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/Basic/OperatorKinds.h"
15 #include "clang/Parse/Parser.h"
16 #include "clang/Parse/ParseDiagnostic.h"
17 #include "clang/Sema/DeclSpec.h"
18 #include "clang/Sema/Scope.h"
19 #include "clang/Sema/ParsedTemplate.h"
20 #include "clang/Sema/PrettyDeclStackTrace.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "RAIIObjectsForParser.h"
23 using namespace clang;
24
25 /// ParseNamespace - We know that the current token is a namespace keyword. This
26 /// may either be a top level namespace or a block-level namespace alias. If
27 /// there was an inline keyword, it has already been parsed.
28 ///
29 /// namespace-definition: [C++ 7.3: basic.namespace]
30 /// named-namespace-definition
31 /// unnamed-namespace-definition
32 ///
33 /// unnamed-namespace-definition:
34 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
35 ///
36 /// named-namespace-definition:
37 /// original-namespace-definition
38 /// extension-namespace-definition
39 ///
40 /// original-namespace-definition:
41 /// 'inline'[opt] 'namespace' identifier attributes[opt]
42 /// '{' namespace-body '}'
43 ///
44 /// extension-namespace-definition:
45 /// 'inline'[opt] 'namespace' original-namespace-name
46 /// '{' namespace-body '}'
47 ///
48 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
49 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
50 ///
ParseNamespace(unsigned Context,SourceLocation & DeclEnd,SourceLocation InlineLoc)51 Decl *Parser::ParseNamespace(unsigned Context,
52 SourceLocation &DeclEnd,
53 SourceLocation InlineLoc) {
54 assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
55 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
56 ObjCDeclContextSwitch ObjCDC(*this);
57
58 if (Tok.is(tok::code_completion)) {
59 Actions.CodeCompleteNamespaceDecl(getCurScope());
60 cutOffParsing();
61 return 0;
62 }
63
64 SourceLocation IdentLoc;
65 IdentifierInfo *Ident = 0;
66 std::vector<SourceLocation> ExtraIdentLoc;
67 std::vector<IdentifierInfo*> ExtraIdent;
68 std::vector<SourceLocation> ExtraNamespaceLoc;
69
70 Token attrTok;
71
72 if (Tok.is(tok::identifier)) {
73 Ident = Tok.getIdentifierInfo();
74 IdentLoc = ConsumeToken(); // eat the identifier.
75 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
76 ExtraNamespaceLoc.push_back(ConsumeToken());
77 ExtraIdent.push_back(Tok.getIdentifierInfo());
78 ExtraIdentLoc.push_back(ConsumeToken());
79 }
80 }
81
82 // Read label attributes, if present.
83 ParsedAttributes attrs(AttrFactory);
84 if (Tok.is(tok::kw___attribute)) {
85 attrTok = Tok;
86 ParseGNUAttributes(attrs);
87 }
88
89 if (Tok.is(tok::equal)) {
90 if (!attrs.empty())
91 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
92 if (InlineLoc.isValid())
93 Diag(InlineLoc, diag::err_inline_namespace_alias)
94 << FixItHint::CreateRemoval(InlineLoc);
95 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
96 }
97
98
99 BalancedDelimiterTracker T(*this, tok::l_brace);
100 if (T.consumeOpen()) {
101 if (!ExtraIdent.empty()) {
102 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
103 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
104 }
105 Diag(Tok, Ident ? diag::err_expected_lbrace :
106 diag::err_expected_ident_lbrace);
107 return 0;
108 }
109
110 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
111 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
112 getCurScope()->getFnParent()) {
113 if (!ExtraIdent.empty()) {
114 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
115 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
116 }
117 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
118 SkipUntil(tok::r_brace, false);
119 return 0;
120 }
121
122 if (!ExtraIdent.empty()) {
123 TentativeParsingAction TPA(*this);
124 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true);
125 Token rBraceToken = Tok;
126 TPA.Revert();
127
128 if (!rBraceToken.is(tok::r_brace)) {
129 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
130 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
131 } else {
132 std::string NamespaceFix;
133 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
134 E = ExtraIdent.end(); I != E; ++I) {
135 NamespaceFix += " { namespace ";
136 NamespaceFix += (*I)->getName();
137 }
138
139 std::string RBraces;
140 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
141 RBraces += "} ";
142
143 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
144 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
145 ExtraIdentLoc.back()),
146 NamespaceFix)
147 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
148 }
149 }
150
151 // If we're still good, complain about inline namespaces in non-C++0x now.
152 if (InlineLoc.isValid())
153 Diag(InlineLoc, getLangOpts().CPlusPlus0x ?
154 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
155
156 // Enter a scope for the namespace.
157 ParseScope NamespaceScope(this, Scope::DeclScope);
158
159 Decl *NamespcDecl =
160 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
161 IdentLoc, Ident, T.getOpenLocation(),
162 attrs.getList());
163
164 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
165 "parsing namespace");
166
167 // Parse the contents of the namespace. This includes parsing recovery on
168 // any improperly nested namespaces.
169 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
170 InlineLoc, attrs, T);
171
172 // Leave the namespace scope.
173 NamespaceScope.Exit();
174
175 DeclEnd = T.getCloseLocation();
176 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
177
178 return NamespcDecl;
179 }
180
181 /// 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)182 void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc,
183 std::vector<IdentifierInfo*>& Ident,
184 std::vector<SourceLocation>& NamespaceLoc,
185 unsigned int index, SourceLocation& InlineLoc,
186 ParsedAttributes& attrs,
187 BalancedDelimiterTracker &Tracker) {
188 if (index == Ident.size()) {
189 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
190 ParsedAttributesWithRange attrs(AttrFactory);
191 MaybeParseCXX0XAttributes(attrs);
192 MaybeParseMicrosoftAttributes(attrs);
193 ParseExternalDeclaration(attrs);
194 }
195
196 // The caller is what called check -- we are simply calling
197 // the close for it.
198 Tracker.consumeClose();
199
200 return;
201 }
202
203 // Parse improperly nested namespaces.
204 ParseScope NamespaceScope(this, Scope::DeclScope);
205 Decl *NamespcDecl =
206 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
207 NamespaceLoc[index], IdentLoc[index],
208 Ident[index], Tracker.getOpenLocation(),
209 attrs.getList());
210
211 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
212 attrs, Tracker);
213
214 NamespaceScope.Exit();
215
216 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
217 }
218
219 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
220 /// alias definition.
221 ///
ParseNamespaceAlias(SourceLocation NamespaceLoc,SourceLocation AliasLoc,IdentifierInfo * Alias,SourceLocation & DeclEnd)222 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
223 SourceLocation AliasLoc,
224 IdentifierInfo *Alias,
225 SourceLocation &DeclEnd) {
226 assert(Tok.is(tok::equal) && "Not equal token");
227
228 ConsumeToken(); // eat the '='.
229
230 if (Tok.is(tok::code_completion)) {
231 Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
232 cutOffParsing();
233 return 0;
234 }
235
236 CXXScopeSpec SS;
237 // Parse (optional) nested-name-specifier.
238 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
239
240 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
241 Diag(Tok, diag::err_expected_namespace_name);
242 // Skip to end of the definition and eat the ';'.
243 SkipUntil(tok::semi);
244 return 0;
245 }
246
247 // Parse identifier.
248 IdentifierInfo *Ident = Tok.getIdentifierInfo();
249 SourceLocation IdentLoc = ConsumeToken();
250
251 // Eat the ';'.
252 DeclEnd = Tok.getLocation();
253 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
254 "", tok::semi);
255
256 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
257 SS, IdentLoc, Ident);
258 }
259
260 /// ParseLinkage - We know that the current token is a string_literal
261 /// and just before that, that extern was seen.
262 ///
263 /// linkage-specification: [C++ 7.5p2: dcl.link]
264 /// 'extern' string-literal '{' declaration-seq[opt] '}'
265 /// 'extern' string-literal declaration
266 ///
ParseLinkage(ParsingDeclSpec & DS,unsigned Context)267 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
268 assert(Tok.is(tok::string_literal) && "Not a string literal!");
269 SmallString<8> LangBuffer;
270 bool Invalid = false;
271 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
272 if (Invalid)
273 return 0;
274
275 // FIXME: This is incorrect: linkage-specifiers are parsed in translation
276 // phase 7, so string-literal concatenation is supposed to occur.
277 // extern "" "C" "" "+" "+" { } is legal.
278 if (Tok.hasUDSuffix())
279 Diag(Tok, diag::err_invalid_string_udl);
280 SourceLocation Loc = ConsumeStringToken();
281
282 ParseScope LinkageScope(this, Scope::DeclScope);
283 Decl *LinkageSpec
284 = Actions.ActOnStartLinkageSpecification(getCurScope(),
285 DS.getSourceRange().getBegin(),
286 Loc, Lang,
287 Tok.is(tok::l_brace) ? Tok.getLocation()
288 : SourceLocation());
289
290 ParsedAttributesWithRange attrs(AttrFactory);
291 MaybeParseCXX0XAttributes(attrs);
292 MaybeParseMicrosoftAttributes(attrs);
293
294 if (Tok.isNot(tok::l_brace)) {
295 // Reset the source range in DS, as the leading "extern"
296 // does not really belong to the inner declaration ...
297 DS.SetRangeStart(SourceLocation());
298 DS.SetRangeEnd(SourceLocation());
299 // ... but anyway remember that such an "extern" was seen.
300 DS.setExternInLinkageSpec(true);
301 ParseExternalDeclaration(attrs, &DS);
302 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
303 SourceLocation());
304 }
305
306 DS.abort();
307
308 ProhibitAttributes(attrs);
309
310 BalancedDelimiterTracker T(*this, tok::l_brace);
311 T.consumeOpen();
312 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
313 ParsedAttributesWithRange attrs(AttrFactory);
314 MaybeParseCXX0XAttributes(attrs);
315 MaybeParseMicrosoftAttributes(attrs);
316 ParseExternalDeclaration(attrs);
317 }
318
319 T.consumeClose();
320 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
321 T.getCloseLocation());
322 }
323
324 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
325 /// using-directive. Assumes that current token is 'using'.
ParseUsingDirectiveOrDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,Decl ** OwnedType)326 Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
327 const ParsedTemplateInfo &TemplateInfo,
328 SourceLocation &DeclEnd,
329 ParsedAttributesWithRange &attrs,
330 Decl **OwnedType) {
331 assert(Tok.is(tok::kw_using) && "Not using token");
332 ObjCDeclContextSwitch ObjCDC(*this);
333
334 // Eat 'using'.
335 SourceLocation UsingLoc = ConsumeToken();
336
337 if (Tok.is(tok::code_completion)) {
338 Actions.CodeCompleteUsing(getCurScope());
339 cutOffParsing();
340 return 0;
341 }
342
343 // 'using namespace' means this is a using-directive.
344 if (Tok.is(tok::kw_namespace)) {
345 // Template parameters are always an error here.
346 if (TemplateInfo.Kind) {
347 SourceRange R = TemplateInfo.getSourceRange();
348 Diag(UsingLoc, diag::err_templated_using_directive)
349 << R << FixItHint::CreateRemoval(R);
350 }
351
352 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
353 }
354
355 // Otherwise, it must be a using-declaration or an alias-declaration.
356
357 // Using declarations can't have attributes.
358 ProhibitAttributes(attrs);
359
360 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
361 AS_none, OwnedType);
362 }
363
364 /// ParseUsingDirective - Parse C++ using-directive, assumes
365 /// that current token is 'namespace' and 'using' was already parsed.
366 ///
367 /// using-directive: [C++ 7.3.p4: namespace.udir]
368 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
369 /// namespace-name ;
370 /// [GNU] using-directive:
371 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
372 /// namespace-name attributes[opt] ;
373 ///
ParseUsingDirective(unsigned Context,SourceLocation UsingLoc,SourceLocation & DeclEnd,ParsedAttributes & attrs)374 Decl *Parser::ParseUsingDirective(unsigned Context,
375 SourceLocation UsingLoc,
376 SourceLocation &DeclEnd,
377 ParsedAttributes &attrs) {
378 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
379
380 // Eat 'namespace'.
381 SourceLocation NamespcLoc = ConsumeToken();
382
383 if (Tok.is(tok::code_completion)) {
384 Actions.CodeCompleteUsingDirective(getCurScope());
385 cutOffParsing();
386 return 0;
387 }
388
389 CXXScopeSpec SS;
390 // Parse (optional) nested-name-specifier.
391 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
392
393 IdentifierInfo *NamespcName = 0;
394 SourceLocation IdentLoc = SourceLocation();
395
396 // Parse namespace-name.
397 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
398 Diag(Tok, diag::err_expected_namespace_name);
399 // If there was invalid namespace name, skip to end of decl, and eat ';'.
400 SkipUntil(tok::semi);
401 // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
402 return 0;
403 }
404
405 // Parse identifier.
406 NamespcName = Tok.getIdentifierInfo();
407 IdentLoc = ConsumeToken();
408
409 // Parse (optional) attributes (most likely GNU strong-using extension).
410 bool GNUAttr = false;
411 if (Tok.is(tok::kw___attribute)) {
412 GNUAttr = true;
413 ParseGNUAttributes(attrs);
414 }
415
416 // Eat ';'.
417 DeclEnd = Tok.getLocation();
418 ExpectAndConsume(tok::semi,
419 GNUAttr ? diag::err_expected_semi_after_attribute_list
420 : diag::err_expected_semi_after_namespace_name,
421 "", tok::semi);
422
423 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
424 IdentLoc, NamespcName, attrs.getList());
425 }
426
427 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
428 /// Assumes that 'using' was already seen.
