1 //===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the C++ Declaration portions of the Parser interfaces.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Parse/Parser.h"
15 #include "RAIIObjectsForParser.h"
16 #include "clang/Basic/CharInfo.h"
17 #include "clang/Basic/OperatorKinds.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/Parse/ParseDiagnostic.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.h"
22 #include "clang/Sema/PrettyDeclStackTrace.h"
23 #include "clang/Sema/Scope.h"
24 #include "clang/Sema/SemaDiagnostic.h"
25 #include "llvm/ADT/SmallString.h"
26 using namespace clang;
27
28 /// ParseNamespace - We know that the current token is a namespace keyword. This
29 /// may either be a top level namespace or a block-level namespace alias. If
30 /// there was an inline keyword, it has already been parsed.
31 ///
32 /// namespace-definition: [C++ 7.3: basic.namespace]
33 /// named-namespace-definition
34 /// unnamed-namespace-definition
35 ///
36 /// unnamed-namespace-definition:
37 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
38 ///
39 /// named-namespace-definition:
40 /// original-namespace-definition
41 /// extension-namespace-definition
42 ///
43 /// original-namespace-definition:
44 /// 'inline'[opt] 'namespace' identifier attributes[opt]
45 /// '{' namespace-body '}'
46 ///
47 /// extension-namespace-definition:
48 /// 'inline'[opt] 'namespace' original-namespace-name
49 /// '{' namespace-body '}'
50 ///
51 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
52 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
53 ///
ParseNamespace(unsigned Context,SourceLocation & DeclEnd,SourceLocation InlineLoc)54 Decl *Parser::ParseNamespace(unsigned Context,
55 SourceLocation &DeclEnd,
56 SourceLocation InlineLoc) {
57 assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
58 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
59 ObjCDeclContextSwitch ObjCDC(*this);
60
61 if (Tok.is(tok::code_completion)) {
62 Actions.CodeCompleteNamespaceDecl(getCurScope());
63 cutOffParsing();
64 return 0;
65 }
66
67 SourceLocation IdentLoc;
68 IdentifierInfo *Ident = 0;
69 std::vector<SourceLocation> ExtraIdentLoc;
70 std::vector<IdentifierInfo*> ExtraIdent;
71 std::vector<SourceLocation> ExtraNamespaceLoc;
72
73 Token attrTok;
74
75 if (Tok.is(tok::identifier)) {
76 Ident = Tok.getIdentifierInfo();
77 IdentLoc = ConsumeToken(); // eat the identifier.
78 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
79 ExtraNamespaceLoc.push_back(ConsumeToken());
80 ExtraIdent.push_back(Tok.getIdentifierInfo());
81 ExtraIdentLoc.push_back(ConsumeToken());
82 }
83 }
84
85 // Read label attributes, if present.
86 ParsedAttributes attrs(AttrFactory);
87 if (Tok.is(tok::kw___attribute)) {
88 attrTok = Tok;
89 ParseGNUAttributes(attrs);
90 }
91
92 if (Tok.is(tok::equal)) {
93 if (Ident == 0) {
94 Diag(Tok, diag::err_expected_ident);
95 // Skip to end of the definition and eat the ';'.
96 SkipUntil(tok::semi);
97 return 0;
98 }
99 if (!attrs.empty())
100 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
101 if (InlineLoc.isValid())
102 Diag(InlineLoc, diag::err_inline_namespace_alias)
103 << FixItHint::CreateRemoval(InlineLoc);
104 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
105 }
106
107
108 BalancedDelimiterTracker T(*this, tok::l_brace);
109 if (T.consumeOpen()) {
110 if (!ExtraIdent.empty()) {
111 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
112 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
113 }
114 Diag(Tok, Ident ? diag::err_expected_lbrace :
115 diag::err_expected_ident_lbrace);
116 return 0;
117 }
118
119 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
120 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
121 getCurScope()->getFnParent()) {
122 if (!ExtraIdent.empty()) {
123 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
124 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
125 }
126 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
127 SkipUntil(tok::r_brace, false);
128 return 0;
129 }
130
131 if (!ExtraIdent.empty()) {
132 TentativeParsingAction TPA(*this);
133 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true);
134 Token rBraceToken = Tok;
135 TPA.Revert();
136
137 if (!rBraceToken.is(tok::r_brace)) {
138 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
139 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
140 } else {
141 std::string NamespaceFix;
142 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
143 E = ExtraIdent.end(); I != E; ++I) {
144 NamespaceFix += " { namespace ";
145 NamespaceFix += (*I)->getName();
146 }
147
148 std::string RBraces;
149 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
150 RBraces += "} ";
151
152 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
153 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
154 ExtraIdentLoc.back()),
155 NamespaceFix)
156 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
157 }
158 }
159
160 // If we're still good, complain about inline namespaces in non-C++0x now.
161 if (InlineLoc.isValid())
162 Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
163 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
164
165 // Enter a scope for the namespace.
166 ParseScope NamespaceScope(this, Scope::DeclScope);
167
168 Decl *NamespcDecl =
169 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
170 IdentLoc, Ident, T.getOpenLocation(),
171 attrs.getList());
172
173 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
174 "parsing namespace");
175
176 // Parse the contents of the namespace. This includes parsing recovery on
177 // any improperly nested namespaces.
178 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
179 InlineLoc, attrs, T);
180
181 // Leave the namespace scope.
182 NamespaceScope.Exit();
183
184 DeclEnd = T.getCloseLocation();
185 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
186
187 return NamespcDecl;
188 }
189
190 /// 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)191 void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc,
192 std::vector<IdentifierInfo*>& Ident,
193 std::vector<SourceLocation>& NamespaceLoc,
194 unsigned int index, SourceLocation& InlineLoc,
195 ParsedAttributes& attrs,
196 BalancedDelimiterTracker &Tracker) {
197 if (index == Ident.size()) {
198 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
199 ParsedAttributesWithRange attrs(AttrFactory);
200 MaybeParseCXX11Attributes(attrs);
201 MaybeParseMicrosoftAttributes(attrs);
202 ParseExternalDeclaration(attrs);
203 }
204
205 // The caller is what called check -- we are simply calling
206 // the close for it.
207 Tracker.consumeClose();
208
209 return;
210 }
211
212 // Parse improperly nested namespaces.
213 ParseScope NamespaceScope(this, Scope::DeclScope);
214 Decl *NamespcDecl =
215 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
216 NamespaceLoc[index], IdentLoc[index],
217 Ident[index], Tracker.getOpenLocation(),
218 attrs.getList());
219
220 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
221 attrs, Tracker);
222
223 NamespaceScope.Exit();
224
225 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
226 }
227
228 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
229 /// alias definition.
230 ///
ParseNamespaceAlias(SourceLocation NamespaceLoc,SourceLocation AliasLoc,IdentifierInfo * Alias,SourceLocation & DeclEnd)231 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
232 SourceLocation AliasLoc,
233 IdentifierInfo *Alias,
234 SourceLocation &DeclEnd) {
235 assert(Tok.is(tok::equal) && "Not equal token");
236
237 ConsumeToken(); // eat the '='.
238
239 if (Tok.is(tok::code_completion)) {
240 Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
241 cutOffParsing();
242 return 0;
243 }
244
245 CXXScopeSpec SS;
246 // Parse (optional) nested-name-specifier.
247 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
248
249 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
250 Diag(Tok, diag::err_expected_namespace_name);
251 // Skip to end of the definition and eat the ';'.
252 SkipUntil(tok::semi);
253 return 0;
254 }
255
256 // Parse identifier.
257 IdentifierInfo *Ident = Tok.getIdentifierInfo();
258 SourceLocation IdentLoc = ConsumeToken();
259
260 // Eat the ';'.
261 DeclEnd = Tok.getLocation();
262 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
263 "", tok::semi);
264
265 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
266 SS, IdentLoc, Ident);
267 }
268
269 /// ParseLinkage - We know that the current token is a string_literal
270 /// and just before that, that extern was seen.
271 ///
272 /// linkage-specification: [C++ 7.5p2: dcl.link]
273 /// 'extern' string-literal '{' declaration-seq[opt] '}'
274 /// 'extern' string-literal declaration
275 ///
ParseLinkage(ParsingDeclSpec & DS,unsigned Context)276 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
277 assert(Tok.is(tok::string_literal) && "Not a string literal!");
278 SmallString<8> LangBuffer;
279 bool Invalid = false;
280 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
281 if (Invalid)
282 return 0;
283
284 // FIXME: This is incorrect: linkage-specifiers are parsed in translation
285 // phase 7, so string-literal concatenation is supposed to occur.
286 // extern "" "C" "" "+" "+" { } is legal.
287 if (Tok.hasUDSuffix())
288 Diag(Tok, diag::err_invalid_string_udl);
289 SourceLocation Loc = ConsumeStringToken();
290
291 ParseScope LinkageScope(this, Scope::DeclScope);
292 Decl *LinkageSpec
293 = Actions.ActOnStartLinkageSpecification(getCurScope(),
294 DS.getSourceRange().getBegin(),
295 Loc, Lang,
296 Tok.is(tok::l_brace) ? Tok.getLocation()
297 : SourceLocation());
298
299 ParsedAttributesWithRange attrs(AttrFactory);
300 MaybeParseCXX11Attributes(attrs);
301 MaybeParseMicrosoftAttributes(attrs);
302
303 if (Tok.isNot(tok::l_brace)) {
304 // Reset the source range in DS, as the leading "extern"
305 // does not really belong to the inner declaration ...
306 DS.SetRangeStart(SourceLocation());
307 DS.SetRangeEnd(SourceLocation());
308 // ... but anyway remember that such an "extern" was seen.
309 DS.setExternInLinkageSpec(true);
310 ParseExternalDeclaration(attrs, &DS);
311 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
312 SourceLocation());
313 }
314
315 DS.abort();
316
317 ProhibitAttributes(attrs);
318
319 BalancedDelimiterTracker T(*this, tok::l_brace);
320 T.consumeOpen();
321 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
322 ParsedAttributesWithRange attrs(AttrFactory);
323 MaybeParseCXX11Attributes(attrs);
324 MaybeParseMicrosoftAttributes(attrs);
325 ParseExternalDeclaration(attrs);
326 }
327
328 T.consumeClose();
329 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
330 T.getCloseLocation());
331 }
332
333 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
334 /// using-directive. Assumes that current token is 'using'.
ParseUsingDirectiveOrDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,Decl ** OwnedType)335 Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
336 const ParsedTemplateInfo &TemplateInfo,
337 SourceLocation &DeclEnd,
338 ParsedAttributesWithRange &attrs,
339 Decl **OwnedType) {
340 assert(Tok.is(tok::kw_using) && "Not using token");
341 ObjCDeclContextSwitch ObjCDC(*this);
342
343 // Eat 'using'.
344 SourceLocation UsingLoc = ConsumeToken();
345
346 if (Tok.is(tok::code_completion)) {
347 Actions.CodeCompleteUsing(getCurScope());
348 cutOffParsing();
349 return 0;
350 }
351
352 // 'using namespace' means this is a using-directive.
353 if (Tok.is(tok::kw_namespace)) {
354 // Template parameters are always an error here.
355 if (TemplateInfo.Kind) {
356 SourceRange R = TemplateInfo.getSourceRange();
357 Diag(UsingLoc, diag::err_templated_using_directive)
358 << R << FixItHint::CreateRemoval(R);
359 }
360
361 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
362 }
363
364 // Otherwise, it must be a using-declaration or an alias-declaration.
365
366 // Using declarations can't have attributes.
367 ProhibitAttributes(attrs);
368
369 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
370 AS_none, OwnedType);
371 }
372
373 /// ParseUsingDirective - Parse C++ using-directive, assumes
374 /// that current token is 'namespace' and 'using' was already parsed.
375 ///
376 /// using-directive: [C++ 7.3.p4: namespace.udir]
377 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
378 /// namespace-name ;
379 /// [GNU] using-directive:
380 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
381 /// namespace-name attributes[opt] ;
382 ///
ParseUsingDirective(unsigned Context,SourceLocation UsingLoc,SourceLocation & DeclEnd,ParsedAttributes & attrs)383 Decl *Parser::ParseUsingDirective(unsigned Context,
384 SourceLocation UsingLoc,
385 SourceLocation &DeclEnd,
386 ParsedAttributes &attrs) {
387 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
388
389 // Eat 'namespace'.
390 SourceLocation NamespcLoc = ConsumeToken();
391
392 if (Tok.is(tok::code_completion)) {
393 Actions.CodeCompleteUsingDirective(getCurScope());
394 cutOffParsing();
395 return 0;
396 }
397
398 CXXScopeSpec SS;
399 // Parse (optional) nested-name-specifier.
400 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
401
402 IdentifierInfo *NamespcName = 0;
403 SourceLocation IdentLoc = SourceLocation();
404
405 // Parse namespace-name.
406 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
407 Diag(Tok, diag::err_expected_namespace_name);
408 // If there was invalid namespace name, skip to end of decl, and eat ';'.
409 SkipUntil(tok::semi);
410 // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
411 return 0;
412 }
413
414 // Parse identifier.
415 NamespcName = Tok.getIdentifierInfo();
416 IdentLoc = ConsumeToken();
417
418 // Parse (optional) attributes (most likely GNU strong-using extension).
419 bool GNUAttr = false;
420 if (Tok.is(tok::kw___attribute)) {
421 GNUAttr = true;
422 ParseGNUAttributes(attrs);
423 }
424
425 // Eat ';'.
426 DeclEnd = Tok.getLocation();
427 ExpectAndConsume(tok::semi,
428 GNUAttr ? diag::err_expected_semi_after_attribute_list
429 : diag::err_expected_semi_after_namespace_name,
430 "", tok::semi);
431
432 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
433 IdentLoc, NamespcName, attrs.getList());
434 }
435
436 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
437 /// Assumes that 'using' was already seen.
438 ///
439 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
440 /// 'using' 'typename'[opt] ::[opt] nested-name-specifier
441 /// unqualified-id
442 /// 'using' :: unqualified-id
443 ///
444 /// alias-declaration: C++11 [dcl.dcl]p1
445 /// 'using' identifier attribute-specifier-seq[opt] = type-id ;
446 ///
ParseUsingDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation UsingLoc,SourceLocation & DeclEnd,AccessSpecifier AS,Decl ** OwnedType)447 Decl *Parser::ParseUsingDeclaration(unsigned Context,
448 const ParsedTemplateInfo &TemplateInfo,
449 SourceLocation UsingLoc,
450 SourceLocation &DeclEnd,
451 AccessSpecifier AS,
452 Decl **OwnedType) {
453 CXXScopeSpec SS;
454 SourceLocation TypenameLoc;
455 bool HasTypenameKeyword = false;
456 ParsedAttributesWithRange Attrs(AttrFactory);
457
458 // FIXME: Simply skip the attributes and diagnose, don't bother parsing them.
459 MaybeParseCXX11Attributes(Attrs);
460 ProhibitAttributes(Attrs);
461 Attrs.clear();
462 Attrs.Range = SourceRange();
463
464 // Ignore optional 'typename'.
465 // FIXME: This is wrong; we should parse this as a typename-specifier.
