clang  9.0.0svn
ParseDeclCXX.cpp
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1 //===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===//
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 the C++ Declaration portions of the Parser interfaces.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/Parse/Parser.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/DeclTemplate.h"
17 #include "clang/Basic/Attributes.h"
18 #include "clang/Basic/CharInfo.h"
20 #include "clang/Basic/TargetInfo.h"
23 #include "clang/Sema/DeclSpec.h"
25 #include "clang/Sema/Scope.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/Support/TimeProfiler.h"
28 
29 using namespace clang;
30 
31 /// ParseNamespace - We know that the current token is a namespace keyword. This
32 /// may either be a top level namespace or a block-level namespace alias. If
33 /// there was an inline keyword, it has already been parsed.
34 ///
35 /// namespace-definition: [C++: namespace.def]
36 /// named-namespace-definition
37 /// unnamed-namespace-definition
38 /// nested-namespace-definition
39 ///
40 /// named-namespace-definition:
41 /// 'inline'[opt] 'namespace' attributes[opt] identifier '{'
42 /// namespace-body '}'
43 ///
44 /// unnamed-namespace-definition:
45 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
46 ///
47 /// nested-namespace-definition:
48 /// 'namespace' enclosing-namespace-specifier '::' 'inline'[opt]
49 /// identifier '{' namespace-body '}'
50 ///
51 /// enclosing-namespace-specifier:
52 /// identifier
53 /// enclosing-namespace-specifier '::' 'inline'[opt] identifier
54 ///
55 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
56 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
57 ///
58 Parser::DeclGroupPtrTy Parser::ParseNamespace(DeclaratorContext Context,
59  SourceLocation &DeclEnd,
60  SourceLocation InlineLoc) {
61  assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
62  SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
63  ObjCDeclContextSwitch ObjCDC(*this);
64 
65  if (Tok.is(tok::code_completion)) {
67  cutOffParsing();
68  return nullptr;
69  }
70 
71  SourceLocation IdentLoc;
72  IdentifierInfo *Ident = nullptr;
73  InnerNamespaceInfoList ExtraNSs;
74  SourceLocation FirstNestedInlineLoc;
75 
76  ParsedAttributesWithRange attrs(AttrFactory);
77  SourceLocation attrLoc;
78  if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) {
79  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
80  ? diag::warn_cxx14_compat_ns_enum_attribute
81  : diag::ext_ns_enum_attribute)
82  << 0 /*namespace*/;
83  attrLoc = Tok.getLocation();
84  ParseCXX11Attributes(attrs);
85  }
86 
87  if (Tok.is(tok::identifier)) {
88  Ident = Tok.getIdentifierInfo();
89  IdentLoc = ConsumeToken(); // eat the identifier.
90  while (Tok.is(tok::coloncolon) &&
91  (NextToken().is(tok::identifier) ||
92  (NextToken().is(tok::kw_inline) &&
93  GetLookAheadToken(2).is(tok::identifier)))) {
94 
95  InnerNamespaceInfo Info;
96  Info.NamespaceLoc = ConsumeToken();
97 
98  if (Tok.is(tok::kw_inline)) {
99  Info.InlineLoc = ConsumeToken();
100  if (FirstNestedInlineLoc.isInvalid())
101  FirstNestedInlineLoc = Info.InlineLoc;
102  }
103 
104  Info.Ident = Tok.getIdentifierInfo();
105  Info.IdentLoc = ConsumeToken();
106 
107  ExtraNSs.push_back(Info);
108  }
109  }
110 
111  // A nested namespace definition cannot have attributes.
112  if (!ExtraNSs.empty() && attrLoc.isValid())
113  Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute);
114 
115  // Read label attributes, if present.
116  if (Tok.is(tok::kw___attribute)) {
117  attrLoc = Tok.getLocation();
118  ParseGNUAttributes(attrs);
119  }
120 
121  if (Tok.is(tok::equal)) {
122  if (!Ident) {
123  Diag(Tok, diag::err_expected) << tok::identifier;
124  // Skip to end of the definition and eat the ';'.
125  SkipUntil(tok::semi);
126  return nullptr;
127  }
128  if (attrLoc.isValid())
129  Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias);
130  if (InlineLoc.isValid())
131  Diag(InlineLoc, diag::err_inline_namespace_alias)
132  << FixItHint::CreateRemoval(InlineLoc);
133  Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
134  return Actions.ConvertDeclToDeclGroup(NSAlias);
135 }
136 
137  BalancedDelimiterTracker T(*this, tok::l_brace);
138  if (T.consumeOpen()) {
139  if (Ident)
140  Diag(Tok, diag::err_expected) << tok::l_brace;
141  else
142  Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
143  return nullptr;
144  }
145 
146  if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
147  getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
148  getCurScope()->getFnParent()) {
149  Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
150  SkipUntil(tok::r_brace);
151  return nullptr;
152  }
153 
154  if (ExtraNSs.empty()) {
155  // Normal namespace definition, not a nested-namespace-definition.
156  } else if (InlineLoc.isValid()) {
157  Diag(InlineLoc, diag::err_inline_nested_namespace_definition);
158  } else if (getLangOpts().CPlusPlus2a) {
159  Diag(ExtraNSs[0].NamespaceLoc,
160  diag::warn_cxx14_compat_nested_namespace_definition);
161  if (FirstNestedInlineLoc.isValid())
162  Diag(FirstNestedInlineLoc,
163  diag::warn_cxx17_compat_inline_nested_namespace_definition);
164  } else if (getLangOpts().CPlusPlus17) {
165  Diag(ExtraNSs[0].NamespaceLoc,
166  diag::warn_cxx14_compat_nested_namespace_definition);
167  if (FirstNestedInlineLoc.isValid())
168  Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition);
169  } else {
170  TentativeParsingAction TPA(*this);
171  SkipUntil(tok::r_brace, StopBeforeMatch);
172  Token rBraceToken = Tok;
173  TPA.Revert();
174 
175  if (!rBraceToken.is(tok::r_brace)) {
176  Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition)
177  << SourceRange(ExtraNSs.front().NamespaceLoc,
178  ExtraNSs.back().IdentLoc);
179  } else {
180  std::string NamespaceFix;
181  for (const auto &ExtraNS : ExtraNSs) {
182  NamespaceFix += " { ";
183  if (ExtraNS.InlineLoc.isValid())
184  NamespaceFix += "inline ";
185  NamespaceFix += "namespace ";
186  NamespaceFix += ExtraNS.Ident->getName();
187  }
188 
189  std::string RBraces;
190  for (unsigned i = 0, e = ExtraNSs.size(); i != e; ++i)
191  RBraces += "} ";
192 
193  Diag(ExtraNSs[0].NamespaceLoc, diag::ext_nested_namespace_definition)
195  SourceRange(ExtraNSs.front().NamespaceLoc,
196  ExtraNSs.back().IdentLoc),
197  NamespaceFix)
198  << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
199  }
200 
201  // Warn about nested inline namespaces.
202  if (FirstNestedInlineLoc.isValid())
203  Diag(FirstNestedInlineLoc, diag::ext_inline_nested_namespace_definition);
204  }
205 
206  // If we're still good, complain about inline namespaces in non-C++0x now.
207  if (InlineLoc.isValid())
208  Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
209  diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
210 
211  // Enter a scope for the namespace.
212  ParseScope NamespaceScope(this, Scope::DeclScope);
213 
214  UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
215  Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(
216  getCurScope(), InlineLoc, NamespaceLoc, IdentLoc, Ident,
217  T.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl);
218 
219  PrettyDeclStackTraceEntry CrashInfo(Actions.Context, NamespcDecl,
220  NamespaceLoc, "parsing namespace");
221 
222  // Parse the contents of the namespace. This includes parsing recovery on
223  // any improperly nested namespaces.
224  ParseInnerNamespace(ExtraNSs, 0, InlineLoc, attrs, T);
225 
226  // Leave the namespace scope.
227  NamespaceScope.Exit();
228 
229  DeclEnd = T.getCloseLocation();
230  Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
231 
232  return Actions.ConvertDeclToDeclGroup(NamespcDecl,
233  ImplicitUsingDirectiveDecl);
234 }
235 
236 /// ParseInnerNamespace - Parse the contents of a namespace.
237 void Parser::ParseInnerNamespace(const InnerNamespaceInfoList &InnerNSs,
238  unsigned int index, SourceLocation &InlineLoc,
239  ParsedAttributes &attrs,
240  BalancedDelimiterTracker &Tracker) {
241  if (index == InnerNSs.size()) {
242  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
243  Tok.isNot(tok::eof)) {
244  ParsedAttributesWithRange attrs(AttrFactory);
245  MaybeParseCXX11Attributes(attrs);
246  ParseExternalDeclaration(attrs);
247  }
248 
249  // The caller is what called check -- we are simply calling
250  // the close for it.
251  Tracker.consumeClose();
252 
253  return;
254  }
255 
256  // Handle a nested namespace definition.
257  // FIXME: Preserve the source information through to the AST rather than
258  // desugaring it here.
259  ParseScope NamespaceScope(this, Scope::DeclScope);
260  UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
261  Decl *NamespcDecl = Actions.ActOnStartNamespaceDef(
262  getCurScope(), InnerNSs[index].InlineLoc, InnerNSs[index].NamespaceLoc,
263  InnerNSs[index].IdentLoc, InnerNSs[index].Ident,
264  Tracker.getOpenLocation(), attrs, ImplicitUsingDirectiveDecl);
265  assert(!ImplicitUsingDirectiveDecl &&
266  "nested namespace definition cannot define anonymous namespace");
267 
268  ParseInnerNamespace(InnerNSs, ++index, InlineLoc, attrs, Tracker);
269 
270  NamespaceScope.Exit();
271  Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
272 }
273 
274 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
275 /// alias definition.
276 ///
277 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
278  SourceLocation AliasLoc,
279  IdentifierInfo *Alias,
280  SourceLocation &DeclEnd) {
281  assert(Tok.is(tok::equal) && "Not equal token");
282 
283  ConsumeToken(); // eat the '='.
284 
285  if (Tok.is(tok::code_completion)) {
287  cutOffParsing();
288  return nullptr;
289  }
290 
291  CXXScopeSpec SS;
292  // Parse (optional) nested-name-specifier.
293  ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false,
294  /*MayBePseudoDestructor=*/nullptr,
295  /*IsTypename=*/false,
296  /*LastII=*/nullptr,
297  /*OnlyNamespace=*/true);
298 
299  if (Tok.isNot(tok::identifier)) {
300  Diag(Tok, diag::err_expected_namespace_name);
301  // Skip to end of the definition and eat the ';'.
302  SkipUntil(tok::semi);
303  return nullptr;
304  }
305 
306  if (SS.isInvalid()) {
307  // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
308  // Skip to end of the definition and eat the ';'.
309  SkipUntil(tok::semi);
310  return nullptr;
311  }
312 
313  // Parse identifier.
314  IdentifierInfo *Ident = Tok.getIdentifierInfo();
315  SourceLocation IdentLoc = ConsumeToken();
316 
317  // Eat the ';'.
318  DeclEnd = Tok.getLocation();
319  if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name))
320  SkipUntil(tok::semi);
321 
322  return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc,
323  Alias, SS, IdentLoc, Ident);
324 }
325 
326 /// ParseLinkage - We know that the current token is a string_literal
327 /// and just before that, that extern was seen.
328 ///
329 /// linkage-specification: [C++ 7.5p2: dcl.link]
330 /// 'extern' string-literal '{' declaration-seq[opt] '}'
331 /// 'extern' string-literal declaration
332 ///
333 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, DeclaratorContext Context) {
334  assert(isTokenStringLiteral() && "Not a string literal!");
335  ExprResult Lang = ParseStringLiteralExpression(false);
336 
337  ParseScope LinkageScope(this, Scope::DeclScope);
338  Decl *LinkageSpec =
339  Lang.isInvalid()
340  ? nullptr
342  getCurScope(), DS.getSourceRange().getBegin(), Lang.get(),
343  Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
344 
345  ParsedAttributesWithRange attrs(AttrFactory);
346  MaybeParseCXX11Attributes(attrs);
347 
348  if (Tok.isNot(tok::l_brace)) {
349  // Reset the source range in DS, as the leading "extern"
350  // does not really belong to the inner declaration ...
353  // ... but anyway remember that such an "extern" was seen.
354  DS.setExternInLinkageSpec(true);
355  ParseExternalDeclaration(attrs, &DS);
356  return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
357  getCurScope(), LinkageSpec, SourceLocation())
358  : nullptr;
359  }
360 
361  DS.abort();
362 
363  ProhibitAttributes(attrs);
364 
365  BalancedDelimiterTracker T(*this, tok::l_brace);
366  T.consumeOpen();
367 
368  unsigned NestedModules = 0;
369  while (true) {
370  switch (Tok.getKind()) {
371  case tok::annot_module_begin:
372  ++NestedModules;
374  continue;
375 
376  case tok::annot_module_end:
377  if (!NestedModules)
378  break;
379  --NestedModules;
381  continue;
382 
383  case tok::annot_module_include:
385  continue;
386 
387  case tok::eof:
388  break;
389 
390  case tok::r_brace:
391  if (!NestedModules)
392  break;
393  LLVM_FALLTHROUGH;
394  default:
395  ParsedAttributesWithRange attrs(AttrFactory);
396  MaybeParseCXX11Attributes(attrs);
397  ParseExternalDeclaration(attrs);
398  continue;
399  }
400 
401  break;
402  }
403 
404  T.consumeClose();
405  return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
406  getCurScope(), LinkageSpec, T.getCloseLocation())
407  : nullptr;
408 }
409 
410 /// Parse a C++ Modules TS export-declaration.
411 ///
412 /// export-declaration:
413 /// 'export' declaration
414 /// 'export' '{' declaration-seq[opt] '}'
415 ///
416 Decl *Parser::ParseExportDeclaration() {
417  assert(Tok.is(tok::kw_export));
418  SourceLocation ExportLoc = ConsumeToken();
419 
420  ParseScope ExportScope(this, Scope::DeclScope);
422  getCurScope(), ExportLoc,
423  Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
424 
425  if (Tok.isNot(tok::l_brace)) {
426  // FIXME: Factor out a ParseExternalDeclarationWithAttrs.
427  ParsedAttributesWithRange Attrs(AttrFactory);
428  MaybeParseCXX11Attributes(Attrs);
429  MaybeParseMicrosoftAttributes(Attrs);
430  ParseExternalDeclaration(Attrs);
431  return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
432  SourceLocation());
433  }
434 
435  BalancedDelimiterTracker T(*this, tok::l_brace);
436  T.consumeOpen();
437 
438  // The Modules TS draft says "An export-declaration shall declare at least one
439  // entity", but the intent is that it shall contain at least one declaration.
440  if (Tok.is(tok::r_brace) && getLangOpts().ModulesTS) {
441  Diag(ExportLoc, diag::err_export_empty)
442  << SourceRange(ExportLoc, Tok.getLocation());
443  }
444 
445  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
446  Tok.isNot(tok::eof)) {
447  ParsedAttributesWithRange Attrs(AttrFactory);
448  MaybeParseCXX11Attributes(Attrs);
449  MaybeParseMicrosoftAttributes(Attrs);
450  ParseExternalDeclaration(Attrs);
451  }
452 
453  T.consumeClose();
454  return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
455  T.getCloseLocation());
456 }
457 
458 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
459 /// using-directive. Assumes that current token is 'using'.
461 Parser::ParseUsingDirectiveOrDeclaration(DeclaratorContext Context,
462  const ParsedTemplateInfo &TemplateInfo,
463  SourceLocation &DeclEnd,
464  ParsedAttributesWithRange &attrs) {
465  assert(Tok.is(tok::kw_using) && "Not using token");
466  ObjCDeclContextSwitch ObjCDC(*this);
467 
468  // Eat 'using'.
469  SourceLocation UsingLoc = ConsumeToken();
470 
471  if (Tok.is(tok::code_completion)) {
472  Actions.CodeCompleteUsing(getCurScope());
473  cutOffParsing();
474  return nullptr;
475  }
476 
477  // Consume unexpected 'template' keywords.
478  while (Tok.is(tok::kw_template)) {
479  SourceLocation TemplateLoc = ConsumeToken();
480  Diag(TemplateLoc, diag::err_unexpected_template_after_using)
481  << FixItHint::CreateRemoval(TemplateLoc);
482  }
483 
484  // 'using namespace' means this is a using-directive.
485  if (Tok.is(tok::kw_namespace)) {
486  // Template parameters are always an error here.
487  if (TemplateInfo.Kind) {
488  SourceRange R = TemplateInfo.getSourceRange();
489  Diag(UsingLoc, diag::err_templated_using_directive_declaration)
490  << 0 /* directive */ << R << FixItHint::CreateRemoval(R);
491  }
492 
493  Decl *UsingDir = ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
494  return Actions.ConvertDeclToDeclGroup(UsingDir);
495  }
496 
497  // Otherwise, it must be a using-declaration or an alias-declaration.
498 
499  // Using declarations can't have attributes.
500  ProhibitAttributes(attrs);
501 
502  return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
503  AS_none);
504 }
505 
506 /// ParseUsingDirective - Parse C++ using-directive, assumes
507 /// that current token is 'namespace' and 'using' was already parsed.
508 ///
509 /// using-directive: [C++ 7.3.p4: namespace.udir]
510 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
511 /// namespace-name ;
512 /// [GNU] using-directive:
513 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
514 /// namespace-name attributes[opt] ;
515 ///
516 Decl *Parser::ParseUsingDirective(DeclaratorContext Context,
517  SourceLocation UsingLoc,
518  SourceLocation &DeclEnd,
519  ParsedAttributes &attrs) {
520  assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
521 
522  // Eat 'namespace'.
523  SourceLocation NamespcLoc = ConsumeToken();
524 
525  if (Tok.is(tok::code_completion)) {
527  cutOffParsing();
528  return nullptr;
529  }
530 
531  CXXScopeSpec SS;
532  // Parse (optional) nested-name-specifier.
533  ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false,
534  /*MayBePseudoDestructor=*/nullptr,
535  /*IsTypename=*/false,
536  /*LastII=*/nullptr,
537  /*OnlyNamespace=*/true);
538 
539  IdentifierInfo *NamespcName = nullptr;
540  SourceLocation IdentLoc = SourceLocation();
541 
542  // Parse namespace-name.
543  if (Tok.isNot(tok::identifier)) {
544  Diag(Tok, diag::err_expected_namespace_name);
545  // If there was invalid namespace name, skip to end of decl, and eat ';'.
546  SkipUntil(tok::semi);
547  // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
548  return nullptr;
549  }
550 
551  if (SS.isInvalid()) {
552  // Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
553  // Skip to end of the definition and eat the ';'.
554  SkipUntil(tok::semi);
555  return nullptr;
556  }
557 
558  // Parse identifier.
559  NamespcName = Tok.getIdentifierInfo();
560  IdentLoc = ConsumeToken();
561 
562  // Parse (optional) attributes (most likely GNU strong-using extension).
563  bool GNUAttr = false;
564  if (Tok.is(tok::kw___attribute)) {
565  GNUAttr = true;
566  ParseGNUAttributes(attrs);
567  }
568 
569  // Eat ';'.
570  DeclEnd = Tok.getLocation();
571  if (ExpectAndConsume(tok::semi,
572  GNUAttr ? diag::err_expected_semi_after_attribute_list
573  : diag::err_expected_semi_after_namespace_name))
574  SkipUntil(tok::semi);
575 
576  return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
577  IdentLoc, NamespcName, attrs);
578 }
579 
580 /// Parse a using-declarator (or the identifier in a C++11 alias-declaration).
581 ///
582 /// using-declarator:
583 /// 'typename'[opt] nested-name-specifier unqualified-id
584 ///
585 bool Parser::ParseUsingDeclarator(DeclaratorContext Context,
586  UsingDeclarator &D) {
587  D.clear();
588 
589  // Ignore optional 'typename'.
590  // FIXME: This is wrong; we should parse this as a typename-specifier.
591  TryConsumeToken(tok::kw_typename, D.TypenameLoc);
592 
593  if (Tok.is(tok::kw___super)) {
594  Diag(Tok.getLocation(), diag::err_super_in_using_declaration);
595  return true;
596  }
597 
598  // Parse nested-name-specifier.
599  IdentifierInfo *LastII = nullptr;
600  if (ParseOptionalCXXScopeSpecifier(D.SS, nullptr, /*EnteringContext=*/false,
601  /*MayBePseudoDtor=*/nullptr,
602  /*IsTypename=*/false,
603  /*LastII=*/&LastII))
604  return true;
605  if (D.SS.isInvalid())
606  return true;
607 
608  // Parse the unqualified-id. We allow parsing of both constructor and
609  // destructor names and allow the action module to diagnose any semantic
610  // errors.
611  //
612  // C++11 [class.qual]p2:
613  // [...] in a using-declaration that is a member-declaration, if the name
614  // specified after the nested-name-specifier is the same as the identifier
615  // or the simple-template-id's template-name in the last component of the
616  // nested-name-specifier, the name is [...] considered to name the
617  // constructor.
618  if (getLangOpts().CPlusPlus11 &&
620  Tok.is(tok::identifier) &&
621  (NextToken().is(tok::semi) || NextToken().is(tok::comma) ||
622  NextToken().is(tok::ellipsis)) &&
623  D.SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
624  !D.SS.getScopeRep()->getAsNamespace() &&
625  !D.SS.getScopeRep()->getAsNamespaceAlias()) {
626  SourceLocation IdLoc = ConsumeToken();
627  ParsedType Type =
628  Actions.getInheritingConstructorName(D.SS, IdLoc, *LastII);
629  D.Name.setConstructorName(Type, IdLoc, IdLoc);
630  } else {
631  if (ParseUnqualifiedId(
632  D.SS, /*EnteringContext=*/false,
633  /*AllowDestructorName=*/true,
634  /*AllowConstructorName=*/!(Tok.is(tok::identifier) &&
635  NextToken().is(tok::equal)),
636  /*AllowDeductionGuide=*/false,
637  nullptr, nullptr, D.Name))
638  return true;
639  }
640 
641  if (TryConsumeToken(tok::ellipsis, D.EllipsisLoc))
642  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
643  diag::warn_cxx17_compat_using_declaration_pack :
644  diag::ext_using_declaration_pack);
645 
646  return false;
647 }
648 
649 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
650 /// Assumes that 'using' was already seen.
651 ///
652 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
653 /// 'using' using-declarator-list[opt] ;
654 ///
655 /// using-declarator-list: [C++1z]
656 /// using-declarator '...'[opt]
657 /// using-declarator-list ',' using-declarator '...'[opt]
658 ///
659 /// using-declarator-list: [C++98-14]
660 /// using-declarator
661 ///
662 /// alias-declaration: C++11 [dcl.dcl]p1
663 /// 'using' identifier attribute-specifier-seq[opt] = type-id ;
664 ///
666 Parser::ParseUsingDeclaration(DeclaratorContext Context,
667  const ParsedTemplateInfo &TemplateInfo,
668  SourceLocation UsingLoc, SourceLocation &DeclEnd,
669  AccessSpecifier AS) {
670  // Check for misplaced attributes before the identifier in an
671  // alias-declaration.
