ParseDeclCXX.cpp revision ab197baec16bacade82325fb274cf6b992ac5d8a 
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/Parse/ParseDiagnostic.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.getTypeName(*Tok.getIdentifierInfo(),
236                                     Tok.getLocation(), CurScope, SS);
237  if (!Type) {
238    Diag(Tok, diag::err_expected_class_name);
239    return 0;
240  }
241
242  // Consume the identifier.
243  ConsumeToken();
244
245  return Type;
246}
247
248/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
249/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
250/// until we reach the start of a definition or see a token that
251/// cannot start a definition.
252///
253///       class-specifier: [C++ class]
254///         class-head '{' member-specification[opt] '}'
255///         class-head '{' member-specification[opt] '}' attributes[opt]
256///       class-head:
257///         class-key identifier[opt] base-clause[opt]
258///         class-key nested-name-specifier identifier base-clause[opt]
259///         class-key nested-name-specifier[opt] simple-template-id
260///                          base-clause[opt]
261/// [GNU]   class-key attributes[opt] identifier[opt] base-clause[opt]
262/// [GNU]   class-key attributes[opt] nested-name-specifier
263///                          identifier base-clause[opt]
264/// [GNU]   class-key attributes[opt] nested-name-specifier[opt]
265///                          simple-template-id base-clause[opt]
266///       class-key:
267///         'class'
268///         'struct'
269///         'union'
270///
271///       elaborated-type-specifier: [C++ dcl.type.elab]
272///         class-key ::[opt] nested-name-specifier[opt] identifier
273///         class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
274///                          simple-template-id
275///
276///  Note that the C++ class-specifier and elaborated-type-specifier,
277///  together, subsume the C99 struct-or-union-specifier:
278///
279///       struct-or-union-specifier: [C99 6.7.2.1]
280///         struct-or-union identifier[opt] '{' struct-contents '}'
281///         struct-or-union identifier
282/// [GNU]   struct-or-union attributes[opt] identifier[opt] '{' struct-contents
283///                                                         '}' attributes[opt]
284/// [GNU]   struct-or-union attributes[opt] identifier
285///       struct-or-union:
286///         'struct'
287///         'union'
288void Parser::ParseClassSpecifier(DeclSpec &DS,
289                                 TemplateParameterLists *TemplateParams) {
290  assert((Tok.is(tok::kw_class) ||
291          Tok.is(tok::kw_struct) ||
292          Tok.is(tok::kw_union)) &&
293         "Not a class specifier");
294  DeclSpec::TST TagType =
295    Tok.is(tok::kw_class) ? DeclSpec::TST_class :
296    Tok.is(tok::kw_struct) ? DeclSpec::TST_struct :
297    DeclSpec::TST_union;
298
299  SourceLocation StartLoc = ConsumeToken();
300
301  AttributeList *Attr = 0;
302  // If attributes exist after tag, parse them.
303  if (Tok.is(tok::kw___attribute))
304    Attr = ParseAttributes();
305
306  // If declspecs exist after tag, parse them.
307  if (Tok.is(tok::kw___declspec) && PP.getLangOptions().Microsoft)
308    FuzzyParseMicrosoftDeclSpec();
309
310  // Parse the (optional) nested-name-specifier.
311  CXXScopeSpec SS;
312  if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS)) {
313    if (Tok.isNot(tok::identifier))
314      Diag(Tok, diag::err_expected_ident);
315  }
316
317  // Parse the (optional) class name.
318  // FIXME: Alternatively, parse a simple-template-id.
319  IdentifierInfo *Name = 0;
320  SourceLocation NameLoc;
321  if (Tok.is(tok::identifier)) {
322    Name = Tok.getIdentifierInfo();
323    NameLoc = ConsumeToken();
324  }
325
326  // There are three options here.  If we have 'struct foo;', then
327  // this is a forward declaration.  If we have 'struct foo {...' or
328  // 'struct fo :...' then this is a definition. Otherwise we have
329  // something like 'struct foo xyz', a reference.
330  Action::TagKind TK;
331  if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon)))
332    TK = Action::TK_Definition;
333  else if (Tok.is(tok::semi))
334    TK = Action::TK_Declaration;
335  else
336    TK = Action::TK_Reference;
337
338  if (!Name && TK != Action::TK_Definition) {
339    // We have a declaration or reference to an anonymous class.
