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  ObjCDeclContextSwitch ObjCDC(*this);
56
57  if (Tok.is(tok::code_completion)) {
58    Actions.CodeCompleteNamespaceDecl(getCurScope());
59    cutOffParsing();
60    return 0;
61  }
62
63  SourceLocation IdentLoc;
64  IdentifierInfo *Ident = 0;
65  std::vector<SourceLocation> ExtraIdentLoc;
66  std::vector<IdentifierInfo*> ExtraIdent;
67  std::vector<SourceLocation> ExtraNamespaceLoc;
68
69  Token attrTok;
70
71  if (Tok.is(tok::identifier)) {
72    Ident = Tok.getIdentifierInfo();
73    IdentLoc = ConsumeToken();  // eat the identifier.
74    while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
75      ExtraNamespaceLoc.push_back(ConsumeToken());
76      ExtraIdent.push_back(Tok.getIdentifierInfo());
77      ExtraIdentLoc.push_back(ConsumeToken());
78    }
79  }
80
81  // Read label attributes, if present.
82  ParsedAttributes attrs(AttrFactory);
83  if (Tok.is(tok::kw___attribute)) {
84    attrTok = Tok;
85    ParseGNUAttributes(attrs);
86  }
87
88  if (Tok.is(tok::equal)) {
89    if (!attrs.empty())
90      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
91    if (InlineLoc.isValid())
92      Diag(InlineLoc, diag::err_inline_namespace_alias)
93          << FixItHint::CreateRemoval(InlineLoc);
94    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
95  }
96
97
98  BalancedDelimiterTracker T(*this, tok::l_brace);
99  if (T.consumeOpen()) {
100    if (!ExtraIdent.empty()) {
101      Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
102          << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
103    }
104    Diag(Tok, Ident ? diag::err_expected_lbrace :
105         diag::err_expected_ident_lbrace);
106    return 0;
107  }
108
109  if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
110      getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
111      getCurScope()->getFnParent()) {
112    if (!ExtraIdent.empty()) {
113      Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
114          << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
115    }
116    Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
117    SkipUntil(tok::r_brace, false);
118    return 0;
119  }
120
121  if (!ExtraIdent.empty()) {
122    TentativeParsingAction TPA(*this);
123    SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true);
124    Token rBraceToken = Tok;
125    TPA.Revert();
126
127    if (!rBraceToken.is(tok::r_brace)) {
128      Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
129          << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
130    } else {
131      std::string NamespaceFix;
132      for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
133           E = ExtraIdent.end(); I != E; ++I) {
134        NamespaceFix += " { namespace ";
135        NamespaceFix += (*I)->getName();
136      }
137
138      std::string RBraces;
139      for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
140        RBraces +=  "} ";
141
142      Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
143          << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
144                                                      ExtraIdentLoc.back()),
145                                          NamespaceFix)
146          << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
147    }
148  }
149
150  // If we're still good, complain about inline namespaces in non-C++0x now.
151  if (InlineLoc.isValid())
152    Diag(InlineLoc, getLang().CPlusPlus0x ?
153         diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
154
155  // Enter a scope for the namespace.
156  ParseScope NamespaceScope(this, Scope::DeclScope);
157
158  Decl *NamespcDecl =
159    Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
160                                   IdentLoc, Ident, T.getOpenLocation(),
161                                   attrs.getList());
162
163  PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
164                                      "parsing namespace");
165
166  // Parse the contents of the namespace.  This includes parsing recovery on
167  // any improperly nested namespaces.
168  ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
169                      InlineLoc, attrs, T);
170
171  // Leave the namespace scope.
172  NamespaceScope.Exit();
173
174  DeclEnd = T.getCloseLocation();
175  Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
176
177  return NamespcDecl;
178}
179
180/// ParseInnerNamespace - Parse the contents of a namespace.
181void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc,
182                                 std::vector<IdentifierInfo*>& Ident,
183                                 std::vector<SourceLocation>& NamespaceLoc,
184                                 unsigned int index, SourceLocation& InlineLoc,
185                                 ParsedAttributes& attrs,
186                                 BalancedDelimiterTracker &Tracker) {
187  if (index == Ident.size()) {
188    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
189      ParsedAttributesWithRange attrs(AttrFactory);
190      MaybeParseCXX0XAttributes(attrs);
191      MaybeParseMicrosoftAttributes(attrs);
192      ParseExternalDeclaration(attrs);
193    }
194
195    // The caller is what called check -- we are simply calling
196    // the close for it.
197    Tracker.consumeClose();
198
199    return;
200  }
201
202  // Parse improperly nested namespaces.
203  ParseScope NamespaceScope(this, Scope::DeclScope);
204  Decl *NamespcDecl =
205    Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
206                                   NamespaceLoc[index], IdentLoc[index],
207                                   Ident[index], Tracker.getOpenLocation(),
208                                   attrs.getList());
209
210  ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
211                      attrs, Tracker);
212
213  NamespaceScope.Exit();
214
215  Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
216}
217
218/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
219/// alias definition.
220///
221Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
222                                  SourceLocation AliasLoc,
223                                  IdentifierInfo *Alias,
224                                  SourceLocation &DeclEnd) {
225  assert(Tok.is(tok::equal) && "Not equal token");
226
227  ConsumeToken(); // eat the '='.
228
229  if (Tok.is(tok::code_completion)) {
230    Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
231    cutOffParsing();
232    return 0;
233  }
234
235  CXXScopeSpec SS;
236  // Parse (optional) nested-name-specifier.
237  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
238
239  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
240    Diag(Tok, diag::err_expected_namespace_name);
241    // Skip to end of the definition and eat the ';'.
242    SkipUntil(tok::semi);
243    return 0;
244  }
245
246  // Parse identifier.
247  IdentifierInfo *Ident = Tok.getIdentifierInfo();
248  SourceLocation IdentLoc = ConsumeToken();
249
250  // Eat the ';'.
251  DeclEnd = Tok.getLocation();
252  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
253                   "", tok::semi);
254
255  return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
256                                        SS, IdentLoc, Ident);
257}
258
259/// ParseLinkage - We know that the current token is a string_literal
260/// and just before that, that extern was seen.
261///
262///       linkage-specification: [C++ 7.5p2: dcl.link]
263///         'extern' string-literal '{' declaration-seq[opt] '}'
264///         'extern' string-literal declaration
265///
266Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
267  assert(Tok.is(tok::string_literal) && "Not a string literal!");
268  llvm::SmallString<8> LangBuffer;
269  bool Invalid = false;
270  StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
271  if (Invalid)
272    return 0;
273
274  SourceLocation Loc = ConsumeStringToken();
275
276  ParseScope LinkageScope(this, Scope::DeclScope);
277  Decl *LinkageSpec
278    = Actions.ActOnStartLinkageSpecification(getCurScope(),
279                                             DS.getSourceRange().getBegin(),
280                                             Loc, Lang,
281                                      Tok.is(tok::l_brace) ? Tok.getLocation()
282                                                           : SourceLocation());
283
284  ParsedAttributesWithRange attrs(AttrFactory);
285  MaybeParseCXX0XAttributes(attrs);
286  MaybeParseMicrosoftAttributes(attrs);
287
288  if (Tok.isNot(tok::l_brace)) {
289    // Reset the source range in DS, as the leading "extern"
290    // does not really belong to the inner declaration ...
291    DS.SetRangeStart(SourceLocation());
292    DS.SetRangeEnd(SourceLocation());
293    // ... but anyway remember that such an "extern" was seen.
294    DS.setExternInLinkageSpec(true);
295    ParseExternalDeclaration(attrs, &DS);
296    return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
297                                                   SourceLocation());
298  }
299
300  DS.abort();
301
302  ProhibitAttributes(attrs);
303
304  BalancedDelimiterTracker T(*this, tok::l_brace);
305  T.consumeOpen();
306  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
307    ParsedAttributesWithRange attrs(AttrFactory);
308    MaybeParseCXX0XAttributes(attrs);
309    MaybeParseMicrosoftAttributes(attrs);
310    ParseExternalDeclaration(attrs);
311  }
312
313  T.consumeClose();
314  return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
315                                                 T.getCloseLocation());
316}
317
318/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
319/// using-directive. Assumes that current token is 'using'.
320Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
321                                         const ParsedTemplateInfo &TemplateInfo,
322                                               SourceLocation &DeclEnd,
323                                             ParsedAttributesWithRange &attrs,
324                                               Decl **OwnedType) {
325  assert(Tok.is(tok::kw_using) && "Not using token");
326  ObjCDeclContextSwitch ObjCDC(*this);
327
328  // Eat 'using'.
329  SourceLocation UsingLoc = ConsumeToken();
330
331  if (Tok.is(tok::code_completion)) {
332    Actions.CodeCompleteUsing(getCurScope());
333    cutOffParsing();
334    return 0;
335  }
336
337  // 'using namespace' means this is a using-directive.
338  if (Tok.is(tok::kw_namespace)) {
339    // Template parameters are always an error here.
340    if (TemplateInfo.Kind) {
341      SourceRange R = TemplateInfo.getSourceRange();
342      Diag(UsingLoc, diag::err_templated_using_directive)
343        << R << FixItHint::CreateRemoval(R);
344    }
345
346    return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
347  }
348
349  // Otherwise, it must be a using-declaration or an alias-declaration.
350
351  // Using declarations can't have attributes.
352  ProhibitAttributes(attrs);
353
354  return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
355                                    AS_none, OwnedType);
356}
357
358/// ParseUsingDirective - Parse C++ using-directive, assumes
359/// that current token is 'namespace' and 'using' was already parsed.
360///
361///       using-directive: [C++ 7.3.p4: namespace.udir]
362///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
363///                 namespace-name ;
364/// [GNU] using-directive:
365///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
366///                 namespace-name attributes[opt] ;
367///
368Decl *Parser::ParseUsingDirective(unsigned Context,
369                                  SourceLocation UsingLoc,
370                                  SourceLocation &DeclEnd,
371                                  ParsedAttributes &attrs) {
372  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
373
374  // Eat 'namespace'.
375  SourceLocation NamespcLoc = ConsumeToken();
376
377  if (Tok.is(tok::code_completion)) {
378    Actions.CodeCompleteUsingDirective(getCurScope());
379    cutOffParsing();
380    return 0;
381  }
382
383  CXXScopeSpec SS;
384  // Parse (optional) nested-name-specifier.
385  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
386
387  IdentifierInfo *NamespcName = 0;
388  SourceLocation IdentLoc = SourceLocation();
389
390  // Parse namespace-name.
391  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
392    Diag(Tok, diag::err_expected_namespace_name);
393    // If there was invalid namespace name, skip to end of decl, and eat ';'.
394    SkipUntil(tok::semi);
395    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
396    return 0;
397  }
398
399  // Parse identifier.
400  NamespcName = Tok.getIdentifierInfo();
401  IdentLoc = ConsumeToken();
402
403  // Parse (optional) attributes (most likely GNU strong-using extension).
404  bool GNUAttr = false;
405  if (Tok.is(tok::kw___attribute)) {
406    GNUAttr = true;
407    ParseGNUAttributes(attrs);
408  }
409
410  // Eat ';'.
411  DeclEnd = Tok.getLocation();
412  ExpectAndConsume(tok::semi,
413                   GNUAttr ? diag::err_expected_semi_after_attribute_list
414                           : diag::err_expected_semi_after_namespace_name,
415                   "", tok::semi);
416
417  return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
418                                     IdentLoc, NamespcName, attrs.getList());
419}
420
421/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
422/// Assumes that 'using' was already seen.
