ParseDeclCXX.cpp revision 21d53e179651657e243587b79234fe6fedfae71c 
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/Parse/DeclSpec.h"
18#include "clang/Parse/Scope.h"
19#include "clang/Parse/Template.h"
20#include "RAIIObjectsForParser.h"
21using namespace clang;
22
23/// ParseNamespace - We know that the current token is a namespace keyword. This
24/// may either be a top level namespace or a block-level namespace alias.
25///
26///       namespace-definition: [C++ 7.3: basic.namespace]
27///         named-namespace-definition
28///         unnamed-namespace-definition
29///
30///       unnamed-namespace-definition:
31///         'namespace' attributes[opt] '{' namespace-body '}'
32///
33///       named-namespace-definition:
34///         original-namespace-definition
35///         extension-namespace-definition
36///
37///       original-namespace-definition:
38///         'namespace' identifier attributes[opt] '{' namespace-body '}'
39///
40///       extension-namespace-definition:
41///         'namespace' original-namespace-name '{' namespace-body '}'
42///
43///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
44///         'namespace' identifier '=' qualified-namespace-specifier ';'
45///
46Parser::DeclPtrTy Parser::ParseNamespace(unsigned Context,
47                                         SourceLocation &DeclEnd) {
48  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
49  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
50
51  if (Tok.is(tok::code_completion)) {
52    Actions.CodeCompleteNamespaceDecl(CurScope);
53    ConsumeToken();
54  }
55
56  SourceLocation IdentLoc;
57  IdentifierInfo *Ident = 0;
58
59  Token attrTok;
60
61  if (Tok.is(tok::identifier)) {
62    Ident = Tok.getIdentifierInfo();
63    IdentLoc = ConsumeToken();  // eat the identifier.
64  }
65
66  // Read label attributes, if present.
67  llvm::OwningPtr<AttributeList> AttrList;
68  if (Tok.is(tok::kw___attribute)) {
69    attrTok = Tok;
70
71    // FIXME: save these somewhere.
72    AttrList.reset(ParseGNUAttributes());
73  }
74
75  if (Tok.is(tok::equal)) {
76    if (AttrList)
77      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
78
79    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
80  }
81
82  if (Tok.isNot(tok::l_brace)) {
83    Diag(Tok, Ident ? diag::err_expected_lbrace :
84         diag::err_expected_ident_lbrace);
85    return DeclPtrTy();
86  }
87
88  SourceLocation LBrace = ConsumeBrace();
89
90  // Enter a scope for the namespace.
91  ParseScope NamespaceScope(this, Scope::DeclScope);
92
93  DeclPtrTy NamespcDecl =
94    Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace,
95                                   AttrList.get());
96
97  PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
98                                        PP.getSourceManager(),
99                                        "parsing namespace");
100
101  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
102    CXX0XAttributeList Attr;
103    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
104      Attr = ParseCXX0XAttributes();
105    ParseExternalDeclaration(Attr);
106  }
107
108  // Leave the namespace scope.
109  NamespaceScope.Exit();
110
111  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
112  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
113
114  DeclEnd = RBraceLoc;
115  return NamespcDecl;
116}
117
118/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
119/// alias definition.
120///
121Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
122                                              SourceLocation AliasLoc,
123                                              IdentifierInfo *Alias,
124                                              SourceLocation &DeclEnd) {
125  assert(Tok.is(tok::equal) && "Not equal token");
126
127  ConsumeToken(); // eat the '='.
128
129  if (Tok.is(tok::code_completion)) {
130    Actions.CodeCompleteNamespaceAliasDecl(CurScope);
131    ConsumeToken();
132  }
133
134  CXXScopeSpec SS;
135  // Parse (optional) nested-name-specifier.
136  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
137
138  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
139    Diag(Tok, diag::err_expected_namespace_name);
140    // Skip to end of the definition and eat the ';'.
141    SkipUntil(tok::semi);
142    return DeclPtrTy();
143  }
144
145  // Parse identifier.
146  IdentifierInfo *Ident = Tok.getIdentifierInfo();
147  SourceLocation IdentLoc = ConsumeToken();
148
149  // Eat the ';'.
150  DeclEnd = Tok.getLocation();
151  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
152                   "", tok::semi);
153
154  return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias,
155                                        SS, IdentLoc, Ident);
156}
157
158/// ParseLinkage - We know that the current token is a string_literal
159/// and just before that, that extern was seen.
160///
161///       linkage-specification: [C++ 7.5p2: dcl.link]
162///         'extern' string-literal '{' declaration-seq[opt] '}'
163///         'extern' string-literal declaration
164///
165Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS,
166                                       unsigned Context) {
167  assert(Tok.is(tok::string_literal) && "Not a string literal!");
168  llvm::SmallVector<char, 8> LangBuffer;
169  // LangBuffer is guaranteed to be big enough.
170  llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer);
171
172  SourceLocation Loc = ConsumeStringToken();
173
174  ParseScope LinkageScope(this, Scope::DeclScope);
175  DeclPtrTy LinkageSpec
176    = Actions.ActOnStartLinkageSpecification(CurScope,
177                                             /*FIXME: */SourceLocation(),
178                                             Loc, Lang.data(), Lang.size(),
179                                       Tok.is(tok::l_brace)? Tok.getLocation()
180                                                           : SourceLocation());
181
182  CXX0XAttributeList Attr;
183  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
184    Attr = ParseCXX0XAttributes();
185  }
186
187  if (Tok.isNot(tok::l_brace)) {
188    ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList);
189    return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
190                                                   SourceLocation());
191  }
192
193  DS.abort();
194
195  if (Attr.HasAttr)
196    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
197      << Attr.Range;
198
199  SourceLocation LBrace = ConsumeBrace();
200  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
201    CXX0XAttributeList Attr;
202    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
203      Attr = ParseCXX0XAttributes();
204    ParseExternalDeclaration(Attr);
205  }
206
207  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
208  return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
209}
210
211/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
212/// using-directive. Assumes that current token is 'using'.
213Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
214                                                     SourceLocation &DeclEnd,
215                                                     CXX0XAttributeList Attr) {
216  assert(Tok.is(tok::kw_using) && "Not using token");
217
218  // Eat 'using'.
219  SourceLocation UsingLoc = ConsumeToken();
220
221  if (Tok.is(tok::code_completion)) {
222    Actions.CodeCompleteUsing(CurScope);
223    ConsumeToken();
224  }
225
226  if (Tok.is(tok::kw_namespace))
227    // Next token after 'using' is 'namespace' so it must be using-directive
228    return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
229
230  if (Attr.HasAttr)
231    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
232      << Attr.Range;
233
234  // Otherwise, it must be using-declaration.
235  // Ignore illegal attributes (the caller should already have issued an error.
236  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
237}
238
239/// ParseUsingDirective - Parse C++ using-directive, assumes
240/// that current token is 'namespace' and 'using' was already parsed.
241///
242///       using-directive: [C++ 7.3.p4: namespace.udir]
243///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
244///                 namespace-name ;
245/// [GNU] using-directive:
246///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
247///                 namespace-name attributes[opt] ;
248///
249Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
250                                              SourceLocation UsingLoc,
251                                              SourceLocation &DeclEnd,
252                                              AttributeList *Attr) {
253  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
254
255  // Eat 'namespace'.
256  SourceLocation NamespcLoc = ConsumeToken();
257
258  if (Tok.is(tok::code_completion)) {
259    Actions.CodeCompleteUsingDirective(CurScope);
260    ConsumeToken();
261  }
262
263  CXXScopeSpec SS;
264  // Parse (optional) nested-name-specifier.
265  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
266
267  IdentifierInfo *NamespcName = 0;
268  SourceLocation IdentLoc = SourceLocation();
269
270  // Parse namespace-name.
271  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
272    Diag(Tok, diag::err_expected_namespace_name);
273    // If there was invalid namespace name, skip to end of decl, and eat ';'.
274    SkipUntil(tok::semi);
275    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
276    return DeclPtrTy();
277  }
278
279  // Parse identifier.