466 if (Tok.is(tok::kw_typename)) {
467 TypenameLoc = ConsumeToken();
468 HasTypenameKeyword = true;
469 }
470
471 // Parse nested-name-specifier.
472 IdentifierInfo *LastII = 0;
473 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false,
474 /*MayBePseudoDtor=*/0, /*IsTypename=*/false,
475 /*LastII=*/&LastII);
476
477 // Check nested-name specifier.
478 if (SS.isInvalid()) {
479 SkipUntil(tok::semi);
480 return 0;
481 }
482
483 SourceLocation TemplateKWLoc;
484 UnqualifiedId Name;
485
486 // Parse the unqualified-id. We allow parsing of both constructor and
487 // destructor names and allow the action module to diagnose any semantic
488 // errors.
489 //
490 // C++11 [class.qual]p2:
491 // [...] in a using-declaration that is a member-declaration, if the name
492 // specified after the nested-name-specifier is the same as the identifier
493 // or the simple-template-id's template-name in the last component of the
494 // nested-name-specifier, the name is [...] considered to name the
495 // constructor.
496 if (getLangOpts().CPlusPlus11 && Context == Declarator::MemberContext &&
497 Tok.is(tok::identifier) && NextToken().is(tok::semi) &&
498 SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
499 !SS.getScopeRep()->getAsNamespace() &&
500 !SS.getScopeRep()->getAsNamespaceAlias()) {
501 SourceLocation IdLoc = ConsumeToken();
502 ParsedType Type = Actions.getInheritingConstructorName(SS, IdLoc, *LastII);
503 Name.setConstructorName(Type, IdLoc, IdLoc);
504 } else if (ParseUnqualifiedId(SS, /*EnteringContext=*/ false,
505 /*AllowDestructorName=*/ true,
506 /*AllowConstructorName=*/ true, ParsedType(),
507 TemplateKWLoc, Name)) {
508 SkipUntil(tok::semi);
509 return 0;
510 }
511
512 MaybeParseCXX11Attributes(Attrs);
513
514 // Maybe this is an alias-declaration.
515 bool IsAliasDecl = Tok.is(tok::equal);
516 TypeResult TypeAlias;
517 if (IsAliasDecl) {
518 // TODO: Can GNU attributes appear here?
519 ConsumeToken();
520
521 Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
522 diag::warn_cxx98_compat_alias_declaration :
523 diag::ext_alias_declaration);
524
525 // Type alias templates cannot be specialized.
526 int SpecKind = -1;
527 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
528 Name.getKind() == UnqualifiedId::IK_TemplateId)
529 SpecKind = 0;
530 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
531 SpecKind = 1;
532 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
533 SpecKind = 2;
534 if (SpecKind != -1) {
535 SourceRange Range;
536 if (SpecKind == 0)
537 Range = SourceRange(Name.TemplateId->LAngleLoc,
538 Name.TemplateId->RAngleLoc);
539 else
540 Range = TemplateInfo.getSourceRange();
541 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
542 << SpecKind << Range;
543 SkipUntil(tok::semi);
544 return 0;
545 }
546
547 // Name must be an identifier.
548 if (Name.getKind() != UnqualifiedId::IK_Identifier) {
549 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
550 // No removal fixit: can't recover from this.
551 SkipUntil(tok::semi);
552 return 0;
553 } else if (HasTypenameKeyword)
554 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
555 << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
556 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
557 else if (SS.isNotEmpty())
558 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
559 << FixItHint::CreateRemoval(SS.getRange());
560
561 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ?
562 Declarator::AliasTemplateContext :
563 Declarator::AliasDeclContext, AS, OwnedType,
564 &Attrs);
565 } else {
566 // C++11 attributes are not allowed on a using-declaration, but GNU ones
567 // are.
568 ProhibitAttributes(Attrs);
569
570 // Parse (optional) attributes (most likely GNU strong-using extension).
571 MaybeParseGNUAttributes(Attrs);
572 }
573
574 // Eat ';'.
575 DeclEnd = Tok.getLocation();
576 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
577 !Attrs.empty() ? "attributes list" :
578 IsAliasDecl ? "alias declaration" : "using declaration",
579 tok::semi);
580
581 // Diagnose an attempt to declare a templated using-declaration.
582 // In C++11, alias-declarations can be templates:
583 // template <...> using id = type;
584 if (TemplateInfo.Kind && !IsAliasDecl) {
585 SourceRange R = TemplateInfo.getSourceRange();
586 Diag(UsingLoc, diag::err_templated_using_declaration)
587 << R << FixItHint::CreateRemoval(R);
588
589 // Unfortunately, we have to bail out instead of recovering by
590 // ignoring the parameters, just in case the nested name specifier
591 // depends on the parameters.
592 return 0;
593 }
594
595 // "typename" keyword is allowed for identifiers only,
596 // because it may be a type definition.
597 if (HasTypenameKeyword && Name.getKind() != UnqualifiedId::IK_Identifier) {
598 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only)
599 << FixItHint::CreateRemoval(SourceRange(TypenameLoc));
600 // Proceed parsing, but reset the HasTypenameKeyword flag.
601 HasTypenameKeyword = false;
602 }
603
604 if (IsAliasDecl) {
605 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
606 MultiTemplateParamsArg TemplateParamsArg(
607 TemplateParams ? TemplateParams->data() : 0,
608 TemplateParams ? TemplateParams->size() : 0);
609 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
610 UsingLoc, Name, Attrs.getList(),
611 TypeAlias);
612 }
613
614 return Actions.ActOnUsingDeclaration(getCurScope(), AS,
615 /* HasUsingKeyword */ true, UsingLoc,
616 SS, Name, Attrs.getList(),
617 HasTypenameKeyword, TypenameLoc);
618 }
619
620 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
621 ///
622 /// [C++0x] static_assert-declaration:
623 /// static_assert ( constant-expression , string-literal ) ;
624 ///
625 /// [C11] static_assert-declaration:
626 /// _Static_assert ( constant-expression , string-literal ) ;
627 ///
ParseStaticAssertDeclaration(SourceLocation & DeclEnd)628 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
629 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
630 "Not a static_assert declaration");
631
632 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
633 Diag(Tok, diag::ext_c11_static_assert);
634 if (Tok.is(tok::kw_static_assert))
635 Diag(Tok, diag::warn_cxx98_compat_static_assert);
636
637 SourceLocation StaticAssertLoc = ConsumeToken();
638
639 BalancedDelimiterTracker T(*this, tok::l_paren);
640 if (T.consumeOpen()) {
641 Diag(Tok, diag::err_expected_lparen);
642 SkipMalformedDecl();
643 return 0;
644 }
645
646 ExprResult AssertExpr(ParseConstantExpression());
647 if (AssertExpr.isInvalid()) {
648 SkipMalformedDecl();
649 return 0;
650 }
651
652 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
653 return 0;
654
655 if (!isTokenStringLiteral()) {
656 Diag(Tok, diag::err_expected_string_literal)
657 << /*Source='static_assert'*/1;
658 SkipMalformedDecl();
659 return 0;
660 }
661
662 ExprResult AssertMessage(ParseStringLiteralExpression());
663 if (AssertMessage.isInvalid()) {
664 SkipMalformedDecl();
665 return 0;
666 }
667
668 T.consumeClose();
669
670 DeclEnd = Tok.getLocation();
671 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
672
673 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
674 AssertExpr.take(),
675 AssertMessage.take(),
676 T.getCloseLocation());
677 }
678
679 /// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
680 ///
681 /// 'decltype' ( expression )
682 /// 'decltype' ( 'auto' ) [C++1y]
683 ///
ParseDecltypeSpecifier(DeclSpec & DS)684 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
685 assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype))
686 && "Not a decltype specifier");
687
688 ExprResult Result;
689 SourceLocation StartLoc = Tok.getLocation();
690 SourceLocation EndLoc;
691
692 if (Tok.is(tok::annot_decltype)) {
693 Result = getExprAnnotation(Tok);
694 EndLoc = Tok.getAnnotationEndLoc();
695 ConsumeToken();
696 if (Result.isInvalid()) {
697 DS.SetTypeSpecError();
698 return EndLoc;
699 }
700 } else {
701 if (Tok.getIdentifierInfo()->isStr("decltype"))
702 Diag(Tok, diag::warn_cxx98_compat_decltype);
703
704 ConsumeToken();
705
706 BalancedDelimiterTracker T(*this, tok::l_paren);
707 if (T.expectAndConsume(diag::err_expected_lparen_after,
708 "decltype", tok::r_paren)) {
709 DS.SetTypeSpecError();
710 return T.getOpenLocation() == Tok.getLocation() ?
711 StartLoc : T.getOpenLocation();
712 }
713
714 // Check for C++1y 'decltype(auto)'.
715 if (Tok.is(tok::kw_auto)) {
716 // No need to disambiguate here: an expression can't start with 'auto',
717 // because the typename-specifier in a function-style cast operation can't
718 // be 'auto'.
719 Diag(Tok.getLocation(),
720 getLangOpts().CPlusPlus1y
721 ? diag::warn_cxx11_compat_decltype_auto_type_specifier
722 : diag::ext_decltype_auto_type_specifier);
723 ConsumeToken();
724 } else {
725 // Parse the expression
726
727 // C++11 [dcl.type.simple]p4:
728 // The operand of the decltype specifier is an unevaluated operand.
729 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
730 0, /*IsDecltype=*/true);
731 Result = ParseExpression();
732 if (Result.isInvalid()) {
733 DS.SetTypeSpecError();
734 if (SkipUntil(tok::r_paren, /*StopAtSemi=*/true,
735 /*DontConsume=*/true)) {
736 EndLoc = ConsumeParen();
737 } else {
738 if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
739 // Backtrack to get the location of the last token before the semi.
740 PP.RevertCachedTokens(2);
741 ConsumeToken(); // the semi.
742 EndLoc = ConsumeAnyToken();
743 assert(Tok.is(tok::semi));
744 } else {
745 EndLoc = Tok.getLocation();
746 }
747 }
748 return EndLoc;
749 }
750
751 Result = Actions.ActOnDecltypeExpression(Result.take());
752 }
753
754 // Match the ')'
755 T.consumeClose();
756 if (T.getCloseLocation().isInvalid()) {
757 DS.SetTypeSpecError();
758 // FIXME: this should return the location of the last token
759 // that was consumed (by "consumeClose()")
760 return T.getCloseLocation();
761 }
762
763 if (Result.isInvalid()) {
764 DS.SetTypeSpecError();
765 return T.getCloseLocation();
766 }
767
768 EndLoc = T.getCloseLocation();
769 }
770 assert(!Result.isInvalid());
771
772 const char *PrevSpec = 0;
773 unsigned DiagID;
774 // Check for duplicate type specifiers (e.g. "int decltype(a)").
775 if (Result.get()
776 ? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
777 DiagID, Result.release())
778 : DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
779 DiagID)) {
780 Diag(StartLoc, DiagID) << PrevSpec;
781 DS.SetTypeSpecError();
782 }
783 return EndLoc;
784 }
785
AnnotateExistingDecltypeSpecifier(const DeclSpec & DS,SourceLocation StartLoc,SourceLocation EndLoc)786 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
787 SourceLocation StartLoc,
788 SourceLocation EndLoc) {
789 // make sure we have a token we can turn into an annotation token
790 if (PP.isBacktrackEnabled())
791 PP.RevertCachedTokens(1);
792 else
793 PP.EnterToken(Tok);
794
795 Tok.setKind(tok::annot_decltype);
796 setExprAnnotation(Tok,
797 DS.getTypeSpecType() == TST_decltype ? DS.getRepAsExpr() :
798 DS.getTypeSpecType() == TST_decltype_auto ? ExprResult() :
799 ExprError());
800 Tok.setAnnotationEndLoc(EndLoc);
801 Tok.setLocation(StartLoc);
802 PP.AnnotateCachedTokens(Tok);
803 }
804
ParseUnderlyingTypeSpecifier(DeclSpec & DS)805 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
806 assert(Tok.is(tok::kw___underlying_type) &&
807 "Not an underlying type specifier");
808
809 SourceLocation StartLoc = ConsumeToken();
810 BalancedDelimiterTracker T(*this, tok::l_paren);
811 if (T.expectAndConsume(diag::err_expected_lparen_after,
812 "__underlying_type", tok::r_paren)) {
813 return;
814 }
815
816 TypeResult Result = ParseTypeName();
817 if (Result.isInvalid()) {
818 SkipUntil(tok::r_paren);
819 return;
820 }
821
822 // Match the ')'
823 T.consumeClose();
824 if (T.getCloseLocation().isInvalid())
825 return;
826
827 const char *PrevSpec = 0;
828 unsigned DiagID;
829 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
830 DiagID, Result.release()))
831 Diag(StartLoc, DiagID) << PrevSpec;
832 DS.setTypeofParensRange(T.getRange());
833 }
834
835 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
836 /// class name or decltype-specifier. Note that we only check that the result
837 /// names a type; semantic analysis will need to verify that the type names a
838 /// class. The result is either a type or null, depending on whether a type
839 /// name was found.
840 ///
841 /// base-type-specifier: [C++11 class.derived]
842 /// class-or-decltype
843 /// class-or-decltype: [C++11 class.derived]
844 /// nested-name-specifier[opt] class-name
845 /// decltype-specifier
846 /// class-name: [C++ class.name]
847 /// identifier
848 /// simple-template-id
849 ///
850 /// In C++98, instead of base-type-specifier, we have:
851 ///
852 /// ::[opt] nested-name-specifier[opt] class-name
ParseBaseTypeSpecifier(SourceLocation & BaseLoc,SourceLocation & EndLocation)853 Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
854 SourceLocation &EndLocation) {
855 // Ignore attempts to use typename
856 if (Tok.is(tok::kw_typename)) {
857 Diag(Tok, diag::err_expected_class_name_not_template)
858 << FixItHint::CreateRemoval(Tok.getLocation());
859 ConsumeToken();
860 }
861
862 // Parse optional nested-name-specifier
863 CXXScopeSpec SS;
864 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
865
866 BaseLoc = Tok.getLocation();
867
868 // Parse decltype-specifier
869 // tok == kw_decltype is just error recovery, it can only happen when SS
870 // isn't empty
871 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) {
872 if (SS.isNotEmpty())
873 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
874 << FixItHint::CreateRemoval(SS.getRange());
875 // Fake up a Declarator to use with ActOnTypeName.
876 DeclSpec DS(AttrFactory);
877
878 EndLocation = ParseDecltypeSpecifier(DS);
879
880 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
881 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
882 }
883
884 // Check whether we have a template-id that names a type.
885 if (Tok.is(tok::annot_template_id)) {
886 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
887 if (TemplateId->Kind == TNK_Type_template ||
888 TemplateId->Kind == TNK_Dependent_template_name) {
889 AnnotateTemplateIdTokenAsType();
890
891 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
892 ParsedType Type = getTypeAnnotation(Tok);
893 EndLocation = Tok.getAnnotationEndLoc();
894 ConsumeToken();
895
896 if (Type)
897 return Type;
898 return true;
899 }
900
901 // Fall through to produce an error below.
