1 //===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the C++ Declaration portions of the Parser interfaces.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Parse/Parser.h"
15 #include "RAIIObjectsForParser.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/Basic/Attributes.h"
19 #include "clang/Basic/CharInfo.h"
20 #include "clang/Basic/OperatorKinds.h"
21 #include "clang/Basic/TargetInfo.h"
22 #include "clang/Parse/ParseDiagnostic.h"
23 #include "clang/Sema/DeclSpec.h"
24 #include "clang/Sema/ParsedTemplate.h"
25 #include "clang/Sema/PrettyDeclStackTrace.h"
26 #include "clang/Sema/Scope.h"
27 #include "clang/Sema/SemaDiagnostic.h"
28 #include "llvm/ADT/SmallString.h"
29
30 using namespace clang;
31
32 /// ParseNamespace - We know that the current token is a namespace keyword. This
33 /// may either be a top level namespace or a block-level namespace alias. If
34 /// there was an inline keyword, it has already been parsed.
35 ///
36 /// namespace-definition: [C++ 7.3: basic.namespace]
37 /// named-namespace-definition
38 /// unnamed-namespace-definition
39 ///
40 /// unnamed-namespace-definition:
41 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
42 ///
43 /// named-namespace-definition:
44 /// original-namespace-definition
45 /// extension-namespace-definition
46 ///
47 /// original-namespace-definition:
48 /// 'inline'[opt] 'namespace' identifier attributes[opt]
49 /// '{' namespace-body '}'
50 ///
51 /// extension-namespace-definition:
52 /// 'inline'[opt] 'namespace' original-namespace-name
53 /// '{' namespace-body '}'
54 ///
55 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
56 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
57 ///
ParseNamespace(unsigned Context,SourceLocation & DeclEnd,SourceLocation InlineLoc)58 Parser::DeclGroupPtrTy Parser::ParseNamespace(unsigned 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)) {
66 Actions.CodeCompleteNamespaceDecl(getCurScope());
67 cutOffParsing();
68 return DeclGroupPtrTy();;
69 }
70
71 SourceLocation IdentLoc;
72 IdentifierInfo *Ident = nullptr;
73 std::vector<SourceLocation> ExtraIdentLoc;
74 std::vector<IdentifierInfo*> ExtraIdent;
75 std::vector<SourceLocation> ExtraNamespaceLoc;
76
77 ParsedAttributesWithRange attrs(AttrFactory);
78 SourceLocation attrLoc;
79 if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) {
80 if (!getLangOpts().CPlusPlus1z)
81 Diag(Tok.getLocation(), diag::warn_cxx14_compat_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) && NextToken().is(tok::identifier)) {
91 ExtraNamespaceLoc.push_back(ConsumeToken());
92 ExtraIdent.push_back(Tok.getIdentifierInfo());
93 ExtraIdentLoc.push_back(ConsumeToken());
94 }
95 }
96
97 // A nested namespace definition cannot have attributes.
98 if (!ExtraNamespaceLoc.empty() && attrLoc.isValid())
99 Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute);
100
101 // Read label attributes, if present.
102 if (Tok.is(tok::kw___attribute)) {
103 attrLoc = Tok.getLocation();
104 ParseGNUAttributes(attrs);
105 }
106
107 if (Tok.is(tok::equal)) {
108 if (!Ident) {
109 Diag(Tok, diag::err_expected) << tok::identifier;
110 // Skip to end of the definition and eat the ';'.
111 SkipUntil(tok::semi);
112 return DeclGroupPtrTy();
113 }
114 if (attrLoc.isValid())
115 Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias);
116 if (InlineLoc.isValid())
117 Diag(InlineLoc, diag::err_inline_namespace_alias)
118 << FixItHint::CreateRemoval(InlineLoc);
119 Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
120 return Actions.ConvertDeclToDeclGroup(NSAlias);
121 }
122
123 BalancedDelimiterTracker T(*this, tok::l_brace);
124 if (T.consumeOpen()) {
125 if (Ident)
126 Diag(Tok, diag::err_expected) << tok::l_brace;
127 else
128 Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
129 return DeclGroupPtrTy();
130 }
131
132 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
133 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
134 getCurScope()->getFnParent()) {
135 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
136 SkipUntil(tok::r_brace);
137 return DeclGroupPtrTy();
138 }
139
140 if (ExtraIdent.empty()) {
141 // Normal namespace definition, not a nested-namespace-definition.
142 } else if (InlineLoc.isValid()) {
143 Diag(InlineLoc, diag::err_inline_nested_namespace_definition);
144 } else if (getLangOpts().CPlusPlus1z) {
145 Diag(ExtraNamespaceLoc[0],
146 diag::warn_cxx14_compat_nested_namespace_definition);
147 } else {
148 TentativeParsingAction TPA(*this);
149 SkipUntil(tok::r_brace, StopBeforeMatch);
150 Token rBraceToken = Tok;
151 TPA.Revert();
152
153 if (!rBraceToken.is(tok::r_brace)) {
154 Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
155 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
156 } else {
157 std::string NamespaceFix;
158 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
159 E = ExtraIdent.end(); I != E; ++I) {
160 NamespaceFix += " { namespace ";
161 NamespaceFix += (*I)->getName();
162 }
163
164 std::string RBraces;
165 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
166 RBraces += "} ";
167
168 Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
169 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
170 ExtraIdentLoc.back()),
171 NamespaceFix)
172 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
173 }
174 }
175
176 // If we're still good, complain about inline namespaces in non-C++0x now.
177 if (InlineLoc.isValid())
178 Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
179 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
180
181 // Enter a scope for the namespace.
182 ParseScope NamespaceScope(this, Scope::DeclScope);
183
184 UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
185 Decl *NamespcDecl =
186 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
187 IdentLoc, Ident, T.getOpenLocation(),
188 attrs.getList(), ImplicitUsingDirectiveDecl);
189
190 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
191 "parsing namespace");
192
193 // Parse the contents of the namespace. This includes parsing recovery on
194 // any improperly nested namespaces.
195 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
196 InlineLoc, attrs, T);
197
198 // Leave the namespace scope.
199 NamespaceScope.Exit();
200
201 DeclEnd = T.getCloseLocation();
202 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
203
204 return Actions.ConvertDeclToDeclGroup(NamespcDecl,
205 ImplicitUsingDirectiveDecl);
206 }
207
208 /// ParseInnerNamespace - Parse the contents of a namespace.
ParseInnerNamespace(std::vector<SourceLocation> & IdentLoc,std::vector<IdentifierInfo * > & Ident,std::vector<SourceLocation> & NamespaceLoc,unsigned int index,SourceLocation & InlineLoc,ParsedAttributes & attrs,BalancedDelimiterTracker & Tracker)209 void Parser::ParseInnerNamespace(std::vector<SourceLocation> &IdentLoc,
210 std::vector<IdentifierInfo *> &Ident,
211 std::vector<SourceLocation> &NamespaceLoc,
212 unsigned int index, SourceLocation &InlineLoc,
213 ParsedAttributes &attrs,
214 BalancedDelimiterTracker &Tracker) {
215 if (index == Ident.size()) {
216 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
217 Tok.isNot(tok::eof)) {
218 ParsedAttributesWithRange attrs(AttrFactory);
219 MaybeParseCXX11Attributes(attrs);
220 MaybeParseMicrosoftAttributes(attrs);
221 ParseExternalDeclaration(attrs);
222 }
223
224 // The caller is what called check -- we are simply calling
225 // the close for it.
226 Tracker.consumeClose();
227
228 return;
229 }
230
231 // Handle a nested namespace definition.
232 // FIXME: Preserve the source information through to the AST rather than
233 // desugaring it here.
234 ParseScope NamespaceScope(this, Scope::DeclScope);
235 UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
236 Decl *NamespcDecl =
237 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
238 NamespaceLoc[index], IdentLoc[index],
239 Ident[index], Tracker.getOpenLocation(),
240 attrs.getList(), ImplicitUsingDirectiveDecl);
241 assert(!ImplicitUsingDirectiveDecl &&
242 "nested namespace definition cannot define anonymous namespace");
243
244 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
245 attrs, Tracker);
246
247 NamespaceScope.Exit();
248 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
249 }
250
251 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
252 /// alias definition.
253 ///
ParseNamespaceAlias(SourceLocation NamespaceLoc,SourceLocation AliasLoc,IdentifierInfo * Alias,SourceLocation & DeclEnd)254 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
255 SourceLocation AliasLoc,
256 IdentifierInfo *Alias,
257 SourceLocation &DeclEnd) {
258 assert(Tok.is(tok::equal) && "Not equal token");
259
260 ConsumeToken(); // eat the '='.
261
262 if (Tok.is(tok::code_completion)) {
263 Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
264 cutOffParsing();
265 return nullptr;
266 }
267
268 CXXScopeSpec SS;
269 // Parse (optional) nested-name-specifier.
270 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
271
272 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
273 Diag(Tok, diag::err_expected_namespace_name);
274 // Skip to end of the definition and eat the ';'.
275 SkipUntil(tok::semi);
276 return nullptr;
277 }
278
279 // Parse identifier.
280 IdentifierInfo *Ident = Tok.getIdentifierInfo();
281 SourceLocation IdentLoc = ConsumeToken();
282
283 // Eat the ';'.
284 DeclEnd = Tok.getLocation();
285 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name))
286 SkipUntil(tok::semi);
287
288 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc,
289 Alias, SS, IdentLoc, Ident);
290 }
291
292 /// ParseLinkage - We know that the current token is a string_literal
293 /// and just before that, that extern was seen.
294 ///
295 /// linkage-specification: [C++ 7.5p2: dcl.link]
296 /// 'extern' string-literal '{' declaration-seq[opt] '}'
297 /// 'extern' string-literal declaration
298 ///
ParseLinkage(ParsingDeclSpec & DS,unsigned Context)299 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
300 assert(isTokenStringLiteral() && "Not a string literal!");
301 ExprResult Lang = ParseStringLiteralExpression(false);
302
303 ParseScope LinkageScope(this, Scope::DeclScope);
304 Decl *LinkageSpec =
305 Lang.isInvalid()
306 ? nullptr
307 : Actions.ActOnStartLinkageSpecification(
308 getCurScope(), DS.getSourceRange().getBegin(), Lang.get(),
309 Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
310
311 ParsedAttributesWithRange attrs(AttrFactory);
312 MaybeParseCXX11Attributes(attrs);
313 MaybeParseMicrosoftAttributes(attrs);
314
315 if (Tok.isNot(tok::l_brace)) {
316 // Reset the source range in DS, as the leading "extern"
317 // does not really belong to the inner declaration ...
318 DS.SetRangeStart(SourceLocation());
319 DS.SetRangeEnd(SourceLocation());
320 // ... but anyway remember that such an "extern" was seen.
321 DS.setExternInLinkageSpec(true);
322 ParseExternalDeclaration(attrs, &DS);
323 return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
324 getCurScope(), LinkageSpec, SourceLocation())
325 : nullptr;
326 }
327
328 DS.abort();
329
330 ProhibitAttributes(attrs);
331
332 BalancedDelimiterTracker T(*this, tok::l_brace);
333 T.consumeOpen();
334
335 unsigned NestedModules = 0;
336 while (true) {
337 switch (Tok.getKind()) {
338 case tok::annot_module_begin:
339 ++NestedModules;
340 ParseTopLevelDecl();
341 continue;
342
343 case tok::annot_module_end:
344 if (!NestedModules)
345 break;
346 --NestedModules;
347 ParseTopLevelDecl();
348 continue;
349
350 case tok::annot_module_include:
351 ParseTopLevelDecl();
352 continue;
353
354 case tok::eof:
355 break;
356
357 case tok::r_brace:
358 if (!NestedModules)
359 break;
360 // Fall through.
361 default:
362 ParsedAttributesWithRange attrs(AttrFactory);
363 MaybeParseCXX11Attributes(attrs);
364 MaybeParseMicrosoftAttributes(attrs);
365 ParseExternalDeclaration(attrs);
366 continue;
367 }
368
369 break;
370 }
371
372 T.consumeClose();
373 return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
374 getCurScope(), LinkageSpec, T.getCloseLocation())
375 : nullptr;
376 }
377
378 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
379 /// using-directive. Assumes that current token is 'using'.
ParseUsingDirectiveOrDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,Decl ** OwnedType)380 Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
381 const ParsedTemplateInfo &TemplateInfo,
382 SourceLocation &DeclEnd,
383 ParsedAttributesWithRange &attrs,
384 Decl **OwnedType) {
385 assert(Tok.is(tok::kw_using) && "Not using token");
386 ObjCDeclContextSwitch ObjCDC(*this);
387
388 // Eat 'using'.
389 SourceLocation UsingLoc = ConsumeToken();
390
391 if (Tok.is(tok::code_completion)) {
392 Actions.CodeCompleteUsing(getCurScope());
393 cutOffParsing();
394 return nullptr;
395 }
396
397 // 'using namespace' means this is a using-directive.
398 if (Tok.is(tok::kw_namespace)) {
399 // Template parameters are always an error here.
400 if (TemplateInfo.Kind) {
401 SourceRange R = TemplateInfo.getSourceRange();
402 Diag(UsingLoc, diag::err_templated_using_directive_declaration)
403 << 0 /* directive */ << R << FixItHint::CreateRemoval(R);
404 }
405
406 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
407 }
408
409 // Otherwise, it must be a using-declaration or an alias-declaration.
410
411 // Using declarations can't have attributes.
412 ProhibitAttributes(attrs);
413
414 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
415 AS_none, OwnedType);
416 }
417
418 /// ParseUsingDirective - Parse C++ using-directive, assumes
419 /// that current token is 'namespace' and 'using' was already parsed.
420 ///
421 /// using-directive: [C++ 7.3.p4: namespace.udir]
422 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
423 /// namespace-name ;
424 /// [GNU] using-directive:
425 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
426 /// namespace-name attributes[opt] ;
427 ///
ParseUsingDirective(unsigned Context,SourceLocation UsingLoc,SourceLocation & DeclEnd,ParsedAttributes & attrs)428 Decl *Parser::ParseUsingDirective(unsigned Context,
429 SourceLocation UsingLoc,
430 SourceLocation &DeclEnd,
431 ParsedAttributes &attrs) {
432 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
433
434 // Eat 'namespace'.
435 SourceLocation NamespcLoc = ConsumeToken();
436
437 if (Tok.is(tok::code_completion)) {
438 Actions.CodeCompleteUsingDirective(getCurScope());
439 cutOffParsing();
440 return nullptr;
441 }
442
443 CXXScopeSpec SS;
444 // Parse (optional) nested-name-specifier.
445 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
446
447 IdentifierInfo *NamespcName = nullptr;
448 SourceLocation IdentLoc = SourceLocation();
449
450 // Parse namespace-name.
451 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
452 Diag(Tok, diag::err_expected_namespace_name);
453 // If there was invalid namespace name, skip to end of decl, and eat ';'.
454 SkipUntil(tok::semi);
455 // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
456 return nullptr;
457 }
458
459 // Parse identifier.
460 NamespcName = Tok.getIdentifierInfo();
461 IdentLoc = ConsumeToken();
462
463 // Parse (optional) attributes (most likely GNU strong-using extension).
464 bool GNUAttr = false;
465 if (Tok.is(tok::kw___attribute)) {
466 GNUAttr = true;
467 ParseGNUAttributes(attrs);
468 }
469
470 // Eat ';'.
471 DeclEnd = Tok.getLocation();
472 if (ExpectAndConsume(tok::semi,
473 GNUAttr ? diag::err_expected_semi_after_attribute_list
474 : diag::err_expected_semi_after_namespace_name))
475 SkipUntil(tok::semi);
476
477 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
478 IdentLoc, NamespcName, attrs.getList());
479 }
480
481 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
482 /// Assumes that 'using' was already seen.
483 ///
484 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
485 /// 'using' 'typename'[opt] ::[opt] nested-name-specifier
486 /// unqualified-id
487 /// 'using' :: unqualified-id
488 ///
489 /// alias-declaration: C++11 [dcl.dcl]p1
490 /// 'using' identifier attribute-specifier-seq[opt] = type-id ;
491 ///
ParseUsingDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation UsingLoc,SourceLocation & DeclEnd,AccessSpecifier AS,Decl ** OwnedType)492 Decl *Parser::ParseUsingDeclaration(unsigned Context,
493 const ParsedTemplateInfo &TemplateInfo,
494 SourceLocation UsingLoc,
495 SourceLocation &DeclEnd,
496 AccessSpecifier AS,
497 Decl **OwnedType) {
498 CXXScopeSpec SS;
499 SourceLocation TypenameLoc;
500 bool HasTypenameKeyword = false;
501
502 // Check for misplaced attributes before the identifier in an
503 // alias-declaration.
504 ParsedAttributesWithRange MisplacedAttrs(AttrFactory);
505 MaybeParseCXX11Attributes(MisplacedAttrs);
506
507 // Ignore optional 'typename'.
508 // FIXME: This is wrong; we should parse this as a typename-specifier.
509 if (TryConsumeToken(tok::kw_typename, TypenameLoc))
510 HasTypenameKeyword = true;
511
512 if (Tok.is(tok::kw___super)) {
513 Diag(Tok.getLocation(), diag::err_super_in_using_declaration);
514 SkipUntil(tok::semi);
515 return nullptr;
516 }
517
518 // Parse nested-name-specifier.
519 IdentifierInfo *LastII = nullptr;
520 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false,
521 /*MayBePseudoDtor=*/nullptr,
522 /*IsTypename=*/false,
523 /*LastII=*/&LastII);
524
525 // Check nested-name specifier.
526 if (SS.isInvalid()) {
527 SkipUntil(tok::semi);
528 return nullptr;
529 }
530
531 SourceLocation TemplateKWLoc;
532 UnqualifiedId Name;
533
534 // Parse the unqualified-id. We allow parsing of both constructor and
535 // destructor names and allow the action module to diagnose any semantic
536 // errors.
537 //
538 // C++11 [class.qual]p2:
539 // [...] in a using-declaration that is a member-declaration, if the name
540 // specified after the nested-name-specifier is the same as the identifier
541 // or the simple-template-id's template-name in the last component of the
542 // nested-name-specifier, the name is [...] considered to name the
543 // constructor.
