ParseDecl.cpp revision e4e5b054b4917f0ee493bb2fda5b1ec749bfb9a1 
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 "ExtensionRAIIObject.h"
18#include "AstGuard.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() {
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
40  if (DeclaratorInfo.getInvalidType())
41    return true;
42
43  return Actions.ActOnTypeName(CurScope, DeclaratorInfo);
44}
45
46/// ParseAttributes - Parse a non-empty attributes list.
47///
48/// [GNU] attributes:
49///         attribute
50///         attributes attribute
51///
52/// [GNU]  attribute:
53///          '__attribute__' '(' '(' attribute-list ')' ')'
54///
55/// [GNU]  attribute-list:
56///          attrib
57///          attribute_list ',' attrib
58///
59/// [GNU]  attrib:
60///          empty
61///          attrib-name
62///          attrib-name '(' identifier ')'
63///          attrib-name '(' identifier ',' nonempty-expr-list ')'
64///          attrib-name '(' argument-expression-list [C99 6.5.2] ')'
65///
66/// [GNU]  attrib-name:
67///          identifier
68///          typespec
69///          typequal
70///          storageclass
71///
72/// FIXME: The GCC grammar/code for this construct implies we need two
73/// token lookahead. Comment from gcc: "If they start with an identifier
74/// which is followed by a comma or close parenthesis, then the arguments
75/// start with that identifier; otherwise they are an expression list."
76///
77/// At the moment, I am not doing 2 token lookahead. I am also unaware of
78/// any attributes that don't work (based on my limited testing). Most
79/// attributes are very simple in practice. Until we find a bug, I don't see
80/// a pressing need to implement the 2 token lookahead.
81
82AttributeList *Parser::ParseAttributes(SourceLocation *EndLoc) {
83  assert(Tok.is(tok::kw___attribute) && "Not an attribute list!");
84
85  AttributeList *CurrAttr = 0;
86
87  while (Tok.is(tok::kw___attribute)) {
88    ConsumeToken();
89    if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
90                         "attribute")) {
91      SkipUntil(tok::r_paren, true); // skip until ) or ;
92      return CurrAttr;
93    }
94    if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
95      SkipUntil(tok::r_paren, true); // skip until ) or ;
96      return CurrAttr;
97    }
98    // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
99    while (Tok.is(tok::identifier) || isDeclarationSpecifier() ||
100           Tok.is(tok::comma)) {
101
102      if (Tok.is(tok::comma)) {
103        // allows for empty/non-empty attributes. ((__vector_size__(16),,,,))
104        ConsumeToken();
105        continue;
106      }
107      // we have an identifier or declaration specifier (const, int, etc.)
108      IdentifierInfo *AttrName = Tok.getIdentifierInfo();
109      SourceLocation AttrNameLoc = ConsumeToken();
110
111      // check if we have a "paramterized" attribute
112      if (Tok.is(tok::l_paren)) {
113        ConsumeParen(); // ignore the left paren loc for now
114
115        if (Tok.is(tok::identifier)) {
116          IdentifierInfo *ParmName = Tok.getIdentifierInfo();
117          SourceLocation ParmLoc = ConsumeToken();
118
119          if (Tok.is(tok::r_paren)) {
120            // __attribute__(( mode(byte) ))
121            ConsumeParen(); // ignore the right paren loc for now
122            CurrAttr = new AttributeList(AttrName, AttrNameLoc,
123                                         ParmName, ParmLoc, 0, 0, CurrAttr);
124          } else if (Tok.is(tok::comma)) {
125            ConsumeToken();
126            // __attribute__(( format(printf, 1, 2) ))
127            ExprVector ArgExprs(Actions);
128            bool ArgExprsOk = true;
129
130            // now parse the non-empty comma separated list of expressions
131            while (1) {
132              OwningExprResult ArgExpr(ParseAssignmentExpression());
133              if (ArgExpr.isInvalid()) {
134                ArgExprsOk = false;
135                SkipUntil(tok::r_paren);
136                break;
137              } else {
138                ArgExprs.push_back(ArgExpr.release());
139              }
140              if (Tok.isNot(tok::comma))
141                break;
142              ConsumeToken(); // Eat the comma, move to the next argument
143            }
144            if (ArgExprsOk && Tok.is(tok::r_paren)) {
145              ConsumeParen(); // ignore the right paren loc for now
146              CurrAttr = new AttributeList(AttrName, AttrNameLoc, ParmName,
147                           ParmLoc, ArgExprs.take(), ArgExprs.size(), CurrAttr);
148            }
149          }
150        } else { // not an identifier
151          // parse a possibly empty comma separated list of expressions
152          if (Tok.is(tok::r_paren)) {
153            // __attribute__(( nonnull() ))
154            ConsumeParen(); // ignore the right paren loc for now
155            CurrAttr = new AttributeList(AttrName, AttrNameLoc,
156                                         0, SourceLocation(), 0, 0, CurrAttr);
157          } else {
158            // __attribute__(( aligned(16) ))
159            ExprVector ArgExprs(Actions);
160            bool ArgExprsOk = true;
161
162            // now parse the list of expressions
163            while (1) {
164              OwningExprResult ArgExpr(ParseAssignmentExpression());
165              if (ArgExpr.isInvalid()) {
166                ArgExprsOk = false;
167                SkipUntil(tok::r_paren);
168                break;
169              } else {
170                ArgExprs.push_back(ArgExpr.release());
171              }
172              if (Tok.isNot(tok::comma))
173                break;
174              ConsumeToken(); // Eat the comma, move to the next argument
175            }
176            // Match the ')'.
177            if (ArgExprsOk && Tok.is(tok::r_paren)) {
178              ConsumeParen(); // ignore the right paren loc for now
179              CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0,
180                           SourceLocation(), ArgExprs.take(), ArgExprs.size(),
181                           CurrAttr);
182            }
183          }
184        }
185      } else {
186        CurrAttr = new AttributeList(AttrName, AttrNameLoc,
187                                     0, SourceLocation(), 0, 0, CurrAttr);
188      }
189    }
190    if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen))
191      SkipUntil(tok::r_paren, false);
192    SourceLocation Loc = Tok.getLocation();;
193    if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen)) {
194      SkipUntil(tok::r_paren, false);
195    }
196    if (EndLoc)
197      *EndLoc = Loc;
198  }
199  return CurrAttr;
200}
201
202/// FuzzyParseMicrosoftDeclSpec. When -fms-extensions is enabled, this
203/// routine is called to skip/ignore tokens that comprise the MS declspec.
204void Parser::FuzzyParseMicrosoftDeclSpec() {
205  assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
206  ConsumeToken();
207  if (Tok.is(tok::l_paren)) {
208    unsigned short savedParenCount = ParenCount;
209    do {
210      ConsumeAnyToken();
211    } while (ParenCount > savedParenCount && Tok.isNot(tok::eof));
212  }
213  return;
214}
215
216/// ParseDeclaration - Parse a full 'declaration', which consists of
217/// declaration-specifiers, some number of declarators, and a semicolon.
218/// 'Context' should be a Declarator::TheContext value.
219///
220///       declaration: [C99 6.7]
221///         block-declaration ->
222///           simple-declaration
223///           others                   [FIXME]
224/// [C++]   template-declaration
225/// [C++]   namespace-definition
226/// [C++]   using-directive
227/// [C++]   using-declaration [TODO]
228//  [C++0x] static_assert-declaration
229///         others... [FIXME]
230///
231Parser::DeclTy *Parser::ParseDeclaration(unsigned Context) {
232  switch (Tok.getKind()) {
233  case tok::kw_export:
234  case tok::kw_template:
235    return ParseTemplateDeclarationOrSpecialization(Context);
236  case tok::kw_namespace:
237    return ParseNamespace(Context);
238  case tok::kw_using:
239    return ParseUsingDirectiveOrDeclaration(Context);
240  case tok::kw_static_assert:
241    return ParseStaticAssertDeclaration();
242  default:
243    return ParseSimpleDeclaration(Context);
244  }
245}
246
247///       simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
248///         declaration-specifiers init-declarator-list[opt] ';'
249///[C90/C++]init-declarator-list ';'                             [TODO]
250/// [OMP]   threadprivate-directive                              [TODO]
251Parser::DeclTy *Parser::ParseSimpleDeclaration(unsigned Context) {
252  // Parse the common declaration-specifiers piece.
253  DeclSpec DS;
254  ParseDeclarationSpecifiers(DS);
255
256  // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
257  // declaration-specifiers init-declarator-list[opt] ';'
258  if (Tok.is(tok::semi)) {
259    ConsumeToken();
260    return Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
261  }
262
263  Declarator DeclaratorInfo(DS, (Declarator::TheContext)Context);
264  ParseDeclarator(DeclaratorInfo);
265
266  return ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo);
267}
268
269
270/// ParseInitDeclaratorListAfterFirstDeclarator - Parse 'declaration' after
271/// parsing 'declaration-specifiers declarator'.  This method is split out this
272/// way to handle the ambiguity between top-level function-definitions and
273/// declarations.
274///
275///       init-declarator-list: [C99 6.7]
276///         init-declarator
277///         init-declarator-list ',' init-declarator
278///       init-declarator: [C99 6.7]
279///         declarator
280///         declarator '=' initializer
281/// [GNU]   declarator simple-asm-expr[opt] attributes[opt]
282/// [GNU]   declarator simple-asm-expr[opt] attributes[opt] '=' initializer
283/// [C++]   declarator initializer[opt]
284///
285/// [C++] initializer:
286/// [C++]   '=' initializer-clause
287/// [C++]   '(' expression-list ')'
288///
289Parser::DeclTy *Parser::
290ParseInitDeclaratorListAfterFirstDeclarator(Declarator &D) {
291
292  // Declarators may be grouped together ("int X, *Y, Z();").  Provide info so
293  // that they can be chained properly if the actions want this.
294  Parser::DeclTy *LastDeclInGroup = 0;
295
296  // At this point, we know that it is not a function definition.  Parse the
297  // rest of the init-declarator-list.
298  while (1) {
299    // If a simple-asm-expr is present, parse it.
300    if (Tok.is(tok::kw_asm)) {
301      SourceLocation Loc;
302      OwningExprResult AsmLabel(ParseSimpleAsm(&Loc));
303      if (AsmLabel.isInvalid()) {
304        SkipUntil(tok::semi);
305        return 0;
306      }
307
308      D.setAsmLabel(AsmLabel.release());
309      D.SetRangeEnd(Loc);
310    }
311
312    // If attributes are present, parse them.
313    if (Tok.is(tok::kw___attribute)) {
314      SourceLocation Loc;
315      AttributeList *AttrList = ParseAttributes(&Loc);
316      D.AddAttributes(AttrList, Loc);
317    }
318
319    // Inform the current actions module that we just parsed this declarator.
320    LastDeclInGroup = Actions.ActOnDeclarator(CurScope, D, LastDeclInGroup);
321
322    // Parse declarator '=' initializer.
323    if (Tok.is(tok::equal)) {
324      ConsumeToken();
325      OwningExprResult Init(ParseInitializer());
326      if (Init.isInvalid()) {
327        SkipUntil(tok::semi);
328        return 0;
329      }
330      Actions.AddInitializerToDecl(LastDeclInGroup, move(Init));
331    } else if (Tok.is(tok::l_paren)) {
332      // Parse C++ direct initializer: '(' expression-list ')'
333      SourceLocation LParenLoc = ConsumeParen();
334      ExprVector Exprs(Actions);
335      CommaLocsTy CommaLocs;
336
337      bool InvalidExpr = false;
338      if (ParseExpressionList(Exprs, CommaLocs)) {
339        SkipUntil(tok::r_paren);
340        InvalidExpr = true;
341      }
342      // Match the ')'.
