ParseDeclCXX.cpp revision dd4a3b0065b9a7e7b00073df415a798886c090f3 
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 "ExtensionRAIIObject.h"
20using namespace clang;
21
22/// ParseNamespace - We know that the current token is a namespace keyword. This
23/// may either be a top level namespace or a block-level namespace alias.
24///
25///       namespace-definition: [C++ 7.3: basic.namespace]
26///         named-namespace-definition
27///         unnamed-namespace-definition
28///
29///       unnamed-namespace-definition:
30///         'namespace' attributes[opt] '{' namespace-body '}'
31///
32///       named-namespace-definition:
33///         original-namespace-definition
34///         extension-namespace-definition
35///
36///       original-namespace-definition:
37///         'namespace' identifier attributes[opt] '{' namespace-body '}'
38///
39///       extension-namespace-definition:
40///         'namespace' original-namespace-name '{' namespace-body '}'
41///
42///       namespace-alias-definition:  [C++ 7.3.2: namespace.alias]
43///         'namespace' identifier '=' qualified-namespace-specifier ';'
44///
45Parser::DeclPtrTy Parser::ParseNamespace(unsigned Context,
46                                         SourceLocation &DeclEnd) {
47  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
48  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
49
50  SourceLocation IdentLoc;
51  IdentifierInfo *Ident = 0;
52
53  Token attrTok;
54
55  if (Tok.is(tok::identifier)) {
56    Ident = Tok.getIdentifierInfo();
57    IdentLoc = ConsumeToken();  // eat the identifier.
58  }
59
60  // Read label attributes, if present.
61  Action::AttrTy *AttrList = 0;
62  if (Tok.is(tok::kw___attribute)) {
63    attrTok = Tok;
64
65    // FIXME: save these somewhere.
66    AttrList = ParseAttributes();
67  }
68
69  if (Tok.is(tok::equal)) {
70    if (AttrList)
71      Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
72
73    return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
74  }
75
76  if (Tok.isNot(tok::l_brace)) {
77    Diag(Tok, Ident ? diag::err_expected_lbrace :
78         diag::err_expected_ident_lbrace);
79    return DeclPtrTy();
80  }
81
82  SourceLocation LBrace = ConsumeBrace();
83
84  // Enter a scope for the namespace.
85  ParseScope NamespaceScope(this, Scope::DeclScope);
86
87  DeclPtrTy NamespcDecl =
88    Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace);
89
90  PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
91                                        PP.getSourceManager(),
92                                        "parsing namespace");
93
94  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof))
95    ParseExternalDeclaration();
96
97  // Leave the namespace scope.
98  NamespaceScope.Exit();
99
100  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
101  Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
102
103  DeclEnd = RBraceLoc;
104  return NamespcDecl;
105}
106
107/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
108/// alias definition.
109///
110Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
111                                              SourceLocation AliasLoc,
112                                              IdentifierInfo *Alias,
113                                              SourceLocation &DeclEnd) {
114  assert(Tok.is(tok::equal) && "Not equal token");
115
116  ConsumeToken(); // eat the '='.
117
118  CXXScopeSpec SS;
119  // Parse (optional) nested-name-specifier.
120  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
121
122  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
123    Diag(Tok, diag::err_expected_namespace_name);
124    // Skip to end of the definition and eat the ';'.
125    SkipUntil(tok::semi);
126    return DeclPtrTy();
127  }
128
129  // Parse identifier.
130  IdentifierInfo *Ident = Tok.getIdentifierInfo();
131  SourceLocation IdentLoc = ConsumeToken();
132
133  // Eat the ';'.
134  DeclEnd = Tok.getLocation();
135  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
136                   "", tok::semi);
137
138  return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias,
139                                        SS, IdentLoc, Ident);
140}
141
142/// ParseLinkage - We know that the current token is a string_literal
143/// and just before that, that extern was seen.
144///
145///       linkage-specification: [C++ 7.5p2: dcl.link]
146///         'extern' string-literal '{' declaration-seq[opt] '}'
147///         'extern' string-literal declaration
148///
149Parser::DeclPtrTy Parser::ParseLinkage(unsigned Context) {
150  assert(Tok.is(tok::string_literal) && "Not a string literal!");
151  llvm::SmallVector<char, 8> LangBuffer;
152  // LangBuffer is guaranteed to be big enough.
153  LangBuffer.resize(Tok.getLength());
154  const char *LangBufPtr = &LangBuffer[0];
155  unsigned StrSize = PP.getSpelling(Tok, LangBufPtr);
156
157  SourceLocation Loc = ConsumeStringToken();
158
159  ParseScope LinkageScope(this, Scope::DeclScope);
160  DeclPtrTy LinkageSpec
161    = Actions.ActOnStartLinkageSpecification(CurScope,
162                                             /*FIXME: */SourceLocation(),
163                                             Loc, LangBufPtr, StrSize,
164                                       Tok.is(tok::l_brace)? Tok.getLocation()
165                                                           : SourceLocation());
166
167  if (Tok.isNot(tok::l_brace)) {
168    ParseDeclarationOrFunctionDefinition();
169    return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
170                                                   SourceLocation());
171  }
172
173  SourceLocation LBrace = ConsumeBrace();
174  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
175    ParseExternalDeclaration();
176  }
177
178  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
179  return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
180}
181
182/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
183/// using-directive. Assumes that current token is 'using'.
184Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
185                                                     SourceLocation &DeclEnd) {
186  assert(Tok.is(tok::kw_using) && "Not using token");
187
188  // Eat 'using'.
189  SourceLocation UsingLoc = ConsumeToken();
190
191  if (Tok.is(tok::kw_namespace))
192    // Next token after 'using' is 'namespace' so it must be using-directive
193    return ParseUsingDirective(Context, UsingLoc, DeclEnd);
194
195  // Otherwise, it must be using-declaration.
196  return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
197}
198
199/// ParseUsingDirective - Parse C++ using-directive, assumes
200/// that current token is 'namespace' and 'using' was already parsed.
