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 "RAIIObjectsForParser.h"
22 using namespace clang;
23
24 /// ParseNamespace - We know that the current token is a namespace keyword. This
25 /// may either be a top level namespace or a block-level namespace alias. If
26 /// there was an inline keyword, it has already been parsed.
27 ///
28 /// namespace-definition: [C++ 7.3: basic.namespace]
29 /// named-namespace-definition
30 /// unnamed-namespace-definition
31 ///
32 /// unnamed-namespace-definition:
33 /// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
34 ///
35 /// named-namespace-definition:
36 /// original-namespace-definition
37 /// extension-namespace-definition
38 ///
39 /// original-namespace-definition:
40 /// 'inline'[opt] 'namespace' identifier attributes[opt]
41 /// '{' namespace-body '}'
42 ///
43 /// extension-namespace-definition:
44 /// 'inline'[opt] 'namespace' original-namespace-name
45 /// '{' namespace-body '}'
46 ///
47 /// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
48 /// 'namespace' identifier '=' qualified-namespace-specifier ';'
49 ///
ParseNamespace(unsigned Context,SourceLocation & DeclEnd,SourceLocation InlineLoc)50 Decl *Parser::ParseNamespace(unsigned Context,
51 SourceLocation &DeclEnd,
52 SourceLocation InlineLoc) {
53 assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
54 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
55
56 if (Tok.is(tok::code_completion)) {
57 Actions.CodeCompleteNamespaceDecl(getCurScope());
58 ConsumeCodeCompletionToken();
59 }
60
61 SourceLocation IdentLoc;
62 IdentifierInfo *Ident = 0;
63 std::vector<SourceLocation> ExtraIdentLoc;
64 std::vector<IdentifierInfo*> ExtraIdent;
65 std::vector<SourceLocation> ExtraNamespaceLoc;
66
67 Token attrTok;
68
69 if (Tok.is(tok::identifier)) {
70 Ident = Tok.getIdentifierInfo();
71 IdentLoc = ConsumeToken(); // eat the identifier.
72 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
73 ExtraNamespaceLoc.push_back(ConsumeToken());
74 ExtraIdent.push_back(Tok.getIdentifierInfo());
75 ExtraIdentLoc.push_back(ConsumeToken());
76 }
77 }
78
79 // Read label attributes, if present.
80 ParsedAttributes attrs(AttrFactory);
81 if (Tok.is(tok::kw___attribute)) {
82 attrTok = Tok;
83 ParseGNUAttributes(attrs);
84 }
85
86 if (Tok.is(tok::equal)) {
87 if (!attrs.empty())
88 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
89 if (InlineLoc.isValid())
90 Diag(InlineLoc, diag::err_inline_namespace_alias)
91 << FixItHint::CreateRemoval(InlineLoc);
92
93 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
94 }
95
96
97 if (Tok.isNot(tok::l_brace)) {
98 if (!ExtraIdent.empty()) {
99 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
100 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
101 }
102 Diag(Tok, Ident ? diag::err_expected_lbrace :
103 diag::err_expected_ident_lbrace);
104 return 0;
105 }
106
107 SourceLocation LBrace = ConsumeBrace();
108
109 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
110 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
111 getCurScope()->getFnParent()) {
112 if (!ExtraIdent.empty()) {
113 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
114 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
115 }
116 Diag(LBrace, diag::err_namespace_nonnamespace_scope);
117 SkipUntil(tok::r_brace, false);
118 return 0;
119 }
120
121 if (!ExtraIdent.empty()) {
122 TentativeParsingAction TPA(*this);
123 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true);
124 Token rBraceToken = Tok;
125 TPA.Revert();
126
127 if (!rBraceToken.is(tok::r_brace)) {
128 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
129 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
130 } else {
131 std::string NamespaceFix;
132 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
133 E = ExtraIdent.end(); I != E; ++I) {
134 NamespaceFix += " { namespace ";
135 NamespaceFix += (*I)->getName();
136 }
137
138 std::string RBraces;
139 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
140 RBraces += "} ";
141
142 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon)
143 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
144 ExtraIdentLoc.back()),
145 NamespaceFix)
146 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
147 }
148 }
149
150 // If we're still good, complain about inline namespaces in non-C++0x now.
151 if (!getLang().CPlusPlus0x && InlineLoc.isValid())
152 Diag(InlineLoc, diag::ext_inline_namespace);
153
154 // Enter a scope for the namespace.
155 ParseScope NamespaceScope(this, Scope::DeclScope);
156
157 Decl *NamespcDecl =
158 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
159 IdentLoc, Ident, LBrace, attrs.getList());
160
161 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc,
162 "parsing namespace");
163
164 SourceLocation RBraceLoc;
165 // Parse the contents of the namespace. This includes parsing recovery on
166 // any improperly nested namespaces.
167 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
168 InlineLoc, LBrace, attrs, RBraceLoc);
169
170 // Leave the namespace scope.
171 NamespaceScope.Exit();
172
173 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
174
175 DeclEnd = RBraceLoc;
176 return NamespcDecl;
177 }
178
179 /// 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,SourceLocation & LBrace,ParsedAttributes & attrs,SourceLocation & RBraceLoc)180 void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc,
181 std::vector<IdentifierInfo*>& Ident,
182 std::vector<SourceLocation>& NamespaceLoc,
183 unsigned int index, SourceLocation& InlineLoc,
184 SourceLocation& LBrace,
185 ParsedAttributes& attrs,
186 SourceLocation& RBraceLoc) {
187 if (index == Ident.size()) {
188 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
189 ParsedAttributesWithRange attrs(AttrFactory);
190 MaybeParseCXX0XAttributes(attrs);
191 MaybeParseMicrosoftAttributes(attrs);
192 ParseExternalDeclaration(attrs);
193 }
194 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
195
196 return;
197 }
198
199 // Parse improperly nested namespaces.
200 ParseScope NamespaceScope(this, Scope::DeclScope);
201 Decl *NamespcDecl =
202 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
203 NamespaceLoc[index], IdentLoc[index],
204 Ident[index], LBrace, attrs.getList());
205
206 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
207 LBrace, attrs, RBraceLoc);
208
209 NamespaceScope.Exit();
210
211 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
212 }
213
214 /// ParseNamespaceAlias - Parse the part after the '=' in a namespace
215 /// alias definition.
216 ///
ParseNamespaceAlias(SourceLocation NamespaceLoc,SourceLocation AliasLoc,IdentifierInfo * Alias,SourceLocation & DeclEnd)217 Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
218 SourceLocation AliasLoc,
219 IdentifierInfo *Alias,
220 SourceLocation &DeclEnd) {
221 assert(Tok.is(tok::equal) && "Not equal token");
222
223 ConsumeToken(); // eat the '='.
224
225 if (Tok.is(tok::code_completion)) {
226 Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
227 ConsumeCodeCompletionToken();
228 }
229
230 CXXScopeSpec SS;
231 // Parse (optional) nested-name-specifier.
232 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
233
234 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
235 Diag(Tok, diag::err_expected_namespace_name);
236 // Skip to end of the definition and eat the ';'.
237 SkipUntil(tok::semi);
238 return 0;
239 }
240
241 // Parse identifier.
242 IdentifierInfo *Ident = Tok.getIdentifierInfo();
243 SourceLocation IdentLoc = ConsumeToken();
244
245 // Eat the ';'.
246 DeclEnd = Tok.getLocation();
247 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
248 "", tok::semi);
249
250 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias,
251 SS, IdentLoc, Ident);
252 }
253
254 /// ParseLinkage - We know that the current token is a string_literal
255 /// and just before that, that extern was seen.
256 ///
257 /// linkage-specification: [C++ 7.5p2: dcl.link]
258 /// 'extern' string-literal '{' declaration-seq[opt] '}'
259 /// 'extern' string-literal declaration
260 ///
ParseLinkage(ParsingDeclSpec & DS,unsigned Context)261 Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) {
262 assert(Tok.is(tok::string_literal) && "Not a string literal!");
263 llvm::SmallString<8> LangBuffer;
264 bool Invalid = false;
265 llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
266 if (Invalid)
267 return 0;
268
269 SourceLocation Loc = ConsumeStringToken();
270
271 ParseScope LinkageScope(this, Scope::DeclScope);
272 Decl *LinkageSpec
273 = Actions.ActOnStartLinkageSpecification(getCurScope(),
274 DS.getSourceRange().getBegin(),
275 Loc, Lang,
276 Tok.is(tok::l_brace) ? Tok.getLocation()
277 : SourceLocation());
278
279 ParsedAttributesWithRange attrs(AttrFactory);
280 MaybeParseCXX0XAttributes(attrs);
281 MaybeParseMicrosoftAttributes(attrs);
282
283 if (Tok.isNot(tok::l_brace)) {
284 // Reset the source range in DS, as the leading "extern"
285 // does not really belong to the inner declaration ...
286 DS.SetRangeStart(SourceLocation());
287 DS.SetRangeEnd(SourceLocation());
288 // ... but anyway remember that such an "extern" was seen.
289 DS.setExternInLinkageSpec(true);
290 ParseExternalDeclaration(attrs, &DS);
291 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
292 SourceLocation());
293 }
294
295 DS.abort();
296
297 ProhibitAttributes(attrs);
298
299 SourceLocation LBrace = ConsumeBrace();
300 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
301 ParsedAttributesWithRange attrs(AttrFactory);
302 MaybeParseCXX0XAttributes(attrs);
303 MaybeParseMicrosoftAttributes(attrs);
304 ParseExternalDeclaration(attrs);
305 }
306
307 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
308 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec,
309 RBrace);
310 }
311
312 /// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
313 /// using-directive. Assumes that current token is 'using'.
ParseUsingDirectiveOrDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,Decl ** OwnedType)314 Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
315 const ParsedTemplateInfo &TemplateInfo,
316 SourceLocation &DeclEnd,
317 ParsedAttributesWithRange &attrs,
318 Decl **OwnedType) {
319 assert(Tok.is(tok::kw_using) && "Not using token");
320
321 // Eat 'using'.
322 SourceLocation UsingLoc = ConsumeToken();
323
324 if (Tok.is(tok::code_completion)) {
325 Actions.CodeCompleteUsing(getCurScope());
326 ConsumeCodeCompletionToken();
327 }
328
329 // 'using namespace' means this is a using-directive.
330 if (Tok.is(tok::kw_namespace)) {
331 // Template parameters are always an error here.
332 if (TemplateInfo.Kind) {
333 SourceRange R = TemplateInfo.getSourceRange();
334 Diag(UsingLoc, diag::err_templated_using_directive)
335 << R << FixItHint::CreateRemoval(R);
336 }
337
338 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
339 }
340
341 // Otherwise, it must be a using-declaration or an alias-declaration.
342
343 // Using declarations can't have attributes.
344 ProhibitAttributes(attrs);
345
346 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
347 AS_none, OwnedType);
348 }
349
350 /// ParseUsingDirective - Parse C++ using-directive, assumes
351 /// that current token is 'namespace' and 'using' was already parsed.
352 ///
353 /// using-directive: [C++ 7.3.p4: namespace.udir]
354 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
355 /// namespace-name ;
356 /// [GNU] using-directive:
357 /// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
358 /// namespace-name attributes[opt] ;
359 ///
ParseUsingDirective(unsigned Context,SourceLocation UsingLoc,SourceLocation & DeclEnd,ParsedAttributes & attrs)360 Decl *Parser::ParseUsingDirective(unsigned Context,
361 SourceLocation UsingLoc,
362 SourceLocation &DeclEnd,
363 ParsedAttributes &attrs) {
364 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
365
366 // Eat 'namespace'.
367 SourceLocation NamespcLoc = ConsumeToken();
368
369 if (Tok.is(tok::code_completion)) {
370 Actions.CodeCompleteUsingDirective(getCurScope());
371 ConsumeCodeCompletionToken();
372 }
373
374 CXXScopeSpec SS;
375 // Parse (optional) nested-name-specifier.
376 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
377
378 IdentifierInfo *NamespcName = 0;
379 SourceLocation IdentLoc = SourceLocation();
380
381 // Parse namespace-name.
382 if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
383 Diag(Tok, diag::err_expected_namespace_name);
384 // If there was invalid namespace name, skip to end of decl, and eat ';'.
