clang  10.0.0svn
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_feature) << Tok.getName();
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  /*WantNontrivialTypeSourceInfo=*/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  case tok::kw_consteval: // struct foo {...} consteval x;
1317  case tok::kw_constinit: // struct foo {...} constinit x;
1318  // As shown above, type qualifiers and storage class specifiers absolutely
1319  // can occur after class specifiers according to the grammar. However,
1320  // almost no one actually writes code like this. If we see one of these,
1321  // it is much more likely that someone missed a semi colon and the
1322  // type/storage class specifier we're seeing is part of the *next*
1323  // intended declaration, as in:
1324  //
1325  // struct foo { ... }
1326  // typedef int X;
1327  //
1328  // We'd really like to emit a missing semicolon error instead of emitting
1329  // an error on the 'int' saying that you can't have two type specifiers in
1330  // the same declaration of X. Because of this, we look ahead past this
1331  // token to see if it's a type specifier. If so, we know the code is
1332  // otherwise invalid, so we can produce the expected semi error.
1333  if (!isKnownToBeTypeSpecifier(NextToken()))
1334  return true;
1335  break;
1336  case tok::r_brace: // struct bar { struct foo {...} }
1337  // Missing ';' at end of struct is accepted as an extension in C mode.
1338  if (!getLangOpts().CPlusPlus)
1339  return true;
1340  break;
1341  case tok::greater:
1342  // template<class T = class X>
1343  return getLangOpts().CPlusPlus;
1344  }
1345  return false;
1346 }
1347 
1348 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1349 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1350 /// until we reach the start of a definition or see a token that
1351 /// cannot start a definition.
1352 ///
1353 /// class-specifier: [C++ class]
1354 /// class-head '{' member-specification[opt] '}'
1355 /// class-head '{' member-specification[opt] '}' attributes[opt]
1356 /// class-head:
1357 /// class-key identifier[opt] base-clause[opt]
1358 /// class-key nested-name-specifier identifier base-clause[opt]
1359 /// class-key nested-name-specifier[opt] simple-template-id
1360 /// base-clause[opt]
1361 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1362 /// [GNU] class-key attributes[opt] nested-name-specifier
1363 /// identifier base-clause[opt]
1364 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1365 /// simple-template-id base-clause[opt]
1366 /// class-key:
1367 /// 'class'
1368 /// 'struct'
1369 /// 'union'
1370 ///
1371 /// elaborated-type-specifier: [C++ dcl.type.elab]
1372 /// class-key ::[opt] nested-name-specifier[opt] identifier
1373 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1374 /// simple-template-id
1375 ///
1376 /// Note that the C++ class-specifier and elaborated-type-specifier,
1377 /// together, subsume the C99 struct-or-union-specifier:
1378 ///
1379 /// struct-or-union-specifier: [C99 6.7.2.1]
1380 /// struct-or-union identifier[opt] '{' struct-contents '}'
1381 /// struct-or-union identifier
1382 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1383 /// '}' attributes[opt]
1384 /// [GNU] struct-or-union attributes[opt] identifier
1385 /// struct-or-union:
1386 /// 'struct'
1387 /// 'union'
1388 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1389  SourceLocation StartLoc, DeclSpec &DS,
1390  const ParsedTemplateInfo &TemplateInfo,
1391  AccessSpecifier AS,
1392  bool EnteringContext, DeclSpecContext DSC,
1393  ParsedAttributesWithRange &Attributes) {
1395  if (TagTokKind == tok::kw_struct)
1396  TagType = DeclSpec::TST_struct;
1397  else if (TagTokKind == tok::kw___interface)
1398  TagType = DeclSpec::TST_interface;
1399  else if (TagTokKind == tok::kw_class)
1400  TagType = DeclSpec::TST_class;
1401  else {
1402  assert(TagTokKind == tok::kw_union && "Not a class specifier");
1403  TagType = DeclSpec::TST_union;
1404  }
1405 
1406  if (Tok.is(tok::code_completion)) {
1407  // Code completion for a struct, class, or union name.
1408  Actions.CodeCompleteTag(getCurScope(), TagType);
1409  return cutOffParsing();
1410  }
1411 
1412  // C++03 [temp.explicit] 14.7.2/8:
1413  // The usual access checking rules do not apply to names used to specify
1414  // explicit instantiations.
1415  //
1416  // As an extension we do not perform access checking on the names used to
1417  // specify explicit specializations either. This is important to allow
1418  // specializing traits classes for private types.
1419  //
1420  // Note that we don't suppress if this turns out to be an elaborated
1421  // type specifier.
1422  bool shouldDelayDiagsInTag =
1423  (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1424  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1425  SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1426 
1427  ParsedAttributesWithRange attrs(AttrFactory);
1428  // If attributes exist after tag, parse them.
1429  MaybeParseGNUAttributes(attrs);
1430  MaybeParseMicrosoftDeclSpecs(attrs);
1431 
1432  // Parse inheritance specifiers.
1433  if (Tok.isOneOf(tok::kw___single_inheritance,
1434  tok::kw___multiple_inheritance,
1435  tok::kw___virtual_inheritance))
1436  ParseMicrosoftInheritanceClassAttributes(attrs);
1437 
1438  // If C++0x attributes exist here, parse them.
1439  // FIXME: Are we consistent with the ordering of parsing of different
1440  // styles of attributes?
1441  MaybeParseCXX11Attributes(attrs);
1442 
1443  // Source location used by FIXIT to insert misplaced
1444  // C++11 attributes
1445  SourceLocation AttrFixitLoc = Tok.getLocation();
1446 
1447  if (TagType == DeclSpec::TST_struct &&
1448  Tok.isNot(tok::identifier) &&
1449  !Tok.isAnnotation() &&
1450  Tok.getIdentifierInfo() &&
1451  Tok.isOneOf(tok::kw___is_abstract,
1452  tok::kw___is_aggregate,
1453  tok::kw___is_arithmetic,
1454  tok::kw___is_array,
1455  tok::kw___is_assignable,
1456  tok::kw___is_base_of,
1457  tok::kw___is_class,
1458  tok::kw___is_complete_type,
1459  tok::kw___is_compound,
1460  tok::kw___is_const,
1461  tok::kw___is_constructible,
1462  tok::kw___is_convertible,
1463  tok::kw___is_convertible_to,
1464  tok::kw___is_destructible,
1465  tok::kw___is_empty,
1466  tok::kw___is_enum,
1467  tok::kw___is_floating_point,
1468  tok::kw___is_final,
1469  tok::kw___is_function,
1470  tok::kw___is_fundamental,
1471  tok::kw___is_integral,
1472  tok::kw___is_interface_class,
1473  tok::kw___is_literal,
1474  tok::kw___is_lvalue_expr,
1475  tok::kw___is_lvalue_reference,
1476  tok::kw___is_member_function_pointer,
1477  tok::kw___is_member_object_pointer,
1478  tok::kw___is_member_pointer,
1479  tok::kw___is_nothrow_assignable,
1480  tok::kw___is_nothrow_constructible,
1481  tok::kw___is_nothrow_destructible,
1482  tok::kw___is_object,
1483  tok::kw___is_pod,
1484  tok::kw___is_pointer,
1485  tok::kw___is_polymorphic,
1486  tok::kw___is_reference,
1487  tok::kw___is_rvalue_expr,
1488  tok::kw___is_rvalue_reference,
1489  tok::kw___is_same,
1490  tok::kw___is_scalar,
1491  tok::kw___is_sealed,
1492  tok::kw___is_signed,
1493  tok::kw___is_standard_layout,
1494  tok::kw___is_trivial,
1495  tok::kw___is_trivially_assignable,
1496  tok::kw___is_trivially_constructible,
1497  tok::kw___is_trivially_copyable,
1498  tok::kw___is_union,
1499  tok::kw___is_unsigned,
1500  tok::kw___is_void,
1501  tok::kw___is_volatile))
1502  // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1503  // name of struct templates, but some are keywords in GCC >= 4.3
1504  // and Clang. Therefore, when we see the token sequence "struct
1505  // X", make X into a normal identifier rather than a keyword, to
1506  // allow libstdc++ 4.2 and libc++ to work properly.
1507  TryKeywordIdentFallback(true);
1508 
1509  struct PreserveAtomicIdentifierInfoRAII {
1510  PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled)
1511  : AtomicII(nullptr) {
1512  if (!Enabled)
1513  return;
1514  assert(Tok.is(tok::kw__Atomic));
1515  AtomicII = Tok.getIdentifierInfo();
1516  AtomicII->revertTokenIDToIdentifier();
1517  Tok.setKind(tok::identifier);
1518  }
1519  ~PreserveAtomicIdentifierInfoRAII() {
1520  if (!AtomicII)
1521  return;
1522  AtomicII->revertIdentifierToTokenID(tok::kw__Atomic);
1523  }
1524  IdentifierInfo *AtomicII;
1525  };
1526 
1527  // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
1528  // implementation for VS2013 uses _Atomic as an identifier for one of the
1529  // classes in <atomic>. When we are parsing 'struct _Atomic', don't consider
1530  // '_Atomic' to be a keyword. We are careful to undo this so that clang can
1531  // use '_Atomic' in its own header files.
1532  bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat &&
1533  Tok.is(tok::kw__Atomic) &&
1534  TagType == DeclSpec::TST_struct;
1535  PreserveAtomicIdentifierInfoRAII AtomicTokenGuard(
1536  Tok, ShouldChangeAtomicToIdentifier);
1537 
1538  // Parse the (optional) nested-name-specifier.
1539  CXXScopeSpec &SS = DS.getTypeSpecScope();
1540  if (getLangOpts().CPlusPlus) {
1541  // "FOO : BAR" is not a potential typo for "FOO::BAR". In this context it
1542  // is a base-specifier-list.
1544 
1545  CXXScopeSpec Spec;
1546  bool HasValidSpec = true;
1547  if (ParseOptionalCXXScopeSpecifier(Spec, nullptr, EnteringContext)) {
1548  DS.SetTypeSpecError();
1549  HasValidSpec = false;
1550  }
1551  if (Spec.isSet())
1552  if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) {
1553  Diag(Tok, diag::err_expected) << tok::identifier;
1554  HasValidSpec = false;
1555  }
1556  if (HasValidSpec)
1557  SS = Spec;
1558  }
1559 
1560  TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1561 
1562  auto RecoverFromUndeclaredTemplateName = [&](IdentifierInfo *Name,
1563  SourceLocation NameLoc,
1564  SourceRange TemplateArgRange,
1565  bool KnownUndeclared) {
1566  Diag(NameLoc, diag::err_explicit_spec_non_template)
1567  << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1568  << TagTokKind << Name << TemplateArgRange << KnownUndeclared;
1569 
1570  // Strip off the last template parameter list if it was empty, since
1571  // we've removed its template argument list.
1572  if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1573  if (TemplateParams->size() > 1) {
1574  TemplateParams->pop_back();
1575  } else {
1576  TemplateParams = nullptr;
1577  const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
1578  ParsedTemplateInfo::NonTemplate;
1579  }
1580  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1581  // Pretend this is just a forward declaration.
1582  TemplateParams = nullptr;
1583  const_cast<ParsedTemplateInfo &>(TemplateInfo).Kind =
1584  ParsedTemplateInfo::NonTemplate;
1585  const_cast<ParsedTemplateInfo &>(TemplateInfo).TemplateLoc =
1586  SourceLocation();
1587  const_cast<ParsedTemplateInfo &>(TemplateInfo).ExternLoc =
1588  SourceLocation();
1589  }
1590  };
1591 
1592  // Parse the (optional) class name or simple-template-id.
1593  IdentifierInfo *Name = nullptr;
1594  SourceLocation NameLoc;
1595  TemplateIdAnnotation *TemplateId = nullptr;
1596  if (Tok.is(tok::identifier)) {
1597  Name = Tok.getIdentifierInfo();
1598  NameLoc = ConsumeToken();
1599 
1600  if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1601  // The name was supposed to refer to a template, but didn't.
1602  // Eat the template argument list and try to continue parsing this as
1603  // a class (or template thereof).
1604  TemplateArgList TemplateArgs;
1605  SourceLocation LAngleLoc, RAngleLoc;
1606  if (ParseTemplateIdAfterTemplateName(true, LAngleLoc, TemplateArgs,
1607  RAngleLoc)) {
1608  // We couldn't parse the template argument list at all, so don't
1609  // try to give any location information for the list.
1610  LAngleLoc = RAngleLoc = SourceLocation();
1611  }
1612  RecoverFromUndeclaredTemplateName(
1613  Name, NameLoc, SourceRange(LAngleLoc, RAngleLoc), false);
1614  }
1615  } else if (Tok.is(tok::annot_template_id)) {
1616  TemplateId = takeTemplateIdAnnotation(Tok);
1617  NameLoc = ConsumeAnnotationToken();
1618 
1619  if (TemplateId->Kind == TNK_Undeclared_template) {
1620  // Try to resolve the template name to a type template.
1621  Actions.ActOnUndeclaredTypeTemplateName(getCurScope(), TemplateId->Template,
1622  TemplateId->Kind, NameLoc, Name);
1623  if (TemplateId->Kind == TNK_Undeclared_template) {
1624  RecoverFromUndeclaredTemplateName(
1625  Name, NameLoc,
1626  SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc), true);
1627  TemplateId = nullptr;
1628  }
1629  }
1630 
1631  if (TemplateId && TemplateId->Kind != TNK_Type_template &&
1632  TemplateId->Kind != TNK_Dependent_template_name) {
1633  // The template-name in the simple-template-id refers to
1634  // something other than a class template. Give an appropriate
1635  // error message and skip to the ';'.
1636  SourceRange Range(NameLoc);
1637  if (SS.isNotEmpty())
1638  Range.setBegin(SS.getBeginLoc());
1639 
1640  // FIXME: Name may be null here.
1641  Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1642  << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;
1643 
1644  DS.SetTypeSpecError();
1645  SkipUntil(tok::semi, StopBeforeMatch);
1646  return;
1647  }
1648  }
1649 
1650  // There are four options here.
1651  // - If we are in a trailing return type, this is always just a reference,
1652  // and we must not try to parse a definition. For instance,
1653  // [] () -> struct S { };
1654  // does not define a type.
1655  // - If we have 'struct foo {...', 'struct foo :...',
1656  // 'struct foo final :' or 'struct foo final {', then this is a definition.
1657  // - If we have 'struct foo;', then this is either a forward declaration
1658  // or a friend declaration, which have to be treated differently.
1659  // - Otherwise we have something like 'struct foo xyz', a reference.
1660  //
1661  // We also detect these erroneous cases to provide better diagnostic for
1662  // C++11 attributes parsing.
1663  // - attributes follow class name:
1664  // struct foo [[]] {};
1665  // - attributes appear before or after 'final':
1666  // struct foo [[]] final [[]] {};
1667  //
1668  // However, in type-specifier-seq's, things look like declarations but are
1669  // just references, e.g.
1670  // new struct s;
1671  // or
1672  // &T::operator struct s;
1673  // For these, DSC is DeclSpecContext::DSC_type_specifier or
1674  // DeclSpecContext::DSC_alias_declaration.