343      SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
344
345      if (!InvalidExpr) {
346        assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() &&
347               "Unexpected number of commas!");
348        Actions.AddCXXDirectInitializerToDecl(LastDeclInGroup, LParenLoc,
349                                              move_arg(Exprs),
350                                              &CommaLocs[0], RParenLoc);
351      }
352    } else {
353      Actions.ActOnUninitializedDecl(LastDeclInGroup);
354    }
355
356    // If we don't have a comma, it is either the end of the list (a ';') or an
357    // error, bail out.
358    if (Tok.isNot(tok::comma))
359      break;
360
361    // Consume the comma.
362    ConsumeToken();
363
364    // Parse the next declarator.
365    D.clear();
366
367    // Accept attributes in an init-declarator.  In the first declarator in a
368    // declaration, these would be part of the declspec.  In subsequent
369    // declarators, they become part of the declarator itself, so that they
370    // don't apply to declarators after *this* one.  Examples:
371    //    short __attribute__((common)) var;    -> declspec
372    //    short var __attribute__((common));    -> declarator
373    //    short x, __attribute__((common)) var;    -> declarator
374    if (Tok.is(tok::kw___attribute)) {
375      SourceLocation Loc;
376      AttributeList *AttrList = ParseAttributes(&Loc);
377      D.AddAttributes(AttrList, Loc);
378    }
379
380    ParseDeclarator(D);
381  }
382
383  if (Tok.is(tok::semi)) {
384    ConsumeToken();
385    // for(is key; in keys) is error.
386    if (D.getContext()  == Declarator::ForContext && isTokIdentifier_in()) {
387      Diag(Tok, diag::err_parse_error);
388      return 0;
389    }
390    return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
391  }
392  // If this is an ObjC2 for-each loop, this is a successful declarator
393  // parse.  The syntax for these looks like:
394  // 'for' '(' declaration 'in' expr ')' statement
395  if (D.getContext()  == Declarator::ForContext && isTokIdentifier_in()) {
396    return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup);
397  }
398  Diag(Tok, diag::err_parse_error);
399  // Skip to end of block or statement
400  SkipUntil(tok::r_brace, true, true);
401  if (Tok.is(tok::semi))
402    ConsumeToken();
403  return 0;
404}
405
406/// ParseSpecifierQualifierList
407///        specifier-qualifier-list:
408///          type-specifier specifier-qualifier-list[opt]
409///          type-qualifier specifier-qualifier-list[opt]
410/// [GNU]    attributes     specifier-qualifier-list[opt]
411///
412void Parser::ParseSpecifierQualifierList(DeclSpec &DS) {
413  /// specifier-qualifier-list is a subset of declaration-specifiers.  Just
414  /// parse declaration-specifiers and complain about extra stuff.
415  ParseDeclarationSpecifiers(DS);
416
417  // Validate declspec for type-name.
418  unsigned Specs = DS.getParsedSpecifiers();
419  if (Specs == DeclSpec::PQ_None && !DS.getNumProtocolQualifiers())
420    Diag(Tok, diag::err_typename_requires_specqual);
421
422  // Issue diagnostic and remove storage class if present.
423  if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
424    if (DS.getStorageClassSpecLoc().isValid())
425      Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
426    else
427      Diag(DS.getThreadSpecLoc(), diag::err_typename_invalid_storageclass);
428    DS.ClearStorageClassSpecs();
429  }
430
431  // Issue diagnostic and remove function specfier if present.
432  if (Specs & DeclSpec::PQ_FunctionSpecifier) {
433    if (DS.isInlineSpecified())
434      Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
435    if (DS.isVirtualSpecified())
436      Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec);
437    if (DS.isExplicitSpecified())
438      Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec);
439    DS.ClearFunctionSpecs();
440  }
441}
442
443/// ParseDeclarationSpecifiers
444///       declaration-specifiers: [C99 6.7]
445///         storage-class-specifier declaration-specifiers[opt]
446///         type-specifier declaration-specifiers[opt]
447/// [C99]   function-specifier declaration-specifiers[opt]
448/// [GNU]   attributes declaration-specifiers[opt]
449///
450///       storage-class-specifier: [C99 6.7.1]
451///         'typedef'
452///         'extern'
453///         'static'
454///         'auto'
455///         'register'
456/// [C++]   'mutable'
457/// [GNU]   '__thread'
458///       function-specifier: [C99 6.7.4]
459/// [C99]   'inline'
460/// [C++]   'virtual'
461/// [C++]   'explicit'
462///
463void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
464                                        TemplateParameterLists *TemplateParams){
465  DS.SetRangeStart(Tok.getLocation());
466  while (1) {
467    int isInvalid = false;
468    const char *PrevSpec = 0;
469    SourceLocation Loc = Tok.getLocation();
470
471    switch (Tok.getKind()) {
472    default:
473    DoneWithDeclSpec:
474      // If this is not a declaration specifier token, we're done reading decl
475      // specifiers.  First verify that DeclSpec's are consistent.
476      DS.Finish(Diags, PP.getSourceManager(), getLang());
477      return;
478
479    case tok::coloncolon: // ::foo::bar
480      // Annotate C++ scope specifiers.  If we get one, loop.
481      if (TryAnnotateCXXScopeToken())
482        continue;
483      goto DoneWithDeclSpec;
484
485    case tok::annot_cxxscope: {
486      if (DS.hasTypeSpecifier())
487        goto DoneWithDeclSpec;
488
489      // We are looking for a qualified typename.
490      if (NextToken().isNot(tok::identifier))
491        goto DoneWithDeclSpec;
492
493      CXXScopeSpec SS;
494      SS.setFromAnnotationData(Tok.getAnnotationValue());
495      SS.setRange(Tok.getAnnotationRange());
496
497      // If the next token is the name of the class type that the C++ scope
498      // denotes, followed by a '(', then this is a constructor declaration.
499      // We're done with the decl-specifiers.
500      if (Actions.isCurrentClassName(*NextToken().getIdentifierInfo(),
501                                     CurScope, &SS) &&
502          GetLookAheadToken(2).is(tok::l_paren))
503        goto DoneWithDeclSpec;
504
505      Token Next = NextToken();
506      TypeTy *TypeRep = Actions.getTypeName(*Next.getIdentifierInfo(),
507                                            Next.getLocation(), CurScope, &SS);
508
509      if (TypeRep == 0)
510        goto DoneWithDeclSpec;
511
512      CXXScopeSpec::freeAnnotationData(Tok.getAnnotationValue());
513      ConsumeToken(); // The C++ scope.
514
515      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
516                                     TypeRep);
517      if (isInvalid)
518        break;
519
520      DS.SetRangeEnd(Tok.getLocation());
521      ConsumeToken(); // The typename.
522
523      continue;
524    }
525
526    case tok::annot_typename: {
527      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
528                                     Tok.getAnnotationValue());
529      DS.SetRangeEnd(Tok.getAnnotationEndLoc());
530      ConsumeToken(); // The typename
531
532      // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
533      // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
534      // Objective-C interface.  If we don't have Objective-C or a '<', this is
535      // just a normal reference to a typedef name.
536      if (!Tok.is(tok::less) || !getLang().ObjC1)
537        continue;
538
539      SourceLocation EndProtoLoc;
540      llvm::SmallVector<DeclTy *, 8> ProtocolDecl;
541      ParseObjCProtocolReferences(ProtocolDecl, false, EndProtoLoc);
542      DS.setProtocolQualifiers(&ProtocolDecl[0], ProtocolDecl.size());
543
544      DS.SetRangeEnd(EndProtoLoc);
545      continue;
546    }
547
548      // typedef-name
549    case tok::identifier: {
550      // In C++, check to see if this is a scope specifier like foo::bar::, if
551      // so handle it as such.  This is important for ctor parsing.
552      if (getLang().CPlusPlus && TryAnnotateCXXScopeToken())
553        continue;
554
555      // This identifier can only be a typedef name if we haven't already seen
556      // a type-specifier.  Without this check we misparse:
557      //  typedef int X; struct Y { short X; };  as 'short int'.
558      if (DS.hasTypeSpecifier())
559        goto DoneWithDeclSpec;
560
561      // It has to be available as a typedef too!
562      TypeTy *TypeRep = Actions.getTypeName(*Tok.getIdentifierInfo(),
563                                            Tok.getLocation(), CurScope);
564
565      if (TypeRep == 0)
566        goto DoneWithDeclSpec;
567
568      // C++: If the identifier is actually the name of the class type
569      // being defined and the next token is a '(', then this is a
570      // constructor declaration. We're done with the decl-specifiers
571      // and will treat this token as an identifier.
572      if (getLang().CPlusPlus &&
573          CurScope->isClassScope() &&
574          Actions.isCurrentClassName(*Tok.getIdentifierInfo(), CurScope) &&
575          NextToken().getKind() == tok::l_paren)
576        goto DoneWithDeclSpec;
577
578      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
579                                     TypeRep);
580      if (isInvalid)
581        break;
582
583      DS.SetRangeEnd(Tok.getLocation());
584      ConsumeToken(); // The identifier
585
586      // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
587      // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
588      // Objective-C interface.  If we don't have Objective-C or a '<', this is
589      // just a normal reference to a typedef name.
590      if (!Tok.is(tok::less) || !getLang().ObjC1)
591        continue;
592
593      SourceLocation EndProtoLoc;
594      llvm::SmallVector<DeclTy *, 8> ProtocolDecl;
595      ParseObjCProtocolReferences(ProtocolDecl, false, EndProtoLoc);
596      DS.setProtocolQualifiers(&ProtocolDecl[0], ProtocolDecl.size());
597
598      DS.SetRangeEnd(EndProtoLoc);
599
600      // Need to support trailing type qualifiers (e.g. "id<p> const").
601      // If a type specifier follows, it will be diagnosed elsewhere.
602      continue;
603    }
604
605      // type-name
606    case tok::annot_template_id: {
607      TemplateIdAnnotation *TemplateId
608        = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
609      if (TemplateId->Kind != TNK_Class_template) {
610        // This template-id does not refer to a type name, so we're
611        // done with the type-specifiers.
612        goto DoneWithDeclSpec;
613      }
614
615      // Turn the template-id annotation token into a type annotation
616      // token, then try again to parse it as a type-specifier.
617      if (AnnotateTemplateIdTokenAsType())
618        DS.SetTypeSpecError();
619
620      continue;
621    }
622
623    // GNU attributes support.
624    case tok::kw___attribute:
625      DS.AddAttributes(ParseAttributes());
626      continue;
627
628    // Microsoft declspec support.
629    case tok::kw___declspec:
630      if (!PP.getLangOptions().Microsoft)
631        goto DoneWithDeclSpec;
632      FuzzyParseMicrosoftDeclSpec();
633      continue;
634
635    // Microsoft single token adornments.
636    case tok::kw___forceinline:
637    case tok::kw___w64:
638    case tok::kw___cdecl:
639    case tok::kw___stdcall:
640    case tok::kw___fastcall:
641      if (!PP.getLangOptions().Microsoft)
642        goto DoneWithDeclSpec;
643      // Just ignore it.
