ParseDeclCXX.cpp revision 823c44e6d73141f642e207980b4021ddcf09897b 
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/Parse/Parser.h"
15#include "clang/Basic/Diagnostic.h"
16#include "clang/Parse/DeclSpec.h"
17#include "clang/Parse/Scope.h"
18#include "AstGuard.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::DeclTy *Parser::ParseNamespace(unsigned Context) {
46  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
47  SourceLocation NamespaceLoc = ConsumeToken();  // eat the 'namespace'.
48
49  SourceLocation IdentLoc;
50  IdentifierInfo *Ident = 0;
51
52  if (Tok.is(tok::identifier)) {
53    Ident = Tok.getIdentifierInfo();
54    IdentLoc = ConsumeToken();  // eat the identifier.
55  }
56
57  // Read label attributes, if present.
58  DeclTy *AttrList = 0;
59  if (Tok.is(tok::kw___attribute))
60    // FIXME: save these somewhere.
61    AttrList = ParseAttributes();
62
63  if (Tok.is(tok::equal)) {
64    // FIXME: Verify no attributes were present.
65    // FIXME: parse this.
66  } else if (Tok.is(tok::l_brace)) {
67
68    SourceLocation LBrace = ConsumeBrace();
69
70    // Enter a scope for the namespace.
71    ParseScope NamespaceScope(this, Scope::DeclScope);
72
73    DeclTy *NamespcDecl =
74      Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace);
75
76    while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof))
77      ParseExternalDeclaration();
78
79    // Leave the namespace scope.
80    NamespaceScope.Exit();
81
82    SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
83    Actions.ActOnFinishNamespaceDef(NamespcDecl, RBrace);
84
85    return NamespcDecl;
86
87  } else {
88    Diag(Tok, Ident ? diag::err_expected_lbrace :
89                      diag::err_expected_ident_lbrace);
90  }
91
92  return 0;
93}
94
95/// ParseLinkage - We know that the current token is a string_literal
96/// and just before that, that extern was seen.
97///
98///       linkage-specification: [C++ 7.5p2: dcl.link]
99///         'extern' string-literal '{' declaration-seq[opt] '}'
100///         'extern' string-literal declaration
101///
102Parser::DeclTy *Parser::ParseLinkage(unsigned Context) {
103  assert(Tok.is(tok::string_literal) && "Not a string literal!");
104  llvm::SmallVector<char, 8> LangBuffer;
105  // LangBuffer is guaranteed to be big enough.
106  LangBuffer.resize(Tok.getLength());
107  const char *LangBufPtr = &LangBuffer[0];
108  unsigned StrSize = PP.getSpelling(Tok, LangBufPtr);
109
110  SourceLocation Loc = ConsumeStringToken();
111
112  ParseScope LinkageScope(this, Scope::DeclScope);
113  DeclTy *LinkageSpec
114    = Actions.ActOnStartLinkageSpecification(CurScope,
115                                             /*FIXME: */SourceLocation(),
116                                             Loc, LangBufPtr, StrSize,
117                                       Tok.is(tok::l_brace)? Tok.getLocation()
118                                                           : SourceLocation());
119
120  if (Tok.isNot(tok::l_brace)) {
121    ParseDeclarationOrFunctionDefinition();
122    return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
123                                                   SourceLocation());
124  }
125
126  SourceLocation LBrace = ConsumeBrace();
127  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
128    ParseExternalDeclaration();
129  }
130
131  SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
132  return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
133}
134
135/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
136/// using-directive. Assumes that current token is 'using'.
137Parser::DeclTy *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context) {
138  assert(Tok.is(tok::kw_using) && "Not using token");
139
140  // Eat 'using'.
141  SourceLocation UsingLoc = ConsumeToken();
142
143  if (Tok.is(tok::kw_namespace))
144    // Next token after 'using' is 'namespace' so it must be using-directive
145    return ParseUsingDirective(Context, UsingLoc);
146
147  // Otherwise, it must be using-declaration.
