ParseDecl.cpp revision 82287d19ded35248c4ce6a425ce74116a13ce44e 
1//===--- ParseDecl.cpp - 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 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/Scope.h"
17#include "clang/Parse/Template.h"
18#include "RAIIObjectsForParser.h"
19#include "llvm/ADT/SmallSet.h"
20using namespace clang;
21
22//===----------------------------------------------------------------------===//
23// C99 6.7: Declarations.
24//===----------------------------------------------------------------------===//
25
26/// ParseTypeName
27///       type-name: [C99 6.7.6]
28///         specifier-qualifier-list abstract-declarator[opt]
29///
30/// Called type-id in C++.
31Action::TypeResult Parser::ParseTypeName(SourceRange *Range) {
32  // Parse the common declaration-specifiers piece.
33  DeclSpec DS;
34  ParseSpecifierQualifierList(DS);
35
36  // Parse the abstract-declarator, if present.
37  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
38  ParseDeclarator(DeclaratorInfo);
39  if (Range)
40    *Range = DeclaratorInfo.getSourceRange();
41
42  if (DeclaratorInfo.isInvalidType())
43    return true;
44
45  return Actions.ActOnTypeName(CurScope, DeclaratorInfo);
46}
47
48/// ParseGNUAttributes - Parse a non-empty attributes list.
49///
50/// [GNU] attributes:
51///         attribute
52///         attributes attribute
53///
54/// [GNU]  attribute:
55///          '__attribute__' '(' '(' attribute-list ')' ')'
56///
57/// [GNU]  attribute-list:
58///          attrib
59///          attribute_list ',' attrib
60///
61/// [GNU]  attrib:
62///          empty
63///          attrib-name
64///          attrib-name '(' identifier ')'
65///          attrib-name '(' identifier ',' nonempty-expr-list ')'
66///          attrib-name '(' argument-expression-list [C99 6.5.2] ')'
67///
68/// [GNU]  attrib-name:
69///          identifier
70///          typespec
71///          typequal
72///          storageclass
73///
74/// FIXME: The GCC grammar/code for this construct implies we need two
75/// token lookahead. Comment from gcc: "If they start with an identifier
76/// which is followed by a comma or close parenthesis, then the arguments
77/// start with that identifier; otherwise they are an expression list."
78///
79/// At the moment, I am not doing 2 token lookahead. I am also unaware of
80/// any attributes that don't work (based on my limited testing). Most
81/// attributes are very simple in practice. Until we find a bug, I don't see
82/// a pressing need to implement the 2 token lookahead.
83
84AttributeList *Parser::ParseGNUAttributes(SourceLocation *EndLoc) {
85  assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!");
86
87  AttributeList *CurrAttr = 0;
88
89  while (Tok.is(tok::kw___attribute)) {
90    ConsumeToken();
91    if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
92                         "attribute")) {
93      SkipUntil(tok::r_paren, true); // skip until ) or ;
94      return CurrAttr;
95    }
96    if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
97      SkipUntil(tok::r_paren, true); // skip until ) or ;
98      return CurrAttr;
99    }
100    // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
101    while (Tok.is(tok::identifier) || isDeclarationSpecifier() ||
102           Tok.is(tok::comma)) {
103
104      if (Tok.is(tok::comma)) {
105        // allows for empty/non-empty attributes. ((__vector_size__(16),,,,))
106        ConsumeToken();
107        continue;
108      }
109      // we have an identifier or declaration specifier (const, int, etc.)
110      IdentifierInfo *AttrName = Tok.getIdentifierInfo();
111      SourceLocation AttrNameLoc = ConsumeToken();
112
113      // check if we have a "paramterized" attribute
114      if (Tok.is(tok::l_paren)) {
115        ConsumeParen(); // ignore the left paren loc for now
116
117        if (Tok.is(tok::identifier)) {
118          IdentifierInfo *ParmName = Tok.getIdentifierInfo();
119          SourceLocation ParmLoc = ConsumeToken();
120
121          if (Tok.is(tok::r_paren)) {
122            // __attribute__(( mode(byte) ))
123            ConsumeParen(); // ignore the right paren loc for now
124            CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc,
125                                         ParmName, ParmLoc, 0, 0, CurrAttr);
126          } else if (Tok.is(tok::comma)) {
127            ConsumeToken();
128            // __attribute__(( format(printf, 1, 2) ))
129            ExprVector ArgExprs(Actions);
130            bool ArgExprsOk = true;
131
132            // now parse the non-empty comma separated list of expressions
133            while (1) {
134              OwningExprResult ArgExpr(ParseAssignmentExpression());
135              if (ArgExpr.isInvalid()) {
136                ArgExprsOk = false;
137                SkipUntil(tok::r_paren);
138                break;
139              } else {
140                ArgExprs.push_back(ArgExpr.release());
141              }
142              if (Tok.isNot(tok::comma))
143                break;
144              ConsumeToken(); // Eat the comma, move to the next argument
145            }
146            if (ArgExprsOk && Tok.is(tok::r_paren)) {
147              ConsumeParen(); // ignore the right paren loc for now
148              CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0,
149                                           AttrNameLoc, ParmName, ParmLoc,
150                                           ArgExprs.take(), ArgExprs.size(),
151                                           CurrAttr);
152            }
153          }
154        } else { // not an identifier
155          switch (Tok.getKind()) {
156          case tok::r_paren:
157          // parse a possibly empty comma separated list of expressions
158            // __attribute__(( nonnull() ))
159            ConsumeParen(); // ignore the right paren loc for now
160            CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc,
161                                         0, SourceLocation(), 0, 0, CurrAttr);
162            break;
163          case tok::kw_char:
164          case tok::kw_wchar_t:
165          case tok::kw_char16_t:
166          case tok::kw_char32_t:
167          case tok::kw_bool:
168          case tok::kw_short:
169          case tok::kw_int:
170          case tok::kw_long:
171          case tok::kw_signed:
172          case tok::kw_unsigned:
173          case tok::kw_float:
174          case tok::kw_double:
175          case tok::kw_void:
176          case tok::kw_typeof:
177            // If it's a builtin type name, eat it and expect a rparen
178            // __attribute__(( vec_type_hint(char) ))
179            ConsumeToken();
180            CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc,
181                                         0, SourceLocation(), 0, 0, CurrAttr);
182            if (Tok.is(tok::r_paren))
183              ConsumeParen();
184            break;
185          default:
186            // __attribute__(( aligned(16) ))
187            ExprVector ArgExprs(Actions);
188            bool ArgExprsOk = true;
189
190            // now parse the list of expressions
191            while (1) {
192              OwningExprResult ArgExpr(ParseAssignmentExpression());
193              if (ArgExpr.isInvalid()) {
194                ArgExprsOk = false;
195                SkipUntil(tok::r_paren);
196                break;
197              } else {
198                ArgExprs.push_back(ArgExpr.release());
199              }
200              if (Tok.isNot(tok::comma))
201                break;
202              ConsumeToken(); // Eat the comma, move to the next argument
203            }
204            // Match the ')'.
205            if (ArgExprsOk && Tok.is(tok::r_paren)) {
206              ConsumeParen(); // ignore the right paren loc for now
207              CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0,
208                           AttrNameLoc, 0, SourceLocation(), ArgExprs.take(),
209                           ArgExprs.size(),
210                           CurrAttr);
211            }
212            break;
213          }
214        }
215      } else {
216        CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc,
217                                     0, SourceLocation(), 0, 0, CurrAttr);
218      }
219    }
220    if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
221      SkipUntil(tok::r_paren, false);
222    SourceLocation Loc = Tok.getLocation();
223    if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen)) {
224      SkipUntil(tok::r_paren, false);
225    }
226    if (EndLoc)
227      *EndLoc = Loc;
228  }
229  return CurrAttr;
230}
231
232/// ParseMicrosoftDeclSpec - Parse an __declspec construct
233///
234/// [MS] decl-specifier:
235///             __declspec ( extended-decl-modifier-seq )
236///
237/// [MS] extended-decl-modifier-seq:
238///             extended-decl-modifier[opt]
239///             extended-decl-modifier extended-decl-modifier-seq
240
241AttributeList* Parser::ParseMicrosoftDeclSpec(AttributeList *CurrAttr) {
242  assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
243
244  ConsumeToken();
245  if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
246                       "declspec")) {
247    SkipUntil(tok::r_paren, true); // skip until ) or ;
248    return CurrAttr;
249  }
250  while (Tok.getIdentifierInfo()) {
251    IdentifierInfo *AttrName = Tok.getIdentifierInfo();
252    SourceLocation AttrNameLoc = ConsumeToken();
253    if (Tok.is(tok::l_paren)) {
254      ConsumeParen();
255      // FIXME: This doesn't parse __declspec(property(get=get_func_name))
256      // correctly.
257      OwningExprResult ArgExpr(ParseAssignmentExpression());
258      if (!ArgExpr.isInvalid()) {
259        ExprTy* ExprList = ArgExpr.take();
260        CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc, 0,
261                                     SourceLocation(), &ExprList, 1,
262                                     CurrAttr, true);
263      }
264      if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
265        SkipUntil(tok::r_paren, false);
266    } else {
267      CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc,
268                                   0, SourceLocation(), 0, 0, CurrAttr, true);
269    }
270  }
271  if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
272    SkipUntil(tok::r_paren, false);
273  return CurrAttr;
274}
275
276AttributeList* Parser::ParseMicrosoftTypeAttributes(AttributeList *CurrAttr) {
277  // Treat these like attributes
278  // FIXME: Allow Sema to distinguish between these and real attributes!
279  while (Tok.is(tok::kw___fastcall) || Tok.is(tok::kw___stdcall) ||
280         Tok.is(tok::kw___cdecl)    || Tok.is(tok::kw___ptr64) ||
281         Tok.is(tok::kw___w64)) {
282    IdentifierInfo *AttrName = Tok.getIdentifierInfo();
283    SourceLocation AttrNameLoc = ConsumeToken();
284    if (Tok.is(tok::kw___ptr64) || Tok.is(tok::kw___w64))
285      // FIXME: Support these properly!
286      continue;
287    CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, AttrNameLoc, 0,
288                                 SourceLocation(), 0, 0, CurrAttr, true);
289  }
290  return CurrAttr;
291}
292
293/// ParseDeclaration - Parse a full 'declaration', which consists of
294/// declaration-specifiers, some number of declarators, and a semicolon.
295/// 'Context' should be a Declarator::TheContext value.  This returns the
296/// location of the semicolon in DeclEnd.
297///
298///       declaration: [C99 6.7]
299///         block-declaration ->
300///           simple-declaration
301///           others                   [FIXME]
302/// [C++]   template-declaration
303/// [C++]   namespace-definition
304/// [C++]   using-directive
305/// [C++]   using-declaration
306/// [C++0x] static_assert-declaration
307///         others... [FIXME]
308///
309Parser::DeclGroupPtrTy Parser::ParseDeclaration(unsigned Context,
310                                                SourceLocation &DeclEnd,
311                                                CXX0XAttributeList Attr) {
312  DeclPtrTy SingleDecl;
313  switch (Tok.getKind()) {
314  case tok::kw_template:
315  case tok::kw_export:
316    if (Attr.HasAttr)
317      Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
318        << Attr.Range;
319    SingleDecl = ParseDeclarationStartingWithTemplate(Context, DeclEnd);
320    break;
321  case tok::kw_namespace:
322    if (Attr.HasAttr)
323      Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
324        << Attr.Range;
325    SingleDecl = ParseNamespace(Context, DeclEnd);
326    break;
327  case tok::kw_using:
328    SingleDecl = ParseUsingDirectiveOrDeclaration(Context, DeclEnd, Attr);
329    break;
330  case tok::kw_static_assert:
331    if (Attr.HasAttr)
332      Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
333        << Attr.Range;
334    SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
335    break;
336  default:
337    return ParseSimpleDeclaration(Context, DeclEnd, Attr.AttrList);
338  }
339
340  // This routine returns a DeclGroup, if the thing we parsed only contains a
341  // single decl, convert it now.
342  return Actions.ConvertDeclToDeclGroup(SingleDecl);
343}
344
345///       simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
346///         declaration-specifiers init-declarator-list[opt] ';'
347///[C90/C++]init-declarator-list ';'                             [TODO]
348/// [OMP]   threadprivate-directive                              [TODO]
349///
350/// If RequireSemi is false, this does not check for a ';' at the end of the
351/// declaration.
352Parser::DeclGroupPtrTy Parser::ParseSimpleDeclaration(unsigned Context,
353                                                      SourceLocation &DeclEnd,
354                                                      AttributeList *Attr) {
355  // Parse the common declaration-specifiers piece.
356  ParsingDeclSpec DS(*this);
357  if (Attr)
358    DS.AddAttributes(Attr);
359  ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
360                            getDeclSpecContextFromDeclaratorContext(Context));
361
362  // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
363  // declaration-specifiers init-declarator-list[opt] ';'
364  if (Tok.is(tok::semi)) {
365    ConsumeToken();
366    DeclPtrTy TheDecl = Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
367    DS.complete(TheDecl);
368    return Actions.ConvertDeclToDeclGroup(TheDecl);
369  }
370
371  DeclGroupPtrTy DG = ParseDeclGroup(DS, Context, /*FunctionDefs=*/ false,
372                                     &DeclEnd);
373  return DG;
374}
375
376/// ParseDeclGroup - Having concluded that this is either a function
377/// definition or a group of object declarations, actually parse the
378/// result.
379Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS,
380                                              unsigned Context,
381                                              bool AllowFunctionDefinitions,
382                                              SourceLocation *DeclEnd) {
383  // Parse the first declarator.
384  ParsingDeclarator D(*this, DS, static_cast<Declarator::TheContext>(Context));
385  ParseDeclarator(D);
386
387  // Bail out if the first declarator didn't seem well-formed.
388  if (!D.hasName() && !D.mayOmitIdentifier()) {
389    // Skip until ; or }.
390    SkipUntil(tok::r_brace, true, true);
391    if (Tok.is(tok::semi))
392      ConsumeToken();
393    return DeclGroupPtrTy();
394  }
395
396  if (AllowFunctionDefinitions && D.isFunctionDeclarator()) {
397    if (isDeclarationAfterDeclarator()) {
398      // Fall though.  We have to check this first, though, because
399      // __attribute__ might be the start of a function definition in
400      // (extended) K&R C.
401    } else if (isStartOfFunctionDefinition()) {
402      if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
403        Diag(Tok, diag::err_function_declared_typedef);
404
405        // Recover by treating the 'typedef' as spurious.
406        DS.ClearStorageClassSpecs();
407      }
408
409      DeclPtrTy TheDecl = ParseFunctionDefinition(D);
410      return Actions.ConvertDeclToDeclGroup(TheDecl);
411    } else {
412      Diag(Tok, diag::err_expected_fn_body);
413      SkipUntil(tok::semi);
414      return DeclGroupPtrTy();
415    }
416  }
417
418  llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
419  DeclPtrTy FirstDecl = ParseDeclarationAfterDeclarator(D);
420  D.complete(FirstDecl);
421  if (FirstDecl.get())
422    DeclsInGroup.push_back(FirstDecl);
423
424  // If we don't have a comma, it is either the end of the list (a ';') or an
425  // error, bail out.
426  while (Tok.is(tok::comma)) {
427    // Consume the comma.
428    ConsumeToken();
429
430    // Parse the next declarator.