644      break;
645
646    // storage-class-specifier
647    case tok::kw_typedef:
648      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_typedef, Loc, PrevSpec);
649      break;
650    case tok::kw_extern:
651      if (DS.isThreadSpecified())
652        Diag(Tok, diag::ext_thread_before) << "extern";
653      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_extern, Loc, PrevSpec);
654      break;
655    case tok::kw___private_extern__:
656      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_private_extern, Loc,
657                                         PrevSpec);
658      break;
659    case tok::kw_static:
660      if (DS.isThreadSpecified())
661        Diag(Tok, diag::ext_thread_before) << "static";
662      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_static, Loc, PrevSpec);
663      break;
664    case tok::kw_auto:
665      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_auto, Loc, PrevSpec);
666      break;
667    case tok::kw_register:
668      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_register, Loc, PrevSpec);
669      break;
670    case tok::kw_mutable:
671      isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_mutable, Loc, PrevSpec);
672      break;
673    case tok::kw___thread:
674      isInvalid = DS.SetStorageClassSpecThread(Loc, PrevSpec)*2;
675      break;
676
677      continue;
678
679    // function-specifier
680    case tok::kw_inline:
681      isInvalid = DS.SetFunctionSpecInline(Loc, PrevSpec);
682      break;
683    case tok::kw_virtual:
684      isInvalid = DS.SetFunctionSpecVirtual(Loc, PrevSpec);
685      break;
686    case tok::kw_explicit:
687      isInvalid = DS.SetFunctionSpecExplicit(Loc, PrevSpec);
688      break;
689
690    // type-specifier
691    case tok::kw_short:
692      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec);
693      break;
694    case tok::kw_long:
695      if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
696        isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec);
697      else
698        isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec);
699      break;
700    case tok::kw_signed:
701      isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec);
702      break;
703    case tok::kw_unsigned:
704      isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec);
705      break;
706    case tok::kw__Complex:
707      isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec);
708      break;
709    case tok::kw__Imaginary:
710      isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec);
711      break;
712    case tok::kw_void:
713      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec);
714      break;
715    case tok::kw_char:
716      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec);
717      break;
718    case tok::kw_int:
719      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec);
720      break;
721    case tok::kw_float:
722      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec);
723      break;
724    case tok::kw_double:
725      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec);
726      break;
727    case tok::kw_wchar_t:
728      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec);
729      break;
730    case tok::kw_bool:
731    case tok::kw__Bool:
732      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec);
733      break;
734    case tok::kw__Decimal32:
735      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec);
736      break;
737    case tok::kw__Decimal64:
738      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec);
739      break;
740    case tok::kw__Decimal128:
741      isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec);
742      break;
743
744    // class-specifier:
745    case tok::kw_class:
746    case tok::kw_struct:
747    case tok::kw_union:
748      ParseClassSpecifier(DS, TemplateParams);
749      continue;
750
751    // enum-specifier:
752    case tok::kw_enum:
753      ParseEnumSpecifier(DS);
754      continue;
755
756    // cv-qualifier:
757    case tok::kw_const:
758      isInvalid = DS.SetTypeQual(DeclSpec::TQ_const, Loc, PrevSpec,getLang())*2;
759      break;
760    case tok::kw_volatile:
761      isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
762                                 getLang())*2;
763      break;
764    case tok::kw_restrict:
765      isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
766                                 getLang())*2;
767      break;
768
769    // GNU typeof support.
770    case tok::kw_typeof:
771      ParseTypeofSpecifier(DS);
772      continue;
773
774    case tok::less:
775      // GCC ObjC supports types like "<SomeProtocol>" as a synonym for
776      // "id<SomeProtocol>".  This is hopelessly old fashioned and dangerous,
777      // but we support it.
778      if (DS.hasTypeSpecifier() || !getLang().ObjC1)
779        goto DoneWithDeclSpec;
780
781      {
782        SourceLocation EndProtoLoc;
783        llvm::SmallVector<DeclTy *, 8> ProtocolDecl;
784        ParseObjCProtocolReferences(ProtocolDecl, false, EndProtoLoc);
785        DS.setProtocolQualifiers(&ProtocolDecl[0], ProtocolDecl.size());
786        DS.SetRangeEnd(EndProtoLoc);
787
788        Diag(Loc, diag::warn_objc_protocol_qualifier_missing_id)
789          << SourceRange(Loc, EndProtoLoc);
790        // Need to support trailing type qualifiers (e.g. "id<p> const").
791        // If a type specifier follows, it will be diagnosed elsewhere.
792        continue;
793      }
794    }
795    // If the specifier combination wasn't legal, issue a diagnostic.
796    if (isInvalid) {
797      assert(PrevSpec && "Method did not return previous specifier!");
798      // Pick between error or extwarn.
799      unsigned DiagID = isInvalid == 1 ? diag::err_invalid_decl_spec_combination
800                                       : diag::ext_duplicate_declspec;
801      Diag(Tok, DiagID) << PrevSpec;
802    }
803    DS.SetRangeEnd(Tok.getLocation());
804    ConsumeToken();
805  }
806}
807
808/// ParseOptionalTypeSpecifier - Try to parse a single type-specifier. We
809/// primarily follow the C++ grammar with additions for C99 and GNU,
810/// which together subsume the C grammar. Note that the C++
811/// type-specifier also includes the C type-qualifier (for const,
812/// volatile, and C99 restrict). Returns true if a type-specifier was
813/// found (and parsed), false otherwise.
814///
815///       type-specifier: [C++ 7.1.5]
816///         simple-type-specifier
817///         class-specifier
818///         enum-specifier
819///         elaborated-type-specifier  [TODO]
820///         cv-qualifier
821///
822///       cv-qualifier: [C++ 7.1.5.1]
823///         'const'
824///         'volatile'
825/// [C99]   'restrict'
826///
827///       simple-type-specifier: [ C++ 7.1.5.2]
828///         '::'[opt] nested-name-specifier[opt] type-name [TODO]
829///         '::'[opt] nested-name-specifier 'template' template-id [TODO]
830///         'char'
831///         'wchar_t'
832///         'bool'
833///         'short'
834///         'int'
835///         'long'
836///         'signed'
837///         'unsigned'
838///         'float'
839///         'double'
840///         'void'
841/// [C99]   '_Bool'
842/// [C99]   '_Complex'
843/// [C99]   '_Imaginary'  // Removed in TC2?
844/// [GNU]   '_Decimal32'
845/// [GNU]   '_Decimal64'
846/// [GNU]   '_Decimal128'
847/// [GNU]   typeof-specifier
848/// [OBJC]  class-name objc-protocol-refs[opt]    [TODO]
849/// [OBJC]  typedef-name objc-protocol-refs[opt]  [TODO]
850bool Parser::ParseOptionalTypeSpecifier(DeclSpec &DS, int& isInvalid,
851                                        const char *&PrevSpec,
852                                        TemplateParameterLists *TemplateParams){
853  SourceLocation Loc = Tok.getLocation();
854
855  switch (Tok.getKind()) {
856  case tok::identifier:   // foo::bar
857    // Annotate typenames and C++ scope specifiers.  If we get one, just
858    // recurse to handle whatever we get.
859    if (TryAnnotateTypeOrScopeToken())
860      return ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec,TemplateParams);
861    // Otherwise, not a type specifier.
862    return false;
863  case tok::coloncolon:   // ::foo::bar
864    if (NextToken().is(tok::kw_new) ||    // ::new
865        NextToken().is(tok::kw_delete))   // ::delete
866      return false;
867
868    // Annotate typenames and C++ scope specifiers.  If we get one, just
869    // recurse to handle whatever we get.
870    if (TryAnnotateTypeOrScopeToken())
871      return ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec,TemplateParams);
872    // Otherwise, not a type specifier.
873    return false;
874
875  // simple-type-specifier:
876  case tok::annot_typename: {
877    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
878                                   Tok.getAnnotationValue());
879    DS.SetRangeEnd(Tok.getAnnotationEndLoc());
880    ConsumeToken(); // The typename
881
882    // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
883    // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
884    // Objective-C interface.  If we don't have Objective-C or a '<', this is
885    // just a normal reference to a typedef name.
886    if (!Tok.is(tok::less) || !getLang().ObjC1)
887      return true;
888
889    SourceLocation EndProtoLoc;
890    llvm::SmallVector<DeclTy *, 8> ProtocolDecl;
891    ParseObjCProtocolReferences(ProtocolDecl, false, EndProtoLoc);
892    DS.setProtocolQualifiers(&ProtocolDecl[0], ProtocolDecl.size());
893
894    DS.SetRangeEnd(EndProtoLoc);
895    return true;
896  }
897
898  case tok::kw_short:
899    isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec);
900    break;
901  case tok::kw_long:
902    if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
903      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec);
904    else
905      isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec);
906    break;
907  case tok::kw_signed:
908    isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec);
909    break;
910  case tok::kw_unsigned:
911    isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec);
912    break;
913  case tok::kw__Complex:
914    isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec);
915    break;
916  case tok::kw__Imaginary:
917    isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec);
918    break;
919  case tok::kw_void:
920    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec);
921    break;
922  case tok::kw_char:
923    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec);
924    break;
925  case tok::kw_int:
926    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec);
927    break;
928  case tok::kw_float:
929    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec);
930    break;
931  case tok::kw_double:
932    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec);
933    break;
934  case tok::kw_wchar_t:
935    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec);
936    break;
937  case tok::kw_bool:
938  case tok::kw__Bool:
939    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec);
940    break;
941  case tok::kw__Decimal32:
942    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec);
943    break;
944  case tok::kw__Decimal64:
945    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec);
946    break;
947  case tok::kw__Decimal128:
948    isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec);
949    break;
950
951  // class-specifier:
952  case tok::kw_class:
953  case tok::kw_struct:
954  case tok::kw_union:
955    ParseClassSpecifier(DS, TemplateParams);
956    return true;
957
958  // enum-specifier:
959  case tok::kw_enum:
960    ParseEnumSpecifier(DS);
961    return true;
962
963  // cv-qualifier:
964  case tok::kw_const:
965    isInvalid = DS.SetTypeQual(DeclSpec::TQ_const   , Loc, PrevSpec,
966                               getLang())*2;
967    break;
968  case tok::kw_volatile:
969    isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
970                               getLang())*2;
971    break;
972  case tok::kw_restrict:
973    isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
974                               getLang())*2;
975    break;
976
977  // GNU typeof support.
978  case tok::kw_typeof:
979    ParseTypeofSpecifier(DS);
980    return true;
981
982  case tok::kw___cdecl:
983  case tok::kw___stdcall:
984  case tok::kw___fastcall:
985    if (!PP.getLangOptions().Microsoft) return false;
986    ConsumeToken();
987    return true;
988
989  default:
990    // Not a type-specifier; do nothing.
991    return false;
992  }
993
994  // If the specifier combination wasn't legal, issue a diagnostic.
995  if (isInvalid) {
996    assert(PrevSpec && "Method did not return previous specifier!");
997    // Pick between error or extwarn.
998    unsigned DiagID = isInvalid == 1 ? diag::err_invalid_decl_spec_combination
999                                     : diag::ext_duplicate_declspec;
1000    Diag(Tok, DiagID) << PrevSpec;
1001  }
1002  DS.SetRangeEnd(Tok.getLocation());
1003  ConsumeToken(); // whatever we parsed above.
1004  return true;
1005}
1006
1007/// ParseStructDeclaration - Parse a struct declaration without the terminating
1008/// semicolon.
1009///
1010///       struct-declaration:
1011///         specifier-qualifier-list struct-declarator-list
1012/// [GNU]   __extension__ struct-declaration
1013/// [GNU]   specifier-qualifier-list
1014///       struct-declarator-list:
1015///         struct-declarator
1016///         struct-declarator-list ',' struct-declarator
1017/// [GNU]   struct-declarator-list ',' attributes[opt] struct-declarator
1018///       struct-declarator:
1019///         declarator
1020/// [GNU]   declarator attributes[opt]
1021///         declarator[opt] ':' constant-expression
1022/// [GNU]   declarator[opt] ':' constant-expression attributes[opt]
1023///
1024void Parser::
1025ParseStructDeclaration(DeclSpec &DS,
1026                       llvm::SmallVectorImpl<FieldDeclarator> &Fields) {
1027  if (Tok.is(tok::kw___extension__)) {
1028    // __extension__ silences extension warnings in the subexpression.
