ParseDeclCXX.cpp revision 9a34edb710917798aa30263374f624f13b594605
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" 22using 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/// 50Decl *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 64 Token attrTok; 65 66 if (Tok.is(tok::identifier)) { 67 Ident = Tok.getIdentifierInfo(); 68 IdentLoc = ConsumeToken(); // eat the identifier. 69 } 70 71 // Read label attributes, if present. 72 llvm::OwningPtr<AttributeList> AttrList; 73 if (Tok.is(tok::kw___attribute)) { 74 attrTok = Tok; 75 76 // FIXME: save these somewhere. 77 AttrList.reset(ParseGNUAttributes()); 78 } 79 80 if (Tok.is(tok::equal)) { 81 if (AttrList) 82 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 83 if (InlineLoc.isValid()) 84 Diag(InlineLoc, diag::err_inline_namespace_alias) 85 << FixItHint::CreateRemoval(InlineLoc); 86 87 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 88 } 89 90 if (Tok.isNot(tok::l_brace)) { 91 Diag(Tok, Ident ? diag::err_expected_lbrace : 92 diag::err_expected_ident_lbrace); 93 return 0; 94 } 95 96 SourceLocation LBrace = ConsumeBrace(); 97 98 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 99 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 100 getCurScope()->getFnParent()) { 101 Diag(LBrace, diag::err_namespace_nonnamespace_scope); 102 SkipUntil(tok::r_brace, false); 103 return 0; 104 } 105 106 // If we're still good, complain about inline namespaces in non-C++0x now. 107 if (!getLang().CPlusPlus0x && InlineLoc.isValid()) 108 Diag(InlineLoc, diag::ext_inline_namespace); 109 110 // Enter a scope for the namespace. 111 ParseScope NamespaceScope(this, Scope::DeclScope); 112 113 Decl *NamespcDecl = 114 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, IdentLoc, Ident, 115 LBrace, AttrList.get()); 116 117 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 118 "parsing namespace"); 119 120 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 121 CXX0XAttributeList Attr; 122 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 123 Attr = ParseCXX0XAttributes(); 124 if (getLang().Microsoft && Tok.is(tok::l_square)) 125 ParseMicrosoftAttributes(); 126 ParseExternalDeclaration(Attr); 127 } 128 129 // Leave the namespace scope. 130 NamespaceScope.Exit(); 131 132 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 133 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 134 135 DeclEnd = RBraceLoc; 136 return NamespcDecl; 137} 138 139/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 140/// alias definition. 141/// 142Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 143 SourceLocation AliasLoc, 144 IdentifierInfo *Alias, 145 SourceLocation &DeclEnd) { 146 assert(Tok.is(tok::equal) && "Not equal token"); 147 148 ConsumeToken(); // eat the '='. 149 150 if (Tok.is(tok::code_completion)) { 151 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 152 ConsumeCodeCompletionToken(); 153 } 154 155 CXXScopeSpec SS; 156 // Parse (optional) nested-name-specifier. 157 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 158 159 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 160 Diag(Tok, diag::err_expected_namespace_name); 161 // Skip to end of the definition and eat the ';'. 162 SkipUntil(tok::semi); 163 return 0; 164 } 165 166 // Parse identifier. 167 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 168 SourceLocation IdentLoc = ConsumeToken(); 169 170 // Eat the ';'. 171 DeclEnd = Tok.getLocation(); 172 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 173 "", tok::semi); 174 175 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 176 SS, IdentLoc, Ident); 177} 178 179/// ParseLinkage - We know that the current token is a string_literal 180/// and just before that, that extern was seen. 181/// 182/// linkage-specification: [C++ 7.5p2: dcl.link] 183/// 'extern' string-literal '{' declaration-seq[opt] '}' 184/// 'extern' string-literal declaration 185/// 186Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, 187 unsigned Context) { 188 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 189 llvm::SmallString<8> LangBuffer; 190 // LangBuffer is guaranteed to be big enough. 191 bool Invalid = false; 192 llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 193 if (Invalid) 194 return 0; 195 196 SourceLocation Loc = ConsumeStringToken(); 197 198 ParseScope LinkageScope(this, Scope::DeclScope); 199 Decl *LinkageSpec 200 = Actions.ActOnStartLinkageSpecification(getCurScope(), 201 /*FIXME: */SourceLocation(), 202 Loc, Lang, 203 Tok.is(tok::l_brace)? Tok.getLocation() 204 : SourceLocation()); 205 206 CXX0XAttributeList Attr; 207 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) { 208 Attr = ParseCXX0XAttributes(); 209 } 210 if (getLang().Microsoft && Tok.is(tok::l_square)) 211 ParseMicrosoftAttributes(); 212 213 if (Tok.isNot(tok::l_brace)) { 214 DS.setExternInLinkageSpec(true); 215 ParseExternalDeclaration(Attr, &DS); 216 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 217 SourceLocation()); 218 } 219 220 DS.abort(); 221 222 if (Attr.HasAttr) 223 Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 224 << Attr.Range; 225 226 SourceLocation LBrace = ConsumeBrace(); 227 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 228 CXX0XAttributeList Attr; 229 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 230 Attr = ParseCXX0XAttributes(); 231 if (getLang().Microsoft && Tok.is(tok::l_square)) 232 ParseMicrosoftAttributes(); 233 ParseExternalDeclaration(Attr); 234 } 235 236 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 237 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, RBrace); 238} 239 240/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 241/// using-directive. Assumes that current token is 'using'. 242Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 243 SourceLocation &DeclEnd, 244 CXX0XAttributeList Attr) { 245 assert(Tok.is(tok::kw_using) && "Not using token"); 246 247 // Eat 'using'. 248 SourceLocation UsingLoc = ConsumeToken(); 249 250 if (Tok.is(tok::code_completion)) { 251 Actions.CodeCompleteUsing(getCurScope()); 252 ConsumeCodeCompletionToken(); 253 } 254 255 if (Tok.is(tok::kw_namespace)) 256 // Next token after 'using' is 'namespace' so it must be using-directive 257 return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList); 258 259 if (Attr.HasAttr) 260 Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 261 << Attr.Range; 262 263 // Otherwise, it must be using-declaration. 264 // Ignore illegal attributes (the caller should already have issued an error. 265 return ParseUsingDeclaration(Context, UsingLoc, DeclEnd); 266} 267 268/// ParseUsingDirective - Parse C++ using-directive, assumes 269/// that current token is 'namespace' and 'using' was already parsed. 270/// 271/// using-directive: [C++ 7.3.p4: namespace.udir] 272/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 273/// namespace-name ; 274/// [GNU] using-directive: 275/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 276/// namespace-name attributes[opt] ; 277/// 278Decl *Parser::ParseUsingDirective(unsigned Context, 279 SourceLocation UsingLoc, 280 SourceLocation &DeclEnd, 281 AttributeList *Attr) { 282 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 283 284 // Eat 'namespace'. 285 SourceLocation NamespcLoc = ConsumeToken(); 286 287 if (Tok.is(tok::code_completion)) { 288 Actions.CodeCompleteUsingDirective(getCurScope()); 289 ConsumeCodeCompletionToken(); 290 } 291 292 CXXScopeSpec SS; 293 // Parse (optional) nested-name-specifier. 294 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 295 296 IdentifierInfo *NamespcName = 0; 297 SourceLocation IdentLoc = SourceLocation(); 298 299 // Parse namespace-name. 300 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 301 Diag(Tok, diag::err_expected_namespace_name); 302 // If there was invalid namespace name, skip to end of decl, and eat ';'. 303 SkipUntil(tok::semi); 304 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 305 return 0; 306 } 307 308 // Parse identifier. 309 NamespcName = Tok.getIdentifierInfo(); 310 IdentLoc = ConsumeToken(); 311 312 // Parse (optional) attributes (most likely GNU strong-using extension). 313 bool GNUAttr = false; 314 if (Tok.is(tok::kw___attribute)) { 315 GNUAttr = true; 316 Attr = addAttributeLists(Attr, ParseGNUAttributes()); 317 } 318 319 // Eat ';'. 