ParseDeclCXX.cpp revision 201361 
1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements the C++ Declaration portions of the Parser interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/OperatorKinds.h"
15#include "clang/Parse/Parser.h"
16#include "clang/Parse/ParseDiagnostic.h"
17#include "clang/Parse/DeclSpec.h"
18#include "clang/Parse/Scope.h"
19#include "clang/Parse/Template.h"
20#include "RAIIObjectsForParser.h"
21using namespace clang;
22
23/// ParseNamespace - We know that the current token is a namespace keyword. This
24/// may either be a top level namespace or a block-level namespace alias.
25///
26///       namespace-definition: [C++ 7.3: basic.namespace]
27///         named-namespace-definition
28///         unnamed-namespace-definition
29///
30///       unnamed-namespace-definition:
31///         'namespace' attributes[opt] '{' namespace-body '}'
32///
33///       named-namespace-definition:
34///         original-namespace-definition
35///         extension-namespace-definition
36///
37///       original-namespace-definition:
38///         'namespace' identifier attributes[opt] '{' namespace-body '}'
39///
40///       extension-namespace-definition:
41///         'namespace' original-namespace-name '{' namespace-body '}'
42///
43///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
44///         'namespace' identifier '=' qualified-namespace-specifier ';'
45///
46Parser::DeclPtrTy Parser::ParseNamespace(unsigned Context,
47                                         SourceLocation &DeclEnd) {
48  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
49  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
50
51  if (Tok.is(tok::code_completion)) {
52    Actions.CodeCompleteNamespaceDecl(CurScope);
53    ConsumeToken();
54  }
55
56  SourceLocation IdentLoc;
57  IdentifierInfo *Ident = 0;
58
59  Token attrTok;
60
61  if (Tok.is(tok::identifier)) {
62    Ident = Tok.getIdentifierInfo();
63    IdentLoc = ConsumeToken();  // eat the identifier.
64  }
65
66  // Read label attributes, if present.
67  Action::AttrTy *AttrList = 0;
68  if (Tok.is(tok::kw___attribute)) {
69    attrTok = Tok;
70
71    // FIXME: save these somewhere.
72    AttrList = ParseGNUAttributes();
73  }
74
75  if (Tok.is(tok::equal)) {
76    if (AttrList)
77      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
78
79    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
80  }
81
82  if (Tok.isNot(tok::l_brace)) {
83    Diag(Tok, Ident ? diag::err_expected_lbrace :
84         diag::err_expected_ident_lbrace);
85    return DeclPtrTy();
86  }
87
88  SourceLocation LBrace = ConsumeBrace();
89
90  // Enter a scope for the namespace.
91  ParseScope NamespaceScope(this, Scope::DeclScope);
92
93  DeclPtrTy NamespcDecl =
94    Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace);
95
96  PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
97                                        PP.getSourceManager(),
98                                        "parsing namespace");
99
100  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
101    CXX0XAttributeList Attr;
102    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
103      Attr = ParseCXX0XAttributes();
104    ParseExternalDeclaration(Attr);
105  }
106
107  // Leave the namespace scope.
108  NamespaceScope.Exit();
109
110  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
111  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
112
113  DeclEnd = RBraceLoc;
114  return NamespcDecl;
115}
116
117/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
118/// alias definition.
119///
120Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
121                                              SourceLocation AliasLoc,
122                                              IdentifierInfo *Alias,
123                                              SourceLocation &DeclEnd) {
124  assert(Tok.is(tok::equal) && "Not equal token");
125
126  ConsumeToken(); // eat the '='.
127
128  if (Tok.is(tok::code_completion)) {
129    Actions.CodeCompleteNamespaceAliasDecl(CurScope);
130    ConsumeToken();
131  }
132
133  CXXScopeSpec SS;
134  // Parse (optional) nested-name-specifier.
135  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
136
137  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
138    Diag(Tok, diag::err_expected_namespace_name);
139    // Skip to end of the definition and eat the ';'.
140    SkipUntil(tok::semi);
141    return DeclPtrTy();
142  }
143
144  // Parse identifier.
145  IdentifierInfo *Ident = Tok.getIdentifierInfo();
146  SourceLocation IdentLoc = ConsumeToken();
147
148  // Eat the ';'.
149  DeclEnd = Tok.getLocation();
150  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
151                   "", tok::semi);
152
153  return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias,
154                                        SS, IdentLoc, Ident);
155}
156
157/// ParseLinkage - We know that the current token is a string_literal
158/// and just before that, that extern was seen.
159///
160///       linkage-specification: [C++ 7.5p2: dcl.link]
161///         'extern' string-literal '{' declaration-seq[opt] '}'
162///         'extern' string-literal declaration
163///
164Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS,
165                                       unsigned Context) {
166  assert(Tok.is(tok::string_literal) && "Not a string literal!");
167  llvm::SmallVector<char, 8> LangBuffer;
168  // LangBuffer is guaranteed to be big enough.
169  LangBuffer.resize(Tok.getLength());
170  const char *LangBufPtr = &LangBuffer[0];
171  unsigned StrSize = PP.getSpelling(Tok, LangBufPtr);
172
173  SourceLocation Loc = ConsumeStringToken();
174
175  ParseScope LinkageScope(this, Scope::DeclScope);
176  DeclPtrTy LinkageSpec
177    = Actions.ActOnStartLinkageSpecification(CurScope,
178                                             /*FIXME: */SourceLocation(),
179                                             Loc, LangBufPtr, StrSize,
180                                       Tok.is(tok::l_brace)? Tok.getLocation()
181                                                           : SourceLocation());
182
183  CXX0XAttributeList Attr;
184  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
185    Attr = ParseCXX0XAttributes();
186  }
187
188  if (Tok.isNot(tok::l_brace)) {
189    ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList);
190    return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
191                                                   SourceLocation());
192  }
193
194  if (Attr.HasAttr)
195    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
196      << Attr.Range;
197
198  SourceLocation LBrace = ConsumeBrace();
199  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
200    CXX0XAttributeList Attr;
201    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
202      Attr = ParseCXX0XAttributes();
203    ParseExternalDeclaration(Attr);
204  }
205
206  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
207  return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
208}
209
210/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
211/// using-directive. Assumes that current token is 'using'.
212Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
213                                                     SourceLocation &DeclEnd,
214                                                     CXX0XAttributeList Attr) {
215  assert(Tok.is(tok::kw_using) && "Not using token");
216
217  // Eat 'using'.
218  SourceLocation UsingLoc = ConsumeToken();
219
220  if (Tok.is(tok::code_completion)) {
221    Actions.CodeCompleteUsing(CurScope);
222    ConsumeToken();
223  }
224
225  if (Tok.is(tok::kw_namespace))
226    // Next token after 'using' is 'namespace' so it must be using-directive
227    return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
228
229  if (Attr.HasAttr)
230    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
231      << Attr.Range;
232
233  // Otherwise, it must be using-declaration.
234  // Ignore illegal attributes (the caller should already have issued an error.
235  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
236}
237
238/// ParseUsingDirective - Parse C++ using-directive, assumes
239/// that current token is 'namespace' and 'using' was already parsed.
240///
241///       using-directive: [C++ 7.3.p4: namespace.udir]
242///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
243///                 namespace-name ;
244/// [GNU] using-directive:
245///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
246///                 namespace-name attributes[opt] ;
247///
248Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
249                                              SourceLocation UsingLoc,
250                                              SourceLocation &DeclEnd,
251                                              AttributeList *Attr) {
252  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
253
254  // Eat 'namespace'.