201///
202///       using-directive: [C++ 7.3.p4: namespace.udir]
203///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
204///                 namespace-name ;
205/// [GNU] using-directive:
206///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
207///                 namespace-name attributes[opt] ;
208///
209Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
210                                              SourceLocation UsingLoc,
211                                              SourceLocation &DeclEnd) {
212  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
213
214  // Eat 'namespace'.
215  SourceLocation NamespcLoc = ConsumeToken();
216
217  CXXScopeSpec SS;
218  // Parse (optional) nested-name-specifier.
219  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
220
221  AttributeList *AttrList = 0;
222  IdentifierInfo *NamespcName = 0;
223  SourceLocation IdentLoc = SourceLocation();
224
225  // Parse namespace-name.
226  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
227    Diag(Tok, diag::err_expected_namespace_name);
228    // If there was invalid namespace name, skip to end of decl, and eat ';'.
229    SkipUntil(tok::semi);
230    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
231    return DeclPtrTy();
232  }
233
234  // Parse identifier.
235  NamespcName = Tok.getIdentifierInfo();
236  IdentLoc = ConsumeToken();
237
238  // Parse (optional) attributes (most likely GNU strong-using extension).
239  if (Tok.is(tok::kw___attribute))
240    AttrList = ParseAttributes();
241
242  // Eat ';'.
243  DeclEnd = Tok.getLocation();
244  ExpectAndConsume(tok::semi,
245                   AttrList ? diag::err_expected_semi_after_attribute_list :
246                   diag::err_expected_semi_after_namespace_name, "", tok::semi);
247
248  return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
249                                      IdentLoc, NamespcName, AttrList);
250}
251
252/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
253/// 'using' was already seen.
254///
255///     using-declaration: [C++ 7.3.p3: namespace.udecl]
256///       'using' 'typename'[opt] ::[opt] nested-name-specifier
257///               unqualified-id
258///       'using' :: unqualified-id
259///
260Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
261                                                SourceLocation UsingLoc,
262                                                SourceLocation &DeclEnd,
263                                                AccessSpecifier AS) {
264  CXXScopeSpec SS;
265  bool IsTypeName;
266
267  // Ignore optional 'typename'.
268  if (Tok.is(tok::kw_typename)) {
269    ConsumeToken();
270    IsTypeName = true;
271  }
272  else
273    IsTypeName = false;
274
275  // Parse nested-name-specifier.
276  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
277
278  AttributeList *AttrList = 0;
279
280  // Check nested-name specifier.
281  if (SS.isInvalid()) {
282    SkipUntil(tok::semi);
283    return DeclPtrTy();
284  }
285  if (Tok.is(tok::annot_template_id)) {
286    // C++0x N2914 [namespace.udecl]p5:
287    // A using-declaration shall not name a template-id.
288    Diag(Tok, diag::err_using_decl_can_not_refer_to_template_spec);
289    SkipUntil(tok::semi);
290    return DeclPtrTy();
291  }
292
293  IdentifierInfo *TargetName = 0;
294  OverloadedOperatorKind Op = OO_None;
295  SourceLocation IdentLoc;
296
297  if (Tok.is(tok::kw_operator)) {
298    IdentLoc = Tok.getLocation();
299
300    Op = TryParseOperatorFunctionId();
301    if (!Op) {
302      // If there was an invalid operator, skip to end of decl, and eat ';'.
303      SkipUntil(tok::semi);
304      return DeclPtrTy();
305    }
306  } else if (Tok.is(tok::identifier)) {
307    // Parse identifier.
308    TargetName = Tok.getIdentifierInfo();
309    IdentLoc = ConsumeToken();
310  } else {
311    // FIXME: Use a better diagnostic here.
312    Diag(Tok, diag::err_expected_ident_in_using);
313
314    // If there was invalid identifier, skip to end of decl, and eat ';'.
315    SkipUntil(tok::semi);
316    return DeclPtrTy();
317  }
318
319  // Parse (optional) attributes (most likely GNU strong-using extension).
320  if (Tok.is(tok::kw___attribute))
321    AttrList = ParseAttributes();
322
323  // Eat ';'.
324  DeclEnd = Tok.getLocation();
325  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
326                   AttrList ? "attributes list" : "namespace name", tok::semi);
327
328  return Actions.ActOnUsingDeclaration(CurScope, AS, UsingLoc, SS,
329                                       IdentLoc, TargetName, Op,
330                                       AttrList, IsTypeName);
331}
332
333/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
334///
335///      static_assert-declaration:
336///        static_assert ( constant-expression  ,  string-literal  ) ;
337///
338Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
339  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
340  SourceLocation StaticAssertLoc = ConsumeToken();
341
342  if (Tok.isNot(tok::l_paren)) {
343    Diag(Tok, diag::err_expected_lparen);
344    return DeclPtrTy();
345  }
346
347  SourceLocation LParenLoc = ConsumeParen();
348
349  OwningExprResult AssertExpr(ParseConstantExpression());
350  if (AssertExpr.isInvalid()) {
351    SkipUntil(tok::semi);
352    return DeclPtrTy();
353  }
354
355  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
356    return DeclPtrTy();
357
358  if (Tok.isNot(tok::string_literal)) {
359    Diag(Tok, diag::err_expected_string_literal);
360    SkipUntil(tok::semi);
361    return DeclPtrTy();
362  }
363
364  OwningExprResult AssertMessage(ParseStringLiteralExpression());
365  if (AssertMessage.isInvalid())
366    return DeclPtrTy();
367
368  MatchRHSPunctuation(tok::r_paren, LParenLoc);
369
370  DeclEnd = Tok.getLocation();
371  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
372
373  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
374                                              move(AssertMessage));
375}
376
377/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
378///
379/// 'decltype' ( expression )
380///
381void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
382  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
383
384  SourceLocation StartLoc = ConsumeToken();
385  SourceLocation LParenLoc = Tok.getLocation();
386
387  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
388                       "decltype")) {
389    SkipUntil(tok::r_paren);
390    return;
391  }
392
393  // Parse the expression
394
395  // C++0x [dcl.type.simple]p4:
396  //   The operand of the decltype specifier is an unevaluated operand.