1675 
1676  // If there are attributes after class name, parse them.
1677  MaybeParseCXX11Attributes(Attributes);
1678 
1679  const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1680  Sema::TagUseKind TUK;
1681  if (DSC == DeclSpecContext::DSC_trailing)
1682  TUK = Sema::TUK_Reference;
1683  else if (Tok.is(tok::l_brace) ||
1684  (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1685  (isCXX11FinalKeyword() &&
1686  (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1687  if (DS.isFriendSpecified()) {
1688  // C++ [class.friend]p2:
1689  // A class shall not be defined in a friend declaration.
1690  Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1691  << SourceRange(DS.getFriendSpecLoc());
1692 
1693  // Skip everything up to the semicolon, so that this looks like a proper
1694  // friend class (or template thereof) declaration.
1695  SkipUntil(tok::semi, StopBeforeMatch);
1696  TUK = Sema::TUK_Friend;
1697  } else {
1698  // Okay, this is a class definition.
1699  TUK = Sema::TUK_Definition;
1700  }
1701  } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) ||
1702  NextToken().is(tok::kw_alignas))) {
1703  // We can't tell if this is a definition or reference
1704  // until we skipped the 'final' and C++11 attribute specifiers.
1705  TentativeParsingAction PA(*this);
1706 
1707  // Skip the 'final' keyword.
1708  ConsumeToken();
1709 
1710  // Skip C++11 attribute specifiers.
1711  while (true) {
1712  if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
1713  ConsumeBracket();
1714  if (!SkipUntil(tok::r_square, StopAtSemi))
1715  break;
1716  } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
1717  ConsumeToken();
1718  ConsumeParen();
1719  if (!SkipUntil(tok::r_paren, StopAtSemi))
1720  break;
1721  } else {
1722  break;
1723  }
1724  }
1725 
1726  if (Tok.isOneOf(tok::l_brace, tok::colon))
1727  TUK = Sema::TUK_Definition;
1728  else
1729  TUK = Sema::TUK_Reference;
1730 
1731  PA.Revert();
1732  } else if (!isTypeSpecifier(DSC) &&
1733  (Tok.is(tok::semi) ||
1734  (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1736  if (Tok.isNot(tok::semi)) {
1737  const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1738  // A semicolon was missing after this declaration. Diagnose and recover.
1739  ExpectAndConsume(tok::semi, diag::err_expected_after,
1740  DeclSpec::getSpecifierName(TagType, PPol));
1741  PP.EnterToken(Tok, /*IsReinject*/true);
1742  Tok.setKind(tok::semi);
1743  }
1744  } else
1745  TUK = Sema::TUK_Reference;
1746 
1747  // Forbid misplaced attributes. In cases of a reference, we pass attributes
1748  // to caller to handle.
1749  if (TUK != Sema::TUK_Reference) {
1750  // If this is not a reference, then the only possible
1751  // valid place for C++11 attributes to appear here
1752  // is between class-key and class-name. If there are
1753  // any attributes after class-name, we try a fixit to move
1754  // them to the right place.
1755  SourceRange AttrRange = Attributes.Range;
1756  if (AttrRange.isValid()) {
1757  Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
1758  << AttrRange
1759  << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
1760  CharSourceRange(AttrRange, true))
1761  << FixItHint::CreateRemoval(AttrRange);
1762 
1763  // Recover by adding misplaced attributes to the attribute list
1764  // of the class so they can be applied on the class later.
1765  attrs.takeAllFrom(Attributes);
1766  }
1767  }
1768 
1769  // If this is an elaborated type specifier, and we delayed
1770  // diagnostics before, just merge them into the current pool.
1771  if (shouldDelayDiagsInTag) {
1772  diagsFromTag.done();
1773  if (TUK == Sema::TUK_Reference)
1774  diagsFromTag.redelay();
1775  }
1776 
1777  if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1778  TUK != Sema::TUK_Definition)) {
1779  if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1780  // We have a declaration or reference to an anonymous class.
1781  Diag(StartLoc, diag::err_anon_type_definition)
1782  << DeclSpec::getSpecifierName(TagType, Policy);
1783  }
1784 
1785  // If we are parsing a definition and stop at a base-clause, continue on
1786  // until the semicolon. Continuing from the comma will just trick us into
1787  // thinking we are seeing a variable declaration.
1788  if (TUK == Sema::TUK_Definition && Tok.is(tok::colon))
1789  SkipUntil(tok::semi, StopBeforeMatch);
1790  else
1791  SkipUntil(tok::comma, StopAtSemi);
1792  return;
1793  }
1794 
1795  // Create the tag portion of the class or class template.
1796  DeclResult TagOrTempResult = true; // invalid
1797  TypeResult TypeResult = true; // invalid
1798 
1799  bool Owned = false;
1800  Sema::SkipBodyInfo SkipBody;
1801  if (TemplateId) {
1802  // Explicit specialization, class template partial specialization,
1803  // or explicit instantiation.
1804  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1805  TemplateId->NumArgs);
1806  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1807  TUK == Sema::TUK_Declaration) {
1808  // This is an explicit instantiation of a class template.
1809  ProhibitAttributes(attrs);
1810 
1811  TagOrTempResult = Actions.ActOnExplicitInstantiation(
1812  getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
1813  TagType, StartLoc, SS, TemplateId->Template,
1814  TemplateId->TemplateNameLoc, TemplateId->LAngleLoc, TemplateArgsPtr,
1815  TemplateId->RAngleLoc, attrs);
1816 
1817  // Friend template-ids are treated as references unless
1818  // they have template headers, in which case they're ill-formed
1819  // (FIXME: "template <class T> friend class A<T>::B<int>;").
1820  // We diagnose this error in ActOnClassTemplateSpecialization.
1821  } else if (TUK == Sema::TUK_Reference ||
1822  (TUK == Sema::TUK_Friend &&
1823  TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1824  ProhibitAttributes(attrs);
1825  TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1826  TemplateId->SS,
1827  TemplateId->TemplateKWLoc,
1828  TemplateId->Template,
1829  TemplateId->TemplateNameLoc,
1830  TemplateId->LAngleLoc,
1831  TemplateArgsPtr,
1832  TemplateId->RAngleLoc);
1833  } else {
1834  // This is an explicit specialization or a class template
1835  // partial specialization.
1836  TemplateParameterLists FakedParamLists;
1837  if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1838  // This looks like an explicit instantiation, because we have
1839  // something like
1840  //
1841  // template class Foo<X>
1842  //
1843  // but it actually has a definition. Most likely, this was
1844  // meant to be an explicit specialization, but the user forgot
1845  // the '<>' after 'template'.
1846  // It this is friend declaration however, since it cannot have a
1847  // template header, it is most likely that the user meant to
1848  // remove the 'template' keyword.
1849  assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&
1850  "Expected a definition here");
1851 
1852  if (TUK == Sema::TUK_Friend) {
1853  Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation);
1854  TemplateParams = nullptr;
1855  } else {
1856  SourceLocation LAngleLoc =
1857  PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1858  Diag(TemplateId->TemplateNameLoc,
1859  diag::err_explicit_instantiation_with_definition)
1860  << SourceRange(TemplateInfo.TemplateLoc)
1861  << FixItHint::CreateInsertion(LAngleLoc, "<>");
1862 
1863  // Create a fake template parameter list that contains only
1864  // "template<>", so that we treat this construct as a class
1865  // template specialization.
1866  FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
1867  0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
1868  LAngleLoc, nullptr));
1869  TemplateParams = &FakedParamLists;
1870  }
1871  }
1872 
1873  // Build the class template specialization.
1874  TagOrTempResult = Actions.ActOnClassTemplateSpecialization(
1875  getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(),
1876  *TemplateId, attrs,
1877  MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0]
1878  : nullptr,
1879  TemplateParams ? TemplateParams->size() : 0),
1880  &SkipBody);
1881  }
1882  } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1883  TUK == Sema::TUK_Declaration) {
1884  // Explicit instantiation of a member of a class template
1885  // specialization, e.g.,
1886  //
1887  // template struct Outer<int>::Inner;
1888  //
1889  ProhibitAttributes(attrs);
1890 
1891  TagOrTempResult = Actions.ActOnExplicitInstantiation(
1892  getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc,
1893  TagType, StartLoc, SS, Name, NameLoc, attrs);
1894  } else if (TUK == Sema::TUK_Friend &&
1895  TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1896  ProhibitAttributes(attrs);
1897 
1898  TagOrTempResult = Actions.ActOnTemplatedFriendTag(
1899  getCurScope(), DS.getFriendSpecLoc(), TagType, StartLoc, SS, Name,
1900  NameLoc, attrs,
1901  MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0] : nullptr,
1902  TemplateParams ? TemplateParams->size() : 0));
1903  } else {
1904  if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1905  ProhibitAttributes(attrs);
1906 
1907  if (TUK == Sema::TUK_Definition &&
1908  TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1909  // If the declarator-id is not a template-id, issue a diagnostic and
1910  // recover by ignoring the 'template' keyword.
1911  Diag(Tok, diag::err_template_defn_explicit_instantiation)
1912  << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
1913  TemplateParams = nullptr;
1914  }
1915 
1916  bool IsDependent = false;
1917 
1918  // Don't pass down template parameter lists if this is just a tag
1919  // reference. For example, we don't need the template parameters here:
1920  // template <class T> class A *makeA(T t);
1921  MultiTemplateParamsArg TParams;
1922  if (TUK != Sema::TUK_Reference && TemplateParams)
1923  TParams =
1924  MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1925 
1926  stripTypeAttributesOffDeclSpec(attrs, DS, TUK);
1927 
1928  // Declaration or definition of a class type
1929  TagOrTempResult = Actions.ActOnTag(
1930  getCurScope(), TagType, TUK, StartLoc, SS, Name, NameLoc, attrs, AS,
1931  DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent,
1932  SourceLocation(), false, clang::TypeResult(),
1933  DSC == DeclSpecContext::DSC_type_specifier,
1934  DSC == DeclSpecContext::DSC_template_param ||
1935  DSC == DeclSpecContext::DSC_template_type_arg,
1936  &SkipBody);
1937 
1938  // If ActOnTag said the type was dependent, try again with the
1939  // less common call.
1940  if (IsDependent) {
1941  assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1942  TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1943  SS, Name, StartLoc, NameLoc);
1944  }
1945  }
1946 
1947  // If there is a body, parse it and inform the actions module.
1948  if (TUK == Sema::TUK_Definition) {
1949  assert(Tok.is(tok::l_brace) ||
1950  (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1951  isCXX11FinalKeyword());
1952  if (SkipBody.ShouldSkip)
1953  SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType,
1954  TagOrTempResult.get());
1955  else if (getLangOpts().CPlusPlus)
1956  ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
1957  TagOrTempResult.get());
1958  else {
1959  Decl *D =
1960  SkipBody.CheckSameAsPrevious ? SkipBody.New : TagOrTempResult.get();
1961  // Parse the definition body.
1962  ParseStructUnionBody(StartLoc, TagType, D);
1963  if (SkipBody.CheckSameAsPrevious &&
1964  !Actions.ActOnDuplicateDefinition(DS, TagOrTempResult.get(),
1965  SkipBody)) {
1966  DS.SetTypeSpecError();
1967  return;
1968  }
1969  }
1970  }
1971 
1972  if (!TagOrTempResult.isInvalid())
1973  // Delayed processing of attributes.
1974  Actions.ProcessDeclAttributeDelayed(TagOrTempResult.get(), attrs);
1975 
1976  const char *PrevSpec = nullptr;
1977  unsigned DiagID;
1978  bool Result;
1979  if (!TypeResult.isInvalid()) {
1980  Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1981  NameLoc.isValid() ? NameLoc : StartLoc,
1982  PrevSpec, DiagID, TypeResult.get(), Policy);
1983  } else if (!TagOrTempResult.isInvalid()) {
1984  Result = DS.SetTypeSpecType(TagType, StartLoc,
1985  NameLoc.isValid() ? NameLoc : StartLoc,
1986  PrevSpec, DiagID, TagOrTempResult.get(), Owned,
1987  Policy);
1988  } else {
1989  DS.SetTypeSpecError();
1990  return;
1991  }
1992 
1993  if (Result)
1994  Diag(StartLoc, DiagID) << PrevSpec;
1995 
1996  // At this point, we've successfully parsed a class-specifier in 'definition'
1997  // form (e.g. "struct foo { int x; }". While we could just return here, we're
1998  // going to look at what comes after it to improve error recovery. If an
1999  // impossible token occurs next, we assume that the programmer forgot a ; at
2000  // the end of the declaration and recover that way.
2001  //
2002  // Also enforce C++ [temp]p3:
2003  // In a template-declaration which defines a class, no declarator
2004  // is permitted.
2005  //
2006  // After a type-specifier, we don't expect a semicolon. This only happens in
2007  // C, since definitions are not permitted in this context in C++.
2008  if (TUK == Sema::TUK_Definition &&
2009  (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) &&
2010  (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
2011  if (Tok.isNot(tok::semi)) {
2012  const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
2013  ExpectAndConsume(tok::semi, diag::err_expected_after,
2014  DeclSpec::getSpecifierName(TagType, PPol));
2015  // Push this token back into the preprocessor and change our current token
2016  // to ';' so that the rest of the code recovers as though there were an
2017  // ';' after the definition.
2018  PP.EnterToken(Tok, /*IsReinject=*/true);
2019  Tok.setKind(tok::semi);
2020  }
2021  }
2022 }
2023 
2024 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
2025 ///
2026 /// base-clause : [C++ class.derived]
2027 /// ':' base-specifier-list
2028 /// base-specifier-list:
2029 /// base-specifier '...'[opt]
2030 /// base-specifier-list ',' base-specifier '...'[opt]
2031 void Parser::ParseBaseClause(Decl *ClassDecl) {
2032  assert(Tok.is(tok::colon) && "Not a base clause");
2033  ConsumeToken();
2034 
2035  // Build up an array of parsed base specifiers.
2037 
2038  while (true) {
2039  // Parse a base-specifier.
2040  BaseResult Result = ParseBaseSpecifier(ClassDecl);
2041  if (Result.isInvalid()) {
2042  // Skip the rest of this base specifier, up until the comma or
2043  // opening brace.
2044  SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch);
2045  } else {
2046  // Add this to our array of base specifiers.
2047  BaseInfo.push_back(Result.get());
2048  }
2049 
2050  // If the next token is a comma, consume it and keep reading
2051  // base-specifiers.
2052  if (!TryConsumeToken(tok::comma))
2053  break;
2054  }
2055 
2056  // Attach the base specifiers
2057  Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo);
2058 }
2059 
2060 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
2061 /// one entry in the base class list of a class specifier, for example:
2062 /// class foo : public bar, virtual private baz {
2063 /// 'public bar' and 'virtual private baz' are each base-specifiers.
2064 ///
2065 /// base-specifier: [C++ class.derived]
2066 /// attribute-specifier-seq[opt] base-type-specifier
2067 /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
2068 /// base-type-specifier
2069 /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
2070 /// base-type-specifier
2071 BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
2072  bool IsVirtual = false;
2073  SourceLocation StartLoc = Tok.getLocation();
2074 
2075  ParsedAttributesWithRange Attributes(AttrFactory);
2076  MaybeParseCXX11Attributes(Attributes);
2077 
2078  // Parse the 'virtual' keyword.
