ParseDeclCXX.cpp revision 69a87357310260c4b2c5dce2cdcd10c3fd3a0a58
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 {...' or 811 // 'struct foo :...' then this is a definition. Otherwise we have 812 // 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) || (getLang().CPlusPlus && Tok.is(tok::colon))){ 823 if (DS.isFriendSpecified()) { 824 // C++ [class.friend]p2: 825 // A class shall not be defined in a friend declaration. 826 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 827 << SourceRange(DS.getFriendSpecLoc()); 828 829 // Skip everything up to the semicolon, so that this looks like a proper 830 // friend class (or template thereof) declaration. 831 SkipUntil(tok::semi, true, true); 832 TUK = Sema::TUK_Friend; 833 } else { 834 // Okay, this is a class definition. 835 TUK = Sema::TUK_Definition; 836 } 837 } else if (Tok.is(tok::semi)) 838 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 839 else 840 TUK = Sema::TUK_Reference; 841 842 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 843 TUK != Sema::TUK_Definition)) { 844 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 845 // We have a declaration or reference to an anonymous class. 846 Diag(StartLoc, diag::err_anon_type_definition) 847 << DeclSpec::getSpecifierName(TagType); 848 } 849 850 SkipUntil(tok::comma, true); 851 852 if (TemplateId) 853 TemplateId->Destroy(); 854 return; 855 } 856 857 // Create the tag portion of the class or class template. 858 DeclResult TagOrTempResult = true; // invalid 859 TypeResult TypeResult = true; // invalid 860 861 bool Owned = false; 862 if (TemplateId) { 863 // Explicit specialization, class template partial specialization, 864 // or explicit instantiation. 865 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 866 TemplateId->getTemplateArgs(), 867 TemplateId->NumArgs); 868 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 869 TUK == Sema::TUK_Declaration) { 870 // This is an explicit instantiation of a class template. 871 TagOrTempResult 872 = Actions.ActOnExplicitInstantiation(getCurScope(), 873 TemplateInfo.ExternLoc, 874 TemplateInfo.TemplateLoc, 875 TagType, 876 StartLoc, 877 SS, 878 TemplateId->Template, 879 TemplateId->TemplateNameLoc, 880 TemplateId->LAngleLoc, 881 TemplateArgsPtr, 882 TemplateId->RAngleLoc, 883 attrs.getList()); 884 885 // Friend template-ids are treated as references unless 886 // they have template headers, in which case they're ill-formed 887 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 888 // We diagnose this error in ActOnClassTemplateSpecialization. 889 } else if (TUK == Sema::TUK_Reference || 890 (TUK == Sema::TUK_Friend && 891 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 892 TypeResult 893 = Actions.ActOnTemplateIdType(TemplateId->Template, 894 TemplateId->TemplateNameLoc, 895 TemplateId->LAngleLoc, 896 TemplateArgsPtr, 897 TemplateId->RAngleLoc); 898 899 TypeResult = Actions.ActOnTagTemplateIdType(SS, TypeResult, TUK, 900 TagType, StartLoc); 901 } else { 902 // This is an explicit specialization or a class template 903 // partial specialization. 904 TemplateParameterLists FakedParamLists; 905 906 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 907 // This looks like an explicit instantiation, because we have 908 // something like 909 // 910 // template class Foo<X> 911 // 912 // but it actually has a definition. Most likely, this was 913 // meant to be an explicit specialization, but the user forgot 914 // the '<>' after 'template'. 915 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 916 917 SourceLocation LAngleLoc 918 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 919 Diag(TemplateId->TemplateNameLoc, 920 diag::err_explicit_instantiation_with_definition) 921 << SourceRange(TemplateInfo.TemplateLoc) 922 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 923 924 // Create a fake template parameter list that contains only 925 // "template<>", so that we treat this construct as a class 926 // template specialization. 927 FakedParamLists.push_back( 928 Actions.ActOnTemplateParameterList(0, SourceLocation(), 929 TemplateInfo.TemplateLoc, 930 LAngleLoc, 931 0, 0, 932 LAngleLoc)); 933 TemplateParams = &FakedParamLists; 934 } 935 936 // Build the class template specialization. 937 TagOrTempResult 938 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 939 StartLoc, SS, 940 TemplateId->Template, 941 TemplateId->TemplateNameLoc, 942 TemplateId->LAngleLoc, 943 TemplateArgsPtr, 944 TemplateId->RAngleLoc, 945 attrs.getList(), 946 MultiTemplateParamsArg(Actions, 947 TemplateParams? &(*TemplateParams)[0] : 0, 948 TemplateParams? TemplateParams->size() : 0)); 949 } 950 TemplateId->Destroy(); 951 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 952 TUK == Sema::TUK_Declaration) { 953 // Explicit instantiation of a member of a class template 954 // specialization, e.g., 955 // 956 // template struct Outer<int>::Inner; 957 // 958 TagOrTempResult 959 = Actions.ActOnExplicitInstantiation(getCurScope(), 960 TemplateInfo.ExternLoc, 961 TemplateInfo.TemplateLoc, 962 TagType, StartLoc, SS, Name, 963 NameLoc, attrs.getList()); 964 } else if (TUK == Sema::TUK_Friend && 965 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 966 TagOrTempResult = 967 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 968 TagType, StartLoc, SS, 969 Name, NameLoc, attrs.getList(), 970 MultiTemplateParamsArg(Actions, 971 TemplateParams? &(*TemplateParams)[0] : 0, 972 TemplateParams? TemplateParams->size() : 0)); 973 } else { 974 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 975 TUK == Sema::TUK_Definition) { 976 // FIXME: Diagnose this particular error. 