423///
424///     using-declaration: [C++ 7.3.p3: namespace.udecl]
425///       'using' 'typename'[opt] ::[opt] nested-name-specifier
426///               unqualified-id
427///       'using' :: unqualified-id
428///
429///     alias-declaration: C++0x [decl.typedef]p2
430///       'using' identifier = type-id ;
431///
432Decl *Parser::ParseUsingDeclaration(unsigned Context,
433                                    const ParsedTemplateInfo &TemplateInfo,
434                                    SourceLocation UsingLoc,
435                                    SourceLocation &DeclEnd,
436                                    AccessSpecifier AS,
437                                    Decl **OwnedType) {
438  CXXScopeSpec SS;
439  SourceLocation TypenameLoc;
440  bool IsTypeName;
441
442  // Ignore optional 'typename'.
443  // FIXME: This is wrong; we should parse this as a typename-specifier.
444  if (Tok.is(tok::kw_typename)) {
445    TypenameLoc = Tok.getLocation();
446    ConsumeToken();
447    IsTypeName = true;
448  }
449  else
450    IsTypeName = false;
451
452  // Parse nested-name-specifier.
453  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
454
455  // Check nested-name specifier.
456  if (SS.isInvalid()) {
457    SkipUntil(tok::semi);
458    return 0;
459  }
460
461  // Parse the unqualified-id. We allow parsing of both constructor and
462  // destructor names and allow the action module to diagnose any semantic
463  // errors.
464  UnqualifiedId Name;
465  if (ParseUnqualifiedId(SS,
466                         /*EnteringContext=*/false,
467                         /*AllowDestructorName=*/true,
468                         /*AllowConstructorName=*/true,
469                         ParsedType(),
470                         Name)) {
471    SkipUntil(tok::semi);
472    return 0;
473  }
474
475  ParsedAttributes attrs(AttrFactory);
476
477  // Maybe this is an alias-declaration.
478  bool IsAliasDecl = Tok.is(tok::equal);
479  TypeResult TypeAlias;
480  if (IsAliasDecl) {
481    // TODO: Attribute support. C++0x attributes may appear before the equals.
482    // Where can GNU attributes appear?
483    ConsumeToken();
484
485    Diag(Tok.getLocation(), getLang().CPlusPlus0x ?
486         diag::warn_cxx98_compat_alias_declaration :
487         diag::ext_alias_declaration);
488
489    // Type alias templates cannot be specialized.
490    int SpecKind = -1;
491    if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
492        Name.getKind() == UnqualifiedId::IK_TemplateId)
493      SpecKind = 0;
494    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
495      SpecKind = 1;
496    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
497      SpecKind = 2;
498    if (SpecKind != -1) {
499      SourceRange Range;
500      if (SpecKind == 0)
501        Range = SourceRange(Name.TemplateId->LAngleLoc,
502                            Name.TemplateId->RAngleLoc);
503      else
504        Range = TemplateInfo.getSourceRange();
505      Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
506        << SpecKind << Range;
507      SkipUntil(tok::semi);
508      return 0;
509    }
510
511    // Name must be an identifier.
512    if (Name.getKind() != UnqualifiedId::IK_Identifier) {
513      Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
514      // No removal fixit: can't recover from this.
515      SkipUntil(tok::semi);
516      return 0;
517    } else if (IsTypeName)
518      Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
519        << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
520                             SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
521    else if (SS.isNotEmpty())
522      Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
523        << FixItHint::CreateRemoval(SS.getRange());
524
525    TypeAlias = ParseTypeName(0, TemplateInfo.Kind ?
526                              Declarator::AliasTemplateContext :
527                              Declarator::AliasDeclContext, AS, OwnedType);
528  } else
529    // Parse (optional) attributes (most likely GNU strong-using extension).
530    MaybeParseGNUAttributes(attrs);
531
532  // Eat ';'.
533  DeclEnd = Tok.getLocation();
534  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
535                   !attrs.empty() ? "attributes list" :
536                   IsAliasDecl ? "alias declaration" : "using declaration",
537                   tok::semi);
538
539  // Diagnose an attempt to declare a templated using-declaration.
540  // In C++0x, alias-declarations can be templates:
541  //   template <...> using id = type;
542  if (TemplateInfo.Kind && !IsAliasDecl) {
543    SourceRange R = TemplateInfo.getSourceRange();
544    Diag(UsingLoc, diag::err_templated_using_declaration)
545      << R << FixItHint::CreateRemoval(R);
546
547    // Unfortunately, we have to bail out instead of recovering by
548    // ignoring the parameters, just in case the nested name specifier
549    // depends on the parameters.
550    return 0;
551  }
552
553  // "typename" keyword is allowed for identifiers only,
554  // because it may be a type definition.
555  if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) {
556    Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only)
557      << FixItHint::CreateRemoval(SourceRange(TypenameLoc));
558    // Proceed parsing, but reset the IsTypeName flag.
559    IsTypeName = false;
560  }
561
562  if (IsAliasDecl) {
563    TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
564    MultiTemplateParamsArg TemplateParamsArg(Actions,
565      TemplateParams ? TemplateParams->data() : 0,
566      TemplateParams ? TemplateParams->size() : 0);
567    return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
568                                         UsingLoc, Name, TypeAlias);
569  }
570
571  return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS,
572                                       Name, attrs.getList(),
573                                       IsTypeName, TypenameLoc);
574}
575
576/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration.
577///
578/// [C++0x] static_assert-declaration:
579///           static_assert ( constant-expression  ,  string-literal  ) ;
580///
581/// [C1X]   static_assert-declaration:
582///           _Static_assert ( constant-expression  ,  string-literal  ) ;
583///
584Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
585  assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
586         "Not a static_assert declaration");
587
588  if (Tok.is(tok::kw__Static_assert) && !getLang().C1X)
589    Diag(Tok, diag::ext_c1x_static_assert);
590  if (Tok.is(tok::kw_static_assert))
591    Diag(Tok, diag::warn_cxx98_compat_static_assert);
592
593  SourceLocation StaticAssertLoc = ConsumeToken();
594
595  BalancedDelimiterTracker T(*this, tok::l_paren);
596  if (T.consumeOpen()) {
597    Diag(Tok, diag::err_expected_lparen);
598    return 0;
599  }
600
601  ExprResult AssertExpr(ParseConstantExpression());
602  if (AssertExpr.isInvalid()) {
603    SkipUntil(tok::semi);
604    return 0;
605  }
606
607  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
608    return 0;
609
610  if (Tok.isNot(tok::string_literal)) {
611    Diag(Tok, diag::err_expected_string_literal);
612    SkipUntil(tok::semi);
613    return 0;
614  }
615
616  ExprResult AssertMessage(ParseStringLiteralExpression());
617  if (AssertMessage.isInvalid())
618    return 0;
619
620  T.consumeClose();
621
622  DeclEnd = Tok.getLocation();
623  ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
624
625  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
626                                              AssertExpr.take(),
627                                              AssertMessage.take(),
628                                              T.getCloseLocation());
629}
630
631/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
632///
633/// 'decltype' ( expression )
634///
635void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
636  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
637
638  SourceLocation StartLoc = ConsumeToken();
639  BalancedDelimiterTracker T(*this, tok::l_paren);
640  if (T.expectAndConsume(diag::err_expected_lparen_after,
641                       "decltype", tok::r_paren)) {
642    return;
643  }
644
645  // Parse the expression
646
647  // C++0x [dcl.type.simple]p4:
648  //   The operand of the decltype specifier is an unevaluated operand.
649  EnterExpressionEvaluationContext Unevaluated(Actions,
650                                               Sema::Unevaluated);
651  ExprResult Result = ParseExpression();
652  if (Result.isInvalid()) {
653    SkipUntil(tok::r_paren);
654    return;
655  }
656
657  // Match the ')'
658  T.consumeClose();
659  if (T.getCloseLocation().isInvalid())
660    return;
661
662  const char *PrevSpec = 0;
663  unsigned DiagID;
664  // Check for duplicate type specifiers (e.g. "int decltype(a)").
665  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
666                         DiagID, Result.release()))
667    Diag(StartLoc, DiagID) << PrevSpec;
668}
669
670void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
671  assert(Tok.is(tok::kw___underlying_type) &&
672         "Not an underlying type specifier");
673
674  SourceLocation StartLoc = ConsumeToken();
675  BalancedDelimiterTracker T(*this, tok::l_paren);
676  if (T.expectAndConsume(diag::err_expected_lparen_after,
677                       "__underlying_type", tok::r_paren)) {
678    return;
679  }
680
681  TypeResult Result = ParseTypeName();
682  if (Result.isInvalid()) {
683    SkipUntil(tok::r_paren);
684    return;
685  }
686
687  // Match the ')'
688  T.consumeClose();
689  if (T.getCloseLocation().isInvalid())
690    return;
691
692  const char *PrevSpec = 0;
693  unsigned DiagID;
694  if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
695                         DiagID, Result.release()))
696    Diag(StartLoc, DiagID) << PrevSpec;
697}
698
699/// ParseClassName - Parse a C++ class-name, which names a class. Note
700/// that we only check that the result names a type; semantic analysis
701/// will need to verify that the type names a class. The result is
702/// either a type or NULL, depending on whether a type name was
703/// found.
704///
705///       class-name: [C++ 9.1]
706///         identifier
707///         simple-template-id
708///
709Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
710                                          CXXScopeSpec &SS) {
711  // Check whether we have a template-id that names a type.
712  if (Tok.is(tok::annot_template_id)) {
713    TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
714    if (TemplateId->Kind == TNK_Type_template ||
715        TemplateId->Kind == TNK_Dependent_template_name) {
716      AnnotateTemplateIdTokenAsType();
717
718      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
719      ParsedType Type = getTypeAnnotation(Tok);
720      EndLocation = Tok.getAnnotationEndLoc();
721      ConsumeToken();
722
723      if (Type)
724        return Type;
725      return true;
726    }
727
728    // Fall through to produce an error below.
729  }
730
731  if (Tok.isNot(tok::identifier)) {
732    Diag(Tok, diag::err_expected_class_name);
733    return true;
734  }
735
736  IdentifierInfo *Id = Tok.getIdentifierInfo();
737  SourceLocation IdLoc = ConsumeToken();
738
739  if (Tok.is(tok::less)) {
740    // It looks the user intended to write a template-id here, but the
741    // template-name was wrong. Try to fix that.
742    TemplateNameKind TNK = TNK_Type_template;
743    TemplateTy Template;
744    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
745                                             &SS, Template, TNK)) {
746      Diag(IdLoc, diag::err_unknown_template_name)
747        << Id;
748    }
749
750    if (!Template)
751      return true;
752
753    // Form the template name
754    UnqualifiedId TemplateName;
755    TemplateName.setIdentifier(Id, IdLoc);
756
757    // Parse the full template-id, then turn it into a type.
758    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
759                                SourceLocation(), true))
760      return true;
761    if (TNK == TNK_Dependent_template_name)
762      AnnotateTemplateIdTokenAsType();
763
764    // If we didn't end up with a typename token, there's nothing more we
765    // can do.
766    if (Tok.isNot(tok::annot_typename))
767      return true;
768
769    // Retrieve the type from the annotation token, consume that token, and
770    // return.
771    EndLocation = Tok.getAnnotationEndLoc();
772    ParsedType Type = getTypeAnnotation(Tok);
773    ConsumeToken();
774    return Type;
775  }
776
777  // We have an identifier; check whether it is actually a type.
778  ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
779                                        false, ParsedType(),
780                                        /*NonTrivialTypeSourceInfo=*/true);
781  if (!Type) {
782    Diag(IdLoc, diag::err_expected_class_name);
783    return true;
784  }
785
786  // Consume the identifier.
787  EndLocation = IdLoc;
788
789  // Fake up a Declarator to use with ActOnTypeName.