2079  if (TryConsumeToken(tok::kw_virtual))
2080  IsVirtual = true;
2081 
2082  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2083 
2084  // Parse an (optional) access specifier.
2085  AccessSpecifier Access = getAccessSpecifierIfPresent();
2086  if (Access != AS_none)
2087  ConsumeToken();
2088 
2089  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2090 
2091  // Parse the 'virtual' keyword (again!), in case it came after the
2092  // access specifier.
2093  if (Tok.is(tok::kw_virtual)) {
2094  SourceLocation VirtualLoc = ConsumeToken();
2095  if (IsVirtual) {
2096  // Complain about duplicate 'virtual'
2097  Diag(VirtualLoc, diag::err_dup_virtual)
2098  << FixItHint::CreateRemoval(VirtualLoc);
2099  }
2100 
2101  IsVirtual = true;
2102  }
2103 
2104  CheckMisplacedCXX11Attribute(Attributes, StartLoc);
2105 
2106  // Parse the class-name.
2107 
2108  // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
2109  // implementation for VS2013 uses _Atomic as an identifier for one of the
2110  // classes in <atomic>. Treat '_Atomic' to be an identifier when we are
2111  // parsing the class-name for a base specifier.
2112  if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
2113  NextToken().is(tok::less))
2114  Tok.setKind(tok::identifier);
2115 
2116  SourceLocation EndLocation;
2117  SourceLocation BaseLoc;
2118  TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
2119  if (BaseType.isInvalid())
2120  return true;
2121 
2122  // Parse the optional ellipsis (for a pack expansion). The ellipsis is
2123  // actually part of the base-specifier-list grammar productions, but we
2124  // parse it here for convenience.
2125  SourceLocation EllipsisLoc;
2126  TryConsumeToken(tok::ellipsis, EllipsisLoc);
2127 
2128  // Find the complete source range for the base-specifier.
2129  SourceRange Range(StartLoc, EndLocation);
2130 
2131  // Notify semantic analysis that we have parsed a complete
2132  // base-specifier.
2133  return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
2134  Access, BaseType.get(), BaseLoc,
2135  EllipsisLoc);
2136 }
2137 
2138 /// getAccessSpecifierIfPresent - Determine whether the next token is
2139 /// a C++ access-specifier.
2140 ///
2141 /// access-specifier: [C++ class.derived]
2142 /// 'private'
2143 /// 'protected'
2144 /// 'public'
2145 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
2146  switch (Tok.getKind()) {
2147  default: return AS_none;
2148  case tok::kw_private: return AS_private;
2149  case tok::kw_protected: return AS_protected;
2150  case tok::kw_public: return AS_public;
2151  }
2152 }
2153 
2154 /// If the given declarator has any parts for which parsing has to be
2155 /// delayed, e.g., default arguments or an exception-specification, create a
2156 /// late-parsed method declaration record to handle the parsing at the end of
2157 /// the class definition.
2158 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
2159  Decl *ThisDecl) {
2161  = DeclaratorInfo.getFunctionTypeInfo();
2162  // If there was a late-parsed exception-specification, we'll need a
2163  // late parse
2164  bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed;
2165 
2166  if (!NeedLateParse) {
2167  // Look ahead to see if there are any default args
2168  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) {
2169  auto Param = cast<ParmVarDecl>(FTI.Params[ParamIdx].Param);
2170  if (Param->hasUnparsedDefaultArg()) {
2171  NeedLateParse = true;
2172  break;
2173  }
2174  }
2175  }
2176 
2177  if (NeedLateParse) {
2178  // Push this method onto the stack of late-parsed method
2179  // declarations.
2180  auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
2181  getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
2182  LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
2183 
2184  // Stash the exception-specification tokens in the late-pased method.
2185  LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
2186  FTI.ExceptionSpecTokens = nullptr;
2187 
2188  // Push tokens for each parameter. Those that do not have
2189  // defaults will be NULL.
2190  LateMethod->DefaultArgs.reserve(FTI.NumParams);
2191  for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx)
2192  LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument(
2193  FTI.Params[ParamIdx].Param,
2194  std::move(FTI.Params[ParamIdx].DefaultArgTokens)));
2195  }
2196 }
2197 
2198 /// isCXX11VirtSpecifier - Determine whether the given token is a C++11
2199 /// virt-specifier.
2200 ///
2201 /// virt-specifier:
2202 /// override
2203 /// final
2204 /// __final
2205 VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
2206  if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier))
2207  return VirtSpecifiers::VS_None;
2208 
2209  IdentifierInfo *II = Tok.getIdentifierInfo();
2210 
2211  // Initialize the contextual keywords.
2212  if (!Ident_final) {
2213  Ident_final = &PP.getIdentifierTable().get("final");
2214  if (getLangOpts().GNUKeywords)
2215  Ident_GNU_final = &PP.getIdentifierTable().get("__final");
2216  if (getLangOpts().MicrosoftExt)
2217  Ident_sealed = &PP.getIdentifierTable().get("sealed");
2218  Ident_override = &PP.getIdentifierTable().get("override");
2219  }
2220 
2221  if (II == Ident_override)
2223 
2224  if (II == Ident_sealed)
2226 
2227  if (II == Ident_final)
2228  return VirtSpecifiers::VS_Final;
2229 
2230  if (II == Ident_GNU_final)
2232 
2233  return VirtSpecifiers::VS_None;
2234 }
2235 
2236 /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
2237 ///
2238 /// virt-specifier-seq:
2239 /// virt-specifier
2240 /// virt-specifier-seq virt-specifier
2241 void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
2242  bool IsInterface,
2243  SourceLocation FriendLoc) {
2244  while (true) {
2245  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2246  if (Specifier == VirtSpecifiers::VS_None)
2247  return;
2248 
2249  if (FriendLoc.isValid()) {
2250  Diag(Tok.getLocation(), diag::err_friend_decl_spec)
2251  << VirtSpecifiers::getSpecifierName(Specifier)
2253  << SourceRange(FriendLoc, FriendLoc);
2254  ConsumeToken();
2255  continue;
2256  }
2257 
2258  // C++ [class.mem]p8:
2259  // A virt-specifier-seq shall contain at most one of each virt-specifier.
2260  const char *PrevSpec = nullptr;
2261  if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
2262  Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
2263  << PrevSpec
2265 
2266  if (IsInterface && (Specifier == VirtSpecifiers::VS_Final ||
2267  Specifier == VirtSpecifiers::VS_Sealed)) {
2268  Diag(Tok.getLocation(), diag::err_override_control_interface)
2269  << VirtSpecifiers::getSpecifierName(Specifier);
2270  } else if (Specifier == VirtSpecifiers::VS_Sealed) {
2271  Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword);
2272  } else if (Specifier == VirtSpecifiers::VS_GNU_Final) {
2273  Diag(Tok.getLocation(), diag::ext_warn_gnu_final);
2274  } else {
2275  Diag(Tok.getLocation(),
2276  getLangOpts().CPlusPlus11
2277  ? diag::warn_cxx98_compat_override_control_keyword
2278  : diag::ext_override_control_keyword)
2279  << VirtSpecifiers::getSpecifierName(Specifier);
2280  }
2281  ConsumeToken();
2282  }
2283 }
2284 
2285 /// isCXX11FinalKeyword - Determine whether the next token is a C++11
2286 /// 'final' or Microsoft 'sealed' contextual keyword.
2287 bool Parser::isCXX11FinalKeyword() const {
2288  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2289  return Specifier == VirtSpecifiers::VS_Final ||
2290  Specifier == VirtSpecifiers::VS_GNU_Final ||
2291  Specifier == VirtSpecifiers::VS_Sealed;
2292 }
2293 
2294 /// Parse a C++ member-declarator up to, but not including, the optional
2295 /// brace-or-equal-initializer or pure-specifier.
2296 bool Parser::ParseCXXMemberDeclaratorBeforeInitializer(
2297  Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize,
2298  LateParsedAttrList &LateParsedAttrs) {
2299  // member-declarator:
2300  // declarator pure-specifier[opt]
2301  // declarator brace-or-equal-initializer[opt]
2302  // identifier[opt] ':' constant-expression
2303  if (Tok.isNot(tok::colon))
2304  ParseDeclarator(DeclaratorInfo);
2305  else
2306  DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation());
2307 
2308  if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) {
2309  assert(DeclaratorInfo.isPastIdentifier() &&
2310  "don't know where identifier would go yet?");
2311  BitfieldSize = ParseConstantExpression();
2312  if (BitfieldSize.isInvalid())
2313  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2314  } else {
2315  ParseOptionalCXX11VirtSpecifierSeq(
2316  VS, getCurrentClass().IsInterface,
2317  DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2318  if (!VS.isUnset())
2319  MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2320  }
2321 
2322  // If a simple-asm-expr is present, parse it.
2323  if (Tok.is(tok::kw_asm)) {
2324  SourceLocation Loc;
2325  ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2326  if (AsmLabel.isInvalid())
2327  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2328 
2329  DeclaratorInfo.setAsmLabel(AsmLabel.get());
2330  DeclaratorInfo.SetRangeEnd(Loc);
2331  }
2332 
2333  // If attributes exist after the declarator, but before an '{', parse them.
2334  MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2335 
2336  // For compatibility with code written to older Clang, also accept a
2337  // virt-specifier *after* the GNU attributes.
2338  if (BitfieldSize.isUnset() && VS.isUnset()) {
2339  ParseOptionalCXX11VirtSpecifierSeq(
2340  VS, getCurrentClass().IsInterface,
2341  DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2342  if (!VS.isUnset()) {
2343  // If we saw any GNU-style attributes that are known to GCC followed by a
2344  // virt-specifier, issue a GCC-compat warning.
2345  for (const ParsedAttr &AL : DeclaratorInfo.getAttributes())
2346  if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
2347  Diag(AL.getLoc(), diag::warn_gcc_attribute_location);
2348 
2349  MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2350  }
2351  }
2352 
2353  // If this has neither a name nor a bit width, something has gone seriously
2354  // wrong. Skip until the semi-colon or }.
2355  if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) {
2356  // If so, skip until the semi-colon or a }.
2357  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2358  return true;
2359  }
2360  return false;
2361 }
2362 
2363 /// Look for declaration specifiers possibly occurring after C++11
2364 /// virt-specifier-seq and diagnose them.
2365 void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(
2366  Declarator &D,
2367  VirtSpecifiers &VS) {
2368  DeclSpec DS(AttrFactory);
2369 
2370  // GNU-style and C++11 attributes are not allowed here, but they will be
2371  // handled by the caller. Diagnose everything else.
2372  ParseTypeQualifierListOpt(
2373  DS, AR_NoAttributesParsed, false,
2374  /*IdentifierRequired=*/false, llvm::function_ref<void()>([&]() {
2375  Actions.CodeCompleteFunctionQualifiers(DS, D, &VS);
2376  }));
2377  D.ExtendWithDeclSpec(DS);
2378 
2379  if (D.isFunctionDeclarator()) {
2380  auto &Function = D.getFunctionTypeInfo();
2382  auto DeclSpecCheck = [&](DeclSpec::TQ TypeQual, StringRef FixItName,
2383  SourceLocation SpecLoc) {
2384  FixItHint Insertion;
2385  auto &MQ = Function.getOrCreateMethodQualifiers();
2386  if (!(MQ.getTypeQualifiers() & TypeQual)) {
2387  std::string Name(FixItName.data());
2388  Name += " ";
2389  Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2390  MQ.SetTypeQual(TypeQual, SpecLoc);
2391  }
2392  Diag(SpecLoc, diag::err_declspec_after_virtspec)
2393  << FixItName
2395  << FixItHint::CreateRemoval(SpecLoc) << Insertion;
2396  };
2397  DS.forEachQualifier(DeclSpecCheck);
2398  }
2399 
2400  // Parse ref-qualifiers.
2401  bool RefQualifierIsLValueRef = true;
2402  SourceLocation RefQualifierLoc;
2403  if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) {
2404  const char *Name = (RefQualifierIsLValueRef ? "& " : "&& ");
2405  FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2406  Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef;
2407  Function.RefQualifierLoc = RefQualifierLoc.getRawEncoding();
2408 
2409  Diag(RefQualifierLoc, diag::err_declspec_after_virtspec)
2410  << (RefQualifierIsLValueRef ? "&" : "&&")
2412  << FixItHint::CreateRemoval(RefQualifierLoc)
2413  << Insertion;
2414  D.SetRangeEnd(RefQualifierLoc);
2415  }
2416  }
2417 }
2418 
2419 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
2420 ///
2421 /// member-declaration:
2422 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
2423 /// function-definition ';'[opt]
2424 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
2425 /// using-declaration [TODO]
2426 /// [C++0x] static_assert-declaration
2427 /// template-declaration
2428 /// [GNU] '__extension__' member-declaration
2429 ///
2430 /// member-declarator-list:
2431 /// member-declarator
2432 /// member-declarator-list ',' member-declarator
2433 ///
2434 /// member-declarator:
2435 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
2436 /// declarator constant-initializer[opt]
2437 /// [C++11] declarator brace-or-equal-initializer[opt]
2438 /// identifier[opt] ':' constant-expression
2439 ///
2440 /// virt-specifier-seq:
2441 /// virt-specifier
2442 /// virt-specifier-seq virt-specifier
2443 ///
2444 /// virt-specifier:
2445 /// override
2446 /// final
2447 /// [MS] sealed
2448 ///
2449 /// pure-specifier:
2450 /// '= 0'
2451 ///
2452 /// constant-initializer:
2453 /// '=' constant-expression
2454 ///
2456 Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
2457  ParsedAttributes &AccessAttrs,
2458  const ParsedTemplateInfo &TemplateInfo,
2459  ParsingDeclRAIIObject *TemplateDiags) {
2460  if (Tok.is(tok::at)) {
2461  if (getLangOpts().ObjC && NextToken().isObjCAtKeyword(tok::objc_defs))
2462  Diag(Tok, diag::err_at_defs_cxx);
2463  else
2464  Diag(Tok, diag::err_at_in_class);
2465 
2466  ConsumeToken();
2467  SkipUntil(tok::r_brace, StopAtSemi);
2468  return nullptr;
2469  }
2470 
2471  // Turn on colon protection early, while parsing declspec, although there is
2472  // nothing to protect there. It prevents from false errors if error recovery
2473  // incorrectly determines where the declspec ends, as in the example:
2474  // struct A { enum class B { C }; };
2475  // const int C = 4;
2476  // struct D { A::B : C; };
2478 
2479  // Access declarations.
2480  bool MalformedTypeSpec = false;
2481  if (!TemplateInfo.Kind &&
2482  Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
2484  MalformedTypeSpec = true;
2485 
2486  bool isAccessDecl;
2487  if (Tok.isNot(tok::annot_cxxscope))
2488  isAccessDecl = false;
2489  else if (NextToken().is(tok::identifier))
2490  isAccessDecl = GetLookAheadToken(2).is(tok::semi);
2491  else
2492  isAccessDecl = NextToken().is(tok::kw_operator);
2493 
2494  if (isAccessDecl) {
2495  // Collect the scope specifier token we annotated earlier.
