ParseDeclCXX.cpp revision b1f6fa48960eae269a3931d1fc545ed468d9a4d2 
1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements the C++ Declaration portions of the Parser interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/OperatorKinds.h"
15#include "clang/Parse/Parser.h"
16#include "clang/Parse/ParseDiagnostic.h"
17#include "clang/Sema/DeclSpec.h"
18#include "clang/Sema/Scope.h"
19#include "clang/Sema/ParsedTemplate.h"
20#include "clang/Sema/PrettyDeclStackTrace.h"
21#include "RAIIObjectsForParser.h"
22using namespace clang;
23
24/// ParseNamespace - We know that the current token is a namespace keyword. This
25/// may either be a top level namespace or a block-level namespace alias. If
26/// there was an inline keyword, it has already been parsed.
27///
28///       namespace-definition: [C++ 7.3: basic.namespace]
29///         named-namespace-definition
30///         unnamed-namespace-definition
31///
32///       unnamed-namespace-definition:
33///         'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
34///
35///       named-namespace-definition:
36///         original-namespace-definition
37///         extension-namespace-definition
38///
39///       original-namespace-definition:
40///         'inline'[opt] 'namespace' identifier attributes[opt]
41///             '{' namespace-body '}'
42///
43///       extension-namespace-definition:
44///         'inline'[opt] 'namespace' original-namespace-name
45///             '{' namespace-body '}'
46///
47///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
48///         'namespace' identifier '=' qualified-namespace-specifier ';'
49///
50Decl *Parser::ParseNamespace(unsigned Context,
51                             SourceLocation &DeclEnd,
52                             SourceLocation InlineLoc) {
53  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
54  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
55
56  if (Tok.is(tok::code_completion)) {
57    Actions.CodeCompleteNamespaceDecl(getCurScope());
58    ConsumeCodeCompletionToken();
59  }
60
61  SourceLocation IdentLoc;
62  IdentifierInfo *Ident = 0;
63
64  Token attrTok;
65
66  if (Tok.is(tok::identifier)) {
67    Ident = Tok.getIdentifierInfo();
68    IdentLoc = ConsumeToken();  // eat the identifier.
69  }
70
71  // Read label attributes, if present.
72  llvm::OwningPtr<AttributeList> AttrList;
73  if (Tok.is(tok::kw___attribute)) {
74    attrTok = Tok;
75
76    // FIXME: save these somewhere.
77    AttrList.reset(ParseGNUAttributes());
78  }
79
80  if (Tok.is(tok::equal)) {
81    if (AttrList)
82      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
83    if (InlineLoc.isValid())
84      Diag(InlineLoc, diag::err_inline_namespace_alias)
85          << FixItHint::CreateRemoval(InlineLoc);
86
87    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
88  }
89
90  if (Tok.isNot(tok::l_brace)) {
91    Diag(Tok, Ident ? diag::err_expected_lbrace :
92         diag::err_expected_ident_lbrace);
93    return 0;
94  }
95
96  SourceLocation LBrace = ConsumeBrace();
97
98  if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
99      getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
100      getCurScope()->getFnParent()) {
101    Diag(LBrace, diag::err_namespace_nonnamespace_scope);
102    SkipUntil(tok::r_brace, false);
103    return 0;
104  }
105
106  // If we're still good, complain about inline namespaces in non-C++0x now.
107  if (!getLang().CPlusPlus0x && InlineLoc.isValid())
108    Diag(InlineLoc, diag::ext_inline_namespace);
109
110  // Enter a scope for the namespace.
111  ParseScope NamespaceScope(this, Scope::DeclScope);
112
113  Decl *NamespcDecl =
114    Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, IdentLoc, Ident,
115                                   LBrace, AttrList.get());
116
117  PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
118                                      "parsing namespace");
119
120  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
121    CXX0XAttributeList Attr;
122    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
123      Attr = ParseCXX0XAttributes();
124    ParseExternalDeclaration(Attr);
125  }
126
127  // Leave the namespace scope.
128  NamespaceScope.Exit();
129
130  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
131  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
132
133  DeclEnd = RBraceLoc;
134  return NamespcDecl;
135}
136
137/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
138/// alias definition.
139///
140Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
141                                              SourceLocation AliasLoc,
142                                              IdentifierInfo *Alias,
143                                              SourceLocation &DeclEnd) {
144  assert(Tok.is(tok::equal) && "Not equal token");
145
146  ConsumeToken(); // eat the '='.
147
148  if (Tok.is(tok::code_completion)) {
149    Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
150    ConsumeCodeCompletionToken();
151  }
152
153  CXXScopeSpec SS;
154  // Parse (optional) nested-name-specifier.
155  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
156
157  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
158    Diag(Tok, diag::err_expected_namespace_name);
159    // Skip to end of the definition and eat the ';'.
160    SkipUntil(tok::semi);
161    return 0;
162  }
163
164  // Parse identifier.
165  IdentifierInfo *Ident = Tok.getIdentifierInfo();
166  SourceLocation IdentLoc = ConsumeToken();
167
168  // Eat the ';'.
169  DeclEnd = Tok.getLocation();
170  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
171                   "", tok::semi);
172
173  return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
174                                        SS, IdentLoc, Ident);
175}
176
177/// ParseLinkage - We know that the current token is a string_literal
178/// and just before that, that extern was seen.
179///
180///       linkage-specification: [C++ 7.5p2: dcl.link]
181///         'extern' string-literal '{' declaration-seq[opt] '}'
182///         'extern' string-literal declaration
183///
184Decl *Parser::ParseLinkage(ParsingDeclSpec &DS,
185                                       unsigned Context) {
186  assert(Tok.is(tok::string_literal) && "Not a string literal!");
187  llvm::SmallString<8> LangBuffer;
188  // LangBuffer is guaranteed to be big enough.
189  bool Invalid = false;
190  llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
191  if (Invalid)
192    return 0;
193
194  SourceLocation Loc = ConsumeStringToken();
195
196  ParseScope LinkageScope(this, Scope::DeclScope);
197  Decl *LinkageSpec
198    = Actions.ActOnStartLinkageSpecification(getCurScope(),
199                                             /*FIXME: */SourceLocation(),
200                                             Loc, Lang,
201                                       Tok.is(tok::l_brace)? Tok.getLocation()
202                                                           : SourceLocation());
203
204  CXX0XAttributeList Attr;
205  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
206    Attr = ParseCXX0XAttributes();
207  }
208
209  if (Tok.isNot(tok::l_brace)) {
210    DS.setExternInLinkageSpec(true);
211    ParseExternalDeclaration(Attr, &DS);
212    return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
213                                                   SourceLocation());
214  }
215
216  DS.abort();
217
218  if (Attr.HasAttr)
219    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
220      << Attr.Range;
221
222  SourceLocation LBrace = ConsumeBrace();
223  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
224    CXX0XAttributeList Attr;
225    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
226      Attr = ParseCXX0XAttributes();
227    ParseExternalDeclaration(Attr);
228  }
229
230  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
231  return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, RBrace);
232}
233
234/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
235/// using-directive. Assumes that current token is 'using'.
236Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
237                                                     SourceLocation &DeclEnd,
238                                                     CXX0XAttributeList Attr) {
239  assert(Tok.is(tok::kw_using) && "Not using token");
240
241  // Eat 'using'.
242  SourceLocation UsingLoc = ConsumeToken();
243
244  if (Tok.is(tok::code_completion)) {
245    Actions.CodeCompleteUsing(getCurScope());
246    ConsumeCodeCompletionToken();
247  }
248
249  if (Tok.is(tok::kw_namespace))
250    // Next token after 'using' is 'namespace' so it must be using-directive
251    return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
252
253  if (Attr.HasAttr)
254    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
255      << Attr.Range;
256
257  // Otherwise, it must be using-declaration.
258  // Ignore illegal attributes (the caller should already have issued an error.
259  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
260}
261
262/// ParseUsingDirective - Parse C++ using-directive, assumes
263/// that current token is 'namespace' and 'using' was already parsed.
264///
265///       using-directive: [C++ 7.3.p4: namespace.udir]
266///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
267///                 namespace-name ;
268/// [GNU] using-directive:
269///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
270///                 namespace-name attributes[opt] ;
271///
272Decl *Parser::ParseUsingDirective(unsigned Context,
273                                              SourceLocation UsingLoc,
274                                              SourceLocation &DeclEnd,
275                                              AttributeList *Attr) {
276  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
277
278  // Eat 'namespace'.
