ParseTemplate.cpp revision 874d253668f9ed183ca409cdff9d424925ee7800
1//===--- ParseTemplate.cpp - Template 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 parsing of C++ templates.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Parse/Parser.h"
15#include "clang/Parse/ParseDiagnostic.h"
16#include "clang/Sema/DeclSpec.h"
17#include "clang/Sema/ParsedTemplate.h"
18#include "clang/Sema/Scope.h"
19#include "RAIIObjectsForParser.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/ASTConsumer.h"
22using namespace clang;
23
24/// \brief Parse a template declaration, explicit instantiation, or
25/// explicit specialization.
26Decl *
27Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
28                                             SourceLocation &DeclEnd,
29                                             AccessSpecifier AS,
30                                             AttributeList *AccessAttrs) {
31  ObjCDeclContextSwitch ObjCDC(*this);
32
33  if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
34    return ParseExplicitInstantiation(SourceLocation(), ConsumeToken(),
35                                           DeclEnd);
36  }
37  return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
38                                                  AccessAttrs);
39}
40
41/// \brief RAII class that manages the template parameter depth.
42namespace {
43  class TemplateParameterDepthCounter {
44    unsigned &Depth;
45    unsigned AddedLevels;
46
47  public:
48    explicit TemplateParameterDepthCounter(unsigned &Depth)
49      : Depth(Depth), AddedLevels(0) { }
50
51    ~TemplateParameterDepthCounter() {
52      Depth -= AddedLevels;
53    }
54
55    void operator++() {
56      ++Depth;
57      ++AddedLevels;
58    }
59
60    operator unsigned() const { return Depth; }
61  };
62}
63
64/// \brief Parse a template declaration or an explicit specialization.
65///
66/// Template declarations include one or more template parameter lists
67/// and either the function or class template declaration. Explicit
68/// specializations contain one or more 'template < >' prefixes
69/// followed by a (possibly templated) declaration. Since the
70/// syntactic form of both features is nearly identical, we parse all
71/// of the template headers together and let semantic analysis sort
72/// the declarations from the explicit specializations.
73///
74///       template-declaration: [C++ temp]
75///         'export'[opt] 'template' '<' template-parameter-list '>' declaration
76///
77///       explicit-specialization: [ C++ temp.expl.spec]
78///         'template' '<' '>' declaration
79Decl *
80Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
81                                                 SourceLocation &DeclEnd,
82                                                 AccessSpecifier AS,
83                                                 AttributeList *AccessAttrs) {
84  assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
85         "Token does not start a template declaration.");
86
87  // Enter template-parameter scope.
88  ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
89
90  // Tell the action that names should be checked in the context of
91  // the declaration to come.
92  ParsingDeclRAIIObject ParsingTemplateParams(*this);
93
94  // Parse multiple levels of template headers within this template
95  // parameter scope, e.g.,
96  //
97  //   template<typename T>
98  //     template<typename U>
99  //       class A<T>::B { ... };
100  //
101  // We parse multiple levels non-recursively so that we can build a
102  // single data structure containing all of the template parameter
103  // lists to easily differentiate between the case above and:
104  //
105  //   template<typename T>
106  //   class A {
107  //     template<typename U> class B;
108  //   };
109  //
110  // In the first case, the action for declaring A<T>::B receives
111  // both template parameter lists. In the second case, the action for
112  // defining A<T>::B receives just the inner template parameter list
113  // (and retrieves the outer template parameter list from its
114  // context).
115  bool isSpecialization = true;
116  bool LastParamListWasEmpty = false;
117  TemplateParameterLists ParamLists;
118  TemplateParameterDepthCounter Depth(TemplateParameterDepth);
119  do {
120    // Consume the 'export', if any.
121    SourceLocation ExportLoc;
122    if (Tok.is(tok::kw_export)) {
123      ExportLoc = ConsumeToken();
124    }
125
126    // Consume the 'template', which should be here.
127    SourceLocation TemplateLoc;
128    if (Tok.is(tok::kw_template)) {
129      TemplateLoc = ConsumeToken();
130    } else {
131      Diag(Tok.getLocation(), diag::err_expected_template);
132      return 0;
133    }
134
135    // Parse the '<' template-parameter-list '>'
136    SourceLocation LAngleLoc, RAngleLoc;
137    SmallVector<Decl*, 4> TemplateParams;
138    if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc,
139                                RAngleLoc)) {
140      // Skip until the semi-colon or a }.
141      SkipUntil(tok::r_brace, true, true);
142      if (Tok.is(tok::semi))
143        ConsumeToken();
144      return 0;
145    }
146
147    ParamLists.push_back(
148      Actions.ActOnTemplateParameterList(Depth, ExportLoc,
149                                         TemplateLoc, LAngleLoc,
150                                         TemplateParams.data(),
151                                         TemplateParams.size(), RAngleLoc));
152
153    if (!TemplateParams.empty()) {
154      isSpecialization = false;
155      ++Depth;
156    } else {
157      LastParamListWasEmpty = true;
158    }
159  } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
160
161  // Parse the actual template declaration.
162  return ParseSingleDeclarationAfterTemplate(Context,
163                                             ParsedTemplateInfo(&ParamLists,
164                                                             isSpecialization,
165                                                         LastParamListWasEmpty),
166                                             ParsingTemplateParams,
167                                             DeclEnd, AS, AccessAttrs);
168}
169
170/// \brief Parse a single declaration that declares a template,
171/// template specialization, or explicit instantiation of a template.
