clang  11.0.0git
ParseTemplate.cpp
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1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements parsing of C++ templates.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/DeclTemplate.h"
15 #include "clang/AST/ExprCXX.h"
17 #include "clang/Parse/Parser.h"
19 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/Scope.h"
22 #include "llvm/Support/TimeProfiler.h"
23 using namespace clang;
24 
25 /// Re-enter a possible template scope, creating as many template parameter
26 /// scopes as necessary.
27 /// \return The number of template parameter scopes entered.
29  return Actions.ActOnReenterTemplateScope(D, [&] {
31  return Actions.getCurScope();
32  });
33 }
34 
35 /// Parse a template declaration, explicit instantiation, or
36 /// explicit specialization.
37 Decl *Parser::ParseDeclarationStartingWithTemplate(
38  DeclaratorContext Context, SourceLocation &DeclEnd,
39  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
40  ObjCDeclContextSwitch ObjCDC(*this);
41 
42  if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
43  return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
44  DeclEnd, AccessAttrs, AS);
45  }
46  return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
47  AS);
48 }
49 
50 /// Parse a template declaration or an explicit specialization.
51 ///
52 /// Template declarations include one or more template parameter lists
53 /// and either the function or class template declaration. Explicit
54 /// specializations contain one or more 'template < >' prefixes
55 /// followed by a (possibly templated) declaration. Since the
56 /// syntactic form of both features is nearly identical, we parse all
57 /// of the template headers together and let semantic analysis sort
58 /// the declarations from the explicit specializations.
59 ///
60 /// template-declaration: [C++ temp]
61 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
62 ///
63 /// template-declaration: [C++2a]
64 /// template-head declaration
65 /// template-head concept-definition
66 ///
67 /// TODO: requires-clause
68 /// template-head: [C++2a]
69 /// 'template' '<' template-parameter-list '>'
70 /// requires-clause[opt]
71 ///
72 /// explicit-specialization: [ C++ temp.expl.spec]
73 /// 'template' '<' '>' declaration
74 Decl *Parser::ParseTemplateDeclarationOrSpecialization(
75  DeclaratorContext Context, SourceLocation &DeclEnd,
76  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
77  assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
78  "Token does not start a template declaration.");
79 
80  MultiParseScope TemplateParamScopes(*this);
81 
82  // Tell the action that names should be checked in the context of
83  // the declaration to come.
85  ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
86 
87  // Parse multiple levels of template headers within this template
88  // parameter scope, e.g.,
89  //
90  // template<typename T>
91  // template<typename U>
92  // class A<T>::B { ... };
93  //
94  // We parse multiple levels non-recursively so that we can build a
95  // single data structure containing all of the template parameter
96  // lists to easily differentiate between the case above and:
97  //
98  // template<typename T>
99  // class A {
100  // template<typename U> class B;
101  // };
102  //
103  // In the first case, the action for declaring A<T>::B receives
104  // both template parameter lists. In the second case, the action for
105  // defining A<T>::B receives just the inner template parameter list
106  // (and retrieves the outer template parameter list from its
107  // context).
108  bool isSpecialization = true;
109  bool LastParamListWasEmpty = false;
110  TemplateParameterLists ParamLists;
111  TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
112 
113  do {
114  // Consume the 'export', if any.
115  SourceLocation ExportLoc;
116  TryConsumeToken(tok::kw_export, ExportLoc);
117 
118  // Consume the 'template', which should be here.
119  SourceLocation TemplateLoc;
120  if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
121  Diag(Tok.getLocation(), diag::err_expected_template);
122  return nullptr;
123  }
124 
125  // Parse the '<' template-parameter-list '>'
126  SourceLocation LAngleLoc, RAngleLoc;
127  SmallVector<NamedDecl*, 4> TemplateParams;
128  if (ParseTemplateParameters(TemplateParamScopes,
129  CurTemplateDepthTracker.getDepth(),
130  TemplateParams, LAngleLoc, RAngleLoc)) {
131  // Skip until the semi-colon or a '}'.
132  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
133  TryConsumeToken(tok::semi);
134  return nullptr;
135  }
136 
137  ExprResult OptionalRequiresClauseConstraintER;
138  if (!TemplateParams.empty()) {
139  isSpecialization = false;
140  ++CurTemplateDepthTracker;
141 
142  if (TryConsumeToken(tok::kw_requires)) {
143  OptionalRequiresClauseConstraintER =
146  /*IsTrailingRequiresClause=*/false));
147  if (!OptionalRequiresClauseConstraintER.isUsable()) {
148  // Skip until the semi-colon or a '}'.
149  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
150  TryConsumeToken(tok::semi);
151  return nullptr;
152  }
153  }
154  } else {
155  LastParamListWasEmpty = true;
156  }
157 
158  ParamLists.push_back(Actions.ActOnTemplateParameterList(
159  CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
160  TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
161  } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
162 
163  // Parse the actual template declaration.
164  if (Tok.is(tok::kw_concept))
165  return ParseConceptDefinition(
166  ParsedTemplateInfo(&ParamLists, isSpecialization,
167  LastParamListWasEmpty),
168  DeclEnd);
169 
170  return ParseSingleDeclarationAfterTemplate(
171  Context,
172  ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
173  ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
174 }
175 
176 /// Parse a single declaration that declares a template,
177 /// template specialization, or explicit instantiation of a template.
178 ///
179 /// \param DeclEnd will receive the source location of the last token
180 /// within this declaration.
181 ///
182 /// \param AS the access specifier associated with this
183 /// declaration. Will be AS_none for namespace-scope declarations.
184 ///
185 /// \returns the new declaration.
186 Decl *Parser::ParseSingleDeclarationAfterTemplate(
187  DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
188  ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
189  ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
190  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
191  "Template information required");
192 
193  if (Tok.is(tok::kw_static_assert)) {
194  // A static_assert declaration may not be templated.
195  Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
196  << TemplateInfo.getSourceRange();
197  // Parse the static_assert declaration to improve error recovery.
198  return ParseStaticAssertDeclaration(DeclEnd);
199  }
200 
201  if (Context == DeclaratorContext::MemberContext) {
202  // We are parsing a member template.
203  ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
204  &DiagsFromTParams);
205  return nullptr;
206  }
207 
208  ParsedAttributesWithRange prefixAttrs(AttrFactory);
209  MaybeParseCXX11Attributes(prefixAttrs);
210 
211  if (Tok.is(tok::kw_using)) {
212  auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
213  prefixAttrs);
214  if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
215  return nullptr;
216  return usingDeclPtr.get().getSingleDecl();
217  }
218 
219  // Parse the declaration specifiers, stealing any diagnostics from
220  // the template parameters.
221  ParsingDeclSpec DS(*this, &DiagsFromTParams);
222 
223  ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
224  getDeclSpecContextFromDeclaratorContext(Context));
225 
226  if (Tok.is(tok::semi)) {
227  ProhibitAttributes(prefixAttrs);
228  DeclEnd = ConsumeToken();
229  RecordDecl *AnonRecord = nullptr;
231  getCurScope(), AS, DS,
232  TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
234  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
235  AnonRecord);
236  assert(!AnonRecord &&
237  "Anonymous unions/structs should not be valid with template");
238  DS.complete(Decl);
239  return Decl;
240  }
241 
242  // Move the attributes from the prefix into the DS.
243  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
244  ProhibitAttributes(prefixAttrs);
245  else
246  DS.takeAttributesFrom(prefixAttrs);
247 
248  // Parse the declarator.
249  ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
250  if (TemplateInfo.TemplateParams)
251  DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
252  ParseDeclarator(DeclaratorInfo);
253  // Error parsing the declarator?
254  if (!DeclaratorInfo.hasName()) {
255  // If so, skip until the semi-colon or a }.
256  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
257  if (Tok.is(tok::semi))
258  ConsumeToken();
259  return nullptr;
260  }
261 
262  llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
263  return std::string(DeclaratorInfo.getIdentifier() != nullptr
264  ? DeclaratorInfo.getIdentifier()->getName()
265  : "<unknown>");
266  });
267 
268  LateParsedAttrList LateParsedAttrs(true);
269  if (DeclaratorInfo.isFunctionDeclarator()) {
270  if (Tok.is(tok::kw_requires))
271  ParseTrailingRequiresClause(DeclaratorInfo);
272 
273  MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
274  }
275 
276  if (DeclaratorInfo.isFunctionDeclarator() &&
277  isStartOfFunctionDefinition(DeclaratorInfo)) {
278 
279  // Function definitions are only allowed at file scope and in C++ classes.
280  // The C++ inline method definition case is handled elsewhere, so we only
281  // need to handle the file scope definition case.
282  if (Context != DeclaratorContext::FileContext) {
283  Diag(Tok, diag::err_function_definition_not_allowed);
285  return nullptr;
286  }
287 
289  // Recover by ignoring the 'typedef'. This was probably supposed to be
290  // the 'typename' keyword, which we should have already suggested adding
291  // if it's appropriate.
292  Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
295  }
296 
297  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
298  if (DeclaratorInfo.getName().getKind() !=
300  // If the declarator-id is not a template-id, issue a diagnostic and
301  // recover by ignoring the 'template' keyword.