431    D.clear();
432
433    // Accept attributes in an init-declarator.  In the first declarator in a
434    // declaration, these would be part of the declspec.  In subsequent
435    // declarators, they become part of the declarator itself, so that they
436    // don't apply to declarators after *this* one.  Examples:
437    //    short __attribute__((common)) var;    -> declspec
438    //    short var __attribute__((common));    -> declarator
439    //    short x, __attribute__((common)) var;    -> declarator
440    if (Tok.is(tok::kw___attribute)) {
441      SourceLocation Loc;
442      AttributeList *AttrList = ParseGNUAttributes(&Loc);
443      D.AddAttributes(AttrList, Loc);
444    }
445
446    ParseDeclarator(D);
447
448    DeclPtrTy ThisDecl = ParseDeclarationAfterDeclarator(D);
449    D.complete(ThisDecl);
450    if (ThisDecl.get())
451      DeclsInGroup.push_back(ThisDecl);
452  }
453
454  if (DeclEnd)
455    *DeclEnd = Tok.getLocation();
456
457  if (Context != Declarator::ForContext &&
458      ExpectAndConsume(tok::semi,
459                       Context == Declarator::FileContext
460                         ? diag::err_invalid_token_after_toplevel_declarator
461                         : diag::err_expected_semi_declaration)) {
462    SkipUntil(tok::r_brace, true, true);
463    if (Tok.is(tok::semi))
464      ConsumeToken();
465  }
466
467  return Actions.FinalizeDeclaratorGroup(CurScope, DS,
468                                         DeclsInGroup.data(),
469                                         DeclsInGroup.size());
470}
471
472/// \brief Parse 'declaration' after parsing 'declaration-specifiers
473/// declarator'. This method parses the remainder of the declaration
474/// (including any attributes or initializer, among other things) and
475/// finalizes the declaration.
476///
477///       init-declarator: [C99 6.7]
478///         declarator
479///         declarator '=' initializer
480/// [GNU]   declarator simple-asm-expr[opt] attributes[opt]
481/// [GNU]   declarator simple-asm-expr[opt] attributes[opt] '=' initializer
482/// [C++]   declarator initializer[opt]
483///
484/// [C++] initializer:
485/// [C++]   '=' initializer-clause
486/// [C++]   '(' expression-list ')'
487/// [C++0x] '=' 'default'                                                [TODO]
488/// [C++0x] '=' 'delete'
489///
490/// According to the standard grammar, =default and =delete are function
491/// definitions, but that definitely doesn't fit with the parser here.
492///
493Parser::DeclPtrTy Parser::ParseDeclarationAfterDeclarator(Declarator &D,
494                                     const ParsedTemplateInfo &TemplateInfo) {
495  // If a simple-asm-expr is present, parse it.
496  if (Tok.is(tok::kw_asm)) {
497    SourceLocation Loc;
498    OwningExprResult AsmLabel(ParseSimpleAsm(&Loc));
499    if (AsmLabel.isInvalid()) {
500      SkipUntil(tok::semi, true, true);
501      return DeclPtrTy();
502    }
503
504    D.setAsmLabel(AsmLabel.release());
505    D.SetRangeEnd(Loc);
506  }
507
508  // If attributes are present, parse them.
509  if (Tok.is(tok::kw___attribute)) {
510    SourceLocation Loc;
511    AttributeList *AttrList = ParseGNUAttributes(&Loc);
512    D.AddAttributes(AttrList, Loc);
513  }
514
515  // Inform the current actions module that we just parsed this declarator.
516  DeclPtrTy ThisDecl;
517  switch (TemplateInfo.Kind) {
518  case ParsedTemplateInfo::NonTemplate:
519    ThisDecl = Actions.ActOnDeclarator(CurScope, D);
520    break;
521
522  case ParsedTemplateInfo::Template:
523  case ParsedTemplateInfo::ExplicitSpecialization:
524    ThisDecl = Actions.ActOnTemplateDeclarator(CurScope,
525                             Action::MultiTemplateParamsArg(Actions,
526                                          TemplateInfo.TemplateParams->data(),
527                                          TemplateInfo.TemplateParams->size()),
528                                               D);
529    break;
530
531  case ParsedTemplateInfo::ExplicitInstantiation: {
532    Action::DeclResult ThisRes
533      = Actions.ActOnExplicitInstantiation(CurScope,
534                                           TemplateInfo.ExternLoc,
535                                           TemplateInfo.TemplateLoc,
536                                           D);
537    if (ThisRes.isInvalid()) {
538      SkipUntil(tok::semi, true, true);
539      return DeclPtrTy();
540    }
541
542    ThisDecl = ThisRes.get();
543    break;
544    }
545  }
546
547  // Parse declarator '=' initializer.
548  if (Tok.is(tok::equal)) {
549    ConsumeToken();
550    if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
551      SourceLocation DelLoc = ConsumeToken();
552      Actions.SetDeclDeleted(ThisDecl, DelLoc);
553    } else {
554      if (getLang().CPlusPlus && D.getCXXScopeSpec().isSet()) {
555        EnterScope(0);
556        Actions.ActOnCXXEnterDeclInitializer(CurScope, ThisDecl);
557      }
558
559      OwningExprResult Init(ParseInitializer());
560
561      if (getLang().CPlusPlus && D.getCXXScopeSpec().isSet()) {
562        Actions.ActOnCXXExitDeclInitializer(CurScope, ThisDecl);
563        ExitScope();
564      }
565
566      if (Init.isInvalid()) {
567        SkipUntil(tok::semi, true, true);
568        return DeclPtrTy();
569      }
570      Actions.AddInitializerToDecl(ThisDecl, move(Init));
571    }
572  } else if (Tok.is(tok::l_paren)) {
573    // Parse C++ direct initializer: '(' expression-list ')'
574    SourceLocation LParenLoc = ConsumeParen();
575    ExprVector Exprs(Actions);
576    CommaLocsTy CommaLocs;
577
578    if (getLang().CPlusPlus && D.getCXXScopeSpec().isSet()) {
579      EnterScope(0);
580      Actions.ActOnCXXEnterDeclInitializer(CurScope, ThisDecl);
581    }
582
583    if (ParseExpressionList(Exprs, CommaLocs)) {
584      SkipUntil(tok::r_paren);
585
586      if (getLang().CPlusPlus && D.getCXXScopeSpec().isSet()) {
587        Actions.ActOnCXXExitDeclInitializer(CurScope, ThisDecl);
588        ExitScope();
589      }
590    } else {
591      // Match the ')'.
592      SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
593
594      assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() &&
595             "Unexpected number of commas!");
596
597      if (getLang().CPlusPlus && D.getCXXScopeSpec().isSet()) {
598        Actions.ActOnCXXExitDeclInitializer(CurScope, ThisDecl);
599        ExitScope();
600      }
601
602      Actions.AddCXXDirectInitializerToDecl(ThisDecl, LParenLoc,
603                                            move_arg(Exprs),
604                                            CommaLocs.data(), RParenLoc);
605    }
606  } else {
607    bool TypeContainsUndeducedAuto =
608      D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto;
609    Actions.ActOnUninitializedDecl(ThisDecl, TypeContainsUndeducedAuto);
610  }
611
612  return ThisDecl;
613}
614
615/// ParseSpecifierQualifierList
616///        specifier-qualifier-list:
617///          type-specifier specifier-qualifier-list[opt]
618///          type-qualifier specifier-qualifier-list[opt]
619/// [GNU]    attributes     specifier-qualifier-list[opt]
620///
621void Parser::ParseSpecifierQualifierList(DeclSpec &DS) {
622  /// specifier-qualifier-list is a subset of declaration-specifiers.  Just
623  /// parse declaration-specifiers and complain about extra stuff.
624  ParseDeclarationSpecifiers(DS);
625
626  // Validate declspec for type-name.
627  unsigned Specs = DS.getParsedSpecifiers();
628  if (Specs == DeclSpec::PQ_None && !DS.getNumProtocolQualifiers() &&
629      !DS.getAttributes())
630    Diag(Tok, diag::err_typename_requires_specqual);
631
632  // Issue diagnostic and remove storage class if present.
633  if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
634    if (DS.getStorageClassSpecLoc().isValid())
635      Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
636    else
637      Diag(DS.getThreadSpecLoc(), diag::err_typename_invalid_storageclass);
638    DS.ClearStorageClassSpecs();
639  }
640
641  // Issue diagnostic and remove function specfier if present.
642  if (Specs & DeclSpec::PQ_FunctionSpecifier) {
643    if (DS.isInlineSpecified())
644      Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
645    if (DS.isVirtualSpecified())
646      Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec);
647    if (DS.isExplicitSpecified())
648      Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec);
649    DS.ClearFunctionSpecs();
650  }
651}
652
653/// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the
654/// specified token is valid after the identifier in a declarator which
655/// immediately follows the declspec.  For example, these things are valid:
656///
657///      int x   [             4];         // direct-declarator
658///      int x   (             int y);     // direct-declarator
659///  int(int x   )                         // direct-declarator
660///      int x   ;                         // simple-declaration
661///      int x   =             17;         // init-declarator-list
662///      int x   ,             y;          // init-declarator-list
663///      int x   __asm__       ("foo");    // init-declarator-list
664///      int x   :             4;          // struct-declarator
665///      int x   {             5};         // C++'0x unified initializers
666///
667/// This is not, because 'x' does not immediately follow the declspec (though
668/// ')' happens to be valid anyway).
669///    int (x)
670///
671static bool isValidAfterIdentifierInDeclarator(const Token &T) {
672  return T.is(tok::l_square) || T.is(tok::l_paren) || T.is(tok::r_paren) ||
673         T.is(tok::semi) || T.is(tok::comma) || T.is(tok::equal) ||
674         T.is(tok::kw_asm) || T.is(tok::l_brace) || T.is(tok::colon);
675}
676
677
678/// ParseImplicitInt - This method is called when we have an non-typename
679/// identifier in a declspec (which normally terminates the decl spec) when
680/// the declspec has no type specifier.  In this case, the declspec is either
681/// malformed or is "implicit int" (in K&R and C89).
682///
683/// This method handles diagnosing this prettily and returns false if the
684/// declspec is done being processed.  If it recovers and thinks there may be
685/// other pieces of declspec after it, it returns true.
686///
687bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
688                              const ParsedTemplateInfo &TemplateInfo,
689                              AccessSpecifier AS) {
690  assert(Tok.is(tok::identifier) && "should have identifier");
691
692  SourceLocation Loc = Tok.getLocation();
693  // If we see an identifier that is not a type name, we normally would
694  // parse it as the identifer being declared.  However, when a typename
695  // is typo'd or the definition is not included, this will incorrectly
696  // parse the typename as the identifier name and fall over misparsing
697  // later parts of the diagnostic.
698  //
699  // As such, we try to do some look-ahead in cases where this would
700  // otherwise be an "implicit-int" case to see if this is invalid.  For
701  // example: "static foo_t x = 4;"  In this case, if we parsed foo_t as
702  // an identifier with implicit int, we'd get a parse error because the
703  // next token is obviously invalid for a type.  Parse these as a case
704  // with an invalid type specifier.
705  assert(!DS.hasTypeSpecifier() && "Type specifier checked above");
706
707  // Since we know that this either implicit int (which is rare) or an
708  // error, we'd do lookahead to try to do better recovery.
709  if (isValidAfterIdentifierInDeclarator(NextToken())) {
710    // If this token is valid for implicit int, e.g. "static x = 4", then
711    // we just avoid eating the identifier, so it will be parsed as the
712    // identifier in the declarator.
713    return false;
714  }
715
716  // Otherwise, if we don't consume this token, we are going to emit an
717  // error anyway.  Try to recover from various common problems.  Check
718  // to see if this was a reference to a tag name without a tag specified.
719  // This is a common problem in C (saying 'foo' instead of 'struct foo').
720  //
721  // C++ doesn't need this, and isTagName doesn't take SS.
722  if (SS == 0) {
723    const char *TagName = 0;
724    tok::TokenKind TagKind = tok::unknown;
725
726    switch (Actions.isTagName(*Tok.getIdentifierInfo(), CurScope)) {
727      default: break;
728      case DeclSpec::TST_enum:  TagName="enum"  ;TagKind=tok::kw_enum  ;break;
729      case DeclSpec::TST_union: TagName="union" ;TagKind=tok::kw_union ;break;
730      case DeclSpec::TST_struct:TagName="struct";TagKind=tok::kw_struct;break;
731      case DeclSpec::TST_class: TagName="class" ;TagKind=tok::kw_class ;break;
732    }
733
734    if (TagName) {
735      Diag(Loc, diag::err_use_of_tag_name_without_tag)
736        << Tok.getIdentifierInfo() << TagName
737        << CodeModificationHint::CreateInsertion(Tok.getLocation(),TagName);
738
739      // Parse this as a tag as if the missing tag were present.
740      if (TagKind == tok::kw_enum)
741        ParseEnumSpecifier(Loc, DS, AS);
742      else
743        ParseClassSpecifier(TagKind, Loc, DS, TemplateInfo, AS);
744      return true;
745    }
746  }
747
748  // This is almost certainly an invalid type name. Let the action emit a
749  // diagnostic and attempt to recover.
750  Action::TypeTy *T = 0;
751  if (Actions.DiagnoseUnknownTypeName(*Tok.getIdentifierInfo(), Loc,
752                                      CurScope, SS, T)) {
753    // The action emitted a diagnostic, so we don't have to.
754    if (T) {
755      // The action has suggested that the type T could be used. Set that as
756      // the type in the declaration specifiers, consume the would-be type
757      // name token, and we're done.
758      const char *PrevSpec;
759      unsigned DiagID;
760      DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
761                         false);
762      DS.SetRangeEnd(Tok.getLocation());
763      ConsumeToken();
764
765      // There may be other declaration specifiers after this.
766      return true;
767    }
768
769    // Fall through; the action had no suggestion for us.
770  } else {
771    // The action did not emit a diagnostic, so emit one now.
772    SourceRange R;
773    if (SS) R = SS->getRange();
774    Diag(Loc, diag::err_unknown_typename) << Tok.getIdentifierInfo() << R;
775  }
776
777  // Mark this as an error.
778  const char *PrevSpec;
779  unsigned DiagID;
780  DS.SetTypeSpecType(DeclSpec::TST_error, Loc, PrevSpec, DiagID);
781  DS.SetRangeEnd(Tok.getLocation());
782  ConsumeToken();
783
784  // TODO: Could inject an invalid typedef decl in an enclosing scope to
785  // avoid rippling error messages on subsequent uses of the same type,
786  // could be useful if #include was forgotten.
787  return false;
788}
789
790/// \brief Determine the declaration specifier context from the declarator
791/// context.
792///
793/// \param Context the declarator context, which is one of the
794/// Declarator::TheContext enumerator values.
795Parser::DeclSpecContext
796Parser::getDeclSpecContextFromDeclaratorContext(unsigned Context) {
797  if (Context == Declarator::MemberContext)
798    return DSC_class;
799  if (Context == Declarator::FileContext)
800    return DSC_top_level;
801  return DSC_normal;
802}
803
804/// ParseDeclarationSpecifiers
805///       declaration-specifiers: [C99 6.7]
806///         storage-class-specifier declaration-specifiers[opt]
807///         type-specifier declaration-specifiers[opt]
808/// [C99]   function-specifier declaration-specifiers[opt]
809/// [GNU]   attributes declaration-specifiers[opt]
810///
811///       storage-class-specifier: [C99 6.7.1]
812///         'typedef'
813///         'extern'
814///         'static'
815///         'auto'
816///         'register'
817/// [C++]   'mutable'
818/// [GNU]   '__thread'
819///       function-specifier: [C99 6.7.4]
820/// [C99]   'inline'
821/// [C++]   'virtual'
822/// [C++]   'explicit'
823///       'friend': [C++ dcl.friend]
824///       'constexpr': [C++0x dcl.constexpr]
825
826///
827void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
828                                        const ParsedTemplateInfo &TemplateInfo,
829                                        AccessSpecifier AS,
830                                        DeclSpecContext DSContext) {
831  if (Tok.is(tok::code_completion)) {
832    Action::CodeCompletionContext CCC = Action::CCC_Namespace;
833    if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate)
834      CCC = DSContext == DSC_class? Action::CCC_MemberTemplate
835                                  : Action::CCC_Template;
836    else if (DSContext == DSC_class)
837      CCC = Action::CCC_Class;
838    else if (ObjCImpDecl)
839      CCC = Action::CCC_ObjCImplementation;
840
841    Actions.CodeCompleteOrdinaryName(CurScope, CCC);
842    ConsumeToken();
843  }
844
845  DS.SetRangeStart(Tok.getLocation());
846  while (1) {
847    bool isInvalid = false;
848    const char *PrevSpec = 0;
849    unsigned DiagID = 0;
850
851    SourceLocation Loc = Tok.getLocation();
852
853    switch (Tok.getKind()) {
854    default:
855    DoneWithDeclSpec:
856      // If this is not a declaration specifier token, we're done reading decl
857      // specifiers.  First verify that DeclSpec's are consistent.
