ParseDeclCXX.cpp revision 35f9a196ef897b9559de25aaecd957208f0b4f59 
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(getCurScope());
53    ConsumeCodeCompletionToken();
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  if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
91      getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
92      getCurScope()->getFnParent()) {
93    Diag(LBrace, diag::err_namespace_nonnamespace_scope);
94    SkipUntil(tok::r_brace, false);
95    return DeclPtrTy();
96  }
97
98  // Enter a scope for the namespace.
99  ParseScope NamespaceScope(this, Scope::DeclScope);
100
101  DeclPtrTy NamespcDecl =
102    Actions.ActOnStartNamespaceDef(getCurScope(), IdentLoc, Ident, LBrace,
103                                   AttrList.get());
104
105  PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
106                                        PP.getSourceManager(),
107                                        "parsing namespace");
108
109  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
110    CXX0XAttributeList Attr;
111    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
112      Attr = ParseCXX0XAttributes();
113    ParseExternalDeclaration(Attr);
114  }
115
116  // Leave the namespace scope.
117  NamespaceScope.Exit();
118
119  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
120  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
121
122  DeclEnd = RBraceLoc;
123  return NamespcDecl;
124}
125
126/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
127/// alias definition.
128///
129Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
130                                              SourceLocation AliasLoc,
131                                              IdentifierInfo *Alias,
132                                              SourceLocation &DeclEnd) {
133  assert(Tok.is(tok::equal) && "Not equal token");
134
135  ConsumeToken(); // eat the '='.
136
137  if (Tok.is(tok::code_completion)) {
138    Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
139    ConsumeCodeCompletionToken();
140  }
141
142  CXXScopeSpec SS;
143  // Parse (optional) nested-name-specifier.
144  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
145
146  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
147    Diag(Tok, diag::err_expected_namespace_name);
148    // Skip to end of the definition and eat the ';'.
149    SkipUntil(tok::semi);
150    return DeclPtrTy();
151  }
152
153  // Parse identifier.
154  IdentifierInfo *Ident = Tok.getIdentifierInfo();
155  SourceLocation IdentLoc = ConsumeToken();
156
157  // Eat the ';'.
158  DeclEnd = Tok.getLocation();
159  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
160                   "", tok::semi);
161
162  return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
163                                        SS, IdentLoc, Ident);
164}
165
166/// ParseLinkage - We know that the current token is a string_literal
167/// and just before that, that extern was seen.
168///
169///       linkage-specification: [C++ 7.5p2: dcl.link]
170///         'extern' string-literal '{' declaration-seq[opt] '}'
171///         'extern' string-literal declaration
172///
173Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS,
174                                       unsigned Context) {
175  assert(Tok.is(tok::string_literal) && "Not a string literal!");
176  llvm::SmallString<8> LangBuffer;
177  // LangBuffer is guaranteed to be big enough.
178  bool Invalid = false;
179  llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
180  if (Invalid)
181    return DeclPtrTy();
182
183  SourceLocation Loc = ConsumeStringToken();
184
185  ParseScope LinkageScope(this, Scope::DeclScope);
186  DeclPtrTy LinkageSpec
187    = Actions.ActOnStartLinkageSpecification(getCurScope(),
188                                             /*FIXME: */SourceLocation(),
189                                             Loc, Lang,
190                                       Tok.is(tok::l_brace)? Tok.getLocation()
191                                                           : SourceLocation());
192
193  CXX0XAttributeList Attr;
194  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
195    Attr = ParseCXX0XAttributes();
196  }
197
198  if (Tok.isNot(tok::l_brace)) {
199    DS.setExternInLinkageSpec(true);
200    ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList);
201    return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
202                                                   SourceLocation());
203  }
204
205  DS.abort();
206
207  if (Attr.HasAttr)
208    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
209      << Attr.Range;
210
211  SourceLocation LBrace = ConsumeBrace();
212  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
213    CXX0XAttributeList Attr;
214    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
215      Attr = ParseCXX0XAttributes();
216    ParseExternalDeclaration(Attr);
217  }
218
219  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
220  return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, RBrace);
221}
222
223/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
224/// using-directive. Assumes that current token is 'using'.
225Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
226                                                     SourceLocation &DeclEnd,
227                                                     CXX0XAttributeList Attr) {
228  assert(Tok.is(tok::kw_using) && "Not using token");
229
230  // Eat 'using'.
231  SourceLocation UsingLoc = ConsumeToken();
232
233  if (Tok.is(tok::code_completion)) {
234    Actions.CodeCompleteUsing(getCurScope());
235    ConsumeCodeCompletionToken();
236  }
237
238  if (Tok.is(tok::kw_namespace))
239    // Next token after 'using' is 'namespace' so it must be using-directive
240    return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
241
242  if (Attr.HasAttr)
243    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
244      << Attr.Range;
245
246  // Otherwise, it must be using-declaration.
247  // Ignore illegal attributes (the caller should already have issued an error.
248  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
249}
250
251/// ParseUsingDirective - Parse C++ using-directive, assumes
252/// that current token is 'namespace' and 'using' was already parsed.
253///
254///       using-directive: [C++ 7.3.p4: namespace.udir]
255///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
256///                 namespace-name ;
257/// [GNU] using-directive:
258///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
259///                 namespace-name attributes[opt] ;
260///
261Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
262                                              SourceLocation UsingLoc,
263                                              SourceLocation &DeclEnd,
264                                              AttributeList *Attr) {
265  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
266
267  // Eat 'namespace'.
268  SourceLocation NamespcLoc = ConsumeToken();
269
270  if (Tok.is(tok::code_completion)) {
271    Actions.CodeCompleteUsingDirective(getCurScope());
272    ConsumeCodeCompletionToken();
273  }
274
275  CXXScopeSpec SS;
276  // Parse (optional) nested-name-specifier.
277  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
278
279  IdentifierInfo *NamespcName = 0;
280  SourceLocation IdentLoc = SourceLocation();
281
282  // Parse namespace-name.
283  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
284    Diag(Tok, diag::err_expected_namespace_name);
285    // If there was invalid namespace name, skip to end of decl, and eat ';'.
286    SkipUntil(tok::semi);
287    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
288    return DeclPtrTy();
289  }
290
291  // Parse identifier.
292  NamespcName = Tok.getIdentifierInfo();
293  IdentLoc = ConsumeToken();
294
295  // Parse (optional) attributes (most likely GNU strong-using extension).
296  bool GNUAttr = false;
297  if (Tok.is(tok::kw___attribute)) {
298    GNUAttr = true;
299    Attr = addAttributeLists(Attr, ParseGNUAttributes());
300  }
301
302  // Eat ';'.
303  DeclEnd = Tok.getLocation();
304  ExpectAndConsume(tok::semi,
305                   GNUAttr ? diag::err_expected_semi_after_attribute_list :
306                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
307
308  return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
309                                      IdentLoc, NamespcName, Attr);
310}
311
312/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
313/// 'using' was already seen.
314///
315///     using-declaration: [C++ 7.3.p3: namespace.udecl]
316///       'using' 'typename'[opt] ::[opt] nested-name-specifier
317///               unqualified-id
318///       'using' :: unqualified-id
319///
320Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
321                                                SourceLocation UsingLoc,
322                                                SourceLocation &DeclEnd,
323                                                AccessSpecifier AS) {
324  CXXScopeSpec SS;
325  SourceLocation TypenameLoc;
326  bool IsTypeName;
327
328  // Ignore optional 'typename'.
329  // FIXME: This is wrong; we should parse this as a typename-specifier.
330  if (Tok.is(tok::kw_typename)) {
331    TypenameLoc = Tok.getLocation();
332    ConsumeToken();
333    IsTypeName = true;
334  }
335  else
336    IsTypeName = false;
337
338  // Parse nested-name-specifier.
339  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
340
341  // Check nested-name specifier.
342  if (SS.isInvalid()) {
343    SkipUntil(tok::semi);
344    return DeclPtrTy();
345  }
346
347  // Parse the unqualified-id. We allow parsing of both constructor and
348  // destructor names and allow the action module to diagnose any semantic
349  // errors.