148  return ParseUsingDeclaration(Context, UsingLoc);
149}
150
151/// ParseUsingDirective - Parse C++ using-directive, assumes
152/// that current token is 'namespace' and 'using' was already parsed.
153///
154///       using-directive: [C++ 7.3.p4: namespace.udir]
155///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
156///                 namespace-name ;
157/// [GNU] using-directive:
158///        'using' 'namespace' ::[opt] nested-name-specifier[opt]
159///                 namespace-name attributes[opt] ;
160///
161Parser::DeclTy *Parser::ParseUsingDirective(unsigned Context,
162                                            SourceLocation UsingLoc) {
163  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
164
165  // Eat 'namespace'.
166  SourceLocation NamespcLoc = ConsumeToken();
167
168  CXXScopeSpec SS;
169  // Parse (optional) nested-name-specifier.
170  ParseOptionalCXXScopeSpecifier(SS);
171
172  AttributeList *AttrList = 0;
173  IdentifierInfo *NamespcName = 0;
174  SourceLocation IdentLoc = SourceLocation();
175
176  // Parse namespace-name.
177  if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
178    Diag(Tok, diag::err_expected_namespace_name);
179    // If there was invalid namespace name, skip to end of decl, and eat ';'.
180    SkipUntil(tok::semi);
181    // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
182    return 0;
183  }
184
185  // Parse identifier.
186  NamespcName = Tok.getIdentifierInfo();
187  IdentLoc = ConsumeToken();
188
189  // Parse (optional) attributes (most likely GNU strong-using extension).
190  if (Tok.is(tok::kw___attribute))
191    AttrList = ParseAttributes();
192
193  // Eat ';'.
194  ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
195                   AttrList ? "attributes list" : "namespace name", tok::semi);
196
197  return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
198                                      IdentLoc, NamespcName, AttrList);
199}
200
201/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
202/// 'using' was already seen.
203///
204///     using-declaration: [C++ 7.3.p3: namespace.udecl]
205///       'using' 'typename'[opt] ::[opt] nested-name-specifier
206///               unqualified-id [TODO]
207///       'using' :: unqualified-id [TODO]
208///
209Parser::DeclTy *Parser::ParseUsingDeclaration(unsigned Context,
210                                              SourceLocation UsingLoc) {
211  assert(false && "Not implemented");
212  // FIXME: Implement parsing.
213  return 0;
214}
215
216/// ParseClassName - Parse a C++ class-name, which names a class. Note
217/// that we only check that the result names a type; semantic analysis
218/// will need to verify that the type names a class. The result is
219/// either a type or NULL, dependending on whether a type name was
220/// found.
221///
222///       class-name: [C++ 9.1]
223///         identifier
224///         template-id   [TODO]
225///
226Parser::TypeTy *Parser::ParseClassName(const CXXScopeSpec *SS) {
227  // Parse the class-name.
228  // FIXME: Alternatively, parse a simple-template-id.
229  if (Tok.isNot(tok::identifier)) {
230    Diag(Tok, diag::err_expected_class_name);
231    return 0;
232  }
233
234  // We have an identifier; check whether it is actually a type.
235  TypeTy *Type = Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope, SS);
236  if (!Type) {
237    Diag(Tok, diag::err_expected_class_name);
238    return 0;
239  }
240
241  // Consume the identifier.
242  ConsumeToken();
243
244  return Type;
245}
246
247/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
248/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
249/// until we reach the start of a definition or see a token that
250/// cannot start a definition.
