//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the C++ Declaration portions of the Parser interfaces. // //===----------------------------------------------------------------------===// #include "clang/Parse/Parser.h" #include "RAIIObjectsForParser.h" #include "clang/Basic/CharInfo.h" #include "clang/Basic/OperatorKinds.h" #include "clang/AST/DeclTemplate.h" #include "clang/Parse/ParseDiagnostic.h" #include "clang/Sema/DeclSpec.h" #include "clang/Sema/ParsedTemplate.h" #include "clang/Sema/PrettyDeclStackTrace.h" #include "clang/Sema/Scope.h" #include "clang/Sema/SemaDiagnostic.h" #include "llvm/ADT/SmallString.h" using namespace clang; /// ParseNamespace - We know that the current token is a namespace keyword. This /// may either be a top level namespace or a block-level namespace alias. If /// there was an inline keyword, it has already been parsed. /// /// namespace-definition: [C++ 7.3: basic.namespace] /// named-namespace-definition /// unnamed-namespace-definition /// /// unnamed-namespace-definition: /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' /// /// named-namespace-definition: /// original-namespace-definition /// extension-namespace-definition /// /// original-namespace-definition: /// 'inline'[opt] 'namespace' identifier attributes[opt] /// '{' namespace-body '}' /// /// extension-namespace-definition: /// 'inline'[opt] 'namespace' original-namespace-name /// '{' namespace-body '}' /// /// namespace-alias-definition: [C++ 7.3.2: namespace.alias] /// 'namespace' identifier '=' qualified-namespace-specifier ';' /// Decl *Parser::ParseNamespace(unsigned Context, SourceLocation &DeclEnd, SourceLocation InlineLoc) { assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. ObjCDeclContextSwitch ObjCDC(*this); if (Tok.is(tok::code_completion)) { Actions.CodeCompleteNamespaceDecl(getCurScope()); cutOffParsing(); return 0; } SourceLocation IdentLoc; IdentifierInfo *Ident = 0; std::vector ExtraIdentLoc; std::vector ExtraIdent; std::vector ExtraNamespaceLoc; Token attrTok; if (Tok.is(tok::identifier)) { Ident = Tok.getIdentifierInfo(); IdentLoc = ConsumeToken(); // eat the identifier. while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { ExtraNamespaceLoc.push_back(ConsumeToken()); ExtraIdent.push_back(Tok.getIdentifierInfo()); ExtraIdentLoc.push_back(ConsumeToken()); } } // Read label attributes, if present. ParsedAttributes attrs(AttrFactory); if (Tok.is(tok::kw___attribute)) { attrTok = Tok; ParseGNUAttributes(attrs); } if (Tok.is(tok::equal)) { if (Ident == 0) { Diag(Tok, diag::err_expected_ident); // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return 0; } if (!attrs.empty()) Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); if (InlineLoc.isValid()) Diag(InlineLoc, diag::err_inline_namespace_alias) << FixItHint::CreateRemoval(InlineLoc); return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); } BalancedDelimiterTracker T(*this, tok::l_brace); if (T.consumeOpen()) { if (!ExtraIdent.empty()) { Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); } Diag(Tok, Ident ? diag::err_expected_lbrace : diag::err_expected_ident_lbrace); return 0; } if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || getCurScope()->getFnParent()) { if (!ExtraIdent.empty()) { Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); } Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); SkipUntil(tok::r_brace); return 0; } if (!ExtraIdent.empty()) { TentativeParsingAction TPA(*this); SkipUntil(tok::r_brace, StopBeforeMatch); Token rBraceToken = Tok; TPA.Revert(); if (!rBraceToken.is(tok::r_brace)) { Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); } else { std::string NamespaceFix; for (std::vector::iterator I = ExtraIdent.begin(), E = ExtraIdent.end(); I != E; ++I) { NamespaceFix += " { namespace "; NamespaceFix += (*I)->getName(); } std::string RBraces; for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) RBraces += "} "; Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()), NamespaceFix) << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); } } // If we're still good, complain about inline namespaces in non-C++0x now. if (InlineLoc.isValid()) Diag(InlineLoc, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace); // Enter a scope for the namespace. ParseScope NamespaceScope(this, Scope::DeclScope); Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, IdentLoc, Ident, T.getOpenLocation(), attrs.getList()); PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, "parsing namespace"); // Parse the contents of the namespace. This includes parsing recovery on // any improperly nested namespaces. ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, InlineLoc, attrs, T); // Leave the namespace scope. NamespaceScope.Exit(); DeclEnd = T.getCloseLocation(); Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); return NamespcDecl; } /// ParseInnerNamespace - Parse the contents of a namespace. void Parser::ParseInnerNamespace(std::vector& IdentLoc, std::vector& Ident, std::vector& NamespaceLoc, unsigned int index, SourceLocation& InlineLoc, ParsedAttributes& attrs, BalancedDelimiterTracker &Tracker) { if (index == Ident.size()) { while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(attrs); MaybeParseMicrosoftAttributes(attrs); ParseExternalDeclaration(attrs); } // The caller is what called check -- we are simply calling // the close for it. Tracker.consumeClose(); return; } // Parse improperly nested namespaces. ParseScope NamespaceScope(this, Scope::DeclScope); Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), NamespaceLoc[index], IdentLoc[index], Ident[index], Tracker.getOpenLocation(), attrs.getList()); ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, attrs, Tracker); NamespaceScope.Exit(); Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); } /// ParseNamespaceAlias - Parse the part after the '=' in a namespace /// alias definition. /// Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, SourceLocation AliasLoc, IdentifierInfo *Alias, SourceLocation &DeclEnd) { assert(Tok.is(tok::equal) && "Not equal token"); ConsumeToken(); // eat the '='. if (Tok.is(tok::code_completion)) { Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); cutOffParsing(); return 0; } CXXScopeSpec SS; // Parse (optional) nested-name-specifier. ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); if (SS.isInvalid() || Tok.isNot(tok::identifier)) { Diag(Tok, diag::err_expected_namespace_name); // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return 0; } // Parse identifier. IdentifierInfo *Ident = Tok.getIdentifierInfo(); SourceLocation IdentLoc = ConsumeToken(); // Eat the ';'. DeclEnd = Tok.getLocation(); ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, "", tok::semi); return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, SS, IdentLoc, Ident); } /// ParseLinkage - We know that the current token is a string_literal /// and just before that, that extern was seen. /// /// linkage-specification: [C++ 7.5p2: dcl.link] /// 'extern' string-literal '{' declaration-seq[opt] '}' /// 'extern' string-literal declaration /// Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { assert(Tok.is(tok::string_literal) && "Not a string literal!"); SmallString<8> LangBuffer; bool Invalid = false; StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); if (Invalid) return 0; // FIXME: This is incorrect: linkage-specifiers are parsed in translation // phase 7, so string-literal concatenation is supposed to occur. // extern "" "C" "" "+" "+" { } is legal. if (Tok.hasUDSuffix()) Diag(Tok, diag::err_invalid_string_udl); SourceLocation Loc = ConsumeStringToken(); ParseScope LinkageScope(this, Scope::DeclScope); Decl *LinkageSpec = Actions.ActOnStartLinkageSpecification(getCurScope(), DS.getSourceRange().getBegin(), Loc, Lang, Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation()); ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(attrs); MaybeParseMicrosoftAttributes(attrs); if (Tok.isNot(tok::l_brace)) { // Reset the source range in DS, as the leading "extern" // does not really belong to the inner declaration ... DS.SetRangeStart(SourceLocation()); DS.SetRangeEnd(SourceLocation()); // ... but anyway remember that such an "extern" was seen. DS.setExternInLinkageSpec(true); ParseExternalDeclaration(attrs, &DS); return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, SourceLocation()); } DS.abort(); ProhibitAttributes(attrs); BalancedDelimiterTracker T(*this, tok::l_brace); T.consumeOpen(); while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(attrs); MaybeParseMicrosoftAttributes(attrs); ParseExternalDeclaration(attrs); } T.consumeClose(); return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, T.getCloseLocation()); } /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or /// using-directive. Assumes that current token is 'using'. Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, const ParsedTemplateInfo &TemplateInfo, SourceLocation &DeclEnd, ParsedAttributesWithRange &attrs, Decl **OwnedType) { assert(Tok.is(tok::kw_using) && "Not using token"); ObjCDeclContextSwitch ObjCDC(*this); // Eat 'using'. SourceLocation UsingLoc = ConsumeToken(); if (Tok.is(tok::code_completion)) { Actions.CodeCompleteUsing(getCurScope()); cutOffParsing(); return 0; } // 'using namespace' means this is a using-directive. if (Tok.is(tok::kw_namespace)) { // Template parameters are always an error here. if (TemplateInfo.Kind) { SourceRange R = TemplateInfo.getSourceRange(); Diag(UsingLoc, diag::err_templated_using_directive) << R << FixItHint::CreateRemoval(R); } return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); } // Otherwise, it must be a using-declaration or an alias-declaration. // Using declarations can't have attributes. ProhibitAttributes(attrs); return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, AS_none, OwnedType); } /// ParseUsingDirective - Parse C++ using-directive, assumes /// that current token is 'namespace' and 'using' was already parsed. /// /// using-directive: [C++ 7.3.p4: namespace.udir] /// 'using' 'namespace' ::[opt] nested-name-specifier[opt] /// namespace-name ; /// [GNU] using-directive: /// 'using' 'namespace' ::[opt] nested-name-specifier[opt] /// namespace-name attributes[opt] ; /// Decl *Parser::ParseUsingDirective(unsigned Context, SourceLocation UsingLoc, SourceLocation &DeclEnd, ParsedAttributes &attrs) { assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); // Eat 'namespace'. SourceLocation NamespcLoc = ConsumeToken(); if (Tok.is(tok::code_completion)) { Actions.CodeCompleteUsingDirective(getCurScope()); cutOffParsing(); return 0; } CXXScopeSpec SS; // Parse (optional) nested-name-specifier. ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); IdentifierInfo *NamespcName = 0; SourceLocation IdentLoc = SourceLocation(); // Parse namespace-name. if (SS.isInvalid() || Tok.isNot(tok::identifier)) { Diag(Tok, diag::err_expected_namespace_name); // If there was invalid namespace name, skip to end of decl, and eat ';'. SkipUntil(tok::semi); // FIXME: Are there cases, when we would like to call ActOnUsingDirective? return 0; } // Parse identifier. NamespcName = Tok.getIdentifierInfo(); IdentLoc = ConsumeToken(); // Parse (optional) attributes (most likely GNU strong-using extension). bool GNUAttr = false; if (Tok.is(tok::kw___attribute)) { GNUAttr = true; ParseGNUAttributes(attrs); } // Eat ';'. DeclEnd = Tok.getLocation(); ExpectAndConsume(tok::semi, GNUAttr ? diag::err_expected_semi_after_attribute_list : diag::err_expected_semi_after_namespace_name, "", tok::semi); return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, IdentLoc, NamespcName, attrs.getList()); } /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. /// Assumes that 'using' was already seen. /// /// using-declaration: [C++ 7.3.p3: namespace.udecl] /// 'using' 'typename'[opt] ::[opt] nested-name-specifier /// unqualified-id /// 'using' :: unqualified-id /// /// alias-declaration: C++11 [dcl.dcl]p1 /// 'using' identifier attribute-specifier-seq[opt] = type-id ; /// Decl *Parser::ParseUsingDeclaration(unsigned Context, const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc, SourceLocation &DeclEnd, AccessSpecifier AS, Decl **OwnedType) { CXXScopeSpec SS; SourceLocation TypenameLoc; bool HasTypenameKeyword = false; // Check for misplaced attributes before the identifier in an // alias-declaration. ParsedAttributesWithRange MisplacedAttrs(AttrFactory); MaybeParseCXX11Attributes(MisplacedAttrs); // Ignore optional 'typename'. // FIXME: This is wrong; we should parse this as a typename-specifier. if (Tok.is(tok::kw_typename)) { TypenameLoc = ConsumeToken(); HasTypenameKeyword = true; } // Parse nested-name-specifier. IdentifierInfo *LastII = 0; ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false, /*MayBePseudoDtor=*/0, /*IsTypename=*/false, /*LastII=*/&LastII); // Check nested-name specifier. if (SS.isInvalid()) { SkipUntil(tok::semi); return 0; } SourceLocation TemplateKWLoc; UnqualifiedId Name; // Parse the unqualified-id. We allow parsing of both constructor and // destructor names and allow the action module to diagnose any semantic // errors. // // C++11 [class.qual]p2: // [...] in a using-declaration that is a member-declaration, if the name // specified after the nested-name-specifier is the same as the identifier // or the simple-template-id's template-name in the last component of the // nested-name-specifier, the name is [...] considered to name the // constructor. if (getLangOpts().CPlusPlus11 && Context == Declarator::MemberContext && Tok.is(tok::identifier) && NextToken().is(tok::semi) && SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() && !SS.getScopeRep()->getAsNamespace() && !SS.getScopeRep()->getAsNamespaceAlias()) { SourceLocation IdLoc = ConsumeToken(); ParsedType Type = Actions.getInheritingConstructorName(SS, IdLoc, *LastII); Name.setConstructorName(Type, IdLoc, IdLoc); } else if (ParseUnqualifiedId(SS, /*EnteringContext=*/ false, /*AllowDestructorName=*/ true, /*AllowConstructorName=*/ true, ParsedType(), TemplateKWLoc, Name)) { SkipUntil(tok::semi); return 0; } ParsedAttributesWithRange Attrs(AttrFactory); MaybeParseGNUAttributes(Attrs); MaybeParseCXX11Attributes(Attrs); // Maybe this is an alias-declaration. TypeResult TypeAlias; bool IsAliasDecl = Tok.is(tok::equal); if (IsAliasDecl) { // If we had any misplaced attributes from earlier, this is where they // should have been written. if (MisplacedAttrs.Range.isValid()) { Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed) << FixItHint::CreateInsertionFromRange( Tok.getLocation(), CharSourceRange::getTokenRange(MisplacedAttrs.Range)) << FixItHint::CreateRemoval(MisplacedAttrs.Range); Attrs.takeAllFrom(MisplacedAttrs); } ConsumeToken(); Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_alias_declaration : diag::ext_alias_declaration); // Type alias templates cannot be specialized. int SpecKind = -1; if (TemplateInfo.Kind == ParsedTemplateInfo::Template && Name.getKind() == UnqualifiedId::IK_TemplateId) SpecKind = 0; if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) SpecKind = 1; if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) SpecKind = 2; if (SpecKind != -1) { SourceRange Range; if (SpecKind == 0) Range = SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); else Range = TemplateInfo.getSourceRange(); Diag(Range.getBegin(), diag::err_alias_declaration_specialization) << SpecKind << Range; SkipUntil(tok::semi); return 0; } // Name must be an identifier. if (Name.getKind() != UnqualifiedId::IK_Identifier) { Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); // No removal fixit: can't recover from this. SkipUntil(tok::semi); return 0; } else if (HasTypenameKeyword) Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) << FixItHint::CreateRemoval(SourceRange(TypenameLoc, SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); else if (SS.isNotEmpty()) Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) << FixItHint::CreateRemoval(SS.getRange()); TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? Declarator::AliasTemplateContext : Declarator::AliasDeclContext, AS, OwnedType, &Attrs); } else { // C++11 attributes are not allowed on a using-declaration, but GNU ones // are. ProhibitAttributes(MisplacedAttrs); ProhibitAttributes(Attrs); // Parse (optional) attributes (most likely GNU strong-using extension). MaybeParseGNUAttributes(Attrs); } // Eat ';'. DeclEnd = Tok.getLocation(); ExpectAndConsume(tok::semi, diag::err_expected_semi_after, !Attrs.empty() ? "attributes list" : IsAliasDecl ? "alias declaration" : "using declaration", tok::semi); // Diagnose an attempt to declare a templated using-declaration. // In C++11, alias-declarations can be templates: // template <...> using id = type; if (TemplateInfo.Kind && !IsAliasDecl) { SourceRange R = TemplateInfo.getSourceRange(); Diag(UsingLoc, diag::err_templated_using_declaration) << R << FixItHint::CreateRemoval(R); // Unfortunately, we have to bail out instead of recovering by // ignoring the parameters, just in case the nested name specifier // depends on the parameters. return 0; } // "typename" keyword is allowed for identifiers only, // because it may be a type definition. if (HasTypenameKeyword && Name.getKind() != UnqualifiedId::IK_Identifier) { Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); // Proceed parsing, but reset the HasTypenameKeyword flag. HasTypenameKeyword = false; } if (IsAliasDecl) { TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; MultiTemplateParamsArg TemplateParamsArg( TemplateParams ? TemplateParams->data() : 0, TemplateParams ? TemplateParams->size() : 0); return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, UsingLoc, Name, Attrs.getList(), TypeAlias); } return Actions.ActOnUsingDeclaration(getCurScope(), AS, /* HasUsingKeyword */ true, UsingLoc, SS, Name, Attrs.getList(), HasTypenameKeyword, TypenameLoc); } /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration. /// /// [C++0x] static_assert-declaration: /// static_assert ( constant-expression , string-literal ) ; /// /// [C11] static_assert-declaration: /// _Static_assert ( constant-expression , string-literal ) ; /// Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && "Not a static_assert declaration"); if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11) Diag(Tok, diag::ext_c11_static_assert); if (Tok.is(tok::kw_static_assert)) Diag(Tok, diag::warn_cxx98_compat_static_assert); SourceLocation StaticAssertLoc = ConsumeToken(); BalancedDelimiterTracker T(*this, tok::l_paren); if (T.consumeOpen()) { Diag(Tok, diag::err_expected_lparen); SkipMalformedDecl(); return 0; } ExprResult AssertExpr(ParseConstantExpression()); if (AssertExpr.isInvalid()) { SkipMalformedDecl(); return 0; } if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) return 0; if (!isTokenStringLiteral()) { Diag(Tok, diag::err_expected_string_literal) << /*Source='static_assert'*/1; SkipMalformedDecl(); return 0; } ExprResult AssertMessage(ParseStringLiteralExpression()); if (AssertMessage.isInvalid()) { SkipMalformedDecl(); return 0; } T.consumeClose(); DeclEnd = Tok.getLocation(); ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, AssertExpr.take(), AssertMessage.take(), T.getCloseLocation()); } /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier. /// /// 'decltype' ( expression ) /// 'decltype' ( 'auto' ) [C++1y] /// SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) { assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) && "Not a decltype specifier"); ExprResult Result; SourceLocation StartLoc = Tok.getLocation(); SourceLocation EndLoc; if (Tok.is(tok::annot_decltype)) { Result = getExprAnnotation(Tok); EndLoc = Tok.getAnnotationEndLoc(); ConsumeToken(); if (Result.isInvalid()) { DS.SetTypeSpecError(); return EndLoc; } } else { if (Tok.getIdentifierInfo()->isStr("decltype")) Diag(Tok, diag::warn_cxx98_compat_decltype); ConsumeToken(); BalancedDelimiterTracker T(*this, tok::l_paren); if (T.expectAndConsume(diag::err_expected_lparen_after, "decltype", tok::r_paren)) { DS.SetTypeSpecError(); return T.getOpenLocation() == Tok.getLocation() ? StartLoc : T.getOpenLocation(); } // Check for C++1y 'decltype(auto)'. if (Tok.is(tok::kw_auto)) { // No need to disambiguate here: an expression can't start with 'auto', // because the typename-specifier in a function-style cast operation can't // be 'auto'. Diag(Tok.getLocation(), getLangOpts().CPlusPlus1y ? diag::warn_cxx11_compat_decltype_auto_type_specifier : diag::ext_decltype_auto_type_specifier); ConsumeToken(); } else { // Parse the expression // C++11 [dcl.type.simple]p4: // The operand of the decltype specifier is an unevaluated operand. EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 0, /*IsDecltype=*/true); Result = ParseExpression(); if (Result.isInvalid()) { DS.SetTypeSpecError(); if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) { EndLoc = ConsumeParen(); } else { if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) { // Backtrack to get the location of the last token before the semi. PP.RevertCachedTokens(2); ConsumeToken(); // the semi. EndLoc = ConsumeAnyToken(); assert(Tok.is(tok::semi)); } else { EndLoc = Tok.getLocation(); } } return EndLoc; } Result = Actions.ActOnDecltypeExpression(Result.take()); } // Match the ')' T.consumeClose(); if (T.getCloseLocation().isInvalid()) { DS.SetTypeSpecError(); // FIXME: this should return the location of the last token // that was consumed (by "consumeClose()") return T.getCloseLocation(); } if (Result.isInvalid()) { DS.SetTypeSpecError(); return T.getCloseLocation(); } EndLoc = T.getCloseLocation(); } assert(!Result.isInvalid()); const char *PrevSpec = 0; unsigned DiagID; // Check for duplicate type specifiers (e.g. "int decltype(a)"). if (Result.get() ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, DiagID, Result.release()) : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec, DiagID)) { Diag(StartLoc, DiagID) << PrevSpec; DS.SetTypeSpecError(); } return EndLoc; } void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS, SourceLocation StartLoc, SourceLocation EndLoc) { // make sure we have a token we can turn into an annotation token if (PP.isBacktrackEnabled()) PP.RevertCachedTokens(1); else PP.EnterToken(Tok); Tok.setKind(tok::annot_decltype); setExprAnnotation(Tok, DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() : DS.getTypeSpecType() == TST_decltype_auto ? ExprResult() : ExprError()); Tok.setAnnotationEndLoc(EndLoc); Tok.setLocation(StartLoc); PP.AnnotateCachedTokens(Tok); } void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { assert(Tok.is(tok::kw___underlying_type) && "Not an underlying type specifier"); SourceLocation StartLoc = ConsumeToken(); BalancedDelimiterTracker T(*this, tok::l_paren); if (T.expectAndConsume(diag::err_expected_lparen_after, "__underlying_type", tok::r_paren)) { return; } TypeResult Result = ParseTypeName(); if (Result.isInvalid()) { SkipUntil(tok::r_paren, StopAtSemi); return; } // Match the ')' T.consumeClose(); if (T.getCloseLocation().isInvalid()) return; const char *PrevSpec = 0; unsigned DiagID; if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, DiagID, Result.release())) Diag(StartLoc, DiagID) << PrevSpec; DS.setTypeofParensRange(T.getRange()); } /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a /// class name or decltype-specifier. Note that we only check that the result /// names a type; semantic analysis will need to verify that the type names a /// class. The result is either a type or null, depending on whether a type /// name was found. /// /// base-type-specifier: [C++11 class.derived] /// class-or-decltype /// class-or-decltype: [C++11 class.derived] /// nested-name-specifier[opt] class-name /// decltype-specifier /// class-name: [C++ class.name] /// identifier /// simple-template-id /// /// In C++98, instead of base-type-specifier, we have: /// /// ::[opt] nested-name-specifier[opt] class-name Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc, SourceLocation &EndLocation) { // Ignore attempts to use typename if (Tok.is(tok::kw_typename)) { Diag(Tok, diag::err_expected_class_name_not_template) << FixItHint::CreateRemoval(Tok.getLocation()); ConsumeToken(); } // Parse optional nested-name-specifier CXXScopeSpec SS; ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); BaseLoc = Tok.getLocation(); // Parse decltype-specifier // tok == kw_decltype is just error recovery, it can only happen when SS // isn't empty if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) { if (SS.isNotEmpty()) Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype) << FixItHint::CreateRemoval(SS.getRange()); // Fake up a Declarator to use with ActOnTypeName. DeclSpec DS(AttrFactory); EndLocation = ParseDecltypeSpecifier(DS); Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); } // Check whether we have a template-id that names a type. if (Tok.is(tok::annot_template_id)) { TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); if (TemplateId->Kind == TNK_Type_template || TemplateId->Kind == TNK_Dependent_template_name) { AnnotateTemplateIdTokenAsType(); assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); ParsedType Type = getTypeAnnotation(Tok); EndLocation = Tok.getAnnotationEndLoc(); ConsumeToken(); if (Type) return Type; return true; } // Fall through to produce an error below. } if (Tok.isNot(tok::identifier)) { Diag(Tok, diag::err_expected_class_name); return true; } IdentifierInfo *Id = Tok.getIdentifierInfo(); SourceLocation IdLoc = ConsumeToken(); if (Tok.is(tok::less)) { // It looks the user intended to write a template-id here, but the // template-name was wrong. Try to fix that. TemplateNameKind TNK = TNK_Type_template; TemplateTy Template; if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), &SS, Template, TNK)) { Diag(IdLoc, diag::err_unknown_template_name) << Id; } if (!Template) { TemplateArgList TemplateArgs; SourceLocation LAngleLoc, RAngleLoc; ParseTemplateIdAfterTemplateName(TemplateTy(), IdLoc, SS, true, LAngleLoc, TemplateArgs, RAngleLoc); return true; } // Form the template name UnqualifiedId TemplateName; TemplateName.setIdentifier(Id, IdLoc); // Parse the full template-id, then turn it into a type. if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(), TemplateName, true)) return true; if (TNK == TNK_Dependent_template_name) AnnotateTemplateIdTokenAsType(); // If we didn't end up with a typename token, there's nothing more we // can do. if (Tok.isNot(tok::annot_typename)) return true; // Retrieve the type from the annotation token, consume that token, and // return. EndLocation = Tok.getAnnotationEndLoc(); ParsedType Type = getTypeAnnotation(Tok); ConsumeToken(); return Type; } // We have an identifier; check whether it is actually a type. IdentifierInfo *CorrectedII = 0; ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, false, ParsedType(), /*IsCtorOrDtorName=*/false, /*NonTrivialTypeSourceInfo=*/true, &CorrectedII); if (!Type) { Diag(IdLoc, diag::err_expected_class_name); return true; } // Consume the identifier. EndLocation = IdLoc; // Fake up a Declarator to use with ActOnTypeName. DeclSpec DS(AttrFactory); DS.SetRangeStart(IdLoc); DS.SetRangeEnd(EndLocation); DS.getTypeSpecScope() = SS; const char *PrevSpec = 0; unsigned DiagID; DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); } void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) { while (Tok.is(tok::kw___single_inheritance) || Tok.is(tok::kw___multiple_inheritance) || Tok.is(tok::kw___virtual_inheritance)) { IdentifierInfo *AttrName = Tok.getIdentifierInfo(); SourceLocation AttrNameLoc = ConsumeToken(); attrs.addNew(AttrName, AttrNameLoc, 0, AttrNameLoc, 0, 0, AttributeList::AS_GNU); } } /// Determine whether the following tokens are valid after a type-specifier /// which could be a standalone declaration. This will conservatively return /// true if there's any doubt, and is appropriate for insert-';' fixits. bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) { // This switch enumerates the valid "follow" set for type-specifiers. switch (Tok.getKind()) { default: break; case tok::semi: // struct foo {...} ; case tok::star: // struct foo {...} * P; case tok::amp: // struct foo {...} & R = ... case tok::ampamp: // struct foo {...} && R = ... case tok::identifier: // struct foo {...} V ; case tok::r_paren: //(struct foo {...} ) {4} case tok::annot_cxxscope: // struct foo {...} a:: b; case tok::annot_typename: // struct foo {...} a ::b; case tok::annot_template_id: // struct foo {...} a ::b; case tok::l_paren: // struct foo {...} ( x); case tok::comma: // __builtin_offsetof(struct foo{...} , case tok::kw_operator: // struct foo operator ++() {...} return true; case tok::colon: return CouldBeBitfield; // enum E { ... } : 2; // Type qualifiers case tok::kw_const: // struct foo {...} const x; case tok::kw_volatile: // struct foo {...} volatile x; case tok::kw_restrict: // struct foo {...} restrict x; // Function specifiers // Note, no 'explicit'. An explicit function must be either a conversion // operator or a constructor. Either way, it can't have a return type. case tok::kw_inline: // struct foo inline f(); case tok::kw_virtual: // struct foo virtual f(); case tok::kw_friend: // struct foo friend f(); // Storage-class specifiers case tok::kw_static: // struct foo {...} static x; case tok::kw_extern: // struct foo {...} extern x; case tok::kw_typedef: // struct foo {...} typedef x; case tok::kw_register: // struct foo {...} register x; case tok::kw_auto: // struct foo {...} auto x; case tok::kw_mutable: // struct foo {...} mutable x; case tok::kw_thread_local: // struct foo {...} thread_local x; case tok::kw_constexpr: // struct foo {...} constexpr x; // As shown above, type qualifiers and storage class specifiers absolutely // can occur after class specifiers according to the grammar. However, // almost no one actually writes code like this. If we see one of these, // it is much more likely that someone missed a semi colon and the // type/storage class specifier we're seeing is part of the *next* // intended declaration, as in: // // struct foo { ... } // typedef int X; // // We'd really like to emit a missing semicolon error instead of emitting // an error on the 'int' saying that you can't have two type specifiers in // the same declaration of X. Because of this, we look ahead past this // token to see if it's a type specifier. If so, we know the code is // otherwise invalid, so we can produce the expected semi error. if (!isKnownToBeTypeSpecifier(NextToken())) return true; break; case tok::r_brace: // struct bar { struct foo {...} } // Missing ';' at end of struct is accepted as an extension in C mode. if (!getLangOpts().CPlusPlus) return true; break; // C++11 attributes case tok::l_square: // enum E [[]] x // Note, no tok::kw_alignas here; alignas cannot appertain to a type. return getLangOpts().CPlusPlus11 && NextToken().is(tok::l_square); case tok::greater: // template return getLangOpts().CPlusPlus; } return false; } /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which /// until we reach the start of a definition or see a token that /// cannot start a definition. /// /// class-specifier: [C++ class] /// class-head '{' member-specification[opt] '}' /// class-head '{' member-specification[opt] '}' attributes[opt] /// class-head: /// class-key identifier[opt] base-clause[opt] /// class-key nested-name-specifier identifier base-clause[opt] /// class-key nested-name-specifier[opt] simple-template-id /// base-clause[opt] /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] /// [GNU] class-key attributes[opt] nested-name-specifier /// identifier base-clause[opt] /// [GNU] class-key attributes[opt] nested-name-specifier[opt] /// simple-template-id base-clause[opt] /// class-key: /// 'class' /// 'struct' /// 'union' /// /// elaborated-type-specifier: [C++ dcl.type.elab] /// class-key ::[opt] nested-name-specifier[opt] identifier /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] /// simple-template-id /// /// Note that the C++ class-specifier and elaborated-type-specifier, /// together, subsume the C99 struct-or-union-specifier: /// /// struct-or-union-specifier: [C99 6.7.2.1] /// struct-or-union identifier[opt] '{' struct-contents '}' /// struct-or-union identifier /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents /// '}' attributes[opt] /// [GNU] struct-or-union attributes[opt] identifier /// struct-or-union: /// 'struct' /// 'union' void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, SourceLocation StartLoc, DeclSpec &DS, const ParsedTemplateInfo &TemplateInfo, AccessSpecifier AS, bool EnteringContext, DeclSpecContext DSC, ParsedAttributesWithRange &Attributes) { DeclSpec::TST TagType; if (TagTokKind == tok::kw_struct) TagType = DeclSpec::TST_struct; else if (TagTokKind == tok::kw___interface) TagType = DeclSpec::TST_interface; else if (TagTokKind == tok::kw_class) TagType = DeclSpec::TST_class; else { assert(TagTokKind == tok::kw_union && "Not a class specifier"); TagType = DeclSpec::TST_union; } if (Tok.is(tok::code_completion)) { // Code completion for a struct, class, or union name. Actions.CodeCompleteTag(getCurScope(), TagType); return cutOffParsing(); } // C++03 [temp.explicit] 14.7.2/8: // The usual access checking rules do not apply to names used to specify // explicit instantiations. // // As an extension we do not perform access checking on the names used to // specify explicit specializations either. This is important to allow // specializing traits classes for private types. // // Note that we don't suppress if this turns out to be an elaborated // type specifier. bool shouldDelayDiagsInTag = (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization); SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag); ParsedAttributesWithRange attrs(AttrFactory); // If attributes exist after tag, parse them. MaybeParseGNUAttributes(attrs); // If declspecs exist after tag, parse them. while (Tok.is(tok::kw___declspec)) ParseMicrosoftDeclSpec(attrs); // Parse inheritance specifiers. if (Tok.is(tok::kw___single_inheritance) || Tok.is(tok::kw___multiple_inheritance) || Tok.is(tok::kw___virtual_inheritance)) ParseMicrosoftInheritanceClassAttributes(attrs); // If C++0x attributes exist here, parse them. // FIXME: Are we consistent with the ordering of parsing of different // styles of attributes? MaybeParseCXX11Attributes(attrs); // Source location used by FIXIT to insert misplaced // C++11 attributes SourceLocation AttrFixitLoc = Tok.getLocation(); if (TagType == DeclSpec::TST_struct && !Tok.is(tok::identifier) && Tok.getIdentifierInfo() && (Tok.is(tok::kw___is_arithmetic) || Tok.is(tok::kw___is_convertible) || Tok.is(tok::kw___is_empty) || Tok.is(tok::kw___is_floating_point) || Tok.is(tok::kw___is_function) || Tok.is(tok::kw___is_fundamental) || Tok.is(tok::kw___is_integral) || Tok.is(tok::kw___is_member_function_pointer) || Tok.is(tok::kw___is_member_pointer) || Tok.is(tok::kw___is_pod) || Tok.is(tok::kw___is_pointer) || Tok.is(tok::kw___is_same) || Tok.is(tok::kw___is_scalar) || Tok.is(tok::kw___is_signed) || Tok.is(tok::kw___is_unsigned) || Tok.is(tok::kw___is_void))) { // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the // name of struct templates, but some are keywords in GCC >= 4.3 // and Clang. Therefore, when we see the token sequence "struct // X", make X into a normal identifier rather than a keyword, to // allow libstdc++ 4.2 and libc++ to work properly. Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); Tok.setKind(tok::identifier); } // Parse the (optional) nested-name-specifier. CXXScopeSpec &SS = DS.getTypeSpecScope(); if (getLangOpts().CPlusPlus) { // "FOO : BAR" is not a potential typo for "FOO::BAR". ColonProtectionRAIIObject X(*this); if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext)) DS.SetTypeSpecError(); if (SS.isSet()) if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) Diag(Tok, diag::err_expected_ident); } TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; // Parse the (optional) class name or simple-template-id. IdentifierInfo *Name = 0; SourceLocation NameLoc; TemplateIdAnnotation *TemplateId = 0; if (Tok.is(tok::identifier)) { Name = Tok.getIdentifierInfo(); NameLoc = ConsumeToken(); if (Tok.is(tok::less) && getLangOpts().CPlusPlus) { // The name was supposed to refer to a template, but didn't. // Eat the template argument list and try to continue parsing this as // a class (or template thereof). TemplateArgList TemplateArgs; SourceLocation LAngleLoc, RAngleLoc; if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, true, LAngleLoc, TemplateArgs, RAngleLoc)) { // We couldn't parse the template argument list at all, so don't // try to give any location information for the list. LAngleLoc = RAngleLoc = SourceLocation(); } Diag(NameLoc, diag::err_explicit_spec_non_template) << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) << (TagType == DeclSpec::TST_class? 0 : TagType == DeclSpec::TST_struct? 1 : TagType == DeclSpec::TST_union? 