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 ParsedAttributesWithRange attrs(AttrFactory);
448
449 // FIXME: Simply skip the attributes and diagnose, don't bother parsing them.
450 MaybeParseCXX0XAttributes(attrs);
451 ProhibitAttributes(attrs);
452 attrs.clear();
453 attrs.Range = SourceRange();
454
455 // Ignore optional 'typename'.
456 // FIXME: This is wrong; we should parse this as a typename-specifier.
457 if (Tok.is(tok::kw_typename)) {
458 TypenameLoc = Tok.getLocation();
459 ConsumeToken();
460 IsTypeName = true;
461 }
462 else
463 IsTypeName = false;
464
465 // Parse nested-name-specifier.
466 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
467
468 // Check nested-name specifier.
469 if (SS.isInvalid()) {
470 SkipUntil(tok::semi);
471 return 0;
472 }
473
474 // Parse the unqualified-id. We allow parsing of both constructor and
475 // destructor names and allow the action module to diagnose any semantic
476 // errors.
477 SourceLocation TemplateKWLoc;
478 UnqualifiedId Name;
479 if (ParseUnqualifiedId(SS,
480 /*EnteringContext=*/false,
481 /*AllowDestructorName=*/true,
482 /*AllowConstructorName=*/true,
483 ParsedType(),
484 TemplateKWLoc,
485 Name)) {
486 SkipUntil(tok::semi);
487 return 0;
488 }
489
490 MaybeParseCXX0XAttributes(attrs);
491
492 // Maybe this is an alias-declaration.
493 bool IsAliasDecl = Tok.is(tok::equal);
494 TypeResult TypeAlias;
495 if (IsAliasDecl) {
496 // TODO: Attribute support. C++0x attributes may appear before the equals.
497 // Where can GNU attributes appear?
498 ConsumeToken();
499
500 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ?
501 diag::warn_cxx98_compat_alias_declaration :
502 diag::ext_alias_declaration);
503
504 // Type alias templates cannot be specialized.
505 int SpecKind = -1;
506 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
507 Name.getKind() == UnqualifiedId::IK_TemplateId)
508 SpecKind = 0;
509 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
510 SpecKind = 1;
511 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
512 SpecKind = 2;
513 if (SpecKind != -1) {
514 SourceRange Range;
515 if (SpecKind == 0)
516 Range = SourceRange(Name.TemplateId->LAngleLoc,
517 Name.TemplateId->RAngleLoc);
518 else
519 Range = TemplateInfo.getSourceRange();
520 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
521 << SpecKind << Range;
522 SkipUntil(tok::semi);
523 return 0;
524 }
525
526 // Name must be an identifier.
527 if (Name.getKind() != UnqualifiedId::IK_Identifier) {
528 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
529 // No removal fixit: can't recover from this.
530 SkipUntil(tok::semi);
531 return 0;
532 } else if (IsTypeName)
533 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
534 << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
535 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
536 else if (SS.isNotEmpty())
537 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
538 << FixItHint::CreateRemoval(SS.getRange());
539
540 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ?
541 Declarator::AliasTemplateContext :
542 Declarator::AliasDeclContext, AS, OwnedType);
543 } else {
544 // C++11 attributes are not allowed on a using-declaration, but GNU ones
545 // are.
546 ProhibitAttributes(attrs);
547
548 // Parse (optional) attributes (most likely GNU strong-using extension).
549 MaybeParseGNUAttributes(attrs);
550 }
551
552 // Eat ';'.
553 DeclEnd = Tok.getLocation();
554 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
555 !attrs.empty() ? "attributes list" :
556 IsAliasDecl ? "alias declaration" : "using declaration",
557 tok::semi);
558
559 // Diagnose an attempt to declare a templated using-declaration.
560 // In C++0x, alias-declarations can be templates:
561 // template <...> using id = type;
562 if (TemplateInfo.Kind && !IsAliasDecl) {
563 SourceRange R = TemplateInfo.getSourceRange();
564 Diag(UsingLoc, diag::err_templated_using_declaration)
565 << R << FixItHint::CreateRemoval(R);
566
567 // Unfortunately, we have to bail out instead of recovering by
568 // ignoring the parameters, just in case the nested name specifier
569 // depends on the parameters.
570 return 0;
571 }
572
573 // "typename" keyword is allowed for identifiers only,
574 // because it may be a type definition.
575 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) {
576 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only)
577 << FixItHint::CreateRemoval(SourceRange(TypenameLoc));
578 // Proceed parsing, but reset the IsTypeName flag.
579 IsTypeName = false;
580 }
581
582 if (IsAliasDecl) {
583 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
584 MultiTemplateParamsArg TemplateParamsArg(
585 TemplateParams ? TemplateParams->data() : 0,
586 TemplateParams ? TemplateParams->size() : 0);
587 // FIXME: Propagate attributes.
588 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
589 UsingLoc, Name, TypeAlias);
590 }
591
592 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS,
593 Name, attrs.getList(),
594 IsTypeName, TypenameLoc);
595 }
596
597 /// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
598 ///
599 /// [C++0x] static_assert-declaration:
600 /// static_assert ( constant-expression , string-literal ) ;
601 ///
602 /// [C11] static_assert-declaration:
603 /// _Static_assert ( constant-expression , string-literal ) ;
604 ///
ParseStaticAssertDeclaration(SourceLocation & DeclEnd)605 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
606 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
607 "Not a static_assert declaration");
608
609 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
610 Diag(Tok, diag::ext_c11_static_assert);
611 if (Tok.is(tok::kw_static_assert))
612 Diag(Tok, diag::warn_cxx98_compat_static_assert);
613
614 SourceLocation StaticAssertLoc = ConsumeToken();
615
616 BalancedDelimiterTracker T(*this, tok::l_paren);
617 if (T.consumeOpen()) {
618 Diag(Tok, diag::err_expected_lparen);
619 return 0;
620 }
621
622 ExprResult AssertExpr(ParseConstantExpression());
623 if (AssertExpr.isInvalid()) {
624 SkipUntil(tok::semi);
625 return 0;
626 }
627
628 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
629 return 0;
630
631 if (!isTokenStringLiteral()) {
632 Diag(Tok, diag::err_expected_string_literal);
633 SkipUntil(tok::semi);
634 return 0;
635 }
636
637 ExprResult AssertMessage(ParseStringLiteralExpression());
638 if (AssertMessage.isInvalid()) {
639 SkipUntil(tok::semi);
640 return 0;
641 }
642
643 T.consumeClose();
644
645 DeclEnd = Tok.getLocation();
646 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
647
648 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
649 AssertExpr.take(),
650 AssertMessage.take(),
651 T.getCloseLocation());
652 }
653
654 /// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
655 ///
656 /// 'decltype' ( expression )
657 ///
ParseDecltypeSpecifier(DeclSpec & DS)658 SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
659 assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype))
660 && "Not a decltype specifier");
661
662
663 ExprResult Result;
664 SourceLocation StartLoc = Tok.getLocation();
665 SourceLocation EndLoc;
666
667 if (Tok.is(tok::annot_decltype)) {
668 Result = getExprAnnotation(Tok);
669 EndLoc = Tok.getAnnotationEndLoc();
670 ConsumeToken();
671 if (Result.isInvalid()) {
672 DS.SetTypeSpecError();
673 return EndLoc;
674 }
675 } else {
676 if (Tok.getIdentifierInfo()->isStr("decltype"))
677 Diag(Tok, diag::warn_cxx98_compat_decltype);
678
679 ConsumeToken();
680
681 BalancedDelimiterTracker T(*this, tok::l_paren);
682 if (T.expectAndConsume(diag::err_expected_lparen_after,
683 "decltype", tok::r_paren)) {
684 DS.SetTypeSpecError();
685 return T.getOpenLocation() == Tok.getLocation() ?
686 StartLoc : T.getOpenLocation();
687 }
688
689 // Parse the expression
690
691 // C++0x [dcl.type.simple]p4:
692 // The operand of the decltype specifier is an unevaluated operand.
693 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
694 0, /*IsDecltype=*/true);
695 Result = ParseExpression();
696 if (Result.isInvalid()) {
697 SkipUntil(tok::r_paren);
698 DS.SetTypeSpecError();
699 return StartLoc;
700 }
701
702 // Match the ')'
703 T.consumeClose();
704 if (T.getCloseLocation().isInvalid()) {
705 DS.SetTypeSpecError();
706 // FIXME: this should return the location of the last token
707 // that was consumed (by "consumeClose()")
708 return T.getCloseLocation();
709 }
710
711 Result = Actions.ActOnDecltypeExpression(Result.take());
712 if (Result.isInvalid()) {
713 DS.SetTypeSpecError();
714 return T.getCloseLocation();
715 }
716
717 EndLoc = T.getCloseLocation();
718 }
719
720 const char *PrevSpec = 0;
721 unsigned DiagID;
722 // Check for duplicate type specifiers (e.g. "int decltype(a)").
723 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
724 DiagID, Result.release())) {
725 Diag(StartLoc, DiagID) << PrevSpec;
726 DS.SetTypeSpecError();
727 }
728 return EndLoc;
729 }
730
AnnotateExistingDecltypeSpecifier(const DeclSpec & DS,SourceLocation StartLoc,SourceLocation EndLoc)731 void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS,
732 SourceLocation StartLoc,
733 SourceLocation EndLoc) {
734 // make sure we have a token we can turn into an annotation token
735 if (PP.isBacktrackEnabled())
736 PP.RevertCachedTokens(1);
737 else
738 PP.EnterToken(Tok);
739
740 Tok.setKind(tok::annot_decltype);
741 setExprAnnotation(Tok, DS.getTypeSpecType() == TST_decltype ?
742 DS.getRepAsExpr() : ExprResult());
743 Tok.setAnnotationEndLoc(EndLoc);
744 Tok.setLocation(StartLoc);
745 PP.AnnotateCachedTokens(Tok);
746 }
747
ParseUnderlyingTypeSpecifier(DeclSpec & DS)748 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
749 assert(Tok.is(tok::kw___underlying_type) &&
750 "Not an underlying type specifier");
751
752 SourceLocation StartLoc = ConsumeToken();
753 BalancedDelimiterTracker T(*this, tok::l_paren);
754 if (T.expectAndConsume(diag::err_expected_lparen_after,
755 "__underlying_type", tok::r_paren)) {
756 return;
757 }
758
759 TypeResult Result = ParseTypeName();
760 if (Result.isInvalid()) {
761 SkipUntil(tok::r_paren);
762 return;
763 }
764
765 // Match the ')'
766 T.consumeClose();
767 if (T.getCloseLocation().isInvalid())
768 return;
769
770 const char *PrevSpec = 0;
771 unsigned DiagID;
772 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
773 DiagID, Result.release()))
774 Diag(StartLoc, DiagID) << PrevSpec;
775 }
776
777 /// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a
778 /// class name or decltype-specifier. Note that we only check that the result
779 /// names a type; semantic analysis will need to verify that the type names a
780 /// class. The result is either a type or null, depending on whether a type
781 /// name was found.
782 ///
783 /// base-type-specifier: [C++ 10.1]
784 /// class-or-decltype
785 /// class-or-decltype: [C++ 10.1]
786 /// nested-name-specifier[opt] class-name
787 /// decltype-specifier
788 /// class-name: [C++ 9.1]
789 /// identifier
790 /// simple-template-id
791 ///
ParseBaseTypeSpecifier(SourceLocation & BaseLoc,SourceLocation & EndLocation)792 Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc,
793 SourceLocation &EndLocation) {
794 // Ignore attempts to use typename
795 if (Tok.is(tok::kw_typename)) {
796 Diag(Tok, diag::err_expected_class_name_not_template)
797 << FixItHint::CreateRemoval(Tok.getLocation());
798 ConsumeToken();
799 }
800
801 // Parse optional nested-name-specifier
802 CXXScopeSpec SS;
803 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
804
805 BaseLoc = Tok.getLocation();
806
807 // Parse decltype-specifier
808 // tok == kw_decltype is just error recovery, it can only happen when SS
809 // isn't empty
810 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) {
811 if (SS.isNotEmpty())
812 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype)
813 << FixItHint::CreateRemoval(SS.getRange());
814 // Fake up a Declarator to use with ActOnTypeName.
