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author | ed <ed@FreeBSD.org> | 2009-06-02 17:58:47 +0000 |
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committer | ed <ed@FreeBSD.org> | 2009-06-02 17:58:47 +0000 |
commit | f27e5a09a0d815b8a4814152954ff87dadfdefc0 (patch) | |
tree | ce7d964cbb5e39695b71481698f10cb099c23d4a /lib/Sema/SemaDeclCXX.cpp | |
download | FreeBSD-src-f27e5a09a0d815b8a4814152954ff87dadfdefc0.zip FreeBSD-src-f27e5a09a0d815b8a4814152954ff87dadfdefc0.tar.gz |
Import Clang, at r72732.
Diffstat (limited to 'lib/Sema/SemaDeclCXX.cpp')
-rw-r--r-- | lib/Sema/SemaDeclCXX.cpp | 2823 |
1 files changed, 2823 insertions, 0 deletions
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp new file mode 100644 index 0000000..f13179f --- /dev/null +++ b/lib/Sema/SemaDeclCXX.cpp @@ -0,0 +1,2823 @@ +//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements semantic analysis for C++ declarations. +// +//===----------------------------------------------------------------------===// + +#include "Sema.h" +#include "SemaInherit.h" +#include "clang/AST/ASTConsumer.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclVisitor.h" +#include "clang/AST/TypeOrdering.h" +#include "clang/AST/StmtVisitor.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Parse/DeclSpec.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/Support/Compiler.h" +#include <algorithm> // for std::equal +#include <map> + +using namespace clang; + +//===----------------------------------------------------------------------===// +// CheckDefaultArgumentVisitor +//===----------------------------------------------------------------------===// + +namespace { + /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses + /// the default argument of a parameter to determine whether it + /// contains any ill-formed subexpressions. For example, this will + /// diagnose the use of local variables or parameters within the + /// default argument expression. + class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor + : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { + Expr *DefaultArg; + Sema *S; + + public: + CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) + : DefaultArg(defarg), S(s) {} + + bool VisitExpr(Expr *Node); + bool VisitDeclRefExpr(DeclRefExpr *DRE); + bool VisitCXXThisExpr(CXXThisExpr *ThisE); + }; + + /// VisitExpr - Visit all of the children of this expression. + bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { + bool IsInvalid = false; + for (Stmt::child_iterator I = Node->child_begin(), + E = Node->child_end(); I != E; ++I) + IsInvalid |= Visit(*I); + return IsInvalid; + } + + /// VisitDeclRefExpr - Visit a reference to a declaration, to + /// determine whether this declaration can be used in the default + /// argument expression. + bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { + NamedDecl *Decl = DRE->getDecl(); + if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { + // C++ [dcl.fct.default]p9 + // Default arguments are evaluated each time the function is + // called. The order of evaluation of function arguments is + // unspecified. Consequently, parameters of a function shall not + // be used in default argument expressions, even if they are not + // evaluated. Parameters of a function declared before a default + // argument expression are in scope and can hide namespace and + // class member names. + return S->Diag(DRE->getSourceRange().getBegin(), + diag::err_param_default_argument_references_param) + << Param->getDeclName() << DefaultArg->getSourceRange(); + } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { + // C++ [dcl.fct.default]p7 + // Local variables shall not be used in default argument + // expressions. + if (VDecl->isBlockVarDecl()) + return S->Diag(DRE->getSourceRange().getBegin(), + diag::err_param_default_argument_references_local) + << VDecl->getDeclName() << DefaultArg->getSourceRange(); + } + + return false; + } + + /// VisitCXXThisExpr - Visit a C++ "this" expression. + bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { + // C++ [dcl.fct.default]p8: + // The keyword this shall not be used in a default argument of a + // member function. + return S->Diag(ThisE->getSourceRange().getBegin(), + diag::err_param_default_argument_references_this) + << ThisE->getSourceRange(); + } +} + +/// ActOnParamDefaultArgument - Check whether the default argument +/// provided for a function parameter is well-formed. If so, attach it +/// to the parameter declaration. +void +Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, + ExprArg defarg) { + ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); + ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); + QualType ParamType = Param->getType(); + + // Default arguments are only permitted in C++ + if (!getLangOptions().CPlusPlus) { + Diag(EqualLoc, diag::err_param_default_argument) + << DefaultArg->getSourceRange(); + Param->setInvalidDecl(); + return; + } + + // C++ [dcl.fct.default]p5 + // A default argument expression is implicitly converted (clause + // 4) to the parameter type. The default argument expression has + // the same semantic constraints as the initializer expression in + // a declaration of a variable of the parameter type, using the + // copy-initialization semantics (8.5). + Expr *DefaultArgPtr = DefaultArg.get(); + bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, + EqualLoc, + Param->getDeclName(), + /*DirectInit=*/false); + if (DefaultArgPtr != DefaultArg.get()) { + DefaultArg.take(); + DefaultArg.reset(DefaultArgPtr); + } + if (DefaultInitFailed) { + return; + } + + // Check that the default argument is well-formed + CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); + if (DefaultArgChecker.Visit(DefaultArg.get())) { + Param->setInvalidDecl(); + return; + } + + // Okay: add the default argument to the parameter + Param->setDefaultArg(DefaultArg.take()); +} + +/// ActOnParamUnparsedDefaultArgument - We've seen a default +/// argument for a function parameter, but we can't parse it yet +/// because we're inside a class definition. Note that this default +/// argument will be parsed later. +void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, + SourceLocation EqualLoc) { + ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); + if (Param) + Param->setUnparsedDefaultArg(); +} + +/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of +/// the default argument for the parameter param failed. +void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { + cast<ParmVarDecl>(param.getAs<Decl>())->setInvalidDecl(); +} + +/// CheckExtraCXXDefaultArguments - Check for any extra default +/// arguments in the declarator, which is not a function declaration +/// or definition and therefore is not permitted to have default +/// arguments. This routine should be invoked for every declarator +/// that is not a function declaration or definition. +void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { + // C++ [dcl.fct.default]p3 + // A default argument expression shall be specified only in the + // parameter-declaration-clause of a function declaration or in a + // template-parameter (14.1). It shall not be specified for a + // parameter pack. If it is specified in a + // parameter-declaration-clause, it shall not occur within a + // declarator or abstract-declarator of a parameter-declaration. + for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { + DeclaratorChunk &chunk = D.getTypeObject(i); + if (chunk.Kind == DeclaratorChunk::Function) { + for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { + ParmVarDecl *Param = + cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); + if (Param->hasUnparsedDefaultArg()) { + CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; + Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) + << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); + delete Toks; + chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; + } else if (Param->getDefaultArg()) { + Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) + << Param->getDefaultArg()->getSourceRange(); + Param->setDefaultArg(0); + } + } + } + } +} + +// MergeCXXFunctionDecl - Merge two declarations of the same C++ +// function, once we already know that they have the same +// type. Subroutine of MergeFunctionDecl. Returns true if there was an +// error, false otherwise. +bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { + bool Invalid = false; + + // C++ [dcl.fct.default]p4: + // + // For non-template functions, default arguments can be added in + // later declarations of a function in the same + // scope. Declarations in different scopes have completely + // distinct sets of default arguments. That is, declarations in + // inner scopes do not acquire default arguments from + // declarations in outer scopes, and vice versa. In a given + // function declaration, all parameters subsequent to a + // parameter with a default argument shall have default + // arguments supplied in this or previous declarations. A + // default argument shall not be redefined by a later + // declaration (not even to the same value). + for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { + ParmVarDecl *OldParam = Old->getParamDecl(p); + ParmVarDecl *NewParam = New->getParamDecl(p); + + if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { + Diag(NewParam->getLocation(), + diag::err_param_default_argument_redefinition) + << NewParam->getDefaultArg()->getSourceRange(); + Diag(OldParam->getLocation(), diag::note_previous_definition); + Invalid = true; + } else if (OldParam->getDefaultArg()) { + // Merge the old default argument into the new parameter + NewParam->setDefaultArg(OldParam->getDefaultArg()); + } + } + + return Invalid; +} + +/// CheckCXXDefaultArguments - Verify that the default arguments for a +/// function declaration are well-formed according to C++ +/// [dcl.fct.default]. +void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { + unsigned NumParams = FD->getNumParams(); + unsigned p; + + // Find first parameter with a default argument + for (p = 0; p < NumParams; ++p) { + ParmVarDecl *Param = FD->getParamDecl(p); + if (Param->getDefaultArg()) + break; + } + + // C++ [dcl.fct.default]p4: + // In a given function declaration, all parameters + // subsequent to a parameter with a default argument shall + // have default arguments supplied in this or previous + // declarations. A default argument shall not be redefined + // by a later declaration (not even to the same value). + unsigned LastMissingDefaultArg = 0; + for(; p < NumParams; ++p) { + ParmVarDecl *Param = FD->getParamDecl(p); + if (!Param->getDefaultArg()) { + if (Param->isInvalidDecl()) + /* We already complained about this parameter. */; + else if (Param->getIdentifier()) + Diag(Param->getLocation(), + diag::err_param_default_argument_missing_name) + << Param->getIdentifier(); + else + Diag(Param->getLocation(), + diag::err_param_default_argument_missing); + + LastMissingDefaultArg = p; + } + } + + if (LastMissingDefaultArg > 0) { + // Some default arguments were missing. Clear out all of the + // default arguments up to (and including) the last missing + // default argument, so that we leave the function parameters + // in a semantically valid state. + for (p = 0; p <= LastMissingDefaultArg; ++p) { + ParmVarDecl *Param = FD->getParamDecl(p); + if (Param->getDefaultArg()) { + if (!Param->hasUnparsedDefaultArg()) + Param->getDefaultArg()->Destroy(Context); + Param->setDefaultArg(0); + } + } + } +} + +/// isCurrentClassName - Determine whether the identifier II is the +/// name of the class type currently being defined. In the case of +/// nested classes, this will only return true if II is the name of +/// the innermost class. +bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, + const CXXScopeSpec *SS) { + CXXRecordDecl *CurDecl; + if (SS && SS->isSet() && !SS->isInvalid()) { + DeclContext *DC = computeDeclContext(*SS); + CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); + } else + CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); + + if (CurDecl) + return &II == CurDecl->getIdentifier(); + else + return false; +} + +/// \brief Check the validity of a C++ base class specifier. +/// +/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics +/// and returns NULL otherwise. +CXXBaseSpecifier * +Sema::CheckBaseSpecifier(CXXRecordDecl *Class, + SourceRange SpecifierRange, + bool Virtual, AccessSpecifier Access, + QualType BaseType, + SourceLocation BaseLoc) { + // C++ [class.union]p1: + // A union shall not have base classes. + if (Class->isUnion()) { + Diag(Class->getLocation(), diag::err_base_clause_on_union) + << SpecifierRange; + return 0; + } + + if (BaseType->isDependentType()) + return new CXXBaseSpecifier(SpecifierRange, Virtual, + Class->getTagKind() == RecordDecl::TK_class, + Access, BaseType); + + // Base specifiers must be record types. + if (!BaseType->isRecordType()) { + Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; + return 0; + } + + // C++ [class.union]p1: + // A union shall not be used as a base class. + if (BaseType->isUnionType()) { + Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; + return 0; + } + + // C++ [class.derived]p2: + // The class-name in a base-specifier shall not be an incompletely + // defined class. + if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, + SpecifierRange)) + return 0; + + // If the base class is polymorphic, the new one is, too. + RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); + assert(BaseDecl && "Record type has no declaration"); + BaseDecl = BaseDecl->getDefinition(Context); + assert(BaseDecl && "Base type is not incomplete, but has no definition"); + if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) + Class->setPolymorphic(true); + + // C++ [dcl.init.aggr]p1: + // An aggregate is [...] a class with [...] no base classes [...]