172///
173/// \param TemplateParams if non-NULL, the template parameter lists
174/// that preceded this declaration. In this case, the declaration is a
175/// template declaration, out-of-line definition of a template, or an
176/// explicit template specialization. When NULL, the declaration is an
177/// explicit template instantiation.
178///
179/// \param TemplateLoc when TemplateParams is NULL, the location of
180/// the 'template' keyword that indicates that we have an explicit
181/// template instantiation.
182///
183/// \param DeclEnd will receive the source location of the last token
184/// within this declaration.
185///
186/// \param AS the access specifier associated with this
187/// declaration. Will be AS_none for namespace-scope declarations.
188///
189/// \returns the new declaration.
190Decl *
191Parser::ParseSingleDeclarationAfterTemplate(
192                                       unsigned Context,
193                                       const ParsedTemplateInfo &TemplateInfo,
194                                       ParsingDeclRAIIObject &DiagsFromTParams,
195                                       SourceLocation &DeclEnd,
196                                       AccessSpecifier AS,
197                                       AttributeList *AccessAttrs) {
198  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
199         "Template information required");
200
201  if (Context == Declarator::MemberContext) {
202    // We are parsing a member template.
203    ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
204                                   &DiagsFromTParams);
205    return 0;
206  }
207
208  ParsedAttributesWithRange prefixAttrs(AttrFactory);
209  MaybeParseCXX0XAttributes(prefixAttrs);
210
211  if (Tok.is(tok::kw_using))
212    return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
213                                            prefixAttrs);
214
215  // Parse the declaration specifiers, stealing the accumulated
216  // diagnostics from the template parameters.
217  ParsingDeclSpec DS(*this, &DiagsFromTParams);
218
219  DS.takeAttributesFrom(prefixAttrs);
220
221  ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
222                             getDeclSpecContextFromDeclaratorContext(Context));
223
224  if (Tok.is(tok::semi)) {
225    DeclEnd = ConsumeToken();
226    Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
227    DS.complete(Decl);
228    return Decl;
229  }
230
231  // Parse the declarator.
232  ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
233  ParseDeclarator(DeclaratorInfo);
234  // Error parsing the declarator?
235  if (!DeclaratorInfo.hasName()) {
236    // If so, skip until the semi-colon or a }.
237    SkipUntil(tok::r_brace, true, true);
238    if (Tok.is(tok::semi))
239      ConsumeToken();
240    return 0;
241  }
242
243  // Check for a stray semicolon in a function definition.
244  if (DeclaratorInfo.isFunctionDeclarator() && Tok.is(tok::semi) &&
245      Context == Declarator::FileContext) {
246    const Token &Next = NextToken();
247    if (Next.is(tok::l_brace) || Next.is(tok::kw_try) ||
248        Next.is(tok::equal) || Next.is(tok::colon)) {
249      SourceLocation SemiLoc = ConsumeToken();
250      Diag(SemiLoc, diag::err_stray_semi_function_definition)
251        << FixItHint::CreateRemoval(SemiLoc);
252      assert(!isDeclarationAfterDeclarator() &&
253             isStartOfFunctionDefinition(DeclaratorInfo));
254    }
255  }
256
257  // If we have a declaration or declarator list, handle it.
258  if (isDeclarationAfterDeclarator()) {
259    // Parse this declaration.
260    Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
261                                                     TemplateInfo);
262
263    if (Tok.is(tok::comma)) {
264      Diag(Tok, diag::err_multiple_template_declarators)
265        << (int)TemplateInfo.Kind;
266      SkipUntil(tok::semi, true, false);
267      return ThisDecl;
268    }
269
270    // Eat the semi colon after the declaration.
271    ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration);
272    DeclaratorInfo.complete(ThisDecl);
273    return ThisDecl;
274  }
275
276  if (DeclaratorInfo.isFunctionDeclarator() &&
277      isStartOfFunctionDefinition(DeclaratorInfo)) {
278    if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
279      Diag(Tok, diag::err_function_declared_typedef);
280
281      // Recover by ignoring the 'typedef'.
282      DS.ClearStorageClassSpecs();
283    }
284    return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo);
285  }
286
287  if (DeclaratorInfo.isFunctionDeclarator())
288    Diag(Tok, diag::err_expected_fn_body);
289  else
290    Diag(Tok, diag::err_invalid_token_after_toplevel_declarator);
291  SkipUntil(tok::semi);
292  return 0;
293}
294
295/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
296/// angle brackets. Depth is the depth of this template-parameter-list, which
297/// is the number of template headers directly enclosing this template header.
298/// TemplateParams is the current list of template parameters we're building.
299/// The template parameter we parse will be added to this list. LAngleLoc and
300/// RAngleLoc will receive the positions of the '<' and '>', respectively,
301/// that enclose this template parameter list.
302///
303/// \returns true if an error occurred, false otherwise.
304bool Parser::ParseTemplateParameters(unsigned Depth,
305                               SmallVectorImpl<Decl*> &TemplateParams,
306                                     SourceLocation &LAngleLoc,
307                                     SourceLocation &RAngleLoc) {
308  // Get the template parameter list.
309  if (!Tok.is(tok::less)) {
310    Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
311    return true;
312  }
313  LAngleLoc = ConsumeToken();
314
315  // Try to parse the template parameter list.
316  if (Tok.is(tok::greater))
317    RAngleLoc = ConsumeToken();
318  else if (ParseTemplateParameterList(Depth, TemplateParams)) {
319    if (!Tok.is(tok::greater)) {
320      Diag(Tok.getLocation(), diag::err_expected_greater);
321      return true;
322    }
323    RAngleLoc = ConsumeToken();
324  }
325  return false;
326}
327
328/// ParseTemplateParameterList - Parse a template parameter list. If
329/// the parsing fails badly (i.e., closing bracket was left out), this
330/// will try to put the token stream in a reasonable position (closing
331/// a statement, etc.) and return false.
