1 //===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the C++ Declaration portions of the Parser interfaces.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Parse/Parser.h"
15 #include "RAIIObjectsForParser.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/Basic/Attributes.h"
19 #include "clang/Basic/CharInfo.h"
20 #include "clang/Basic/OperatorKinds.h"
21 #include "clang/Basic/TargetInfo.h"
22 #include "clang/Parse/ParseDiagnostic.h"
23 #include "clang/Sema/DeclSpec.h"
24 #include "clang/Sema/ParsedTemplate.h"
25 #include "clang/Sema/PrettyDeclStackTrace.h"
26 #include "clang/Sema/Scope.h"
27 #include "clang/Sema/SemaDiagnostic.h"
28 #include "llvm/ADT/SmallString.h"
30 using namespace clang;
32 /// ParseNamespace - We know that the current token is a namespace keyword. This
33 /// may either be a top level namespace or a block-level namespace alias. If
34 /// there was an inline keyword, it has already been parsed.
36 /// namespace-definition: [C++ 7.3: basic.namespace]
37 /// named-namespace-definition
38 /// unnamed-namespace-definition
40 /// unnamed-namespace-definition:
41 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
43 /// named-namespace-definition:
44 /// original-namespace-definition
45 /// extension-namespace-definition
47 /// original-namespace-definition:
48 /// 'inline'[opt] 'namespace' identifier attributes[opt]
49 /// '{' namespace-body '}'
51 /// extension-namespace-definition:
52 /// 'inline'[opt] 'namespace' original-namespace-name
53 /// '{' namespace-body '}'
55 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
56 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
58 Parser::DeclGroupPtrTy Parser::ParseNamespace(unsigned Context,
59 SourceLocation &DeclEnd,
60 SourceLocation InlineLoc) {
61 assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
62 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
63 ObjCDeclContextSwitch ObjCDC(*this);
65 if (Tok.is(tok::code_completion)) {
66 Actions.CodeCompleteNamespaceDecl(getCurScope());
71 SourceLocation IdentLoc;
72 IdentifierInfo *Ident = nullptr;
73 std::vector<SourceLocation> ExtraIdentLoc;
74 std::vector<IdentifierInfo*> ExtraIdent;
75 std::vector<SourceLocation> ExtraNamespaceLoc;
77 ParsedAttributesWithRange attrs(AttrFactory);
78 SourceLocation attrLoc;
79 if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) {
80 if (!getLangOpts().CPlusPlus1z)
81 Diag(Tok.getLocation(), diag::warn_cxx14_compat_attribute)
83 attrLoc = Tok.getLocation();
84 ParseCXX11Attributes(attrs);
87 if (Tok.is(tok::identifier)) {
88 Ident = Tok.getIdentifierInfo();
89 IdentLoc = ConsumeToken(); // eat the identifier.
90 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
91 ExtraNamespaceLoc.push_back(ConsumeToken());
92 ExtraIdent.push_back(Tok.getIdentifierInfo());
93 ExtraIdentLoc.push_back(ConsumeToken());
97 // A nested namespace definition cannot have attributes.
98 if (!ExtraNamespaceLoc.empty() && attrLoc.isValid())
99 Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute);
101 // Read label attributes, if present.
102 if (Tok.is(tok::kw___attribute)) {
103 attrLoc = Tok.getLocation();
104 ParseGNUAttributes(attrs);
107 if (Tok.is(tok::equal)) {
109 Diag(Tok, diag::err_expected) << tok::identifier;
110 // Skip to end of the definition and eat the ';'.
111 SkipUntil(tok::semi);
114 if (attrLoc.isValid())
115 Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias);
116 if (InlineLoc.isValid())
117 Diag(InlineLoc, diag::err_inline_namespace_alias)
118 << FixItHint::CreateRemoval(InlineLoc);
119 Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
120 return Actions.ConvertDeclToDeclGroup(NSAlias);
123 BalancedDelimiterTracker T(*this, tok::l_brace);
124 if (T.consumeOpen()) {
126 Diag(Tok, diag::err_expected) << tok::l_brace;
128 Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
132 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
133 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
134 getCurScope()->getFnParent()) {
135 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
136 SkipUntil(tok::r_brace);
140 if (ExtraIdent.empty()) {
141 // Normal namespace definition, not a nested-namespace-definition.
142 } else if (InlineLoc.isValid()) {
143 Diag(InlineLoc, diag::err_inline_nested_namespace_definition);
144 } else if (getLangOpts().CPlusPlus1z) {
145 Diag(ExtraNamespaceLoc[0],
146 diag::warn_cxx14_compat_nested_namespace_definition);
148 TentativeParsingAction TPA(*this);
149 SkipUntil(tok::r_brace, StopBeforeMatch);
150 Token rBraceToken = Tok;
153 if (!rBraceToken.is(tok::r_brace)) {
154 Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
155 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
157 std::string NamespaceFix;
158 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
159 E = ExtraIdent.end(); I != E; ++I) {
160 NamespaceFix += " { namespace ";
161 NamespaceFix += (*I)->getName();
165 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
168 Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
169 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
170 ExtraIdentLoc.back()),
172 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
176 // If we're still good, complain about inline namespaces in non-C++0x now.
177 if (InlineLoc.isValid())
178 Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
179 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
181 // Enter a scope for the namespace.
182 ParseScope NamespaceScope(this, Scope::DeclScope);
184 UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
186 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
187 IdentLoc, Ident, T.getOpenLocation(),
188 attrs.getList(), ImplicitUsingDirectiveDecl);
190 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
191 "parsing namespace");
193 // Parse the contents of the namespace. This includes parsing recovery on
194 // any improperly nested namespaces.
195 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
196 InlineLoc, attrs, T);
198 // Leave the namespace scope.
199 NamespaceScope.Exit();
201 DeclEnd = T.getCloseLocation();
202 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
204 return Actions.ConvertDeclToDeclGroup(NamespcDecl,
205 ImplicitUsingDirectiveDecl);
208 /// ParseInnerNamespace - Parse the contents of a namespace.
209 void Parser::ParseInnerNamespace(std::vector<SourceLocation> &IdentLoc,
210 std::vector<IdentifierInfo *> &Ident,
211 std::vector<SourceLocation> &NamespaceLoc,
212 unsigned int index, SourceLocation &InlineLoc,
213 ParsedAttributes &attrs,
214 BalancedDelimiterTracker &Tracker) {
215 if (index == Ident.size()) {
216 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
217 Tok.isNot(tok::eof)) {
218 ParsedAttributesWithRange attrs(AttrFactory);
219 MaybeParseCXX11Attributes(attrs);
220 ParseExternalDeclaration(attrs);
223 // The caller is what called check -- we are simply calling
225 Tracker.consumeClose();
230 // Handle a nested namespace definition.
231 // FIXME: Preserve the source information through to the AST rather than
232 // desugaring it here.
233 ParseScope NamespaceScope(this, Scope::DeclScope);
234 UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
236 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
237 NamespaceLoc[index], IdentLoc[index],
238 Ident[index], Tracker.getOpenLocation(),
239 attrs.getList(), ImplicitUsingDirectiveDecl);
240 assert(!ImplicitUsingDirectiveDecl &&
241 "nested namespace definition cannot define anonymous namespace");
243 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
246 NamespaceScope.Exit();
247 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
250 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
251 /// alias definition.
253 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
254 SourceLocation AliasLoc,
255 IdentifierInfo *Alias,
256 SourceLocation &DeclEnd) {
257 assert(Tok.is(tok::equal) && "Not equal token");
259 ConsumeToken(); // eat the '='.
261 if (Tok.is(tok::code_completion)) {
262 Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
268 // Parse (optional) nested-name-specifier.
269 ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false);
271 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
272 Diag(Tok, diag::err_expected_namespace_name);
273 // Skip to end of the definition and eat the ';'.
274 SkipUntil(tok::semi);
279 IdentifierInfo *Ident = Tok.getIdentifierInfo();
280 SourceLocation IdentLoc = ConsumeToken();
283 DeclEnd = Tok.getLocation();
284 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name))
285 SkipUntil(tok::semi);
287 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc,
288 Alias, SS, IdentLoc, Ident);
291 /// ParseLinkage - We know that the current token is a string_literal
292 /// and just before that, that extern was seen.
294 /// linkage-specification: [C++ 7.5p2: dcl.link]
295 /// 'extern' string-literal '{' declaration-seq[opt] '}'
296 /// 'extern' string-literal declaration
298 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
299 assert(isTokenStringLiteral() && "Not a string literal!");
300 ExprResult Lang = ParseStringLiteralExpression(false);
302 ParseScope LinkageScope(this, Scope::DeclScope);
306 : Actions.ActOnStartLinkageSpecification(
307 getCurScope(), DS.getSourceRange().getBegin(), Lang.get(),
308 Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
310 ParsedAttributesWithRange attrs(AttrFactory);
311 MaybeParseCXX11Attributes(attrs);
313 if (Tok.isNot(tok::l_brace)) {
314 // Reset the source range in DS, as the leading "extern"
315 // does not really belong to the inner declaration ...
316 DS.SetRangeStart(SourceLocation());
317 DS.SetRangeEnd(SourceLocation());
318 // ... but anyway remember that such an "extern" was seen.
319 DS.setExternInLinkageSpec(true);
320 ParseExternalDeclaration(attrs, &DS);
321 return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
322 getCurScope(), LinkageSpec, SourceLocation())
328 ProhibitAttributes(attrs);
330 BalancedDelimiterTracker T(*this, tok::l_brace);
333 unsigned NestedModules = 0;
335 switch (Tok.getKind()) {
336 case tok::annot_module_begin:
341 case tok::annot_module_end:
348 case tok::annot_module_include:
360 ParsedAttributesWithRange attrs(AttrFactory);
361 MaybeParseCXX11Attributes(attrs);
362 ParseExternalDeclaration(attrs);
370 return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
371 getCurScope(), LinkageSpec, T.getCloseLocation())
375 /// Parse a C++ Modules TS export-declaration.
377 /// export-declaration:
378 /// 'export' declaration
379 /// 'export' '{' declaration-seq[opt] '}'
381 Decl *Parser::ParseExportDeclaration() {
382 assert(Tok.is(tok::kw_export));
383 SourceLocation ExportLoc = ConsumeToken();
385 ParseScope ExportScope(this, Scope::DeclScope);
386 Decl *ExportDecl = Actions.ActOnStartExportDecl(
387 getCurScope(), ExportLoc,
388 Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
390 if (Tok.isNot(tok::l_brace)) {
391 // FIXME: Factor out a ParseExternalDeclarationWithAttrs.
392 ParsedAttributesWithRange Attrs(AttrFactory);
393 MaybeParseCXX11Attributes(Attrs);
394 MaybeParseMicrosoftAttributes(Attrs);
395 ParseExternalDeclaration(Attrs);
396 return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
400 BalancedDelimiterTracker T(*this, tok::l_brace);
403 // The Modules TS draft says "An export-declaration shall declare at least one
404 // entity", but the intent is that it shall contain at least one declaration.
405 if (Tok.is(tok::r_brace))
406 Diag(ExportLoc, diag::err_export_empty)
407 << SourceRange(ExportLoc, Tok.getLocation());
409 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
410 Tok.isNot(tok::eof)) {
411 ParsedAttributesWithRange Attrs(AttrFactory);
412 MaybeParseCXX11Attributes(Attrs);
413 MaybeParseMicrosoftAttributes(Attrs);
414 ParseExternalDeclaration(Attrs);
418 return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
419 T.getCloseLocation());
422 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
423 /// using-directive. Assumes that current token is 'using'.
424 Parser::DeclGroupPtrTy
425 Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
426 const ParsedTemplateInfo &TemplateInfo,
427 SourceLocation &DeclEnd,
428 ParsedAttributesWithRange &attrs) {
429 assert(Tok.is(tok::kw_using) && "Not using token");
430 ObjCDeclContextSwitch ObjCDC(*this);
433 SourceLocation UsingLoc = ConsumeToken();
435 if (Tok.is(tok::code_completion)) {
436 Actions.CodeCompleteUsing(getCurScope());
441 // 'using namespace' means this is a using-directive.
442 if (Tok.is(tok::kw_namespace)) {
443 // Template parameters are always an error here.
444 if (TemplateInfo.Kind) {
445 SourceRange R = TemplateInfo.getSourceRange();
446 Diag(UsingLoc, diag::err_templated_using_directive_declaration)
447 << 0 /* directive */ << R << FixItHint::CreateRemoval(R);
450 Decl *UsingDir = ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
451 return Actions.ConvertDeclToDeclGroup(UsingDir);
454 // Otherwise, it must be a using-declaration or an alias-declaration.
456 // Using declarations can't have attributes.
457 ProhibitAttributes(attrs);
459 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
463 /// ParseUsingDirective - Parse C++ using-directive, assumes
464 /// that current token is 'namespace' and 'using' was already parsed.
466 /// using-directive: [C++ 7.3.p4: namespace.udir]
467 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
469 /// [GNU] using-directive:
470 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
471 /// namespace-name attributes[opt] ;
473 Decl *Parser::ParseUsingDirective(unsigned Context,
474 SourceLocation UsingLoc,
475 SourceLocation &DeclEnd,
476 ParsedAttributes &attrs) {
477 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
480 SourceLocation NamespcLoc = ConsumeToken();
482 if (Tok.is(tok::code_completion)) {
483 Actions.CodeCompleteUsingDirective(getCurScope());
489 // Parse (optional) nested-name-specifier.
490 ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false);
492 IdentifierInfo *NamespcName = nullptr;
493 SourceLocation IdentLoc = SourceLocation();
495 // Parse namespace-name.
496 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
497 Diag(Tok, diag::err_expected_namespace_name);
498 // If there was invalid namespace name, skip to end of decl, and eat ';'.
499 SkipUntil(tok::semi);
500 // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
505 NamespcName = Tok.getIdentifierInfo();
506 IdentLoc = ConsumeToken();
508 // Parse (optional) attributes (most likely GNU strong-using extension).
509 bool GNUAttr = false;
510 if (Tok.is(tok::kw___attribute)) {
512 ParseGNUAttributes(attrs);
516 DeclEnd = Tok.getLocation();
517 if (ExpectAndConsume(tok::semi,
518 GNUAttr ? diag::err_expected_semi_after_attribute_list
519 : diag::err_expected_semi_after_namespace_name))
520 SkipUntil(tok::semi);
522 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
523 IdentLoc, NamespcName, attrs.getList());
526 /// Parse a using-declarator (or the identifier in a C++11 alias-declaration).
528 /// using-declarator:
529 /// 'typename'[opt] nested-name-specifier unqualified-id
531 bool Parser::ParseUsingDeclarator(unsigned Context, UsingDeclarator &D) {
534 // Ignore optional 'typename'.
535 // FIXME: This is wrong; we should parse this as a typename-specifier.
536 TryConsumeToken(tok::kw_typename, D.TypenameLoc);
538 if (Tok.is(tok::kw___super)) {
539 Diag(Tok.getLocation(), diag::err_super_in_using_declaration);
543 // Parse nested-name-specifier.
544 IdentifierInfo *LastII = nullptr;
545 ParseOptionalCXXScopeSpecifier(D.SS, nullptr, /*EnteringContext=*/false,
546 /*MayBePseudoDtor=*/nullptr,
547 /*IsTypename=*/false,
549 if (D.SS.isInvalid())
552 // Parse the unqualified-id. We allow parsing of both constructor and
553 // destructor names and allow the action module to diagnose any semantic
556 // C++11 [class.qual]p2:
557 // [...] in a using-declaration that is a member-declaration, if the name
558 // specified after the nested-name-specifier is the same as the identifier
559 // or the simple-template-id's template-name in the last component of the
560 // nested-name-specifier, the name is [...] considered to name the
562 if (getLangOpts().CPlusPlus11 && Context == Declarator::MemberContext &&
563 Tok.is(tok::identifier) &&
564 (NextToken().is(tok::semi) || NextToken().is(tok::comma) ||
565 NextToken().is(tok::ellipsis)) &&
566 D.SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
567 !D.SS.getScopeRep()->getAsNamespace() &&
568 !D.SS.getScopeRep()->getAsNamespaceAlias()) {
569 SourceLocation IdLoc = ConsumeToken();
571 Actions.getInheritingConstructorName(D.SS, IdLoc, *LastII);
572 D.Name.setConstructorName(Type, IdLoc, IdLoc);
574 if (ParseUnqualifiedId(
575 D.SS, /*EnteringContext=*/false,
576 /*AllowDestructorName=*/true,
577 /*AllowConstructorName=*/!(Tok.is(tok::identifier) &&
578 NextToken().is(tok::equal)),
579 nullptr, D.TemplateKWLoc, D.Name))
583 if (TryConsumeToken(tok::ellipsis, D.EllipsisLoc))
584 Diag(Tok.getLocation(), getLangOpts().CPlusPlus1z ?
585 diag::warn_cxx1z_compat_using_declaration_pack :
586 diag::ext_using_declaration_pack);
591 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
592 /// Assumes that 'using' was already seen.