340    Diag(StartLoc, diag::err_anon_type_definition)
341      << DeclSpec::getSpecifierName(TagType);
342
343    // Skip the rest of this declarator, up until the comma or semicolon.
344    SkipUntil(tok::comma, true);
345    return;
346  }
347
348  // Create the tag portion of the class or class template.
349  DeclTy *TagOrTempDecl;
350  if (TemplateParams && TK != Action::TK_Reference)
351    TagOrTempDecl = Actions.ActOnClassTemplate(CurScope, TagType, TK, StartLoc,
352                                               SS, Name, NameLoc, Attr,
353                       Action::MultiTemplateParamsArg(Actions,
354                                                      &(*TemplateParams)[0],
355                                                      TemplateParams->size()));
356  else
357    TagOrTempDecl = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, SS, Name,
358                                     NameLoc, Attr);
359
360  // Parse the optional base clause (C++ only).
361  if (getLang().CPlusPlus && Tok.is(tok::colon)) {
362    ParseBaseClause(TagOrTempDecl);
363  }
364
365  // If there is a body, parse it and inform the actions module.
366  if (Tok.is(tok::l_brace))
367    if (getLang().CPlusPlus)
368      ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempDecl);
369    else
370      ParseStructUnionBody(StartLoc, TagType, TagOrTempDecl);
371  else if (TK == Action::TK_Definition) {
372    // FIXME: Complain that we have a base-specifier list but no
373    // definition.
374    Diag(Tok, diag::err_expected_lbrace);
375  }
376
377  const char *PrevSpec = 0;
378  if (!TagOrTempDecl)
379    DS.SetTypeSpecError();
380  else if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, TagOrTempDecl))
381    Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
382}
383
384/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
385///
386///       base-clause : [C++ class.derived]
387///         ':' base-specifier-list
388///       base-specifier-list:
389///         base-specifier '...'[opt]
390///         base-specifier-list ',' base-specifier '...'[opt]
391void Parser::ParseBaseClause(DeclTy *ClassDecl)
392{
393  assert(Tok.is(tok::colon) && "Not a base clause");
394  ConsumeToken();
395
396  // Build up an array of parsed base specifiers.
397  llvm::SmallVector<BaseTy *, 8> BaseInfo;
398
399  while (true) {
400    // Parse a base-specifier.
401    BaseResult Result = ParseBaseSpecifier(ClassDecl);
402    if (Result.isInvalid()) {
403      // Skip the rest of this base specifier, up until the comma or
404      // opening brace.
405      SkipUntil(tok::comma, tok::l_brace, true, true);
406    } else {
407      // Add this to our array of base specifiers.
408      BaseInfo.push_back(Result.get());
409    }
410
411    // If the next token is a comma, consume it and keep reading
412    // base-specifiers.
413    if (Tok.isNot(tok::comma)) break;
414
415    // Consume the comma.
416    ConsumeToken();
417  }
418
419  // Attach the base specifiers
420  Actions.ActOnBaseSpecifiers(ClassDecl, &BaseInfo[0], BaseInfo.size());
421}
422
423/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
424/// one entry in the base class list of a class specifier, for example:
425///    class foo : public bar, virtual private baz {
426/// 'public bar' and 'virtual private baz' are each base-specifiers.
427///
428///       base-specifier: [C++ class.derived]
429///         ::[opt] nested-name-specifier[opt] class-name
430///         'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
431///                        class-name
432///         access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
433///                        class-name
434Parser::BaseResult Parser::ParseBaseSpecifier(DeclTy *ClassDecl)
435{
436  bool IsVirtual = false;
437  SourceLocation StartLoc = Tok.getLocation();
438
439  // Parse the 'virtual' keyword.
440  if (Tok.is(tok::kw_virtual))  {
441    ConsumeToken();
442    IsVirtual = true;
443  }
444
445  // Parse an (optional) access specifier.
446  AccessSpecifier Access = getAccessSpecifierIfPresent();
447  if (Access)
448    ConsumeToken();
449
450  // Parse the 'virtual' keyword (again!), in case it came after the
451  // access specifier.