332///
333///       template-parameter-list:    [C++ temp]
334///         template-parameter
335///         template-parameter-list ',' template-parameter
336bool
337Parser::ParseTemplateParameterList(unsigned Depth,
338                             SmallVectorImpl<Decl*> &TemplateParams) {
339  while (1) {
340    if (Decl *TmpParam
341          = ParseTemplateParameter(Depth, TemplateParams.size())) {
342      TemplateParams.push_back(TmpParam);
343    } else {
344      // If we failed to parse a template parameter, skip until we find
345      // a comma or closing brace.
346      SkipUntil(tok::comma, tok::greater, true, true);
347    }
348
349    // Did we find a comma or the end of the template parmeter list?
350    if (Tok.is(tok::comma)) {
351      ConsumeToken();
352    } else if (Tok.is(tok::greater)) {
353      // Don't consume this... that's done by template parser.
354      break;
355    } else {
356      // Somebody probably forgot to close the template. Skip ahead and
357      // try to get out of the expression. This error is currently
358      // subsumed by whatever goes on in ParseTemplateParameter.
359      // TODO: This could match >>, and it would be nice to avoid those
360      // silly errors with template <vec<T>>.
361      Diag(Tok.getLocation(), diag::err_expected_comma_greater);
362      SkipUntil(tok::greater, true, true);
363      return false;
364    }
365  }
366  return true;
367}
368
369/// \brief Determine whether the parser is at the start of a template
370/// type parameter.
371bool Parser::isStartOfTemplateTypeParameter() {
372  if (Tok.is(tok::kw_class)) {
373    // "class" may be the start of an elaborated-type-specifier or a
374    // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
375    switch (NextToken().getKind()) {
376    case tok::equal:
377    case tok::comma:
378    case tok::greater:
379    case tok::greatergreater:
380    case tok::ellipsis:
381      return true;
382
383    case tok::identifier:
384      // This may be either a type-parameter or an elaborated-type-specifier.
385      // We have to look further.
386      break;
387
388    default:
389      return false;
390    }
391
392    switch (GetLookAheadToken(2).getKind()) {
393    case tok::equal:
394    case tok::comma:
395    case tok::greater:
396    case tok::greatergreater:
397      return true;
398
399    default:
400      return false;
401    }
402  }
403
404  if (Tok.isNot(tok::kw_typename))
405    return false;
406
407  // C++ [temp.param]p2:
408  //   There is no semantic difference between class and typename in a
409  //   template-parameter. typename followed by an unqualified-id
410  //   names a template type parameter. typename followed by a
411  //   qualified-id denotes the type in a non-type
412  //   parameter-declaration.
413  Token Next = NextToken();
414
415  // If we have an identifier, skip over it.
416  if (Next.getKind() == tok::identifier)
417    Next = GetLookAheadToken(2);
418
419  switch (Next.getKind()) {
420  case tok::equal:
421  case tok::comma:
422  case tok::greater:
423  case tok::greatergreater:
424  case tok::ellipsis:
425    return true;
426
427  default:
428    return false;
429  }
430}
431
432/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
433///
434///       template-parameter: [C++ temp.param]
435///         type-parameter
436///         parameter-declaration
437///
438///       type-parameter: (see below)
439///         'class' ...[opt] identifier[opt]
440///         'class' identifier[opt] '=' type-id
441///         'typename' ...[opt] identifier[opt]
442///         'typename' identifier[opt] '=' type-id
443///         'template' '<' template-parameter-list '>'
444///               'class' ...[opt] identifier[opt]
445///         'template' '<' template-parameter-list '>' 'class' identifier[opt]
446///               = id-expression
447Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
448  if (isStartOfTemplateTypeParameter())
449    return ParseTypeParameter(Depth, Position);
450
451  if (Tok.is(tok::kw_template))
452    return ParseTemplateTemplateParameter(Depth, Position);
453
454  // If it's none of the above, then it must be a parameter declaration.
455  // NOTE: This will pick up errors in the closure of the template parameter
456  // list (e.g., template < ; Check here to implement >> style closures.
457  return ParseNonTypeTemplateParameter(Depth, Position);
458}
459
460/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
461/// Other kinds of template parameters are parsed in
462/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
463///
464///       type-parameter:     [C++ temp.param]
465///         'class' ...[opt][C++0x] identifier[opt]
466///         'class' identifier[opt] '=' type-id
467///         'typename' ...[opt][C++0x] identifier[opt]
468///         'typename' identifier[opt] '=' type-id
469Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
470  assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) &&
471         "A type-parameter starts with 'class' or 'typename'");
472
473  // Consume the 'class' or 'typename' keyword.
474  bool TypenameKeyword = Tok.is(tok::kw_typename);
475  SourceLocation KeyLoc = ConsumeToken();
476
477  // Grab the ellipsis (if given).
478  bool Ellipsis = false;
479  SourceLocation EllipsisLoc;
480  if (Tok.is(tok::ellipsis)) {
481    Ellipsis = true;
482    EllipsisLoc = ConsumeToken();
483
484    Diag(EllipsisLoc,
485         getLang().CPlusPlus0x
486           ? diag::warn_cxx98_compat_variadic_templates
487           : diag::ext_variadic_templates);
488  }
489
490  // Grab the template parameter name (if given)
491  SourceLocation NameLoc;
492  IdentifierInfo* ParamName = 0;
493  if (Tok.is(tok::identifier)) {
494    ParamName = Tok.getIdentifierInfo();
495    NameLoc = ConsumeToken();
496  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
497            Tok.is(tok::greater)) {
498    // Unnamed template parameter. Don't have to do anything here, just
499    // don't consume this token.
