| //===--- SemaDecl.cpp - Semantic Analysis for 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 declarations. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Sema.h" |
| #include "SemaInherit.h" |
| #include "clang/AST/APValue.h" |
| #include "clang/AST/ASTConsumer.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/DeclTemplate.h" |
| #include "clang/AST/ExprCXX.h" |
| #include "clang/AST/StmtCXX.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Basic/SourceManager.h" |
| // FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Lex/HeaderSearch.h" |
| #include "llvm/ADT/SmallSet.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include <algorithm> |
| #include <functional> |
| using namespace clang; |
| |
| /// getDeclName - Return a pretty name for the specified decl if possible, or |
| /// an empty string if not. This is used for pretty crash reporting. |
| std::string Sema::getDeclName(DeclPtrTy d) { |
| Decl *D = d.getAs<Decl>(); |
| if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) |
| return DN->getQualifiedNameAsString(); |
| return ""; |
| } |
| |
| Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { |
| return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); |
| } |
| |
| /// \brief If the identifier refers to a type name within this scope, |
| /// return the declaration of that type. |
| /// |
| /// This routine performs ordinary name lookup of the identifier II |
| /// within the given scope, with optional C++ scope specifier SS, to |
| /// determine whether the name refers to a type. If so, returns an |
| /// opaque pointer (actually a QualType) corresponding to that |
| /// type. Otherwise, returns NULL. |
| /// |
| /// If name lookup results in an ambiguity, this routine will complain |
| /// and then return NULL. |
| Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, |
| Scope *S, const CXXScopeSpec *SS) { |
| // C++ [temp.res]p3: |
| // A qualified-id that refers to a type and in which the |
| // nested-name-specifier depends on a template-parameter (14.6.2) |
| // shall be prefixed by the keyword typename to indicate that the |
| // qualified-id denotes a type, forming an |
| // elaborated-type-specifier (7.1.5.3). |
| // |
| // We therefore do not perform any name lookup if the result would |
| // refer to a member of an unknown specialization. |
| if (SS && isUnknownSpecialization(*SS)) |
| return 0; |
| |
| LookupResult Result |
| = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); |
| |
| NamedDecl *IIDecl = 0; |
| switch (Result.getKind()) { |
| case LookupResult::NotFound: |
| case LookupResult::FoundOverloaded: |
| return 0; |
| |
| case LookupResult::AmbiguousBaseSubobjectTypes: |
| case LookupResult::AmbiguousBaseSubobjects: |
| case LookupResult::AmbiguousReference: { |
| // Look to see if we have a type anywhere in the list of results. |
| for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); |
| Res != ResEnd; ++Res) { |
| if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { |
| if (!IIDecl || |
| (*Res)->getLocation().getRawEncoding() < |
| IIDecl->getLocation().getRawEncoding()) |
| IIDecl = *Res; |
| } |
| } |
| |
| if (!IIDecl) { |
| // None of the entities we found is a type, so there is no way |
| // to even assume that the result is a type. In this case, don't |
| // complain about the ambiguity. The parser will either try to |
| // perform this lookup again (e.g., as an object name), which |
| // will produce the ambiguity, or will complain that it expected |
| // a type name. |
| Result.Destroy(); |
| return 0; |
| } |
| |
| // We found a type within the ambiguous lookup; diagnose the |
| // ambiguity and then return that type. This might be the right |
| // answer, or it might not be, but it suppresses any attempt to |
| // perform the name lookup again. |
| DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); |
| break; |
| } |
| |
| case LookupResult::Found: |
| IIDecl = Result.getAsDecl(); |
| break; |
| } |
| |
| if (IIDecl) { |
| QualType T; |
| |
| if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { |
| // Check whether we can use this type |
| (void)DiagnoseUseOfDecl(IIDecl, NameLoc); |
| |
| if (getLangOptions().CPlusPlus) { |
| // C++ [temp.local]p2: |
| // Within the scope of a class template specialization or |
| // partial specialization, when the injected-class-name is |
| // not followed by a <, it is equivalent to the |
| // injected-class-name followed by the template-argument s |
| // of the class template specialization or partial |
| // specialization enclosed in <>. |
| if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) |
| if (RD->isInjectedClassName()) |
| if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) |
| T = Template->getInjectedClassNameType(Context); |
| } |
| |
| if (T.isNull()) |
| T = Context.getTypeDeclType(TD); |
| } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { |
| // Check whether we can use this interface. |
| (void)DiagnoseUseOfDecl(IIDecl, NameLoc); |
| |
| T = Context.getObjCInterfaceType(IDecl); |
| } else |
| return 0; |
| |
| if (SS) |
| T = getQualifiedNameType(*SS, T); |
| |
| return T.getAsOpaquePtr(); |
| } |
| |
| return 0; |
| } |
| |
| /// isTagName() - This method is called *for error recovery purposes only* |
| /// to determine if the specified name is a valid tag name ("struct foo"). If |
| /// so, this returns the TST for the tag corresponding to it (TST_enum, |
| /// TST_union, TST_struct, TST_class). This is used to diagnose cases in C |
| /// where the user forgot to specify the tag. |
| DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { |
| // Do a tag name lookup in this scope. |
| LookupResult R = LookupName(S, &II, LookupTagName, false, false); |
| if (R.getKind() == LookupResult::Found) |
| if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { |
| switch (TD->getTagKind()) { |
| case TagDecl::TK_struct: return DeclSpec::TST_struct; |
| case TagDecl::TK_union: return DeclSpec::TST_union; |
| case TagDecl::TK_class: return DeclSpec::TST_class; |
| case TagDecl::TK_enum: return DeclSpec::TST_enum; |
| } |
| } |
| |
| return DeclSpec::TST_unspecified; |
| } |
| |
| |
| |
| DeclContext *Sema::getContainingDC(DeclContext *DC) { |
| if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { |
| // A C++ out-of-line method will return to the file declaration context. |
| if (MD->isOutOfLineDefinition()) |
| return MD->getLexicalDeclContext(); |
| |
| // A C++ inline method is parsed *after* the topmost class it was declared |
| // in is fully parsed (it's "complete"). |
| // The parsing of a C++ inline method happens at the declaration context of |
| // the topmost (non-nested) class it is lexically declared in. |
| assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); |
| DC = MD->getParent(); |
| while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) |
| DC = RD; |
| |
| // Return the declaration context of the topmost class the inline method is |
| // declared in. |
| return DC; |
| } |
| |
| if (isa<ObjCMethodDecl>(DC)) |
| return Context.getTranslationUnitDecl(); |
| |
| return DC->getLexicalParent(); |
| } |
| |
| void Sema::PushDeclContext(Scope *S, DeclContext *DC) { |
| assert(getContainingDC(DC) == CurContext && |
| "The next DeclContext should be lexically contained in the current one."); |
| CurContext = DC; |
| S->setEntity(DC); |
| } |
| |
| void Sema::PopDeclContext() { |
| assert(CurContext && "DeclContext imbalance!"); |
| |
| CurContext = getContainingDC(CurContext); |
| } |
| |
| /// \brief Determine whether we allow overloading of the function |
| /// PrevDecl with another declaration. |
| /// |
| /// This routine determines whether overloading is possible, not |
| /// whether some new function is actually an overload. It will return |
| /// true in C++ (where we can always provide overloads) or, as an |
| /// extension, in C when the previous function is already an |
| /// overloaded function declaration or has the "overloadable" |
| /// attribute. |
| static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { |
| if (Context.getLangOptions().CPlusPlus) |
| return true; |
| |
| if (isa<OverloadedFunctionDecl>(PrevDecl)) |
| return true; |
| |
| return PrevDecl->getAttr<OverloadableAttr>() != 0; |
| } |
| |
| /// Add this decl to the scope shadowed decl chains. |
| void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { |
| // Move up the scope chain until we find the nearest enclosing |
| // non-transparent context. The declaration will be introduced into this |
| // scope. |
| while (S->getEntity() && |
| ((DeclContext *)S->getEntity())->isTransparentContext()) |
| S = S->getParent(); |
| |
| S->AddDecl(DeclPtrTy::make(D)); |
| |
| // Add scoped declarations into their context, so that they can be |
| // found later. Declarations without a context won't be inserted |
| // into any context. |
| CurContext->addDecl(Context, D); |
| |
| // C++ [basic.scope]p4: |
| // -- exactly one declaration shall declare a class name or |
| // enumeration name that is not a typedef name and the other |
| // declarations shall all refer to the same object or |
| // enumerator, or all refer to functions and function templates; |
| // in this case the class name or enumeration name is hidden. |
| if (TagDecl *TD = dyn_cast<TagDecl>(D)) { |
| // We are pushing the name of a tag (enum or class). |
| if (CurContext->getLookupContext() |
| == TD->getDeclContext()->getLookupContext()) { |
| // We're pushing the tag into the current context, which might |
| // require some reshuffling in the identifier resolver. |
| IdentifierResolver::iterator |
| I = IdResolver.begin(TD->getDeclName()), |
| IEnd = IdResolver.end(); |
| if (I != IEnd && isDeclInScope(*I, CurContext, S)) { |
| NamedDecl *PrevDecl = *I; |
| for (; I != IEnd && isDeclInScope(*I, CurContext, S); |
| PrevDecl = *I, ++I) { |
| if (TD->declarationReplaces(*I)) { |
| // This is a redeclaration. Remove it from the chain and |
| // break out, so that we'll add in the shadowed |
| // declaration. |
| S->RemoveDecl(DeclPtrTy::make(*I)); |
| if (PrevDecl == *I) { |
| IdResolver.RemoveDecl(*I); |
| IdResolver.AddDecl(TD); |
| return; |
| } else { |
| IdResolver.RemoveDecl(*I); |
| break; |
| } |
| } |
| } |
| |
| // There is already a declaration with the same name in the same |
| // scope, which is not a tag declaration. It must be found |
| // before we find the new declaration, so insert the new |
| // declaration at the end of the chain. |
| IdResolver.AddShadowedDecl(TD, PrevDecl); |
| |
| return; |
| } |
| } |
| } else if (isa<FunctionDecl>(D) && |
| AllowOverloadingOfFunction(D, Context)) { |
| // We are pushing the name of a function, which might be an |
| // overloaded name. |
| FunctionDecl *FD = cast<FunctionDecl>(D); |
| IdentifierResolver::iterator Redecl |
| = std::find_if(IdResolver.begin(FD->getDeclName()), |
| IdResolver.end(), |
| std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), |
| FD)); |
| if (Redecl != IdResolver.end() && |
| S->isDeclScope(DeclPtrTy::make(*Redecl))) { |
| // There is already a declaration of a function on our |
| // IdResolver chain. Replace it with this declaration. |
| S->RemoveDecl(DeclPtrTy::make(*Redecl)); |
| IdResolver.RemoveDecl(*Redecl); |
| } |
| } else if (isa<ObjCInterfaceDecl>(D)) { |
| // We're pushing an Objective-C interface into the current |
| // context. If there is already an alias declaration, remove it first. |
| for (IdentifierResolver::iterator |
| I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); |
| I != IEnd; ++I) { |
| if (isa<ObjCCompatibleAliasDecl>(*I)) { |
| S->RemoveDecl(DeclPtrTy::make(*I)); |
| IdResolver.RemoveDecl(*I); |
| break; |
| } |
| } |
| } |
| |
| IdResolver.AddDecl(D); |
| } |
| |
| void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { |
| if (S->decl_empty()) return; |
| assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && |
| "Scope shouldn't contain decls!"); |
| |
| for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); |
| I != E; ++I) { |
| Decl *TmpD = (*I).getAs<Decl>(); |
| assert(TmpD && "This decl didn't get pushed??"); |
| |
| assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); |
| NamedDecl *D = cast<NamedDecl>(TmpD); |
| |
| if (!D->getDeclName()) continue; |
| |
| // Remove this name from our lexical scope. |
| IdResolver.RemoveDecl(D); |
| } |
| } |
| |
| /// getObjCInterfaceDecl - Look up a for a class declaration in the scope. |
| /// return 0 if one not found. |
| ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { |
| // The third "scope" argument is 0 since we aren't enabling lazy built-in |
| // creation from this context. |
| NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); |
| |
| return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); |
| } |
| |
| /// getNonFieldDeclScope - Retrieves the innermost scope, starting |
| /// from S, where a non-field would be declared. This routine copes |
| /// with the difference between C and C++ scoping rules in structs and |
| /// unions. For example, the following code is well-formed in C but |
| /// ill-formed in C++: |
| /// @code |
| /// struct S6 { |
| /// enum { BAR } e; |
| /// }; |
| /// |
| /// void test_S6() { |
| /// struct S6 a; |
| /// a.e = BAR; |
| /// } |
| /// @endcode |
| /// For the declaration of BAR, this routine will return a different |
| /// scope. The scope S will be the scope of the unnamed enumeration |
| /// within S6. In C++, this routine will return the scope associated |
| /// with S6, because the enumeration's scope is a transparent |
| /// context but structures can contain non-field names. In C, this |
| /// routine will return the translation unit scope, since the |
| /// enumeration's scope is a transparent context and structures cannot |
| /// contain non-field names. |
| Scope *Sema::getNonFieldDeclScope(Scope *S) { |
| while (((S->getFlags() & Scope::DeclScope) == 0) || |
| (S->getEntity() && |
| ((DeclContext *)S->getEntity())->isTransparentContext()) || |
| (S->isClassScope() && !getLangOptions().CPlusPlus)) |
| S = S->getParent(); |
| return S; |
| } |
| |
| void Sema::InitBuiltinVaListType() { |
| if (!Context.getBuiltinVaListType().isNull()) |
| return; |
| |
| IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); |
| NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); |
| TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); |
| Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); |
| } |
| |
| /// LazilyCreateBuiltin - The specified Builtin-ID was first used at |
| /// file scope. lazily create a decl for it. ForRedeclaration is true |
| /// if we're creating this built-in in anticipation of redeclaring the |
| /// built-in. |
| NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, |
| Scope *S, bool ForRedeclaration, |
| SourceLocation Loc) { |
| Builtin::ID BID = (Builtin::ID)bid; |
| |
| if (Context.BuiltinInfo.hasVAListUse(BID)) |
| InitBuiltinVaListType(); |
| |
| Builtin::Context::GetBuiltinTypeError Error; |
| QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); |
| switch (Error) { |
| case Builtin::Context::GE_None: |
| // Okay |
| break; |
| |
| case Builtin::Context::GE_Missing_FILE: |
| if (ForRedeclaration) |
| Diag(Loc, diag::err_implicit_decl_requires_stdio) |
| << Context.BuiltinInfo.GetName(BID); |
| return 0; |
| } |
| |
| if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { |
| Diag(Loc, diag::ext_implicit_lib_function_decl) |
| << Context.BuiltinInfo.GetName(BID) |
| << R; |
| if (Context.BuiltinInfo.getHeaderName(BID) && |
| Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) |
| != Diagnostic::Ignored) |
| Diag(Loc, diag::note_please_include_header) |
| << Context.BuiltinInfo.getHeaderName(BID) |
| << Context.BuiltinInfo.GetName(BID); |
| } |
| |
| FunctionDecl *New = FunctionDecl::Create(Context, |
| Context.getTranslationUnitDecl(), |
| Loc, II, R, |
| FunctionDecl::Extern, false, |
| /*hasPrototype=*/true); |
| New->setImplicit(); |
| |
| // Create Decl objects for each parameter, adding them to the |
| // FunctionDecl. |
| if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { |
| llvm::SmallVector<ParmVarDecl*, 16> Params; |
| for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) |
| Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, |
| FT->getArgType(i), VarDecl::None, 0)); |
| New->setParams(Context, Params.data(), Params.size()); |
| } |
| |
| AddKnownFunctionAttributes(New); |
| |
| // TUScope is the translation-unit scope to insert this function into. |
| // FIXME: This is hideous. We need to teach PushOnScopeChains to |
| // relate Scopes to DeclContexts, and probably eliminate CurContext |
| // entirely, but we're not there yet. |
| DeclContext *SavedContext = CurContext; |
| CurContext = Context.getTranslationUnitDecl(); |
| PushOnScopeChains(New, TUScope); |
| CurContext = SavedContext; |
| return New; |
| } |
| |
| /// GetStdNamespace - This method gets the C++ "std" namespace. This is where |
| /// everything from the standard library is defined. |
| NamespaceDecl *Sema::GetStdNamespace() { |
| if (!StdNamespace) { |
| IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); |
| DeclContext *Global = Context.getTranslationUnitDecl(); |
| Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); |
| StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); |
| } |
| return StdNamespace; |
| } |
| |
| /// MergeTypeDefDecl - We just parsed a typedef 'New' which has the |
| /// same name and scope as a previous declaration 'Old'. Figure out |
| /// how to resolve this situation, merging decls or emitting |
| /// diagnostics as appropriate. If there was an error, set New to be invalid. |
| /// |
| void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { |
| // If either decl is known invalid already, set the new one to be invalid and |
| // don't bother doing any merging checks. |
| if (New->isInvalidDecl() || OldD->isInvalidDecl()) |
| return New->setInvalidDecl(); |
| |
| bool objc_types = false; |
| |
| // Allow multiple definitions for ObjC built-in typedefs. |
| // FIXME: Verify the underlying types are equivalent! |
| if (getLangOptions().ObjC1) { |
| const IdentifierInfo *TypeID = New->getIdentifier(); |
| switch (TypeID->getLength()) { |
| default: break; |
| case 2: |
| if (!TypeID->isStr("id")) |
| break; |
| Context.setObjCIdType(Context.getTypeDeclType(New)); |
| objc_types = true; |
| break; |
| case 5: |
| if (!TypeID->isStr("Class")) |
| break; |
| Context.setObjCClassType(Context.getTypeDeclType(New)); |
| return; |
| case 3: |
| if (!TypeID->isStr("SEL")) |
| break; |
| Context.setObjCSelType(Context.getTypeDeclType(New)); |
| return; |
| case 8: |
| if (!TypeID->isStr("Protocol")) |
| break; |
| Context.setObjCProtoType(New->getUnderlyingType()); |
| return; |
| } |
| // Fall through - the typedef name was not a builtin type. |
| } |
| // Verify the old decl was also a type. |
| TypeDecl *Old = dyn_cast<TypeDecl>(OldD); |
| if (!Old) { |
| Diag(New->getLocation(), diag::err_redefinition_different_kind) |
| << New->getDeclName(); |
| if (OldD->getLocation().isValid()) |
| Diag(OldD->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| // Determine the "old" type we'll use for checking and diagnostics. |
| QualType OldType; |
| if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) |
| OldType = OldTypedef->getUnderlyingType(); |
| else |
| OldType = Context.getTypeDeclType(Old); |
| |
| // If the typedef types are not identical, reject them in all languages and |
| // with any extensions enabled. |
| |
| if (OldType != New->getUnderlyingType() && |
| Context.getCanonicalType(OldType) != |
| Context.getCanonicalType(New->getUnderlyingType())) { |
| Diag(New->getLocation(), diag::err_redefinition_different_typedef) |
| << New->getUnderlyingType() << OldType; |
| if (Old->getLocation().isValid()) |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| if (objc_types || getLangOptions().Microsoft) |
| return; |
| |
| // C++ [dcl.typedef]p2: |
| // In a given non-class scope, a typedef specifier can be used to |
| // redefine the name of any type declared in that scope to refer |
| // to the type to which it already refers. |
| if (getLangOptions().CPlusPlus) { |
| if (!isa<CXXRecordDecl>(CurContext)) |
| return; |