320 DeclEnd = Tok.getLocation(); 321 ExpectAndConsume(tok::semi, 322 GNUAttr ? diag::err_expected_semi_after_attribute_list 323 : diag::err_expected_semi_after_namespace_name, 324 "", tok::semi); 325 326 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 327 IdentLoc, NamespcName, Attr); 328} 329 330/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that 331/// 'using' was already seen. 332/// 333/// using-declaration: [C++ 7.3.p3: namespace.udecl] 334/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 335/// unqualified-id 336/// 'using' :: unqualified-id 337/// 338Decl *Parser::ParseUsingDeclaration(unsigned Context, 339 SourceLocation UsingLoc, 340 SourceLocation &DeclEnd, 341 AccessSpecifier AS) { 342 CXXScopeSpec SS; 343 SourceLocation TypenameLoc; 344 bool IsTypeName; 345 346 // Ignore optional 'typename'. 347 // FIXME: This is wrong; we should parse this as a typename-specifier. 348 if (Tok.is(tok::kw_typename)) { 349 TypenameLoc = Tok.getLocation(); 350 ConsumeToken(); 351 IsTypeName = true; 352 } 353 else 354 IsTypeName = false; 355 356 // Parse nested-name-specifier. 357 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 358 359 // Check nested-name specifier. 360 if (SS.isInvalid()) { 361 SkipUntil(tok::semi); 362 return 0; 363 } 364 365 // Parse the unqualified-id. We allow parsing of both constructor and 366 // destructor names and allow the action module to diagnose any semantic 367 // errors. 368 UnqualifiedId Name; 369 if (ParseUnqualifiedId(SS, 370 /*EnteringContext=*/false, 371 /*AllowDestructorName=*/true, 372 /*AllowConstructorName=*/true, 373 ParsedType(), 374 Name)) { 375 SkipUntil(tok::semi); 376 return 0; 377 } 378 379 // Parse (optional) attributes (most likely GNU strong-using extension). 380 llvm::OwningPtr<AttributeList> AttrList; 381 if (Tok.is(tok::kw___attribute)) 382 AttrList.reset(ParseGNUAttributes()); 383 384 // Eat ';'. 385 DeclEnd = Tok.getLocation(); 386 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 387 AttrList ? "attributes list" : "using declaration", 388 tok::semi); 389 390 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, Name, 391 AttrList.get(), IsTypeName, TypenameLoc); 392} 393 394/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion. 395/// 396/// static_assert-declaration: 397/// static_assert ( constant-expression , string-literal ) ; 398/// 399Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 400 assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration"); 401 SourceLocation StaticAssertLoc = ConsumeToken(); 402 403 if (Tok.isNot(tok::l_paren)) { 404 Diag(Tok, diag::err_expected_lparen); 405 return 0; 406 } 407 408 SourceLocation LParenLoc = ConsumeParen(); 409 410 ExprResult AssertExpr(ParseConstantExpression()); 411 if (AssertExpr.isInvalid()) { 412 SkipUntil(tok::semi); 413 return 0; 414 } 415 416 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 417 return 0; 418 419 if (Tok.isNot(tok::string_literal)) { 420 Diag(Tok, diag::err_expected_string_literal); 421 SkipUntil(tok::semi); 422 return 0; 423 } 424 425 ExprResult AssertMessage(ParseStringLiteralExpression()); 426 if (AssertMessage.isInvalid()) 427 return 0; 428 429 MatchRHSPunctuation(tok::r_paren, LParenLoc); 430 431 DeclEnd = Tok.getLocation(); 432 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 433 434 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 435 AssertExpr.take(), 436 AssertMessage.take()); 437} 438 439/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 440/// 441/// 'decltype' ( expression ) 442/// 443void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 444 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 445 446 SourceLocation StartLoc = ConsumeToken(); 447 SourceLocation LParenLoc = Tok.getLocation(); 448 449 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 450 "decltype")) { 451 SkipUntil(tok::r_paren); 452 return; 453 } 454 455 // Parse the expression 456 457 // C++0x [dcl.type.simple]p4: 458 // The operand of the decltype specifier is an unevaluated operand. 459 EnterExpressionEvaluationContext Unevaluated(Actions, 460 Sema::Unevaluated); 461 ExprResult Result = ParseExpression(); 462 if (Result.isInvalid()) { 463 SkipUntil(tok::r_paren); 464 return; 465 } 466 467 // Match the ')' 468 SourceLocation RParenLoc; 469 if (Tok.is(tok::r_paren)) 470 RParenLoc = ConsumeParen(); 471 else 472 MatchRHSPunctuation(tok::r_paren, LParenLoc); 473 474 if (RParenLoc.isInvalid()) 475 return; 476 477 const char *PrevSpec = 0; 478 unsigned DiagID; 479 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 480 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 481 DiagID, Result.release())) 482 Diag(StartLoc, DiagID) << PrevSpec; 483} 484 485/// ParseClassName - Parse a C++ class-name, which names a class. Note 486/// that we only check that the result names a type; semantic analysis 487/// will need to verify that the type names a class. The result is 488/// either a type or NULL, depending on whether a type name was 489/// found. 490/// 491/// class-name: [C++ 9.1] 492/// identifier 493/// simple-template-id 494/// 495Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 496 CXXScopeSpec *SS) { 497 // Check whether we have a template-id that names a type. 498 if (Tok.is(tok::annot_template_id)) { 499 TemplateIdAnnotation *TemplateId 500 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 501 if (TemplateId->Kind == TNK_Type_template || 502 TemplateId->Kind == TNK_Dependent_template_name) { 503 AnnotateTemplateIdTokenAsType(SS); 504 505 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 506 ParsedType Type = getTypeAnnotation(Tok); 507 EndLocation = Tok.getAnnotationEndLoc(); 508 ConsumeToken(); 509 510 if (Type) 511 return Type; 512 return true; 513 } 514 515 // Fall through to produce an error below. 516 } 517 518 if (Tok.isNot(tok::identifier)) { 519 Diag(Tok, diag::err_expected_class_name); 520 return true; 521 } 522 523 IdentifierInfo *Id = Tok.getIdentifierInfo(); 524 SourceLocation IdLoc = ConsumeToken(); 525 526 if (Tok.is(tok::less)) { 527 // It looks the user intended to write a template-id here, but the 528 // template-name was wrong. Try to fix that. 529 TemplateNameKind TNK = TNK_Type_template; 530 TemplateTy Template; 531 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 532 SS, Template, TNK)) { 533 Diag(IdLoc, diag::err_unknown_template_name) 534 << Id; 535 } 536 537 if (!Template) 538 return true; 539 540 // Form the template name 541 UnqualifiedId TemplateName; 542 TemplateName.setIdentifier(Id, IdLoc); 543 544 // Parse the full template-id, then turn it into a type. 545 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 546 SourceLocation(), true)) 547 return true; 548 if (TNK == TNK_Dependent_template_name) 549 AnnotateTemplateIdTokenAsType(SS); 550 551 // If we didn't end up with a typename token, there's nothing more we 552 // can do. 553 if (Tok.isNot(tok::annot_typename)) 554 return true; 555 556 // Retrieve the type from the annotation token, consume that token, and 557 // return. 558 EndLocation = Tok.getAnnotationEndLoc(); 559 ParsedType Type = getTypeAnnotation(Tok); 560 ConsumeToken(); 561 return Type; 562 } 563 564 // We have an identifier; check whether it is actually a type. 565 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), SS, true); 566 if (!Type) { 567 Diag(IdLoc, diag::err_expected_class_name); 568 return true; 569 } 570 571 // Consume the identifier. 572 EndLocation = IdLoc; 573 574 // Fake up a Declarator to use with ActOnTypeName. 575 DeclSpec DS; 576 DS.SetRangeStart(IdLoc); 577 DS.SetRangeEnd(EndLocation); 578 DS.getTypeSpecScope() = *SS; 579 580 const char *PrevSpec = 0; 581 unsigned DiagID; 582 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 583 584 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 585 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 586} 587 588/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 589/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 590/// until we reach the start of a definition or see a token that 591/// cannot start a definition. If SuppressDeclarations is true, we do know. 592/// 593/// class-specifier: [C++ class] 594/// class-head '{' member-specification[opt] '}' 595/// class-head '{' member-specification[opt] '}' attributes[opt] 596/// class-head: 597/// class-key identifier[opt] base-clause[opt] 598/// class-key nested-name-specifier identifier base-clause[opt] 599/// class-key nested-name-specifier[opt] simple-template-id 600/// base-clause[opt] 601/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 602/// [GNU] class-key attributes[opt] nested-name-specifier 603/// identifier base-clause[opt] 604/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 605/// simple-template-id base-clause[opt] 606/// class-key: 607/// 'class' 608/// 'struct' 609/// 'union' 610/// 611/// elaborated-type-specifier: [C++ dcl.type.elab] 612/// class-key ::[opt] nested-name-specifier[opt] identifier 613/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 614/// simple-template-id 