ParseDeclCXX.cpp revision ce93a7cee6c0ea979c12b278771a79c4d6a37fc0
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 ParsedAttributes attrs; 73 if (Tok.is(tok::kw___attribute)) { 74 attrTok = Tok; 75 76 // FIXME: save these somewhere. 77 ParseGNUAttributes(attrs); 78 } 79 80 if (Tok.is(tok::equal)) { 81 if (!attrs.empty()) 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, attrs.getList()); 116 117 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 118 "parsing namespace"); 119 120 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 121 ParsedAttributesWithRange attrs; 122 MaybeParseCXX0XAttributes(attrs); 123 MaybeParseMicrosoftAttributes(attrs); 124 ParseExternalDeclaration(attrs); 125 } 126 127 // Leave the namespace scope. 128 NamespaceScope.Exit(); 129 130 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 131 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 132 133 DeclEnd = RBraceLoc; 134 return NamespcDecl; 135} 136 137/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 138/// alias definition. 139/// 140Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 141 SourceLocation AliasLoc, 142 IdentifierInfo *Alias, 143 SourceLocation &DeclEnd) { 144 assert(Tok.is(tok::equal) && "Not equal token"); 145 146 ConsumeToken(); // eat the '='. 147 148 if (Tok.is(tok::code_completion)) { 149 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 150 ConsumeCodeCompletionToken(); 151 } 152 153 CXXScopeSpec SS; 154 // Parse (optional) nested-name-specifier. 155 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 156 157 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 158 Diag(Tok, diag::err_expected_namespace_name); 159 // Skip to end of the definition and eat the ';'. 160 SkipUntil(tok::semi); 161 return 0; 162 } 163 164 // Parse identifier. 165 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 166 SourceLocation IdentLoc = ConsumeToken(); 167 168 // Eat the ';'. 169 DeclEnd = Tok.getLocation(); 170 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 171 "", tok::semi); 172 173 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 174 SS, IdentLoc, Ident); 175} 176 177/// ParseLinkage - We know that the current token is a string_literal 178/// and just before that, that extern was seen. 179/// 180/// linkage-specification: [C++ 7.5p2: dcl.link] 181/// 'extern' string-literal '{' declaration-seq[opt] '}' 182/// 'extern' string-literal declaration 183/// 184Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 185 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 186 llvm::SmallString<8> LangBuffer; 187 bool Invalid = false; 188 llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 189 if (Invalid) 190 return 0; 191 192 SourceLocation Loc = ConsumeStringToken(); 193 194 ParseScope LinkageScope(this, Scope::DeclScope); 195 Decl *LinkageSpec 196 = Actions.ActOnStartLinkageSpecification(getCurScope(), 197 /*FIXME: */SourceLocation(), 198 Loc, Lang, 199 Tok.is(tok::l_brace)? Tok.getLocation() 200 : SourceLocation()); 201 202 ParsedAttributesWithRange attrs; 203 MaybeParseCXX0XAttributes(attrs); 204 MaybeParseMicrosoftAttributes(attrs); 205 206 if (Tok.isNot(tok::l_brace)) { 207 DS.setExternInLinkageSpec(true); 208 ParseExternalDeclaration(attrs, &DS); 209 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 210 SourceLocation()); 211 } 212 213 DS.abort(); 214 215 ProhibitAttributes(attrs); 216 217 SourceLocation LBrace = ConsumeBrace(); 218 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 219 ParsedAttributesWithRange attrs; 220 MaybeParseCXX0XAttributes(attrs); 221 MaybeParseMicrosoftAttributes(attrs); 222 ParseExternalDeclaration(attrs); 223 } 224 225 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 226 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 227 RBrace); 228} 229 230/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 231/// using-directive. Assumes that current token is 'using'. 232Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 233 const ParsedTemplateInfo &TemplateInfo, 234 SourceLocation &DeclEnd, 235 ParsedAttributesWithRange &attrs) { 236 assert(Tok.is(tok::kw_using) && "Not using token"); 237 238 // Eat 'using'. 239 SourceLocation UsingLoc = ConsumeToken(); 240 241 if (Tok.is(tok::code_completion)) { 242 Actions.CodeCompleteUsing(getCurScope()); 243 ConsumeCodeCompletionToken(); 244 } 245 246 // 'using namespace' means this is a using-directive. 247 if (Tok.is(tok::kw_namespace)) { 248 // Template parameters are always an error here. 249 if (TemplateInfo.Kind) { 250 SourceRange R = TemplateInfo.getSourceRange(); 251 Diag(UsingLoc, diag::err_templated_using_directive) 252 << R << FixItHint::CreateRemoval(R); 253 } 254 255 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 256 } 257 258 // Otherwise, it must be a using-declaration. 259 260 // Using declarations can't have attributes. 261 ProhibitAttributes(attrs); 262 263 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd); 264} 265 266/// ParseUsingDirective - Parse C++ using-directive, assumes 267/// that current token is 'namespace' and 'using' was already parsed. 268/// 269/// using-directive: [C++ 7.3.p4: namespace.udir] 270/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 271/// namespace-name ; 272/// [GNU] using-directive: 273/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 274/// namespace-name attributes[opt] ; 275/// 276Decl *Parser::ParseUsingDirective(unsigned Context, 277 SourceLocation UsingLoc, 278 SourceLocation &DeclEnd, 279 ParsedAttributes &attrs) { 280 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 281 282 // Eat 'namespace'. 283 SourceLocation NamespcLoc = ConsumeToken(); 284 285 if (Tok.is(tok::code_completion)) { 286 Actions.CodeCompleteUsingDirective(getCurScope()); 287 ConsumeCodeCompletionToken(); 288 } 289 290 CXXScopeSpec SS; 291 // Parse (optional) nested-name-specifier. 292 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 293 294 IdentifierInfo *NamespcName = 0; 295 SourceLocation IdentLoc = SourceLocation(); 296 297 // Parse namespace-name. 298 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 299 Diag(Tok, diag::err_expected_namespace_name); 300 // If there was invalid namespace name, skip to end of decl, and eat ';'. 301 SkipUntil(tok::semi); 302 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 303 return 0; 304 } 305 306 // Parse identifier. 307 NamespcName = Tok.getIdentifierInfo(); 308 IdentLoc = ConsumeToken(); 309 310 // Parse (optional) attributes (most likely GNU strong-using extension). 311 bool GNUAttr = false; 312 if (Tok.is(tok::kw___attribute)) { 313 GNUAttr = true; 314 ParseGNUAttributes(attrs); 315 } 316 317 // Eat ';'. 318 DeclEnd = Tok.getLocation(); 319 ExpectAndConsume(tok::semi, 320 GNUAttr ? diag::err_expected_semi_after_attribute_list 321 : diag::err_expected_semi_after_namespace_name, 322 "", tok::semi); 323 324 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 325 IdentLoc, NamespcName, attrs.getList()); 326} 327 328/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that 329/// 'using' was already seen. 330/// 331/// using-declaration: [C++ 7.3.p3: namespace.udecl] 332/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 333/// unqualified-id 334/// 'using' :: unqualified-id 335/// 336Decl *Parser::ParseUsingDeclaration(unsigned Context, 337 const ParsedTemplateInfo &TemplateInfo, 338 SourceLocation UsingLoc, 339 SourceLocation &DeclEnd, 340 AccessSpecifier AS) { 341 CXXScopeSpec SS; 342 SourceLocation TypenameLoc; 343 bool IsTypeName; 344 345 // TODO: in C++0x, if we have template parameters this must be a 346 // template alias: 347 // template <...> using id = type; 348 349 // Ignore optional 'typename'. 350 // FIXME: This is wrong; we should parse this as a typename-specifier. 351 if (Tok.is(tok::kw_typename)) { 352 TypenameLoc = Tok.getLocation(); 353 ConsumeToken(); 354 IsTypeName = true; 355 } 356 else 357 IsTypeName = false; 358 359 // Parse nested-name-specifier. 360 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 361 362 // Check nested-name specifier. 363 if (SS.isInvalid()) { 364 SkipUntil(tok::semi); 365 return 0; 366 } 367 368 // Parse the unqualified-id. We allow parsing of both constructor and 369 // destructor names and allow the action module to diagnose any semantic 370 // errors. 371 UnqualifiedId Name; 372 if (ParseUnqualifiedId(SS, 373 /*EnteringContext=*/false, 374 /*AllowDestructorName=*/true, 375 /*AllowConstructorName=*/true, 376 ParsedType(), 377 Name)) { 378 SkipUntil(tok::semi); 379 return 0; 380 } 381 382 // Parse (optional) attributes (most likely GNU strong-using extension). 383 ParsedAttributes attrs; 384 MaybeParseGNUAttributes(attrs); 385 386 // Eat ';'. 387 DeclEnd = Tok.getLocation(); 388 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 389 !attrs.empty() ? "attributes list" : "using declaration", 390 tok::semi); 391 392 // Diagnose an attempt to declare a templated using-declaration. 393 if (TemplateInfo.Kind) { 394 SourceRange R = TemplateInfo.getSourceRange(); 395 Diag(UsingLoc, diag::err_templated_using_declaration) 396 << R << FixItHint::CreateRemoval(R); 397 398 // Unfortunately, we have to bail out instead of recovering by 399 // ignoring the parameters, just in case the nested name specifier 400 // depends on the parameters. 