clang  7.0.0svn
ParseTemplate.cpp
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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/AST/ASTContext.h"
15 #include "clang/AST/DeclTemplate.h"
17 #include "clang/Parse/Parser.h"
19 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/Scope.h"
22 using namespace clang;
23 
24 /// Parse a template declaration, explicit instantiation, or
25 /// explicit specialization.
26 Decl *Parser::ParseDeclarationStartingWithTemplate(
27  DeclaratorContext Context, SourceLocation &DeclEnd,
28  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
29  ObjCDeclContextSwitch ObjCDC(*this);
30 
31  if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
32  return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
33  DeclEnd, AccessAttrs, AS);
34  }
35  return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
36  AS);
37 }
38 
39 /// Parse a template declaration or an explicit specialization.
40 ///
41 /// Template declarations include one or more template parameter lists
42 /// and either the function or class template declaration. Explicit
43 /// specializations contain one or more 'template < >' prefixes
44 /// followed by a (possibly templated) declaration. Since the
45 /// syntactic form of both features is nearly identical, we parse all
46 /// of the template headers together and let semantic analysis sort
47 /// the declarations from the explicit specializations.
48 ///
49 /// template-declaration: [C++ temp]
50 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
51 ///
52 /// explicit-specialization: [ C++ temp.expl.spec]
53 /// 'template' '<' '>' declaration
54 Decl *Parser::ParseTemplateDeclarationOrSpecialization(
55  DeclaratorContext Context, SourceLocation &DeclEnd,
56  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
57  assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
58  "Token does not start a template declaration.");
59 
60  // Enter template-parameter scope.
61  ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
62 
63  // Tell the action that names should be checked in the context of
64  // the declaration to come.
66  ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
67 
68  // Parse multiple levels of template headers within this template
69  // parameter scope, e.g.,
70  //
71  // template<typename T>
72  // template<typename U>
73  // class A<T>::B { ... };
74  //
75  // We parse multiple levels non-recursively so that we can build a
76  // single data structure containing all of the template parameter
77  // lists to easily differentiate between the case above and:
78  //
79  // template<typename T>
80  // class A {
81  // template<typename U> class B;
82  // };
83  //
84  // In the first case, the action for declaring A<T>::B receives
85  // both template parameter lists. In the second case, the action for
86  // defining A<T>::B receives just the inner template parameter list
87  // (and retrieves the outer template parameter list from its
88  // context).
89  bool isSpecialization = true;
90  bool LastParamListWasEmpty = false;
91  TemplateParameterLists ParamLists;
92  TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
93 
94  do {
95  // Consume the 'export', if any.
96  SourceLocation ExportLoc;
97  TryConsumeToken(tok::kw_export, ExportLoc);
98 
99  // Consume the 'template', which should be here.
100  SourceLocation TemplateLoc;
101  if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
102  Diag(Tok.getLocation(), diag::err_expected_template);
103  return nullptr;
104  }
105 
106  // Parse the '<' template-parameter-list '>'
107  SourceLocation LAngleLoc, RAngleLoc;
108  SmallVector<NamedDecl*, 4> TemplateParams;
109  if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
110  TemplateParams, LAngleLoc, RAngleLoc)) {
111  // Skip until the semi-colon or a '}'.
112  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
113  TryConsumeToken(tok::semi);
114  return nullptr;
115  }
116 
117  ExprResult OptionalRequiresClauseConstraintER;
118  if (!TemplateParams.empty()) {
119  isSpecialization = false;
120  ++CurTemplateDepthTracker;
121 
122  if (TryConsumeToken(tok::kw_requires)) {
123  OptionalRequiresClauseConstraintER =
125  if (!OptionalRequiresClauseConstraintER.isUsable()) {
126  // Skip until the semi-colon or a '}'.
127  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
128  TryConsumeToken(tok::semi);
129  return nullptr;
130  }
131  }
132  } else {
133  LastParamListWasEmpty = true;
134  }
135 
136  ParamLists.push_back(Actions.ActOnTemplateParameterList(
137  CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
138  TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
139  } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
140 
141  unsigned NewFlags = getCurScope()->getFlags() & ~Scope::TemplateParamScope;
142  ParseScopeFlags TemplateScopeFlags(this, NewFlags, isSpecialization);
143 
144  // Parse the actual template declaration.
145  return ParseSingleDeclarationAfterTemplate(
146  Context,
147  ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
148  ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
149 }
150 
151 /// Parse a single declaration that declares a template,
152 /// template specialization, or explicit instantiation of a template.
153 ///
154 /// \param DeclEnd will receive the source location of the last token
155 /// within this declaration.
156 ///
157 /// \param AS the access specifier associated with this
158 /// declaration. Will be AS_none for namespace-scope declarations.
159 ///
160 /// \returns the new declaration.
161 Decl *Parser::ParseSingleDeclarationAfterTemplate(
162  DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
163  ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
164  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
165  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
166  "Template information required");
167 
168  if (Tok.is(tok::kw_static_assert)) {
169  // A static_assert declaration may not be templated.
170  Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
171  << TemplateInfo.getSourceRange();
172  // Parse the static_assert declaration to improve error recovery.
173  return ParseStaticAssertDeclaration(DeclEnd);
174  }
175 
176  if (Context == DeclaratorContext::MemberContext) {
177  // We are parsing a member template.
178  ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
179  &DiagsFromTParams);
180  return nullptr;
181  }
182 
183  ParsedAttributesWithRange prefixAttrs(AttrFactory);
184  MaybeParseCXX11Attributes(prefixAttrs);
185 
186  if (Tok.is(tok::kw_using)) {
187  auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
188  prefixAttrs);
189  if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
190  return nullptr;
191  return usingDeclPtr.get().getSingleDecl();
192  }
193 
194  // Parse the declaration specifiers, stealing any diagnostics from
195  // the template parameters.
196  ParsingDeclSpec DS(*this, &DiagsFromTParams);
197 
198  ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
199  getDeclSpecContextFromDeclaratorContext(Context));
200 
201  if (Tok.is(tok::semi)) {
202  ProhibitAttributes(prefixAttrs);
203  DeclEnd = ConsumeToken();
204  RecordDecl *AnonRecord = nullptr;
206  getCurScope(), AS, DS,
207  TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
209  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
210  AnonRecord);
211  assert(!AnonRecord &&
212  "Anonymous unions/structs should not be valid with template");
213  DS.complete(Decl);
214  return Decl;
215  }
216 
217  // Move the attributes from the prefix into the DS.
218  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
219  ProhibitAttributes(prefixAttrs);
220  else
221  DS.takeAttributesFrom(prefixAttrs);
222 
223  // Parse the declarator.
224  ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
225  ParseDeclarator(DeclaratorInfo);
226  // Error parsing the declarator?
227  if (!DeclaratorInfo.hasName()) {
228  // If so, skip until the semi-colon or a }.
229  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
230  if (Tok.is(tok::semi))
231  ConsumeToken();
232  return nullptr;
233  }
234 
235  LateParsedAttrList LateParsedAttrs(true);
236  if (DeclaratorInfo.isFunctionDeclarator())
237  MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
238 
239  if (DeclaratorInfo.isFunctionDeclarator() &&
240  isStartOfFunctionDefinition(DeclaratorInfo)) {
241 
242  // Function definitions are only allowed at file scope and in C++ classes.
243  // The C++ inline method definition case is handled elsewhere, so we only
244  // need to handle the file scope definition case.
245  if (Context != DeclaratorContext::FileContext) {
246  Diag(Tok, diag::err_function_definition_not_allowed);
248  return nullptr;
249  }
250 
251  if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
252  // Recover by ignoring the 'typedef'. This was probably supposed to be
253  // the 'typename' keyword, which we should have already suggested adding
254  // if it's appropriate.
255  Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
256  << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
257  DS.ClearStorageClassSpecs();
258  }
259 
260  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
261  if (DeclaratorInfo.getName().getKind() !=
263  // If the declarator-id is not a template-id, issue a diagnostic and
264  // recover by ignoring the 'template' keyword.