1029    ExtensionRAIIObject O(Diags);  // Use RAII to do this.
1030    ConsumeToken();
1031    return ParseStructDeclaration(DS, Fields);
1032  }
1033
1034  // Parse the common specifier-qualifiers-list piece.
1035  SourceLocation DSStart = Tok.getLocation();
1036  ParseSpecifierQualifierList(DS);
1037
1038  // If there are no declarators, this is a free-standing declaration
1039  // specifier. Let the actions module cope with it.
1040  if (Tok.is(tok::semi)) {
1041    Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
1042    return;
1043  }
1044
1045  // Read struct-declarators until we find the semicolon.
1046  Fields.push_back(FieldDeclarator(DS));
1047  while (1) {
1048    FieldDeclarator &DeclaratorInfo = Fields.back();
1049
1050    /// struct-declarator: declarator
1051    /// struct-declarator: declarator[opt] ':' constant-expression
1052    if (Tok.isNot(tok::colon))
1053      ParseDeclarator(DeclaratorInfo.D);
1054
1055    if (Tok.is(tok::colon)) {
1056      ConsumeToken();
1057      OwningExprResult Res(ParseConstantExpression());
1058      if (Res.isInvalid())
1059        SkipUntil(tok::semi, true, true);
1060      else
1061        DeclaratorInfo.BitfieldSize = Res.release();
1062    }
1063
1064    // If attributes exist after the declarator, parse them.
1065    if (Tok.is(tok::kw___attribute)) {
1066      SourceLocation Loc;
1067      AttributeList *AttrList = ParseAttributes(&Loc);
1068      DeclaratorInfo.D.AddAttributes(AttrList, Loc);
1069    }
1070
1071    // If we don't have a comma, it is either the end of the list (a ';')
1072    // or an error, bail out.
1073    if (Tok.isNot(tok::comma))
1074      return;
1075
1076    // Consume the comma.
1077    ConsumeToken();
1078
1079    // Parse the next declarator.
1080    Fields.push_back(FieldDeclarator(DS));
1081
1082    // Attributes are only allowed on the second declarator.
1083    if (Tok.is(tok::kw___attribute)) {
1084      SourceLocation Loc;
1085      AttributeList *AttrList = ParseAttributes(&Loc);
1086      Fields.back().D.AddAttributes(AttrList, Loc);
1087    }
1088  }
1089}
1090
1091/// ParseStructUnionBody
1092///       struct-contents:
1093///         struct-declaration-list
1094/// [EXT]   empty
1095/// [GNU]   "struct-declaration-list" without terminatoring ';'
1096///       struct-declaration-list:
1097///         struct-declaration
1098///         struct-declaration-list struct-declaration
1099/// [OBC]   '@' 'defs' '(' class-name ')'
1100///
1101void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
1102                                  unsigned TagType, DeclTy *TagDecl) {
1103  PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
1104                                        PP.getSourceManager(),
1105                                        "parsing struct/union body");
1106
1107  SourceLocation LBraceLoc = ConsumeBrace();
1108
1109  ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope);
1110  Actions.ActOnTagStartDefinition(CurScope, TagDecl);
1111
1112  // Empty structs are an extension in C (C99 6.7.2.1p7), but are allowed in
1113  // C++.
1114  if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
1115    Diag(Tok, diag::ext_empty_struct_union_enum)
1116      << DeclSpec::getSpecifierName((DeclSpec::TST)TagType);
1117
1118  llvm::SmallVector<DeclTy*, 32> FieldDecls;
1119  llvm::SmallVector<FieldDeclarator, 8> FieldDeclarators;
1120
1121  // While we still have something to read, read the declarations in the struct.
1122  while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
1123    // Each iteration of this loop reads one struct-declaration.
1124
1125    // Check for extraneous top-level semicolon.
1126    if (Tok.is(tok::semi)) {
1127      Diag(Tok, diag::ext_extra_struct_semi);
1128      ConsumeToken();
1129      continue;
1130    }
1131
1132    // Parse all the comma separated declarators.
1133    DeclSpec DS;
1134    FieldDeclarators.clear();
1135    if (!Tok.is(tok::at)) {
1136      ParseStructDeclaration(DS, FieldDeclarators);
1137
1138      // Convert them all to fields.
1139      for (unsigned i = 0, e = FieldDeclarators.size(); i != e; ++i) {
1140        FieldDeclarator &FD = FieldDeclarators[i];
1141        // Install the declarator into the current TagDecl.
1142        DeclTy *Field = Actions.ActOnField(CurScope, TagDecl,
1143                                           DS.getSourceRange().getBegin(),
1144                                           FD.D, FD.BitfieldSize);
1145        FieldDecls.push_back(Field);
1146      }
1147    } else { // Handle @defs
1148      ConsumeToken();
1149      if (!Tok.isObjCAtKeyword(tok::objc_defs)) {
1150        Diag(Tok, diag::err_unexpected_at);
1151        SkipUntil(tok::semi, true, true);
1152        continue;
1153      }
1154      ConsumeToken();
1155      ExpectAndConsume(tok::l_paren, diag::err_expected_lparen);
1156      if (!Tok.is(tok::identifier)) {
1157        Diag(Tok, diag::err_expected_ident);
1158        SkipUntil(tok::semi, true, true);
1159        continue;
1160      }
1161      llvm::SmallVector<DeclTy*, 16> Fields;
1162      Actions.ActOnDefs(CurScope, TagDecl, Tok.getLocation(),
1163                        Tok.getIdentifierInfo(), Fields);
1164      FieldDecls.insert(FieldDecls.end(), Fields.begin(), Fields.end());
1165      ConsumeToken();
1166      ExpectAndConsume(tok::r_paren, diag::err_expected_rparen);
1167    }
1168
1169    if (Tok.is(tok::semi)) {
1170      ConsumeToken();
1171    } else if (Tok.is(tok::r_brace)) {
1172      Diag(Tok, diag::ext_expected_semi_decl_list);
1173      break;
1174    } else {
1175      Diag(Tok, diag::err_expected_semi_decl_list);
1176      // Skip to end of block or statement
1177      SkipUntil(tok::r_brace, true, true);
1178    }
1179  }
1180
1181  SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1182
1183  AttributeList *AttrList = 0;
1184  // If attributes exist after struct contents, parse them.
1185  if (Tok.is(tok::kw___attribute))
1186    AttrList = ParseAttributes();
1187
1188  Actions.ActOnFields(CurScope,
1189                      RecordLoc,TagDecl,&FieldDecls[0],FieldDecls.size(),
1190                      LBraceLoc, RBraceLoc,
1191                      AttrList);
1192  StructScope.Exit();
1193  Actions.ActOnTagFinishDefinition(CurScope, TagDecl);
1194}
1195
1196
1197/// ParseEnumSpecifier
1198///       enum-specifier: [C99 6.7.2.2]
1199///         'enum' identifier[opt] '{' enumerator-list '}'
1200///[C99/C++]'enum' identifier[opt] '{' enumerator-list ',' '}'
1201/// [GNU]   'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt]
1202///                                                 '}' attributes[opt]
1203///         'enum' identifier
1204/// [GNU]   'enum' attributes[opt] identifier
1205///
1206/// [C++] elaborated-type-specifier:
1207/// [C++]   'enum' '::'[opt] nested-name-specifier[opt] identifier
1208///
1209void Parser::ParseEnumSpecifier(DeclSpec &DS) {
1210  assert(Tok.is(tok::kw_enum) && "Not an enum specifier");
1211  SourceLocation StartLoc = ConsumeToken();
1212
1213  // Parse the tag portion of this.
1214
1215  AttributeList *Attr = 0;
1216  // If attributes exist after tag, parse them.
1217  if (Tok.is(tok::kw___attribute))
1218    Attr = ParseAttributes();
1219
1220  CXXScopeSpec SS;
1221  if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS)) {
1222    if (Tok.isNot(tok::identifier)) {
1223      Diag(Tok, diag::err_expected_ident);
1224      if (Tok.isNot(tok::l_brace)) {
1225        // Has no name and is not a definition.
1226        // Skip the rest of this declarator, up until the comma or semicolon.
1227        SkipUntil(tok::comma, true);
1228        return;
1229      }
1230    }
1231  }
1232
1233  // Must have either 'enum name' or 'enum {...}'.
1234  if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace)) {
1235    Diag(Tok, diag::err_expected_ident_lbrace);
1236
1237    // Skip the rest of this declarator, up until the comma or semicolon.
1238    SkipUntil(tok::comma, true);
1239    return;
1240  }
1241
1242  // If an identifier is present, consume and remember it.
1243  IdentifierInfo *Name = 0;
1244  SourceLocation NameLoc;
1245  if (Tok.is(tok::identifier)) {
1246    Name = Tok.getIdentifierInfo();
1247    NameLoc = ConsumeToken();
1248  }
1249
1250  // There are three options here.  If we have 'enum foo;', then this is a
1251  // forward declaration.  If we have 'enum foo {...' then this is a
1252  // definition. Otherwise we have something like 'enum foo xyz', a reference.
1253  //
1254  // This is needed to handle stuff like this right (C99 6.7.2.3p11):
1255  // enum foo {..};  void bar() { enum foo; }    <- new foo in bar.
1256  // enum foo {..};  void bar() { enum foo x; }  <- use of old foo.
1257  //
1258  Action::TagKind TK;
1259  if (Tok.is(tok::l_brace))
1260    TK = Action::TK_Definition;
1261  else if (Tok.is(tok::semi))
1262    TK = Action::TK_Declaration;
1263  else
1264    TK = Action::TK_Reference;
1265  DeclTy *TagDecl = Actions.ActOnTag(CurScope, DeclSpec::TST_enum, TK, StartLoc,
1266                                     SS, Name, NameLoc, Attr);
1267
1268  if (Tok.is(tok::l_brace))
1269    ParseEnumBody(StartLoc, TagDecl);
1270
1271  // TODO: semantic analysis on the declspec for enums.
1272  const char *PrevSpec = 0;
1273  if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc, PrevSpec, TagDecl))
1274    Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
1275}
1276
1277/// ParseEnumBody - Parse a {} enclosed enumerator-list.
1278///       enumerator-list:
1279///         enumerator
1280///         enumerator-list ',' enumerator
1281///       enumerator:
1282///         enumeration-constant
1283///         enumeration-constant '=' constant-expression
1284///       enumeration-constant:
1285///         identifier
1286///
1287void Parser::ParseEnumBody(SourceLocation StartLoc, DeclTy *EnumDecl) {
1288  // Enter the scope of the enum body and start the definition.
1289  ParseScope EnumScope(this, Scope::DeclScope);
1290  Actions.ActOnTagStartDefinition(CurScope, EnumDecl);
1291
1292  SourceLocation LBraceLoc = ConsumeBrace();
1293
1294  // C does not allow an empty enumerator-list, C++ does [dcl.enum].
1295  if (Tok.is(tok::r_brace) && !getLang().CPlusPlus)
1296    Diag(Tok, diag::ext_empty_struct_union_enum) << "enum";
1297
1298  llvm::SmallVector<DeclTy*, 32> EnumConstantDecls;
1299
1300  DeclTy *LastEnumConstDecl = 0;
1301
1302  // Parse the enumerator-list.
1303  while (Tok.is(tok::identifier)) {
1304    IdentifierInfo *Ident = Tok.getIdentifierInfo();
1305    SourceLocation IdentLoc = ConsumeToken();
1306
1307    SourceLocation EqualLoc;
1308    OwningExprResult AssignedVal(Actions);
1309    if (Tok.is(tok::equal)) {
1310      EqualLoc = ConsumeToken();
1311      AssignedVal = ParseConstantExpression();
1312      if (AssignedVal.isInvalid())
1313        SkipUntil(tok::comma, tok::r_brace, true, true);
1314    }
1315
1316    // Install the enumerator constant into EnumDecl.