401 return 0; 402 } 403 404 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 405 Name, attrs.getList(), 406 IsTypeName, TypenameLoc); 407} 408 409/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion. 410/// 411/// static_assert-declaration: 412/// static_assert ( constant-expression , string-literal ) ; 413/// 414Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 415 assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration"); 416 SourceLocation StaticAssertLoc = ConsumeToken(); 417 418 if (Tok.isNot(tok::l_paren)) { 419 Diag(Tok, diag::err_expected_lparen); 420 return 0; 421 } 422 423 SourceLocation LParenLoc = ConsumeParen(); 424 425 ExprResult AssertExpr(ParseConstantExpression()); 426 if (AssertExpr.isInvalid()) { 427 SkipUntil(tok::semi); 428 return 0; 429 } 430 431 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 432 return 0; 433 434 if (Tok.isNot(tok::string_literal)) { 435 Diag(Tok, diag::err_expected_string_literal); 436 SkipUntil(tok::semi); 437 return 0; 438 } 439 440 ExprResult AssertMessage(ParseStringLiteralExpression()); 441 if (AssertMessage.isInvalid()) 442 return 0; 443 444 MatchRHSPunctuation(tok::r_paren, LParenLoc); 445 446 DeclEnd = Tok.getLocation(); 447 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 448 449 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 450 AssertExpr.take(), 451 AssertMessage.take()); 452} 453 454/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 455/// 456/// 'decltype' ( expression ) 457/// 458void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 459 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 460 461 SourceLocation StartLoc = ConsumeToken(); 462 SourceLocation LParenLoc = Tok.getLocation(); 463 464 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 465 "decltype")) { 466 SkipUntil(tok::r_paren); 467 return; 468 } 469 470 // Parse the expression 471 472 // C++0x [dcl.type.simple]p4: 473 // The operand of the decltype specifier is an unevaluated operand. 474 EnterExpressionEvaluationContext Unevaluated(Actions, 475 Sema::Unevaluated); 476 ExprResult Result = ParseExpression(); 477 if (Result.isInvalid()) { 478 SkipUntil(tok::r_paren); 479 return; 480 } 481 482 // Match the ')' 483 SourceLocation RParenLoc; 484 if (Tok.is(tok::r_paren)) 485 RParenLoc = ConsumeParen(); 486 else 487 MatchRHSPunctuation(tok::r_paren, LParenLoc); 488 489 if (RParenLoc.isInvalid()) 490 return; 491 492 const char *PrevSpec = 0; 493 unsigned DiagID; 494 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 495 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 496 DiagID, Result.release())) 497 Diag(StartLoc, DiagID) << PrevSpec; 498} 499 500/// ParseClassName - Parse a C++ class-name, which names a class. Note 501/// that we only check that the result names a type; semantic analysis 502/// will need to verify that the type names a class. The result is 503/// either a type or NULL, depending on whether a type name was 504/// found. 505/// 506/// class-name: [C++ 9.1] 507/// identifier 508/// simple-template-id 509/// 510Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 511 CXXScopeSpec *SS) { 512 // Check whether we have a template-id that names a type. 513 if (Tok.is(tok::annot_template_id)) { 514 TemplateIdAnnotation *TemplateId 515 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 516 if (TemplateId->Kind == TNK_Type_template || 517 TemplateId->Kind == TNK_Dependent_template_name) { 518 AnnotateTemplateIdTokenAsType(SS); 519 520 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 521 ParsedType Type = getTypeAnnotation(Tok); 522 EndLocation = Tok.getAnnotationEndLoc(); 523 ConsumeToken(); 524 525 if (Type) 526 return Type; 527 return true; 528 } 529 530 // Fall through to produce an error below. 531 } 532 533 if (Tok.isNot(tok::identifier)) { 534 Diag(Tok, diag::err_expected_class_name); 535 return true; 536 } 537 538 IdentifierInfo *Id = Tok.getIdentifierInfo(); 539 SourceLocation IdLoc = ConsumeToken(); 540 541 if (Tok.is(tok::less)) { 542 // It looks the user intended to write a template-id here, but the 543 // template-name was wrong. Try to fix that. 544 TemplateNameKind TNK = TNK_Type_template; 545 TemplateTy Template; 546 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 547 SS, Template, TNK)) { 548 Diag(IdLoc, diag::err_unknown_template_name) 549 << Id; 550 } 551 552 if (!Template) 553 return true; 554 555 // Form the template name 556 UnqualifiedId TemplateName; 557 TemplateName.setIdentifier(Id, IdLoc); 558 559 // Parse the full template-id, then turn it into a type. 560 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 561 SourceLocation(), true)) 562 return true; 563 if (TNK == TNK_Dependent_template_name) 564 AnnotateTemplateIdTokenAsType(SS); 565 566 // If we didn't end up with a typename token, there's nothing more we 567 // can do. 568 if (Tok.isNot(tok::annot_typename)) 569 return true; 570 571 // Retrieve the type from the annotation token, consume that token, and 572 // return. 573 EndLocation = Tok.getAnnotationEndLoc(); 574 ParsedType Type = getTypeAnnotation(Tok); 575 ConsumeToken(); 576 return Type; 577 } 578 579 // We have an identifier; check whether it is actually a type. 580 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), SS, true); 581 if (!Type) { 582 Diag(IdLoc, diag::err_expected_class_name); 583 return true; 584 } 585 586 // Consume the identifier. 587 EndLocation = IdLoc; 588 589 // Fake up a Declarator to use with ActOnTypeName. 590 DeclSpec DS; 591 DS.SetRangeStart(IdLoc); 592 DS.SetRangeEnd(EndLocation); 593 DS.getTypeSpecScope() = *SS; 594 595 const char *PrevSpec = 0; 596 unsigned DiagID; 597 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 598 599 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 600 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 601} 602 603/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 604/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 605/// until we reach the start of a definition or see a token that 606/// cannot start a definition. If SuppressDeclarations is true, we do know. 607/// 608/// class-specifier: [C++ class] 609/// class-head '{' member-specification[opt] '}' 610/// class-head '{' member-specification[opt] '}' attributes[opt] 611/// class-head: 612/// class-key identifier[opt] base-clause[opt] 613/// class-key nested-name-specifier identifier base-clause[opt] 614/// class-key nested-name-specifier[opt] simple-template-id 615/// base-clause[opt] 616/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 617/// [GNU] class-key attributes[opt] nested-name-specifier 618/// identifier base-clause[opt] 619/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 620/// simple-template-id base-clause[opt] 621/// class-key: 622/// 'class' 623/// 'struct' 624/// 'union' 625/// 626/// elaborated-type-specifier: [C++ dcl.type.elab] 627/// class-key ::[opt] nested-name-specifier[opt] identifier 628/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 629/// simple-template-id 630/// 631/// Note that the C++ class-specifier and elaborated-type-specifier, 632/// together, subsume the C99 struct-or-union-specifier: 633/// 634/// struct-or-union-specifier: [C99 6.7.2.1] 635/// struct-or-union identifier[opt] '{' struct-contents '}' 636/// struct-or-union identifier 637/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 638/// '}' attributes[opt] 639/// [GNU] struct-or-union attributes[opt] identifier 640/// struct-or-union: 641/// 'struct' 642/// 'union' 643void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 644 SourceLocation StartLoc, DeclSpec &DS, 645 const ParsedTemplateInfo &TemplateInfo, 646 AccessSpecifier AS, bool SuppressDeclarations){ 647 DeclSpec::TST TagType; 648 if (TagTokKind == tok::kw_struct) 649 TagType = DeclSpec::TST_struct; 650 else if (TagTokKind == tok::kw_class) 651 TagType = DeclSpec::TST_class; 652 else { 653 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 654 TagType = DeclSpec::TST_union; 655 } 656 657 if (Tok.is(tok::code_completion)) { 658 // Code completion for a struct, class, or union name. 659 Actions.CodeCompleteTag(getCurScope(), TagType); 660 ConsumeCodeCompletionToken(); 661 } 662 663 // C++03 [temp.explicit] 14.7.2/8: 664 // The usual access checking rules do not apply to names used to specify 665 // explicit instantiations. 666 // 667 // As an extension we do not perform access checking on the names used to 668 // specify explicit specializations either. This is important to allow 669 // specializing traits classes for private types. 670 bool SuppressingAccessChecks = false; 671 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 672 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 673 Actions.ActOnStartSuppressingAccessChecks(); 674 SuppressingAccessChecks = true; 675 } 676 677 ParsedAttributes attrs; 678 // If attributes exist after tag, parse them. 679 if (Tok.is(tok::kw___attribute)) 680 ParseGNUAttributes(attrs); 681 682 // If declspecs exist after tag, parse them. 683 while (Tok.is(tok::kw___declspec)) 684 ParseMicrosoftDeclSpec(attrs); 685 686 // If C++0x attributes exist here, parse them. 687 // FIXME: Are we consistent with the ordering of parsing of different 688 // styles of attributes? 