ParseDeclCXX.cpp revision dfc2f1035d23e294b298766a3cf51dfe249d53a2
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().CPlusPlus0x) 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 ConsumeToken(); 1320 } 1321} 1322 1323/// isCXX0XClassVirtSpecifier - Determine whether the next token is a C++0x 1324/// class-virt-specifier. 1325/// 1326/// class-virt-specifier: 1327/// final 1328/// explicit 1329ClassVirtSpecifiers::Specifier Parser::isCXX0XClassVirtSpecifier() const { 1330 if (!getLang().CPlusPlus0x) 1331 return ClassVirtSpecifiers::CVS_None; 1332 1333 if (Tok.is(tok::kw_explicit)) 1334 return ClassVirtSpecifiers::CVS_Explicit; 1335 1336 if (Tok.is(tok::identifier)) { 1337 IdentifierInfo *II = Tok.getIdentifierInfo(); 1338 1339 // Initialize the contextual keywords. 1340 if (!Ident_final) { 1341 Ident_final = &PP.getIdentifierTable().get("final"); 1342 Ident_override = &PP.getIdentifierTable().get("override"); 1343 } 1344 1345 if (II == Ident_final) 1346 return ClassVirtSpecifiers::CVS_Final; 1347 } 1348 1349 return ClassVirtSpecifiers::CVS_None; 1350} 1351 1352/// ParseOptionalCXX0XClassVirtSpecifierSeq - Parse a class-virt-specifier-seq. 1353/// 1354/// class-virt-specifier-seq: 1355/// class-virt-specifier 1356/// class-virt-specifier-seq class-virt-specifier 1357void Parser::ParseOptionalCXX0XClassVirtSpecifierSeq(ClassVirtSpecifiers &CVS) { 1358 while (true) { 1359 ClassVirtSpecifiers::Specifier Specifier = isCXX0XClassVirtSpecifier(); 1360 if (Specifier == ClassVirtSpecifiers::CVS_None) 1361 return; 1362 1363 // C++ [class]p1: 1364 // A class-virt-specifier-seq shall contain at most one of each 1365 // class-virt-specifier. 1366 const char *PrevSpec = 0; 1367 if (CVS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1368 Diag(Tok.getLocation(), diag::err_duplicate_class_virt_specifier) 1369 << PrevSpec 1370 << FixItHint::CreateRemoval(Tok.getLocation()); 1371 ConsumeToken(); 1372 } 1373} 1374 1375/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1376/// 1377/// member-declaration: 1378/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1379/// function-definition ';'[opt] 1380/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1381/// using-declaration [TODO] 1382/// [C++0x] static_assert-declaration 1383/// template-declaration 1384/// [GNU] '__extension__' member-declaration 1385/// 1386/// member-declarator-list: 1387/// member-declarator 1388/// member-declarator-list ',' member-declarator 1389/// 1390/// member-declarator: 1391/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1392/// declarator constant-initializer[opt] 1393/// identifier[opt] ':' constant-expression 1394/// 1395/// virt-specifier-seq: 1396/// virt-specifier 1397/// virt-specifier-seq virt-specifier 1398/// 1399/// virt-specifier: 1400/// override 1401/// final 1402/// new 1403/// 1404/// pure-specifier: 1405/// '= 0' 1406/// 1407/// constant-initializer: 1408/// '=' constant-expression 1409/// 1410void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1411 const ParsedTemplateInfo &TemplateInfo, 1412 ParsingDeclRAIIObject *TemplateDiags) { 1413 // Access declarations. 1414 if (!TemplateInfo.Kind && 1415 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1416 !TryAnnotateCXXScopeToken() && 1417 Tok.is(tok::annot_cxxscope)) { 1418 bool isAccessDecl = false; 1419 if (NextToken().is(tok::identifier)) 1420 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1421 else 1422 isAccessDecl = NextToken().is(tok::kw_operator); 1423 1424 if (isAccessDecl) { 1425 // Collect the scope specifier token we annotated earlier. 1426 CXXScopeSpec SS; 1427 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1428 1429 // Try to parse an unqualified-id. 1430 UnqualifiedId Name; 1431 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1432 SkipUntil(tok::semi); 1433 return; 1434 } 1435 1436 // TODO: recover from mistakenly-qualified operator declarations. 