280  NamespcName = Tok.getIdentifierInfo();
281  IdentLoc = ConsumeToken();
282
283  // Parse (optional) attributes (most likely GNU strong-using extension).
284  bool GNUAttr = false;
285  if (Tok.is(tok::kw___attribute)) {
286    GNUAttr = true;
287    Attr = addAttributeLists(Attr, ParseGNUAttributes());
288  }
289
290  // Eat ';'.
291  DeclEnd = Tok.getLocation();
292  ExpectAndConsume(tok::semi,
293                   GNUAttr ? diag::err_expected_semi_after_attribute_list :
294                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
295
296  return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
297                                      IdentLoc, NamespcName, Attr);
298}
299
300/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
301/// 'using' was already seen.
302///
303///     using-declaration: [C++ 7.3.p3: namespace.udecl]
304///       'using' 'typename'[opt] ::[opt] nested-name-specifier
305///               unqualified-id
306///       'using' :: unqualified-id
307///
308Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
309                                                SourceLocation UsingLoc,
310                                                SourceLocation &DeclEnd,
311                                                AccessSpecifier AS) {
312  CXXScopeSpec SS;
313  SourceLocation TypenameLoc;
314  bool IsTypeName;
315
316  // Ignore optional 'typename'.
317  // FIXME: This is wrong; we should parse this as a typename-specifier.
318  if (Tok.is(tok::kw_typename)) {
319    TypenameLoc = Tok.getLocation();
320    ConsumeToken();
321    IsTypeName = true;
322  }
323  else
324    IsTypeName = false;
325
326  // Parse nested-name-specifier.
327  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
328
329  // Check nested-name specifier.
330  if (SS.isInvalid()) {
331    SkipUntil(tok::semi);
332    return DeclPtrTy();
333  }
334
335  // Parse the unqualified-id. We allow parsing of both constructor and
336  // destructor names and allow the action module to diagnose any semantic
337  // errors.
338  UnqualifiedId Name;
339  if (ParseUnqualifiedId(SS,
340                         /*EnteringContext=*/false,
341                         /*AllowDestructorName=*/true,
342                         /*AllowConstructorName=*/true,
343                         /*ObjectType=*/0,
344                         Name)) {
345    SkipUntil(tok::semi);
346    return DeclPtrTy();
347  }
348
349  // Parse (optional) attributes (most likely GNU strong-using extension).
350  llvm::OwningPtr<AttributeList> AttrList;
351  if (Tok.is(tok::kw___attribute))
352    AttrList.reset(ParseGNUAttributes());
353
354  // Eat ';'.
355  DeclEnd = Tok.getLocation();
356  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
357                   AttrList ? "attributes list" : "using declaration",
358                   tok::semi);
359
360  return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name,
361                                       AttrList.get(), IsTypeName, TypenameLoc);
362}
363
364/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
365///
366///      static_assert-declaration:
367///        static_assert ( constant-expression  ,  string-literal  ) ;
368///
369Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
370  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
371  SourceLocation StaticAssertLoc = ConsumeToken();
372
373  if (Tok.isNot(tok::l_paren)) {
374    Diag(Tok, diag::err_expected_lparen);
375    return DeclPtrTy();
376  }
377
378  SourceLocation LParenLoc = ConsumeParen();
379
380  OwningExprResult AssertExpr(ParseConstantExpression());
381  if (AssertExpr.isInvalid()) {
382    SkipUntil(tok::semi);
383    return DeclPtrTy();
384  }
385
386  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
387    return DeclPtrTy();
388
389  if (Tok.isNot(tok::string_literal)) {
390    Diag(Tok, diag::err_expected_string_literal);
391    SkipUntil(tok::semi);
392    return DeclPtrTy();
393  }
394
395  OwningExprResult AssertMessage(ParseStringLiteralExpression());
396  if (AssertMessage.isInvalid())
397    return DeclPtrTy();
398
399  MatchRHSPunctuation(tok::r_paren, LParenLoc);
400
401  DeclEnd = Tok.getLocation();
402  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
403
404  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
405                                              move(AssertMessage));
406}
407
408/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
409///
410/// 'decltype' ( expression )
411///
412void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
413  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
414
415  SourceLocation StartLoc = ConsumeToken();
416  SourceLocation LParenLoc = Tok.getLocation();
417
418  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
419                       "decltype")) {
420    SkipUntil(tok::r_paren);
421    return;
422  }
423
424  // Parse the expression
425
426  // C++0x [dcl.type.simple]p4:
427  //   The operand of the decltype specifier is an unevaluated operand.
428  EnterExpressionEvaluationContext Unevaluated(Actions,
429                                               Action::Unevaluated);
430  OwningExprResult Result = ParseExpression();
431  if (Result.isInvalid()) {
432    SkipUntil(tok::r_paren);
433    return;
434  }
435
436  // Match the ')'
437  SourceLocation RParenLoc;
438  if (Tok.is(tok::r_paren))
439    RParenLoc = ConsumeParen();
440  else
441    MatchRHSPunctuation(tok::r_paren, LParenLoc);
442
443  if (RParenLoc.isInvalid())
444    return;
445
446  const char *PrevSpec = 0;
447  unsigned DiagID;
448  // Check for duplicate type specifiers (e.g. "int decltype(a)").
449  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
450                         DiagID, Result.release()))
451    Diag(StartLoc, DiagID) << PrevSpec;
452}
453
454/// ParseClassName - Parse a C++ class-name, which names a class. Note
455/// that we only check that the result names a type; semantic analysis
456/// will need to verify that the type names a class. The result is
457/// either a type or NULL, depending on whether a type name was
458/// found.
459///
460///       class-name: [C++ 9.1]
461///         identifier
462///         simple-template-id
463///
464Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
465                                          const CXXScopeSpec *SS) {
466  // Check whether we have a template-id that names a type.
467  if (Tok.is(tok::annot_template_id)) {
468    TemplateIdAnnotation *TemplateId
469      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
470    if (TemplateId->Kind == TNK_Type_template ||
471        TemplateId->Kind == TNK_Dependent_template_name) {
472      AnnotateTemplateIdTokenAsType(SS);
473
474      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
475      TypeTy *Type = Tok.getAnnotationValue();
476      EndLocation = Tok.getAnnotationEndLoc();
477      ConsumeToken();
478
479      if (Type)
480        return Type;
481      return true;
482    }
483
484    // Fall through to produce an error below.
485  }
486
487  if (Tok.isNot(tok::identifier)) {
488    Diag(Tok, diag::err_expected_class_name);
489    return true;
490  }
491
492  IdentifierInfo *Id = Tok.getIdentifierInfo();
493  SourceLocation IdLoc = ConsumeToken();
494
495  if (Tok.is(tok::less)) {
496    // It looks the user intended to write a template-id here, but the
497    // template-name was wrong. Try to fix that.
498    TemplateNameKind TNK = TNK_Type_template;
499    TemplateTy Template;
500    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, CurScope,
501                                             SS, Template, TNK)) {
502      Diag(IdLoc, diag::err_unknown_template_name)
503        << Id;
504    }
505
506    if (!Template)
507      return true;
508
509    // Form the template name
510    UnqualifiedId TemplateName;
511    TemplateName.setIdentifier(Id, IdLoc);
512
513    // Parse the full template-id, then turn it into a type.
514    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
515                                SourceLocation(), true))
516      return true;
517    if (TNK == TNK_Dependent_template_name)
518      AnnotateTemplateIdTokenAsType(SS);
519
520    // If we didn't end up with a typename token, there's nothing more we
521    // can do.
522    if (Tok.isNot(tok::annot_typename))
523      return true;
524
525    // Retrieve the type from the annotation token, consume that token, and
526    // return.
527    EndLocation = Tok.getAnnotationEndLoc();
528    TypeTy *Type = Tok.getAnnotationValue();
529    ConsumeToken();
530    return Type;
531  }
532
533  // We have an identifier; check whether it is actually a type.
534  TypeTy *Type = Actions.getTypeName(*Id, IdLoc, CurScope, SS, true);
535  if (!Type) {
536    Diag(IdLoc, diag::err_expected_class_name);
537    return true;
538  }
539
540  // Consume the identifier.
