//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file implements the C++ Declaration portions of the Parser interfaces. // //===----------------------------------------------------------------------===// #include "clang/Parse/Parser.h" #include "clang/AST/ASTContext.h" #include "clang/AST/DeclTemplate.h" #include "clang/AST/PrettyDeclStackTrace.h" #include "clang/Basic/Attributes.h" #include "clang/Basic/CharInfo.h" #include "clang/Basic/OperatorKinds.h" #include "clang/Basic/TargetInfo.h" #include "clang/Parse/ParseDiagnostic.h" #include "clang/Parse/RAIIObjectsForParser.h" #include "clang/Sema/DeclSpec.h" #include "clang/Sema/ParsedTemplate.h" #include "clang/Sema/Scope.h" #include "llvm/ADT/SmallString.h" #include "llvm/Support/TimeProfiler.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++: namespace.def] /// named-namespace-definition /// unnamed-namespace-definition /// nested-namespace-definition /// /// named-namespace-definition: /// 'inline'[opt] 'namespace' attributes[opt] identifier '{' /// namespace-body '}' /// /// unnamed-namespace-definition: /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' /// /// nested-namespace-definition: /// 'namespace' enclosing-namespace-specifier '::' 'inline'[opt] /// identifier '{' namespace-body '}' /// /// enclosing-namespace-specifier: /// identifier /// enclosing-namespace-specifier '::' 'inline'[opt] identifier /// /// namespace-alias-definition: [C++ 7.3.2: namespace.alias] /// 'namespace' identifier '=' qualified-namespace-specifier ';' /// Parser::DeclGroupPtrTy Parser::ParseNamespace(DeclaratorContext 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 nullptr; } SourceLocation IdentLoc; IdentifierInfo *Ident = nullptr; InnerNamespaceInfoList ExtraNSs; SourceLocation FirstNestedInlineLoc; ParsedAttributesWithRange attrs(AttrFactory); SourceLocation attrLoc; if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) { Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_ns_enum_attribute : diag::ext_ns_enum_attribute) << 0 /*namespace*/; attrLoc = Tok.getLocation(); ParseCXX11Attributes(attrs); } if (Tok.is(tok::identifier)) { Ident = Tok.getIdentifierInfo(); IdentLoc = ConsumeToken(); // eat the identifier. while (Tok.is(tok::coloncolon) && (NextToken().is(tok::identifier) || (NextToken().is(tok::kw_inline) && GetLookAheadToken(2).is(tok::identifier)))) { InnerNamespaceInfo Info; Info.NamespaceLoc = ConsumeToken(); if (Tok.is(tok::kw_inline)) { Info.InlineLoc = ConsumeToken(); if (FirstNestedInlineLoc.isInvalid()) FirstNestedInlineLoc = Info.InlineLoc; } Info.Ident = Tok.getIdentifierInfo(); Info.IdentLoc = ConsumeToken(); ExtraNSs.push_back(Info); } } // A nested namespace definition cannot have attributes. if (!ExtraNSs.empty() && attrLoc.isValid()) Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute); // Read label attributes, if present. if (Tok.is(tok::kw___attribute)) { attrLoc = Tok.getLocation(); ParseGNUAttributes(attrs); } if (Tok.is(tok::equal)) { if (!Ident) { Diag(Tok, diag::err_expected) << tok::identifier; // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return nullptr; } if (attrLoc.isValid()) Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias); if (InlineLoc.isValid()) Diag(InlineLoc, diag::err_inline_namespace_alias) << FixItHint::CreateRemoval(InlineLoc); Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); return Actions.ConvertDeclToDeclGroup(NSAlias); } BalancedDelimiterTracker T(*this, tok::l_brace); if (T.consumeOpen()) { if (Ident) Diag(Tok, diag::err_expected) << tok::l_brace; else Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace; return nullptr; } if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || getCurScope()->getFnParent()) { Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); SkipUntil(tok::r_brace); return nullptr; } if (ExtraNSs.empty()) { // Normal namespace definition, not a nested-namespace-definition. } else if (InlineLoc.isValid()) { Diag(InlineLoc, diag::err_inline_nested_namespace_definition); } else if (getLangOpts().CPlusPlus20) { Diag(ExtraNSs[0].NamespaceLoc, diag::warn_cxx14_compat_nested_namespace_definition); if (FirstNestedInlineLoc.isValid()) Diag(FirstNestedInlineLoc, diag::warn_cxx17_compat_inline_nested_namespace_definition); } else if (getLangOpts().CPlusPlus17) { Diag(ExtraNSs[0].NamespaceLoc, diag::warn_cxx14_compat_nested_namespace_definition); if (FirstNestedInlineLoc.isValid()) Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition); } else { TentativeParsingAction TPA(*this); SkipUntil(tok::r_brace, StopBeforeMatch); Token rBraceToken = Tok; TPA.Revert(); if (!rBraceToken.is(tok::r_brace)) { Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition) << SourceRange(ExtraNSs.front().NamespaceLoc, ExtraNSs.back().IdentLoc); } else { std::string NamespaceFix; for (const auto &ExtraNS : ExtraNSs) { NamespaceFix += " { "; if (ExtraNS.InlineLoc.isValid()) NamespaceFix += "inline "; NamespaceFix += "namespace "; NamespaceFix += ExtraNS.Ident->getName(); } std::string RBraces; for (unsigned i = 0, e = ExtraNSs.size(); i != e; ++i) RBraces += "} "; Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition) << FixItHint::CreateReplacement( SourceRange(ExtraNSs.front().NamespaceLoc, ExtraNSs.back().IdentLoc), NamespaceFix) << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); } // Warn about nested inline namespaces. if (FirstNestedInlineLoc.isValid()) Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition); } // 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); UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr; Decl *NamespcDecl = Actions.ActOnStartNamespaceDef( getCurScope(), InlineLoc, NamespaceLoc, IdentLoc, Ident, T.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl); PrettyDeclStackTraceEntry CrashInfo(Actions.Context, NamespcDecl, NamespaceLoc, "parsing namespace"); // Parse the contents of the namespace. This includes parsing recovery on // any improperly nested namespaces. ParseInnerNamespace(ExtraNSs, 0, InlineLoc, attrs, T); // Leave the namespace scope. NamespaceScope.Exit(); DeclEnd = T.getCloseLocation(); Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); return Actions.ConvertDeclToDeclGroup(NamespcDecl, ImplicitUsingDirectiveDecl); } /// ParseInnerNamespace - Parse the contents of a namespace. void Parser::ParseInnerNamespace(const InnerNamespaceInfoList &InnerNSs, unsigned int index, SourceLocation &InlineLoc, ParsedAttributes &attrs, BalancedDelimiterTracker &Tracker) { if (index == InnerNSs.size()) { while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(attrs); ParseExternalDeclaration(attrs); } // The caller is what called check -- we are simply calling // the close for it. Tracker.consumeClose(); return; } // Handle a nested namespace definition. // FIXME: Preserve the source information through to the AST rather than // desugaring it here. ParseScope NamespaceScope(this, Scope::DeclScope); UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr; Decl *NamespcDecl = Actions.ActOnStartNamespaceDef( getCurScope(), InnerNSs[index].InlineLoc, InnerNSs[index].NamespaceLoc, InnerNSs[index].IdentLoc, InnerNSs[index].Ident, Tracker.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl); assert(!ImplicitUsingDirectiveDecl && "nested namespace definition cannot define anonymous namespace"); ParseInnerNamespace(InnerNSs, ++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 nullptr; } CXXScopeSpec SS; // Parse (optional) nested-name-specifier. ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false, /*MayBePseudoDestructor=*/nullptr, /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true); if (Tok.isNot(tok::identifier)) { Diag(Tok, diag::err_expected_namespace_name); // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return nullptr; } if (SS.isInvalid()) { // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier. // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return nullptr; } // Parse identifier. IdentifierInfo *Ident = Tok.getIdentifierInfo(); SourceLocation IdentLoc = ConsumeToken(); // Eat the ';'. DeclEnd = Tok.getLocation(); if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name)) SkipUntil(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, DeclaratorContext Context) { assert(isTokenStringLiteral() && "Not a string literal!"); ExprResult Lang = ParseStringLiteralExpression(false); ParseScope LinkageScope(this, Scope::DeclScope); Decl *LinkageSpec = Lang.isInvalid() ? nullptr : Actions.ActOnStartLinkageSpecification( getCurScope(), DS.getSourceRange().getBegin(), Lang.get(), Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation()); ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(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 LinkageSpec ? Actions.ActOnFinishLinkageSpecification( getCurScope(), LinkageSpec, SourceLocation()) : nullptr; } DS.abort(); ProhibitAttributes(attrs); BalancedDelimiterTracker T(*this, tok::l_brace); T.consumeOpen(); unsigned NestedModules = 0; while (true) { switch (Tok.getKind()) { case tok::annot_module_begin: ++NestedModules; ParseTopLevelDecl(); continue; case tok::annot_module_end: if (!NestedModules) break; --NestedModules; ParseTopLevelDecl(); continue; case tok::annot_module_include: ParseTopLevelDecl(); continue; case tok::eof: break; case tok::r_brace: if (!NestedModules) break; LLVM_FALLTHROUGH; default: ParsedAttributesWithRange attrs(AttrFactory); MaybeParseCXX11Attributes(attrs); ParseExternalDeclaration(attrs); continue; } break; } T.consumeClose(); return LinkageSpec ? Actions.ActOnFinishLinkageSpecification( getCurScope(), LinkageSpec, T.getCloseLocation()) : nullptr; } /// Parse a C++ Modules TS export-declaration. /// /// export-declaration: /// 'export' declaration /// 'export' '{' declaration-seq[opt] '}' /// Decl *Parser::ParseExportDeclaration() { assert(Tok.is(tok::kw_export)); SourceLocation ExportLoc = ConsumeToken(); ParseScope ExportScope(this, Scope::DeclScope); Decl *ExportDecl = Actions.ActOnStartExportDecl( getCurScope(), ExportLoc, Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation()); if (Tok.isNot(tok::l_brace)) { // FIXME: Factor out a ParseExternalDeclarationWithAttrs. ParsedAttributesWithRange Attrs(AttrFactory); MaybeParseCXX11Attributes(Attrs); MaybeParseMicrosoftAttributes(Attrs); ParseExternalDeclaration(Attrs); return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl, SourceLocation()); } BalancedDelimiterTracker T(*this, tok::l_brace); T.consumeOpen(); // The Modules TS draft says "An export-declaration shall declare at least one // entity", but the intent is that it shall contain at least one declaration. if (Tok.is(tok::r_brace) && getLangOpts().ModulesTS) { Diag(ExportLoc, diag::err_export_empty) << SourceRange(ExportLoc, Tok.getLocation()); } while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { ParsedAttributesWithRange Attrs(AttrFactory); MaybeParseCXX11Attributes(Attrs); MaybeParseMicrosoftAttributes(Attrs); ParseExternalDeclaration(Attrs); } T.consumeClose(); return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl, T.getCloseLocation()); } /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or /// using-directive. Assumes that current token is 'using'. Parser::DeclGroupPtrTy Parser::ParseUsingDirectiveOrDeclaration(DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo, SourceLocation &DeclEnd, ParsedAttributesWithRange &attrs) { 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 nullptr; } // Consume unexpected 'template' keywords. while (Tok.is(tok::kw_template)) { SourceLocation TemplateLoc = ConsumeToken(); Diag(TemplateLoc, diag::err_unexpected_template_after_using) << FixItHint::CreateRemoval(TemplateLoc); } // '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_declaration) << 0 /* directive */ << R << FixItHint::CreateRemoval(R); } Decl *UsingDir = ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); return Actions.ConvertDeclToDeclGroup(UsingDir); } // 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); } /// 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(DeclaratorContext 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 nullptr; } CXXScopeSpec SS; // Parse (optional) nested-name-specifier. ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false, /*MayBePseudoDestructor=*/nullptr, /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true); IdentifierInfo *NamespcName = nullptr; SourceLocation IdentLoc = SourceLocation(); // Parse namespace-name. if (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 nullptr; } if (SS.isInvalid()) { // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier. // Skip to end of the definition and eat the ';'. SkipUntil(tok::semi); return nullptr; } // 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(); if (ExpectAndConsume(tok::semi, GNUAttr ? diag::err_expected_semi_after_attribute_list : diag::err_expected_semi_after_namespace_name)) SkipUntil(tok::semi); return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, IdentLoc, NamespcName, attrs); } /// Parse a using-declarator (or the identifier in a C++11 alias-declaration). /// /// using-declarator: /// 'typename'[opt] nested-name-specifier unqualified-id /// bool Parser::ParseUsingDeclarator(DeclaratorContext Context, UsingDeclarator &D) { D.clear(); // Ignore optional 'typename'. // FIXME: This is wrong; we should parse this as a typename-specifier. TryConsumeToken(tok::kw_typename, D.TypenameLoc); if (Tok.is(tok::kw___super)) { Diag(Tok.getLocation(), diag::err_super_in_using_declaration); return true; } // Parse nested-name-specifier. IdentifierInfo *LastII = nullptr; if (ParseOptionalCXXScopeSpecifier(D.SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false, /*MayBePseudoDtor=*/nullptr, /*IsTypename=*/false, /*LastII=*/&LastII, /*OnlyNamespace=*/false, /*InUsingDeclaration=*/true)) return true; if (D.SS.isInvalid()) return true; // 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 == DeclaratorContext::Member && Tok.is(tok::identifier) && (NextToken().is(tok::semi) || NextToken().is(tok::comma) || NextToken().is(tok::ellipsis)) && D.SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() && !D.SS.getScopeRep()->getAsNamespace() && !D.SS.getScopeRep()->getAsNamespaceAlias()) { SourceLocation IdLoc = ConsumeToken(); ParsedType Type = Actions.getInheritingConstructorName(D.SS, IdLoc, *LastII); D.Name.setConstructorName(Type, IdLoc, IdLoc); } else { if (ParseUnqualifiedId( D.SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false, /*AllowDestructorName=*/true, /*AllowConstructorName=*/ !(Tok.is(tok::identifier) && NextToken().is(tok::equal)), /*AllowDeductionGuide=*/false, nullptr, D.Name)) return true; } if (TryConsumeToken(tok::ellipsis, D.EllipsisLoc)) Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ? diag::warn_cxx17_compat_using_declaration_pack : diag::ext_using_declaration_pack); return false; } /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. /// Assumes that 'using' was already seen. /// /// using-declaration: [C++ 7.3.p3: namespace.udecl] /// 'using' using-declarator-list[opt] ; /// /// using-declarator-list: [C++1z] /// using-declarator '...'[opt] /// using-declarator-list ',' using-declarator '...'[opt] /// /// using-declarator-list: [C++98-14] /// using-declarator /// /// alias-declaration: C++11 [dcl.dcl]p1 /// 'using' identifier attribute-specifier-seq[opt] = type-id ; /// Parser::DeclGroupPtrTy Parser::ParseUsingDeclaration(DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc, SourceLocation &DeclEnd, AccessSpecifier AS) { // Check for misplaced attributes before the identifier in an // alias-declaration. ParsedAttributesWithRange MisplacedAttrs(AttrFactory); MaybeParseCXX11Attributes(MisplacedAttrs); UsingDeclarator D; bool InvalidDeclarator = ParseUsingDeclarator(Context, D); ParsedAttributesWithRange Attrs(AttrFactory); MaybeParseGNUAttributes(Attrs); MaybeParseCXX11Attributes(Attrs); // Maybe this is an alias-declaration. if (Tok.is(tok::equal)) { if (InvalidDeclarator) { SkipUntil(tok::semi); return nullptr; } // 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); } Decl *DeclFromDeclSpec = nullptr; Decl *AD = ParseAliasDeclarationAfterDeclarator( TemplateInfo, UsingLoc, D, DeclEnd, AS, Attrs, &DeclFromDeclSpec); return Actions.ConvertDeclToDeclGroup(AD, DeclFromDeclSpec); } // C++11 attributes are not allowed on a using-declaration, but GNU ones // are. ProhibitAttributes(MisplacedAttrs); ProhibitAttributes(Attrs); // Diagnose an attempt to declare a templated using-declaration. // In C++11, alias-declarations can be templates: // template <...> using id = type; if (TemplateInfo.Kind) { SourceRange R = TemplateInfo.getSourceRange(); Diag(UsingLoc, diag::err_templated_using_directive_declaration) << 1 /* 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 nullptr; } SmallVector DeclsInGroup; while (true) { // Parse (optional) attributes (most likely GNU strong-using extension). MaybeParseGNUAttributes(Attrs); if (InvalidDeclarator) SkipUntil(tok::comma, tok::semi, StopBeforeMatch); else { // "typename" keyword is allowed for identifiers only, // because it may be a type definition. if (D.TypenameLoc.isValid() && D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) { Diag(D.Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) << FixItHint::CreateRemoval(SourceRange(D.TypenameLoc)); // Proceed parsing, but discard the typename keyword. D.TypenameLoc = SourceLocation(); } Decl *UD = Actions.ActOnUsingDeclaration(getCurScope(), AS, UsingLoc, D.TypenameLoc, D.SS, D.Name, D.EllipsisLoc, Attrs); if (UD) DeclsInGroup.push_back(UD); } if (!TryConsumeToken(tok::comma)) break; // Parse another using-declarator. Attrs.clear(); InvalidDeclarator = ParseUsingDeclarator(Context, D); } if (DeclsInGroup.size() > 1) Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ? diag::warn_cxx17_compat_multi_using_declaration : diag::ext_multi_using_declaration); // Eat ';'. DeclEnd = Tok.getLocation(); if (ExpectAndConsume(tok::semi, diag::err_expected_after, !Attrs.empty() ? "attributes list" : "using declaration")) SkipUntil(tok::semi); return Actions.BuildDeclaratorGroup(DeclsInGroup); } Decl *Parser::ParseAliasDeclarationAfterDeclarator( const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc, UsingDeclarator &D, SourceLocation &DeclEnd, AccessSpecifier AS, ParsedAttributes &Attrs, Decl **OwnedType) { if (ExpectAndConsume(tok::equal)) { SkipUntil(tok::semi); return nullptr; } 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 && D.Name.getKind() == UnqualifiedIdKind::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(D.Name.TemplateId->LAngleLoc, D.Name.TemplateId->RAngleLoc); else Range = TemplateInfo.getSourceRange(); Diag(Range.getBegin(), diag::err_alias_declaration_specialization) << SpecKind << Range; SkipUntil(tok::semi); return nullptr; } // Name must be an identifier. if (D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) { Diag(D.Name.StartLocation, diag::err_alias_declaration_not_identifier); // No removal fixit: can't recover from this. SkipUntil(tok::semi); return nullptr; } else if (D.TypenameLoc.isValid()) Diag(D.TypenameLoc, diag::err_alias_declaration_not_identifier) << FixItHint::CreateRemoval(SourceRange( D.TypenameLoc, D.SS.isNotEmpty() ? D.SS.getEndLoc() : D.TypenameLoc)); else if (D.SS.isNotEmpty()) Diag(D.SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) << FixItHint::CreateRemoval(D.SS.getRange()); if (D.EllipsisLoc.isValid()) Diag(D.EllipsisLoc, diag::err_alias_declaration_pack_expansion) << FixItHint::CreateRemoval(SourceRange(D.EllipsisLoc)); Decl *DeclFromDeclSpec = nullptr; TypeResult TypeAlias = ParseTypeName(nullptr, TemplateInfo.Kind ? DeclaratorContext::AliasTemplate : DeclaratorContext::AliasDecl, AS, &DeclFromDeclSpec, &Attrs); if (OwnedType) *OwnedType = DeclFromDeclSpec; // Eat ';'. DeclEnd = Tok.getLocation(); if (ExpectAndConsume(tok::semi, diag::err_expected_after, !Attrs.empty() ? "attributes list" : "alias declaration")) SkipUntil(tok::semi); TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; MultiTemplateParamsArg TemplateParamsArg( TemplateParams ? TemplateParams->data() : nullptr, TemplateParams ? TemplateParams->size() : 0); return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, UsingLoc, D.Name, Attrs, TypeAlias, DeclFromDeclSpec); } /// 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.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) && "Not a static_assert declaration"); if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11) Diag(Tok, diag::ext_c11_feature) << Tok.getName(); 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) << tok::l_paren; SkipMalformedDecl(); return nullptr; } EnterExpressionEvaluationContext ConstantEvaluated( Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated); ExprResult AssertExpr(ParseConstantExpressionInExprEvalContext()); if (AssertExpr.isInvalid()) { SkipMalformedDecl(); return nullptr; } ExprResult AssertMessage; if (Tok.is(tok::r_paren)) { Diag(Tok, getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_static_assert_no_message : diag::ext_static_assert_no_message) << (getLangOpts().CPlusPlus17 ? FixItHint() : FixItHint::CreateInsertion(Tok.getLocation(), ", \"\"")); } else { if (ExpectAndConsume(tok::comma)) { SkipUntil(tok::semi); return nullptr; } if (!isTokenStringLiteral()) { Diag(Tok, diag::err_expected_string_literal) << /*Source='static_assert'*/1; SkipMalformedDecl(); return nullptr; } AssertMessage = ParseStringLiteralExpression(); if (AssertMessage.isInvalid()) { SkipMalformedDecl(); return nullptr; } } T.consumeClose(); DeclEnd = Tok.getLocation(); ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, AssertExpr.get(), AssertMessage.get(), T.getCloseLocation()); } /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier. /// /// 'decltype' ( expression ) /// 'decltype' ( 'auto' ) [C++1y] /// SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) { assert(Tok.isOneOf(tok::kw_decltype, 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(); ConsumeAnnotationToken(); 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().CPlusPlus14 ? 