ParseDeclCXX.cpp revision 961743326fd18776f897bf4461345dba680ef637 
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);
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);
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  CXXScopeSpec SS;
264  bool IsTypeName;
265
266  // Ignore optional 'typename'.
267  if (Tok.is(tok::kw_typename)) {
268    ConsumeToken();
269    IsTypeName = true;
270  }
271  else
272    IsTypeName = false;
273
274  // Parse nested-name-specifier.
275  ParseOptionalCXXScopeSpecifier(SS);
276
277  AttributeList *AttrList = 0;
278
279  // Check nested-name specifier.
280  if (SS.isInvalid()) {
281    SkipUntil(tok::semi);
282    return DeclPtrTy();
283  }
284  if (Tok.is(tok::annot_template_id)) {
285    Diag(Tok, diag::err_unexpected_template_spec_in_using);
286    SkipUntil(tok::semi);
287    return DeclPtrTy();
288  }
289
290  IdentifierInfo *TargetName = 0;
291  OverloadedOperatorKind Op = OO_None;
292  SourceLocation IdentLoc;
293
294  if (Tok.is(tok::kw_operator)) {
295    IdentLoc = Tok.getLocation();
296
297    Op = TryParseOperatorFunctionId();
298    if (!Op) {
299      // If there was an invalid operator, skip to end of decl, and eat ';'.
300      SkipUntil(tok::semi);
301      return DeclPtrTy();
302    }
303  } else if (Tok.is(tok::identifier)) {
304    // Parse identifier.
305    TargetName = Tok.getIdentifierInfo();
306    IdentLoc = ConsumeToken();
307  } else {
308    // FIXME: Use a better diagnostic here.
309    Diag(Tok, diag::err_expected_ident_in_using);
310
311    // If there was invalid identifier, skip to end of decl, and eat ';'.
312    SkipUntil(tok::semi);
313    return DeclPtrTy();
314  }
315
316  // Parse (optional) attributes (most likely GNU strong-using extension).
317  if (Tok.is(tok::kw___attribute))
318    AttrList = ParseAttributes();
319
320  // Eat ';'.
321  DeclEnd = Tok.getLocation();
322  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
323                   AttrList ? "attributes list" : "namespace name", tok::semi);
324
325  return Actions.ActOnUsingDeclaration(CurScope, UsingLoc, SS,
326                                       IdentLoc, TargetName, Op,
327                                       AttrList, IsTypeName);
328}
329
330/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
331///
332///      static_assert-declaration:
333///        static_assert ( constant-expression  ,  string-literal  ) ;
334///
335Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
336  assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
337  SourceLocation StaticAssertLoc = ConsumeToken();
338
339  if (Tok.isNot(tok::l_paren)) {
340    Diag(Tok, diag::err_expected_lparen);
341    return DeclPtrTy();
342  }
343
344  SourceLocation LParenLoc = ConsumeParen();
345
346  OwningExprResult AssertExpr(ParseConstantExpression());
347  if (AssertExpr.isInvalid()) {
348    SkipUntil(tok::semi);
349    return DeclPtrTy();
350  }
351
352  if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
353    return DeclPtrTy();
354
355  if (Tok.isNot(tok::string_literal)) {
356    Diag(Tok, diag::err_expected_string_literal);
357    SkipUntil(tok::semi);
358    return DeclPtrTy();
359  }
360
361  OwningExprResult AssertMessage(ParseStringLiteralExpression());
362  if (AssertMessage.isInvalid())
363    return DeclPtrTy();
364
365  MatchRHSPunctuation(tok::r_paren, LParenLoc);
366
367  DeclEnd = Tok.getLocation();
368  ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
369
370  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
371                                              move(AssertMessage));
372}
373
374/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
375///
376/// 'decltype' ( expression )
377///
378void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
379  assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
380
381  SourceLocation StartLoc = ConsumeToken();
382  SourceLocation LParenLoc = Tok.getLocation();
383
384  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
385                       "decltype")) {
386    SkipUntil(tok::r_paren);
387    return;
388  }
389
390  // Parse the expression
391
392  // C++0x [dcl.type.simple]p4:
393  //   The operand of the decltype specifier is an unevaluated operand.
394  EnterExpressionEvaluationContext Unevaluated(Actions,
395                                               Action::Unevaluated);
396  OwningExprResult Result = ParseExpression();
397  if (Result.isInvalid()) {
398    SkipUntil(tok::r_paren);
399    return;
400  }
401
402  // Match the ')'
403  SourceLocation RParenLoc;
404  if (Tok.is(tok::r_paren))
405    RParenLoc = ConsumeParen();
406  else
407    MatchRHSPunctuation(tok::r_paren, LParenLoc);
408
409  if (RParenLoc.isInvalid())
410    return;
411
412  const char *PrevSpec = 0;
413  // Check for duplicate type specifiers (e.g. "int decltype(a)").
