ParseDeclCXX.cpp revision 0f4be74ff0273e505d383f89174ef539828424ed 
1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements the C++ Declaration portions of the Parser interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/OperatorKinds.h"
15#include "clang/Parse/Parser.h"
16#include "clang/Parse/ParseDiagnostic.h"
17#include "clang/Sema/DeclSpec.h"
18#include "clang/Sema/Scope.h"
19#include "clang/Sema/ParsedTemplate.h"
20#include "clang/Sema/PrettyDeclStackTrace.h"
21#include "RAIIObjectsForParser.h"
22using namespace clang;
23
24/// ParseNamespace - We know that the current token is a namespace keyword. This
25/// may either be a top level namespace or a block-level namespace alias. If
26/// there was an inline keyword, it has already been parsed.
27///
28///       namespace-definition: [C++ 7.3: basic.namespace]
29///         named-namespace-definition
30///         unnamed-namespace-definition
31///
32///       unnamed-namespace-definition:
33///         'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
34///
35///       named-namespace-definition:
36///         original-namespace-definition
37///         extension-namespace-definition
38///
39///       original-namespace-definition:
40///         'inline'[opt] 'namespace' identifier attributes[opt]
41///             '{' namespace-body '}'
42///
43///       extension-namespace-definition:
44///         'inline'[opt] 'namespace' original-namespace-name
45///             '{' namespace-body '}'
46///
47///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
48///         'namespace' identifier '=' qualified-namespace-specifier ';'
49///
50Decl *Parser::ParseNamespace(unsigned Context,
51                             SourceLocation &DeclEnd,
52                             SourceLocation InlineLoc) {
53  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
54  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
55
56  if (Tok.is(tok::code_completion)) {
57    Actions.CodeCompleteNamespaceDecl(getCurScope());
58    ConsumeCodeCompletionToken();
59  }
60
61  SourceLocation IdentLoc;
62  IdentifierInfo *Ident = 0;
63
64  Token attrTok;
65
66  if (Tok.is(tok::identifier)) {
67    Ident = Tok.getIdentifierInfo();
68    IdentLoc = ConsumeToken();  // eat the identifier.
69  }
70
71  // Read label attributes, if present.
72  ParsedAttributes attrs(AttrFactory);
73  if (Tok.is(tok::kw___attribute)) {
74    attrTok = Tok;
75    ParseGNUAttributes(attrs);
76  }
77
78  if (Tok.is(tok::equal)) {
79    if (!attrs.empty())
80      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
81    if (InlineLoc.isValid())
82      Diag(InlineLoc, diag::err_inline_namespace_alias)
83          << FixItHint::CreateRemoval(InlineLoc);
84
85    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
86  }
87
88  if (Tok.isNot(tok::l_brace)) {
89    Diag(Tok, Ident ? diag::err_expected_lbrace :
90         diag::err_expected_ident_lbrace);
91    return 0;
92  }
93
94  SourceLocation LBrace = ConsumeBrace();
95
96  if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
97      getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
98      getCurScope()->getFnParent()) {
99    Diag(LBrace, diag::err_namespace_nonnamespace_scope);
100    SkipUntil(tok::r_brace, false);
101    return 0;
102  }
103
104  // If we're still good, complain about inline namespaces in non-C++0x now.
105  if (!getLang().CPlusPlus0x && InlineLoc.isValid())
106    Diag(InlineLoc, diag::ext_inline_namespace);
107
108  // Enter a scope for the namespace.
109  ParseScope NamespaceScope(this, Scope::DeclScope);
110
111  Decl *NamespcDecl =
112    Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
113                                   IdentLoc, Ident, LBrace, attrs.getList());
114
115  PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
116                                      "parsing namespace");
117
118  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
119    ParsedAttributesWithRange attrs(AttrFactory);
120    MaybeParseCXX0XAttributes(attrs);
121    MaybeParseMicrosoftAttributes(attrs);
122    ParseExternalDeclaration(attrs);
123  }
124
125  // Leave the namespace scope.
126  NamespaceScope.Exit();
127
128  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
129  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
130
131  DeclEnd = RBraceLoc;
132  return NamespcDecl;
133}
134
135/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
136/// alias definition.
137///
138Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
139                                  SourceLocation AliasLoc,
140                                  IdentifierInfo *Alias,
141                                  SourceLocation &DeclEnd) {
142  assert(Tok.is(tok::equal) && "Not equal token");
143
144  ConsumeToken(); // eat the '='.
145
146  if (Tok.is(tok::code_completion)) {
147    Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
148    ConsumeCodeCompletionToken();
149  }
150
151  CXXScopeSpec SS;
152  // Parse (optional) nested-name-specifier.
153  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
154
155  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
156    Diag(Tok, diag::err_expected_namespace_name);
157    // Skip to end of the definition and eat the ';'.
158    SkipUntil(tok::semi);
159    return 0;
160  }
161
162  // Parse identifier.
163  IdentifierInfo *Ident = Tok.getIdentifierInfo();
164  SourceLocation IdentLoc = ConsumeToken();
165
166  // Eat the ';'.
167  DeclEnd = Tok.getLocation();
168  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
169                   "", tok::semi);
170
171  return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
172                                        SS, IdentLoc, Ident);
173}
174
175/// ParseLinkage - We know that the current token is a string_literal
176/// and just before that, that extern was seen.
177///
178///       linkage-specification: [C++ 7.5p2: dcl.link]
179///         'extern' string-literal '{' declaration-seq[opt] '}'
180///         'extern' string-literal declaration
181///
182Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
183  assert(Tok.is(tok::string_literal) && "Not a string literal!");
184  llvm::SmallString<8> LangBuffer;
185  bool Invalid = false;
186  llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
187  if (Invalid)
188    return 0;
189
190  SourceLocation Loc = ConsumeStringToken();
191
192  ParseScope LinkageScope(this, Scope::DeclScope);
193  Decl *LinkageSpec
194    = Actions.ActOnStartLinkageSpecification(getCurScope(),
195                                             DS.getSourceRange().getBegin(),
196                                             Loc, Lang,
197                                      Tok.is(tok::l_brace) ? Tok.getLocation()
198                                                           : SourceLocation());
199
200  ParsedAttributesWithRange attrs(AttrFactory);
201  MaybeParseCXX0XAttributes(attrs);
202  MaybeParseMicrosoftAttributes(attrs);
203
204  if (Tok.isNot(tok::l_brace)) {
205    // Reset the source range in DS, as the leading "extern"
206    // does not really belong to the inner declaration ...
207    DS.SetRangeStart(SourceLocation());
208    DS.SetRangeEnd(SourceLocation());
209    // ... but anyway remember that such an "extern" was seen.
210    DS.setExternInLinkageSpec(true);
211    ParseExternalDeclaration(attrs, &DS);
212    return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
213                                                   SourceLocation());
214  }
215
216  DS.abort();
217
218  ProhibitAttributes(attrs);
219
220  SourceLocation LBrace = ConsumeBrace();
221  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
222    ParsedAttributesWithRange attrs(AttrFactory);
223    MaybeParseCXX0XAttributes(attrs);
224    MaybeParseMicrosoftAttributes(attrs);
225    ParseExternalDeclaration(attrs);
226  }
227
228  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
229  return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
230                                                 RBrace);
231}
232
233/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
234/// using-directive. Assumes that current token is 'using'.
235Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
236                                         const ParsedTemplateInfo &TemplateInfo,
237                                               SourceLocation &DeclEnd,
238                                             ParsedAttributesWithRange &attrs) {
239  assert(Tok.is(tok::kw_using) && "Not using token");
240
241  // Eat 'using'.
242  SourceLocation UsingLoc = ConsumeToken();
243
244  if (Tok.is(tok::code_completion)) {
245    Actions.CodeCompleteUsing(getCurScope());
246    ConsumeCodeCompletionToken();
247  }
248
249  // 'using namespace' means this is a using-directive.
250  if (Tok.is(tok::kw_namespace)) {
251    // Template parameters are always an error here.
252    if (TemplateInfo.Kind) {
253      SourceRange R = TemplateInfo.getSourceRange();
254      Diag(UsingLoc, diag::err_templated_using_directive)
255        << R << FixItHint::CreateRemoval(R);
256    }
257
258    return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
259  }
260
261  // Otherwise, it must be a using-declaration or an alias-declaration.
262
263  // Using declarations can't have attributes.
264  ProhibitAttributes(attrs);
265
266  return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd);
267}
268
269/// ParseUsingDirective - Parse C++ using-directive, assumes
270/// that current token is 'namespace' and 'using' was already parsed.
271///
272///       using-directive: [C++ 7.3.p4: namespace.udir]
273///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
274///                 namespace-name ;
275/// [GNU] using-directive:
276///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
277///                 namespace-name attributes[opt] ;
278///
279Decl *Parser::ParseUsingDirective(unsigned Context,
280                                  SourceLocation UsingLoc,
281                                  SourceLocation &DeclEnd,
282                                  ParsedAttributes &attrs) {
283  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
284
285  // Eat 'namespace'.
286  SourceLocation NamespcLoc = ConsumeToken();
287
288  if (Tok.is(tok::code_completion)) {
289    Actions.CodeCompleteUsingDirective(getCurScope());
290    ConsumeCodeCompletionToken();
291  }
292
293  CXXScopeSpec SS;
294  // Parse (optional) nested-name-specifier.
295  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
296
297  IdentifierInfo *NamespcName = 0;
298  SourceLocation IdentLoc = SourceLocation();
299
300  // Parse namespace-name.
301  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
302    Diag(Tok, diag::err_expected_namespace_name);
303    // If there was invalid namespace name, skip to end of decl, and eat ';'.
304    SkipUntil(tok::semi);
305    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
306    return 0;
307  }
308
309  // Parse identifier.
310  NamespcName = Tok.getIdentifierInfo();
311  IdentLoc = ConsumeToken();
312
313  // Parse (optional) attributes (most likely GNU strong-using extension).
314  bool GNUAttr = false;
315  if (Tok.is(tok::kw___attribute)) {
316    GNUAttr = true;
317    ParseGNUAttributes(attrs);
318  }
319
320  // Eat ';'.