594 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
595 /// 'using' using-declarator-list[opt] ;
597 /// using-declarator-list: [C++1z]
598 /// using-declarator '...'[opt]
599 /// using-declarator-list ',' using-declarator '...'[opt]
601 /// using-declarator-list: [C++98-14]
604 /// alias-declaration: C++11 [dcl.dcl]p1
605 /// 'using' identifier attribute-specifier-seq[opt] = type-id ;
607 Parser::DeclGroupPtrTy
608 Parser::ParseUsingDeclaration(unsigned Context,
609 const ParsedTemplateInfo &TemplateInfo,
610 SourceLocation UsingLoc, SourceLocation &DeclEnd,
611 AccessSpecifier AS) {
612 // Check for misplaced attributes before the identifier in an
613 // alias-declaration.
614 ParsedAttributesWithRange MisplacedAttrs(AttrFactory);
615 MaybeParseCXX11Attributes(MisplacedAttrs);
618 bool InvalidDeclarator = ParseUsingDeclarator(Context, D);
620 ParsedAttributesWithRange Attrs(AttrFactory);
621 MaybeParseGNUAttributes(Attrs);
622 MaybeParseCXX11Attributes(Attrs);
624 // Maybe this is an alias-declaration.
625 if (Tok.is(tok::equal)) {
626 if (InvalidDeclarator) {
627 SkipUntil(tok::semi);
631 // If we had any misplaced attributes from earlier, this is where they
632 // should have been written.
633 if (MisplacedAttrs.Range.isValid()) {
634 Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed)
635 << FixItHint::CreateInsertionFromRange(
637 CharSourceRange::getTokenRange(MisplacedAttrs.Range))
638 << FixItHint::CreateRemoval(MisplacedAttrs.Range);
639 Attrs.takeAllFrom(MisplacedAttrs);
642 Decl *DeclFromDeclSpec = nullptr;
643 Decl *AD = ParseAliasDeclarationAfterDeclarator(
644 TemplateInfo, UsingLoc, D, DeclEnd, AS, Attrs, &DeclFromDeclSpec);
645 return Actions.ConvertDeclToDeclGroup(AD, DeclFromDeclSpec);
648 // C++11 attributes are not allowed on a using-declaration, but GNU ones
650 ProhibitAttributes(MisplacedAttrs);
651 ProhibitAttributes(Attrs);
653 // Diagnose an attempt to declare a templated using-declaration.
654 // In C++11, alias-declarations can be templates:
655 // template <...> using id = type;
656 if (TemplateInfo.Kind) {
657 SourceRange R = TemplateInfo.getSourceRange();
658 Diag(UsingLoc, diag::err_templated_using_directive_declaration)
659 << 1 /* declaration */ << R << FixItHint::CreateRemoval(R);
661 // Unfortunately, we have to bail out instead of recovering by
662 // ignoring the parameters, just in case the nested name specifier
663 // depends on the parameters.
667 SmallVector<Decl *, 8> DeclsInGroup;
669 // Parse (optional) attributes (most likely GNU strong-using extension).
670 MaybeParseGNUAttributes(Attrs);
672 if (InvalidDeclarator)
673 SkipUntil(tok::comma, tok::semi, StopBeforeMatch);
675 // "typename" keyword is allowed for identifiers only,
676 // because it may be a type definition.
677 if (D.TypenameLoc.isValid() &&
678 D.Name.getKind() != UnqualifiedId::IK_Identifier) {
679 Diag(D.Name.getSourceRange().getBegin(),
680 diag::err_typename_identifiers_only)
681 << FixItHint::CreateRemoval(SourceRange(D.TypenameLoc));
682 // Proceed parsing, but discard the typename keyword.
683 D.TypenameLoc = SourceLocation();
686 Decl *UD = Actions.ActOnUsingDeclaration(getCurScope(), AS, UsingLoc,
687 D.TypenameLoc, D.SS, D.Name,
688 D.EllipsisLoc, Attrs.getList());
690 DeclsInGroup.push_back(UD);
693 if (!TryConsumeToken(tok::comma))
696 // Parse another using-declarator.
698 InvalidDeclarator = ParseUsingDeclarator(Context, D);
701 if (DeclsInGroup.size() > 1)
702 Diag(Tok.getLocation(), getLangOpts().CPlusPlus1z ?
703 diag::warn_cxx1z_compat_multi_using_declaration :
704 diag::ext_multi_using_declaration);
707 DeclEnd = Tok.getLocation();
708 if (ExpectAndConsume(tok::semi, diag::err_expected_after,
709 !Attrs.empty() ? "attributes list"
710 : "using declaration"))
711 SkipUntil(tok::semi);
713 return Actions.BuildDeclaratorGroup(DeclsInGroup);
716 Decl *Parser::ParseAliasDeclarationAfterDeclarator(
717 const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc,
718 UsingDeclarator &D, SourceLocation &DeclEnd, AccessSpecifier AS,
719 ParsedAttributes &Attrs, Decl **OwnedType) {
720 if (ExpectAndConsume(tok::equal)) {
721 SkipUntil(tok::semi);
725 Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
726 diag::warn_cxx98_compat_alias_declaration :
727 diag::ext_alias_declaration);
729 // Type alias templates cannot be specialized.
731 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
732 D.Name.getKind() == UnqualifiedId::IK_TemplateId)
734 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
736 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
738 if (SpecKind != -1) {
741 Range = SourceRange(D.Name.TemplateId->LAngleLoc,
742 D.Name.TemplateId->RAngleLoc);
744 Range = TemplateInfo.getSourceRange();
745 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
746 << SpecKind << Range;
747 SkipUntil(tok::semi);
751 // Name must be an identifier.
752 if (D.Name.getKind() != UnqualifiedId::IK_Identifier) {
753 Diag(D.Name.StartLocation, diag::err_alias_declaration_not_identifier);
754 // No removal fixit: can't recover from this.
755 SkipUntil(tok::semi);
757 } else if (D.TypenameLoc.isValid())
758 Diag(D.TypenameLoc, diag::err_alias_declaration_not_identifier)
759 << FixItHint::CreateRemoval(SourceRange(
761 D.SS.isNotEmpty() ? D.SS.getEndLoc() : D.TypenameLoc));
762 else if (D.SS.isNotEmpty())
763 Diag(D.SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
764 << FixItHint::CreateRemoval(D.SS.getRange());
765 if (D.EllipsisLoc.isValid())
766 Diag(D.EllipsisLoc, diag::err_alias_declaration_pack_expansion)
767 << FixItHint::CreateRemoval(SourceRange(D.EllipsisLoc));
769 Decl *DeclFromDeclSpec = nullptr;
770 TypeResult TypeAlias =
771 ParseTypeName(nullptr,
772 TemplateInfo.Kind ? Declarator::AliasTemplateContext
773 : Declarator::AliasDeclContext,
774 AS, &DeclFromDeclSpec, &Attrs);
776 *OwnedType = DeclFromDeclSpec;
779 DeclEnd = Tok.getLocation();
780 if (ExpectAndConsume(tok::semi, diag::err_expected_after,
781 !Attrs.empty() ? "attributes list"
782 : "alias declaration"))
783 SkipUntil(tok::semi);
785 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
786 MultiTemplateParamsArg TemplateParamsArg(
787 TemplateParams ? TemplateParams->data() : nullptr,
788 TemplateParams ? TemplateParams->size() : 0);
789 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
790 UsingLoc, D.Name, Attrs.getList(),
791 TypeAlias, DeclFromDeclSpec);
794 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
796 /// [C++0x] static_assert-declaration:
797 /// static_assert ( constant-expression , string-literal ) ;
799 /// [C11] static_assert-declaration:
800 /// _Static_assert ( constant-expression , string-literal ) ;
802 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
803 assert(Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) &&
804 "Not a static_assert declaration");
806 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
807 Diag(Tok, diag::ext_c11_static_assert);
808 if (Tok.is(tok::kw_static_assert))
809 Diag(Tok, diag::warn_cxx98_compat_static_assert);
811 SourceLocation StaticAssertLoc = ConsumeToken();
813 BalancedDelimiterTracker T(*this, tok::l_paren);
814 if (T.consumeOpen()) {
815 Diag(Tok, diag::err_expected) << tok::l_paren;
820 ExprResult AssertExpr(ParseConstantExpression());
821 if (AssertExpr.isInvalid()) {
826 ExprResult AssertMessage;
827 if (Tok.is(tok::r_paren)) {
828 Diag(Tok, getLangOpts().CPlusPlus1z
829 ? diag::warn_cxx14_compat_static_assert_no_message
830 : diag::ext_static_assert_no_message)
831 << (getLangOpts().CPlusPlus1z
833 : FixItHint::CreateInsertion(Tok.getLocation(), ", \"\""));
835 if (ExpectAndConsume(tok::comma)) {
836 SkipUntil(tok::semi);
840 if (!isTokenStringLiteral()) {
841 Diag(Tok, diag::err_expected_string_literal)
842 << /*Source='static_assert'*/1;
847 AssertMessage = ParseStringLiteralExpression();
848 if (AssertMessage.isInvalid()) {
856 DeclEnd = Tok.getLocation();
857 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
859 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
862 T.getCloseLocation());
865 /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
867 /// 'decltype' ( expression )
868 /// 'decltype' ( 'auto' ) [C++1y]
870 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
871 assert(Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)
872 && "Not a decltype specifier");
875 SourceLocation StartLoc = Tok.getLocation();
876 SourceLocation EndLoc;
878 if (Tok.is(tok::annot_decltype)) {
879 Result = getExprAnnotation(Tok);
880 EndLoc = Tok.getAnnotationEndLoc();
882 if (Result.isInvalid()) {
883 DS.SetTypeSpecError();
887 if (Tok.getIdentifierInfo()->isStr("decltype"))
888 Diag(Tok, diag::warn_cxx98_compat_decltype);
892 BalancedDelimiterTracker T(*this, tok::l_paren);
893 if (T.expectAndConsume(diag::err_expected_lparen_after,
894 "decltype", tok::r_paren)) {
895 DS.SetTypeSpecError();
896 return T.getOpenLocation() == Tok.getLocation() ?
897 StartLoc : T.getOpenLocation();
900 // Check for C++1y 'decltype(auto)'.
901 if (Tok.is(tok::kw_auto)) {
902 // No need to disambiguate here: an expression can't start with 'auto',
903 // because the typename-specifier in a function-style cast operation can't
905 Diag(Tok.getLocation(),
906 getLangOpts().CPlusPlus14
907 ? diag::warn_cxx11_compat_decltype_auto_type_specifier
908 : diag::ext_decltype_auto_type_specifier);
911 // Parse the expression
913 // C++11 [dcl.type.simple]p4:
914 // The operand of the decltype specifier is an unevaluated operand.
915 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
916 nullptr,/*IsDecltype=*/true);
918 Actions.CorrectDelayedTyposInExpr(ParseExpression(), [](Expr *E) {
919 return E->hasPlaceholderType() ? ExprError() : E;
921 if (Result.isInvalid()) {
922 DS.SetTypeSpecError();
923 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
924 EndLoc = ConsumeParen();
926 if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
927 // Backtrack to get the location of the last token before the semi.
928 PP.RevertCachedTokens(2);
929 ConsumeToken(); // the semi.
930 EndLoc = ConsumeAnyToken();
931 assert(Tok.is(tok::semi));
933 EndLoc = Tok.getLocation();
939 Result = Actions.ActOnDecltypeExpression(Result.get());
944 if (T.getCloseLocation().isInvalid()) {
945 DS.SetTypeSpecError();
946 // FIXME: this should return the location of the last token
947 // that was consumed (by "consumeClose()")
948 return T.getCloseLocation();
951 if (Result.isInvalid()) {
952 DS.SetTypeSpecError();
953 return T.getCloseLocation();
956 EndLoc = T.getCloseLocation();
958 assert(!Result.isInvalid());
960 const char *PrevSpec = nullptr;
962 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
963 // Check for duplicate type specifiers (e.g. "int decltype(a)").
965 ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
966 DiagID, Result.get(), Policy)
967 : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
969 Diag(StartLoc, DiagID) << PrevSpec;
970 DS.SetTypeSpecError();
975 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
976 SourceLocation StartLoc,
977 SourceLocation EndLoc) {
978 // make sure we have a token we can turn into an annotation token
979 if (PP.isBacktrackEnabled())
980 PP.RevertCachedTokens(1);
984 Tok.setKind(tok::annot_decltype);
985 setExprAnnotation(Tok,
986 DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() :
987 DS.getTypeSpecType() == TST_decltype_auto ? ExprResult() :
989 Tok.setAnnotationEndLoc(EndLoc);
990 Tok.setLocation(StartLoc);
991 PP.AnnotateCachedTokens(Tok);
994 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
995 assert(Tok.is(tok::kw___underlying_type) &&
996 "Not an underlying type specifier");
998 SourceLocation StartLoc = ConsumeToken();
999 BalancedDelimiterTracker T(*this, tok::l_paren);
1000 if (T.expectAndConsume(diag::err_expected_lparen_after,
1001 "__underlying_type", tok::r_paren)) {
1005 TypeResult Result = ParseTypeName();
1006 if (Result.isInvalid()) {
1007 SkipUntil(tok::r_paren, StopAtSemi);
1013 if (T.getCloseLocation().isInvalid())
1016 const char *PrevSpec = nullptr;
1018 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
1019 DiagID, Result.get(),
1020 Actions.getASTContext().getPrintingPolicy()))
1021 Diag(StartLoc, DiagID) << PrevSpec;
1022 DS.setTypeofParensRange(T.getRange());
1025 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
1026 /// class name or decltype-specifier. Note that we only check that the result
1027 /// names a type; semantic analysis will need to verify that the type names a
1028 /// class. The result is either a type or null, depending on whether a type
1031 /// base-type-specifier: [C++11 class.derived]
1032 /// class-or-decltype
1033 /// class-or-decltype: [C++11 class.derived]
1034 /// nested-name-specifier[opt] class-name
1035 /// decltype-specifier
1036 /// class-name: [C++ class.name]
1038 /// simple-template-id
1040 /// In C++98, instead of base-type-specifier, we have:
1042 /// ::[opt] nested-name-specifier[opt] class-name
1043 TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
1044 SourceLocation &EndLocation) {
1045 // Ignore attempts to use typename
1046 if (Tok.is(tok::kw_typename)) {
1047 Diag(Tok, diag::err_expected_class_name_not_template)
1048 << FixItHint::CreateRemoval(Tok.getLocation());
1052 // Parse optional nested-name-specifier
1054 ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false);
1056 BaseLoc = Tok.getLocation();
1058 // Parse decltype-specifier
1059 // tok == kw_decltype is just error recovery, it can only happen when SS
1061 if (Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
1062 if (SS.isNotEmpty())
1063 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
1064 << FixItHint::CreateRemoval(SS.getRange());
1065 // Fake up a Declarator to use with ActOnTypeName.
1066 DeclSpec DS(AttrFactory);
1068 EndLocation = ParseDecltypeSpecifier(DS);
1070 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1071 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1074 // Check whether we have a template-id that names a type.
1075 if (Tok.is(tok::annot_template_id)) {
1076 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1077 if (TemplateId->Kind == TNK_Type_template ||
1078 TemplateId->Kind == TNK_Dependent_template_name) {
1079 AnnotateTemplateIdTokenAsType();
1081 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1082 ParsedType Type = getTypeAnnotation(Tok);
1083 EndLocation = Tok.getAnnotationEndLoc();
1091 // Fall through to produce an error below.
1094 if (Tok.isNot(tok::identifier)) {
1095 Diag(Tok, diag::err_expected_class_name);
1099 IdentifierInfo *Id = Tok.getIdentifierInfo();
1100 SourceLocation IdLoc = ConsumeToken();
1102 if (Tok.is(tok::less)) {
1103 // It looks the user intended to write a template-id here, but the
1104 // template-name was wrong. Try to fix that.