689 MaybeParseCXX0XAttributes(attrs); 690 691 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) { 692 // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but 693 // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the 694 // token sequence "struct __is_pod", make __is_pod into a normal 695 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 696 // properly. 697 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 698 Tok.setKind(tok::identifier); 699 } 700 701 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) { 702 // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but 703 // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the 704 // token sequence "struct __is_empty", make __is_empty into a normal 705 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 706 // properly. 707 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 708 Tok.setKind(tok::identifier); 709 } 710 711 // Parse the (optional) nested-name-specifier. 712 CXXScopeSpec &SS = DS.getTypeSpecScope(); 713 if (getLang().CPlusPlus) { 714 // "FOO : BAR" is not a potential typo for "FOO::BAR". 715 ColonProtectionRAIIObject X(*this); 716 717 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 718 DS.SetTypeSpecError(); 719 if (SS.isSet()) 720 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 721 Diag(Tok, diag::err_expected_ident); 722 } 723 724 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 725 726 // Parse the (optional) class name or simple-template-id. 727 IdentifierInfo *Name = 0; 728 SourceLocation NameLoc; 729 TemplateIdAnnotation *TemplateId = 0; 730 if (Tok.is(tok::identifier)) { 731 Name = Tok.getIdentifierInfo(); 732 NameLoc = ConsumeToken(); 733 734 if (Tok.is(tok::less) && getLang().CPlusPlus) { 735 // The name was supposed to refer to a template, but didn't. 736 // Eat the template argument list and try to continue parsing this as 737 // a class (or template thereof). 738 TemplateArgList TemplateArgs; 739 SourceLocation LAngleLoc, RAngleLoc; 740 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS, 741 true, LAngleLoc, 742 TemplateArgs, RAngleLoc)) { 743 // We couldn't parse the template argument list at all, so don't 744 // try to give any location information for the list. 745 LAngleLoc = RAngleLoc = SourceLocation(); 746 } 747 748 Diag(NameLoc, diag::err_explicit_spec_non_template) 749 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 750 << (TagType == DeclSpec::TST_class? 0 751 : TagType == DeclSpec::TST_struct? 1 752 : 2) 753 << Name 754 << SourceRange(LAngleLoc, RAngleLoc); 755 756 // Strip off the last template parameter list if it was empty, since 757 // we've removed its template argument list. 758 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 759 if (TemplateParams && TemplateParams->size() > 1) { 760 TemplateParams->pop_back(); 761 } else { 762 TemplateParams = 0; 763 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 764 = ParsedTemplateInfo::NonTemplate; 765 } 766 } else if (TemplateInfo.Kind 767 == ParsedTemplateInfo::ExplicitInstantiation) { 768 // Pretend this is just a forward declaration. 769 TemplateParams = 0; 770 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 771 = ParsedTemplateInfo::NonTemplate; 772 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 773 = SourceLocation(); 774 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 775 = SourceLocation(); 776 } 777 } 778 } else if (Tok.is(tok::annot_template_id)) { 779 TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 780 NameLoc = ConsumeToken(); 781 782 if (TemplateId->Kind != TNK_Type_template) { 783 // The template-name in the simple-template-id refers to 784 // something other than a class template. Give an appropriate 785 // error message and skip to the ';'. 786 SourceRange Range(NameLoc); 787 if (SS.isNotEmpty()) 788 Range.setBegin(SS.getBeginLoc()); 789 790 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 791 << Name << static_cast<int>(TemplateId->Kind) << Range; 792 793 DS.SetTypeSpecError(); 794 SkipUntil(tok::semi, false, true); 795 TemplateId->Destroy(); 796 if (SuppressingAccessChecks) 797 Actions.ActOnStopSuppressingAccessChecks(); 798 799 return; 800 } 801 } 802 803 // As soon as we're finished parsing the class's template-id, turn access 804 // checking back on. 805 if (SuppressingAccessChecks) 806 Actions.ActOnStopSuppressingAccessChecks(); 807 808 // There are four options here. If we have 'struct foo;', then this 809 // is either a forward declaration or a friend declaration, which 810 // have to be treated differently. If we have 'struct foo {...', 811 // 'struct foo :...' or 'struct foo <class-virt-specifier>' then this is a 812 // definition. Otherwise we have something like 'struct foo xyz', a reference. 813 // However, in some contexts, things look like declarations but are just 814 // references, e.g. 815 // new struct s; 816 // or 817 // &T::operator struct s; 818 // For these, SuppressDeclarations is true. 819 Sema::TagUseKind TUK; 820 if (SuppressDeclarations) 821 TUK = Sema::TUK_Reference; 822 else if (Tok.is(tok::l_brace) || 823 (getLang().CPlusPlus && Tok.is(tok::colon)) || 824 isCXX0XClassVirtSpecifier() != ClassVirtSpecifiers::CVS_None) { 825 if (DS.isFriendSpecified()) { 826 // C++ [class.friend]p2: 827 // A class shall not be defined in a friend declaration. 828 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 829 << SourceRange(DS.getFriendSpecLoc()); 830 831 // Skip everything up to the semicolon, so that this looks like a proper 832 // friend class (or template thereof) declaration. 833 SkipUntil(tok::semi, true, true); 834 TUK = Sema::TUK_Friend; 835 } else { 836 // Okay, this is a class definition. 837 TUK = Sema::TUK_Definition; 838 } 839 } else if (Tok.is(tok::semi)) 840 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 841 else 842 TUK = Sema::TUK_Reference; 843 844 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 845 TUK != Sema::TUK_Definition)) { 846 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 847 // We have a declaration or reference to an anonymous class. 848 Diag(StartLoc, diag::err_anon_type_definition) 849 << DeclSpec::getSpecifierName(TagType); 850 } 851 852 SkipUntil(tok::comma, true); 853 854 if (TemplateId) 855 TemplateId->Destroy(); 856 return; 857 } 858 859 // Create the tag portion of the class or class template. 860 DeclResult TagOrTempResult = true; // invalid 861 TypeResult TypeResult = true; // invalid 862 863 bool Owned = false; 864 if (TemplateId) { 865 // Explicit specialization, class template partial specialization, 866 // or explicit instantiation. 867 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 868 TemplateId->getTemplateArgs(), 869 TemplateId->NumArgs); 870 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 871 TUK == Sema::TUK_Declaration) { 872 // This is an explicit instantiation of a class template. 873 TagOrTempResult 874 = Actions.ActOnExplicitInstantiation(getCurScope(), 875 TemplateInfo.ExternLoc, 876 TemplateInfo.TemplateLoc, 877 TagType, 878 StartLoc, 879 SS, 880 TemplateId->Template, 881 TemplateId->TemplateNameLoc, 882 TemplateId->LAngleLoc, 883 TemplateArgsPtr, 884 TemplateId->RAngleLoc, 885 attrs.getList()); 886 887 // Friend template-ids are treated as references unless 888 // they have template headers, in which case they're ill-formed 889 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 890 // We diagnose this error in ActOnClassTemplateSpecialization. 891 } else if (TUK == Sema::TUK_Reference || 892 (TUK == Sema::TUK_Friend && 893 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 894 TypeResult 895 = Actions.ActOnTemplateIdType(TemplateId->Template, 896 TemplateId->TemplateNameLoc, 897 TemplateId->LAngleLoc, 898 TemplateArgsPtr, 899 TemplateId->RAngleLoc); 900 901 TypeResult = Actions.ActOnTagTemplateIdType(SS, TypeResult, TUK, 902 TagType, StartLoc); 903 } else { 904 // This is an explicit specialization or a class template 905 // partial specialization. 906 TemplateParameterLists FakedParamLists; 907 908 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 909 // This looks like an explicit instantiation, because we have 910 // something like 911 // 912 // template class Foo<X> 913 // 914 // but it actually has a definition. Most likely, this was 915 // meant to be an explicit specialization, but the user forgot 916 // the '<>' after 'template'. 917 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 918 919 SourceLocation LAngleLoc 920 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 921 Diag(TemplateId->TemplateNameLoc, 922 diag::err_explicit_instantiation_with_definition) 923 << SourceRange(TemplateInfo.TemplateLoc) 924 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 925 926 // Create a fake template parameter list that contains only 927 // "template<>", so that we treat this construct as a class 928 // template specialization. 