815 DeclSpec DS(AttrFactory);
816
817 EndLocation = ParseDecltypeSpecifier(DS);
818
819 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
820 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
821 }
822
823 // Check whether we have a template-id that names a type.
824 if (Tok.is(tok::annot_template_id)) {
825 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
826 if (TemplateId->Kind == TNK_Type_template ||
827 TemplateId->Kind == TNK_Dependent_template_name) {
828 AnnotateTemplateIdTokenAsType();
829
830 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
831 ParsedType Type = getTypeAnnotation(Tok);
832 EndLocation = Tok.getAnnotationEndLoc();
833 ConsumeToken();
834
835 if (Type)
836 return Type;
837 return true;
838 }
839
840 // Fall through to produce an error below.
841 }
842
843 if (Tok.isNot(tok::identifier)) {
844 Diag(Tok, diag::err_expected_class_name);
845 return true;
846 }
847
848 IdentifierInfo *Id = Tok.getIdentifierInfo();
849 SourceLocation IdLoc = ConsumeToken();
850
851 if (Tok.is(tok::less)) {
852 // It looks the user intended to write a template-id here, but the
853 // template-name was wrong. Try to fix that.
854 TemplateNameKind TNK = TNK_Type_template;
855 TemplateTy Template;
856 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
857 &SS, Template, TNK)) {
858 Diag(IdLoc, diag::err_unknown_template_name)
859 << Id;
860 }
861
862 if (!Template)
863 return true;
864
865 // Form the template name
866 UnqualifiedId TemplateName;
867 TemplateName.setIdentifier(Id, IdLoc);
868
869 // Parse the full template-id, then turn it into a type.
870 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
871 TemplateName, true))
872 return true;
873 if (TNK == TNK_Dependent_template_name)
874 AnnotateTemplateIdTokenAsType();
875
876 // If we didn't end up with a typename token, there's nothing more we
877 // can do.
878 if (Tok.isNot(tok::annot_typename))
879 return true;
880
881 // Retrieve the type from the annotation token, consume that token, and
882 // return.
883 EndLocation = Tok.getAnnotationEndLoc();
884 ParsedType Type = getTypeAnnotation(Tok);
885 ConsumeToken();
886 return Type;
887 }
888
889 // We have an identifier; check whether it is actually a type.
890 IdentifierInfo *CorrectedII = 0;
891 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
892 false, ParsedType(),
893 /*IsCtorOrDtorName=*/false,
894 /*NonTrivialTypeSourceInfo=*/true,
895 &CorrectedII);
896 if (!Type) {
897 Diag(IdLoc, diag::err_expected_class_name);
898 return true;
899 }
900
901 // Consume the identifier.
902 EndLocation = IdLoc;
903
904 // Fake up a Declarator to use with ActOnTypeName.
905 DeclSpec DS(AttrFactory);
906 DS.SetRangeStart(IdLoc);
907 DS.SetRangeEnd(EndLocation);
908 DS.getTypeSpecScope() = SS;
909
910 const char *PrevSpec = 0;
911 unsigned DiagID;
912 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
913
914 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
915 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
916 }
917
ParseMicrosoftInheritanceClassAttributes(ParsedAttributes & attrs)918 void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) {
919 while (Tok.is(tok::kw___single_inheritance) ||
920 Tok.is(tok::kw___multiple_inheritance) ||
921 Tok.is(tok::kw___virtual_inheritance)) {
922 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
923 SourceLocation AttrNameLoc = ConsumeToken();
924 attrs.addNew(AttrName, AttrNameLoc, 0, AttrNameLoc, 0,
925 SourceLocation(), 0, 0, AttributeList::AS_GNU);
926 }
927 }
928
929 /// Determine whether the following tokens are valid after a type-specifier
930 /// which could be a standalone declaration. This will conservatively return
931 /// true if there's any doubt, and is appropriate for insert-';' fixits.
isValidAfterTypeSpecifier(bool CouldBeBitfield)932 bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
933 // This switch enumerates the valid "follow" set for type-specifiers.
934 switch (Tok.getKind()) {
935 default: break;
936 case tok::semi: // struct foo {...} ;
937 case tok::star: // struct foo {...} * P;
938 case tok::amp: // struct foo {...} & R = ...
939 case tok::identifier: // struct foo {...} V ;
940 case tok::r_paren: //(struct foo {...} ) {4}
941 case tok::annot_cxxscope: // struct foo {...} a:: b;
942 case tok::annot_typename: // struct foo {...} a ::b;
943 case tok::annot_template_id: // struct foo {...} a<int> ::b;
944 case tok::l_paren: // struct foo {...} ( x);
945 case tok::comma: // __builtin_offsetof(struct foo{...} ,
946 return true;
947 case tok::colon:
948 return CouldBeBitfield; // enum E { ... } : 2;
949 // Type qualifiers
950 case tok::kw_const: // struct foo {...} const x;
951 case tok::kw_volatile: // struct foo {...} volatile x;
952 case tok::kw_restrict: // struct foo {...} restrict x;
953 case tok::kw_inline: // struct foo {...} inline foo() {};
954 // Storage-class specifiers
955 case tok::kw_static: // struct foo {...} static x;
956 case tok::kw_extern: // struct foo {...} extern x;
957 case tok::kw_typedef: // struct foo {...} typedef x;
958 case tok::kw_register: // struct foo {...} register x;
959 case tok::kw_auto: // struct foo {...} auto x;
960 case tok::kw_mutable: // struct foo {...} mutable x;
961 case tok::kw_constexpr: // struct foo {...} constexpr x;
962 // As shown above, type qualifiers and storage class specifiers absolutely
963 // can occur after class specifiers according to the grammar. However,
964 // almost no one actually writes code like this. If we see one of these,
965 // it is much more likely that someone missed a semi colon and the
966 // type/storage class specifier we're seeing is part of the *next*
967 // intended declaration, as in:
968 //
969 // struct foo { ... }
970 // typedef int X;
971 //
972 // We'd really like to emit a missing semicolon error instead of emitting
973 // an error on the 'int' saying that you can't have two type specifiers in
974 // the same declaration of X. Because of this, we look ahead past this
975 // token to see if it's a type specifier. If so, we know the code is
976 // otherwise invalid, so we can produce the expected semi error.
977 if (!isKnownToBeTypeSpecifier(NextToken()))
978 return true;
979 break;
980 case tok::r_brace: // struct bar { struct foo {...} }
981 // Missing ';' at end of struct is accepted as an extension in C mode.
982 if (!getLangOpts().CPlusPlus)
983 return true;
984 break;
985 }
986 return false;
987 }
988
989 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
990 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
991 /// until we reach the start of a definition or see a token that
992 /// cannot start a definition.
993 ///
994 /// class-specifier: [C++ class]
995 /// class-head '{' member-specification[opt] '}'
996 /// class-head '{' member-specification[opt] '}' attributes[opt]
997 /// class-head:
998 /// class-key identifier[opt] base-clause[opt]
999 /// class-key nested-name-specifier identifier base-clause[opt]
1000 /// class-key nested-name-specifier[opt] simple-template-id
1001 /// base-clause[opt]
1002 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
1003 /// [GNU] class-key attributes[opt] nested-name-specifier
1004 /// identifier base-clause[opt]
1005 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
1006 /// simple-template-id base-clause[opt]
1007 /// class-key:
1008 /// 'class'
1009 /// 'struct'
1010 /// 'union'
1011 ///
1012 /// elaborated-type-specifier: [C++ dcl.type.elab]
1013 /// class-key ::[opt] nested-name-specifier[opt] identifier
1014 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
1015 /// simple-template-id
1016 ///
1017 /// Note that the C++ class-specifier and elaborated-type-specifier,
1018 /// together, subsume the C99 struct-or-union-specifier:
1019 ///
1020 /// struct-or-union-specifier: [C99 6.7.2.1]
1021 /// struct-or-union identifier[opt] '{' struct-contents '}'
1022 /// struct-or-union identifier
1023 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
1024 /// '}' attributes[opt]
1025 /// [GNU] struct-or-union attributes[opt] identifier
1026 /// struct-or-union:
1027 /// 'struct'
1028 /// 'union'
ParseClassSpecifier(tok::TokenKind TagTokKind,SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,bool EnteringContext,DeclSpecContext DSC)1029 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
1030 SourceLocation StartLoc, DeclSpec &DS,
1031 const ParsedTemplateInfo &TemplateInfo,
1032 AccessSpecifier AS,
1033 bool EnteringContext, DeclSpecContext DSC) {
1034 DeclSpec::TST TagType;
1035 if (TagTokKind == tok::kw_struct)
1036 TagType = DeclSpec::TST_struct;
1037 else if (TagTokKind == tok::kw___interface)
1038 TagType = DeclSpec::TST_interface;
1039 else if (TagTokKind == tok::kw_class)
1040 TagType = DeclSpec::TST_class;
1041 else {
1042 assert(TagTokKind == tok::kw_union && "Not a class specifier");
1043 TagType = DeclSpec::TST_union;
1044 }
1045
1046 if (Tok.is(tok::code_completion)) {
1047 // Code completion for a struct, class, or union name.
1048 Actions.CodeCompleteTag(getCurScope(), TagType);
1049 return cutOffParsing();
1050 }
1051
1052 // C++03 [temp.explicit] 14.7.2/8:
1053 // The usual access checking rules do not apply to names used to specify
1054 // explicit instantiations.
1055 //
1056 // As an extension we do not perform access checking on the names used to
1057 // specify explicit specializations either. This is important to allow
1058 // specializing traits classes for private types.
1059 //
1060 // Note that we don't suppress if this turns out to be an elaborated
1061 // type specifier.
1062 bool shouldDelayDiagsInTag =
1063 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
1064 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
1065 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
1066
1067 ParsedAttributesWithRange attrs(AttrFactory);
1068 // If attributes exist after tag, parse them.
1069 if (Tok.is(tok::kw___attribute))
1070 ParseGNUAttributes(attrs);
1071
1072 // If declspecs exist after tag, parse them.
1073 while (Tok.is(tok::kw___declspec))
1074 ParseMicrosoftDeclSpec(attrs);
1075
1076 // Parse inheritance specifiers.
1077 if (Tok.is(tok::kw___single_inheritance) ||
1078 Tok.is(tok::kw___multiple_inheritance) ||
1079 Tok.is(tok::kw___virtual_inheritance))
1080 ParseMicrosoftInheritanceClassAttributes(attrs);
1081
1082 // If C++0x attributes exist here, parse them.
1083 // FIXME: Are we consistent with the ordering of parsing of different
1084 // styles of attributes?