615/// 616/// Note that the C++ class-specifier and elaborated-type-specifier, 617/// together, subsume the C99 struct-or-union-specifier: 618/// 619/// struct-or-union-specifier: [C99 6.7.2.1] 620/// struct-or-union identifier[opt] '{' struct-contents '}' 621/// struct-or-union identifier 622/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 623/// '}' attributes[opt] 624/// [GNU] struct-or-union attributes[opt] identifier 625/// struct-or-union: 626/// 'struct' 627/// 'union' 628void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 629 SourceLocation StartLoc, DeclSpec &DS, 630 const ParsedTemplateInfo &TemplateInfo, 631 AccessSpecifier AS, bool SuppressDeclarations){ 632 DeclSpec::TST TagType; 633 if (TagTokKind == tok::kw_struct) 634 TagType = DeclSpec::TST_struct; 635 else if (TagTokKind == tok::kw_class) 636 TagType = DeclSpec::TST_class; 637 else { 638 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 639 TagType = DeclSpec::TST_union; 640 } 641 642 if (Tok.is(tok::code_completion)) { 643 // Code completion for a struct, class, or union name. 644 Actions.CodeCompleteTag(getCurScope(), TagType); 645 ConsumeCodeCompletionToken(); 646 } 647 648 // C++03 [temp.explicit] 14.7.2/8: 649 // The usual access checking rules do not apply to names used to specify 650 // explicit instantiations. 651 // 652 // As an extension we do not perform access checking on the names used to 653 // specify explicit specializations either. This is important to allow 654 // specializing traits classes for private types. 655 bool SuppressingAccessChecks = false; 656 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 657 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 658 Actions.ActOnStartSuppressingAccessChecks(); 659 SuppressingAccessChecks = true; 660 } 661 662 AttributeList *AttrList = 0; 663 // If attributes exist after tag, parse them. 664 if (Tok.is(tok::kw___attribute)) 665 AttrList = ParseGNUAttributes(); 666 667 // If declspecs exist after tag, parse them. 668 while (Tok.is(tok::kw___declspec)) 669 AttrList = ParseMicrosoftDeclSpec(AttrList); 670 671 // If C++0x attributes exist here, parse them. 672 // FIXME: Are we consistent with the ordering of parsing of different 673 // styles of attributes? 674 if (isCXX0XAttributeSpecifier()) 675 AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList); 676 677 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) { 678 // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but 679 // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the 680 // token sequence "struct __is_pod", make __is_pod into a normal 681 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 682 // properly. 683 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 684 Tok.setKind(tok::identifier); 685 } 686 687 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) { 688 // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but 689 // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the 690 // token sequence "struct __is_empty", make __is_empty into a normal 691 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 692 // properly. 693 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 694 Tok.setKind(tok::identifier); 695 } 696 697 // Parse the (optional) nested-name-specifier. 698 CXXScopeSpec &SS = DS.getTypeSpecScope(); 699 if (getLang().CPlusPlus) { 700 // "FOO : BAR" is not a potential typo for "FOO::BAR". 701 ColonProtectionRAIIObject X(*this); 702 703 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 704 DS.SetTypeSpecError(); 705 if (SS.isSet()) 706 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 707 Diag(Tok, diag::err_expected_ident); 708 } 709 710 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 711 712 // Parse the (optional) class name or simple-template-id. 713 IdentifierInfo *Name = 0; 714 SourceLocation NameLoc; 715 TemplateIdAnnotation *TemplateId = 0; 716 if (Tok.is(tok::identifier)) { 717 Name = Tok.getIdentifierInfo(); 718 NameLoc = ConsumeToken(); 719 720 if (Tok.is(tok::less) && getLang().CPlusPlus) { 721 // The name was supposed to refer to a template, but didn't. 722 // Eat the template argument list and try to continue parsing this as 723 // a class (or template thereof). 724 TemplateArgList TemplateArgs; 725 SourceLocation LAngleLoc, RAngleLoc; 726 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS, 727 true, LAngleLoc, 728 TemplateArgs, RAngleLoc)) { 729 // We couldn't parse the template argument list at all, so don't 730 // try to give any location information for the list. 731 LAngleLoc = RAngleLoc = SourceLocation(); 732 } 733 734 Diag(NameLoc, diag::err_explicit_spec_non_template) 735 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 736 << (TagType == DeclSpec::TST_class? 0 737 : TagType == DeclSpec::TST_struct? 1 738 : 2) 739 << Name 740 << SourceRange(LAngleLoc, RAngleLoc); 741 742 // Strip off the last template parameter list if it was empty, since 743 // we've removed its template argument list. 744 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 745 if (TemplateParams && TemplateParams->size() > 1) { 746 TemplateParams->pop_back(); 747 } else { 748 TemplateParams = 0; 749 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 750 = ParsedTemplateInfo::NonTemplate; 751 } 752 } else if (TemplateInfo.Kind 753 == ParsedTemplateInfo::ExplicitInstantiation) { 754 // Pretend this is just a forward declaration. 755 TemplateParams = 0; 756 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 757 = ParsedTemplateInfo::NonTemplate; 758 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 759 = SourceLocation(); 760 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 761 = SourceLocation(); 762 } 763 } 764 } else if (Tok.is(tok::annot_template_id)) { 765 TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 766 NameLoc = ConsumeToken(); 767 768 if (TemplateId->Kind != TNK_Type_template) { 769 // The template-name in the simple-template-id refers to 770 // something other than a class template. Give an appropriate 771 // error message and skip to the ';'. 772 SourceRange Range(NameLoc); 773 if (SS.isNotEmpty()) 774 Range.setBegin(SS.getBeginLoc()); 775 776 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 777 << Name << static_cast<int>(TemplateId->Kind) << Range; 778 779 DS.SetTypeSpecError(); 780 SkipUntil(tok::semi, false, true); 781 TemplateId->Destroy(); 782 if (SuppressingAccessChecks) 783 Actions.ActOnStopSuppressingAccessChecks(); 784 785 return; 786 } 787 } 788 789 // As soon as we're finished parsing the class's template-id, turn access 790 // checking back on. 791 if (SuppressingAccessChecks) 792 Actions.ActOnStopSuppressingAccessChecks(); 793 794 // There are four options here. If we have 'struct foo;', then this 795 // is either a forward declaration or a friend declaration, which 796 // have to be treated differently. If we have 'struct foo {...' or 797 // 'struct foo :...' then this is a definition. Otherwise we have 798 // something like 'struct foo xyz', a reference. 799 // However, in some contexts, things look like declarations but are just 800 // references, e.g. 801 // new struct s; 802 // or 803 // &T::operator struct s; 804 // For these, SuppressDeclarations is true. 805 Sema::TagUseKind TUK; 806 if (SuppressDeclarations) 807 TUK = Sema::TUK_Reference; 808 else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){ 809 if (DS.isFriendSpecified()) { 810 // C++ [class.friend]p2: 811 // A class shall not be defined in a friend declaration. 812 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 813 << SourceRange(DS.getFriendSpecLoc()); 814 815 // Skip everything up to the semicolon, so that this looks like a proper 816 // friend class (or template thereof) declaration. 817 SkipUntil(tok::semi, true, true); 818 TUK = Sema::TUK_Friend; 819 } else { 820 // Okay, this is a class definition. 821 TUK = Sema::TUK_Definition; 822 } 823 } else if (Tok.is(tok::semi)) 824 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 825 else 826 TUK = Sema::TUK_Reference; 827 828 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 829 TUK != Sema::TUK_Definition)) { 830 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 831 // We have a declaration or reference to an anonymous class. 832 Diag(StartLoc, diag::err_anon_type_definition) 833 << DeclSpec::getSpecifierName(TagType); 834 } 835 836 SkipUntil(tok::comma, true); 837 838 if (TemplateId) 839 TemplateId->Destroy(); 840 return; 841 } 842 843 // Create the tag portion of the class or class template. 844 DeclResult TagOrTempResult = true; // invalid 845 TypeResult TypeResult = true; // invalid 846 847 bool Owned = false; 848 if (TemplateId) { 849 // Explicit specialization, class template partial specialization, 850 // or explicit instantiation. 