302  Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
303  return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
304  &LateParsedAttrs);
305  } else {
306  SourceLocation LAngleLoc
307  = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
308  Diag(DeclaratorInfo.getIdentifierLoc(),
309  diag::err_explicit_instantiation_with_definition)
310  << SourceRange(TemplateInfo.TemplateLoc)
311  << FixItHint::CreateInsertion(LAngleLoc, "<>");
312 
313  // Recover as if it were an explicit specialization.
314  TemplateParameterLists FakedParamLists;
315  FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
316  0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
317  LAngleLoc, nullptr));
318 
319  return ParseFunctionDefinition(
320  DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
321  /*isSpecialization=*/true,
322  /*lastParameterListWasEmpty=*/true),
323  &LateParsedAttrs);
324  }
325  }
326  return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
327  &LateParsedAttrs);
328  }
329 
330  // Parse this declaration.
331  Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
332  TemplateInfo);
333 
334  if (Tok.is(tok::comma)) {
335  Diag(Tok, diag::err_multiple_template_declarators)
336  << (int)TemplateInfo.Kind;
337  SkipUntil(tok::semi);
338  return ThisDecl;
339  }
340 
341  // Eat the semi colon after the declaration.
342  ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
343  if (LateParsedAttrs.size() > 0)
344  ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
345  DeclaratorInfo.complete(ThisDecl);
346  return ThisDecl;
347 }
348 
349 /// \brief Parse a single declaration that declares a concept.
350 ///
351 /// \param DeclEnd will receive the source location of the last token
352 /// within this declaration.
353 ///
354 /// \returns the new declaration.
355 Decl *
356 Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
357  SourceLocation &DeclEnd) {
358  assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
359  "Template information required");
360  assert(Tok.is(tok::kw_concept) &&
361  "ParseConceptDefinition must be called when at a 'concept' keyword");
362 
363  ConsumeToken(); // Consume 'concept'
364 
365  SourceLocation BoolKWLoc;
366  if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
367  Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
369 
370  DiagnoseAndSkipCXX11Attributes();
371 
372  CXXScopeSpec SS;
373  if (ParseOptionalCXXScopeSpecifier(
374  SS, /*ObjectType=*/nullptr,
375  /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
376  /*MayBePseudoDestructor=*/nullptr,
377  /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
378  SS.isInvalid()) {
379  SkipUntil(tok::semi);
380  return nullptr;
381  }
382 
383  if (SS.isNotEmpty())
384  Diag(SS.getBeginLoc(),
385  diag::err_concept_definition_not_identifier);
386 
388  if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
389  /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
390  /*AllowDestructorName=*/false,
391  /*AllowConstructorName=*/false,
392  /*AllowDeductionGuide=*/false,
393  /*TemplateKWLoc=*/nullptr, Result)) {
394  SkipUntil(tok::semi);
395  return nullptr;
396  }
397 
398  if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
399  Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
400  SkipUntil(tok::semi);
401  return nullptr;
402  }
403 
404  IdentifierInfo *Id = Result.Identifier;
405  SourceLocation IdLoc = Result.getBeginLoc();
406 
407  DiagnoseAndSkipCXX11Attributes();
408 
409  if (!TryConsumeToken(tok::equal)) {
410  Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
411  SkipUntil(tok::semi);
412  return nullptr;
413  }
414 
415  ExprResult ConstraintExprResult =
417  if (ConstraintExprResult.isInvalid()) {
418  SkipUntil(tok::semi);
419  return nullptr;
420  }
421 
422  DeclEnd = Tok.getLocation();
423  ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
424  Expr *ConstraintExpr = ConstraintExprResult.get();
425  return Actions.ActOnConceptDefinition(getCurScope(),
426  *TemplateInfo.TemplateParams,
427  Id, IdLoc, ConstraintExpr);
428 }
429 
430 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
431 /// angle brackets. Depth is the depth of this template-parameter-list, which
432 /// is the number of template headers directly enclosing this template header.
433 /// TemplateParams is the current list of template parameters we're building.
434 /// The template parameter we parse will be added to this list. LAngleLoc and
435 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
436 /// that enclose this template parameter list.
437 ///
438 /// \returns true if an error occurred, false otherwise.
439 bool Parser::ParseTemplateParameters(
440  MultiParseScope &TemplateScopes, unsigned Depth,
441  SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
442  SourceLocation &RAngleLoc) {
443  // Get the template parameter list.
444  if (!TryConsumeToken(tok::less, LAngleLoc)) {
445  Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
446  return true;
447  }
448 
449  // Try to parse the template parameter list.
450  bool Failed = false;
451  // FIXME: Missing greatergreatergreater support.
452  if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
453  TemplateScopes.Enter(Scope::TemplateParamScope);
454  Failed = ParseTemplateParameterList(Depth, TemplateParams);
455  }
456 
457  if (Tok.is(tok::greatergreater)) {
458  // No diagnostic required here: a template-parameter-list can only be
459  // followed by a declaration or, for a template template parameter, the
460  // 'class' keyword. Therefore, the second '>' will be diagnosed later.
461  // This matters for elegant diagnosis of:
462  // template<template<typename>> struct S;
463  Tok.setKind(tok::greater);
464  RAngleLoc = Tok.getLocation();
466  } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
467  Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
468  return true;
469  }
470  return false;
471 }
472 
473 /// ParseTemplateParameterList - Parse a template parameter list. If
474 /// the parsing fails badly (i.e., closing bracket was left out), this
475 /// will try to put the token stream in a reasonable position (closing
476 /// a statement, etc.) and return false.
477 ///
478 /// template-parameter-list: [C++ temp]
479 /// template-parameter
480 /// template-parameter-list ',' template-parameter
481 bool
482 Parser::ParseTemplateParameterList(const unsigned Depth,
483  SmallVectorImpl<NamedDecl*> &TemplateParams) {
484  while (1) {
485 
486  if (NamedDecl *TmpParam
487  = ParseTemplateParameter(Depth, TemplateParams.size())) {
488  TemplateParams.push_back(TmpParam);
489  } else {
490  // If we failed to parse a template parameter, skip until we find
491  // a comma or closing brace.
492  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
494  }
495 
496  // Did we find a comma or the end of the template parameter list?
497  if (Tok.is(tok::comma)) {
498  ConsumeToken();
499  } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
500  // Don't consume this... that's done by template parser.
501  break;
502  } else {
503  // Somebody probably forgot to close the template. Skip ahead and
504  // try to get out of the expression. This error is currently
505  // subsumed by whatever goes on in ParseTemplateParameter.
506  Diag(Tok.getLocation(), diag::err_expected_comma_greater);
507  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
509  return false;
510  }
511  }
512  return true;
513 }
514 
515 /// Determine whether the parser is at the start of a template
516 /// type parameter.
517 Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
518  if (Tok.is(tok::kw_class)) {
519  // "class" may be the start of an elaborated-type-specifier or a
520  // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
521  switch (NextToken().getKind()) {
522  case tok::equal:
523  case tok::comma:
524  case tok::greater:
525  case tok::greatergreater:
526  case tok::ellipsis:
527  return TPResult::True;
528 
529  case tok::identifier:
530  // This may be either a type-parameter or an elaborated-type-specifier.
531  // We have to look further.
532  break;
533 
534  default:
535  return TPResult::False;
536  }
537 
538  switch (GetLookAheadToken(2).getKind()) {
539  case tok::equal:
540  case tok::comma:
541  case tok::greater:
542  case tok::greatergreater:
543  return TPResult::True;
544 
545  default:
546  return TPResult::False;
547  }
548  }
549 
550  if (TryAnnotateTypeConstraint())
551  return TPResult::Error;
552 
553  if (isTypeConstraintAnnotation() &&
554  // Next token might be 'auto' or 'decltype', indicating that this
555  // type-constraint is in fact part of a placeholder-type-specifier of a
556  // non-type template parameter.
557  !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
558  .isOneOf(tok::kw_auto, tok::kw_decltype))
559  return TPResult::True;
560 
561  // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
562  // ill-formed otherwise.
563  if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
564  return TPResult::False;
565 
566  // C++ [temp.param]p2:
567  // There is no semantic difference between class and typename in a
568  // template-parameter. typename followed by an unqualified-id
569  // names a template type parameter. typename followed by a
570  // qualified-id denotes the type in a non-type
571  // parameter-declaration.
572  Token Next = NextToken();
573 
574  // If we have an identifier, skip over it.
575  if (Next.getKind() == tok::identifier)
576  Next = GetLookAheadToken(2);
577 
578  switch (Next.getKind()) {
579  case tok::equal:
580  case tok::comma:
581  case tok::greater:
582  case tok::greatergreater:
583  case tok::ellipsis:
584  return TPResult::True;
585 
586  case tok::kw_typename:
587  case tok::kw_typedef:
588  case tok::kw_class:
589  // These indicate that a comma was missed after a type parameter, not that
590  // we have found a non-type parameter.