1317    DeclTy *EnumConstDecl = Actions.ActOnEnumConstant(CurScope, EnumDecl,
1318                                                      LastEnumConstDecl,
1319                                                      IdentLoc, Ident,
1320                                                      EqualLoc,
1321                                                      AssignedVal.release());
1322    EnumConstantDecls.push_back(EnumConstDecl);
1323    LastEnumConstDecl = EnumConstDecl;
1324
1325    if (Tok.isNot(tok::comma))
1326      break;
1327    SourceLocation CommaLoc = ConsumeToken();
1328
1329    if (Tok.isNot(tok::identifier) && !getLang().C99)
1330      Diag(CommaLoc, diag::ext_c99_enumerator_list_comma);
1331  }
1332
1333  // Eat the }.
1334  MatchRHSPunctuation(tok::r_brace, LBraceLoc);
1335
1336  Actions.ActOnEnumBody(StartLoc, EnumDecl, &EnumConstantDecls[0],
1337                        EnumConstantDecls.size());
1338
1339  DeclTy *AttrList = 0;
1340  // If attributes exist after the identifier list, parse them.
1341  if (Tok.is(tok::kw___attribute))
1342    AttrList = ParseAttributes(); // FIXME: where do they do?
1343
1344  EnumScope.Exit();
1345  Actions.ActOnTagFinishDefinition(CurScope, EnumDecl);
1346}
1347
1348/// isTypeSpecifierQualifier - Return true if the current token could be the
1349/// start of a type-qualifier-list.
1350bool Parser::isTypeQualifier() const {
1351  switch (Tok.getKind()) {
1352  default: return false;
1353    // type-qualifier
1354  case tok::kw_const:
1355  case tok::kw_volatile:
1356  case tok::kw_restrict:
1357    return true;
1358  }
1359}
1360
1361/// isTypeSpecifierQualifier - Return true if the current token could be the
1362/// start of a specifier-qualifier-list.
1363bool Parser::isTypeSpecifierQualifier() {
1364  switch (Tok.getKind()) {
1365  default: return false;
1366
1367  case tok::identifier:   // foo::bar
1368    // Annotate typenames and C++ scope specifiers.  If we get one, just
1369    // recurse to handle whatever we get.
1370    if (TryAnnotateTypeOrScopeToken())
1371      return isTypeSpecifierQualifier();
1372    // Otherwise, not a type specifier.
1373    return false;
1374  case tok::coloncolon:   // ::foo::bar
1375    if (NextToken().is(tok::kw_new) ||    // ::new
1376        NextToken().is(tok::kw_delete))   // ::delete
1377      return false;
1378
1379    // Annotate typenames and C++ scope specifiers.  If we get one, just
1380    // recurse to handle whatever we get.
1381    if (TryAnnotateTypeOrScopeToken())
1382      return isTypeSpecifierQualifier();
1383    // Otherwise, not a type specifier.
1384    return false;
1385
1386    // GNU attributes support.
1387  case tok::kw___attribute:
1388    // GNU typeof support.
1389  case tok::kw_typeof:
1390
1391    // type-specifiers
1392  case tok::kw_short:
1393  case tok::kw_long:
1394  case tok::kw_signed:
1395  case tok::kw_unsigned:
1396  case tok::kw__Complex:
1397  case tok::kw__Imaginary:
1398  case tok::kw_void:
1399  case tok::kw_char:
1400  case tok::kw_wchar_t:
1401  case tok::kw_int:
1402  case tok::kw_float:
1403  case tok::kw_double:
1404  case tok::kw_bool:
1405  case tok::kw__Bool:
1406  case tok::kw__Decimal32:
1407  case tok::kw__Decimal64:
1408  case tok::kw__Decimal128:
1409
1410    // struct-or-union-specifier (C99) or class-specifier (C++)
1411  case tok::kw_class:
1412  case tok::kw_struct:
1413  case tok::kw_union:
1414    // enum-specifier
1415  case tok::kw_enum:
1416
1417    // type-qualifier
1418  case tok::kw_const:
1419  case tok::kw_volatile:
1420  case tok::kw_restrict:
1421
1422    // typedef-name
1423  case tok::annot_typename:
1424    return true;
1425
1426    // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
1427  case tok::less:
1428    return getLang().ObjC1;
1429
1430  case tok::kw___cdecl:
1431  case tok::kw___stdcall:
1432  case tok::kw___fastcall:
1433    return PP.getLangOptions().Microsoft;
1434  }
1435}
1436
1437/// isDeclarationSpecifier() - Return true if the current token is part of a
1438/// declaration specifier.
1439bool Parser::isDeclarationSpecifier() {
1440  switch (Tok.getKind()) {
1441  default: return false;
1442
1443  case tok::identifier:   // foo::bar
1444    // Unfortunate hack to support "Class.factoryMethod" notation.
1445    if (getLang().ObjC1 && NextToken().is(tok::period))
1446      return false;
1447
1448    // Annotate typenames and C++ scope specifiers.  If we get one, just
1449    // recurse to handle whatever we get.
1450    if (TryAnnotateTypeOrScopeToken())
1451      return isDeclarationSpecifier();
1452    // Otherwise, not a declaration specifier.
1453    return false;
1454  case tok::coloncolon:   // ::foo::bar
1455    if (NextToken().is(tok::kw_new) ||    // ::new
1456        NextToken().is(tok::kw_delete))   // ::delete
1457      return false;
1458
1459    // Annotate typenames and C++ scope specifiers.  If we get one, just
1460    // recurse to handle whatever we get.
1461    if (TryAnnotateTypeOrScopeToken())
1462      return isDeclarationSpecifier();
1463    // Otherwise, not a declaration specifier.
1464    return false;
1465
1466    // storage-class-specifier
1467  case tok::kw_typedef:
1468  case tok::kw_extern:
1469  case tok::kw___private_extern__:
1470  case tok::kw_static:
1471  case tok::kw_auto:
1472  case tok::kw_register:
1473  case tok::kw___thread:
1474
1475    // type-specifiers
1476  case tok::kw_short:
1477  case tok::kw_long:
1478  case tok::kw_signed:
1479  case tok::kw_unsigned:
1480  case tok::kw__Complex:
1481  case tok::kw__Imaginary:
1482  case tok::kw_void:
1483  case tok::kw_char:
1484  case tok::kw_wchar_t:
1485  case tok::kw_int:
1486  case tok::kw_float:
1487  case tok::kw_double:
1488  case tok::kw_bool:
1489  case tok::kw__Bool:
1490  case tok::kw__Decimal32:
1491  case tok::kw__Decimal64:
1492  case tok::kw__Decimal128:
1493
1494    // struct-or-union-specifier (C99) or class-specifier (C++)
1495  case tok::kw_class:
1496  case tok::kw_struct:
1497  case tok::kw_union:
1498    // enum-specifier
1499  case tok::kw_enum:
1500
1501    // type-qualifier
1502  case tok::kw_const:
1503  case tok::kw_volatile:
1504  case tok::kw_restrict:
1505
1506    // function-specifier
1507  case tok::kw_inline:
1508  case tok::kw_virtual:
1509  case tok::kw_explicit:
1510
1511    // typedef-name
1512  case tok::annot_typename:
1513
1514    // GNU typeof support.
1515  case tok::kw_typeof:
1516
1517    // GNU attributes.
1518  case tok::kw___attribute:
1519    return true;
1520
1521    // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
1522  case tok::less:
1523    return getLang().ObjC1;
1524
1525  case tok::kw___declspec:
1526  case tok::kw___cdecl:
1527  case tok::kw___stdcall:
1528  case tok::kw___fastcall:
1529    return PP.getLangOptions().Microsoft;
1530  }
1531}
1532
1533
1534/// ParseTypeQualifierListOpt
1535///       type-qualifier-list: [C99 6.7.5]
1536///         type-qualifier
1537/// [GNU]   attributes                        [ only if AttributesAllowed=true ]
1538///         type-qualifier-list type-qualifier
1539/// [GNU]   type-qualifier-list attributes    [ only if AttributesAllowed=true ]
1540///
1541void Parser::ParseTypeQualifierListOpt(DeclSpec &DS, bool AttributesAllowed) {
1542  while (1) {
1543    int isInvalid = false;
1544    const char *PrevSpec = 0;
1545    SourceLocation Loc = Tok.getLocation();
1546
1547    switch (Tok.getKind()) {
1548    case tok::kw_const:
1549      isInvalid = DS.SetTypeQual(DeclSpec::TQ_const   , Loc, PrevSpec,
1550                                 getLang())*2;
1551      break;
1552    case tok::kw_volatile:
1553      isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec,
1554                                 getLang())*2;
1555      break;
1556    case tok::kw_restrict:
1557      isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec,
1558                                 getLang())*2;
1559      break;
1560    case tok::kw___ptr64:
1561    case tok::kw___cdecl:
1562    case tok::kw___stdcall:
1563    case tok::kw___fastcall:
1564      if (!PP.getLangOptions().Microsoft)
1565        goto DoneWithTypeQuals;
1566      // Just ignore it.
1567      break;
1568    case tok::kw___attribute:
1569      if (AttributesAllowed) {
1570        DS.AddAttributes(ParseAttributes());
1571        continue; // do *not* consume the next token!
1572      }
1573      // otherwise, FALL THROUGH!
1574    default:
1575      DoneWithTypeQuals:
1576      // If this is not a type-qualifier token, we're done reading type
1577      // qualifiers.  First verify that DeclSpec's are consistent.
1578      DS.Finish(Diags, PP.getSourceManager(), getLang());
1579      return;
1580    }
1581
1582    // If the specifier combination wasn't legal, issue a diagnostic.
1583    if (isInvalid) {
1584      assert(PrevSpec && "Method did not return previous specifier!");
1585      // Pick between error or extwarn.
1586      unsigned DiagID = isInvalid == 1 ? diag::err_invalid_decl_spec_combination
1587                                      : diag::ext_duplicate_declspec;
1588      Diag(Tok, DiagID) << PrevSpec;
1589    }
1590    ConsumeToken();
1591  }
1592}
1593
1594
1595/// ParseDeclarator - Parse and verify a newly-initialized declarator.
1596///
1597void Parser::ParseDeclarator(Declarator &D) {
1598  /// This implements the 'declarator' production in the C grammar, then checks
1599  /// for well-formedness and issues diagnostics.
1600  ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
1601}
1602
1603/// ParseDeclaratorInternal - Parse a C or C++ declarator. The direct-declarator
1604/// is parsed by the function passed to it. Pass null, and the direct-declarator
1605/// isn't parsed at all, making this function effectively parse the C++
1606/// ptr-operator production.
1607///
1608///       declarator: [C99 6.7.5] [C++ 8p4, dcl.decl]
1609/// [C]     pointer[opt] direct-declarator
1610/// [C++]   direct-declarator
1611/// [C++]   ptr-operator declarator
1612///
1613///       pointer: [C99 6.7.5]
1614///         '*' type-qualifier-list[opt]
1615///         '*' type-qualifier-list[opt] pointer
1616///
1617///       ptr-operator:
1618///         '*' cv-qualifier-seq[opt]
1619///         '&'
1620/// [C++0x] '&&'
1621/// [GNU]   '&' restrict[opt] attributes[opt]
1622/// [GNU?]  '&&' restrict[opt] attributes[opt]
1623///         '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt]
1624void Parser::ParseDeclaratorInternal(Declarator &D,
1625                                     DirectDeclParseFunction DirectDeclParser) {
1626
1627  // C++ member pointers start with a '::' or a nested-name.
1628  // Member pointers get special handling, since there's no place for the
1629  // scope spec in the generic path below.