2496  CXXScopeSpec SS;
2497  ParseOptionalCXXScopeSpecifier(SS, nullptr,
2498  /*EnteringContext=*/false);
2499 
2500  if (SS.isInvalid()) {
2501  SkipUntil(tok::semi);
2502  return nullptr;
2503  }
2504 
2505  // Try to parse an unqualified-id.
2506  SourceLocation TemplateKWLoc;
2507  UnqualifiedId Name;
2508  if (ParseUnqualifiedId(SS, false, true, true, false, nullptr,
2509  &TemplateKWLoc, Name)) {
2510  SkipUntil(tok::semi);
2511  return nullptr;
2512  }
2513 
2514  // TODO: recover from mistakenly-qualified operator declarations.
2515  if (ExpectAndConsume(tok::semi, diag::err_expected_after,
2516  "access declaration")) {
2517  SkipUntil(tok::semi);
2518  return nullptr;
2519  }
2520 
2521  // FIXME: We should do something with the 'template' keyword here.
2522  return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration(
2523  getCurScope(), AS, /*UsingLoc*/ SourceLocation(),
2524  /*TypenameLoc*/ SourceLocation(), SS, Name,
2525  /*EllipsisLoc*/ SourceLocation(),
2526  /*AttrList*/ ParsedAttributesView())));
2527  }
2528  }
2529 
2530  // static_assert-declaration. A templated static_assert declaration is
2531  // diagnosed in Parser::ParseSingleDeclarationAfterTemplate.
2532  if (!TemplateInfo.Kind &&
2533  Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) {
2534  SourceLocation DeclEnd;
2535  return DeclGroupPtrTy::make(
2536  DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd)));
2537  }
2538 
2539  if (Tok.is(tok::kw_template)) {
2540  assert(!TemplateInfo.TemplateParams &&
2541  "Nested template improperly parsed?");
2542  ObjCDeclContextSwitch ObjCDC(*this);
2543  SourceLocation DeclEnd;
2544  return DeclGroupPtrTy::make(
2545  DeclGroupRef(ParseTemplateDeclarationOrSpecialization(
2546  DeclaratorContext::MemberContext, DeclEnd, AccessAttrs, AS)));
2547  }
2548 
2549  // Handle: member-declaration ::= '__extension__' member-declaration
2550  if (Tok.is(tok::kw___extension__)) {
2551  // __extension__ silences extension warnings in the subexpression.
2552  ExtensionRAIIObject O(Diags); // Use RAII to do this.
2553  ConsumeToken();
2554  return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
2555  TemplateInfo, TemplateDiags);
2556  }
2557 
2558  ParsedAttributesWithRange attrs(AttrFactory);
2559  ParsedAttributesViewWithRange FnAttrs;
2560  // Optional C++11 attribute-specifier
2561  MaybeParseCXX11Attributes(attrs);
2562  // We need to keep these attributes for future diagnostic
2563  // before they are taken over by declaration specifier.
2564  FnAttrs.addAll(attrs.begin(), attrs.end());
2565  FnAttrs.Range = attrs.Range;
2566 
2567  MaybeParseMicrosoftAttributes(attrs);
2568 
2569  if (Tok.is(tok::kw_using)) {
2570  ProhibitAttributes(attrs);
2571 
2572  // Eat 'using'.
2573  SourceLocation UsingLoc = ConsumeToken();
2574 
2575  // Consume unexpected 'template' keywords.
2576  while (Tok.is(tok::kw_template)) {
2577  SourceLocation TemplateLoc = ConsumeToken();
2578  Diag(TemplateLoc, diag::err_unexpected_template_after_using)
2579  << FixItHint::CreateRemoval(TemplateLoc);
2580  }
2581 
2582  if (Tok.is(tok::kw_namespace)) {
2583  Diag(UsingLoc, diag::err_using_namespace_in_class);
2584  SkipUntil(tok::semi, StopBeforeMatch);
2585  return nullptr;
2586  }
2587  SourceLocation DeclEnd;
2588  // Otherwise, it must be a using-declaration or an alias-declaration.
2589  return ParseUsingDeclaration(DeclaratorContext::MemberContext, TemplateInfo,
2590  UsingLoc, DeclEnd, AS);
2591  }
2592 
2593  // Hold late-parsed attributes so we can attach a Decl to them later.
2594  LateParsedAttrList CommonLateParsedAttrs;
2595 
2596  // decl-specifier-seq:
2597  // Parse the common declaration-specifiers piece.
2598  ParsingDeclSpec DS(*this, TemplateDiags);
2599  DS.takeAttributesFrom(attrs);
2600  if (MalformedTypeSpec)
2601  DS.SetTypeSpecError();
2602 
2603  ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DeclSpecContext::DSC_class,
2604  &CommonLateParsedAttrs);
2605 
2606  // Turn off colon protection that was set for declspec.
2607  X.restore();
2608 
2609  // If we had a free-standing type definition with a missing semicolon, we
2610  // may get this far before the problem becomes obvious.
2611  if (DS.hasTagDefinition() &&
2612  TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate &&
2613  DiagnoseMissingSemiAfterTagDefinition(DS, AS, DeclSpecContext::DSC_class,
2614  &CommonLateParsedAttrs))
2615  return nullptr;
2616 
2617  MultiTemplateParamsArg TemplateParams(
2618  TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data()
2619  : nullptr,
2620  TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
2621 
2622  if (TryConsumeToken(tok::semi)) {
2623  if (DS.isFriendSpecified())
2624  ProhibitAttributes(FnAttrs);
2625 
2626  RecordDecl *AnonRecord = nullptr;
2627  Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
2628  getCurScope(), AS, DS, TemplateParams, false, AnonRecord);
2629  DS.complete(TheDecl);
2630  if (AnonRecord) {
2631  Decl* decls[] = {AnonRecord, TheDecl};
2632  return Actions.BuildDeclaratorGroup(decls);
2633  }
2634  return Actions.ConvertDeclToDeclGroup(TheDecl);
2635  }
2636 
2637  ParsingDeclarator DeclaratorInfo(*this, DS, DeclaratorContext::MemberContext);
2638  VirtSpecifiers VS;
2639 
2640  // Hold late-parsed attributes so we can attach a Decl to them later.
2641  LateParsedAttrList LateParsedAttrs;
2642 
2643  SourceLocation EqualLoc;
2644  SourceLocation PureSpecLoc;
2645 
2646  auto TryConsumePureSpecifier = [&] (bool AllowDefinition) {
2647  if (Tok.isNot(tok::equal))
2648  return false;
2649 
2650  auto &Zero = NextToken();
2651  SmallString<8> Buffer;
2652  if (Zero.isNot(tok::numeric_constant) || Zero.getLength() != 1 ||
2653  PP.getSpelling(Zero, Buffer) != "0")
2654  return false;
2655 
2656  auto &After = GetLookAheadToken(2);
2657  if (!After.isOneOf(tok::semi, tok::comma) &&
2658  !(AllowDefinition &&
2659  After.isOneOf(tok::l_brace, tok::colon, tok::kw_try)))
2660  return false;
2661 
2662  EqualLoc = ConsumeToken();
2663  PureSpecLoc = ConsumeToken();
2664  return true;
2665  };
2666 
2667  SmallVector<Decl *, 8> DeclsInGroup;
2668  ExprResult BitfieldSize;
2669  bool ExpectSemi = true;
2670 
2671  // Parse the first declarator.
2672  if (ParseCXXMemberDeclaratorBeforeInitializer(
2673  DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) {
2674  TryConsumeToken(tok::semi);
2675  return nullptr;
2676  }
2677 
2678  // Check for a member function definition.
2679  if (BitfieldSize.isUnset()) {
2680  // MSVC permits pure specifier on inline functions defined at class scope.
2681  // Hence check for =0 before checking for function definition.
2682  if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction())
2683  TryConsumePureSpecifier(/*AllowDefinition*/ true);
2684 
2685  FunctionDefinitionKind DefinitionKind = FDK_Declaration;
2686  // function-definition:
2687  //
2688  // In C++11, a non-function declarator followed by an open brace is a
2689  // braced-init-list for an in-class member initialization, not an
2690  // erroneous function definition.
2691  if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
2692  DefinitionKind = FDK_Definition;
2693  } else if (DeclaratorInfo.isFunctionDeclarator()) {
2694  if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) {
2695  DefinitionKind = FDK_Definition;
2696  } else if (Tok.is(tok::equal)) {
2697  const Token &KW = NextToken();
2698  if (KW.is(tok::kw_default))
2699  DefinitionKind = FDK_Defaulted;
2700  else if (KW.is(tok::kw_delete))
2701  DefinitionKind = FDK_Deleted;
2702  }
2703  }
2704  DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind);
2705 
2706  // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2707  // to a friend declaration, that declaration shall be a definition.
2708  if (DeclaratorInfo.isFunctionDeclarator() &&
2709  DefinitionKind != FDK_Definition && DS.isFriendSpecified()) {
2710  // Diagnose attributes that appear before decl specifier:
2711  // [[]] friend int foo();
2712  ProhibitAttributes(FnAttrs);
2713  }
2714 
2715  if (DefinitionKind != FDK_Declaration) {
2716  if (!DeclaratorInfo.isFunctionDeclarator()) {
2717  Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
2718  ConsumeBrace();
2719  SkipUntil(tok::r_brace);
2720 
2721  // Consume the optional ';'
2722  TryConsumeToken(tok::semi);
2723 
2724  return nullptr;
2725  }
2726 
2728  Diag(DeclaratorInfo.getIdentifierLoc(),
2729  diag::err_function_declared_typedef);
2730 
2731  // Recover by treating the 'typedef' as spurious.
2733  }
2734 
2735  Decl *FunDecl =
2736  ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
2737  VS, PureSpecLoc);
2738 
2739  if (FunDecl) {
2740  for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2741  CommonLateParsedAttrs[i]->addDecl(FunDecl);
2742  }
2743  for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2744  LateParsedAttrs[i]->addDecl(FunDecl);
2745  }
2746  }
2747  LateParsedAttrs.clear();
2748 
2749  // Consume the ';' - it's optional unless we have a delete or default
2750  if (Tok.is(tok::semi))
2751  ConsumeExtraSemi(AfterMemberFunctionDefinition);
2752 
2753  return DeclGroupPtrTy::make(DeclGroupRef(FunDecl));
2754  }
2755  }
2756 
2757  // member-declarator-list:
2758  // member-declarator
2759  // member-declarator-list ',' member-declarator
2760 
2761  while (1) {
2762  InClassInitStyle HasInClassInit = ICIS_NoInit;
2763  bool HasStaticInitializer = false;
2764  if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
2765  if (DeclaratorInfo.isDeclarationOfFunction()) {
2766  // It's a pure-specifier.
2767  if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false))
2768  // Parse it as an expression so that Sema can diagnose it.
2769  HasStaticInitializer = true;
2770  } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2772  DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2774  !DS.isFriendSpecified()) {
2775  // It's a default member initializer.
2776  if (BitfieldSize.get())
2777  Diag(Tok, getLangOpts().CPlusPlus2a
2778  ? diag::warn_cxx17_compat_bitfield_member_init
2779  : diag::ext_bitfield_member_init);
2780  HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2781  } else {
2782  HasStaticInitializer = true;
2783  }
2784  }
2785 
2786  // NOTE: If Sema is the Action module and declarator is an instance field,
2787  // this call will *not* return the created decl; It will return null.
2788  // See Sema::ActOnCXXMemberDeclarator for details.
2789 
2790  NamedDecl *ThisDecl = nullptr;
2791  if (DS.isFriendSpecified()) {
2792  // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2793  // to a friend declaration, that declaration shall be a definition.
2794  //
2795  // Diagnose attributes that appear in a friend member function declarator:
2796  // friend int foo [[]] ();
2798  DeclaratorInfo.getCXX11AttributeRanges(Ranges);
2799  for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
2800  E = Ranges.end(); I != E; ++I)
2801  Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I;
2802 
2803  ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2804  TemplateParams);
2805  } else {
2806  ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2807  DeclaratorInfo,
2808  TemplateParams,
2809  BitfieldSize.get(),
2810  VS, HasInClassInit);
2811 
2812  if (VarTemplateDecl *VT =
2813  ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : nullptr)
2814  // Re-direct this decl to refer to the templated decl so that we can
2815  // initialize it.
2816  ThisDecl = VT->getTemplatedDecl();
2817 
2818  if (ThisDecl)
2819  Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs);
2820  }
2821 
2822  // Error recovery might have converted a non-static member into a static
2823  // member.
2824  if (HasInClassInit != ICIS_NoInit &&
2825  DeclaratorInfo.getDeclSpec().getStorageClassSpec() ==
2827  HasInClassInit = ICIS_NoInit;
2828  HasStaticInitializer = true;
2829  }
2830 
2831  if (ThisDecl && PureSpecLoc.isValid())
2832  Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc);
2833 
2834  // Handle the initializer.
2835  if (HasInClassInit != ICIS_NoInit) {
2836  // The initializer was deferred; parse it and cache the tokens.
2838  ? diag::warn_cxx98_compat_nonstatic_member_init
2839  : diag::ext_nonstatic_member_init);
2840 
2841  if (DeclaratorInfo.isArrayOfUnknownBound()) {
2842  // C++11 [dcl.array]p3: An array bound may also be omitted when the
2843  // declarator is followed by an initializer.
2844  //
2845  // A brace-or-equal-initializer for a member-declarator is not an
2846  // initializer in the grammar, so this is ill-formed.
2847  Diag(Tok, diag::err_incomplete_array_member_init);
2848  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2849 
2850  // Avoid later warnings about a class member of incomplete type.
2851  if (ThisDecl)
2852  ThisDecl->setInvalidDecl();
2853  } else
2854  ParseCXXNonStaticMemberInitializer(ThisDecl);
2855  } else if (HasStaticInitializer) {
2856  // Normal initializer.
2857  ExprResult Init = ParseCXXMemberInitializer(
2858  ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2859 
2860  if (Init.isInvalid())
2861  SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2862  else if (ThisDecl)
2863  Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid());
2864  } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
2865  // No initializer.
2866  Actions.ActOnUninitializedDecl(ThisDecl);
2867 
2868  if (ThisDecl) {
2869  if (!ThisDecl->isInvalidDecl()) {
2870  // Set the Decl for any late parsed attributes
2871  for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
2872  CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2873 
2874  for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
2875  LateParsedAttrs[i]->addDecl(ThisDecl);
2876  }
2877  Actions.FinalizeDeclaration(ThisDecl);
2878  DeclsInGroup.push_back(ThisDecl);
2879 
2880  if (DeclaratorInfo.isFunctionDeclarator() &&
2881  DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2883  HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2884  }
2885  LateParsedAttrs.clear();
2886 
2887  DeclaratorInfo.complete(ThisDecl);
2888 
2889  // If we don't have a comma, it is either the end of the list (a ';')
2890  // or an error, bail out.