265  Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
266  return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
267  &LateParsedAttrs);
268  } else {
269  SourceLocation LAngleLoc
270  = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
271  Diag(DeclaratorInfo.getIdentifierLoc(),
272  diag::err_explicit_instantiation_with_definition)
273  << SourceRange(TemplateInfo.TemplateLoc)
274  << FixItHint::CreateInsertion(LAngleLoc, "<>");
275 
276  // Recover as if it were an explicit specialization.
277  TemplateParameterLists FakedParamLists;
278  FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
279  0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
280  LAngleLoc, nullptr));
281 
282  return ParseFunctionDefinition(
283  DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
284  /*isSpecialization=*/true,
285  /*LastParamListWasEmpty=*/true),
286  &LateParsedAttrs);
287  }
288  }
289  return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
290  &LateParsedAttrs);
291  }
292 
293  // Parse this declaration.
294  Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
295  TemplateInfo);
296 
297  if (Tok.is(tok::comma)) {
298  Diag(Tok, diag::err_multiple_template_declarators)
299  << (int)TemplateInfo.Kind;
300  SkipUntil(tok::semi);
301  return ThisDecl;
302  }
303 
304  // Eat the semi colon after the declaration.
305  ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
306  if (LateParsedAttrs.size() > 0)
307  ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
308  DeclaratorInfo.complete(ThisDecl);
309  return ThisDecl;
310 }
311 
312 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
313 /// angle brackets. Depth is the depth of this template-parameter-list, which
314 /// is the number of template headers directly enclosing this template header.
315 /// TemplateParams is the current list of template parameters we're building.
316 /// The template parameter we parse will be added to this list. LAngleLoc and
317 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
318 /// that enclose this template parameter list.
319 ///
320 /// \returns true if an error occurred, false otherwise.
321 bool Parser::ParseTemplateParameters(
322  unsigned Depth, SmallVectorImpl<NamedDecl *> &TemplateParams,
323  SourceLocation &LAngleLoc, SourceLocation &RAngleLoc) {
324  // Get the template parameter list.
325  if (!TryConsumeToken(tok::less, LAngleLoc)) {
326  Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
327  return true;
328  }
329 
330  // Try to parse the template parameter list.
331  bool Failed = false;
332  if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
333  Failed = ParseTemplateParameterList(Depth, TemplateParams);
334 
335  if (Tok.is(tok::greatergreater)) {
336  // No diagnostic required here: a template-parameter-list can only be
337  // followed by a declaration or, for a template template parameter, the
338  // 'class' keyword. Therefore, the second '>' will be diagnosed later.
339  // This matters for elegant diagnosis of:
340  // template<template<typename>> struct S;
341  Tok.setKind(tok::greater);
342  RAngleLoc = Tok.getLocation();
344  } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
345  Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
346  return true;
347  }
348  return false;
349 }
350 
351 /// ParseTemplateParameterList - Parse a template parameter list. If
352 /// the parsing fails badly (i.e., closing bracket was left out), this
353 /// will try to put the token stream in a reasonable position (closing
354 /// a statement, etc.) and return false.
355 ///
356 /// template-parameter-list: [C++ temp]
357 /// template-parameter
358 /// template-parameter-list ',' template-parameter
359 bool
360 Parser::ParseTemplateParameterList(const unsigned Depth,
361  SmallVectorImpl<NamedDecl*> &TemplateParams) {
362  while (1) {
363 
364  if (NamedDecl *TmpParam
365  = ParseTemplateParameter(Depth, TemplateParams.size())) {
366  TemplateParams.push_back(TmpParam);
367  } else {
368  // If we failed to parse a template parameter, skip until we find
369  // a comma or closing brace.
370  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
372  }
373 
374  // Did we find a comma or the end of the template parameter list?
375  if (Tok.is(tok::comma)) {
376  ConsumeToken();
377  } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
378  // Don't consume this... that's done by template parser.
379  break;
380  } else {
381  // Somebody probably forgot to close the template. Skip ahead and
382  // try to get out of the expression. This error is currently
383  // subsumed by whatever goes on in ParseTemplateParameter.
384  Diag(Tok.getLocation(), diag::err_expected_comma_greater);
385  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
387  return false;
388  }
389  }
390  return true;
391 }
392 
393 /// Determine whether the parser is at the start of a template
394 /// type parameter.
395 bool Parser::isStartOfTemplateTypeParameter() {
396  if (Tok.is(tok::kw_class)) {
397  // "class" may be the start of an elaborated-type-specifier or a
398  // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
399  switch (NextToken().getKind()) {
400  case tok::equal:
401  case tok::comma:
402  case tok::greater:
403  case tok::greatergreater:
404  case tok::ellipsis:
405  return true;
406 
407  case tok::identifier:
408  // This may be either a type-parameter or an elaborated-type-specifier.
409  // We have to look further.
410  break;
411 
412  default:
413  return false;
414  }
415 
416  switch (GetLookAheadToken(2).getKind()) {
417  case tok::equal:
418  case tok::comma:
419  case tok::greater:
420  case tok::greatergreater:
421  return true;
422 
423  default:
424  return false;
425  }
426  }
427 
428  if (Tok.isNot(tok::kw_typename))
429  return false;
430 
431  // C++ [temp.param]p2:
432  // There is no semantic difference between class and typename in a
433  // template-parameter. typename followed by an unqualified-id
434  // names a template type parameter. typename followed by a
435  // qualified-id denotes the type in a non-type
436  // parameter-declaration.
437  Token Next = NextToken();
438 
439  // If we have an identifier, skip over it.
440  if (Next.getKind() == tok::identifier)
441  Next = GetLookAheadToken(2);
442 
443  switch (Next.getKind()) {
444  case tok::equal:
445  case tok::comma:
446  case tok::greater:
447  case tok::greatergreater:
448  case tok::ellipsis:
449  return true;
450 
451  default:
452  return false;
453  }
454 }
455 
456 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
457 ///
458 /// template-parameter: [C++ temp.param]
459 /// type-parameter
460 /// parameter-declaration
461 ///
462 /// type-parameter: (see below)
463 /// 'class' ...[opt] identifier[opt]
464 /// 'class' identifier[opt] '=' type-id
465 /// 'typename' ...[opt] identifier[opt]
466 /// 'typename' identifier[opt] '=' type-id
467 /// 'template' '<' template-parameter-list '>'
468 /// 'class' ...[opt] identifier[opt]
469 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
470 /// = id-expression
471 NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
472  if (isStartOfTemplateTypeParameter())
473  return ParseTypeParameter(Depth, Position);
474 
475  if (Tok.is(tok::kw_template))
476  return ParseTemplateTemplateParameter(Depth, Position);
477 
478  // Is there just a typo in the input code? ('typedef' instead of 'typename')
479  if (Tok.is(tok::kw_typedef)) {
480  Diag(Tok.getLocation(), diag::err_expected_template_parameter);
481 
482  Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
484  Tok.getLocation(), Tok.getEndLoc()),
485  "typename");
486 
487  Tok.setKind(tok::kw_typename);
488 
489  return ParseTypeParameter(Depth, Position);
490  }
491 
492  // If it's none of the above, then it must be a parameter declaration.
493  // NOTE: This will pick up errors in the closure of the template parameter
494  // list (e.g., template < ; Check here to implement >> style closures.
495  return ParseNonTypeTemplateParameter(Depth, Position);
496 }
497 
498 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
499 /// Other kinds of template parameters are parsed in
500 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
501 ///
502 /// type-parameter: [C++ temp.param]
503 /// 'class' ...[opt][C++0x] identifier[opt]
504 /// 'class' identifier[opt] '=' type-id
505 /// 'typename' ...[opt][C++0x] identifier[opt]
506 /// 'typename' identifier[opt] '=' type-id
507 NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
508  assert(Tok.isOneOf(tok::kw_class, tok::kw_typename) &&
509  "A type-parameter starts with 'class' or 'typename'");
510 
511  // Consume the 'class' or 'typename' keyword.
512  bool TypenameKeyword = Tok.is(tok::kw_typename);
513  SourceLocation KeyLoc = ConsumeToken();
514 
515  // Grab the ellipsis (if given).