790  DeclSpec DS(AttrFactory);
791  DS.SetRangeStart(IdLoc);
792  DS.SetRangeEnd(EndLocation);
793  DS.getTypeSpecScope() = SS;
794
795  const char *PrevSpec = 0;
796  unsigned DiagID;
797  DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
798
799  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
800  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
801}
802
803/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
804/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
805/// until we reach the start of a definition or see a token that
806/// cannot start a definition. If SuppressDeclarations is true, we do know.
807///
808///       class-specifier: [C++ class]
809///         class-head '{' member-specification[opt] '}'
810///         class-head '{' member-specification[opt] '}' attributes[opt]
811///       class-head:
812///         class-key identifier[opt] base-clause[opt]
813///         class-key nested-name-specifier identifier base-clause[opt]
814///         class-key nested-name-specifier[opt] simple-template-id
815///                          base-clause[opt]
816/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
817/// [GNU]   class-key attributes[opt] nested-name-specifier
818///                          identifier base-clause[opt]
819/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
820///                          simple-template-id base-clause[opt]
821///       class-key:
822///         'class'
823///         'struct'
824///         'union'
825///
826///       elaborated-type-specifier: [C++ dcl.type.elab]
827///         class-key ::[opt] nested-name-specifier[opt] identifier
828///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
829///                          simple-template-id
830///
831///  Note that the C++ class-specifier and elaborated-type-specifier,
832///  together, subsume the C99 struct-or-union-specifier:
833///
834///       struct-or-union-specifier: [C99 6.7.2.1]
835///         struct-or-union identifier[opt] '{' struct-contents '}'
836///         struct-or-union identifier
837/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
838///                                                         '}' attributes[opt]
839/// [GNU]   struct-or-union attributes[opt] identifier
840///       struct-or-union:
841///         'struct'
842///         'union'
843void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
844                                 SourceLocation StartLoc, DeclSpec &DS,
845                                 const ParsedTemplateInfo &TemplateInfo,
846                                 AccessSpecifier AS, bool SuppressDeclarations){
847  DeclSpec::TST TagType;
848  if (TagTokKind == tok::kw_struct)
849    TagType = DeclSpec::TST_struct;
850  else if (TagTokKind == tok::kw_class)
851    TagType = DeclSpec::TST_class;
852  else {
853    assert(TagTokKind == tok::kw_union && "Not a class specifier");
854    TagType = DeclSpec::TST_union;
855  }
856
857  if (Tok.is(tok::code_completion)) {
858    // Code completion for a struct, class, or union name.
859    Actions.CodeCompleteTag(getCurScope(), TagType);
860    return cutOffParsing();
861  }
862
863  // C++03 [temp.explicit] 14.7.2/8:
864  //   The usual access checking rules do not apply to names used to specify
865  //   explicit instantiations.
866  //
867  // As an extension we do not perform access checking on the names used to
868  // specify explicit specializations either. This is important to allow
869  // specializing traits classes for private types.
870  bool SuppressingAccessChecks = false;
871  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
872      TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) {
873    Actions.ActOnStartSuppressingAccessChecks();
874    SuppressingAccessChecks = true;
875  }
876
877  ParsedAttributes attrs(AttrFactory);
878  // If attributes exist after tag, parse them.
879  if (Tok.is(tok::kw___attribute))
880    ParseGNUAttributes(attrs);
881
882  // If declspecs exist after tag, parse them.
883  while (Tok.is(tok::kw___declspec))
884    ParseMicrosoftDeclSpec(attrs);
885
886  // If C++0x attributes exist here, parse them.
887  // FIXME: Are we consistent with the ordering of parsing of different
888  // styles of attributes?
889  MaybeParseCXX0XAttributes(attrs);
890
891  if (TagType == DeclSpec::TST_struct &&
892      !Tok.is(tok::identifier) &&
893      Tok.getIdentifierInfo() &&
894      (Tok.is(tok::kw___is_arithmetic) ||
895       Tok.is(tok::kw___is_convertible) ||
896       Tok.is(tok::kw___is_empty) ||
897       Tok.is(tok::kw___is_floating_point) ||
898       Tok.is(tok::kw___is_function) ||
899       Tok.is(tok::kw___is_fundamental) ||
900       Tok.is(tok::kw___is_integral) ||
901       Tok.is(tok::kw___is_member_function_pointer) ||
902       Tok.is(tok::kw___is_member_pointer) ||
903       Tok.is(tok::kw___is_pod) ||
904       Tok.is(tok::kw___is_pointer) ||
905       Tok.is(tok::kw___is_same) ||
906       Tok.is(tok::kw___is_scalar) ||
907       Tok.is(tok::kw___is_signed) ||
908       Tok.is(tok::kw___is_unsigned) ||
909       Tok.is(tok::kw___is_void))) {
910    // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
911    // name of struct templates, but some are keywords in GCC >= 4.3
912    // and Clang. Therefore, when we see the token sequence "struct
913    // X", make X into a normal identifier rather than a keyword, to
914    // allow libstdc++ 4.2 and libc++ to work properly.
915    Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
916    Tok.setKind(tok::identifier);
917  }
918
919  // Parse the (optional) nested-name-specifier.
920  CXXScopeSpec &SS = DS.getTypeSpecScope();
921  if (getLang().CPlusPlus) {
922    // "FOO : BAR" is not a potential typo for "FOO::BAR".
923    ColonProtectionRAIIObject X(*this);
924
925    if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true))
926      DS.SetTypeSpecError();
927    if (SS.isSet())
928      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
929        Diag(Tok, diag::err_expected_ident);
930  }
931
932  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
933
934  // Parse the (optional) class name or simple-template-id.
935  IdentifierInfo *Name = 0;
936  SourceLocation NameLoc;
937  TemplateIdAnnotation *TemplateId = 0;
938  if (Tok.is(tok::identifier)) {
939    Name = Tok.getIdentifierInfo();
940    NameLoc = ConsumeToken();
941
942    if (Tok.is(tok::less) && getLang().CPlusPlus) {
943      // The name was supposed to refer to a template, but didn't.
944      // Eat the template argument list and try to continue parsing this as
945      // a class (or template thereof).
946      TemplateArgList TemplateArgs;
947      SourceLocation LAngleLoc, RAngleLoc;
948      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
949                                           true, LAngleLoc,
950                                           TemplateArgs, RAngleLoc)) {
951        // We couldn't parse the template argument list at all, so don't
952        // try to give any location information for the list.
953        LAngleLoc = RAngleLoc = SourceLocation();
954      }
955
956      Diag(NameLoc, diag::err_explicit_spec_non_template)
957        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
958        << (TagType == DeclSpec::TST_class? 0
959            : TagType == DeclSpec::TST_struct? 1
960            : 2)
961        << Name
962        << SourceRange(LAngleLoc, RAngleLoc);
963
964      // Strip off the last template parameter list if it was empty, since
965      // we've removed its template argument list.
966      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
967        if (TemplateParams && TemplateParams->size() > 1) {
968          TemplateParams->pop_back();
969        } else {
970          TemplateParams = 0;
971          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
972            = ParsedTemplateInfo::NonTemplate;
973        }
974      } else if (TemplateInfo.Kind
975                                == ParsedTemplateInfo::ExplicitInstantiation) {
976        // Pretend this is just a forward declaration.
977        TemplateParams = 0;
978        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
979          = ParsedTemplateInfo::NonTemplate;
980        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
981          = SourceLocation();
982        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
983          = SourceLocation();
984      }
985    }
986  } else if (Tok.is(tok::annot_template_id)) {
987    TemplateId = takeTemplateIdAnnotation(Tok);
988    NameLoc = ConsumeToken();
989
990    if (TemplateId->Kind != TNK_Type_template &&
991        TemplateId->Kind != TNK_Dependent_template_name) {
992      // The template-name in the simple-template-id refers to
993      // something other than a class template. Give an appropriate
994      // error message and skip to the ';'.
995      SourceRange Range(NameLoc);
996      if (SS.isNotEmpty())
997        Range.setBegin(SS.getBeginLoc());
998
999      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1000        << Name << static_cast<int>(TemplateId->Kind) << Range;
1001
1002      DS.SetTypeSpecError();
1003      SkipUntil(tok::semi, false, true);
1004      if (SuppressingAccessChecks)
1005        Actions.ActOnStopSuppressingAccessChecks();
1006
1007      return;
1008    }
1009  }
1010
1011  // As soon as we're finished parsing the class's template-id, turn access
1012  // checking back on.
1013  if (SuppressingAccessChecks)
1014    Actions.ActOnStopSuppressingAccessChecks();
1015
1016  // There are four options here.  If we have 'struct foo;', then this
1017  // is either a forward declaration or a friend declaration, which
1018  // have to be treated differently.  If we have 'struct foo {...',
1019  // 'struct foo :...' or 'struct foo final[opt]' then this is a
1020  // definition. Otherwise we have something like 'struct foo xyz', a reference.
1021  // However, in some contexts, things look like declarations but are just
1022  // references, e.g.
1023  // new struct s;
1024  // or
1025  // &T::operator struct s;
1026  // For these, SuppressDeclarations is true.
1027  Sema::TagUseKind TUK;
1028  if (SuppressDeclarations)
1029    TUK = Sema::TUK_Reference;
1030  else if (Tok.is(tok::l_brace) ||
1031           (getLang().CPlusPlus && Tok.is(tok::colon)) ||
1032           isCXX0XFinalKeyword()) {
1033    if (DS.isFriendSpecified()) {
1034      // C++ [class.friend]p2:
1035      //   A class shall not be defined in a friend declaration.
1036      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
1037        << SourceRange(DS.getFriendSpecLoc());
1038
1039      // Skip everything up to the semicolon, so that this looks like a proper
1040      // friend class (or template thereof) declaration.
1041      SkipUntil(tok::semi, true, true);
1042      TUK = Sema::TUK_Friend;
1043    } else {
1044      // Okay, this is a class definition.
1045      TUK = Sema::TUK_Definition;
1046    }
1047  } else if (Tok.is(tok::semi))
1048    TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1049  else
1050    TUK = Sema::TUK_Reference;
1051
1052  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1053                               TUK != Sema::TUK_Definition)) {
1054    if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1055      // We have a declaration or reference to an anonymous class.
1056      Diag(StartLoc, diag::err_anon_type_definition)
1057        << DeclSpec::getSpecifierName(TagType);
1058    }
1059
1060    SkipUntil(tok::comma, true);
1061    return;
1062  }
1063
1064  // Create the tag portion of the class or class template.
1065  DeclResult TagOrTempResult = true; // invalid
1066  TypeResult TypeResult = true; // invalid
1067
1068  bool Owned = false;
1069  if (TemplateId) {
1070    // Explicit specialization, class template partial specialization,
1071    // or explicit instantiation.
1072    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
1073                                       TemplateId->getTemplateArgs(),
1074                                       TemplateId->NumArgs);
1075    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1076        TUK == Sema::TUK_Declaration) {
1077      // This is an explicit instantiation of a class template.
1078      TagOrTempResult
1079        = Actions.ActOnExplicitInstantiation(getCurScope(),
1080                                             TemplateInfo.ExternLoc,
1081                                             TemplateInfo.TemplateLoc,
1082                                             TagType,
1083                                             StartLoc,
1084                                             SS,
1085                                             TemplateId->Template,
1086                                             TemplateId->TemplateNameLoc,
1087                                             TemplateId->LAngleLoc,
1088                                             TemplateArgsPtr,
1089                                             TemplateId->RAngleLoc,
1090                                             attrs.getList());
1091
1092    // Friend template-ids are treated as references unless
1093    // they have template headers, in which case they're ill-formed
1094    // (FIXME: "template <class T> friend class A<T>::B<int>;").
1095    // We diagnose this error in ActOnClassTemplateSpecialization.