500  } else {
501    Diag(Tok.getLocation(), diag::err_expected_ident);
502    return 0;
503  }
504
505  // Grab a default argument (if available).
506  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
507  // we introduce the type parameter into the local scope.
508  SourceLocation EqualLoc;
509  ParsedType DefaultArg;
510  if (Tok.is(tok::equal)) {
511    EqualLoc = ConsumeToken();
512    DefaultArg = ParseTypeName().get();
513  }
514
515  return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis,
516                                    EllipsisLoc, KeyLoc, ParamName, NameLoc,
517                                    Depth, Position, EqualLoc, DefaultArg);
518}
519
520/// ParseTemplateTemplateParameter - Handle the parsing of template
521/// template parameters.
522///
523///       type-parameter:    [C++ temp.param]
524///         'template' '<' template-parameter-list '>' 'class'
525///                  ...[opt] identifier[opt]
526///         'template' '<' template-parameter-list '>' 'class' identifier[opt]
527///                  = id-expression
528Decl *
529Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
530  assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
531
532  // Handle the template <...> part.
533  SourceLocation TemplateLoc = ConsumeToken();
534  SmallVector<Decl*,8> TemplateParams;
535  SourceLocation LAngleLoc, RAngleLoc;
536  {
537    ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
538    if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
539                               RAngleLoc)) {
540      return 0;
541    }
542  }
543
544  // Generate a meaningful error if the user forgot to put class before the
545  // identifier, comma, or greater.
546  if (!Tok.is(tok::kw_class)) {
547    Diag(Tok.getLocation(), diag::err_expected_class_before)
548      << PP.getSpelling(Tok);
549    return 0;
550  }
551  ConsumeToken();
552
553  // Parse the ellipsis, if given.
554  SourceLocation EllipsisLoc;
555  if (Tok.is(tok::ellipsis)) {
556    EllipsisLoc = ConsumeToken();
557
558    Diag(EllipsisLoc,
559         getLang().CPlusPlus0x
560           ? diag::warn_cxx98_compat_variadic_templates
561           : diag::ext_variadic_templates);
562  }
563
564  // Get the identifier, if given.
565  SourceLocation NameLoc;
566  IdentifierInfo* ParamName = 0;
567  if (Tok.is(tok::identifier)) {
568    ParamName = Tok.getIdentifierInfo();
569    NameLoc = ConsumeToken();
570  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) {
571    // Unnamed template parameter. Don't have to do anything here, just
572    // don't consume this token.
573  } else {
574    Diag(Tok.getLocation(), diag::err_expected_ident);
575    return 0;
576  }
577
578  TemplateParameterList *ParamList =
579    Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
580                                       TemplateLoc, LAngleLoc,
581                                       TemplateParams.data(),
582                                       TemplateParams.size(),
583                                       RAngleLoc);
584
585  // Grab a default argument (if available).
586  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
587  // we introduce the template parameter into the local scope.
588  SourceLocation EqualLoc;
589  ParsedTemplateArgument DefaultArg;
590  if (Tok.is(tok::equal)) {
591    EqualLoc = ConsumeToken();
592    DefaultArg = ParseTemplateTemplateArgument();
593    if (DefaultArg.isInvalid()) {
594      Diag(Tok.getLocation(),
595           diag::err_default_template_template_parameter_not_template);
596      static const tok::TokenKind EndToks[] = {
597        tok::comma, tok::greater, tok::greatergreater
598      };
599      SkipUntil(EndToks, 3, true, true);
600    }
601  }
602
603  return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
604                                                ParamList, EllipsisLoc,
605                                                ParamName, NameLoc, Depth,
606                                                Position, EqualLoc, DefaultArg);
607}
608
609/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
610/// template parameters (e.g., in "template<int Size> class array;").
611///
612///       template-parameter:
613///         ...
614///         parameter-declaration
615Decl *
616Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
617  // Parse the declaration-specifiers (i.e., the type).
618  // FIXME: The type should probably be restricted in some way... Not all
619  // declarators (parts of declarators?) are accepted for parameters.
620  DeclSpec DS(AttrFactory);
621  ParseDeclarationSpecifiers(DS);
622
623  // Parse this as a typename.
624  Declarator ParamDecl(DS, Declarator::TemplateParamContext);
625  ParseDeclarator(ParamDecl);
626  if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
627    // This probably shouldn't happen - and it's more of a Sema thing, but
628    // basically we didn't parse the type name because we couldn't associate
629    // it with an AST node. we should just skip to the comma or greater.
630    // TODO: This is currently a placeholder for some kind of Sema Error.
631    Diag(Tok.getLocation(), diag::err_parse_error);
632    SkipUntil(tok::comma, tok::greater, true, true);
633    return 0;
634  }
635
636  // If there is a default value, parse it.
637  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
638  // we introduce the template parameter into the local scope.
639  SourceLocation EqualLoc;
640  ExprResult DefaultArg;
641  if (Tok.is(tok::equal)) {
642    EqualLoc = ConsumeToken();
643
644    // C++ [temp.param]p15:
645    //   When parsing a default template-argument for a non-type
646    //   template-parameter, the first non-nested > is taken as the
647    //   end of the template-parameter-list rather than a greater-than
648    //   operator.
649    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
650
651    DefaultArg = ParseAssignmentExpression();
652    if (DefaultArg.isInvalid())
653      SkipUntil(tok::comma, tok::greater, true, true);
654  }
655
656  // Create the parameter.