321  DeclEnd = Tok.getLocation();
322  ExpectAndConsume(tok::semi,
323                   GNUAttr ? diag::err_expected_semi_after_attribute_list
324                           : diag::err_expected_semi_after_namespace_name,
325                   "", tok::semi);
326
327  return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
328                                     IdentLoc, NamespcName, attrs.getList());
329}
330
331/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
332/// Assumes that 'using' was already seen.
333///
334///     using-declaration: [C++ 7.3.p3: namespace.udecl]
335///       'using' 'typename'[opt] ::[opt] nested-name-specifier
336///               unqualified-id
337///       'using' :: unqualified-id
338///
339///     alias-declaration: C++0x [decl.typedef]p2
340///       'using' identifier = type-id ;
341///
342Decl *Parser::ParseUsingDeclaration(unsigned Context,
343                                    const ParsedTemplateInfo &TemplateInfo,
344                                    SourceLocation UsingLoc,
345                                    SourceLocation &DeclEnd,
346                                    AccessSpecifier AS) {
347  CXXScopeSpec SS;
348  SourceLocation TypenameLoc;
349  bool IsTypeName;
350
351  // Ignore optional 'typename'.
352  // FIXME: This is wrong; we should parse this as a typename-specifier.
353  if (Tok.is(tok::kw_typename)) {
354    TypenameLoc = Tok.getLocation();
355    ConsumeToken();
356    IsTypeName = true;
357  }
358  else
359    IsTypeName = false;
360
361  // Parse nested-name-specifier.
362  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
363
364  // Check nested-name specifier.
365  if (SS.isInvalid()) {
366    SkipUntil(tok::semi);
367    return 0;
368  }
369
370  // Parse the unqualified-id. We allow parsing of both constructor and
371  // destructor names and allow the action module to diagnose any semantic
372  // errors.
373  UnqualifiedId Name;
374  if (ParseUnqualifiedId(SS,
375                         /*EnteringContext=*/false,
376                         /*AllowDestructorName=*/true,
377                         /*AllowConstructorName=*/true,
378                         ParsedType(),
379                         Name)) {
380    SkipUntil(tok::semi);
381    return 0;
382  }
383
384  ParsedAttributes attrs(AttrFactory);
385
386  // Maybe this is an alias-declaration.
387  bool IsAliasDecl = Tok.is(tok::equal);
388  TypeResult TypeAlias;
389  if (IsAliasDecl) {
390    // TODO: Do we want to support attributes somewhere in an alias declaration?
391    // Can't follow GCC since it doesn't support them yet!
392    ConsumeToken();
393
394    if (!getLang().CPlusPlus0x)
395      Diag(Tok.getLocation(), diag::ext_alias_declaration);
396
397    // Name must be an identifier.
398    if (Name.getKind() != UnqualifiedId::IK_Identifier) {
399      Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
400      // No removal fixit: can't recover from this.
401      SkipUntil(tok::semi);
402      return 0;
403    } else if (IsTypeName)
404      Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
405        << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
406                             SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
407    else if (SS.isNotEmpty())
408      Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
409        << FixItHint::CreateRemoval(SS.getRange());
410
411    TypeAlias = ParseTypeName(0, Declarator::AliasDeclContext);
412  } else
413    // Parse (optional) attributes (most likely GNU strong-using extension).
414    MaybeParseGNUAttributes(attrs);
415
416  // Eat ';'.
417  DeclEnd = Tok.getLocation();
418  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
419                   !attrs.empty() ? "attributes list" :
420                   IsAliasDecl ? "alias declaration" : "using declaration",
421                   tok::semi);
422
423  // Diagnose an attempt to declare a templated using-declaration.
424  // TODO: in C++0x, alias-declarations can be templates:
425  //   template <...> using id = type;
426  if (TemplateInfo.Kind) {
427    SourceRange R = TemplateInfo.getSourceRange();
428    Diag(UsingLoc, diag::err_templated_using_declaration)
429      << R << FixItHint::CreateRemoval(R);
430
431    // Unfortunately, we have to bail out instead of recovering by
432    // ignoring the parameters, just in case the nested name specifier
433    // depends on the parameters.
434    return 0;
435  }
436
437  if (IsAliasDecl)
438    return Actions.ActOnAliasDeclaration(getCurScope(), AS, UsingLoc, Name,
439                                         TypeAlias);
440
441  return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS,
442                                       Name, attrs.getList(),
443                                       IsTypeName, TypenameLoc);
444}
445
446/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration.
447///
448/// [C++0x] static_assert-declaration:
449///           static_assert ( constant-expression  ,  string-literal  ) ;
450///
451/// [C1X]   static_assert-declaration:
452///           _Static_assert ( constant-expression  ,  string-literal  ) ;
453///
454Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
455  assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
456         "Not a static_assert declaration");
457
458  if (Tok.is(tok::kw__Static_assert) && !getLang().C1X)
459    Diag(Tok, diag::ext_c1x_static_assert);
460
461  SourceLocation StaticAssertLoc = ConsumeToken();
462
463  if (Tok.isNot(tok::l_paren)) {
464    Diag(Tok, diag::err_expected_lparen);
465    return 0;
466  }
467
468  SourceLocation LParenLoc = ConsumeParen();
469
470  ExprResult AssertExpr(ParseConstantExpression());
471  if (AssertExpr.isInvalid()) {
472    SkipUntil(tok::semi);
473    return 0;
474  }
475
476  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
477    return 0;
478
479  if (Tok.isNot(tok::string_literal)) {
480    Diag(Tok, diag::err_expected_string_literal);
481    SkipUntil(tok::semi);
482    return 0;
483  }
484
485  ExprResult AssertMessage(ParseStringLiteralExpression());
486  if (AssertMessage.isInvalid())
487    return 0;
488
489  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
490
491  DeclEnd = Tok.getLocation();
492  ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
493
494  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
495                                              AssertExpr.take(),
496                                              AssertMessage.take(),
497                                              RParenLoc);
498}
499
500/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
501///
502/// 'decltype' ( expression )
503///
504void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
505  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
506
507  SourceLocation StartLoc = ConsumeToken();
508  SourceLocation LParenLoc = Tok.getLocation();
509
510  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
511                       "decltype")) {
512    SkipUntil(tok::r_paren);
513    return;
514  }
515
516  // Parse the expression
517
518  // C++0x [dcl.type.simple]p4:
519  //   The operand of the decltype specifier is an unevaluated operand.
520  EnterExpressionEvaluationContext Unevaluated(Actions,
521                                               Sema::Unevaluated);
522  ExprResult Result = ParseExpression();
523  if (Result.isInvalid()) {
524    SkipUntil(tok::r_paren);
525    return;
526  }
527
528  // Match the ')'
529  SourceLocation RParenLoc;
530  if (Tok.is(tok::r_paren))
531    RParenLoc = ConsumeParen();
532  else
533    MatchRHSPunctuation(tok::r_paren, LParenLoc);
534
535  if (RParenLoc.isInvalid())
536    return;
537
538  const char *PrevSpec = 0;
539  unsigned DiagID;
540  // Check for duplicate type specifiers (e.g. "int decltype(a)").
541  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
542                         DiagID, Result.release()))
543    Diag(StartLoc, DiagID) << PrevSpec;
544}
545
546/// ParseClassName - Parse a C++ class-name, which names a class. Note
547/// that we only check that the result names a type; semantic analysis
548/// will need to verify that the type names a class. The result is
549/// either a type or NULL, depending on whether a type name was
550/// found.
551///
552///       class-name: [C++ 9.1]
553///         identifier
554///         simple-template-id
555///
556Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
557                                          CXXScopeSpec &SS) {
558  // Check whether we have a template-id that names a type.
559  if (Tok.is(tok::annot_template_id)) {
560    TemplateIdAnnotation *TemplateId
561      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
562    if (TemplateId->Kind == TNK_Type_template ||
563        TemplateId->Kind == TNK_Dependent_template_name) {
564      AnnotateTemplateIdTokenAsType();
565
566      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
567      ParsedType Type = getTypeAnnotation(Tok);
568      EndLocation = Tok.getAnnotationEndLoc();
569      ConsumeToken();
570
571      if (Type)
572        return Type;
573      return true;
574    }
575
576    // Fall through to produce an error below.
577  }
578
579  if (Tok.isNot(tok::identifier)) {
580    Diag(Tok, diag::err_expected_class_name);
581    return true;
582  }
583
584  IdentifierInfo *Id = Tok.getIdentifierInfo();
585  SourceLocation IdLoc = ConsumeToken();
586
587  if (Tok.is(tok::less)) {
588    // It looks the user intended to write a template-id here, but the
589    // template-name was wrong. Try to fix that.
590    TemplateNameKind TNK = TNK_Type_template;
591    TemplateTy Template;
592    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
593                                             &SS, Template, TNK)) {
594      Diag(IdLoc, diag::err_unknown_template_name)
595        << Id;
596    }
597
598    if (!Template)
599      return true;
600
601    // Form the template name
602    UnqualifiedId TemplateName;
603    TemplateName.setIdentifier(Id, IdLoc);
604
605    // Parse the full template-id, then turn it into a type.
606    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
607                                SourceLocation(), true))
608      return true;
609    if (TNK == TNK_Dependent_template_name)
610      AnnotateTemplateIdTokenAsType();
611
612    // If we didn't end up with a typename token, there's nothing more we
613    // can do.
614    if (Tok.isNot(tok::annot_typename))
615      return true;
616
617    // Retrieve the type from the annotation token, consume that token, and
618    // return.
619    EndLocation = Tok.getAnnotationEndLoc();
620    ParsedType Type = getTypeAnnotation(Tok);
621    ConsumeToken();
622    return Type;
623  }
624
625  // We have an identifier; check whether it is actually a type.
626  ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
627                                        false, ParsedType(),
628                                        /*NonTrivialTypeSourceInfo=*/true);
629  if (!Type) {
630    Diag(IdLoc, diag::err_expected_class_name);
631    return true;
632  }
633
634  // Consume the identifier.
635  EndLocation = IdLoc;
636
637  // Fake up a Declarator to use with ActOnTypeName.
638  DeclSpec DS(AttrFactory);
639  DS.SetRangeStart(IdLoc);
640  DS.SetRangeEnd(EndLocation);
641  DS.getTypeSpecScope() = SS;
642
643  const char *PrevSpec = 0;
644  unsigned DiagID;
645  DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
646
647  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
648  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
649}
650
651/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
652/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
653/// until we reach the start of a definition or see a token that
654/// cannot start a definition. If SuppressDeclarations is true, we do know.