1437 if (ExpectAndConsume(tok::semi, 1438 diag::err_expected_semi_after, 1439 "access declaration", 1440 tok::semi)) 1441 return; 1442 1443 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1444 false, SourceLocation(), 1445 SS, Name, 1446 /* AttrList */ 0, 1447 /* IsTypeName */ false, 1448 SourceLocation()); 1449 return; 1450 } 1451 } 1452 1453 // static_assert-declaration 1454 if (Tok.is(tok::kw_static_assert)) { 1455 // FIXME: Check for templates 1456 SourceLocation DeclEnd; 1457 ParseStaticAssertDeclaration(DeclEnd); 1458 return; 1459 } 1460 1461 if (Tok.is(tok::kw_template)) { 1462 assert(!TemplateInfo.TemplateParams && 1463 "Nested template improperly parsed?"); 1464 SourceLocation DeclEnd; 1465 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1466 AS); 1467 return; 1468 } 1469 1470 // Handle: member-declaration ::= '__extension__' member-declaration 1471 if (Tok.is(tok::kw___extension__)) { 1472 // __extension__ silences extension warnings in the subexpression. 1473 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1474 ConsumeToken(); 1475 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1476 } 1477 1478 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1479 // is a bitfield. 1480 ColonProtectionRAIIObject X(*this); 1481 1482 ParsedAttributesWithRange attrs; 1483 // Optional C++0x attribute-specifier 1484 MaybeParseCXX0XAttributes(attrs); 1485 MaybeParseMicrosoftAttributes(attrs); 1486 1487 if (Tok.is(tok::kw_using)) { 1488 // FIXME: Check for template aliases 1489 1490 ProhibitAttributes(attrs); 1491 1492 // Eat 'using'. 1493 SourceLocation UsingLoc = ConsumeToken(); 1494 1495 if (Tok.is(tok::kw_namespace)) { 1496 Diag(UsingLoc, diag::err_using_namespace_in_class); 1497 SkipUntil(tok::semi, true, true); 1498 } else { 1499 SourceLocation DeclEnd; 1500 // Otherwise, it must be using-declaration. 1501 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1502 UsingLoc, DeclEnd, AS); 1503 } 1504 return; 1505 } 1506 1507 // decl-specifier-seq: 1508 // Parse the common declaration-specifiers piece. 1509 ParsingDeclSpec DS(*this, TemplateDiags); 1510 DS.takeAttributesFrom(attrs); 1511 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1512 1513 MultiTemplateParamsArg TemplateParams(Actions, 1514 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1515 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1516 1517 if (Tok.is(tok::semi)) { 1518 ConsumeToken(); 1519 Decl *TheDecl = 1520 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 1521 DS.complete(TheDecl); 1522 return; 1523 } 1524 1525 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1526 1527 if (Tok.isNot(tok::colon)) { 1528 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1529 ColonProtectionRAIIObject X(*this); 1530 1531 // Parse the first declarator. 1532 ParseDeclarator(DeclaratorInfo); 1533 // Error parsing the declarator? 1534 if (!DeclaratorInfo.hasName()) { 1535 // If so, skip until the semi-colon or a }. 1536 SkipUntil(tok::r_brace, true); 1537 if (Tok.is(tok::semi)) 1538 ConsumeToken(); 1539 return; 1540 } 1541 1542 // If attributes exist after the declarator, but before an '{', parse them. 1543 MaybeParseGNUAttributes(DeclaratorInfo); 1544 1545 // function-definition: 1546 if (Tok.is(tok::l_brace) 1547 || (DeclaratorInfo.isFunctionDeclarator() && 1548 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1549 if (!DeclaratorInfo.isFunctionDeclarator()) { 1550 Diag(Tok, diag::err_func_def_no_params); 1551 ConsumeBrace(); 1552 SkipUntil(tok::r_brace, true); 1553 1554 // Consume the optional ';' 1555 if (Tok.is(tok::semi)) 1556 ConsumeToken(); 1557 return; 1558 } 1559 1560 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1561 Diag(Tok, diag::err_function_declared_typedef); 1562 // This recovery skips the entire function body. It would be nice 1563 // to simply call ParseCXXInlineMethodDef() below, however Sema 1564 // assumes the declarator represents a function, not a typedef. 