1630  if ((Tok.is(tok::coloncolon) || Tok.is(tok::identifier) ||
1631       Tok.is(tok::annot_cxxscope)) && getLang().CPlusPlus) {
1632    CXXScopeSpec SS;
1633    if (ParseOptionalCXXScopeSpecifier(SS)) {
1634      if(Tok.isNot(tok::star)) {
1635        // The scope spec really belongs to the direct-declarator.
1636        D.getCXXScopeSpec() = SS;
1637        if (DirectDeclParser)
1638          (this->*DirectDeclParser)(D);
1639        return;
1640      }
1641
1642      SourceLocation Loc = ConsumeToken();
1643      D.SetRangeEnd(Loc);
1644      DeclSpec DS;
1645      ParseTypeQualifierListOpt(DS);
1646      D.ExtendWithDeclSpec(DS);
1647
1648      // Recurse to parse whatever is left.
1649      ParseDeclaratorInternal(D, DirectDeclParser);
1650
1651      // Sema will have to catch (syntactically invalid) pointers into global
1652      // scope. It has to catch pointers into namespace scope anyway.
1653      D.AddTypeInfo(DeclaratorChunk::getMemberPointer(SS,DS.getTypeQualifiers(),
1654                                                      Loc, DS.TakeAttributes()),
1655                    /* Don't replace range end. */SourceLocation());
1656      return;
1657    }
1658  }
1659
1660  tok::TokenKind Kind = Tok.getKind();
1661  // Not a pointer, C++ reference, or block.
1662  if (Kind != tok::star && (Kind != tok::amp || !getLang().CPlusPlus) &&
1663      (Kind != tok::ampamp || !getLang().CPlusPlus0x) &&
1664      (Kind != tok::caret || !getLang().Blocks)) {
1665    if (DirectDeclParser)
1666      (this->*DirectDeclParser)(D);
1667    return;
1668  }
1669
1670  // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference,
1671  // '&&' -> rvalue reference
1672  SourceLocation Loc = ConsumeToken();  // Eat the *, ^ or &.
1673  D.SetRangeEnd(Loc);
1674
1675  if (Kind == tok::star || (Kind == tok::caret && getLang().Blocks)) {
1676    // Is a pointer.
1677    DeclSpec DS;
1678
1679    ParseTypeQualifierListOpt(DS);
1680    D.ExtendWithDeclSpec(DS);
1681
1682    // Recursively parse the declarator.
1683    ParseDeclaratorInternal(D, DirectDeclParser);
1684    if (Kind == tok::star)
1685      // Remember that we parsed a pointer type, and remember the type-quals.
1686      D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc,
1687                                                DS.TakeAttributes()),
1688                    SourceLocation());
1689    else
1690      // Remember that we parsed a Block type, and remember the type-quals.
1691      D.AddTypeInfo(DeclaratorChunk::getBlockPointer(DS.getTypeQualifiers(),
1692                                                     Loc),
1693                    SourceLocation());
1694  } else {
1695    // Is a reference
1696    DeclSpec DS;
1697
1698    // C++ 8.3.2p1: cv-qualified references are ill-formed except when the
1699    // cv-qualifiers are introduced through the use of a typedef or of a
1700    // template type argument, in which case the cv-qualifiers are ignored.
1701    //
1702    // [GNU] Retricted references are allowed.
1703    // [GNU] Attributes on references are allowed.
1704    ParseTypeQualifierListOpt(DS);
1705    D.ExtendWithDeclSpec(DS);
1706
1707    if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
1708      if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
1709        Diag(DS.getConstSpecLoc(),
1710             diag::err_invalid_reference_qualifier_application) << "const";
1711      if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
1712        Diag(DS.getVolatileSpecLoc(),
1713             diag::err_invalid_reference_qualifier_application) << "volatile";
1714    }
1715
1716    // Recursively parse the declarator.
1717    ParseDeclaratorInternal(D, DirectDeclParser);
1718
1719    if (D.getNumTypeObjects() > 0) {
1720      // C++ [dcl.ref]p4: There shall be no references to references.
1721      DeclaratorChunk& InnerChunk = D.getTypeObject(D.getNumTypeObjects() - 1);
1722      if (InnerChunk.Kind == DeclaratorChunk::Reference) {
1723        if (const IdentifierInfo *II = D.getIdentifier())
1724          Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
1725           << II;
1726        else
1727          Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
1728            << "type name";
1729
1730        // Once we've complained about the reference-to-reference, we
1731        // can go ahead and build the (technically ill-formed)
1732        // declarator: reference collapsing will take care of it.
1733      }
1734    }
1735
1736    // Remember that we parsed a reference type. It doesn't have type-quals.
1737    D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc,
1738                                                DS.TakeAttributes(),
1739                                                Kind == tok::amp),
1740                  SourceLocation());
1741  }
1742}
1743
1744/// ParseDirectDeclarator
1745///       direct-declarator: [C99 6.7.5]
1746/// [C99]   identifier
1747///         '(' declarator ')'
1748/// [GNU]   '(' attributes declarator ')'
1749/// [C90]   direct-declarator '[' constant-expression[opt] ']'
1750/// [C99]   direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
1751/// [C99]   direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
1752/// [C99]   direct-declarator '[' type-qual-list 'static' assignment-expr ']'
1753/// [C99]   direct-declarator '[' type-qual-list[opt] '*' ']'
1754///         direct-declarator '(' parameter-type-list ')'
1755///         direct-declarator '(' identifier-list[opt] ')'
1756/// [GNU]   direct-declarator '(' parameter-forward-declarations
1757///                    parameter-type-list[opt] ')'
1758/// [C++]   direct-declarator '(' parameter-declaration-clause ')'
1759///                    cv-qualifier-seq[opt] exception-specification[opt]
1760/// [C++]   declarator-id
1761///
1762///       declarator-id: [C++ 8]
1763///         id-expression
1764///         '::'[opt] nested-name-specifier[opt] type-name
1765///
1766///       id-expression: [C++ 5.1]
1767///         unqualified-id
1768///         qualified-id            [TODO]
1769///
1770///       unqualified-id: [C++ 5.1]
1771///         identifier
1772///         operator-function-id
1773///         conversion-function-id  [TODO]
1774///          '~' class-name
1775///         template-id
1776///
1777void Parser::ParseDirectDeclarator(Declarator &D) {
1778  DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec());
1779
1780  if (getLang().CPlusPlus) {
1781    if (D.mayHaveIdentifier()) {
1782      // ParseDeclaratorInternal might already have parsed the scope.
1783      bool afterCXXScope = D.getCXXScopeSpec().isSet() ||
1784        ParseOptionalCXXScopeSpecifier(D.getCXXScopeSpec());
1785      if (afterCXXScope) {
1786        // Change the declaration context for name lookup, until this function
1787        // is exited (and the declarator has been parsed).
1788        DeclScopeObj.EnterDeclaratorScope();
1789      }
1790
1791      if (Tok.is(tok::identifier)) {
1792        assert(Tok.getIdentifierInfo() && "Not an identifier?");
1793
1794        // If this identifier is the name of the current class, it's a
1795        // constructor name.
1796        if (Actions.isCurrentClassName(*Tok.getIdentifierInfo(),CurScope)){
1797          D.setConstructor(Actions.getTypeName(*Tok.getIdentifierInfo(),
1798                                               Tok.getLocation(), CurScope),
1799                           Tok.getLocation());
1800        // This is a normal identifier.
1801        } else
1802          D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1803        ConsumeToken();
1804        goto PastIdentifier;
1805      } else if (Tok.is(tok::annot_template_id)) {
1806        TemplateIdAnnotation *TemplateId
1807          = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
1808
1809        // FIXME: Could this template-id name a constructor?
1810
1811        // FIXME: This is an egregious hack, where we silently ignore
1812        // the specialization (which should be a function template
1813        // specialization name) and use the name instead. This hack
1814        // will go away when we have support for function
1815        // specializations.
1816        D.SetIdentifier(TemplateId->Name, Tok.getLocation());
1817        TemplateId->Destroy();
1818        ConsumeToken();
1819        goto PastIdentifier;
1820      } else if (Tok.is(tok::kw_operator)) {
1821        SourceLocation OperatorLoc = Tok.getLocation();
1822        SourceLocation EndLoc;
1823
1824        // First try the name of an overloaded operator
1825        if (OverloadedOperatorKind Op = TryParseOperatorFunctionId(&EndLoc)) {
1826          D.setOverloadedOperator(Op, OperatorLoc, EndLoc);
1827        } else {
1828          // This must be a conversion function (C++ [class.conv.fct]).
1829          if (TypeTy *ConvType = ParseConversionFunctionId(&EndLoc))
1830            D.setConversionFunction(ConvType, OperatorLoc, EndLoc);
1831          else {
1832            D.SetIdentifier(0, Tok.getLocation());
1833          }
1834        }
1835        goto PastIdentifier;
1836      } else if (Tok.is(tok::tilde)) {
1837        // This should be a C++ destructor.
1838        SourceLocation TildeLoc = ConsumeToken();
1839        if (Tok.is(tok::identifier)) {
1840          // FIXME: Inaccurate.
1841          SourceLocation NameLoc = Tok.getLocation();
1842          SourceLocation EndLoc;
1843          if (TypeTy *Type = ParseClassName(EndLoc)) {
1844            D.setDestructor(Type, TildeLoc, NameLoc);
1845          } else {
1846            D.SetIdentifier(0, TildeLoc);
1847          }
1848        } else {
1849          Diag(Tok, diag::err_expected_class_name);
1850          D.SetIdentifier(0, TildeLoc);
1851        }
1852        goto PastIdentifier;
1853      }
1854
1855      // If we reached this point, token is not identifier and not '~'.
1856
1857      if (afterCXXScope) {
1858        Diag(Tok, diag::err_expected_unqualified_id);
1859        D.SetIdentifier(0, Tok.getLocation());
1860        D.setInvalidType(true);
1861        goto PastIdentifier;
1862      }
1863    }
1864  }
1865
1866  // If we reached this point, we are either in C/ObjC or the token didn't
1867  // satisfy any of the C++-specific checks.
1868  if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) {
1869    assert(!getLang().CPlusPlus &&
1870           "There's a C++-specific check for tok::identifier above");
1871    assert(Tok.getIdentifierInfo() && "Not an identifier?");
1872    D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1873    ConsumeToken();
1874  } else if (Tok.is(tok::l_paren)) {
1875    // direct-declarator: '(' declarator ')'
1876    // direct-declarator: '(' attributes declarator ')'
1877    // Example: 'char (*X)'   or 'int (*XX)(void)'
1878    ParseParenDeclarator(D);
1879  } else if (D.mayOmitIdentifier()) {
1880    // This could be something simple like "int" (in which case the declarator
1881    // portion is empty), if an abstract-declarator is allowed.
1882    D.SetIdentifier(0, Tok.getLocation());
1883  } else {
1884    if (D.getContext() == Declarator::MemberContext)
1885      Diag(Tok, diag::err_expected_member_name_or_semi)
1886        << D.getDeclSpec().getSourceRange();
1887    else if (getLang().CPlusPlus)
1888      Diag(Tok, diag::err_expected_unqualified_id);
1889    else
1890      Diag(Tok, diag::err_expected_ident_lparen);
1891    D.SetIdentifier(0, Tok.getLocation());
1892    D.setInvalidType(true);
1893  }
1894
1895 PastIdentifier:
1896  assert(D.isPastIdentifier() &&
1897         "Haven't past the location of the identifier yet?");
1898
1899  while (1) {
1900    if (Tok.is(tok::l_paren)) {
1901      // The paren may be part of a C++ direct initializer, eg. "int x(1);".
1902      // In such a case, check if we actually have a function declarator; if it
1903      // is not, the declarator has been fully parsed.
