ParseDeclCXX.cpp revision 33f992425213f381fc503699b26ee8cf9b60494e 
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  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    ConsumeToken();
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    ConsumeToken();
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    ConsumeToken();
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    ConsumeToken();
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)) {
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
718    }
719  } else if (Tok.is(tok::annot_template_id)) {
720    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
721    NameLoc = ConsumeToken();
722
723    if (TemplateId->Kind != TNK_Type_template) {
724      // The template-name in the simple-template-id refers to
725      // something other than a class template. Give an appropriate
726      // error message and skip to the ';'.
727      SourceRange Range(NameLoc);
728      if (SS.isNotEmpty())
729        Range.setBegin(SS.getBeginLoc());
730
731      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
732        << Name << static_cast<int>(TemplateId->Kind) << Range;
733
734      DS.SetTypeSpecError();
735      SkipUntil(tok::semi, false, true);
736      TemplateId->Destroy();
737      return;
738    }
739  }
740
741  // There are four options here.  If we have 'struct foo;', then this
742  // is either a forward declaration or a friend declaration, which
743  // have to be treated differently.  If we have 'struct foo {...' or
744  // 'struct foo :...' then this is a definition. Otherwise we have
745  // something like 'struct foo xyz', a reference.
746  // However, in some contexts, things look like declarations but are just
747  // references, e.g.
748  // new struct s;
749  // or
750  // &T::operator struct s;
751  // For these, SuppressDeclarations is true.
752  Action::TagUseKind TUK;
753  if (SuppressDeclarations)
754    TUK = Action::TUK_Reference;
755  else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
756    if (DS.isFriendSpecified()) {
757      // C++ [class.friend]p2:
758      //   A class shall not be defined in a friend declaration.
759      Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
760        << SourceRange(DS.getFriendSpecLoc());
761
762      // Skip everything up to the semicolon, so that this looks like a proper
763      // friend class (or template thereof) declaration.
764      SkipUntil(tok::semi, true, true);
765      TUK = Action::TUK_Friend;
766    } else {
767      // Okay, this is a class definition.
768      TUK = Action::TUK_Definition;
769    }
770  } else if (Tok.is(tok::semi))
771    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
772  else
773    TUK = Action::TUK_Reference;
774
775  if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
776    // We have a declaration or reference to an anonymous class.
777    Diag(StartLoc, diag::err_anon_type_definition)
778      << DeclSpec::getSpecifierName(TagType);
779
780    SkipUntil(tok::comma, true);
781
782    if (TemplateId)
783      TemplateId->Destroy();
784    return;
785  }
786
787  // Create the tag portion of the class or class template.
788  Action::DeclResult TagOrTempResult = true; // invalid
789  Action::TypeResult TypeResult = true; // invalid
790
791  bool Owned = false;
792  if (TemplateId) {
793    // Explicit specialization, class template partial specialization,
794    // or explicit instantiation.
795    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
796                                       TemplateId->getTemplateArgs(),
797                                       TemplateId->NumArgs);
798    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
799        TUK == Action::TUK_Declaration) {
800      // This is an explicit instantiation of a class template.
801      TagOrTempResult
802        = Actions.ActOnExplicitInstantiation(CurScope,
803                                             TemplateInfo.ExternLoc,
804                                             TemplateInfo.TemplateLoc,
805                                             TagType,
806                                             StartLoc,
807                                             SS,
808                                     TemplateTy::make(TemplateId->Template),
809                                             TemplateId->TemplateNameLoc,
810                                             TemplateId->LAngleLoc,
811                                             TemplateArgsPtr,
812                                             TemplateId->RAngleLoc,
813                                             AttrList);
814
815    // Friend template-ids are treated as references unless
816    // they have template headers, in which case they're ill-formed
817    // (FIXME: "template <class T> friend class A<T>::B<int>;").
818    // We diagnose this error in ActOnClassTemplateSpecialization.
819    } else if (TUK == Action::TUK_Reference ||
820               (TUK == Action::TUK_Friend &&
821                TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
822      TypeResult
823        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
824                                      TemplateId->TemplateNameLoc,
825                                      TemplateId->LAngleLoc,
826                                      TemplateArgsPtr,
827                                      TemplateId->RAngleLoc);
828
829      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
830                                                  TagType, StartLoc);
831    } else {
832      // This is an explicit specialization or a class template
833      // partial specialization.
834      TemplateParameterLists FakedParamLists;
835
836      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
837        // This looks like an explicit instantiation, because we have
838        // something like
839        //
840        //   template class Foo<X>
841        //
842        // but it actually has a definition. Most likely, this was
843        // meant to be an explicit specialization, but the user forgot
844        // the '<>' after 'template'.
845        assert(TUK == Action::TUK_Definition && "Expected a definition here");
846
847        SourceLocation LAngleLoc
848          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
849        Diag(TemplateId->TemplateNameLoc,
850             diag::err_explicit_instantiation_with_definition)
851          << SourceRange(TemplateInfo.TemplateLoc)
852          << FixItHint::CreateInsertion(LAngleLoc, "<>");
853
854        // Create a fake template parameter list that contains only
855        // "template<>", so that we treat this construct as a class
856        // template specialization.
857        FakedParamLists.push_back(
858          Actions.ActOnTemplateParameterList(0, SourceLocation(),
859                                             TemplateInfo.TemplateLoc,
860                                             LAngleLoc,
861                                             0, 0,
862                                             LAngleLoc));
863        TemplateParams = &FakedParamLists;
864      }
865
866      // Build the class template specialization.