255  SourceLocation NamespcLoc = ConsumeToken();
256
257  if (Tok.is(tok::code_completion)) {
258    Actions.CodeCompleteUsingDirective(CurScope);
259    ConsumeToken();
260  }
261
262  CXXScopeSpec SS;
263  // Parse (optional) nested-name-specifier.
264  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
265
266  IdentifierInfo *NamespcName = 0;
267  SourceLocation IdentLoc = SourceLocation();
268
269  // Parse namespace-name.
270  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
271    Diag(Tok, diag::err_expected_namespace_name);
272    // If there was invalid namespace name, skip to end of decl, and eat ';'.
273    SkipUntil(tok::semi);
274    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
275    return DeclPtrTy();
276  }
277
278  // Parse identifier.
279  NamespcName = Tok.getIdentifierInfo();
280  IdentLoc = ConsumeToken();
281
282  // Parse (optional) attributes (most likely GNU strong-using extension).
283  bool GNUAttr = false;
284  if (Tok.is(tok::kw___attribute)) {
285    GNUAttr = true;
286    Attr = addAttributeLists(Attr, ParseGNUAttributes());
287  }
288
289  // Eat ';'.
290  DeclEnd = Tok.getLocation();
291  ExpectAndConsume(tok::semi,
292                   GNUAttr ? diag::err_expected_semi_after_attribute_list :
293                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
294
295  return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
296                                      IdentLoc, NamespcName, Attr);
297}
298
299/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
300/// 'using' was already seen.
301///
302///     using-declaration: [C++ 7.3.p3: namespace.udecl]
303///       'using' 'typename'[opt] ::[opt] nested-name-specifier
304///               unqualified-id
305///       'using' :: unqualified-id
306///
307Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
308                                                SourceLocation UsingLoc,
309                                                SourceLocation &DeclEnd,
310                                                AccessSpecifier AS) {
311  CXXScopeSpec SS;
312  SourceLocation TypenameLoc;
313  bool IsTypeName;
314
315  // Ignore optional 'typename'.
316  // FIXME: This is wrong; we should parse this as a typename-specifier.
317  if (Tok.is(tok::kw_typename)) {
318    TypenameLoc = Tok.getLocation();
319    ConsumeToken();
320    IsTypeName = true;
321  }
322  else
323    IsTypeName = false;
324
325  // Parse nested-name-specifier.
326  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
327
328  AttributeList *AttrList = 0;
329
330  // Check nested-name specifier.
331  if (SS.isInvalid()) {
332    SkipUntil(tok::semi);
333    return DeclPtrTy();
334  }
335
336  // Parse the unqualified-id. We allow parsing of both constructor and
337  // destructor names and allow the action module to diagnose any semantic
338  // errors.
339  UnqualifiedId Name;
340  if (ParseUnqualifiedId(SS,
341                         /*EnteringContext=*/false,
342                         /*AllowDestructorName=*/true,
343                         /*AllowConstructorName=*/true,
344                         /*ObjectType=*/0,
345                         Name)) {
346    SkipUntil(tok::semi);
347    return DeclPtrTy();
348  }
349
350  // Parse (optional) attributes (most likely GNU strong-using extension).
351  if (Tok.is(tok::kw___attribute))
352    AttrList = ParseGNUAttributes();
353
354  // Eat ';'.
355  DeclEnd = Tok.getLocation();
356  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
357                   AttrList ? "attributes list" : "using declaration",
358                   tok::semi);
359
360  return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name,
361                                       AttrList, IsTypeName, TypenameLoc);
362}
363
364/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
365///
366///      static_assert-declaration:
367///        static_assert ( constant-expression  ,  string-literal  ) ;
368///
369Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
370  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
371  SourceLocation StaticAssertLoc = ConsumeToken();
372
373  if (Tok.isNot(tok::l_paren)) {
374    Diag(Tok, diag::err_expected_lparen);
375    return DeclPtrTy();
376  }
377
378  SourceLocation LParenLoc = ConsumeParen();
379
380  OwningExprResult AssertExpr(ParseConstantExpression());
381  if (AssertExpr.isInvalid()) {
382    SkipUntil(tok::semi);
383    return DeclPtrTy();
384  }
385
386  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
387    return DeclPtrTy();
388
389  if (Tok.isNot(tok::string_literal)) {
390    Diag(Tok, diag::err_expected_string_literal);
391    SkipUntil(tok::semi);
392    return DeclPtrTy();
393  }
394
395  OwningExprResult AssertMessage(ParseStringLiteralExpression());
396  if (AssertMessage.isInvalid())
397    return DeclPtrTy();
398
399  MatchRHSPunctuation(tok::r_paren, LParenLoc);
400
401  DeclEnd = Tok.getLocation();
402  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
403
404  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
405                                              move(AssertMessage));
406}
407
408/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
409///
410/// 'decltype' ( expression )
411///
412void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
413  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
414
415  SourceLocation StartLoc = ConsumeToken();
416  SourceLocation LParenLoc = Tok.getLocation();
417
418  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
419                       "decltype")) {
420    SkipUntil(tok::r_paren);
421    return;
422  }
423
424  // Parse the expression
425
426  // C++0x [dcl.type.simple]p4:
427  //   The operand of the decltype specifier is an unevaluated operand.
428  EnterExpressionEvaluationContext Unevaluated(Actions,
429                                               Action::Unevaluated);
430  OwningExprResult Result = ParseExpression();
431  if (Result.isInvalid()) {
432    SkipUntil(tok::r_paren);
433    return;
434  }
435
436  // Match the ')'
437  SourceLocation RParenLoc;
438  if (Tok.is(tok::r_paren))
439    RParenLoc = ConsumeParen();
440  else
441    MatchRHSPunctuation(tok::r_paren, LParenLoc);
442
443  if (RParenLoc.isInvalid())
444    return;
445
446  const char *PrevSpec = 0;
447  unsigned DiagID;
448  // Check for duplicate type specifiers (e.g. "int decltype(a)").
449  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
450                         DiagID, Result.release()))
451    Diag(StartLoc, DiagID) << PrevSpec;
452}
453
454/// ParseClassName - Parse a C++ class-name, which names a class. Note
455/// that we only check that the result names a type; semantic analysis
456/// will need to verify that the type names a class. The result is
457/// either a type or NULL, depending on whether a type name was
458/// found.
459///
460///       class-name: [C++ 9.1]
461///         identifier
462///         simple-template-id
463///
464Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
465                                          const CXXScopeSpec *SS,
466                                          bool DestrExpected) {
467  // Check whether we have a template-id that names a type.
468  if (Tok.is(tok::annot_template_id)) {
469    TemplateIdAnnotation *TemplateId
470      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
471    if (TemplateId->Kind == TNK_Type_template) {
472      AnnotateTemplateIdTokenAsType(SS);
473
474      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
475      TypeTy *Type = Tok.getAnnotationValue();
476      EndLocation = Tok.getAnnotationEndLoc();
477      ConsumeToken();
478
479      if (Type)
480        return Type;
481      return true;
482    }
483
484    // Fall through to produce an error below.
485  }
486
487  if (Tok.isNot(tok::identifier)) {
488    Diag(Tok, diag::err_expected_class_name);
489    return true;
490  }
491
492  // We have an identifier; check whether it is actually a type.