591  return TPResult::True;
592 
593  default:
594  return TPResult::False;
595  }
596 }
597 
598 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
599 ///
600 /// template-parameter: [C++ temp.param]
601 /// type-parameter
602 /// parameter-declaration
603 ///
604 /// type-parameter: (See below)
605 /// type-parameter-key ...[opt] identifier[opt]
606 /// type-parameter-key identifier[opt] = type-id
607 /// (C++2a) type-constraint ...[opt] identifier[opt]
608 /// (C++2a) type-constraint identifier[opt] = type-id
609 /// 'template' '<' template-parameter-list '>' type-parameter-key
610 /// ...[opt] identifier[opt]
611 /// 'template' '<' template-parameter-list '>' type-parameter-key
612 /// identifier[opt] '=' id-expression
613 ///
614 /// type-parameter-key:
615 /// class
616 /// typename
617 ///
618 NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
619 
620  switch (isStartOfTemplateTypeParameter()) {
621  case TPResult::True:
622  // Is there just a typo in the input code? ('typedef' instead of
623  // 'typename')
624  if (Tok.is(tok::kw_typedef)) {
625  Diag(Tok.getLocation(), diag::err_expected_template_parameter);
626 
627  Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
629  Tok.getLocation(),
630  Tok.getEndLoc()),
631  "typename");
632 
633  Tok.setKind(tok::kw_typename);
634  }
635 
636  return ParseTypeParameter(Depth, Position);
637  case TPResult::False:
638  break;
639 
640  case TPResult::Error: {
641  // We return an invalid parameter as opposed to null to avoid having bogus
642  // diagnostics about an empty template parameter list.
643  // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
644  // from here.
645  // Return a NTTP as if there was an error in a scope specifier, the user
646  // probably meant to write the type of a NTTP.
647  DeclSpec DS(getAttrFactory());
648  DS.SetTypeSpecError();
650  D.SetIdentifier(nullptr, Tok.getLocation());
651  D.setInvalidType(true);
652  NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
653  getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
654  /*DefaultArg=*/nullptr);
655  ErrorParam->setInvalidDecl(true);
656  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
658  return ErrorParam;
659  }
660 
661  case TPResult::Ambiguous:
662  llvm_unreachable("template param classification can't be ambiguous");
663  }
664 
665  if (Tok.is(tok::kw_template))
666  return ParseTemplateTemplateParameter(Depth, Position);
667 
668  // If it's none of the above, then it must be a parameter declaration.
669  // NOTE: This will pick up errors in the closure of the template parameter
670  // list (e.g., template < ; Check here to implement >> style closures.
671  return ParseNonTypeTemplateParameter(Depth, Position);
672 }
673 
674 /// Check whether the current token is a template-id annotation denoting a
675 /// type-constraint.
676 bool Parser::isTypeConstraintAnnotation() {
677  const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
678  if (T.isNot(tok::annot_template_id))
679  return false;
680  const auto *ExistingAnnot =
681  static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
682  return ExistingAnnot->Kind == TNK_Concept_template;
683 }
684 
685 /// Try parsing a type-constraint at the current location.
686 ///
687 /// type-constraint:
688 /// nested-name-specifier[opt] concept-name
689 /// nested-name-specifier[opt] concept-name
690 /// '<' template-argument-list[opt] '>'[opt]
691 ///
692 /// \returns true if an error occurred, and false otherwise.
693 bool Parser::TryAnnotateTypeConstraint() {
694  if (!getLangOpts().CPlusPlus20)
695  return false;
696  CXXScopeSpec SS;
697  bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
698  if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
699  /*ObjectHadErrors=*/false,
700  /*EnteringContext=*/false,
701  /*MayBePseudoDestructor=*/nullptr,
702  // If this is not a type-constraint, then
703  // this scope-spec is part of the typename
704  // of a non-type template parameter
705  /*IsTypename=*/true, /*LastII=*/nullptr,
706  // We won't find concepts in
707  // non-namespaces anyway, so might as well
708  // parse this correctly for possible type
709  // names.
710  /*OnlyNamespace=*/false))
711  return true;
712 
713  if (Tok.is(tok::identifier)) {
714  UnqualifiedId PossibleConceptName;
715  PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
716  Tok.getLocation());
717 
718  TemplateTy PossibleConcept;
719  bool MemberOfUnknownSpecialization = false;
720  auto TNK = Actions.isTemplateName(getCurScope(), SS,
721  /*hasTemplateKeyword=*/false,
722  PossibleConceptName,
723  /*ObjectType=*/ParsedType(),
724  /*EnteringContext=*/false,
725  PossibleConcept,
726  MemberOfUnknownSpecialization,
727  /*Disambiguation=*/true);
728  if (MemberOfUnknownSpecialization || !PossibleConcept ||
729  TNK != TNK_Concept_template) {
730  if (SS.isNotEmpty())
731  AnnotateScopeToken(SS, !WasScopeAnnotation);
732  return false;
733  }
734 
735  // At this point we're sure we're dealing with a constrained parameter. It
736  // may or may not have a template parameter list following the concept
737  // name.
738  if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
739  /*TemplateKWLoc=*/SourceLocation(),
740  PossibleConceptName,
741  /*AllowTypeAnnotation=*/false,
742  /*TypeConstraint=*/true))
743  return true;
744  }
745 
746  if (SS.isNotEmpty())
747  AnnotateScopeToken(SS, !WasScopeAnnotation);
748  return false;
749 }
750 
751 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
752 /// Other kinds of template parameters are parsed in
753 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
754 ///
755 /// type-parameter: [C++ temp.param]
756 /// 'class' ...[opt][C++0x] identifier[opt]
757 /// 'class' identifier[opt] '=' type-id
758 /// 'typename' ...[opt][C++0x] identifier[opt]
759 /// 'typename' identifier[opt] '=' type-id
760 NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
761  assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||
762  isTypeConstraintAnnotation()) &&
763  "A type-parameter starts with 'class', 'typename' or a "
764  "type-constraint");
765 
766  CXXScopeSpec TypeConstraintSS;
768  bool TypenameKeyword = false;
769  SourceLocation KeyLoc;
770  ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
771  /*ObjectHadErrors=*/false,
772  /*EnteringContext*/ false);
773  if (Tok.is(tok::annot_template_id)) {
774  // Consume the 'type-constraint'.
775  TypeConstraint =
776  static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
777  assert(TypeConstraint->Kind == TNK_Concept_template &&
778  "stray non-concept template-id annotation");
779  KeyLoc = ConsumeAnnotationToken();
780  } else {
781  assert(TypeConstraintSS.isEmpty() &&
782  "expected type constraint after scope specifier");
783 
784  // Consume the 'class' or 'typename' keyword.
785  TypenameKeyword = Tok.is(tok::kw_typename);
786  KeyLoc = ConsumeToken();
787  }
788 
789  // Grab the ellipsis (if given).
790  SourceLocation EllipsisLoc;
791  if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
792  Diag(EllipsisLoc,
794  ? diag::warn_cxx98_compat_variadic_templates
795  : diag::ext_variadic_templates);
796  }
797 
798  // Grab the template parameter name (if given)
799  SourceLocation NameLoc = Tok.getLocation();
800  IdentifierInfo *ParamName = nullptr;
801  if (Tok.is(tok::identifier)) {
802  ParamName = Tok.getIdentifierInfo();
803  ConsumeToken();
804  } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
805  tok::greatergreater)) {
806  // Unnamed template parameter. Don't have to do anything here, just
807  // don't consume this token.
808  } else {
809  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
810  return nullptr;
811  }
812 
813  // Recover from misplaced ellipsis.
814  bool AlreadyHasEllipsis = EllipsisLoc.isValid();
815  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
816  DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
817 
818  // Grab a default argument (if available).
819  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
820  // we introduce the type parameter into the local scope.
821  SourceLocation EqualLoc;
822  ParsedType DefaultArg;
823  if (TryConsumeToken(tok::equal, EqualLoc))
824  DefaultArg = ParseTypeName(/*Range=*/nullptr,
826  .get();
827 
828  NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
829  TypenameKeyword, EllipsisLoc,
830  KeyLoc, ParamName, NameLoc,
831  Depth, Position, EqualLoc,
832  DefaultArg,
833  TypeConstraint != nullptr);
834 
835  if (TypeConstraint) {
836  Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
837  cast<TemplateTypeParmDecl>(NewDecl),
838  EllipsisLoc);
839  }
840 
841  return NewDecl;
842 }
843 
844 /// ParseTemplateTemplateParameter - Handle the parsing of template
845 /// template parameters.
846 ///
847 /// type-parameter: [C++ temp.param]
848 /// 'template' '<' template-parameter-list '>' type-parameter-key
849 /// ...[opt] identifier[opt]
850 /// 'template' '<' template-parameter-list '>' type-parameter-key
851 /// identifier[opt] = id-expression
852 /// type-parameter-key:
853 /// 'class'
854 /// 'typename' [C++1z]
855 NamedDecl *
856 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
857  assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
858 
859  // Handle the template <...> part.
860  SourceLocation TemplateLoc = ConsumeToken();
861  SmallVector<NamedDecl*,8> TemplateParams;
862  SourceLocation LAngleLoc, RAngleLoc;
863  {
864  MultiParseScope TemplateParmScope(*this);
865  if (ParseTemplateParameters(TemplateParmScope, Depth + 1, TemplateParams,
866  LAngleLoc, RAngleLoc)) {
867  return nullptr;
868  }
869  }
870 
871  // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
872  // Generate a meaningful error if the user forgot to put class before the
873  // identifier, comma, or greater. Provide a fixit if the identifier, comma,
874  // or greater appear immediately or after 'struct'. In the latter case,
875  // replace the keyword with 'class'.