2 : 3) << Name << SourceRange(LAngleLoc, RAngleLoc); // Strip off the last template parameter list if it was empty, since // we've removed its template argument list. if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { if (TemplateParams && TemplateParams->size() > 1) { TemplateParams->pop_back(); } else { TemplateParams = 0; const_cast(TemplateInfo).Kind = ParsedTemplateInfo::NonTemplate; } } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { // Pretend this is just a forward declaration. TemplateParams = 0; const_cast(TemplateInfo).Kind = ParsedTemplateInfo::NonTemplate; const_cast(TemplateInfo).TemplateLoc = SourceLocation(); const_cast(TemplateInfo).ExternLoc = SourceLocation(); } } } else if (Tok.is(tok::annot_template_id)) { TemplateId = takeTemplateIdAnnotation(Tok); NameLoc = ConsumeToken(); if (TemplateId->Kind != TNK_Type_template && TemplateId->Kind != TNK_Dependent_template_name) { // The template-name in the simple-template-id refers to // something other than a class template. Give an appropriate // error message and skip to the ';'. SourceRange Range(NameLoc); if (SS.isNotEmpty()) Range.setBegin(SS.getBeginLoc()); Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) << TemplateId->Name << static_cast(TemplateId->Kind) << Range; DS.SetTypeSpecError(); SkipUntil(tok::semi, StopBeforeMatch); return; } } // There are four options here. // - If we are in a trailing return type, this is always just a reference, // and we must not try to parse a definition. For instance, // [] () -> struct S { }; // does not define a type. // - If we have 'struct foo {...', 'struct foo :...', // 'struct foo final :' or 'struct foo final {', then this is a definition. // - If we have 'struct foo;', then this is either a forward declaration // or a friend declaration, which have to be treated differently. // - Otherwise we have something like 'struct foo xyz', a reference. // // We also detect these erroneous cases to provide better diagnostic for // C++11 attributes parsing. // - attributes follow class name: // struct foo [[]] {}; // - attributes appear before or after 'final': // struct foo [[]] final [[]] {}; // // However, in type-specifier-seq's, things look like declarations but are // just references, e.g. // new struct s; // or // &T::operator struct s; // For these, DSC is DSC_type_specifier. // If there are attributes after class name, parse them. MaybeParseCXX11Attributes(Attributes); Sema::TagUseKind TUK; if (DSC == DSC_trailing) TUK = Sema::TUK_Reference; else if (Tok.is(tok::l_brace) || (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || (isCXX11FinalKeyword() && (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) { if (DS.isFriendSpecified()) { // C++ [class.friend]p2: // A class shall not be defined in a friend declaration. Diag(Tok.getLocation(), diag::err_friend_decl_defines_type) << SourceRange(DS.getFriendSpecLoc()); // Skip everything up to the semicolon, so that this looks like a proper // friend class (or template thereof) declaration. SkipUntil(tok::semi, StopBeforeMatch); TUK = Sema::TUK_Friend; } else { // Okay, this is a class definition. TUK = Sema::TUK_Definition; } } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) || NextToken().is(tok::kw_alignas))) { // We can't tell if this is a definition or reference // until we skipped the 'final' and C++11 attribute specifiers. TentativeParsingAction PA(*this); // Skip the 'final' keyword. ConsumeToken(); // Skip C++11 attribute specifiers. while (true) { if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) { ConsumeBracket(); if (!SkipUntil(tok::r_square, StopAtSemi)) break; } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) { ConsumeToken(); ConsumeParen(); if (!SkipUntil(tok::r_paren, StopAtSemi)) break; } else { break; } } if (Tok.is(tok::l_brace) || Tok.is(tok::colon)) TUK = Sema::TUK_Definition; else TUK = Sema::TUK_Reference; PA.Revert(); } else if (DSC != DSC_type_specifier && (Tok.is(tok::semi) || (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) { TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; if (Tok.isNot(tok::semi)) { // A semicolon was missing after this declaration. Diagnose and recover. ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, DeclSpec::getSpecifierName(TagType)); PP.EnterToken(Tok); Tok.setKind(tok::semi); } } else TUK = Sema::TUK_Reference; // Forbid misplaced attributes. In cases of a reference, we pass attributes // to caller to handle. if (TUK != Sema::TUK_Reference) { // If this is not a reference, then the only possible // valid place for C++11 attributes to appear here // is between class-key and class-name. If there are // any attributes after class-name, we try a fixit to move // them to the right place. SourceRange AttrRange = Attributes.Range; if (AttrRange.isValid()) { Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed) << AttrRange << FixItHint::CreateInsertionFromRange(AttrFixitLoc, CharSourceRange(AttrRange, true)) << FixItHint::CreateRemoval(AttrRange); // Recover by adding misplaced attributes to the attribute list // of the class so they can be applied on the class later. attrs.takeAllFrom(Attributes); } } // If this is an elaborated type specifier, and we delayed // diagnostics before, just merge them into the current pool. if (shouldDelayDiagsInTag) { diagsFromTag.done(); if (TUK == Sema::TUK_Reference) diagsFromTag.redelay(); } if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || TUK != Sema::TUK_Definition)) { if (DS.getTypeSpecType() != DeclSpec::TST_error) { // We have a declaration or reference to an anonymous class. Diag(StartLoc, diag::err_anon_type_definition) << DeclSpec::getSpecifierName(TagType); } SkipUntil(tok::comma, StopAtSemi); return; } // Create the tag portion of the class or class template. DeclResult TagOrTempResult = true; // invalid TypeResult TypeResult = true; // invalid bool Owned = false; if (TemplateId) { // Explicit specialization, class template partial specialization, // or explicit instantiation. ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), TemplateId->NumArgs); if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && TUK == Sema::TUK_Declaration) { // This is an explicit instantiation of a class template. ProhibitAttributes(attrs); TagOrTempResult = Actions.ActOnExplicitInstantiation(getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, TagType, StartLoc, SS, TemplateId->Template, TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr, TemplateId->RAngleLoc, attrs.getList()); // Friend template-ids are treated as references unless // they have template headers, in which case they're ill-formed // (FIXME: "template friend class A::B;"). // We diagnose this error in ActOnClassTemplateSpecialization. } else if (TUK == Sema::TUK_Reference || (TUK == Sema::TUK_Friend && TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { ProhibitAttributes(attrs); TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc, TemplateId->SS, TemplateId->TemplateKWLoc, TemplateId->Template, TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr, TemplateId->RAngleLoc); } else { // This is an explicit specialization or a class template // partial specialization. TemplateParameterLists FakedParamLists; if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { // This looks like an explicit instantiation, because we have // something like // // template class Foo // // but it actually has a definition. Most likely, this was // meant to be an explicit specialization, but the user forgot // the '<>' after 'template'. // It this is friend declaration however, since it cannot have a // template header, it is most likely that the user meant to // remove the 'template' keyword. assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) && "Expected a definition here"); if (TUK == Sema::TUK_Friend) { Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation); TemplateParams = 0; } else { SourceLocation LAngleLoc = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); Diag(TemplateId->TemplateNameLoc, diag::err_explicit_instantiation_with_definition) << SourceRange(TemplateInfo.TemplateLoc) << FixItHint::CreateInsertion(LAngleLoc, "<>"); // Create a fake template parameter list that contains only // "template<>", so that we treat this construct as a class // template specialization. FakedParamLists.push_back(Actions.ActOnTemplateParameterList( 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, 0, 0, LAngleLoc)); TemplateParams = &FakedParamLists; } } // Build the class template specialization. TagOrTempResult = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(), SS, TemplateId->Template, TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr, TemplateId->RAngleLoc, attrs.getList(), MultiTemplateParamsArg( TemplateParams? &(*TemplateParams)[0] : 0, TemplateParams? TemplateParams->size() : 0)); } } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && TUK == Sema::TUK_Declaration) { // Explicit instantiation of a member of a class template // specialization, e.g., // // template struct Outer::Inner; // ProhibitAttributes(attrs); TagOrTempResult = Actions.ActOnExplicitInstantiation(getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, TagType, StartLoc, SS, Name, NameLoc, attrs.getList()); } else if (TUK == Sema::TUK_Friend && TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { ProhibitAttributes(attrs); TagOrTempResult = Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), TagType, StartLoc, SS, Name, NameLoc, attrs.getList(), MultiTemplateParamsArg( TemplateParams? &(*TemplateParams)[0] : 0, TemplateParams? TemplateParams->size() : 0)); } else { if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition) ProhibitAttributes(attrs); if (TUK == Sema::TUK_Definition && TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { // If the declarator-id is not a template-id, issue a diagnostic and // recover by ignoring the 'template' keyword. Diag(Tok, diag::err_template_defn_explicit_instantiation) << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc); TemplateParams = 0; } bool IsDependent = false; // Don't pass down template parameter lists if this is just a tag // reference. For example, we don't need the template parameters here: // template class A *makeA(T t); MultiTemplateParamsArg TParams; if (TUK != Sema::TUK_Reference && TemplateParams) TParams = MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); // Declaration or definition of a class type TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, SS, Name, NameLoc, attrs.getList(), AS, DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent, SourceLocation(), false, clang::TypeResult()); // If ActOnTag said the type was dependent, try again with the // less common call. if (IsDependent) { assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, SS, Name, StartLoc, NameLoc); } } // If there is a body, parse it and inform the actions module. if (TUK == Sema::TUK_Definition) { assert(Tok.is(tok::l_brace) || (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || isCXX11FinalKeyword()); if (getLangOpts().CPlusPlus) ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType, TagOrTempResult.get()); else ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); } const char *PrevSpec = 0; unsigned DiagID; bool Result; if (!TypeResult.isInvalid()) { Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, NameLoc.isValid() ? NameLoc : StartLoc, PrevSpec, DiagID, TypeResult.get()); } else if (!TagOrTempResult.isInvalid()) { Result = DS.SetTypeSpecType(TagType, StartLoc, NameLoc.isValid() ? NameLoc : StartLoc, PrevSpec, DiagID, TagOrTempResult.get(), Owned); } else { DS.SetTypeSpecError(); return; } if (Result) Diag(StartLoc, DiagID) << PrevSpec; // At this point, we've successfully parsed a class-specifier in 'definition' // form (e.g. "struct foo { int x; }". While we could just return here, we're // going to look at what comes after it to improve error recovery. If an // impossible token occurs next, we assume that the programmer forgot a ; at // the end of the declaration and recover that way. // // Also enforce C++ [temp]p3: // In a template-declaration which defines a class, no declarator // is permitted. if (TUK == Sema::TUK_Definition && (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) { if (Tok.isNot(tok::semi)) { ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, DeclSpec::getSpecifierName(TagType)); // Push this token back into the preprocessor and change our current token // to ';' so that the rest of the code recovers as though there were an // ';' after the definition. PP.EnterToken(Tok); Tok.setKind(tok::semi); } } } /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. /// /// base-clause : [C++ class.derived] /// ':' base-specifier-list /// base-specifier-list: /// base-specifier '...'[opt] /// base-specifier-list ',' base-specifier '...'