977 } 978 979 bool IsDependent = false; 980 981 // Don't pass down template parameter lists if this is just a tag 982 // reference. For example, we don't need the template parameters here: 983 // template <class T> class A *makeA(T t); 984 MultiTemplateParamsArg TParams; 985 if (TUK != Sema::TUK_Reference && TemplateParams) 986 TParams = 987 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 988 989 // Declaration or definition of a class type 990 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 991 SS, Name, NameLoc, attrs.getList(), AS, 992 TParams, Owned, IsDependent, false, 993 false, clang::TypeResult()); 994 995 // If ActOnTag said the type was dependent, try again with the 996 // less common call. 997 if (IsDependent) { 998 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 999 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1000 SS, Name, StartLoc, NameLoc); 1001 } 1002 } 1003 1004 // If there is a body, parse it and inform the actions module. 1005 if (TUK == Sema::TUK_Definition) { 1006 assert(Tok.is(tok::l_brace) || 1007 (getLang().CPlusPlus && Tok.is(tok::colon))); 1008 if (getLang().CPlusPlus) 1009 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1010 else 1011 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1012 } 1013 1014 // FIXME: The DeclSpec should keep the locations of both the keyword and the 1015 // name (if there is one). 1016 SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc; 1017 1018 const char *PrevSpec = 0; 1019 unsigned DiagID; 1020 bool Result; 1021 if (!TypeResult.isInvalid()) { 1022 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, TSTLoc, 1023 PrevSpec, DiagID, TypeResult.get()); 1024 } else if (!TagOrTempResult.isInvalid()) { 1025 Result = DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID, 1026 TagOrTempResult.get(), Owned); 1027 } else { 1028 DS.SetTypeSpecError(); 1029 return; 1030 } 1031 1032 if (Result) 1033 Diag(StartLoc, DiagID) << PrevSpec; 1034 1035 // At this point, we've successfully parsed a class-specifier in 'definition' 1036 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1037 // going to look at what comes after it to improve error recovery. If an 1038 // impossible token occurs next, we assume that the programmer forgot a ; at 1039 // the end of the declaration and recover that way. 1040 // 1041 // This switch enumerates the valid "follow" set for definition. 1042 if (TUK == Sema::TUK_Definition) { 1043 bool ExpectedSemi = true; 1044 switch (Tok.getKind()) { 1045 default: break; 1046 case tok::semi: // struct foo {...} ; 1047 case tok::star: // struct foo {...} * P; 1048 case tok::amp: // struct foo {...} & R = ... 1049 case tok::identifier: // struct foo {...} V ; 1050 case tok::r_paren: //(struct foo {...} ) {4} 1051 case tok::annot_cxxscope: // struct foo {...} a:: b; 1052 case tok::annot_typename: // struct foo {...} a ::b; 1053 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1054 case tok::l_paren: // struct foo {...} ( x); 1055 case tok::comma: // __builtin_offsetof(struct foo{...} , 1056 ExpectedSemi = false; 1057 break; 1058 // Type qualifiers 1059 case tok::kw_const: // struct foo {...} const x; 1060 case tok::kw_volatile: // struct foo {...} volatile x; 1061 case tok::kw_restrict: // struct foo {...} restrict x; 1062 case tok::kw_inline: // struct foo {...} inline foo() {}; 1063 // Storage-class specifiers 1064 case tok::kw_static: // struct foo {...} static x; 1065 case tok::kw_extern: // struct foo {...} extern x; 1066 case tok::kw_typedef: // struct foo {...} typedef x; 1067 case tok::kw_register: // struct foo {...} register x; 1068 case tok::kw_auto: // struct foo {...} auto x; 1069 case tok::kw_mutable: // struct foo {...} mutable x; 1070 // As shown above, type qualifiers and storage class specifiers absolutely 1071 // can occur after class specifiers according to the grammar. However, 1072 // almost noone actually writes code like this. If we see one of these, 1073 // it is much more likely that someone missed a semi colon and the 1074 // type/storage class specifier we're seeing is part of the *next* 1075 // intended declaration, as in: 1076 // 1077 // struct foo { ... } 1078 // typedef int X; 1079 // 1080 // We'd really like to emit a missing semicolon error instead of emitting 1081 // an error on the 'int' saying that you can't have two type specifiers in 1082 // the same declaration of X. Because of this, we look ahead past this 1083 // token to see if it's a type specifier. If so, we know the code is 1084 // otherwise invalid, so we can produce the expected semi error. 