ParseTemplate.cpp revision 55d23c925b058be29b792008ddb7d68f6c4fa9a0 
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(Context,
35                                      SourceLocation(), ConsumeToken(),
36                                      DeclEnd, AS);
37  }
38  return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
39                                                  AccessAttrs);
40}
41
42/// \brief RAII class that manages the template parameter depth.
43namespace {
44  class TemplateParameterDepthCounter {
45    unsigned &Depth;
46    unsigned AddedLevels;
47
48  public:
49    explicit TemplateParameterDepthCounter(unsigned &Depth)
50      : Depth(Depth), AddedLevels(0) { }
51
52    ~TemplateParameterDepthCounter() {
53      Depth -= AddedLevels;
54    }
55
56    void operator++() {
57      ++Depth;
58      ++AddedLevels;
59    }
60
61    operator unsigned() const { return Depth; }
62  };
63}
64
65/// \brief Parse a template declaration or an explicit specialization.
66///
67/// Template declarations include one or more template parameter lists
68/// and either the function or class template declaration. Explicit
69/// specializations contain one or more 'template < >' prefixes
70/// followed by a (possibly templated) declaration. Since the
71/// syntactic form of both features is nearly identical, we parse all
72/// of the template headers together and let semantic analysis sort
73/// the declarations from the explicit specializations.
74///
75///       template-declaration: [C++ temp]
76///         'export'[opt] 'template' '<' template-parameter-list '>' declaration
77///
78///       explicit-specialization: [ C++ temp.expl.spec]
79///         'template' '<' '>' declaration
80Decl *
81Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
82                                                 SourceLocation &DeclEnd,
83                                                 AccessSpecifier AS,
84                                                 AttributeList *AccessAttrs) {
85  assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
86         "Token does not start a template declaration.");
87
88  // Enter template-parameter scope.
89  ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
90
91  // Tell the action that names should be checked in the context of
92  // the declaration to come.
93  ParsingDeclRAIIObject ParsingTemplateParams(*this);
94
95  // Parse multiple levels of template headers within this template
96  // parameter scope, e.g.,
97  //
98  //   template<typename T>
99  //     template<typename U>
100  //       class A<T>::B { ... };
101  //
102  // We parse multiple levels non-recursively so that we can build a
103  // single data structure containing all of the template parameter
104  // lists to easily differentiate between the case above and:
105  //
106  //   template<typename T>
107  //   class A {
108  //     template<typename U> class B;
109  //   };
110  //
111  // In the first case, the action for declaring A<T>::B receives
112  // both template parameter lists. In the second case, the action for
113  // defining A<T>::B receives just the inner template parameter list
114  // (and retrieves the outer template parameter list from its
115  // context).
116  bool isSpecialization = true;
117  bool LastParamListWasEmpty = false;
118  TemplateParameterLists ParamLists;
119  TemplateParameterDepthCounter Depth(TemplateParameterDepth);
120  do {
121    // Consume the 'export', if any.
122    SourceLocation ExportLoc;
123    if (Tok.is(tok::kw_export)) {
124      ExportLoc = ConsumeToken();
125    }
126
127    // Consume the 'template', which should be here.
128    SourceLocation TemplateLoc;
129    if (Tok.is(tok::kw_template)) {
130      TemplateLoc = ConsumeToken();
131    } else {
132      Diag(Tok.getLocation(), diag::err_expected_template);
133      return 0;
134    }
135
136    // Parse the '<' template-parameter-list '>'
137    SourceLocation LAngleLoc, RAngleLoc;
138    SmallVector<Decl*, 4> TemplateParams;
139    if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc,
140                                RAngleLoc)) {
141      // Skip until the semi-colon or a }.
142      SkipUntil(tok::r_brace, true, true);
143      if (Tok.is(tok::semi))
144        ConsumeToken();
145      return 0;
146    }
147
148    ParamLists.push_back(
149      Actions.ActOnTemplateParameterList(Depth, ExportLoc,
150                                         TemplateLoc, LAngleLoc,
151                                         TemplateParams.data(),
152                                         TemplateParams.size(), RAngleLoc));
153
154    if (!TemplateParams.empty()) {
155      isSpecialization = false;
156      ++Depth;
157    } else {
158      LastParamListWasEmpty = true;
159    }
160  } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
161
162  // Parse the actual template declaration.
163  return ParseSingleDeclarationAfterTemplate(Context,
164                                             ParsedTemplateInfo(&ParamLists,
165                                                             isSpecialization,
166                                                         LastParamListWasEmpty),
167                                             ParsingTemplateParams,
168                                             DeclEnd, AS, AccessAttrs);
169}
170
171/// \brief Parse a single declaration that declares a template,
172/// template specialization, or explicit instantiation of a template.
173///
174/// \param TemplateParams if non-NULL, the template parameter lists
175/// that preceded this declaration. In this case, the declaration is a
176/// template declaration, out-of-line definition of a template, or an
177/// explicit template specialization. When NULL, the declaration is an
178/// explicit template instantiation.
179///
180/// \param TemplateLoc when TemplateParams is NULL, the location of
181/// the 'template' keyword that indicates that we have an explicit
182/// template instantiation.
183///
184/// \param DeclEnd will receive the source location of the last token
185/// within this declaration.
186///
187/// \param AS the access specifier associated with this
188/// declaration. Will be AS_none for namespace-scope declarations.
189///
190/// \returns the new declaration.