655///
656///       class-specifier: [C++ class]
657///         class-head '{' member-specification[opt] '}'
658///         class-head '{' member-specification[opt] '}' attributes[opt]
659///       class-head:
660///         class-key identifier[opt] base-clause[opt]
661///         class-key nested-name-specifier identifier base-clause[opt]
662///         class-key nested-name-specifier[opt] simple-template-id
663///                          base-clause[opt]
664/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
665/// [GNU]   class-key attributes[opt] nested-name-specifier
666///                          identifier base-clause[opt]
667/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
668///                          simple-template-id base-clause[opt]
669///       class-key:
670///         'class'
671///         'struct'
672///         'union'
673///
674///       elaborated-type-specifier: [C++ dcl.type.elab]
675///         class-key ::[opt] nested-name-specifier[opt] identifier
676///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
677///                          simple-template-id
678///
679///  Note that the C++ class-specifier and elaborated-type-specifier,
680///  together, subsume the C99 struct-or-union-specifier:
681///
682///       struct-or-union-specifier: [C99 6.7.2.1]
683///         struct-or-union identifier[opt] '{' struct-contents '}'
684///         struct-or-union identifier
685/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
686///                                                         '}' attributes[opt]
687/// [GNU]   struct-or-union attributes[opt] identifier
688///       struct-or-union:
689///         'struct'
690///         'union'
691void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
692                                 SourceLocation StartLoc, DeclSpec &DS,
693                                 const ParsedTemplateInfo &TemplateInfo,
694                                 AccessSpecifier AS, bool SuppressDeclarations){
695  DeclSpec::TST TagType;
696  if (TagTokKind == tok::kw_struct)
697    TagType = DeclSpec::TST_struct;
698  else if (TagTokKind == tok::kw_class)
699    TagType = DeclSpec::TST_class;
700  else {
701    assert(TagTokKind == tok::kw_union && "Not a class specifier");
702    TagType = DeclSpec::TST_union;
703  }
704
705  if (Tok.is(tok::code_completion)) {
706    // Code completion for a struct, class, or union name.
707    Actions.CodeCompleteTag(getCurScope(), TagType);
708    ConsumeCodeCompletionToken();
709  }
710
711  // C++03 [temp.explicit] 14.7.2/8:
712  //   The usual access checking rules do not apply to names used to specify
713  //   explicit instantiations.
714  //
715  // As an extension we do not perform access checking on the names used to
716  // specify explicit specializations either. This is important to allow
717  // specializing traits classes for private types.
718  bool SuppressingAccessChecks = false;
719  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
720      TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) {
721    Actions.ActOnStartSuppressingAccessChecks();
722    SuppressingAccessChecks = true;
723  }
724
725  ParsedAttributes attrs(AttrFactory);
726  // If attributes exist after tag, parse them.
727  if (Tok.is(tok::kw___attribute))
728    ParseGNUAttributes(attrs);
729
730  // If declspecs exist after tag, parse them.
731  while (Tok.is(tok::kw___declspec))
732    ParseMicrosoftDeclSpec(attrs);
733
734  // If C++0x attributes exist here, parse them.
735  // FIXME: Are we consistent with the ordering of parsing of different
736  // styles of attributes?
737  MaybeParseCXX0XAttributes(attrs);
738
739  if (TagType == DeclSpec::TST_struct &&
740      !Tok.is(tok::identifier) &&
741      Tok.getIdentifierInfo() &&
742      (Tok.is(tok::kw___is_arithmetic) ||
743       Tok.is(tok::kw___is_convertible) ||
744       Tok.is(tok::kw___is_empty) ||
745       Tok.is(tok::kw___is_floating_point) ||
746       Tok.is(tok::kw___is_function) ||
747       Tok.is(tok::kw___is_fundamental) ||
748       Tok.is(tok::kw___is_integral) ||
749       Tok.is(tok::kw___is_member_function_pointer) ||
750       Tok.is(tok::kw___is_member_pointer) ||
751       Tok.is(tok::kw___is_pod) ||
752       Tok.is(tok::kw___is_pointer) ||
753       Tok.is(tok::kw___is_same) ||
754       Tok.is(tok::kw___is_scalar) ||
755       Tok.is(tok::kw___is_signed) ||
756       Tok.is(tok::kw___is_unsigned) ||
757       Tok.is(tok::kw___is_void))) {
758    // GNU libstdc++ 4.2 and libc++ uaw certain intrinsic names as the
759    // name of struct templates, but some are keywords in GCC >= 4.3
760    // and Clang. Therefore, when we see the token sequence "struct
761    // X", make X into a normal identifier rather than a keyword, to
762    // allow libstdc++ 4.2 and libc++ to work properly.
763    Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
764    Tok.setKind(tok::identifier);
765  }
766
767  // Parse the (optional) nested-name-specifier.
768  CXXScopeSpec &SS = DS.getTypeSpecScope();
769  if (getLang().CPlusPlus) {
770    // "FOO : BAR" is not a potential typo for "FOO::BAR".
771    ColonProtectionRAIIObject X(*this);
772
773    if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true))
774      DS.SetTypeSpecError();
775    if (SS.isSet())
776      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
777        Diag(Tok, diag::err_expected_ident);
778  }
779
780  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
781
782  // Parse the (optional) class name or simple-template-id.
783  IdentifierInfo *Name = 0;
784  SourceLocation NameLoc;
785  TemplateIdAnnotation *TemplateId = 0;
786  if (Tok.is(tok::identifier)) {
787    Name = Tok.getIdentifierInfo();
788    NameLoc = ConsumeToken();
789
790    if (Tok.is(tok::less) && getLang().CPlusPlus) {
791      // The name was supposed to refer to a template, but didn't.
792      // Eat the template argument list and try to continue parsing this as
793      // a class (or template thereof).
794      TemplateArgList TemplateArgs;
795      SourceLocation LAngleLoc, RAngleLoc;
796      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
797                                           true, LAngleLoc,
798                                           TemplateArgs, RAngleLoc)) {
799        // We couldn't parse the template argument list at all, so don't
800        // try to give any location information for the list.
801        LAngleLoc = RAngleLoc = SourceLocation();
802      }
803
804      Diag(NameLoc, diag::err_explicit_spec_non_template)
805        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
806        << (TagType == DeclSpec::TST_class? 0
807            : TagType == DeclSpec::TST_struct? 1
808            : 2)
809        << Name
810        << SourceRange(LAngleLoc, RAngleLoc);
811
812      // Strip off the last template parameter list if it was empty, since
813      // we've removed its template argument list.
814      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
815        if (TemplateParams && TemplateParams->size() > 1) {
816          TemplateParams->pop_back();
817        } else {
818          TemplateParams = 0;
819          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
820            = ParsedTemplateInfo::NonTemplate;
821        }
822      } else if (TemplateInfo.Kind
823                                == ParsedTemplateInfo::ExplicitInstantiation) {
824        // Pretend this is just a forward declaration.
825        TemplateParams = 0;
826        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
827          = ParsedTemplateInfo::NonTemplate;
828        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
829          = SourceLocation();
830        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
831          = SourceLocation();
832      }
833    }
834  } else if (Tok.is(tok::annot_template_id)) {
835    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
836    NameLoc = ConsumeToken();
837
838    if (TemplateId->Kind != TNK_Type_template &&
839        TemplateId->Kind != TNK_Dependent_template_name) {
840      // The template-name in the simple-template-id refers to
841      // something other than a class template. Give an appropriate
842      // error message and skip to the ';'.
843      SourceRange Range(NameLoc);
844      if (SS.isNotEmpty())
845        Range.setBegin(SS.getBeginLoc());
846
847      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
848        << Name << static_cast<int>(TemplateId->Kind) << Range;
849
850      DS.SetTypeSpecError();
851      SkipUntil(tok::semi, false, true);
852      TemplateId->Destroy();
853      if (SuppressingAccessChecks)
854        Actions.ActOnStopSuppressingAccessChecks();
855
856      return;
857    }
858  }
859
860  // As soon as we're finished parsing the class's template-id, turn access
861  // checking back on.
862  if (SuppressingAccessChecks)
863    Actions.ActOnStopSuppressingAccessChecks();
864
865  // There are four options here.  If we have 'struct foo;', then this
866  // is either a forward declaration or a friend declaration, which
867  // have to be treated differently.  If we have 'struct foo {...',
868  // 'struct foo :...' or 'struct foo final[opt]' then this is a
869  // definition. Otherwise we have something like 'struct foo xyz', a reference.
870  // However, in some contexts, things look like declarations but are just
871  // references, e.g.
872  // new struct s;
873  // or
874  // &T::operator struct s;
875  // For these, SuppressDeclarations is true.
876  Sema::TagUseKind TUK;
877  if (SuppressDeclarations)
878    TUK = Sema::TUK_Reference;
879  else if (Tok.is(tok::l_brace) ||
880           (getLang().CPlusPlus && Tok.is(tok::colon)) ||
881           isCXX0XFinalKeyword()) {
882    if (DS.isFriendSpecified()) {
883      // C++ [class.friend]p2:
884      //   A class shall not be defined in a friend declaration.
885      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
886        << SourceRange(DS.getFriendSpecLoc());
887
888      // Skip everything up to the semicolon, so that this looks like a proper
889      // friend class (or template thereof) declaration.
890      SkipUntil(tok::semi, true, true);
891      TUK = Sema::TUK_Friend;
892    } else {
893      // Okay, this is a class definition.
894      TUK = Sema::TUK_Definition;
895    }
896  } else if (Tok.is(tok::semi))
897    TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
898  else
899    TUK = Sema::TUK_Reference;
900
901  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
902                               TUK != Sema::TUK_Definition)) {
903    if (DS.getTypeSpecType() != DeclSpec::TST_error) {
904      // We have a declaration or reference to an anonymous class.
905      Diag(StartLoc, diag::err_anon_type_definition)
906        << DeclSpec::getSpecifierName(TagType);
907    }
908
909    SkipUntil(tok::comma, true);
910
911    if (TemplateId)
912      TemplateId->Destroy();
913    return;
914  }
915
916  // Create the tag portion of the class or class template.