279  SourceLocation NamespcLoc = ConsumeToken();
280
281  if (Tok.is(tok::code_completion)) {
282    Actions.CodeCompleteUsingDirective(getCurScope());
283    ConsumeCodeCompletionToken();
284  }
285
286  CXXScopeSpec SS;
287  // Parse (optional) nested-name-specifier.
288  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
289
290  IdentifierInfo *NamespcName = 0;
291  SourceLocation IdentLoc = SourceLocation();
292
293  // Parse namespace-name.
294  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
295    Diag(Tok, diag::err_expected_namespace_name);
296    // If there was invalid namespace name, skip to end of decl, and eat ';'.
297    SkipUntil(tok::semi);
298    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
299    return 0;
300  }
301
302  // Parse identifier.
303  NamespcName = Tok.getIdentifierInfo();
304  IdentLoc = ConsumeToken();
305
306  // Parse (optional) attributes (most likely GNU strong-using extension).
307  bool GNUAttr = false;
308  if (Tok.is(tok::kw___attribute)) {
309    GNUAttr = true;
310    Attr = addAttributeLists(Attr, ParseGNUAttributes());
311  }
312
313  // Eat ';'.
314  DeclEnd = Tok.getLocation();
315  ExpectAndConsume(tok::semi,
316                   GNUAttr ? diag::err_expected_semi_after_attribute_list :
317                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
318
319  return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
320                                      IdentLoc, NamespcName, Attr);
321}
322
323/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
324/// 'using' was already seen.
325///
326///     using-declaration: [C++ 7.3.p3: namespace.udecl]
327///       'using' 'typename'[opt] ::[opt] nested-name-specifier
328///               unqualified-id
329///       'using' :: unqualified-id
330///
331Decl *Parser::ParseUsingDeclaration(unsigned Context,
332                                                SourceLocation UsingLoc,
333                                                SourceLocation &DeclEnd,
334                                                AccessSpecifier AS) {
335  CXXScopeSpec SS;
336  SourceLocation TypenameLoc;
337  bool IsTypeName;
338
339  // Ignore optional 'typename'.
340  // FIXME: This is wrong; we should parse this as a typename-specifier.
341  if (Tok.is(tok::kw_typename)) {
342    TypenameLoc = Tok.getLocation();
343    ConsumeToken();
344    IsTypeName = true;
345  }
346  else
347    IsTypeName = false;
348
349  // Parse nested-name-specifier.
350  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
351
352  // Check nested-name specifier.
353  if (SS.isInvalid()) {
354    SkipUntil(tok::semi);
355    return 0;
356  }
357
358  // Parse the unqualified-id. We allow parsing of both constructor and
359  // destructor names and allow the action module to diagnose any semantic
360  // errors.
361  UnqualifiedId Name;
362  if (ParseUnqualifiedId(SS,
363                         /*EnteringContext=*/false,
364                         /*AllowDestructorName=*/true,
365                         /*AllowConstructorName=*/true,
366                         ParsedType(),
367                         Name)) {
368    SkipUntil(tok::semi);
369    return 0;
370  }
371
372  // Parse (optional) attributes (most likely GNU strong-using extension).
373  llvm::OwningPtr<AttributeList> AttrList;
374  if (Tok.is(tok::kw___attribute))
375    AttrList.reset(ParseGNUAttributes());
376
377  // Eat ';'.
378  DeclEnd = Tok.getLocation();
379  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
380                   AttrList ? "attributes list" : "using declaration",
381                   tok::semi);
382
383  return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, Name,
384                                       AttrList.get(), IsTypeName, TypenameLoc);
385}
386
387/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
388///
389///      static_assert-declaration:
390///        static_assert ( constant-expression  ,  string-literal  ) ;
391///
392Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
393  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
394  SourceLocation StaticAssertLoc = ConsumeToken();
395
396  if (Tok.isNot(tok::l_paren)) {
397    Diag(Tok, diag::err_expected_lparen);
398    return 0;
399  }
400
401  SourceLocation LParenLoc = ConsumeParen();
402
403  ExprResult AssertExpr(ParseConstantExpression());
404  if (AssertExpr.isInvalid()) {
405    SkipUntil(tok::semi);
406    return 0;
407  }
408
409  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
410    return 0;
411
412  if (Tok.isNot(tok::string_literal)) {
413    Diag(Tok, diag::err_expected_string_literal);
414    SkipUntil(tok::semi);
415    return 0;
416  }
417
418  ExprResult AssertMessage(ParseStringLiteralExpression());
419  if (AssertMessage.isInvalid())
420    return 0;
421
422  MatchRHSPunctuation(tok::r_paren, LParenLoc);
423
424  DeclEnd = Tok.getLocation();
425  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
426
427  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
428                                              AssertExpr.take(),
429                                              AssertMessage.take());
430}
431
432/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
433///
434/// 'decltype' ( expression )
435///
436void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
437  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
438
439  SourceLocation StartLoc = ConsumeToken();
440  SourceLocation LParenLoc = Tok.getLocation();
441
442  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
443                       "decltype")) {
444    SkipUntil(tok::r_paren);
445    return;
446  }
447
448  // Parse the expression
449
450  // C++0x [dcl.type.simple]p4:
451  //   The operand of the decltype specifier is an unevaluated operand.
452  EnterExpressionEvaluationContext Unevaluated(Actions,
453                                               Sema::Unevaluated);
454  ExprResult Result = ParseExpression();
455  if (Result.isInvalid()) {
456    SkipUntil(tok::r_paren);
457    return;
458  }
459
460  // Match the ')'
461  SourceLocation RParenLoc;
462  if (Tok.is(tok::r_paren))
463    RParenLoc = ConsumeParen();
464  else
465    MatchRHSPunctuation(tok::r_paren, LParenLoc);
466
467  if (RParenLoc.isInvalid())
468    return;
469
470  const char *PrevSpec = 0;
471  unsigned DiagID;
472  // Check for duplicate type specifiers (e.g. "int decltype(a)").
473  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
474                         DiagID, Result.release()))
475    Diag(StartLoc, DiagID) << PrevSpec;
476}
477
478/// ParseClassName - Parse a C++ class-name, which names a class. Note
479/// that we only check that the result names a type; semantic analysis
480/// will need to verify that the type names a class. The result is
481/// either a type or NULL, depending on whether a type name was
482/// found.
483///
484///       class-name: [C++ 9.1]
485///         identifier
486///         simple-template-id
487///
488Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
489                                          CXXScopeSpec *SS) {
490  // Check whether we have a template-id that names a type.
491  if (Tok.is(tok::annot_template_id)) {
492    TemplateIdAnnotation *TemplateId
493      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
494    if (TemplateId->Kind == TNK_Type_template ||
495        TemplateId->Kind == TNK_Dependent_template_name) {
496      AnnotateTemplateIdTokenAsType(SS);
497
498      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
499      ParsedType Type = getTypeAnnotation(Tok);
500      EndLocation = Tok.getAnnotationEndLoc();
501      ConsumeToken();
502
503      if (Type)
504        return Type;
505      return true;
506    }
507
508    // Fall through to produce an error below.
509  }
510
511  if (Tok.isNot(tok::identifier)) {
512    Diag(Tok, diag::err_expected_class_name);
513    return true;
514  }
515
516  IdentifierInfo *Id = Tok.getIdentifierInfo();
517  SourceLocation IdLoc = ConsumeToken();
518
519  if (Tok.is(tok::less)) {
520    // It looks the user intended to write a template-id here, but the
521    // template-name was wrong. Try to fix that.
522    TemplateNameKind TNK = TNK_Type_template;
523    TemplateTy Template;
524    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
525                                             SS, Template, TNK)) {
526      Diag(IdLoc, diag::err_unknown_template_name)
527        << Id;
528    }
529
530    if (!Template)
531      return true;
532
533    // Form the template name
534    UnqualifiedId TemplateName;
535    TemplateName.setIdentifier(Id, IdLoc);
536
537    // Parse the full template-id, then turn it into a type.
538    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
539                                SourceLocation(), true))
540      return true;
541    if (TNK == TNK_Dependent_template_name)
542      AnnotateTemplateIdTokenAsType(SS);
543
544    // If we didn't end up with a typename token, there's nothing more we
545    // can do.
546    if (Tok.isNot(tok::annot_typename))
547      return true;
548
549    // Retrieve the type from the annotation token, consume that token, and
550    // return.
551    EndLocation = Tok.getAnnotationEndLoc();
552    ParsedType Type = getTypeAnnotation(Tok);
553    ConsumeToken();
554    return Type;
555  }
556
557  // We have an identifier; check whether it is actually a type.
558  ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), SS, true);
559  if (!Type) {
560    Diag(IdLoc, diag::err_expected_class_name);
561    return true;
562  }
563
564  // Consume the identifier.
