Sed // base class of T2, a program that necessitates such a binding 2232193326Sed // is ill-formed if T1 is an inaccessible (clause 11) or 2233193326Sed // ambiguous (10.2) base class of T2. 2234193326Sed // 2235193326Sed // Note that we only check this condition when we're allowed to 2236193326Sed // complain about errors, because we should not be checking for 2237193326Sed // ambiguity (or inaccessibility) unless the reference binding 2238193326Sed // actually happens. 2239193326Sed if (DerivedToBase) 2240193326Sed return CheckDerivedToBaseConversion(T2, T1, 2241193326Sed Init->getSourceRange().getBegin(), 2242193326Sed Init->getSourceRange()); 2243193326Sed else 2244193326Sed return false; 2245193326Sed } 2246193326Sed 2247193326Sed // -- Otherwise, the reference shall be to a non-volatile const 2248193326Sed // type (i.e., cv1 shall be const), or the reference shall be an 2249193326Sed // rvalue reference and the initializer expression shall be an rvalue. 2250193326Sed if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2251193326Sed if (!ICS) 2252193326Sed Diag(Init->getSourceRange().getBegin(), 2253193326Sed diag::err_not_reference_to_const_init) 2254193326Sed << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2255193326Sed << T2 << Init->getSourceRange(); 2256193326Sed return true; 2257193326Sed } 2258193326Sed 2259193326Sed // -- If the initializer expression is an rvalue, with T2 a 2260193326Sed // class type, and ���cv1 T1��� is reference-compatible with 2261193326Sed // ���cv2 T2,��� the reference is bound in one of the 2262193326Sed // following ways (the choice is implementation-defined): 2263193326Sed // 2264193326Sed // -- The reference is bound to the object represented by 2265193326Sed // the rvalue (see 3.10) or to a sub-object within that 2266193326Sed // object. 2267193326Sed // 2268193326Sed // -- A temporary of type ���cv1 T2��� [sic] is created, and 2269193326Sed // a constructor is called to copy the entire rvalue 2270193326Sed // object into the temporary. The reference is bound to 2271193326Sed // the temporary or to a sub-object within the 2272193326Sed // temporary. 2273193326Sed // 2274193326Sed // The constructor that would be used to make the copy 2275193326Sed // shall be callable whether or not the copy is actually 2276193326Sed // done. 2277193326Sed // 2278193326Sed // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2279193326Sed // freedom, so we will always take the first option and never build 2280193326Sed // a temporary in this case. FIXME: We will, however, have to check 2281193326Sed // for the presence of a copy constructor in C++98/03 mode. 2282193326Sed if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2283193326Sed RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2284193326Sed if (ICS) { 2285193326Sed ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2286193326Sed ICS->Standard.First = ICK_Identity; 2287193326Sed ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2288193326Sed ICS->Standard.Third = ICK_Identity; 2289193326Sed ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2290193326Sed ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2291193326Sed ICS->Standard.ReferenceBinding = true; 2292193326Sed ICS->Standard.DirectBinding = false; 2293193326Sed ICS->Standard.RRefBinding = isRValRef; 2294193326Sed ICS->Standard.CopyConstructor = 0; 2295193326Sed } else { 2296193326Sed // FIXME: Binding to a subobject of the rvalue is going to require more 2297193326Sed // AST annotation than this. 2298193326Sed ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2299193326Sed } 2300193326Sed return false; 2301193326Sed } 2302193326Sed 2303193326Sed // -- Otherwise, a temporary of type ���cv1 T1��� is created and 2304193326Sed // initialized from the initializer expression using the 2305193326Sed // rules for a non-reference copy initialization (8.5). The 2306193326Sed // reference is then bound to the temporary. If T1 is 2307193326Sed // reference-related to T2, cv1 must be the same 2308193326Sed // cv-qualification as, or greater cv-qualification than, 2309193326Sed // cv2; otherwise, the program is ill-formed. 