1085 MaybeParseCXX0XAttributes(attrs);
1086
1087 if (TagType == DeclSpec::TST_struct &&
1088 !Tok.is(tok::identifier) &&
1089 Tok.getIdentifierInfo() &&
1090 (Tok.is(tok::kw___is_arithmetic) ||
1091 Tok.is(tok::kw___is_convertible) ||
1092 Tok.is(tok::kw___is_empty) ||
1093 Tok.is(tok::kw___is_floating_point) ||
1094 Tok.is(tok::kw___is_function) ||
1095 Tok.is(tok::kw___is_fundamental) ||
1096 Tok.is(tok::kw___is_integral) ||
1097 Tok.is(tok::kw___is_member_function_pointer) ||
1098 Tok.is(tok::kw___is_member_pointer) ||
1099 Tok.is(tok::kw___is_pod) ||
1100 Tok.is(tok::kw___is_pointer) ||
1101 Tok.is(tok::kw___is_same) ||
1102 Tok.is(tok::kw___is_scalar) ||
1103 Tok.is(tok::kw___is_signed) ||
1104 Tok.is(tok::kw___is_unsigned) ||
1105 Tok.is(tok::kw___is_void))) {
1106 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the
1107 // name of struct templates, but some are keywords in GCC >= 4.3
1108 // and Clang. Therefore, when we see the token sequence "struct
1109 // X", make X into a normal identifier rather than a keyword, to
1110 // allow libstdc++ 4.2 and libc++ to work properly.
1111 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
1112 Tok.setKind(tok::identifier);
1113 }
1114
1115 // Parse the (optional) nested-name-specifier.
1116 CXXScopeSpec &SS = DS.getTypeSpecScope();
1117 if (getLangOpts().CPlusPlus) {
1118 // "FOO : BAR" is not a potential typo for "FOO::BAR".
1119 ColonProtectionRAIIObject X(*this);
1120
1121 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1122 DS.SetTypeSpecError();
1123 if (SS.isSet())
1124 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
1125 Diag(Tok, diag::err_expected_ident);
1126 }
1127
1128 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
1129
1130 // Parse the (optional) class name or simple-template-id.
1131 IdentifierInfo *Name = 0;
1132 SourceLocation NameLoc;
1133 TemplateIdAnnotation *TemplateId = 0;
1134 if (Tok.is(tok::identifier)) {
1135 Name = Tok.getIdentifierInfo();
1136 NameLoc = ConsumeToken();
1137
1138 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) {
1139 // The name was supposed to refer to a template, but didn't.
1140 // Eat the template argument list and try to continue parsing this as
1141 // a class (or template thereof).
1142 TemplateArgList TemplateArgs;
1143 SourceLocation LAngleLoc, RAngleLoc;
1144 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
1145 true, LAngleLoc,
1146 TemplateArgs, RAngleLoc)) {
1147 // We couldn't parse the template argument list at all, so don't
1148 // try to give any location information for the list.
1149 LAngleLoc = RAngleLoc = SourceLocation();
1150 }
1151
1152 Diag(NameLoc, diag::err_explicit_spec_non_template)
1153 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
1154 << (TagType == DeclSpec::TST_class? 0
1155 : TagType == DeclSpec::TST_struct? 1
1156 : TagType == DeclSpec::TST_interface? 2
1157 : 3)
1158 << Name
1159 << SourceRange(LAngleLoc, RAngleLoc);
1160
1161 // Strip off the last template parameter list if it was empty, since
1162 // we've removed its template argument list.
1163 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
1164 if (TemplateParams && TemplateParams->size() > 1) {
1165 TemplateParams->pop_back();
1166 } else {
1167 TemplateParams = 0;
1168 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1169 = ParsedTemplateInfo::NonTemplate;
1170 }
1171 } else if (TemplateInfo.Kind
1172 == ParsedTemplateInfo::ExplicitInstantiation) {
1173 // Pretend this is just a forward declaration.
1174 TemplateParams = 0;
1175 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
1176 = ParsedTemplateInfo::NonTemplate;
1177 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
1178 = SourceLocation();
1179 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
1180 = SourceLocation();
1181 }
1182 }
1183 } else if (Tok.is(tok::annot_template_id)) {
1184 TemplateId = takeTemplateIdAnnotation(Tok);
1185 NameLoc = ConsumeToken();
1186
1187 if (TemplateId->Kind != TNK_Type_template &&
1188 TemplateId->Kind != TNK_Dependent_template_name) {
1189 // The template-name in the simple-template-id refers to
1190 // something other than a class template. Give an appropriate
1191 // error message and skip to the ';'.
1192 SourceRange Range(NameLoc);
1193 if (SS.isNotEmpty())
1194 Range.setBegin(SS.getBeginLoc());
1195
1196 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
1197 << Name << static_cast<int>(TemplateId->Kind) << Range;
1198
1199 DS.SetTypeSpecError();
1200 SkipUntil(tok::semi, false, true);
1201 return;
1202 }
1203 }
1204
1205 // There are four options here.
1206 // - If we are in a trailing return type, this is always just a reference,
1207 // and we must not try to parse a definition. For instance,
1208 // [] () -> struct S { };
1209 // does not define a type.
1210 // - If we have 'struct foo {...', 'struct foo :...',
1211 // 'struct foo final :' or 'struct foo final {', then this is a definition.
1212 // - If we have 'struct foo;', then this is either a forward declaration
1213 // or a friend declaration, which have to be treated differently.
1214 // - Otherwise we have something like 'struct foo xyz', a reference.
1215 // However, in type-specifier-seq's, things look like declarations but are
1216 // just references, e.g.
1217 // new struct s;
1218 // or
1219 // &T::operator struct s;
1220 // For these, DSC is DSC_type_specifier.
1221 Sema::TagUseKind TUK;
1222 if (DSC == DSC_trailing)
1223 TUK = Sema::TUK_Reference;
1224 else if (Tok.is(tok::l_brace) ||
1225 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1226 (isCXX0XFinalKeyword() &&
1227 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) {
1228 if (DS.isFriendSpecified()) {
1229 // C++ [class.friend]p2:
1230 // A class shall not be defined in a friend declaration.
1231 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
1232 << SourceRange(DS.getFriendSpecLoc());
1233
1234 // Skip everything up to the semicolon, so that this looks like a proper
1235 // friend class (or template thereof) declaration.
1236 SkipUntil(tok::semi, true, true);
1237 TUK = Sema::TUK_Friend;
1238 } else {
1239 // Okay, this is a class definition.
1240 TUK = Sema::TUK_Definition;
1241 }
1242 } else if (DSC != DSC_type_specifier &&
1243 (Tok.is(tok::semi) ||
1244 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) {
1245 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1246 if (Tok.isNot(tok::semi)) {
1247 // A semicolon was missing after this declaration. Diagnose and recover.
1248 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1249 DeclSpec::getSpecifierName(TagType));
1250 PP.EnterToken(Tok);
1251 Tok.setKind(tok::semi);
1252 }
1253 } else
1254 TUK = Sema::TUK_Reference;
1255
1256 // If this is an elaborated type specifier, and we delayed
1257 // diagnostics before, just merge them into the current pool.
1258 if (shouldDelayDiagsInTag) {
1259 diagsFromTag.done();
1260 if (TUK == Sema::TUK_Reference)
1261 diagsFromTag.redelay();
1262 }
1263
1264 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1265 TUK != Sema::TUK_Definition)) {
1266 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1267 // We have a declaration or reference to an anonymous class.
1268 Diag(StartLoc, diag::err_anon_type_definition)
1269 << DeclSpec::getSpecifierName(TagType);
1270 }
1271
1272 SkipUntil(tok::comma, true);
1273 return;
1274 }
1275
1276 // Create the tag portion of the class or class template.
1277 DeclResult TagOrTempResult = true; // invalid
1278 TypeResult TypeResult = true; // invalid
1279
1280 bool Owned = false;
1281 if (TemplateId) {
1282 // Explicit specialization, class template partial specialization,
1283 // or explicit instantiation.
1284 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1285 TemplateId->NumArgs);
1286 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1287 TUK == Sema::TUK_Declaration) {
1288 // This is an explicit instantiation of a class template.
1289 ProhibitAttributes(attrs);
1290
1291 TagOrTempResult
1292 = Actions.ActOnExplicitInstantiation(getCurScope(),
1293 TemplateInfo.ExternLoc,
1294 TemplateInfo.TemplateLoc,
1295 TagType,
1296 StartLoc,
1297 SS,
1298 TemplateId->Template,
1299 TemplateId->TemplateNameLoc,
1300 TemplateId->LAngleLoc,
1301 TemplateArgsPtr,
1302 TemplateId->RAngleLoc,
1303 attrs.getList());
1304
1305 // Friend template-ids are treated as references unless
1306 // they have template headers, in which case they're ill-formed
1307 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1308 // We diagnose this error in ActOnClassTemplateSpecialization.
1309 } else if (TUK == Sema::TUK_Reference ||
1310 (TUK == Sema::TUK_Friend &&
1311 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1312 ProhibitAttributes(attrs);
1313 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc,
1314 TemplateId->SS,
1315 TemplateId->TemplateKWLoc,
1316 TemplateId->Template,
1317 TemplateId->TemplateNameLoc,
1318 TemplateId->LAngleLoc,
1319 TemplateArgsPtr,
1320 TemplateId->RAngleLoc);
1321 } else {
1322 // This is an explicit specialization or a class template
1323 // partial specialization.
1324 TemplateParameterLists FakedParamLists;
1325
1326 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1327 // This looks like an explicit instantiation, because we have
1328 // something like
1329 //
1330 // template class Foo<X>
1331 //
1332 // but it actually has a definition. Most likely, this was
1333 // meant to be an explicit specialization, but the user forgot
1334 // the '<>' after 'template'.
1335 assert(TUK == Sema::TUK_Definition && "Expected a definition here");
1336
1337 SourceLocation LAngleLoc
1338 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1339 Diag(TemplateId->TemplateNameLoc,
1340 diag::err_explicit_instantiation_with_definition)
1341 << SourceRange(TemplateInfo.TemplateLoc)
1342 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1343
1344 // Create a fake template parameter list that contains only
1345 // "template<>", so that we treat this construct as a class
1346 // template specialization.
1347 FakedParamLists.push_back(
1348 Actions.ActOnTemplateParameterList(0, SourceLocation(),
1349 TemplateInfo.TemplateLoc,
1350 LAngleLoc,
1351 0, 0,
1352 LAngleLoc));
1353 TemplateParams = &FakedParamLists;
1354 }
1355
1356 // Build the class template specialization.
1357 TagOrTempResult
1358 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
1359 StartLoc, DS.getModulePrivateSpecLoc(), SS,
1360 TemplateId->Template,
1361 TemplateId->TemplateNameLoc,
1362 TemplateId->LAngleLoc,
1363 TemplateArgsPtr,
1364 TemplateId->RAngleLoc,
1365 attrs.getList(),
1366 MultiTemplateParamsArg(
1367 TemplateParams? &(*TemplateParams)[0] : 0,
1368 TemplateParams? TemplateParams->size() : 0));
1369 }
1370 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1371 TUK == Sema::TUK_Declaration) {
1372 // Explicit instantiation of a member of a class template
1373 // specialization, e.g.,
1374 //
1375 // template struct Outer<int>::Inner;
1376 //
1377 ProhibitAttributes(attrs);
1378
1379 TagOrTempResult
1380 = Actions.ActOnExplicitInstantiation(getCurScope(),
1381 TemplateInfo.ExternLoc,
1382 TemplateInfo.TemplateLoc,
1383 TagType, StartLoc, SS, Name,
1384 NameLoc, attrs.getList());
1385 } else if (TUK == Sema::TUK_Friend &&
1386 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1387 ProhibitAttributes(attrs);
1388
1389 TagOrTempResult =
1390 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1391 TagType, StartLoc, SS,
1392 Name, NameLoc, attrs.getList(),
1393 MultiTemplateParamsArg(
1394 TemplateParams? &(*TemplateParams)[0] : 0,
1395 TemplateParams? TemplateParams->size() : 0));
1396 } else {
1397 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1398 TUK == Sema::TUK_Definition) {
1399 // FIXME: Diagnose this particular error.