672  ParsedAttributesWithRange MisplacedAttrs(AttrFactory);
673  MaybeParseCXX11Attributes(MisplacedAttrs);
674 
675  UsingDeclarator D;
676  bool InvalidDeclarator = ParseUsingDeclarator(Context, D);
677 
678  ParsedAttributesWithRange Attrs(AttrFactory);
679  MaybeParseGNUAttributes(Attrs);
680  MaybeParseCXX11Attributes(Attrs);
681 
682  // Maybe this is an alias-declaration.
683  if (Tok.is(tok::equal)) {
684  if (InvalidDeclarator) {
685  SkipUntil(tok::semi);
686  return nullptr;
687  }
688 
689  // If we had any misplaced attributes from earlier, this is where they
690  // should have been written.
691  if (MisplacedAttrs.Range.isValid()) {
692  Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed)
694  Tok.getLocation(),
695  CharSourceRange::getTokenRange(MisplacedAttrs.Range))
696  << FixItHint::CreateRemoval(MisplacedAttrs.Range);
697  Attrs.takeAllFrom(MisplacedAttrs);
698  }
699 
700  Decl *DeclFromDeclSpec = nullptr;
701  Decl *AD = ParseAliasDeclarationAfterDeclarator(
702  TemplateInfo, UsingLoc, D, DeclEnd, AS, Attrs, &DeclFromDeclSpec);
703  return Actions.ConvertDeclToDeclGroup(AD, DeclFromDeclSpec);
704  }
705 
706  // C++11 attributes are not allowed on a using-declaration, but GNU ones
707  // are.
708  ProhibitAttributes(MisplacedAttrs);
709  ProhibitAttributes(Attrs);
710 
711  // Diagnose an attempt to declare a templated using-declaration.
712  // In C++11, alias-declarations can be templates:
713  // template <...> using id = type;
714  if (TemplateInfo.Kind) {
715  SourceRange R = TemplateInfo.getSourceRange();
716  Diag(UsingLoc, diag::err_templated_using_directive_declaration)
717  << 1 /* declaration */ << R << FixItHint::CreateRemoval(R);
718 
719  // Unfortunately, we have to bail out instead of recovering by
720  // ignoring the parameters, just in case the nested name specifier
721  // depends on the parameters.
722  return nullptr;
723  }
724 
725  SmallVector<Decl *, 8> DeclsInGroup;
726  while (true) {
727  // Parse (optional) attributes (most likely GNU strong-using extension).
728  MaybeParseGNUAttributes(Attrs);
729 
730  if (InvalidDeclarator)
731  SkipUntil(tok::comma, tok::semi, StopBeforeMatch);
732  else {
733  // "typename" keyword is allowed for identifiers only,
734  // because it may be a type definition.
735  if (D.TypenameLoc.isValid() &&
736  D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
737  Diag(D.Name.getSourceRange().getBegin(),
738  diag::err_typename_identifiers_only)
739  << FixItHint::CreateRemoval(SourceRange(D.TypenameLoc));
740  // Proceed parsing, but discard the typename keyword.
741  D.TypenameLoc = SourceLocation();
742  }
743 
744  Decl *UD = Actions.ActOnUsingDeclaration(getCurScope(), AS, UsingLoc,
745  D.TypenameLoc, D.SS, D.Name,
746  D.EllipsisLoc, Attrs);
747  if (UD)
748  DeclsInGroup.push_back(UD);
749  }
750 
751  if (!TryConsumeToken(tok::comma))
752  break;
753 
754  // Parse another using-declarator.
755  Attrs.clear();
756  InvalidDeclarator = ParseUsingDeclarator(Context, D);
757  }
758 
759  if (DeclsInGroup.size() > 1)
760  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
761  diag::warn_cxx17_compat_multi_using_declaration :
762  diag::ext_multi_using_declaration);
763 
764  // Eat ';'.
765  DeclEnd = Tok.getLocation();
766  if (ExpectAndConsume(tok::semi, diag::err_expected_after,
767  !Attrs.empty() ? "attributes list"
768  : "using declaration"))
769  SkipUntil(tok::semi);
770 
771  return Actions.BuildDeclaratorGroup(DeclsInGroup);
772 }
773 
774 Decl *Parser::ParseAliasDeclarationAfterDeclarator(
775  const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc,
776  UsingDeclarator &D, SourceLocation &DeclEnd, AccessSpecifier AS,
777  ParsedAttributes &Attrs, Decl **OwnedType) {
778  if (ExpectAndConsume(tok::equal)) {
779  SkipUntil(tok::semi);
780  return nullptr;
781  }
782 
783  Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
784  diag::warn_cxx98_compat_alias_declaration :
785  diag::ext_alias_declaration);
786 
787  // Type alias templates cannot be specialized.
788  int SpecKind = -1;
789  if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
790  D.Name.getKind() == UnqualifiedIdKind::IK_TemplateId)
791  SpecKind = 0;
792  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
793  SpecKind = 1;
794  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
795  SpecKind = 2;
796  if (SpecKind != -1) {
797  SourceRange Range;
798  if (SpecKind == 0)
799  Range = SourceRange(D.Name.TemplateId->LAngleLoc,
800  D.Name.TemplateId->RAngleLoc);
801  else
802  Range = TemplateInfo.getSourceRange();
803  Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
804  << SpecKind << Range;
805  SkipUntil(tok::semi);
806  return nullptr;
807  }
808 
809  // Name must be an identifier.
810  if (D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
811  Diag(D.Name.StartLocation, diag::err_alias_declaration_not_identifier);
812  // No removal fixit: can't recover from this.
813  SkipUntil(tok::semi);
814  return nullptr;
815  } else if (D.TypenameLoc.isValid())
816  Diag(D.TypenameLoc, diag::err_alias_declaration_not_identifier)
818  D.TypenameLoc,
819  D.SS.isNotEmpty() ? D.SS.getEndLoc() : D.TypenameLoc));
820  else if (D.SS.isNotEmpty())
821  Diag(D.SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
822  << FixItHint::CreateRemoval(D.SS.getRange());
823  if (D.EllipsisLoc.isValid())
824  Diag(D.EllipsisLoc, diag::err_alias_declaration_pack_expansion)
825  << FixItHint::CreateRemoval(SourceRange(D.EllipsisLoc));
826 
827  Decl *DeclFromDeclSpec = nullptr;
829  nullptr,
830  TemplateInfo.Kind ? DeclaratorContext::AliasTemplateContext
832  AS, &DeclFromDeclSpec, &Attrs);
833  if (OwnedType)
834  *OwnedType = DeclFromDeclSpec;
835 
836  // Eat ';'.
837  DeclEnd = Tok.getLocation();
838  if (ExpectAndConsume(tok::semi, diag::err_expected_after,
839  !Attrs.empty() ? "attributes list"
840  : "alias declaration"))
841  SkipUntil(tok::semi);
842 
843  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
844  MultiTemplateParamsArg TemplateParamsArg(
845  TemplateParams ? TemplateParams->data() : nullptr,
846  TemplateParams ? TemplateParams->size() : 0);
847  return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
848  UsingLoc, D.Name, Attrs, TypeAlias,
849  DeclFromDeclSpec);
850 }
851 
852 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
853 ///
854 /// [C++0x] static_assert-declaration:
855 /// static_assert ( constant-expression , string-literal ) ;
856 ///
857 /// [C11] static_assert-declaration:
858 /// _Static_assert ( constant-expression , string-literal ) ;
859 ///
860 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
861  assert(Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) &&
862  "Not a static_assert declaration");
863 
864  if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
865  Diag(Tok, diag::ext_c11_static_assert);
866  if (Tok.is(tok::kw_static_assert))
867  Diag(Tok, diag::warn_cxx98_compat_static_assert);
868 
869  SourceLocation StaticAssertLoc = ConsumeToken();
870 
871  BalancedDelimiterTracker T(*this, tok::l_paren);
872  if (T.consumeOpen()) {
873  Diag(Tok, diag::err_expected) << tok::l_paren;
875  return nullptr;
876  }
877 
878  EnterExpressionEvaluationContext ConstantEvaluated(
881  if (AssertExpr.isInvalid()) {
883  return nullptr;
884  }
885 
886  ExprResult AssertMessage;
887  if (Tok.is(tok::r_paren)) {
889  ? diag::warn_cxx14_compat_static_assert_no_message
890  : diag::ext_static_assert_no_message)
891  << (getLangOpts().CPlusPlus17
892  ? FixItHint()
893  : FixItHint::CreateInsertion(Tok.getLocation(), ", \"\""));
894  } else {
895  if (ExpectAndConsume(tok::comma)) {
896  SkipUntil(tok::semi);
897  return nullptr;
898  }
899 
900  if (!isTokenStringLiteral()) {
901  Diag(Tok, diag::err_expected_string_literal)
902  << /*Source='static_assert'*/1;
904  return nullptr;
905  }
906 
907  AssertMessage = ParseStringLiteralExpression();
908  if (AssertMessage.isInvalid()) {
910  return nullptr;
911  }
912  }
913 
914  T.consumeClose();
915 
916  DeclEnd = Tok.getLocation();
917  ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
918 
919  return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
920  AssertExpr.get(),
921  AssertMessage.get(),
922  T.getCloseLocation());
923 }
924 
925 /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
926 ///
927 /// 'decltype' ( expression )
928 /// 'decltype' ( 'auto' ) [C++1y]
929 ///
930 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
931  assert(Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)
932  && "Not a decltype specifier");
933 
935  SourceLocation StartLoc = Tok.getLocation();
936  SourceLocation EndLoc;
937 
938  if (Tok.is(tok::annot_decltype)) {
939  Result = getExprAnnotation(Tok);
940  EndLoc = Tok.getAnnotationEndLoc();
941  ConsumeAnnotationToken();
942  if (Result.isInvalid()) {
943  DS.SetTypeSpecError();
944  return EndLoc;
945  }
946  } else {
947  if (Tok.getIdentifierInfo()->isStr("decltype"))
948  Diag(Tok, diag::warn_cxx98_compat_decltype);
949 
950  ConsumeToken();
951 
952  BalancedDelimiterTracker T(*this, tok::l_paren);
953  if (T.expectAndConsume(diag::err_expected_lparen_after,
954  "decltype", tok::r_paren)) {
955  DS.SetTypeSpecError();
956  return T.getOpenLocation() == Tok.getLocation() ?
957  StartLoc : T.getOpenLocation();
958  }
959 
960  // Check for C++1y 'decltype(auto)'.
961  if (Tok.is(tok::kw_auto)) {
962  // No need to disambiguate here: an expression can't start with 'auto',
963  // because the typename-specifier in a function-style cast operation can't
964  // be 'auto'.
965  Diag(Tok.getLocation(),
966  getLangOpts().CPlusPlus14
967  ? diag::warn_cxx11_compat_decltype_auto_type_specifier
968  : diag::ext_decltype_auto_type_specifier);
969  ConsumeToken();
970  } else {
971  // Parse the expression
972 
973  // C++11 [dcl.type.simple]p4:
974  // The operand of the decltype specifier is an unevaluated operand.
978  Result =
980  return E->hasPlaceholderType() ? ExprError() : E;
981  });
982  if (Result.isInvalid()) {
983  DS.SetTypeSpecError();
984  if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
985  EndLoc = ConsumeParen();
986  } else {
987  if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
988  // Backtrack to get the location of the last token before the semi.
989  PP.RevertCachedTokens(2);
990  ConsumeToken(); // the semi.
991  EndLoc = ConsumeAnyToken();
992  assert(Tok.is(tok::semi));
993  } else {
994  EndLoc = Tok.getLocation();
995  }
996  }
997  return EndLoc;
998  }
999 
1000  Result = Actions.ActOnDecltypeExpression(Result.get());
1001  }
1002 
1003  // Match the ')'
1004  T.consumeClose();
1005  if (T.getCloseLocation().isInvalid()) {
1006  DS.SetTypeSpecError();
1007  // FIXME: this should return the location of the last token
1008  // that was consumed (by "consumeClose()")
1009  return T.getCloseLocation();
1010  }
1011 
1012  if (Result.isInvalid()) {
1013  DS.SetTypeSpecError();
1014  return T.getCloseLocation();
1015  }
1016 
1017  EndLoc = T.getCloseLocation();
1018  }
1019  assert(!Result.isInvalid());
1020 
1021  const char *PrevSpec = nullptr;
1022  unsigned DiagID;
1023  const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1024  // Check for duplicate type specifiers (e.g. "int decltype(a)").
1025  if (Result.get()
1026  ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
1027  DiagID, Result.get(), Policy)
1028  : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
1029  DiagID, Policy)) {
1030  Diag(StartLoc, DiagID) << PrevSpec;
1031  DS.SetTypeSpecError();
1032  }
1033  return EndLoc;
1034 }
1035 
1036 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
1037  SourceLocation StartLoc,
1038  SourceLocation EndLoc) {
1039  // make sure we have a token we can turn into an annotation token
1040  if (PP.isBacktrackEnabled())
1041  PP.RevertCachedTokens(1);
1042  else
1043  PP.EnterToken(Tok, /*IsReinject*/true);
1044 
1045  Tok.setKind(tok::annot_decltype);
1046  setExprAnnotation(Tok,
1047  DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() :
1049  ExprError());
1050  Tok.setAnnotationEndLoc(EndLoc);
1051  Tok.setLocation(StartLoc);
1052  PP.AnnotateCachedTokens(Tok);
1053 }
1054 
1055 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
1056  assert(Tok.is(tok::kw___underlying_type) &&
1057  "Not an underlying type specifier");
1058 
1059  SourceLocation StartLoc = ConsumeToken();
1060  BalancedDelimiterTracker T(*this, tok::l_paren);
1061  if (T.expectAndConsume(diag::err_expected_lparen_after,
1062  "__underlying_type", tok::r_paren)) {
1063  return;
1064  }
1065 
1066  TypeResult Result = ParseTypeName();
1067  if (Result.isInvalid()) {
1068  SkipUntil(tok::r_paren, StopAtSemi);
1069  return;
1070  }
1071 
1072  // Match the ')'
1073  T.consumeClose();
1074  if (T.getCloseLocation().isInvalid())
1075  return;
1076 
1077  const char *PrevSpec = nullptr;
1078  unsigned DiagID;
1079  if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
1080  DiagID, Result.get(),
1081  Actions.getASTContext().getPrintingPolicy()))
1082  Diag(StartLoc, DiagID) << PrevSpec;
1083  DS.setTypeofParensRange(T.getRange());
1084 }
1085 
1086 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
1087 /// class name or decltype-specifier. Note that we only check that the result
1088 /// names a type; semantic analysis will need to verify that the type names a
1089 /// class. The result is either a type or null, depending on whether a type
1090 /// name was found.
1091 ///
1092 /// base-type-specifier: [C++11 class.derived]
1093 /// class-or-decltype
1094 /// class-or-decltype: [C++11 class.derived]
1095 /// nested-name-specifier[opt] class-name
1096 /// decltype-specifier
1097 /// class-name: [C++ class.name]
1098 /// identifier
1099 /// simple-template-id
1100 ///
1101 /// In C++98, instead of base-type-specifier, we have:
1102 ///
1103 /// ::[opt] nested-name-specifier[opt] class-name
1104 TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
1105  SourceLocation &EndLocation) {
1106  // Ignore attempts to use typename
1107  if (Tok.is(tok::kw_typename)) {
1108  Diag(Tok, diag::err_expected_class_name_not_template)
1110  ConsumeToken();
1111  }
1112 
1113  // Parse optional nested-name-specifier
1114  CXXScopeSpec SS;
1115  if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false))
1116  return true;
1117 
1118  BaseLoc = Tok.getLocation();
1119 
1120  // Parse decltype-specifier
1121  // tok == kw_decltype is just error recovery, it can only happen when SS
1122  // isn't empty
1123  if (Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
1124  if (SS.isNotEmpty())
1125  Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
1127  // Fake up a Declarator to use with ActOnTypeName.
1128  DeclSpec DS(AttrFactory);
1129 
1130  EndLocation = ParseDecltypeSpecifier(DS);
1131 
1132  Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
1133  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1134  }
1135 
1136  // Check whether we have a template-id that names a type.
1137  if (Tok.is(tok::annot_template_id)) {
1138  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1139  if (TemplateId->Kind == TNK_Type_template ||
1140  TemplateId->Kind == TNK_Dependent_template_name ||
1141  TemplateId->Kind == TNK_Undeclared_template) {
1142  AnnotateTemplateIdTokenAsType(/*IsClassName*/true);
1143 
1144  assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
1145  ParsedType Type = getTypeAnnotation(Tok);
1146  EndLocation = Tok.getAnnotationEndLoc();
1147  ConsumeAnnotationToken();
1148 
1149  if (Type)
1150  return Type;
1151  return true;
1152  }
1153 
1154  // Fall through to produce an error below.
1155  }
1156 
1157  if (Tok.isNot(tok::identifier)) {
1158  Diag(Tok, diag::err_expected_class_name);
1159  return true;
1160  }
1161 
1163  SourceLocation IdLoc = ConsumeToken();
1164 
1165  if (Tok.is(tok::less)) {
1166  // It looks the user intended to write a template-id here, but the
1167  // template-name was wrong. Try to fix that.
1169  TemplateTy Template;
1170  if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
1171  &SS, Template, TNK)) {
1172  Diag(IdLoc, diag::err_unknown_template_name)
1173  << Id;
1174  }
1175 
1176  if (!Template) {
1177  TemplateArgList TemplateArgs;
1178  SourceLocation LAngleLoc, RAngleLoc;
1179  ParseTemplateIdAfterTemplateName(true, LAngleLoc, TemplateArgs,
1180  RAngleLoc);
1181  return true;
1182  }
1183 
1184  // Form the template name
1186  TemplateName.setIdentifier(Id, IdLoc);
1187 
1188  // Parse the full template-id, then turn it into a type.
1189  if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1190  TemplateName))
1191  return true;
1192  if (TNK == TNK_Type_template || TNK == TNK_Dependent_template_name)
1193  AnnotateTemplateIdTokenAsType(/*IsClassName*/true);
1194 
1195  // If we didn't end up with a typename token, there's nothing more we
1196  // can do.
1197  if (Tok.isNot(tok::annot_typename))
1198  return true;
1199 
1200  // Retrieve the type from the annotation token, consume that token, and
1201  // return.
1202  EndLocation = Tok.getAnnotationEndLoc();
1203  ParsedType Type = getTypeAnnotation(Tok);
1204  ConsumeAnnotationToken();
1205  return Type;
1206  }
1207 
1208  // We have an identifier; check whether it is actually a type.
1209  IdentifierInfo *CorrectedII = nullptr;
1210  ParsedType Type = Actions.getTypeName(
1211  *Id, IdLoc, getCurScope(), &SS, /*IsClassName=*/true, false, nullptr,
1212  /*IsCtorOrDtorName=*/false,
1213  /*NonTrivialTypeSourceInfo=*/true,
1214  /*IsClassTemplateDeductionContext*/ false, &CorrectedII);
1215  if (!Type) {
1216  Diag(IdLoc, diag::err_expected_class_name);
1217  return true;
1218  }
1219 
1220  // Consume the identifier.
1221  EndLocation = IdLoc;
1222 
1223  // Fake up a Declarator to use with ActOnTypeName.
1224  DeclSpec DS(AttrFactory);
1225  DS.SetRangeStart(IdLoc);
1226  DS.SetRangeEnd(EndLocation);
1227  DS.getTypeSpecScope() = SS;
1228 
1229  const char *PrevSpec = nullptr;
1230  unsigned DiagID;
1231  DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type,
1232  Actions.getASTContext().getPrintingPolicy());
1233 
1234  Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
1235  return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1236 }
1237 
1238 void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
1239  while (Tok.isOneOf(tok::kw___single_inheritance,
1240  tok::kw___multiple_inheritance,
1241  tok::kw___virtual_inheritance)) {
1242  IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1243  SourceLocation AttrNameLoc = ConsumeToken();
1244  attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
1246  }
1247 }
1248 
1249 /// Determine whether the following tokens are valid after a type-specifier
1250 /// which could be a standalone declaration. This will conservatively return
1251 /// true if there's any doubt, and is appropriate for insert-';' fixits.
1252 bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
1253  // This switch enumerates the valid "follow" set for type-specifiers.
1254  switch (Tok.getKind()) {
1255  default: break;
1256  case tok::semi: // struct foo {...} ;
1257  case tok::star: // struct foo {...} * P;
1258  case tok::amp: // struct foo {...} & R = ...
1259  case tok::ampamp: // struct foo {...} && R = ...
1260  case tok::identifier: // struct foo {...} V ;
1261  case tok::r_paren: //(struct foo {...} ) {4}
1262  case tok::coloncolon: // struct foo {...} :: a::b;
1263  case tok::annot_cxxscope: // struct foo {...} a:: b;
1264  case tok::annot_typename: // struct foo {...} a ::b;
1265  case tok::annot_template_id: // struct foo {...} a<int> ::b;
1266  case tok::kw_decltype: // struct foo {...} decltype (a)::b;
1267  case tok::l_paren: // struct foo {...} ( x);
1268  case tok::comma: // __builtin_offsetof(struct foo{...} ,
1269  case tok::kw_operator: // struct foo operator ++() {...}
1270  case tok::kw___declspec: // struct foo {...} __declspec(...)
1271  case tok::l_square: // void f(struct f [ 3])
1272  case tok::ellipsis: // void f(struct f ... [Ns])
1273  // FIXME: we should emit semantic diagnostic when declaration
1274  // attribute is in type attribute position.
1275  case tok::kw___attribute: // struct foo __attribute__((used)) x;
1276  case tok::annot_pragma_pack: // struct foo {...} _Pragma(pack(pop));
1277  // struct foo {...} _Pragma(section(...));
1278  case tok::annot_pragma_ms_pragma:
1279  // struct foo {...} _Pragma(vtordisp(pop));
1280  case tok::annot_pragma_ms_vtordisp:
1281  // struct foo {...} _Pragma(pointers_to_members(...));
1282  case tok::annot_pragma_ms_pointers_to_members:
1283  return true;
1284  case tok::colon:
1285  return CouldBeBitfield; // enum E { ... } : 2;
1286  // Microsoft compatibility
1287  case tok::kw___cdecl: // struct foo {...} __cdecl x;
1288  case tok::kw___fastcall: // struct foo {...} __fastcall x;
1289  case tok::kw___stdcall: // struct foo {...} __stdcall x;
1290  case tok::kw___thiscall: // struct foo {...} __thiscall x;
1291  case tok::kw___vectorcall: // struct foo {...} __vectorcall x;
1292  // We will diagnose these calling-convention specifiers on non-function
1293  // declarations later, so claim they are valid after a type specifier.