902 }
903
904 if (Tok.isNot(tok::identifier)) {
905 Diag(Tok, diag::err_expected_class_name);
906 return true;
907 }
908
909 IdentifierInfo *Id = Tok.getIdentifierInfo();
910 SourceLocation IdLoc = ConsumeToken();
911
912 if (Tok.is(tok::less)) {
913 // It looks the user intended to write a template-id here, but the
914 // template-name was wrong. Try to fix that.
915 TemplateNameKind TNK = TNK_Type_template;
916 TemplateTy Template;
917 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
918 &SS, Template, TNK)) {
919 Diag(IdLoc, diag::err_unknown_template_name)
920 << Id;
921 }
922
923 if (!Template)
924 return true;
925
926 // Form the template name
927 UnqualifiedId TemplateName;
928 TemplateName.setIdentifier(Id, IdLoc);
929
930 // Parse the full template-id, then turn it into a type.
931 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
932 TemplateName, true))
933 return true;
934 if (TNK == TNK_Dependent_template_name)
935 AnnotateTemplateIdTokenAsType();
936
937 // If we didn't end up with a typename token, there's nothing more we
938 // can do.
939 if (Tok.isNot(tok::annot_typename))
940 return true;
941
942 // Retrieve the type from the annotation token, consume that token, and
943 // return.
944 EndLocation = Tok.getAnnotationEndLoc();
945 ParsedType Type = getTypeAnnotation(Tok);
946 ConsumeToken();
947 return Type;
948 }
949
950 // We have an identifier; check whether it is actually a type.
951 IdentifierInfo *CorrectedII = 0;
952 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
953 false, ParsedType(),
954 /*IsCtorOrDtorName=*/false,
955 /*NonTrivialTypeSourceInfo=*/true,
956 &CorrectedII);
957 if (!Type) {
958 Diag(IdLoc, diag::err_expected_class_name);
959 return true;
960 }
961
962 // Consume the identifier.
963 EndLocation = IdLoc;
964
965 // Fake up a Declarator to use with ActOnTypeName.
966 DeclSpec DS(AttrFactory);
967 DS.SetRangeStart(IdLoc);
968 DS.SetRangeEnd(EndLocation);
969 DS.getTypeSpecScope() = SS;
970
971 const char *PrevSpec = 0;
972 unsigned DiagID;
973 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
974
975 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
976 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
977 }
978
ParseMicrosoftInheritanceClassAttributes(ParsedAttributes & attrs)979 void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
980 while (Tok.is(tok::kw___single_inheritance) ||
981 Tok.is(tok::kw___multiple_inheritance) ||
982 Tok.is(tok::kw___virtual_inheritance)) {
983 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
984 SourceLocation AttrNameLoc = ConsumeToken();
985 attrs.addNew(AttrName, AttrNameLoc, 0, AttrNameLoc, 0,
986 SourceLocation(), 0, 0, AttributeList::AS_GNU);
987 }
988 }
989
990 /// Determine whether the following tokens are valid after a type-specifier
991 /// which could be a standalone declaration. This will conservatively return
992 /// true if there's any doubt, and is appropriate for insert-';' fixits.
isValidAfterTypeSpecifier(bool CouldBeBitfield)993 bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
994 // This switch enumerates the valid "follow" set for type-specifiers.
995 switch (Tok.getKind()) {
996 default: break;
997 case tok::semi: // struct foo {...} ;
998 case tok::star: // struct foo {...} * P;
999 case tok::amp: // struct foo {...} & R = ...
1000 case tok::ampamp: // struct foo {...} && R = ...
1001 case tok::identifier: // struct foo {...} V ;
1002 case tok::r_paren: //(struct foo {...} ) {4}
1003 case tok::annot_cxxscope: // struct foo {...} a:: b;
1004 case tok::annot_typename: // struct foo {...} a ::b;
1005 case tok::annot_template_id: // struct foo {...} a<int> ::b;
1006 case tok::l_paren: // struct foo {...} ( x);
1007 case tok::comma: // __builtin_offsetof(struct foo{...} ,
1008 case tok::kw_operator: // struct foo operator ++() {...}
1009 return true;
1010 case tok::colon:
1011 return CouldBeBitfield; // enum E { ... } : 2;
1012 // Type qualifiers
1013 case tok::kw_const: // struct foo {...} const x;
1014 case tok::kw_volatile: // struct foo {...} volatile x;
1015 case tok::kw_restrict: // struct foo {...} restrict x;
1016 // Function specifiers
1017 // Note, no 'explicit'. An explicit function must be either a conversion
1018 // operator or a constructor. Either way, it can't have a return type.
1019 case tok::kw_inline: // struct foo inline f();
1020 case tok::kw_virtual: // struct foo virtual f();
1021 case tok::kw_friend: // struct foo friend f();
1022 // Storage-class specifiers
1023 case tok::kw_static: // struct foo {...} static x;
1024 case tok::kw_extern: // struct foo {...} extern x;
1025 case tok::kw_typedef: // struct foo {...} typedef x;
1026 case tok::kw_register: // struct foo {...} register x;
1027 case tok::kw_auto: // struct foo {...} auto x;
1028 case tok::kw_mutable: // struct foo {...} mutable x;
1029 case tok::kw_thread_local: // struct foo {...} thread_local x;
1030 case tok::kw_constexpr: // struct foo {...} constexpr x;
1031 // As shown above, type qualifiers and storage class specifiers absolutely
1032 // can occur after class specifiers according to the grammar. However,
1033 // almost no one actually writes code like this. If we see one of these,
1034 // it is much more likely that someone missed a semi colon and the
1035 // type/storage class specifier we're seeing is part of the *next*
1036 // intended declaration, as in:
1037 //
1038 // struct foo { ... }
1039 // typedef int X;
1040 //
1041 // We'd really like to emit a missing semicolon error instead of emitting
1042 // an error on the 'int' saying that you can't have two type specifiers in
1043 // the same declaration of X. Because of this, we look ahead past this
1044 // token to see if it's a type specifier. If so, we know the code is
1045 // otherwise invalid, so we can produce the expected semi error.
1046 if (!isKnownToBeTypeSpecifier(NextToken()))
1047 return true;
1048 break;
1049 case tok::r_brace: // struct bar { struct foo {...} }
1050 // Missing ';' at end of struct is accepted as an extension in C mode.
1051 if (!getLangOpts().CPlusPlus)
1052 return true;
1053 break;
1054 // C++11 attributes
1055 case tok::l_square: // enum E [[]] x
1056 // Note, no tok::kw_alignas here; alignas cannot appertain to a type.
1057 return getLangOpts().CPlusPlus11 && NextToken().is(tok::l_square);
1058 case tok::greater:
1059 // template<class T = class X>
1060 return getLangOpts().CPlusPlus;
1061 }
1062 return false;
1063 }
1064
1065 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
1066 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
1067 /// until we reach the start of a definition or see a token that
1068 /// cannot start a definition.
1069 ///
1070 /// class-specifier: [C++ class]
1071 /// class-head '{' member-specification[opt] '}'
1072 /// class-head '{' member-specification[opt] '}' attributes[opt]
1073 /// class-head:
1074 /// class-key identifier[opt] base-clause[opt]
1075 /// class-key nested-name-specifier identifier base-clause[opt]
1076 /// class-key nested-name-specifier[opt] simple-template-id
1077 /// base-clause[opt]
1078 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1079 /// [GNU] class-key attributes[opt] nested-name-specifier
1080 /// identifier base-clause[opt]
1081 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1082 /// simple-template-id base-clause[opt]
1083 /// class-key:
1084 /// 'class'
1085 /// 'struct'
1086 /// 'union'
1087 ///
1088 /// elaborated-type-specifier: [C++ dcl.type.elab]
1089 /// class-key ::[opt] nested-name-specifier[opt] identifier
1090 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1091 /// simple-template-id
1092 ///
1093 /// Note that the C++ class-specifier and elaborated-type-specifier,
1094 /// together, subsume the C99 struct-or-union-specifier:
1095 ///
1096 /// struct-or-union-specifier: [C99 6.7.2.1]
1097 /// struct-or-union identifier[opt] '{' struct-contents '}'
1098 /// struct-or-union identifier
1099 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1100 /// '}' attributes[opt]
1101 /// [GNU] struct-or-union attributes[opt] identifier
1102 /// struct-or-union:
1103 /// 'struct'
1104 /// 'union'
ParseClassSpecifier(tok::TokenKind TagTokKind,SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,bool EnteringContext,DeclSpecContext DSC,ParsedAttributesWithRange & Attributes)1105 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1106 SourceLocation StartLoc, DeclSpec &DS,
1107 const ParsedTemplateInfo &TemplateInfo,
1108 AccessSpecifier AS,
1109 bool EnteringContext, DeclSpecContext DSC,
1110 ParsedAttributesWithRange &Attributes) {
1111 DeclSpec::TST TagType;
1112 if (TagTokKind == tok::kw_struct)
1113 TagType = DeclSpec::TST_struct;
1114 else if (TagTokKind == tok::kw___interface)
1115 TagType = DeclSpec::TST_interface;
1116 else if (TagTokKind == tok::kw_class)
1117 TagType = DeclSpec::TST_class;
1118 else {
1119 assert(TagTokKind == tok::kw_union && "Not a class specifier");
1120 TagType = DeclSpec::TST_union;
1121 }
1122
1123 if (Tok.is(tok::code_completion)) {
1124 // Code completion for a struct, class, or union name.
1125 Actions.CodeCompleteTag(getCurScope(), TagType);
1126 return cutOffParsing();
1127 }
1128
1129 // C++03 [temp.explicit] 14.7.2/8:
1130 // The usual access checking rules do not apply to names used to specify
1131 // explicit instantiations.
1132 //
1133 // As an extension we do not perform access checking on the names used to
1134 // specify explicit specializations either. This is important to allow
1135 // specializing traits classes for private types.
1136 //
1137 // Note that we don't suppress if this turns out to be an elaborated
1138 // type specifier.
1139 bool shouldDelayDiagsInTag =
1140 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1141 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1142 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1143
1144 ParsedAttributesWithRange attrs(AttrFactory);
1145 // If attributes exist after tag, parse them.
1146 if (Tok.is(tok::kw___attribute))
1147 ParseGNUAttributes(attrs);
1148
1149 // If declspecs exist after tag, parse them.
1150 while (Tok.is(tok::kw___declspec))
1151 ParseMicrosoftDeclSpec(attrs);
1152
1153 // Parse inheritance specifiers.
1154 if (Tok.is(tok::kw___single_inheritance) ||
1155 Tok.is(tok::kw___multiple_inheritance) ||
1156 Tok.is(tok::kw___virtual_inheritance))
1157 ParseMicrosoftInheritanceClassAttributes(attrs);
1158
1159 // If C++0x attributes exist here, parse them.
1160 // FIXME: Are we consistent with the ordering of parsing of different
1161 // styles of attributes?
1162 MaybeParseCXX11Attributes(attrs);
1163
1164 // Source location used by FIXIT to insert misplaced
1165 // C++11 attributes
1166 SourceLocation AttrFixitLoc = Tok.getLocation();
1167
1168 if (TagType == DeclSpec::TST_struct &&
1169 !Tok.is(tok::identifier) &&
1170 Tok.getIdentifierInfo() &&
1171 (Tok.is(tok::kw___is_arithmetic) ||
1172 Tok.is(tok::kw___is_convertible) ||
1173 Tok.is(tok::kw___is_empty) ||
1174 Tok.is(tok::kw___is_floating_point) ||
1175 Tok.is(tok::kw___is_function) ||
1176 Tok.is(tok::kw___is_fundamental) ||
1177 Tok.is(tok::kw___is_integral) ||
1178 Tok.is(tok::kw___is_member_function_pointer) ||
1179 Tok.is(tok::kw___is_member_pointer) ||
1180 Tok.is(tok::kw___is_pod) ||
1181 Tok.is(tok::kw___is_pointer) ||
1182 Tok.is(tok::kw___is_same) ||
1183 Tok.is(tok::kw___is_scalar) ||
1184 Tok.is(tok::kw___is_signed) ||
1185 Tok.is(tok::kw___is_unsigned) ||
1186 Tok.is(tok::kw___is_void))) {
1187 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1188 // name of struct templates, but some are keywords in GCC >= 4.3
1189 // and Clang. Therefore, when we see the token sequence "struct
1190 // X", make X into a normal identifier rather than a keyword, to
1191 // allow libstdc++ 4.2 and libc++ to work properly.
1192 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
1193 Tok.setKind(tok::identifier);
1194 }
1195
1196 // Parse the (optional) nested-name-specifier.
1197 CXXScopeSpec &SS = DS.getTypeSpecScope();
1198 if (getLangOpts().CPlusPlus) {
1199 // "FOO : BAR" is not a potential typo for "FOO::BAR".
1200 ColonProtectionRAIIObject X(*this);
1201
1202 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1203 DS.SetTypeSpecError();
1204 if (SS.isSet())
1205 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
1206 Diag(Tok, diag::err_expected_ident);
1207 }
1208
1209 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1210
1211 // Parse the (optional) class name or simple-template-id.
1212 IdentifierInfo *Name = 0;
1213 SourceLocation NameLoc;
1214 TemplateIdAnnotation *TemplateId = 0;
1215 if (Tok.is(tok::identifier)) {
1216 Name = Tok.getIdentifierInfo();
1217 NameLoc = ConsumeToken();
1218
1219 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1220 // The name was supposed to refer to a template, but didn't.
1221 // Eat the template argument list and try to continue parsing this as
1222 // a class (or template thereof).
1223 TemplateArgList TemplateArgs;
1224 SourceLocation LAngleLoc, RAngleLoc;
1225 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
1226 true, LAngleLoc,
1227 TemplateArgs, RAngleLoc)) {
1228 // We couldn't parse the template argument list at all, so don't
1229 // try to give any location information for the list.
1230 LAngleLoc = RAngleLoc = SourceLocation();
1231 }
1232
1233 Diag(NameLoc, diag::err_explicit_spec_non_template)
1234 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1235 << (TagType == DeclSpec::TST_class? 0
1236 : TagType == DeclSpec::TST_struct? 1
1237 : TagType == DeclSpec::TST_interface? 2
1238 : 3)
1239 << Name
1240 << SourceRange(LAngleLoc, RAngleLoc);
1241
1242 // Strip off the last template parameter list if it was empty, since
1243 // we've removed its template argument list.
1244 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1245 if (TemplateParams && TemplateParams->size() > 1) {
1246 TemplateParams->pop_back();
1247 } else {
1248 TemplateParams = 0;
1249 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1250 = ParsedTemplateInfo::NonTemplate;
1251 }
1252 } else if (TemplateInfo.Kind
1253 == ParsedTemplateInfo::ExplicitInstantiation) {
1254 // Pretend this is just a forward declaration.
1255 TemplateParams = 0;
1256 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1257 = ParsedTemplateInfo::NonTemplate;
1258 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
1259 = SourceLocation();
1260 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
1261 = SourceLocation();
1262 }
1263 }
1264 } else if (Tok.is(tok::annot_template_id)) {
1265 TemplateId = takeTemplateIdAnnotation(Tok);
1266 NameLoc = ConsumeToken();
1267
1268 if (TemplateId->Kind != TNK_Type_template &&
1269 TemplateId->Kind != TNK_Dependent_template_name) {
1270 // The template-name in the simple-template-id refers to
1271 // something other than a class template. Give an appropriate
1272 // error message and skip to the ';'.