565  EndLocation = IdLoc;
566
567  // Fake up a Declarator to use with ActOnTypeName.
568  DeclSpec DS;
569  DS.SetRangeStart(IdLoc);
570  DS.SetRangeEnd(EndLocation);
571  DS.getTypeSpecScope() = *SS;
572
573  const char *PrevSpec = 0;
574  unsigned DiagID;
575  DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
576
577  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
578  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
579}
580
581/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
582/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
583/// until we reach the start of a definition or see a token that
584/// cannot start a definition. If SuppressDeclarations is true, we do know.
585///
586///       class-specifier: [C++ class]
587///         class-head '{' member-specification[opt] '}'
588///         class-head '{' member-specification[opt] '}' attributes[opt]
589///       class-head:
590///         class-key identifier[opt] base-clause[opt]
591///         class-key nested-name-specifier identifier base-clause[opt]
592///         class-key nested-name-specifier[opt] simple-template-id
593///                          base-clause[opt]
594/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
595/// [GNU]   class-key attributes[opt] nested-name-specifier
596///                          identifier base-clause[opt]
597/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
598///                          simple-template-id base-clause[opt]
599///       class-key:
600///         'class'
601///         'struct'
602///         'union'
603///
604///       elaborated-type-specifier: [C++ dcl.type.elab]
605///         class-key ::[opt] nested-name-specifier[opt] identifier
606///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
607///                          simple-template-id
608///
609///  Note that the C++ class-specifier and elaborated-type-specifier,
610///  together, subsume the C99 struct-or-union-specifier:
611///
612///       struct-or-union-specifier: [C99 6.7.2.1]
613///         struct-or-union identifier[opt] '{' struct-contents '}'
614///         struct-or-union identifier
615/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
616///                                                         '}' attributes[opt]
617/// [GNU]   struct-or-union attributes[opt] identifier
618///       struct-or-union:
619///         'struct'
620///         'union'
621void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
622                                 SourceLocation StartLoc, DeclSpec &DS,
623                                 const ParsedTemplateInfo &TemplateInfo,
624                                 AccessSpecifier AS, bool SuppressDeclarations){
625  DeclSpec::TST TagType;
626  if (TagTokKind == tok::kw_struct)
627    TagType = DeclSpec::TST_struct;
628  else if (TagTokKind == tok::kw_class)
629    TagType = DeclSpec::TST_class;
630  else {
631    assert(TagTokKind == tok::kw_union && "Not a class specifier");
632    TagType = DeclSpec::TST_union;
633  }
634
635  if (Tok.is(tok::code_completion)) {
636    // Code completion for a struct, class, or union name.
637    Actions.CodeCompleteTag(getCurScope(), TagType);
638    ConsumeCodeCompletionToken();
639  }
640
641  // C++03 [temp.explicit] 14.7.2/8:
642  //   The usual access checking rules do not apply to names used to specify
643  //   explicit instantiations.
644  //
645  // As an extension we do not perform access checking on the names used to
646  // specify explicit specializations either. This is important to allow
647  // specializing traits classes for private types.
648  bool SuppressingAccessChecks = false;
649  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
650      TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) {
651    Actions.ActOnStartSuppressingAccessChecks();
652    SuppressingAccessChecks = true;
653  }
654
655  AttributeList *AttrList = 0;
656  // If attributes exist after tag, parse them.
657  if (Tok.is(tok::kw___attribute))
658    AttrList = ParseGNUAttributes();
659
660  // If declspecs exist after tag, parse them.
661  while (Tok.is(tok::kw___declspec))
662    AttrList = ParseMicrosoftDeclSpec(AttrList);
663
664  // If C++0x attributes exist here, parse them.
665  // FIXME: Are we consistent with the ordering of parsing of different
666  // styles of attributes?
667  if (isCXX0XAttributeSpecifier())
668    AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
669
670  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
671    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
672    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
673    // token sequence "struct __is_pod", make __is_pod into a normal
674    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
675    // properly.
676    Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
677    Tok.setKind(tok::identifier);
678  }
679
680  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
681    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
682    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
683    // token sequence "struct __is_empty", make __is_empty into a normal
684    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
685    // properly.
686    Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
687    Tok.setKind(tok::identifier);
688  }
689
690  // Parse the (optional) nested-name-specifier.
691  CXXScopeSpec &SS = DS.getTypeSpecScope();
692  if (getLang().CPlusPlus) {
693    // "FOO : BAR" is not a potential typo for "FOO::BAR".
694    ColonProtectionRAIIObject X(*this);
695
696    if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true))
697      DS.SetTypeSpecError();
698    if (SS.isSet())
699      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
700        Diag(Tok, diag::err_expected_ident);
701  }
702
703  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
704
705  // Parse the (optional) class name or simple-template-id.
706  IdentifierInfo *Name = 0;
707  SourceLocation NameLoc;
708  TemplateIdAnnotation *TemplateId = 0;
709  if (Tok.is(tok::identifier)) {
710    Name = Tok.getIdentifierInfo();
711    NameLoc = ConsumeToken();
712
713    if (Tok.is(tok::less) && getLang().CPlusPlus) {
714      // The name was supposed to refer to a template, but didn't.
715      // Eat the template argument list and try to continue parsing this as
716      // a class (or template thereof).
717      TemplateArgList TemplateArgs;
718      SourceLocation LAngleLoc, RAngleLoc;
719      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
720                                           true, LAngleLoc,
721                                           TemplateArgs, RAngleLoc)) {
722        // We couldn't parse the template argument list at all, so don't
723        // try to give any location information for the list.
724        LAngleLoc = RAngleLoc = SourceLocation();
725      }
726
727      Diag(NameLoc, diag::err_explicit_spec_non_template)
728        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
729        << (TagType == DeclSpec::TST_class? 0
730            : TagType == DeclSpec::TST_struct? 1
731            : 2)
732        << Name
733        << SourceRange(LAngleLoc, RAngleLoc);
734
735      // Strip off the last template parameter list if it was empty, since
736      // we've removed its template argument list.
737      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
738        if (TemplateParams && TemplateParams->size() > 1) {
739          TemplateParams->pop_back();
740        } else {
741          TemplateParams = 0;
742          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
743            = ParsedTemplateInfo::NonTemplate;
744        }
745      } else if (TemplateInfo.Kind
746                                == ParsedTemplateInfo::ExplicitInstantiation) {
747        // Pretend this is just a forward declaration.
748        TemplateParams = 0;
749        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
750          = ParsedTemplateInfo::NonTemplate;
751        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
752          = SourceLocation();
753        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
754          = SourceLocation();
755      }
756    }
757  } else if (Tok.is(tok::annot_template_id)) {
758    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
759    NameLoc = ConsumeToken();
760
761    if (TemplateId->Kind != TNK_Type_template) {
762      // The template-name in the simple-template-id refers to
763      // something other than a class template. Give an appropriate
764      // error message and skip to the ';'.
765      SourceRange Range(NameLoc);
766      if (SS.isNotEmpty())
767        Range.setBegin(SS.getBeginLoc());
768
769      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
770        << Name << static_cast<int>(TemplateId->Kind) << Range;
771
772      DS.SetTypeSpecError();
773      SkipUntil(tok::semi, false, true);
774      TemplateId->Destroy();
775      if (SuppressingAccessChecks)
776        Actions.ActOnStopSuppressingAccessChecks();
777
778      return;
779    }
780  }
781
782  // As soon as we're finished parsing the class's template-id, turn access
783  // checking back on.
784  if (SuppressingAccessChecks)
785    Actions.ActOnStopSuppressingAccessChecks();
786
787  // There are four options here.  If we have 'struct foo;', then this
788  // is either a forward declaration or a friend declaration, which
789  // have to be treated differently.  If we have 'struct foo {...' or
790  // 'struct foo :...' then this is a definition. Otherwise we have
791  // something like 'struct foo xyz', a reference.
792  // However, in some contexts, things look like declarations but are just
793  // references, e.g.
794  // new struct s;
795  // or
796  // &T::operator struct s;
797  // For these, SuppressDeclarations is true.
798  Sema::TagUseKind TUK;
799  if (SuppressDeclarations)
800    TUK = Sema::TUK_Reference;
801  else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
802    if (DS.isFriendSpecified()) {
803      // C++ [class.friend]p2:
804      //   A class shall not be defined in a friend declaration.
805      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
806        << SourceRange(DS.getFriendSpecLoc());
807
808      // Skip everything up to the semicolon, so that this looks like a proper
809      // friend class (or template thereof) declaration.
810      SkipUntil(tok::semi, true, true);
811      TUK = Sema::TUK_Friend;
812    } else {
813      // Okay, this is a class definition.