414  if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
415                         Result.release()))
416    Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
417}
418
419/// ParseClassName - Parse a C++ class-name, which names a class. Note
420/// that we only check that the result names a type; semantic analysis
421/// will need to verify that the type names a class. The result is
422/// either a type or NULL, depending on whether a type name was
423/// found.
424///
425///       class-name: [C++ 9.1]
426///         identifier
427///         simple-template-id
428///
429Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
430                                          const CXXScopeSpec *SS) {
431  // Check whether we have a template-id that names a type.
432  if (Tok.is(tok::annot_template_id)) {
433    TemplateIdAnnotation *TemplateId
434      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
435    if (TemplateId->Kind == TNK_Type_template) {
436      AnnotateTemplateIdTokenAsType(SS);
437
438      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
439      TypeTy *Type = Tok.getAnnotationValue();
440      EndLocation = Tok.getAnnotationEndLoc();
441      ConsumeToken();
442
443      if (Type)
444        return Type;
445      return true;
446    }
447
448    // Fall through to produce an error below.
449  }
450
451  if (Tok.isNot(tok::identifier)) {
452    Diag(Tok, diag::err_expected_class_name);
453    return true;
454  }
455
456  // We have an identifier; check whether it is actually a type.
457  TypeTy *Type = Actions.getTypeName(*Tok.getIdentifierInfo(),
458                                     Tok.getLocation(), CurScope, SS);
459  if (!Type) {
460    Diag(Tok, diag::err_expected_class_name);
461    return true;
462  }
463
464  // Consume the identifier.
465  EndLocation = ConsumeToken();
466  return Type;
467}
468
469/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
470/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
471/// until we reach the start of a definition or see a token that
472/// cannot start a definition.
473///
474///       class-specifier: [C++ class]
475///         class-head '{' member-specification[opt] '}'
476///         class-head '{' member-specification[opt] '}' attributes[opt]
477///       class-head:
478///         class-key identifier[opt] base-clause[opt]
479///         class-key nested-name-specifier identifier base-clause[opt]
480///         class-key nested-name-specifier[opt] simple-template-id
481///                          base-clause[opt]
482/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
483/// [GNU]   class-key attributes[opt] nested-name-specifier
484///                          identifier base-clause[opt]
485/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
486///                          simple-template-id base-clause[opt]
487///       class-key:
488///         'class'
489///         'struct'
490///         'union'
491///
492///       elaborated-type-specifier: [C++ dcl.type.elab]
493///         class-key ::[opt] nested-name-specifier[opt] identifier
494///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
495///                          simple-template-id
496///
497///  Note that the C++ class-specifier and elaborated-type-specifier,
498///  together, subsume the C99 struct-or-union-specifier:
499///
500///       struct-or-union-specifier: [C99 6.7.2.1]
501///         struct-or-union identifier[opt] '{' struct-contents '}'
502///         struct-or-union identifier
503/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
504///                                                         '}' attributes[opt]
505/// [GNU]   struct-or-union attributes[opt] identifier
506///       struct-or-union:
507///         'struct'
508///         'union'
509void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
510                                 SourceLocation StartLoc, DeclSpec &DS,
511                                 const ParsedTemplateInfo &TemplateInfo,
512                                 AccessSpecifier AS) {
513  DeclSpec::TST TagType;
514  if (TagTokKind == tok::kw_struct)
515    TagType = DeclSpec::TST_struct;
516  else if (TagTokKind == tok::kw_class)
517    TagType = DeclSpec::TST_class;
518  else {
519    assert(TagTokKind == tok::kw_union && "Not a class specifier");
520    TagType = DeclSpec::TST_union;
521  }
522
523  AttributeList *Attr = 0;
524  // If attributes exist after tag, parse them.
525  if (Tok.is(tok::kw___attribute))
526    Attr = ParseAttributes();
527
528  // If declspecs exist after tag, parse them.
529  if (Tok.is(tok::kw___declspec))
530    Attr = ParseMicrosoftDeclSpec(Attr);
531
532  // Parse the (optional) nested-name-specifier.
533  CXXScopeSpec SS;
534  if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS))
535    if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
536      Diag(Tok, diag::err_expected_ident);
537
538  // Parse the (optional) class name or simple-template-id.
539  IdentifierInfo *Name = 0;
540  SourceLocation NameLoc;
541  TemplateIdAnnotation *TemplateId = 0;
542  if (Tok.is(tok::identifier)) {
543    Name = Tok.getIdentifierInfo();
544    NameLoc = ConsumeToken();
545  } else if (Tok.is(tok::annot_template_id)) {
546    TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
547    NameLoc = ConsumeToken();
548
549    if (TemplateId->Kind != TNK_Type_template) {
550      // The template-name in the simple-template-id refers to
551      // something other than a class template. Give an appropriate
552      // error message and skip to the ';'.