1273 SourceRange Range(NameLoc);
1274 if (SS.isNotEmpty())
1275 Range.setBegin(SS.getBeginLoc());
1276
1277 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1278 << TemplateId->Name << static_cast<int>(TemplateId->Kind) << Range;
1279
1280 DS.SetTypeSpecError();
1281 SkipUntil(tok::semi, false, true);
1282 return;
1283 }
1284 }
1285
1286 // There are four options here.
1287 // - If we are in a trailing return type, this is always just a reference,
1288 // and we must not try to parse a definition. For instance,
1289 // [] () -> struct S { };
1290 // does not define a type.
1291 // - If we have 'struct foo {...', 'struct foo :...',
1292 // 'struct foo final :' or 'struct foo final {', then this is a definition.
1293 // - If we have 'struct foo;', then this is either a forward declaration
1294 // or a friend declaration, which have to be treated differently.
1295 // - Otherwise we have something like 'struct foo xyz', a reference.
1296 //
1297 // We also detect these erroneous cases to provide better diagnostic for
1298 // C++11 attributes parsing.
1299 // - attributes follow class name:
1300 // struct foo [[]] {};
1301 // - attributes appear before or after 'final':
1302 // struct foo [[]] final [[]] {};
1303 //
1304 // However, in type-specifier-seq's, things look like declarations but are
1305 // just references, e.g.
1306 // new struct s;
1307 // or
1308 // &T::operator struct s;
1309 // For these, DSC is DSC_type_specifier.
1310
1311 // If there are attributes after class name, parse them.
1312 MaybeParseCXX11Attributes(Attributes);
1313
1314 Sema::TagUseKind TUK;
1315 if (DSC == DSC_trailing)
1316 TUK = Sema::TUK_Reference;
1317 else if (Tok.is(tok::l_brace) ||
1318 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1319 (isCXX11FinalKeyword() &&
1320 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1321 if (DS.isFriendSpecified()) {
1322 // C++ [class.friend]p2:
1323 // A class shall not be defined in a friend declaration.
1324 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1325 << SourceRange(DS.getFriendSpecLoc());
1326
1327 // Skip everything up to the semicolon, so that this looks like a proper
1328 // friend class (or template thereof) declaration.
1329 SkipUntil(tok::semi, true, true);
1330 TUK = Sema::TUK_Friend;
1331 } else {
1332 // Okay, this is a class definition.
1333 TUK = Sema::TUK_Definition;
1334 }
1335 } else if (isCXX11FinalKeyword() && (NextToken().is(tok::l_square) ||
1336 NextToken().is(tok::kw_alignas))) {
1337 // We can't tell if this is a definition or reference
1338 // until we skipped the 'final' and C++11 attribute specifiers.
1339 TentativeParsingAction PA(*this);
1340
1341 // Skip the 'final' keyword.
1342 ConsumeToken();
1343
1344 // Skip C++11 attribute specifiers.
1345 while (true) {
1346 if (Tok.is(tok::l_square) && NextToken().is(tok::l_square)) {
1347 ConsumeBracket();
1348 if (!SkipUntil(tok::r_square))
1349 break;
1350 } else if (Tok.is(tok::kw_alignas) && NextToken().is(tok::l_paren)) {
1351 ConsumeToken();
1352 ConsumeParen();
1353 if (!SkipUntil(tok::r_paren))
1354 break;
1355 } else {
1356 break;
1357 }
1358 }
1359
1360 if (Tok.is(tok::l_brace) || Tok.is(tok::colon))
1361 TUK = Sema::TUK_Definition;
1362 else
1363 TUK = Sema::TUK_Reference;
1364
1365 PA.Revert();
1366 } else if (DSC != DSC_type_specifier &&
1367 (Tok.is(tok::semi) ||
1368 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1369 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1370 if (Tok.isNot(tok::semi)) {
1371 // A semicolon was missing after this declaration. Diagnose and recover.
1372 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1373 DeclSpec::getSpecifierName(TagType));
1374 PP.EnterToken(Tok);
1375 Tok.setKind(tok::semi);
1376 }
1377 } else
1378 TUK = Sema::TUK_Reference;
1379
1380 // Forbid misplaced attributes. In cases of a reference, we pass attributes
1381 // to caller to handle.
1382 if (TUK != Sema::TUK_Reference) {
1383 // If this is not a reference, then the only possible
1384 // valid place for C++11 attributes to appear here
1385 // is between class-key and class-name. If there are
1386 // any attributes after class-name, we try a fixit to move
1387 // them to the right place.
1388 SourceRange AttrRange = Attributes.Range;
1389 if (AttrRange.isValid()) {
1390 Diag(AttrRange.getBegin(), diag::err_attributes_not_allowed)
1391 << AttrRange
1392 << FixItHint::CreateInsertionFromRange(AttrFixitLoc,
1393 CharSourceRange(AttrRange, true))
1394 << FixItHint::CreateRemoval(AttrRange);
1395
1396 // Recover by adding misplaced attributes to the attribute list
1397 // of the class so they can be applied on the class later.
1398 attrs.takeAllFrom(Attributes);
1399 }
1400 }
1401
1402 // If this is an elaborated type specifier, and we delayed
1403 // diagnostics before, just merge them into the current pool.
1404 if (shouldDelayDiagsInTag) {
1405 diagsFromTag.done();
1406 if (TUK == Sema::TUK_Reference)
1407 diagsFromTag.redelay();
1408 }
1409
1410 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1411 TUK != Sema::TUK_Definition)) {
1412 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1413 // We have a declaration or reference to an anonymous class.
1414 Diag(StartLoc, diag::err_anon_type_definition)
1415 << DeclSpec::getSpecifierName(TagType);
1416 }
1417
1418 SkipUntil(tok::comma, true);
1419 return;
1420 }
1421
1422 // Create the tag portion of the class or class template.
1423 DeclResult TagOrTempResult = true; // invalid
1424 TypeResult TypeResult = true; // invalid
1425
1426 bool Owned = false;
1427 if (TemplateId) {
1428 // Explicit specialization, class template partial specialization,
1429 // or explicit instantiation.
1430 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1431 TemplateId->NumArgs);
1432 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1433 TUK == Sema::TUK_Declaration) {
1434 // This is an explicit instantiation of a class template.
1435 ProhibitAttributes(attrs);
1436
1437 TagOrTempResult
1438 = Actions.ActOnExplicitInstantiation(getCurScope(),
1439 TemplateInfo.ExternLoc,
1440 TemplateInfo.TemplateLoc,
1441 TagType,
1442 StartLoc,
1443 SS,
1444 TemplateId->Template,
1445 TemplateId->TemplateNameLoc,
1446 TemplateId->LAngleLoc,
1447 TemplateArgsPtr,
1448 TemplateId->RAngleLoc,
1449 attrs.getList());
1450
1451 // Friend template-ids are treated as references unless
1452 // they have template headers, in which case they're ill-formed
1453 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1454 // We diagnose this error in ActOnClassTemplateSpecialization.
1455 } else if (TUK == Sema::TUK_Reference ||
1456 (TUK == Sema::TUK_Friend &&
1457 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1458 ProhibitAttributes(attrs);
1459 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1460 TemplateId->SS,
1461 TemplateId->TemplateKWLoc,
1462 TemplateId->Template,
1463 TemplateId->TemplateNameLoc,
1464 TemplateId->LAngleLoc,
1465 TemplateArgsPtr,
1466 TemplateId->RAngleLoc);
1467 } else {
1468 // This is an explicit specialization or a class template
1469 // partial specialization.
1470 TemplateParameterLists FakedParamLists;
1471 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1472 // This looks like an explicit instantiation, because we have
1473 // something like
1474 //
1475 // template class Foo<X>
1476 //
1477 // but it actually has a definition. Most likely, this was
1478 // meant to be an explicit specialization, but the user forgot
1479 // the '<>' after 'template'.
1480 // It this is friend declaration however, since it cannot have a
1481 // template header, it is most likely that the user meant to
1482 // remove the 'template' keyword.
1483 assert((TUK == Sema::TUK_Definition || TUK == Sema::TUK_Friend) &&
1484 "Expected a definition here");
1485
1486 if (TUK == Sema::TUK_Friend) {
1487 Diag(DS.getFriendSpecLoc(),
1488 diag::err_friend_explicit_instantiation);
1489 TemplateParams = 0;
1490 } else {
1491 SourceLocation LAngleLoc
1492 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1493 Diag(TemplateId->TemplateNameLoc,
1494 diag::err_explicit_instantiation_with_definition)
1495 << SourceRange(TemplateInfo.TemplateLoc)
1496 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1497
1498 // Create a fake template parameter list that contains only
1499 // "template<>", so that we treat this construct as a class
1500 // template specialization.
1501 FakedParamLists.push_back(
1502 Actions.ActOnTemplateParameterList(0, SourceLocation(),
1503 TemplateInfo.TemplateLoc,
1504 LAngleLoc,
1505 0, 0,
1506 LAngleLoc));
1507 TemplateParams = &FakedParamLists;
1508 }
1509 }
1510
1511 // Build the class template specialization.
1512 TagOrTempResult
1513 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
1514 StartLoc, DS.getModulePrivateSpecLoc(), SS,
1515 TemplateId->Template,
1516 TemplateId->TemplateNameLoc,
1517 TemplateId->LAngleLoc,
1518 TemplateArgsPtr,
1519 TemplateId->RAngleLoc,
1520 attrs.getList(),
1521 MultiTemplateParamsArg(
1522 TemplateParams? &(*TemplateParams)[0] : 0,
1523 TemplateParams? TemplateParams->size() : 0));
1524 }
1525 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1526 TUK == Sema::TUK_Declaration) {
1527 // Explicit instantiation of a member of a class template
1528 // specialization, e.g.,
1529 //
1530 // template struct Outer<int>::Inner;
1531 //
1532 ProhibitAttributes(attrs);
1533
1534 TagOrTempResult
1535 = Actions.ActOnExplicitInstantiation(getCurScope(),
1536 TemplateInfo.ExternLoc,
1537 TemplateInfo.TemplateLoc,
1538 TagType, StartLoc, SS, Name,
1539 NameLoc, attrs.getList());
1540 } else if (TUK == Sema::TUK_Friend &&
1541 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1542 ProhibitAttributes(attrs);
1543
1544 TagOrTempResult =
1545 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1546 TagType, StartLoc, SS,
1547 Name, NameLoc, attrs.getList(),
1548 MultiTemplateParamsArg(
1549 TemplateParams? &(*TemplateParams)[0] : 0,
1550 TemplateParams? TemplateParams->size() : 0));
1551 } else {
1552 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1553 ProhibitAttributes(attrs);
1554
1555 if (TUK == Sema::TUK_Definition &&
1556 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1557 // If the declarator-id is not a template-id, issue a diagnostic and
1558 // recover by ignoring the 'template' keyword.
1559 Diag(Tok, diag::err_template_defn_explicit_instantiation)
1560 << 1 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
1561 TemplateParams = 0;
1562 }
1563
1564 bool IsDependent = false;
1565
1566 // Don't pass down template parameter lists if this is just a tag
1567 // reference. For example, we don't need the template parameters here:
1568 // template <class T> class A *makeA(T t);
1569 MultiTemplateParamsArg TParams;
1570 if (TUK != Sema::TUK_Reference && TemplateParams)
1571 TParams =
1572 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1573
1574 // Declaration or definition of a class type
1575 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1576 SS, Name, NameLoc, attrs.getList(), AS,
1577 DS.getModulePrivateSpecLoc(),
1578 TParams, Owned, IsDependent,
1579 SourceLocation(), false,
1580 clang::TypeResult());
1581
1582 // If ActOnTag said the type was dependent, try again with the
1583 // less common call.
1584 if (IsDependent) {
1585 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1586 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1587 SS, Name, StartLoc, NameLoc);
1588 }
1589 }
1590
1591 // If there is a body, parse it and inform the actions module.
1592 if (TUK == Sema::TUK_Definition) {
1593 assert(Tok.is(tok::l_brace) ||
1594 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1595 isCXX11FinalKeyword());
1596 if (getLangOpts().CPlusPlus)
1597 ParseCXXMemberSpecification(StartLoc, AttrFixitLoc, attrs, TagType,
1598 TagOrTempResult.get());
1599 else
1600 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1601 }
1602
1603 const char *PrevSpec = 0;
1604 unsigned DiagID;
1605 bool Result;
1606 if (!TypeResult.isInvalid()) {
1607 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1608 NameLoc.isValid() ? NameLoc : StartLoc,
1609 PrevSpec, DiagID, TypeResult.get());
1610 } else if (!TagOrTempResult.isInvalid()) {
1611 Result = DS.SetTypeSpecType(TagType, StartLoc,
1612 NameLoc.isValid() ? NameLoc : StartLoc,
1613 PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1614 } else {
1615 DS.SetTypeSpecError();
1616 return;
1617 }
1618
1619 if (Result)
1620 Diag(StartLoc, DiagID) << PrevSpec;
1621
1622 // At this point, we've successfully parsed a class-specifier in 'definition'
1623 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1624 // going to look at what comes after it to improve error recovery. If an
1625 // impossible token occurs next, we assume that the programmer forgot a ; at
1626 // the end of the declaration and recover that way.
1627 //
1628 // Also enforce C++ [temp]p3:
1629 // In a template-declaration which defines a class, no declarator
1630 // is permitted.
1631 if (TUK == Sema::TUK_Definition &&
1632 (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
1633 if (Tok.isNot(tok::semi)) {
1634 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1635 DeclSpec::getSpecifierName(TagType));
1636 // Push this token back into the preprocessor and change our current token
1637 // to ';' so that the rest of the code recovers as though there were an
1638 // ';' after the definition.
1639 PP.EnterToken(Tok);
1640 Tok.setKind(tok::semi);
1641 }
1642 }
1643 }
1644
1645 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1646 ///
1647 /// base-clause : [C++ class.derived]
1648 /// ':' base-specifier-list
1649 /// base-specifier-list:
1650 /// base-specifier '...'[opt]
1651 /// base-specifier-list ',' base-specifier '...'[opt]
ParseBaseClause(Decl * ClassDecl)1652 void Parser::ParseBaseClause(Decl *ClassDecl) {
1653 assert(Tok.is(tok::colon) && "Not a base clause");
1654 ConsumeToken();
1655
1656 // Build up an array of parsed base specifiers.
1657 SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1658
1659 while (true) {
1660 // Parse a base-specifier.
1661 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1662 if (Result.isInvalid()) {
1663 // Skip the rest of this base specifier, up until the comma or
1664 // opening brace.
1665 SkipUntil(tok::comma, tok::l_brace, true, true);
1666 } else {
1667 // Add this to our array of base specifiers.
1668 BaseInfo.push_back(Result.get());
1669 }
1670
1671 // If the next token is a comma, consume it and keep reading
1672 // base-specifiers.
