ParseDeclCXX.cpp revision f13ca06e57ac094ed05ea08c26a499af1ba0ce88 
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    ConsumeCodeCompletionToken();
54  }
55
56  SourceLocation IdentLoc;
57  IdentifierInfo *Ident = 0;
58
59  Token attrTok;
60
61  if (Tok.is(tok::identifier)) {
62    Ident = Tok.getIdentifierInfo();
63    IdentLoc = ConsumeToken();  // eat the identifier.
64  }
65
66  // Read label attributes, if present.
67  llvm::OwningPtr<AttributeList> AttrList;
68  if (Tok.is(tok::kw___attribute)) {
69    attrTok = Tok;
70
71    // FIXME: save these somewhere.
72    AttrList.reset(ParseGNUAttributes());
73  }
74
75  if (Tok.is(tok::equal)) {
76    if (AttrList)
77      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
78
79    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
80  }
81
82  if (Tok.isNot(tok::l_brace)) {
83    Diag(Tok, Ident ? diag::err_expected_lbrace :
84         diag::err_expected_ident_lbrace);
85    return DeclPtrTy();
86  }
87
88  SourceLocation LBrace = ConsumeBrace();
89
90  if (CurScope->isClassScope() || CurScope->isTemplateParamScope() ||
91      CurScope->isInObjcMethodScope() || CurScope->getBlockParent() ||
92      CurScope->getFnParent()) {
93    Diag(LBrace, diag::err_namespace_nonnamespace_scope);
94    SkipUntil(tok::r_brace, false);
95    return DeclPtrTy();
96  }
97
98  // Enter a scope for the namespace.
99  ParseScope NamespaceScope(this, Scope::DeclScope);
100
101  DeclPtrTy NamespcDecl =
102    Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace,
103                                   AttrList.get());
104
105  PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
106                                        PP.getSourceManager(),
107                                        "parsing namespace");
108
109  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
110    CXX0XAttributeList Attr;
111    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
112      Attr = ParseCXX0XAttributes();
113    ParseExternalDeclaration(Attr);
114  }
115
116  // Leave the namespace scope.
117  NamespaceScope.Exit();
118
119  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
120  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
121
122  DeclEnd = RBraceLoc;
123  return NamespcDecl;
124}
125
126/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
127/// alias definition.
128///
129Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
130                                              SourceLocation AliasLoc,
131                                              IdentifierInfo *Alias,
132                                              SourceLocation &DeclEnd) {
133  assert(Tok.is(tok::equal) && "Not equal token");
134
135  ConsumeToken(); // eat the '='.
136
137  if (Tok.is(tok::code_completion)) {
138    Actions.CodeCompleteNamespaceAliasDecl(CurScope);
139    ConsumeCodeCompletionToken();
140  }
141
142  CXXScopeSpec SS;
143  // Parse (optional) nested-name-specifier.
144  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
145
146  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
147    Diag(Tok, diag::err_expected_namespace_name);
148    // Skip to end of the definition and eat the ';'.
149    SkipUntil(tok::semi);
150    return DeclPtrTy();
151  }
152
153  // Parse identifier.
154  IdentifierInfo *Ident = Tok.getIdentifierInfo();
155  SourceLocation IdentLoc = ConsumeToken();
156
157  // Eat the ';'.
158  DeclEnd = Tok.getLocation();
159  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
160                   "", tok::semi);
161
162  return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias,
163                                        SS, IdentLoc, Ident);
164}
165
166/// ParseLinkage - We know that the current token is a string_literal
167/// and just before that, that extern was seen.
168///
169///       linkage-specification: [C++ 7.5p2: dcl.link]
170///         'extern' string-literal '{' declaration-seq[opt] '}'
171///         'extern' string-literal declaration
172///
173Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS,
174                                       unsigned Context) {
175  assert(Tok.is(tok::string_literal) && "Not a string literal!");
176  llvm::SmallString<8> LangBuffer;
177  // LangBuffer is guaranteed to be big enough.
178  bool Invalid = false;
179  llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
180  if (Invalid)
181    return DeclPtrTy();
182
183  SourceLocation Loc = ConsumeStringToken();
184
185  ParseScope LinkageScope(this, Scope::DeclScope);
186  DeclPtrTy LinkageSpec
187    = Actions.ActOnStartLinkageSpecification(CurScope,
188                                             /*FIXME: */SourceLocation(),
189                                             Loc, Lang,
190                                       Tok.is(tok::l_brace)? Tok.getLocation()
191                                                           : SourceLocation());
192
193  CXX0XAttributeList Attr;
194  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
195    Attr = ParseCXX0XAttributes();
196  }
197
198  if (Tok.isNot(tok::l_brace)) {
199    ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList);
200    return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
201                                                   SourceLocation());
202  }
203
204  DS.abort();
205
206  if (Attr.HasAttr)
207    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
208      << Attr.Range;
209
210  SourceLocation LBrace = ConsumeBrace();
211  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
212    CXX0XAttributeList Attr;
213    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
214      Attr = ParseCXX0XAttributes();
215    ParseExternalDeclaration(Attr);
216  }
217
218  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
219  return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
220}
221
222/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
223/// using-directive. Assumes that current token is 'using'.
224Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
225                                                     SourceLocation &DeclEnd,
226                                                     CXX0XAttributeList Attr) {
227  assert(Tok.is(tok::kw_using) && "Not using token");
228
229  // Eat 'using'.
230  SourceLocation UsingLoc = ConsumeToken();
231
232  if (Tok.is(tok::code_completion)) {
233    Actions.CodeCompleteUsing(CurScope);
234    ConsumeCodeCompletionToken();
235  }
236
237  if (Tok.is(tok::kw_namespace))
238    // Next token after 'using' is 'namespace' so it must be using-directive
239    return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
240
241  if (Attr.HasAttr)
242    Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
243      << Attr.Range;
244
245  // Otherwise, it must be using-declaration.
246  // Ignore illegal attributes (the caller should already have issued an error.
247  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
248}
249
250/// ParseUsingDirective - Parse C++ using-directive, assumes
251/// that current token is 'namespace' and 'using' was already parsed.
252///
253///       using-directive: [C++ 7.3.p4: namespace.udir]
254///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
255///                 namespace-name ;
256/// [GNU] using-directive:
257///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
258///                 namespace-name attributes[opt] ;
259///
260Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
261                                              SourceLocation UsingLoc,
262                                              SourceLocation &DeclEnd,
263                                              AttributeList *Attr) {
264  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
265
266  // Eat 'namespace'.
267  SourceLocation NamespcLoc = ConsumeToken();
268
269  if (Tok.is(tok::code_completion)) {
270    Actions.CodeCompleteUsingDirective(CurScope);
271    ConsumeCodeCompletionToken();
272  }
273
274  CXXScopeSpec SS;
275  // Parse (optional) nested-name-specifier.
276  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
277
278  IdentifierInfo *NamespcName = 0;
279  SourceLocation IdentLoc = SourceLocation();
280
281  // Parse namespace-name.
282  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
283    Diag(Tok, diag::err_expected_namespace_name);
284    // If there was invalid namespace name, skip to end of decl, and eat ';'.
285    SkipUntil(tok::semi);
286    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
287    return DeclPtrTy();
288  }
289
290  // Parse identifier.
291  NamespcName = Tok.getIdentifierInfo();
292  IdentLoc = ConsumeToken();
293
294  // Parse (optional) attributes (most likely GNU strong-using extension).
295  bool GNUAttr = false;
296  if (Tok.is(tok::kw___attribute)) {
297    GNUAttr = true;
298    Attr = addAttributeLists(Attr, ParseGNUAttributes());
299  }
300
301  // Eat ';'.
302  DeclEnd = Tok.getLocation();
303  ExpectAndConsume(tok::semi,
304                   GNUAttr ? diag::err_expected_semi_after_attribute_list :
305                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
306
307  return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
308                                      IdentLoc, NamespcName, Attr);
309}
310
311/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
312/// 'using' was already seen.