385 SkipUntil(tok::semi);
386 // FIXME: Are there cases, when we would like to call ActOnUsingDirective?
387 return 0;
388 }
389
390 // Parse identifier.
391 NamespcName = Tok.getIdentifierInfo();
392 IdentLoc = ConsumeToken();
393
394 // Parse (optional) attributes (most likely GNU strong-using extension).
395 bool GNUAttr = false;
396 if (Tok.is(tok::kw___attribute)) {
397 GNUAttr = true;
398 ParseGNUAttributes(attrs);
399 }
400
401 // Eat ';'.
402 DeclEnd = Tok.getLocation();
403 ExpectAndConsume(tok::semi,
404 GNUAttr ? diag::err_expected_semi_after_attribute_list
405 : diag::err_expected_semi_after_namespace_name,
406 "", tok::semi);
407
408 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
409 IdentLoc, NamespcName, attrs.getList());
410 }
411
412 /// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
413 /// Assumes that 'using' was already seen.
414 ///
415 /// using-declaration: [C++ 7.3.p3: namespace.udecl]
416 /// 'using' 'typename'[opt] ::[opt] nested-name-specifier
417 /// unqualified-id
418 /// 'using' :: unqualified-id
419 ///
420 /// alias-declaration: C++0x [decl.typedef]p2
421 /// 'using' identifier = type-id ;
422 ///
ParseUsingDeclaration(unsigned Context,const ParsedTemplateInfo & TemplateInfo,SourceLocation UsingLoc,SourceLocation & DeclEnd,AccessSpecifier AS,Decl ** OwnedType)423 Decl *Parser::ParseUsingDeclaration(unsigned Context,
424 const ParsedTemplateInfo &TemplateInfo,
425 SourceLocation UsingLoc,
426 SourceLocation &DeclEnd,
427 AccessSpecifier AS,
428 Decl **OwnedType) {
429 CXXScopeSpec SS;
430 SourceLocation TypenameLoc;
431 bool IsTypeName;
432
433 // Ignore optional 'typename'.
434 // FIXME: This is wrong; we should parse this as a typename-specifier.
435 if (Tok.is(tok::kw_typename)) {
436 TypenameLoc = Tok.getLocation();
437 ConsumeToken();
438 IsTypeName = true;
439 }
440 else
441 IsTypeName = false;
442
443 // Parse nested-name-specifier.
444 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
445
446 // Check nested-name specifier.
447 if (SS.isInvalid()) {
448 SkipUntil(tok::semi);
449 return 0;
450 }
451
452 // Parse the unqualified-id. We allow parsing of both constructor and
453 // destructor names and allow the action module to diagnose any semantic
454 // errors.
455 UnqualifiedId Name;
456 if (ParseUnqualifiedId(SS,
457 /*EnteringContext=*/false,
458 /*AllowDestructorName=*/true,
459 /*AllowConstructorName=*/true,
460 ParsedType(),
461 Name)) {
462 SkipUntil(tok::semi);
463 return 0;
464 }
465
466 ParsedAttributes attrs(AttrFactory);
467
468 // Maybe this is an alias-declaration.
469 bool IsAliasDecl = Tok.is(tok::equal);
470 TypeResult TypeAlias;
471 if (IsAliasDecl) {
472 // TODO: Attribute support. C++0x attributes may appear before the equals.
473 // Where can GNU attributes appear?
474 ConsumeToken();
475
476 if (!getLang().CPlusPlus0x)
477 Diag(Tok.getLocation(), diag::ext_alias_declaration);
478
479 // Type alias templates cannot be specialized.
480 int SpecKind = -1;
481 if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
482 Name.getKind() == UnqualifiedId::IK_TemplateId)
483 SpecKind = 0;
484 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
485 SpecKind = 1;
486 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
487 SpecKind = 2;
488 if (SpecKind != -1) {
489 SourceRange Range;
490 if (SpecKind == 0)
491 Range = SourceRange(Name.TemplateId->LAngleLoc,
492 Name.TemplateId->RAngleLoc);
493 else
494 Range = TemplateInfo.getSourceRange();
495 Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
496 << SpecKind << Range;
497 SkipUntil(tok::semi);
498 return 0;
499 }
500
501 // Name must be an identifier.
502 if (Name.getKind() != UnqualifiedId::IK_Identifier) {
503 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier);
504 // No removal fixit: can't recover from this.
505 SkipUntil(tok::semi);
506 return 0;
507 } else if (IsTypeName)
508 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier)
509 << FixItHint::CreateRemoval(SourceRange(TypenameLoc,
510 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc));
511 else if (SS.isNotEmpty())
512 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
513 << FixItHint::CreateRemoval(SS.getRange());
514
515 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ?
516 Declarator::AliasTemplateContext :
517 Declarator::AliasDeclContext, 0, AS, OwnedType);
518 } else
519 // Parse (optional) attributes (most likely GNU strong-using extension).
520 MaybeParseGNUAttributes(attrs);
521
522 // Eat ';'.
523 DeclEnd = Tok.getLocation();
524 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
525 !attrs.empty() ? "attributes list" :
526 IsAliasDecl ? "alias declaration" : "using declaration",
527 tok::semi);
528
529 // Diagnose an attempt to declare a templated using-declaration.
530 // In C++0x, alias-declarations can be templates:
531 // template <...> using id = type;
532 if (TemplateInfo.Kind && !IsAliasDecl) {
533 SourceRange R = TemplateInfo.getSourceRange();
534 Diag(UsingLoc, diag::err_templated_using_declaration)
535 << R << FixItHint::CreateRemoval(R);
536
537 // Unfortunately, we have to bail out instead of recovering by
538 // ignoring the parameters, just in case the nested name specifier
539 // depends on the parameters.
540 return 0;
541 }
542
543 if (IsAliasDecl) {
544 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
545 MultiTemplateParamsArg TemplateParamsArg(Actions,
546 TemplateParams ? TemplateParams->data() : 0,
547 TemplateParams ? TemplateParams->size() : 0);
548 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
549 UsingLoc, Name, TypeAlias);
550 }
551
552 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS,
553 Name, attrs.getList(),
554 IsTypeName, TypenameLoc);
555 }
556
557 /// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration.
558 ///
559 /// [C++0x] static_assert-declaration:
560 /// static_assert ( constant-expression , string-literal ) ;
561 ///
562 /// [C1X] static_assert-declaration:
563 /// _Static_assert ( constant-expression , string-literal ) ;
564 ///
ParseStaticAssertDeclaration(SourceLocation & DeclEnd)565 Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
566 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) &&
567 "Not a static_assert declaration");
568
569 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X)
570 Diag(Tok, diag::ext_c1x_static_assert);
571
572 SourceLocation StaticAssertLoc = ConsumeToken();
573
574 if (Tok.isNot(tok::l_paren)) {
575 Diag(Tok, diag::err_expected_lparen);
576 return 0;
577 }
578
579 SourceLocation LParenLoc = ConsumeParen();
580
581 ExprResult AssertExpr(ParseConstantExpression());
582 if (AssertExpr.isInvalid()) {
583 SkipUntil(tok::semi);
584 return 0;
585 }
586
587 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
588 return 0;
589
590 if (Tok.isNot(tok::string_literal)) {
591 Diag(Tok, diag::err_expected_string_literal);
592 SkipUntil(tok::semi);
593 return 0;
594 }
595
596 ExprResult AssertMessage(ParseStringLiteralExpression());
597 if (AssertMessage.isInvalid())
598 return 0;
599
600 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
601
602 DeclEnd = Tok.getLocation();
603 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
604
605 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
606 AssertExpr.take(),
607 AssertMessage.take(),
608 RParenLoc);
609 }
610
611 /// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
612 ///
613 /// 'decltype' ( expression )
614 ///
ParseDecltypeSpecifier(DeclSpec & DS)615 void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
616 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
617
618 SourceLocation StartLoc = ConsumeToken();
619 SourceLocation LParenLoc = Tok.getLocation();
620
621 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
622 "decltype")) {
623 SkipUntil(tok::r_paren);
624 return;
625 }
626
627 // Parse the expression
628
629 // C++0x [dcl.type.simple]p4:
630 // The operand of the decltype specifier is an unevaluated operand.
631 EnterExpressionEvaluationContext Unevaluated(Actions,
632 Sema::Unevaluated);
633 ExprResult Result = ParseExpression();
634 if (Result.isInvalid()) {
635 SkipUntil(tok::r_paren);
636 return;
637 }
638
639 // Match the ')'
640 SourceLocation RParenLoc;
641 if (Tok.is(tok::r_paren))
642 RParenLoc = ConsumeParen();
643 else
644 MatchRHSPunctuation(tok::r_paren, LParenLoc);
645
646 if (RParenLoc.isInvalid())
647 return;
648
649 const char *PrevSpec = 0;
650 unsigned DiagID;
651 // Check for duplicate type specifiers (e.g. "int decltype(a)").
652 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
653 DiagID, Result.release()))
654 Diag(StartLoc, DiagID) << PrevSpec;
655 }
656
ParseUnderlyingTypeSpecifier(DeclSpec & DS)657 void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) {
658 assert(Tok.is(tok::kw___underlying_type) &&
659 "Not an underlying type specifier");
660
661 SourceLocation StartLoc = ConsumeToken();
662 SourceLocation LParenLoc = Tok.getLocation();
663
664 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
665 "__underlying_type")) {
666 SkipUntil(tok::r_paren);
667 return;
668 }
669
670 TypeResult Result = ParseTypeName();
671 if (Result.isInvalid()) {
672 SkipUntil(tok::r_paren);
673 return;
674 }
675
676 // Match the ')'
677 SourceLocation RParenLoc;
678 if (Tok.is(tok::r_paren))
679 RParenLoc = ConsumeParen();
680 else
681 MatchRHSPunctuation(tok::r_paren, LParenLoc);
682
683 if (RParenLoc.isInvalid())
684 return;
685
686 const char *PrevSpec = 0;
687 unsigned DiagID;
688 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec,
689 DiagID, Result.release()))
690 Diag(StartLoc, DiagID) << PrevSpec;
691 }
692
693 /// ParseClassName - Parse a C++ class-name, which names a class. Note
694 /// that we only check that the result names a type; semantic analysis
695 /// will need to verify that the type names a class. The result is
696 /// either a type or NULL, depending on whether a type name was
697 /// found.
698 ///
699 /// class-name: [C++ 9.1]
700 /// identifier
701 /// simple-template-id
702 ///
ParseClassName(SourceLocation & EndLocation,CXXScopeSpec & SS)703 Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
704 CXXScopeSpec &SS) {
705 // Check whether we have a template-id that names a type.
706 if (Tok.is(tok::annot_template_id)) {
707 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
708 if (TemplateId->Kind == TNK_Type_template ||
709 TemplateId->Kind == TNK_Dependent_template_name) {
710 AnnotateTemplateIdTokenAsType();
711
712 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
713 ParsedType Type = getTypeAnnotation(Tok);
714 EndLocation = Tok.getAnnotationEndLoc();
715 ConsumeToken();
716
717 if (Type)
718 return Type;
719 return true;
720 }
721
722 // Fall through to produce an error below.
723 }
724
725 if (Tok.isNot(tok::identifier)) {
726 Diag(Tok, diag::err_expected_class_name);
727 return true;
728 }
729
730 IdentifierInfo *Id = Tok.getIdentifierInfo();
731 SourceLocation IdLoc = ConsumeToken();
732
733 if (Tok.is(tok::less)) {
734 // It looks the user intended to write a template-id here, but the
735 // template-name was wrong. Try to fix that.
736 TemplateNameKind TNK = TNK_Type_template;
737 TemplateTy Template;
738 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(),
739 &SS, Template, TNK)) {
740 Diag(IdLoc, diag::err_unknown_template_name)
741 << Id;
742 }
743
744 if (!Template)
745 return true;
746
747 // Form the template name
748 UnqualifiedId TemplateName;
749 TemplateName.setIdentifier(Id, IdLoc);
750
751 // Parse the full template-id, then turn it into a type.
752 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
753 SourceLocation(), true))
754 return true;
755 if (TNK == TNK_Dependent_template_name)
756 AnnotateTemplateIdTokenAsType();
757
758 // If we didn't end up with a typename token, there's nothing more we
759 // can do.