516  SourceLocation EllipsisLoc;
517  if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
518  Diag(EllipsisLoc,
520  ? diag::warn_cxx98_compat_variadic_templates
521  : diag::ext_variadic_templates);
522  }
523 
524  // Grab the template parameter name (if given)
525  SourceLocation NameLoc;
526  IdentifierInfo *ParamName = nullptr;
527  if (Tok.is(tok::identifier)) {
528  ParamName = Tok.getIdentifierInfo();
529  NameLoc = ConsumeToken();
530  } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
531  tok::greatergreater)) {
532  // Unnamed template parameter. Don't have to do anything here, just
533  // don't consume this token.
534  } else {
535  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
536  return nullptr;
537  }
538 
539  // Recover from misplaced ellipsis.
540  bool AlreadyHasEllipsis = EllipsisLoc.isValid();
541  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
542  DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
543 
544  // Grab a default argument (if available).
545  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
546  // we introduce the type parameter into the local scope.
547  SourceLocation EqualLoc;
548  ParsedType DefaultArg;
549  if (TryConsumeToken(tok::equal, EqualLoc))
550  DefaultArg = ParseTypeName(/*Range=*/nullptr,
552 
553  return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
554  KeyLoc, ParamName, NameLoc, Depth, Position,
555  EqualLoc, DefaultArg);
556 }
557 
558 /// ParseTemplateTemplateParameter - Handle the parsing of template
559 /// template parameters.
560 ///
561 /// type-parameter: [C++ temp.param]
562 /// 'template' '<' template-parameter-list '>' type-parameter-key
563 /// ...[opt] identifier[opt]
564 /// 'template' '<' template-parameter-list '>' type-parameter-key
565 /// identifier[opt] = id-expression
566 /// type-parameter-key:
567 /// 'class'
568 /// 'typename' [C++1z]
569 NamedDecl *
570 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
571  assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
572 
573  // Handle the template <...> part.
574  SourceLocation TemplateLoc = ConsumeToken();
575  SmallVector<NamedDecl*,8> TemplateParams;
576  SourceLocation LAngleLoc, RAngleLoc;
577  {
578  ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
579  if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
580  RAngleLoc)) {
581  return nullptr;
582  }
583  }
584 
585  // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
586  // Generate a meaningful error if the user forgot to put class before the
587  // identifier, comma, or greater. Provide a fixit if the identifier, comma,
588  // or greater appear immediately or after 'struct'. In the latter case,
589  // replace the keyword with 'class'.
590  if (!TryConsumeToken(tok::kw_class)) {
591  bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
592  const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
593  if (Tok.is(tok::kw_typename)) {
594  Diag(Tok.getLocation(),
595  getLangOpts().CPlusPlus17
596  ? diag::warn_cxx14_compat_template_template_param_typename
597  : diag::ext_template_template_param_typename)
598  << (!getLangOpts().CPlusPlus17
599  ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
600  : FixItHint());
601  } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
602  tok::greatergreater, tok::ellipsis)) {
603  Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
604  << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
605  : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
606  } else
607  Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
608 
609  if (Replace)
610  ConsumeToken();
611  }
612 
613  // Parse the ellipsis, if given.
614  SourceLocation EllipsisLoc;
615  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
616  Diag(EllipsisLoc,
618  ? diag::warn_cxx98_compat_variadic_templates
619  : diag::ext_variadic_templates);
620 
621  // Get the identifier, if given.
622  SourceLocation NameLoc;
623  IdentifierInfo *ParamName = nullptr;
624  if (Tok.is(tok::identifier)) {
625  ParamName = Tok.getIdentifierInfo();
626  NameLoc = ConsumeToken();
627  } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
628  tok::greatergreater)) {
629  // Unnamed template parameter. Don't have to do anything here, just
630  // don't consume this token.
631  } else {
632  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
633  return nullptr;
634  }
635 
636  // Recover from misplaced ellipsis.
637  bool AlreadyHasEllipsis = EllipsisLoc.isValid();
638  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
639  DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
640 
641  TemplateParameterList *ParamList =
643  TemplateLoc, LAngleLoc,
644  TemplateParams,
645  RAngleLoc, nullptr);
646 
647  // Grab a default argument (if available).
648  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
649  // we introduce the template parameter into the local scope.
650  SourceLocation EqualLoc;
651  ParsedTemplateArgument DefaultArg;
652  if (TryConsumeToken(tok::equal, EqualLoc)) {
653  DefaultArg = ParseTemplateTemplateArgument();
654  if (DefaultArg.isInvalid()) {
655  Diag(Tok.getLocation(),
656  diag::err_default_template_template_parameter_not_template);
657  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
659  }
660  }
661 
662  return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
663  ParamList, EllipsisLoc,
664  ParamName, NameLoc, Depth,
665  Position, EqualLoc, DefaultArg);
666 }
667 
668 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
669 /// template parameters (e.g., in "template<int Size> class array;").
670 ///
671 /// template-parameter:
672 /// ...
673 /// parameter-declaration
674 NamedDecl *
675 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
676  // Parse the declaration-specifiers (i.e., the type).
677  // FIXME: The type should probably be restricted in some way... Not all
678  // declarators (parts of declarators?) are accepted for parameters.
679  DeclSpec DS(AttrFactory);
680  ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
681  DeclSpecContext::DSC_template_param);
682 
683  // Parse this as a typename.
685  ParseDeclarator(ParamDecl);
686  if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
687  Diag(Tok.getLocation(), diag::err_expected_template_parameter);
688  return nullptr;
689  }
690 
691  // Recover from misplaced ellipsis.
692  SourceLocation EllipsisLoc;
693  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
694  DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
695 
696  // If there is a default value, parse it.
697  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
698  // we introduce the template parameter into the local scope.
699  SourceLocation EqualLoc;
700  ExprResult DefaultArg;
701  if (TryConsumeToken(tok::equal, EqualLoc)) {
702  // C++ [temp.param]p15:
703  // When parsing a default template-argument for a non-type
704  // template-parameter, the first non-nested > is taken as the
705  // end of the template-parameter-list rather than a greater-than
706  // operator.
707  GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
708  EnterExpressionEvaluationContext ConstantEvaluated(
710 
712  if (DefaultArg.isInvalid())
713  SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
714  }
715 
716  // Create the parameter.
717  return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
718  Depth, Position, EqualLoc,
719  DefaultArg.get());
720 }
721 
722 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
723  SourceLocation CorrectLoc,
724  bool AlreadyHasEllipsis,
725  bool IdentifierHasName) {
726  FixItHint Insertion;
727  if (!AlreadyHasEllipsis)
728  Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
729  Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
730  << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
731  << !IdentifierHasName;
732 }
733 
734 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
735  Declarator &D) {
736  assert(EllipsisLoc.isValid());
737  bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
738  if (!AlreadyHasEllipsis)
739  D.setEllipsisLoc(EllipsisLoc);
740  DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
741  AlreadyHasEllipsis, D.hasName());
742 }
743 
744 /// Parses a '>' at the end of a template list.
745 ///
746 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
747 /// to determine if these tokens were supposed to be a '>' followed by
748 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
749 ///
750 /// \param RAngleLoc the location of the consumed '>'.
751 ///
752 /// \param ConsumeLastToken if true, the '>' is consumed.
753 ///
754 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
755 /// type parameter or type argument list, rather than a C++ template parameter
756 /// or argument list.
757 ///
758 /// \returns true, if current token does not start with '>', false otherwise.
759 bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
760  bool ConsumeLastToken,
761  bool ObjCGenericList) {
762  // What will be left once we've consumed the '>'.
763  tok::TokenKind RemainingToken;
764  const char *ReplacementStr = "> >";
765  bool MergeWithNextToken = false;
766 
767  switch (Tok.getKind()) {
768  default:
769  Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
770  return true;
771 
772  case tok::greater:
773  // Determine the location of the '>' token. Only consume this token
774  // if the caller asked us to.