1105 TemplateNameKind TNK = TNK_Type_template;
1106 TemplateTy Template;
1107 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
1108 &SS, Template, TNK)) {
1109 Diag(IdLoc, diag::err_unknown_template_name)
1114 TemplateArgList TemplateArgs;
1115 SourceLocation LAngleLoc, RAngleLoc;
1116 ParseTemplateIdAfterTemplateName(nullptr, IdLoc, SS, true, LAngleLoc,
1117 TemplateArgs, RAngleLoc);
1121 // Form the template name
1122 UnqualifiedId TemplateName;
1123 TemplateName.setIdentifier(Id, IdLoc);
1125 // Parse the full template-id, then turn it into a type.
1126 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1127 TemplateName, true))
1129 if (TNK == TNK_Dependent_template_name)
1130 AnnotateTemplateIdTokenAsType();
1132 // If we didn't end up with a typename token, there's nothing more we
1134 if (Tok.isNot(tok::annot_typename))
1137 // Retrieve the type from the annotation token, consume that token, and
1139 EndLocation = Tok.getAnnotationEndLoc();
1140 ParsedType Type = getTypeAnnotation(Tok);
1145 // We have an identifier; check whether it is actually a type.
1146 IdentifierInfo *CorrectedII = nullptr;
1148 Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, false, nullptr,
1149 /*IsCtorOrDtorName=*/false,
1150 /*NonTrivialTypeSourceInfo=*/true, &CorrectedII);
1152 Diag(IdLoc, diag::err_expected_class_name);
1156 // Consume the identifier.
1157 EndLocation = IdLoc;
1159 // Fake up a Declarator to use with ActOnTypeName.
1160 DeclSpec DS(AttrFactory);
1161 DS.SetRangeStart(IdLoc);
1162 DS.SetRangeEnd(EndLocation);
1163 DS.getTypeSpecScope() = SS;
1165 const char *PrevSpec = nullptr;
1167 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type,
1168 Actions.getASTContext().getPrintingPolicy());
1170 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1171 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1174 void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
1175 while (Tok.isOneOf(tok::kw___single_inheritance,
1176 tok::kw___multiple_inheritance,
1177 tok::kw___virtual_inheritance)) {
1178 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1179 SourceLocation AttrNameLoc = ConsumeToken();
1180 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
1181 AttributeList::AS_Keyword);
1185 /// Determine whether the following tokens are valid after a type-specifier
1186 /// which could be a standalone declaration. This will conservatively return
1187 /// true if there's any doubt, and is appropriate for insert-';' fixits.
1188 bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
1189 // This switch enumerates the valid "follow" set for type-specifiers.
1190 switch (Tok.getKind()) {
1192 case tok::semi: // struct foo {...} ;
1193 case tok::star: // struct foo {...} * P;
1194 case tok::amp: // struct foo {...} & R = ...
1195 case tok::ampamp: // struct foo {...} && R = ...
1196 case tok::identifier: // struct foo {...} V ;
1197 case tok::r_paren: //(struct foo {...} ) {4}
1198 case tok::annot_cxxscope: // struct foo {...} a:: b;
1199 case tok::annot_typename: // struct foo {...} a ::b;
1200 case tok::annot_template_id: // struct foo {...} a<int> ::b;
1201 case tok::l_paren: // struct foo {...} ( x);
1202 case tok::comma: // __builtin_offsetof(struct foo{...} ,
1203 case tok::kw_operator: // struct foo operator ++() {...}
1204 case tok::kw___declspec: // struct foo {...} __declspec(...)
1205 case tok::l_square: // void f(struct f [ 3])
1206 case tok::ellipsis: // void f(struct f ... [Ns])
1207 // FIXME: we should emit semantic diagnostic when declaration
1208 // attribute is in type attribute position.
1209 case tok::kw___attribute: // struct foo __attribute__((used)) x;
1210 case tok::annot_pragma_pack: // struct foo {...} _Pragma(pack(pop));
1211 // struct foo {...} _Pragma(section(...));
1212 case tok::annot_pragma_ms_pragma:
1213 // struct foo {...} _Pragma(vtordisp(pop));
1214 case tok::annot_pragma_ms_vtordisp:
1215 // struct foo {...} _Pragma(pointers_to_members(...));
1216 case tok::annot_pragma_ms_pointers_to_members:
1219 return CouldBeBitfield; // enum E { ... } : 2;
1220 // Microsoft compatibility
1221 case tok::kw___cdecl: // struct foo {...} __cdecl x;
1222 case tok::kw___fastcall: // struct foo {...} __fastcall x;
1223 case tok::kw___stdcall: // struct foo {...} __stdcall x;
1224 case tok::kw___thiscall: // struct foo {...} __thiscall x;
1225 case tok::kw___vectorcall: // struct foo {...} __vectorcall x;
1226 // We will diagnose these calling-convention specifiers on non-function
1227 // declarations later, so claim they are valid after a type specifier.
1228 return getLangOpts().MicrosoftExt;
1230 case tok::kw_const: // struct foo {...} const x;
1231 case tok::kw_volatile: // struct foo {...} volatile x;
1232 case tok::kw_restrict: // struct foo {...} restrict x;
1233 case tok::kw__Atomic: // struct foo {...} _Atomic x;
1234 case tok::kw___unaligned: // struct foo {...} __unaligned *x;
1235 // Function specifiers
1236 // Note, no 'explicit'. An explicit function must be either a conversion
1237 // operator or a constructor. Either way, it can't have a return type.
1238 case tok::kw_inline: // struct foo inline f();
1239 case tok::kw_virtual: // struct foo virtual f();
1240 case tok::kw_friend: // struct foo friend f();
1241 // Storage-class specifiers
1242 case tok::kw_static: // struct foo {...} static x;
1243 case tok::kw_extern: // struct foo {...} extern x;
1244 case tok::kw_typedef: // struct foo {...} typedef x;
1245 case tok::kw_register: // struct foo {...} register x;
1246 case tok::kw_auto: // struct foo {...} auto x;
1247 case tok::kw_mutable: // struct foo {...} mutable x;
1248 case tok::kw_thread_local: // struct foo {...} thread_local x;
1249 case tok::kw_constexpr: // struct foo {...} constexpr x;
1250 // As shown above, type qualifiers and storage class specifiers absolutely
1251 // can occur after class specifiers according to the grammar. However,
1252 // almost no one actually writes code like this. If we see one of these,
1253 // it is much more likely that someone missed a semi colon and the
1254 // type/storage class specifier we're seeing is part of the *next*
1255 // intended declaration, as in:
1257 // struct foo { ... }
1260 // We'd really like to emit a missing semicolon error instead of emitting
1261 // an error on the 'int' saying that you can't have two type specifiers in
1262 // the same declaration of X. Because of this, we look ahead past this
1263 // token to see if it's a type specifier. If so, we know the code is
1264 // otherwise invalid, so we can produce the expected semi error.
1265 if (!isKnownToBeTypeSpecifier(NextToken()))
1268 case tok::r_brace: // struct bar { struct foo {...} }
1269 // Missing ';' at end of struct is accepted as an extension in C mode.
1270 if (!getLangOpts().CPlusPlus)
1274 // template<class T = class X>
1275 return getLangOpts().CPlusPlus;
1280 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1281 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1282 /// until we reach the start of a definition or see a token that
1283 /// cannot start a definition.
1285 /// class-specifier: [C++ class]
1286 /// class-head '{' member-specification[opt] '}'
1287 /// class-head '{' member-specification[opt] '}' attributes[opt]
1289 /// class-key identifier[opt] base-clause[opt]
1290 /// class-key nested-name-specifier identifier base-clause[opt]
1291 /// class-key nested-name-specifier[opt] simple-template-id
1292 /// base-clause[opt]
1293 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1294 /// [GNU] class-key attributes[opt] nested-name-specifier
1295 /// identifier base-clause[opt]
1296 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1297 /// simple-template-id base-clause[opt]
1303 /// elaborated-type-specifier: [C++ dcl.type.elab]
1304 /// class-key ::[opt] nested-name-specifier[opt] identifier
1305 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1306 /// simple-template-id
1308 /// Note that the C++ class-specifier and elaborated-type-specifier,
1309 /// together, subsume the C99 struct-or-union-specifier:
1311 /// struct-or-union-specifier: [C99 6.7.2.1]
1312 /// struct-or-union identifier[opt] '{' struct-contents '}'
1313 /// struct-or-union identifier
1314 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1315 /// '}' attributes[opt]
1316 /// [GNU] struct-or-union attributes[opt] identifier
1317 /// struct-or-union:
1320 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1321 SourceLocation StartLoc, DeclSpec &DS,
1322 const ParsedTemplateInfo &TemplateInfo,
1324 bool EnteringContext, DeclSpecContext DSC,
1325 ParsedAttributesWithRange &Attributes) {
1326 DeclSpec::TST TagType;
1327 if (TagTokKind == tok::kw_struct)
1328 TagType = DeclSpec::TST_struct;
1329 else if (TagTokKind == tok::kw___interface)
1330 TagType = DeclSpec::TST_interface;
1331 else if (TagTokKind == tok::kw_class)
1332 TagType = DeclSpec::TST_class;
1334 assert(TagTokKind == tok::kw_union && "Not a class specifier");
1335 TagType = DeclSpec::TST_union;
1338 if (Tok.is(tok::code_completion)) {
1339 // Code completion for a struct, class, or union name.
1340 Actions.CodeCompleteTag(getCurScope(), TagType);
1341 return cutOffParsing();
1344 // C++03 [temp.explicit] 14.7.2/8:
1345 // The usual access checking rules do not apply to names used to specify
1346 // explicit instantiations.
1348 // As an extension we do not perform access checking on the names used to
1349 // specify explicit specializations either. This is important to allow
1350 // specializing traits classes for private types.
1352 // Note that we don't suppress if this turns out to be an elaborated
1354 bool shouldDelayDiagsInTag =
1355 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1356 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1357 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1359 ParsedAttributesWithRange attrs(AttrFactory);
1360 // If attributes exist after tag, parse them.
1361 MaybeParseGNUAttributes(attrs);
1362 MaybeParseMicrosoftDeclSpecs(attrs);
1364 // Parse inheritance specifiers.
1365 if (Tok.isOneOf(tok::kw___single_inheritance,
1366 tok::kw___multiple_inheritance,
1367 tok::kw___virtual_inheritance))
1368 ParseMicrosoftInheritanceClassAttributes(attrs);
1370 // If C++0x attributes exist here, parse them.
1371 // FIXME: Are we consistent with the ordering of parsing of different
1372 // styles of attributes?
1373 MaybeParseCXX11Attributes(attrs);
1375 // Source location used by FIXIT to insert misplaced
1377 SourceLocation AttrFixitLoc = Tok.getLocation();
1379 if (TagType == DeclSpec::TST_struct &&
1380 Tok.isNot(tok::identifier) &&
1381 !Tok.isAnnotation() &&
1382 Tok.getIdentifierInfo() &&
1383 Tok.isOneOf(tok::kw___is_abstract,
1384 tok::kw___is_arithmetic,
1386 tok::kw___is_assignable,
1387 tok::kw___is_base_of,
1389 tok::kw___is_complete_type,
1390 tok::kw___is_compound,
1392 tok::kw___is_constructible,
1393 tok::kw___is_convertible,
1394 tok::kw___is_convertible_to,
1395 tok::kw___is_destructible,
1398 tok::kw___is_floating_point,
1400 tok::kw___is_function,
1401 tok::kw___is_fundamental,
1402 tok::kw___is_integral,
1403 tok::kw___is_interface_class,
1404 tok::kw___is_literal,
1405 tok::kw___is_lvalue_expr,
1406 tok::kw___is_lvalue_reference,
1407 tok::kw___is_member_function_pointer,
1408 tok::kw___is_member_object_pointer,
1409 tok::kw___is_member_pointer,
1410 tok::kw___is_nothrow_assignable,
1411 tok::kw___is_nothrow_constructible,
1412 tok::kw___is_nothrow_destructible,
1413 tok::kw___is_object,
1415 tok::kw___is_pointer,
1416 tok::kw___is_polymorphic,
1417 tok::kw___is_reference,
1418 tok::kw___is_rvalue_expr,
1419 tok::kw___is_rvalue_reference,
1421 tok::kw___is_scalar,
1422 tok::kw___is_sealed,
1423 tok::kw___is_signed,
1424 tok::kw___is_standard_layout,
1425 tok::kw___is_trivial,
1426 tok::kw___is_trivially_assignable,
1427 tok::kw___is_trivially_constructible,
1428 tok::kw___is_trivially_copyable,
1430 tok::kw___is_unsigned,
1432 tok::kw___is_volatile))
1433 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1434 // name of struct templates, but some are keywords in GCC >= 4.3
1435 // and Clang. Therefore, when we see the token sequence "struct
1436 // X", make X into a normal identifier rather than a keyword, to
1437 // allow libstdc++ 4.2 and libc++ to work properly.
1438 TryKeywordIdentFallback(true);
1440 struct PreserveAtomicIdentifierInfoRAII {
1441 PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled)
1442 : AtomicII(nullptr) {
1445 assert(Tok.is(tok::kw__Atomic));
1446 AtomicII = Tok.getIdentifierInfo();
1447 AtomicII->revertTokenIDToIdentifier();
1448 Tok.setKind(tok::identifier);
1450 ~PreserveAtomicIdentifierInfoRAII() {
1453 AtomicII->revertIdentifierToTokenID(tok::kw__Atomic);
1455 IdentifierInfo *AtomicII;
1458 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
1459 // implementation for VS2013 uses _Atomic as an identifier for one of the
1460 // classes in <atomic>. When we are parsing 'struct _Atomic', don't consider
1461 // '_Atomic' to be a keyword. We are careful to undo this so that clang can
1462 // use '_Atomic' in its own header files.
1463 bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat &&
1464 Tok.is(tok::kw__Atomic) &&
1465 TagType == DeclSpec::TST_struct;
1466 PreserveAtomicIdentifierInfoRAII AtomicTokenGuard(
1467 Tok, ShouldChangeAtomicToIdentifier);
1469 // Parse the (optional) nested-name-specifier.
1470 CXXScopeSpec &SS = DS.getTypeSpecScope();
1471 if (getLangOpts().CPlusPlus) {
1472 // "FOO : BAR" is not a potential typo for "FOO::BAR". In this context it
1473 // is a base-specifier-list.
1474 ColonProtectionRAIIObject X(*this);
1477 bool HasValidSpec = true;
1478 if (ParseOptionalCXXScopeSpecifier(Spec, nullptr, EnteringContext)) {
1479 DS.SetTypeSpecError();
1480 HasValidSpec = false;
1483 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) {
1484 Diag(Tok, diag::err_expected) << tok::identifier;
1485 HasValidSpec = false;
1491 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1493 // Parse the (optional) class name or simple-template-id.
1494 IdentifierInfo *Name = nullptr;
1495 SourceLocation NameLoc;
1496 TemplateIdAnnotation *TemplateId = nullptr;
1497 if (Tok.is(tok::identifier)) {
1498 Name = Tok.getIdentifierInfo();
1499 NameLoc = ConsumeToken();
1501 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1502 // The name was supposed to refer to a template, but didn't.
1503 // Eat the template argument list and try to continue parsing this as
1504 // a class (or template thereof).
1505 TemplateArgList TemplateArgs;
1506 SourceLocation LAngleLoc, RAngleLoc;
1507 if (ParseTemplateIdAfterTemplateName(
1508 nullptr, NameLoc, SS, true, LAngleLoc, TemplateArgs, RAngleLoc)) {
1509 // We couldn't parse the template argument list at all, so don't
1510 // try to give any location information for the list.
1511 LAngleLoc = RAngleLoc = SourceLocation();
1514 Diag(NameLoc, diag::err_explicit_spec_non_template)
1515 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1516 << TagTokKind << Name << SourceRange(LAngleLoc, RAngleLoc);
1518 // Strip off the last template parameter list if it was empty, since
1519 // we've removed its template argument list.
1520 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1521 if (TemplateParams->size() > 1) {
1522 TemplateParams->pop_back();
1524 TemplateParams = nullptr;
1525 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1526 = ParsedTemplateInfo::NonTemplate;
1528 } else if (TemplateInfo.Kind
1529 == ParsedTemplateInfo::ExplicitInstantiation) {
1530 // Pretend this is just a forward declaration.