1673 if (Tok.isNot(tok::comma)) break;
1674
1675 // Consume the comma.
1676 ConsumeToken();
1677 }
1678
1679 // Attach the base specifiers
1680 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1681 }
1682
1683 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1684 /// one entry in the base class list of a class specifier, for example:
1685 /// class foo : public bar, virtual private baz {
1686 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1687 ///
1688 /// base-specifier: [C++ class.derived]
1689 /// attribute-specifier-seq[opt] base-type-specifier
1690 /// attribute-specifier-seq[opt] 'virtual' access-specifier[opt]
1691 /// base-type-specifier
1692 /// attribute-specifier-seq[opt] access-specifier 'virtual'[opt]
1693 /// base-type-specifier
ParseBaseSpecifier(Decl * ClassDecl)1694 Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1695 bool IsVirtual = false;
1696 SourceLocation StartLoc = Tok.getLocation();
1697
1698 ParsedAttributesWithRange Attributes(AttrFactory);
1699 MaybeParseCXX11Attributes(Attributes);
1700
1701 // Parse the 'virtual' keyword.
1702 if (Tok.is(tok::kw_virtual)) {
1703 ConsumeToken();
1704 IsVirtual = true;
1705 }
1706
1707 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1708
1709 // Parse an (optional) access specifier.
1710 AccessSpecifier Access = getAccessSpecifierIfPresent();
1711 if (Access != AS_none)
1712 ConsumeToken();
1713
1714 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1715
1716 // Parse the 'virtual' keyword (again!), in case it came after the
1717 // access specifier.
1718 if (Tok.is(tok::kw_virtual)) {
1719 SourceLocation VirtualLoc = ConsumeToken();
1720 if (IsVirtual) {
1721 // Complain about duplicate 'virtual'
1722 Diag(VirtualLoc, diag::err_dup_virtual)
1723 << FixItHint::CreateRemoval(VirtualLoc);
1724 }
1725
1726 IsVirtual = true;
1727 }
1728
1729 CheckMisplacedCXX11Attribute(Attributes, StartLoc);
1730
1731 // Parse the class-name.
1732 SourceLocation EndLocation;
1733 SourceLocation BaseLoc;
1734 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
1735 if (BaseType.isInvalid())
1736 return true;
1737
1738 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1739 // actually part of the base-specifier-list grammar productions, but we
1740 // parse it here for convenience.
1741 SourceLocation EllipsisLoc;
1742 if (Tok.is(tok::ellipsis))
1743 EllipsisLoc = ConsumeToken();
1744
1745 // Find the complete source range for the base-specifier.
1746 SourceRange Range(StartLoc, EndLocation);
1747
1748 // Notify semantic analysis that we have parsed a complete
1749 // base-specifier.
1750 return Actions.ActOnBaseSpecifier(ClassDecl, Range, Attributes, IsVirtual,
1751 Access, BaseType.get(), BaseLoc,
1752 EllipsisLoc);
1753 }
1754
1755 /// getAccessSpecifierIfPresent - Determine whether the next token is
1756 /// a C++ access-specifier.
1757 ///
1758 /// access-specifier: [C++ class.derived]
1759 /// 'private'
1760 /// 'protected'
1761 /// 'public'
getAccessSpecifierIfPresent() const1762 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1763 switch (Tok.getKind()) {
1764 default: return AS_none;
1765 case tok::kw_private: return AS_private;
1766 case tok::kw_protected: return AS_protected;
1767 case tok::kw_public: return AS_public;
1768 }
1769 }
1770
1771 /// \brief If the given declarator has any parts for which parsing has to be
1772 /// delayed, e.g., default arguments, create a late-parsed method declaration
1773 /// record to handle the parsing at the end of the class definition.
HandleMemberFunctionDeclDelays(Declarator & DeclaratorInfo,Decl * ThisDecl)1774 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
1775 Decl *ThisDecl) {
1776 // We just declared a member function. If this member function
1777 // has any default arguments, we'll need to parse them later.
1778 LateParsedMethodDeclaration *LateMethod = 0;
1779 DeclaratorChunk::FunctionTypeInfo &FTI
1780 = DeclaratorInfo.getFunctionTypeInfo();
1781
1782 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1783 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1784 if (!LateMethod) {
1785 // Push this method onto the stack of late-parsed method
1786 // declarations.
1787 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1788 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1789 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1790
1791 // Add all of the parameters prior to this one (they don't
1792 // have default arguments).
1793 LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1794 for (unsigned I = 0; I < ParamIdx; ++I)
1795 LateMethod->DefaultArgs.push_back(
1796 LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1797 }
1798
1799 // Add this parameter to the list of parameters (it may or may
1800 // not have a default argument).
1801 LateMethod->DefaultArgs.push_back(
1802 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1803 FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1804 }
1805 }
1806 }
1807
1808 /// isCXX11VirtSpecifier - Determine whether the given token is a C++11
1809 /// virt-specifier.
1810 ///
1811 /// virt-specifier:
1812 /// override
1813 /// final
isCXX11VirtSpecifier(const Token & Tok) const1814 VirtSpecifiers::Specifier Parser::isCXX11VirtSpecifier(const Token &Tok) const {
1815 if (!getLangOpts().CPlusPlus)
1816 return VirtSpecifiers::VS_None;
1817
1818 if (Tok.is(tok::identifier)) {
1819 IdentifierInfo *II = Tok.getIdentifierInfo();
1820
1821 // Initialize the contextual keywords.
1822 if (!Ident_final) {
1823 Ident_final = &PP.getIdentifierTable().get("final");
1824 Ident_override = &PP.getIdentifierTable().get("override");
1825 }
1826
1827 if (II == Ident_override)
1828 return VirtSpecifiers::VS_Override;
1829
1830 if (II == Ident_final)
1831 return VirtSpecifiers::VS_Final;
1832 }
1833
1834 return VirtSpecifiers::VS_None;
1835 }
1836
1837 /// ParseOptionalCXX11VirtSpecifierSeq - Parse a virt-specifier-seq.
1838 ///
1839 /// virt-specifier-seq:
1840 /// virt-specifier
1841 /// virt-specifier-seq virt-specifier
ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers & VS,bool IsInterface)1842 void Parser::ParseOptionalCXX11VirtSpecifierSeq(VirtSpecifiers &VS,
1843 bool IsInterface) {
1844 while (true) {
1845 VirtSpecifiers::Specifier Specifier = isCXX11VirtSpecifier();
1846 if (Specifier == VirtSpecifiers::VS_None)
1847 return;
1848
1849 // C++ [class.mem]p8:
1850 // A virt-specifier-seq shall contain at most one of each virt-specifier.
1851 const char *PrevSpec = 0;
1852 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1853 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1854 << PrevSpec
1855 << FixItHint::CreateRemoval(Tok.getLocation());
1856
1857 if (IsInterface && Specifier == VirtSpecifiers::VS_Final) {
1858 Diag(Tok.getLocation(), diag::err_override_control_interface)
1859 << VirtSpecifiers::getSpecifierName(Specifier);
1860 } else {
1861 Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
1862 diag::warn_cxx98_compat_override_control_keyword :
1863 diag::ext_override_control_keyword)
1864 << VirtSpecifiers::getSpecifierName(Specifier);
1865 }
1866 ConsumeToken();
1867 }
1868 }
1869
1870 /// isCXX11FinalKeyword - Determine whether the next token is a C++11
1871 /// contextual 'final' keyword.
isCXX11FinalKeyword() const1872 bool Parser::isCXX11FinalKeyword() const {
1873 if (!getLangOpts().CPlusPlus)
1874 return false;
1875
1876 if (!Tok.is(tok::identifier))
1877 return false;
1878
1879 // Initialize the contextual keywords.
1880 if (!Ident_final) {
1881 Ident_final = &PP.getIdentifierTable().get("final");
1882 Ident_override = &PP.getIdentifierTable().get("override");
1883 }
1884
1885 return Tok.getIdentifierInfo() == Ident_final;
1886 }
1887
1888 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1889 ///
1890 /// member-declaration:
1891 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
1892 /// function-definition ';'[opt]
1893 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1894 /// using-declaration [TODO]
1895 /// [C++0x] static_assert-declaration
1896 /// template-declaration
1897 /// [GNU] '__extension__' member-declaration
1898 ///
1899 /// member-declarator-list:
1900 /// member-declarator
1901 /// member-declarator-list ',' member-declarator
1902 ///
1903 /// member-declarator:
1904 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
1905 /// declarator constant-initializer[opt]
1906 /// [C++11] declarator brace-or-equal-initializer[opt]
1907 /// identifier[opt] ':' constant-expression
1908 ///
1909 /// virt-specifier-seq:
1910 /// virt-specifier
1911 /// virt-specifier-seq virt-specifier
1912 ///
1913 /// virt-specifier:
1914 /// override
1915 /// final
1916 ///
1917 /// pure-specifier:
1918 /// '= 0'
1919 ///
1920 /// constant-initializer:
1921 /// '=' constant-expression
1922 ///
ParseCXXClassMemberDeclaration(AccessSpecifier AS,AttributeList * AccessAttrs,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject * TemplateDiags)1923 void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1924 AttributeList *AccessAttrs,
1925 const ParsedTemplateInfo &TemplateInfo,
1926 ParsingDeclRAIIObject *TemplateDiags) {
1927 if (Tok.is(tok::at)) {
1928 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1929 Diag(Tok, diag::err_at_defs_cxx);
1930 else
1931 Diag(Tok, diag::err_at_in_class);
1932
1933 ConsumeToken();
1934 SkipUntil(tok::r_brace);
1935 return;
1936 }
1937
1938 // Access declarations.
1939 bool MalformedTypeSpec = false;
1940 if (!TemplateInfo.Kind &&
1941 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))) {
1942 if (TryAnnotateCXXScopeToken())
1943 MalformedTypeSpec = true;
1944
1945 bool isAccessDecl;
1946 if (Tok.isNot(tok::annot_cxxscope))
1947 isAccessDecl = false;
1948 else if (NextToken().is(tok::identifier))
1949 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1950 else
1951 isAccessDecl = NextToken().is(tok::kw_operator);
1952
1953 if (isAccessDecl) {
1954 // Collect the scope specifier token we annotated earlier.
1955 CXXScopeSpec SS;
1956 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1957 /*EnteringContext=*/false);
1958
1959 // Try to parse an unqualified-id.
1960 SourceLocation TemplateKWLoc;
1961 UnqualifiedId Name;
1962 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(),
1963 TemplateKWLoc, Name)) {
1964 SkipUntil(tok::semi);
1965 return;
1966 }
1967
1968 // TODO: recover from mistakenly-qualified operator declarations.
1969 if (ExpectAndConsume(tok::semi,
1970 diag::err_expected_semi_after,
1971 "access declaration",
1972 tok::semi))
1973 return;
1974
1975 Actions.ActOnUsingDeclaration(getCurScope(), AS,
1976 /* HasUsingKeyword */ false,
1977 SourceLocation(),
1978 SS, Name,
1979 /* AttrList */ 0,
1980 /* HasTypenameKeyword */ false,
1981 SourceLocation());
1982 return;
1983 }
1984 }
1985
1986 // static_assert-declaration
1987 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1988 // FIXME: Check for templates
1989 SourceLocation DeclEnd;
1990 ParseStaticAssertDeclaration(DeclEnd);
1991 return;
1992 }
1993
1994 if (Tok.is(tok::kw_template)) {
1995 assert(!TemplateInfo.TemplateParams &&
1996 "Nested template improperly parsed?");
1997 SourceLocation DeclEnd;
1998 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1999 AS, AccessAttrs);
2000 return;
2001 }
2002
2003 // Handle: member-declaration ::= '__extension__' member-declaration
2004 if (Tok.is(tok::kw___extension__)) {
2005 // __extension__ silences extension warnings in the subexpression.
2006 ExtensionRAIIObject O(Diags); // Use RAII to do this.
2007 ConsumeToken();
2008 return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
2009 TemplateInfo, TemplateDiags);
2010 }
2011
2012 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
2013 // is a bitfield.
2014 ColonProtectionRAIIObject X(*this);
2015
2016 ParsedAttributesWithRange attrs(AttrFactory);
2017 ParsedAttributesWithRange FnAttrs(AttrFactory);
2018 // Optional C++11 attribute-specifier
2019 MaybeParseCXX11Attributes(attrs);
2020 // We need to keep these attributes for future diagnostic
2021 // before they are taken over by declaration specifier.
2022 FnAttrs.addAll(attrs.getList());
2023 FnAttrs.Range = attrs.Range;
2024
2025 MaybeParseMicrosoftAttributes(attrs);
2026
2027 if (Tok.is(tok::kw_using)) {
2028 ProhibitAttributes(attrs);
2029
2030 // Eat 'using'.
2031 SourceLocation UsingLoc = ConsumeToken();
2032
2033 if (Tok.is(tok::kw_namespace)) {
2034 Diag(UsingLoc, diag::err_using_namespace_in_class);
2035 SkipUntil(tok::semi, true, true);
2036 } else {
2037 SourceLocation DeclEnd;
2038 // Otherwise, it must be a using-declaration or an alias-declaration.
2039 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
2040 UsingLoc, DeclEnd, AS);
2041 }
2042 return;
2043 }
2044
2045 // Hold late-parsed attributes so we can attach a Decl to them later.
2046 LateParsedAttrList CommonLateParsedAttrs;
2047
2048 // decl-specifier-seq:
2049 // Parse the common declaration-specifiers piece.
2050 ParsingDeclSpec DS(*this, TemplateDiags);
2051 DS.takeAttributesFrom(attrs);
2052 if (MalformedTypeSpec)
2053 DS.SetTypeSpecError();
2054 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class,
2055 &CommonLateParsedAttrs);
2056
2057 MultiTemplateParamsArg TemplateParams(
2058 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
2059 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
2060
2061 if (Tok.is(tok::semi)) {
2062 ConsumeToken();
2063
2064 if (DS.isFriendSpecified())
2065 ProhibitAttributes(FnAttrs);
2066
2067 Decl *TheDecl =
2068 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
2069 DS.complete(TheDecl);
2070 return;
2071 }
2072
2073 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
2074 VirtSpecifiers VS;
2075
2076 // Hold late-parsed attributes so we can attach a Decl to them later.
2077 LateParsedAttrList LateParsedAttrs;
2078
2079 SourceLocation EqualLoc;
2080 bool HasInitializer = false;
2081 ExprResult Init;
2082 if (Tok.isNot(tok::colon)) {
2083 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
2084 ColonProtectionRAIIObject X(*this);
2085
2086 // Parse the first declarator.
2087 ParseDeclarator(DeclaratorInfo);
2088 // Error parsing the declarator?
2089 if (!DeclaratorInfo.hasName()) {
2090 // If so, skip until the semi-colon or a }.
2091 SkipUntil(tok::r_brace, true, true);
2092 if (Tok.is(tok::semi))
2093 ConsumeToken();
2094 return;
2095 }
2096
2097 ParseOptionalCXX11VirtSpecifierSeq(VS, getCurrentClass().IsInterface);
2098
2099 // If attributes exist after the declarator, but before an '{', parse them.