541  EndLocation = IdLoc;
542  return Type;
543}
544
545/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
546/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
547/// until we reach the start of a definition or see a token that
548/// cannot start a definition. If SuppressDeclarations is true, we do know.
549///
550///       class-specifier: [C++ class]
551///         class-head '{' member-specification[opt] '}'
552///         class-head '{' member-specification[opt] '}' attributes[opt]
553///       class-head:
554///         class-key identifier[opt] base-clause[opt]
555///         class-key nested-name-specifier identifier base-clause[opt]
556///         class-key nested-name-specifier[opt] simple-template-id
557///                          base-clause[opt]
558/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
559/// [GNU]   class-key attributes[opt] nested-name-specifier
560///                          identifier base-clause[opt]
561/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
562///                          simple-template-id base-clause[opt]
563///       class-key:
564///         'class'
565///         'struct'
566///         'union'
567///
568///       elaborated-type-specifier: [C++ dcl.type.elab]
569///         class-key ::[opt] nested-name-specifier[opt] identifier
570///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
571///                          simple-template-id
572///
573///  Note that the C++ class-specifier and elaborated-type-specifier,
574///  together, subsume the C99 struct-or-union-specifier:
575///
576///       struct-or-union-specifier: [C99 6.7.2.1]
577///         struct-or-union identifier[opt] '{' struct-contents '}'
578///         struct-or-union identifier
579/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
580///                                                         '}' attributes[opt]
581/// [GNU]   struct-or-union attributes[opt] identifier
582///       struct-or-union:
583///         'struct'
584///         'union'
585void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
586                                 SourceLocation StartLoc, DeclSpec &DS,
587                                 const ParsedTemplateInfo &TemplateInfo,
588                                 AccessSpecifier AS, bool SuppressDeclarations){
589  DeclSpec::TST TagType;
590  if (TagTokKind == tok::kw_struct)
591    TagType = DeclSpec::TST_struct;
592  else if (TagTokKind == tok::kw_class)
593    TagType = DeclSpec::TST_class;
594  else {
595    assert(TagTokKind == tok::kw_union && "Not a class specifier");
596    TagType = DeclSpec::TST_union;
597  }
598
599  if (Tok.is(tok::code_completion)) {
600    // Code completion for a struct, class, or union name.
601    Actions.CodeCompleteTag(CurScope, TagType);
602    ConsumeToken();
603  }
604
605  AttributeList *AttrList = 0;
606  // If attributes exist after tag, parse them.
607  if (Tok.is(tok::kw___attribute))
608    AttrList = ParseGNUAttributes();
609
610  // If declspecs exist after tag, parse them.
611  if (Tok.is(tok::kw___declspec))
612    AttrList = ParseMicrosoftDeclSpec(AttrList);
613
614  // If C++0x attributes exist here, parse them.
615  // FIXME: Are we consistent with the ordering of parsing of different
616  // styles of attributes?
617  if (isCXX0XAttributeSpecifier())
618    AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
619
620  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
621    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
622    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
623    // token sequence "struct __is_pod", make __is_pod into a normal
624    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
625    // properly.
626    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
627    Tok.setKind(tok::identifier);
628  }
629
630  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
631    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
632    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
633    // token sequence "struct __is_empty", make __is_empty into a normal
634    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
635    // properly.
636    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
637    Tok.setKind(tok::identifier);
638  }
639
640  // Parse the (optional) nested-name-specifier.
641  CXXScopeSpec &SS = DS.getTypeSpecScope();
642  if (getLang().CPlusPlus) {
643    // "FOO : BAR" is not a potential typo for "FOO::BAR".
644    ColonProtectionRAIIObject X(*this);
645
646    ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true);
647    if (SS.isSet())
648      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
649        Diag(Tok, diag::err_expected_ident);
650  }
651
652  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
653
654  // Parse the (optional) class name or simple-template-id.
655  IdentifierInfo *Name = 0;
656  SourceLocation NameLoc;
657  TemplateIdAnnotation *TemplateId = 0;
658  if (Tok.is(tok::identifier)) {
659    Name = Tok.getIdentifierInfo();
660    NameLoc = ConsumeToken();
661
662    if (Tok.is(tok::less)) {
663      // The name was supposed to refer to a template, but didn't.
664      // Eat the template argument list and try to continue parsing this as
665      // a class (or template thereof).
666      TemplateArgList TemplateArgs;
667      SourceLocation LAngleLoc, RAngleLoc;
668      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
669                                           true, LAngleLoc,
670                                           TemplateArgs, RAngleLoc)) {
671        // We couldn't parse the template argument list at all, so don't
672        // try to give any location information for the list.
673        LAngleLoc = RAngleLoc = SourceLocation();
674      }
675
676      Diag(NameLoc, diag::err_explicit_spec_non_template)
677        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
678        << (TagType == DeclSpec::TST_class? 0
679            : TagType == DeclSpec::TST_struct? 1
680            : 2)
681        << Name
682        << SourceRange(LAngleLoc, RAngleLoc);
683
684      // Strip off the last template parameter list if it was empty, since
685      // we've removed its template argument list.
686      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
687        if (TemplateParams && TemplateParams->size() > 1) {
688          TemplateParams->pop_back();
689        } else {
690          TemplateParams = 0;
691          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
692            = ParsedTemplateInfo::NonTemplate;
693        }
694      } else if (TemplateInfo.Kind
695                                == ParsedTemplateInfo::ExplicitInstantiation) {
696        // Pretend this is just a forward declaration.
697        TemplateParams = 0;
698        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
699          = ParsedTemplateInfo::NonTemplate;
700        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
701          = SourceLocation();
702        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
703          = SourceLocation();
704      }
705
706
707    }
708  } else if (Tok.is(tok::annot_template_id)) {
709    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
710    NameLoc = ConsumeToken();
711
712    if (TemplateId->Kind != TNK_Type_template) {
713      // The template-name in the simple-template-id refers to
714      // something other than a class template. Give an appropriate
715      // error message and skip to the ';'.
716      SourceRange Range(NameLoc);
717      if (SS.isNotEmpty())
718        Range.setBegin(SS.getBeginLoc());
719
720      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
721        << Name << static_cast<int>(TemplateId->Kind) << Range;
722
723      DS.SetTypeSpecError();
724      SkipUntil(tok::semi, false, true);
725      TemplateId->Destroy();
726      return;
727    }
728  }
729
730  // There are four options here.  If we have 'struct foo;', then this
731  // is either a forward declaration or a friend declaration, which
732  // have to be treated differently.  If we have 'struct foo {...' or
733  // 'struct foo :...' then this is a definition. Otherwise we have
734  // something like 'struct foo xyz', a reference.
735  // However, in some contexts, things look like declarations but are just
736  // references, e.g.
737  // new struct s;
738  // or
739  // &T::operator struct s;
740  // For these, SuppressDeclarations is true.
741  Action::TagUseKind TUK;
742  if (SuppressDeclarations)
743    TUK = Action::TUK_Reference;
744  else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
745    if (DS.isFriendSpecified()) {
746      // C++ [class.friend]p2:
747      //   A class shall not be defined in a friend declaration.
748      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
749        << SourceRange(DS.getFriendSpecLoc());
750
751      // Skip everything up to the semicolon, so that this looks like a proper
752      // friend class (or template thereof) declaration.
753      SkipUntil(tok::semi, true, true);
754      TUK = Action::TUK_Friend;
755    } else {
756      // Okay, this is a class definition.
757      TUK = Action::TUK_Definition;
758    }
759  } else if (Tok.is(tok::semi))
760    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
761  else
762    TUK = Action::TUK_Reference;
763
764  if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
765    // We have a declaration or reference to an anonymous class.
766    Diag(StartLoc, diag::err_anon_type_definition)
767      << DeclSpec::getSpecifierName(TagType);
768
769    SkipUntil(tok::comma, true);
770
771    if (TemplateId)
772      TemplateId->Destroy();
773    return;
774  }
775
776  // Create the tag portion of the class or class template.