. + Class->setAggregate(false); + Class->setPOD(false); + + if (Virtual) { + // C++ [class.ctor]p5: + // A constructor is trivial if its class has no virtual base classes. + Class->setHasTrivialConstructor(false); + } else { + // C++ [class.ctor]p5: + // A constructor is trivial if all the direct base classes of its + // class have trivial constructors. + Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> + hasTrivialConstructor()); + } + + // C++ [class.ctor]p3: + // A destructor is trivial if all the direct base classes of its class + // have trivial destructors. + Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> + hasTrivialDestructor()); + + // Create the base specifier. + // FIXME: Allocate via ASTContext? + return new CXXBaseSpecifier(SpecifierRange, Virtual, + Class->getTagKind() == RecordDecl::TK_class, + Access, BaseType); +} + +/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is +/// one entry in the base class list of a class specifier, for +/// example: +/// class foo : public bar, virtual private baz { +/// 'public bar' and 'virtual private baz' are each base-specifiers. +Sema::BaseResult +Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, + bool Virtual, AccessSpecifier Access, + TypeTy *basetype, SourceLocation BaseLoc) { + AdjustDeclIfTemplate(classdecl); + CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); + QualType BaseType = QualType::getFromOpaquePtr(basetype); + if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, + Virtual, Access, + BaseType, BaseLoc)) + return BaseSpec; + + return true; +} + +/// \brief Performs the actual work of attaching the given base class +/// specifiers to a C++ class. +bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, + unsigned NumBases) { + if (NumBases == 0) + return false; + + // Used to keep track of which base types we have already seen, so + // that we can properly diagnose redundant direct base types. Note + // that the key is always the unqualified canonical type of the base + // class. + std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; + + // Copy non-redundant base specifiers into permanent storage. + unsigned NumGoodBases = 0; + bool Invalid = false; + for (unsigned idx = 0; idx < NumBases; ++idx) { + QualType NewBaseType + = Context.getCanonicalType(Bases[idx]->getType()); + NewBaseType = NewBaseType.getUnqualifiedType(); + + if (KnownBaseTypes[NewBaseType]) { + // C++ [class.mi]p3: + // A class shall not be specified as a direct base class of a + // derived class more than once. + Diag(Bases[idx]->getSourceRange().getBegin(), + diag::err_duplicate_base_class) + << KnownBaseTypes[NewBaseType]->getType() + << Bases[idx]->getSourceRange(); + + // Delete the duplicate base class specifier; we're going to + // overwrite its pointer later. + delete Bases[idx]; + + Invalid = true; + } else { + // Okay, add this new base class. + KnownBaseTypes[NewBaseType] = Bases[idx]; + Bases[NumGoodBases++] = Bases[idx]; + } + } + + // Attach the remaining base class specifiers to the derived class. + Class->setBases(Bases, NumGoodBases); + + // Delete the remaining (good) base class specifiers, since their + // data has been copied into the CXXRecordDecl. + for (unsigned idx = 0; idx < NumGoodBases; ++idx) + delete Bases[idx]; + + return Invalid; +} + +/// ActOnBaseSpecifiers - Attach the given base specifiers to the +/// class, after checking whether there are any duplicate base +/// classes. +void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, + unsigned NumBases) { + if (!ClassDecl || !Bases || !NumBases) + return; + + AdjustDeclIfTemplate(ClassDecl); + AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), + (CXXBaseSpecifier**)(Bases), NumBases); +} + +//===----------------------------------------------------------------------===// +// C++ class member Handling +//===----------------------------------------------------------------------===// + +/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member +/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the +/// bitfield width if there is one and 'InitExpr' specifies the initializer if +/// any. +Sema::DeclPtrTy +Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, + ExprTy *BW, ExprTy *InitExpr, bool Deleted) { + const DeclSpec &DS = D.getDeclSpec(); + DeclarationName Name = GetNameForDeclarator(D); + Expr *BitWidth = static_cast<Expr*>(BW); + Expr *Init = static_cast<Expr*>(InitExpr); + SourceLocation Loc = D.getIdentifierLoc(); + + bool isFunc = D.isFunctionDeclarator(); + + // C++ 9.2p6: A member shall not be declared to have automatic storage + // duration (auto, register) or with the extern storage-class-specifier. + // C++ 7.1.1p8: The mutable specifier can be applied only to names of class + // data members and cannot be applied to names declared const or static, + // and cannot be applied to reference members. + switch (DS.getStorageClassSpec()) { + case DeclSpec::SCS_unspecified: + case DeclSpec::SCS_typedef: + case DeclSpec::SCS_static: + // FALL THROUGH. + break; + case DeclSpec::SCS_mutable: + if (isFunc) { + if (DS.getStorageClassSpecLoc().isValid()) + Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); + else + Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); + + // FIXME: It would be nicer if the keyword was ignored only for this + // declarator. Otherwise we could get follow-up errors. + D.getMutableDeclSpec().ClearStorageClassSpecs(); + } else { + QualType T = GetTypeForDeclarator(D, S); + diag::kind err = static_cast<diag::kind>(0); + if (T->isReferenceType()) + err = diag::err_mutable_reference; + else if (T.isConstQualified()) + err = diag::err_mutable_const; + if (err != 0) { + if (DS.getStorageClassSpecLoc().isValid()) + Diag(DS.getStorageClassSpecLoc(), err); + else + Diag(DS.getThreadSpecLoc(), err); + // FIXME: It would be nicer if the keyword was ignored only for this + // declarator. Otherwise we could get follow-up errors. + D.getMutableDeclSpec().ClearStorageClassSpecs(); + } + } + break; + default: + if (DS.getStorageClassSpecLoc().isValid()) + Diag(DS.getStorageClassSpecLoc(), + diag::err_storageclass_invalid_for_member); + else + Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); + D.getMutableDeclSpec().ClearStorageClassSpecs(); + } + + if (!isFunc && + D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && + D.getNumTypeObjects() == 0) { + // Check also for this case: + // + // typedef int f(); + // f a; + // + QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); + isFunc = TDType->isFunctionType(); + } + + bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || + DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && + !isFunc); + + Decl *Member; + if (isInstField) { + Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, + AS); + assert(Member && "HandleField never returns null"); + } else { + Member = ActOnDeclarator(S, D).getAs<Decl>(); + if (!Member) { + if (BitWidth) DeleteExpr(BitWidth); + return DeclPtrTy(); + } + + // Non-instance-fields can't have a bitfield. + if (BitWidth) { + if (Member->isInvalidDecl()) { + // don't emit another diagnostic. + } else if (isa<VarDecl>(Member)) { + // C++ 9.6p3: A bit-field shall not be a static member. + // "static member 'A' cannot be a bit-field" + Diag(Loc, diag::err_static_not_bitfield) + << Name << BitWidth->getSourceRange(); + } else if (isa<TypedefDecl>(Member)) { + // "typedef member 'x' cannot be a bit-field" + Diag(Loc, diag::err_typedef_not_bitfield) + << Name << BitWidth->getSourceRange(); + } else { + // A function typedef ("typedef int f(); f a;"). + // C++ 9.6p3: A bit-field shall have integral or enumeration type. + Diag(Loc, diag::err_not_integral_type_bitfield) + << Name << cast<ValueDecl>(Member)->getType() + << BitWidth->getSourceRange(); + } + + DeleteExpr(BitWidth); + BitWidth = 0; + Member->setInvalidDecl(); + } + + Member->setAccess(AS); + } + + assert((Name || isInstField) && "No identifier for non-field ?"); + + if (Init) + AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); + if (Deleted) // FIXME: Source location is not very good. + SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); + + if (isInstField) { + FieldCollector->Add(cast<FieldDecl>(Member)); + return DeclPtrTy(); + } + return DeclPtrTy::make(Member); +} + +/// ActOnMemInitializer - Handle a C++ member initializer. +Sema::MemInitResult +Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, + Scope *S, + IdentifierInfo *MemberOrBase, + SourceLocation IdLoc, + SourceLocation LParenLoc, + ExprTy **Args, unsigned NumArgs, + SourceLocation *CommaLocs, + SourceLocation RParenLoc) { + CXXConstructorDecl *Constructor + = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); + if (!Constructor) { + // The user wrote a constructor initializer on a function that is + // not a C++ constructor. Ignore the error for now, because we may + // have more member initializers coming; we'll diagnose it just + // once in ActOnMemInitializers. + return true; + } + + CXXRecordDecl *ClassDecl = Constructor->getParent(); + + // C++ [class.base.init]p2: + // Names in a mem-initializer-id are looked up in the scope of the + // constructor’s class and, if not found in that scope, are looked + // up in the scope containing the constructor’s + // definition. [Note: if the constructor’s class contains a member + // with the same name as a direct or virtual base class of the + // class, a mem-initializer-id naming the member or base class and + // composed of a single identifier refers to the class member. A + // mem-initializer-id for the hidden base class may be specified + // using a qualified name. ] + // Look for a member, first. + FieldDecl *Member = 0; + DeclContext::lookup_result Result + = ClassDecl->lookup(Context, MemberOrBase); + if (Result.first != Result.second) + Member = dyn_cast<FieldDecl>(*Result.first); + + // FIXME: Handle members of an anonymous union. + + if (Member) { + // FIXME: Perform direct initialization of the member. + return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); + } + + // It didn't name a member, so see if it names a class. + TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); + if (!BaseTy) + return Diag(IdLoc, diag::err_mem_init_not_member_or_class) + << MemberOrBase << SourceRange(IdLoc, RParenLoc); + + QualType BaseType = QualType::getFromOpaquePtr(BaseTy); + if (!BaseType->isRecordType()) + return Diag(IdLoc, diag::err_base_init_does_not_name_class) + << BaseType << SourceRange(IdLoc, RParenLoc); + + // C++ [class.base.init]p2: + // [...] Unless the mem-initializer-id names a nonstatic data + // member of the constructor’s class or a direct or virtual base + // of that class, the mem-initializer is ill-formed. A + // mem-initializer-list can initialize a base class using any + // name that denotes that base class type. + + // First, check for a direct base class. + const CXXBaseSpecifier *DirectBaseSpec = 0; + for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); + Base != ClassDecl->bases_end(); ++Base) { + if (Context.getCanonicalType(BaseType).getUnqualifiedType() == + Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { + // We found a direct base of this type. That's what we're + // initializing. + DirectBaseSpec = &*Base; + break; + } + } + + // Check for a virtual base class. + // FIXME: We might be able to short-circuit this if we know in advance that + // there are no virtual bases. + const CXXBaseSpecifier *VirtualBaseSpec = 0; + if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { + // We haven't found a base yet; search the class hierarchy for a + // virtual base class. + BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, + /*DetectVirtual=*/false); + if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { + for (BasePaths::paths_iterator Path = Paths.begin(); + Path != Paths.end(); ++Path) { + if (Path->back().Base->isVirtual()) { + VirtualBaseSpec = Path->back().Base; + break; + } + } + } + } + + // C++ [base.class.init]p2: + // If a mem-initializer-id is ambiguous because it designates both + // a direct non-virtual base class and an inherited virtual base + // class, the mem-initializer is ill-formed. + if (DirectBaseSpec && VirtualBaseSpec) + return Diag(IdLoc, diag::err_base_init_direct_and_virtual) + << MemberOrBase << SourceRange(IdLoc, RParenLoc); + + return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); +} + +void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, + SourceLocation ColonLoc, + MemInitTy **MemInits, unsigned NumMemInits) { + CXXConstructorDecl *Constructor = + dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); + + if (!Constructor) { + Diag(ColonLoc, diag::err_only_constructors_take_base_inits); + return; + } +} + +namespace { + /// PureVirtualMethodCollector - traverses a class and its superclasses + /// and determines if it has any pure virtual methods. + class VISIBILITY_HIDDEN PureVirtualMethodCollector { + ASTContext &Context; + + public: + typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; + + private: + MethodList Methods; + + void Collect(const CXXRecordDecl* RD, MethodList& Methods); + + public: + PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) + : Context(Ctx) { + + MethodList List; + Collect(RD, List); + + // Copy the temporary list to methods, and make sure to ignore any + // null entries. + for (size_t i = 0, e = List.size(); i != e; ++i) { + if (List[i]) + Methods.push_back(List[i]); + } + } + + bool empty() const { return Methods.empty(); } + + MethodList::const_iterator methods_begin() { return Methods.begin(); } + MethodList::const_iterator methods_end() { return Methods.end(); } + }; + + void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, + MethodList& Methods) { + // First, collect the pure virtual methods for the base classes. + for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), + BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { + if (const RecordType *RT = Base->getType()->getAsRecordType()) { + const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); + if (BaseDecl && BaseDecl->isAbstract()) + Collect(BaseDecl, Methods); + } + } + + // Next, zero out any pure virtual methods that this class overrides. + typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; + + MethodSetTy OverriddenMethods; + size_t MethodsSize = Methods.size(); + + for (RecordDecl::decl_iterator i = RD->decls_begin(Context), + e = RD->decls_end(Context); + i != e; ++i) { + // Traverse the record, looking for methods. + if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { + // If the method is pre virtual, add it to the methods vector. + if (MD->isPure()) { + Methods.push_back(MD); + continue; + } + + // Otherwise, record all the overridden methods in our set. + for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), + E = MD->end_overridden_methods(); I != E; ++I) { + // Keep track of the overridden methods. + OverriddenMethods.insert(*I); + } + } + } + + // Now go through the methods and zero out all the ones we know are + // overridden. + for (size_t i = 0, e = MethodsSize; i != e; ++i) { + if (OverriddenMethods.count(Methods[i])) + Methods[i] = 0; + } + + } +} + +bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, + unsigned DiagID, AbstractDiagSelID SelID, + const CXXRecordDecl *CurrentRD) { + + if (!getLangOptions().CPlusPlus) + return false; + + if (const ArrayType *AT = Context.getAsArrayType(T)) + return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, + CurrentRD); + + if (const PointerType *PT = T->getAsPointerType()) { + // Find the innermost pointer type. + while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) + PT = T; + + if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) + return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, + CurrentRD); + } + + const RecordType *RT = T->getAsRecordType(); + if (!RT) + return false; + + const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); + if (!RD) + return false; + + if (CurrentRD && CurrentRD != RD) + return false; + + if (!RD->isAbstract()) + return false; + + Diag(Loc, DiagID) << RD->getDeclName() << SelID; + + // Check if we've already emitted the list of pure virtual functions for this + // class. + if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) + return true; + + PureVirtualMethodCollector Collector(Context, RD); + + for (PureVirtualMethodCollector::MethodList::const_iterator I = + Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { + const CXXMethodDecl *MD = *I; + + Diag(MD->getLocation(), diag::note_pure_virtual_function) << + MD->getDeclName(); + } + + if (!PureVirtualClassDiagSet) + PureVirtualClassDiagSet.reset(new RecordDeclSetTy); + PureVirtualClassDiagSet->insert(RD); + + return true; +} + +namespace { + class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser + : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { + Sema &SemaRef; + CXXRecordDecl *AbstractClass; + + bool VisitDeclContext(const DeclContext *DC) { + bool Invalid = false; + + for (CXXRecordDecl::decl_iterator I = DC->decls_begin(SemaRef.Context), + E = DC->decls_end(SemaRef.Context); I != E; ++I) + Invalid |= Visit(*I); + + return Invalid; + } + + public: + AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) + : SemaRef(SemaRef), AbstractClass(ac) { + Visit(SemaRef.Context.getTranslationUnitDecl()); + } + + bool VisitFunctionDecl(const FunctionDecl *FD) { + if (FD->isThisDeclarationADefinition()) { + // No need to do the check if we're in a definition, because it requires + // that the return/param types are complete. + // because that requires + return VisitDeclContext(FD); + } + + // Check the return type. + QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); + bool Invalid = + SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, + diag::err_abstract_type_in_decl, + Sema::AbstractReturnType, + AbstractClass); + + for (FunctionDecl::param_const_iterator I = FD->param_begin(), + E = FD->param_end(); I != E; ++I) { + const ParmVarDecl *VD = *I; + Invalid |= + SemaRef.RequireNonAbstractType(VD->getLocation(), + VD->getOriginalType(), + diag::err_abstract_type_in_decl, + Sema::AbstractParamType, + AbstractClass); + } + + return Invalid; + } + + bool VisitDecl(const Decl* D) { + if (const DeclContext *DC = dyn_cast<DeclContext>(D)) + return VisitDeclContext(DC); + + return false; + } + }; +} + +void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, + DeclPtrTy TagDecl, + SourceLocation LBrac, + SourceLocation RBrac) { + AdjustDeclIfTemplate(TagDecl); + ActOnFields(S, RLoc, TagDecl, + (DeclPtrTy*)FieldCollector->getCurFields(), + FieldCollector->getCurNumFields(), LBrac, RBrac, 0); + + CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); + if (!RD->isAbstract()) { + // Collect all the pure virtual methods and see if this is an abstract + // class after all. + PureVirtualMethodCollector Collector(Context, RD); + if (!Collector.empty()) + RD->setAbstract(true); + } + + if (RD->isAbstract()) + AbstractClassUsageDiagnoser(*this, RD); + + if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { + for (RecordDecl::field_iterator i = RD->field_begin(Context), + e = RD->field_end(Context); i != e; ++i) { + // All the nonstatic data members must have trivial constructors. + QualType FTy = i->getType(); + while (const ArrayType *AT = Context.getAsArrayType(FTy)) + FTy = AT->getElementType(); + + if (const RecordType *RT = FTy->getAsRecordType()) { + CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); + + if (!FieldRD->hasTrivialConstructor()) + RD->setHasTrivialConstructor(false); + if (!FieldRD->hasTrivialDestructor()) + RD->setHasTrivialDestructor(false); + + // If RD has neither a trivial constructor nor a trivial destructor + // we don't need to continue checking. + if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) + break; + } + } + } + + if (!RD->isDependentType()) + AddImplicitlyDeclaredMembersToClass(RD); +} + +/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared +/// special functions, such as the default constructor, copy +/// constructor, or destructor, to the given C++ class (C++ +/// [special]p1). This routine can only be executed just before the +/// definition of the class is complete. +void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { + QualType ClassType = Context.getTypeDeclType(ClassDecl); + ClassType = Context.getCanonicalType(ClassType); + + // FIXME: Implicit declarations have exception specifications, which are + // the union of the specifications of the implicitly called functions. + + if (!ClassDecl->hasUserDeclaredConstructor()) { + // C++ [class.ctor]p5: + // A default constructor for a class X is a constructor of class X + // that can be called without an argument. If there is no + // user-declared constructor for class X, a default constructor is + // implicitly declared. An implicitly-declared default constructor + // is an inline public member of its class. + DeclarationName Name + = Context.DeclarationNames.getCXXConstructorName(ClassType); + CXXConstructorDecl *DefaultCon = + CXXConstructorDecl::Create(Context, ClassDecl, + ClassDecl->getLocation(), Name, + Context.getFunctionType(Context.VoidTy, + 0, 0, false, 0), + /*isExplicit=*/false, + /*isInline=*/true, + /*isImplicitlyDeclared=*/true); + DefaultCon->setAccess(AS_public); + DefaultCon->setImplicit(); + ClassDecl->addDecl(Context, DefaultCon); + + // Notify the class that we've added a constructor. + ClassDecl->addedConstructor(Context, DefaultCon); + } + + if (!ClassDecl->hasUserDeclaredCopyConstructor()) { + // C++ [class.copy]p4: + // If the class definition does not explicitly declare a copy + // constructor, one is declared implicitly. + + // C++ [class.copy]p5: + // The implicitly-declared copy constructor for a class X will + // have the form + // + // X::X(const X&) + // + // if + bool HasConstCopyConstructor = true; + + // -- each direct or virtual base class B of X has a copy + // constructor whose first parameter is of type const B& or + // const volatile B&, and + for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); + HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { + const CXXRecordDecl *BaseClassDecl + = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); + HasConstCopyConstructor + = BaseClassDecl->hasConstCopyConstructor(Context); + } + + // -- for all the nonstatic data members of X that are of a + // class type M (or array thereof), each such class type + // has a copy constructor whose first parameter is of type + // const M& or const volatile M&. + for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); + HasConstCopyConstructor && Field != ClassDecl->field_end(Context); + ++Field) { + QualType FieldType = (*Field)->getType(); + if (const ArrayType *Array = Context.getAsArrayType(FieldType)) + FieldType = Array->getElementType(); + if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { + const CXXRecordDecl *FieldClassDecl + = cast<CXXRecordDecl>(FieldClassType->getDecl()); + HasConstCopyConstructor + = FieldClassDecl->hasConstCopyConstructor(Context); + } + } + + // Otherwise, the implicitly declared copy constructor will have + // the form + // + // X::X(X&) + QualType ArgType = ClassType; + if (HasConstCopyConstructor) + ArgType = ArgType.withConst(); + ArgType = Context.getLValueReferenceType(ArgType); + + // An implicitly-declared copy constructor is an inline public + // member of its class. + DeclarationName Name + = Context.DeclarationNames.getCXXConstructorName(ClassType); + CXXConstructorDecl *CopyConstructor + = CXXConstructorDecl::Create(Context, ClassDecl, + ClassDecl->getLocation(), Name, + Context.getFunctionType(Context.VoidTy, + &ArgType, 1, + false, 0), + /*isExplicit=*/false, + /*isInline=*/true, + /*isImplicitlyDeclared=*/true); + CopyConstructor->setAccess(AS_public); + CopyConstructor->setImplicit(); + + // Add the parameter to the constructor. + ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, + ClassDecl->getLocation(), + /*IdentifierInfo=*/0, + ArgType, VarDecl::None, 0); + CopyConstructor->setParams(Context, &FromParam, 1); + + ClassDecl->addedConstructor(Context, CopyConstructor); + ClassDecl->addDecl(Context, CopyConstructor); + } + + if (!ClassDecl->hasUserDeclaredCopyAssignment()) { + // Note: The following rules are largely analoguous to the copy + // constructor rules. Note that virtual bases are not taken into account + // for