1400 }
1401
1402 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition)
1403 ProhibitAttributes(attrs);
1404
1405 bool IsDependent = false;
1406
1407 // Don't pass down template parameter lists if this is just a tag
1408 // reference. For example, we don't need the template parameters here:
1409 // template <class T> class A *makeA(T t);
1410 MultiTemplateParamsArg TParams;
1411 if (TUK != Sema::TUK_Reference && TemplateParams)
1412 TParams =
1413 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1414
1415 // Declaration or definition of a class type
1416 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1417 SS, Name, NameLoc, attrs.getList(), AS,
1418 DS.getModulePrivateSpecLoc(),
1419 TParams, Owned, IsDependent,
1420 SourceLocation(), false,
1421 clang::TypeResult());
1422
1423 // If ActOnTag said the type was dependent, try again with the
1424 // less common call.
1425 if (IsDependent) {
1426 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1427 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1428 SS, Name, StartLoc, NameLoc);
1429 }
1430 }
1431
1432 // If there is a body, parse it and inform the actions module.
1433 if (TUK == Sema::TUK_Definition) {
1434 assert(Tok.is(tok::l_brace) ||
1435 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) ||
1436 isCXX0XFinalKeyword());
1437 if (getLangOpts().CPlusPlus)
1438 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
1439 else
1440 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1441 }
1442
1443 const char *PrevSpec = 0;
1444 unsigned DiagID;
1445 bool Result;
1446 if (!TypeResult.isInvalid()) {
1447 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1448 NameLoc.isValid() ? NameLoc : StartLoc,
1449 PrevSpec, DiagID, TypeResult.get());
1450 } else if (!TagOrTempResult.isInvalid()) {
1451 Result = DS.SetTypeSpecType(TagType, StartLoc,
1452 NameLoc.isValid() ? NameLoc : StartLoc,
1453 PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1454 } else {
1455 DS.SetTypeSpecError();
1456 return;
1457 }
1458
1459 if (Result)
1460 Diag(StartLoc, DiagID) << PrevSpec;
1461
1462 // At this point, we've successfully parsed a class-specifier in 'definition'
1463 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1464 // going to look at what comes after it to improve error recovery. If an
1465 // impossible token occurs next, we assume that the programmer forgot a ; at
1466 // the end of the declaration and recover that way.
1467 //
1468 // Also enforce C++ [temp]p3:
1469 // In a template-declaration which defines a class, no declarator
1470 // is permitted.
1471 if (TUK == Sema::TUK_Definition &&
1472 (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) {
1473 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1474 DeclSpec::getSpecifierName(TagType));
1475 // Push this token back into the preprocessor and change our current token
1476 // to ';' so that the rest of the code recovers as though there were an
1477 // ';' after the definition.
1478 PP.EnterToken(Tok);
1479 Tok.setKind(tok::semi);
1480 }
1481 }
1482
1483 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1484 ///
1485 /// base-clause : [C++ class.derived]
1486 /// ':' base-specifier-list
1487 /// base-specifier-list:
1488 /// base-specifier '...'[opt]
1489 /// base-specifier-list ',' base-specifier '...'[opt]
ParseBaseClause(Decl * ClassDecl)1490 void Parser::ParseBaseClause(Decl *ClassDecl) {
1491 assert(Tok.is(tok::colon) && "Not a base clause");
1492 ConsumeToken();
1493
1494 // Build up an array of parsed base specifiers.
1495 SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1496
1497 while (true) {
1498 // Parse a base-specifier.
1499 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1500 if (Result.isInvalid()) {
1501 // Skip the rest of this base specifier, up until the comma or
1502 // opening brace.
1503 SkipUntil(tok::comma, tok::l_brace, true, true);
1504 } else {
1505 // Add this to our array of base specifiers.
1506 BaseInfo.push_back(Result.get());
1507 }
1508
1509 // If the next token is a comma, consume it and keep reading
1510 // base-specifiers.
1511 if (Tok.isNot(tok::comma)) break;
1512
1513 // Consume the comma.
1514 ConsumeToken();
1515 }
1516
1517 // Attach the base specifiers
1518 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1519 }
1520
1521 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1522 /// one entry in the base class list of a class specifier, for example:
1523 /// class foo : public bar, virtual private baz {
1524 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1525 ///
1526 /// base-specifier: [C++ class.derived]
1527 /// ::[opt] nested-name-specifier[opt] class-name
1528 /// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1529 /// base-type-specifier
1530 /// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1531 /// base-type-specifier
ParseBaseSpecifier(Decl * ClassDecl)1532 Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1533 bool IsVirtual = false;
1534 SourceLocation StartLoc = Tok.getLocation();
1535
1536 // Parse the 'virtual' keyword.
1537 if (Tok.is(tok::kw_virtual)) {
1538 ConsumeToken();
1539 IsVirtual = true;
1540 }
1541
1542 // Parse an (optional) access specifier.
1543 AccessSpecifier Access = getAccessSpecifierIfPresent();
1544 if (Access != AS_none)
1545 ConsumeToken();
1546
1547 // Parse the 'virtual' keyword (again!), in case it came after the
1548 // access specifier.
1549 if (Tok.is(tok::kw_virtual)) {
1550 SourceLocation VirtualLoc = ConsumeToken();
1551 if (IsVirtual) {
1552 // Complain about duplicate 'virtual'
1553 Diag(VirtualLoc, diag::err_dup_virtual)
1554 << FixItHint::CreateRemoval(VirtualLoc);
1555 }
1556
1557 IsVirtual = true;
1558 }
1559
1560 // Parse the class-name.
1561 SourceLocation EndLocation;
1562 SourceLocation BaseLoc;
1563 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation);
1564 if (BaseType.isInvalid())
1565 return true;
1566
1567 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1568 // actually part of the base-specifier-list grammar productions, but we
1569 // parse it here for convenience.
1570 SourceLocation EllipsisLoc;
1571 if (Tok.is(tok::ellipsis))
1572 EllipsisLoc = ConsumeToken();
1573
1574 // Find the complete source range for the base-specifier.
1575 SourceRange Range(StartLoc, EndLocation);
1576
1577 // Notify semantic analysis that we have parsed a complete
1578 // base-specifier.
1579 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1580 BaseType.get(), BaseLoc, EllipsisLoc);
1581 }
1582
1583 /// getAccessSpecifierIfPresent - Determine whether the next token is
1584 /// a C++ access-specifier.
1585 ///
1586 /// access-specifier: [C++ class.derived]
1587 /// 'private'
1588 /// 'protected'
1589 /// 'public'
getAccessSpecifierIfPresent() const1590 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1591 switch (Tok.getKind()) {
1592 default: return AS_none;
1593 case tok::kw_private: return AS_private;
1594 case tok::kw_protected: return AS_protected;
1595 case tok::kw_public: return AS_public;
1596 }
1597 }
1598
1599 /// \brief If the given declarator has any parts for which parsing has to be
1600 /// delayed, e.g., default arguments, create a late-parsed method declaration
1601 /// record to handle the parsing at the end of the class definition.
HandleMemberFunctionDeclDelays(Declarator & DeclaratorInfo,Decl * ThisDecl)1602 void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo,
1603 Decl *ThisDecl) {
1604 // We just declared a member function. If this member function
1605 // has any default arguments, we'll need to parse them later.
1606 LateParsedMethodDeclaration *LateMethod = 0;
1607 DeclaratorChunk::FunctionTypeInfo &FTI
1608 = DeclaratorInfo.getFunctionTypeInfo();
1609
1610 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1611 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1612 if (!LateMethod) {
1613 // Push this method onto the stack of late-parsed method
1614 // declarations.
1615 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1616 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1617 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1618
1619 // Add all of the parameters prior to this one (they don't
1620 // have default arguments).
1621 LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1622 for (unsigned I = 0; I < ParamIdx; ++I)
1623 LateMethod->DefaultArgs.push_back(
1624 LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1625 }
1626
1627 // Add this parameter to the list of parameters (it may or may
1628 // not have a default argument).
1629 LateMethod->DefaultArgs.push_back(
1630 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1631 FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1632 }
1633 }
1634 }
1635
1636 /// isCXX0XVirtSpecifier - Determine whether the given token is a C++0x
1637 /// virt-specifier.
1638 ///
1639 /// virt-specifier:
1640 /// override
1641 /// final
isCXX0XVirtSpecifier(const Token & Tok) const1642 VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier(const Token &Tok) const {
1643 if (!getLangOpts().CPlusPlus)
1644 return VirtSpecifiers::VS_None;
1645
1646 if (Tok.is(tok::identifier)) {
1647 IdentifierInfo *II = Tok.getIdentifierInfo();
1648
1649 // Initialize the contextual keywords.
1650 if (!Ident_final) {
1651 Ident_final = &PP.getIdentifierTable().get("final");
1652 Ident_override = &PP.getIdentifierTable().get("override");
1653 }
1654
1655 if (II == Ident_override)
1656 return VirtSpecifiers::VS_Override;
1657
1658 if (II == Ident_final)
1659 return VirtSpecifiers::VS_Final;
1660 }
1661
1662 return VirtSpecifiers::VS_None;
1663 }
1664
1665 /// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq.
1666 ///
1667 /// virt-specifier-seq:
1668 /// virt-specifier
1669 /// virt-specifier-seq virt-specifier
ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers & VS)1670 void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) {
1671 while (true) {
1672 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier();
1673 if (Specifier == VirtSpecifiers::VS_None)
1674 return;
1675
1676 // C++ [class.mem]p8:
1677 // A virt-specifier-seq shall contain at most one of each virt-specifier.
1678 const char *PrevSpec = 0;
1679 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1680 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1681 << PrevSpec
1682 << FixItHint::CreateRemoval(Tok.getLocation());
1683
1684 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ?
1685 diag::warn_cxx98_compat_override_control_keyword :
1686 diag::ext_override_control_keyword)
1687 << VirtSpecifiers::getSpecifierName(Specifier);
1688 ConsumeToken();
1689 }
1690 }
1691
1692 /// isCXX0XFinalKeyword - Determine whether the next token is a C++0x
1693 /// contextual 'final' keyword.
isCXX0XFinalKeyword() const1694 bool Parser::isCXX0XFinalKeyword() const {
1695 if (!getLangOpts().CPlusPlus)
1696 return false;
1697
1698 if (!Tok.is(tok::identifier))
1699 return false;
1700
1701 // Initialize the contextual keywords.
1702 if (!Ident_final) {
1703 Ident_final = &PP.getIdentifierTable().get("final");
1704 Ident_override = &PP.getIdentifierTable().get("override");
1705 }
1706
1707 return Tok.getIdentifierInfo() == Ident_final;
1708 }
1709
1710 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1711 ///
1712 /// member-declaration:
1713 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
1714 /// function-definition ';'[opt]
1715 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1716 /// using-declaration [TODO]
1717 /// [C++0x] static_assert-declaration
1718 /// template-declaration
1719 /// [GNU] '__extension__' member-declaration
1720 ///
1721 /// member-declarator-list:
1722 /// member-declarator
1723 /// member-declarator-list ',' member-declarator
1724 ///
1725 /// member-declarator:
1726 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
1727 /// declarator constant-initializer[opt]
1728 /// [C++11] declarator brace-or-equal-initializer[opt]
1729 /// identifier[opt] ':' constant-expression
1730 ///
1731 /// virt-specifier-seq:
1732 /// virt-specifier
1733 /// virt-specifier-seq virt-specifier
1734 ///
1735 /// virt-specifier:
1736 /// override
1737 /// final
1738 ///
1739 /// pure-specifier:
1740 /// '= 0'
1741 ///
1742 /// constant-initializer:
1743 /// '=' constant-expression
1744 ///
ParseCXXClassMemberDeclaration(AccessSpecifier AS,AttributeList * AccessAttrs,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject * TemplateDiags)1745 void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1746 AttributeList *AccessAttrs,
1747 const ParsedTemplateInfo &TemplateInfo,
1748 ParsingDeclRAIIObject *TemplateDiags) {
1749 if (Tok.is(tok::at)) {
1750 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1751 Diag(Tok, diag::err_at_defs_cxx);
1752 else
1753 Diag(Tok, diag::err_at_in_class);
1754
1755 ConsumeToken();
1756 SkipUntil(tok::r_brace);
1757 return;
1758 }
1759
1760 // Access declarations.