| Diag(New->getLocation(), diag::err_redefinition) |
| << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| // If we have a redefinition of a typedef in C, emit a warning. This warning |
| // is normally mapped to an error, but can be controlled with |
| // -Wtypedef-redefinition. If either the original was in a system header, |
| // don't emit this for compatibility with GCC. |
| if (PP.getDiagnostics().getSuppressSystemWarnings() && |
| Context.getSourceManager().isInSystemHeader(Old->getLocation())) |
| return; |
| |
| Diag(New->getLocation(), diag::warn_redefinition_of_typedef) |
| << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return; |
| } |
| |
| /// DeclhasAttr - returns true if decl Declaration already has the target |
| /// attribute. |
| static bool DeclHasAttr(const Decl *decl, const Attr *target) { |
| for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) |
| if (attr->getKind() == target->getKind()) |
| return true; |
| |
| return false; |
| } |
| |
| /// MergeAttributes - append attributes from the Old decl to the New one. |
| static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { |
| for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { |
| if (!DeclHasAttr(New, attr) && attr->isMerged()) { |
| Attr *NewAttr = attr->clone(C); |
| NewAttr->setInherited(true); |
| New->addAttr(NewAttr); |
| } |
| } |
| } |
| |
| /// Used in MergeFunctionDecl to keep track of function parameters in |
| /// C. |
| struct GNUCompatibleParamWarning { |
| ParmVarDecl *OldParm; |
| ParmVarDecl *NewParm; |
| QualType PromotedType; |
| }; |
| |
| /// MergeFunctionDecl - We just parsed a function 'New' from |
| /// declarator D which has the same name and scope as a previous |
| /// declaration 'Old'. Figure out how to resolve this situation, |
| /// merging decls or emitting diagnostics as appropriate. |
| /// |
| /// In C++, New and Old must be declarations that are not |
| /// overloaded. Use IsOverload to determine whether New and Old are |
| /// overloaded, and to select the Old declaration that New should be |
| /// merged with. |
| /// |
| /// Returns true if there was an error, false otherwise. |
| bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { |
| assert(!isa<OverloadedFunctionDecl>(OldD) && |
| "Cannot merge with an overloaded function declaration"); |
| |
| // Verify the old decl was also a function. |
| FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); |
| if (!Old) { |
| Diag(New->getLocation(), diag::err_redefinition_different_kind) |
| << New->getDeclName(); |
| Diag(OldD->getLocation(), diag::note_previous_definition); |
| return true; |
| } |
| |
| // Determine whether the previous declaration was a definition, |
| // implicit declaration, or a declaration. |
| diag::kind PrevDiag; |
| if (Old->isThisDeclarationADefinition()) |
| PrevDiag = diag::note_previous_definition; |
| else if (Old->isImplicit()) |
| PrevDiag = diag::note_previous_implicit_declaration; |
| else |
| PrevDiag = diag::note_previous_declaration; |
| |
| QualType OldQType = Context.getCanonicalType(Old->getType()); |
| QualType NewQType = Context.getCanonicalType(New->getType()); |
| |
| if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && |
| New->getStorageClass() == FunctionDecl::Static && |
| Old->getStorageClass() != FunctionDecl::Static) { |
| Diag(New->getLocation(), diag::err_static_non_static) |
| << New; |
| Diag(Old->getLocation(), PrevDiag); |
| return true; |
| } |
| |
| if (getLangOptions().CPlusPlus) { |
| // (C++98 13.1p2): |
| // Certain function declarations cannot be overloaded: |
| // -- Function declarations that differ only in the return type |
| // cannot be overloaded. |
| QualType OldReturnType |
| = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); |
| QualType NewReturnType |
| = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); |
| if (OldReturnType != NewReturnType) { |
| Diag(New->getLocation(), diag::err_ovl_diff_return_type); |
| Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); |
| return true; |
| } |
| |
| const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); |
| const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); |
| if (OldMethod && NewMethod && |
| OldMethod->getLexicalDeclContext() == |
| NewMethod->getLexicalDeclContext()) { |
| // -- Member function declarations with the same name and the |
| // same parameter types cannot be overloaded if any of them |
| // is a static member function declaration. |
| if (OldMethod->isStatic() || NewMethod->isStatic()) { |
| Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); |
| Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); |
| return true; |
| } |
| |
| // C++ [class.mem]p1: |
| // [...] A member shall not be declared twice in the |
| // member-specification, except that a nested class or member |
| // class template can be declared and then later defined. |
| unsigned NewDiag; |
| if (isa<CXXConstructorDecl>(OldMethod)) |
| NewDiag = diag::err_constructor_redeclared; |
| else if (isa<CXXDestructorDecl>(NewMethod)) |
| NewDiag = diag::err_destructor_redeclared; |
| else if (isa<CXXConversionDecl>(NewMethod)) |
| NewDiag = diag::err_conv_function_redeclared; |
| else |
| NewDiag = diag::err_member_redeclared; |
| |
| Diag(New->getLocation(), NewDiag); |
| Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); |
| } |
| |
| // (C++98 8.3.5p3): |
| // All declarations for a function shall agree exactly in both the |
| // return type and the parameter-type-list. |
| if (OldQType == NewQType) |
| return MergeCompatibleFunctionDecls(New, Old); |
| |
| // Fall through for conflicting redeclarations and redefinitions. |
| } |
| |
| // C: Function types need to be compatible, not identical. This handles |
| // duplicate function decls like "void f(int); void f(enum X);" properly. |
| if (!getLangOptions().CPlusPlus && |
| Context.typesAreCompatible(OldQType, NewQType)) { |
| const FunctionType *OldFuncType = OldQType->getAsFunctionType(); |
| const FunctionType *NewFuncType = NewQType->getAsFunctionType(); |
| const FunctionProtoType *OldProto = 0; |
| if (isa<FunctionNoProtoType>(NewFuncType) && |
| (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { |
| // The old declaration provided a function prototype, but the |
| // new declaration does not. Merge in the prototype. |
| assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); |
| llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), |
| OldProto->arg_type_end()); |
| NewQType = Context.getFunctionType(NewFuncType->getResultType(), |
| ParamTypes.data(), ParamTypes.size(), |
| OldProto->isVariadic(), |
| OldProto->getTypeQuals()); |
| New->setType(NewQType); |
| New->setHasInheritedPrototype(); |
| |
| // Synthesize a parameter for each argument type. |
| llvm::SmallVector<ParmVarDecl*, 16> Params; |
| for (FunctionProtoType::arg_type_iterator |
| ParamType = OldProto->arg_type_begin(), |
| ParamEnd = OldProto->arg_type_end(); |
| ParamType != ParamEnd; ++ParamType) { |
| ParmVarDecl *Param = ParmVarDecl::Create(Context, New, |
| SourceLocation(), 0, |
| *ParamType, VarDecl::None, |
| 0); |
| Param->setImplicit(); |
| Params.push_back(Param); |
| } |
| |
| New->setParams(Context, Params.data(), Params.size()); |
| } |
| |
| return MergeCompatibleFunctionDecls(New, Old); |
| } |
| |
| // GNU C permits a K&R definition to follow a prototype declaration |
| // if the declared types of the parameters in the K&R definition |
| // match the types in the prototype declaration, even when the |
| // promoted types of the parameters from the K&R definition differ |
| // from the types in the prototype. GCC then keeps the types from |
| // the prototype. |
| if (!getLangOptions().CPlusPlus && |
| Old->hasPrototype() && !New->hasPrototype() && |
| New->getType()->getAsFunctionProtoType() && |
| Old->getNumParams() == New->getNumParams()) { |
| llvm::SmallVector<QualType, 16> ArgTypes; |
| llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; |
| const FunctionProtoType *OldProto |
| = Old->getType()->getAsFunctionProtoType(); |
| const FunctionProtoType *NewProto |
| = New->getType()->getAsFunctionProtoType(); |
| |
| // Determine whether this is the GNU C extension. |
| bool GNUCompatible = |
| Context.typesAreCompatible(OldProto->getResultType(), |
| NewProto->getResultType()) && |
| (OldProto->isVariadic() == NewProto->isVariadic()); |
| for (unsigned Idx = 0, End = Old->getNumParams(); |
| GNUCompatible && Idx != End; ++Idx) { |
| ParmVarDecl *OldParm = Old->getParamDecl(Idx); |
| ParmVarDecl *NewParm = New->getParamDecl(Idx); |
| if (Context.typesAreCompatible(OldParm->getType(), |
| NewProto->getArgType(Idx))) { |
| ArgTypes.push_back(NewParm->getType()); |
| } else if (Context.typesAreCompatible(OldParm->getType(), |
| NewParm->getType())) { |
| GNUCompatibleParamWarning Warn |
| = { OldParm, NewParm, NewProto->getArgType(Idx) }; |
| Warnings.push_back(Warn); |
| ArgTypes.push_back(NewParm->getType()); |
| } else |
| GNUCompatible = false; |
| } |
| |
| if (GNUCompatible) { |
| for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { |
| Diag(Warnings[Warn].NewParm->getLocation(), |
| diag::ext_param_promoted_not_compatible_with_prototype) |
| << Warnings[Warn].PromotedType |
| << Warnings[Warn].OldParm->getType(); |
| Diag(Warnings[Warn].OldParm->getLocation(), |
| diag::note_previous_declaration); |
| } |
| |
| New->setType(Context.getFunctionType(NewProto->getResultType(), |
| &ArgTypes[0], ArgTypes.size(), |
| NewProto->isVariadic(), |
| NewProto->getTypeQuals())); |
| return MergeCompatibleFunctionDecls(New, Old); |
| } |
| |
| // Fall through to diagnose conflicting types. |
| } |
| |
| // A function that has already been declared has been redeclared or defined |
| // with a different type- show appropriate diagnostic |
| if (unsigned BuiltinID = Old->getBuiltinID(Context)) { |
| // The user has declared a builtin function with an incompatible |
| // signature. |
| if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { |
| // The function the user is redeclaring is a library-defined |
| // function like 'malloc' or 'printf'. Warn about the |
| // redeclaration, then pretend that we don't know about this |
| // library built-in. |
| Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; |
| Diag(Old->getLocation(), diag::note_previous_builtin_declaration) |
| << Old << Old->getType(); |
| New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); |
| Old->setInvalidDecl(); |
| return false; |
| } |
| |
| PrevDiag = diag::note_previous_builtin_declaration; |
| } |
| |
| Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); |
| Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); |
| return true; |
| } |
| |
| /// \brief Completes the merge of two function declarations that are |
| /// known to be compatible. |
| /// |
| /// This routine handles the merging of attributes and other |
| /// properties of function declarations form the old declaration to |
| /// the new declaration, once we know that New is in fact a |
| /// redeclaration of Old. |
| /// |
| /// \returns false |
| bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { |
| // Merge the attributes |
| MergeAttributes(New, Old, Context); |
| |
| // Merge the storage class. |
| if (Old->getStorageClass() != FunctionDecl::Extern) |
| New->setStorageClass(Old->getStorageClass()); |
| |
| // Merge "inline" |
| if (Old->isInline()) |
| New->setInline(true); |
| |
| // If this function declaration by itself qualifies as a C99 inline |
| // definition (C99 6.7.4p6), but the previous definition did not, |
| // then the function is not a C99 inline definition. |
| if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) |
| New->setC99InlineDefinition(false); |
| else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { |
| // Mark all preceding definitions as not being C99 inline definitions. |
| for (const FunctionDecl *Prev = Old; Prev; |
| Prev = Prev->getPreviousDeclaration()) |
| const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); |
| } |
| |
| // Merge "pure" flag. |
| if (Old->isPure()) |
| New->setPure(); |
| |
| // Merge the "deleted" flag. |
| if (Old->isDeleted()) |
| New->setDeleted(); |
| |
| if (getLangOptions().CPlusPlus) |
| return MergeCXXFunctionDecl(New, Old); |
| |
| return false; |
| } |
| |
| /// MergeVarDecl - We just parsed a variable 'New' which has the same name |
| /// and scope as a previous declaration 'Old'. Figure out how to resolve this |
| /// situation, merging decls or emitting diagnostics as appropriate. |
| /// |
| /// Tentative definition rules (C99 6.9.2p2) are checked by |
| /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative |
| /// definitions here, since the initializer hasn't been attached. |
| /// |
| void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { |
| // If either decl is invalid, make sure the new one is marked invalid and |
| // don't do any other checking. |
| if (New->isInvalidDecl() || OldD->isInvalidDecl()) |
| return New->setInvalidDecl(); |
| |
| // Verify the old decl was also a variable. |
| VarDecl *Old = dyn_cast<VarDecl>(OldD); |
| if (!Old) { |
| Diag(New->getLocation(), diag::err_redefinition_different_kind) |
| << New->getDeclName(); |
| Diag(OldD->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| MergeAttributes(New, Old, Context); |
| |
| // Merge the types |
| QualType MergedT; |
| if (getLangOptions().CPlusPlus) { |
| if (Context.hasSameType(New->getType(), Old->getType())) |
| MergedT = New->getType(); |
| } else { |
| MergedT = Context.mergeTypes(New->getType(), Old->getType()); |
| } |
| if (MergedT.isNull()) { |
| Diag(New->getLocation(), diag::err_redefinition_different_type) |
| << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| New->setType(MergedT); |
| |
| // C99 6.2.2p4: Check if we have a static decl followed by a non-static. |
| if (New->getStorageClass() == VarDecl::Static && |
| (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { |
| Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| // C99 6.2.2p4: |
| // For an identifier declared with the storage-class specifier |
| // extern in a scope in which a prior declaration of that |
| // identifier is visible,23) if the prior declaration specifies |
| // internal or external linkage, the linkage of the identifier at |
| // the later declaration is the same as the linkage specified at |
| // the prior declaration. If no prior declaration is visible, or |
| // if the prior declaration specifies no linkage, then the |
| // identifier has external linkage. |
| if (New->hasExternalStorage() && Old->hasLinkage()) |
| /* Okay */; |
| else if (New->getStorageClass() != VarDecl::Static && |
| Old->getStorageClass() == VarDecl::Static) { |
| Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. |
| |
| // FIXME: The test for external storage here seems wrong? We still |
| // need to check for mismatches. |
| if (!New->hasExternalStorage() && !New->isFileVarDecl() && |
| // Don't complain about out-of-line definitions of static members. |
| !(Old->getLexicalDeclContext()->isRecord() && |
| !New->getLexicalDeclContext()->isRecord())) { |
| Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| return New->setInvalidDecl(); |
| } |
| |
| if (New->isThreadSpecified() && !Old->isThreadSpecified()) { |
| Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { |
| Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); |
| Diag(Old->getLocation(), diag::note_previous_definition); |
| } |
| |
| // Keep a chain of previous declarations. |
| New->setPreviousDeclaration(Old); |
| } |
| |
| /// CheckParmsForFunctionDef - Check that the parameters of the given |
| /// function are appropriate for the definition of a function. This |
| /// takes care of any checks that cannot be performed on the |
| /// declaration itself, e.g., that the types of each of the function |
| /// parameters are complete. |
| bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { |
| bool HasInvalidParm = false; |
| for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { |
| ParmVarDecl *Param = FD->getParamDecl(p); |
| |
| // C99 6.7.5.3p4: the parameters in a parameter type list in a |
| // function declarator that is part of a function definition of |
| // that function shall not have incomplete type. |
| // |
| // This is also C++ [dcl.fct]p6. |
| if (!Param->isInvalidDecl() && |
| RequireCompleteType(Param->getLocation(), Param->getType(), |
| diag::err_typecheck_decl_incomplete_type)) { |
| Param->setInvalidDecl(); |
| HasInvalidParm = true; |
| } |
| |
| // C99 6.9.1p5: If the declarator includes a parameter type list, the |
| // declaration of each parameter shall include an identifier. |
| if (Param->getIdentifier() == 0 && |
| !Param->isImplicit() && |
| !getLangOptions().CPlusPlus) |
| Diag(Param->getLocation(), diag::err_parameter_name_omitted); |
| } |
| |
| return HasInvalidParm; |
| } |
| |
| /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with |
| /// no declarator (e.g. "struct foo;") is parsed. |
| Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { |
| // FIXME: Error on auto/register at file scope |
| // FIXME: Error on inline/virtual/explicit |
| // FIXME: Error on invalid restrict |
| // FIXME: Warn on useless __thread |
| // FIXME: Warn on useless const/volatile |
| // FIXME: Warn on useless static/extern/typedef/private_extern/mutable |
| // FIXME: Warn on useless attributes |
| TagDecl *Tag = 0; |
| if (DS.getTypeSpecType() == DeclSpec::TST_class || |
| DS.getTypeSpecType() == DeclSpec::TST_struct || |
| DS.getTypeSpecType() == DeclSpec::TST_union || |
| DS.getTypeSpecType() == DeclSpec::TST_enum) { |
| if (!DS.getTypeRep()) // We probably had an error |
| return DeclPtrTy(); |
| |
| Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); |
| } |
| |
| if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { |
| if (!Record->getDeclName() && Record->isDefinition() && |
| DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { |
| if (getLangOptions().CPlusPlus || |
| Record->getDeclContext()->isRecord()) |
| return BuildAnonymousStructOrUnion(S, DS, Record); |
| |
| Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) |
| << DS.getSourceRange(); |
| } |
| |
| // Microsoft allows unnamed struct/union fields. Don't complain |
| // about them. |
| // FIXME: Should we support Microsoft's extensions in this area? |
| if (Record->getDeclName() && getLangOptions().Microsoft) |
| return DeclPtrTy::make(Tag); |
| } |
| |
| if (!DS.isMissingDeclaratorOk() && |
| DS.getTypeSpecType() != DeclSpec::TST_error) { |
| // Warn about typedefs of enums without names, since this is an |
| // extension in both Microsoft an GNU. |
| if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && |
| Tag && isa<EnumDecl>(Tag)) { |
| Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) |
| << DS.getSourceRange(); |
| return DeclPtrTy::make(Tag); |
| } |
| |
| Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) |
| << DS.getSourceRange(); |
| return DeclPtrTy(); |
| } |
| |
| return DeclPtrTy::make(Tag); |
| } |
| |
| /// InjectAnonymousStructOrUnionMembers - Inject the members of the |
| /// anonymous struct or union AnonRecord into the owning context Owner |
| /// and scope S. This routine will be invoked just after we realize |
| /// that an unnamed union or struct is actually an anonymous union or |
| /// struct, e.g., |
| /// |
| /// @code |
| /// union { |
| /// int i; |
| /// float f; |
| /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and |
| /// // f into the surrounding scope.x |
| /// @endcode |
| /// |
| /// This routine is recursive, injecting the names of nested anonymous |
| /// structs/unions into the owning context and scope as well. |
| bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, |
| RecordDecl *AnonRecord) { |
| bool Invalid = false; |
| for (RecordDecl::field_iterator F = AnonRecord->field_begin(Context), |
| FEnd = AnonRecord->field_end(Context); |
| F != FEnd; ++F) { |
| if ((*F)->getDeclName()) { |
| NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), |
| LookupOrdinaryName, true); |
| if (PrevDecl && !isa<TagDecl>(PrevDecl)) { |
| // C++ [class.union]p2: |
| // The names of the members of an anonymous union shall be |