917  DeclResult TagOrTempResult = true; // invalid
918  TypeResult TypeResult = true; // invalid
919
920  bool Owned = false;
921  if (TemplateId) {
922    // Explicit specialization, class template partial specialization,
923    // or explicit instantiation.
924    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
925                                       TemplateId->getTemplateArgs(),
926                                       TemplateId->NumArgs);
927    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
928        TUK == Sema::TUK_Declaration) {
929      // This is an explicit instantiation of a class template.
930      TagOrTempResult
931        = Actions.ActOnExplicitInstantiation(getCurScope(),
932                                             TemplateInfo.ExternLoc,
933                                             TemplateInfo.TemplateLoc,
934                                             TagType,
935                                             StartLoc,
936                                             SS,
937                                             TemplateId->Template,
938                                             TemplateId->TemplateNameLoc,
939                                             TemplateId->LAngleLoc,
940                                             TemplateArgsPtr,
941                                             TemplateId->RAngleLoc,
942                                             attrs.getList());
943
944    // Friend template-ids are treated as references unless
945    // they have template headers, in which case they're ill-formed
946    // (FIXME: "template <class T> friend class A<T>::B<int>;").
947    // We diagnose this error in ActOnClassTemplateSpecialization.
948    } else if (TUK == Sema::TUK_Reference ||
949               (TUK == Sema::TUK_Friend &&
950                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
951      TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType,
952                                                  StartLoc,
953                                                  TemplateId->SS,
954                                                  TemplateId->Template,
955                                                  TemplateId->TemplateNameLoc,
956                                                  TemplateId->LAngleLoc,
957                                                  TemplateArgsPtr,
958                                                  TemplateId->RAngleLoc);
959    } else {
960      // This is an explicit specialization or a class template
961      // partial specialization.
962      TemplateParameterLists FakedParamLists;
963
964      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
965        // This looks like an explicit instantiation, because we have
966        // something like
967        //
968        //   template class Foo<X>
969        //
970        // but it actually has a definition. Most likely, this was
971        // meant to be an explicit specialization, but the user forgot
972        // the '<>' after 'template'.
973        assert(TUK == Sema::TUK_Definition && "Expected a definition here");
974
975        SourceLocation LAngleLoc
976          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
977        Diag(TemplateId->TemplateNameLoc,
978             diag::err_explicit_instantiation_with_definition)
979          << SourceRange(TemplateInfo.TemplateLoc)
980          << FixItHint::CreateInsertion(LAngleLoc, "<>");
981
982        // Create a fake template parameter list that contains only
983        // "template<>", so that we treat this construct as a class
984        // template specialization.
985        FakedParamLists.push_back(
986          Actions.ActOnTemplateParameterList(0, SourceLocation(),
987                                             TemplateInfo.TemplateLoc,
988                                             LAngleLoc,
989                                             0, 0,
990                                             LAngleLoc));
991        TemplateParams = &FakedParamLists;
992      }
993
994      // Build the class template specialization.
995      TagOrTempResult
996        = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
997                       StartLoc, SS,
998                       TemplateId->Template,
999                       TemplateId->TemplateNameLoc,
1000                       TemplateId->LAngleLoc,
1001                       TemplateArgsPtr,
1002                       TemplateId->RAngleLoc,
1003                       attrs.getList(),
1004                       MultiTemplateParamsArg(Actions,
1005                                    TemplateParams? &(*TemplateParams)[0] : 0,
1006                                 TemplateParams? TemplateParams->size() : 0));
1007    }
1008    TemplateId->Destroy();
1009  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1010             TUK == Sema::TUK_Declaration) {
1011    // Explicit instantiation of a member of a class template
1012    // specialization, e.g.,
1013    //
1014    //   template struct Outer<int>::Inner;
1015    //
1016    TagOrTempResult
1017      = Actions.ActOnExplicitInstantiation(getCurScope(),
1018                                           TemplateInfo.ExternLoc,
1019                                           TemplateInfo.TemplateLoc,
1020                                           TagType, StartLoc, SS, Name,
1021                                           NameLoc, attrs.getList());
1022  } else if (TUK == Sema::TUK_Friend &&
1023             TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1024    TagOrTempResult =
1025      Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1026                                      TagType, StartLoc, SS,
1027                                      Name, NameLoc, attrs.getList(),
1028                                      MultiTemplateParamsArg(Actions,
1029                                    TemplateParams? &(*TemplateParams)[0] : 0,
1030                                 TemplateParams? TemplateParams->size() : 0));
1031  } else {
1032    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1033        TUK == Sema::TUK_Definition) {
1034      // FIXME: Diagnose this particular error.
1035    }
1036
1037    bool IsDependent = false;
1038
1039    // Don't pass down template parameter lists if this is just a tag
1040    // reference.  For example, we don't need the template parameters here:
1041    //   template <class T> class A *makeA(T t);
1042    MultiTemplateParamsArg TParams;
1043    if (TUK != Sema::TUK_Reference && TemplateParams)
1044      TParams =
1045        MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1046
1047    // Declaration or definition of a class type
1048    TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1049                                       SS, Name, NameLoc, attrs.getList(), AS,
1050                                       TParams, Owned, IsDependent, false,
1051                                       false, clang::TypeResult());
1052
1053    // If ActOnTag said the type was dependent, try again with the
1054    // less common call.
1055    if (IsDependent) {
1056      assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1057      TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1058                                             SS, Name, StartLoc, NameLoc);
1059    }
1060  }
1061
1062  // If there is a body, parse it and inform the actions module.
1063  if (TUK == Sema::TUK_Definition) {
1064    assert(Tok.is(tok::l_brace) ||
1065           (getLang().CPlusPlus && Tok.is(tok::colon)) ||
1066           isCXX0XFinalKeyword());
1067    if (getLang().CPlusPlus)
1068      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
1069    else
1070      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1071  }
1072
1073  const char *PrevSpec = 0;
1074  unsigned DiagID;
1075  bool Result;
1076  if (!TypeResult.isInvalid()) {
1077    Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1078                                NameLoc.isValid() ? NameLoc : StartLoc,
1079                                PrevSpec, DiagID, TypeResult.get());
1080  } else if (!TagOrTempResult.isInvalid()) {
1081    Result = DS.SetTypeSpecType(TagType, StartLoc,
1082                                NameLoc.isValid() ? NameLoc : StartLoc,
1083                                PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1084  } else {
1085    DS.SetTypeSpecError();
1086    return;
1087  }
1088
1089  if (Result)
1090    Diag(StartLoc, DiagID) << PrevSpec;
1091
1092  // At this point, we've successfully parsed a class-specifier in 'definition'
1093  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
1094  // going to look at what comes after it to improve error recovery.  If an
1095  // impossible token occurs next, we assume that the programmer forgot a ; at
1096  // the end of the declaration and recover that way.
1097  //
1098  // This switch enumerates the valid "follow" set for definition.
1099  if (TUK == Sema::TUK_Definition) {
1100    bool ExpectedSemi = true;
1101    switch (Tok.getKind()) {
1102    default: break;
1103    case tok::semi:               // struct foo {...} ;
1104    case tok::star:               // struct foo {...} *         P;
1105    case tok::amp:                // struct foo {...} &         R = ...
1106    case tok::identifier:         // struct foo {...} V         ;
1107    case tok::r_paren:            //(struct foo {...} )         {4}
1108    case tok::annot_cxxscope:     // struct foo {...} a::       b;
1109    case tok::annot_typename:     // struct foo {...} a         ::b;
1110    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
1111    case tok::l_paren:            // struct foo {...} (         x);
1112    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
1113      ExpectedSemi = false;
1114      break;
1115    // Type qualifiers
1116    case tok::kw_const:           // struct foo {...} const     x;
1117    case tok::kw_volatile:        // struct foo {...} volatile  x;
1118    case tok::kw_restrict:        // struct foo {...} restrict  x;
1119    case tok::kw_inline:          // struct foo {...} inline    foo() {};
1120    // Storage-class specifiers
1121    case tok::kw_static:          // struct foo {...} static    x;
1122    case tok::kw_extern:          // struct foo {...} extern    x;
1123    case tok::kw_typedef:         // struct foo {...} typedef   x;
1124    case tok::kw_register:        // struct foo {...} register  x;
1125    case tok::kw_auto:            // struct foo {...} auto      x;
1126    case tok::kw_mutable:         // struct foo {...} mutable      x;
1127      // As shown above, type qualifiers and storage class specifiers absolutely
1128      // can occur after class specifiers according to the grammar.  However,
1129      // almost no one actually writes code like this.  If we see one of these,
1130      // it is much more likely that someone missed a semi colon and the
1131      // type/storage class specifier we're seeing is part of the *next*
1132      // intended declaration, as in:
1133      //
1134      //   struct foo { ... }
1135      //   typedef int X;
1136      //
1137      // We'd really like to emit a missing semicolon error instead of emitting
1138      // an error on the 'int' saying that you can't have two type specifiers in
1139      // the same declaration of X.  Because of this, we look ahead past this
1140      // token to see if it's a type specifier.  If so, we know the code is
1141      // otherwise invalid, so we can produce the expected semi error.
1142      if (!isKnownToBeTypeSpecifier(NextToken()))
1143        ExpectedSemi = false;
1144      break;
1145
1146    case tok::r_brace:  // struct bar { struct foo {...} }
1147      // Missing ';' at end of struct is accepted as an extension in C mode.
1148      if (!getLang().CPlusPlus)
1149        ExpectedSemi = false;
1150      break;
1151    }
1152
1153    if (ExpectedSemi) {
1154      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1155                       TagType == DeclSpec::TST_class ? "class"
1156                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1157      // Push this token back into the preprocessor and change our current token
1158      // to ';' so that the rest of the code recovers as though there were an
1159      // ';' after the definition.
1160      PP.EnterToken(Tok);
1161      Tok.setKind(tok::semi);
1162    }
1163  }
1164}
1165
1166/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1167///
1168///       base-clause : [C++ class.derived]
1169///         ':' base-specifier-list
1170///       base-specifier-list:
1171///         base-specifier '...'[opt]
1172///         base-specifier-list ',' base-specifier '...'[opt]
1173void Parser::ParseBaseClause(Decl *ClassDecl) {
1174  assert(Tok.is(tok::colon) && "Not a base clause");
1175  ConsumeToken();
1176
1177  // Build up an array of parsed base specifiers.