251///
252///       class-specifier: [C++ class]
253///         class-head '{' member-specification[opt] '}'
254///         class-head '{' member-specification[opt] '}' attributes[opt]
255///       class-head:
256///         class-key identifier[opt] base-clause[opt]
257///         class-key nested-name-specifier identifier base-clause[opt]
258///         class-key nested-name-specifier[opt] simple-template-id
259///                          base-clause[opt]
260/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
261/// [GNU]   class-key attributes[opt] nested-name-specifier
262///                          identifier base-clause[opt]
263/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
264///                          simple-template-id base-clause[opt]
265///       class-key:
266///         'class'
267///         'struct'
268///         'union'
269///
270///       elaborated-type-specifier: [C++ dcl.type.elab]
271///         class-key ::[opt] nested-name-specifier[opt] identifier
272///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
273///                          simple-template-id
274///
275///  Note that the C++ class-specifier and elaborated-type-specifier,
276///  together, subsume the C99 struct-or-union-specifier:
277///
278///       struct-or-union-specifier: [C99 6.7.2.1]
279///         struct-or-union identifier[opt] '{' struct-contents '}'
280///         struct-or-union identifier
281/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
282///                                                         '}' attributes[opt]
283/// [GNU]   struct-or-union attributes[opt] identifier
284///       struct-or-union:
285///         'struct'
286///         'union'
287void Parser::ParseClassSpecifier(DeclSpec &DS,
288                                 TemplateParameterLists *TemplateParams) {
289  assert((Tok.is(tok::kw_class) ||
290          Tok.is(tok::kw_struct) ||
291          Tok.is(tok::kw_union)) &&
292         "Not a class specifier");
293  DeclSpec::TST TagType =
294    Tok.is(tok::kw_class) ? DeclSpec::TST_class :
295    Tok.is(tok::kw_struct) ? DeclSpec::TST_struct :
296    DeclSpec::TST_union;
297
298  SourceLocation StartLoc = ConsumeToken();
299
300  AttributeList *Attr = 0;
301  // If attributes exist after tag, parse them.
302  if (Tok.is(tok::kw___attribute))
303    Attr = ParseAttributes();
304
305  // If declspecs exist after tag, parse them.
306  if (Tok.is(tok::kw___declspec) && PP.getLangOptions().Microsoft)
307    FuzzyParseMicrosoftDeclSpec();
308
309  // Parse the (optional) nested-name-specifier.
310  CXXScopeSpec SS;
311  if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS)) {
312    if (Tok.isNot(tok::identifier))
313      Diag(Tok, diag::err_expected_ident);
314  }
315
316  // Parse the (optional) class name.
317  // FIXME: Alternatively, parse a simple-template-id.
318  IdentifierInfo *Name = 0;
319  SourceLocation NameLoc;
320  if (Tok.is(tok::identifier)) {
321    Name = Tok.getIdentifierInfo();
322    NameLoc = ConsumeToken();
323  }
324
325  // There are three options here.  If we have 'struct foo;', then
326  // this is a forward declaration.  If we have 'struct foo {...' or
327  // 'struct fo :...' then this is a definition. Otherwise we have
328  // something like 'struct foo xyz', a reference.
329  Action::TagKind TK;
330  if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon)))
331    TK = Action::TK_Definition;
332  else if (Tok.is(tok::semi))
333    TK = Action::TK_Declaration;
334  else
335    TK = Action::TK_Reference;
336
337  if (!Name && TK != Action::TK_Definition) {
338    // We have a declaration or reference to an anonymous class.
339    Diag(StartLoc, diag::err_anon_type_definition)
340      << DeclSpec::getSpecifierName(TagType);
341
342    // Skip the rest of this declarator, up until the comma or semicolon.
343    SkipUntil(tok::comma, true);
344    return;
345  }
346
347  // Parse the tag portion of this.
348  DeclTy *TagDecl
349    = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, SS, Name,
350                       NameLoc, Attr,
351                       Action::MultiTemplateParamsArg(
352                         Actions,
353                         TemplateParams? &(*TemplateParams)[0] : 0,
354                         TemplateParams? TemplateParams->size() : 0));
355
356  // Parse the optional base clause (C++ only).
357  if (getLang().CPlusPlus && Tok.is(tok::colon)) {
358    ParseBaseClause(TagDecl);
359  }
360
361  // If there is a body, parse it and inform the actions module.