| // distinct from the names of any other entity in the |
| // scope in which the anonymous union is declared. |
| unsigned diagKind |
| = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl |
| : diag::err_anonymous_struct_member_redecl; |
| Diag((*F)->getLocation(), diagKind) |
| << (*F)->getDeclName(); |
| Diag(PrevDecl->getLocation(), diag::note_previous_declaration); |
| Invalid = true; |
| } else { |
| // C++ [class.union]p2: |
| // For the purpose of name lookup, after the anonymous union |
| // definition, the members of the anonymous union are |
| // considered to have been defined in the scope in which the |
| // anonymous union is declared. |
| Owner->makeDeclVisibleInContext(Context, *F); |
| S->AddDecl(DeclPtrTy::make(*F)); |
| IdResolver.AddDecl(*F); |
| } |
| } else if (const RecordType *InnerRecordType |
| = (*F)->getType()->getAsRecordType()) { |
| RecordDecl *InnerRecord = InnerRecordType->getDecl(); |
| if (InnerRecord->isAnonymousStructOrUnion()) |
| Invalid = Invalid || |
| InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); |
| } |
| } |
| |
| return Invalid; |
| } |
| |
| /// ActOnAnonymousStructOrUnion - Handle the declaration of an |
| /// anonymous structure or union. Anonymous unions are a C++ feature |
| /// (C++ [class.union]) and a GNU C extension; anonymous structures |
| /// are a GNU C and GNU C++ extension. |
| Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, |
| RecordDecl *Record) { |
| DeclContext *Owner = Record->getDeclContext(); |
| |
| // Diagnose whether this anonymous struct/union is an extension. |
| if (Record->isUnion() && !getLangOptions().CPlusPlus) |
| Diag(Record->getLocation(), diag::ext_anonymous_union); |
| else if (!Record->isUnion()) |
| Diag(Record->getLocation(), diag::ext_anonymous_struct); |
| |
| // C and C++ require different kinds of checks for anonymous |
| // structs/unions. |
| bool Invalid = false; |
| if (getLangOptions().CPlusPlus) { |
| const char* PrevSpec = 0; |
| // C++ [class.union]p3: |
| // Anonymous unions declared in a named namespace or in the |
| // global namespace shall be declared static. |
| if (DS.getStorageClassSpec() != DeclSpec::SCS_static && |
| (isa<TranslationUnitDecl>(Owner) || |
| (isa<NamespaceDecl>(Owner) && |
| cast<NamespaceDecl>(Owner)->getDeclName()))) { |
| Diag(Record->getLocation(), diag::err_anonymous_union_not_static); |
| Invalid = true; |
| |
| // Recover by adding 'static'. |
| DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); |
| } |
| // C++ [class.union]p3: |
| // A storage class is not allowed in a declaration of an |
| // anonymous union in a class scope. |
| else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && |
| isa<RecordDecl>(Owner)) { |
| Diag(DS.getStorageClassSpecLoc(), |
| diag::err_anonymous_union_with_storage_spec); |
| Invalid = true; |
| |
| // Recover by removing the storage specifier. |
| DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), |
| PrevSpec); |
| } |
| |
| // C++ [class.union]p2: |
| // The member-specification of an anonymous union shall only |
| // define non-static data members. [Note: nested types and |
| // functions cannot be declared within an anonymous union. ] |
| for (DeclContext::decl_iterator Mem = Record->decls_begin(Context), |
| MemEnd = Record->decls_end(Context); |
| Mem != MemEnd; ++Mem) { |
| if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { |
| // C++ [class.union]p3: |
| // An anonymous union shall not have private or protected |
| // members (clause 11). |
| if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { |
| Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) |
| << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); |
| Invalid = true; |
| } |
| } else if ((*Mem)->isImplicit()) { |
| // Any implicit members are fine. |
| } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { |
| // This is a type that showed up in an |
| // elaborated-type-specifier inside the anonymous struct or |
| // union, but which actually declares a type outside of the |
| // anonymous struct or union. It's okay. |
| } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { |
| if (!MemRecord->isAnonymousStructOrUnion() && |
| MemRecord->getDeclName()) { |
| // This is a nested type declaration. |
| Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) |
| << (int)Record->isUnion(); |
| Invalid = true; |
| } |
| } else { |
| // We have something that isn't a non-static data |
| // member. Complain about it. |
| unsigned DK = diag::err_anonymous_record_bad_member; |
| if (isa<TypeDecl>(*Mem)) |
| DK = diag::err_anonymous_record_with_type; |
| else if (isa<FunctionDecl>(*Mem)) |
| DK = diag::err_anonymous_record_with_function; |
| else if (isa<VarDecl>(*Mem)) |
| DK = diag::err_anonymous_record_with_static; |
| Diag((*Mem)->getLocation(), DK) |
| << (int)Record->isUnion(); |
| Invalid = true; |
| } |
| } |
| } |
| |
| if (!Record->isUnion() && !Owner->isRecord()) { |
| Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) |
| << (int)getLangOptions().CPlusPlus; |
| Invalid = true; |
| } |
| |
| // Create a declaration for this anonymous struct/union. |
| NamedDecl *Anon = 0; |
| if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { |
| Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), |
| /*IdentifierInfo=*/0, |
| Context.getTypeDeclType(Record), |
| /*BitWidth=*/0, /*Mutable=*/false); |
| Anon->setAccess(AS_public); |
| if (getLangOptions().CPlusPlus) |
| FieldCollector->Add(cast<FieldDecl>(Anon)); |
| } else { |
| VarDecl::StorageClass SC; |
| switch (DS.getStorageClassSpec()) { |
| default: assert(0 && "Unknown storage class!"); |
| case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; |
| case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; |
| case DeclSpec::SCS_static: SC = VarDecl::Static; break; |
| case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; |
| case DeclSpec::SCS_register: SC = VarDecl::Register; break; |
| case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; |
| case DeclSpec::SCS_mutable: |
| // mutable can only appear on non-static class members, so it's always |
| // an error here |
| Diag(Record->getLocation(), diag::err_mutable_nonmember); |
| Invalid = true; |
| SC = VarDecl::None; |
| break; |
| } |
| |
| Anon = VarDecl::Create(Context, Owner, Record->getLocation(), |
| /*IdentifierInfo=*/0, |
| Context.getTypeDeclType(Record), |
| SC, DS.getSourceRange().getBegin()); |
| } |
| Anon->setImplicit(); |
| |
| // Add the anonymous struct/union object to the current |
| // context. We'll be referencing this object when we refer to one of |
| // its members. |
| Owner->addDecl(Context, Anon); |
| |
| // Inject the members of the anonymous struct/union into the owning |
| // context and into the identifier resolver chain for name lookup |
| // purposes. |
| if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) |
| Invalid = true; |
| |
| // Mark this as an anonymous struct/union type. Note that we do not |
| // do this until after we have already checked and injected the |
| // members of this anonymous struct/union type, because otherwise |
| // the members could be injected twice: once by DeclContext when it |
| // builds its lookup table, and once by |
| // InjectAnonymousStructOrUnionMembers. |
| Record->setAnonymousStructOrUnion(true); |
| |
| if (Invalid) |
| Anon->setInvalidDecl(); |
| |
| return DeclPtrTy::make(Anon); |
| } |
| |
| |
| /// GetNameForDeclarator - Determine the full declaration name for the |
| /// given Declarator. |
| DeclarationName Sema::GetNameForDeclarator(Declarator &D) { |
| switch (D.getKind()) { |
| case Declarator::DK_Abstract: |
| assert(D.getIdentifier() == 0 && "abstract declarators have no name"); |
| return DeclarationName(); |
| |
| case Declarator::DK_Normal: |
| assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); |
| return DeclarationName(D.getIdentifier()); |
| |
| case Declarator::DK_Constructor: { |
| QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); |
| Ty = Context.getCanonicalType(Ty); |
| return Context.DeclarationNames.getCXXConstructorName(Ty); |
| } |
| |
| case Declarator::DK_Destructor: { |
| QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); |
| Ty = Context.getCanonicalType(Ty); |
| return Context.DeclarationNames.getCXXDestructorName(Ty); |
| } |
| |
| case Declarator::DK_Conversion: { |
| // FIXME: We'd like to keep the non-canonical type for diagnostics! |
| QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); |
| Ty = Context.getCanonicalType(Ty); |
| return Context.DeclarationNames.getCXXConversionFunctionName(Ty); |
| } |
| |
| case Declarator::DK_Operator: |
| assert(D.getIdentifier() == 0 && "operator names have no identifier"); |
| return Context.DeclarationNames.getCXXOperatorName( |
| D.getOverloadedOperator()); |
| } |
| |
| assert(false && "Unknown name kind"); |
| return DeclarationName(); |
| } |
| |
| /// isNearlyMatchingFunction - Determine whether the C++ functions |
| /// Declaration and Definition are "nearly" matching. This heuristic |
| /// is used to improve diagnostics in the case where an out-of-line |
| /// function definition doesn't match any declaration within |
| /// the class or namespace. |
| static bool isNearlyMatchingFunction(ASTContext &Context, |
| FunctionDecl *Declaration, |
| FunctionDecl *Definition) { |
| if (Declaration->param_size() != Definition->param_size()) |
| return false; |
| for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { |
| QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); |
| QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); |
| |
| DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); |
| DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); |
| if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| Sema::DeclPtrTy |
| Sema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { |
| DeclarationName Name = GetNameForDeclarator(D); |
| |
| // All of these full declarators require an identifier. If it doesn't have |
| // one, the ParsedFreeStandingDeclSpec action should be used. |
| if (!Name) { |
| if (!D.isInvalidType()) // Reject this if we think it is valid. |
| Diag(D.getDeclSpec().getSourceRange().getBegin(), |
| diag::err_declarator_need_ident) |
| << D.getDeclSpec().getSourceRange() << D.getSourceRange(); |
| return DeclPtrTy(); |
| } |
| |
| // The scope passed in may not be a decl scope. Zip up the scope tree until |
| // we find one that is. |
| while ((S->getFlags() & Scope::DeclScope) == 0 || |
| (S->getFlags() & Scope::TemplateParamScope) != 0) |
| S = S->getParent(); |
| |
| DeclContext *DC; |
| NamedDecl *PrevDecl; |
| NamedDecl *New; |
| |
| QualType R = GetTypeForDeclarator(D, S); |
| |
| // See if this is a redefinition of a variable in the same scope. |
| if (D.getCXXScopeSpec().isInvalid()) { |
| DC = CurContext; |
| PrevDecl = 0; |
| D.setInvalidType(); |
| } else if (!D.getCXXScopeSpec().isSet()) { |
| LookupNameKind NameKind = LookupOrdinaryName; |
| |
| // If the declaration we're planning to build will be a function |
| // or object with linkage, then look for another declaration with |
| // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). |
| if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) |
| /* Do nothing*/; |
| else if (R->isFunctionType()) { |
| if (CurContext->isFunctionOrMethod()) |
| NameKind = LookupRedeclarationWithLinkage; |
| } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) |
| NameKind = LookupRedeclarationWithLinkage; |
| |
| DC = CurContext; |
| PrevDecl = LookupName(S, Name, NameKind, true, |
| D.getDeclSpec().getStorageClassSpec() != |
| DeclSpec::SCS_static, |
| D.getIdentifierLoc()); |
| } else { // Something like "int foo::x;" |
| DC = computeDeclContext(D.getCXXScopeSpec()); |
| // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? |
| PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); |
| |
| // C++ 7.3.1.2p2: |
| // Members (including explicit specializations of templates) of a named |
| // namespace can also be defined outside that namespace by explicit |
| // qualification of the name being defined, provided that the entity being |
| // defined was already declared in the namespace and the definition appears |
| // after the point of declaration in a namespace that encloses the |
| // declarations namespace. |
| // |
| // Note that we only check the context at this point. We don't yet |
| // have enough information to make sure that PrevDecl is actually |
| // the declaration we want to match. For example, given: |
| // |
| // class X { |
| // void f(); |
| // void f(float); |
| // }; |
| // |
| // void X::f(int) { } // ill-formed |
| // |
| // In this case, PrevDecl will point to the overload set |
| // containing the two f's declared in X, but neither of them |
| // matches. |
| |
| // First check whether we named the global scope. |
| if (isa<TranslationUnitDecl>(DC)) { |
| Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) |
| << Name << D.getCXXScopeSpec().getRange(); |
| } else if (!CurContext->Encloses(DC)) { |
| // The qualifying scope doesn't enclose the original declaration. |
| // Emit diagnostic based on current scope. |
| SourceLocation L = D.getIdentifierLoc(); |
| SourceRange R = D.getCXXScopeSpec().getRange(); |
| if (isa<FunctionDecl>(CurContext)) |
| Diag(L, diag::err_invalid_declarator_in_function) << Name << R; |
| else |
| Diag(L, diag::err_invalid_declarator_scope) |
| << Name << cast<NamedDecl>(DC) << R; |
| D.setInvalidType(); |
| } |
| } |
| |
| if (PrevDecl && PrevDecl->isTemplateParameter()) { |
| // Maybe we will complain about the shadowed template parameter. |
| if (!D.isInvalidType()) |
| if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) |
| D.setInvalidType(); |
| |
| // Just pretend that we didn't see the previous declaration. |
| PrevDecl = 0; |
| } |
| |
| // In C++, the previous declaration we find might be a tag type |
| // (class or enum). In this case, the new declaration will hide the |
| // tag type. Note that this does does not apply if we're declaring a |
| // typedef (C++ [dcl.typedef]p4). |
| if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && |
| D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) |
| PrevDecl = 0; |
| |
| bool Redeclaration = false; |
| if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { |
| New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); |
| } else if (R->isFunctionType()) { |
| New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, |
| IsFunctionDefinition, Redeclaration); |
| } else { |
| New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, Redeclaration); |
| } |
| |
| if (New == 0) |
| return DeclPtrTy(); |
| |
| // If this has an identifier and is not an invalid redeclaration, |
| // add it to the scope stack. |
| if (Name && !(Redeclaration && New->isInvalidDecl())) |
| PushOnScopeChains(New, S); |
| |
| return DeclPtrTy::make(New); |
| } |
| |
| /// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array |
| /// types into constant array types in certain situations which would otherwise |
| /// be errors (for GCC compatibility). |
| static QualType TryToFixInvalidVariablyModifiedType(QualType T, |
| ASTContext &Context, |
| bool &SizeIsNegative) { |
| // This method tries to turn a variable array into a constant |
| // array even when the size isn't an ICE. This is necessary |
| // for compatibility with code that depends on gcc's buggy |
| // constant expression folding, like struct {char x[(int)(char*)2];} |
| SizeIsNegative = false; |
| |
| if (const PointerType* PTy = dyn_cast<PointerType>(T)) { |
| QualType Pointee = PTy->getPointeeType(); |
| QualType FixedType = |
| TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); |
| if (FixedType.isNull()) return FixedType; |
| FixedType = Context.getPointerType(FixedType); |
| FixedType.setCVRQualifiers(T.getCVRQualifiers()); |
| return FixedType; |
| } |
| |
| const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); |
| if (!VLATy) |
| return QualType(); |
| // FIXME: We should probably handle this case |
| if (VLATy->getElementType()->isVariablyModifiedType()) |
| return QualType(); |
| |
| Expr::EvalResult EvalResult; |
| if (!VLATy->getSizeExpr() || |
| !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || |
| !EvalResult.Val.isInt()) |
| return QualType(); |
| |
| llvm::APSInt &Res = EvalResult.Val.getInt(); |
| if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) |
| return Context.getConstantArrayType(VLATy->getElementType(), |
| Res, ArrayType::Normal, 0); |
| |
| SizeIsNegative = true; |
| return QualType(); |
| } |
| |
| /// \brief Register the given locally-scoped external C declaration so |
| /// that it can be found later for redeclarations |
| void |
| Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, |
| Scope *S) { |
| assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && |
| "Decl is not a locally-scoped decl!"); |
| // Note that we have a locally-scoped external with this name. |
| LocallyScopedExternalDecls[ND->getDeclName()] = ND; |
| |
| if (!PrevDecl) |
| return; |
| |
| // If there was a previous declaration of this variable, it may be |
| // in our identifier chain. Update the identifier chain with the new |
| // declaration. |
| if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { |
| // The previous declaration was found on the identifer resolver |
| // chain, so remove it from its scope. |
| while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) |
| S = S->getParent(); |
| |
| if (S) |
| S->RemoveDecl(DeclPtrTy::make(PrevDecl)); |
| } |
| } |
| |
| /// \brief Diagnose function specifiers on a declaration of an identifier that |
| /// does not identify a function. |
| void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { |
| // FIXME: We should probably indicate the identifier in question to avoid |
| // confusion for constructs like "inline int a(), b;" |
| if (D.getDeclSpec().isInlineSpecified()) |
| Diag(D.getDeclSpec().getInlineSpecLoc(), |
| diag::err_inline_non_function); |
| |
| if (D.getDeclSpec().isVirtualSpecified()) |
| Diag(D.getDeclSpec().getVirtualSpecLoc(), |
| diag::err_virtual_non_function); |
| |
| if (D.getDeclSpec().isExplicitSpecified()) |
| Diag(D.getDeclSpec().getExplicitSpecLoc(), |
| diag::err_explicit_non_function); |
| } |
| |
| NamedDecl* |
| Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, |
| QualType R, Decl* PrevDecl, bool &Redeclaration) { |
| // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). |
| if (D.getCXXScopeSpec().isSet()) { |
| Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) |
| << D.getCXXScopeSpec().getRange(); |
| D.setInvalidType(); |
| // Pretend we didn't see the scope specifier. |
| DC = 0; |
| } |
| |
| if (getLangOptions().CPlusPlus) { |
| // Check that there are no default arguments (C++ only). |
| CheckExtraCXXDefaultArguments(D); |
| } |
| |
| DiagnoseFunctionSpecifiers(D); |
| |
| if (D.getDeclSpec().isThreadSpecified()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); |
| |
| TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); |
| if (!NewTD) return 0; |
| |
| if (D.isInvalidType()) |
| NewTD->setInvalidDecl(); |
| |
| // Handle attributes prior to checking for duplicates in MergeVarDecl |
| ProcessDeclAttributes(NewTD, D); |
| // Merge the decl with the existing one if appropriate. If the decl is |
| // in an outer scope, it isn't the same thing. |
| if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { |
| Redeclaration = true; |
| MergeTypeDefDecl(NewTD, PrevDecl); |
| } |
| |
| // C99 6.7.7p2: If a typedef name specifies a variably modified type |
| // then it shall have block scope. |
| QualType T = NewTD->getUnderlyingType(); |
| if (T->isVariablyModifiedType()) { |
| CurFunctionNeedsScopeChecking = true; |
| |
| if (S->getFnParent() == 0) { |
| bool SizeIsNegative; |
| QualType FixedTy = |
| TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); |
| if (!FixedTy.isNull()) { |
| Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); |
| NewTD->setUnderlyingType(FixedTy); |
| } else { |
| if (SizeIsNegative) |
| Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); |
| else if (T->isVariableArrayType()) |
| Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); |
| else |
| Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); |