1178  llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1179
1180  while (true) {
1181    // Parse a base-specifier.
1182    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1183    if (Result.isInvalid()) {
1184      // Skip the rest of this base specifier, up until the comma or
1185      // opening brace.
1186      SkipUntil(tok::comma, tok::l_brace, true, true);
1187    } else {
1188      // Add this to our array of base specifiers.
1189      BaseInfo.push_back(Result.get());
1190    }
1191
1192    // If the next token is a comma, consume it and keep reading
1193    // base-specifiers.
1194    if (Tok.isNot(tok::comma)) break;
1195
1196    // Consume the comma.
1197    ConsumeToken();
1198  }
1199
1200  // Attach the base specifiers
1201  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1202}
1203
1204/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1205/// one entry in the base class list of a class specifier, for example:
1206///    class foo : public bar, virtual private baz {
1207/// 'public bar' and 'virtual private baz' are each base-specifiers.
1208///
1209///       base-specifier: [C++ class.derived]
1210///         ::[opt] nested-name-specifier[opt] class-name
1211///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1212///                        class-name
1213///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1214///                        class-name
1215Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1216  bool IsVirtual = false;
1217  SourceLocation StartLoc = Tok.getLocation();
1218
1219  // Parse the 'virtual' keyword.
1220  if (Tok.is(tok::kw_virtual))  {
1221    ConsumeToken();
1222    IsVirtual = true;
1223  }
1224
1225  // Parse an (optional) access specifier.
1226  AccessSpecifier Access = getAccessSpecifierIfPresent();
1227  if (Access != AS_none)
1228    ConsumeToken();
1229
1230  // Parse the 'virtual' keyword (again!), in case it came after the
1231  // access specifier.
1232  if (Tok.is(tok::kw_virtual))  {
1233    SourceLocation VirtualLoc = ConsumeToken();
1234    if (IsVirtual) {
1235      // Complain about duplicate 'virtual'
1236      Diag(VirtualLoc, diag::err_dup_virtual)
1237        << FixItHint::CreateRemoval(VirtualLoc);
1238    }
1239
1240    IsVirtual = true;
1241  }
1242
1243  // Parse optional '::' and optional nested-name-specifier.
1244  CXXScopeSpec SS;
1245  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
1246
1247  // The location of the base class itself.
1248  SourceLocation BaseLoc = Tok.getLocation();
1249
1250  // Parse the class-name.
1251  SourceLocation EndLocation;
1252  TypeResult BaseType = ParseClassName(EndLocation, SS);
1253  if (BaseType.isInvalid())
1254    return true;
1255
1256  // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1257  // actually part of the base-specifier-list grammar productions, but we
1258  // parse it here for convenience.
1259  SourceLocation EllipsisLoc;
1260  if (Tok.is(tok::ellipsis))
1261    EllipsisLoc = ConsumeToken();
1262
1263  // Find the complete source range for the base-specifier.
1264  SourceRange Range(StartLoc, EndLocation);
1265
1266  // Notify semantic analysis that we have parsed a complete
1267  // base-specifier.
1268  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1269                                    BaseType.get(), BaseLoc, EllipsisLoc);
1270}
1271
1272/// getAccessSpecifierIfPresent - Determine whether the next token is
1273/// a C++ access-specifier.
1274///
1275///       access-specifier: [C++ class.derived]
1276///         'private'
1277///         'protected'
1278///         'public'
1279AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1280  switch (Tok.getKind()) {
1281  default: return AS_none;
1282  case tok::kw_private: return AS_private;
1283  case tok::kw_protected: return AS_protected;
1284  case tok::kw_public: return AS_public;
1285  }
1286}
1287
1288void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1289                                             Decl *ThisDecl) {
1290  // We just declared a member function. If this member function
1291  // has any default arguments, we'll need to parse them later.
1292  LateParsedMethodDeclaration *LateMethod = 0;
1293  DeclaratorChunk::FunctionTypeInfo &FTI
1294    = DeclaratorInfo.getFunctionTypeInfo();
1295  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1296    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1297      if (!LateMethod) {
1298        // Push this method onto the stack of late-parsed method
1299        // declarations.
1300        LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1301        getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1302        LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1303
1304        // Add all of the parameters prior to this one (they don't
1305        // have default arguments).
1306        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1307        for (unsigned I = 0; I < ParamIdx; ++I)
1308          LateMethod->DefaultArgs.push_back(
1309                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1310      }
1311
1312      // Add this parameter to the list of parameters (it or may
1313      // not have a default argument).
1314      LateMethod->DefaultArgs.push_back(
1315        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1316                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1317    }
1318  }
1319}
1320
1321/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x
1322/// virt-specifier.
1323///
1324///       virt-specifier:
1325///         override
1326///         final
1327VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const {
1328  if (!getLang().CPlusPlus)
1329    return VirtSpecifiers::VS_None;
1330
1331  if (Tok.is(tok::identifier)) {
1332    IdentifierInfo *II = Tok.getIdentifierInfo();
1333
1334    // Initialize the contextual keywords.
1335    if (!Ident_final) {
1336      Ident_final = &PP.getIdentifierTable().get("final");
1337      Ident_override = &PP.getIdentifierTable().get("override");
1338    }
1339
1340    if (II == Ident_override)
1341      return VirtSpecifiers::VS_Override;
1342
1343    if (II == Ident_final)
1344      return VirtSpecifiers::VS_Final;
1345  }
1346
1347  return VirtSpecifiers::VS_None;
1348}
1349
1350/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq.
1351///
1352///       virt-specifier-seq:
1353///         virt-specifier
1354///         virt-specifier-seq virt-specifier
1355void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) {
1356  while (true) {
1357    VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier();
1358    if (Specifier == VirtSpecifiers::VS_None)
1359      return;
1360
1361    // C++ [class.mem]p8:
1362    //   A virt-specifier-seq shall contain at most one of each virt-specifier.
1363    const char *PrevSpec = 0;
1364    if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1365      Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1366        << PrevSpec
1367        << FixItHint::CreateRemoval(Tok.getLocation());
1368
1369    if (!getLang().CPlusPlus0x)
1370      Diag(Tok.getLocation(), diag::ext_override_control_keyword)
1371        << VirtSpecifiers::getSpecifierName(Specifier);
1372    ConsumeToken();
1373  }
1374}
1375
1376/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x
1377/// contextual 'final' keyword.
1378bool Parser::isCXX0XFinalKeyword() const {
1379  if (!getLang().CPlusPlus)
1380    return false;
1381
1382  if (!Tok.is(tok::identifier))
1383    return false;
1384
1385  // Initialize the contextual keywords.
1386  if (!Ident_final) {
1387    Ident_final = &PP.getIdentifierTable().get("final");
1388    Ident_override = &PP.getIdentifierTable().get("override");
1389  }
1390
1391  return Tok.getIdentifierInfo() == Ident_final;
1392}
1393
1394/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1395///
1396///       member-declaration:
1397///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1398///         function-definition ';'[opt]
1399///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1400///         using-declaration                                            [TODO]
1401/// [C++0x] static_assert-declaration
1402///         template-declaration
1403/// [GNU]   '__extension__' member-declaration
1404///
1405///       member-declarator-list:
1406///         member-declarator
1407///         member-declarator-list ',' member-declarator
1408///
1409///       member-declarator:
1410///         declarator virt-specifier-seq[opt] pure-specifier[opt]
1411///         declarator constant-initializer[opt]
1412///         identifier[opt] ':' constant-expression
1413///
1414///       virt-specifier-seq:
1415///         virt-specifier
1416///         virt-specifier-seq virt-specifier
1417///
1418///       virt-specifier:
1419///         override
1420///         final
1421///         new
1422///
1423///       pure-specifier:
1424///         '= 0'
1425///
1426///       constant-initializer:
1427///         '=' constant-expression
1428///
1429void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1430                                       const ParsedTemplateInfo &TemplateInfo,
1431                                       ParsingDeclRAIIObject *TemplateDiags) {
1432  if (Tok.is(tok::at)) {
1433    if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1434      Diag(Tok, diag::err_at_defs_cxx);
1435    else
1436      Diag(Tok, diag::err_at_in_class);
1437
1438    ConsumeToken();
1439    SkipUntil(tok::r_brace);
1440    return;
1441  }
1442
1443  // Access declarations.
1444  if (!TemplateInfo.Kind &&
1445      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1446      !TryAnnotateCXXScopeToken() &&
1447      Tok.is(tok::annot_cxxscope)) {
1448    bool isAccessDecl = false;
1449    if (NextToken().is(tok::identifier))
1450      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1451    else
1452      isAccessDecl = NextToken().is(tok::kw_operator);
1453
1454    if (isAccessDecl) {
1455      // Collect the scope specifier token we annotated earlier.
1456      CXXScopeSpec SS;
1457      ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1458
1459      // Try to parse an unqualified-id.
1460      UnqualifiedId Name;
1461      if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) {
1462        SkipUntil(tok::semi);
1463        return;
1464      }
1465
1466      // TODO: recover from mistakenly-qualified operator declarations.
1467      if (ExpectAndConsume(tok::semi,
1468                           diag::err_expected_semi_after,
1469                           "access declaration",
1470                           tok::semi))
1471        return;
1472
1473      Actions.ActOnUsingDeclaration(getCurScope(), AS,
1474                                    false, SourceLocation(),
1475                                    SS, Name,
1476                                    /* AttrList */ 0,
1477                                    /* IsTypeName */ false,
1478                                    SourceLocation());
1479      return;
1480    }
1481  }
1482
1483  // static_assert-declaration
1484  if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1485    // FIXME: Check for templates
1486    SourceLocation DeclEnd;
1487    ParseStaticAssertDeclaration(DeclEnd);
1488    return;
1489  }
1490
1491  if (Tok.is(tok::kw_template)) {
1492    assert(!TemplateInfo.TemplateParams &&
1493           "Nested template improperly parsed?");
1494    SourceLocation DeclEnd;
1495    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1496                                         AS);
1497    return;
1498  }
1499
1500  // Handle:  member-declaration ::= '__extension__' member-declaration
1501  if (Tok.is(tok::kw___extension__)) {
1502    // __extension__ silences extension warnings in the subexpression.
