ParseTemplate.cpp revision 6df6548e44a61c444bd85dccd0398cba047c79b1 
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  ObjCDeclContextSwitch ObjCDC(*this);
31
32  if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
33    return ParseExplicitInstantiation(SourceLocation(), ConsumeToken(),
34                                           DeclEnd);
35  }
36  return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS);
37}
38
39/// \brief RAII class that manages the template parameter depth.
40namespace {
41  class TemplateParameterDepthCounter {
42    unsigned &Depth;
43    unsigned AddedLevels;
44
45  public:
46    explicit TemplateParameterDepthCounter(unsigned &Depth)
47      : Depth(Depth), AddedLevels(0) { }
48
49    ~TemplateParameterDepthCounter() {
50      Depth -= AddedLevels;
51    }
52
53    void operator++() {
54      ++Depth;
55      ++AddedLevels;
56    }
57
58    operator unsigned() const { return Depth; }
59  };
60}
61
62/// \brief Parse a template declaration or an explicit specialization.
63///
64/// Template declarations include one or more template parameter lists
65/// and either the function or class template declaration. Explicit
66/// specializations contain one or more 'template < >' prefixes
67/// followed by a (possibly templated) declaration. Since the
68/// syntactic form of both features is nearly identical, we parse all
69/// of the template headers together and let semantic analysis sort
70/// the declarations from the explicit specializations.
71///
72///       template-declaration: [C++ temp]
73///         'export'[opt] 'template' '<' template-parameter-list '>' declaration
74///
75///       explicit-specialization: [ C++ temp.expl.spec]
76///         'template' '<' '>' declaration
77Decl *
78Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
79                                                 SourceLocation &DeclEnd,
80                                                 AccessSpecifier AS) {
81  assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
82         "Token does not start a template declaration.");
83
84  // Enter template-parameter scope.
85  ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
86
87  // Tell the action that names should be checked in the context of
88  // the declaration to come.
89  ParsingDeclRAIIObject ParsingTemplateParams(*this);
90
91  // Parse multiple levels of template headers within this template
92  // parameter scope, e.g.,
93  //
94  //   template<typename T>
95  //     template<typename U>
96  //       class A<T>::B { ... };
97  //
98  // We parse multiple levels non-recursively so that we can build a
99  // single data structure containing all of the template parameter
100  // lists to easily differentiate between the case above and:
101  //
102  //   template<typename T>
103  //   class A {
104  //     template<typename U> class B;
105  //   };
106  //
107  // In the first case, the action for declaring A<T>::B receives
108  // both template parameter lists. In the second case, the action for
109  // defining A<T>::B receives just the inner template parameter list
110  // (and retrieves the outer template parameter list from its
111  // context).
112  bool isSpecialization = true;
113  bool LastParamListWasEmpty = false;
114  TemplateParameterLists ParamLists;
115  TemplateParameterDepthCounter Depth(TemplateParameterDepth);
116  do {
117    // Consume the 'export', if any.
118    SourceLocation ExportLoc;
119    if (Tok.is(tok::kw_export)) {
120      ExportLoc = ConsumeToken();
121    }
122
123    // Consume the 'template', which should be here.
124    SourceLocation TemplateLoc;
125    if (Tok.is(tok::kw_template)) {
126      TemplateLoc = ConsumeToken();
127    } else {
128      Diag(Tok.getLocation(), diag::err_expected_template);
129      return 0;
130    }
131
132    // Parse the '<' template-parameter-list '>'
133    SourceLocation LAngleLoc, RAngleLoc;
134    SmallVector<Decl*, 4> TemplateParams;
135    if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc,
136                                RAngleLoc)) {
137      // Skip until the semi-colon or a }.
138      SkipUntil(tok::r_brace, true, true);
139      if (Tok.is(tok::semi))
140        ConsumeToken();
141      return 0;
142    }
143
144    ParamLists.push_back(
145      Actions.ActOnTemplateParameterList(Depth, ExportLoc,
146                                         TemplateLoc, LAngleLoc,
147                                         TemplateParams.data(),
148                                         TemplateParams.size(), RAngleLoc));
149
150    if (!TemplateParams.empty()) {
151      isSpecialization = false;
152      ++Depth;
153    } else {
154      LastParamListWasEmpty = true;
155    }
156  } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
157
158  // Parse the actual template declaration.
159  return ParseSingleDeclarationAfterTemplate(Context,
160                                             ParsedTemplateInfo(&ParamLists,
161                                                             isSpecialization,
162                                                         LastParamListWasEmpty),
163                                             ParsingTemplateParams,
164                                             DeclEnd, AS);
165}
166
167/// \brief Parse a single declaration that declares a template,
168/// template specialization, or explicit instantiation of a template.