777  Action::DeclResult TagOrTempResult = true; // invalid
778  Action::TypeResult TypeResult = true; // invalid
779
780  // FIXME: When TUK == TUK_Reference and we have a template-id, we need
781  // to turn that template-id into a type.
782
783  bool Owned = false;
784  if (TemplateId) {
785    // Explicit specialization, class template partial specialization,
786    // or explicit instantiation.
787    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
788                                       TemplateId->getTemplateArgs(),
789                                       TemplateId->NumArgs);
790    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
791        TUK == Action::TUK_Declaration) {
792      // This is an explicit instantiation of a class template.
793      TagOrTempResult
794        = Actions.ActOnExplicitInstantiation(CurScope,
795                                             TemplateInfo.ExternLoc,
796                                             TemplateInfo.TemplateLoc,
797                                             TagType,
798                                             StartLoc,
799                                             SS,
800                                     TemplateTy::make(TemplateId->Template),
801                                             TemplateId->TemplateNameLoc,
802                                             TemplateId->LAngleLoc,
803                                             TemplateArgsPtr,
804                                             TemplateId->RAngleLoc,
805                                             AttrList);
806    } else if (TUK == Action::TUK_Reference) {
807      TypeResult
808        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
809                                      TemplateId->TemplateNameLoc,
810                                      TemplateId->LAngleLoc,
811                                      TemplateArgsPtr,
812                                      TemplateId->RAngleLoc);
813
814      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
815                                                  TagType, StartLoc);
816    } else {
817      // This is an explicit specialization or a class template
818      // partial specialization.
819      TemplateParameterLists FakedParamLists;
820
821      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
822        // This looks like an explicit instantiation, because we have
823        // something like
824        //
825        //   template class Foo<X>
826        //
827        // but it actually has a definition. Most likely, this was
828        // meant to be an explicit specialization, but the user forgot
829        // the '<>' after 'template'.
830        assert(TUK == Action::TUK_Definition && "Expected a definition here");
831
832        SourceLocation LAngleLoc
833          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
834        Diag(TemplateId->TemplateNameLoc,
835             diag::err_explicit_instantiation_with_definition)
836          << SourceRange(TemplateInfo.TemplateLoc)
837          << CodeModificationHint::CreateInsertion(LAngleLoc, "<>");
838
839        // Create a fake template parameter list that contains only
840        // "template<>", so that we treat this construct as a class
841        // template specialization.
842        FakedParamLists.push_back(
843          Actions.ActOnTemplateParameterList(0, SourceLocation(),
844                                             TemplateInfo.TemplateLoc,
845                                             LAngleLoc,
846                                             0, 0,
847                                             LAngleLoc));
848        TemplateParams = &FakedParamLists;
849      }
850
851      // Build the class template specialization.
852      TagOrTempResult
853        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
854                       StartLoc, SS,
855                       TemplateTy::make(TemplateId->Template),
856                       TemplateId->TemplateNameLoc,
857                       TemplateId->LAngleLoc,
858                       TemplateArgsPtr,
859                       TemplateId->RAngleLoc,
860                       AttrList,
861                       Action::MultiTemplateParamsArg(Actions,
862                                    TemplateParams? &(*TemplateParams)[0] : 0,
863                                 TemplateParams? TemplateParams->size() : 0));
864    }
865    TemplateId->Destroy();
866  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
867             TUK == Action::TUK_Declaration) {
868    // Explicit instantiation of a member of a class template
869    // specialization, e.g.,
870    //
871    //   template struct Outer<int>::Inner;
872    //
873    TagOrTempResult
874      = Actions.ActOnExplicitInstantiation(CurScope,
875                                           TemplateInfo.ExternLoc,
876                                           TemplateInfo.TemplateLoc,
877                                           TagType, StartLoc, SS, Name,
878                                           NameLoc, AttrList);
879  } else {
880    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
881        TUK == Action::TUK_Definition) {
882      // FIXME: Diagnose this particular error.
883    }
884
885    bool IsDependent = false;
886
887    // Declaration or definition of a class type
888    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
889                                       Name, NameLoc, AttrList, AS,
890                                  Action::MultiTemplateParamsArg(Actions,
891                                    TemplateParams? &(*TemplateParams)[0] : 0,
892                                    TemplateParams? TemplateParams->size() : 0),
893                                       Owned, IsDependent);
894
895    // If ActOnTag said the type was dependent, try again with the
896    // less common call.
897    if (IsDependent)
898      TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
899                                             SS, Name, StartLoc, NameLoc);
900  }
901
902  // If there is a body, parse it and inform the actions module.
903  if (TUK == Action::TUK_Definition) {
904    assert(Tok.is(tok::l_brace) ||
905           (getLang().CPlusPlus && Tok.is(tok::colon)));
906    if (getLang().CPlusPlus)
907      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
908    else
909      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
910  }
911
912  void *Result;
913  if (!TypeResult.isInvalid()) {
914    TagType = DeclSpec::TST_typename;
915    Result = TypeResult.get();
916    Owned = false;
917  } else if (!TagOrTempResult.isInvalid()) {
918    Result = TagOrTempResult.get().getAs<void>();
919  } else {
920    DS.SetTypeSpecError();
921    return;
922  }
923
924  const char *PrevSpec = 0;
925  unsigned DiagID;
926
927  // FIXME: The DeclSpec should keep the locations of both the keyword and the
928  // name (if there is one).
929  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
930
931  if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
932                         Result, Owned))
933    Diag(StartLoc, DiagID) << PrevSpec;
934
935  // At this point, we've successfully parsed a class-specifier in 'definition'
936  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
937  // going to look at what comes after it to improve error recovery.  If an
938  // impossible token occurs next, we assume that the programmer forgot a ; at
939  // the end of the declaration and recover that way.
940  //
941  // This switch enumerates the valid "follow" set for definition.
942  if (TUK == Action::TUK_Definition) {
943    bool ExpectedSemi = true;
944    switch (Tok.getKind()) {
945    default: break;
946    case tok::semi:               // struct foo {...} ;
947    case tok::star:               // struct foo {...} *         P;
948    case tok::amp:                // struct foo {...} &         R = ...
949    case tok::identifier:         // struct foo {...} V         ;
950    case tok::r_paren:            //(struct foo {...} )         {4}
951    case tok::annot_cxxscope:     // struct foo {...} a::       b;
952    case tok::annot_typename:     // struct foo {...} a         ::b;
953    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
954    case tok::l_paren:            // struct foo {...} (         x);
955    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
956      ExpectedSemi = false;
957      break;
958    // Type qualifiers
959    case tok::kw_const:           // struct foo {...} const     x;
960    case tok::kw_volatile:        // struct foo {...} volatile  x;
961    case tok::kw_restrict:        // struct foo {...} restrict  x;
962    case tok::kw_inline:          // struct foo {...} inline    foo() {};
963    // Storage-class specifiers
964    case tok::kw_static:          // struct foo {...} static    x;
965    case tok::kw_extern:          // struct foo {...} extern    x;
966    case tok::kw_typedef:         // struct foo {...} typedef   x;
967    case tok::kw_register:        // struct foo {...} register  x;
968    case tok::kw_auto:            // struct foo {...} auto      x;
969      // As shown above, type qualifiers and storage class specifiers absolutely
970      // can occur after class specifiers according to the grammar.  However,
971      // almost noone actually writes code like this.  If we see one of these,
972      // it is much more likely that someone missed a semi colon and the
973      // type/storage class specifier we're seeing is part of the *next*
974      // intended declaration, as in:
975      //
976      //   struct foo { ... }
977      //   typedef int X;
978      //
979      // We'd really like to emit a missing semicolon error instead of emitting
980      // an error on the 'int' saying that you can't have two type specifiers in
981      // the same declaration of X.  Because of this, we look ahead past this
982      // token to see if it's a type specifier.  If so, we know the code is
983      // otherwise invalid, so we can produce the expected semi error.
984      if (!isKnownToBeTypeSpecifier(NextToken()))
985        ExpectedSemi = false;
986      break;
987
988    case tok::r_brace:  // struct bar { struct foo {...} }
989      // Missing ';' at end of struct is accepted as an extension in C mode.