1294  return getLangOpts().MicrosoftExt;
1295  // Type qualifiers
1296  case tok::kw_const: // struct foo {...} const x;
1297  case tok::kw_volatile: // struct foo {...} volatile x;
1298  case tok::kw_restrict: // struct foo {...} restrict x;
1299  case tok::kw__Atomic: // struct foo {...} _Atomic x;
1300  case tok::kw___unaligned: // struct foo {...} __unaligned *x;
1301  // Function specifiers
1302  // Note, no 'explicit'. An explicit function must be either a conversion
1303  // operator or a constructor. Either way, it can't have a return type.
1304  case tok::kw_inline: // struct foo inline f();
1305  case tok::kw_virtual: // struct foo virtual f();
1306  case tok::kw_friend: // struct foo friend f();
1307  // Storage-class specifiers
1308  case tok::kw_static: // struct foo {...} static x;
1309  case tok::kw_extern: // struct foo {...} extern x;
1310  case tok::kw_typedef: // struct foo {...} typedef x;
1311  case tok::kw_register: // struct foo {...} register x;
1312  case tok::kw_auto: // struct foo {...} auto x;
1313  case tok::kw_mutable: // struct foo {...} mutable x;
1314  case tok::kw_thread_local: // struct foo {...} thread_local x;
1315  case tok::kw_constexpr: // struct foo {...} constexpr x;
1316  // As shown above, type qualifiers and storage class specifiers absolutely
1317  // can occur after class specifiers according to the grammar. However,
1318  // almost no one actually writes code like this. If we see one of these,
1319  // it is much more likely that someone missed a semi colon and the
1320  // type/storage class specifier we're seeing is part of the *next*
1321  // intended declaration, as in:
1322  //
1323  // struct foo { ... }
1324  // typedef int X;
1325  //
1326  // We'd really like to emit a missing semicolon error instead of emitting
1327  // an error on the 'int' saying that you can't have two type specifiers in
1328  // the same declaration of X. Because of this, we look ahead past this
1329  // token to see if it's a type specifier. If so, we know the code is
1330  // otherwise invalid, so we can produce the expected semi error.
1331  if (!isKnownToBeTypeSpecifier(NextToken()))
1332  return true;
1333  break;
1334  case tok::r_brace: // struct bar { struct foo {...} }
1335  // Missing ';' at end of struct is accepted as an extension in C mode.
1336  if (!getLangOpts().CPlusPlus)
1337  return true;
1338  break;
1339  case tok::greater:
1340  // template<class T = class X>
1341  return getLangOpts().CPlusPlus;
1342  }
1343  return false;
1344 }
1345 
1346 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1347 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1348 /// until we reach the start of a definition or see a token that
1349 /// cannot start a definition.
1350 ///
1351 /// class-specifier: [C++ class]
1352 /// class-head '{' member-specification[opt] '}'
1353 /// class-head '{' member-specification[opt] '}' attributes[opt]
1354 /// class-head:
1355 /// class-key identifier[opt] base-clause[opt]
1356 /// class-key nested-name-specifier identifier base-clause[opt]
1357 /// class-key nested-name-specifier[opt] simple-template-id
1358 /// base-clause[opt]
1359 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1360 /// [GNU] class-key attributes[opt] nested-name-specifier
1361 /// identifier base-clause[opt]
1362 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1363 /// simple-template-id base-clause[opt]
1364 /// class-key:
1365 /// 'class'
1366 /// 'struct'
1367 /// 'union'
1368 ///
1369 /// elaborated-type-specifier: [C++ dcl.type.elab]
1370 /// class-key ::[opt] nested-name-specifier[opt] identifier
1371 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1372 /// simple-template-id
1373 ///
1374 /// Note that the C++ class-specifier and elaborated-type-specifier,
1375 /// together, subsume the C99 struct-or-union-specifier:
1376 ///
1377 /// struct-or-union-specifier: [C99 6.7.2.1]
1378 /// struct-or-union identifier[opt] '{' struct-contents '}'
1379 /// struct-or-union identifier
1380 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1381 /// '}' attributes[opt]
1382 /// [GNU] struct-or-union attributes[opt] identifier
1383 /// struct-or-union:
1384 /// 'struct'
1385 /// 'union'
1386 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1387  SourceLocation StartLoc, DeclSpec &DS,
1388  const ParsedTemplateInfo &TemplateInfo,
1389  AccessSpecifier AS,
1390  bool EnteringContext, DeclSpecContext DSC,
1391  ParsedAttributesWithRange &Attributes) {
1393  if (TagTokKind == tok::kw_struct)
1394  TagType = DeclSpec::TST_struct;
1395  else if (TagTokKind == tok::kw___interface)
1396  TagType = DeclSpec::TST_interface;
1397  else if (TagTokKind == tok::kw_class)
1398  TagType = DeclSpec::TST_class;
1399  else {
1400  assert(TagTokKind == tok::kw_union && "Not a class specifier");
1401  TagType = DeclSpec::TST_union;
1402  }
1403 
1404  if (Tok.is(tok::code_completion)) {
1405  // Code completion for a struct, class, or union name.
1406  Actions.CodeCompleteTag(getCurScope(), TagType);
1407  return cutOffParsing();
1408  }
1409 
1410  // C++03 [temp.explicit] 14.7.2/8:
1411  // The usual access checking rules do not apply to names used to specify
1412  // explicit instantiations.
1413  //
1414  // As an extension we do not perform access checking on the names used to
1415  // specify explicit specializations either. This is important to allow
1416  // specializing traits classes for private types.
1417  //
1418  // Note that we don't suppress if this turns out to be an elaborated
1419  // type specifier.
1420  bool shouldDelayDiagsInTag =
1421  (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1422  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1423  SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1424 
1425  ParsedAttributesWithRange attrs(AttrFactory);
1426  // If attributes exist after tag, parse them.
1427  MaybeParseGNUAttributes(attrs);
1428  MaybeParseMicrosoftDeclSpecs(attrs);
1429 
1430  // Parse inheritance specifiers.
1431  if (Tok.isOneOf(tok::kw___single_inheritance,
1432  tok::kw___multiple_inheritance,
1433  tok::kw___virtual_inheritance))
1434  ParseMicrosoftInheritanceClassAttributes(attrs);
1435 
1436  // If C++0x attributes exist here, parse them.
1437  // FIXME: Are we consistent with the ordering of parsing of different
1438  // styles of attributes?
1439  MaybeParseCXX11Attributes(attrs);
1440 
1441  // Source location used by FIXIT to insert misplaced
1442  // C++11 attributes
1443  SourceLocation AttrFixitLoc = Tok.getLocation();
1444 
1445  if (TagType == DeclSpec::TST_struct &&
1446  Tok.isNot(tok::identifier) &&
1447  !Tok.isAnnotation() &&
1448  Tok.getIdentifierInfo() &&
1449  Tok.isOneOf(tok::kw___is_abstract,
1450  tok::kw___is_aggregate,
1451  tok::kw___is_arithmetic,
1452  tok::kw___is_array,
1453  tok::kw___is_assignable,
1454  tok::kw___is_base_of,
1455  tok::kw___is_class,
1456  tok::kw___is_complete_type,
1457  tok::kw___is_compound,
1458  tok::kw___is_const,
1459  tok::kw___is_constructible,
1460  tok::kw___is_convertible,
1461  tok::kw___is_convertible_to,
1462  tok::kw___is_destructible,
1463  tok::kw___is_empty,
1464  tok::kw___is_enum,
1465  tok::kw___is_floating_point,
1466  tok::kw___is_final,
1467  tok::kw___is_function,
1468  tok::kw___is_fundamental,
1469  tok::kw___is_integral,
1470  tok::kw___is_interface_class,
1471  tok::kw___is_literal,
1472  tok::kw___is_lvalue_expr,
1473  tok::kw___is_lvalue_reference,
1474  tok::kw___is_member_function_pointer,
1475  tok::kw___is_member_object_pointer,
1476  tok::kw___is_member_pointer,
1477  tok::kw___is_nothrow_assignable,
1478  tok::kw___is_nothrow_constructible,
1479  tok::kw___is_nothrow_destructible,
1480  tok::kw___is_object,
1481  tok::kw___is_pod,
1482  tok::kw___is_pointer,
1483  tok::kw___is_polymorphic,
1484  tok::kw___is_reference,
1485  tok::kw___is_rvalue_expr,
1486  tok::kw___is_rvalue_reference,
1487  tok::kw___is_same,
1488  tok::kw___is_scalar,
1489  tok::kw___is_sealed,
1490  tok::kw___is_signed,
1491  tok::kw___is_standard_layout,
1492  tok::kw___is_trivial,
1493  tok::kw___is_trivially_assignable,
1494  tok::kw___is_trivially_constructible,
1495  tok::kw___is_trivially_copyable,
1496  tok::kw___is_union,
1497  tok::kw___is_unsigned,
1498  tok::kw___is_void,
1499  tok::kw___is_volatile))
1500  // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1501  // name of struct templates, but some are keywords in GCC >= 4.3
1502  // and Clang. Therefore, when we see the token sequence "struct
1503  // X", make X into a normal identifier rather than a keyword, to
1504  // allow libstdc++ 4.2 and libc++ to work properly.
1505  TryKeywordIdentFallback(true);
1506 
1507  struct PreserveAtomicIdentifierInfoRAII {
1508  PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled)
1509  : AtomicII(nullptr) {
1510  if (!Enabled)
1511  return;
1512  assert(Tok.is(tok::kw__Atomic));
1513  AtomicII = Tok.getIdentifierInfo();
1514  AtomicII->revertTokenIDToIdentifier();
1515  Tok.setKind(tok::identifier);
1516  }
1517  ~PreserveAtomicIdentifierInfoRAII() {
1518  if (!AtomicII)
1519  return;
1520  AtomicII->revertIdentifierToTokenID(tok::kw__Atomic);
1521  }
1522  IdentifierInfo *AtomicII;
1523  };
1524 
1525  // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
1526  // implementation for VS2013 uses _Atomic as an identifier for one of the
1527  // classes in <atomic>. When we are parsing 'struct _Atomic', don't consider
1528  // '_Atomic' to be a keyword. We are careful to undo this so that clang can
1529  // use '_Atomic' in its own header files.
1530  bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat &&
1531  Tok.is(tok::kw__Atomic) &&
1532  TagType == DeclSpec::TST_struct;
1533  PreserveAtomicIdentifierInfoRAII AtomicTokenGuard(
1534  Tok, ShouldChangeAtomicToIdentifier);
1535 
1536  // Parse the (optional) nested-name-specifier.
1537  CXXScopeSpec &SS = DS.getTypeSpecScope();
1538  if (getLangOpts().CPlusPlus) {
1539  // "FOO : BAR" is not a potential typo for "FOO::BAR". In this context it
1540  // is a base-specifier-list.
1542 
1543  CXXScopeSpec Spec;
1544  bool HasValidSpec = true;
1545  if (ParseOptionalCXXScopeSpecifier(Spec, nullptr, EnteringContext)) {
1546  DS.SetTypeSpecError();
1547  HasValidSpec = false;
1548  }
1549  if (Spec.isSet())
1550  if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) {
1551  Diag(Tok, diag::err_expected) << tok::identifier;
1552  HasValidSpec = false;
1553  }
1554  if (HasValidSpec)
1555  SS = Spec;
1556  }
1557 
1558  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1559 
1560  auto RecoverFromUndeclaredTemplateName = [&](IdentifierInfo *Name,
1561  SourceLocation NameLoc,
1562  SourceRange TemplateArgRange,
1563  bool KnownUndeclared) {
1564  Diag(NameLoc, diag::err_explicit_spec_non_template)
1565  << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1566  << TagTokKind << Name << TemplateArgRange << KnownUndeclared;
1567 
1568  // Strip off the last template parameter list if it was empty, since
1569  // we've removed its template argument list.
1570  if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1571  if (TemplateParams->size() > 1) {
1572  TemplateParams->pop_back();
1573  } else {
1574  TemplateParams = nullptr;
1575  const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
1576  ParsedTemplateInfo::NonTemplate;
1577  }
1578  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1579  // Pretend this is just a forward declaration.
1580  TemplateParams = nullptr;
1581  const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
1582  ParsedTemplateInfo::NonTemplate;
1583  const_cast<ParsedTemplateInfo &>(TemplateInfo).TemplateLoc =
1584  SourceLocation();
1585  const_cast<ParsedTemplateInfo &>(TemplateInfo).ExternLoc =
1586  SourceLocation();
1587  }
1588  };
1589 
1590  // Parse the (optional) class name or simple-template-id.
1591  IdentifierInfo *Name = nullptr;
1592  SourceLocation NameLoc;
1593  TemplateIdAnnotation *TemplateId = nullptr;
1594  if (Tok.is(tok::identifier)) {
1595  Name = Tok.getIdentifierInfo();
1596  NameLoc = ConsumeToken();
1597 
1598  if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1599  // The name was supposed to refer to a template, but didn't.
1600  // Eat the template argument list and try to continue parsing this as
1601  // a class (or template thereof).
1602  TemplateArgList TemplateArgs;
1603  SourceLocation LAngleLoc, RAngleLoc;
1604  if (ParseTemplateIdAfterTemplateName(true, LAngleLoc, TemplateArgs,
1605  RAngleLoc)) {
1606  // We couldn't parse the template argument list at all, so don't
1607  // try to give any location information for the list.
1608  LAngleLoc = RAngleLoc = SourceLocation();
1609  }
1610  RecoverFromUndeclaredTemplateName(
1611  Name, NameLoc, SourceRange(LAngleLoc, RAngleLoc), false);
1612  }
1613  } else if (Tok.is(tok::annot_template_id)) {
1614  TemplateId = takeTemplateIdAnnotation(Tok);
1615  NameLoc = ConsumeAnnotationToken();
1616 
1617  if (TemplateId->Kind == TNK_Undeclared_template) {
1618  // Try to resolve the template name to a type template.
1619  Actions.ActOnUndeclaredTypeTemplateName(getCurScope(), TemplateId->Template,
1620  TemplateId->Kind, NameLoc, Name);
1621  if (TemplateId->Kind == TNK_Undeclared_template) {
1622  RecoverFromUndeclaredTemplateName(
1623  Name, NameLoc,
1624  SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc), true);
1625  TemplateId = nullptr;
1626  }
1627  }
1628 
1629  if (TemplateId && TemplateId->Kind != TNK_Type_template &&
1630  TemplateId->Kind != TNK_Dependent_template_name) {
1631  // The template-name in the simple-template-id refers to
1632  // something other than a class template. Give an appropriate
1633  // error message and skip to the ';'.
1634  SourceRange Range(NameLoc);
1635  if (SS.isNotEmpty())
1636  Range.setBegin(SS.getBeginLoc());
1637 
1638  // FIXME: Name may be null here.
1639  Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1640  << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;
1641 
1642  DS.SetTypeSpecError();
1643  SkipUntil(tok::semi, StopBeforeMatch);
1644  return;
1645  }
1646  }
1647 
1648  // There are four options here.
1649  // - If we are in a trailing return type, this is always just a reference,
1650  // and we must not try to parse a definition. For instance,
1651  // [] () -> struct S { };
1652  // does not define a type.
1653  // - If we have 'struct foo {...', 'struct foo :...',
1654  // 'struct foo final :' or 'struct foo final {', then this is a definition.
1655  // - If we have 'struct foo;', then this is either a forward declaration
1656  // or a friend declaration, which have to be treated differently.
1657  // - Otherwise we have something like 'struct foo xyz', a reference.
1658  //
1659  // We also detect these erroneous cases to provide better diagnostic for
1660  // C++11 attributes parsing.
1661  // - attributes follow class name:
1662  // struct foo [[]] {};
1663  // - attributes appear before or after 'final':
1664  // struct foo [[]] final [[]] {};
1665  //
1666  // However, in type-specifier-seq's, things look like declarations but are
1667  // just references, e.g.
1668  // new struct s;
1669  // or
1670  // &T::operator struct s;
1671  // For these, DSC is DeclSpecContext::DSC_type_specifier or
1672  // DeclSpecContext::DSC_alias_declaration.
1673 
1674  // If there are attributes after class name, parse them.
1675  MaybeParseCXX11Attributes(Attributes);
1676 
1677  const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1678  Sema::TagUseKind TUK;
1679  if (DSC == DeclSpecContext::DSC_trailing)
1680  TUK = Sema::TUK_Reference;
1681  else if (Tok.is(tok::l_brace) ||
1682  (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1683  (isCXX11FinalKeyword() &&
1684  (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1685  if (DS.isFriendSpecified()) {
1686  // C++ [class.friend]p2:
1687  // A class shall not be defined in a friend declaration.
1688  Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1689  << SourceRange(DS.getFriendSpecLoc());
1690 
1691  // Skip everything up to the semicolon, so that this looks like a proper
1692  // friend class (or template thereof) declaration.
1693  SkipUntil(tok::semi, StopBeforeMatch);
1694  TUK = Sema::TUK_Friend;
1695  } else {
1696  // Okay, this is a class definition.
1697  TUK = Sema::TUK_Definition;
1698  }
1699  } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) ||
1700  NextToken().is(tok::kw_alignas))) {
1701  // We can't tell if this is a definition or reference
1702  // until we skipped the 'final' and C++11 attribute specifiers.
1703  TentativeParsingAction PA(*this);
1704 
1705  // Skip the 'final' keyword.
1706  ConsumeToken();
1707 
1708  // Skip C++11 attribute specifiers.
1709  while (true) {
1710  if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
1711  ConsumeBracket();
1712  if (!SkipUntil(tok::r_square, StopAtSemi))
1713  break;
1714  } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
1715  ConsumeToken();
1716  ConsumeParen();
1717  if (!SkipUntil(tok::r_paren, StopAtSemi))
1718  break;
1719  } else {
1720  break;
1721  }
1722  }
1723 
1724  if (Tok.isOneOf(tok::l_brace, tok::colon))
1725  TUK = Sema::TUK_Definition;
1726  else
1727  TUK = Sema::TUK_Reference;
1728 
1729  PA.Revert();
1730  } else if (!isTypeSpecifier(DSC) &&
1731  (Tok.is(tok::semi) ||
1732  (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1734  if (Tok.isNot(tok::semi)) {
1735  const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1736  // A semicolon was missing after this declaration. Diagnose and recover.
1737  ExpectAndConsume(tok::semi, diag::err_expected_after,
1738  DeclSpec::getSpecifierName(TagType, PPol));
1739  PP.EnterToken(Tok, /*IsReinject*/true);
1740  Tok.setKind(tok::semi);
1741  }
1742  } else
1743  TUK = Sema::TUK_Reference;
1744 
1745  // Forbid misplaced attributes. In cases of a reference, we pass attributes
1746  // to caller to handle.
1747  if (TUK != Sema::TUK_Reference) {
1748  // If this is not a reference, then the only possible
1749  // valid place for C++11 attributes to appear here
1750  // is between class-key and class-name. If there are
1751  // any attributes after class-name, we try a fixit to move
1752  // them to the right place.
1753  SourceRange AttrRange = Attributes.Range;
1754  if (AttrRange.isValid()) {
1755  Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
1756  << AttrRange
1757  << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
1758  CharSourceRange(AttrRange, true))
1759  << FixItHint::CreateRemoval(AttrRange);
1760 
1761  // Recover by adding misplaced attributes to the attribute list
1762  // of the class so they can be applied on the class later.
1763  attrs.takeAllFrom(Attributes);
1764  }
1765  }
1766 
1767  // If this is an elaborated type specifier, and we delayed
1768  // diagnostics before, just merge them into the current pool.
1769  if (shouldDelayDiagsInTag) {
1770  diagsFromTag.done();
1771  if (TUK == Sema::TUK_Reference)
1772  diagsFromTag.redelay();
1773  }
1774 
1775  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1776  TUK != Sema::TUK_Definition)) {
1777  if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1778  // We have a declaration or reference to an anonymous class.
1779  Diag(StartLoc, diag::err_anon_type_definition)
1780  << DeclSpec::getSpecifierName(TagType, Policy);
1781  }
1782 
1783  // If we are parsing a definition and stop at a base-clause, continue on
1784  // until the semicolon. Continuing from the comma will just trick us into
1785  // thinking we are seeing a variable declaration.
1786  if (TUK == Sema::TUK_Definition && Tok.is(tok::colon))
1787  SkipUntil(tok::semi, StopBeforeMatch);
1788  else
1789  SkipUntil(tok::comma, StopAtSemi);
1790  return;
1791  }
1792 
1793  // Create the tag portion of the class or class template.
1794  DeclResult TagOrTempResult = true; // invalid
1795  TypeResult TypeResult = true; // invalid
1796 
1797  bool Owned = false;
1798  Sema::SkipBodyInfo SkipBody;
1799  if (TemplateId) {
1800  // Explicit specialization, class template partial specialization,
1801  // or explicit instantiation.
1802  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1803  TemplateId->NumArgs);
1804  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1805  TUK == Sema::TUK_Declaration) {
1806  // This is an explicit instantiation of a class template.
1807  ProhibitAttributes(attrs);
1808 
1809  TagOrTempResult = Actions.ActOnExplicitInstantiation(
1810  getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
1811  TagType, StartLoc, SS, TemplateId->Template,
1812  TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr,
1813  TemplateId->RAngleLoc, attrs);
1814 
1815  // Friend template-ids are treated as references unless
1816  // they have template headers, in which case they're ill-formed
1817  // (FIXME: "template <class T> friend class A<T>::B<int>;").
1818  // We diagnose this error in ActOnClassTemplateSpecialization.
1819  } else if (TUK == Sema::TUK_Reference ||
1820  (TUK == Sema::TUK_Friend &&
1821  TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1822  ProhibitAttributes(attrs);
1823  TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1824  TemplateId->SS,
1825  TemplateId->TemplateKWLoc,
1826  TemplateId->Template,
1827  TemplateId->TemplateNameLoc,
1828  TemplateId->LAngleLoc,
1829  TemplateArgsPtr,
1830  TemplateId->RAngleLoc);
1831  } else {
1832  // This is an explicit specialization or a class template
1833  // partial specialization.
1834  TemplateParameterLists FakedParamLists;
1835  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1836  // This looks like an explicit instantiation, because we have
1837  // something like
1838  //
1839  // template class Foo<X>
1840  //
1841  // but it actually has a definition. Most likely, this was
1842  // meant to be an explicit specialization, but the user forgot
1843  // the '<>' after 'template'.
1844  // It this is friend declaration however, since it cannot have a
1845  // template header, it is most likely that the user meant to
1846  // remove the 'template' keyword.
1847  assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&
1848  "Expected a definition here");
1849 
1850  if (TUK == Sema::TUK_Friend) {
1851  Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation);
1852  TemplateParams = nullptr;
1853  } else {
1854  SourceLocation LAngleLoc =
1855  PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1856  Diag(TemplateId->TemplateNameLoc,
1857  diag::err_explicit_instantiation_with_definition)
1858  << SourceRange(TemplateInfo.TemplateLoc)
1859  << FixItHint::CreateInsertion(LAngleLoc, "<>");
1860 
1861  // Create a fake template parameter list that contains only
1862  // "template<>", so that we treat this construct as a class
1863  // template specialization.