313///
314///     using-declaration: [C++ 7.3.p3: namespace.udecl]
315///       'using' 'typename'[opt] ::[opt] nested-name-specifier
316///               unqualified-id
317///       'using' :: unqualified-id
318///
319Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
320                                                SourceLocation UsingLoc,
321                                                SourceLocation &DeclEnd,
322                                                AccessSpecifier AS) {
323  CXXScopeSpec SS;
324  SourceLocation TypenameLoc;
325  bool IsTypeName;
326
327  // Ignore optional 'typename'.
328  // FIXME: This is wrong; we should parse this as a typename-specifier.
329  if (Tok.is(tok::kw_typename)) {
330    TypenameLoc = Tok.getLocation();
331    ConsumeToken();
332    IsTypeName = true;
333  }
334  else
335    IsTypeName = false;
336
337  // Parse nested-name-specifier.
338  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
339
340  // Check nested-name specifier.
341  if (SS.isInvalid()) {
342    SkipUntil(tok::semi);
343    return DeclPtrTy();
344  }
345
346  // Parse the unqualified-id. We allow parsing of both constructor and
347  // destructor names and allow the action module to diagnose any semantic
348  // errors.
349  UnqualifiedId Name;
350  if (ParseUnqualifiedId(SS,
351                         /*EnteringContext=*/false,
352                         /*AllowDestructorName=*/true,
353                         /*AllowConstructorName=*/true,
354                         /*ObjectType=*/0,
355                         Name)) {
356    SkipUntil(tok::semi);
357    return DeclPtrTy();
358  }
359
360  // Parse (optional) attributes (most likely GNU strong-using extension).
361  llvm::OwningPtr<AttributeList> AttrList;
362  if (Tok.is(tok::kw___attribute))
363    AttrList.reset(ParseGNUAttributes());
364
365  // Eat ';'.
366  DeclEnd = Tok.getLocation();
367  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
368                   AttrList ? "attributes list" : "using declaration",
369                   tok::semi);
370
371  return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name,
372                                       AttrList.get(), IsTypeName, TypenameLoc);
373}
374
375/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
376///
377///      static_assert-declaration:
378///        static_assert ( constant-expression  ,  string-literal  ) ;
379///
380Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
381  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
382  SourceLocation StaticAssertLoc = ConsumeToken();
383
384  if (Tok.isNot(tok::l_paren)) {
385    Diag(Tok, diag::err_expected_lparen);
386    return DeclPtrTy();
387  }
388
389  SourceLocation LParenLoc = ConsumeParen();
390
391  OwningExprResult AssertExpr(ParseConstantExpression());
392  if (AssertExpr.isInvalid()) {
393    SkipUntil(tok::semi);
394    return DeclPtrTy();
395  }
396
397  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
398    return DeclPtrTy();
399
400  if (Tok.isNot(tok::string_literal)) {
401    Diag(Tok, diag::err_expected_string_literal);
402    SkipUntil(tok::semi);
403    return DeclPtrTy();
404  }
405
406  OwningExprResult AssertMessage(ParseStringLiteralExpression());
407  if (AssertMessage.isInvalid())
408    return DeclPtrTy();
409
410  MatchRHSPunctuation(tok::r_paren, LParenLoc);
411
412  DeclEnd = Tok.getLocation();
413  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
414
415  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
416                                              move(AssertMessage));
417}
418
419/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
420///
421/// 'decltype' ( expression )
422///
423void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
424  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
425
426  SourceLocation StartLoc = ConsumeToken();
427  SourceLocation LParenLoc = Tok.getLocation();
428
429  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
430                       "decltype")) {
431    SkipUntil(tok::r_paren);
432    return;
433  }
434
435  // Parse the expression
436
437  // C++0x [dcl.type.simple]p4:
438  //   The operand of the decltype specifier is an unevaluated operand.
439  EnterExpressionEvaluationContext Unevaluated(Actions,
440                                               Action::Unevaluated);
441  OwningExprResult Result = ParseExpression();
442  if (Result.isInvalid()) {
443    SkipUntil(tok::r_paren);
444    return;
445  }
446
447  // Match the ')'
448  SourceLocation RParenLoc;
449  if (Tok.is(tok::r_paren))
450    RParenLoc = ConsumeParen();
451  else
452    MatchRHSPunctuation(tok::r_paren, LParenLoc);
453
454  if (RParenLoc.isInvalid())
455    return;
456
457  const char *PrevSpec = 0;
458  unsigned DiagID;
459  // Check for duplicate type specifiers (e.g. "int decltype(a)").
460  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
461                         DiagID, Result.release()))
462    Diag(StartLoc, DiagID) << PrevSpec;
463}
464
465/// ParseClassName - Parse a C++ class-name, which names a class. Note
466/// that we only check that the result names a type; semantic analysis
467/// will need to verify that the type names a class. The result is
468/// either a type or NULL, depending on whether a type name was
469/// found.
470///
471///       class-name: [C++ 9.1]
472///         identifier
473///         simple-template-id
474///
475Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
476                                          CXXScopeSpec *SS) {
477  // Check whether we have a template-id that names a type.
478  if (Tok.is(tok::annot_template_id)) {
479    TemplateIdAnnotation *TemplateId
480      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
481    if (TemplateId->Kind == TNK_Type_template ||
482        TemplateId->Kind == TNK_Dependent_template_name) {
483      AnnotateTemplateIdTokenAsType(SS);
484
485      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
486      TypeTy *Type = Tok.getAnnotationValue();
487      EndLocation = Tok.getAnnotationEndLoc();
488      ConsumeToken();
489
490      if (Type)
491        return Type;
492      return true;
493    }
494
495    // Fall through to produce an error below.
496  }
497
498  if (Tok.isNot(tok::identifier)) {
499    Diag(Tok, diag::err_expected_class_name);
500    return true;
501  }
502
503  IdentifierInfo *Id = Tok.getIdentifierInfo();
504  SourceLocation IdLoc = ConsumeToken();
505
506  if (Tok.is(tok::less)) {
507    // It looks the user intended to write a template-id here, but the
508    // template-name was wrong. Try to fix that.
509    TemplateNameKind TNK = TNK_Type_template;
510    TemplateTy Template;
511    if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, CurScope,
512                                             SS, Template, TNK)) {
513      Diag(IdLoc, diag::err_unknown_template_name)
514        << Id;
515    }
516
517    if (!Template)
518      return true;
519
520    // Form the template name
521    UnqualifiedId TemplateName;
522    TemplateName.setIdentifier(Id, IdLoc);
523
524    // Parse the full template-id, then turn it into a type.
525    if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
526                                SourceLocation(), true))
527      return true;
528    if (TNK == TNK_Dependent_template_name)
529      AnnotateTemplateIdTokenAsType(SS);
530
531    // If we didn't end up with a typename token, there's nothing more we
532    // can do.
533    if (Tok.isNot(tok::annot_typename))
534      return true;
535
536    // Retrieve the type from the annotation token, consume that token, and
537    // return.
538    EndLocation = Tok.getAnnotationEndLoc();
539    TypeTy *Type = Tok.getAnnotationValue();
540    ConsumeToken();
541    return Type;
542  }
543
544  // We have an identifier; check whether it is actually a type.
545  TypeTy *Type = Actions.getTypeName(*Id, IdLoc, CurScope, SS, true);
546  if (!Type) {
547    Diag(IdLoc, diag::err_expected_class_name);
548    return true;
549  }
550
551  // Consume the identifier.
552  EndLocation = IdLoc;
553  return Type;
554}
555
556/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
557/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
558/// until we reach the start of a definition or see a token that
559/// cannot start a definition. If SuppressDeclarations is true, we do know.