362  if (Tok.is(tok::l_brace))
363    if (getLang().CPlusPlus)
364      ParseCXXMemberSpecification(StartLoc, TagType, TagDecl);
365    else
366      ParseStructUnionBody(StartLoc, TagType, TagDecl);
367  else if (TK == Action::TK_Definition) {
368    // FIXME: Complain that we have a base-specifier list but no
369    // definition.
370    Diag(Tok, diag::err_expected_lbrace);
371  }
372
373  const char *PrevSpec = 0;
374  if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, TagDecl))
375    Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
376}
377
378/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
379///
380///       base-clause : [C++ class.derived]
381///         ':' base-specifier-list
382///       base-specifier-list:
383///         base-specifier '...'[opt]
384///         base-specifier-list ',' base-specifier '...'[opt]
385void Parser::ParseBaseClause(DeclTy *ClassDecl)
386{
387  assert(Tok.is(tok::colon) && "Not a base clause");
388  ConsumeToken();
389
390  // Build up an array of parsed base specifiers.
391  llvm::SmallVector<BaseTy *, 8> BaseInfo;
392
393  while (true) {
394    // Parse a base-specifier.
395    BaseResult Result = ParseBaseSpecifier(ClassDecl);
396    if (Result.isInvalid) {
397      // Skip the rest of this base specifier, up until the comma or
398      // opening brace.
399      SkipUntil(tok::comma, tok::l_brace, true, true);
400    } else {
401      // Add this to our array of base specifiers.
402      BaseInfo.push_back(Result.Val);
403    }
404
405    // If the next token is a comma, consume it and keep reading
406    // base-specifiers.
407    if (Tok.isNot(tok::comma)) break;
408
409    // Consume the comma.
410    ConsumeToken();
411  }
412
413  // Attach the base specifiers
414  Actions.ActOnBaseSpecifiers(ClassDecl, &BaseInfo[0], BaseInfo.size());
415}
416
417/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
418/// one entry in the base class list of a class specifier, for example:
419///    class foo : public bar, virtual private baz {
420/// 'public bar' and 'virtual private baz' are each base-specifiers.
421///
422///       base-specifier: [C++ class.derived]
423///         ::[opt] nested-name-specifier[opt] class-name
424///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
425///                        class-name
426///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
427///                        class-name
428Parser::BaseResult Parser::ParseBaseSpecifier(DeclTy *ClassDecl)
429{
430  bool IsVirtual = false;
431  SourceLocation StartLoc = Tok.getLocation();
432
433  // Parse the 'virtual' keyword.
434  if (Tok.is(tok::kw_virtual))  {
435    ConsumeToken();
436    IsVirtual = true;
437  }
438
439  // Parse an (optional) access specifier.
440  AccessSpecifier Access = getAccessSpecifierIfPresent();
441  if (Access)
442    ConsumeToken();
443
444  // Parse the 'virtual' keyword (again!), in case it came after the
445  // access specifier.
446  if (Tok.is(tok::kw_virtual))  {
447    SourceLocation VirtualLoc = ConsumeToken();
448    if (IsVirtual) {
449      // Complain about duplicate 'virtual'
450      Diag(VirtualLoc, diag::err_dup_virtual)
451        << SourceRange(VirtualLoc, VirtualLoc);
452    }
453
454    IsVirtual = true;
455  }
456
457  // Parse optional '::' and optional nested-name-specifier.
458  CXXScopeSpec SS;
459  ParseOptionalCXXScopeSpecifier(SS);
460
461  // The location of the base class itself.
462  SourceLocation BaseLoc = Tok.getLocation();
463
464  // Parse the class-name.
465  TypeTy *BaseType = ParseClassName(&SS);
466  if (!BaseType)
467    return true;
468
469  // Find the complete source range for the base-specifier.
470  SourceRange Range(StartLoc, BaseLoc);
471
472  // Notify semantic analysis that we have parsed a complete
473  // base-specifier.