2891  SourceLocation CommaLoc;
2892  if (!TryConsumeToken(tok::comma, CommaLoc))
2893  break;
2894 
2895  if (Tok.isAtStartOfLine() &&
2896  !MightBeDeclarator(DeclaratorContext::MemberContext)) {
2897  // This comma was followed by a line-break and something which can't be
2898  // the start of a declarator. The comma was probably a typo for a
2899  // semicolon.
2900  Diag(CommaLoc, diag::err_expected_semi_declaration)
2901  << FixItHint::CreateReplacement(CommaLoc, ";");
2902  ExpectSemi = false;
2903  break;
2904  }
2905 
2906  // Parse the next declarator.
2907  DeclaratorInfo.clear();
2908  VS.clear();
2909  BitfieldSize = ExprResult(/*Invalid=*/false);
2910  EqualLoc = PureSpecLoc = SourceLocation();
2911  DeclaratorInfo.setCommaLoc(CommaLoc);
2912 
2913  // GNU attributes are allowed before the second and subsequent declarator.
2914  MaybeParseGNUAttributes(DeclaratorInfo);
2915 
2916  if (ParseCXXMemberDeclaratorBeforeInitializer(
2917  DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs))
2918  break;
2919  }
2920 
2921  if (ExpectSemi &&
2922  ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2923  // Skip to end of block or statement.
2924  SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2925  // If we stopped at a ';', eat it.
2926  TryConsumeToken(tok::semi);
2927  return nullptr;
2928  }
2929 
2930  return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2931 }
2932 
2933 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer.
2934 /// Also detect and reject any attempted defaulted/deleted function definition.
2935 /// The location of the '=', if any, will be placed in EqualLoc.
2936 ///
2937 /// This does not check for a pure-specifier; that's handled elsewhere.
2938 ///
2939 /// brace-or-equal-initializer:
2940 /// '=' initializer-expression
2941 /// braced-init-list
2942 ///
2943 /// initializer-clause:
2944 /// assignment-expression
2945 /// braced-init-list
2946 ///
2947 /// defaulted/deleted function-definition:
2948 /// '=' 'default'
2949 /// '=' 'delete'
2950 ///
2951 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2952 /// be a constant-expression.
2953 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2954  SourceLocation &EqualLoc) {
2955  assert(Tok.isOneOf(tok::equal, tok::l_brace)
2956  && "Data member initializer not starting with '=' or '{'");
2957 
2960  if (TryConsumeToken(tok::equal, EqualLoc)) {
2961  if (Tok.is(tok::kw_delete)) {
2962  // In principle, an initializer of '= delete p;' is legal, but it will
2963  // never type-check. It's better to diagnose it as an ill-formed expression
2964  // than as an ill-formed deleted non-function member.
2965  // An initializer of '= delete p, foo' will never be parsed, because
2966  // a top-level comma always ends the initializer expression.
2967  const Token &Next = NextToken();
2968  if (IsFunction || Next.isOneOf(tok::semi, tok::comma, tok::eof)) {
2969  if (IsFunction)
2970  Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2971  << 1 /* delete */;
2972  else
2973  Diag(ConsumeToken(), diag::err_deleted_non_function);
2974  return ExprError();
2975  }
2976  } else if (Tok.is(tok::kw_default)) {
2977  if (IsFunction)
2978  Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2979  << 0 /* default */;
2980  else
2981  Diag(ConsumeToken(), diag::err_default_special_members);
2982  return ExprError();
2983  }
2984  }
2985  if (const auto *PD = dyn_cast_or_null<MSPropertyDecl>(D)) {
2986  Diag(Tok, diag::err_ms_property_initializer) << PD;
2987  return ExprError();
2988  }
2989  return ParseInitializer();
2990 }
2991 
2992 void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc,
2993  SourceLocation AttrFixitLoc,
2994  unsigned TagType, Decl *TagDecl) {
2995  // Skip the optional 'final' keyword.
2996  if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2997  assert(isCXX11FinalKeyword() && "not a class definition");
2998  ConsumeToken();
2999 
3000  // Diagnose any C++11 attributes after 'final' keyword.
3001  // We deliberately discard these attributes.
3002  ParsedAttributesWithRange Attrs(AttrFactory);
3003  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
3004 
3005  // This can only happen if we had malformed misplaced attributes;
3006  // we only get called if there is a colon or left-brace after the
3007  // attributes.
3008  if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace))
3009  return;
3010  }
3011 
3012  // Skip the base clauses. This requires actually parsing them, because
3013  // otherwise we can't be sure where they end (a left brace may appear
3014  // within a template argument).
3015  if (Tok.is(tok::colon)) {
3016  // Enter the scope of the class so that we can correctly parse its bases.
3017  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
3018  ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true,
3019  TagType == DeclSpec::TST_interface);
3020  auto OldContext =
3021  Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl);
3022 
3023  // Parse the bases but don't attach them to the class.
3024  ParseBaseClause(nullptr);
3025 
3026  Actions.ActOnTagFinishSkippedDefinition(OldContext);
3027 
3028  if (!Tok.is(tok::l_brace)) {
3029  Diag(PP.getLocForEndOfToken(PrevTokLocation),
3030  diag::err_expected_lbrace_after_base_specifiers);
3031  return;
3032  }
3033  }
3034 
3035  // Skip the body.
3036  assert(Tok.is(tok::l_brace));
3037  BalancedDelimiterTracker T(*this, tok::l_brace);
3038  T.consumeOpen();
3039  T.skipToEnd();
3040 
3041  // Parse and discard any trailing attributes.
3042  ParsedAttributes Attrs(AttrFactory);
3043  if (Tok.is(tok::kw___attribute))
3044  MaybeParseGNUAttributes(Attrs);
3045 }
3046 
3047 Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas(
3048  AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs,
3049  DeclSpec::TST TagType, Decl *TagDecl) {
3050  ParenBraceBracketBalancer BalancerRAIIObj(*this);
3051 
3052  switch (Tok.getKind()) {
3053  case tok::kw___if_exists:
3054  case tok::kw___if_not_exists:
3055  ParseMicrosoftIfExistsClassDeclaration(TagType, AccessAttrs, AS);
3056  return nullptr;
3057 
3058  case tok::semi:
3059  // Check for extraneous top-level semicolon.
3060  ConsumeExtraSemi(InsideStruct, TagType);
3061  return nullptr;
3062 
3063  // Handle pragmas that can appear as member declarations.
3064  case tok::annot_pragma_vis:
3065  HandlePragmaVisibility();
3066  return nullptr;
3067  case tok::annot_pragma_pack:
3068  HandlePragmaPack();
3069  return nullptr;
3070  case tok::annot_pragma_align:
3071  HandlePragmaAlign();
3072  return nullptr;
3073  case tok::annot_pragma_ms_pointers_to_members:
3074  HandlePragmaMSPointersToMembers();
3075  return nullptr;
3076  case tok::annot_pragma_ms_pragma:
3077  HandlePragmaMSPragma();
3078  return nullptr;
3079  case tok::annot_pragma_ms_vtordisp:
3080  HandlePragmaMSVtorDisp();
3081  return nullptr;
3082  case tok::annot_pragma_dump:
3083  HandlePragmaDump();
3084  return nullptr;
3085 
3086  case tok::kw_namespace:
3087  // If we see a namespace here, a close brace was missing somewhere.
3088  DiagnoseUnexpectedNamespace(cast<NamedDecl>(TagDecl));
3089  return nullptr;
3090 
3091  case tok::kw_private:
3092  // FIXME: We don't accept GNU attributes on access specifiers in OpenCL mode
3093  // yet.
3094  if (getLangOpts().OpenCL && !NextToken().is(tok::colon))
3095  return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
3096  LLVM_FALLTHROUGH;
3097  case tok::kw_public:
3098  case tok::kw_protected: {
3099  AccessSpecifier NewAS = getAccessSpecifierIfPresent();
3100  assert(NewAS != AS_none);
3101  // Current token is a C++ access specifier.
3102  AS = NewAS;
3103  SourceLocation ASLoc = Tok.getLocation();
3104  unsigned TokLength = Tok.getLength();
3105  ConsumeToken();
3106  AccessAttrs.clear();
3107  MaybeParseGNUAttributes(AccessAttrs);
3108 
3109  SourceLocation EndLoc;
3110  if (TryConsumeToken(tok::colon, EndLoc)) {
3111  } else if (TryConsumeToken(tok::semi, EndLoc)) {
3112  Diag(EndLoc, diag::err_expected)
3113  << tok::colon << FixItHint::CreateReplacement(EndLoc, ":");
3114  } else {
3115  EndLoc = ASLoc.getLocWithOffset(TokLength);
3116  Diag(EndLoc, diag::err_expected)
3117  << tok::colon << FixItHint::CreateInsertion(EndLoc, ":");
3118  }
3119 
3120  // The Microsoft extension __interface does not permit non-public
3121  // access specifiers.
3122  if (TagType == DeclSpec::TST_interface && AS != AS_public) {
3123  Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected);
3124  }
3125 
3126  if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc, AccessAttrs)) {
3127  // found another attribute than only annotations
3128  AccessAttrs.clear();
3129  }
3130 
3131  return nullptr;
3132  }
3133 
3134  case tok::annot_pragma_openmp:
3135  return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, AccessAttrs, TagType,
3136  TagDecl);
3137 
3138  default:
3139  if (tok::isPragmaAnnotation(Tok.getKind())) {
3140  Diag(Tok.getLocation(), diag::err_pragma_misplaced_in_decl)
3141  << DeclSpec::getSpecifierName(TagType,
3142  Actions.getASTContext().getPrintingPolicy());
3143  ConsumeAnnotationToken();
3144  return nullptr;
3145  }
3146  return ParseCXXClassMemberDeclaration(AS, AccessAttrs);
3147  }
3148 }
3149 
3150 /// ParseCXXMemberSpecification - Parse the class definition.
3151 ///
3152 /// member-specification:
3153 /// member-declaration member-specification[opt]
3154 /// access-specifier ':' member-specification[opt]
3155 ///
3156 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
3157  SourceLocation AttrFixitLoc,
3158  ParsedAttributesWithRange &Attrs,
3159  unsigned TagType, Decl *TagDecl) {
3160  assert((TagType == DeclSpec::TST_struct ||
3161  TagType == DeclSpec::TST_interface ||
3162  TagType == DeclSpec::TST_union ||
3163  TagType == DeclSpec::TST_class) && "Invalid TagType!");
3164 
3165  llvm::TimeTraceScope TimeScope("ParseClass", [&]() {
3166  if (auto *TD = dyn_cast_or_null<NamedDecl>(TagDecl))
3167  return TD->getQualifiedNameAsString();
3168  return std::string("<anonymous>");
3169  });
3170 
3171  PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
3172  "parsing struct/union/class body");
3173 
3174  // Determine whether this is a non-nested class. Note that local
3175  // classes are *not* considered to be nested classes.
3176  bool NonNestedClass = true;
3177  if (!ClassStack.empty()) {
3178  for (const Scope *S = getCurScope(); S; S = S->getParent()) {
3179  if (S->isClassScope()) {
3180  // We're inside a class scope, so this is a nested class.
3181  NonNestedClass = false;
3182 
3183  // The Microsoft extension __interface does not permit nested classes.
3184  if (getCurrentClass().IsInterface) {
3185  Diag(RecordLoc, diag::err_invalid_member_in_interface)
3186  << /*ErrorType=*/6
3187  << (isa<NamedDecl>(TagDecl)
3188  ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
3189  : "(anonymous)");
3190  }
3191  break;
3192  }
3193 
3194  if ((S->getFlags() & Scope::FnScope))
3195  // If we're in a function or function template then this is a local
3196  // class rather than a nested class.
3197  break;
3198  }
3199  }
3200 
3201  // Enter a scope for the class.
3202  ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
3203 
3204  // Note that we are parsing a new (potentially-nested) class definition.
3205  ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
3206  TagType == DeclSpec::TST_interface);
3207 
3208  if (TagDecl)
3209  Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
3210 
3211  SourceLocation FinalLoc;
3212  bool IsFinalSpelledSealed = false;
3213 
3214  // Parse the optional 'final' keyword.
3215  if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
3216  VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok);
3217  assert((Specifier == VirtSpecifiers::VS_Final ||
3218  Specifier == VirtSpecifiers::VS_GNU_Final ||
3219  Specifier == VirtSpecifiers::VS_Sealed) &&
3220  "not a class definition");
3221  FinalLoc = ConsumeToken();
3222  IsFinalSpelledSealed = Specifier == VirtSpecifiers::VS_Sealed;
3223 
3224  if (TagType == DeclSpec::TST_interface)
3225  Diag(FinalLoc, diag::err_override_control_interface)
3226  << VirtSpecifiers::getSpecifierName(Specifier);
3227  else if (Specifier == VirtSpecifiers::VS_Final)
3228  Diag(FinalLoc, getLangOpts().CPlusPlus11
3229  ? diag::warn_cxx98_compat_override_control_keyword
3230  : diag::ext_override_control_keyword)
3231  << VirtSpecifiers::getSpecifierName(Specifier);
3232  else if (Specifier == VirtSpecifiers::VS_Sealed)
3233  Diag(FinalLoc, diag::ext_ms_sealed_keyword);
3234  else if (Specifier == VirtSpecifiers::VS_GNU_Final)
3235  Diag(FinalLoc, diag::ext_warn_gnu_final);
3236 
3237  // Parse any C++11 attributes after 'final' keyword.
3238  // These attributes are not allowed to appear here,
3239  // and the only possible place for them to appertain
3240  // to the class would be between class-key and class-name.
3241  CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
3242 
3243  // ParseClassSpecifier() does only a superficial check for attributes before
3244  // deciding to call this method. For example, for
3245  // `class C final alignas ([l) {` it will decide that this looks like a
3246  // misplaced attribute since it sees `alignas '(' ')'`. But the actual
3247  // attribute parsing code will try to parse the '[' as a constexpr lambda
3248  // and consume enough tokens that the alignas parsing code will eat the
3249  // opening '{'. So bail out if the next token isn't one we expect.
3250  if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) {
3251  if (TagDecl)
3252  Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3253  return;
3254  }
3255  }
3256 
3257  if (Tok.is(tok::colon)) {
3258  ParseScope InheritanceScope(this, getCurScope()->getFlags() |
3260 
3261  ParseBaseClause(TagDecl);
3262  if (!Tok.is(tok::l_brace)) {
3263  bool SuggestFixIt = false;
3264  SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation);
3265  if (Tok.isAtStartOfLine()) {
3266  switch (Tok.getKind()) {
3267  case tok::kw_private:
3268  case tok::kw_protected:
3269  case tok::kw_public:
3270  SuggestFixIt = NextToken().getKind() == tok::colon;
3271  break;
3272  case tok::kw_static_assert:
3273  case tok::r_brace:
3274  case tok::kw_using:
3275  // base-clause can have simple-template-id; 'template' can't be there
3276  case tok::kw_template:
3277  SuggestFixIt = true;
3278  break;
3279  case tok::identifier:
3280  SuggestFixIt = isConstructorDeclarator(true);
3281  break;
3282  default:
3283  SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false);
3284  break;
3285  }
3286  }
3287  DiagnosticBuilder LBraceDiag =
3288  Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers);
3289  if (SuggestFixIt) {
3290  LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {");
3291  // Try recovering from missing { after base-clause.