560///
561///       class-specifier: [C++ class]
562///         class-head '{' member-specification[opt] '}'
563///         class-head '{' member-specification[opt] '}' attributes[opt]
564///       class-head:
565///         class-key identifier[opt] base-clause[opt]
566///         class-key nested-name-specifier identifier base-clause[opt]
567///         class-key nested-name-specifier[opt] simple-template-id
568///                          base-clause[opt]
569/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
570/// [GNU]   class-key attributes[opt] nested-name-specifier
571///                          identifier base-clause[opt]
572/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
573///                          simple-template-id base-clause[opt]
574///       class-key:
575///         'class'
576///         'struct'
577///         'union'
578///
579///       elaborated-type-specifier: [C++ dcl.type.elab]
580///         class-key ::[opt] nested-name-specifier[opt] identifier
581///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
582///                          simple-template-id
583///
584///  Note that the C++ class-specifier and elaborated-type-specifier,
585///  together, subsume the C99 struct-or-union-specifier:
586///
587///       struct-or-union-specifier: [C99 6.7.2.1]
588///         struct-or-union identifier[opt] '{' struct-contents '}'
589///         struct-or-union identifier
590/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
591///                                                         '}' attributes[opt]
592/// [GNU]   struct-or-union attributes[opt] identifier
593///       struct-or-union:
594///         'struct'
595///         'union'
596void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
597                                 SourceLocation StartLoc, DeclSpec &DS,
598                                 const ParsedTemplateInfo &TemplateInfo,
599                                 AccessSpecifier AS, bool SuppressDeclarations){
600  DeclSpec::TST TagType;
601  if (TagTokKind == tok::kw_struct)
602    TagType = DeclSpec::TST_struct;
603  else if (TagTokKind == tok::kw_class)
604    TagType = DeclSpec::TST_class;
605  else {
606    assert(TagTokKind == tok::kw_union && "Not a class specifier");
607    TagType = DeclSpec::TST_union;
608  }
609
610  if (Tok.is(tok::code_completion)) {
611    // Code completion for a struct, class, or union name.
612    Actions.CodeCompleteTag(CurScope, TagType);
613    ConsumeCodeCompletionToken();
614  }
615
616  AttributeList *AttrList = 0;
617  // If attributes exist after tag, parse them.
618  if (Tok.is(tok::kw___attribute))
619    AttrList = ParseGNUAttributes();
620
621  // If declspecs exist after tag, parse them.
622  if (Tok.is(tok::kw___declspec))
623    AttrList = ParseMicrosoftDeclSpec(AttrList);
624
625  // If C++0x attributes exist here, parse them.
626  // FIXME: Are we consistent with the ordering of parsing of different
627  // styles of attributes?
628  if (isCXX0XAttributeSpecifier())
629    AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
630
631  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
632    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
633    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
634    // token sequence "struct __is_pod", make __is_pod into a normal
635    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
636    // properly.
637    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
638    Tok.setKind(tok::identifier);
639  }
640
641  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
642    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
643    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
644    // token sequence "struct __is_empty", make __is_empty into a normal
645    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
646    // properly.
647    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
648    Tok.setKind(tok::identifier);
649  }
650
651  // Parse the (optional) nested-name-specifier.
652  CXXScopeSpec &SS = DS.getTypeSpecScope();
653  if (getLang().CPlusPlus) {
654    // "FOO : BAR" is not a potential typo for "FOO::BAR".
655    ColonProtectionRAIIObject X(*this);
656
657    ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true);
658    if (SS.isSet())
659      if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
660        Diag(Tok, diag::err_expected_ident);
661  }
662
663  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
664
665  // Parse the (optional) class name or simple-template-id.
666  IdentifierInfo *Name = 0;
667  SourceLocation NameLoc;
668  TemplateIdAnnotation *TemplateId = 0;
669  if (Tok.is(tok::identifier)) {
670    Name = Tok.getIdentifierInfo();
671    NameLoc = ConsumeToken();
672
673    if (Tok.is(tok::less) && getLang().CPlusPlus) {
674      // The name was supposed to refer to a template, but didn't.
675      // Eat the template argument list and try to continue parsing this as
676      // a class (or template thereof).
677      TemplateArgList TemplateArgs;
678      SourceLocation LAngleLoc, RAngleLoc;
679      if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
680                                           true, LAngleLoc,
681                                           TemplateArgs, RAngleLoc)) {
682        // We couldn't parse the template argument list at all, so don't
683        // try to give any location information for the list.
684        LAngleLoc = RAngleLoc = SourceLocation();
685      }
686
687      Diag(NameLoc, diag::err_explicit_spec_non_template)
688        << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
689        << (TagType == DeclSpec::TST_class? 0
690            : TagType == DeclSpec::TST_struct? 1
691            : 2)
692        << Name
693        << SourceRange(LAngleLoc, RAngleLoc);
694
695      // Strip off the last template parameter list if it was empty, since
696      // we've removed its template argument list.
697      if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
698        if (TemplateParams && TemplateParams->size() > 1) {
699          TemplateParams->pop_back();
700        } else {
701          TemplateParams = 0;
702          const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
703            = ParsedTemplateInfo::NonTemplate;
704        }
705      } else if (TemplateInfo.Kind
706                                == ParsedTemplateInfo::ExplicitInstantiation) {
707        // Pretend this is just a forward declaration.
708        TemplateParams = 0;
709        const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
710          = ParsedTemplateInfo::NonTemplate;
711        const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
712          = SourceLocation();
713        const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
714          = SourceLocation();
715      }
716    }
717  } else if (Tok.is(tok::annot_template_id)) {
718    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
719    NameLoc = ConsumeToken();
720
721    if (TemplateId->Kind != TNK_Type_template) {
722      // The template-name in the simple-template-id refers to
723      // something other than a class template. Give an appropriate
724      // error message and skip to the ';'.
725      SourceRange Range(NameLoc);
726      if (SS.isNotEmpty())
727        Range.setBegin(SS.getBeginLoc());
728
729      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
730        << Name << static_cast<int>(TemplateId->Kind) << Range;
731
732      DS.SetTypeSpecError();
733      SkipUntil(tok::semi, false, true);
734      TemplateId->Destroy();
735      return;
736    }
737  }
738
739  // There are four options here.  If we have 'struct foo;', then this
740  // is either a forward declaration or a friend declaration, which
741  // have to be treated differently.  If we have 'struct foo {...' or
742  // 'struct foo :...' then this is a definition. Otherwise we have
743  // something like 'struct foo xyz', a reference.
744  // However, in some contexts, things look like declarations but are just
745  // references, e.g.
746  // new struct s;
747  // or
748  // &T::operator struct s;
749  // For these, SuppressDeclarations is true.
750  Action::TagUseKind TUK;
751  if (SuppressDeclarations)
752    TUK = Action::TUK_Reference;
753  else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
754    if (DS.isFriendSpecified()) {
755      // C++ [class.friend]p2:
756      //   A class shall not be defined in a friend declaration.
757      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
758        << SourceRange(DS.getFriendSpecLoc());
759
760      // Skip everything up to the semicolon, so that this looks like a proper
761      // friend class (or template thereof) declaration.
762      SkipUntil(tok::semi, true, true);
763      TUK = Action::TUK_Friend;
764    } else {
765      // Okay, this is a class definition.
766      TUK = Action::TUK_Definition;
767    }
768  } else if (Tok.is(tok::semi))
769    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
770  else
771    TUK = Action::TUK_Reference;
772
773  if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
774    // We have a declaration or reference to an anonymous class.
775    Diag(StartLoc, diag::err_anon_type_definition)
776      << DeclSpec::getSpecifierName(TagType);
777
778    SkipUntil(tok::comma, true);
779
780    if (TemplateId)
781      TemplateId->Destroy();
782    return;
783  }
784
785  // Create the tag portion of the class or class template.
786  Action::DeclResult TagOrTempResult = true; // invalid
787  Action::TypeResult TypeResult = true; // invalid
788
789  bool Owned = false;
790  if (TemplateId) {
791    // Explicit specialization, class template partial specialization,
792    // or explicit instantiation.
793    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
794                                       TemplateId->getTemplateArgs(),
795                                       TemplateId->NumArgs);
796    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
797        TUK == Action::TUK_Declaration) {
798      // This is an explicit instantiation of a class template.
799      TagOrTempResult
800        = Actions.ActOnExplicitInstantiation(CurScope,
801                                             TemplateInfo.ExternLoc,
802                                             TemplateInfo.TemplateLoc,
803                                             TagType,
804                                             StartLoc,
805                                             SS,
806                                     TemplateTy::make(TemplateId->Template),
807                                             TemplateId->TemplateNameLoc,
808                                             TemplateId->LAngleLoc,
809                                             TemplateArgsPtr,
810                                             TemplateId->RAngleLoc,
811                                             AttrList);
812
813    // Friend template-ids are treated as references unless
814    // they have template headers, in which case they're ill-formed
815    // (FIXME: "template <class T> friend class A<T>::B<int>;").