876  if (!TryConsumeToken(tok::kw_class)) {
877  bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
878  const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
879  if (Tok.is(tok::kw_typename)) {
880  Diag(Tok.getLocation(),
881  getLangOpts().CPlusPlus17
882  ? diag::warn_cxx14_compat_template_template_param_typename
883  : diag::ext_template_template_param_typename)
884  << (!getLangOpts().CPlusPlus17
885  ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
886  : FixItHint());
887  } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
888  tok::greatergreater, tok::ellipsis)) {
889  Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
890  << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
891  : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
892  } else
893  Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
894 
895  if (Replace)
896  ConsumeToken();
897  }
898 
899  // Parse the ellipsis, if given.
900  SourceLocation EllipsisLoc;
901  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
902  Diag(EllipsisLoc,
904  ? diag::warn_cxx98_compat_variadic_templates
905  : diag::ext_variadic_templates);
906 
907  // Get the identifier, if given.
908  SourceLocation NameLoc = Tok.getLocation();
909  IdentifierInfo *ParamName = nullptr;
910  if (Tok.is(tok::identifier)) {
911  ParamName = Tok.getIdentifierInfo();
912  ConsumeToken();
913  } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
914  tok::greatergreater)) {
915  // Unnamed template parameter. Don't have to do anything here, just
916  // don't consume this token.
917  } else {
918  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
919  return nullptr;
920  }
921 
922  // Recover from misplaced ellipsis.
923  bool AlreadyHasEllipsis = EllipsisLoc.isValid();
924  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
925  DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
926 
927  TemplateParameterList *ParamList =
929  TemplateLoc, LAngleLoc,
930  TemplateParams,
931  RAngleLoc, nullptr);
932 
933  // Grab a default argument (if available).
934  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
935  // we introduce the template parameter into the local scope.
936  SourceLocation EqualLoc;
937  ParsedTemplateArgument DefaultArg;
938  if (TryConsumeToken(tok::equal, EqualLoc)) {
939  DefaultArg = ParseTemplateTemplateArgument();
940  if (DefaultArg.isInvalid()) {
941  Diag(Tok.getLocation(),
942  diag::err_default_template_template_parameter_not_template);
943  SkipUntil(tok::comma, tok::greater, tok::greatergreater,
945  }
946  }
947 
948  return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
949  ParamList, EllipsisLoc,
950  ParamName, NameLoc, Depth,
951  Position, EqualLoc, DefaultArg);
952 }
953 
954 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
955 /// template parameters (e.g., in "template<int Size> class array;").
956 ///
957 /// template-parameter:
958 /// ...
959 /// parameter-declaration
960 NamedDecl *
961 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
962  // Parse the declaration-specifiers (i.e., the type).
963  // FIXME: The type should probably be restricted in some way... Not all
964  // declarators (parts of declarators?) are accepted for parameters.
965  DeclSpec DS(AttrFactory);
966  ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
967  DeclSpecContext::DSC_template_param);
968 
969  // Parse this as a typename.
971  ParseDeclarator(ParamDecl);
973  Diag(Tok.getLocation(), diag::err_expected_template_parameter);
974  return nullptr;
975  }
976 
977  // Recover from misplaced ellipsis.
978  SourceLocation EllipsisLoc;
979  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
980  DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
981 
982  // If there is a default value, parse it.
983  // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
984  // we introduce the template parameter into the local scope.
985  SourceLocation EqualLoc;
986  ExprResult DefaultArg;
987  if (TryConsumeToken(tok::equal, EqualLoc)) {
988  // C++ [temp.param]p15:
989  // When parsing a default template-argument for a non-type
990  // template-parameter, the first non-nested > is taken as the
991  // end of the template-parameter-list rather than a greater-than
992  // operator.
993  GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
994  EnterExpressionEvaluationContext ConstantEvaluated(
996 
998  if (DefaultArg.isInvalid())
999  SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1000  }
1001 
1002  // Create the parameter.
1003  return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
1004  Depth, Position, EqualLoc,
1005  DefaultArg.get());
1006 }
1007 
1008 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
1009  SourceLocation CorrectLoc,
1010  bool AlreadyHasEllipsis,
1011  bool IdentifierHasName) {
1012  FixItHint Insertion;
1013  if (!AlreadyHasEllipsis)
1014  Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
1015  Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
1016  << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
1017  << !IdentifierHasName;
1018 }
1019 
1020 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
1021  Declarator &D) {
1022  assert(EllipsisLoc.isValid());
1023  bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
1024  if (!AlreadyHasEllipsis)
1025  D.setEllipsisLoc(EllipsisLoc);
1026  DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
1027  AlreadyHasEllipsis, D.hasName());
1028 }
1029 
1030 /// Parses a '>' at the end of a template list.
1031 ///
1032 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
1033 /// to determine if these tokens were supposed to be a '>' followed by
1034 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
1035 ///
1036 /// \param RAngleLoc the location of the consumed '>'.
1037 ///
1038 /// \param ConsumeLastToken if true, the '>' is consumed.
1039 ///
1040 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
1041 /// type parameter or type argument list, rather than a C++ template parameter
1042 /// or argument list.
1043 ///
1044 /// \returns true, if current token does not start with '>', false otherwise.
1045 bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
1046  SourceLocation &RAngleLoc,
1047  bool ConsumeLastToken,
1048  bool ObjCGenericList) {
1049  // What will be left once we've consumed the '>'.
1050  tok::TokenKind RemainingToken;
1051  const char *ReplacementStr = "> >";
1052  bool MergeWithNextToken = false;
1053 
1054  switch (Tok.getKind()) {
1055  default:
1056  Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
1057  Diag(LAngleLoc, diag::note_matching) << tok::less;
1058  return true;
1059 
1060  case tok::greater:
1061  // Determine the location of the '>' token. Only consume this token
1062  // if the caller asked us to.
1063  RAngleLoc = Tok.getLocation();
1064  if (ConsumeLastToken)
1065  ConsumeToken();
1066  return false;
1067 
1068  case tok::greatergreater:
1069  RemainingToken = tok::greater;
1070  break;
1071 
1072  case tok::greatergreatergreater:
1073  RemainingToken = tok::greatergreater;
1074  break;
1075 
1076  case tok::greaterequal:
1077  RemainingToken = tok::equal;
1078  ReplacementStr = "> =";
1079 
1080  // Join two adjacent '=' tokens into one, for cases like:
1081  // void (*p)() = f<int>;
1082  // return f<int>==p;
1083  if (NextToken().is(tok::equal) &&
1084  areTokensAdjacent(Tok, NextToken())) {
1085  RemainingToken = tok::equalequal;
1086  MergeWithNextToken = true;
1087  }
1088  break;
1089 
1090  case tok::greatergreaterequal:
1091  RemainingToken = tok::greaterequal;
1092  break;
1093  }
1094 
1095  // This template-id is terminated by a token that starts with a '>'.
1096  // Outside C++11 and Objective-C, this is now error recovery.
1097  //
1098  // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
1099  // extend that treatment to also apply to the '>>>' token.
1100  //
1101  // Objective-C allows this in its type parameter / argument lists.
1102 
1103  SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
1104  SourceLocation TokLoc = Tok.getLocation();
1105  Token Next = NextToken();
1106 
1107  // Whether splitting the current token after the '>' would undesirably result
1108  // in the remaining token pasting with the token after it. This excludes the
1109  // MergeWithNextToken cases, which we've already handled.
1110  bool PreventMergeWithNextToken =
1111  (RemainingToken == tok::greater ||
1112  RemainingToken == tok::greatergreater) &&
1113  (Next.isOneOf(tok::greater, tok::greatergreater,
1114  tok::greatergreatergreater, tok::equal, tok::greaterequal,
1115  tok::greatergreaterequal, tok::equalequal)) &&
1116  areTokensAdjacent(Tok, Next);
1117 
1118  // Diagnose this situation as appropriate.
1119  if (!ObjCGenericList) {
1120  // The source range of the replaced token(s).
1122  TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
1123  getLangOpts()));
1124 
1125  // A hint to put a space between the '>>'s. In order to make the hint as
1126  // clear as possible, we include the characters either side of the space in
1127  // the replacement, rather than just inserting a space at SecondCharLoc.
1128  FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
1129  ReplacementStr);
1130 
1131  // A hint to put another space after the token, if it would otherwise be
1132  // lexed differently.
1133  FixItHint Hint2;
1134  if (PreventMergeWithNextToken)
1135  Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
1136 
1137  unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
1138  if (getLangOpts().CPlusPlus11 &&
1139  (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
1140  DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
1141  else if (Tok.is(tok::greaterequal))
1142  DiagId = diag::err_right_angle_bracket_equal_needs_space;
1143  Diag(TokLoc, DiagId) << Hint1 << Hint2;
1144  }
1145 
1146  // Find the "length" of the resulting '>' token. This is not always 1, as it
1147  // can contain escaped newlines.
1148  unsigned GreaterLength = Lexer::getTokenPrefixLength(
1149  TokLoc, 1, PP.getSourceManager(), getLangOpts());
1150 
1151  // Annotate the source buffer to indicate that we split the token after the
1152  // '>'. This allows us to properly find the end of, and extract the spelling
1153  // of, the '>' token later.
1154  RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
1155 
1156  // Strip the initial '>' from the token.