814      TUK = Sema::TUK_Definition;
815    }
816  } else if (Tok.is(tok::semi))
817    TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
818  else
819    TUK = Sema::TUK_Reference;
820
821  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
822                               TUK != Sema::TUK_Definition)) {
823    if (DS.getTypeSpecType() != DeclSpec::TST_error) {
824      // We have a declaration or reference to an anonymous class.
825      Diag(StartLoc, diag::err_anon_type_definition)
826        << DeclSpec::getSpecifierName(TagType);
827    }
828
829    SkipUntil(tok::comma, true);
830
831    if (TemplateId)
832      TemplateId->Destroy();
833    return;
834  }
835
836  // Create the tag portion of the class or class template.
837  DeclResult TagOrTempResult = true; // invalid
838  TypeResult TypeResult = true; // invalid
839
840  bool Owned = false;
841  if (TemplateId) {
842    // Explicit specialization, class template partial specialization,
843    // or explicit instantiation.
844    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
845                                       TemplateId->getTemplateArgs(),
846                                       TemplateId->NumArgs);
847    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
848        TUK == Sema::TUK_Declaration) {
849      // This is an explicit instantiation of a class template.
850      TagOrTempResult
851        = Actions.ActOnExplicitInstantiation(getCurScope(),
852                                             TemplateInfo.ExternLoc,
853                                             TemplateInfo.TemplateLoc,
854                                             TagType,
855                                             StartLoc,
856                                             SS,
857                                             TemplateId->Template,
858                                             TemplateId->TemplateNameLoc,
859                                             TemplateId->LAngleLoc,
860                                             TemplateArgsPtr,
861                                             TemplateId->RAngleLoc,
862                                             AttrList);
863
864    // Friend template-ids are treated as references unless
865    // they have template headers, in which case they're ill-formed
866    // (FIXME: "template <class T> friend class A<T>::B<int>;").
867    // We diagnose this error in ActOnClassTemplateSpecialization.
868    } else if (TUK == Sema::TUK_Reference ||
869               (TUK == Sema::TUK_Friend &&
870                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
871      TypeResult
872        = Actions.ActOnTemplateIdType(TemplateId->Template,
873                                      TemplateId->TemplateNameLoc,
874                                      TemplateId->LAngleLoc,
875                                      TemplateArgsPtr,
876                                      TemplateId->RAngleLoc);
877
878      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
879                                                  TagType, StartLoc);
880    } else {
881      // This is an explicit specialization or a class template
882      // partial specialization.
883      TemplateParameterLists FakedParamLists;
884
885      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
886        // This looks like an explicit instantiation, because we have
887        // something like
888        //
889        //   template class Foo<X>
890        //
891        // but it actually has a definition. Most likely, this was
892        // meant to be an explicit specialization, but the user forgot
893        // the '<>' after 'template'.
894        assert(TUK == Sema::TUK_Definition && "Expected a definition here");
895
896        SourceLocation LAngleLoc
897          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
898        Diag(TemplateId->TemplateNameLoc,
899             diag::err_explicit_instantiation_with_definition)
900          << SourceRange(TemplateInfo.TemplateLoc)
901          << FixItHint::CreateInsertion(LAngleLoc, "<>");
902
903        // Create a fake template parameter list that contains only
904        // "template<>", so that we treat this construct as a class
905        // template specialization.
906        FakedParamLists.push_back(
907          Actions.ActOnTemplateParameterList(0, SourceLocation(),
908                                             TemplateInfo.TemplateLoc,
909                                             LAngleLoc,
910                                             0, 0,
911                                             LAngleLoc));
912        TemplateParams = &FakedParamLists;
913      }
914
915      // Build the class template specialization.
916      TagOrTempResult
917        = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
918                       StartLoc, SS,
919                       TemplateId->Template,
920                       TemplateId->TemplateNameLoc,
921                       TemplateId->LAngleLoc,
922                       TemplateArgsPtr,
923                       TemplateId->RAngleLoc,
924                       AttrList,
925                       MultiTemplateParamsArg(Actions,
926                                    TemplateParams? &(*TemplateParams)[0] : 0,
927                                 TemplateParams? TemplateParams->size() : 0));
928    }
929    TemplateId->Destroy();
930  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
931             TUK == Sema::TUK_Declaration) {
932    // Explicit instantiation of a member of a class template
933    // specialization, e.g.,
934    //
935    //   template struct Outer<int>::Inner;
936    //
937    TagOrTempResult
938      = Actions.ActOnExplicitInstantiation(getCurScope(),
939                                           TemplateInfo.ExternLoc,
940                                           TemplateInfo.TemplateLoc,
941                                           TagType, StartLoc, SS, Name,
942                                           NameLoc, AttrList);
943  } else {
944    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
945        TUK == Sema::TUK_Definition) {
946      // FIXME: Diagnose this particular error.
947    }
948
949    bool IsDependent = false;
950
951    // Declaration or definition of a class type
952    TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, SS,
953                                       Name, NameLoc, AttrList, AS,
954                                       MultiTemplateParamsArg(Actions,
955                                    TemplateParams? &(*TemplateParams)[0] : 0,
956                                    TemplateParams? TemplateParams->size() : 0),
957                                       Owned, IsDependent);
958
959    // If ActOnTag said the type was dependent, try again with the
960    // less common call.
961    if (IsDependent)
962      TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
963                                             SS, Name, StartLoc, NameLoc);
964  }
965
966  // If there is a body, parse it and inform the actions module.
967  if (TUK == Sema::TUK_Definition) {
968    assert(Tok.is(tok::l_brace) ||
969           (getLang().CPlusPlus && Tok.is(tok::colon)));
970    if (getLang().CPlusPlus)
971      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
972    else
973      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
974  }
975
976  // FIXME: The DeclSpec should keep the locations of both the keyword and the
977  // name (if there is one).
978  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
979
980  const char *PrevSpec = 0;
981  unsigned DiagID;
982  bool Result;
983  if (!TypeResult.isInvalid()) {
984    Result = DS.SetTypeSpecType(DeclSpec::TST_typename, TSTLoc,
985                                PrevSpec, DiagID, TypeResult.get());
986  } else if (!TagOrTempResult.isInvalid()) {
987    Result = DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
988                                TagOrTempResult.get(), Owned);
989  } else {
990    DS.SetTypeSpecError();
991    return;
992  }
993
994  if (Result)
995    Diag(StartLoc, DiagID) << PrevSpec;
996
997  // At this point, we've successfully parsed a class-specifier in 'definition'
998  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
999  // going to look at what comes after it to improve error recovery.  If an
1000  // impossible token occurs next, we assume that the programmer forgot a ; at
1001  // the end of the declaration and recover that way.
1002  //
1003  // This switch enumerates the valid "follow" set for definition.
1004  if (TUK == Sema::TUK_Definition) {
1005    bool ExpectedSemi = true;
1006    switch (Tok.getKind()) {
1007    default: break;
1008    case tok::semi:               // struct foo {...} ;
1009    case tok::star:               // struct foo {...} *         P;
1010    case tok::amp:                // struct foo {...} &         R = ...
1011    case tok::identifier:         // struct foo {...} V         ;
1012    case tok::r_paren:            //(struct foo {...} )         {4}
1013    case tok::annot_cxxscope:     // struct foo {...} a::       b;
1014    case tok::annot_typename:     // struct foo {...} a         ::b;
1015    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
1016    case tok::l_paren:            // struct foo {...} (         x);
1017    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
1018      ExpectedSemi = false;
1019      break;
1020    // Type qualifiers
1021    case tok::kw_const:           // struct foo {...} const     x;
1022    case tok::kw_volatile:        // struct foo {...} volatile  x;
1023    case tok::kw_restrict:        // struct foo {...} restrict  x;
1024    case tok::kw_inline:          // struct foo {...} inline    foo() {};
1025    // Storage-class specifiers
1026    case tok::kw_static:          // struct foo {...} static    x;
1027    case tok::kw_extern:          // struct foo {...} extern    x;
1028    case tok::kw_typedef:         // struct foo {...} typedef   x;
1029    case tok::kw_register:        // struct foo {...} register  x;
1030    case tok::kw_auto:            // struct foo {...} auto      x;
1031    case tok::kw_mutable:         // struct foo {...} mutable      x;
1032      // As shown above, type qualifiers and storage class specifiers absolutely
1033      // can occur after class specifiers according to the grammar.  However,
1034      // almost noone actually writes code like this.  If we see one of these,
1035      // it is much more likely that someone missed a semi colon and the
1036      // type/storage class specifier we're seeing is part of the *next*
1037      // intended declaration, as in:
1038      //
1039      //   struct foo { ... }
1040      //   typedef int X;
1041      //
1042      // We'd really like to emit a missing semicolon error instead of emitting
1043      // an error on the 'int' saying that you can't have two type specifiers in
1044      // the same declaration of X.  Because of this, we look ahead past this
1045      // token to see if it's a type specifier.  If so, we know the code is
1046      // otherwise invalid, so we can produce the expected semi error.