544 if (getLangOpts().CPlusPlus11 && Context == Declarator::MemberContext &&
545 Tok.is(tok::identifier) && NextToken().is(tok::semi) &&
546 SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
547 !SS.getScopeRep()->getAsNamespace() &&
548 !SS.getScopeRep()->getAsNamespaceAlias()) {
549 SourceLocation IdLoc = ConsumeToken();
550 ParsedType Type = Actions.getInheritingConstructorName(SS, IdLoc, *LastII);
551 Name.setConstructorName(Type, IdLoc, IdLoc);
552 } else if (ParseUnqualifiedId(
553 SS, /*EnteringContext=*/false,
554 /*AllowDestructorName=*/true,
555 /*AllowConstructorName=*/!(Tok.is(tok::identifier) &&
556 NextToken().is(tok::equal)),
557 ParsedType(), TemplateKWLoc, Name)) {
558 SkipUntil(tok::semi);
559 return nullptr;
560 }
561
562 ParsedAttributesWithRange Attrs(AttrFactory);
563 MaybeParseGNUAttributes(Attrs);
564 MaybeParseCXX11Attributes(Attrs);
565
566 // Maybe this is an alias-declaration.
567 TypeResult TypeAlias;
568 bool IsAliasDecl = Tok.is(tok::equal);
569 Decl *DeclFromDeclSpec = nullptr;
570 if (IsAliasDecl) {
571 // If we had any misplaced attributes from earlier, this is where they
572 // should have been written.
573 if (MisplacedAttrs.Range.isValid()) {
574 Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed)
575 << FixItHint::CreateInsertionFromRange(
576 Tok.getLocation(),
577 CharSourceRange::getTokenRange(MisplacedAttrs.Range))
578 << FixItHint::CreateRemoval(MisplacedAttrs.Range);
579 Attrs.takeAllFrom(MisplacedAttrs);
580 }
581
582 ConsumeToken();
583
584 Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
585 diag::warn_cxx98_compat_alias_declaration :
586 diag::ext_alias_declaration);
587
588 // Type alias templates cannot be specialized.
589 int SpecKind = -1;
590 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
591 Name.getKind() == UnqualifiedId::IK_TemplateId)
592 SpecKind = 0;
593 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
594 SpecKind = 1;
595 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
596 SpecKind = 2;
597 if (SpecKind != -1) {
598 SourceRange Range;
599 if (SpecKind == 0)
600 Range = SourceRange(Name.TemplateId->LAngleLoc,
601 Name.TemplateId->RAngleLoc);
602 else
603 Range = TemplateInfo.getSourceRange();
604 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
605 << SpecKind << Range;
606 SkipUntil(tok::semi);
607 return nullptr;
608 }
609
610 // Name must be an identifier.
611 if (Name.getKind() != UnqualifiedId::IK_Identifier) {
612 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
613 // No removal fixit: can't recover from this.
614 SkipUntil(tok::semi);
615 return nullptr;
616 } else if (HasTypenameKeyword)
617 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
618 << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
619 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
620 else if (SS.isNotEmpty())
621 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
622 << FixItHint::CreateRemoval(SS.getRange());
623
624 TypeAlias = ParseTypeName(nullptr, TemplateInfo.Kind
625 ? Declarator::AliasTemplateContext
626 : Declarator::AliasDeclContext,
627 AS, &DeclFromDeclSpec, &Attrs);
628 if (OwnedType)
629 *OwnedType = DeclFromDeclSpec;
630 } else {
631 // C++11 attributes are not allowed on a using-declaration, but GNU ones
632 // are.
633 ProhibitAttributes(MisplacedAttrs);
634 ProhibitAttributes(Attrs);
635
636 // Parse (optional) attributes (most likely GNU strong-using extension).
637 MaybeParseGNUAttributes(Attrs);
638 }
639
640 // Eat ';'.
641 DeclEnd = Tok.getLocation();
642 if (ExpectAndConsume(tok::semi, diag::err_expected_after,
643 !Attrs.empty() ? "attributes list"
644 : IsAliasDecl ? "alias declaration"
645 : "using declaration"))
646 SkipUntil(tok::semi);
647
648 // Diagnose an attempt to declare a templated using-declaration.
649 // In C++11, alias-declarations can be templates:
650 // template <...> using id = type;
651 if (TemplateInfo.Kind && !IsAliasDecl) {
652 SourceRange R = TemplateInfo.getSourceRange();
653 Diag(UsingLoc, diag::err_templated_using_directive_declaration)
654 << 1 /* declaration */ << R << FixItHint::CreateRemoval(R);
655
656 // Unfortunately, we have to bail out instead of recovering by
657 // ignoring the parameters, just in case the nested name specifier
658 // depends on the parameters.
659 return nullptr;
660 }
661
662 // "typename" keyword is allowed for identifiers only,
663 // because it may be a type definition.
664 if (HasTypenameKeyword && Name.getKind() != UnqualifiedId::IK_Identifier) {
665 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only)
666 << FixItHint::CreateRemoval(SourceRange(TypenameLoc));
667 // Proceed parsing, but reset the HasTypenameKeyword flag.
668 HasTypenameKeyword = false;
669 }
670
671 if (IsAliasDecl) {
672 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
673 MultiTemplateParamsArg TemplateParamsArg(
674 TemplateParams ? TemplateParams->data() : nullptr,
675 TemplateParams ? TemplateParams->size() : 0);
676 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
677 UsingLoc, Name, Attrs.getList(),
678 TypeAlias, DeclFromDeclSpec);
679 }
680
681 return Actions.ActOnUsingDeclaration(getCurScope(), AS,
682 /* HasUsingKeyword */ true, UsingLoc,
683 SS, Name, Attrs.getList(),
684 HasTypenameKeyword, TypenameLoc);
685 }
686
687 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
688 ///
689 /// [C++0x] static_assert-declaration:
690 /// static_assert ( constant-expression , string-literal ) ;
691 ///
692 /// [C11] static_assert-declaration:
693 /// _Static_assert ( constant-expression , string-literal ) ;
694 ///
ParseStaticAssertDeclaration(SourceLocation & DeclEnd)695 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
696 assert(Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) &&
697 "Not a static_assert declaration");
698
699 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
700 Diag(Tok, diag::ext_c11_static_assert);
701 if (Tok.is(tok::kw_static_assert))
702 Diag(Tok, diag::warn_cxx98_compat_static_assert);
703
704 SourceLocation StaticAssertLoc = ConsumeToken();
705
706 BalancedDelimiterTracker T(*this, tok::l_paren);
707 if (T.consumeOpen()) {
708 Diag(Tok, diag::err_expected) << tok::l_paren;
709 SkipMalformedDecl();
710 return nullptr;
711 }
712
713 ExprResult AssertExpr(ParseConstantExpression());
714 if (AssertExpr.isInvalid()) {
715 SkipMalformedDecl();
716 return nullptr;
717 }
718
719 ExprResult AssertMessage;
720 if (Tok.is(tok::r_paren)) {
721 Diag(Tok, getLangOpts().CPlusPlus1z
722 ? diag::warn_cxx14_compat_static_assert_no_message
723 : diag::ext_static_assert_no_message)
724 << (getLangOpts().CPlusPlus1z
725 ? FixItHint()
726 : FixItHint::CreateInsertion(Tok.getLocation(), ", \"\""));
727 } else {
728 if (ExpectAndConsume(tok::comma)) {
729 SkipUntil(tok::semi);
730 return nullptr;
731 }
732
733 if (!isTokenStringLiteral()) {
734 Diag(Tok, diag::err_expected_string_literal)
735 << /*Source='static_assert'*/1;
736 SkipMalformedDecl();
737 return nullptr;
738 }
739
740 AssertMessage = ParseStringLiteralExpression();
741 if (AssertMessage.isInvalid()) {
742 SkipMalformedDecl();
743 return nullptr;
744 }
745 }
746
747 T.consumeClose();
748
749 DeclEnd = Tok.getLocation();
750 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
751
752 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
753 AssertExpr.get(),
754 AssertMessage.get(),
755 T.getCloseLocation());
756 }
757
758 /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
759 ///
760 /// 'decltype' ( expression )
761 /// 'decltype' ( 'auto' ) [C++1y]
762 ///
ParseDecltypeSpecifier(DeclSpec & DS)763 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
764 assert(Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)
765 && "Not a decltype specifier");
766
767 ExprResult Result;
768 SourceLocation StartLoc = Tok.getLocation();
769 SourceLocation EndLoc;
770
771 if (Tok.is(tok::annot_decltype)) {
772 Result = getExprAnnotation(Tok);
773 EndLoc = Tok.getAnnotationEndLoc();
774 ConsumeToken();
775 if (Result.isInvalid()) {
776 DS.SetTypeSpecError();
777 return EndLoc;
778 }
779 } else {
780 if (Tok.getIdentifierInfo()->isStr("decltype"))
781 Diag(Tok, diag::warn_cxx98_compat_decltype);
782
783 ConsumeToken();
784
785 BalancedDelimiterTracker T(*this, tok::l_paren);
786 if (T.expectAndConsume(diag::err_expected_lparen_after,
787 "decltype", tok::r_paren)) {
788 DS.SetTypeSpecError();
789 return T.getOpenLocation() == Tok.getLocation() ?
790 StartLoc : T.getOpenLocation();
791 }
792
793 // Check for C++1y 'decltype(auto)'.
794 if (Tok.is(tok::kw_auto)) {
795 // No need to disambiguate here: an expression can't start with 'auto',
796 // because the typename-specifier in a function-style cast operation can't
797 // be 'auto'.
798 Diag(Tok.getLocation(),
799 getLangOpts().CPlusPlus14
800 ? diag::warn_cxx11_compat_decltype_auto_type_specifier
801 : diag::ext_decltype_auto_type_specifier);
802 ConsumeToken();
803 } else {
804 // Parse the expression
805
806 // C++11 [dcl.type.simple]p4:
807 // The operand of the decltype specifier is an unevaluated operand.
808 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
809 nullptr,/*IsDecltype=*/true);
810 Result =
811 Actions.CorrectDelayedTyposInExpr(ParseExpression(), [](Expr *E) {
812 return E->hasPlaceholderType() ? ExprError() : E;
813 });
814 if (Result.isInvalid()) {
815 DS.SetTypeSpecError();
816 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
817 EndLoc = ConsumeParen();
818 } else {
819 if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
820 // Backtrack to get the location of the last token before the semi.
821 PP.RevertCachedTokens(2);
822 ConsumeToken(); // the semi.
823 EndLoc = ConsumeAnyToken();
824 assert(Tok.is(tok::semi));
825 } else {
826 EndLoc = Tok.getLocation();
827 }
828 }
829 return EndLoc;
830 }
831
832 Result = Actions.ActOnDecltypeExpression(Result.get());
833 }
834
835 // Match the ')'
836 T.consumeClose();
837 if (T.getCloseLocation().isInvalid()) {
838 DS.SetTypeSpecError();
839 // FIXME: this should return the location of the last token
840 // that was consumed (by "consumeClose()")
841 return T.getCloseLocation();
842 }
843
844 if (Result.isInvalid()) {
845 DS.SetTypeSpecError();
846 return T.getCloseLocation();
847 }
848
849 EndLoc = T.getCloseLocation();
850 }
851 assert(!Result.isInvalid());
852
853 const char *PrevSpec = nullptr;
854 unsigned DiagID;
855 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
856 // Check for duplicate type specifiers (e.g. "int decltype(a)").
857 if (Result.get()
858 ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
859 DiagID, Result.get(), Policy)
860 : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
861 DiagID, Policy)) {
862 Diag(StartLoc, DiagID) << PrevSpec;
863 DS.SetTypeSpecError();
864 }
865 return EndLoc;
866 }
867
AnnotateExistingDecltypeSpecifier(const DeclSpec & DS,SourceLocation StartLoc,SourceLocation EndLoc)868 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
869 SourceLocation StartLoc,
870 SourceLocation EndLoc) {
871 // make sure we have a token we can turn into an annotation token
872 if (PP.isBacktrackEnabled())
873 PP.RevertCachedTokens(1);
874 else
875 PP.EnterToken(Tok);
876
877 Tok.setKind(tok::annot_decltype);
878 setExprAnnotation(Tok,
879 DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() :
880 DS.getTypeSpecType() == TST_decltype_auto ? ExprResult() :
881 ExprError());
882 Tok.setAnnotationEndLoc(EndLoc);
883 Tok.setLocation(StartLoc);
884 PP.AnnotateCachedTokens(Tok);
885 }
886
ParseUnderlyingTypeSpecifier(DeclSpec & DS)887 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
888 assert(Tok.is(tok::kw___underlying_type) &&
889 "Not an underlying type specifier");
890
891 SourceLocation StartLoc = ConsumeToken();
892 BalancedDelimiterTracker T(*this, tok::l_paren);
893 if (T.expectAndConsume(diag::err_expected_lparen_after,
894 "__underlying_type", tok::r_paren)) {
895 return;
896 }
897
898 TypeResult Result = ParseTypeName();
899 if (Result.isInvalid()) {
900 SkipUntil(tok::r_paren, StopAtSemi);
901 return;
902 }
903
904 // Match the ')'
905 T.consumeClose();
906 if (T.getCloseLocation().isInvalid())
907 return;
908
909 const char *PrevSpec = nullptr;
910 unsigned DiagID;
911 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
912 DiagID, Result.get(),
913 Actions.getASTContext().getPrintingPolicy()))
914 Diag(StartLoc, DiagID) << PrevSpec;
915 DS.setTypeofParensRange(T.getRange());
916 }
917
918 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
919 /// class name or decltype-specifier. Note that we only check that the result
920 /// names a type; semantic analysis will need to verify that the type names a
921 /// class. The result is either a type or null, depending on whether a type
922 /// name was found.
923 ///
924 /// base-type-specifier: [C++11 class.derived]
925 /// class-or-decltype
926 /// class-or-decltype: [C++11 class.derived]
927 /// nested-name-specifier[opt] class-name
928 /// decltype-specifier
929 /// class-name: [C++ class.name]
930 /// identifier
931 /// simple-template-id
932 ///
933 /// In C++98, instead of base-type-specifier, we have:
934 ///
935 /// ::[opt] nested-name-specifier[opt] class-name
ParseBaseTypeSpecifier(SourceLocation & BaseLoc,SourceLocation & EndLocation)936 TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
937 SourceLocation &EndLocation) {
938 // Ignore attempts to use typename
939 if (Tok.is(tok::kw_typename)) {
940 Diag(Tok, diag::err_expected_class_name_not_template)
941 << FixItHint::CreateRemoval(Tok.getLocation());
942 ConsumeToken();
943 }
944
945 // Parse optional nested-name-specifier
946 CXXScopeSpec SS;
947 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
948
949 BaseLoc = Tok.getLocation();
950
951 // Parse decltype-specifier
952 // tok == kw_decltype is just error recovery, it can only happen when SS
953 // isn't empty
954 if (Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
955 if (SS.isNotEmpty())
956 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
957 << FixItHint::CreateRemoval(SS.getRange());
958 // Fake up a Declarator to use with ActOnTypeName.
959 DeclSpec DS(AttrFactory);
960
961 EndLocation = ParseDecltypeSpecifier(DS);
962
963 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
964 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
965 }
966
967 // Check whether we have a template-id that names a type.
968 if (Tok.is(tok::annot_template_id)) {
969 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
970 if (TemplateId->Kind == TNK_Type_template ||
971 TemplateId->Kind == TNK_Dependent_template_name) {
972 AnnotateTemplateIdTokenAsType();
973
974 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
975 ParsedType Type = getTypeAnnotation(Tok);
976 EndLocation = Tok.getAnnotationEndLoc();
977 ConsumeToken();
978
979 if (Type)
980 return Type;
981 return true;
982 }
983
984 // Fall through to produce an error below.
985 }
986
987 if (Tok.isNot(tok::identifier)) {
988 Diag(Tok, diag::err_expected_class_name);
989 return true;
990 }
991
992 IdentifierInfo *Id = Tok.getIdentifierInfo();
993 SourceLocation IdLoc = ConsumeToken();
994
995 if (Tok.is(tok::less)) {
996 // It looks the user intended to write a template-id here, but the
997 // template-name was wrong. Try to fix that.
998 TemplateNameKind TNK = TNK_Type_template;
999 TemplateTy Template;
1000 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
1001 &SS, Template, TNK)) {
1002 Diag(IdLoc, diag::err_unknown_template_name)
1003 << Id;
1004 }
1005
1006 if (!Template) {
1007 TemplateArgList TemplateArgs;
1008 SourceLocation LAngleLoc, RAngleLoc;
1009 ParseTemplateIdAfterTemplateName(TemplateTy(), IdLoc, SS,
1010 true, LAngleLoc, TemplateArgs, RAngleLoc);
1011 return true;
1012 }
1013
1014 // Form the template name
1015 UnqualifiedId TemplateName;
1016 TemplateName.setIdentifier(Id, IdLoc);
1017
1018 // Parse the full template-id, then turn it into a type.
1019 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1020 TemplateName, true))
1021 return true;
1022 if (TNK == TNK_Dependent_template_name)
1023 AnnotateTemplateIdTokenAsType();
1024
1025 // If we didn't end up with a typename token, there's nothing more we
1026 // can do.
1027 if (Tok.isNot(tok::annot_typename))
1028 return true;
1029
1030 // Retrieve the type from the annotation token, consume that token, and
1031 // return.
1032 EndLocation = Tok.getAnnotationEndLoc();
1033 ParsedType Type = getTypeAnnotation(Tok);
1034 ConsumeToken();
1035 return Type;
1036 }
1037
1038 // We have an identifier; check whether it is actually a type.
1039 IdentifierInfo *CorrectedII = nullptr;
1040 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
1041 false, ParsedType(),
1042 /*IsCtorOrDtorName=*/false,
1043 /*NonTrivialTypeSourceInfo=*/true,
1044 &CorrectedII);
1045 if (!Type) {
1046 Diag(IdLoc, diag::err_expected_class_name);
1047 return true;
1048 }
1049
1050 // Consume the identifier.
1051 EndLocation = IdLoc;
1052
1053 // Fake up a Declarator to use with ActOnTypeName.
1054 DeclSpec DS(AttrFactory);
1055 DS.SetRangeStart(IdLoc);
1056 DS.SetRangeEnd(EndLocation);
1057 DS.getTypeSpecScope() = SS;
1058
1059 const char *PrevSpec = nullptr;
1060 unsigned DiagID;
1061 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type,
1062 Actions.getASTContext().getPrintingPolicy());
1063
1064 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1065 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1066 }
1067
ParseMicrosoftInheritanceClassAttributes(ParsedAttributes & attrs)1068 void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
1069 while (Tok.isOneOf(tok::kw___single_inheritance,
1070 tok::kw___multiple_inheritance,
1071 tok::kw___virtual_inheritance)) {
1072 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1073 SourceLocation AttrNameLoc = ConsumeToken();
1074 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
1075 AttributeList::AS_Keyword);
1076 }
1077 }
1078
1079 /// Determine whether the following tokens are valid after a type-specifier
1080 /// which could be a standalone declaration. This will conservatively return
1081 /// true if there's any doubt, and is appropriate for insert-';' fixits.
isValidAfterTypeSpecifier(bool CouldBeBitfield)1082 bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
1083 // This switch enumerates the valid "follow" set for type-specifiers.