929 FakedParamLists.push_back( 930 Actions.ActOnTemplateParameterList(0, SourceLocation(), 931 TemplateInfo.TemplateLoc, 932 LAngleLoc, 933 0, 0, 934 LAngleLoc)); 935 TemplateParams = &FakedParamLists; 936 } 937 938 // Build the class template specialization. 939 TagOrTempResult 940 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 941 StartLoc, SS, 942 TemplateId->Template, 943 TemplateId->TemplateNameLoc, 944 TemplateId->LAngleLoc, 945 TemplateArgsPtr, 946 TemplateId->RAngleLoc, 947 attrs.getList(), 948 MultiTemplateParamsArg(Actions, 949 TemplateParams? &(*TemplateParams)[0] : 0, 950 TemplateParams? TemplateParams->size() : 0)); 951 } 952 TemplateId->Destroy(); 953 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 954 TUK == Sema::TUK_Declaration) { 955 // Explicit instantiation of a member of a class template 956 // specialization, e.g., 957 // 958 // template struct Outer<int>::Inner; 959 // 960 TagOrTempResult 961 = Actions.ActOnExplicitInstantiation(getCurScope(), 962 TemplateInfo.ExternLoc, 963 TemplateInfo.TemplateLoc, 964 TagType, StartLoc, SS, Name, 965 NameLoc, attrs.getList()); 966 } else if (TUK == Sema::TUK_Friend && 967 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 968 TagOrTempResult = 969 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 970 TagType, StartLoc, SS, 971 Name, NameLoc, attrs.getList(), 972 MultiTemplateParamsArg(Actions, 973 TemplateParams? &(*TemplateParams)[0] : 0, 974 TemplateParams? TemplateParams->size() : 0)); 975 } else { 976 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 977 TUK == Sema::TUK_Definition) { 978 // FIXME: Diagnose this particular error. 979 } 980 981 bool IsDependent = false; 982 983 // Don't pass down template parameter lists if this is just a tag 984 // reference. For example, we don't need the template parameters here: 985 // template <class T> class A *makeA(T t); 986 MultiTemplateParamsArg TParams; 987 if (TUK != Sema::TUK_Reference && TemplateParams) 988 TParams = 989 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 990 991 // Declaration or definition of a class type 992 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 993 SS, Name, NameLoc, attrs.getList(), AS, 994 TParams, Owned, IsDependent, false, 995 false, clang::TypeResult()); 996 997 // If ActOnTag said the type was dependent, try again with the 998 // less common call. 999 if (IsDependent) { 1000 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1001 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1002 SS, Name, StartLoc, NameLoc); 1003 } 1004 } 1005 1006 // If there is a body, parse it and inform the actions module. 1007 if (TUK == Sema::TUK_Definition) { 1008 assert(Tok.is(tok::l_brace) || 1009 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1010 isCXX0XClassVirtSpecifier() != ClassVirtSpecifiers::CVS_None); 1011 if (getLang().CPlusPlus) 1012 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1013 else 1014 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1015 } 1016 1017 // FIXME: The DeclSpec should keep the locations of both the keyword and the 1018 // name (if there is one). 1019 SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc; 1020 1021 const char *PrevSpec = 0; 1022 unsigned DiagID; 1023 bool Result; 1024 if (!TypeResult.isInvalid()) { 1025 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, TSTLoc, 1026 PrevSpec, DiagID, TypeResult.get()); 1027 } else if (!TagOrTempResult.isInvalid()) { 1028 Result = DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID, 1029 TagOrTempResult.get(), Owned); 1030 } else { 1031 DS.SetTypeSpecError(); 1032 return; 1033 } 1034 1035 if (Result) 1036 Diag(StartLoc, DiagID) << PrevSpec; 1037 1038 // At this point, we've successfully parsed a class-specifier in 'definition' 1039 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1040 // going to look at what comes after it to improve error recovery. If an 1041 // impossible token occurs next, we assume that the programmer forgot a ; at 1042 // the end of the declaration and recover that way. 1043 // 1044 // This switch enumerates the valid "follow" set for definition. 1045 if (TUK == Sema::TUK_Definition) { 1046 bool ExpectedSemi = true; 1047 switch (Tok.getKind()) { 1048 default: break; 1049 case tok::semi: // struct foo {...} ; 1050 case tok::star: // struct foo {...} * P; 1051 case tok::amp: // struct foo {...} & R = ... 1052 case tok::identifier: // struct foo {...} V ; 1053 case tok::r_paren: //(struct foo {...} ) {4} 1054 case tok::annot_cxxscope: // struct foo {...} a:: b; 1055 case tok::annot_typename: // struct foo {...} a ::b; 1056 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1057 case tok::l_paren: // struct foo {...} ( x); 1058 case tok::comma: // __builtin_offsetof(struct foo{...} , 1059 ExpectedSemi = false; 1060 break; 1061 // Type qualifiers 1062 case tok::kw_const: // struct foo {...} const x; 1063 case tok::kw_volatile: // struct foo {...} volatile x; 1064 case tok::kw_restrict: // struct foo {...} restrict x; 1065 case tok::kw_inline: // struct foo {...} inline foo() {}; 1066 // Storage-class specifiers 1067 case tok::kw_static: // struct foo {...} static x; 1068 case tok::kw_extern: // struct foo {...} extern x; 1069 case tok::kw_typedef: // struct foo {...} typedef x; 1070 case tok::kw_register: // struct foo {...} register x; 1071 case tok::kw_auto: // struct foo {...} auto x; 1072 case tok::kw_mutable: // struct foo {...} mutable x; 1073 // As shown above, type qualifiers and storage class specifiers absolutely 1074 // can occur after class specifiers according to the grammar. However, 1075 // almost noone actually writes code like this. If we see one of these, 1076 // it is much more likely that someone missed a semi colon and the 1077 // type/storage class specifier we're seeing is part of the *next* 1078 // intended declaration, as in: 1079 // 1080 // struct foo { ... } 1081 // typedef int X; 1082 // 1083 // We'd really like to emit a missing semicolon error instead of emitting 1084 // an error on the 'int' saying that you can't have two type specifiers in 1085 // the same declaration of X. Because of this, we look ahead past this 1086 // token to see if it's a type specifier. If so, we know the code is 1087 // otherwise invalid, so we can produce the expected semi error. 1088 if (!isKnownToBeTypeSpecifier(NextToken())) 1089 ExpectedSemi = false; 1090 break; 1091 1092 case tok::r_brace: // struct bar { struct foo {...} } 1093 // Missing ';' at end of struct is accepted as an extension in C mode. 1094 if (!getLang().CPlusPlus) 1095 ExpectedSemi = false; 1096 break; 1097 } 1098 1099 if (ExpectedSemi) { 1100 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1101 TagType == DeclSpec::TST_class ? "class" 1102 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1103 // Push this token back into the preprocessor and change our current token 1104 // to ';' so that the rest of the code recovers as though there were an 1105 // ';' after the definition. 1106 PP.EnterToken(Tok); 1107 Tok.setKind(tok::semi); 1108 } 1109 } 1110} 1111 1112/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1113/// 1114/// base-clause : [C++ class.derived] 1115/// ':' base-specifier-list 1116/// base-specifier-list: 1117/// base-specifier '...'[opt] 1118/// base-specifier-list ',' base-specifier '...'[opt] 1119void Parser::ParseBaseClause(Decl *ClassDecl) { 1120 assert(Tok.is(tok::colon) && "Not a base clause"); 1121 ConsumeToken(); 1122 1123 // Build up an array of parsed base specifiers. 1124 llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1125 1126 while (true) { 1127 // Parse a base-specifier. 1128 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1129 if (Result.isInvalid()) { 1130 // Skip the rest of this base specifier, up until the comma or 1131 // opening brace. 1132 SkipUntil(tok::comma, tok::l_brace, true, true); 1133 } else { 1134 // Add this to our array of base specifiers. 1135 BaseInfo.push_back(Result.get()); 1136 } 1137 1138 // If the next token is a comma, consume it and keep reading 1139 // base-specifiers. 1140 if (Tok.isNot(tok::comma)) break; 1141 1142 // Consume the comma. 1143 ConsumeToken(); 1144 } 1145 1146 // Attach the base specifiers 1147 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1148} 1149 1150/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1151/// one entry in the base class list of a class specifier, for example: 1152/// class foo : public bar, virtual private baz { 1153/// 'public bar' and 'virtual private baz' are each base-specifiers. 1154/// 1155/// base-specifier: [C++ class.derived] 1156/// ::[opt] nested-name-specifier[opt] class-name 1157/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1158/// class-name 1159/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1160/// class-name 1161Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1162 bool IsVirtual = false; 1163 SourceLocation StartLoc = Tok.getLocation(); 1164 1165 // Parse the 'virtual' keyword. 1166 if (Tok.is(tok::kw_virtual)) { 1167 ConsumeToken(); 1168 IsVirtual = true; 1169 } 1170 1171 // Parse an (optional) access specifier. 