1864  FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
1865  0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
1866  LAngleLoc, nullptr));
1867  TemplateParams = &FakedParamLists;
1868  }
1869  }
1870 
1871  // Build the class template specialization.
1872  TagOrTempResult = Actions.ActOnClassTemplateSpecialization(
1873  getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(),
1874  *TemplateId, attrs,
1875  MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0]
1876  : nullptr,
1877  TemplateParams ? TemplateParams->size() : 0),
1878  &SkipBody);
1879  }
1880  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1881  TUK == Sema::TUK_Declaration) {
1882  // Explicit instantiation of a member of a class template
1883  // specialization, e.g.,
1884  //
1885  // template struct Outer<int>::Inner;
1886  //
1887  ProhibitAttributes(attrs);
1888 
1889  TagOrTempResult = Actions.ActOnExplicitInstantiation(
1890  getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
1891  TagType, StartLoc, SS, Name, NameLoc, attrs);
1892  } else if (TUK == Sema::TUK_Friend &&
1893  TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1894  ProhibitAttributes(attrs);
1895 
1896  TagOrTempResult = Actions.ActOnTemplatedFriendTag(
1897  getCurScope(), DS.getFriendSpecLoc(), TagType, StartLoc, SS, Name,
1898  NameLoc, attrs,
1899  MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0] : nullptr,
1900  TemplateParams ? TemplateParams->size() : 0));
1901  } else {
1902  if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1903  ProhibitAttributes(attrs);
1904 
1905  if (TUK == Sema::TUK_Definition &&
1906  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1907  // If the declarator-id is not a template-id, issue a diagnostic and
1908  // recover by ignoring the 'template' keyword.
1909  Diag(Tok, diag::err_template_defn_explicit_instantiation)
1910  << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
1911  TemplateParams = nullptr;
1912  }
1913 
1914  bool IsDependent = false;
1915 
1916  // Don't pass down template parameter lists if this is just a tag
1917  // reference. For example, we don't need the template parameters here:
1918  // template <class T> class A *makeA(T t);
1919  MultiTemplateParamsArg TParams;
1920  if (TUK != Sema::TUK_Reference && TemplateParams)
1921  TParams =
1922  MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1923 
1924  stripTypeAttributesOffDeclSpec(attrs, DS, TUK);
1925 
1926  // Declaration or definition of a class type
1927  TagOrTempResult = Actions.ActOnTag(
1928  getCurScope(), TagType, TUK, StartLoc, SS, Name, NameLoc, attrs, AS,
1929  DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent,
1930  SourceLocation(), false, clang::TypeResult(),
1931  DSC == DeclSpecContext::DSC_type_specifier,
1932  DSC == DeclSpecContext::DSC_template_param ||
1933  DSC == DeclSpecContext::DSC_template_type_arg,
1934  &SkipBody);
1935 
1936  // If ActOnTag said the type was dependent, try again with the
1937  // less common call.
1938  if (IsDependent) {
1939  assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1940  TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1941  SS, Name, StartLoc, NameLoc);
1942  }
1943  }
1944 
1945  // If there is a body, parse it and inform the actions module.
1946  if (TUK == Sema::TUK_Definition) {
1947  assert(Tok.is(tok::l_brace) ||
1948  (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1949  isCXX11FinalKeyword());
1950  if (SkipBody.ShouldSkip)
1951  SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType,
1952  TagOrTempResult.get());
1953  else if (getLangOpts().CPlusPlus)
1954  ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
1955  TagOrTempResult.get());
1956  else {
1957  Decl *D =
1958  SkipBody.CheckSameAsPrevious ? SkipBody.New : TagOrTempResult.get();
1959  // Parse the definition body.
1960  ParseStructUnionBody(StartLoc, TagType, D);
1961  if (SkipBody.CheckSameAsPrevious &&
1962  !Actions.ActOnDuplicateDefinition(DS, TagOrTempResult.get(),
1963  SkipBody)) {
1964  DS.SetTypeSpecError();
1965  return;
1966  }
1967  }
1968  }
1969 
1970  if (!TagOrTempResult.isInvalid())
1971  // Delayed processing of attributes.
1972  Actions.ProcessDeclAttributeDelayed(TagOrTempResult.get(), attrs);
1973 
1974  const char *PrevSpec = nullptr;
1975  unsigned DiagID;
1976  bool Result;
1977  if (!TypeResult.isInvalid()) {
1978  Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1979  NameLoc.isValid() ? NameLoc : StartLoc,
1980  PrevSpec, DiagID, TypeResult.get(), Policy);
1981  } else if (!TagOrTempResult.isInvalid()) {
1982  Result = DS.SetTypeSpecType(TagType, StartLoc,
1983  NameLoc.isValid() ? NameLoc : StartLoc,
1984  PrevSpec, DiagID, TagOrTempResult.get(), Owned,
1985  Policy);
1986  } else {
1987  DS.SetTypeSpecError();
1988  return;
1989  }
1990 
1991  if (Result)
1992  Diag(StartLoc, DiagID) << PrevSpec;
1993 
1994  // At this point, we've successfully parsed a class-specifier in 'definition'
1995  // form (e.g. "struct foo { int x; }". While we could just return here, we're
1996  // going to look at what comes after it to improve error recovery. If an
1997  // impossible token occurs next, we assume that the programmer forgot a ; at
1998  // the end of the declaration and recover that way.
1999  //
2000  // Also enforce C++ [temp]p3:
2001  // In a template-declaration which defines a class, no declarator
2002  // is permitted.
2003  //
2004  // After a type-specifier, we don't expect a semicolon. This only happens in
2005  // C, since definitions are not permitted in this context in C++.
2006  if (TUK == Sema::TUK_Definition &&
2007  (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) &&
2008  (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
2009  if (Tok.isNot(tok::semi)) {
2010  const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
2011  ExpectAndConsume(tok::semi, diag::err_expected_after,
2012  DeclSpec::getSpecifierName(TagType, PPol));
2013  // Push this token back into the preprocessor and change our current token
2014  // to ';' so that the rest of the code recovers as though there were an
2015  // ';' after the definition.
2016  PP.EnterToken(Tok, /*IsReinject=*/true);
2017  Tok.setKind(tok::semi);
2018  }
2019  }
2020 }
2021 
2022 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
2023 ///
2024 /// base-clause : [C++ class.derived]
2025 /// ':' base-specifier-list
2026 /// base-specifier-list:
2027 /// base-specifier '...'[opt]
2028 /// base-specifier-list ',' base-specifier '...'[opt]
2029 void Parser::ParseBaseClause(Decl *ClassDecl) {
2030  assert(Tok.is(tok::colon) && "Not a base clause");
2031  ConsumeToken();
2032 
2033  // Build up an array of parsed base specifiers.
2035 
2036  while (true) {
2037  // Parse a base-specifier.
2038  BaseResult Result = ParseBaseSpecifier(ClassDecl);
2039  if (Result.isInvalid()) {
2040  // Skip the rest of this base specifier, up until the comma or
2041  // opening brace.
2042  SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch);
2043  } else {
2044  // Add this to our array of base specifiers.
2045  BaseInfo.push_back(Result.get());
2046  }
2047 
2048  // If the next token is a comma, consume it and keep reading
2049  // base-specifiers.
2050  if (!TryConsumeToken(tok::comma))
2051  break;
2052  }
2053 
2054  // Attach the base specifiers
2055  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo);
2056 }
2057 
2058 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
2059 /// one entry in the base class list of a class specifier, for example:
2060 /// class foo : public bar, virtual private baz {
2061 /// 'public bar' and 'virtual private baz' are each base-specifiers.
2062 ///
2063 /// base-specifier: [C++ class.derived]
2064 /// attribute-specifier-seq[opt] base-type-specifier
2065 /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
2066 /// base-type-specifier
2067 /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
2068 /// base-type-specifier
2069 BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
2070  bool IsVirtual = false;
2071  SourceLocation StartLoc = Tok.getLocation();
2072 
2073  ParsedAttributesWithRange Attributes(AttrFactory);
2074  MaybeParseCXX11Attributes(Attributes);
2075 
2076  // Parse the 'virtual' keyword.
2077  if (TryConsumeToken(tok::kw_virtual))
2078  IsVirtual = true;
2079 
2080  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2081 
2082  // Parse an (optional) access specifier.
2083  AccessSpecifier Access = getAccessSpecifierIfPresent();
2084  if (Access != AS_none)
2085  ConsumeToken();
2086 
2087  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2088 
2089  // Parse the 'virtual' keyword (again!), in case it came after the
2090  // access specifier.
2091  if (Tok.is(tok::kw_virtual)) {
2092  SourceLocation VirtualLoc = ConsumeToken();
2093  if (IsVirtual) {
2094  // Complain about duplicate 'virtual'
2095  Diag(VirtualLoc, diag::err_dup_virtual)
2096  << FixItHint::CreateRemoval(VirtualLoc);
2097  }
2098 
2099  IsVirtual = true;
2100  }
2101 
2102  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2103 
2104  // Parse the class-name.
2105 
2106  // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
2107  // implementation for VS2013 uses _Atomic as an identifier for one of the
2108  // classes in <atomic>. Treat '_Atomic' to be an identifier when we are
2109  // parsing the class-name for a base specifier.
2110  if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
2111  NextToken().is(tok::less))
2112  Tok.setKind(tok::identifier);
2113 
2114  SourceLocation EndLocation;
2115  SourceLocation BaseLoc;
2116  TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
2117  if (BaseType.isInvalid())
2118  return true;
2119 
2120  // Parse the optional ellipsis (for a pack expansion). The ellipsis is
2121  // actually part of the base-specifier-list grammar productions, but we
2122  // parse it here for convenience.
2123  SourceLocation EllipsisLoc;
2124  TryConsumeToken(tok::ellipsis, EllipsisLoc);
2125 
2126  // Find the complete source range for the base-specifier.
2127  SourceRange Range(StartLoc, EndLocation);
2128 
2129  // Notify semantic analysis that we have parsed a complete
2130  // base-specifier.
2131  return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
2132  Access, BaseType.get(), BaseLoc,
2133  EllipsisLoc);
2134 }
2135 
2136 /// getAccessSpecifierIfPresent - Determine whether the next token is
2137 /// a C++ access-specifier.
2138 ///
2139 /// access-specifier: [C++ class.derived]
2140 /// 'private'
2141 /// 'protected'
2142 /// 'public'
2143 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
2144  switch (Tok.getKind()) {
2145  default: return AS_none;
2146  case tok::kw_private: return AS_private;
2147  case tok::kw_protected: return AS_protected;
2148  case tok::kw_public: return AS_public;
2149  }
2150 }
2151 
2152 /// If the given declarator has any parts for which parsing has to be
2153 /// delayed, e.g., default arguments or an exception-specification, create a
2154 /// late-parsed method declaration record to handle the parsing at the end of
2155 /// the class definition.
2156 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
2157  Decl *ThisDecl) {
2159  = DeclaratorInfo.getFunctionTypeInfo();
2160  // If there was a late-parsed exception-specification, we'll need a
2161  // late parse
2162  bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed;
2163 
2164  if (!NeedLateParse) {
2165  // Look ahead to see if there are any default args
2166  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) {
2167  auto Param = cast<ParmVarDecl>(FTI.Params[ParamIdx].Param);
2168  if (Param->hasUnparsedDefaultArg()) {
2169  NeedLateParse = true;
2170  break;
2171  }
2172  }
2173  }
2174 
2175  if (NeedLateParse) {
2176  // Push this method onto the stack of late-parsed method
2177  // declarations.
2178  auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
2179  getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
2180  LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
2181 
2182  // Stash the exception-specification tokens in the late-pased method.
2183  LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
2184  FTI.ExceptionSpecTokens = nullptr;
2185 
2186  // Push tokens for each parameter. Those that do not have
2187  // defaults will be NULL.
2188  LateMethod->DefaultArgs.reserve(FTI.NumParams);
2189  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx)
2190  LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument(
2191  FTI.Params[ParamIdx].Param,
2192  std::move(FTI.Params[ParamIdx].DefaultArgTokens)));
2193  }
2194 }
2195 
2196 /// isCXX11VirtSpecifier - Determine whether the given token is a C++11
2197 /// virt-specifier.
2198 ///
2199 /// virt-specifier:
2200 /// override
2201 /// final
2202 /// __final
2203 VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
2204  if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier))
2205  return VirtSpecifiers::VS_None;
2206 
2207  IdentifierInfo *II = Tok.getIdentifierInfo();
2208 
2209  // Initialize the contextual keywords.
2210  if (!Ident_final) {
2211  Ident_final = &PP.getIdentifierTable().get("final");
2212  if (getLangOpts().GNUKeywords)
2213  Ident_GNU_final = &PP.getIdentifierTable().get("__final");
2214  if (getLangOpts().MicrosoftExt)
2215  Ident_sealed = &PP.getIdentifierTable().get("sealed");
2216  Ident_override = &PP.getIdentifierTable().get("override");
2217  }
2218 
2219  if (II == Ident_override)
2221 
2222  if (II == Ident_sealed)
2224 
2225  if (II == Ident_final)
2226  return VirtSpecifiers::VS_Final;
2227 
2228  if (II == Ident_GNU_final)
2230 
2231  return VirtSpecifiers::VS_None;
2232 }
2233 
2234 /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
2235 ///
2236 /// virt-specifier-seq:
2237 /// virt-specifier
2238 /// virt-specifier-seq virt-specifier
2239 void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
2240  bool IsInterface,
2241  SourceLocation FriendLoc) {
2242  while (true) {
2243  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2244  if (Specifier == VirtSpecifiers::VS_None)
2245  return;
2246 
2247  if (FriendLoc.isValid()) {
2248  Diag(Tok.getLocation(), diag::err_friend_decl_spec)
2249  << VirtSpecifiers::getSpecifierName(Specifier)
2251  << SourceRange(FriendLoc, FriendLoc);
2252  ConsumeToken();
2253  continue;
2254  }
2255 
2256  // C++ [class.mem]p8:
2257  // A virt-specifier-seq shall contain at most one of each virt-specifier.
2258  const char *PrevSpec = nullptr;
2259  if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
2260  Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
2261  << PrevSpec
2263 
2264  if (IsInterface && (Specifier == VirtSpecifiers::VS_Final ||
2265  Specifier == VirtSpecifiers::VS_Sealed)) {
2266  Diag(Tok.getLocation(), diag::err_override_control_interface)
2267  << VirtSpecifiers::getSpecifierName(Specifier);
2268  } else if (Specifier == VirtSpecifiers::VS_Sealed) {
2269  Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword);
2270  } else if (Specifier == VirtSpecifiers::VS_GNU_Final) {
2271  Diag(Tok.getLocation(), diag::ext_warn_gnu_final);
2272  } else {
2273  Diag(Tok.getLocation(),
2274  getLangOpts().CPlusPlus11
2275  ? diag::warn_cxx98_compat_override_control_keyword
2276  : diag::ext_override_control_keyword)
2277  << VirtSpecifiers::getSpecifierName(Specifier);
2278  }
2279  ConsumeToken();
2280  }
2281 }
2282 
2283 /// isCXX11FinalKeyword - Determine whether the next token is a C++11
2284 /// 'final' or Microsoft 'sealed' contextual keyword.
2285 bool Parser::isCXX11FinalKeyword() const {
2286  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2287  return Specifier == VirtSpecifiers::VS_Final ||
2288  Specifier == VirtSpecifiers::VS_GNU_Final ||
2289  Specifier == VirtSpecifiers::VS_Sealed;
2290 }
2291 
2292 /// Parse a C++ member-declarator up to, but not including, the optional
2293 /// brace-or-equal-initializer or pure-specifier.
2294 bool Parser::ParseCXXMemberDeclaratorBeforeInitializer(
2295  Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize,
2296  LateParsedAttrList &LateParsedAttrs) {
2297  // member-declarator:
2298  // declarator pure-specifier[opt]
2299  // declarator brace-or-equal-initializer[opt]
2300  // identifier[opt] ':' constant-expression
2301  if (Tok.isNot(tok::colon))
2302  ParseDeclarator(DeclaratorInfo);
2303  else
2304  DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation());
2305 
2306  if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) {
2307  assert(DeclaratorInfo.isPastIdentifier() &&
2308  "don't know where identifier would go yet?");
2309  BitfieldSize = ParseConstantExpression();
2310  if (BitfieldSize.isInvalid())
2311  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2312  } else {
2313  ParseOptionalCXX11VirtSpecifierSeq(
2314  VS, getCurrentClass().IsInterface,
2315  DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2316  if (!VS.isUnset())
2317  MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2318  }
2319 
2320  // If a simple-asm-expr is present, parse it.
2321  if (Tok.is(tok::kw_asm)) {
2322  SourceLocation Loc;
2323  ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2324  if (AsmLabel.isInvalid())
2325  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2326 
2327  DeclaratorInfo.setAsmLabel(AsmLabel.get());
2328  DeclaratorInfo.SetRangeEnd(Loc);
2329  }
2330 
2331  // If attributes exist after the declarator, but before an '{', parse them.
2332  MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2333 
2334  // For compatibility with code written to older Clang, also accept a
2335  // virt-specifier *after* the GNU attributes.
2336  if (BitfieldSize.isUnset() && VS.isUnset()) {
2337  ParseOptionalCXX11VirtSpecifierSeq(
2338  VS, getCurrentClass().IsInterface,
2339  DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2340  if (!VS.isUnset()) {
2341  // If we saw any GNU-style attributes that are known to GCC followed by a
2342  // virt-specifier, issue a GCC-compat warning.
2343  for (const ParsedAttr &AL : DeclaratorInfo.getAttributes())
2344  if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
2345  Diag(AL.getLoc(), diag::warn_gcc_attribute_location);
2346 
2347  MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2348  }
2349  }
2350 
2351  // If this has neither a name nor a bit width, something has gone seriously
2352  // wrong. Skip until the semi-colon or }.
2353  if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) {
2354  // If so, skip until the semi-colon or a }.
2355  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2356  return true;
2357  }
2358  return false;
2359 }
2360 
2361 /// Look for declaration specifiers possibly occurring after C++11
2362 /// virt-specifier-seq and diagnose them.
2363 void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(
2364  Declarator &D,
2365  VirtSpecifiers &VS) {
2366  DeclSpec DS(AttrFactory);
2367 
2368  // GNU-style and C++11 attributes are not allowed here, but they will be
2369  // handled by the caller. Diagnose everything else.
2370  ParseTypeQualifierListOpt(
2371  DS, AR_NoAttributesParsed, false,
2372  /*IdentifierRequired=*/false, llvm::function_ref<void()>([&]() {
2373  Actions.CodeCompleteFunctionQualifiers(DS, D, &VS);
2374  }));
2375  D.ExtendWithDeclSpec(DS);
2376 
2377  if (D.isFunctionDeclarator()) {
2378  auto &Function = D.getFunctionTypeInfo();
2380  auto DeclSpecCheck = [&](DeclSpec::TQ TypeQual, StringRef FixItName,
2381  SourceLocation SpecLoc) {
2382  FixItHint Insertion;
2383  auto &MQ = Function.getOrCreateMethodQualifiers();
2384  if (!(MQ.getTypeQualifiers() & TypeQual)) {
2385  std::string Name(FixItName.data());
2386  Name += " ";
2387  Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2388  MQ.SetTypeQual(TypeQual, SpecLoc);
2389  }
2390  Diag(SpecLoc, diag::err_declspec_after_virtspec)
2391  << FixItName
2393  << FixItHint::CreateRemoval(SpecLoc) << Insertion;
2394  };
2395  DS.forEachQualifier(DeclSpecCheck);
2396  }
2397 
2398  // Parse ref-qualifiers.
2399  bool RefQualifierIsLValueRef = true;
2400  SourceLocation RefQualifierLoc;
2401  if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) {
2402  const char *Name = (RefQualifierIsLValueRef ? "& " : "&& ");
2403  FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2404  Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef;
2405  Function.RefQualifierLoc = RefQualifierLoc.getRawEncoding();
2406 
2407  Diag(RefQualifierLoc, diag::err_declspec_after_virtspec)
2408  << (RefQualifierIsLValueRef ? "&" : "&&")
2410  << FixItHint::CreateRemoval(RefQualifierLoc)
2411  << Insertion;
2412  D.SetRangeEnd(RefQualifierLoc);
2413  }
2414  }
2415 }
2416 
2417 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
2418 ///
2419 /// member-declaration:
2420 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
2421 /// function-definition ';'[opt]
2422 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
2423 /// using-declaration [TODO]
2424 /// [C++0x] static_assert-declaration
2425 /// template-declaration
2426 /// [GNU] '__extension__' member-declaration
2427 ///
2428 /// member-declarator-list:
2429 /// member-declarator
2430 /// member-declarator-list ',' member-declarator
2431 ///
2432 /// member-declarator:
2433 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
2434 /// declarator constant-initializer[opt]
2435 /// [C++11] declarator brace-or-equal-initializer[opt]
2436 /// identifier[opt] ':' constant-expression
2437 ///
2438 /// virt-specifier-seq:
2439 /// virt-specifier
2440 /// virt-specifier-seq virt-specifier
2441 ///
2442 /// virt-specifier:
2443 /// override
2444 /// final
2445 /// [MS] sealed
2446 ///
2447 /// pure-specifier:
2448 /// '= 0'
2449 ///
2450 /// constant-initializer:
2451 /// '=' constant-expression
2452 ///
2454 Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
2455  ParsedAttributes &AccessAttrs,
2456  const ParsedTemplateInfo &TemplateInfo,
2457  ParsingDeclRAIIObject *TemplateDiags) {
2458  if (Tok.is(tok::at)) {
2459  if (getLangOpts().ObjC && NextToken().isObjCAtKeyword(tok::objc_defs))
2460  Diag(Tok, diag::err_at_defs_cxx);
2461  else
2462  Diag(Tok, diag::err_at_in_class);
2463 
2464  ConsumeToken();
2465  SkipUntil(tok::r_brace, StopAtSemi);
2466  return nullptr;
2467  }
2468 
2469  // Turn on colon protection early, while parsing declspec, although there is
2470  // nothing to protect there. It prevents from false errors if error recovery
2471  // incorrectly determines where the declspec ends, as in the example:
2472  // struct A { enum class B { C }; };
2473  // const int C = 4;
2474  // struct D { A::B : C; };
2476 
2477  // Access declarations.
2478  bool MalformedTypeSpec = false;
2479  if (!TemplateInfo.Kind &&
2480  Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
2482  MalformedTypeSpec = true;
2483 
2484  bool isAccessDecl;
2485  if (Tok.isNot(tok::annot_cxxscope))
2486  isAccessDecl = false;
2487  else if (NextToken().is(tok::identifier))
2488  isAccessDecl = GetLookAheadToken(2).is(tok::semi);
2489  else
2490  isAccessDecl = NextToken().is(tok::kw_operator);
2491 
2492  if (isAccessDecl) {
2493  // Collect the scope specifier token we annotated earlier.