474  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
475                                    BaseType, BaseLoc);
476}
477
478/// getAccessSpecifierIfPresent - Determine whether the next token is
479/// a C++ access-specifier.
480///
481///       access-specifier: [C++ class.derived]
482///         'private'
483///         'protected'
484///         'public'
485AccessSpecifier Parser::getAccessSpecifierIfPresent() const
486{
487  switch (Tok.getKind()) {
488  default: return AS_none;
489  case tok::kw_private: return AS_private;
490  case tok::kw_protected: return AS_protected;
491  case tok::kw_public: return AS_public;
492  }
493}
494
495/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
496///
497///       member-declaration:
498///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
499///         function-definition ';'[opt]
500///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
501///         using-declaration                                            [TODO]
502/// [C++0x] static_assert-declaration                                    [TODO]
503///         template-declaration                                         [TODO]
504/// [GNU]   '__extension__' member-declaration
505///
506///       member-declarator-list:
507///         member-declarator
508///         member-declarator-list ',' member-declarator
509///
510///       member-declarator:
511///         declarator pure-specifier[opt]
512///         declarator constant-initializer[opt]
513///         identifier[opt] ':' constant-expression
514///
515///       pure-specifier:   [TODO]
516///         '= 0'
517///
518///       constant-initializer:
519///         '=' constant-expression
520///
521Parser::DeclTy *Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS) {
522  // Handle:  member-declaration ::= '__extension__' member-declaration
523  if (Tok.is(tok::kw___extension__)) {
524    // __extension__ silences extension warnings in the subexpression.
525    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
526    ConsumeToken();
527    return ParseCXXClassMemberDeclaration(AS);
528  }
529
530  SourceLocation DSStart = Tok.getLocation();
531  // decl-specifier-seq:
532  // Parse the common declaration-specifiers piece.
533  DeclSpec DS;
534  ParseDeclarationSpecifiers(DS);
535
536  if (Tok.is(tok::semi)) {
537    ConsumeToken();
538    // C++ 9.2p7: The member-declarator-list can be omitted only after a
539    // class-specifier or an enum-specifier or in a friend declaration.
540    // FIXME: Friend declarations.
541    switch (DS.getTypeSpecType()) {
542      case DeclSpec::TST_struct:
543      case DeclSpec::TST_union:
544      case DeclSpec::TST_class:
545      case DeclSpec::TST_enum:
546        return Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
547      default:
548        Diag(DSStart, diag::err_no_declarators);
549        return 0;
550    }
551  }
552
553  Declarator DeclaratorInfo(DS, Declarator::MemberContext);
554
555  if (Tok.isNot(tok::colon)) {
556    // Parse the first declarator.
557    ParseDeclarator(DeclaratorInfo);
558    // Error parsing the declarator?
559    if (!DeclaratorInfo.hasName()) {
560      // If so, skip until the semi-colon or a }.
561      SkipUntil(tok::r_brace, true);
562      if (Tok.is(tok::semi))
563        ConsumeToken();
564      return 0;
565    }
566
567    // function-definition:
568    if (Tok.is(tok::l_brace)
569        || (DeclaratorInfo.isFunctionDeclarator() && Tok.is(tok::colon))) {
570      if (!DeclaratorInfo.isFunctionDeclarator()) {
571        Diag(Tok, diag::err_func_def_no_params);
572        ConsumeBrace();
573        SkipUntil(tok::r_brace, true);
574        return 0;
575      }
576
577      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
578        Diag(Tok, diag::err_function_declared_typedef);
579        // This recovery skips the entire function body. It would be nice
580        // to simply call ParseCXXInlineMethodDef() below, however Sema
581        // assumes the declarator represents a function, not a typedef.