452  if (Tok.is(tok::kw_virtual))  {
453    SourceLocation VirtualLoc = ConsumeToken();
454    if (IsVirtual) {
455      // Complain about duplicate 'virtual'
456      Diag(VirtualLoc, diag::err_dup_virtual)
457        << SourceRange(VirtualLoc, VirtualLoc);
458    }
459
460    IsVirtual = true;
461  }
462
463  // Parse optional '::' and optional nested-name-specifier.
464  CXXScopeSpec SS;
465  ParseOptionalCXXScopeSpecifier(SS);
466
467  // The location of the base class itself.
468  SourceLocation BaseLoc = Tok.getLocation();
469
470  // Parse the class-name.
471  TypeTy *BaseType = ParseClassName(&SS);
472  if (!BaseType)
473    return true;
474
475  // Find the complete source range for the base-specifier.
476  SourceRange Range(StartLoc, BaseLoc);
477
478  // Notify semantic analysis that we have parsed a complete
479  // base-specifier.
480  return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
481                                    BaseType, BaseLoc);
482}
483
484/// getAccessSpecifierIfPresent - Determine whether the next token is
485/// a C++ access-specifier.
486///
487///       access-specifier: [C++ class.derived]
488///         'private'
489///         'protected'
490///         'public'
491AccessSpecifier Parser::getAccessSpecifierIfPresent() const
492{
493  switch (Tok.getKind()) {
494  default: return AS_none;
495  case tok::kw_private: return AS_private;
496  case tok::kw_protected: return AS_protected;
497  case tok::kw_public: return AS_public;
498  }
499}
500
501/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
502///
503///       member-declaration:
504///         decl-specifier-seq[opt] member-declarator-list[opt] ';'
505///         function-definition ';'[opt]
506///         ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
507///         using-declaration                                            [TODO]
508/// [C++0x] static_assert-declaration                                    [TODO]
509///         template-declaration                                         [TODO]
510/// [GNU]   '__extension__' member-declaration
511///
512///       member-declarator-list:
513///         member-declarator
514///         member-declarator-list ',' member-declarator
515///
516///       member-declarator:
517///         declarator pure-specifier[opt]
518///         declarator constant-initializer[opt]
519///         identifier[opt] ':' constant-expression
520///
521///       pure-specifier:   [TODO]
522///         '= 0'
523///
524///       constant-initializer:
525///         '=' constant-expression
526///
527Parser::DeclTy *Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS) {
528  // Handle:  member-declaration ::= '__extension__' member-declaration
529  if (Tok.is(tok::kw___extension__)) {
530    // __extension__ silences extension warnings in the subexpression.
531    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
532    ConsumeToken();
533    return ParseCXXClassMemberDeclaration(AS);
534  }
535
536  SourceLocation DSStart = Tok.getLocation();
537  // decl-specifier-seq:
538  // Parse the common declaration-specifiers piece.
539  DeclSpec DS;
540  ParseDeclarationSpecifiers(DS);
541
542  if (Tok.is(tok::semi)) {
543    ConsumeToken();
544    // C++ 9.2p7: The member-declarator-list can be omitted only after a
545    // class-specifier or an enum-specifier or in a friend declaration.
546    // FIXME: Friend declarations.
547    switch (DS.getTypeSpecType()) {
548      case DeclSpec::TST_struct:
549      case DeclSpec::TST_union:
550      case DeclSpec::TST_class:
551      case DeclSpec::TST_enum:
552        return Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
553      default:
554        Diag(DSStart, diag::err_no_declarators);
555        return 0;
556    }
557  }
558
559  Declarator DeclaratorInfo(DS, Declarator::MemberContext);
560
561  if (Tok.isNot(tok::colon)) {
562    // Parse the first declarator.
563    ParseDeclarator(DeclaratorInfo);
564    // Error parsing the declarator?
565    if (!DeclaratorInfo.hasName()) {
566      // If so, skip until the semi-colon or a }.
567      SkipUntil(tok::r_brace, true);
568      if (Tok.is(tok::semi))
569        ConsumeToken();
570      return 0;
571    }
572
573    // function-definition:
574    if (Tok.is(tok::l_brace)
575        || (DeclaratorInfo.isFunctionDeclarator() && Tok.is(tok::colon))) {
576      if (!DeclaratorInfo.isFunctionDeclarator()) {
577        Diag(Tok, diag::err_func_def_no_params);
578        ConsumeBrace();
579        SkipUntil(tok::r_brace, true);
580        return 0;
581      }
582
583      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
584        Diag(Tok, diag::err_function_declared_typedef);
585        // This recovery skips the entire function body. It would be nice
586        // to simply call ParseCXXInlineMethodDef() below, however Sema
587        // assumes the declarator represents a function, not a typedef.