1503    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1504    ConsumeToken();
1505    return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags);
1506  }
1507
1508  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1509  // is a bitfield.
1510  ColonProtectionRAIIObject X(*this);
1511
1512  ParsedAttributesWithRange attrs(AttrFactory);
1513  // Optional C++0x attribute-specifier
1514  MaybeParseCXX0XAttributes(attrs);
1515  MaybeParseMicrosoftAttributes(attrs);
1516
1517  if (Tok.is(tok::kw_using)) {
1518    // FIXME: Check for template aliases
1519
1520    ProhibitAttributes(attrs);
1521
1522    // Eat 'using'.
1523    SourceLocation UsingLoc = ConsumeToken();
1524
1525    if (Tok.is(tok::kw_namespace)) {
1526      Diag(UsingLoc, diag::err_using_namespace_in_class);
1527      SkipUntil(tok::semi, true, true);
1528    } else {
1529      SourceLocation DeclEnd;
1530      // Otherwise, it must be using-declaration.
1531      ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
1532                            UsingLoc, DeclEnd, AS);
1533    }
1534    return;
1535  }
1536
1537  // decl-specifier-seq:
1538  // Parse the common declaration-specifiers piece.
1539  ParsingDeclSpec DS(*this, TemplateDiags);
1540  DS.takeAttributesFrom(attrs);
1541  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1542
1543  MultiTemplateParamsArg TemplateParams(Actions,
1544      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1545      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1546
1547  if (Tok.is(tok::semi)) {
1548    ConsumeToken();
1549    Decl *TheDecl =
1550      Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
1551    DS.complete(TheDecl);
1552    return;
1553  }
1554
1555  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1556  VirtSpecifiers VS;
1557
1558  if (Tok.isNot(tok::colon)) {
1559    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1560    ColonProtectionRAIIObject X(*this);
1561
1562    // Parse the first declarator.
1563    ParseDeclarator(DeclaratorInfo);
1564    // Error parsing the declarator?
1565    if (!DeclaratorInfo.hasName()) {
1566      // If so, skip until the semi-colon or a }.
1567      SkipUntil(tok::r_brace, true, true);
1568      if (Tok.is(tok::semi))
1569        ConsumeToken();
1570      return;
1571    }
1572
1573    ParseOptionalCXX0XVirtSpecifierSeq(VS);
1574
1575    // If attributes exist after the declarator, but before an '{', parse them.
1576    MaybeParseGNUAttributes(DeclaratorInfo);
1577
1578    // function-definition:
1579    if (Tok.is(tok::l_brace)
1580        || (DeclaratorInfo.isFunctionDeclarator() &&
1581            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1582      if (!DeclaratorInfo.isFunctionDeclarator()) {
1583        Diag(Tok, diag::err_func_def_no_params);
1584        ConsumeBrace();
1585        SkipUntil(tok::r_brace, true);
1586
1587        // Consume the optional ';'
1588        if (Tok.is(tok::semi))
1589          ConsumeToken();
1590        return;
1591      }
1592
1593      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1594        Diag(Tok, diag::err_function_declared_typedef);
1595        // This recovery skips the entire function body. It would be nice
1596        // to simply call ParseCXXInlineMethodDef() below, however Sema
1597        // assumes the declarator represents a function, not a typedef.
1598        ConsumeBrace();
1599        SkipUntil(tok::r_brace, true);
1600
1601        // Consume the optional ';'
1602        if (Tok.is(tok::semi))
1603          ConsumeToken();
1604        return;
1605      }
1606
1607      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS);
1608      // Consume the optional ';'
1609      if (Tok.is(tok::semi))
1610        ConsumeToken();
1611
1612      return;
1613    }
1614  }
1615
1616  // member-declarator-list:
1617  //   member-declarator
1618  //   member-declarator-list ',' member-declarator
1619
1620  llvm::SmallVector<Decl *, 8> DeclsInGroup;
1621  ExprResult BitfieldSize;
1622  ExprResult Init;
1623  bool Deleted = false;
1624
1625  while (1) {
1626    // member-declarator:
1627    //   declarator pure-specifier[opt]
1628    //   declarator constant-initializer[opt]
1629    //   identifier[opt] ':' constant-expression
1630    if (Tok.is(tok::colon)) {
1631      ConsumeToken();
1632      BitfieldSize = ParseConstantExpression();
1633      if (BitfieldSize.isInvalid())
1634        SkipUntil(tok::comma, true, true);
1635    }
1636
1637    ParseOptionalCXX0XVirtSpecifierSeq(VS);
1638
1639    // pure-specifier:
1640    //   '= 0'
1641    //
1642    // constant-initializer:
1643    //   '=' constant-expression
1644    //
1645    // defaulted/deleted function-definition:
1646    //   '=' 'default'                          [TODO]
1647    //   '=' 'delete'
1648    if (Tok.is(tok::equal)) {
1649      ConsumeToken();
1650      if (Tok.is(tok::kw_delete)) {
1651        if (!getLang().CPlusPlus0x)
1652          Diag(Tok, diag::warn_deleted_function_accepted_as_extension);
1653        ConsumeToken();
1654        Deleted = true;
1655      } else {
1656        Init = ParseInitializer();
1657        if (Init.isInvalid())
1658          SkipUntil(tok::comma, true, true);
1659      }
1660    }
1661
1662    // If a simple-asm-expr is present, parse it.
1663    if (Tok.is(tok::kw_asm)) {
1664      SourceLocation Loc;
1665      ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1666      if (AsmLabel.isInvalid())
1667        SkipUntil(tok::comma, true, true);
1668
1669      DeclaratorInfo.setAsmLabel(AsmLabel.release());
1670      DeclaratorInfo.SetRangeEnd(Loc);
1671    }
1672
1673    // If attributes exist after the declarator, parse them.
1674    MaybeParseGNUAttributes(DeclaratorInfo);
1675
1676    // NOTE: If Sema is the Action module and declarator is an instance field,
1677    // this call will *not* return the created decl; It will return null.
1678    // See Sema::ActOnCXXMemberDeclarator for details.
1679
1680    Decl *ThisDecl = 0;
1681    if (DS.isFriendSpecified()) {
1682      // TODO: handle initializers, bitfields, 'delete'
1683      ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
1684                                                 /*IsDefinition*/ false,
1685                                                 move(TemplateParams));
1686    } else {
1687      ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
1688                                                  DeclaratorInfo,
1689                                                  move(TemplateParams),
1690                                                  BitfieldSize.release(),
1691                                                  VS, Init.release(),
1692                                                  /*IsDefinition*/Deleted,
1693                                                  Deleted);
1694    }
1695    if (ThisDecl)
1696      DeclsInGroup.push_back(ThisDecl);
1697
1698    if (DeclaratorInfo.isFunctionDeclarator() &&
1699        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1700          != DeclSpec::SCS_typedef) {
1701      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1702    }
1703
1704    DeclaratorInfo.complete(ThisDecl);
1705
1706    // If we don't have a comma, it is either the end of the list (a ';')
1707    // or an error, bail out.
1708    if (Tok.isNot(tok::comma))
1709      break;
1710
1711    // Consume the comma.
1712    ConsumeToken();
1713
1714    // Parse the next declarator.
1715    DeclaratorInfo.clear();
1716    VS.clear();
1717    BitfieldSize = 0;
1718    Init = 0;
1719    Deleted = false;
1720
1721    // Attributes are only allowed on the second declarator.
1722    MaybeParseGNUAttributes(DeclaratorInfo);
1723
1724    if (Tok.isNot(tok::colon))
1725      ParseDeclarator(DeclaratorInfo);
1726  }
1727
1728  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1729    // Skip to end of block or statement.
1730    SkipUntil(tok::r_brace, true, true);
1731    // If we stopped at a ';', eat it.
1732    if (Tok.is(tok::semi)) ConsumeToken();
1733    return;
1734  }
1735
1736  Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
1737                                  DeclsInGroup.size());
1738}
1739
1740/// ParseCXXMemberSpecification - Parse the class definition.
1741///
1742///       member-specification:
1743///         member-declaration member-specification[opt]
1744///         access-specifier ':' member-specification[opt]
1745///
1746void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1747                                         unsigned TagType, Decl *TagDecl) {
1748  assert((TagType == DeclSpec::TST_struct ||
1749         TagType == DeclSpec::TST_union  ||
1750         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1751
1752  PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
1753                                      "parsing struct/union/class body");
1754
1755  // Determine whether this is a non-nested class. Note that local
1756  // classes are *not* considered to be nested classes.
1757  bool NonNestedClass = true;
1758  if (!ClassStack.empty()) {
1759    for (const Scope *S = getCurScope(); S; S = S->getParent()) {
1760      if (S->isClassScope()) {
1761        // We're inside a class scope, so this is a nested class.
1762        NonNestedClass = false;
1763        break;
1764      }
1765
1766      if ((S->getFlags() & Scope::FnScope)) {
1767        // If we're in a function or function template declared in the
1768        // body of a class, then this is a local class rather than a
1769        // nested class.
1770        const Scope *Parent = S->getParent();
1771        if (Parent->isTemplateParamScope())
1772          Parent = Parent->getParent();
1773        if (Parent->isClassScope())
1774          break;
1775      }
1776    }
1777  }
1778
1779  // Enter a scope for the class.
1780  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1781
1782  // Note that we are parsing a new (potentially-nested) class definition.
1783  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1784
1785  if (TagDecl)
1786    Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
1787
1788  SourceLocation FinalLoc;
1789
1790  // Parse the optional 'final' keyword.
1791  if (getLang().CPlusPlus && Tok.is(tok::identifier)) {
1792    IdentifierInfo *II = Tok.getIdentifierInfo();
1793
1794    // Initialize the contextual keywords.
1795    if (!Ident_final) {
1796      Ident_final = &PP.getIdentifierTable().get("final");
1797      Ident_override = &PP.getIdentifierTable().get("override");
1798    }
1799
1800    if (II == Ident_final)
1801      FinalLoc = ConsumeToken();
1802
1803    if (!getLang().CPlusPlus0x)
1804      Diag(FinalLoc, diag::ext_override_control_keyword) << "final";
1805  }
1806
1807  if (Tok.is(tok::colon)) {
1808    ParseBaseClause(TagDecl);
1809
1810    if (!Tok.is(tok::l_brace)) {
1811      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1812
1813      if (TagDecl)
1814        Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
1815      return;
1816    }
1817  }
1818
1819  assert(Tok.is(tok::l_brace));
1820
1821  SourceLocation LBraceLoc = ConsumeBrace();
1822
1823  if (TagDecl)
1824    Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
1825                                            LBraceLoc);
1826
1827  // C++ 11p3: Members of a class defined with the keyword class are private
1828  // by default. Members of a class defined with the keywords struct or union
1829  // are public by default.