657  return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
658                                               Depth, Position, EqualLoc,
659                                               DefaultArg.take());
660}
661
662/// \brief Parses a template-id that after the template name has
663/// already been parsed.
664///
665/// This routine takes care of parsing the enclosed template argument
666/// list ('<' template-parameter-list [opt] '>') and placing the
667/// results into a form that can be transferred to semantic analysis.
668///
669/// \param Template the template declaration produced by isTemplateName
670///
671/// \param TemplateNameLoc the source location of the template name
672///
673/// \param SS if non-NULL, the nested-name-specifier preceding the
674/// template name.
675///
676/// \param ConsumeLastToken if true, then we will consume the last
677/// token that forms the template-id. Otherwise, we will leave the
678/// last token in the stream (e.g., so that it can be replaced with an
679/// annotation token).
680bool
681Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
682                                         SourceLocation TemplateNameLoc,
683                                         const CXXScopeSpec &SS,
684                                         bool ConsumeLastToken,
685                                         SourceLocation &LAngleLoc,
686                                         TemplateArgList &TemplateArgs,
687                                         SourceLocation &RAngleLoc) {
688  assert(Tok.is(tok::less) && "Must have already parsed the template-name");
689
690  // Consume the '<'.
691  LAngleLoc = ConsumeToken();
692
693  // Parse the optional template-argument-list.
694  bool Invalid = false;
695  {
696    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
697    if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
698      Invalid = ParseTemplateArgumentList(TemplateArgs);
699
700    if (Invalid) {
701      // Try to find the closing '>'.
702      SkipUntil(tok::greater, true, !ConsumeLastToken);
703
704      return true;
705    }
706  }
707
708  if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) {
709    Diag(Tok.getLocation(), diag::err_expected_greater);
710    return true;
711  }
712
713  // Determine the location of the '>' or '>>'. Only consume this
714  // token if the caller asked us to.
715  RAngleLoc = Tok.getLocation();
716
717  if (Tok.is(tok::greatergreater)) {
718    const char *ReplaceStr = "> >";
719    if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
720      ReplaceStr = "> > ";
721
722    Diag(Tok.getLocation(), getLang().CPlusPlus0x ?
723         diag::warn_cxx98_compat_two_right_angle_brackets :
724         diag::err_two_right_angle_brackets_need_space)
725      << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()),
726                                      ReplaceStr);
727
728    Tok.setKind(tok::greater);
729    if (!ConsumeLastToken) {
730      // Since we're not supposed to consume the '>>' token, we need
731      // to insert a second '>' token after the first.
732      PP.EnterToken(Tok);
733    }
734  } else if (ConsumeLastToken)
735    ConsumeToken();
736
737  return false;
738}
739
740/// \brief Replace the tokens that form a simple-template-id with an
741/// annotation token containing the complete template-id.
742///
743/// The first token in the stream must be the name of a template that
744/// is followed by a '<'. This routine will parse the complete
745/// simple-template-id and replace the tokens with a single annotation
746/// token with one of two different kinds: if the template-id names a
747/// type (and \p AllowTypeAnnotation is true), the annotation token is
748/// a type annotation that includes the optional nested-name-specifier
749/// (\p SS). Otherwise, the annotation token is a template-id
750/// annotation that does not include the optional
751/// nested-name-specifier.
752///
753/// \param Template  the declaration of the template named by the first
754/// token (an identifier), as returned from \c Action::isTemplateName().
755///
756/// \param TemplateNameKind the kind of template that \p Template
757/// refers to, as returned from \c Action::isTemplateName().
758///
759/// \param SS if non-NULL, the nested-name-specifier that precedes
760/// this template name.
761///
762/// \param TemplateKWLoc if valid, specifies that this template-id
763/// annotation was preceded by the 'template' keyword and gives the
764/// location of that keyword. If invalid (the default), then this
765/// template-id was not preceded by a 'template' keyword.
766///
767/// \param AllowTypeAnnotation if true (the default), then a
768/// simple-template-id that refers to a class template, template
769/// template parameter, or other template that produces a type will be
770/// replaced with a type annotation token. Otherwise, the
771/// simple-template-id is always replaced with a template-id
772/// annotation token.
773///
774/// If an unrecoverable parse error occurs and no annotation token can be
775/// formed, this function returns true.
776///
777bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
778                                     CXXScopeSpec &SS,
779                                     UnqualifiedId &TemplateName,
780                                     SourceLocation TemplateKWLoc,
781                                     bool AllowTypeAnnotation) {
782  assert(getLang().CPlusPlus && "Can only annotate template-ids in C++");
783  assert(Template && Tok.is(tok::less) &&
784         "Parser isn't at the beginning of a template-id");
785
786  // Consume the template-name.
787  SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
788
789  // Parse the enclosed template argument list.
790  SourceLocation LAngleLoc, RAngleLoc;
791  TemplateArgList TemplateArgs;
792  bool Invalid = ParseTemplateIdAfterTemplateName(Template,
793                                                  TemplateNameLoc,
794                                                  SS, false, LAngleLoc,
795                                                  TemplateArgs,
796                                                  RAngleLoc);
797
798  if (Invalid) {
799    // If we failed to parse the template ID but skipped ahead to a >, we're not
800    // going to be able to form a token annotation.  Eat the '>' if present.
801    if (Tok.is(tok::greater))
802      ConsumeToken();
803    return true;
804  }
805
806  ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
807                                     TemplateArgs.size());
808
809  // Build the annotation token.