429 ///
430 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
431 /// 'using' 'typename'[opt] ::[opt] nested-name-specifier
432 /// unqualified-id
433 /// 'using' :: unqualified-id
434 ///
435 /// alias-declaration: C++0x [decl.typedef]p2
436 /// 'using' identifier = type-id ;
437 ///
ParseUsingDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation UsingLoc,SourceLocation & DeclEnd,AccessSpecifier AS,Decl ** OwnedType)438 Decl *Parser::ParseUsingDeclaration(unsigned Context,
439 const ParsedTemplateInfo &TemplateInfo,
440 SourceLocation UsingLoc,
441 SourceLocation &DeclEnd,
442 AccessSpecifier AS,
443 Decl **OwnedType) {
444 CXXScopeSpec SS;
445 SourceLocation TypenameLoc;
446 bool IsTypeName;
447
448 // Ignore optional 'typename'.
449 // FIXME: This is wrong; we should parse this as a typename-specifier.
450 if (Tok.is(tok::kw_typename)) {
451 TypenameLoc = Tok.getLocation();
452 ConsumeToken();
453 IsTypeName = true;
454 }
455 else
456 IsTypeName = false;
457
458 // Parse nested-name-specifier.
459 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
460
461 // Check nested-name specifier.
462 if (SS.isInvalid()) {
463 SkipUntil(tok::semi);
464 return 0;
465 }
466
467 // Parse the unqualified-id. We allow parsing of both constructor and
468 // destructor names and allow the action module to diagnose any semantic
469 // errors.
470 SourceLocation TemplateKWLoc;
471 UnqualifiedId Name;
472 if (ParseUnqualifiedId(SS,
473 /*EnteringContext=*/false,
474 /*AllowDestructorName=*/true,
475 /*AllowConstructorName=*/true,
476 ParsedType(),
477 TemplateKWLoc,
478 Name)) {
479 SkipUntil(tok::semi);
480 return 0;
481 }
482
483 ParsedAttributes attrs(AttrFactory);
484
485 // Maybe this is an alias-declaration.
486 bool IsAliasDecl = Tok.is(tok::equal);
487 TypeResult TypeAlias;
488 if (IsAliasDecl) {
489 // TODO: Attribute support. C++0x attributes may appear before the equals.
490 // Where can GNU attributes appear?
491 ConsumeToken();
492
493 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ?
494 diag::warn_cxx98_compat_alias_declaration :
495 diag::ext_alias_declaration);
496
497 // Type alias templates cannot be specialized.
498 int SpecKind = -1;
499 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
500 Name.getKind() == UnqualifiedId::IK_TemplateId)
501 SpecKind = 0;
502 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
503 SpecKind = 1;
504 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
505 SpecKind = 2;
506 if (SpecKind != -1) {
507 SourceRange Range;
508 if (SpecKind == 0)
509 Range = SourceRange(Name.TemplateId->LAngleLoc,
510 Name.TemplateId->RAngleLoc);
511 else
512 Range = TemplateInfo.getSourceRange();
513 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
514 << SpecKind << Range;
515 SkipUntil(tok::semi);
516 return 0;
517 }
518
519 // Name must be an identifier.
520 if (Name.getKind() != UnqualifiedId::IK_Identifier) {
521 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
522 // No removal fixit: can't recover from this.
523 SkipUntil(tok::semi);
524 return 0;
525 } else if (IsTypeName)
526 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
527 << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
528 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
529 else if (SS.isNotEmpty())
530 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
531 << FixItHint::CreateRemoval(SS.getRange());
532
533 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ?
534 Declarator::AliasTemplateContext :
535 Declarator::AliasDeclContext, AS, OwnedType);
536 } else
537 // Parse (optional) attributes (most likely GNU strong-using extension).
538 MaybeParseGNUAttributes(attrs);
539
540 // Eat ';'.
541 DeclEnd = Tok.getLocation();
542 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
543 !attrs.empty() ? "attributes list" :
544 IsAliasDecl ? "alias declaration" : "using declaration",
545 tok::semi);
546
547 // Diagnose an attempt to declare a templated using-declaration.
548 // In C++0x, alias-declarations can be templates:
549 // template <...> using id = type;
550 if (TemplateInfo.Kind && !IsAliasDecl) {
551 SourceRange R = TemplateInfo.getSourceRange();
552 Diag(UsingLoc, diag::err_templated_using_declaration)
553 << R << FixItHint::CreateRemoval(R);
554
555 // Unfortunately, we have to bail out instead of recovering by
556 // ignoring the parameters, just in case the nested name specifier
557 // depends on the parameters.
558 return 0;
559 }
560
561 // "typename" keyword is allowed for identifiers only,
562 // because it may be a type definition.
563 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) {
564 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only)
565 << FixItHint::CreateRemoval(SourceRange(TypenameLoc));
566 // Proceed parsing, but reset the IsTypeName flag.
567 IsTypeName = false;
568 }
569
570 if (IsAliasDecl) {
571 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
572 MultiTemplateParamsArg TemplateParamsArg(Actions,
573 TemplateParams ? TemplateParams->data() : 0,
574 TemplateParams ? TemplateParams->size() : 0);
575 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
576 UsingLoc, Name, TypeAlias);
577 }
578
579 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS,
580 Name, attrs.getList(),
581 IsTypeName, TypenameLoc);
582 }
583
584 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
585 ///
586 /// [C++0x] static_assert-declaration:
587 /// static_assert ( constant-expression , string-literal ) ;
588 ///
589 /// [C11] static_assert-declaration:
590 /// _Static_assert ( constant-expression , string-literal ) ;
591 ///
ParseStaticAssertDeclaration(SourceLocation & DeclEnd)592 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
593 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
594 "Not a static_assert declaration");
595
596 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
597 Diag(Tok, diag::ext_c11_static_assert);
598 if (Tok.is(tok::kw_static_assert))
599 Diag(Tok, diag::warn_cxx98_compat_static_assert);
600
601 SourceLocation StaticAssertLoc = ConsumeToken();
602
603 BalancedDelimiterTracker T(*this, tok::l_paren);
604 if (T.consumeOpen()) {
605 Diag(Tok, diag::err_expected_lparen);
606 return 0;
607 }
608
609 ExprResult AssertExpr(ParseConstantExpression());
610 if (AssertExpr.isInvalid()) {
611 SkipUntil(tok::semi);
612 return 0;
613 }
614
615 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
616 return 0;
617
618 if (!isTokenStringLiteral()) {
619 Diag(Tok, diag::err_expected_string_literal);
620 SkipUntil(tok::semi);
621 return 0;
622 }
623
624 ExprResult AssertMessage(ParseStringLiteralExpression());
625 if (AssertMessage.isInvalid()) {
626 SkipUntil(tok::semi);
627 return 0;
628 }
629
630 T.consumeClose();
631
632 DeclEnd = Tok.getLocation();
633 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
634
635 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
636 AssertExpr.take(),
637 AssertMessage.take(),
638 T.getCloseLocation());
639 }
640
641 /// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
642 ///
643 /// 'decltype' ( expression )
644 ///
ParseDecltypeSpecifier(DeclSpec & DS)645 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
646 assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype))
647 && "Not a decltype specifier");
648
649
650 ExprResult Result;
651 SourceLocation StartLoc = Tok.getLocation();
652 SourceLocation EndLoc;
653
654 if (Tok.is(tok::annot_decltype)) {
655 Result = getExprAnnotation(Tok);
656 EndLoc = Tok.getAnnotationEndLoc();
657 ConsumeToken();
658 if (Result.isInvalid()) {
659 DS.SetTypeSpecError();
660 return EndLoc;
661 }
662 } else {
663 if (Tok.getIdentifierInfo()->isStr("decltype"))
664 Diag(Tok, diag::warn_cxx98_compat_decltype);
665
666 ConsumeToken();
667
668 BalancedDelimiterTracker T(*this, tok::l_paren);
669 if (T.expectAndConsume(diag::err_expected_lparen_after,
670 "decltype", tok::r_paren)) {
671 DS.SetTypeSpecError();
672 return T.getOpenLocation() == Tok.getLocation() ?
673 StartLoc : T.getOpenLocation();
674 }
675
676 // Parse the expression
677
678 // C++0x [dcl.type.simple]p4:
679 // The operand of the decltype specifier is an unevaluated operand.
680 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
681 0, /*IsDecltype=*/true);
682 Result = ParseExpression();
683 if (Result.isInvalid()) {
684 SkipUntil(tok::r_paren);
685 DS.SetTypeSpecError();
686 return StartLoc;
687 }
688
689 // Match the ')'
690 T.consumeClose();
691 if (T.getCloseLocation().isInvalid()) {
692 DS.SetTypeSpecError();
693 // FIXME: this should return the location of the last token
694 // that was consumed (by "consumeClose()")
695 return T.getCloseLocation();
696 }
697
698 Result = Actions.ActOnDecltypeExpression(Result.take());
699 if (Result.isInvalid()) {
700 DS.SetTypeSpecError();
701 return T.getCloseLocation();
702 }
703
704 EndLoc = T.getCloseLocation();
705 }
706
707 const char *PrevSpec = 0;
708 unsigned DiagID;
709 // Check for duplicate type specifiers (e.g. "int decltype(a)").
710 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
711 DiagID, Result.release())) {
712 Diag(StartLoc, DiagID) << PrevSpec;
713 DS.SetTypeSpecError();
714 }
715 return EndLoc;
716 }
717
AnnotateExistingDecltypeSpecifier(const DeclSpec & DS,SourceLocation StartLoc,SourceLocation EndLoc)718 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
719 SourceLocation StartLoc,
720 SourceLocation EndLoc) {
721 // make sure we have a token we can turn into an annotation token
722 if (PP.isBacktrackEnabled())
723 PP.RevertCachedTokens(1);
724 else
725 PP.EnterToken(Tok);
726
727 Tok.setKind(tok::annot_decltype);
728 setExprAnnotation(Tok, DS.getTypeSpecType() == TST_decltype ?
729 DS.getRepAsExpr() : ExprResult());
730 Tok.setAnnotationEndLoc(EndLoc);
731 Tok.setLocation(StartLoc);
732 PP.AnnotateCachedTokens(Tok);
733 }
734
ParseUnderlyingTypeSpecifier(DeclSpec & DS)735 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
736 assert(Tok.is(tok::kw___underlying_type) &&
737 "Not an underlying type specifier");
738
739 SourceLocation StartLoc = ConsumeToken();
740 BalancedDelimiterTracker T(*this, tok::l_paren);
741 if (T.expectAndConsume(diag::err_expected_lparen_after,
742 "__underlying_type", tok::r_paren)) {
743 return;
744 }
745
746 TypeResult Result = ParseTypeName();
747 if (Result.isInvalid()) {
748 SkipUntil(tok::r_paren);
749 return;
750 }
751
752 // Match the ')'
753 T.consumeClose();
754 if (T.getCloseLocation().isInvalid())
755 return;
756
757 const char *PrevSpec = 0;
758 unsigned DiagID;
759 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
760 DiagID, Result.release()))
761 Diag(StartLoc, DiagID) << PrevSpec;
762 }
763
764 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
765 /// class name or decltype-specifier. Note that we only check that the result
766 /// names a type; semantic analysis will need to verify that the type names a
767 /// class. The result is either a type or null, depending on whether a type
768 /// name was found.
769 ///
770 /// base-type-specifier: [C++ 10.1]
771 /// class-or-decltype
772 /// class-or-decltype: [C++ 10.1]
773 /// nested-name-specifier[opt] class-name
774 /// decltype-specifier
775 /// class-name: [C++ 9.1]
776 /// identifier
777 /// simple-template-id
778 ///
ParseBaseTypeSpecifier(SourceLocation & BaseLoc,SourceLocation & EndLocation)779 Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
780 SourceLocation &EndLocation) {
781 // Ignore attempts to use typename
782 if (Tok.is(tok::kw_typename)) {
783 Diag(Tok, diag::err_expected_class_name_not_template)
784 << FixItHint::CreateRemoval(Tok.getLocation());
785 ConsumeToken();
786 }
787
788 // Parse optional nested-name-specifier
789 CXXScopeSpec SS;
790 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
791
792 BaseLoc = Tok.getLocation();
793
794 // Parse decltype-specifier
795 // tok == kw_decltype is just error recovery, it can only happen when SS
796 // isn't empty
797 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) {
798 if (SS.isNotEmpty())
799 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
800 << FixItHint::CreateRemoval(SS.getRange());
801 // Fake up a Declarator to use with ActOnTypeName.
802 DeclSpec DS(AttrFactory);
803
804 EndLocation = ParseDecltypeSpecifier(DS);
805
806 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
807 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
808 }
809
810 // Check whether we have a template-id that names a type.
811 if (Tok.is(tok::annot_template_id)) {
812 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
813 if (TemplateId->Kind == TNK_Type_template ||
814 TemplateId->Kind == TNK_Dependent_template_name) {
815 AnnotateTemplateIdTokenAsType();
816
817 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
818 ParsedType Type = getTypeAnnotation(Tok);
819 EndLocation = Tok.getAnnotationEndLoc();
820 ConsumeToken();
821
822 if (Type)
823 return Type;
824 return true;
825 }
826
827 // Fall through to produce an error below.