867      TagOrTempResult
868        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
869                       StartLoc, SS,
870                       TemplateTy::make(TemplateId->Template),
871                       TemplateId->TemplateNameLoc,
872                       TemplateId->LAngleLoc,
873                       TemplateArgsPtr,
874                       TemplateId->RAngleLoc,
875                       AttrList,
876                       Action::MultiTemplateParamsArg(Actions,
877                                    TemplateParams? &(*TemplateParams)[0] : 0,
878                                 TemplateParams? TemplateParams->size() : 0));
879    }
880    TemplateId->Destroy();
881  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
882             TUK == Action::TUK_Declaration) {
883    // Explicit instantiation of a member of a class template
884    // specialization, e.g.,
885    //
886    //   template struct Outer<int>::Inner;
887    //
888    TagOrTempResult
889      = Actions.ActOnExplicitInstantiation(CurScope,
890                                           TemplateInfo.ExternLoc,
891                                           TemplateInfo.TemplateLoc,
892                                           TagType, StartLoc, SS, Name,
893                                           NameLoc, AttrList);
894  } else {
895    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
896        TUK == Action::TUK_Definition) {
897      // FIXME: Diagnose this particular error.
898    }
899
900    bool IsDependent = false;
901
902    // Declaration or definition of a class type
903    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
904                                       Name, NameLoc, AttrList, AS,
905                                  Action::MultiTemplateParamsArg(Actions,
906                                    TemplateParams? &(*TemplateParams)[0] : 0,
907                                    TemplateParams? TemplateParams->size() : 0),
908                                       Owned, IsDependent);
909
910    // If ActOnTag said the type was dependent, try again with the
911    // less common call.
912    if (IsDependent)
913      TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
914                                             SS, Name, StartLoc, NameLoc);
915  }
916
917  // If there is a body, parse it and inform the actions module.
918  if (TUK == Action::TUK_Definition) {
919    assert(Tok.is(tok::l_brace) ||
920           (getLang().CPlusPlus && Tok.is(tok::colon)));
921    if (getLang().CPlusPlus)
922      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
923    else
924      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
925  }
926
927  void *Result;
928  if (!TypeResult.isInvalid()) {
929    TagType = DeclSpec::TST_typename;
930    Result = TypeResult.get();
931    Owned = false;
932  } else if (!TagOrTempResult.isInvalid()) {
933    Result = TagOrTempResult.get().getAs<void>();
934  } else {
935    DS.SetTypeSpecError();
936    return;
937  }
938
939  const char *PrevSpec = 0;
940  unsigned DiagID;
941
942  // FIXME: The DeclSpec should keep the locations of both the keyword and the
943  // name (if there is one).
944  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
945
946  if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
947                         Result, Owned))
948    Diag(StartLoc, DiagID) << PrevSpec;
949
950  // At this point, we've successfully parsed a class-specifier in 'definition'
951  // form (e.g. "struct foo { int x; }".  While we could just return here, we're
952  // going to look at what comes after it to improve error recovery.  If an
953  // impossible token occurs next, we assume that the programmer forgot a ; at
954  // the end of the declaration and recover that way.
955  //
956  // This switch enumerates the valid "follow" set for definition.
957  if (TUK == Action::TUK_Definition) {
958    bool ExpectedSemi = true;
959    switch (Tok.getKind()) {
960    default: break;
961    case tok::semi:               // struct foo {...} ;
962    case tok::star:               // struct foo {...} *         P;
963    case tok::amp:                // struct foo {...} &         R = ...
964    case tok::identifier:         // struct foo {...} V         ;
965    case tok::r_paren:            //(struct foo {...} )         {4}
966    case tok::annot_cxxscope:     // struct foo {...} a::       b;
967    case tok::annot_typename:     // struct foo {...} a         ::b;
968    case tok::annot_template_id:  // struct foo {...} a<int>    ::b;
969    case tok::l_paren:            // struct foo {...} (         x);
970    case tok::comma:              // __builtin_offsetof(struct foo{...} ,
971      ExpectedSemi = false;
972      break;
973    // Type qualifiers
974    case tok::kw_const:           // struct foo {...} const     x;
975    case tok::kw_volatile:        // struct foo {...} volatile  x;
976    case tok::kw_restrict:        // struct foo {...} restrict  x;
977    case tok::kw_inline:          // struct foo {...} inline    foo() {};
978    // Storage-class specifiers
979    case tok::kw_static:          // struct foo {...} static    x;
980    case tok::kw_extern:          // struct foo {...} extern    x;
981    case tok::kw_typedef:         // struct foo {...} typedef   x;
982    case tok::kw_register:        // struct foo {...} register  x;
983    case tok::kw_auto:            // struct foo {...} auto      x;
984    case tok::kw_mutable:         // struct foo {...} mutable      x;
985      // As shown above, type qualifiers and storage class specifiers absolutely
986      // can occur after class specifiers according to the grammar.  However,
987      // almost noone actually writes code like this.  If we see one of these,
988      // it is much more likely that someone missed a semi colon and the
989      // type/storage class specifier we're seeing is part of the *next*
990      // intended declaration, as in:
991      //
992      //   struct foo { ... }
993      //   typedef int X;
994      //
995      // We'd really like to emit a missing semicolon error instead of emitting
996      // an error on the 'int' saying that you can't have two type specifiers in
997      // the same declaration of X.  Because of this, we look ahead past this
998      // token to see if it's a type specifier.  If so, we know the code is
999      // otherwise invalid, so we can produce the expected semi error.