1531 TemplateParams = nullptr;
1532 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1533 = ParsedTemplateInfo::NonTemplate;
1534 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
1536 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
1540 } else if (Tok.is(tok::annot_template_id)) {
1541 TemplateId = takeTemplateIdAnnotation(Tok);
1542 NameLoc = ConsumeToken();
1544 if (TemplateId->Kind != TNK_Type_template &&
1545 TemplateId->Kind != TNK_Dependent_template_name) {
1546 // The template-name in the simple-template-id refers to
1547 // something other than a class template. Give an appropriate
1548 // error message and skip to the ';'.
1549 SourceRange Range(NameLoc);
1550 if (SS.isNotEmpty())
1551 Range.setBegin(SS.getBeginLoc());
1553 // FIXME: Name may be null here.
1554 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1555 << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;
1557 DS.SetTypeSpecError();
1558 SkipUntil(tok::semi, StopBeforeMatch);
1563 // There are four options here.
1564 // - If we are in a trailing return type, this is always just a reference,
1565 // and we must not try to parse a definition. For instance,
1566 // [] () -> struct S { };
1567 // does not define a type.
1568 // - If we have 'struct foo {...', 'struct foo :...',
1569 // 'struct foo final :' or 'struct foo final {', then this is a definition.
1570 // - If we have 'struct foo;', then this is either a forward declaration
1571 // or a friend declaration, which have to be treated differently.
1572 // - Otherwise we have something like 'struct foo xyz', a reference.
1574 // We also detect these erroneous cases to provide better diagnostic for
1575 // C++11 attributes parsing.
1576 // - attributes follow class name:
1577 // struct foo [[]] {};
1578 // - attributes appear before or after 'final':
1579 // struct foo [[]] final [[]] {};
1581 // However, in type-specifier-seq's, things look like declarations but are
1582 // just references, e.g.
1585 // &T::operator struct s;
1586 // For these, DSC is DSC_type_specifier or DSC_alias_declaration.
1588 // If there are attributes after class name, parse them.
1589 MaybeParseCXX11Attributes(Attributes);
1591 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1592 Sema::TagUseKind TUK;
1593 if (DSC == DSC_trailing)
1594 TUK = Sema::TUK_Reference;
1595 else if (Tok.is(tok::l_brace) ||
1596 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1597 (isCXX11FinalKeyword() &&
1598 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1599 if (DS.isFriendSpecified()) {
1600 // C++ [class.friend]p2:
1601 // A class shall not be defined in a friend declaration.
1602 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1603 << SourceRange(DS.getFriendSpecLoc());
1605 // Skip everything up to the semicolon, so that this looks like a proper
1606 // friend class (or template thereof) declaration.
1607 SkipUntil(tok::semi, StopBeforeMatch);
1608 TUK = Sema::TUK_Friend;
1610 // Okay, this is a class definition.
1611 TUK = Sema::TUK_Definition;
1613 } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) ||
1614 NextToken().is(tok::kw_alignas))) {
1615 // We can't tell if this is a definition or reference
1616 // until we skipped the 'final' and C++11 attribute specifiers.
1617 TentativeParsingAction PA(*this);
1619 // Skip the 'final' keyword.
1622 // Skip C++11 attribute specifiers.
1624 if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
1626 if (!SkipUntil(tok::r_square, StopAtSemi))
1628 } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
1631 if (!SkipUntil(tok::r_paren, StopAtSemi))
1638 if (Tok.isOneOf(tok::l_brace, tok::colon))
1639 TUK = Sema::TUK_Definition;
1641 TUK = Sema::TUK_Reference;
1644 } else if (!isTypeSpecifier(DSC) &&
1645 (Tok.is(tok::semi) ||
1646 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1647 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1648 if (Tok.isNot(tok::semi)) {
1649 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1650 // A semicolon was missing after this declaration. Diagnose and recover.
1651 ExpectAndConsume(tok::semi, diag::err_expected_after,
1652 DeclSpec::getSpecifierName(TagType, PPol));
1654 Tok.setKind(tok::semi);
1657 TUK = Sema::TUK_Reference;
1659 // Forbid misplaced attributes. In cases of a reference, we pass attributes
1660 // to caller to handle.
1661 if (TUK != Sema::TUK_Reference) {
1662 // If this is not a reference, then the only possible
1663 // valid place for C++11 attributes to appear here
1664 // is between class-key and class-name. If there are
1665 // any attributes after class-name, we try a fixit to move
1666 // them to the right place.
1667 SourceRange AttrRange = Attributes.Range;
1668 if (AttrRange.isValid()) {
1669 Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
1671 << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
1672 CharSourceRange(AttrRange, true))
1673 << FixItHint::CreateRemoval(AttrRange);
1675 // Recover by adding misplaced attributes to the attribute list
1676 // of the class so they can be applied on the class later.
1677 attrs.takeAllFrom(Attributes);
1681 // If this is an elaborated type specifier, and we delayed
1682 // diagnostics before, just merge them into the current pool.
1683 if (shouldDelayDiagsInTag) {
1684 diagsFromTag.done();
1685 if (TUK == Sema::TUK_Reference)
1686 diagsFromTag.redelay();
1689 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1690 TUK != Sema::TUK_Definition)) {
1691 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1692 // We have a declaration or reference to an anonymous class.
1693 Diag(StartLoc, diag::err_anon_type_definition)
1694 << DeclSpec::getSpecifierName(TagType, Policy);
1697 // If we are parsing a definition and stop at a base-clause, continue on
1698 // until the semicolon. Continuing from the comma will just trick us into
1699 // thinking we are seeing a variable declaration.
1700 if (TUK == Sema::TUK_Definition && Tok.is(tok::colon))
1701 SkipUntil(tok::semi, StopBeforeMatch);
1703 SkipUntil(tok::comma, StopAtSemi);
1707 // Create the tag portion of the class or class template.
1708 DeclResult TagOrTempResult = true; // invalid
1709 TypeResult TypeResult = true; // invalid
1712 Sema::SkipBodyInfo SkipBody;
1714 // Explicit specialization, class template partial specialization,
1715 // or explicit instantiation.
1716 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1717 TemplateId->NumArgs);
1718 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1719 TUK == Sema::TUK_Declaration) {
1720 // This is an explicit instantiation of a class template.
1721 ProhibitAttributes(attrs);
1724 = Actions.ActOnExplicitInstantiation(getCurScope(),
1725 TemplateInfo.ExternLoc,
1726 TemplateInfo.TemplateLoc,
1730 TemplateId->Template,
1731 TemplateId->TemplateNameLoc,
1732 TemplateId->LAngleLoc,
1734 TemplateId->RAngleLoc,
1737 // Friend template-ids are treated as references unless
1738 // they have template headers, in which case they're ill-formed
1739 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1740 // We diagnose this error in ActOnClassTemplateSpecialization.
1741 } else if (TUK == Sema::TUK_Reference ||
1742 (TUK == Sema::TUK_Friend &&
1743 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1744 ProhibitAttributes(attrs);
1745 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1747 TemplateId->TemplateKWLoc,
1748 TemplateId->Template,
1749 TemplateId->TemplateNameLoc,
1750 TemplateId->LAngleLoc,
1752 TemplateId->RAngleLoc);
1754 // This is an explicit specialization or a class template
1755 // partial specialization.
1756 TemplateParameterLists FakedParamLists;
1757 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1758 // This looks like an explicit instantiation, because we have
1761 // template class Foo<X>
1763 // but it actually has a definition. Most likely, this was
1764 // meant to be an explicit specialization, but the user forgot
1765 // the '<>' after 'template'.
1766 // It this is friend declaration however, since it cannot have a
1767 // template header, it is most likely that the user meant to
1768 // remove the 'template' keyword.
1769 assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&
1770 "Expected a definition here");
1772 if (TUK == Sema::TUK_Friend) {
1773 Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation);
1774 TemplateParams = nullptr;
1776 SourceLocation LAngleLoc =
1777 PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1778 Diag(TemplateId->TemplateNameLoc,
1779 diag::err_explicit_instantiation_with_definition)
1780 << SourceRange(TemplateInfo.TemplateLoc)
1781 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1783 // Create a fake template parameter list that contains only
1784 // "template<>", so that we treat this construct as a class
1785 // template specialization.
1786 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
1787 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
1788 LAngleLoc, nullptr));
1789 TemplateParams = &FakedParamLists;
1793 // Build the class template specialization.
1794 TagOrTempResult = Actions.ActOnClassTemplateSpecialization(
1795 getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(),
1796 *TemplateId, attrs.getList(),
1797 MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0]
1799 TemplateParams ? TemplateParams->size() : 0),
1802 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1803 TUK == Sema::TUK_Declaration) {
1804 // Explicit instantiation of a member of a class template
1805 // specialization, e.g.,
1807 // template struct Outer<int>::Inner;
1809 ProhibitAttributes(attrs);
1812 = Actions.ActOnExplicitInstantiation(getCurScope(),
1813 TemplateInfo.ExternLoc,
1814 TemplateInfo.TemplateLoc,
1815 TagType, StartLoc, SS, Name,
1816 NameLoc, attrs.getList());
1817 } else if (TUK == Sema::TUK_Friend &&
1818 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1819 ProhibitAttributes(attrs);
1822 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1823 TagType, StartLoc, SS,
1824 Name, NameLoc, attrs.getList(),
1825 MultiTemplateParamsArg(
1826 TemplateParams? &(*TemplateParams)[0]
1828 TemplateParams? TemplateParams->size() : 0));
1830 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1831 ProhibitAttributes(attrs);
1833 if (TUK == Sema::TUK_Definition &&
1834 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1835 // If the declarator-id is not a template-id, issue a diagnostic and
1836 // recover by ignoring the 'template' keyword.
1837 Diag(Tok, diag::err_template_defn_explicit_instantiation)
1838 << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
1839 TemplateParams = nullptr;
1842 bool IsDependent = false;
1844 // Don't pass down template parameter lists if this is just a tag
1845 // reference. For example, we don't need the template parameters here:
1846 // template <class T> class A *makeA(T t);
1847 MultiTemplateParamsArg TParams;
1848 if (TUK != Sema::TUK_Reference && TemplateParams)
1850 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1852 stripTypeAttributesOffDeclSpec(attrs, DS, TUK);
1854 // Declaration or definition of a class type
1855 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1856 SS, Name, NameLoc, attrs.getList(), AS,
1857 DS.getModulePrivateSpecLoc(),
1858 TParams, Owned, IsDependent,
1859 SourceLocation(), false,
1860 clang::TypeResult(),
1861 DSC == DSC_type_specifier,
1864 // If ActOnTag said the type was dependent, try again with the
1865 // less common call.
1867 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1868 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1869 SS, Name, StartLoc, NameLoc);
1873 // If there is a body, parse it and inform the actions module.
1874 if (TUK == Sema::TUK_Definition) {
1875 assert(Tok.is(tok::l_brace) ||
1876 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1877 isCXX11FinalKeyword());
1878 if (SkipBody.ShouldSkip)
1879 SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType,
1880 TagOrTempResult.get());
1881 else if (getLangOpts().CPlusPlus)
1882 ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
1883 TagOrTempResult.get());
1885 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1888 const char *PrevSpec = nullptr;
1891 if (!TypeResult.isInvalid()) {
1892 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1893 NameLoc.isValid() ? NameLoc : StartLoc,
1894 PrevSpec, DiagID, TypeResult.get(), Policy);
1895 } else if (!TagOrTempResult.isInvalid()) {
1896 Result = DS.SetTypeSpecType(TagType, StartLoc,
1897 NameLoc.isValid() ? NameLoc : StartLoc,
1898 PrevSpec, DiagID, TagOrTempResult.get(), Owned,
1901 DS.SetTypeSpecError();
1906 Diag(StartLoc, DiagID) << PrevSpec;
1908 // At this point, we've successfully parsed a class-specifier in 'definition'
1909 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1910 // going to look at what comes after it to improve error recovery. If an
1911 // impossible token occurs next, we assume that the programmer forgot a ; at
1912 // the end of the declaration and recover that way.
1914 // Also enforce C++ [temp]p3:
1915 // In a template-declaration which defines a class, no declarator
1918 // After a type-specifier, we don't expect a semicolon. This only happens in
1919 // C, since definitions are not permitted in this context in C++.
1920 if (TUK == Sema::TUK_Definition &&
1921 (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) &&
1922 (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
1923 if (Tok.isNot(tok::semi)) {
1924 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1925 ExpectAndConsume(tok::semi, diag::err_expected_after,
1926 DeclSpec::getSpecifierName(TagType, PPol));
1927 // Push this token back into the preprocessor and change our current token
1928 // to ';' so that the rest of the code recovers as though there were an
1929 // ';' after the definition.
1931 Tok.setKind(tok::semi);
1936 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1938 /// base-clause : [C++ class.derived]
1939 /// ':' base-specifier-list
1940 /// base-specifier-list:
1941 /// base-specifier '...'[opt]
1942 /// base-specifier-list ',' base-specifier '...'[opt]
1943 void Parser::ParseBaseClause(Decl *ClassDecl) {
1944 assert(Tok.is(tok::colon) && "Not a base clause");
1947 // Build up an array of parsed base specifiers.
1948 SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1951 // Parse a base-specifier.
1952 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1953 if (Result.isInvalid()) {
1954 // Skip the rest of this base specifier, up until the comma or
1956 SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch);
1958 // Add this to our array of base specifiers.
1959 BaseInfo.push_back(Result.get());
1962 // If the next token is a comma, consume it and keep reading
1964 if (!TryConsumeToken(tok::comma))
1968 // Attach the base specifiers
1969 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo);
1972 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1973 /// one entry in the base class list of a class specifier, for example:
1974 /// class foo : public bar, virtual private baz {
1975 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1977 /// base-specifier: [C++ class.derived]
1978 /// attribute-specifier-seq[opt] base-type-specifier
1979 /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
1980 /// base-type-specifier
1981 /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
1982 /// base-type-specifier
1983 BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1984 bool IsVirtual = false;
1985 SourceLocation StartLoc = Tok.getLocation();
1987 ParsedAttributesWithRange Attributes(AttrFactory);
1988 MaybeParseCXX11Attributes(Attributes);
1990 // Parse the 'virtual' keyword.
1991 if (TryConsumeToken(tok::kw_virtual))
1994 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1996 // Parse an (optional) access specifier.
1997 AccessSpecifier Access = getAccessSpecifierIfPresent();
1998 if (Access != AS_none)
2001 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2003 // Parse the 'virtual' keyword (again!), in case it came after the
2004 // access specifier.
2005 if (Tok.is(tok::kw_virtual)) {
2006 SourceLocation VirtualLoc = ConsumeToken();
2008 // Complain about duplicate 'virtual'
2009 Diag(VirtualLoc, diag::err_dup_virtual)
2010 << FixItHint::CreateRemoval(VirtualLoc);
2016 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2018 // Parse the class-name.
2020 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
2021 // implementation for VS2013 uses _Atomic as an identifier for one of the
2022 // classes in <atomic>. Treat '_Atomic' to be an identifier when we are
2023 // parsing the class-name for a base specifier.
2024 if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
2025 NextToken().is(tok::less))
2026 Tok.setKind(tok::identifier);
2028 SourceLocation EndLocation;
2029 SourceLocation BaseLoc;
2030 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
2031 if (BaseType.isInvalid())
2034 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
2035 // actually part of the base-specifier-list grammar productions, but we
2036 // parse it here for convenience.
2037 SourceLocation EllipsisLoc;
2038 TryConsumeToken(tok::ellipsis, EllipsisLoc);
2040 // Find the complete source range for the base-specifier.
2041 SourceRange Range(StartLoc, EndLocation);
2043 // Notify semantic analysis that we have parsed a complete
2045 return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
2046 Access, BaseType.get(), BaseLoc,
2050 /// getAccessSpecifierIfPresent - Determine whether the next token is
2051 /// a C++ access-specifier.
2053 /// access-specifier: [C++ class.derived]
2057 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
2058 switch (Tok.getKind()) {
2059 default: return AS_none;
2060 case tok::kw_private: return AS_private;
2061 case tok::kw_protected: return AS_protected;
2062 case tok::kw_public: return AS_public;
2066 /// \brief If the given declarator has any parts for which parsing has to be
2067 /// delayed, e.g., default arguments or an exception-specification, create a
2068 /// late-parsed method declaration record to handle the parsing at the end of
2069 /// the class definition.