582        ConsumeBrace();
583        SkipUntil(tok::r_brace, true);
584        return 0;
585      }
586
587      return ParseCXXInlineMethodDef(AS, DeclaratorInfo);
588    }
589  }
590
591  // member-declarator-list:
592  //   member-declarator
593  //   member-declarator-list ',' member-declarator
594
595  DeclTy *LastDeclInGroup = 0;
596  OwningExprResult BitfieldSize(Actions);
597  OwningExprResult Init(Actions);
598
599  while (1) {
600
601    // member-declarator:
602    //   declarator pure-specifier[opt]
603    //   declarator constant-initializer[opt]
604    //   identifier[opt] ':' constant-expression
605
606    if (Tok.is(tok::colon)) {
607      ConsumeToken();
608      BitfieldSize = ParseConstantExpression();
609      if (BitfieldSize.isInvalid())
610        SkipUntil(tok::comma, true, true);
611    }
612
613    // pure-specifier:
614    //   '= 0'
615    //
616    // constant-initializer:
617    //   '=' constant-expression
618
619    if (Tok.is(tok::equal)) {
620      ConsumeToken();
621      Init = ParseInitializer();
622      if (Init.isInvalid())
623        SkipUntil(tok::comma, true, true);
624    }
625
626    // If attributes exist after the declarator, parse them.
627    if (Tok.is(tok::kw___attribute))
628      DeclaratorInfo.AddAttributes(ParseAttributes());
629
630    // NOTE: If Sema is the Action module and declarator is an instance field,
631    // this call will *not* return the created decl; LastDeclInGroup will be
632    // returned instead.
633    // See Sema::ActOnCXXMemberDeclarator for details.
634    LastDeclInGroup = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
635                                                       DeclaratorInfo,
636                                                       BitfieldSize.release(),
637                                                       Init.release(),
638                                                       LastDeclInGroup);
639
640    if (DeclaratorInfo.isFunctionDeclarator() &&
641        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
642          != DeclSpec::SCS_typedef) {
643      // We just declared a member function. If this member function
644      // has any default arguments, we'll need to parse them later.
645      LateParsedMethodDeclaration *LateMethod = 0;
646      DeclaratorChunk::FunctionTypeInfo &FTI
647        = DeclaratorInfo.getTypeObject(0).Fun;
648      for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
649        if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
650          if (!LateMethod) {
651            // Push this method onto the stack of late-parsed method
652            // declarations.
653            getCurTopClassStack().MethodDecls.push_back(
654                                   LateParsedMethodDeclaration(LastDeclInGroup));
655            LateMethod = &getCurTopClassStack().MethodDecls.back();
656
657            // Add all of the parameters prior to this one (they don't
658            // have default arguments).
659            LateMethod->DefaultArgs.reserve(FTI.NumArgs);
660            for (unsigned I = 0; I < ParamIdx; ++I)
661              LateMethod->DefaultArgs.push_back(
662                        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
663          }
664
665          // Add this parameter to the list of parameters (it or may
666          // not have a default argument).
667          LateMethod->DefaultArgs.push_back(
668            LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
669                                      FTI.ArgInfo[ParamIdx].DefaultArgTokens));
670        }
671      }
672    }
673
674    // If we don't have a comma, it is either the end of the list (a ';')
675    // or an error, bail out.
676    if (Tok.isNot(tok::comma))
677      break;
678
679    // Consume the comma.
680    ConsumeToken();
681
682    // Parse the next declarator.
683    DeclaratorInfo.clear();
684    BitfieldSize = 0;
685    Init = 0;
686
687    // Attributes are only allowed on the second declarator.
688    if (Tok.is(tok::kw___attribute))
689      DeclaratorInfo.AddAttributes(ParseAttributes());
690
691    if (Tok.isNot(tok::colon))
692      ParseDeclarator(DeclaratorInfo);
693  }
694
695  if (Tok.is(tok::semi)) {
696    ConsumeToken();
697    // Reverse the chain list.
698    return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
699  }
700
701  Diag(Tok, diag::err_expected_semi_decl_list);
702  // Skip to end of block or statement
703  SkipUntil(tok::r_brace, true, true);
704  if (Tok.is(tok::semi))
705    ConsumeToken();
706  return 0;
707}
708
709/// ParseCXXMemberSpecification - Parse the class definition.