553      SourceRange Range(NameLoc);
554      if (SS.isNotEmpty())
555        Range.setBegin(SS.getBeginLoc());
556
557      Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
558        << Name << static_cast<int>(TemplateId->Kind) << Range;
559
560      DS.SetTypeSpecError();
561      SkipUntil(tok::semi, false, true);
562      TemplateId->Destroy();
563      return;
564    }
565  }
566
567  // There are three options here.  If we have 'struct foo;', then
568  // this is a forward declaration.  If we have 'struct foo {...' or
569  // 'struct foo :...' then this is a definition. Otherwise we have
570  // something like 'struct foo xyz', a reference.
571  Action::TagKind TK;
572  if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon)))
573    TK = Action::TK_Definition;
574  else if (Tok.is(tok::semi) && !DS.isFriendSpecified())
575    TK = Action::TK_Declaration;
576  else
577    TK = Action::TK_Reference;
578
579  if (!Name && !TemplateId && TK != Action::TK_Definition) {
580    // We have a declaration or reference to an anonymous class.
581    Diag(StartLoc, diag::err_anon_type_definition)
582      << DeclSpec::getSpecifierName(TagType);
583
584    // Skip the rest of this declarator, up until the comma or semicolon.
585    SkipUntil(tok::comma, true);
586
587    if (TemplateId)
588      TemplateId->Destroy();
589    return;
590  }
591
592  // Create the tag portion of the class or class template.
593  Action::DeclResult TagOrTempResult;
594  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
595
596  // FIXME: When TK == TK_Reference and we have a template-id, we need
597  // to turn that template-id into a type.
598
599  bool Owned = false;
600  if (TemplateId && TK != Action::TK_Reference) {
601    // Explicit specialization, class template partial specialization,
602    // or explicit instantiation.
603    ASTTemplateArgsPtr TemplateArgsPtr(Actions,
604                                       TemplateId->getTemplateArgs(),
605                                       TemplateId->getTemplateArgIsType(),
606                                       TemplateId->NumArgs);
607    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
608        TK == Action::TK_Declaration) {
609      // This is an explicit instantiation of a class template.
610      TagOrTempResult
611        = Actions.ActOnExplicitInstantiation(CurScope,
612                                             TemplateInfo.TemplateLoc,
613                                             TagType,
614                                             StartLoc,
615                                             SS,
616                                     TemplateTy::make(TemplateId->Template),
617                                             TemplateId->TemplateNameLoc,
618                                             TemplateId->LAngleLoc,
619                                             TemplateArgsPtr,
620                                      TemplateId->getTemplateArgLocations(),
621                                             TemplateId->RAngleLoc,
622                                             Attr);
623    } else {
624      // This is an explicit specialization or a class template
625      // partial specialization.
626      TemplateParameterLists FakedParamLists;
627
628      if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
629        // This looks like an explicit instantiation, because we have
630        // something like
631        //
632        //   template class Foo<X>
633        //
634        // but it actually has a definition. Most likely, this was
635        // meant to be an explicit specialization, but the user forgot
636        // the '<>' after 'template'.
637        assert(TK == Action::TK_Definition && "Expected a definition here");
638
639        SourceLocation LAngleLoc
640          = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
641        Diag(TemplateId->TemplateNameLoc,
642             diag::err_explicit_instantiation_with_definition)
643          << SourceRange(TemplateInfo.TemplateLoc)
644          << CodeModificationHint::CreateInsertion(LAngleLoc, "<>");
645
646        // Create a fake template parameter list that contains only
647        // "template<>", so that we treat this construct as a class
648        // template specialization.
649        FakedParamLists.push_back(
650          Actions.ActOnTemplateParameterList(0, SourceLocation(),
651                                             TemplateInfo.TemplateLoc,
652                                             LAngleLoc,
653                                             0, 0,
654                                             LAngleLoc));
655        TemplateParams = &FakedParamLists;
656      }
657
658      // Build the class template specialization.
659      TagOrTempResult
660        = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TK,
661                       StartLoc, SS,
662                       TemplateTy::make(TemplateId->Template),
663                       TemplateId->TemplateNameLoc,
664                       TemplateId->LAngleLoc,
665                       TemplateArgsPtr,
666                       TemplateId->getTemplateArgLocations(),
667                       TemplateId->RAngleLoc,
668                       Attr,
669                       Action::MultiTemplateParamsArg(Actions,
670                                    TemplateParams? &(*TemplateParams)[0] : 0,
671                                 TemplateParams? TemplateParams->size() : 0));
672    }
673    TemplateId->Destroy();
674  } else if (TemplateParams && TK != Action::TK_Reference) {
675    // Class template declaration or definition.
676    TagOrTempResult = Actions.ActOnClassTemplate(CurScope, TagType, TK,
677                                                 StartLoc, SS, Name, NameLoc,
678                                                 Attr,
679                       Action::MultiTemplateParamsArg(Actions,
680                                                      &(*TemplateParams)[0],
681                                                      TemplateParams->size()),
682                                                 AS);
683  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
684             TK == Action::TK_Declaration) {
685    // Explicit instantiation of a member of a class template
686    // specialization, e.g.,
687    //
688    //   template struct Outer<int>::Inner;
689    //
690    TagOrTempResult
691      = Actions.ActOnExplicitInstantiation(CurScope,
692                                           TemplateInfo.TemplateLoc,
693                                           TagType, StartLoc, SS, Name,
694                                           NameLoc, Attr);
695  } else {
696    if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
697        TK == Action::TK_Definition) {
698      // FIXME: Diagnose this particular error.