1085 if (!isKnownToBeTypeSpecifier(NextToken())) 1086 ExpectedSemi = false; 1087 break; 1088 1089 case tok::r_brace: // struct bar { struct foo {...} } 1090 // Missing ';' at end of struct is accepted as an extension in C mode. 1091 if (!getLang().CPlusPlus) 1092 ExpectedSemi = false; 1093 break; 1094 } 1095 1096 if (ExpectedSemi) { 1097 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1098 TagType == DeclSpec::TST_class ? "class" 1099 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1100 // Push this token back into the preprocessor and change our current token 1101 // to ';' so that the rest of the code recovers as though there were an 1102 // ';' after the definition. 1103 PP.EnterToken(Tok); 1104 Tok.setKind(tok::semi); 1105 } 1106 } 1107} 1108 1109/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1110/// 1111/// base-clause : [C++ class.derived] 1112/// ':' base-specifier-list 1113/// base-specifier-list: 1114/// base-specifier '...'[opt] 1115/// base-specifier-list ',' base-specifier '...'[opt] 1116void Parser::ParseBaseClause(Decl *ClassDecl) { 1117 assert(Tok.is(tok::colon) && "Not a base clause"); 1118 ConsumeToken(); 1119 1120 // Build up an array of parsed base specifiers. 1121 llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1122 1123 while (true) { 1124 // Parse a base-specifier. 1125 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1126 if (Result.isInvalid()) { 1127 // Skip the rest of this base specifier, up until the comma or 1128 // opening brace. 1129 SkipUntil(tok::comma, tok::l_brace, true, true); 1130 } else { 1131 // Add this to our array of base specifiers. 1132 BaseInfo.push_back(Result.get()); 1133 } 1134 1135 // If the next token is a comma, consume it and keep reading 1136 // base-specifiers. 1137 if (Tok.isNot(tok::comma)) break; 1138 1139 // Consume the comma. 1140 ConsumeToken(); 1141 } 1142 1143 // Attach the base specifiers 1144 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1145} 1146 1147/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1148/// one entry in the base class list of a class specifier, for example: 1149/// class foo : public bar, virtual private baz { 1150/// 'public bar' and 'virtual private baz' are each base-specifiers. 1151/// 1152/// base-specifier: [C++ class.derived] 1153/// ::[opt] nested-name-specifier[opt] class-name 1154/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1155/// class-name 1156/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1157/// class-name 1158Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1159 bool IsVirtual = false; 1160 SourceLocation StartLoc = Tok.getLocation(); 1161 1162 // Parse the 'virtual' keyword. 1163 if (Tok.is(tok::kw_virtual)) { 1164 ConsumeToken(); 1165 IsVirtual = true; 1166 } 1167 1168 // Parse an (optional) access specifier. 1169 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1170 if (Access != AS_none) 1171 ConsumeToken(); 1172 1173 // Parse the 'virtual' keyword (again!), in case it came after the 1174 // access specifier. 1175 if (Tok.is(tok::kw_virtual)) { 1176 SourceLocation VirtualLoc = ConsumeToken(); 1177 if (IsVirtual) { 1178 // Complain about duplicate 'virtual' 1179 Diag(VirtualLoc, diag::err_dup_virtual) 1180 << FixItHint::CreateRemoval(VirtualLoc); 1181 } 1182 1183 IsVirtual = true; 1184 } 1185 1186 // Parse optional '::' and optional nested-name-specifier. 1187 CXXScopeSpec SS; 1188 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1189 1190 // The location of the base class itself. 1191 SourceLocation BaseLoc = Tok.getLocation(); 1192 1193 // Parse the class-name. 1194 SourceLocation EndLocation; 1195 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1196 if (BaseType.isInvalid()) 1197 return true; 1198 1199 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1200 // actually part of the base-specifier-list grammar productions, but we 1201 // parse it here for convenience. 1202 SourceLocation EllipsisLoc; 1203 if (Tok.is(tok::ellipsis)) 1204 EllipsisLoc = ConsumeToken(); 1205 1206 // Find the complete source range for the base-specifier. 1207 SourceRange Range(StartLoc, EndLocation); 1208 1209 // Notify semantic analysis that we have parsed a complete 1210 // base-specifier. 1211 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1212 BaseType.get(), BaseLoc, EllipsisLoc); 1213} 1214 1215/// getAccessSpecifierIfPresent - Determine whether the next token is 1216/// a C++ access-specifier. 1217/// 1218/// access-specifier: [C++ class.derived] 1219/// 'private' 1220/// 'protected' 1221/// 'public' 1222AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1223 switch (Tok.getKind()) { 1224 default: return AS_none; 1225 case tok::kw_private: return AS_private; 1226 case tok::kw_protected: return AS_protected; 1227 case tok::kw_public: return AS_public; 1228 } 1229} 1230 1231void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1232 Decl *ThisDecl) { 1233 // We just declared a member function. If this member function 1234 // has any default arguments, we'll need to parse them later. 