1172 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1173 if (Access != AS_none) 1174 ConsumeToken(); 1175 1176 // Parse the 'virtual' keyword (again!), in case it came after the 1177 // access specifier. 1178 if (Tok.is(tok::kw_virtual)) { 1179 SourceLocation VirtualLoc = ConsumeToken(); 1180 if (IsVirtual) { 1181 // Complain about duplicate 'virtual' 1182 Diag(VirtualLoc, diag::err_dup_virtual) 1183 << FixItHint::CreateRemoval(VirtualLoc); 1184 } 1185 1186 IsVirtual = true; 1187 } 1188 1189 // Parse optional '::' and optional nested-name-specifier. 1190 CXXScopeSpec SS; 1191 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1192 1193 // The location of the base class itself. 1194 SourceLocation BaseLoc = Tok.getLocation(); 1195 1196 // Parse the class-name. 1197 SourceLocation EndLocation; 1198 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1199 if (BaseType.isInvalid()) 1200 return true; 1201 1202 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1203 // actually part of the base-specifier-list grammar productions, but we 1204 // parse it here for convenience. 1205 SourceLocation EllipsisLoc; 1206 if (Tok.is(tok::ellipsis)) 1207 EllipsisLoc = ConsumeToken(); 1208 1209 // Find the complete source range for the base-specifier. 1210 SourceRange Range(StartLoc, EndLocation); 1211 1212 // Notify semantic analysis that we have parsed a complete 1213 // base-specifier. 1214 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1215 BaseType.get(), BaseLoc, EllipsisLoc); 1216} 1217 1218/// getAccessSpecifierIfPresent - Determine whether the next token is 1219/// a C++ access-specifier. 1220/// 1221/// access-specifier: [C++ class.derived] 1222/// 'private' 1223/// 'protected' 1224/// 'public' 1225AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1226 switch (Tok.getKind()) { 1227 default: return AS_none; 1228 case tok::kw_private: return AS_private; 1229 case tok::kw_protected: return AS_protected; 1230 case tok::kw_public: return AS_public; 1231 } 1232} 1233 1234void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1235 Decl *ThisDecl) { 1236 // We just declared a member function. If this member function 1237 // has any default arguments, we'll need to parse them later. 1238 LateParsedMethodDeclaration *LateMethod = 0; 1239 DeclaratorChunk::FunctionTypeInfo &FTI 1240 = DeclaratorInfo.getFunctionTypeInfo(); 1241 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1242 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1243 if (!LateMethod) { 1244 // Push this method onto the stack of late-parsed method 1245 // declarations. 1246 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1247 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1248 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1249 1250 // Add all of the parameters prior to this one (they don't 1251 // have default arguments). 1252 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1253 for (unsigned I = 0; I < ParamIdx; ++I) 1254 LateMethod->DefaultArgs.push_back( 1255 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1256 } 1257 1258 // Add this parameter to the list of parameters (it or may 1259 // not have a default argument). 1260 LateMethod->DefaultArgs.push_back( 1261 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1262 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1263 } 1264 } 1265} 1266 1267/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1268/// virt-specifier. 1269/// 1270/// virt-specifier: 1271/// override 1272/// final 1273/// new 1274VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1275 if (!getLang().CPlusPlus) 1276 return VirtSpecifiers::VS_None; 1277 1278 if (Tok.is(tok::kw_new)) 1279 return VirtSpecifiers::VS_New; 1280 1281 if (Tok.is(tok::identifier)) { 1282 IdentifierInfo *II = Tok.getIdentifierInfo(); 1283 1284 // Initialize the contextual keywords. 1285 if (!Ident_final) { 1286 Ident_final = &PP.getIdentifierTable().get("final"); 1287 Ident_override = &PP.getIdentifierTable().get("override"); 1288 } 1289 1290 if (II == Ident_override) 1291 return VirtSpecifiers::VS_Override; 1292 1293 if (II == Ident_final) 1294 return VirtSpecifiers::VS_Final; 1295 } 1296 1297 return VirtSpecifiers::VS_None; 1298} 1299 1300/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1301/// 1302/// virt-specifier-seq: 1303/// virt-specifier 1304/// virt-specifier-seq virt-specifier 1305void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1306 while (true) { 1307 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1308 if (Specifier == VirtSpecifiers::VS_None) 1309 return; 1310 1311 // C++ [class.mem]p8: 1312 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1313 const char *PrevSpec = 0; 1314 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1315 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1316 << PrevSpec 1317 << FixItHint::CreateRemoval(Tok.getLocation()); 1318 1319 if (!getLang().CPlusPlus0x) 1320 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1321 << VirtSpecifiers::getSpecifierName(Specifier); 1322 ConsumeToken(); 1323 } 1324} 1325 1326/// isCXX0XClassVirtSpecifier - Determine whether the next token is a C++0x 1327/// class-virt-specifier. 1328/// 1329/// class-virt-specifier: 1330/// final 1331/// explicit 1332ClassVirtSpecifiers::Specifier Parser::isCXX0XClassVirtSpecifier() const { 1333 if (!getLang().CPlusPlus) 1334 return ClassVirtSpecifiers::CVS_None; 1335 1336 if (Tok.is(tok::kw_explicit)) 1337 return ClassVirtSpecifiers::CVS_Explicit; 1338 1339 if (Tok.is(tok::identifier)) { 1340 IdentifierInfo *II = Tok.getIdentifierInfo(); 1341 1342 // Initialize the contextual keywords. 1343 if (!Ident_final) { 1344 Ident_final = &PP.getIdentifierTable().get("final"); 1345 Ident_override = &PP.getIdentifierTable().get("override"); 1346 } 1347 1348 if (II == Ident_final) 1349 return ClassVirtSpecifiers::CVS_Final; 1350 } 1351 1352 return ClassVirtSpecifiers::CVS_None; 1353} 1354 1355/// ParseOptionalCXX0XClassVirtSpecifierSeq - Parse a class-virt-specifier-seq. 1356/// 1357/// class-virt-specifier-seq: 1358/// class-virt-specifier 1359/// class-virt-specifier-seq class-virt-specifier 1360void Parser::ParseOptionalCXX0XClassVirtSpecifierSeq(ClassVirtSpecifiers &CVS) { 1361 while (true) { 1362 ClassVirtSpecifiers::Specifier Specifier = isCXX0XClassVirtSpecifier(); 1363 if (Specifier == ClassVirtSpecifiers::CVS_None) 1364 return; 1365 1366 // C++ [class]p1: 1367 // A class-virt-specifier-seq shall contain at most one of each 1368 // class-virt-specifier. 1369 const char *PrevSpec = 0; 1370 if (CVS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1371 Diag(Tok.getLocation(), diag::err_duplicate_class_virt_specifier) 1372 << PrevSpec 1373 << FixItHint::CreateRemoval(Tok.getLocation()); 1374 1375 if (!getLang().CPlusPlus0x) 1376 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1377 << ClassVirtSpecifiers::getSpecifierName(Specifier); 1378 1379 ConsumeToken(); 1380 } 1381} 1382 1383/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1384/// 1385/// member-declaration: 1386/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1387/// function-definition ';'[opt] 1388/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1389/// using-declaration [TODO] 1390/// [C++0x] static_assert-declaration 1391/// template-declaration 1392/// [GNU] '__extension__' member-declaration 1393/// 1394/// member-declarator-list: 1395/// member-declarator 1396/// member-declarator-list ',' member-declarator 1397/// 1398/// member-declarator: 1399/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1400/// declarator constant-initializer[opt] 1401/// identifier[opt] ':' constant-expression 1402/// 1403/// virt-specifier-seq: 1404/// virt-specifier 1405/// virt-specifier-seq virt-specifier 1406/// 1407/// virt-specifier: 1408/// override 1409/// final 1410/// new 1411/// 1412/// pure-specifier: 1413/// '= 0' 1414/// 1415/// constant-initializer: 1416/// '=' constant-expression 1417/// 1418void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1419 const ParsedTemplateInfo &TemplateInfo, 1420 ParsingDeclRAIIObject *TemplateDiags) { 1421 // Access declarations. 1422 if (!TemplateInfo.Kind && 1423 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1424 !TryAnnotateCXXScopeToken() && 1425 Tok.is(tok::annot_cxxscope)) { 1426 bool isAccessDecl = false; 1427 if (NextToken().is(tok::identifier)) 1428 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1429 else 1430 isAccessDecl = NextToken().is(tok::kw_operator); 1431 1432 if (isAccessDecl) { 1433 // Collect the scope specifier token we annotated earlier. 1434 CXXScopeSpec SS; 1435 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1436 1437 // Try to parse an unqualified-id. 1438 UnqualifiedId Name; 1439 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1440 SkipUntil(tok::semi); 1441 return; 1442 } 1443 1444 // TODO: recover from mistakenly-qualified operator declarations. 