1830  AccessSpecifier CurAS;
1831  if (TagType == DeclSpec::TST_class)
1832    CurAS = AS_private;
1833  else
1834    CurAS = AS_public;
1835
1836  SourceLocation RBraceLoc;
1837  if (TagDecl) {
1838    // While we still have something to read, read the member-declarations.
1839    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1840      // Each iteration of this loop reads one member-declaration.
1841
1842      // Check for extraneous top-level semicolon.
1843      if (Tok.is(tok::semi)) {
1844        Diag(Tok, diag::ext_extra_struct_semi)
1845          << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
1846          << FixItHint::CreateRemoval(Tok.getLocation());
1847        ConsumeToken();
1848        continue;
1849      }
1850
1851      AccessSpecifier AS = getAccessSpecifierIfPresent();
1852      if (AS != AS_none) {
1853        // Current token is a C++ access specifier.
1854        CurAS = AS;
1855        SourceLocation ASLoc = Tok.getLocation();
1856        ConsumeToken();
1857        if (Tok.is(tok::colon))
1858          Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
1859        else
1860          Diag(Tok, diag::err_expected_colon);
1861        ConsumeToken();
1862        continue;
1863      }
1864
1865      // FIXME: Make sure we don't have a template here.
1866
1867      // Parse all the comma separated declarators.
1868      ParseCXXClassMemberDeclaration(CurAS);
1869    }
1870
1871    RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1872  } else {
1873    SkipUntil(tok::r_brace, false, false);
1874  }
1875
1876  // If attributes exist after class contents, parse them.
1877  ParsedAttributes attrs(AttrFactory);
1878  MaybeParseGNUAttributes(attrs);
1879
1880  if (TagDecl)
1881    Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
1882                                              LBraceLoc, RBraceLoc,
1883                                              attrs.getList());
1884
1885  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1886  // complete within function bodies, default arguments,
1887  // exception-specifications, and constructor ctor-initializers (including
1888  // such things in nested classes).
1889  //
1890  // FIXME: Only function bodies and constructor ctor-initializers are
1891  // parsed correctly, fix the rest.
1892  if (TagDecl && NonNestedClass) {
1893    // We are not inside a nested class. This class and its nested classes
1894    // are complete and we can parse the delayed portions of method
1895    // declarations and the lexed inline method definitions.
1896    SourceLocation SavedPrevTokLocation = PrevTokLocation;
1897    ParseLexedMethodDeclarations(getCurrentClass());
1898    ParseLexedMethodDefs(getCurrentClass());
1899    PrevTokLocation = SavedPrevTokLocation;
1900  }
1901
1902  if (TagDecl)
1903    Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc);
1904
1905  // Leave the class scope.
1906  ParsingDef.Pop();
1907  ClassScope.Exit();
1908}
1909
1910/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1911/// which explicitly initializes the members or base classes of a
1912/// class (C++ [class.base.init]). For example, the three initializers
1913/// after the ':' in the Derived constructor below:
1914///
1915/// @code
1916/// class Base { };
1917/// class Derived : Base {
1918///   int x;
1919///   float f;
1920/// public:
1921///   Derived(float f) : Base(), x(17), f(f) { }
1922/// };
1923/// @endcode
1924///
1925/// [C++]  ctor-initializer:
1926///          ':' mem-initializer-list
1927///
1928/// [C++]  mem-initializer-list:
1929///          mem-initializer ...[opt]
1930///          mem-initializer ...[opt] , mem-initializer-list
1931void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
1932  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1933
1934  // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
1935  PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1936  SourceLocation ColonLoc = ConsumeToken();
1937
1938  llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers;
1939  bool AnyErrors = false;
1940
1941  do {
1942    if (Tok.is(tok::code_completion)) {
1943      Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
1944                                                 MemInitializers.data(),
1945                                                 MemInitializers.size());
1946      ConsumeCodeCompletionToken();
1947    } else {
1948      MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1949      if (!MemInit.isInvalid())
1950        MemInitializers.push_back(MemInit.get());
1951      else
1952        AnyErrors = true;
1953    }
1954
1955    if (Tok.is(tok::comma))
1956      ConsumeToken();
1957    else if (Tok.is(tok::l_brace))
1958      break;
1959    // If the next token looks like a base or member initializer, assume that
1960    // we're just missing a comma.
1961    else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
1962      SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
1963      Diag(Loc, diag::err_ctor_init_missing_comma)
1964        << FixItHint::CreateInsertion(Loc, ", ");
1965    } else {
1966      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1967      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1968      SkipUntil(tok::l_brace, true, true);
1969      break;
1970    }
1971  } while (true);
1972
1973  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1974                               MemInitializers.data(), MemInitializers.size(),
1975                               AnyErrors);
1976}
1977
1978/// ParseMemInitializer - Parse a C++ member initializer, which is
1979/// part of a constructor initializer that explicitly initializes one
1980/// member or base class (C++ [class.base.init]). See
1981/// ParseConstructorInitializer for an example.
1982///
1983/// [C++] mem-initializer:
1984///         mem-initializer-id '(' expression-list[opt] ')'
1985///
1986/// [C++] mem-initializer-id:
1987///         '::'[opt] nested-name-specifier[opt] class-name
1988///         identifier
1989Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
1990  // parse '::'[opt] nested-name-specifier[opt]
1991  CXXScopeSpec SS;
1992  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1993  ParsedType TemplateTypeTy;
1994  if (Tok.is(tok::annot_template_id)) {
1995    TemplateIdAnnotation *TemplateId
1996      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1997    if (TemplateId->Kind == TNK_Type_template ||
1998        TemplateId->Kind == TNK_Dependent_template_name) {
1999      AnnotateTemplateIdTokenAsType();
2000      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2001      TemplateTypeTy = getTypeAnnotation(Tok);
2002    }
2003  }
2004  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
2005    Diag(Tok, diag::err_expected_member_or_base_name);
2006    return true;
2007  }
2008
2009  // Get the identifier. This may be a member name or a class name,
2010  // but we'll let the semantic analysis determine which it is.
2011  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
2012  SourceLocation IdLoc = ConsumeToken();
2013
2014  // Parse the '('.
2015  if (Tok.isNot(tok::l_paren)) {
2016    Diag(Tok, diag::err_expected_lparen);
2017    return true;
2018  }
2019  SourceLocation LParenLoc = ConsumeParen();
2020
2021  // Parse the optional expression-list.
2022  ExprVector ArgExprs(Actions);
2023  CommaLocsTy CommaLocs;
2024  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2025    SkipUntil(tok::r_paren);
2026    return true;
2027  }
2028
2029  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2030
2031  SourceLocation EllipsisLoc;
2032  if (Tok.is(tok::ellipsis))
2033    EllipsisLoc = ConsumeToken();
2034
2035  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2036                                     TemplateTypeTy, IdLoc,
2037                                     LParenLoc, ArgExprs.take(),
2038                                     ArgExprs.size(), RParenLoc,
2039                                     EllipsisLoc);
2040}
2041
2042/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2043///
2044///       exception-specification:
2045///         dynamic-exception-specification
2046///         noexcept-specification
2047///
2048///       noexcept-specification:
2049///         'noexcept'
2050///         'noexcept' '(' constant-expression ')'
2051ExceptionSpecificationType
2052Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange,
2053                    llvm::SmallVectorImpl<ParsedType> &DynamicExceptions,
2054                    llvm::SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2055                    ExprResult &NoexceptExpr) {
2056  ExceptionSpecificationType Result = EST_None;
2057
2058  // See if there's a dynamic specification.
2059  if (Tok.is(tok::kw_throw)) {
2060    Result = ParseDynamicExceptionSpecification(SpecificationRange,
2061                                                DynamicExceptions,
2062                                                DynamicExceptionRanges);
2063    assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2064           "Produced different number of exception types and ranges.");
2065  }
2066
2067  // If there's no noexcept specification, we're done.
2068  if (Tok.isNot(tok::kw_noexcept))
2069    return Result;
2070
2071  // If we already had a dynamic specification, parse the noexcept for,
2072  // recovery, but emit a diagnostic and don't store the results.
2073  SourceRange NoexceptRange;
2074  ExceptionSpecificationType NoexceptType = EST_None;
2075
2076  SourceLocation KeywordLoc = ConsumeToken();
2077  if (Tok.is(tok::l_paren)) {
2078    // There is an argument.
2079    SourceLocation LParenLoc = ConsumeParen();
2080    NoexceptType = EST_ComputedNoexcept;
2081    NoexceptExpr = ParseConstantExpression();
2082    // The argument must be contextually convertible to bool. We use
2083    // ActOnBooleanCondition for this purpose.
2084    if (!NoexceptExpr.isInvalid())
2085      NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2086                                                   NoexceptExpr.get());
2087    SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2088    NoexceptRange = SourceRange(KeywordLoc, RParenLoc);
2089  } else {
2090    // There is no argument.
2091    NoexceptType = EST_BasicNoexcept;
2092    NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2093  }
2094
2095  if (Result == EST_None) {
2096    SpecificationRange = NoexceptRange;
2097    Result = NoexceptType;
2098
2099    // If there's a dynamic specification after a noexcept specification,
2100    // parse that and ignore the results.
2101    if (Tok.is(tok::kw_throw)) {
2102      Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2103      ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2104                                         DynamicExceptionRanges);
2105    }
2106  } else {
2107    Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2108  }
2109
2110  return Result;
2111}
2112
2113/// ParseDynamicExceptionSpecification - Parse a C++
2114/// dynamic-exception-specification (C++ [except.spec]).