1084 switch (Tok.getKind()) {
1085 default: break;
1086 case tok::semi: // struct foo {...} ;
1087 case tok::star: // struct foo {...} * P;
1088 case tok::amp: // struct foo {...} & R = ...
1089 case tok::ampamp: // struct foo {...} && R = ...
1090 case tok::identifier: // struct foo {...} V ;
1091 case tok::r_paren: //(struct foo {...} ) {4}
1092 case tok::annot_cxxscope: // struct foo {...} a:: b;
1093 case tok::annot_typename: // struct foo {...} a ::b;
1094 case tok::annot_template_id: // struct foo {...} a<int> ::b;
1095 case tok::l_paren: // struct foo {...} ( x);
1096 case tok::comma: // __builtin_offsetof(struct foo{...} ,
1097 case tok::kw_operator: // struct foo operator ++() {...}
1098 case tok::kw___declspec: // struct foo {...} __declspec(...)
1099 case tok::l_square: // void f(struct f [ 3])
1100 case tok::ellipsis: // void f(struct f ... [Ns])
1101 // FIXME: we should emit semantic diagnostic when declaration
1102 // attribute is in type attribute position.
1103 case tok::kw___attribute: // struct foo __attribute__((used)) x;
1104 return true;
1105 case tok::colon:
1106 return CouldBeBitfield; // enum E { ... } : 2;
1107 // Type qualifiers
1108 case tok::kw_const: // struct foo {...} const x;
1109 case tok::kw_volatile: // struct foo {...} volatile x;
1110 case tok::kw_restrict: // struct foo {...} restrict x;
1111 case tok::kw__Atomic: // struct foo {...} _Atomic x;
1112 case tok::kw___unaligned: // struct foo {...} __unaligned *x;
1113 // Function specifiers
1114 // Note, no 'explicit'. An explicit function must be either a conversion
1115 // operator or a constructor. Either way, it can't have a return type.
1116 case tok::kw_inline: // struct foo inline f();
1117 case tok::kw_virtual: // struct foo virtual f();
1118 case tok::kw_friend: // struct foo friend f();
1119 // Storage-class specifiers
1120 case tok::kw_static: // struct foo {...} static x;
1121 case tok::kw_extern: // struct foo {...} extern x;
1122 case tok::kw_typedef: // struct foo {...} typedef x;
1123 case tok::kw_register: // struct foo {...} register x;
1124 case tok::kw_auto: // struct foo {...} auto x;
1125 case tok::kw_mutable: // struct foo {...} mutable x;
1126 case tok::kw_thread_local: // struct foo {...} thread_local x;
1127 case tok::kw_constexpr: // struct foo {...} constexpr x;
1128 // As shown above, type qualifiers and storage class specifiers absolutely
1129 // can occur after class specifiers according to the grammar. However,
1130 // almost no one actually writes code like this. If we see one of these,
1131 // it is much more likely that someone missed a semi colon and the
1132 // type/storage class specifier we're seeing is part of the *next*
1133 // intended declaration, as in:
1134 //
1135 // struct foo { ... }
1136 // typedef int X;
1137 //
1138 // We'd really like to emit a missing semicolon error instead of emitting
1139 // an error on the 'int' saying that you can't have two type specifiers in
1140 // the same declaration of X. Because of this, we look ahead past this
1141 // token to see if it's a type specifier. If so, we know the code is
1142 // otherwise invalid, so we can produce the expected semi error.
1143 if (!isKnownToBeTypeSpecifier(NextToken()))
1144 return true;
1145 break;
1146 case tok::r_brace: // struct bar { struct foo {...} }
1147 // Missing ';' at end of struct is accepted as an extension in C mode.
1148 if (!getLangOpts().CPlusPlus)
1149 return true;
1150 break;
1151 case tok::greater:
1152 // template<class T = class X>
1153 return getLangOpts().CPlusPlus;
1154 }
1155 return false;
1156 }
1157
1158 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1159 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1160 /// until we reach the start of a definition or see a token that
1161 /// cannot start a definition.
1162 ///
1163 /// class-specifier: [C++ class]
1164 /// class-head '{' member-specification[opt] '}'
1165 /// class-head '{' member-specification[opt] '}' attributes[opt]
1166 /// class-head:
1167 /// class-key identifier[opt] base-clause[opt]
1168 /// class-key nested-name-specifier identifier base-clause[opt]
1169 /// class-key nested-name-specifier[opt] simple-template-id
1170 /// base-clause[opt]
1171 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1172 /// [GNU] class-key attributes[opt] nested-name-specifier
1173 /// identifier base-clause[opt]
1174 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1175 /// simple-template-id base-clause[opt]
1176 /// class-key:
1177 /// 'class'
1178 /// 'struct'
1179 /// 'union'
1180 ///
1181 /// elaborated-type-specifier: [C++ dcl.type.elab]
1182 /// class-key ::[opt] nested-name-specifier[opt] identifier
1183 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1184 /// simple-template-id
1185 ///
1186 /// Note that the C++ class-specifier and elaborated-type-specifier,
1187 /// together, subsume the C99 struct-or-union-specifier:
1188 ///
1189 /// struct-or-union-specifier: [C99 6.7.2.1]
1190 /// struct-or-union identifier[opt] '{' struct-contents '}'
1191 /// struct-or-union identifier
1192 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1193 /// '}' attributes[opt]
1194 /// [GNU] struct-or-union attributes[opt] identifier
1195 /// struct-or-union:
1196 /// 'struct'
1197 /// 'union'
ParseClassSpecifier(tok::TokenKind TagTokKind,SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,bool EnteringContext,DeclSpecContext DSC,ParsedAttributesWithRange & Attributes)1198 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1199 SourceLocation StartLoc, DeclSpec &DS,
1200 const ParsedTemplateInfo &TemplateInfo,
1201 AccessSpecifier AS,
1202 bool EnteringContext, DeclSpecContext DSC,
1203 ParsedAttributesWithRange &Attributes) {
1204 DeclSpec::TST TagType;
1205 if (TagTokKind == tok::kw_struct)
1206 TagType = DeclSpec::TST_struct;
1207 else if (TagTokKind == tok::kw___interface)
1208 TagType = DeclSpec::TST_interface;
1209 else if (TagTokKind == tok::kw_class)
1210 TagType = DeclSpec::TST_class;
1211 else {
1212 assert(TagTokKind == tok::kw_union && "Not a class specifier");
1213 TagType = DeclSpec::TST_union;
1214 }
1215
1216 if (Tok.is(tok::code_completion)) {
1217 // Code completion for a struct, class, or union name.
1218 Actions.CodeCompleteTag(getCurScope(), TagType);
1219 return cutOffParsing();
1220 }
1221
1222 // C++03 [temp.explicit] 14.7.2/8:
1223 // The usual access checking rules do not apply to names used to specify
1224 // explicit instantiations.
1225 //
1226 // As an extension we do not perform access checking on the names used to
1227 // specify explicit specializations either. This is important to allow
1228 // specializing traits classes for private types.
1229 //
1230 // Note that we don't suppress if this turns out to be an elaborated
1231 // type specifier.
1232 bool shouldDelayDiagsInTag =
1233 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1234 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1235 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1236
1237 ParsedAttributesWithRange attrs(AttrFactory);
1238 // If attributes exist after tag, parse them.
1239 MaybeParseGNUAttributes(attrs);
1240 MaybeParseMicrosoftDeclSpecs(attrs);
1241
1242 // Parse inheritance specifiers.
1243 if (Tok.isOneOf(tok::kw___single_inheritance,
1244 tok::kw___multiple_inheritance,
1245 tok::kw___virtual_inheritance))
1246 ParseMicrosoftInheritanceClassAttributes(attrs);
1247
1248 // If C++0x attributes exist here, parse them.
1249 // FIXME: Are we consistent with the ordering of parsing of different
1250 // styles of attributes?
1251 MaybeParseCXX11Attributes(attrs);
1252
1253 // Source location used by FIXIT to insert misplaced
1254 // C++11 attributes
1255 SourceLocation AttrFixitLoc = Tok.getLocation();
1256
1257 if (TagType == DeclSpec::TST_struct &&
1258 Tok.isNot(tok::identifier) &&
1259 !Tok.isAnnotation() &&
1260 Tok.getIdentifierInfo() &&
1261 Tok.isOneOf(tok::kw___is_abstract,
1262 tok::kw___is_arithmetic,
1263 tok::kw___is_array,
1264 tok::kw___is_base_of,
1265 tok::kw___is_class,
1266 tok::kw___is_complete_type,
1267 tok::kw___is_compound,
1268 tok::kw___is_const,
1269 tok::kw___is_constructible,
1270 tok::kw___is_convertible,
1271 tok::kw___is_convertible_to,
1272 tok::kw___is_destructible,
1273 tok::kw___is_empty,
1274 tok::kw___is_enum,
1275 tok::kw___is_floating_point,
1276 tok::kw___is_final,
1277 tok::kw___is_function,
1278 tok::kw___is_fundamental,
1279 tok::kw___is_integral,
1280 tok::kw___is_interface_class,
1281 tok::kw___is_literal,
1282 tok::kw___is_lvalue_expr,
1283 tok::kw___is_lvalue_reference,
1284 tok::kw___is_member_function_pointer,
1285 tok::kw___is_member_object_pointer,
1286 tok::kw___is_member_pointer,
1287 tok::kw___is_nothrow_assignable,
1288 tok::kw___is_nothrow_constructible,
1289 tok::kw___is_nothrow_destructible,
1290 tok::kw___is_object,
1291 tok::kw___is_pod,
1292 tok::kw___is_pointer,
1293 tok::kw___is_polymorphic,
1294 tok::kw___is_reference,
1295 tok::kw___is_rvalue_expr,
1296 tok::kw___is_rvalue_reference,
1297 tok::kw___is_same,
1298 tok::kw___is_scalar,
1299 tok::kw___is_sealed,
1300 tok::kw___is_signed,
1301 tok::kw___is_standard_layout,
1302 tok::kw___is_trivial,
1303 tok::kw___is_trivially_assignable,
1304 tok::kw___is_trivially_constructible,
1305 tok::kw___is_trivially_copyable,
1306 tok::kw___is_union,
1307 tok::kw___is_unsigned,
1308 tok::kw___is_void,
1309 tok::kw___is_volatile))
1310 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1311 // name of struct templates, but some are keywords in GCC >= 4.3
1312 // and Clang. Therefore, when we see the token sequence "struct
1313 // X", make X into a normal identifier rather than a keyword, to
1314 // allow libstdc++ 4.2 and libc++ to work properly.
1315 TryKeywordIdentFallback(true);
1316
1317 struct PreserveAtomicIdentifierInfoRAII {
1318 PreserveAtomicIdentifierInfoRAII(Token &Tok, bool Enabled)
1319 : AtomicII(nullptr) {
1320 if (!Enabled)
1321 return;
1322 assert(Tok.is(tok::kw__Atomic));
1323 AtomicII = Tok.getIdentifierInfo();
1324 AtomicII->revertTokenIDToIdentifier();
1325 Tok.setKind(tok::identifier);
1326 }
1327 ~PreserveAtomicIdentifierInfoRAII() {
1328 if (!AtomicII)
1329 return;
1330 AtomicII->revertIdentifierToTokenID(tok::kw__Atomic);
1331 }
1332 IdentifierInfo *AtomicII;
1333 };
1334
1335 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
1336 // implementation for VS2013 uses _Atomic as an identifier for one of the
1337 // classes in <atomic>. When we are parsing 'struct _Atomic', don't consider
1338 // '_Atomic' to be a keyword. We are careful to undo this so that clang can
1339 // use '_Atomic' in its own header files.
1340 bool ShouldChangeAtomicToIdentifier = getLangOpts().MSVCCompat &&
1341 Tok.is(tok::kw__Atomic) &&
1342 TagType == DeclSpec::TST_struct;
1343 PreserveAtomicIdentifierInfoRAII AtomicTokenGuard(
1344 Tok, ShouldChangeAtomicToIdentifier);
1345
1346 // Parse the (optional) nested-name-specifier.
1347 CXXScopeSpec &SS = DS.getTypeSpecScope();
1348 if (getLangOpts().CPlusPlus) {
1349 // "FOO : BAR" is not a potential typo for "FOO::BAR". In this context it
1350 // is a base-specifier-list.
1351 ColonProtectionRAIIObject X(*this);
1352
1353 CXXScopeSpec Spec;
1354 bool HasValidSpec = true;
1355 if (ParseOptionalCXXScopeSpecifier(Spec, ParsedType(), EnteringContext)) {
1356 DS.SetTypeSpecError();
1357 HasValidSpec = false;
1358 }
1359 if (Spec.isSet())
1360 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) {
1361 Diag(Tok, diag::err_expected) << tok::identifier;
1362 HasValidSpec = false;
1363 }
1364 if (HasValidSpec)
1365 SS = Spec;
1366 }
1367
1368 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1369
1370 // Parse the (optional) class name or simple-template-id.
1371 IdentifierInfo *Name = nullptr;
1372 SourceLocation NameLoc;
1373 TemplateIdAnnotation *TemplateId = nullptr;
1374 if (Tok.is(tok::identifier)) {
1375 Name = Tok.getIdentifierInfo();
1376 NameLoc = ConsumeToken();
1377
1378 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1379 // The name was supposed to refer to a template, but didn't.
1380 // Eat the template argument list and try to continue parsing this as
1381 // a class (or template thereof).
1382 TemplateArgList TemplateArgs;
1383 SourceLocation LAngleLoc, RAngleLoc;
1384 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
1385 true, LAngleLoc,
1386 TemplateArgs, RAngleLoc)) {
1387 // We couldn't parse the template argument list at all, so don't
1388 // try to give any location information for the list.
1389 LAngleLoc = RAngleLoc = SourceLocation();
1390 }
1391
1392 Diag(NameLoc, diag::err_explicit_spec_non_template)
1393 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1394 << TagTokKind << Name << SourceRange(LAngleLoc, RAngleLoc);
1395
1396 // Strip off the last template parameter list if it was empty, since
1397 // we've removed its template argument list.
1398 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1399 if (TemplateParams && TemplateParams->size() > 1) {
1400 TemplateParams->pop_back();
1401 } else {
1402 TemplateParams = nullptr;
1403 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1404 = ParsedTemplateInfo::NonTemplate;
1405 }
1406 } else if (TemplateInfo.Kind
1407 == ParsedTemplateInfo::ExplicitInstantiation) {
1408 // Pretend this is just a forward declaration.
1409 TemplateParams = nullptr;
1410 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1411 = ParsedTemplateInfo::NonTemplate;
1412 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
1413 = SourceLocation();
1414 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
1415 = SourceLocation();
1416 }
1417 }
1418 } else if (Tok.is(tok::annot_template_id)) {
1419 TemplateId = takeTemplateIdAnnotation(Tok);
1420 NameLoc = ConsumeToken();
1421
1422 if (TemplateId->Kind != TNK_Type_template &&
1423 TemplateId->Kind != TNK_Dependent_template_name) {
1424 // The template-name in the simple-template-id refers to
1425 // something other than a class template. Give an appropriate
1426 // error message and skip to the ';'.
1427 SourceRange Range(NameLoc);
1428 if (SS.isNotEmpty())
1429 Range.setBegin(SS.getBeginLoc());
1430
1431 // FIXME: Name may be null here.
1432 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1433 << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;
1434
1435 DS.SetTypeSpecError();
1436 SkipUntil(tok::semi, StopBeforeMatch);
1437 return;
1438 }
1439 }
1440
1441 // There are four options here.
1442 // - If we are in a trailing return type, this is always just a reference,
1443 // and we must not try to parse a definition. For instance,
1444 // [] () -> struct S { };
1445 // does not define a type.
1446 // - If we have 'struct foo {...', 'struct foo :...',
1447 // 'struct foo final :' or 'struct foo final {', then this is a definition.
1448 // - If we have 'struct foo;', then this is either a forward declaration
1449 // or a friend declaration, which have to be treated differently.
1450 // - Otherwise we have something like 'struct foo xyz', a reference.
1451 //
1452 // We also detect these erroneous cases to provide better diagnostic for
1453 // C++11 attributes parsing.
1454 // - attributes follow class name:
1455 // struct foo [[]] {};
1456 // - attributes appear before or after 'final':
1457 // struct foo [[]] final [[]] {};
1458 //
1459 // However, in type-specifier-seq's, things look like declarations but are
1460 // just references, e.g.
1461 // new struct s;
1462 // or
1463 // &T::operator struct s;
1464 // For these, DSC is DSC_type_specifier or DSC_alias_declaration.
1465
1466 // If there are attributes after class name, parse them.
1467 MaybeParseCXX11Attributes(Attributes);
1468
1469 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1470 Sema::TagUseKind TUK;
1471 if (DSC == DSC_trailing)
1472 TUK = Sema::TUK_Reference;
1473 else if (Tok.is(tok::l_brace) ||
1474 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1475 (isCXX11FinalKeyword() &&
1476 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1477 if (DS.isFriendSpecified()) {
1478 // C++ [class.friend]p2:
1479 // A class shall not be defined in a friend declaration.
1480 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1481 << SourceRange(DS.getFriendSpecLoc());
1482
1483 // Skip everything up to the semicolon, so that this looks like a proper
1484 // friend class (or template thereof) declaration.
1485 SkipUntil(tok::semi, StopBeforeMatch);
1486 TUK = Sema::TUK_Friend;
1487 } else {
1488 // Okay, this is a class definition.
1489 TUK = Sema::TUK_Definition;
1490 }
1491 } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) ||
1492 NextToken().is(tok::kw_alignas))) {
1493 // We can't tell if this is a definition or reference
1494 // until we skipped the 'final' and C++11 attribute specifiers.
1495 TentativeParsingAction PA(*this);
1496
1497 // Skip the 'final' keyword.
1498 ConsumeToken();
1499
1500 // Skip C++11 attribute specifiers.
1501 while (true) {
1502 if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
1503 ConsumeBracket();
1504 if (!SkipUntil(tok::r_square, StopAtSemi))
1505 break;
1506 } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
1507 ConsumeToken();
1508 ConsumeParen();
1509 if (!SkipUntil(tok::r_paren, StopAtSemi))
1510 break;
1511 } else {
1512 break;
1513 }
1514 }
1515
1516 if (Tok.isOneOf(tok::l_brace, tok::colon))
1517 TUK = Sema::TUK_Definition;
1518 else
1519 TUK = Sema::TUK_Reference;
1520
1521 PA.Revert();
1522 } else if (!isTypeSpecifier(DSC) &&
1523 (Tok.is(tok::semi) ||
1524 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1525 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1526 if (Tok.isNot(tok::semi)) {
1527 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1528 // A semicolon was missing after this declaration. Diagnose and recover.