1096    } else if (TUK == Sema::TUK_Reference ||
1097               (TUK == Sema::TUK_Friend &&
1098                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1099      TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType,
1100                                                  StartLoc,
1101                                                  TemplateId->SS,
1102                                                  TemplateId->Template,
1103                                                  TemplateId->TemplateNameLoc,
1104                                                  TemplateId->LAngleLoc,
1105                                                  TemplateArgsPtr,
1106                                                  TemplateId->RAngleLoc);
1107    } else {
1108      // This is an explicit specialization or a class template
1109      // partial specialization.
1110      TemplateParameterLists FakedParamLists;
1111
1112      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1113        // This looks like an explicit instantiation, because we have
1114        // something like
1115        //
1116        //   template class Foo<X>
1117        //
1118        // but it actually has a definition. Most likely, this was
1119        // meant to be an explicit specialization, but the user forgot
1120        // the '<>' after 'template'.
1121        assert(TUK == Sema::TUK_Definition && "Expected a definition here");
1122
1123        SourceLocation LAngleLoc
1124          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1125        Diag(TemplateId->TemplateNameLoc,
1126             diag::err_explicit_instantiation_with_definition)
1127          << SourceRange(TemplateInfo.TemplateLoc)
1128          << FixItHint::CreateInsertion(LAngleLoc, "<>");
1129
1130        // Create a fake template parameter list that contains only
1131        // "template<>", so that we treat this construct as a class
1132        // template specialization.
1133        FakedParamLists.push_back(
1134          Actions.ActOnTemplateParameterList(0, SourceLocation(),
1135                                             TemplateInfo.TemplateLoc,
1136                                             LAngleLoc,
1137                                             0, 0,
1138                                             LAngleLoc));
1139        TemplateParams = &FakedParamLists;
1140      }
1141
1142      // Build the class template specialization.
1143      TagOrTempResult
1144        = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
1145                       StartLoc, DS.getModulePrivateSpecLoc(), SS,
1146                       TemplateId->Template,
1147                       TemplateId->TemplateNameLoc,
1148                       TemplateId->LAngleLoc,
1149                       TemplateArgsPtr,
1150                       TemplateId->RAngleLoc,
1151                       attrs.getList(),
1152                       MultiTemplateParamsArg(Actions,
1153                                    TemplateParams? &(*TemplateParams)[0] : 0,
1154                                 TemplateParams? TemplateParams->size() : 0));
1155    }
1156  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1157             TUK == Sema::TUK_Declaration) {
1158    // Explicit instantiation of a member of a class template
1159    // specialization, e.g.,
1160    //
1161    //   template struct Outer<int>::Inner;
1162    //
1163    TagOrTempResult
1164      = Actions.ActOnExplicitInstantiation(getCurScope(),
1165                                           TemplateInfo.ExternLoc,
1166                                           TemplateInfo.TemplateLoc,
1167                                           TagType, StartLoc, SS, Name,
1168                                           NameLoc, attrs.getList());
1169  } else if (TUK == Sema::TUK_Friend &&
1170             TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1171    TagOrTempResult =
1172      Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1173                                      TagType, StartLoc, SS,
1174                                      Name, NameLoc, attrs.getList(),
1175                                      MultiTemplateParamsArg(Actions,
1176                                    TemplateParams? &(*TemplateParams)[0] : 0,
1177                                 TemplateParams? TemplateParams->size() : 0));
1178  } else {
1179    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1180        TUK == Sema::TUK_Definition) {
1181      // FIXME: Diagnose this particular error.
1182    }
1183
1184    bool IsDependent = false;
1185
1186    // Don't pass down template parameter lists if this is just a tag
1187    // reference.  For example, we don't need the template parameters here:
1188    //   template <class T> class A *makeA(T t);
1189    MultiTemplateParamsArg TParams;
1190    if (TUK != Sema::TUK_Reference && TemplateParams)
1191      TParams =
1192        MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1193
1194    // Declaration or definition of a class type
1195    TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1196                                       SS, Name, NameLoc, attrs.getList(), AS,
1197                                       DS.getModulePrivateSpecLoc(),
1198                                       TParams, Owned, IsDependent, false,
1199                                       false, clang::TypeResult());
1200
1201    // If ActOnTag said the type was dependent, try again with the
1202    // less common call.
1203    if (IsDependent) {
1204      assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1205      TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1206                                             SS, Name, StartLoc, NameLoc);
1207    }
1208  }
1209
1210  // If there is a body, parse it and inform the actions module.
1211  if (TUK == Sema::TUK_Definition) {
1212    assert(Tok.is(tok::l_brace) ||
1213           (getLang().CPlusPlus && Tok.is(tok::colon)) ||
1214           isCXX0XFinalKeyword());
1215    if (getLang().CPlusPlus)
1216      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
1217    else
1218      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1219  }
1220
1221  const char *PrevSpec = 0;
1222  unsigned DiagID;
1223  bool Result;
1224  if (!TypeResult.isInvalid()) {
1225    Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1226                                NameLoc.isValid() ? NameLoc : StartLoc,
1227                                PrevSpec, DiagID, TypeResult.get());
1228  } else if (!TagOrTempResult.isInvalid()) {
1229    Result = DS.SetTypeSpecType(TagType, StartLoc,
1230                                NameLoc.isValid() ? NameLoc : StartLoc,
1231                                PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1232  } else {
1233    DS.SetTypeSpecError();
1234    return;
1235  }
1236
1237  if (Result)
1238    Diag(StartLoc, DiagID) << PrevSpec;
1239
1240  // At this point, we've successfully parsed a class-specifier in 'definition'
1241  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
1242  // going to look at what comes after it to improve error recovery.  If an
1243  // impossible token occurs next, we assume that the programmer forgot a ; at
1244  // the end of the declaration and recover that way.
1245  //
1246  // This switch enumerates the valid "follow" set for definition.
1247  if (TUK == Sema::TUK_Definition) {
1248    bool ExpectedSemi = true;
1249    switch (Tok.getKind()) {
1250    default: break;
1251    case tok::semi:               // struct foo {...} ;
1252    case tok::star:               // struct foo {...} *         P;
1253    case tok::amp:                // struct foo {...} &         R = ...
1254    case tok::identifier:         // struct foo {...} V         ;
1255    case tok::r_paren:            //(struct foo {...} )         {4}
1256    case tok::annot_cxxscope:     // struct foo {...} a::       b;
1257    case tok::annot_typename:     // struct foo {...} a         ::b;
1258    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
1259    case tok::l_paren:            // struct foo {...} (         x);
1260    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
1261      ExpectedSemi = false;
1262      break;
1263    // Type qualifiers
1264    case tok::kw_const:           // struct foo {...} const     x;
1265    case tok::kw_volatile:        // struct foo {...} volatile  x;
1266    case tok::kw_restrict:        // struct foo {...} restrict  x;
1267    case tok::kw_inline:          // struct foo {...} inline    foo() {};
1268    // Storage-class specifiers
1269    case tok::kw_static:          // struct foo {...} static    x;
1270    case tok::kw_extern:          // struct foo {...} extern    x;
1271    case tok::kw_typedef:         // struct foo {...} typedef   x;
1272    case tok::kw_register:        // struct foo {...} register  x;
1273    case tok::kw_auto:            // struct foo {...} auto      x;
1274    case tok::kw_mutable:         // struct foo {...} mutable   x;
1275    case tok::kw_constexpr:       // struct foo {...} constexpr x;
1276      // As shown above, type qualifiers and storage class specifiers absolutely
1277      // can occur after class specifiers according to the grammar.  However,
1278      // almost no one actually writes code like this.  If we see one of these,
1279      // it is much more likely that someone missed a semi colon and the
1280      // type/storage class specifier we're seeing is part of the *next*
1281      // intended declaration, as in:
1282      //
1283      //   struct foo { ... }
1284      //   typedef int X;
1285      //
1286      // We'd really like to emit a missing semicolon error instead of emitting
1287      // an error on the 'int' saying that you can't have two type specifiers in
1288      // the same declaration of X.  Because of this, we look ahead past this
1289      // token to see if it's a type specifier.  If so, we know the code is
1290      // otherwise invalid, so we can produce the expected semi error.
1291      if (!isKnownToBeTypeSpecifier(NextToken()))
1292        ExpectedSemi = false;
1293      break;
1294
1295    case tok::r_brace:  // struct bar { struct foo {...} }
1296      // Missing ';' at end of struct is accepted as an extension in C mode.
1297      if (!getLang().CPlusPlus)
1298        ExpectedSemi = false;
1299      break;
1300    }
1301
1302    // C++ [temp]p3 In a template-declaration which defines a class, no
1303    // declarator is permitted.
1304    if (TemplateInfo.Kind)
1305      ExpectedSemi = true;
1306
1307    if (ExpectedSemi) {
1308      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1309                       TagType == DeclSpec::TST_class ? "class"
1310                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1311      // Push this token back into the preprocessor and change our current token
1312      // to ';' so that the rest of the code recovers as though there were an
1313      // ';' after the definition.
1314      PP.EnterToken(Tok);
1315      Tok.setKind(tok::semi);
1316    }
1317  }
1318}
1319
1320/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1321///
1322///       base-clause : [C++ class.derived]
1323///         ':' base-specifier-list
1324///       base-specifier-list:
1325///         base-specifier '...'[opt]
1326///         base-specifier-list ',' base-specifier '...'[opt]
1327void Parser::ParseBaseClause(Decl *ClassDecl) {
1328  assert(Tok.is(tok::colon) && "Not a base clause");
1329  ConsumeToken();
1330
1331  // Build up an array of parsed base specifiers.
1332  SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1333
1334  while (true) {
1335    // Parse a base-specifier.
1336    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1337    if (Result.isInvalid()) {
1338      // Skip the rest of this base specifier, up until the comma or
1339      // opening brace.
1340      SkipUntil(tok::comma, tok::l_brace, true, true);
1341    } else {
1342      // Add this to our array of base specifiers.
1343      BaseInfo.push_back(Result.get());
1344    }
1345
1346    // If the next token is a comma, consume it and keep reading
1347    // base-specifiers.
1348    if (Tok.isNot(tok::comma)) break;
1349
1350    // Consume the comma.
1351    ConsumeToken();
1352  }
1353
1354  // Attach the base specifiers
1355  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1356}
1357
1358/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1359/// one entry in the base class list of a class specifier, for example:
1360///    class foo : public bar, virtual private baz {
1361/// 'public bar' and 'virtual private baz' are each base-specifiers.
1362///
1363///       base-specifier: [C++ class.derived]
1364///         ::[opt] nested-name-specifier[opt] class-name
1365///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1366///                        class-name
1367///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1368///                        class-name
1369Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1370  bool IsVirtual = false;
1371  SourceLocation StartLoc = Tok.getLocation();
1372
1373  // Parse the 'virtual' keyword.
1374  if (Tok.is(tok::kw_virtual))  {
1375    ConsumeToken();
1376    IsVirtual = true;
1377  }
1378
1379  // Parse an (optional) access specifier.
1380  AccessSpecifier Access = getAccessSpecifierIfPresent();
1381  if (Access != AS_none)
1382    ConsumeToken();
1383
1384  // Parse the 'virtual' keyword (again!), in case it came after the
1385  // access specifier.
1386  if (Tok.is(tok::kw_virtual))  {
1387    SourceLocation VirtualLoc = ConsumeToken();
1388    if (IsVirtual) {
1389      // Complain about duplicate 'virtual'
1390      Diag(VirtualLoc, diag::err_dup_virtual)
1391        << FixItHint::CreateRemoval(VirtualLoc);
1392    }
1393
1394    IsVirtual = true;
1395  }
1396
1397  // Parse optional '::' and optional nested-name-specifier.
1398  CXXScopeSpec SS;
1399  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
1400
1401  // The location of the base class itself.
1402  SourceLocation BaseLoc = Tok.getLocation();
1403
1404  // Parse the class-name.