810  if (TNK == TNK_Type_template && AllowTypeAnnotation) {
811    TypeResult Type
812      = Actions.ActOnTemplateIdType(SS,
813                                    Template, TemplateNameLoc,
814                                    LAngleLoc, TemplateArgsPtr,
815                                    RAngleLoc);
816    if (Type.isInvalid()) {
817      // If we failed to parse the template ID but skipped ahead to a >, we're not
818      // going to be able to form a token annotation.  Eat the '>' if present.
819      if (Tok.is(tok::greater))
820        ConsumeToken();
821      return true;
822    }
823
824    Tok.setKind(tok::annot_typename);
825    setTypeAnnotation(Tok, Type.get());
826    if (SS.isNotEmpty())
827      Tok.setLocation(SS.getBeginLoc());
828    else if (TemplateKWLoc.isValid())
829      Tok.setLocation(TemplateKWLoc);
830    else
831      Tok.setLocation(TemplateNameLoc);
832  } else {
833    // Build a template-id annotation token that can be processed
834    // later.
835    Tok.setKind(tok::annot_template_id);
836    TemplateIdAnnotation *TemplateId
837      = TemplateIdAnnotation::Allocate(TemplateArgs.size());
838    TemplateId->TemplateNameLoc = TemplateNameLoc;
839    if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
840      TemplateId->Name = TemplateName.Identifier;
841      TemplateId->Operator = OO_None;
842    } else {
843      TemplateId->Name = 0;
844      TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
845    }
846    TemplateId->SS = SS;
847    TemplateId->Template = Template;
848    TemplateId->Kind = TNK;
849    TemplateId->LAngleLoc = LAngleLoc;
850    TemplateId->RAngleLoc = RAngleLoc;
851    ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
852    for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
853      Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]);
854    Tok.setAnnotationValue(TemplateId);
855    if (TemplateKWLoc.isValid())
856      Tok.setLocation(TemplateKWLoc);
857    else
858      Tok.setLocation(TemplateNameLoc);
859
860    TemplateArgsPtr.release();
861  }
862
863  // Common fields for the annotation token
864  Tok.setAnnotationEndLoc(RAngleLoc);
865
866  // In case the tokens were cached, have Preprocessor replace them with the
867  // annotation token.
868  PP.AnnotateCachedTokens(Tok);
869  return false;
870}
871
872/// \brief Replaces a template-id annotation token with a type
873/// annotation token.
874///
875/// If there was a failure when forming the type from the template-id,
876/// a type annotation token will still be created, but will have a
877/// NULL type pointer to signify an error.
878void Parser::AnnotateTemplateIdTokenAsType() {
879  assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
880
881  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
882  assert((TemplateId->Kind == TNK_Type_template ||
883          TemplateId->Kind == TNK_Dependent_template_name) &&
884         "Only works for type and dependent templates");
885
886  ASTTemplateArgsPtr TemplateArgsPtr(Actions,
887                                     TemplateId->getTemplateArgs(),
888                                     TemplateId->NumArgs);
889
890  TypeResult Type
891    = Actions.ActOnTemplateIdType(TemplateId->SS,
892                                  TemplateId->Template,
893                                  TemplateId->TemplateNameLoc,
894                                  TemplateId->LAngleLoc,
895                                  TemplateArgsPtr,
896                                  TemplateId->RAngleLoc);
897  // Create the new "type" annotation token.
898  Tok.setKind(tok::annot_typename);
899  setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
900  if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
901    Tok.setLocation(TemplateId->SS.getBeginLoc());
902  // End location stays the same
903
904  // Replace the template-id annotation token, and possible the scope-specifier
905  // that precedes it, with the typename annotation token.
906  PP.AnnotateCachedTokens(Tok);
907}
908
909/// \brief Determine whether the given token can end a template argument.
910static bool isEndOfTemplateArgument(Token Tok) {
911  return Tok.is(tok::comma) || Tok.is(tok::greater) ||
912         Tok.is(tok::greatergreater);
913}
914
915/// \brief Parse a C++ template template argument.
916ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
917  if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
918      !Tok.is(tok::annot_cxxscope))
919    return ParsedTemplateArgument();
920
921  // C++0x [temp.arg.template]p1:
922  //   A template-argument for a template template-parameter shall be the name
923  //   of a class template or an alias template, expressed as id-expression.
924  //
925  // We parse an id-expression that refers to a class template or alias
926  // template. The grammar we parse is:
927  //
928  //   nested-name-specifier[opt] template[opt] identifier ...[opt]
929  //
930  // followed by a token that terminates a template argument, such as ',',
931  // '>', or (in some cases) '>>'.
932  CXXScopeSpec SS; // nested-name-specifier, if present
933  ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
934                                 /*EnteringContext=*/false);
935
936  ParsedTemplateArgument Result;
937  SourceLocation EllipsisLoc;
938  if (SS.isSet() && Tok.is(tok::kw_template)) {
939    // Parse the optional 'template' keyword following the
940    // nested-name-specifier.
941    SourceLocation TemplateLoc = ConsumeToken();
942
943    if (Tok.is(tok::identifier)) {
944      // We appear to have a dependent template name.
945      UnqualifiedId Name;
946      Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
947      ConsumeToken(); // the identifier
948
949      // Parse the ellipsis.
950      if (Tok.is(tok::ellipsis))
951        EllipsisLoc = ConsumeToken();
952
953      // If the next token signals the end of a template argument,
954      // then we have a dependent template name that could be a template
955      // template argument.