1904      if (getLang().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) {
1905        // When not in file scope, warn for ambiguous function declarators, just
1906        // in case the author intended it as a variable definition.
1907        bool warnIfAmbiguous = D.getContext() != Declarator::FileContext;
1908        if (!isCXXFunctionDeclarator(warnIfAmbiguous))
1909          break;
1910      }
1911      ParseFunctionDeclarator(ConsumeParen(), D);
1912    } else if (Tok.is(tok::l_square)) {
1913      ParseBracketDeclarator(D);
1914    } else {
1915      break;
1916    }
1917  }
1918}
1919
1920/// ParseParenDeclarator - We parsed the declarator D up to a paren.  This is
1921/// only called before the identifier, so these are most likely just grouping
1922/// parens for precedence.  If we find that these are actually function
1923/// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator.
1924///
1925///       direct-declarator:
1926///         '(' declarator ')'
1927/// [GNU]   '(' attributes declarator ')'
1928///         direct-declarator '(' parameter-type-list ')'
1929///         direct-declarator '(' identifier-list[opt] ')'
1930/// [GNU]   direct-declarator '(' parameter-forward-declarations
1931///                    parameter-type-list[opt] ')'
1932///
1933void Parser::ParseParenDeclarator(Declarator &D) {
1934  SourceLocation StartLoc = ConsumeParen();
1935  assert(!D.isPastIdentifier() && "Should be called before passing identifier");
1936
1937  // Eat any attributes before we look at whether this is a grouping or function
1938  // declarator paren.  If this is a grouping paren, the attribute applies to
1939  // the type being built up, for example:
1940  //     int (__attribute__(()) *x)(long y)
1941  // If this ends up not being a grouping paren, the attribute applies to the
1942  // first argument, for example:
1943  //     int (__attribute__(()) int x)
1944  // In either case, we need to eat any attributes to be able to determine what
1945  // sort of paren this is.
1946  //
1947  AttributeList *AttrList = 0;
1948  bool RequiresArg = false;
1949  if (Tok.is(tok::kw___attribute)) {
1950    AttrList = ParseAttributes();
1951
1952    // We require that the argument list (if this is a non-grouping paren) be
1953    // present even if the attribute list was empty.
1954    RequiresArg = true;
1955  }
1956  // Eat any Microsoft extensions.
1957  while ((Tok.is(tok::kw___cdecl) || Tok.is(tok::kw___stdcall) ||
1958          (Tok.is(tok::kw___fastcall))) && PP.getLangOptions().Microsoft)
1959    ConsumeToken();
1960
1961  // If we haven't past the identifier yet (or where the identifier would be
1962  // stored, if this is an abstract declarator), then this is probably just
1963  // grouping parens. However, if this could be an abstract-declarator, then
1964  // this could also be the start of function arguments (consider 'void()').
1965  bool isGrouping;
1966
1967  if (!D.mayOmitIdentifier()) {
1968    // If this can't be an abstract-declarator, this *must* be a grouping
1969    // paren, because we haven't seen the identifier yet.
1970    isGrouping = true;
1971  } else if (Tok.is(tok::r_paren) ||           // 'int()' is a function.
1972             (getLang().CPlusPlus && Tok.is(tok::ellipsis)) || // C++ int(...)
1973             isDeclarationSpecifier()) {       // 'int(int)' is a function.
1974    // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
1975    // considered to be a type, not a K&R identifier-list.
1976    isGrouping = false;
1977  } else {
1978    // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
1979    isGrouping = true;
1980  }
1981
1982  // If this is a grouping paren, handle:
1983  // direct-declarator: '(' declarator ')'
1984  // direct-declarator: '(' attributes declarator ')'
1985  if (isGrouping) {
1986    bool hadGroupingParens = D.hasGroupingParens();
1987    D.setGroupingParens(true);
1988    if (AttrList)
1989      D.AddAttributes(AttrList, SourceLocation());
1990
1991    ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
1992    // Match the ')'.
1993    SourceLocation Loc = MatchRHSPunctuation(tok::r_paren, StartLoc);
1994
1995    D.setGroupingParens(hadGroupingParens);
1996    D.SetRangeEnd(Loc);
1997    return;
1998  }
1999
2000  // Okay, if this wasn't a grouping paren, it must be the start of a function
2001  // argument list.  Recognize that this declarator will never have an
2002  // identifier (and remember where it would have been), then call into
2003  // ParseFunctionDeclarator to handle of argument list.
2004  D.SetIdentifier(0, Tok.getLocation());
2005
2006  ParseFunctionDeclarator(StartLoc, D, AttrList, RequiresArg);
2007}
2008
2009/// ParseFunctionDeclarator - We are after the identifier and have parsed the
2010/// declarator D up to a paren, which indicates that we are parsing function
2011/// arguments.
2012///
2013/// If AttrList is non-null, then the caller parsed those arguments immediately
2014/// after the open paren - they should be considered to be the first argument of
2015/// a parameter.  If RequiresArg is true, then the first argument of the
2016/// function is required to be present and required to not be an identifier
2017/// list.
2018///
2019/// This method also handles this portion of the grammar:
2020///       parameter-type-list: [C99 6.7.5]
2021///         parameter-list
2022///         parameter-list ',' '...'
2023///
2024///       parameter-list: [C99 6.7.5]
2025///         parameter-declaration
2026///         parameter-list ',' parameter-declaration
2027///
2028///       parameter-declaration: [C99 6.7.5]
2029///         declaration-specifiers declarator
2030/// [C++]   declaration-specifiers declarator '=' assignment-expression
2031/// [GNU]   declaration-specifiers declarator attributes
2032///         declaration-specifiers abstract-declarator[opt]
2033/// [C++]   declaration-specifiers abstract-declarator[opt]
2034///           '=' assignment-expression
2035/// [GNU]   declaration-specifiers abstract-declarator[opt] attributes
2036///
2037/// For C++, after the parameter-list, it also parses "cv-qualifier-seq[opt]"
2038/// and "exception-specification[opt]"(TODO).
2039///
2040void Parser::ParseFunctionDeclarator(SourceLocation LParenLoc, Declarator &D,
2041                                     AttributeList *AttrList,
2042                                     bool RequiresArg) {
2043  // lparen is already consumed!
2044  assert(D.isPastIdentifier() && "Should not call before identifier!");
2045
2046  // This parameter list may be empty.
2047  if (Tok.is(tok::r_paren)) {
2048    if (RequiresArg) {
2049      Diag(Tok, diag::err_argument_required_after_attribute);
2050      delete AttrList;
2051    }
2052
2053    SourceLocation Loc = ConsumeParen();  // Eat the closing ')'.
2054
2055    // cv-qualifier-seq[opt].
2056    DeclSpec DS;
2057    if (getLang().CPlusPlus) {
2058      ParseTypeQualifierListOpt(DS, false /*no attributes*/);
2059      if (!DS.getSourceRange().getEnd().isInvalid())
2060        Loc = DS.getSourceRange().getEnd();
2061
2062      // Parse exception-specification[opt].
2063      if (Tok.is(tok::kw_throw))
2064        ParseExceptionSpecification(Loc);
2065    }
2066
2067    // Remember that we parsed a function type, and remember the attributes.
2068    // int() -> no prototype, no '...'.
2069    D.AddTypeInfo(DeclaratorChunk::getFunction(/*prototype*/getLang().CPlusPlus,
2070                                               /*variadic*/ false,
2071                                               SourceLocation(),
2072                                               /*arglist*/ 0, 0,
2073                                               DS.getTypeQualifiers(),
2074                                               LParenLoc, D),
2075                  Loc);
2076    return;
2077  }
2078
2079  // Alternatively, this parameter list may be an identifier list form for a
2080  // K&R-style function:  void foo(a,b,c)
2081  if (!getLang().CPlusPlus && Tok.is(tok::identifier)) {
2082    if (!TryAnnotateTypeOrScopeToken()) {
2083      // K&R identifier lists can't have typedefs as identifiers, per
2084      // C99 6.7.5.3p11.
2085      if (RequiresArg) {
2086        Diag(Tok, diag::err_argument_required_after_attribute);
2087        delete AttrList;
2088      }
2089      // Identifier list.  Note that '(' identifier-list ')' is only allowed for
2090      // normal declarators, not for abstract-declarators.
2091      return ParseFunctionDeclaratorIdentifierList(LParenLoc, D);
2092    }
2093  }
2094
2095  // Finally, a normal, non-empty parameter type list.
2096
2097  // Build up an array of information about the parsed arguments.
2098  llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
2099
2100  // Enter function-declaration scope, limiting any declarators to the
2101  // function prototype scope, including parameter declarators.
2102  ParseScope PrototypeScope(this,
2103                            Scope::FunctionPrototypeScope|Scope::DeclScope);
2104
2105  bool IsVariadic = false;
2106  SourceLocation EllipsisLoc;
2107  while (1) {
2108    if (Tok.is(tok::ellipsis)) {
2109      IsVariadic = true;
2110      EllipsisLoc = ConsumeToken();     // Consume the ellipsis.
2111      break;
2112    }
2113
2114    SourceLocation DSStart = Tok.getLocation();
2115
2116    // Parse the declaration-specifiers.
2117    DeclSpec DS;
2118
2119    // If the caller parsed attributes for the first argument, add them now.
2120    if (AttrList) {
2121      DS.AddAttributes(AttrList);
2122      AttrList = 0;  // Only apply the attributes to the first parameter.
2123    }
2124    ParseDeclarationSpecifiers(DS);
2125
2126    // Parse the declarator.  This is "PrototypeContext", because we must
2127    // accept either 'declarator' or 'abstract-declarator' here.
2128    Declarator ParmDecl(DS, Declarator::PrototypeContext);
2129    ParseDeclarator(ParmDecl);
2130
2131    // Parse GNU attributes, if present.
2132    if (Tok.is(tok::kw___attribute)) {
2133      SourceLocation Loc;
2134      AttributeList *AttrList = ParseAttributes(&Loc);
2135      ParmDecl.AddAttributes(AttrList, Loc);
2136    }
2137
2138    // Remember this parsed parameter in ParamInfo.
2139    IdentifierInfo *ParmII = ParmDecl.getIdentifier();
2140
2141    // DefArgToks is used when the parsing of default arguments needs
2142    // to be delayed.
2143    CachedTokens *DefArgToks = 0;
2144
2145    // If no parameter was specified, verify that *something* was specified,
2146    // otherwise we have a missing type and identifier.
2147    if (DS.isEmpty() && ParmDecl.getIdentifier() == 0 &&
2148        ParmDecl.getNumTypeObjects() == 0) {
2149      // Completely missing, emit error.
2150      Diag(DSStart, diag::err_missing_param);
2151    } else {
2152      // Otherwise, we have something.  Add it and let semantic analysis try
2153      // to grok it and add the result to the ParamInfo we are building.
2154
2155      // Inform the actions module about the parameter declarator, so it gets
2156      // added to the current scope.
2157      DeclTy *Param = Actions.ActOnParamDeclarator(CurScope, ParmDecl);
2158
2159      // Parse the default argument, if any. We parse the default
2160      // arguments in all dialects; the semantic analysis in
2161      // ActOnParamDefaultArgument will reject the default argument in
2162      // C.
2163      if (Tok.is(tok::equal)) {
2164        SourceLocation EqualLoc = Tok.getLocation();
2165
2166        // Parse the default argument
2167        if (D.getContext() == Declarator::MemberContext) {
2168          // If we're inside a class definition, cache the tokens
2169          // corresponding to the default argument. We'll actually parse
2170          // them when we see the end of the class definition.
2171          // FIXME: Templates will require something similar.
2172          // FIXME: Can we use a smart pointer for Toks?