1405  SourceLocation EndLocation;
1406  TypeResult BaseType = ParseClassName(EndLocation, SS);
1407  if (BaseType.isInvalid())
1408    return true;
1409
1410  // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1411  // actually part of the base-specifier-list grammar productions, but we
1412  // parse it here for convenience.
1413  SourceLocation EllipsisLoc;
1414  if (Tok.is(tok::ellipsis))
1415    EllipsisLoc = ConsumeToken();
1416
1417  // Find the complete source range for the base-specifier.
1418  SourceRange Range(StartLoc, EndLocation);
1419
1420  // Notify semantic analysis that we have parsed a complete
1421  // base-specifier.
1422  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1423                                    BaseType.get(), BaseLoc, EllipsisLoc);
1424}
1425
1426/// getAccessSpecifierIfPresent - Determine whether the next token is
1427/// a C++ access-specifier.
1428///
1429///       access-specifier: [C++ class.derived]
1430///         'private'
1431///         'protected'
1432///         'public'
1433AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1434  switch (Tok.getKind()) {
1435  default: return AS_none;
1436  case tok::kw_private: return AS_private;
1437  case tok::kw_protected: return AS_protected;
1438  case tok::kw_public: return AS_public;
1439  }
1440}
1441
1442void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1443                                             Decl *ThisDecl) {
1444  // We just declared a member function. If this member function
1445  // has any default arguments, we'll need to parse them later.
1446  LateParsedMethodDeclaration *LateMethod = 0;
1447  DeclaratorChunk::FunctionTypeInfo &FTI
1448    = DeclaratorInfo.getFunctionTypeInfo();
1449  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1450    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1451      if (!LateMethod) {
1452        // Push this method onto the stack of late-parsed method
1453        // declarations.
1454        LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1455        getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1456        LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1457
1458        // Add all of the parameters prior to this one (they don't
1459        // have default arguments).
1460        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1461        for (unsigned I = 0; I < ParamIdx; ++I)
1462          LateMethod->DefaultArgs.push_back(
1463                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1464      }
1465
1466      // Add this parameter to the list of parameters (it or may
1467      // not have a default argument).
1468      LateMethod->DefaultArgs.push_back(
1469        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1470                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1471    }
1472  }
1473}
1474
1475/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x
1476/// virt-specifier.
1477///
1478///       virt-specifier:
1479///         override
1480///         final
1481VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const {
1482  if (!getLang().CPlusPlus)
1483    return VirtSpecifiers::VS_None;
1484
1485  if (Tok.is(tok::identifier)) {
1486    IdentifierInfo *II = Tok.getIdentifierInfo();
1487
1488    // Initialize the contextual keywords.
1489    if (!Ident_final) {
1490      Ident_final = &PP.getIdentifierTable().get("final");
1491      Ident_override = &PP.getIdentifierTable().get("override");
1492    }
1493
1494    if (II == Ident_override)
1495      return VirtSpecifiers::VS_Override;
1496
1497    if (II == Ident_final)
1498      return VirtSpecifiers::VS_Final;
1499  }
1500
1501  return VirtSpecifiers::VS_None;
1502}
1503
1504/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq.
1505///
1506///       virt-specifier-seq:
1507///         virt-specifier
1508///         virt-specifier-seq virt-specifier
1509void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) {
1510  while (true) {
1511    VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier();
1512    if (Specifier == VirtSpecifiers::VS_None)
1513      return;
1514
1515    // C++ [class.mem]p8:
1516    //   A virt-specifier-seq shall contain at most one of each virt-specifier.
1517    const char *PrevSpec = 0;
1518    if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1519      Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1520        << PrevSpec
1521        << FixItHint::CreateRemoval(Tok.getLocation());
1522
1523    Diag(Tok.getLocation(), getLang().CPlusPlus0x ?
1524         diag::warn_cxx98_compat_override_control_keyword :
1525         diag::ext_override_control_keyword)
1526      << VirtSpecifiers::getSpecifierName(Specifier);
1527    ConsumeToken();
1528  }
1529}
1530
1531/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x
1532/// contextual 'final' keyword.
1533bool Parser::isCXX0XFinalKeyword() const {
1534  if (!getLang().CPlusPlus)
1535    return false;
1536
1537  if (!Tok.is(tok::identifier))
1538    return false;
1539
1540  // Initialize the contextual keywords.
1541  if (!Ident_final) {
1542    Ident_final = &PP.getIdentifierTable().get("final");
1543    Ident_override = &PP.getIdentifierTable().get("override");
1544  }
1545
1546  return Tok.getIdentifierInfo() == Ident_final;
1547}
1548
1549/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1550///
1551///       member-declaration:
1552///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1553///         function-definition ';'[opt]
1554///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1555///         using-declaration                                            [TODO]
1556/// [C++0x] static_assert-declaration
1557///         template-declaration
1558/// [GNU]   '__extension__' member-declaration
1559///
1560///       member-declarator-list:
1561///         member-declarator
1562///         member-declarator-list ',' member-declarator
1563///
1564///       member-declarator:
1565///         declarator virt-specifier-seq[opt] pure-specifier[opt]
1566///         declarator constant-initializer[opt]
1567/// [C++11] declarator brace-or-equal-initializer[opt]
1568///         identifier[opt] ':' constant-expression
1569///
1570///       virt-specifier-seq:
1571///         virt-specifier
1572///         virt-specifier-seq virt-specifier
1573///
1574///       virt-specifier:
1575///         override
1576///         final
1577///
1578///       pure-specifier:
1579///         '= 0'
1580///
1581///       constant-initializer:
1582///         '=' constant-expression
1583///
1584void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1585                                            AttributeList *AccessAttrs,
1586                                       const ParsedTemplateInfo &TemplateInfo,
1587                                       ParsingDeclRAIIObject *TemplateDiags) {
1588  if (Tok.is(tok::at)) {
1589    if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1590      Diag(Tok, diag::err_at_defs_cxx);
1591    else
1592      Diag(Tok, diag::err_at_in_class);
1593
1594    ConsumeToken();
1595    SkipUntil(tok::r_brace);
1596    return;
1597  }
1598
1599  // Access declarations.
1600  if (!TemplateInfo.Kind &&
1601      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1602      !TryAnnotateCXXScopeToken() &&
1603      Tok.is(tok::annot_cxxscope)) {
1604    bool isAccessDecl = false;
1605    if (NextToken().is(tok::identifier))
1606      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1607    else
1608      isAccessDecl = NextToken().is(tok::kw_operator);
1609
1610    if (isAccessDecl) {
1611      // Collect the scope specifier token we annotated earlier.
1612      CXXScopeSpec SS;
1613      ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1614
1615      // Try to parse an unqualified-id.
1616      UnqualifiedId Name;
1617      if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) {
1618        SkipUntil(tok::semi);
1619        return;
1620      }
1621
1622      // TODO: recover from mistakenly-qualified operator declarations.
1623      if (ExpectAndConsume(tok::semi,
1624                           diag::err_expected_semi_after,
1625                           "access declaration",
1626                           tok::semi))
1627        return;
1628
1629      Actions.ActOnUsingDeclaration(getCurScope(), AS,
1630                                    false, SourceLocation(),
1631                                    SS, Name,
1632                                    /* AttrList */ 0,
1633                                    /* IsTypeName */ false,
1634                                    SourceLocation());
1635      return;
1636    }
1637  }
1638
1639  // static_assert-declaration
1640  if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1641    // FIXME: Check for templates
1642    SourceLocation DeclEnd;
1643    ParseStaticAssertDeclaration(DeclEnd);
1644    return;
1645  }
1646
1647  if (Tok.is(tok::kw_template)) {
1648    assert(!TemplateInfo.TemplateParams &&
1649           "Nested template improperly parsed?");
1650    SourceLocation DeclEnd;
1651    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1652                                         AS, AccessAttrs);
1653    return;
1654  }
1655
1656  // Handle:  member-declaration ::= '__extension__' member-declaration
1657  if (Tok.is(tok::kw___extension__)) {
1658    // __extension__ silences extension warnings in the subexpression.
1659    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1660    ConsumeToken();
1661    return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
1662                                          TemplateInfo, TemplateDiags);
1663  }
1664
1665  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1666  // is a bitfield.
1667  ColonProtectionRAIIObject X(*this);
1668
1669  ParsedAttributesWithRange attrs(AttrFactory);
1670  // Optional C++0x attribute-specifier
1671  MaybeParseCXX0XAttributes(attrs);
1672  MaybeParseMicrosoftAttributes(attrs);
1673
1674  if (Tok.is(tok::kw_using)) {
1675    ProhibitAttributes(attrs);
1676
1677    // Eat 'using'.
1678    SourceLocation UsingLoc = ConsumeToken();
1679
1680    if (Tok.is(tok::kw_namespace)) {
1681      Diag(UsingLoc, diag::err_using_namespace_in_class);
1682      SkipUntil(tok::semi, true, true);
1683    } else {
1684      SourceLocation DeclEnd;
1685      // Otherwise, it must be a using-declaration or an alias-declaration.
1686      ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
1687                            UsingLoc, DeclEnd, AS);
1688    }
1689    return;
1690  }
1691
1692  // decl-specifier-seq:
1693  // Parse the common declaration-specifiers piece.
1694  ParsingDeclSpec DS(*this, TemplateDiags);
1695  DS.takeAttributesFrom(attrs);
1696  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1697
1698  MultiTemplateParamsArg TemplateParams(Actions,
1699      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1700      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1701
1702  if (Tok.is(tok::semi)) {
1703    ConsumeToken();
1704    Decl *TheDecl =
1705      Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
1706    DS.complete(TheDecl);
1707    return;
1708  }
1709
1710  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1711  VirtSpecifiers VS;
1712
1713  // Hold late-parsed attributes so we can attach a Decl to them later.
1714  LateParsedAttrList LateParsedAttrs;
1715
1716  SourceLocation EqualLoc;
1717  bool HasInitializer = false;
1718  ExprResult Init;
1719  if (Tok.isNot(tok::colon)) {
1720    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1721    ColonProtectionRAIIObject X(*this);
1722
1723    // Parse the first declarator.
1724    ParseDeclarator(DeclaratorInfo);
1725    // Error parsing the declarator?
1726    if (!DeclaratorInfo.hasName()) {
1727      // If so, skip until the semi-colon or a }.
1728      SkipUntil(tok::r_brace, true, true);
1729      if (Tok.is(tok::semi))
1730        ConsumeToken();
1731      return;
1732    }
1733
1734    ParseOptionalCXX0XVirtSpecifierSeq(VS);
1735
1736    // If attributes exist after the declarator, but before an '{', parse them.
1737    MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
1738
1739    // MSVC permits pure specifier on inline functions declared at class scope.
1740    // Hence check for =0 before checking for function definition.
1741    if (getLang().MicrosoftExt && Tok.is(tok::equal) &&
1742        DeclaratorInfo.isFunctionDeclarator() &&
1743        NextToken().is(tok::numeric_constant)) {
1744      EqualLoc = ConsumeToken();
1745      Init = ParseInitializer();
1746      if (Init.isInvalid())
1747        SkipUntil(tok::comma, true, true);
1748      else
1749        HasInitializer = true;
1750    }
1751
1752    bool IsDefinition = false;
1753    // function-definition:
1754    //
1755    // In C++11, a non-function declarator followed by an open brace is a
1756    // braced-init-list for an in-class member initialization, not an
1757    // erroneous function definition.