1529 ExpectAndConsume(tok::semi, diag::err_expected_after,
1530 DeclSpec::getSpecifierName(TagType, PPol));
1531 PP.EnterToken(Tok);
1532 Tok.setKind(tok::semi);
1533 }
1534 } else
1535 TUK = Sema::TUK_Reference;
1536
1537 // Forbid misplaced attributes. In cases of a reference, we pass attributes
1538 // to caller to handle.
1539 if (TUK != Sema::TUK_Reference) {
1540 // If this is not a reference, then the only possible
1541 // valid place for C++11 attributes to appear here
1542 // is between class-key and class-name. If there are
1543 // any attributes after class-name, we try a fixit to move
1544 // them to the right place.
1545 SourceRange AttrRange = Attributes.Range;
1546 if (AttrRange.isValid()) {
1547 Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
1548 << AttrRange
1549 << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
1550 CharSourceRange(AttrRange, true))
1551 << FixItHint::CreateRemoval(AttrRange);
1552
1553 // Recover by adding misplaced attributes to the attribute list
1554 // of the class so they can be applied on the class later.
1555 attrs.takeAllFrom(Attributes);
1556 }
1557 }
1558
1559 // If this is an elaborated type specifier, and we delayed
1560 // diagnostics before, just merge them into the current pool.
1561 if (shouldDelayDiagsInTag) {
1562 diagsFromTag.done();
1563 if (TUK == Sema::TUK_Reference)
1564 diagsFromTag.redelay();
1565 }
1566
1567 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1568 TUK != Sema::TUK_Definition)) {
1569 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1570 // We have a declaration or reference to an anonymous class.
1571 Diag(StartLoc, diag::err_anon_type_definition)
1572 << DeclSpec::getSpecifierName(TagType, Policy);
1573 }
1574
1575 // If we are parsing a definition and stop at a base-clause, continue on
1576 // until the semicolon. Continuing from the comma will just trick us into
1577 // thinking we are seeing a variable declaration.
1578 if (TUK == Sema::TUK_Definition && Tok.is(tok::colon))
1579 SkipUntil(tok::semi, StopBeforeMatch);
1580 else
1581 SkipUntil(tok::comma, StopAtSemi);
1582 return;
1583 }
1584
1585 // Create the tag portion of the class or class template.
1586 DeclResult TagOrTempResult = true; // invalid
1587 TypeResult TypeResult = true; // invalid
1588
1589 bool Owned = false;
1590 Sema::SkipBodyInfo SkipBody;
1591 if (TemplateId) {
1592 // Explicit specialization, class template partial specialization,
1593 // or explicit instantiation.
1594 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1595 TemplateId->NumArgs);
1596 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1597 TUK == Sema::TUK_Declaration) {
1598 // This is an explicit instantiation of a class template.
1599 ProhibitAttributes(attrs);
1600
1601 TagOrTempResult
1602 = Actions.ActOnExplicitInstantiation(getCurScope(),
1603 TemplateInfo.ExternLoc,
1604 TemplateInfo.TemplateLoc,
1605 TagType,
1606 StartLoc,
1607 SS,
1608 TemplateId->Template,
1609 TemplateId->TemplateNameLoc,
1610 TemplateId->LAngleLoc,
1611 TemplateArgsPtr,
1612 TemplateId->RAngleLoc,
1613 attrs.getList());
1614
1615 // Friend template-ids are treated as references unless
1616 // they have template headers, in which case they're ill-formed
1617 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1618 // We diagnose this error in ActOnClassTemplateSpecialization.
1619 } else if (TUK == Sema::TUK_Reference ||
1620 (TUK == Sema::TUK_Friend &&
1621 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1622 ProhibitAttributes(attrs);
1623 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1624 TemplateId->SS,
1625 TemplateId->TemplateKWLoc,
1626 TemplateId->Template,
1627 TemplateId->TemplateNameLoc,
1628 TemplateId->LAngleLoc,
1629 TemplateArgsPtr,
1630 TemplateId->RAngleLoc);
1631 } else {
1632 // This is an explicit specialization or a class template
1633 // partial specialization.
1634 TemplateParameterLists FakedParamLists;
1635 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1636 // This looks like an explicit instantiation, because we have
1637 // something like
1638 //
1639 // template class Foo<X>
1640 //
1641 // but it actually has a definition. Most likely, this was
1642 // meant to be an explicit specialization, but the user forgot
1643 // the '<>' after 'template'.
1644 // It this is friend declaration however, since it cannot have a
1645 // template header, it is most likely that the user meant to
1646 // remove the 'template' keyword.
1647 assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&
1648 "Expected a definition here");
1649
1650 if (TUK == Sema::TUK_Friend) {
1651 Diag(DS.getFriendSpecLoc(), diag::err_friend_explicit_instantiation);
1652 TemplateParams = nullptr;
1653 } else {
1654 SourceLocation LAngleLoc =
1655 PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1656 Diag(TemplateId->TemplateNameLoc,
1657 diag::err_explicit_instantiation_with_definition)
1658 << SourceRange(TemplateInfo.TemplateLoc)
1659 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1660
1661 // Create a fake template parameter list that contains only
1662 // "template<>", so that we treat this construct as a class
1663 // template specialization.
1664 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
1665 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, nullptr,
1666 0, LAngleLoc));
1667 TemplateParams = &FakedParamLists;
1668 }
1669 }
1670
1671 // Build the class template specialization.
1672 TagOrTempResult = Actions.ActOnClassTemplateSpecialization(
1673 getCurScope(), TagType, TUK, StartLoc, DS.getModulePrivateSpecLoc(),
1674 *TemplateId, attrs.getList(),
1675 MultiTemplateParamsArg(TemplateParams ? &(*TemplateParams)[0]
1676 : nullptr,
1677 TemplateParams ? TemplateParams->size() : 0),
1678 &SkipBody);
1679 }
1680 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1681 TUK == Sema::TUK_Declaration) {
1682 // Explicit instantiation of a member of a class template
1683 // specialization, e.g.,
1684 //
1685 // template struct Outer<int>::Inner;
1686 //
1687 ProhibitAttributes(attrs);
1688
1689 TagOrTempResult
1690 = Actions.ActOnExplicitInstantiation(getCurScope(),
1691 TemplateInfo.ExternLoc,
1692 TemplateInfo.TemplateLoc,
1693 TagType, StartLoc, SS, Name,
1694 NameLoc, attrs.getList());
1695 } else if (TUK == Sema::TUK_Friend &&
1696 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1697 ProhibitAttributes(attrs);
1698
1699 TagOrTempResult =
1700 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1701 TagType, StartLoc, SS,
1702 Name, NameLoc, attrs.getList(),
1703 MultiTemplateParamsArg(
1704 TemplateParams? &(*TemplateParams)[0]
1705 : nullptr,
1706 TemplateParams? TemplateParams->size() : 0));
1707 } else {
1708 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1709 ProhibitAttributes(attrs);
1710
1711 if (TUK == Sema::TUK_Definition &&
1712 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1713 // If the declarator-id is not a template-id, issue a diagnostic and
1714 // recover by ignoring the 'template' keyword.
1715 Diag(Tok, diag::err_template_defn_explicit_instantiation)
1716 << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
1717 TemplateParams = nullptr;
1718 }
1719
1720 bool IsDependent = false;
1721
1722 // Don't pass down template parameter lists if this is just a tag
1723 // reference. For example, we don't need the template parameters here:
1724 // template <class T> class A *makeA(T t);
1725 MultiTemplateParamsArg TParams;
1726 if (TUK != Sema::TUK_Reference && TemplateParams)
1727 TParams =
1728 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1729
1730 handleDeclspecAlignBeforeClassKey(attrs, DS, TUK);
1731
1732 // Declaration or definition of a class type
1733 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1734 SS, Name, NameLoc, attrs.getList(), AS,
1735 DS.getModulePrivateSpecLoc(),
1736 TParams, Owned, IsDependent,
1737 SourceLocation(), false,
1738 clang::TypeResult(),
1739 DSC == DSC_type_specifier,
1740 &SkipBody);
1741
1742 // If ActOnTag said the type was dependent, try again with the
1743 // less common call.
1744 if (IsDependent) {
1745 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1746 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1747 SS, Name, StartLoc, NameLoc);
1748 }
1749 }
1750
1751 // If there is a body, parse it and inform the actions module.
1752 if (TUK == Sema::TUK_Definition) {
1753 assert(Tok.is(tok::l_brace) ||
1754 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1755 isCXX11FinalKeyword());
1756 if (SkipBody.ShouldSkip)
1757 SkipCXXMemberSpecification(StartLoc, AttrFixitLoc, TagType,
1758 TagOrTempResult.get());
1759 else if (getLangOpts().CPlusPlus)
1760 ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
1761 TagOrTempResult.get());
1762 else
1763 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1764 }
1765
1766 const char *PrevSpec = nullptr;
1767 unsigned DiagID;
1768 bool Result;
1769 if (!TypeResult.isInvalid()) {
1770 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1771 NameLoc.isValid() ? NameLoc : StartLoc,
1772 PrevSpec, DiagID, TypeResult.get(), Policy);
1773 } else if (!TagOrTempResult.isInvalid()) {
1774 Result = DS.SetTypeSpecType(TagType, StartLoc,
1775 NameLoc.isValid() ? NameLoc : StartLoc,
1776 PrevSpec, DiagID, TagOrTempResult.get(), Owned,
1777 Policy);
1778 } else {
1779 DS.SetTypeSpecError();
1780 return;
1781 }
1782
1783 if (Result)
1784 Diag(StartLoc, DiagID) << PrevSpec;
1785
1786 // At this point, we've successfully parsed a class-specifier in 'definition'
1787 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1788 // going to look at what comes after it to improve error recovery. If an
1789 // impossible token occurs next, we assume that the programmer forgot a ; at
1790 // the end of the declaration and recover that way.
1791 //
1792 // Also enforce C++ [temp]p3:
1793 // In a template-declaration which defines a class, no declarator
1794 // is permitted.
1795 //
1796 // After a type-specifier, we don't expect a semicolon. This only happens in
1797 // C, since definitions are not permitted in this context in C++.
1798 if (TUK == Sema::TUK_Definition &&
1799 (getLangOpts().CPlusPlus || !isTypeSpecifier(DSC)) &&
1800 (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
1801 if (Tok.isNot(tok::semi)) {
1802 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
1803 ExpectAndConsume(tok::semi, diag::err_expected_after,
1804 DeclSpec::getSpecifierName(TagType, PPol));
1805 // Push this token back into the preprocessor and change our current token
1806 // to ';' so that the rest of the code recovers as though there were an
1807 // ';' after the definition.
1808 PP.EnterToken(Tok);
1809 Tok.setKind(tok::semi);
1810 }
1811 }
1812 }
1813
1814 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1815 ///
1816 /// base-clause : [C++ class.derived]
1817 /// ':' base-specifier-list
1818 /// base-specifier-list:
1819 /// base-specifier '...'[opt]
1820 /// base-specifier-list ',' base-specifier '...'[opt]
ParseBaseClause(Decl * ClassDecl)1821 void Parser::ParseBaseClause(Decl *ClassDecl) {
1822 assert(Tok.is(tok::colon) && "Not a base clause");
1823 ConsumeToken();
1824
1825 // Build up an array of parsed base specifiers.
1826 SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1827
1828 while (true) {
1829 // Parse a base-specifier.
1830 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1831 if (Result.isInvalid()) {
1832 // Skip the rest of this base specifier, up until the comma or
1833 // opening brace.
1834 SkipUntil(tok::comma, tok::l_brace, StopAtSemi | StopBeforeMatch);
1835 } else {
1836 // Add this to our array of base specifiers.
1837 BaseInfo.push_back(Result.get());
1838 }
1839
1840 // If the next token is a comma, consume it and keep reading
1841 // base-specifiers.
1842 if (!TryConsumeToken(tok::comma))
1843 break;
1844 }
1845
1846 // Attach the base specifiers
1847 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1848 }
1849
1850 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1851 /// one entry in the base class list of a class specifier, for example:
1852 /// class foo : public bar, virtual private baz {
1853 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1854 ///
1855 /// base-specifier: [C++ class.derived]
1856 /// attribute-specifier-seq[opt] base-type-specifier
1857 /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
1858 /// base-type-specifier
1859 /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
1860 /// base-type-specifier
ParseBaseSpecifier(Decl * ClassDecl)1861 BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1862 bool IsVirtual = false;
1863 SourceLocation StartLoc = Tok.getLocation();
1864
1865 ParsedAttributesWithRange Attributes(AttrFactory);
1866 MaybeParseCXX11Attributes(Attributes);
1867
1868 // Parse the 'virtual' keyword.
1869 if (TryConsumeToken(tok::kw_virtual))
1870 IsVirtual = true;
1871
1872 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1873
1874 // Parse an (optional) access specifier.
1875 AccessSpecifier Access = getAccessSpecifierIfPresent();
1876 if (Access != AS_none)
1877 ConsumeToken();
1878
1879 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1880
1881 // Parse the 'virtual' keyword (again!), in case it came after the
1882 // access specifier.
1883 if (Tok.is(tok::kw_virtual)) {
1884 SourceLocation VirtualLoc = ConsumeToken();
1885 if (IsVirtual) {
1886 // Complain about duplicate 'virtual'
1887 Diag(VirtualLoc, diag::err_dup_virtual)
1888 << FixItHint::CreateRemoval(VirtualLoc);
1889 }
1890
1891 IsVirtual = true;
1892 }
1893
1894 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1895
1896 // Parse the class-name.
1897
1898 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
1899 // implementation for VS2013 uses _Atomic as an identifier for one of the
1900 // classes in <atomic>. Treat '_Atomic' to be an identifier when we are
1901 // parsing the class-name for a base specifier.
1902 if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
1903 NextToken().is(tok::less))
1904 Tok.setKind(tok::identifier);
1905
1906 SourceLocation EndLocation;
1907 SourceLocation BaseLoc;
1908 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
1909 if (BaseType.isInvalid())
1910 return true;
1911
1912 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1913 // actually part of the base-specifier-list grammar productions, but we
1914 // parse it here for convenience.
1915 SourceLocation EllipsisLoc;
1916 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1917
1918 // Find the complete source range for the base-specifier.
1919 SourceRange Range(StartLoc, EndLocation);
1920
1921 // Notify semantic analysis that we have parsed a complete
1922 // base-specifier.
1923 return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
1924 Access, BaseType.get(), BaseLoc,
1925 EllipsisLoc);
1926 }
1927
1928 /// getAccessSpecifierIfPresent - Determine whether the next token is
1929 /// a C++ access-specifier.
1930 ///
1931 /// access-specifier: [C++ class.derived]
1932 /// 'private'
1933 /// 'protected'
1934 /// 'public'
getAccessSpecifierIfPresent() const1935 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1936 switch (Tok.getKind()) {
1937 default: return AS_none;
1938 case tok::kw_private: return AS_private;
1939 case tok::kw_protected: return AS_protected;
1940 case tok::kw_public: return AS_public;
1941 }
1942 }
1943
1944 /// \brief If the given declarator has any parts for which parsing has to be
1945 /// delayed, e.g., default arguments or an exception-specification, create a
1946 /// late-parsed method declaration record to handle the parsing at the end of
1947 /// the class definition.
HandleMemberFunctionDeclDelays(Declarator & DeclaratorInfo,Decl * ThisDecl)1948 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
1949 Decl *ThisDecl) {
1950 DeclaratorChunk::FunctionTypeInfo &FTI
1951 = DeclaratorInfo.getFunctionTypeInfo();
1952 // If there was a late-parsed exception-specification, we'll need a
1953 // late parse
1954 bool NeedLateParse = FTI.getExceptionSpecType() == EST_Unparsed;
1955
1956 if (!NeedLateParse) {
1957 // Look ahead to see if there are any default args
1958 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx) {
1959 auto Param = cast<ParmVarDecl>(FTI.Params[ParamIdx].Param);
1960 if (Param->hasUnparsedDefaultArg()) {
1961 NeedLateParse = true;
1962 break;
1963 }
1964 }
1965 }
1966
1967 if (NeedLateParse) {
1968 // Push this method onto the stack of late-parsed method
1969 // declarations.
1970 auto LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1971 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1972 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1973
1974 // Stash the exception-specification tokens in the late-pased method.
1975 LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
1976 FTI.ExceptionSpecTokens = nullptr;
1977
1978 // Push tokens for each parameter. Those that do not have
1979 // defaults will be NULL.
1980 LateMethod->DefaultArgs.reserve(FTI.NumParams);
1981 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumParams; ++ParamIdx)
1982 LateMethod->DefaultArgs.push_back(LateParsedDefaultArgument(
1983 FTI.Params[ParamIdx].Param, FTI.Params[ParamIdx].DefaultArgTokens));
1984 }
1985 }
1986
1987 /// isCXX11VirtSpecifier - Determine whether the given token is a C++11
1988 /// virt-specifier.
1989 ///
1990 /// virt-specifier:
1991 /// override
1992 /// final
isCXX11VirtSpecifier(const Token & Tok) const1993 VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
1994 if (!getLangOpts().CPlusPlus || Tok.isNot(tok::identifier))
1995 return VirtSpecifiers::VS_None;
1996
1997 IdentifierInfo *II = Tok.getIdentifierInfo();
1998
1999 // Initialize the contextual keywords.
2000 if (!Ident_final) {
2001 Ident_final = &PP.getIdentifierTable().get("final");
2002 if (getLangOpts().MicrosoftExt)
2003 Ident_sealed = &PP.getIdentifierTable().get("sealed");
2004 Ident_override = &PP.getIdentifierTable().get("override");
2005 }
2006
2007 if (II == Ident_override)
2008 return VirtSpecifiers::VS_Override;
2009
2010 if (II == Ident_sealed)
2011 return VirtSpecifiers::VS_Sealed;
2012
2013 if (II == Ident_final)
2014 return VirtSpecifiers::VS_Final;
2015
2016 return VirtSpecifiers::VS_None;
2017 }
2018
2019 /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
2020 ///
2021 /// virt-specifier-seq:
2022 /// virt-specifier
2023 /// virt-specifier-seq virt-specifier
ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers & VS,bool IsInterface,SourceLocation FriendLoc)2024 void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
2025 bool IsInterface,
2026 SourceLocation FriendLoc) {
2027 while (true) {
2028 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2029 if (Specifier == VirtSpecifiers::VS_None)
2030 return;
2031
2032 if (FriendLoc.isValid()) {
2033 Diag(Tok.getLocation(), diag::err_friend_decl_spec)
2034 << VirtSpecifiers::getSpecifierName(Specifier)
2035 << FixItHint::CreateRemoval(Tok.getLocation())
2036 << SourceRange(FriendLoc, FriendLoc);
2037 ConsumeToken();
2038 continue;
2039 }
2040
2041 // C++ [class.mem]p8:
2042 // A virt-specifier-seq shall contain at most one of each virt-specifier.