determining the argument type of the operator. Note also that + // operators taking an object instead of a reference are allowed. + // + // C++ [class.copy]p10: + // If the class definition does not explicitly declare a copy + // assignment operator, one is declared implicitly. + // The implicitly-defined copy assignment operator for a class X + // will have the form + // + // X& X::operator=(const X&) + // + // if + bool HasConstCopyAssignment = true; + + // -- each direct base class B of X has a copy assignment operator + // whose parameter is of type const B&, const volatile B& or B, + // and + for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); + HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { + const CXXRecordDecl *BaseClassDecl + = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); + HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); + } + + // -- for all the nonstatic data members of X that are of a class + // type M (or array thereof), each such class type has a copy + // assignment operator whose parameter is of type const M&, + // const volatile M& or M. + for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(Context); + HasConstCopyAssignment && Field != ClassDecl->field_end(Context); + ++Field) { + QualType FieldType = (*Field)->getType(); + if (const ArrayType *Array = Context.getAsArrayType(FieldType)) + FieldType = Array->getElementType(); + if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { + const CXXRecordDecl *FieldClassDecl + = cast<CXXRecordDecl>(FieldClassType->getDecl()); + HasConstCopyAssignment + = FieldClassDecl->hasConstCopyAssignment(Context); + } + } + + // Otherwise, the implicitly declared copy assignment operator will + // have the form + // + // X& X::operator=(X&) + QualType ArgType = ClassType; + QualType RetType = Context.getLValueReferenceType(ArgType); + if (HasConstCopyAssignment) + ArgType = ArgType.withConst(); + ArgType = Context.getLValueReferenceType(ArgType); + + // An implicitly-declared copy assignment operator is an inline public + // member of its class. + DeclarationName Name = + Context.DeclarationNames.getCXXOperatorName(OO_Equal); + CXXMethodDecl *CopyAssignment = + CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, + Context.getFunctionType(RetType, &ArgType, 1, + false, 0), + /*isStatic=*/false, /*isInline=*/true); + CopyAssignment->setAccess(AS_public); + CopyAssignment->setImplicit(); + + // Add the parameter to the operator. + ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, + ClassDecl->getLocation(), + /*IdentifierInfo=*/0, + ArgType, VarDecl::None, 0); + CopyAssignment->setParams(Context, &FromParam, 1); + + // Don't call addedAssignmentOperator. There is no way to distinguish an + // implicit from an explicit assignment operator. + ClassDecl->addDecl(Context, CopyAssignment); + } + + if (!ClassDecl->hasUserDeclaredDestructor()) { + // C++ [class.dtor]p2: + // If a class has no user-declared destructor, a destructor is + // declared implicitly. An implicitly-declared destructor is an + // inline public member of its class. + DeclarationName Name + = Context.DeclarationNames.getCXXDestructorName(ClassType); + CXXDestructorDecl *Destructor + = CXXDestructorDecl::Create(Context, ClassDecl, + ClassDecl->getLocation(), Name, + Context.getFunctionType(Context.VoidTy, + 0, 0, false, 0), + /*isInline=*/true, + /*isImplicitlyDeclared=*/true); + Destructor->setAccess(AS_public); + Destructor->setImplicit(); + ClassDecl->addDecl(Context, Destructor); + } +} + +void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { + TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); + if (!Template) + return; + + TemplateParameterList *Params = Template->getTemplateParameters(); + for (TemplateParameterList::iterator Param = Params->begin(), + ParamEnd = Params->end(); + Param != ParamEnd; ++Param) { + NamedDecl *Named = cast<NamedDecl>(*Param); + if (Named->getDeclName()) { + S->AddDecl(DeclPtrTy::make(Named)); + IdResolver.AddDecl(Named); + } + } +} + +/// ActOnStartDelayedCXXMethodDeclaration - We have completed +/// parsing a top-level (non-nested) C++ class, and we are now +/// parsing those parts of the given Method declaration that could +/// not be parsed earlier (C++ [class.mem]p2), such as default +/// arguments. This action should enter the scope of the given +/// Method declaration as if we had just parsed the qualified method +/// name. However, it should not bring the parameters into scope; +/// that will be performed by ActOnDelayedCXXMethodParameter. +void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { + CXXScopeSpec SS; + FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); + QualType ClassTy + = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); + SS.setScopeRep( + NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); + ActOnCXXEnterDeclaratorScope(S, SS); +} + +/// ActOnDelayedCXXMethodParameter - We've already started a delayed +/// C++ method declaration. We're (re-)introducing the given +/// function parameter into scope for use in parsing later parts of +/// the method declaration. For example, we could see an +/// ActOnParamDefaultArgument event for this parameter. +void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { + ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); + + // If this parameter has an unparsed default argument, clear it out + // to make way for the parsed default argument. + if (Param->hasUnparsedDefaultArg()) + Param->setDefaultArg(0); + + S->AddDecl(DeclPtrTy::make(Param)); + if (Param->getDeclName()) + IdResolver.AddDecl(Param); +} + +/// ActOnFinishDelayedCXXMethodDeclaration - We have finished +/// processing the delayed method declaration for Method. The method +/// declaration is now considered finished. There may be a separate +/// ActOnStartOfFunctionDef action later (not necessarily +/// immediately!) for this method, if it was also defined inside the +/// class body. +void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { + FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); + CXXScopeSpec SS; + QualType ClassTy + = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); + SS.setScopeRep( + NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); + ActOnCXXExitDeclaratorScope(S, SS); + + // Now that we have our default arguments, check the constructor + // again. It could produce additional diagnostics or affect whether + // the class has implicitly-declared destructors, among other + // things. + if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) + CheckConstructor(Constructor); + + // Check the default arguments, which we may have added. + if (!Method->isInvalidDecl()) + CheckCXXDefaultArguments(Method); +} + +/// CheckConstructorDeclarator - Called by ActOnDeclarator to check +/// the well-formedness of the constructor declarator @p D with type @p +/// R. If there are any errors in the declarator, this routine will +/// emit diagnostics and set the invalid bit to true. In any case, the type +/// will be updated to reflect a well-formed type for the constructor and +/// returned. +QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, + FunctionDecl::StorageClass &SC) { + bool isVirtual = D.getDeclSpec().isVirtualSpecified(); + + // C++ [class.ctor]p3: + // A constructor shall not be virtual (10.3) or static (9.4). A + // constructor can be invoked for a const, volatile or const + // volatile object. A constructor shall not be declared const, + // volatile, or const volatile (9.3.2). + if (isVirtual) { + if (!D.isInvalidType()) + Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) + << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) + << SourceRange(D.getIdentifierLoc()); + D.setInvalidType(); + } + if (SC == FunctionDecl::Static) { + if (!D.isInvalidType()) + Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) + << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) + << SourceRange(D.getIdentifierLoc()); + D.setInvalidType(); + SC = FunctionDecl::None; + } + + DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; + if (FTI.TypeQuals != 0) { + if (FTI.TypeQuals & QualType::Const) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) + << "const" << SourceRange(D.getIdentifierLoc()); + if (FTI.TypeQuals & QualType::Volatile) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) + << "volatile" << SourceRange(D.getIdentifierLoc()); + if (FTI.TypeQuals & QualType::Restrict) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) + << "restrict" << SourceRange(D.getIdentifierLoc()); + } + + // Rebuild the function type "R" without any type qualifiers (in + // case any of the errors above fired) and with "void" as the + // return type, since constructors don't have return types. We + // *always* have to do this, because GetTypeForDeclarator will + // put in a result type of "int" when none was specified. + const FunctionProtoType *Proto = R->getAsFunctionProtoType(); + return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), + Proto->getNumArgs(), + Proto->isVariadic(), 0); +} + +/// CheckConstructor - Checks a fully-formed constructor for +/// well-formedness, issuing any diagnostics required. Returns true if +/// the constructor declarator is invalid. +void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { + CXXRecordDecl *ClassDecl + = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); + if (!ClassDecl) + return Constructor->setInvalidDecl(); + + // C++ [class.copy]p3: + // A declaration of a constructor for a class X is ill-formed if + // its first parameter is of type (optionally cv-qualified) X and + // either there are no other parameters or else all other + // parameters have default arguments. + if (!Constructor->isInvalidDecl() && + ((Constructor->getNumParams() == 1) || + (Constructor->getNumParams() > 1 && + Constructor->getParamDecl(1)->getDefaultArg() != 0))) { + QualType ParamType = Constructor->getParamDecl(0)->getType(); + QualType ClassTy = Context.getTagDeclType(ClassDecl); + if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { + SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); + Diag(ParamLoc, diag::err_constructor_byvalue_arg) + << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); + Constructor->setInvalidDecl(); + } + } + + // Notify the class that we've added a constructor. + ClassDecl->addedConstructor(Context, Constructor); +} + +static inline bool +FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { + return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && + FTI.ArgInfo[0].Param && + FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); +} + +/// CheckDestructorDeclarator - Called by ActOnDeclarator to check +/// the well-formednes of the destructor declarator @p D with type @p +/// R. If there are any errors in the declarator, this routine will +/// emit diagnostics and set the declarator to invalid. Even if this happens, +/// will be updated to reflect a well-formed type for the destructor and +/// returned. +QualType Sema::CheckDestructorDeclarator(Declarator &D, + FunctionDecl::StorageClass& SC) { + // C++ [class.dtor]p1: + // [...] A typedef-name that names a class is a class-name + // (7.1.3); however, a typedef-name that names a class shall not + // be used as the identifier in the declarator for a destructor + // declaration. + QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); + if (isa<TypedefType>(DeclaratorType)) { + Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) + << DeclaratorType; + D.setInvalidType(); + } + + // C++ [class.dtor]p2: + // A destructor is used to destroy objects of its class type. A + // destructor takes no parameters, and no return type can be + // specified for it (not even void). The address of a destructor + // shall not be taken. A destructor shall not be static. A + // destructor can be invoked for a const, volatile or const + // volatile object. A destructor shall not be declared const, + // volatile or const volatile (9.3.2). + if (SC == FunctionDecl::Static) { + if (!D.isInvalidType()) + Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) + << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) + << SourceRange(D.getIdentifierLoc()); + SC = FunctionDecl::None; + D.setInvalidType(); + } + if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { + // Destructors don't have return types, but the parser will + // happily parse something like: + // + // class X { + // float ~X(); + // }; + // + // The return type will be eliminated later. + Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) + << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) + << SourceRange(D.getIdentifierLoc()); + } + + DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; + if (FTI.TypeQuals != 0 && !D.isInvalidType()) { + if (FTI.TypeQuals & QualType::Const) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) + << "const" << SourceRange(D.getIdentifierLoc()); + if (FTI.TypeQuals & QualType::Volatile) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) + << "volatile" << SourceRange(D.getIdentifierLoc()); + if (FTI.TypeQuals & QualType::Restrict) + Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) + << "restrict" << SourceRange(D.getIdentifierLoc()); + D.setInvalidType(); + } + + // Make sure we don't have any parameters. + if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { + Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); + + // Delete the parameters. + FTI.freeArgs(); + D.setInvalidType(); + } + + // Make sure the destructor isn't variadic. + if (FTI.isVariadic) { + Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); + D.setInvalidType(); + } + + // Rebuild the function type "R" without any type qualifiers or + // parameters (in case any of the errors above fired) and with + // "void" as the return type, since destructors don't have return + // types. We *always* have to do this, because GetTypeForDeclarator + // will put in a result type of "int" when none was specified. + return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); +} + +/// CheckConversionDeclarator - Called by ActOnDeclarator to check the +/// well-formednes of the conversion function declarator @p D with +/// type @p R. If there are any errors in the declarator, this routine +/// will emit diagnostics and return true. Otherwise, it will return +/// false. Either way, the type @p R will be updated to reflect a +/// well-formed type for the conversion operator. +void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, + FunctionDecl::StorageClass& SC) { + // C++ [class.conv.fct]p1: + // Neither parameter types nor return type can be specified. The + // type of a conversion function (8.3.5) is “function taking no + // parameter returning conversion-type-id.” + if (SC == FunctionDecl::Static) { + if (!D.isInvalidType()) + Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) + << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) + << SourceRange(D.getIdentifierLoc()); + D.setInvalidType(); + SC = FunctionDecl::None; + } + if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { + // Conversion functions don't have return types, but the parser will + // happily parse something like: + // + // class X { + // float operator bool(); + // }; + // + // The return type will be changed later anyway. + Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) + << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) + << SourceRange(D.getIdentifierLoc()); + } + + // Make sure we don't have any parameters. + if (R->getAsFunctionProtoType()->getNumArgs() > 0) { + Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); + + // Delete the parameters. + D.getTypeObject(0).Fun.freeArgs(); + D.setInvalidType(); + } + + // Make sure the conversion function isn't variadic. + if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { + Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); + D.setInvalidType(); + } + + // C++ [class.conv.fct]p4: + // The conversion-type-id shall not represent a function type nor + // an array type. + QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); + if (ConvType->isArrayType()) { + Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); + ConvType = Context.getPointerType(ConvType); + D.setInvalidType(); + } else if (ConvType->isFunctionType()) { + Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); + ConvType = Context.getPointerType(ConvType); + D.setInvalidType(); + } + + // Rebuild the function type "R" without any parameters (in case any + // of the errors above fired) and with the conversion type as the + // return type. + R = Context.getFunctionType(ConvType, 0, 0, false, + R->getAsFunctionProtoType()->getTypeQuals()); + + // C++0x explicit conversion operators. + if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) + Diag(D.getDeclSpec().getExplicitSpecLoc(), + diag::warn_explicit_conversion_functions) + << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); +} + +/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete +/// the declaration of the given C++ conversion function. This routine +/// is responsible for recording the conversion function in the C++ +/// class, if possible. +Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { + assert(Conversion && "Expected to receive a conversion function declaration"); + + // Set the lexical context of this conversion function + Conversion->setLexicalDeclContext(CurContext); + + CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); + + // Make sure we aren't redeclaring the conversion function. + QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); + + // C++ [class.conv.fct]p1: + // [...] A conversion function is never used to convert a + // (possibly cv-qualified) object to the (possibly cv-qualified) + // same object type (or a reference to it), to a (possibly + // cv-qualified) base class of that type (or a reference to it), + // or to (possibly cv-qualified) void. + // FIXME: Suppress this warning if the conversion function ends up being a + // virtual function that overrides a virtual function in a base class. + QualType ClassType + = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); + if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) + ConvType = ConvTypeRef->getPointeeType(); + if (ConvType->isRecordType()) { + ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); + if (ConvType == ClassType) + Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) + << ClassType; + else if (IsDerivedFrom(ClassType, ConvType)) + Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) + << ClassType << ConvType; + } else if (ConvType->isVoidType()) { + Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) + << ClassType << ConvType; + } + + if (Conversion->getPreviousDeclaration()) { + OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); + for (OverloadedFunctionDecl::function_iterator + Conv = Conversions->function_begin(), + ConvEnd = Conversions->function_end(); + Conv != ConvEnd; ++Conv) { + if (*Conv == Conversion->getPreviousDeclaration()) { + *Conv = Conversion; + return DeclPtrTy::make(Conversion); + } + } + assert(Conversion->isInvalidDecl() && "Conversion should not get here."); + } else + ClassDecl->addConversionFunction(Context, Conversion); + + return DeclPtrTy::make(Conversion); +} + +//===----------------------------------------------------------------------===// +// Namespace Handling +//===----------------------------------------------------------------------===// + +/// ActOnStartNamespaceDef - This is called at the start of a namespace +/// definition. +Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, + SourceLocation IdentLoc, + IdentifierInfo *II, + SourceLocation LBrace) { + NamespaceDecl *Namespc = + NamespaceDecl::Create(Context, CurContext, IdentLoc, II); + Namespc->setLBracLoc(LBrace); + + Scope *DeclRegionScope = NamespcScope->getParent(); + + if (II) { + // C++ [namespace.def]p2: + // The identifier in an original-namespace-definition shall not have been + // previously defined in the declarative region in which the + // original-namespace-definition appears. The identifier in an + // original-namespace-definition is the name of the namespace. Subsequently + // in that declarative region, it is treated as an original-namespace-name. + + NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, + true); + + if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { + // This is an extended namespace definition. + // Attach this namespace decl to the chain of extended namespace + // definitions. + OrigNS->setNextNamespace(Namespc); + Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); + + // Remove the previous declaration from the scope. + if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { + IdResolver.RemoveDecl(OrigNS); + DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); + } + } else if (PrevDecl) { + // This is an invalid name redefinition. + Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) + << Namespc->getDeclName(); + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + Namespc->setInvalidDecl(); + // Continue on to push Namespc as current DeclContext and return it. + } + + PushOnScopeChains(Namespc, DeclRegionScope); + } else { + // FIXME: Handle anonymous namespaces + } + + // Although we could have an invalid decl (i.e. the namespace name is a + // redefinition), push it as current DeclContext and try to continue parsing. + // FIXME: We should be able to push Namespc here, so that the each DeclContext + // for the namespace has the declarations that showed up in that particular + // namespace definition. + PushDeclContext(NamespcScope, Namespc); + return DeclPtrTy::make(Namespc); +} + +/// ActOnFinishNamespaceDef - This callback is called after a namespace is +/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. +void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { + Decl *Dcl = D.getAs<Decl>(); + NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); + assert(Namespc && "Invalid parameter, expected NamespaceDecl"); + Namespc->setRBracLoc(RBrace); + PopDeclContext(); +} + +Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, + SourceLocation UsingLoc, + SourceLocation NamespcLoc, + const CXXScopeSpec &SS, + SourceLocation IdentLoc, + IdentifierInfo *NamespcName, + AttributeList *AttrList) { + assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); + assert(NamespcName && "Invalid NamespcName."); + assert(IdentLoc.isValid() && "Invalid NamespceName location."); + assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); + + UsingDirectiveDecl *UDir = 0; + + // Lookup namespace name. + LookupResult R = LookupParsedName(S, &SS, NamespcName, + LookupNamespaceName, false); + if (R.isAmbiguous()) { + DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); + return DeclPtrTy(); + } + if (NamedDecl *NS = R) { + assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); + // C++ [namespace.udir]p1: + // A using-directive specifies that the names in the nominated + // namespace can be used in the scope in which the + // using-directive appears after the using-directive. During + // unqualified name lookup (3.4.1), the names appear as if they + // were declared in the nearest enclosing namespace which + // contains both the using-directive and the nominated + // namespace. [Note: in this context, “contains” means “contains + // directly or indirectly”. ] + + // Find enclosing context containing both using-directive and + // nominated namespace. + DeclContext *CommonAncestor = cast<DeclContext>(NS); + while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) + CommonAncestor = CommonAncestor->getParent(); + + UDir = UsingDirectiveDecl::Create(Context, + CurContext, UsingLoc, + NamespcLoc, + SS.getRange(), + (NestedNameSpecifier *)SS.getScopeRep(), + IdentLoc, + cast<NamespaceDecl>(NS), + CommonAncestor); + PushUsingDirective(S, UDir); + } else { + Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); + } + + // FIXME: We ignore attributes for now. + delete AttrList; + return DeclPtrTy::make(UDir); +} + +void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { + // If scope has associated entity, then using directive is at namespace + // or translation unit scope. We add UsingDirectiveDecls, into + // it's lookup structure. + if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) + Ctx->addDecl(Context, UDir); + else + // Otherwise it is block-sope. using-directives will affect lookup + // only to the end of scope. + S->PushUsingDirective(DeclPtrTy::make(UDir)); +} + +/// getNamespaceDecl - Returns the namespace a decl represents. If the decl +/// is a namespace alias, returns the namespace it points to. +static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { + if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) + return AD->getNamespace(); + return dyn_cast_or_null<NamespaceDecl>(D); +} + +Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, + SourceLocation NamespaceLoc, + SourceLocation AliasLoc, + IdentifierInfo *Alias, + const CXXScopeSpec &SS, + SourceLocation IdentLoc, + IdentifierInfo *Ident) { + + // Lookup the namespace name. + LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); + + // Check if we have a previous declaration with the same name. + if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { + if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { + // We already have an alias with the same name that points to the same + // namespace, so don't create a new one. + if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) + return