397  EnterExpressionEvaluationContext Unevaluated(Actions,
398                                               Action::Unevaluated);
399  OwningExprResult Result = ParseExpression();
400  if (Result.isInvalid()) {
401    SkipUntil(tok::r_paren);
402    return;
403  }
404
405  // Match the ')'
406  SourceLocation RParenLoc;
407  if (Tok.is(tok::r_paren))
408    RParenLoc = ConsumeParen();
409  else
410    MatchRHSPunctuation(tok::r_paren, LParenLoc);
411
412  if (RParenLoc.isInvalid())
413    return;
414
415  const char *PrevSpec = 0;
416  unsigned DiagID;
417  // Check for duplicate type specifiers (e.g. "int decltype(a)").
418  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
419                         DiagID, Result.release()))
420    Diag(StartLoc, DiagID) << PrevSpec;
421}
422
423/// ParseClassName - Parse a C++ class-name, which names a class. Note
424/// that we only check that the result names a type; semantic analysis
425/// will need to verify that the type names a class. The result is
426/// either a type or NULL, depending on whether a type name was
427/// found.
428///
429///       class-name: [C++ 9.1]
430///         identifier
431///         simple-template-id
432///
433Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
434                                          const CXXScopeSpec *SS,
435                                          bool DestrExpected) {
436  // Check whether we have a template-id that names a type.
437  if (Tok.is(tok::annot_template_id)) {
438    TemplateIdAnnotation *TemplateId
439      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
440    if (TemplateId->Kind == TNK_Type_template) {
441      AnnotateTemplateIdTokenAsType(SS);
442
443      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
444      TypeTy *Type = Tok.getAnnotationValue();
445      EndLocation = Tok.getAnnotationEndLoc();
446      ConsumeToken();
447
448      if (Type)
449        return Type;
450      return true;
451    }
452
453    // Fall through to produce an error below.
454  }
455
456  if (Tok.isNot(tok::identifier)) {
457    Diag(Tok, diag::err_expected_class_name);
458    return true;
459  }
460
461  // We have an identifier; check whether it is actually a type.
462  TypeTy *Type = Actions.getTypeName(*Tok.getIdentifierInfo(),
463                                     Tok.getLocation(), CurScope, SS,
464                                     true);
465  if (!Type) {
466    Diag(Tok, DestrExpected ? diag::err_destructor_class_name
467                            : diag::err_expected_class_name);
468    return true;
469  }
470
471  // Consume the identifier.
472  EndLocation = ConsumeToken();
473  return Type;
474}
475
476/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
477/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
478/// until we reach the start of a definition or see a token that
479/// cannot start a definition.
480///
481///       class-specifier: [C++ class]
482///         class-head '{' member-specification[opt] '}'
483///         class-head '{' member-specification[opt] '}' attributes[opt]
484///       class-head:
485///         class-key identifier[opt] base-clause[opt]
486///         class-key nested-name-specifier identifier base-clause[opt]
487///         class-key nested-name-specifier[opt] simple-template-id
488///                          base-clause[opt]
489/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
490/// [GNU]   class-key attributes[opt] nested-name-specifier
491///                          identifier base-clause[opt]
492/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
493///                          simple-template-id base-clause[opt]
494///       class-key:
495///         'class'
496///         'struct'
497///         'union'
498///
499///       elaborated-type-specifier: [C++ dcl.type.elab]
500///         class-key ::[opt] nested-name-specifier[opt] identifier
501///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
502///                          simple-template-id
503///
504///  Note that the C++ class-specifier and elaborated-type-specifier,
505///  together, subsume the C99 struct-or-union-specifier:
506///
507///       struct-or-union-specifier: [C99 6.7.2.1]
508///         struct-or-union identifier[opt] '{' struct-contents '}'
509///         struct-or-union identifier
510/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
511///                                                         '}' attributes[opt]
512/// [GNU]   struct-or-union attributes[opt] identifier
513///       struct-or-union:
514///         'struct'
515///         'union'
516void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
517                                 SourceLocation StartLoc, DeclSpec &DS,
518                                 const ParsedTemplateInfo &TemplateInfo,
519                                 AccessSpecifier AS) {
520  DeclSpec::TST TagType;
521  if (TagTokKind == tok::kw_struct)
522    TagType = DeclSpec::TST_struct;
523  else if (TagTokKind == tok::kw_class)
524    TagType = DeclSpec::TST_class;
525  else {
526    assert(TagTokKind == tok::kw_union && "Not a class specifier");
527    TagType = DeclSpec::TST_union;
528  }
529
530  AttributeList *Attr = 0;
531  // If attributes exist after tag, parse them.
532  if (Tok.is(tok::kw___attribute))
533    Attr = ParseAttributes();
534
535  // If declspecs exist after tag, parse them.
536  if (Tok.is(tok::kw___declspec))
537    Attr = ParseMicrosoftDeclSpec(Attr);
538
539  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
540    // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
541    // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
542    // token sequence "struct __is_pod", make __is_pod into a normal
543    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
544    // properly.
545    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
546    Tok.setKind(tok::identifier);
547  }
548
549  if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
550    // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
551    // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
552    // token sequence "struct __is_empty", make __is_empty into a normal
553    // identifier rather than a keyword, to allow libstdc++ 4.2 to work
554    // properly.
555    Tok.getIdentifierInfo()->setTokenID(tok::identifier);
556    Tok.setKind(tok::identifier);
557  }
558
559  // Parse the (optional) nested-name-specifier.
560  CXXScopeSpec SS;
561  if (getLang().CPlusPlus &&
562      ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true))
563    if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
564      Diag(Tok, diag::err_expected_ident);
565
566  // Parse the (optional) class name or simple-template-id.
567  IdentifierInfo *Name = 0;
568  SourceLocation NameLoc;
569  TemplateIdAnnotation *TemplateId = 0;
570  if (Tok.is(tok::identifier)) {
571    Name = Tok.getIdentifierInfo();
572    NameLoc = ConsumeToken();
573  } else if (Tok.is(tok::annot_template_id)) {
574    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
575    NameLoc = ConsumeToken();
576
577    if (TemplateId->Kind != TNK_Type_template) {
578      // The template-name in the simple-template-id refers to
579      // something other than a class template. Give an appropriate
580      // error message and skip to the ';'.