851 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 852 TemplateId->getTemplateArgs(), 853 TemplateId->NumArgs); 854 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 855 TUK == Sema::TUK_Declaration) { 856 // This is an explicit instantiation of a class template. 857 TagOrTempResult 858 = Actions.ActOnExplicitInstantiation(getCurScope(), 859 TemplateInfo.ExternLoc, 860 TemplateInfo.TemplateLoc, 861 TagType, 862 StartLoc, 863 SS, 864 TemplateId->Template, 865 TemplateId->TemplateNameLoc, 866 TemplateId->LAngleLoc, 867 TemplateArgsPtr, 868 TemplateId->RAngleLoc, 869 AttrList); 870 871 // Friend template-ids are treated as references unless 872 // they have template headers, in which case they're ill-formed 873 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 874 // We diagnose this error in ActOnClassTemplateSpecialization. 875 } else if (TUK == Sema::TUK_Reference || 876 (TUK == Sema::TUK_Friend && 877 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 878 TypeResult 879 = Actions.ActOnTemplateIdType(TemplateId->Template, 880 TemplateId->TemplateNameLoc, 881 TemplateId->LAngleLoc, 882 TemplateArgsPtr, 883 TemplateId->RAngleLoc); 884 885 TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK, 886 TagType, StartLoc); 887 } else { 888 // This is an explicit specialization or a class template 889 // partial specialization. 890 TemplateParameterLists FakedParamLists; 891 892 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 893 // This looks like an explicit instantiation, because we have 894 // something like 895 // 896 // template class Foo<X> 897 // 898 // but it actually has a definition. Most likely, this was 899 // meant to be an explicit specialization, but the user forgot 900 // the '<>' after 'template'. 901 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 902 903 SourceLocation LAngleLoc 904 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 905 Diag(TemplateId->TemplateNameLoc, 906 diag::err_explicit_instantiation_with_definition) 907 << SourceRange(TemplateInfo.TemplateLoc) 908 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 909 910 // Create a fake template parameter list that contains only 911 // "template<>", so that we treat this construct as a class 912 // template specialization. 913 FakedParamLists.push_back( 914 Actions.ActOnTemplateParameterList(0, SourceLocation(), 915 TemplateInfo.TemplateLoc, 916 LAngleLoc, 917 0, 0, 918 LAngleLoc)); 919 TemplateParams = &FakedParamLists; 920 } 921 922 // Build the class template specialization. 923 TagOrTempResult 924 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 925 StartLoc, SS, 926 TemplateId->Template, 927 TemplateId->TemplateNameLoc, 928 TemplateId->LAngleLoc, 929 TemplateArgsPtr, 930 TemplateId->RAngleLoc, 931 AttrList, 932 MultiTemplateParamsArg(Actions, 933 TemplateParams? &(*TemplateParams)[0] : 0, 934 TemplateParams? TemplateParams->size() : 0)); 935 } 936 TemplateId->Destroy(); 937 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 938 TUK == Sema::TUK_Declaration) { 939 // Explicit instantiation of a member of a class template 940 // specialization, e.g., 941 // 942 // template struct Outer<int>::Inner; 943 // 944 TagOrTempResult 945 = Actions.ActOnExplicitInstantiation(getCurScope(), 946 TemplateInfo.ExternLoc, 947 TemplateInfo.TemplateLoc, 948 TagType, StartLoc, SS, Name, 949 NameLoc, AttrList); 950 } else if (TUK == Sema::TUK_Friend && 951 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 952 TagOrTempResult = 953 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 954 TagType, StartLoc, SS, 955 Name, NameLoc, AttrList, 956 MultiTemplateParamsArg(Actions, 957 TemplateParams? &(*TemplateParams)[0] : 0, 958 TemplateParams? TemplateParams->size() : 0)); 959 } else { 960 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 961 TUK == Sema::TUK_Definition) { 962 // FIXME: Diagnose this particular error. 963 } 964 965 bool IsDependent = false; 966 967 // Declaration or definition of a class type 968 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 969 SS, Name, NameLoc, AttrList, AS, 970 MultiTemplateParamsArg(Actions, 971 TemplateParams? &(*TemplateParams)[0] : 0, 972 TemplateParams? TemplateParams->size() : 0), 973 Owned, IsDependent, false, 974 clang::TypeResult()); 975 976 // If ActOnTag said the type was dependent, try again with the 977 // less common call. 978 if (IsDependent) { 979 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 980 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 981 SS, Name, StartLoc, NameLoc); 982 } 983 } 984 985 // If there is a body, parse it and inform the actions module. 986 if (TUK == Sema::TUK_Definition) { 987 assert(Tok.is(tok::l_brace) || 988 (getLang().CPlusPlus && Tok.is(tok::colon))); 989 if (getLang().CPlusPlus) 990 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 991 else 992 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 993 } 994 995 // FIXME: The DeclSpec should keep the locations of both the keyword and the 996 // name (if there is one). 997 SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc; 998 999 const char *PrevSpec = 0; 1000 unsigned DiagID; 1001 bool Result; 1002 if (!TypeResult.isInvalid()) { 1003 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, TSTLoc, 1004 PrevSpec, DiagID, TypeResult.get()); 1005 } else if (!TagOrTempResult.isInvalid()) { 1006 Result = DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID, 1007 TagOrTempResult.get(), Owned); 1008 } else { 1009 DS.SetTypeSpecError(); 1010 return; 1011 } 1012 1013 if (Result) 1014 Diag(StartLoc, DiagID) << PrevSpec; 1015 1016 // At this point, we've successfully parsed a class-specifier in 'definition' 1017 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1018 // going to look at what comes after it to improve error recovery. If an 1019 // impossible token occurs next, we assume that the programmer forgot a ; at 1020 // the end of the declaration and recover that way. 1021 // 1022 // This switch enumerates the valid "follow" set for definition. 1023 if (TUK == Sema::TUK_Definition) { 1024 bool ExpectedSemi = true; 1025 switch (Tok.getKind()) { 1026 default: break; 1027 case tok::semi: // struct foo {...} ; 1028 case tok::star: // struct foo {...} * P; 1029 case tok::amp: // struct foo {...} & R = ... 1030 case tok::identifier: // struct foo {...} V ; 1031 case tok::r_paren: //(struct foo {...} ) {4} 1032 case tok::annot_cxxscope: // struct foo {...} a:: b; 1033 case tok::annot_typename: // struct foo {...} a ::b; 1034 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1035 case tok::l_paren: // struct foo {...} ( x); 1036 case tok::comma: // __builtin_offsetof(struct foo{...} , 1037 ExpectedSemi = false; 1038 break; 1039 // Type qualifiers 1040 case tok::kw_const: // struct foo {...} const x; 1041 case tok::kw_volatile: // struct foo {...} volatile x; 1042 case tok::kw_restrict: // struct foo {...} restrict x; 1043 case tok::kw_inline: // struct foo {...} inline foo() {}; 1044 // Storage-class specifiers 1045 case tok::kw_static: // struct foo {...} static x; 1046 case tok::kw_extern: // struct foo {...} extern x; 1047 case tok::kw_typedef: // struct foo {...} typedef x; 1048 case tok::kw_register: // struct foo {...} register x; 1049 case tok::kw_auto: // struct foo {...} auto x; 1050 case tok::kw_mutable: // struct foo {...} mutable x; 1051 // As shown above, type qualifiers and storage class specifiers absolutely 1052 // can occur after class specifiers according to the grammar. However, 1053 // almost noone actually writes code like this. If we see one of these, 1054 // it is much more likely that someone missed a semi colon and the 1055 // type/storage class specifier we're seeing is part of the *next* 1056 // intended declaration, as in: 1057 // 1058 // struct foo { ... } 1059 // typedef int X; 1060 // 1061 // We'd really like to emit a missing semicolon error instead of emitting 1062 // an error on the 'int' saying that you can't have two type specifiers in 1063 // the same declaration of X. Because of this, we look ahead past this 1064 // token to see if it's a type specifier. If so, we know the code is 1065 // otherwise invalid, so we can produce the expected semi error. 1066 if (!isKnownToBeTypeSpecifier(NextToken())) 1067 ExpectedSemi = false; 1068 break; 1069 1070 case tok::r_brace: // struct bar { struct foo {...