990      if (!getLang().CPlusPlus)
991        ExpectedSemi = false;
992      break;
993    }
994
995    if (ExpectedSemi) {
996      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
997                       TagType == DeclSpec::TST_class ? "class"
998                       : TagType == DeclSpec::TST_struct? "struct" : "union");
999      // Push this token back into the preprocessor and change our current token
1000      // to ';' so that the rest of the code recovers as though there were an
1001      // ';' after the definition.
1002      PP.EnterToken(Tok);
1003      Tok.setKind(tok::semi);
1004    }
1005  }
1006}
1007
1008/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1009///
1010///       base-clause : [C++ class.derived]
1011///         ':' base-specifier-list
1012///       base-specifier-list:
1013///         base-specifier '...'[opt]
1014///         base-specifier-list ',' base-specifier '...'[opt]
1015void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
1016  assert(Tok.is(tok::colon) && "Not a base clause");
1017  ConsumeToken();
1018
1019  // Build up an array of parsed base specifiers.
1020  llvm::SmallVector<BaseTy *, 8> BaseInfo;
1021
1022  while (true) {
1023    // Parse a base-specifier.
1024    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1025    if (Result.isInvalid()) {
1026      // Skip the rest of this base specifier, up until the comma or
1027      // opening brace.
1028      SkipUntil(tok::comma, tok::l_brace, true, true);
1029    } else {
1030      // Add this to our array of base specifiers.
1031      BaseInfo.push_back(Result.get());
1032    }
1033
1034    // If the next token is a comma, consume it and keep reading
1035    // base-specifiers.
1036    if (Tok.isNot(tok::comma)) break;
1037
1038    // Consume the comma.
1039    ConsumeToken();
1040  }
1041
1042  // Attach the base specifiers
1043  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1044}
1045
1046/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1047/// one entry in the base class list of a class specifier, for example:
1048///    class foo : public bar, virtual private baz {
1049/// 'public bar' and 'virtual private baz' are each base-specifiers.
1050///
1051///       base-specifier: [C++ class.derived]
1052///         ::[opt] nested-name-specifier[opt] class-name
1053///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1054///                        class-name
1055///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1056///                        class-name
1057Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
1058  bool IsVirtual = false;
1059  SourceLocation StartLoc = Tok.getLocation();
1060
1061  // Parse the 'virtual' keyword.
1062  if (Tok.is(tok::kw_virtual))  {
1063    ConsumeToken();
1064    IsVirtual = true;
1065  }
1066
1067  // Parse an (optional) access specifier.
1068  AccessSpecifier Access = getAccessSpecifierIfPresent();
1069  if (Access != AS_none)
1070    ConsumeToken();
1071
1072  // Parse the 'virtual' keyword (again!), in case it came after the
1073  // access specifier.
1074  if (Tok.is(tok::kw_virtual))  {
1075    SourceLocation VirtualLoc = ConsumeToken();
1076    if (IsVirtual) {
1077      // Complain about duplicate 'virtual'
1078      Diag(VirtualLoc, diag::err_dup_virtual)
1079        << CodeModificationHint::CreateRemoval(VirtualLoc);
1080    }
1081
1082    IsVirtual = true;
1083  }
1084
1085  // Parse optional '::' and optional nested-name-specifier.
1086  CXXScopeSpec SS;
1087  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1088
1089  // The location of the base class itself.
1090  SourceLocation BaseLoc = Tok.getLocation();
1091
1092  // Parse the class-name.
1093  SourceLocation EndLocation;
1094  TypeResult BaseType = ParseClassName(EndLocation, &SS);
1095  if (BaseType.isInvalid())
1096    return true;
1097
1098  // Find the complete source range for the base-specifier.
1099  SourceRange Range(StartLoc, EndLocation);
1100
1101  // Notify semantic analysis that we have parsed a complete
1102  // base-specifier.
1103  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1104                                    BaseType.get(), BaseLoc);
1105}
1106
1107/// getAccessSpecifierIfPresent - Determine whether the next token is
1108/// a C++ access-specifier.
1109///
1110///       access-specifier: [C++ class.derived]
1111///         'private'
1112///         'protected'
1113///         'public'
1114AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1115  switch (Tok.getKind()) {
1116  default: return AS_none;
1117  case tok::kw_private: return AS_private;
1118  case tok::kw_protected: return AS_protected;
1119  case tok::kw_public: return AS_public;
1120  }
1121}
1122
1123void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1124                                             DeclPtrTy ThisDecl) {
1125  // We just declared a member function. If this member function
1126  // has any default arguments, we'll need to parse them later.
1127  LateParsedMethodDeclaration *LateMethod = 0;
1128  DeclaratorChunk::FunctionTypeInfo &FTI
1129    = DeclaratorInfo.getTypeObject(0).Fun;
1130  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1131    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1132      if (!LateMethod) {
1133        // Push this method onto the stack of late-parsed method
1134        // declarations.
1135        getCurrentClass().MethodDecls.push_back(
1136                                LateParsedMethodDeclaration(ThisDecl));
1137        LateMethod = &getCurrentClass().MethodDecls.back();
1138        LateMethod->TemplateScope = CurScope->isTemplateParamScope();
1139
1140        // Add all of the parameters prior to this one (they don't
1141        // have default arguments).
1142        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1143        for (unsigned I = 0; I < ParamIdx; ++I)
1144          LateMethod->DefaultArgs.push_back(
1145                    LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
1146      }
1147
1148      // Add this parameter to the list of parameters (it or may
1149      // not have a default argument).
1150      LateMethod->DefaultArgs.push_back(
1151        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1152                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1153    }
1154  }
1155}
1156
1157/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1158///
1159///       member-declaration:
1160///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1161///         function-definition ';'[opt]
1162///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1163///         using-declaration                                            [TODO]
1164/// [C++0x] static_assert-declaration
1165///         template-declaration
1166/// [GNU]   '__extension__' member-declaration
1167///
1168///       member-declarator-list:
1169///         member-declarator
1170///         member-declarator-list ',' member-declarator
1171///
1172///       member-declarator:
1173///         declarator pure-specifier[opt]
1174///         declarator constant-initializer[opt]
1175///         identifier[opt] ':' constant-expression
1176///
1177///       pure-specifier:
1178///         '= 0'
1179///
1180///       constant-initializer:
1181///         '=' constant-expression
1182///
1183void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1184                                       const ParsedTemplateInfo &TemplateInfo) {
1185  // Access declarations.
1186  if (!TemplateInfo.Kind &&
1187      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1188      !TryAnnotateCXXScopeToken() &&
1189      Tok.is(tok::annot_cxxscope)) {
1190    bool isAccessDecl = false;
1191    if (NextToken().is(tok::identifier))
1192      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1193    else
1194      isAccessDecl = NextToken().is(tok::kw_operator);
1195
1196    if (isAccessDecl) {
1197      // Collect the scope specifier token we annotated earlier.
1198      CXXScopeSpec SS;
1199      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
1200
1201      // Try to parse an unqualified-id.
1202      UnqualifiedId Name;
1203      if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
1204        SkipUntil(tok::semi);
1205        return;
1206      }
1207
1208      // TODO: recover from mistakenly-qualified operator declarations.
1209      if (ExpectAndConsume(tok::semi,
1210                           diag::err_expected_semi_after,
1211                           "access declaration",
1212                           tok::semi))
1213        return;
1214
1215      Actions.ActOnUsingDeclaration(CurScope, AS,
1216                                    false, SourceLocation(),
1217                                    SS, Name,
1218                                    /* AttrList */ 0,
1219                                    /* IsTypeName */ false,
1220                                    SourceLocation());
1221      return;
1222    }
1223  }
1224
1225  // static_assert-declaration
1226  if (Tok.is(tok::kw_static_assert)) {
1227    // FIXME: Check for templates
1228    SourceLocation DeclEnd;
1229    ParseStaticAssertDeclaration(DeclEnd);
1230    return;
1231  }
1232
1233  if (Tok.is(tok::kw_template)) {
1234    assert(!TemplateInfo.TemplateParams &&
1235           "Nested template improperly parsed?");
1236    SourceLocation DeclEnd;
1237    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1238                                         AS);
1239    return;
1240  }
1241
1242  // Handle:  member-declaration ::= '__extension__' member-declaration
1243  if (Tok.is(tok::kw___extension__)) {
1244    // __extension__ silences extension warnings in the subexpression.