581      SourceRange Range(NameLoc);
582      if (SS.isNotEmpty())
583        Range.setBegin(SS.getBeginLoc());
584
585      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
586        << Name << static_cast<int>(TemplateId->Kind) << Range;
587
588      DS.SetTypeSpecError();
589      SkipUntil(tok::semi, false, true);
590      TemplateId->Destroy();
591      return;
592    }
593  }
594
595  // There are four options here.  If we have 'struct foo;', then this
596  // is either a forward declaration or a friend declaration, which
597  // have to be treated differently.  If we have 'struct foo {...' or
598  // 'struct foo :...' then this is a definition. Otherwise we have
599  // something like 'struct foo xyz', a reference.
600  Action::TagUseKind TUK;
601  if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon)))
602    TUK = Action::TUK_Definition;
603  else if (Tok.is(tok::semi))
604    TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
605  else
606    TUK = Action::TUK_Reference;
607
608  if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
609    // We have a declaration or reference to an anonymous class.
610    Diag(StartLoc, diag::err_anon_type_definition)
611      << DeclSpec::getSpecifierName(TagType);
612
613    // Skip the rest of this declarator, up until the comma or semicolon.
614    SkipUntil(tok::comma, true);
615
616    if (TemplateId)
617      TemplateId->Destroy();
618    return;
619  }
620
621  // Create the tag portion of the class or class template.
622  Action::DeclResult TagOrTempResult = true; // invalid
623  Action::TypeResult TypeResult = true; // invalid
624  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
625
626  // FIXME: When TUK == TUK_Reference and we have a template-id, we need
627  // to turn that template-id into a type.
628
629  bool Owned = false;
630  if (TemplateId) {
631    // Explicit specialization, class template partial specialization,
632    // or explicit instantiation.
633    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
634                                       TemplateId->getTemplateArgs(),
635                                       TemplateId->getTemplateArgIsType(),
636                                       TemplateId->NumArgs);
637    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
638        TUK == Action::TUK_Declaration) {
639      // This is an explicit instantiation of a class template.
640      TagOrTempResult
641        = Actions.ActOnExplicitInstantiation(CurScope,
642                                             TemplateInfo.ExternLoc,
643                                             TemplateInfo.TemplateLoc,
644                                             TagType,
645                                             StartLoc,
646                                             SS,
647                                     TemplateTy::make(TemplateId->Template),
648                                             TemplateId->TemplateNameLoc,
649                                             TemplateId->LAngleLoc,
650                                             TemplateArgsPtr,
651                                      TemplateId->getTemplateArgLocations(),
652                                             TemplateId->RAngleLoc,
653                                             Attr);
654    } else if (TUK == Action::TUK_Reference || TUK == Action::TUK_Friend) {
655      TypeResult
656        = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
657                                      TemplateId->TemplateNameLoc,
658                                      TemplateId->LAngleLoc,
659                                      TemplateArgsPtr,
660                                      TemplateId->getTemplateArgLocations(),
661                                      TemplateId->RAngleLoc);
662
663      TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
664                                                  TagType, StartLoc);
665    } else {
666      // This is an explicit specialization or a class template
667      // partial specialization.
668      TemplateParameterLists FakedParamLists;
669
670      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
671        // This looks like an explicit instantiation, because we have
672        // something like
673        //
674        //   template class Foo<X>
675        //
676        // but it actually has a definition. Most likely, this was
677        // meant to be an explicit specialization, but the user forgot
678        // the '<>' after 'template'.
679        assert(TUK == Action::TUK_Definition && "Expected a definition here");
680
681        SourceLocation LAngleLoc
682          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
683        Diag(TemplateId->TemplateNameLoc,
684             diag::err_explicit_instantiation_with_definition)
685          << SourceRange(TemplateInfo.TemplateLoc)
686          << CodeModificationHint::CreateInsertion(LAngleLoc, "<>");
687
688        // Create a fake template parameter list that contains only
689        // "template<>", so that we treat this construct as a class
690        // template specialization.
691        FakedParamLists.push_back(
692          Actions.ActOnTemplateParameterList(0, SourceLocation(),
693                                             TemplateInfo.TemplateLoc,
694                                             LAngleLoc,
695                                             0, 0,
696                                             LAngleLoc));
697        TemplateParams = &FakedParamLists;
698      }
699
700      // Build the class template specialization.
701      TagOrTempResult
702        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
703                       StartLoc, SS,
704                       TemplateTy::make(TemplateId->Template),
705                       TemplateId->TemplateNameLoc,
706                       TemplateId->LAngleLoc,
707                       TemplateArgsPtr,
708                       TemplateId->getTemplateArgLocations(),
709                       TemplateId->RAngleLoc,
710                       Attr,
711                       Action::MultiTemplateParamsArg(Actions,
712                                    TemplateParams? &(*TemplateParams)[0] : 0,
713                                 TemplateParams? TemplateParams->size() : 0));
714    }
715    TemplateId->Destroy();
716  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
717             TUK == Action::TUK_Declaration) {
718    // Explicit instantiation of a member of a class template
719    // specialization, e.g.,
720    //
721    //   template struct Outer<int>::Inner;
722    //
723    TagOrTempResult
724      = Actions.ActOnExplicitInstantiation(CurScope,
725                                           TemplateInfo.ExternLoc,
726                                           TemplateInfo.TemplateLoc,
727                                           TagType, StartLoc, SS, Name,
728                                           NameLoc, Attr);
729  } else {
730    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
731        TUK == Action::TUK_Definition) {
732      // FIXME: Diagnose this particular error.
733    }
734
735    bool IsDependent = false;
736
737    // Declaration or definition of a class type
738    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
739                                       Name, NameLoc, Attr, AS,
740                                  Action::MultiTemplateParamsArg(Actions,
741                                    TemplateParams? &(*TemplateParams)[0] : 0,
742                                    TemplateParams? TemplateParams->size() : 0),
743                                       Owned, IsDependent);
744
745    // If ActOnTag said the type was dependent, try again with the
746    // less common call.
747    if (IsDependent)
748      TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
749                                             SS, Name, StartLoc, NameLoc);
750  }
751
752  // Parse the optional base clause (C++ only).