775  RAngleLoc = Tok.getLocation();
776  if (ConsumeLastToken)
777  ConsumeToken();
778  return false;
779 
780  case tok::greatergreater:
781  RemainingToken = tok::greater;
782  break;
783 
784  case tok::greatergreatergreater:
785  RemainingToken = tok::greatergreater;
786  break;
787 
788  case tok::greaterequal:
789  RemainingToken = tok::equal;
790  ReplacementStr = "> =";
791 
792  // Join two adjacent '=' tokens into one, for cases like:
793  // void (*p)() = f<int>;
794  // return f<int>==p;
795  if (NextToken().is(tok::equal) &&
796  areTokensAdjacent(Tok, NextToken())) {
797  RemainingToken = tok::equalequal;
798  MergeWithNextToken = true;
799  }
800  break;
801 
802  case tok::greatergreaterequal:
803  RemainingToken = tok::greaterequal;
804  break;
805  }
806 
807  // This template-id is terminated by a token that starts with a '>'.
808  // Outside C++11 and Objective-C, this is now error recovery.
809  //
810  // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
811  // extend that treatment to also apply to the '>>>' token.
812  //
813  // Objective-C allows this in its type parameter / argument lists.
814 
815  SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
816  SourceLocation TokLoc = Tok.getLocation();
817  Token Next = NextToken();
818 
819  // Whether splitting the current token after the '>' would undesirably result
820  // in the remaining token pasting with the token after it. This excludes the
821  // MergeWithNextToken cases, which we've already handled.
822  bool PreventMergeWithNextToken =
823  (RemainingToken == tok::greater ||
824  RemainingToken == tok::greatergreater) &&
825  (Next.isOneOf(tok::greater, tok::greatergreater,
826  tok::greatergreatergreater, tok::equal, tok::greaterequal,
827  tok::greatergreaterequal, tok::equalequal)) &&
828  areTokensAdjacent(Tok, Next);
829 
830  // Diagnose this situation as appropriate.
831  if (!ObjCGenericList) {
832  // The source range of the replaced token(s).
834  TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
835  getLangOpts()));
836 
837  // A hint to put a space between the '>>'s. In order to make the hint as
838  // clear as possible, we include the characters either side of the space in
839  // the replacement, rather than just inserting a space at SecondCharLoc.
840  FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
841  ReplacementStr);
842 
843  // A hint to put another space after the token, if it would otherwise be
844  // lexed differently.
845  FixItHint Hint2;
846  if (PreventMergeWithNextToken)
847  Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
848 
849  unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
850  if (getLangOpts().CPlusPlus11 &&
851  (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
852  DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
853  else if (Tok.is(tok::greaterequal))
854  DiagId = diag::err_right_angle_bracket_equal_needs_space;
855  Diag(TokLoc, DiagId) << Hint1 << Hint2;
856  }
857 
858  // Find the "length" of the resulting '>' token. This is not always 1, as it
859  // can contain escaped newlines.
860  unsigned GreaterLength = Lexer::getTokenPrefixLength(
861  TokLoc, 1, PP.getSourceManager(), getLangOpts());
862 
863  // Annotate the source buffer to indicate that we split the token after the
864  // '>'. This allows us to properly find the end of, and extract the spelling
865  // of, the '>' token later.
866  RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
867 
868  // Strip the initial '>' from the token.
869  bool CachingTokens = PP.IsPreviousCachedToken(Tok);
870 
871  Token Greater = Tok;
872  Greater.setLocation(RAngleLoc);
873  Greater.setKind(tok::greater);
874  Greater.setLength(GreaterLength);
875 
876  unsigned OldLength = Tok.getLength();
877  if (MergeWithNextToken) {
878  ConsumeToken();
879  OldLength += Tok.getLength();
880  }
881 
882  Tok.setKind(RemainingToken);
883  Tok.setLength(OldLength - GreaterLength);
884 
885  // Split the second token if lexing it normally would lex a different token
886  // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
887  SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
888  if (PreventMergeWithNextToken)
889  AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
890  Tok.setLocation(AfterGreaterLoc);
891 
892  // Update the token cache to match what we just did if necessary.
893  if (CachingTokens) {
894  // If the previous cached token is being merged, delete it.
895  if (MergeWithNextToken)
897 
898  if (ConsumeLastToken)
900  else
901  PP.ReplacePreviousCachedToken({Greater});
902  }
903 
904  if (ConsumeLastToken) {
905  PrevTokLocation = RAngleLoc;
906  } else {
907  PrevTokLocation = TokBeforeGreaterLoc;
908  PP.EnterToken(Tok);
909  Tok = Greater;
910  }
911 
912  return false;
913 }
914 
915 
916 /// Parses a template-id that after the template name has
917 /// already been parsed.
918 ///
919 /// This routine takes care of parsing the enclosed template argument
920 /// list ('<' template-parameter-list [opt] '>') and placing the
921 /// results into a form that can be transferred to semantic analysis.
922 ///
923 /// \param ConsumeLastToken if true, then we will consume the last
924 /// token that forms the template-id. Otherwise, we will leave the
925 /// last token in the stream (e.g., so that it can be replaced with an
926 /// annotation token).
927 bool
928 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
929  SourceLocation &LAngleLoc,
930  TemplateArgList &TemplateArgs,
931  SourceLocation &RAngleLoc) {
932  assert(Tok.is(tok::less) && "Must have already parsed the template-name");
933 
934  // Consume the '<'.
935  LAngleLoc = ConsumeToken();
936 
937  // Parse the optional template-argument-list.
938  bool Invalid = false;
939  {
940  GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
941  if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
942  Invalid = ParseTemplateArgumentList(TemplateArgs);
943 
944  if (Invalid) {
945  // Try to find the closing '>'.
946  if (ConsumeLastToken)
947  SkipUntil(tok::greater, StopAtSemi);
948  else
949  SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
950  return true;
951  }
952  }
953 
954  return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken,
955  /*ObjCGenericList=*/false);
956 }
957 
958 /// Replace the tokens that form a simple-template-id with an
959 /// annotation token containing the complete template-id.
960 ///
961 /// The first token in the stream must be the name of a template that
962 /// is followed by a '<'. This routine will parse the complete
963 /// simple-template-id and replace the tokens with a single annotation
964 /// token with one of two different kinds: if the template-id names a
965 /// type (and \p AllowTypeAnnotation is true), the annotation token is
966 /// a type annotation that includes the optional nested-name-specifier
967 /// (\p SS). Otherwise, the annotation token is a template-id
968 /// annotation that does not include the optional
969 /// nested-name-specifier.
970 ///
971 /// \param Template the declaration of the template named by the first
972 /// token (an identifier), as returned from \c Action::isTemplateName().
973 ///
974 /// \param TNK the kind of template that \p Template
975 /// refers to, as returned from \c Action::isTemplateName().
976 ///
977 /// \param SS if non-NULL, the nested-name-specifier that precedes
978 /// this template name.
979 ///
980 /// \param TemplateKWLoc if valid, specifies that this template-id
981 /// annotation was preceded by the 'template' keyword and gives the
982 /// location of that keyword. If invalid (the default), then this
983 /// template-id was not preceded by a 'template' keyword.
984 ///
985 /// \param AllowTypeAnnotation if true (the default), then a
986 /// simple-template-id that refers to a class template, template
987 /// template parameter, or other template that produces a type will be
988 /// replaced with a type annotation token. Otherwise, the
989 /// simple-template-id is always replaced with a template-id
990 /// annotation token.
991 ///
992 /// If an unrecoverable parse error occurs and no annotation token can be
993 /// formed, this function returns true.
994 ///
995 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
996  CXXScopeSpec &SS,
997  SourceLocation TemplateKWLoc,
999  bool AllowTypeAnnotation) {
1000  assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
1001  assert(Template && Tok.is(tok::less) &&
1002  "Parser isn't at the beginning of a template-id");
1003 
1004  // Consume the template-name.
1005  SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
1006 
1007  // Parse the enclosed template argument list.
1008  SourceLocation LAngleLoc, RAngleLoc;
1009  TemplateArgList TemplateArgs;
1010  bool Invalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
1011  TemplateArgs,
1012  RAngleLoc);
1013 
1014  if (Invalid) {
1015  // If we failed to parse the template ID but skipped ahead to a >, we're not
1016  // going to be able to form a token annotation. Eat the '>' if present.
1017  TryConsumeToken(tok::greater);
1018  return true;
1019  }
1020 
1021  ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
1022 
1023  // Build the annotation token.