710///
711///       member-specification:
712///         member-declaration member-specification[opt]
713///         access-specifier ':' member-specification[opt]
714///
715void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
716                                         unsigned TagType, DeclTy *TagDecl) {
717  assert((TagType == DeclSpec::TST_struct ||
718         TagType == DeclSpec::TST_union  ||
719         TagType == DeclSpec::TST_class) && "Invalid TagType!");
720
721  SourceLocation LBraceLoc = ConsumeBrace();
722
723  if (!CurScope->isCXXClassScope() && // Not about to define a nested class.
724      CurScope->isInCXXInlineMethodScope()) {
725    // We will define a local class of an inline method.
726    // Push a new LexedMethodsForTopClass for its inline methods.
727    PushTopClassStack();
728  }
729
730  // Enter a scope for the class.
731  ParseScope ClassScope(this, Scope::CXXClassScope|Scope::DeclScope);
732
733  Actions.ActOnStartCXXClassDef(CurScope, TagDecl, LBraceLoc);
734
735  // C++ 11p3: Members of a class defined with the keyword class are private
736  // by default. Members of a class defined with the keywords struct or union
737  // are public by default.
738  AccessSpecifier CurAS;
739  if (TagType == DeclSpec::TST_class)
740    CurAS = AS_private;
741  else
742    CurAS = AS_public;
743
744  // While we still have something to read, read the member-declarations.
745  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
746    // Each iteration of this loop reads one member-declaration.
747
748    // Check for extraneous top-level semicolon.
749    if (Tok.is(tok::semi)) {
750      Diag(Tok, diag::ext_extra_struct_semi);
751      ConsumeToken();
752      continue;
753    }
754
755    AccessSpecifier AS = getAccessSpecifierIfPresent();
756    if (AS != AS_none) {
757      // Current token is a C++ access specifier.
758      CurAS = AS;
759      ConsumeToken();
760      ExpectAndConsume(tok::colon, diag::err_expected_colon);
761      continue;
762    }
763
764    // Parse all the comma separated declarators.
765    ParseCXXClassMemberDeclaration(CurAS);
766  }
767
768  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
769
770  AttributeList *AttrList = 0;
771  // If attributes exist after class contents, parse them.
772  if (Tok.is(tok::kw___attribute))
773    AttrList = ParseAttributes(); // FIXME: where should I put them?
774
775  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
776                                            LBraceLoc, RBraceLoc);
777
778  // C++ 9.2p2: Within the class member-specification, the class is regarded as
779  // complete within function bodies, default arguments,
780  // exception-specifications, and constructor ctor-initializers (including
781  // such things in nested classes).
782  //
783  // FIXME: Only function bodies and constructor ctor-initializers are
784  // parsed correctly, fix the rest.
785  if (!CurScope->getParent()->isCXXClassScope()) {
786    // We are not inside a nested class. This class and its nested classes
787    // are complete and we can parse the delayed portions of method
788    // declarations and the lexed inline method definitions.
789    ParseLexedMethodDeclarations();
790    ParseLexedMethodDefs();
791
792    // For a local class of inline method, pop the LexedMethodsForTopClass that
793    // was previously pushed.
794
795    assert((CurScope->isInCXXInlineMethodScope() ||
796           TopClassStacks.size() == 1) &&
797           "MethodLexers not getting popped properly!");
798    if (CurScope->isInCXXInlineMethodScope())
799      PopTopClassStack();
800  }
801
802  // Leave the class scope.