1157  bool CachingTokens = PP.IsPreviousCachedToken(Tok);
1158 
1159  Token Greater = Tok;
1160  Greater.setLocation(RAngleLoc);
1161  Greater.setKind(tok::greater);
1162  Greater.setLength(GreaterLength);
1163 
1164  unsigned OldLength = Tok.getLength();
1165  if (MergeWithNextToken) {
1166  ConsumeToken();
1167  OldLength += Tok.getLength();
1168  }
1169 
1170  Tok.setKind(RemainingToken);
1171  Tok.setLength(OldLength - GreaterLength);
1172 
1173  // Split the second token if lexing it normally would lex a different token
1174  // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
1175  SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
1176  if (PreventMergeWithNextToken)
1177  AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
1178  Tok.setLocation(AfterGreaterLoc);
1179 
1180  // Update the token cache to match what we just did if necessary.
1181  if (CachingTokens) {
1182  // If the previous cached token is being merged, delete it.
1183  if (MergeWithNextToken)
1185 
1186  if (ConsumeLastToken)
1188  else
1189  PP.ReplacePreviousCachedToken({Greater});
1190  }
1191 
1192  if (ConsumeLastToken) {
1193  PrevTokLocation = RAngleLoc;
1194  } else {
1195  PrevTokLocation = TokBeforeGreaterLoc;
1196  PP.EnterToken(Tok, /*IsReinject=*/true);
1197  Tok = Greater;
1198  }
1199 
1200  return false;
1201 }
1202 
1203 
1204 /// Parses a template-id that after the template name has
1205 /// already been parsed.
1206 ///
1207 /// This routine takes care of parsing the enclosed template argument
1208 /// list ('<' template-parameter-list [opt] '>') and placing the
1209 /// results into a form that can be transferred to semantic analysis.
1210 ///
1211 /// \param ConsumeLastToken if true, then we will consume the last
1212 /// token that forms the template-id. Otherwise, we will leave the
1213 /// last token in the stream (e.g., so that it can be replaced with an
1214 /// annotation token).
1215 bool
1216 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
1217  SourceLocation &LAngleLoc,
1218  TemplateArgList &TemplateArgs,
1219  SourceLocation &RAngleLoc) {
1220  assert(Tok.is(tok::less) && "Must have already parsed the template-name");
1221 
1222  // Consume the '<'.
1223  LAngleLoc = ConsumeToken();
1224 
1225  // Parse the optional template-argument-list.
1226  bool Invalid = false;
1227  {
1228  GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
1229  if (!Tok.isOneOf(tok::greater, tok::greatergreater,
1230  tok::greatergreatergreater, tok::greaterequal,
1231  tok::greatergreaterequal))
1232  Invalid = ParseTemplateArgumentList(TemplateArgs);
1233 
1234  if (Invalid) {
1235  // Try to find the closing '>'.
1236  if (getLangOpts().CPlusPlus11)
1237  SkipUntil(tok::greater, tok::greatergreater,
1238  tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
1239  else
1240  SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
1241  }
1242  }
1243 
1244  return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
1245  /*ObjCGenericList=*/false) ||
1246  Invalid;
1247 }
1248 
1249 /// Replace the tokens that form a simple-template-id with an
1250 /// annotation token containing the complete template-id.
1251 ///
1252 /// The first token in the stream must be the name of a template that
1253 /// is followed by a '<'. This routine will parse the complete
1254 /// simple-template-id and replace the tokens with a single annotation
1255 /// token with one of two different kinds: if the template-id names a
1256 /// type (and \p AllowTypeAnnotation is true), the annotation token is
1257 /// a type annotation that includes the optional nested-name-specifier
1258 /// (\p SS). Otherwise, the annotation token is a template-id
1259 /// annotation that does not include the optional
1260 /// nested-name-specifier.
1261 ///
1262 /// \param Template the declaration of the template named by the first
1263 /// token (an identifier), as returned from \c Action::isTemplateName().
1264 ///
1265 /// \param TNK the kind of template that \p Template
1266 /// refers to, as returned from \c Action::isTemplateName().
1267 ///
1268 /// \param SS if non-NULL, the nested-name-specifier that precedes
1269 /// this template name.
1270 ///
1271 /// \param TemplateKWLoc if valid, specifies that this template-id
1272 /// annotation was preceded by the 'template' keyword and gives the
1273 /// location of that keyword. If invalid (the default), then this
1274 /// template-id was not preceded by a 'template' keyword.
1275 ///
1276 /// \param AllowTypeAnnotation if true (the default), then a
1277 /// simple-template-id that refers to a class template, template
1278 /// template parameter, or other template that produces a type will be
1279 /// replaced with a type annotation token. Otherwise, the
1280 /// simple-template-id is always replaced with a template-id
1281 /// annotation token.
1282 ///
1283 /// \param TypeConstraint if true, then this is actually a type-constraint,
1284 /// meaning that the template argument list can be omitted (and the template in
1285 /// question must be a concept).
1286 ///
1287 /// If an unrecoverable parse error occurs and no annotation token can be
1288 /// formed, this function returns true.
1289 ///
1290 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
1291  CXXScopeSpec &SS,
1292  SourceLocation TemplateKWLoc,
1294  bool AllowTypeAnnotation,
1295  bool TypeConstraint) {
1296  assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
1297  assert((Tok.is(tok::less) || TypeConstraint) &&
1298  "Parser isn't at the beginning of a template-id");
1299  assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "
1300  "a type annotation");
1301  assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "
1302  "must accompany a concept name");
1303  assert((Template || TNK == TNK_Non_template) && "missing template name");
1304 
1305  // Consume the template-name.
1306  SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
1307 
1308  // Parse the enclosed template argument list.
1309  SourceLocation LAngleLoc, RAngleLoc;
1310  TemplateArgList TemplateArgs;
1311  bool ArgsInvalid = false;
1312  if (!TypeConstraint || Tok.is(tok::less)) {
1313  ArgsInvalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
1314  TemplateArgs, RAngleLoc);
1315  // If we couldn't recover from invalid arguments, don't form an annotation
1316  // token -- we don't know how much to annotate.
1317  // FIXME: This can lead to duplicate diagnostics if we retry parsing this
1318  // template-id in another context. Try to annotate anyway?
1319  if (RAngleLoc.isInvalid())
1320  return true;
1321  }
1322 
1323  ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
1324 
1325  // Build the annotation token.
1326  if (TNK == TNK_Type_template && AllowTypeAnnotation) {
1327  TypeResult Type = ArgsInvalid
1328  ? TypeError()
1329  : Actions.ActOnTemplateIdType(
1330  getCurScope(), SS, TemplateKWLoc, Template,
1331  TemplateName.Identifier, TemplateNameLoc,
1332  LAngleLoc, TemplateArgsPtr, RAngleLoc);
1333 
1334  Tok.setKind(tok::annot_typename);
1335  setTypeAnnotation(Tok, Type);
1336  if (SS.isNotEmpty())
1337  Tok.setLocation(SS.getBeginLoc());
1338  else if (TemplateKWLoc.isValid())
1339  Tok.setLocation(TemplateKWLoc);
1340  else
1341  Tok.setLocation(TemplateNameLoc);
1342  } else {
1343  // Build a template-id annotation token that can be processed
1344  // later.
1345  Tok.setKind(tok::annot_template_id);
1346 
1347  IdentifierInfo *TemplateII =
1348  TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1349  ? TemplateName.Identifier
1350  : nullptr;
1351 
1352  OverloadedOperatorKind OpKind =
1353  TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1354  ? OO_None
1355  : TemplateName.OperatorFunctionId.Operator;
1356 
1358  TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1359  LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
1360 
1361  Tok.setAnnotationValue(TemplateId);
1362  if (TemplateKWLoc.isValid())
1363  Tok.setLocation(TemplateKWLoc);
1364  else
1365  Tok.setLocation(TemplateNameLoc);
1366  }
1367 
1368  // Common fields for the annotation token
1369  Tok.setAnnotationEndLoc(RAngleLoc);
1370 
1371  // In case the tokens were cached, have Preprocessor replace them with the
1372  // annotation token.
1373  PP.AnnotateCachedTokens(Tok);
1374  return false;
1375 }
1376 
1377 /// Replaces a template-id annotation token with a type
1378 /// annotation token.
1379 ///
1380 /// If there was a failure when forming the type from the template-id,
1381 /// a type annotation token will still be created, but will have a
1382 /// NULL type pointer to signify an error.
1383 ///
1384 /// \param SS The scope specifier appearing before the template-id, if any.
1385 ///
1386 /// \param IsClassName Is this template-id appearing in a context where we
1387 /// know it names a class, such as in an elaborated-type-specifier or
1388 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
1389 /// in those contexts.)
1390 void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
1391  bool IsClassName) {
1392  assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1393 
1394  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1395  assert(TemplateId->mightBeType() &&
1396  "Only works for type and dependent templates");
1397 
1398  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1399  TemplateId->NumArgs);
1400 
1401  TypeResult Type =
1402  TemplateId->isInvalid()
1403  ? TypeError()
1404  : Actions.ActOnTemplateIdType(
1405  getCurScope(), SS, TemplateId->TemplateKWLoc,
1406  TemplateId->Template, TemplateId->Name,
1407  TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
1408  TemplateArgsPtr, TemplateId->RAngleLoc,
1409  /*IsCtorOrDtorName*/ false, IsClassName);
1410  // Create the new "type" annotation token.