2310193326Sed if (RefRelationship == Ref_Related) { 2311193326Sed // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2312193326Sed // we would be reference-compatible or reference-compatible with 2313193326Sed // added qualification. But that wasn't the case, so the reference 2314193326Sed // initialization fails. 2315193326Sed if (!ICS) 2316193326Sed Diag(Init->getSourceRange().getBegin(), 2317193326Sed diag::err_reference_init_drops_quals) 2318193326Sed << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2319193326Sed << T2 << Init->getSourceRange(); 2320193326Sed return true; 2321193326Sed } 2322193326Sed 2323193326Sed // If at least one of the types is a class type, the types are not 2324193326Sed // related, and we aren't allowed any user conversions, the 2325193326Sed // reference binding fails. This case is important for breaking 2326193326Sed // recursion, since TryImplicitConversion below will attempt to 2327193326Sed // create a temporary through the use of a copy constructor. 2328193326Sed if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2329193326Sed (T1->isRecordType() || T2->isRecordType())) { 2330193326Sed if (!ICS) 2331193326Sed Diag(Init->getSourceRange().getBegin(), 2332193326Sed diag::err_typecheck_convert_incompatible) 2333193326Sed << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2334193326Sed return true; 2335193326Sed } 2336193326Sed 2337193326Sed // Actually try to convert the initializer to T1. 2338193326Sed if (ICS) { 2339193326Sed // C++ [over.ics.ref]p2: 2340193326Sed // 2341193326Sed // When a parameter of reference type is not bound directly to 2342193326Sed // an argument expression, the conversion sequence is the one 2343193326Sed // required to convert the argument expression to the 2344193326Sed // underlying type of the reference according to 2345193326Sed // 13.3.3.1. Conceptually, this conversion sequence corresponds 2346193326Sed // to copy-initializing a temporary of the underlying type with 2347193326Sed // the argument expression. Any difference in top-level 2348193326Sed // cv-qualification is subsumed by the initialization itself 2349193326Sed // and does not constitute a conversion. 2350193326Sed *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2351193326Sed // Of course, that's still a reference binding. 2352193326Sed if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2353193326Sed ICS->Standard.ReferenceBinding = true; 2354193326Sed ICS->Standard.RRefBinding = isRValRef; 2355193326Sed } else if(ICS->ConversionKind == 2356193326Sed ImplicitConversionSequence::UserDefinedConversion) { 2357193326Sed ICS->UserDefined.After.ReferenceBinding = true; 2358193326Sed ICS->UserDefined.After.RRefBinding = isRValRef; 2359193326Sed } 2360193326Sed return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2361193326Sed } else { 2362193326Sed return PerformImplicitConversion(Init, T1, "initializing"); 2363193326Sed } 2364193326Sed} 2365193326Sed 2366193326Sed/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2367193326Sed/// of this overloaded operator is well-formed. If so, returns false; 2368193326Sed/// otherwise, emits appropriate diagnostics and returns true. 2369193326Sedbool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2370193326Sed assert(FnDecl && FnDecl->isOverloadedOperator() && 2371193326Sed "Expected an overloaded operator declaration"); 2372193326Sed 2373193326Sed OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2374193326Sed 2375193326Sed // C++ [over.oper]p5: 2376193326Sed // The allocation and deallocation functions, operator new, 2377193326Sed // operator new[], operator delete and operator delete[], are 2378193326Sed // described completely in 3.7.3. The attributes and restrictions 2379193326Sed // found in the rest of this subclause do not apply to them unless 2380193326Sed // explicitly stated in 3.7.3. 