493  TypeTy *Type = Actions.getTypeName(*Tok.getIdentifierInfo(),
494                                     Tok.getLocation(), CurScope, SS,
495                                     true);
496  if (!Type) {
497    Diag(Tok, DestrExpected ? diag::err_destructor_class_name
498                            : diag::err_expected_class_name);
499    return true;
500  }
501
502  // Consume the identifier.
503  EndLocation = ConsumeToken();
504  return Type;
505}
506
507/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
508/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
509/// until we reach the start of a definition or see a token that
510/// cannot start a definition.
511///
512///       class-specifier: [C++ class]
513///         class-head '{' member-specification[opt] '}'
514///         class-head '{' member-specification[opt] '}' attributes[opt]
515///       class-head:
516///         class-key identifier[opt] base-clause[opt]
517///         class-key nested-name-specifier identifier base-clause[opt]
518///         class-key nested-name-specifier[opt] simple-template-id
519///                          base-clause[opt]
520/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
521/// [GNU]   class-key attributes[opt] nested-name-specifier
522///                          identifier base-clause[opt]
523/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
524///                          simple-template-id base-clause[opt]
525///       class-key:
526///         'class'
527///         'struct'
528///         'union'
529///
530///       elaborated-type-specifier: [C++ dcl.type.elab]
531///         class-key ::[opt] nested-name-specifier[opt] identifier
532///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
533///                          simple-template-id
534///
535///  Note that the C++ class-specifier and elaborated-type-specifier,
536///  together, subsume the C99 struct-or-union-specifier:
537///
538///       struct-or-union-specifier: [C99 6.7.2.1]
539///         struct-or-union identifier[opt] '{' struct-contents '}'
540///         struct-or-union identifier
541/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
542///                                                         '}' attributes[opt]
543/// [GNU]   struct-or-union attributes[opt] identifier
544///       struct-or-union:
545///         'struct'
546///         'union'
547void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
548                                 SourceLocation StartLoc, DeclSpec &DS,
549                                 const ParsedTemplateInfo &TemplateInfo,
550                                 AccessSpecifier AS) {
551  DeclSpec::TST TagType;
552  if (TagTokKind == tok::kw_struct)
553    TagType = DeclSpec::TST_struct;
554  else if (TagTokKind == tok::kw_class)
555    TagType = DeclSpec::TST_class;
556  else {
557    assert(TagTokKind == tok::kw_union && "Not a class specifier");
558    TagType = DeclSpec::TST_union;
559  }
560
561  if (Tok.is(tok::code_completion)) {
562    // Code completion for a struct, class, or union name.
563    Actions.CodeCompleteTag(CurScope, TagType);
564    ConsumeToken();
565  }
566
567  AttributeList *AttrList = 0;
568  // If attributes exist after tag, parse them.
569  if (Tok.is(tok::kw___attribute))
570    AttrList = ParseGNUAttributes();
571
572  // If declspecs exist after tag, parse them.
573  if (Tok.is(tok::kw___declspec))
574    AttrList = ParseMicrosoftDeclSpec(AttrList);
575
576  // If C++0x attributes exist here, parse them.
577  // FIXME: Are we consistent with the ordering of parsing of different
578  // styles of attributes?
579  if (isCXX0XAttributeSpecifier())
580    AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
581
582  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
583    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
584    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
585    // token sequence "struct __is_pod", make __is_pod into a normal
586    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
587    // properly.
588    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
589    Tok.setKind(tok::identifier);
590  }
591
592  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
593    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
594    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
595    // token sequence "struct __is_empty", make __is_empty into a normal
596    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
597    // properly.
598    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
599    Tok.setKind(tok::identifier);
600  }
601
602  // Parse the (optional) nested-name-specifier.
603  CXXScopeSpec &SS = DS.getTypeSpecScope();
604  if (getLang().CPlusPlus) {
605    // "FOO : BAR" is not a potential typo for "FOO::BAR".
606    ColonProtectionRAIIObject X(*this);
607
608    if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true))
609      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
610        Diag(Tok, diag::err_expected_ident);
611  }
612
613  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
614
615  // Parse the (optional) class name or simple-template-id.
616  IdentifierInfo *Name = 0;
617  SourceLocation NameLoc;
618  TemplateIdAnnotation *TemplateId = 0;
619  if (Tok.is(tok::identifier)) {
620    Name = Tok.getIdentifierInfo();
621    NameLoc = ConsumeToken();
622
623    if (Tok.is(tok::less)) {
624      // The name was supposed to refer to a template, but didn't.
625      // Eat the template argument list and try to continue parsing this as
626      // a class (or template thereof).
627      TemplateArgList TemplateArgs;
628      SourceLocation LAngleLoc, RAngleLoc;
629      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
630                                           true, LAngleLoc,
631                                           TemplateArgs, RAngleLoc)) {
632        // We couldn't parse the template argument list at all, so don't
633        // try to give any location information for the list.
634        LAngleLoc = RAngleLoc = SourceLocation();
635      }
636
637      Diag(NameLoc, diag::err_explicit_spec_non_template)
638        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
639        << (TagType == DeclSpec::TST_class? 0
640            : TagType == DeclSpec::TST_struct? 1
641            : 2)
642        << Name
643        << SourceRange(LAngleLoc, RAngleLoc);
644
645      // Strip off the last template parameter list if it was empty, since
646      // we've removed its template argument list.
647      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
648        if (TemplateParams && TemplateParams->size() > 1) {
649          TemplateParams->pop_back();
650        } else {
651          TemplateParams = 0;
652          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
653            = ParsedTemplateInfo::NonTemplate;
654        }
655      } else if (TemplateInfo.Kind
656                                == ParsedTemplateInfo::ExplicitInstantiation) {
657        // Pretend this is just a forward declaration.
658        TemplateParams = 0;
659        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
660          = ParsedTemplateInfo::NonTemplate;
661        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
662          = SourceLocation();
663        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
664          = SourceLocation();
665      }
666
667
668    }
669  } else if (Tok.is(tok::annot_template_id)) {
670    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
671    NameLoc = ConsumeToken();
672
673    if (TemplateId->Kind != TNK_Type_template) {
674      // The template-name in the simple-template-id refers to
675      // something other than a class template. Give an appropriate
676      // error message and skip to the ';'.
677      SourceRange Range(NameLoc);
678      if (SS.isNotEmpty())
679        Range.setBegin(SS.getBeginLoc());
680
681      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
682        << Name << static_cast<int>(TemplateId->Kind) << Range;
683
684      DS.SetTypeSpecError();
685      SkipUntil(tok::semi, false, true);
686      TemplateId->Destroy();
687      return;
688    }
689  }
690
691  // There are four options here.  If we have 'struct foo;', then this
692  // is either a forward declaration or a friend declaration, which
693  // have to be treated differently.  If we have 'struct foo {...' or
694  // 'struct foo :...' then this is a definition. Otherwise we have
695  // something like 'struct foo xyz', a reference.
696  Action::TagUseKind TUK;
697  if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))) {
698    if (DS.isFriendSpecified()) {
699      // C++ [class.friend]p2:
700      //   A class shall not be defined in a friend declaration.
701      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
702        << SourceRange(DS.getFriendSpecLoc());
703
704      // Skip everything up to the semicolon, so that this looks like a proper
705      // friend class (or template thereof) declaration.
706      SkipUntil(tok::semi, true, true);
707      TUK = Action::TUK_Friend;
708    } else {
709      // Okay, this is a class definition.