1000      if (!isKnownToBeTypeSpecifier(NextToken()))
1001        ExpectedSemi = false;
1002      break;
1003
1004    case tok::r_brace:  // struct bar { struct foo {...} }
1005      // Missing ';' at end of struct is accepted as an extension in C mode.
1006      if (!getLang().CPlusPlus)
1007        ExpectedSemi = false;
1008      break;
1009    }
1010
1011    if (ExpectedSemi) {
1012      ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1013                       TagType == DeclSpec::TST_class ? "class"
1014                       : TagType == DeclSpec::TST_struct? "struct" : "union");
1015      // Push this token back into the preprocessor and change our current token
1016      // to ';' so that the rest of the code recovers as though there were an
1017      // ';' after the definition.
1018      PP.EnterToken(Tok);
1019      Tok.setKind(tok::semi);
1020    }
1021  }
1022}
1023
1024/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1025///
1026///       base-clause : [C++ class.derived]
1027///         ':' base-specifier-list
1028///       base-specifier-list:
1029///         base-specifier '...'[opt]
1030///         base-specifier-list ',' base-specifier '...'[opt]
1031void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
1032  assert(Tok.is(tok::colon) && "Not a base clause");
1033  ConsumeToken();
1034
1035  // Build up an array of parsed base specifiers.
1036  llvm::SmallVector<BaseTy *, 8> BaseInfo;
1037
1038  while (true) {
1039    // Parse a base-specifier.
1040    BaseResult Result = ParseBaseSpecifier(ClassDecl);
1041    if (Result.isInvalid()) {
1042      // Skip the rest of this base specifier, up until the comma or
1043      // opening brace.
1044      SkipUntil(tok::comma, tok::l_brace, true, true);
1045    } else {
1046      // Add this to our array of base specifiers.
1047      BaseInfo.push_back(Result.get());
1048    }
1049
1050    // If the next token is a comma, consume it and keep reading
1051    // base-specifiers.
1052    if (Tok.isNot(tok::comma)) break;
1053
1054    // Consume the comma.
1055    ConsumeToken();
1056  }
1057
1058  // Attach the base specifiers
1059  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1060}
1061
1062/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1063/// one entry in the base class list of a class specifier, for example:
1064///    class foo : public bar, virtual private baz {
1065/// 'public bar' and 'virtual private baz' are each base-specifiers.
1066///
1067///       base-specifier: [C++ class.derived]
1068///         ::[opt] nested-name-specifier[opt] class-name
1069///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1070///                        class-name
1071///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1072///                        class-name
1073Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
1074  bool IsVirtual = false;
1075  SourceLocation StartLoc = Tok.getLocation();
1076
1077  // Parse the 'virtual' keyword.
1078  if (Tok.is(tok::kw_virtual))  {
1079    ConsumeToken();
1080    IsVirtual = true;
1081  }
1082
1083  // Parse an (optional) access specifier.
1084  AccessSpecifier Access = getAccessSpecifierIfPresent();
1085  if (Access != AS_none)
1086    ConsumeToken();
1087
1088  // Parse the 'virtual' keyword (again!), in case it came after the
1089  // access specifier.
1090  if (Tok.is(tok::kw_virtual))  {
1091    SourceLocation VirtualLoc = ConsumeToken();
1092    if (IsVirtual) {
1093      // Complain about duplicate 'virtual'
1094      Diag(VirtualLoc, diag::err_dup_virtual)
1095        << FixItHint::CreateRemoval(VirtualLoc);
1096    }
1097
1098    IsVirtual = true;
1099  }
1100
1101  // Parse optional '::' and optional nested-name-specifier.
1102  CXXScopeSpec SS;
1103  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0,
1104                                 /*EnteringContext=*/false);
1105
1106  // The location of the base class itself.
1107  SourceLocation BaseLoc = Tok.getLocation();
1108
1109  // Parse the class-name.
1110  SourceLocation EndLocation;
1111  TypeResult BaseType = ParseClassName(EndLocation, &SS);
1112  if (BaseType.isInvalid())
1113    return true;
1114
1115  // Find the complete source range for the base-specifier.
1116  SourceRange Range(StartLoc, EndLocation);
1117
1118  // Notify semantic analysis that we have parsed a complete
1119  // base-specifier.
1120  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1121                                    BaseType.get(), BaseLoc);
1122}
1123
1124/// getAccessSpecifierIfPresent - Determine whether the next token is
1125/// a C++ access-specifier.
1126///
1127///       access-specifier: [C++ class.derived]
1128///         'private'
1129///         'protected'
1130///         'public'
1131AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1132  switch (Tok.getKind()) {
1133  default: return AS_none;
1134  case tok::kw_private: return AS_private;
1135  case tok::kw_protected: return AS_protected;
1136  case tok::kw_public: return AS_public;
1137  }
1138}
1139
1140void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1141                                             DeclPtrTy ThisDecl) {
1142  // We just declared a member function. If this member function
1143  // has any default arguments, we'll need to parse them later.
1144  LateParsedMethodDeclaration *LateMethod = 0;
1145  DeclaratorChunk::FunctionTypeInfo &FTI
1146    = DeclaratorInfo.getTypeObject(0).Fun;
1147  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1148    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1149      if (!LateMethod) {
1150        // Push this method onto the stack of late-parsed method
1151        // declarations.
1152        getCurrentClass().MethodDecls.push_back(
1153                                LateParsedMethodDeclaration(ThisDecl));
1154        LateMethod = &getCurrentClass().MethodDecls.back();
1155        LateMethod->TemplateScope = CurScope->isTemplateParamScope();
1156
1157        // Add all of the parameters prior to this one (they don't
1158        // have default arguments).