2070 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
2072 DeclaratorChunk::FunctionTypeInfo &FTI
2073 = DeclaratorInfo.getFunctionTypeInfo();
2074 // If there was a late-parsed exception-specification, we'll need a
2076 bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed;
2078 if (!NeedLateParse) {
2079 // Look ahead to see if there are any default args
2080 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) {
2081 auto Param = cast<ParmVarDecl>(FTI.Params[ParamIdx].Param);
2082 if (Param->hasUnparsedDefaultArg()) {
2083 NeedLateParse = true;
2089 if (NeedLateParse) {
2090 // Push this method onto the stack of late-parsed method
2092 auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
2093 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
2094 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
2096 // Stash the exception-specification tokens in the late-pased method.
2097 LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
2098 FTI.ExceptionSpecTokens = nullptr;
2100 // Push tokens for each parameter. Those that do not have
2101 // defaults will be NULL.
2102 LateMethod->DefaultArgs.reserve(FTI.NumParams);
2103 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx)
2104 LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument(
2105 FTI.Params[ParamIdx].Param,
2106 std::move(FTI.Params[ParamIdx].DefaultArgTokens)));
2110 /// isCXX11VirtSpecifier - Determine whether the given token is a C++11
2117 VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
2118 if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier))
2119 return VirtSpecifiers::VS_None;
2121 IdentifierInfo *II = Tok.getIdentifierInfo();
2123 // Initialize the contextual keywords.
2125 Ident_final = &PP.getIdentifierTable().get("final");
2126 if (getLangOpts().GNUKeywords)
2127 Ident_GNU_final = &PP.getIdentifierTable().get("__final");
2128 if (getLangOpts().MicrosoftExt)
2129 Ident_sealed = &PP.getIdentifierTable().get("sealed");
2130 Ident_override = &PP.getIdentifierTable().get("override");
2133 if (II == Ident_override)
2134 return VirtSpecifiers::VS_Override;
2136 if (II == Ident_sealed)
2137 return VirtSpecifiers::VS_Sealed;
2139 if (II == Ident_final)
2140 return VirtSpecifiers::VS_Final;
2142 if (II == Ident_GNU_final)
2143 return VirtSpecifiers::VS_GNU_Final;
2145 return VirtSpecifiers::VS_None;
2148 /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
2150 /// virt-specifier-seq:
2152 /// virt-specifier-seq virt-specifier
2153 void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
2155 SourceLocation FriendLoc) {
2157 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2158 if (Specifier == VirtSpecifiers::VS_None)
2161 if (FriendLoc.isValid()) {
2162 Diag(Tok.getLocation(), diag::err_friend_decl_spec)
2163 << VirtSpecifiers::getSpecifierName(Specifier)
2164 << FixItHint::CreateRemoval(Tok.getLocation())
2165 << SourceRange(FriendLoc, FriendLoc);
2170 // C++ [class.mem]p8:
2171 // A virt-specifier-seq shall contain at most one of each virt-specifier.
2172 const char *PrevSpec = nullptr;
2173 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
2174 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
2176 << FixItHint::CreateRemoval(Tok.getLocation());
2178 if (IsInterface && (Specifier == VirtSpecifiers::VS_Final ||
2179 Specifier == VirtSpecifiers::VS_Sealed)) {
2180 Diag(Tok.getLocation(), diag::err_override_control_interface)
2181 << VirtSpecifiers::getSpecifierName(Specifier);
2182 } else if (Specifier == VirtSpecifiers::VS_Sealed) {
2183 Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword);
2184 } else if (Specifier == VirtSpecifiers::VS_GNU_Final) {
2185 Diag(Tok.getLocation(), diag::ext_warn_gnu_final);
2187 Diag(Tok.getLocation(),
2188 getLangOpts().CPlusPlus11
2189 ? diag::warn_cxx98_compat_override_control_keyword
2190 : diag::ext_override_control_keyword)
2191 << VirtSpecifiers::getSpecifierName(Specifier);
2197 /// isCXX11FinalKeyword - Determine whether the next token is a C++11
2198 /// 'final' or Microsoft 'sealed' contextual keyword.
2199 bool Parser::isCXX11FinalKeyword() const {
2200 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2201 return Specifier == VirtSpecifiers::VS_Final ||
2202 Specifier == VirtSpecifiers::VS_GNU_Final ||
2203 Specifier == VirtSpecifiers::VS_Sealed;
2206 /// \brief Parse a C++ member-declarator up to, but not including, the optional
2207 /// brace-or-equal-initializer or pure-specifier.
2208 bool Parser::ParseCXXMemberDeclaratorBeforeInitializer(
2209 Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize,
2210 LateParsedAttrList &LateParsedAttrs) {
2211 // member-declarator:
2212 // declarator pure-specifier[opt]
2213 // declarator brace-or-equal-initializer[opt]
2214 // identifier[opt] ':' constant-expression
2215 if (Tok.isNot(tok::colon))
2216 ParseDeclarator(DeclaratorInfo);
2218 DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation());
2220 if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) {
2221 assert(DeclaratorInfo.isPastIdentifier() &&
2222 "don't know where identifier would go yet?");
2223 BitfieldSize = ParseConstantExpression();
2224 if (BitfieldSize.isInvalid())
2225 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2227 ParseOptionalCXX11VirtSpecifierSeq(
2228 VS, getCurrentClass().IsInterface,
2229 DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2231 MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2234 // If a simple-asm-expr is present, parse it.
2235 if (Tok.is(tok::kw_asm)) {
2237 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2238 if (AsmLabel.isInvalid())
2239 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2241 DeclaratorInfo.setAsmLabel(AsmLabel.get());
2242 DeclaratorInfo.SetRangeEnd(Loc);
2245 // If attributes exist after the declarator, but before an '{', parse them.
2246 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2248 // For compatibility with code written to older Clang, also accept a
2249 // virt-specifier *after* the GNU attributes.
2250 if (BitfieldSize.isUnset() && VS.isUnset()) {
2251 ParseOptionalCXX11VirtSpecifierSeq(
2252 VS, getCurrentClass().IsInterface,
2253 DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2254 if (!VS.isUnset()) {
2255 // If we saw any GNU-style attributes that are known to GCC followed by a
2256 // virt-specifier, issue a GCC-compat warning.
2257 const AttributeList *Attr = DeclaratorInfo.getAttributes();
2259 if (Attr->isKnownToGCC() && !Attr->isCXX11Attribute())
2260 Diag(Attr->getLoc(), diag::warn_gcc_attribute_location);
2261 Attr = Attr->getNext();
2263 MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2267 // If this has neither a name nor a bit width, something has gone seriously
2268 // wrong. Skip until the semi-colon or }.
2269 if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) {
2270 // If so, skip until the semi-colon or a }.
2271 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2277 /// \brief Look for declaration specifiers possibly occurring after C++11
2278 /// virt-specifier-seq and diagnose them.
2279 void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(
2281 VirtSpecifiers &VS) {
2282 DeclSpec DS(AttrFactory);
2284 // GNU-style and C++11 attributes are not allowed here, but they will be
2285 // handled by the caller. Diagnose everything else.
2286 ParseTypeQualifierListOpt(DS, AR_NoAttributesParsed, false);
2287 D.ExtendWithDeclSpec(DS);
2289 if (D.isFunctionDeclarator()) {
2290 auto &Function = D.getFunctionTypeInfo();
2291 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
2292 auto DeclSpecCheck = [&] (DeclSpec::TQ TypeQual,
2293 const char *FixItName,
2294 SourceLocation SpecLoc,
2295 unsigned* QualifierLoc) {
2296 FixItHint Insertion;
2297 if (DS.getTypeQualifiers() & TypeQual) {
2298 if (!(Function.TypeQuals & TypeQual)) {
2299 std::string Name(FixItName);
2301 Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2302 Function.TypeQuals |= TypeQual;
2303 *QualifierLoc = SpecLoc.getRawEncoding();
2305 Diag(SpecLoc, diag::err_declspec_after_virtspec)
2307 << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
2308 << FixItHint::CreateRemoval(SpecLoc)
2312 DeclSpecCheck(DeclSpec::TQ_const, "const", DS.getConstSpecLoc(),
2313 &Function.ConstQualifierLoc);
2314 DeclSpecCheck(DeclSpec::TQ_volatile, "volatile", DS.getVolatileSpecLoc(),
2315 &Function.VolatileQualifierLoc);
2316 DeclSpecCheck(DeclSpec::TQ_restrict, "restrict", DS.getRestrictSpecLoc(),
2317 &Function.RestrictQualifierLoc);
2320 // Parse ref-qualifiers.
2321 bool RefQualifierIsLValueRef = true;
2322 SourceLocation RefQualifierLoc;
2323 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) {
2324 const char *Name = (RefQualifierIsLValueRef ? "& " : "&& ");
2325 FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2326 Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef;
2327 Function.RefQualifierLoc = RefQualifierLoc.getRawEncoding();
2329 Diag(RefQualifierLoc, diag::err_declspec_after_virtspec)
2330 << (RefQualifierIsLValueRef ? "&" : "&&")
2331 << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
2332 << FixItHint::CreateRemoval(RefQualifierLoc)
2334 D.SetRangeEnd(RefQualifierLoc);
2339 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
2341 /// member-declaration:
2342 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
2343 /// function-definition ';'[opt]
2344 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
2345 /// using-declaration [TODO]
2346 /// [C++0x] static_assert-declaration
2347 /// template-declaration
2348 /// [GNU] '__extension__' member-declaration
2350 /// member-declarator-list:
2351 /// member-declarator
2352 /// member-declarator-list ',' member-declarator
2354 /// member-declarator:
2355 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
2356 /// declarator constant-initializer[opt]
2357 /// [C++11] declarator brace-or-equal-initializer[opt]
2358 /// identifier[opt] ':' constant-expression
2360 /// virt-specifier-seq:
2362 /// virt-specifier-seq virt-specifier
2372 /// constant-initializer:
2373 /// '=' constant-expression
2375 Parser::DeclGroupPtrTy
2376 Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
2377 AttributeList *AccessAttrs,
2378 const ParsedTemplateInfo &TemplateInfo,
2379 ParsingDeclRAIIObject *TemplateDiags) {
2380 if (Tok.is(tok::at)) {
2381 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
2382 Diag(Tok, diag::err_at_defs_cxx);
2384 Diag(Tok, diag::err_at_in_class);
2387 SkipUntil(tok::r_brace, StopAtSemi);
2391 // Turn on colon protection early, while parsing declspec, although there is
2392 // nothing to protect there. It prevents from false errors if error recovery
2393 // incorrectly determines where the declspec ends, as in the example:
2394 // struct A { enum class B { C }; };
2396 // struct D { A::B : C; };
2397 ColonProtectionRAIIObject X(*this);
2399 // Access declarations.
2400 bool MalformedTypeSpec = false;
2401 if (!TemplateInfo.Kind &&
2402 Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
2403 if (TryAnnotateCXXScopeToken())
2404 MalformedTypeSpec = true;
2407 if (Tok.isNot(tok::annot_cxxscope))
2408 isAccessDecl = false;
2409 else if (NextToken().is(tok::identifier))
2410 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
2412 isAccessDecl = NextToken().is(tok::kw_operator);
2415 // Collect the scope specifier token we annotated earlier.
2417 ParseOptionalCXXScopeSpecifier(SS, nullptr,
2418 /*EnteringContext=*/false);
2420 if (SS.isInvalid()) {
2421 SkipUntil(tok::semi);
2425 // Try to parse an unqualified-id.
2426 SourceLocation TemplateKWLoc;
2428 if (ParseUnqualifiedId(SS, false, true, true, nullptr, TemplateKWLoc,
2430 SkipUntil(tok::semi);
2434 // TODO: recover from mistakenly-qualified operator declarations.
2435 if (ExpectAndConsume(tok::semi, diag::err_expected_after,
2436 "access declaration")) {
2437 SkipUntil(tok::semi);
2441 return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration(
2442 getCurScope(), AS, /*UsingLoc*/ SourceLocation(),
2443 /*TypenameLoc*/ SourceLocation(), SS, Name,
2444 /*EllipsisLoc*/ SourceLocation(), /*AttrList*/ nullptr)));
2448 // static_assert-declaration. A templated static_assert declaration is
2449 // diagnosed in Parser::ParseSingleDeclarationAfterTemplate.
2450 if (!TemplateInfo.Kind &&
2451 Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) {
2452 SourceLocation DeclEnd;
2453 return DeclGroupPtrTy::make(
2454 DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd)));
2457 if (Tok.is(tok::kw_template)) {
2458 assert(!TemplateInfo.TemplateParams &&
2459 "Nested template improperly parsed?");
2460 SourceLocation DeclEnd;
2461 return DeclGroupPtrTy::make(
2462 DeclGroupRef(ParseDeclarationStartingWithTemplate(
2463 Declarator::MemberContext, DeclEnd, AS, AccessAttrs)));
2466 // Handle: member-declaration ::= '__extension__' member-declaration
2467 if (Tok.is(tok::kw___extension__)) {
2468 // __extension__ silences extension warnings in the subexpression.
2469 ExtensionRAIIObject O(Diags); // Use RAII to do this.
2471 return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
2472 TemplateInfo, TemplateDiags);
2475 ParsedAttributesWithRange attrs(AttrFactory);
2476 ParsedAttributesWithRange FnAttrs(AttrFactory);
2477 // Optional C++11 attribute-specifier
2478 MaybeParseCXX11Attributes(attrs);
2479 // We need to keep these attributes for future diagnostic
2480 // before they are taken over by declaration specifier.
2481 FnAttrs.addAll(attrs.getList());
2482 FnAttrs.Range = attrs.Range;
2484 MaybeParseMicrosoftAttributes(attrs);
2486 if (Tok.is(tok::kw_using)) {
2487 ProhibitAttributes(attrs);
2490 SourceLocation UsingLoc = ConsumeToken();
2492 if (Tok.is(tok::kw_namespace)) {
2493 Diag(UsingLoc, diag::err_using_namespace_in_class);
2494 SkipUntil(tok::semi, StopBeforeMatch);
2497 SourceLocation DeclEnd;
2498 // Otherwise, it must be a using-declaration or an alias-declaration.
2499 return ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
2500 UsingLoc, DeclEnd, AS);
2503 // Hold late-parsed attributes so we can attach a Decl to them later.
2504 LateParsedAttrList CommonLateParsedAttrs;
2506 // decl-specifier-seq:
2507 // Parse the common declaration-specifiers piece.
2508 ParsingDeclSpec DS(*this, TemplateDiags);
2509 DS.takeAttributesFrom(attrs);
2510 if (MalformedTypeSpec)
2511 DS.SetTypeSpecError();
2513 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class,
2514 &CommonLateParsedAttrs);
2516 // Turn off colon protection that was set for declspec.
2519 // If we had a free-standing type definition with a missing semicolon, we
2520 // may get this far before the problem becomes obvious.
2521 if (DS.hasTagDefinition() &&
2522 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate &&
2523 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_class,
2524 &CommonLateParsedAttrs))
2527 MultiTemplateParamsArg TemplateParams(
2528 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data()
2530 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
2532 if (TryConsumeToken(tok::semi)) {
2533 if (DS.isFriendSpecified())
2534 ProhibitAttributes(FnAttrs);
2536 RecordDecl *AnonRecord = nullptr;
2537 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
2538 getCurScope(), AS, DS, TemplateParams, false, AnonRecord);
2539 DS.complete(TheDecl);
2541 Decl* decls[] = {AnonRecord, TheDecl};
2542 return Actions.BuildDeclaratorGroup(decls);
2544 return Actions.ConvertDeclToDeclGroup(TheDecl);
2547 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
2550 // Hold late-parsed attributes so we can attach a Decl to them later.
2551 LateParsedAttrList LateParsedAttrs;
2553 SourceLocation EqualLoc;
2554 SourceLocation PureSpecLoc;
2556 auto TryConsumePureSpecifier = [&] (bool AllowDefinition) {
2557 if (Tok.isNot(tok::equal))
2560 auto &Zero = NextToken();
2561 SmallString<8> Buffer;
2562 if (Zero.isNot(tok::numeric_constant) || Zero.getLength() != 1 ||
2563 PP.getSpelling(Zero, Buffer) != "0")
2566 auto &After = GetLookAheadToken(2);
2567 if (!After.isOneOf(tok::semi, tok::comma) &&
2568 !(AllowDefinition &&
2569 After.isOneOf(tok::l_brace, tok::colon, tok::kw_try)))
2572 EqualLoc = ConsumeToken();
2573 PureSpecLoc = ConsumeToken();
2577 SmallVector<Decl *, 8> DeclsInGroup;
2578 ExprResult BitfieldSize;
2579 bool ExpectSemi = true;
2581 // Parse the first declarator.