1445 if (ExpectAndConsume(tok::semi, 1446 diag::err_expected_semi_after, 1447 "access declaration", 1448 tok::semi)) 1449 return; 1450 1451 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1452 false, SourceLocation(), 1453 SS, Name, 1454 /* AttrList */ 0, 1455 /* IsTypeName */ false, 1456 SourceLocation()); 1457 return; 1458 } 1459 } 1460 1461 // static_assert-declaration 1462 if (Tok.is(tok::kw_static_assert)) { 1463 // FIXME: Check for templates 1464 SourceLocation DeclEnd; 1465 ParseStaticAssertDeclaration(DeclEnd); 1466 return; 1467 } 1468 1469 if (Tok.is(tok::kw_template)) { 1470 assert(!TemplateInfo.TemplateParams && 1471 "Nested template improperly parsed?"); 1472 SourceLocation DeclEnd; 1473 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1474 AS); 1475 return; 1476 } 1477 1478 // Handle: member-declaration ::= '__extension__' member-declaration 1479 if (Tok.is(tok::kw___extension__)) { 1480 // __extension__ silences extension warnings in the subexpression. 1481 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1482 ConsumeToken(); 1483 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1484 } 1485 1486 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1487 // is a bitfield. 1488 ColonProtectionRAIIObject X(*this); 1489 1490 ParsedAttributesWithRange attrs; 1491 // Optional C++0x attribute-specifier 1492 MaybeParseCXX0XAttributes(attrs); 1493 MaybeParseMicrosoftAttributes(attrs); 1494 1495 if (Tok.is(tok::kw_using)) { 1496 // FIXME: Check for template aliases 1497 1498 ProhibitAttributes(attrs); 1499 1500 // Eat 'using'. 1501 SourceLocation UsingLoc = ConsumeToken(); 1502 1503 if (Tok.is(tok::kw_namespace)) { 1504 Diag(UsingLoc, diag::err_using_namespace_in_class); 1505 SkipUntil(tok::semi, true, true); 1506 } else { 1507 SourceLocation DeclEnd; 1508 // Otherwise, it must be using-declaration. 1509 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1510 UsingLoc, DeclEnd, AS); 1511 } 1512 return; 1513 } 1514 1515 // decl-specifier-seq: 1516 // Parse the common declaration-specifiers piece. 1517 ParsingDeclSpec DS(*this, TemplateDiags); 1518 DS.takeAttributesFrom(attrs); 1519 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1520 1521 MultiTemplateParamsArg TemplateParams(Actions, 1522 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1523 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1524 1525 if (Tok.is(tok::semi)) { 1526 ConsumeToken(); 1527 Decl *TheDecl = 1528 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 1529 DS.complete(TheDecl); 1530 return; 1531 } 1532 1533 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1534 1535 if (Tok.isNot(tok::colon)) { 1536 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1537 ColonProtectionRAIIObject X(*this); 1538 1539 // Parse the first declarator. 1540 ParseDeclarator(DeclaratorInfo); 1541 // Error parsing the declarator? 1542 if (!DeclaratorInfo.hasName()) { 1543 // If so, skip until the semi-colon or a }. 1544 SkipUntil(tok::r_brace, true); 1545 if (Tok.is(tok::semi)) 1546 ConsumeToken(); 1547 return; 1548 } 1549 1550 // If attributes exist after the declarator, but before an '{', parse them. 1551 MaybeParseGNUAttributes(DeclaratorInfo); 1552 1553 // function-definition: 1554 if (Tok.is(tok::l_brace) 1555 || (DeclaratorInfo.isFunctionDeclarator() && 1556 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1557 if (!DeclaratorInfo.isFunctionDeclarator()) { 1558 Diag(Tok, diag::err_func_def_no_params); 1559 ConsumeBrace(); 1560 SkipUntil(tok::r_brace, true); 1561 1562 // Consume the optional ';' 1563 if (Tok.is(tok::semi)) 1564 ConsumeToken(); 1565 return; 1566 } 1567 1568 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1569 Diag(Tok, diag::err_function_declared_typedef); 1570 // This recovery skips the entire function body. It would be nice 1571 // to simply call ParseCXXInlineMethodDef() below, however Sema 1572 // assumes the declarator represents a function, not a typedef. 1573 ConsumeBrace(); 1574 SkipUntil(tok::r_brace, true); 1575 1576 // Consume the optional ';' 1577 if (Tok.is(tok::semi)) 1578 ConsumeToken(); 1579 return; 1580 } 1581 1582 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1583 // Consume the optional ';' 1584 if (Tok.is(tok::semi)) 1585 ConsumeToken(); 1586 1587 return; 1588 } 1589 } 1590 1591 // member-declarator-list: 1592 // member-declarator 1593 // member-declarator-list ',' member-declarator 1594 1595 llvm::SmallVector<Decl *, 8> DeclsInGroup; 1596 ExprResult BitfieldSize; 1597 ExprResult Init; 1598 bool Deleted = false; 1599 1600 while (1) { 1601 // member-declarator: 1602 // declarator pure-specifier[opt] 1603 // declarator constant-initializer[opt] 1604 // identifier[opt] ':' constant-expression 1605 if (Tok.is(tok::colon)) { 1606 ConsumeToken(); 1607 BitfieldSize = ParseConstantExpression(); 1608 if (BitfieldSize.isInvalid()) 1609 SkipUntil(tok::comma, true, true); 1610 } 1611 1612 VirtSpecifiers VS; 1613 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1614 1615 // pure-specifier: 1616 // '= 0' 1617 // 1618 // constant-initializer: 1619 // '=' constant-expression 1620 // 1621 // defaulted/deleted function-definition: 1622 // '=' 'default' [TODO] 1623 // '=' 'delete' 1624 if (Tok.is(tok::equal)) { 1625 ConsumeToken(); 1626 if (Tok.is(tok::kw_delete)) { 1627 if (!getLang().CPlusPlus0x) 1628 Diag(Tok, diag::warn_deleted_function_accepted_as_extension); 1629 ConsumeToken(); 1630 Deleted = true; 1631 } else { 1632 Init = ParseInitializer(); 1633 if (Init.isInvalid()) 1634 SkipUntil(tok::comma, true, true); 1635 } 1636 } 1637 1638 // If a simple-asm-expr is present, parse it. 1639 if (Tok.is(tok::kw_asm)) { 1640 SourceLocation Loc; 1641 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1642 if (AsmLabel.isInvalid()) 1643 SkipUntil(tok::comma, true, true); 1644 1645 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1646 DeclaratorInfo.SetRangeEnd(Loc); 1647 } 1648 1649 // If attributes exist after the declarator, parse them. 1650 MaybeParseGNUAttributes(DeclaratorInfo); 1651 1652 // NOTE: If Sema is the Action module and declarator is an instance field, 1653 // this call will *not* return the created decl; It will return null. 1654 // See Sema::ActOnCXXMemberDeclarator for details. 1655 1656 Decl *ThisDecl = 0; 1657 if (DS.isFriendSpecified()) { 1658 // TODO: handle initializers, bitfields, 'delete' 1659 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1660 /*IsDefinition*/ false, 1661 move(TemplateParams)); 1662 } else { 1663 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1664 DeclaratorInfo, 1665 move(TemplateParams), 1666 BitfieldSize.release(), 1667 VS, Init.release(), 1668 /*IsDefinition*/Deleted, 1669 Deleted); 1670 } 1671 if (ThisDecl) 1672 DeclsInGroup.push_back(ThisDecl); 1673 1674 if (DeclaratorInfo.isFunctionDeclarator() && 1675 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1676 != DeclSpec::SCS_typedef) { 1677 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1678 } 1679 1680 DeclaratorInfo.complete(ThisDecl); 1681 1682 // If we don't have a comma, it is either the end of the list (a ';') 1683 // or an error, bail out. 1684 if (Tok.isNot(tok::comma)) 1685 break; 1686 1687 // Consume the comma. 1688 ConsumeToken(); 1689 1690 // Parse the next declarator. 1691 DeclaratorInfo.clear(); 1692 BitfieldSize = 0; 1693 Init = 0; 1694 Deleted = false; 1695 1696 // Attributes are only allowed on the second declarator. 1697 MaybeParseGNUAttributes(DeclaratorInfo); 1698 1699 if (Tok.isNot(tok::colon)) 1700 ParseDeclarator(DeclaratorInfo); 1701 } 1702 1703 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1704 // Skip to end of block or statement. 1705 SkipUntil(tok::r_brace, true, true); 1706 // If we stopped at a ';', eat it. 1707 if (Tok.is(tok::semi)) ConsumeToken(); 1708 return; 1709 } 1710 1711 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1712 DeclsInGroup.size()); 1713} 1714 1715/// ParseCXXMemberSpecification - Parse the class definition. 1716/// 1717/// member-specification: 1718/// member-declaration member-specification[opt] 1719/// access-specifier ':' member-specification[opt] 1720/// 1721void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1722 unsigned TagType, Decl *TagDecl) { 1723 assert((TagType == DeclSpec::TST_struct || 1724 TagType == DeclSpec::TST_union || 1725 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1726 1727 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 1728 "parsing struct/union/class body"); 1729 1730 // Determine whether this is a non-nested class. Note that local 1731 // classes are *not* considered to be nested classes. 1732 bool NonNestedClass = true; 1733 if (!ClassStack.empty()) { 1734 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 1735 if (S->isClassScope()) { 1736 // We're inside a class scope, so this is a nested class. 1737 NonNestedClass = false; 1738 break; 1739 } 1740 1741 if ((S->getFlags() & Scope::FnScope)) { 1742 // If we're in a function or function template declared in the 1743 // body of a class, then this is a local class rather than a 1744 // nested class. 1745 const Scope *Parent = S->getParent(); 1746 if (Parent->isTemplateParamScope()) 1747 Parent = Parent->getParent(); 1748 if (Parent->isClassScope()) 1749 break; 1750 } 1751 } 1752 } 1753 1754 // Enter a scope for the class. 