3292  PP.EnterToken(Tok, /*IsReinject*/true);
3293  Tok.setKind(tok::l_brace);
3294  } else {
3295  if (TagDecl)
3296  Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3297  return;
3298  }
3299  }
3300  }
3301 
3302  assert(Tok.is(tok::l_brace));
3303  BalancedDelimiterTracker T(*this, tok::l_brace);
3304  T.consumeOpen();
3305 
3306  if (TagDecl)
3307  Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
3308  IsFinalSpelledSealed,
3309  T.getOpenLocation());
3310 
3311  // C++ 11p3: Members of a class defined with the keyword class are private
3312  // by default. Members of a class defined with the keywords struct or union
3313  // are public by default.
3314  AccessSpecifier CurAS;
3315  if (TagType == DeclSpec::TST_class)
3316  CurAS = AS_private;
3317  else
3318  CurAS = AS_public;
3319  ParsedAttributesWithRange AccessAttrs(AttrFactory);
3320 
3321  if (TagDecl) {
3322  // While we still have something to read, read the member-declarations.
3323  while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
3324  Tok.isNot(tok::eof)) {
3325  // Each iteration of this loop reads one member-declaration.
3326  ParseCXXClassMemberDeclarationWithPragmas(
3327  CurAS, AccessAttrs, static_cast<DeclSpec::TST>(TagType), TagDecl);
3328  }
3329  T.consumeClose();
3330  } else {
3331  SkipUntil(tok::r_brace);
3332  }
3333 
3334  // If attributes exist after class contents, parse them.
3335  ParsedAttributes attrs(AttrFactory);
3336  MaybeParseGNUAttributes(attrs);
3337 
3338  if (TagDecl)
3339  Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
3340  T.getOpenLocation(),
3341  T.getCloseLocation(), attrs);
3342 
3343  // C++11 [class.mem]p2:
3344  // Within the class member-specification, the class is regarded as complete
3345  // within function bodies, default arguments, exception-specifications, and
3346  // brace-or-equal-initializers for non-static data members (including such
3347  // things in nested classes).
3348  if (TagDecl && NonNestedClass) {
3349  // We are not inside a nested class. This class and its nested classes
3350  // are complete and we can parse the delayed portions of method
3351  // declarations and the lexed inline method definitions, along with any
3352  // delayed attributes.
3353  SourceLocation SavedPrevTokLocation = PrevTokLocation;
3354  ParseLexedAttributes(getCurrentClass());
3355  ParseLexedMethodDeclarations(getCurrentClass());
3356 
3357  // We've finished with all pending member declarations.
3358  Actions.ActOnFinishCXXMemberDecls();
3359 
3360  ParseLexedMemberInitializers(getCurrentClass());
3361  ParseLexedMethodDefs(getCurrentClass());
3362  PrevTokLocation = SavedPrevTokLocation;
3363 
3364  // We've finished parsing everything, including default argument
3365  // initializers.
3366  Actions.ActOnFinishCXXNonNestedClass(TagDecl);
3367  }
3368 
3369  if (TagDecl)
3370  Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());
3371 
3372  // Leave the class scope.
3373  ParsingDef.Pop();
3374  ClassScope.Exit();
3375 }
3376 
3377 void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) {
3378  assert(Tok.is(tok::kw_namespace));
3379 
3380  // FIXME: Suggest where the close brace should have gone by looking
3381  // at indentation changes within the definition body.
3382  Diag(D->getLocation(),
3383  diag::err_missing_end_of_definition) << D;
3384  Diag(Tok.getLocation(),
3385  diag::note_missing_end_of_definition_before) << D;
3386 
3387  // Push '};' onto the token stream to recover.
3388  PP.EnterToken(Tok, /*IsReinject*/ true);
3389 
3390  Tok.startToken();
3391  Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation));
3392  Tok.setKind(tok::semi);
3393  PP.EnterToken(Tok, /*IsReinject*/ true);
3394 
3395  Tok.setKind(tok::r_brace);
3396 }
3397 
3398 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
3399 /// which explicitly initializes the members or base classes of a
3400 /// class (C++ [class.base.init]). For example, the three initializers
3401 /// after the ':' in the Derived constructor below:
3402 ///
3403 /// @code
3404 /// class Base { };
3405 /// class Derived : Base {
3406 /// int x;
3407 /// float f;
3408 /// public:
3409 /// Derived(float f) : Base(), x(17), f(f) { }
3410 /// };
3411 /// @endcode
3412 ///
3413 /// [C++] ctor-initializer:
3414 /// ':' mem-initializer-list
3415 ///
3416 /// [C++] mem-initializer-list:
3417 /// mem-initializer ...[opt]
3418 /// mem-initializer ...[opt] , mem-initializer-list
3419 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
3420  assert(Tok.is(tok::colon) &&
3421  "Constructor initializer always starts with ':'");
3422 
3423  // Poison the SEH identifiers so they are flagged as illegal in constructor
3424  // initializers.
3425  PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
3427 
3428  SmallVector<CXXCtorInitializer*, 4> MemInitializers;
3429  bool AnyErrors = false;
3430 
3431  do {
3432  if (Tok.is(tok::code_completion)) {
3433  Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
3434  MemInitializers);
3435  return cutOffParsing();
3436  }
3437 
3438  MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
3439  if (!MemInit.isInvalid())
3440  MemInitializers.push_back(MemInit.get());
3441  else
3442  AnyErrors = true;
3443 
3444  if (Tok.is(tok::comma))
3445  ConsumeToken();
3446  else if (Tok.is(tok::l_brace))
3447  break;
3448  // If the previous initializer was valid and the next token looks like a
3449  // base or member initializer, assume that we're just missing a comma.
3450  else if (!MemInit.isInvalid() &&
3451  Tok.isOneOf(tok::identifier, tok::coloncolon)) {
3452  SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
3453  Diag(Loc, diag::err_ctor_init_missing_comma)
3454  << FixItHint::CreateInsertion(Loc, ", ");
3455  } else {
3456  // Skip over garbage, until we get to '{'. Don't eat the '{'.
3457  if (!MemInit.isInvalid())
3458  Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace
3459  << tok::comma;
3460  SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
3461  break;
3462  }
3463  } while (true);
3464 
3465  Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
3466  AnyErrors);
3467 }
3468 
3469 /// ParseMemInitializer - Parse a C++ member initializer, which is
3470 /// part of a constructor initializer that explicitly initializes one
3471 /// member or base class (C++ [class.base.init]). See
3472 /// ParseConstructorInitializer for an example.
3473 ///
3474 /// [C++] mem-initializer:
3475 /// mem-initializer-id '(' expression-list[opt] ')'
3476 /// [C++0x] mem-initializer-id braced-init-list
3477 ///
3478 /// [C++] mem-initializer-id:
3479 /// '::'[opt] nested-name-specifier[opt] class-name
3480 /// identifier
3481 MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
3482  // parse '::'[opt] nested-name-specifier[opt]
3483  CXXScopeSpec SS;
3484  if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false))
3485  return true;
3486 
3487  // : identifier
3488  IdentifierInfo *II = nullptr;
3489  SourceLocation IdLoc = Tok.getLocation();
3490  // : declype(...)
3491  DeclSpec DS(AttrFactory);
3492  // : template_name<...>
3493  ParsedType TemplateTypeTy;
3494 
3495  if (Tok.is(tok::identifier)) {
3496  // Get the identifier. This may be a member name or a class name,
3497  // but we'll let the semantic analysis determine which it is.
3498  II = Tok.getIdentifierInfo();
3499  ConsumeToken();
3500  } else if (Tok.is(tok::annot_decltype)) {
3501  // Get the decltype expression, if there is one.
3502  // Uses of decltype will already have been converted to annot_decltype by
3503  // ParseOptionalCXXScopeSpecifier at this point.
3504  // FIXME: Can we get here with a scope specifier?
3505  ParseDecltypeSpecifier(DS);
3506  } else {
3507  TemplateIdAnnotation *TemplateId = Tok.is(tok::annot_template_id)
3508  ? takeTemplateIdAnnotation(Tok)
3509  : nullptr;
3510  if (TemplateId && (TemplateId->Kind == TNK_Type_template ||
3511  TemplateId->Kind == TNK_Dependent_template_name ||
3512  TemplateId->Kind == TNK_Undeclared_template)) {
3513  AnnotateTemplateIdTokenAsType(/*IsClassName*/true);
3514  assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
3515  TemplateTypeTy = getTypeAnnotation(Tok);
3516  ConsumeAnnotationToken();
3517  if (!TemplateTypeTy)
3518  return true;
3519  } else {
3520  Diag(Tok, diag::err_expected_member_or_base_name);
3521  return true;
3522  }
3523  }
3524 
3525  // Parse the '('.
3526  if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
3527  Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
3528 
3529  // FIXME: Add support for signature help inside initializer lists.
3530  ExprResult InitList = ParseBraceInitializer();
3531  if (InitList.isInvalid())
3532  return true;
3533 
3534  SourceLocation EllipsisLoc;
3535  TryConsumeToken(tok::ellipsis, EllipsisLoc);
3536 
3537  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3538  TemplateTypeTy, DS, IdLoc,
3539  InitList.get(), EllipsisLoc);
3540  } else if(Tok.is(tok::l_paren)) {
3541  BalancedDelimiterTracker T(*this, tok::l_paren);
3542  T.consumeOpen();
3543 
3544  // Parse the optional expression-list.
3545  ExprVector ArgExprs;
3546  CommaLocsTy CommaLocs;
3547  auto RunSignatureHelp = [&] {
3548  QualType PreferredType = Actions.ProduceCtorInitMemberSignatureHelp(
3549  getCurScope(), ConstructorDecl, SS, TemplateTypeTy, ArgExprs, II,
3550  T.getOpenLocation());
3551  CalledSignatureHelp = true;
3552  return PreferredType;
3553  };
3554  if (Tok.isNot(tok::r_paren) &&
3555  ParseExpressionList(ArgExprs, CommaLocs, [&] {
3556  PreferredType.enterFunctionArgument(Tok.getLocation(),
3557  RunSignatureHelp);
3558  })) {
3559  if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
3560  RunSignatureHelp();
3561  SkipUntil(tok::r_paren, StopAtSemi);
3562  return true;
3563  }
3564 
3565  T.consumeClose();
3566 
3567  SourceLocation EllipsisLoc;
3568  TryConsumeToken(tok::ellipsis, EllipsisLoc);
3569 
3570  return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3571  TemplateTypeTy, DS, IdLoc,
3572  T.getOpenLocation(), ArgExprs,
3573  T.getCloseLocation(), EllipsisLoc);
3574  }
3575 
3576  if (getLangOpts().CPlusPlus11)
3577  return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace;
3578  else
3579  return Diag(Tok, diag::err_expected) << tok::l_paren;
3580 }
3581 
3582 /// Parse a C++ exception-specification if present (C++0x [except.spec]).
3583 ///
3584 /// exception-specification:
3585 /// dynamic-exception-specification
3586 /// noexcept-specification
3587 ///
3588 /// noexcept-specification:
3589 /// 'noexcept'
3590 /// 'noexcept' '(' constant-expression ')'
3592 Parser::tryParseExceptionSpecification(bool Delayed,
3593  SourceRange &SpecificationRange,
3594  SmallVectorImpl<ParsedType> &DynamicExceptions,
3595  SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
3596  ExprResult &NoexceptExpr,
3597  CachedTokens *&ExceptionSpecTokens) {
3599  ExceptionSpecTokens = nullptr;
3600 
3601  // Handle delayed parsing of exception-specifications.
3602  if (Delayed) {
3603  if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
3604  return EST_None;
3605 
3606  // Consume and cache the starting token.
3607  bool IsNoexcept = Tok.is(tok::kw_noexcept);
3608  Token StartTok = Tok;
3609  SpecificationRange = SourceRange(ConsumeToken());
3610 
3611  // Check for a '('.
3612  if (!Tok.is(tok::l_paren)) {
3613  // If this is a bare 'noexcept', we're done.
3614  if (IsNoexcept) {
3615  Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3616  NoexceptExpr = nullptr;
3617  return EST_BasicNoexcept;
3618  }
3619 
3620  Diag(Tok, diag::err_expected_lparen_after) << "throw";
3621  return EST_DynamicNone;
3622  }
3623 
3624  // Cache the tokens for the exception-specification.
3625  ExceptionSpecTokens = new CachedTokens;
3626  ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
3627  ExceptionSpecTokens->push_back(Tok); // '('
3628  SpecificationRange.setEnd(ConsumeParen()); // '('
3629 
3630  ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
3631  /*StopAtSemi=*/true,
3632  /*ConsumeFinalToken=*/true);
3633  SpecificationRange.setEnd(ExceptionSpecTokens->back().getLocation());
3634 
3635  return EST_Unparsed;
3636  }
3637 
3638  // See if there's a dynamic specification.
3639  if (Tok.is(tok::kw_throw)) {
3640  Result = ParseDynamicExceptionSpecification(SpecificationRange,
3641  DynamicExceptions,
3642  DynamicExceptionRanges);
3643  assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
3644  "Produced different number of exception types and ranges.");
3645  }
3646 
3647  // If there's no noexcept specification, we're done.
3648  if (Tok.isNot(tok::kw_noexcept))
3649  return Result;
3650 
3651  Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3652 
3653  // If we already had a dynamic specification, parse the noexcept for,
3654  // recovery, but emit a diagnostic and don't store the results.
3655  SourceRange NoexceptRange;
3656  ExceptionSpecificationType NoexceptType = EST_None;
3657 
3658  SourceLocation KeywordLoc = ConsumeToken();
3659  if (Tok.is(tok::l_paren)) {
3660  // There is an argument.
3661  BalancedDelimiterTracker T(*this, tok::l_paren);
3662  T.consumeOpen();
3663  NoexceptExpr = ParseConstantExpression();
3664  T.consumeClose();
3665  if (!NoexceptExpr.isInvalid()) {
3666  NoexceptExpr = Actions.ActOnNoexceptSpec(KeywordLoc, NoexceptExpr.get(),
3667  NoexceptType);
3668  NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
3669  } else {
3670  NoexceptType = EST_BasicNoexcept;
3671  }
3672  } else {
3673  // There is no argument.
3674  NoexceptType = EST_BasicNoexcept;
3675  NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
3676  }
3677 
3678  if (Result == EST_None) {
3679  SpecificationRange = NoexceptRange;
3680  Result = NoexceptType;
3681 
3682  // If there's a dynamic specification after a noexcept specification,
3683  // parse that and ignore the results.
3684  if (Tok.is(tok::kw_throw)) {
3685  Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3686  ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
3687  DynamicExceptionRanges);
3688  }
3689  } else {
3690  Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3691  }
3692 
3693  return Result;
3694 }
3695 
3697  Parser &P, SourceRange Range, bool IsNoexcept) {
3698  if (P.getLangOpts().CPlusPlus11) {
3699  const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
3700  P.Diag(Range.getBegin(),
3701  P.getLangOpts().CPlusPlus17 && !IsNoexcept
3702  ? diag::ext_dynamic_exception_spec
3703  : diag::warn_exception_spec_deprecated)
3704  << Range;
3705  P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
3706  << Replacement << FixItHint::CreateReplacement(Range, Replacement);
3707  }
3708 }
3709 
3710 /// ParseDynamicExceptionSpecification - Parse a C++
3711 /// dynamic-exception-specification (C++ [except.spec]).