| NewTD->setInvalidDecl(); |
| } |
| } |
| } |
| return NewTD; |
| } |
| |
| /// \brief Determines whether the given declaration is an out-of-scope |
| /// previous declaration. |
| /// |
| /// This routine should be invoked when name lookup has found a |
| /// previous declaration (PrevDecl) that is not in the scope where a |
| /// new declaration by the same name is being introduced. If the new |
| /// declaration occurs in a local scope, previous declarations with |
| /// linkage may still be considered previous declarations (C99 |
| /// 6.2.2p4-5, C++ [basic.link]p6). |
| /// |
| /// \param PrevDecl the previous declaration found by name |
| /// lookup |
| /// |
| /// \param DC the context in which the new declaration is being |
| /// declared. |
| /// |
| /// \returns true if PrevDecl is an out-of-scope previous declaration |
| /// for a new delcaration with the same name. |
| static bool |
| isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, |
| ASTContext &Context) { |
| if (!PrevDecl) |
| return 0; |
| |
| // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which |
| // case we need to check each of the overloaded functions. |
| if (!PrevDecl->hasLinkage()) |
| return false; |
| |
| if (Context.getLangOptions().CPlusPlus) { |
| // C++ [basic.link]p6: |
| // If there is a visible declaration of an entity with linkage |
| // having the same name and type, ignoring entities declared |
| // outside the innermost enclosing namespace scope, the block |
| // scope declaration declares that same entity and receives the |
| // linkage of the previous declaration. |
| DeclContext *OuterContext = DC->getLookupContext(); |
| if (!OuterContext->isFunctionOrMethod()) |
| // This rule only applies to block-scope declarations. |
| return false; |
| else { |
| DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); |
| if (PrevOuterContext->isRecord()) |
| // We found a member function: ignore it. |
| return false; |
| else { |
| // Find the innermost enclosing namespace for the new and |
| // previous declarations. |
| while (!OuterContext->isFileContext()) |
| OuterContext = OuterContext->getParent(); |
| while (!PrevOuterContext->isFileContext()) |
| PrevOuterContext = PrevOuterContext->getParent(); |
| |
| // The previous declaration is in a different namespace, so it |
| // isn't the same function. |
| if (OuterContext->getPrimaryContext() != |
| PrevOuterContext->getPrimaryContext()) |
| return false; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| NamedDecl* |
| Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, |
| QualType R,NamedDecl* PrevDecl, |
| bool &Redeclaration) { |
| DeclarationName Name = GetNameForDeclarator(D); |
| |
| // Check that there are no default arguments (C++ only). |
| if (getLangOptions().CPlusPlus) |
| CheckExtraCXXDefaultArguments(D); |
| |
| VarDecl *NewVD; |
| VarDecl::StorageClass SC; |
| switch (D.getDeclSpec().getStorageClassSpec()) { |
| default: assert(0 && "Unknown storage class!"); |
| case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; |
| case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; |
| case DeclSpec::SCS_static: SC = VarDecl::Static; break; |
| case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; |
| case DeclSpec::SCS_register: SC = VarDecl::Register; break; |
| case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; |
| case DeclSpec::SCS_mutable: |
| // mutable can only appear on non-static class members, so it's always |
| // an error here |
| Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); |
| D.setInvalidType(); |
| SC = VarDecl::None; |
| break; |
| } |
| |
| IdentifierInfo *II = Name.getAsIdentifierInfo(); |
| if (!II) { |
| Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) |
| << Name.getAsString(); |
| return 0; |
| } |
| |
| DiagnoseFunctionSpecifiers(D); |
| |
| if (!DC->isRecord() && S->getFnParent() == 0) { |
| // C99 6.9p2: The storage-class specifiers auto and register shall not |
| // appear in the declaration specifiers in an external declaration. |
| if (SC == VarDecl::Auto || SC == VarDecl::Register) { |
| |
| // If this is a register variable with an asm label specified, then this |
| // is a GNU extension. |
| if (SC == VarDecl::Register && D.getAsmLabel()) |
| Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); |
| else |
| Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); |
| D.setInvalidType(); |
| } |
| } |
| if (DC->isRecord() && !CurContext->isRecord()) { |
| // This is an out-of-line definition of a static data member. |
| if (SC == VarDecl::Static) { |
| Diag(D.getDeclSpec().getStorageClassSpecLoc(), |
| diag::err_static_out_of_line) |
| << CodeModificationHint::CreateRemoval( |
| SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); |
| } else if (SC == VarDecl::None) |
| SC = VarDecl::Static; |
| } |
| |
| // The variable can not |
| NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), |
| II, R, SC, |
| // FIXME: Move to DeclGroup... |
| D.getDeclSpec().getSourceRange().getBegin()); |
| |
| if (D.isInvalidType()) |
| NewVD->setInvalidDecl(); |
| |
| if (D.getDeclSpec().isThreadSpecified()) { |
| if (NewVD->hasLocalStorage()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); |
| else if (!Context.Target.isTLSSupported()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); |
| else |
| NewVD->setThreadSpecified(true); |
| } |
| |
| // Set the lexical context. If the declarator has a C++ scope specifier, the |
| // lexical context will be different from the semantic context. |
| NewVD->setLexicalDeclContext(CurContext); |
| |
| // Handle attributes prior to checking for duplicates in MergeVarDecl |
| ProcessDeclAttributes(NewVD, D); |
| |
| // Handle GNU asm-label extension (encoded as an attribute). |
| if (Expr *E = (Expr*) D.getAsmLabel()) { |
| // The parser guarantees this is a string. |
| StringLiteral *SE = cast<StringLiteral>(E); |
| NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), |
| SE->getByteLength()))); |
| } |
| |
| // If name lookup finds a previous declaration that is not in the |
| // same scope as the new declaration, this may still be an |
| // acceptable redeclaration. |
| if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && |
| !(NewVD->hasLinkage() && |
| isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) |
| PrevDecl = 0; |
| |
| // Merge the decl with the existing one if appropriate. |
| if (PrevDecl) { |
| if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { |
| // The user tried to define a non-static data member |
| // out-of-line (C++ [dcl.meaning]p1). |
| Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) |
| << D.getCXXScopeSpec().getRange(); |
| PrevDecl = 0; |
| NewVD->setInvalidDecl(); |
| } |
| } else if (D.getCXXScopeSpec().isSet()) { |
| // No previous declaration in the qualifying scope. |
| Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) |
| << Name << D.getCXXScopeSpec().getRange(); |
| NewVD->setInvalidDecl(); |
| } |
| |
| CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); |
| |
| // If this is a locally-scoped extern C variable, update the map of |
| // such variables. |
| if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && |
| !NewVD->isInvalidDecl()) |
| RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); |
| |
| return NewVD; |
| } |
| |
| /// \brief Perform semantic checking on a newly-created variable |
| /// declaration. |
| /// |
| /// This routine performs all of the type-checking required for a |
| /// variable declaration once it has been built. It is used both to |
| /// check variables after they have been parsed and their declarators |
| /// have been translated into a declaration, and to check variables |
| /// that have been instantiated from a template. |
| /// |
| /// Sets NewVD->isInvalidDecl() if an error was encountered. |
| void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, |
| bool &Redeclaration) { |
| // If the decl is already known invalid, don't check it. |
| if (NewVD->isInvalidDecl()) |
| return; |
| |
| QualType T = NewVD->getType(); |
| |
| if (T->isObjCInterfaceType()) { |
| Diag(NewVD->getLocation(), diag::err_statically_allocated_object); |
| return NewVD->setInvalidDecl(); |
| } |
| |
| // The variable can not have an abstract class type. |
| if (RequireNonAbstractType(NewVD->getLocation(), T, |
| diag::err_abstract_type_in_decl, |
| AbstractVariableType)) |
| return NewVD->setInvalidDecl(); |
| |
| // Emit an error if an address space was applied to decl with local storage. |
| // This includes arrays of objects with address space qualifiers, but not |
| // automatic variables that point to other address spaces. |
| // ISO/IEC TR 18037 S5.1.2 |
| if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { |
| Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); |
| return NewVD->setInvalidDecl(); |
| } |
| |
| if (NewVD->hasLocalStorage() && T.isObjCGCWeak() |
| && !NewVD->hasAttr<BlocksAttr>()) |
| Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); |
| |
| bool isVM = T->isVariablyModifiedType(); |
| if (isVM || NewVD->hasAttr<CleanupAttr>()) |
| CurFunctionNeedsScopeChecking = true; |
| |
| if ((isVM && NewVD->hasLinkage()) || |
| (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { |
| bool SizeIsNegative; |
| QualType FixedTy = |
| TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); |
| |
| if (FixedTy.isNull() && T->isVariableArrayType()) { |
| const VariableArrayType *VAT = Context.getAsVariableArrayType(T); |
| // FIXME: This won't give the correct result for |
| // int a[10][n]; |
| SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); |
| |
| if (NewVD->isFileVarDecl()) |
| Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) |
| << SizeRange; |
| else if (NewVD->getStorageClass() == VarDecl::Static) |
| Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) |
| << SizeRange; |
| else |
| Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) |
| << SizeRange; |
| return NewVD->setInvalidDecl(); |
| } |
| |
| if (FixedTy.isNull()) { |
| if (NewVD->isFileVarDecl()) |
| Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); |
| else |
| Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); |
| return NewVD->setInvalidDecl(); |
| } |
| |
| Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); |
| NewVD->setType(FixedTy); |
| } |
| |
| if (!PrevDecl && NewVD->isExternC(Context)) { |
| // Since we did not find anything by this name and we're declaring |
| // an extern "C" variable, look for a non-visible extern "C" |
| // declaration with the same name. |
| llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos |
| = LocallyScopedExternalDecls.find(NewVD->getDeclName()); |
| if (Pos != LocallyScopedExternalDecls.end()) |
| PrevDecl = Pos->second; |
| } |
| |
| if (T->isVoidType() && !NewVD->hasExternalStorage()) { |
| Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) |
| << T; |
| return NewVD->setInvalidDecl(); |
| } |
| |
| if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { |
| Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); |
| return NewVD->setInvalidDecl(); |
| } |
| |
| if (isVM && NewVD->hasAttr<BlocksAttr>()) { |
| Diag(NewVD->getLocation(), diag::err_block_on_vm); |
| return NewVD->setInvalidDecl(); |
| } |
| |
| if (PrevDecl) { |
| Redeclaration = true; |
| MergeVarDecl(NewVD, PrevDecl); |
| } |
| } |
| |
| NamedDecl* |
| Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, |
| QualType R, NamedDecl* PrevDecl, |
| bool IsFunctionDefinition, bool &Redeclaration) { |
| assert(R.getTypePtr()->isFunctionType()); |
| |
| DeclarationName Name = GetNameForDeclarator(D); |
| FunctionDecl::StorageClass SC = FunctionDecl::None; |
| switch (D.getDeclSpec().getStorageClassSpec()) { |
| default: assert(0 && "Unknown storage class!"); |
| case DeclSpec::SCS_auto: |
| case DeclSpec::SCS_register: |
| case DeclSpec::SCS_mutable: |
| Diag(D.getDeclSpec().getStorageClassSpecLoc(), |
| diag::err_typecheck_sclass_func); |
| D.setInvalidType(); |
| break; |
| case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; |
| case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; |
| case DeclSpec::SCS_static: { |
| if (CurContext->getLookupContext()->isFunctionOrMethod()) { |
| // C99 6.7.1p5: |
| // The declaration of an identifier for a function that has |
| // block scope shall have no explicit storage-class specifier |
| // other than extern |
| // See also (C++ [dcl.stc]p4). |
| Diag(D.getDeclSpec().getStorageClassSpecLoc(), |
| diag::err_static_block_func); |
| SC = FunctionDecl::None; |
| } else |
| SC = FunctionDecl::Static; |
| break; |
| } |
| case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; |
| } |
| |
| if (D.getDeclSpec().isThreadSpecified()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); |
| |
| bool isInline = D.getDeclSpec().isInlineSpecified(); |
| bool isVirtual = D.getDeclSpec().isVirtualSpecified(); |
| bool isExplicit = D.getDeclSpec().isExplicitSpecified(); |
| |
| // Check that the return type is not an abstract class type. |
| // For record types, this is done by the AbstractClassUsageDiagnoser once |
| // the class has been completely parsed. |
| if (!DC->isRecord() && |
| RequireNonAbstractType(D.getIdentifierLoc(), |
| R->getAsFunctionType()->getResultType(), |
| diag::err_abstract_type_in_decl, |
| AbstractReturnType)) |
| D.setInvalidType(); |
| |
| // Do not allow returning a objc interface by-value. |
| if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { |
| Diag(D.getIdentifierLoc(), |
| diag::err_object_cannot_be_passed_returned_by_value) << 0 |
| << R->getAsFunctionType()->getResultType(); |
| D.setInvalidType(); |
| } |
| |
| bool isVirtualOkay = false; |
| FunctionDecl *NewFD; |
| if (D.getKind() == Declarator::DK_Constructor) { |
| // This is a C++ constructor declaration. |
| assert(DC->isRecord() && |
| "Constructors can only be declared in a member context"); |
| |
| R = CheckConstructorDeclarator(D, R, SC); |
| |
| // Create the new declaration |
| NewFD = CXXConstructorDecl::Create(Context, |
| cast<CXXRecordDecl>(DC), |
| D.getIdentifierLoc(), Name, R, |
| isExplicit, isInline, |
| /*isImplicitlyDeclared=*/false); |
| } else if (D.getKind() == Declarator::DK_Destructor) { |
| // This is a C++ destructor declaration. |
| if (DC->isRecord()) { |
| R = CheckDestructorDeclarator(D, SC); |
| |
| NewFD = CXXDestructorDecl::Create(Context, |
| cast<CXXRecordDecl>(DC), |
| D.getIdentifierLoc(), Name, R, |
| isInline, |
| /*isImplicitlyDeclared=*/false); |
| |
| isVirtualOkay = true; |
| } else { |
| Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); |
| |
| // Create a FunctionDecl to satisfy the function definition parsing |
| // code path. |
| NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), |
| Name, R, SC, isInline, |
| /*hasPrototype=*/true, |
| // FIXME: Move to DeclGroup... |
| D.getDeclSpec().getSourceRange().getBegin()); |
| D.setInvalidType(); |
| } |
| } else if (D.getKind() == Declarator::DK_Conversion) { |
| if (!DC->isRecord()) { |
| Diag(D.getIdentifierLoc(), |
| diag::err_conv_function_not_member); |
| return 0; |
| } |
| |
| CheckConversionDeclarator(D, R, SC); |
| NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), |
| D.getIdentifierLoc(), Name, R, |
| isInline, isExplicit); |
| |
| isVirtualOkay = true; |
| } else if (DC->isRecord()) { |
| // If the of the function is the same as the name of the record, then this |
| // must be an invalid constructor that has a return type. |
| // (The parser checks for a return type and makes the declarator a |
| // constructor if it has no return type). |
| // must have an invalid constructor that has a return type |
| if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ |
| Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) |
| << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) |
| << SourceRange(D.getIdentifierLoc()); |
| return 0; |
| } |
| |
| // This is a C++ method declaration. |
| NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), |
| D.getIdentifierLoc(), Name, R, |
| (SC == FunctionDecl::Static), isInline); |
| |
| isVirtualOkay = (SC != FunctionDecl::Static); |
| } else { |
| // Determine whether the function was written with a |
| // prototype. This true when: |
| // - we're in C++ (where every function has a prototype), |
| // - there is a prototype in the declarator, or |
| // - the type R of the function is some kind of typedef or other reference |
| // to a type name (which eventually refers to a function type). |
| bool HasPrototype = |
| getLangOptions().CPlusPlus || |
| (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || |
| (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); |
| |
| NewFD = FunctionDecl::Create(Context, DC, |
| D.getIdentifierLoc(), |
| Name, R, SC, isInline, HasPrototype, |
| // FIXME: Move to DeclGroup... |
| D.getDeclSpec().getSourceRange().getBegin()); |
| } |
| |
| if (D.isInvalidType()) |
| NewFD->setInvalidDecl(); |
| |
| // Set the lexical context. If the declarator has a C++ |
| // scope specifier, the lexical context will be different |
| // from the semantic context. |
| NewFD->setLexicalDeclContext(CurContext); |
| |
| // C++ [dcl.fct.spec]p5: |
| // The virtual specifier shall only be used in declarations of |
| // nonstatic class member functions that appear within a |
| // member-specification of a class declaration; see 10.3. |
| // |
| if (isVirtual && !NewFD->isInvalidDecl()) { |
| if (!isVirtualOkay) { |
| Diag(D.getDeclSpec().getVirtualSpecLoc(), |
| diag::err_virtual_non_function); |
| } else if (!CurContext->isRecord()) { |
| // 'virtual' was specified outside of the class. |
| Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) |
| << CodeModificationHint::CreateRemoval( |
| SourceRange(D.getDeclSpec().getVirtualSpecLoc())); |
| } else { |
| // Okay: Add virtual to the method. |
| cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); |
| CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); |
| CurClass->setAggregate(false); |
| CurClass->setPOD(false); |
| CurClass->setPolymorphic(true); |
| CurClass->setHasTrivialConstructor(false); |
| } |
| } |
| |
| if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { |
| // Look for virtual methods in base classes that this method might override. |
| |
| BasePaths Paths; |
| // FIXME: This will not include hidden member functions. |
| if (LookupInBases(cast<CXXRecordDecl>(DC), |
| MemberLookupCriteria(Name, LookupMemberName, |
| // FIXME: Shouldn't IDNS_Member be |
| // enough here? |
| Decl::IDNS_Member | |
| Decl::IDNS_Ordinary), Paths)) { |
| for (BasePaths::decl_iterator I = Paths.found_decls_begin(), |
| E = Paths.found_decls_end(); I != E; ++I) { |
| if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { |
| OverloadedFunctionDecl::function_iterator MatchedDecl; |
| // FIXME: Is this OK? Should it be done by LookupInBases? |
| if (IsOverload(NewMD, OldMD, MatchedDecl)) |
| continue; |
| if (!OldMD->isVirtual()) |
| continue; |
| |
| if (!CheckOverridingFunctionReturnType(NewMD, OldMD)) |
| NewMD->addOverriddenMethod(OldMD); |
| } |
| } |
| } |
| } |
| |
| if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && |
| !CurContext->isRecord()) { |
| // C++ [class.static]p1: |
| // A data or function member of a class may be declared static |
| // in a class definition, in which case it is a static member of |
| // the class. |
| |
| // Complain about the 'static' specifier if it's on an out-of-line |
| // member function definition. |
| Diag(D.getDeclSpec().getStorageClassSpecLoc(), |
| diag::err_static_out_of_line) |
| << CodeModificationHint::CreateRemoval( |
| SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); |
| } |
| |
| // Handle GNU asm-label extension (encoded as an attribute). |
| if (Expr *E = (Expr*) D.getAsmLabel()) { |
| // The parser guarantees this is a string. |
| StringLiteral *SE = cast<StringLiteral>(E); |
| NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), |
| SE->getByteLength()))); |
| } |
| |
| // Copy the parameter declarations from the declarator D to the function |
| // declaration NewFD, if they are available. First scavenge them into Params. |
| llvm::SmallVector<ParmVarDecl*, 16> Params; |
| if (D.getNumTypeObjects() > 0) { |
| DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; |
| |
| // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs |
| // function that takes no arguments, not a function that takes a |
| // single void argument. |
| // We let through "const void" here because Sema::GetTypeForDeclarator |
| // already checks for that case. |
| if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && |
| FTI.ArgInfo[0].Param && |
| FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { |
| // Empty arg list, don't push any params. |
| ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); |
| |
| // In C++, the empty parameter-type-list must be spelled "void"; a |
| // typedef of void is not permitted. |
| if (getLangOptions().CPlusPlus && |
| Param->getType().getUnqualifiedType() != Context.VoidTy) |
| Diag(Param->getLocation(), diag::err_param_typedef_of_void); |
| // FIXME: Leaks decl? |
| } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { |
| for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) |
| Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); |
| } |
| |
| } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { |
| // When we're declaring a function with a typedef, typeof, etc as in the |
| // following example, we'll need to synthesize (unnamed) |
| // parameters for use in the declaration. |
| // |
| // @code |
| // typedef void fn(int); |
| // fn f; |
| // @endcode |
| |
| // Synthesize a parameter for each argument type. |
| for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), |
| AE = FT->arg_type_end(); AI != AE; ++AI) { |
| ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, |
| SourceLocation(), 0, |
| *AI, VarDecl::None, 0); |
| Param->setImplicit(); |
| Params.push_back(Param); |
| } |
| } else { |
| assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && |
| "Should not need args for typedef of non-prototype fn"); |
| } |
| // Finally, we know we have the right number of parameters, install them. |
| NewFD->setParams(Context, Params.data(), Params.size()); |
| |
| |
| |
| // If name lookup finds a previous declaration that is not in the |
| // same scope as the new declaration, this may still be an |
| // acceptable redeclaration. |
| if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && |
| !(NewFD->hasLinkage() && |
| isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) |
| PrevDecl = 0; |
| |
| // Perform semantic checking on the function declaration. |
| bool OverloadableAttrRequired = false; // FIXME: HACK! |
| CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, |
| /*FIXME:*/OverloadableAttrRequired); |
| |
| if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { |
| // An out-of-line member function declaration must also be a |
| // definition (C++ [dcl.meaning]p1). |
| if (!IsFunctionDefinition) { |
| Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) |
| << D.getCXXScopeSpec().getRange(); |
| NewFD->setInvalidDecl(); |
| } else if (!Redeclaration) { |
| // The user tried to provide an out-of-line definition for a |
| // function that is a member of a class or namespace, but there |
| // was no such member function declared (C++ [class.mfct]p2, |
| // C++ [namespace.memdef]p2). For example: |
| // |
| // class X { |
| // void f() const; |
| // }; |
| // |
| // void X::f() { } // ill-formed |
| // |
| // Complain about this problem, and attempt to suggest close |
| // matches (e.g., those that differ only in cv-qualifiers and |
| // whether the parameter types are references). |
| Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) |
| << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); |
| NewFD->setInvalidDecl(); |
| |
| LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, |
| true); |
| assert(!Prev.isAmbiguous() && |
| "Cannot have an ambiguity in previous-declaration lookup"); |
| for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); |
| Func != FuncEnd; ++Func) { |
| if (isa<FunctionDecl>(*Func) && |
| isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) |
| Diag((*Func)->getLocation(), diag::note_member_def_close_match); |
| } |
| |
| PrevDecl = 0; |
| } |
| } |
| |
| // Handle attributes. We need to have merged decls when handling attributes |
| // (for example to check for conflicts, etc). |
| // FIXME: This needs to happen before we merge declarations. Then, |
| // let attribute merging cope with attribute conflicts. |
| ProcessDeclAttributes(NewFD, D); |
| AddKnownFunctionAttributes(NewFD); |
| |
| if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { |
| // If a function name is overloadable in C, then every function |
| // with that name must be marked "overloadable". |
| Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) |
| << Redeclaration << NewFD; |
| if (PrevDecl) |
| Diag(PrevDecl->getLocation(), |
| diag::note_attribute_overloadable_prev_overload); |
| NewFD->addAttr(::new (Context) OverloadableAttr()); |
| } |
| |
| // If this is a locally-scoped extern C function, update the |
| // map of such names. |
| if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) |
| && !NewFD->isInvalidDecl()) |
| RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); |
| |
| return NewFD; |
| } |
| |
| /// \brief Perform semantic checking of a new function declaration. |
| /// |
| /// Performs semantic analysis of the new function declaration |
| /// NewFD. This routine performs all semantic checking that does not |
| /// require the actual declarator involved in the declaration, and is |
| /// used both for the declaration of functions as they are parsed |
| /// (called via ActOnDeclarator) and for the declaration of functions |
| /// that have been instantiated via C++ template instantiation (called |
| /// via InstantiateDecl). |
| /// |
| /// This sets NewFD->isInvalidDecl() to true if there was an error. |
| void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, |
| bool &Redeclaration, |
| bool &OverloadableAttrRequired) { |
| // If NewFD is already known erroneous, don't do any of this checking. |
| if (NewFD->isInvalidDecl()) |
| return; |
| |
| if (NewFD->getResultType()->isVariablyModifiedType()) { |
| // Functions returning a variably modified type violate C99 6.7.5.2p2 |
| // because all functions have linkage. |
| Diag(NewFD->getLocation(), diag::err_vm_func_decl); |
| return NewFD->setInvalidDecl(); |
| } |
| |
| // Semantic checking for this function declaration (in isolation). |
| if (getLangOptions().CPlusPlus) { |
| // C++-specific checks. |
| if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { |
| CheckConstructor(Constructor); |
| } else if (isa<CXXDestructorDecl>(NewFD)) { |
| CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); |
| Record->setUserDeclaredDestructor(true); |
| // C++ [class]p4: A POD-struct is an aggregate class that has [...] no |
| // user-defined destructor. |
| Record->setPOD(false); |
| |
| // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- |
| // declared destructor. |
| Record->setHasTrivialDestructor(false); |
| } else if (CXXConversionDecl *Conversion |
| = dyn_cast<CXXConversionDecl>(NewFD)) |
| ActOnConversionDeclarator(Conversion); |
| |
| // Extra checking for C++ overloaded operators (C++ [over.oper]). |
| if (NewFD->isOverloadedOperator() && |
| CheckOverloadedOperatorDeclaration(NewFD)) |
| return NewFD->setInvalidDecl(); |
| } |
| |
| // C99 6.7.4p6: |
| // [... ] For a function with external linkage, the following |
| // restrictions apply: [...] If all of the file scope declarations |
| // for a function in a translation unit include the inline |
| // function specifier without extern, then the definition in that |
| // translation unit is an inline definition. An inline definition |
| // does not provide an external definition for the function, and |
| // does not forbid an external definition in another translation |
| // unit. |
| // |
| // Here we determine whether this function, in isolation, would be a |
| // C99 inline definition. MergeCompatibleFunctionDecls looks at |
| // previous declarations. |
| if (NewFD->isInline() && getLangOptions().C99 && |
| NewFD->getStorageClass() == FunctionDecl::None && |
| NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) |
| NewFD->setC99InlineDefinition(true); |
| |
| // Check for a previous declaration of this name. |
| if (!PrevDecl && NewFD->isExternC(Context)) { |
| // Since we did not find anything by this name and we're declaring |
| // an extern "C" function, look for a non-visible extern "C" |
| // declaration with the same name. |
| llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos |
| = LocallyScopedExternalDecls.find(NewFD->getDeclName()); |
| if (Pos != LocallyScopedExternalDecls.end()) |
| PrevDecl = Pos->second; |
| } |
| |
| // Merge or overload the declaration with an existing declaration of |
| // the same name, if appropriate. |
| if (PrevDecl) { |
| // Determine whether NewFD is an overload of PrevDecl or |
| // a declaration that requires merging. If it's an overload, |
| // there's no more work to do here; we'll just add the new |
| // function to the scope. |
| OverloadedFunctionDecl::function_iterator MatchedDecl; |
| |
| if (!getLangOptions().CPlusPlus && |
| AllowOverloadingOfFunction(PrevDecl, Context)) { |
| OverloadableAttrRequired = true; |
| |
| // Functions marked "overloadable" must have a prototype (that |
| // we can't get through declaration merging). |
| if (!NewFD->getType()->getAsFunctionProtoType()) { |
| Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) |
| << NewFD; |
| Redeclaration = true; |
| |
| // Turn this into a variadic function with no parameters. |
| QualType R = Context.getFunctionType( |
| NewFD->getType()->getAsFunctionType()->getResultType(), |
| 0, 0, true, 0); |
| NewFD->setType(R); |
| return NewFD->setInvalidDecl(); |
| } |
| } |
| |
| if (PrevDecl && |
| (!AllowOverloadingOfFunction(PrevDecl, Context) || |
| !IsOverload(NewFD, PrevDecl, MatchedDecl))) { |
| Redeclaration = true; |
| Decl *OldDecl = PrevDecl; |
| |
| // If PrevDecl was an overloaded function, extract the |
| // FunctionDecl that matched. |
| if (isa<OverloadedFunctionDecl>(PrevDecl)) |
| OldDecl = *MatchedDecl; |
| |
| // NewFD and OldDecl represent declarations that need to be |
| // merged. |
| if (MergeFunctionDecl(NewFD, OldDecl)) |
| return NewFD->setInvalidDecl(); |
| |
| NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); |
| } |
| } |
| |
| // In C++, check default arguments now that we have merged decls. Unless |
| // the lexical context is the class, because in this case this is done |
| // during delayed parsing anyway. |
| if (getLangOptions().CPlusPlus && !CurContext->isRecord()) |
| CheckCXXDefaultArguments(NewFD); |
| } |
| |
| bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { |
| // FIXME: Need strict checking. In C89, we need to check for |
| // any assignment, increment, decrement, function-calls, or |
| // commas outside of a sizeof. In C99, it's the same list, |
| // except that the aforementioned are allowed in unevaluated |
| // expressions. Everything else falls under the |
| // "may accept other forms of constant expressions" exception. |
| // (We never end up here for C++, so the constant expression |
| // rules there don't matter.) |
| if (Init->isConstantInitializer(Context)) |
| return false; |
| Diag(Init->getExprLoc(), diag::err_init_element_not_constant) |
| << Init->getSourceRange(); |
| return true; |
| } |
| |
| void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { |
| AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); |
| } |
| |
| /// AddInitializerToDecl - Adds the initializer Init to the |
| /// declaration dcl. If DirectInit is true, this is C++ direct |
| /// initialization rather than copy initialization. |
| void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { |
| Decl *RealDecl = dcl.getAs<Decl>(); |
| // If there is no declaration, there was an error parsing it. Just ignore |
| // the initializer. |
| if (RealDecl == 0) |
| return; |
| |
| if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { |
| // With declarators parsed the way they are, the parser cannot |
| // distinguish between a normal initializer and a pure-specifier. |
| // Thus this grotesque test. |
| IntegerLiteral *IL; |
| Expr *Init = static_cast<Expr *>(init.get()); |
| if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && |
| Context.getCanonicalType(IL->getType()) == Context.IntTy) { |
| if (Method->isVirtualAsWritten()) { |
| Method->setPure(); |
| |
| // A class is abstract if at least one function is pure virtual. |
| cast<CXXRecordDecl>(CurContext)->setAbstract(true); |
| } else if (!Method->isInvalidDecl()) { |
| Diag(Method->getLocation(), diag::err_non_virtual_pure) |
| << Method->getDeclName() << Init->getSourceRange(); |
| Method->setInvalidDecl(); |
| } |
| } else { |
| Diag(Method->getLocation(), diag::err_member_function_initialization) |
| << Method->getDeclName() << Init->getSourceRange(); |
| Method->setInvalidDecl(); |
| } |
| return; |
| } |
| |
| VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); |
| if (!VDecl) { |
| if (getLangOptions().CPlusPlus && |
| RealDecl->getLexicalDeclContext()->isRecord() && |
| isa<NamedDecl>(RealDecl)) |
| Diag(RealDecl->getLocation(), diag::err_member_initialization) |
| << cast<NamedDecl>(RealDecl)->getDeclName(); |
| else |
| Diag(RealDecl->getLocation(), diag::err_illegal_initializer); |
| RealDecl->setInvalidDecl(); |
| return; |
| } |
| |
| if (!VDecl->getType()->isArrayType() && |
| RequireCompleteType(VDecl->getLocation(), VDecl->getType(), |
| diag::err_typecheck_decl_incomplete_type)) { |
| RealDecl->setInvalidDecl(); |
| return; |
| } |
| |
| const VarDecl *Def = 0; |
| if (VDecl->getDefinition(Def)) { |
| Diag(VDecl->getLocation(), diag::err_redefinition) |
| << VDecl->getDeclName(); |
| Diag(Def->getLocation(), diag::note_previous_definition); |
| VDecl->setInvalidDecl(); |
| return; |
| } |
| |
| // Take ownership of the expression, now that we're sure we have somewhere |
| // to put it. |
| Expr *Init = init.takeAs<Expr>(); |
| assert(Init && "missing initializer"); |
| |
| // Get the decls type and save a reference for later, since |
| // CheckInitializerTypes may change it. |
| QualType DclT = VDecl->getType(), SavT = DclT; |
| if (VDecl->isBlockVarDecl()) { |
| if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 |
| Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); |
| VDecl->setInvalidDecl(); |
| } else if (!VDecl->isInvalidDecl()) { |
| if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), |
| VDecl->getDeclName(), DirectInit, VDecl)) |
| VDecl->setInvalidDecl(); |
| |
| // C++ 3.6.2p2, allow dynamic initialization of static initializers. |
| // Don't check invalid declarations to avoid emitting useless diagnostics. |
| if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { |
| if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. |
| CheckForConstantInitializer(Init, DclT); |
| } |
| } |
| } else if (VDecl->isStaticDataMember() && |
| VDecl->getLexicalDeclContext()->isRecord()) { |
| // This is an in-class initialization for a static data member, e.g., |
| // |
| // struct S { |
| // static const int value = 17; |
| // }; |
| |
| // Attach the initializer |
| VDecl->setInit(Context, Init); |
| |
| // C++ [class.mem]p4: |
| // A member-declarator can contain a constant-initializer only |
| // if it declares a static member (9.4) of const integral or |
| // const enumeration type, see 9.4.2. |
| QualType T = VDecl->getType(); |
| if (!T->isDependentType() && |
| (!Context.getCanonicalType(T).isConstQualified() || |
| !T->isIntegralType())) { |
| Diag(VDecl->getLocation(), diag::err_member_initialization) |
| << VDecl->getDeclName() << Init->getSourceRange(); |
| VDecl->setInvalidDecl(); |
| } else { |
| // C++ [class.static.data]p4: |
| // If a static data member is of const integral or const |
| // enumeration type, its declaration in the class definition |
| // can specify a constant-initializer which shall be an |
| // integral constant expression (5.19). |
| if (!Init->isTypeDependent() && |
| !Init->getType()->isIntegralType()) { |
| // We have a non-dependent, non-integral or enumeration type. |
| Diag(Init->getSourceRange().getBegin(), |
| diag::err_in_class_initializer_non_integral_type) |
| << Init->getType() << Init->getSourceRange(); |
| VDecl->setInvalidDecl(); |
| } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { |
| // Check whether the expression is a constant expression. |
| llvm::APSInt Value; |
| SourceLocation Loc; |
| if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { |
| Diag(Loc, diag::err_in_class_initializer_non_constant) |
| << Init->getSourceRange(); |
| VDecl->setInvalidDecl(); |
| } else if (!VDecl->getType()->isDependentType()) |
| ImpCastExprToType(Init, VDecl->getType()); |
| } |
| } |
| } else if (VDecl->isFileVarDecl()) { |
| if (VDecl->getStorageClass() == VarDecl::Extern) |
| Diag(VDecl->getLocation(), diag::warn_extern_init); |
| if (!VDecl->isInvalidDecl()) |
| if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), |
| VDecl->getDeclName(), DirectInit)) |
| VDecl->setInvalidDecl(); |
| |
| // C++ 3.6.2p2, allow dynamic initialization of static initializers. |
| // Don't check invalid declarations to avoid emitting useless diagnostics. |
| if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { |
| // C99 6.7.8p4. All file scoped initializers need to be constant. |
| CheckForConstantInitializer(Init, DclT); |
| } |
| } |
| // If the type changed, it means we had an incomplete type that was |
| // completed by the initializer. For example: |
| // int ary[] = { 1, 3, 5 }; |
| // "ary" transitions from a VariableArrayType to a ConstantArrayType. |
| if (!VDecl->isInvalidDecl() && (DclT != SavT)) { |
| VDecl->setType(DclT); |
| Init->setType(DclT); |
| } |
| |
| // Attach the initializer to the decl. |
| VDecl->setInit(Context, Init); |
| |
| // If the previous declaration of VDecl was a tentative definition, |
| // remove it from the set of tentative definitions. |
| if (VDecl->getPreviousDeclaration() && |
| VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { |
| llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos |
| = TentativeDefinitions.find(VDecl->getDeclName()); |
| assert(Pos != TentativeDefinitions.end() && |
| "Unrecorded tentative definition?"); |
| TentativeDefinitions.erase(Pos); |
| } |
| |
| return; |
| } |
| |
| void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { |
| Decl *RealDecl = dcl.getAs<Decl>(); |
| |
| // If there is no declaration, there was an error parsing it. Just ignore it. |
| if (RealDecl == 0) |
| return; |
| |
| if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { |
| QualType Type = Var->getType(); |
| |
| // Record tentative definitions. |
| if (Var->isTentativeDefinition(Context)) |
| TentativeDefinitions[Var->getDeclName()] = Var; |
| |
| // C++ [dcl.init.ref]p3: |
| // The initializer can be omitted for a reference only in a |
| // parameter declaration (8.3.5), in the declaration of a |
| // function return type, in the declaration of a class member |
| // within its class declaration (9.2), and where the extern |
| // specifier is explicitly used. |
| if (Type->isReferenceType() && !Var->hasExternalStorage()) { |
| Diag(Var->getLocation(), diag::err_reference_var_requires_init) |
| << Var->getDeclName() |
| << SourceRange(Var->getLocation(), Var->getLocation()); |
| Var->setInvalidDecl(); |
| return; |
| } |
| |
| // C++ [dcl.init]p9: |
| // |
| // If no initializer is specified for an object, and the object |
| // is of (possibly cv-qualified) non-POD class type (or array |
| // thereof), the object shall be default-initialized; if the |
| // object is of const-qualified type, the underlying class type |
| // shall have a user-declared default constructor. |
| if (getLangOptions().CPlusPlus) { |
| QualType InitType = Type; |
| if (const ArrayType *Array = Context.getAsArrayType(Type)) |
| InitType = Array->getElementType(); |
| if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && |
| InitType->isRecordType()) { |
| CXXRecordDecl *RD = |
| cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); |
| CXXConstructorDecl *Constructor = 0; |
| if (!RequireCompleteType(Var->getLocation(), InitType, |