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::ExpressionEvaluationContext::Unevaluated, nullptr, Sema::ExpressionEvaluationContextRecord::EK_Decltype); Result = Actions.CorrectDelayedTyposInExpr( ParseExpression(), /*InitDecl=*/nullptr, /*RecoverUncorrectedTypos=*/false, [](Expr *E) { return E->hasPlaceholderType() ? ExprError() : E; }); 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.get()); } // 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 = nullptr; unsigned DiagID; const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy(); // Check for duplicate type specifiers (e.g. "int decltype(a)"). if (Result.get() ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, DiagID, Result.get(), Policy) : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec, DiagID, Policy)) { 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); if (DS.getTypeSpecType() == TST_error) { // We encountered an error in parsing 'decltype(...)' so lets annotate all // the tokens in the backtracking cache - that we likely had to skip over // to get to a token that allows us to resume parsing, such as a // semi-colon. EndLoc = PP.getLastCachedTokenLocation(); } } else PP.EnterToken(Tok, /*IsReinject*/true); 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 = nullptr; unsigned DiagID; if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, DiagID, Result.get(), Actions.getASTContext().getPrintingPolicy())) 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 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; if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false)) return true; BaseLoc = Tok.getLocation(); // Parse decltype-specifier // tok == kw_decltype is just error recovery, it can only happen when SS // isn't empty if (Tok.isOneOf(tok::kw_decltype, 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, DeclaratorContext::TypeName); 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->mightBeType()) { AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true); assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); TypeResult Type = getTypeAnnotation(Tok); EndLocation = Tok.getAnnotationEndLoc(); ConsumeAnnotationToken(); return Type; } // 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. // FIXME: Invoke ParseOptionalCXXScopeSpecifier in a "'template' is neither // required nor permitted" mode, and do this there. TemplateNameKind TNK = TNK_Non_template; TemplateTy Template; if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), &SS, Template, TNK)) { Diag(IdLoc, diag::err_unknown_template_name) << Id; } // 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)) return true; if (Tok.is(tok::annot_template_id) && takeTemplateIdAnnotation(Tok)->mightBeType()) AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true); // 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(); TypeResult Type = getTypeAnnotation(Tok); ConsumeAnnotationToken(); return Type; } // We have an identifier; check whether it is actually a type. IdentifierInfo *CorrectedII = nullptr; ParsedType Type = Actions.getTypeName( *Id, IdLoc, getCurScope(), &SS, /*isClassName=*/true, false, nullptr, /*IsCtorOrDtorName=*/false, /*WantNontrivialTypeSourceInfo=*/true, /*IsClassTemplateDeductionContext*/ false, &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 = nullptr; unsigned DiagID; DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type, Actions.getASTContext().getPrintingPolicy()); Declarator DeclaratorInfo(DS, DeclaratorContext::TypeName); return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); } void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) { while (Tok.isOneOf(tok::kw___single_inheritance, tok::kw___multiple_inheritance, tok::kw___virtual_inheritance)) { IdentifierInfo *AttrName = Tok.getIdentifierInfo(); SourceLocation AttrNameLoc = ConsumeToken(); attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, ParsedAttr::AS_Keyword); } } /// 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::coloncolon: // struct foo {...} :: a::b; 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::kw_decltype: // struct foo {...} decltype (a)::b; case tok::l_paren: // struct foo {...} ( x); case tok::comma: // __builtin_offsetof(struct foo{...} , case tok::kw_operator: // struct foo operator ++() {...} case tok::kw___declspec: // struct foo {...} __declspec(...) case tok::l_square: // void f(struct f [ 3]) case tok::ellipsis: // void f(struct f ... [Ns]) // FIXME: we should emit semantic diagnostic when declaration // attribute is in type attribute position. case tok::kw___attribute: // struct foo __attribute__((used)) x; case tok::annot_pragma_pack: // struct foo {...} _Pragma(pack(pop)); // struct foo {...} _Pragma(section(...)); case tok::annot_pragma_ms_pragma: // struct foo {...} _Pragma(vtordisp(pop)); case tok::annot_pragma_ms_vtordisp: // struct foo {...} _Pragma(pointers_to_members(...)); case tok::annot_pragma_ms_pointers_to_members: return true; case tok::colon: return CouldBeBitfield || // enum E { ... } : 2; ColonIsSacred; // _Generic(..., enum E : 2); // Microsoft compatibility case tok::kw___cdecl: // struct foo {...} __cdecl x; case tok::kw___fastcall: // struct foo {...} __fastcall x; case tok::kw___stdcall: // struct foo {...} __stdcall x; case tok::kw___thiscall: // struct foo {...} __thiscall x; case tok::kw___vectorcall: // struct foo {...} __vectorcall x; // We will diagnose these calling-convention specifiers on non-function // declarations later, so claim they are valid after a type specifier. return getLangOpts().MicrosoftExt; // 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; case tok::kw__Atomic: // struct foo {...} _Atomic x; case tok::kw___unaligned: // struct foo {...} __unaligned *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; case tok::kw_consteval: // struct foo {...} consteval x; case tok::kw_constinit: // struct foo {...} constinit 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; 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); MaybeParseMicrosoftDeclSpecs(attrs); // Parse inheritance specifiers. if (Tok.isOneOf(tok::kw___single_inheritance, tok::kw___multiple_inheritance, 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.isNot(tok::identifier) && !Tok.isAnnotation() && Tok.getIdentifierInfo() && Tok.isOneOf(tok::kw___is_abstract, tok::kw___is_aggregate, tok::kw___is_arithmetic, tok::kw___is_array, tok::kw___is_assignable, tok::kw___is_base_of, tok::kw___is_class, tok::kw___is_complete_type, tok::kw___is_compound, tok::kw___is_const, tok::kw___is_constructible, tok::kw___is_convertible, tok::kw___is_convertible_to, tok::kw___is_destructible, tok::kw___is_empty, tok::kw___is_enum, tok::kw___is_floating_point, tok::kw___is_final, tok::kw___is_function, tok::kw___is_fundamental, tok::kw___is_integral, tok::kw___is_interface_class, tok::kw___is_literal, tok::kw___is_lvalue_expr, tok::kw___is_lvalue_reference, tok::kw___is_member_function_pointer, tok::kw___is_member_object_pointer, tok::kw___is_member_pointer, tok::kw___is_nothrow_assignable, tok::kw___is_nothrow_constructible, tok::kw___is_nothrow_destructible, tok::kw___is_object, tok::kw___is_pod, tok::kw___is_pointer, tok::kw___is_polymorphic, tok::kw___is_reference, tok::kw___is_rvalue_expr, tok::kw___is_rvalue_reference, tok::kw___is_same, tok::kw___is_scalar, tok::kw___is_sealed, tok::kw___is_signed, tok::kw___is_standard_layout, tok::kw___is_trivial, tok::kw___is_trivially_assignable, tok::kw___is_trivially_constructible, tok::kw___is_trivially_copyable, tok::kw___is_union, tok::kw___is_unsigned, tok::kw___is_void, tok::kw___is_volatile)) // 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. TryKeywordIdentFallback(true); struct PreserveAtomicIdentifierInfoRAII { PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled) : AtomicII(nullptr) { if (!Enabled) return; assert(Tok.is(tok::kw__Atomic)); AtomicII = Tok.getIdentifierInfo(); AtomicII->revertTokenIDToIdentifier(); Tok.setKind(tok::identifier); } ~PreserveAtomicIdentifierInfoRAII() { if (!AtomicII) return; AtomicII->revertIdentifierToTokenID(tok::kw__Atomic); } IdentifierInfo *AtomicII; }; // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL // implementation for VS2013 uses _Atomic as an identifier for one of the // classes in . When we are parsing 'struct _Atomic', don't consider // '_Atomic' to be a keyword. We are careful to undo this so that clang can // use '_Atomic' in its own header files. bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) && TagType == DeclSpec::TST_struct; PreserveAtomicIdentifierInfoRAII AtomicTokenGuard( Tok, ShouldChangeAtomicToIdentifier); // Parse the (optional) nested-name-specifier. CXXScopeSpec &SS = DS.getTypeSpecScope(); if (getLangOpts().CPlusPlus) { // "FOO : BAR" is not a potential typo for "FOO::BAR". In this context it // is a base-specifier-list. ColonProtectionRAIIObject X(*this); CXXScopeSpec Spec; bool HasValidSpec = true; if (ParseOptionalCXXScopeSpecifier(Spec, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, EnteringContext)) { DS.SetTypeSpecError(); HasValidSpec = false; } if (Spec.isSet()) if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) { Diag(Tok, diag::err_expected) << tok::identifier; HasValidSpec = false; } if (HasValidSpec) SS = Spec; } TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; auto RecoverFromUndeclaredTemplateName = [&](IdentifierInfo *Name, SourceLocation NameLoc, SourceRange TemplateArgRange, bool KnownUndeclared) { Diag(NameLoc, diag::err_explicit_spec_non_template) << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) << TagTokKind << Name << TemplateArgRange << KnownUndeclared; // 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->size() > 1) { TemplateParams->pop_back(); } else { TemplateParams = nullptr; const_cast(TemplateInfo).Kind = ParsedTemplateInfo::NonTemplate; } } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { // Pretend this is just a forward declaration. TemplateParams = nullptr; const_cast(TemplateInfo).Kind = ParsedTemplateInfo::NonTemplate; const_cast(TemplateInfo).TemplateLoc = SourceLocation(); const_cast(TemplateInfo).ExternLoc = SourceLocation(); } }; // Parse the (optional) class name or simple-template-id. IdentifierInfo *Name = nullptr; SourceLocation NameLoc; TemplateIdAnnotation *TemplateId = nullptr; 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(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(); } RecoverFromUndeclaredTemplateName( Name, NameLoc, SourceRange(LAngleLoc, RAngleLoc), false); } } else if (Tok.is(tok::annot_template_id)) { TemplateId = takeTemplateIdAnnotation(Tok); NameLoc = ConsumeAnnotationToken(); if (TemplateId->Kind == TNK_Undeclared_template) { // Try to resolve the template name to a type template. May update Kind. Actions.ActOnUndeclaredTypeTemplateName( getCurScope(), TemplateId->Template, TemplateId->Kind, NameLoc, Name); if (TemplateId->Kind == TNK_Undeclared_template) { RecoverFromUndeclaredTemplateName( Name, NameLoc, SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc), true); TemplateId = nullptr; } } if (TemplateId && !TemplateId->mightBeType()) { // The template-name in the simple-template-id refers to // something other than a type template. Give an appropriate // error message and skip to the ';'. SourceRange Range(NameLoc); if (SS.isNotEmpty()) Range.setBegin(SS.getBeginLoc()); // FIXME: Name may be null here. 