1411  Tok.setKind(tok::annot_typename);
1412  setTypeAnnotation(Tok, Type);
1413  if (SS.isNotEmpty()) // it was a C++ qualified type name.
1414  Tok.setLocation(SS.getBeginLoc());
1415  // End location stays the same
1416 
1417  // Replace the template-id annotation token, and possible the scope-specifier
1418  // that precedes it, with the typename annotation token.
1419  PP.AnnotateCachedTokens(Tok);
1420 }
1421 
1422 /// Determine whether the given token can end a template argument.
1423 static bool isEndOfTemplateArgument(Token Tok) {
1424  // FIXME: Handle '>>>'.
1425  return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
1426  tok::greatergreatergreater);
1427 }
1428 
1429 /// Parse a C++ template template argument.
1430 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1431  if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1432  !Tok.is(tok::annot_cxxscope))
1433  return ParsedTemplateArgument();
1434 
1435  // C++0x [temp.arg.template]p1:
1436  // A template-argument for a template template-parameter shall be the name
1437  // of a class template or an alias template, expressed as id-expression.
1438  //
1439  // We parse an id-expression that refers to a class template or alias
1440  // template. The grammar we parse is:
1441  //
1442  // nested-name-specifier[opt] template[opt] identifier ...[opt]
1443  //
1444  // followed by a token that terminates a template argument, such as ',',
1445  // '>', or (in some cases) '>>'.
1446  CXXScopeSpec SS; // nested-name-specifier, if present
1447  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1448  /*ObjectHadErrors=*/false,
1449  /*EnteringContext=*/false);
1450 
1452  SourceLocation EllipsisLoc;
1453  if (SS.isSet() && Tok.is(tok::kw_template)) {
1454  // Parse the optional 'template' keyword following the
1455  // nested-name-specifier.
1456  SourceLocation TemplateKWLoc = ConsumeToken();
1457 
1458  if (Tok.is(tok::identifier)) {
1459  // We appear to have a dependent template name.
1460  UnqualifiedId Name;
1461  Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1462  ConsumeToken(); // the identifier
1463 
1464  TryConsumeToken(tok::ellipsis, EllipsisLoc);
1465 
1466  // If the next token signals the end of a template argument, then we have
1467  // a (possibly-dependent) template name that could be a template template
1468  // argument.
1469  TemplateTy Template;
1470  if (isEndOfTemplateArgument(Tok) &&
1471  Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
1472  /*ObjectType=*/nullptr,
1473  /*EnteringContext=*/false, Template))
1474  Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1475  }
1476  } else if (Tok.is(tok::identifier)) {
1477  // We may have a (non-dependent) template name.
1478  TemplateTy Template;
1479  UnqualifiedId Name;
1480  Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1481  ConsumeToken(); // the identifier
1482 
1483  TryConsumeToken(tok::ellipsis, EllipsisLoc);
1484 
1485  if (isEndOfTemplateArgument(Tok)) {
1486  bool MemberOfUnknownSpecialization;
1487  TemplateNameKind TNK = Actions.isTemplateName(
1488  getCurScope(), SS,
1489  /*hasTemplateKeyword=*/false, Name,
1490  /*ObjectType=*/nullptr,
1491  /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1492  if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1493  // We have an id-expression that refers to a class template or
1494  // (C++0x) alias template.
1495  Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1496  }
1497  }
1498  }
1499 
1500  // If this is a pack expansion, build it as such.
1501  if (EllipsisLoc.isValid() && !Result.isInvalid())
1502  Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1503 
1504  return Result;
1505 }
1506 
1507 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1508 ///
1509 /// template-argument: [C++ 14.2]
1510 /// constant-expression
1511 /// type-id
1512 /// id-expression
1513 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1514  // C++ [temp.arg]p2:
1515  // In a template-argument, an ambiguity between a type-id and an
1516  // expression is resolved to a type-id, regardless of the form of
1517  // the corresponding template-parameter.
1518  //
1519  // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1520  // up and annotate an identifier as an id-expression during disambiguation,
1521  // so enter the appropriate context for a constant expression template
1522  // argument before trying to disambiguate.
1523 
1524  EnterExpressionEvaluationContext EnterConstantEvaluated(
1526  /*LambdaContextDecl=*/nullptr,
1528  if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1529  TypeResult TypeArg = ParseTypeName(
1530  /*Range=*/nullptr, DeclaratorContext::TemplateArgContext);
1531  return Actions.ActOnTemplateTypeArgument(TypeArg);
1532  }
1533 
1534  // Try to parse a template template argument.
1535  {
1536  TentativeParsingAction TPA(*this);
1537 
1538  ParsedTemplateArgument TemplateTemplateArgument
1539  = ParseTemplateTemplateArgument();
1540  if (!TemplateTemplateArgument.isInvalid()) {
1541  TPA.Commit();
1542  return TemplateTemplateArgument;
1543  }
1544 
1545  // Revert this tentative parse to parse a non-type template argument.
1546  TPA.Revert();
1547  }
1548 
1549  // Parse a non-type template argument.
1550  SourceLocation Loc = Tok.getLocation();
1552  if (ExprArg.isInvalid() || !ExprArg.get()) {
1553  return ParsedTemplateArgument();
1554  }
1555 
1557  ExprArg.get(), Loc);
1558 }
1559 
1560 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1561 /// (C++ [temp.names]). Returns true if there was an error.
1562 ///
1563 /// template-argument-list: [C++ 14.2]
1564 /// template-argument
1565 /// template-argument-list ',' template-argument
1566 bool
1567 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1568 
1569  ColonProtectionRAIIObject ColonProtection(*this, false);
1570 
1571  do {
1572  ParsedTemplateArgument Arg = ParseTemplateArgument();
1573  SourceLocation EllipsisLoc;
1574  if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1575  Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1576 
1577  if (Arg.isInvalid())
1578  return true;
1579 
1580  // Save this template argument.
1581  TemplateArgs.push_back(Arg);
1582 
1583  // If the next token is a comma, consume it and keep reading
1584  // arguments.
1585  } while (TryConsumeToken(tok::comma));
1586 
1587  return false;
1588 }
1589 
1590 /// Parse a C++ explicit template instantiation
1591 /// (C++ [temp.explicit]).
1592 ///
1593 /// explicit-instantiation:
1594 /// 'extern' [opt] 'template' declaration
1595 ///
1596 /// Note that the 'extern' is a GNU extension and C++11 feature.
1597 Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
1598  SourceLocation ExternLoc,
1599  SourceLocation TemplateLoc,
1600  SourceLocation &DeclEnd,
1601  ParsedAttributes &AccessAttrs,
1602  AccessSpecifier AS) {
1603  // This isn't really required here.
1605  ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1606 
1607  return ParseSingleDeclarationAfterTemplate(
1608  Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
1609  ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
1610 }
1611 
1613  if (TemplateParams)
1614  return getTemplateParamsRange(TemplateParams->data(),
1615  TemplateParams->size());
1616 
1617  SourceRange R(TemplateLoc);
1618  if (ExternLoc.isValid())
1619  R.setBegin(ExternLoc);
1620  return R;
1621 }
1622 
1623 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1624  ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1625 }
1626 
1627 /// Late parse a C++ function template in Microsoft mode.
1628 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1629  if (!LPT.D)
1630  return;
1631 
1632  // Destroy TemplateIdAnnotations when we're done, if possible.
1633  DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
1634 
1635  // Get the FunctionDecl.
1636  FunctionDecl *FunD = LPT.D->getAsFunction();
1637  // Track template parameter depth.
1638  TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1639 
1640  // To restore the context after late parsing.
1641  Sema::ContextRAII GlobalSavedContext(
1642  Actions, Actions.Context.getTranslationUnitDecl());
1643 
1644  MultiParseScope Scopes(*this);
1645 
1646  // Get the list of DeclContexts to reenter.
1647  SmallVector<DeclContext*, 4> DeclContextsToReenter;
1648  for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
1649  DC = DC->getLexicalParent())
1650  DeclContextsToReenter.push_back(DC);
1651 
1652  // Reenter scopes from outermost to innermost.
1653  for (DeclContext *DC : reverse(DeclContextsToReenter)) {
1654  CurTemplateDepthTracker.addDepth(
1655  ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
1656  Scopes.Enter(Scope::DeclScope);
1657  // We'll reenter the function context itself below.
1658  if (DC != FunD)
1659  Actions.PushDeclContext(Actions.getCurScope(), DC);
1660  }
1661 
1662  assert(!LPT.Toks.empty() && "Empty body!");
1663 
1664  // Append the current token at the end of the new token stream so that it
1665  // doesn't get lost.
1666  LPT.Toks.push_back(Tok);
1667  PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
1668 
1669  // Consume the previously pushed token.
1670  ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1671  assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1672  "Inline method not starting with '{', ':' or 'try'");
1673 
1674  // Parse the method body. Function body parsing code is similar enough
1675  // to be re-used for method bodies as well.
1676  ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
1678 
1679  // Recreate the containing function DeclContext.