1159        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1160        for (unsigned I = 0; I < ParamIdx; ++I)
1161          LateMethod->DefaultArgs.push_back(
1162                             LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1163      }
1164
1165      // Add this parameter to the list of parameters (it or may
1166      // not have a default argument).
1167      LateMethod->DefaultArgs.push_back(
1168        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1169                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1170    }
1171  }
1172}
1173
1174/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1175///
1176///       member-declaration:
1177///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
1178///         function-definition ';'[opt]
1179///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1180///         using-declaration                                            [TODO]
1181/// [C++0x] static_assert-declaration
1182///         template-declaration
1183/// [GNU]   '__extension__' member-declaration
1184///
1185///       member-declarator-list:
1186///         member-declarator
1187///         member-declarator-list ',' member-declarator
1188///
1189///       member-declarator:
1190///         declarator pure-specifier[opt]
1191///         declarator constant-initializer[opt]
1192///         identifier[opt] ':' constant-expression
1193///
1194///       pure-specifier:
1195///         '= 0'
1196///
1197///       constant-initializer:
1198///         '=' constant-expression
1199///
1200void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1201                                       const ParsedTemplateInfo &TemplateInfo) {
1202  // Access declarations.
1203  if (!TemplateInfo.Kind &&
1204      (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1205      !TryAnnotateCXXScopeToken() &&
1206      Tok.is(tok::annot_cxxscope)) {
1207    bool isAccessDecl = false;
1208    if (NextToken().is(tok::identifier))
1209      isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1210    else
1211      isAccessDecl = NextToken().is(tok::kw_operator);
1212
1213    if (isAccessDecl) {
1214      // Collect the scope specifier token we annotated earlier.
1215      CXXScopeSpec SS;
1216      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
1217
1218      // Try to parse an unqualified-id.
1219      UnqualifiedId Name;
1220      if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
1221        SkipUntil(tok::semi);
1222        return;
1223      }
1224
1225      // TODO: recover from mistakenly-qualified operator declarations.
1226      if (ExpectAndConsume(tok::semi,
1227                           diag::err_expected_semi_after,
1228                           "access declaration",
1229                           tok::semi))
1230        return;
1231
1232      Actions.ActOnUsingDeclaration(CurScope, AS,
1233                                    false, SourceLocation(),
1234                                    SS, Name,
1235                                    /* AttrList */ 0,
1236                                    /* IsTypeName */ false,
1237                                    SourceLocation());
1238      return;
1239    }
1240  }
1241
1242  // static_assert-declaration
1243  if (Tok.is(tok::kw_static_assert)) {
1244    // FIXME: Check for templates
1245    SourceLocation DeclEnd;
1246    ParseStaticAssertDeclaration(DeclEnd);
1247    return;
1248  }
1249
1250  if (Tok.is(tok::kw_template)) {
1251    assert(!TemplateInfo.TemplateParams &&
1252           "Nested template improperly parsed?");
1253    SourceLocation DeclEnd;
1254    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1255                                         AS);
1256    return;
1257  }
1258
1259  // Handle:  member-declaration ::= '__extension__' member-declaration
1260  if (Tok.is(tok::kw___extension__)) {
1261    // __extension__ silences extension warnings in the subexpression.
1262    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1263    ConsumeToken();
1264    return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
1265  }
1266
1267  // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1268  // is a bitfield.
1269  ColonProtectionRAIIObject X(*this);
1270
1271  CXX0XAttributeList AttrList;
1272  // Optional C++0x attribute-specifier
1273  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
1274    AttrList = ParseCXX0XAttributes();
1275
1276  if (Tok.is(tok::kw_using)) {
1277    // FIXME: Check for template aliases
1278
1279    if (AttrList.HasAttr)
1280      Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
1281        << AttrList.Range;
1282
1283    // Eat 'using'.
1284    SourceLocation UsingLoc = ConsumeToken();
1285
1286    if (Tok.is(tok::kw_namespace)) {
1287      Diag(UsingLoc, diag::err_using_namespace_in_class);
1288      SkipUntil(tok::semi, true, true);
1289    } else {
1290      SourceLocation DeclEnd;
1291      // Otherwise, it must be using-declaration.
1292      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1293    }
1294    return;
1295  }
1296
1297  SourceLocation DSStart = Tok.getLocation();
1298  // decl-specifier-seq:
1299  // Parse the common declaration-specifiers piece.
1300  ParsingDeclSpec DS(*this);
1301  DS.AddAttributes(AttrList.AttrList);
1302  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1303
1304  Action::MultiTemplateParamsArg TemplateParams(Actions,
1305      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1306      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1307
1308  if (Tok.is(tok::semi)) {
1309    ConsumeToken();
1310    Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1311    return;
1312  }
1313
1314  ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1315
1316  if (Tok.isNot(tok::colon)) {
1317    // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1318    ColonProtectionRAIIObject X(*this);
1319
1320    // Parse the first declarator.
1321    ParseDeclarator(DeclaratorInfo);
1322    // Error parsing the declarator?
1323    if (!DeclaratorInfo.hasName()) {
1324      // If so, skip until the semi-colon or a }.
1325      SkipUntil(tok::r_brace, true);
1326      if (Tok.is(tok::semi))
1327        ConsumeToken();
1328      return;
1329    }
1330
1331    // If attributes exist after the declarator, but before an '{', parse them.