1235 LateParsedMethodDeclaration *LateMethod = 0; 1236 DeclaratorChunk::FunctionTypeInfo &FTI 1237 = DeclaratorInfo.getFunctionTypeInfo(); 1238 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1239 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1240 if (!LateMethod) { 1241 // Push this method onto the stack of late-parsed method 1242 // declarations. 1243 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1244 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1245 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1246 1247 // Add all of the parameters prior to this one (they don't 1248 // have default arguments). 1249 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1250 for (unsigned I = 0; I < ParamIdx; ++I) 1251 LateMethod->DefaultArgs.push_back( 1252 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1253 } 1254 1255 // Add this parameter to the list of parameters (it or may 1256 // not have a default argument). 1257 LateMethod->DefaultArgs.push_back( 1258 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1259 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1260 } 1261 } 1262} 1263 1264/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1265/// virt-specifier. 1266/// 1267/// virt-specifier: 1268/// override 1269/// final 1270/// new 1271VirtSpecifiers::VirtSpecifier Parser::isCXX0XVirtSpecifier() const { 1272 if (Tok.is(tok::kw_new)) 1273 return VirtSpecifiers::VS_New; 1274 1275 if (Tok.is(tok::identifier)) { 1276 IdentifierInfo *II = Tok.getIdentifierInfo(); 1277 1278 // Initialize the contextual keywords. 1279 if (!Ident_final) { 1280 Ident_final = &PP.getIdentifierTable().get("final"); 1281 Ident_override = &PP.getIdentifierTable().get("override"); 1282 } 1283 1284 if (II == Ident_override) 1285 return VirtSpecifiers::VS_Override; 1286 1287 if (II == Ident_final) 1288 return VirtSpecifiers::VS_Final; 1289 } 1290 1291 return VirtSpecifiers::VS_None; 1292} 1293 1294/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1295/// 1296/// virt-specifier-seq: 1297/// virt-specifier 1298/// virt-specifier-seq virt-specifier 1299void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1300 if (!getLang().CPlusPlus0x) 1301 return; 1302 1303 while (true) { 1304 VirtSpecifiers::VirtSpecifier Specifier = isCXX0XVirtSpecifier(); 1305 if (Specifier == VirtSpecifiers::VS_None) 1306 return; 1307 1308 // C++ [class.mem]p8: 1309 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1310 const char* PrevSpec = 0; 1311 if (VS.SetVirtSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1312 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1313 << PrevSpec 1314 << FixItHint::CreateRemoval(Tok.getLocation()); 1315 1316 ConsumeToken(); 1317 } 1318} 1319 1320/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1321/// 1322/// member-declaration: 1323/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1324/// function-definition ';'[opt] 1325/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1326/// using-declaration [TODO] 1327/// [C++0x] static_assert-declaration 1328/// template-declaration 1329/// [GNU] '__extension__' member-declaration 1330/// 1331/// member-declarator-list: 1332/// member-declarator 1333/// member-declarator-list ',' member-declarator 1334/// 1335/// member-declarator: 1336/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1337/// declarator constant-initializer[opt] 1338/// identifier[opt] ':' constant-expression 1339/// 1340/// virt-specifier-seq: 1341/// virt-specifier 1342/// virt-specifier-seq virt-specifier 1343/// 1344/// virt-specifier: 1345/// override 1346/// final 1347/// new 1348/// 1349/// pure-specifier: 1350/// '= 0' 1351/// 1352/// constant-initializer: 1353/// '=' constant-expression 1354/// 1355void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1356 const ParsedTemplateInfo &TemplateInfo, 1357 ParsingDeclRAIIObject *TemplateDiags) { 1358 // Access declarations. 1359 if (!TemplateInfo.Kind && 1360 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1361 !TryAnnotateCXXScopeToken() && 1362 Tok.is(tok::annot_cxxscope)) { 1363 bool isAccessDecl = false; 1364 if (NextToken().is(tok::identifier)) 1365 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1366 else 1367 isAccessDecl = NextToken().is(tok::kw_operator); 1368 1369 if (isAccessDecl) { 1370 // Collect the scope specifier token we annotated earlier. 1371 CXXScopeSpec SS; 1372 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1373 1374 // Try to parse an unqualified-id. 1375 UnqualifiedId Name; 1376 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1377 SkipUntil(tok::semi); 1378 return; 1379 } 1380 1381 // TODO: recover from mistakenly-qualified operator declarations. 