1565 ConsumeBrace(); 1566 SkipUntil(tok::r_brace, true); 1567 1568 // Consume the optional ';' 1569 if (Tok.is(tok::semi)) 1570 ConsumeToken(); 1571 return; 1572 } 1573 1574 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1575 // Consume the optional ';' 1576 if (Tok.is(tok::semi)) 1577 ConsumeToken(); 1578 1579 return; 1580 } 1581 } 1582 1583 // member-declarator-list: 1584 // member-declarator 1585 // member-declarator-list ',' member-declarator 1586 1587 llvm::SmallVector<Decl *, 8> DeclsInGroup; 1588 ExprResult BitfieldSize; 1589 ExprResult Init; 1590 bool Deleted = false; 1591 1592 while (1) { 1593 // member-declarator: 1594 // declarator pure-specifier[opt] 1595 // declarator constant-initializer[opt] 1596 // identifier[opt] ':' constant-expression 1597 if (Tok.is(tok::colon)) { 1598 ConsumeToken(); 1599 BitfieldSize = ParseConstantExpression(); 1600 if (BitfieldSize.isInvalid()) 1601 SkipUntil(tok::comma, true, true); 1602 } 1603 1604 VirtSpecifiers VS; 1605 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1606 1607 // pure-specifier: 1608 // '= 0' 1609 // 1610 // constant-initializer: 1611 // '=' constant-expression 1612 // 1613 // defaulted/deleted function-definition: 1614 // '=' 'default' [TODO] 1615 // '=' 'delete' 1616 if (Tok.is(tok::equal)) { 1617 ConsumeToken(); 1618 if (Tok.is(tok::kw_delete)) { 1619 if (!getLang().CPlusPlus0x) 1620 Diag(Tok, diag::warn_deleted_function_accepted_as_extension); 1621 ConsumeToken(); 1622 Deleted = true; 1623 } else { 1624 Init = ParseInitializer(); 1625 if (Init.isInvalid()) 1626 SkipUntil(tok::comma, true, true); 1627 } 1628 } 1629 1630 // If a simple-asm-expr is present, parse it. 1631 if (Tok.is(tok::kw_asm)) { 1632 SourceLocation Loc; 1633 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1634 if (AsmLabel.isInvalid()) 1635 SkipUntil(tok::comma, true, true); 1636 1637 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1638 DeclaratorInfo.SetRangeEnd(Loc); 1639 } 1640 1641 // If attributes exist after the declarator, parse them. 1642 MaybeParseGNUAttributes(DeclaratorInfo); 1643 1644 // NOTE: If Sema is the Action module and declarator is an instance field, 1645 // this call will *not* return the created decl; It will return null. 1646 // See Sema::ActOnCXXMemberDeclarator for details. 1647 1648 Decl *ThisDecl = 0; 1649 if (DS.isFriendSpecified()) { 1650 // TODO: handle initializers, bitfields, 'delete' 1651 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1652 /*IsDefinition*/ false, 1653 move(TemplateParams)); 1654 } else { 1655 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1656 DeclaratorInfo, 1657 move(TemplateParams), 1658 BitfieldSize.release(), 1659 VS, Init.release(), 1660 /*IsDefinition*/Deleted, 1661 Deleted); 1662 } 1663 if (ThisDecl) 1664 DeclsInGroup.push_back(ThisDecl); 1665 1666 if (DeclaratorInfo.isFunctionDeclarator() && 1667 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1668 != DeclSpec::SCS_typedef) { 1669 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1670 } 1671 1672 DeclaratorInfo.complete(ThisDecl); 1673 1674 // If we don't have a comma, it is either the end of the list (a ';') 1675 // or an error, bail out. 1676 if (Tok.isNot(tok::comma)) 1677 break; 1678 1679 // Consume the comma. 1680 ConsumeToken(); 1681 1682 // Parse the next declarator. 1683 DeclaratorInfo.clear(); 1684 BitfieldSize = 0; 1685 Init = 0; 1686 Deleted = false; 1687 1688 // Attributes are only allowed on the second declarator. 1689 MaybeParseGNUAttributes(DeclaratorInfo); 1690 1691 if (Tok.isNot(tok::colon)) 1692 ParseDeclarator(DeclaratorInfo); 1693 } 1694 1695 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1696 // Skip to end of block or statement. 1697 SkipUntil(tok::r_brace, true, true); 1698 // If we stopped at a ';', eat it. 1699 if (Tok.is(tok::semi)) ConsumeToken(); 1700 return; 1701 } 1702 1703 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1704 DeclsInGroup.size()); 1705} 1706 1707/// ParseCXXMemberSpecification - Parse the class definition. 