2381193326Sed // FIXME: Write a separate routine for checking this. For now, just allow it. 2382193326Sed if (Op == OO_New || Op == OO_Array_New || 2383193326Sed Op == OO_Delete || Op == OO_Array_Delete) 2384193326Sed return false; 2385193326Sed 2386193326Sed // C++ [over.oper]p6: 2387193326Sed // An operator function shall either be a non-static member 2388193326Sed // function or be a non-member function and have at least one 2389193326Sed // parameter whose type is a class, a reference to a class, an 2390193326Sed // enumeration, or a reference to an enumeration. 2391193326Sed if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2392193326Sed if (MethodDecl->isStatic()) 2393193326Sed return Diag(FnDecl->getLocation(), 2394193326Sed diag::err_operator_overload_static) << FnDecl->getDeclName(); 2395193326Sed } else { 2396193326Sed bool ClassOrEnumParam = false; 2397193326Sed for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2398193326Sed ParamEnd = FnDecl->param_end(); 2399193326Sed Param != ParamEnd; ++Param) { 2400193326Sed QualType ParamType = (*Param)->getType().getNonReferenceType(); 2401193326Sed if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2402193326Sed ClassOrEnumParam = true; 2403193326Sed break; 2404193326Sed } 2405193326Sed } 2406193326Sed 2407193326Sed if (!ClassOrEnumParam) 2408193326Sed return Diag(FnDecl->getLocation(), 2409193326Sed diag::err_operator_overload_needs_class_or_enum) 2410193326Sed << FnDecl->getDeclName(); 2411193326Sed } 2412193326Sed 2413193326Sed // C++ [over.oper]p8: 2414193326Sed // An operator function cannot have default arguments (8.3.6), 2415193326Sed // except where explicitly stated below. 2416193326Sed // 2417193326Sed // Only the function-call operator allows default arguments 2418193326Sed // (C++ [over.call]p1). 2419193326Sed if (Op != OO_Call) { 2420193326Sed for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2421193326Sed Param != FnDecl->param_end(); ++Param) { 2422193326Sed if ((*Param)->hasUnparsedDefaultArg()) 2423193326Sed return Diag((*Param)->getLocation(), 2424193326Sed diag::err_operator_overload_default_arg) 2425193326Sed << FnDecl->getDeclName(); 2426193326Sed else if (Expr *DefArg = (*Param)->getDefaultArg()) 2427193326Sed return Diag((*Param)->getLocation(), 2428193326Sed diag::err_operator_overload_default_arg) 2429193326Sed << FnDecl->getDeclName() << DefArg->getSourceRange(); 2430193326Sed } 2431193326Sed } 2432193326Sed 2433193326Sed static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2434193326Sed { false, false, false } 2435193326Sed#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2436193326Sed , { Unary, Binary, MemberOnly } 2437193326Sed#include "clang/Basic/OperatorKinds.def" 2438193326Sed }; 2439193326Sed 2440193326Sed bool CanBeUnaryOperator = OperatorUses[Op][0]; 2441193326Sed bool CanBeBinaryOperator = OperatorUses[Op][1]; 2442193326Sed bool MustBeMemberOperator = OperatorUses[Op][2]; 2443193326Sed 2444193326Sed // C++ [over.oper]p8: 2445193326Sed // [...] Operator functions cannot have more or fewer parameters 2446193326Sed // than the number required for the corresponding operator, as 2447193326Sed // described in the rest of this subclause. 2448193326Sed unsigned NumParams = FnDecl->getNumParams() 2449193326Sed + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2450193326Sed if (Op != OO_Call && 2451193326Sed ((NumParams == 1 && !CanBeUnaryOperator) || 2452193326Sed (NumParams == 2 && !CanBeBinaryOperator) || 2453193326Sed (NumParams < 1) || (NumParams > 2))) { 2454193326Sed // We have the wrong number of parameters. 2455193326Sed unsigned ErrorKind; 2456193326Sed if (CanBeUnaryOperator && CanBeBinaryOperator) { 2457193326Sed ErrorKind = 2; // 2 -> unary or binary. 2458193326Sed } else if (CanBeUnaryOperator) { 2459193326Sed ErrorKind = 0; // 0 -> unary 2460193326Sed } else { 2461193326Sed assert(CanBeBinaryOperator && 2462193326Sed "All non-call overloaded operators are unary or binary!"); 2463193326Sed ErrorKind = 1; // 1 -> binary 2464193326Sed } 2465193326Sed 2466193326Sed return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2467193326Sed << FnDecl->getDeclName() << NumParams << ErrorKind; 2468193326Sed } 2469193326Sed 2470193326Sed // Overloaded operators other than operator() cannot be variadic. 