1761 bool MalformedTypeSpec = false;
1762 if (!TemplateInfo.Kind &&
1763 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))) {
1764 if (TryAnnotateCXXScopeToken())
1765 MalformedTypeSpec = true;
1766
1767 bool isAccessDecl;
1768 if (Tok.isNot(tok::annot_cxxscope))
1769 isAccessDecl = false;
1770 else if (NextToken().is(tok::identifier))
1771 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1772 else
1773 isAccessDecl = NextToken().is(tok::kw_operator);
1774
1775 if (isAccessDecl) {
1776 // Collect the scope specifier token we annotated earlier.
1777 CXXScopeSpec SS;
1778 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1779 /*EnteringContext=*/false);
1780
1781 // Try to parse an unqualified-id.
1782 SourceLocation TemplateKWLoc;
1783 UnqualifiedId Name;
1784 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(),
1785 TemplateKWLoc, Name)) {
1786 SkipUntil(tok::semi);
1787 return;
1788 }
1789
1790 // TODO: recover from mistakenly-qualified operator declarations.
1791 if (ExpectAndConsume(tok::semi,
1792 diag::err_expected_semi_after,
1793 "access declaration",
1794 tok::semi))
1795 return;
1796
1797 Actions.ActOnUsingDeclaration(getCurScope(), AS,
1798 false, SourceLocation(),
1799 SS, Name,
1800 /* AttrList */ 0,
1801 /* IsTypeName */ false,
1802 SourceLocation());
1803 return;
1804 }
1805 }
1806
1807 // static_assert-declaration
1808 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1809 // FIXME: Check for templates
1810 SourceLocation DeclEnd;
1811 ParseStaticAssertDeclaration(DeclEnd);
1812 return;
1813 }
1814
1815 if (Tok.is(tok::kw_template)) {
1816 assert(!TemplateInfo.TemplateParams &&
1817 "Nested template improperly parsed?");
1818 SourceLocation DeclEnd;
1819 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1820 AS, AccessAttrs);
1821 return;
1822 }
1823
1824 // Handle: member-declaration ::= '__extension__' member-declaration
1825 if (Tok.is(tok::kw___extension__)) {
1826 // __extension__ silences extension warnings in the subexpression.
1827 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1828 ConsumeToken();
1829 return ParseCXXClassMemberDeclaration(AS, AccessAttrs,
1830 TemplateInfo, TemplateDiags);
1831 }
1832
1833 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1834 // is a bitfield.
1835 ColonProtectionRAIIObject X(*this);
1836
1837 ParsedAttributesWithRange attrs(AttrFactory);
1838 // Optional C++0x attribute-specifier
1839 MaybeParseCXX0XAttributes(attrs);
1840 MaybeParseMicrosoftAttributes(attrs);
1841
1842 if (Tok.is(tok::kw_using)) {
1843 ProhibitAttributes(attrs);
1844
1845 // Eat 'using'.
1846 SourceLocation UsingLoc = ConsumeToken();
1847
1848 if (Tok.is(tok::kw_namespace)) {
1849 Diag(UsingLoc, diag::err_using_namespace_in_class);
1850 SkipUntil(tok::semi, true, true);
1851 } else {
1852 SourceLocation DeclEnd;
1853 // Otherwise, it must be a using-declaration or an alias-declaration.
1854 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
1855 UsingLoc, DeclEnd, AS);
1856 }
1857 return;
1858 }
1859
1860 // Hold late-parsed attributes so we can attach a Decl to them later.
1861 LateParsedAttrList CommonLateParsedAttrs;
1862
1863 // decl-specifier-seq:
1864 // Parse the common declaration-specifiers piece.
1865 ParsingDeclSpec DS(*this, TemplateDiags);
1866 DS.takeAttributesFrom(attrs);
1867 if (MalformedTypeSpec)
1868 DS.SetTypeSpecError();
1869 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class,
1870 &CommonLateParsedAttrs);
1871
1872 MultiTemplateParamsArg TemplateParams(
1873 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1874 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1875
1876 if (Tok.is(tok::semi)) {
1877 ConsumeToken();
1878 Decl *TheDecl =
1879 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
1880 DS.complete(TheDecl);
1881 return;
1882 }
1883
1884 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1885 VirtSpecifiers VS;
1886
1887 // Hold late-parsed attributes so we can attach a Decl to them later.
1888 LateParsedAttrList LateParsedAttrs;
1889
1890 SourceLocation EqualLoc;
1891 bool HasInitializer = false;
1892 ExprResult Init;
1893 if (Tok.isNot(tok::colon)) {
1894 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1895 ColonProtectionRAIIObject X(*this);
1896
1897 // Parse the first declarator.
1898 ParseDeclarator(DeclaratorInfo);
1899 // Error parsing the declarator?
1900 if (!DeclaratorInfo.hasName()) {
1901 // If so, skip until the semi-colon or a }.
1902 SkipUntil(tok::r_brace, true, true);
1903 if (Tok.is(tok::semi))
1904 ConsumeToken();
1905 return;
1906 }
1907
1908 ParseOptionalCXX0XVirtSpecifierSeq(VS);
1909
1910 // If attributes exist after the declarator, but before an '{', parse them.
1911 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
1912
1913 // MSVC permits pure specifier on inline functions declared at class scope.
1914 // Hence check for =0 before checking for function definition.
1915 if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) &&
1916 DeclaratorInfo.isFunctionDeclarator() &&
1917 NextToken().is(tok::numeric_constant)) {
1918 EqualLoc = ConsumeToken();
1919 Init = ParseInitializer();
1920 if (Init.isInvalid())
1921 SkipUntil(tok::comma, true, true);
1922 else
1923 HasInitializer = true;
1924 }
1925
1926 FunctionDefinitionKind DefinitionKind = FDK_Declaration;
1927 // function-definition:
1928 //
1929 // In C++11, a non-function declarator followed by an open brace is a
1930 // braced-init-list for an in-class member initialization, not an
1931 // erroneous function definition.
1932 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus0x) {
1933 DefinitionKind = FDK_Definition;
1934 } else if (DeclaratorInfo.isFunctionDeclarator()) {
1935 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
1936 DefinitionKind = FDK_Definition;
1937 } else if (Tok.is(tok::equal)) {
1938 const Token &KW = NextToken();
1939 if (KW.is(tok::kw_default))
1940 DefinitionKind = FDK_Defaulted;
1941 else if (KW.is(tok::kw_delete))
1942 DefinitionKind = FDK_Deleted;
1943 }
1944 }
1945
1946 if (DefinitionKind) {
1947 if (!DeclaratorInfo.isFunctionDeclarator()) {
1948 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params);
1949 ConsumeBrace();
1950 SkipUntil(tok::r_brace, /*StopAtSemi*/false);
1951
1952 // Consume the optional ';'
1953 if (Tok.is(tok::semi))
1954 ConsumeToken();
1955 return;
1956 }
1957
1958 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1959 Diag(DeclaratorInfo.getIdentifierLoc(),
1960 diag::err_function_declared_typedef);
1961 // This recovery skips the entire function body. It would be nice
1962 // to simply call ParseCXXInlineMethodDef() below, however Sema
1963 // assumes the declarator represents a function, not a typedef.
1964 ConsumeBrace();
1965 SkipUntil(tok::r_brace, /*StopAtSemi*/false);
1966
1967 // Consume the optional ';'
1968 if (Tok.is(tok::semi))
1969 ConsumeToken();
1970 return;
1971 }
1972
1973 Decl *FunDecl =
1974 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo,
1975 VS, DefinitionKind, Init);
1976
1977 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
1978 CommonLateParsedAttrs[i]->addDecl(FunDecl);
1979 }
1980 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
1981 LateParsedAttrs[i]->addDecl(FunDecl);
1982 }
1983 LateParsedAttrs.clear();
1984
1985 // Consume the ';' - it's optional unless we have a delete or default
1986 if (Tok.is(tok::semi))
1987 ConsumeExtraSemi(AfterMemberFunctionDefinition);
1988
1989 return;
1990 }
1991 }
1992
1993 // member-declarator-list:
1994 // member-declarator
1995 // member-declarator-list ',' member-declarator
1996
1997 SmallVector<Decl *, 8> DeclsInGroup;
1998 ExprResult BitfieldSize;
1999 bool ExpectSemi = true;
2000
2001 while (1) {
2002 // member-declarator:
2003 // declarator pure-specifier[opt]
2004 // declarator brace-or-equal-initializer[opt]
2005 // identifier[opt] ':' constant-expression
2006 if (Tok.is(tok::colon)) {
2007 ConsumeToken();
2008 BitfieldSize = ParseConstantExpression();
2009 if (BitfieldSize.isInvalid())
2010 SkipUntil(tok::comma, true, true);
2011 }
2012
2013 // If a simple-asm-expr is present, parse it.
2014 if (Tok.is(tok::kw_asm)) {
2015 SourceLocation Loc;
2016 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
2017 if (AsmLabel.isInvalid())
2018 SkipUntil(tok::comma, true, true);
2019
2020 DeclaratorInfo.setAsmLabel(AsmLabel.release());
2021 DeclaratorInfo.SetRangeEnd(Loc);
2022 }
2023
2024 // If attributes exist after the declarator, parse them.
2025 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
2026
2027 // FIXME: When g++ adds support for this, we'll need to check whether it
2028 // goes before or after the GNU attributes and __asm__.
2029 ParseOptionalCXX0XVirtSpecifierSeq(VS);
2030
2031 InClassInitStyle HasInClassInit = ICIS_NoInit;
2032 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) {
2033 if (BitfieldSize.get()) {
2034 Diag(Tok, diag::err_bitfield_member_init);
2035 SkipUntil(tok::comma, true, true);
2036 } else {
2037 HasInitializer = true;
2038 if (!DeclaratorInfo.isDeclarationOfFunction() &&
2039 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
2040 != DeclSpec::SCS_static &&
2041 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
2042 != DeclSpec::SCS_typedef)
2043 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit;
2044 }
2045 }
2046
2047 // NOTE: If Sema is the Action module and declarator is an instance field,
2048 // this call will *not* return the created decl; It will return null.
2049 // See Sema::ActOnCXXMemberDeclarator for details.
2050
2051 Decl *ThisDecl = 0;
2052 if (DS.isFriendSpecified()) {
2053 // TODO: handle initializers, bitfields, 'delete'
2054 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
2055 TemplateParams);
2056 } else {
2057 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
2058 DeclaratorInfo,
2059 TemplateParams,
2060 BitfieldSize.release(),
2061 VS, HasInClassInit);
2062 if (AccessAttrs)
2063 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs,
2064 false, true);
2065 }
2066
2067 // Set the Decl for any late parsed attributes
2068 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) {
2069 CommonLateParsedAttrs[i]->addDecl(ThisDecl);
2070 }
2071 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) {
2072 LateParsedAttrs[i]->addDecl(ThisDecl);
2073 }
2074 LateParsedAttrs.clear();
2075
2076 // Handle the initializer.
2077 if (HasInClassInit != ICIS_NoInit) {
2078 // The initializer was deferred; parse it and cache the tokens.