816    // We diagnose this error in ActOnClassTemplateSpecialization.
817    } else if (TUK == Action::TUK_Reference ||
818               (TUK == Action::TUK_Friend &&
819                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
820      TypeResult
821        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
822                                      TemplateId->TemplateNameLoc,
823                                      TemplateId->LAngleLoc,
824                                      TemplateArgsPtr,
825                                      TemplateId->RAngleLoc);
826
827      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
828                                                  TagType, StartLoc);
829    } else {
830      // This is an explicit specialization or a class template
831      // partial specialization.
832      TemplateParameterLists FakedParamLists;
833
834      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
835        // This looks like an explicit instantiation, because we have
836        // something like
837        //
838        //   template class Foo<X>
839        //
840        // but it actually has a definition. Most likely, this was
841        // meant to be an explicit specialization, but the user forgot
842        // the '<>' after 'template'.
843        assert(TUK == Action::TUK_Definition && "Expected a definition here");
844
845        SourceLocation LAngleLoc
846          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
847        Diag(TemplateId->TemplateNameLoc,
848             diag::err_explicit_instantiation_with_definition)
849          << SourceRange(TemplateInfo.TemplateLoc)
850          << FixItHint::CreateInsertion(LAngleLoc, "<>");
851
852        // Create a fake template parameter list that contains only
853        // "template<>", so that we treat this construct as a class
854        // template specialization.
855        FakedParamLists.push_back(
856          Actions.ActOnTemplateParameterList(0, SourceLocation(),
857                                             TemplateInfo.TemplateLoc,
858                                             LAngleLoc,
859                                             0, 0,
860                                             LAngleLoc));
861        TemplateParams = &FakedParamLists;
862      }
863
864      // Build the class template specialization.
865      TagOrTempResult
866        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
867                       StartLoc, SS,
868                       TemplateTy::make(TemplateId->Template),
869                       TemplateId->TemplateNameLoc,
870                       TemplateId->LAngleLoc,
871                       TemplateArgsPtr,
872                       TemplateId->RAngleLoc,
873                       AttrList,
874                       Action::MultiTemplateParamsArg(Actions,
875                                    TemplateParams? &(*TemplateParams)[0] : 0,
876                                 TemplateParams? TemplateParams->size() : 0));
877    }
878    TemplateId->Destroy();
879  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
880             TUK == Action::TUK_Declaration) {
881    // Explicit instantiation of a member of a class template
882    // specialization, e.g.,
883    //
884    //   template struct Outer<int>::Inner;
885    //
886    TagOrTempResult
887      = Actions.ActOnExplicitInstantiation(CurScope,
888                                           TemplateInfo.ExternLoc,
889                                           TemplateInfo.TemplateLoc,
890                                           TagType, StartLoc, SS, Name,
891                                           NameLoc, AttrList);
892  } else {
893    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
894        TUK == Action::TUK_Definition) {
895      // FIXME: Diagnose this particular error.
896    }
897
898    bool IsDependent = false;
899
900    // Declaration or definition of a class type
901    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
902                                       Name, NameLoc, AttrList, AS,
903                                  Action::MultiTemplateParamsArg(Actions,
904                                    TemplateParams? &(*TemplateParams)[0] : 0,
905                                    TemplateParams? TemplateParams->size() : 0),
906                                       Owned, IsDependent);
907
908    // If ActOnTag said the type was dependent, try again with the
909    // less common call.
910    if (IsDependent)
911      TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
912                                             SS, Name, StartLoc, NameLoc);
913  }
914
915  // If there is a body, parse it and inform the actions module.
916  if (TUK == Action::TUK_Definition) {
917    assert(Tok.is(tok::l_brace) ||
918           (getLang().CPlusPlus && Tok.is(tok::colon)));
919    if (getLang().CPlusPlus)
920      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
921    else
922      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
923  }
924
925  void *Result;
926  if (!TypeResult.isInvalid()) {
927    TagType = DeclSpec::TST_typename;
928    Result = TypeResult.get();
929    Owned = false;
930  } else if (!TagOrTempResult.isInvalid()) {
931    Result = TagOrTempResult.get().getAs<void>();
932  } else {
933    DS.SetTypeSpecError();
934    return;
935  }
936
937  const char *PrevSpec = 0;
938  unsigned DiagID;
939
940  // FIXME: The DeclSpec should keep the locations of both the keyword and the
941  // name (if there is one).
942  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
943
944  if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
945                         Result, Owned))
946    Diag(StartLoc, DiagID) << PrevSpec;
947
948  // At this point, we've successfully parsed a class-specifier in 'definition'
949  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
950  // going to look at what comes after it to improve error recovery.  If an
951  // impossible token occurs next, we assume that the programmer forgot a ; at
952  // the end of the declaration and recover that way.
953  //
954  // This switch enumerates the valid "follow" set for definition.
955  if (TUK == Action::TUK_Definition) {
956    bool ExpectedSemi = true;
957    switch (Tok.getKind()) {
958    default: break;
959    case tok::semi:               // struct foo {...} ;
960    case tok::star:               // struct foo {...} *         P;
961    case tok::amp:                // struct foo {...} &         R = ...
962    case tok::identifier:         // struct foo {...} V         ;
963    case tok::r_paren:            //(struct foo {...} )         {4}
964    case tok::annot_cxxscope:     // struct foo {...} a::       b;
965    case tok::annot_typename:     // struct foo {...} a         ::b;
966    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
967    case tok::l_paren:            // struct foo {...} (         x);
968    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
969      ExpectedSemi = false;
970      break;
971    // Type qualifiers
972    case tok::kw_const:           // struct foo {...} const     x;
973    case tok::kw_volatile:        // struct foo {...} volatile  x;
974    case tok::kw_restrict:        // struct foo {...} restrict  x;
975    case tok::kw_inline:          // struct foo {...} inline    foo() {};
976    // Storage-class specifiers
977    case tok::kw_static:          // struct foo {...} static    x;
978    case tok::kw_extern:          // struct foo {...} extern    x;
979    case tok::kw_typedef:         // struct foo {...} typedef   x;
980    case tok::kw_register:        // struct foo {...} register  x;
981    case tok::kw_auto:            // struct foo {...} auto      x;
982    case tok::kw_mutable:         // struct foo {...} mutable      x;
983      // As shown above, type qualifiers and storage class specifiers absolutely
984      // can occur after class specifiers according to the grammar.  However,
985      // almost noone actually writes code like this.  If we see one of these,
986      // it is much more likely that someone missed a semi colon and the
987      // type/storage class specifier we're seeing is part of the *next*
988      // intended declaration, as in:
989      //
990      //   struct foo { ... }
991      //   typedef int X;
992      //
993      // We'd really like to emit a missing semicolon error instead of emitting
994      // an error on the 'int' saying that you can't have two type specifiers in
995      // the same declaration of X.  Because of this, we look ahead past this
996      // token to see if it's a type specifier.  If so, we know the code is
997      // otherwise invalid, so we can produce the expected semi error.
998      if (!isKnownToBeTypeSpecifier(NextToken()))
999        ExpectedSemi = false;
1000      break;
1001
1002    case tok::r_brace:  // struct bar { struct foo {...} }
1003      // Missing ';' at end of struct is accepted as an extension in C mode.
1004      if (!getLang().CPlusPlus)
1005        ExpectedSemi = false;
1006      break;
1007    }
1008
1009    if (ExpectedSemi) {
1010      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1011                       TagType == DeclSpec::TST_class ? "class"
1012                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1013      // Push this token back into the preprocessor and change our current token
1014      // to ';' so that the rest of the code recovers as though there were an
1015      // ';' after the definition.