753  if (getLang().CPlusPlus && Tok.is(tok::colon))
754    ParseBaseClause(TagOrTempResult.get());
755
756  // If there is a body, parse it and inform the actions module.
757  if (Tok.is(tok::l_brace))
758    if (getLang().CPlusPlus)
759      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
760    else
761      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
762  else if (TUK == Action::TUK_Definition) {
763    // FIXME: Complain that we have a base-specifier list but no
764    // definition.
765    Diag(Tok, diag::err_expected_lbrace);
766  }
767
768  void *Result;
769  if (!TypeResult.isInvalid()) {
770    TagType = DeclSpec::TST_typename;
771    Result = TypeResult.get();
772    Owned = false;
773  } else if (!TagOrTempResult.isInvalid()) {
774    Result = TagOrTempResult.get().getAs<void>();
775  } else {
776    DS.SetTypeSpecError();
777    return;
778  }
779
780  const char *PrevSpec = 0;
781  unsigned DiagID;
782
783  if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, DiagID,
784                         Result, Owned))
785    Diag(StartLoc, DiagID) << PrevSpec;
786}
787
788/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
789///
790///       base-clause : [C++ class.derived]
791///         ':' base-specifier-list
792///       base-specifier-list:
793///         base-specifier '...'[opt]
794///         base-specifier-list ',' base-specifier '...'[opt]
795void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
796  assert(Tok.is(tok::colon) && "Not a base clause");
797  ConsumeToken();
798
799  // Build up an array of parsed base specifiers.
800  llvm::SmallVector<BaseTy *, 8> BaseInfo;
801
802  while (true) {
803    // Parse a base-specifier.
804    BaseResult Result = ParseBaseSpecifier(ClassDecl);
805    if (Result.isInvalid()) {
806      // Skip the rest of this base specifier, up until the comma or
807      // opening brace.
808      SkipUntil(tok::comma, tok::l_brace, true, true);
809    } else {
810      // Add this to our array of base specifiers.
811      BaseInfo.push_back(Result.get());
812    }
813
814    // If the next token is a comma, consume it and keep reading
815    // base-specifiers.
816    if (Tok.isNot(tok::comma)) break;
817
818    // Consume the comma.
819    ConsumeToken();
820  }
821
822  // Attach the base specifiers
823  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
824}
825
826/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
827/// one entry in the base class list of a class specifier, for example:
828///    class foo : public bar, virtual private baz {
829/// 'public bar' and 'virtual private baz' are each base-specifiers.
830///
831///       base-specifier: [C++ class.derived]
832///         ::[opt] nested-name-specifier[opt] class-name
833///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
834///                        class-name
835///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
836///                        class-name
837Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
838  bool IsVirtual = false;
839  SourceLocation StartLoc = Tok.getLocation();
840
841  // Parse the 'virtual' keyword.
842  if (Tok.is(tok::kw_virtual))  {
843    ConsumeToken();
844    IsVirtual = true;
845  }
846
847  // Parse an (optional) access specifier.
848  AccessSpecifier Access = getAccessSpecifierIfPresent();
849  if (Access)
850    ConsumeToken();
851
852  // Parse the 'virtual' keyword (again!), in case it came after the
853  // access specifier.
854  if (Tok.is(tok::kw_virtual))  {
855    SourceLocation VirtualLoc = ConsumeToken();
856    if (IsVirtual) {
857      // Complain about duplicate 'virtual'
858      Diag(VirtualLoc, diag::err_dup_virtual)
859        << CodeModificationHint::CreateRemoval(SourceRange(VirtualLoc));
860    }
861
862    IsVirtual = true;
863  }
864
865  // Parse optional '::' and optional nested-name-specifier.
866  CXXScopeSpec SS;
867  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true);
868
869  // The location of the base class itself.
870  SourceLocation BaseLoc = Tok.getLocation();
871
872  // Parse the class-name.
873  SourceLocation EndLocation;
874  TypeResult BaseType = ParseClassName(EndLocation, &SS);
875  if (BaseType.isInvalid())
876    return true;
877
878  // Find the complete source range for the base-specifier.
879  SourceRange Range(StartLoc, EndLocation);
880
881  // Notify semantic analysis that we have parsed a complete
882  // base-specifier.
883  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
884                                    BaseType.get(), BaseLoc);
885}
886
887/// getAccessSpecifierIfPresent - Determine whether the next token is
888/// a C++ access-specifier.
889///
890///       access-specifier: [C++ class.derived]
891///         'private'
892///         'protected'
893///         'public'
894AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
895  switch (Tok.getKind()) {
896  default: return AS_none;
897  case tok::kw_private: return AS_private;
898  case tok::kw_protected: return AS_protected;
899  case tok::kw_public: return AS_public;
900  }
901}
902
903void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
904                                             DeclPtrTy ThisDecl) {
905  // We just declared a member function. If this member function
906  // has any default arguments, we'll need to parse them later.
907  LateParsedMethodDeclaration *LateMethod = 0;
908  DeclaratorChunk::FunctionTypeInfo &FTI
909    = DeclaratorInfo.getTypeObject(0).Fun;
910  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
911    if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
912      if (!LateMethod) {
913        // Push this method onto the stack of late-parsed method
914        // declarations.
915        getCurrentClass().MethodDecls.push_back(
916                                LateParsedMethodDeclaration(ThisDecl));
917        LateMethod = &getCurrentClass().MethodDecls.back();
918        LateMethod->TemplateScope = CurScope->isTemplateParamScope();
919
920        // Add all of the parameters prior to this one (they don't
921        // have default arguments).
922        LateMethod->DefaultArgs.reserve(FTI.NumArgs);
923        for (unsigned I = 0; I < ParamIdx; ++I)
924          LateMethod->DefaultArgs.push_back(
925                    LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
926      }
927
928      // Add this parameter to the list of parameters (it or may
929      // not have a default argument).