2494  CXXScopeSpec SS;
2495  ParseOptionalCXXScopeSpecifier(SS, nullptr,
2496  /*EnteringContext=*/false);
2497 
2498  if (SS.isInvalid()) {
2499  SkipUntil(tok::semi);
2500  return nullptr;
2501  }
2502 
2503  // Try to parse an unqualified-id.
2504  SourceLocation TemplateKWLoc;
2505  UnqualifiedId Name;
2506  if (ParseUnqualifiedId(SS, false, true, true, false, nullptr,
2507  &TemplateKWLoc, Name)) {
2508  SkipUntil(tok::semi);
2509  return nullptr;
2510  }
2511 
2512  // TODO: recover from mistakenly-qualified operator declarations.
2513  if (ExpectAndConsume(tok::semi, diag::err_expected_after,
2514  "access declaration")) {
2515  SkipUntil(tok::semi);
2516  return nullptr;
2517  }
2518 
2519  // FIXME: We should do something with the 'template' keyword here.
2520  return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration(
2521  getCurScope(), AS, /*UsingLoc*/ SourceLocation(),
2522  /*TypenameLoc*/ SourceLocation(), SS, Name,
2523  /*EllipsisLoc*/ SourceLocation(),
2524  /*AttrList*/ ParsedAttributesView())));
2525  }
2526  }
2527 
2528  // static_assert-declaration. A templated static_assert declaration is
2529  // diagnosed in Parser::ParseSingleDeclarationAfterTemplate.
2530  if (!TemplateInfo.Kind &&
2531  Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) {
2532  SourceLocation DeclEnd;
2533  return DeclGroupPtrTy::make(
2534  DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd)));
2535  }
2536 
2537  if (Tok.is(tok::kw_template)) {
2538  assert(!TemplateInfo.TemplateParams &&
2539  "Nested template improperly parsed?");
2540  ObjCDeclContextSwitch ObjCDC(*this);
2541  SourceLocation DeclEnd;
2542  return DeclGroupPtrTy::make(
2543  DeclGroupRef(ParseTemplateDeclarationOrSpecialization(
2544  DeclaratorContext::MemberContext, DeclEnd, AccessAttrs, AS)));
2545  }
2546 
2547  // Handle: member-declaration ::= '__extension__' member-declaration
2548  if (Tok.is(tok::kw___extension__)) {
2549  // __extension__ silences extension warnings in the subexpression.
2550  ExtensionRAIIObject O(Diags); // Use RAII to do this.
2551  ConsumeToken();
2552  return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
2553  TemplateInfo, TemplateDiags);
2554  }
2555 
2556  ParsedAttributesWithRange attrs(AttrFactory);
2557  ParsedAttributesViewWithRange FnAttrs;
2558  // Optional C++11 attribute-specifier
2559  MaybeParseCXX11Attributes(attrs);
2560  // We need to keep these attributes for future diagnostic
2561  // before they are taken over by declaration specifier.
2562  FnAttrs.addAll(attrs.begin(), attrs.end());
2563  FnAttrs.Range = attrs.Range;
2564 
2565  MaybeParseMicrosoftAttributes(attrs);
2566 
2567  if (Tok.is(tok::kw_using)) {
2568  ProhibitAttributes(attrs);
2569 
2570  // Eat 'using'.
2571  SourceLocation UsingLoc = ConsumeToken();
2572 
2573  // Consume unexpected 'template' keywords.
2574  while (Tok.is(tok::kw_template)) {
2575  SourceLocation TemplateLoc = ConsumeToken();
2576  Diag(TemplateLoc, diag::err_unexpected_template_after_using)
2577  << FixItHint::CreateRemoval(TemplateLoc);
2578  }
2579 
2580  if (Tok.is(tok::kw_namespace)) {
2581  Diag(UsingLoc, diag::err_using_namespace_in_class);
2582  SkipUntil(tok::semi, StopBeforeMatch);
2583  return nullptr;
2584  }
2585  SourceLocation DeclEnd;
2586  // Otherwise, it must be a using-declaration or an alias-declaration.
2587  return ParseUsingDeclaration(DeclaratorContext::MemberContext, TemplateInfo,
2588  UsingLoc, DeclEnd, AS);
2589  }
2590 
2591  // Hold late-parsed attributes so we can attach a Decl to them later.
2592  LateParsedAttrList CommonLateParsedAttrs;
2593 
2594  // decl-specifier-seq:
2595  // Parse the common declaration-specifiers piece.
2596  ParsingDeclSpec DS(*this, TemplateDiags);
2597  DS.takeAttributesFrom(attrs);
2598  if (MalformedTypeSpec)
2599  DS.SetTypeSpecError();
2600 
2601  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DeclSpecContext::DSC_class,
2602  &CommonLateParsedAttrs);
2603 
2604  // Turn off colon protection that was set for declspec.
2605  X.restore();
2606 
2607  // If we had a free-standing type definition with a missing semicolon, we
2608  // may get this far before the problem becomes obvious.
2609  if (DS.hasTagDefinition() &&
2610  TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate &&
2611  DiagnoseMissingSemiAfterTagDefinition(DS, AS, DeclSpecContext::DSC_class,
2612  &CommonLateParsedAttrs))
2613  return nullptr;
2614 
2615  MultiTemplateParamsArg TemplateParams(
2616  TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data()
2617  : nullptr,
2618  TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
2619 
2620  if (TryConsumeToken(tok::semi)) {
2621  if (DS.isFriendSpecified())
2622  ProhibitAttributes(FnAttrs);
2623 
2624  RecordDecl *AnonRecord = nullptr;
2625  Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
2626  getCurScope(), AS, DS, TemplateParams, false, AnonRecord);
2627  DS.complete(TheDecl);
2628  if (AnonRecord) {
2629  Decl* decls[] = {AnonRecord, TheDecl};
2630  return Actions.BuildDeclaratorGroup(decls);
2631  }
2632  return Actions.ConvertDeclToDeclGroup(TheDecl);
2633  }
2634 
2635  ParsingDeclarator DeclaratorInfo(*this, DS, DeclaratorContext::MemberContext);
2636  VirtSpecifiers VS;
2637 
2638  // Hold late-parsed attributes so we can attach a Decl to them later.
2639  LateParsedAttrList LateParsedAttrs;
2640 
2641  SourceLocation EqualLoc;
2642  SourceLocation PureSpecLoc;
2643 
2644  auto TryConsumePureSpecifier = [&] (bool AllowDefinition) {
2645  if (Tok.isNot(tok::equal))
2646  return false;
2647 
2648  auto &Zero = NextToken();
2649  SmallString<8> Buffer;
2650  if (Zero.isNot(tok::numeric_constant) || Zero.getLength() != 1 ||
2651  PP.getSpelling(Zero, Buffer) != "0")
2652  return false;
2653 
2654  auto &After = GetLookAheadToken(2);
2655  if (!After.isOneOf(tok::semi, tok::comma) &&
2656  !(AllowDefinition &&
2657  After.isOneOf(tok::l_brace, tok::colon, tok::kw_try)))
2658  return false;
2659 
2660  EqualLoc = ConsumeToken();
2661  PureSpecLoc = ConsumeToken();
2662  return true;
2663  };
2664 
2665  SmallVector<Decl *, 8> DeclsInGroup;
2666  ExprResult BitfieldSize;
2667  bool ExpectSemi = true;
2668 
2669  // Parse the first declarator.
2670  if (ParseCXXMemberDeclaratorBeforeInitializer(
2671  DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) {
2672  TryConsumeToken(tok::semi);
2673  return nullptr;
2674  }
2675 
2676  // Check for a member function definition.
2677  if (BitfieldSize.isUnset()) {
2678  // MSVC permits pure specifier on inline functions defined at class scope.
2679  // Hence check for =0 before checking for function definition.
2680  if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction())
2681  TryConsumePureSpecifier(/*AllowDefinition*/ true);
2682 
2683  FunctionDefinitionKind DefinitionKind = FDK_Declaration;
2684  // function-definition:
2685  //
2686  // In C++11, a non-function declarator followed by an open brace is a
2687  // braced-init-list for an in-class member initialization, not an
2688  // erroneous function definition.
2689  if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
2690  DefinitionKind = FDK_Definition;
2691  } else if (DeclaratorInfo.isFunctionDeclarator()) {
2692  if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) {
2693  DefinitionKind = FDK_Definition;
2694  } else if (Tok.is(tok::equal)) {
2695  const Token &KW = NextToken();
2696  if (KW.is(tok::kw_default))
2697  DefinitionKind = FDK_Defaulted;
2698  else if (KW.is(tok::kw_delete))
2699  DefinitionKind = FDK_Deleted;
2700  }
2701  }
2702  DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind);
2703 
2704  // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2705  // to a friend declaration, that declaration shall be a definition.
2706  if (DeclaratorInfo.isFunctionDeclarator() &&
2707  DefinitionKind != FDK_Definition && DS.isFriendSpecified()) {
2708  // Diagnose attributes that appear before decl specifier:
2709  // [[]] friend int foo();
2710  ProhibitAttributes(FnAttrs);
2711  }
2712 
2713  if (DefinitionKind != FDK_Declaration) {
2714  if (!DeclaratorInfo.isFunctionDeclarator()) {
2715  Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
2716  ConsumeBrace();
2717  SkipUntil(tok::r_brace);
2718 
2719  // Consume the optional ';'
2720  TryConsumeToken(tok::semi);
2721 
2722  return nullptr;
2723  }
2724 
2726  Diag(DeclaratorInfo.getIdentifierLoc(),
2727  diag::err_function_declared_typedef);
2728 
2729  // Recover by treating the 'typedef' as spurious.
2731  }
2732 
2733  Decl *FunDecl =
2734  ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
2735  VS, PureSpecLoc);
2736 
2737  if (FunDecl) {
2738  for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2739  CommonLateParsedAttrs[i]->addDecl(FunDecl);
2740  }
2741  for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2742  LateParsedAttrs[i]->addDecl(FunDecl);
2743  }
2744  }
2745  LateParsedAttrs.clear();
2746 
2747  // Consume the ';' - it's optional unless we have a delete or default
2748  if (Tok.is(tok::semi))
2749  ConsumeExtraSemi(AfterMemberFunctionDefinition);
2750 
2751  return DeclGroupPtrTy::make(DeclGroupRef(FunDecl));
2752  }
2753  }
2754 
2755  // member-declarator-list:
2756  // member-declarator
2757  // member-declarator-list ',' member-declarator
2758 
2759  while (1) {
2760  InClassInitStyle HasInClassInit = ICIS_NoInit;
2761  bool HasStaticInitializer = false;
2762  if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
2763  if (DeclaratorInfo.isDeclarationOfFunction()) {
2764  // It's a pure-specifier.
2765  if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false))
2766  // Parse it as an expression so that Sema can diagnose it.
2767  HasStaticInitializer = true;
2768  } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2770  DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2772  !DS.isFriendSpecified()) {
2773  // It's a default member initializer.
2774  if (BitfieldSize.get())
2775  Diag(Tok, getLangOpts().CPlusPlus2a
2776  ? diag::warn_cxx17_compat_bitfield_member_init
2777  : diag::ext_bitfield_member_init);
2778  HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2779  } else {
2780  HasStaticInitializer = true;
2781  }
2782  }
2783 
2784  // NOTE: If Sema is the Action module and declarator is an instance field,
2785  // this call will *not* return the created decl; It will return null.
2786  // See Sema::ActOnCXXMemberDeclarator for details.
2787 
2788  NamedDecl *ThisDecl = nullptr;
2789  if (DS.isFriendSpecified()) {
2790  // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2791  // to a friend declaration, that declaration shall be a definition.
2792  //
2793  // Diagnose attributes that appear in a friend member function declarator:
2794  // friend int foo [[]] ();
2796  DeclaratorInfo.getCXX11AttributeRanges(Ranges);
2797  for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
2798  E = Ranges.end(); I != E; ++I)
2799  Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I;
2800 
2801  ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2802  TemplateParams);
2803  } else {
2804  ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2805  DeclaratorInfo,
2806  TemplateParams,
2807  BitfieldSize.get(),
2808  VS, HasInClassInit);
2809 
2810  if (VarTemplateDecl *VT =
2811  ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : nullptr)
2812  // Re-direct this decl to refer to the templated decl so that we can
2813  // initialize it.
2814  ThisDecl = VT->getTemplatedDecl();
2815 
2816  if (ThisDecl)
2817  Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs);
2818  }
2819 
2820  // Error recovery might have converted a non-static member into a static
2821  // member.
2822  if (HasInClassInit != ICIS_NoInit &&
2823  DeclaratorInfo.getDeclSpec().getStorageClassSpec() ==
2825  HasInClassInit = ICIS_NoInit;
2826  HasStaticInitializer = true;
2827  }
2828 
2829  if (ThisDecl && PureSpecLoc.isValid())
2830  Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc);
2831 
2832  // Handle the initializer.
2833  if (HasInClassInit != ICIS_NoInit) {
2834  // The initializer was deferred; parse it and cache the tokens.
2836  ? diag::warn_cxx98_compat_nonstatic_member_init
2837  : diag::ext_nonstatic_member_init);
2838 
2839  if (DeclaratorInfo.isArrayOfUnknownBound()) {
2840  // C++11 [dcl.array]p3: An array bound may also be omitted when the
2841  // declarator is followed by an initializer.
2842  //
2843  // A brace-or-equal-initializer for a member-declarator is not an
2844  // initializer in the grammar, so this is ill-formed.
2845  Diag(Tok, diag::err_incomplete_array_member_init);
2846  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2847 
2848  // Avoid later warnings about a class member of incomplete type.
2849  if (ThisDecl)
2850  ThisDecl->setInvalidDecl();
2851  } else
2852  ParseCXXNonStaticMemberInitializer(ThisDecl);
2853  } else if (HasStaticInitializer) {
2854  // Normal initializer.
2855  ExprResult Init = ParseCXXMemberInitializer(
2856  ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2857 
2858  if (Init.isInvalid())
2859  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2860  else if (ThisDecl)
2861  Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid());
2862  } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
2863  // No initializer.
2864  Actions.ActOnUninitializedDecl(ThisDecl);
2865 
2866  if (ThisDecl) {
2867  if (!ThisDecl->isInvalidDecl()) {
2868  // Set the Decl for any late parsed attributes
2869  for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
2870  CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2871 
2872  for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
2873  LateParsedAttrs[i]->addDecl(ThisDecl);
2874  }
2875  Actions.FinalizeDeclaration(ThisDecl);
2876  DeclsInGroup.push_back(ThisDecl);
2877 
2878  if (DeclaratorInfo.isFunctionDeclarator() &&
2879  DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2881  HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2882  }
2883  LateParsedAttrs.clear();
2884 
2885  DeclaratorInfo.complete(ThisDecl);
2886 
2887  // If we don't have a comma, it is either the end of the list (a ';')
2888  // or an error, bail out.
2889  SourceLocation CommaLoc;
2890  if (!TryConsumeToken(tok::comma, CommaLoc))
2891  break;
2892 
2893  if (Tok.isAtStartOfLine() &&
2894  !MightBeDeclarator(DeclaratorContext::MemberContext)) {
2895  // This comma was followed by a line-break and something which can't be
2896  // the start of a declarator. The comma was probably a typo for a
2897  // semicolon.
2898  Diag(CommaLoc, diag::err_expected_semi_declaration)
2899  << FixItHint::CreateReplacement(CommaLoc, ";");
2900  ExpectSemi = false;
2901  break;
2902  }
2903 
2904  // Parse the next declarator.
2905  DeclaratorInfo.clear();
2906  VS.clear();
2907  BitfieldSize = ExprResult(/*Invalid=*/false);
2908  EqualLoc = PureSpecLoc = SourceLocation();
2909  DeclaratorInfo.setCommaLoc(CommaLoc);
2910 
2911  // GNU attributes are allowed before the second and subsequent declarator.
2912  MaybeParseGNUAttributes(DeclaratorInfo);
2913 
2914  if (ParseCXXMemberDeclaratorBeforeInitializer(
2915  DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs))
2916  break;
2917  }
2918 
2919  if (ExpectSemi &&
2920  ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2921  // Skip to end of block or statement.
2922  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2923  // If we stopped at a ';', eat it.
2924  TryConsumeToken(tok::semi);
2925  return nullptr;
2926  }
2927 
2928  return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2929 }
2930 
2931 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer.
2932 /// Also detect and reject any attempted defaulted/deleted function definition.
2933 /// The location of the '=', if any, will be placed in EqualLoc.
2934 ///
2935 /// This does not check for a pure-specifier; that's handled elsewhere.
2936 ///
2937 /// brace-or-equal-initializer:
2938 /// '=' initializer-expression
2939 /// braced-init-list
2940 ///
2941 /// initializer-clause:
2942 /// assignment-expression
2943 /// braced-init-list
2944 ///
2945 /// defaulted/deleted function-definition:
2946 /// '=' 'default'
2947 /// '=' 'delete'
2948 ///
2949 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2950 /// be a constant-expression.
2951 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2952  SourceLocation &EqualLoc) {
2953  assert(Tok.isOneOf(tok::equal, tok::l_brace)
2954  && "Data member initializer not starting with '=' or '{'");
2955 
2958  if (TryConsumeToken(tok::equal, EqualLoc)) {
2959  if (Tok.is(tok::kw_delete)) {
2960  // In principle, an initializer of '= delete p;' is legal, but it will
2961  // never type-check. It's better to diagnose it as an ill-formed expression
2962  // than as an ill-formed deleted non-function member.
2963  // An initializer of '= delete p, foo' will never be parsed, because
2964  // a top-level comma always ends the initializer expression.
2965  const Token &Next = NextToken();
2966  if (IsFunction || Next.isOneOf(tok::semi, tok::comma, tok::eof)) {
2967  if (IsFunction)
2968  Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2969  << 1 /* delete */;
2970  else
2971  Diag(ConsumeToken(), diag::err_deleted_non_function);
2972  return ExprError();
2973  }
2974  } else if (Tok.is(tok::kw_default)) {
2975  if (IsFunction)
2976  Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2977  << 0 /* default */;
2978  else
2979  Diag(ConsumeToken(), diag::err_default_special_members);
2980  return ExprError();
2981  }
2982  }
2983  if (const auto *PD = dyn_cast_or_null<MSPropertyDecl>(D)) {
2984  Diag(Tok, diag::err_ms_property_initializer) << PD;
2985  return ExprError();
2986  }
2987  return ParseInitializer();
2988 }
2989 
2990 void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc,
2991  SourceLocation AttrFixitLoc,
2992  unsigned TagType, Decl *TagDecl) {
2993  // Skip the optional 'final' keyword.
2994  if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2995  assert(isCXX11FinalKeyword() && "not a class definition");
2996  ConsumeToken();
2997 
2998  // Diagnose any C++11 attributes after 'final' keyword.
2999  // We deliberately discard these attributes.
3000  ParsedAttributesWithRange Attrs(AttrFactory);
3001  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
3002 
3003  // This can only happen if we had malformed misplaced attributes;
3004  // we only get called if there is a colon or left-brace after the
3005  // attributes.
3006  if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace))
3007  return;
3008  }
3009 
3010  // Skip the base clauses. This requires actually parsing them, because
3011  // otherwise we can't be sure where they end (a left brace may appear
3012  // within a template argument).
3013  if (Tok.is(tok::colon)) {
3014  // Enter the scope of the class so that we can correctly parse its bases.
3015  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
3016  ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true,
3017  TagType == DeclSpec::TST_interface);
3018  auto OldContext =
3019  Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl);
3020 
3021  // Parse the bases but don't attach them to the class.
3022  ParseBaseClause(nullptr);
3023 
3024  Actions.ActOnTagFinishSkippedDefinition(OldContext);
3025 
3026  if (!Tok.is(tok::l_brace)) {
3027  Diag(PP.getLocForEndOfToken(PrevTokLocation),
3028  diag::err_expected_lbrace_after_base_specifiers);
3029  return;
3030  }
3031  }
3032 
3033  // Skip the body.
3034  assert(Tok.is(tok::l_brace));
3035  BalancedDelimiterTracker T(*this, tok::l_brace);
3036  T.consumeOpen();
3037  T.skipToEnd();
3038 
3039  // Parse and discard any trailing attributes.
3040  ParsedAttributes Attrs(AttrFactory);
3041  if (Tok.is(tok::kw___attribute))
3042  MaybeParseGNUAttributes(Attrs);
3043 }
3044 
3045 Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas(
3046  AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs,
3047  DeclSpec::TST TagType, Decl *TagDecl) {
3048  ParenBraceBracketBalancer BalancerRAIIObj(*this);
3049 
3050  switch (Tok.getKind()) {
3051  case tok::kw___if_exists:
3052  case tok::kw___if_not_exists:
3053  ParseMicrosoftIfExistsClassDeclaration(TagType, AccessAttrs, AS);
3054  return nullptr;
3055 
3056  case tok::semi:
3057  // Check for extraneous top-level semicolon.
3058  ConsumeExtraSemi(InsideStruct, TagType);
3059  return nullptr;
3060 
3061  // Handle pragmas that can appear as member declarations.
3062  case tok::annot_pragma_vis:
3063  HandlePragmaVisibility();
3064  return nullptr;
3065  case tok::annot_pragma_pack:
3066  HandlePragmaPack();
3067  return nullptr;
3068  case tok::annot_pragma_align:
3069  HandlePragmaAlign();
3070  return nullptr;
3071  case tok::annot_pragma_ms_pointers_to_members:
3072  HandlePragmaMSPointersToMembers();
3073  return nullptr;
3074  case tok::annot_pragma_ms_pragma:
3075  HandlePragmaMSPragma();
3076  return nullptr;
3077  case tok::annot_pragma_ms_vtordisp:
3078  HandlePragmaMSVtorDisp();
3079  return nullptr;
3080  case tok::annot_pragma_dump:
3081  HandlePragmaDump();
3082  return nullptr;
3083 
3084  case tok::kw_namespace:
3085  // If we see a namespace here, a close brace was missing somewhere.
3086  DiagnoseUnexpectedNamespace(cast<NamedDecl>(TagDecl));
3087  return nullptr;
3088 
3089  case tok::kw_private:
3090  // FIXME: We don't accept GNU attributes on access specifiers in OpenCL mode
3091  // yet.
3092  if (getLangOpts().OpenCL && !NextToken().is(tok::colon))
3093  return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
3094  LLVM_FALLTHROUGH;
3095  case tok::kw_public:
3096  case tok::kw_protected: {
3097  AccessSpecifier NewAS = getAccessSpecifierIfPresent();
3098  assert(NewAS != AS_none);
3099  // Current token is a C++ access specifier.
3100  AS = NewAS;
3101  SourceLocation ASLoc = Tok.getLocation();
3102  unsigned TokLength = Tok.getLength();
3103  ConsumeToken();
3104  AccessAttrs.clear();
3105  MaybeParseGNUAttributes(AccessAttrs);
3106 
3107  SourceLocation EndLoc;
3108  if (TryConsumeToken(tok::colon, EndLoc)) {
3109  } else if (TryConsumeToken(tok::semi, EndLoc)) {
3110  Diag(EndLoc, diag::err_expected)
3111  << tok::colon << FixItHint::CreateReplacement(EndLoc, ":");
3112  } else {
3113  EndLoc = ASLoc.getLocWithOffset(TokLength);
3114  Diag(EndLoc, diag::err_expected)
3115  << tok::colon << FixItHint::CreateInsertion(EndLoc, ":");
3116  }
3117 
3118  // The Microsoft extension __interface does not permit non-public
3119  // access specifiers.