2079 Diag(Tok, getLangOpts().CPlusPlus0x ?
2080 diag::warn_cxx98_compat_nonstatic_member_init :
2081 diag::ext_nonstatic_member_init);
2082
2083 if (DeclaratorInfo.isArrayOfUnknownBound()) {
2084 // C++11 [dcl.array]p3: An array bound may also be omitted when the
2085 // declarator is followed by an initializer.
2086 //
2087 // A brace-or-equal-initializer for a member-declarator is not an
2088 // initializer in the grammar, so this is ill-formed.
2089 Diag(Tok, diag::err_incomplete_array_member_init);
2090 SkipUntil(tok::comma, true, true);
2091 if (ThisDecl)
2092 // Avoid later warnings about a class member of incomplete type.
2093 ThisDecl->setInvalidDecl();
2094 } else
2095 ParseCXXNonStaticMemberInitializer(ThisDecl);
2096 } else if (HasInitializer) {
2097 // Normal initializer.
2098 if (!Init.isUsable())
2099 Init = ParseCXXMemberInitializer(ThisDecl,
2100 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
2101
2102 if (Init.isInvalid())
2103 SkipUntil(tok::comma, true, true);
2104 else if (ThisDecl)
2105 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(),
2106 DS.getTypeSpecType() == DeclSpec::TST_auto);
2107 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) {
2108 // No initializer.
2109 Actions.ActOnUninitializedDecl(ThisDecl,
2110 DS.getTypeSpecType() == DeclSpec::TST_auto);
2111 }
2112
2113 if (ThisDecl) {
2114 Actions.FinalizeDeclaration(ThisDecl);
2115 DeclsInGroup.push_back(ThisDecl);
2116 }
2117
2118 if (ThisDecl && DeclaratorInfo.isFunctionDeclarator() &&
2119 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
2120 != DeclSpec::SCS_typedef) {
2121 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl);
2122 }
2123
2124 DeclaratorInfo.complete(ThisDecl);
2125
2126 // If we don't have a comma, it is either the end of the list (a ';')
2127 // or an error, bail out.
2128 if (Tok.isNot(tok::comma))
2129 break;
2130
2131 // Consume the comma.
2132 SourceLocation CommaLoc = ConsumeToken();
2133
2134 if (Tok.isAtStartOfLine() &&
2135 !MightBeDeclarator(Declarator::MemberContext)) {
2136 // This comma was followed by a line-break and something which can't be
2137 // the start of a declarator. The comma was probably a typo for a
2138 // semicolon.
2139 Diag(CommaLoc, diag::err_expected_semi_declaration)
2140 << FixItHint::CreateReplacement(CommaLoc, ";");
2141 ExpectSemi = false;
2142 break;
2143 }
2144
2145 // Parse the next declarator.
2146 DeclaratorInfo.clear();
2147 VS.clear();
2148 BitfieldSize = true;
2149 Init = true;
2150 HasInitializer = false;
2151 DeclaratorInfo.setCommaLoc(CommaLoc);
2152
2153 // Attributes are only allowed on the second declarator.
2154 MaybeParseGNUAttributes(DeclaratorInfo);
2155
2156 if (Tok.isNot(tok::colon))
2157 ParseDeclarator(DeclaratorInfo);
2158 }
2159
2160 if (ExpectSemi &&
2161 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
2162 // Skip to end of block or statement.
2163 SkipUntil(tok::r_brace, true, true);
2164 // If we stopped at a ';', eat it.
2165 if (Tok.is(tok::semi)) ConsumeToken();
2166 return;
2167 }
2168
2169 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
2170 DeclsInGroup.size());
2171 }
2172
2173 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or
2174 /// pure-specifier. Also detect and reject any attempted defaulted/deleted
2175 /// function definition. The location of the '=', if any, will be placed in
2176 /// EqualLoc.
2177 ///
2178 /// pure-specifier:
2179 /// '= 0'
2180 ///
2181 /// brace-or-equal-initializer:
2182 /// '=' initializer-expression
2183 /// braced-init-list
2184 ///
2185 /// initializer-clause:
2186 /// assignment-expression
2187 /// braced-init-list
2188 ///
2189 /// defaulted/deleted function-definition:
2190 /// '=' 'default'
2191 /// '=' 'delete'
2192 ///
2193 /// Prior to C++0x, the assignment-expression in an initializer-clause must
2194 /// be a constant-expression.
ParseCXXMemberInitializer(Decl * D,bool IsFunction,SourceLocation & EqualLoc)2195 ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction,
2196 SourceLocation &EqualLoc) {
2197 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace))
2198 && "Data member initializer not starting with '=' or '{'");
2199
2200 EnterExpressionEvaluationContext Context(Actions,
2201 Sema::PotentiallyEvaluated,
2202 D);
2203 if (Tok.is(tok::equal)) {
2204 EqualLoc = ConsumeToken();
2205 if (Tok.is(tok::kw_delete)) {
2206 // In principle, an initializer of '= delete p;' is legal, but it will
2207 // never type-check. It's better to diagnose it as an ill-formed expression
2208 // than as an ill-formed deleted non-function member.
2209 // An initializer of '= delete p, foo' will never be parsed, because
2210 // a top-level comma always ends the initializer expression.
2211 const Token &Next = NextToken();
2212 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) ||
2213 Next.is(tok::eof)) {
2214 if (IsFunction)
2215 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2216 << 1 /* delete */;
2217 else
2218 Diag(ConsumeToken(), diag::err_deleted_non_function);
2219 return ExprResult();
2220 }
2221 } else if (Tok.is(tok::kw_default)) {
2222 if (IsFunction)
2223 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
2224 << 0 /* default */;
2225 else
2226 Diag(ConsumeToken(), diag::err_default_special_members);
2227 return ExprResult();
2228 }
2229
2230 }
2231 return ParseInitializer();
2232 }
2233
2234 /// ParseCXXMemberSpecification - Parse the class definition.
2235 ///
2236 /// member-specification:
2237 /// member-declaration member-specification[opt]
2238 /// access-specifier ':' member-specification[opt]
2239 ///
ParseCXXMemberSpecification(SourceLocation RecordLoc,unsigned TagType,Decl * TagDecl)2240 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
2241 unsigned TagType, Decl *TagDecl) {
2242 assert((TagType == DeclSpec::TST_struct ||
2243 TagType == DeclSpec::TST_interface ||
2244 TagType == DeclSpec::TST_union ||
2245 TagType == DeclSpec::TST_class) && "Invalid TagType!");
2246
2247 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2248 "parsing struct/union/class body");
2249
2250 // Determine whether this is a non-nested class. Note that local
2251 // classes are *not* considered to be nested classes.
2252 bool NonNestedClass = true;
2253 if (!ClassStack.empty()) {
2254 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2255 if (S->isClassScope()) {
2256 // We're inside a class scope, so this is a nested class.
2257 NonNestedClass = false;
2258 break;
2259 }
2260
2261 if ((S->getFlags() & Scope::FnScope)) {
2262 // If we're in a function or function template declared in the
2263 // body of a class, then this is a local class rather than a
2264 // nested class.
2265 const Scope *Parent = S->getParent();
2266 if (Parent->isTemplateParamScope())
2267 Parent = Parent->getParent();
2268 if (Parent->isClassScope())
2269 break;
2270 }
2271 }
2272 }
2273
2274 // Enter a scope for the class.
2275 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2276
2277 // Note that we are parsing a new (potentially-nested) class definition.
2278 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
2279
2280 if (TagDecl)
2281 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2282
2283 SourceLocation FinalLoc;
2284
2285 // Parse the optional 'final' keyword.
2286 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) {
2287 assert(isCXX0XFinalKeyword() && "not a class definition");
2288 FinalLoc = ConsumeToken();
2289
2290 Diag(FinalLoc, getLangOpts().CPlusPlus0x ?
2291 diag::warn_cxx98_compat_override_control_keyword :
2292 diag::ext_override_control_keyword) << "final";
2293 }
2294
2295 if (Tok.is(tok::colon)) {
2296 ParseBaseClause(TagDecl);
2297
2298 if (!Tok.is(tok::l_brace)) {
2299 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
2300
2301 if (TagDecl)
2302 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
2303 return;
2304 }
2305 }
2306
2307 assert(Tok.is(tok::l_brace));
2308 BalancedDelimiterTracker T(*this, tok::l_brace);
2309 T.consumeOpen();
2310
2311 if (TagDecl)
2312 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
2313 T.getOpenLocation());
2314
2315 // C++ 11p3: Members of a class defined with the keyword class are private
2316 // by default. Members of a class defined with the keywords struct or union
2317 // are public by default.
2318 AccessSpecifier CurAS;
2319 if (TagType == DeclSpec::TST_class)
2320 CurAS = AS_private;
2321 else
2322 CurAS = AS_public;
2323 ParsedAttributes AccessAttrs(AttrFactory);
2324
2325 if (TagDecl) {
2326 // While we still have something to read, read the member-declarations.
2327 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
2328 // Each iteration of this loop reads one member-declaration.
2329
2330 if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) ||
2331 Tok.is(tok::kw___if_not_exists))) {
2332 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2333 continue;
2334 }
2335
2336 // Check for extraneous top-level semicolon.
2337 if (Tok.is(tok::semi)) {
2338 ConsumeExtraSemi(InsideStruct, TagType);
2339 continue;
2340 }
2341
2342 if (Tok.is(tok::annot_pragma_vis)) {
2343 HandlePragmaVisibility();
2344 continue;
2345 }
2346
2347 if (Tok.is(tok::annot_pragma_pack)) {
2348 HandlePragmaPack();
2349 continue;
2350 }
2351
2352 AccessSpecifier AS = getAccessSpecifierIfPresent();
2353 if (AS != AS_none) {
2354 // Current token is a C++ access specifier.
2355 CurAS = AS;
2356 SourceLocation ASLoc = Tok.getLocation();
2357 unsigned TokLength = Tok.getLength();
2358 ConsumeToken();
2359 AccessAttrs.clear();
2360 MaybeParseGNUAttributes(AccessAttrs);
2361
2362 SourceLocation EndLoc;
2363 if (Tok.is(tok::colon)) {
2364 EndLoc = Tok.getLocation();
2365 ConsumeToken();
2366 } else if (Tok.is(tok::semi)) {
2367 EndLoc = Tok.getLocation();
2368 ConsumeToken();
2369 Diag(EndLoc, diag::err_expected_colon)
2370 << FixItHint::CreateReplacement(EndLoc, ":");
2371 } else {
2372 EndLoc = ASLoc.getLocWithOffset(TokLength);
2373 Diag(EndLoc, diag::err_expected_colon)
2374 << FixItHint::CreateInsertion(EndLoc, ":");
2375 }
2376
2377 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc,
2378 AccessAttrs.getList())) {
2379 // found another attribute than only annotations
2380 AccessAttrs.clear();
2381 }
2382
2383 continue;
2384 }
2385
2386 // FIXME: Make sure we don't have a template here.
2387
2388 // Parse all the comma separated declarators.
2389 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList());
2390 }
2391
2392 T.consumeClose();
2393 } else {
2394 SkipUntil(tok::r_brace, false, false);
2395 }
2396
2397 // If attributes exist after class contents, parse them.
2398 ParsedAttributes attrs(AttrFactory);
2399 MaybeParseGNUAttributes(attrs);
2400
2401 if (TagDecl)
2402 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
2403 T.getOpenLocation(),
2404 T.getCloseLocation(),
2405 attrs.getList());
2406
2407 // C++11 [class.mem]p2:
2408 // Within the class member-specification, the class is regarded as complete
2409 // within function bodies, default arguments, and
2410 // brace-or-equal-initializers for non-static data members (including such
2411 // things in nested classes).
2412 if (TagDecl && NonNestedClass) {
2413 // We are not inside a nested class. This class and its nested classes
2414 // are complete and we can parse the delayed portions of method
2415 // declarations and the lexed inline method definitions, along with any
2416 // delayed attributes.