1708/// 1709/// member-specification: 1710/// member-declaration member-specification[opt] 1711/// access-specifier ':' member-specification[opt] 1712/// 1713void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1714 unsigned TagType, Decl *TagDecl) { 1715 assert((TagType == DeclSpec::TST_struct || 1716 TagType == DeclSpec::TST_union || 1717 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1718 1719 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 1720 "parsing struct/union/class body"); 1721 1722 // Determine whether this is a non-nested class. Note that local 1723 // classes are *not* considered to be nested classes. 1724 bool NonNestedClass = true; 1725 if (!ClassStack.empty()) { 1726 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 1727 if (S->isClassScope()) { 1728 // We're inside a class scope, so this is a nested class. 1729 NonNestedClass = false; 1730 break; 1731 } 1732 1733 if ((S->getFlags() & Scope::FnScope)) { 1734 // If we're in a function or function template declared in the 1735 // body of a class, then this is a local class rather than a 1736 // nested class. 1737 const Scope *Parent = S->getParent(); 1738 if (Parent->isTemplateParamScope()) 1739 Parent = Parent->getParent(); 1740 if (Parent->isClassScope()) 1741 break; 1742 } 1743 } 1744 } 1745 1746 // Enter a scope for the class. 1747 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1748 1749 // Note that we are parsing a new (potentially-nested) class definition. 1750 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1751 1752 if (TagDecl) 1753 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 1754 1755 ClassVirtSpecifiers CVS; 1756 ParseOptionalCXX0XClassVirtSpecifierSeq(CVS); 1757 1758 if (Tok.is(tok::colon)) { 1759 ParseBaseClause(TagDecl); 1760 1761 if (!Tok.is(tok::l_brace)) { 1762 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1763 1764 if (TagDecl) 1765 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 1766 return; 1767 } 1768 } 1769 1770 assert(Tok.is(tok::l_brace)); 1771 1772 SourceLocation LBraceLoc = ConsumeBrace(); 1773 1774 if (TagDecl) 1775 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, CVS, 1776 LBraceLoc); 1777 1778 // C++ 11p3: Members of a class defined with the keyword class are private 1779 // by default. Members of a class defined with the keywords struct or union 1780 // are public by default. 1781 AccessSpecifier CurAS; 1782 if (TagType == DeclSpec::TST_class) 1783 CurAS = AS_private; 1784 else 1785 CurAS = AS_public; 1786 1787 SourceLocation RBraceLoc; 1788 if (TagDecl) { 1789 // While we still have something to read, read the member-declarations. 1790 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1791 // Each iteration of this loop reads one member-declaration. 1792 1793 // Check for extraneous top-level semicolon. 1794 if (Tok.is(tok::semi)) { 1795 Diag(Tok, diag::ext_extra_struct_semi) 1796 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 1797 << FixItHint::CreateRemoval(Tok.getLocation()); 1798 ConsumeToken(); 1799 continue; 1800 } 1801 1802 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1803 if (AS != AS_none) { 1804 // Current token is a C++ access specifier. 1805 CurAS = AS; 1806 SourceLocation ASLoc = Tok.getLocation(); 1807 ConsumeToken(); 1808 if (Tok.is(tok::colon)) 1809 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 1810 else 1811 Diag(Tok, diag::err_expected_colon); 1812 ConsumeToken(); 1813 continue; 1814 } 1815 1816 // FIXME: Make sure we don't have a template here. 1817 1818 // Parse all the comma separated declarators. 