828 }
829
830 if (Tok.isNot(tok::identifier)) {
831 Diag(Tok, diag::err_expected_class_name);
832 return true;
833 }
834
835 IdentifierInfo *Id = Tok.getIdentifierInfo();
836 SourceLocation IdLoc = ConsumeToken();
837
838 if (Tok.is(tok::less)) {
839 // It looks the user intended to write a template-id here, but the
840 // template-name was wrong. Try to fix that.
841 TemplateNameKind TNK = TNK_Type_template;
842 TemplateTy Template;
843 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
844 &SS, Template, TNK)) {
845 Diag(IdLoc, diag::err_unknown_template_name)
846 << Id;
847 }
848
849 if (!Template)
850 return true;
851
852 // Form the template name
853 UnqualifiedId TemplateName;
854 TemplateName.setIdentifier(Id, IdLoc);
855
856 // Parse the full template-id, then turn it into a type.
857 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
858 TemplateName, true))
859 return true;
860 if (TNK == TNK_Dependent_template_name)
861 AnnotateTemplateIdTokenAsType();
862
863 // If we didn't end up with a typename token, there's nothing more we
864 // can do.
865 if (Tok.isNot(tok::annot_typename))
866 return true;
867
868 // Retrieve the type from the annotation token, consume that token, and
869 // return.
870 EndLocation = Tok.getAnnotationEndLoc();
871 ParsedType Type = getTypeAnnotation(Tok);
872 ConsumeToken();
873 return Type;
874 }
875
876 // We have an identifier; check whether it is actually a type.
877 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
878 false, ParsedType(),
879 /*IsCtorOrDtorName=*/false,
880 /*NonTrivialTypeSourceInfo=*/true);
881 if (!Type) {
882 Diag(IdLoc, diag::err_expected_class_name);
883 return true;
884 }
885
886 // Consume the identifier.
887 EndLocation = IdLoc;
888
889 // Fake up a Declarator to use with ActOnTypeName.
890 DeclSpec DS(AttrFactory);
891 DS.SetRangeStart(IdLoc);
892 DS.SetRangeEnd(EndLocation);
893 DS.getTypeSpecScope() = SS;
894
895 const char *PrevSpec = 0;
896 unsigned DiagID;
897 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
898
899 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
900 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
901 }
902
903 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
904 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
905 /// until we reach the start of a definition or see a token that
906 /// cannot start a definition.
907 ///
908 /// class-specifier: [C++ class]
909 /// class-head '{' member-specification[opt] '}'
910 /// class-head '{' member-specification[opt] '}' attributes[opt]
911 /// class-head:
912 /// class-key identifier[opt] base-clause[opt]
913 /// class-key nested-name-specifier identifier base-clause[opt]
914 /// class-key nested-name-specifier[opt] simple-template-id
915 /// base-clause[opt]
916 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
917 /// [GNU] class-key attributes[opt] nested-name-specifier
918 /// identifier base-clause[opt]
919 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
920 /// simple-template-id base-clause[opt]
921 /// class-key:
922 /// 'class'
923 /// 'struct'
924 /// 'union'
925 ///
926 /// elaborated-type-specifier: [C++ dcl.type.elab]
927 /// class-key ::[opt] nested-name-specifier[opt] identifier
928 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
929 /// simple-template-id
930 ///
931 /// Note that the C++ class-specifier and elaborated-type-specifier,
932 /// together, subsume the C99 struct-or-union-specifier:
933 ///
934 /// struct-or-union-specifier: [C99 6.7.2.1]
935 /// struct-or-union identifier[opt] '{' struct-contents '}'
936 /// struct-or-union identifier
937 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
938 /// '}' attributes[opt]
939 /// [GNU] struct-or-union attributes[opt] identifier
940 /// struct-or-union:
941 /// 'struct'
942 /// 'union'
ParseClassSpecifier(tok::TokenKind TagTokKind,SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,bool EnteringContext,DeclSpecContext DSC)943 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
944 SourceLocation StartLoc, DeclSpec &DS,
945 const ParsedTemplateInfo &TemplateInfo,
946 AccessSpecifier AS,
947 bool EnteringContext, DeclSpecContext DSC) {
948 DeclSpec::TST TagType;
949 if (TagTokKind == tok::kw_struct)
950 TagType = DeclSpec::TST_struct;
951 else if (TagTokKind == tok::kw_class)
952 TagType = DeclSpec::TST_class;
953 else {
954 assert(TagTokKind == tok::kw_union && "Not a class specifier");
955 TagType = DeclSpec::TST_union;
956 }
957
958 if (Tok.is(tok::code_completion)) {
959 // Code completion for a struct, class, or union name.
960 Actions.CodeCompleteTag(getCurScope(), TagType);
961 return cutOffParsing();
962 }
963
964 // C++03 [temp.explicit] 14.7.2/8:
965 // The usual access checking rules do not apply to names used to specify
966 // explicit instantiations.
967 //
968 // As an extension we do not perform access checking on the names used to
969 // specify explicit specializations either. This is important to allow
970 // specializing traits classes for private types.
971 Sema::SuppressAccessChecksRAII SuppressAccess(Actions,
972 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
973 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
974
975 ParsedAttributes attrs(AttrFactory);
976 // If attributes exist after tag, parse them.
977 if (Tok.is(tok::kw___attribute))
978 ParseGNUAttributes(attrs);
979
980 // If declspecs exist after tag, parse them.
981 while (Tok.is(tok::kw___declspec))
982 ParseMicrosoftDeclSpec(attrs);
983
984 // If C++0x attributes exist here, parse them.
985 // FIXME: Are we consistent with the ordering of parsing of different
986 // styles of attributes?
987 MaybeParseCXX0XAttributes(attrs);
988
989 if (TagType == DeclSpec::TST_struct &&
990 !Tok.is(tok::identifier) &&
991 Tok.getIdentifierInfo() &&
992 (Tok.is(tok::kw___is_arithmetic) ||
993 Tok.is(tok::kw___is_convertible) ||
994 Tok.is(tok::kw___is_empty) ||
995 Tok.is(tok::kw___is_floating_point) ||
996 Tok.is(tok::kw___is_function) ||
997 Tok.is(tok::kw___is_fundamental) ||
998 Tok.is(tok::kw___is_integral) ||
999 Tok.is(tok::kw___is_member_function_pointer) ||
1000 Tok.is(tok::kw___is_member_pointer) ||
1001 Tok.is(tok::kw___is_pod) ||
1002 Tok.is(tok::kw___is_pointer) ||
1003 Tok.is(tok::kw___is_same) ||
1004 Tok.is(tok::kw___is_scalar) ||
1005 Tok.is(tok::kw___is_signed) ||
1006 Tok.is(tok::kw___is_unsigned) ||
1007 Tok.is(tok::kw___is_void))) {
1008 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1009 // name of struct templates, but some are keywords in GCC >= 4.3
1010 // and Clang. Therefore, when we see the token sequence "struct
1011 // X", make X into a normal identifier rather than a keyword, to
1012 // allow libstdc++ 4.2 and libc++ to work properly.
1013 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
1014 Tok.setKind(tok::identifier);
1015 }
1016
1017 // Parse the (optional) nested-name-specifier.
1018 CXXScopeSpec &SS = DS.getTypeSpecScope();
1019 if (getLangOpts().CPlusPlus) {
1020 // "FOO : BAR" is not a potential typo for "FOO::BAR".
1021 ColonProtectionRAIIObject X(*this);
1022
1023 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1024 DS.SetTypeSpecError();
1025 if (SS.isSet())
1026 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
1027 Diag(Tok, diag::err_expected_ident);
1028 }
1029
1030 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1031
1032 // Parse the (optional) class name or simple-template-id.
1033 IdentifierInfo *Name = 0;
1034 SourceLocation NameLoc;
1035 TemplateIdAnnotation *TemplateId = 0;
1036 if (Tok.is(tok::identifier)) {
1037 Name = Tok.getIdentifierInfo();
1038 NameLoc = ConsumeToken();
1039
1040 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1041 // The name was supposed to refer to a template, but didn't.
1042 // Eat the template argument list and try to continue parsing this as
1043 // a class (or template thereof).
1044 TemplateArgList TemplateArgs;
1045 SourceLocation LAngleLoc, RAngleLoc;
1046 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
1047 true, LAngleLoc,
1048 TemplateArgs, RAngleLoc)) {
1049 // We couldn't parse the template argument list at all, so don't
1050 // try to give any location information for the list.
1051 LAngleLoc = RAngleLoc = SourceLocation();
1052 }
1053
1054 Diag(NameLoc, diag::err_explicit_spec_non_template)
1055 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1056 << (TagType == DeclSpec::TST_class? 0
1057 : TagType == DeclSpec::TST_struct? 1
1058 : 2)
1059 << Name
1060 << SourceRange(LAngleLoc, RAngleLoc);
1061
1062 // Strip off the last template parameter list if it was empty, since
1063 // we've removed its template argument list.
1064 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1065 if (TemplateParams && TemplateParams->size() > 1) {
1066 TemplateParams->pop_back();
1067 } else {
1068 TemplateParams = 0;
1069 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1070 = ParsedTemplateInfo::NonTemplate;
1071 }
1072 } else if (TemplateInfo.Kind
1073 == ParsedTemplateInfo::ExplicitInstantiation) {
1074 // Pretend this is just a forward declaration.
1075 TemplateParams = 0;
1076 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1077 = ParsedTemplateInfo::NonTemplate;
1078 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
1079 = SourceLocation();
1080 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
1081 = SourceLocation();
1082 }
1083 }
1084 } else if (Tok.is(tok::annot_template_id)) {
1085 TemplateId = takeTemplateIdAnnotation(Tok);
1086 NameLoc = ConsumeToken();
1087
1088 if (TemplateId->Kind != TNK_Type_template &&
1089 TemplateId->Kind != TNK_Dependent_template_name) {
1090 // The template-name in the simple-template-id refers to
1091 // something other than a class template. Give an appropriate
1092 // error message and skip to the ';'.
1093 SourceRange Range(NameLoc);
1094 if (SS.isNotEmpty())
1095 Range.setBegin(SS.getBeginLoc());
1096
1097 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1098 << Name << static_cast<int>(TemplateId->Kind) << Range;
1099
1100 DS.SetTypeSpecError();
1101 SkipUntil(tok::semi, false, true);
1102 return;
1103 }
1104 }
1105
1106 // As soon as we're finished parsing the class's template-id, turn access
1107 // checking back on.
1108 SuppressAccess.done();
1109
1110 // There are four options here.
1111 // - If we are in a trailing return type, this is always just a reference,
1112 // and we must not try to parse a definition. For instance,
1113 // [] () -> struct S { };
1114 // does not define a type.
1115 // - If we have 'struct foo {...', 'struct foo :...',
1116 // 'struct foo final :' or 'struct foo final {', then this is a definition.
1117 // - If we have 'struct foo;', then this is either a forward declaration
1118 // or a friend declaration, which have to be treated differently.
1119 // - Otherwise we have something like 'struct foo xyz', a reference.
1120 // However, in type-specifier-seq's, things look like declarations but are
1121 // just references, e.g.
1122 // new struct s;
1123 // or
1124 // &T::operator struct s;
1125 // For these, DSC is DSC_type_specifier.
1126 Sema::TagUseKind TUK;
1127 if (DSC == DSC_trailing)
1128 TUK = Sema::TUK_Reference;
1129 else if (Tok.is(tok::l_brace) ||
1130 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1131 (isCXX0XFinalKeyword() &&
1132 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1133 if (DS.isFriendSpecified()) {
1134 // C++ [class.friend]p2:
1135 // A class shall not be defined in a friend declaration.
1136 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1137 << SourceRange(DS.getFriendSpecLoc());
1138
1139 // Skip everything up to the semicolon, so that this looks like a proper
1140 // friend class (or template thereof) declaration.
1141 SkipUntil(tok::semi, true, true);
1142 TUK = Sema::TUK_Friend;
1143 } else {
1144 // Okay, this is a class definition.
1145 TUK = Sema::TUK_Definition;
1146 }
1147 } else if (Tok.is(tok::semi) && DSC != DSC_type_specifier)
1148 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1149 else
1150 TUK = Sema::TUK_Reference;
1151
1152 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1153 TUK != Sema::TUK_Definition)) {
1154 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1155 // We have a declaration or reference to an anonymous class.
1156 Diag(StartLoc, diag::err_anon_type_definition)
1157 << DeclSpec::getSpecifierName(TagType);
1158 }
1159
1160 SkipUntil(tok::comma, true);
1161 return;
1162 }
1163
1164 // Create the tag portion of the class or class template.
1165 DeclResult TagOrTempResult = true; // invalid
1166 TypeResult TypeResult = true; // invalid
1167
1168 bool Owned = false;
1169 if (TemplateId) {
1170 // Explicit specialization, class template partial specialization,
1171 // or explicit instantiation.
1172 ASTTemplateArgsPtr TemplateArgsPtr(Actions,
1173 TemplateId->getTemplateArgs(),
1174 TemplateId->NumArgs);
1175 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1176 TUK == Sema::TUK_Declaration) {
1177 // This is an explicit instantiation of a class template.
1178 TagOrTempResult
1179 = Actions.ActOnExplicitInstantiation(getCurScope(),
1180 TemplateInfo.ExternLoc,
1181 TemplateInfo.TemplateLoc,
1182 TagType,
1183 StartLoc,
1184 SS,
1185 TemplateId->Template,
1186 TemplateId->TemplateNameLoc,
1187 TemplateId->LAngleLoc,
1188 TemplateArgsPtr,
1189 TemplateId->RAngleLoc,
1190 attrs.getList());
1191
1192 // Friend template-ids are treated as references unless
1193 // they have template headers, in which case they're ill-formed
1194 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1195 // We diagnose this error in ActOnClassTemplateSpecialization.