1016      PP.EnterToken(Tok);
1017      Tok.setKind(tok::semi);
1018    }
1019  }
1020}
1021
1022/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1023///
1024///       base-clause : [C++ class.derived]
1025///         ':' base-specifier-list
1026///       base-specifier-list:
1027///         base-specifier '...'[opt]
1028///         base-specifier-list ',' base-specifier '...'[opt]
1029void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
1030  assert(Tok.is(tok::colon) && "Not a base clause");
1031  ConsumeToken();
1032
1033  // Build up an array of parsed base specifiers.
1034  llvm::SmallVector<BaseTy *, 8> BaseInfo;
1035
1036  while (true) {
1037    // Parse a base-specifier.
1038    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1039    if (Result.isInvalid()) {
1040      // Skip the rest of this base specifier, up until the comma or
1041      // opening brace.
1042      SkipUntil(tok::comma, tok::l_brace, true, true);
1043    } else {
1044      // Add this to our array of base specifiers.
1045      BaseInfo.push_back(Result.get());
1046    }
1047
1048    // If the next token is a comma, consume it and keep reading
1049    // base-specifiers.
1050    if (Tok.isNot(tok::comma)) break;
1051
1052    // Consume the comma.
1053    ConsumeToken();
1054  }
1055
1056  // Attach the base specifiers
1057  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1058}
1059
1060/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1061/// one entry in the base class list of a class specifier, for example:
1062///    class foo : public bar, virtual private baz {
1063/// 'public bar' and 'virtual private baz' are each base-specifiers.
1064///
1065///       base-specifier: [C++ class.derived]
1066///         ::[opt] nested-name-specifier[opt] class-name
1067///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1068///                        class-name
1069///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1070///                        class-name
1071Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
1072  bool IsVirtual = false;
1073  SourceLocation StartLoc = Tok.getLocation();
1074
1075  // Parse the 'virtual' keyword.
1076  if (Tok.is(tok::kw_virtual))  {
1077    ConsumeToken();
1078    IsVirtual = true;
1079  }
1080
1081  // Parse an (optional) access specifier.
1082  AccessSpecifier Access = getAccessSpecifierIfPresent();
1083  if (Access != AS_none)
1084    ConsumeToken();
1085
1086  // Parse the 'virtual' keyword (again!), in case it came after the
1087  // access specifier.
1088  if (Tok.is(tok::kw_virtual))  {
1089    SourceLocation VirtualLoc = ConsumeToken();
1090    if (IsVirtual) {
1091      // Complain about duplicate 'virtual'
1092      Diag(VirtualLoc, diag::err_dup_virtual)
1093        << FixItHint::CreateRemoval(VirtualLoc);
1094    }
1095
1096    IsVirtual = true;
1097  }
1098
1099  // Parse optional '::' and optional nested-name-specifier.
1100  CXXScopeSpec SS;
1101  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0,
1102                                 /*EnteringContext=*/false);
1103
1104  // The location of the base class itself.
1105  SourceLocation BaseLoc = Tok.getLocation();
1106
1107  // Parse the class-name.
1108  SourceLocation EndLocation;
1109  TypeResult BaseType = ParseClassName(EndLocation, &SS);
1110  if (BaseType.isInvalid())
1111    return true;
1112
1113  // Find the complete source range for the base-specifier.
1114  SourceRange Range(StartLoc, EndLocation);
1115
1116  // Notify semantic analysis that we have parsed a complete
1117  // base-specifier.
1118  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1119                                    BaseType.get(), BaseLoc);
1120}
1121
1122/// getAccessSpecifierIfPresent - Determine whether the next token is
1123/// a C++ access-specifier.
1124///
1125///       access-specifier: [C++ class.derived]
1126///         'private'
1127///         'protected'
1128///         'public'
1129AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1130  switch (Tok.getKind()) {
1131  default: return AS_none;
1132  case tok::kw_private: return AS_private;
1133  case tok::kw_protected: return AS_protected;
1134  case tok::kw_public: return AS_public;
1135  }
1136}
1137
1138void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1139                                             DeclPtrTy ThisDecl) {
1140  // We just declared a member function. If this member function
1141  // has any default arguments, we'll need to parse them later.
1142  LateParsedMethodDeclaration *LateMethod = 0;
1143  DeclaratorChunk::FunctionTypeInfo &FTI
1144    = DeclaratorInfo.getTypeObject(0).Fun;
1145  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1146    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1147      if (!LateMethod) {
1148        // Push this method onto the stack of late-parsed method
1149        // declarations.
1150        getCurrentClass().MethodDecls.push_back(
1151                                LateParsedMethodDeclaration(ThisDecl));
1152        LateMethod = &getCurrentClass().MethodDecls.back();
1153        LateMethod->TemplateScope = CurScope->isTemplateParamScope();
1154
1155        // Add all of the parameters prior to this one (they don't
1156        // have default arguments).
1157        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1158        for (unsigned I = 0; I < ParamIdx; ++I)
1159          LateMethod->DefaultArgs.push_back(
1160                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1161      }
1162
1163      // Add this parameter to the list of parameters (it or may
1164      // not have a default argument).
1165      LateMethod->DefaultArgs.push_back(
1166        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1167                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1168    }
1169  }
1170}
1171
1172/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1173///
1174///       member-declaration:
1175///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1176///         function-definition ';'[opt]
1177///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1178///         using-declaration                                            [TODO]
1179/// [C++0x] static_assert-declaration
1180///         template-declaration
1181/// [GNU]   '__extension__' member-declaration
1182///
1183///       member-declarator-list:
1184///         member-declarator
1185///         member-declarator-list ',' member-declarator
1186///
1187///       member-declarator:
1188///         declarator pure-specifier[opt]
1189///         declarator constant-initializer[opt]
1190///         identifier[opt] ':' constant-expression
1191///
1192///       pure-specifier:
1193///         '= 0'
1194///
1195///       constant-initializer:
1196///         '=' constant-expression
1197///
1198void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1199                                       const ParsedTemplateInfo &TemplateInfo) {
1200  // Access declarations.
1201  if (!TemplateInfo.Kind &&
1202      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1203      !TryAnnotateCXXScopeToken() &&
1204      Tok.is(tok::annot_cxxscope)) {
1205    bool isAccessDecl = false;
1206    if (NextToken().is(tok::identifier))
1207      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1208    else
1209      isAccessDecl = NextToken().is(tok::kw_operator);
1210
1211    if (isAccessDecl) {
1212      // Collect the scope specifier token we annotated earlier.
1213      CXXScopeSpec SS;
1214      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
1215
1216      // Try to parse an unqualified-id.
1217      UnqualifiedId Name;
1218      if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
1219        SkipUntil(tok::semi);
1220        return;
1221      }
1222
1223      // TODO: recover from mistakenly-qualified operator declarations.
1224      if (ExpectAndConsume(tok::semi,
1225                           diag::err_expected_semi_after,
1226                           "access declaration",
1227                           tok::semi))
1228        return;
1229
1230      Actions.ActOnUsingDeclaration(CurScope, AS,
1231                                    false, SourceLocation(),
1232                                    SS, Name,
1233                                    /* AttrList */ 0,
1234                                    /* IsTypeName */ false,
1235                                    SourceLocation());
1236      return;
1237    }
1238  }
1239
1240  // static_assert-declaration
1241  if (Tok.is(tok::kw_static_assert)) {
1242    // FIXME: Check for templates
1243    SourceLocation DeclEnd;
1244    ParseStaticAssertDeclaration(DeclEnd);
1245    return;
1246  }
1247
1248  if (Tok.is(tok::kw_template)) {
1249    assert(!TemplateInfo.TemplateParams &&
1250           "Nested template improperly parsed?");
1251    SourceLocation DeclEnd;
1252    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1253                                         AS);
1254    return;
1255  }
1256
1257  // Handle:  member-declaration ::= '__extension__' member-declaration
1258  if (Tok.is(tok::kw___extension__)) {
1259    // __extension__ silences extension warnings in the subexpression.
1260    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1261    ConsumeToken();
1262    return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
1263  }
1264
1265  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1266  // is a bitfield.