2417 SourceLocation SavedPrevTokLocation = PrevTokLocation;
2418 ParseLexedAttributes(getCurrentClass());
2419 ParseLexedMethodDeclarations(getCurrentClass());
2420
2421 // We've finished with all pending member declarations.
2422 Actions.ActOnFinishCXXMemberDecls();
2423
2424 ParseLexedMemberInitializers(getCurrentClass());
2425 ParseLexedMethodDefs(getCurrentClass());
2426 PrevTokLocation = SavedPrevTokLocation;
2427 }
2428
2429 if (TagDecl)
2430 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl,
2431 T.getCloseLocation());
2432
2433 // Leave the class scope.
2434 ParsingDef.Pop();
2435 ClassScope.Exit();
2436 }
2437
2438 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
2439 /// which explicitly initializes the members or base classes of a
2440 /// class (C++ [class.base.init]). For example, the three initializers
2441 /// after the ':' in the Derived constructor below:
2442 ///
2443 /// @code
2444 /// class Base { };
2445 /// class Derived : Base {
2446 /// int x;
2447 /// float f;
2448 /// public:
2449 /// Derived(float f) : Base(), x(17), f(f) { }
2450 /// };
2451 /// @endcode
2452 ///
2453 /// [C++] ctor-initializer:
2454 /// ':' mem-initializer-list
2455 ///
2456 /// [C++] mem-initializer-list:
2457 /// mem-initializer ...[opt]
2458 /// mem-initializer ...[opt] , mem-initializer-list
ParseConstructorInitializer(Decl * ConstructorDecl)2459 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
2460 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
2461
2462 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
2463 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
2464 SourceLocation ColonLoc = ConsumeToken();
2465
2466 SmallVector<CXXCtorInitializer*, 4> MemInitializers;
2467 bool AnyErrors = false;
2468
2469 do {
2470 if (Tok.is(tok::code_completion)) {
2471 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
2472 MemInitializers.data(),
2473 MemInitializers.size());
2474 return cutOffParsing();
2475 } else {
2476 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
2477 if (!MemInit.isInvalid())
2478 MemInitializers.push_back(MemInit.get());
2479 else
2480 AnyErrors = true;
2481 }
2482
2483 if (Tok.is(tok::comma))
2484 ConsumeToken();
2485 else if (Tok.is(tok::l_brace))
2486 break;
2487 // If the next token looks like a base or member initializer, assume that
2488 // we're just missing a comma.
2489 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
2490 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
2491 Diag(Loc, diag::err_ctor_init_missing_comma)
2492 << FixItHint::CreateInsertion(Loc, ", ");
2493 } else {
2494 // Skip over garbage, until we get to '{'. Don't eat the '{'.
2495 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
2496 SkipUntil(tok::l_brace, true, true);
2497 break;
2498 }
2499 } while (true);
2500
2501 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
2502 MemInitializers.data(), MemInitializers.size(),
2503 AnyErrors);
2504 }
2505
2506 /// ParseMemInitializer - Parse a C++ member initializer, which is
2507 /// part of a constructor initializer that explicitly initializes one
2508 /// member or base class (C++ [class.base.init]). See
2509 /// ParseConstructorInitializer for an example.
2510 ///
2511 /// [C++] mem-initializer:
2512 /// mem-initializer-id '(' expression-list[opt] ')'
2513 /// [C++0x] mem-initializer-id braced-init-list
2514 ///
2515 /// [C++] mem-initializer-id:
2516 /// '::'[opt] nested-name-specifier[opt] class-name
2517 /// identifier
ParseMemInitializer(Decl * ConstructorDecl)2518 Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
2519 // parse '::'[opt] nested-name-specifier[opt]
2520 CXXScopeSpec SS;
2521 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
2522 ParsedType TemplateTypeTy;
2523 if (Tok.is(tok::annot_template_id)) {
2524 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2525 if (TemplateId->Kind == TNK_Type_template ||
2526 TemplateId->Kind == TNK_Dependent_template_name) {
2527 AnnotateTemplateIdTokenAsType();
2528 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2529 TemplateTypeTy = getTypeAnnotation(Tok);
2530 }
2531 }
2532 // Uses of decltype will already have been converted to annot_decltype by
2533 // ParseOptionalCXXScopeSpecifier at this point.
2534 if (!TemplateTypeTy && Tok.isNot(tok::identifier)
2535 && Tok.isNot(tok::annot_decltype)) {
2536 Diag(Tok, diag::err_expected_member_or_base_name);
2537 return true;
2538 }
2539
2540 IdentifierInfo *II = 0;
2541 DeclSpec DS(AttrFactory);
2542 SourceLocation IdLoc = Tok.getLocation();
2543 if (Tok.is(tok::annot_decltype)) {
2544 // Get the decltype expression, if there is one.
2545 ParseDecltypeSpecifier(DS);
2546 } else {
2547 if (Tok.is(tok::identifier))
2548 // Get the identifier. This may be a member name or a class name,
2549 // but we'll let the semantic analysis determine which it is.
2550 II = Tok.getIdentifierInfo();
2551 ConsumeToken();
2552 }
2553
2554
2555 // Parse the '('.
2556 if (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace)) {
2557 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2558
2559 ExprResult InitList = ParseBraceInitializer();
2560 if (InitList.isInvalid())
2561 return true;
2562
2563 SourceLocation EllipsisLoc;
2564 if (Tok.is(tok::ellipsis))
2565 EllipsisLoc = ConsumeToken();
2566
2567 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2568 TemplateTypeTy, DS, IdLoc,
2569 InitList.take(), EllipsisLoc);
2570 } else if(Tok.is(tok::l_paren)) {
2571 BalancedDelimiterTracker T(*this, tok::l_paren);
2572 T.consumeOpen();
2573
2574 // Parse the optional expression-list.
2575 ExprVector ArgExprs;
2576 CommaLocsTy CommaLocs;
2577 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2578 SkipUntil(tok::r_paren);
2579 return true;
2580 }
2581
2582 T.consumeClose();
2583
2584 SourceLocation EllipsisLoc;
2585 if (Tok.is(tok::ellipsis))
2586 EllipsisLoc = ConsumeToken();
2587
2588 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2589 TemplateTypeTy, DS, IdLoc,
2590 T.getOpenLocation(), ArgExprs.data(),
2591 ArgExprs.size(), T.getCloseLocation(),
2592 EllipsisLoc);
2593 }
2594
2595 Diag(Tok, getLangOpts().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace
2596 : diag::err_expected_lparen);
2597 return true;
2598 }
2599
2600 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2601 ///
2602 /// exception-specification:
2603 /// dynamic-exception-specification
2604 /// noexcept-specification
2605 ///
2606 /// noexcept-specification:
2607 /// 'noexcept'
2608 /// 'noexcept' '(' constant-expression ')'
2609 ExceptionSpecificationType
tryParseExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & DynamicExceptions,SmallVectorImpl<SourceRange> & DynamicExceptionRanges,ExprResult & NoexceptExpr)2610 Parser::tryParseExceptionSpecification(
2611 SourceRange &SpecificationRange,
2612 SmallVectorImpl<ParsedType> &DynamicExceptions,
2613 SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2614 ExprResult &NoexceptExpr) {
2615 ExceptionSpecificationType Result = EST_None;
2616
2617 // See if there's a dynamic specification.
2618 if (Tok.is(tok::kw_throw)) {
2619 Result = ParseDynamicExceptionSpecification(SpecificationRange,
2620 DynamicExceptions,
2621 DynamicExceptionRanges);
2622 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2623 "Produced different number of exception types and ranges.");
2624 }
2625
2626 // If there's no noexcept specification, we're done.
2627 if (Tok.isNot(tok::kw_noexcept))
2628 return Result;
2629
2630 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl);
2631
2632 // If we already had a dynamic specification, parse the noexcept for,
2633 // recovery, but emit a diagnostic and don't store the results.
2634 SourceRange NoexceptRange;
2635 ExceptionSpecificationType NoexceptType = EST_None;
2636
2637 SourceLocation KeywordLoc = ConsumeToken();
2638 if (Tok.is(tok::l_paren)) {
2639 // There is an argument.
2640 BalancedDelimiterTracker T(*this, tok::l_paren);
2641 T.consumeOpen();
2642 NoexceptType = EST_ComputedNoexcept;
2643 NoexceptExpr = ParseConstantExpression();
2644 // The argument must be contextually convertible to bool. We use
2645 // ActOnBooleanCondition for this purpose.
2646 if (!NoexceptExpr.isInvalid())
2647 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2648 NoexceptExpr.get());
2649 T.consumeClose();
2650 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation());
2651 } else {
2652 // There is no argument.
2653 NoexceptType = EST_BasicNoexcept;
2654 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2655 }
2656
2657 if (Result == EST_None) {
2658 SpecificationRange = NoexceptRange;
2659 Result = NoexceptType;
2660
2661 // If there's a dynamic specification after a noexcept specification,
2662 // parse that and ignore the results.
2663 if (Tok.is(tok::kw_throw)) {
2664 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2665 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2666 DynamicExceptionRanges);
2667 }
2668 } else {
2669 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2670 }
2671
2672 return Result;
2673 }
2674
2675 /// ParseDynamicExceptionSpecification - Parse a C++
2676 /// dynamic-exception-specification (C++ [except.spec]).
2677 ///
2678 /// dynamic-exception-specification:
2679 /// 'throw' '(' type-id-list [opt] ')'
2680 /// [MS] 'throw' '(' '...' ')'
2681 ///
2682 /// type-id-list:
2683 /// type-id ... [opt]
2684 /// type-id-list ',' type-id ... [opt]
2685 ///
ParseDynamicExceptionSpecification(SourceRange & SpecificationRange,SmallVectorImpl<ParsedType> & Exceptions,SmallVectorImpl<SourceRange> & Ranges)2686 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2687 SourceRange &SpecificationRange,
2688 SmallVectorImpl<ParsedType> &Exceptions,
2689 SmallVectorImpl<SourceRange> &Ranges) {
2690 assert(Tok.is(tok::kw_throw) && "expected throw");
2691
2692 SpecificationRange.setBegin(ConsumeToken());
2693 BalancedDelimiterTracker T(*this, tok::l_paren);
2694 if (T.consumeOpen()) {
2695 Diag(Tok, diag::err_expected_lparen_after) << "throw";
2696 SpecificationRange.setEnd(SpecificationRange.getBegin());
2697 return EST_DynamicNone;
2698 }
2699
2700 // Parse throw(...), a Microsoft extension that means "this function
2701 // can throw anything".
2702 if (Tok.is(tok::ellipsis)) {
2703 SourceLocation EllipsisLoc = ConsumeToken();
2704 if (!getLangOpts().MicrosoftExt)
2705 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2706 T.consumeClose();
2707 SpecificationRange.setEnd(T.getCloseLocation());
2708 return EST_MSAny;
2709 }
2710
2711 // Parse the sequence of type-ids.
2712 SourceRange Range;
2713 while (Tok.isNot(tok::r_paren)) {
2714 TypeResult Res(ParseTypeName(&Range));
2715
2716 if (Tok.is(tok::ellipsis)) {
2717 // C++0x [temp.variadic]p5:
2718 // - In a dynamic-exception-specification (15.4); the pattern is a
2719 // type-id.
2720 SourceLocation Ellipsis = ConsumeToken();
2721 Range.setEnd(Ellipsis);
2722 if (!Res.isInvalid())
2723 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2724 }
2725
2726 if (!Res.isInvalid()) {
2727 Exceptions.push_back(Res.get());
2728 Ranges.push_back(Range);
2729 }
2730
2731 if (Tok.is(tok::comma))
2732 ConsumeToken();
2733 else
2734 break;
2735 }
2736
2737 T.consumeClose();
2738 SpecificationRange.setEnd(T.getCloseLocation());
2739 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
2740 }
2741
2742 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
2743 /// function declaration.