2043 const char *PrevSpec = nullptr;
2044 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
2045 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
2046 << PrevSpec
2047 << FixItHint::CreateRemoval(Tok.getLocation());
2048
2049 if (IsInterface && (Specifier == VirtSpecifiers::VS_Final ||
2050 Specifier == VirtSpecifiers::VS_Sealed)) {
2051 Diag(Tok.getLocation(), diag::err_override_control_interface)
2052 << VirtSpecifiers::getSpecifierName(Specifier);
2053 } else if (Specifier == VirtSpecifiers::VS_Sealed) {
2054 Diag(Tok.getLocation(), diag::ext_ms_sealed_keyword);
2055 } else {
2056 Diag(Tok.getLocation(),
2057 getLangOpts().CPlusPlus11
2058 ? diag::warn_cxx98_compat_override_control_keyword
2059 : diag::ext_override_control_keyword)
2060 << VirtSpecifiers::getSpecifierName(Specifier);
2061 }
2062 ConsumeToken();
2063 }
2064 }
2065
2066 /// isCXX11FinalKeyword - Determine whether the next token is a C++11
2067 /// 'final' or Microsoft 'sealed' contextual keyword.
isCXX11FinalKeyword() const2068 bool Parser::isCXX11FinalKeyword() const {
2069 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
2070 return Specifier == VirtSpecifiers::VS_Final ||
2071 Specifier == VirtSpecifiers::VS_Sealed;
2072 }
2073
2074 /// \brief Parse a C++ member-declarator up to, but not including, the optional
2075 /// brace-or-equal-initializer or pure-specifier.
ParseCXXMemberDeclaratorBeforeInitializer(Declarator & DeclaratorInfo,VirtSpecifiers & VS,ExprResult & BitfieldSize,LateParsedAttrList & LateParsedAttrs)2076 bool Parser::ParseCXXMemberDeclaratorBeforeInitializer(
2077 Declarator &DeclaratorInfo, VirtSpecifiers &VS, ExprResult &BitfieldSize,
2078 LateParsedAttrList &LateParsedAttrs) {
2079 // member-declarator:
2080 // declarator pure-specifier[opt]
2081 // declarator brace-or-equal-initializer[opt]
2082 // identifier[opt] ':' constant-expression
2083 if (Tok.isNot(tok::colon))
2084 ParseDeclarator(DeclaratorInfo);
2085 else
2086 DeclaratorInfo.SetIdentifier(nullptr, Tok.getLocation());
2087
2088 if (!DeclaratorInfo.isFunctionDeclarator() && TryConsumeToken(tok::colon)) {
2089 assert(DeclaratorInfo.isPastIdentifier() &&
2090 "don't know where identifier would go yet?");
2091 BitfieldSize = ParseConstantExpression();
2092 if (BitfieldSize.isInvalid())
2093 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2094 } else {
2095 ParseOptionalCXX11VirtSpecifierSeq(
2096 VS, getCurrentClass().IsInterface,
2097 DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2098 if (!VS.isUnset())
2099 MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2100 }
2101
2102 // If a simple-asm-expr is present, parse it.
2103 if (Tok.is(tok::kw_asm)) {
2104 SourceLocation Loc;
2105 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2106 if (AsmLabel.isInvalid())
2107 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2108
2109 DeclaratorInfo.setAsmLabel(AsmLabel.get());
2110 DeclaratorInfo.SetRangeEnd(Loc);
2111 }
2112
2113 // If attributes exist after the declarator, but before an '{', parse them.
2114 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2115
2116 // For compatibility with code written to older Clang, also accept a
2117 // virt-specifier *after* the GNU attributes.
2118 if (BitfieldSize.isUnset() && VS.isUnset()) {
2119 ParseOptionalCXX11VirtSpecifierSeq(
2120 VS, getCurrentClass().IsInterface,
2121 DeclaratorInfo.getDeclSpec().getFriendSpecLoc());
2122 if (!VS.isUnset()) {
2123 // If we saw any GNU-style attributes that are known to GCC followed by a
2124 // virt-specifier, issue a GCC-compat warning.
2125 const AttributeList *Attr = DeclaratorInfo.getAttributes();
2126 while (Attr) {
2127 if (Attr->isKnownToGCC() && !Attr->isCXX11Attribute())
2128 Diag(Attr->getLoc(), diag::warn_gcc_attribute_location);
2129 Attr = Attr->getNext();
2130 }
2131 MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(DeclaratorInfo, VS);
2132 }
2133 }
2134
2135 // If this has neither a name nor a bit width, something has gone seriously
2136 // wrong. Skip until the semi-colon or }.
2137 if (!DeclaratorInfo.hasName() && BitfieldSize.isUnset()) {
2138 // If so, skip until the semi-colon or a }.
2139 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2140 return true;
2141 }
2142 return false;
2143 }
2144
2145 /// \brief Look for declaration specifiers possibly occurring after C++11
2146 /// virt-specifier-seq and diagnose them.
MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(Declarator & D,VirtSpecifiers & VS)2147 void Parser::MaybeParseAndDiagnoseDeclSpecAfterCXX11VirtSpecifierSeq(
2148 Declarator &D,
2149 VirtSpecifiers &VS) {
2150 DeclSpec DS(AttrFactory);
2151
2152 // GNU-style and C++11 attributes are not allowed here, but they will be
2153 // handled by the caller. Diagnose everything else.
2154 ParseTypeQualifierListOpt(DS, AR_NoAttributesParsed, false);
2155 D.ExtendWithDeclSpec(DS);
2156
2157 if (D.isFunctionDeclarator()) {
2158 auto &Function = D.getFunctionTypeInfo();
2159 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
2160 auto DeclSpecCheck = [&] (DeclSpec::TQ TypeQual,
2161 const char *FixItName,
2162 SourceLocation SpecLoc,
2163 unsigned* QualifierLoc) {
2164 FixItHint Insertion;
2165 if (DS.getTypeQualifiers() & TypeQual) {
2166 if (!(Function.TypeQuals & TypeQual)) {
2167 std::string Name(FixItName);
2168 Name += " ";
2169 Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name.c_str());
2170 Function.TypeQuals |= TypeQual;
2171 *QualifierLoc = SpecLoc.getRawEncoding();
2172 }
2173 Diag(SpecLoc, diag::err_declspec_after_virtspec)
2174 << FixItName
2175 << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
2176 << FixItHint::CreateRemoval(SpecLoc)
2177 << Insertion;
2178 }
2179 };
2180 DeclSpecCheck(DeclSpec::TQ_const, "const", DS.getConstSpecLoc(),
2181 &Function.ConstQualifierLoc);
2182 DeclSpecCheck(DeclSpec::TQ_volatile, "volatile", DS.getVolatileSpecLoc(),
2183 &Function.VolatileQualifierLoc);
2184 DeclSpecCheck(DeclSpec::TQ_restrict, "restrict", DS.getRestrictSpecLoc(),
2185 &Function.RestrictQualifierLoc);
2186 }
2187
2188 // Parse ref-qualifiers.
2189 bool RefQualifierIsLValueRef = true;
2190 SourceLocation RefQualifierLoc;
2191 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) {
2192 const char *Name = (RefQualifierIsLValueRef ? "& " : "&& ");
2193 FixItHint Insertion = FixItHint::CreateInsertion(VS.getFirstLocation(), Name);
2194 Function.RefQualifierIsLValueRef = RefQualifierIsLValueRef;
2195 Function.RefQualifierLoc = RefQualifierLoc.getRawEncoding();
2196
2197 Diag(RefQualifierLoc, diag::err_declspec_after_virtspec)
2198 << (RefQualifierIsLValueRef ? "&" : "&&")
2199 << VirtSpecifiers::getSpecifierName(VS.getLastSpecifier())
2200 << FixItHint::CreateRemoval(RefQualifierLoc)
2201 << Insertion;
2202 D.SetRangeEnd(RefQualifierLoc);
2203 }
2204 }
2205 }
2206
2207 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
2208 ///
2209 /// member-declaration:
2210 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
2211 /// function-definition ';'[opt]
2212 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
2213 /// using-declaration [TODO]
2214 /// [C++0x] static_assert-declaration
2215 /// template-declaration
2216 /// [GNU] '__extension__' member-declaration
2217 ///
2218 /// member-declarator-list:
2219 /// member-declarator
2220 /// member-declarator-list ',' member-declarator
2221 ///
2222 /// member-declarator:
2223 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
2224 /// declarator constant-initializer[opt]
2225 /// [C++11] declarator brace-or-equal-initializer[opt]
2226 /// identifier[opt] ':' constant-expression
2227 ///
2228 /// virt-specifier-seq:
2229 /// virt-specifier
2230 /// virt-specifier-seq virt-specifier
2231 ///
2232 /// virt-specifier:
2233 /// override
2234 /// final
2235 /// [MS] sealed
2236 ///
2237 /// pure-specifier:
2238 /// '= 0'
2239 ///
2240 /// constant-initializer:
2241 /// '=' constant-expression
2242 ///
2243 Parser::DeclGroupPtrTy
ParseCXXClassMemberDeclaration(AccessSpecifier AS,AttributeList * AccessAttrs,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject * TemplateDiags)2244 Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
2245 AttributeList *AccessAttrs,
2246 const ParsedTemplateInfo &TemplateInfo,
2247 ParsingDeclRAIIObject *TemplateDiags) {
2248 if (Tok.is(tok::at)) {
2249 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
2250 Diag(Tok, diag::err_at_defs_cxx);
2251 else
2252 Diag(Tok, diag::err_at_in_class);
2253
2254 ConsumeToken();
2255 SkipUntil(tok::r_brace, StopAtSemi);
2256 return DeclGroupPtrTy();
2257 }
2258
2259 // Turn on colon protection early, while parsing declspec, although there is
2260 // nothing to protect there. It prevents from false errors if error recovery
2261 // incorrectly determines where the declspec ends, as in the example:
2262 // struct A { enum class B { C }; };
2263 // const int C = 4;
2264 // struct D { A::B : C; };
2265 ColonProtectionRAIIObject X(*this);
2266
2267 // Access declarations.
2268 bool MalformedTypeSpec = false;
2269 if (!TemplateInfo.Kind &&
2270 Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
2271 if (TryAnnotateCXXScopeToken())
2272 MalformedTypeSpec = true;
2273
2274 bool isAccessDecl;
2275 if (Tok.isNot(tok::annot_cxxscope))
2276 isAccessDecl = false;
2277 else if (NextToken().is(tok::identifier))
2278 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
2279 else
2280 isAccessDecl = NextToken().is(tok::kw_operator);
2281
2282 if (isAccessDecl) {
2283 // Collect the scope specifier token we annotated earlier.
2284 CXXScopeSpec SS;
2285 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
2286 /*EnteringContext=*/false);
2287
2288 if (SS.isInvalid()) {
2289 SkipUntil(tok::semi);
2290 return DeclGroupPtrTy();
2291 }
2292
2293 // Try to parse an unqualified-id.
2294 SourceLocation TemplateKWLoc;
2295 UnqualifiedId Name;
2296 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(),
2297 TemplateKWLoc, Name)) {
2298 SkipUntil(tok::semi);
2299 return DeclGroupPtrTy();
2300 }
2301
2302 // TODO: recover from mistakenly-qualified operator declarations.
2303 if (ExpectAndConsume(tok::semi, diag::err_expected_after,
2304 "access declaration")) {
2305 SkipUntil(tok::semi);
2306 return DeclGroupPtrTy();
2307 }
2308
2309 return DeclGroupPtrTy::make(DeclGroupRef(Actions.ActOnUsingDeclaration(
2310 getCurScope(), AS,
2311 /* HasUsingKeyword */ false, SourceLocation(), SS, Name,
2312 /* AttrList */ nullptr,
2313 /* HasTypenameKeyword */ false, SourceLocation())));
2314 }
2315 }
2316
2317 // static_assert-declaration. A templated static_assert declaration is
2318 // diagnosed in Parser::ParseSingleDeclarationAfterTemplate.
2319 if (!TemplateInfo.Kind &&
2320 Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert)) {
2321 SourceLocation DeclEnd;
2322 return DeclGroupPtrTy::make(
2323 DeclGroupRef(ParseStaticAssertDeclaration(DeclEnd)));
2324 }
2325
2326 if (Tok.is(tok::kw_template)) {
2327 assert(!TemplateInfo.TemplateParams &&
2328 "Nested template improperly parsed?");
2329 SourceLocation DeclEnd;
2330 return DeclGroupPtrTy::make(
2331 DeclGroupRef(ParseDeclarationStartingWithTemplate(
2332 Declarator::MemberContext, DeclEnd, AS, AccessAttrs)));
2333 }
2334
2335 // Handle: member-declaration ::= '__extension__' member-declaration
2336 if (Tok.is(tok::kw___extension__)) {
2337 // __extension__ silences extension warnings in the subexpression.
2338 ExtensionRAIIObject O(Diags); // Use RAII to do this.
2339 ConsumeToken();
2340 return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
2341 TemplateInfo, TemplateDiags);
2342 }
2343
2344 ParsedAttributesWithRange attrs(AttrFactory);
2345 ParsedAttributesWithRange FnAttrs(AttrFactory);
2346 // Optional C++11 attribute-specifier
2347 MaybeParseCXX11Attributes(attrs);
2348 // We need to keep these attributes for future diagnostic
2349 // before they are taken over by declaration specifier.
2350 FnAttrs.addAll(attrs.getList());
2351 FnAttrs.Range = attrs.Range;
2352
2353 MaybeParseMicrosoftAttributes(attrs);
2354
2355 if (Tok.is(tok::kw_using)) {
2356 ProhibitAttributes(attrs);
2357
2358 // Eat 'using'.
2359 SourceLocation UsingLoc = ConsumeToken();
2360
2361 if (Tok.is(tok::kw_namespace)) {
2362 Diag(UsingLoc, diag::err_using_namespace_in_class);
2363 SkipUntil(tok::semi, StopBeforeMatch);
2364 return DeclGroupPtrTy();
2365 }
2366 SourceLocation DeclEnd;
2367 // Otherwise, it must be a using-declaration or an alias-declaration.
2368 return DeclGroupPtrTy::make(DeclGroupRef(ParseUsingDeclaration(
2369 Declarator::MemberContext, TemplateInfo, UsingLoc, DeclEnd, AS)));
2370 }
2371
2372 // Hold late-parsed attributes so we can attach a Decl to them later.
2373 LateParsedAttrList CommonLateParsedAttrs;
2374
2375 // decl-specifier-seq:
2376 // Parse the common declaration-specifiers piece.
2377 ParsingDeclSpec DS(*this, TemplateDiags);
2378 DS.takeAttributesFrom(attrs);
2379 if (MalformedTypeSpec)
2380 DS.SetTypeSpecError();
2381
2382 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class,
2383 &CommonLateParsedAttrs);
2384
2385 // Turn off colon protection that was set for declspec.
2386 X.restore();
2387
2388 // If we had a free-standing type definition with a missing semicolon, we
2389 // may get this far before the problem becomes obvious.
2390 if (DS.hasTagDefinition() &&
2391 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate &&
2392 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_class,
2393 &CommonLateParsedAttrs))
2394 return DeclGroupPtrTy();
2395
2396 MultiTemplateParamsArg TemplateParams(
2397 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data()
2398 : nullptr,
2399 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
2400
2401 if (TryConsumeToken(tok::semi)) {
2402 if (DS.isFriendSpecified())
2403 ProhibitAttributes(FnAttrs);
2404
2405 Decl *TheDecl =
2406 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
2407 DS.complete(TheDecl);
2408 return DeclGroupPtrTy::make(DeclGroupRef(TheDecl));
2409 }
2410
2411 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
2412 VirtSpecifiers VS;
2413
2414 // Hold late-parsed attributes so we can attach a Decl to them later.
2415 LateParsedAttrList LateParsedAttrs;
2416
2417 SourceLocation EqualLoc;
2418 SourceLocation PureSpecLoc;
2419
2420 auto TryConsumePureSpecifier = [&] (bool AllowDefinition) {
2421 if (Tok.isNot(tok::equal))
2422 return false;
2423
2424 auto &Zero = NextToken();
2425 SmallString<8> Buffer;
2426 if (Zero.isNot(tok::numeric_constant) || Zero.getLength() != 1 ||
2427 PP.getSpelling(Zero, Buffer) != "0")
2428 return false;
2429
2430 auto &After = GetLookAheadToken(2);
2431 if (!After.isOneOf(tok::semi, tok::comma) &&
2432 !(AllowDefinition &&
2433 After.isOneOf(tok::l_brace, tok::colon, tok::kw_try)))
2434 return false;
2435
2436 EqualLoc = ConsumeToken();
2437 PureSpecLoc = ConsumeToken();
2438 return true;
2439 };
2440
2441 SmallVector<Decl *, 8> DeclsInGroup;
2442 ExprResult BitfieldSize;
2443 bool ExpectSemi = true;
2444
2445 // Parse the first declarator.
2446 if (ParseCXXMemberDeclaratorBeforeInitializer(
2447 DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs)) {
2448 TryConsumeToken(tok::semi);
2449 return DeclGroupPtrTy();
2450 }
2451
2452 // Check for a member function definition.
2453 if (BitfieldSize.isUnset()) {
2454 // MSVC permits pure specifier on inline functions defined at class scope.
2455 // Hence check for =0 before checking for function definition.
2456 if (getLangOpts().MicrosoftExt && DeclaratorInfo.isDeclarationOfFunction())
2457 TryConsumePureSpecifier(/*AllowDefinition*/ true);
2458
2459 FunctionDefinitionKind DefinitionKind = FDK_Declaration;
2460 // function-definition:
2461 //
2462 // In C++11, a non-function declarator followed by an open brace is a
2463 // braced-init-list for an in-class member initialization, not an
2464 // erroneous function definition.
2465 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
2466 DefinitionKind = FDK_Definition;
2467 } else if (DeclaratorInfo.isFunctionDeclarator()) {
2468 if (Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try)) {
2469 DefinitionKind = FDK_Definition;
2470 } else if (Tok.is(tok::equal)) {
2471 const Token &KW = NextToken();
2472 if (KW.is(tok::kw_default))
2473 DefinitionKind = FDK_Defaulted;
2474 else if (KW.is(tok::kw_delete))
2475 DefinitionKind = FDK_Deleted;
2476 }
2477 }
2478 DeclaratorInfo.setFunctionDefinitionKind(DefinitionKind);
2479
2480 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2481 // to a friend declaration, that declaration shall be a definition.