DeclPtrTy(); + } + + unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : + diag::err_redefinition_different_kind; + Diag(AliasLoc, DiagID) << Alias; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + return DeclPtrTy(); + } + + if (R.isAmbiguous()) { + DiagnoseAmbiguousLookup(R, Ident, IdentLoc); + return DeclPtrTy(); + } + + if (!R) { + Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); + return DeclPtrTy(); + } + + NamespaceAliasDecl *AliasDecl = + NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, + Alias, SS.getRange(), + (NestedNameSpecifier *)SS.getScopeRep(), + IdentLoc, R); + + CurContext->addDecl(Context, AliasDecl); + return DeclPtrTy::make(AliasDecl); +} + +void Sema::InitializeVarWithConstructor(VarDecl *VD, + CXXConstructorDecl *Constructor, + QualType DeclInitType, + Expr **Exprs, unsigned NumExprs) { + Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, + false, Exprs, NumExprs); + VD->setInit(Context, Temp); +} + +/// AddCXXDirectInitializerToDecl - This action is called immediately after +/// ActOnDeclarator, when a C++ direct initializer is present. +/// e.g: "int x(1);" +void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, + SourceLocation LParenLoc, + MultiExprArg Exprs, + SourceLocation *CommaLocs, + SourceLocation RParenLoc) { + unsigned NumExprs = Exprs.size(); + assert(NumExprs != 0 && Exprs.get() && "missing expressions"); + Decl *RealDecl = Dcl.getAs<Decl>(); + + // If there is no declaration, there was an error parsing it. Just ignore + // the initializer. + if (RealDecl == 0) + return; + + VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); + if (!VDecl) { + Diag(RealDecl->getLocation(), diag::err_illegal_initializer); + RealDecl->setInvalidDecl(); + return; + } + + // FIXME: Need to handle dependent types and expressions here. + + // We will treat direct-initialization as a copy-initialization: + // int x(1); -as-> int x = 1; + // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); + // + // Clients that want to distinguish between the two forms, can check for + // direct initializer using VarDecl::hasCXXDirectInitializer(). + // A major benefit is that clients that don't particularly care about which + // exactly form was it (like the CodeGen) can handle both cases without + // special case code. + + // C++ 8.5p11: + // The form of initialization (using parentheses or '=') is generally + // insignificant, but does matter when the entity being initialized has a + // class type. + QualType DeclInitType = VDecl->getType(); + if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) + DeclInitType = Array->getElementType(); + + // FIXME: This isn't the right place to complete the type. + if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), + diag::err_typecheck_decl_incomplete_type)) { + VDecl->setInvalidDecl(); + return; + } + + if (VDecl->getType()->isRecordType()) { + CXXConstructorDecl *Constructor + = PerformInitializationByConstructor(DeclInitType, + (Expr **)Exprs.get(), NumExprs, + VDecl->getLocation(), + SourceRange(VDecl->getLocation(), + RParenLoc), + VDecl->getDeclName(), + IK_Direct); + if (!Constructor) + RealDecl->setInvalidDecl(); + else { + VDecl->setCXXDirectInitializer(true); + InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, + (Expr**)Exprs.release(), NumExprs); + } + return; + } + + if (NumExprs > 1) { + Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) + << SourceRange(VDecl->getLocation(), RParenLoc); + RealDecl->setInvalidDecl(); + return; + } + + // Let clients know that initialization was done with a direct initializer. + VDecl->setCXXDirectInitializer(true); + + assert(NumExprs == 1 && "Expected 1 expression"); + // Set the init expression, handles conversions. + AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), + /*DirectInit=*/true); +} + +/// PerformInitializationByConstructor - Perform initialization by +/// constructor (C++ [dcl.init]p14), which may occur as part of +/// direct-initialization or copy-initialization. We are initializing +/// an object of type @p ClassType with the given arguments @p +/// Args. @p Loc is the location in the source code where the +/// initializer occurs (e.g., a declaration, member initializer, +/// functional cast, etc.) while @p Range covers the whole +/// initialization. @p InitEntity is the entity being initialized, +/// which may by the name of a declaration or a type. @p Kind is the +/// kind of initialization we're performing, which affects whether +/// explicit constructors will be considered. When successful, returns +/// the constructor that will be used to perform the initialization; +/// when the initialization fails, emits a diagnostic and returns +/// null. +CXXConstructorDecl * +Sema::PerformInitializationByConstructor(QualType ClassType, + Expr **Args, unsigned NumArgs, + SourceLocation Loc, SourceRange Range, + DeclarationName InitEntity, + InitializationKind Kind) { + const RecordType *ClassRec = ClassType->getAsRecordType(); + assert(ClassRec && "Can only initialize a class type here"); + + // C++ [dcl.init]p14: + // + // If the initialization is direct-initialization, or if it is + // copy-initialization where the cv-unqualified version of the + // source type is the same class as, or a derived class of, the + // class of the destination, constructors are considered. The + // applicable constructors are enumerated (13.3.1.3), and the + // best one is chosen through overload resolution (13.3). The + // constructor so selected is called to initialize the object, + // with the initializer expression(s) as its argument(s). If no + // constructor applies, or the overload resolution is ambiguous, + // the initialization is ill-formed. + const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); + OverloadCandidateSet CandidateSet; + + // Add constructors to the overload set. + DeclarationName ConstructorName + = Context.DeclarationNames.getCXXConstructorName( + Context.getCanonicalType(ClassType.getUnqualifiedType())); + DeclContext::lookup_const_iterator Con, ConEnd; + for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(Context, ConstructorName); + Con != ConEnd; ++Con) { + CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); + if ((Kind == IK_Direct) || + (Kind == IK_Copy && Constructor->isConvertingConstructor()) || + (Kind == IK_Default && Constructor->isDefaultConstructor())) + AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); + } + + // FIXME: When we decide not to synthesize the implicitly-declared + // constructors, we'll need to make them appear here. + + OverloadCandidateSet::iterator Best; + switch (BestViableFunction(CandidateSet, Best)) { + case OR_Success: + // We found a constructor. Return it. + return cast<CXXConstructorDecl>(Best->Function); + + case OR_No_Viable_Function: + if (InitEntity) + Diag(Loc, diag::err_ovl_no_viable_function_in_init) + << InitEntity << Range; + else + Diag(Loc, diag::err_ovl_no_viable_function_in_init) + << ClassType << Range; + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); + return 0; + + case OR_Ambiguous: + if (InitEntity) + Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; + else + Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return 0; + + case OR_Deleted: + if (InitEntity) + Diag(Loc, diag::err_ovl_deleted_init) + << Best->Function->isDeleted() + << InitEntity << Range; + else + Diag(Loc, diag::err_ovl_deleted_init) + << Best->Function->isDeleted() + << InitEntity << Range; + PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); + return 0; + } + + return 0; +} + +/// CompareReferenceRelationship - Compare the two types T1 and T2 to +/// determine whether they are reference-related, +/// reference-compatible, reference-compatible with added +/// qualification, or incompatible, for use in C++ initialization by +/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference +/// type, and the first type (T1) is the pointee type of the reference +/// type being initialized. +Sema::ReferenceCompareResult +Sema::CompareReferenceRelationship(QualType T1, QualType T2, + bool& DerivedToBase) { + assert(!T1->isReferenceType() && + "T1 must be the pointee type of the reference type"); + assert(!T2->isReferenceType() && "T2 cannot be a reference type"); + + T1 = Context.getCanonicalType(T1); + T2 = Context.getCanonicalType(T2); + QualType UnqualT1 = T1.getUnqualifiedType(); + QualType UnqualT2 = T2.getUnqualifiedType(); + + // C++ [dcl.init.ref]p4: + // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is + // reference-related to “cv2 T2” if T1 is the same type as T2, or + // T1 is a base class of T2. + if (UnqualT1 == UnqualT2) + DerivedToBase = false; + else if (IsDerivedFrom(UnqualT2, UnqualT1)) + DerivedToBase = true; + else + return Ref_Incompatible; + + // At this point, we know that T1 and T2 are reference-related (at + // least). + + // C++ [dcl.init.ref]p4: + // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is + // reference-related to T2 and cv1 is the same cv-qualification + // as, or greater cv-qualification than, cv2. For purposes of + // overload resolution, cases for which cv1 is greater + // cv-qualification than cv2 are identified as + // reference-compatible with added qualification (see 13.3.3.2). + if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) + return Ref_Compatible; + else if (T1.isMoreQualifiedThan(T2)) + return Ref_Compatible_With_Added_Qualification; + else + return Ref_Related; +} + +/// CheckReferenceInit - Check the initialization of a reference +/// variable with the given initializer (C++ [dcl.init.ref]). Init is +/// the initializer (either a simple initializer or an initializer +/// list), and DeclType is the type of the declaration. When ICS is +/// non-null, this routine will compute the implicit conversion +/// sequence according to C++ [over.ics.ref] and will not produce any +/// diagnostics; when ICS is null, it will emit diagnostics when any +/// errors are found. Either way, a return value of true indicates +/// that there was a failure, a return value of false indicates that +/// the reference initialization succeeded. +/// +/// When @p SuppressUserConversions, user-defined conversions are +/// suppressed. +/// When @p AllowExplicit, we also permit explicit user-defined +/// conversion functions. +/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. +bool +Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, + ImplicitConversionSequence *ICS, + bool SuppressUserConversions, + bool AllowExplicit, bool ForceRValue) { + assert(DeclType->isReferenceType() && "Reference init needs a reference"); + + QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); + QualType T2 = Init->getType(); + + // If the initializer is the address of an overloaded function, try + // to resolve the overloaded function. If all goes well, T2 is the + // type of the resulting function. + if (Context.getCanonicalType(T2) == Context.OverloadTy) { + FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, + ICS != 0); + if (Fn) { + // Since we're performing this reference-initialization for + // real, update the initializer with the resulting function. + if (!ICS) { + if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) + return true; + + FixOverloadedFunctionReference(Init, Fn); + } + + T2 = Fn->getType(); + } + } + + // Compute some basic properties of the types and the initializer. + bool isRValRef = DeclType->isRValueReferenceType(); + bool DerivedToBase = false; + Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : + Init->isLvalue(Context); + ReferenceCompareResult RefRelationship + = CompareReferenceRelationship(T1, T2, DerivedToBase); + + // Most paths end in a failed conversion. + if (ICS) + ICS->ConversionKind = ImplicitConversionSequence::BadConversion; + + // C++ [dcl.init.ref]p5: + // A reference to type “cv1 T1” is initialized by an expression + // of type “cv2 T2” as follows: + + // -- If the initializer expression + + // Rvalue references cannot bind to lvalues (N2812). + // There is absolutely no situation where they can. In particular, note that + // this is ill-formed, even if B has a user-defined conversion to A&&: + // B b; + // A&& r = b; + if (isRValRef && InitLvalue == Expr::LV_Valid) { + if (!ICS) + Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) + << Init->getSourceRange(); + return true; + } + + bool BindsDirectly = false; + // -- is an lvalue (but is not a bit-field), and “cv1 T1” is + // reference-compatible with “cv2 T2,” or + // + // Note that the bit-field check is skipped if we are just computing + // the implicit conversion sequence (C++ [over.best.ics]p2). + if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && + RefRelationship >= Ref_Compatible_With_Added_Qualification) { + BindsDirectly = true; + + if (ICS) { + // C++ [over.ics.ref]p1: + // When a parameter of reference type binds directly (8.5.3) + // to an argument expression, the implicit conversion sequence + // is the identity conversion, unless the argument expression + // has a type that is a derived class of the parameter type, + // in which case the implicit conversion sequence is a + // derived-to-base Conversion (13.3.3.1). + ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; + ICS->Standard.First = ICK_Identity; + ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; + ICS->Standard.Third = ICK_Identity; + ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); + ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); + ICS->Standard.ReferenceBinding = true; + ICS->Standard.DirectBinding = true; + ICS->Standard.RRefBinding = false; + ICS->Standard.CopyConstructor = 0; + + // Nothing more to do: the inaccessibility/ambiguity check for + // derived-to-base conversions is suppressed when we're + // computing the implicit conversion sequence (C++ + // [over.best.ics]p2). + return false; + } else { + // Perform the conversion. + // FIXME: Binding to a subobject of the lvalue is going to require more + // AST annotation than this. + ImpCastExprToType(Init, T1, /*isLvalue=*/true); + } + } + + // -- has a class type (i.e., T2 is a class type) and can be + // implicitly converted to an lvalue of type “cv3 T3,” + // where “cv1 T1” is reference-compatible with “cv3 T3” + // 92) (this conversion is selected by enumerating the + // applicable conversion functions (13.3.1.6) and choosing + // the best one through overload resolution (13.3)), + if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { + // FIXME: Look for conversions in base classes! + CXXRecordDecl *T2RecordDecl + = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); + + OverloadCandidateSet CandidateSet; + OverloadedFunctionDecl *Conversions + = T2RecordDecl->getConversionFunctions(); + for (OverloadedFunctionDecl::function_iterator Func + = Conversions->function_begin(); + Func != Conversions->function_end(); ++Func) { + CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); + + // If the conversion function doesn't return a reference type, + // it can't be considered for this conversion. + if (Conv->getConversionType()->isLValueReferenceType() && + (AllowExplicit || !Conv->isExplicit())) + AddConversionCandidate(Conv, Init, DeclType, CandidateSet); + } + + OverloadCandidateSet::iterator Best; + switch (BestViableFunction(CandidateSet, Best)) { + case OR_Success: + // This is a direct binding. + BindsDirectly = true; + + if (ICS) { + // C++ [over.ics.ref]p1: + // + // [...] If the parameter binds directly to the result of + // applying a conversion function to the argument + // expression, the implicit conversion sequence is a + // user-defined conversion sequence (13.3.3.1.2), with the + // second standard conversion sequence either an identity + // conversion or, if the conversion function returns an + // entity of a type that is a derived class of the parameter + // type, a derived-to-base Conversion. + ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; + ICS->UserDefined.Before = Best->Conversions[0].Standard; + ICS->UserDefined.After = Best->FinalConversion; + ICS->UserDefined.ConversionFunction = Best->Function; + assert(ICS->UserDefined.After.ReferenceBinding && + ICS->UserDefined.After.DirectBinding && + "Expected a direct reference binding!"); + return false; + } else { + // Perform the conversion. + // FIXME: Binding to a subobject of the lvalue is going to require more + // AST annotation than this. + ImpCastExprToType(Init, T1, /*isLvalue=*/true); + } + break; + + case OR_Ambiguous: + assert(false && "Ambiguous reference binding conversions not implemented."); + return true; + + case OR_No_Viable_Function: + case OR_Deleted: + // There was no suitable conversion, or we found a deleted + // conversion; continue with other checks. + break; + } + } + + if (BindsDirectly) { + // C++ [dcl.init.ref]p4: + // [...] In all cases where the reference-related or + // reference-compatible relationship of two types is used to + // establish the validity of a reference binding, and T1 is a + // base class of T2, a program that necessitates such a binding + // is ill-formed if T1 is an inaccessible (clause 11) or + // ambiguous (10.2) base class of T2. + // + // Note that we only check this condition when we're allowed to + // complain about errors, because we should not be checking for + // ambiguity (or inaccessibility) unless the reference binding + // actually happens. + if (DerivedToBase) + return CheckDerivedToBaseConversion(T2, T1, + Init->getSourceRange().getBegin(), + Init->getSourceRange()); + else + return false; + } + + // -- Otherwise, the reference shall be to a non-volatile const + // type (i.e., cv1 shall be const), or the reference shall be an + // rvalue reference and the initializer expression shall be an rvalue. + if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { + if (!ICS) + Diag(Init->getSourceRange().getBegin(), + diag::err_not_reference_to_const_init) + << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") + << T2 << Init->getSourceRange(); + return true; + } + + // -- If the initializer expression is an rvalue, with T2 a + // class type, and “cv1 T1” is reference-compatible with + // “cv2 T2,” the reference is bound in one of the + // following ways (the choice is implementation-defined): + // + // -- The reference is bound to the object represented by + // the rvalue (see 3.10) or to a sub-object within that + // object. + // + // -- A temporary of type “cv1 T2” [sic] is created, and + // a constructor is called to copy the entire rvalue + // object into the temporary. The reference is bound to + // the temporary or to a sub-object within the + // temporary. + // + // The constructor that would be used to make the copy + // shall be callable whether or not the copy is actually + // done. + // + // Note that C++0x [dcl.init.ref]p5 takes away this implementation + // freedom, so we will always take the first option and never build + // a temporary in this case. FIXME: We will, however, have to check + // for the presence of a copy constructor in C++98/03 mode. + if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && + RefRelationship >= Ref_Compatible_With_Added_Qualification) { + if (ICS) { + ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; + ICS->Standard.First = ICK_Identity; + ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; + ICS->Standard.Third = ICK_Identity; + ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); + ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); + ICS->Standard.ReferenceBinding = true; + ICS->Standard.DirectBinding = false; + ICS->Standard.RRefBinding = isRValRef; + ICS->Standard.CopyConstructor = 0; + } else { + // FIXME: Binding to a subobject of the rvalue is going to require more + // AST annotation than this. + ImpCastExprToType(Init, T1, /*isLvalue=*/false); + } + return false; + } + + // -- Otherwise, a temporary of type “cv1 T1” is created and + // initialized from the initializer expression using the + // rules for a non-reference copy initialization (8.5). The + // reference is then bound to the temporary. If T1 is + // reference-related to T2, cv1 must be the same + // cv-qualification as, or greater cv-qualification than, + // cv2; otherwise, the program is ill-formed. + if (RefRelationship == Ref_Related) { + // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then + // we would be reference-compatible or reference-compatible with + // added qualification. But that wasn't the case, so the reference + // initialization fails. + if (!ICS) + Diag(Init->getSourceRange().getBegin(), + diag::err_reference_init_drops_quals) + << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") + << T2 << Init->getSourceRange(); + return true; + } + + // If at least one of the types is a class type, the types are not + // related, and we aren't allowed any user conversions, the + // reference binding fails. This case is important for breaking + // recursion, since TryImplicitConversion below will attempt to + // create a temporary through the use of a copy constructor. + if (SuppressUserConversions && RefRelationship == Ref_Incompatible && + (T1->isRecordType() || T2->isRecordType())) { + if (!ICS) + Diag(Init->getSourceRange().getBegin(), + diag::err_typecheck_convert_incompatible) + << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); + return true; + } + + // Actually try to convert the initializer to T1. + if (ICS) { + // C++ [over.ics.ref]p2: + // + // When a parameter of reference type is not bound directly to + // an argument expression, the conversion sequence is the one + // required to convert the argument expression to the + // underlying type of the reference according to + // 13.3.3.1. Conceptually, this conversion sequence corresponds + // to copy-initializing a temporary of the underlying type with + // the argument expression. Any difference in top-level + // cv-qualification is subsumed by the initialization itself + // and does not constitute a conversion. + *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); + // Of course, that's still a reference binding. + if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { + ICS->Standard.ReferenceBinding = true; + ICS->Standard.RRefBinding = isRValRef; + } else if(ICS->ConversionKind == + ImplicitConversionSequence::UserDefinedConversion) { + ICS->UserDefined.After.ReferenceBinding = true; + ICS->UserDefined.After.RRefBinding = isRValRef; + } + return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; + } else { + return PerformImplicitConversion(Init, T1, "initializing"); + } +} + +/// CheckOverloadedOperatorDeclaration - Check whether the declaration +/// of this overloaded operator is well-formed. If so, returns false; +/// otherwise, emits appropriate diagnostics and returns true. +bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { + assert(FnDecl && FnDecl->isOverloadedOperator() && + "Expected an overloaded operator declaration"); + + OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); + + // C++ [over.oper]p5: + // The allocation and deallocation functions, operator new, + // operator new[], operator delete and operator delete[], are + // described completely in 3.7.3. The attributes and restrictions + // found in the rest of this subclause do not apply to them unless + // explicitly stated in 3.7.3. + // FIXME: Write a separate routine for checking this. For now, just allow it. + if (Op == OO_New || Op == OO_Array_New || + Op == OO_Delete || Op == OO_Array_Delete) + return false; + + // C++ [over.oper]p6: + // An operator function shall either be a non-static member + // function or be a non-member function and have at least one + // parameter whose type is a class, a reference to a class, an + // enumeration, or a reference to an enumeration. + if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { + if (MethodDecl->isStatic()) + return Diag(FnDecl->getLocation(), + diag::err_operator_overload_static) << FnDecl->getDeclName(); + } else { + bool ClassOrEnumParam = false; + for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), + ParamEnd = FnDecl->param_end(); + Param != ParamEnd; ++Param) { + QualType ParamType = (*Param)->getType().getNonReferenceType(); + if (ParamType->isRecordType() || ParamType->isEnumeralType()) { + ClassOrEnumParam = true; + break; + } + } + + if (!ClassOrEnumParam) + return Diag(FnDecl->getLocation(), + diag::err_operator_overload_needs_class_or_enum) + << FnDecl->getDeclName(); + } + + // C++ [over.oper]p8: + // An operator function cannot have default arguments (8.3.6), + // except where explicitly stated below. + // + // Only the function-call operator allows default arguments + // (C++ [over.call]p1). + if (Op != OO_Call) { + for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); + Param != FnDecl->param_end(); ++Param) { + if ((*Param)->hasUnparsedDefaultArg()) + return Diag((*Param)->getLocation(), + diag::err_operator_overload_default_arg) + << FnDecl->getDeclName(); + else if (Expr *DefArg = (*Param)->getDefaultArg()) + return Diag((*Param)->getLocation(), + diag::err_operator_overload_default_arg) + << FnDecl->getDeclName() << DefArg->getSourceRange(); + } + } + + static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { + { false, false, false } +#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ + , { Unary, Binary, MemberOnly } +#include "clang/Basic/OperatorKinds.def" + }; + + bool CanBeUnaryOperator = OperatorUses[Op][0]; + bool CanBeBinaryOperator = OperatorUses[Op][1]; + bool MustBeMemberOperator = OperatorUses[Op][2]; + + // C++ [over.oper]p8: + // [...] Operator functions cannot have more or fewer parameters + // than the number required for the corresponding operator, as + // described in the rest of this subclause. + unsigned NumParams = FnDecl->getNumParams() + + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); + if (Op != OO_Call && + ((NumParams == 1 && !CanBeUnaryOperator) || + (NumParams == 2 && !CanBeBinaryOperator) || + (NumParams < 1) || (NumParams > 2))) { + // We have the wrong number of parameters. + unsigned ErrorKind; + if (CanBeUnaryOperator && CanBeBinaryOperator) { + ErrorKind = 2; // 2 -> unary or binary. + } else if (CanBeUnaryOperator) { + ErrorKind = 0; // 0 -> unary + } else { + assert(CanBeBinaryOperator && + "All non-call overloaded operators are unary or binary!"); + ErrorKind = 1; // 1 -> binary + } + + return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) + << FnDecl->getDeclName() << NumParams << ErrorKind; + } + + // Overloaded operators other than operator() cannot be variadic. + if (Op != OO_Call && + FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { + return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) + << FnDecl->getDeclName(); + } + + // Some operators must be non-static member functions. + if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { + return Diag(FnDecl->getLocation(), + diag::err_operator_overload_must_be_member) + << FnDecl->getDeclName(); + } + + // C++ [over.inc]p1: + // The user-defined function called operator++ implements the + // prefix and postfix ++ operator. If this function is a member + // function with no parameters, or a non-member function with one + // parameter of class or enumeration type, it defines the prefix + // increment operator ++ for objects of that type. If the function + // is a member function with one parameter (which shall be of type + // int) or a non-member function with two parameters (the second + // of which shall be of type int), it defines the postfix + // increment operator ++ for objects of that type. + if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { + ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); + bool ParamIsInt = false; + if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) + ParamIsInt = BT->getKind() == BuiltinType::Int; + + if (!ParamIsInt) + return Diag(LastParam->getLocation(), + diag::err_operator_overload_post_incdec_must_be_int) + << LastParam->getType() << (Op == OO_MinusMinus); + } + + // Notify the class if it got an assignment operator. + if (Op == OO_Equal) { + // Would have returned earlier otherwise. + assert(isa<CXXMethodDecl>(FnDecl) && + "Overloaded = not member, but not filtered."); + CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); + Method->getParent()->addedAssignmentOperator(Context, Method); + } + + return false; +} + +/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ +/// linkage specification, including the language and (if present) +/// the '{'. ExternLoc is the location of the 'extern', LangLoc is +/// the location of the language string literal, which is provided +/// by Lang/StrSize. LBraceLoc, if valid, provides the location of +/// the '{' brace. Otherwise, this linkage specification does not +/// have any braces. +Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, + SourceLocation ExternLoc, + SourceLocation LangLoc, + const char *Lang, + unsigned StrSize, + SourceLocation LBraceLoc) { + LinkageSpecDecl::LanguageIDs Language; + if (strncmp(Lang, "\"C\"", StrSize) == 0) + Language = LinkageSpecDecl::lang_c; + else if (strncmp(Lang, "\"C++\"", StrSize) == 0) + Language = LinkageSpecDecl::lang_cxx; + else { + Diag(LangLoc, diag::err_bad_language); + return DeclPtrTy(); + } + + // FIXME: Add all the various semantics of linkage specifications + + LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, + LangLoc, Language, + LBraceLoc.isValid()); + CurContext->addDecl(Context, D); + PushDeclContext(S, D); + return DeclPtrTy::make(D); +} + +/// ActOnFinishLinkageSpecification - Completely the definition of +/// the C++ linkage specification LinkageSpec. If RBraceLoc is +/// valid, it's the position of the closing '}' brace in a linkage +/// specification that uses braces. +Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, + DeclPtrTy LinkageSpec, + SourceLocation RBraceLoc) { + if (LinkageSpec) + PopDeclContext(); + return LinkageSpec; +} + +/// \brief Perform semantic analysis for the variable declaration that +/// occurs within a C++ catch clause, returning the newly-created +/// variable. +VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, + IdentifierInfo *Name, + SourceLocation Loc, + SourceRange Range) { + bool Invalid = false; + + // Arrays and functions decay. + if (ExDeclType->isArrayType()) + ExDeclType = Context.getArrayDecayedType(ExDeclType); + else if (ExDeclType->isFunctionType()) + ExDeclType = Context.getPointerType(ExDeclType); + + // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. + // The exception-declaration shall not denote a pointer or reference to an + // incomplete type, other than [cv] void*. + // N2844 forbids rvalue references. + if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { + Diag(Loc, diag::err_catch_rvalue_ref) << Range; + Invalid = true; + } + + QualType BaseType = ExDeclType; + int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference + unsigned DK = diag::err_catch_incomplete; + if (const PointerType *Ptr = BaseType->getAsPointerType()) { + BaseType = Ptr->getPointeeType(); + Mode = 1; + DK = diag::err_catch_incomplete_ptr; + } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { + // For the purpose of error recovery, we treat rvalue refs like lvalue refs. + BaseType = Ref->getPointeeType(); + Mode = 2; + DK = diag::err_catch_incomplete_ref; + } + if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && + !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) + Invalid = true; + + if (!Invalid && !ExDeclType->isDependentType() && + RequireNonAbstractType(Loc, ExDeclType, + diag::err_abstract_type_in_decl, + AbstractVariableType)) + Invalid = true; + + // FIXME: Need to test for ability to copy-construct and destroy the + // exception variable. + + // FIXME: Need to check for abstract classes. + + VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, + Name, ExDeclType, VarDecl::None, + Range.getBegin()); + + if (Invalid) + ExDecl->setInvalidDecl(); + + return ExDecl; +} + +/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch +/// handler. +Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { + QualType ExDeclType = GetTypeForDeclarator(D, S); + + bool Invalid = D.isInvalidType(); + IdentifierInfo *II = D.getIdentifier(); + if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { + // The scope should be freshly made just for us. There is just no way + // it contains any previous declaration. + assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); + if (PrevDecl->isTemplateParameter()) { + // Maybe we will complain about the shadowed template parameter. + DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); + } + } + + if (D.getCXXScopeSpec().isSet() && !Invalid) { + Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) + << D.getCXXScopeSpec().getRange(); + Invalid = true; + } + + VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, + D.getIdentifier(), + D.getIdentifierLoc(), + D.getDeclSpec().getSourceRange()); + + if (Invalid) + ExDecl->setInvalidDecl(); + + // Add the exception declaration into this scope. + if (II) + PushOnScopeChains(ExDecl, S); + else + CurContext->addDecl(Context, ExDecl); + + ProcessDeclAttributes(ExDecl, D); + return DeclPtrTy::make(ExDecl); +} + +Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, + ExprArg assertexpr, + ExprArg assertmessageexpr) { + Expr *AssertExpr = (Expr *)assertexpr.get(); + StringLiteral *AssertMessage = + cast<StringLiteral>((Expr *)assertmessageexpr.get()); + + if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { + llvm::APSInt Value(32); + if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { + Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << + AssertExpr->getSourceRange(); + return DeclPtrTy(); + } + + if (Value == 0) { + std::string str(AssertMessage->getStrData(), + AssertMessage->getByteLength()); + Diag(AssertLoc, diag::err_static_assert_failed) + << str << AssertExpr->getSourceRange(); + } + } + + assertexpr.release(); + assertmessageexpr.release(); + Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, + AssertExpr, AssertMessage); + + CurContext->addDecl(Context, Decl); + return DeclPtrTy::make(Decl); +} + +bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { + if (!(S->getFlags() & Scope::ClassScope)) { + Diag(FriendLoc, diag::err_friend_decl_outside_class); + return true; + } + + return false; +} + +void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { + Decl *Dcl = dcl.getAs<Decl>(); + FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); + if (!Fn) { + Diag(DelLoc, diag::err_deleted_non_function); + return; + } + if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { + Diag(DelLoc, diag::err_deleted_decl_not_first); + Diag(Prev->getLocation(), diag::note_previous_declaration); + // If the declaration wasn't the first, we delete the function anyway for + // recovery. + } + Fn->setDeleted(); +} + +static void SearchForReturnInStmt(Sema &Self, Stmt *S) { + for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; + ++CI) { + Stmt *SubStmt = *CI; + if (!SubStmt) + continue; + if (isa<ReturnStmt>(SubStmt)) + Self.Diag(SubStmt->getSourceRange().getBegin(), + diag::err_return_in_constructor_handler); + if (!isa<Expr>(SubStmt)) + SearchForReturnInStmt(Self, SubStmt); + } +} + +void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { + for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { + CXXCatchStmt *Handler = TryBlock->getHandler(I); + SearchForReturnInStmt(*this, Handler); + } +} + +bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, + const CXXMethodDecl *Old) { + QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); + QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); + + QualType CNewTy = Context.getCanonicalType(NewTy); + QualType COldTy = Context.getCanonicalType(OldTy); + + if (CNewTy == COldTy && + CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) + return false; + + // Check if the return types are covariant + QualType NewClassTy, OldClassTy; + + /// Both types must be pointers or references to classes. + if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { + if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { + NewClassTy = NewPT->getPointeeType(); + OldClassTy = OldPT->getPointeeType(); + } + } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { + if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { + NewClassTy = NewRT->getPointeeType(); + OldClassTy = OldRT->getPointeeType(); + } + } + + // The return types aren't either both pointers or references to a class type. + if (NewClassTy.isNull()) { + Diag(New->getLocation(), + diag::err_different_return_type_for_overriding_virtual_function) + << New->getDeclName() << NewTy << OldTy; + Diag(Old->getLocation(), diag::note_overridden_virtual_function); + + return true; + } + + if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { + // Check if the new class derives from the old class. + if (!IsDerivedFrom(NewClassTy, OldClassTy)) { + Diag(New->getLocation(), + diag::err_covariant_return_not_derived) + << New->getDeclName() << NewTy << OldTy; + Diag(Old->getLocation(), diag::note_overridden_virtual_function); + return true; + } + + // Check if we the conversion from derived to base is valid. + if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, + diag::err_covariant_return_inaccessible_base, + diag::err_covariant_return_ambiguous_derived_to_base_conv, + // FIXME: Should this point to the return type? + New->getLocation(), SourceRange(), New->getDeclName())) { + Diag(Old->getLocation(), diag::note_overridden_virtual_function); + return true; + } + } + + // The qualifiers of the return types must be the same. + if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { + Diag(New->getLocation(), + diag::err_covariant_return_type_different_qualifications) + << New->getDeclName() << NewTy << OldTy; + Diag(Old->getLocation(), diag::note_overridden_virtual_function); + return true; + }; + + + // The new class type must have the same or less qualifiers as the old type. + if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { + Diag(New->getLocation(), + diag::err_covariant_return_type_class_type_more_qualified) + << New->getDeclName() << NewTy << OldTy; + Diag(Old->getLocation(), diag::note_overridden_virtual_function); + return true; + }; + + return false; +} |