2100 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2101
2102 // MSVC permits pure specifier on inline functions declared at class scope.
2103 // Hence check for =0 before checking for function definition.
2104 if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) &&
2105 DeclaratorInfo.isFunctionDeclarator() &&
2106 NextToken().is(tok::numeric_constant)) {
2107 EqualLoc = ConsumeToken();
2108 Init = ParseInitializer();
2109 if (Init.isInvalid())
2110 SkipUntil(tok::comma, true, true);
2111 else
2112 HasInitializer = true;
2113 }
2114
2115 FunctionDefinitionKind DefinitionKind = FDK_Declaration;
2116 // function-definition:
2117 //
2118 // In C++11, a non-function declarator followed by an open brace is a
2119 // braced-init-list for an in-class member initialization, not an
2120 // erroneous function definition.
2121 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus11) {
2122 DefinitionKind = FDK_Definition;
2123 } else if (DeclaratorInfo.isFunctionDeclarator()) {
2124 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
2125 DefinitionKind = FDK_Definition;
2126 } else if (Tok.is(tok::equal)) {
2127 const Token &KW = NextToken();
2128 if (KW.is(tok::kw_default))
2129 DefinitionKind = FDK_Defaulted;
2130 else if (KW.is(tok::kw_delete))
2131 DefinitionKind = FDK_Deleted;
2132 }
2133 }
2134
2135 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2136 // to a friend declaration, that declaration shall be a definition.
2137 if (DeclaratorInfo.isFunctionDeclarator() &&
2138 DefinitionKind != FDK_Definition && DS.isFriendSpecified()) {
2139 // Diagnose attributes that appear before decl specifier:
2140 // [[]] friend int foo();
2141 ProhibitAttributes(FnAttrs);
2142 }
2143
2144 if (DefinitionKind) {
2145 if (!DeclaratorInfo.isFunctionDeclarator()) {
2146 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
2147 ConsumeBrace();
2148 SkipUntil(tok::r_brace, /*StopAtSemi*/false);
2149
2150 // Consume the optional ';'
2151 if (Tok.is(tok::semi))
2152 ConsumeToken();
2153 return;
2154 }
2155
2156 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
2157 Diag(DeclaratorInfo.getIdentifierLoc(),
2158 diag::err_function_declared_typedef);
2159
2160 // Recover by treating the 'typedef' as spurious.
2161 DS.ClearStorageClassSpecs();
2162 }
2163
2164 Decl *FunDecl =
2165 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
2166 VS, DefinitionKind, Init);
2167
2168 if (FunDecl) {
2169 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2170 CommonLateParsedAttrs[i]->addDecl(FunDecl);
2171 }
2172 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2173 LateParsedAttrs[i]->addDecl(FunDecl);
2174 }
2175 }
2176 LateParsedAttrs.clear();
2177
2178 // Consume the ';' - it's optional unless we have a delete or default
2179 if (Tok.is(tok::semi))
2180 ConsumeExtraSemi(AfterMemberFunctionDefinition);
2181
2182 return;
2183 }
2184 }
2185
2186 // member-declarator-list:
2187 // member-declarator
2188 // member-declarator-list ',' member-declarator
2189
2190 SmallVector<Decl *, 8> DeclsInGroup;
2191 ExprResult BitfieldSize;
2192 bool ExpectSemi = true;
2193
2194 while (1) {
2195 // member-declarator:
2196 // declarator pure-specifier[opt]
2197 // declarator brace-or-equal-initializer[opt]
2198 // identifier[opt] ':' constant-expression
2199 if (Tok.is(tok::colon)) {
2200 ConsumeToken();
2201 BitfieldSize = ParseConstantExpression();
2202 if (BitfieldSize.isInvalid())
2203 SkipUntil(tok::comma, true, true);
2204 }
2205
2206 // If a simple-asm-expr is present, parse it.
2207 if (Tok.is(tok::kw_asm)) {
2208 SourceLocation Loc;
2209 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2210 if (AsmLabel.isInvalid())
2211 SkipUntil(tok::comma, true, true);
2212
2213 DeclaratorInfo.setAsmLabel(AsmLabel.release());
2214 DeclaratorInfo.SetRangeEnd(Loc);
2215 }
2216
2217 // If attributes exist after the declarator, parse them.
2218 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2219
2220 // FIXME: When g++ adds support for this, we'll need to check whether it
2221 // goes before or after the GNU attributes and __asm__.
2222 ParseOptionalCXX11VirtSpecifierSeq(VS, getCurrentClass().IsInterface);
2223
2224 InClassInitStyle HasInClassInit = ICIS_NoInit;
2225 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) {
2226 if (BitfieldSize.get()) {
2227 Diag(Tok, diag::err_bitfield_member_init);
2228 SkipUntil(tok::comma, true, true);
2229 } else {
2230 HasInitializer = true;
2231 if (!DeclaratorInfo.isDeclarationOfFunction() &&
2232 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
2233 != DeclSpec::SCS_typedef)
2234 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2235 }
2236 }
2237
2238 // NOTE: If Sema is the Action module and declarator is an instance field,
2239 // this call will *not* return the created decl; It will return null.
2240 // See Sema::ActOnCXXMemberDeclarator for details.
2241
2242 NamedDecl *ThisDecl = 0;
2243 if (DS.isFriendSpecified()) {
2244 // C++11 [dcl.attr.grammar] p4: If an attribute-specifier-seq appertains
2245 // to a friend declaration, that declaration shall be a definition.
2246 //
2247 // Diagnose attributes appear after friend member function declarator:
2248 // foo [[]] ();
2249 SmallVector<SourceRange, 4> Ranges;
2250 DeclaratorInfo.getCXX11AttributeRanges(Ranges);
2251 if (!Ranges.empty()) {
2252 for (SmallVectorImpl<SourceRange>::iterator I = Ranges.begin(),
2253 E = Ranges.end(); I != E; ++I) {
2254 Diag((*I).getBegin(), diag::err_attributes_not_allowed)
2255 << *I;
2256 }
2257 }
2258
2259 // TODO: handle initializers, bitfields, 'delete'
2260 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2261 TemplateParams);
2262 } else {
2263 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2264 DeclaratorInfo,
2265 TemplateParams,
2266 BitfieldSize.release(),
2267 VS, HasInClassInit);
2268
2269 if (VarTemplateDecl *VT =
2270 ThisDecl ? dyn_cast<VarTemplateDecl>(ThisDecl) : 0)
2271 // Re-direct this decl to refer to the templated decl so that we can
2272 // initialize it.
2273 ThisDecl = VT->getTemplatedDecl();
2274
2275 if (ThisDecl && AccessAttrs)
2276 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs,
2277 false, true);
2278 }
2279
2280 // Handle the initializer.
2281 if (HasInClassInit != ICIS_NoInit &&
2282 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2283 DeclSpec::SCS_static) {
2284 // The initializer was deferred; parse it and cache the tokens.
2285 Diag(Tok, getLangOpts().CPlusPlus11
2286 ? diag::warn_cxx98_compat_nonstatic_member_init
2287 : diag::ext_nonstatic_member_init);
2288
2289 if (DeclaratorInfo.isArrayOfUnknownBound()) {
2290 // C++11 [dcl.array]p3: An array bound may also be omitted when the
2291 // declarator is followed by an initializer.
2292 //
2293 // A brace-or-equal-initializer for a member-declarator is not an
2294 // initializer in the grammar, so this is ill-formed.
2295 Diag(Tok, diag::err_incomplete_array_member_init);
2296 SkipUntil(tok::comma, true, true);
2297
2298 // Avoid later warnings about a class member of incomplete type.
2299 if (ThisDecl)
2300 ThisDecl->setInvalidDecl();
2301 } else
2302 ParseCXXNonStaticMemberInitializer(ThisDecl);
2303 } else if (HasInitializer) {
2304 // Normal initializer.
2305 if (!Init.isUsable())
2306 Init = ParseCXXMemberInitializer(
2307 ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2308
2309 if (Init.isInvalid())
2310 SkipUntil(tok::comma, true, true);
2311 else if (ThisDecl)
2312 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(),
2313 DS.containsPlaceholderType());
2314 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
2315 // No initializer.
2316 Actions.ActOnUninitializedDecl(ThisDecl, DS.containsPlaceholderType());
2317
2318 if (ThisDecl) {
2319 if (!ThisDecl->isInvalidDecl()) {
2320 // Set the Decl for any late parsed attributes
2321 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i)
2322 CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2323
2324 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i)
2325 LateParsedAttrs[i]->addDecl(ThisDecl);
2326 }
2327 Actions.FinalizeDeclaration(ThisDecl);
2328 DeclsInGroup.push_back(ThisDecl);
2329
2330 if (DeclaratorInfo.isFunctionDeclarator() &&
2331 DeclaratorInfo.getDeclSpec().getStorageClassSpec() !=
2332 DeclSpec::SCS_typedef)
2333 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2334 }
2335 LateParsedAttrs.clear();
2336
2337 DeclaratorInfo.complete(ThisDecl);
2338
2339 // If we don't have a comma, it is either the end of the list (a ';')
2340 // or an error, bail out.
2341 if (Tok.isNot(tok::comma))
2342 break;
2343
2344 // Consume the comma.
2345 SourceLocation CommaLoc = ConsumeToken();
2346
2347 if (Tok.isAtStartOfLine() &&
2348 !MightBeDeclarator(Declarator::MemberContext)) {
2349 // This comma was followed by a line-break and something which can't be
2350 // the start of a declarator. The comma was probably a typo for a
2351 // semicolon.
2352 Diag(CommaLoc, diag::err_expected_semi_declaration)
2353 << FixItHint::CreateReplacement(CommaLoc, ";");
2354 ExpectSemi = false;
2355 break;
2356 }
2357
2358 // Parse the next declarator.
2359 DeclaratorInfo.clear();
2360 VS.clear();
2361 BitfieldSize = true;
2362 Init = true;
2363 HasInitializer = false;
2364 DeclaratorInfo.setCommaLoc(CommaLoc);
2365
2366 // Attributes are only allowed on the second declarator.
2367 MaybeParseGNUAttributes(DeclaratorInfo);
2368
2369 if (Tok.isNot(tok::colon))
2370 ParseDeclarator(DeclaratorInfo);
2371 }
2372
2373 if (ExpectSemi &&
2374 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2375 // Skip to end of block or statement.
2376 SkipUntil(tok::r_brace, true, true);
2377 // If we stopped at a ';', eat it.
2378 if (Tok.is(tok::semi)) ConsumeToken();
2379 return;
2380 }
2381
2382 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2383 }
2384
2385 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or
2386 /// pure-specifier. Also detect and reject any attempted defaulted/deleted
2387 /// function definition. The location of the '=', if any, will be placed in
2388 /// EqualLoc.
2389 ///
2390 /// pure-specifier:
2391 /// '= 0'
2392 ///
2393 /// brace-or-equal-initializer:
2394 /// '=' initializer-expression
2395 /// braced-init-list
2396 ///
2397 /// initializer-clause:
2398 /// assignment-expression
2399 /// braced-init-list
2400 ///
2401 /// defaulted/deleted function-definition:
2402 /// '=' 'default'
2403 /// '=' 'delete'
2404 ///
2405 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2406 /// be a constant-expression.
ParseCXXMemberInitializer(Decl * D,bool IsFunction,SourceLocation & EqualLoc)2407 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2408 SourceLocation &EqualLoc) {
2409 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace))
2410 && "Data member initializer not starting with '=' or '{'");
2411
2412 EnterExpressionEvaluationContext Context(Actions,
2413 Sema::PotentiallyEvaluated,
2414 D);
2415 if (Tok.is(tok::equal)) {
2416 EqualLoc = ConsumeToken();
2417 if (Tok.is(tok::kw_delete)) {
2418 // In principle, an initializer of '= delete p;' is legal, but it will
2419 // never type-check. It's better to diagnose it as an ill-formed expression
2420 // than as an ill-formed deleted non-function member.
2421 // An initializer of '= delete p, foo' will never be parsed, because
2422 // a top-level comma always ends the initializer expression.
2423 const Token &Next = NextToken();
2424 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) ||
2425 Next.is(tok::eof)) {
2426 if (IsFunction)
2427 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2428 << 1 /* delete */;
2429 else
2430 Diag(ConsumeToken(), diag::err_deleted_non_function);
2431 return ExprResult();
2432 }
2433 } else if (Tok.is(tok::kw_default)) {
2434 if (IsFunction)
2435 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2436 << 0 /* default */;
2437 else
2438 Diag(ConsumeToken(), diag::err_default_special_members);
2439 return ExprResult();
2440 }
2441
2442 }
2443 return ParseInitializer();
2444 }
2445
2446 /// ParseCXXMemberSpecification - Parse the class definition.
2447 ///
2448 /// member-specification:
2449 /// member-declaration member-specification[opt]
2450 /// access-specifier ':' member-specification[opt]
2451 ///
ParseCXXMemberSpecification(SourceLocation RecordLoc,SourceLocation AttrFixitLoc,ParsedAttributesWithRange & Attrs,unsigned TagType,Decl * TagDecl)2452 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
2453 SourceLocation AttrFixitLoc,
2454 ParsedAttributesWithRange &Attrs,
2455 unsigned TagType, Decl *TagDecl) {
2456 assert((TagType == DeclSpec::TST_struct ||
2457 TagType == DeclSpec::TST_interface ||
2458 TagType == DeclSpec::TST_union ||
2459 TagType == DeclSpec::TST_class) && "Invalid TagType!");
2460
2461 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2462 "parsing struct/union/class body");
2463
2464 // Determine whether this is a non-nested class. Note that local
2465 // classes are *not* considered to be nested classes.
2466 bool NonNestedClass = true;
2467 if (!ClassStack.empty()) {
2468 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2469 if (S->isClassScope()) {
2470 // We're inside a class scope, so this is a nested class.
2471 NonNestedClass = false;
2472
2473 // The Microsoft extension __interface does not permit nested classes.
2474 if (getCurrentClass().IsInterface) {
2475 Diag(RecordLoc, diag::err_invalid_member_in_interface)
2476 << /*ErrorType=*/6
2477 << (isa<NamedDecl>(TagDecl)
2478 ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString()
2479 : "<anonymous>");
2480 }
2481 break;
2482 }
2483
2484 if ((S->getFlags() & Scope::FnScope)) {
2485 // If we're in a function or function template declared in the
2486 // body of a class, then this is a local class rather than a
2487 // nested class.
2488 const Scope *Parent = S->getParent();
2489 if (Parent->isTemplateParamScope())
2490 Parent = Parent->getParent();
2491 if (Parent->isClassScope())
2492 break;
2493 }
2494 }
2495 }
2496
2497 // Enter a scope for the class.
2498 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2499
2500 // Note that we are parsing a new (potentially-nested) class definition.
2501 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass,
2502 TagType == DeclSpec::TST_interface);
2503
2504 if (TagDecl)
2505 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2506
2507 SourceLocation FinalLoc;
2508
2509 // Parse the optional 'final' keyword.