1024  if (TNK == TNK_Type_template && AllowTypeAnnotation) {
1026  SS, TemplateKWLoc, Template, TemplateName.Identifier,
1027  TemplateNameLoc, LAngleLoc, TemplateArgsPtr, RAngleLoc);
1028  if (Type.isInvalid()) {
1029  // If we failed to parse the template ID but skipped ahead to a >, we're
1030  // not going to be able to form a token annotation. Eat the '>' if
1031  // present.
1032  TryConsumeToken(tok::greater);
1033  return true;
1034  }
1035 
1036  Tok.setKind(tok::annot_typename);
1037  setTypeAnnotation(Tok, Type.get());
1038  if (SS.isNotEmpty())
1039  Tok.setLocation(SS.getBeginLoc());
1040  else if (TemplateKWLoc.isValid())
1041  Tok.setLocation(TemplateKWLoc);
1042  else
1043  Tok.setLocation(TemplateNameLoc);
1044  } else {
1045  // Build a template-id annotation token that can be processed
1046  // later.
1047  Tok.setKind(tok::annot_template_id);
1048 
1049  IdentifierInfo *TemplateII =
1050  TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1051  ? TemplateName.Identifier
1052  : nullptr;
1053 
1054  OverloadedOperatorKind OpKind =
1055  TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1056  ? OO_None
1057  : TemplateName.OperatorFunctionId.Operator;
1058 
1060  SS, TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1061  LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
1062 
1063  Tok.setAnnotationValue(TemplateId);
1064  if (TemplateKWLoc.isValid())
1065  Tok.setLocation(TemplateKWLoc);
1066  else
1067  Tok.setLocation(TemplateNameLoc);
1068  }
1069 
1070  // Common fields for the annotation token
1071  Tok.setAnnotationEndLoc(RAngleLoc);
1072 
1073  // In case the tokens were cached, have Preprocessor replace them with the
1074  // annotation token.
1075  PP.AnnotateCachedTokens(Tok);
1076  return false;
1077 }
1078 
1079 /// Replaces a template-id annotation token with a type
1080 /// annotation token.
1081 ///
1082 /// If there was a failure when forming the type from the template-id,
1083 /// a type annotation token will still be created, but will have a
1084 /// NULL type pointer to signify an error.
1085 ///
1086 /// \param IsClassName Is this template-id appearing in a context where we
1087 /// know it names a class, such as in an elaborated-type-specifier or
1088 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
1089 /// in those contexts.)
1090 void Parser::AnnotateTemplateIdTokenAsType(bool IsClassName) {
1091  assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1092 
1093  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1094  assert((TemplateId->Kind == TNK_Type_template ||
1095  TemplateId->Kind == TNK_Dependent_template_name) &&
1096  "Only works for type and dependent templates");
1097 
1098  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1099  TemplateId->NumArgs);
1100 
1101  TypeResult Type
1102  = Actions.ActOnTemplateIdType(TemplateId->SS,
1103  TemplateId->TemplateKWLoc,
1104  TemplateId->Template,
1105  TemplateId->Name,
1106  TemplateId->TemplateNameLoc,
1107  TemplateId->LAngleLoc,
1108  TemplateArgsPtr,
1109  TemplateId->RAngleLoc,
1110  /*IsCtorOrDtorName*/false,
1111  IsClassName);
1112  // Create the new "type" annotation token.
1113  Tok.setKind(tok::annot_typename);
1114  setTypeAnnotation(Tok, Type.isInvalid() ? nullptr : Type.get());
1115  if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
1116  Tok.setLocation(TemplateId->SS.getBeginLoc());
1117  // End location stays the same
1118 
1119  // Replace the template-id annotation token, and possible the scope-specifier
1120  // that precedes it, with the typename annotation token.
1121  PP.AnnotateCachedTokens(Tok);
1122 }
1123 
1124 /// Determine whether the given token can end a template argument.
1125 static bool isEndOfTemplateArgument(Token Tok) {
1126  return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater);
1127 }
1128 
1129 /// Parse a C++ template template argument.
1130 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1131  if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1132  !Tok.is(tok::annot_cxxscope))
1133  return ParsedTemplateArgument();
1134 
1135  // C++0x [temp.arg.template]p1:
1136  // A template-argument for a template template-parameter shall be the name
1137  // of a class template or an alias template, expressed as id-expression.
1138  //
1139  // We parse an id-expression that refers to a class template or alias
1140  // template. The grammar we parse is:
1141  //
1142  // nested-name-specifier[opt] template[opt] identifier ...[opt]
1143  //
1144  // followed by a token that terminates a template argument, such as ',',
1145  // '>', or (in some cases) '>>'.
1146  CXXScopeSpec SS; // nested-name-specifier, if present
1147  ParseOptionalCXXScopeSpecifier(SS, nullptr,
1148  /*EnteringContext=*/false);
1149 
1151  SourceLocation EllipsisLoc;
1152  if (SS.isSet() && Tok.is(tok::kw_template)) {
1153  // Parse the optional 'template' keyword following the
1154  // nested-name-specifier.
1155  SourceLocation TemplateKWLoc = ConsumeToken();
1156 
1157  if (Tok.is(tok::identifier)) {
1158  // We appear to have a dependent template name.
1159  UnqualifiedId Name;
1160  Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1161  ConsumeToken(); // the identifier
1162 
1163  TryConsumeToken(tok::ellipsis, EllipsisLoc);
1164 
1165  // If the next token signals the end of a template argument,
1166  // then we have a dependent template name that could be a template
1167  // template argument.
1168  TemplateTy Template;
1169  if (isEndOfTemplateArgument(Tok) &&
1171  getCurScope(), SS, TemplateKWLoc, Name,
1172  /*ObjectType=*/nullptr,
1173  /*EnteringContext=*/false, Template))
1174  Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1175  }
1176  } else if (Tok.is(tok::identifier)) {
1177  // We may have a (non-dependent) template name.
1178  TemplateTy Template;
1179  UnqualifiedId Name;
1180  Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1181  ConsumeToken(); // the identifier
1182 
1183  TryConsumeToken(tok::ellipsis, EllipsisLoc);
1184 
1185  if (isEndOfTemplateArgument(Tok)) {
1186  bool MemberOfUnknownSpecialization;
1187  TemplateNameKind TNK = Actions.isTemplateName(
1188  getCurScope(), SS,
1189  /*hasTemplateKeyword=*/false, Name,
1190  /*ObjectType=*/nullptr,
1191  /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1192  if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1193  // We have an id-expression that refers to a class template or
1194  // (C++0x) alias template.
1195  Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1196  }
1197  }
1198  }
1199 
1200  // If this is a pack expansion, build it as such.
1201  if (EllipsisLoc.isValid() && !Result.isInvalid())
1202  Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1203 
1204  return Result;
1205 }
1206 
1207 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1208 ///
1209 /// template-argument: [C++ 14.2]
1210 /// constant-expression
1211 /// type-id
1212 /// id-expression
1213 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1214  // C++ [temp.arg]p2:
1215  // In a template-argument, an ambiguity between a type-id and an
1216  // expression is resolved to a type-id, regardless of the form of
1217  // the corresponding template-parameter.
1218  //
1219  // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1220  // up and annotate an identifier as an id-expression during disambiguation,
1221  // so enter the appropriate context for a constant expression template
1222  // argument before trying to disambiguate.
1223 
1224  EnterExpressionEvaluationContext EnterConstantEvaluated(
1226  /*LambdaContextDecl=*/nullptr,
1228  if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1229  TypeResult TypeArg = ParseTypeName(
1230  /*Range=*/nullptr, DeclaratorContext::TemplateArgContext);
1231  return Actions.ActOnTemplateTypeArgument(TypeArg);
1232  }
1233 
1234  // Try to parse a template template argument.
1235  {
1236  TentativeParsingAction TPA(*this);
1237 
1238  ParsedTemplateArgument TemplateTemplateArgument
1239  = ParseTemplateTemplateArgument();
1240  if (!TemplateTemplateArgument.isInvalid()) {
1241  TPA.Commit();
1242  return TemplateTemplateArgument;
1243  }
1244 
1245  // Revert this tentative parse to parse a non-type template argument.