1047      if (!isKnownToBeTypeSpecifier(NextToken()))
1048        ExpectedSemi = false;
1049      break;
1050
1051    case tok::r_brace:  // struct bar { struct foo {...} }
1052      // Missing ';' at end of struct is accepted as an extension in C mode.
1053      if (!getLang().CPlusPlus)
1054        ExpectedSemi = false;
1055      break;
1056    }
1057
1058    if (ExpectedSemi) {
1059      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1060                       TagType == DeclSpec::TST_class ? "class"
1061                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1062      // Push this token back into the preprocessor and change our current token
1063      // to ';' so that the rest of the code recovers as though there were an
1064      // ';' after the definition.
1065      PP.EnterToken(Tok);
1066      Tok.setKind(tok::semi);
1067    }
1068  }
1069}
1070
1071/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1072///
1073///       base-clause : [C++ class.derived]
1074///         ':' base-specifier-list
1075///       base-specifier-list:
1076///         base-specifier '...'[opt]
1077///         base-specifier-list ',' base-specifier '...'[opt]
1078void Parser::ParseBaseClause(Decl *ClassDecl) {
1079  assert(Tok.is(tok::colon) && "Not a base clause");
1080  ConsumeToken();
1081
1082  // Build up an array of parsed base specifiers.
1083  llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1084
1085  while (true) {
1086    // Parse a base-specifier.
1087    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1088    if (Result.isInvalid()) {
1089      // Skip the rest of this base specifier, up until the comma or
1090      // opening brace.
1091      SkipUntil(tok::comma, tok::l_brace, true, true);
1092    } else {
1093      // Add this to our array of base specifiers.
1094      BaseInfo.push_back(Result.get());
1095    }
1096
1097    // If the next token is a comma, consume it and keep reading
1098    // base-specifiers.
1099    if (Tok.isNot(tok::comma)) break;
1100
1101    // Consume the comma.
1102    ConsumeToken();
1103  }
1104
1105  // Attach the base specifiers
1106  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1107}
1108
1109/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1110/// one entry in the base class list of a class specifier, for example:
1111///    class foo : public bar, virtual private baz {
1112/// 'public bar' and 'virtual private baz' are each base-specifiers.
1113///
1114///       base-specifier: [C++ class.derived]
1115///         ::[opt] nested-name-specifier[opt] class-name
1116///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1117///                        class-name
1118///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1119///                        class-name
1120Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1121  bool IsVirtual = false;
1122  SourceLocation StartLoc = Tok.getLocation();
1123
1124  // Parse the 'virtual' keyword.
1125  if (Tok.is(tok::kw_virtual))  {
1126    ConsumeToken();
1127    IsVirtual = true;
1128  }
1129
1130  // Parse an (optional) access specifier.
1131  AccessSpecifier Access = getAccessSpecifierIfPresent();
1132  if (Access != AS_none)
1133    ConsumeToken();
1134
1135  // Parse the 'virtual' keyword (again!), in case it came after the
1136  // access specifier.
1137  if (Tok.is(tok::kw_virtual))  {
1138    SourceLocation VirtualLoc = ConsumeToken();
1139    if (IsVirtual) {
1140      // Complain about duplicate 'virtual'
1141      Diag(VirtualLoc, diag::err_dup_virtual)
1142        << FixItHint::CreateRemoval(VirtualLoc);
1143    }
1144
1145    IsVirtual = true;
1146  }
1147
1148  // Parse optional '::' and optional nested-name-specifier.
1149  CXXScopeSpec SS;
1150  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
1151
1152  // The location of the base class itself.
1153  SourceLocation BaseLoc = Tok.getLocation();
1154
1155  // Parse the class-name.
1156  SourceLocation EndLocation;
1157  TypeResult BaseType = ParseClassName(EndLocation, &SS);
1158  if (BaseType.isInvalid())
1159    return true;
1160
1161  // Find the complete source range for the base-specifier.
1162  SourceRange Range(StartLoc, EndLocation);
1163
1164  // Notify semantic analysis that we have parsed a complete
1165  // base-specifier.
1166  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1167                                    BaseType.get(), BaseLoc);
1168}
1169
1170/// getAccessSpecifierIfPresent - Determine whether the next token is
1171/// a C++ access-specifier.
1172///
1173///       access-specifier: [C++ class.derived]
1174///         'private'
1175///         'protected'
1176///         'public'
1177AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1178  switch (Tok.getKind()) {
1179  default: return AS_none;
1180  case tok::kw_private: return AS_private;
1181  case tok::kw_protected: return AS_protected;
1182  case tok::kw_public: return AS_public;
1183  }
1184}
1185
1186void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1187                                             Decl *ThisDecl) {
1188  // We just declared a member function. If this member function
1189  // has any default arguments, we'll need to parse them later.
1190  LateParsedMethodDeclaration *LateMethod = 0;
1191  DeclaratorChunk::FunctionTypeInfo &FTI
1192    = DeclaratorInfo.getTypeObject(0).Fun;
1193  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1194    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1195      if (!LateMethod) {
1196        // Push this method onto the stack of late-parsed method
1197        // declarations.
1198        getCurrentClass().MethodDecls.push_back(
1199                                LateParsedMethodDeclaration(ThisDecl));
1200        LateMethod = &getCurrentClass().MethodDecls.back();
1201        LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1202
1203        // Add all of the parameters prior to this one (they don't
1204        // have default arguments).
1205        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1206        for (unsigned I = 0; I < ParamIdx; ++I)
1207          LateMethod->DefaultArgs.push_back(
1208                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1209      }
1210
1211      // Add this parameter to the list of parameters (it or may
1212      // not have a default argument).
1213      LateMethod->DefaultArgs.push_back(
1214        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1215                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1216    }
1217  }
1218}
1219
1220/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1221///
1222///       member-declaration:
1223///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1224///         function-definition ';'[opt]
1225///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1226///         using-declaration                                            [TODO]
1227/// [C++0x] static_assert-declaration
1228///         template-declaration
1229/// [GNU]   '__extension__' member-declaration
1230///
1231///       member-declarator-list:
1232///         member-declarator
1233///         member-declarator-list ',' member-declarator
1234///
1235///       member-declarator:
1236///         declarator pure-specifier[opt]
1237///         declarator constant-initializer[opt]
1238///         identifier[opt] ':' constant-expression
1239///
1240///       pure-specifier:
1241///         '= 0'
1242///
1243///       constant-initializer:
1244///         '=' constant-expression
1245///
1246void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1247                                       const ParsedTemplateInfo &TemplateInfo,
1248                                       ParsingDeclRAIIObject *TemplateDiags) {
1249  // Access declarations.
1250  if (!TemplateInfo.Kind &&
1251      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1252      !TryAnnotateCXXScopeToken() &&
1253      Tok.is(tok::annot_cxxscope)) {
1254    bool isAccessDecl = false;
1255    if (NextToken().is(tok::identifier))
1256      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1257    else
1258      isAccessDecl = NextToken().is(tok::kw_operator);
1259
1260    if (isAccessDecl) {
1261      // Collect the scope specifier token we annotated earlier.
1262      CXXScopeSpec SS;
1263      ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1264
1265      // Try to parse an unqualified-id.
1266      UnqualifiedId Name;
1267      if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) {
1268        SkipUntil(tok::semi);
1269        return;
1270      }
1271
1272      // TODO: recover from mistakenly-qualified operator declarations.
1273      if (ExpectAndConsume(tok::semi,
1274                           diag::err_expected_semi_after,
1275                           "access declaration",
1276                           tok::semi))
1277        return;
1278
1279      Actions.ActOnUsingDeclaration(getCurScope(), AS,
1280                                    false, SourceLocation(),
1281                                    SS, Name,
1282                                    /* AttrList */ 0,
1283                                    /* IsTypeName */ false,
1284                                    SourceLocation());
1285      return;
1286    }
1287  }
1288
1289  // static_assert-declaration
1290  if (Tok.is(tok::kw_static_assert)) {
1291    // FIXME: Check for templates
1292    SourceLocation DeclEnd;
1293    ParseStaticAssertDeclaration(DeclEnd);
1294    return;
1295  }
1296
1297  if (Tok.is(tok::kw_template)) {
1298    assert(!TemplateInfo.TemplateParams &&
1299           "Nested template improperly parsed?");
1300    SourceLocation DeclEnd;
1301    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1302                                         AS);
1303    return;
1304  }
1305
1306  // Handle:  member-declaration ::= '__extension__' member-declaration
1307  if (Tok.is(tok::kw___extension__)) {
1308    // __extension__ silences extension warnings in the subexpression.