1245    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1246    ConsumeToken();
1247    return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
1248  }
1249
1250  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1251  // is a bitfield.
1252  ColonProtectionRAIIObject X(*this);
1253
1254  CXX0XAttributeList AttrList;
1255  // Optional C++0x attribute-specifier
1256  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1257    AttrList = ParseCXX0XAttributes();
1258
1259  if (Tok.is(tok::kw_using)) {
1260    // FIXME: Check for template aliases
1261
1262    if (AttrList.HasAttr)
1263      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1264        << AttrList.Range;
1265
1266    // Eat 'using'.
1267    SourceLocation UsingLoc = ConsumeToken();
1268
1269    if (Tok.is(tok::kw_namespace)) {
1270      Diag(UsingLoc, diag::err_using_namespace_in_class);
1271      SkipUntil(tok::semi, true, true);
1272    } else {
1273      SourceLocation DeclEnd;
1274      // Otherwise, it must be using-declaration.
1275      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1276    }
1277    return;
1278  }
1279
1280  SourceLocation DSStart = Tok.getLocation();
1281  // decl-specifier-seq:
1282  // Parse the common declaration-specifiers piece.
1283  ParsingDeclSpec DS(*this);
1284  DS.AddAttributes(AttrList.AttrList);
1285  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1286
1287  Action::MultiTemplateParamsArg TemplateParams(Actions,
1288      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1289      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1290
1291  if (Tok.is(tok::semi)) {
1292    ConsumeToken();
1293    Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1294    return;
1295  }
1296
1297  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1298
1299  if (Tok.isNot(tok::colon)) {
1300    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1301    ColonProtectionRAIIObject X(*this);
1302
1303    // Parse the first declarator.
1304    ParseDeclarator(DeclaratorInfo);
1305    // Error parsing the declarator?
1306    if (!DeclaratorInfo.hasName()) {
1307      // If so, skip until the semi-colon or a }.
1308      SkipUntil(tok::r_brace, true);
1309      if (Tok.is(tok::semi))
1310        ConsumeToken();
1311      return;
1312    }
1313
1314    // If attributes exist after the declarator, but before an '{', parse them.
1315    if (Tok.is(tok::kw___attribute)) {
1316      SourceLocation Loc;
1317      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1318      DeclaratorInfo.AddAttributes(AttrList, Loc);
1319    }
1320
1321    // function-definition:
1322    if (Tok.is(tok::l_brace)
1323        || (DeclaratorInfo.isFunctionDeclarator() &&
1324            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1325      if (!DeclaratorInfo.isFunctionDeclarator()) {
1326        Diag(Tok, diag::err_func_def_no_params);
1327        ConsumeBrace();
1328        SkipUntil(tok::r_brace, true);
1329        return;
1330      }
1331
1332      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1333        Diag(Tok, diag::err_function_declared_typedef);
1334        // This recovery skips the entire function body. It would be nice
1335        // to simply call ParseCXXInlineMethodDef() below, however Sema
1336        // assumes the declarator represents a function, not a typedef.
1337        ConsumeBrace();
1338        SkipUntil(tok::r_brace, true);
1339        return;
1340      }
1341
1342      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1343      return;
1344    }
1345  }
1346
1347  // member-declarator-list:
1348  //   member-declarator
1349  //   member-declarator-list ',' member-declarator
1350
1351  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1352  OwningExprResult BitfieldSize(Actions);
1353  OwningExprResult Init(Actions);
1354  bool Deleted = false;
1355
1356  while (1) {
1357    // member-declarator:
1358    //   declarator pure-specifier[opt]
1359    //   declarator constant-initializer[opt]
1360    //   identifier[opt] ':' constant-expression
1361
1362    if (Tok.is(tok::colon)) {
1363      ConsumeToken();
1364      BitfieldSize = ParseConstantExpression();
1365      if (BitfieldSize.isInvalid())
1366        SkipUntil(tok::comma, true, true);
1367    }
1368
1369    // pure-specifier:
1370    //   '= 0'
1371    //
1372    // constant-initializer:
1373    //   '=' constant-expression
1374    //
1375    // defaulted/deleted function-definition:
1376    //   '=' 'default'                          [TODO]
1377    //   '=' 'delete'
1378
1379    if (Tok.is(tok::equal)) {
1380      ConsumeToken();
1381      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1382        ConsumeToken();
1383        Deleted = true;
1384      } else {
1385        Init = ParseInitializer();
1386        if (Init.isInvalid())
1387          SkipUntil(tok::comma, true, true);
1388      }
1389    }
1390
1391    // If attributes exist after the declarator, parse them.
1392    if (Tok.is(tok::kw___attribute)) {
1393      SourceLocation Loc;
1394      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1395      DeclaratorInfo.AddAttributes(AttrList, Loc);
1396    }
1397
1398    // NOTE: If Sema is the Action module and declarator is an instance field,
1399    // this call will *not* return the created decl; It will return null.
1400    // See Sema::ActOnCXXMemberDeclarator for details.
1401
1402    DeclPtrTy ThisDecl;
1403    if (DS.isFriendSpecified()) {
1404      // TODO: handle initializers, bitfields, 'delete'
1405      ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
1406                                                 /*IsDefinition*/ false,
1407                                                 move(TemplateParams));
1408    } else {
1409      ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1410                                                  DeclaratorInfo,
1411                                                  move(TemplateParams),
1412                                                  BitfieldSize.release(),
1413                                                  Init.release(),
1414                                                  /*IsDefinition*/Deleted,
1415                                                  Deleted);
1416    }
1417    if (ThisDecl)
1418      DeclsInGroup.push_back(ThisDecl);
1419
1420    if (DeclaratorInfo.isFunctionDeclarator() &&
1421        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1422          != DeclSpec::SCS_typedef) {
1423      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1424    }
1425
1426    DeclaratorInfo.complete(ThisDecl);
1427
1428    // If we don't have a comma, it is either the end of the list (a ';')
1429    // or an error, bail out.
1430    if (Tok.isNot(tok::comma))
1431      break;
1432
1433    // Consume the comma.
1434    ConsumeToken();
1435
1436    // Parse the next declarator.
1437    DeclaratorInfo.clear();
1438    BitfieldSize = 0;
1439    Init = 0;
1440    Deleted = false;
1441
1442    // Attributes are only allowed on the second declarator.
1443    if (Tok.is(tok::kw___attribute)) {
1444      SourceLocation Loc;
1445      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1446      DeclaratorInfo.AddAttributes(AttrList, Loc);
1447    }
1448
1449    if (Tok.isNot(tok::colon))
1450      ParseDeclarator(DeclaratorInfo);
1451  }
1452
1453  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1454    // Skip to end of block or statement.
1455    SkipUntil(tok::r_brace, true, true);
1456    // If we stopped at a ';', eat it.
1457    if (Tok.is(tok::semi)) ConsumeToken();
1458    return;
1459  }
1460
1461  Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1462                                  DeclsInGroup.size());
1463}
1464
1465/// ParseCXXMemberSpecification - Parse the class definition.
1466///
1467///       member-specification:
1468///         member-declaration member-specification[opt]
1469///         access-specifier ':' member-specification[opt]
1470///
1471void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1472                                         unsigned TagType, DeclPtrTy TagDecl) {
1473  assert((TagType == DeclSpec::TST_struct ||
1474         TagType == DeclSpec::TST_union  ||
1475         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1476
1477  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1478                                        PP.getSourceManager(),
1479                                        "parsing struct/union/class body");
1480
1481  // Determine whether this is a non-nested class. Note that local
1482  // classes are *not* considered to be nested classes.