699    }
700
701    // Declaration or definition of a class type
702    TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, SS,
703                                       Name, NameLoc, Attr, AS, Owned);
704  }
705
706  // Parse the optional base clause (C++ only).
707  if (getLang().CPlusPlus && Tok.is(tok::colon))
708    ParseBaseClause(TagOrTempResult.get());
709
710  // If there is a body, parse it and inform the actions module.
711  if (Tok.is(tok::l_brace))
712    if (getLang().CPlusPlus)
713      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
714    else
715      ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
716  else if (TK == Action::TK_Definition) {
717    // FIXME: Complain that we have a base-specifier list but no
718    // definition.
719    Diag(Tok, diag::err_expected_lbrace);
720  }
721
722  const char *PrevSpec = 0;
723  if (TagOrTempResult.isInvalid()) {
724    DS.SetTypeSpecError();
725    return;
726  }
727
728  if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec,
729                         TagOrTempResult.get().getAs<void>(), Owned))
730    Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
731
732  if (DS.isFriendSpecified())
733    Actions.ActOnFriendDecl(CurScope, DS.getFriendSpecLoc(),
734                            TagOrTempResult.get());
735}
736
737/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
738///
739///       base-clause : [C++ class.derived]
740///         ':' base-specifier-list
741///       base-specifier-list:
742///         base-specifier '...'[opt]
743///         base-specifier-list ',' base-specifier '...'[opt]
744void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
745  assert(Tok.is(tok::colon) && "Not a base clause");
746  ConsumeToken();
747
748  // Build up an array of parsed base specifiers.
749  llvm::SmallVector<BaseTy *, 8> BaseInfo;
750
751  while (true) {
752    // Parse a base-specifier.
753    BaseResult Result = ParseBaseSpecifier(ClassDecl);
754    if (Result.isInvalid()) {
755      // Skip the rest of this base specifier, up until the comma or
756      // opening brace.
757      SkipUntil(tok::comma, tok::l_brace, true, true);
758    } else {
759      // Add this to our array of base specifiers.
760      BaseInfo.push_back(Result.get());
761    }
762
763    // If the next token is a comma, consume it and keep reading
764    // base-specifiers.
765    if (Tok.isNot(tok::comma)) break;
766
767    // Consume the comma.
768    ConsumeToken();
769  }
770
771  // Attach the base specifiers
772  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
773}
774
775/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
776/// one entry in the base class list of a class specifier, for example:
777///    class foo : public bar, virtual private baz {
778/// 'public bar' and 'virtual private baz' are each base-specifiers.
779///
780///       base-specifier: [C++ class.derived]
781///         ::[opt] nested-name-specifier[opt] class-name
782///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
783///                        class-name
784///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
785///                        class-name
786Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
787  bool IsVirtual = false;
788  SourceLocation StartLoc = Tok.getLocation();
789
790  // Parse the 'virtual' keyword.
791  if (Tok.is(tok::kw_virtual))  {
792    ConsumeToken();
793    IsVirtual = true;
794  }
795
796  // Parse an (optional) access specifier.
797  AccessSpecifier Access = getAccessSpecifierIfPresent();
798  if (Access)
799    ConsumeToken();
800
801  // Parse the 'virtual' keyword (again!), in case it came after the
802  // access specifier.
803  if (Tok.is(tok::kw_virtual))  {
804    SourceLocation VirtualLoc = ConsumeToken();
805    if (IsVirtual) {
806      // Complain about duplicate 'virtual'
807      Diag(VirtualLoc, diag::err_dup_virtual)
808        << CodeModificationHint::CreateRemoval(SourceRange(VirtualLoc));
809    }
810
811    IsVirtual = true;
812  }
813
814  // Parse optional '::' and optional nested-name-specifier.
815  CXXScopeSpec SS;
816  ParseOptionalCXXScopeSpecifier(SS);
817
818  // The location of the base class itself.
819  SourceLocation BaseLoc = Tok.getLocation();
820
821  // Parse the class-name.
822  SourceLocation EndLocation;
823  TypeResult BaseType = ParseClassName(EndLocation, &SS);
824  if (BaseType.isInvalid())
825    return true;
826
827  // Find the complete source range for the base-specifier.
828  SourceRange Range(StartLoc, EndLocation);
829
830  // Notify semantic analysis that we have parsed a complete
831  // base-specifier.
832  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
833                                    BaseType.get(), BaseLoc);
834}
835
836/// getAccessSpecifierIfPresent - Determine whether the next token is
837/// a C++ access-specifier.