350  UnqualifiedId Name;
351  if (ParseUnqualifiedId(SS,
352                         /*EnteringContext=*/false,
353                         /*AllowDestructorName=*/true,
354                         /*AllowConstructorName=*/true,
355                         /*ObjectType=*/0,
356                         Name)) {
357    SkipUntil(tok::semi);
358    return DeclPtrTy();
359  }
360
361  // Parse (optional) attributes (most likely GNU strong-using extension).
362  llvm::OwningPtr<AttributeList> AttrList;
363  if (Tok.is(tok::kw___attribute))
364    AttrList.reset(ParseGNUAttributes());
365
366  // Eat ';'.
367  DeclEnd = Tok.getLocation();
368  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
369                   AttrList ? "attributes list" : "using declaration",
370                   tok::semi);
371
372  return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, Name,
373                                       AttrList.get(), IsTypeName, TypenameLoc);
374}
375
376/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
377///
378///      static_assert-declaration:
379///        static_assert ( constant-expression  ,  string-literal  ) ;
380///
381Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
382  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
383  SourceLocation StaticAssertLoc = ConsumeToken();
384
385  if (Tok.isNot(tok::l_paren)) {
386    Diag(Tok, diag::err_expected_lparen);
387    return DeclPtrTy();
388  }
389
390  SourceLocation LParenLoc = ConsumeParen();
391
392  OwningExprResult AssertExpr(ParseConstantExpression());
393  if (AssertExpr.isInvalid()) {
394    SkipUntil(tok::semi);
395    return DeclPtrTy();
396  }
397
398  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
399    return DeclPtrTy();
400
401  if (Tok.isNot(tok::string_literal)) {
402    Diag(Tok, diag::err_expected_string_literal);
403    SkipUntil(tok::semi);
404    return DeclPtrTy();
405  }
406
407  OwningExprResult AssertMessage(ParseStringLiteralExpression());
408  if (AssertMessage.isInvalid())
409    return DeclPtrTy();
410
411  MatchRHSPunctuation(tok::r_paren, LParenLoc);
412
413  DeclEnd = Tok.getLocation();
414  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
415
416  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
417                                              move(AssertMessage));
418}
419
420/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
421///
422/// 'decltype' ( expression )
423///
424void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
425  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
426
427  SourceLocation StartLoc = ConsumeToken();
428  SourceLocation LParenLoc = Tok.getLocation();
429
430  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
431                       "decltype")) {
432    SkipUntil(tok::r_paren);
433    return;
434  }
435
436  // Parse the expression
437
438  // C++0x [dcl.type.simple]p4:
439  //   The operand of the decltype specifier is an unevaluated operand.
440  EnterExpressionEvaluationContext Unevaluated(Actions,
441                                               Action::Unevaluated);
442  OwningExprResult Result = ParseExpression();
443  if (Result.isInvalid()) {
444    SkipUntil(tok::r_paren);
445    return;
446  }
447
448  // Match the ')'
449  SourceLocation RParenLoc;
450  if (Tok.is(tok::r_paren))
451    RParenLoc = ConsumeParen();
452  else
453    MatchRHSPunctuation(tok::r_paren, LParenLoc);
454
455  if (RParenLoc.isInvalid())
456    return;
457
458  const char *PrevSpec = 0;
459  unsigned DiagID;
460  // Check for duplicate type specifiers (e.g. "int decltype(a)").
461  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
462                         DiagID, Result.release()))
463    Diag(StartLoc, DiagID) << PrevSpec;
464}
465
466/// ParseClassName - Parse a C++ class-name, which names a class. Note
467/// that we only check that the result names a type; semantic analysis
468/// will need to verify that the type names a class. The result is
469/// either a type or NULL, depending on whether a type name was
470/// found.
471///
472///       class-name: [C++ 9.1]
473///         identifier
474///         simple-template-id
475///
476Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
477                                          CXXScopeSpec *SS) {
478  // Check whether we have a template-id that names a type.
479  if (Tok.is(tok::annot_template_id)) {
480    TemplateIdAnnotation *TemplateId
481      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
482    if (TemplateId->Kind == TNK_Type_template ||
483        TemplateId->Kind == TNK_Dependent_template_name) {
484      AnnotateTemplateIdTokenAsType(SS);
485
486      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
487      TypeTy *Type = Tok.getAnnotationValue();
488      EndLocation = Tok.getAnnotationEndLoc();
489      ConsumeToken();
490
491      if (Type)
492        return Type;
493      return true;
494    }
495
496    // Fall through to produce an error below.
497  }
498
499  if (Tok.isNot(tok::identifier)) {
500    Diag(Tok, diag::err_expected_class_name);
501    return true;
502  }
503
504  IdentifierInfo *Id = Tok.getIdentifierInfo();
505  SourceLocation IdLoc = ConsumeToken();
506
507  if (Tok.is(tok::less)) {
508    // It looks the user intended to write a template-id here, but the
509    // template-name was wrong. Try to fix that.
510    TemplateNameKind TNK = TNK_Type_template;
511    TemplateTy Template;
512    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
513                                             SS, Template, TNK)) {
514      Diag(IdLoc, diag::err_unknown_template_name)
515        << Id;
516    }
517
518    if (!Template)
519      return true;
520
521    // Form the template name
522    UnqualifiedId TemplateName;
523    TemplateName.setIdentifier(Id, IdLoc);
524
525    // Parse the full template-id, then turn it into a type.
526    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
527                                SourceLocation(), true))
528      return true;
529    if (TNK == TNK_Dependent_template_name)
530      AnnotateTemplateIdTokenAsType(SS);
531
532    // If we didn't end up with a typename token, there's nothing more we
533    // can do.
534    if (Tok.isNot(tok::annot_typename))
535      return true;
536
537    // Retrieve the type from the annotation token, consume that token, and
538    // return.
539    EndLocation = Tok.getAnnotationEndLoc();
540    TypeTy *Type = Tok.getAnnotationValue();
541    ConsumeToken();
542    return Type;
543  }
544
545  // We have an identifier; check whether it is actually a type.
546  TypeTy *Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), SS, true);
547  if (!Type) {
548    Diag(IdLoc, diag::err_expected_class_name);
549    return true;
550  }
551
552  // Consume the identifier.
553  EndLocation = IdLoc;
554
555  // Fake up a Declarator to use with ActOnTypeName.
556  DeclSpec DS;
557  DS.SetRangeStart(IdLoc);
558  DS.SetRangeEnd(EndLocation);
559  DS.getTypeSpecScope() = *SS;
560
561  const char *PrevSpec = 0;
562  unsigned DiagID;
563  DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
564
565  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
566  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
567}
568
569/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
570/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
571/// until we reach the start of a definition or see a token that
572/// cannot start a definition. If SuppressDeclarations is true, we do know.
573///
574///       class-specifier: [C++ class]
575///         class-head '{' member-specification[opt] '}'
576///         class-head '{' member-specification[opt] '}' attributes[opt]
577///       class-head:
578///         class-key identifier[opt] base-clause[opt]
579///         class-key nested-name-specifier identifier base-clause[opt]
580///         class-key nested-name-specifier[opt] simple-template-id
581///                          base-clause[opt]
582/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
583/// [GNU]   class-key attributes[opt] nested-name-specifier
584///                          identifier base-clause[opt]
585/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
586///                          simple-template-id base-clause[opt]
587///       class-key:
588///         'class'
589///         'struct'
590///         'union'
591///
592///       elaborated-type-specifier: [C++ dcl.type.elab]
593///         class-key ::[opt] nested-name-specifier[opt] identifier
594///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
595///                          simple-template-id
596///
597///  Note that the C++ class-specifier and elaborated-type-specifier,
598///  together, subsume the C99 struct-or-union-specifier:
599///
600///       struct-or-union-specifier: [C99 6.7.2.1]
601///         struct-or-union identifier[opt] '{' struct-contents '}'
602///         struct-or-union identifier
603/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
604///                                                         '}' attributes[opt]
605/// [GNU]   struct-or-union attributes[opt] identifier
606///       struct-or-union:
607///         'struct'
608///         'union'
609void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
610                                 SourceLocation StartLoc, DeclSpec &DS,
611                                 const ParsedTemplateInfo &TemplateInfo,
612                                 AccessSpecifier AS, bool SuppressDeclarations){
613  DeclSpec::TST TagType;
614  if (TagTokKind == tok::kw_struct)
615    TagType = DeclSpec::TST_struct;
616  else if (TagTokKind == tok::kw_class)
617    TagType = DeclSpec::TST_class;
618  else {
619    assert(TagTokKind == tok::kw_union && "Not a class specifier");
620    TagType = DeclSpec::TST_union;
621  }
622
623  if (Tok.is(tok::code_completion)) {
624    // Code completion for a struct, class, or union name.