2582 if (ParseCXXMemberDeclaratorBeforeInitializer(
2583 DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) {
2584 TryConsumeToken(tok::semi);
2588 // Check for a member function definition.
2589 if (BitfieldSize.isUnset()) {
2590 // MSVC permits pure specifier on inline functions defined at class scope.
2591 // Hence check for =0 before checking for function definition.
2592 if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction())
2593 TryConsumePureSpecifier(/*AllowDefinition*/ true);
2595 FunctionDefinitionKind DefinitionKind = FDK_Declaration;
2596 // function-definition:
2598 // In C++11, a non-function declarator followed by an open brace is a
2599 // braced-init-list for an in-class member initialization, not an
2600 // erroneous function definition.
2601 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
2602 DefinitionKind = FDK_Definition;
2603 } else if (DeclaratorInfo.isFunctionDeclarator()) {
2604 if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) {
2605 DefinitionKind = FDK_Definition;
2606 } else if (Tok.is(tok::equal)) {
2607 const Token &KW = NextToken();
2608 if (KW.is(tok::kw_default))
2609 DefinitionKind = FDK_Defaulted;
2610 else if (KW.is(tok::kw_delete))
2611 DefinitionKind = FDK_Deleted;
2614 DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind);
2616 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2617 // to a friend declaration, that declaration shall be a definition.
2618 if (DeclaratorInfo.isFunctionDeclarator() &&
2619 DefinitionKind != FDK_Definition && DS.isFriendSpecified()) {
2620 // Diagnose attributes that appear before decl specifier:
2621 // [[]] friend int foo();
2622 ProhibitAttributes(FnAttrs);
2625 if (DefinitionKind != FDK_Declaration) {
2626 if (!DeclaratorInfo.isFunctionDeclarator()) {
2627 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
2629 SkipUntil(tok::r_brace);
2631 // Consume the optional ';'
2632 TryConsumeToken(tok::semi);
2637 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
2638 Diag(DeclaratorInfo.getIdentifierLoc(),
2639 diag::err_function_declared_typedef);
2641 // Recover by treating the 'typedef' as spurious.
2642 DS.ClearStorageClassSpecs();
2646 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
2650 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2651 CommonLateParsedAttrs[i]->addDecl(FunDecl);
2653 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2654 LateParsedAttrs[i]->addDecl(FunDecl);
2657 LateParsedAttrs.clear();
2659 // Consume the ';' - it's optional unless we have a delete or default
2660 if (Tok.is(tok::semi))
2661 ConsumeExtraSemi(AfterMemberFunctionDefinition);
2663 return DeclGroupPtrTy::make(DeclGroupRef(FunDecl));
2667 // member-declarator-list:
2668 // member-declarator
2669 // member-declarator-list ',' member-declarator
2672 InClassInitStyle HasInClassInit = ICIS_NoInit;
2673 bool HasStaticInitializer = false;
2674 if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
2675 if (BitfieldSize.get()) {
2676 Diag(Tok, diag::err_bitfield_member_init);
2677 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2678 } else if (DeclaratorInfo.isDeclarationOfFunction()) {
2679 // It's a pure-specifier.
2680 if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false))
2681 // Parse it as an expression so that Sema can diagnose it.
2682 HasStaticInitializer = true;
2683 } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2684 DeclSpec::SCS_static &&
2685 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2686 DeclSpec::SCS_typedef &&
2687 !DS.isFriendSpecified()) {
2688 // It's a default member initializer.
2689 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2691 HasStaticInitializer = true;
2695 // NOTE: If Sema is the Action module and declarator is an instance field,
2696 // this call will *not* return the created decl; It will return null.
2697 // See Sema::ActOnCXXMemberDeclarator for details.
2699 NamedDecl *ThisDecl = nullptr;
2700 if (DS.isFriendSpecified()) {
2701 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2702 // to a friend declaration, that declaration shall be a definition.
2704 // Diagnose attributes that appear in a friend member function declarator:
2705 // friend int foo [[]] ();
2706 SmallVector<SourceRange, 4> Ranges;
2707 DeclaratorInfo.getCXX11AttributeRanges(Ranges);
2708 for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
2709 E = Ranges.end(); I != E; ++I)
2710 Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I;
2712 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2715 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2719 VS, HasInClassInit);
2721 if (VarTemplateDecl *VT =
2722 ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : nullptr)
2723 // Re-direct this decl to refer to the templated decl so that we can
2725 ThisDecl = VT->getTemplatedDecl();
2727 if (ThisDecl && AccessAttrs)
2728 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs);
2731 // Error recovery might have converted a non-static member into a static
2733 if (HasInClassInit != ICIS_NoInit &&
2734 DeclaratorInfo.getDeclSpec().getStorageClassSpec() ==
2735 DeclSpec::SCS_static) {
2736 HasInClassInit = ICIS_NoInit;
2737 HasStaticInitializer = true;
2740 if (ThisDecl && PureSpecLoc.isValid())
2741 Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc);
2743 // Handle the initializer.
2744 if (HasInClassInit != ICIS_NoInit) {
2745 // The initializer was deferred; parse it and cache the tokens.
2746 Diag(Tok, getLangOpts().CPlusPlus11
2747 ? diag::warn_cxx98_compat_nonstatic_member_init
2748 : diag::ext_nonstatic_member_init);
2750 if (DeclaratorInfo.isArrayOfUnknownBound()) {
2751 // C++11 [dcl.array]p3: An array bound may also be omitted when the
2752 // declarator is followed by an initializer.
2754 // A brace-or-equal-initializer for a member-declarator is not an
2755 // initializer in the grammar, so this is ill-formed.
2756 Diag(Tok, diag::err_incomplete_array_member_init);
2757 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2759 // Avoid later warnings about a class member of incomplete type.
2761 ThisDecl->setInvalidDecl();
2763 ParseCXXNonStaticMemberInitializer(ThisDecl);
2764 } else if (HasStaticInitializer) {
2765 // Normal initializer.
2766 ExprResult Init = ParseCXXMemberInitializer(
2767 ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2769 if (Init.isInvalid())
2770 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2772 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid());
2773 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
2775 Actions.ActOnUninitializedDecl(ThisDecl);
2778 if (!ThisDecl->isInvalidDecl()) {
2779 // Set the Decl for any late parsed attributes
2780 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
2781 CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2783 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
2784 LateParsedAttrs[i]->addDecl(ThisDecl);
2786 Actions.FinalizeDeclaration(ThisDecl);
2787 DeclsInGroup.push_back(ThisDecl);
2789 if (DeclaratorInfo.isFunctionDeclarator() &&
2790 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2791 DeclSpec::SCS_typedef)
2792 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2794 LateParsedAttrs.clear();
2796 DeclaratorInfo.complete(ThisDecl);
2798 // If we don't have a comma, it is either the end of the list (a ';')
2799 // or an error, bail out.
2800 SourceLocation CommaLoc;
2801 if (!TryConsumeToken(tok::comma, CommaLoc))
2804 if (Tok.isAtStartOfLine() &&
2805 !MightBeDeclarator(Declarator::MemberContext)) {
2806 // This comma was followed by a line-break and something which can't be
2807 // the start of a declarator. The comma was probably a typo for a
2809 Diag(CommaLoc, diag::err_expected_semi_declaration)
2810 << FixItHint::CreateReplacement(CommaLoc, ";");
2815 // Parse the next declarator.
2816 DeclaratorInfo.clear();
2818 BitfieldSize = ExprResult(/*Invalid=*/false);
2819 EqualLoc = PureSpecLoc = SourceLocation();
2820 DeclaratorInfo.setCommaLoc(CommaLoc);
2822 // GNU attributes are allowed before the second and subsequent declarator.
2823 MaybeParseGNUAttributes(DeclaratorInfo);
2825 if (ParseCXXMemberDeclaratorBeforeInitializer(
2826 DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs))
2831 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2832 // Skip to end of block or statement.
2833 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2834 // If we stopped at a ';', eat it.
2835 TryConsumeToken(tok::semi);
2839 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2842 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer.
2843 /// Also detect and reject any attempted defaulted/deleted function definition.
2844 /// The location of the '=', if any, will be placed in EqualLoc.
2846 /// This does not check for a pure-specifier; that's handled elsewhere.
2848 /// brace-or-equal-initializer:
2849 /// '=' initializer-expression
2850 /// braced-init-list
2852 /// initializer-clause:
2853 /// assignment-expression
2854 /// braced-init-list
2856 /// defaulted/deleted function-definition:
2860 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2861 /// be a constant-expression.
2862 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2863 SourceLocation &EqualLoc) {
2864 assert(Tok.isOneOf(tok::equal, tok::l_brace)
2865 && "Data member initializer not starting with '=' or '{'");
2867 EnterExpressionEvaluationContext Context(Actions,
2868 Sema::PotentiallyEvaluated,
2870 if (TryConsumeToken(tok::equal, EqualLoc)) {
2871 if (Tok.is(tok::kw_delete)) {
2872 // In principle, an initializer of '= delete p;' is legal, but it will
2873 // never type-check. It's better to diagnose it as an ill-formed expression
2874 // than as an ill-formed deleted non-function member.
2875 // An initializer of '= delete p, foo' will never be parsed, because
2876 // a top-level comma always ends the initializer expression.
2877 const Token &Next = NextToken();
2878 if (IsFunction || Next.isOneOf(tok::semi, tok::comma, tok::eof)) {
2880 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2883 Diag(ConsumeToken(), diag::err_deleted_non_function);
2886 } else if (Tok.is(tok::kw_default)) {
2888 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2891 Diag(ConsumeToken(), diag::err_default_special_members);
2895 if (const auto *PD = dyn_cast_or_null<MSPropertyDecl>(D)) {
2896 Diag(Tok, diag::err_ms_property_initializer) << PD;
2899 return ParseInitializer();
2902 void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc,
2903 SourceLocation AttrFixitLoc,
2904 unsigned TagType, Decl *TagDecl) {
2905 // Skip the optional 'final' keyword.
2906 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2907 assert(isCXX11FinalKeyword() && "not a class definition");
2910 // Diagnose any C++11 attributes after 'final' keyword.
2911 // We deliberately discard these attributes.
2912 ParsedAttributesWithRange Attrs(AttrFactory);
2913 CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
2915 // This can only happen if we had malformed misplaced attributes;
2916 // we only get called if there is a colon or left-brace after the
2918 if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace))
2922 // Skip the base clauses. This requires actually parsing them, because
2923 // otherwise we can't be sure where they end (a left brace may appear
2924 // within a template argument).
2925 if (Tok.is(tok::colon)) {
2926 // Enter the scope of the class so that we can correctly parse its bases.
2927 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2928 ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true,
2929 TagType == DeclSpec::TST_interface);
2931 Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl);
2933 // Parse the bases but don't attach them to the class.
2934 ParseBaseClause(nullptr);
2936 Actions.ActOnTagFinishSkippedDefinition(OldContext);
2938 if (!Tok.is(tok::l_brace)) {
2939 Diag(PP.getLocForEndOfToken(PrevTokLocation),
2940 diag::err_expected_lbrace_after_base_specifiers);
2946 assert(Tok.is(tok::l_brace));
2947 BalancedDelimiterTracker T(*this, tok::l_brace);
2951 // Parse and discard any trailing attributes.
2952 ParsedAttributes Attrs(AttrFactory);
2953 if (Tok.is(tok::kw___attribute))
2954 MaybeParseGNUAttributes(Attrs);
2957 Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas(
2958 AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs,
2959 DeclSpec::TST TagType, Decl *TagDecl) {
2960 if (getLangOpts().MicrosoftExt &&
2961 Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
2962 ParseMicrosoftIfExistsClassDeclaration(TagType, AS);
2966 // Check for extraneous top-level semicolon.
2967 if (Tok.is(tok::semi)) {
2968 ConsumeExtraSemi(InsideStruct, TagType);
2972 if (Tok.is(tok::annot_pragma_vis)) {
2973 HandlePragmaVisibility();
2977 if (Tok.is(tok::annot_pragma_pack)) {
2982 if (Tok.is(tok::annot_pragma_align)) {
2983 HandlePragmaAlign();
2987 if (Tok.is(tok::annot_pragma_ms_pointers_to_members)) {
2988 HandlePragmaMSPointersToMembers();
2992 if (Tok.is(tok::annot_pragma_ms_pragma)) {
2993 HandlePragmaMSPragma();
2997 if (Tok.is(tok::annot_pragma_ms_vtordisp)) {
2998 HandlePragmaMSVtorDisp();
3002 // If we see a namespace here, a close brace was missing somewhere.
3003 if (Tok.is(tok::kw_namespace)) {
3004 DiagnoseUnexpectedNamespace(cast<NamedDecl>(TagDecl));
3008 AccessSpecifier NewAS = getAccessSpecifierIfPresent();
3009 if (NewAS != AS_none) {
3010 // Current token is a C++ access specifier.
3012 SourceLocation ASLoc = Tok.getLocation();
3013 unsigned TokLength = Tok.getLength();
3015 AccessAttrs.clear();
3016 MaybeParseGNUAttributes(AccessAttrs);
3018 SourceLocation EndLoc;
3019 if (TryConsumeToken(tok::colon, EndLoc)) {
3020 } else if (TryConsumeToken(tok::semi, EndLoc)) {
3021 Diag(EndLoc, diag::err_expected)
3022 << tok::colon << FixItHint::CreateReplacement(EndLoc, ":");
3024 EndLoc = ASLoc.getLocWithOffset(TokLength);
3025 Diag(EndLoc, diag::err_expected)
3026 << tok::colon << FixItHint::CreateInsertion(EndLoc, ":");
3029 // The Microsoft extension __interface does not permit non-public
3030 // access specifiers.
3031 if (TagType == DeclSpec::TST_interface && AS != AS_public) {
3032 Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected);
3035 if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc,
3036 AccessAttrs.getList())) {
3037 // found another attribute than only annotations
3038 AccessAttrs.clear();
3044 if (Tok.is(tok::annot_pragma_openmp))
3045 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, AccessAttrs, TagType,
3048 // Parse all the comma separated declarators.
3049 return ParseCXXClassMemberDeclaration(AS, AccessAttrs.getList());
3052 /// ParseCXXMemberSpecification - Parse the class definition.
3054 /// member-specification:
3055 /// member-declaration member-specification[opt]
3056 /// access-specifier ':' member-specification[opt]
3058 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
3059 SourceLocation AttrFixitLoc,
3060 ParsedAttributesWithRange &Attrs,
3061 unsigned TagType, Decl *TagDecl) {
3062 assert((TagType == DeclSpec::TST_struct ||
3063 TagType == DeclSpec::TST_interface ||
3064 TagType == DeclSpec::TST_union ||
3065 TagType == DeclSpec::TST_class) && "Invalid TagType!");
3067 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
3068 "parsing struct/union/class body");
3070 // Determine whether this is a non-nested class. Note that local
3071 // classes are *not* considered to be nested classes.
3072 bool NonNestedClass = true;
3073 if (!ClassStack.empty()) {
3074 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
3075 if (S->isClassScope()) {
3076 // We're inside a class scope, so this is a nested class.
3077 NonNestedClass = false;
3079 // The Microsoft extension __interface does not permit nested classes.
3080 if (getCurrentClass().IsInterface) {
3081 Diag(RecordLoc, diag::err_invalid_member_in_interface)
3083 << (isa<NamedDecl>(TagDecl)
3084 ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
3090 if ((S->getFlags() & Scope::FnScope))
3091 // If we're in a function or function template then this is a local
3092 // class rather than a nested class.
3097 // Enter a scope for the class.
3098 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
3100 // Note that we are parsing a new (potentially-nested) class definition.
3101 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
3102 TagType == DeclSpec::TST_interface);
3105 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
3107 SourceLocation FinalLoc;
3108 bool IsFinalSpelledSealed = false;
3110 // Parse the optional 'final' keyword.