1309    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1310    ConsumeToken();
1311    return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags);
1312  }
1313
1314  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1315  // is a bitfield.
1316  ColonProtectionRAIIObject X(*this);
1317
1318  CXX0XAttributeList AttrList;
1319  // Optional C++0x attribute-specifier
1320  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1321    AttrList = ParseCXX0XAttributes();
1322
1323  if (Tok.is(tok::kw_using)) {
1324    // FIXME: Check for template aliases
1325
1326    if (AttrList.HasAttr)
1327      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1328        << AttrList.Range;
1329
1330    // Eat 'using'.
1331    SourceLocation UsingLoc = ConsumeToken();
1332
1333    if (Tok.is(tok::kw_namespace)) {
1334      Diag(UsingLoc, diag::err_using_namespace_in_class);
1335      SkipUntil(tok::semi, true, true);
1336    } else {
1337      SourceLocation DeclEnd;
1338      // Otherwise, it must be using-declaration.
1339      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1340    }
1341    return;
1342  }
1343
1344  SourceLocation DSStart = Tok.getLocation();
1345  // decl-specifier-seq:
1346  // Parse the common declaration-specifiers piece.
1347  ParsingDeclSpec DS(*this, TemplateDiags);
1348  DS.AddAttributes(AttrList.AttrList);
1349  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1350
1351  MultiTemplateParamsArg TemplateParams(Actions,
1352      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1353      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1354
1355  if (Tok.is(tok::semi)) {
1356    ConsumeToken();
1357    Decl *TheDecl =
1358      Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
1359    DS.complete(TheDecl);
1360    return;
1361  }
1362
1363  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1364
1365  if (Tok.isNot(tok::colon)) {
1366    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1367    ColonProtectionRAIIObject X(*this);
1368
1369    // Parse the first declarator.
1370    ParseDeclarator(DeclaratorInfo);
1371    // Error parsing the declarator?
1372    if (!DeclaratorInfo.hasName()) {
1373      // If so, skip until the semi-colon or a }.
1374      SkipUntil(tok::r_brace, true);
1375      if (Tok.is(tok::semi))
1376        ConsumeToken();
1377      return;
1378    }
1379
1380    // If attributes exist after the declarator, but before an '{', parse them.
1381    if (Tok.is(tok::kw___attribute)) {
1382      SourceLocation Loc;
1383      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1384      DeclaratorInfo.AddAttributes(AttrList, Loc);
1385    }
1386
1387    // function-definition:
1388    if (Tok.is(tok::l_brace)
1389        || (DeclaratorInfo.isFunctionDeclarator() &&
1390            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1391      if (!DeclaratorInfo.isFunctionDeclarator()) {
1392        Diag(Tok, diag::err_func_def_no_params);
1393        ConsumeBrace();
1394        SkipUntil(tok::r_brace, true);
1395        return;
1396      }
1397
1398      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1399        Diag(Tok, diag::err_function_declared_typedef);
1400        // This recovery skips the entire function body. It would be nice
1401        // to simply call ParseCXXInlineMethodDef() below, however Sema
1402        // assumes the declarator represents a function, not a typedef.
1403        ConsumeBrace();
1404        SkipUntil(tok::r_brace, true);
1405        return;
1406      }
1407
1408      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1409      return;
1410    }
1411  }
1412
1413  // member-declarator-list:
1414  //   member-declarator
1415  //   member-declarator-list ',' member-declarator
1416
1417  llvm::SmallVector<Decl *, 8> DeclsInGroup;
1418  ExprResult BitfieldSize;
1419  ExprResult Init;
1420  bool Deleted = false;
1421
1422  while (1) {
1423    // member-declarator:
1424    //   declarator pure-specifier[opt]
1425    //   declarator constant-initializer[opt]
1426    //   identifier[opt] ':' constant-expression
1427    if (Tok.is(tok::colon)) {
1428      ConsumeToken();
1429      BitfieldSize = ParseConstantExpression();
1430      if (BitfieldSize.isInvalid())
1431        SkipUntil(tok::comma, true, true);
1432    }
1433
1434    // pure-specifier:
1435    //   '= 0'
1436    //
1437    // constant-initializer:
1438    //   '=' constant-expression
1439    //
1440    // defaulted/deleted function-definition:
1441    //   '=' 'default'                          [TODO]
1442    //   '=' 'delete'
1443    if (Tok.is(tok::equal)) {
1444      ConsumeToken();
1445      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1446        ConsumeToken();
1447        Deleted = true;
1448      } else {
1449        Init = ParseInitializer();
1450        if (Init.isInvalid())
1451          SkipUntil(tok::comma, true, true);
1452      }
1453    }
1454
1455    // If a simple-asm-expr is present, parse it.
1456    if (Tok.is(tok::kw_asm)) {
1457      SourceLocation Loc;
1458      ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1459      if (AsmLabel.isInvalid())
1460        SkipUntil(tok::comma, true, true);
1461
1462      DeclaratorInfo.setAsmLabel(AsmLabel.release());
1463      DeclaratorInfo.SetRangeEnd(Loc);
1464    }
1465
1466    // If attributes exist after the declarator, parse them.
1467    if (Tok.is(tok::kw___attribute)) {
1468      SourceLocation Loc;
1469      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1470      DeclaratorInfo.AddAttributes(AttrList, Loc);
1471    }
1472
1473    // NOTE: If Sema is the Action module and declarator is an instance field,
1474    // this call will *not* return the created decl; It will return null.
1475    // See Sema::ActOnCXXMemberDeclarator for details.
1476
1477    Decl *ThisDecl = 0;
1478    if (DS.isFriendSpecified()) {
1479      // TODO: handle initializers, bitfields, 'delete'
1480      ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
1481                                                 /*IsDefinition*/ false,
1482                                                 move(TemplateParams));
1483    } else {
1484      ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
1485                                                  DeclaratorInfo,
1486                                                  move(TemplateParams),
1487                                                  BitfieldSize.release(),
1488                                                  Init.release(),
1489                                                  /*IsDefinition*/Deleted,
1490                                                  Deleted);
1491    }
1492    if (ThisDecl)
1493      DeclsInGroup.push_back(ThisDecl);
1494
1495    if (DeclaratorInfo.isFunctionDeclarator() &&
1496        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1497          != DeclSpec::SCS_typedef) {
1498      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1499    }
1500
1501    DeclaratorInfo.complete(ThisDecl);
1502
1503    // If we don't have a comma, it is either the end of the list (a ';')
1504    // or an error, bail out.
1505    if (Tok.isNot(tok::comma))
1506      break;
1507
1508    // Consume the comma.
1509    ConsumeToken();
1510
1511    // Parse the next declarator.
1512    DeclaratorInfo.clear();
1513    BitfieldSize = 0;
1514    Init = 0;
1515    Deleted = false;
1516
1517    // Attributes are only allowed on the second declarator.
1518    if (Tok.is(tok::kw___attribute)) {
1519      SourceLocation Loc;
1520      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1521      DeclaratorInfo.AddAttributes(AttrList, Loc);
1522    }
1523
1524    if (Tok.isNot(tok::colon))
1525      ParseDeclarator(DeclaratorInfo);
1526  }
1527
1528  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1529    // Skip to end of block or statement.
1530    SkipUntil(tok::r_brace, true, true);
1531    // If we stopped at a ';', eat it.
1532    if (Tok.is(tok::semi)) ConsumeToken();
1533    return;
1534  }
1535
1536  Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
1537                                  DeclsInGroup.size());
1538}
1539
1540/// ParseCXXMemberSpecification - Parse the class definition.
1541///
1542///       member-specification:
1543///         member-declaration member-specification[opt]
1544///         access-specifier ':' member-specification[opt]
1545///
1546void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1547                                         unsigned TagType, Decl *TagDecl) {
1548  assert((TagType == DeclSpec::TST_struct ||
1549         TagType == DeclSpec::TST_union  ||
1550         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1551
1552  PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
1553                                      "parsing struct/union/class body");
1554
1555  // Determine whether this is a non-nested class. Note that local
1556  // classes are *not* considered to be nested classes.