2482 if (DeclaratorInfo.isFunctionDeclarator() &&
2483 DefinitionKind != FDK_Definition && DS.isFriendSpecified()) {
2484 // Diagnose attributes that appear before decl specifier:
2485 // [[]] friend int foo();
2486 ProhibitAttributes(FnAttrs);
2487 }
2488
2489 if (DefinitionKind != FDK_Declaration) {
2490 if (!DeclaratorInfo.isFunctionDeclarator()) {
2491 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
2492 ConsumeBrace();
2493 SkipUntil(tok::r_brace);
2494
2495 // Consume the optional ';'
2496 TryConsumeToken(tok::semi);
2497
2498 return DeclGroupPtrTy();
2499 }
2500
2501 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
2502 Diag(DeclaratorInfo.getIdentifierLoc(),
2503 diag::err_function_declared_typedef);
2504
2505 // Recover by treating the 'typedef' as spurious.
2506 DS.ClearStorageClassSpecs();
2507 }
2508
2509 Decl *FunDecl =
2510 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
2511 VS, PureSpecLoc);
2512
2513 if (FunDecl) {
2514 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2515 CommonLateParsedAttrs[i]->addDecl(FunDecl);
2516 }
2517 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2518 LateParsedAttrs[i]->addDecl(FunDecl);
2519 }
2520 }
2521 LateParsedAttrs.clear();
2522
2523 // Consume the ';' - it's optional unless we have a delete or default
2524 if (Tok.is(tok::semi))
2525 ConsumeExtraSemi(AfterMemberFunctionDefinition);
2526
2527 return DeclGroupPtrTy::make(DeclGroupRef(FunDecl));
2528 }
2529 }
2530
2531 // member-declarator-list:
2532 // member-declarator
2533 // member-declarator-list ',' member-declarator
2534
2535 while (1) {
2536 InClassInitStyle HasInClassInit = ICIS_NoInit;
2537 bool HasStaticInitializer = false;
2538 if (Tok.isOneOf(tok::equal, tok::l_brace) && PureSpecLoc.isInvalid()) {
2539 if (BitfieldSize.get()) {
2540 Diag(Tok, diag::err_bitfield_member_init);
2541 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2542 } else if (DeclaratorInfo.isDeclarationOfFunction()) {
2543 // It's a pure-specifier.
2544 if (!TryConsumePureSpecifier(/*AllowFunctionDefinition*/ false))
2545 // Parse it as an expression so that Sema can diagnose it.
2546 HasStaticInitializer = true;
2547 } else if (DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2548 DeclSpec::SCS_static &&
2549 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2550 DeclSpec::SCS_typedef &&
2551 !DS.isFriendSpecified()) {
2552 // It's a default member initializer.
2553 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2554 } else {
2555 HasStaticInitializer = true;
2556 }
2557 }
2558
2559 // NOTE: If Sema is the Action module and declarator is an instance field,
2560 // this call will *not* return the created decl; It will return null.
2561 // See Sema::ActOnCXXMemberDeclarator for details.
2562
2563 NamedDecl *ThisDecl = nullptr;
2564 if (DS.isFriendSpecified()) {
2565 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2566 // to a friend declaration, that declaration shall be a definition.
2567 //
2568 // Diagnose attributes that appear in a friend member function declarator:
2569 // friend int foo [[]] ();
2570 SmallVector<SourceRange, 4> Ranges;
2571 DeclaratorInfo.getCXX11AttributeRanges(Ranges);
2572 for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
2573 E = Ranges.end(); I != E; ++I)
2574 Diag((*I).getBegin(), diag::err_attributes_not_allowed) << *I;
2575
2576 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2577 TemplateParams);
2578 } else {
2579 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2580 DeclaratorInfo,
2581 TemplateParams,
2582 BitfieldSize.get(),
2583 VS, HasInClassInit);
2584
2585 if (VarTemplateDecl *VT =
2586 ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : nullptr)
2587 // Re-direct this decl to refer to the templated decl so that we can
2588 // initialize it.
2589 ThisDecl = VT->getTemplatedDecl();
2590
2591 if (ThisDecl && AccessAttrs)
2592 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs);
2593 }
2594
2595 // Error recovery might have converted a non-static member into a static
2596 // member.
2597 if (HasInClassInit != ICIS_NoInit &&
2598 DeclaratorInfo.getDeclSpec().getStorageClassSpec() ==
2599 DeclSpec::SCS_static) {
2600 HasInClassInit = ICIS_NoInit;
2601 HasStaticInitializer = true;
2602 }
2603
2604 if (ThisDecl && PureSpecLoc.isValid())
2605 Actions.ActOnPureSpecifier(ThisDecl, PureSpecLoc);
2606
2607 // Handle the initializer.
2608 if (HasInClassInit != ICIS_NoInit) {
2609 // The initializer was deferred; parse it and cache the tokens.
2610 Diag(Tok, getLangOpts().CPlusPlus11
2611 ? diag::warn_cxx98_compat_nonstatic_member_init
2612 : diag::ext_nonstatic_member_init);
2613
2614 if (DeclaratorInfo.isArrayOfUnknownBound()) {
2615 // C++11 [dcl.array]p3: An array bound may also be omitted when the
2616 // declarator is followed by an initializer.
2617 //
2618 // A brace-or-equal-initializer for a member-declarator is not an
2619 // initializer in the grammar, so this is ill-formed.
2620 Diag(Tok, diag::err_incomplete_array_member_init);
2621 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2622
2623 // Avoid later warnings about a class member of incomplete type.
2624 if (ThisDecl)
2625 ThisDecl->setInvalidDecl();
2626 } else
2627 ParseCXXNonStaticMemberInitializer(ThisDecl);
2628 } else if (HasStaticInitializer) {
2629 // Normal initializer.
2630 ExprResult Init = ParseCXXMemberInitializer(
2631 ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2632
2633 if (Init.isInvalid())
2634 SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
2635 else if (ThisDecl)
2636 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(),
2637 DS.containsPlaceholderType());
2638 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
2639 // No initializer.
2640 Actions.ActOnUninitializedDecl(ThisDecl, DS.containsPlaceholderType());
2641
2642 if (ThisDecl) {
2643 if (!ThisDecl->isInvalidDecl()) {
2644 // Set the Decl for any late parsed attributes
2645 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
2646 CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2647
2648 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
2649 LateParsedAttrs[i]->addDecl(ThisDecl);
2650 }
2651 Actions.FinalizeDeclaration(ThisDecl);
2652 DeclsInGroup.push_back(ThisDecl);
2653
2654 if (DeclaratorInfo.isFunctionDeclarator() &&
2655 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2656 DeclSpec::SCS_typedef)
2657 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2658 }
2659 LateParsedAttrs.clear();
2660
2661 DeclaratorInfo.complete(ThisDecl);
2662
2663 // If we don't have a comma, it is either the end of the list (a ';')
2664 // or an error, bail out.
2665 SourceLocation CommaLoc;
2666 if (!TryConsumeToken(tok::comma, CommaLoc))
2667 break;
2668
2669 if (Tok.isAtStartOfLine() &&
2670 !MightBeDeclarator(Declarator::MemberContext)) {
2671 // This comma was followed by a line-break and something which can't be
2672 // the start of a declarator. The comma was probably a typo for a
2673 // semicolon.
2674 Diag(CommaLoc, diag::err_expected_semi_declaration)
2675 << FixItHint::CreateReplacement(CommaLoc, ";");
2676 ExpectSemi = false;
2677 break;
2678 }
2679
2680 // Parse the next declarator.
2681 DeclaratorInfo.clear();
2682 VS.clear();
2683 BitfieldSize = ExprResult(/*Invalid=*/false);
2684 EqualLoc = PureSpecLoc = SourceLocation();
2685 DeclaratorInfo.setCommaLoc(CommaLoc);
2686
2687 // GNU attributes are allowed before the second and subsequent declarator.
2688 MaybeParseGNUAttributes(DeclaratorInfo);
2689
2690 if (ParseCXXMemberDeclaratorBeforeInitializer(
2691 DeclaratorInfo, VS, BitfieldSize, LateParsedAttrs))
2692 break;
2693 }
2694
2695 if (ExpectSemi &&
2696 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2697 // Skip to end of block or statement.
2698 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2699 // If we stopped at a ';', eat it.
2700 TryConsumeToken(tok::semi);
2701 return DeclGroupPtrTy();
2702 }
2703
2704 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2705 }
2706
2707 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer.
2708 /// Also detect and reject any attempted defaulted/deleted function definition.
2709 /// The location of the '=', if any, will be placed in EqualLoc.
2710 ///
2711 /// This does not check for a pure-specifier; that's handled elsewhere.
2712 ///
2713 /// brace-or-equal-initializer:
2714 /// '=' initializer-expression
2715 /// braced-init-list
2716 ///
2717 /// initializer-clause:
2718 /// assignment-expression
2719 /// braced-init-list
2720 ///
2721 /// defaulted/deleted function-definition:
2722 /// '=' 'default'
2723 /// '=' 'delete'
2724 ///
2725 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2726 /// be a constant-expression.
ParseCXXMemberInitializer(Decl * D,bool IsFunction,SourceLocation & EqualLoc)2727 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2728 SourceLocation &EqualLoc) {
2729 assert(Tok.isOneOf(tok::equal, tok::l_brace)
2730 && "Data member initializer not starting with '=' or '{'");
2731
2732 EnterExpressionEvaluationContext Context(Actions,
2733 Sema::PotentiallyEvaluated,
2734 D);
2735 if (TryConsumeToken(tok::equal, EqualLoc)) {
2736 if (Tok.is(tok::kw_delete)) {
2737 // In principle, an initializer of '= delete p;' is legal, but it will
2738 // never type-check. It's better to diagnose it as an ill-formed expression
2739 // than as an ill-formed deleted non-function member.
2740 // An initializer of '= delete p, foo' will never be parsed, because
2741 // a top-level comma always ends the initializer expression.
2742 const Token &Next = NextToken();
2743 if (IsFunction || Next.isOneOf(tok::semi, tok::comma, tok::eof)) {
2744 if (IsFunction)
2745 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2746 << 1 /* delete */;
2747 else
2748 Diag(ConsumeToken(), diag::err_deleted_non_function);
2749 return ExprError();
2750 }
2751 } else if (Tok.is(tok::kw_default)) {
2752 if (IsFunction)
2753 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2754 << 0 /* default */;
2755 else
2756 Diag(ConsumeToken(), diag::err_default_special_members);
2757 return ExprError();
2758 }
2759 }
2760 if (const auto *PD = dyn_cast_or_null<MSPropertyDecl>(D)) {
2761 Diag(Tok, diag::err_ms_property_initializer) << PD;
2762 return ExprError();
2763 }
2764 return ParseInitializer();
2765 }
2766
SkipCXXMemberSpecification(SourceLocation RecordLoc,SourceLocation AttrFixitLoc,unsigned TagType,Decl * TagDecl)2767 void Parser::SkipCXXMemberSpecification(SourceLocation RecordLoc,
2768 SourceLocation AttrFixitLoc,
2769 unsigned TagType, Decl *TagDecl) {
2770 // Skip the optional 'final' keyword.
2771 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2772 assert(isCXX11FinalKeyword() && "not a class definition");
2773 ConsumeToken();
2774
2775 // Diagnose any C++11 attributes after 'final' keyword.
2776 // We deliberately discard these attributes.
2777 ParsedAttributesWithRange Attrs(AttrFactory);
2778 CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
2779
2780 // This can only happen if we had malformed misplaced attributes;
2781 // we only get called if there is a colon or left-brace after the
2782 // attributes.
2783 if (Tok.isNot(tok::colon) && Tok.isNot(tok::l_brace))
2784 return;
2785 }
2786
2787 // Skip the base clauses. This requires actually parsing them, because
2788 // otherwise we can't be sure where they end (a left brace may appear
2789 // within a template argument).
2790 if (Tok.is(tok::colon)) {
2791 // Enter the scope of the class so that we can correctly parse its bases.
2792 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2793 ParsingClassDefinition ParsingDef(*this, TagDecl, /*NonNestedClass*/ true,
2794 TagType == DeclSpec::TST_interface);
2795 auto OldContext =
2796 Actions.ActOnTagStartSkippedDefinition(getCurScope(), TagDecl);
2797
2798 // Parse the bases but don't attach them to the class.
2799 ParseBaseClause(nullptr);
2800
2801 Actions.ActOnTagFinishSkippedDefinition(OldContext);
2802
2803 if (!Tok.is(tok::l_brace)) {
2804 Diag(PP.getLocForEndOfToken(PrevTokLocation),
2805 diag::err_expected_lbrace_after_base_specifiers);
2806 return;
2807 }
2808 }
2809
2810 // Skip the body.
2811 assert(Tok.is(tok::l_brace));
2812 BalancedDelimiterTracker T(*this, tok::l_brace);
2813 T.consumeOpen();
2814 T.skipToEnd();
2815
2816 // Parse and discard any trailing attributes.
2817 ParsedAttributes Attrs(AttrFactory);
2818 if (Tok.is(tok::kw___attribute))
2819 MaybeParseGNUAttributes(Attrs);
2820 }
2821
ParseCXXClassMemberDeclarationWithPragmas(AccessSpecifier & AS,ParsedAttributesWithRange & AccessAttrs,DeclSpec::TST TagType,Decl * TagDecl)2822 Parser::DeclGroupPtrTy Parser::ParseCXXClassMemberDeclarationWithPragmas(
2823 AccessSpecifier &AS, ParsedAttributesWithRange &AccessAttrs,
2824 DeclSpec::TST TagType, Decl *TagDecl) {
2825 if (getLangOpts().MicrosoftExt &&
2826 Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
2827 ParseMicrosoftIfExistsClassDeclaration(TagType, AS);
2828 return DeclGroupPtrTy();
2829 }
2830
2831 // Check for extraneous top-level semicolon.
2832 if (Tok.is(tok::semi)) {
2833 ConsumeExtraSemi(InsideStruct, TagType);
2834 return DeclGroupPtrTy();
2835 }
2836
2837 if (Tok.is(tok::annot_pragma_vis)) {
2838 HandlePragmaVisibility();
2839 return DeclGroupPtrTy();
2840 }
2841
2842 if (Tok.is(tok::annot_pragma_pack)) {
2843 HandlePragmaPack();
2844 return DeclGroupPtrTy();
2845 }
2846
2847 if (Tok.is(tok::annot_pragma_align)) {
2848 HandlePragmaAlign();
2849 return DeclGroupPtrTy();
2850 }
2851
2852 if (Tok.is(tok::annot_pragma_ms_pointers_to_members)) {
2853 HandlePragmaMSPointersToMembers();
2854 return DeclGroupPtrTy();
2855 }
2856
2857 if (Tok.is(tok::annot_pragma_ms_pragma)) {
2858 HandlePragmaMSPragma();
2859 return DeclGroupPtrTy();
2860 }
2861
2862 if (Tok.is(tok::annot_pragma_ms_vtordisp)) {
2863 HandlePragmaMSVtorDisp();
2864 return DeclGroupPtrTy();
2865 }
2866
2867 // If we see a namespace here, a close brace was missing somewhere.
2868 if (Tok.is(tok::kw_namespace)) {
2869 DiagnoseUnexpectedNamespace(cast<NamedDecl>(TagDecl));
2870 return DeclGroupPtrTy();
2871 }
2872
2873 AccessSpecifier NewAS = getAccessSpecifierIfPresent();
2874 if (NewAS != AS_none) {
2875 // Current token is a C++ access specifier.
2876 AS = NewAS;
2877 SourceLocation ASLoc = Tok.getLocation();
2878 unsigned TokLength = Tok.getLength();
2879 ConsumeToken();
2880 AccessAttrs.clear();
2881 MaybeParseGNUAttributes(AccessAttrs);
2882
2883 SourceLocation EndLoc;
2884 if (TryConsumeToken(tok::colon, EndLoc)) {
2885 } else if (TryConsumeToken(tok::semi, EndLoc)) {
2886 Diag(EndLoc, diag::err_expected)
2887 << tok::colon << FixItHint::CreateReplacement(EndLoc, ":");
2888 } else {
2889 EndLoc = ASLoc.getLocWithOffset(TokLength);
2890 Diag(EndLoc, diag::err_expected)
2891 << tok::colon << FixItHint::CreateInsertion(EndLoc, ":");
2892 }
2893
2894 // The Microsoft extension __interface does not permit non-public
2895 // access specifiers.
2896 if (TagType == DeclSpec::TST_interface && AS != AS_public) {
2897 Diag(ASLoc, diag::err_access_specifier_interface) << (AS == AS_protected);
2898 }
2899
2900 if (Actions.ActOnAccessSpecifier(NewAS, ASLoc, EndLoc,
2901 AccessAttrs.getList())) {
2902 // found another attribute than only annotations
2903 AccessAttrs.clear();
2904 }
2905
2906 return DeclGroupPtrTy();
2907 }
2908
2909 if (Tok.is(tok::annot_pragma_openmp))
2910 return ParseOpenMPDeclarativeDirective();
2911
2912 // Parse all the comma separated declarators.
2913 return ParseCXXClassMemberDeclaration(AS, AccessAttrs.getList());
2914 }
2915
2916 /// ParseCXXMemberSpecification - Parse the class definition.
2917 ///
2918 /// member-specification:
2919 /// member-declaration member-specification[opt]
2920 /// access-specifier ':' member-specification[opt]
2921 ///
ParseCXXMemberSpecification(SourceLocation RecordLoc,SourceLocation AttrFixitLoc,ParsedAttributesWithRange & Attrs,unsigned TagType,Decl * TagDecl)2922 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
2923 SourceLocation AttrFixitLoc,
2924 ParsedAttributesWithRange &Attrs,
2925 unsigned TagType, Decl *TagDecl) {
2926 assert((TagType == DeclSpec::TST_struct ||
2927 TagType == DeclSpec::TST_interface ||
2928 TagType == DeclSpec::TST_union ||
2929 TagType == DeclSpec::TST_class) && "Invalid TagType!");
2930
2931 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2932 "parsing struct/union/class body");
2933
2934 // Determine whether this is a non-nested class. Note that local
2935 // classes are *not* considered to be nested classes.
2936 bool NonNestedClass = true;
2937 if (!ClassStack.empty()) {
2938 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2939 if (S->isClassScope()) {
2940 // We're inside a class scope, so this is a nested class.
2941 NonNestedClass = false;
2942
2943 // The Microsoft extension __interface does not permit nested classes.
2944 if (getCurrentClass().IsInterface) {
2945 Diag(RecordLoc, diag::err_invalid_member_in_interface)
2946 << /*ErrorType=*/6
2947 << (isa<NamedDecl>(TagDecl)
2948 ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
2949 : "(anonymous)");
2950 }
2951 break;
2952 }
2953
2954 if ((S->getFlags() & Scope::FnScope))
2955 // If we're in a function or function template then this is a local
2956 // class rather than a nested class.