169///
170/// \param TemplateParams if non-NULL, the template parameter lists
171/// that preceded this declaration. In this case, the declaration is a
172/// template declaration, out-of-line definition of a template, or an
173/// explicit template specialization. When NULL, the declaration is an
174/// explicit template instantiation.
175///
176/// \param TemplateLoc when TemplateParams is NULL, the location of
177/// the 'template' keyword that indicates that we have an explicit
178/// template instantiation.
179///
180/// \param DeclEnd will receive the source location of the last token
181/// within this declaration.
182///
183/// \param AS the access specifier associated with this
184/// declaration. Will be AS_none for namespace-scope declarations.
185///
186/// \returns the new declaration.
187Decl *
188Parser::ParseSingleDeclarationAfterTemplate(
189                                       unsigned Context,
190                                       const ParsedTemplateInfo &TemplateInfo,
191                                       ParsingDeclRAIIObject &DiagsFromTParams,
192                                       SourceLocation &DeclEnd,
193                                       AccessSpecifier AS) {
194  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
195         "Template information required");
196
197  if (Context == Declarator::MemberContext) {
198    // We are parsing a member template.
199    ParseCXXClassMemberDeclaration(AS, TemplateInfo, &DiagsFromTParams);
200    return 0;
201  }
202
203  ParsedAttributesWithRange prefixAttrs(AttrFactory);
204  MaybeParseCXX0XAttributes(prefixAttrs);
205
206  if (Tok.is(tok::kw_using))
207    return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
208                                            prefixAttrs);
209
210  // Parse the declaration specifiers, stealing the accumulated
211  // diagnostics from the template parameters.
212  ParsingDeclSpec DS(*this, &DiagsFromTParams);
213
214  DS.takeAttributesFrom(prefixAttrs);
215
216  ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
217                             getDeclSpecContextFromDeclaratorContext(Context));
218
219  if (Tok.is(tok::semi)) {
220    DeclEnd = ConsumeToken();
221    Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
222    DS.complete(Decl);
223    return Decl;
224  }
225
226  // Parse the declarator.
227  ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
228  ParseDeclarator(DeclaratorInfo);
229  // Error parsing the declarator?
230  if (!DeclaratorInfo.hasName()) {
231    // If so, skip until the semi-colon or a }.
232    SkipUntil(tok::r_brace, true, true);
233    if (Tok.is(tok::semi))
234      ConsumeToken();
235    return 0;
236  }
237
238  // If we have a declaration or declarator list, handle it.
239  if (isDeclarationAfterDeclarator()) {
240    // Parse this declaration.
241    Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
242                                                     TemplateInfo);
243
244    if (Tok.is(tok::comma)) {
245      Diag(Tok, diag::err_multiple_template_declarators)
246        << (int)TemplateInfo.Kind;
247      SkipUntil(tok::semi, true, false);
248      return ThisDecl;
249    }
250
251    // Eat the semi colon after the declaration.
252    ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration);
253    DeclaratorInfo.complete(ThisDecl);
254    return ThisDecl;
255  }
256
257  if (DeclaratorInfo.isFunctionDeclarator() &&
258      isStartOfFunctionDefinition(DeclaratorInfo)) {
259    if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
260      Diag(Tok, diag::err_function_declared_typedef);
261
262      if (Tok.is(tok::l_brace)) {
263        // This recovery skips the entire function body. It would be nice
264        // to simply call ParseFunctionDefinition() below, however Sema
265        // assumes the declarator represents a function, not a typedef.
266        ConsumeBrace();
267        SkipUntil(tok::r_brace, true);
268      } else {
269        SkipUntil(tok::semi);
270      }
271      return 0;
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    if (!getLang().CPlusPlus0x)
474      Diag(EllipsisLoc, diag::ext_variadic_templates);
475  }
476
477  // Grab the template parameter name (if given)
478  SourceLocation NameLoc;
479  IdentifierInfo* ParamName = 0;
480  if (Tok.is(tok::identifier)) {
481    ParamName = Tok.getIdentifierInfo();
482    NameLoc = ConsumeToken();
483  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
484            Tok.is(tok::greater)) {
485    // Unnamed template parameter. Don't have to do anything here, just
486    // don't consume this token.
487  } else {
488    Diag(Tok.getLocation(), diag::err_expected_ident);
489    return 0;
490  }
491
492  // Grab a default argument (if available).
493  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
494  // we introduce the type parameter into the local scope.