625    Actions.CodeCompleteTag(getCurScope(), TagType);
626    ConsumeCodeCompletionToken();
627  }
628
629  // C++03 [temp.explicit] 14.7.2/8:
630  //   The usual access checking rules do not apply to names used to specify
631  //   explicit instantiations.
632  //
633  // As an extension we do not perform access checking on the names used to
634  // specify explicit specializations either. This is important to allow
635  // specializing traits classes for private types.
636  bool SuppressingAccessChecks = false;
637  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
638      TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) {
639    Actions.ActOnStartSuppressingAccessChecks();
640    SuppressingAccessChecks = true;
641  }
642
643  AttributeList *AttrList = 0;
644  // If attributes exist after tag, parse them.
645  if (Tok.is(tok::kw___attribute))
646    AttrList = ParseGNUAttributes();
647
648  // If declspecs exist after tag, parse them.
649  if (Tok.is(tok::kw___declspec))
650    AttrList = ParseMicrosoftDeclSpec(AttrList);
651
652  // If C++0x attributes exist here, parse them.
653  // FIXME: Are we consistent with the ordering of parsing of different
654  // styles of attributes?
655  if (isCXX0XAttributeSpecifier())
656    AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
657
658  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
659    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
660    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
661    // token sequence "struct __is_pod", make __is_pod into a normal
662    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
663    // properly.
664    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
665    Tok.setKind(tok::identifier);
666  }
667
668  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
669    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
670    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
671    // token sequence "struct __is_empty", make __is_empty into a normal
672    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
673    // properly.
674    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
675    Tok.setKind(tok::identifier);
676  }
677
678  // Parse the (optional) nested-name-specifier.
679  CXXScopeSpec &SS = DS.getTypeSpecScope();
680  if (getLang().CPlusPlus) {
681    // "FOO : BAR" is not a potential typo for "FOO::BAR".
682    ColonProtectionRAIIObject X(*this);
683
684    if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true))
685      DS.SetTypeSpecError();
686    if (SS.isSet())
687      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
688        Diag(Tok, diag::err_expected_ident);
689  }
690
691  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
692
693  // Parse the (optional) class name or simple-template-id.
694  IdentifierInfo *Name = 0;
695  SourceLocation NameLoc;
696  TemplateIdAnnotation *TemplateId = 0;
697  if (Tok.is(tok::identifier)) {
698    Name = Tok.getIdentifierInfo();
699    NameLoc = ConsumeToken();
700
701    if (Tok.is(tok::less) && getLang().CPlusPlus) {
702      // The name was supposed to refer to a template, but didn't.
703      // Eat the template argument list and try to continue parsing this as
704      // a class (or template thereof).
705      TemplateArgList TemplateArgs;
706      SourceLocation LAngleLoc, RAngleLoc;
707      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
708                                           true, LAngleLoc,
709                                           TemplateArgs, RAngleLoc)) {
710        // We couldn't parse the template argument list at all, so don't
711        // try to give any location information for the list.
712        LAngleLoc = RAngleLoc = SourceLocation();
713      }
714
715      Diag(NameLoc, diag::err_explicit_spec_non_template)
716        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
717        << (TagType == DeclSpec::TST_class? 0
718            : TagType == DeclSpec::TST_struct? 1
719            : 2)
720        << Name
721        << SourceRange(LAngleLoc, RAngleLoc);
722
723      // Strip off the last template parameter list if it was empty, since
724      // we've removed its template argument list.
725      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
726        if (TemplateParams && TemplateParams->size() > 1) {
727          TemplateParams->pop_back();
728        } else {
729          TemplateParams = 0;
730          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
731            = ParsedTemplateInfo::NonTemplate;
732        }
733      } else if (TemplateInfo.Kind
734                                == ParsedTemplateInfo::ExplicitInstantiation) {
735        // Pretend this is just a forward declaration.
736        TemplateParams = 0;
737        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
738          = ParsedTemplateInfo::NonTemplate;
739        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
740          = SourceLocation();
741        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
742          = SourceLocation();
743      }
744    }
745  } else if (Tok.is(tok::annot_template_id)) {
746    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
747    NameLoc = ConsumeToken();
748
749    if (TemplateId->Kind != TNK_Type_template) {
750      // The template-name in the simple-template-id refers to
751      // something other than a class template. Give an appropriate
752      // error message and skip to the ';'.
753      SourceRange Range(NameLoc);
754      if (SS.isNotEmpty())
755        Range.setBegin(SS.getBeginLoc());
756
757      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
758        << Name << static_cast<int>(TemplateId->Kind) << Range;
759
760      DS.SetTypeSpecError();
761      SkipUntil(tok::semi, false, true);
762      TemplateId->Destroy();
763      if (SuppressingAccessChecks)
764        Actions.ActOnStopSuppressingAccessChecks();
765
766      return;
767    }
768  }
769
770  // As soon as we're finished parsing the class's template-id, turn access
771  // checking back on.
772  if (SuppressingAccessChecks)
773    Actions.ActOnStopSuppressingAccessChecks();
774
775  // There are four options here.  If we have 'struct foo;', then this
776  // is either a forward declaration or a friend declaration, which
777  // have to be treated differently.  If we have 'struct foo {...' or
778  // 'struct foo :...' then this is a definition. Otherwise we have
779  // something like 'struct foo xyz', a reference.
780  // However, in some contexts, things look like declarations but are just
781  // references, e.g.
782  // new struct s;
783  // or
784  // &T::operator struct s;
785  // For these, SuppressDeclarations is true.
786  Action::TagUseKind TUK;
787  if (SuppressDeclarations)
788    TUK = Action::TUK_Reference;
789  else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
790    if (DS.isFriendSpecified()) {
791      // C++ [class.friend]p2:
792      //   A class shall not be defined in a friend declaration.
793      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
794        << SourceRange(DS.getFriendSpecLoc());
795
796      // Skip everything up to the semicolon, so that this looks like a proper
797      // friend class (or template thereof) declaration.
798      SkipUntil(tok::semi, true, true);
799      TUK = Action::TUK_Friend;
800    } else {
801      // Okay, this is a class definition.
802      TUK = Action::TUK_Definition;
803    }
804  } else if (Tok.is(tok::semi))
805    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
806  else
807    TUK = Action::TUK_Reference;
808
809  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
810                               TUK != Action::TUK_Definition)) {
811    if (DS.getTypeSpecType() != DeclSpec::TST_error) {
812      // We have a declaration or reference to an anonymous class.
813      Diag(StartLoc, diag::err_anon_type_definition)
814        << DeclSpec::getSpecifierName(TagType);
815    }
816
817    SkipUntil(tok::comma, true);
818
819    if (TemplateId)
820      TemplateId->Destroy();
821    return;
822  }
823
824  // Create the tag portion of the class or class template.
825  Action::DeclResult TagOrTempResult = true; // invalid
826  Action::TypeResult TypeResult = true; // invalid
827
828  bool Owned = false;
829  if (TemplateId) {
830    // Explicit specialization, class template partial specialization,
831    // or explicit instantiation.
832    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
833                                       TemplateId->getTemplateArgs(),
834                                       TemplateId->NumArgs);
835    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
836        TUK == Action::TUK_Declaration) {
837      // This is an explicit instantiation of a class template.
838      TagOrTempResult
839        = Actions.ActOnExplicitInstantiation(getCurScope(),
840                                             TemplateInfo.ExternLoc,
841                                             TemplateInfo.TemplateLoc,
842                                             TagType,
843                                             StartLoc,
844                                             SS,
845                                     TemplateTy::make(TemplateId->Template),
846                                             TemplateId->TemplateNameLoc,
847                                             TemplateId->LAngleLoc,
848                                             TemplateArgsPtr,
849                                             TemplateId->RAngleLoc,
850                                             AttrList);
851
852    // Friend template-ids are treated as references unless
853    // they have template headers, in which case they're ill-formed
854    // (FIXME: "template <class T> friend class A<T>::B<int>;").