838///
839///       access-specifier: [C++ class.derived]
840///         'private'
841///         'protected'
842///         'public'
843AccessSpecifier Parser::getAccessSpecifierIfPresent() const
844{
845  switch (Tok.getKind()) {
846  default: return AS_none;
847  case tok::kw_private: return AS_private;
848  case tok::kw_protected: return AS_protected;
849  case tok::kw_public: return AS_public;
850  }
851}
852
853/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
854///
855///       member-declaration:
856///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
857///         function-definition ';'[opt]
858///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
859///         using-declaration                                            [TODO]
860/// [C++0x] static_assert-declaration
861///         template-declaration
862/// [GNU]   '__extension__' member-declaration
863///
864///       member-declarator-list:
865///         member-declarator
866///         member-declarator-list ',' member-declarator
867///
868///       member-declarator:
869///         declarator pure-specifier[opt]
870///         declarator constant-initializer[opt]
871///         identifier[opt] ':' constant-expression
872///
873///       pure-specifier:
874///         '= 0'
875///
876///       constant-initializer:
877///         '=' constant-expression
878///
879void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS) {
880  // static_assert-declaration
881  if (Tok.is(tok::kw_static_assert)) {
882    SourceLocation DeclEnd;
883    ParseStaticAssertDeclaration(DeclEnd);
884    return;
885  }
886
887  if (Tok.is(tok::kw_template)) {
888    SourceLocation DeclEnd;
889    ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
890                                         AS);
891    return;
892  }
893
894  // Handle:  member-declaration ::= '__extension__' member-declaration
895  if (Tok.is(tok::kw___extension__)) {
896    // __extension__ silences extension warnings in the subexpression.
897    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
898    ConsumeToken();
899    return ParseCXXClassMemberDeclaration(AS);
900  }
901
902  if (Tok.is(tok::kw_using)) {
903    // Eat 'using'.
904    SourceLocation UsingLoc = ConsumeToken();
905
906    if (Tok.is(tok::kw_namespace)) {
907      Diag(UsingLoc, diag::err_using_namespace_in_class);
908      SkipUntil(tok::semi, true, true);
909    }
910    else {
911      SourceLocation DeclEnd;
912      // Otherwise, it must be using-declaration.
913      ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd);
914    }
915    return;
916  }
917
918  SourceLocation DSStart = Tok.getLocation();
919  // decl-specifier-seq:
920  // Parse the common declaration-specifiers piece.
921  DeclSpec DS;
922  ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS);
923
924  if (Tok.is(tok::semi)) {
925    ConsumeToken();
926    // C++ 9.2p7: The member-declarator-list can be omitted only after a
927    // class-specifier or an enum-specifier or in a friend declaration.
928    // FIXME: Friend declarations.
929    switch (DS.getTypeSpecType()) {
930    case DeclSpec::TST_struct:
931    case DeclSpec::TST_union:
932    case DeclSpec::TST_class:
933    case DeclSpec::TST_enum:
934      Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
935      return;
936    default:
937      Diag(DSStart, diag::err_no_declarators);
938      return;
939    }
940  }
941
942  Declarator DeclaratorInfo(DS, Declarator::MemberContext);
943
944  if (Tok.isNot(tok::colon)) {
945    // Parse the first declarator.
946    ParseDeclarator(DeclaratorInfo);
947    // Error parsing the declarator?
948    if (!DeclaratorInfo.hasName()) {
949      // If so, skip until the semi-colon or a }.
950      SkipUntil(tok::r_brace, true);
951      if (Tok.is(tok::semi))
952        ConsumeToken();
953      return;
954    }
955
956    // function-definition:
957    if (Tok.is(tok::l_brace)
958        || (DeclaratorInfo.isFunctionDeclarator() &&
959            (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
960      if (!DeclaratorInfo.isFunctionDeclarator()) {
961        Diag(Tok, diag::err_func_def_no_params);
962        ConsumeBrace();
963        SkipUntil(tok::r_brace, true);
964        return;
965      }
966
967      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
968        Diag(Tok, diag::err_function_declared_typedef);
969        // This recovery skips the entire function body. It would be nice
970        // to simply call ParseCXXInlineMethodDef() below, however Sema
971        // assumes the declarator represents a function, not a typedef.
972        ConsumeBrace();
973        SkipUntil(tok::r_brace, true);
974        return;
975      }
976
977      ParseCXXInlineMethodDef(AS, DeclaratorInfo);
978      return;
979    }
980  }
981
982  // member-declarator-list:
983  //   member-declarator
984  //   member-declarator-list ',' member-declarator
985
986  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
987  OwningExprResult BitfieldSize(Actions);
988  OwningExprResult Init(Actions);
989  bool Deleted = false;
990
991  while (1) {
992
993    // member-declarator:
994    //   declarator pure-specifier[opt]
995    //   declarator constant-initializer[opt]
996    //   identifier[opt] ':' constant-expression
997
998    if (Tok.is(tok::colon)) {
999      ConsumeToken();
1000      BitfieldSize = ParseConstantExpression();
1001      if (BitfieldSize.isInvalid())
1002        SkipUntil(tok::comma, true, true);
1003    }
1004
1005    // pure-specifier:
1006    //   '= 0'
1007    //
1008    // constant-initializer:
1009    //   '=' constant-expression
1010    //
1011    // defaulted/deleted function-definition:
1012    //   '=' 'default'                          [TODO]
1013    //   '=' 'delete'
1014
1015    if (Tok.is(tok::equal)) {
1016      ConsumeToken();
1017      if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
1018        ConsumeToken();
1019        Deleted = true;
1020      } else {
1021        Init = ParseInitializer();
1022        if (Init.isInvalid())
1023          SkipUntil(tok::comma, true, true);
1024      }
1025    }
1026
1027    // If attributes exist after the declarator, parse them.