495  SourceLocation EqualLoc;
496  ParsedType DefaultArg;
497  if (Tok.is(tok::equal)) {
498    EqualLoc = ConsumeToken();
499    DefaultArg = ParseTypeName().get();
500  }
501
502  return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis,
503                                    EllipsisLoc, KeyLoc, ParamName, NameLoc,
504                                    Depth, Position, EqualLoc, DefaultArg);
505}
506
507/// ParseTemplateTemplateParameter - Handle the parsing of template
508/// template parameters.
509///
510///       type-parameter:    [C++ temp.param]
511///         'template' '<' template-parameter-list '>' 'class'
512///                  ...[opt] identifier[opt]
513///         'template' '<' template-parameter-list '>' 'class' identifier[opt]
514///                  = id-expression
515Decl *
516Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
517  assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
518
519  // Handle the template <...> part.
520  SourceLocation TemplateLoc = ConsumeToken();
521  SmallVector<Decl*,8> TemplateParams;
522  SourceLocation LAngleLoc, RAngleLoc;
523  {
524    ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
525    if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
526                               RAngleLoc)) {
527      return 0;
528    }
529  }
530
531  // Generate a meaningful error if the user forgot to put class before the
532  // identifier, comma, or greater.
533  if (!Tok.is(tok::kw_class)) {
534    Diag(Tok.getLocation(), diag::err_expected_class_before)
535      << PP.getSpelling(Tok);
536    return 0;
537  }
538  ConsumeToken();
539
540  // Parse the ellipsis, if given.
541  SourceLocation EllipsisLoc;
542  if (Tok.is(tok::ellipsis)) {
543    EllipsisLoc = ConsumeToken();
544
545    if (!getLang().CPlusPlus0x)
546      Diag(EllipsisLoc, diag::ext_variadic_templates);
547  }
548
549  // Get the identifier, if given.
550  SourceLocation NameLoc;
551  IdentifierInfo* ParamName = 0;
552  if (Tok.is(tok::identifier)) {
553    ParamName = Tok.getIdentifierInfo();
554    NameLoc = ConsumeToken();
555  } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) {
556    // Unnamed template parameter. Don't have to do anything here, just
557    // don't consume this token.
558  } else {
559    Diag(Tok.getLocation(), diag::err_expected_ident);
560    return 0;
561  }
562
563  TemplateParameterList *ParamList =
564    Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
565                                       TemplateLoc, LAngleLoc,
566                                       TemplateParams.data(),
567                                       TemplateParams.size(),
568                                       RAngleLoc);
569
570  // Grab a default argument (if available).
571  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
572  // we introduce the template parameter into the local scope.
573  SourceLocation EqualLoc;
574  ParsedTemplateArgument DefaultArg;
575  if (Tok.is(tok::equal)) {
576    EqualLoc = ConsumeToken();
577    DefaultArg = ParseTemplateTemplateArgument();
578    if (DefaultArg.isInvalid()) {
579      Diag(Tok.getLocation(),
580           diag::err_default_template_template_parameter_not_template);
581      static const tok::TokenKind EndToks[] = {
582        tok::comma, tok::greater, tok::greatergreater
583      };
584      SkipUntil(EndToks, 3, true, true);
585    }
586  }
587
588  return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
589                                                ParamList, EllipsisLoc,
590                                                ParamName, NameLoc, Depth,
591                                                Position, EqualLoc, DefaultArg);
592}
593
594/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
595/// template parameters (e.g., in "template<int Size> class array;").
596///
597///       template-parameter:
598///         ...
599///         parameter-declaration
600Decl *
601Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
602  // Parse the declaration-specifiers (i.e., the type).
603  // FIXME: The type should probably be restricted in some way... Not all
604  // declarators (parts of declarators?) are accepted for parameters.
605  DeclSpec DS(AttrFactory);
606  ParseDeclarationSpecifiers(DS);
607
608  // Parse this as a typename.
609  Declarator ParamDecl(DS, Declarator::TemplateParamContext);
610  ParseDeclarator(ParamDecl);
611  if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
612    // This probably shouldn't happen - and it's more of a Sema thing, but
613    // basically we didn't parse the type name because we couldn't associate
614    // it with an AST node. we should just skip to the comma or greater.
615    // TODO: This is currently a placeholder for some kind of Sema Error.
616    Diag(Tok.getLocation(), diag::err_parse_error);
617    SkipUntil(tok::comma, tok::greater, true, true);
618    return 0;
619  }
620
621  // If there is a default value, parse it.
622  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
623  // we introduce the template parameter into the local scope.
624  SourceLocation EqualLoc;
625  ExprResult DefaultArg;
626  if (Tok.is(tok::equal)) {
627    EqualLoc = ConsumeToken();
628
629    // C++ [temp.param]p15:
630    //   When parsing a default template-argument for a non-type
631    //   template-parameter, the first non-nested > is taken as the
632    //   end of the template-parameter-list rather than a greater-than
633    //   operator.