1267  ColonProtectionRAIIObject X(*this);
1268
1269  CXX0XAttributeList AttrList;
1270  // Optional C++0x attribute-specifier
1271  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1272    AttrList = ParseCXX0XAttributes();
1273
1274  if (Tok.is(tok::kw_using)) {
1275    // FIXME: Check for template aliases
1276
1277    if (AttrList.HasAttr)
1278      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1279        << AttrList.Range;
1280
1281    // Eat 'using'.
1282    SourceLocation UsingLoc = ConsumeToken();
1283
1284    if (Tok.is(tok::kw_namespace)) {
1285      Diag(UsingLoc, diag::err_using_namespace_in_class);
1286      SkipUntil(tok::semi, true, true);
1287    } else {
1288      SourceLocation DeclEnd;
1289      // Otherwise, it must be using-declaration.
1290      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1291    }
1292    return;
1293  }
1294
1295  SourceLocation DSStart = Tok.getLocation();
1296  // decl-specifier-seq:
1297  // Parse the common declaration-specifiers piece.
1298  ParsingDeclSpec DS(*this);
1299  DS.AddAttributes(AttrList.AttrList);
1300  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1301
1302  Action::MultiTemplateParamsArg TemplateParams(Actions,
1303      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1304      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1305
1306  if (Tok.is(tok::semi)) {
1307    ConsumeToken();
1308    Actions.ParsedFreeStandingDeclSpec(CurScope, AS, DS);
1309    return;
1310  }
1311
1312  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1313
1314  if (Tok.isNot(tok::colon)) {
1315    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1316    ColonProtectionRAIIObject X(*this);
1317
1318    // Parse the first declarator.
1319    ParseDeclarator(DeclaratorInfo);
1320    // Error parsing the declarator?
1321    if (!DeclaratorInfo.hasName()) {
1322      // If so, skip until the semi-colon or a }.
1323      SkipUntil(tok::r_brace, true);
1324      if (Tok.is(tok::semi))
1325        ConsumeToken();
1326      return;
1327    }
1328
1329    // If attributes exist after the declarator, but before an '{', parse them.
1330    if (Tok.is(tok::kw___attribute)) {
1331      SourceLocation Loc;
1332      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1333      DeclaratorInfo.AddAttributes(AttrList, Loc);
1334    }
1335
1336    // function-definition:
1337    if (Tok.is(tok::l_brace)
1338        || (DeclaratorInfo.isFunctionDeclarator() &&
1339            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1340      if (!DeclaratorInfo.isFunctionDeclarator()) {
1341        Diag(Tok, diag::err_func_def_no_params);
1342        ConsumeBrace();
1343        SkipUntil(tok::r_brace, true);
1344        return;
1345      }
1346
1347      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1348        Diag(Tok, diag::err_function_declared_typedef);
1349        // This recovery skips the entire function body. It would be nice
1350        // to simply call ParseCXXInlineMethodDef() below, however Sema
1351        // assumes the declarator represents a function, not a typedef.
1352        ConsumeBrace();
1353        SkipUntil(tok::r_brace, true);
1354        return;
1355      }
1356
1357      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1358      return;
1359    }
1360  }
1361
1362  // member-declarator-list:
1363  //   member-declarator
1364  //   member-declarator-list ',' member-declarator
1365
1366  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1367  OwningExprResult BitfieldSize(Actions);
1368  OwningExprResult Init(Actions);
1369  bool Deleted = false;
1370
1371  while (1) {
1372    // member-declarator:
1373    //   declarator pure-specifier[opt]
1374    //   declarator constant-initializer[opt]
1375    //   identifier[opt] ':' constant-expression
1376    if (Tok.is(tok::colon)) {
1377      ConsumeToken();
1378      BitfieldSize = ParseConstantExpression();
1379      if (BitfieldSize.isInvalid())
1380        SkipUntil(tok::comma, true, true);
1381    }
1382
1383    // pure-specifier:
1384    //   '= 0'
1385    //
1386    // constant-initializer:
1387    //   '=' constant-expression
1388    //
1389    // defaulted/deleted function-definition:
1390    //   '=' 'default'                          [TODO]
1391    //   '=' 'delete'
1392    if (Tok.is(tok::equal)) {
1393      ConsumeToken();
1394      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1395        ConsumeToken();
1396        Deleted = true;
1397      } else {
1398        Init = ParseInitializer();
1399        if (Init.isInvalid())
1400          SkipUntil(tok::comma, true, true);
1401      }
1402    }
1403
1404    // If a simple-asm-expr is present, parse it.
1405    if (Tok.is(tok::kw_asm)) {
1406      SourceLocation Loc;
1407      OwningExprResult AsmLabel(ParseSimpleAsm(&Loc));
1408      if (AsmLabel.isInvalid())
1409        SkipUntil(tok::comma, true, true);
1410
1411      DeclaratorInfo.setAsmLabel(AsmLabel.release());
1412      DeclaratorInfo.SetRangeEnd(Loc);
1413    }
1414
1415    // If attributes exist after the declarator, parse them.
1416    if (Tok.is(tok::kw___attribute)) {
1417      SourceLocation Loc;
1418      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1419      DeclaratorInfo.AddAttributes(AttrList, Loc);
1420    }
1421
1422    // NOTE: If Sema is the Action module and declarator is an instance field,
1423    // this call will *not* return the created decl; It will return null.
1424    // See Sema::ActOnCXXMemberDeclarator for details.
1425
1426    DeclPtrTy ThisDecl;
1427    if (DS.isFriendSpecified()) {
1428      // TODO: handle initializers, bitfields, 'delete'
1429      ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
1430                                                 /*IsDefinition*/ false,
1431                                                 move(TemplateParams));
1432    } else {
1433      ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1434                                                  DeclaratorInfo,
1435                                                  move(TemplateParams),
1436                                                  BitfieldSize.release(),
1437                                                  Init.release(),
1438                                                  /*IsDefinition*/Deleted,
1439                                                  Deleted);
1440    }
1441    if (ThisDecl)
1442      DeclsInGroup.push_back(ThisDecl);
1443
1444    if (DeclaratorInfo.isFunctionDeclarator() &&
1445        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1446          != DeclSpec::SCS_typedef) {
1447      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1448    }
1449
1450    DeclaratorInfo.complete(ThisDecl);
1451
1452    // If we don't have a comma, it is either the end of the list (a ';')
1453    // or an error, bail out.
1454    if (Tok.isNot(tok::comma))
1455      break;
1456
1457    // Consume the comma.
1458    ConsumeToken();
1459
1460    // Parse the next declarator.
1461    DeclaratorInfo.clear();
1462    BitfieldSize = 0;
1463    Init = 0;
1464    Deleted = false;
1465
1466    // Attributes are only allowed on the second declarator.
1467    if (Tok.is(tok::kw___attribute)) {
1468      SourceLocation Loc;
1469      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1470      DeclaratorInfo.AddAttributes(AttrList, Loc);
1471    }
1472
1473    if (Tok.isNot(tok::colon))
1474      ParseDeclarator(DeclaratorInfo);
1475  }
1476
1477  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1478    // Skip to end of block or statement.
1479    SkipUntil(tok::r_brace, true, true);
1480    // If we stopped at a ';', eat it.
1481    if (Tok.is(tok::semi)) ConsumeToken();
1482    return;
1483  }
1484
1485  Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1486                                  DeclsInGroup.size());
1487}
1488
1489/// ParseCXXMemberSpecification - Parse the class definition.
1490///
1491///       member-specification:
1492///         member-declaration member-specification[opt]
1493///         access-specifier ':' member-specification[opt]
1494///
1495void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1496                                         unsigned TagType, DeclPtrTy TagDecl) {
1497  assert((TagType == DeclSpec::TST_struct ||
1498         TagType == DeclSpec::TST_union  ||
1499         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1500
1501  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1502                                        PP.getSourceManager(),
1503                                        "parsing struct/union/class body");
1504
1505  // Determine whether this is a non-nested class. Note that local
1506  // classes are *not* considered to be nested classes.
1507  bool NonNestedClass = true;
1508  if (!ClassStack.empty()) {
1509    for (const Scope *S = CurScope; S; S = S->getParent()) {
1510      if (S->isClassScope()) {
1511        // We're inside a class scope, so this is a nested class.