3120  if (TagType == DeclSpec::TST_interface && AS != AS_public) {
3121  Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected);
3122  }
3123 
3124  if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc, AccessAttrs)) {
3125  // found another attribute than only annotations
3126  AccessAttrs.clear();
3127  }
3128 
3129  return nullptr;
3130  }
3131 
3132  case tok::annot_pragma_openmp:
3133  return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, AccessAttrs, TagType,
3134  TagDecl);
3135 
3136  default:
3137  return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
3138  }
3139 }
3140 
3141 /// ParseCXXMemberSpecification - Parse the class definition.
3142 ///
3143 /// member-specification:
3144 /// member-declaration member-specification[opt]
3145 /// access-specifier ':' member-specification[opt]
3146 ///
3147 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
3148  SourceLocation AttrFixitLoc,
3149  ParsedAttributesWithRange &Attrs,
3150  unsigned TagType, Decl *TagDecl) {
3151  assert((TagType == DeclSpec::TST_struct ||
3152  TagType == DeclSpec::TST_interface ||
3153  TagType == DeclSpec::TST_union ||
3154  TagType == DeclSpec::TST_class) && "Invalid TagType!");
3155 
3156  llvm::TimeTraceScope TimeScope("ParseClass", [&]() {
3157  if (auto *TD = dyn_cast_or_null<NamedDecl>(TagDecl))
3158  return TD->getQualifiedNameAsString();
3159  return std::string("<anonymous>");
3160  });
3161 
3162  PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
3163  "parsing struct/union/class body");
3164 
3165  // Determine whether this is a non-nested class. Note that local
3166  // classes are *not* considered to be nested classes.
3167  bool NonNestedClass = true;
3168  if (!ClassStack.empty()) {
3169  for (const Scope *S = getCurScope(); S; S = S->getParent()) {
3170  if (S->isClassScope()) {
3171  // We're inside a class scope, so this is a nested class.
3172  NonNestedClass = false;
3173 
3174  // The Microsoft extension __interface does not permit nested classes.
3175  if (getCurrentClass().IsInterface) {
3176  Diag(RecordLoc, diag::err_invalid_member_in_interface)
3177  << /*ErrorType=*/6
3178  << (isa<NamedDecl>(TagDecl)
3179  ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
3180  : "(anonymous)");
3181  }
3182  break;
3183  }
3184 
3185  if ((S->getFlags() & Scope::FnScope))
3186  // If we're in a function or function template then this is a local
3187  // class rather than a nested class.
3188  break;
3189  }
3190  }
3191 
3192  // Enter a scope for the class.
3193  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
3194 
3195  // Note that we are parsing a new (potentially-nested) class definition.
3196  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
3197  TagType == DeclSpec::TST_interface);
3198 
3199  if (TagDecl)
3200  Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
3201 
3202  SourceLocation FinalLoc;
3203  bool IsFinalSpelledSealed = false;
3204 
3205  // Parse the optional 'final' keyword.
3206  if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
3207  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok);
3208  assert((Specifier == VirtSpecifiers::VS_Final ||
3209  Specifier == VirtSpecifiers::VS_GNU_Final ||
3210  Specifier == VirtSpecifiers::VS_Sealed) &&
3211  "not a class definition");
3212  FinalLoc = ConsumeToken();
3213  IsFinalSpelledSealed = Specifier == VirtSpecifiers::VS_Sealed;
3214 
3215  if (TagType == DeclSpec::TST_interface)
3216  Diag(FinalLoc, diag::err_override_control_interface)
3217  << VirtSpecifiers::getSpecifierName(Specifier);
3218  else if (Specifier == VirtSpecifiers::VS_Final)
3219  Diag(FinalLoc, getLangOpts().CPlusPlus11
3220  ? diag::warn_cxx98_compat_override_control_keyword
3221  : diag::ext_override_control_keyword)
3222  << VirtSpecifiers::getSpecifierName(Specifier);
3223  else if (Specifier == VirtSpecifiers::VS_Sealed)
3224  Diag(FinalLoc, diag::ext_ms_sealed_keyword);
3225  else if (Specifier == VirtSpecifiers::VS_GNU_Final)
3226  Diag(FinalLoc, diag::ext_warn_gnu_final);
3227 
3228  // Parse any C++11 attributes after 'final' keyword.
3229  // These attributes are not allowed to appear here,
3230  // and the only possible place for them to appertain
3231  // to the class would be between class-key and class-name.
3232  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
3233 
3234  // ParseClassSpecifier() does only a superficial check for attributes before
3235  // deciding to call this method. For example, for
3236  // `class C final alignas ([l) {` it will decide that this looks like a
3237  // misplaced attribute since it sees `alignas '(' ')'`. But the actual
3238  // attribute parsing code will try to parse the '[' as a constexpr lambda
3239  // and consume enough tokens that the alignas parsing code will eat the
3240  // opening '{'. So bail out if the next token isn't one we expect.
3241  if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) {
3242  if (TagDecl)
3243  Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3244  return;
3245  }
3246  }
3247 
3248  if (Tok.is(tok::colon)) {
3249  ParseScope InheritanceScope(this, getCurScope()->getFlags() |
3251 
3252  ParseBaseClause(TagDecl);
3253  if (!Tok.is(tok::l_brace)) {
3254  bool SuggestFixIt = false;
3255  SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation);
3256  if (Tok.isAtStartOfLine()) {
3257  switch (Tok.getKind()) {
3258  case tok::kw_private:
3259  case tok::kw_protected:
3260  case tok::kw_public:
3261  SuggestFixIt = NextToken().getKind() == tok::colon;
3262  break;
3263  case tok::kw_static_assert:
3264  case tok::r_brace:
3265  case tok::kw_using:
3266  // base-clause can have simple-template-id; 'template' can't be there
3267  case tok::kw_template:
3268  SuggestFixIt = true;
3269  break;
3270  case tok::identifier:
3271  SuggestFixIt = isConstructorDeclarator(true);
3272  break;
3273  default:
3274  SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false);
3275  break;
3276  }
3277  }
3278  DiagnosticBuilder LBraceDiag =
3279  Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers);
3280  if (SuggestFixIt) {
3281  LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {");
3282  // Try recovering from missing { after base-clause.
3283  PP.EnterToken(Tok, /*IsReinject*/true);
3284  Tok.setKind(tok::l_brace);
3285  } else {
3286  if (TagDecl)
3287  Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3288  return;
3289  }
3290  }
3291  }
3292 
3293  assert(Tok.is(tok::l_brace));
3294  BalancedDelimiterTracker T(*this, tok::l_brace);
3295  T.consumeOpen();
3296 
3297  if (TagDecl)
3298  Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
3299  IsFinalSpelledSealed,
3300  T.getOpenLocation());
3301 
3302  // C++ 11p3: Members of a class defined with the keyword class are private
3303  // by default. Members of a class defined with the keywords struct or union
3304  // are public by default.
3305  AccessSpecifier CurAS;
3306  if (TagType == DeclSpec::TST_class)
3307  CurAS = AS_private;
3308  else
3309  CurAS = AS_public;
3310  ParsedAttributesWithRange AccessAttrs(AttrFactory);
3311 
3312  if (TagDecl) {
3313  // While we still have something to read, read the member-declarations.
3314  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
3315  Tok.isNot(tok::eof)) {
3316  // Each iteration of this loop reads one member-declaration.
3317  ParseCXXClassMemberDeclarationWithPragmas(
3318  CurAS, AccessAttrs, static_cast<DeclSpec::TST>(TagType), TagDecl);
3319  }
3320  T.consumeClose();
3321  } else {
3322  SkipUntil(tok::r_brace);
3323  }
3324 
3325  // If attributes exist after class contents, parse them.
3326  ParsedAttributes attrs(AttrFactory);
3327  MaybeParseGNUAttributes(attrs);
3328 
3329  if (TagDecl)
3330  Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
3331  T.getOpenLocation(),
3332  T.getCloseLocation(), attrs);
3333 
3334  // C++11 [class.mem]p2:
3335  // Within the class member-specification, the class is regarded as complete
3336  // within function bodies, default arguments, exception-specifications, and
3337  // brace-or-equal-initializers for non-static data members (including such
3338  // things in nested classes).
3339  if (TagDecl && NonNestedClass) {
3340  // We are not inside a nested class. This class and its nested classes
3341  // are complete and we can parse the delayed portions of method
3342  // declarations and the lexed inline method definitions, along with any
3343  // delayed attributes.
3344  SourceLocation SavedPrevTokLocation = PrevTokLocation;
3345  ParseLexedAttributes(getCurrentClass());
3346  ParseLexedMethodDeclarations(getCurrentClass());
3347 
3348  // We've finished with all pending member declarations.
3349  Actions.ActOnFinishCXXMemberDecls();
3350 
3351  ParseLexedMemberInitializers(getCurrentClass());
3352  ParseLexedMethodDefs(getCurrentClass());
3353  PrevTokLocation = SavedPrevTokLocation;
3354 
3355  // We've finished parsing everything, including default argument
3356  // initializers.
3357  Actions.ActOnFinishCXXNonNestedClass(TagDecl);
3358  }
3359 
3360  if (TagDecl)
3361  Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());
3362 
3363  // Leave the class scope.
3364  ParsingDef.Pop();
3365  ClassScope.Exit();
3366 }
3367 
3368 void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) {
3369  assert(Tok.is(tok::kw_namespace));
3370 
3371  // FIXME: Suggest where the close brace should have gone by looking
3372  // at indentation changes within the definition body.
3373  Diag(D->getLocation(),
3374  diag::err_missing_end_of_definition) << D;
3375  Diag(Tok.getLocation(),
3376  diag::note_missing_end_of_definition_before) << D;
3377 
3378  // Push '};' onto the token stream to recover.
3379  PP.EnterToken(Tok, /*IsReinject*/ true);
3380 
3381  Tok.startToken();
3382  Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation));
3383  Tok.setKind(tok::semi);
3384  PP.EnterToken(Tok, /*IsReinject*/ true);
3385 
3386  Tok.setKind(tok::r_brace);
3387 }
3388 
3389 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
3390 /// which explicitly initializes the members or base classes of a
3391 /// class (C++ [class.base.init]). For example, the three initializers
3392 /// after the ':' in the Derived constructor below:
3393 ///
3394 /// @code
3395 /// class Base { };
3396 /// class Derived : Base {
3397 /// int x;
3398 /// float f;
3399 /// public:
3400 /// Derived(float f) : Base(), x(17), f(f) { }
3401 /// };
3402 /// @endcode
3403 ///
3404 /// [C++] ctor-initializer:
3405 /// ':' mem-initializer-list
3406 ///
3407 /// [C++] mem-initializer-list:
3408 /// mem-initializer ...[opt]
3409 /// mem-initializer ...[opt] , mem-initializer-list
3410 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
3411  assert(Tok.is(tok::colon) &&
3412  "Constructor initializer always starts with ':'");
3413 
3414  // Poison the SEH identifiers so they are flagged as illegal in constructor
3415  // initializers.
3416  PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
3418 
3419  SmallVector<CXXCtorInitializer*, 4> MemInitializers;
3420  bool AnyErrors = false;
3421 
3422  do {
3423  if (Tok.is(tok::code_completion)) {
3424  Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
3425  MemInitializers);
3426  return cutOffParsing();
3427  }
3428 
3429  MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
3430  if (!MemInit.isInvalid())
3431  MemInitializers.push_back(MemInit.get());
3432  else
3433  AnyErrors = true;
3434 
3435  if (Tok.is(tok::comma))
3436  ConsumeToken();
3437  else if (Tok.is(tok::l_brace))
3438  break;
3439  // If the previous initializer was valid and the next token looks like a
3440  // base or member initializer, assume that we're just missing a comma.
3441  else if (!MemInit.isInvalid() &&
3442  Tok.isOneOf(tok::identifier, tok::coloncolon)) {
3443  SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
3444  Diag(Loc, diag::err_ctor_init_missing_comma)
3445  << FixItHint::CreateInsertion(Loc, ", ");
3446  } else {
3447  // Skip over garbage, until we get to '{'. Don't eat the '{'.
3448  if (!MemInit.isInvalid())
3449  Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace
3450  << tok::comma;
3451  SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
3452  break;
3453  }
3454  } while (true);
3455 
3456  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
3457  AnyErrors);
3458 }
3459 
3460 /// ParseMemInitializer - Parse a C++ member initializer, which is
3461 /// part of a constructor initializer that explicitly initializes one
3462 /// member or base class (C++ [class.base.init]). See
3463 /// ParseConstructorInitializer for an example.
3464 ///
3465 /// [C++] mem-initializer:
3466 /// mem-initializer-id '(' expression-list[opt] ')'
3467 /// [C++0x] mem-initializer-id braced-init-list
3468 ///
3469 /// [C++] mem-initializer-id:
3470 /// '::'[opt] nested-name-specifier[opt] class-name
3471 /// identifier
3472 MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
3473  // parse '::'[opt] nested-name-specifier[opt]
3474  CXXScopeSpec SS;
3475  if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false))
3476  return true;
3477 
3478  // : identifier
3479  IdentifierInfo *II = nullptr;
3480  SourceLocation IdLoc = Tok.getLocation();
3481  // : declype(...)
3482  DeclSpec DS(AttrFactory);
3483  // : template_name<...>
3484  ParsedType TemplateTypeTy;
3485 
3486  if (Tok.is(tok::identifier)) {
3487  // Get the identifier. This may be a member name or a class name,
3488  // but we'll let the semantic analysis determine which it is.
3489  II = Tok.getIdentifierInfo();
3490  ConsumeToken();
3491  } else if (Tok.is(tok::annot_decltype)) {
3492  // Get the decltype expression, if there is one.
3493  // Uses of decltype will already have been converted to annot_decltype by
3494  // ParseOptionalCXXScopeSpecifier at this point.
3495  // FIXME: Can we get here with a scope specifier?
3496  ParseDecltypeSpecifier(DS);
3497  } else {
3498  TemplateIdAnnotation *TemplateId = Tok.is(tok::annot_template_id)
3499  ? takeTemplateIdAnnotation(Tok)
3500  : nullptr;
3501  if (TemplateId && (TemplateId->Kind == TNK_Type_template ||
3502  TemplateId->Kind == TNK_Dependent_template_name ||
3503  TemplateId->Kind == TNK_Undeclared_template)) {
3504  AnnotateTemplateIdTokenAsType(/*IsClassName*/true);
3505  assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
3506  TemplateTypeTy = getTypeAnnotation(Tok);
3507  ConsumeAnnotationToken();
3508  if (!TemplateTypeTy)
3509  return true;
3510  } else {
3511  Diag(Tok, diag::err_expected_member_or_base_name);
3512  return true;
3513  }
3514  }
3515 
3516  // Parse the '('.
3517  if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
3518  Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
3519 
3520  // FIXME: Add support for signature help inside initializer lists.
3521  ExprResult InitList = ParseBraceInitializer();
3522  if (InitList.isInvalid())
3523  return true;
3524 
3525  SourceLocation EllipsisLoc;
3526  TryConsumeToken(tok::ellipsis, EllipsisLoc);
3527 
3528  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3529  TemplateTypeTy, DS, IdLoc,
3530  InitList.get(), EllipsisLoc);
3531  } else if(Tok.is(tok::l_paren)) {
3532  BalancedDelimiterTracker T(*this, tok::l_paren);
3533  T.consumeOpen();
3534 
3535  // Parse the optional expression-list.
3536  ExprVector ArgExprs;
3537  CommaLocsTy CommaLocs;
3538  auto RunSignatureHelp = [&] {
3539  QualType PreferredType = Actions.ProduceCtorInitMemberSignatureHelp(
3540  getCurScope(), ConstructorDecl, SS, TemplateTypeTy, ArgExprs, II,
3541  T.getOpenLocation());
3542  CalledSignatureHelp = true;
3543  return PreferredType;
3544  };
3545  if (Tok.isNot(tok::r_paren) &&
3546  ParseExpressionList(ArgExprs, CommaLocs, [&] {
3547  PreferredType.enterFunctionArgument(Tok.getLocation(),
3548  RunSignatureHelp);
3549  })) {
3550  if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
3551  RunSignatureHelp();
3552  SkipUntil(tok::r_paren, StopAtSemi);
3553  return true;
3554  }
3555 
3556  T.consumeClose();
3557 
3558  SourceLocation EllipsisLoc;
3559  TryConsumeToken(tok::ellipsis, EllipsisLoc);
3560 
3561  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3562  TemplateTypeTy, DS, IdLoc,
3563  T.getOpenLocation(), ArgExprs,
3564  T.getCloseLocation(), EllipsisLoc);
3565  }
3566 
3567  if (getLangOpts().CPlusPlus11)
3568  return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace;
3569  else
3570  return Diag(Tok, diag::err_expected) << tok::l_paren;
3571 }
3572 
3573 /// Parse a C++ exception-specification if present (C++0x [except.spec]).
3574 ///
3575 /// exception-specification:
3576 /// dynamic-exception-specification
3577 /// noexcept-specification
3578 ///
3579 /// noexcept-specification:
3580 /// 'noexcept'
3581 /// 'noexcept' '(' constant-expression ')'
3583 Parser::tryParseExceptionSpecification(bool Delayed,
3584  SourceRange &SpecificationRange,
3585  SmallVectorImpl<ParsedType> &DynamicExceptions,
3586  SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
3587  ExprResult &NoexceptExpr,
3588  CachedTokens *&ExceptionSpecTokens) {
3590  ExceptionSpecTokens = nullptr;
3591 
3592  // Handle delayed parsing of exception-specifications.
3593  if (Delayed) {
3594  if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
3595  return EST_None;
3596 
3597  // Consume and cache the starting token.
3598  bool IsNoexcept = Tok.is(tok::kw_noexcept);
3599  Token StartTok = Tok;
3600  SpecificationRange = SourceRange(ConsumeToken());
3601 
3602  // Check for a '('.
3603  if (!Tok.is(tok::l_paren)) {
3604  // If this is a bare 'noexcept', we're done.
3605  if (IsNoexcept) {
3606  Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3607  NoexceptExpr = nullptr;
3608  return EST_BasicNoexcept;
3609  }
3610 
3611  Diag(Tok, diag::err_expected_lparen_after) << "throw";
3612  return EST_DynamicNone;
3613  }
3614 
3615  // Cache the tokens for the exception-specification.
3616  ExceptionSpecTokens = new CachedTokens;
3617  ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
3618  ExceptionSpecTokens->push_back(Tok); // '('
3619  SpecificationRange.setEnd(ConsumeParen()); // '('
3620 
3621  ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
3622  /*StopAtSemi=*/true,
3623  /*ConsumeFinalToken=*/true);
3624  SpecificationRange.setEnd(ExceptionSpecTokens->back().getLocation());
3625 
3626  return EST_Unparsed;
3627  }
3628 
3629  // See if there's a dynamic specification.
3630  if (Tok.is(tok::kw_throw)) {
3631  Result = ParseDynamicExceptionSpecification(SpecificationRange,
3632  DynamicExceptions,
3633  DynamicExceptionRanges);
3634  assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
3635  "Produced different number of exception types and ranges.");
3636  }
3637 
3638  // If there's no noexcept specification, we're done.
3639  if (Tok.isNot(tok::kw_noexcept))
3640  return Result;
3641 
3642  Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3643 
3644  // If we already had a dynamic specification, parse the noexcept for,
3645  // recovery, but emit a diagnostic and don't store the results.
3646  SourceRange NoexceptRange;
3647  ExceptionSpecificationType NoexceptType = EST_None;
3648 
3649  SourceLocation KeywordLoc = ConsumeToken();
3650  if (Tok.is(tok::l_paren)) {
3651  // There is an argument.
3652  BalancedDelimiterTracker T(*this, tok::l_paren);
3653  T.consumeOpen();
3654  NoexceptExpr = ParseConstantExpression();
3655  T.consumeClose();
3656  if (!NoexceptExpr.isInvalid()) {
3657  NoexceptExpr = Actions.ActOnNoexceptSpec(KeywordLoc, NoexceptExpr.get(),
3658  NoexceptType);
3659  NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
3660  } else {
3661  NoexceptType = EST_BasicNoexcept;
3662  }
3663  } else {
3664  // There is no argument.
3665  NoexceptType = EST_BasicNoexcept;
3666  NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
3667  }
3668 
3669  if (Result == EST_None) {
3670  SpecificationRange = NoexceptRange;
3671  Result = NoexceptType;
3672 
3673  // If there's a dynamic specification after a noexcept specification,
3674  // parse that and ignore the results.
3675  if (Tok.is(tok::kw_throw)) {
3676  Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3677  ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
3678  DynamicExceptionRanges);
3679  }
3680  } else {
3681  Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3682  }
3683 
3684  return Result;
3685 }
3686 
3688  Parser &P, SourceRange Range, bool IsNoexcept) {
3689  if (P.getLangOpts().CPlusPlus11) {
3690  const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
3691  P.Diag(Range.getBegin(),
3692  P.getLangOpts().CPlusPlus17 && !IsNoexcept
3693  ? diag::ext_dynamic_exception_spec
3694  : diag::warn_exception_spec_deprecated)
3695  << Range;
3696  P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
3697  << Replacement << FixItHint::CreateReplacement(Range, Replacement);
3698  }
3699 }
3700 
3701 /// ParseDynamicExceptionSpecification - Parse a C++
3702 /// dynamic-exception-specification (C++ [except.spec]).
3703 ///
3704 /// dynamic-exception-specification:
3705 /// 'throw' '(' type-id-list [opt] ')'
3706 /// [MS] 'throw' '(' '...' ')'
3707 ///
3708 /// type-id-list:
3709 /// type-id ... [opt]
3710 /// type-id-list ',' type-id ... [opt]
3711 ///
3712 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
3713  SourceRange &SpecificationRange,
3714  SmallVectorImpl<ParsedType> &Exceptions,
3715  SmallVectorImpl<SourceRange> &Ranges) {
3716  assert(Tok.is(tok::kw_throw) && "expected throw");
3717 
3718  SpecificationRange.setBegin(ConsumeToken());
3719  BalancedDelimiterTracker T(*this, tok::l_paren);
3720  if (T.consumeOpen()) {
3721  Diag(Tok, diag::err_expected_lparen_after) << "throw";
3722  SpecificationRange.setEnd(SpecificationRange.getBegin());
3723  return EST_DynamicNone;
3724  }
3725 
3726  // Parse throw(...), a Microsoft extension that means "this function
3727  // can throw anything".
3728  if (Tok.is(tok::ellipsis)) {
3729  SourceLocation EllipsisLoc = ConsumeToken();
3730  if (!getLangOpts().MicrosoftExt)
3731  Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
3732  T.consumeClose();
3733  SpecificationRange.setEnd(T.getCloseLocation());
3734  diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
3735  return EST_MSAny;
3736  }
3737 
3738  // Parse the sequence of type-ids.