2510 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2511 assert(isCXX11FinalKeyword() && "not a class definition");
2512 FinalLoc = ConsumeToken();
2513
2514 if (TagType == DeclSpec::TST_interface) {
2515 Diag(FinalLoc, diag::err_override_control_interface)
2516 << "final";
2517 } else {
2518 Diag(FinalLoc, getLangOpts().CPlusPlus11 ?
2519 diag::warn_cxx98_compat_override_control_keyword :
2520 diag::ext_override_control_keyword) << "final";
2521 }
2522
2523 // Parse any C++11 attributes after 'final' keyword.
2524 // These attributes are not allowed to appear here,
2525 // and the only possible place for them to appertain
2526 // to the class would be between class-key and class-name.
2527 CheckMisplacedCXX11Attribute(Attrs, AttrFixitLoc);
2528 }
2529
2530 if (Tok.is(tok::colon)) {
2531 ParseBaseClause(TagDecl);
2532
2533 if (!Tok.is(tok::l_brace)) {
2534 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
2535
2536 if (TagDecl)
2537 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
2538 return;
2539 }
2540 }
2541
2542 assert(Tok.is(tok::l_brace));
2543 BalancedDelimiterTracker T(*this, tok::l_brace);
2544 T.consumeOpen();
2545
2546 if (TagDecl)
2547 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
2548 T.getOpenLocation());
2549
2550 // C++ 11p3: Members of a class defined with the keyword class are private
2551 // by default. Members of a class defined with the keywords struct or union
2552 // are public by default.
2553 AccessSpecifier CurAS;
2554 if (TagType == DeclSpec::TST_class)
2555 CurAS = AS_private;
2556 else
2557 CurAS = AS_public;
2558 ParsedAttributes AccessAttrs(AttrFactory);
2559
2560 if (TagDecl) {
2561 // While we still have something to read, read the member-declarations.
2562 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
2563 // Each iteration of this loop reads one member-declaration.
2564
2565 if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) ||
2566 Tok.is(tok::kw___if_not_exists))) {
2567 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2568 continue;
2569 }
2570
2571 // Check for extraneous top-level semicolon.
2572 if (Tok.is(tok::semi)) {
2573 ConsumeExtraSemi(InsideStruct, TagType);
2574 continue;
2575 }
2576
2577 if (Tok.is(tok::annot_pragma_vis)) {
2578 HandlePragmaVisibility();
2579 continue;
2580 }
2581
2582 if (Tok.is(tok::annot_pragma_pack)) {
2583 HandlePragmaPack();
2584 continue;
2585 }
2586
2587 if (Tok.is(tok::annot_pragma_align)) {
2588 HandlePragmaAlign();
2589 continue;
2590 }
2591
2592 if (Tok.is(tok::annot_pragma_openmp)) {
2593 ParseOpenMPDeclarativeDirective();
2594 continue;
2595 }
2596
2597 AccessSpecifier AS = getAccessSpecifierIfPresent();
2598 if (AS != AS_none) {
2599 // Current token is a C++ access specifier.
2600 CurAS = AS;
2601 SourceLocation ASLoc = Tok.getLocation();
2602 unsigned TokLength = Tok.getLength();
2603 ConsumeToken();
2604 AccessAttrs.clear();
2605 MaybeParseGNUAttributes(AccessAttrs);
2606
2607 SourceLocation EndLoc;
2608 if (Tok.is(tok::colon)) {
2609 EndLoc = Tok.getLocation();
2610 ConsumeToken();
2611 } else if (Tok.is(tok::semi)) {
2612 EndLoc = Tok.getLocation();
2613 ConsumeToken();
2614 Diag(EndLoc, diag::err_expected_colon)
2615 << FixItHint::CreateReplacement(EndLoc, ":");
2616 } else {
2617 EndLoc = ASLoc.getLocWithOffset(TokLength);
2618 Diag(EndLoc, diag::err_expected_colon)
2619 << FixItHint::CreateInsertion(EndLoc, ":");
2620 }
2621
2622 // The Microsoft extension __interface does not permit non-public
2623 // access specifiers.
2624 if (TagType == DeclSpec::TST_interface && CurAS != AS_public) {
2625 Diag(ASLoc, diag::err_access_specifier_interface)
2626 << (CurAS == AS_protected);
2627 }
2628
2629 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc,
2630 AccessAttrs.getList())) {
2631 // found another attribute than only annotations
2632 AccessAttrs.clear();
2633 }
2634
2635 continue;
2636 }
2637
2638 // FIXME: Make sure we don't have a template here.
2639
2640 // Parse all the comma separated declarators.
2641 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList());
2642 }
2643
2644 T.consumeClose();
2645 } else {
2646 SkipUntil(tok::r_brace, false, false);
2647 }
2648
2649 // If attributes exist after class contents, parse them.
2650 ParsedAttributes attrs(AttrFactory);
2651 MaybeParseGNUAttributes(attrs);
2652
2653 if (TagDecl)
2654 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
2655 T.getOpenLocation(),
2656 T.getCloseLocation(),
2657 attrs.getList());
2658
2659 // C++11 [class.mem]p2:
2660 // Within the class member-specification, the class is regarded as complete
2661 // within function bodies, default arguments, and
2662 // brace-or-equal-initializers for non-static data members (including such
2663 // things in nested classes).
2664 if (TagDecl && NonNestedClass) {
2665 // We are not inside a nested class. This class and its nested classes
2666 // are complete and we can parse the delayed portions of method
2667 // declarations and the lexed inline method definitions, along with any
2668 // delayed attributes.
2669 SourceLocation SavedPrevTokLocation = PrevTokLocation;
2670 ParseLexedAttributes(getCurrentClass());
2671 ParseLexedMethodDeclarations(getCurrentClass());
2672
2673 // We've finished with all pending member declarations.
2674 Actions.ActOnFinishCXXMemberDecls();
2675
2676 ParseLexedMemberInitializers(getCurrentClass());
2677 ParseLexedMethodDefs(getCurrentClass());
2678 PrevTokLocation = SavedPrevTokLocation;
2679 }
2680
2681 if (TagDecl)
2682 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl,
2683 T.getCloseLocation());
2684
2685 // Leave the class scope.
2686 ParsingDef.Pop();
2687 ClassScope.Exit();
2688 }
2689
2690 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
2691 /// which explicitly initializes the members or base classes of a
2692 /// class (C++ [class.base.init]). For example, the three initializers
2693 /// after the ':' in the Derived constructor below:
2694 ///
2695 /// @code
2696 /// class Base { };
2697 /// class Derived : Base {
2698 /// int x;
2699 /// float f;
2700 /// public:
2701 /// Derived(float f) : Base(), x(17), f(f) { }
2702 /// };
2703 /// @endcode
2704 ///
2705 /// [C++] ctor-initializer:
2706 /// ':' mem-initializer-list
2707 ///
2708 /// [C++] mem-initializer-list:
2709 /// mem-initializer ...[opt]
2710 /// mem-initializer ...[opt] , mem-initializer-list
ParseConstructorInitializer(Decl * ConstructorDecl)2711 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
2712 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
2713
2714 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
2715 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
2716 SourceLocation ColonLoc = ConsumeToken();
2717
2718 SmallVector<CXXCtorInitializer*, 4> MemInitializers;
2719 bool AnyErrors = false;
2720
2721 do {
2722 if (Tok.is(tok::code_completion)) {
2723 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
2724 MemInitializers);
2725 return cutOffParsing();
2726 } else {
2727 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
2728 if (!MemInit.isInvalid())
2729 MemInitializers.push_back(MemInit.get());
2730 else
2731 AnyErrors = true;
2732 }
2733
2734 if (Tok.is(tok::comma))
2735 ConsumeToken();
2736 else if (Tok.is(tok::l_brace))
2737 break;
2738 // If the next token looks like a base or member initializer, assume that
2739 // we're just missing a comma.
2740 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
2741 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
2742 Diag(Loc, diag::err_ctor_init_missing_comma)
2743 << FixItHint::CreateInsertion(Loc, ", ");
2744 } else {
2745 // Skip over garbage, until we get to '{'. Don't eat the '{'.
2746 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
2747 SkipUntil(tok::l_brace, true, true);
2748 break;
2749 }
2750 } while (true);
2751
2752 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, MemInitializers,
2753 AnyErrors);
2754 }
2755
2756 /// ParseMemInitializer - Parse a C++ member initializer, which is
2757 /// part of a constructor initializer that explicitly initializes one
2758 /// member or base class (C++ [class.base.init]). See
2759 /// ParseConstructorInitializer for an example.
2760 ///
2761 /// [C++] mem-initializer:
2762 /// mem-initializer-id '(' expression-list[opt] ')'
2763 /// [C++0x] mem-initializer-id braced-init-list
2764 ///
2765 /// [C++] mem-initializer-id:
2766 /// '::'[opt] nested-name-specifier[opt] class-name
2767 /// identifier
ParseMemInitializer(Decl * ConstructorDecl)2768 Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
2769 // parse '::'[opt] nested-name-specifier[opt]
2770 CXXScopeSpec SS;
2771 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
2772 ParsedType TemplateTypeTy;
2773 if (Tok.is(tok::annot_template_id)) {
2774 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2775 if (TemplateId->Kind == TNK_Type_template ||
2776 TemplateId->Kind == TNK_Dependent_template_name) {
2777 AnnotateTemplateIdTokenAsType();
2778 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2779 TemplateTypeTy = getTypeAnnotation(Tok);
2780 }
2781 }
2782 // Uses of decltype will already have been converted to annot_decltype by
2783 // ParseOptionalCXXScopeSpecifier at this point.
2784 if (!TemplateTypeTy && Tok.isNot(tok::identifier)
2785 && Tok.isNot(tok::annot_decltype)) {
2786 Diag(Tok, diag::err_expected_member_or_base_name);
2787 return true;
2788 }
2789
2790 IdentifierInfo *II = 0;
2791 DeclSpec DS(AttrFactory);
2792 SourceLocation IdLoc = Tok.getLocation();
2793 if (Tok.is(tok::annot_decltype)) {
2794 // Get the decltype expression, if there is one.
2795 ParseDecltypeSpecifier(DS);
2796 } else {
2797 if (Tok.is(tok::identifier))
2798 // Get the identifier. This may be a member name or a class name,
2799 // but we'll let the semantic analysis determine which it is.
2800 II = Tok.getIdentifierInfo();
2801 ConsumeToken();
2802 }
2803
2804
2805 // Parse the '('.
2806 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
2807 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2808
2809 ExprResult InitList = ParseBraceInitializer();
2810 if (InitList.isInvalid())
2811 return true;
2812
2813 SourceLocation EllipsisLoc;
2814 if (Tok.is(tok::ellipsis))
2815 EllipsisLoc = ConsumeToken();
2816
2817 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2818 TemplateTypeTy, DS, IdLoc,
2819 InitList.take(), EllipsisLoc);
2820 } else if(Tok.is(tok::l_paren)) {
2821 BalancedDelimiterTracker T(*this, tok::l_paren);
2822 T.consumeOpen();
2823
2824 // Parse the optional expression-list.
2825 ExprVector ArgExprs;
2826 CommaLocsTy CommaLocs;
2827 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2828 SkipUntil(tok::r_paren);
2829 return true;
2830 }
2831
2832 T.consumeClose();
2833
2834 SourceLocation EllipsisLoc;
2835 if (Tok.is(tok::ellipsis))
2836 EllipsisLoc = ConsumeToken();
2837
2838 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2839 TemplateTypeTy, DS, IdLoc,
2840 T.getOpenLocation(), ArgExprs,
2841 T.getCloseLocation(), EllipsisLoc);
2842 }
2843
2844 Diag(Tok, getLangOpts().CPlusPlus11 ? diag::err_expected_lparen_or_lbrace
2845 : diag::err_expected_lparen);
2846 return true;
2847 }
2848
2849 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2850 ///
2851 /// exception-specification:
2852 /// dynamic-exception-specification
2853 /// noexcept-specification
2854 ///
2855 /// noexcept-specification:
2856 /// 'noexcept'
2857 /// 'noexcept' '(' constant-expression ')'
2858 ExceptionSpecificationType
tryParseExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & DynamicExceptions,SmallVectorImpl<SourceRange> & DynamicExceptionRanges,ExprResult & NoexceptExpr)2859 Parser::tryParseExceptionSpecification(
2860 SourceRange &SpecificationRange,
2861 SmallVectorImpl<ParsedType> &DynamicExceptions,
2862 SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2863 ExprResult &NoexceptExpr) {
2864 ExceptionSpecificationType Result = EST_None;
2865
2866 // See if there's a dynamic specification.
2867 if (Tok.is(tok::kw_throw)) {
2868 Result = ParseDynamicExceptionSpecification(SpecificationRange,
2869 DynamicExceptions,
2870 DynamicExceptionRanges);
2871 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2872 "Produced different number of exception types and ranges.");
2873 }
2874
2875 // If there's no noexcept specification, we're done.
2876 if (Tok.isNot(tok::kw_noexcept))
2877 return Result;
2878
2879 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
2880
2881 // If we already had a dynamic specification, parse the noexcept for,
2882 // recovery, but emit a diagnostic and don't store the results.
2883 SourceRange NoexceptRange;
2884 ExceptionSpecificationType NoexceptType = EST_None;
2885
2886 SourceLocation KeywordLoc = ConsumeToken();
2887 if (Tok.is(tok::l_paren)) {
2888 // There is an argument.
2889 BalancedDelimiterTracker T(*this, tok::l_paren);
2890 T.consumeOpen();
2891 NoexceptType = EST_ComputedNoexcept;
2892 NoexceptExpr = ParseConstantExpression();
2893 // The argument must be contextually convertible to bool. We use
2894 // ActOnBooleanCondition for this purpose.
2895 if (!NoexceptExpr.isInvalid())
2896 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2897 NoexceptExpr.get());
2898 T.consumeClose();
2899 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
2900 } else {
2901 // There is no argument.
2902 NoexceptType = EST_BasicNoexcept;
2903 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2904 }
2905
2906 if (Result == EST_None) {
2907 SpecificationRange = NoexceptRange;
2908 Result = NoexceptType;
2909
2910 // If there's a dynamic specification after a noexcept specification,
2911 // parse that and ignore the results.
2912 if (Tok.is(tok::kw_throw)) {
2913 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2914 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2915 DynamicExceptionRanges);
2916 }
2917 } else {
2918 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2919 }
2920
2921 return Result;
2922 }
2923
diagnoseDynamicExceptionSpecification(Parser & P,const SourceRange & Range,bool IsNoexcept)2924 static void diagnoseDynamicExceptionSpecification(
2925 Parser &P, const SourceRange &Range, bool IsNoexcept) {
2926 if (P.getLangOpts().CPlusPlus11) {
2927 const char *Replacement = IsNoexcept ? "noexcept" : "noexcept(false)";
2928 P.Diag(Range.getBegin(), diag::warn_exception_spec_deprecated) << Range;
2929 P.Diag(Range.getBegin(), diag::note_exception_spec_deprecated)
2930 << Replacement << FixItHint::CreateReplacement(Range, Replacement);
2931 }
2932 }
2933
2934 /// ParseDynamicExceptionSpecification - Parse a C++
2935 /// dynamic-exception-specification (C++ [except.spec]).