634    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
635
636    DefaultArg = ParseAssignmentExpression();
637    if (DefaultArg.isInvalid())
638      SkipUntil(tok::comma, tok::greater, true, true);
639  }
640
641  // Create the parameter.
642  return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
643                                               Depth, Position, EqualLoc,
644                                               DefaultArg.take());
645}
646
647/// \brief Parses a template-id that after the template name has
648/// already been parsed.
649///
650/// This routine takes care of parsing the enclosed template argument
651/// list ('<' template-parameter-list [opt] '>') and placing the
652/// results into a form that can be transferred to semantic analysis.
653///
654/// \param Template the template declaration produced by isTemplateName
655///
656/// \param TemplateNameLoc the source location of the template name
657///
658/// \param SS if non-NULL, the nested-name-specifier preceding the
659/// template name.
660///
661/// \param ConsumeLastToken if true, then we will consume the last
662/// token that forms the template-id. Otherwise, we will leave the
663/// last token in the stream (e.g., so that it can be replaced with an
664/// annotation token).
665bool
666Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
667                                         SourceLocation TemplateNameLoc,
668                                         const CXXScopeSpec &SS,
669                                         bool ConsumeLastToken,
670                                         SourceLocation &LAngleLoc,
671                                         TemplateArgList &TemplateArgs,
672                                         SourceLocation &RAngleLoc) {
673  assert(Tok.is(tok::less) && "Must have already parsed the template-name");
674
675  // Consume the '<'.
676  LAngleLoc = ConsumeToken();
677
678  // Parse the optional template-argument-list.
679  bool Invalid = false;
680  {
681    GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
682    if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
683      Invalid = ParseTemplateArgumentList(TemplateArgs);
684
685    if (Invalid) {
686      // Try to find the closing '>'.
687      SkipUntil(tok::greater, true, !ConsumeLastToken);
688
689      return true;
690    }
691  }
692
693  if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) {
694    Diag(Tok.getLocation(), diag::err_expected_greater);
695    return true;
696  }
697
698  // Determine the location of the '>' or '>>'. Only consume this
699  // token if the caller asked us to.
700  RAngleLoc = Tok.getLocation();
701
702  if (Tok.is(tok::greatergreater)) {
703    if (!getLang().CPlusPlus0x) {
704      const char *ReplaceStr = "> >";
705      if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
706        ReplaceStr = "> > ";
707
708      Diag(Tok.getLocation(), diag::err_two_right_angle_brackets_need_space)
709        << FixItHint::CreateReplacement(
710                                 SourceRange(Tok.getLocation()), ReplaceStr);
711    }
712
713    Tok.setKind(tok::greater);
714    if (!ConsumeLastToken) {
715      // Since we're not supposed to consume the '>>' token, we need
716      // to insert a second '>' token after the first.
717      PP.EnterToken(Tok);
718    }
719  } else if (ConsumeLastToken)
720    ConsumeToken();
721
722  return false;
723}
724
725/// \brief Replace the tokens that form a simple-template-id with an
726/// annotation token containing the complete template-id.
727///
728/// The first token in the stream must be the name of a template that
729/// is followed by a '<'. This routine will parse the complete
730/// simple-template-id and replace the tokens with a single annotation
731/// token with one of two different kinds: if the template-id names a
732/// type (and \p AllowTypeAnnotation is true), the annotation token is
733/// a type annotation that includes the optional nested-name-specifier
734/// (\p SS). Otherwise, the annotation token is a template-id
735/// annotation that does not include the optional
736/// nested-name-specifier.
737///
738/// \param Template  the declaration of the template named by the first
739/// token (an identifier), as returned from \c Action::isTemplateName().
740///
741/// \param TemplateNameKind the kind of template that \p Template
742/// refers to, as returned from \c Action::isTemplateName().
743///
744/// \param SS if non-NULL, the nested-name-specifier that precedes
745/// this template name.
746///
747/// \param TemplateKWLoc if valid, specifies that this template-id
748/// annotation was preceded by the 'template' keyword and gives the
749/// location of that keyword. If invalid (the default), then this
750/// template-id was not preceded by a 'template' keyword.
751///
752/// \param AllowTypeAnnotation if true (the default), then a
753/// simple-template-id that refers to a class template, template
754/// template parameter, or other template that produces a type will be
755/// replaced with a type annotation token. Otherwise, the
756/// simple-template-id is always replaced with a template-id
757/// annotation token.