3739  SourceRange Range;
3740  while (Tok.isNot(tok::r_paren)) {
3741  TypeResult Res(ParseTypeName(&Range));
3742 
3743  if (Tok.is(tok::ellipsis)) {
3744  // C++0x [temp.variadic]p5:
3745  // - In a dynamic-exception-specification (15.4); the pattern is a
3746  // type-id.
3747  SourceLocation Ellipsis = ConsumeToken();
3748  Range.setEnd(Ellipsis);
3749  if (!Res.isInvalid())
3750  Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
3751  }
3752 
3753  if (!Res.isInvalid()) {
3754  Exceptions.push_back(Res.get());
3755  Ranges.push_back(Range);
3756  }
3757 
3758  if (!TryConsumeToken(tok::comma))
3759  break;
3760  }
3761 
3762  T.consumeClose();
3763  SpecificationRange.setEnd(T.getCloseLocation());
3764  diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
3765  Exceptions.empty());
3766  return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3767 }
3768 
3769 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
3770 /// function declaration.
3771 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range,
3772  bool MayBeFollowedByDirectInit) {
3773  assert(Tok.is(tok::arrow) && "expected arrow");
3774 
3775  ConsumeToken();
3776 
3777  return ParseTypeName(&Range, MayBeFollowedByDirectInit
3780 }
3781 
3782 /// We have just started parsing the definition of a new class,
3783 /// so push that class onto our stack of classes that is currently
3784 /// being parsed.
3786 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
3787  bool IsInterface) {
3788  assert((NonNestedClass || !ClassStack.empty()) &&
3789  "Nested class without outer class");
3790  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
3791  return Actions.PushParsingClass();
3792 }
3793 
3794 /// Deallocate the given parsed class and all of its nested
3795 /// classes.
3796 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
3797  for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
3798  delete Class->LateParsedDeclarations[I];
3799  delete Class;
3800 }
3801 
3802 /// Pop the top class of the stack of classes that are
3803 /// currently being parsed.
3804 ///
3805 /// This routine should be called when we have finished parsing the
3806 /// definition of a class, but have not yet popped the Scope
3807 /// associated with the class's definition.
3808 void Parser::PopParsingClass(Sema::ParsingClassState state) {
3809  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
3810 
3811  Actions.PopParsingClass(state);
3812 
3813  ParsingClass *Victim = ClassStack.top();
3814  ClassStack.pop();
3815  if (Victim->TopLevelClass) {
3816  // Deallocate all of the nested classes of this class,
3817  // recursively: we don't need to keep any of this information.
3818  DeallocateParsedClasses(Victim);
3819  return;
3820  }
3821  assert(!ClassStack.empty() && "Missing top-level class?");
3822 
3823  if (Victim->LateParsedDeclarations.empty()) {
3824  // The victim is a nested class, but we will not need to perform
3825  // any processing after the definition of this class since it has
3826  // no members whose handling was delayed. Therefore, we can just
3827  // remove this nested class.
3828  DeallocateParsedClasses(Victim);
3829  return;
3830  }
3831 
3832  // This nested class has some members that will need to be processed
3833  // after the top-level class is completely defined. Therefore, add
3834  // it to the list of nested classes within its parent.
3835  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
3836  ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
3837  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
3838 }
3839 
3840 /// Try to parse an 'identifier' which appears within an attribute-token.
3841 ///
3842 /// \return the parsed identifier on success, and 0 if the next token is not an
3843 /// attribute-token.
3844 ///
3845 /// C++11 [dcl.attr.grammar]p3:
3846 /// If a keyword or an alternative token that satisfies the syntactic
3847 /// requirements of an identifier is contained in an attribute-token,
3848 /// it is considered an identifier.
3849 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
3850  switch (Tok.getKind()) {
3851  default:
3852  // Identifiers and keywords have identifier info attached.
3853  if (!Tok.isAnnotation()) {
3854  if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
3855  Loc = ConsumeToken();
3856  return II;
3857  }
3858  }
3859  return nullptr;
3860 
3861  case tok::numeric_constant: {
3862  // If we got a numeric constant, check to see if it comes from a macro that
3863  // corresponds to the predefined __clang__ macro. If it does, warn the user
3864  // and recover by pretending they said _Clang instead.
3865  if (Tok.getLocation().isMacroID()) {
3866  SmallString<8> ExpansionBuf;
3867  SourceLocation ExpansionLoc =
3868  PP.getSourceManager().getExpansionLoc(Tok.getLocation());
3869  StringRef Spelling = PP.getSpelling(ExpansionLoc, ExpansionBuf);
3870  if (Spelling == "__clang__") {
3871  SourceRange TokRange(
3872  ExpansionLoc,
3873  PP.getSourceManager().getExpansionLoc(Tok.getEndLoc()));
3874  Diag(Tok, diag::warn_wrong_clang_attr_namespace)
3875  << FixItHint::CreateReplacement(TokRange, "_Clang");
3876  Loc = ConsumeToken();
3877  return &PP.getIdentifierTable().get("_Clang");
3878  }
3879  }
3880  return nullptr;
3881  }
3882 
3883  case tok::ampamp: // 'and'
3884  case tok::pipe: // 'bitor'
3885  case tok::pipepipe: // 'or'
3886  case tok::caret: // 'xor'
3887  case tok::tilde: // 'compl'
3888  case tok::amp: // 'bitand'
3889  case tok::ampequal: // 'and_eq'
3890  case tok::pipeequal: // 'or_eq'
3891  case tok::caretequal: // 'xor_eq'
3892  case tok::exclaim: // 'not'
3893  case tok::exclaimequal: // 'not_eq'
3894  // Alternative tokens do not have identifier info, but their spelling
3895  // starts with an alphabetical character.
3896  SmallString<8> SpellingBuf;
3897  SourceLocation SpellingLoc =
3898  PP.getSourceManager().getSpellingLoc(Tok.getLocation());
3899  StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf);
3900  if (isLetter(Spelling[0])) {
3901  Loc = ConsumeToken();
3902  return &PP.getIdentifierTable().get(Spelling);
3903  }
3904  return nullptr;
3905  }
3906 }
3907 
3909  IdentifierInfo *ScopeName) {
3910  switch (ParsedAttr::getKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) {
3911  case ParsedAttr::AT_CarriesDependency:
3912  case ParsedAttr::AT_Deprecated:
3913  case ParsedAttr::AT_FallThrough:
3914  case ParsedAttr::AT_CXX11NoReturn:
3915  return true;
3916  case ParsedAttr::AT_WarnUnusedResult:
3917  return !ScopeName && AttrName->getName().equals("nodiscard");
3918  case ParsedAttr::AT_Unused:
3919  return !ScopeName && AttrName->getName().equals("maybe_unused");
3920  default:
3921  return false;
3922  }
3923 }
3924 
3925 /// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause.
3926 ///
3927 /// [C++11] attribute-argument-clause:
3928 /// '(' balanced-token-seq ')'
3929 ///
3930 /// [C++11] balanced-token-seq:
3931 /// balanced-token
3932 /// balanced-token-seq balanced-token
3933 ///
3934 /// [C++11] balanced-token:
3935 /// '(' balanced-token-seq ')'
3936 /// '[' balanced-token-seq ']'
3937 /// '{' balanced-token-seq '}'
3938 /// any token but '(', ')', '[', ']', '{', or '}'
3939 bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName,
3940  SourceLocation AttrNameLoc,
3941  ParsedAttributes &Attrs,
3942  SourceLocation *EndLoc,
3943  IdentifierInfo *ScopeName,
3944  SourceLocation ScopeLoc) {
3945  assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list");
3946  SourceLocation LParenLoc = Tok.getLocation();
3947  const LangOptions &LO = getLangOpts();
3948  ParsedAttr::Syntax Syntax =
3949  LO.CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x;
3950 
3951  // If the attribute isn't known, we will not attempt to parse any
3952  // arguments.
3953  if (!hasAttribute(LO.CPlusPlus ? AttrSyntax::CXX : AttrSyntax::C, ScopeName,
3954  AttrName, getTargetInfo(), getLangOpts())) {
3955  // Eat the left paren, then skip to the ending right paren.
3956  ConsumeParen();
3957  SkipUntil(tok::r_paren);
3958  return false;
3959  }
3960 
3961  if (ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"))) {
3962  // GNU-scoped attributes have some special cases to handle GNU-specific
3963  // behaviors.
3964  ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
3965  ScopeLoc, Syntax, nullptr);
3966  return true;
3967  }
3968 
3969  unsigned NumArgs;
3970  // Some Clang-scoped attributes have some special parsing behavior.
3971  if (ScopeName && (ScopeName->isStr("clang") || ScopeName->isStr("_Clang")))
3972  NumArgs = ParseClangAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc,
3973  ScopeName, ScopeLoc, Syntax);
3974  else
3975  NumArgs =
3976  ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
3977  ScopeName, ScopeLoc, Syntax);
3978 
3979  if (!Attrs.empty() &&
3980  IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) {
3981  ParsedAttr &Attr = Attrs.back();
3982  // If the attribute is a standard or built-in attribute and we are
3983  // parsing an argument list, we need to determine whether this attribute
3984  // was allowed to have an argument list (such as [[deprecated]]), and how
3985  // many arguments were parsed (so we can diagnose on [[deprecated()]]).
3986  if (Attr.getMaxArgs() && !NumArgs) {
3987  // The attribute was allowed to have arguments, but none were provided
3988  // even though the attribute parsed successfully. This is an error.
3989  Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName;
3990  Attr.setInvalid(true);
3991  } else if (!Attr.getMaxArgs()) {
3992  // The attribute parsed successfully, but was not allowed to have any
3993  // arguments. It doesn't matter whether any were provided -- the
3994  // presence of the argument list (even if empty) is diagnosed.
3995  Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments)
3996  << AttrName
3997  << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc));
3998  Attr.setInvalid(true);
3999  }
4000  }
4001  return true;
4002 }
4003 
4004 /// ParseCXX11AttributeSpecifier - Parse a C++11 or C2x attribute-specifier.
4005 ///
4006 /// [C++11] attribute-specifier:
4007 /// '[' '[' attribute-list ']' ']'
4008 /// alignment-specifier
4009 ///
4010 /// [C++11] attribute-list:
4011 /// attribute[opt]
4012 /// attribute-list ',' attribute[opt]
4013 /// attribute '...'
4014 /// attribute-list ',' attribute '...'
4015 ///
4016 /// [C++11] attribute:
4017 /// attribute-token attribute-argument-clause[opt]
4018 ///
4019 /// [C++11] attribute-token:
4020 /// identifier
4021 /// attribute-scoped-token
4022 ///
4023 /// [C++11] attribute-scoped-token:
4024 /// attribute-namespace '::' identifier
4025 ///
4026 /// [C++11] attribute-namespace:
4027 /// identifier
4028 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
4029  SourceLocation *endLoc) {
4030  if (Tok.is(tok::kw_alignas)) {
4031  Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
4032  ParseAlignmentSpecifier(attrs, endLoc);
4033  return;
4034  }
4035 
4036  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) &&
4037  "Not a double square bracket attribute list");
4038 
4039  Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
4040 
4041  ConsumeBracket();
4042  ConsumeBracket();
4043 
4044  SourceLocation CommonScopeLoc;
4045  IdentifierInfo *CommonScopeName = nullptr;
4046  if (Tok.is(tok::kw_using)) {
4047  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
4048  ? diag::warn_cxx14_compat_using_attribute_ns
4049  : diag::ext_using_attribute_ns);
4050  ConsumeToken();
4051 
4052  CommonScopeName = TryParseCXX11AttributeIdentifier(CommonScopeLoc);
4053  if (!CommonScopeName) {
4054  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4055  SkipUntil(tok::r_square, tok::colon, StopBeforeMatch);
4056  }
4057  if (!TryConsumeToken(tok::colon) && CommonScopeName)
4058  Diag(Tok.getLocation(), diag::err_expected) << tok::colon;
4059  }
4060 
4061  llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
4062 
4063  while (Tok.isNot(tok::r_square)) {
4064  // attribute not present
4065  if (TryConsumeToken(tok::comma))
4066  continue;
4067 
4068  SourceLocation ScopeLoc, AttrLoc;
4069  IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr;
4070 
4071  AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
4072  if (!AttrName)
4073  // Break out to the "expected ']'" diagnostic.
4074  break;
4075 
4076  // scoped attribute
4077  if (TryConsumeToken(tok::coloncolon)) {
4078  ScopeName = AttrName;
4079  ScopeLoc = AttrLoc;
4080 
4081  AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
4082  if (!AttrName) {
4083  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4084  SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch);
4085  continue;
4086  }
4087  }
4088 
4089  if (CommonScopeName) {
4090  if (ScopeName) {
4091  Diag(ScopeLoc, diag::err_using_attribute_ns_conflict)
4092  << SourceRange(CommonScopeLoc);
4093  } else {
4094  ScopeName = CommonScopeName;
4095  ScopeLoc = CommonScopeLoc;
4096  }
4097  }
4098 
4099  bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName);
4100  bool AttrParsed = false;
4101 
4102  if (StandardAttr &&
4103  !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second)
4104  Diag(AttrLoc, diag::err_cxx11_attribute_repeated)
4105  << AttrName << SourceRange(SeenAttrs[AttrName]);
4106 
4107  // Parse attribute arguments
4108  if (Tok.is(tok::l_paren))
4109  AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, attrs, endLoc,
4110  ScopeName, ScopeLoc);
4111 
4112  if (!AttrParsed)
4113  attrs.addNew(
4114  AttrName,
4115  SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, AttrLoc),
4116  ScopeName, ScopeLoc, nullptr, 0,
4118 
4119  if (TryConsumeToken(tok::ellipsis))
4120  Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
4121  << AttrName;
4122  }
4123 
4124  if (ExpectAndConsume(tok::r_square))
4125  SkipUntil(tok::r_square);
4126  if (endLoc)
4127  *endLoc = Tok.getLocation();
4128  if (ExpectAndConsume(tok::r_square))
4129  SkipUntil(tok::r_square);
4130 }
4131 
4132 /// ParseCXX11Attributes - Parse a C++11 or C2x attribute-specifier-seq.
4133 ///
4134 /// attribute-specifier-seq:
4135 /// attribute-specifier-seq[opt] attribute-specifier
4136 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
4137  SourceLocation *endLoc) {
4138  assert(standardAttributesAllowed());
4139 
4140  SourceLocation StartLoc = Tok.getLocation(), Loc;
4141  if (!endLoc)
4142  endLoc = &Loc;
4143 
4144  do {
4145  ParseCXX11AttributeSpecifier(attrs, endLoc);
4146  } while (isCXX11AttributeSpecifier());
4147 
4148  attrs.Range = SourceRange(StartLoc, *endLoc);
4149 }
4150 
4151 void Parser::DiagnoseAndSkipCXX11Attributes() {
4152  // Start and end location of an attribute or an attribute list.
4153  SourceLocation StartLoc = Tok.getLocation();
4154  SourceLocation EndLoc = SkipCXX11Attributes();
4155 
4156  if (EndLoc.isValid()) {
4157  SourceRange Range(StartLoc, EndLoc);
4158  Diag(StartLoc, diag::err_attributes_not_allowed)
4159  << Range;
4160  }
4161 }
4162 
4163 SourceLocation Parser::SkipCXX11Attributes() {
4164  SourceLocation EndLoc;
4165 
4166  if (!isCXX11AttributeSpecifier())
4167  return EndLoc;
4168 
4169  do {
4170  if (Tok.is(tok::l_square)) {
4171  BalancedDelimiterTracker T(*this, tok::l_square);
4172  T.consumeOpen();
4173  T.skipToEnd();
4174  EndLoc = T.getCloseLocation();
4175  } else {
4176  assert(Tok.is(tok::kw_alignas) && "not an attribute specifier");
4177  ConsumeToken();
4178  BalancedDelimiterTracker T(*this, tok::l_paren);
4179  if (!T.consumeOpen())
4180  T.skipToEnd();
4181  EndLoc = T.getCloseLocation();
4182  }
4183  } while (isCXX11AttributeSpecifier());
4184 
4185  return EndLoc;
4186 }
4187 
4188 /// Parse uuid() attribute when it appears in a [] Microsoft attribute.
4189 void Parser::ParseMicrosoftUuidAttributeArgs(ParsedAttributes &Attrs) {
4190  assert(Tok.is(tok::identifier) && "Not a Microsoft attribute list");
4191  IdentifierInfo *UuidIdent = Tok.getIdentifierInfo();
4192  assert(UuidIdent->getName() == "uuid" && "Not a Microsoft attribute list");
4193 
4194  SourceLocation UuidLoc = Tok.getLocation();
4195  ConsumeToken();
4196 
4197  // Ignore the left paren location for now.
4198  BalancedDelimiterTracker T(*this, tok::l_paren);
4199  if (T.consumeOpen()) {
4200  Diag(Tok, diag::err_expected) << tok::l_paren;
4201  return;
4202  }
4203 
4204  ArgsVector ArgExprs;
4205  if (Tok.is(tok::string_literal)) {
4206  // Easy case: uuid("...") -- quoted string.
4207  ExprResult StringResult = ParseStringLiteralExpression();
4208  if (StringResult.isInvalid())
4209  return;
4210  ArgExprs.push_back(StringResult.get());
4211  } else {
4212  // something like uuid({000000A0-0000-0000-C000-000000000049}) -- no
4213  // quotes in the parens. Just append the spelling of all tokens encountered
4214  // until the closing paren.
4215 
4216  SmallString<42> StrBuffer; // 2 "", 36 bytes UUID, 2 optional {}, 1 nul
4217  StrBuffer += "\"";
4218 
4219  // Since none of C++'s keywords match [a-f]+, accepting just tok::l_brace,
4220  // tok::r_brace, tok::minus, tok::identifier (think C000) and
4221  // tok::numeric_constant (0000) should be enough. But the spelling of the
4222  // uuid argument is checked later anyways, so there's no harm in accepting
4223  // almost anything here.
4224  // cl is very strict about whitespace in this form and errors out if any
4225  // is present, so check the space flags on the tokens.
4226  SourceLocation StartLoc = Tok.getLocation();
4227  while (Tok.isNot(tok::r_paren)) {
4228  if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4229  Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4230  SkipUntil(tok::r_paren, StopAtSemi);
4231  return;
4232  }
4233  SmallString<16> SpellingBuffer;
4234  SpellingBuffer.resize(Tok.getLength() + 1);
4235  bool Invalid = false;
4236  StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
4237  if (Invalid) {
4238  SkipUntil(tok::r_paren, StopAtSemi);
4239  return;
4240  }
4241  StrBuffer += TokSpelling;
4242  ConsumeAnyToken();
4243  }
4244  StrBuffer += "\"";
4245 
4246  if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4247  Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4248  ConsumeParen();
4249  return;
4250  }
4251 
4252  // Pretend the user wrote the appropriate string literal here.
4253  // ActOnStringLiteral() copies the string data into the literal, so it's
4254  // ok that the Token points to StrBuffer.
4255  Token Toks[1];
4256  Toks[0].startToken();
4257  Toks[0].setKind(tok::string_literal);
4258  Toks[0].setLocation(StartLoc);
4259  Toks[0].setLiteralData(StrBuffer.data());
4260  Toks[0].setLength(StrBuffer.size());
4261  StringLiteral *UuidString =
4262  cast<StringLiteral>(Actions.ActOnStringLiteral(Toks, nullptr).get());
4263  ArgExprs.push_back(UuidString);
4264  }
4265 
4266  if (!T.consumeClose()) {
4267  Attrs.addNew(UuidIdent, SourceRange(UuidLoc, T.getCloseLocation()), nullptr,
4268  SourceLocation(), ArgExprs.data(), ArgExprs.size(),
4270  }
4271 }
4272 
4273 /// ParseMicrosoftAttributes - Parse Microsoft attributes [Attr]
4274 ///
4275 /// [MS] ms-attribute:
4276 /// '[' token-seq ']'
4277 ///
4278 /// [MS] ms-attribute-seq:
4279 /// ms-attribute[opt]
4280 /// ms-attribute ms-attribute-seq
4281 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
4282  SourceLocation *endLoc) {
4283  assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
4284 
4285  do {
4286  // FIXME: If this is actually a C++11 attribute, parse it as one.
4287  BalancedDelimiterTracker T(*this, tok::l_square);
4288  T.consumeOpen();
4289 
4290  // Skip most ms attributes except for a whitelist.
4291  while (true) {
4292  SkipUntil(tok::r_square, tok::identifier, StopAtSemi | StopBeforeMatch);
4293  if (Tok.isNot(tok::identifier)) // ']', but also eof
4294  break;
4295  if (Tok.getIdentifierInfo()->getName() == "uuid")
4296  ParseMicrosoftUuidAttributeArgs(attrs);
4297  else
4298  ConsumeToken();
4299  }
4300 
4301  T.consumeClose();
4302  if (endLoc)
4303  *endLoc = T.getCloseLocation();
4304  } while (Tok.is(tok::l_square));
4305 }
4306 
4307 void Parser::ParseMicrosoftIfExistsClassDeclaration(
4308  DeclSpec::TST TagType, ParsedAttributes &AccessAttrs,
4309  AccessSpecifier &CurAS) {
4310  IfExistsCondition Result;
4311  if (ParseMicrosoftIfExistsCondition(Result))
4312  return;
4313 
4314  BalancedDelimiterTracker Braces(*this, tok::l_brace);
4315  if (Braces.consumeOpen()) {
4316  Diag(Tok, diag::err_expected) << tok::l_brace;
4317  return;
4318  }
4319 
4320  switch (Result.Behavior) {
4321  case IEB_Parse:
4322  // Parse the declarations below.
4323  break;
4324 
4325  case IEB_Dependent:
4326  Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
4327  << Result.IsIfExists;
4328  // Fall through to skip.
4329  LLVM_FALLTHROUGH;
4330 
4331  case IEB_Skip:
4332  Braces.skipToEnd();
4333  return;
4334  }
4335 
4336  while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
4337  // __if_exists, __if_not_exists can nest.
4338  if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
4339  ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType,
4340  AccessAttrs, CurAS);
4341  continue;
4342  }
4343 
4344  // Check for extraneous top-level semicolon.
4345  if (Tok.is(tok::semi)) {
4346  ConsumeExtraSemi(InsideStruct, TagType);
4347  continue;
4348  }
4349 
4350  AccessSpecifier AS = getAccessSpecifierIfPresent();
4351  if (AS != AS_none) {
4352  // Current token is a C++ access specifier.
4353  CurAS = AS;
4354  SourceLocation ASLoc = Tok.getLocation();
4355  ConsumeToken();
4356  if (Tok.is(tok::colon))
4357  Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation(),
4359  else
4360  Diag(Tok, diag::err_expected) << tok::colon;
4361  ConsumeToken();
4362  continue;
4363  }
4364 
4365  // Parse all the comma separated declarators.