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 DeclSpecContext::DSC_type_specifier or // DeclSpecContext::DSC_alias_declaration. // If there are attributes after class name, parse them. MaybeParseCXX11Attributes(Attributes); const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy(); Sema::TagUseKind TUK; if (isDefiningTypeSpecifierContext(DSC) == AllowDefiningTypeSpec::No || (getLangOpts().OpenMP && OpenMPDirectiveParsing)) 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.isOneOf(tok::l_brace, tok::colon)) TUK = Sema::TUK_Definition; else TUK = Sema::TUK_Reference; PA.Revert(); } else if (!isTypeSpecifier(DSC) && (Tok.is(tok::semi) || (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) { TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; if (Tok.isNot(tok::semi)) { const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy(); // A semicolon was missing after this declaration. Diagnose and recover. ExpectAndConsume(tok::semi, diag::err_expected_after, DeclSpec::getSpecifierName(TagType, PPol)); PP.EnterToken(Tok, /*IsReinject*/true); 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, Policy); } // If we are parsing a definition and stop at a base-clause, continue on // until the semicolon. Continuing from the comma will just trick us into // thinking we are seeing a variable declaration. if (TUK == Sema::TUK_Definition && Tok.is(tok::colon)) SkipUntil(tok::semi, StopBeforeMatch); else 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; Sema::SkipBodyInfo SkipBody; if (TemplateId) { // Explicit specialization, class template partial specialization, // or explicit instantiation. ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), TemplateId->NumArgs); if (TemplateId->isInvalid()) { // Can't build the declaration. } else 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); // 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, 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 = nullptr; } 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, None, LAngleLoc, nullptr)); TemplateParams = &FakedParamLists; } } // Build the class template specialization. TagOrTempResult = Actions.ActOnClassTemplateSpecialization( getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(), SS, *TemplateId, attrs, MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0] : nullptr, TemplateParams ? TemplateParams->size() : 0), &SkipBody); } } 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); } else if (TUK == Sema::TUK_Friend && TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { ProhibitAttributes(attrs); TagOrTempResult = Actions.ActOnTemplatedFriendTag( getCurScope(), DS.getFriendSpecLoc(), TagType, StartLoc, SS, Name, NameLoc, attrs, MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0] : nullptr, 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 = nullptr; } 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()); stripTypeAttributesOffDeclSpec(attrs, DS, TUK); // Declaration or definition of a class type TagOrTempResult = Actions.ActOnTag( getCurScope(), TagType, TUK, StartLoc, SS, Name, NameLoc, attrs, AS, DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent, SourceLocation(), false, clang::TypeResult(), DSC == DeclSpecContext::DSC_type_specifier, DSC == DeclSpecContext::DSC_template_param || DSC == DeclSpecContext::DSC_template_type_arg, &SkipBody); // 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 (SkipBody.ShouldSkip) SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType, TagOrTempResult.get()); else if (getLangOpts().CPlusPlus) ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType, TagOrTempResult.get()); else { Decl *D = SkipBody.CheckSameAsPrevious ? SkipBody.New : TagOrTempResult.get(); // Parse the definition body. ParseStructUnionBody(StartLoc, TagType, cast(D)); if (SkipBody.CheckSameAsPrevious && !Actions.ActOnDuplicateDefinition(DS, TagOrTempResult.get(), SkipBody)) { DS.SetTypeSpecError(); return; } } } if (!TagOrTempResult.isInvalid()) // Delayed processing of attributes. Actions.ProcessDeclAttributeDelayed(TagOrTempResult.get(), attrs); const char *PrevSpec = nullptr; unsigned DiagID; bool Result; if (!TypeResult.isInvalid()) { Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, NameLoc.isValid() ? NameLoc : StartLoc, PrevSpec, DiagID, TypeResult.get(), Policy); } else if (!TagOrTempResult.isInvalid()) { Result = DS.SetTypeSpecType(TagType, StartLoc, NameLoc.isValid() ? NameLoc : StartLoc, PrevSpec, DiagID, TagOrTempResult.get(), Owned, Policy); } 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. // // After a type-specifier, we don't expect a semicolon. This only happens in // C, since definitions are not permitted in this context in C++. if (TUK == Sema::TUK_Definition && (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) && (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) { if (Tok.isNot(tok::semi)) { const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy(); ExpectAndConsume(tok::semi, diag::err_expected_after, DeclSpec::getSpecifierName(TagType, PPol)); // 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, /*IsReinject=*/true); 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 (!TryConsumeToken(tok::comma)) break; } // Attach the base specifiers Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo); } /// 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 BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { bool IsVirtual = false; SourceLocation StartLoc = Tok.getLocation(); ParsedAttributesWithRange Attributes(AttrFactory); MaybeParseCXX11Attributes(Attributes); // Parse the 'virtual' keyword. if (TryConsumeToken(tok::kw_virtual)) 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. // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL // implementation for VS2013 uses _Atomic as an identifier for one of the // classes in . Treat '_Atomic' to be an identifier when we are // parsing the class-name for a base specifier. if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) && NextToken().is(tok::less)) Tok.setKind(tok::identifier); 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; TryConsumeToken(tok::ellipsis, EllipsisLoc); // 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; } } /// If the given declarator has any parts for which parsing has to be /// delayed, e.g., default arguments or an exception-specification, 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) { DeclaratorChunk::FunctionTypeInfo &FTI = DeclaratorInfo.getFunctionTypeInfo(); // If there was a late-parsed exception-specification, we'll need a // late parse bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed; if (!NeedLateParse) { // Look ahead to see if there are any default args for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) { auto Param = cast(FTI.Params[ParamIdx].Param); if (Param->hasUnparsedDefaultArg()) { NeedLateParse = true; break; } } } if (NeedLateParse) { // Push this method onto the stack of late-parsed method // declarations. auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); getCurrentClass().LateParsedDeclarations.push_back(LateMethod); // Push tokens for each parameter. Those that do not have defaults will be // NULL. We need to track all the parameters so that we can push them into // scope for later parameters and perhaps for the exception specification. LateMethod->DefaultArgs.reserve(FTI.NumParams); for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument( FTI.Params[ParamIdx].Param, std::move(FTI.Params[ParamIdx].DefaultArgTokens))); // Stash the exception-specification tokens in the late-pased method. if (FTI.getExceptionSpecType() == EST_Unparsed) { LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens; FTI.ExceptionSpecTokens = nullptr; } } } /// isCXX11VirtSpecifier - Determine whether the given token is a C++11 /// virt-specifier. /// /// virt-specifier: /// override /// final /// __final VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const { if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier)) return VirtSpecifiers::VS_None; IdentifierInfo *II = Tok.getIdentifierInfo(); // Initialize the contextual keywords. if (!Ident_final) { Ident_final = &PP.getIdentifierTable().get("final"); if (getLangOpts().GNUKeywords) Ident_GNU_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; if (II == Ident_GNU_final) return VirtSpecifiers::VS_GNU_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, SourceLocation FriendLoc) { while (true) { VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(); if (Specifier == VirtSpecifiers::VS_None) return; if (FriendLoc.isValid()) { Diag(Tok.getLocation(), diag::err_friend_decl_spec) << VirtSpecifiers::getSpecifierName(Specifier) << FixItHint::CreateRemoval(Tok.getLocation()) << SourceRange(FriendLoc, FriendLoc); ConsumeToken(); continue; } // C++ [class.mem]p8: // A virt-specifier-seq shall contain at most one of each virt-specifier. const char *PrevSpec = nullptr; 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 if (Specifier == VirtSpecifiers::VS_GNU_Final) { Diag(Tok.getLocation(), diag::ext_warn_gnu_final); } 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 /// 'final' or Microsoft 'sealed' contextual keyword. bool Parser::isCXX11FinalKeyword() const { VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(); return Specifier == VirtSpecifiers::VS_Final || Specifier == VirtSpecifiers::VS_GNU_Final || Specifier == VirtSpecifiers::VS_Sealed; } /// Parse a C++ member-declarator up to, but not including, the optional /// brace-or-equal-initializer or pure-specifier. bool Parser::ParseCXXMemberDeclaratorBeforeInitializer( Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize, LateParsedAttrList &LateParsedAttrs) { // member-declarator: // declarator virt-specifier-seq[opt] pure-specifier[opt] // declarator requires-clause // declarator brace-or-equal-initializer[opt] // identifier attribute-specifier-seq[opt] ':' constant-expression // brace-or-equal-initializer[opt] // ':' constant-expression // // NOTE: the latter two productions are a proposed bugfix rather than the // current grammar rules as of C++20. if (Tok.isNot(tok::colon)) ParseDeclarator(DeclaratorInfo); else DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation()); if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) { assert(DeclaratorInfo.isPastIdentifier() && "don't know where identifier would go yet?"); BitfieldSize = ParseConstantExpression(); if (BitfieldSize.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); } else if (Tok.is(tok::kw_requires)) { ParseTrailingRequiresClause(DeclaratorInfo); } else { ParseOptionalCXX11VirtSpecifierSeq( VS, getCurrentClass().IsInterface, DeclaratorInfo.getDeclSpec().getFriendSpecLoc()); if (!VS.isUnset()) MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS); } // If a simple-asm-expr is present, parse it. if (Tok.is(tok::kw_asm)) { SourceLocation Loc; ExprResult AsmLabel(ParseSimpleAsm(/*ForAsmLabel*/ true, &Loc)); if (AsmLabel.