2471193326Sed if (Op != OO_Call && 2472193326Sed FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2473193326Sed return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2474193326Sed << FnDecl->getDeclName(); 2475193326Sed } 2476193326Sed 2477193326Sed // Some operators must be non-static member functions. 2478193326Sed if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2479193326Sed return Diag(FnDecl->getLocation(), 2480193326Sed diag::err_operator_overload_must_be_member) 2481193326Sed << FnDecl->getDeclName(); 2482193326Sed } 2483193326Sed 2484193326Sed // C++ [over.inc]p1: 2485193326Sed // The user-defined function called operator++ implements the 2486193326Sed // prefix and postfix ++ operator. If this function is a member 2487193326Sed // function with no parameters, or a non-member function with one 2488193326Sed // parameter of class or enumeration type, it defines the prefix 2489193326Sed // increment operator ++ for objects of that type. If the function 2490193326Sed // is a member function with one parameter (which shall be of type 2491193326Sed // int) or a non-member function with two parameters (the second 2492193326Sed // of which shall be of type int), it defines the postfix 2493193326Sed // increment operator ++ for objects of that type. 2494193326Sed if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2495193326Sed ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2496193326Sed bool ParamIsInt = false; 2497193326Sed if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2498193326Sed ParamIsInt = BT->getKind() == BuiltinType::Int; 2499193326Sed 2500193326Sed if (!ParamIsInt) 2501193326Sed return Diag(LastParam->getLocation(), 2502193326Sed diag::err_operator_overload_post_incdec_must_be_int) 2503193326Sed << LastParam->getType() << (Op == OO_MinusMinus); 2504193326Sed } 2505193326Sed 2506193326Sed // Notify the class if it got an assignment operator. 2507193326Sed if (Op == OO_Equal) { 2508193326Sed // Would have returned earlier otherwise. 2509193326Sed assert(isa<CXXMethodDecl>(FnDecl) && 2510193326Sed "Overloaded = not member, but not filtered."); 2511193326Sed CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2512193326Sed Method->getParent()->addedAssignmentOperator(Context, Method); 2513193326Sed } 2514193326Sed 2515193326Sed return false; 2516193326Sed} 2517193326Sed 2518193326Sed/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2519193326Sed/// linkage specification, including the language and (if present) 2520193326Sed/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2521193326Sed/// the location of the language string literal, which is provided 2522193326Sed/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2523193326Sed/// the '{' brace. Otherwise, this linkage specification does not 2524193326Sed/// have any braces. 2525193326SedSema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 2526193326Sed SourceLocation ExternLoc, 2527193326Sed SourceLocation LangLoc, 2528193326Sed const char *Lang, 2529193326Sed unsigned StrSize, 2530193326Sed SourceLocation LBraceLoc) { 2531193326Sed LinkageSpecDecl::LanguageIDs Language; 2532193326Sed if (strncmp(Lang, "\"C\"", StrSize) == 0) 2533193326Sed Language = LinkageSpecDecl::lang_c; 2534193326Sed else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2535193326Sed Language = LinkageSpecDecl::lang_cxx; 2536193326Sed else { 2537193326Sed Diag(LangLoc, diag::err_bad_language); 2538193326Sed return DeclPtrTy(); 2539193326Sed } 2540193326Sed 2541193326Sed // FIXME: Add all the various semantics of linkage specifications 2542193326Sed 2543193326Sed LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2544193326Sed LangLoc, Language, 2545193326Sed LBraceLoc.isValid()); 2546193326Sed CurContext->addDecl(Context, D); 2547193326Sed PushDeclContext(S, D); 2548193326Sed return DeclPtrTy::make(D); 2549193326Sed} 2550193326Sed 2551193326Sed/// ActOnFinishLinkageSpecification - Completely the definition of 2552193326Sed/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2553193326Sed/// valid, it's the position of the closing '}' brace in a linkage 2554193326Sed/// specification that uses braces. 