1483  bool NonNestedClass = true;
1484  if (!ClassStack.empty()) {
1485    for (const Scope *S = CurScope; S; S = S->getParent()) {
1486      if (S->isClassScope()) {
1487        // We're inside a class scope, so this is a nested class.
1488        NonNestedClass = false;
1489        break;
1490      }
1491
1492      if ((S->getFlags() & Scope::FnScope)) {
1493        // If we're in a function or function template declared in the
1494        // body of a class, then this is a local class rather than a
1495        // nested class.
1496        const Scope *Parent = S->getParent();
1497        if (Parent->isTemplateParamScope())
1498          Parent = Parent->getParent();
1499        if (Parent->isClassScope())
1500          break;
1501      }
1502    }
1503  }
1504
1505  // Enter a scope for the class.
1506  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1507
1508  // Note that we are parsing a new (potentially-nested) class definition.
1509  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1510
1511  if (TagDecl)
1512    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1513
1514  if (Tok.is(tok::colon)) {
1515    ParseBaseClause(TagDecl);
1516
1517    if (!Tok.is(tok::l_brace)) {
1518      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1519      return;
1520    }
1521  }
1522
1523  assert(Tok.is(tok::l_brace));
1524
1525  SourceLocation LBraceLoc = ConsumeBrace();
1526
1527  if (!TagDecl) {
1528    SkipUntil(tok::r_brace, false, false);
1529    return;
1530  }
1531
1532  Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc);
1533
1534  // C++ 11p3: Members of a class defined with the keyword class are private
1535  // by default. Members of a class defined with the keywords struct or union
1536  // are public by default.
1537  AccessSpecifier CurAS;
1538  if (TagType == DeclSpec::TST_class)
1539    CurAS = AS_private;
1540  else
1541    CurAS = AS_public;
1542
1543  // While we still have something to read, read the member-declarations.
1544  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1545    // Each iteration of this loop reads one member-declaration.
1546
1547    // Check for extraneous top-level semicolon.
1548    if (Tok.is(tok::semi)) {
1549      Diag(Tok, diag::ext_extra_struct_semi)
1550        << CodeModificationHint::CreateRemoval(Tok.getLocation());
1551      ConsumeToken();
1552      continue;
1553    }
1554
1555    AccessSpecifier AS = getAccessSpecifierIfPresent();
1556    if (AS != AS_none) {
1557      // Current token is a C++ access specifier.
1558      CurAS = AS;
1559      ConsumeToken();
1560      ExpectAndConsume(tok::colon, diag::err_expected_colon);
1561      continue;
1562    }
1563
1564    // FIXME: Make sure we don't have a template here.
1565
1566    // Parse all the comma separated declarators.
1567    ParseCXXClassMemberDeclaration(CurAS);
1568  }
1569
1570  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1571
1572  // If attributes exist after class contents, parse them.
1573  llvm::OwningPtr<AttributeList> AttrList;
1574  if (Tok.is(tok::kw___attribute))
1575    AttrList.reset(ParseGNUAttributes()); // FIXME: where should I put them?
1576
1577  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1578                                            LBraceLoc, RBraceLoc);
1579
1580  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1581  // complete within function bodies, default arguments,
1582  // exception-specifications, and constructor ctor-initializers (including
1583  // such things in nested classes).
1584  //
1585  // FIXME: Only function bodies and constructor ctor-initializers are
1586  // parsed correctly, fix the rest.
1587  if (NonNestedClass) {
1588    // We are not inside a nested class. This class and its nested classes
1589    // are complete and we can parse the delayed portions of method
1590    // declarations and the lexed inline method definitions.
1591    ParseLexedMethodDeclarations(getCurrentClass());
1592    ParseLexedMethodDefs(getCurrentClass());
1593  }
1594
1595  // Leave the class scope.
1596  ParsingDef.Pop();
1597  ClassScope.Exit();
1598
1599  Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1600}
1601
1602/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1603/// which explicitly initializes the members or base classes of a
1604/// class (C++ [class.base.init]). For example, the three initializers
1605/// after the ':' in the Derived constructor below:
1606///
1607/// @code
1608/// class Base { };
1609/// class Derived : Base {
1610///   int x;
1611///   float f;
1612/// public:
1613///   Derived(float f) : Base(), x(17), f(f) { }
1614/// };
1615/// @endcode
1616///
1617/// [C++]  ctor-initializer:
1618///          ':' mem-initializer-list
1619///
1620/// [C++]  mem-initializer-list:
1621///          mem-initializer
1622///          mem-initializer , mem-initializer-list
1623void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1624  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1625
1626  SourceLocation ColonLoc = ConsumeToken();
1627
1628  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1629  bool AnyErrors = false;
1630
1631  do {
1632    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1633    if (!MemInit.isInvalid())
1634      MemInitializers.push_back(MemInit.get());
1635    else
1636      AnyErrors = true;
1637
1638    if (Tok.is(tok::comma))
1639      ConsumeToken();
1640    else if (Tok.is(tok::l_brace))
1641      break;
1642    else {
1643      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1644      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1645      SkipUntil(tok::l_brace, true, true);
1646      break;
1647    }
1648  } while (true);
1649
1650  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1651                               MemInitializers.data(), MemInitializers.size(),
1652                               AnyErrors);
1653}
1654
1655/// ParseMemInitializer - Parse a C++ member initializer, which is
1656/// part of a constructor initializer that explicitly initializes one
1657/// member or base class (C++ [class.base.init]). See
1658/// ParseConstructorInitializer for an example.
1659///
1660/// [C++] mem-initializer:
1661///         mem-initializer-id '(' expression-list[opt] ')'
1662///
1663/// [C++] mem-initializer-id:
1664///         '::'[opt] nested-name-specifier[opt] class-name
1665///         identifier
1666Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1667  // parse '::'[opt] nested-name-specifier[opt]
1668  CXXScopeSpec SS;
1669  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1670  TypeTy *TemplateTypeTy = 0;
1671  if (Tok.is(tok::annot_template_id)) {
1672    TemplateIdAnnotation *TemplateId
1673      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1674    if (TemplateId->Kind == TNK_Type_template ||
1675        TemplateId->Kind == TNK_Dependent_template_name) {
1676      AnnotateTemplateIdTokenAsType(&SS);
1677      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1678      TemplateTypeTy = Tok.getAnnotationValue();
1679    }
1680  }
1681  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1682    Diag(Tok, diag::err_expected_member_or_base_name);
1683    return true;
1684  }
1685
1686  // Get the identifier. This may be a member name or a class name,
1687  // but we'll let the semantic analysis determine which it is.
1688  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1689  SourceLocation IdLoc = ConsumeToken();
1690
1691  // Parse the '('.
1692  if (Tok.isNot(tok::l_paren)) {
1693    Diag(Tok, diag::err_expected_lparen);
1694    return true;
1695  }
1696  SourceLocation LParenLoc = ConsumeParen();
1697
1698  // Parse the optional expression-list.
1699  ExprVector ArgExprs(Actions);
1700  CommaLocsTy CommaLocs;
1701  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1702    SkipUntil(tok::r_paren);
1703    return true;
1704  }
1705
1706  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1707
1708  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1709                                     TemplateTypeTy, IdLoc,
1710                                     LParenLoc, ArgExprs.take(),
1711                                     ArgExprs.size(), CommaLocs.data(),
1712                                     RParenLoc);
1713}
1714
1715/// ParseExceptionSpecification - Parse a C++ exception-specification
1716/// (C++ [except.spec]).
1717///
1718///       exception-specification:
1719///         'throw' '(' type-id-list [opt] ')'
1720/// [MS]    'throw' '(' '...' ')'
1721///
1722///       type-id-list:
1723///         type-id
1724///         type-id-list ',' type-id
1725///
1726bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1727                                         llvm::SmallVector<TypeTy*, 2>
1728                                             &Exceptions,
1729                                         llvm::SmallVector<SourceRange, 2>
1730                                             &Ranges,
1731                                         bool &hasAnyExceptionSpec) {
1732  assert(Tok.is(tok::kw_throw) && "expected throw");
1733
1734  SourceLocation ThrowLoc = ConsumeToken();
1735
1736  if (!Tok.is(tok::l_paren)) {
1737    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1738  }
1739  SourceLocation LParenLoc = ConsumeParen();
1740
1741  // Parse throw(...), a Microsoft extension that means "this function
1742  // can throw anything".