1382 if (ExpectAndConsume(tok::semi, 1383 diag::err_expected_semi_after, 1384 "access declaration", 1385 tok::semi)) 1386 return; 1387 1388 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1389 false, SourceLocation(), 1390 SS, Name, 1391 /* AttrList */ 0, 1392 /* IsTypeName */ false, 1393 SourceLocation()); 1394 return; 1395 } 1396 } 1397 1398 // static_assert-declaration 1399 if (Tok.is(tok::kw_static_assert)) { 1400 // FIXME: Check for templates 1401 SourceLocation DeclEnd; 1402 ParseStaticAssertDeclaration(DeclEnd); 1403 return; 1404 } 1405 1406 if (Tok.is(tok::kw_template)) { 1407 assert(!TemplateInfo.TemplateParams && 1408 "Nested template improperly parsed?"); 1409 SourceLocation DeclEnd; 1410 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1411 AS); 1412 return; 1413 } 1414 1415 // Handle: member-declaration ::= '__extension__' member-declaration 1416 if (Tok.is(tok::kw___extension__)) { 1417 // __extension__ silences extension warnings in the subexpression. 1418 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1419 ConsumeToken(); 1420 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1421 } 1422 1423 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1424 // is a bitfield. 1425 ColonProtectionRAIIObject X(*this); 1426 1427 ParsedAttributesWithRange attrs; 1428 // Optional C++0x attribute-specifier 1429 MaybeParseCXX0XAttributes(attrs); 1430 MaybeParseMicrosoftAttributes(attrs); 1431 1432 if (Tok.is(tok::kw_using)) { 1433 // FIXME: Check for template aliases 1434 1435 ProhibitAttributes(attrs); 1436 1437 // Eat 'using'. 1438 SourceLocation UsingLoc = ConsumeToken(); 1439 1440 if (Tok.is(tok::kw_namespace)) { 1441 Diag(UsingLoc, diag::err_using_namespace_in_class); 1442 SkipUntil(tok::semi, true, true); 1443 } else { 1444 SourceLocation DeclEnd; 1445 // Otherwise, it must be using-declaration. 1446 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1447 UsingLoc, DeclEnd, AS); 1448 } 1449 return; 1450 } 1451 1452 // decl-specifier-seq: 1453 // Parse the common declaration-specifiers piece. 1454 ParsingDeclSpec DS(*this, TemplateDiags); 1455 DS.takeAttributesFrom(attrs); 1456 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1457 1458 MultiTemplateParamsArg TemplateParams(Actions, 1459 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1460 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1461 1462 if (Tok.is(tok::semi)) { 1463 ConsumeToken(); 1464 Decl *TheDecl = 1465 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 1466 DS.complete(TheDecl); 1467 return; 1468 } 1469 1470 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1471 1472 if (Tok.isNot(tok::colon)) { 1473 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1474 ColonProtectionRAIIObject X(*this); 1475 1476 // Parse the first declarator. 1477 ParseDeclarator(DeclaratorInfo); 1478 // Error parsing the declarator? 1479 if (!DeclaratorInfo.hasName()) { 1480 // If so, skip until the semi-colon or a }. 1481 SkipUntil(tok::r_brace, true); 1482 if (Tok.is(tok::semi)) 1483 ConsumeToken(); 1484 return; 1485 } 1486 1487 // If attributes exist after the declarator, but before an '{', parse them. 1488 MaybeParseGNUAttributes(DeclaratorInfo); 1489 1490 // function-definition: 1491 if (Tok.is(tok::l_brace) 1492 || (DeclaratorInfo.isFunctionDeclarator() && 1493 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1494 if (!DeclaratorInfo.isFunctionDeclarator()) { 1495 Diag(Tok, diag::err_func_def_no_params); 1496 ConsumeBrace(); 1497 SkipUntil(tok::r_brace, true); 1498 1499 // Consume the optional ';' 1500 if (Tok.is(tok::semi)) 1501 ConsumeToken(); 1502 return; 1503 } 1504 1505 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1506 Diag(Tok, diag::err_function_declared_typedef); 1507 // This recovery skips the entire function body. It would be nice 1508 // to simply call ParseCXXInlineMethodDef() below, however Sema 1509 // assumes the declarator represents a function, not a typedef. 1510 ConsumeBrace(); 1511 SkipUntil(tok::r_brace, true); 1512 1513 // Consume the optional ';' 1514 if (Tok.is(tok::semi)) 1515 ConsumeToken(); 1516 return; 1517 } 1518 1519 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1520 // Consume the optional ';' 1521 if (Tok.is(tok::semi)) 1522 ConsumeToken(); 1523 1524 return; 1525 } 1526 } 1527 1528 // member-declarator-list: 1529 // member-declarator 1530 // member-declarator-list ',' member-declarator 1531 1532 llvm::SmallVector<Decl *, 8> DeclsInGroup; 1533 ExprResult BitfieldSize; 1534 ExprResult Init; 1535 bool Deleted = false; 1536 1537 while (1) { 1538 // member-declarator: 1539 // declarator pure-specifier[opt] 1540 // declarator constant-initializer[opt] 1541 // identifier[opt] ':' constant-expression 1542 if (Tok.is(tok::colon)) { 1543 ConsumeToken(); 1544 BitfieldSize = ParseConstantExpression(); 1545 if (BitfieldSize.isInvalid()) 1546 SkipUntil(tok::comma, true, true); 1547 } 1548 1549 VirtSpecifiers VS; 1550 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1551 1552 // pure-specifier: 1553 // '= 0' 1554 // 1555 // constant-initializer: 1556 // '=' constant-expression 1557 // 1558 // defaulted/deleted function-definition: 1559 // '=' 'default' [TODO] 1560 // '=' 'delete' 1561 if (Tok.is(tok::equal)) { 1562 ConsumeToken(); 1563 if (Tok.is(tok::kw_delete)) { 1564 if (!getLang().CPlusPlus0x) 1565 Diag(Tok, diag::warn_deleted_function_accepted_as_extension); 1566 ConsumeToken(); 1567 Deleted = true; 1568 } else { 1569 Init = ParseInitializer(); 1570 if (Init.isInvalid()) 1571 SkipUntil(tok::comma, true, true); 1572 } 1573 } 1574 1575 // If a simple-asm-expr is present, parse it. 1576 if (Tok.is(tok::kw_asm)) { 1577 SourceLocation Loc; 1578 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1579 if (AsmLabel.isInvalid()) 1580 SkipUntil(tok::comma, true, true); 1581 1582 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1583 DeclaratorInfo.SetRangeEnd(Loc); 1584 } 1585 1586 // If attributes exist after the declarator, parse them. 1587 MaybeParseGNUAttributes(DeclaratorInfo); 1588 1589 // NOTE: If Sema is the Action module and declarator is an instance field, 1590 // this call will *not* return the created decl; It will return null. 1591 // See Sema::ActOnCXXMemberDeclarator for details. 