803  ClassScope.Exit();
804
805  Actions.ActOnFinishCXXClassDef(TagDecl);
806}
807
808/// ParseConstructorInitializer - Parse a C++ constructor initializer,
809/// which explicitly initializes the members or base classes of a
810/// class (C++ [class.base.init]). For example, the three initializers
811/// after the ':' in the Derived constructor below:
812///
813/// @code
814/// class Base { };
815/// class Derived : Base {
816///   int x;
817///   float f;
818/// public:
819///   Derived(float f) : Base(), x(17), f(f) { }
820/// };
821/// @endcode
822///
823/// [C++]  ctor-initializer:
824///          ':' mem-initializer-list
825///
826/// [C++]  mem-initializer-list:
827///          mem-initializer
828///          mem-initializer , mem-initializer-list
829void Parser::ParseConstructorInitializer(DeclTy *ConstructorDecl) {
830  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
831
832  SourceLocation ColonLoc = ConsumeToken();
833
834  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
835
836  do {
837    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
838    if (!MemInit.isInvalid)
839      MemInitializers.push_back(MemInit.Val);
840
841    if (Tok.is(tok::comma))
842      ConsumeToken();
843    else if (Tok.is(tok::l_brace))
844      break;
845    else {
846      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
847      SkipUntil(tok::l_brace, true, true);
848      break;
849    }
850  } while (true);
851
852  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
853                               &MemInitializers[0], MemInitializers.size());
854}
855
856/// ParseMemInitializer - Parse a C++ member initializer, which is
857/// part of a constructor initializer that explicitly initializes one
858/// member or base class (C++ [class.base.init]). See
859/// ParseConstructorInitializer for an example.
860///
861/// [C++] mem-initializer:
862///         mem-initializer-id '(' expression-list[opt] ')'
863///
864/// [C++] mem-initializer-id:
865///         '::'[opt] nested-name-specifier[opt] class-name
866///         identifier
867Parser::MemInitResult Parser::ParseMemInitializer(DeclTy *ConstructorDecl) {
868  // FIXME: parse '::'[opt] nested-name-specifier[opt]
869
870  if (Tok.isNot(tok::identifier)) {
871    Diag(Tok, diag::err_expected_member_or_base_name);
872    return true;
873  }
874
875  // Get the identifier. This may be a member name or a class name,
876  // but we'll let the semantic analysis determine which it is.
877  IdentifierInfo *II = Tok.getIdentifierInfo();
878  SourceLocation IdLoc = ConsumeToken();
879
880  // Parse the '('.
881  if (Tok.isNot(tok::l_paren)) {
882    Diag(Tok, diag::err_expected_lparen);
883    return true;
884  }
885  SourceLocation LParenLoc = ConsumeParen();
886
887  // Parse the optional expression-list.
888  ExprVector ArgExprs(Actions);
889  CommaLocsTy CommaLocs;
890  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
891    SkipUntil(tok::r_paren);
892    return true;
893  }
894
895  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
896
897  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, II, IdLoc,
898                                     LParenLoc, ArgExprs.take(),
899                                     ArgExprs.size(), &CommaLocs[0], RParenLoc);
900}
901
902/// ParseExceptionSpecification - Parse a C++ exception-specification
903/// (C++ [except.spec]).
904///
905///       exception-specification:
906///         'throw' '(' type-id-list [opt] ')'
907/// [MS]    'throw' '(' '...' ')'
908///
909///       type-id-list:
910///         type-id
911///         type-id-list ',' type-id
912///
913bool Parser::ParseExceptionSpecification() {
914  assert(Tok.is(tok::kw_throw) && "expected throw");
915
916  SourceLocation ThrowLoc = ConsumeToken();
917
918  if (!Tok.is(tok::l_paren)) {
919    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
920  }
921  SourceLocation LParenLoc = ConsumeParen();
922
923  // Parse throw(...), a Microsoft extension that means "this function
924  // can throw anything".
925  if (Tok.is(tok::ellipsis)) {
926    SourceLocation EllipsisLoc = ConsumeToken();
927    if (!getLang().Microsoft)
928      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
929    SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
930    return false;
931  }
932
933  // Parse the sequence of type-ids.
934  while (Tok.isNot(tok::r_paren)) {
935    ParseTypeName();
936    if (Tok.is(tok::comma))
937      ConsumeToken();
938    else
939      break;
940  }
941
942  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
943  return false;
944}
945