} } 1071 // Missing ';' at end of struct is accepted as an extension in C mode. 1072 if (!getLang().CPlusPlus) 1073 ExpectedSemi = false; 1074 break; 1075 } 1076 1077 if (ExpectedSemi) { 1078 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1079 TagType == DeclSpec::TST_class ? "class" 1080 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1081 // Push this token back into the preprocessor and change our current token 1082 // to ';' so that the rest of the code recovers as though there were an 1083 // ';' after the definition. 1084 PP.EnterToken(Tok); 1085 Tok.setKind(tok::semi); 1086 } 1087 } 1088} 1089 1090/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1091/// 1092/// base-clause : [C++ class.derived] 1093/// ':' base-specifier-list 1094/// base-specifier-list: 1095/// base-specifier '...'[opt] 1096/// base-specifier-list ',' base-specifier '...'[opt] 1097void Parser::ParseBaseClause(Decl *ClassDecl) { 1098 assert(Tok.is(tok::colon) && "Not a base clause"); 1099 ConsumeToken(); 1100 1101 // Build up an array of parsed base specifiers. 1102 llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1103 1104 while (true) { 1105 // Parse a base-specifier. 1106 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1107 if (Result.isInvalid()) { 1108 // Skip the rest of this base specifier, up until the comma or 1109 // opening brace. 1110 SkipUntil(tok::comma, tok::l_brace, true, true); 1111 } else { 1112 // Add this to our array of base specifiers. 1113 BaseInfo.push_back(Result.get()); 1114 } 1115 1116 // If the next token is a comma, consume it and keep reading 1117 // base-specifiers. 1118 if (Tok.isNot(tok::comma)) break; 1119 1120 // Consume the comma. 1121 ConsumeToken(); 1122 } 1123 1124 // Attach the base specifiers 1125 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1126} 1127 1128/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1129/// one entry in the base class list of a class specifier, for example: 1130/// class foo : public bar, virtual private baz { 1131/// 'public bar' and 'virtual private baz' are each base-specifiers. 1132/// 1133/// base-specifier: [C++ class.derived] 1134/// ::[opt] nested-name-specifier[opt] class-name 1135/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1136/// class-name 1137/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1138/// class-name 1139Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1140 bool IsVirtual = false; 1141 SourceLocation StartLoc = Tok.getLocation(); 1142 1143 // Parse the 'virtual' keyword. 1144 if (Tok.is(tok::kw_virtual)) { 1145 ConsumeToken(); 1146 IsVirtual = true; 1147 } 1148 1149 // Parse an (optional) access specifier. 1150 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1151 if (Access != AS_none) 1152 ConsumeToken(); 1153 1154 // Parse the 'virtual' keyword (again!), in case it came after the 1155 // access specifier. 1156 if (Tok.is(tok::kw_virtual)) { 1157 SourceLocation VirtualLoc = ConsumeToken(); 1158 if (IsVirtual) { 1159 // Complain about duplicate 'virtual' 1160 Diag(VirtualLoc, diag::err_dup_virtual) 1161 << FixItHint::CreateRemoval(VirtualLoc); 1162 } 1163 1164 IsVirtual = true; 1165 } 1166 1167 // Parse optional '::' and optional nested-name-specifier. 1168 CXXScopeSpec SS; 1169 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1170 1171 // The location of the base class itself. 1172 SourceLocation BaseLoc = Tok.getLocation(); 1173 1174 // Parse the class-name. 1175 SourceLocation EndLocation; 1176 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1177 if (BaseType.isInvalid()) 1178 return true; 1179 1180 // Find the complete source range for the base-specifier. 1181 SourceRange Range(StartLoc, EndLocation); 1182 1183 // Notify semantic analysis that we have parsed a complete 1184 // base-specifier. 1185 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1186 BaseType.get(), BaseLoc); 1187} 1188 1189/// getAccessSpecifierIfPresent - Determine whether the next token is 1190/// a C++ access-specifier. 1191/// 1192/// access-specifier: [C++ class.derived] 1193/// 'private' 1194/// 'protected' 1195/// 'public' 1196AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1197 switch (Tok.getKind()) { 1198 default: return AS_none; 1199 case tok::kw_private: return AS_private; 1200 case tok::kw_protected: return AS_protected; 1201 case tok::kw_public: return AS_public; 1202 } 1203} 1204 1205void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1206 Decl *ThisDecl) { 1207 // We just declared a member function. If this member function 1208 // has any default arguments, we'll need to parse them later. 1209 LateParsedMethodDeclaration *LateMethod = 0; 1210 DeclaratorChunk::FunctionTypeInfo &FTI 1211 = DeclaratorInfo.getTypeObject(0).Fun; 1212 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1213 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1214 if (!LateMethod) { 1215 // Push this method onto the stack of late-parsed method 1216 // declarations. 1217 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1218 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1219 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1220 1221 // Add all of the parameters prior to this one (they don't 1222 // have default arguments). 1223 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1224 for (unsigned I = 0; I < ParamIdx; ++I) 1225 LateMethod->DefaultArgs.push_back( 1226 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1227 } 1228 1229 // Add this parameter to the list of parameters (it or may 1230 // not have a default argument). 1231 LateMethod->DefaultArgs.push_back( 1232 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1233 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1234 } 1235 } 1236} 1237 1238/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1239/// 1240/// member-declaration: 1241/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1242/// function-definition ';'[opt] 1243/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1244/// using-declaration [TODO] 1245/// [C++0x] static_assert-declaration 1246/// template-declaration 1247/// [GNU] '__extension__' member-declaration 1248/// 1249/// member-declarator-list: 1250/// member-declarator 1251/// member-declarator-list ',' member-declarator 1252/// 1253/// member-declarator: 1254/// declarator pure-specifier[opt] 1255/// declarator constant-initializer[opt] 1256/// identifier[opt] ':' constant-expression 1257/// 1258/// pure-specifier: 1259/// '= 0' 1260/// 1261/// constant-initializer: 1262/// '=' constant-expression 1263/// 1264void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1265 const ParsedTemplateInfo &TemplateInfo, 1266 ParsingDeclRAIIObject *TemplateDiags) { 1267 // Access declarations. 1268 if (!TemplateInfo.Kind && 1269 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1270 !TryAnnotateCXXScopeToken() && 1271 Tok.is(tok::annot_cxxscope)) { 1272 bool isAccessDecl = false; 1273 if (NextToken().is(tok::identifier)) 1274 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1275 else 1276 isAccessDecl = NextToken().is(tok::kw_operator); 1277 1278 if (isAccessDecl) { 1279 // Collect the scope specifier token we annotated earlier. 1280 CXXScopeSpec SS; 1281 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1282 1283 // Try to parse an unqualified-id. 1284 UnqualifiedId Name; 1285 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1286 SkipUntil(tok::semi); 1287 return; 1288 } 1289 1290 // TODO: recover from mistakenly-qualified operator declarations. 1291 if (ExpectAndConsume(tok::semi, 1292 diag::err_expected_semi_after, 1293 "access declaration", 1294 tok::semi)) 1295 return; 1296 1297 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1298 false, SourceLocation(), 1299 SS, Name, 1300 /* AttrList */ 0, 1301 /* IsTypeName */ false, 1302 SourceLocation()); 1303 return; 1304 } 1305 } 1306 1307 // static_assert-declaration 1308 if (Tok.is(tok::kw_static_assert)) { 1309 // FIXME: Check for templates 1310 SourceLocation DeclEnd; 1311 ParseStaticAssertDeclaration(DeclEnd); 1312 return; 1313 } 1314 1315 if (Tok.is(tok::kw_template)) { 1316 assert(!TemplateInfo.TemplateParams && 1317 "Nested template improperly parsed?"); 1318 SourceLocation DeclEnd; 1319 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1320 AS); 1321 return; 1322 } 1323 1324 // Handle: member-declaration ::= '__extension__' member-declaration 1325 if (Tok.is(tok::kw___extension__)) { 1326 // __extension__ silences extension warnings in the subexpression. 1327 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1328 ConsumeToken(); 1329 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1330 } 1331 1332 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1333 // is a bitfield. 