760 if (Tok.isNot(tok::annot_typename))
761 return true;
762
763 // Retrieve the type from the annotation token, consume that token, and
764 // return.
765 EndLocation = Tok.getAnnotationEndLoc();
766 ParsedType Type = getTypeAnnotation(Tok);
767 ConsumeToken();
768 return Type;
769 }
770
771 // We have an identifier; check whether it is actually a type.
772 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true,
773 false, ParsedType(),
774 /*NonTrivialTypeSourceInfo=*/true);
775 if (!Type) {
776 Diag(IdLoc, diag::err_expected_class_name);
777 return true;
778 }
779
780 // Consume the identifier.
781 EndLocation = IdLoc;
782
783 // Fake up a Declarator to use with ActOnTypeName.
784 DeclSpec DS(AttrFactory);
785 DS.SetRangeStart(IdLoc);
786 DS.SetRangeEnd(EndLocation);
787 DS.getTypeSpecScope() = SS;
788
789 const char *PrevSpec = 0;
790 unsigned DiagID;
791 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type);
792
793 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
794 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
795 }
796
797 /// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
798 /// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
799 /// until we reach the start of a definition or see a token that
800 /// cannot start a definition. If SuppressDeclarations is true, we do know.
801 ///
802 /// class-specifier: [C++ class]
803 /// class-head '{' member-specification[opt] '}'
804 /// class-head '{' member-specification[opt] '}' attributes[opt]
805 /// class-head:
806 /// class-key identifier[opt] base-clause[opt]
807 /// class-key nested-name-specifier identifier base-clause[opt]
808 /// class-key nested-name-specifier[opt] simple-template-id
809 /// base-clause[opt]
810 /// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
811 /// [GNU] class-key attributes[opt] nested-name-specifier
812 /// identifier base-clause[opt]
813 /// [GNU] class-key attributes[opt] nested-name-specifier[opt]
814 /// simple-template-id base-clause[opt]
815 /// class-key:
816 /// 'class'
817 /// 'struct'
818 /// 'union'
819 ///
820 /// elaborated-type-specifier: [C++ dcl.type.elab]
821 /// class-key ::[opt] nested-name-specifier[opt] identifier
822 /// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
823 /// simple-template-id
824 ///
825 /// Note that the C++ class-specifier and elaborated-type-specifier,
826 /// together, subsume the C99 struct-or-union-specifier:
827 ///
828 /// struct-or-union-specifier: [C99 6.7.2.1]
829 /// struct-or-union identifier[opt] '{' struct-contents '}'
830 /// struct-or-union identifier
831 /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
832 /// '}' attributes[opt]
833 /// [GNU] struct-or-union attributes[opt] identifier
834 /// struct-or-union:
835 /// 'struct'
836 /// 'union'
ParseClassSpecifier(tok::TokenKind TagTokKind,SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,bool SuppressDeclarations)837 void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
838 SourceLocation StartLoc, DeclSpec &DS,
839 const ParsedTemplateInfo &TemplateInfo,
840 AccessSpecifier AS, bool SuppressDeclarations){
841 DeclSpec::TST TagType;
842 if (TagTokKind == tok::kw_struct)
843 TagType = DeclSpec::TST_struct;
844 else if (TagTokKind == tok::kw_class)
845 TagType = DeclSpec::TST_class;
846 else {
847 assert(TagTokKind == tok::kw_union && "Not a class specifier");
848 TagType = DeclSpec::TST_union;
849 }
850
851 if (Tok.is(tok::code_completion)) {
852 // Code completion for a struct, class, or union name.
853 Actions.CodeCompleteTag(getCurScope(), TagType);
854 ConsumeCodeCompletionToken();
855 }
856
857 // C++03 [temp.explicit] 14.7.2/8:
858 // The usual access checking rules do not apply to names used to specify
859 // explicit instantiations.
860 //
861 // As an extension we do not perform access checking on the names used to
862 // specify explicit specializations either. This is important to allow
863 // specializing traits classes for private types.
864 bool SuppressingAccessChecks = false;
865 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
866 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) {
867 Actions.ActOnStartSuppressingAccessChecks();
868 SuppressingAccessChecks = true;
869 }
870
871 ParsedAttributes attrs(AttrFactory);
872 // If attributes exist after tag, parse them.
873 if (Tok.is(tok::kw___attribute))
874 ParseGNUAttributes(attrs);
875
876 // If declspecs exist after tag, parse them.
877 while (Tok.is(tok::kw___declspec))
878 ParseMicrosoftDeclSpec(attrs);
879
880 // If C++0x attributes exist here, parse them.
881 // FIXME: Are we consistent with the ordering of parsing of different
882 // styles of attributes?
883 MaybeParseCXX0XAttributes(attrs);
884
885 if (TagType == DeclSpec::TST_struct &&
886 !Tok.is(tok::identifier) &&
887 Tok.getIdentifierInfo() &&
888 (Tok.is(tok::kw___is_arithmetic) ||
889 Tok.is(tok::kw___is_convertible) ||
890 Tok.is(tok::kw___is_empty) ||
891 Tok.is(tok::kw___is_floating_point) ||
892 Tok.is(tok::kw___is_function) ||
893 Tok.is(tok::kw___is_fundamental) ||
894 Tok.is(tok::kw___is_integral) ||
895 Tok.is(tok::kw___is_member_function_pointer) ||
896 Tok.is(tok::kw___is_member_pointer) ||
897 Tok.is(tok::kw___is_pod) ||
898 Tok.is(tok::kw___is_pointer) ||
899 Tok.is(tok::kw___is_same) ||
900 Tok.is(tok::kw___is_scalar) ||
901 Tok.is(tok::kw___is_signed) ||
902 Tok.is(tok::kw___is_unsigned) ||
903 Tok.is(tok::kw___is_void))) {
904 // GNU libstdc++ 4.2 and libc++ uaw certain intrinsic names as the
905 // name of struct templates, but some are keywords in GCC >= 4.3
906 // and Clang. Therefore, when we see the token sequence "struct
907 // X", make X into a normal identifier rather than a keyword, to
908 // allow libstdc++ 4.2 and libc++ to work properly.
909 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
910 Tok.setKind(tok::identifier);
911 }
912
913 // Parse the (optional) nested-name-specifier.
914 CXXScopeSpec &SS = DS.getTypeSpecScope();
915 if (getLang().CPlusPlus) {
916 // "FOO : BAR" is not a potential typo for "FOO::BAR".
917 ColonProtectionRAIIObject X(*this);
918
919 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true))
920 DS.SetTypeSpecError();
921 if (SS.isSet())
922 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
923 Diag(Tok, diag::err_expected_ident);
924 }
925
926 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
927
928 // Parse the (optional) class name or simple-template-id.
929 IdentifierInfo *Name = 0;
930 SourceLocation NameLoc;
931 TemplateIdAnnotation *TemplateId = 0;
932 if (Tok.is(tok::identifier)) {
933 Name = Tok.getIdentifierInfo();
934 NameLoc = ConsumeToken();
935
936 if (Tok.is(tok::less) && getLang().CPlusPlus) {
937 // The name was supposed to refer to a template, but didn't.
938 // Eat the template argument list and try to continue parsing this as
939 // a class (or template thereof).
940 TemplateArgList TemplateArgs;
941 SourceLocation LAngleLoc, RAngleLoc;
942 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS,
943 true, LAngleLoc,
944 TemplateArgs, RAngleLoc)) {
945 // We couldn't parse the template argument list at all, so don't
946 // try to give any location information for the list.
947 LAngleLoc = RAngleLoc = SourceLocation();
948 }
949
950 Diag(NameLoc, diag::err_explicit_spec_non_template)
951 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
952 << (TagType == DeclSpec::TST_class? 0
953 : TagType == DeclSpec::TST_struct? 1
954 : 2)
955 << Name
956 << SourceRange(LAngleLoc, RAngleLoc);
957
958 // Strip off the last template parameter list if it was empty, since
959 // we've removed its template argument list.
960 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
961 if (TemplateParams && TemplateParams->size() > 1) {
962 TemplateParams->pop_back();
963 } else {
964 TemplateParams = 0;
965 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
966 = ParsedTemplateInfo::NonTemplate;
967 }
968 } else if (TemplateInfo.Kind
969 == ParsedTemplateInfo::ExplicitInstantiation) {
970 // Pretend this is just a forward declaration.
971 TemplateParams = 0;
972 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
973 = ParsedTemplateInfo::NonTemplate;
974 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
975 = SourceLocation();
976 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
977 = SourceLocation();
978 }
979 }
980 } else if (Tok.is(tok::annot_template_id)) {
981 TemplateId = takeTemplateIdAnnotation(Tok);
982 NameLoc = ConsumeToken();
983
984 if (TemplateId->Kind != TNK_Type_template &&
985 TemplateId->Kind != TNK_Dependent_template_name) {
986 // The template-name in the simple-template-id refers to
987 // something other than a class template. Give an appropriate
988 // error message and skip to the ';'.
989 SourceRange Range(NameLoc);
990 if (SS.isNotEmpty())
991 Range.setBegin(SS.getBeginLoc());
992
993 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
994 << Name << static_cast<int>(TemplateId->Kind) << Range;
995
996 DS.SetTypeSpecError();
997 SkipUntil(tok::semi, false, true);
998 if (SuppressingAccessChecks)
999 Actions.ActOnStopSuppressingAccessChecks();
1000
1001 return;
1002 }
1003 }
1004
1005 // As soon as we're finished parsing the class's template-id, turn access
1006 // checking back on.
1007 if (SuppressingAccessChecks)
1008 Actions.ActOnStopSuppressingAccessChecks();
1009
1010 // There are four options here. If we have 'struct foo;', then this
1011 // is either a forward declaration or a friend declaration, which
1012 // have to be treated differently. If we have 'struct foo {...',
1013 // 'struct foo :...' or 'struct foo final[opt]' then this is a
1014 // definition. Otherwise we have something like 'struct foo xyz', a reference.
1015 // However, in some contexts, things look like declarations but are just
1016 // references, e.g.
1017 // new struct s;
1018 // or
1019 // &T::operator struct s;
1020 // For these, SuppressDeclarations is true.
1021 Sema::TagUseKind TUK;
1022 if (SuppressDeclarations)
1023 TUK = Sema::TUK_Reference;
1024 else if (Tok.is(tok::l_brace) ||
1025 (getLang().CPlusPlus && Tok.is(tok::colon)) ||
1026 isCXX0XFinalKeyword()) {
1027 if (DS.isFriendSpecified()) {
1028 // C++ [class.friend]p2:
1029 // A class shall not be defined in a friend declaration.
1030 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
1031 << SourceRange(DS.getFriendSpecLoc());
1032
1033 // Skip everything up to the semicolon, so that this looks like a proper
1034 // friend class (or template thereof) declaration.
1035 SkipUntil(tok::semi, true, true);
1036 TUK = Sema::TUK_Friend;
1037 } else {
1038 // Okay, this is a class definition.
1039 TUK = Sema::TUK_Definition;
1040 }
1041 } else if (Tok.is(tok::semi))
1042 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
1043 else
1044 TUK = Sema::TUK_Reference;
1045
1046 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error ||
1047 TUK != Sema::TUK_Definition)) {
1048 if (DS.getTypeSpecType() != DeclSpec::TST_error) {
1049 // We have a declaration or reference to an anonymous class.
1050 Diag(StartLoc, diag::err_anon_type_definition)
1051 << DeclSpec::getSpecifierName(TagType);
1052 }
1053
1054 SkipUntil(tok::comma, true);
1055 return;
1056 }
1057
1058 // Create the tag portion of the class or class template.
1059 DeclResult TagOrTempResult = true; // invalid
1060 TypeResult TypeResult = true; // invalid
1061
1062 bool Owned = false;
1063 if (TemplateId) {
1064 // Explicit specialization, class template partial specialization,
1065 // or explicit instantiation.
1066 ASTTemplateArgsPtr TemplateArgsPtr(Actions,
1067 TemplateId->getTemplateArgs(),
1068 TemplateId->NumArgs);
1069 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1070 TUK == Sema::TUK_Declaration) {
1071 // This is an explicit instantiation of a class template.