710      TUK = Action::TUK_Definition;
711    }
712  } else if (Tok.is(tok::semi))
713    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
714  else
715    TUK = Action::TUK_Reference;
716
717  if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
718    // We have a declaration or reference to an anonymous class.
719    Diag(StartLoc, diag::err_anon_type_definition)
720      << DeclSpec::getSpecifierName(TagType);
721
722    SkipUntil(tok::comma, true);
723
724    if (TemplateId)
725      TemplateId->Destroy();
726    return;
727  }
728
729  // Create the tag portion of the class or class template.
730  Action::DeclResult TagOrTempResult = true; // invalid
731  Action::TypeResult TypeResult = true; // invalid
732
733  // FIXME: When TUK == TUK_Reference and we have a template-id, we need
734  // to turn that template-id into a type.
735
736  bool Owned = false;
737  if (TemplateId) {
738    // Explicit specialization, class template partial specialization,
739    // or explicit instantiation.
740    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
741                                       TemplateId->getTemplateArgs(),
742                                       TemplateId->NumArgs);
743    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
744        TUK == Action::TUK_Declaration) {
745      // This is an explicit instantiation of a class template.
746      TagOrTempResult
747        = Actions.ActOnExplicitInstantiation(CurScope,
748                                             TemplateInfo.ExternLoc,
749                                             TemplateInfo.TemplateLoc,
750                                             TagType,
751                                             StartLoc,
752                                             SS,
753                                     TemplateTy::make(TemplateId->Template),
754                                             TemplateId->TemplateNameLoc,
755                                             TemplateId->LAngleLoc,
756                                             TemplateArgsPtr,
757                                             TemplateId->RAngleLoc,
758                                             AttrList);
759    } else if (TUK == Action::TUK_Reference) {
760      TypeResult
761        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
762                                      TemplateId->TemplateNameLoc,
763                                      TemplateId->LAngleLoc,
764                                      TemplateArgsPtr,
765                                      TemplateId->RAngleLoc);
766
767      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
768                                                  TagType, StartLoc);
769    } else {
770      // This is an explicit specialization or a class template
771      // partial specialization.
772      TemplateParameterLists FakedParamLists;
773
774      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
775        // This looks like an explicit instantiation, because we have
776        // something like
777        //
778        //   template class Foo<X>
779        //
780        // but it actually has a definition. Most likely, this was
781        // meant to be an explicit specialization, but the user forgot
782        // the '<>' after 'template'.
783        assert(TUK == Action::TUK_Definition && "Expected a definition here");
784
785        SourceLocation LAngleLoc
786          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
787        Diag(TemplateId->TemplateNameLoc,
788             diag::err_explicit_instantiation_with_definition)
789          << SourceRange(TemplateInfo.TemplateLoc)
790          << CodeModificationHint::CreateInsertion(LAngleLoc, "<>");
791
792        // Create a fake template parameter list that contains only
793        // "template<>", so that we treat this construct as a class
794        // template specialization.
795        FakedParamLists.push_back(
796          Actions.ActOnTemplateParameterList(0, SourceLocation(),
797                                             TemplateInfo.TemplateLoc,
798                                             LAngleLoc,
799                                             0, 0,
800                                             LAngleLoc));
801        TemplateParams = &FakedParamLists;
802      }
803
804      // Build the class template specialization.
805      TagOrTempResult
806        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
807                       StartLoc, SS,
808                       TemplateTy::make(TemplateId->Template),
809                       TemplateId->TemplateNameLoc,
810                       TemplateId->LAngleLoc,
811                       TemplateArgsPtr,
812                       TemplateId->RAngleLoc,
813                       AttrList,
814                       Action::MultiTemplateParamsArg(Actions,
815                                    TemplateParams? &(*TemplateParams)[0] : 0,
816                                 TemplateParams? TemplateParams->size() : 0));
817    }
818    TemplateId->Destroy();
819  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
820             TUK == Action::TUK_Declaration) {
821    // Explicit instantiation of a member of a class template
822    // specialization, e.g.,
823    //
824    //   template struct Outer<int>::Inner;
825    //
826    TagOrTempResult
827      = Actions.ActOnExplicitInstantiation(CurScope,
828                                           TemplateInfo.ExternLoc,
829                                           TemplateInfo.TemplateLoc,
830                                           TagType, StartLoc, SS, Name,
831                                           NameLoc, AttrList);
832  } else {
833    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
834        TUK == Action::TUK_Definition) {
835      // FIXME: Diagnose this particular error.
836    }
837
838    bool IsDependent = false;
839
840    // Declaration or definition of a class type
841    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
842                                       Name, NameLoc, AttrList, AS,
843                                  Action::MultiTemplateParamsArg(Actions,
844                                    TemplateParams? &(*TemplateParams)[0] : 0,
845                                    TemplateParams? TemplateParams->size() : 0),
846                                       Owned, IsDependent);
847
848    // If ActOnTag said the type was dependent, try again with the
849    // less common call.
850    if (IsDependent)
851      TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
852                                             SS, Name, StartLoc, NameLoc);
853  }
854
855  // If there is a body, parse it and inform the actions module.
856  if (TUK == Action::TUK_Definition) {
857    assert(Tok.is(tok::l_brace) ||
858           (getLang().CPlusPlus && Tok.is(tok::colon)));
859    if (getLang().CPlusPlus)
860      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
861    else
862      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
863  }
864
865  void *Result;
866  if (!TypeResult.isInvalid()) {
867    TagType = DeclSpec::TST_typename;
868    Result = TypeResult.get();
869    Owned = false;
870  } else if (!TagOrTempResult.isInvalid()) {
871    Result = TagOrTempResult.get().getAs<void>();
872  } else {
873    DS.SetTypeSpecError();
874    return;
875  }
876
877  const char *PrevSpec = 0;
878  unsigned DiagID;
879
880  if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, DiagID,
881                         Result, Owned))
882    Diag(StartLoc, DiagID) << PrevSpec;
883}
884
885/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
886///
887///       base-clause : [C++ class.derived]
888///         ':' base-specifier-list
889///       base-specifier-list:
890///         base-specifier '...'[opt]
891///         base-specifier-list ',' base-specifier '...'[opt]
892void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
893  assert(Tok.is(tok::colon) && "Not a base clause");
894  ConsumeToken();
895
896  // Build up an array of parsed base specifiers.
897  llvm::SmallVector<BaseTy *, 8> BaseInfo;
898
899  while (true) {
900    // Parse a base-specifier.
901    BaseResult Result = ParseBaseSpecifier(ClassDecl);
902    if (Result.isInvalid()) {
903      // Skip the rest of this base specifier, up until the comma or
904      // opening brace.
905      SkipUntil(tok::comma, tok::l_brace, true, true);
906    } else {
907      // Add this to our array of base specifiers.
908      BaseInfo.push_back(Result.get());
909    }
910
911    // If the next token is a comma, consume it and keep reading
912    // base-specifiers.
913    if (Tok.isNot(tok::comma)) break;
914
915    // Consume the comma.
916    ConsumeToken();
917  }
918
919  // Attach the base specifiers
920  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
921}
922
923/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
924/// one entry in the base class list of a class specifier, for example:
925///    class foo : public bar, virtual private baz {
926/// 'public bar' and 'virtual private baz' are each base-specifiers.