1246  TPA.Revert();
1247  }
1248 
1249  // Parse a non-type template argument.
1250  SourceLocation Loc = Tok.getLocation();
1252  if (ExprArg.isInvalid() || !ExprArg.get())
1253  return ParsedTemplateArgument();
1254 
1256  ExprArg.get(), Loc);
1257 }
1258 
1259 /// Determine whether the current tokens can only be parsed as a
1260 /// template argument list (starting with the '<') and never as a '<'
1261 /// expression.
1262 bool Parser::IsTemplateArgumentList(unsigned Skip) {
1263  struct AlwaysRevertAction : TentativeParsingAction {
1264  AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1265  ~AlwaysRevertAction() { Revert(); }
1266  } Tentative(*this);
1267 
1268  while (Skip) {
1269  ConsumeAnyToken();
1270  --Skip;
1271  }
1272 
1273  // '<'
1274  if (!TryConsumeToken(tok::less))
1275  return false;
1276 
1277  // An empty template argument list.
1278  if (Tok.is(tok::greater))
1279  return true;
1280 
1281  // See whether we have declaration specifiers, which indicate a type.
1282  while (isCXXDeclarationSpecifier() == TPResult::True)
1283  ConsumeAnyToken();
1284 
1285  // If we have a '>' or a ',' then this is a template argument list.
1286  return Tok.isOneOf(tok::greater, tok::comma);
1287 }
1288 
1289 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1290 /// (C++ [temp.names]). Returns true if there was an error.
1291 ///
1292 /// template-argument-list: [C++ 14.2]
1293 /// template-argument
1294 /// template-argument-list ',' template-argument
1295 bool
1296 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1297 
1298  ColonProtectionRAIIObject ColonProtection(*this, false);
1299 
1300  do {
1301  ParsedTemplateArgument Arg = ParseTemplateArgument();
1302  SourceLocation EllipsisLoc;
1303  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1304  Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1305 
1306  if (Arg.isInvalid()) {
1307  SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1308  return true;
1309  }
1310 
1311  // Save this template argument.
1312  TemplateArgs.push_back(Arg);
1313 
1314  // If the next token is a comma, consume it and keep reading
1315  // arguments.
1316  } while (TryConsumeToken(tok::comma));
1317 
1318  return false;
1319 }
1320 
1321 /// Parse a C++ explicit template instantiation
1322 /// (C++ [temp.explicit]).
1323 ///
1324 /// explicit-instantiation:
1325 /// 'extern' [opt] 'template' declaration
1326 ///
1327 /// Note that the 'extern' is a GNU extension and C++11 feature.
1328 Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
1329  SourceLocation ExternLoc,
1330  SourceLocation TemplateLoc,
1331  SourceLocation &DeclEnd,
1332  ParsedAttributes &AccessAttrs,
1333  AccessSpecifier AS) {
1334  // This isn't really required here.
1336  ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1337 
1338  return ParseSingleDeclarationAfterTemplate(
1339  Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
1340  ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
1341 }
1342 
1344  if (TemplateParams)
1345  return getTemplateParamsRange(TemplateParams->data(),
1346  TemplateParams->size());
1347 
1348  SourceRange R(TemplateLoc);
1349  if (ExternLoc.isValid())
1350  R.setBegin(ExternLoc);
1351  return R;
1352 }
1353 
1354 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1355  ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1356 }
1357 
1358 /// Late parse a C++ function template in Microsoft mode.
1359 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1360  if (!LPT.D)
1361  return;
1362 
1363  // Get the FunctionDecl.
1364  FunctionDecl *FunD = LPT.D->getAsFunction();
1365  // Track template parameter depth.
1366  TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1367 
1368  // To restore the context after late parsing.
1369  Sema::ContextRAII GlobalSavedContext(
1370  Actions, Actions.Context.getTranslationUnitDecl());
1371 
1372  SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1373 
1374  // Get the list of DeclContexts to reenter.
1375  SmallVector<DeclContext*, 4> DeclContextsToReenter;
1376  DeclContext *DD = FunD;
1377  while (DD && !DD->isTranslationUnit()) {
1378  DeclContextsToReenter.push_back(DD);
1379  DD = DD->getLexicalParent();
1380  }
1381 
1382  // Reenter template scopes from outermost to innermost.
1384  DeclContextsToReenter.rbegin();
1385  for (; II != DeclContextsToReenter.rend(); ++II) {
1386  TemplateParamScopeStack.push_back(new ParseScope(this,
1388  unsigned NumParamLists =
1389  Actions.ActOnReenterTemplateScope(getCurScope(), cast<Decl>(*II));
1390  CurTemplateDepthTracker.addDepth(NumParamLists);
1391  if (*II != FunD) {
1392  TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1393  Actions.PushDeclContext(Actions.getCurScope(), *II);
1394  }
1395  }
1396 
1397  assert(!LPT.Toks.empty() && "Empty body!");
1398 
1399  // Append the current token at the end of the new token stream so that it
1400  // doesn't get lost.
1401  LPT.Toks.push_back(Tok);
1402  PP.EnterTokenStream(LPT.Toks, true);
1403 
1404  // Consume the previously pushed token.
1405  ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1406  assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1407  "Inline method not starting with '{', ':' or 'try'");
1408 
1409  // Parse the method body. Function body parsing code is similar enough
1410  // to be re-used for method bodies as well.
1411  ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
1413 
1414  // Recreate the containing function DeclContext.
1415  Sema::ContextRAII FunctionSavedContext(Actions,
1416  Actions.getContainingDC(FunD));
1417 
1418  Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1419 
1420  if (Tok.is(tok::kw_try)) {
1421  ParseFunctionTryBlock(LPT.D, FnScope);
1422  } else {
1423  if (Tok.is(tok::colon))
1424  ParseConstructorInitializer(LPT.D);
1425  else
1426  Actions.ActOnDefaultCtorInitializers(LPT.D);
1427 
1428  if (Tok.is(tok::l_brace)) {
1429  assert((!isa<FunctionTemplateDecl>(LPT.D) ||
1430  cast<FunctionTemplateDecl>(LPT.D)
1431  ->getTemplateParameters()
1432  ->getDepth() == TemplateParameterDepth - 1) &&
1433  "TemplateParameterDepth should be greater than the depth of "
1434  "current template being instantiated!");
1435  ParseFunctionStatementBody(LPT.D, FnScope);
1436  Actions.UnmarkAsLateParsedTemplate(FunD);
1437  } else
1438  Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1439  }
1440 
1441  // Exit scopes.
1442  FnScope.Exit();
1444  TemplateParamScopeStack.rbegin();
1445  for (; I != TemplateParamScopeStack.rend(); ++I)
1446  delete *I;
1447 }
1448 
1449 /// Lex a delayed template function for late parsing.
1450 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1451  tok::TokenKind kind = Tok.getKind();
1452  if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1453  // Consume everything up to (and including) the matching right brace.
1454  ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1455  }
1456 
1457  // If we're in a function-try-block, we need to store all the catch blocks.
1458  if (kind == tok::kw_try) {
1459  while (Tok.is(tok::kw_catch)) {
1460  ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1461  ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1462  }
1463  }
1464 }
1465 
1466 /// We've parsed something that could plausibly be intended to be a template
1467 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
1468 /// be an expression. Determine if this is likely to be a template-id and if so,
1469 /// diagnose it.
1470 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
1471  TentativeParsingAction TPA(*this);
1472  // FIXME: We could look at the token sequence in a lot more detail here.
1473  if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
1475  TPA.Commit();
1476 
1478  ParseGreaterThanInTemplateList(Greater, true, false);
1479  Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
1480  Less, Greater);
1481  return true;
1482  }
1483 
1484  // There's no matching '>' token, this probably isn't supposed to be
1485  // interpreted as a template-id. Parse it as an (ill-formed) comparison.
1486  TPA.Revert();
1487  return false;
1488 }
1489 
1490 void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
1491  assert(Tok.is(tok::less) && "not at a potential angle bracket");
1492 
1493  bool DependentTemplateName = false;
1494  if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
1495  DependentTemplateName))
1496  return;
1497 
1498  // OK, this might be a name that the user intended to be parsed as a
1499  // template-name, followed by a '<' token. Check for some easy cases.