3111 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
3112 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok);
3113 assert((Specifier == VirtSpecifiers::VS_Final ||
3114 Specifier == VirtSpecifiers::VS_GNU_Final ||
3115 Specifier == VirtSpecifiers::VS_Sealed) &&
3116 "not a class definition");
3117 FinalLoc = ConsumeToken();
3118 IsFinalSpelledSealed = Specifier == VirtSpecifiers::VS_Sealed;
3120 if (TagType == DeclSpec::TST_interface)
3121 Diag(FinalLoc, diag::err_override_control_interface)
3122 << VirtSpecifiers::getSpecifierName(Specifier);
3123 else if (Specifier == VirtSpecifiers::VS_Final)
3124 Diag(FinalLoc, getLangOpts().CPlusPlus11
3125 ? diag::warn_cxx98_compat_override_control_keyword
3126 : diag::ext_override_control_keyword)
3127 << VirtSpecifiers::getSpecifierName(Specifier);
3128 else if (Specifier == VirtSpecifiers::VS_Sealed)
3129 Diag(FinalLoc, diag::ext_ms_sealed_keyword);
3130 else if (Specifier == VirtSpecifiers::VS_GNU_Final)
3131 Diag(FinalLoc, diag::ext_warn_gnu_final);
3133 // Parse any C++11 attributes after 'final' keyword.
3134 // These attributes are not allowed to appear here,
3135 // and the only possible place for them to appertain
3136 // to the class would be between class-key and class-name.
3137 CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
3139 // ParseClassSpecifier() does only a superficial check for attributes before
3140 // deciding to call this method. For example, for
3141 // `class C final alignas ([l) {` it will decide that this looks like a
3142 // misplaced attribute since it sees `alignas '(' ')'`. But the actual
3143 // attribute parsing code will try to parse the '[' as a constexpr lambda
3144 // and consume enough tokens that the alignas parsing code will eat the
3145 // opening '{'. So bail out if the next token isn't one we expect.
3146 if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) {
3148 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3153 if (Tok.is(tok::colon)) {
3154 ParseBaseClause(TagDecl);
3155 if (!Tok.is(tok::l_brace)) {
3156 bool SuggestFixIt = false;
3157 SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation);
3158 if (Tok.isAtStartOfLine()) {
3159 switch (Tok.getKind()) {
3160 case tok::kw_private:
3161 case tok::kw_protected:
3162 case tok::kw_public:
3163 SuggestFixIt = NextToken().getKind() == tok::colon;
3165 case tok::kw_static_assert:
3168 // base-clause can have simple-template-id; 'template' can't be there
3169 case tok::kw_template:
3170 SuggestFixIt = true;
3172 case tok::identifier:
3173 SuggestFixIt = isConstructorDeclarator(true);
3176 SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false);
3180 DiagnosticBuilder LBraceDiag =
3181 Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers);
3183 LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {");
3184 // Try recovering from missing { after base-clause.
3186 Tok.setKind(tok::l_brace);
3189 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3195 assert(Tok.is(tok::l_brace));
3196 BalancedDelimiterTracker T(*this, tok::l_brace);
3200 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
3201 IsFinalSpelledSealed,
3202 T.getOpenLocation());
3204 // C++ 11p3: Members of a class defined with the keyword class are private
3205 // by default. Members of a class defined with the keywords struct or union
3206 // are public by default.
3207 AccessSpecifier CurAS;
3208 if (TagType == DeclSpec::TST_class)
3212 ParsedAttributesWithRange AccessAttrs(AttrFactory);
3215 // While we still have something to read, read the member-declarations.
3216 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
3217 Tok.isNot(tok::eof)) {
3218 // Each iteration of this loop reads one member-declaration.
3219 ParseCXXClassMemberDeclarationWithPragmas(
3220 CurAS, AccessAttrs, static_cast<DeclSpec::TST>(TagType), TagDecl);
3224 SkipUntil(tok::r_brace);
3227 // If attributes exist after class contents, parse them.
3228 ParsedAttributes attrs(AttrFactory);
3229 MaybeParseGNUAttributes(attrs);
3232 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
3233 T.getOpenLocation(),
3234 T.getCloseLocation(),
3237 // C++11 [class.mem]p2:
3238 // Within the class member-specification, the class is regarded as complete
3239 // within function bodies, default arguments, exception-specifications, and
3240 // brace-or-equal-initializers for non-static data members (including such
3241 // things in nested classes).
3242 if (TagDecl && NonNestedClass) {
3243 // We are not inside a nested class. This class and its nested classes
3244 // are complete and we can parse the delayed portions of method
3245 // declarations and the lexed inline method definitions, along with any
3246 // delayed attributes.
3247 SourceLocation SavedPrevTokLocation = PrevTokLocation;
3248 ParseLexedAttributes(getCurrentClass());
3249 ParseLexedMethodDeclarations(getCurrentClass());
3251 // We've finished with all pending member declarations.
3252 Actions.ActOnFinishCXXMemberDecls();
3254 ParseLexedMemberInitializers(getCurrentClass());
3255 ParseLexedMethodDefs(getCurrentClass());
3256 PrevTokLocation = SavedPrevTokLocation;
3258 // We've finished parsing everything, including default argument
3260 Actions.ActOnFinishCXXNonNestedClass(TagDecl);
3264 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());
3266 // Leave the class scope.
3271 void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) {
3272 assert(Tok.is(tok::kw_namespace));
3274 // FIXME: Suggest where the close brace should have gone by looking
3275 // at indentation changes within the definition body.
3276 Diag(D->getLocation(),
3277 diag::err_missing_end_of_definition) << D;
3278 Diag(Tok.getLocation(),
3279 diag::note_missing_end_of_definition_before) << D;
3281 // Push '};' onto the token stream to recover.
3285 Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation));
3286 Tok.setKind(tok::semi);
3289 Tok.setKind(tok::r_brace);
3292 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
3293 /// which explicitly initializes the members or base classes of a
3294 /// class (C++ [class.base.init]). For example, the three initializers
3295 /// after the ':' in the Derived constructor below:
3299 /// class Derived : Base {
3303 /// Derived(float f) : Base(), x(17), f(f) { }
3307 /// [C++] ctor-initializer:
3308 /// ':' mem-initializer-list
3310 /// [C++] mem-initializer-list:
3311 /// mem-initializer ...[opt]
3312 /// mem-initializer ...[opt] , mem-initializer-list
3313 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
3314 assert(Tok.is(tok::colon) &&
3315 "Constructor initializer always starts with ':'");
3317 // Poison the SEH identifiers so they are flagged as illegal in constructor
3319 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
3320 SourceLocation ColonLoc = ConsumeToken();
3322 SmallVector<CXXCtorInitializer*, 4> MemInitializers;
3323 bool AnyErrors = false;
3326 if (Tok.is(tok::code_completion)) {
3327 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
3329 return cutOffParsing();
3332 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
3333 if (!MemInit.isInvalid())
3334 MemInitializers.push_back(MemInit.get());
3338 if (Tok.is(tok::comma))
3340 else if (Tok.is(tok::l_brace))
3342 // If the previous initializer was valid and the next token looks like a
3343 // base or member initializer, assume that we're just missing a comma.
3344 else if (!MemInit.isInvalid() &&
3345 Tok.isOneOf(tok::identifier, tok::coloncolon)) {
3346 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
3347 Diag(Loc, diag::err_ctor_init_missing_comma)
3348 << FixItHint::CreateInsertion(Loc, ", ");
3350 // Skip over garbage, until we get to '{'. Don't eat the '{'.
3351 if (!MemInit.isInvalid())
3352 Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace
3354 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
3359 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
3363 /// ParseMemInitializer - Parse a C++ member initializer, which is
3364 /// part of a constructor initializer that explicitly initializes one
3365 /// member or base class (C++ [class.base.init]). See
3366 /// ParseConstructorInitializer for an example.
3368 /// [C++] mem-initializer:
3369 /// mem-initializer-id '(' expression-list[opt] ')'
3370 /// [C++0x] mem-initializer-id braced-init-list
3372 /// [C++] mem-initializer-id:
3373 /// '::'[opt] nested-name-specifier[opt] class-name
3375 MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
3376 // parse '::'[opt] nested-name-specifier[opt]
3378 ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false);
3379 ParsedType TemplateTypeTy;
3380 if (Tok.is(tok::annot_template_id)) {
3381 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
3382 if (TemplateId->Kind == TNK_Type_template ||
3383 TemplateId->Kind == TNK_Dependent_template_name) {
3384 AnnotateTemplateIdTokenAsType();
3385 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
3386 TemplateTypeTy = getTypeAnnotation(Tok);
3389 // Uses of decltype will already have been converted to annot_decltype by
3390 // ParseOptionalCXXScopeSpecifier at this point.
3391 if (!TemplateTypeTy && Tok.isNot(tok::identifier)
3392 && Tok.isNot(tok::annot_decltype)) {
3393 Diag(Tok, diag::err_expected_member_or_base_name);
3397 IdentifierInfo *II = nullptr;
3398 DeclSpec DS(AttrFactory);
3399 SourceLocation IdLoc = Tok.getLocation();
3400 if (Tok.is(tok::annot_decltype)) {
3401 // Get the decltype expression, if there is one.
3402 ParseDecltypeSpecifier(DS);
3404 if (Tok.is(tok::identifier))
3405 // Get the identifier. This may be a member name or a class name,
3406 // but we'll let the semantic analysis determine which it is.
3407 II = Tok.getIdentifierInfo();
3413 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
3414 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
3416 ExprResult InitList = ParseBraceInitializer();
3417 if (InitList.isInvalid())
3420 SourceLocation EllipsisLoc;
3421 TryConsumeToken(tok::ellipsis, EllipsisLoc);
3423 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3424 TemplateTypeTy, DS, IdLoc,
3425 InitList.get(), EllipsisLoc);
3426 } else if(Tok.is(tok::l_paren)) {
3427 BalancedDelimiterTracker T(*this, tok::l_paren);
3430 // Parse the optional expression-list.
3431 ExprVector ArgExprs;
3432 CommaLocsTy CommaLocs;
3433 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
3434 SkipUntil(tok::r_paren, StopAtSemi);
3440 SourceLocation EllipsisLoc;
3441 TryConsumeToken(tok::ellipsis, EllipsisLoc);
3443 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3444 TemplateTypeTy, DS, IdLoc,
3445 T.getOpenLocation(), ArgExprs,
3446 T.getCloseLocation(), EllipsisLoc);
3449 if (getLangOpts().CPlusPlus11)
3450 return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace;
3452 return Diag(Tok, diag::err_expected) << tok::l_paren;
3455 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
3457 /// exception-specification:
3458 /// dynamic-exception-specification
3459 /// noexcept-specification
3461 /// noexcept-specification:
3463 /// 'noexcept' '(' constant-expression ')'
3464 ExceptionSpecificationType
3465 Parser::tryParseExceptionSpecification(bool Delayed,
3466 SourceRange &SpecificationRange,
3467 SmallVectorImpl<ParsedType> &DynamicExceptions,
3468 SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
3469 ExprResult &NoexceptExpr,
3470 CachedTokens *&ExceptionSpecTokens) {
3471 ExceptionSpecificationType Result = EST_None;
3472 ExceptionSpecTokens = nullptr;
3474 // Handle delayed parsing of exception-specifications.
3476 if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
3479 // Consume and cache the starting token.
3480 bool IsNoexcept = Tok.is(tok::kw_noexcept);
3481 Token StartTok = Tok;
3482 SpecificationRange = SourceRange(ConsumeToken());
3485 if (!Tok.is(tok::l_paren)) {
3486 // If this is a bare 'noexcept', we're done.
3488 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3489 NoexceptExpr = nullptr;
3490 return EST_BasicNoexcept;
3493 Diag(Tok, diag::err_expected_lparen_after) << "throw";
3494 return EST_DynamicNone;
3497 // Cache the tokens for the exception-specification.
3498 ExceptionSpecTokens = new CachedTokens;
3499 ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
3500 ExceptionSpecTokens->push_back(Tok); // '('
3501 SpecificationRange.setEnd(ConsumeParen()); // '('
3503 ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
3504 /*StopAtSemi=*/true,
3505 /*ConsumeFinalToken=*/true);
3506 SpecificationRange.setEnd(ExceptionSpecTokens->back().getLocation());
3508 return EST_Unparsed;
3511 // See if there's a dynamic specification.
3512 if (Tok.is(tok::kw_throw)) {
3513 Result = ParseDynamicExceptionSpecification(SpecificationRange,
3515 DynamicExceptionRanges);
3516 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
3517 "Produced different number of exception types and ranges.");
3520 // If there's no noexcept specification, we're done.
3521 if (Tok.isNot(tok::kw_noexcept))
3524 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3526 // If we already had a dynamic specification, parse the noexcept for,
3527 // recovery, but emit a diagnostic and don't store the results.
3528 SourceRange NoexceptRange;
3529 ExceptionSpecificationType NoexceptType = EST_None;
3531 SourceLocation KeywordLoc = ConsumeToken();
3532 if (Tok.is(tok::l_paren)) {
3533 // There is an argument.
3534 BalancedDelimiterTracker T(*this, tok::l_paren);
3536 NoexceptType = EST_ComputedNoexcept;
3537 NoexceptExpr = ParseConstantExpression();
3539 // The argument must be contextually convertible to bool. We use
3540 // CheckBooleanCondition for this purpose.
3541 // FIXME: Add a proper Sema entry point for this.
3542 if (!NoexceptExpr.isInvalid()) {
3544 Actions.CheckBooleanCondition(KeywordLoc, NoexceptExpr.get());
3545 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
3547 NoexceptType = EST_BasicNoexcept;
3550 // There is no argument.
3551 NoexceptType = EST_BasicNoexcept;
3552 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
3555 if (Result == EST_None) {
3556 SpecificationRange = NoexceptRange;
3557 Result = NoexceptType;
3559 // If there's a dynamic specification after a noexcept specification,
3560 // parse that and ignore the results.
3561 if (Tok.is(tok::kw_throw)) {
3562 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3563 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
3564 DynamicExceptionRanges);
3567 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3573 static void diagnoseDynamicExceptionSpecification(
3574 Parser &P, SourceRange Range, bool IsNoexcept) {
3575 if (P.getLangOpts().CPlusPlus11) {
3576 const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
3577 P.Diag(Range.getBegin(),
3578 P.getLangOpts().CPlusPlus1z && !IsNoexcept
3579 ? diag::ext_dynamic_exception_spec
3580 : diag::warn_exception_spec_deprecated)
3582 P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
3583 << Replacement << FixItHint::CreateReplacement(Range, Replacement);
3587 /// ParseDynamicExceptionSpecification - Parse a C++
3588 /// dynamic-exception-specification (C++ [except.spec]).
3590 /// dynamic-exception-specification:
3591 /// 'throw' '(' type-id-list [opt] ')'
3592 /// [MS] 'throw' '(' '...' ')'
3595 /// type-id ... [opt]
3596 /// type-id-list ',' type-id ... [opt]
3598 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
3599 SourceRange &SpecificationRange,
3600 SmallVectorImpl<ParsedType> &Exceptions,
3601 SmallVectorImpl<SourceRange> &Ranges) {
3602 assert(Tok.is(tok::kw_throw) && "expected throw");
3604 SpecificationRange.setBegin(ConsumeToken());
3605 BalancedDelimiterTracker T(*this, tok::l_paren);
3606 if (T.consumeOpen()) {
3607 Diag(Tok, diag::err_expected_lparen_after) << "throw";
3608 SpecificationRange.setEnd(SpecificationRange.getBegin());
3609 return EST_DynamicNone;
3612 // Parse throw(...), a Microsoft extension that means "this function
3613 // can throw anything".
3614 if (Tok.is(tok::ellipsis)) {
3615 SourceLocation EllipsisLoc = ConsumeToken();
3616 if (!getLangOpts().MicrosoftExt)
3617 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
3619 SpecificationRange.setEnd(T.getCloseLocation());
3620 diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
3624 // Parse the sequence of type-ids.
3626 while (Tok.isNot(tok::r_paren)) {
3627 TypeResult Res(ParseTypeName(&Range));
3629 if (Tok.is(tok::ellipsis)) {
3630 // C++0x [temp.variadic]p5:
3631 // - In a dynamic-exception-specification (15.4); the pattern is a
3633 SourceLocation Ellipsis = ConsumeToken();
3634 Range.setEnd(Ellipsis);
3635 if (!Res.isInvalid())
3636 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
3639 if (!Res.isInvalid()) {
3640 Exceptions.push_back(Res.get());
3641 Ranges.push_back(Range);
3644 if (!TryConsumeToken(tok::comma))
3649 SpecificationRange.setEnd(T.getCloseLocation());
3650 diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
3651 Exceptions.empty());
3652 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3655 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
3656 /// function declaration.