2555193326SedSema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 2556193326Sed DeclPtrTy LinkageSpec, 2557193326Sed SourceLocation RBraceLoc) { 2558193326Sed if (LinkageSpec) 2559193326Sed PopDeclContext(); 2560193326Sed return LinkageSpec; 2561193326Sed} 2562193326Sed 2563193326Sed/// \brief Perform semantic analysis for the variable declaration that 2564193326Sed/// occurs within a C++ catch clause, returning the newly-created 2565193326Sed/// variable. 2566193326SedVarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 2567193326Sed IdentifierInfo *Name, 2568193326Sed SourceLocation Loc, 2569193326Sed SourceRange Range) { 2570193326Sed bool Invalid = false; 2571193326Sed 2572193326Sed // Arrays and functions decay. 2573193326Sed if (ExDeclType->isArrayType()) 2574193326Sed ExDeclType = Context.getArrayDecayedType(ExDeclType); 2575193326Sed else if (ExDeclType->isFunctionType()) 2576193326Sed ExDeclType = Context.getPointerType(ExDeclType); 2577193326Sed 2578193326Sed // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2579193326Sed // The exception-declaration shall not denote a pointer or reference to an 2580193326Sed // incomplete type, other than [cv] void*. 2581193326Sed // N2844 forbids rvalue references. 2582193326Sed if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 2583193326Sed Diag(Loc, diag::err_catch_rvalue_ref) << Range; 2584193326Sed Invalid = true; 2585193326Sed } 2586193326Sed 2587193326Sed QualType BaseType = ExDeclType; 2588193326Sed int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2589193326Sed unsigned DK = diag::err_catch_incomplete; 2590193326Sed if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2591193326Sed BaseType = Ptr->getPointeeType(); 2592193326Sed Mode = 1; 2593193326Sed DK = diag::err_catch_incomplete_ptr; 2594193326Sed } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2595193326Sed // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 2596193326Sed BaseType = Ref->getPointeeType(); 2597193326Sed Mode = 2; 2598193326Sed DK = diag::err_catch_incomplete_ref; 2599193326Sed } 2600193326Sed if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 2601193326Sed !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 2602193326Sed Invalid = true; 2603193326Sed 2604193326Sed if (!Invalid && !ExDeclType->isDependentType() && 2605193326Sed RequireNonAbstractType(Loc, ExDeclType, 2606193326Sed diag::err_abstract_type_in_decl, 2607193326Sed AbstractVariableType)) 2608193326Sed Invalid = true; 2609193326Sed 2610193326Sed // FIXME: Need to test for ability to copy-construct and destroy the 2611193326Sed // exception variable. 2612193326Sed 2613193326Sed // FIXME: Need to check for abstract classes. 2614193326Sed 2615193326Sed VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 2616193326Sed Name, ExDeclType, VarDecl::None, 2617193326Sed Range.getBegin()); 2618193326Sed 2619193326Sed if (Invalid) 2620193326Sed ExDecl->setInvalidDecl(); 2621193326Sed 2622193326Sed return ExDecl; 2623193326Sed} 2624193326Sed 2625193326Sed/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2626193326Sed/// handler. 2627193326SedSema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 2628193326Sed QualType ExDeclType = GetTypeForDeclarator(D, S); 2629193326Sed 2630193326Sed bool Invalid = D.isInvalidType(); 2631193326Sed IdentifierInfo *II = D.getIdentifier(); 2632193326Sed if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2633193326Sed // The scope should be freshly made just for us. There is just no way 2634193326Sed // it contains any previous declaration. 