930      LateMethod->DefaultArgs.push_back(
931        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
932                                  FTI.ArgInfo[ParamIdx].DefaultArgTokens));
933    }
934  }
935}
936
937/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
938///
939///       member-declaration:
940///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
941///         function-definition ';'[opt]
942///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
943///         using-declaration                                            [TODO]
944/// [C++0x] static_assert-declaration
945///         template-declaration
946/// [GNU]   '__extension__' member-declaration
947///
948///       member-declarator-list:
949///         member-declarator
950///         member-declarator-list ',' member-declarator
951///
952///       member-declarator:
953///         declarator pure-specifier[opt]
954///         declarator constant-initializer[opt]
955///         identifier[opt] ':' constant-expression
956///
957///       pure-specifier:
958///         '= 0'
959///
960///       constant-initializer:
961///         '=' constant-expression
962///
963void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
964                                       const ParsedTemplateInfo &TemplateInfo) {
965  // static_assert-declaration
966  if (Tok.is(tok::kw_static_assert)) {
967    // FIXME: Check for templates
968    SourceLocation DeclEnd;
969    ParseStaticAssertDeclaration(DeclEnd);
970    return;
971  }
972
973  if (Tok.is(tok::kw_template)) {
974    assert(!TemplateInfo.TemplateParams &&
975           "Nested template improperly parsed?");
976    SourceLocation DeclEnd;
977    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
978                                         AS);
979    return;
980  }
981
982  // Handle:  member-declaration ::= '__extension__' member-declaration
983  if (Tok.is(tok::kw___extension__)) {
984    // __extension__ silences extension warnings in the subexpression.
985    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
986    ConsumeToken();
987    return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
988  }
989
990  if (Tok.is(tok::kw_using)) {
991    // FIXME: Check for template aliases
992
993    // Eat 'using'.
994    SourceLocation UsingLoc = ConsumeToken();
995
996    if (Tok.is(tok::kw_namespace)) {
997      Diag(UsingLoc, diag::err_using_namespace_in_class);
998      SkipUntil(tok::semi, true, true);
999    }
1000    else {
1001      SourceLocation DeclEnd;
1002      // Otherwise, it must be using-declaration.
1003      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
1004    }
1005    return;
1006  }
1007
1008  SourceLocation DSStart = Tok.getLocation();
1009  // decl-specifier-seq:
1010  // Parse the common declaration-specifiers piece.
1011  DeclSpec DS;
1012  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1013
1014  Action::MultiTemplateParamsArg TemplateParams(Actions,
1015      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1016      TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1017
1018  if (Tok.is(tok::semi)) {
1019    ConsumeToken();
1020
1021    if (DS.isFriendSpecified()) {
1022      Actions.ActOnFriendTypeDecl(CurScope, DS, move(TemplateParams));
1023    } else
1024      Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1025
1026    return;
1027  }
1028
1029  Declarator DeclaratorInfo(DS, Declarator::MemberContext);
1030
1031  if (Tok.isNot(tok::colon)) {
1032    // Parse the first declarator.
1033    ParseDeclarator(DeclaratorInfo);
1034    // Error parsing the declarator?
1035    if (!DeclaratorInfo.hasName()) {
1036      // If so, skip until the semi-colon or a }.
1037      SkipUntil(tok::r_brace, true);
1038      if (Tok.is(tok::semi))
1039        ConsumeToken();
1040      return;
1041    }
1042
1043    // function-definition:
1044    if (Tok.is(tok::l_brace)
1045        || (DeclaratorInfo.isFunctionDeclarator() &&
1046            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
1047      if (!DeclaratorInfo.isFunctionDeclarator()) {
1048        Diag(Tok, diag::err_func_def_no_params);
1049        ConsumeBrace();
1050        SkipUntil(tok::r_brace, true);
1051        return;
1052      }
1053
1054      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1055        Diag(Tok, diag::err_function_declared_typedef);
1056        // This recovery skips the entire function body. It would be nice
1057        // to simply call ParseCXXInlineMethodDef() below, however Sema
1058        // assumes the declarator represents a function, not a typedef.
1059        ConsumeBrace();
1060        SkipUntil(tok::r_brace, true);
1061        return;
1062      }
1063
1064      ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
1065      return;
1066    }
1067  }
1068
1069  // member-declarator-list:
1070  //   member-declarator
1071  //   member-declarator-list ',' member-declarator
1072
1073  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
1074  OwningExprResult BitfieldSize(Actions);
1075  OwningExprResult Init(Actions);
1076  bool Deleted = false;
1077
1078  while (1) {
1079
1080    // member-declarator:
1081    //   declarator pure-specifier[opt]
1082    //   declarator constant-initializer[opt]
1083    //   identifier[opt] ':' constant-expression
1084
1085    if (Tok.is(tok::colon)) {
1086      ConsumeToken();
1087      BitfieldSize = ParseConstantExpression();
1088      if (BitfieldSize.isInvalid())
1089        SkipUntil(tok::comma, true, true);
1090    }
1091
1092    // pure-specifier:
1093    //   '= 0'
1094    //
1095    // constant-initializer:
1096    //   '=' constant-expression
1097    //
1098    // defaulted/deleted function-definition:
1099    //   '=' 'default'                          [TODO]
1100    //   '=' 'delete'
1101
1102    if (Tok.is(tok::equal)) {
1103      ConsumeToken();
1104      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1105        ConsumeToken();
1106        Deleted = true;
1107      } else {
1108        Init = ParseInitializer();
1109        if (Init.isInvalid())
1110          SkipUntil(tok::comma, true, true);
1111      }
1112    }
1113
1114    // If attributes exist after the declarator, parse them.
1115    if (Tok.is(tok::kw___attribute)) {
1116      SourceLocation Loc;
1117      AttributeList *AttrList = ParseAttributes(&Loc);
1118      DeclaratorInfo.AddAttributes(AttrList, Loc);
1119    }
1120
1121    // NOTE: If Sema is the Action module and declarator is an instance field,
1122    // this call will *not* return the created decl; It will return null.
1123    // See Sema::ActOnCXXMemberDeclarator for details.