1334 ColonProtectionRAIIObject X(*this); 1335 1336 CXX0XAttributeList AttrList; 1337 // Optional C++0x attribute-specifier 1338 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 1339 AttrList = ParseCXX0XAttributes(); 1340 if (getLang().Microsoft && Tok.is(tok::l_square)) 1341 ParseMicrosoftAttributes(); 1342 1343 if (Tok.is(tok::kw_using)) { 1344 // FIXME: Check for template aliases 1345 1346 if (AttrList.HasAttr) 1347 Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed) 1348 << AttrList.Range; 1349 1350 // Eat 'using'. 1351 SourceLocation UsingLoc = ConsumeToken(); 1352 1353 if (Tok.is(tok::kw_namespace)) { 1354 Diag(UsingLoc, diag::err_using_namespace_in_class); 1355 SkipUntil(tok::semi, true, true); 1356 } else { 1357 SourceLocation DeclEnd; 1358 // Otherwise, it must be using-declaration. 1359 ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS); 1360 } 1361 return; 1362 } 1363 1364 SourceLocation DSStart = Tok.getLocation(); 1365 // decl-specifier-seq: 1366 // Parse the common declaration-specifiers piece. 1367 ParsingDeclSpec DS(*this, TemplateDiags); 1368 DS.AddAttributes(AttrList.AttrList); 1369 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1370 1371 MultiTemplateParamsArg TemplateParams(Actions, 1372 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1373 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1374 1375 if (Tok.is(tok::semi)) { 1376 ConsumeToken(); 1377 Decl *TheDecl = 1378 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 1379 DS.complete(TheDecl); 1380 return; 1381 } 1382 1383 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1384 1385 if (Tok.isNot(tok::colon)) { 1386 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1387 ColonProtectionRAIIObject X(*this); 1388 1389 // Parse the first declarator. 1390 ParseDeclarator(DeclaratorInfo); 1391 // Error parsing the declarator? 1392 if (!DeclaratorInfo.hasName()) { 1393 // If so, skip until the semi-colon or a }. 1394 SkipUntil(tok::r_brace, true); 1395 if (Tok.is(tok::semi)) 1396 ConsumeToken(); 1397 return; 1398 } 1399 1400 // If attributes exist after the declarator, but before an '{', parse them. 1401 if (Tok.is(tok::kw___attribute)) { 1402 SourceLocation Loc; 1403 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1404 DeclaratorInfo.AddAttributes(AttrList, Loc); 1405 } 1406 1407 // function-definition: 1408 if (Tok.is(tok::l_brace) 1409 || (DeclaratorInfo.isFunctionDeclarator() && 1410 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1411 if (!DeclaratorInfo.isFunctionDeclarator()) { 1412 Diag(Tok, diag::err_func_def_no_params); 1413 ConsumeBrace(); 1414 SkipUntil(tok::r_brace, true); 1415 return; 1416 } 1417 1418 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1419 Diag(Tok, diag::err_function_declared_typedef); 1420 // This recovery skips the entire function body. It would be nice 1421 // to simply call ParseCXXInlineMethodDef() below, however Sema 1422 // assumes the declarator represents a function, not a typedef. 1423 ConsumeBrace(); 1424 SkipUntil(tok::r_brace, true); 1425 return; 1426 } 1427 1428 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1429 return; 1430 } 1431 } 1432 1433 // member-declarator-list: 1434 // member-declarator 1435 // member-declarator-list ',' member-declarator 1436 1437 llvm::SmallVector<Decl *, 8> DeclsInGroup; 1438 ExprResult BitfieldSize; 1439 ExprResult Init; 1440 bool Deleted = false; 1441 1442 while (1) { 1443 // member-declarator: 1444 // declarator pure-specifier[opt] 1445 // declarator constant-initializer[opt] 1446 // identifier[opt] ':' constant-expression 1447 if (Tok.is(tok::colon)) { 1448 ConsumeToken(); 1449 BitfieldSize = ParseConstantExpression(); 1450 if (BitfieldSize.isInvalid()) 1451 SkipUntil(tok::comma, true, true); 1452 } 1453 1454 // pure-specifier: 1455 // '= 0' 1456 // 1457 // constant-initializer: 1458 // '=' constant-expression 1459 // 1460 // defaulted/deleted function-definition: 1461 // '=' 'default' [TODO] 1462 // '=' 'delete' 1463 if (Tok.is(tok::equal)) { 1464 ConsumeToken(); 1465 if (Tok.is(tok::kw_delete)) { 1466 if (!getLang().CPlusPlus0x) 1467 Diag(Tok, diag::warn_deleted_function_accepted_as_extension); 1468 ConsumeToken(); 1469 Deleted = true; 1470 } else { 1471 Init = ParseInitializer(); 1472 if (Init.isInvalid()) 1473 SkipUntil(tok::comma, true, true); 1474 } 1475 } 1476 1477 // If a simple-asm-expr is present, parse it. 1478 if (Tok.is(tok::kw_asm)) { 1479 SourceLocation Loc; 1480 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1481 if (AsmLabel.isInvalid()) 1482 SkipUntil(tok::comma, true, true); 1483 1484 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1485 DeclaratorInfo.SetRangeEnd(Loc); 1486 } 1487 1488 // If attributes exist after the declarator, parse them. 1489 if (Tok.is(tok::kw___attribute)) { 1490 SourceLocation Loc; 1491 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1492 DeclaratorInfo.AddAttributes(AttrList, Loc); 1493 } 1494 1495 // NOTE: If Sema is the Action module and declarator is an instance field, 1496 // this call will *not* return the created decl; It will return null. 1497 // See Sema::ActOnCXXMemberDeclarator for details. 1498 1499 Decl *ThisDecl = 0; 1500 if (DS.isFriendSpecified()) { 1501 // TODO: handle initializers, bitfields, 'delete' 1502 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1503 /*IsDefinition*/ false, 1504 move(TemplateParams)); 1505 } else { 1506 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1507 DeclaratorInfo, 1508 move(TemplateParams), 1509 BitfieldSize.release(), 1510 Init.release(), 1511 /*IsDefinition*/Deleted, 1512 Deleted); 1513 } 1514 if (ThisDecl) 1515 DeclsInGroup.push_back(ThisDecl); 1516 1517 if (DeclaratorInfo.isFunctionDeclarator() && 1518 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1519 != DeclSpec::SCS_typedef) { 1520 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1521 } 1522 1523 DeclaratorInfo.complete(ThisDecl); 1524 1525 // If we don't have a comma, it is either the end of the list (a ';') 1526 // or an error, bail out. 1527 if (Tok.isNot(tok::comma)) 1528 break; 1529 1530 // Consume the comma. 1531 ConsumeToken(); 1532 1533 // Parse the next declarator. 1534 DeclaratorInfo.clear(); 1535 BitfieldSize = 0; 1536 Init = 0; 1537 Deleted = false; 1538 1539 // Attributes are only allowed on the second declarator. 1540 if (Tok.is(tok::kw___attribute)) { 1541 SourceLocation Loc; 1542 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1543 DeclaratorInfo.AddAttributes(AttrList, Loc); 1544 } 1545 1546 if (Tok.isNot(tok::colon)) 1547 ParseDeclarator(DeclaratorInfo); 1548 } 1549 1550 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1551 // Skip to end of block or statement. 1552 SkipUntil(tok::r_brace, true, true); 1553 // If we stopped at a ';', eat it. 1554 if (Tok.is(tok::semi)) ConsumeToken(); 1555 return; 1556 } 1557 1558 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1559 DeclsInGroup.size()); 1560} 1561 1562/// ParseCXXMemberSpecification - Parse the class definition. 1563/// 1564/// member-specification: 1565/// member-declaration member-specification[opt] 1566/// access-specifier ':' member-specification[opt] 1567/// 1568void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1569 unsigned TagType, Decl *TagDecl) { 1570 assert((TagType == DeclSpec::TST_struct || 1571 TagType == DeclSpec::TST_union || 1572 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1573 1574 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 1575 "parsing struct/union/class body"); 1576 1577 // Determine whether this is a non-nested class. Note that local 1578 // classes are *not* considered to be nested classes. 1579 bool NonNestedClass = true; 1580 if (!ClassStack.empty()) { 1581 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 1582 if (S->isClassScope()) { 1583 // We're inside a class scope, so this is a nested class. 1584 NonNestedClass = false; 1585 break; 1586 } 1587 1588 if ((S->getFlags() & Scope::FnScope)) { 1589 // If we're in a function or function template declared in the 1590 // body of a class, then this is a local class rather than a 1591 // nested class. 1592 const Scope *Parent = S->getParent(); 1593 if (Parent->isTemplateParamScope()) 1594 Parent = Parent->getParent(); 1595 if (Parent->isClassScope()) 1596 break; 1597 } 1598 } 1599 } 1600 1601 // Enter a scope for the class. 1602 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1603 1604 // Note that we are parsing a new (potentially-nested) class definition. 