2957 break;
2958 }
2959 }
2960
2961 // Enter a scope for the class.
2962 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2963
2964 // Note that we are parsing a new (potentially-nested) class definition.
2965 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
2966 TagType == DeclSpec::TST_interface);
2967
2968 if (TagDecl)
2969 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2970
2971 SourceLocation FinalLoc;
2972 bool IsFinalSpelledSealed = false;
2973
2974 // Parse the optional 'final' keyword.
2975 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2976 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier(Tok);
2977 assert((Specifier == VirtSpecifiers::VS_Final ||
2978 Specifier == VirtSpecifiers::VS_Sealed) &&
2979 "not a class definition");
2980 FinalLoc = ConsumeToken();
2981 IsFinalSpelledSealed = Specifier == VirtSpecifiers::VS_Sealed;
2982
2983 if (TagType == DeclSpec::TST_interface)
2984 Diag(FinalLoc, diag::err_override_control_interface)
2985 << VirtSpecifiers::getSpecifierName(Specifier);
2986 else if (Specifier == VirtSpecifiers::VS_Final)
2987 Diag(FinalLoc, getLangOpts().CPlusPlus11
2988 ? diag::warn_cxx98_compat_override_control_keyword
2989 : diag::ext_override_control_keyword)
2990 << VirtSpecifiers::getSpecifierName(Specifier);
2991 else if (Specifier == VirtSpecifiers::VS_Sealed)
2992 Diag(FinalLoc, diag::ext_ms_sealed_keyword);
2993
2994 // Parse any C++11 attributes after 'final' keyword.
2995 // These attributes are not allowed to appear here,
2996 // and the only possible place for them to appertain
2997 // to the class would be between class-key and class-name.
2998 CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
2999
3000 // ParseClassSpecifier() does only a superficial check for attributes before
3001 // deciding to call this method. For example, for
3002 // `class C final alignas ([l) {` it will decide that this looks like a
3003 // misplaced attribute since it sees `alignas '(' ')'`. But the actual
3004 // attribute parsing code will try to parse the '[' as a constexpr lambda
3005 // and consume enough tokens that the alignas parsing code will eat the
3006 // opening '{'. So bail out if the next token isn't one we expect.
3007 if (!Tok.is(tok::colon) && !Tok.is(tok::l_brace)) {
3008 if (TagDecl)
3009 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3010 return;
3011 }
3012 }
3013
3014 if (Tok.is(tok::colon)) {
3015 ParseBaseClause(TagDecl);
3016 if (!Tok.is(tok::l_brace)) {
3017 bool SuggestFixIt = false;
3018 SourceLocation BraceLoc = PP.getLocForEndOfToken(PrevTokLocation);
3019 if (Tok.isAtStartOfLine()) {
3020 switch (Tok.getKind()) {
3021 case tok::kw_private:
3022 case tok::kw_protected:
3023 case tok::kw_public:
3024 SuggestFixIt = NextToken().getKind() == tok::colon;
3025 break;
3026 case tok::kw_static_assert:
3027 case tok::r_brace:
3028 case tok::kw_using:
3029 // base-clause can have simple-template-id; 'template' can't be there
3030 case tok::kw_template:
3031 SuggestFixIt = true;
3032 break;
3033 case tok::identifier:
3034 SuggestFixIt = isConstructorDeclarator(true);
3035 break;
3036 default:
3037 SuggestFixIt = isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false);
3038 break;
3039 }
3040 }
3041 DiagnosticBuilder LBraceDiag =
3042 Diag(BraceLoc, diag::err_expected_lbrace_after_base_specifiers);
3043 if (SuggestFixIt) {
3044 LBraceDiag << FixItHint::CreateInsertion(BraceLoc, " {");
3045 // Try recovering from missing { after base-clause.
3046 PP.EnterToken(Tok);
3047 Tok.setKind(tok::l_brace);
3048 } else {
3049 if (TagDecl)
3050 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
3051 return;
3052 }
3053 }
3054 }
3055
3056 assert(Tok.is(tok::l_brace));
3057 BalancedDelimiterTracker T(*this, tok::l_brace);
3058 T.consumeOpen();
3059
3060 if (TagDecl)
3061 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
3062 IsFinalSpelledSealed,
3063 T.getOpenLocation());
3064
3065 // C++ 11p3: Members of a class defined with the keyword class are private
3066 // by default. Members of a class defined with the keywords struct or union
3067 // are public by default.
3068 AccessSpecifier CurAS;
3069 if (TagType == DeclSpec::TST_class)
3070 CurAS = AS_private;
3071 else
3072 CurAS = AS_public;
3073 ParsedAttributesWithRange AccessAttrs(AttrFactory);
3074
3075 if (TagDecl) {
3076 // While we still have something to read, read the member-declarations.
3077 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
3078 Tok.isNot(tok::eof)) {
3079 // Each iteration of this loop reads one member-declaration.
3080 ParseCXXClassMemberDeclarationWithPragmas(
3081 CurAS, AccessAttrs, static_cast<DeclSpec::TST>(TagType), TagDecl);
3082 }
3083 T.consumeClose();
3084 } else {
3085 SkipUntil(tok::r_brace);
3086 }
3087
3088 // If attributes exist after class contents, parse them.
3089 ParsedAttributes attrs(AttrFactory);
3090 MaybeParseGNUAttributes(attrs);
3091
3092 if (TagDecl)
3093 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
3094 T.getOpenLocation(),
3095 T.getCloseLocation(),
3096 attrs.getList());
3097
3098 // C++11 [class.mem]p2:
3099 // Within the class member-specification, the class is regarded as complete
3100 // within function bodies, default arguments, exception-specifications, and
3101 // brace-or-equal-initializers for non-static data members (including such
3102 // things in nested classes).
3103 if (TagDecl && NonNestedClass) {
3104 // We are not inside a nested class. This class and its nested classes
3105 // are complete and we can parse the delayed portions of method
3106 // declarations and the lexed inline method definitions, along with any
3107 // delayed attributes.
3108 SourceLocation SavedPrevTokLocation = PrevTokLocation;
3109 ParseLexedAttributes(getCurrentClass());
3110 ParseLexedMethodDeclarations(getCurrentClass());
3111
3112 // We've finished with all pending member declarations.
3113 Actions.ActOnFinishCXXMemberDecls();
3114
3115 ParseLexedMemberInitializers(getCurrentClass());
3116 ParseLexedMethodDefs(getCurrentClass());
3117 PrevTokLocation = SavedPrevTokLocation;
3118
3119 // We've finished parsing everything, including default argument
3120 // initializers.
3121 Actions.ActOnFinishCXXNonNestedClass(TagDecl);
3122 }
3123
3124 if (TagDecl)
3125 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl,
3126 T.getCloseLocation());
3127
3128 // Leave the class scope.
3129 ParsingDef.Pop();
3130 ClassScope.Exit();
3131 }
3132
DiagnoseUnexpectedNamespace(NamedDecl * D)3133 void Parser::DiagnoseUnexpectedNamespace(NamedDecl *D) {
3134 assert(Tok.is(tok::kw_namespace));
3135
3136 // FIXME: Suggest where the close brace should have gone by looking
3137 // at indentation changes within the definition body.
3138 Diag(D->getLocation(),
3139 diag::err_missing_end_of_definition) << D;
3140 Diag(Tok.getLocation(),
3141 diag::note_missing_end_of_definition_before) << D;
3142
3143 // Push '};' onto the token stream to recover.
3144 PP.EnterToken(Tok);
3145
3146 Tok.startToken();
3147 Tok.setLocation(PP.getLocForEndOfToken(PrevTokLocation));
3148 Tok.setKind(tok::semi);
3149 PP.EnterToken(Tok);
3150
3151 Tok.setKind(tok::r_brace);
3152 }
3153
3154 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
3155 /// which explicitly initializes the members or base classes of a
3156 /// class (C++ [class.base.init]). For example, the three initializers
3157 /// after the ':' in the Derived constructor below:
3158 ///
3159 /// @code
3160 /// class Base { };
3161 /// class Derived : Base {
3162 /// int x;
3163 /// float f;
3164 /// public:
3165 /// Derived(float f) : Base(), x(17), f(f) { }
3166 /// };
3167 /// @endcode
3168 ///
3169 /// [C++] ctor-initializer:
3170 /// ':' mem-initializer-list
3171 ///
3172 /// [C++] mem-initializer-list:
3173 /// mem-initializer ...[opt]
3174 /// mem-initializer ...[opt] , mem-initializer-list
ParseConstructorInitializer(Decl * ConstructorDecl)3175 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
3176 assert(Tok.is(tok::colon) &&
3177 "Constructor initializer always starts with ':'");
3178
3179 // Poison the SEH identifiers so they are flagged as illegal in constructor
3180 // initializers.
3181 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
3182 SourceLocation ColonLoc = ConsumeToken();
3183
3184 SmallVector<CXXCtorInitializer*, 4> MemInitializers;
3185 bool AnyErrors = false;
3186
3187 do {
3188 if (Tok.is(tok::code_completion)) {
3189 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
3190 MemInitializers);
3191 return cutOffParsing();
3192 } else {
3193 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
3194 if (!MemInit.isInvalid())
3195 MemInitializers.push_back(MemInit.get());
3196 else
3197 AnyErrors = true;
3198 }
3199
3200 if (Tok.is(tok::comma))
3201 ConsumeToken();
3202 else if (Tok.is(tok::l_brace))
3203 break;
3204 // If the next token looks like a base or member initializer, assume that
3205 // we're just missing a comma.
3206 else if (Tok.isOneOf(tok::identifier, tok::coloncolon)) {
3207 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
3208 Diag(Loc, diag::err_ctor_init_missing_comma)
3209 << FixItHint::CreateInsertion(Loc, ", ");
3210 } else {
3211 // Skip over garbage, until we get to '{'. Don't eat the '{'.
3212 Diag(Tok.getLocation(), diag::err_expected_either) << tok::l_brace
3213 << tok::comma;
3214 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
3215 break;
3216 }
3217 } while (true);
3218
3219 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
3220 AnyErrors);
3221 }
3222
3223 /// ParseMemInitializer - Parse a C++ member initializer, which is
3224 /// part of a constructor initializer that explicitly initializes one
3225 /// member or base class (C++ [class.base.init]). See
3226 /// ParseConstructorInitializer for an example.
3227 ///
3228 /// [C++] mem-initializer:
3229 /// mem-initializer-id '(' expression-list[opt] ')'
3230 /// [C++0x] mem-initializer-id braced-init-list
3231 ///
3232 /// [C++] mem-initializer-id:
3233 /// '::'[opt] nested-name-specifier[opt] class-name
3234 /// identifier
ParseMemInitializer(Decl * ConstructorDecl)3235 MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
3236 // parse '::'[opt] nested-name-specifier[opt]
3237 CXXScopeSpec SS;
3238 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
3239 ParsedType TemplateTypeTy;
3240 if (Tok.is(tok::annot_template_id)) {
3241 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
3242 if (TemplateId->Kind == TNK_Type_template ||
3243 TemplateId->Kind == TNK_Dependent_template_name) {
3244 AnnotateTemplateIdTokenAsType();
3245 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
3246 TemplateTypeTy = getTypeAnnotation(Tok);
3247 }
3248 }
3249 // Uses of decltype will already have been converted to annot_decltype by
3250 // ParseOptionalCXXScopeSpecifier at this point.
3251 if (!TemplateTypeTy && Tok.isNot(tok::identifier)
3252 && Tok.isNot(tok::annot_decltype)) {
3253 Diag(Tok, diag::err_expected_member_or_base_name);
3254 return true;
3255 }
3256
3257 IdentifierInfo *II = nullptr;
3258 DeclSpec DS(AttrFactory);
3259 SourceLocation IdLoc = Tok.getLocation();
3260 if (Tok.is(tok::annot_decltype)) {
3261 // Get the decltype expression, if there is one.
3262 ParseDecltypeSpecifier(DS);
3263 } else {
3264 if (Tok.is(tok::identifier))
3265 // Get the identifier. This may be a member name or a class name,
3266 // but we'll let the semantic analysis determine which it is.
3267 II = Tok.getIdentifierInfo();
3268 ConsumeToken();
3269 }
3270
3271
3272 // Parse the '('.
3273 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
3274 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
3275
3276 ExprResult InitList = ParseBraceInitializer();
3277 if (InitList.isInvalid())
3278 return true;
3279
3280 SourceLocation EllipsisLoc;
3281 TryConsumeToken(tok::ellipsis, EllipsisLoc);
3282
3283 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3284 TemplateTypeTy, DS, IdLoc,
3285 InitList.get(), EllipsisLoc);
3286 } else if(Tok.is(tok::l_paren)) {
3287 BalancedDelimiterTracker T(*this, tok::l_paren);
3288 T.consumeOpen();
3289
3290 // Parse the optional expression-list.
3291 ExprVector ArgExprs;
3292 CommaLocsTy CommaLocs;
3293 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
3294 SkipUntil(tok::r_paren, StopAtSemi);
3295 return true;
3296 }
3297
3298 T.consumeClose();
3299
3300 SourceLocation EllipsisLoc;
3301 TryConsumeToken(tok::ellipsis, EllipsisLoc);
3302
3303 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
3304 TemplateTypeTy, DS, IdLoc,
3305 T.getOpenLocation(), ArgExprs,
3306 T.getCloseLocation(), EllipsisLoc);
3307 }
3308
3309 if (getLangOpts().CPlusPlus11)
3310 return Diag(Tok, diag::err_expected_either) << tok::l_paren << tok::l_brace;
3311 else
3312 return Diag(Tok, diag::err_expected) << tok::l_paren;
3313 }
3314
3315 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
3316 ///
3317 /// exception-specification:
3318 /// dynamic-exception-specification
3319 /// noexcept-specification
3320 ///
3321 /// noexcept-specification:
3322 /// 'noexcept'
3323 /// 'noexcept' '(' constant-expression ')'
3324 ExceptionSpecificationType
tryParseExceptionSpecification(bool Delayed,SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & DynamicExceptions,SmallVectorImpl<SourceRange> & DynamicExceptionRanges,ExprResult & NoexceptExpr,CachedTokens * & ExceptionSpecTokens)3325 Parser::tryParseExceptionSpecification(bool Delayed,
3326 SourceRange &SpecificationRange,
3327 SmallVectorImpl<ParsedType> &DynamicExceptions,
3328 SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
3329 ExprResult &NoexceptExpr,
3330 CachedTokens *&ExceptionSpecTokens) {
3331 ExceptionSpecificationType Result = EST_None;
3332 ExceptionSpecTokens = nullptr;
3333
3334 // Handle delayed parsing of exception-specifications.
3335 if (Delayed) {
3336 if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
3337 return EST_None;
3338
3339 // Consume and cache the starting token.
3340 bool IsNoexcept = Tok.is(tok::kw_noexcept);
3341 Token StartTok = Tok;
3342 SpecificationRange = SourceRange(ConsumeToken());
3343
3344 // Check for a '('.
3345 if (!Tok.is(tok::l_paren)) {
3346 // If this is a bare 'noexcept', we're done.
3347 if (IsNoexcept) {
3348 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3349 NoexceptExpr = nullptr;
3350 return EST_BasicNoexcept;
3351 }
3352
3353 Diag(Tok, diag::err_expected_lparen_after) << "throw";
3354 return EST_DynamicNone;
3355 }
3356
3357 // Cache the tokens for the exception-specification.
3358 ExceptionSpecTokens = new CachedTokens;
3359 ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
3360 ExceptionSpecTokens->push_back(Tok); // '('
3361 SpecificationRange.setEnd(ConsumeParen()); // '('
3362
3363 ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
3364 /*StopAtSemi=*/true,
3365 /*ConsumeFinalToken=*/true);
3366 SpecificationRange.setEnd(Tok.getLocation());
3367 return EST_Unparsed;
3368 }
3369
3370 // See if there's a dynamic specification.
3371 if (Tok.is(tok::kw_throw)) {
3372 Result = ParseDynamicExceptionSpecification(SpecificationRange,
3373 DynamicExceptions,
3374 DynamicExceptionRanges);
3375 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
3376 "Produced different number of exception types and ranges.");
3377 }
3378
3379 // If there's no noexcept specification, we're done.
3380 if (Tok.isNot(tok::kw_noexcept))
3381 return Result;
3382
3383 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
3384
3385 // If we already had a dynamic specification, parse the noexcept for,
3386 // recovery, but emit a diagnostic and don't store the results.
3387 SourceRange NoexceptRange;
3388 ExceptionSpecificationType NoexceptType = EST_None;
3389
3390 SourceLocation KeywordLoc = ConsumeToken();
3391 if (Tok.is(tok::l_paren)) {
3392 // There is an argument.
3393 BalancedDelimiterTracker T(*this, tok::l_paren);
3394 T.consumeOpen();
3395 NoexceptType = EST_ComputedNoexcept;
3396 NoexceptExpr = ParseConstantExpression();
3397 T.consumeClose();
3398 // The argument must be contextually convertible to bool. We use
3399 // ActOnBooleanCondition for this purpose.
3400 if (!NoexceptExpr.isInvalid()) {
3401 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
3402 NoexceptExpr.get());
3403 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
3404 } else {
3405 NoexceptType = EST_None;
3406 }
3407 } else {
3408 // There is no argument.
3409 NoexceptType = EST_BasicNoexcept;
3410 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
3411 }
3412
3413 if (Result == EST_None) {
3414 SpecificationRange = NoexceptRange;
3415 Result = NoexceptType;
3416
3417 // If there's a dynamic specification after a noexcept specification,
3418 // parse that and ignore the results.
3419 if (Tok.is(tok::kw_throw)) {
3420 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3421 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
3422 DynamicExceptionRanges);
3423 }
3424 } else {
3425 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
3426 }
3427
3428 return Result;
3429 }
3430
diagnoseDynamicExceptionSpecification(Parser & P,SourceRange Range,bool IsNoexcept)3431 static void diagnoseDynamicExceptionSpecification(
3432 Parser &P, SourceRange Range, bool IsNoexcept) {
3433 if (P.getLangOpts().CPlusPlus11) {
3434 const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
3435 P.Diag(Range.getBegin(), diag::warn_exception_spec_deprecated) << Range;
3436 P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
3437 << Replacement << FixItHint::CreateReplacement(Range, Replacement);
3438 }
3439 }
3440
3441 /// ParseDynamicExceptionSpecification - Parse a C++
3442 /// dynamic-exception-specification (C++ [except.spec]).