1819 ParseCXXClassMemberDeclaration(CurAS); 1820 } 1821 1822 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1823 } else { 1824 SkipUntil(tok::r_brace, false, false); 1825 } 1826 1827 // If attributes exist after class contents, parse them. 1828 ParsedAttributes attrs; 1829 MaybeParseGNUAttributes(attrs); 1830 1831 if (TagDecl) 1832 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 1833 LBraceLoc, RBraceLoc, 1834 attrs.getList()); 1835 1836 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1837 // complete within function bodies, default arguments, 1838 // exception-specifications, and constructor ctor-initializers (including 1839 // such things in nested classes). 1840 // 1841 // FIXME: Only function bodies and constructor ctor-initializers are 1842 // parsed correctly, fix the rest. 1843 if (TagDecl && NonNestedClass) { 1844 // We are not inside a nested class. This class and its nested classes 1845 // are complete and we can parse the delayed portions of method 1846 // declarations and the lexed inline method definitions. 1847 SourceLocation SavedPrevTokLocation = PrevTokLocation; 1848 ParseLexedMethodDeclarations(getCurrentClass()); 1849 ParseLexedMethodDefs(getCurrentClass()); 1850 PrevTokLocation = SavedPrevTokLocation; 1851 } 1852 1853 if (TagDecl) 1854 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 1855 1856 // Leave the class scope. 1857 ParsingDef.Pop(); 1858 ClassScope.Exit(); 1859} 1860 1861/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1862/// which explicitly initializes the members or base classes of a 1863/// class (C++ [class.base.init]). For example, the three initializers 1864/// after the ':' in the Derived constructor below: 1865/// 1866/// @code 1867/// class Base { }; 1868/// class Derived : Base { 1869/// int x; 1870/// float f; 1871/// public: 1872/// Derived(float f) : Base(), x(17), f(f) { } 1873/// }; 1874/// @endcode 1875/// 1876/// [C++] ctor-initializer: 1877/// ':' mem-initializer-list 1878/// 1879/// [C++] mem-initializer-list: 1880/// mem-initializer ...[opt] 1881/// mem-initializer ...[opt] , mem-initializer-list 1882void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 1883 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1884 1885 SourceLocation ColonLoc = ConsumeToken(); 1886 1887 llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers; 1888 bool AnyErrors = false; 1889 1890 do { 1891 if (Tok.is(tok::code_completion)) { 1892 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 1893 MemInitializers.data(), 1894 MemInitializers.size()); 1895 ConsumeCodeCompletionToken(); 1896 } else { 1897 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1898 if (!MemInit.isInvalid()) 1899 MemInitializers.push_back(MemInit.get()); 1900 else 1901 AnyErrors = true; 1902 } 1903 1904 if (Tok.is(tok::comma)) 1905 ConsumeToken(); 1906 else if (Tok.is(tok::l_brace)) 1907 break; 1908 // If the next token looks like a base or member initializer, assume that 1909 // we're just missing a comma. 1910 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 1911 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 1912 Diag(Loc, diag::err_ctor_init_missing_comma) 1913 << FixItHint::CreateInsertion(Loc, ", "); 1914 } else { 1915 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1916 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1917 SkipUntil(tok::l_brace, true, true); 1918 break; 1919 } 1920 } while (true); 1921 1922 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1923 MemInitializers.data(), MemInitializers.size(), 1924 AnyErrors); 1925} 1926 1927/// ParseMemInitializer - Parse a C++ member initializer, which is 1928/// part of a constructor initializer that explicitly initializes one 1929/// member or base class (C++ [class.base.init]). See 1930/// ParseConstructorInitializer for an example. 