1124
1125    DeclPtrTy ThisDecl;
1126    if (DS.isFriendSpecified()) {
1127      // TODO: handle initializers, bitfields, 'delete'
1128      ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
1129                                                 /*IsDefinition*/ false,
1130                                                 move(TemplateParams));
1131    } else {
1132      ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1133                                                  DeclaratorInfo,
1134                                                  move(TemplateParams),
1135                                                  BitfieldSize.release(),
1136                                                  Init.release(),
1137                                                  Deleted);
1138    }
1139    if (ThisDecl)
1140      DeclsInGroup.push_back(ThisDecl);
1141
1142    if (DeclaratorInfo.isFunctionDeclarator() &&
1143        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1144          != DeclSpec::SCS_typedef) {
1145      HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1146    }
1147
1148    // If we don't have a comma, it is either the end of the list (a ';')
1149    // or an error, bail out.
1150    if (Tok.isNot(tok::comma))
1151      break;
1152
1153    // Consume the comma.
1154    ConsumeToken();
1155
1156    // Parse the next declarator.
1157    DeclaratorInfo.clear();
1158    BitfieldSize = 0;
1159    Init = 0;
1160    Deleted = false;
1161
1162    // Attributes are only allowed on the second declarator.
1163    if (Tok.is(tok::kw___attribute)) {
1164      SourceLocation Loc;
1165      AttributeList *AttrList = ParseAttributes(&Loc);
1166      DeclaratorInfo.AddAttributes(AttrList, Loc);
1167    }
1168
1169    if (Tok.isNot(tok::colon))
1170      ParseDeclarator(DeclaratorInfo);
1171  }
1172
1173  if (Tok.is(tok::semi)) {
1174    ConsumeToken();
1175    Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1176                                    DeclsInGroup.size());
1177    return;
1178  }
1179
1180  Diag(Tok, diag::err_expected_semi_decl_list);
1181  // Skip to end of block or statement
1182  SkipUntil(tok::r_brace, true, true);
1183  if (Tok.is(tok::semi))
1184    ConsumeToken();
1185  return;
1186}
1187
1188/// ParseCXXMemberSpecification - Parse the class definition.
1189///
1190///       member-specification:
1191///         member-declaration member-specification[opt]
1192///         access-specifier ':' member-specification[opt]
1193///
1194void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1195                                         unsigned TagType, DeclPtrTy TagDecl) {
1196  assert((TagType == DeclSpec::TST_struct ||
1197         TagType == DeclSpec::TST_union  ||
1198         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1199
1200  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1201                                        PP.getSourceManager(),
1202                                        "parsing struct/union/class body");
1203
1204  SourceLocation LBraceLoc = ConsumeBrace();
1205
1206  // Determine whether this is a top-level (non-nested) class.
1207  bool TopLevelClass = ClassStack.empty() ||
1208    CurScope->isInCXXInlineMethodScope();
1209
1210  // Enter a scope for the class.
1211  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1212
1213  // Note that we are parsing a new (potentially-nested) class definition.
1214  ParsingClassDefinition ParsingDef(*this, TagDecl, TopLevelClass);
1215
1216  if (TagDecl)
1217    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1218  else {
1219    SkipUntil(tok::r_brace, false, false);
1220    return;
1221  }
1222
1223  // C++ 11p3: Members of a class defined with the keyword class are private
1224  // by default. Members of a class defined with the keywords struct or union
1225  // are public by default.
1226  AccessSpecifier CurAS;
1227  if (TagType == DeclSpec::TST_class)
1228    CurAS = AS_private;
1229  else
1230    CurAS = AS_public;
1231
1232  // While we still have something to read, read the member-declarations.
1233  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1234    // Each iteration of this loop reads one member-declaration.
1235
1236    // Check for extraneous top-level semicolon.
1237    if (Tok.is(tok::semi)) {
1238      Diag(Tok, diag::ext_extra_struct_semi);
1239      ConsumeToken();
1240      continue;
1241    }
1242
1243    AccessSpecifier AS = getAccessSpecifierIfPresent();
1244    if (AS != AS_none) {
1245      // Current token is a C++ access specifier.
1246      CurAS = AS;
1247      ConsumeToken();
1248      ExpectAndConsume(tok::colon, diag::err_expected_colon);
1249      continue;
1250    }
1251
1252    // FIXME: Make sure we don't have a template here.
1253
1254    // Parse all the comma separated declarators.
1255    ParseCXXClassMemberDeclaration(CurAS);
1256  }
1257
1258  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1259
1260  AttributeList *AttrList = 0;
1261  // If attributes exist after class contents, parse them.
1262  if (Tok.is(tok::kw___attribute))
1263    AttrList = ParseAttributes(); // FIXME: where should I put them?
1264
1265  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1266                                            LBraceLoc, RBraceLoc);
1267
1268  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1269  // complete within function bodies, default arguments,
1270  // exception-specifications, and constructor ctor-initializers (including
1271  // such things in nested classes).
1272  //
1273  // FIXME: Only function bodies and constructor ctor-initializers are
1274  // parsed correctly, fix the rest.
1275  if (TopLevelClass) {
1276    // We are not inside a nested class. This class and its nested classes
1277    // are complete and we can parse the delayed portions of method
1278    // declarations and the lexed inline method definitions.
1279    ParseLexedMethodDeclarations(getCurrentClass());
1280    ParseLexedMethodDefs(getCurrentClass());
1281  }
1282
1283  // Leave the class scope.
1284  ParsingDef.Pop();
1285  ClassScope.Exit();
1286
1287  Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1288}
1289
1290/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1291/// which explicitly initializes the members or base classes of a
1292/// class (C++ [class.base.init]). For example, the three initializers
1293/// after the ':' in the Derived constructor below:
1294///
1295/// @code
1296/// class Base { };
1297/// class Derived : Base {
1298///   int x;
1299///   float f;
1300/// public:
1301///   Derived(float f) : Base(), x(17), f(f) { }
1302/// };
1303/// @endcode
1304///
1305/// [C++]  ctor-initializer:
1306///          ':' mem-initializer-list
1307///
1308/// [C++]  mem-initializer-list:
1309///          mem-initializer
1310///          mem-initializer , mem-initializer-list
1311void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1312  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1313
1314  SourceLocation ColonLoc = ConsumeToken();
1315
1316  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1317
1318  do {
1319    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1320    if (!MemInit.isInvalid())
1321      MemInitializers.push_back(MemInit.get());
1322
1323    if (Tok.is(tok::comma))
1324      ConsumeToken();
1325    else if (Tok.is(tok::l_brace))
1326      break;
1327    else {
1328      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1329      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1330      SkipUntil(tok::l_brace, true, true);
1331      break;
1332    }
1333  } while (true);
1334
1335  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1336                               MemInitializers.data(), MemInitializers.size());
1337}
1338
1339/// ParseMemInitializer - Parse a C++ member initializer, which is
1340/// part of a constructor initializer that explicitly initializes one
1341/// member or base class (C++ [class.base.init]). See
1342/// ParseConstructorInitializer for an example.