1072 TagOrTempResult
1073 = Actions.ActOnExplicitInstantiation(getCurScope(),
1074 TemplateInfo.ExternLoc,
1075 TemplateInfo.TemplateLoc,
1076 TagType,
1077 StartLoc,
1078 SS,
1079 TemplateId->Template,
1080 TemplateId->TemplateNameLoc,
1081 TemplateId->LAngleLoc,
1082 TemplateArgsPtr,
1083 TemplateId->RAngleLoc,
1084 attrs.getList());
1085
1086 // Friend template-ids are treated as references unless
1087 // they have template headers, in which case they're ill-formed
1088 // (FIXME: "template <class T> friend class A<T>::B<int>;").
1089 // We diagnose this error in ActOnClassTemplateSpecialization.
1090 } else if (TUK == Sema::TUK_Reference ||
1091 (TUK == Sema::TUK_Friend &&
1092 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
1093 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType,
1094 StartLoc,
1095 TemplateId->SS,
1096 TemplateId->Template,
1097 TemplateId->TemplateNameLoc,
1098 TemplateId->LAngleLoc,
1099 TemplateArgsPtr,
1100 TemplateId->RAngleLoc);
1101 } else {
1102 // This is an explicit specialization or a class template
1103 // partial specialization.
1104 TemplateParameterLists FakedParamLists;
1105
1106 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
1107 // This looks like an explicit instantiation, because we have
1108 // something like
1109 //
1110 // template class Foo<X>
1111 //
1112 // but it actually has a definition. Most likely, this was
1113 // meant to be an explicit specialization, but the user forgot
1114 // the '<>' after 'template'.
1115 assert(TUK == Sema::TUK_Definition && "Expected a definition here");
1116
1117 SourceLocation LAngleLoc
1118 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
1119 Diag(TemplateId->TemplateNameLoc,
1120 diag::err_explicit_instantiation_with_definition)
1121 << SourceRange(TemplateInfo.TemplateLoc)
1122 << FixItHint::CreateInsertion(LAngleLoc, "<>");
1123
1124 // Create a fake template parameter list that contains only
1125 // "template<>", so that we treat this construct as a class
1126 // template specialization.
1127 FakedParamLists.push_back(
1128 Actions.ActOnTemplateParameterList(0, SourceLocation(),
1129 TemplateInfo.TemplateLoc,
1130 LAngleLoc,
1131 0, 0,
1132 LAngleLoc));
1133 TemplateParams = &FakedParamLists;
1134 }
1135
1136 // Build the class template specialization.
1137 TagOrTempResult
1138 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK,
1139 StartLoc, SS,
1140 TemplateId->Template,
1141 TemplateId->TemplateNameLoc,
1142 TemplateId->LAngleLoc,
1143 TemplateArgsPtr,
1144 TemplateId->RAngleLoc,
1145 attrs.getList(),
1146 MultiTemplateParamsArg(Actions,
1147 TemplateParams? &(*TemplateParams)[0] : 0,
1148 TemplateParams? TemplateParams->size() : 0));
1149 }
1150 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1151 TUK == Sema::TUK_Declaration) {
1152 // Explicit instantiation of a member of a class template
1153 // specialization, e.g.,
1154 //
1155 // template struct Outer<int>::Inner;
1156 //
1157 TagOrTempResult
1158 = Actions.ActOnExplicitInstantiation(getCurScope(),
1159 TemplateInfo.ExternLoc,
1160 TemplateInfo.TemplateLoc,
1161 TagType, StartLoc, SS, Name,
1162 NameLoc, attrs.getList());
1163 } else if (TUK == Sema::TUK_Friend &&
1164 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) {
1165 TagOrTempResult =
1166 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(),
1167 TagType, StartLoc, SS,
1168 Name, NameLoc, attrs.getList(),
1169 MultiTemplateParamsArg(Actions,
1170 TemplateParams? &(*TemplateParams)[0] : 0,
1171 TemplateParams? TemplateParams->size() : 0));
1172 } else {
1173 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
1174 TUK == Sema::TUK_Definition) {
1175 // FIXME: Diagnose this particular error.
1176 }
1177
1178 bool IsDependent = false;
1179
1180 // Don't pass down template parameter lists if this is just a tag
1181 // reference. For example, we don't need the template parameters here:
1182 // template <class T> class A *makeA(T t);
1183 MultiTemplateParamsArg TParams;
1184 if (TUK != Sema::TUK_Reference && TemplateParams)
1185 TParams =
1186 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size());
1187
1188 // Declaration or definition of a class type
1189 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc,
1190 SS, Name, NameLoc, attrs.getList(), AS,
1191 TParams, Owned, IsDependent, false,
1192 false, clang::TypeResult());
1193
1194 // If ActOnTag said the type was dependent, try again with the
1195 // less common call.
1196 if (IsDependent) {
1197 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend);
1198 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK,
1199 SS, Name, StartLoc, NameLoc);
1200 }
1201 }
1202
1203 // If there is a body, parse it and inform the actions module.
1204 if (TUK == Sema::TUK_Definition) {
1205 assert(Tok.is(tok::l_brace) ||
1206 (getLang().CPlusPlus && Tok.is(tok::colon)) ||
1207 isCXX0XFinalKeyword());
1208 if (getLang().CPlusPlus)
1209 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
1210 else
1211 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
1212 }
1213
1214 const char *PrevSpec = 0;
1215 unsigned DiagID;
1216 bool Result;
1217 if (!TypeResult.isInvalid()) {
1218 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
1219 NameLoc.isValid() ? NameLoc : StartLoc,
1220 PrevSpec, DiagID, TypeResult.get());
1221 } else if (!TagOrTempResult.isInvalid()) {
1222 Result = DS.SetTypeSpecType(TagType, StartLoc,
1223 NameLoc.isValid() ? NameLoc : StartLoc,
1224 PrevSpec, DiagID, TagOrTempResult.get(), Owned);
1225 } else {
1226 DS.SetTypeSpecError();
1227 return;
1228 }
1229
1230 if (Result)
1231 Diag(StartLoc, DiagID) << PrevSpec;
1232
1233 // At this point, we've successfully parsed a class-specifier in 'definition'
1234 // form (e.g. "struct foo { int x; }". While we could just return here, we're
1235 // going to look at what comes after it to improve error recovery. If an
1236 // impossible token occurs next, we assume that the programmer forgot a ; at
1237 // the end of the declaration and recover that way.
1238 //
1239 // This switch enumerates the valid "follow" set for definition.
1240 if (TUK == Sema::TUK_Definition) {
1241 bool ExpectedSemi = true;
1242 switch (Tok.getKind()) {
1243 default: break;
1244 case tok::semi: // struct foo {...} ;
1245 case tok::star: // struct foo {...} * P;
1246 case tok::amp: // struct foo {...} & R = ...
1247 case tok::identifier: // struct foo {...} V ;
1248 case tok::r_paren: //(struct foo {...} ) {4}
1249 case tok::annot_cxxscope: // struct foo {...} a:: b;
1250 case tok::annot_typename: // struct foo {...} a ::b;
1251 case tok::annot_template_id: // struct foo {...} a<int> ::b;
1252 case tok::l_paren: // struct foo {...} ( x);
1253 case tok::comma: // __builtin_offsetof(struct foo{...} ,
1254 ExpectedSemi = false;
1255 break;
1256 // Type qualifiers
1257 case tok::kw_const: // struct foo {...} const x;
1258 case tok::kw_volatile: // struct foo {...} volatile x;
1259 case tok::kw_restrict: // struct foo {...} restrict x;
1260 case tok::kw_inline: // struct foo {...} inline foo() {};
1261 // Storage-class specifiers
1262 case tok::kw_static: // struct foo {...} static x;
1263 case tok::kw_extern: // struct foo {...} extern x;
1264 case tok::kw_typedef: // struct foo {...} typedef x;
1265 case tok::kw_register: // struct foo {...} register x;
1266 case tok::kw_auto: // struct foo {...} auto x;
1267 case tok::kw_mutable: // struct foo {...} mutable x;
1268 // As shown above, type qualifiers and storage class specifiers absolutely
1269 // can occur after class specifiers according to the grammar. However,
1270 // almost no one actually writes code like this. If we see one of these,
1271 // it is much more likely that someone missed a semi colon and the
1272 // type/storage class specifier we're seeing is part of the *next*
1273 // intended declaration, as in:
1274 //
1275 // struct foo { ... }
1276 // typedef int X;
1277 //
1278 // We'd really like to emit a missing semicolon error instead of emitting
1279 // an error on the 'int' saying that you can't have two type specifiers in
1280 // the same declaration of X. Because of this, we look ahead past this
1281 // token to see if it's a type specifier. If so, we know the code is
1282 // otherwise invalid, so we can produce the expected semi error.
1283 if (!isKnownToBeTypeSpecifier(NextToken()))
1284 ExpectedSemi = false;
1285 break;
1286
1287 case tok::r_brace: // struct bar { struct foo {...} }
1288 // Missing ';' at end of struct is accepted as an extension in C mode.
1289 if (!getLang().CPlusPlus)
1290 ExpectedSemi = false;
1291 break;
1292 }
1293
1294 // C++ [temp]p3 In a template-declaration which defines a class, no
1295 // declarator is permitted.
1296 if (TemplateInfo.Kind)
1297 ExpectedSemi = true;
1298
1299 if (ExpectedSemi) {
1300 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
1301 TagType == DeclSpec::TST_class ? "class"
1302 : TagType == DeclSpec::TST_struct? "struct" : "union");
1303 // Push this token back into the preprocessor and change our current token
1304 // to ';' so that the rest of the code recovers as though there were an
1305 // ';' after the definition.
1306 PP.EnterToken(Tok);
1307 Tok.setKind(tok::semi);
1308 }
1309 }
1310 }
1311
1312 /// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
1313 ///
1314 /// base-clause : [C++ class.derived]
1315 /// ':' base-specifier-list
1316 /// base-specifier-list:
1317 /// base-specifier '...'[opt]
1318 /// base-specifier-list ',' base-specifier '...'[opt]
ParseBaseClause(Decl * ClassDecl)1319 void Parser::ParseBaseClause(Decl *ClassDecl) {
1320 assert(Tok.is(tok::colon) && "Not a base clause");
1321 ConsumeToken();
1322
1323 // Build up an array of parsed base specifiers.
1324 llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo;
1325
1326 while (true) {
1327 // Parse a base-specifier.
1328 BaseResult Result = ParseBaseSpecifier(ClassDecl);
1329 if (Result.isInvalid()) {
1330 // Skip the rest of this base specifier, up until the comma or
1331 // opening brace.
1332 SkipUntil(tok::comma, tok::l_brace, true, true);
1333 } else {
1334 // Add this to our array of base specifiers.
1335 BaseInfo.push_back(Result.get());
1336 }
1337
1338 // If the next token is a comma, consume it and keep reading
1339 // base-specifiers.
1340 if (Tok.isNot(tok::comma)) break;
1341
1342 // Consume the comma.
1343 ConsumeToken();
1344 }
1345
1346 // Attach the base specifiers
1347 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
1348 }
1349
1350 /// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
1351 /// one entry in the base class list of a class specifier, for example:
1352 /// class foo : public bar, virtual private baz {
1353 /// 'public bar' and 'virtual private baz' are each base-specifiers.
1354 ///
1355 /// base-specifier: [C++ class.derived]
1356 /// ::[opt] nested-name-specifier[opt] class-name
1357 /// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
1358 /// class-name
1359 /// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
1360 /// class-name
ParseBaseSpecifier(Decl * ClassDecl)1361 Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) {
1362 bool IsVirtual = false;
1363 SourceLocation StartLoc = Tok.getLocation();
1364
1365 // Parse the 'virtual' keyword.
1366 if (Tok.is(tok::kw_virtual)) {
1367 ConsumeToken();
1368 IsVirtual = true;
1369 }
1370
1371 // Parse an (optional) access specifier.
1372 AccessSpecifier Access = getAccessSpecifierIfPresent();
1373 if (Access != AS_none)
1374 ConsumeToken();
1375
1376 // Parse the 'virtual' keyword (again!), in case it came after the
1377 // access specifier.