758///
759/// If an unrecoverable parse error occurs and no annotation token can be
760/// formed, this function returns true.
761///
762bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
763                                     CXXScopeSpec &SS,
764                                     UnqualifiedId &TemplateName,
765                                     SourceLocation TemplateKWLoc,
766                                     bool AllowTypeAnnotation) {
767  assert(getLang().CPlusPlus && "Can only annotate template-ids in C++");
768  assert(Template && Tok.is(tok::less) &&
769         "Parser isn't at the beginning of a template-id");
770
771  // Consume the template-name.
772  SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
773
774  // Parse the enclosed template argument list.
775  SourceLocation LAngleLoc, RAngleLoc;
776  TemplateArgList TemplateArgs;
777  bool Invalid = ParseTemplateIdAfterTemplateName(Template,
778                                                  TemplateNameLoc,
779                                                  SS, false, LAngleLoc,
780                                                  TemplateArgs,
781                                                  RAngleLoc);
782
783  if (Invalid) {
784    // If we failed to parse the template ID but skipped ahead to a >, we're not
785    // going to be able to form a token annotation.  Eat the '>' if present.
786    if (Tok.is(tok::greater))
787      ConsumeToken();
788    return true;
789  }
790
791  ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
792                                     TemplateArgs.size());
793
794  // Build the annotation token.
795  if (TNK == TNK_Type_template && AllowTypeAnnotation) {
796    TypeResult Type
797      = Actions.ActOnTemplateIdType(SS,
798                                    Template, TemplateNameLoc,
799                                    LAngleLoc, TemplateArgsPtr,
800                                    RAngleLoc);
801    if (Type.isInvalid()) {
802      // If we failed to parse the template ID but skipped ahead to a >, we're not
803      // going to be able to form a token annotation.  Eat the '>' if present.
804      if (Tok.is(tok::greater))
805        ConsumeToken();
806      return true;
807    }
808
809    Tok.setKind(tok::annot_typename);
810    setTypeAnnotation(Tok, Type.get());
811    if (SS.isNotEmpty())
812      Tok.setLocation(SS.getBeginLoc());
813    else if (TemplateKWLoc.isValid())
814      Tok.setLocation(TemplateKWLoc);
815    else
816      Tok.setLocation(TemplateNameLoc);
817  } else {
818    // Build a template-id annotation token that can be processed
819    // later.
820    Tok.setKind(tok::annot_template_id);
821    TemplateIdAnnotation *TemplateId
822      = TemplateIdAnnotation::Allocate(TemplateArgs.size());
823    TemplateId->TemplateNameLoc = TemplateNameLoc;
824    if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
825      TemplateId->Name = TemplateName.Identifier;
826      TemplateId->Operator = OO_None;
827    } else {
828      TemplateId->Name = 0;
829      TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
830    }
831    TemplateId->SS = SS;
832    TemplateId->Template = Template;
833    TemplateId->Kind = TNK;
834    TemplateId->LAngleLoc = LAngleLoc;
835    TemplateId->RAngleLoc = RAngleLoc;
836    ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
837    for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
838      Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]);
839    Tok.setAnnotationValue(TemplateId);
840    if (TemplateKWLoc.isValid())
841      Tok.setLocation(TemplateKWLoc);
842    else
843      Tok.setLocation(TemplateNameLoc);
844
845    TemplateArgsPtr.release();
846  }
847
848  // Common fields for the annotation token
849  Tok.setAnnotationEndLoc(RAngleLoc);
850
851  // In case the tokens were cached, have Preprocessor replace them with the
852  // annotation token.
853  PP.AnnotateCachedTokens(Tok);
854  return false;
855}
856
857/// \brief Replaces a template-id annotation token with a type
858/// annotation token.
859///
860/// If there was a failure when forming the type from the template-id,
861/// a type annotation token will still be created, but will have a
862/// NULL type pointer to signify an error.
863void Parser::AnnotateTemplateIdTokenAsType() {
864  assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
865
866  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
867  assert((TemplateId->Kind == TNK_Type_template ||
868          TemplateId->Kind == TNK_Dependent_template_name) &&
869         "Only works for type and dependent templates");
870
871  ASTTemplateArgsPtr TemplateArgsPtr(Actions,
872                                     TemplateId->getTemplateArgs(),
873                                     TemplateId->NumArgs);
874
875  TypeResult Type
876    = Actions.ActOnTemplateIdType(TemplateId->SS,
877                                  TemplateId->Template,
878                                  TemplateId->TemplateNameLoc,
879                                  TemplateId->LAngleLoc,
880                                  TemplateArgsPtr,
881                                  TemplateId->RAngleLoc);
882  // Create the new "type" annotation token.