1743  if (Tok.is(tok::ellipsis)) {
1744    hasAnyExceptionSpec = true;
1745    SourceLocation EllipsisLoc = ConsumeToken();
1746    if (!getLang().Microsoft)
1747      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1748    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1749    return false;
1750  }
1751
1752  // Parse the sequence of type-ids.
1753  SourceRange Range;
1754  while (Tok.isNot(tok::r_paren)) {
1755    TypeResult Res(ParseTypeName(&Range));
1756    if (!Res.isInvalid()) {
1757      Exceptions.push_back(Res.get());
1758      Ranges.push_back(Range);
1759    }
1760    if (Tok.is(tok::comma))
1761      ConsumeToken();
1762    else
1763      break;
1764  }
1765
1766  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1767  return false;
1768}
1769
1770/// \brief We have just started parsing the definition of a new class,
1771/// so push that class onto our stack of classes that is currently
1772/// being parsed.
1773void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) {
1774  assert((NonNestedClass || !ClassStack.empty()) &&
1775         "Nested class without outer class");
1776  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
1777}
1778
1779/// \brief Deallocate the given parsed class and all of its nested
1780/// classes.
1781void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1782  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1783    DeallocateParsedClasses(Class->NestedClasses[I]);
1784  delete Class;
1785}
1786
1787/// \brief Pop the top class of the stack of classes that are
1788/// currently being parsed.
1789///
1790/// This routine should be called when we have finished parsing the
1791/// definition of a class, but have not yet popped the Scope
1792/// associated with the class's definition.
1793///
1794/// \returns true if the class we've popped is a top-level class,
1795/// false otherwise.
1796void Parser::PopParsingClass() {
1797  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1798
1799  ParsingClass *Victim = ClassStack.top();
1800  ClassStack.pop();
1801  if (Victim->TopLevelClass) {
1802    // Deallocate all of the nested classes of this class,
1803    // recursively: we don't need to keep any of this information.
1804    DeallocateParsedClasses(Victim);
1805    return;
1806  }
1807  assert(!ClassStack.empty() && "Missing top-level class?");
1808
1809  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1810      Victim->NestedClasses.empty()) {
1811    // The victim is a nested class, but we will not need to perform
1812    // any processing after the definition of this class since it has
1813    // no members whose handling was delayed. Therefore, we can just
1814    // remove this nested class.
1815    delete Victim;
1816    return;
1817  }
1818
1819  // This nested class has some members that will need to be processed
1820  // after the top-level class is completely defined. Therefore, add
1821  // it to the list of nested classes within its parent.
1822  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1823  ClassStack.top()->NestedClasses.push_back(Victim);
1824  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1825}
1826
1827/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1828/// parses standard attributes.
1829///
1830/// [C++0x] attribute-specifier:
1831///         '[' '[' attribute-list ']' ']'
1832///
1833/// [C++0x] attribute-list:
1834///         attribute[opt]
1835///         attribute-list ',' attribute[opt]
1836///
1837/// [C++0x] attribute:
1838///         attribute-token attribute-argument-clause[opt]
1839///
1840/// [C++0x] attribute-token:
1841///         identifier
1842///         attribute-scoped-token
1843///
1844/// [C++0x] attribute-scoped-token:
1845///         attribute-namespace '::' identifier
1846///
1847/// [C++0x] attribute-namespace:
1848///         identifier
1849///
1850/// [C++0x] attribute-argument-clause:
1851///         '(' balanced-token-seq ')'
1852///
1853/// [C++0x] balanced-token-seq:
1854///         balanced-token
1855///         balanced-token-seq balanced-token
1856///
1857/// [C++0x] balanced-token:
1858///         '(' balanced-token-seq ')'
1859///         '[' balanced-token-seq ']'
1860///         '{' balanced-token-seq '}'
1861///         any token but '(', ')', '[', ']', '{', or '}'
1862CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1863  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1864      && "Not a C++0x attribute list");
1865
1866  SourceLocation StartLoc = Tok.getLocation(), Loc;
1867  AttributeList *CurrAttr = 0;
1868
1869  ConsumeBracket();
1870  ConsumeBracket();
1871
1872  if (Tok.is(tok::comma)) {
1873    Diag(Tok.getLocation(), diag::err_expected_ident);
1874    ConsumeToken();
1875  }
1876
1877  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1878    // attribute not present
1879    if (Tok.is(tok::comma)) {
1880      ConsumeToken();
1881      continue;
1882    }
1883
1884    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1885    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1886
1887    // scoped attribute
1888    if (Tok.is(tok::coloncolon)) {
1889      ConsumeToken();
1890
1891      if (!Tok.is(tok::identifier)) {
1892        Diag(Tok.getLocation(), diag::err_expected_ident);
1893        SkipUntil(tok::r_square, tok::comma, true, true);
1894        continue;
1895      }
1896
1897      ScopeName = AttrName;
1898      ScopeLoc = AttrLoc;
1899
1900      AttrName = Tok.getIdentifierInfo();
1901      AttrLoc = ConsumeToken();
1902    }
1903
1904    bool AttrParsed = false;
1905    // No scoped names are supported; ideally we could put all non-standard
1906    // attributes into namespaces.
1907    if (!ScopeName) {
1908      switch(AttributeList::getKind(AttrName))
1909      {
1910      // No arguments
1911      case AttributeList::AT_base_check:
1912      case AttributeList::AT_carries_dependency:
1913      case AttributeList::AT_final:
1914      case AttributeList::AT_hiding:
1915      case AttributeList::AT_noreturn:
1916      case AttributeList::AT_override: {
1917        if (Tok.is(tok::l_paren)) {
1918          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
1919            << AttrName->getName();
1920          break;
1921        }
1922
1923        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
1924                                     SourceLocation(), 0, 0, CurrAttr, false,
1925                                     true);
1926        AttrParsed = true;
1927        break;
1928      }
1929
1930      // One argument; must be a type-id or assignment-expression
1931      case AttributeList::AT_aligned: {
1932        if (Tok.isNot(tok::l_paren)) {
1933          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
1934            << AttrName->getName();
1935          break;
1936        }
1937        SourceLocation ParamLoc = ConsumeParen();
1938
1939        OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
1940
1941        MatchRHSPunctuation(tok::r_paren, ParamLoc);
1942
1943        ExprVector ArgExprs(Actions);
1944        ArgExprs.push_back(ArgExpr.release());
1945        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
1946                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
1947                                     false, true);
1948
1949        AttrParsed = true;
1950        break;
1951      }
1952
1953      // Silence warnings
1954      default: break;
1955      }
1956    }
1957
1958    // Skip the entire parameter clause, if any
1959    if (!AttrParsed && Tok.is(tok::l_paren)) {
1960      ConsumeParen();
1961      // SkipUntil maintains the balancedness of tokens.
1962      SkipUntil(tok::r_paren, false);
1963    }
1964  }
1965
1966  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1967    SkipUntil(tok::r_square, false);
1968  Loc = Tok.getLocation();
1969  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1970    SkipUntil(tok::r_square, false);
1971
1972  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
1973  return Attr;
1974}
1975
1976/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
1977/// attribute.
1978///
1979/// FIXME: Simply returns an alignof() expression if the argument is a
1980/// type. Ideally, the type should be propagated directly into Sema.
1981///
1982/// [C++0x] 'align' '(' type-id ')'
1983/// [C++0x] 'align' '(' assignment-expression ')'
1984Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
1985  if (isTypeIdInParens()) {
1986    EnterExpressionEvaluationContext Unevaluated(Actions,
1987                                                  Action::Unevaluated);
1988    SourceLocation TypeLoc = Tok.getLocation();
1989    TypeTy *Ty = ParseTypeName().get();
1990    SourceRange TypeRange(Start, Tok.getLocation());
1991    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty,
1992                                              TypeRange);
1993  } else
1994    return ParseConstantExpression();
1995}
1996