855    // We diagnose this error in ActOnClassTemplateSpecialization.
856    } else if (TUK == Action::TUK_Reference ||
857               (TUK == Action::TUK_Friend &&
858                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
859      TypeResult
860        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
861                                      TemplateId->TemplateNameLoc,
862                                      TemplateId->LAngleLoc,
863                                      TemplateArgsPtr,
864                                      TemplateId->RAngleLoc);
865
866      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
867                                                  TagType, StartLoc);
868    } else {
869      // This is an explicit specialization or a class template
870      // partial specialization.
871      TemplateParameterLists FakedParamLists;
872
873      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
874        // This looks like an explicit instantiation, because we have
875        // something like
876        //
877        //   template class Foo<X>
878        //
879        // but it actually has a definition. Most likely, this was
880        // meant to be an explicit specialization, but the user forgot
881        // the '<>' after 'template'.
882        assert(TUK == Action::TUK_Definition && "Expected a definition here");
883
884        SourceLocation LAngleLoc
885          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
886        Diag(TemplateId->TemplateNameLoc,
887             diag::err_explicit_instantiation_with_definition)
888          << SourceRange(TemplateInfo.TemplateLoc)
889          << FixItHint::CreateInsertion(LAngleLoc, "<>");
890
891        // Create a fake template parameter list that contains only
892        // "template<>", so that we treat this construct as a class
893        // template specialization.
894        FakedParamLists.push_back(
895          Actions.ActOnTemplateParameterList(0, SourceLocation(),
896                                             TemplateInfo.TemplateLoc,
897                                             LAngleLoc,
898                                             0, 0,
899                                             LAngleLoc));
900        TemplateParams = &FakedParamLists;
901      }
902
903      // Build the class template specialization.
904      TagOrTempResult
905        = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
906                       StartLoc, SS,
907                       TemplateTy::make(TemplateId->Template),
908                       TemplateId->TemplateNameLoc,
909                       TemplateId->LAngleLoc,
910                       TemplateArgsPtr,
911                       TemplateId->RAngleLoc,
912                       AttrList,
913                       Action::MultiTemplateParamsArg(Actions,
914                                    TemplateParams? &(*TemplateParams)[0] : 0,
915                                 TemplateParams? TemplateParams->size() : 0));
916    }
917    TemplateId->Destroy();
918  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
919             TUK == Action::TUK_Declaration) {
920    // Explicit instantiation of a member of a class template
921    // specialization, e.g.,
922    //
923    //   template struct Outer<int>::Inner;
924    //
925    TagOrTempResult
926      = Actions.ActOnExplicitInstantiation(getCurScope(),
927                                           TemplateInfo.ExternLoc,
928                                           TemplateInfo.TemplateLoc,
929                                           TagType, StartLoc, SS, Name,
930                                           NameLoc, AttrList);
931  } else {
932    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
933        TUK == Action::TUK_Definition) {
934      // FIXME: Diagnose this particular error.
935    }
936
937    bool IsDependent = false;
938
939    // Declaration or definition of a class type
940    TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, SS,
941                                       Name, NameLoc, AttrList, AS,
942                                  Action::MultiTemplateParamsArg(Actions,
943                                    TemplateParams? &(*TemplateParams)[0] : 0,
944                                    TemplateParams? TemplateParams->size() : 0),
945                                       Owned, IsDependent);
946
947    // If ActOnTag said the type was dependent, try again with the
948    // less common call.
949    if (IsDependent)
950      TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
951                                             SS, Name, StartLoc, NameLoc);
952  }
953
954  // If there is a body, parse it and inform the actions module.
955  if (TUK == Action::TUK_Definition) {
956    assert(Tok.is(tok::l_brace) ||
957           (getLang().CPlusPlus && Tok.is(tok::colon)));
958    if (getLang().CPlusPlus)
959      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
960    else
961      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
962  }
963
964  void *Result;
965  if (!TypeResult.isInvalid()) {
966    TagType = DeclSpec::TST_typename;
967    Result = TypeResult.get();
968    Owned = false;
969  } else if (!TagOrTempResult.isInvalid()) {
970    Result = TagOrTempResult.get().getAs<void>();
971  } else {
972    DS.SetTypeSpecError();
973    return;
974  }
975
976  const char *PrevSpec = 0;
977  unsigned DiagID;
978
979  // FIXME: The DeclSpec should keep the locations of both the keyword and the
980  // name (if there is one).
981  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
982
983  if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
984                         Result, Owned))
985    Diag(StartLoc, DiagID) << PrevSpec;
986
987  // At this point, we've successfully parsed a class-specifier in 'definition'
988  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
989  // going to look at what comes after it to improve error recovery.  If an
990  // impossible token occurs next, we assume that the programmer forgot a ; at
991  // the end of the declaration and recover that way.
992  //
993  // This switch enumerates the valid "follow" set for definition.
994  if (TUK == Action::TUK_Definition) {
995    bool ExpectedSemi = true;
996    switch (Tok.getKind()) {
997    default: break;
998    case tok::semi:               // struct foo {...} ;
999    case tok::star:               // struct foo {...} *         P;
1000    case tok::amp:                // struct foo {...} &         R = ...
1001    case tok::identifier:         // struct foo {...} V         ;
1002    case tok::r_paren:            //(struct foo {...} )         {4}
1003    case tok::annot_cxxscope:     // struct foo {...} a::       b;
1004    case tok::annot_typename:     // struct foo {...} a         ::b;
1005    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
1006    case tok::l_paren:            // struct foo {...} (         x);
1007    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
1008      ExpectedSemi = false;
1009      break;
1010    // Type qualifiers
1011    case tok::kw_const:           // struct foo {...} const     x;
1012    case tok::kw_volatile:        // struct foo {...} volatile  x;
1013    case tok::kw_restrict:        // struct foo {...} restrict  x;
1014    case tok::kw_inline:          // struct foo {...} inline    foo() {};
1015    // Storage-class specifiers
1016    case tok::kw_static:          // struct foo {...} static    x;
1017    case tok::kw_extern:          // struct foo {...} extern    x;
1018    case tok::kw_typedef:         // struct foo {...} typedef   x;
1019    case tok::kw_register:        // struct foo {...} register  x;
1020    case tok::kw_auto:            // struct foo {...} auto      x;
1021    case tok::kw_mutable:         // struct foo {...} mutable      x;
1022      // As shown above, type qualifiers and storage class specifiers absolutely
1023      // can occur after class specifiers according to the grammar.  However,
1024      // almost noone actually writes code like this.  If we see one of these,
1025      // it is much more likely that someone missed a semi colon and the
1026      // type/storage class specifier we're seeing is part of the *next*
1027      // intended declaration, as in:
1028      //
1029      //   struct foo { ... }
1030      //   typedef int X;
1031      //
1032      // We'd really like to emit a missing semicolon error instead of emitting
1033      // an error on the 'int' saying that you can't have two type specifiers in
1034      // the same declaration of X.  Because of this, we look ahead past this
1035      // token to see if it's a type specifier.  If so, we know the code is
1036      // otherwise invalid, so we can produce the expected semi error.
1037      if (!isKnownToBeTypeSpecifier(NextToken()))
1038        ExpectedSemi = false;
1039      break;
1040
1041    case tok::r_brace:  // struct bar { struct foo {...} }
1042      // Missing ';' at end of struct is accepted as an extension in C mode.
1043      if (!getLang().CPlusPlus)
1044        ExpectedSemi = false;
1045      break;
1046    }
1047
1048    if (ExpectedSemi) {
1049      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1050                       TagType == DeclSpec::TST_class ? "class"
1051                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1052      // Push this token back into the preprocessor and change our current token
1053      // to ';' so that the rest of the code recovers as though there were an
1054      // ';' after the definition.