883  Tok.setKind(tok::annot_typename);
884  setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
885  if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
886    Tok.setLocation(TemplateId->SS.getBeginLoc());
887  // End location stays the same
888
889  // Replace the template-id annotation token, and possible the scope-specifier
890  // that precedes it, with the typename annotation token.
891  PP.AnnotateCachedTokens(Tok);
892}
893
894/// \brief Determine whether the given token can end a template argument.
895static bool isEndOfTemplateArgument(Token Tok) {
896  return Tok.is(tok::comma) || Tok.is(tok::greater) ||
897         Tok.is(tok::greatergreater);
898}
899
900/// \brief Parse a C++ template template argument.
901ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
902  if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
903      !Tok.is(tok::annot_cxxscope))
904    return ParsedTemplateArgument();
905
906  // C++0x [temp.arg.template]p1:
907  //   A template-argument for a template template-parameter shall be the name
908  //   of a class template or an alias template, expressed as id-expression.
909  //
910  // We parse an id-expression that refers to a class template or alias
911  // template. The grammar we parse is:
912  //
913  //   nested-name-specifier[opt] template[opt] identifier ...[opt]
914  //
915  // followed by a token that terminates a template argument, such as ',',
916  // '>', or (in some cases) '>>'.
917  CXXScopeSpec SS; // nested-name-specifier, if present
918  ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
919                                 /*EnteringContext=*/false);
920
921  ParsedTemplateArgument Result;
922  SourceLocation EllipsisLoc;
923  if (SS.isSet() && Tok.is(tok::kw_template)) {
924    // Parse the optional 'template' keyword following the
925    // nested-name-specifier.
926    SourceLocation TemplateLoc = ConsumeToken();
927
928    if (Tok.is(tok::identifier)) {
929      // We appear to have a dependent template name.
930      UnqualifiedId Name;
931      Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
932      ConsumeToken(); // the identifier
933
934      // Parse the ellipsis.
935      if (Tok.is(tok::ellipsis))
936        EllipsisLoc = ConsumeToken();
937
938      // If the next token signals the end of a template argument,
939      // then we have a dependent template name that could be a template
940      // template argument.
941      TemplateTy Template;
942      if (isEndOfTemplateArgument(Tok) &&
943          Actions.ActOnDependentTemplateName(getCurScope(), TemplateLoc,
944                                             SS, Name,
945                                             /*ObjectType=*/ ParsedType(),
946                                             /*EnteringContext=*/false,
947                                             Template))
948        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
949    }
950  } else if (Tok.is(tok::identifier)) {
951    // We may have a (non-dependent) template name.
952    TemplateTy Template;
953    UnqualifiedId Name;
954    Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
955    ConsumeToken(); // the identifier
956
957    // Parse the ellipsis.
958    if (Tok.is(tok::ellipsis))
959      EllipsisLoc = ConsumeToken();
960
961    if (isEndOfTemplateArgument(Tok)) {
962      bool MemberOfUnknownSpecialization;
963      TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
964                                               /*hasTemplateKeyword=*/false,
965                                                    Name,
966                                               /*ObjectType=*/ ParsedType(),
967                                                    /*EnteringContext=*/false,
968                                                    Template,
969                                                MemberOfUnknownSpecialization);
970      if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
971        // We have an id-expression that refers to a class template or
972        // (C++0x) alias template.
973        Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
974      }
975    }
976  }
977
978  // If this is a pack expansion, build it as such.
979  if (EllipsisLoc.isValid() && !Result.isInvalid())
980    Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
981
982  return Result;
983}
984
985/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
986///
987///       template-argument: [C++ 14.2]
988///         constant-expression
989///         type-id
990///         id-expression
991ParsedTemplateArgument Parser::ParseTemplateArgument() {
992  // C++ [temp.arg]p2:
993  //   In a template-argument, an ambiguity between a type-id and an
994  //   expression is resolved to a type-id, regardless of the form of
995  //   the corresponding template-parameter.
996  //
997  // Therefore, we initially try to parse a type-id.
998  if (isCXXTypeId(TypeIdAsTemplateArgument)) {
999    SourceLocation Loc = Tok.getLocation();
1000    TypeResult TypeArg = ParseTypeName(/*Range=*/0,
1001                                       Declarator::TemplateTypeArgContext);
1002    if (TypeArg.isInvalid())
1003      return ParsedTemplateArgument();
1004
1005    return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1006                                  TypeArg.get().getAsOpaquePtr(),
1007                                  Loc);
1008  }
1009
1010  // Try to parse a template template argument.