1332    if (Tok.is(tok::kw___attribute)) {
1333      SourceLocation Loc;
1334      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1335      DeclaratorInfo.AddAttributes(AttrList, Loc);
1336    }
1337
1338    // function-definition:
1339    if (Tok.is(tok::l_brace)
1340        || (DeclaratorInfo.isFunctionDeclarator() &&
1341            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1342      if (!DeclaratorInfo.isFunctionDeclarator()) {
1343        Diag(Tok, diag::err_func_def_no_params);
1344        ConsumeBrace();
1345        SkipUntil(tok::r_brace, true);
1346        return;
1347      }
1348
1349      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1350        Diag(Tok, diag::err_function_declared_typedef);
1351        // This recovery skips the entire function body. It would be nice
1352        // to simply call ParseCXXInlineMethodDef() below, however Sema
1353        // assumes the declarator represents a function, not a typedef.
1354        ConsumeBrace();
1355        SkipUntil(tok::r_brace, true);
1356        return;
1357      }
1358
1359      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1360      return;
1361    }
1362  }
1363
1364  // member-declarator-list:
1365  //   member-declarator
1366  //   member-declarator-list ',' member-declarator
1367
1368  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1369  OwningExprResult BitfieldSize(Actions);
1370  OwningExprResult Init(Actions);
1371  bool Deleted = false;
1372
1373  while (1) {
1374    // member-declarator:
1375    //   declarator pure-specifier[opt]
1376    //   declarator constant-initializer[opt]
1377    //   identifier[opt] ':' constant-expression
1378
1379    if (Tok.is(tok::colon)) {
1380      ConsumeToken();
1381      BitfieldSize = ParseConstantExpression();
1382      if (BitfieldSize.isInvalid())
1383        SkipUntil(tok::comma, true, true);
1384    }
1385
1386    // pure-specifier:
1387    //   '= 0'
1388    //
1389    // constant-initializer:
1390    //   '=' constant-expression
1391    //
1392    // defaulted/deleted function-definition:
1393    //   '=' 'default'                          [TODO]
1394    //   '=' 'delete'
1395
1396    if (Tok.is(tok::equal)) {
1397      ConsumeToken();
1398      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1399        ConsumeToken();
1400        Deleted = true;
1401      } else {
1402        Init = ParseInitializer();
1403        if (Init.isInvalid())
1404          SkipUntil(tok::comma, true, true);
1405      }
1406    }
1407
1408    // If attributes exist after the declarator, parse them.
1409    if (Tok.is(tok::kw___attribute)) {
1410      SourceLocation Loc;
1411      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1412      DeclaratorInfo.AddAttributes(AttrList, Loc);
1413    }
1414
1415    // NOTE: If Sema is the Action module and declarator is an instance field,
1416    // this call will *not* return the created decl; It will return null.
1417    // See Sema::ActOnCXXMemberDeclarator for details.
1418
1419    DeclPtrTy ThisDecl;
1420    if (DS.isFriendSpecified()) {
1421      // TODO: handle initializers, bitfields, 'delete'
1422      ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
1423                                                 /*IsDefinition*/ false,
1424                                                 move(TemplateParams));
1425    } else {
1426      ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1427                                                  DeclaratorInfo,
1428                                                  move(TemplateParams),
1429                                                  BitfieldSize.release(),
1430                                                  Init.release(),
1431                                                  /*IsDefinition*/Deleted,
1432                                                  Deleted);
1433    }
1434    if (ThisDecl)
1435      DeclsInGroup.push_back(ThisDecl);
1436
1437    if (DeclaratorInfo.isFunctionDeclarator() &&
1438        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1439          != DeclSpec::SCS_typedef) {
1440      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1441    }
1442
1443    DeclaratorInfo.complete(ThisDecl);
1444
1445    // If we don't have a comma, it is either the end of the list (a ';')
1446    // or an error, bail out.
1447    if (Tok.isNot(tok::comma))
1448      break;
1449
1450    // Consume the comma.
1451    ConsumeToken();
1452
1453    // Parse the next declarator.
1454    DeclaratorInfo.clear();
1455    BitfieldSize = 0;
1456    Init = 0;
1457    Deleted = false;
1458
1459    // Attributes are only allowed on the second declarator.
1460    if (Tok.is(tok::kw___attribute)) {
1461      SourceLocation Loc;
1462      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1463      DeclaratorInfo.AddAttributes(AttrList, Loc);
1464    }
1465
1466    if (Tok.isNot(tok::colon))
1467      ParseDeclarator(DeclaratorInfo);
1468  }
1469
1470  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1471    // Skip to end of block or statement.
1472    SkipUntil(tok::r_brace, true, true);
1473    // If we stopped at a ';', eat it.
1474    if (Tok.is(tok::semi)) ConsumeToken();
1475    return;
1476  }
1477
1478  Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1479                                  DeclsInGroup.size());
1480}
1481
1482/// ParseCXXMemberSpecification - Parse the class definition.
1483///
1484///       member-specification:
1485///         member-declaration member-specification[opt]
1486///         access-specifier ':' member-specification[opt]
1487///
1488void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1489                                         unsigned TagType, DeclPtrTy TagDecl) {
1490  assert((TagType == DeclSpec::TST_struct ||
1491         TagType == DeclSpec::TST_union  ||
1492         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1493
1494  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1495                                        PP.getSourceManager(),
1496                                        "parsing struct/union/class body");
1497
1498  // Determine whether this is a non-nested class. Note that local
1499  // classes are *not* considered to be nested classes.