2635193326Sed assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 2636193326Sed if (PrevDecl->isTemplateParameter()) { 2637193326Sed // Maybe we will complain about the shadowed template parameter. 2638193326Sed DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2639193326Sed } 2640193326Sed } 2641193326Sed 2642193326Sed if (D.getCXXScopeSpec().isSet() && !Invalid) { 2643193326Sed Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2644193326Sed << D.getCXXScopeSpec().getRange(); 2645193326Sed Invalid = true; 2646193326Sed } 2647193326Sed 2648193326Sed VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 2649193326Sed D.getIdentifier(), 2650193326Sed D.getIdentifierLoc(), 2651193326Sed D.getDeclSpec().getSourceRange()); 2652193326Sed 2653193326Sed if (Invalid) 2654193326Sed ExDecl->setInvalidDecl(); 2655193326Sed 2656193326Sed // Add the exception declaration into this scope. 2657193326Sed if (II) 2658193326Sed PushOnScopeChains(ExDecl, S); 2659193326Sed else 2660193326Sed CurContext->addDecl(Context, ExDecl); 2661193326Sed 2662193326Sed ProcessDeclAttributes(ExDecl, D); 2663193326Sed return DeclPtrTy::make(ExDecl); 2664193326Sed} 2665193326Sed 2666193326SedSema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 2667193326Sed ExprArg assertexpr, 2668193326Sed ExprArg assertmessageexpr) { 2669193326Sed Expr *AssertExpr = (Expr *)assertexpr.get(); 2670193326Sed StringLiteral *AssertMessage = 2671193326Sed cast<StringLiteral>((Expr *)assertmessageexpr.get()); 2672193326Sed 2673193326Sed if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 2674193326Sed llvm::APSInt Value(32); 2675193326Sed if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 2676193326Sed Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 2677193326Sed AssertExpr->getSourceRange(); 2678193326Sed return DeclPtrTy(); 2679193326Sed } 2680193326Sed 2681193326Sed if (Value == 0) { 2682193326Sed std::string str(AssertMessage->getStrData(), 2683193326Sed AssertMessage->getByteLength()); 2684193326Sed Diag(AssertLoc, diag::err_static_assert_failed) 2685193326Sed << str << AssertExpr->getSourceRange(); 2686193326Sed } 2687193326Sed } 2688193326Sed 2689193326Sed assertexpr.release(); 2690193326Sed assertmessageexpr.release(); 2691193326Sed Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 2692193326Sed AssertExpr, AssertMessage); 2693193326Sed 2694193326Sed CurContext->addDecl(Context, Decl); 2695193326Sed return DeclPtrTy::make(Decl); 2696193326Sed} 2697193326Sed 2698193326Sedbool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 2699193326Sed if (!(S->getFlags() & Scope::ClassScope)) { 2700193326Sed Diag(FriendLoc, diag::err_friend_decl_outside_class); 2701193326Sed return true; 2702193326Sed } 2703193326Sed 2704193326Sed return false; 2705193326Sed} 2706193326Sed 2707193326Sedvoid Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 2708193326Sed Decl *Dcl = dcl.getAs<Decl>(); 2709193326Sed FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 2710193326Sed if (!Fn) { 2711193326Sed Diag(DelLoc, diag::err_deleted_non_function); 2712193326Sed return; 2713193326Sed } 2714193326Sed if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 2715193326Sed Diag(DelLoc, diag::err_deleted_decl_not_first); 2716193326Sed Diag(Prev->getLocation(), diag::note_previous_declaration); 2717193326Sed // If the declaration wasn't the first, we delete the function anyway for 2718193326Sed // recovery. 2719193326Sed } 2720193326Sed Fn->setDeleted(); 2721193326Sed} 2722193326Sed 2723193326Sedstatic void SearchForReturnInStmt(Sema &Self, Stmt *S) { 2724193326Sed for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 2725193326Sed ++CI) { 2726193326Sed Stmt *SubStmt = *CI; 2727193326Sed if (!SubStmt) 2728193326Sed continue; 2729193326Sed if (isa<ReturnStmt>(SubStmt)) 2730193326Sed Self.Diag(SubStmt->getSourceRange().getBegin(), 2731193326Sed diag::err_return_in_constructor_handler); 2732193326Sed if (!isa<Expr>(SubStmt)) 2733193326Sed SearchForReturnInStmt(Self, SubStmt); 2734193326Sed } 2735193326Sed} 2736193326Sed 