2115///
2116///       dynamic-exception-specification:
2117///         'throw' '(' type-id-list [opt] ')'
2118/// [MS]    'throw' '(' '...' ')'
2119///
2120///       type-id-list:
2121///         type-id ... [opt]
2122///         type-id-list ',' type-id ... [opt]
2123///
2124ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2125                                  SourceRange &SpecificationRange,
2126                                  llvm::SmallVectorImpl<ParsedType> &Exceptions,
2127                                  llvm::SmallVectorImpl<SourceRange> &Ranges) {
2128  assert(Tok.is(tok::kw_throw) && "expected throw");
2129
2130  SpecificationRange.setBegin(ConsumeToken());
2131
2132  if (!Tok.is(tok::l_paren)) {
2133    Diag(Tok, diag::err_expected_lparen_after) << "throw";
2134    SpecificationRange.setEnd(SpecificationRange.getBegin());
2135    return EST_DynamicNone;
2136  }
2137  SourceLocation LParenLoc = ConsumeParen();
2138
2139  // Parse throw(...), a Microsoft extension that means "this function
2140  // can throw anything".
2141  if (Tok.is(tok::ellipsis)) {
2142    SourceLocation EllipsisLoc = ConsumeToken();
2143    if (!getLang().Microsoft)
2144      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2145    SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2146    SpecificationRange.setEnd(RParenLoc);
2147    return EST_MSAny;
2148  }
2149
2150  // Parse the sequence of type-ids.
2151  SourceRange Range;
2152  while (Tok.isNot(tok::r_paren)) {
2153    TypeResult Res(ParseTypeName(&Range));
2154
2155    if (Tok.is(tok::ellipsis)) {
2156      // C++0x [temp.variadic]p5:
2157      //   - In a dynamic-exception-specification (15.4); the pattern is a
2158      //     type-id.
2159      SourceLocation Ellipsis = ConsumeToken();
2160      Range.setEnd(Ellipsis);
2161      if (!Res.isInvalid())
2162        Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2163    }
2164
2165    if (!Res.isInvalid()) {
2166      Exceptions.push_back(Res.get());
2167      Ranges.push_back(Range);
2168    }
2169
2170    if (Tok.is(tok::comma))
2171      ConsumeToken();
2172    else
2173      break;
2174  }
2175
2176  SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc));
2177  return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
2178}
2179
2180/// ParseTrailingReturnType - Parse a trailing return type on a new-style
2181/// function declaration.
2182TypeResult Parser::ParseTrailingReturnType() {
2183  assert(Tok.is(tok::arrow) && "expected arrow");
2184
2185  ConsumeToken();
2186
2187  // FIXME: Need to suppress declarations when parsing this typename.
2188  // Otherwise in this function definition:
2189  //
2190  //   auto f() -> struct X {}
2191  //
2192  // struct X is parsed as class definition because of the trailing
2193  // brace.
2194
2195  SourceRange Range;
2196  return ParseTypeName(&Range);
2197}
2198
2199/// \brief We have just started parsing the definition of a new class,
2200/// so push that class onto our stack of classes that is currently
2201/// being parsed.
2202Sema::ParsingClassState
2203Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
2204  assert((NonNestedClass || !ClassStack.empty()) &&
2205         "Nested class without outer class");
2206  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
2207  return Actions.PushParsingClass();
2208}
2209
2210/// \brief Deallocate the given parsed class and all of its nested
2211/// classes.
2212void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
2213  for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
2214    delete Class->LateParsedDeclarations[I];
2215  delete Class;
2216}
2217
2218/// \brief Pop the top class of the stack of classes that are
2219/// currently being parsed.
2220///
2221/// This routine should be called when we have finished parsing the
2222/// definition of a class, but have not yet popped the Scope
2223/// associated with the class's definition.
2224///
2225/// \returns true if the class we've popped is a top-level class,
2226/// false otherwise.
2227void Parser::PopParsingClass(Sema::ParsingClassState state) {
2228  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
2229
2230  Actions.PopParsingClass(state);
2231
2232  ParsingClass *Victim = ClassStack.top();
2233  ClassStack.pop();
2234  if (Victim->TopLevelClass) {
2235    // Deallocate all of the nested classes of this class,
2236    // recursively: we don't need to keep any of this information.
2237    DeallocateParsedClasses(Victim);
2238    return;
2239  }
2240  assert(!ClassStack.empty() && "Missing top-level class?");
2241
2242  if (Victim->LateParsedDeclarations.empty()) {
2243    // The victim is a nested class, but we will not need to perform
2244    // any processing after the definition of this class since it has
2245    // no members whose handling was delayed. Therefore, we can just
2246    // remove this nested class.
2247    DeallocateParsedClasses(Victim);
2248    return;
2249  }
2250
2251  // This nested class has some members that will need to be processed
2252  // after the top-level class is completely defined. Therefore, add
2253  // it to the list of nested classes within its parent.
2254  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
2255  ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
2256  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
2257}
2258
2259/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
2260/// parses standard attributes.
2261///
2262/// [C++0x] attribute-specifier:
2263///         '[' '[' attribute-list ']' ']'
2264///
2265/// [C++0x] attribute-list:
2266///         attribute[opt]
2267///         attribute-list ',' attribute[opt]
2268///
2269/// [C++0x] attribute:
2270///         attribute-token attribute-argument-clause[opt]
2271///
2272/// [C++0x] attribute-token:
2273///         identifier
2274///         attribute-scoped-token
2275///
2276/// [C++0x] attribute-scoped-token:
2277///         attribute-namespace '::' identifier
2278///
2279/// [C++0x] attribute-namespace:
2280///         identifier
2281///
2282/// [C++0x] attribute-argument-clause:
2283///         '(' balanced-token-seq ')'
2284///
2285/// [C++0x] balanced-token-seq:
2286///         balanced-token
2287///         balanced-token-seq balanced-token
2288///
2289/// [C++0x] balanced-token:
2290///         '(' balanced-token-seq ')'
2291///         '[' balanced-token-seq ']'
2292///         '{' balanced-token-seq '}'
2293///         any token but '(', ')', '[', ']', '{', or '}'
2294void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs,
2295                                  SourceLocation *endLoc) {
2296  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
2297      && "Not a C++0x attribute list");
2298
2299  SourceLocation StartLoc = Tok.getLocation(), Loc;
2300
2301  ConsumeBracket();
2302  ConsumeBracket();
2303
2304  if (Tok.is(tok::comma)) {
2305    Diag(Tok.getLocation(), diag::err_expected_ident);
2306    ConsumeToken();
2307  }
2308
2309  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
2310    // attribute not present
2311    if (Tok.is(tok::comma)) {
2312      ConsumeToken();
2313      continue;
2314    }
2315
2316    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
2317    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
2318
2319    // scoped attribute
2320    if (Tok.is(tok::coloncolon)) {
2321      ConsumeToken();
2322
2323      if (!Tok.is(tok::identifier)) {
2324        Diag(Tok.getLocation(), diag::err_expected_ident);
2325        SkipUntil(tok::r_square, tok::comma, true, true);
2326        continue;
2327      }
2328
2329      ScopeName = AttrName;
2330      ScopeLoc = AttrLoc;
2331
2332      AttrName = Tok.getIdentifierInfo();
2333      AttrLoc = ConsumeToken();
2334    }
2335
2336    bool AttrParsed = false;
2337    // No scoped names are supported; ideally we could put all non-standard
2338    // attributes into namespaces.
2339    if (!ScopeName) {
2340      switch(AttributeList::getKind(AttrName))
2341      {
2342      // No arguments
2343      case AttributeList::AT_carries_dependency:
2344      case AttributeList::AT_noreturn: {
2345        if (Tok.is(tok::l_paren)) {
2346          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
2347            << AttrName->getName();
2348          break;
2349        }
2350
2351        attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0,
2352                     SourceLocation(), 0, 0, false, true);
2353        AttrParsed = true;
2354        break;
2355      }
2356
2357      // One argument; must be a type-id or assignment-expression
2358      case AttributeList::AT_aligned: {
2359        if (Tok.isNot(tok::l_paren)) {
2360          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
2361            << AttrName->getName();
2362          break;
2363        }
2364        SourceLocation ParamLoc = ConsumeParen();
2365
2366        ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
2367
2368        MatchRHSPunctuation(tok::r_paren, ParamLoc);
2369
2370        ExprVector ArgExprs(Actions);
2371        ArgExprs.push_back(ArgExpr.release());
2372        attrs.addNew(AttrName, AttrLoc, 0, AttrLoc,
2373                     0, ParamLoc, ArgExprs.take(), 1,
2374                     false, true);
2375
2376        AttrParsed = true;
2377        break;
2378      }
2379
2380      // Silence warnings
2381      default: break;
2382      }
2383    }
2384
2385    // Skip the entire parameter clause, if any
2386    if (!AttrParsed && Tok.is(tok::l_paren)) {
2387      ConsumeParen();
2388      // SkipUntil maintains the balancedness of tokens.
2389      SkipUntil(tok::r_paren, false);
2390    }
2391  }
2392
2393  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2394    SkipUntil(tok::r_square, false);
2395  Loc = Tok.getLocation();
2396  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2397    SkipUntil(tok::r_square, false);
2398
2399  attrs.Range = SourceRange(StartLoc, Loc);
2400}
2401
2402/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
2403/// attribute.
2404///
2405/// FIXME: Simply returns an alignof() expression if the argument is a
2406/// type. Ideally, the type should be propagated directly into Sema.
2407///
2408/// [C++0x] 'align' '(' type-id ')'
2409/// [C++0x] 'align' '(' assignment-expression ')'
2410ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2411  if (isTypeIdInParens()) {
2412    EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
2413    SourceLocation TypeLoc = Tok.getLocation();
2414    ParsedType Ty = ParseTypeName().get();
2415    SourceRange TypeRange(Start, Tok.getLocation());
2416    return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true,
2417                                                Ty.getAsOpaquePtr(), TypeRange);
2418  } else
2419    return ParseConstantExpression();
2420}
2421
2422/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
2423///
2424/// [MS] ms-attribute:
2425///             '[' token-seq ']'
2426///
2427/// [MS] ms-attribute-seq:
2428///             ms-attribute[opt]
2429///             ms-attribute ms-attribute-seq
2430void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
2431                                      SourceLocation *endLoc) {
2432  assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
2433
2434  while (Tok.is(tok::l_square)) {
2435    ConsumeBracket();
2436    SkipUntil(tok::r_square, true, true);
2437    if (endLoc) *endLoc = Tok.getLocation();
2438    ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
2439  }
2440}
2441