1378 if (Tok.is(tok::kw_virtual)) {
1379 SourceLocation VirtualLoc = ConsumeToken();
1380 if (IsVirtual) {
1381 // Complain about duplicate 'virtual'
1382 Diag(VirtualLoc, diag::err_dup_virtual)
1383 << FixItHint::CreateRemoval(VirtualLoc);
1384 }
1385
1386 IsVirtual = true;
1387 }
1388
1389 // Parse optional '::' and optional nested-name-specifier.
1390 CXXScopeSpec SS;
1391 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
1392
1393 // The location of the base class itself.
1394 SourceLocation BaseLoc = Tok.getLocation();
1395
1396 // Parse the class-name.
1397 SourceLocation EndLocation;
1398 TypeResult BaseType = ParseClassName(EndLocation, SS);
1399 if (BaseType.isInvalid())
1400 return true;
1401
1402 // Parse the optional ellipsis (for a pack expansion). The ellipsis is
1403 // actually part of the base-specifier-list grammar productions, but we
1404 // parse it here for convenience.
1405 SourceLocation EllipsisLoc;
1406 if (Tok.is(tok::ellipsis))
1407 EllipsisLoc = ConsumeToken();
1408
1409 // Find the complete source range for the base-specifier.
1410 SourceRange Range(StartLoc, EndLocation);
1411
1412 // Notify semantic analysis that we have parsed a complete
1413 // base-specifier.
1414 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
1415 BaseType.get(), BaseLoc, EllipsisLoc);
1416 }
1417
1418 /// getAccessSpecifierIfPresent - Determine whether the next token is
1419 /// a C++ access-specifier.
1420 ///
1421 /// access-specifier: [C++ class.derived]
1422 /// 'private'
1423 /// 'protected'
1424 /// 'public'
getAccessSpecifierIfPresent() const1425 AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
1426 switch (Tok.getKind()) {
1427 default: return AS_none;
1428 case tok::kw_private: return AS_private;
1429 case tok::kw_protected: return AS_protected;
1430 case tok::kw_public: return AS_public;
1431 }
1432 }
1433
HandleMemberFunctionDefaultArgs(Declarator & DeclaratorInfo,Decl * ThisDecl)1434 void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
1435 Decl *ThisDecl) {
1436 // We just declared a member function. If this member function
1437 // has any default arguments, we'll need to parse them later.
1438 LateParsedMethodDeclaration *LateMethod = 0;
1439 DeclaratorChunk::FunctionTypeInfo &FTI
1440 = DeclaratorInfo.getFunctionTypeInfo();
1441 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
1442 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
1443 if (!LateMethod) {
1444 // Push this method onto the stack of late-parsed method
1445 // declarations.
1446 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl);
1447 getCurrentClass().LateParsedDeclarations.push_back(LateMethod);
1448 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope();
1449
1450 // Add all of the parameters prior to this one (they don't
1451 // have default arguments).
1452 LateMethod->DefaultArgs.reserve(FTI.NumArgs);
1453 for (unsigned I = 0; I < ParamIdx; ++I)
1454 LateMethod->DefaultArgs.push_back(
1455 LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
1456 }
1457
1458 // Add this parameter to the list of parameters (it or may
1459 // not have a default argument).
1460 LateMethod->DefaultArgs.push_back(
1461 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
1462 FTI.ArgInfo[ParamIdx].DefaultArgTokens));
1463 }
1464 }
1465 }
1466
1467 /// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x
1468 /// virt-specifier.
1469 ///
1470 /// virt-specifier:
1471 /// override
1472 /// final
isCXX0XVirtSpecifier() const1473 VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const {
1474 if (!getLang().CPlusPlus)
1475 return VirtSpecifiers::VS_None;
1476
1477 if (Tok.is(tok::identifier)) {
1478 IdentifierInfo *II = Tok.getIdentifierInfo();
1479
1480 // Initialize the contextual keywords.
1481 if (!Ident_final) {
1482 Ident_final = &PP.getIdentifierTable().get("final");
1483 Ident_override = &PP.getIdentifierTable().get("override");
1484 }
1485
1486 if (II == Ident_override)
1487 return VirtSpecifiers::VS_Override;
1488
1489 if (II == Ident_final)
1490 return VirtSpecifiers::VS_Final;
1491 }
1492
1493 return VirtSpecifiers::VS_None;
1494 }
1495
1496 /// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq.
1497 ///
1498 /// virt-specifier-seq:
1499 /// virt-specifier
1500 /// virt-specifier-seq virt-specifier
ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers & VS)1501 void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) {
1502 while (true) {
1503 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier();
1504 if (Specifier == VirtSpecifiers::VS_None)
1505 return;
1506
1507 // C++ [class.mem]p8:
1508 // A virt-specifier-seq shall contain at most one of each virt-specifier.
1509 const char *PrevSpec = 0;
1510 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec))
1511 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier)
1512 << PrevSpec
1513 << FixItHint::CreateRemoval(Tok.getLocation());
1514
1515 if (!getLang().CPlusPlus0x)
1516 Diag(Tok.getLocation(), diag::ext_override_control_keyword)
1517 << VirtSpecifiers::getSpecifierName(Specifier);
1518 ConsumeToken();
1519 }
1520 }
1521
1522 /// isCXX0XFinalKeyword - Determine whether the next token is a C++0x
1523 /// contextual 'final' keyword.
isCXX0XFinalKeyword() const1524 bool Parser::isCXX0XFinalKeyword() const {
1525 if (!getLang().CPlusPlus)
1526 return false;
1527
1528 if (!Tok.is(tok::identifier))
1529 return false;
1530
1531 // Initialize the contextual keywords.
1532 if (!Ident_final) {
1533 Ident_final = &PP.getIdentifierTable().get("final");
1534 Ident_override = &PP.getIdentifierTable().get("override");
1535 }
1536
1537 return Tok.getIdentifierInfo() == Ident_final;
1538 }
1539
1540 /// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
1541 ///
1542 /// member-declaration:
1543 /// decl-specifier-seq[opt] member-declarator-list[opt] ';'
1544 /// function-definition ';'[opt]
1545 /// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
1546 /// using-declaration [TODO]
1547 /// [C++0x] static_assert-declaration
1548 /// template-declaration
1549 /// [GNU] '__extension__' member-declaration
1550 ///
1551 /// member-declarator-list:
1552 /// member-declarator
1553 /// member-declarator-list ',' member-declarator
1554 ///
1555 /// member-declarator:
1556 /// declarator virt-specifier-seq[opt] pure-specifier[opt]
1557 /// declarator constant-initializer[opt]
1558 /// [C++11] declarator brace-or-equal-initializer[opt]
1559 /// identifier[opt] ':' constant-expression
1560 ///
1561 /// virt-specifier-seq:
1562 /// virt-specifier
1563 /// virt-specifier-seq virt-specifier
1564 ///
1565 /// virt-specifier:
1566 /// override
1567 /// final
1568 /// new
1569 ///
1570 /// pure-specifier:
1571 /// '= 0'
1572 ///
1573 /// constant-initializer:
1574 /// '=' constant-expression
1575 ///
ParseCXXClassMemberDeclaration(AccessSpecifier AS,const ParsedTemplateInfo & TemplateInfo,ParsingDeclRAIIObject * TemplateDiags)1576 void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
1577 const ParsedTemplateInfo &TemplateInfo,
1578 ParsingDeclRAIIObject *TemplateDiags) {
1579 if (Tok.is(tok::at)) {
1580 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs))
1581 Diag(Tok, diag::err_at_defs_cxx);
1582 else
1583 Diag(Tok, diag::err_at_in_class);
1584
1585 ConsumeToken();
1586 SkipUntil(tok::r_brace);
1587 return;
1588 }
1589
1590 // Access declarations.
1591 if (!TemplateInfo.Kind &&
1592 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1593 !TryAnnotateCXXScopeToken() &&
1594 Tok.is(tok::annot_cxxscope)) {
1595 bool isAccessDecl = false;
1596 if (NextToken().is(tok::identifier))
1597 isAccessDecl = GetLookAheadToken(2).is(tok::semi);
1598 else
1599 isAccessDecl = NextToken().is(tok::kw_operator);
1600
1601 if (isAccessDecl) {
1602 // Collect the scope specifier token we annotated earlier.
1603 CXXScopeSpec SS;
1604 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
1605
1606 // Try to parse an unqualified-id.
1607 UnqualifiedId Name;
1608 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) {
1609 SkipUntil(tok::semi);
1610 return;
1611 }
1612
1613 // TODO: recover from mistakenly-qualified operator declarations.
1614 if (ExpectAndConsume(tok::semi,
1615 diag::err_expected_semi_after,
1616 "access declaration",
1617 tok::semi))
1618 return;
1619
1620 Actions.ActOnUsingDeclaration(getCurScope(), AS,
1621 false, SourceLocation(),
1622 SS, Name,
1623 /* AttrList */ 0,
1624 /* IsTypeName */ false,
1625 SourceLocation());
1626 return;
1627 }
1628 }
1629
1630 // static_assert-declaration
1631 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) {
1632 // FIXME: Check for templates
1633 SourceLocation DeclEnd;
1634 ParseStaticAssertDeclaration(DeclEnd);
1635 return;
1636 }
1637
1638 if (Tok.is(tok::kw_template)) {
1639 assert(!TemplateInfo.TemplateParams &&
1640 "Nested template improperly parsed?");
1641 SourceLocation DeclEnd;
1642 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
1643 AS);
1644 return;
1645 }
1646
1647 // Handle: member-declaration ::= '__extension__' member-declaration
1648 if (Tok.is(tok::kw___extension__)) {
1649 // __extension__ silences extension warnings in the subexpression.
1650 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1651 ConsumeToken();
1652 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags);
1653 }
1654
1655 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
1656 // is a bitfield.
1657 ColonProtectionRAIIObject X(*this);
1658
1659 ParsedAttributesWithRange attrs(AttrFactory);
1660 // Optional C++0x attribute-specifier
1661 MaybeParseCXX0XAttributes(attrs);
1662 MaybeParseMicrosoftAttributes(attrs);
1663
1664 if (Tok.is(tok::kw_using)) {
1665 ProhibitAttributes(attrs);
1666
1667 // Eat 'using'.
1668 SourceLocation UsingLoc = ConsumeToken();
1669
1670 if (Tok.is(tok::kw_namespace)) {
1671 Diag(UsingLoc, diag::err_using_namespace_in_class);
1672 SkipUntil(tok::semi, true, true);
1673 } else {
1674 SourceLocation DeclEnd;
1675 // Otherwise, it must be a using-declaration or an alias-declaration.
1676 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo,
1677 UsingLoc, DeclEnd, AS);
1678 }
1679 return;
1680 }
1681
1682 // decl-specifier-seq:
1683 // Parse the common declaration-specifiers piece.
1684 ParsingDeclSpec DS(*this, TemplateDiags);
1685 DS.takeAttributesFrom(attrs);
1686 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
1687
1688 MultiTemplateParamsArg TemplateParams(Actions,
1689 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
1690 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
1691
1692 if (Tok.is(tok::semi)) {
1693 ConsumeToken();
1694 Decl *TheDecl =
1695 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams);
1696 DS.complete(TheDecl);
1697 return;
1698 }
1699
1700 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
1701 VirtSpecifiers VS;
1702 ExprResult Init;
1703
1704 if (Tok.isNot(tok::colon)) {
1705 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
1706 ColonProtectionRAIIObject X(*this);
1707
1708 // Parse the first declarator.
1709 ParseDeclarator(DeclaratorInfo);
1710 // Error parsing the declarator?
1711 if (!DeclaratorInfo.hasName()) {
1712 // If so, skip until the semi-colon or a }.
1713 SkipUntil(tok::r_brace, true, true);
1714 if (Tok.is(tok::semi))
1715 ConsumeToken();
1716 return;
1717 }
1718
1719 ParseOptionalCXX0XVirtSpecifierSeq(VS);
1720
1721 // If attributes exist after the declarator, but before an '{', parse them.
1722 MaybeParseGNUAttributes(DeclaratorInfo);
1723
1724 // MSVC permits pure specifier on inline functions declared at class scope.
1725 // Hence check for =0 before checking for function definition.