| diag::err_invalid_incomplete_type_use)) |
| Constructor |
| = PerformInitializationByConstructor(InitType, 0, 0, |
| Var->getLocation(), |
| SourceRange(Var->getLocation(), |
| Var->getLocation()), |
| Var->getDeclName(), |
| IK_Default); |
| if (!Constructor) |
| Var->setInvalidDecl(); |
| else if (!RD->hasTrivialConstructor()) |
| InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); |
| } |
| } |
| |
| #if 0 |
| // FIXME: Temporarily disabled because we are not properly parsing |
| // linkage specifications on declarations, e.g., |
| // |
| // extern "C" const CGPoint CGPointerZero; |
| // |
| // C++ [dcl.init]p9: |
| // |
| // If no initializer is specified for an object, and the |
| // object is of (possibly cv-qualified) non-POD class type (or |
| // array thereof), the object shall be default-initialized; if |
| // the object is of const-qualified type, the underlying class |
| // type shall have a user-declared default |
| // constructor. Otherwise, if no initializer is specified for |
| // an object, the object and its subobjects, if any, have an |
| // indeterminate initial value; if the object or any of its |
| // subobjects are of const-qualified type, the program is |
| // ill-formed. |
| // |
| // This isn't technically an error in C, so we don't diagnose it. |
| // |
| // FIXME: Actually perform the POD/user-defined default |
| // constructor check. |
| if (getLangOptions().CPlusPlus && |
| Context.getCanonicalType(Type).isConstQualified() && |
| !Var->hasExternalStorage()) |
| Diag(Var->getLocation(), diag::err_const_var_requires_init) |
| << Var->getName() |
| << SourceRange(Var->getLocation(), Var->getLocation()); |
| #endif |
| } |
| } |
| |
| Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, DeclPtrTy *Group, |
| unsigned NumDecls) { |
| llvm::SmallVector<Decl*, 8> Decls; |
| |
| for (unsigned i = 0; i != NumDecls; ++i) |
| if (Decl *D = Group[i].getAs<Decl>()) |
| Decls.push_back(D); |
| |
| // Perform semantic analysis that depends on having fully processed both |
| // the declarator and initializer. |
| for (unsigned i = 0, e = Decls.size(); i != e; ++i) { |
| VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); |
| if (!IDecl) |
| continue; |
| QualType T = IDecl->getType(); |
| |
| // Block scope. C99 6.7p7: If an identifier for an object is declared with |
| // no linkage (C99 6.2.2p6), the type for the object shall be complete... |
| if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { |
| if (!IDecl->isInvalidDecl() && |
| RequireCompleteType(IDecl->getLocation(), T, |
| diag::err_typecheck_decl_incomplete_type)) |
| IDecl->setInvalidDecl(); |
| } |
| // File scope. C99 6.9.2p2: A declaration of an identifier for and |
| // object that has file scope without an initializer, and without a |
| // storage-class specifier or with the storage-class specifier "static", |
| // constitutes a tentative definition. Note: A tentative definition with |
| // external linkage is valid (C99 6.2.2p5). |
| if (IDecl->isTentativeDefinition(Context)) { |
| QualType CheckType = T; |
| unsigned DiagID = diag::err_typecheck_decl_incomplete_type; |
| |
| const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); |
| if (ArrayT) { |
| CheckType = ArrayT->getElementType(); |
| DiagID = diag::err_illegal_decl_array_incomplete_type; |
| } |
| |
| if (IDecl->isInvalidDecl()) { |
| // Do nothing with invalid declarations |
| } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && |
| RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { |
| // C99 6.9.2p3: If the declaration of an identifier for an object is |
| // a tentative definition and has internal linkage (C99 6.2.2p3), the |
| // declared type shall not be an incomplete type. |
| IDecl->setInvalidDecl(); |
| } |
| } |
| } |
| return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, |
| Decls.data(), Decls.size())); |
| } |
| |
| |
| /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() |
| /// to introduce parameters into function prototype scope. |
| Sema::DeclPtrTy |
| Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { |
| const DeclSpec &DS = D.getDeclSpec(); |
| |
| // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. |
| VarDecl::StorageClass StorageClass = VarDecl::None; |
| if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { |
| StorageClass = VarDecl::Register; |
| } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { |
| Diag(DS.getStorageClassSpecLoc(), |
| diag::err_invalid_storage_class_in_func_decl); |
| D.getMutableDeclSpec().ClearStorageClassSpecs(); |
| } |
| |
| if (D.getDeclSpec().isThreadSpecified()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); |
| |
| DiagnoseFunctionSpecifiers(D); |
| |
| // Check that there are no default arguments inside the type of this |
| // parameter (C++ only). |
| if (getLangOptions().CPlusPlus) |
| CheckExtraCXXDefaultArguments(D); |
| |
| TagDecl *OwnedDecl = 0; |
| QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); |
| |
| if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { |
| // C++ [dcl.fct]p6: |
| // Types shall not be defined in return or parameter types. |
| Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) |
| << Context.getTypeDeclType(OwnedDecl); |
| } |
| |
| // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. |
| // Can this happen for params? We already checked that they don't conflict |
| // among each other. Here they can only shadow globals, which is ok. |
| IdentifierInfo *II = D.getIdentifier(); |
| if (II) { |
| if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { |
| if (PrevDecl->isTemplateParameter()) { |
| // Maybe we will complain about the shadowed template parameter. |
| DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); |
| // Just pretend that we didn't see the previous declaration. |
| PrevDecl = 0; |
| } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { |
| Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; |
| |
| // Recover by removing the name |
| II = 0; |
| D.SetIdentifier(0, D.getIdentifierLoc()); |
| } |
| } |
| } |
| |
| // Parameters can not be abstract class types. |
| // For record types, this is done by the AbstractClassUsageDiagnoser once |
| // the class has been completely parsed. |
| if (!CurContext->isRecord() && |
| RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, |
| diag::err_abstract_type_in_decl, |
| AbstractParamType)) |
| D.setInvalidType(true); |
| |
| QualType T = adjustParameterType(parmDeclType); |
| |
| ParmVarDecl *New; |
| if (T == parmDeclType) // parameter type did not need adjustment |
| New = ParmVarDecl::Create(Context, CurContext, |
| D.getIdentifierLoc(), II, |
| parmDeclType, StorageClass, |
| 0); |
| else // keep track of both the adjusted and unadjusted types |
| New = OriginalParmVarDecl::Create(Context, CurContext, |
| D.getIdentifierLoc(), II, T, |
| parmDeclType, StorageClass, 0); |
| |
| if (D.isInvalidType()) |
| New->setInvalidDecl(); |
| |
| // Parameter declarators cannot be interface types. All ObjC objects are |
| // passed by reference. |
| if (T->isObjCInterfaceType()) { |
| Diag(D.getIdentifierLoc(), |
| diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; |
| New->setInvalidDecl(); |
| } |
| |
| // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). |
| if (D.getCXXScopeSpec().isSet()) { |
| Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) |
| << D.getCXXScopeSpec().getRange(); |
| New->setInvalidDecl(); |
| } |
| |
| // Add the parameter declaration into this scope. |
| S->AddDecl(DeclPtrTy::make(New)); |
| if (II) |
| IdResolver.AddDecl(New); |
| |
| ProcessDeclAttributes(New, D); |
| |
| if (New->hasAttr<BlocksAttr>()) { |
| Diag(New->getLocation(), diag::err_block_on_nonlocal); |
| } |
| return DeclPtrTy::make(New); |
| } |
| |
| void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, |
| SourceLocation LocAfterDecls) { |
| assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && |
| "Not a function declarator!"); |
| DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; |
| |
| // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' |
| // for a K&R function. |
| if (!FTI.hasPrototype) { |
| for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { |
| --i; |
| if (FTI.ArgInfo[i].Param == 0) { |
| std::string Code = " int "; |
| Code += FTI.ArgInfo[i].Ident->getName(); |
| Code += ";\n"; |
| Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) |
| << FTI.ArgInfo[i].Ident |
| << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); |
| |
| // Implicitly declare the argument as type 'int' for lack of a better |
| // type. |
| DeclSpec DS; |
| const char* PrevSpec; // unused |
| DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, |
| PrevSpec); |
| Declarator ParamD(DS, Declarator::KNRTypeListContext); |
| ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); |
| FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); |
| } |
| } |
| } |
| } |
| |
| Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, |
| Declarator &D) { |
| assert(getCurFunctionDecl() == 0 && "Function parsing confused"); |
| assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && |
| "Not a function declarator!"); |
| DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; |
| |
| if (FTI.hasPrototype) { |
| // FIXME: Diagnose arguments without names in C. |
| } |
| |
| Scope *ParentScope = FnBodyScope->getParent(); |
| |
| DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); |
| return ActOnStartOfFunctionDef(FnBodyScope, DP); |
| } |
| |
| Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { |
| FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); |
| |
| CurFunctionNeedsScopeChecking = false; |
| |
| // See if this is a redefinition. |
| const FunctionDecl *Definition; |
| if (FD->getBody(Context, Definition)) { |
| Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); |
| Diag(Definition->getLocation(), diag::note_previous_definition); |
| } |
| |
| // Builtin functions cannot be defined. |
| if (unsigned BuiltinID = FD->getBuiltinID(Context)) { |
| if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { |
| Diag(FD->getLocation(), diag::err_builtin_definition) << FD; |
| FD->setInvalidDecl(); |
| } |
| } |
| |
| // The return type of a function definition must be complete |
| // (C99 6.9.1p3, C++ [dcl.fct]p6). |
| QualType ResultType = FD->getResultType(); |
| if (!ResultType->isDependentType() && !ResultType->isVoidType() && |
| !FD->isInvalidDecl() && |
| RequireCompleteType(FD->getLocation(), ResultType, |
| diag::err_func_def_incomplete_result)) |
| FD->setInvalidDecl(); |
| |
| // GNU warning -Wmissing-prototypes: |
| // Warn if a global function is defined without a previous |
| // prototype declaration. This warning is issued even if the |
| // definition itself provides a prototype. The aim is to detect |
| // global functions that fail to be declared in header files. |
| if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && |
| !FD->isMain()) { |
| bool MissingPrototype = true; |
| for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); |
| Prev; Prev = Prev->getPreviousDeclaration()) { |
| // Ignore any declarations that occur in function or method |
| // scope, because they aren't visible from the header. |
| if (Prev->getDeclContext()->isFunctionOrMethod()) |
| continue; |
| |
| MissingPrototype = !Prev->getType()->isFunctionProtoType(); |
| break; |
| } |
| |
| if (MissingPrototype) |
| Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; |
| } |
| |
| if (FnBodyScope) |
| PushDeclContext(FnBodyScope, FD); |
| |
| // Check the validity of our function parameters |
| CheckParmsForFunctionDef(FD); |
| |
| // Introduce our parameters into the function scope |
| for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { |
| ParmVarDecl *Param = FD->getParamDecl(p); |
| Param->setOwningFunction(FD); |
| |
| // If this has an identifier, add it to the scope stack. |
| if (Param->getIdentifier() && FnBodyScope) |
| PushOnScopeChains(Param, FnBodyScope); |
| } |
| |
| // Checking attributes of current function definition |
| // dllimport attribute. |
| if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { |
| // dllimport attribute cannot be applied to definition. |
| if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { |
| Diag(FD->getLocation(), |
| diag::err_attribute_can_be_applied_only_to_symbol_declaration) |
| << "dllimport"; |
| FD->setInvalidDecl(); |
| return DeclPtrTy::make(FD); |
| } else { |
| // If a symbol previously declared dllimport is later defined, the |
| // attribute is ignored in subsequent references, and a warning is |
| // emitted. |
| Diag(FD->getLocation(), |
| diag::warn_redeclaration_without_attribute_prev_attribute_ignored) |
| << FD->getNameAsCString() << "dllimport"; |
| } |
| } |
| return DeclPtrTy::make(FD); |
| } |
| |
| Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { |
| return ActOnFinishFunctionBody(D, move(BodyArg), false); |
| } |
| |
| Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, |
| bool IsInstantiation) { |
| Decl *dcl = D.getAs<Decl>(); |
| Stmt *Body = BodyArg.takeAs<Stmt>(); |
| if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { |
| FD->setBody(Body); |
| assert(FD == getCurFunctionDecl() && "Function parsing confused"); |
| } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { |
| assert(MD == getCurMethodDecl() && "Method parsing confused"); |
| MD->setBody(Body); |
| } else { |
| Body->Destroy(Context); |
| return DeclPtrTy(); |
| } |
| if (!IsInstantiation) |
| PopDeclContext(); |
| |
| // Verify and clean out per-function state. |
| |
| assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); |
| |
| // Check goto/label use. |
| for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator |
| I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { |
| LabelStmt *L = I->second; |
| |
| // Verify that we have no forward references left. If so, there was a goto |
| // or address of a label taken, but no definition of it. Label fwd |
| // definitions are indicated with a null substmt. |
| if (L->getSubStmt() != 0) |
| continue; |
| |
| // Emit error. |
| Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); |
| |
| // At this point, we have gotos that use the bogus label. Stitch it into |
| // the function body so that they aren't leaked and that the AST is well |
| // formed. |
| if (Body == 0) { |
| // The whole function wasn't parsed correctly, just delete this. |
| L->Destroy(Context); |
| continue; |
| } |
| |
| // Otherwise, the body is valid: we want to stitch the label decl into the |
| // function somewhere so that it is properly owned and so that the goto |
| // has a valid target. Do this by creating a new compound stmt with the |
| // label in it. |
| |
| // Give the label a sub-statement. |
| L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); |
| |
| CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? |
| cast<CXXTryStmt>(Body)->getTryBlock() : |
| cast<CompoundStmt>(Body); |
| std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); |
| Elements.push_back(L); |
| Compound->setStmts(Context, &Elements[0], Elements.size()); |
| } |
| FunctionLabelMap.clear(); |
| |
| if (!Body) return D; |
| |
| // Verify that that gotos and switch cases don't jump into scopes illegally. |
| if (CurFunctionNeedsScopeChecking) |
| DiagnoseInvalidJumps(Body); |
| |
| // C++ constructors that have function-try-blocks can't have return statements |
| // in the handlers of that block. (C++ [except.handle]p14) Verify this. |
| if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) |
| DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); |
| |
| return D; |
| } |
| |
| /// ImplicitlyDefineFunction - An undeclared identifier was used in a function |
| /// call, forming a call to an implicitly defined function (per C99 6.5.1p2). |
| NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, |
| IdentifierInfo &II, Scope *S) { |
| // Before we produce a declaration for an implicitly defined |
| // function, see whether there was a locally-scoped declaration of |
| // this name as a function or variable. If so, use that |
| // (non-visible) declaration, and complain about it. |
| llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos |
| = LocallyScopedExternalDecls.find(&II); |
| if (Pos != LocallyScopedExternalDecls.end()) { |
| Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; |
| Diag(Pos->second->getLocation(), diag::note_previous_declaration); |
| return Pos->second; |
| } |
| |
| // Extension in C99. Legal in C90, but warn about it. |
| if (getLangOptions().C99) |
| Diag(Loc, diag::ext_implicit_function_decl) << &II; |
| else |
| Diag(Loc, diag::warn_implicit_function_decl) << &II; |
| |
| // FIXME: handle stuff like: |
| // void foo() { extern float X(); } |
| // void bar() { X(); } <-- implicit decl for X in another scope. |
| |
| // Set a Declarator for the implicit definition: int foo(); |
| const char *Dummy; |
| DeclSpec DS; |
| bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); |
| Error = Error; // Silence warning. |
| assert(!Error && "Error setting up implicit decl!"); |
| Declarator D(DS, Declarator::BlockContext); |
| D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, |
| 0, 0, false, false, 0, 0, Loc, D), |
| SourceLocation()); |
| D.SetIdentifier(&II, Loc); |
| |
| // Insert this function into translation-unit scope. |
| |
| DeclContext *PrevDC = CurContext; |
| CurContext = Context.getTranslationUnitDecl(); |
| |
| FunctionDecl *FD = |
| dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); |
| FD->setImplicit(); |
| |
| CurContext = PrevDC; |
| |
| AddKnownFunctionAttributes(FD); |
| |
| return FD; |
| } |
| |
| /// \brief Adds any function attributes that we know a priori based on |
| /// the declaration of this function. |
| /// |
| /// These attributes can apply both to implicitly-declared builtins |
| /// (like __builtin___printf_chk) or to library-declared functions |
| /// like NSLog or printf. |
| void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { |
| if (FD->isInvalidDecl()) |
| return; |
| |
| // If this is a built-in function, map its builtin attributes to |
| // actual attributes. |
| if (unsigned BuiltinID = FD->getBuiltinID(Context)) { |
| // Handle printf-formatting attributes. |
| unsigned FormatIdx; |
| bool HasVAListArg; |
| if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { |
| if (!FD->getAttr<FormatAttr>()) |
| FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, |
| FormatIdx + 2)); |
| } |
| |
| // Mark const if we don't care about errno and that is the only |
| // thing preventing the function from being const. This allows |
| // IRgen to use LLVM intrinsics for such functions. |
| if (!getLangOptions().MathErrno && |
| Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { |
| if (!FD->getAttr<ConstAttr>()) |
| FD->addAttr(::new (Context) ConstAttr()); |
| } |
| } |
| |
| IdentifierInfo *Name = FD->getIdentifier(); |
| if (!Name) |
| return; |
| if ((!getLangOptions().CPlusPlus && |
| FD->getDeclContext()->isTranslationUnit()) || |
| (isa<LinkageSpecDecl>(FD->getDeclContext()) && |
| cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == |
| LinkageSpecDecl::lang_c)) { |
| // Okay: this could be a libc/libm/Objective-C function we know |
| // about. |
| } else |
| return; |
| |
| if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { |
| if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { |
| // FIXME: We known better than our headers. |
| const_cast<FormatAttr *>(Format)->setType("printf"); |
| } else |
| FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); |
| } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { |
| if (!FD->getAttr<FormatAttr>()) |
| FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); |
| } |
| } |
| |
| TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { |
| assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); |
| assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); |
| |
| // Scope manipulation handled by caller. |
| TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, |
| D.getIdentifierLoc(), |
| D.getIdentifier(), |
| T); |
| |
| if (TagType *TT = dyn_cast<TagType>(T)) { |
| TagDecl *TD = TT->getDecl(); |
| |