1512        NonNestedClass = false;
1513        break;
1514      }
1515
1516      if ((S->getFlags() & Scope::FnScope)) {
1517        // If we're in a function or function template declared in the
1518        // body of a class, then this is a local class rather than a
1519        // nested class.
1520        const Scope *Parent = S->getParent();
1521        if (Parent->isTemplateParamScope())
1522          Parent = Parent->getParent();
1523        if (Parent->isClassScope())
1524          break;
1525      }
1526    }
1527  }
1528
1529  // Enter a scope for the class.
1530  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1531
1532  // Note that we are parsing a new (potentially-nested) class definition.
1533  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1534
1535  if (TagDecl)
1536    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1537
1538  if (Tok.is(tok::colon)) {
1539    ParseBaseClause(TagDecl);
1540
1541    if (!Tok.is(tok::l_brace)) {
1542      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1543
1544      if (TagDecl)
1545        Actions.ActOnTagDefinitionError(CurScope, TagDecl);
1546      return;
1547    }
1548  }
1549
1550  assert(Tok.is(tok::l_brace));
1551
1552  SourceLocation LBraceLoc = ConsumeBrace();
1553
1554  if (TagDecl)
1555    Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc);
1556
1557  // C++ 11p3: Members of a class defined with the keyword class are private
1558  // by default. Members of a class defined with the keywords struct or union
1559  // are public by default.
1560  AccessSpecifier CurAS;
1561  if (TagType == DeclSpec::TST_class)
1562    CurAS = AS_private;
1563  else
1564    CurAS = AS_public;
1565
1566  // While we still have something to read, read the member-declarations.
1567  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1568    // Each iteration of this loop reads one member-declaration.
1569
1570    // Check for extraneous top-level semicolon.
1571    if (Tok.is(tok::semi)) {
1572      Diag(Tok, diag::ext_extra_struct_semi)
1573        << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
1574        << FixItHint::CreateRemoval(Tok.getLocation());
1575      ConsumeToken();
1576      continue;
1577    }
1578
1579    AccessSpecifier AS = getAccessSpecifierIfPresent();
1580    if (AS != AS_none) {
1581      // Current token is a C++ access specifier.
1582      CurAS = AS;
1583      SourceLocation ASLoc = Tok.getLocation();
1584      ConsumeToken();
1585      if (Tok.is(tok::colon))
1586        Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
1587      else
1588        Diag(Tok, diag::err_expected_colon);
1589      ConsumeToken();
1590      continue;
1591    }
1592
1593    // FIXME: Make sure we don't have a template here.
1594
1595    // Parse all the comma separated declarators.
1596    ParseCXXClassMemberDeclaration(CurAS);
1597  }
1598
1599  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1600
1601  // If attributes exist after class contents, parse them.
1602  llvm::OwningPtr<AttributeList> AttrList;
1603  if (Tok.is(tok::kw___attribute))
1604    AttrList.reset(ParseGNUAttributes());
1605
1606  if (TagDecl)
1607    Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1608                                              LBraceLoc, RBraceLoc,
1609                                              AttrList.get());
1610
1611  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1612  // complete within function bodies, default arguments,
1613  // exception-specifications, and constructor ctor-initializers (including
1614  // such things in nested classes).
1615  //
1616  // FIXME: Only function bodies and constructor ctor-initializers are
1617  // parsed correctly, fix the rest.
1618  if (NonNestedClass) {
1619    // We are not inside a nested class. This class and its nested classes
1620    // are complete and we can parse the delayed portions of method
1621    // declarations and the lexed inline method definitions.
1622    ParseLexedMethodDeclarations(getCurrentClass());
1623    ParseLexedMethodDefs(getCurrentClass());
1624  }
1625
1626  if (TagDecl)
1627    Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1628
1629  // Leave the class scope.
1630  ParsingDef.Pop();
1631  ClassScope.Exit();
1632}
1633
1634/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1635/// which explicitly initializes the members or base classes of a
1636/// class (C++ [class.base.init]). For example, the three initializers
1637/// after the ':' in the Derived constructor below:
1638///
1639/// @code
1640/// class Base { };
1641/// class Derived : Base {
1642///   int x;
1643///   float f;
1644/// public:
1645///   Derived(float f) : Base(), x(17), f(f) { }
1646/// };
1647/// @endcode
1648///
1649/// [C++]  ctor-initializer:
1650///          ':' mem-initializer-list
1651///
1652/// [C++]  mem-initializer-list:
1653///          mem-initializer
1654///          mem-initializer , mem-initializer-list
1655void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1656  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1657
1658  SourceLocation ColonLoc = ConsumeToken();
1659
1660  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1661  bool AnyErrors = false;
1662
1663  do {
1664    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1665    if (!MemInit.isInvalid())
1666      MemInitializers.push_back(MemInit.get());
1667    else
1668      AnyErrors = true;
1669
1670    if (Tok.is(tok::comma))
1671      ConsumeToken();
1672    else if (Tok.is(tok::l_brace))
1673      break;
1674    else {
1675      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1676      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1677      SkipUntil(tok::l_brace, true, true);
1678      break;
1679    }
1680  } while (true);
1681
1682  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1683                               MemInitializers.data(), MemInitializers.size(),
1684                               AnyErrors);
1685}
1686
1687/// ParseMemInitializer - Parse a C++ member initializer, which is
1688/// part of a constructor initializer that explicitly initializes one
1689/// member or base class (C++ [class.base.init]). See
1690/// ParseConstructorInitializer for an example.
1691///
1692/// [C++] mem-initializer:
1693///         mem-initializer-id '(' expression-list[opt] ')'
1694///
1695/// [C++] mem-initializer-id:
1696///         '::'[opt] nested-name-specifier[opt] class-name
1697///         identifier
1698Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1699  // parse '::'[opt] nested-name-specifier[opt]
1700  CXXScopeSpec SS;
1701  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1702  TypeTy *TemplateTypeTy = 0;
1703  if (Tok.is(tok::annot_template_id)) {
1704    TemplateIdAnnotation *TemplateId
1705      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1706    if (TemplateId->Kind == TNK_Type_template ||
1707        TemplateId->Kind == TNK_Dependent_template_name) {
1708      AnnotateTemplateIdTokenAsType(&SS);
1709      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1710      TemplateTypeTy = Tok.getAnnotationValue();
1711    }
1712  }
1713  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1714    Diag(Tok, diag::err_expected_member_or_base_name);
1715    return true;
1716  }
1717
1718  // Get the identifier. This may be a member name or a class name,
1719  // but we'll let the semantic analysis determine which it is.
1720  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1721  SourceLocation IdLoc = ConsumeToken();
1722
1723  // Parse the '('.
1724  if (Tok.isNot(tok::l_paren)) {
1725    Diag(Tok, diag::err_expected_lparen);
1726    return true;
1727  }
1728  SourceLocation LParenLoc = ConsumeParen();
1729
1730  // Parse the optional expression-list.
1731  ExprVector ArgExprs(Actions);
1732  CommaLocsTy CommaLocs;
1733  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1734    SkipUntil(tok::r_paren);
1735    return true;
1736  }
1737
1738  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1739
1740  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1741                                     TemplateTypeTy, IdLoc,
1742                                     LParenLoc, ArgExprs.take(),
1743                                     ArgExprs.size(), CommaLocs.data(),
1744                                     RParenLoc);
1745}
1746
1747/// ParseExceptionSpecification - Parse a C++ exception-specification
1748/// (C++ [except.spec]).
1749///
1750///       exception-specification:
1751///         'throw' '(' type-id-list [opt] ')'
1752/// [MS]    'throw' '(' '...' ')'
1753///
1754///       type-id-list:
1755///         type-id
1756///         type-id-list ',' type-id
1757///
1758bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1759                                         llvm::SmallVector<TypeTy*, 2>
1760                                             &Exceptions,
1761                                         llvm::SmallVector<SourceRange, 2>
1762                                             &Ranges,
1763                                         bool &hasAnyExceptionSpec) {
1764  assert(Tok.is(tok::kw_throw) && "expected throw");
1765
1766  SourceLocation ThrowLoc = ConsumeToken();
1767
1768  if (!Tok.is(tok::l_paren)) {
1769    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1770  }
1771  SourceLocation LParenLoc = ConsumeParen();
1772
1773  // Parse throw(...), a Microsoft extension that means "this function
1774  // can throw anything".