588        ConsumeBrace();
589        SkipUntil(tok::r_brace, true);
590        return 0;
591      }
592
593      return ParseCXXInlineMethodDef(AS, DeclaratorInfo);
594    }
595  }
596
597  // member-declarator-list:
598  //   member-declarator
599  //   member-declarator-list ',' member-declarator
600
601  DeclTy *LastDeclInGroup = 0;
602  OwningExprResult BitfieldSize(Actions);
603  OwningExprResult Init(Actions);
604
605  while (1) {
606
607    // member-declarator:
608    //   declarator pure-specifier[opt]
609    //   declarator constant-initializer[opt]
610    //   identifier[opt] ':' constant-expression
611
612    if (Tok.is(tok::colon)) {
613      ConsumeToken();
614      BitfieldSize = ParseConstantExpression();
615      if (BitfieldSize.isInvalid())
616        SkipUntil(tok::comma, true, true);
617    }
618
619    // pure-specifier:
620    //   '= 0'
621    //
622    // constant-initializer:
623    //   '=' constant-expression
624
625    if (Tok.is(tok::equal)) {
626      ConsumeToken();
627      Init = ParseInitializer();
628      if (Init.isInvalid())
629        SkipUntil(tok::comma, true, true);
630    }
631
632    // If attributes exist after the declarator, parse them.
633    if (Tok.is(tok::kw___attribute)) {
634      SourceLocation Loc;
635      AttributeList *AttrList = ParseAttributes(&Loc);
636      DeclaratorInfo.AddAttributes(AttrList, Loc);
637    }
638
639    // NOTE: If Sema is the Action module and declarator is an instance field,
640    // this call will *not* return the created decl; LastDeclInGroup will be
641    // returned instead.
642    // See Sema::ActOnCXXMemberDeclarator for details.
643    LastDeclInGroup = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
644                                                       DeclaratorInfo,
645                                                       BitfieldSize.release(),
646                                                       Init.release(),
647                                                       LastDeclInGroup);
648
649    if (DeclaratorInfo.isFunctionDeclarator() &&
650        DeclaratorInfo.getDeclSpec().getStorageClassSpec()
651          != DeclSpec::SCS_typedef) {
652      // We just declared a member function. If this member function
653      // has any default arguments, we'll need to parse them later.
654      LateParsedMethodDeclaration *LateMethod = 0;
655      DeclaratorChunk::FunctionTypeInfo &FTI
656        = DeclaratorInfo.getTypeObject(0).Fun;
657      for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
658        if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
659          if (!LateMethod) {
660            // Push this method onto the stack of late-parsed method
661            // declarations.
662            getCurTopClassStack().MethodDecls.push_back(
663                                   LateParsedMethodDeclaration(LastDeclInGroup));
664            LateMethod = &getCurTopClassStack().MethodDecls.back();
665
666            // Add all of the parameters prior to this one (they don't
667            // have default arguments).
668            LateMethod->DefaultArgs.reserve(FTI.NumArgs);
669            for (unsigned I = 0; I < ParamIdx; ++I)
670              LateMethod->DefaultArgs.push_back(
671                        LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param));
672          }
673
674          // Add this parameter to the list of parameters (it or may
675          // not have a default argument).
676          LateMethod->DefaultArgs.push_back(
677            LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
678                                      FTI.ArgInfo[ParamIdx].DefaultArgTokens));
679        }
680      }
681    }
682
683    // If we don't have a comma, it is either the end of the list (a ';')
684    // or an error, bail out.
685    if (Tok.isNot(tok::comma))
686      break;
687
688    // Consume the comma.
689    ConsumeToken();
690
691    // Parse the next declarator.
692    DeclaratorInfo.clear();
693    BitfieldSize = 0;
694    Init = 0;
695
696    // Attributes are only allowed on the second declarator.
697    if (Tok.is(tok::kw___attribute)) {
698      SourceLocation Loc;
699      AttributeList *AttrList = ParseAttributes(&Loc);
700      DeclaratorInfo.AddAttributes(AttrList, Loc);
701    }
702
703    if (Tok.isNot(tok::colon))
704      ParseDeclarator(DeclaratorInfo);
705  }
706
707  if (Tok.is(tok::semi)) {
708    ConsumeToken();
709    // Reverse the chain list.