1196 } else if (TUK == Sema::TUK_Reference ||
1197 (TUK == Sema::TUK_Friend &&
1198 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1199 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1200 TemplateId->SS,
1201 TemplateId->TemplateKWLoc,
1202 TemplateId->Template,
1203 TemplateId->TemplateNameLoc,
1204 TemplateId->LAngleLoc,
1205 TemplateArgsPtr,
1206 TemplateId->RAngleLoc);
1207 } else {
1208 // This is an explicit specialization or a class template
1209 // partial specialization.
1210 TemplateParameterLists FakedParamLists;
1211
1212 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1213 // This looks like an explicit instantiation, because we have
1214 // something like
1215 //
1216 // template class Foo<X>
1217 //
1218 // but it actually has a definition. Most likely, this was
1219 // meant to be an explicit specialization, but the user forgot
1220 // the '<>' after 'template'.
1221 assert(TUK == Sema::TUK_Definition && "Expected a definition here");
1222
1223 SourceLocation LAngleLoc
1224 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1225 Diag(TemplateId->TemplateNameLoc,
1226 diag::err_explicit_instantiation_with_definition)
1227 << SourceRange(TemplateInfo.TemplateLoc)
1228 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1229
1230 // Create a fake template parameter list that contains only
1231 // "template<>", so that we treat this construct as a class
1232 // template specialization.
1233 FakedParamLists.push_back(
1234 Actions.ActOnTemplateParameterList(0, SourceLocation(),
1235 TemplateInfo.TemplateLoc,
1236 LAngleLoc,
1237 0, 0,
1238 LAngleLoc));
1239 TemplateParams = &FakedParamLists;
1240 }
1241
1242 // Build the class template specialization.
1243 TagOrTempResult
1244 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
1245 StartLoc, DS.getModulePrivateSpecLoc(), SS,
1246 TemplateId->Template,
1247 TemplateId->TemplateNameLoc,
1248 TemplateId->LAngleLoc,
1249 TemplateArgsPtr,
1250 TemplateId->RAngleLoc,
1251 attrs.getList(),
1252 MultiTemplateParamsArg(Actions,
1253 TemplateParams? &(*TemplateParams)[0] : 0,
1254 TemplateParams? TemplateParams->size() : 0));
1255 }
1256 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1257 TUK == Sema::TUK_Declaration) {
1258 // Explicit instantiation of a member of a class template
1259 // specialization, e.g.,
1260 //
1261 // template struct Outer<int>::Inner;
1262 //
1263 TagOrTempResult
1264 = Actions.ActOnExplicitInstantiation(getCurScope(),
1265 TemplateInfo.ExternLoc,
1266 TemplateInfo.TemplateLoc,
1267 TagType, StartLoc, SS, Name,
1268 NameLoc, attrs.getList());
1269 } else if (TUK == Sema::TUK_Friend &&
1270 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1271 TagOrTempResult =
1272 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1273 TagType, StartLoc, SS,
1274 Name, NameLoc, attrs.getList(),
1275 MultiTemplateParamsArg(Actions,
1276 TemplateParams? &(*TemplateParams)[0] : 0,
1277 TemplateParams? TemplateParams->size() : 0));
1278 } else {
1279 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1280 TUK == Sema::TUK_Definition) {
1281 // FIXME: Diagnose this particular error.
1282 }
1283
1284 bool IsDependent = false;
1285
1286 // Don't pass down template parameter lists if this is just a tag
1287 // reference. For example, we don't need the template parameters here:
1288 // template <class T> class A *makeA(T t);
1289 MultiTemplateParamsArg TParams;
1290 if (TUK != Sema::TUK_Reference && TemplateParams)
1291 TParams =
1292 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1293
1294 // Declaration or definition of a class type
1295 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1296 SS, Name, NameLoc, attrs.getList(), AS,
1297 DS.getModulePrivateSpecLoc(),
1298 TParams, Owned, IsDependent,
1299 SourceLocation(), false,
1300 clang::TypeResult());
1301
1302 // If ActOnTag said the type was dependent, try again with the
1303 // less common call.
1304 if (IsDependent) {
1305 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1306 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1307 SS, Name, StartLoc, NameLoc);
1308 }
1309 }
1310
1311 // If there is a body, parse it and inform the actions module.
1312 if (TUK == Sema::TUK_Definition) {
1313 assert(Tok.is(tok::l_brace) ||
1314 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1315 isCXX0XFinalKeyword());
1316 if (getLangOpts().CPlusPlus)
1317 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
1318 else
1319 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1320 }
1321
1322 const char *PrevSpec = 0;
1323 unsigned DiagID;
1324 bool Result;
1325 if (!TypeResult.isInvalid()) {
1326 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1327 NameLoc.isValid() ? NameLoc : StartLoc,
1328 PrevSpec, DiagID, TypeResult.get());
1329 } else if (!TagOrTempResult.isInvalid()) {
1330 Result = DS.SetTypeSpecType(TagType, StartLoc,
1331 NameLoc.isValid() ? NameLoc : StartLoc,
1332 PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1333 } else {
1334 DS.SetTypeSpecError();
1335 return;
1336 }
1337
1338 if (Result)
1339 Diag(StartLoc, DiagID) << PrevSpec;
1340
1341 // At this point, we've successfully parsed a class-specifier in 'definition'
1342 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1343 // going to look at what comes after it to improve error recovery. If an
1344 // impossible token occurs next, we assume that the programmer forgot a ; at
1345 // the end of the declaration and recover that way.
1346 //
1347 // This switch enumerates the valid "follow" set for definition.
1348 if (TUK == Sema::TUK_Definition) {
1349 bool ExpectedSemi = true;
1350 switch (Tok.getKind()) {
1351 default: break;
1352 case tok::semi: // struct foo {...} ;
1353 case tok::star: // struct foo {...} * P;
1354 case tok::amp: // struct foo {...} & R = ...
1355 case tok::identifier: // struct foo {...} V ;
1356 case tok::r_paren: //(struct foo {...} ) {4}
1357 case tok::annot_cxxscope: // struct foo {...} a:: b;
1358 case tok::annot_typename: // struct foo {...} a ::b;
1359 case tok::annot_template_id: // struct foo {...} a<int> ::b;
1360 case tok::l_paren: // struct foo {...} ( x);
1361 case tok::comma: // __builtin_offsetof(struct foo{...} ,
1362 ExpectedSemi = false;
1363 break;
1364 // Type qualifiers
1365 case tok::kw_const: // struct foo {...} const x;
1366 case tok::kw_volatile: // struct foo {...} volatile x;
1367 case tok::kw_restrict: // struct foo {...} restrict x;
1368 case tok::kw_inline: // struct foo {...} inline foo() {};
1369 // Storage-class specifiers
1370 case tok::kw_static: // struct foo {...} static x;
1371 case tok::kw_extern: // struct foo {...} extern x;
1372 case tok::kw_typedef: // struct foo {...} typedef x;
1373 case tok::kw_register: // struct foo {...} register x;
1374 case tok::kw_auto: // struct foo {...} auto x;
1375 case tok::kw_mutable: // struct foo {...} mutable x;
1376 case tok::kw_constexpr: // struct foo {...} constexpr x;
1377 // As shown above, type qualifiers and storage class specifiers absolutely
1378 // can occur after class specifiers according to the grammar. However,
1379 // almost no one actually writes code like this. If we see one of these,
1380 // it is much more likely that someone missed a semi colon and the
1381 // type/storage class specifier we're seeing is part of the *next*
1382 // intended declaration, as in:
1383 //
1384 // struct foo { ... }
1385 // typedef int X;
1386 //
1387 // We'd really like to emit a missing semicolon error instead of emitting
1388 // an error on the 'int' saying that you can't have two type specifiers in
1389 // the same declaration of X. Because of this, we look ahead past this
1390 // token to see if it's a type specifier. If so, we know the code is
1391 // otherwise invalid, so we can produce the expected semi error.
1392 if (!isKnownToBeTypeSpecifier(NextToken()))
1393 ExpectedSemi = false;
1394 break;
1395
1396 case tok::r_brace: // struct bar { struct foo {...} }
1397 // Missing ';' at end of struct is accepted as an extension in C mode.
1398 if (!getLangOpts().CPlusPlus)
1399 ExpectedSemi = false;
1400 break;
1401 }
1402
1403 // C++ [temp]p3 In a template-declaration which defines a class, no
1404 // declarator is permitted.
1405 if (TemplateInfo.Kind)
1406 ExpectedSemi = true;
1407
1408 if (ExpectedSemi) {
1409 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1410 TagType == DeclSpec::TST_class ? "class"
1411 : TagType == DeclSpec::TST_struct? "struct" : "union");
1412 // Push this token back into the preprocessor and change our current token
1413 // to ';' so that the rest of the code recovers as though there were an
1414 // ';' after the definition.
1415 PP.EnterToken(Tok);
1416 Tok.setKind(tok::semi);
1417 }
1418 }
1419 }
1420
1421 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1422 ///
1423 /// base-clause : [C++ class.derived]
1424 /// ':' base-specifier-list
1425 /// base-specifier-list:
1426 /// base-specifier '...'[opt]
1427 /// base-specifier-list ',' base-specifier '...'[opt]
ParseBaseClause(Decl * ClassDecl)1428 void Parser::ParseBaseClause(Decl *ClassDecl) {
1429 assert(Tok.is(tok::colon) && "Not a base clause");
1430 ConsumeToken();
1431
1432 // Build up an array of parsed base specifiers.
1433 SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1434
1435 while (true) {
1436 // Parse a base-specifier.
1437 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1438 if (Result.isInvalid()) {
1439 // Skip the rest of this base specifier, up until the comma or
1440 // opening brace.
1441 SkipUntil(tok::comma, tok::l_brace, true, true);
1442 } else {
1443 // Add this to our array of base specifiers.
1444 BaseInfo.push_back(Result.get());
1445 }
1446
1447 // If the next token is a comma, consume it and keep reading
1448 // base-specifiers.
1449 if (Tok.isNot(tok::comma)) break;
1450
1451 // Consume the comma.
1452 ConsumeToken();
1453 }
1454
1455 // Attach the base specifiers
1456 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1457 }
1458
1459 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1460 /// one entry in the base class list of a class specifier, for example:
1461 /// class foo : public bar, virtual private baz {
1462 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1463 ///
1464 /// base-specifier: [C++ class.derived]
1465 /// ::[opt] nested-name-specifier[opt] class-name
1466 /// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1467 /// base-type-specifier
1468 /// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1469 /// base-type-specifier
ParseBaseSpecifier(Decl * ClassDecl)1470 Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1471 bool IsVirtual = false;
1472 SourceLocation StartLoc = Tok.getLocation();
1473
1474 // Parse the 'virtual' keyword.
1475 if (Tok.is(tok::kw_virtual)) {
1476 ConsumeToken();
1477 IsVirtual = true;
1478 }
1479
1480 // Parse an (optional) access specifier.
1481 AccessSpecifier Access = getAccessSpecifierIfPresent();
1482 if (Access != AS_none)
1483 ConsumeToken();
1484
1485 // Parse the 'virtual' keyword (again!), in case it came after the
1486 // access specifier.
1487 if (Tok.is(tok::kw_virtual)) {
1488 SourceLocation VirtualLoc = ConsumeToken();
1489 if (IsVirtual) {
1490 // Complain about duplicate 'virtual'
1491 Diag(VirtualLoc, diag::err_dup_virtual)
1492 << FixItHint::CreateRemoval(VirtualLoc);
1493 }
1494
1495 IsVirtual = true;
1496 }
1497
1498 // Parse the class-name.
1499 SourceLocation EndLocation;
1500 SourceLocation BaseLoc;
1501 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
1502 if (BaseType.isInvalid())
1503 return true;
1504
1505 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1506 // actually part of the base-specifier-list grammar productions, but we
1507 // parse it here for convenience.
1508 SourceLocation EllipsisLoc;
1509 if (Tok.is(tok::ellipsis))
1510 EllipsisLoc = ConsumeToken();
1511
1512 // Find the complete source range for the base-specifier.
1513 SourceRange Range(StartLoc, EndLocation);
1514
1515 // Notify semantic analysis that we have parsed a complete
1516 // base-specifier.
1517 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1518 BaseType.get(), BaseLoc, EllipsisLoc);
1519 }
1520
1521 /// getAccessSpecifierIfPresent - Determine whether the next token is
1522 /// a C++ access-specifier.
1523 ///
1524 /// access-specifier: [C++ class.derived]
1525 /// 'private'
1526 /// 'protected'
1527 /// 'public'
getAccessSpecifierIfPresent() const1528 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1529 switch (Tok.getKind()) {
1530 default: return AS_none;
1531 case tok::kw_private: return AS_private;
1532 case tok::kw_protected: return AS_protected;
1533 case tok::kw_public: return AS_public;
1534 }
1535 }
1536
1537 /// \brief If the given declarator has any parts for which parsing has to be
1538 /// delayed, e.g., default arguments or an exception-specification, create a
1539 /// late-parsed method declaration record to handle the parsing at the end of
1540 /// the class definition.