| // If the TagDecl that the TypedefDecl points to is an anonymous decl |
| // keep track of the TypedefDecl. |
| if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) |
| TD->setTypedefForAnonDecl(NewTD); |
| } |
| |
| if (D.isInvalidType()) |
| NewTD->setInvalidDecl(); |
| return NewTD; |
| } |
| |
| |
| /// \brief Determine whether a tag with a given kind is acceptable |
| /// as a redeclaration of the given tag declaration. |
| /// |
| /// \returns true if the new tag kind is acceptable, false otherwise. |
| bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, |
| TagDecl::TagKind NewTag, |
| SourceLocation NewTagLoc, |
| const IdentifierInfo &Name) { |
| // C++ [dcl.type.elab]p3: |
| // The class-key or enum keyword present in the |
| // elaborated-type-specifier shall agree in kind with the |
| // declaration to which the name in theelaborated-type-specifier |
| // refers. This rule also applies to the form of |
| // elaborated-type-specifier that declares a class-name or |
| // friend class since it can be construed as referring to the |
| // definition of the class. Thus, in any |
| // elaborated-type-specifier, the enum keyword shall be used to |
| // refer to an enumeration (7.2), the union class-keyshall be |
| // used to refer to a union (clause 9), and either the class or |
| // struct class-key shall be used to refer to a class (clause 9) |
| // declared using the class or struct class-key. |
| TagDecl::TagKind OldTag = Previous->getTagKind(); |
| if (OldTag == NewTag) |
| return true; |
| |
| if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && |
| (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { |
| // Warn about the struct/class tag mismatch. |
| bool isTemplate = false; |
| if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) |
| isTemplate = Record->getDescribedClassTemplate(); |
| |
| Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) |
| << (NewTag == TagDecl::TK_class) |
| << isTemplate << &Name |
| << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), |
| OldTag == TagDecl::TK_class? "class" : "struct"); |
| Diag(Previous->getLocation(), diag::note_previous_use); |
| return true; |
| } |
| return false; |
| } |
| |
| /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the |
| /// former case, Name will be non-null. In the later case, Name will be null. |
| /// TagSpec indicates what kind of tag this is. TK indicates whether this is a |
| /// reference/declaration/definition of a tag. |
| Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, |
| SourceLocation KWLoc, const CXXScopeSpec &SS, |
| IdentifierInfo *Name, SourceLocation NameLoc, |
| AttributeList *Attr, AccessSpecifier AS, |
| bool &OwnedDecl) { |
| // If this is not a definition, it must have a name. |
| assert((Name != 0 || TK == TK_Definition) && |
| "Nameless record must be a definition!"); |
| |
| OwnedDecl = false; |
| TagDecl::TagKind Kind; |
| switch (TagSpec) { |
| default: assert(0 && "Unknown tag type!"); |
| case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; |
| case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; |
| case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; |
| case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; |
| } |
| |
| DeclContext *SearchDC = CurContext; |
| DeclContext *DC = CurContext; |
| NamedDecl *PrevDecl = 0; |
| |
| bool Invalid = false; |
| |
| if (Name && SS.isNotEmpty()) { |
| // We have a nested-name tag ('struct foo::bar'). |
| |
| // Check for invalid 'foo::'. |
| if (SS.isInvalid()) { |
| Name = 0; |
| goto CreateNewDecl; |
| } |
| |
| if (RequireCompleteDeclContext(SS)) |
| return DeclPtrTy::make((Decl *)0); |
| |
| DC = computeDeclContext(SS); |
| SearchDC = DC; |
| // Look-up name inside 'foo::'. |
| PrevDecl |
| = dyn_cast_or_null<TagDecl>( |
| LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); |
| |
| // A tag 'foo::bar' must already exist. |
| if (PrevDecl == 0) { |
| Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); |
| Name = 0; |
| Invalid = true; |
| goto CreateNewDecl; |
| } |
| } else if (Name) { |
| // If this is a named struct, check to see if there was a previous forward |
| // declaration or definition. |
| // FIXME: We're looking into outer scopes here, even when we |
| // shouldn't be. Doing so can result in ambiguities that we |
| // shouldn't be diagnosing. |
| LookupResult R = LookupName(S, Name, LookupTagName, |
| /*RedeclarationOnly=*/(TK != TK_Reference)); |
| if (R.isAmbiguous()) { |
| DiagnoseAmbiguousLookup(R, Name, NameLoc); |
| // FIXME: This is not best way to recover from case like: |
| // |
| // struct S s; |
| // |
| // causes needless "incomplete type" error later. |
| Name = 0; |
| PrevDecl = 0; |
| Invalid = true; |
| } |
| else |
| PrevDecl = R; |
| |
| if (!getLangOptions().CPlusPlus && TK != TK_Reference) { |
| // FIXME: This makes sure that we ignore the contexts associated |
| // with C structs, unions, and enums when looking for a matching |
| // tag declaration or definition. See the similar lookup tweak |
| // in Sema::LookupName; is there a better way to deal with this? |
| while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) |
| SearchDC = SearchDC->getParent(); |
| } |
| } |
| |
| if (PrevDecl && PrevDecl->isTemplateParameter()) { |
| // Maybe we will complain about the shadowed template parameter. |
| DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); |
| // Just pretend that we didn't see the previous declaration. |
| PrevDecl = 0; |
| } |
| |
| if (PrevDecl) { |
| // Check whether the previous declaration is usable. |
| (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); |
| |
| if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { |
| // If this is a use of a previous tag, or if the tag is already declared |
| // in the same scope (so that the definition/declaration completes or |
| // rementions the tag), reuse the decl. |
| if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { |
| // Make sure that this wasn't declared as an enum and now used as a |
| // struct or something similar. |
| if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { |
| bool SafeToContinue |
| = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && |
| Kind != TagDecl::TK_enum); |
| if (SafeToContinue) |
| Diag(KWLoc, diag::err_use_with_wrong_tag) |
| << Name |
| << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), |
| PrevTagDecl->getKindName()); |
| else |
| Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; |
| Diag(PrevDecl->getLocation(), diag::note_previous_use); |
| |
| if (SafeToContinue) |
| Kind = PrevTagDecl->getTagKind(); |
| else { |
| // Recover by making this an anonymous redefinition. |
| Name = 0; |
| PrevDecl = 0; |
| Invalid = true; |
| } |
| } |
| |
| if (!Invalid) { |
| // If this is a use, just return the declaration we found. |
| |
| // FIXME: In the future, return a variant or some other clue |
| // for the consumer of this Decl to know it doesn't own it. |
| // For our current ASTs this shouldn't be a problem, but will |
| // need to be changed with DeclGroups. |
| if (TK == TK_Reference) |
| return DeclPtrTy::make(PrevDecl); |
| |
| // Diagnose attempts to redefine a tag. |
| if (TK == TK_Definition) { |
| if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { |
| Diag(NameLoc, diag::err_redefinition) << Name; |
| Diag(Def->getLocation(), diag::note_previous_definition); |
| // If this is a redefinition, recover by making this |
| // struct be anonymous, which will make any later |
| // references get the previous definition. |
| Name = 0; |
| PrevDecl = 0; |
| Invalid = true; |
| } else { |
| // If the type is currently being defined, complain |
| // about a nested redefinition. |
| TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); |
| if (Tag->isBeingDefined()) { |
| Diag(NameLoc, diag::err_nested_redefinition) << Name; |
| Diag(PrevTagDecl->getLocation(), |
| diag::note_previous_definition); |
| Name = 0; |
| PrevDecl = 0; |
| Invalid = true; |
| } |
| } |
| |
| // Okay, this is definition of a previously declared or referenced |
| // tag PrevDecl. We're going to create a new Decl for it. |
| } |
| } |
| // If we get here we have (another) forward declaration or we |
| // have a definition. Just create a new decl. |
| } else { |
| // If we get here, this is a definition of a new tag type in a nested |
| // scope, e.g. "struct foo; void bar() { struct foo; }", just create a |
| // new decl/type. We set PrevDecl to NULL so that the entities |
| // have distinct types. |
| PrevDecl = 0; |
| } |
| // If we get here, we're going to create a new Decl. If PrevDecl |
| // is non-NULL, it's a definition of the tag declared by |
| // PrevDecl. If it's NULL, we have a new definition. |
| } else { |
| // PrevDecl is a namespace, template, or anything else |
| // that lives in the IDNS_Tag identifier namespace. |
| if (isDeclInScope(PrevDecl, SearchDC, S)) { |
| // The tag name clashes with a namespace name, issue an error and |
| // recover by making this tag be anonymous. |
| Diag(NameLoc, diag::err_redefinition_different_kind) << Name; |
| Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
| Name = 0; |
| PrevDecl = 0; |
| Invalid = true; |
| } else { |
| // The existing declaration isn't relevant to us; we're in a |
| // new scope, so clear out the previous declaration. |
| PrevDecl = 0; |
| } |
| } |
| } else if (TK == TK_Reference && SS.isEmpty() && Name && |
| (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { |
| // C++ [basic.scope.pdecl]p5: |
| // -- for an elaborated-type-specifier of the form |
| // |
| // class-key identifier |
| // |
| // if the elaborated-type-specifier is used in the |
| // decl-specifier-seq or parameter-declaration-clause of a |
| // function defined in namespace scope, the identifier is |
| // declared as a class-name in the namespace that contains |
| // the declaration; otherwise, except as a friend |
| // declaration, the identifier is declared in the smallest |
| // non-class, non-function-prototype scope that contains the |
| // declaration. |
| // |
| // C99 6.7.2.3p8 has a similar (but not identical!) provision for |
| // C structs and unions. |
| // |
| // GNU C also supports this behavior as part of its incomplete |
| // enum types extension, while GNU C++ does not. |
| // |
| // Find the context where we'll be declaring the tag. |
| // FIXME: We would like to maintain the current DeclContext as the |
| // lexical context, |
| while (SearchDC->isRecord()) |
| SearchDC = SearchDC->getParent(); |
| |
| // Find the scope where we'll be declaring the tag. |
| while (S->isClassScope() || |
| (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || |
| ((S->getFlags() & Scope::DeclScope) == 0) || |
| (S->getEntity() && |
| ((DeclContext *)S->getEntity())->isTransparentContext())) |
| S = S->getParent(); |
| } |
| |
| CreateNewDecl: |
| |
| // If there is an identifier, use the location of the identifier as the |
| // location of the decl, otherwise use the location of the struct/union |
| // keyword. |
| SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; |
| |
| // Otherwise, create a new declaration. If there is a previous |
| // declaration of the same entity, the two will be linked via |
| // PrevDecl. |
| TagDecl *New; |
| |
| if (Kind == TagDecl::TK_enum) { |
| // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: |
| // enum X { A, B, C } D; D should chain to X. |
| New = EnumDecl::Create(Context, SearchDC, Loc, Name, |
| cast_or_null<EnumDecl>(PrevDecl)); |
| // If this is an undefined enum, warn. |
| if (TK != TK_Definition && !Invalid) { |
| unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum |
| : diag::ext_forward_ref_enum; |
| Diag(Loc, DK); |
| } |
| } else { |
| // struct/union/class |
| |
| // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: |
| // struct X { int A; } D; D should chain to X. |
| if (getLangOptions().CPlusPlus) |
| // FIXME: Look for a way to use RecordDecl for simple structs. |
| New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, |
| cast_or_null<CXXRecordDecl>(PrevDecl)); |
| else |
| New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, |
| cast_or_null<RecordDecl>(PrevDecl)); |
| } |
| |
| if (Kind != TagDecl::TK_enum) { |
| // Handle #pragma pack: if the #pragma pack stack has non-default |
| // alignment, make up a packed attribute for this decl. These |
| // attributes are checked when the ASTContext lays out the |
| // structure. |
| // |
| // It is important for implementing the correct semantics that this |
| // happen here (in act on tag decl). The #pragma pack stack is |
| // maintained as a result of parser callbacks which can occur at |
| // many points during the parsing of a struct declaration (because |
| // the #pragma tokens are effectively skipped over during the |
| // parsing of the struct). |
| if (unsigned Alignment = getPragmaPackAlignment()) |
| New->addAttr(::new (Context) PackedAttr(Alignment * 8)); |
| } |
| |
| if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { |
| // C++ [dcl.typedef]p3: |
| // [...] Similarly, in a given scope, a class or enumeration |
| // shall not be declared with the same name as a typedef-name |
| // that is declared in that scope and refers to a type other |
| // than the class or enumeration itself. |
| LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); |
| TypedefDecl *PrevTypedef = 0; |
| if (Lookup.getKind() == LookupResult::Found) |
| PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); |
| |
| if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && |
| Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != |
| Context.getCanonicalType(Context.getTypeDeclType(New))) { |
| Diag(Loc, diag::err_tag_definition_of_typedef) |
| << Context.getTypeDeclType(New) |
| << PrevTypedef->getUnderlyingType(); |
| Diag(PrevTypedef->getLocation(), diag::note_previous_definition); |
| Invalid = true; |
| } |
| } |
| |
| if (Invalid) |
| New->setInvalidDecl(); |
| |
| if (Attr) |
| ProcessDeclAttributeList(New, Attr); |
| |
| // If we're declaring or defining a tag in function prototype scope |
| // in C, note that this type can only be used within the function. |
| if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) |
| Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); |
| |
| // Set the lexical context. If the tag has a C++ scope specifier, the |
| // lexical context will be different from the semantic context. |
| New->setLexicalDeclContext(CurContext); |
| |
| // Set the access specifier. |
| if (!Invalid) |
| SetMemberAccessSpecifier(New, PrevDecl, AS); |
| |
| if (TK == TK_Definition) |
| New->startDefinition(); |
| |
| // If this has an identifier, add it to the scope stack. |
| if (Name) { |
| S = getNonFieldDeclScope(S); |
| PushOnScopeChains(New, S); |
| } else { |
| CurContext->addDecl(Context, New); |
| } |
| |
| OwnedDecl = true; |
| return DeclPtrTy::make(New); |
| } |
| |
| void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { |
| AdjustDeclIfTemplate(TagD); |
| TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); |
| |
| // Enter the tag context. |
| PushDeclContext(S, Tag); |
| |
| if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { |
| FieldCollector->StartClass(); |
| |
| if (Record->getIdentifier()) { |
| // C++ [class]p2: |
| // [...] The class-name is also inserted into the scope of the |
| // class itself; this is known as the injected-class-name. For |
| // purposes of access checking, the injected-class-name is treated |
| // as if it were a public member name. |
| CXXRecordDecl *InjectedClassName |
| = CXXRecordDecl::Create(Context, Record->getTagKind(), |
| CurContext, Record->getLocation(), |
| Record->getIdentifier(), Record); |
| InjectedClassName->setImplicit(); |
| InjectedClassName->setAccess(AS_public); |
| if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) |
| InjectedClassName->setDescribedClassTemplate(Template); |
| PushOnScopeChains(InjectedClassName, S); |
| assert(InjectedClassName->isInjectedClassName() && |
| "Broken injected-class-name"); |
| } |
| } |
| } |
| |
| void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { |
| AdjustDeclIfTemplate(TagD); |
| TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); |
| |
| if (isa<CXXRecordDecl>(Tag)) |
| FieldCollector->FinishClass(); |
| |
| // Exit this scope of this tag's definition. |
| PopDeclContext(); |
| |
| // Notify the consumer that we've defined a tag. |
| Consumer.HandleTagDeclDefinition(Tag); |
| } |
| |
| // Note that FieldName may be null for anonymous bitfields. |
| bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, |
| QualType FieldTy, const Expr *BitWidth) { |
| |
| // C99 6.7.2.1p4 - verify the field type. |
| // C++ 9.6p3: A bit-field shall have integral or enumeration type. |
| if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { |
| // Handle incomplete types with specific error. |
| if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) |
| return true; |
| if (FieldName) |
| return Diag(FieldLoc, diag::err_not_integral_type_bitfield) |
| << FieldName << FieldTy << BitWidth->getSourceRange(); |
| return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) |
| << FieldTy << BitWidth->getSourceRange(); |
| } |
| |
| // If the bit-width is type- or value-dependent, don't try to check |
| // it now. |
| if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) |
| return false; |
| |
| llvm::APSInt Value; |
| if (VerifyIntegerConstantExpression(BitWidth, &Value)) |
| return true; |
| |
| // Zero-width bitfield is ok for anonymous field. |
| if (Value == 0 && FieldName) |
| return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; |
| |
| if (Value.isSigned() && Value.isNegative()) { |
| if (FieldName) |
| return Diag(FieldLoc, diag::err_bitfield_has_negative_width) |
| << FieldName << Value.toString(10); |
| return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) |
| << Value.toString(10); |
| } |
| |
| if (!FieldTy->isDependentType()) { |
| uint64_t TypeSize = Context.getTypeSize(FieldTy); |
| if (Value.getZExtValue() > TypeSize) { |
| if (FieldName) |
| return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) |
| << FieldName << (unsigned)TypeSize; |
| return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) |
| << (unsigned)TypeSize; |
| } |
| } |
| |
| return false; |
| } |
| |
| /// ActOnField - Each field of a struct/union/class is passed into this in order |
| /// to create a FieldDecl object for it. |
| Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, |
| SourceLocation DeclStart, |
| Declarator &D, ExprTy *BitfieldWidth) { |
| FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), |
| DeclStart, D, static_cast<Expr*>(BitfieldWidth), |
| AS_public); |
| return DeclPtrTy::make(Res); |
| } |
| |
| /// HandleField - Analyze a field of a C struct or a C++ data member. |
| /// |
| FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, |
| SourceLocation DeclStart, |
| Declarator &D, Expr *BitWidth, |
| AccessSpecifier AS) { |
| IdentifierInfo *II = D.getIdentifier(); |
| SourceLocation Loc = DeclStart; |
| if (II) Loc = D.getIdentifierLoc(); |
| |
| QualType T = GetTypeForDeclarator(D, S); |
| if (getLangOptions().CPlusPlus) |
| CheckExtraCXXDefaultArguments(D); |
| |
| DiagnoseFunctionSpecifiers(D); |
| |
| if (D.getDeclSpec().isThreadSpecified()) |
| Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); |
| |
| NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); |
| if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) |
| PrevDecl = 0; |
| |
| FieldDecl *NewFD |
| = CheckFieldDecl(II, T, Record, Loc, |
| D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, |
| BitWidth, AS, PrevDecl, &D); |
| if (NewFD->isInvalidDecl() && PrevDecl) { |
| // Don't introduce NewFD into scope; there's already something |
| // with the same name in the same scope. |
| } else if (II) { |
| PushOnScopeChains(NewFD, S); |
| } else |
| Record->addDecl(Context, NewFD); |
| |
| return NewFD; |
| } |
| |
| /// \brief Build a new FieldDecl and check its well-formedness. |
| /// |
| /// This routine builds a new FieldDecl given the fields name, type, |
| /// record, etc. \p PrevDecl should refer to any previous declaration |
| /// with the same name and in the same scope as the field to be |