1055      PP.EnterToken(Tok);
1056      Tok.setKind(tok::semi);
1057    }
1058  }
1059}
1060
1061/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1062///
1063///       base-clause : [C++ class.derived]
1064///         ':' base-specifier-list
1065///       base-specifier-list:
1066///         base-specifier '...'[opt]
1067///         base-specifier-list ',' base-specifier '...'[opt]
1068void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
1069  assert(Tok.is(tok::colon) && "Not a base clause");
1070  ConsumeToken();
1071
1072  // Build up an array of parsed base specifiers.
1073  llvm::SmallVector<BaseTy *, 8> BaseInfo;
1074
1075  while (true) {
1076    // Parse a base-specifier.
1077    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1078    if (Result.isInvalid()) {
1079      // Skip the rest of this base specifier, up until the comma or
1080      // opening brace.
1081      SkipUntil(tok::comma, tok::l_brace, true, true);
1082    } else {
1083      // Add this to our array of base specifiers.
1084      BaseInfo.push_back(Result.get());
1085    }
1086
1087    // If the next token is a comma, consume it and keep reading
1088    // base-specifiers.
1089    if (Tok.isNot(tok::comma)) break;
1090
1091    // Consume the comma.
1092    ConsumeToken();
1093  }
1094
1095  // Attach the base specifiers
1096  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1097}
1098
1099/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1100/// one entry in the base class list of a class specifier, for example:
1101///    class foo : public bar, virtual private baz {
1102/// 'public bar' and 'virtual private baz' are each base-specifiers.
1103///
1104///       base-specifier: [C++ class.derived]
1105///         ::[opt] nested-name-specifier[opt] class-name
1106///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1107///                        class-name
1108///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1109///                        class-name
1110Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
1111  bool IsVirtual = false;
1112  SourceLocation StartLoc = Tok.getLocation();
1113
1114  // Parse the 'virtual' keyword.
1115  if (Tok.is(tok::kw_virtual))  {
1116    ConsumeToken();
1117    IsVirtual = true;
1118  }
1119
1120  // Parse an (optional) access specifier.
1121  AccessSpecifier Access = getAccessSpecifierIfPresent();
1122  if (Access != AS_none)
1123    ConsumeToken();
1124
1125  // Parse the 'virtual' keyword (again!), in case it came after the
1126  // access specifier.
1127  if (Tok.is(tok::kw_virtual))  {
1128    SourceLocation VirtualLoc = ConsumeToken();
1129    if (IsVirtual) {
1130      // Complain about duplicate 'virtual'
1131      Diag(VirtualLoc, diag::err_dup_virtual)
1132        << FixItHint::CreateRemoval(VirtualLoc);
1133    }
1134
1135    IsVirtual = true;
1136  }
1137
1138  // Parse optional '::' and optional nested-name-specifier.
1139  CXXScopeSpec SS;
1140  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0,
1141                                 /*EnteringContext=*/false);
1142
1143  // The location of the base class itself.
1144  SourceLocation BaseLoc = Tok.getLocation();
1145
1146  // Parse the class-name.
1147  SourceLocation EndLocation;
1148  TypeResult BaseType = ParseClassName(EndLocation, &SS);
1149  if (BaseType.isInvalid())
1150    return true;
1151
1152  // Find the complete source range for the base-specifier.
1153  SourceRange Range(StartLoc, EndLocation);
1154
1155  // Notify semantic analysis that we have parsed a complete
1156  // base-specifier.
1157  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1158                                    BaseType.get(), BaseLoc);
1159}
1160
1161/// getAccessSpecifierIfPresent - Determine whether the next token is
1162/// a C++ access-specifier.
1163///
1164///       access-specifier: [C++ class.derived]
1165///         'private'
1166///         'protected'
1167///         'public'
1168AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1169  switch (Tok.getKind()) {
1170  default: return AS_none;
1171  case tok::kw_private: return AS_private;
1172  case tok::kw_protected: return AS_protected;
1173  case tok::kw_public: return AS_public;
1174  }
1175}
1176
1177void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1178                                             DeclPtrTy ThisDecl) {
1179  // We just declared a member function. If this member function
1180  // has any default arguments, we'll need to parse them later.
1181  LateParsedMethodDeclaration *LateMethod = 0;
1182  DeclaratorChunk::FunctionTypeInfo &FTI
1183    = DeclaratorInfo.getTypeObject(0).Fun;
1184  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1185    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1186      if (!LateMethod) {
1187        // Push this method onto the stack of late-parsed method
1188        // declarations.
1189        getCurrentClass().MethodDecls.push_back(
1190                                LateParsedMethodDeclaration(ThisDecl));
1191        LateMethod = &getCurrentClass().MethodDecls.back();
1192        LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1193
1194        // Add all of the parameters prior to this one (they don't
1195        // have default arguments).
1196        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1197        for (unsigned I = 0; I < ParamIdx; ++I)
1198          LateMethod->DefaultArgs.push_back(
1199                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1200      }
1201
1202      // Add this parameter to the list of parameters (it or may
1203      // not have a default argument).
1204      LateMethod->DefaultArgs.push_back(
1205        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1206                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1207    }
1208  }
1209}
1210
1211/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1212///
1213///       member-declaration:
1214///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1215///         function-definition ';'[opt]
1216///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1217///         using-declaration                                            [TODO]
1218/// [C++0x] static_assert-declaration
1219///         template-declaration
1220/// [GNU]   '__extension__' member-declaration
1221///
1222///       member-declarator-list:
1223///         member-declarator
1224///         member-declarator-list ',' member-declarator
1225///
1226///       member-declarator:
1227///         declarator pure-specifier[opt]
1228///         declarator constant-initializer[opt]
1229///         identifier[opt] ':' constant-expression
1230///
1231///       pure-specifier:
1232///         '= 0'
1233///
1234///       constant-initializer:
1235///         '=' constant-expression
1236///
1237void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1238                                       const ParsedTemplateInfo &TemplateInfo,
1239                                       ParsingDeclRAIIObject *TemplateDiags) {
1240  // Access declarations.
1241  if (!TemplateInfo.Kind &&
1242      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1243      !TryAnnotateCXXScopeToken() &&
1244      Tok.is(tok::annot_cxxscope)) {
1245    bool isAccessDecl = false;
1246    if (NextToken().is(tok::identifier))
1247      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1248    else
1249      isAccessDecl = NextToken().is(tok::kw_operator);
1250
1251    if (isAccessDecl) {
1252      // Collect the scope specifier token we annotated earlier.
1253      CXXScopeSpec SS;
1254      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
1255
1256      // Try to parse an unqualified-id.
1257      UnqualifiedId Name;
1258      if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
1259        SkipUntil(tok::semi);
1260        return;
1261      }
1262
1263      // TODO: recover from mistakenly-qualified operator declarations.
1264      if (ExpectAndConsume(tok::semi,
1265                           diag::err_expected_semi_after,
1266                           "access declaration",
1267                           tok::semi))
1268        return;
1269
1270      Actions.ActOnUsingDeclaration(getCurScope(), AS,
1271                                    false, SourceLocation(),
1272                                    SS, Name,
1273                                    /* AttrList */ 0,
1274                                    /* IsTypeName */ false,
1275                                    SourceLocation());
1276      return;
1277    }
1278  }
1279
1280  // static_assert-declaration
1281  if (Tok.is(tok::kw_static_assert)) {
1282    // FIXME: Check for templates
1283    SourceLocation DeclEnd;
1284    ParseStaticAssertDeclaration(DeclEnd);
1285    return;
1286  }
1287
1288  if (Tok.is(tok::kw_template)) {
1289    assert(!TemplateInfo.TemplateParams &&
1290           "Nested template improperly parsed?");
1291    SourceLocation DeclEnd;
1292    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1293                                         AS);
1294    return;
1295  }
1296
1297  // Handle:  member-declaration ::= '__extension__' member-declaration
1298  if (Tok.is(tok::kw___extension__)) {
1299    // __extension__ silences extension warnings in the subexpression.
1300    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1301    ConsumeToken();
1302    return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags);
1303  }
1304
1305  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1306  // is a bitfield.
1307  ColonProtectionRAIIObject X(*this);
1308
1309  CXX0XAttributeList AttrList;
1310  // Optional C++0x attribute-specifier
1311  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1312    AttrList = ParseCXX0XAttributes();
1313
1314  if (Tok.is(tok::kw_using)) {
1315    // FIXME: Check for template aliases
1316
1317    if (AttrList.HasAttr)
1318      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1319        << AttrList.Range;
1320
1321    // Eat 'using'.