1011  {
1012    TentativeParsingAction TPA(*this);
1013
1014    ParsedTemplateArgument TemplateTemplateArgument
1015      = ParseTemplateTemplateArgument();
1016    if (!TemplateTemplateArgument.isInvalid()) {
1017      TPA.Commit();
1018      return TemplateTemplateArgument;
1019    }
1020
1021    // Revert this tentative parse to parse a non-type template argument.
1022    TPA.Revert();
1023  }
1024
1025  // Parse a non-type template argument.
1026  SourceLocation Loc = Tok.getLocation();
1027  ExprResult ExprArg = ParseConstantExpression();
1028  if (ExprArg.isInvalid() || !ExprArg.get())
1029    return ParsedTemplateArgument();
1030
1031  return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1032                                ExprArg.release(), Loc);
1033}
1034
1035/// \brief Determine whether the current tokens can only be parsed as a
1036/// template argument list (starting with the '<') and never as a '<'
1037/// expression.
1038bool Parser::IsTemplateArgumentList(unsigned Skip) {
1039  struct AlwaysRevertAction : TentativeParsingAction {
1040    AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1041    ~AlwaysRevertAction() { Revert(); }
1042  } Tentative(*this);
1043
1044  while (Skip) {
1045    ConsumeToken();
1046    --Skip;
1047  }
1048
1049  // '<'
1050  if (!Tok.is(tok::less))
1051    return false;
1052  ConsumeToken();
1053
1054  // An empty template argument list.
1055  if (Tok.is(tok::greater))
1056    return true;
1057
1058  // See whether we have declaration specifiers, which indicate a type.
1059  while (isCXXDeclarationSpecifier() == TPResult::True())
1060    ConsumeToken();
1061
1062  // If we have a '>' or a ',' then this is a template argument list.
1063  return Tok.is(tok::greater) || Tok.is(tok::comma);
1064}
1065
1066/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1067/// (C++ [temp.names]). Returns true if there was an error.
1068///
1069///       template-argument-list: [C++ 14.2]
1070///         template-argument
1071///         template-argument-list ',' template-argument
1072bool
1073Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1074  while (true) {
1075    ParsedTemplateArgument Arg = ParseTemplateArgument();
1076    if (Tok.is(tok::ellipsis)) {
1077      SourceLocation EllipsisLoc  = ConsumeToken();
1078      Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1079    }
1080
1081    if (Arg.isInvalid()) {
1082      SkipUntil(tok::comma, tok::greater, true, true);
1083      return true;
1084    }
1085
1086    // Save this template argument.
1087    TemplateArgs.push_back(Arg);
1088
1089    // If the next token is a comma, consume it and keep reading
1090    // arguments.
1091    if (Tok.isNot(tok::comma)) break;
1092
1093    // Consume the comma.
1094    ConsumeToken();
1095  }
1096
1097  return false;
1098}
1099
1100/// \brief Parse a C++ explicit template instantiation
1101/// (C++ [temp.explicit]).
1102///
1103///       explicit-instantiation:
1104///         'extern' [opt] 'template' declaration
1105///
1106/// Note that the 'extern' is a GNU extension and C++0x feature.
1107Decl *Parser::ParseExplicitInstantiation(SourceLocation ExternLoc,
1108                                         SourceLocation TemplateLoc,
1109                                         SourceLocation &DeclEnd) {
1110  // This isn't really required here.
1111  ParsingDeclRAIIObject ParsingTemplateParams(*this);
1112
1113  return ParseSingleDeclarationAfterTemplate(Declarator::FileContext,
1114                                             ParsedTemplateInfo(ExternLoc,
1115                                                                TemplateLoc),
1116                                             ParsingTemplateParams,
1117                                             DeclEnd, AS_none);
1118}
1119
1120SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1121  if (TemplateParams)
1122    return getTemplateParamsRange(TemplateParams->data(),
1123                                  TemplateParams->size());
1124
1125  SourceRange R(TemplateLoc);
1126  if (ExternLoc.isValid())
1127    R.setBegin(ExternLoc);
1128  return R;
1129}
1130
1131void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) {
1132  ((Parser*)P)->LateTemplateParser(FD);
1133}
1134
1135
1136void Parser::LateTemplateParser(const FunctionDecl *FD) {
1137  LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD];
1138  if (LPT) {
1139    ParseLateTemplatedFuncDef(*LPT);
1140    return;
1141  }
1142
1143  llvm_unreachable("Late templated function without associated lexed tokens");
1144}
1145
1146/// \brief Late parse a C++ function template in Microsoft mode.
1147void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) {
1148  if(!LMT.D)
1149     return;
1150
1151  // If this is a member template, introduce the template parameter scope.