858      DS.Finish(Diags, PP);
859      return;
860
861    case tok::coloncolon: // ::foo::bar
862      // Annotate C++ scope specifiers.  If we get one, loop.
863      if (TryAnnotateCXXScopeToken(true))
864        continue;
865      goto DoneWithDeclSpec;
866
867    case tok::annot_cxxscope: {
868      if (DS.hasTypeSpecifier())
869        goto DoneWithDeclSpec;
870
871      CXXScopeSpec SS;
872      SS.setScopeRep(Tok.getAnnotationValue());
873      SS.setRange(Tok.getAnnotationRange());
874
875      // We are looking for a qualified typename.
876      Token Next = NextToken();
877      if (Next.is(tok::annot_template_id) &&
878          static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue())
879            ->Kind == TNK_Type_template) {
880        // We have a qualified template-id, e.g., N::A<int>
881
882        // C++ [class.qual]p2:
883        //   In a lookup in which the constructor is an acceptable lookup
884        //   result and the nested-name-specifier nominates a class C:
885        //
886        //     - if the name specified after the
887        //       nested-name-specifier, when looked up in C, is the
888        //       injected-class-name of C (Clause 9), or
889        //
890        //     - if the name specified after the nested-name-specifier
891        //       is the same as the identifier or the
892        //       simple-template-id's template-name in the last
893        //       component of the nested-name-specifier,
894        //
895        //   the name is instead considered to name the constructor of
896        //   class C.
897        //
898        // Thus, if the template-name is actually the constructor
899        // name, then the code is ill-formed; this interpretation is
900        // reinforced by the NAD status of core issue 635.
901        TemplateIdAnnotation *TemplateId
902          = static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue());
903        if (DSContext == DSC_top_level && TemplateId->Name &&
904            Actions.isCurrentClassName(*TemplateId->Name, CurScope, &SS)) {
905          if (isConstructorDeclarator()) {
906            // The user meant this to be an out-of-line constructor
907            // definition, but template arguments are not allowed
908            // there.  Just allow this as a constructor; we'll
909            // complain about it later.
910            goto DoneWithDeclSpec;
911          }
912
913          // The user meant this to name a type, but it actually names
914          // a constructor with some extraneous template
915          // arguments. Complain, then parse it as a type as the user
916          // intended.
917          Diag(TemplateId->TemplateNameLoc,
918               diag::err_out_of_line_template_id_names_constructor)
919            << TemplateId->Name;
920        }
921
922        DS.getTypeSpecScope() = SS;
923        ConsumeToken(); // The C++ scope.
924        assert(Tok.is(tok::annot_template_id) &&
925               "ParseOptionalCXXScopeSpecifier not working");
926        AnnotateTemplateIdTokenAsType(&SS);
927        continue;
928      }
929
930      if (Next.is(tok::annot_typename)) {
931        DS.getTypeSpecScope() = SS;
932        ConsumeToken(); // The C++ scope.
933        if (Tok.getAnnotationValue())
934          isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc,
935                                         PrevSpec, DiagID,
936                                         Tok.getAnnotationValue());
937        else
938          DS.SetTypeSpecError();
939        DS.SetRangeEnd(Tok.getAnnotationEndLoc());
940        ConsumeToken(); // The typename
941      }
942
943      if (Next.isNot(tok::identifier))
944        goto DoneWithDeclSpec;
945
946      // If we're in a context where the identifier could be a class name,
947      // check whether this is a constructor declaration.
948      if (DSContext == DSC_top_level &&
949          Actions.isCurrentClassName(*Next.getIdentifierInfo(), CurScope,
950                                     &SS)) {
951        if (isConstructorDeclarator())
952          goto DoneWithDeclSpec;
953
954        // As noted in C++ [class.qual]p2 (cited above), when the name
955        // of the class is qualified in a context where it could name
956        // a constructor, its a constructor name. However, we've
957        // looked at the declarator, and the user probably meant this
958        // to be a type. Complain that it isn't supposed to be treated
959        // as a type, then proceed to parse it as a type.
960        Diag(Next.getLocation(), diag::err_out_of_line_type_names_constructor)
961          << Next.getIdentifierInfo();
962      }
963
964      TypeTy *TypeRep = Actions.getTypeName(*Next.getIdentifierInfo(),
965                                            Next.getLocation(), CurScope, &SS);
966
967      // If the referenced identifier is not a type, then this declspec is
968      // erroneous: We already checked about that it has no type specifier, and
969      // C++ doesn't have implicit int.  Diagnose it as a typo w.r.t. to the
970      // typename.
971      if (TypeRep == 0) {
972        ConsumeToken();   // Eat the scope spec so the identifier is current.
973        if (ParseImplicitInt(DS, &SS, TemplateInfo, AS)) continue;
974        goto DoneWithDeclSpec;
975      }
976
977      DS.getTypeSpecScope() = SS;
978      ConsumeToken(); // The C++ scope.
979
980      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
981                                     DiagID, TypeRep);
982      if (isInvalid)
983        break;
984
985      DS.SetRangeEnd(Tok.getLocation());
986      ConsumeToken(); // The typename.
987
988      continue;
989    }
990
991    case tok::annot_typename: {
992      if (Tok.getAnnotationValue())
993        isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
994                                       DiagID, Tok.getAnnotationValue());
995      else
996        DS.SetTypeSpecError();
997      DS.SetRangeEnd(Tok.getAnnotationEndLoc());
998      ConsumeToken(); // The typename
999
1000      // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
1001      // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
1002      // Objective-C interface.  If we don't have Objective-C or a '<', this is
1003      // just a normal reference to a typedef name.
1004      if (!Tok.is(tok::less) || !getLang().ObjC1)
1005        continue;
1006
1007      SourceLocation LAngleLoc, EndProtoLoc;
1008      llvm::SmallVector<DeclPtrTy, 8> ProtocolDecl;
1009      llvm::SmallVector<SourceLocation, 8> ProtocolLocs;
1010      ParseObjCProtocolReferences(ProtocolDecl, ProtocolLocs, false,
1011                                  LAngleLoc, EndProtoLoc);
1012      DS.setProtocolQualifiers(ProtocolDecl.data(), ProtocolDecl.size(),
1013                               ProtocolLocs.data(), LAngleLoc);
1014
1015      DS.SetRangeEnd(EndProtoLoc);
1016      continue;
1017    }
1018
1019      // typedef-name
1020    case tok::identifier: {
1021      // In C++, check to see if this is a scope specifier like foo::bar::, if
1022      // so handle it as such.  This is important for ctor parsing.
1023      if (getLang().CPlusPlus && TryAnnotateCXXScopeToken(true))
1024        continue;
1025
1026      // This identifier can only be a typedef name if we haven't already seen
1027      // a type-specifier.  Without this check we misparse:
1028      //  typedef int X; struct Y { short X; };  as 'short int'.
1029      if (DS.hasTypeSpecifier())
1030        goto DoneWithDeclSpec;
1031
1032      // Check for need to substitute AltiVec keyword tokens.
1033      if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid))
1034        break;
1035
1036      // It has to be available as a typedef too!
1037      TypeTy *TypeRep = Actions.getTypeName(*Tok.getIdentifierInfo(),
1038                                            Tok.getLocation(), CurScope);
1039
1040      // If this is not a typedef name, don't parse it as part of the declspec,
1041      // it must be an implicit int or an error.
1042      if (TypeRep == 0) {
1043        if (ParseImplicitInt(DS, 0, TemplateInfo, AS)) continue;
1044        goto DoneWithDeclSpec;
1045      }
1046
1047      // If we're in a context where the identifier could be a class name,
1048      // check whether this is a constructor declaration.
1049      if (getLang().CPlusPlus && DSContext == DSC_class &&
1050          Actions.isCurrentClassName(*Tok.getIdentifierInfo(), CurScope) &&
1051          isConstructorDeclarator())
1052        goto DoneWithDeclSpec;
1053
1054      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
1055                                     DiagID, TypeRep);
1056      if (isInvalid)
1057        break;
1058
1059      DS.SetRangeEnd(Tok.getLocation());
1060      ConsumeToken(); // The identifier
1061
1062      // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
1063      // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
1064      // Objective-C interface.  If we don't have Objective-C or a '<', this is
1065      // just a normal reference to a typedef name.
1066      if (!Tok.is(tok::less) || !getLang().ObjC1)
1067        continue;
1068
1069      SourceLocation LAngleLoc, EndProtoLoc;
1070      llvm::SmallVector<DeclPtrTy, 8> ProtocolDecl;
1071      llvm::SmallVector<SourceLocation, 8> ProtocolLocs;
1072      ParseObjCProtocolReferences(ProtocolDecl, ProtocolLocs, false,
1073                                  LAngleLoc, EndProtoLoc);
1074      DS.setProtocolQualifiers(ProtocolDecl.data(), ProtocolDecl.size(),
1075                               ProtocolLocs.data(), LAngleLoc);
1076
1077      DS.SetRangeEnd(EndProtoLoc);
1078
1079      // Need to support trailing type qualifiers (e.g. "id<p> const").
1080      // If a type specifier follows, it will be diagnosed elsewhere.
1081      continue;
1082    }
1083
1084      // type-name
1085    case tok::annot_template_id: {
1086      TemplateIdAnnotation *TemplateId
1087        = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1088      if (TemplateId->Kind != TNK_Type_template) {
1089        // This template-id does not refer to a type name, so we're
1090        // done with the type-specifiers.
1091        goto DoneWithDeclSpec;
1092      }
1093
1094      // If we're in a context where the template-id could be a
1095      // constructor name or specialization, check whether this is a
1096      // constructor declaration.
1097      if (getLang().CPlusPlus && DSContext == DSC_class &&
1098          Actions.isCurrentClassName(*TemplateId->Name, CurScope) &&
1099          isConstructorDeclarator())
1100        goto DoneWithDeclSpec;
1101
1102      // Turn the template-id annotation token into a type annotation
1103      // token, then try again to parse it as a type-specifier.
1104      AnnotateTemplateIdTokenAsType();
1105      continue;
1106    }
1107
1108    // GNU attributes support.
1109    case tok::kw___attribute:
1110      DS.AddAttributes(ParseGNUAttributes());
1111      continue;
1112
1113    // Microsoft declspec support.
1114    case tok::kw___declspec:
1115      DS.AddAttributes(ParseMicrosoftDeclSpec());
1116      continue;
1117
1118    // Microsoft single token adornments.
1119    case tok::kw___forceinline:
1120      // FIXME: Add handling here!
1121      break;
1122
1123    case tok::kw___ptr64:
1124    case tok::kw___w64:
1125    case tok::kw___cdecl:
1126    case tok::kw___stdcall:
1127    case tok::kw___fastcall:
1128      DS.AddAttributes(ParseMicrosoftTypeAttributes());
1129      continue;
1130
1131    // storage-class-specifier
1132    case tok::kw_typedef:
1133      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_typedef, Loc, PrevSpec,
1134                                         DiagID);
1135      break;
1136    case tok::kw_extern:
1137      if (DS.isThreadSpecified())
1138        Diag(Tok, diag::ext_thread_before) << "extern";
1139      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_extern, Loc, PrevSpec,
1140                                         DiagID);
1141      break;
1142    case tok::kw___private_extern__:
1143      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_private_extern, Loc,
1144                                         PrevSpec, DiagID);
1145      break;
1146    case tok::kw_static:
1147      if (DS.isThreadSpecified())
1148        Diag(Tok, diag::ext_thread_before) << "static";
1149      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_static, Loc, PrevSpec,
1150                                         DiagID);
1151      break;
1152    case tok::kw_auto:
1153      if (getLang().CPlusPlus0x)
1154        isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto, Loc, PrevSpec,
1155                                       DiagID);
1156      else
1157        isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_auto, Loc, PrevSpec,
1158                                           DiagID);
1159      break;
1160    case tok::kw_register:
1161      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_register, Loc, PrevSpec,
1162                                         DiagID);
1163      break;
1164    case tok::kw_mutable:
1165      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_mutable, Loc, PrevSpec,
1166                                         DiagID);
1167      break;
1168    case tok::kw___thread:
1169      isInvalid = DS.SetStorageClassSpecThread(Loc, PrevSpec, DiagID);
1170      break;
1171
1172    // function-specifier
1173    case tok::kw_inline:
1174      isInvalid = DS.SetFunctionSpecInline(Loc, PrevSpec, DiagID);
1175      break;
1176    case tok::kw_virtual:
1177      isInvalid = DS.SetFunctionSpecVirtual(Loc, PrevSpec, DiagID);
1178      break;
1179    case tok::kw_explicit:
1180      isInvalid = DS.SetFunctionSpecExplicit(Loc, PrevSpec, DiagID);
1181      break;
1182
1183    // friend
1184    case tok::kw_friend:
1185      if (DSContext == DSC_class)
1186        isInvalid = DS.SetFriendSpec(Loc, PrevSpec, DiagID);
1187      else {
1188        PrevSpec = ""; // not actually used by the diagnostic
1189        DiagID = diag::err_friend_invalid_in_context;
1190        isInvalid = true;
1191      }
1192      break;
1193
1194    // constexpr
1195    case tok::kw_constexpr:
1196      isInvalid = DS.SetConstexprSpec(Loc, PrevSpec, DiagID);
1197      break;
1198
1199    // type-specifier
1200    case tok::kw_short:
1201      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec,
1202                                      DiagID);
1203      break;
1204    case tok::kw_long:
1205      if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
1206        isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec,
1207                                        DiagID);
1208      else
1209        isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec,
1210                                        DiagID);
1211      break;
1212    case tok::kw_signed:
1213      isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec,
1214                                     DiagID);
1215      break;
1216    case tok::kw_unsigned:
1217      isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec,
1218                                     DiagID);
1219      break;
1220    case tok::kw__Complex:
1221      isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec,
1222                                        DiagID);
1223      break;
1224    case tok::kw__Imaginary:
1225      isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec,
1226                                        DiagID);
1227      break;
1228    case tok::kw_void:
1229      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec,
1230                                     DiagID);
1231      break;
1232    case tok::kw_char:
1233      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec,
1234                                     DiagID);
1235      break;
1236    case tok::kw_int:
1237      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec,
1238                                     DiagID);
1239      break;
1240    case tok::kw_float:
1241      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec,
1242                                     DiagID);
1243      break;
1244    case tok::kw_double:
1245      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec,
1246                                     DiagID);
1247      break;
1248    case tok::kw_wchar_t:
1249      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec,
1250                                     DiagID);
1251      break;
1252    case tok::kw_char16_t:
1253      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec,
1254                                     DiagID);
1255      break;
1256    case tok::kw_char32_t:
1257      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec,
1258                                     DiagID);
1259      break;
1260    case tok::kw_bool:
1261    case tok::kw__Bool:
1262      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec,
1263                                     DiagID);
1264      break;
1265    case tok::kw__Decimal32:
1266      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec,
1267                                     DiagID);
1268      break;
1269    case tok::kw__Decimal64:
1270      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec,
1271                                     DiagID);
1272      break;
1273    case tok::kw__Decimal128:
1274      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec,
1275                                     DiagID);
1276      break;
1277    case tok::kw___vector:
1278      isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID);
1279      break;
1280    case tok::kw___pixel:
1281      isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID);
1282      break;
1283
1284    // class-specifier:
1285    case tok::kw_class:
1286    case tok::kw_struct:
1287    case tok::kw_union: {
1288      tok::TokenKind Kind = Tok.getKind();
1289      ConsumeToken();
1290      ParseClassSpecifier(Kind, Loc, DS, TemplateInfo, AS);
1291      continue;
1292    }
1293
1294    // enum-specifier:
1295    case tok::kw_enum:
1296      ConsumeToken();
1297      ParseEnumSpecifier(Loc, DS, AS);
1298      continue;
1299
1300    // cv-qualifier:
1301    case tok::kw_const:
1302      isInvalid = DS.SetTypeQual(DeclSpec::TQ_const, Loc, PrevSpec, DiagID,
1303                                 getLang());
1304      break;
1305    case tok::kw_volatile:
1306      isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
1307                                 getLang());
1308      break;
1309    case tok::kw_restrict:
1310      isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
1311                                 getLang());
1312      break;
1313
1314    // C++ typename-specifier:
1315    case tok::kw_typename:
1316      if (TryAnnotateTypeOrScopeToken())
1317        continue;
1318      break;
1319
1320    // GNU typeof support.