1758    if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) {
1759      IsDefinition = true;
1760    } else if (DeclaratorInfo.isFunctionDeclarator()) {
1761      if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
1762        IsDefinition = true;
1763      } else if (Tok.is(tok::equal)) {
1764        const Token &KW = NextToken();
1765        if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
1766          IsDefinition = true;
1767      }
1768    }
1769
1770    if (IsDefinition) {
1771      if (!DeclaratorInfo.isFunctionDeclarator()) {
1772        Diag(Tok, diag::err_func_def_no_params);
1773        ConsumeBrace();
1774        SkipUntil(tok::r_brace, true);
1775
1776        // Consume the optional ';'
1777        if (Tok.is(tok::semi))
1778          ConsumeToken();
1779        return;
1780      }
1781
1782      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1783        Diag(Tok, diag::err_function_declared_typedef);
1784        // This recovery skips the entire function body. It would be nice
1785        // to simply call ParseCXXInlineMethodDef() below, however Sema
1786        // assumes the declarator represents a function, not a typedef.
1787        ConsumeBrace();
1788        SkipUntil(tok::r_brace, true);
1789
1790        // Consume the optional ';'
1791        if (Tok.is(tok::semi))
1792          ConsumeToken();
1793        return;
1794      }
1795
1796      Decl *FunDecl =
1797        ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
1798                                VS, Init);
1799
1800      for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
1801        LateParsedAttrs[i]->setDecl(FunDecl);
1802      }
1803      LateParsedAttrs.clear();
1804
1805      // Consume the ';' - it's optional unless we have a delete or default
1806      if (Tok.is(tok::semi)) {
1807        ConsumeToken();
1808      }
1809
1810      return;
1811    }
1812  }
1813
1814  // member-declarator-list:
1815  //   member-declarator
1816  //   member-declarator-list ',' member-declarator
1817
1818  SmallVector<Decl *, 8> DeclsInGroup;
1819  ExprResult BitfieldSize;
1820
1821  while (1) {
1822    // member-declarator:
1823    //   declarator pure-specifier[opt]
1824    //   declarator brace-or-equal-initializer[opt]
1825    //   identifier[opt] ':' constant-expression
1826    if (Tok.is(tok::colon)) {
1827      ConsumeToken();
1828      BitfieldSize = ParseConstantExpression();
1829      if (BitfieldSize.isInvalid())
1830        SkipUntil(tok::comma, true, true);
1831    }
1832
1833    // If a simple-asm-expr is present, parse it.
1834    if (Tok.is(tok::kw_asm)) {
1835      SourceLocation Loc;
1836      ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1837      if (AsmLabel.isInvalid())
1838        SkipUntil(tok::comma, true, true);
1839
1840      DeclaratorInfo.setAsmLabel(AsmLabel.release());
1841      DeclaratorInfo.SetRangeEnd(Loc);
1842    }
1843
1844    // If attributes exist after the declarator, parse them.
1845    MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
1846
1847    // FIXME: When g++ adds support for this, we'll need to check whether it
1848    // goes before or after the GNU attributes and __asm__.
1849    ParseOptionalCXX0XVirtSpecifierSeq(VS);
1850
1851    bool HasDeferredInitializer = false;
1852    if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) {
1853      if (BitfieldSize.get()) {
1854        Diag(Tok, diag::err_bitfield_member_init);
1855        SkipUntil(tok::comma, true, true);
1856      } else {
1857        HasInitializer = true;
1858        HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() &&
1859          DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1860            != DeclSpec::SCS_static &&
1861          DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1862            != DeclSpec::SCS_typedef;
1863      }
1864    }
1865
1866    // NOTE: If Sema is the Action module and declarator is an instance field,
1867    // this call will *not* return the created decl; It will return null.
1868    // See Sema::ActOnCXXMemberDeclarator for details.
1869
1870    Decl *ThisDecl = 0;
1871    if (DS.isFriendSpecified()) {
1872      // TODO: handle initializers, bitfields, 'delete'
1873      ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
1874                                                 move(TemplateParams));
1875    } else {
1876      ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
1877                                                  DeclaratorInfo,
1878                                                  move(TemplateParams),
1879                                                  BitfieldSize.release(),
1880                                                  VS, HasDeferredInitializer);
1881      if (AccessAttrs)
1882        Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs,
1883                                         false, true);
1884    }
1885
1886    // Set the Decl for any late parsed attributes
1887    for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
1888      LateParsedAttrs[i]->setDecl(ThisDecl);
1889    }
1890    LateParsedAttrs.clear();
1891
1892    // Handle the initializer.
1893    if (HasDeferredInitializer) {
1894      // The initializer was deferred; parse it and cache the tokens.
1895      Diag(Tok, getLang().CPlusPlus0x ?
1896           diag::warn_cxx98_compat_nonstatic_member_init :
1897           diag::ext_nonstatic_member_init);
1898
1899      if (DeclaratorInfo.isArrayOfUnknownBound()) {
1900        // C++0x [dcl.array]p3: An array bound may also be omitted when the
1901        // declarator is followed by an initializer.
1902        //
1903        // A brace-or-equal-initializer for a member-declarator is not an
1904        // initializer in the gramamr, so this is ill-formed.
1905        Diag(Tok, diag::err_incomplete_array_member_init);
1906        SkipUntil(tok::comma, true, true);
1907        // Avoid later warnings about a class member of incomplete type.
1908        ThisDecl->setInvalidDecl();
1909      } else
1910        ParseCXXNonStaticMemberInitializer(ThisDecl);
1911    } else if (HasInitializer) {
1912      // Normal initializer.
1913      if (!Init.isUsable())
1914        Init = ParseCXXMemberInitializer(
1915                 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
1916
1917      if (Init.isInvalid())
1918        SkipUntil(tok::comma, true, true);
1919      else if (ThisDecl)
1920        Actions.AddInitializerToDecl(ThisDecl, Init.get(), false,
1921                                   DS.getTypeSpecType() == DeclSpec::TST_auto);
1922    } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) {
1923      // No initializer.
1924      Actions.ActOnUninitializedDecl(ThisDecl,
1925                                   DS.getTypeSpecType() == DeclSpec::TST_auto);
1926    }
1927
1928    if (ThisDecl) {
1929      Actions.FinalizeDeclaration(ThisDecl);
1930      DeclsInGroup.push_back(ThisDecl);
1931    }
1932
1933    if (DeclaratorInfo.isFunctionDeclarator() &&
1934        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1935          != DeclSpec::SCS_typedef) {
1936      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1937    }
1938
1939    DeclaratorInfo.complete(ThisDecl);
1940
1941    // If we don't have a comma, it is either the end of the list (a ';')
1942    // or an error, bail out.
1943    if (Tok.isNot(tok::comma))
1944      break;
1945
1946    // Consume the comma.
1947    ConsumeToken();
1948
1949    // Parse the next declarator.
1950    DeclaratorInfo.clear();
1951    VS.clear();
1952    BitfieldSize = true;
1953    Init = true;
1954    HasInitializer = false;
1955
1956    // Attributes are only allowed on the second declarator.
1957    MaybeParseGNUAttributes(DeclaratorInfo);
1958
1959    if (Tok.isNot(tok::colon))
1960      ParseDeclarator(DeclaratorInfo);
1961  }
1962
1963  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1964    // Skip to end of block or statement.
1965    SkipUntil(tok::r_brace, true, true);
1966    // If we stopped at a ';', eat it.
1967    if (Tok.is(tok::semi)) ConsumeToken();
1968    return;
1969  }
1970
1971  Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
1972                                  DeclsInGroup.size());
1973}
1974
1975/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or
1976/// pure-specifier. Also detect and reject any attempted defaulted/deleted
1977/// function definition. The location of the '=', if any, will be placed in
1978/// EqualLoc.
1979///
1980///   pure-specifier:
1981///     '= 0'
1982///
1983///   brace-or-equal-initializer:
1984///     '=' initializer-expression
1985///     braced-init-list                       [TODO]
1986///
1987///   initializer-clause:
1988///     assignment-expression
1989///     braced-init-list                       [TODO]
1990///
1991///   defaulted/deleted function-definition:
1992///     '=' 'default'
1993///     '=' 'delete'
1994///
1995/// Prior to C++0x, the assignment-expression in an initializer-clause must
1996/// be a constant-expression.
1997ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction,
1998                                             SourceLocation &EqualLoc) {
1999  assert((Tok.is(tok::equal) || Tok.is(tok::l_brace))
2000         && "Data member initializer not starting with '=' or '{'");
2001
2002  if (Tok.is(tok::equal)) {
2003    EqualLoc = ConsumeToken();
2004    if (Tok.is(tok::kw_delete)) {
2005      // In principle, an initializer of '= delete p;' is legal, but it will
2006      // never type-check. It's better to diagnose it as an ill-formed expression
2007      // than as an ill-formed deleted non-function member.
2008      // An initializer of '= delete p, foo' will never be parsed, because
2009      // a top-level comma always ends the initializer expression.
2010      const Token &Next = NextToken();
2011      if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) ||
2012           Next.is(tok::eof)) {
2013        if (IsFunction)
2014          Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2015            << 1 /* delete */;
2016        else
2017          Diag(ConsumeToken(), diag::err_deleted_non_function);
2018        return ExprResult();
2019      }
2020    } else if (Tok.is(tok::kw_default)) {
2021      if (IsFunction)
2022        Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2023          << 0 /* default */;
2024      else
2025        Diag(ConsumeToken(), diag::err_default_special_members);
2026      return ExprResult();
2027    }
2028
2029    return ParseInitializer();
2030  } else
2031    return ExprError(Diag(Tok, diag::err_generalized_initializer_lists));
2032}
2033
2034/// ParseCXXMemberSpecification - Parse the class definition.
2035///
2036///       member-specification:
2037///         member-declaration member-specification[opt]
2038///         access-specifier ':' member-specification[opt]
2039///
2040void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
2041                                         unsigned TagType, Decl *TagDecl) {
2042  assert((TagType == DeclSpec::TST_struct ||
2043         TagType == DeclSpec::TST_union  ||
2044         TagType == DeclSpec::TST_class) && "Invalid TagType!");
2045
2046  PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2047                                      "parsing struct/union/class body");
2048
2049  // Determine whether this is a non-nested class. Note that local
2050  // classes are *not* considered to be nested classes.
2051  bool NonNestedClass = true;
2052  if (!ClassStack.empty()) {
2053    for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2054      if (S->isClassScope()) {
2055        // We're inside a class scope, so this is a nested class.
2056        NonNestedClass = false;
2057        break;
2058      }
2059
2060      if ((S->getFlags() & Scope::FnScope)) {
2061        // If we're in a function or function template declared in the
2062        // body of a class, then this is a local class rather than a
2063        // nested class.
2064        const Scope *Parent = S->getParent();
2065        if (Parent->isTemplateParamScope())
2066          Parent = Parent->getParent();
2067        if (Parent->isClassScope())
2068          break;
2069      }
2070    }
2071  }
2072
2073  // Enter a scope for the class.
2074  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2075
2076  // Note that we are parsing a new (potentially-nested) class definition.
2077  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
2078
2079  if (TagDecl)
2080    Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2081
2082  SourceLocation FinalLoc;
2083
2084  // Parse the optional 'final' keyword.
2085  if (getLang().CPlusPlus && Tok.is(tok::identifier)) {
2086    assert(isCXX0XFinalKeyword() && "not a class definition");
2087    FinalLoc = ConsumeToken();
2088
2089    Diag(FinalLoc, getLang().CPlusPlus0x ?
2090         diag::warn_cxx98_compat_override_control_keyword :
2091         diag::ext_override_control_keyword) << "final";
2092  }
2093
2094  if (Tok.is(tok::colon)) {
2095    ParseBaseClause(TagDecl);
2096
2097    if (!Tok.is(tok::l_brace)) {
2098      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
2099
2100      if (TagDecl)
2101        Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
2102      return;
2103    }
2104  }
2105
2106  assert(Tok.is(tok::l_brace));
2107  BalancedDelimiterTracker T(*this, tok::l_brace);
2108  T.consumeOpen();
2109
2110  if (TagDecl)
2111    Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
2112                                            T.getOpenLocation());
2113
2114  // C++ 11p3: Members of a class defined with the keyword class are private
2115  // by default. Members of a class defined with the keywords struct or union
2116  // are public by default.