191Decl *
192Parser::ParseSingleDeclarationAfterTemplate(
193                                       unsigned Context,
194                                       const ParsedTemplateInfo &TemplateInfo,
195                                       ParsingDeclRAIIObject &DiagsFromTParams,
196                                       SourceLocation &DeclEnd,
197                                       AccessSpecifier AS,
198                                       AttributeList *AccessAttrs) {
199  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
200         "Template information required");
201
202  if (Context == Declarator::MemberContext) {
203    // We are parsing a member template.
204    ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
205                                   &DiagsFromTParams);
206    return 0;
207  }
208
209  ParsedAttributesWithRange prefixAttrs(AttrFactory);
210  MaybeParseCXX0XAttributes(prefixAttrs);
211
212  if (Tok.is(tok::kw_using))
213    return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
214                                            prefixAttrs);
215
216  // Parse the declaration specifiers, stealing the accumulated
217  // diagnostics from the template parameters.
218  ParsingDeclSpec DS(*this, &DiagsFromTParams);
219
220  DS.takeAttributesFrom(prefixAttrs);
221
222  ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
223                             getDeclSpecContextFromDeclaratorContext(Context));
224
225  if (Tok.is(tok::semi)) {
226    DeclEnd = ConsumeToken();
227    Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
228    DS.complete(Decl);
229    return Decl;
230  }
231
232  // Parse the declarator.
233  ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
234  ParseDeclarator(DeclaratorInfo);
235  // Error parsing the declarator?
236  if (!DeclaratorInfo.hasName()) {
237    // If so, skip until the semi-colon or a }.
238    SkipUntil(tok::r_brace, true, true);
239    if (Tok.is(tok::semi))
240      ConsumeToken();
241    return 0;
242  }
243
244  // If we have a declaration or declarator list, handle it.
245  if (isDeclarationAfterDeclarator()) {
246    // Parse this declaration.
247    Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
248                                                     TemplateInfo);
249
250    if (Tok.is(tok::comma)) {
251      Diag(Tok, diag::err_multiple_template_declarators)
252        << (int)TemplateInfo.Kind;
253      SkipUntil(tok::semi, true, false);
254      return ThisDecl;
255    }
256
257    // Eat the semi colon after the declaration.
258    ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration);
259    DeclaratorInfo.complete(ThisDecl);
260    return ThisDecl;
261  }
262
263  if (DeclaratorInfo.isFunctionDeclarator() &&
264      isStartOfFunctionDefinition(DeclaratorInfo)) {
265    if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
266      // Recover by ignoring the 'typedef'. This was probably supposed to be
267      // the 'typename' keyword, which we should have already suggested adding
268      // if it's appropriate.
269      Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
270        << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
271      DS.ClearStorageClassSpecs();
272    }
273    return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo);
274  }
275
276  if (DeclaratorInfo.isFunctionDeclarator())
277    Diag(Tok, diag::err_expected_fn_body);
278  else
279    Diag(Tok, diag::err_invalid_token_after_toplevel_declarator);
280  SkipUntil(tok::semi);
281  return 0;
282}
283
284/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
285/// angle brackets. Depth is the depth of this template-parameter-list, which
286/// is the number of template headers directly enclosing this template header.
287/// TemplateParams is the current list of template parameters we're building.
288/// The template parameter we parse will be added to this list. LAngleLoc and
289/// RAngleLoc will receive the positions of the '<' and '>', respectively,
290/// that enclose this template parameter list.
291///
292/// \returns true if an error occurred, false otherwise.
293bool Parser::ParseTemplateParameters(unsigned Depth,
294                               SmallVectorImpl<Decl*> &TemplateParams,
295                                     SourceLocation &LAngleLoc,
296                                     SourceLocation &RAngleLoc) {
297  // Get the template parameter list.
298  if (!Tok.is(tok::less)) {
299    Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
300    return true;
301  }
302  LAngleLoc = ConsumeToken();
303
304  // Try to parse the template parameter list.
305  if (Tok.is(tok::greater))
306    RAngleLoc = ConsumeToken();
307  else if (ParseTemplateParameterList(Depth, TemplateParams)) {
308    if (!Tok.is(tok::greater)) {
309      Diag(Tok.getLocation(), diag::err_expected_greater);
310      return true;
311    }
312    RAngleLoc = ConsumeToken();
313  }
314  return false;
315}
316
317/// ParseTemplateParameterList - Parse a template parameter list. If
318/// the parsing fails badly (i.e., closing bracket was left out), this
319/// will try to put the token stream in a reasonable position (closing
320/// a statement, etc.) and return false.
321///
322///       template-parameter-list:    [C++ temp]
323///         template-parameter
324///         template-parameter-list ',' template-parameter
325bool
326Parser::ParseTemplateParameterList(unsigned Depth,
327                             SmallVectorImpl<Decl*> &TemplateParams) {
328  while (1) {
329    if (Decl *TmpParam
330          = ParseTemplateParameter(Depth, TemplateParams.size())) {
331      TemplateParams.push_back(TmpParam);
332    } else {
333      // If we failed to parse a template parameter, skip until we find
334      // a comma or closing brace.
335      SkipUntil(tok::comma, tok::greater, true, true);
336    }
337
338    // Did we find a comma or the end of the template parmeter list?
339    if (Tok.is(tok::comma)) {
340      ConsumeToken();
341    } else if (Tok.is(tok::greater)) {
342      // Don't consume this... that's done by template parser.