1726 if (getLang().Microsoft && Tok.is(tok::equal) &&
1727 DeclaratorInfo.isFunctionDeclarator() &&
1728 NextToken().is(tok::numeric_constant)) {
1729 ConsumeToken();
1730 Init = ParseInitializer();
1731 if (Init.isInvalid())
1732 SkipUntil(tok::comma, true, true);
1733 }
1734
1735 bool IsDefinition = false;
1736 // function-definition:
1737 //
1738 // In C++11, a non-function declarator followed by an open brace is a
1739 // braced-init-list for an in-class member initialization, not an
1740 // erroneous function definition.
1741 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) {
1742 IsDefinition = true;
1743 } else if (DeclaratorInfo.isFunctionDeclarator()) {
1744 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
1745 IsDefinition = true;
1746 } else if (Tok.is(tok::equal)) {
1747 const Token &KW = NextToken();
1748 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
1749 IsDefinition = true;
1750 }
1751 }
1752
1753 if (IsDefinition) {
1754 if (!DeclaratorInfo.isFunctionDeclarator()) {
1755 Diag(Tok, diag::err_func_def_no_params);
1756 ConsumeBrace();
1757 SkipUntil(tok::r_brace, true);
1758
1759 // Consume the optional ';'
1760 if (Tok.is(tok::semi))
1761 ConsumeToken();
1762 return;
1763 }
1764
1765 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1766 Diag(Tok, diag::err_function_declared_typedef);
1767 // This recovery skips the entire function body. It would be nice
1768 // to simply call ParseCXXInlineMethodDef() below, however Sema
1769 // assumes the declarator represents a function, not a typedef.
1770 ConsumeBrace();
1771 SkipUntil(tok::r_brace, true);
1772
1773 // Consume the optional ';'
1774 if (Tok.is(tok::semi))
1775 ConsumeToken();
1776 return;
1777 }
1778
1779 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init);
1780
1781 // Consume the ';' - it's optional unless we have a delete or default
1782 if (Tok.is(tok::semi)) {
1783 ConsumeToken();
1784 }
1785
1786 return;
1787 }
1788 }
1789
1790 // member-declarator-list:
1791 // member-declarator
1792 // member-declarator-list ',' member-declarator
1793
1794 llvm::SmallVector<Decl *, 8> DeclsInGroup;
1795 ExprResult BitfieldSize;
1796
1797 while (1) {
1798 // member-declarator:
1799 // declarator pure-specifier[opt]
1800 // declarator brace-or-equal-initializer[opt]
1801 // identifier[opt] ':' constant-expression
1802 if (Tok.is(tok::colon)) {
1803 ConsumeToken();
1804 BitfieldSize = ParseConstantExpression();
1805 if (BitfieldSize.isInvalid())
1806 SkipUntil(tok::comma, true, true);
1807 }
1808
1809 // If a simple-asm-expr is present, parse it.
1810 if (Tok.is(tok::kw_asm)) {
1811 SourceLocation Loc;
1812 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1813 if (AsmLabel.isInvalid())
1814 SkipUntil(tok::comma, true, true);
1815
1816 DeclaratorInfo.setAsmLabel(AsmLabel.release());
1817 DeclaratorInfo.SetRangeEnd(Loc);
1818 }
1819
1820 // If attributes exist after the declarator, parse them.
1821 MaybeParseGNUAttributes(DeclaratorInfo);
1822
1823 // FIXME: When g++ adds support for this, we'll need to check whether it
1824 // goes before or after the GNU attributes and __asm__.
1825 ParseOptionalCXX0XVirtSpecifierSeq(VS);
1826
1827 bool HasDeferredInitializer = false;
1828 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) {
1829 if (BitfieldSize.get()) {
1830 Diag(Tok, diag::err_bitfield_member_init);
1831 SkipUntil(tok::comma, true, true);
1832 } else {
1833 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() &&
1834 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1835 != DeclSpec::SCS_static &&
1836 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1837 != DeclSpec::SCS_typedef;
1838
1839 if (!HasDeferredInitializer) {
1840 SourceLocation EqualLoc;
1841 Init = ParseCXXMemberInitializer(
1842 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
1843 if (Init.isInvalid())
1844 SkipUntil(tok::comma, true, true);
1845 }
1846 }
1847 }
1848
1849 // NOTE: If Sema is the Action module and declarator is an instance field,
1850 // this call will *not* return the created decl; It will return null.
1851 // See Sema::ActOnCXXMemberDeclarator for details.
1852
1853 Decl *ThisDecl = 0;
1854 if (DS.isFriendSpecified()) {
1855 // TODO: handle initializers, bitfields, 'delete'
1856 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo,
1857 /*IsDefinition*/ false,
1858 move(TemplateParams));
1859 } else {
1860 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS,
1861 DeclaratorInfo,
1862 move(TemplateParams),
1863 BitfieldSize.release(),
1864 VS, Init.release(),
1865 HasDeferredInitializer,
1866 /*IsDefinition*/ false);
1867 }
1868 if (ThisDecl)
1869 DeclsInGroup.push_back(ThisDecl);
1870
1871 if (DeclaratorInfo.isFunctionDeclarator() &&
1872 DeclaratorInfo.getDeclSpec().getStorageClassSpec()
1873 != DeclSpec::SCS_typedef) {
1874 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
1875 }
1876
1877 DeclaratorInfo.complete(ThisDecl);
1878
1879 if (HasDeferredInitializer) {
1880 if (!getLang().CPlusPlus0x)
1881 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension);
1882
1883 if (DeclaratorInfo.isArrayOfUnknownBound()) {
1884 // C++0x [dcl.array]p3: An array bound may also be omitted when the
1885 // declarator is followed by an initializer.
1886 //
1887 // A brace-or-equal-initializer for a member-declarator is not an
1888 // initializer in the gramamr, so this is ill-formed.
1889 Diag(Tok, diag::err_incomplete_array_member_init);
1890 SkipUntil(tok::comma, true, true);
1891 // Avoid later warnings about a class member of incomplete type.
1892 ThisDecl->setInvalidDecl();
1893 } else
1894 ParseCXXNonStaticMemberInitializer(ThisDecl);
1895 }
1896
1897 // If we don't have a comma, it is either the end of the list (a ';')
1898 // or an error, bail out.
1899 if (Tok.isNot(tok::comma))
1900 break;
1901
1902 // Consume the comma.
1903 ConsumeToken();
1904
1905 // Parse the next declarator.
1906 DeclaratorInfo.clear();
1907 VS.clear();
1908 BitfieldSize = 0;
1909 Init = 0;
1910
1911 // Attributes are only allowed on the second declarator.
1912 MaybeParseGNUAttributes(DeclaratorInfo);
1913
1914 if (Tok.isNot(tok::colon))
1915 ParseDeclarator(DeclaratorInfo);
1916 }
1917
1918 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
1919 // Skip to end of block or statement.
1920 SkipUntil(tok::r_brace, true, true);
1921 // If we stopped at a ';', eat it.
1922 if (Tok.is(tok::semi)) ConsumeToken();
1923 return;
1924 }
1925
1926 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(),
1927 DeclsInGroup.size());
1928 }
1929
1930 /// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or
1931 /// pure-specifier. Also detect and reject any attempted defaulted/deleted
1932 /// function definition. The location of the '=', if any, will be placed in
1933 /// EqualLoc.
1934 ///
1935 /// pure-specifier:
1936 /// '= 0'
1937 ///
1938 /// brace-or-equal-initializer:
1939 /// '=' initializer-expression
1940 /// braced-init-list [TODO]
1941 ///
1942 /// initializer-clause:
1943 /// assignment-expression
1944 /// braced-init-list [TODO]
1945 ///
1946 /// defaulted/deleted function-definition:
1947 /// '=' 'default'
1948 /// '=' 'delete'
1949 ///
1950 /// Prior to C++0x, the assignment-expression in an initializer-clause must
1951 /// be a constant-expression.
ParseCXXMemberInitializer(bool IsFunction,SourceLocation & EqualLoc)1952 ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction,
1953 SourceLocation &EqualLoc) {
1954 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace))
1955 && "Data member initializer not starting with '=' or '{'");
1956
1957 if (Tok.is(tok::equal)) {
1958 EqualLoc = ConsumeToken();
1959 if (Tok.is(tok::kw_delete)) {
1960 // In principle, an initializer of '= delete p;' is legal, but it will
1961 // never type-check. It's better to diagnose it as an ill-formed expression
1962 // than as an ill-formed deleted non-function member.
1963 // An initializer of '= delete p, foo' will never be parsed, because
1964 // a top-level comma always ends the initializer expression.
1965 const Token &Next = NextToken();
1966 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) ||
1967 Next.is(tok::eof)) {
1968 if (IsFunction)
1969 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
1970 << 1 /* delete */;
1971 else
1972 Diag(ConsumeToken(), diag::err_deleted_non_function);
1973 return ExprResult();
1974 }
1975 } else if (Tok.is(tok::kw_default)) {
1976 Diag(ConsumeToken(), diag::err_default_special_members);
1977 if (IsFunction)
1978 Diag(Tok, diag::err_default_delete_in_multiple_declaration)
1979 << 0 /* default */;
1980 else
1981 Diag(ConsumeToken(), diag::err_default_special_members);
1982 return ExprResult();
1983 }
1984
1985 return ParseInitializer();
1986 } else
1987 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists));
1988 }
1989
1990 /// ParseCXXMemberSpecification - Parse the class definition.
1991 ///
1992 /// member-specification:
1993 /// member-declaration member-specification[opt]
1994 /// access-specifier ':' member-specification[opt]
1995 ///
ParseCXXMemberSpecification(SourceLocation RecordLoc,unsigned TagType,Decl * TagDecl)1996 void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
1997 unsigned TagType, Decl *TagDecl) {
1998 assert((TagType == DeclSpec::TST_struct ||
1999 TagType == DeclSpec::TST_union ||
2000 TagType == DeclSpec::TST_class) && "Invalid TagType!");
2001
2002 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
2003 "parsing struct/union/class body");
2004
2005 // Determine whether this is a non-nested class. Note that local
2006 // classes are *not* considered to be nested classes.
2007 bool NonNestedClass = true;
2008 if (!ClassStack.empty()) {
2009 for (const Scope *S = getCurScope(); S; S = S->getParent()) {
2010 if (S->isClassScope()) {
2011 // We're inside a class scope, so this is a nested class.
2012 NonNestedClass = false;
2013 break;
2014 }
2015
2016 if ((S->getFlags() & Scope::FnScope)) {
2017 // If we're in a function or function template declared in the
2018 // body of a class, then this is a local class rather than a
2019 // nested class.
2020 const Scope *Parent = S->getParent();
2021 if (Parent->isTemplateParamScope())
2022 Parent = Parent->getParent();
2023 if (Parent->isClassScope())
2024 break;
2025 }
2026 }
2027 }
2028
2029 // Enter a scope for the class.
2030 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
2031
2032 // Note that we are parsing a new (potentially-nested) class definition.
2033 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
2034
2035 if (TagDecl)
2036 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
2037
2038 SourceLocation FinalLoc;
2039
2040 // Parse the optional 'final' keyword.
2041 if (getLang().CPlusPlus && Tok.is(tok::identifier)) {
2042 IdentifierInfo *II = Tok.getIdentifierInfo();
2043
2044 // Initialize the contextual keywords.
2045 if (!Ident_final) {
2046 Ident_final = &PP.getIdentifierTable().get("final");
2047 Ident_override = &PP.getIdentifierTable().get("override");
2048 }
2049
2050 if (II == Ident_final)
2051 FinalLoc = ConsumeToken();
2052
2053 if (!getLang().CPlusPlus0x)
2054 Diag(FinalLoc, diag::ext_override_control_keyword) << "final";
2055 }
2056
2057 if (Tok.is(tok::colon)) {
2058 ParseBaseClause(TagDecl);
2059
2060 if (!Tok.is(tok::l_brace)) {
2061 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
2062
2063 if (TagDecl)
2064 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl);
2065 return;
2066 }
2067 }
2068
2069 assert(Tok.is(tok::l_brace));
2070
2071 SourceLocation LBraceLoc = ConsumeBrace();
2072
2073 if (TagDecl)
2074 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc,
2075 LBraceLoc);
2076
2077 // C++ 11p3: Members of a class defined with the keyword class are private
2078 // by default. Members of a class defined with the keywords struct or union
2079 // are public by default.