[opt] void Parser::ParseBaseClause(Decl *ClassDecl) { assert(Tok.is(tok::colon) && "Not a base clause"); ConsumeToken(); // Build up an array of parsed base specifiers. SmallVector BaseInfo; while (true) { // Parse a base-specifier. BaseResult Result = ParseBaseSpecifier(ClassDecl); if (Result.isInvalid()) { // Skip the rest of this base specifier, up until the comma or // opening brace. SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch); } else { // Add this to our array of base specifiers. BaseInfo.push_back(Result.get()); } // If the next token is a comma, consume it and keep reading // base-specifiers. if (Tok.isNot(tok::comma)) break; // Consume the comma. ConsumeToken(); } // Attach the base specifiers Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); } /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is /// one entry in the base class list of a class specifier, for example: /// class foo : public bar, virtual private baz { /// 'public bar' and 'virtual private baz' are each base-specifiers. /// /// base-specifier: [C++ class.derived] /// attribute-specifier-seq[opt] base-type-specifier /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt] /// base-type-specifier /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt] /// base-type-specifier Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { bool IsVirtual = false; SourceLocation StartLoc = Tok.getLocation(); ParsedAttributesWithRange Attributes(AttrFactory); MaybeParseCXX11Attributes(Attributes); // Parse the 'virtual' keyword. if (Tok.is(tok::kw_virtual)) { ConsumeToken(); IsVirtual = true; } CheckMisplacedCXX11Attribute(Attributes, StartLoc); // Parse an (optional) access specifier. AccessSpecifier Access = getAccessSpecifierIfPresent(); if (Access != AS_none) ConsumeToken(); CheckMisplacedCXX11Attribute(Attributes, StartLoc); // Parse the 'virtual' keyword (again!), in case it came after the // access specifier. if (Tok.is(tok::kw_virtual)) { SourceLocation VirtualLoc = ConsumeToken(); if (IsVirtual) { // Complain about duplicate 'virtual' Diag(VirtualLoc, diag::err_dup_virtual) << FixItHint::CreateRemoval(VirtualLoc); } IsVirtual = true; } CheckMisplacedCXX11Attribute(Attributes, StartLoc); // Parse the class-name. SourceLocation EndLocation; SourceLocation BaseLoc; TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation); if (BaseType.isInvalid()) return true; // Parse the optional ellipsis (for a pack expansion). The ellipsis is // actually part of the base-specifier-list grammar productions, but we // parse it here for convenience. SourceLocation EllipsisLoc; if (Tok.is(tok::ellipsis)) EllipsisLoc = ConsumeToken(); // Find the complete source range for the base-specifier. SourceRange Range(StartLoc, EndLocation); // Notify semantic analysis that we have parsed a complete // base-specifier. return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual, Access, BaseType.get(), BaseLoc, EllipsisLoc); } /// getAccessSpecifierIfPresent - Determine whether the next token is /// a C++ access-specifier. /// /// access-specifier: [C++ class.derived] /// 'private' /// 'protected' /// 'public' AccessSpecifier Parser::getAccessSpecifierIfPresent() const { switch (Tok.getKind()) { default: return AS_none; case tok::kw_private: return AS_private; case tok::kw_protected: return AS_protected; case tok::kw_public: return AS_public; } } /// \brief If the given declarator has any parts for which parsing has to be /// delayed, e.g., default arguments, create a late-parsed method declaration /// record to handle the parsing at the end of the class definition. void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo, Decl *ThisDecl) { // We just declared a member function. If this member function // has any default arguments, we'll need to parse them later. LateParsedMethodDeclaration *LateMethod = 0; DeclaratorChunk::FunctionTypeInfo &FTI = DeclaratorInfo.getFunctionTypeInfo(); for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { if (!LateMethod) { // Push this method onto the stack of late-parsed method // declarations. LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); getCurrentClass().LateParsedDeclarations.push_back(LateMethod); LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); // Add all of the parameters prior to this one (they don't // have default arguments). LateMethod->DefaultArgs.reserve(FTI.NumArgs); for (unsigned I = 0; I < ParamIdx; ++I) LateMethod->DefaultArgs.push_back( LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); } // Add this parameter to the list of parameters (it may or may // not have a default argument). LateMethod->DefaultArgs.push_back( LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, FTI.ArgInfo[ParamIdx].DefaultArgTokens)); } } } /// isCXX11VirtSpecifier - Determine whether the given token is a C++11 /// virt-specifier. /// /// virt-specifier: /// override /// final VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const { if (!getLangOpts().CPlusPlus) return VirtSpecifiers::VS_None; if (Tok.is(tok::identifier)) { IdentifierInfo *II = Tok.getIdentifierInfo(); // Initialize the contextual keywords. if (!Ident_final) { Ident_final = &PP.getIdentifierTable().get("final"); if (getLangOpts().MicrosoftExt) Ident_sealed = &PP.getIdentifierTable().get("sealed"); Ident_override = &PP.getIdentifierTable().get("override"); } if (II == Ident_override) return VirtSpecifiers::VS_Override; if (II == Ident_sealed) return VirtSpecifiers::VS_Sealed; if (II == Ident_final) return VirtSpecifiers::VS_Final; } return VirtSpecifiers::VS_None; } /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq. /// /// virt-specifier-seq: /// virt-specifier /// virt-specifier-seq virt-specifier void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS, bool IsInterface) { while (true) { VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(); if (Specifier == VirtSpecifiers::VS_None) return; // C++ [class.mem]p8: // A virt-specifier-seq shall contain at most one of each virt-specifier. const char *PrevSpec = 0; if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) << PrevSpec << FixItHint::CreateRemoval(Tok.getLocation()); if (IsInterface && (Specifier == VirtSpecifiers::VS_Final || Specifier == VirtSpecifiers::VS_Sealed)) { Diag(Tok.getLocation(), diag::err_override_control_interface) << VirtSpecifiers::getSpecifierName(Specifier); } else if (Specifier == VirtSpecifiers::VS_Sealed) { Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword); } else { Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_override_control_keyword : diag::ext_override_control_keyword) << VirtSpecifiers::getSpecifierName(Specifier); } ConsumeToken(); } } /// isCXX11FinalKeyword - Determine whether the next token is a C++11 /// contextual 'final' keyword. bool Parser::isCXX11FinalKeyword() const { if (!getLangOpts().CPlusPlus) return false; if (!Tok.is(tok::identifier)) return false; // Initialize the contextual keywords. if (!Ident_final) { Ident_final = &PP.getIdentifierTable().get("final"); if (getLangOpts().MicrosoftExt) Ident_sealed = &PP.getIdentifierTable().get("sealed"); Ident_override = &PP.getIdentifierTable().get("override"); } return Tok.getIdentifierInfo() == Ident_final || Tok.getIdentifierInfo() == Ident_sealed; } /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. /// /// member-declaration: /// decl-specifier-seq[opt] member-declarator-list[opt] ';' /// function-definition ';'[opt] /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] /// using-declaration [TODO] /// [C++0x] static_assert-declaration /// template-declaration /// [GNU] '__extension__' member-declaration /// /// member-declarator-list: /// member-declarator /// member-declarator-list ',' member-declarator /// /// member-declarator: /// declarator virt-specifier-seq[opt] pure-specifier[opt] /// declarator constant-initializer[opt] /// [C++11] declarator brace-or-equal-initializer[opt] /// identifier[opt] ':' constant-expression /// /// virt-specifier-seq: /// virt-specifier /// virt-specifier-seq virt-specifier /// /// virt-specifier: /// override /// final /// [MS] sealed /// /// pure-specifier: /// '= 0' /// /// constant-initializer: /// '=' constant-expression /// void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, AttributeList *AccessAttrs, const ParsedTemplateInfo &TemplateInfo, ParsingDeclRAIIObject *TemplateDiags) { if (Tok.is(tok::at)) { if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) Diag(Tok, diag::err_at_defs_cxx); else Diag(Tok, diag::err_at_in_class); ConsumeToken(); SkipUntil(tok::r_brace, StopAtSemi); return; } // Access declarations. bool MalformedTypeSpec = false; if (!TemplateInfo.Kind && (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))) { if (TryAnnotateCXXScopeToken()) MalformedTypeSpec = true; bool isAccessDecl; if (Tok.isNot(tok::annot_cxxscope)) isAccessDecl = false; else if (NextToken().is(tok::identifier)) isAccessDecl = GetLookAheadToken(2).is(tok::semi); else isAccessDecl = NextToken().is(tok::kw_operator); if (isAccessDecl) { // Collect the scope specifier token we annotated earlier. CXXScopeSpec SS; ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); // Try to parse an unqualified-id. SourceLocation TemplateKWLoc; UnqualifiedId Name; if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), TemplateKWLoc, Name)) { SkipUntil(tok::semi); return; } // TODO: recover from mistakenly-qualified operator declarations. if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, "access declaration", tok::semi)) return; Actions.ActOnUsingDeclaration(getCurScope(), AS, /* HasUsingKeyword */ false, SourceLocation(), SS, Name, /* AttrList */ 0, /* HasTypenameKeyword */ false, SourceLocation()); return; } } // static_assert-declaration if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { // FIXME: Check for templates SourceLocation DeclEnd; ParseStaticAssertDeclaration(DeclEnd); return; } if (Tok.is(tok::kw_template)) { assert(!TemplateInfo.TemplateParams && "Nested template improperly parsed?"); SourceLocation DeclEnd; ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, AS, AccessAttrs); return; } // Handle: member-declaration ::= '__extension__' member-declaration if (Tok.is(tok::kw___extension__)) { // __extension__ silences extension warnings in the subexpression. ExtensionRAIIObject O(Diags); // Use RAII to do this. ConsumeToken(); return ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo, TemplateDiags); } // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it // is a bitfield. ColonProtectionRAIIObject X(*this); ParsedAttributesWithRange attrs(AttrFactory); ParsedAttributesWithRange FnAttrs(AttrFactory); // Optional C++11 attribute-specifier MaybeParseCXX11Attributes(attrs); // We need to keep these attributes for future diagnostic // before they are taken over by declaration specifier. FnAttrs.addAll(attrs.getList()); FnAttrs.Range = attrs.Range; MaybeParseMicrosoftAttributes(attrs); if (Tok.is(tok::kw_using)) { ProhibitAttributes(attrs); // Eat 'using'. SourceLocation UsingLoc = ConsumeToken(); if (Tok.is(tok::kw_namespace)) { Diag(UsingLoc, diag::err_using_namespace_in_class); SkipUntil(tok::semi, StopBeforeMatch); } else { SourceLocation DeclEnd; // Otherwise, it must be a using-declaration or an alias-declaration. ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, UsingLoc, DeclEnd, AS); } return; } // Hold late-parsed attributes so we can attach a Decl to them later. LateParsedAttrList CommonLateParsedAttrs; // decl-specifier-seq: // Parse the common declaration-specifiers piece. ParsingDeclSpec DS(*this, TemplateDiags); DS.takeAttributesFrom(attrs); if (MalformedTypeSpec) DS.SetTypeSpecError(); ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class, &CommonLateParsedAttrs); // If we had a free-standing type definition with a missing semicolon, we // may get this far before the problem becomes obvious. if (DS.hasTagDefinition() && TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate && DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_class, &CommonLateParsedAttrs)) return; MultiTemplateParamsArg TemplateParams( TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); if (Tok.is(tok::semi)) { ConsumeToken(); if (DS.isFriendSpecified()) ProhibitAttributes(FnAttrs); Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); DS.complete(TheDecl); return; } ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); VirtSpecifiers VS; // Hold late-parsed attributes so we can attach a Decl to them later. LateParsedAttrList LateParsedAttrs; SourceLocation EqualLoc; bool HasInitializer = false; ExprResult Init; if (Tok.isNot(tok::colon)) { // Don't parse FOO:BAR as if it were a typo for FOO::BAR. ColonProtectionRAIIObject X(*this); // Parse the first declarator. ParseDeclarator(DeclaratorInfo); // Error parsing the declarator? if (!DeclaratorInfo.hasName()) { // If so, skip until the semi-colon or a }. SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); if (Tok.is(tok::semi)) ConsumeToken(); return; } ParseOptionalCXX11VirtSpecifierSeq(VS, getCurrentClass().IsInterface); // If attributes exist after the declarator, but before an '{', parse them. MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); // MSVC permits pure specifier on inline functions declared at class scope. // Hence check for =0 before checking for function definition. if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) && DeclaratorInfo.isFunctionDeclarator() && NextToken().is(tok::numeric_constant)) { EqualLoc = ConsumeToken(); Init = ParseInitializer(); if (Init.