1322    SourceLocation UsingLoc = ConsumeToken();
1323
1324    if (Tok.is(tok::kw_namespace)) {
1325      Diag(UsingLoc, diag::err_using_namespace_in_class);
1326      SkipUntil(tok::semi, true, true);
1327    } else {
1328      SourceLocation DeclEnd;
1329      // Otherwise, it must be using-declaration.
1330      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1331    }
1332    return;
1333  }
1334
1335  SourceLocation DSStart = Tok.getLocation();
1336  // decl-specifier-seq:
1337  // Parse the common declaration-specifiers piece.
1338  ParsingDeclSpec DS(*this, TemplateDiags);
1339  DS.AddAttributes(AttrList.AttrList);
1340  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1341
1342  Action::MultiTemplateParamsArg TemplateParams(Actions,
1343      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1344      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1345
1346  if (Tok.is(tok::semi)) {
1347    ConsumeToken();
1348    DeclPtrTy TheDecl =
1349      Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
1350    DS.complete(TheDecl);
1351    return;
1352  }
1353
1354  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1355
1356  if (Tok.isNot(tok::colon)) {
1357    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1358    ColonProtectionRAIIObject X(*this);
1359
1360    // Parse the first declarator.
1361    ParseDeclarator(DeclaratorInfo);
1362    // Error parsing the declarator?
1363    if (!DeclaratorInfo.hasName()) {
1364      // If so, skip until the semi-colon or a }.
1365      SkipUntil(tok::r_brace, true);
1366      if (Tok.is(tok::semi))
1367        ConsumeToken();
1368      return;
1369    }
1370
1371    // If attributes exist after the declarator, but before an '{', parse them.
1372    if (Tok.is(tok::kw___attribute)) {
1373      SourceLocation Loc;
1374      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1375      DeclaratorInfo.AddAttributes(AttrList, Loc);
1376    }
1377
1378    // function-definition:
1379    if (Tok.is(tok::l_brace)
1380        || (DeclaratorInfo.isFunctionDeclarator() &&
1381            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1382      if (!DeclaratorInfo.isFunctionDeclarator()) {
1383        Diag(Tok, diag::err_func_def_no_params);
1384        ConsumeBrace();
1385        SkipUntil(tok::r_brace, true);
1386        return;
1387      }
1388
1389      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1390        Diag(Tok, diag::err_function_declared_typedef);
1391        // This recovery skips the entire function body. It would be nice
1392        // to simply call ParseCXXInlineMethodDef() below, however Sema
1393        // assumes the declarator represents a function, not a typedef.
1394        ConsumeBrace();
1395        SkipUntil(tok::r_brace, true);
1396        return;
1397      }
1398
1399      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1400      return;
1401    }
1402  }
1403
1404  // member-declarator-list:
1405  //   member-declarator
1406  //   member-declarator-list ',' member-declarator
1407
1408  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1409  OwningExprResult BitfieldSize(Actions);
1410  OwningExprResult Init(Actions);
1411  bool Deleted = false;
1412
1413  while (1) {
1414    // member-declarator:
1415    //   declarator pure-specifier[opt]
1416    //   declarator constant-initializer[opt]
1417    //   identifier[opt] ':' constant-expression
1418    if (Tok.is(tok::colon)) {
1419      ConsumeToken();
1420      BitfieldSize = ParseConstantExpression();
1421      if (BitfieldSize.isInvalid())
1422        SkipUntil(tok::comma, true, true);
1423    }
1424
1425    // pure-specifier:
1426    //   '= 0'
1427    //
1428    // constant-initializer:
1429    //   '=' constant-expression
1430    //
1431    // defaulted/deleted function-definition:
1432    //   '=' 'default'                          [TODO]
1433    //   '=' 'delete'
1434    if (Tok.is(tok::equal)) {
1435      ConsumeToken();
1436      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1437        ConsumeToken();
1438        Deleted = true;
1439      } else {
1440        Init = ParseInitializer();
1441        if (Init.isInvalid())
1442          SkipUntil(tok::comma, true, true);
1443      }
1444    }
1445
1446    // If a simple-asm-expr is present, parse it.
1447    if (Tok.is(tok::kw_asm)) {
1448      SourceLocation Loc;
1449      OwningExprResult AsmLabel(ParseSimpleAsm(&Loc));
1450      if (AsmLabel.isInvalid())
1451        SkipUntil(tok::comma, true, true);
1452
1453      DeclaratorInfo.setAsmLabel(AsmLabel.release());
1454      DeclaratorInfo.SetRangeEnd(Loc);
1455    }
1456
1457    // If attributes exist after the declarator, parse them.
1458    if (Tok.is(tok::kw___attribute)) {
1459      SourceLocation Loc;
1460      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1461      DeclaratorInfo.AddAttributes(AttrList, Loc);
1462    }
1463
1464    // NOTE: If Sema is the Action module and declarator is an instance field,
1465    // this call will *not* return the created decl; It will return null.
1466    // See Sema::ActOnCXXMemberDeclarator for details.
1467
1468    DeclPtrTy ThisDecl;
1469    if (DS.isFriendSpecified()) {
1470      // TODO: handle initializers, bitfields, 'delete'
1471      ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
1472                                                 /*IsDefinition*/ false,
1473                                                 move(TemplateParams));
1474    } else {
1475      ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
1476                                                  DeclaratorInfo,
1477                                                  move(TemplateParams),
1478                                                  BitfieldSize.release(),
1479                                                  Init.release(),
1480                                                  /*IsDefinition*/Deleted,
1481                                                  Deleted);
1482    }
1483    if (ThisDecl)
1484      DeclsInGroup.push_back(ThisDecl);
1485
1486    if (DeclaratorInfo.isFunctionDeclarator() &&
1487        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1488          != DeclSpec::SCS_typedef) {
1489      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1490    }
1491
1492    DeclaratorInfo.complete(ThisDecl);
1493
1494    // If we don't have a comma, it is either the end of the list (a ';')
1495    // or an error, bail out.
1496    if (Tok.isNot(tok::comma))
1497      break;
1498
1499    // Consume the comma.
1500    ConsumeToken();
1501
1502    // Parse the next declarator.
1503    DeclaratorInfo.clear();
1504    BitfieldSize = 0;
1505    Init = 0;
1506    Deleted = false;
1507
1508    // Attributes are only allowed on the second declarator.
1509    if (Tok.is(tok::kw___attribute)) {
1510      SourceLocation Loc;
1511      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1512      DeclaratorInfo.AddAttributes(AttrList, Loc);
1513    }
1514
1515    if (Tok.isNot(tok::colon))
1516      ParseDeclarator(DeclaratorInfo);
1517  }
1518
1519  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1520    // Skip to end of block or statement.
1521    SkipUntil(tok::r_brace, true, true);
1522    // If we stopped at a ';', eat it.
1523    if (Tok.is(tok::semi)) ConsumeToken();
1524    return;
1525  }
1526
1527  Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
1528                                  DeclsInGroup.size());
1529}
1530
1531/// ParseCXXMemberSpecification - Parse the class definition.
1532///
1533///       member-specification:
1534///         member-declaration member-specification[opt]
1535///         access-specifier ':' member-specification[opt]
1536///
1537void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1538                                         unsigned TagType, DeclPtrTy TagDecl) {
1539  assert((TagType == DeclSpec::TST_struct ||
1540         TagType == DeclSpec::TST_union  ||
1541         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1542
1543  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1544                                        PP.getSourceManager(),
1545                                        "parsing struct/union/class body");
1546
1547  // Determine whether this is a non-nested class. Note that local
1548  // classes are *not* considered to be nested classes.
1549  bool NonNestedClass = true;
1550  if (!ClassStack.empty()) {
1551    for (const Scope *S = getCurScope(); S; S = S->getParent()) {
1552      if (S->isClassScope()) {
1553        // We're inside a class scope, so this is a nested class.
1554        NonNestedClass = false;
1555        break;
1556      }
1557
1558      if ((S->getFlags() & Scope::FnScope)) {
1559        // If we're in a function or function template declared in the
1560        // body of a class, then this is a local class rather than a
1561        // nested class.