927///
928///       base-specifier: [C++ class.derived]
929///         ::[opt] nested-name-specifier[opt] class-name
930///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
931///                        class-name
932///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
933///                        class-name
934Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
935  bool IsVirtual = false;
936  SourceLocation StartLoc = Tok.getLocation();
937
938  // Parse the 'virtual' keyword.
939  if (Tok.is(tok::kw_virtual))  {
940    ConsumeToken();
941    IsVirtual = true;
942  }
943
944  // Parse an (optional) access specifier.
945  AccessSpecifier Access = getAccessSpecifierIfPresent();
946  if (Access)
947    ConsumeToken();
948
949  // Parse the 'virtual' keyword (again!), in case it came after the
950  // access specifier.
951  if (Tok.is(tok::kw_virtual))  {
952    SourceLocation VirtualLoc = ConsumeToken();
953    if (IsVirtual) {
954      // Complain about duplicate 'virtual'
955      Diag(VirtualLoc, diag::err_dup_virtual)
956        << CodeModificationHint::CreateRemoval(VirtualLoc);
957    }
958
959    IsVirtual = true;
960  }
961
962  // Parse optional '::' and optional nested-name-specifier.
963  CXXScopeSpec SS;
964  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true);
965
966  // The location of the base class itself.
967  SourceLocation BaseLoc = Tok.getLocation();
968
969  // Parse the class-name.
970  SourceLocation EndLocation;
971  TypeResult BaseType = ParseClassName(EndLocation, &SS);
972  if (BaseType.isInvalid())
973    return true;
974
975  // Find the complete source range for the base-specifier.
976  SourceRange Range(StartLoc, EndLocation);
977
978  // Notify semantic analysis that we have parsed a complete
979  // base-specifier.
980  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
981                                    BaseType.get(), BaseLoc);
982}
983
984/// getAccessSpecifierIfPresent - Determine whether the next token is
985/// a C++ access-specifier.
986///
987///       access-specifier: [C++ class.derived]
988///         'private'
989///         'protected'
990///         'public'
991AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
992  switch (Tok.getKind()) {
993  default: return AS_none;
994  case tok::kw_private: return AS_private;
995  case tok::kw_protected: return AS_protected;
996  case tok::kw_public: return AS_public;
997  }
998}
999
1000void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1001                                             DeclPtrTy ThisDecl) {
1002  // We just declared a member function. If this member function
1003  // has any default arguments, we'll need to parse them later.
1004  LateParsedMethodDeclaration *LateMethod = 0;
1005  DeclaratorChunk::FunctionTypeInfo &FTI
1006    = DeclaratorInfo.getTypeObject(0).Fun;
1007  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1008    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1009      if (!LateMethod) {
1010        // Push this method onto the stack of late-parsed method
1011        // declarations.
1012        getCurrentClass().MethodDecls.push_back(
1013                                LateParsedMethodDeclaration(ThisDecl));
1014        LateMethod = &getCurrentClass().MethodDecls.back();
1015        LateMethod->TemplateScope = CurScope->isTemplateParamScope();
1016
1017        // Add all of the parameters prior to this one (they don't
1018        // have default arguments).
1019        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1020        for (unsigned I = 0; I < ParamIdx; ++I)
1021          LateMethod->DefaultArgs.push_back(
1022                    LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
1023      }
1024
1025      // Add this parameter to the list of parameters (it or may
1026      // not have a default argument).
1027      LateMethod->DefaultArgs.push_back(
1028        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1029                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1030    }
1031  }
1032}
1033
1034/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1035///
1036///       member-declaration:
1037///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1038///         function-definition ';'[opt]
1039///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1040///         using-declaration                                            [TODO]
1041/// [C++0x] static_assert-declaration
1042///         template-declaration
1043/// [GNU]   '__extension__' member-declaration
1044///
1045///       member-declarator-list:
1046///         member-declarator
1047///         member-declarator-list ',' member-declarator
1048///
1049///       member-declarator:
1050///         declarator pure-specifier[opt]
1051///         declarator constant-initializer[opt]
1052///         identifier[opt] ':' constant-expression
1053///
1054///       pure-specifier:
1055///         '= 0'
1056///
1057///       constant-initializer:
1058///         '=' constant-expression
1059///
1060void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1061                                       const ParsedTemplateInfo &TemplateInfo) {
1062  // Access declarations.
1063  if (!TemplateInfo.Kind &&
1064      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1065      TryAnnotateCXXScopeToken() &&
1066      Tok.is(tok::annot_cxxscope)) {
1067    bool isAccessDecl = false;
1068    if (NextToken().is(tok::identifier))
1069      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1070    else
1071      isAccessDecl = NextToken().is(tok::kw_operator);
1072
1073    if (isAccessDecl) {
1074      // Collect the scope specifier token we annotated earlier.
1075      CXXScopeSpec SS;
1076      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
1077
1078      // Try to parse an unqualified-id.
1079      UnqualifiedId Name;
1080      if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
1081        SkipUntil(tok::semi);
1082        return;
1083      }
1084
1085      // TODO: recover from mistakenly-qualified operator declarations.
1086      if (ExpectAndConsume(tok::semi,
1087                           diag::err_expected_semi_after,
1088                           "access declaration",
1089                           tok::semi))
1090        return;
1091
1092      Actions.ActOnUsingDeclaration(CurScope, AS,
1093                                    false, SourceLocation(),
1094                                    SS, Name,
1095                                    /* AttrList */ 0,
1096                                    /* IsTypeName */ false,
1097                                    SourceLocation());
1098      return;
1099    }
1100  }
1101
1102  // static_assert-declaration
1103  if (Tok.is(tok::kw_static_assert)) {
1104    // FIXME: Check for templates
1105    SourceLocation DeclEnd;
1106    ParseStaticAssertDeclaration(DeclEnd);
1107    return;
1108  }
1109
1110  if (Tok.is(tok::kw_template)) {
1111    assert(!TemplateInfo.TemplateParams &&
1112           "Nested template improperly parsed?");
1113    SourceLocation DeclEnd;
1114    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1115                                         AS);
1116    return;
1117  }
1118
1119  // Handle:  member-declaration ::= '__extension__' member-declaration
1120  if (Tok.is(tok::kw___extension__)) {
1121    // __extension__ silences extension warnings in the subexpression.
1122    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1123    ConsumeToken();
1124    return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
1125  }
1126
1127  // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1128  ColonProtectionRAIIObject X(*this);
1129
1130  CXX0XAttributeList AttrList;
1131  // Optional C++0x attribute-specifier
1132  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1133    AttrList = ParseCXX0XAttributes();
1134
1135  if (Tok.is(tok::kw_using)) {
1136    // FIXME: Check for template aliases
1137
1138    if (AttrList.HasAttr)
1139      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1140        << AttrList.Range;
1141
1142    // Eat 'using'.
1143    SourceLocation UsingLoc = ConsumeToken();
1144
1145    if (Tok.is(tok::kw_namespace)) {
1146      Diag(UsingLoc, diag::err_using_namespace_in_class);
1147      SkipUntil(tok::semi, true, true);
1148    }
1149    else {
1150      SourceLocation DeclEnd;
1151      // Otherwise, it must be using-declaration.
1152      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1153    }
1154    return;
1155  }
1156
1157  SourceLocation DSStart = Tok.getLocation();
1158  // decl-specifier-seq:
1159  // Parse the common declaration-specifiers piece.