2737193326Sedvoid Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 2738193326Sed for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 2739193326Sed CXXCatchStmt *Handler = TryBlock->getHandler(I); 2740193326Sed SearchForReturnInStmt(*this, Handler); 2741193326Sed } 2742193326Sed} 2743193326Sed 2744193326Sedbool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 2745193326Sed const CXXMethodDecl *Old) { 2746193326Sed QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 2747193326Sed QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 2748193326Sed 2749193326Sed QualType CNewTy = Context.getCanonicalType(NewTy); 2750193326Sed QualType COldTy = Context.getCanonicalType(OldTy); 2751193326Sed 2752193326Sed if (CNewTy == COldTy && 2753193326Sed CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 2754193326Sed return false; 2755193326Sed 2756193326Sed // Check if the return types are covariant 2757193326Sed QualType NewClassTy, OldClassTy; 2758193326Sed 2759193326Sed /// Both types must be pointers or references to classes. 2760193326Sed if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 2761193326Sed if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 2762193326Sed NewClassTy = NewPT->getPointeeType(); 2763193326Sed OldClassTy = OldPT->getPointeeType(); 2764193326Sed } 2765193326Sed } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 2766193326Sed if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 2767193326Sed NewClassTy = NewRT->getPointeeType(); 2768193326Sed OldClassTy = OldRT->getPointeeType(); 2769193326Sed } 2770193326Sed } 2771193326Sed 2772193326Sed // The return types aren't either both pointers or references to a class type. 2773193326Sed if (NewClassTy.isNull()) { 2774193326Sed Diag(New->getLocation(), 2775193326Sed diag::err_different_return_type_for_overriding_virtual_function) 2776193326Sed << New->getDeclName() << NewTy << OldTy; 2777193326Sed Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2778193326Sed 2779193326Sed return true; 2780193326Sed } 2781193326Sed 2782193326Sed if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 2783193326Sed // Check if the new class derives from the old class. 2784193326Sed if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 2785193326Sed Diag(New->getLocation(), 2786193326Sed diag::err_covariant_return_not_derived) 2787193326Sed << New->getDeclName() << NewTy << OldTy; 2788193326Sed Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2789193326Sed return true; 2790193326Sed } 2791193326Sed 2792193326Sed // Check if we the conversion from derived to base is valid. 2793193326Sed if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 2794193326Sed diag::err_covariant_return_inaccessible_base, 2795193326Sed diag::err_covariant_return_ambiguous_derived_to_base_conv, 2796193326Sed // FIXME: Should this point to the return type? 2797193326Sed New->getLocation(), SourceRange(), New->getDeclName())) { 2798193326Sed Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2799193326Sed return true; 2800193326Sed } 2801193326Sed } 2802193326Sed 2803193326Sed // The qualifiers of the return types must be the same. 2804193326Sed if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 2805193326Sed Diag(New->getLocation(), 2806193326Sed diag::err_covariant_return_type_different_qualifications) 2807193326Sed << New->getDeclName() << NewTy << OldTy; 2808193326Sed Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2809193326Sed return true; 2810193326Sed }; 2811193326Sed 2812193326Sed 2813193326Sed // The new class type must have the same or less qualifiers as the old type. 2814193326Sed if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 2815193326Sed Diag(New->getLocation(), 2816193326Sed diag::err_covariant_return_type_class_type_more_qualified) 2817193326Sed << New->getDeclName() << NewTy << OldTy; 2818193326Sed Diag(Old->getLocation(), diag::note_overridden_virtual_function); 2819193326Sed return true; 2820193326Sed }; 2821193326Sed 2822193326Sed return false; 2823193326Sed} 2824