1028    if (Tok.is(tok::kw___attribute)) {
1029      SourceLocation Loc;
1030      AttributeList *AttrList = ParseAttributes(&Loc);
1031      DeclaratorInfo.AddAttributes(AttrList, Loc);
1032    }
1033
1034    // NOTE: If Sema is the Action module and declarator is an instance field,
1035    // this call will *not* return the created decl; It will return null.
1036    // See Sema::ActOnCXXMemberDeclarator for details.
1037    DeclPtrTy ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
1038                                                          DeclaratorInfo,
1039                                                          BitfieldSize.release(),
1040                                                          Init.release(),
1041                                                          Deleted);
1042    if (ThisDecl)
1043      DeclsInGroup.push_back(ThisDecl);
1044
1045    if (DeclaratorInfo.isFunctionDeclarator() &&
1046        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1047          != DeclSpec::SCS_typedef) {
1048      // We just declared a member function. If this member function
1049      // has any default arguments, we'll need to parse them later.
1050      LateParsedMethodDeclaration *LateMethod = 0;
1051      DeclaratorChunk::FunctionTypeInfo &FTI
1052        = DeclaratorInfo.getTypeObject(0).Fun;
1053      for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1054        if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1055          if (!LateMethod) {
1056            // Push this method onto the stack of late-parsed method
1057            // declarations.
1058            getCurrentClass().MethodDecls.push_back(
1059                                   LateParsedMethodDeclaration(ThisDecl));
1060            LateMethod = &getCurrentClass().MethodDecls.back();
1061
1062            // Add all of the parameters prior to this one (they don't
1063            // have default arguments).
1064            LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1065            for (unsigned I = 0; I < ParamIdx; ++I)
1066              LateMethod->DefaultArgs.push_back(
1067                        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
1068          }
1069
1070          // Add this parameter to the list of parameters (it or may
1071          // not have a default argument).
1072          LateMethod->DefaultArgs.push_back(
1073            LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1074                                      FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1075        }
1076      }
1077    }
1078
1079    // If we don't have a comma, it is either the end of the list (a ';')
1080    // or an error, bail out.
1081    if (Tok.isNot(tok::comma))
1082      break;
1083
1084    // Consume the comma.
1085    ConsumeToken();
1086
1087    // Parse the next declarator.
1088    DeclaratorInfo.clear();
1089    BitfieldSize = 0;
1090    Init = 0;
1091    Deleted = false;
1092
1093    // Attributes are only allowed on the second declarator.
1094    if (Tok.is(tok::kw___attribute)) {
1095      SourceLocation Loc;
1096      AttributeList *AttrList = ParseAttributes(&Loc);
1097      DeclaratorInfo.AddAttributes(AttrList, Loc);
1098    }
1099
1100    if (Tok.isNot(tok::colon))
1101      ParseDeclarator(DeclaratorInfo);
1102  }
1103
1104  if (Tok.is(tok::semi)) {
1105    ConsumeToken();
1106    Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
1107                                    DeclsInGroup.size());
1108    return;
1109  }
1110
1111  Diag(Tok, diag::err_expected_semi_decl_list);
1112  // Skip to end of block or statement
1113  SkipUntil(tok::r_brace, true, true);
1114  if (Tok.is(tok::semi))
1115    ConsumeToken();
1116  return;
1117}
1118
1119/// ParseCXXMemberSpecification - Parse the class definition.
1120///
1121///       member-specification:
1122///         member-declaration member-specification[opt]
1123///         access-specifier ':' member-specification[opt]
1124///
1125void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1126                                         unsigned TagType, DeclPtrTy TagDecl) {
1127  assert((TagType == DeclSpec::TST_struct ||
1128         TagType == DeclSpec::TST_union  ||
1129         TagType == DeclSpec::TST_class) && "Invalid TagType!");
1130
1131  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1132                                        PP.getSourceManager(),
1133                                        "parsing struct/union/class body");
1134
1135  SourceLocation LBraceLoc = ConsumeBrace();
1136
1137  // Determine whether this is a top-level (non-nested) class.
1138  bool TopLevelClass = ClassStack.empty() ||
1139    CurScope->isInCXXInlineMethodScope();
1140
1141  // Enter a scope for the class.
1142  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
1143
1144  // Note that we are parsing a new (potentially-nested) class definition.