1680  Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
1681 
1682  Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1683 
1684  if (Tok.is(tok::kw_try)) {
1685  ParseFunctionTryBlock(LPT.D, FnScope);
1686  } else {
1687  if (Tok.is(tok::colon))
1688  ParseConstructorInitializer(LPT.D);
1689  else
1690  Actions.ActOnDefaultCtorInitializers(LPT.D);
1691 
1692  if (Tok.is(tok::l_brace)) {
1693  assert((!isa<FunctionTemplateDecl>(LPT.D) ||
1694  cast<FunctionTemplateDecl>(LPT.D)
1695  ->getTemplateParameters()
1696  ->getDepth() == TemplateParameterDepth - 1) &&
1697  "TemplateParameterDepth should be greater than the depth of "
1698  "current template being instantiated!");
1699  ParseFunctionStatementBody(LPT.D, FnScope);
1700  Actions.UnmarkAsLateParsedTemplate(FunD);
1701  } else
1702  Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1703  }
1704 }
1705 
1706 /// Lex a delayed template function for late parsing.
1707 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1708  tok::TokenKind kind = Tok.getKind();
1709  if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1710  // Consume everything up to (and including) the matching right brace.
1711  ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1712  }
1713 
1714  // If we're in a function-try-block, we need to store all the catch blocks.
1715  if (kind == tok::kw_try) {
1716  while (Tok.is(tok::kw_catch)) {
1717  ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1718  ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1719  }
1720  }
1721 }
1722 
1723 /// We've parsed something that could plausibly be intended to be a template
1724 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
1725 /// be an expression. Determine if this is likely to be a template-id and if so,
1726 /// diagnose it.
1727 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
1728  TentativeParsingAction TPA(*this);
1729  // FIXME: We could look at the token sequence in a lot more detail here.
1730  if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
1732  TPA.Commit();
1733 
1735  ParseGreaterThanInTemplateList(Less, Greater, true, false);
1737  Less, Greater);
1738  return true;
1739  }
1740 
1741  // There's no matching '>' token, this probably isn't supposed to be
1742  // interpreted as a template-id. Parse it as an (ill-formed) comparison.
1743  TPA.Revert();
1744  return false;
1745 }
1746 
1747 void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
1748  assert(Tok.is(tok::less) && "not at a potential angle bracket");
1749 
1750  bool DependentTemplateName = false;
1751  if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
1752  DependentTemplateName))
1753  return;
1754 
1755  // OK, this might be a name that the user intended to be parsed as a
1756  // template-name, followed by a '<' token. Check for some easy cases.
1757 
1758  // If we have potential_template<>, then it's supposed to be a template-name.
1759  if (NextToken().is(tok::greater) ||
1760  (getLangOpts().CPlusPlus11 &&
1761  NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
1762  SourceLocation Less = ConsumeToken();
1764  ParseGreaterThanInTemplateList(Less, Greater, true, false);
1766  getCurScope(), PotentialTemplateName, Less, Greater);
1767  // FIXME: Perform error recovery.
1768  PotentialTemplateName = ExprError();
1769  return;
1770  }
1771 
1772  // If we have 'potential_template<type-id', assume it's supposed to be a
1773  // template-name if there's a matching '>' later on.
1774  {
1775  // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
1776  TentativeParsingAction TPA(*this);
1777  SourceLocation Less = ConsumeToken();
1778  if (isTypeIdUnambiguously() &&
1779  diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
1780  TPA.Commit();
1781  // FIXME: Perform error recovery.
1782  PotentialTemplateName = ExprError();
1783  return;
1784  }
1785  TPA.Revert();
1786  }
1787 
1788  // Otherwise, remember that we saw this in case we see a potentially-matching
1789  // '>' token later on.
1791  (DependentTemplateName ? AngleBracketTracker::DependentName
1792  : AngleBracketTracker::PotentialTypo) |
1793  (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
1794  : AngleBracketTracker::NoSpaceBeforeLess);
1795  AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
1796  Priority);
1797 }
1798 
1799 bool Parser::checkPotentialAngleBracketDelimiter(
1800  const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
1801  // If a comma in an expression context is followed by a type that can be a
1802  // template argument and cannot be an expression, then this is ill-formed,
1803  // but might be intended to be part of a template-id.
1804  if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
1805  diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
1806  AngleBrackets.clear(*this);
1807  return true;
1808  }
1809 
1810  // If a context that looks like a template-id is followed by '()', then
1811  // this is ill-formed, but might be intended to be a template-id
1812  // followed by '()'.
1813  if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
1814  NextToken().is(tok::r_paren)) {
1816  getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
1817  OpToken.getLocation());
1818  AngleBrackets.clear(*this);
1819  return true;
1820  }
1821 
1822  // After a '>' (etc), we're no longer potentially in a construct that's
1823  // intended to be treated as a template-id.
1824  if (OpToken.is(tok::greater) ||
1825  (getLangOpts().CPlusPlus11 &&
1826  OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
1827  AngleBrackets.clear(*this);
1828  return false;
1829 }
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:157
static TemplateIdAnnotation * Create(SourceLocation TemplateKWLoc, SourceLocation TemplateNameLoc, IdentifierInfo *Name, OverloadedOperatorKind OperatorKind, ParsedTemplateTy OpaqueTemplateName, TemplateNameKind TemplateKind, SourceLocation LAngleLoc, SourceLocation RAngleLoc, ArrayRef< ParsedTemplateArgument > TemplateArgs, bool ArgsInvalid, SmallVectorImpl< TemplateIdAnnotation *> &CleanupList)
Creates a new TemplateIdAnnotation with NumArgs arguments and appends it to List. ...
Represents a function declaration or definition.
Definition: Decl.h:1783
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
SourceLocation getEndOfPreviousToken()
Definition: Parser.h:524
SourceRange getSourceRange() const LLVM_READONLY
Return the source range that covers this unqualified-id.
Definition: DeclSpec.h:1155
void diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName, SourceLocation Less, SourceLocation Greater)
SourceLocation StartLocation
The location of the first token that describes this unqualified-id, which will be the location of the...
Definition: DeclSpec.h:1013
IdentifierInfo * Identifier
When Kind == IK_Identifier, the parsed identifier, or when Kind == IK_UserLiteralId, the identifier suffix.
Definition: DeclSpec.h:983
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:97
The name refers to a dependent template name:
Definition: TemplateKinds.h:46
bool isEmpty() const
No scope specifier.
Definition: DeclSpec.h:190
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:89
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:1472
This indicates that the scope corresponds to a function, which means that labels are set here...
Definition: Scope.h:47
bool isFunctionDeclarator(unsigned &idx) const
isFunctionDeclarator - This method returns true if the declarator is a function declarator (looking t...
Definition: DeclSpec.h:2281
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:115
TemplateNameKind Kind
The kind of template that Template refers to.
Parser - This implements a parser for the C family of languages.
Definition: Parser.h:61
bool ParseUnqualifiedId(CXXScopeSpec &SS, ParsedType ObjectType, bool ObjectHadErrors, bool EnteringContext, bool AllowDestructorName, bool AllowConstructorName, bool AllowDeductionGuide, SourceLocation *TemplateKWLoc, UnqualifiedId &Result)
Parse a C++ unqualified-id (or a C identifier), which describes the name of an entity.
void SetIdentifier(IdentifierInfo *Id, SourceLocation IdLoc)
Set the name of this declarator to be the given identifier.
Definition: DeclSpec.h:2180
void ActOnDefaultCtorInitializers(Decl *CDtorDecl)
RAII object that enters a new expression evaluation context.
Definition: Sema.h:12557
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1791
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:69
CharSourceRange getSourceRange(const SourceRange &Range)
Returns the token CharSourceRange corresponding to Range.
Definition: FixIt.h:32
friend class ObjCDeclContextSwitch
Definition: Parser.h:66
Defines the clang::Expr interface and subclasses for C++ expressions.
ColonProtectionRAIIObject - This sets the Parser::ColonIsSacred bool and restores it when destroyed...
tok::TokenKind getKind() const
Definition: Token.h:92
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:1181
Information about a template-id annotation token.
Decl * ActOnStartOfFunctionDef(Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParamLists, SkipBodyInfo *SkipBody=nullptr)
Definition: SemaDecl.cpp:13641
Represents a struct/union/class.
Definition: Decl.h:3770
const Token & NextToken()
NextToken - This peeks ahead one token and returns it without consuming it.
Definition: Parser.h:789
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:486
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:449
Introduces zero or more scopes for parsing.
Definition: Parser.h:1096
OverloadedOperatorKind Operator
The kind of overloaded operator.
Definition: DeclSpec.h:966
struct OFI OperatorFunctionId
When Kind == IK_OperatorFunctionId, the overloaded operator that we parsed.
Definition: DeclSpec.h:987
CachedTokens Toks
Definition: Sema.h:12612
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
A non-type template parameter, stored as an expression.
void setKind(tok::TokenKind K)
Definition: Token.h:93
OpaquePtr< QualType > ParsedType
An opaque type for threading parsed type information through the parser.
Definition: Ownership.h:244
void ClearStorageClassSpecs()
Definition: DeclSpec.h:464
ExprResult CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl=nullptr, bool RecoverUncorrectedTypos=false, 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...
void setTemplateParameterLists(ArrayRef< TemplateParameterList *> TPLs)
Sets the template parameter lists that preceded the declarator.