HandleMemberFunctionDeclDelays(Declarator & DeclaratorInfo,Decl * ThisDecl)1541 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
1542 Decl *ThisDecl) {
1543 // We just declared a member function. If this member function
1544 // has any default arguments or an exception-specification, we'll need to
1545 // parse them later.
1546 LateParsedMethodDeclaration *LateMethod = 0;
1547 DeclaratorChunk::FunctionTypeInfo &FTI
1548 = DeclaratorInfo.getFunctionTypeInfo();
1549
1550 // If there was a delayed exception-specification, hold onto its tokens.
1551 if (FTI.getExceptionSpecType() == EST_Delayed) {
1552 // Push this method onto the stack of late-parsed method
1553 // declarations.
1554 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1555 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1556 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1557
1558 // Stash the exception-specification tokens in the late-pased mthod.
1559 LateMethod->ExceptionSpecTokens = FTI.ExceptionSpecTokens;
1560 FTI.ExceptionSpecTokens = 0;
1561
1562 // Reserve space for the parameters.
1563 LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1564 }
1565
1566 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1567 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1568 if (!LateMethod) {
1569 // Push this method onto the stack of late-parsed method
1570 // declarations.
1571 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1572 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1573 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1574
1575 // Add all of the parameters prior to this one (they don't
1576 // have default arguments).
1577 LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1578 for (unsigned I = 0; I < ParamIdx; ++I)
1579 LateMethod->DefaultArgs.push_back(
1580 LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1581 }
1582
1583 // Add this parameter to the list of parameters (it may or may
1584 // not have a default argument).
1585 LateMethod->DefaultArgs.push_back(
1586 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1587 FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1588 }
1589 }
1590 }
1591
1592 /// isCXX0XVirtSpecifier - Determine whether the given token is a C++0x
1593 /// virt-specifier.
1594 ///
1595 /// virt-specifier:
1596 /// override
1597 /// final
isCXX0XVirtSpecifier(const Token & Tok) const1598 VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier(const Token &Tok) const {
1599 if (!getLangOpts().CPlusPlus)
1600 return VirtSpecifiers::VS_None;
1601
1602 if (Tok.is(tok::identifier)) {
1603 IdentifierInfo *II = Tok.getIdentifierInfo();
1604
1605 // Initialize the contextual keywords.
1606 if (!Ident_final) {
1607 Ident_final = &PP.getIdentifierTable().get("final");
1608 Ident_override = &PP.getIdentifierTable().get("override");
1609 }
1610
1611 if (II == Ident_override)
1612 return VirtSpecifiers::VS_Override;
1613
1614 if (II == Ident_final)
1615 return VirtSpecifiers::VS_Final;
1616 }
1617
1618 return VirtSpecifiers::VS_None;
1619 }
1620
1621 /// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq.
1622 ///
1623 /// virt-specifier-seq:
1624 /// virt-specifier
1625 /// virt-specifier-seq virt-specifier
ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers & VS)1626 void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) {
1627 while (true) {
1628 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier();
1629 if (Specifier == VirtSpecifiers::VS_None)
1630 return;
1631
1632 // C++ [class.mem]p8:
1633 // A virt-specifier-seq shall contain at most one of each virt-specifier.
1634 const char *PrevSpec = 0;
1635 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1636 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1637 << PrevSpec
1638 << FixItHint::CreateRemoval(Tok.getLocation());
1639
1640 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ?
1641 diag::warn_cxx98_compat_override_control_keyword :
1642 diag::ext_override_control_keyword)
1643 << VirtSpecifiers::getSpecifierName(Specifier);
1644 ConsumeToken();
1645 }
1646 }
1647
1648 /// isCXX0XFinalKeyword - Determine whether the next token is a C++0x
1649 /// contextual 'final' keyword.
isCXX0XFinalKeyword() const1650 bool Parser::isCXX0XFinalKeyword() const {
1651 if (!getLangOpts().CPlusPlus)
1652 return false;
1653
1654 if (!Tok.is(tok::identifier))
1655 return false;
1656
1657 // Initialize the contextual keywords.
1658 if (!Ident_final) {
1659 Ident_final = &PP.getIdentifierTable().get("final");
1660 Ident_override = &PP.getIdentifierTable().get("override");
1661 }
1662
1663 return Tok.getIdentifierInfo() == Ident_final;
1664 }
1665
1666 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1667 ///
1668 /// member-declaration:
1669 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
1670 /// function-definition ';'[opt]
1671 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1672 /// using-declaration [TODO]
1673 /// [C++0x] static_assert-declaration
1674 /// template-declaration
1675 /// [GNU] '__extension__' member-declaration
1676 ///
1677 /// member-declarator-list:
1678 /// member-declarator
1679 /// member-declarator-list ',' member-declarator
1680 ///
1681 /// member-declarator:
1682 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
1683 /// declarator constant-initializer[opt]
1684 /// [C++11] declarator brace-or-equal-initializer[opt]
1685 /// identifier[opt] ':' constant-expression
1686 ///
1687 /// virt-specifier-seq:
1688 /// virt-specifier
1689 /// virt-specifier-seq virt-specifier
1690 ///
1691 /// virt-specifier:
1692 /// override
1693 /// final
1694 ///
1695 /// pure-specifier:
1696 /// '= 0'
1697 ///
1698 /// constant-initializer:
1699 /// '=' constant-expression
1700 ///
ParseCXXClassMemberDeclaration(AccessSpecifier AS,AttributeList * AccessAttrs,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject * TemplateDiags)1701 void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1702 AttributeList *AccessAttrs,
1703 const ParsedTemplateInfo &TemplateInfo,
1704 ParsingDeclRAIIObject *TemplateDiags) {
1705 if (Tok.is(tok::at)) {
1706 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1707 Diag(Tok, diag::err_at_defs_cxx);
1708 else
1709 Diag(Tok, diag::err_at_in_class);
1710
1711 ConsumeToken();
1712 SkipUntil(tok::r_brace);
1713 return;
1714 }
1715
1716 // Access declarations.
1717 if (!TemplateInfo.Kind &&
1718 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1719 !TryAnnotateCXXScopeToken() &&
1720 Tok.is(tok::annot_cxxscope)) {
1721 bool isAccessDecl = false;
1722 if (NextToken().is(tok::identifier))
1723 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1724 else
1725 isAccessDecl = NextToken().is(tok::kw_operator);
1726
1727 if (isAccessDecl) {
1728 // Collect the scope specifier token we annotated earlier.
1729 CXXScopeSpec SS;
1730 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1731 /*EnteringContext=*/false);
1732
1733 // Try to parse an unqualified-id.
1734 SourceLocation TemplateKWLoc;
1735 UnqualifiedId Name;
1736 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(),
1737 TemplateKWLoc, Name)) {
1738 SkipUntil(tok::semi);
1739 return;
1740 }
1741
1742 // TODO: recover from mistakenly-qualified operator declarations.
1743 if (ExpectAndConsume(tok::semi,
1744 diag::err_expected_semi_after,
1745 "access declaration",
1746 tok::semi))
1747 return;
1748
1749 Actions.ActOnUsingDeclaration(getCurScope(), AS,
1750 false, SourceLocation(),
1751 SS, Name,
1752 /* AttrList */ 0,
1753 /* IsTypeName */ false,
1754 SourceLocation());
1755 return;
1756 }
1757 }
1758
1759 // static_assert-declaration
1760 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1761 // FIXME: Check for templates
1762 SourceLocation DeclEnd;
1763 ParseStaticAssertDeclaration(DeclEnd);
1764 return;
1765 }
1766
1767 if (Tok.is(tok::kw_template)) {
1768 assert(!TemplateInfo.TemplateParams &&
1769 "Nested template improperly parsed?");
1770 SourceLocation DeclEnd;
1771 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1772 AS, AccessAttrs);
1773 return;
1774 }
1775
1776 // Handle: member-declaration ::= '__extension__' member-declaration
1777 if (Tok.is(tok::kw___extension__)) {
1778 // __extension__ silences extension warnings in the subexpression.
1779 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1780 ConsumeToken();
1781 return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
1782 TemplateInfo, TemplateDiags);
1783 }
1784
1785 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1786 // is a bitfield.
1787 ColonProtectionRAIIObject X(*this);
1788
1789 ParsedAttributesWithRange attrs(AttrFactory);
1790 // Optional C++0x attribute-specifier
1791 MaybeParseCXX0XAttributes(attrs);
1792 MaybeParseMicrosoftAttributes(attrs);
1793
1794 if (Tok.is(tok::kw_using)) {
1795 ProhibitAttributes(attrs);
1796
1797 // Eat 'using'.
1798 SourceLocation UsingLoc = ConsumeToken();
1799
1800 if (Tok.is(tok::kw_namespace)) {
1801 Diag(UsingLoc, diag::err_using_namespace_in_class);
1802 SkipUntil(tok::semi, true, true);
1803 } else {
1804 SourceLocation DeclEnd;
1805 // Otherwise, it must be a using-declaration or an alias-declaration.
1806 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
1807 UsingLoc, DeclEnd, AS);
1808 }
1809 return;
1810 }
1811
1812 // Hold late-parsed attributes so we can attach a Decl to them later.
1813 LateParsedAttrList CommonLateParsedAttrs;
1814
1815 // decl-specifier-seq:
1816 // Parse the common declaration-specifiers piece.
1817 ParsingDeclSpec DS(*this, TemplateDiags);
1818 DS.takeAttributesFrom(attrs);
1819 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class,
1820 &CommonLateParsedAttrs);
1821
1822 MultiTemplateParamsArg TemplateParams(Actions,
1823 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1824 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1825
1826 if (Tok.is(tok::semi)) {
1827 ConsumeToken();
1828 Decl *TheDecl =
1829 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
1830 DS.complete(TheDecl);
1831 return;
1832 }
1833
1834 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1835 VirtSpecifiers VS;
1836
1837 // Hold late-parsed attributes so we can attach a Decl to them later.
1838 LateParsedAttrList LateParsedAttrs;
1839
1840 SourceLocation EqualLoc;
1841 bool HasInitializer = false;
1842 ExprResult Init;
1843 if (Tok.isNot(tok::colon)) {
1844 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1845 ColonProtectionRAIIObject X(*this);
1846
1847 // Parse the first declarator.
1848 ParseDeclarator(DeclaratorInfo);
1849 // Error parsin g the declarator?
1850 if (!DeclaratorInfo.hasName()) {
1851 // If so, skip until the semi-colon or a }.
1852 SkipUntil(tok::r_brace, true, true);
1853 if (Tok.is(tok::semi))
1854 ConsumeToken();
1855 return;
1856 }
1857
1858 ParseOptionalCXX0XVirtSpecifierSeq(VS);
1859
1860 // If attributes exist after the declarator, but before an '{', parse them.
1861 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
1862
1863 // MSVC permits pure specifier on inline functions declared at class scope.
1864 // Hence check for =0 before checking for function definition.
1865 if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) &&
1866 DeclaratorInfo.isFunctionDeclarator() &&
1867 NextToken().is(tok::numeric_constant)) {
1868 EqualLoc = ConsumeToken();
1869 Init = ParseInitializer();
1870 if (Init.isInvalid())
1871 SkipUntil(tok::comma, true, true);
1872 else
1873 HasInitializer = true;
1874 }
1875
1876 FunctionDefinitionKind DefinitionKind = FDK_Declaration;
1877 // function-definition:
1878 //
1879 // In C++11, a non-function declarator followed by an open brace is a
1880 // braced-init-list for an in-class member initialization, not an
1881 // erroneous function definition.
1882 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus0x) {
1883 DefinitionKind = FDK_Definition;
1884 } else if (DeclaratorInfo.isFunctionDeclarator()) {
1885 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
1886 DefinitionKind = FDK_Definition;
1887 } else if (Tok.is(tok::equal)) {
1888 const Token &KW = NextToken();
1889 if (KW.is(tok::kw_default))
1890 DefinitionKind = FDK_Defaulted;
1891 else if (KW.is(tok::kw_delete))
1892 DefinitionKind = FDK_Deleted;
1893 }
1894 }
1895
1896 if (DefinitionKind) {
1897 if (!DeclaratorInfo.isFunctionDeclarator()) {
1898 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
1899 ConsumeBrace();
1900 SkipUntil(tok::r_brace, /*StopAtSemi*/false);
1901
1902 // Consume the optional ';'
1903 if (Tok.is(tok::semi))
1904 ConsumeToken();
1905 return;
1906 }
1907
1908 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1909 Diag(DeclaratorInfo.getIdentifierLoc(),
1910 diag::err_function_declared_typedef);
1911 // This recovery skips the entire function body. It would be nice
1912 // to simply call ParseCXXInlineMethodDef() below, however Sema
1913 // assumes the declarator represents a function, not a typedef.