| /// created. |
| /// |
| /// \returns a new FieldDecl. |
| /// |
| /// \todo The Declarator argument is a hack. It will be removed once |
| FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, |
| RecordDecl *Record, SourceLocation Loc, |
| bool Mutable, Expr *BitWidth, |
| AccessSpecifier AS, NamedDecl *PrevDecl, |
| Declarator *D) { |
| IdentifierInfo *II = Name.getAsIdentifierInfo(); |
| bool InvalidDecl = false; |
| if (D) InvalidDecl = D->isInvalidType(); |
| |
| // If we receive a broken type, recover by assuming 'int' and |
| // marking this declaration as invalid. |
| if (T.isNull()) { |
| InvalidDecl = true; |
| T = Context.IntTy; |
| } |
| |
| // C99 6.7.2.1p8: A member of a structure or union may have any type other |
| // than a variably modified type. |
| if (T->isVariablyModifiedType()) { |
| bool SizeIsNegative; |
| QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, |
| SizeIsNegative); |
| if (!FixedTy.isNull()) { |
| Diag(Loc, diag::warn_illegal_constant_array_size); |
| T = FixedTy; |
| } else { |
| if (SizeIsNegative) |
| Diag(Loc, diag::err_typecheck_negative_array_size); |
| else |
| Diag(Loc, diag::err_typecheck_field_variable_size); |
| T = Context.IntTy; |
| InvalidDecl = true; |
| } |
| } |
| |
| // Fields can not have abstract class types |
| if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, |
| AbstractFieldType)) |
| InvalidDecl = true; |
| |
| // If this is declared as a bit-field, check the bit-field. |
| if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { |
| InvalidDecl = true; |
| DeleteExpr(BitWidth); |
| BitWidth = 0; |
| } |
| |
| FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, |
| Mutable); |
| if (InvalidDecl) |
| NewFD->setInvalidDecl(); |
| |
| if (PrevDecl && !isa<TagDecl>(PrevDecl)) { |
| Diag(Loc, diag::err_duplicate_member) << II; |
| Diag(PrevDecl->getLocation(), diag::note_previous_declaration); |
| NewFD->setInvalidDecl(); |
| } |
| |
| if (getLangOptions().CPlusPlus && !T->isPODType()) |
| cast<CXXRecordDecl>(Record)->setPOD(false); |
| |
| // FIXME: We need to pass in the attributes given an AST |
| // representation, not a parser representation. |
| if (D) |
| ProcessDeclAttributes(NewFD, *D); |
| |
| if (T.isObjCGCWeak()) |
| Diag(Loc, diag::warn_attribute_weak_on_field); |
| |
| NewFD->setAccess(AS); |
| |
| // C++ [dcl.init.aggr]p1: |
| // An aggregate is an array or a class (clause 9) with [...] no |
| // private or protected non-static data members (clause 11). |
| // A POD must be an aggregate. |
| if (getLangOptions().CPlusPlus && |
| (AS == AS_private || AS == AS_protected)) { |
| CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); |
| CXXRecord->setAggregate(false); |
| CXXRecord->setPOD(false); |
| } |
| |
| return NewFD; |
| } |
| |
| /// TranslateIvarVisibility - Translate visibility from a token ID to an |
| /// AST enum value. |
| static ObjCIvarDecl::AccessControl |
| TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { |
| switch (ivarVisibility) { |
| default: assert(0 && "Unknown visitibility kind"); |
| case tok::objc_private: return ObjCIvarDecl::Private; |
| case tok::objc_public: return ObjCIvarDecl::Public; |
| case tok::objc_protected: return ObjCIvarDecl::Protected; |
| case tok::objc_package: return ObjCIvarDecl::Package; |
| } |
| } |
| |
| /// ActOnIvar - Each ivar field of an objective-c class is passed into this |
| /// in order to create an IvarDecl object for it. |
| Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, |
| SourceLocation DeclStart, |
| Declarator &D, ExprTy *BitfieldWidth, |
| tok::ObjCKeywordKind Visibility) { |
| |
| IdentifierInfo *II = D.getIdentifier(); |
| Expr *BitWidth = (Expr*)BitfieldWidth; |
| SourceLocation Loc = DeclStart; |
| if (II) Loc = D.getIdentifierLoc(); |
| |
| // FIXME: Unnamed fields can be handled in various different ways, for |
| // example, unnamed unions inject all members into the struct namespace! |
| |
| QualType T = GetTypeForDeclarator(D, S); |
| |
| if (BitWidth) { |
| // 6.7.2.1p3, 6.7.2.1p4 |
| if (VerifyBitField(Loc, II, T, BitWidth)) { |
| D.setInvalidType(); |
| DeleteExpr(BitWidth); |
| BitWidth = 0; |
| } |
| } else { |
| // Not a bitfield. |
| |
| // validate II. |
| |
| } |
| |
| // C99 6.7.2.1p8: A member of a structure or union may have any type other |
| // than a variably modified type. |
| if (T->isVariablyModifiedType()) { |
| Diag(Loc, diag::err_typecheck_ivar_variable_size); |
| D.setInvalidType(); |
| } |
| |
| // Get the visibility (access control) for this ivar. |
| ObjCIvarDecl::AccessControl ac = |
| Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) |
| : ObjCIvarDecl::None; |
| |
| // Construct the decl. |
| ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, |
| (Expr *)BitfieldWidth); |
| |
| if (II) { |
| NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); |
| if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) |
| && !isa<TagDecl>(PrevDecl)) { |
| Diag(Loc, diag::err_duplicate_member) << II; |
| Diag(PrevDecl->getLocation(), diag::note_previous_declaration); |
| NewID->setInvalidDecl(); |
| } |
| } |
| |
| // Process attributes attached to the ivar. |
| ProcessDeclAttributes(NewID, D); |
| |
| if (D.isInvalidType()) |
| NewID->setInvalidDecl(); |
| |
| if (II) { |
| // FIXME: When interfaces are DeclContexts, we'll need to add |
| // these to the interface. |
| S->AddDecl(DeclPtrTy::make(NewID)); |
| IdResolver.AddDecl(NewID); |
| } |
| |
| return DeclPtrTy::make(NewID); |
| } |
| |
| void Sema::ActOnFields(Scope* S, |
| SourceLocation RecLoc, DeclPtrTy RecDecl, |
| DeclPtrTy *Fields, unsigned NumFields, |
| SourceLocation LBrac, SourceLocation RBrac, |
| AttributeList *Attr) { |
| Decl *EnclosingDecl = RecDecl.getAs<Decl>(); |
| assert(EnclosingDecl && "missing record or interface decl"); |
| |
| // If the decl this is being inserted into is invalid, then it may be a |
| // redeclaration or some other bogus case. Don't try to add fields to it. |
| if (EnclosingDecl->isInvalidDecl()) { |
| // FIXME: Deallocate fields? |
| return; |
| } |
| |
| |
| // Verify that all the fields are okay. |
| unsigned NumNamedMembers = 0; |
| llvm::SmallVector<FieldDecl*, 32> RecFields; |
| |
| RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); |
| for (unsigned i = 0; i != NumFields; ++i) { |
| FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); |
| |
| // Get the type for the field. |
| Type *FDTy = FD->getType().getTypePtr(); |
| |
| if (!FD->isAnonymousStructOrUnion()) { |
| // Remember all fields written by the user. |
| RecFields.push_back(FD); |
| } |
| |
| // If the field is already invalid for some reason, don't emit more |
| // diagnostics about it. |
| if (FD->isInvalidDecl()) |
| continue; |
| |
| // C99 6.7.2.1p2: |
| // A structure or union shall not contain a member with |
| // incomplete or function type (hence, a structure shall not |
| // contain an instance of itself, but may contain a pointer to |
| // an instance of itself), except that the last member of a |
| // structure with more than one named member may have incomplete |
| // array type; such a structure (and any union containing, |
| // possibly recursively, a member that is such a structure) |
| // shall not be a member of a structure or an element of an |
| // array. |
| if (FDTy->isFunctionType()) { |
| // Field declared as a function. |
| Diag(FD->getLocation(), diag::err_field_declared_as_function) |
| << FD->getDeclName(); |
| FD->setInvalidDecl(); |
| EnclosingDecl->setInvalidDecl(); |
| continue; |
| } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && |
| Record && Record->isStruct()) { |
| // Flexible array member. |
| if (NumNamedMembers < 1) { |
| Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) |
| << FD->getDeclName(); |
| FD->setInvalidDecl(); |
| EnclosingDecl->setInvalidDecl(); |
| continue; |
| } |
| // Okay, we have a legal flexible array member at the end of the struct. |
| if (Record) |
| Record->setHasFlexibleArrayMember(true); |
| } else if (!FDTy->isDependentType() && |
| RequireCompleteType(FD->getLocation(), FD->getType(), |
| diag::err_field_incomplete)) { |
| // Incomplete type |
| FD->setInvalidDecl(); |
| EnclosingDecl->setInvalidDecl(); |
| continue; |
| } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { |
| if (FDTTy->getDecl()->hasFlexibleArrayMember()) { |
| // If this is a member of a union, then entire union becomes "flexible". |
| if (Record && Record->isUnion()) { |
| Record->setHasFlexibleArrayMember(true); |
| } else { |
| // If this is a struct/class and this is not the last element, reject |
| // it. Note that GCC supports variable sized arrays in the middle of |
| // structures. |
| if (i != NumFields-1) |
| Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) |
| << FD->getDeclName() << FD->getType(); |
| else { |
| // We support flexible arrays at the end of structs in |
| // other structs as an extension. |
| Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) |
| << FD->getDeclName(); |
| if (Record) |
| Record->setHasFlexibleArrayMember(true); |
| } |
| } |
| } |
| } else if (FDTy->isObjCInterfaceType()) { |
| /// A field cannot be an Objective-c object |
| Diag(FD->getLocation(), diag::err_statically_allocated_object); |
| FD->setInvalidDecl(); |
| EnclosingDecl->setInvalidDecl(); |
| continue; |
| } |
| // Keep track of the number of named members. |
| if (FD->getIdentifier()) |
| ++NumNamedMembers; |
| } |
| |
| // Okay, we successfully defined 'Record'. |
| if (Record) { |
| Record->completeDefinition(Context); |
| } else { |
| ObjCIvarDecl **ClsFields = |
| reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); |
| if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { |
| ID->setIVarList(ClsFields, RecFields.size(), Context); |
| ID->setLocEnd(RBrac); |
| |
| // Must enforce the rule that ivars in the base classes may not be |
| // duplicates. |
| if (ID->getSuperClass()) { |
| for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), |
| IVE = ID->ivar_end(); IVI != IVE; ++IVI) { |
| ObjCIvarDecl* Ivar = (*IVI); |
| |
| if (IdentifierInfo *II = Ivar->getIdentifier()) { |
| ObjCIvarDecl* prevIvar = |
| ID->getSuperClass()->lookupInstanceVariable(Context, II); |
| if (prevIvar) { |
| Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; |
| Diag(prevIvar->getLocation(), diag::note_previous_declaration); |
| } |
| } |
| } |
| } |
| } else if (ObjCImplementationDecl *IMPDecl = |
| dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { |
| assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); |
| for (unsigned I = 0, N = RecFields.size(); I != N; ++I) { |
| // FIXME: Set the DeclContext correctly when we build the |
| // declarations. |
| ClsFields[I]->setLexicalDeclContext(IMPDecl); |
| IMPDecl->addDecl(Context, ClsFields[I]); |
| } |
| CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); |
| } |
| } |
| |
| if (Attr) |
| ProcessDeclAttributeList(Record, Attr); |
| } |
| |
| EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, |
| EnumConstantDecl *LastEnumConst, |
| SourceLocation IdLoc, |
| IdentifierInfo *Id, |
| ExprArg val) { |
| Expr *Val = (Expr *)val.get(); |
| |
| llvm::APSInt EnumVal(32); |
| QualType EltTy; |
| if (Val && !Val->isTypeDependent()) { |
| // Make sure to promote the operand type to int. |
| UsualUnaryConversions(Val); |
| if (Val != val.get()) { |
| val.release(); |
| val = Val; |
| } |
| |
| // C99 6.7.2.2p2: Make sure we have an integer constant expression. |
| SourceLocation ExpLoc; |
| if (!Val->isValueDependent() && |
| VerifyIntegerConstantExpression(Val, &EnumVal)) { |
| Val = 0; |
| } else { |
| EltTy = Val->getType(); |
| } |
| } |
| |
| if (!Val) { |
| if (LastEnumConst) { |
| // Assign the last value + 1. |
| EnumVal = LastEnumConst->getInitVal(); |
| ++EnumVal; |
| |
| // Check for overflow on increment. |
| if (EnumVal < LastEnumConst->getInitVal()) |
| Diag(IdLoc, diag::warn_enum_value_overflow); |
| |
| EltTy = LastEnumConst->getType(); |
| } else { |
| // First value, set to zero. |
| EltTy = Context.IntTy; |
| EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); |
| } |
| } |
| |
| val.release(); |
| return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, |
| Val, EnumVal); |
| } |
| |
| |
| Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, |
| DeclPtrTy lastEnumConst, |
| SourceLocation IdLoc, |
| IdentifierInfo *Id, |
| SourceLocation EqualLoc, ExprTy *val) { |
| EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); |
| EnumConstantDecl *LastEnumConst = |
| cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); |
| Expr *Val = static_cast<Expr*>(val); |
| |
| // The scope passed in may not be a decl scope. Zip up the scope tree until |
| // we find one that is. |
| S = getNonFieldDeclScope(S); |
| |
| // Verify that there isn't already something declared with this name in this |
| // scope. |
| NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); |
| if (PrevDecl && PrevDecl->isTemplateParameter()) { |
| // Maybe we will complain about the shadowed template parameter. |
| DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); |
| // Just pretend that we didn't see the previous declaration. |
| PrevDecl = 0; |
| } |
| |
| if (PrevDecl) { |
| // When in C++, we may get a TagDecl with the same name; in this case the |
| // enum constant will 'hide' the tag. |
| assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && |
| "Received TagDecl when not in C++!"); |
| if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { |
| if (isa<EnumConstantDecl>(PrevDecl)) |
| Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; |
| else |
| Diag(IdLoc, diag::err_redefinition) << Id; |
| Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
| if (Val) Val->Destroy(Context); |
| return DeclPtrTy(); |
| } |
| } |
| |
| EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, |
| IdLoc, Id, Owned(Val)); |
| |
| // Register this decl in the current scope stack. |
| if (New) |
| PushOnScopeChains(New, S); |
| |
| return DeclPtrTy::make(New); |
| } |
| |
| void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, |
| SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, |
| DeclPtrTy *Elements, unsigned NumElements) { |
| EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); |
| QualType EnumType = Context.getTypeDeclType(Enum); |
| |
| // TODO: If the result value doesn't fit in an int, it must be a long or long |
| // long value. ISO C does not support this, but GCC does as an extension, |
| // emit a warning. |
| unsigned IntWidth = Context.Target.getIntWidth(); |
| |
| // Verify that all the values are okay, compute the size of the values, and |
| // reverse the list. |
| unsigned NumNegativeBits = 0; |
| unsigned NumPositiveBits = 0; |
| |
| // Keep track of whether all elements have type int. |
| bool AllElementsInt = true; |
| |
| for (unsigned i = 0; i != NumElements; ++i) { |
| EnumConstantDecl *ECD = |
| cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); |
| if (!ECD) continue; // Already issued a diagnostic. |
| |
| // If the enum value doesn't fit in an int, emit an extension warning. |
| const llvm::APSInt &InitVal = ECD->getInitVal(); |
| assert(InitVal.getBitWidth() >= IntWidth && |
| "Should have promoted value to int"); |
| if (InitVal.getBitWidth() > IntWidth) { |
| llvm::APSInt V(InitVal); |
| V.trunc(IntWidth); |
| V.extend(InitVal.getBitWidth()); |
| if (V != InitVal) |
| Diag(ECD->getLocation(), diag::ext_enum_value_not_int) |
| << InitVal.toString(10); |
| } |
| |
| // Keep track of the size of positive and negative values. |
| if (InitVal.isUnsigned() || InitVal.isNonNegative()) |
| NumPositiveBits = std::max(NumPositiveBits, |
| (unsigned)InitVal.getActiveBits()); |
| else |
| NumNegativeBits = std::max(NumNegativeBits, |
| (unsigned)InitVal.getMinSignedBits()); |
| |
| // Keep track of whether every enum element has type int (very commmon). |
| if (AllElementsInt) |
| AllElementsInt = ECD->getType() == Context.IntTy; |
| } |
| |
| // Figure out the type that should be used for this enum. |
| // FIXME: Support attribute(packed) on enums and -fshort-enums. |
| QualType BestType; |
| unsigned BestWidth; |
| |
| if (NumNegativeBits) { |
| // If there is a negative value, figure out the smallest integer type (of |
| // int/long/longlong) that fits. |
| if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { |
| BestType = Context.IntTy; |
| BestWidth = IntWidth; |
| } else { |
| BestWidth = Context.Target.getLongWidth(); |
| |
| if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) |
| BestType = Context.LongTy; |
| else { |
| BestWidth = Context.Target.getLongLongWidth(); |
| |
| if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) |
| Diag(Enum->getLocation(), diag::warn_enum_too_large); |
| BestType = Context.LongLongTy; |
| } |
| } |
| } else { |
| // If there is no negative value, figure out which of uint, ulong, ulonglong |
| // fits. |
| if (NumPositiveBits <= IntWidth) { |
| BestType = Context.UnsignedIntTy; |
| BestWidth = IntWidth; |
| } else if (NumPositiveBits <= |
| (BestWidth = Context.Target.getLongWidth())) { |
| BestType = Context.UnsignedLongTy; |
| } else { |
| BestWidth = Context.Target.getLongLongWidth(); |
| assert(NumPositiveBits <= BestWidth && |
| "How could an initializer get larger than ULL?"); |
| BestType = Context.UnsignedLongLongTy; |
| } |
| } |
| |
| // Loop over all of the enumerator constants, changing their types to match |
| // the type of the enum if needed. |
| for (unsigned i = 0; i != NumElements; ++i) { |
| EnumConstantDecl *ECD = |
| cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); |
| if (!ECD) continue; // Already issued a diagnostic. |
| |
| // Standard C says the enumerators have int type, but we allow, as an |
| // extension, the enumerators to be larger than int size. If each |
| // enumerator value fits in an int, type it as an int, otherwise type it the |
| // same as the enumerator decl itself. This means that in "enum { X = 1U }" |
| // that X has type 'int', not 'unsigned'. |
| if (ECD->getType() == Context.IntTy) { |
| // Make sure the init value is signed. |
| llvm::APSInt IV = ECD->getInitVal(); |
| IV.setIsSigned(true); |
| ECD->setInitVal(IV); |
| |
| if (getLangOptions().CPlusPlus) |
| // C++ [dcl.enum]p4: Following the closing brace of an |
| // enum-specifier, each enumerator has the type of its |
| // enumeration. |
| ECD->setType(EnumType); |
| continue; // Already int type. |
| } |
| |
| // Determine whether the value fits into an int. |
| llvm::APSInt InitVal = ECD->getInitVal(); |
| bool FitsInInt; |
| if (InitVal.isUnsigned() || !InitVal.isNegative()) |
| FitsInInt = InitVal.getActiveBits() < IntWidth; |
| else |
| FitsInInt = InitVal.getMinSignedBits() <= IntWidth; |
| |
| // If it fits into an integer type, force it. Otherwise force it to match |
| // the enum decl type. |
| QualType NewTy; |
| unsigned NewWidth; |
| bool NewSign; |
| if (FitsInInt) { |
| NewTy = Context.IntTy; |
| NewWidth = IntWidth; |
| NewSign = true; |
| } else if (ECD->getType() == BestType) { |
| // Already the right type! |
| if (getLangOptions().CPlusPlus) |
| // C++ [dcl.enum]p4: Following the closing brace of an |
| // enum-specifier, each enumerator has the type of its |
| // enumeration. |
| ECD->setType(EnumType); |
| continue; |
| } else { |
| NewTy = BestType; |
| NewWidth = BestWidth; |
| NewSign = BestType->isSignedIntegerType(); |
| } |
| |
| // Adjust the APSInt value. |
| InitVal.extOrTrunc(NewWidth); |
| InitVal.setIsSigned(NewSign); |
| ECD->setInitVal(InitVal); |
| |
| // Adjust the Expr initializer and type. |
| if (ECD->getInitExpr()) |
| ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), |
| /*isLvalue=*/false)); |
| if (getLangOptions().CPlusPlus) |
| // C++ [dcl.enum]p4: Following the closing brace of an |
| // enum-specifier, each enumerator has the type of its |
| // enumeration. |
| ECD->setType(EnumType); |
| else |
| ECD->setType(NewTy); |
| } |
| |
| Enum->completeDefinition(Context, BestType); |
| } |
| |
| Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, |
| ExprArg expr) { |
| StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); |
| |
| return DeclPtrTy::make(FileScopeAsmDecl::Create(Context, CurContext, |
| Loc, AsmString)); |
| } |