3712 ///
3713 /// dynamic-exception-specification:
3714 /// 'throw' '(' type-id-list [opt] ')'
3715 /// [MS] 'throw' '(' '...' ')'
3716 ///
3717 /// type-id-list:
3718 /// type-id ... [opt]
3719 /// type-id-list ',' type-id ... [opt]
3720 ///
3721 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
3722  SourceRange &SpecificationRange,
3723  SmallVectorImpl<ParsedType> &Exceptions,
3724  SmallVectorImpl<SourceRange> &Ranges) {
3725  assert(Tok.is(tok::kw_throw) && "expected throw");
3726 
3727  SpecificationRange.setBegin(ConsumeToken());
3728  BalancedDelimiterTracker T(*this, tok::l_paren);
3729  if (T.consumeOpen()) {
3730  Diag(Tok, diag::err_expected_lparen_after) << "throw";
3731  SpecificationRange.setEnd(SpecificationRange.getBegin());
3732  return EST_DynamicNone;
3733  }
3734 
3735  // Parse throw(...), a Microsoft extension that means "this function
3736  // can throw anything".
3737  if (Tok.is(tok::ellipsis)) {
3738  SourceLocation EllipsisLoc = ConsumeToken();
3739  if (!getLangOpts().MicrosoftExt)
3740  Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
3741  T.consumeClose();
3742  SpecificationRange.setEnd(T.getCloseLocation());
3743  diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
3744  return EST_MSAny;
3745  }
3746 
3747  // Parse the sequence of type-ids.
3748  SourceRange Range;
3749  while (Tok.isNot(tok::r_paren)) {
3750  TypeResult Res(ParseTypeName(&Range));
3751 
3752  if (Tok.is(tok::ellipsis)) {
3753  // C++0x [temp.variadic]p5:
3754  // - In a dynamic-exception-specification (15.4); the pattern is a
3755  // type-id.
3756  SourceLocation Ellipsis = ConsumeToken();
3757  Range.setEnd(Ellipsis);
3758  if (!Res.isInvalid())
3759  Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
3760  }
3761 
3762  if (!Res.isInvalid()) {
3763  Exceptions.push_back(Res.get());
3764  Ranges.push_back(Range);
3765  }
3766 
3767  if (!TryConsumeToken(tok::comma))
3768  break;
3769  }
3770 
3771  T.consumeClose();
3772  SpecificationRange.setEnd(T.getCloseLocation());
3773  diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
3774  Exceptions.empty());
3775  return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3776 }
3777 
3778 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
3779 /// function declaration.
3780 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range,
3781  bool MayBeFollowedByDirectInit) {
3782  assert(Tok.is(tok::arrow) && "expected arrow");
3783 
3784  ConsumeToken();
3785 
3786  return ParseTypeName(&Range, MayBeFollowedByDirectInit
3789 }
3790 
3791 /// We have just started parsing the definition of a new class,
3792 /// so push that class onto our stack of classes that is currently
3793 /// being parsed.
3795 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
3796  bool IsInterface) {
3797  assert((NonNestedClass || !ClassStack.empty()) &&
3798  "Nested class without outer class");
3799  ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
3800  return Actions.PushParsingClass();
3801 }
3802 
3803 /// Deallocate the given parsed class and all of its nested
3804 /// classes.
3805 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
3806  for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
3807  delete Class->LateParsedDeclarations[I];
3808  delete Class;
3809 }
3810 
3811 /// Pop the top class of the stack of classes that are
3812 /// currently being parsed.
3813 ///
3814 /// This routine should be called when we have finished parsing the
3815 /// definition of a class, but have not yet popped the Scope
3816 /// associated with the class's definition.
3817 void Parser::PopParsingClass(Sema::ParsingClassState state) {
3818  assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
3819 
3820  Actions.PopParsingClass(state);
3821 
3822  ParsingClass *Victim = ClassStack.top();
3823  ClassStack.pop();
3824  if (Victim->TopLevelClass) {
3825  // Deallocate all of the nested classes of this class,
3826  // recursively: we don't need to keep any of this information.
3827  DeallocateParsedClasses(Victim);
3828  return;
3829  }
3830  assert(!ClassStack.empty() && "Missing top-level class?");
3831 
3832  if (Victim->LateParsedDeclarations.empty()) {
3833  // The victim is a nested class, but we will not need to perform
3834  // any processing after the definition of this class since it has
3835  // no members whose handling was delayed. Therefore, we can just
3836  // remove this nested class.
3837  DeallocateParsedClasses(Victim);
3838  return;
3839  }
3840 
3841  // This nested class has some members that will need to be processed
3842  // after the top-level class is completely defined. Therefore, add
3843  // it to the list of nested classes within its parent.
3844  assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
3845  ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
3846  Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
3847 }
3848 
3849 /// Try to parse an 'identifier' which appears within an attribute-token.
3850 ///
3851 /// \return the parsed identifier on success, and 0 if the next token is not an
3852 /// attribute-token.
3853 ///
3854 /// C++11 [dcl.attr.grammar]p3:
3855 /// If a keyword or an alternative token that satisfies the syntactic
3856 /// requirements of an identifier is contained in an attribute-token,
3857 /// it is considered an identifier.
3858 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
3859  switch (Tok.getKind()) {
3860  default:
3861  // Identifiers and keywords have identifier info attached.
3862  if (!Tok.isAnnotation()) {
3863  if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
3864  Loc = ConsumeToken();
3865  return II;
3866  }
3867  }
3868  return nullptr;
3869 
3870  case tok::numeric_constant: {
3871  // If we got a numeric constant, check to see if it comes from a macro that
3872  // corresponds to the predefined __clang__ macro. If it does, warn the user
3873  // and recover by pretending they said _Clang instead.
3874  if (Tok.getLocation().isMacroID()) {
3875  SmallString<8> ExpansionBuf;
3876  SourceLocation ExpansionLoc =
3877  PP.getSourceManager().getExpansionLoc(Tok.getLocation());
3878  StringRef Spelling = PP.getSpelling(ExpansionLoc, ExpansionBuf);
3879  if (Spelling == "__clang__") {
3880  SourceRange TokRange(
3881  ExpansionLoc,
3882  PP.getSourceManager().getExpansionLoc(Tok.getEndLoc()));
3883  Diag(Tok, diag::warn_wrong_clang_attr_namespace)
3884  << FixItHint::CreateReplacement(TokRange, "_Clang");
3885  Loc = ConsumeToken();
3886  return &PP.getIdentifierTable().get("_Clang");
3887  }
3888  }
3889  return nullptr;
3890  }
3891 
3892  case tok::ampamp: // 'and'
3893  case tok::pipe: // 'bitor'
3894  case tok::pipepipe: // 'or'
3895  case tok::caret: // 'xor'
3896  case tok::tilde: // 'compl'
3897  case tok::amp: // 'bitand'
3898  case tok::ampequal: // 'and_eq'
3899  case tok::pipeequal: // 'or_eq'
3900  case tok::caretequal: // 'xor_eq'
3901  case tok::exclaim: // 'not'
3902  case tok::exclaimequal: // 'not_eq'
3903  // Alternative tokens do not have identifier info, but their spelling
3904  // starts with an alphabetical character.
3905  SmallString<8> SpellingBuf;
3906  SourceLocation SpellingLoc =
3907  PP.getSourceManager().getSpellingLoc(Tok.getLocation());
3908  StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf);
3909  if (isLetter(Spelling[0])) {
3910  Loc = ConsumeToken();
3911  return &PP.getIdentifierTable().get(Spelling);
3912  }
3913  return nullptr;
3914  }
3915 }
3916 
3918  IdentifierInfo *ScopeName) {
3919  switch (
3920  ParsedAttr::getParsedKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) {
3921  case ParsedAttr::AT_CarriesDependency:
3922  case ParsedAttr::AT_Deprecated:
3923  case ParsedAttr::AT_FallThrough:
3924  case ParsedAttr::AT_CXX11NoReturn:
3925  case ParsedAttr::AT_NoUniqueAddress:
3926  return true;
3927  case ParsedAttr::AT_WarnUnusedResult:
3928  return !ScopeName && AttrName->getName().equals("nodiscard");
3929  case ParsedAttr::AT_Unused:
3930  return !ScopeName && AttrName->getName().equals("maybe_unused");
3931  default:
3932  return false;
3933  }
3934 }
3935 
3936 /// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause.
3937 ///
3938 /// [C++11] attribute-argument-clause:
3939 /// '(' balanced-token-seq ')'
3940 ///
3941 /// [C++11] balanced-token-seq:
3942 /// balanced-token
3943 /// balanced-token-seq balanced-token
3944 ///
3945 /// [C++11] balanced-token:
3946 /// '(' balanced-token-seq ')'
3947 /// '[' balanced-token-seq ']'
3948 /// '{' balanced-token-seq '}'
3949 /// any token but '(', ')', '[', ']', '{', or '}'
3950 bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName,
3951  SourceLocation AttrNameLoc,
3952  ParsedAttributes &Attrs,
3953  SourceLocation *EndLoc,
3954  IdentifierInfo *ScopeName,
3955  SourceLocation ScopeLoc) {
3956  assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list");
3957  SourceLocation LParenLoc = Tok.getLocation();
3958  const LangOptions &LO = getLangOpts();
3959  ParsedAttr::Syntax Syntax =
3960  LO.CPlusPlus ? ParsedAttr::AS_CXX11 : ParsedAttr::AS_C2x;
3961 
3962  // If the attribute isn't known, we will not attempt to parse any
3963  // arguments.
3964  if (!hasAttribute(LO.CPlusPlus ? AttrSyntax::CXX : AttrSyntax::C, ScopeName,
3965  AttrName, getTargetInfo(), getLangOpts())) {
3966  // Eat the left paren, then skip to the ending right paren.
3967  ConsumeParen();
3968  SkipUntil(tok::r_paren);
3969  return false;
3970  }
3971 
3972  if (ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"))) {
3973  // GNU-scoped attributes have some special cases to handle GNU-specific
3974  // behaviors.
3975  ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
3976  ScopeLoc, Syntax, nullptr);
3977  return true;
3978  }
3979 
3980  unsigned NumArgs;
3981  // Some Clang-scoped attributes have some special parsing behavior.
3982  if (ScopeName && (ScopeName->isStr("clang") || ScopeName->isStr("_Clang")))
3983  NumArgs = ParseClangAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc,
3984  ScopeName, ScopeLoc, Syntax);
3985  else
3986  NumArgs =
3987  ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
3988  ScopeName, ScopeLoc, Syntax);
3989 
3990  if (!Attrs.empty() &&
3991  IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) {
3992  ParsedAttr &Attr = Attrs.back();
3993  // If the attribute is a standard or built-in attribute and we are
3994  // parsing an argument list, we need to determine whether this attribute
3995  // was allowed to have an argument list (such as [[deprecated]]), and how
3996  // many arguments were parsed (so we can diagnose on [[deprecated()]]).
3997  if (Attr.getMaxArgs() && !NumArgs) {
3998  // The attribute was allowed to have arguments, but none were provided
3999  // even though the attribute parsed successfully. This is an error.
4000  Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName;
4001  Attr.setInvalid(true);
4002  } else if (!Attr.getMaxArgs()) {
4003  // The attribute parsed successfully, but was not allowed to have any
4004  // arguments. It doesn't matter whether any were provided -- the
4005  // presence of the argument list (even if empty) is diagnosed.
4006  Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments)
4007  << AttrName
4008  << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc));
4009  Attr.setInvalid(true);
4010  }
4011  }
4012  return true;
4013 }
4014 
4015 /// ParseCXX11AttributeSpecifier - Parse a C++11 or C2x attribute-specifier.
4016 ///
4017 /// [C++11] attribute-specifier:
4018 /// '[' '[' attribute-list ']' ']'
4019 /// alignment-specifier
4020 ///
4021 /// [C++11] attribute-list:
4022 /// attribute[opt]
4023 /// attribute-list ',' attribute[opt]
4024 /// attribute '...'
4025 /// attribute-list ',' attribute '...'
4026 ///
4027 /// [C++11] attribute:
4028 /// attribute-token attribute-argument-clause[opt]
4029 ///
4030 /// [C++11] attribute-token:
4031 /// identifier
4032 /// attribute-scoped-token
4033 ///
4034 /// [C++11] attribute-scoped-token:
4035 /// attribute-namespace '::' identifier
4036 ///
4037 /// [C++11] attribute-namespace:
4038 /// identifier
4039 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
4040  SourceLocation *endLoc) {
4041  if (Tok.is(tok::kw_alignas)) {
4042  Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
4043  ParseAlignmentSpecifier(attrs, endLoc);
4044  return;
4045  }
4046 
4047  assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) &&
4048  "Not a double square bracket attribute list");
4049 
4050  Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
4051 
4052  ConsumeBracket();
4053  ConsumeBracket();
4054 
4055  SourceLocation CommonScopeLoc;
4056  IdentifierInfo *CommonScopeName = nullptr;
4057  if (Tok.is(tok::kw_using)) {
4058  Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
4059  ? diag::warn_cxx14_compat_using_attribute_ns
4060  : diag::ext_using_attribute_ns);
4061  ConsumeToken();
4062 
4063  CommonScopeName = TryParseCXX11AttributeIdentifier(CommonScopeLoc);
4064  if (!CommonScopeName) {
4065  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4066  SkipUntil(tok::r_square, tok::colon, StopBeforeMatch);
4067  }
4068  if (!TryConsumeToken(tok::colon) && CommonScopeName)
4069  Diag(Tok.getLocation(), diag::err_expected) << tok::colon;
4070  }
4071 
4072  llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
4073 
4074  while (Tok.isNot(tok::r_square)) {
4075  // attribute not present
4076  if (TryConsumeToken(tok::comma))
4077  continue;
4078 
4079  SourceLocation ScopeLoc, AttrLoc;
4080  IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr;
4081 
4082  AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
4083  if (!AttrName)
4084  // Break out to the "expected ']'" diagnostic.