2936 ///
2937 /// dynamic-exception-specification:
2938 /// 'throw' '(' type-id-list [opt] ')'
2939 /// [MS] 'throw' '(' '...' ')'
2940 ///
2941 /// type-id-list:
2942 /// type-id ... [opt]
2943 /// type-id-list ',' type-id ... [opt]
2944 ///
ParseDynamicExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & Exceptions,SmallVectorImpl<SourceRange> & Ranges)2945 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2946 SourceRange &SpecificationRange,
2947 SmallVectorImpl<ParsedType> &Exceptions,
2948 SmallVectorImpl<SourceRange> &Ranges) {
2949 assert(Tok.is(tok::kw_throw) && "expected throw");
2950
2951 SpecificationRange.setBegin(ConsumeToken());
2952 BalancedDelimiterTracker T(*this, tok::l_paren);
2953 if (T.consumeOpen()) {
2954 Diag(Tok, diag::err_expected_lparen_after) << "throw";
2955 SpecificationRange.setEnd(SpecificationRange.getBegin());
2956 return EST_DynamicNone;
2957 }
2958
2959 // Parse throw(...), a Microsoft extension that means "this function
2960 // can throw anything".
2961 if (Tok.is(tok::ellipsis)) {
2962 SourceLocation EllipsisLoc = ConsumeToken();
2963 if (!getLangOpts().MicrosoftExt)
2964 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2965 T.consumeClose();
2966 SpecificationRange.setEnd(T.getCloseLocation());
2967 diagnoseDynamicExceptionSpecification(*this, SpecificationRange, false);
2968 return EST_MSAny;
2969 }
2970
2971 // Parse the sequence of type-ids.
2972 SourceRange Range;
2973 while (Tok.isNot(tok::r_paren)) {
2974 TypeResult Res(ParseTypeName(&Range));
2975
2976 if (Tok.is(tok::ellipsis)) {
2977 // C++0x [temp.variadic]p5:
2978 // - In a dynamic-exception-specification (15.4); the pattern is a
2979 // type-id.
2980 SourceLocation Ellipsis = ConsumeToken();
2981 Range.setEnd(Ellipsis);
2982 if (!Res.isInvalid())
2983 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2984 }
2985
2986 if (!Res.isInvalid()) {
2987 Exceptions.push_back(Res.get());
2988 Ranges.push_back(Range);
2989 }
2990
2991 if (Tok.is(tok::comma))
2992 ConsumeToken();
2993 else
2994 break;
2995 }
2996
2997 T.consumeClose();
2998 SpecificationRange.setEnd(T.getCloseLocation());
2999 diagnoseDynamicExceptionSpecification(*this, SpecificationRange,
3000 Exceptions.empty());
3001 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
3002 }
3003
3004 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
3005 /// function declaration.
ParseTrailingReturnType(SourceRange & Range)3006 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
3007 assert(Tok.is(tok::arrow) && "expected arrow");
3008
3009 ConsumeToken();
3010
3011 return ParseTypeName(&Range, Declarator::TrailingReturnContext);
3012 }
3013
3014 /// \brief We have just started parsing the definition of a new class,
3015 /// so push that class onto our stack of classes that is currently
3016 /// being parsed.
3017 Sema::ParsingClassState
PushParsingClass(Decl * ClassDecl,bool NonNestedClass,bool IsInterface)3018 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass,
3019 bool IsInterface) {
3020 assert((NonNestedClass || !ClassStack.empty()) &&
3021 "Nested class without outer class");
3022 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface));
3023 return Actions.PushParsingClass();
3024 }
3025
3026 /// \brief Deallocate the given parsed class and all of its nested
3027 /// classes.
DeallocateParsedClasses(Parser::ParsingClass * Class)3028 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
3029 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
3030 delete Class->LateParsedDeclarations[I];
3031 delete Class;
3032 }
3033
3034 /// \brief Pop the top class of the stack of classes that are
3035 /// currently being parsed.
3036 ///
3037 /// This routine should be called when we have finished parsing the
3038 /// definition of a class, but have not yet popped the Scope
3039 /// associated with the class's definition.
PopParsingClass(Sema::ParsingClassState state)3040 void Parser::PopParsingClass(Sema::ParsingClassState state) {
3041 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
3042
3043 Actions.PopParsingClass(state);
3044
3045 ParsingClass *Victim = ClassStack.top();
3046 ClassStack.pop();
3047 if (Victim->TopLevelClass) {
3048 // Deallocate all of the nested classes of this class,
3049 // recursively: we don't need to keep any of this information.
3050 DeallocateParsedClasses(Victim);
3051 return;
3052 }
3053 assert(!ClassStack.empty() && "Missing top-level class?");
3054
3055 if (Victim->LateParsedDeclarations.empty()) {
3056 // The victim is a nested class, but we will not need to perform
3057 // any processing after the definition of this class since it has
3058 // no members whose handling was delayed. Therefore, we can just
3059 // remove this nested class.
3060 DeallocateParsedClasses(Victim);
3061 return;
3062 }
3063
3064 // This nested class has some members that will need to be processed
3065 // after the top-level class is completely defined. Therefore, add
3066 // it to the list of nested classes within its parent.
3067 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
3068 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
3069 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
3070 }
3071
3072 /// \brief Try to parse an 'identifier' which appears within an attribute-token.
3073 ///
3074 /// \return the parsed identifier on success, and 0 if the next token is not an
3075 /// attribute-token.
3076 ///
3077 /// C++11 [dcl.attr.grammar]p3:
3078 /// If a keyword or an alternative token that satisfies the syntactic
3079 /// requirements of an identifier is contained in an attribute-token,
3080 /// it is considered an identifier.
TryParseCXX11AttributeIdentifier(SourceLocation & Loc)3081 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
3082 switch (Tok.getKind()) {
3083 default:
3084 // Identifiers and keywords have identifier info attached.
3085 if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
3086 Loc = ConsumeToken();
3087 return II;
3088 }
3089 return 0;
3090
3091 case tok::ampamp: // 'and'
3092 case tok::pipe: // 'bitor'
3093 case tok::pipepipe: // 'or'
3094 case tok::caret: // 'xor'
3095 case tok::tilde: // 'compl'
3096 case tok::amp: // 'bitand'
3097 case tok::ampequal: // 'and_eq'
3098 case tok::pipeequal: // 'or_eq'
3099 case tok::caretequal: // 'xor_eq'
3100 case tok::exclaim: // 'not'
3101 case tok::exclaimequal: // 'not_eq'
3102 // Alternative tokens do not have identifier info, but their spelling
3103 // starts with an alphabetical character.
3104 SmallString<8> SpellingBuf;
3105 StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf);
3106 if (isLetter(Spelling[0])) {
3107 Loc = ConsumeToken();
3108 return &PP.getIdentifierTable().get(Spelling);
3109 }
3110 return 0;
3111 }
3112 }
3113
IsBuiltInOrStandardCXX11Attribute(IdentifierInfo * AttrName,IdentifierInfo * ScopeName)3114 static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
3115 IdentifierInfo *ScopeName) {
3116 switch (AttributeList::getKind(AttrName, ScopeName,
3117 AttributeList::AS_CXX11)) {
3118 case AttributeList::AT_CarriesDependency:
3119 case AttributeList::AT_FallThrough:
3120 case AttributeList::AT_CXX11NoReturn: {
3121 return true;
3122 }
3123
3124 default:
3125 return false;
3126 }
3127 }
3128
3129 /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently
3130 /// only parses standard attributes.
3131 ///
3132 /// [C++11] attribute-specifier:
3133 /// '[' '[' attribute-list ']' ']'
3134 /// alignment-specifier
3135 ///
3136 /// [C++11] attribute-list:
3137 /// attribute[opt]
3138 /// attribute-list ',' attribute[opt]
3139 /// attribute '...'
3140 /// attribute-list ',' attribute '...'
3141 ///
3142 /// [C++11] attribute:
3143 /// attribute-token attribute-argument-clause[opt]
3144 ///
3145 /// [C++11] attribute-token:
3146 /// identifier
3147 /// attribute-scoped-token
3148 ///
3149 /// [C++11] attribute-scoped-token:
3150 /// attribute-namespace '::' identifier
3151 ///
3152 /// [C++11] attribute-namespace:
3153 /// identifier
3154 ///
3155 /// [C++11] attribute-argument-clause:
3156 /// '(' balanced-token-seq ')'
3157 ///
3158 /// [C++11] balanced-token-seq:
3159 /// balanced-token
3160 /// balanced-token-seq balanced-token
3161 ///
3162 /// [C++11] balanced-token:
3163 /// '(' balanced-token-seq ')'
3164 /// '[' balanced-token-seq ']'
3165 /// '{' balanced-token-seq '}'
3166 /// any token but '(', ')', '[', ']', '{', or '}'
ParseCXX11AttributeSpecifier(ParsedAttributes & attrs,SourceLocation * endLoc)3167 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
3168 SourceLocation *endLoc) {
3169 if (Tok.is(tok::kw_alignas)) {
3170 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
3171 ParseAlignmentSpecifier(attrs, endLoc);
3172 return;
3173 }
3174
3175 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
3176 && "Not a C++11 attribute list");
3177
3178 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
3179
3180 ConsumeBracket();
3181 ConsumeBracket();
3182
3183 llvm::SmallDenseMap<IdentifierInfo*, SourceLocation, 4> SeenAttrs;
3184
3185 while (Tok.isNot(tok::r_square)) {
3186 // attribute not present
3187 if (Tok.is(tok::comma)) {
3188 ConsumeToken();
3189 continue;
3190 }
3191
3192 SourceLocation ScopeLoc, AttrLoc;
3193 IdentifierInfo *ScopeName = 0, *AttrName = 0;
3194
3195 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3196 if (!AttrName)
3197 // Break out to the "expected ']'" diagnostic.
3198 break;
3199
3200 // scoped attribute
3201 if (Tok.is(tok::coloncolon)) {
3202 ConsumeToken();
3203
3204 ScopeName = AttrName;
3205 ScopeLoc = AttrLoc;
3206
3207 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
3208 if (!AttrName) {
3209 Diag(Tok.getLocation(), diag::err_expected_ident);
3210 SkipUntil(tok::r_square, tok::comma, true, true);
3211 continue;
3212 }
3213 }
3214
3215 bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName,ScopeName);
3216 bool AttrParsed = false;
3217
3218 if (StandardAttr &&
3219 !SeenAttrs.insert(std::make_pair(AttrName, AttrLoc)).second)
3220 Diag(AttrLoc, diag::err_cxx11_attribute_repeated)
3221 << AttrName << SourceRange(SeenAttrs[AttrName]);
3222
3223 // Parse attribute arguments
3224 if (Tok.is(tok::l_paren)) {
3225 if (ScopeName && ScopeName->getName() == "gnu") {
3226 ParseGNUAttributeArgs(AttrName, AttrLoc, attrs, endLoc,
3227 ScopeName, ScopeLoc, AttributeList::AS_CXX11);
3228 AttrParsed = true;
3229 } else {
3230 if (StandardAttr)
3231 Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments)
3232 << AttrName->getName();
3233
3234 // FIXME: handle other formats of c++11 attribute arguments
3235 ConsumeParen();
3236 SkipUntil(tok::r_paren, false);
3237 }
3238 }
3239
3240 if (!AttrParsed)
3241 attrs.addNew(AttrName,
3242 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc,
3243 AttrLoc),
3244 ScopeName, ScopeLoc, 0,
3245 SourceLocation(), 0, 0, AttributeList::AS_CXX11);
3246
3247 if (Tok.is(tok::ellipsis)) {
3248 ConsumeToken();
3249
3250 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
3251 << AttrName->getName();
3252 }
3253 }
3254
3255 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
3256 SkipUntil(tok::r_square, false);
3257 if (endLoc)
3258 *endLoc = Tok.getLocation();
3259 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
3260 SkipUntil(tok::r_square, false);
3261 }
3262
3263 /// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq.
3264 ///
3265 /// attribute-specifier-seq:
3266 /// attribute-specifier-seq[opt] attribute-specifier
ParseCXX11Attributes(ParsedAttributesWithRange & attrs,SourceLocation * endLoc)3267 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
3268 SourceLocation *endLoc) {
3269 assert(getLangOpts().CPlusPlus11);
3270
3271 SourceLocation StartLoc = Tok.getLocation(), Loc;
3272 if (!endLoc)
3273 endLoc = &Loc;
3274
3275 do {
3276 ParseCXX11AttributeSpecifier(attrs, endLoc);
3277 } while (isCXX11AttributeSpecifier());
3278
3279 attrs.Range = SourceRange(StartLoc, *endLoc);
3280 }
3281
3282 /// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
3283 ///
3284 /// [MS] ms-attribute:
3285 /// '[' token-seq ']'
3286 ///
3287 /// [MS] ms-attribute-seq:
3288 /// ms-attribute[opt]
3289 /// ms-attribute ms-attribute-seq
ParseMicrosoftAttributes(ParsedAttributes & attrs,SourceLocation * endLoc)3290 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
3291 SourceLocation *endLoc) {
3292 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
3293
3294 while (Tok.is(tok::l_square)) {
3295 // FIXME: If this is actually a C++11 attribute, parse it as one.
3296 ConsumeBracket();
3297 SkipUntil(tok::r_square, true, true);
3298 if (endLoc) *endLoc = Tok.getLocation();
3299 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
3300 }
3301 }
3302
ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,AccessSpecifier & CurAS)3303 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
3304 AccessSpecifier& CurAS) {
3305 IfExistsCondition Result;
3306 if (ParseMicrosoftIfExistsCondition(Result))
3307 return;
3308
3309 BalancedDelimiterTracker Braces(*this, tok::l_brace);
3310 if (Braces.consumeOpen()) {
3311 Diag(Tok, diag::err_expected_lbrace);
3312 return;
3313 }
3314
3315 switch (Result.Behavior) {
3316 case IEB_Parse:
3317 // Parse the declarations below.
3318 break;
3319
3320 case IEB_Dependent:
3321 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
3322 << Result.IsIfExists;
3323 // Fall through to skip.
3324
3325 case IEB_Skip:
3326 Braces.skipToEnd();
3327 return;
3328 }
3329
3330 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
3331 // __if_exists, __if_not_exists can nest.
3332 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) {
3333 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
3334 continue;
3335 }
3336
3337 // Check for extraneous top-level semicolon.
3338 if (Tok.is(tok::semi)) {
3339 ConsumeExtraSemi(InsideStruct, TagType);
3340 continue;
3341 }
3342
3343 AccessSpecifier AS = getAccessSpecifierIfPresent();
3344 if (AS != AS_none) {
3345 // Current token is a C++ access specifier.
3346 CurAS = AS;
3347 SourceLocation ASLoc = Tok.getLocation();
3348 ConsumeToken();
3349 if (Tok.is(tok::colon))
3350 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
3351 else
3352 Diag(Tok, diag::err_expected_colon);
3353 ConsumeToken();
3354 continue;
3355 }
3356
3357 // Parse all the comma separated declarators.
3358 ParseCXXClassMemberDeclaration(CurAS, 0);
3359 }
3360
3361 Braces.consumeClose();
3362 }
3363