1160  ParsingDeclSpec DS(*this);
1161  DS.AddAttributes(AttrList.AttrList);
1162  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1163
1164  Action::MultiTemplateParamsArg TemplateParams(Actions,
1165      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1166      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1167
1168  if (Tok.is(tok::semi)) {
1169    ConsumeToken();
1170    Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1171    return;
1172  }
1173
1174  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1175
1176  if (Tok.isNot(tok::colon)) {
1177    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1178    ColonProtectionRAIIObject X(*this);
1179
1180    // Parse the first declarator.
1181    ParseDeclarator(DeclaratorInfo);
1182    // Error parsing the declarator?
1183    if (!DeclaratorInfo.hasName()) {
1184      // If so, skip until the semi-colon or a }.
1185      SkipUntil(tok::r_brace, true);
1186      if (Tok.is(tok::semi))
1187        ConsumeToken();
1188      return;
1189    }
1190
1191    // If attributes exist after the declarator, but before an '{', parse them.
1192    if (Tok.is(tok::kw___attribute)) {
1193      SourceLocation Loc;
1194      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1195      DeclaratorInfo.AddAttributes(AttrList, Loc);
1196    }
1197
1198    // function-definition:
1199    if (Tok.is(tok::l_brace)
1200        || (DeclaratorInfo.isFunctionDeclarator() &&
1201            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1202      if (!DeclaratorInfo.isFunctionDeclarator()) {
1203        Diag(Tok, diag::err_func_def_no_params);
1204        ConsumeBrace();
1205        SkipUntil(tok::r_brace, true);
1206        return;
1207      }
1208
1209      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1210        Diag(Tok, diag::err_function_declared_typedef);
1211        // This recovery skips the entire function body. It would be nice
1212        // to simply call ParseCXXInlineMethodDef() below, however Sema
1213        // assumes the declarator represents a function, not a typedef.
1214        ConsumeBrace();
1215        SkipUntil(tok::r_brace, true);
1216        return;
1217      }
1218
1219      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1220      return;
1221    }
1222  }
1223
1224  // member-declarator-list:
1225  //   member-declarator
1226  //   member-declarator-list ',' member-declarator
1227
1228  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1229  OwningExprResult BitfieldSize(Actions);
1230  OwningExprResult Init(Actions);
1231  bool Deleted = false;
1232
1233  while (1) {
1234    // member-declarator:
1235    //   declarator pure-specifier[opt]
1236    //   declarator constant-initializer[opt]
1237    //   identifier[opt] ':' constant-expression
1238
1239    if (Tok.is(tok::colon)) {
1240      ConsumeToken();
1241      BitfieldSize = ParseConstantExpression();
1242      if (BitfieldSize.isInvalid())
1243        SkipUntil(tok::comma, true, true);
1244    }
1245
1246    // pure-specifier:
1247    //   '= 0'
1248    //
1249    // constant-initializer:
1250    //   '=' constant-expression
1251    //
1252    // defaulted/deleted function-definition:
1253    //   '=' 'default'                          [TODO]
1254    //   '=' 'delete'
1255
1256    if (Tok.is(tok::equal)) {
1257      ConsumeToken();
1258      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1259        ConsumeToken();
1260        Deleted = true;
1261      } else {
1262        Init = ParseInitializer();
1263        if (Init.isInvalid())
1264          SkipUntil(tok::comma, true, true);
1265      }
1266    }
1267
1268    // If attributes exist after the declarator, parse them.
1269    if (Tok.is(tok::kw___attribute)) {
1270      SourceLocation Loc;
1271      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1272      DeclaratorInfo.AddAttributes(AttrList, Loc);
1273    }
1274
1275    // NOTE: If Sema is the Action module and declarator is an instance field,
1276    // this call will *not* return the created decl; It will return null.
1277    // See Sema::ActOnCXXMemberDeclarator for details.
1278
1279    DeclPtrTy ThisDecl;
1280    if (DS.isFriendSpecified()) {
1281      // TODO: handle initializers, bitfields, 'delete'
1282      ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
1283                                                 /*IsDefinition*/ false,
1284                                                 move(TemplateParams));
1285    } else {
1286      ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1287                                                  DeclaratorInfo,
1288                                                  move(TemplateParams),
1289                                                  BitfieldSize.release(),
1290                                                  Init.release(),
1291                                                  /*IsDefinition*/Deleted,
1292                                                  Deleted);
1293    }
1294    if (ThisDecl)
1295      DeclsInGroup.push_back(ThisDecl);
1296
1297    if (DeclaratorInfo.isFunctionDeclarator() &&
1298        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1299          != DeclSpec::SCS_typedef) {
1300      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1301    }
1302
1303    DeclaratorInfo.complete(ThisDecl);
1304
1305    // If we don't have a comma, it is either the end of the list (a ';')
1306    // or an error, bail out.
1307    if (Tok.isNot(tok::comma))
1308      break;
1309
1310    // Consume the comma.
1311    ConsumeToken();
1312
1313    // Parse the next declarator.
1314    DeclaratorInfo.clear();
1315    BitfieldSize = 0;
1316    Init = 0;
1317    Deleted = false;
1318
1319    // Attributes are only allowed on the second declarator.
1320    if (Tok.is(tok::kw___attribute)) {
1321      SourceLocation Loc;
1322      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1323      DeclaratorInfo.AddAttributes(AttrList, Loc);
1324    }
1325
1326    if (Tok.isNot(tok::colon))
1327      ParseDeclarator(DeclaratorInfo);
1328  }
1329
1330  if (Tok.is(tok::semi)) {
1331    ConsumeToken();
1332    Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1333                                    DeclsInGroup.size());
1334    return;
1335  }
1336
1337  Diag(Tok, diag::err_expected_semi_decl_list);
1338  // Skip to end of block or statement
1339  SkipUntil(tok::r_brace, true, true);
1340  if (Tok.is(tok::semi))
1341    ConsumeToken();
1342  return;
1343}
1344
1345/// ParseCXXMemberSpecification - Parse the class definition.
1346///
1347///       member-specification:
1348///         member-declaration member-specification[opt]
1349///         access-specifier ':' member-specification[opt]
1350///
1351void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1352                                         unsigned TagType, DeclPtrTy TagDecl) {
1353  assert((TagType == DeclSpec::TST_struct ||
1354         TagType == DeclSpec::TST_union  ||
1355         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1356
1357  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1358                                        PP.getSourceManager(),
1359                                        "parsing struct/union/class body");
1360
1361  // Determine whether this is a top-level (non-nested) class.
1362  bool TopLevelClass = ClassStack.empty() ||
1363    CurScope->isInCXXInlineMethodScope();
1364
1365  // Enter a scope for the class.
1366  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1367
1368  // Note that we are parsing a new (potentially-nested) class definition.
1369  ParsingClassDefinition ParsingDef(*this, TagDecl, TopLevelClass);
1370
1371  if (TagDecl)
1372    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1373
1374  if (Tok.is(tok::colon)) {
1375    ParseBaseClause(TagDecl);
1376
1377    if (!Tok.is(tok::l_brace)) {
1378      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1379      return;
1380    }
1381  }
1382
1383  assert(Tok.is(tok::l_brace));
1384
1385  SourceLocation LBraceLoc = ConsumeBrace();
1386
1387  if (!TagDecl) {
1388    SkipUntil(tok::r_brace, false, false);
1389    return;
1390  }
1391
1392  Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc);
1393
1394  // C++ 11p3: Members of a class defined with the keyword class are private
1395  // by default. Members of a class defined with the keywords struct or union
1396  // are public by default.