1500  bool NonNestedClass = true;
1501  if (!ClassStack.empty()) {
1502    for (const Scope *S = CurScope; S; S = S->getParent()) {
1503      if (S->isClassScope()) {
1504        // We're inside a class scope, so this is a nested class.
1505        NonNestedClass = false;
1506        break;
1507      }
1508
1509      if ((S->getFlags() & Scope::FnScope)) {
1510        // If we're in a function or function template declared in the
1511        // body of a class, then this is a local class rather than a
1512        // nested class.
1513        const Scope *Parent = S->getParent();
1514        if (Parent->isTemplateParamScope())
1515          Parent = Parent->getParent();
1516        if (Parent->isClassScope())
1517          break;
1518      }
1519    }
1520  }
1521
1522  // Enter a scope for the class.
1523  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1524
1525  // Note that we are parsing a new (potentially-nested) class definition.
1526  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
1527
1528  if (TagDecl)
1529    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1530
1531  if (Tok.is(tok::colon)) {
1532    ParseBaseClause(TagDecl);
1533
1534    if (!Tok.is(tok::l_brace)) {
1535      Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
1536
1537      if (TagDecl)
1538        Actions.ActOnTagDefinitionError(CurScope, TagDecl);
1539      return;
1540    }
1541  }
1542
1543  assert(Tok.is(tok::l_brace));
1544
1545  SourceLocation LBraceLoc = ConsumeBrace();
1546
1547  if (!TagDecl) {
1548    SkipUntil(tok::r_brace, false, false);
1549    return;
1550  }
1551
1552  Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc);
1553
1554  // C++ 11p3: Members of a class defined with the keyword class are private
1555  // by default. Members of a class defined with the keywords struct or union
1556  // are public by default.
1557  AccessSpecifier CurAS;
1558  if (TagType == DeclSpec::TST_class)
1559    CurAS = AS_private;
1560  else
1561    CurAS = AS_public;
1562
1563  // While we still have something to read, read the member-declarations.
1564  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1565    // Each iteration of this loop reads one member-declaration.
1566
1567    // Check for extraneous top-level semicolon.
1568    if (Tok.is(tok::semi)) {
1569      Diag(Tok, diag::ext_extra_struct_semi)
1570        << FixItHint::CreateRemoval(Tok.getLocation());
1571      ConsumeToken();
1572      continue;
1573    }
1574
1575    AccessSpecifier AS = getAccessSpecifierIfPresent();
1576    if (AS != AS_none) {
1577      // Current token is a C++ access specifier.
1578      CurAS = AS;
1579      ConsumeToken();
1580      ExpectAndConsume(tok::colon, diag::err_expected_colon);
1581      continue;
1582    }
1583
1584    // FIXME: Make sure we don't have a template here.
1585
1586    // Parse all the comma separated declarators.
1587    ParseCXXClassMemberDeclaration(CurAS);
1588  }
1589
1590  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1591
1592  // If attributes exist after class contents, parse them.
1593  llvm::OwningPtr<AttributeList> AttrList;
1594  if (Tok.is(tok::kw___attribute))
1595    AttrList.reset(ParseGNUAttributes());
1596
1597  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1598                                            LBraceLoc, RBraceLoc,
1599                                            AttrList.get());
1600
1601  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1602  // complete within function bodies, default arguments,
1603  // exception-specifications, and constructor ctor-initializers (including
1604  // such things in nested classes).
1605  //
1606  // FIXME: Only function bodies and constructor ctor-initializers are
1607  // parsed correctly, fix the rest.
1608  if (NonNestedClass) {
1609    // We are not inside a nested class. This class and its nested classes
1610    // are complete and we can parse the delayed portions of method
1611    // declarations and the lexed inline method definitions.
1612    ParseLexedMethodDeclarations(getCurrentClass());
1613    ParseLexedMethodDefs(getCurrentClass());
1614  }
1615
1616  Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1617
1618  // Leave the class scope.
1619  ParsingDef.Pop();
1620  ClassScope.Exit();
1621}
1622
1623/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1624/// which explicitly initializes the members or base classes of a
1625/// class (C++ [class.base.init]). For example, the three initializers
1626/// after the ':' in the Derived constructor below:
1627///
1628/// @code
1629/// class Base { };
1630/// class Derived : Base {
1631///   int x;
1632///   float f;
1633/// public:
1634///   Derived(float f) : Base(), x(17), f(f) { }
1635/// };
1636/// @endcode
1637///
1638/// [C++]  ctor-initializer:
1639///          ':' mem-initializer-list
1640///
1641/// [C++]  mem-initializer-list:
1642///          mem-initializer
1643///          mem-initializer , mem-initializer-list
1644void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1645  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1646
1647  SourceLocation ColonLoc = ConsumeToken();
1648
1649  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1650  bool AnyErrors = false;
1651
1652  do {
1653    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1654    if (!MemInit.isInvalid())
1655      MemInitializers.push_back(MemInit.get());
1656    else
1657      AnyErrors = true;
1658
1659    if (Tok.is(tok::comma))
1660      ConsumeToken();
1661    else if (Tok.is(tok::l_brace))
1662      break;
1663    else {
1664      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1665      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1666      SkipUntil(tok::l_brace, true, true);
1667      break;
1668    }
1669  } while (true);
1670
1671  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1672                               MemInitializers.data(), MemInitializers.size(),
1673                               AnyErrors);
1674}
1675
1676/// ParseMemInitializer - Parse a C++ member initializer, which is
1677/// part of a constructor initializer that explicitly initializes one
1678/// member or base class (C++ [class.base.init]). See
1679/// ParseConstructorInitializer for an example.