4085  break;
4086 
4087  // scoped attribute
4088  if (TryConsumeToken(tok::coloncolon)) {
4089  ScopeName = AttrName;
4090  ScopeLoc = AttrLoc;
4091 
4092  AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
4093  if (!AttrName) {
4094  Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4095  SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch);
4096  continue;
4097  }
4098  }
4099 
4100  if (CommonScopeName) {
4101  if (ScopeName) {
4102  Diag(ScopeLoc, diag::err_using_attribute_ns_conflict)
4103  << SourceRange(CommonScopeLoc);
4104  } else {
4105  ScopeName = CommonScopeName;
4106  ScopeLoc = CommonScopeLoc;
4107  }
4108  }
4109 
4110  bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName);
4111  bool AttrParsed = false;
4112 
4113  if (StandardAttr &&
4114  !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second)
4115  Diag(AttrLoc, diag::err_cxx11_attribute_repeated)
4116  << AttrName << SourceRange(SeenAttrs[AttrName]);
4117 
4118  // Parse attribute arguments
4119  if (Tok.is(tok::l_paren))
4120  AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, attrs, endLoc,
4121  ScopeName, ScopeLoc);
4122 
4123  if (!AttrParsed)
4124  attrs.addNew(
4125  AttrName,
4126  SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, AttrLoc),
4127  ScopeName, ScopeLoc, nullptr, 0,
4129 
4130  if (TryConsumeToken(tok::ellipsis))
4131  Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
4132  << AttrName;
4133  }
4134 
4135  if (ExpectAndConsume(tok::r_square))
4136  SkipUntil(tok::r_square);
4137  if (endLoc)
4138  *endLoc = Tok.getLocation();
4139  if (ExpectAndConsume(tok::r_square))
4140  SkipUntil(tok::r_square);
4141 }
4142 
4143 /// ParseCXX11Attributes - Parse a C++11 or C2x attribute-specifier-seq.
4144 ///
4145 /// attribute-specifier-seq:
4146 /// attribute-specifier-seq[opt] attribute-specifier
4147 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
4148  SourceLocation *endLoc) {
4149  assert(standardAttributesAllowed());
4150 
4151  SourceLocation StartLoc = Tok.getLocation(), Loc;
4152  if (!endLoc)
4153  endLoc = &Loc;
4154 
4155  do {
4156  ParseCXX11AttributeSpecifier(attrs, endLoc);
4157  } while (isCXX11AttributeSpecifier());
4158 
4159  attrs.Range = SourceRange(StartLoc, *endLoc);
4160 }
4161 
4162 void Parser::DiagnoseAndSkipCXX11Attributes() {
4163  // Start and end location of an attribute or an attribute list.
4164  SourceLocation StartLoc = Tok.getLocation();
4165  SourceLocation EndLoc = SkipCXX11Attributes();
4166 
4167  if (EndLoc.isValid()) {
4168  SourceRange Range(StartLoc, EndLoc);
4169  Diag(StartLoc, diag::err_attributes_not_allowed)
4170  << Range;
4171  }
4172 }
4173 
4174 SourceLocation Parser::SkipCXX11Attributes() {
4175  SourceLocation EndLoc;
4176 
4177  if (!isCXX11AttributeSpecifier())
4178  return EndLoc;
4179 
4180  do {
4181  if (Tok.is(tok::l_square)) {
4182  BalancedDelimiterTracker T(*this, tok::l_square);
4183  T.consumeOpen();
4184  T.skipToEnd();
4185  EndLoc = T.getCloseLocation();
4186  } else {
4187  assert(Tok.is(tok::kw_alignas) && "not an attribute specifier");
4188  ConsumeToken();
4189  BalancedDelimiterTracker T(*this, tok::l_paren);
4190  if (!T.consumeOpen())
4191  T.skipToEnd();
4192  EndLoc = T.getCloseLocation();
4193  }
4194  } while (isCXX11AttributeSpecifier());
4195 
4196  return EndLoc;
4197 }
4198 
4199 /// Parse uuid() attribute when it appears in a [] Microsoft attribute.
4200 void Parser::ParseMicrosoftUuidAttributeArgs(ParsedAttributes &Attrs) {
4201  assert(Tok.is(tok::identifier) && "Not a Microsoft attribute list");
4202  IdentifierInfo *UuidIdent = Tok.getIdentifierInfo();
4203  assert(UuidIdent->getName() == "uuid" && "Not a Microsoft attribute list");
4204 
4205  SourceLocation UuidLoc = Tok.getLocation();
4206  ConsumeToken();
4207 
4208  // Ignore the left paren location for now.
4209  BalancedDelimiterTracker T(*this, tok::l_paren);
4210  if (T.consumeOpen()) {
4211  Diag(Tok, diag::err_expected) << tok::l_paren;
4212  return;
4213  }
4214 
4215  ArgsVector ArgExprs;
4216  if (Tok.is(tok::string_literal)) {
4217  // Easy case: uuid("...") -- quoted string.
4218  ExprResult StringResult = ParseStringLiteralExpression();
4219  if (StringResult.isInvalid())
4220  return;
4221  ArgExprs.push_back(StringResult.get());
4222  } else {
4223  // something like uuid({000000A0-0000-0000-C000-000000000049}) -- no
4224  // quotes in the parens. Just append the spelling of all tokens encountered
4225  // until the closing paren.
4226 
4227  SmallString<42> StrBuffer; // 2 "", 36 bytes UUID, 2 optional {}, 1 nul
4228  StrBuffer += "\"";
4229 
4230  // Since none of C++'s keywords match [a-f]+, accepting just tok::l_brace,
4231  // tok::r_brace, tok::minus, tok::identifier (think C000) and
4232  // tok::numeric_constant (0000) should be enough. But the spelling of the
4233  // uuid argument is checked later anyways, so there's no harm in accepting
4234  // almost anything here.
4235  // cl is very strict about whitespace in this form and errors out if any
4236  // is present, so check the space flags on the tokens.
4237  SourceLocation StartLoc = Tok.getLocation();
4238  while (Tok.isNot(tok::r_paren)) {
4239  if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4240  Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4241  SkipUntil(tok::r_paren, StopAtSemi);
4242  return;
4243  }
4244  SmallString<16> SpellingBuffer;
4245  SpellingBuffer.resize(Tok.getLength() + 1);
4246  bool Invalid = false;
4247  StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
4248  if (Invalid) {
4249  SkipUntil(tok::r_paren, StopAtSemi);
4250  return;
4251  }
4252  StrBuffer += TokSpelling;
4253  ConsumeAnyToken();
4254  }
4255  StrBuffer += "\"";
4256 
4257  if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
4258  Diag(Tok, diag::err_attribute_uuid_malformed_guid);
4259  ConsumeParen();
4260  return;
4261  }
4262 
4263  // Pretend the user wrote the appropriate string literal here.
4264  // ActOnStringLiteral() copies the string data into the literal, so it's
4265  // ok that the Token points to StrBuffer.
4266  Token Toks[1];
4267  Toks[0].startToken();
4268  Toks[0].setKind(tok::string_literal);
4269  Toks[0].setLocation(StartLoc);
4270  Toks[0].setLiteralData(StrBuffer.data());
4271  Toks[0].setLength(StrBuffer.size());
4272  StringLiteral *UuidString =
4273  cast<StringLiteral>(Actions.ActOnStringLiteral(Toks, nullptr).get());
4274  ArgExprs.push_back(UuidString);
4275  }
4276 
4277  if (!T.consumeClose()) {
4278  Attrs.addNew(UuidIdent, SourceRange(UuidLoc, T.getCloseLocation()), nullptr,
4279  SourceLocation(), ArgExprs.data(), ArgExprs.size(),
4281  }
4282 }
4283 
4284 /// ParseMicrosoftAttributes - Parse Microsoft attributes [Attr]
4285 ///
4286 /// [MS] ms-attribute:
4287 /// '[' token-seq ']'
4288 ///
4289 /// [MS] ms-attribute-seq:
4290 /// ms-attribute[opt]
4291 /// ms-attribute ms-attribute-seq
4292 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
4293  SourceLocation *endLoc) {
4294  assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
4295 
4296  do {
4297  // FIXME: If this is actually a C++11 attribute, parse it as one.
4298  BalancedDelimiterTracker T(*this, tok::l_square);
4299  T.consumeOpen();
4300 
4301  // Skip most ms attributes except for a whitelist.
4302  while (true) {
4303  SkipUntil(tok::r_square, tok::identifier, StopAtSemi | StopBeforeMatch);
4304  if (Tok.isNot(tok::identifier)) // ']', but also eof
4305  break;
4306  if (Tok.getIdentifierInfo()->getName() == "uuid")
4307  ParseMicrosoftUuidAttributeArgs(attrs);
4308  else
4309  ConsumeToken();
4310  }
4311 
4312  T.consumeClose();
4313  if (endLoc)
4314  *endLoc = T.getCloseLocation();
4315  } while (Tok.is(tok::l_square));
4316 }
4317 
4318 void Parser::ParseMicrosoftIfExistsClassDeclaration(
4319  DeclSpec::TST TagType, ParsedAttributes &AccessAttrs,
4320  AccessSpecifier &CurAS) {
4321  IfExistsCondition Result;
4322  if (ParseMicrosoftIfExistsCondition(Result))
4323  return;
4324 
4325  BalancedDelimiterTracker Braces(*this, tok::l_brace);
4326  if (Braces.consumeOpen()) {
4327  Diag(Tok, diag::err_expected) << tok::l_brace;
4328  return;
4329  }
4330 
4331  switch (Result.Behavior) {
4332  case IEB_Parse:
4333  // Parse the declarations below.
4334  break;
4335 
4336  case IEB_Dependent:
4337  Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
4338  << Result.IsIfExists;
4339  // Fall through to skip.
4340  LLVM_FALLTHROUGH;
4341 
4342  case IEB_Skip:
4343  Braces.skipToEnd();
4344  return;
4345  }
4346 
4347  while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
4348  // __if_exists, __if_not_exists can nest.
4349  if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
4350  ParseMicrosoftIfExistsClassDeclaration(TagType,
4351  AccessAttrs, CurAS);
4352  continue;
4353  }
4354 
4355  // Check for extraneous top-level semicolon.
4356  if (Tok.is(tok::semi)) {
4357  ConsumeExtraSemi(InsideStruct, TagType);
4358  continue;
4359  }
4360 
4361  AccessSpecifier AS = getAccessSpecifierIfPresent();
4362  if (AS != AS_none) {
4363  // Current token is a C++ access specifier.
4364  CurAS = AS;
4365  SourceLocation ASLoc = Tok.getLocation();
4366  ConsumeToken();
4367  if (Tok.is(tok::colon))
4368  Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation(),
4370  else
4371  Diag(Tok, diag::err_expected) << tok::colon;
4372  ConsumeToken();
4373  continue;
4374  }
4375 
4376  // Parse all the comma separated declarators.
4377  ParseCXXClassMemberDeclaration(CurAS, AccessAttrs);
4378  }
4379 
4380  Braces.consumeClose();
4381 }
Defines the clang::ASTContext interface.
DeclaratorChunk::FunctionTypeInfo & getFunctionTypeInfo()
getFunctionTypeInfo - Retrieves the function type info object (looking through parentheses).
Definition: DeclSpec.h:2278
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:643
void clear()
Reset the contents of this Declarator.
Definition: DeclSpec.h:1927
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:481
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
Syntax
The style used to specify an attribute.
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:1436
bool TryAnnotateCXXScopeToken(bool EnteringContext=false)
TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only annotates C++ scope specifiers and ...
Definition: Parser.cpp:1993
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:2247
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:105
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:1244
static const char * getSpecifierName(Specifier VS)
Definition: DeclSpec.cpp:1408
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:113
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:2146
const ParsedAttributes & getAttributes() const
Definition: DeclSpec.h:2419
RAII object that enters a new expression evaluation context.
Definition: Sema.h:11557
static const TST TST_underlyingType
Definition: DeclSpec.h:302
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1775
void setTypeofParensRange(SourceRange range)
Definition: DeclSpec.h:515
TypeSpecifierType
Specifies the kind of type.
Definition: Specifiers.h:60
static const TST TST_interface
Definition: DeclSpec.h:295
bool isInvalidDecl() const
Definition: DeclBase.h:553
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:281
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:1104
Information about a template-id annotation token.
bool isUnset() const
Definition: DeclSpec.h:2525
SourceLocation getFriendSpecLoc() const
Definition: DeclSpec.h:726
Represents a struct/union/class.
Definition: Decl.h:3662
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:260
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:54
bool Zero(InterpState &S, CodePtr OpPC)
Definition: Interp.h:815
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:944
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:12893
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:670
void takeAllFrom(ParsedAttributes &attrs)
Definition: ParsedAttr.h:831
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:8
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
const char * getName() const
Definition: Token.h:168
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:345
SourceLocation LAngleLoc
The location of the &#39;<&#39; before the template argument list.
A little helper class used to produce diagnostics.
Definition: Diagnostic.h:1043
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:2121
void SetRangeStart(SourceLocation Loc)
Definition: DeclSpec.h:629
unsigned NumParams
NumParams - This is the number of formal parameters specified by the declarator.
Definition: DeclSpec.h:1298
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:212
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
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:1922
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:2540
TypeResult ActOnTypeName(Scope *S, Declarator &D)
Definition: SemaType.cpp:5850
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:132
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:2440
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:691
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:1343
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:258
DeclaratorContext
Definition: DeclSpec.h:1733
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:725
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:4310
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:2237
Kind
Stop skipping at semicolon.
Definition: Parser.h:1084
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:1295
bool hasName() const
hasName - Whether this declarator has a name, which might be an identifier (accessible via getIdentif...
Definition: DeclSpec.h:2127
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
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3133
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:117
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:850
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:261
Represents a C++11 virt-specifier-seq.
Definition: DeclSpec.h:2509
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:525
FunctionDefinitionKind
Described the kind of function definition (if any) provided for a function.
Definition: DeclSpec.h:1726
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:2468
SourceLocation getModulePrivateSpecLoc() const
Definition: DeclSpec.h:729
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:1152
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:118
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:1383
unsigned getTypeQualifiers() const
getTypeQualifiers - Return a set of TQs.
Definition: DeclSpec.h:538
void takeAttributesFrom(ParsedAttributes &attrs)
Definition: DeclSpec.h:775
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:1911
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:92
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:1468
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:787
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2143
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
unsigned getMaxArgs() const
Definition: ParsedAttr.cpp:134
void getCXX11AttributeRanges(SmallVectorImpl< SourceRange > &Ranges)
Return a source range list of C++11 attributes associated with the declarator.
Definition: DeclSpec.h:2434
X
Add a minimal nested name specifier fixit hint to allow lookup of a tag name from an outer enclosing ...
Definition: SemaDecl.cpp:14652
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 isPragmaAnnotation(TokenKind K)
Return true if this is an annotation token representing a pragma.
Definition: TokenKinds.cpp:59
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:1864
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:129
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:2538
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1686
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:1918
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:66
void setLocation(SourceLocation L)
Definition: Token.h:134
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:377
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:1033
bool SetTypeSpecError()
Definition: DeclSpec.cpp:890
Expr * getRepAsExpr() const
Definition: DeclSpec.h:490
Represents C++ using-directive.
Definition: DeclCXX.h:2845
unsigned NumArgs
NumArgs - The number of template arguments.
void SetRangeEnd(SourceLocation Loc)
Definition: DeclSpec.h:630
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:824
SourceLocation ColonLoc
Location of &#39;:&#39;.
Definition: OpenMPClause.h:107
void setCommaLoc(SourceLocation CL)
Definition: DeclSpec.h:2462
bool hasLeadingSpace() const
Return true if this token has whitespace before it.
Definition: Token.h:272
No in-class initializer.
Definition: Specifiers.h:259
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:1323
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:45
SourceLocation getLocation() const
Definition: DeclBase.h:429
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:1086
SourceLocation getEndLoc() const
Definition: Token.h:153