343      break;
344    } else {
345      // Somebody probably forgot to close the template. Skip ahead and
346      // try to get out of the expression. This error is currently
347      // subsumed by whatever goes on in ParseTemplateParameter.
348      // TODO: This could match >>, and it would be nice to avoid those
349      // silly errors with template <vec<T>>.
350      Diag(Tok.getLocation(), diag::err_expected_comma_greater);
351      SkipUntil(tok::greater, true, true);
352      return false;
353    }
354  }
355  return true;
356}
357
358/// \brief Determine whether the parser is at the start of a template
359/// type parameter.
360bool Parser::isStartOfTemplateTypeParameter() {
361  if (Tok.is(tok::kw_class)) {
362    // "class" may be the start of an elaborated-type-specifier or a
363    // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
364    switch (NextToken().getKind()) {
365    case tok::equal:
366    case tok::comma:
367    case tok::greater:
368    case tok::greatergreater:
369    case tok::ellipsis:
370      return true;
371
372    case tok::identifier:
373      // This may be either a type-parameter or an elaborated-type-specifier.
374      // We have to look further.
375      break;
376
377    default:
378      return false;
379    }
380
381    switch (GetLookAheadToken(2).getKind()) {
382    case tok::equal:
383    case tok::comma:
384    case tok::greater:
385    case tok::greatergreater:
386      return true;
387
388    default:
389      return false;
390    }
391  }
392
393  if (Tok.isNot(tok::kw_typename))
394    return false;
395
396  // C++ [temp.param]p2:
397  //   There is no semantic difference between class and typename in a
398  //   template-parameter. typename followed by an unqualified-id
399  //   names a template type parameter. typename followed by a
400  //   qualified-id denotes the type in a non-type
401  //   parameter-declaration.
402  Token Next = NextToken();
403
404  // If we have an identifier, skip over it.
405  if (Next.getKind() == tok::identifier)
406    Next = GetLookAheadToken(2);
407
408  switch (Next.getKind()) {
409  case tok::equal:
410  case tok::comma:
411  case tok::greater:
412  case tok::greatergreater:
413  case tok::ellipsis:
414    return true;
415
416  default:
417    return false;
418  }
419}
420
421/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
422///
423///       template-parameter: [C++ temp.param]
424///         type-parameter
425///         parameter-declaration
426///
427///       type-parameter: (see below)
428///         'class' ...[opt] identifier[opt]
429///         'class' identifier[opt] '=' type-id
430///         'typename' ...[opt] identifier[opt]
431///         'typename' identifier[opt] '=' type-id
432///         'template' '<' template-parameter-list '>'
433///               'class' ...[opt] identifier[opt]
434///         'template' '<' template-parameter-list '>' 'class' identifier[opt]
435///               = id-expression
436Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
437  if (isStartOfTemplateTypeParameter())
438    return ParseTypeParameter(Depth, Position);
439
440  if (Tok.is(tok::kw_template))
441    return ParseTemplateTemplateParameter(Depth, Position);
442
443  // If it's none of the above, then it must be a parameter declaration.
444  // NOTE: This will pick up errors in the closure of the template parameter
445  // list (e.g., template < ; Check here to implement >> style closures.
446  return ParseNonTypeTemplateParameter(Depth, Position);
447}
448
449/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
450/// Other kinds of template parameters are parsed in
451/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
452///
453///       type-parameter:     [C++ temp.param]
454///         'class' ...[opt][C++0x] identifier[opt]
455///         'class' identifier[opt] '=' type-id
456///         'typename' ...[opt][C++0x] identifier[opt]
457///         'typename' identifier[opt] '=' type-id
458Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
459  assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) &&
460         "A type-parameter starts with 'class' or 'typename'");
461
462  // Consume the 'class' or 'typename' keyword.
463  bool TypenameKeyword = Tok.is(tok::kw_typename);
464  SourceLocation KeyLoc = ConsumeToken();
465
466  // Grab the ellipsis (if given).
467  bool Ellipsis = false;
468  SourceLocation EllipsisLoc;
469  if (Tok.is(tok::ellipsis)) {
470    Ellipsis = true;
471    EllipsisLoc = ConsumeToken();
472
473    Diag(EllipsisLoc,
474         getLang().CPlusPlus0x
475           ? diag::warn_cxx98_compat_variadic_templates
476           : diag::ext_variadic_templates);
477  }
478
479  // Grab the template parameter name (if given)
480  SourceLocation NameLoc;
481  IdentifierInfo* ParamName = 0;
482  if (Tok.is(tok::identifier)) {
483    ParamName = Tok.getIdentifierInfo();
484    NameLoc = ConsumeToken();
485  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
486            Tok.is(tok::greater)) {
487    // Unnamed template parameter. Don't have to do anything here, just
488    // don't consume this token.
489  } else {
490    Diag(Tok.getLocation(), diag::err_expected_ident);
491    return 0;
492  }
493
494  // Grab a default argument (if available).
495  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
496  // we introduce the type parameter into the local scope.
497  SourceLocation EqualLoc;
498  ParsedType DefaultArg;
499  if (Tok.is(tok::equal)) {
500    EqualLoc = ConsumeToken();
501    DefaultArg = ParseTypeName().get();
502  }
503
504  return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis,
505                                    EllipsisLoc, KeyLoc, ParamName, NameLoc,
506                                    Depth, Position, EqualLoc, DefaultArg);
507}
508
509/// ParseTemplateTemplateParameter - Handle the parsing of template
510/// template parameters.