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); DeclaratorInfo.setAsmLabel(AsmLabel.get()); DeclaratorInfo.SetRangeEnd(Loc); } // If attributes exist after the declarator, but before an '{', parse them. // However, this does not apply for [[]] attributes (which could show up // before or after the __attribute__ attributes). DiagnoseAndSkipCXX11Attributes(); MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); DiagnoseAndSkipCXX11Attributes(); // For compatibility with code written to older Clang, also accept a // virt-specifier *after* the GNU attributes. if (BitfieldSize.isUnset() && VS.isUnset()) { ParseOptionalCXX11VirtSpecifierSeq( VS, getCurrentClass().IsInterface, DeclaratorInfo.getDeclSpec().getFriendSpecLoc()); if (!VS.isUnset()) { // If we saw any GNU-style attributes that are known to GCC followed by a // virt-specifier, issue a GCC-compat warning. for (const ParsedAttr &AL : DeclaratorInfo.getAttributes()) if (AL.isKnownToGCC() && !AL.isCXX11Attribute()) Diag(AL.getLoc(), diag::warn_gcc_attribute_location); MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS); } } // If this has neither a name nor a bit width, something has gone seriously // wrong. Skip until the semi-colon or }. if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) { // If so, skip until the semi-colon or a }. SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); return true; } return false; } /// Look for declaration specifiers possibly occurring after C++11 /// virt-specifier-seq and diagnose them. void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq( Declarator &D, VirtSpecifiers &VS) { DeclSpec DS(AttrFactory); // GNU-style and C++11 attributes are not allowed here, but they will be // handled by the caller. Diagnose everything else. ParseTypeQualifierListOpt( DS, AR_NoAttributesParsed, false, /*IdentifierRequired=*/false, llvm::function_ref([&]() { Actions.CodeCompleteFunctionQualifiers(DS, D, &VS); })); D.ExtendWithDeclSpec(DS); if (D.isFunctionDeclarator()) { auto &Function = D.getFunctionTypeInfo(); if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) { auto DeclSpecCheck = [&](DeclSpec::TQ TypeQual, StringRef FixItName, SourceLocation SpecLoc) { FixItHint Insertion; auto &MQ = Function.getOrCreateMethodQualifiers(); if (!(MQ.getTypeQualifiers() & TypeQual)) { std::string Name(FixItName.data()); Name += " "; Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name); MQ.SetTypeQual(TypeQual, SpecLoc); } Diag(SpecLoc, diag::err_declspec_after_virtspec) << FixItName << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier()) << FixItHint::CreateRemoval(SpecLoc) << Insertion; }; DS.forEachQualifier(DeclSpecCheck); } // Parse ref-qualifiers. bool RefQualifierIsLValueRef = true; SourceLocation RefQualifierLoc; if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) { const char *Name = (RefQualifierIsLValueRef ? "& " : "&& "); FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name); Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef; Function.RefQualifierLoc = RefQualifierLoc; Diag(RefQualifierLoc, diag::err_declspec_after_virtspec) << (RefQualifierIsLValueRef ? "&" : "&&") << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier()) << FixItHint::CreateRemoval(RefQualifierLoc) << Insertion; D.SetRangeEnd(RefQualifierLoc); } } } /// 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] /// [C++2a] declarator requires-clause /// 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 /// Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, ParsedAttributes &AccessAttrs, const ParsedTemplateInfo &TemplateInfo, ParsingDeclRAIIObject *TemplateDiags) { if (Tok.is(tok::at)) { if (getLangOpts().ObjC && 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 nullptr; } // Turn on colon protection early, while parsing declspec, although there is // nothing to protect there. It prevents from false errors if error recovery // incorrectly determines where the declspec ends, as in the example: // struct A { enum class B { C }; }; // const int C = 4; // struct D { A::B : C; }; ColonProtectionRAIIObject X(*this); // Access declarations. bool MalformedTypeSpec = false; if (!TemplateInfo.Kind && Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) { 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, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false); if (SS.isInvalid()) { SkipUntil(tok::semi); return nullptr; } // Try to parse an unqualified-id. SourceLocation TemplateKWLoc; UnqualifiedId Name; if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, false, true, true, false, &TemplateKWLoc, Name)) { SkipUntil(tok::semi); return nullptr; } // TODO: recover from mistakenly-qualified operator declarations. if (ExpectAndConsume(tok::semi, diag::err_expected_after, "access declaration")) { SkipUntil(tok::semi); return nullptr; } // FIXME: We should do something with the 'template' keyword here. return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration( getCurScope(), AS, /*UsingLoc*/ SourceLocation(), /*TypenameLoc*/ SourceLocation(), SS, Name, /*EllipsisLoc*/ SourceLocation(), /*AttrList*/ ParsedAttributesView()))); } } // static_assert-declaration. A templated static_assert declaration is // diagnosed in Parser::ParseSingleDeclarationAfterTemplate. if (!TemplateInfo.Kind && Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) { SourceLocation DeclEnd; return DeclGroupPtrTy::make( DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd))); } if (Tok.is(tok::kw_template)) { assert(!TemplateInfo.TemplateParams && "Nested template improperly parsed?"); ObjCDeclContextSwitch ObjCDC(*this); SourceLocation DeclEnd; return DeclGroupPtrTy::make( DeclGroupRef(ParseTemplateDeclarationOrSpecialization( DeclaratorContext::Member, DeclEnd, AccessAttrs, AS))); } // 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); } ParsedAttributesWithRange attrs(AttrFactory); ParsedAttributesViewWithRange FnAttrs; // 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.begin(), attrs.end()); FnAttrs.Range = attrs.Range; MaybeParseMicrosoftAttributes(attrs); if (Tok.is(tok::kw_using)) { ProhibitAttributes(attrs); // Eat 'using'. SourceLocation UsingLoc = ConsumeToken(); // Consume unexpected 'template' keywords. while (Tok.is(tok::kw_template)) { SourceLocation TemplateLoc = ConsumeToken(); Diag(TemplateLoc, diag::err_unexpected_template_after_using) << FixItHint::CreateRemoval(TemplateLoc); } if (Tok.is(tok::kw_namespace)) { Diag(UsingLoc, diag::err_using_namespace_in_class); SkipUntil(tok::semi, StopBeforeMatch); return nullptr; } SourceLocation DeclEnd; // Otherwise, it must be a using-declaration or an alias-declaration. return ParseUsingDeclaration(DeclaratorContext::Member, TemplateInfo, UsingLoc, DeclEnd, AS); } // 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, DeclSpecContext::DSC_class, &CommonLateParsedAttrs); // Turn off colon protection that was set for declspec. X.restore(); // 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, DeclSpecContext::DSC_class, &CommonLateParsedAttrs)) return nullptr; MultiTemplateParamsArg TemplateParams( TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : nullptr, TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); if (TryConsumeToken(tok::semi)) { if (DS.isFriendSpecified()) ProhibitAttributes(FnAttrs); RecordDecl *AnonRecord = nullptr; Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec( getCurScope(), AS, DS, TemplateParams, false, AnonRecord); DS.complete(TheDecl); if (AnonRecord) { Decl* decls[] = {AnonRecord, TheDecl}; return Actions.BuildDeclaratorGroup(decls); } return Actions.ConvertDeclToDeclGroup(TheDecl); } ParsingDeclarator DeclaratorInfo(*this, DS, DeclaratorContext::Member); if (TemplateInfo.TemplateParams) DeclaratorInfo.setTemplateParameterLists(TemplateParams); VirtSpecifiers VS; // Hold late-parsed attributes so we can attach a Decl to them later. LateParsedAttrList LateParsedAttrs; SourceLocation EqualLoc; SourceLocation PureSpecLoc; auto TryConsumePureSpecifier = [&] (bool AllowDefinition) { if (Tok.isNot(tok::equal)) return false; auto &Zero = NextToken(); SmallString<8> Buffer; if (Zero.isNot(tok::numeric_constant) || PP.getSpelling(Zero, Buffer) != "0") return false; auto &After = GetLookAheadToken(2); if (!After.isOneOf(tok::semi, tok::comma) && !(AllowDefinition && After.isOneOf(tok::l_brace, tok::colon, tok::kw_try))) return false; EqualLoc = ConsumeToken(); PureSpecLoc = ConsumeToken(); return true; }; SmallVector DeclsInGroup; ExprResult BitfieldSize; ExprResult TrailingRequiresClause; bool ExpectSemi = true; // Parse the first declarator. if (ParseCXXMemberDeclaratorBeforeInitializer( DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) { TryConsumeToken(tok::semi); return nullptr; } // Check for a member function definition. if (BitfieldSize.isUnset()) { // MSVC permits pure specifier on inline functions defined at class scope. // Hence check for =0 before checking for function definition. if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction()) TryConsumePureSpecifier(/*AllowDefinition*/ true); FunctionDefinitionKind DefinitionKind = FunctionDefinitionKind::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 = FunctionDefinitionKind::Definition; } else if (DeclaratorInfo.isFunctionDeclarator()) { if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) { DefinitionKind = FunctionDefinitionKind::Definition; } else if (Tok.is(tok::equal)) { const Token &KW = NextToken(); if (KW.is(tok::kw_default)) DefinitionKind = FunctionDefinitionKind::Defaulted; else if (KW.is(tok::kw_delete)) DefinitionKind = FunctionDefinitionKind::Deleted; else if (KW.is(tok::code_completion)) { Actions.CodeCompleteAfterFunctionEquals(DeclaratorInfo); cutOffParsing(); return nullptr; } } } DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind); // 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 == FunctionDefinitionKind::Declaration && DS.isFriendSpecified()) { // Diagnose attributes that appear before decl specifier: // [[]] friend int foo(); ProhibitAttributes(FnAttrs); } if (DefinitionKind != FunctionDefinitionKind::Declaration) { if (!DeclaratorInfo.isFunctionDeclarator()) { Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params); ConsumeBrace(); SkipUntil(tok::r_brace); // Consume the optional ';' TryConsumeToken(tok::semi); return nullptr; } 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, PureSpecLoc); 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 DeclGroupPtrTy::make(DeclGroupRef(FunDecl)); } } // member-declarator-list: // member-declarator // member-declarator-list ',' member-declarator while (1) { InClassInitStyle HasInClassInit = ICIS_NoInit; bool HasStaticInitializer = false; if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) { // DRXXXX: Anonymous bit-fields cannot have a brace-or-equal-initializer. if (BitfieldSize.isUsable() && !DeclaratorInfo.hasName()) { // Diagnose the error and pretend there is no in-class initializer. Diag(Tok, diag::err_anon_bitfield_member_init); SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); } else if (DeclaratorInfo.isDeclarationOfFunction()) { // It's a pure-specifier. if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false)) // Parse it as an expression so that Sema can diagnose it. HasStaticInitializer = true; } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && DeclaratorInfo.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && !DS.isFriendSpecified()) { // It's a default member initializer. if (BitfieldSize.get()) Diag(Tok, getLangOpts().CPlusPlus20 ? diag::warn_cxx17_compat_bitfield_member_init : diag::ext_bitfield_member_init); HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit; } else { HasStaticInitializer = true; } } // 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 = nullptr; 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 that appear in a friend member function declarator: // friend int foo [[]] (); SmallVector Ranges; DeclaratorInfo.getCXX11AttributeRanges(Ranges); for (SmallVectorImpl::iterator I = Ranges.begin(), E = Ranges.end(); I != E; ++I) Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I; ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, TemplateParams); } else { ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, DeclaratorInfo, TemplateParams, BitfieldSize.get(), VS, HasInClassInit); if (VarTemplateDecl *VT = ThisDecl ? dyn_cast(ThisDecl) : nullptr) // Re-direct this decl to refer to the templated decl so that we can // initialize it. ThisDecl = VT->getTemplatedDecl(); if (ThisDecl) Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs); } // Error recovery might have converted a non-static member into a static // member. if (HasInClassInit != ICIS_NoInit && DeclaratorInfo.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) { HasInClassInit = ICIS_NoInit; HasStaticInitializer = true; } if (ThisDecl && PureSpecLoc.isValid()) Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc); // Handle the initializer. if (HasInClassInit != ICIS_NoInit) { // 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 (HasStaticInitializer) { // Normal initializer. ExprResult Init = ParseCXXMemberInitializer( ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); if (Init.isInvalid()) SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch); else if (ThisDecl) Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid()); } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) // No initializer. Actions.ActOnUninitializedDecl(ThisDecl); 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. SourceLocation CommaLoc; if (!TryConsumeToken(tok::comma, CommaLoc)) break; if (Tok.isAtStartOfLine() && !MightBeDeclarator(DeclaratorContext::Member)) { // 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 = ExprResult(/*Invalid=*/false); EqualLoc = PureSpecLoc = SourceLocation(); DeclaratorInfo.setCommaLoc(CommaLoc); // GNU attributes are allowed before the second and subsequent declarator. // However, this does not apply for [[]] attributes (which could show up // before or after the __attribute__ attributes). DiagnoseAndSkipCXX11Attributes(); MaybeParseGNUAttributes(DeclaratorInfo); DiagnoseAndSkipCXX11Attributes(); if (ParseCXXMemberDeclaratorBeforeInitializer( DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) break; } 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. TryConsumeToken(tok::semi); return nullptr; } return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup); } /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer. /// Also detect and reject any attempted defaulted/deleted function definition. /// The location of the '=', if any, will be placed in EqualLoc. /// /// This does not check for a pure-specifier; that's handled elsewhere. /// /// 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.isOneOf(tok::equal, tok::l_brace) && "Data member initializer not starting with '=' or '{'"); EnterExpressionEvaluationContext Context( Actions, Sema::ExpressionEvaluationContext::PotentiallyEvaluated, D); if (TryConsumeToken(tok::equal, EqualLoc)) { 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.isOneOf(tok::semi, tok::comma, tok::eof)) { if (IsFunction) Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) << 1 /* delete */; else Diag(ConsumeToken(), diag::err_deleted_non_function); return ExprError(); } } 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) << getLangOpts().CPlusPlus20; return ExprError(); } } if (const auto *PD = dyn_cast_or_null(D)) { Diag(Tok, diag::err_ms_property_initializer) << PD; return ExprError(); } return ParseInitializer(); } void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc, SourceLocation AttrFixitLoc, unsigned TagType, Decl *TagDecl) { // Skip the optional 'final' keyword. if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) { assert(isCXX11FinalKeyword() && "not a class definition"); ConsumeToken(); // Diagnose any C++11 attributes after 'final' keyword. // We deliberately discard these attributes. ParsedAttributesWithRange Attrs(AttrFactory); CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc); // This can only happen if we had malformed misplaced attributes; // we only get called if there is a colon or left-brace after the // attributes. if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace)) return; } // Skip the base clauses. This requires actually parsing them, because // otherwise we can't be sure where they end (a left brace may appear // within a template argument). if (Tok.is(tok::colon)) { // Enter the scope of the class so that we can correctly parse its bases. ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true, TagType == DeclSpec::TST_interface); auto OldContext = Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl); // Parse the bases but don't attach them to the class. ParseBaseClause(nullptr); Actions.ActOnTagFinishSkippedDefinition(OldContext); if (!Tok.is(tok::l_brace)) { Diag(PP.getLocForEndOfToken(PrevTokLocation), diag::err_expected_lbrace_after_base_specifiers); return; } } // Skip the body. assert(Tok.is(tok::l_brace)); BalancedDelimiterTracker T(*this, tok::l_brace); T.consumeOpen(); T.skipToEnd(); // Parse and discard any trailing attributes. ParsedAttributes Attrs(AttrFactory); if (Tok.is(tok::kw___attribute)) MaybeParseGNUAttributes(Attrs); } Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas( AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs, DeclSpec::TST TagType, Decl *TagDecl) { ParenBraceBracketBalancer BalancerRAIIObj(*this); switch (Tok.getKind()) { case tok::kw___if_exists: case tok::kw___if_not_exists: ParseMicrosoftIfExistsClassDeclaration(TagType, AccessAttrs, AS); return nullptr; case tok::semi: // Check for extraneous top-level semicolon. ConsumeExtraSemi(InsideStruct, TagType); return nullptr; // Handle pragmas that can appear as member declarations. case tok::annot_pragma_vis: HandlePragmaVisibility(); return nullptr; case tok::annot_pragma_pack: HandlePragmaPack(); return nullptr; case tok::annot_pragma_align: HandlePragmaAlign(); return nullptr; case tok::annot_pragma_ms_pointers_to_members: HandlePragmaMSPointersToMembers(); return nullptr; case tok::annot_pragma_ms_pragma: HandlePragmaMSPragma(); return nullptr; case tok::annot_pragma_ms_vtordisp: HandlePragmaMSVtorDisp(); return nullptr; case tok::annot_pragma_dump: HandlePragmaDump(); return nullptr; case tok::kw_namespace: // If we see a namespace here, a close brace was missing somewhere. DiagnoseUnexpectedNamespace(cast(TagDecl)); return nullptr; case tok::kw_private: // FIXME: We don't accept GNU attributes on access specifiers in OpenCL mode // yet. if (getLangOpts().OpenCL && !NextToken().is(tok::colon)) return ParseCXXClassMemberDeclaration(AS, AccessAttrs); LLVM_FALLTHROUGH; case tok::kw_public: case tok::kw_protected: { AccessSpecifier NewAS = getAccessSpecifierIfPresent(); assert(NewAS != AS_none); // Current token is a C++ access specifier. AS = NewAS; SourceLocation ASLoc = Tok.getLocation(); unsigned TokLength = Tok.getLength(); ConsumeToken(); AccessAttrs.clear(); MaybeParseGNUAttributes(AccessAttrs); SourceLocation EndLoc; if (TryConsumeToken(tok::colon, EndLoc)) { } else if (TryConsumeToken(tok::semi, EndLoc)) { Diag(EndLoc, diag::err_expected) << tok::colon << FixItHint::CreateReplacement(EndLoc, ":"); } else { EndLoc = ASLoc.getLocWithOffset(TokLength); Diag(EndLoc, diag::err_expected) << tok::colon << FixItHint::CreateInsertion(EndLoc, ":"); } // The Microsoft extension __interface does not permit non-public // access specifiers. if (TagType == DeclSpec::TST_interface && AS != AS_public) { Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected); } if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc, AccessAttrs)) { // found another attribute than only annotations AccessAttrs.clear(); } return nullptr; } case tok::annot_pragma_openmp: return ParseOpenMPDeclarativeDirectiveWithExtDecl( AS, AccessAttrs, /*Delayed=*/true, TagType, TagDecl); default: if (tok::isPragmaAnnotation(Tok.getKind())) { Diag(Tok.getLocation(), diag::err_pragma_misplaced_in_decl) << DeclSpec::getSpecifierName(TagType, Actions.getASTContext().getPrintingPolicy()); ConsumeAnnotationToken(); return nullptr; } return ParseCXXClassMemberDeclaration(AS, AccessAttrs); } } /// 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!"); llvm::TimeTraceScope TimeScope("ParseClass", [&]() { if (auto *TD = dyn_cast_or_null(TagDecl)) return TD->getQualifiedNameAsString(); return std::string(""); }); PrettyDeclStackTraceEntry CrashInfo(Actions.Context, 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() : "(anonymous)"); } break; } if ((S->getFlags() & Scope::FnScope)) // If we're in a function or function template then this is a local // class rather than a nested class. 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_GNU_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); else if (Specifier == VirtSpecifiers::VS_GNU_Final) Diag(FinalLoc, diag::ext_warn_gnu_final); // 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); // ParseClassSpecifier() does only a superficial check for attributes before // deciding to call this method. For example, for // `class C final alignas ([l) {` it will decide that this looks like a // misplaced attribute since it sees `alignas '(' ')'`. But the actual // attribute parsing code will try to parse the '[' as a constexpr lambda // and consume enough tokens that the alignas parsing code will eat the // opening '{'. So bail out if the next token isn't one we expect. if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) { if (TagDecl) Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); return; } } if (Tok.is(tok::colon)) { ParseScope InheritanceScope(this, getCurScope()->getFlags() | Scope::ClassInheritanceScope); ParseBaseClause(TagDecl); if (!Tok.is(tok::l_brace)) { bool SuggestFixIt = false; SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation); if (Tok.isAtStartOfLine()) { switch (Tok.getKind()) { case tok::kw_private: case tok::kw_protected: case tok::kw_public: SuggestFixIt = NextToken().getKind() == tok::colon; break; case tok::kw_static_assert: case tok::r_brace: case tok::kw_using: // base-clause can have simple-template-id; 'template' can't be there case tok::kw_template: SuggestFixIt = true; break; case tok::identifier: SuggestFixIt = isConstructorDeclarator(true); break; default: SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false); break; } } DiagnosticBuilder LBraceDiag = Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers); if (SuggestFixIt) { LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {"); // Try