1605 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1606 1607 if (TagDecl) 1608 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 1609 1610 if (Tok.is(tok::colon)) { 1611 ParseBaseClause(TagDecl); 1612 1613 if (!Tok.is(tok::l_brace)) { 1614 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1615 1616 if (TagDecl) 1617 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 1618 return; 1619 } 1620 } 1621 1622 assert(Tok.is(tok::l_brace)); 1623 1624 SourceLocation LBraceLoc = ConsumeBrace(); 1625 1626 if (TagDecl) 1627 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, LBraceLoc); 1628 1629 // C++ 11p3: Members of a class defined with the keyword class are private 1630 // by default. Members of a class defined with the keywords struct or union 1631 // are public by default. 1632 AccessSpecifier CurAS; 1633 if (TagType == DeclSpec::TST_class) 1634 CurAS = AS_private; 1635 else 1636 CurAS = AS_public; 1637 1638 SourceLocation RBraceLoc; 1639 if (TagDecl) { 1640 // While we still have something to read, read the member-declarations. 1641 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1642 // Each iteration of this loop reads one member-declaration. 1643 1644 // Check for extraneous top-level semicolon. 1645 if (Tok.is(tok::semi)) { 1646 Diag(Tok, diag::ext_extra_struct_semi) 1647 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 1648 << FixItHint::CreateRemoval(Tok.getLocation()); 1649 ConsumeToken(); 1650 continue; 1651 } 1652 1653 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1654 if (AS != AS_none) { 1655 // Current token is a C++ access specifier. 1656 CurAS = AS; 1657 SourceLocation ASLoc = Tok.getLocation(); 1658 ConsumeToken(); 1659 if (Tok.is(tok::colon)) 1660 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 1661 else 1662 Diag(Tok, diag::err_expected_colon); 1663 ConsumeToken(); 1664 continue; 1665 } 1666 1667 // FIXME: Make sure we don't have a template here. 1668 1669 // Parse all the comma separated declarators. 1670 ParseCXXClassMemberDeclaration(CurAS); 1671 } 1672 1673 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1674 } else { 1675 SkipUntil(tok::r_brace, false, false); 1676 } 1677 1678 // If attributes exist after class contents, parse them. 1679 llvm::OwningPtr<AttributeList> AttrList; 1680 if (Tok.is(tok::kw___attribute)) 1681 AttrList.reset(ParseGNUAttributes()); 1682 1683 if (TagDecl) 1684 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 1685 LBraceLoc, RBraceLoc, 1686 AttrList.get()); 1687 1688 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1689 // complete within function bodies, default arguments, 1690 // exception-specifications, and constructor ctor-initializers (including 1691 // such things in nested classes). 1692 // 1693 // FIXME: Only function bodies and constructor ctor-initializers are 1694 // parsed correctly, fix the rest. 1695 if (TagDecl && NonNestedClass) { 1696 // We are not inside a nested class. This class and its nested classes 1697 // are complete and we can parse the delayed portions of method 1698 // declarations and the lexed inline method definitions. 1699 SourceLocation SavedPrevTokLocation = PrevTokLocation; 1700 ParseLexedMethodDeclarations(getCurrentClass()); 1701 ParseLexedMethodDefs(getCurrentClass()); 1702 PrevTokLocation = SavedPrevTokLocation; 1703 } 1704 1705 if (TagDecl) 1706 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 1707 1708 // Leave the class scope. 1709 ParsingDef.Pop(); 1710 ClassScope.Exit(); 1711} 1712 1713/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1714/// which explicitly initializes the members or base classes of a 1715/// class (C++ [class.base.init]). For example, the three initializers 1716/// after the ':' in the Derived constructor below: 1717/// 1718/// @code 1719/// class Base { }; 1720/// class Derived : Base { 1721/// int x; 1722/// float f; 1723/// public: 1724/// Derived(float f) : Base(), x(17), f(f) { } 1725/// }; 1726/// @endcode 1727/// 1728/// [C++] ctor-initializer: 1729/// ':' mem-initializer-list 1730/// 1731/// [C++] mem-initializer-list: 1732/// mem-initializer 1733/// mem-initializer , mem-initializer-list 1734void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 1735 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1736 1737 SourceLocation ColonLoc = ConsumeToken(); 1738 1739 llvm::SmallVector<CXXBaseOrMemberInitializer*, 4> MemInitializers; 1740 bool AnyErrors = false; 1741 1742 do { 1743 if (Tok.is(tok::code_completion)) { 1744 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 1745 MemInitializers.data(), 1746 MemInitializers.size()); 1747 ConsumeCodeCompletionToken(); 1748 } else { 1749 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1750 if (!MemInit.isInvalid()) 1751 MemInitializers.push_back(MemInit.get()); 1752 else 1753 AnyErrors = true; 1754 } 1755 1756 if (Tok.is(tok::comma)) 1757 ConsumeToken(); 1758 else if (Tok.is(tok::l_brace)) 1759 break; 1760 // If the next token looks like a base or member initializer, assume that 1761 // we're just missing a comma. 1762 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 1763 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 1764 Diag(Loc, diag::err_ctor_init_missing_comma) 1765 << FixItHint::CreateInsertion(Loc, ", "); 1766 } else { 1767 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1768 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1769 SkipUntil(tok::l_brace, true, true); 1770 break; 1771 } 1772 } while (true); 1773 1774 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1775 MemInitializers.data(), MemInitializers.size(), 1776 AnyErrors); 1777} 1778 1779/// ParseMemInitializer - Parse a C++ member initializer, which is 1780/// part of a constructor initializer that explicitly initializes one 1781/// member or base class (C++ [class.base.init]). See 1782/// ParseConstructorInitializer for an example. 1783/// 1784/// [C++] mem-initializer: 1785/// mem-initializer-id '(' expression-list[opt] ')' 1786/// 1787/// [C++] mem-initializer-id: 1788/// '::'[opt] nested-name-specifier[opt] class-name 1789/// identifier 1790Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 1791 // parse '::'[opt] nested-name-specifier[opt] 1792 CXXScopeSpec SS; 1793 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1794 ParsedType TemplateTypeTy; 1795 if (Tok.is(tok::annot_template_id)) { 1796 TemplateIdAnnotation *TemplateId 1797 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1798 if (TemplateId->Kind == TNK_Type_template || 1799 TemplateId->Kind == TNK_Dependent_template_name) { 1800 AnnotateTemplateIdTokenAsType(&SS); 1801 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1802 TemplateTypeTy = getTypeAnnotation(Tok); 1803 } 1804 } 1805 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1806 Diag(Tok, diag::err_expected_member_or_base_name); 1807 return true; 1808 } 1809 1810 // Get the identifier. This may be a member name or a class name, 1811 // but we'll let the semantic analysis determine which it is. 1812 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1813 SourceLocation IdLoc = ConsumeToken(); 1814 1815 // Parse the '('. 1816 if (Tok.isNot(tok::l_paren)) { 1817 Diag(Tok, diag::err_expected_lparen); 1818 return true; 1819 } 1820 SourceLocation LParenLoc = ConsumeParen(); 1821 1822 // Parse the optional expression-list. 1823 ExprVector ArgExprs(Actions); 1824 CommaLocsTy CommaLocs; 1825 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1826 SkipUntil(tok::r_paren); 1827 return true; 1828 } 1829 1830 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1831 1832 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 1833 TemplateTypeTy, IdLoc, 1834 LParenLoc, ArgExprs.take(), 1835 ArgExprs.size(), RParenLoc); 1836} 1837 1838/// ParseExceptionSpecification - Parse a C++ exception-specification 1839/// (C++ [except.spec]). 1840/// 1841/// exception-specification: 1842/// 'throw' '(' type-id-list [opt] ')' 1843/// [MS] 'throw' '(' '...' ')' 1844/// 1845/// type-id-list: 1846/// type-id 1847/// type-id-list ',' type-id 1848/// 1849bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 1850 llvm::SmallVectorImpl<ParsedType> 1851 &Exceptions, 1852 llvm::SmallVectorImpl<SourceRange> 1853 &Ranges, 1854 bool &hasAnyExceptionSpec) { 1855 assert(Tok.is(tok::kw_throw) && "expected throw"); 1856 1857 SourceLocation ThrowLoc = ConsumeToken(); 1858 1859 if (!Tok.is(tok::l_paren)) { 1860 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 1861 } 1862 SourceLocation LParenLoc = ConsumeParen(); 1863 1864 // Parse throw(...), a Microsoft extension that means "this function 1865 // can throw anything". 1866 if (Tok.is(tok::ellipsis)) { 1867 hasAnyExceptionSpec = true; 1868 SourceLocation EllipsisLoc = ConsumeToken(); 1869 if (!getLang().Microsoft) 1870 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 1871 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1872 return false; 1873 } 1874 1875 // Parse the sequence of type-ids. 1876 SourceRange Range; 1877 while (Tok.isNot(tok::r_paren)) { 1878 TypeResult Res(ParseTypeName(&Range)); 1879 if (!Res.isInvalid()) { 1880 Exceptions.push_back(Res.get()); 1881 Ranges.push_back(Range); 1882 } 1883 if (Tok.is(tok::comma)) 1884 ConsumeToken(); 1885 else 1886 break; 1887 } 1888 1889 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1890 return false; 1891} 1892 1893/// ParseTrailingReturnType - Parse a trailing return type on a new-style 1894/// function declaration. 