1321    case tok::kw_typeof:
1322      ParseTypeofSpecifier(DS);
1323      continue;
1324
1325    case tok::kw_decltype:
1326      ParseDecltypeSpecifier(DS);
1327      continue;
1328
1329    case tok::less:
1330      // GCC ObjC supports types like "<SomeProtocol>" as a synonym for
1331      // "id<SomeProtocol>".  This is hopelessly old fashioned and dangerous,
1332      // but we support it.
1333      if (DS.hasTypeSpecifier() || !getLang().ObjC1)
1334        goto DoneWithDeclSpec;
1335
1336      {
1337        SourceLocation LAngleLoc, EndProtoLoc;
1338        llvm::SmallVector<DeclPtrTy, 8> ProtocolDecl;
1339        llvm::SmallVector<SourceLocation, 8> ProtocolLocs;
1340        ParseObjCProtocolReferences(ProtocolDecl, ProtocolLocs, false,
1341                                    LAngleLoc, EndProtoLoc);
1342        DS.setProtocolQualifiers(ProtocolDecl.data(), ProtocolDecl.size(),
1343                                 ProtocolLocs.data(), LAngleLoc);
1344        DS.SetRangeEnd(EndProtoLoc);
1345
1346        Diag(Loc, diag::warn_objc_protocol_qualifier_missing_id)
1347          << CodeModificationHint::CreateInsertion(Loc, "id")
1348          << SourceRange(Loc, EndProtoLoc);
1349        // Need to support trailing type qualifiers (e.g. "id<p> const").
1350        // If a type specifier follows, it will be diagnosed elsewhere.
1351        continue;
1352      }
1353    }
1354    // If the specifier wasn't legal, issue a diagnostic.
1355    if (isInvalid) {
1356      assert(PrevSpec && "Method did not return previous specifier!");
1357      assert(DiagID);
1358      Diag(Tok, DiagID) << PrevSpec;
1359    }
1360    DS.SetRangeEnd(Tok.getLocation());
1361    ConsumeToken();
1362  }
1363}
1364
1365/// ParseOptionalTypeSpecifier - Try to parse a single type-specifier. We
1366/// primarily follow the C++ grammar with additions for C99 and GNU,
1367/// which together subsume the C grammar. Note that the C++
1368/// type-specifier also includes the C type-qualifier (for const,
1369/// volatile, and C99 restrict). Returns true if a type-specifier was
1370/// found (and parsed), false otherwise.
1371///
1372///       type-specifier: [C++ 7.1.5]
1373///         simple-type-specifier
1374///         class-specifier
1375///         enum-specifier
1376///         elaborated-type-specifier  [TODO]
1377///         cv-qualifier
1378///
1379///       cv-qualifier: [C++ 7.1.5.1]
1380///         'const'
1381///         'volatile'
1382/// [C99]   'restrict'
1383///
1384///       simple-type-specifier: [ C++ 7.1.5.2]
1385///         '::'[opt] nested-name-specifier[opt] type-name [TODO]
1386///         '::'[opt] nested-name-specifier 'template' template-id [TODO]
1387///         'char'
1388///         'wchar_t'
1389///         'bool'
1390///         'short'
1391///         'int'
1392///         'long'
1393///         'signed'
1394///         'unsigned'
1395///         'float'
1396///         'double'
1397///         'void'
1398/// [C99]   '_Bool'
1399/// [C99]   '_Complex'
1400/// [C99]   '_Imaginary'  // Removed in TC2?
1401/// [GNU]   '_Decimal32'
1402/// [GNU]   '_Decimal64'
1403/// [GNU]   '_Decimal128'
1404/// [GNU]   typeof-specifier
1405/// [OBJC]  class-name objc-protocol-refs[opt]    [TODO]
1406/// [OBJC]  typedef-name objc-protocol-refs[opt]  [TODO]
1407/// [C++0x] 'decltype' ( expression )
1408/// [AltiVec] '__vector'
1409bool Parser::ParseOptionalTypeSpecifier(DeclSpec &DS, bool& isInvalid,
1410                                        const char *&PrevSpec,
1411                                        unsigned &DiagID,
1412                                        const ParsedTemplateInfo &TemplateInfo,
1413                                        bool SuppressDeclarations) {
1414  SourceLocation Loc = Tok.getLocation();
1415
1416  switch (Tok.getKind()) {
1417  case tok::identifier:   // foo::bar
1418    // Check for need to substitute AltiVec keyword tokens.
1419    if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid))
1420      break;
1421    // Fall through.
1422  case tok::kw_typename:  // typename foo::bar
1423    // Annotate typenames and C++ scope specifiers.  If we get one, just
1424    // recurse to handle whatever we get.
1425    if (TryAnnotateTypeOrScopeToken())
1426      return ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID,
1427                                        TemplateInfo, SuppressDeclarations);
1428    // Otherwise, not a type specifier.
1429    return false;
1430  case tok::coloncolon:   // ::foo::bar
1431    if (NextToken().is(tok::kw_new) ||    // ::new
1432        NextToken().is(tok::kw_delete))   // ::delete
1433      return false;
1434
1435    // Annotate typenames and C++ scope specifiers.  If we get one, just
1436    // recurse to handle whatever we get.
1437    if (TryAnnotateTypeOrScopeToken())
1438      return ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID,
1439                                        TemplateInfo, SuppressDeclarations);
1440    // Otherwise, not a type specifier.
1441    return false;
1442
1443  // simple-type-specifier:
1444  case tok::annot_typename: {
1445    if (Tok.getAnnotationValue())
1446      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
1447                                     DiagID, Tok.getAnnotationValue());
1448    else
1449      DS.SetTypeSpecError();
1450    DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1451    ConsumeToken(); // The typename
1452
1453    // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
1454    // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
1455    // Objective-C interface.  If we don't have Objective-C or a '<', this is
1456    // just a normal reference to a typedef name.
1457    if (!Tok.is(tok::less) || !getLang().ObjC1)
1458      return true;
1459
1460    SourceLocation LAngleLoc, EndProtoLoc;
1461    llvm::SmallVector<DeclPtrTy, 8> ProtocolDecl;
1462    llvm::SmallVector<SourceLocation, 8> ProtocolLocs;
1463    ParseObjCProtocolReferences(ProtocolDecl, ProtocolLocs, false,
1464                                LAngleLoc, EndProtoLoc);
1465    DS.setProtocolQualifiers(ProtocolDecl.data(), ProtocolDecl.size(),
1466                             ProtocolLocs.data(), LAngleLoc);
1467
1468    DS.SetRangeEnd(EndProtoLoc);
1469    return true;
1470  }
1471
1472  case tok::kw_short:
1473    isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID);
1474    break;
1475  case tok::kw_long:
1476    if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
1477      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec,
1478                                      DiagID);
1479    else
1480      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec,
1481                                      DiagID);
1482    break;
1483  case tok::kw_signed:
1484    isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID);
1485    break;
1486  case tok::kw_unsigned:
1487    isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec,
1488                                   DiagID);
1489    break;
1490  case tok::kw__Complex:
1491    isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec,
1492                                      DiagID);
1493    break;
1494  case tok::kw__Imaginary:
1495    isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec,
1496                                      DiagID);
1497    break;
1498  case tok::kw_void:
1499    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID);
1500    break;
1501  case tok::kw_char:
1502    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID);
1503    break;
1504  case tok::kw_int:
1505    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID);
1506    break;
1507  case tok::kw_float:
1508    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID);
1509    break;
1510  case tok::kw_double:
1511    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID);
1512    break;
1513  case tok::kw_wchar_t:
1514    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID);
1515    break;
1516  case tok::kw_char16_t:
1517    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID);
1518    break;
1519  case tok::kw_char32_t:
1520    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID);
1521    break;
1522  case tok::kw_bool:
1523  case tok::kw__Bool:
1524    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID);
1525    break;
1526  case tok::kw__Decimal32:
1527    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec,
1528                                   DiagID);
1529    break;
1530  case tok::kw__Decimal64:
1531    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec,
1532                                   DiagID);
1533    break;
1534  case tok::kw__Decimal128:
1535    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec,
1536                                   DiagID);
1537    break;
1538  case tok::kw___vector:
1539    isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID);
1540    break;
1541  case tok::kw___pixel:
1542    isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID);
1543    break;
1544
1545  // class-specifier:
1546  case tok::kw_class:
1547  case tok::kw_struct:
1548  case tok::kw_union: {
1549    tok::TokenKind Kind = Tok.getKind();
1550    ConsumeToken();
1551    ParseClassSpecifier(Kind, Loc, DS, TemplateInfo, AS_none,
1552                        SuppressDeclarations);
1553    return true;
1554  }
1555
1556  // enum-specifier:
1557  case tok::kw_enum:
1558    ConsumeToken();
1559    ParseEnumSpecifier(Loc, DS);
1560    return true;
1561
1562  // cv-qualifier:
1563  case tok::kw_const:
1564    isInvalid = DS.SetTypeQual(DeclSpec::TQ_const   , Loc, PrevSpec,
1565                               DiagID, getLang());
1566    break;
1567  case tok::kw_volatile:
1568    isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
1569                               DiagID, getLang());
1570    break;
1571  case tok::kw_restrict:
1572    isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
1573                               DiagID, getLang());
1574    break;
1575
1576  // GNU typeof support.
1577  case tok::kw_typeof:
1578    ParseTypeofSpecifier(DS);
1579    return true;
1580
1581  // C++0x decltype support.
1582  case tok::kw_decltype:
1583    ParseDecltypeSpecifier(DS);
1584    return true;
1585
1586  // C++0x auto support.
1587  case tok::kw_auto:
1588    if (!getLang().CPlusPlus0x)
1589      return false;
1590
1591    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto, Loc, PrevSpec, DiagID);
1592    break;
1593  case tok::kw___ptr64:
1594  case tok::kw___w64:
1595  case tok::kw___cdecl:
1596  case tok::kw___stdcall:
1597  case tok::kw___fastcall:
1598    DS.AddAttributes(ParseMicrosoftTypeAttributes());
1599    return true;
1600
1601  default:
1602    // Not a type-specifier; do nothing.
1603    return false;
1604  }
1605
1606  // If the specifier combination wasn't legal, issue a diagnostic.
1607  if (isInvalid) {
1608    assert(PrevSpec && "Method did not return previous specifier!");
1609    // Pick between error or extwarn.
1610    Diag(Tok, DiagID) << PrevSpec;
1611  }
1612  DS.SetRangeEnd(Tok.getLocation());
1613  ConsumeToken(); // whatever we parsed above.
1614  return true;
1615}
1616
1617/// ParseStructDeclaration - Parse a struct declaration without the terminating
1618/// semicolon.
1619///
1620///       struct-declaration:
1621///         specifier-qualifier-list struct-declarator-list
1622/// [GNU]   __extension__ struct-declaration
1623/// [GNU]   specifier-qualifier-list
1624///       struct-declarator-list:
1625///         struct-declarator
1626///         struct-declarator-list ',' struct-declarator
1627/// [GNU]   struct-declarator-list ',' attributes[opt] struct-declarator
1628///       struct-declarator:
1629///         declarator
1630/// [GNU]   declarator attributes[opt]
1631///         declarator[opt] ':' constant-expression
1632/// [GNU]   declarator[opt] ':' constant-expression attributes[opt]
1633///
1634void Parser::
1635ParseStructDeclaration(DeclSpec &DS, FieldCallback &Fields) {
1636  if (Tok.is(tok::kw___extension__)) {
1637    // __extension__ silences extension warnings in the subexpression.
1638    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1639    ConsumeToken();
1640    return ParseStructDeclaration(DS, Fields);
1641  }
1642
1643  // Parse the common specifier-qualifiers-list piece.
1644  SourceLocation DSStart = Tok.getLocation();
1645  ParseSpecifierQualifierList(DS);
1646
1647  // If there are no declarators, this is a free-standing declaration
1648  // specifier. Let the actions module cope with it.
1649  if (Tok.is(tok::semi)) {
1650    Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1651    return;
1652  }
1653
1654  // Read struct-declarators until we find the semicolon.
1655  bool FirstDeclarator = true;
1656  while (1) {
1657    ParsingDeclRAIIObject PD(*this);
1658    FieldDeclarator DeclaratorInfo(DS);
1659
1660    // Attributes are only allowed here on successive declarators.
1661    if (!FirstDeclarator && Tok.is(tok::kw___attribute)) {
1662      SourceLocation Loc;
1663      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1664      DeclaratorInfo.D.AddAttributes(AttrList, Loc);
1665    }
1666
1667    /// struct-declarator: declarator
1668    /// struct-declarator: declarator[opt] ':' constant-expression
1669    if (Tok.isNot(tok::colon)) {
1670      // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1671      ColonProtectionRAIIObject X(*this);
1672      ParseDeclarator(DeclaratorInfo.D);
1673    }
1674
1675    if (Tok.is(tok::colon)) {
1676      ConsumeToken();
1677      OwningExprResult Res(ParseConstantExpression());
1678      if (Res.isInvalid())
1679        SkipUntil(tok::semi, true, true);
1680      else
1681        DeclaratorInfo.BitfieldSize = Res.release();
1682    }
1683
1684    // If attributes exist after the declarator, parse them.
1685    if (Tok.is(tok::kw___attribute)) {
1686      SourceLocation Loc;
1687      AttributeList *AttrList = ParseGNUAttributes(&Loc);
1688      DeclaratorInfo.D.AddAttributes(AttrList, Loc);
1689    }
1690
1691    // We're done with this declarator;  invoke the callback.
1692    DeclPtrTy D = Fields.invoke(DeclaratorInfo);
1693    PD.complete(D);
1694
1695    // If we don't have a comma, it is either the end of the list (a ';')
1696    // or an error, bail out.
1697    if (Tok.isNot(tok::comma))
1698      return;
1699
1700    // Consume the comma.