1557  bool NonNestedClass = true;
1558  if (!ClassStack.empty()) {
1559    for (const Scope *S = getCurScope(); S; S = S->getParent()) {
1560      if (S->isClassScope()) {
1561        // We're inside a class scope, so this is a nested class.
1562        NonNestedClass = false;
1563        break;
1564      }
1565
1566      if ((S->getFlags() & Scope::FnScope)) {
1567        // If we're in a function or function template declared in the
1568        // body of a class, then this is a local class rather than a
1569        // nested class.
1570        const Scope *Parent = S->getParent();
1571        if (Parent->isTemplateParamScope())
1572          Parent = Parent->getParent();
1573        if (Parent->isClassScope())
1574          break;
1575      }
1576    }
1577  }
1578
1579  // Enter a scope for the class.
1580  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1581
1582  // Note that we are parsing a new (potentially-nested) class definition.
1583  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1584
1585  if (TagDecl)
1586    Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
1587
1588  if (Tok.is(tok::colon)) {
1589    ParseBaseClause(TagDecl);
1590
1591    if (!Tok.is(tok::l_brace)) {
1592      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1593
1594      if (TagDecl)
1595        Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
1596      return;
1597    }
1598  }
1599
1600  assert(Tok.is(tok::l_brace));
1601
1602  SourceLocation LBraceLoc = ConsumeBrace();
1603
1604  if (TagDecl)
1605    Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, LBraceLoc);
1606
1607  // C++ 11p3: Members of a class defined with the keyword class are private
1608  // by default. Members of a class defined with the keywords struct or union
1609  // are public by default.
1610  AccessSpecifier CurAS;
1611  if (TagType == DeclSpec::TST_class)
1612    CurAS = AS_private;
1613  else
1614    CurAS = AS_public;
1615
1616  SourceLocation RBraceLoc;
1617  if (TagDecl) {
1618    // While we still have something to read, read the member-declarations.
1619    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1620      // Each iteration of this loop reads one member-declaration.
1621
1622      // Check for extraneous top-level semicolon.
1623      if (Tok.is(tok::semi)) {
1624        Diag(Tok, diag::ext_extra_struct_semi)
1625          << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
1626          << FixItHint::CreateRemoval(Tok.getLocation());
1627        ConsumeToken();
1628        continue;
1629      }
1630
1631      AccessSpecifier AS = getAccessSpecifierIfPresent();
1632      if (AS != AS_none) {
1633        // Current token is a C++ access specifier.
1634        CurAS = AS;
1635        SourceLocation ASLoc = Tok.getLocation();
1636        ConsumeToken();
1637        if (Tok.is(tok::colon))
1638          Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
1639        else
1640          Diag(Tok, diag::err_expected_colon);
1641        ConsumeToken();
1642        continue;
1643      }
1644
1645      // FIXME: Make sure we don't have a template here.
1646
1647      // Parse all the comma separated declarators.
1648      ParseCXXClassMemberDeclaration(CurAS);
1649    }
1650
1651    RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1652  } else {
1653    SkipUntil(tok::r_brace, false, false);
1654  }
1655
1656  // If attributes exist after class contents, parse them.
1657  llvm::OwningPtr<AttributeList> AttrList;
1658  if (Tok.is(tok::kw___attribute))
1659    AttrList.reset(ParseGNUAttributes());
1660
1661  if (TagDecl)
1662    Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
1663                                              LBraceLoc, RBraceLoc,
1664                                              AttrList.get());
1665
1666  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1667  // complete within function bodies, default arguments,
1668  // exception-specifications, and constructor ctor-initializers (including
1669  // such things in nested classes).
1670  //
1671  // FIXME: Only function bodies and constructor ctor-initializers are
1672  // parsed correctly, fix the rest.
1673  if (TagDecl && NonNestedClass) {
1674    // We are not inside a nested class. This class and its nested classes
1675    // are complete and we can parse the delayed portions of method
1676    // declarations and the lexed inline method definitions.
1677    SourceLocation SavedPrevTokLocation = PrevTokLocation;
1678    ParseLexedMethodDeclarations(getCurrentClass());
1679    ParseLexedMethodDefs(getCurrentClass());
1680    PrevTokLocation = SavedPrevTokLocation;
1681  }
1682
1683  if (TagDecl)
1684    Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc);
1685
1686  // Leave the class scope.
1687  ParsingDef.Pop();
1688  ClassScope.Exit();
1689}
1690
1691/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1692/// which explicitly initializes the members or base classes of a
1693/// class (C++ [class.base.init]). For example, the three initializers
1694/// after the ':' in the Derived constructor below:
1695///
1696/// @code
1697/// class Base { };
1698/// class Derived : Base {
1699///   int x;
1700///   float f;
1701/// public:
1702///   Derived(float f) : Base(), x(17), f(f) { }
1703/// };
1704/// @endcode
1705///
1706/// [C++]  ctor-initializer:
1707///          ':' mem-initializer-list
1708///
1709/// [C++]  mem-initializer-list:
1710///          mem-initializer
1711///          mem-initializer , mem-initializer-list
1712void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
1713  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1714
1715  SourceLocation ColonLoc = ConsumeToken();
1716
1717  llvm::SmallVector<CXXBaseOrMemberInitializer*, 4> MemInitializers;
1718  bool AnyErrors = false;
1719
1720  do {
1721    if (Tok.is(tok::code_completion)) {
1722      Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
1723                                                 MemInitializers.data(),
1724                                                 MemInitializers.size());
1725      ConsumeCodeCompletionToken();
1726    } else {
1727      MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1728      if (!MemInit.isInvalid())
1729        MemInitializers.push_back(MemInit.get());
1730      else
1731        AnyErrors = true;
1732    }
1733
1734    if (Tok.is(tok::comma))
1735      ConsumeToken();
1736    else if (Tok.is(tok::l_brace))
1737      break;
1738    // If the next token looks like a base or member initializer, assume that
1739    // we're just missing a comma.
1740    else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))
1741      Diag(Tok.getLocation(), diag::err_ctor_init_missing_comma)
1742        << FixItHint::CreateInsertion(PP.getLocForEndOfToken(PrevTokLocation),
1743                                      ", ");
1744    else {
1745      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1746      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1747      SkipUntil(tok::l_brace, true, true);
1748      break;
1749    }
1750  } while (true);
1751
1752  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1753                               MemInitializers.data(), MemInitializers.size(),
1754                               AnyErrors);
1755}
1756
1757/// ParseMemInitializer - Parse a C++ member initializer, which is
1758/// part of a constructor initializer that explicitly initializes one
1759/// member or base class (C++ [class.base.init]). See
1760/// ParseConstructorInitializer for an example.
1761///
1762/// [C++] mem-initializer:
1763///         mem-initializer-id '(' expression-list[opt] ')'
1764///
1765/// [C++] mem-initializer-id:
1766///         '::'[opt] nested-name-specifier[opt] class-name
1767///         identifier
1768Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
1769  // parse '::'[opt] nested-name-specifier[opt]
1770  CXXScopeSpec SS;
1771  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1772  ParsedType TemplateTypeTy;
1773  if (Tok.is(tok::annot_template_id)) {
1774    TemplateIdAnnotation *TemplateId
1775      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1776    if (TemplateId->Kind == TNK_Type_template ||
1777        TemplateId->Kind == TNK_Dependent_template_name) {
1778      AnnotateTemplateIdTokenAsType(&SS);
1779      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1780      TemplateTypeTy = getTypeAnnotation(Tok);
1781    }
1782  }
1783  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1784    Diag(Tok, diag::err_expected_member_or_base_name);
1785    return true;
1786  }
1787
1788  // Get the identifier. This may be a member name or a class name,
1789  // but we'll let the semantic analysis determine which it is.
1790  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1791  SourceLocation IdLoc = ConsumeToken();
1792
1793  // Parse the '('.
1794  if (Tok.isNot(tok::l_paren)) {
1795    Diag(Tok, diag::err_expected_lparen);
1796    return true;
1797  }
1798  SourceLocation LParenLoc = ConsumeParen();
1799
1800  // Parse the optional expression-list.
1801  ExprVector ArgExprs(Actions);
1802  CommaLocsTy CommaLocs;
1803  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1804    SkipUntil(tok::r_paren);
1805    return true;
1806  }
1807
1808  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1809
1810  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
1811                                     TemplateTypeTy, IdLoc,
1812                                     LParenLoc, ArgExprs.take(),
1813                                     ArgExprs.size(), CommaLocs.data(),
1814                                     RParenLoc);
1815}
1816
1817/// ParseExceptionSpecification - Parse a C++ exception-specification
1818/// (C++ [except.spec]).