1914 ConsumeBrace();
1915 SkipUntil(tok::r_brace, /*StopAtSemi*/false);
1916
1917 // Consume the optional ';'
1918 if (Tok.is(tok::semi))
1919 ConsumeToken();
1920 return;
1921 }
1922
1923 Decl *FunDecl =
1924 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
1925 VS, DefinitionKind, Init);
1926
1927 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
1928 CommonLateParsedAttrs[i]->addDecl(FunDecl);
1929 }
1930 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
1931 LateParsedAttrs[i]->addDecl(FunDecl);
1932 }
1933 LateParsedAttrs.clear();
1934
1935 // Consume the ';' - it's optional unless we have a delete or default
1936 if (Tok.is(tok::semi)) {
1937 ConsumeToken();
1938 }
1939
1940 return;
1941 }
1942 }
1943
1944 // member-declarator-list:
1945 // member-declarator
1946 // member-declarator-list ',' member-declarator
1947
1948 SmallVector<Decl *, 8> DeclsInGroup;
1949 ExprResult BitfieldSize;
1950 bool ExpectSemi = true;
1951
1952 while (1) {
1953 // member-declarator:
1954 // declarator pure-specifier[opt]
1955 // declarator brace-or-equal-initializer[opt]
1956 // identifier[opt] ':' constant-expression
1957 if (Tok.is(tok::colon)) {
1958 ConsumeToken();
1959 BitfieldSize = ParseConstantExpression();
1960 if (BitfieldSize.isInvalid())
1961 SkipUntil(tok::comma, true, true);
1962 }
1963
1964 // If a simple-asm-expr is present, parse it.
1965 if (Tok.is(tok::kw_asm)) {
1966 SourceLocation Loc;
1967 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1968 if (AsmLabel.isInvalid())
1969 SkipUntil(tok::comma, true, true);
1970
1971 DeclaratorInfo.setAsmLabel(AsmLabel.release());
1972 DeclaratorInfo.SetRangeEnd(Loc);
1973 }
1974
1975 // If attributes exist after the declarator, parse them.
1976 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
1977
1978 // FIXME: When g++ adds support for this, we'll need to check whether it
1979 // goes before or after the GNU attributes and __asm__.
1980 ParseOptionalCXX0XVirtSpecifierSeq(VS);
1981
1982 bool HasDeferredInitializer = false;
1983 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) {
1984 if (BitfieldSize.get()) {
1985 Diag(Tok, diag::err_bitfield_member_init);
1986 SkipUntil(tok::comma, true, true);
1987 } else {
1988 HasInitializer = true;
1989 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() &&
1990 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1991 != DeclSpec::SCS_static &&
1992 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1993 != DeclSpec::SCS_typedef;
1994 }
1995 }
1996
1997 // NOTE: If Sema is the Action module and declarator is an instance field,
1998 // this call will *not* return the created decl; It will return null.
1999 // See Sema::ActOnCXXMemberDeclarator for details.
2000
2001 Decl *ThisDecl = 0;
2002 if (DS.isFriendSpecified()) {
2003 // TODO: handle initializers, bitfields, 'delete'
2004 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2005 move(TemplateParams));
2006 } else {
2007 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2008 DeclaratorInfo,
2009 move(TemplateParams),
2010 BitfieldSize.release(),
2011 VS, HasDeferredInitializer);
2012 if (AccessAttrs)
2013 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs,
2014 false, true);
2015 }
2016
2017 // Set the Decl for any late parsed attributes
2018 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2019 CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2020 }
2021 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2022 LateParsedAttrs[i]->addDecl(ThisDecl);
2023 }
2024 LateParsedAttrs.clear();
2025
2026 // Handle the initializer.
2027 if (HasDeferredInitializer) {
2028 // The initializer was deferred; parse it and cache the tokens.
2029 Diag(Tok, getLangOpts().CPlusPlus0x ?
2030 diag::warn_cxx98_compat_nonstatic_member_init :
2031 diag::ext_nonstatic_member_init);
2032
2033 if (DeclaratorInfo.isArrayOfUnknownBound()) {
2034 // C++0x [dcl.array]p3: An array bound may also be omitted when the
2035 // declarator is followed by an initializer.
2036 //
2037 // A brace-or-equal-initializer for a member-declarator is not an
2038 // initializer in the grammar, so this is ill-formed.
2039 Diag(Tok, diag::err_incomplete_array_member_init);
2040 SkipUntil(tok::comma, true, true);
2041 if (ThisDecl)
2042 // Avoid later warnings about a class member of incomplete type.
2043 ThisDecl->setInvalidDecl();
2044 } else
2045 ParseCXXNonStaticMemberInitializer(ThisDecl);
2046 } else if (HasInitializer) {
2047 // Normal initializer.
2048 if (!Init.isUsable())
2049 Init = ParseCXXMemberInitializer(ThisDecl,
2050 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2051
2052 if (Init.isInvalid())
2053 SkipUntil(tok::comma, true, true);
2054 else if (ThisDecl)
2055 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(),
2056 DS.getTypeSpecType() == DeclSpec::TST_auto);
2057 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) {
2058 // No initializer.
2059 Actions.ActOnUninitializedDecl(ThisDecl,
2060 DS.getTypeSpecType() == DeclSpec::TST_auto);
2061 }
2062
2063 if (ThisDecl) {
2064 Actions.FinalizeDeclaration(ThisDecl);
2065 DeclsInGroup.push_back(ThisDecl);
2066 }
2067
2068 if (DeclaratorInfo.isFunctionDeclarator() &&
2069 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
2070 != DeclSpec::SCS_typedef) {
2071 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2072 }
2073
2074 DeclaratorInfo.complete(ThisDecl);
2075
2076 // If we don't have a comma, it is either the end of the list (a ';')
2077 // or an error, bail out.
2078 if (Tok.isNot(tok::comma))
2079 break;
2080
2081 // Consume the comma.
2082 SourceLocation CommaLoc = ConsumeToken();
2083
2084 if (Tok.isAtStartOfLine() &&
2085 !MightBeDeclarator(Declarator::MemberContext)) {
2086 // This comma was followed by a line-break and something which can't be
2087 // the start of a declarator. The comma was probably a typo for a
2088 // semicolon.
2089 Diag(CommaLoc, diag::err_expected_semi_declaration)
2090 << FixItHint::CreateReplacement(CommaLoc, ";");
2091 ExpectSemi = false;
2092 break;
2093 }
2094
2095 // Parse the next declarator.
2096 DeclaratorInfo.clear();
2097 VS.clear();
2098 BitfieldSize = true;
2099 Init = true;
2100 HasInitializer = false;
2101 DeclaratorInfo.setCommaLoc(CommaLoc);
2102
2103 // Attributes are only allowed on the second declarator.
2104 MaybeParseGNUAttributes(DeclaratorInfo);
2105
2106 if (Tok.isNot(tok::colon))
2107 ParseDeclarator(DeclaratorInfo);
2108 }
2109
2110 if (ExpectSemi &&
2111 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2112 // Skip to end of block or statement.
2113 SkipUntil(tok::r_brace, true, true);
2114 // If we stopped at a ';', eat it.
2115 if (Tok.is(tok::semi)) ConsumeToken();
2116 return;
2117 }
2118
2119 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
2120 DeclsInGroup.size());
2121 }
2122
2123 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or
2124 /// pure-specifier. Also detect and reject any attempted defaulted/deleted
2125 /// function definition. The location of the '=', if any, will be placed in
2126 /// EqualLoc.
2127 ///
2128 /// pure-specifier:
2129 /// '= 0'
2130 ///
2131 /// brace-or-equal-initializer:
2132 /// '=' initializer-expression
2133 /// braced-init-list
2134 ///
2135 /// initializer-clause:
2136 /// assignment-expression
2137 /// braced-init-list
2138 ///
2139 /// defaulted/deleted function-definition:
2140 /// '=' 'default'
2141 /// '=' 'delete'
2142 ///
2143 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2144 /// be a constant-expression.
ParseCXXMemberInitializer(Decl * D,bool IsFunction,SourceLocation & EqualLoc)2145 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2146 SourceLocation &EqualLoc) {
2147 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace))
2148 && "Data member initializer not starting with '=' or '{'");
2149
2150 EnterExpressionEvaluationContext Context(Actions,
2151 Sema::PotentiallyEvaluated,
2152 D);
2153 if (Tok.is(tok::equal)) {
2154 EqualLoc = ConsumeToken();
2155 if (Tok.is(tok::kw_delete)) {
2156 // In principle, an initializer of '= delete p;' is legal, but it will
2157 // never type-check. It's better to diagnose it as an ill-formed expression
2158 // than as an ill-formed deleted non-function member.
2159 // An initializer of '= delete p, foo' will never be parsed, because
2160 // a top-level comma always ends the initializer expression.
2161 const Token &Next = NextToken();
2162 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) ||
2163 Next.is(tok::eof)) {
2164 if (IsFunction)
2165 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2166 << 1 /* delete */;
2167 else
2168 Diag(ConsumeToken(), diag::err_deleted_non_function);
2169 return ExprResult();
2170 }
2171 } else if (Tok.is(tok::kw_default)) {
2172 if (IsFunction)
2173 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2174 << 0 /* default */;
2175 else
2176 Diag(ConsumeToken(), diag::err_default_special_members);
2177 return ExprResult();
2178 }
2179
2180 }
2181 return ParseInitializer();
2182 }
2183
2184 /// ParseCXXMemberSpecification - Parse the class definition.
2185 ///
2186 /// member-specification:
2187 /// member-declaration member-specification[opt]
2188 /// access-specifier ':' member-specification[opt]
2189 ///
ParseCXXMemberSpecification(SourceLocation RecordLoc,unsigned TagType,Decl * TagDecl)2190 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
2191 unsigned TagType, Decl *TagDecl) {
2192 assert((TagType == DeclSpec::TST_struct ||
2193 TagType == DeclSpec::TST_union ||
2194 TagType == DeclSpec::TST_class) && "Invalid TagType!");
2195
2196 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2197 "parsing struct/union/class body");
2198
2199 // Determine whether this is a non-nested class. Note that local
2200 // classes are *not* considered to be nested classes.
2201 bool NonNestedClass = true;
2202 if (!ClassStack.empty()) {
2203 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2204 if (S->isClassScope()) {
2205 // We're inside a class scope, so this is a nested class.
2206 NonNestedClass = false;
2207 break;
2208 }
2209
2210 if ((S->getFlags() & Scope::FnScope)) {
2211 // If we're in a function or function template declared in the
2212 // body of a class, then this is a local class rather than a
2213 // nested class.
2214 const Scope *Parent = S->getParent();
2215 if (Parent->isTemplateParamScope())
2216 Parent = Parent->getParent();
2217 if (Parent->isClassScope())
2218 break;
2219 }
2220 }
2221 }
2222
2223 // Enter a scope for the class.
2224 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2225
2226 // Note that we are parsing a new (potentially-nested) class definition.
2227 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
2228
2229 if (TagDecl)
2230 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2231
2232 SourceLocation FinalLoc;
2233
2234 // Parse the optional 'final' keyword.
2235 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2236 assert(isCXX0XFinalKeyword() && "not a class definition");
2237 FinalLoc = ConsumeToken();
2238
2239 Diag(FinalLoc, getLangOpts().CPlusPlus0x ?
2240 diag::warn_cxx98_compat_override_control_keyword :
2241 diag::ext_override_control_keyword) << "final";
2242 }
2243
2244 if (Tok.is(tok::colon)) {
2245 ParseBaseClause(TagDecl);
2246
2247 if (!Tok.is(tok::l_brace)) {
2248 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
2249
2250 if (TagDecl)
2251 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
2252 return;
2253 }
2254 }
2255
2256 assert(Tok.is(tok::l_brace));
2257 BalancedDelimiterTracker T(*this, tok::l_brace);
2258 T.consumeOpen();
2259
2260 if (TagDecl)
2261 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
2262 T.getOpenLocation());
2263
2264 // C++ 11p3: Members of a class defined with the keyword class are private
2265 // by default. Members of a class defined with the keywords struct or union
2266 // are public by default.
2267 AccessSpecifier CurAS;
2268 if (TagType == DeclSpec::TST_class)
2269 CurAS = AS_private;
2270 else
2271 CurAS = AS_public;
2272 ParsedAttributes AccessAttrs(AttrFactory);
2273
2274 if (TagDecl) {
2275 // While we still have something to read, read the member-declarations.
2276 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
2277 // Each iteration of this loop reads one member-declaration.
2278
2279 if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) ||
2280 Tok.is(tok::kw___if_not_exists))) {
2281 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2282 continue;
2283 }
2284
2285 // Check for extraneous top-level semicolon.
2286 if (Tok.is(tok::semi)) {
2287 Diag(Tok, diag::ext_extra_struct_semi)
2288 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
2289 << FixItHint::CreateRemoval(Tok.getLocation());
2290 ConsumeToken();
2291 continue;
2292 }
2293
2294 if (Tok.is(tok::annot_pragma_vis)) {
2295 HandlePragmaVisibility();
2296 continue;
2297 }
2298
2299 if (Tok.is(tok::annot_pragma_pack)) {
2300 HandlePragmaPack();
2301 continue;
2302 }
2303
2304 AccessSpecifier AS = getAccessSpecifierIfPresent();
2305 if (AS != AS_none) {
2306 // Current token is a C++ access specifier.
2307 CurAS = AS;
2308 SourceLocation ASLoc = Tok.getLocation();
2309 unsigned TokLength = Tok.getLength();
2310 ConsumeToken();
2311 AccessAttrs.clear();
2312 MaybeParseGNUAttributes(AccessAttrs);
2313
2314 SourceLocation EndLoc;
2315 if (Tok.is(tok::colon)) {
2316 EndLoc = Tok.getLocation();
2317 ConsumeToken();
2318 } else if (Tok.is(tok::semi)) {
2319 EndLoc = Tok.getLocation();
2320 ConsumeToken();
2321 Diag(EndLoc, diag::err_expected_colon)
2322 << FixItHint::CreateReplacement(EndLoc, ":");
2323 } else {
2324 EndLoc = ASLoc.getLocWithOffset(TokLength);
2325 Diag(EndLoc, diag::err_expected_colon)
2326 << FixItHint::CreateInsertion(EndLoc, ":");
2327 }
2328
2329 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc,
2330 AccessAttrs.getList())) {
2331 // found another attribute than only annotations
2332 AccessAttrs.clear();
2333 }
2334
2335 continue;
2336 }
2337
2338 // FIXME: Make sure we don't have a template here.