1895TypeResult Parser::ParseTrailingReturnType() { 1896 assert(Tok.is(tok::arrow) && "expected arrow"); 1897 1898 ConsumeToken(); 1899 1900 // FIXME: Need to suppress declarations when parsing this typename. 1901 // Otherwise in this function definition: 1902 // 1903 // auto f() -> struct X {} 1904 // 1905 // struct X is parsed as class definition because of the trailing 1906 // brace. 1907 1908 SourceRange Range; 1909 return ParseTypeName(&Range); 1910} 1911 1912/// \brief We have just started parsing the definition of a new class, 1913/// so push that class onto our stack of classes that is currently 1914/// being parsed. 1915void Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 1916 assert((NonNestedClass || !ClassStack.empty()) && 1917 "Nested class without outer class"); 1918 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 1919} 1920 1921/// \brief Deallocate the given parsed class and all of its nested 1922/// classes. 1923void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 1924 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 1925 delete Class->LateParsedDeclarations[I]; 1926 delete Class; 1927} 1928 1929/// \brief Pop the top class of the stack of classes that are 1930/// currently being parsed. 1931/// 1932/// This routine should be called when we have finished parsing the 1933/// definition of a class, but have not yet popped the Scope 1934/// associated with the class's definition. 1935/// 1936/// \returns true if the class we've popped is a top-level class, 1937/// false otherwise. 1938void Parser::PopParsingClass() { 1939 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 1940 1941 ParsingClass *Victim = ClassStack.top(); 1942 ClassStack.pop(); 1943 if (Victim->TopLevelClass) { 1944 // Deallocate all of the nested classes of this class, 1945 // recursively: we don't need to keep any of this information. 1946 DeallocateParsedClasses(Victim); 1947 return; 1948 } 1949 assert(!ClassStack.empty() && "Missing top-level class?"); 1950 1951 if (Victim->LateParsedDeclarations.empty()) { 1952 // The victim is a nested class, but we will not need to perform 1953 // any processing after the definition of this class since it has 1954 // no members whose handling was delayed. Therefore, we can just 1955 // remove this nested class. 1956 DeallocateParsedClasses(Victim); 1957 return; 1958 } 1959 1960 // This nested class has some members that will need to be processed 1961 // after the top-level class is completely defined. Therefore, add 1962 // it to the list of nested classes within its parent. 1963 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 1964 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 1965 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 1966} 1967 1968/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 1969/// parses standard attributes. 1970/// 1971/// [C++0x] attribute-specifier: 1972/// '[' '[' attribute-list ']' ']' 1973/// 1974/// [C++0x] attribute-list: 1975/// attribute[opt] 1976/// attribute-list ',' attribute[opt] 1977/// 1978/// [C++0x] attribute: 1979/// attribute-token attribute-argument-clause[opt] 1980/// 1981/// [C++0x] attribute-token: 1982/// identifier 1983/// attribute-scoped-token 1984/// 1985/// [C++0x] attribute-scoped-token: 1986/// attribute-namespace '::' identifier 1987/// 1988/// [C++0x] attribute-namespace: 1989/// identifier 1990/// 1991/// [C++0x] attribute-argument-clause: 1992/// '(' balanced-token-seq ')' 1993/// 1994/// [C++0x] balanced-token-seq: 1995/// balanced-token 1996/// balanced-token-seq balanced-token 1997/// 1998/// [C++0x] balanced-token: 1999/// '(' balanced-token-seq ')' 2000/// '[' balanced-token-seq ']' 2001/// '{' balanced-token-seq '}' 2002/// any token but '(', ')', '[', ']', '{', or '}' 2003CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) { 2004 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2005 && "Not a C++0x attribute list"); 2006 2007 SourceLocation StartLoc = Tok.getLocation(), Loc; 2008 AttributeList *CurrAttr = 0; 2009 2010 ConsumeBracket(); 2011 ConsumeBracket(); 2012 2013 if (Tok.is(tok::comma)) { 2014 Diag(Tok.getLocation(), diag::err_expected_ident); 2015 ConsumeToken(); 2016 } 2017 2018 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2019 // attribute not present 2020 if (Tok.is(tok::comma)) { 2021 ConsumeToken(); 2022 continue; 2023 } 2024 2025 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2026 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2027 2028 // scoped attribute 2029 if (Tok.is(tok::coloncolon)) { 2030 ConsumeToken(); 2031 2032 if (!Tok.is(tok::identifier)) { 2033 Diag(Tok.getLocation(), diag::err_expected_ident); 2034 SkipUntil(tok::r_square, tok::comma, true, true); 2035 continue; 2036 } 2037 2038 ScopeName = AttrName; 2039 ScopeLoc = AttrLoc; 2040 2041 AttrName = Tok.getIdentifierInfo(); 2042 AttrLoc = ConsumeToken(); 2043 } 2044 2045 bool AttrParsed = false; 2046 // No scoped names are supported; ideally we could put all non-standard 2047 // attributes into namespaces. 2048 if (!ScopeName) { 2049 switch(AttributeList::getKind(AttrName)) 2050 { 2051 // No arguments 2052 case AttributeList::AT_base_check: 2053 case AttributeList::AT_carries_dependency: 2054 case AttributeList::AT_final: 2055 case AttributeList::AT_hiding: 2056 case AttributeList::AT_noreturn: 2057 case AttributeList::AT_override: { 2058 if (Tok.is(tok::l_paren)) { 2059 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2060 << AttrName->getName(); 2061 break; 2062 } 2063 2064 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0, 2065 SourceLocation(), 0, 0, CurrAttr, false, 2066 true); 2067 AttrParsed = true; 2068 break; 2069 } 2070 2071 // One argument; must be a type-id or assignment-expression 2072 case AttributeList::AT_aligned: { 2073 if (Tok.isNot(tok::l_paren)) { 2074 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2075 << AttrName->getName(); 2076 break; 2077 } 2078 SourceLocation ParamLoc = ConsumeParen(); 2079 2080 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2081 2082 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2083 2084 ExprVector ArgExprs(Actions); 2085 ArgExprs.push_back(ArgExpr.release()); 2086 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 2087 0, ParamLoc, ArgExprs.take(), 1, CurrAttr, 2088 false, true); 2089 2090 AttrParsed = true; 2091 break; 2092 } 2093 2094 // Silence warnings 2095 default: break; 2096 } 2097 } 2098 2099 // Skip the entire parameter clause, if any 2100 if (!AttrParsed && Tok.is(tok::l_paren)) { 2101 ConsumeParen(); 2102 // SkipUntil maintains the balancedness of tokens. 2103 SkipUntil(tok::r_paren, false); 2104 } 2105 } 2106 2107 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2108 SkipUntil(tok::r_square, false); 2109 Loc = Tok.getLocation(); 2110 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2111 SkipUntil(tok::r_square, false); 2112 2113 CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true); 2114 return Attr; 2115} 2116 2117/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2118/// attribute. 2119/// 2120/// FIXME: Simply returns an alignof() expression if the argument is a 2121/// type. Ideally, the type should be propagated directly into Sema. 2122/// 2123/// [C++0x] 'align' '(' type-id ')' 2124/// [C++0x] 'align' '(' assignment-expression ')' 2125ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2126 if (isTypeIdInParens()) { 2127 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2128 SourceLocation TypeLoc = Tok.getLocation(); 2129 ParsedType Ty = ParseTypeName().get(); 2130 SourceRange TypeRange(Start, Tok.getLocation()); 2131 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, 2132 Ty.getAsOpaquePtr(), TypeRange); 2133 } else 2134 return ParseConstantExpression(); 2135} 2136 2137/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2138/// 2139/// [MS] ms-attribute: 2140/// '[' token-seq ']' 2141/// 2142/// [MS] ms-attribute-seq: 2143/// ms-attribute[opt] 2144/// ms-attribute ms-attribute-seq 2145void Parser::ParseMicrosoftAttributes() { 2146 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2147 2148 while (Tok.is(tok::l_square)) { 2149 ConsumeBracket(); 2150 SkipUntil(tok::r_square, true, true); 2151 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2152 } 2153} 2154