2080 AccessSpecifier CurAS;
2081 if (TagType == DeclSpec::TST_class)
2082 CurAS = AS_private;
2083 else
2084 CurAS = AS_public;
2085
2086 SourceLocation RBraceLoc;
2087 if (TagDecl) {
2088 // While we still have something to read, read the member-declarations.
2089 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
2090 // Each iteration of this loop reads one member-declaration.
2091
2092 if (getLang().Microsoft && (Tok.is(tok::kw___if_exists) ||
2093 Tok.is(tok::kw___if_not_exists))) {
2094 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2095 continue;
2096 }
2097
2098 // Check for extraneous top-level semicolon.
2099 if (Tok.is(tok::semi)) {
2100 Diag(Tok, diag::ext_extra_struct_semi)
2101 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
2102 << FixItHint::CreateRemoval(Tok.getLocation());
2103 ConsumeToken();
2104 continue;
2105 }
2106
2107 AccessSpecifier AS = getAccessSpecifierIfPresent();
2108 if (AS != AS_none) {
2109 // Current token is a C++ access specifier.
2110 CurAS = AS;
2111 SourceLocation ASLoc = Tok.getLocation();
2112 ConsumeToken();
2113 if (Tok.is(tok::colon))
2114 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
2115 else
2116 Diag(Tok, diag::err_expected_colon);
2117 ConsumeToken();
2118 continue;
2119 }
2120
2121 // FIXME: Make sure we don't have a template here.
2122
2123 // Parse all the comma separated declarators.
2124 ParseCXXClassMemberDeclaration(CurAS);
2125 }
2126
2127 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
2128 } else {
2129 SkipUntil(tok::r_brace, false, false);
2130 }
2131
2132 // If attributes exist after class contents, parse them.
2133 ParsedAttributes attrs(AttrFactory);
2134 MaybeParseGNUAttributes(attrs);
2135
2136 if (TagDecl)
2137 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl,
2138 LBraceLoc, RBraceLoc,
2139 attrs.getList());
2140
2141 // C++0x [class.mem]p2: Within the class member-specification, the class is
2142 // regarded as complete within function bodies, default arguments, exception-
2143 // specifications, and brace-or-equal-initializers for non-static data
2144 // members (including such things in nested classes).
2145 //
2146 // FIXME: Only function bodies and brace-or-equal-initializers are currently
2147 // handled. Fix the others!
2148 if (TagDecl && NonNestedClass) {
2149 // We are not inside a nested class. This class and its nested classes
2150 // are complete and we can parse the delayed portions of method
2151 // declarations and the lexed inline method definitions.
2152 SourceLocation SavedPrevTokLocation = PrevTokLocation;
2153 ParseLexedMethodDeclarations(getCurrentClass());
2154 ParseLexedMemberInitializers(getCurrentClass());
2155 ParseLexedMethodDefs(getCurrentClass());
2156 PrevTokLocation = SavedPrevTokLocation;
2157 }
2158
2159 if (TagDecl)
2160 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc);
2161
2162 // Leave the class scope.
2163 ParsingDef.Pop();
2164 ClassScope.Exit();
2165 }
2166
2167 /// ParseConstructorInitializer - Parse a C++ constructor initializer,
2168 /// which explicitly initializes the members or base classes of a
2169 /// class (C++ [class.base.init]). For example, the three initializers
2170 /// after the ':' in the Derived constructor below:
2171 ///
2172 /// @code
2173 /// class Base { };
2174 /// class Derived : Base {
2175 /// int x;
2176 /// float f;
2177 /// public:
2178 /// Derived(float f) : Base(), x(17), f(f) { }
2179 /// };
2180 /// @endcode
2181 ///
2182 /// [C++] ctor-initializer:
2183 /// ':' mem-initializer-list
2184 ///
2185 /// [C++] mem-initializer-list:
2186 /// mem-initializer ...[opt]
2187 /// mem-initializer ...[opt] , mem-initializer-list
ParseConstructorInitializer(Decl * ConstructorDecl)2188 void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) {
2189 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
2190
2191 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers
2192 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
2193 SourceLocation ColonLoc = ConsumeToken();
2194
2195 llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers;
2196 bool AnyErrors = false;
2197
2198 do {
2199 if (Tok.is(tok::code_completion)) {
2200 Actions.CodeCompleteConstructorInitializer(ConstructorDecl,
2201 MemInitializers.data(),
2202 MemInitializers.size());
2203 ConsumeCodeCompletionToken();
2204 } else {
2205 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
2206 if (!MemInit.isInvalid())
2207 MemInitializers.push_back(MemInit.get());
2208 else
2209 AnyErrors = true;
2210 }
2211
2212 if (Tok.is(tok::comma))
2213 ConsumeToken();
2214 else if (Tok.is(tok::l_brace))
2215 break;
2216 // If the next token looks like a base or member initializer, assume that
2217 // we're just missing a comma.
2218 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) {
2219 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation);
2220 Diag(Loc, diag::err_ctor_init_missing_comma)
2221 << FixItHint::CreateInsertion(Loc, ", ");
2222 } else {
2223 // Skip over garbage, until we get to '{'. Don't eat the '{'.
2224 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
2225 SkipUntil(tok::l_brace, true, true);
2226 break;
2227 }
2228 } while (true);
2229
2230 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
2231 MemInitializers.data(), MemInitializers.size(),
2232 AnyErrors);
2233 }
2234
2235 /// ParseMemInitializer - Parse a C++ member initializer, which is
2236 /// part of a constructor initializer that explicitly initializes one
2237 /// member or base class (C++ [class.base.init]). See
2238 /// ParseConstructorInitializer for an example.
2239 ///
2240 /// [C++] mem-initializer:
2241 /// mem-initializer-id '(' expression-list[opt] ')'
2242 /// [C++0x] mem-initializer-id braced-init-list
2243 ///
2244 /// [C++] mem-initializer-id:
2245 /// '::'[opt] nested-name-specifier[opt] class-name
2246 /// identifier
ParseMemInitializer(Decl * ConstructorDecl)2247 Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) {
2248 // parse '::'[opt] nested-name-specifier[opt]
2249 CXXScopeSpec SS;
2250 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
2251 ParsedType TemplateTypeTy;
2252 if (Tok.is(tok::annot_template_id)) {
2253 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2254 if (TemplateId->Kind == TNK_Type_template ||
2255 TemplateId->Kind == TNK_Dependent_template_name) {
2256 AnnotateTemplateIdTokenAsType();
2257 assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
2258 TemplateTypeTy = getTypeAnnotation(Tok);
2259 }
2260 }
2261 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
2262 Diag(Tok, diag::err_expected_member_or_base_name);
2263 return true;
2264 }
2265
2266 // Get the identifier. This may be a member name or a class name,
2267 // but we'll let the semantic analysis determine which it is.
2268 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
2269 SourceLocation IdLoc = ConsumeToken();
2270
2271 // Parse the '('.
2272 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) {
2273 // FIXME: Do something with the braced-init-list.
2274 ParseBraceInitializer();
2275 return true;
2276 } else if(Tok.is(tok::l_paren)) {
2277 SourceLocation LParenLoc = ConsumeParen();
2278
2279 // Parse the optional expression-list.
2280 ExprVector ArgExprs(Actions);
2281 CommaLocsTy CommaLocs;
2282 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
2283 SkipUntil(tok::r_paren);
2284 return true;
2285 }
2286
2287 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2288
2289 SourceLocation EllipsisLoc;
2290 if (Tok.is(tok::ellipsis))
2291 EllipsisLoc = ConsumeToken();
2292
2293 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II,
2294 TemplateTypeTy, IdLoc,
2295 LParenLoc, ArgExprs.take(),
2296 ArgExprs.size(), RParenLoc,
2297 EllipsisLoc);
2298 }
2299
2300 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace
2301 : diag::err_expected_lparen);
2302 return true;
2303 }
2304
2305 /// \brief Parse a C++ exception-specification if present (C++0x [except.spec]).
2306 ///
2307 /// exception-specification:
2308 /// dynamic-exception-specification
2309 /// noexcept-specification
2310 ///
2311 /// noexcept-specification:
2312 /// 'noexcept'
2313 /// 'noexcept' '(' constant-expression ')'
2314 ExceptionSpecificationType
MaybeParseExceptionSpecification(SourceRange & SpecificationRange,llvm::SmallVectorImpl<ParsedType> & DynamicExceptions,llvm::SmallVectorImpl<SourceRange> & DynamicExceptionRanges,ExprResult & NoexceptExpr)2315 Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange,
2316 llvm::SmallVectorImpl<ParsedType> &DynamicExceptions,
2317 llvm::SmallVectorImpl<SourceRange> &DynamicExceptionRanges,
2318 ExprResult &NoexceptExpr) {
2319 ExceptionSpecificationType Result = EST_None;
2320
2321 // See if there's a dynamic specification.
2322 if (Tok.is(tok::kw_throw)) {
2323 Result = ParseDynamicExceptionSpecification(SpecificationRange,
2324 DynamicExceptions,
2325 DynamicExceptionRanges);
2326 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() &&
2327 "Produced different number of exception types and ranges.");
2328 }
2329
2330 // If there's no noexcept specification, we're done.
2331 if (Tok.isNot(tok::kw_noexcept))
2332 return Result;
2333
2334 // If we already had a dynamic specification, parse the noexcept for,
2335 // recovery, but emit a diagnostic and don't store the results.
2336 SourceRange NoexceptRange;
2337 ExceptionSpecificationType NoexceptType = EST_None;
2338
2339 SourceLocation KeywordLoc = ConsumeToken();
2340 if (Tok.is(tok::l_paren)) {
2341 // There is an argument.
2342 SourceLocation LParenLoc = ConsumeParen();
2343 NoexceptType = EST_ComputedNoexcept;
2344 NoexceptExpr = ParseConstantExpression();
2345 // The argument must be contextually convertible to bool. We use
2346 // ActOnBooleanCondition for this purpose.
2347 if (!NoexceptExpr.isInvalid())
2348 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc,
2349 NoexceptExpr.get());
2350 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2351 NoexceptRange = SourceRange(KeywordLoc, RParenLoc);
2352 } else {
2353 // There is no argument.
2354 NoexceptType = EST_BasicNoexcept;
2355 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc);
2356 }
2357
2358 if (Result == EST_None) {
2359 SpecificationRange = NoexceptRange;
2360 Result = NoexceptType;
2361
2362 // If there's a dynamic specification after a noexcept specification,
2363 // parse that and ignore the results.
2364 if (Tok.is(tok::kw_throw)) {
2365 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2366 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions,
2367 DynamicExceptionRanges);
2368 }
2369 } else {
2370 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification);
2371 }
2372
2373 return Result;
2374 }
2375
2376 /// ParseDynamicExceptionSpecification - Parse a C++
2377 /// dynamic-exception-specification (C++ [except.spec]).
2378 ///
2379 /// dynamic-exception-specification:
2380 /// 'throw' '(' type-id-list [opt] ')'
2381 /// [MS] 'throw' '(' '...' ')'
2382 ///
2383 /// type-id-list:
2384 /// type-id ... [opt]
2385 /// type-id-list ',' type-id ... [opt]
2386 ///
ParseDynamicExceptionSpecification(SourceRange & SpecificationRange,llvm::SmallVectorImpl<ParsedType> & Exceptions,llvm::SmallVectorImpl<SourceRange> & Ranges)2387 ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification(
2388 SourceRange &SpecificationRange,
2389 llvm::SmallVectorImpl<ParsedType> &Exceptions,
2390 llvm::SmallVectorImpl<SourceRange> &Ranges) {
2391 assert(Tok.is(tok::kw_throw) && "expected throw");
2392
2393 SpecificationRange.setBegin(ConsumeToken());
2394
2395 if (!Tok.is(tok::l_paren)) {
2396 Diag(Tok, diag::err_expected_lparen_after) << "throw";
2397 SpecificationRange.setEnd(SpecificationRange.getBegin());
2398 return EST_DynamicNone;
2399 }
2400 SourceLocation LParenLoc = ConsumeParen();
2401
2402 // Parse throw(...), a Microsoft extension that means "this function
2403 // can throw anything".