1145  ParsingClassDefinition ParsingDef(*this, TagDecl, TopLevelClass);
1146
1147  if (TagDecl)
1148    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1149  else {
1150    SkipUntil(tok::r_brace, false, false);
1151    return;
1152  }
1153
1154  // C++ 11p3: Members of a class defined with the keyword class are private
1155  // by default. Members of a class defined with the keywords struct or union
1156  // are public by default.
1157  AccessSpecifier CurAS;
1158  if (TagType == DeclSpec::TST_class)
1159    CurAS = AS_private;
1160  else
1161    CurAS = AS_public;
1162
1163  // While we still have something to read, read the member-declarations.
1164  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1165    // Each iteration of this loop reads one member-declaration.
1166
1167    // Check for extraneous top-level semicolon.
1168    if (Tok.is(tok::semi)) {
1169      Diag(Tok, diag::ext_extra_struct_semi);
1170      ConsumeToken();
1171      continue;
1172    }
1173
1174    AccessSpecifier AS = getAccessSpecifierIfPresent();
1175    if (AS != AS_none) {
1176      // Current token is a C++ access specifier.
1177      CurAS = AS;
1178      ConsumeToken();
1179      ExpectAndConsume(tok::colon, diag::err_expected_colon);
1180      continue;
1181    }
1182
1183    // Parse all the comma separated declarators.
1184    ParseCXXClassMemberDeclaration(CurAS);
1185  }
1186
1187  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1188
1189  AttributeList *AttrList = 0;
1190  // If attributes exist after class contents, parse them.
1191  if (Tok.is(tok::kw___attribute))
1192    AttrList = ParseAttributes(); // FIXME: where should I put them?
1193
1194  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
1195                                            LBraceLoc, RBraceLoc);
1196
1197  // C++ 9.2p2: Within the class member-specification, the class is regarded as
1198  // complete within function bodies, default arguments,
1199  // exception-specifications, and constructor ctor-initializers (including
1200  // such things in nested classes).
1201  //
1202  // FIXME: Only function bodies and constructor ctor-initializers are
1203  // parsed correctly, fix the rest.
1204  if (TopLevelClass) {
1205    // We are not inside a nested class. This class and its nested classes
1206    // are complete and we can parse the delayed portions of method
1207    // declarations and the lexed inline method definitions.
1208    ParseLexedMethodDeclarations(getCurrentClass());
1209    ParseLexedMethodDefs(getCurrentClass());
1210  }
1211
1212  // Leave the class scope.
1213  ParsingDef.Pop();
1214  ClassScope.Exit();
1215
1216  Actions.ActOnTagFinishDefinition(CurScope, TagDecl);
1217}
1218
1219/// ParseConstructorInitializer - Parse a C++ constructor initializer,
1220/// which explicitly initializes the members or base classes of a
1221/// class (C++ [class.base.init]). For example, the three initializers
1222/// after the ':' in the Derived constructor below:
1223///
1224/// @code
1225/// class Base { };
1226/// class Derived : Base {
1227///   int x;
1228///   float f;
1229/// public:
1230///   Derived(float f) : Base(), x(17), f(f) { }
1231/// };
1232/// @endcode
1233///
1234/// [C++]  ctor-initializer:
1235///          ':' mem-initializer-list
1236///
1237/// [C++]  mem-initializer-list:
1238///          mem-initializer
1239///          mem-initializer , mem-initializer-list
1240void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
1241  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
1242
1243  SourceLocation ColonLoc = ConsumeToken();
1244
1245  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
1246
1247  do {
1248    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
1249    if (!MemInit.isInvalid())
1250      MemInitializers.push_back(MemInit.get());
1251
1252    if (Tok.is(tok::comma))
1253      ConsumeToken();
1254    else if (Tok.is(tok::l_brace))
1255      break;
1256    else {
1257      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
1258      Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
1259      SkipUntil(tok::l_brace, true, true);
1260      break;
1261    }
1262  } while (true);
1263
1264  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
1265                               MemInitializers.data(), MemInitializers.size());
1266}
1267
1268/// ParseMemInitializer - Parse a C++ member initializer, which is
1269/// part of a constructor initializer that explicitly initializes one
1270/// member or base class (C++ [class.base.init]). See
1271/// ParseConstructorInitializer for an example.
1272///
1273/// [C++] mem-initializer:
1274///         mem-initializer-id '(' expression-list[opt] ')'
1275///
1276/// [C++] mem-initializer-id:
1277///         '::'[opt] nested-name-specifier[opt] class-name
1278///         identifier
1279Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
1280  // parse '::'[opt] nested-name-specifier[opt]
1281  CXXScopeSpec SS;
1282  ParseOptionalCXXScopeSpecifier(SS);
1283  TypeTy *TemplateTypeTy = 0;
1284  if (Tok.is(tok::annot_template_id)) {
1285    TemplateIdAnnotation *TemplateId
1286      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1287    if (TemplateId->Kind == TNK_Type_template) {
1288      AnnotateTemplateIdTokenAsType(&SS);
1289      assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1290      TemplateTypeTy = Tok.getAnnotationValue();
1291    }
1292    // FIXME. May need to check for TNK_Dependent_template as well.