1562        const Scope *Parent = S->getParent();
1563        if (Parent->isTemplateParamScope())
1564          Parent = Parent->getParent();
1565        if (Parent->isClassScope())
1566          break;
1567      }
1568    }
1569  }
1570
1571  // Enter a scope for the class.
1572  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1573
1574  // Note that we are parsing a new (potentially-nested) class definition.
1575  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1576
1577  if (TagDecl)
1578    Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
1579
1580  if (Tok.is(tok::colon)) {
1581    ParseBaseClause(TagDecl);
1582
1583    if (!Tok.is(tok::l_brace)) {
1584      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1585
1586      if (TagDecl)
1587        Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
1588      return;
1589    }
1590  }
1591
1592  assert(Tok.is(tok::l_brace));
1593
1594  SourceLocation LBraceLoc = ConsumeBrace();
1595
1596  if (TagDecl)
1597    Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, LBraceLoc);
1598
1599  // C++ 11p3: Members of a class defined with the keyword class are private
1600  // by default. Members of a class defined with the keywords struct or union
1601  // are public by default.
1602  AccessSpecifier CurAS;
1603  if (TagType == DeclSpec::TST_class)
1604    CurAS = AS_private;
1605  else
1606    CurAS = AS_public;
1607
1608  SourceLocation RBraceLoc;
1609  if (TagDecl) {
1610    // While we still have something to read, read the member-declarations.
1611    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1612      // Each iteration of this loop reads one member-declaration.
1613
1614      // Check for extraneous top-level semicolon.
1615      if (Tok.is(tok::semi)) {
1616        Diag(Tok, diag::ext_extra_struct_semi)
1617          << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
1618          << FixItHint::CreateRemoval(Tok.getLocation());
1619        ConsumeToken();
1620        continue;
1621      }
1622
1623      AccessSpecifier AS = getAccessSpecifierIfPresent();
1624      if (AS != AS_none) {
1625        // Current token is a C++ access specifier.
1626        CurAS = AS;
1627        SourceLocation ASLoc = Tok.getLocation();
1628        ConsumeToken();
1629        if (Tok.is(tok::colon))
1630          Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
1631        else
1632          Diag(Tok, diag::err_expected_colon);
1633        ConsumeToken();
1634        continue;
1635      }
1636
1637      // FIXME: Make sure we don't have a template here.
1638
1639      // Parse all the comma separated declarators.
1640      ParseCXXClassMemberDeclaration(CurAS);
1641    }
1642
1643    RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1644  } else {
1645    SkipUntil(tok::r_brace, false, false);
1646  }
1647
1648  // If attributes exist after class contents, parse them.
1649  llvm::OwningPtr<AttributeList> AttrList;
1650  if (Tok.is(tok::kw___attribute))
1651    AttrList.reset(ParseGNUAttributes());
1652
1653  if (TagDecl)
1654    Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
1655                                              LBraceLoc, RBraceLoc,
1656                                              AttrList.get());
1657
1658  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1659  // complete within function bodies, default arguments,
1660  // exception-specifications, and constructor ctor-initializers (including
1661  // such things in nested classes).
1662  //
1663  // FIXME: Only function bodies and constructor ctor-initializers are
1664  // parsed correctly, fix the rest.
1665  if (TagDecl && NonNestedClass) {
1666    // We are not inside a nested class. This class and its nested classes
1667    // are complete and we can parse the delayed portions of method
1668    // declarations and the lexed inline method definitions.
1669    SourceLocation SavedPrevTokLocation = PrevTokLocation;
1670    ParseLexedMethodDeclarations(getCurrentClass());
1671    ParseLexedMethodDefs(getCurrentClass());
1672    PrevTokLocation = SavedPrevTokLocation;
1673  }
1674
1675  if (TagDecl)
1676    Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc);
1677
1678  // Leave the class scope.
1679  ParsingDef.Pop();
1680  ClassScope.Exit();
1681}
1682
1683/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1684/// which explicitly initializes the members or base classes of a
1685/// class (C++ [class.base.init]). For example, the three initializers
1686/// after the ':' in the Derived constructor below:
1687///
1688/// @code
1689/// class Base { };
1690/// class Derived : Base {
1691///   int x;
1692///   float f;
1693/// public:
1694///   Derived(float f) : Base(), x(17), f(f) { }
1695/// };
1696/// @endcode
1697///
1698/// [C++]  ctor-initializer:
1699///          ':' mem-initializer-list
1700///
1701/// [C++]  mem-initializer-list:
1702///          mem-initializer
1703///          mem-initializer , mem-initializer-list
1704void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1705  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1706
1707  SourceLocation ColonLoc = ConsumeToken();
1708
1709  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1710  bool AnyErrors = false;
1711
1712  do {
1713    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1714    if (!MemInit.isInvalid())
1715      MemInitializers.push_back(MemInit.get());
1716    else
1717      AnyErrors = true;
1718
1719    if (Tok.is(tok::comma))
1720      ConsumeToken();
1721    else if (Tok.is(tok::l_brace))
1722      break;
1723    else {
1724      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1725      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1726      SkipUntil(tok::l_brace, true, true);
1727      break;
1728    }
1729  } while (true);
1730
1731  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1732                               MemInitializers.data(), MemInitializers.size(),
1733                               AnyErrors);
1734}
1735
1736/// ParseMemInitializer - Parse a C++ member initializer, which is
1737/// part of a constructor initializer that explicitly initializes one
1738/// member or base class (C++ [class.base.init]). See
1739/// ParseConstructorInitializer for an example.
1740///
1741/// [C++] mem-initializer:
1742///         mem-initializer-id '(' expression-list[opt] ')'
1743///
1744/// [C++] mem-initializer-id:
1745///         '::'[opt] nested-name-specifier[opt] class-name
1746///         identifier
1747Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1748  // parse '::'[opt] nested-name-specifier[opt]
1749  CXXScopeSpec SS;
1750  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1751  TypeTy *TemplateTypeTy = 0;
1752  if (Tok.is(tok::annot_template_id)) {
1753    TemplateIdAnnotation *TemplateId
1754      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1755    if (TemplateId->Kind == TNK_Type_template ||
1756        TemplateId->Kind == TNK_Dependent_template_name) {
1757      AnnotateTemplateIdTokenAsType(&SS);
1758      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1759      TemplateTypeTy = Tok.getAnnotationValue();
1760    }
1761  }
1762  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1763    Diag(Tok, diag::err_expected_member_or_base_name);
1764    return true;
1765  }
1766
1767  // Get the identifier. This may be a member name or a class name,
1768  // but we'll let the semantic analysis determine which it is.
1769  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1770  SourceLocation IdLoc = ConsumeToken();
1771
1772  // Parse the '('.
1773  if (Tok.isNot(tok::l_paren)) {
1774    Diag(Tok, diag::err_expected_lparen);
1775    return true;
1776  }
1777  SourceLocation LParenLoc = ConsumeParen();
1778
1779  // Parse the optional expression-list.
1780  ExprVector ArgExprs(Actions);
1781  CommaLocsTy CommaLocs;
1782  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1783    SkipUntil(tok::r_paren);
1784    return true;
1785  }
1786
1787  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1788
1789  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
1790                                     TemplateTypeTy, IdLoc,
1791                                     LParenLoc, ArgExprs.take(),
1792                                     ArgExprs.size(), CommaLocs.data(),
1793                                     RParenLoc);
1794}
1795
1796/// ParseExceptionSpecification - Parse a C++ exception-specification
1797/// (C++ [except.spec]).
1798///
1799///       exception-specification:
1800///         'throw' '(' type-id-list [opt] ')'
1801/// [MS]    'throw' '(' '...' ')'
1802///
1803///       type-id-list:
1804///         type-id
1805///         type-id-list ',' type-id
1806///
1807bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1808                                         llvm::SmallVector<TypeTy*, 2>
1809                                             &Exceptions,
1810                                         llvm::SmallVector<SourceRange, 2>
1811                                             &Ranges,
1812                                         bool &hasAnyExceptionSpec) {
1813  assert(Tok.is(tok::kw_throw) && "expected throw");
1814
1815  SourceLocation ThrowLoc = ConsumeToken();
1816
1817  if (!Tok.is(tok::l_paren)) {
1818    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1819  }
1820  SourceLocation LParenLoc = ConsumeParen();
1821
1822  // Parse throw(...), a Microsoft extension that means "this function
1823  // can throw anything".