3443 ///
3444 /// dynamic-exception-specification:
3445 /// 'throw' '(' type-id-list [opt] ')'
3446 /// [MS] 'throw' '(' '...' ')'
3447 ///
3448 /// type-id-list:
3449 /// type-id ... [opt]
3450 /// type-id-list ',' type-id ... [opt]
3451 ///
ParseDynamicExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & Exceptions,SmallVectorImpl<SourceRange> & Ranges)3452 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
3453 SourceRange &SpecificationRange,
3454 SmallVectorImpl<ParsedType> &Exceptions,
3455 SmallVectorImpl<SourceRange> &Ranges) {
3456 assert(Tok.is(tok::kw_throw) && "expected throw");
3457
3458 SpecificationRange.setBegin(ConsumeToken());
3459 BalancedDelimiterTracker T(*this, tok::l_paren);
3460 if (T.consumeOpen()) {
3461 Diag(Tok, diag::err_expected_lparen_after) << "throw";
3462 SpecificationRange.setEnd(SpecificationRange.getBegin());
3463 return EST_DynamicNone;
3464 }
3465
3466 // Parse throw(...), a Microsoft extension that means "this function
3467 // can throw anything".
3468 if (Tok.is(tok::ellipsis)) {
3469 SourceLocation EllipsisLoc = ConsumeToken();
3470 if (!getLangOpts().MicrosoftExt)
3471 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
3472 T.consumeClose();
3473 SpecificationRange.setEnd(T.getCloseLocation());
3474 diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
3475 return EST_MSAny;
3476 }
3477
3478 // Parse the sequence of type-ids.
3479 SourceRange Range;
3480 while (Tok.isNot(tok::r_paren)) {
3481 TypeResult Res(ParseTypeName(&Range));
3482
3483 if (Tok.is(tok::ellipsis)) {
3484 // C++0x [temp.variadic]p5:
3485 // - In a dynamic-exception-specification (15.4); the pattern is a
3486 // type-id.
3487 SourceLocation Ellipsis = ConsumeToken();
3488 Range.setEnd(Ellipsis);
3489 if (!Res.isInvalid())
3490 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
3491 }
3492
3493 if (!Res.isInvalid()) {
3494 Exceptions.push_back(Res.get());
3495 Ranges.push_back(Range);
3496 }
3497
3498 if (!TryConsumeToken(tok::comma))
3499 break;
3500 }
3501
3502 T.consumeClose();
3503 SpecificationRange.setEnd(T.getCloseLocation());
3504 diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
3505 Exceptions.empty());
3506 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3507 }
3508
3509 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
3510 /// function declaration.
ParseTrailingReturnType(SourceRange & Range)3511 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
3512 assert(Tok.is(tok::arrow) && "expected arrow");
3513
3514 ConsumeToken();
3515
3516 return ParseTypeName(&Range, Declarator::TrailingReturnContext);
3517 }
3518
3519 /// \brief We have just started parsing the definition of a new class,
3520 /// so push that class onto our stack of classes that is currently
3521 /// being parsed.
3522 Sema::ParsingClassState
PushParsingClass(Decl * ClassDecl,bool NonNestedClass,bool IsInterface)3523 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
3524 bool IsInterface) {
3525 assert((NonNestedClass || !ClassStack.empty()) &&
3526 "Nested class without outer class");
3527 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
3528 return Actions.PushParsingClass();
3529 }
3530
3531 /// \brief Deallocate the given parsed class and all of its nested
3532 /// classes.
DeallocateParsedClasses(Parser::ParsingClass * Class)3533 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
3534 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
3535 delete Class->LateParsedDeclarations[I];
3536 delete Class;
3537 }
3538
3539 /// \brief Pop the top class of the stack of classes that are
3540 /// currently being parsed.
3541 ///
3542 /// This routine should be called when we have finished parsing the
3543 /// definition of a class, but have not yet popped the Scope
3544 /// associated with the class's definition.
PopParsingClass(Sema::ParsingClassState state)3545 void Parser::PopParsingClass(Sema::ParsingClassState state) {
3546 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
3547
3548 Actions.PopParsingClass(state);
3549
3550 ParsingClass *Victim = ClassStack.top();
3551 ClassStack.pop();
3552 if (Victim->TopLevelClass) {
3553 // Deallocate all of the nested classes of this class,
3554 // recursively: we don't need to keep any of this information.
3555 DeallocateParsedClasses(Victim);
3556 return;
3557 }
3558 assert(!ClassStack.empty() && "Missing top-level class?");
3559
3560 if (Victim->LateParsedDeclarations.empty()) {
3561 // The victim is a nested class, but we will not need to perform
3562 // any processing after the definition of this class since it has
3563 // no members whose handling was delayed. Therefore, we can just
3564 // remove this nested class.
3565 DeallocateParsedClasses(Victim);
3566 return;
3567 }
3568
3569 // This nested class has some members that will need to be processed
3570 // after the top-level class is completely defined. Therefore, add
3571 // it to the list of nested classes within its parent.
3572 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
3573 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
3574 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
3575 }
3576
3577 /// \brief Try to parse an 'identifier' which appears within an attribute-token.
3578 ///
3579 /// \return the parsed identifier on success, and 0 if the next token is not an
3580 /// attribute-token.
3581 ///
3582 /// C++11 [dcl.attr.grammar]p3:
3583 /// If a keyword or an alternative token that satisfies the syntactic
3584 /// requirements of an identifier is contained in an attribute-token,
3585 /// it is considered an identifier.
TryParseCXX11AttributeIdentifier(SourceLocation & Loc)3586 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
3587 switch (Tok.getKind()) {
3588 default:
3589 // Identifiers and keywords have identifier info attached.
3590 if (!Tok.isAnnotation()) {
3591 if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
3592 Loc = ConsumeToken();
3593 return II;
3594 }
3595 }
3596 return nullptr;
3597
3598 case tok::ampamp: // 'and'
3599 case tok::pipe: // 'bitor'
3600 case tok::pipepipe: // 'or'
3601 case tok::caret: // 'xor'
3602 case tok::tilde: // 'compl'
3603 case tok::amp: // 'bitand'
3604 case tok::ampequal: // 'and_eq'
3605 case tok::pipeequal: // 'or_eq'
3606 case tok::caretequal: // 'xor_eq'
3607 case tok::exclaim: // 'not'
3608 case tok::exclaimequal: // 'not_eq'
3609 // Alternative tokens do not have identifier info, but their spelling
3610 // starts with an alphabetical character.
3611 SmallString<8> SpellingBuf;
3612 SourceLocation SpellingLoc =
3613 PP.getSourceManager().getSpellingLoc(Tok.getLocation());
3614 StringRef Spelling = PP.getSpelling(SpellingLoc, SpellingBuf);
3615 if (isLetter(Spelling[0])) {
3616 Loc = ConsumeToken();
3617 return &PP.getIdentifierTable().get(Spelling);
3618 }
3619 return nullptr;
3620 }
3621 }
3622
IsBuiltInOrStandardCXX11Attribute(IdentifierInfo * AttrName,IdentifierInfo * ScopeName)3623 static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
3624 IdentifierInfo *ScopeName) {
3625 switch (AttributeList::getKind(AttrName, ScopeName,
3626 AttributeList::AS_CXX11)) {
3627 case AttributeList::AT_CarriesDependency:
3628 case AttributeList::AT_Deprecated:
3629 case AttributeList::AT_FallThrough:
3630 case AttributeList::AT_CXX11NoReturn:
3631 return true;
3632
3633 default:
3634 return false;
3635 }
3636 }
3637
3638 /// ParseCXX11AttributeArgs -- Parse a C++11 attribute-argument-clause.
3639 ///
3640 /// [C++11] attribute-argument-clause:
3641 /// '(' balanced-token-seq ')'
3642 ///
3643 /// [C++11] balanced-token-seq:
3644 /// balanced-token
3645 /// balanced-token-seq balanced-token
3646 ///
3647 /// [C++11] balanced-token:
3648 /// '(' balanced-token-seq ')'
3649 /// '[' balanced-token-seq ']'
3650 /// '{' balanced-token-seq '}'
3651 /// any token but '(', ')', '[', ']', '{', or '}'
ParseCXX11AttributeArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc)3652 bool Parser::ParseCXX11AttributeArgs(IdentifierInfo *AttrName,
3653 SourceLocation AttrNameLoc,
3654 ParsedAttributes &Attrs,
3655 SourceLocation *EndLoc,
3656 IdentifierInfo *ScopeName,
3657 SourceLocation ScopeLoc) {
3658 assert(Tok.is(tok::l_paren) && "Not a C++11 attribute argument list");
3659 SourceLocation LParenLoc = Tok.getLocation();
3660
3661 // If the attribute isn't known, we will not attempt to parse any
3662 // arguments.
3663 if (!hasAttribute(AttrSyntax::CXX, ScopeName, AttrName,
3664 getTargetInfo(), getLangOpts())) {
3665 // Eat the left paren, then skip to the ending right paren.
3666 ConsumeParen();
3667 SkipUntil(tok::r_paren);
3668 return false;
3669 }
3670
3671 if (ScopeName && ScopeName->getName() == "gnu")
3672 // GNU-scoped attributes have some special cases to handle GNU-specific
3673 // behaviors.
3674 ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
3675 ScopeLoc, AttributeList::AS_CXX11, nullptr);
3676 else {
3677 unsigned NumArgs =
3678 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
3679 ScopeName, ScopeLoc, AttributeList::AS_CXX11);
3680
3681 const AttributeList *Attr = Attrs.getList();
3682 if (Attr && IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName)) {
3683 // If the attribute is a standard or built-in attribute and we are
3684 // parsing an argument list, we need to determine whether this attribute
3685 // was allowed to have an argument list (such as [[deprecated]]), and how
3686 // many arguments were parsed (so we can diagnose on [[deprecated()]]).
3687 if (Attr->getMaxArgs() && !NumArgs) {
3688 // The attribute was allowed to have arguments, but none were provided
3689 // even though the attribute parsed successfully. This is an error.
3690 Diag(LParenLoc, diag::err_attribute_requires_arguments) << AttrName;
3691 } else if (!Attr->getMaxArgs()) {
3692 // The attribute parsed successfully, but was not allowed to have any
3693 // arguments. It doesn't matter whether any were provided -- the
3694 // presence of the argument list (even if empty) is diagnosed.
3695 Diag(LParenLoc, diag::err_cxx11_attribute_forbids_arguments)
3696 << AttrName
3697 << FixItHint::CreateRemoval(SourceRange(LParenLoc, *EndLoc));
3698 }
3699 }
3700 }
3701 return true;
3702 }
3703
3704 /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier.
3705 ///
3706 /// [C++11] attribute-specifier:
3707 /// '[' '[' attribute-list ']' ']'
3708 /// alignment-specifier
3709 ///
3710 /// [C++11] attribute-list:
3711 /// attribute[opt]
3712 /// attribute-list ',' attribute[opt]
3713 /// attribute '...'
3714 /// attribute-list ',' attribute '...'
3715 ///
3716 /// [C++11] attribute:
3717 /// attribute-token attribute-argument-clause[opt]
3718 ///
3719 /// [C++11] attribute-token:
3720 /// identifier
3721 /// attribute-scoped-token
3722 ///
3723 /// [C++11] attribute-scoped-token:
3724 /// attribute-namespace '::' identifier
3725 ///
3726 /// [C++11] attribute-namespace:
3727 /// identifier
ParseCXX11AttributeSpecifier(ParsedAttributes & attrs,SourceLocation * endLoc)3728 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
3729 SourceLocation *endLoc) {
3730 if (Tok.is(tok::kw_alignas)) {
3731 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
3732 ParseAlignmentSpecifier(attrs, endLoc);
3733 return;
3734 }
3735
3736 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
3737 && "Not a C++11 attribute list");
3738
3739 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
3740
3741 ConsumeBracket();
3742 ConsumeBracket();
3743
3744 llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
3745
3746 while (Tok.isNot(tok::r_square)) {
3747 // attribute not present
3748 if (TryConsumeToken(tok::comma))
3749 continue;
3750
3751 SourceLocation ScopeLoc, AttrLoc;
3752 IdentifierInfo *ScopeName = nullptr, *AttrName = nullptr;
3753
3754 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3755 if (!AttrName)
3756 // Break out to the "expected ']'" diagnostic.
3757 break;
3758
3759 // scoped attribute
3760 if (TryConsumeToken(tok::coloncolon)) {
3761 ScopeName = AttrName;
3762 ScopeLoc = AttrLoc;
3763
3764 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3765 if (!AttrName) {
3766 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
3767 SkipUntil(tok::r_square, tok::comma, StopAtSemi | StopBeforeMatch);
3768 continue;
3769 }
3770 }
3771
3772 bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName, ScopeName);
3773 bool AttrParsed = false;
3774
3775 if (StandardAttr &&
3776 !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second)
3777 Diag(AttrLoc, diag::err_cxx11_attribute_repeated)
3778 << AttrName << SourceRange(SeenAttrs[AttrName]);
3779
3780 // Parse attribute arguments
3781 if (Tok.is(tok::l_paren))
3782 AttrParsed = ParseCXX11AttributeArgs(AttrName, AttrLoc, attrs, endLoc,
3783 ScopeName, ScopeLoc);
3784
3785 if (!AttrParsed)
3786 attrs.addNew(AttrName,
3787 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc,
3788 AttrLoc),
3789 ScopeName, ScopeLoc, nullptr, 0, AttributeList::AS_CXX11);
3790
3791 if (TryConsumeToken(tok::ellipsis))
3792 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
3793 << AttrName->getName();
3794 }
3795
3796 if (ExpectAndConsume(tok::r_square))
3797 SkipUntil(tok::r_square);
3798 if (endLoc)
3799 *endLoc = Tok.getLocation();
3800 if (ExpectAndConsume(tok::r_square))
3801 SkipUntil(tok::r_square);
3802 }
3803
3804 /// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq.
3805 ///
3806 /// attribute-specifier-seq:
3807 /// attribute-specifier-seq[opt] attribute-specifier
ParseCXX11Attributes(ParsedAttributesWithRange & attrs,SourceLocation * endLoc)3808 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
3809 SourceLocation *endLoc) {
3810 assert(getLangOpts().CPlusPlus11);
3811
3812 SourceLocation StartLoc = Tok.getLocation(), Loc;
3813 if (!endLoc)
3814 endLoc = &Loc;
3815
3816 do {
3817 ParseCXX11AttributeSpecifier(attrs, endLoc);
3818 } while (isCXX11AttributeSpecifier());
3819
3820 attrs.Range = SourceRange(StartLoc, *endLoc);
3821 }
3822
DiagnoseAndSkipCXX11Attributes()3823 void Parser::DiagnoseAndSkipCXX11Attributes() {
3824 // Start and end location of an attribute or an attribute list.
3825 SourceLocation StartLoc = Tok.getLocation();
3826 SourceLocation EndLoc = SkipCXX11Attributes();
3827
3828 if (EndLoc.isValid()) {
3829 SourceRange Range(StartLoc, EndLoc);
3830 Diag(StartLoc, diag::err_attributes_not_allowed)
3831 << Range;
3832 }
3833 }
3834
SkipCXX11Attributes()3835 SourceLocation Parser::SkipCXX11Attributes() {
3836 SourceLocation EndLoc;
3837
3838 if (!isCXX11AttributeSpecifier())
3839 return EndLoc;
3840
3841 do {
3842 if (Tok.is(tok::l_square)) {
3843 BalancedDelimiterTracker T(*this, tok::l_square);
3844 T.consumeOpen();
3845 T.skipToEnd();
3846 EndLoc = T.getCloseLocation();
3847 } else {
3848 assert(Tok.is(tok::kw_alignas) && "not an attribute specifier");
3849 ConsumeToken();
3850 BalancedDelimiterTracker T(*this, tok::l_paren);
3851 if (!T.consumeOpen())
3852 T.skipToEnd();
3853 EndLoc = T.getCloseLocation();
3854 }
3855 } while (isCXX11AttributeSpecifier());
3856
3857 return EndLoc;
3858 }
3859
3860 /// ParseMicrosoftAttributes - Parse Microsoft attributes [Attr]
3861 ///
3862 /// [MS] ms-attribute:
3863 /// '[' token-seq ']'
3864 ///
3865 /// [MS] ms-attribute-seq:
3866 /// ms-attribute[opt]
3867 /// ms-attribute ms-attribute-seq
ParseMicrosoftAttributes(ParsedAttributes & attrs,SourceLocation * endLoc)3868 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
3869 SourceLocation *endLoc) {
3870 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
3871
3872 do {
3873 // FIXME: If this is actually a C++11 attribute, parse it as one.
3874 BalancedDelimiterTracker T(*this, tok::l_square);
3875 T.consumeOpen();
3876 SkipUntil(tok::r_square, StopAtSemi | StopBeforeMatch);
3877 T.consumeClose();
3878 if (endLoc)
3879 *endLoc = T.getCloseLocation();
3880 } while (Tok.is(tok::l_square));
3881 }
3882
ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,AccessSpecifier & CurAS)3883 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
3884 AccessSpecifier& CurAS) {
3885 IfExistsCondition Result;
3886 if (ParseMicrosoftIfExistsCondition(Result))
3887 return;
3888
3889 BalancedDelimiterTracker Braces(*this, tok::l_brace);
3890 if (Braces.consumeOpen()) {
3891 Diag(Tok, diag::err_expected) << tok::l_brace;
3892 return;
3893 }
3894
3895 switch (Result.Behavior) {
3896 case IEB_Parse:
3897 // Parse the declarations below.
3898 break;
3899
3900 case IEB_Dependent:
3901 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
3902 << Result.IsIfExists;
3903 // Fall through to skip.
3904
3905 case IEB_Skip:
3906 Braces.skipToEnd();
3907 return;
3908 }
3909
3910 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
3911 // __if_exists, __if_not_exists can nest.
3912 if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
3913 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
3914 continue;
3915 }
3916
3917 // Check for extraneous top-level semicolon.
3918 if (Tok.is(tok::semi)) {
3919 ConsumeExtraSemi(InsideStruct, TagType);
3920 continue;
3921 }
3922
3923 AccessSpecifier AS = getAccessSpecifierIfPresent();
3924 if (AS != AS_none) {
3925 // Current token is a C++ access specifier.
3926 CurAS = AS;
3927 SourceLocation ASLoc = Tok.getLocation();
3928 ConsumeToken();
3929 if (Tok.is(tok::colon))
3930 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
3931 else
3932 Diag(Tok, diag::err_expected) << tok::colon;
3933 ConsumeToken();
3934 continue;
3935 }
3936
3937 // Parse all the comma separated declarators.
3938 ParseCXXClassMemberDeclaration(CurAS, nullptr);
3939 }
3940
3941 Braces.consumeClose();
3942 }
3943