1819///
1820///       exception-specification:
1821///         'throw' '(' type-id-list [opt] ')'
1822/// [MS]    'throw' '(' '...' ')'
1823///
1824///       type-id-list:
1825///         type-id
1826///         type-id-list ',' type-id
1827///
1828bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1829                                         llvm::SmallVectorImpl<ParsedType>
1830                                             &Exceptions,
1831                                         llvm::SmallVectorImpl<SourceRange>
1832                                             &Ranges,
1833                                         bool &hasAnyExceptionSpec) {
1834  assert(Tok.is(tok::kw_throw) && "expected throw");
1835
1836  SourceLocation ThrowLoc = ConsumeToken();
1837
1838  if (!Tok.is(tok::l_paren)) {
1839    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1840  }
1841  SourceLocation LParenLoc = ConsumeParen();
1842
1843  // Parse throw(...), a Microsoft extension that means "this function
1844  // can throw anything".
1845  if (Tok.is(tok::ellipsis)) {
1846    hasAnyExceptionSpec = true;
1847    SourceLocation EllipsisLoc = ConsumeToken();
1848    if (!getLang().Microsoft)
1849      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1850    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1851    return false;
1852  }
1853
1854  // Parse the sequence of type-ids.
1855  SourceRange Range;
1856  while (Tok.isNot(tok::r_paren)) {
1857    TypeResult Res(ParseTypeName(&Range));
1858    if (!Res.isInvalid()) {
1859      Exceptions.push_back(Res.get());
1860      Ranges.push_back(Range);
1861    }
1862    if (Tok.is(tok::comma))
1863      ConsumeToken();
1864    else
1865      break;
1866  }
1867
1868  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1869  return false;
1870}
1871
1872/// \brief We have just started parsing the definition of a new class,
1873/// so push that class onto our stack of classes that is currently
1874/// being parsed.
1875void Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
1876  assert((NonNestedClass || !ClassStack.empty()) &&
1877         "Nested class without outer class");
1878  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
1879}
1880
1881/// \brief Deallocate the given parsed class and all of its nested
1882/// classes.
1883void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1884  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1885    DeallocateParsedClasses(Class->NestedClasses[I]);
1886  delete Class;
1887}
1888
1889/// \brief Pop the top class of the stack of classes that are
1890/// currently being parsed.
1891///
1892/// This routine should be called when we have finished parsing the
1893/// definition of a class, but have not yet popped the Scope
1894/// associated with the class's definition.
1895///
1896/// \returns true if the class we've popped is a top-level class,
1897/// false otherwise.
1898void Parser::PopParsingClass() {
1899  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1900
1901  ParsingClass *Victim = ClassStack.top();
1902  ClassStack.pop();
1903  if (Victim->TopLevelClass) {
1904    // Deallocate all of the nested classes of this class,
1905    // recursively: we don't need to keep any of this information.
1906    DeallocateParsedClasses(Victim);
1907    return;
1908  }
1909  assert(!ClassStack.empty() && "Missing top-level class?");
1910
1911  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1912      Victim->NestedClasses.empty()) {
1913    // The victim is a nested class, but we will not need to perform
1914    // any processing after the definition of this class since it has
1915    // no members whose handling was delayed. Therefore, we can just
1916    // remove this nested class.
1917    delete Victim;
1918    return;
1919  }
1920
1921  // This nested class has some members that will need to be processed
1922  // after the top-level class is completely defined. Therefore, add
1923  // it to the list of nested classes within its parent.
1924  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
1925  ClassStack.top()->NestedClasses.push_back(Victim);
1926  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
1927}
1928
1929/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1930/// parses standard attributes.
1931///
1932/// [C++0x] attribute-specifier:
1933///         '[' '[' attribute-list ']' ']'
1934///
1935/// [C++0x] attribute-list:
1936///         attribute[opt]
1937///         attribute-list ',' attribute[opt]
1938///
1939/// [C++0x] attribute:
1940///         attribute-token attribute-argument-clause[opt]
1941///
1942/// [C++0x] attribute-token:
1943///         identifier
1944///         attribute-scoped-token
1945///
1946/// [C++0x] attribute-scoped-token:
1947///         attribute-namespace '::' identifier
1948///
1949/// [C++0x] attribute-namespace:
1950///         identifier
1951///
1952/// [C++0x] attribute-argument-clause:
1953///         '(' balanced-token-seq ')'
1954///
1955/// [C++0x] balanced-token-seq:
1956///         balanced-token
1957///         balanced-token-seq balanced-token
1958///
1959/// [C++0x] balanced-token:
1960///         '(' balanced-token-seq ')'
1961///         '[' balanced-token-seq ']'
1962///         '{' balanced-token-seq '}'
1963///         any token but '(', ')', '[', ']', '{', or '}'
1964CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1965  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1966      && "Not a C++0x attribute list");
1967
1968  SourceLocation StartLoc = Tok.getLocation(), Loc;
1969  AttributeList *CurrAttr = 0;
1970
1971  ConsumeBracket();
1972  ConsumeBracket();
1973
1974  if (Tok.is(tok::comma)) {
1975    Diag(Tok.getLocation(), diag::err_expected_ident);
1976    ConsumeToken();
1977  }
1978
1979  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1980    // attribute not present
1981    if (Tok.is(tok::comma)) {
1982      ConsumeToken();
1983      continue;
1984    }
1985
1986    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1987    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1988
1989    // scoped attribute
1990    if (Tok.is(tok::coloncolon)) {
1991      ConsumeToken();
1992
1993      if (!Tok.is(tok::identifier)) {
1994        Diag(Tok.getLocation(), diag::err_expected_ident);
1995        SkipUntil(tok::r_square, tok::comma, true, true);
1996        continue;
1997      }
1998
1999      ScopeName = AttrName;
2000      ScopeLoc = AttrLoc;
2001
2002      AttrName = Tok.getIdentifierInfo();
2003      AttrLoc = ConsumeToken();
2004    }
2005
2006    bool AttrParsed = false;
2007    // No scoped names are supported; ideally we could put all non-standard
2008    // attributes into namespaces.
2009    if (!ScopeName) {
2010      switch(AttributeList::getKind(AttrName))
2011      {
2012      // No arguments
2013      case AttributeList::AT_base_check:
2014      case AttributeList::AT_carries_dependency:
2015      case AttributeList::AT_final:
2016      case AttributeList::AT_hiding:
2017      case AttributeList::AT_noreturn:
2018      case AttributeList::AT_override: {
2019        if (Tok.is(tok::l_paren)) {
2020          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
2021            << AttrName->getName();
2022          break;
2023        }
2024
2025        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
2026                                     SourceLocation(), 0, 0, CurrAttr, false,
2027                                     true);
2028        AttrParsed = true;
2029        break;
2030      }
2031
2032      // One argument; must be a type-id or assignment-expression
2033      case AttributeList::AT_aligned: {
2034        if (Tok.isNot(tok::l_paren)) {
2035          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
2036            << AttrName->getName();
2037          break;
2038        }
2039        SourceLocation ParamLoc = ConsumeParen();
2040
2041        ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
2042
2043        MatchRHSPunctuation(tok::r_paren, ParamLoc);
2044
2045        ExprVector ArgExprs(Actions);
2046        ArgExprs.push_back(ArgExpr.release());
2047        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
2048                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
2049                                     false, true);
2050
2051        AttrParsed = true;
2052        break;
2053      }
2054
2055      // Silence warnings
2056      default: break;
2057      }
2058    }
2059
2060    // Skip the entire parameter clause, if any
2061    if (!AttrParsed && Tok.is(tok::l_paren)) {
2062      ConsumeParen();
2063      // SkipUntil maintains the balancedness of tokens.
2064      SkipUntil(tok::r_paren, false);
2065    }
2066  }
2067
2068  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2069    SkipUntil(tok::r_square, false);
2070  Loc = Tok.getLocation();
2071  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2072    SkipUntil(tok::r_square, false);
2073
2074  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
2075  return Attr;
2076}
2077
2078/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
2079/// attribute.
2080///
2081/// FIXME: Simply returns an alignof() expression if the argument is a
2082/// type. Ideally, the type should be propagated directly into Sema.
2083///
2084/// [C++0x] 'align' '(' type-id ')'
2085/// [C++0x] 'align' '(' assignment-expression ')'
2086ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2087  if (isTypeIdInParens()) {
2088    EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
2089    SourceLocation TypeLoc = Tok.getLocation();
2090    ParsedType Ty = ParseTypeName().get();
2091    SourceRange TypeRange(Start, Tok.getLocation());
2092    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true,
2093                                          Ty.getAsOpaquePtr(), TypeRange);
2094  } else
2095    return ParseConstantExpression();
2096}
2097