1397  AccessSpecifier CurAS;
1398  if (TagType == DeclSpec::TST_class)
1399    CurAS = AS_private;
1400  else
1401    CurAS = AS_public;
1402
1403  // While we still have something to read, read the member-declarations.
1404  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1405    // Each iteration of this loop reads one member-declaration.
1406
1407    // Check for extraneous top-level semicolon.
1408    if (Tok.is(tok::semi)) {
1409      Diag(Tok, diag::ext_extra_struct_semi)
1410        << CodeModificationHint::CreateRemoval(Tok.getLocation());
1411      ConsumeToken();
1412      continue;
1413    }
1414
1415    AccessSpecifier AS = getAccessSpecifierIfPresent();
1416    if (AS != AS_none) {
1417      // Current token is a C++ access specifier.
1418      CurAS = AS;
1419      ConsumeToken();
1420      ExpectAndConsume(tok::colon, diag::err_expected_colon);
1421      continue;
1422    }
1423
1424    // FIXME: Make sure we don't have a template here.
1425
1426    // Parse all the comma separated declarators.
1427    ParseCXXClassMemberDeclaration(CurAS);
1428  }
1429
1430  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1431
1432  AttributeList *AttrList = 0;
1433  // If attributes exist after class contents, parse them.
1434  if (Tok.is(tok::kw___attribute))
1435    AttrList = ParseGNUAttributes(); // FIXME: where should I put them?
1436
1437  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1438                                            LBraceLoc, RBraceLoc);
1439
1440  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1441  // complete within function bodies, default arguments,
1442  // exception-specifications, and constructor ctor-initializers (including
1443  // such things in nested classes).
1444  //
1445  // FIXME: Only function bodies and constructor ctor-initializers are
1446  // parsed correctly, fix the rest.
1447  if (TopLevelClass) {
1448    // We are not inside a nested class. This class and its nested classes
1449    // are complete and we can parse the delayed portions of method
1450    // declarations and the lexed inline method definitions.
1451    ParseLexedMethodDeclarations(getCurrentClass());
1452    ParseLexedMethodDefs(getCurrentClass());
1453  }
1454
1455  // Leave the class scope.
1456  ParsingDef.Pop();
1457  ClassScope.Exit();
1458
1459  Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1460}
1461
1462/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1463/// which explicitly initializes the members or base classes of a
1464/// class (C++ [class.base.init]). For example, the three initializers
1465/// after the ':' in the Derived constructor below:
1466///
1467/// @code
1468/// class Base { };
1469/// class Derived : Base {
1470///   int x;
1471///   float f;
1472/// public:
1473///   Derived(float f) : Base(), x(17), f(f) { }
1474/// };
1475/// @endcode
1476///
1477/// [C++]  ctor-initializer:
1478///          ':' mem-initializer-list
1479///
1480/// [C++]  mem-initializer-list:
1481///          mem-initializer
1482///          mem-initializer , mem-initializer-list
1483void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1484  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1485
1486  SourceLocation ColonLoc = ConsumeToken();
1487
1488  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1489
1490  do {
1491    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1492    if (!MemInit.isInvalid())
1493      MemInitializers.push_back(MemInit.get());
1494
1495    if (Tok.is(tok::comma))
1496      ConsumeToken();
1497    else if (Tok.is(tok::l_brace))
1498      break;
1499    else {
1500      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1501      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1502      SkipUntil(tok::l_brace, true, true);
1503      break;
1504    }
1505  } while (true);
1506
1507  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1508                               MemInitializers.data(), MemInitializers.size());
1509}
1510
1511/// ParseMemInitializer - Parse a C++ member initializer, which is
1512/// part of a constructor initializer that explicitly initializes one
1513/// member or base class (C++ [class.base.init]). See
1514/// ParseConstructorInitializer for an example.
1515///
1516/// [C++] mem-initializer:
1517///         mem-initializer-id '(' expression-list[opt] ')'
1518///
1519/// [C++] mem-initializer-id:
1520///         '::'[opt] nested-name-specifier[opt] class-name
1521///         identifier
1522Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1523  // parse '::'[opt] nested-name-specifier[opt]
1524  CXXScopeSpec SS;
1525  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1526  TypeTy *TemplateTypeTy = 0;
1527  if (Tok.is(tok::annot_template_id)) {
1528    TemplateIdAnnotation *TemplateId
1529      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1530    if (TemplateId->Kind == TNK_Type_template) {
1531      AnnotateTemplateIdTokenAsType(&SS);
1532      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1533      TemplateTypeTy = Tok.getAnnotationValue();
1534    }
1535    // FIXME. May need to check for TNK_Dependent_template as well.
1536  }
1537  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1538    Diag(Tok, diag::err_expected_member_or_base_name);
1539    return true;
1540  }
1541
1542  // Get the identifier. This may be a member name or a class name,
1543  // but we'll let the semantic analysis determine which it is.
1544  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1545  SourceLocation IdLoc = ConsumeToken();
1546
1547  // Parse the '('.
1548  if (Tok.isNot(tok::l_paren)) {
1549    Diag(Tok, diag::err_expected_lparen);
1550    return true;
1551  }
1552  SourceLocation LParenLoc = ConsumeParen();
1553
1554  // Parse the optional expression-list.
1555  ExprVector ArgExprs(Actions);
1556  CommaLocsTy CommaLocs;
1557  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1558    SkipUntil(tok::r_paren);
1559    return true;
1560  }
1561
1562  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1563
1564  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1565                                     TemplateTypeTy, IdLoc,
1566                                     LParenLoc, ArgExprs.take(),
1567                                     ArgExprs.size(), CommaLocs.data(),
1568                                     RParenLoc);
1569}
1570
1571/// ParseExceptionSpecification - Parse a C++ exception-specification
1572/// (C++ [except.spec]).
1573///
1574///       exception-specification:
1575///         'throw' '(' type-id-list [opt] ')'
1576/// [MS]    'throw' '(' '...' ')'
1577///
1578///       type-id-list:
1579///         type-id
1580///         type-id-list ',' type-id
1581///
1582bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1583                                         llvm::SmallVector<TypeTy*, 2>
1584                                             &Exceptions,
1585                                         llvm::SmallVector<SourceRange, 2>
1586                                             &Ranges,
1587                                         bool &hasAnyExceptionSpec) {
1588  assert(Tok.is(tok::kw_throw) && "expected throw");
1589
1590  SourceLocation ThrowLoc = ConsumeToken();
1591
1592  if (!Tok.is(tok::l_paren)) {
1593    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1594  }
1595  SourceLocation LParenLoc = ConsumeParen();
1596
1597  // Parse throw(...), a Microsoft extension that means "this function
1598  // can throw anything".
1599  if (Tok.is(tok::ellipsis)) {
1600    hasAnyExceptionSpec = true;
1601    SourceLocation EllipsisLoc = ConsumeToken();
1602    if (!getLang().Microsoft)
1603      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1604    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1605    return false;
1606  }
1607
1608  // Parse the sequence of type-ids.