3657 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
3658 assert(Tok.is(tok::arrow) && "expected arrow");
3662 return ParseTypeName(&Range, Declarator::TrailingReturnContext);
3665 /// \brief We have just started parsing the definition of a new class,
3666 /// so push that class onto our stack of classes that is currently
3668 Sema::ParsingClassState
3669 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
3671 assert((NonNestedClass || !ClassStack.empty()) &&
3672 "Nested class without outer class");
3673 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
3674 return Actions.PushParsingClass();
3677 /// \brief Deallocate the given parsed class and all of its nested
3679 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
3680 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
3681 delete Class->LateParsedDeclarations[I];
3685 /// \brief Pop the top class of the stack of classes that are
3686 /// currently being parsed.
3688 /// This routine should be called when we have finished parsing the
3689 /// definition of a class, but have not yet popped the Scope
3690 /// associated with the class's definition.
3691 void Parser::PopParsingClass(Sema::ParsingClassState state) {
3692 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
3694 Actions.PopParsingClass(state);
3696 ParsingClass *Victim = ClassStack.top();
3698 if (Victim->TopLevelClass) {
3699 // Deallocate all of the nested classes of this class,
3700 // recursively: we don't need to keep any of this information.
3701 DeallocateParsedClasses(Victim);
3704 assert(!ClassStack.empty() && "Missing top-level class?");
3706 if (Victim->LateParsedDeclarations.empty()) {
3707 // The victim is a nested class, but we will not need to perform
3708 // any processing after the definition of this class since it has
3709 // no members whose handling was delayed. Therefore, we can just
3710 // remove this nested class.
3711 DeallocateParsedClasses(Victim);
3715 // This nested class has some members that will need to be processed
3716 // after the top-level class is completely defined. Therefore, add
3717 // it to the list of nested classes within its parent.
3718 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
3719 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
3720 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
3723 /// \brief Try to parse an 'identifier' which appears within an attribute-token.
3725 /// \return the parsed identifier on success, and 0 if the next token is not an
3726 /// attribute-token.
3728 /// C++11 [dcl.attr.grammar]p3:
3729 /// If a keyword or an alternative token that satisfies the syntactic
3730 /// requirements of an identifier is contained in an attribute-token,
3731 /// it is considered an identifier.
3732 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
3733 switch (Tok.getKind()) {
3735 // Identifiers and keywords have identifier info attached.
3736 if (!Tok.isAnnotation()) {
3737 if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
3738 Loc = ConsumeToken();
3744 case tok::ampamp: // 'and'
3745 case tok::pipe: // 'bitor'
3746 case tok::pipepipe: // 'or'
3747 case tok::caret: // 'xor'
3748 case tok::tilde: // 'compl'
3749 case tok::amp: // 'bitand'
3750 case tok::ampequal: // 'and_eq'
3751 case tok::pipeequal: // 'or_eq'
3752 case tok::caretequal: // 'xor_eq'
3753 case tok::exclaim: // 'not'
3754 case tok::exclaimequal: // 'not_eq'
3755 // Alternative tokens do not have identifier info, but their spelling
3756 // starts with an alphabetical character.
3757 SmallString<8> SpellingBuf;
3758 SourceLocation SpellingLoc =
3759 PP.getSourceManager().getSpellingLoc(Tok.getLocation());
3760 StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf);
3761 if (isLetter(Spelling[0])) {
3762 Loc = ConsumeToken();
3763 return &PP.getIdentifierTable().get(Spelling);
3769 static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
3770 IdentifierInfo *ScopeName) {
3771 switch (AttributeList::getKind(AttrName, ScopeName,
3772 AttributeList::AS_CXX11)) {
3773 case AttributeList::AT_CarriesDependency:
3774 case AttributeList::AT_Deprecated:
3775 case AttributeList::AT_FallThrough:
3776 case AttributeList::AT_CXX11NoReturn:
3778 case AttributeList::AT_WarnUnusedResult:
3779 return !ScopeName && AttrName->getName().equals("nodiscard");
3780 case AttributeList::AT_Unused:
3781 return !ScopeName && AttrName->getName().equals("maybe_unused");
3787 /// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause.
3789 /// [C++11] attribute-argument-clause:
3790 /// '(' balanced-token-seq ')'
3792 /// [C++11] balanced-token-seq:
3794 /// balanced-token-seq balanced-token
3796 /// [C++11] balanced-token:
3797 /// '(' balanced-token-seq ')'
3798 /// '[' balanced-token-seq ']'
3799 /// '{' balanced-token-seq '}'
3800 /// any token but '(', ')', '[', ']', '{', or '}'
3801 bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName,
3802 SourceLocation AttrNameLoc,
3803 ParsedAttributes &Attrs,
3804 SourceLocation *EndLoc,
3805 IdentifierInfo *ScopeName,
3806 SourceLocation ScopeLoc) {
3807 assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list");
3808 SourceLocation LParenLoc = Tok.getLocation();
3810 // If the attribute isn't known, we will not attempt to parse any
3812 if (!hasAttribute(AttrSyntax::CXX, ScopeName, AttrName,
3813 getTargetInfo(), getLangOpts())) {
3814 // Eat the left paren, then skip to the ending right paren.
3816 SkipUntil(tok::r_paren);
3820 if (ScopeName && ScopeName->getName() == "gnu")
3821 // GNU-scoped attributes have some special cases to handle GNU-specific
3823 ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
3824 ScopeLoc, AttributeList::AS_CXX11, nullptr);
3827 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
3828 ScopeName, ScopeLoc, AttributeList::AS_CXX11);
3830 const AttributeList *Attr = Attrs.getList();
3831 if (Attr && IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) {
3832 // If the attribute is a standard or built-in attribute and we are
3833 // parsing an argument list, we need to determine whether this attribute
3834 // was allowed to have an argument list (such as [[deprecated]]), and how
3835 // many arguments were parsed (so we can diagnose on [[deprecated()]]).
3836 if (Attr->getMaxArgs() && !NumArgs) {
3837 // The attribute was allowed to have arguments, but none were provided
3838 // even though the attribute parsed successfully. This is an error.
3839 Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName;
3840 Attr->setInvalid(true);
3841 } else if (!Attr->getMaxArgs()) {
3842 // The attribute parsed successfully, but was not allowed to have any
3843 // arguments. It doesn't matter whether any were provided -- the
3844 // presence of the argument list (even if empty) is diagnosed.
3845 Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments)
3847 << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc));
3848 Attr->setInvalid(true);
3855 /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier.
3857 /// [C++11] attribute-specifier:
3858 /// '[' '[' attribute-list ']' ']'
3859 /// alignment-specifier
3861 /// [C++11] attribute-list:
3863 /// attribute-list ',' attribute[opt]
3865 /// attribute-list ',' attribute '...'
3867 /// [C++11] attribute:
3868 /// attribute-token attribute-argument-clause[opt]
3870 /// [C++11] attribute-token:
3872 /// attribute-scoped-token
3874 /// [C++11] attribute-scoped-token:
3875 /// attribute-namespace '::' identifier
3877 /// [C++11] attribute-namespace:
3879 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
3880 SourceLocation *endLoc) {
3881 if (Tok.is(tok::kw_alignas)) {
3882 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
3883 ParseAlignmentSpecifier(attrs, endLoc);
3887 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
3888 && "Not a C++11 attribute list");
3890 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
3895 SourceLocation CommonScopeLoc;
3896 IdentifierInfo *CommonScopeName = nullptr;
3897 if (Tok.is(tok::kw_using)) {
3898 Diag(Tok.getLocation(), getLangOpts().CPlusPlus1z
3899 ? diag::warn_cxx14_compat_using_attribute_ns
3900 : diag::ext_using_attribute_ns);
3903 CommonScopeName = TryParseCXX11AttributeIdentifier(CommonScopeLoc);
3904 if (!CommonScopeName) {
3905 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
3906 SkipUntil(tok::r_square, tok::colon, StopBeforeMatch);
3908 if (!TryConsumeToken(tok::colon) && CommonScopeName)
3909 Diag(Tok.getLocation(), diag::err_expected) << tok::colon;
3912 llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
3914 while (Tok.isNot(tok::r_square)) {
3915 // attribute not present
3916 if (TryConsumeToken(tok::comma))
3919 SourceLocation ScopeLoc, AttrLoc;
3920 IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr;
3922 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3924 // Break out to the "expected ']'" diagnostic.
3928 if (TryConsumeToken(tok::coloncolon)) {
3929 ScopeName = AttrName;
3932 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3934 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
3935 SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch);
3940 if (CommonScopeName) {
3942 Diag(ScopeLoc, diag::err_using_attribute_ns_conflict)
3943 << SourceRange(CommonScopeLoc);
3945 ScopeName = CommonScopeName;
3946 ScopeLoc = CommonScopeLoc;
3950 bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName);
3951 bool AttrParsed = false;
3954 !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second)
3955 Diag(AttrLoc, diag::err_cxx11_attribute_repeated)
3956 << AttrName << SourceRange(SeenAttrs[AttrName]);
3958 // Parse attribute arguments
3959 if (Tok.is(tok::l_paren))
3960 AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, attrs, endLoc,
3961 ScopeName, ScopeLoc);
3964 attrs.addNew(AttrName,
3965 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc,
3967 ScopeName, ScopeLoc, nullptr, 0, AttributeList::AS_CXX11);
3969 if (TryConsumeToken(tok::ellipsis))
3970 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
3971 << AttrName->getName();
3974 if (ExpectAndConsume(tok::r_square))
3975 SkipUntil(tok::r_square);
3977 *endLoc = Tok.getLocation();
3978 if (ExpectAndConsume(tok::r_square))
3979 SkipUntil(tok::r_square);
3982 /// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq.
3984 /// attribute-specifier-seq:
3985 /// attribute-specifier-seq[opt] attribute-specifier
3986 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
3987 SourceLocation *endLoc) {
3988 assert(getLangOpts().CPlusPlus11);
3990 SourceLocation StartLoc = Tok.getLocation(), Loc;
3995 ParseCXX11AttributeSpecifier(attrs, endLoc);
3996 } while (isCXX11AttributeSpecifier());
3998 attrs.Range = SourceRange(StartLoc, *endLoc);
4001 void Parser::DiagnoseAndSkipCXX11Attributes() {
4002 // Start and end location of an attribute or an attribute list.
4003 SourceLocation StartLoc = Tok.getLocation();
4004 SourceLocation EndLoc = SkipCXX11Attributes();
4006 if (EndLoc.isValid()) {
4007 SourceRange Range(StartLoc, EndLoc);
4008 Diag(StartLoc, diag::err_attributes_not_allowed)
4013 SourceLocation Parser::SkipCXX11Attributes() {
4014 SourceLocation EndLoc;
4016 if (!isCXX11AttributeSpecifier())
4020 if (Tok.is(tok::l_square)) {
4021 BalancedDelimiterTracker T(*this, tok::l_square);
4024 EndLoc = T.getCloseLocation();
4026 assert(Tok.is(tok::kw_alignas) && "not an attribute specifier");
4028 BalancedDelimiterTracker T(*this, tok::l_paren);
4029 if (!T.consumeOpen())
4031 EndLoc = T.getCloseLocation();
4033 } while (isCXX11AttributeSpecifier());
4038 /// Parse uuid() attribute when it appears in a [] Microsoft attribute.
4039 void Parser::ParseMicrosoftUuidAttributeArgs(ParsedAttributes &Attrs) {
4040 assert(Tok.is(tok::identifier) && "Not a Microsoft attribute list");
4041 IdentifierInfo *UuidIdent = Tok.getIdentifierInfo();
4042 assert(UuidIdent->getName() == "uuid" && "Not a Microsoft attribute list");
4044 SourceLocation UuidLoc = Tok.getLocation();
4047 // Ignore the left paren location for now.
4048 BalancedDelimiterTracker T(*this, tok::l_paren);
4049 if (T.consumeOpen()) {
4050 Diag(Tok, diag::err_expected) << tok::l_paren;
4054 ArgsVector ArgExprs;
4055 if (Tok.is(tok::string_literal)) {
4056 // Easy case: uuid("...") -- quoted string.
4057 ExprResult StringResult = ParseStringLiteralExpression();
4058 if (StringResult.isInvalid())
4060 ArgExprs.push_back(StringResult.get());
4062 // something like uuid({000000A0-0000-0000-C000-000000000049}) -- no
4063 // quotes in the parens. Just append the spelling of all tokens encountered
4064 // until the closing paren.
4066 SmallString<42> StrBuffer; // 2 "", 36 bytes UUID, 2 optional {}, 1 nul
4069 // Since none of C++'s keywords match [a-f]+, accepting just tok::l_brace,
4070 // tok::r_brace, tok::minus, tok::identifier (think C000) and
4071 // tok::numeric_constant (0000) should be enough. But the spelling of the
4072 // uuid argument is checked later anyways, so there's no harm in accepting
4073 // almost anything here.
4074 // cl is very strict about whitespace in this form and errors out if any
4075 // is present, so check the space flags on the tokens.
4076 SourceLocation StartLoc = Tok.getLocation();
4077 while (Tok.isNot(tok::r_paren)) {
4078 if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4079 Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4080 SkipUntil(tok::r_paren, StopAtSemi);
4083 SmallString<16> SpellingBuffer;
4084 SpellingBuffer.resize(Tok.getLength() + 1);
4085 bool Invalid = false;
4086 StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
4088 SkipUntil(tok::r_paren, StopAtSemi);
4091 StrBuffer += TokSpelling;
4096 if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4097 Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4102 // Pretend the user wrote the appropriate string literal here.
4103 // ActOnStringLiteral() copies the string data into the literal, so it's
4104 // ok that the Token points to StrBuffer.
4106 Toks[0].startToken();
4107 Toks[0].setKind(tok::string_literal);
4108 Toks[0].setLocation(StartLoc);
4109 Toks[0].setLiteralData(StrBuffer.data());
4110 Toks[0].setLength(StrBuffer.size());
4111 StringLiteral *UuidString =
4112 cast<StringLiteral>(Actions.ActOnStringLiteral(Toks, nullptr).get());
4113 ArgExprs.push_back(UuidString);
4116 if (!T.consumeClose()) {
4117 // FIXME: Warn that this syntax is deprecated, with a Fix-It suggesting
4118 // using __declspec(uuid()) instead.
4119 Attrs.addNew(UuidIdent, SourceRange(UuidLoc, T.getCloseLocation()), nullptr,
4120 SourceLocation(), ArgExprs.data(), ArgExprs.size(),
4121 AttributeList::AS_Microsoft);
4125 /// ParseMicrosoftAttributes - Parse Microsoft attributes [Attr]
4127 /// [MS] ms-attribute:
4128 /// '[' token-seq ']'
4130 /// [MS] ms-attribute-seq:
4131 /// ms-attribute[opt]
4132 /// ms-attribute ms-attribute-seq
4133 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
4134 SourceLocation *endLoc) {
4135 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
4138 // FIXME: If this is actually a C++11 attribute, parse it as one.
4139 BalancedDelimiterTracker T(*this, tok::l_square);
4142 // Skip most ms attributes except for a whitelist.
4144 SkipUntil(tok::r_square, tok::identifier, StopAtSemi | StopBeforeMatch);
4145 if (Tok.isNot(tok::identifier)) // ']', but also eof
4147 if (Tok.getIdentifierInfo()->getName() == "uuid")
4148 ParseMicrosoftUuidAttributeArgs(attrs);
4155 *endLoc = T.getCloseLocation();
4156 } while (Tok.is(tok::l_square));
4159 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
4160 AccessSpecifier& CurAS) {
4161 IfExistsCondition Result;
4162 if (ParseMicrosoftIfExistsCondition(Result))
4165 BalancedDelimiterTracker Braces(*this, tok::l_brace);
4166 if (Braces.consumeOpen()) {
4167 Diag(Tok, diag::err_expected) << tok::l_brace;
4171 switch (Result.Behavior) {
4173 // Parse the declarations below.
4177 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
4178 << Result.IsIfExists;
4179 // Fall through to skip.
4186 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
4187 // __if_exists, __if_not_exists can nest.
4188 if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
4189 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
4193 // Check for extraneous top-level semicolon.
4194 if (Tok.is(tok::semi)) {
4195 ConsumeExtraSemi(InsideStruct, TagType);
4199 AccessSpecifier AS = getAccessSpecifierIfPresent();
4200 if (AS != AS_none) {
4201 // Current token is a C++ access specifier.
4203 SourceLocation ASLoc = Tok.getLocation();
4205 if (Tok.is(tok::colon))
4206 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
4208 Diag(Tok, diag::err_expected) << tok::colon;
4213 // Parse all the comma separated declarators.
4214 ParseCXXClassMemberDeclaration(CurAS, nullptr);
4217 Braces.consumeClose();