1152  ParseScope TemplateScope(this, Scope::TemplateParamScope);
1153
1154  // Get the FunctionDecl.
1155  FunctionDecl *FD = 0;
1156  if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D))
1157    FD = FunTmpl->getTemplatedDecl();
1158  else
1159    FD = cast<FunctionDecl>(LMT.D);
1160
1161  // Reinject the template parameters.
1162  SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1163  DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD);
1164  if (Declarator && Declarator->getNumTemplateParameterLists() != 0) {
1165    Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator);
1166    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1167  } else {
1168    Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D);
1169
1170    // Get the list of DeclContext to reenter.
1171    SmallVector<DeclContext*, 4> DeclContextToReenter;
1172    DeclContext *DD = FD->getLexicalParent();
1173    while (DD && DD->isRecord()) {
1174      DeclContextToReenter.push_back(DD);
1175      DD = DD->getLexicalParent();
1176    }
1177
1178    // Reenter template scopes from outmost to innermost.
1179    SmallVector<DeclContext*, 4>::reverse_iterator II =
1180    DeclContextToReenter.rbegin();
1181    for (; II != DeclContextToReenter.rend(); ++II) {
1182      if (ClassTemplatePartialSpecializationDecl* MD =
1183                dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) {
1184       TemplateParamScopeStack.push_back(new ParseScope(this,
1185                                                   Scope::TemplateParamScope));
1186        Actions.ActOnReenterTemplateScope(getCurScope(), MD);
1187      } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) {
1188        TemplateParamScopeStack.push_back(new ParseScope(this,
1189                                                    Scope::TemplateParamScope,
1190                                       MD->getDescribedClassTemplate() != 0 ));
1191        Actions.ActOnReenterTemplateScope(getCurScope(),
1192                                          MD->getDescribedClassTemplate());
1193      }
1194    }
1195  }
1196  assert(!LMT.Toks.empty() && "Empty body!");
1197
1198  // Append the current token at the end of the new token stream so that it
1199  // doesn't get lost.
1200  LMT.Toks.push_back(Tok);
1201  PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false);
1202
1203  // Consume the previously pushed token.
1204  ConsumeAnyToken();
1205  assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try))
1206         && "Inline method not starting with '{', ':' or 'try'");
1207
1208  // Parse the method body. Function body parsing code is similar enough
1209  // to be re-used for method bodies as well.
1210  ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1211
1212  // Recreate the DeclContext.
1213  Sema::ContextRAII SavedContext(Actions, Actions.getContainingDC(FD));
1214
1215  if (FunctionTemplateDecl *FunctionTemplate
1216        = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D))
1217    Actions.ActOnStartOfFunctionDef(getCurScope(),
1218                                   FunctionTemplate->getTemplatedDecl());
1219  if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D))
1220    Actions.ActOnStartOfFunctionDef(getCurScope(), Function);
1221
1222
1223  if (Tok.is(tok::kw_try)) {
1224    ParseFunctionTryBlock(LMT.D, FnScope);
1225  } else {
1226    if (Tok.is(tok::colon))
1227      ParseConstructorInitializer(LMT.D);
1228    else
1229      Actions.ActOnDefaultCtorInitializers(LMT.D);
1230
1231    if (Tok.is(tok::l_brace)) {
1232      ParseFunctionStatementBody(LMT.D, FnScope);
1233      Actions.MarkAsLateParsedTemplate(FD, false);
1234    } else
1235      Actions.ActOnFinishFunctionBody(LMT.D, 0);
1236  }
1237
1238  // Exit scopes.
1239  FnScope.Exit();
1240  SmallVector<ParseScope*, 4>::reverse_iterator I =
1241   TemplateParamScopeStack.rbegin();
1242  for (; I != TemplateParamScopeStack.rend(); ++I)
1243    delete *I;
1244
1245  DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D);
1246  if (grp)
1247    Actions.getASTConsumer().HandleTopLevelDecl(grp.get());
1248}
1249
1250/// \brief Lex a delayed template function for late parsing.
1251void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1252  tok::TokenKind kind = Tok.getKind();
1253  // We may have a constructor initializer or function-try-block here.
1254  if (kind == tok::colon || kind == tok::kw_try)
1255    ConsumeAndStoreTryAndInitializers(Toks);
1256  else {
1257    Toks.push_back(Tok);
1258    ConsumeBrace();
1259  }
1260  // Consume everything up to (and including) the matching right brace.
1261  ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1262
1263  // If we're in a function-try-block, we need to store all the catch blocks.
1264  if (kind == tok::kw_try) {
1265    while (Tok.is(tok::kw_catch)) {
1266      ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1267      ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1268    }
1269  }
1270}
1271