recovering from missing { after base-clause. PP.EnterToken(Tok, /*IsReinject*/true); Tok.setKind(tok::l_brace); } else { 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; ParsedAttributesWithRange AccessAttrs(AttrFactory); if (TagDecl) { // While we still have something to read, read the member-declarations. while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { // Each iteration of this loop reads one member-declaration. ParseCXXClassMemberDeclarationWithPragmas( CurAS, AccessAttrs, static_cast(TagType), TagDecl); MaybeDestroyTemplateIds(); } 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); // C++11 [class.mem]p2: // Within the class member-specification, the class is regarded as complete // within function bodies, default arguments, exception-specifications, 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. // Save the state of Sema.FPFeatures, and change the setting // to the levels specified on the command line. Previous level // will be restored when the RAII object is destroyed. Sema::FPFeaturesStateRAII SaveFPFeaturesState(Actions); FPOptionsOverride NewOverrides; Actions.CurFPFeatures = NewOverrides.applyOverrides(getLangOpts()); Actions.FpPragmaStack.Act(Tok.getLocation(), Sema::PSK_Reset, StringRef(), {} /*unused*/); SourceLocation SavedPrevTokLocation = PrevTokLocation; ParseLexedPragmas(getCurrentClass()); ParseLexedAttributes(getCurrentClass()); ParseLexedMethodDeclarations(getCurrentClass()); // We've finished with all pending member declarations. Actions.ActOnFinishCXXMemberDecls(); ParseLexedMemberInitializers(getCurrentClass()); ParseLexedMethodDefs(getCurrentClass()); PrevTokLocation = SavedPrevTokLocation; // We've finished parsing everything, including default argument // initializers. Actions.ActOnFinishCXXNonNestedClass(); } if (TagDecl) Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange()); // 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, /*IsReinject*/ true); Tok.startToken(); Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation)); Tok.setKind(tok::semi); PP.EnterToken(Tok, /*IsReinject*/ true); 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(); } 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 previous initializer was valid and the next token looks like a // base or member initializer, assume that we're just missing a comma. else if (!MemInit.isInvalid() && Tok.isOneOf(tok::identifier, 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 '{'. if (!MemInit.isInvalid()) Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace << tok::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 MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { // parse '::'[opt] nested-name-specifier[opt] CXXScopeSpec SS; if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr, /*ObjectHadErrors=*/false, /*EnteringContext=*/false)) return true; // : identifier IdentifierInfo *II = nullptr; SourceLocation IdLoc = Tok.getLocation(); // : declype(...) DeclSpec DS(AttrFactory); // : template_name<...> TypeResult TemplateTypeTy; 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(); } else if (Tok.is(tok::annot_decltype)) { // Get the decltype expression, if there is one. // Uses of decltype will already have been converted to annot_decltype by // ParseOptionalCXXScopeSpecifier at this point. // FIXME: Can we get here with a scope specifier? ParseDecltypeSpecifier(DS); } else { TemplateIdAnnotation *TemplateId = Tok.is(tok::annot_template_id) ? takeTemplateIdAnnotation(Tok) : nullptr; if (TemplateId && TemplateId->mightBeType()) { AnnotateTemplateIdTokenAsType(SS, /*IsClassName*/true); assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); TemplateTypeTy = getTypeAnnotation(Tok); ConsumeAnnotationToken(); } else { Diag(Tok, diag::err_expected_member_or_base_name); return true; } } // Parse the '('. if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); // FIXME: Add support for signature help inside initializer lists. ExprResult InitList = ParseBraceInitializer(); if (InitList.isInvalid()) return true; SourceLocation EllipsisLoc; TryConsumeToken(tok::ellipsis, EllipsisLoc); if (TemplateTypeTy.isInvalid()) return true; return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, TemplateTypeTy.get(), DS, IdLoc, InitList.get(), 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; auto RunSignatureHelp = [&] { if (TemplateTypeTy.isInvalid()) return QualType(); QualType PreferredType = Actions.ProduceCtorInitMemberSignatureHelp( getCurScope(), ConstructorDecl, SS, TemplateTypeTy.get(), ArgExprs, II, T.getOpenLocation()); CalledSignatureHelp = true; return PreferredType; }; if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs, [&] { PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp); })) { if (PP.isCodeCompletionReached() && !CalledSignatureHelp) RunSignatureHelp(); SkipUntil(tok::r_paren, StopAtSemi); return true; } T.consumeClose(); SourceLocation EllipsisLoc; TryConsumeToken(tok::ellipsis, EllipsisLoc); if (TemplateTypeTy.isInvalid()) return true; return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, TemplateTypeTy.get(), DS, IdLoc, T.getOpenLocation(), ArgExprs, T.getCloseLocation(), EllipsisLoc); } if (TemplateTypeTy.isInvalid()) return true; if (getLangOpts().CPlusPlus11) return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace; else return Diag(Tok, diag::err_expected) << tok::l_paren; } /// 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(bool Delayed, SourceRange &SpecificationRange, SmallVectorImpl &DynamicExceptions, SmallVectorImpl &DynamicExceptionRanges, ExprResult &NoexceptExpr, CachedTokens *&ExceptionSpecTokens) { ExceptionSpecificationType Result = EST_None; ExceptionSpecTokens = nullptr; // Handle delayed parsing of exception-specifications. if (Delayed) { if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept)) return EST_None; // Consume and cache the starting token. bool IsNoexcept = Tok.is(tok::kw_noexcept); Token StartTok = Tok; SpecificationRange = SourceRange(ConsumeToken()); // Check for a '('. if (!Tok.is(tok::l_paren)) { // If this is a bare 'noexcept', we're done. if (IsNoexcept) { Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); NoexceptExpr = nullptr; return EST_BasicNoexcept; } Diag(Tok, diag::err_expected_lparen_after) << "throw"; return EST_DynamicNone; } // Cache the tokens for the exception-specification. ExceptionSpecTokens = new CachedTokens; ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept' ExceptionSpecTokens->push_back(Tok); // '(' SpecificationRange.setEnd(ConsumeParen()); // '(' ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens, /*StopAtSemi=*/true, /*ConsumeFinalToken=*/true); SpecificationRange.setEnd(ExceptionSpecTokens->back().getLocation()); return EST_Unparsed; } // 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(); NoexceptExpr = ParseConstantExpression(); T.consumeClose(); if (!NoexceptExpr.isInvalid()) { NoexceptExpr = Actions.ActOnNoexceptSpec(KeywordLoc, NoexceptExpr.get(), NoexceptType); NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); } else { NoexceptType = EST_BasicNoexcept; } } 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, SourceRange Range, bool IsNoexcept) { if (P.getLangOpts().CPlusPlus11) { const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)"; P.Diag(Range.getBegin(), P.getLangOpts().CPlusPlus17 && !IsNoexcept ? diag::ext_dynamic_exception_spec : 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 (!TryConsumeToken(tok::comma)) 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, bool MayBeFollowedByDirectInit) { assert(Tok.is(tok::arrow) && "expected arrow"); ConsumeToken(); return ParseTypeName(&Range, MayBeFollowedByDirectInit ? DeclaratorContext::TrailingReturnVar : DeclaratorContext::TrailingReturn); } /// Parse a requires-clause as part of a function declaration. void Parser::ParseTrailingRequiresClause(Declarator &D) { assert(Tok.is(tok::kw_requires) && "expected requires"); SourceLocation RequiresKWLoc = ConsumeToken(); ExprResult TrailingRequiresClause; ParseScope ParamScope(this, Scope::DeclScope | Scope::FunctionDeclarationScope | Scope::FunctionPrototypeScope); Actions.ActOnStartTrailingRequiresClause(getCurScope(), D); llvm::Optional ThisScope; InitCXXThisScopeForDeclaratorIfRelevant(D, D.getDeclSpec(), ThisScope); TrailingRequiresClause = ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true); TrailingRequiresClause = Actions.ActOnFinishTrailingRequiresClause(TrailingRequiresClause); if (!D.isDeclarationOfFunction()) { Diag(RequiresKWLoc, diag::err_requires_clause_on_declarator_not_declaring_a_function); return; } if (TrailingRequiresClause.isInvalid()) SkipUntil({tok::l_brace, tok::arrow, tok::kw_try, tok::comma, tok::colon}, StopAtSemi | StopBeforeMatch); else D.setTrailingRequiresClause(TrailingRequiresClause.get()); // Did the user swap the trailing return type and requires clause? if (D.isFunctionDeclarator() && Tok.is(tok::arrow) && D.getDeclSpec().getTypeSpecType() == TST_auto) { SourceLocation ArrowLoc = Tok.getLocation(); SourceRange Range; TypeResult TrailingReturnType = ParseTrailingReturnType(Range, /*MayBeFollowedByDirectInit=*/false); if (!TrailingReturnType.isInvalid()) { Diag(ArrowLoc, diag::err_requires_clause_must_appear_after_trailing_return) << Range; auto &FunctionChunk = D.getFunctionTypeInfo(); FunctionChunk.HasTrailingReturnType = TrailingReturnType.isUsable(); FunctionChunk.TrailingReturnType = TrailingReturnType.get(); FunctionChunk.TrailingReturnTypeLoc = Range.getBegin(); } else SkipUntil({tok::equal, tok::l_brace, tok::arrow, tok::kw_try, tok::comma}, StopAtSemi | StopBeforeMatch); } } /// 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(); } /// 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; } /// 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)); } /// 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 (!Tok.isAnnotation()) { if (IdentifierInfo *II = Tok.getIdentifierInfo()) { Loc = ConsumeToken(); return II; } } return nullptr; case tok::numeric_constant: { // If we got a numeric constant, check to see if it comes from a macro that // corresponds to the predefined __clang__ macro. If it does, warn the user // and recover by pretending they said _Clang instead. if (Tok.getLocation().isMacroID()) { SmallString<8> ExpansionBuf; SourceLocation ExpansionLoc = PP.getSourceManager().getExpansionLoc(Tok.getLocation()); StringRef Spelling = PP.getSpelling(ExpansionLoc, ExpansionBuf); if (Spelling == "__clang__") { SourceRange TokRange( ExpansionLoc, PP.getSourceManager().getExpansionLoc(Tok.getEndLoc())); Diag(Tok, diag::warn_wrong_clang_attr_namespace) << FixItHint::CreateReplacement(TokRange, "_Clang"); Loc = ConsumeToken(); return &PP.getIdentifierTable().get("_Clang"); } } return nullptr; } 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; SourceLocation SpellingLoc = PP.getSourceManager().getSpellingLoc(Tok.getLocation()); StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf); if (isLetter(Spelling[0])) { Loc = ConsumeToken(); return &PP.getIdentifierTable().get(Spelling); } return nullptr; } } static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName, IdentifierInfo *ScopeName) { switch ( ParsedAttr::getParsedKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) { case ParsedAttr::AT_CarriesDependency: case ParsedAttr::AT_Deprecated: case ParsedAttr::AT_FallThrough: case ParsedAttr::AT_CXX11NoReturn: case ParsedAttr::AT_NoUniqueAddress: case ParsedAttr::AT_Likely: case ParsedAttr::AT_Unlikely: return true; case ParsedAttr::AT_WarnUnusedResult: return !ScopeName && AttrName->getName().equals("nodiscard"); case ParsedAttr::AT_Unused: return !ScopeName && AttrName->getName().equals("maybe_unused"); default: return false; } } /// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause. /// /// [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 '}' bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName, SourceLocation AttrNameLoc, ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName, SourceLocation ScopeLoc) { assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list"); SourceLocation LParenLoc = Tok.getLocation(); const LangOptions &LO = getLangOpts(); ParsedAttr::Syntax Syntax = LO.CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x; // If the attribute isn't known, we will not attempt to parse any // arguments. if (!hasAttribute(LO.CPlusPlus ? AttrSyntax::CXX : AttrSyntax::C, ScopeName, AttrName, getTargetInfo(), getLangOpts())) { // Eat the left paren, then skip to the ending right paren. ConsumeParen(); SkipUntil(tok::r_paren); return false; } if (ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"))) { // GNU-scoped attributes have some special cases to handle GNU-specific // behaviors. ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, ScopeLoc, Syntax, nullptr); return true; } unsigned NumArgs; // Some Clang-scoped attributes have some special parsing behavior. if (ScopeName && (ScopeName->isStr("clang") || ScopeName->isStr("_Clang"))) NumArgs = ParseClangAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, ScopeLoc, Syntax); else NumArgs = ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, ScopeLoc, Syntax); if (!Attrs.empty() && IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) { ParsedAttr &Attr = Attrs.back(); // If the attribute is a standard or built-in attribute and we are // parsing an argument list, we need to determine whether this attribute // was allowed to have an argument list (such as [[deprecated]]), and how // many arguments were parsed (so we can diagnose on [[deprecated()]]). if (Attr.getMaxArgs() && !NumArgs) { // The attribute was allowed to have arguments, but none were provided // even though the attribute parsed successfully. This is an error. Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName; Attr.setInvalid(true); } else if (!Attr.getMaxArgs()) { // The attribute parsed successfully, but was not allowed to have any // arguments. It doesn't matter whether any were provided -- the // presence of the argument list (even if empty) is diagnosed. Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments) << AttrName << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc)); Attr.setInvalid(true); } } return true; } /// ParseCXX11AttributeSpecifier - Parse a C++11 or C2x attribute-specifier. /// /// [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 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 double square bracket attribute list"); SourceLocation OpenLoc = Tok.getLocation(); Diag(OpenLoc, diag::warn_cxx98_compat_attribute); ConsumeBracket(); checkCompoundToken(OpenLoc, tok::l_square, CompoundToken::AttrBegin); ConsumeBracket(); SourceLocation CommonScopeLoc; IdentifierInfo *CommonScopeName = nullptr; if (Tok.is(tok::kw_using)) { Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_using_attribute_ns : diag::ext_using_attribute_ns); ConsumeToken(); CommonScopeName = TryParseCXX11AttributeIdentifier(CommonScopeLoc); if (!CommonScopeName) { Diag(Tok.getLocation(), diag::err_expected) << tok::identifier; SkipUntil(tok::r_square, tok::colon, StopBeforeMatch); } if (!TryConsumeToken(tok::colon) && CommonScopeName) Diag(Tok.getLocation(), diag::err_expected) << tok::colon; } llvm::SmallDenseMap SeenAttrs; while (Tok.isNot(tok::r_square)) { // attribute not present if (TryConsumeToken(tok::comma)) continue; SourceLocation ScopeLoc, AttrLoc; IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr; AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); if (!AttrName) // Break out to the "expected ']'" diagnostic. break; // scoped attribute if (TryConsumeToken(tok::coloncolon)) { ScopeName = AttrName; ScopeLoc = AttrLoc; AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); if (!AttrName) { Diag(Tok.getLocation(), diag::err_expected) << tok::identifier; SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch); continue; } } if (CommonScopeName) { if (ScopeName) { Diag(ScopeLoc, diag::err_using_attribute_ns_conflict) << SourceRange(CommonScopeLoc); } else { ScopeName = CommonScopeName; ScopeLoc = CommonScopeLoc; } } 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)) AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, attrs, endLoc, ScopeName, ScopeLoc); if (!AttrParsed) attrs.addNew( AttrName, SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, AttrLoc), ScopeName, ScopeLoc, nullptr, 0, getLangOpts().CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x); if (TryConsumeToken(tok::ellipsis)) Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis) << AttrName; } SourceLocation CloseLoc = Tok.getLocation(); if (ExpectAndConsume(tok::r_square)) SkipUntil(tok::r_square); else if (Tok.is(tok::r_square)) checkCompoundToken(CloseLoc, tok::r_square, CompoundToken::AttrEnd); if (endLoc) *endLoc = Tok.getLocation(); if (ExpectAndConsume(tok::r_square)) SkipUntil(tok::r_square); } /// ParseCXX11Attributes - Parse a C++11 or C2x attribute-specifier-seq. /// /// attribute-specifier-seq: /// attribute-specifier-seq[opt] attribute-specifier void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs, SourceLocation *endLoc) { assert(standardAttributesAllowed()); SourceLocation StartLoc = Tok.getLocation(), Loc; if (!endLoc) endLoc = &Loc; do { ParseCXX11AttributeSpecifier(attrs, endLoc); } while (isCXX11AttributeSpecifier()); attrs.Range = SourceRange(StartLoc, *endLoc); } void Parser::DiagnoseAndSkipCXX11Attributes() { // Start and end location of an attribute or an attribute list. SourceLocation StartLoc = Tok.getLocation(); SourceLocation EndLoc = SkipCXX11Attributes(); if (EndLoc.isValid()) { SourceRange Range(StartLoc, EndLoc); Diag(StartLoc, diag::err_attributes_not_allowed) << Range; } } SourceLocation Parser::SkipCXX11Attributes() { SourceLocation EndLoc; if (!isCXX11AttributeSpecifier()) return 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()); return EndLoc; } /// Parse uuid() attribute when it appears in a [] Microsoft attribute. void Parser::ParseMicrosoftUuidAttributeArgs(ParsedAttributes &Attrs) { assert(Tok.is(tok::identifier) && "Not a Microsoft attribute list"); IdentifierInfo *UuidIdent = Tok.getIdentifierInfo(); assert(UuidIdent->getName() == "uuid" && "Not a Microsoft attribute list"); SourceLocation UuidLoc = Tok.getLocation(); ConsumeToken(); // Ignore the left paren location for now. BalancedDelimiterTracker T(*this, tok::l_paren); if (T.consumeOpen()) { Diag(Tok, diag::err_expected) << tok::l_paren; return; } ArgsVector ArgExprs; if (Tok.is(tok::string_literal)) { // Easy case: uuid("...") -- quoted string. ExprResult StringResult = ParseStringLiteralExpression(); if (StringResult.isInvalid()) return; ArgExprs.push_back(StringResult.get()); } else { // something like uuid({000000A0-0000-0000-C000-000000000049}) -- no // quotes in the parens. Just append the spelling of all tokens encountered // until the closing paren. SmallString<42> StrBuffer; // 2 "", 36 bytes UUID, 2 optional {}, 1 nul StrBuffer += "\""; // Since none of C++'s keywords match [a-f]+, accepting just tok::l_brace, // tok::r_brace, tok::minus, tok::identifier (think C000) and // tok::numeric_constant (0000) should be enough. But the spelling of the // uuid argument is checked later anyways, so there's no harm in accepting // almost anything here. // cl is very strict about whitespace in this form and errors out if any // is present, so check the space flags on the tokens. SourceLocation StartLoc = Tok.getLocation(); while (Tok.isNot(tok::r_paren)) { if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) { Diag(Tok, diag::err_attribute_uuid_malformed_guid); SkipUntil(tok::r_paren, StopAtSemi); return; } SmallString<16> SpellingBuffer; SpellingBuffer.resize(Tok.getLength() + 1); bool Invalid = false; StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid); if (Invalid) { SkipUntil(tok::r_paren, StopAtSemi); return; } StrBuffer += TokSpelling; ConsumeAnyToken(); } StrBuffer += "\""; if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) { Diag(Tok, diag::err_attribute_uuid_malformed_guid); ConsumeParen(); return; } // Pretend the user wrote the appropriate string literal here. // ActOnStringLiteral() copies the string data into the literal, so it's // ok that the Token points to StrBuffer. Token Toks[1]; Toks[0].startToken(); Toks[0].setKind(tok::string_literal); Toks[0].setLocation(StartLoc); Toks[0].setLiteralData(StrBuffer.data()); Toks[0].setLength(StrBuffer.size()); StringLiteral *UuidString = cast(Actions.ActOnStringLiteral(Toks, nullptr).get()); ArgExprs.push_back(UuidString); } if (!T.consumeClose()) { Attrs.addNew(UuidIdent, SourceRange(UuidLoc, T.getCloseLocation()), nullptr, SourceLocation(), ArgExprs.data(), ArgExprs.size(), ParsedAttr::AS_Microsoft); } } /// ParseMicrosoftAttributes - Parse Microsoft attributes [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"); do { // FIXME: If this is actually a C++11 attribute, parse it as one. BalancedDelimiterTracker T(*this, tok::l_square); T.consumeOpen(); // Skip most ms attributes except for a specific list. while (true) { SkipUntil(tok::r_square, tok::identifier, StopAtSemi | StopBeforeMatch); if (Tok.isNot(tok::identifier)) // ']', but also eof break; if (Tok.getIdentifierInfo()->getName() == "uuid") ParseMicrosoftUuidAttributeArgs(attrs); else ConsumeToken(); } T.consumeClose(); if (endLoc) *endLoc = T.getCloseLocation(); } while (Tok.is(tok::l_square)); } void Parser::ParseMicrosoftIfExistsClassDeclaration( DeclSpec::TST TagType, ParsedAttributes &AccessAttrs, AccessSpecifier &CurAS) { IfExistsCondition Result; if (ParseMicrosoftIfExistsCondition(Result)) return; BalancedDelimiterTracker Braces(*this, tok::l_brace); if (Braces.consumeOpen()) { Diag(Tok, diag::err_expected) << tok::l_brace; 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. LLVM_FALLTHROUGH; case IEB_Skip: Braces.skipToEnd(); return; } while (Tok.isNot(tok::r_brace) && !isEofOrEom()) { // __if_exists, __if_not_exists can nest. if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) { ParseMicrosoftIfExistsClassDeclaration(TagType, AccessAttrs, 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(), ParsedAttributesView{}); else Diag(Tok, diag::err_expected) << tok::colon; ConsumeToken(); continue; } // Parse all the comma separated declarators. ParseCXXClassMemberDeclaration(CurAS, AccessAttrs); } Braces.consumeClose(); }