511///
512///       type-parameter:    [C++ temp.param]
513///         'template' '<' template-parameter-list '>' 'class'
514///                  ...[opt] identifier[opt]
515///         'template' '<' template-parameter-list '>' 'class' identifier[opt]
516///                  = id-expression
517Decl *
518Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
519  assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
520
521  // Handle the template <...> part.
522  SourceLocation TemplateLoc = ConsumeToken();
523  SmallVector<Decl*,8> TemplateParams;
524  SourceLocation LAngleLoc, RAngleLoc;
525  {
526    ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
527    if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
528                               RAngleLoc)) {
529      return 0;
530    }
531  }
532
533  // Generate a meaningful error if the user forgot to put class before the
534  // identifier, comma, or greater.
535  if (!Tok.is(tok::kw_class)) {
536    Diag(Tok.getLocation(), diag::err_expected_class_before)
537      << PP.getSpelling(Tok);
538    return 0;
539  }
540  ConsumeToken();
541
542  // Parse the ellipsis, if given.
543  SourceLocation EllipsisLoc;
544  if (Tok.is(tok::ellipsis)) {
545    EllipsisLoc = ConsumeToken();
546
547    Diag(EllipsisLoc,
548         getLang().CPlusPlus0x
549           ? diag::warn_cxx98_compat_variadic_templates
550           : diag::ext_variadic_templates);
551  }
552
553  // Get the identifier, if given.
554  SourceLocation NameLoc;
555  IdentifierInfo* ParamName = 0;
556  if (Tok.is(tok::identifier)) {
557    ParamName = Tok.getIdentifierInfo();
558    NameLoc = ConsumeToken();
559  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) {
560    // Unnamed template parameter. Don't have to do anything here, just
561    // don't consume this token.
562  } else {
563    Diag(Tok.getLocation(), diag::err_expected_ident);
564    return 0;
565  }
566
567  TemplateParameterList *ParamList =
568    Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
569                                       TemplateLoc, LAngleLoc,
570                                       TemplateParams.data(),
571                                       TemplateParams.size(),
572                                       RAngleLoc);
573
574  // Grab a default argument (if available).
575  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
576  // we introduce the template parameter into the local scope.
577  SourceLocation EqualLoc;
578  ParsedTemplateArgument DefaultArg;
579  if (Tok.is(tok::equal)) {
580    EqualLoc = ConsumeToken();
581    DefaultArg = ParseTemplateTemplateArgument();
582    if (DefaultArg.isInvalid()) {
583      Diag(Tok.getLocation(),
584           diag::err_default_template_template_parameter_not_template);
585      static const tok::TokenKind EndToks[] = {
586        tok::comma, tok::greater, tok::greatergreater
587      };
588      SkipUntil(EndToks, 3, true, true);
589    }
590  }
591
592  return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
593                                                ParamList, EllipsisLoc,
594                                                ParamName, NameLoc, Depth,
595                                                Position, EqualLoc, DefaultArg);
596}
597
598/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
599/// template parameters (e.g., in "template<int Size> class array;").
600///
601///       template-parameter:
602///         ...
603///         parameter-declaration
604Decl *
605Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
606  // Parse the declaration-specifiers (i.e., the type).
607  // FIXME: The type should probably be restricted in some way... Not all
608  // declarators (parts of declarators?) are accepted for parameters.
609  DeclSpec DS(AttrFactory);
610  ParseDeclarationSpecifiers(DS);
611
612  // Parse this as a typename.
613  Declarator ParamDecl(DS, Declarator::TemplateParamContext);
614  ParseDeclarator(ParamDecl);
615  if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
616    // This probably shouldn't happen - and it's more of a Sema thing, but
617    // basically we didn't parse the type name because we couldn't associate
618    // it with an AST node. we should just skip to the comma or greater.
619    // TODO: This is currently a placeholder for some kind of Sema Error.
620    Diag(Tok.getLocation(), diag::err_parse_error);
621    SkipUntil(tok::comma, tok::greater, true, true);
622    return 0;
623  }
624
625  // If there is a default value, parse it.
626  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
627  // we introduce the template parameter into the local scope.
628  SourceLocation EqualLoc;
629  ExprResult DefaultArg;
630  if (Tok.is(tok::equal)) {
631    EqualLoc = ConsumeToken();
632
633    // C++ [temp.param]p15:
634    //   When parsing a default template-argument for a non-type
635    //   template-parameter, the first non-nested > is taken as the
636    //   end of the template-parameter-list rather than a greater-than
637    //   operator.
638    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
639
640    DefaultArg = ParseAssignmentExpression();
641    if (DefaultArg.isInvalid())
642      SkipUntil(tok::comma, tok::greater, true, true);
643  }
644
645  // Create the parameter.
646  return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
647                                               Depth, Position, EqualLoc,
648                                               DefaultArg.take());
649}
650
651/// \brief Parses a template-id that after the template name has
652/// already been parsed.
653///
654/// This routine takes care of parsing the enclosed template argument
655/// list ('<' template-parameter-list [opt] '>') and placing the
656/// results into a form that can be transferred to semantic analysis.
657///
658/// \param Template the template declaration produced by isTemplateName
659///
660/// \param TemplateNameLoc the source location of the template name
661///
662/// \param SS if non-NULL, the nested-name-specifier preceding the
663/// template name.
664///
665/// \param ConsumeLastToken if true, then we will consume the last
666/// token that forms the template-id. Otherwise, we will leave the
667/// last token in the stream (e.g., so that it can be replaced with an
668/// annotation token).