956      TemplateTy Template;
957      if (isEndOfTemplateArgument(Tok) &&
958          Actions.ActOnDependentTemplateName(getCurScope(), TemplateLoc,
959                                             SS, Name,
960                                             /*ObjectType=*/ ParsedType(),
961                                             /*EnteringContext=*/false,
962                                             Template))
963        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
964    }
965  } else if (Tok.is(tok::identifier)) {
966    // We may have a (non-dependent) template name.
967    TemplateTy Template;
968    UnqualifiedId Name;
969    Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
970    ConsumeToken(); // the identifier
971
972    // Parse the ellipsis.
973    if (Tok.is(tok::ellipsis))
974      EllipsisLoc = ConsumeToken();
975
976    if (isEndOfTemplateArgument(Tok)) {
977      bool MemberOfUnknownSpecialization;
978      TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
979                                               /*hasTemplateKeyword=*/false,
980                                                    Name,
981                                               /*ObjectType=*/ ParsedType(),
982                                                    /*EnteringContext=*/false,
983                                                    Template,
984                                                MemberOfUnknownSpecialization);
985      if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
986        // We have an id-expression that refers to a class template or
987        // (C++0x) alias template.
988        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
989      }
990    }
991  }
992
993  // If this is a pack expansion, build it as such.
994  if (EllipsisLoc.isValid() && !Result.isInvalid())
995    Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
996
997  return Result;
998}
999
1000/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1001///
1002///       template-argument: [C++ 14.2]
1003///         constant-expression
1004///         type-id
1005///         id-expression
1006ParsedTemplateArgument Parser::ParseTemplateArgument() {
1007  // C++ [temp.arg]p2:
1008  //   In a template-argument, an ambiguity between a type-id and an
1009  //   expression is resolved to a type-id, regardless of the form of
1010  //   the corresponding template-parameter.
1011  //
1012  // Therefore, we initially try to parse a type-id.
1013  if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1014    SourceLocation Loc = Tok.getLocation();
1015    TypeResult TypeArg = ParseTypeName(/*Range=*/0,
1016                                       Declarator::TemplateTypeArgContext);
1017    if (TypeArg.isInvalid())
1018      return ParsedTemplateArgument();
1019
1020    return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1021                                  TypeArg.get().getAsOpaquePtr(),
1022                                  Loc);
1023  }
1024
1025  // Try to parse a template template argument.
1026  {
1027    TentativeParsingAction TPA(*this);
1028
1029    ParsedTemplateArgument TemplateTemplateArgument
1030      = ParseTemplateTemplateArgument();
1031    if (!TemplateTemplateArgument.isInvalid()) {
1032      TPA.Commit();
1033      return TemplateTemplateArgument;
1034    }
1035
1036    // Revert this tentative parse to parse a non-type template argument.
1037    TPA.Revert();
1038  }
1039
1040  // Parse a non-type template argument.
1041  SourceLocation Loc = Tok.getLocation();
1042  ExprResult ExprArg = ParseConstantExpression();
1043  if (ExprArg.isInvalid() || !ExprArg.get())
1044    return ParsedTemplateArgument();
1045
1046  return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1047                                ExprArg.release(), Loc);
1048}
1049
1050/// \brief Determine whether the current tokens can only be parsed as a
1051/// template argument list (starting with the '<') and never as a '<'
1052/// expression.
1053bool Parser::IsTemplateArgumentList(unsigned Skip) {
1054  struct AlwaysRevertAction : TentativeParsingAction {
1055    AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1056    ~AlwaysRevertAction() { Revert(); }
1057  } Tentative(*this);
1058
1059  while (Skip) {
1060    ConsumeToken();
1061    --Skip;
1062  }
1063
1064  // '<'
1065  if (!Tok.is(tok::less))
1066    return false;
1067  ConsumeToken();
1068
1069  // An empty template argument list.
1070  if (Tok.is(tok::greater))
1071    return true;
1072
1073  // See whether we have declaration specifiers, which indicate a type.
1074  while (isCXXDeclarationSpecifier() == TPResult::True())
1075    ConsumeToken();
1076
1077  // If we have a '>' or a ',' then this is a template argument list.
1078  return Tok.is(tok::greater) || Tok.is(tok::comma);
1079}
1080
1081/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1082/// (C++ [temp.names]). Returns true if there was an error.
1083///
1084///       template-argument-list: [C++ 14.2]
1085///         template-argument
1086///         template-argument-list ',' template-argument
1087bool
1088Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1089  while (true) {
1090    ParsedTemplateArgument Arg = ParseTemplateArgument();
1091    if (Tok.is(tok::ellipsis)) {
1092      SourceLocation EllipsisLoc  = ConsumeToken();
1093      Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1094    }
1095
1096    if (Arg.isInvalid()) {
1097      SkipUntil(tok::comma, tok::greater, true, true);
1098      return true;
1099    }
1100
1101    // Save this template argument.
1102    TemplateArgs.push_back(Arg);
1103
1104    // If the next token is a comma, consume it and keep reading
1105    // arguments.
1106    if (Tok.isNot(tok::comma)) break;
1107
1108    // Consume the comma.
1109    ConsumeToken();
1110  }
1111
1112  return false;
1113}
1114
1115/// \brief Parse a C++ explicit template instantiation
1116/// (C++ [temp.explicit]).
1117///
1118///       explicit-instantiation:
1119///         'extern' [opt] 'template' declaration
1120///
1121/// Note that the 'extern' is a GNU extension and C++0x feature.
1122Decl *Parser::ParseExplicitInstantiation(SourceLocation ExternLoc,
1123                                         SourceLocation TemplateLoc,
1124                                         SourceLocation &DeclEnd) {
1125  // This isn't really required here.