2404 if (Tok.is(tok::ellipsis)) {
2405 SourceLocation EllipsisLoc = ConsumeToken();
2406 if (!getLang().Microsoft)
2407 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
2408 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
2409 SpecificationRange.setEnd(RParenLoc);
2410 return EST_MSAny;
2411 }
2412
2413 // Parse the sequence of type-ids.
2414 SourceRange Range;
2415 while (Tok.isNot(tok::r_paren)) {
2416 TypeResult Res(ParseTypeName(&Range));
2417
2418 if (Tok.is(tok::ellipsis)) {
2419 // C++0x [temp.variadic]p5:
2420 // - In a dynamic-exception-specification (15.4); the pattern is a
2421 // type-id.
2422 SourceLocation Ellipsis = ConsumeToken();
2423 Range.setEnd(Ellipsis);
2424 if (!Res.isInvalid())
2425 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis);
2426 }
2427
2428 if (!Res.isInvalid()) {
2429 Exceptions.push_back(Res.get());
2430 Ranges.push_back(Range);
2431 }
2432
2433 if (Tok.is(tok::comma))
2434 ConsumeToken();
2435 else
2436 break;
2437 }
2438
2439 SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc));
2440 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic;
2441 }
2442
2443 /// ParseTrailingReturnType - Parse a trailing return type on a new-style
2444 /// function declaration.
ParseTrailingReturnType()2445 TypeResult Parser::ParseTrailingReturnType() {
2446 assert(Tok.is(tok::arrow) && "expected arrow");
2447
2448 ConsumeToken();
2449
2450 // FIXME: Need to suppress declarations when parsing this typename.
2451 // Otherwise in this function definition:
2452 //
2453 // auto f() -> struct X {}
2454 //
2455 // struct X is parsed as class definition because of the trailing
2456 // brace.
2457
2458 SourceRange Range;
2459 return ParseTypeName(&Range);
2460 }
2461
2462 /// \brief We have just started parsing the definition of a new class,
2463 /// so push that class onto our stack of classes that is currently
2464 /// being parsed.
2465 Sema::ParsingClassState
PushParsingClass(Decl * ClassDecl,bool NonNestedClass)2466 Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) {
2467 assert((NonNestedClass || !ClassStack.empty()) &&
2468 "Nested class without outer class");
2469 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
2470 return Actions.PushParsingClass();
2471 }
2472
2473 /// \brief Deallocate the given parsed class and all of its nested
2474 /// classes.
DeallocateParsedClasses(Parser::ParsingClass * Class)2475 void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
2476 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I)
2477 delete Class->LateParsedDeclarations[I];
2478 delete Class;
2479 }
2480
2481 /// \brief Pop the top class of the stack of classes that are
2482 /// currently being parsed.
2483 ///
2484 /// This routine should be called when we have finished parsing the
2485 /// definition of a class, but have not yet popped the Scope
2486 /// associated with the class's definition.
2487 ///
2488 /// \returns true if the class we've popped is a top-level class,
2489 /// false otherwise.
PopParsingClass(Sema::ParsingClassState state)2490 void Parser::PopParsingClass(Sema::ParsingClassState state) {
2491 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
2492
2493 Actions.PopParsingClass(state);
2494
2495 ParsingClass *Victim = ClassStack.top();
2496 ClassStack.pop();
2497 if (Victim->TopLevelClass) {
2498 // Deallocate all of the nested classes of this class,
2499 // recursively: we don't need to keep any of this information.
2500 DeallocateParsedClasses(Victim);
2501 return;
2502 }
2503 assert(!ClassStack.empty() && "Missing top-level class?");
2504
2505 if (Victim->LateParsedDeclarations.empty()) {
2506 // The victim is a nested class, but we will not need to perform
2507 // any processing after the definition of this class since it has
2508 // no members whose handling was delayed. Therefore, we can just
2509 // remove this nested class.
2510 DeallocateParsedClasses(Victim);
2511 return;
2512 }
2513
2514 // This nested class has some members that will need to be processed
2515 // after the top-level class is completely defined. Therefore, add
2516 // it to the list of nested classes within its parent.
2517 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?");
2518 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim));
2519 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope();
2520 }
2521
2522 /// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
2523 /// parses standard attributes.
2524 ///
2525 /// [C++0x] attribute-specifier:
2526 /// '[' '[' attribute-list ']' ']'
2527 ///
2528 /// [C++0x] attribute-list:
2529 /// attribute[opt]
2530 /// attribute-list ',' attribute[opt]
2531 ///
2532 /// [C++0x] attribute:
2533 /// attribute-token attribute-argument-clause[opt]
2534 ///
2535 /// [C++0x] attribute-token:
2536 /// identifier
2537 /// attribute-scoped-token
2538 ///
2539 /// [C++0x] attribute-scoped-token:
2540 /// attribute-namespace '::' identifier
2541 ///
2542 /// [C++0x] attribute-namespace:
2543 /// identifier
2544 ///
2545 /// [C++0x] attribute-argument-clause:
2546 /// '(' balanced-token-seq ')'
2547 ///
2548 /// [C++0x] balanced-token-seq:
2549 /// balanced-token
2550 /// balanced-token-seq balanced-token
2551 ///
2552 /// [C++0x] balanced-token:
2553 /// '(' balanced-token-seq ')'
2554 /// '[' balanced-token-seq ']'
2555 /// '{' balanced-token-seq '}'
2556 /// any token but '(', ')', '[', ']', '{', or '}'
ParseCXX0XAttributes(ParsedAttributesWithRange & attrs,SourceLocation * endLoc)2557 void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs,
2558 SourceLocation *endLoc) {
2559 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
2560 && "Not a C++0x attribute list");
2561
2562 SourceLocation StartLoc = Tok.getLocation(), Loc;
2563
2564 ConsumeBracket();
2565 ConsumeBracket();
2566
2567 if (Tok.is(tok::comma)) {
2568 Diag(Tok.getLocation(), diag::err_expected_ident);
2569 ConsumeToken();
2570 }
2571
2572 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
2573 // attribute not present
2574 if (Tok.is(tok::comma)) {
2575 ConsumeToken();
2576 continue;
2577 }
2578
2579 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
2580 SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
2581
2582 // scoped attribute
2583 if (Tok.is(tok::coloncolon)) {
2584 ConsumeToken();
2585
2586 if (!Tok.is(tok::identifier)) {
2587 Diag(Tok.getLocation(), diag::err_expected_ident);
2588 SkipUntil(tok::r_square, tok::comma, true, true);
2589 continue;
2590 }
2591
2592 ScopeName = AttrName;
2593 ScopeLoc = AttrLoc;
2594
2595 AttrName = Tok.getIdentifierInfo();
2596 AttrLoc = ConsumeToken();
2597 }
2598
2599 bool AttrParsed = false;
2600 // No scoped names are supported; ideally we could put all non-standard
2601 // attributes into namespaces.
2602 if (!ScopeName) {
2603 switch(AttributeList::getKind(AttrName))
2604 {
2605 // No arguments
2606 case AttributeList::AT_carries_dependency:
2607 case AttributeList::AT_noreturn: {
2608 if (Tok.is(tok::l_paren)) {
2609 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
2610 << AttrName->getName();
2611 break;
2612 }
2613
2614 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0,
2615 SourceLocation(), 0, 0, false, true);
2616 AttrParsed = true;
2617 break;
2618 }
2619
2620 // One argument; must be a type-id or assignment-expression
2621 case AttributeList::AT_aligned: {
2622 if (Tok.isNot(tok::l_paren)) {
2623 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
2624 << AttrName->getName();
2625 break;
2626 }
2627 SourceLocation ParamLoc = ConsumeParen();
2628
2629 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
2630
2631 MatchRHSPunctuation(tok::r_paren, ParamLoc);
2632
2633 ExprVector ArgExprs(Actions);
2634 ArgExprs.push_back(ArgExpr.release());
2635 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc,
2636 0, ParamLoc, ArgExprs.take(), 1,
2637 false, true);
2638
2639 AttrParsed = true;
2640 break;
2641 }
2642
2643 // Silence warnings
2644 default: break;
2645 }
2646 }
2647
2648 // Skip the entire parameter clause, if any
2649 if (!AttrParsed && Tok.is(tok::l_paren)) {
2650 ConsumeParen();
2651 // SkipUntil maintains the balancedness of tokens.
2652 SkipUntil(tok::r_paren, false);
2653 }
2654 }
2655
2656 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2657 SkipUntil(tok::r_square, false);
2658 Loc = Tok.getLocation();
2659 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
2660 SkipUntil(tok::r_square, false);
2661
2662 attrs.Range = SourceRange(StartLoc, Loc);
2663 }
2664
2665 /// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
2666 /// attribute.
2667 ///
2668 /// FIXME: Simply returns an alignof() expression if the argument is a
2669 /// type. Ideally, the type should be propagated directly into Sema.
2670 ///
2671 /// [C++0x] 'align' '(' type-id ')'
2672 /// [C++0x] 'align' '(' assignment-expression ')'
ParseCXX0XAlignArgument(SourceLocation Start)2673 ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
2674 if (isTypeIdInParens()) {
2675 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
2676 SourceLocation TypeLoc = Tok.getLocation();
2677 ParsedType Ty = ParseTypeName().get();
2678 SourceRange TypeRange(Start, Tok.getLocation());
2679 return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true,
2680 Ty.getAsOpaquePtr(), TypeRange);
2681 } else
2682 return ParseConstantExpression();
2683 }
2684
2685 /// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr]
2686 ///
2687 /// [MS] ms-attribute:
2688 /// '[' token-seq ']'
2689 ///
2690 /// [MS] ms-attribute-seq:
2691 /// ms-attribute[opt]
2692 /// ms-attribute ms-attribute-seq
ParseMicrosoftAttributes(ParsedAttributes & attrs,SourceLocation * endLoc)2693 void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs,
2694 SourceLocation *endLoc) {
2695 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list");
2696
2697 while (Tok.is(tok::l_square)) {
2698 ConsumeBracket();
2699 SkipUntil(tok::r_square, true, true);
2700 if (endLoc) *endLoc = Tok.getLocation();
2701 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare);
2702 }
2703 }
2704
ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,AccessSpecifier & CurAS)2705 void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType,
2706 AccessSpecifier& CurAS) {
2707 bool Result;
2708 if (ParseMicrosoftIfExistsCondition(Result))
2709 return;
2710
2711 if (Tok.isNot(tok::l_brace)) {
2712 Diag(Tok, diag::err_expected_lbrace);
2713 return;
2714 }
2715 ConsumeBrace();
2716
2717 // Condition is false skip all inside the {}.
2718 if (!Result) {
2719 SkipUntil(tok::r_brace, false);
2720 return;
2721 }
2722
2723 // Condition is true, parse the declaration.
2724 while (Tok.isNot(tok::r_brace)) {
2725
2726 // __if_exists, __if_not_exists can nest.
2727 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) {
2728 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS);
2729 continue;
2730 }
2731
2732 // Check for extraneous top-level semicolon.
2733 if (Tok.is(tok::semi)) {
2734 Diag(Tok, diag::ext_extra_struct_semi)
2735 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType)
2736 << FixItHint::CreateRemoval(Tok.getLocation());
2737 ConsumeToken();
2738 continue;
2739 }
2740
2741 AccessSpecifier AS = getAccessSpecifierIfPresent();
2742 if (AS != AS_none) {
2743 // Current token is a C++ access specifier.
2744 CurAS = AS;
2745 SourceLocation ASLoc = Tok.getLocation();
2746 ConsumeToken();
2747 if (Tok.is(tok::colon))
2748 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation());
2749 else
2750 Diag(Tok, diag::err_expected_colon);
2751 ConsumeToken();
2752 continue;
2753 }
2754
2755 // Parse all the comma separated declarators.
2756 ParseCXXClassMemberDeclaration(CurAS);
2757 }
2758
2759 if (Tok.isNot(tok::r_brace)) {
2760 Diag(Tok, diag::err_expected_rbrace);
2761 return;
2762 }
2763 ConsumeBrace();
2764 }
2765