1609  SourceRange Range;
1610  while (Tok.isNot(tok::r_paren)) {
1611    TypeResult Res(ParseTypeName(&Range));
1612    if (!Res.isInvalid()) {
1613      Exceptions.push_back(Res.get());
1614      Ranges.push_back(Range);
1615    }
1616    if (Tok.is(tok::comma))
1617      ConsumeToken();
1618    else
1619      break;
1620  }
1621
1622  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1623  return false;
1624}
1625
1626/// \brief We have just started parsing the definition of a new class,
1627/// so push that class onto our stack of classes that is currently
1628/// being parsed.
1629void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool TopLevelClass) {
1630  assert((TopLevelClass || !ClassStack.empty()) &&
1631         "Nested class without outer class");
1632  ClassStack.push(new ParsingClass(ClassDecl, TopLevelClass));
1633}
1634
1635/// \brief Deallocate the given parsed class and all of its nested
1636/// classes.
1637void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1638  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1639    DeallocateParsedClasses(Class->NestedClasses[I]);
1640  delete Class;
1641}
1642
1643/// \brief Pop the top class of the stack of classes that are
1644/// currently being parsed.
1645///
1646/// This routine should be called when we have finished parsing the
1647/// definition of a class, but have not yet popped the Scope
1648/// associated with the class's definition.
1649///
1650/// \returns true if the class we've popped is a top-level class,
1651/// false otherwise.
1652void Parser::PopParsingClass() {
1653  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1654
1655  ParsingClass *Victim = ClassStack.top();
1656  ClassStack.pop();
1657  if (Victim->TopLevelClass) {
1658    // Deallocate all of the nested classes of this class,
1659    // recursively: we don't need to keep any of this information.
1660    DeallocateParsedClasses(Victim);
1661    return;
1662  }
1663  assert(!ClassStack.empty() && "Missing top-level class?");
1664
1665  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1666      Victim->NestedClasses.empty()) {
1667    // The victim is a nested class, but we will not need to perform
1668    // any processing after the definition of this class since it has
1669    // no members whose handling was delayed. Therefore, we can just
1670    // remove this nested class.
1671    delete Victim;
1672    return;
1673  }
1674
1675  // This nested class has some members that will need to be processed
1676  // after the top-level class is completely defined. Therefore, add
1677  // it to the list of nested classes within its parent.
1678  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1679  ClassStack.top()->NestedClasses.push_back(Victim);
1680  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1681}
1682
1683/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1684/// parses standard attributes.
1685///
1686/// [C++0x] attribute-specifier:
1687///         '[' '[' attribute-list ']' ']'
1688///
1689/// [C++0x] attribute-list:
1690///         attribute[opt]
1691///         attribute-list ',' attribute[opt]
1692///
1693/// [C++0x] attribute:
1694///         attribute-token attribute-argument-clause[opt]
1695///
1696/// [C++0x] attribute-token:
1697///         identifier
1698///         attribute-scoped-token
1699///
1700/// [C++0x] attribute-scoped-token:
1701///         attribute-namespace '::' identifier
1702///
1703/// [C++0x] attribute-namespace:
1704///         identifier
1705///
1706/// [C++0x] attribute-argument-clause:
1707///         '(' balanced-token-seq ')'
1708///
1709/// [C++0x] balanced-token-seq:
1710///         balanced-token
1711///         balanced-token-seq balanced-token
1712///
1713/// [C++0x] balanced-token:
1714///         '(' balanced-token-seq ')'
1715///         '[' balanced-token-seq ']'
1716///         '{' balanced-token-seq '}'
1717///         any token but '(', ')', '[', ']', '{', or '}'
1718CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1719  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1720      && "Not a C++0x attribute list");
1721
1722  SourceLocation StartLoc = Tok.getLocation(), Loc;
1723  AttributeList *CurrAttr = 0;
1724
1725  ConsumeBracket();
1726  ConsumeBracket();
1727
1728  if (Tok.is(tok::comma)) {
1729    Diag(Tok.getLocation(), diag::err_expected_ident);
1730    ConsumeToken();
1731  }
1732
1733  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1734    // attribute not present
1735    if (Tok.is(tok::comma)) {
1736      ConsumeToken();
1737      continue;
1738    }
1739
1740    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1741    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1742
1743    // scoped attribute
1744    if (Tok.is(tok::coloncolon)) {
1745      ConsumeToken();
1746
1747      if (!Tok.is(tok::identifier)) {
1748        Diag(Tok.getLocation(), diag::err_expected_ident);
1749        SkipUntil(tok::r_square, tok::comma, true, true);
1750        continue;
1751      }
1752
1753      ScopeName = AttrName;
1754      ScopeLoc = AttrLoc;
1755
1756      AttrName = Tok.getIdentifierInfo();
1757      AttrLoc = ConsumeToken();
1758    }
1759
1760    bool AttrParsed = false;
1761    // No scoped names are supported; ideally we could put all non-standard
1762    // attributes into namespaces.
1763    if (!ScopeName) {
1764      switch(AttributeList::getKind(AttrName))
1765      {
1766      // No arguments
1767      case AttributeList::AT_base_check:
1768      case AttributeList::AT_carries_dependency:
1769      case AttributeList::AT_final:
1770      case AttributeList::AT_hiding:
1771      case AttributeList::AT_noreturn:
1772      case AttributeList::AT_override: {
1773        if (Tok.is(tok::l_paren)) {
1774          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
1775            << AttrName->getName();
1776          break;
1777        }
1778
1779        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
1780                                     SourceLocation(), 0, 0, CurrAttr, false,
1781                                     true);
1782        AttrParsed = true;
1783        break;
1784      }
1785
1786      // One argument; must be a type-id or assignment-expression
1787      case AttributeList::AT_aligned: {
1788        if (Tok.isNot(tok::l_paren)) {
1789          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
1790            << AttrName->getName();
1791          break;
1792        }
1793        SourceLocation ParamLoc = ConsumeParen();
1794
1795        OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
1796
1797        MatchRHSPunctuation(tok::r_paren, ParamLoc);
1798
1799        ExprVector ArgExprs(Actions);
1800        ArgExprs.push_back(ArgExpr.release());
1801        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
1802                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
1803                                     false, true);
1804
1805        AttrParsed = true;
1806        break;
1807      }
1808
1809      // Silence warnings
1810      default: break;
1811      }
1812    }
1813
1814    // Skip the entire parameter clause, if any
1815    if (!AttrParsed && Tok.is(tok::l_paren)) {
1816      ConsumeParen();
1817      // SkipUntil maintains the balancedness of tokens.
1818      SkipUntil(tok::r_paren, false);
1819    }
1820  }
1821
1822  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1823    SkipUntil(tok::r_square, false);
1824  Loc = Tok.getLocation();
1825  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1826    SkipUntil(tok::r_square, false);
1827
1828  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
1829  return Attr;
1830}
1831
1832/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
1833/// attribute.
1834///
1835/// FIXME: Simply returns an alignof() expression if the argument is a
1836/// type. Ideally, the type should be propagated directly into Sema.
1837///
1838/// [C++0x] 'align' '(' type-id ')'
1839/// [C++0x] 'align' '(' assignment-expression ')'
1840Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
1841  if (isTypeIdInParens()) {
1842    EnterExpressionEvaluationContext Unevaluated(Actions,
1843                                                  Action::Unevaluated);
1844    SourceLocation TypeLoc = Tok.getLocation();
1845    TypeTy *Ty = ParseTypeName().get();
1846    SourceRange TypeRange(Start, Tok.getLocation());
1847    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty,
1848                                              TypeRange);
1849  } else
1850    return ParseConstantExpression();
1851}
1852