1680///
1681/// [C++] mem-initializer:
1682///         mem-initializer-id '(' expression-list[opt] ')'
1683///
1684/// [C++] mem-initializer-id:
1685///         '::'[opt] nested-name-specifier[opt] class-name
1686///         identifier
1687Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1688  // parse '::'[opt] nested-name-specifier[opt]
1689  CXXScopeSpec SS;
1690  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1691  TypeTy *TemplateTypeTy = 0;
1692  if (Tok.is(tok::annot_template_id)) {
1693    TemplateIdAnnotation *TemplateId
1694      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1695    if (TemplateId->Kind == TNK_Type_template ||
1696        TemplateId->Kind == TNK_Dependent_template_name) {
1697      AnnotateTemplateIdTokenAsType(&SS);
1698      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1699      TemplateTypeTy = Tok.getAnnotationValue();
1700    }
1701  }
1702  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1703    Diag(Tok, diag::err_expected_member_or_base_name);
1704    return true;
1705  }
1706
1707  // Get the identifier. This may be a member name or a class name,
1708  // but we'll let the semantic analysis determine which it is.
1709  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1710  SourceLocation IdLoc = ConsumeToken();
1711
1712  // Parse the '('.
1713  if (Tok.isNot(tok::l_paren)) {
1714    Diag(Tok, diag::err_expected_lparen);
1715    return true;
1716  }
1717  SourceLocation LParenLoc = ConsumeParen();
1718
1719  // Parse the optional expression-list.
1720  ExprVector ArgExprs(Actions);
1721  CommaLocsTy CommaLocs;
1722  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1723    SkipUntil(tok::r_paren);
1724    return true;
1725  }
1726
1727  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1728
1729  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1730                                     TemplateTypeTy, IdLoc,
1731                                     LParenLoc, ArgExprs.take(),
1732                                     ArgExprs.size(), CommaLocs.data(),
1733                                     RParenLoc);
1734}
1735
1736/// ParseExceptionSpecification - Parse a C++ exception-specification
1737/// (C++ [except.spec]).
1738///
1739///       exception-specification:
1740///         'throw' '(' type-id-list [opt] ')'
1741/// [MS]    'throw' '(' '...' ')'
1742///
1743///       type-id-list:
1744///         type-id
1745///         type-id-list ',' type-id
1746///
1747bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1748                                         llvm::SmallVector<TypeTy*, 2>
1749                                             &Exceptions,
1750                                         llvm::SmallVector<SourceRange, 2>
1751                                             &Ranges,
1752                                         bool &hasAnyExceptionSpec) {
1753  assert(Tok.is(tok::kw_throw) && "expected throw");
1754
1755  SourceLocation ThrowLoc = ConsumeToken();
1756
1757  if (!Tok.is(tok::l_paren)) {
1758    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1759  }
1760  SourceLocation LParenLoc = ConsumeParen();
1761
1762  // Parse throw(...), a Microsoft extension that means "this function
1763  // can throw anything".
1764  if (Tok.is(tok::ellipsis)) {
1765    hasAnyExceptionSpec = true;
1766    SourceLocation EllipsisLoc = ConsumeToken();
1767    if (!getLang().Microsoft)
1768      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1769    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1770    return false;
1771  }
1772
1773  // Parse the sequence of type-ids.
1774  SourceRange Range;
1775  while (Tok.isNot(tok::r_paren)) {
1776    TypeResult Res(ParseTypeName(&Range));
1777    if (!Res.isInvalid()) {
1778      Exceptions.push_back(Res.get());
1779      Ranges.push_back(Range);
1780    }
1781    if (Tok.is(tok::comma))
1782      ConsumeToken();
1783    else
1784      break;
1785  }
1786
1787  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1788  return false;
1789}
1790
1791/// \brief We have just started parsing the definition of a new class,
1792/// so push that class onto our stack of classes that is currently
1793/// being parsed.
1794void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) {
1795  assert((NonNestedClass || !ClassStack.empty()) &&
1796         "Nested class without outer class");
1797  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
1798}
1799
1800/// \brief Deallocate the given parsed class and all of its nested
1801/// classes.
1802void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1803  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1804    DeallocateParsedClasses(Class->NestedClasses[I]);
1805  delete Class;
1806}
1807
1808/// \brief Pop the top class of the stack of classes that are
1809/// currently being parsed.
1810///
1811/// This routine should be called when we have finished parsing the
1812/// definition of a class, but have not yet popped the Scope
1813/// associated with the class's definition.
1814///
1815/// \returns true if the class we've popped is a top-level class,
1816/// false otherwise.
1817void Parser::PopParsingClass() {
1818  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1819
1820  ParsingClass *Victim = ClassStack.top();
1821  ClassStack.pop();
1822  if (Victim->TopLevelClass) {
1823    // Deallocate all of the nested classes of this class,
1824    // recursively: we don't need to keep any of this information.
1825    DeallocateParsedClasses(Victim);
1826    return;
1827  }
1828  assert(!ClassStack.empty() && "Missing top-level class?");
1829
1830  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1831      Victim->NestedClasses.empty()) {
1832    // The victim is a nested class, but we will not need to perform
1833    // any processing after the definition of this class since it has
1834    // no members whose handling was delayed. Therefore, we can just
1835    // remove this nested class.
1836    delete Victim;
1837    return;
1838  }
1839
1840  // This nested class has some members that will need to be processed
1841  // after the top-level class is completely defined. Therefore, add
1842  // it to the list of nested classes within its parent.