2339
2340 // Parse all the comma separated declarators.
2341 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList());
2342 }
2343
2344 T.consumeClose();
2345 } else {
2346 SkipUntil(tok::r_brace, false, false);
2347 }
2348
2349 // If attributes exist after class contents, parse them.
2350 ParsedAttributes attrs(AttrFactory);
2351 MaybeParseGNUAttributes(attrs);
2352
2353 if (TagDecl)
2354 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
2355 T.getOpenLocation(),
2356 T.getCloseLocation(),
2357 attrs.getList());
2358
2359 // C++11 [class.mem]p2:
2360 // Within the class member-specification, the class is regarded as complete
2361 // within function bodies, default arguments, exception-specifications, and
2362 // brace-or-equal-initializers for non-static data members (including such
2363 // things in nested classes).
2364 if (TagDecl && NonNestedClass) {
2365 // We are not inside a nested class. This class and its nested classes
2366 // are complete and we can parse the delayed portions of method
2367 // declarations and the lexed inline method definitions, along with any
2368 // delayed attributes.
2369 SourceLocation SavedPrevTokLocation = PrevTokLocation;
2370 ParseLexedAttributes(getCurrentClass());
2371 ParseLexedMethodDeclarations(getCurrentClass());
2372 ParseLexedMemberInitializers(getCurrentClass());
2373 ParseLexedMethodDefs(getCurrentClass());
2374 PrevTokLocation = SavedPrevTokLocation;
2375 }
2376
2377 if (TagDecl)
2378 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl,
2379 T.getCloseLocation());
2380
2381 // Leave the class scope.
2382 ParsingDef.Pop();
2383 ClassScope.Exit();
2384 }
2385
2386 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
2387 /// which explicitly initializes the members or base classes of a
2388 /// class (C++ [class.base.init]). For example, the three initializers
2389 /// after the ':' in the Derived constructor below:
2390 ///
2391 /// @code
2392 /// class Base { };
2393 /// class Derived : Base {
2394 /// int x;
2395 /// float f;
2396 /// public:
2397 /// Derived(float f) : Base(), x(17), f(f) { }
2398 /// };
2399 /// @endcode
2400 ///
2401 /// [C++] ctor-initializer:
2402 /// ':' mem-initializer-list
2403 ///
2404 /// [C++] mem-initializer-list:
2405 /// mem-initializer ...[opt]
2406 /// mem-initializer ...[opt] , mem-initializer-list
ParseConstructorInitializer(Decl * ConstructorDecl)2407 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
2408 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
2409
2410 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
2411 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
2412 SourceLocation ColonLoc = ConsumeToken();
2413
2414 SmallVector<CXXCtorInitializer*, 4> MemInitializers;
2415 bool AnyErrors = false;
2416
2417 do {
2418 if (Tok.is(tok::code_completion)) {
2419 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
2420 MemInitializers.data(),
2421 MemInitializers.size());
2422 return cutOffParsing();
2423 } else {
2424 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
2425 if (!MemInit.isInvalid())
2426 MemInitializers.push_back(MemInit.get());
2427 else
2428 AnyErrors = true;
2429 }
2430
2431 if (Tok.is(tok::comma))
2432 ConsumeToken();
2433 else if (Tok.is(tok::l_brace))
2434 break;
2435 // If the next token looks like a base or member initializer, assume that
2436 // we're just missing a comma.
2437 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
2438 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
2439 Diag(Loc, diag::err_ctor_init_missing_comma)
2440 << FixItHint::CreateInsertion(Loc, ", ");
2441 } else {
2442 // Skip over garbage, until we get to '{'. Don't eat the '{'.
2443 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
2444 SkipUntil(tok::l_brace, true, true);
2445 break;
2446 }
2447 } while (true);
2448
2449 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
2450 MemInitializers.data(), MemInitializers.size(),
2451 AnyErrors);
2452 }
2453
2454 /// ParseMemInitializer - Parse a C++ member initializer, which is
2455 /// part of a constructor initializer that explicitly initializes one
2456 /// member or base class (C++ [class.base.init]). See
2457 /// ParseConstructorInitializer for an example.
2458 ///
2459 /// [C++] mem-initializer:
2460 /// mem-initializer-id '(' expression-list[opt] ')'
2461 /// [C++0x] mem-initializer-id braced-init-list
2462 ///
2463 /// [C++] mem-initializer-id:
2464 /// '::'[opt] nested-name-specifier[opt] class-name
2465 /// identifier
ParseMemInitializer(Decl * ConstructorDecl)2466 Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
2467 // parse '::'[opt] nested-name-specifier[opt]
2468 CXXScopeSpec SS;
2469 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
2470 ParsedType TemplateTypeTy;
2471 if (Tok.is(tok::annot_template_id)) {
2472 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2473 if (TemplateId->Kind == TNK_Type_template ||
2474 TemplateId->Kind == TNK_Dependent_template_name) {
2475 AnnotateTemplateIdTokenAsType();
2476 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2477 TemplateTypeTy = getTypeAnnotation(Tok);
2478 }
2479 }
2480 // Uses of decltype will already have been converted to annot_decltype by
2481 // ParseOptionalCXXScopeSpecifier at this point.
2482 if (!TemplateTypeTy && Tok.isNot(tok::identifier)
2483 && Tok.isNot(tok::annot_decltype)) {
2484 Diag(Tok, diag::err_expected_member_or_base_name);
2485 return true;
2486 }
2487
2488 IdentifierInfo *II = 0;
2489 DeclSpec DS(AttrFactory);
2490 SourceLocation IdLoc = Tok.getLocation();
2491 if (Tok.is(tok::annot_decltype)) {
2492 // Get the decltype expression, if there is one.
2493 ParseDecltypeSpecifier(DS);
2494 } else {
2495 if (Tok.is(tok::identifier))
2496 // Get the identifier. This may be a member name or a class name,
2497 // but we'll let the semantic analysis determine which it is.
2498 II = Tok.getIdentifierInfo();
2499 ConsumeToken();
2500 }
2501
2502
2503 // Parse the '('.
2504 if (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace)) {
2505 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2506
2507 ExprResult InitList = ParseBraceInitializer();
2508 if (InitList.isInvalid())
2509 return true;
2510
2511 SourceLocation EllipsisLoc;
2512 if (Tok.is(tok::ellipsis))
2513 EllipsisLoc = ConsumeToken();
2514
2515 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2516 TemplateTypeTy, DS, IdLoc,
2517 InitList.take(), EllipsisLoc);
2518 } else if(Tok.is(tok::l_paren)) {
2519 BalancedDelimiterTracker T(*this, tok::l_paren);
2520 T.consumeOpen();
2521
2522 // Parse the optional expression-list.
2523 ExprVector ArgExprs(Actions);
2524 CommaLocsTy CommaLocs;
2525 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2526 SkipUntil(tok::r_paren);
2527 return true;
2528 }
2529
2530 T.consumeClose();
2531
2532 SourceLocation EllipsisLoc;
2533 if (Tok.is(tok::ellipsis))
2534 EllipsisLoc = ConsumeToken();
2535
2536 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2537 TemplateTypeTy, DS, IdLoc,
2538 T.getOpenLocation(), ArgExprs.take(),
2539 ArgExprs.size(), T.getCloseLocation(),
2540 EllipsisLoc);
2541 }
2542
2543 Diag(Tok, getLangOpts().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace
2544 : diag::err_expected_lparen);
2545 return true;
2546 }
2547
2548 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2549 ///
2550 /// exception-specification:
2551 /// dynamic-exception-specification
2552 /// noexcept-specification
2553 ///
2554 /// noexcept-specification:
2555 /// 'noexcept'
2556 /// 'noexcept' '(' constant-expression ')'
2557 ExceptionSpecificationType
tryParseExceptionSpecification(bool Delayed,SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & DynamicExceptions,SmallVectorImpl<SourceRange> & DynamicExceptionRanges,ExprResult & NoexceptExpr,CachedTokens * & ExceptionSpecTokens)2558 Parser::tryParseExceptionSpecification(bool Delayed,
2559 SourceRange &SpecificationRange,
2560 SmallVectorImpl<ParsedType> &DynamicExceptions,
2561 SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2562 ExprResult &NoexceptExpr,
2563 CachedTokens *&ExceptionSpecTokens) {
2564 ExceptionSpecificationType Result = EST_None;
2565 ExceptionSpecTokens = 0;
2566
2567 // Handle delayed parsing of exception-specifications.
2568 if (Delayed) {
2569 if (Tok.isNot(tok::kw_throw) && Tok.isNot(tok::kw_noexcept))
2570 return EST_None;
2571
2572 // Consume and cache the starting token.
2573 bool IsNoexcept = Tok.is(tok::kw_noexcept);
2574 Token StartTok = Tok;
2575 SpecificationRange = SourceRange(ConsumeToken());
2576
2577 // Check for a '('.
2578 if (!Tok.is(tok::l_paren)) {
2579 // If this is a bare 'noexcept', we're done.
2580 if (IsNoexcept) {
2581 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
2582 NoexceptExpr = 0;
2583 return EST_BasicNoexcept;
2584 }
2585
2586 Diag(Tok, diag::err_expected_lparen_after) << "throw";
2587 return EST_DynamicNone;
2588 }
2589
2590 // Cache the tokens for the exception-specification.
2591 ExceptionSpecTokens = new CachedTokens;
2592 ExceptionSpecTokens->push_back(StartTok); // 'throw' or 'noexcept'
2593 ExceptionSpecTokens->push_back(Tok); // '('
2594 SpecificationRange.setEnd(ConsumeParen()); // '('
2595
2596 if (!ConsumeAndStoreUntil(tok::r_paren, *ExceptionSpecTokens,
2597 /*StopAtSemi=*/true,
2598 /*ConsumeFinalToken=*/true)) {
2599 NoexceptExpr = 0;
2600 delete ExceptionSpecTokens;
2601 ExceptionSpecTokens = 0;
2602 return IsNoexcept? EST_BasicNoexcept : EST_DynamicNone;
2603 }
2604 SpecificationRange.setEnd(Tok.getLocation());
2605
2606 // Add the 'stop' token.
2607 Token End;
2608 End.startToken();
2609 End.setKind(tok::cxx_exceptspec_end);
2610 End.setLocation(Tok.getLocation());
2611 ExceptionSpecTokens->push_back(End);
2612 return EST_Delayed;
2613 }
2614
2615 // See if there's a dynamic specification.
2616 if (Tok.is(tok::kw_throw)) {
2617 Result = ParseDynamicExceptionSpecification(SpecificationRange,
2618 DynamicExceptions,
2619 DynamicExceptionRanges);
2620 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2621 "Produced different number of exception types and ranges.");
2622 }
2623
2624 // If there's no noexcept specification, we're done.
2625 if (Tok.isNot(tok::kw_noexcept))
2626 return Result;
2627
2628 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
2629
2630 // If we already had a dynamic specification, parse the noexcept for,
2631 // recovery, but emit a diagnostic and don't store the results.
2632 SourceRange NoexceptRange;
2633 ExceptionSpecificationType NoexceptType = EST_None;
2634
2635 SourceLocation KeywordLoc = ConsumeToken();
2636 if (Tok.is(tok::l_paren)) {
2637 // There is an argument.
2638 BalancedDelimiterTracker T(*this, tok::l_paren);
2639 T.consumeOpen();
2640 NoexceptType = EST_ComputedNoexcept;
2641 NoexceptExpr = ParseConstantExpression();
2642 // The argument must be contextually convertible to bool. We use
2643 // ActOnBooleanCondition for this purpose.
2644 if (!NoexceptExpr.isInvalid())
2645 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2646 NoexceptExpr.get());
2647 T.consumeClose();
2648 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
2649 } else {
2650 // There is no argument.
2651 NoexceptType = EST_BasicNoexcept;
2652 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2653 }
2654
2655 if (Result == EST_None) {
2656 SpecificationRange = NoexceptRange;
2657 Result = NoexceptType;
2658
2659 // If there's a dynamic specification after a noexcept specification,
2660 // parse that and ignore the results.
2661 if (Tok.is(tok::kw_throw)) {
2662 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2663 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2664 DynamicExceptionRanges);
2665 }
2666 } else {
2667 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2668 }
2669
2670 return Result;
2671 }
2672
2673 /// ParseDynamicExceptionSpecification - Parse a C++
2674 /// dynamic-exception-specification (C++ [except.spec]).
2675 ///
2676 /// dynamic-exception-specification:
2677 /// 'throw' '(' type-id-list [opt] ')'
2678 /// [MS] 'throw' '(' '...' ')'
2679 ///
2680 /// type-id-list:
2681 /// type-id ... [opt]
2682 /// type-id-list ',' type-id ... [opt]
2683 ///
ParseDynamicExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & Exceptions,SmallVectorImpl<SourceRange> & Ranges)2684 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2685 SourceRange &SpecificationRange,
2686 SmallVectorImpl<ParsedType> &Exceptions,
2687 SmallVectorImpl<SourceRange> &Ranges) {
2688 assert(Tok.is(tok::kw_throw) && "expected throw");
2689
2690 SpecificationRange.setBegin(ConsumeToken());
2691 BalancedDelimiterTracker T(*this, tok::l_paren);
2692 if (T.consumeOpen()) {
2693 Diag(Tok, diag::err_expected_lparen_after) << "throw";
2694 SpecificationRange.setEnd(SpecificationRange.getBegin());
2695 return EST_DynamicNone;
2696 }
2697
2698 // Parse throw(...), a Microsoft extension that means "this function
2699 // can throw anything".