4366  ParseCXXClassMemberDeclaration(CurAS, AccessAttrs);
4367  }
4368 
4369  Braces.consumeClose();
4370 }
Defines the clang::ASTContext interface.
DeclaratorChunk::FunctionTypeInfo & getFunctionTypeInfo()
getFunctionTypeInfo - Retrieves the function type info object (looking through parentheses).
Definition: DeclSpec.h:2271
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
no exception specification
ExprResult ParseExpression(TypeCastState isTypeCast=NotTypeCast)
Simple precedence-based parser for binary/ternary operators.
Definition: ParseExpr.cpp:122
unsigned getRawEncoding() const
When a SourceLocation itself cannot be used, this returns an (opaque) 32-bit integer encoding for it...
A (possibly-)qualified type.
Definition: Type.h:639
void clear()
Reset the contents of this Declarator.
Definition: DeclSpec.h:1920
void ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace)
ActOnFinishNamespaceDef - This callback is called after a namespace is exited.
IdentifierInfo * Name
FIXME: Temporarily stores the name of a specialization.
SourceLocation TemplateNameLoc
TemplateNameLoc - The location of the template name within the source.
bool hasPlaceholderType() const
Returns whether this expression has a placeholder type.
Definition: Expr.h:474
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
static CharSourceRange getTokenRange(SourceRange R)
The name refers to a dependent template name:
Definition: TemplateKinds.h:46
Decl * ActOnUsingDirective(Scope *CurScope, SourceLocation UsingLoc, SourceLocation NamespcLoc, CXXScopeSpec &SS, SourceLocation IdentLoc, IdentifierInfo *NamespcName, const ParsedAttributesView &AttrList)
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
RAII object used to inform the actions that we&#39;re currently parsing a declaration.
void CodeCompleteUsing(Scope *S)
A RAII object used to temporarily suppress access-like checking.
Defines the C++ template declaration subclasses.
StringRef P
bool isTemplateParamScope() const
isTemplateParamScope - Return true if this scope is a C++ template parameter scope.
Definition: Scope.h:378
The base class of the type hierarchy.
Definition: Type.h:1414
bool TryAnnotateCXXScopeToken(bool EnteringContext=false)
TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only annotates C++ scope specifiers and ...
Definition: Parser.cpp:1978
SourceLocation getCloseLocation() const
This indicates that the scope corresponds to a function, which means that labels are set here...
Definition: Scope.h:47
Declaration of a variable template.
bool isFunctionDeclarator(unsigned &idx) const
isFunctionDeclarator - This method returns true if the declarator is a function declarator (looking t...
Definition: DeclSpec.h:2240
static FixItHint CreateInsertionFromRange(SourceLocation InsertionLoc, CharSourceRange FromRange, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code from FromRange at a specific location...
Definition: Diagnostic.h:104
static const char * getSpecifierName(DeclSpec::TST T, const PrintingPolicy &Policy)
Turn a type-specifier-type into a string like "_Bool" or "union".
Definition: DeclSpec.cpp:520
std::unique_ptr< CachedTokens > DefaultArgTokens
DefaultArgTokens - When the parameter&#39;s default argument cannot be parsed immediately (because it occ...
Definition: DeclSpec.h:1237
static const char * getSpecifierName(Specifier VS)
Definition: DeclSpec.cpp:1399
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:105
TemplateNameKind Kind
The kind of template that Template refers to.
const NestedNameSpecifier * Specifier
Wrapper for void* pointer.
Definition: Ownership.h:50
Parser - This implements a parser for the C family of languages.
Definition: Parser.h:57
constexpr XRayInstrMask Function
Definition: XRayInstr.h:38
void SetIdentifier(IdentifierInfo *Id, SourceLocation IdLoc)
Set the name of this declarator to be the given identifier.
Definition: DeclSpec.h:2139
const ParsedAttributes & getAttributes() const
Definition: DeclSpec.h:2412
RAII object that enters a new expression evaluation context.
Definition: Sema.h:11127
static const TST TST_underlyingType
Definition: DeclSpec.h:302
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1768
void setTypeofParensRange(SourceRange range)
Definition: DeclSpec.h:515
TypeSpecifierType
Specifies the kind of type.
Definition: Specifiers.h:52
static const TST TST_interface
Definition: DeclSpec.h:295
bool isInvalidDecl() const
Definition: DeclBase.h:546
Like System, but searched after the system directories.
void setBegin(SourceLocation b)
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:37
RAII object that makes sure paren/bracket/brace count is correct after declaration/statement parsing...
ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc, Scope *S, CXXScopeSpec *SS=nullptr, bool isClassName=false, bool HasTrailingDot=false, ParsedType ObjectType=nullptr, bool IsCtorOrDtorName=false, bool WantNontrivialTypeSourceInfo=false, bool IsClassTemplateDeductionContext=true, IdentifierInfo **CorrectedII=nullptr)
If the identifier refers to a type name within this scope, return the declaration of that type...
Definition: SemaDecl.cpp:280
bool isAnnotation() const
Return true if this is any of tok::annot_* kind tokens.
Definition: Token.h:120
friend class ObjCDeclContextSwitch
Definition: Parser.h:61
ColonProtectionRAIIObject - This sets the Parser::ColonIsSacred bool and restores it when destroyed...
bool isUnset() const
Definition: Ownership.h:168
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:1089
Information about a template-id annotation token.
bool isUnset() const
Definition: DeclSpec.h:2518
SourceLocation getFriendSpecLoc() const
Definition: DeclSpec.h:725
Represents a struct/union/class.
Definition: Decl.h:3598
const Token & NextToken()
NextToken - This peeks ahead one token and returns it without consuming it.
Definition: Parser.h:755
bool TryConsumeToken(tok::TokenKind Expected)
Definition: Parser.h:456
One of these records is kept for each identifier that is lexed.
Decl * ActOnStartNamespaceDef(Scope *S, SourceLocation InlineLoc, SourceLocation NamespaceLoc, SourceLocation IdentLoc, IdentifierInfo *Ident, SourceLocation LBrace, const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UsingDecl)
ActOnStartNamespaceDef - This is called at the start of a namespace definition.
Decl * ActOnNamespaceAliasDef(Scope *CurScope, SourceLocation NamespaceLoc, SourceLocation AliasLoc, IdentifierInfo *Alias, CXXScopeSpec &SS, SourceLocation IdentLoc, IdentifierInfo *Ident)
SourceLocation getAnnotationEndLoc() const
Definition: Token.h:140
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Copy initialization.
Definition: Specifiers.h:238
Lookup for the name failed, but we&#39;re assuming it was a template name anyway.
Definition: TemplateKinds.h:50
LLVM_READONLY bool isLetter(unsigned char c)
Return true if this character is an ASCII letter: [a-zA-Z].
Definition: CharInfo.h:111
static const TST TST_class
Definition: DeclSpec.h:296
The current expression is potentially evaluated at run time, which means that code may be generated t...
DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType=nullptr)
Definition: SemaDecl.cpp:53
static const TST TST_error
Definition: DeclSpec.h:310
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
void setKind(tok::TokenKind K)
Definition: Token.h:93
RAII class that helps handle the parsing of an open/close delimiter pair, such as braces { ...
bool DiagnoseUnknownTemplateName(const IdentifierInfo &II, SourceLocation IILoc, Scope *S, const CXXScopeSpec *SS, TemplateTy &SuggestedTemplate, TemplateNameKind &SuggestedKind)
bool hasTagDefinition() const
Definition: DeclSpec.cpp:427
void ClearStorageClassSpecs()
Definition: DeclSpec.h:455
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:49
i32 captured_struct **param SharedsTy A type which contains references the shared variables *param Shareds Context with the list of shared variables from the p *TaskFunction *param Data Additional data for task generation like final * state
bool isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const
Return true if we have an ObjC keyword identifier.
Definition: Lexer.cpp:57
void setExternInLinkageSpec(bool Value)
Definition: DeclSpec.h:446
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:937
static ParsedType getTypeAnnotation(const Token &Tok)
getTypeAnnotation - Read a parsed type out of an annotation token.
Definition: Parser.h:760
PtrTy get() const
Definition: Ownership.h:170
Microsoft throw(...) extension.
DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef< Decl *> Group)
BuildDeclaratorGroup - convert a list of declarations into a declaration group, performing any necess...
Definition: SemaDecl.cpp:12361
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...
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:654
void takeAllFrom(ParsedAttributes &attrs)
Definition: ParsedAttr.h:913
ParsedTemplateArgument * getTemplateArgs()
Retrieves a pointer to the template arguments.
MutableArrayRef< TemplateParameterList * > MultiTemplateParamsArg
Definition: Ownership.h:277
ActionResult< ParsedType > TypeResult
Definition: Ownership.h:265
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
int hasAttribute(AttrSyntax Syntax, const IdentifierInfo *Scope, const IdentifierInfo *Attr, const TargetInfo &Target, const LangOptions &LangOpts)
Return the version number associated with the attribute if we recognize and implement the attribute s...
Definition: Attributes.cpp:7
SourceLocation ConsumeAnyToken(bool ConsumeCodeCompletionTok=false)
ConsumeAnyToken - Dispatch to the right Consume* method based on the current token type...
Definition: Parser.h:476
Decl * ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, Expr *LangStr, SourceLocation LBraceLoc)
ActOnStartLinkageSpecification - Parsed the beginning of a C++ linkage specification, including the language and (if present) the &#39;{&#39;.
SourceRange getSourceRange() const LLVM_READONLY
Definition: DeclSpec.h:497
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
SourceLocation TemplateKWLoc
TemplateKWLoc - The location of the template keyword.
void setInvalid(bool b=true) const
Definition: ParsedAttr.h:428
SourceLocation LAngleLoc
The location of the &#39;<&#39; before the template argument list.
A little helper class used to produce diagnostics.
Definition: Diagnostic.h:1044
A class for parsing a declarator.
bool isDeclarationOfFunction() const
Determine whether the declaration that will be produced from this declaration will be a function...
Definition: DeclSpec.cpp:312
bool isPastIdentifier() const
isPastIdentifier - Return true if we have parsed beyond the point where the name would appear...
Definition: DeclSpec.h:2114
void SetRangeStart(SourceLocation Loc)
Definition: DeclSpec.h:628
unsigned NumParams
NumParams - This is the number of formal parameters specified by the declarator.
Definition: DeclSpec.h:1291
SourceRange getRange() const
Definition: DeclSpec.h:68
TST getTypeSpecType() const
Definition: DeclSpec.h:473
Decl * ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, Expr *AssertExpr, Expr *AssertMessageExpr, SourceLocation RParenLoc)
A single parameter index whose accessors require each use to make explicit the parameter index encodi...
Definition: Attr.h:213
This represents one expression.
Definition: Expr.h:108
static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName, IdentifierInfo *ScopeName)
Represents a character-granular source range.
int Id
Definition: ASTDiff.cpp:190
Kind getKind() const
Definition: ParsedAttr.h:453
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:1897
bool ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext, bool AllowDestructorName, bool AllowConstructorName, bool AllowDeductionGuide, ParsedType ObjectType, SourceLocation *TemplateKWLoc, UnqualifiedId &Result)
Parse a C++ unqualified-id (or a C identifier), which describes the name of an entity.
Specifier getLastSpecifier() const
Definition: DeclSpec.h:2533
TypeResult ActOnTypeName(Scope *S, Declarator &D)
Definition: SemaType.cpp:5810
void RevertCachedTokens(unsigned N)
When backtracking is enabled and tokens are cached, this allows to revert a specific number of tokens...
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:131
OpaquePtr< TemplateName > TemplateTy
Definition: Parser.h:420
Defines an enumeration for C++ overloaded operators.
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file. ...
Definition: Token.h:126
void setAsmLabel(Expr *E)
Definition: DeclSpec.h:2433
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:72
Decl * ActOnFinishExportDecl(Scope *S, Decl *ExportDecl, SourceLocation RBraceLoc)
Complete the definition of an export declaration.
Definition: SemaModule.cpp:689
Represents a C++ template name within the type system.
Definition: TemplateName.h:187
The current expression and its subexpressions occur within an unevaluated operand (C++11 [expr]p7)...
CachedTokens * ExceptionSpecTokens
Pointer to the cached tokens for an exception-specification that has not yet been parsed...
Definition: DeclSpec.h:1336
TemplateNameKind
Specifies the kind of template name that an identifier refers to.
Definition: TemplateKinds.h:20
InClassInitStyle
In-class initialization styles for non-static data members.
Definition: Specifiers.h:236
DeclaratorContext
Definition: DeclSpec.h:1726
bool isInvalid() const
Definition: Ownership.h:166
SourceLocation getOpenLocation() const
ParsedType getInheritingConstructorName(CXXScopeSpec &SS, SourceLocation NameLoc, IdentifierInfo &Name)
Handle the result of the special case name lookup for inheriting constructor declarations.
Definition: SemaExprCXX.cpp:48
bool isFriendSpecified() const
Definition: DeclSpec.h:724
The result type of a method or function.
void CodeCompleteNamespaceDecl(Scope *S)
PrettyDeclStackTraceEntry - If a crash occurs in the parser while parsing something related to a decl...
const LangOptions & getLangOpts() const
Definition: Parser.h:403
A class for parsing a DeclSpec.
Represents a C++ Modules TS module export declaration.
Definition: Decl.h:4226
ExprResult ActOnDecltypeExpression(Expr *E)
Process the expression contained within a decltype.
bool isArrayOfUnknownBound() const
isArrayOfUnknownBound - This method returns true if the declarator is a declarator for an array of un...
Definition: DeclSpec.h:2230
Kind
Stop skipping at semicolon.
Definition: Parser.h:1069
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
SCS getStorageClassSpec() const
Definition: DeclSpec.h:441
bool ParseTopLevelDecl()
Definition: Parser.h:438
ASTContext & getASTContext() const
Definition: Sema.h:1283
bool hasName() const
hasName - Whether this declarator has a name, which might be an identifier (accessible via getIdentif...
Definition: DeclSpec.h:2120
Encodes a location in the source.
Decl * ActOnFinishLinkageSpecification(Scope *S, Decl *LinkageSpec, SourceLocation RBraceLoc)
ActOnFinishLinkageSpecification - Complete the definition of the C++ linkage specification LinkageSpe...
void setLength(unsigned Len)
Definition: Token.h:135
Syntax
The style used to specify an attribute.
Definition: ParsedAttr.h:139
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3069
static const TST TST_union
Definition: DeclSpec.h:293
IdentifierInfo * getIdentifierInfo() const
Definition: Token.h:179
void setAnnotationEndLoc(SourceLocation L)
Definition: Token.h:144
ParsedAttr - Represents a syntactic attribute.
Definition: ParsedAttr.h:116
ExtensionRAIIObject - This saves the state of extension warnings when constructed and disables them...
ParsedAttr * addNew(IdentifierInfo *attrName, SourceRange attrRange, IdentifierInfo *scopeName, SourceLocation scopeLoc, ArgsUnion *args, unsigned numArgs, ParsedAttr::Syntax syntax, SourceLocation ellipsisLoc=SourceLocation())
Add attribute with expression arguments.
Definition: ParsedAttr.h:932
bool isAtStartOfLine() const
isAtStartOfLine - Return true if this token is at the start of a line.
Definition: Token.h:268
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:24
Direct list-initialization.
Definition: Specifiers.h:239
Represents a C++11 virt-specifier-seq.
Definition: DeclSpec.h:2502
void EnterToken(const Token &Tok, bool IsReinject)
Enters a token in the token stream to be lexed next.
Decl * ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc, SourceLocation LBraceLoc)
We have parsed the start of an export declaration, including the &#39;{&#39; (if present).
Definition: SemaModule.cpp:523
FunctionDefinitionKind
Described the kind of function definition (if any) provided for a function.
Definition: DeclSpec.h:1719
Scope * getCurScope() const
Definition: Parser.h:410
ExprResult ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast=NotTypeCast)
Definition: ParseExpr.cpp:200
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:194
void setFunctionDefinitionKind(FunctionDefinitionKind Val)
Definition: DeclSpec.h:2461
SourceLocation getModulePrivateSpecLoc() const
Definition: DeclSpec.h:728
StringRef getName() const
Return the actual identifier string.
The scope of a struct/union/class definition.
Definition: Scope.h:65
bool isNot(tok::TokenKind K) const
Definition: Token.h:98
bool isBacktrackEnabled() const
True if EnableBacktrackAtThisPos() was called and caching of tokens is on.
static const TST TST_decltype_auto
Definition: DeclSpec.h:301
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
SmallVector< Token, 4 > CachedTokens
A set of tokens that has been cached for later parsing.
Definition: DeclSpec.h:1145
static const TST TST_decltype
Definition: DeclSpec.h:300
const Scope * getParent() const
getParent - Return the scope that this is nested in.
Definition: Scope.h:228
static void diagnoseDynamicExceptionSpecification(Parser &P, SourceRange Range, bool IsNoexcept)
CXXScopeSpec SS
The nested-name-specifier that precedes the template name.
SourceLocation RAngleLoc
The location of the &#39;>&#39; after the template argument list.
void CodeCompleteTag(Scope *S, unsigned TagSpec)
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:117
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const
Definition: Token.h:99
The name refers to a template whose specialization produces a type.
Definition: TemplateKinds.h:30
unsigned getLength() const
Definition: Token.h:129
bool isMacroID() const
void CodeCompleteNamespaceAliasDecl(Scope *S)
void forEachQualifier(llvm::function_ref< void(TQ, StringRef, SourceLocation)> Handle)
This method calls the passed in handler on each qual being set.
Definition: DeclSpec.cpp:421
void setLiteralData(const char *Ptr)
Definition: Token.h:221
void CodeCompleteUsingDirective(Scope *S)
const TargetInfo & getTargetInfo() const
Definition: Parser.h:404
bool SetSpecifier(Specifier VS, SourceLocation Loc, const char *&PrevSpec)
Definition: DeclSpec.cpp:1374
unsigned getTypeQualifiers() const
getTypeQualifiers - Return a set of TQs.
Definition: DeclSpec.h:537
void takeAttributesFrom(ParsedAttributes &attrs)
Definition: DeclSpec.h:768
DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Definition: Parser.cpp:72
static const TST TST_typename
Definition: DeclSpec.h:297
void SetRangeEnd(SourceLocation Loc)
SetRangeEnd - Set the end of the source range to Loc, unless it&#39;s invalid.
Definition: DeclSpec.h:1904
ExceptionSpecificationType
The various types of exception specifications that exist in C++11.
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:91
We are between inheritance colon and the real class/struct definition scope.
Definition: Scope.h:133
ExceptionSpecificationType getExceptionSpecType() const
Get the type of exception specification this function has.
Definition: DeclSpec.h:1461
SmallVector< TemplateParameterList *, 4 > TemplateParameterLists
Definition: Parser.h:422
CXXScopeSpec & getTypeSpecScope()
Definition: DeclSpec.h:494
This is a scope that can contain a declaration.
Definition: Scope.h:59
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec, unsigned &DiagID, const PrintingPolicy &Policy)
Definition: DeclSpec.cpp:778
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2136
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
unsigned getMaxArgs() const
Definition: ParsedAttr.cpp:199
void getCXX11AttributeRanges(SmallVectorImpl< SourceRange > &Ranges)
Return a source range list of C++11 attributes associated with the declarator.
Definition: DeclSpec.h:2427
X
Add a minimal nested name specifier fixit hint to allow lookup of a tag name from an outer enclosing ...
Definition: SemaDecl.cpp:14095
ExprResult ParseConstantExpression(TypeCastState isTypeCast=NotTypeCast)
Definition: ParseExpr.cpp:210
Captures information about "declaration specifiers".
Definition: DeclSpec.h:228
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
void setEnd(SourceLocation e)
SourceLocation ConsumeToken()
ConsumeToken - Consume the current &#39;peek token&#39; and lex the next one.
Definition: Parser.h:448
bool isValid() const
bool isNotEmpty() const
A scope specifier is present, but may be valid or invalid.
Definition: DeclSpec.h:191
const DeclSpec & getDeclSpec() const
getDeclSpec - Return the declaration-specifier that this declarator was declared with.
Definition: DeclSpec.h:1857
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:128
void revertTokenIDToIdentifier()
Revert TokenID to tok::identifier; used for GNU libstdc++ 4.2 compatibility.
A template-id, e.g., f<int>.
SourceLocation getFirstLocation() const
Definition: DeclSpec.h:2531
[uuid("...")] class Foo
Definition: ParsedAttr.h:153
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1599
Defines the clang::TargetInfo interface.
void ExtendWithDeclSpec(const DeclSpec &DS)
ExtendWithDeclSpec - Extend the declarator source range to include the given declspec, unless its location is invalid.
Definition: DeclSpec.h:1911
ExprResult ExprError()
Definition: Ownership.h:279
static OpaquePtr make(PtrTy P)
Definition: Ownership.h:60
static const TST TST_struct
Definition: DeclSpec.h:294
Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:65
void setLocation(SourceLocation L)
Definition: Token.h:134
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:374
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:1026
bool SetTypeSpecError()
Definition: DeclSpec.cpp:881
Expr * getRepAsExpr() const
Definition: DeclSpec.h:490
__ptr16, alignas(...), etc.
Definition: ParsedAttr.h:156
Represents C++ using-directive.
Definition: DeclCXX.h:3041
unsigned NumArgs
NumArgs - The number of template arguments.
void SetRangeEnd(SourceLocation Loc)
Definition: DeclSpec.h:629
Decl * ActOnAliasDeclaration(Scope *CurScope, AccessSpecifier AS, MultiTemplateParamsArg TemplateParams, SourceLocation UsingLoc, UnqualifiedId &Name, const ParsedAttributesView &AttrList, TypeResult Type, Decl *DeclFromDeclSpec)
SourceLocation getBegin() const
ParsedAttributes - A collection of parsed attributes.
Definition: ParsedAttr.h:906
SourceLocation ColonLoc
Location of &#39;:&#39;.
Definition: OpenMPClause.h:107
void setCommaLoc(SourceLocation CL)
Definition: DeclSpec.h:2455
bool hasLeadingSpace() const
Return true if this token has whitespace before it.
Definition: Token.h:272
No in-class initializer.
Definition: Specifiers.h:237
Decl * ActOnUsingDeclaration(Scope *CurScope, AccessSpecifier AS, SourceLocation UsingLoc, SourceLocation TypenameLoc, CXXScopeSpec &SS, UnqualifiedId &Name, SourceLocation EllipsisLoc, const ParsedAttributesView &AttrList)
ParamInfo * Params
Params - This is a pointer to a new[]&#39;d array of ParamInfo objects that describe the parameters speci...
Definition: DeclSpec.h:1316
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
Attr - This represents one attribute.
Definition: Attr.h:43
SourceLocation getLocation() const
Definition: DeclBase.h:422
void startToken()
Reset all flags to cleared.
Definition: Token.h:171
ParsedTemplateTy Template
The declaration of the template corresponding to the template-name.
Stop skipping at specified token, but don&#39;t skip the token itself.
Definition: Parser.h:1071
SourceLocation getEndLoc() const
Definition: Token.h:153