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); else HasInitializer = true; } FunctionDefinitionKind DefinitionKind = FDK_Declaration; // function-definition: // // In C++11, a non-function declarator followed by an open brace is a // braced-init-list for an in-class member initialization, not an // erroneous function definition. if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) { DefinitionKind = FDK_Definition; } else if (DeclaratorInfo.isFunctionDeclarator()) { if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { DefinitionKind = FDK_Definition; } else if (Tok.is(tok::equal)) { const Token &KW = NextToken(); if (KW.is(tok::kw_default)) DefinitionKind = FDK_Defaulted; else if (KW.is(tok::kw_delete)) DefinitionKind = FDK_Deleted; } } // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains // to a friend declaration, that declaration shall be a definition. if (DeclaratorInfo.isFunctionDeclarator() && DefinitionKind != FDK_Definition && DS.isFriendSpecified()) { // Diagnose attributes that appear before decl specifier: // [[]] friend int foo(); ProhibitAttributes(FnAttrs); } if (DefinitionKind) { if (!DeclaratorInfo.isFunctionDeclarator()) { Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params); ConsumeBrace(); SkipUntil(tok::r_brace); // Consume the optional ';' if (Tok.is(tok::semi)) ConsumeToken(); return; } if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_function_declared_typedef); // Recover by treating the 'typedef' as spurious. DS.ClearStorageClassSpecs(); } Decl *FunDecl = ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo, VS, DefinitionKind, Init); if (FunDecl) { for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) { CommonLateParsedAttrs[i]->addDecl(FunDecl); } for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { LateParsedAttrs[i]->addDecl(FunDecl); } } LateParsedAttrs.clear(); // Consume the ';' - it's optional unless we have a delete or default if (Tok.is(tok::semi)) ConsumeExtraSemi(AfterMemberFunctionDefinition); return; } } // member-declarator-list: // member-declarator // member-declarator-list ',' member-declarator SmallVector DeclsInGroup; ExprResult BitfieldSize; bool ExpectSemi = true; while (1) { // member-declarator: // declarator pure-specifier[opt] // declarator brace-or-equal-initializer[opt] // identifier[opt] ':' constant-expression if (Tok.is(tok::colon)) { ConsumeToken(); BitfieldSize = ParseConstantExpression(); if (BitfieldSize.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); } // If a simple-asm-expr is present, parse it. if (Tok.is(tok::kw_asm)) { SourceLocation Loc; ExprResult AsmLabel(ParseSimpleAsm(&Loc)); if (AsmLabel.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); DeclaratorInfo.setAsmLabel(AsmLabel.release()); DeclaratorInfo.SetRangeEnd(Loc); } // If attributes exist after the declarator, parse them. MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); // FIXME: When g++ adds support for this, we'll need to check whether it // goes before or after the GNU attributes and __asm__. ParseOptionalCXX11VirtSpecifierSeq(VS, getCurrentClass().IsInterface); InClassInitStyle HasInClassInit = ICIS_NoInit; if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) { if (BitfieldSize.get()) { Diag(Tok, diag::err_bitfield_member_init); SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); } else { HasInitializer = true; if (!DeclaratorInfo.isDeclarationOfFunction() && DeclaratorInfo.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit; } } // NOTE: If Sema is the Action module and declarator is an instance field, // this call will *not* return the created decl; It will return null. // See Sema::ActOnCXXMemberDeclarator for details. NamedDecl *ThisDecl = 0; if (DS.isFriendSpecified()) { // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains // to a friend declaration, that declaration shall be a definition. // // Diagnose attributes appear after friend member function declarator: // foo [[]] (); SmallVector Ranges; DeclaratorInfo.getCXX11AttributeRanges(Ranges); if (!Ranges.empty()) { for (SmallVectorImpl::iterator I = Ranges.begin(), E = Ranges.end(); I != E; ++I) { Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I; } } // TODO: handle initializers, bitfields, 'delete' ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, TemplateParams); } else { ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, DeclaratorInfo, TemplateParams, BitfieldSize.release(), VS, HasInClassInit); if (VarTemplateDecl *VT = ThisDecl ? dyn_cast(ThisDecl) : 0) // Re-direct this decl to refer to the templated decl so that we can // initialize it. ThisDecl = VT->getTemplatedDecl(); if (ThisDecl && AccessAttrs) Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs); } // Handle the initializer. if (HasInClassInit != ICIS_NoInit && DeclaratorInfo.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) { // The initializer was deferred; parse it and cache the tokens. Diag(Tok, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_nonstatic_member_init : diag::ext_nonstatic_member_init); if (DeclaratorInfo.isArrayOfUnknownBound()) { // C++11 [dcl.array]p3: An array bound may also be omitted when the // declarator is followed by an initializer. // // A brace-or-equal-initializer for a member-declarator is not an // initializer in the grammar, so this is ill-formed. Diag(Tok, diag::err_incomplete_array_member_init); SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); // Avoid later warnings about a class member of incomplete type. if (ThisDecl) ThisDecl->setInvalidDecl(); } else ParseCXXNonStaticMemberInitializer(ThisDecl); } else if (HasInitializer) { // Normal initializer. if (!Init.isUsable()) Init = ParseCXXMemberInitializer( ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); if (Init.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); else if (ThisDecl) Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(), DS.containsPlaceholderType()); } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) // No initializer. Actions.ActOnUninitializedDecl(ThisDecl, DS.containsPlaceholderType()); if (ThisDecl) { if (!ThisDecl->isInvalidDecl()) { // Set the Decl for any late parsed attributes for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) CommonLateParsedAttrs[i]->addDecl(ThisDecl); for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) LateParsedAttrs[i]->addDecl(ThisDecl); } Actions.FinalizeDeclaration(ThisDecl); DeclsInGroup.push_back(ThisDecl); if (DeclaratorInfo.isFunctionDeclarator() && DeclaratorInfo.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl); } LateParsedAttrs.clear(); DeclaratorInfo.complete(ThisDecl); // If we don't have a comma, it is either the end of the list (a ';') // or an error, bail out. if (Tok.isNot(tok::comma)) break; // Consume the comma. SourceLocation CommaLoc = ConsumeToken(); if (Tok.isAtStartOfLine() && !MightBeDeclarator(Declarator::MemberContext)) { // This comma was followed by a line-break and something which can't be // the start of a declarator. The comma was probably a typo for a // semicolon. Diag(CommaLoc, diag::err_expected_semi_declaration) << FixItHint::CreateReplacement(CommaLoc, ";"); ExpectSemi = false; break; } // Parse the next declarator. DeclaratorInfo.clear(); VS.clear(); BitfieldSize = true; Init = true; HasInitializer = false; DeclaratorInfo.setCommaLoc(CommaLoc); // Attributes are only allowed on the second declarator. MaybeParseGNUAttributes(DeclaratorInfo); if (Tok.isNot(tok::colon)) ParseDeclarator(DeclaratorInfo); } if (ExpectSemi && ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { // Skip to end of block or statement. SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); // If we stopped at a ';', eat it. if (Tok.is(tok::semi)) ConsumeToken(); return; } Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup); } /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or /// pure-specifier. Also detect and reject any attempted defaulted/deleted /// function definition. The location of the '=', if any, will be placed in /// EqualLoc. /// /// pure-specifier: /// '= 0' /// /// brace-or-equal-initializer: /// '=' initializer-expression /// braced-init-list /// /// initializer-clause: /// assignment-expression /// braced-init-list /// /// defaulted/deleted function-definition: /// '=' 'default' /// '=' 'delete' /// /// Prior to C++0x, the assignment-expression in an initializer-clause must /// be a constant-expression. ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction, SourceLocation &EqualLoc) { assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && "Data member initializer not starting with '=' or '{'"); EnterExpressionEvaluationContext Context(Actions, Sema::PotentiallyEvaluated, D); if (Tok.is(tok::equal)) { EqualLoc = ConsumeToken(); if (Tok.is(tok::kw_delete)) { // In principle, an initializer of '= delete p;' is legal, but it will // never type-check. It's better to diagnose it as an ill-formed expression // than as an ill-formed deleted non-function member. // An initializer of '= delete p, foo' will never be parsed, because // a top-level comma always ends the initializer expression. const Token &Next = NextToken(); if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || Next.is(tok::eof)) { if (IsFunction) Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) << 1 /* delete */; else Diag(ConsumeToken(), diag::err_deleted_non_function); return ExprResult(); } } else if (Tok.is(tok::kw_default)) { if (IsFunction) Diag(Tok, diag::err_default_delete_in_multiple_declaration) << 0 /* default */; else Diag(ConsumeToken(), diag::err_default_special_members); return ExprResult(); } } return ParseInitializer(); } /// ParseCXXMemberSpecification - Parse the class definition. /// /// member-specification: /// member-declaration member-specification[opt] /// access-specifier ':' member-specification[opt] /// void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, SourceLocation AttrFixitLoc, ParsedAttributesWithRange &Attrs, unsigned TagType, Decl *TagDecl) { assert((TagType == DeclSpec::TST_struct || TagType == DeclSpec::TST_interface || TagType == DeclSpec::TST_union || TagType == DeclSpec::TST_class) && "Invalid TagType!"); PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, "parsing struct/union/class body"); // Determine whether this is a non-nested class. Note that local // classes are *not* considered to be nested classes. bool NonNestedClass = true; if (!ClassStack.empty()) { for (const Scope *S = getCurScope(); S; S = S->getParent()) { if (S->isClassScope()) { // We're inside a class scope, so this is a nested class. NonNestedClass = false; // The Microsoft extension __interface does not permit nested classes. if (getCurrentClass().IsInterface) { Diag(RecordLoc, diag::err_invalid_member_in_interface) << /*ErrorType=*/6 << (isa(TagDecl) ? cast(TagDecl)->getQualifiedNameAsString() : ""); } break; } if ((S->getFlags() & Scope::FnScope)) { // If we're in a function or function template declared in the // body of a class, then this is a local class rather than a // nested class. const Scope *Parent = S->getParent(); if (Parent->isTemplateParamScope()) Parent = Parent->getParent(); if (Parent->isClassScope()) break; } } } // Enter a scope for the class. ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); // Note that we are parsing a new (potentially-nested) class definition. ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass, TagType == DeclSpec::TST_interface); if (TagDecl) Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); SourceLocation FinalLoc; bool IsFinalSpelledSealed = false; // Parse the optional 'final' keyword. if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) { VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok); assert((Specifier == VirtSpecifiers::VS_Final || Specifier == VirtSpecifiers::VS_Sealed) && "not a class definition"); FinalLoc = ConsumeToken(); IsFinalSpelledSealed = Specifier == VirtSpecifiers::VS_Sealed; if (TagType == DeclSpec::TST_interface) Diag(FinalLoc, diag::err_override_control_interface) << VirtSpecifiers::getSpecifierName(Specifier); else if (Specifier == VirtSpecifiers::VS_Final) Diag(FinalLoc, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_override_control_keyword : diag::ext_override_control_keyword) << VirtSpecifiers::getSpecifierName(Specifier); else if (Specifier == VirtSpecifiers::VS_Sealed) Diag(FinalLoc, diag::ext_ms_sealed_keyword); // Parse any C++11 attributes after 'final' keyword. // These attributes are not allowed to appear here, // and the only possible place for them to appertain // to the class would be between class-key and class-name. CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc); } if (Tok.is(tok::colon)) { ParseBaseClause(TagDecl); if (!Tok.is(tok::l_brace)) { Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); if (TagDecl) Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); return; } } assert(Tok.is(tok::l_brace)); BalancedDelimiterTracker T(*this, tok::l_brace); T.consumeOpen(); if (TagDecl) Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, IsFinalSpelledSealed, T.getOpenLocation()); // C++ 11p3: Members of a class defined with the keyword class are private // by default. Members of a class defined with the keywords struct or union // are public by default. AccessSpecifier CurAS; if (TagType == DeclSpec::TST_class) CurAS = AS_private; else CurAS = AS_public; ParsedAttributes AccessAttrs(AttrFactory); if (TagDecl) { // While we still have something to read, read the member-declarations. while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { // Each iteration of this loop reads one member-declaration. if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); continue; } // Check for extraneous top-level semicolon. if (Tok.is(tok::semi)) { ConsumeExtraSemi(InsideStruct, TagType); continue; } if (Tok.is(tok::annot_pragma_vis)) { HandlePragmaVisibility(); continue; } if (Tok.is(tok::annot_pragma_pack)) { HandlePragmaPack(); continue; } if (Tok.is(tok::annot_pragma_align)) { HandlePragmaAlign(); continue; } if (Tok.is(tok::annot_pragma_openmp)) { ParseOpenMPDeclarativeDirective(); continue; } // If we see a namespace here, a close brace was missing somewhere. if (Tok.is(tok::kw_namespace)) { DiagnoseUnexpectedNamespace(cast(TagDecl)); break; } AccessSpecifier AS = getAccessSpecifierIfPresent(); if (AS != AS_none) { // Current token is a C++ access specifier. CurAS = AS; SourceLocation ASLoc = Tok.getLocation(); unsigned TokLength = Tok.getLength(); ConsumeToken(); AccessAttrs.clear(); MaybeParseGNUAttributes(AccessAttrs); SourceLocation EndLoc; if (Tok.is(tok::colon)) { EndLoc = Tok.getLocation(); ConsumeToken(); } else if (Tok.is(tok::semi)) { EndLoc = Tok.getLocation(); ConsumeToken(); Diag(EndLoc, diag::err_expected_colon) << FixItHint::CreateReplacement(EndLoc, ":"); } else { EndLoc = ASLoc.getLocWithOffset(TokLength); Diag(EndLoc, diag::err_expected_colon) << FixItHint::CreateInsertion(EndLoc, ":"); } // The Microsoft extension __interface does not permit non-public // access specifiers. if (TagType == DeclSpec::TST_interface && CurAS != AS_public) { Diag(ASLoc, diag::err_access_specifier_interface) << (CurAS == AS_protected); } if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc, AccessAttrs.getList())) { // found another attribute than only annotations AccessAttrs.clear(); } continue; } // Parse all the comma separated declarators. ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList()); } T.consumeClose(); } else { SkipUntil(tok::r_brace); } // If attributes exist after class contents, parse them. ParsedAttributes attrs(AttrFactory); MaybeParseGNUAttributes(attrs); if (TagDecl) Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, T.getOpenLocation(), T.getCloseLocation(), attrs.getList()); // C++11 [class.mem]p2: // Within the class member-specification, the class is regarded as complete // within function bodies, default arguments, and // brace-or-equal-initializers for non-static data members (including such // things in nested classes). if (TagDecl && NonNestedClass) { // We are not inside a nested class. This class and its nested classes // are complete and we can parse the delayed portions of method // declarations and the lexed inline method definitions, along with any // delayed attributes. SourceLocation SavedPrevTokLocation = PrevTokLocation; ParseLexedAttributes(getCurrentClass()); ParseLexedMethodDeclarations(getCurrentClass()); // We've finished with all pending member declarations. Actions.ActOnFinishCXXMemberDecls(); ParseLexedMemberInitializers(getCurrentClass()); ParseLexedMethodDefs(getCurrentClass()); PrevTokLocation = SavedPrevTokLocation; } if (TagDecl) Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getCloseLocation()); // Leave the class scope. ParsingDef.Pop(); ClassScope.Exit(); } void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) { assert(Tok.is(tok::kw_namespace)); // FIXME: Suggest where the close brace should have gone by looking // at indentation changes within the definition body. Diag(D->getLocation(), diag::err_missing_end_of_definition) << D; Diag(Tok.getLocation(), diag::note_missing_end_of_definition_before) << D; // Push '};' onto the token stream to recover. PP.EnterToken(Tok); Tok.startToken(); Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation)); Tok.setKind(tok::semi); PP.EnterToken(Tok); Tok.setKind(tok::r_brace); } /// ParseConstructorInitializer - Parse a C++ constructor initializer, /// which explicitly initializes the members or base classes of a /// class (C++ [class.base.init]). For example, the three initializers /// after the ':' in the Derived constructor below: /// /// @code /// class Base { }; /// class Derived : Base { /// int x; /// float f; /// public: /// Derived(float f) : Base(), x(17), f(f) { } /// }; /// @endcode /// /// [C++] ctor-initializer: /// ':' mem-initializer-list /// /// [C++] mem-initializer-list: /// mem-initializer ...[opt] /// mem-initializer ...[opt] , mem-initializer-list void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); // Poison the SEH identifiers so they are flagged as illegal in constructor initializers PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); SourceLocation ColonLoc = ConsumeToken(); SmallVector MemInitializers; bool AnyErrors = false; do { if (Tok.is(tok::code_completion)) { Actions.CodeCompleteConstructorInitializer(ConstructorDecl, MemInitializers); return cutOffParsing(); } else { MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); if (!MemInit.isInvalid()) MemInitializers.push_back(MemInit.get()); else AnyErrors = true; } if (Tok.is(tok::comma)) ConsumeToken(); else if (Tok.is(tok::l_brace)) break; // If the next token looks like a base or member initializer, assume that // we're just missing a comma. else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); Diag(Loc, diag::err_ctor_init_missing_comma) << FixItHint::CreateInsertion(Loc, ", "); } else { // Skip over garbage, until we get to '{'. Don't eat the '{'. Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch); break; } } while (true); Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers, AnyErrors); } /// ParseMemInitializer - Parse a C++ member initializer, which is /// part of a constructor initializer that explicitly initializes one /// member or base class (C++ [class.base.init]). See /// ParseConstructorInitializer for an example. /// /// [C++] mem-initializer: /// mem-initializer-id '(' expression-list[opt] ')' /// [C++0x] mem-initializer-id braced-init-list /// /// [C++] mem-initializer-id: /// '::'[opt] nested-name-specifier[opt] class-name /// identifier Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { // parse '::'[opt] nested-name-specifier[opt] CXXScopeSpec SS; ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); ParsedType TemplateTypeTy; if (Tok.is(tok::annot_template_id)) { TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); if (TemplateId->Kind == TNK_Type_template || TemplateId->Kind == TNK_Dependent_template_name) { AnnotateTemplateIdTokenAsType(); assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); TemplateTypeTy = getTypeAnnotation(Tok); } } // Uses of decltype will already have been converted to annot_decltype by // ParseOptionalCXXScopeSpecifier at this point. if (!TemplateTypeTy && Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_decltype)) { Diag(Tok, diag::err_expected_member_or_base_name); return true; } IdentifierInfo *II = 0; DeclSpec DS(AttrFactory); SourceLocation IdLoc = Tok.getLocation(); if (Tok.is(tok::annot_decltype)) { // Get the decltype expression, if there is one. ParseDecltypeSpecifier(DS); } else { if (Tok.is(tok::identifier)) // Get the identifier. This may be a member name or a class name, // but we'll let the semantic analysis determine which it is. II = Tok.getIdentifierInfo(); ConsumeToken(); } // Parse the '('. if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); ExprResult InitList = ParseBraceInitializer(); if (InitList.isInvalid()) return true; SourceLocation EllipsisLoc; if (Tok.is(tok::ellipsis)) EllipsisLoc = ConsumeToken(); return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, TemplateTypeTy, DS, IdLoc, InitList.take(), EllipsisLoc); } else if(Tok.is(tok::l_paren)) { BalancedDelimiterTracker T(*this, tok::l_paren); T.consumeOpen(); // Parse the optional expression-list. ExprVector ArgExprs; CommaLocsTy CommaLocs; if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { SkipUntil(tok::r_paren, StopAtSemi); return true; } T.consumeClose(); SourceLocation EllipsisLoc; if (Tok.is(tok::ellipsis)) EllipsisLoc = ConsumeToken(); return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, TemplateTypeTy, DS, IdLoc, T.getOpenLocation(), ArgExprs, T.getCloseLocation(), EllipsisLoc); } Diag(Tok, getLangOpts().CPlusPlus11 ? diag::err_expected_lparen_or_lbrace : diag::err_expected_lparen); return true; } /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). /// /// exception-specification: /// dynamic-exception-specification /// noexcept-specification /// /// noexcept-specification: /// 'noexcept' /// 'noexcept' '(' constant-expression ')' ExceptionSpecificationType Parser::tryParseExceptionSpecification( SourceRange &SpecificationRange, SmallVectorImpl &DynamicExceptions, SmallVectorImpl &DynamicExceptionRanges, ExprResult &NoexceptExpr) { ExceptionSpecificationType Result = EST_None; // See if there's a dynamic specification. if (Tok.is(tok::kw_throw)) { Result = ParseDynamicExceptionSpecification(SpecificationRange, DynamicExceptions, DynamicExceptionRanges); assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && "Produced different number of exception types and ranges."); } // If there's no noexcept specification, we're done. if (Tok.isNot(tok::kw_noexcept)) return Result; Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); // If we already had a dynamic specification, parse the noexcept for, // recovery, but emit a diagnostic and don't store the results. SourceRange NoexceptRange; ExceptionSpecificationType NoexceptType = EST_None; SourceLocation KeywordLoc = ConsumeToken(); if (Tok.is(tok::l_paren)) { // There is an argument. BalancedDelimiterTracker T(*this, tok::l_paren); T.consumeOpen(); NoexceptType = EST_ComputedNoexcept; NoexceptExpr = ParseConstantExpression(); // The argument must be contextually convertible to bool. We use // ActOnBooleanCondition for this purpose. if (!NoexceptExpr.isInvalid()) NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, NoexceptExpr.get()); T.consumeClose(); NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); } else { // There is no argument. NoexceptType = EST_BasicNoexcept; NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); } if (Result == EST_None) { SpecificationRange = NoexceptRange; Result = NoexceptType; // If there's a dynamic specification after a noexcept specification, // parse that and ignore the results. if (Tok.is(tok::kw_throw)) { Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, DynamicExceptionRanges); } } else { Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); } return Result; } static void