1775  if (Tok.is(tok::ellipsis)) {
1776    hasAnyExceptionSpec = true;
1777    SourceLocation EllipsisLoc = ConsumeToken();
1778    if (!getLang().Microsoft)
1779      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1780    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1781    return false;
1782  }
1783
1784  // Parse the sequence of type-ids.
1785  SourceRange Range;
1786  while (Tok.isNot(tok::r_paren)) {
1787    TypeResult Res(ParseTypeName(&Range));
1788    if (!Res.isInvalid()) {
1789      Exceptions.push_back(Res.get());
1790      Ranges.push_back(Range);
1791    }
1792    if (Tok.is(tok::comma))
1793      ConsumeToken();
1794    else
1795      break;
1796  }
1797
1798  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1799  return false;
1800}
1801
1802/// \brief We have just started parsing the definition of a new class,
1803/// so push that class onto our stack of classes that is currently
1804/// being parsed.
1805void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) {
1806  assert((NonNestedClass || !ClassStack.empty()) &&
1807         "Nested class without outer class");
1808  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
1809}
1810
1811/// \brief Deallocate the given parsed class and all of its nested
1812/// classes.
1813void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1814  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1815    DeallocateParsedClasses(Class->NestedClasses[I]);
1816  delete Class;
1817}
1818
1819/// \brief Pop the top class of the stack of classes that are
1820/// currently being parsed.
1821///
1822/// This routine should be called when we have finished parsing the
1823/// definition of a class, but have not yet popped the Scope
1824/// associated with the class's definition.
1825///
1826/// \returns true if the class we've popped is a top-level class,
1827/// false otherwise.
1828void Parser::PopParsingClass() {
1829  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1830
1831  ParsingClass *Victim = ClassStack.top();
1832  ClassStack.pop();
1833  if (Victim->TopLevelClass) {
1834    // Deallocate all of the nested classes of this class,
1835    // recursively: we don't need to keep any of this information.
1836    DeallocateParsedClasses(Victim);
1837    return;
1838  }
1839  assert(!ClassStack.empty() && "Missing top-level class?");
1840
1841  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1842      Victim->NestedClasses.empty()) {
1843    // The victim is a nested class, but we will not need to perform
1844    // any processing after the definition of this class since it has
1845    // no members whose handling was delayed. Therefore, we can just
1846    // remove this nested class.
1847    delete Victim;
1848    return;
1849  }
1850
1851  // This nested class has some members that will need to be processed
1852  // after the top-level class is completely defined. Therefore, add
1853  // it to the list of nested classes within its parent.
1854  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1855  ClassStack.top()->NestedClasses.push_back(Victim);
1856  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1857}
1858
1859/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1860/// parses standard attributes.
1861///
1862/// [C++0x] attribute-specifier:
1863///         '[' '[' attribute-list ']' ']'
1864///
1865/// [C++0x] attribute-list:
1866///         attribute[opt]
1867///         attribute-list ',' attribute[opt]
1868///
1869/// [C++0x] attribute:
1870///         attribute-token attribute-argument-clause[opt]
1871///
1872/// [C++0x] attribute-token:
1873///         identifier
1874///         attribute-scoped-token
1875///
1876/// [C++0x] attribute-scoped-token:
1877///         attribute-namespace '::' identifier
1878///
1879/// [C++0x] attribute-namespace:
1880///         identifier
1881///
1882/// [C++0x] attribute-argument-clause:
1883///         '(' balanced-token-seq ')'
1884///
1885/// [C++0x] balanced-token-seq:
1886///         balanced-token
1887///         balanced-token-seq balanced-token
1888///
1889/// [C++0x] balanced-token:
1890///         '(' balanced-token-seq ')'
1891///         '[' balanced-token-seq ']'
1892///         '{' balanced-token-seq '}'
1893///         any token but '(', ')', '[', ']', '{', or '}'
1894CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1895  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1896      && "Not a C++0x attribute list");
1897
1898  SourceLocation StartLoc = Tok.getLocation(), Loc;
1899  AttributeList *CurrAttr = 0;
1900
1901  ConsumeBracket();
1902  ConsumeBracket();
1903
1904  if (Tok.is(tok::comma)) {
1905    Diag(Tok.getLocation(), diag::err_expected_ident);
1906    ConsumeToken();
1907  }
1908
1909  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1910    // attribute not present
1911    if (Tok.is(tok::comma)) {
1912      ConsumeToken();
1913      continue;
1914    }
1915
1916    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1917    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1918
1919    // scoped attribute
1920    if (Tok.is(tok::coloncolon)) {
1921      ConsumeToken();
1922
1923      if (!Tok.is(tok::identifier)) {
1924        Diag(Tok.getLocation(), diag::err_expected_ident);
1925        SkipUntil(tok::r_square, tok::comma, true, true);
1926        continue;
1927      }
1928
1929      ScopeName = AttrName;
1930      ScopeLoc = AttrLoc;
1931
1932      AttrName = Tok.getIdentifierInfo();
1933      AttrLoc = ConsumeToken();
1934    }
1935
1936    bool AttrParsed = false;
1937    // No scoped names are supported; ideally we could put all non-standard
1938    // attributes into namespaces.
1939    if (!ScopeName) {
1940      switch(AttributeList::getKind(AttrName))
1941      {
1942      // No arguments
1943      case AttributeList::AT_base_check:
1944      case AttributeList::AT_carries_dependency:
1945      case AttributeList::AT_final:
1946      case AttributeList::AT_hiding:
1947      case AttributeList::AT_noreturn:
1948      case AttributeList::AT_override: {
1949        if (Tok.is(tok::l_paren)) {
1950          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
1951            << AttrName->getName();
1952          break;
1953        }
1954
1955        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
1956                                     SourceLocation(), 0, 0, CurrAttr, false,
1957                                     true);
1958        AttrParsed = true;
1959        break;
1960      }
1961
1962      // One argument; must be a type-id or assignment-expression
1963      case AttributeList::AT_aligned: {
1964        if (Tok.isNot(tok::l_paren)) {
1965          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
1966            << AttrName->getName();
1967          break;
1968        }
1969        SourceLocation ParamLoc = ConsumeParen();
1970
1971        OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
1972
1973        MatchRHSPunctuation(tok::r_paren, ParamLoc);
1974
1975        ExprVector ArgExprs(Actions);
1976        ArgExprs.push_back(ArgExpr.release());
1977        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
1978                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
1979                                     false, true);
1980
1981        AttrParsed = true;
1982        break;
1983      }
1984
1985      // Silence warnings
1986      default: break;
1987      }
1988    }
1989
1990    // Skip the entire parameter clause, if any
1991    if (!AttrParsed && Tok.is(tok::l_paren)) {
1992      ConsumeParen();
1993      // SkipUntil maintains the balancedness of tokens.
1994      SkipUntil(tok::r_paren, false);
1995    }
1996  }
1997
1998  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1999    SkipUntil(tok::r_square, false);
2000  Loc = Tok.getLocation();
2001  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2002    SkipUntil(tok::r_square, false);
2003
2004  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
2005  return Attr;
2006}
2007
2008/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
2009/// attribute.
2010///
2011/// FIXME: Simply returns an alignof() expression if the argument is a
2012/// type. Ideally, the type should be propagated directly into Sema.
2013///
2014/// [C++0x] 'align' '(' type-id ')'
2015/// [C++0x] 'align' '(' assignment-expression ')'
2016Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2017  if (isTypeIdInParens()) {
2018    EnterExpressionEvaluationContext Unevaluated(Actions,
2019                                                  Action::Unevaluated);
2020    SourceLocation TypeLoc = Tok.getLocation();
2021    TypeTy *Ty = ParseTypeName().get();
2022    SourceRange TypeRange(Start, Tok.getLocation());
2023    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty,
2024                                              TypeRange);
2025  } else
2026    return ParseConstantExpression();
2027}
2028