1126  ParsingDeclRAIIObject ParsingTemplateParams(*this);
1127
1128  return ParseSingleDeclarationAfterTemplate(Declarator::FileContext,
1129                                             ParsedTemplateInfo(ExternLoc,
1130                                                                TemplateLoc),
1131                                             ParsingTemplateParams,
1132                                             DeclEnd, AS_none);
1133}
1134
1135SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1136  if (TemplateParams)
1137    return getTemplateParamsRange(TemplateParams->data(),
1138                                  TemplateParams->size());
1139
1140  SourceRange R(TemplateLoc);
1141  if (ExternLoc.isValid())
1142    R.setBegin(ExternLoc);
1143  return R;
1144}
1145
1146void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) {
1147  ((Parser*)P)->LateTemplateParser(FD);
1148}
1149
1150
1151void Parser::LateTemplateParser(const FunctionDecl *FD) {
1152  LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD];
1153  if (LPT) {
1154    ParseLateTemplatedFuncDef(*LPT);
1155    return;
1156  }
1157
1158  llvm_unreachable("Late templated function without associated lexed tokens");
1159}
1160
1161/// \brief Late parse a C++ function template in Microsoft mode.
1162void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) {
1163  if(!LMT.D)
1164     return;
1165
1166  // If this is a member template, introduce the template parameter scope.
1167  ParseScope TemplateScope(this, Scope::TemplateParamScope);
1168
1169  // Get the FunctionDecl.
1170  FunctionDecl *FD = 0;
1171  if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D))
1172    FD = FunTmpl->getTemplatedDecl();
1173  else
1174    FD = cast<FunctionDecl>(LMT.D);
1175
1176  // Reinject the template parameters.
1177  SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1178  DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD);
1179  if (Declarator && Declarator->getNumTemplateParameterLists() != 0) {
1180    Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator);
1181    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1182  } else {
1183    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1184
1185    // Get the list of DeclContext to reenter.
1186    SmallVector<DeclContext*, 4> DeclContextToReenter;
1187    DeclContext *DD = FD->getLexicalParent();
1188    while (DD && DD->isRecord()) {
1189      DeclContextToReenter.push_back(DD);
1190      DD = DD->getLexicalParent();
1191    }
1192
1193    // Reenter template scopes from outmost to innermost.
1194    SmallVector<DeclContext*, 4>::reverse_iterator II =
1195    DeclContextToReenter.rbegin();
1196    for (; II != DeclContextToReenter.rend(); ++II) {
1197      if (ClassTemplatePartialSpecializationDecl* MD =
1198                dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) {
1199       TemplateParamScopeStack.push_back(new ParseScope(this,
1200                                                   Scope::TemplateParamScope));
1201        Actions.ActOnReenterTemplateScope(getCurScope(), MD);
1202      } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) {
1203        TemplateParamScopeStack.push_back(new ParseScope(this,
1204                                                    Scope::TemplateParamScope,
1205                                       MD->getDescribedClassTemplate() != 0 ));
1206        Actions.ActOnReenterTemplateScope(getCurScope(),
1207                                          MD->getDescribedClassTemplate());
1208      }
1209    }
1210  }
1211  assert(!LMT.Toks.empty() && "Empty body!");
1212
1213  // Append the current token at the end of the new token stream so that it
1214  // doesn't get lost.
1215  LMT.Toks.push_back(Tok);
1216  PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false);
1217
1218  // Consume the previously pushed token.
1219  ConsumeAnyToken();
1220  assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try))
1221         && "Inline method not starting with '{', ':' or 'try'");
1222
1223  // Parse the method body. Function body parsing code is similar enough
1224  // to be re-used for method bodies as well.
1225  ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1226
1227  // Recreate the DeclContext.
1228  Sema::ContextRAII SavedContext(Actions, Actions.getContainingDC(FD));
1229
1230  if (FunctionTemplateDecl *FunctionTemplate
1231        = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D))
1232    Actions.ActOnStartOfFunctionDef(getCurScope(),
1233                                   FunctionTemplate->getTemplatedDecl());
1234  if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D))
1235    Actions.ActOnStartOfFunctionDef(getCurScope(), Function);
1236
1237
1238  if (Tok.is(tok::kw_try)) {
1239    ParseFunctionTryBlock(LMT.D, FnScope);
1240  } else {
1241    if (Tok.is(tok::colon))
1242      ParseConstructorInitializer(LMT.D);
1243    else
1244      Actions.ActOnDefaultCtorInitializers(LMT.D);
1245
1246    if (Tok.is(tok::l_brace)) {
1247      ParseFunctionStatementBody(LMT.D, FnScope);
1248      Actions.MarkAsLateParsedTemplate(FD, false);
1249    } else
1250      Actions.ActOnFinishFunctionBody(LMT.D, 0);
1251  }
1252
1253  // Exit scopes.
1254  FnScope.Exit();
1255  SmallVector<ParseScope*, 4>::reverse_iterator I =
1256   TemplateParamScopeStack.rbegin();
1257  for (; I != TemplateParamScopeStack.rend(); ++I)
1258    delete *I;
1259
1260  DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D);
1261  if (grp)
1262    Actions.getASTConsumer().HandleTopLevelDecl(grp.get());
1263}
1264
1265/// \brief Lex a delayed template function for late parsing.
1266void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1267  tok::TokenKind kind = Tok.getKind();
1268  if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1269    // Consume everything up to (and including) the matching right brace.
1270    ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1271  }
1272
1273  // If we're in a function-try-block, we need to store all the catch blocks.
1274  if (kind == tok::kw_try) {
1275    while (Tok.is(tok::kw_catch)) {
1276      ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1277      ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1278    }
1279  }
1280}
1281