1701    ConsumeToken();
1702
1703    FirstDeclarator = false;
1704  }
1705}
1706
1707/// ParseStructUnionBody
1708///       struct-contents:
1709///         struct-declaration-list
1710/// [EXT]   empty
1711/// [GNU]   "struct-declaration-list" without terminatoring ';'
1712///       struct-declaration-list:
1713///         struct-declaration
1714///         struct-declaration-list struct-declaration
1715/// [OBC]   '@' 'defs' '(' class-name ')'
1716///
1717void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
1718                                  unsigned TagType, DeclPtrTy TagDecl) {
1719  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1720                                        PP.getSourceManager(),
1721                                        "parsing struct/union body");
1722
1723  SourceLocation LBraceLoc = ConsumeBrace();
1724
1725  ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope);
1726  Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1727
1728  // Empty structs are an extension in C (C99 6.7.2.1p7), but are allowed in
1729  // C++.
1730  if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
1731    Diag(Tok, diag::ext_empty_struct_union_enum)
1732      << DeclSpec::getSpecifierName((DeclSpec::TST)TagType);
1733
1734  llvm::SmallVector<DeclPtrTy, 32> FieldDecls;
1735
1736  // While we still have something to read, read the declarations in the struct.
1737  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1738    // Each iteration of this loop reads one struct-declaration.
1739
1740    // Check for extraneous top-level semicolon.
1741    if (Tok.is(tok::semi)) {
1742      Diag(Tok, diag::ext_extra_struct_semi)
1743        << CodeModificationHint::CreateRemoval(Tok.getLocation());
1744      ConsumeToken();
1745      continue;
1746    }
1747
1748    // Parse all the comma separated declarators.
1749    DeclSpec DS;
1750
1751    if (!Tok.is(tok::at)) {
1752      struct CFieldCallback : FieldCallback {
1753        Parser &P;
1754        DeclPtrTy TagDecl;
1755        llvm::SmallVectorImpl<DeclPtrTy> &FieldDecls;
1756
1757        CFieldCallback(Parser &P, DeclPtrTy TagDecl,
1758                       llvm::SmallVectorImpl<DeclPtrTy> &FieldDecls) :
1759          P(P), TagDecl(TagDecl), FieldDecls(FieldDecls) {}
1760
1761        virtual DeclPtrTy invoke(FieldDeclarator &FD) {
1762          // Install the declarator into the current TagDecl.
1763          DeclPtrTy Field = P.Actions.ActOnField(P.CurScope, TagDecl,
1764                              FD.D.getDeclSpec().getSourceRange().getBegin(),
1765                                                 FD.D, FD.BitfieldSize);
1766          FieldDecls.push_back(Field);
1767          return Field;
1768        }
1769      } Callback(*this, TagDecl, FieldDecls);
1770
1771      ParseStructDeclaration(DS, Callback);
1772    } else { // Handle @defs
1773      ConsumeToken();
1774      if (!Tok.isObjCAtKeyword(tok::objc_defs)) {
1775        Diag(Tok, diag::err_unexpected_at);
1776        SkipUntil(tok::semi, true);
1777        continue;
1778      }
1779      ConsumeToken();
1780      ExpectAndConsume(tok::l_paren, diag::err_expected_lparen);
1781      if (!Tok.is(tok::identifier)) {
1782        Diag(Tok, diag::err_expected_ident);
1783        SkipUntil(tok::semi, true);
1784        continue;
1785      }
1786      llvm::SmallVector<DeclPtrTy, 16> Fields;
1787      Actions.ActOnDefs(CurScope, TagDecl, Tok.getLocation(),
1788                        Tok.getIdentifierInfo(), Fields);
1789      FieldDecls.insert(FieldDecls.end(), Fields.begin(), Fields.end());
1790      ConsumeToken();
1791      ExpectAndConsume(tok::r_paren, diag::err_expected_rparen);
1792    }
1793
1794    if (Tok.is(tok::semi)) {
1795      ConsumeToken();
1796    } else if (Tok.is(tok::r_brace)) {
1797      ExpectAndConsume(tok::semi, diag::ext_expected_semi_decl_list);
1798      break;
1799    } else {
1800      ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list);
1801      // Skip to end of block or statement to avoid ext-warning on extra ';'.
1802      SkipUntil(tok::r_brace, true, true);
1803      // If we stopped at a ';', eat it.
1804      if (Tok.is(tok::semi)) ConsumeToken();
1805    }
1806  }
1807
1808  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1809
1810  AttributeList *AttrList = 0;
1811  // If attributes exist after struct contents, parse them.
1812  if (Tok.is(tok::kw___attribute))
1813    AttrList = ParseGNUAttributes();
1814
1815  Actions.ActOnFields(CurScope,
1816                      RecordLoc, TagDecl, FieldDecls.data(), FieldDecls.size(),
1817                      LBraceLoc, RBraceLoc,
1818                      AttrList);
1819  StructScope.Exit();
1820  Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
1821}
1822
1823
1824/// ParseEnumSpecifier
1825///       enum-specifier: [C99 6.7.2.2]
1826///         'enum' identifier[opt] '{' enumerator-list '}'
1827///[C99/C++]'enum' identifier[opt] '{' enumerator-list ',' '}'
1828/// [GNU]   'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt]
1829///                                                 '}' attributes[opt]
1830///         'enum' identifier
1831/// [GNU]   'enum' attributes[opt] identifier
1832///
1833/// [C++] elaborated-type-specifier:
1834/// [C++]   'enum' '::'[opt] nested-name-specifier[opt] identifier
1835///
1836void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
1837                                AccessSpecifier AS) {
1838  // Parse the tag portion of this.
1839  if (Tok.is(tok::code_completion)) {
1840    // Code completion for an enum name.
1841    Actions.CodeCompleteTag(CurScope, DeclSpec::TST_enum);
1842    ConsumeToken();
1843  }
1844
1845  AttributeList *Attr = 0;
1846  // If attributes exist after tag, parse them.
1847  if (Tok.is(tok::kw___attribute))
1848    Attr = ParseGNUAttributes();
1849
1850  CXXScopeSpec SS;
1851  if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS, 0, false)) {
1852    if (Tok.isNot(tok::identifier)) {
1853      Diag(Tok, diag::err_expected_ident);
1854      if (Tok.isNot(tok::l_brace)) {
1855        // Has no name and is not a definition.
1856        // Skip the rest of this declarator, up until the comma or semicolon.
1857        SkipUntil(tok::comma, true);
1858        return;
1859      }
1860    }
1861  }
1862
1863  // Must have either 'enum name' or 'enum {...}'.
1864  if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace)) {
1865    Diag(Tok, diag::err_expected_ident_lbrace);
1866
1867    // Skip the rest of this declarator, up until the comma or semicolon.
1868    SkipUntil(tok::comma, true);
1869    return;
1870  }
1871
1872  // If an identifier is present, consume and remember it.
1873  IdentifierInfo *Name = 0;
1874  SourceLocation NameLoc;
1875  if (Tok.is(tok::identifier)) {
1876    Name = Tok.getIdentifierInfo();
1877    NameLoc = ConsumeToken();
1878  }
1879
1880  // There are three options here.  If we have 'enum foo;', then this is a
1881  // forward declaration.  If we have 'enum foo {...' then this is a
1882  // definition. Otherwise we have something like 'enum foo xyz', a reference.
1883  //
1884  // This is needed to handle stuff like this right (C99 6.7.2.3p11):
1885  // enum foo {..};  void bar() { enum foo; }    <- new foo in bar.
1886  // enum foo {..};  void bar() { enum foo x; }  <- use of old foo.
1887  //
1888  Action::TagUseKind TUK;
1889  if (Tok.is(tok::l_brace))
1890    TUK = Action::TUK_Definition;
1891  else if (Tok.is(tok::semi))
1892    TUK = Action::TUK_Declaration;
1893  else
1894    TUK = Action::TUK_Reference;
1895  bool Owned = false;
1896  bool IsDependent = false;
1897  DeclPtrTy TagDecl = Actions.ActOnTag(CurScope, DeclSpec::TST_enum, TUK,
1898                                       StartLoc, SS, Name, NameLoc, Attr, AS,
1899                                       Action::MultiTemplateParamsArg(Actions),
1900                                       Owned, IsDependent);
1901  assert(!IsDependent && "didn't expect dependent enum");
1902
1903  if (Tok.is(tok::l_brace))
1904    ParseEnumBody(StartLoc, TagDecl);
1905
1906  // FIXME: The DeclSpec should keep the locations of both the keyword and the
1907  // name (if there is one).
1908  SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
1909  const char *PrevSpec = 0;
1910  unsigned DiagID;
1911  if (DS.SetTypeSpecType(DeclSpec::TST_enum, TSTLoc, PrevSpec, DiagID,
1912                         TagDecl.getAs<void>(), Owned))
1913    Diag(StartLoc, DiagID) << PrevSpec;
1914}
1915
1916/// ParseEnumBody - Parse a {} enclosed enumerator-list.
1917///       enumerator-list:
1918///         enumerator
1919///         enumerator-list ',' enumerator
1920///       enumerator:
1921///         enumeration-constant
1922///         enumeration-constant '=' constant-expression
1923///       enumeration-constant:
1924///         identifier
1925///
1926void Parser::ParseEnumBody(SourceLocation StartLoc, DeclPtrTy EnumDecl) {
1927  // Enter the scope of the enum body and start the definition.
1928  ParseScope EnumScope(this, Scope::DeclScope);
1929  Actions.ActOnTagStartDefinition(CurScope, EnumDecl);
1930
1931  SourceLocation LBraceLoc = ConsumeBrace();
1932
1933  // C does not allow an empty enumerator-list, C++ does [dcl.enum].
1934  if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
1935    Diag(Tok, diag::ext_empty_struct_union_enum) << "enum";
1936
1937  llvm::SmallVector<DeclPtrTy, 32> EnumConstantDecls;
1938
1939  DeclPtrTy LastEnumConstDecl;
1940
1941  // Parse the enumerator-list.
1942  while (Tok.is(tok::identifier)) {
1943    IdentifierInfo *Ident = Tok.getIdentifierInfo();
1944    SourceLocation IdentLoc = ConsumeToken();
1945
1946    SourceLocation EqualLoc;
1947    OwningExprResult AssignedVal(Actions);
1948    if (Tok.is(tok::equal)) {
1949      EqualLoc = ConsumeToken();
1950      AssignedVal = ParseConstantExpression();
1951      if (AssignedVal.isInvalid())
1952        SkipUntil(tok::comma, tok::r_brace, true, true);
1953    }
1954
1955    // Install the enumerator constant into EnumDecl.
1956    DeclPtrTy EnumConstDecl = Actions.ActOnEnumConstant(CurScope, EnumDecl,
1957                                                        LastEnumConstDecl,
1958                                                        IdentLoc, Ident,
1959                                                        EqualLoc,
1960                                                        AssignedVal.release());
1961    EnumConstantDecls.push_back(EnumConstDecl);
1962    LastEnumConstDecl = EnumConstDecl;
1963
1964    if (Tok.isNot(tok::comma))
1965      break;
1966    SourceLocation CommaLoc = ConsumeToken();
1967
1968    if (Tok.isNot(tok::identifier) &&
1969        !(getLang().C99 || getLang().CPlusPlus0x))
1970      Diag(CommaLoc, diag::ext_enumerator_list_comma)
1971        << getLang().CPlusPlus
1972        << CodeModificationHint::CreateRemoval(CommaLoc);
1973  }
1974
1975  // Eat the }.
1976  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1977
1978  AttributeList *Attr = 0;
1979  // If attributes exist after the identifier list, parse them.
1980  if (Tok.is(tok::kw___attribute))
1981    Attr = ParseGNUAttributes(); // FIXME: where do they do?
1982
1983  Actions.ActOnEnumBody(StartLoc, LBraceLoc, RBraceLoc, EnumDecl,
1984                        EnumConstantDecls.data(), EnumConstantDecls.size(),
1985                        CurScope, Attr);
1986
1987  EnumScope.Exit();
1988  Actions.ActOnTagFinishDefinition(CurScope, EnumDecl, RBraceLoc);
1989}
1990
1991/// isTypeSpecifierQualifier - Return true if the current token could be the
1992/// start of a type-qualifier-list.
1993bool Parser::isTypeQualifier() const {
1994  switch (Tok.getKind()) {
1995  default: return false;
1996    // type-qualifier
1997  case tok::kw_const:
1998  case tok::kw_volatile:
1999  case tok::kw_restrict:
2000    return true;
2001  }
2002}
2003
2004/// isTypeSpecifierQualifier - Return true if the current token could be the
2005/// start of a specifier-qualifier-list.
2006bool Parser::isTypeSpecifierQualifier() {
2007  switch (Tok.getKind()) {
2008  default: return false;
2009
2010  case tok::identifier:   // foo::bar
2011    if (TryAltiVecVectorToken())
2012      return true;
2013    // Fall through.
2014  case tok::kw_typename:  // typename T::type
2015    // Annotate typenames and C++ scope specifiers.  If we get one, just
2016    // recurse to handle whatever we get.
2017    if (TryAnnotateTypeOrScopeToken())
2018      return isTypeSpecifierQualifier();
2019    // Otherwise, not a type specifier.
2020    return false;
2021
2022  case tok::coloncolon:   // ::foo::bar
2023    if (NextToken().is(tok::kw_new) ||    // ::new
2024        NextToken().is(tok::kw_delete))   // ::delete
2025      return false;
2026
2027    // Annotate typenames and C++ scope specifiers.  If we get one, just
2028    // recurse to handle whatever we get.
2029    if (TryAnnotateTypeOrScopeToken())
2030      return isTypeSpecifierQualifier();
2031    // Otherwise, not a type specifier.
2032    return false;
2033
2034    // GNU attributes support.
2035  case tok::kw___attribute:
2036    // GNU typeof support.
2037  case tok::kw_typeof:
2038
2039    // type-specifiers
2040  case tok::kw_short:
2041  case tok::kw_long:
2042  case tok::kw_signed:
2043  case tok::kw_unsigned:
2044  case tok::kw__Complex:
2045  case tok::kw__Imaginary:
2046  case tok::kw_void:
2047  case tok::kw_char:
2048  case tok::kw_wchar_t:
2049  case tok::kw_char16_t:
2050  case tok::kw_char32_t:
2051  case tok::kw_int:
2052  case tok::kw_float:
2053  case tok::kw_double:
2054  case tok::kw_bool:
2055  case tok::kw__Bool:
2056  case tok::kw__Decimal32:
2057  case tok::kw__Decimal64:
2058  case tok::kw__Decimal128:
2059  case tok::kw___vector:
2060
2061    // struct-or-union-specifier (C99) or class-specifier (C++)
2062  case tok::kw_class:
2063  case tok::kw_struct:
2064  case tok::kw_union:
2065    // enum-specifier
2066  case tok::kw_enum:
2067
2068    // type-qualifier
2069  case tok::kw_const:
2070  case tok::kw_volatile:
2071  case tok::kw_restrict:
2072
2073    // typedef-name
2074  case tok::annot_typename:
2075    return true;
2076
2077    // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
2078  case tok::less:
2079    return getLang().ObjC1;
2080
2081  case tok::kw___cdecl:
2082  case tok::kw___stdcall:
2083  case tok::kw___fastcall:
2084  case tok::kw___w64:
2085  case tok::kw___ptr64:
2086    return true;
2087  }
2088}
2089
2090/// isDeclarationSpecifier() - Return true if the current token is part of a
2091/// declaration specifier.