1843  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1844  ClassStack.top()->NestedClasses.push_back(Victim);
1845  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1846}
1847
1848/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
1849/// parses standard attributes.
1850///
1851/// [C++0x] attribute-specifier:
1852///         '[' '[' attribute-list ']' ']'
1853///
1854/// [C++0x] attribute-list:
1855///         attribute[opt]
1856///         attribute-list ',' attribute[opt]
1857///
1858/// [C++0x] attribute:
1859///         attribute-token attribute-argument-clause[opt]
1860///
1861/// [C++0x] attribute-token:
1862///         identifier
1863///         attribute-scoped-token
1864///
1865/// [C++0x] attribute-scoped-token:
1866///         attribute-namespace '::' identifier
1867///
1868/// [C++0x] attribute-namespace:
1869///         identifier
1870///
1871/// [C++0x] attribute-argument-clause:
1872///         '(' balanced-token-seq ')'
1873///
1874/// [C++0x] balanced-token-seq:
1875///         balanced-token
1876///         balanced-token-seq balanced-token
1877///
1878/// [C++0x] balanced-token:
1879///         '(' balanced-token-seq ')'
1880///         '[' balanced-token-seq ']'
1881///         '{' balanced-token-seq '}'
1882///         any token but '(', ')', '[', ']', '{', or '}'
1883CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
1884  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
1885      && "Not a C++0x attribute list");
1886
1887  SourceLocation StartLoc = Tok.getLocation(), Loc;
1888  AttributeList *CurrAttr = 0;
1889
1890  ConsumeBracket();
1891  ConsumeBracket();
1892
1893  if (Tok.is(tok::comma)) {
1894    Diag(Tok.getLocation(), diag::err_expected_ident);
1895    ConsumeToken();
1896  }
1897
1898  while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
1899    // attribute not present
1900    if (Tok.is(tok::comma)) {
1901      ConsumeToken();
1902      continue;
1903    }
1904
1905    IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
1906    SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
1907
1908    // scoped attribute
1909    if (Tok.is(tok::coloncolon)) {
1910      ConsumeToken();
1911
1912      if (!Tok.is(tok::identifier)) {
1913        Diag(Tok.getLocation(), diag::err_expected_ident);
1914        SkipUntil(tok::r_square, tok::comma, true, true);
1915        continue;
1916      }
1917
1918      ScopeName = AttrName;
1919      ScopeLoc = AttrLoc;
1920
1921      AttrName = Tok.getIdentifierInfo();
1922      AttrLoc = ConsumeToken();
1923    }
1924
1925    bool AttrParsed = false;
1926    // No scoped names are supported; ideally we could put all non-standard
1927    // attributes into namespaces.
1928    if (!ScopeName) {
1929      switch(AttributeList::getKind(AttrName))
1930      {
1931      // No arguments
1932      case AttributeList::AT_base_check:
1933      case AttributeList::AT_carries_dependency:
1934      case AttributeList::AT_final:
1935      case AttributeList::AT_hiding:
1936      case AttributeList::AT_noreturn:
1937      case AttributeList::AT_override: {
1938        if (Tok.is(tok::l_paren)) {
1939          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
1940            << AttrName->getName();
1941          break;
1942        }
1943
1944        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
1945                                     SourceLocation(), 0, 0, CurrAttr, false,
1946                                     true);
1947        AttrParsed = true;
1948        break;
1949      }
1950
1951      // One argument; must be a type-id or assignment-expression
1952      case AttributeList::AT_aligned: {
1953        if (Tok.isNot(tok::l_paren)) {
1954          Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
1955            << AttrName->getName();
1956          break;
1957        }
1958        SourceLocation ParamLoc = ConsumeParen();
1959
1960        OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
1961
1962        MatchRHSPunctuation(tok::r_paren, ParamLoc);
1963
1964        ExprVector ArgExprs(Actions);
1965        ArgExprs.push_back(ArgExpr.release());
1966        CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
1967                                     0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
1968                                     false, true);
1969
1970        AttrParsed = true;
1971        break;
1972      }
1973
1974      // Silence warnings
1975      default: break;
1976      }
1977    }
1978
1979    // Skip the entire parameter clause, if any
1980    if (!AttrParsed && Tok.is(tok::l_paren)) {
1981      ConsumeParen();
1982      // SkipUntil maintains the balancedness of tokens.
1983      SkipUntil(tok::r_paren, false);
1984    }
1985  }
1986
1987  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1988    SkipUntil(tok::r_square, false);
1989  Loc = Tok.getLocation();
1990  if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
1991    SkipUntil(tok::r_square, false);
1992
1993  CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
1994  return Attr;
1995}
1996
1997/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
1998/// attribute.
1999///
2000/// FIXME: Simply returns an alignof() expression if the argument is a
2001/// type. Ideally, the type should be propagated directly into Sema.
2002///
2003/// [C++0x] 'align' '(' type-id ')'
2004/// [C++0x] 'align' '(' assignment-expression ')'
2005Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2006  if (isTypeIdInParens()) {
2007    EnterExpressionEvaluationContext Unevaluated(Actions,
2008                                                  Action::Unevaluated);
2009    SourceLocation TypeLoc = Tok.getLocation();
2010    TypeTy *Ty = ParseTypeName().get();
2011    SourceRange TypeRange(Start, Tok.getLocation());
2012    return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty,
2013                                              TypeRange);
2014  } else
2015    return ParseConstantExpression();
2016}
2017