710    return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
711  }
712
713  Diag(Tok, diag::err_expected_semi_decl_list);
714  // Skip to end of block or statement
715  SkipUntil(tok::r_brace, true, true);
716  if (Tok.is(tok::semi))
717    ConsumeToken();
718  return 0;
719}
720
721/// ParseCXXMemberSpecification - Parse the class definition.
722///
723///       member-specification:
724///         member-declaration member-specification[opt]
725///         access-specifier ':' member-specification[opt]
726///
727void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
728                                         unsigned TagType, DeclTy *TagDecl) {
729  assert((TagType == DeclSpec::TST_struct ||
730         TagType == DeclSpec::TST_union  ||
731         TagType == DeclSpec::TST_class) && "Invalid TagType!");
732
733  SourceLocation LBraceLoc = ConsumeBrace();
734
735  if (!CurScope->isClassScope() && // Not about to define a nested class.
736      CurScope->isInCXXInlineMethodScope()) {
737    // We will define a local class of an inline method.
738    // Push a new LexedMethodsForTopClass for its inline methods.
739    PushTopClassStack();
740  }
741
742  // Enter a scope for the class.
743  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
744
745  if (TagDecl)
746    Actions.ActOnTagStartDefinition(CurScope, TagDecl);
747  else {
748    SkipUntil(tok::r_brace, false, false);
749    return;
750  }
751
752  // C++ 11p3: Members of a class defined with the keyword class are private
753  // by default. Members of a class defined with the keywords struct or union
754  // are public by default.
755  AccessSpecifier CurAS;
756  if (TagType == DeclSpec::TST_class)
757    CurAS = AS_private;
758  else
759    CurAS = AS_public;
760
761  // While we still have something to read, read the member-declarations.
762  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
763    // Each iteration of this loop reads one member-declaration.
764
765    // Check for extraneous top-level semicolon.
766    if (Tok.is(tok::semi)) {
767      Diag(Tok, diag::ext_extra_struct_semi);
768      ConsumeToken();
769      continue;
770    }
771
772    AccessSpecifier AS = getAccessSpecifierIfPresent();
773    if (AS != AS_none) {
774      // Current token is a C++ access specifier.
775      CurAS = AS;
776      ConsumeToken();
777      ExpectAndConsume(tok::colon, diag::err_expected_colon);
778      continue;
779    }
780
781    // Parse all the comma separated declarators.
782    ParseCXXClassMemberDeclaration(CurAS);
783  }
784
785  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
786
787  AttributeList *AttrList = 0;
788  // If attributes exist after class contents, parse them.
789  if (Tok.is(tok::kw___attribute))
790    AttrList = ParseAttributes(); // FIXME: where should I put them?
791
792  Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
793                                            LBraceLoc, RBraceLoc);
794
795  // C++ 9.2p2: Within the class member-specification, the class is regarded as
796  // complete within function bodies, default arguments,
797  // exception-specifications, and constructor ctor-initializers (including
798  // such things in nested classes).
799  //
800  // FIXME: Only function bodies and constructor ctor-initializers are
801  // parsed correctly, fix the rest.
802  if (!CurScope->getParent()->isClassScope()) {
803    // We are not inside a nested class. This class and its nested classes
804    // are complete and we can parse the delayed portions of method
805    // declarations and the lexed inline method definitions.
806    ParseLexedMethodDeclarations();
807    ParseLexedMethodDefs();
808
809    // For a local class of inline method, pop the LexedMethodsForTopClass that
810    // was previously pushed.
811
812    assert((CurScope->isInCXXInlineMethodScope() ||
813           TopClassStacks.size() == 1) &&
814           "MethodLexers not getting popped properly!");
815    if (CurScope->isInCXXInlineMethodScope())
816      PopTopClassStack();
817  }
818
819  // Leave the class scope.