2092bool Parser::isDeclarationSpecifier() {
2093  switch (Tok.getKind()) {
2094  default: return false;
2095
2096  case tok::identifier:   // foo::bar
2097    // Unfortunate hack to support "Class.factoryMethod" notation.
2098    if (getLang().ObjC1 && NextToken().is(tok::period))
2099      return false;
2100    if (TryAltiVecVectorToken())
2101      return true;
2102    // Fall through.
2103
2104  case tok::kw_typename: // typename T::type
2105    // Annotate typenames and C++ scope specifiers.  If we get one, just
2106    // recurse to handle whatever we get.
2107    if (TryAnnotateTypeOrScopeToken())
2108      return isDeclarationSpecifier();
2109    // Otherwise, not a declaration specifier.
2110    return false;
2111  case tok::coloncolon:   // ::foo::bar
2112    if (NextToken().is(tok::kw_new) ||    // ::new
2113        NextToken().is(tok::kw_delete))   // ::delete
2114      return false;
2115
2116    // Annotate typenames and C++ scope specifiers.  If we get one, just
2117    // recurse to handle whatever we get.
2118    if (TryAnnotateTypeOrScopeToken())
2119      return isDeclarationSpecifier();
2120    // Otherwise, not a declaration specifier.
2121    return false;
2122
2123    // storage-class-specifier
2124  case tok::kw_typedef:
2125  case tok::kw_extern:
2126  case tok::kw___private_extern__:
2127  case tok::kw_static:
2128  case tok::kw_auto:
2129  case tok::kw_register:
2130  case tok::kw___thread:
2131
2132    // type-specifiers
2133  case tok::kw_short:
2134  case tok::kw_long:
2135  case tok::kw_signed:
2136  case tok::kw_unsigned:
2137  case tok::kw__Complex:
2138  case tok::kw__Imaginary:
2139  case tok::kw_void:
2140  case tok::kw_char:
2141  case tok::kw_wchar_t:
2142  case tok::kw_char16_t:
2143  case tok::kw_char32_t:
2144
2145  case tok::kw_int:
2146  case tok::kw_float:
2147  case tok::kw_double:
2148  case tok::kw_bool:
2149  case tok::kw__Bool:
2150  case tok::kw__Decimal32:
2151  case tok::kw__Decimal64:
2152  case tok::kw__Decimal128:
2153  case tok::kw___vector:
2154
2155    // struct-or-union-specifier (C99) or class-specifier (C++)
2156  case tok::kw_class:
2157  case tok::kw_struct:
2158  case tok::kw_union:
2159    // enum-specifier
2160  case tok::kw_enum:
2161
2162    // type-qualifier
2163  case tok::kw_const:
2164  case tok::kw_volatile:
2165  case tok::kw_restrict:
2166
2167    // function-specifier
2168  case tok::kw_inline:
2169  case tok::kw_virtual:
2170  case tok::kw_explicit:
2171
2172    // typedef-name
2173  case tok::annot_typename:
2174
2175    // GNU typeof support.
2176  case tok::kw_typeof:
2177
2178    // GNU attributes.
2179  case tok::kw___attribute:
2180    return true;
2181
2182    // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
2183  case tok::less:
2184    return getLang().ObjC1;
2185
2186  case tok::kw___declspec:
2187  case tok::kw___cdecl:
2188  case tok::kw___stdcall:
2189  case tok::kw___fastcall:
2190  case tok::kw___w64:
2191  case tok::kw___ptr64:
2192  case tok::kw___forceinline:
2193    return true;
2194  }
2195}
2196
2197bool Parser::isConstructorDeclarator() {
2198  TentativeParsingAction TPA(*this);
2199
2200  // Parse the C++ scope specifier.
2201  CXXScopeSpec SS;
2202  ParseOptionalCXXScopeSpecifier(SS, 0, true);
2203
2204  // Parse the constructor name.
2205  if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id)) {
2206    // We already know that we have a constructor name; just consume
2207    // the token.
2208    ConsumeToken();
2209  } else {
2210    TPA.Revert();
2211    return false;
2212  }
2213
2214  // Current class name must be followed by a left parentheses.
2215  if (Tok.isNot(tok::l_paren)) {
2216    TPA.Revert();
2217    return false;
2218  }
2219  ConsumeParen();
2220
2221  // A right parentheses or ellipsis signals that we have a constructor.
2222  if (Tok.is(tok::r_paren) || Tok.is(tok::ellipsis)) {
2223    TPA.Revert();
2224    return true;
2225  }
2226
2227  // If we need to, enter the specified scope.
2228  DeclaratorScopeObj DeclScopeObj(*this, SS);
2229  if (SS.isSet() && Actions.ShouldEnterDeclaratorScope(CurScope, SS))
2230    DeclScopeObj.EnterDeclaratorScope();
2231
2232  // Check whether the next token(s) are part of a declaration
2233  // specifier, in which case we have the start of a parameter and,
2234  // therefore, we know that this is a constructor.
2235  bool IsConstructor = isDeclarationSpecifier();
2236  TPA.Revert();
2237  return IsConstructor;
2238}
2239
2240/// ParseTypeQualifierListOpt
2241///       type-qualifier-list: [C99 6.7.5]
2242///         type-qualifier
2243/// [GNU]   attributes                        [ only if AttributesAllowed=true ]
2244///         type-qualifier-list type-qualifier
2245/// [GNU]   type-qualifier-list attributes    [ only if AttributesAllowed=true ]
2246/// [C++0x] attribute-specifier[opt] is allowed before cv-qualifier-seq
2247///           if CXX0XAttributesAllowed = true
2248///
2249void Parser::ParseTypeQualifierListOpt(DeclSpec &DS, bool GNUAttributesAllowed,
2250                                       bool CXX0XAttributesAllowed) {
2251  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
2252    SourceLocation Loc = Tok.getLocation();
2253    CXX0XAttributeList Attr = ParseCXX0XAttributes();
2254    if (CXX0XAttributesAllowed)
2255      DS.AddAttributes(Attr.AttrList);
2256    else
2257      Diag(Loc, diag::err_attributes_not_allowed);
2258  }
2259
2260  while (1) {
2261    bool isInvalid = false;
2262    const char *PrevSpec = 0;
2263    unsigned DiagID = 0;
2264    SourceLocation Loc = Tok.getLocation();
2265
2266    switch (Tok.getKind()) {
2267    case tok::kw_const:
2268      isInvalid = DS.SetTypeQual(DeclSpec::TQ_const   , Loc, PrevSpec, DiagID,
2269                                 getLang());
2270      break;
2271    case tok::kw_volatile:
2272      isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
2273                                 getLang());
2274      break;
2275    case tok::kw_restrict:
2276      isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
2277                                 getLang());
2278      break;
2279    case tok::kw___w64:
2280    case tok::kw___ptr64:
2281    case tok::kw___cdecl:
2282    case tok::kw___stdcall:
2283    case tok::kw___fastcall:
2284      if (GNUAttributesAllowed) {
2285        DS.AddAttributes(ParseMicrosoftTypeAttributes());
2286        continue;
2287      }
2288      goto DoneWithTypeQuals;
2289    case tok::kw___attribute:
2290      if (GNUAttributesAllowed) {
2291        DS.AddAttributes(ParseGNUAttributes());
2292        continue; // do *not* consume the next token!
2293      }
2294      // otherwise, FALL THROUGH!
2295    default:
2296      DoneWithTypeQuals:
2297      // If this is not a type-qualifier token, we're done reading type
2298      // qualifiers.  First verify that DeclSpec's are consistent.
2299      DS.Finish(Diags, PP);
2300      return;
2301    }
2302
2303    // If the specifier combination wasn't legal, issue a diagnostic.
2304    if (isInvalid) {
2305      assert(PrevSpec && "Method did not return previous specifier!");
2306      Diag(Tok, DiagID) << PrevSpec;
2307    }
2308    ConsumeToken();
2309  }
2310}
2311
2312
2313/// ParseDeclarator - Parse and verify a newly-initialized declarator.
2314///
2315void Parser::ParseDeclarator(Declarator &D) {
2316  /// This implements the 'declarator' production in the C grammar, then checks
2317  /// for well-formedness and issues diagnostics.
2318  ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
2319}
2320
2321/// ParseDeclaratorInternal - Parse a C or C++ declarator. The direct-declarator
2322/// is parsed by the function passed to it. Pass null, and the direct-declarator
2323/// isn't parsed at all, making this function effectively parse the C++
2324/// ptr-operator production.
2325///
2326///       declarator: [C99 6.7.5] [C++ 8p4, dcl.decl]
2327/// [C]     pointer[opt] direct-declarator
2328/// [C++]   direct-declarator
2329/// [C++]   ptr-operator declarator
2330///
2331///       pointer: [C99 6.7.5]
2332///         '*' type-qualifier-list[opt]
2333///         '*' type-qualifier-list[opt] pointer
2334///
2335///       ptr-operator:
2336///         '*' cv-qualifier-seq[opt]
2337///         '&'
2338/// [C++0x] '&&'
2339/// [GNU]   '&' restrict[opt] attributes[opt]
2340/// [GNU?]  '&&' restrict[opt] attributes[opt]
2341///         '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt]
2342void Parser::ParseDeclaratorInternal(Declarator &D,
2343                                     DirectDeclParseFunction DirectDeclParser) {
2344  if (Diags.hasAllExtensionsSilenced())
2345    D.setExtension();
2346  // C++ member pointers start with a '::' or a nested-name.
2347  // Member pointers get special handling, since there's no place for the
2348  // scope spec in the generic path below.
2349  if (getLang().CPlusPlus &&
2350      (Tok.is(tok::coloncolon) || Tok.is(tok::identifier) ||
2351       Tok.is(tok::annot_cxxscope))) {
2352    CXXScopeSpec SS;
2353    if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true)) {
2354      if (Tok.isNot(tok::star)) {
2355        // The scope spec really belongs to the direct-declarator.
2356        D.getCXXScopeSpec() = SS;
2357        if (DirectDeclParser)
2358          (this->*DirectDeclParser)(D);
2359        return;
2360      }
2361
2362      SourceLocation Loc = ConsumeToken();
2363      D.SetRangeEnd(Loc);
2364      DeclSpec DS;
2365      ParseTypeQualifierListOpt(DS);
2366      D.ExtendWithDeclSpec(DS);
2367
2368      // Recurse to parse whatever is left.
2369      ParseDeclaratorInternal(D, DirectDeclParser);
2370
2371      // Sema will have to catch (syntactically invalid) pointers into global
2372      // scope. It has to catch pointers into namespace scope anyway.
2373      D.AddTypeInfo(DeclaratorChunk::getMemberPointer(SS,DS.getTypeQualifiers(),
2374                                                      Loc, DS.TakeAttributes()),
2375                    /* Don't replace range end. */SourceLocation());
2376      return;
2377    }
2378  }
2379
2380  tok::TokenKind Kind = Tok.getKind();
2381  // Not a pointer, C++ reference, or block.
2382  if (Kind != tok::star && Kind != tok::caret &&
2383      (Kind != tok::amp || !getLang().CPlusPlus) &&
2384      // We parse rvalue refs in C++03, because otherwise the errors are scary.
2385      (Kind != tok::ampamp || !getLang().CPlusPlus)) {
2386    if (DirectDeclParser)
2387      (this->*DirectDeclParser)(D);
2388    return;
2389  }
2390
2391  // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference,
2392  // '&&' -> rvalue reference
2393  SourceLocation Loc = ConsumeToken();  // Eat the *, ^, & or &&.
2394  D.SetRangeEnd(Loc);
2395
2396  if (Kind == tok::star || Kind == tok::caret) {
2397    // Is a pointer.
2398    DeclSpec DS;
2399
2400    ParseTypeQualifierListOpt(DS);
2401    D.ExtendWithDeclSpec(DS);
2402
2403    // Recursively parse the declarator.
2404    ParseDeclaratorInternal(D, DirectDeclParser);
2405    if (Kind == tok::star)
2406      // Remember that we parsed a pointer type, and remember the type-quals.
2407      D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc,
2408                                                DS.TakeAttributes()),
2409                    SourceLocation());
2410    else
2411      // Remember that we parsed a Block type, and remember the type-quals.
2412      D.AddTypeInfo(DeclaratorChunk::getBlockPointer(DS.getTypeQualifiers(),
2413                                                     Loc, DS.TakeAttributes()),
2414                    SourceLocation());
2415  } else {
2416    // Is a reference
2417    DeclSpec DS;
2418
2419    // Complain about rvalue references in C++03, but then go on and build
2420    // the declarator.
2421    if (Kind == tok::ampamp && !getLang().CPlusPlus0x)
2422      Diag(Loc, diag::err_rvalue_reference);
2423
2424    // C++ 8.3.2p1: cv-qualified references are ill-formed except when the
2425    // cv-qualifiers are introduced through the use of a typedef or of a
2426    // template type argument, in which case the cv-qualifiers are ignored.
2427    //
2428    // [GNU] Retricted references are allowed.
2429    // [GNU] Attributes on references are allowed.
2430    // [C++0x] Attributes on references are not allowed.
2431    ParseTypeQualifierListOpt(DS, true, false);
2432    D.ExtendWithDeclSpec(DS);
2433
2434    if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
2435      if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2436        Diag(DS.getConstSpecLoc(),
2437             diag::err_invalid_reference_qualifier_application) << "const";
2438      if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2439        Diag(DS.getVolatileSpecLoc(),
2440             diag::err_invalid_reference_qualifier_application) << "volatile";
2441    }
2442
2443    // Recursively parse the declarator.
2444    ParseDeclaratorInternal(D, DirectDeclParser);
2445
2446    if (D.getNumTypeObjects() > 0) {
2447      // C++ [dcl.ref]p4: There shall be no references to references.
2448      DeclaratorChunk& InnerChunk = D.getTypeObject(D.getNumTypeObjects() - 1);
2449      if (InnerChunk.Kind == DeclaratorChunk::Reference) {
2450        if (const IdentifierInfo *II = D.getIdentifier())
2451          Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
2452           << II;
2453        else
2454          Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
2455            << "type name";
2456
2457        // Once we've complained about the reference-to-reference, we
2458        // can go ahead and build the (technically ill-formed)
2459        // declarator: reference collapsing will take care of it.
2460      }
2461    }
2462
2463    // Remember that we parsed a reference type. It doesn't have type-quals.
2464    D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc,
2465                                                DS.TakeAttributes(),
2466                                                Kind == tok::amp),
2467                  SourceLocation());
2468  }
2469}
2470
2471/// ParseDirectDeclarator
2472///       direct-declarator: [C99 6.7.5]
2473/// [C99]   identifier
2474///         '(' declarator ')'
2475/// [GNU]   '(' attributes declarator ')'
2476/// [C90]   direct-declarator '[' constant-expression[opt] ']'
2477/// [C99]   direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
2478/// [C99]   direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
2479/// [C99]   direct-declarator '[' type-qual-list 'static' assignment-expr ']'
2480/// [C99]   direct-declarator '[' type-qual-list[opt] '*' ']'
2481///         direct-declarator '(' parameter-type-list ')'
2482///         direct-declarator '(' identifier-list[opt] ')'
2483/// [GNU]   direct-declarator '(' parameter-forward-declarations
2484///                    parameter-type-list[opt] ')'
2485/// [C++]   direct-declarator '(' parameter-declaration-clause ')'
2486///                    cv-qualifier-seq[opt] exception-specification[opt]
2487/// [C++]   declarator-id
2488///
2489///       declarator-id: [C++ 8]
2490///         id-expression
2491///         '::'[opt] nested-name-specifier[opt] type-name
2492///
2493///       id-expression: [C++ 5.1]
2494///         unqualified-id
2495///         qualified-id
2496///
2497///       unqualified-id: [C++ 5.1]
2498///         identifier
2499///         operator-function-id
2500///         conversion-function-id
2501///          '~' class-name
2502///         template-id
2503///
2504void Parser::ParseDirectDeclarator(Declarator &D) {
2505  DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec());
2506
2507  if (getLang().CPlusPlus && D.mayHaveIdentifier()) {
2508    // ParseDeclaratorInternal might already have parsed the scope.