1343///
1344/// [C++] mem-initializer:
1345///         mem-initializer-id '(' expression-list[opt] ')'
1346///
1347/// [C++] mem-initializer-id:
1348///         '::'[opt] nested-name-specifier[opt] class-name
1349///         identifier
1350Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1351  // parse '::'[opt] nested-name-specifier[opt]
1352  CXXScopeSpec SS;
1353  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
1354  TypeTy *TemplateTypeTy = 0;
1355  if (Tok.is(tok::annot_template_id)) {
1356    TemplateIdAnnotation *TemplateId
1357      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1358    if (TemplateId->Kind == TNK_Type_template) {
1359      AnnotateTemplateIdTokenAsType(&SS);
1360      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1361      TemplateTypeTy = Tok.getAnnotationValue();
1362    }
1363    // FIXME. May need to check for TNK_Dependent_template as well.
1364  }
1365  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1366    Diag(Tok, diag::err_expected_member_or_base_name);
1367    return true;
1368  }
1369
1370  // Get the identifier. This may be a member name or a class name,
1371  // but we'll let the semantic analysis determine which it is.
1372  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1373  SourceLocation IdLoc = ConsumeToken();
1374
1375  // Parse the '('.
1376  if (Tok.isNot(tok::l_paren)) {
1377    Diag(Tok, diag::err_expected_lparen);
1378    return true;
1379  }
1380  SourceLocation LParenLoc = ConsumeParen();
1381
1382  // Parse the optional expression-list.
1383  ExprVector ArgExprs(Actions);
1384  CommaLocsTy CommaLocs;
1385  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1386    SkipUntil(tok::r_paren);
1387    return true;
1388  }
1389
1390  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1391
1392  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1393                                     TemplateTypeTy, IdLoc,
1394                                     LParenLoc, ArgExprs.take(),
1395                                     ArgExprs.size(), CommaLocs.data(),
1396                                     RParenLoc);
1397}
1398
1399/// ParseExceptionSpecification - Parse a C++ exception-specification
1400/// (C++ [except.spec]).
1401///
1402///       exception-specification:
1403///         'throw' '(' type-id-list [opt] ')'
1404/// [MS]    'throw' '(' '...' ')'
1405///
1406///       type-id-list:
1407///         type-id
1408///         type-id-list ',' type-id
1409///
1410bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1411                                         llvm::SmallVector<TypeTy*, 2>
1412                                             &Exceptions,
1413                                         llvm::SmallVector<SourceRange, 2>
1414                                             &Ranges,
1415                                         bool &hasAnyExceptionSpec) {
1416  assert(Tok.is(tok::kw_throw) && "expected throw");
1417
1418  SourceLocation ThrowLoc = ConsumeToken();
1419
1420  if (!Tok.is(tok::l_paren)) {
1421    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1422  }
1423  SourceLocation LParenLoc = ConsumeParen();
1424
1425  // Parse throw(...), a Microsoft extension that means "this function
1426  // can throw anything".
1427  if (Tok.is(tok::ellipsis)) {
1428    hasAnyExceptionSpec = true;
1429    SourceLocation EllipsisLoc = ConsumeToken();
1430    if (!getLang().Microsoft)
1431      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1432    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1433    return false;
1434  }
1435
1436  // Parse the sequence of type-ids.
1437  SourceRange Range;
1438  while (Tok.isNot(tok::r_paren)) {
1439    TypeResult Res(ParseTypeName(&Range));
1440    if (!Res.isInvalid()) {
1441      Exceptions.push_back(Res.get());
1442      Ranges.push_back(Range);
1443    }
1444    if (Tok.is(tok::comma))
1445      ConsumeToken();
1446    else
1447      break;
1448  }
1449
1450  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1451  return false;
1452}
1453
1454/// \brief We have just started parsing the definition of a new class,
1455/// so push that class onto our stack of classes that is currently
1456/// being parsed.
1457void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool TopLevelClass) {
1458  assert((TopLevelClass || !ClassStack.empty()) &&
1459         "Nested class without outer class");
1460  ClassStack.push(new ParsingClass(ClassDecl, TopLevelClass));
1461}
1462
1463/// \brief Deallocate the given parsed class and all of its nested
1464/// classes.
1465void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1466  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1467    DeallocateParsedClasses(Class->NestedClasses[I]);
1468  delete Class;
1469}
1470
1471/// \brief Pop the top class of the stack of classes that are
1472/// currently being parsed.
1473///
1474/// This routine should be called when we have finished parsing the
1475/// definition of a class, but have not yet popped the Scope
1476/// associated with the class's definition.
1477///
1478/// \returns true if the class we've popped is a top-level class,
1479/// false otherwise.
1480void Parser::PopParsingClass() {
1481  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1482
1483  ParsingClass *Victim = ClassStack.top();
1484  ClassStack.pop();
1485  if (Victim->TopLevelClass) {
1486    // Deallocate all of the nested classes of this class,
1487    // recursively: we don't need to keep any of this information.
1488    DeallocateParsedClasses(Victim);
1489    return;
1490  }
1491  assert(!ClassStack.empty() && "Missing top-level class?");
1492
1493  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1494      Victim->NestedClasses.empty()) {
1495    // The victim is a nested class, but we will not need to perform
1496    // any processing after the definition of this class since it has
1497    // no members whose handling was delayed. Therefore, we can just
1498    // remove this nested class.
1499    delete Victim;
1500    return;
1501  }
1502
1503  // This nested class has some members that will need to be processed
1504  // after the top-level class is completely defined. Therefore, add
1505  // it to the list of nested classes within its parent.
1506  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1507  ClassStack.top()->NestedClasses.push_back(Victim);
1508  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1509}
1510