669bool
670Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
671                                         SourceLocation TemplateNameLoc,
672                                         const CXXScopeSpec &SS,
673                                         bool ConsumeLastToken,
674                                         SourceLocation &LAngleLoc,
675                                         TemplateArgList &TemplateArgs,
676                                         SourceLocation &RAngleLoc) {
677  assert(Tok.is(tok::less) && "Must have already parsed the template-name");
678
679  // Consume the '<'.
680  LAngleLoc = ConsumeToken();
681
682  // Parse the optional template-argument-list.
683  bool Invalid = false;
684  {
685    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
686    if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
687      Invalid = ParseTemplateArgumentList(TemplateArgs);
688
689    if (Invalid) {
690      // Try to find the closing '>'.
691      SkipUntil(tok::greater, true, !ConsumeLastToken);
692
693      return true;
694    }
695  }
696
697  if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) {
698    Diag(Tok.getLocation(), diag::err_expected_greater);
699    return true;
700  }
701
702  // Determine the location of the '>' or '>>'. Only consume this
703  // token if the caller asked us to.
704  RAngleLoc = Tok.getLocation();
705
706  if (Tok.is(tok::greatergreater)) {
707    const char *ReplaceStr = "> >";
708    if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
709      ReplaceStr = "> > ";
710
711    Diag(Tok.getLocation(), getLang().CPlusPlus0x ?
712         diag::warn_cxx98_compat_two_right_angle_brackets :
713         diag::err_two_right_angle_brackets_need_space)
714      << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()),
715                                      ReplaceStr);
716
717    Tok.setKind(tok::greater);
718    if (!ConsumeLastToken) {
719      // Since we're not supposed to consume the '>>' token, we need
720      // to insert a second '>' token after the first.
721      PP.EnterToken(Tok);
722    }
723  } else if (ConsumeLastToken)
724    ConsumeToken();
725
726  return false;
727}
728
729/// \brief Replace the tokens that form a simple-template-id with an
730/// annotation token containing the complete template-id.
731///
732/// The first token in the stream must be the name of a template that
733/// is followed by a '<'. This routine will parse the complete
734/// simple-template-id and replace the tokens with a single annotation
735/// token with one of two different kinds: if the template-id names a
736/// type (and \p AllowTypeAnnotation is true), the annotation token is
737/// a type annotation that includes the optional nested-name-specifier
738/// (\p SS). Otherwise, the annotation token is a template-id
739/// annotation that does not include the optional
740/// nested-name-specifier.
741///
742/// \param Template  the declaration of the template named by the first
743/// token (an identifier), as returned from \c Action::isTemplateName().
744///
745/// \param TemplateNameKind the kind of template that \p Template
746/// refers to, as returned from \c Action::isTemplateName().
747///
748/// \param SS if non-NULL, the nested-name-specifier that precedes
749/// this template name.
750///
751/// \param TemplateKWLoc if valid, specifies that this template-id
752/// annotation was preceded by the 'template' keyword and gives the
753/// location of that keyword. If invalid (the default), then this
754/// template-id was not preceded by a 'template' keyword.
755///
756/// \param AllowTypeAnnotation if true (the default), then a
757/// simple-template-id that refers to a class template, template
758/// template parameter, or other template that produces a type will be
759/// replaced with a type annotation token. Otherwise, the
760/// simple-template-id is always replaced with a template-id
761/// annotation token.
762///
763/// If an unrecoverable parse error occurs and no annotation token can be
764/// formed, this function returns true.
765///
766bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
767                                     CXXScopeSpec &SS,
768                                     SourceLocation TemplateKWLoc,
769                                     UnqualifiedId &TemplateName,
770                                     bool AllowTypeAnnotation) {
771  assert(getLang().CPlusPlus && "Can only annotate template-ids in C++");
772  assert(Template && Tok.is(tok::less) &&
773         "Parser isn't at the beginning of a template-id");
774
775  // Consume the template-name.
776  SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
777
778  // Parse the enclosed template argument list.
779  SourceLocation LAngleLoc, RAngleLoc;
780  TemplateArgList TemplateArgs;
781  bool Invalid = ParseTemplateIdAfterTemplateName(Template,
782                                                  TemplateNameLoc,
783                                                  SS, false, LAngleLoc,
784                                                  TemplateArgs,
785                                                  RAngleLoc);
786
787  if (Invalid) {
788    // If we failed to parse the template ID but skipped ahead to a >, we're not
789    // going to be able to form a token annotation.  Eat the '>' if present.
790    if (Tok.is(tok::greater))
791      ConsumeToken();
792    return true;
793  }
794
795  ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
796                                     TemplateArgs.size());
797
798  // Build the annotation token.
799  if (TNK == TNK_Type_template && AllowTypeAnnotation) {
800    TypeResult Type
801      = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
802                                    Template, TemplateNameLoc,
803                                    LAngleLoc, TemplateArgsPtr, RAngleLoc);
804    if (Type.isInvalid()) {
805      // If we failed to parse the template ID but skipped ahead to a >, we're not
806      // going to be able to form a token annotation.  Eat the '>' if present.