1293  }
1294  if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
1295    Diag(Tok, diag::err_expected_member_or_base_name);
1296    return true;
1297  }
1298
1299  // Get the identifier. This may be a member name or a class name,
1300  // but we'll let the semantic analysis determine which it is.
1301  IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
1302  SourceLocation IdLoc = ConsumeToken();
1303
1304  // Parse the '('.
1305  if (Tok.isNot(tok::l_paren)) {
1306    Diag(Tok, diag::err_expected_lparen);
1307    return true;
1308  }
1309  SourceLocation LParenLoc = ConsumeParen();
1310
1311  // Parse the optional expression-list.
1312  ExprVector ArgExprs(Actions);
1313  CommaLocsTy CommaLocs;
1314  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
1315    SkipUntil(tok::r_paren);
1316    return true;
1317  }
1318
1319  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1320
1321  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
1322                                     TemplateTypeTy, IdLoc,
1323                                     LParenLoc, ArgExprs.take(),
1324                                     ArgExprs.size(), CommaLocs.data(),
1325                                     RParenLoc);
1326}
1327
1328/// ParseExceptionSpecification - Parse a C++ exception-specification
1329/// (C++ [except.spec]).
1330///
1331///       exception-specification:
1332///         'throw' '(' type-id-list [opt] ')'
1333/// [MS]    'throw' '(' '...' ')'
1334///
1335///       type-id-list:
1336///         type-id
1337///         type-id-list ',' type-id
1338///
1339bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
1340                                         llvm::SmallVector<TypeTy*, 2>
1341                                             &Exceptions,
1342                                         llvm::SmallVector<SourceRange, 2>
1343                                             &Ranges,
1344                                         bool &hasAnyExceptionSpec) {
1345  assert(Tok.is(tok::kw_throw) && "expected throw");
1346
1347  SourceLocation ThrowLoc = ConsumeToken();
1348
1349  if (!Tok.is(tok::l_paren)) {
1350    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
1351  }
1352  SourceLocation LParenLoc = ConsumeParen();
1353
1354  // Parse throw(...), a Microsoft extension that means "this function
1355  // can throw anything".
1356  if (Tok.is(tok::ellipsis)) {
1357    hasAnyExceptionSpec = true;
1358    SourceLocation EllipsisLoc = ConsumeToken();
1359    if (!getLang().Microsoft)
1360      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
1361    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1362    return false;
1363  }
1364
1365  // Parse the sequence of type-ids.
1366  SourceRange Range;
1367  while (Tok.isNot(tok::r_paren)) {
1368    TypeResult Res(ParseTypeName(&Range));
1369    if (!Res.isInvalid()) {
1370      Exceptions.push_back(Res.get());
1371      Ranges.push_back(Range);
1372    }
1373    if (Tok.is(tok::comma))
1374      ConsumeToken();
1375    else
1376      break;
1377  }
1378
1379  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
1380  return false;
1381}
1382
1383/// \brief We have just started parsing the definition of a new class,
1384/// so push that class onto our stack of classes that is currently
1385/// being parsed.
1386void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool TopLevelClass) {
1387  assert((TopLevelClass || !ClassStack.empty()) &&
1388         "Nested class without outer class");
1389  ClassStack.push(new ParsingClass(ClassDecl, TopLevelClass));
1390}
1391
1392/// \brief Deallocate the given parsed class and all of its nested
1393/// classes.
1394void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
1395  for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
1396    DeallocateParsedClasses(Class->NestedClasses[I]);
1397  delete Class;
1398}
1399
1400/// \brief Pop the top class of the stack of classes that are
1401/// currently being parsed.
1402///
1403/// This routine should be called when we have finished parsing the
1404/// definition of a class, but have not yet popped the Scope
1405/// associated with the class's definition.
1406///
1407/// \returns true if the class we've popped is a top-level class,
1408/// false otherwise.
1409void Parser::PopParsingClass() {
1410  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
1411
1412  ParsingClass *Victim = ClassStack.top();
1413  ClassStack.pop();
1414  if (Victim->TopLevelClass) {
1415    // Deallocate all of the nested classes of this class,
1416    // recursively: we don't need to keep any of this information.
1417    DeallocateParsedClasses(Victim);
1418    return;
1419  }
1420  assert(!ClassStack.empty() && "Missing top-level class?");
1421
1422  if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
1423      Victim->NestedClasses.empty()) {
1424    // The victim is a nested class, but we will not need to perform
1425    // any processing after the definition of this class since it has
1426    // no members whose handling was delayed. Therefore, we can just
1427    // remove this nested class.
1428    delete Victim;
1429    return;
1430  }
1431
1432  // This nested class has some members that will need to be processed
1433  // after the top-level class is completely defined. Therefore, add
1434  // it to the list of nested classes within its parent.
1435  assert(CurScope->isClassScope() && "Nested class outside of class scope?");
1436  ClassStack.top()->NestedClasses.push_back(Victim);
1437  Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
1438}
1439