820  ClassScope.Exit();
821
822  Actions.ActOnTagFinishDefinition(CurScope, TagDecl);
823}
824
825/// ParseConstructorInitializer - Parse a C++ constructor initializer,
826/// which explicitly initializes the members or base classes of a
827/// class (C++ [class.base.init]). For example, the three initializers
828/// after the ':' in the Derived constructor below:
829///
830/// @code
831/// class Base { };
832/// class Derived : Base {
833///   int x;
834///   float f;
835/// public:
836///   Derived(float f) : Base(), x(17), f(f) { }
837/// };
838/// @endcode
839///
840/// [C++]  ctor-initializer:
841///          ':' mem-initializer-list
842///
843/// [C++]  mem-initializer-list:
844///          mem-initializer
845///          mem-initializer , mem-initializer-list
846void Parser::ParseConstructorInitializer(DeclTy *ConstructorDecl) {
847  assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
848
849  SourceLocation ColonLoc = ConsumeToken();
850
851  llvm::SmallVector<MemInitTy*, 4> MemInitializers;
852
853  do {
854    MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
855    if (!MemInit.isInvalid())
856      MemInitializers.push_back(MemInit.get());
857
858    if (Tok.is(tok::comma))
859      ConsumeToken();
860    else if (Tok.is(tok::l_brace))
861      break;
862    else {
863      // Skip over garbage, until we get to '{'.  Don't eat the '{'.
864      SkipUntil(tok::l_brace, true, true);
865      break;
866    }
867  } while (true);
868
869  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
870                               &MemInitializers[0], MemInitializers.size());
871}
872
873/// ParseMemInitializer - Parse a C++ member initializer, which is
874/// part of a constructor initializer that explicitly initializes one
875/// member or base class (C++ [class.base.init]). See
876/// ParseConstructorInitializer for an example.
877///
878/// [C++] mem-initializer:
879///         mem-initializer-id '(' expression-list[opt] ')'
880///
881/// [C++] mem-initializer-id:
882///         '::'[opt] nested-name-specifier[opt] class-name
883///         identifier
884Parser::MemInitResult Parser::ParseMemInitializer(DeclTy *ConstructorDecl) {
885  // FIXME: parse '::'[opt] nested-name-specifier[opt]
886
887  if (Tok.isNot(tok::identifier)) {
888    Diag(Tok, diag::err_expected_member_or_base_name);
889    return true;
890  }
891
892  // Get the identifier. This may be a member name or a class name,
893  // but we'll let the semantic analysis determine which it is.
894  IdentifierInfo *II = Tok.getIdentifierInfo();
895  SourceLocation IdLoc = ConsumeToken();
896
897  // Parse the '('.
898  if (Tok.isNot(tok::l_paren)) {
899    Diag(Tok, diag::err_expected_lparen);
900    return true;
901  }
902  SourceLocation LParenLoc = ConsumeParen();
903
904  // Parse the optional expression-list.
905  ExprVector ArgExprs(Actions);
906  CommaLocsTy CommaLocs;
907  if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
908    SkipUntil(tok::r_paren);
909    return true;
910  }
911
912  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
913
914  return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, II, IdLoc,
915                                     LParenLoc, ArgExprs.take(),
916                                     ArgExprs.size(), &CommaLocs[0], RParenLoc);
917}
918
919/// ParseExceptionSpecification - Parse a C++ exception-specification
920/// (C++ [except.spec]).
921///
922///       exception-specification:
923///         'throw' '(' type-id-list [opt] ')'
924/// [MS]    'throw' '(' '...' ')'
925///
926///       type-id-list:
927///         type-id
928///         type-id-list ',' type-id
929///
930bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc) {
931  assert(Tok.is(tok::kw_throw) && "expected throw");
932
933  SourceLocation ThrowLoc = ConsumeToken();
934
935  if (!Tok.is(tok::l_paren)) {
936    return Diag(Tok, diag::err_expected_lparen_after) << "throw";
937  }
938  SourceLocation LParenLoc = ConsumeParen();
939
940  // Parse throw(...), a Microsoft extension that means "this function
941  // can throw anything".
942  if (Tok.is(tok::ellipsis)) {
943    SourceLocation EllipsisLoc = ConsumeToken();
944    if (!getLang().Microsoft)
945      Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
946    EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
947    return false;
948  }
949
950  // Parse the sequence of type-ids.
951  while (Tok.isNot(tok::r_paren)) {
952    ParseTypeName();
953    if (Tok.is(tok::comma))
954      ConsumeToken();
955    else
956      break;
957  }
958
959  EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
960  return false;
961}
962