807      if (Tok.is(tok::greater))
808        ConsumeToken();
809      return true;
810    }
811
812    Tok.setKind(tok::annot_typename);
813    setTypeAnnotation(Tok, Type.get());
814    if (SS.isNotEmpty())
815      Tok.setLocation(SS.getBeginLoc());
816    else if (TemplateKWLoc.isValid())
817      Tok.setLocation(TemplateKWLoc);
818    else
819      Tok.setLocation(TemplateNameLoc);
820  } else {
821    // Build a template-id annotation token that can be processed
822    // later.
823    Tok.setKind(tok::annot_template_id);
824    TemplateIdAnnotation *TemplateId
825      = TemplateIdAnnotation::Allocate(TemplateArgs.size());
826    TemplateId->TemplateNameLoc = TemplateNameLoc;
827    if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
828      TemplateId->Name = TemplateName.Identifier;
829      TemplateId->Operator = OO_None;
830    } else {
831      TemplateId->Name = 0;
832      TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
833    }
834    TemplateId->SS = SS;
835    TemplateId->TemplateKWLoc = TemplateKWLoc;
836    TemplateId->Template = Template;
837    TemplateId->Kind = TNK;
838    TemplateId->LAngleLoc = LAngleLoc;
839    TemplateId->RAngleLoc = RAngleLoc;
840    ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
841    for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
842      Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]);
843    Tok.setAnnotationValue(TemplateId);
844    if (TemplateKWLoc.isValid())
845      Tok.setLocation(TemplateKWLoc);
846    else
847      Tok.setLocation(TemplateNameLoc);
848
849    TemplateArgsPtr.release();
850  }
851
852  // Common fields for the annotation token
853  Tok.setAnnotationEndLoc(RAngleLoc);
854
855  // In case the tokens were cached, have Preprocessor replace them with the
856  // annotation token.
857  PP.AnnotateCachedTokens(Tok);
858  return false;
859}
860
861/// \brief Replaces a template-id annotation token with a type
862/// annotation token.
863///
864/// If there was a failure when forming the type from the template-id,
865/// a type annotation token will still be created, but will have a
866/// NULL type pointer to signify an error.
867void Parser::AnnotateTemplateIdTokenAsType() {
868  assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
869
870  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
871  assert((TemplateId->Kind == TNK_Type_template ||
872          TemplateId->Kind == TNK_Dependent_template_name) &&
873         "Only works for type and dependent templates");
874
875  ASTTemplateArgsPtr TemplateArgsPtr(Actions,
876                                     TemplateId->getTemplateArgs(),
877                                     TemplateId->NumArgs);
878
879  TypeResult Type
880    = Actions.ActOnTemplateIdType(TemplateId->SS,
881                                  TemplateId->TemplateKWLoc,
882                                  TemplateId->Template,
883                                  TemplateId->TemplateNameLoc,
884                                  TemplateId->LAngleLoc,
885                                  TemplateArgsPtr,
886                                  TemplateId->RAngleLoc);
887  // Create the new "type" annotation token.
888  Tok.setKind(tok::annot_typename);
889  setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
890  if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
891    Tok.setLocation(TemplateId->SS.getBeginLoc());
892  // End location stays the same
893
894  // Replace the template-id annotation token, and possible the scope-specifier
895  // that precedes it, with the typename annotation token.
896  PP.AnnotateCachedTokens(Tok);
897}
898
899/// \brief Determine whether the given token can end a template argument.
900static bool isEndOfTemplateArgument(Token Tok) {
901  return Tok.is(tok::comma) || Tok.is(tok::greater) ||
902         Tok.is(tok::greatergreater);
903}
904
905/// \brief Parse a C++ template template argument.
906ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
907  if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
908      !Tok.is(tok::annot_cxxscope))
909    return ParsedTemplateArgument();
910
911  // C++0x [temp.arg.template]p1:
912  //   A template-argument for a template template-parameter shall be the name
913  //   of a class template or an alias template, expressed as id-expression.
914  //
915  // We parse an id-expression that refers to a class template or alias
916  // template. The grammar we parse is:
917  //
918  //   nested-name-specifier[opt] template[opt] identifier ...[opt]
919  //
920  // followed by a token that terminates a template argument, such as ',',
921  // '>', or (in some cases) '>>'.
922  CXXScopeSpec SS; // nested-name-specifier, if present
923  ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
924                                 /*EnteringContext=*/false);
925
926  ParsedTemplateArgument Result;
927  SourceLocation EllipsisLoc;
928  if (SS.isSet() && Tok.is(tok::kw_template)) {
929    // Parse the optional 'template' keyword following the
930    // nested-name-specifier.
931    SourceLocation TemplateKWLoc = ConsumeToken();
932
933    if (Tok.is(tok::identifier)) {
934      // We appear to have a dependent template name.
935      UnqualifiedId Name;
936      Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
937      ConsumeToken(); // the identifier
938
939      // Parse the ellipsis.
940      if (Tok.is(tok::ellipsis))
941        EllipsisLoc = ConsumeToken();
942
943      // If the next token signals the end of a template argument,
944      // then we have a dependent template name that could be a template
945      // template argument.
946      TemplateTy Template;
947      if (isEndOfTemplateArgument(Tok) &&
948          Actions.ActOnDependentTemplateName(getCurScope(),
949                                             SS, TemplateKWLoc, Name,
950                                             /*ObjectType=*/ ParsedType(),
951                                             /*EnteringContext=*/false,
952                                             Template))
953        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
954    }
955  } else if (Tok.is(tok::identifier)) {
956    // We may have a (non-dependent) template name.
957    TemplateTy Template;
958    UnqualifiedId Name;
959    Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
960    ConsumeToken(); // the identifier
961
962    // Parse the ellipsis.