2509    bool afterCXXScope = D.getCXXScopeSpec().isSet() ||
2510      ParseOptionalCXXScopeSpecifier(D.getCXXScopeSpec(), /*ObjectType=*/0,
2511                                     true);
2512    if (afterCXXScope) {
2513      if (Actions.ShouldEnterDeclaratorScope(CurScope, D.getCXXScopeSpec()))
2514        // Change the declaration context for name lookup, until this function
2515        // is exited (and the declarator has been parsed).
2516        DeclScopeObj.EnterDeclaratorScope();
2517    }
2518
2519    if (Tok.is(tok::identifier) || Tok.is(tok::kw_operator) ||
2520        Tok.is(tok::annot_template_id) || Tok.is(tok::tilde)) {
2521      // We found something that indicates the start of an unqualified-id.
2522      // Parse that unqualified-id.
2523      bool AllowConstructorName
2524        = ((D.getCXXScopeSpec().isSet() &&
2525            D.getContext() == Declarator::FileContext) ||
2526           (!D.getCXXScopeSpec().isSet() &&
2527            D.getContext() == Declarator::MemberContext)) &&
2528        !D.getDeclSpec().hasTypeSpecifier();
2529      if (ParseUnqualifiedId(D.getCXXScopeSpec(),
2530                             /*EnteringContext=*/true,
2531                             /*AllowDestructorName=*/true,
2532                             AllowConstructorName,
2533                             /*ObjectType=*/0,
2534                             D.getName())) {
2535        D.SetIdentifier(0, Tok.getLocation());
2536        D.setInvalidType(true);
2537      } else {
2538        // Parsed the unqualified-id; update range information and move along.
2539        if (D.getSourceRange().getBegin().isInvalid())
2540          D.SetRangeBegin(D.getName().getSourceRange().getBegin());
2541        D.SetRangeEnd(D.getName().getSourceRange().getEnd());
2542      }
2543      goto PastIdentifier;
2544    }
2545  } else if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) {
2546    assert(!getLang().CPlusPlus &&
2547           "There's a C++-specific check for tok::identifier above");
2548    assert(Tok.getIdentifierInfo() && "Not an identifier?");
2549    D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
2550    ConsumeToken();
2551    goto PastIdentifier;
2552  }
2553
2554  if (Tok.is(tok::l_paren)) {
2555    // direct-declarator: '(' declarator ')'
2556    // direct-declarator: '(' attributes declarator ')'
2557    // Example: 'char (*X)'   or 'int (*XX)(void)'
2558    ParseParenDeclarator(D);
2559
2560    // If the declarator was parenthesized, we entered the declarator
2561    // scope when parsing the parenthesized declarator, then exited
2562    // the scope already. Re-enter the scope, if we need to.
2563    if (D.getCXXScopeSpec().isSet()) {
2564      if (Actions.ShouldEnterDeclaratorScope(CurScope, D.getCXXScopeSpec()))
2565        // Change the declaration context for name lookup, until this function
2566        // is exited (and the declarator has been parsed).
2567        DeclScopeObj.EnterDeclaratorScope();
2568    }
2569  } else if (D.mayOmitIdentifier()) {
2570    // This could be something simple like "int" (in which case the declarator
2571    // portion is empty), if an abstract-declarator is allowed.
2572    D.SetIdentifier(0, Tok.getLocation());
2573  } else {
2574    if (D.getContext() == Declarator::MemberContext)
2575      Diag(Tok, diag::err_expected_member_name_or_semi)
2576        << D.getDeclSpec().getSourceRange();
2577    else if (getLang().CPlusPlus)
2578      Diag(Tok, diag::err_expected_unqualified_id) << getLang().CPlusPlus;
2579    else
2580      Diag(Tok, diag::err_expected_ident_lparen);
2581    D.SetIdentifier(0, Tok.getLocation());
2582    D.setInvalidType(true);
2583  }
2584
2585 PastIdentifier:
2586  assert(D.isPastIdentifier() &&
2587         "Haven't past the location of the identifier yet?");
2588
2589  // Don't parse attributes unless we have an identifier.
2590  if (D.getIdentifier() && getLang().CPlusPlus
2591   && isCXX0XAttributeSpecifier(true)) {
2592    SourceLocation AttrEndLoc;
2593    CXX0XAttributeList Attr = ParseCXX0XAttributes();
2594    D.AddAttributes(Attr.AttrList, AttrEndLoc);
2595  }
2596
2597  while (1) {
2598    if (Tok.is(tok::l_paren)) {
2599      // The paren may be part of a C++ direct initializer, eg. "int x(1);".
2600      // In such a case, check if we actually have a function declarator; if it
2601      // is not, the declarator has been fully parsed.
2602      if (getLang().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) {
2603        // When not in file scope, warn for ambiguous function declarators, just
2604        // in case the author intended it as a variable definition.
2605        bool warnIfAmbiguous = D.getContext() != Declarator::FileContext;
2606        if (!isCXXFunctionDeclarator(warnIfAmbiguous))
2607          break;
2608      }
2609      ParseFunctionDeclarator(ConsumeParen(), D);
2610    } else if (Tok.is(tok::l_square)) {
2611      ParseBracketDeclarator(D);
2612    } else {
2613      break;
2614    }
2615  }
2616}
2617
2618/// ParseParenDeclarator - We parsed the declarator D up to a paren.  This is
2619/// only called before the identifier, so these are most likely just grouping
2620/// parens for precedence.  If we find that these are actually function
2621/// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator.
2622///
2623///       direct-declarator:
2624///         '(' declarator ')'
2625/// [GNU]   '(' attributes declarator ')'
2626///         direct-declarator '(' parameter-type-list ')'
2627///         direct-declarator '(' identifier-list[opt] ')'
2628/// [GNU]   direct-declarator '(' parameter-forward-declarations
2629///                    parameter-type-list[opt] ')'
2630///
2631void Parser::ParseParenDeclarator(Declarator &D) {
2632  SourceLocation StartLoc = ConsumeParen();
2633  assert(!D.isPastIdentifier() && "Should be called before passing identifier");
2634
2635  // Eat any attributes before we look at whether this is a grouping or function
2636  // declarator paren.  If this is a grouping paren, the attribute applies to
2637  // the type being built up, for example:
2638  //     int (__attribute__(()) *x)(long y)
2639  // If this ends up not being a grouping paren, the attribute applies to the
2640  // first argument, for example:
2641  //     int (__attribute__(()) int x)
2642  // In either case, we need to eat any attributes to be able to determine what
2643  // sort of paren this is.
2644  //
2645  AttributeList *AttrList = 0;
2646  bool RequiresArg = false;
2647  if (Tok.is(tok::kw___attribute)) {
2648    AttrList = ParseGNUAttributes();
2649
2650    // We require that the argument list (if this is a non-grouping paren) be
2651    // present even if the attribute list was empty.
2652    RequiresArg = true;
2653  }
2654  // Eat any Microsoft extensions.
2655  if  (Tok.is(tok::kw___cdecl) || Tok.is(tok::kw___stdcall) ||
2656       Tok.is(tok::kw___fastcall) || Tok.is(tok::kw___w64) ||
2657       Tok.is(tok::kw___ptr64)) {
2658    AttrList = ParseMicrosoftTypeAttributes(AttrList);
2659  }
2660
2661  // If we haven't past the identifier yet (or where the identifier would be
2662  // stored, if this is an abstract declarator), then this is probably just
2663  // grouping parens. However, if this could be an abstract-declarator, then
2664  // this could also be the start of function arguments (consider 'void()').
2665  bool isGrouping;
2666
2667  if (!D.mayOmitIdentifier()) {
2668    // If this can't be an abstract-declarator, this *must* be a grouping
2669    // paren, because we haven't seen the identifier yet.
2670    isGrouping = true;
2671  } else if (Tok.is(tok::r_paren) ||           // 'int()' is a function.
2672             (getLang().CPlusPlus && Tok.is(tok::ellipsis)) || // C++ int(...)
2673             isDeclarationSpecifier()) {       // 'int(int)' is a function.
2674    // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
2675    // considered to be a type, not a K&R identifier-list.
2676    isGrouping = false;
2677  } else {
2678    // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
2679    isGrouping = true;
2680  }
2681
2682  // If this is a grouping paren, handle:
2683  // direct-declarator: '(' declarator ')'
2684  // direct-declarator: '(' attributes declarator ')'
2685  if (isGrouping) {
2686    bool hadGroupingParens = D.hasGroupingParens();
2687    D.setGroupingParens(true);
2688    if (AttrList)
2689      D.AddAttributes(AttrList, SourceLocation());
2690
2691    ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
2692    // Match the ')'.
2693    SourceLocation Loc = MatchRHSPunctuation(tok::r_paren, StartLoc);
2694
2695    D.setGroupingParens(hadGroupingParens);
2696    D.SetRangeEnd(Loc);
2697    return;
2698  }
2699
2700  // Okay, if this wasn't a grouping paren, it must be the start of a function
2701  // argument list.  Recognize that this declarator will never have an
2702  // identifier (and remember where it would have been), then call into
2703  // ParseFunctionDeclarator to handle of argument list.
2704  D.SetIdentifier(0, Tok.getLocation());
2705
2706  ParseFunctionDeclarator(StartLoc, D, AttrList, RequiresArg);
2707}
2708
2709/// ParseFunctionDeclarator - We are after the identifier and have parsed the
2710/// declarator D up to a paren, which indicates that we are parsing function
2711/// arguments.
2712///
2713/// If AttrList is non-null, then the caller parsed those arguments immediately
2714/// after the open paren - they should be considered to be the first argument of
2715/// a parameter.  If RequiresArg is true, then the first argument of the
2716/// function is required to be present and required to not be an identifier
2717/// list.
2718///
2719/// This method also handles this portion of the grammar:
2720///       parameter-type-list: [C99 6.7.5]
2721///         parameter-list
2722///         parameter-list ',' '...'
2723/// [C++]   parameter-list '...'
2724///
2725///       parameter-list: [C99 6.7.5]
2726///         parameter-declaration
2727///         parameter-list ',' parameter-declaration
2728///
2729///       parameter-declaration: [C99 6.7.5]
2730///         declaration-specifiers declarator
2731/// [C++]   declaration-specifiers declarator '=' assignment-expression
2732/// [GNU]   declaration-specifiers declarator attributes
2733///         declaration-specifiers abstract-declarator[opt]
2734/// [C++]   declaration-specifiers abstract-declarator[opt]
2735///           '=' assignment-expression
2736/// [GNU]   declaration-specifiers abstract-declarator[opt] attributes
2737///
2738/// For C++, after the parameter-list, it also parses "cv-qualifier-seq[opt]"
2739/// and "exception-specification[opt]".
2740///
2741void Parser::ParseFunctionDeclarator(SourceLocation LParenLoc, Declarator &D,
2742                                     AttributeList *AttrList,
2743                                     bool RequiresArg) {
2744  // lparen is already consumed!
2745  assert(D.isPastIdentifier() && "Should not call before identifier!");
2746
2747  // This parameter list may be empty.
2748  if (Tok.is(tok::r_paren)) {
2749    if (RequiresArg) {
2750      Diag(Tok, diag::err_argument_required_after_attribute);
2751      delete AttrList;
2752    }
2753
2754    SourceLocation RParenLoc = ConsumeParen();  // Eat the closing ')'.
2755    SourceLocation EndLoc = RParenLoc;
2756
2757    // cv-qualifier-seq[opt].
2758    DeclSpec DS;
2759    bool hasExceptionSpec = false;
2760    SourceLocation ThrowLoc;
2761    bool hasAnyExceptionSpec = false;
2762    llvm::SmallVector<TypeTy*, 2> Exceptions;
2763    llvm::SmallVector<SourceRange, 2> ExceptionRanges;
2764    if (getLang().CPlusPlus) {
2765      ParseTypeQualifierListOpt(DS, false /*no attributes*/);
2766      if (!DS.getSourceRange().getEnd().isInvalid())
2767        EndLoc = DS.getSourceRange().getEnd();
2768
2769      // Parse exception-specification[opt].
2770      if (Tok.is(tok::kw_throw)) {
2771        hasExceptionSpec = true;
2772        ThrowLoc = Tok.getLocation();
2773        ParseExceptionSpecification(EndLoc, Exceptions, ExceptionRanges,
2774                                    hasAnyExceptionSpec);
2775        assert(Exceptions.size() == ExceptionRanges.size() &&
2776               "Produced different number of exception types and ranges.");
2777      }
2778    }
2779
2780    // Remember that we parsed a function type, and remember the attributes.
2781    // int() -> no prototype, no '...'.
2782    D.AddTypeInfo(DeclaratorChunk::getFunction(/*prototype*/getLang().CPlusPlus,
2783                                               /*variadic*/ false,
2784                                               SourceLocation(),
2785                                               /*arglist*/ 0, 0,
2786                                               DS.getTypeQualifiers(),
2787                                               hasExceptionSpec, ThrowLoc,
2788                                               hasAnyExceptionSpec,
2789                                               Exceptions.data(),
2790                                               ExceptionRanges.data(),
2791                                               Exceptions.size(),
2792                                               LParenLoc, RParenLoc, D),
2793                  EndLoc);
2794    return;
2795  }
2796
2797  // Alternatively, this parameter list may be an identifier list form for a
2798  // K&R-style function:  void foo(a,b,c)
2799  if (!getLang().CPlusPlus && Tok.is(tok::identifier)
2800      && !TryAltiVecVectorToken()) {
2801    if (!TryAnnotateTypeOrScopeToken()) {
2802      // K&R identifier lists can't have typedefs as identifiers, per
2803      // C99 6.7.5.3p11.
2804      if (RequiresArg) {
2805        Diag(Tok, diag::err_argument_required_after_attribute);
2806        delete AttrList;
2807      }
2808      // Identifier list.  Note that '(' identifier-list ')' is only allowed for
2809      // normal declarators, not for abstract-declarators.
2810      return ParseFunctionDeclaratorIdentifierList(LParenLoc, D);
2811    }
2812  }
2813
2814  // Finally, a normal, non-empty parameter type list.
2815
2816  // Build up an array of information about the parsed arguments.
2817  llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
2818
2819  // Enter function-declaration scope, limiting any declarators to the
2820  // function prototype scope, including parameter declarators.
2821  ParseScope PrototypeScope(this,
2822                            Scope::FunctionPrototypeScope|Scope::DeclScope);
2823
2824  bool IsVariadic = false;
2825  SourceLocation EllipsisLoc;
2826  while (1) {
2827    if (Tok.is(tok::ellipsis)) {
2828      IsVariadic = true;
2829      EllipsisLoc = ConsumeToken();     // Consume the ellipsis.
2830      break;
2831    }
2832
2833    SourceLocation DSStart = Tok.getLocation();
2834
2835    // Parse the declaration-specifiers.
2836    // Just use the ParsingDeclaration "scope" of the declarator.
2837    DeclSpec DS;
2838
2839    // If the caller parsed attributes for the first argument, add them now.
2840    if (AttrList) {
2841      DS.AddAttributes(AttrList);
2842      AttrList = 0;  // Only apply the attributes to the first parameter.
2843    }
2844    ParseDeclarationSpecifiers(DS);
2845
2846    // Parse the declarator.  This is "PrototypeContext", because we must
2847    // accept either 'declarator' or 'abstract-declarator' here.