2700 if (Tok.is(tok::ellipsis)) {
2701 SourceLocation EllipsisLoc = ConsumeToken();
2702 if (!getLangOpts().MicrosoftExt)
2703 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2704 T.consumeClose();
2705 SpecificationRange.setEnd(T.getCloseLocation());
2706 return EST_MSAny;
2707 }
2708
2709 // Parse the sequence of type-ids.
2710 SourceRange Range;
2711 while (Tok.isNot(tok::r_paren)) {
2712 TypeResult Res(ParseTypeName(&Range));
2713
2714 if (Tok.is(tok::ellipsis)) {
2715 // C++0x [temp.variadic]p5:
2716 // - In a dynamic-exception-specification (15.4); the pattern is a
2717 // type-id.
2718 SourceLocation Ellipsis = ConsumeToken();
2719 Range.setEnd(Ellipsis);
2720 if (!Res.isInvalid())
2721 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2722 }
2723
2724 if (!Res.isInvalid()) {
2725 Exceptions.push_back(Res.get());
2726 Ranges.push_back(Range);
2727 }
2728
2729 if (Tok.is(tok::comma))
2730 ConsumeToken();
2731 else
2732 break;
2733 }
2734
2735 T.consumeClose();
2736 SpecificationRange.setEnd(T.getCloseLocation());
2737 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
2738 }
2739
2740 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
2741 /// function declaration.
ParseTrailingReturnType(SourceRange & Range)2742 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
2743 assert(Tok.is(tok::arrow) && "expected arrow");
2744
2745 ConsumeToken();
2746
2747 return ParseTypeName(&Range, Declarator::TrailingReturnContext);
2748 }
2749
2750 /// \brief We have just started parsing the definition of a new class,
2751 /// so push that class onto our stack of classes that is currently
2752 /// being parsed.
2753 Sema::ParsingClassState
PushParsingClass(Decl * ClassDecl,bool NonNestedClass)2754 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
2755 assert((NonNestedClass || !ClassStack.empty()) &&
2756 "Nested class without outer class");
2757 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
2758 return Actions.PushParsingClass();
2759 }
2760
2761 /// \brief Deallocate the given parsed class and all of its nested
2762 /// classes.
DeallocateParsedClasses(Parser::ParsingClass * Class)2763 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
2764 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
2765 delete Class->LateParsedDeclarations[I];
2766 delete Class;
2767 }
2768
2769 /// \brief Pop the top class of the stack of classes that are
2770 /// currently being parsed.
2771 ///
2772 /// This routine should be called when we have finished parsing the
2773 /// definition of a class, but have not yet popped the Scope
2774 /// associated with the class's definition.
2775 ///
2776 /// \returns true if the class we've popped is a top-level class,
2777 /// false otherwise.
PopParsingClass(Sema::ParsingClassState state)2778 void Parser::PopParsingClass(Sema::ParsingClassState state) {
2779 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
2780
2781 Actions.PopParsingClass(state);
2782
2783 ParsingClass *Victim = ClassStack.top();
2784 ClassStack.pop();
2785 if (Victim->TopLevelClass) {
2786 // Deallocate all of the nested classes of this class,
2787 // recursively: we don't need to keep any of this information.
2788 DeallocateParsedClasses(Victim);
2789 return;
2790 }
2791 assert(!ClassStack.empty() && "Missing top-level class?");
2792
2793 if (Victim->LateParsedDeclarations.empty()) {
2794 // The victim is a nested class, but we will not need to perform
2795 // any processing after the definition of this class since it has
2796 // no members whose handling was delayed. Therefore, we can just
2797 // remove this nested class.
2798 DeallocateParsedClasses(Victim);
2799 return;
2800 }
2801
2802 // This nested class has some members that will need to be processed
2803 // after the top-level class is completely defined. Therefore, add
2804 // it to the list of nested classes within its parent.
2805 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
2806 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
2807 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
2808 }
2809
2810 /// \brief Try to parse an 'identifier' which appears within an attribute-token.
2811 ///
2812 /// \return the parsed identifier on success, and 0 if the next token is not an
2813 /// attribute-token.
2814 ///
2815 /// C++11 [dcl.attr.grammar]p3:
2816 /// If a keyword or an alternative token that satisfies the syntactic
2817 /// requirements of an identifier is contained in an attribute-token,
2818 /// it is considered an identifier.
TryParseCXX11AttributeIdentifier(SourceLocation & Loc)2819 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
2820 switch (Tok.getKind()) {
2821 default:
2822 // Identifiers and keywords have identifier info attached.
2823 if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
2824 Loc = ConsumeToken();
2825 return II;
2826 }
2827 return 0;
2828
2829 case tok::ampamp: // 'and'
2830 case tok::pipe: // 'bitor'
2831 case tok::pipepipe: // 'or'
2832 case tok::caret: // 'xor'
2833 case tok::tilde: // 'compl'
2834 case tok::amp: // 'bitand'
2835 case tok::ampequal: // 'and_eq'
2836 case tok::pipeequal: // 'or_eq'
2837 case tok::caretequal: // 'xor_eq'
2838 case tok::exclaim: // 'not'
2839 case tok::exclaimequal: // 'not_eq'
2840 // Alternative tokens do not have identifier info, but their spelling
2841 // starts with an alphabetical character.
2842 llvm::SmallString<8> SpellingBuf;
2843 StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf);
2844 if (std::isalpha(Spelling[0])) {
2845 Loc = ConsumeToken();
2846 return &PP.getIdentifierTable().get(Spelling.data());
2847 }
2848 return 0;
2849 }
2850 }
2851
2852 /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently
2853 /// only parses standard attributes.
2854 ///
2855 /// [C++11] attribute-specifier:
2856 /// '[' '[' attribute-list ']' ']'
2857 /// alignment-specifier
2858 ///
2859 /// [C++11] attribute-list:
2860 /// attribute[opt]
2861 /// attribute-list ',' attribute[opt]
2862 /// attribute '...'
2863 /// attribute-list ',' attribute '...'
2864 ///
2865 /// [C++11] attribute:
2866 /// attribute-token attribute-argument-clause[opt]
2867 ///
2868 /// [C++11] attribute-token:
2869 /// identifier
2870 /// attribute-scoped-token
2871 ///
2872 /// [C++11] attribute-scoped-token:
2873 /// attribute-namespace '::' identifier
2874 ///
2875 /// [C++11] attribute-namespace:
2876 /// identifier
2877 ///
2878 /// [C++11] attribute-argument-clause:
2879 /// '(' balanced-token-seq ')'
2880 ///
2881 /// [C++11] balanced-token-seq:
2882 /// balanced-token
2883 /// balanced-token-seq balanced-token
2884 ///
2885 /// [C++11] balanced-token:
2886 /// '(' balanced-token-seq ')'
2887 /// '[' balanced-token-seq ']'
2888 /// '{' balanced-token-seq '}'
2889 /// any token but '(', ')', '[', ']', '{', or '}'
ParseCXX11AttributeSpecifier(ParsedAttributes & attrs,SourceLocation * endLoc)2890 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
2891 SourceLocation *endLoc) {
2892 if (Tok.is(tok::kw_alignas)) {
2893 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
2894 ParseAlignmentSpecifier(attrs, endLoc);
2895 return;
2896 }
2897
2898 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
2899 && "Not a C++11 attribute list");
2900
2901 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
2902
2903 ConsumeBracket();
2904 ConsumeBracket();
2905
2906 while (Tok.isNot(tok::r_square)) {
2907 // attribute not present
2908 if (Tok.is(tok::comma)) {
2909 ConsumeToken();
2910 continue;
2911 }
2912
2913 SourceLocation ScopeLoc, AttrLoc;
2914 IdentifierInfo *ScopeName = 0, *AttrName = 0;
2915
2916 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
2917 if (!AttrName)
2918 // Break out to the "expected ']'" diagnostic.
2919 break;
2920
2921 // scoped attribute
2922 if (Tok.is(tok::coloncolon)) {
2923 ConsumeToken();
2924
2925 ScopeName = AttrName;
2926 ScopeLoc = AttrLoc;
2927
2928 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
2929 if (!AttrName) {
2930 Diag(Tok.getLocation(), diag::err_expected_ident);
2931 SkipUntil(tok::r_square, tok::comma, true, true);
2932 continue;
2933 }
2934 }
2935
2936 bool AttrParsed = false;
2937 // No scoped names are supported; ideally we could put all non-standard
2938 // attributes into namespaces.
2939 if (!ScopeName) {
2940 switch (AttributeList::getKind(AttrName)) {
2941 // No arguments
2942 case AttributeList::AT_carries_dependency:
2943 case AttributeList::AT_noreturn: {
2944 if (Tok.is(tok::l_paren)) {
2945 Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments)
2946 << AttrName->getName();
2947 break;
2948 }
2949
2950 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0,
2951 SourceLocation(), 0, 0, false, true);
2952 AttrParsed = true;
2953 break;
2954 }
2955
2956 // Silence warnings
2957 default: break;
2958 }
2959 }
2960
2961 // Skip the entire parameter clause, if any
2962 if (!AttrParsed && Tok.is(tok::l_paren)) {
2963 ConsumeParen();
2964 // SkipUntil maintains the balancedness of tokens.
2965 SkipUntil(tok::r_paren, false);
2966 }
2967
2968 if (Tok.is(tok::ellipsis)) {
2969 if (AttrParsed)
2970 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
2971 << AttrName->getName();
2972 ConsumeToken();
2973 }
2974 }
2975
2976 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2977 SkipUntil(tok::r_square, false);
2978 if (endLoc)
2979 *endLoc = Tok.getLocation();
2980 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2981 SkipUntil(tok::r_square, false);
2982 }
2983
2984 /// ParseCXX11Attributes - Parse a C++0x attribute-specifier-seq.
2985 ///
2986 /// attribute-specifier-seq:
2987 /// attribute-specifier-seq[opt] attribute-specifier
ParseCXX11Attributes(ParsedAttributesWithRange & attrs,SourceLocation * endLoc)2988 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
2989 SourceLocation *endLoc) {
2990 SourceLocation StartLoc = Tok.getLocation(), Loc;
2991 if (!endLoc)
2992 endLoc = &Loc;
2993
2994 do {
2995 ParseCXX11AttributeSpecifier(attrs, endLoc);
2996 } while (isCXX11AttributeSpecifier());
2997
2998 attrs.Range = SourceRange(StartLoc, *endLoc);
2999 }
3000
3001 /// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
3002 ///
3003 /// [MS] ms-attribute:
3004 /// '[' token-seq ']'
3005 ///
3006 /// [MS] ms-attribute-seq:
3007 /// ms-attribute[opt]
3008 /// ms-attribute ms-attribute-seq
ParseMicrosoftAttributes(ParsedAttributes & attrs,SourceLocation * endLoc)3009 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
3010 SourceLocation *endLoc) {
3011 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
3012
3013 while (Tok.is(tok::l_square)) {
3014 // FIXME: If this is actually a C++11 attribute, parse it as one.
3015 ConsumeBracket();
3016 SkipUntil(tok::r_square, true, true);
3017 if (endLoc) *endLoc = Tok.getLocation();
3018 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
3019 }
3020 }
3021
ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,AccessSpecifier & CurAS)3022 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
3023 AccessSpecifier& CurAS) {
3024 IfExistsCondition Result;
3025 if (ParseMicrosoftIfExistsCondition(Result))
3026 return;
3027
3028 BalancedDelimiterTracker Braces(*this, tok::l_brace);
3029 if (Braces.consumeOpen()) {
3030 Diag(Tok, diag::err_expected_lbrace);
3031 return;
3032 }
3033
3034 switch (Result.Behavior) {
3035 case IEB_Parse:
3036 // Parse the declarations below.
3037 break;
3038
3039 case IEB_Dependent:
3040 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
3041 << Result.IsIfExists;
3042 // Fall through to skip.
3043
3044 case IEB_Skip:
3045 Braces.skipToEnd();
3046 return;
3047 }
3048
3049 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
3050 // __if_exists, __if_not_exists can nest.
3051 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) {
3052 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
3053 continue;
3054 }
3055
3056 // Check for extraneous top-level semicolon.
3057 if (Tok.is(tok::semi)) {
3058 Diag(Tok, diag::ext_extra_struct_semi)
3059 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
3060 << FixItHint::CreateRemoval(Tok.getLocation());
3061 ConsumeToken();
3062 continue;
3063 }
3064
3065 AccessSpecifier AS = getAccessSpecifierIfPresent();
3066 if (AS != AS_none) {
3067 // Current token is a C++ access specifier.
3068 CurAS = AS;
3069 SourceLocation ASLoc = Tok.getLocation();
3070 ConsumeToken();
3071 if (Tok.is(tok::colon))
3072 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
3073 else
3074 Diag(Tok, diag::err_expected_colon);
3075 ConsumeToken();
3076 continue;
3077 }
3078
3079 // Parse all the comma separated declarators.
3080 ParseCXXClassMemberDeclaration(CurAS, 0);
3081 }
3082
3083 Braces.consumeClose();
3084 }
3085