1931/// 1932/// [C++] mem-initializer: 1933/// mem-initializer-id '(' expression-list[opt] ')' 1934/// 1935/// [C++] mem-initializer-id: 1936/// '::'[opt] nested-name-specifier[opt] class-name 1937/// identifier 1938Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 1939 // parse '::'[opt] nested-name-specifier[opt] 1940 CXXScopeSpec SS; 1941 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1942 ParsedType TemplateTypeTy; 1943 if (Tok.is(tok::annot_template_id)) { 1944 TemplateIdAnnotation *TemplateId 1945 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1946 if (TemplateId->Kind == TNK_Type_template || 1947 TemplateId->Kind == TNK_Dependent_template_name) { 1948 AnnotateTemplateIdTokenAsType(&SS); 1949 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1950 TemplateTypeTy = getTypeAnnotation(Tok); 1951 } 1952 } 1953 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1954 Diag(Tok, diag::err_expected_member_or_base_name); 1955 return true; 1956 } 1957 1958 // Get the identifier. This may be a member name or a class name, 1959 // but we'll let the semantic analysis determine which it is. 1960 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1961 SourceLocation IdLoc = ConsumeToken(); 1962 1963 // Parse the '('. 1964 if (Tok.isNot(tok::l_paren)) { 1965 Diag(Tok, diag::err_expected_lparen); 1966 return true; 1967 } 1968 SourceLocation LParenLoc = ConsumeParen(); 1969 1970 // Parse the optional expression-list. 1971 ExprVector ArgExprs(Actions); 1972 CommaLocsTy CommaLocs; 1973 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1974 SkipUntil(tok::r_paren); 1975 return true; 1976 } 1977 1978 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1979 1980 SourceLocation EllipsisLoc; 1981 if (Tok.is(tok::ellipsis)) 1982 EllipsisLoc = ConsumeToken(); 1983 1984 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 1985 TemplateTypeTy, IdLoc, 1986 LParenLoc, ArgExprs.take(), 1987 ArgExprs.size(), RParenLoc, 1988 EllipsisLoc); 1989} 1990 1991/// ParseExceptionSpecification - Parse a C++ exception-specification 1992/// (C++ [except.spec]). 1993/// 1994/// exception-specification: 1995/// 'throw' '(' type-id-list [opt] ')' 1996/// [MS] 'throw' '(' '...' ')' 1997/// 1998/// type-id-list: 1999/// type-id ... [opt] 2000/// type-id-list ',' type-id ... [opt] 2001/// 2002bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 2003 llvm::SmallVectorImpl<ParsedType> 2004 &Exceptions, 2005 llvm::SmallVectorImpl<SourceRange> 2006 &Ranges, 2007 bool &hasAnyExceptionSpec) { 2008 assert(Tok.is(tok::kw_throw) && "expected throw"); 2009 2010 ConsumeToken(); 2011 2012 if (!Tok.is(tok::l_paren)) { 2013 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2014 } 2015 SourceLocation LParenLoc = ConsumeParen(); 2016 2017 // Parse throw(...), a Microsoft extension that means "this function 2018 // can throw anything". 2019 if (Tok.is(tok::ellipsis)) { 2020 hasAnyExceptionSpec = true; 2021 SourceLocation EllipsisLoc = ConsumeToken(); 2022 if (!getLang().Microsoft) 2023 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2024 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2025 return false; 2026 } 2027 2028 // Parse the sequence of type-ids. 2029 SourceRange Range; 2030 while (Tok.isNot(tok::r_paren)) { 2031 TypeResult Res(ParseTypeName(&Range)); 2032 2033 if (Tok.is(tok::ellipsis)) { 2034 // C++0x [temp.variadic]p5: 2035 // - In a dynamic-exception-specification (15.4); the pattern is a 2036 // type-id. 2037 SourceLocation Ellipsis = ConsumeToken(); 2038 if (!Res.isInvalid()) 2039 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2040 } 2041 2042 if (!Res.isInvalid()) { 2043 Exceptions.push_back(Res.get()); 2044 Ranges.push_back(Range); 2045 } 2046 2047 if (Tok.is(tok::comma)) 2048 ConsumeToken(); 2049 else 2050 break; 2051 } 2052 2053 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2054 return false; 2055} 2056 2057/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2058/// function declaration. 2059TypeResult Parser::ParseTrailingReturnType() { 2060 assert(Tok.is(tok::arrow) && "expected arrow"); 2061 2062 ConsumeToken(); 2063 2064 // FIXME: Need to suppress declarations when parsing this typename. 2065 // Otherwise in this function definition: 2066 // 2067 // auto f() -> struct X {} 2068 // 2069 // struct X is parsed as class definition because of the trailing 2070 // brace. 