963    if (Tok.is(tok::ellipsis))
964      EllipsisLoc = ConsumeToken();
965
966    if (isEndOfTemplateArgument(Tok)) {
967      bool MemberOfUnknownSpecialization;
968      TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
969                                               /*hasTemplateKeyword=*/false,
970                                                    Name,
971                                               /*ObjectType=*/ ParsedType(),
972                                                    /*EnteringContext=*/false,
973                                                    Template,
974                                                MemberOfUnknownSpecialization);
975      if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
976        // We have an id-expression that refers to a class template or
977        // (C++0x) alias template.
978        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
979      }
980    }
981  }
982
983  // If this is a pack expansion, build it as such.
984  if (EllipsisLoc.isValid() && !Result.isInvalid())
985    Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
986
987  return Result;
988}
989
990/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
991///
992///       template-argument: [C++ 14.2]
993///         constant-expression
994///         type-id
995///         id-expression
996ParsedTemplateArgument Parser::ParseTemplateArgument() {
997  // C++ [temp.arg]p2:
998  //   In a template-argument, an ambiguity between a type-id and an
999  //   expression is resolved to a type-id, regardless of the form of
1000  //   the corresponding template-parameter.
1001  //
1002  // Therefore, we initially try to parse a type-id.
1003  if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1004    SourceLocation Loc = Tok.getLocation();
1005    TypeResult TypeArg = ParseTypeName(/*Range=*/0,
1006                                       Declarator::TemplateTypeArgContext);
1007    if (TypeArg.isInvalid())
1008      return ParsedTemplateArgument();
1009
1010    return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1011                                  TypeArg.get().getAsOpaquePtr(),
1012                                  Loc);
1013  }
1014
1015  // Try to parse a template template argument.
1016  {
1017    TentativeParsingAction TPA(*this);
1018
1019    ParsedTemplateArgument TemplateTemplateArgument
1020      = ParseTemplateTemplateArgument();
1021    if (!TemplateTemplateArgument.isInvalid()) {
1022      TPA.Commit();
1023      return TemplateTemplateArgument;
1024    }
1025
1026    // Revert this tentative parse to parse a non-type template argument.
1027    TPA.Revert();
1028  }
1029
1030  // Parse a non-type template argument.
1031  SourceLocation Loc = Tok.getLocation();
1032  ExprResult ExprArg = ParseConstantExpression();
1033  if (ExprArg.isInvalid() || !ExprArg.get())
1034    return ParsedTemplateArgument();
1035
1036  return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1037                                ExprArg.release(), Loc);
1038}
1039
1040/// \brief Determine whether the current tokens can only be parsed as a
1041/// template argument list (starting with the '<') and never as a '<'
1042/// expression.
1043bool Parser::IsTemplateArgumentList(unsigned Skip) {
1044  struct AlwaysRevertAction : TentativeParsingAction {
1045    AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1046    ~AlwaysRevertAction() { Revert(); }
1047  } Tentative(*this);
1048
1049  while (Skip) {
1050    ConsumeToken();
1051    --Skip;
1052  }
1053
1054  // '<'
1055  if (!Tok.is(tok::less))
1056    return false;
1057  ConsumeToken();
1058
1059  // An empty template argument list.
1060  if (Tok.is(tok::greater))
1061    return true;
1062
1063  // See whether we have declaration specifiers, which indicate a type.
1064  while (isCXXDeclarationSpecifier() == TPResult::True())
1065    ConsumeToken();
1066
1067  // If we have a '>' or a ',' then this is a template argument list.
1068  return Tok.is(tok::greater) || Tok.is(tok::comma);
1069}
1070
1071/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1072/// (C++ [temp.names]). Returns true if there was an error.
1073///
1074///       template-argument-list: [C++ 14.2]
1075///         template-argument
1076///         template-argument-list ',' template-argument
1077bool
1078Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1079  while (true) {
1080    ParsedTemplateArgument Arg = ParseTemplateArgument();
1081    if (Tok.is(tok::ellipsis)) {
1082      SourceLocation EllipsisLoc  = ConsumeToken();
1083      Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1084    }
1085
1086    if (Arg.isInvalid()) {
1087      SkipUntil(tok::comma, tok::greater, true, true);
1088      return true;
1089    }
1090
1091    // Save this template argument.
1092    TemplateArgs.push_back(Arg);
1093
1094    // If the next token is a comma, consume it and keep reading
1095    // arguments.
1096    if (Tok.isNot(tok::comma)) break;
1097
1098    // Consume the comma.
1099    ConsumeToken();
1100  }
1101
1102  return false;
1103}
1104
1105/// \brief Parse a C++ explicit template instantiation
1106/// (C++ [temp.explicit]).
1107///
1108///       explicit-instantiation:
1109///         'extern' [opt] 'template' declaration
1110///
1111/// Note that the 'extern' is a GNU extension and C++0x feature.
1112Decl *Parser::ParseExplicitInstantiation(unsigned Context,
1113                                         SourceLocation ExternLoc,
1114                                         SourceLocation TemplateLoc,
1115                                         SourceLocation &DeclEnd,
1116                                         AccessSpecifier AS) {
1117  // This isn't really required here.