1755 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1756 1757 // Note that we are parsing a new (potentially-nested) class definition. 1758 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1759 1760 if (TagDecl) 1761 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 1762 1763 ClassVirtSpecifiers CVS; 1764 ParseOptionalCXX0XClassVirtSpecifierSeq(CVS); 1765 1766 if (Tok.is(tok::colon)) { 1767 ParseBaseClause(TagDecl); 1768 1769 if (!Tok.is(tok::l_brace)) { 1770 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1771 1772 if (TagDecl) 1773 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 1774 return; 1775 } 1776 } 1777 1778 assert(Tok.is(tok::l_brace)); 1779 1780 SourceLocation LBraceLoc = ConsumeBrace(); 1781 1782 if (TagDecl) 1783 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, CVS, 1784 LBraceLoc); 1785 1786 // C++ 11p3: Members of a class defined with the keyword class are private 1787 // by default. Members of a class defined with the keywords struct or union 1788 // are public by default. 1789 AccessSpecifier CurAS; 1790 if (TagType == DeclSpec::TST_class) 1791 CurAS = AS_private; 1792 else 1793 CurAS = AS_public; 1794 1795 SourceLocation RBraceLoc; 1796 if (TagDecl) { 1797 // While we still have something to read, read the member-declarations. 1798 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1799 // Each iteration of this loop reads one member-declaration. 1800 1801 // Check for extraneous top-level semicolon. 1802 if (Tok.is(tok::semi)) { 1803 Diag(Tok, diag::ext_extra_struct_semi) 1804 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 1805 << FixItHint::CreateRemoval(Tok.getLocation()); 1806 ConsumeToken(); 1807 continue; 1808 } 1809 1810 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1811 if (AS != AS_none) { 1812 // Current token is a C++ access specifier. 1813 CurAS = AS; 1814 SourceLocation ASLoc = Tok.getLocation(); 1815 ConsumeToken(); 1816 if (Tok.is(tok::colon)) 1817 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 1818 else 1819 Diag(Tok, diag::err_expected_colon); 1820 ConsumeToken(); 1821 continue; 1822 } 1823 1824 // FIXME: Make sure we don't have a template here. 1825 1826 // Parse all the comma separated declarators. 1827 ParseCXXClassMemberDeclaration(CurAS); 1828 } 1829 1830 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1831 } else { 1832 SkipUntil(tok::r_brace, false, false); 1833 } 1834 1835 // If attributes exist after class contents, parse them. 1836 ParsedAttributes attrs; 1837 MaybeParseGNUAttributes(attrs); 1838 1839 if (TagDecl) 1840 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 1841 LBraceLoc, RBraceLoc, 1842 attrs.getList()); 1843 1844 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1845 // complete within function bodies, default arguments, 1846 // exception-specifications, and constructor ctor-initializers (including 1847 // such things in nested classes). 1848 // 1849 // FIXME: Only function bodies and constructor ctor-initializers are 1850 // parsed correctly, fix the rest. 1851 if (TagDecl && NonNestedClass) { 1852 // We are not inside a nested class. This class and its nested classes 1853 // are complete and we can parse the delayed portions of method 1854 // declarations and the lexed inline method definitions. 1855 SourceLocation SavedPrevTokLocation = PrevTokLocation; 1856 ParseLexedMethodDeclarations(getCurrentClass()); 1857 ParseLexedMethodDefs(getCurrentClass()); 1858 PrevTokLocation = SavedPrevTokLocation; 1859 } 1860 1861 if (TagDecl) 1862 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 1863 1864 // Leave the class scope. 1865 ParsingDef.Pop(); 1866 ClassScope.Exit(); 1867} 1868 1869/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1870/// which explicitly initializes the members or base classes of a 1871/// class (C++ [class.base.init]). For example, the three initializers 1872/// after the ':' in the Derived constructor below: 1873/// 1874/// @code 1875/// class Base { }; 1876/// class Derived : Base { 1877/// int x; 1878/// float f; 1879/// public: 1880/// Derived(float f) : Base(), x(17), f(f) { } 1881/// }; 1882/// @endcode 1883/// 1884/// [C++] ctor-initializer: 1885/// ':' mem-initializer-list 1886/// 1887/// [C++] mem-initializer-list: 1888/// mem-initializer ...[opt] 1889/// mem-initializer ...[opt] , mem-initializer-list 1890void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 1891 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1892 1893 SourceLocation ColonLoc = ConsumeToken(); 1894 1895 llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers; 1896 bool AnyErrors = false; 1897 1898 do { 1899 if (Tok.is(tok::code_completion)) { 1900 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 1901 MemInitializers.data(), 1902 MemInitializers.size()); 1903 ConsumeCodeCompletionToken(); 1904 } else { 1905 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1906 if (!MemInit.isInvalid()) 1907 MemInitializers.push_back(MemInit.get()); 1908 else 1909 AnyErrors = true; 1910 } 1911 1912 if (Tok.is(tok::comma)) 1913 ConsumeToken(); 1914 else if (Tok.is(tok::l_brace)) 1915 break; 1916 // If the next token looks like a base or member initializer, assume that 1917 // we're just missing a comma. 1918 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 1919 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 1920 Diag(Loc, diag::err_ctor_init_missing_comma) 1921 << FixItHint::CreateInsertion(Loc, ", "); 1922 } else { 1923 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1924 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1925 SkipUntil(tok::l_brace, true, true); 1926 break; 1927 } 1928 } while (true); 1929 1930 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1931 MemInitializers.data(), MemInitializers.size(), 1932 AnyErrors); 1933} 1934 1935/// ParseMemInitializer - Parse a C++ member initializer, which is 1936/// part of a constructor initializer that explicitly initializes one 1937/// member or base class (C++ [class.base.init]). See 1938/// ParseConstructorInitializer for an example. 1939/// 1940/// [C++] mem-initializer: 1941/// mem-initializer-id '(' expression-list[opt] ')' 1942/// 1943/// [C++] mem-initializer-id: 1944/// '::'[opt] nested-name-specifier[opt] class-name 1945/// identifier 1946Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 1947 // parse '::'[opt] nested-name-specifier[opt] 1948 CXXScopeSpec SS; 1949 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1950 ParsedType TemplateTypeTy; 1951 if (Tok.is(tok::annot_template_id)) { 1952 TemplateIdAnnotation *TemplateId 1953 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1954 if (TemplateId->Kind == TNK_Type_template || 1955 TemplateId->Kind == TNK_Dependent_template_name) { 1956 AnnotateTemplateIdTokenAsType(&SS); 1957 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1958 TemplateTypeTy = getTypeAnnotation(Tok); 1959 } 1960 } 1961 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1962 Diag(Tok, diag::err_expected_member_or_base_name); 1963 return true; 1964 } 1965 1966 // Get the identifier. This may be a member name or a class name, 1967 // but we'll let the semantic analysis determine which it is. 1968 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1969 SourceLocation IdLoc = ConsumeToken(); 1970 1971 // Parse the '('. 1972 if (Tok.isNot(tok::l_paren)) { 1973 Diag(Tok, diag::err_expected_lparen); 1974 return true; 1975 } 1976 SourceLocation LParenLoc = ConsumeParen(); 1977 1978 // Parse the optional expression-list. 1979 ExprVector ArgExprs(Actions); 1980 CommaLocsTy CommaLocs; 1981 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1982 SkipUntil(tok::r_paren); 1983 return true; 1984 } 1985 1986 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1987 1988 SourceLocation EllipsisLoc; 1989 if (Tok.is(tok::ellipsis)) 1990 EllipsisLoc = ConsumeToken(); 1991 1992 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 1993 TemplateTypeTy, IdLoc, 1994 LParenLoc, ArgExprs.take(), 1995 ArgExprs.size(), RParenLoc, 1996 EllipsisLoc); 1997} 1998 1999/// ParseExceptionSpecification - Parse a C++ exception-specification 2000/// (C++ [except.spec]). 2001/// 2002/// exception-specification: 2003/// 'throw' '(' type-id-list [opt] ')' 2004/// [MS] 'throw' '(' '...' ')' 2005/// 2006/// type-id-list: 2007/// type-id ... [opt] 2008/// type-id-list ',' type-id ... [opt] 2009/// 2010bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 2011 llvm::SmallVectorImpl<ParsedType> 2012 &Exceptions, 2013 llvm::SmallVectorImpl<SourceRange> 2014 &Ranges, 2015 bool &hasAnyExceptionSpec) { 2016 assert(Tok.is(tok::kw_throw) && "expected throw"); 2017 2018 ConsumeToken(); 2019 2020 if (!Tok.is(tok::l_paren)) { 2021 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2022 } 2023 SourceLocation LParenLoc = ConsumeParen(); 2024 2025 // Parse throw(...), a Microsoft extension that means "this function 2026 // can throw anything". 