2071 2072 SourceRange Range; 2073 return ParseTypeName(&Range); 2074} 2075 2076/// \brief We have just started parsing the definition of a new class, 2077/// so push that class onto our stack of classes that is currently 2078/// being parsed. 2079void Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2080 assert((NonNestedClass || !ClassStack.empty()) && 2081 "Nested class without outer class"); 2082 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2083} 2084 2085/// \brief Deallocate the given parsed class and all of its nested 2086/// classes. 2087void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2088 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2089 delete Class->LateParsedDeclarations[I]; 2090 delete Class; 2091} 2092 2093/// \brief Pop the top class of the stack of classes that are 2094/// currently being parsed. 2095/// 2096/// This routine should be called when we have finished parsing the 2097/// definition of a class, but have not yet popped the Scope 2098/// associated with the class's definition. 2099/// 2100/// \returns true if the class we've popped is a top-level class, 2101/// false otherwise. 2102void Parser::PopParsingClass() { 2103 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2104 2105 ParsingClass *Victim = ClassStack.top(); 2106 ClassStack.pop(); 2107 if (Victim->TopLevelClass) { 2108 // Deallocate all of the nested classes of this class, 2109 // recursively: we don't need to keep any of this information. 2110 DeallocateParsedClasses(Victim); 2111 return; 2112 } 2113 assert(!ClassStack.empty() && "Missing top-level class?"); 2114 2115 if (Victim->LateParsedDeclarations.empty()) { 2116 // The victim is a nested class, but we will not need to perform 2117 // any processing after the definition of this class since it has 2118 // no members whose handling was delayed. Therefore, we can just 2119 // remove this nested class. 2120 DeallocateParsedClasses(Victim); 2121 return; 2122 } 2123 2124 // This nested class has some members that will need to be processed 2125 // after the top-level class is completely defined. Therefore, add 2126 // it to the list of nested classes within its parent. 2127 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2128 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2129 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2130} 2131 2132/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2133/// parses standard attributes. 2134/// 2135/// [C++0x] attribute-specifier: 2136/// '[' '[' attribute-list ']' ']' 2137/// 2138/// [C++0x] attribute-list: 2139/// attribute[opt] 2140/// attribute-list ',' attribute[opt] 2141/// 2142/// [C++0x] attribute: 2143/// attribute-token attribute-argument-clause[opt] 2144/// 2145/// [C++0x] attribute-token: 2146/// identifier 2147/// attribute-scoped-token 2148/// 2149/// [C++0x] attribute-scoped-token: 2150/// attribute-namespace '::' identifier 2151/// 2152/// [C++0x] attribute-namespace: 2153/// identifier 2154/// 2155/// [C++0x] attribute-argument-clause: 2156/// '(' balanced-token-seq ')' 2157/// 2158/// [C++0x] balanced-token-seq: 2159/// balanced-token 2160/// balanced-token-seq balanced-token 2161/// 2162/// [C++0x] balanced-token: 2163/// '(' balanced-token-seq ')' 2164/// '[' balanced-token-seq ']' 2165/// '{' balanced-token-seq '}' 2166/// any token but '(', ')', '[', ']', '{', or '}' 2167void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2168 SourceLocation *endLoc) { 2169 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2170 && "Not a C++0x attribute list"); 2171 2172 SourceLocation StartLoc = Tok.getLocation(), Loc; 2173 2174 ConsumeBracket(); 2175 ConsumeBracket(); 2176 2177 if (Tok.is(tok::comma)) { 2178 Diag(Tok.getLocation(), diag::err_expected_ident); 2179 ConsumeToken(); 2180 } 2181 2182 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2183 // attribute not present 2184 if (Tok.is(tok::comma)) { 2185 ConsumeToken(); 2186 continue; 2187 } 2188 