1118  ParsingDeclRAIIObject ParsingTemplateParams(*this);
1119
1120  return ParseSingleDeclarationAfterTemplate(Context,
1121                                             ParsedTemplateInfo(ExternLoc,
1122                                                                TemplateLoc),
1123                                             ParsingTemplateParams,
1124                                             DeclEnd, AS);
1125}
1126
1127SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1128  if (TemplateParams)
1129    return getTemplateParamsRange(TemplateParams->data(),
1130                                  TemplateParams->size());
1131
1132  SourceRange R(TemplateLoc);
1133  if (ExternLoc.isValid())
1134    R.setBegin(ExternLoc);
1135  return R;
1136}
1137
1138void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) {
1139  ((Parser*)P)->LateTemplateParser(FD);
1140}
1141
1142
1143void Parser::LateTemplateParser(const FunctionDecl *FD) {
1144  LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD];
1145  if (LPT) {
1146    ParseLateTemplatedFuncDef(*LPT);
1147    return;
1148  }
1149
1150  llvm_unreachable("Late templated function without associated lexed tokens");
1151}
1152
1153/// \brief Late parse a C++ function template in Microsoft mode.
1154void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) {
1155  if(!LMT.D)
1156     return;
1157
1158  // If this is a member template, introduce the template parameter scope.
1159  ParseScope TemplateScope(this, Scope::TemplateParamScope);
1160
1161  // Get the FunctionDecl.
1162  FunctionDecl *FD = 0;
1163  if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D))
1164    FD = FunTmpl->getTemplatedDecl();
1165  else
1166    FD = cast<FunctionDecl>(LMT.D);
1167
1168  // Reinject the template parameters.
1169  SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1170  DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD);
1171  if (Declarator && Declarator->getNumTemplateParameterLists() != 0) {
1172    Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator);
1173    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1174  } else {
1175    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1176
1177    // Get the list of DeclContext to reenter.
1178    SmallVector<DeclContext*, 4> DeclContextToReenter;
1179    DeclContext *DD = FD->getLexicalParent();
1180    while (DD && DD->isRecord()) {
1181      DeclContextToReenter.push_back(DD);
1182      DD = DD->getLexicalParent();
1183    }
1184
1185    // Reenter template scopes from outmost to innermost.
1186    SmallVector<DeclContext*, 4>::reverse_iterator II =
1187    DeclContextToReenter.rbegin();
1188    for (; II != DeclContextToReenter.rend(); ++II) {
1189      if (ClassTemplatePartialSpecializationDecl* MD =
1190                dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) {
1191       TemplateParamScopeStack.push_back(new ParseScope(this,
1192                                                   Scope::TemplateParamScope));
1193        Actions.ActOnReenterTemplateScope(getCurScope(), MD);
1194      } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) {
1195        TemplateParamScopeStack.push_back(new ParseScope(this,
1196                                                    Scope::TemplateParamScope,
1197                                       MD->getDescribedClassTemplate() != 0 ));
1198        Actions.ActOnReenterTemplateScope(getCurScope(),
1199                                          MD->getDescribedClassTemplate());
1200      }
1201    }
1202  }
1203  assert(!LMT.Toks.empty() && "Empty body!");
1204
1205  // Append the current token at the end of the new token stream so that it
1206  // doesn't get lost.
1207  LMT.Toks.push_back(Tok);
1208  PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false);
1209
1210  // Consume the previously pushed token.
1211  ConsumeAnyToken();
1212  assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try))
1213         && "Inline method not starting with '{', ':' or 'try'");
1214
1215  // Parse the method body. Function body parsing code is similar enough
1216  // to be re-used for method bodies as well.
1217  ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1218
1219  // Recreate the DeclContext.
1220  Sema::ContextRAII SavedContext(Actions, Actions.getContainingDC(FD));
1221
1222  if (FunctionTemplateDecl *FunctionTemplate
1223        = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D))
1224    Actions.ActOnStartOfFunctionDef(getCurScope(),
1225                                   FunctionTemplate->getTemplatedDecl());
1226  if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D))
1227    Actions.ActOnStartOfFunctionDef(getCurScope(), Function);
1228
1229
1230  if (Tok.is(tok::kw_try)) {
1231    ParseFunctionTryBlock(LMT.D, FnScope);
1232  } else {
1233    if (Tok.is(tok::colon))
1234      ParseConstructorInitializer(LMT.D);
1235    else
1236      Actions.ActOnDefaultCtorInitializers(LMT.D);
1237
1238    if (Tok.is(tok::l_brace)) {
1239      ParseFunctionStatementBody(LMT.D, FnScope);
1240      Actions.MarkAsLateParsedTemplate(FD, false);
1241    } else
1242      Actions.ActOnFinishFunctionBody(LMT.D, 0);
1243  }
1244
1245  // Exit scopes.
1246  FnScope.Exit();
1247  SmallVector<ParseScope*, 4>::reverse_iterator I =
1248   TemplateParamScopeStack.rbegin();
1249  for (; I != TemplateParamScopeStack.rend(); ++I)
1250    delete *I;
1251
1252  DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D);
1253  if (grp)
1254    Actions.getASTConsumer().HandleTopLevelDecl(grp.get());
1255}
1256
1257/// \brief Lex a delayed template function for late parsing.
1258void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1259  tok::TokenKind kind = Tok.getKind();
1260  if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1261    // Consume everything up to (and including) the matching right brace.
1262    ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1263  }
1264
1265  // If we're in a function-try-block, we need to store all the catch blocks.
1266  if (kind == tok::kw_try) {
1267    while (Tok.is(tok::kw_catch)) {
1268      ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1269      ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1270    }
1271  }
1272}
1273