2848    Declarator ParmDecl(DS, Declarator::PrototypeContext);
2849    ParseDeclarator(ParmDecl);
2850
2851    // Parse GNU attributes, if present.
2852    if (Tok.is(tok::kw___attribute)) {
2853      SourceLocation Loc;
2854      AttributeList *AttrList = ParseGNUAttributes(&Loc);
2855      ParmDecl.AddAttributes(AttrList, Loc);
2856    }
2857
2858    // Remember this parsed parameter in ParamInfo.
2859    IdentifierInfo *ParmII = ParmDecl.getIdentifier();
2860
2861    // DefArgToks is used when the parsing of default arguments needs
2862    // to be delayed.
2863    CachedTokens *DefArgToks = 0;
2864
2865    // If no parameter was specified, verify that *something* was specified,
2866    // otherwise we have a missing type and identifier.
2867    if (DS.isEmpty() && ParmDecl.getIdentifier() == 0 &&
2868        ParmDecl.getNumTypeObjects() == 0) {
2869      // Completely missing, emit error.
2870      Diag(DSStart, diag::err_missing_param);
2871    } else {
2872      // Otherwise, we have something.  Add it and let semantic analysis try
2873      // to grok it and add the result to the ParamInfo we are building.
2874
2875      // Inform the actions module about the parameter declarator, so it gets
2876      // added to the current scope.
2877      DeclPtrTy Param = Actions.ActOnParamDeclarator(CurScope, ParmDecl);
2878
2879      // Parse the default argument, if any. We parse the default
2880      // arguments in all dialects; the semantic analysis in
2881      // ActOnParamDefaultArgument will reject the default argument in
2882      // C.
2883      if (Tok.is(tok::equal)) {
2884        SourceLocation EqualLoc = Tok.getLocation();
2885
2886        // Parse the default argument
2887        if (D.getContext() == Declarator::MemberContext) {
2888          // If we're inside a class definition, cache the tokens
2889          // corresponding to the default argument. We'll actually parse
2890          // them when we see the end of the class definition.
2891          // FIXME: Templates will require something similar.
2892          // FIXME: Can we use a smart pointer for Toks?
2893          DefArgToks = new CachedTokens;
2894
2895          if (!ConsumeAndStoreUntil(tok::comma, tok::r_paren, *DefArgToks,
2896                                    tok::semi, false)) {
2897            delete DefArgToks;
2898            DefArgToks = 0;
2899            Actions.ActOnParamDefaultArgumentError(Param);
2900          } else
2901            Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc,
2902                                                (*DefArgToks)[1].getLocation());
2903        } else {
2904          // Consume the '='.
2905          ConsumeToken();
2906
2907          OwningExprResult DefArgResult(ParseAssignmentExpression());
2908          if (DefArgResult.isInvalid()) {
2909            Actions.ActOnParamDefaultArgumentError(Param);
2910            SkipUntil(tok::comma, tok::r_paren, true, true);
2911          } else {
2912            // Inform the actions module about the default argument
2913            Actions.ActOnParamDefaultArgument(Param, EqualLoc,
2914                                              move(DefArgResult));
2915          }
2916        }
2917      }
2918
2919      ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
2920                                          ParmDecl.getIdentifierLoc(), Param,
2921                                          DefArgToks));
2922    }
2923
2924    // If the next token is a comma, consume it and keep reading arguments.
2925    if (Tok.isNot(tok::comma)) {
2926      if (Tok.is(tok::ellipsis)) {
2927        IsVariadic = true;
2928        EllipsisLoc = ConsumeToken();     // Consume the ellipsis.
2929
2930        if (!getLang().CPlusPlus) {
2931          // We have ellipsis without a preceding ',', which is ill-formed
2932          // in C. Complain and provide the fix.
2933          Diag(EllipsisLoc, diag::err_missing_comma_before_ellipsis)
2934            << CodeModificationHint::CreateInsertion(EllipsisLoc, ", ");
2935        }
2936      }
2937
2938      break;
2939    }
2940
2941    // Consume the comma.
2942    ConsumeToken();
2943  }
2944
2945  // Leave prototype scope.
2946  PrototypeScope.Exit();
2947
2948  // If we have the closing ')', eat it.
2949  SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2950  SourceLocation EndLoc = RParenLoc;
2951
2952  DeclSpec DS;
2953  bool hasExceptionSpec = false;
2954  SourceLocation ThrowLoc;
2955  bool hasAnyExceptionSpec = false;
2956  llvm::SmallVector<TypeTy*, 2> Exceptions;
2957  llvm::SmallVector<SourceRange, 2> ExceptionRanges;
2958
2959  if (getLang().CPlusPlus) {
2960    // Parse cv-qualifier-seq[opt].
2961    ParseTypeQualifierListOpt(DS, false /*no attributes*/);
2962      if (!DS.getSourceRange().getEnd().isInvalid())
2963        EndLoc = DS.getSourceRange().getEnd();
2964
2965    // Parse exception-specification[opt].
2966    if (Tok.is(tok::kw_throw)) {
2967      hasExceptionSpec = true;
2968      ThrowLoc = Tok.getLocation();
2969      ParseExceptionSpecification(EndLoc, Exceptions, ExceptionRanges,
2970                                  hasAnyExceptionSpec);
2971      assert(Exceptions.size() == ExceptionRanges.size() &&
2972             "Produced different number of exception types and ranges.");
2973    }
2974  }
2975
2976  // Remember that we parsed a function type, and remember the attributes.
2977  D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/true, IsVariadic,
2978                                             EllipsisLoc,
2979                                             ParamInfo.data(), ParamInfo.size(),
2980                                             DS.getTypeQualifiers(),
2981                                             hasExceptionSpec, ThrowLoc,
2982                                             hasAnyExceptionSpec,
2983                                             Exceptions.data(),
2984                                             ExceptionRanges.data(),
2985                                             Exceptions.size(),
2986                                             LParenLoc, RParenLoc, D),
2987                EndLoc);
2988}
2989
2990/// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator
2991/// we found a K&R-style identifier list instead of a type argument list.  The
2992/// current token is known to be the first identifier in the list.
2993///
2994///       identifier-list: [C99 6.7.5]
2995///         identifier
2996///         identifier-list ',' identifier
2997///
2998void Parser::ParseFunctionDeclaratorIdentifierList(SourceLocation LParenLoc,
2999                                                   Declarator &D) {
3000  // Build up an array of information about the parsed arguments.
3001  llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
3002  llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar;
3003
3004  // If there was no identifier specified for the declarator, either we are in
3005  // an abstract-declarator, or we are in a parameter declarator which was found
3006  // to be abstract.  In abstract-declarators, identifier lists are not valid:
3007  // diagnose this.
3008  if (!D.getIdentifier())
3009    Diag(Tok, diag::ext_ident_list_in_param);
3010
3011  // Tok is known to be the first identifier in the list.  Remember this
3012  // identifier in ParamInfo.
3013  ParamsSoFar.insert(Tok.getIdentifierInfo());
3014  ParamInfo.push_back(DeclaratorChunk::ParamInfo(Tok.getIdentifierInfo(),
3015                                                 Tok.getLocation(),
3016                                                 DeclPtrTy()));
3017
3018  ConsumeToken();  // eat the first identifier.
3019
3020  while (Tok.is(tok::comma)) {
3021    // Eat the comma.
3022    ConsumeToken();
3023
3024    // If this isn't an identifier, report the error and skip until ')'.
3025    if (Tok.isNot(tok::identifier)) {
3026      Diag(Tok, diag::err_expected_ident);
3027      SkipUntil(tok::r_paren);
3028      return;
3029    }
3030
3031    IdentifierInfo *ParmII = Tok.getIdentifierInfo();
3032
3033    // Reject 'typedef int y; int test(x, y)', but continue parsing.
3034    if (Actions.getTypeName(*ParmII, Tok.getLocation(), CurScope))
3035      Diag(Tok, diag::err_unexpected_typedef_ident) << ParmII;
3036
3037    // Verify that the argument identifier has not already been mentioned.
3038    if (!ParamsSoFar.insert(ParmII)) {
3039      Diag(Tok, diag::err_param_redefinition) << ParmII;
3040    } else {
3041      // Remember this identifier in ParamInfo.
3042      ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
3043                                                     Tok.getLocation(),
3044                                                     DeclPtrTy()));
3045    }
3046
3047    // Eat the identifier.
3048    ConsumeToken();
3049  }
3050
3051  // If we have the closing ')', eat it and we're done.
3052  SourceLocation RLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
3053
3054  // Remember that we parsed a function type, and remember the attributes.  This
3055  // function type is always a K&R style function type, which is not varargs and
3056  // has no prototype.
3057  D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/false, /*varargs*/false,
3058                                             SourceLocation(),
3059                                             &ParamInfo[0], ParamInfo.size(),
3060                                             /*TypeQuals*/0,
3061                                             /*exception*/false,
3062                                             SourceLocation(), false, 0, 0, 0,
3063                                             LParenLoc, RLoc, D),
3064                RLoc);
3065}
3066
3067/// [C90]   direct-declarator '[' constant-expression[opt] ']'
3068/// [C99]   direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
3069/// [C99]   direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
3070/// [C99]   direct-declarator '[' type-qual-list 'static' assignment-expr ']'
3071/// [C99]   direct-declarator '[' type-qual-list[opt] '*' ']'
3072void Parser::ParseBracketDeclarator(Declarator &D) {
3073  SourceLocation StartLoc = ConsumeBracket();
3074
3075  // C array syntax has many features, but by-far the most common is [] and [4].
3076  // This code does a fast path to handle some of the most obvious cases.
3077  if (Tok.getKind() == tok::r_square) {
3078    SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
3079    //FIXME: Use these
3080    CXX0XAttributeList Attr;
3081    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier(true)) {
3082      Attr = ParseCXX0XAttributes();
3083    }
3084
3085    // Remember that we parsed the empty array type.
3086    OwningExprResult NumElements(Actions);
3087    D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, 0,
3088                                            StartLoc, EndLoc),
3089                  EndLoc);
3090    return;
3091  } else if (Tok.getKind() == tok::numeric_constant &&
3092             GetLookAheadToken(1).is(tok::r_square)) {
3093    // [4] is very common.  Parse the numeric constant expression.
3094    OwningExprResult ExprRes(Actions.ActOnNumericConstant(Tok));
3095    ConsumeToken();
3096
3097    SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
3098    //FIXME: Use these
3099    CXX0XAttributeList Attr;
3100    if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
3101      Attr = ParseCXX0XAttributes();
3102    }
3103
3104    // If there was an error parsing the assignment-expression, recover.
3105    if (ExprRes.isInvalid())
3106      ExprRes.release();  // Deallocate expr, just use [].
3107
3108    // Remember that we parsed a array type, and remember its features.
3109    D.AddTypeInfo(DeclaratorChunk::getArray(0, false, 0, ExprRes.release(),
3110                                            StartLoc, EndLoc),
3111                  EndLoc);
3112    return;
3113  }
3114
3115  // If valid, this location is the position where we read the 'static' keyword.
3116  SourceLocation StaticLoc;
3117  if (Tok.is(tok::kw_static))
3118    StaticLoc = ConsumeToken();
3119
3120  // If there is a type-qualifier-list, read it now.
3121  // Type qualifiers in an array subscript are a C99 feature.
3122  DeclSpec DS;
3123  ParseTypeQualifierListOpt(DS, false /*no attributes*/);
3124
3125  // If we haven't already read 'static', check to see if there is one after the
3126  // type-qualifier-list.
3127  if (!StaticLoc.isValid() && Tok.is(tok::kw_static))
3128    StaticLoc = ConsumeToken();
3129
3130  // Handle "direct-declarator [ type-qual-list[opt] * ]".
3131  bool isStar = false;
3132  OwningExprResult NumElements(Actions);
3133
3134  // Handle the case where we have '[*]' as the array size.  However, a leading
3135  // star could be the start of an expression, for example 'X[*p + 4]'.  Verify
3136  // the the token after the star is a ']'.  Since stars in arrays are
3137  // infrequent, use of lookahead is not costly here.
3138  if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) {
3139    ConsumeToken();  // Eat the '*'.
3140
3141    if (StaticLoc.isValid()) {
3142      Diag(StaticLoc, diag::err_unspecified_vla_size_with_static);
3143      StaticLoc = SourceLocation();  // Drop the static.
3144    }
3145    isStar = true;
3146  } else if (Tok.isNot(tok::r_square)) {
3147    // Note, in C89, this production uses the constant-expr production instead
3148    // of assignment-expr.  The only difference is that assignment-expr allows
3149    // things like '=' and '*='.  Sema rejects these in C89 mode because they
3150    // are not i-c-e's, so we don't need to distinguish between the two here.
3151
3152    // Parse the constant-expression or assignment-expression now (depending
3153    // on dialect).
3154    if (getLang().CPlusPlus)
3155      NumElements = ParseConstantExpression();
3156    else
3157      NumElements = ParseAssignmentExpression();
3158  }
3159
3160  // If there was an error parsing the assignment-expression, recover.
3161  if (NumElements.isInvalid()) {
3162    D.setInvalidType(true);
3163    // If the expression was invalid, skip it.
3164    SkipUntil(tok::r_square);
3165    return;
3166  }
3167
3168  SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
3169
3170  //FIXME: Use these
3171  CXX0XAttributeList Attr;
3172  if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
3173    Attr = ParseCXX0XAttributes();
3174  }
3175
3176  // Remember that we parsed a array type, and remember its features.
3177  D.AddTypeInfo(DeclaratorChunk::getArray(DS.getTypeQualifiers(),
3178                                          StaticLoc.isValid(), isStar,
3179                                          NumElements.release(),
3180                                          StartLoc, EndLoc),
3181                EndLoc);
3182}
3183
3184/// [GNU]   typeof-specifier:
3185///           typeof ( expressions )
3186///           typeof ( type-name )
3187/// [GNU/C++] typeof unary-expression
3188///
3189void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
3190  assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier");
3191  Token OpTok = Tok;
3192  SourceLocation StartLoc = ConsumeToken();
3193
3194  const bool hasParens = Tok.is(tok::l_paren);
3195
3196  bool isCastExpr;
3197  TypeTy *CastTy;
3198  SourceRange CastRange;
3199  OwningExprResult Operand = ParseExprAfterTypeofSizeofAlignof(OpTok,
3200                                                               isCastExpr,
3201                                                               CastTy,
3202                                                               CastRange);
3203  if (hasParens)
3204    DS.setTypeofParensRange(CastRange);
3205
3206  if (CastRange.getEnd().isInvalid())
3207    // FIXME: Not accurate, the range gets one token more than it should.
3208    DS.SetRangeEnd(Tok.getLocation());
3209  else
3210    DS.SetRangeEnd(CastRange.getEnd());
3211
3212  if (isCastExpr) {
3213    if (!CastTy) {
3214      DS.SetTypeSpecError();
3215      return;
3216    }
3217
3218    const char *PrevSpec = 0;
3219    unsigned DiagID;
3220    // Check for duplicate type specifiers (e.g. "int typeof(int)").
3221    if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec,
3222                           DiagID, CastTy))
3223      Diag(StartLoc, DiagID) << PrevSpec;
3224    return;
3225  }
3226
3227  // If we get here, the operand to the typeof was an expresion.
3228  if (Operand.isInvalid()) {
3229    DS.SetTypeSpecError();
3230    return;
3231  }
3232
3233  const char *PrevSpec = 0;
3234  unsigned DiagID;
3235  // Check for duplicate type specifiers (e.g. "int typeof(int)").
3236  if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
3237                         DiagID, Operand.release()))
3238    Diag(StartLoc, DiagID) << PrevSpec;
3239}
3240