2189 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2190 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2191 2192 // scoped attribute 2193 if (Tok.is(tok::coloncolon)) { 2194 ConsumeToken(); 2195 2196 if (!Tok.is(tok::identifier)) { 2197 Diag(Tok.getLocation(), diag::err_expected_ident); 2198 SkipUntil(tok::r_square, tok::comma, true, true); 2199 continue; 2200 } 2201 2202 ScopeName = AttrName; 2203 ScopeLoc = AttrLoc; 2204 2205 AttrName = Tok.getIdentifierInfo(); 2206 AttrLoc = ConsumeToken(); 2207 } 2208 2209 bool AttrParsed = false; 2210 // No scoped names are supported; ideally we could put all non-standard 2211 // attributes into namespaces. 2212 if (!ScopeName) { 2213 switch(AttributeList::getKind(AttrName)) 2214 { 2215 // No arguments 2216 case AttributeList::AT_base_check: 2217 case AttributeList::AT_carries_dependency: 2218 case AttributeList::AT_final: 2219 case AttributeList::AT_hiding: 2220 case AttributeList::AT_noreturn: 2221 case AttributeList::AT_override: { 2222 if (Tok.is(tok::l_paren)) { 2223 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2224 << AttrName->getName(); 2225 break; 2226 } 2227 2228 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 0, 2229 SourceLocation(), 0, 0, false, true)); 2230 AttrParsed = true; 2231 break; 2232 } 2233 2234 // One argument; must be a type-id or assignment-expression 2235 case AttributeList::AT_aligned: { 2236 if (Tok.isNot(tok::l_paren)) { 2237 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2238 << AttrName->getName(); 2239 break; 2240 } 2241 SourceLocation ParamLoc = ConsumeParen(); 2242 2243 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2244 2245 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2246 2247 ExprVector ArgExprs(Actions); 2248 ArgExprs.push_back(ArgExpr.release()); 2249 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 2250 0, ParamLoc, ArgExprs.take(), 1, 2251 false, true)); 2252 2253 AttrParsed = true; 2254 break; 2255 } 2256 2257 // Silence warnings 2258 default: break; 2259 } 2260 } 2261 2262 // Skip the entire parameter clause, if any 2263 if (!AttrParsed && Tok.is(tok::l_paren)) { 2264 ConsumeParen(); 2265 // SkipUntil maintains the balancedness of tokens. 2266 SkipUntil(tok::r_paren, false); 2267 } 2268 } 2269 2270 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2271 SkipUntil(tok::r_square, false); 2272 Loc = Tok.getLocation(); 2273 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2274 SkipUntil(tok::r_square, false); 2275 2276 attrs.Range = SourceRange(StartLoc, Loc); 2277} 2278 2279/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2280/// attribute. 2281/// 2282/// FIXME: Simply returns an alignof() expression if the argument is a 2283/// type. Ideally, the type should be propagated directly into Sema. 2284/// 2285/// [C++0x] 'align' '(' type-id ')' 2286/// [C++0x] 'align' '(' assignment-expression ')' 2287ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2288 if (isTypeIdInParens()) { 2289 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2290 SourceLocation TypeLoc = Tok.getLocation(); 2291 ParsedType Ty = ParseTypeName().get(); 2292 SourceRange TypeRange(Start, Tok.getLocation()); 2293 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, 2294 Ty.getAsOpaquePtr(), TypeRange); 2295 } else 2296 return ParseConstantExpression(); 2297} 2298 2299/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2300/// 2301/// [MS] ms-attribute: 2302/// '[' token-seq ']' 2303/// 2304/// [MS] ms-attribute-seq: 2305/// ms-attribute[opt] 2306/// ms-attribute ms-attribute-seq 2307void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2308 SourceLocation *endLoc) { 2309 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2310 2311 while (Tok.is(tok::l_square)) { 2312 ConsumeBracket(); 2313 SkipUntil(tok::r_square, true, true); 2314 if (endLoc) *endLoc = Tok.getLocation(); 2315 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2316 } 2317} 2318