Definition: DeclSpec.h:2456
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:955
PtrTy get() const
Definition: Ownership.h:170
__device__ int
void Enter(unsigned ScopeFlags)
Definition: Parser.h:1104
unsigned ActOnReenterTemplateScope(Decl *Template, llvm::function_ref< Scope *()> EnterScope)
bool IsPreviousCachedToken(const Token &Tok) const
Whether Tok is the most recent token (CachedLexPos - 1) in CachedTokens.
Definition: PPCaching.cpp:139
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:363
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:64
SourceLocation ConsumeAnyToken(bool ConsumeCodeCompletionTok=false)
ConsumeAnyToken - Dispatch to the right Consume* method based on the current token type...
Definition: Parser.h:506
Decl * ActOnFinishFunctionBody(Decl *Decl, Stmt *Body)
Definition: SemaDecl.cpp:14108
AttributeFactory & getAttrFactory()
Definition: Parser.h:437
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
bool mightBeIntendedToBeTemplateName(ExprResult E, bool &Dependent)
Determine whether it&#39;s plausible that E was intended to be a template-name.
Definition: Sema.h:2302
IdentifierInfo * getIdentifier() const
Definition: DeclSpec.h:2171
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclSpec.h:1158
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...
TST getTypeSpecType() const
Definition: DeclSpec.h:482
Scope * getCurScope() const
Retrieve the parser&#39;s current scope.
Definition: Sema.h:12391
DeclContext * getLexicalParent()
getLexicalParent - Returns the containing lexical DeclContext.
Definition: DeclBase.h:1832
void setAnnotationValue(void *val)
Definition: Token.h:230
This represents one expression.
Definition: Expr.h:110
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:4339
Represents a character-granular source range.
int Id
Definition: ASTDiff.cpp:191
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:1774
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
The name refers to a concept.
Definition: TemplateKinds.h:52
OpaquePtr< TemplateName > TemplateTy
Definition: Parser.h:450
static constexpr bool isOneOf()
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file. ...
Definition: Token.h:126
static unsigned getTokenPrefixLength(SourceLocation TokStart, unsigned CharNo, const SourceManager &SM, const LangOptions &LangOpts)
Get the physical length (including trigraphs and escaped newlines) of the first Characters characters...
Definition: Lexer.cpp:719
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:73
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:192
This is a compound statement scope.
Definition: Scope.h:130
SourceLocation getStorageClassSpecLoc() const
Definition: DeclSpec.h:459
int Depth
Definition: ASTDiff.cpp:191
UnqualifiedIdKind getKind() const
Determine what kind of name we have.
Definition: DeclSpec.h:1037
TemplateNameKind
Specifies the kind of template name that an identifier refers to.
Definition: TemplateKinds.h:20
DeclaratorContext
Definition: DeclSpec.h:1748
void setEllipsisLoc(SourceLocation EL)
Definition: DeclSpec.h:2542
bool isInvalid() const
Definition: Ownership.h:166
bool isUsable() const
Definition: Ownership.h:167
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:433
static CharSourceRange getCharRange(SourceRange R)
TemplateNameKind isTemplateName(Scope *S, CXXScopeSpec &SS, bool hasTemplateKeyword, const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext, TemplateTy &Template, bool &MemberOfUnknownSpecialization, bool Disambiguation=false)
SourceManager & getSourceManager() const
Definition: Preprocessor.h:919
A class for parsing a DeclSpec.
Stop skipping at semicolon.
Definition: Parser.h:1160
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
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
SCS getStorageClassSpec() const
Definition: DeclSpec.h:450
bool hasName() const
hasName - Whether this declarator has a name, which might be an identifier (accessible via getIdentif...
Definition: DeclSpec.h:2161
Encodes a location in the source.
void setLength(unsigned Len)
Definition: Token.h:135
UnqualifiedId & getName()
Retrieve the name specified by this declarator.
Definition: DeclSpec.h:1913
IdentifierInfo * getIdentifierInfo() const
Definition: Token.h:179
void setAnnotationEndLoc(SourceLocation L)
Definition: Token.h:144
NamedDecl * ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, unsigned Depth, unsigned Position, SourceLocation EqualLoc, Expr *DefaultArg)
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
void EnterToken(const Token &Tok, bool IsReinject)
Enters a token in the token stream to be lexed next.
Scope * getCurScope() const
Definition: Parser.h:440
ExprResult ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast=NotTypeCast)
Definition: ParseExpr.cpp:201
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:195
void UnmarkAsLateParsedTemplate(FunctionDecl *FD)
TypeResult ActOnTemplateIdType(Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, TemplateTy Template, IdentifierInfo *TemplateII, SourceLocation TemplateIILoc, SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgs, SourceLocation RAngleLoc, bool IsCtorOrDtorName=false, bool IsClassName=false)
StringRef getName() const
Return the actual identifier string.
bool isNot(tok::TokenKind K) const
Definition: Token.h:98
The name does not refer to a template.
Definition: TemplateKinds.h:22
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:1303
OverloadedOperatorKind
Enumeration specifying the different kinds of C++ overloaded operators.
Definition: OperatorKinds.h:21
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:122
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:235
bool isInvalid() const
Determine whether the given template argument is invalid.
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const
Definition: Token.h:99
void PushDeclContext(Scope *S, DeclContext *DC)
Set the current declaration context until it gets popped.
Definition: SemaDecl.cpp:1263
The name refers to a template whose specialization produces a type.
Definition: TemplateKinds.h:30
static const TST TST_unspecified
Definition: DeclSpec.h:273
unsigned getLength() const
Definition: Token.h:129
Not an overloaded operator.
Definition: OperatorKinds.h:22
void takeAttributesFrom(ParsedAttributes &attrs)
Definition: DeclSpec.h:803
DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Definition: Parser.cpp:73
ParsedTemplateArgument ActOnTemplateTypeArgument(TypeResult ParsedType)
Convert a parsed type into a parsed template argument.
bool ActOnTypeConstraint(const CXXScopeSpec &SS, TemplateIdAnnotation *TypeConstraint, TemplateTypeParmDecl *ConstrainedParameter, SourceLocation EllipsisLoc)
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:96
This is a scope that can contain a declaration.
Definition: Scope.h:59
NamedDecl * ActOnTypeParameter(Scope *S, bool Typename, SourceLocation EllipsisLoc, SourceLocation KeyLoc, IdentifierInfo *ParamName, SourceLocation ParamNameLoc, unsigned Depth, unsigned Position, SourceLocation EqualLoc, ParsedType DefaultArg, bool HasTypeConstraint)
ActOnTypeParameter - Called when a C++ template type parameter (e.g., "typename T") has been parsed...
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2177
bool isSet() const
Deprecated.
Definition: DeclSpec.h:210
void setInvalidType(bool Val=true)
Definition: DeclSpec.h:2528
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:935
Captures information about "declaration specifiers".
Definition: DeclSpec.h:229
SourceLocation ConsumeToken()
ConsumeToken - Consume the current &#39;peek token&#39; and lex the next one.
Definition: Parser.h:478
SourceLocation getEllipsisLoc() const
Definition: DeclSpec.h:2541
TypeResult TypeError()
Definition: Ownership.h:281
Decl * D
The template function declaration to be late parsed.
Definition: Sema.h:12614
int Priority
Definition: Format.cpp:2022
TemplateNameKind ActOnTemplateName(Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext, TemplateTy &Template, bool AllowInjectedClassName=false)
Form a template name from a name that is syntactically required to name a template, either due to use of the &#39;template&#39; keyword or because a name in this syntactic context is assumed to name a template (C++ [temp.names]p2-4).
bool isNotEmpty() const
A scope specifier is present, but may be valid or invalid.
Definition: DeclSpec.h:192
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:60
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:133
A template-id, e.g., f<int>.
ExprResult ExprError()
Definition: Ownership.h:279
Contains a late templated function.
Definition: Sema.h:12611
Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:70
unsigned ReenterTemplateScopes(MultiParseScope &S, Decl *D)
Re-enter the template scopes for a declaration that might be a template.
void setLocation(SourceLocation L)
Definition: Token.h:134
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:399
This represents a decl that may have a name.
Definition: Decl.h:223
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc)
Specify that this unqualified-id was parsed as an identifier.
Definition: DeclSpec.h:1044
bool isTranslationUnit() const
Definition: DeclBase.h:1891
bool SetTypeSpecError()
Definition: DeclSpec.cpp:912
Decl * ActOnConceptDefinition(Scope *S, MultiTemplateParamsArg TemplateParameterLists, IdentifierInfo *Name, SourceLocation NameLoc, Expr *ConstraintExpr)
void * getAnnotationValue() const
Definition: Token.h:226
SourceLocation getBegin() const
ParsedAttributes - A collection of parsed attributes.
Definition: ParsedAttr.h:910
bool hasLeadingSpace() const
Return true if this token has whitespace before it.
Definition: Token.h:272
ExprResult ParseConstraintLogicalOrExpression(bool IsTrailingRequiresClause)
Parse a constraint-logical-or-expression.
Definition: ParseExpr.cpp:349
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:42
Stop skipping at specified token, but don&#39;t skip the token itself.
Definition: Parser.h:1162
A RAII object to temporarily push a declaration context.
Definition: Sema.h:873
SourceLocation getEndLoc() const
Definition: Token.h:153