1592 1593 Decl *ThisDecl = 0; 1594 if (DS.isFriendSpecified()) { 1595 // TODO: handle initializers, bitfields, 'delete' 1596 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1597 /*IsDefinition*/ false, 1598 move(TemplateParams)); 1599 } else { 1600 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1601 DeclaratorInfo, 1602 move(TemplateParams), 1603 BitfieldSize.release(), 1604 VS, Init.release(), 1605 /*IsDefinition*/Deleted, 1606 Deleted); 1607 } 1608 if (ThisDecl) 1609 DeclsInGroup.push_back(ThisDecl); 1610 1611 if (DeclaratorInfo.isFunctionDeclarator() && 1612 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1613 != DeclSpec::SCS_typedef) { 1614 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1615 } 1616 1617 DeclaratorInfo.complete(ThisDecl); 1618 1619 // If we don't have a comma, it is either the end of the list (a ';') 1620 // or an error, bail out. 1621 if (Tok.isNot(tok::comma)) 1622 break; 1623 1624 // Consume the comma. 1625 ConsumeToken(); 1626 1627 // Parse the next declarator. 1628 DeclaratorInfo.clear(); 1629 BitfieldSize = 0; 1630 Init = 0; 1631 Deleted = false; 1632 1633 // Attributes are only allowed on the second declarator. 1634 MaybeParseGNUAttributes(DeclaratorInfo); 1635 1636 if (Tok.isNot(tok::colon)) 1637 ParseDeclarator(DeclaratorInfo); 1638 } 1639 1640 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1641 // Skip to end of block or statement. 1642 SkipUntil(tok::r_brace, true, true); 1643 // If we stopped at a ';', eat it. 1644 if (Tok.is(tok::semi)) ConsumeToken(); 1645 return; 1646 } 1647 1648 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1649 DeclsInGroup.size()); 1650} 1651 1652/// ParseCXXMemberSpecification - Parse the class definition. 1653/// 1654/// member-specification: 1655/// member-declaration member-specification[opt] 1656/// access-specifier ':' member-specification[opt] 1657/// 1658void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1659 unsigned TagType, Decl *TagDecl) { 1660 assert((TagType == DeclSpec::TST_struct || 1661 TagType == DeclSpec::TST_union || 1662 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1663 1664 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 1665 "parsing struct/union/class body"); 1666 1667 // Determine whether this is a non-nested class. Note that local 1668 // classes are *not* considered to be nested classes. 1669 bool NonNestedClass = true; 1670 if (!ClassStack.empty()) { 1671 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 1672 if (S->isClassScope()) { 1673 // We're inside a class scope, so this is a nested class. 1674 NonNestedClass = false; 1675 break; 1676 } 1677 1678 if ((S->getFlags() & Scope::FnScope)) { 1679 // If we're in a function or function template declared in the 1680 // body of a class, then this is a local class rather than a 1681 // nested class. 1682 const Scope *Parent = S->getParent(); 1683 if (Parent->isTemplateParamScope()) 1684 Parent = Parent->getParent(); 1685 if (Parent->isClassScope()) 1686 break; 1687 } 1688 } 1689 } 1690 1691 // Enter a scope for the class. 1692 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1693 1694 // Note that we are parsing a new (potentially-nested) class definition. 1695 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1696 1697 if (TagDecl) 1698 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 1699 1700 if (Tok.is(tok::colon)) { 1701 ParseBaseClause(TagDecl); 1702 1703 if (!Tok.is(tok::l_brace)) { 1704 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1705 1706 if (TagDecl) 1707 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 1708 return; 1709 } 1710 } 1711 1712 assert(Tok.is(tok::l_brace)); 1713 1714 SourceLocation LBraceLoc = ConsumeBrace(); 1715 1716 if (TagDecl) 1717 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, LBraceLoc); 1718 1719 // C++ 11p3: Members of a class defined with the keyword class are private 1720 // by default. Members of a class defined with the keywords struct or union 1721 // are public by default. 1722 AccessSpecifier CurAS; 1723 if (TagType == DeclSpec::TST_class) 1724 CurAS = AS_private; 1725 else 1726 CurAS = AS_public; 1727 1728 SourceLocation RBraceLoc; 1729 if (TagDecl) { 1730 // While we still have something to read, read the member-declarations. 1731 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1732 // Each iteration of this loop reads one member-declaration. 1733 1734 // Check for extraneous top-level semicolon. 