1824  if (Tok.is(tok::ellipsis)) {
1825    hasAnyExceptionSpec = true;
1826    SourceLocation EllipsisLoc = ConsumeToken();
1827    if (!getLang().Microsoft)
1828      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1829    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1830    return false;
1831  }
1832
1833  // Parse the sequence of type-ids.
1834  SourceRange Range;
1835  while (Tok.isNot(tok::r_paren)) {
1836    TypeResult Res(ParseTypeName(&Range));
1837    if (!Res.isInvalid()) {
1838      Exceptions.push_back(Res.get());
1839      Ranges.push_back(Range);
1840    }
1841    if (Tok.is(tok::comma))
1842      ConsumeToken();
1843    else
1844      break;
1845  }
1846
1847  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1848  return false;
1849}
1850
1851/// \brief We have just started parsing the definition of a new class,
1852/// so push that class onto our stack of classes that is currently
1853/// being parsed.
1854void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) {
1855  assert((NonNestedClass || !ClassStack.empty()) &&
1856         "Nested class without outer class");
1857  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
1858}
1859
1860/// \brief Deallocate the given parsed class and all of its nested
1861/// classes.
1862void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1863  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1864    DeallocateParsedClasses(Class->NestedClasses[I]);
1865  delete Class;
1866}
1867
1868/// \brief Pop the top class of the stack of classes that are
1869/// currently being parsed.
1870///
1871/// This routine should be called when we have finished parsing the
1872/// definition of a class, but have not yet popped the Scope
1873/// associated with the class's definition.
1874///
1875/// \returns true if the class we've popped is a top-level class,
1876/// false otherwise.
1877void Parser::PopParsingClass() {
1878  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1879
1880  ParsingClass *Victim = ClassStack.top();
1881  ClassStack.pop();
1882  if (Victim->TopLevelClass) {
1883    // Deallocate all of the nested classes of this class,
1884    // recursively: we don't need to keep any of this information.
1885    DeallocateParsedClasses(Victim);
1886    return;
1887  }
1888  assert(!ClassStack.empty() && "Missing top-level class?");
1889
1890  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1891      Victim->NestedClasses.empty()) {
1892    // The victim is a nested class, but we will not need to perform
1893    // any processing after the definition of this class since it has
1894    // no members whose handling was delayed. Therefore, we can just
1895    // remove this nested class.
1896    delete Victim;
1897    return;
1898  }
1899
1900  // This nested class has some members that will need to be processed
1901  // after the top-level class is completely defined. Therefore, add
1902  // it to the list of nested classes within its parent.
1903  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
1904  ClassStack.top()->NestedClasses.push_back(Victim);
1905  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
1906}
1907
1908/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1909/// parses standard attributes.
1910///
1911/// [C++0x] attribute-specifier:
1912///         '[' '[' attribute-list ']' ']'
1913///
1914/// [C++0x] attribute-list:
1915///         attribute[opt]
1916///         attribute-list ',' attribute[opt]
1917///
1918/// [C++0x] attribute:
1919///         attribute-token attribute-argument-clause[opt]
1920///
1921/// [C++0x] attribute-token:
1922///         identifier
1923///         attribute-scoped-token
1924///
1925/// [C++0x] attribute-scoped-token:
1926///         attribute-namespace '::' identifier
1927///
1928/// [C++0x] attribute-namespace:
1929///         identifier
1930///
1931/// [C++0x] attribute-argument-clause:
1932///         '(' balanced-token-seq ')'
1933///
1934/// [C++0x] balanced-token-seq:
1935///         balanced-token
1936///         balanced-token-seq balanced-token
1937///
1938/// [C++0x] balanced-token:
1939///         '(' balanced-token-seq ')'
1940///         '[' balanced-token-seq ']'
1941///         '{' balanced-token-seq '}'
1942///         any token but '(', ')', '[', ']', '{', or '}'
1943CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1944  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1945      && "Not a C++0x attribute list");
1946
1947  SourceLocation StartLoc = Tok.getLocation(), Loc;
1948  AttributeList *CurrAttr = 0;
1949
1950  ConsumeBracket();
1951  ConsumeBracket();
1952
1953  if (Tok.is(tok::comma)) {
1954    Diag(Tok.getLocation(), diag::err_expected_ident);
1955    ConsumeToken();
1956  }
1957
1958  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1959    // attribute not present
1960    if (Tok.is(tok::comma)) {
1961      ConsumeToken();
1962      continue;
1963    }
1964
1965    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1966    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1967
1968    // scoped attribute
1969    if (Tok.is(tok::coloncolon)) {
1970      ConsumeToken();
1971
1972      if (!Tok.is(tok::identifier)) {
1973        Diag(Tok.getLocation(), diag::err_expected_ident);
1974        SkipUntil(tok::r_square, tok::comma, true, true);
1975        continue;
1976      }
1977
1978      ScopeName = AttrName;
1979      ScopeLoc = AttrLoc;
1980
1981      AttrName = Tok.getIdentifierInfo();
1982      AttrLoc = ConsumeToken();
1983    }
1984
1985    bool AttrParsed = false;
1986    // No scoped names are supported; ideally we could put all non-standard
1987    // attributes into namespaces.
1988    if (!ScopeName) {
1989      switch(AttributeList::getKind(AttrName))
1990      {
1991      // No arguments
1992      case AttributeList::AT_base_check:
1993      case AttributeList::AT_carries_dependency:
1994      case AttributeList::AT_final:
1995      case AttributeList::AT_hiding:
1996      case AttributeList::AT_noreturn:
1997      case AttributeList::AT_override: {
1998        if (Tok.is(tok::l_paren)) {
1999          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
2000            << AttrName->getName();
2001          break;
2002        }
2003
2004        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
2005                                     SourceLocation(), 0, 0, CurrAttr, false,
2006                                     true);
2007        AttrParsed = true;
2008        break;
2009      }
2010
2011      // One argument; must be a type-id or assignment-expression
2012      case AttributeList::AT_aligned: {
2013        if (Tok.isNot(tok::l_paren)) {
2014          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
2015            << AttrName->getName();
2016          break;
2017        }
2018        SourceLocation ParamLoc = ConsumeParen();
2019
2020        OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
2021
2022        MatchRHSPunctuation(tok::r_paren, ParamLoc);
2023
2024        ExprVector ArgExprs(Actions);
2025        ArgExprs.push_back(ArgExpr.release());
2026        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
2027                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
2028                                     false, true);
2029
2030        AttrParsed = true;
2031        break;
2032      }
2033
2034      // Silence warnings
2035      default: break;
2036      }
2037    }
2038
2039    // Skip the entire parameter clause, if any
2040    if (!AttrParsed && Tok.is(tok::l_paren)) {
2041      ConsumeParen();
2042      // SkipUntil maintains the balancedness of tokens.
2043      SkipUntil(tok::r_paren, false);
2044    }
2045  }
2046
2047  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2048    SkipUntil(tok::r_square, false);
2049  Loc = Tok.getLocation();
2050  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2051    SkipUntil(tok::r_square, false);
2052
2053  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
2054  return Attr;
2055}
2056
2057/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
2058/// attribute.
2059///
2060/// FIXME: Simply returns an alignof() expression if the argument is a
2061/// type. Ideally, the type should be propagated directly into Sema.
2062///
2063/// [C++0x] 'align' '(' type-id ')'
2064/// [C++0x] 'align' '(' assignment-expression ')'
2065Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2066  if (isTypeIdInParens()) {
2067    EnterExpressionEvaluationContext Unevaluated(Actions,
2068                                                  Action::Unevaluated);
2069    SourceLocation TypeLoc = Tok.getLocation();
2070    TypeTy *Ty = ParseTypeName().get();
2071    SourceRange TypeRange(Start, Tok.getLocation());
2072    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty, TypeRange);
2073  } else
2074    return ParseConstantExpression();
2075}
2076