2173          DefArgToks = new CachedTokens;
2174
2175          if (!ConsumeAndStoreUntil(tok::comma, tok::r_paren, *DefArgToks,
2176                                    tok::semi, false)) {
2177            delete DefArgToks;
2178            DefArgToks = 0;
2179            Actions.ActOnParamDefaultArgumentError(Param);
2180          } else
2181            Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc);
2182        } else {
2183          // Consume the '='.
2184          ConsumeToken();
2185
2186          OwningExprResult DefArgResult(ParseAssignmentExpression());
2187          if (DefArgResult.isInvalid()) {
2188            Actions.ActOnParamDefaultArgumentError(Param);
2189            SkipUntil(tok::comma, tok::r_paren, true, true);
2190          } else {
2191            // Inform the actions module about the default argument
2192            Actions.ActOnParamDefaultArgument(Param, EqualLoc,
2193                                              move(DefArgResult));
2194          }
2195        }
2196      }
2197
2198      ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
2199                                          ParmDecl.getIdentifierLoc(), Param,
2200                                          DefArgToks));
2201    }
2202
2203    // If the next token is a comma, consume it and keep reading arguments.
2204    if (Tok.isNot(tok::comma)) break;
2205
2206    // Consume the comma.
2207    ConsumeToken();
2208  }
2209
2210  // Leave prototype scope.
2211  PrototypeScope.Exit();
2212
2213  // If we have the closing ')', eat it.
2214  SourceLocation Loc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2215
2216  DeclSpec DS;
2217  if (getLang().CPlusPlus) {
2218    // Parse cv-qualifier-seq[opt].
2219    ParseTypeQualifierListOpt(DS, false /*no attributes*/);
2220      if (!DS.getSourceRange().getEnd().isInvalid())
2221        Loc = DS.getSourceRange().getEnd();
2222
2223    // Parse exception-specification[opt].
2224    if (Tok.is(tok::kw_throw))
2225      ParseExceptionSpecification(Loc);
2226  }
2227
2228  // Remember that we parsed a function type, and remember the attributes.
2229  D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/true, IsVariadic,
2230                                             EllipsisLoc,
2231                                             &ParamInfo[0], ParamInfo.size(),
2232                                             DS.getTypeQualifiers(),
2233                                             LParenLoc, D),
2234                Loc);
2235}
2236
2237/// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator
2238/// we found a K&R-style identifier list instead of a type argument list.  The
2239/// current token is known to be the first identifier in the list.
2240///
2241///       identifier-list: [C99 6.7.5]
2242///         identifier
2243///         identifier-list ',' identifier
2244///
2245void Parser::ParseFunctionDeclaratorIdentifierList(SourceLocation LParenLoc,
2246                                                   Declarator &D) {
2247  // Build up an array of information about the parsed arguments.
2248  llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
2249  llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar;
2250
2251  // If there was no identifier specified for the declarator, either we are in
2252  // an abstract-declarator, or we are in a parameter declarator which was found
2253  // to be abstract.  In abstract-declarators, identifier lists are not valid:
2254  // diagnose this.
2255  if (!D.getIdentifier())
2256    Diag(Tok, diag::ext_ident_list_in_param);
2257
2258  // Tok is known to be the first identifier in the list.  Remember this
2259  // identifier in ParamInfo.
2260  ParamsSoFar.insert(Tok.getIdentifierInfo());
2261  ParamInfo.push_back(DeclaratorChunk::ParamInfo(Tok.getIdentifierInfo(),
2262                                                 Tok.getLocation(), 0));
2263
2264  ConsumeToken();  // eat the first identifier.
2265
2266  while (Tok.is(tok::comma)) {
2267    // Eat the comma.
2268    ConsumeToken();
2269
2270    // If this isn't an identifier, report the error and skip until ')'.
2271    if (Tok.isNot(tok::identifier)) {
2272      Diag(Tok, diag::err_expected_ident);
2273      SkipUntil(tok::r_paren);
2274      return;
2275    }
2276
2277    IdentifierInfo *ParmII = Tok.getIdentifierInfo();
2278
2279    // Reject 'typedef int y; int test(x, y)', but continue parsing.
2280    if (Actions.getTypeName(*ParmII, Tok.getLocation(), CurScope))
2281      Diag(Tok, diag::err_unexpected_typedef_ident) << ParmII;
2282
2283    // Verify that the argument identifier has not already been mentioned.
2284    if (!ParamsSoFar.insert(ParmII)) {
2285      Diag(Tok, diag::err_param_redefinition) << ParmII;
2286    } else {
2287      // Remember this identifier in ParamInfo.
2288      ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
2289                                                     Tok.getLocation(), 0));
2290    }
2291
2292    // Eat the identifier.
2293    ConsumeToken();
2294  }
2295
2296  // If we have the closing ')', eat it and we're done.
2297  SourceLocation RLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2298
2299  // Remember that we parsed a function type, and remember the attributes.  This
2300  // function type is always a K&R style function type, which is not varargs and
2301  // has no prototype.
2302  D.AddTypeInfo(DeclaratorChunk::getFunction(/*proto*/false, /*varargs*/false,
2303                                             SourceLocation(),
2304                                             &ParamInfo[0], ParamInfo.size(),
2305                                             /*TypeQuals*/0, LParenLoc, D),
2306                RLoc);
2307}
2308
2309/// [C90]   direct-declarator '[' constant-expression[opt] ']'
2310/// [C99]   direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
2311/// [C99]   direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
2312/// [C99]   direct-declarator '[' type-qual-list 'static' assignment-expr ']'
2313/// [C99]   direct-declarator '[' type-qual-list[opt] '*' ']'
2314void Parser::ParseBracketDeclarator(Declarator &D) {
2315  SourceLocation StartLoc = ConsumeBracket();
2316
2317  // C array syntax has many features, but by-far the most common is [] and [4].
2318  // This code does a fast path to handle some of the most obvious cases.
2319  if (Tok.getKind() == tok::r_square) {
2320    SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
2321    // Remember that we parsed the empty array type.
2322    OwningExprResult NumElements(Actions);
2323    D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, 0, StartLoc),
2324                  EndLoc);
2325    return;
2326  } else if (Tok.getKind() == tok::numeric_constant &&
2327             GetLookAheadToken(1).is(tok::r_square)) {
2328    // [4] is very common.  Parse the numeric constant expression.
2329    OwningExprResult ExprRes(Actions.ActOnNumericConstant(Tok));
2330    ConsumeToken();
2331
2332    SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
2333
2334    // If there was an error parsing the assignment-expression, recover.
2335    if (ExprRes.isInvalid())
2336      ExprRes.release();  // Deallocate expr, just use [].
2337
2338    // Remember that we parsed a array type, and remember its features.
2339    D.AddTypeInfo(DeclaratorChunk::getArray(0, false, 0,
2340                                            ExprRes.release(), StartLoc),
2341                  EndLoc);
2342    return;
2343  }
2344
2345  // If valid, this location is the position where we read the 'static' keyword.
2346  SourceLocation StaticLoc;
2347  if (Tok.is(tok::kw_static))
2348    StaticLoc = ConsumeToken();
2349
2350  // If there is a type-qualifier-list, read it now.
2351  // Type qualifiers in an array subscript are a C99 feature.
2352  DeclSpec DS;
2353  ParseTypeQualifierListOpt(DS, false /*no attributes*/);
2354
2355  // If we haven't already read 'static', check to see if there is one after the
2356  // type-qualifier-list.
2357  if (!StaticLoc.isValid() && Tok.is(tok::kw_static))
2358    StaticLoc = ConsumeToken();
2359
2360  // Handle "direct-declarator [ type-qual-list[opt] * ]".
2361  bool isStar = false;
2362  OwningExprResult NumElements(Actions);
2363
2364  // Handle the case where we have '[*]' as the array size.  However, a leading
2365  // star could be the start of an expression, for example 'X[*p + 4]'.  Verify
2366  // the the token after the star is a ']'.  Since stars in arrays are
2367  // infrequent, use of lookahead is not costly here.
2368  if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) {
2369    ConsumeToken();  // Eat the '*'.
2370
2371    if (StaticLoc.isValid()) {
2372      Diag(StaticLoc, diag::err_unspecified_vla_size_with_static);
2373      StaticLoc = SourceLocation();  // Drop the static.
2374    }
2375    isStar = true;
2376  } else if (Tok.isNot(tok::r_square)) {
2377    // Note, in C89, this production uses the constant-expr production instead
2378    // of assignment-expr.  The only difference is that assignment-expr allows
2379    // things like '=' and '*='.  Sema rejects these in C89 mode because they
2380    // are not i-c-e's, so we don't need to distinguish between the two here.
2381
2382    // Parse the assignment-expression now.
2383    NumElements = ParseAssignmentExpression();
2384  }
2385
2386  // If there was an error parsing the assignment-expression, recover.
2387  if (NumElements.isInvalid()) {
2388    // If the expression was invalid, skip it.
2389    SkipUntil(tok::r_square);
2390    return;
2391  }
2392
2393  SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
2394
2395  // Remember that we parsed a array type, and remember its features.
2396  D.AddTypeInfo(DeclaratorChunk::getArray(DS.getTypeQualifiers(),
2397                                          StaticLoc.isValid(), isStar,
2398                                          NumElements.release(), StartLoc),
2399                EndLoc);
2400}
2401
2402/// [GNU]   typeof-specifier:
2403///           typeof ( expressions )
2404///           typeof ( type-name )
2405/// [GNU/C++] typeof unary-expression
2406///
2407void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
2408  assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier");
2409  const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
2410  SourceLocation StartLoc = ConsumeToken();
2411
2412  if (Tok.isNot(tok::l_paren)) {
2413    if (!getLang().CPlusPlus) {
2414      Diag(Tok, diag::err_expected_lparen_after_id) << BuiltinII;
2415      return;
2416    }
2417
2418    OwningExprResult Result(ParseCastExpression(true/*isUnaryExpression*/));
2419    if (Result.isInvalid()) {
2420      DS.SetTypeSpecError();
2421      return;
2422    }
2423
2424    const char *PrevSpec = 0;
2425    // Check for duplicate type specifiers.
2426    if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
2427                           Result.release()))
2428      Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
2429
2430    // FIXME: Not accurate, the range gets one token more than it should.
2431    DS.SetRangeEnd(Tok.getLocation());
2432    return;
2433  }
2434
2435  SourceLocation LParenLoc = ConsumeParen(), RParenLoc;
2436
2437  if (isTypeIdInParens()) {
2438    Action::TypeResult Ty = ParseTypeName();
2439
2440    assert((Ty.isInvalid() || Ty.get()) &&
2441           "Parser::ParseTypeofSpecifier(): missing type");
2442
2443    if (Tok.isNot(tok::r_paren)) {
2444      MatchRHSPunctuation(tok::r_paren, LParenLoc);
2445      return;
2446    }
2447    RParenLoc = ConsumeParen();
2448
2449    if (Ty.isInvalid())
2450      DS.SetTypeSpecError();
2451    else {
2452      const char *PrevSpec = 0;
2453      // Check for duplicate type specifiers (e.g. "int typeof(int)").
2454      if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec,
2455                             Ty.get()))
2456        Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
2457    }
2458  } else { // we have an expression.
2459    OwningExprResult Result(ParseExpression());
2460
2461    if (Result.isInvalid() || Tok.isNot(tok::r_paren)) {
2462      MatchRHSPunctuation(tok::r_paren, LParenLoc);
2463      DS.SetTypeSpecError();
2464      return;
2465    }
2466    RParenLoc = ConsumeParen();
2467    const char *PrevSpec = 0;
2468    // Check for duplicate type specifiers (e.g. "int typeof(int)").
2469    if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
2470                           Result.release()))
2471      Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec;
2472  }
2473  DS.SetRangeEnd(RParenLoc);
2474}
2475
2476
2477