1500 
1501  // If we have potential_template<>, then it's supposed to be a template-name.
1502  if (NextToken().is(tok::greater) ||
1503  (getLangOpts().CPlusPlus11 &&
1504  NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
1505  SourceLocation Less = ConsumeToken();
1507  ParseGreaterThanInTemplateList(Greater, true, false);
1508  Actions.diagnoseExprIntendedAsTemplateName(
1509  getCurScope(), PotentialTemplateName, Less, Greater);
1510  // FIXME: Perform error recovery.
1511  PotentialTemplateName = ExprError();
1512  return;
1513  }
1514 
1515  // If we have 'potential_template<type-id', assume it's supposed to be a
1516  // template-name if there's a matching '>' later on.
1517  {
1518  // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
1519  TentativeParsingAction TPA(*this);
1520  SourceLocation Less = ConsumeToken();
1521  if (isTypeIdUnambiguously() &&
1522  diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
1523  TPA.Commit();
1524  // FIXME: Perform error recovery.
1525  PotentialTemplateName = ExprError();
1526  return;
1527  }
1528  TPA.Revert();
1529  }
1530 
1531  // Otherwise, remember that we saw this in case we see a potentially-matching
1532  // '>' token later on.
1533  AngleBracketTracker::Priority Priority =
1534  (DependentTemplateName ? AngleBracketTracker::DependentName
1535  : AngleBracketTracker::PotentialTypo) |
1536  (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
1537  : AngleBracketTracker::NoSpaceBeforeLess);
1538  AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
1539  Priority);
1540 }
1541 
1542 bool Parser::checkPotentialAngleBracketDelimiter(
1543  const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
1544  // If a comma in an expression context is followed by a type that can be a
1545  // template argument and cannot be an expression, then this is ill-formed,
1546  // but might be intended to be part of a template-id.
1547  if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
1548  diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
1549  AngleBrackets.clear(*this);
1550  return true;
1551  }
1552 
1553  // If a context that looks like a template-id is followed by '()', then
1554  // this is ill-formed, but might be intended to be a template-id
1555  // followed by '()'.
1556  if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
1557  NextToken().is(tok::r_paren)) {
1558  Actions.diagnoseExprIntendedAsTemplateName(
1559  getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
1560  OpToken.getLocation());
1561  AngleBrackets.clear(*this);
1562  return true;
1563  }
1564 
1565  // After a '>' (etc), we're no longer potentially in a construct that's
1566  // intended to be treated as a template-id.
1567  if (OpToken.is(tok::greater) ||
1568  (getLangOpts().CPlusPlus11 &&
1569  OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
1570  AngleBrackets.clear(*this);
1571  return false;
1572 }
Defines the clang::ASTContext interface.
void ReplacePreviousCachedToken(ArrayRef< Token > NewToks)
Replace token in CachedLexPos - 1 in CachedTokens by the tokens in NewToks.
Definition: PPCaching.cpp:170
Represents a function declaration or definition.
Definition: Decl.h:1714
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
SourceRange getSourceRange() const LLVM_READONLY
Return the source range that covers this unqualified-id.
Definition: DeclSpec.h:1120
SourceLocation StartLocation
The location of the first token that describes this unqualified-id, which will be the location of the...
Definition: DeclSpec.h:978
IdentifierInfo * Identifier
When Kind == IK_Identifier, the parsed identifier, or when Kind == IK_UserLiteralId, the identifier suffix.
Definition: DeclSpec.h:948
TemplateNameKind isTemplateName(Scope *S, CXXScopeSpec &SS, bool hasTemplateKeyword, const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext, TemplateTy &Template, bool &MemberOfUnknownSpecialization)
bool is(tok::TokenKind K) const
is/isNot - Predicates to check if this token is a specific kind, as in "if (Tok.is(tok::l_brace)) {...
Definition: Token.h:95
The name refers to a dependent template name:
Definition: TemplateKinds.h:46
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
RAII object used to inform the actions that we&#39;re currently parsing a declaration.
Defines the C++ template declaration subclasses.
StringRef P
The base class of the type hierarchy.
Definition: Type.h:1428
This indicates that the scope corresponds to a function, which means that labels are set here...
Definition: Scope.h:47
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:98
Parser - This implements a parser for the C family of languages.
Definition: Parser.h:57
static TemplateIdAnnotation * Create(CXXScopeSpec SS, SourceLocation TemplateKWLoc, SourceLocation TemplateNameLoc, IdentifierInfo *Name, OverloadedOperatorKind OperatorKind, ParsedTemplateTy OpaqueTemplateName, TemplateNameKind TemplateKind, SourceLocation LAngleLoc, SourceLocation RAngleLoc, ArrayRef< ParsedTemplateArgument > TemplateArgs, SmallVectorImpl< TemplateIdAnnotation *> &CleanupList)
Creates a new TemplateIdAnnotation with NumArgs arguments and appends it to List. ...
RAII object that enters a new expression evaluation context.
Definition: Sema.h:10733
void EnterToken(const Token &Tok)
Enters a token in the token stream to be lexed next.
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1749
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:68
friend class ObjCDeclContextSwitch
Definition: Parser.h:61
ColonProtectionRAIIObject - This sets the Parser::ColonIsSacred bool and restores it when destroyed...
tok::TokenKind getKind() const
Definition: Token.h:90
bool SkipUntil(tok::TokenKind T, SkipUntilFlags Flags=static_cast< SkipUntilFlags >(0))
SkipUntil - Read tokens until we get to the specified token, then consume it (unless StopBeforeMatch ...
Definition: Parser.h:1039
Information about a template-id annotation token.
Represents a struct/union/class.
Definition: Decl.h:3559
const Token & NextToken()
NextToken - This peeks ahead one token and returns it without consuming it.
Definition: Parser.h:707
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Computes the source location just past the end of the token at this source location.
bool TryConsumeToken(tok::TokenKind Expected)
Definition: Parser.h:412
One of these records is kept for each identifier that is lexed.
Represents a dependent template name that cannot be resolved prior to template instantiation.
Definition: TemplateName.h:422
OverloadedOperatorKind Operator
The kind of overloaded operator.
Definition: DeclSpec.h:931
struct OFI OperatorFunctionId
When Kind == IK_OperatorFunctionId, the overloaded operator that we parsed.
Definition: DeclSpec.h:952
CachedTokens Toks
Definition: Sema.h:10788
Token - This structure provides full information about a lexed token.
Definition: Token.h:35
A non-type template parameter, stored as an expression.
void setKind(tok::TokenKind K)
Definition: Token.h:91
NamedDecl * ActOnTemplateTemplateParameter(Scope *S, SourceLocation TmpLoc, TemplateParameterList *Params, SourceLocation EllipsisLoc, IdentifierInfo *ParamName, SourceLocation ParamNameLoc, unsigned Depth, unsigned Position, SourceLocation EqualLoc, ParsedTemplateArgument DefaultArg)
ActOnTemplateTemplateParameter - Called when a C++ template template parameter (e.g.
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:920
PtrTy get() const
Definition: Ownership.h:174
ExprResult CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl=nullptr, llvm::function_ref< ExprResult(Expr *)> Filter=[](Expr *E) -> ExprResult { return E;})
Process any TypoExprs in the given Expr and its children, generating diagnostics as appropriate and r...
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
bool IsPreviousCachedToken(const Token &Tok) const
Whether Tok is the most recent token (CachedLexPos - 1) in CachedTokens.
Definition: PPCaching.cpp:152
static SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart, unsigned Characters, const SourceManager &SM, const LangOptions &LangOpts)
AdvanceToTokenCharacter - If the current SourceLocation specifies a location at the start of a token...
Definition: Lexer.h:349
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
SourceLocation ConsumeAnyToken(bool ConsumeCodeCompletionTok=false)
ConsumeAnyToken - Dispatch to the right Consume* method based on the current token type...
Definition: Parser.h:432
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
unsigned getFlags() const
getFlags - Return the flags for this scope.
Definition: Scope.h:217
bool isOneOf(A K1, B K2) const
Definition: FormatToken.h:319
A class for parsing a declarator.