2117  AccessSpecifier CurAS;
2118  if (TagType == DeclSpec::TST_class)
2119    CurAS = AS_private;
2120  else
2121    CurAS = AS_public;
2122  ParsedAttributes AccessAttrs(AttrFactory);
2123
2124  if (TagDecl) {
2125    // While we still have something to read, read the member-declarations.
2126    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
2127      // Each iteration of this loop reads one member-declaration.
2128
2129      if (getLang().MicrosoftExt && (Tok.is(tok::kw___if_exists) ||
2130          Tok.is(tok::kw___if_not_exists))) {
2131        ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2132        continue;
2133      }
2134
2135      // Check for extraneous top-level semicolon.
2136      if (Tok.is(tok::semi)) {
2137        Diag(Tok, diag::ext_extra_struct_semi)
2138          << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
2139          << FixItHint::CreateRemoval(Tok.getLocation());
2140        ConsumeToken();
2141        continue;
2142      }
2143
2144      AccessSpecifier AS = getAccessSpecifierIfPresent();
2145      if (AS != AS_none) {
2146        // Current token is a C++ access specifier.
2147        CurAS = AS;
2148        SourceLocation ASLoc = Tok.getLocation();
2149        unsigned TokLength = Tok.getLength();
2150        ConsumeToken();
2151        AccessAttrs.clear();
2152        MaybeParseGNUAttributes(AccessAttrs);
2153
2154        SourceLocation EndLoc;
2155        if (Tok.is(tok::colon)) {
2156          EndLoc = Tok.getLocation();
2157          ConsumeToken();
2158        } else if (Tok.is(tok::semi)) {
2159          EndLoc = Tok.getLocation();
2160          ConsumeToken();
2161          Diag(EndLoc, diag::err_expected_colon)
2162            << FixItHint::CreateReplacement(EndLoc, ":");
2163        } else {
2164          EndLoc = ASLoc.getLocWithOffset(TokLength);
2165          Diag(EndLoc, diag::err_expected_colon)
2166            << FixItHint::CreateInsertion(EndLoc, ":");
2167        }
2168
2169        if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc,
2170                                         AccessAttrs.getList())) {
2171          // found another attribute than only annotations
2172          AccessAttrs.clear();
2173        }
2174
2175        continue;
2176      }
2177
2178      // FIXME: Make sure we don't have a template here.
2179
2180      // Parse all the comma separated declarators.
2181      ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList());
2182    }
2183
2184    T.consumeClose();
2185  } else {
2186    SkipUntil(tok::r_brace, false, false);
2187  }
2188
2189  // If attributes exist after class contents, parse them.
2190  ParsedAttributes attrs(AttrFactory);
2191  MaybeParseGNUAttributes(attrs);
2192
2193  if (TagDecl)
2194    Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
2195                                              T.getOpenLocation(),
2196                                              T.getCloseLocation(),
2197                                              attrs.getList());
2198
2199  // C++0x [class.mem]p2: Within the class member-specification, the class is
2200  // regarded as complete within function bodies, default arguments, exception-
2201  // specifications, and brace-or-equal-initializers for non-static data
2202  // members (including such things in nested classes).
2203  //
2204  // FIXME: Only function bodies and brace-or-equal-initializers are currently
2205  // handled. Fix the others!
2206  if (TagDecl && NonNestedClass) {
2207    // We are not inside a nested class. This class and its nested classes
2208    // are complete and we can parse the delayed portions of method
2209    // declarations and the lexed inline method definitions, along with any
2210    // delayed attributes.
2211    SourceLocation SavedPrevTokLocation = PrevTokLocation;
2212    ParseLexedAttributes(getCurrentClass());
2213    ParseLexedMethodDeclarations(getCurrentClass());
2214    ParseLexedMemberInitializers(getCurrentClass());
2215    ParseLexedMethodDefs(getCurrentClass());
2216    PrevTokLocation = SavedPrevTokLocation;
2217  }
2218
2219  if (TagDecl)
2220    Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl,
2221                                     T.getCloseLocation());
2222
2223  // Leave the class scope.
2224  ParsingDef.Pop();
2225  ClassScope.Exit();
2226}
2227
2228/// ParseConstructorInitializer - Parse a C++ constructor initializer,
2229/// which explicitly initializes the members or base classes of a
2230/// class (C++ [class.base.init]). For example, the three initializers
2231/// after the ':' in the Derived constructor below:
2232///
2233/// @code
2234/// class Base { };
2235/// class Derived : Base {
2236///   int x;
2237///   float f;
2238/// public:
2239///   Derived(float f) : Base(), x(17), f(f) { }
2240/// };
2241/// @endcode
2242///
2243/// [C++]  ctor-initializer:
2244///          ':' mem-initializer-list
2245///
2246/// [C++]  mem-initializer-list:
2247///          mem-initializer ...[opt]
2248///          mem-initializer ...[opt] , mem-initializer-list
2249void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
2250  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
2251
2252  // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
2253  PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
2254  SourceLocation ColonLoc = ConsumeToken();
2255
2256  SmallVector<CXXCtorInitializer*, 4> MemInitializers;
2257  bool AnyErrors = false;
2258
2259  do {
2260    if (Tok.is(tok::code_completion)) {
2261      Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
2262                                                 MemInitializers.data(),
2263                                                 MemInitializers.size());
2264      return cutOffParsing();
2265    } else {
2266      MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
2267      if (!MemInit.isInvalid())
2268        MemInitializers.push_back(MemInit.get());
2269      else
2270        AnyErrors = true;
2271    }
2272
2273    if (Tok.is(tok::comma))
2274      ConsumeToken();
2275    else if (Tok.is(tok::l_brace))
2276      break;
2277    // If the next token looks like a base or member initializer, assume that
2278    // we're just missing a comma.
2279    else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
2280      SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
2281      Diag(Loc, diag::err_ctor_init_missing_comma)
2282        << FixItHint::CreateInsertion(Loc, ", ");
2283    } else {
2284      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
2285      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
2286      SkipUntil(tok::l_brace, true, true);
2287      break;
2288    }
2289  } while (true);
2290
2291  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
2292                               MemInitializers.data(), MemInitializers.size(),
2293                               AnyErrors);
2294}
2295
2296/// ParseMemInitializer - Parse a C++ member initializer, which is
2297/// part of a constructor initializer that explicitly initializes one
2298/// member or base class (C++ [class.base.init]). See
2299/// ParseConstructorInitializer for an example.
2300///
2301/// [C++] mem-initializer:
2302///         mem-initializer-id '(' expression-list[opt] ')'
2303/// [C++0x] mem-initializer-id braced-init-list
2304///
2305/// [C++] mem-initializer-id:
2306///         '::'[opt] nested-name-specifier[opt] class-name
2307///         identifier
2308Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
2309  // parse '::'[opt] nested-name-specifier[opt]
2310  CXXScopeSpec SS;
2311  ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
2312  ParsedType TemplateTypeTy;
2313  if (Tok.is(tok::annot_template_id)) {
2314    TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2315    if (TemplateId->Kind == TNK_Type_template ||
2316        TemplateId->Kind == TNK_Dependent_template_name) {
2317      AnnotateTemplateIdTokenAsType();
2318      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2319      TemplateTypeTy = getTypeAnnotation(Tok);
2320    }
2321  }
2322  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
2323    Diag(Tok, diag::err_expected_member_or_base_name);
2324    return true;
2325  }
2326
2327  // Get the identifier. This may be a member name or a class name,
2328  // but we'll let the semantic analysis determine which it is.
2329  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
2330  SourceLocation IdLoc = ConsumeToken();
2331
2332  // Parse the '('.
2333  if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) {
2334    Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2335
2336    ExprResult InitList = ParseBraceInitializer();
2337    if (InitList.isInvalid())
2338      return true;
2339
2340    SourceLocation EllipsisLoc;
2341    if (Tok.is(tok::ellipsis))
2342      EllipsisLoc = ConsumeToken();
2343
2344    return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2345                                       TemplateTypeTy, IdLoc, InitList.take(),
2346                                       EllipsisLoc);
2347  } else if(Tok.is(tok::l_paren)) {
2348    BalancedDelimiterTracker T(*this, tok::l_paren);
2349    T.consumeOpen();
2350
2351    // Parse the optional expression-list.
2352    ExprVector ArgExprs(Actions);
2353    CommaLocsTy CommaLocs;
2354    if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2355      SkipUntil(tok::r_paren);
2356      return true;
2357    }
2358
2359    T.consumeClose();
2360
2361    SourceLocation EllipsisLoc;
2362    if (Tok.is(tok::ellipsis))
2363      EllipsisLoc = ConsumeToken();
2364
2365    return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2366                                       TemplateTypeTy, IdLoc,
2367                                       T.getOpenLocation(), ArgExprs.take(),
2368                                       ArgExprs.size(), T.getCloseLocation(),
2369                                       EllipsisLoc);
2370  }
2371
2372  Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace
2373                                  : diag::err_expected_lparen);
2374  return true;
2375}
2376
2377/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2378///
2379///       exception-specification:
2380///         dynamic-exception-specification
2381///         noexcept-specification
2382///
2383///       noexcept-specification:
2384///         'noexcept'
2385///         'noexcept' '(' constant-expression ')'
2386ExceptionSpecificationType
2387Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange,
2388                    SmallVectorImpl<ParsedType> &DynamicExceptions,
2389                    SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2390                    ExprResult &NoexceptExpr) {
2391  ExceptionSpecificationType Result = EST_None;
2392
2393  // See if there's a dynamic specification.
2394  if (Tok.is(tok::kw_throw)) {
2395    Result = ParseDynamicExceptionSpecification(SpecificationRange,
2396                                                DynamicExceptions,
2397                                                DynamicExceptionRanges);
2398    assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2399           "Produced different number of exception types and ranges.");
2400  }
2401
2402  // If there's no noexcept specification, we're done.
2403  if (Tok.isNot(tok::kw_noexcept))
2404    return Result;
2405
2406  Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
2407
2408  // If we already had a dynamic specification, parse the noexcept for,
2409  // recovery, but emit a diagnostic and don't store the results.
2410  SourceRange NoexceptRange;
2411  ExceptionSpecificationType NoexceptType = EST_None;
2412
2413  SourceLocation KeywordLoc = ConsumeToken();
2414  if (Tok.is(tok::l_paren)) {
2415    // There is an argument.
2416    BalancedDelimiterTracker T(*this, tok::l_paren);
2417    T.consumeOpen();
2418    NoexceptType = EST_ComputedNoexcept;
2419    NoexceptExpr = ParseConstantExpression();
2420    // The argument must be contextually convertible to bool. We use
2421    // ActOnBooleanCondition for this purpose.
2422    if (!NoexceptExpr.isInvalid())
2423      NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2424                                                   NoexceptExpr.get());
2425    T.consumeClose();
2426    NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
2427  } else {
2428    // There is no argument.
2429    NoexceptType = EST_BasicNoexcept;
2430    NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2431  }
2432
2433  if (Result == EST_None) {
2434    SpecificationRange = NoexceptRange;
2435    Result = NoexceptType;
2436
2437    // If there's a dynamic specification after a noexcept specification,
2438    // parse that and ignore the results.
2439    if (Tok.is(tok::kw_throw)) {
2440      Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2441      ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2442                                         DynamicExceptionRanges);
2443    }
2444  } else {
2445    Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2446  }
2447
2448  return Result;
2449}
2450
2451/// ParseDynamicExceptionSpecification - Parse a C++
2452/// dynamic-exception-specification (C++ [except.spec]).