2027 if (Tok.is(tok::ellipsis)) { 2028 hasAnyExceptionSpec = true; 2029 SourceLocation EllipsisLoc = ConsumeToken(); 2030 if (!getLang().Microsoft) 2031 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2032 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2033 return false; 2034 } 2035 2036 // Parse the sequence of type-ids. 2037 SourceRange Range; 2038 while (Tok.isNot(tok::r_paren)) { 2039 TypeResult Res(ParseTypeName(&Range)); 2040 2041 if (Tok.is(tok::ellipsis)) { 2042 // C++0x [temp.variadic]p5: 2043 // - In a dynamic-exception-specification (15.4); the pattern is a 2044 // type-id. 2045 SourceLocation Ellipsis = ConsumeToken(); 2046 if (!Res.isInvalid()) 2047 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2048 } 2049 2050 if (!Res.isInvalid()) { 2051 Exceptions.push_back(Res.get()); 2052 Ranges.push_back(Range); 2053 } 2054 2055 if (Tok.is(tok::comma)) 2056 ConsumeToken(); 2057 else 2058 break; 2059 } 2060 2061 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2062 return false; 2063} 2064 2065/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2066/// function declaration. 2067TypeResult Parser::ParseTrailingReturnType() { 2068 assert(Tok.is(tok::arrow) && "expected arrow"); 2069 2070 ConsumeToken(); 2071 2072 // FIXME: Need to suppress declarations when parsing this typename. 2073 // Otherwise in this function definition: 2074 // 2075 // auto f() -> struct X {} 2076 // 2077 // struct X is parsed as class definition because of the trailing 2078 // brace. 2079 2080 SourceRange Range; 2081 return ParseTypeName(&Range); 2082} 2083 2084/// \brief We have just started parsing the definition of a new class, 2085/// so push that class onto our stack of classes that is currently 2086/// being parsed. 2087void Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2088 assert((NonNestedClass || !ClassStack.empty()) && 2089 "Nested class without outer class"); 2090 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2091} 2092 2093/// \brief Deallocate the given parsed class and all of its nested 2094/// classes. 2095void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2096 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2097 delete Class->LateParsedDeclarations[I]; 2098 delete Class; 2099} 2100 2101/// \brief Pop the top class of the stack of classes that are 2102/// currently being parsed. 2103/// 2104/// This routine should be called when we have finished parsing the 2105/// definition of a class, but have not yet popped the Scope 2106/// associated with the class's definition. 2107/// 2108/// \returns true if the class we've popped is a top-level class, 2109/// false otherwise. 2110void Parser::PopParsingClass() { 2111 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2112 2113 ParsingClass *Victim = ClassStack.top(); 2114 ClassStack.pop(); 2115 if (Victim->TopLevelClass) { 2116 // Deallocate all of the nested classes of this class, 2117 // recursively: we don't need to keep any of this information. 2118 DeallocateParsedClasses(Victim); 2119 return; 2120 } 2121 assert(!ClassStack.empty() && "Missing top-level class?"); 2122 2123 if (Victim->LateParsedDeclarations.empty()) { 2124 // The victim is a nested class, but we will not need to perform 2125 // any processing after the definition of this class since it has 2126 // no members whose handling was delayed. Therefore, we can just 2127 // remove this nested class. 2128 DeallocateParsedClasses(Victim); 2129 return; 2130 } 2131 2132 // This nested class has some members that will need to be processed 2133 // after the top-level class is completely defined. Therefore, add 2134 // it to the list of nested classes within its parent. 2135 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2136 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2137 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2138} 2139 2140/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2141/// parses standard attributes. 2142/// 2143/// [C++0x] attribute-specifier: 2144/// '[' '[' attribute-list ']' ']' 2145/// 2146/// [C++0x] attribute-list: 2147/// attribute[opt] 2148/// attribute-list ',' attribute[opt] 2149/// 2150/// [C++0x] attribute: 2151/// attribute-token attribute-argument-clause[opt] 2152/// 2153/// [C++0x] attribute-token: 2154/// identifier 2155/// attribute-scoped-token 2156/// 2157/// [C++0x] attribute-scoped-token: 2158/// attribute-namespace '::' identifier 2159/// 2160/// [C++0x] attribute-namespace: 2161/// identifier 2162/// 2163/// [C++0x] attribute-argument-clause: 2164/// '(' balanced-token-seq ')' 2165/// 2166/// [C++0x] balanced-token-seq: 2167/// balanced-token 2168/// balanced-token-seq balanced-token 2169/// 2170/// [C++0x] balanced-token: 2171/// '(' balanced-token-seq ')' 2172/// '[' balanced-token-seq ']' 2173/// '{' balanced-token-seq '}' 2174/// any token but '(', ')', '[', ']', '{', or '}' 2175void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2176 SourceLocation *endLoc) { 2177 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2178 && "Not a C++0x attribute list"); 2179 2180 SourceLocation StartLoc = Tok.getLocation(), Loc; 2181 2182 ConsumeBracket(); 2183 ConsumeBracket(); 2184 2185 if (Tok.is(tok::comma)) { 2186 Diag(Tok.getLocation(), diag::err_expected_ident); 2187 ConsumeToken(); 2188 } 2189 2190 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2191 // attribute not present 2192 if (Tok.is(tok::comma)) { 2193 ConsumeToken(); 2194 continue; 2195 } 2196 2197 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2198 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2199 2200 // scoped attribute 2201 if (Tok.is(tok::coloncolon)) { 2202 ConsumeToken(); 2203 2204 if (!Tok.is(tok::identifier)) { 2205 Diag(Tok.getLocation(), diag::err_expected_ident); 2206 SkipUntil(tok::r_square, tok::comma, true, true); 2207 continue; 2208 } 2209 2210 ScopeName = AttrName; 2211 ScopeLoc = AttrLoc; 2212 2213 AttrName = Tok.getIdentifierInfo(); 2214 AttrLoc = ConsumeToken(); 2215 } 2216 2217 bool AttrParsed = false; 2218 // No scoped names are supported; ideally we could put all non-standard 2219 // attributes into namespaces. 2220 if (!ScopeName) { 2221 switch(AttributeList::getKind(AttrName)) 2222 { 2223 // No arguments 2224 case AttributeList::AT_base_check: 2225 case AttributeList::AT_carries_dependency: 2226 case AttributeList::AT_final: 2227 case AttributeList::AT_hiding: 2228 case AttributeList::AT_noreturn: 2229 case AttributeList::AT_override: { 2230 if (Tok.is(tok::l_paren)) { 2231 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2232 << AttrName->getName(); 2233 break; 2234 } 2235 2236 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 0, 2237 SourceLocation(), 0, 0, false, true)); 2238 AttrParsed = true; 2239 break; 2240 } 2241 2242 // One argument; must be a type-id or assignment-expression 2243 case AttributeList::AT_aligned: { 2244 if (Tok.isNot(tok::l_paren)) { 2245 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2246 << AttrName->getName(); 2247 break; 2248 } 2249 SourceLocation ParamLoc = ConsumeParen(); 2250 2251 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2252 2253 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2254 2255 ExprVector ArgExprs(Actions); 2256 ArgExprs.push_back(ArgExpr.release()); 2257 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 2258 0, ParamLoc, ArgExprs.take(), 1, 2259 false, true)); 2260 2261 AttrParsed = true; 2262 break; 2263 } 2264 2265 // Silence warnings 2266 default: break; 2267 } 2268 } 2269 2270 // Skip the entire parameter clause, if any 2271 if (!AttrParsed && Tok.is(tok::l_paren)) { 2272 ConsumeParen(); 2273 // SkipUntil maintains the balancedness of tokens. 2274 SkipUntil(tok::r_paren, false); 2275 } 2276 } 2277 2278 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2279 SkipUntil(tok::r_square, false); 2280 Loc = Tok.getLocation(); 2281 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2282 SkipUntil(tok::r_square, false); 2283 2284 attrs.Range = SourceRange(StartLoc, Loc); 2285} 2286 2287/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2288/// attribute. 2289/// 2290/// FIXME: Simply returns an alignof() expression if the argument is a 2291/// type. Ideally, the type should be propagated directly into Sema. 2292/// 2293/// [C++0x] 'align' '(' type-id ')' 2294/// [C++0x] 'align' '(' assignment-expression ')' 2295ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2296 if (isTypeIdInParens()) { 2297 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2298 SourceLocation TypeLoc = Tok.getLocation(); 2299 ParsedType Ty = ParseTypeName().get(); 2300 SourceRange TypeRange(Start, Tok.getLocation()); 2301 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, 2302 Ty.getAsOpaquePtr(), TypeRange); 2303 } else 2304 return ParseConstantExpression(); 2305} 2306 2307/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2308/// 2309/// [MS] ms-attribute: 2310/// '[' token-seq ']' 2311/// 2312/// [MS] ms-attribute-seq: 2313/// ms-attribute[opt] 2314/// ms-attribute ms-attribute-seq 2315void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2316 SourceLocation *endLoc) { 2317 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2318 2319 while (Tok.is(tok::l_square)) { 2320 ConsumeBracket(); 2321 SkipUntil(tok::r_square, true, true); 2322 if (endLoc) *endLoc = Tok.getLocation(); 2323 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2324 } 2325} 2326