TemplateParameterList * ActOnTemplateParameterList(unsigned Depth, SourceLocation ExportLoc, SourceLocation TemplateLoc, SourceLocation LAngleLoc, ArrayRef< NamedDecl *> Params, SourceLocation RAngleLoc, Expr *RequiresClause)
ActOnTemplateParameterList - Builds a TemplateParameterList, optionally constrained by RequiresClause...
DeclContext * getLexicalParent()
getLexicalParent - Returns the containing lexical DeclContext.
Definition: DeclBase.h:1357
void setAnnotationValue(void *val)
Definition: Token.h:228
Decl * ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS, RecordDecl *&AnonRecord)
ParsedFreeStandingDeclSpec - This method is invoked when a declspec with no declarator (e...
Definition: SemaDecl.cpp:4110
Represents a character-granular source range.
void AnnotateCachedTokens(const Token &Tok)
We notify the Preprocessor that if it is caching tokens (because backtrack is enabled) it should repl...
This file defines the classes used to store parsed information about declaration-specifiers and decla...
void SkipMalformedDecl()
SkipMalformedDecl - Read tokens until we get to some likely good stopping point for skipping past a s...
Definition: ParseDecl.cpp:1825
OpaquePtr< TemplateName > TemplateTy
Definition: Parser.h:376
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file. ...
Definition: Token.h:124
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:72
static bool isEndOfTemplateArgument(Token Tok)
Determine whether the given token can end a template argument.
Represents a C++ template name within the type system.
Definition: TemplateName.h:178
This is a compound statement scope.
Definition: Scope.h:130
int Depth
Definition: ASTDiff.cpp:191
UnqualifiedIdKind getKind() const
Determine what kind of name we have.
Definition: DeclSpec.h:1002
TemplateNameKind
Specifies the kind of template name that an identifier refers to.
Definition: TemplateKinds.h:21
DeclaratorContext
Definition: DeclSpec.h:1707
void setEllipsisLoc(SourceLocation EL)
Definition: DeclSpec.h:2440
bool isInvalid() const
Definition: Ownership.h:170
bool isUsable() const
Definition: Ownership.h:171
The result type of a method or function.
ParsedTemplateArgument ActOnPackExpansion(const ParsedTemplateArgument &Arg, SourceLocation EllipsisLoc)
Invoked when parsing a template argument followed by an ellipsis, which creates a pack expansion...
RAII object that makes &#39;>&#39; behave either as an operator or as the closing angle bracket for a templat...
const LangOptions & getLangOpts() const
Definition: Parser.h:359
static CharSourceRange getCharRange(SourceRange R)
SourceManager & getSourceManager() const
Definition: Preprocessor.h:825
A class for parsing a DeclSpec.
Stop skipping at semicolon.
Definition: Parser.h:1019
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:157
Represents the parsed form of a C++ template argument.
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
bool hasName() const
hasName - Whether this declarator has a name, which might be an identifier (accessible via getIdentif...
Definition: DeclSpec.h:2101
Encodes a location in the source.
void setLength(unsigned Len)
Definition: Token.h:133
bool is(tok::TokenKind Kind) const
Definition: FormatToken.h:310
IdentifierInfo * getIdentifierInfo() const
Definition: Token.h:177
void setAnnotationEndLoc(SourceLocation L)
Definition: Token.h:142
NamedDecl * ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, unsigned Depth, unsigned Position, SourceLocation EqualLoc, Expr *DefaultArg)
TemplateNameKind ActOnDependentTemplateName(Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext, TemplateTy &Template, bool AllowInjectedClassName=false)
Form a dependent template name.
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
Scope * getCurScope() const
Definition: Parser.h:366
static unsigned getTokenPrefixLength(SourceLocation TokStart, unsigned Characters, const SourceManager &SM, const LangOptions &LangOpts)
Get the physical length (including trigraphs and escaped newlines) of the first Characters characters...
Definition: Lexer.cpp:711
ExprResult ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast=NotTypeCast)
Definition: ParseExpr.cpp:200
bool isNot(tok::TokenKind K) const
Definition: Token.h:96
SourceLocation SplitToken(SourceLocation TokLoc, unsigned Length)
Split the first Length characters out of the token starting at TokLoc and return a location pointing ...
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1262
OverloadedOperatorKind
Enumeration specifying the different kinds of C++ overloaded operators.
Definition: OperatorKinds.h:22
SourceRange getSourceRange(const SourceRange &Range)
Returns the SourceRange of a SourceRange.
Definition: FixIt.h:34
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
This is a scope that corresponds to the template parameters of a C++ template.
Definition: Scope.h:77
ExprResult ParseConstraintExpression()
Parse a constraint-expression.
Definition: ParseExpr.cpp:226
bool isInvalid() const
Determine whether the given template argument is invalid.
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const
Definition: Token.h:97
The name refers to a template whose specialization produces a type.
Definition: TemplateKinds.h:30
static const TST TST_unspecified
Definition: DeclSpec.h:272
unsigned getLength() const
Definition: Token.h:127
NamedDecl * ActOnTypeParameter(Scope *S, bool Typename, SourceLocation EllipsisLoc, SourceLocation KeyLoc, IdentifierInfo *ParamName, SourceLocation ParamNameLoc, unsigned Depth, unsigned Position, SourceLocation EqualLoc, ParsedType DefaultArg)
ActOnTypeParameter - Called when a C++ template type parameter (e.g., "typename T") has been parsed...
Not an overloaded operator.
Definition: OperatorKinds.h:23
DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Definition: Parser.cpp:73
ParsedTemplateArgument ActOnTemplateTypeArgument(TypeResult ParsedType)
Convert a parsed type into a parsed template argument.
SourceRange getTemplateParamsRange(TemplateParameterList const *const *Params, unsigned NumParams)
Retrieves the range of the given template parameter lists.
ExprResult ParseAssignmentExpression(TypeCastState isTypeCast=NotTypeCast)
Parse an expr that doesn&#39;t include (top-level) commas.
Definition: ParseExpr.cpp:160
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:92
SmallVector< TemplateParameterList *, 4 > TemplateParameterLists
Definition: Parser.h:378
This is a scope that can contain a declaration.
Definition: Scope.h:59
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2117
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
TypeResult ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc, TemplateTy Template, IdentifierInfo *TemplateII, SourceLocation TemplateIILoc, SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgs, SourceLocation RAngleLoc, bool IsCtorOrDtorName=false, bool IsClassName=false)
Captures information about "declaration specifiers".
Definition: DeclSpec.h:228
SourceLocation ConsumeToken()
ConsumeToken - Consume the current &#39;peek token&#39; and lex the next one.
Definition: Parser.h:404
SourceLocation getEllipsisLoc() const
Definition: DeclSpec.h:2439
Decl * D
The template function declaration to be late parsed.
Definition: Sema.h:10790
bool isNotEmpty() const
A scope specifier is present, but may be valid or invalid.
Definition: DeclSpec.h:191
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:61
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:129
A template-id, e.g., f<int>.
ExprResult ExprError()
Definition: Ownership.h:283
Contains a late templated function.
Definition: Sema.h:10787
Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:66
void setLocation(SourceLocation L)
Definition: Token.h:132
A trivial tuple used to represent a source range.
This represents a decl that may have a name.
Definition: Decl.h:248
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc)
Specify that this unqualified-id was parsed as an identifier.
Definition: DeclSpec.h:1009
bool isTranslationUnit() const
Definition: DeclBase.h:1411
SourceLocation getBegin() const
ParsedAttributes - A collection of parsed attributes.
Definition: ParsedAttr.h:803
TypeResult ParseTypeName(SourceRange *Range=nullptr, DeclaratorContext Context=DeclaratorContext::TypeNameContext, AccessSpecifier AS=AS_none, Decl **OwnedType=nullptr, ParsedAttributes *Attrs=nullptr)
ParseTypeName type-name: [C99 6.7.6] specifier-qualifier-list abstract-declarator[opt].
Definition: ParseDecl.cpp:44
Stop skipping at specified token, but don&#39;t skip the token itself.
Definition: Parser.h:1021
A RAII object to temporarily push a declaration context.
Definition: Sema.h:706
SourceLocation getEndLoc() const
Definition: Token.h:151