2453///
2454///       dynamic-exception-specification:
2455///         'throw' '(' type-id-list [opt] ')'
2456/// [MS]    'throw' '(' '...' ')'
2457///
2458///       type-id-list:
2459///         type-id ... [opt]
2460///         type-id-list ',' type-id ... [opt]
2461///
2462ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2463                                  SourceRange &SpecificationRange,
2464                                  SmallVectorImpl<ParsedType> &Exceptions,
2465                                  SmallVectorImpl<SourceRange> &Ranges) {
2466  assert(Tok.is(tok::kw_throw) && "expected throw");
2467
2468  SpecificationRange.setBegin(ConsumeToken());
2469  BalancedDelimiterTracker T(*this, tok::l_paren);
2470  if (T.consumeOpen()) {
2471    Diag(Tok, diag::err_expected_lparen_after) << "throw";
2472    SpecificationRange.setEnd(SpecificationRange.getBegin());
2473    return EST_DynamicNone;
2474  }
2475
2476  // Parse throw(...), a Microsoft extension that means "this function
2477  // can throw anything".
2478  if (Tok.is(tok::ellipsis)) {
2479    SourceLocation EllipsisLoc = ConsumeToken();
2480    if (!getLang().MicrosoftExt)
2481      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2482    T.consumeClose();
2483    SpecificationRange.setEnd(T.getCloseLocation());
2484    return EST_MSAny;
2485  }
2486
2487  // Parse the sequence of type-ids.
2488  SourceRange Range;
2489  while (Tok.isNot(tok::r_paren)) {
2490    TypeResult Res(ParseTypeName(&Range));
2491
2492    if (Tok.is(tok::ellipsis)) {
2493      // C++0x [temp.variadic]p5:
2494      //   - In a dynamic-exception-specification (15.4); the pattern is a
2495      //     type-id.
2496      SourceLocation Ellipsis = ConsumeToken();
2497      Range.setEnd(Ellipsis);
2498      if (!Res.isInvalid())
2499        Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2500    }
2501
2502    if (!Res.isInvalid()) {
2503      Exceptions.push_back(Res.get());
2504      Ranges.push_back(Range);
2505    }
2506
2507    if (Tok.is(tok::comma))
2508      ConsumeToken();
2509    else
2510      break;
2511  }
2512
2513  T.consumeClose();
2514  SpecificationRange.setEnd(T.getCloseLocation());
2515  return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
2516}
2517
2518/// ParseTrailingReturnType - Parse a trailing return type on a new-style
2519/// function declaration.
2520TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
2521  assert(Tok.is(tok::arrow) && "expected arrow");
2522
2523  ConsumeToken();
2524
2525  // FIXME: Need to suppress declarations when parsing this typename.
2526  // Otherwise in this function definition:
2527  //
2528  //   auto f() -> struct X {}
2529  //
2530  // struct X is parsed as class definition because of the trailing
2531  // brace.
2532  return ParseTypeName(&Range);
2533}
2534
2535/// \brief We have just started parsing the definition of a new class,
2536/// so push that class onto our stack of classes that is currently
2537/// being parsed.
2538Sema::ParsingClassState
2539Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
2540  assert((NonNestedClass || !ClassStack.empty()) &&
2541         "Nested class without outer class");
2542  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
2543  return Actions.PushParsingClass();
2544}
2545
2546/// \brief Deallocate the given parsed class and all of its nested
2547/// classes.
2548void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
2549  for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
2550    delete Class->LateParsedDeclarations[I];
2551  delete Class;
2552}
2553
2554/// \brief Pop the top class of the stack of classes that are
2555/// currently being parsed.
2556///
2557/// This routine should be called when we have finished parsing the
2558/// definition of a class, but have not yet popped the Scope
2559/// associated with the class's definition.
2560///
2561/// \returns true if the class we've popped is a top-level class,
2562/// false otherwise.
2563void Parser::PopParsingClass(Sema::ParsingClassState state) {
2564  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
2565
2566  Actions.PopParsingClass(state);
2567
2568  ParsingClass *Victim = ClassStack.top();
2569  ClassStack.pop();
2570  if (Victim->TopLevelClass) {
2571    // Deallocate all of the nested classes of this class,
2572    // recursively: we don't need to keep any of this information.
2573    DeallocateParsedClasses(Victim);
2574    return;
2575  }
2576  assert(!ClassStack.empty() && "Missing top-level class?");
2577
2578  if (Victim->LateParsedDeclarations.empty()) {
2579    // The victim is a nested class, but we will not need to perform
2580    // any processing after the definition of this class since it has
2581    // no members whose handling was delayed. Therefore, we can just
2582    // remove this nested class.
2583    DeallocateParsedClasses(Victim);
2584    return;
2585  }
2586
2587  // This nested class has some members that will need to be processed
2588  // after the top-level class is completely defined. Therefore, add
2589  // it to the list of nested classes within its parent.
2590  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
2591  ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
2592  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
2593}
2594
2595/// ParseCXX0XAttributeSpecifier - Parse a C++0x attribute-specifier. Currently
2596/// only parses standard attributes.
2597///
2598/// [C++0x] attribute-specifier:
2599///         '[' '[' attribute-list ']' ']'
2600///         alignment-specifier
2601///
2602/// [C++0x] attribute-list:
2603///         attribute[opt]
2604///         attribute-list ',' attribute[opt]
2605///
2606/// [C++0x] attribute:
2607///         attribute-token attribute-argument-clause[opt]
2608///
2609/// [C++0x] attribute-token:
2610///         identifier
2611///         attribute-scoped-token
2612///
2613/// [C++0x] attribute-scoped-token:
2614///         attribute-namespace '::' identifier
2615///
2616/// [C++0x] attribute-namespace:
2617///         identifier
2618///
2619/// [C++0x] attribute-argument-clause:
2620///         '(' balanced-token-seq ')'
2621///
2622/// [C++0x] balanced-token-seq:
2623///         balanced-token
2624///         balanced-token-seq balanced-token
2625///
2626/// [C++0x] balanced-token:
2627///         '(' balanced-token-seq ')'
2628///         '[' balanced-token-seq ']'
2629///         '{' balanced-token-seq '}'
2630///         any token but '(', ')', '[', ']', '{', or '}'
2631void Parser::ParseCXX0XAttributeSpecifier(ParsedAttributes &attrs,
2632                                          SourceLocation *endLoc) {
2633  if (Tok.is(tok::kw_alignas)) {
2634    Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
2635    ParseAlignmentSpecifier(attrs, endLoc);
2636    return;
2637  }
2638
2639  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
2640      && "Not a C++0x attribute list");
2641
2642  Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
2643
2644  ConsumeBracket();
2645  ConsumeBracket();
2646
2647  if (Tok.is(tok::comma)) {
2648    Diag(Tok.getLocation(), diag::err_expected_ident);
2649    ConsumeToken();
2650  }
2651
2652  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
2653    // attribute not present
2654    if (Tok.is(tok::comma)) {
2655      ConsumeToken();
2656      continue;
2657    }
2658
2659    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
2660    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
2661
2662    // scoped attribute
2663    if (Tok.is(tok::coloncolon)) {
2664      ConsumeToken();
2665
2666      if (!Tok.is(tok::identifier)) {
2667        Diag(Tok.getLocation(), diag::err_expected_ident);
2668        SkipUntil(tok::r_square, tok::comma, true, true);
2669        continue;
2670      }
2671
2672      ScopeName = AttrName;
2673      ScopeLoc = AttrLoc;
2674
2675      AttrName = Tok.getIdentifierInfo();
2676      AttrLoc = ConsumeToken();
2677    }
2678
2679    bool AttrParsed = false;
2680    // No scoped names are supported; ideally we could put all non-standard
2681    // attributes into namespaces.
2682    if (!ScopeName) {
2683      switch(AttributeList::getKind(AttrName))
2684      {
2685      // No arguments
2686      case AttributeList::AT_carries_dependency:
2687      case AttributeList::AT_noreturn: {
2688        if (Tok.is(tok::l_paren)) {
2689          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
2690            << AttrName->getName();
2691          break;
2692        }
2693
2694        attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0,
2695                     SourceLocation(), 0, 0, false, true);
2696        AttrParsed = true;
2697        break;
2698      }
2699
2700      // Silence warnings
2701      default: break;
2702      }
2703    }
2704
2705    // Skip the entire parameter clause, if any
2706    if (!AttrParsed && Tok.is(tok::l_paren)) {
2707      ConsumeParen();
2708      // SkipUntil maintains the balancedness of tokens.
2709      SkipUntil(tok::r_paren, false);
2710    }
2711  }
2712
2713  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2714    SkipUntil(tok::r_square, false);
2715  if (endLoc)
2716    *endLoc = Tok.getLocation();
2717  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2718    SkipUntil(tok::r_square, false);
2719}
2720
2721/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier-seq.
2722///
2723/// attribute-specifier-seq:
2724///       attribute-specifier-seq[opt] attribute-specifier
2725void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs,
2726                                  SourceLocation *endLoc) {
2727  SourceLocation StartLoc = Tok.getLocation(), Loc;
2728  if (!endLoc)
2729    endLoc = &Loc;
2730
2731  do {
2732    ParseCXX0XAttributeSpecifier(attrs, endLoc);
2733  } while (isCXX0XAttributeSpecifier());
2734
2735  attrs.Range = SourceRange(StartLoc, *endLoc);
2736}
2737
2738/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
2739///
2740/// [MS] ms-attribute:
2741///             '[' token-seq ']'
2742///
2743/// [MS] ms-attribute-seq:
2744///             ms-attribute[opt]
2745///             ms-attribute ms-attribute-seq
2746void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
2747                                      SourceLocation *endLoc) {
2748  assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
2749
2750  while (Tok.is(tok::l_square)) {
2751    ConsumeBracket();
2752    SkipUntil(tok::r_square, true, true);
2753    if (endLoc) *endLoc = Tok.getLocation();
2754    ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
2755  }
2756}
2757
2758void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
2759                                                    AccessSpecifier& CurAS) {
2760  bool Result;
2761  if (ParseMicrosoftIfExistsCondition(Result))
2762    return;
2763
2764  if (Tok.isNot(tok::l_brace)) {
2765    Diag(Tok, diag::err_expected_lbrace);
2766    return;
2767  }
2768  ConsumeBrace();
2769
2770  // Condition is false skip all inside the {}.
2771  if (!Result) {
2772    SkipUntil(tok::r_brace, false);
2773    return;
2774  }
2775
2776  // Condition is true, parse the declaration.
2777  while (Tok.isNot(tok::r_brace)) {
2778
2779    // __if_exists, __if_not_exists can nest.
2780    if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) {
2781      ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2782      continue;
2783    }
2784
2785    // Check for extraneous top-level semicolon.
2786    if (Tok.is(tok::semi)) {
2787      Diag(Tok, diag::ext_extra_struct_semi)
2788        << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
2789        << FixItHint::CreateRemoval(Tok.getLocation());
2790      ConsumeToken();
2791      continue;
2792    }
2793
2794    AccessSpecifier AS = getAccessSpecifierIfPresent();
2795    if (AS != AS_none) {
2796      // Current token is a C++ access specifier.
2797      CurAS = AS;
2798      SourceLocation ASLoc = Tok.getLocation();
2799      ConsumeToken();
2800      if (Tok.is(tok::colon))
2801        Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
2802      else
2803        Diag(Tok, diag::err_expected_colon);
2804      ConsumeToken();
2805      continue;
2806    }
2807
2808    // Parse all the comma separated declarators.
2809    ParseCXXClassMemberDeclaration(CurAS, 0);
2810  }
2811
2812  if (Tok.isNot(tok::r_brace)) {
2813    Diag(Tok, diag::err_expected_rbrace);
2814    return;
2815  }
2816  ConsumeBrace();
2817}
2818