1735 if (Tok.is(tok::semi)) { 1736 Diag(Tok, diag::ext_extra_struct_semi) 1737 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 1738 << FixItHint::CreateRemoval(Tok.getLocation()); 1739 ConsumeToken(); 1740 continue; 1741 } 1742 1743 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1744 if (AS != AS_none) { 1745 // Current token is a C++ access specifier. 1746 CurAS = AS; 1747 SourceLocation ASLoc = Tok.getLocation(); 1748 ConsumeToken(); 1749 if (Tok.is(tok::colon)) 1750 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 1751 else 1752 Diag(Tok, diag::err_expected_colon); 1753 ConsumeToken(); 1754 continue; 1755 } 1756 1757 // FIXME: Make sure we don't have a template here. 1758 1759 // Parse all the comma separated declarators. 1760 ParseCXXClassMemberDeclaration(CurAS); 1761 } 1762 1763 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1764 } else { 1765 SkipUntil(tok::r_brace, false, false); 1766 } 1767 1768 // If attributes exist after class contents, parse them. 1769 ParsedAttributes attrs; 1770 MaybeParseGNUAttributes(attrs); 1771 1772 if (TagDecl) 1773 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 1774 LBraceLoc, RBraceLoc, 1775 attrs.getList()); 1776 1777 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1778 // complete within function bodies, default arguments, 1779 // exception-specifications, and constructor ctor-initializers (including 1780 // such things in nested classes). 1781 // 1782 // FIXME: Only function bodies and constructor ctor-initializers are 1783 // parsed correctly, fix the rest. 1784 if (TagDecl && NonNestedClass) { 1785 // We are not inside a nested class. This class and its nested classes 1786 // are complete and we can parse the delayed portions of method 1787 // declarations and the lexed inline method definitions. 1788 SourceLocation SavedPrevTokLocation = PrevTokLocation; 1789 ParseLexedMethodDeclarations(getCurrentClass()); 1790 ParseLexedMethodDefs(getCurrentClass()); 1791 PrevTokLocation = SavedPrevTokLocation; 1792 } 1793 1794 if (TagDecl) 1795 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 1796 1797 // Leave the class scope. 1798 ParsingDef.Pop(); 1799 ClassScope.Exit(); 1800} 1801 1802/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1803/// which explicitly initializes the members or base classes of a 1804/// class (C++ [class.base.init]). For example, the three initializers 1805/// after the ':' in the Derived constructor below: 1806/// 1807/// @code 1808/// class Base { }; 1809/// class Derived : Base { 1810/// int x; 1811/// float f; 1812/// public: 1813/// Derived(float f) : Base(), x(17), f(f) { } 1814/// }; 1815/// @endcode 1816/// 1817/// [C++] ctor-initializer: 1818/// ':' mem-initializer-list 1819/// 1820/// [C++] mem-initializer-list: 1821/// mem-initializer ...[opt] 1822/// mem-initializer ...[opt] , mem-initializer-list 1823void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 1824 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1825 1826 SourceLocation ColonLoc = ConsumeToken(); 1827 1828 llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers; 1829 bool AnyErrors = false; 1830 1831 do { 1832 if (Tok.is(tok::code_completion)) { 1833 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 1834 MemInitializers.data(), 1835 MemInitializers.size()); 1836 ConsumeCodeCompletionToken(); 1837 } else { 1838 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1839 if (!MemInit.isInvalid()) 1840 MemInitializers.push_back(MemInit.get()); 1841 else 1842 AnyErrors = true; 1843 } 1844 1845 if (Tok.is(tok::comma)) 1846 ConsumeToken(); 1847 else if (Tok.is(tok::l_brace)) 1848 break; 1849 // If the next token looks like a base or member initializer, assume that 1850 // we're just missing a comma. 1851 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 1852 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 1853 Diag(Loc, diag::err_ctor_init_missing_comma) 1854 << FixItHint::CreateInsertion(Loc, ", "); 1855 } else { 1856 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1857 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1858 SkipUntil(tok::l_brace, true, true); 1859 break; 1860 } 1861 } while (true); 1862 1863 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1864 MemInitializers.data(), MemInitializers.size(), 1865 AnyErrors); 1866} 1867 1868/// ParseMemInitializer - Parse a C++ member initializer, which is 1869/// part of a constructor initializer that explicitly initializes one 1870/// member or base class (C++ [class.base.init]). See 1871/// ParseConstructorInitializer for an example. 