diagnoseDynamicExceptionSpecification( Parser &P, const SourceRange &Range, bool IsNoexcept) { if (P.getLangOpts().CPlusPlus11) { const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)"; P.Diag(Range.getBegin(), diag::warn_exception_spec_deprecated) << Range; P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated) << Replacement << FixItHint::CreateReplacement(Range, Replacement); } } /// ParseDynamicExceptionSpecification - Parse a C++ /// dynamic-exception-specification (C++ [except.spec]). /// /// dynamic-exception-specification: /// 'throw' '(' type-id-list [opt] ')' /// [MS] 'throw' '(' '...' ')' /// /// type-id-list: /// type-id ... [opt] /// type-id-list ',' type-id ... [opt] /// ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( SourceRange &SpecificationRange, SmallVectorImpl &Exceptions, SmallVectorImpl &Ranges) { assert(Tok.is(tok::kw_throw) && "expected throw"); SpecificationRange.setBegin(ConsumeToken()); BalancedDelimiterTracker T(*this, tok::l_paren); if (T.consumeOpen()) { Diag(Tok, diag::err_expected_lparen_after) << "throw"; SpecificationRange.setEnd(SpecificationRange.getBegin()); return EST_DynamicNone; } // Parse throw(...), a Microsoft extension that means "this function // can throw anything". if (Tok.is(tok::ellipsis)) { SourceLocation EllipsisLoc = ConsumeToken(); if (!getLangOpts().MicrosoftExt) Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); T.consumeClose(); SpecificationRange.setEnd(T.getCloseLocation()); diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false); return EST_MSAny; } // Parse the sequence of type-ids. SourceRange Range; while (Tok.isNot(tok::r_paren)) { TypeResult Res(ParseTypeName(&Range)); if (Tok.is(tok::ellipsis)) { // C++0x [temp.variadic]p5: // - In a dynamic-exception-specification (15.4); the pattern is a // type-id. SourceLocation Ellipsis = ConsumeToken(); Range.setEnd(Ellipsis); if (!Res.isInvalid()) Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); } if (!Res.isInvalid()) { Exceptions.push_back(Res.get()); Ranges.push_back(Range); } if (Tok.is(tok::comma)) ConsumeToken(); else break; } T.consumeClose(); SpecificationRange.setEnd(T.getCloseLocation()); diagnoseDynamicExceptionSpecification(*this, SpecificationRange, Exceptions.empty()); return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; } /// ParseTrailingReturnType - Parse a trailing return type on a new-style /// function declaration. TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { assert(Tok.is(tok::arrow) && "expected arrow"); ConsumeToken(); return ParseTypeName(&Range, Declarator::TrailingReturnContext); } /// \brief We have just started parsing the definition of a new class, /// so push that class onto our stack of classes that is currently /// being parsed. Sema::ParsingClassState Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass, bool IsInterface) { assert((NonNestedClass || !ClassStack.empty()) && "Nested class without outer class"); ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface)); return Actions.PushParsingClass(); } /// \brief Deallocate the given parsed class and all of its nested /// classes. void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) delete Class->LateParsedDeclarations[I]; delete Class; } /// \brief Pop the top class of the stack of classes that are /// currently being parsed. /// /// This routine should be called when we have finished parsing the /// definition of a class, but have not yet popped the Scope /// associated with the class's definition. void Parser::PopParsingClass(Sema::ParsingClassState state) { assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); Actions.PopParsingClass(state); ParsingClass *Victim = ClassStack.top(); ClassStack.pop(); if (Victim->TopLevelClass) { // Deallocate all of the nested classes of this class, // recursively: we don't need to keep any of this information. DeallocateParsedClasses(Victim); return; } assert(!ClassStack.empty() && "Missing top-level class?"); if (Victim->LateParsedDeclarations.empty()) { // The victim is a nested class, but we will not need to perform // any processing after the definition of this class since it has // no members whose handling was delayed. Therefore, we can just // remove this nested class. DeallocateParsedClasses(Victim); return; } // This nested class has some members that will need to be processed // after the top-level class is completely defined. Therefore, add // it to the list of nested classes within its parent. assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); } /// \brief Try to parse an 'identifier' which appears within an attribute-token. /// /// \return the parsed identifier on success, and 0 if the next token is not an /// attribute-token. /// /// C++11 [dcl.attr.grammar]p3: /// If a keyword or an alternative token that satisfies the syntactic /// requirements of an identifier is contained in an attribute-token, /// it is considered an identifier. IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) { switch (Tok.getKind()) { default: // Identifiers and keywords have identifier info attached. if (IdentifierInfo *II = Tok.getIdentifierInfo()) { Loc = ConsumeToken(); return II; } return 0; case tok::ampamp: // 'and' case tok::pipe: // 'bitor' case tok::pipepipe: // 'or' case tok::caret: // 'xor' case tok::tilde: // 'compl' case tok::amp: // 'bitand' case tok::ampequal: // 'and_eq' case tok::pipeequal: // 'or_eq' case tok::caretequal: // 'xor_eq' case tok::exclaim: // 'not' case tok::exclaimequal: // 'not_eq' // Alternative tokens do not have identifier info, but their spelling // starts with an alphabetical character. SmallString<8> SpellingBuf; StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf); if (isLetter(Spelling[0])) { Loc = ConsumeToken(); return &PP.getIdentifierTable().get(Spelling); } return 0; } } static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName, IdentifierInfo *ScopeName) { switch (AttributeList::getKind(AttrName, ScopeName, AttributeList::AS_CXX11)) { case AttributeList::AT_CarriesDependency: case AttributeList::AT_FallThrough: case AttributeList::AT_CXX11NoReturn: { return true; } default: return false; } } /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently /// only parses standard attributes. /// /// [C++11] attribute-specifier: /// '[' '[' attribute-list ']' ']' /// alignment-specifier /// /// [C++11] attribute-list: /// attribute[opt] /// attribute-list ',' attribute[opt] /// attribute '...' /// attribute-list ',' attribute '...' /// /// [C++11] attribute: /// attribute-token attribute-argument-clause[opt] /// /// [C++11] attribute-token: /// identifier /// attribute-scoped-token /// /// [C++11] attribute-scoped-token: /// attribute-namespace '::' identifier /// /// [C++11] attribute-namespace: /// identifier /// /// [C++11] attribute-argument-clause: /// '(' balanced-token-seq ')' /// /// [C++11] balanced-token-seq: /// balanced-token /// balanced-token-seq balanced-token /// /// [C++11] balanced-token: /// '(' balanced-token-seq ')' /// '[' balanced-token-seq ']' /// '{' balanced-token-seq '}' /// any token but '(', ')', '[', ']', '{', or '}' void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs, SourceLocation *endLoc) { if (Tok.is(tok::kw_alignas)) { Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas); ParseAlignmentSpecifier(attrs, endLoc); return; } assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) && "Not a C++11 attribute list"); Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute); ConsumeBracket(); ConsumeBracket(); llvm::SmallDenseMap SeenAttrs; while (Tok.isNot(tok::r_square)) { // attribute not present if (Tok.is(tok::comma)) { ConsumeToken(); continue; } SourceLocation ScopeLoc, AttrLoc; IdentifierInfo *ScopeName = 0, *AttrName = 0; AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); if (!AttrName) // Break out to the "expected ']'" diagnostic. break; // scoped attribute if (Tok.is(tok::coloncolon)) { ConsumeToken(); ScopeName = AttrName; ScopeLoc = AttrLoc; AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); if (!AttrName) { Diag(Tok.getLocation(), diag::err_expected_ident); SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch); continue; } } bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName,ScopeName); bool AttrParsed = false; if (StandardAttr && !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second) Diag(AttrLoc, diag::err_cxx11_attribute_repeated) << AttrName << SourceRange(SeenAttrs[AttrName]); // Parse attribute arguments if (Tok.is(tok::l_paren)) { if (ScopeName && ScopeName->getName() == "gnu") { ParseGNUAttributeArgs(AttrName, AttrLoc, attrs, endLoc, ScopeName, ScopeLoc, AttributeList::AS_CXX11); AttrParsed = true; } else { if (StandardAttr) Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments) << AttrName->getName(); // FIXME: handle other formats of c++11 attribute arguments ConsumeParen(); SkipUntil(tok::r_paren); } } if (!AttrParsed) attrs.addNew(AttrName, SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, AttrLoc), ScopeName, ScopeLoc, 0, 0, AttributeList::AS_CXX11); if (Tok.is(tok::ellipsis)) { ConsumeToken(); Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis) << AttrName->getName(); } } if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) SkipUntil(tok::r_square); if (endLoc) *endLoc = Tok.getLocation(); if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) SkipUntil(tok::r_square); } /// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq. /// /// attribute-specifier-seq: /// attribute-specifier-seq[opt] attribute-specifier void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs, SourceLocation *endLoc) { assert(getLangOpts().CPlusPlus11); SourceLocation StartLoc = Tok.getLocation(), Loc; if (!endLoc) endLoc = &Loc; do { ParseCXX11AttributeSpecifier(attrs, endLoc); } while (isCXX11AttributeSpecifier()); attrs.Range = SourceRange(StartLoc, *endLoc); } void Parser::DiagnoseAndSkipCXX11Attributes() { if (!isCXX11AttributeSpecifier()) return; // Start and end location of an attribute or an attribute list. SourceLocation StartLoc = Tok.getLocation(); SourceLocation EndLoc; do { if (Tok.is(tok::l_square)) { BalancedDelimiterTracker T(*this, tok::l_square); T.consumeOpen(); T.skipToEnd(); EndLoc = T.getCloseLocation(); } else { assert(Tok.is(tok::kw_alignas) && "not an attribute specifier"); ConsumeToken(); BalancedDelimiterTracker T(*this, tok::l_paren); if (!T.consumeOpen()) T.skipToEnd(); EndLoc = T.getCloseLocation(); } } while (isCXX11AttributeSpecifier()); if (EndLoc.isValid()) { SourceRange Range(StartLoc, EndLoc); Diag(StartLoc, diag::err_attributes_not_allowed) << Range; } } /// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] /// /// [MS] ms-attribute: /// '[' token-seq ']' /// /// [MS] ms-attribute-seq: /// ms-attribute[opt] /// ms-attribute ms-attribute-seq void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, SourceLocation *endLoc) { assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); while (Tok.is(tok::l_square)) { // FIXME: If this is actually a C++11 attribute, parse it as one. ConsumeBracket(); SkipUntil(tok::r_square, StopAtSemi | StopBeforeMatch); if (endLoc) *endLoc = Tok.getLocation(); ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); } } void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, AccessSpecifier& CurAS) { IfExistsCondition Result; if (ParseMicrosoftIfExistsCondition(Result)) return; BalancedDelimiterTracker Braces(*this, tok::l_brace); if (Braces.consumeOpen()) { Diag(Tok, diag::err_expected_lbrace); return; } switch (Result.Behavior) { case IEB_Parse: // Parse the declarations below. break; case IEB_Dependent: Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists) << Result.IsIfExists; // Fall through to skip. case IEB_Skip: Braces.skipToEnd(); return; } while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { // __if_exists, __if_not_exists can nest. if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); continue; } // Check for extraneous top-level semicolon. if (Tok.is(tok::semi)) { ConsumeExtraSemi(InsideStruct, TagType); continue; } AccessSpecifier AS = getAccessSpecifierIfPresent(); if (AS != AS_none) { // Current token is a C++ access specifier. CurAS = AS; SourceLocation ASLoc = Tok.getLocation(); ConsumeToken(); if (Tok.is(tok::colon)) Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); else Diag(Tok, diag::err_expected_colon); ConsumeToken(); continue; } // Parse all the comma separated declarators. ParseCXXClassMemberDeclaration(CurAS, 0); } Braces.consumeClose(); }