ParseTrailingReturnType(SourceRange & Range)2744 TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) {
2745 assert(Tok.is(tok::arrow) && "expected arrow");
2746
2747 ConsumeToken();
2748
2749 return ParseTypeName(&Range, Declarator::TrailingReturnContext);
2750 }
2751
2752 /// \brief We have just started parsing the definition of a new class,
2753 /// so push that class onto our stack of classes that is currently
2754 /// being parsed.
2755 Sema::ParsingClassState
PushParsingClass(Decl * ClassDecl,bool NonNestedClass)2756 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
2757 assert((NonNestedClass || !ClassStack.empty()) &&
2758 "Nested class without outer class");
2759 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
2760 return Actions.PushParsingClass();
2761 }
2762
2763 /// \brief Deallocate the given parsed class and all of its nested
2764 /// classes.
DeallocateParsedClasses(Parser::ParsingClass * Class)2765 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
2766 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
2767 delete Class->LateParsedDeclarations[I];
2768 delete Class;
2769 }
2770
2771 /// \brief Pop the top class of the stack of classes that are
2772 /// currently being parsed.
2773 ///
2774 /// This routine should be called when we have finished parsing the
2775 /// definition of a class, but have not yet popped the Scope
2776 /// associated with the class's definition.
PopParsingClass(Sema::ParsingClassState state)2777 void Parser::PopParsingClass(Sema::ParsingClassState state) {
2778 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
2779
2780 Actions.PopParsingClass(state);
2781
2782 ParsingClass *Victim = ClassStack.top();
2783 ClassStack.pop();
2784 if (Victim->TopLevelClass) {
2785 // Deallocate all of the nested classes of this class,
2786 // recursively: we don't need to keep any of this information.
2787 DeallocateParsedClasses(Victim);
2788 return;
2789 }
2790 assert(!ClassStack.empty() && "Missing top-level class?");
2791
2792 if (Victim->LateParsedDeclarations.empty()) {
2793 // The victim is a nested class, but we will not need to perform
2794 // any processing after the definition of this class since it has
2795 // no members whose handling was delayed. Therefore, we can just
2796 // remove this nested class.
2797 DeallocateParsedClasses(Victim);
2798 return;
2799 }
2800
2801 // This nested class has some members that will need to be processed
2802 // after the top-level class is completely defined. Therefore, add
2803 // it to the list of nested classes within its parent.
2804 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
2805 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
2806 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
2807 }
2808
2809 /// \brief Try to parse an 'identifier' which appears within an attribute-token.
2810 ///
2811 /// \return the parsed identifier on success, and 0 if the next token is not an
2812 /// attribute-token.
2813 ///
2814 /// C++11 [dcl.attr.grammar]p3:
2815 /// If a keyword or an alternative token that satisfies the syntactic
2816 /// requirements of an identifier is contained in an attribute-token,
2817 /// it is considered an identifier.
TryParseCXX11AttributeIdentifier(SourceLocation & Loc)2818 IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) {
2819 switch (Tok.getKind()) {
2820 default:
2821 // Identifiers and keywords have identifier info attached.
2822 if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
2823 Loc = ConsumeToken();
2824 return II;
2825 }
2826 return 0;
2827
2828 case tok::ampamp: // 'and'
2829 case tok::pipe: // 'bitor'
2830 case tok::pipepipe: // 'or'
2831 case tok::caret: // 'xor'
2832 case tok::tilde: // 'compl'
2833 case tok::amp: // 'bitand'
2834 case tok::ampequal: // 'and_eq'
2835 case tok::pipeequal: // 'or_eq'
2836 case tok::caretequal: // 'xor_eq'
2837 case tok::exclaim: // 'not'
2838 case tok::exclaimequal: // 'not_eq'
2839 // Alternative tokens do not have identifier info, but their spelling
2840 // starts with an alphabetical character.
2841 llvm::SmallString<8> SpellingBuf;
2842 StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf);
2843 if (std::isalpha(Spelling[0])) {
2844 Loc = ConsumeToken();
2845 return &PP.getIdentifierTable().get(Spelling);
2846 }
2847 return 0;
2848 }
2849 }
2850
2851 /// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently
2852 /// only parses standard attributes.
2853 ///
2854 /// [C++11] attribute-specifier:
2855 /// '[' '[' attribute-list ']' ']'
2856 /// alignment-specifier
2857 ///
2858 /// [C++11] attribute-list:
2859 /// attribute[opt]
2860 /// attribute-list ',' attribute[opt]
2861 /// attribute '...'
2862 /// attribute-list ',' attribute '...'
2863 ///
2864 /// [C++11] attribute:
2865 /// attribute-token attribute-argument-clause[opt]
2866 ///
2867 /// [C++11] attribute-token:
2868 /// identifier
2869 /// attribute-scoped-token
2870 ///
2871 /// [C++11] attribute-scoped-token:
2872 /// attribute-namespace '::' identifier
2873 ///
2874 /// [C++11] attribute-namespace:
2875 /// identifier
2876 ///
2877 /// [C++11] attribute-argument-clause:
2878 /// '(' balanced-token-seq ')'
2879 ///
2880 /// [C++11] balanced-token-seq:
2881 /// balanced-token
2882 /// balanced-token-seq balanced-token
2883 ///
2884 /// [C++11] balanced-token:
2885 /// '(' balanced-token-seq ')'
2886 /// '[' balanced-token-seq ']'
2887 /// '{' balanced-token-seq '}'
2888 /// any token but '(', ')', '[', ']', '{', or '}'
ParseCXX11AttributeSpecifier(ParsedAttributes & attrs,SourceLocation * endLoc)2889 void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs,
2890 SourceLocation *endLoc) {
2891 if (Tok.is(tok::kw_alignas)) {
2892 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas);
2893 ParseAlignmentSpecifier(attrs, endLoc);
2894 return;
2895 }
2896
2897 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
2898 && "Not a C++11 attribute list");
2899
2900 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute);
2901
2902 ConsumeBracket();
2903 ConsumeBracket();
2904
2905 while (Tok.isNot(tok::r_square)) {
2906 // attribute not present
2907 if (Tok.is(tok::comma)) {
2908 ConsumeToken();
2909 continue;
2910 }
2911
2912 SourceLocation ScopeLoc, AttrLoc;
2913 IdentifierInfo *ScopeName = 0, *AttrName = 0;
2914
2915 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
2916 if (!AttrName)
2917 // Break out to the "expected ']'" diagnostic.
2918 break;
2919
2920 // scoped attribute
2921 if (Tok.is(tok::coloncolon)) {
2922 ConsumeToken();
2923
2924 ScopeName = AttrName;
2925 ScopeLoc = AttrLoc;
2926
2927 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc);
2928 if (!AttrName) {
2929 Diag(Tok.getLocation(), diag::err_expected_ident);
2930 SkipUntil(tok::r_square, tok::comma, true, true);
2931 continue;
2932 }
2933 }
2934
2935 bool AttrParsed = false;
2936 switch (AttributeList::getKind(AttrName, ScopeName,
2937 AttributeList::AS_CXX11)) {
2938 // No arguments
2939 case AttributeList::AT_CarriesDependency:
2940 // FIXME: implement generic support of attributes with C++11 syntax
2941 // see Parse/ParseDecl.cpp: ParseGNUAttributes
2942 case AttributeList::AT_FallThrough:
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,
2951 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc,
2952 AttrLoc),
2953 ScopeName, ScopeLoc, 0,
2954 SourceLocation(), 0, 0, AttributeList::AS_CXX11);
2955 AttrParsed = true;
2956 break;
2957 }
2958
2959 // Silence warnings
2960 default: break;
2961 }
2962
2963 // Skip the entire parameter clause, if any
2964 if (!AttrParsed && Tok.is(tok::l_paren)) {
2965 ConsumeParen();
2966 // SkipUntil maintains the balancedness of tokens.
2967 SkipUntil(tok::r_paren, false);
2968 }
2969
2970 if (Tok.is(tok::ellipsis)) {
2971 if (AttrParsed)
2972 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis)
2973 << AttrName->getName();
2974 ConsumeToken();
2975 }
2976 }
2977
2978 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2979 SkipUntil(tok::r_square, false);
2980 if (endLoc)
2981 *endLoc = Tok.getLocation();
2982 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2983 SkipUntil(tok::r_square, false);
2984 }
2985
2986 /// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq.
2987 ///
2988 /// attribute-specifier-seq:
2989 /// attribute-specifier-seq[opt] attribute-specifier
ParseCXX11Attributes(ParsedAttributesWithRange & attrs,SourceLocation * endLoc)2990 void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs,
2991 SourceLocation *endLoc) {
2992 SourceLocation StartLoc = Tok.getLocation(), Loc;
2993 if (!endLoc)
2994 endLoc = &Loc;
2995
2996 do {
2997 ParseCXX11AttributeSpecifier(attrs, endLoc);
2998 } while (isCXX11AttributeSpecifier());
2999
3000 attrs.Range = SourceRange(StartLoc, *endLoc);
3001 }
3002
3003 /// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
3004 ///
3005 /// [MS] ms-attribute:
3006 /// '[' token-seq ']'
3007 ///
3008 /// [MS] ms-attribute-seq:
3009 /// ms-attribute[opt]
3010 /// ms-attribute ms-attribute-seq
ParseMicrosoftAttributes(ParsedAttributes & attrs,SourceLocation * endLoc)3011 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
3012 SourceLocation *endLoc) {
3013 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
3014
3015 while (Tok.is(tok::l_square)) {
3016 // FIXME: If this is actually a C++11 attribute, parse it as one.
3017 ConsumeBracket();
3018 SkipUntil(tok::r_square, true, true);
3019 if (endLoc) *endLoc = Tok.getLocation();
3020 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
3021 }
3022 }
3023
ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,AccessSpecifier & CurAS)3024 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
3025 AccessSpecifier& CurAS) {
3026 IfExistsCondition Result;
3027 if (ParseMicrosoftIfExistsCondition(Result))
3028 return;
3029
3030 BalancedDelimiterTracker Braces(*this, tok::l_brace);
3031 if (Braces.consumeOpen()) {
3032 Diag(Tok, diag::err_expected_lbrace);
3033 return;
3034 }
3035
3036 switch (Result.Behavior) {
3037 case IEB_Parse:
3038 // Parse the declarations below.
3039 break;
3040
3041 case IEB_Dependent:
3042 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists)
3043 << Result.IsIfExists;
3044 // Fall through to skip.
3045
3046 case IEB_Skip:
3047 Braces.skipToEnd();
3048 return;
3049 }
3050
3051 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
3052 // __if_exists, __if_not_exists can nest.
3053 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) {
3054 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
3055 continue;
3056 }
3057
3058 // Check for extraneous top-level semicolon.
3059 if (Tok.is(tok::semi)) {
3060 ConsumeExtraSemi(InsideStruct, TagType);
3061 continue;
3062 }
3063
3064 AccessSpecifier AS = getAccessSpecifierIfPresent();
3065 if (AS != AS_none) {
3066 // Current token is a C++ access specifier.
3067 CurAS = AS;
3068 SourceLocation ASLoc = Tok.getLocation();
3069 ConsumeToken();
3070 if (Tok.is(tok::colon))
3071 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
3072 else
3073 Diag(Tok, diag::err_expected_colon);
3074 ConsumeToken();
3075 continue;
3076 }
3077
3078 // Parse all the comma separated declarators.
3079 ParseCXXClassMemberDeclaration(CurAS, 0);
3080 }
3081
3082 Braces.consumeClose();
3083 }
3084