1872/// 1873/// [C++] mem-initializer: 1874/// mem-initializer-id '(' expression-list[opt] ')' 1875/// 1876/// [C++] mem-initializer-id: 1877/// '::'[opt] nested-name-specifier[opt] class-name 1878/// identifier 1879Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 1880 // parse '::'[opt] nested-name-specifier[opt] 1881 CXXScopeSpec SS; 1882 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1883 ParsedType TemplateTypeTy; 1884 if (Tok.is(tok::annot_template_id)) { 1885 TemplateIdAnnotation *TemplateId 1886 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1887 if (TemplateId->Kind == TNK_Type_template || 1888 TemplateId->Kind == TNK_Dependent_template_name) { 1889 AnnotateTemplateIdTokenAsType(&SS); 1890 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1891 TemplateTypeTy = getTypeAnnotation(Tok); 1892 } 1893 } 1894 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1895 Diag(Tok, diag::err_expected_member_or_base_name); 1896 return true; 1897 } 1898 1899 // Get the identifier. This may be a member name or a class name, 1900 // but we'll let the semantic analysis determine which it is. 1901 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1902 SourceLocation IdLoc = ConsumeToken(); 1903 1904 // Parse the '('. 1905 if (Tok.isNot(tok::l_paren)) { 1906 Diag(Tok, diag::err_expected_lparen); 1907 return true; 1908 } 1909 SourceLocation LParenLoc = ConsumeParen(); 1910 1911 // Parse the optional expression-list. 1912 ExprVector ArgExprs(Actions); 1913 CommaLocsTy CommaLocs; 1914 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1915 SkipUntil(tok::r_paren); 1916 return true; 1917 } 1918 1919 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1920 1921 SourceLocation EllipsisLoc; 1922 if (Tok.is(tok::ellipsis)) 1923 EllipsisLoc = ConsumeToken(); 1924 1925 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 1926 TemplateTypeTy, IdLoc, 1927 LParenLoc, ArgExprs.take(), 1928 ArgExprs.size(), RParenLoc, 1929 EllipsisLoc); 1930} 1931 1932/// ParseExceptionSpecification - Parse a C++ exception-specification 1933/// (C++ [except.spec]). 1934/// 1935/// exception-specification: 1936/// 'throw' '(' type-id-list [opt] ')' 1937/// [MS] 'throw' '(' '...' ')' 1938/// 1939/// type-id-list: 1940/// type-id ... [opt] 1941/// type-id-list ',' type-id ... [opt] 1942/// 1943bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 1944 llvm::SmallVectorImpl<ParsedType> 1945 &Exceptions, 1946 llvm::SmallVectorImpl<SourceRange> 1947 &Ranges, 1948 bool &hasAnyExceptionSpec) { 1949 assert(Tok.is(tok::kw_throw) && "expected throw"); 1950 1951 ConsumeToken(); 1952 1953 if (!Tok.is(tok::l_paren)) { 1954 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 1955 } 1956 SourceLocation LParenLoc = ConsumeParen(); 1957 1958 // Parse throw(...), a Microsoft extension that means "this function 1959 // can throw anything". 1960 if (Tok.is(tok::ellipsis)) { 1961 hasAnyExceptionSpec = true; 1962 SourceLocation EllipsisLoc = ConsumeToken(); 1963 if (!getLang().Microsoft) 1964 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 1965 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1966 return false; 1967 } 1968 1969 // Parse the sequence of type-ids. 1970 SourceRange Range; 1971 while (Tok.isNot(tok::r_paren)) { 1972 TypeResult Res(ParseTypeName(&Range)); 1973 1974 if (Tok.is(tok::ellipsis)) { 1975 // C++0x [temp.variadic]p5: 1976 // - In a dynamic-exception-specification (15.4); the pattern is a 1977 // type-id. 1978 SourceLocation Ellipsis = ConsumeToken(); 1979 if (!Res.isInvalid()) 1980 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 1981 } 1982 1983 if (!Res.isInvalid()) { 1984 Exceptions.push_back(Res.get()); 1985 Ranges.push_back(Range); 1986 } 1987 1988 if (Tok.is(tok::comma)) 1989 ConsumeToken(); 1990 else 1991 break; 1992 } 1993 1994 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1995 return false; 1996} 1997 1998/// ParseTrailingReturnType - Parse a trailing return type on a new-style 1999/// function declaration. 2000TypeResult Parser::ParseTrailingReturnType() { 2001 assert(Tok.is(tok::arrow) && "expected arrow"); 2002 2003 ConsumeToken(); 2004 2005 // FIXME: Need to suppress declarations when parsing this typename. 2006 // Otherwise in this function definition: 2007 // 2008 // auto f() -> struct X {} 2009 // 2010 // struct X is parsed as class definition because of the trailing 2011 // brace. 2012 2013 SourceRange Range; 2014 return ParseTypeName(&Range); 2015} 2016 2017/// \brief We have just started parsing the definition of a new class, 2018/// so push that class onto our stack of classes that is currently 2019/// being parsed. 2020void Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2021 assert((NonNestedClass || !ClassStack.empty()) && 2022 "Nested class without outer class"); 2023 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2024} 2025 2026/// \brief Deallocate the given parsed class and all of its nested 2027/// classes. 2028void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2029 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2030 delete Class->LateParsedDeclarations[I]; 2031 delete Class; 2032} 2033 2034/// \brief Pop the top class of the stack of classes that are 2035/// currently being parsed. 2036/// 2037/// This routine should be called when we have finished parsing the 2038/// definition of a class, but have not yet popped the Scope 2039/// associated with the class's definition. 2040/// 2041/// \returns true if the class we've popped is a top-level class, 2042/// false otherwise. 2043void Parser::PopParsingClass() { 2044 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2045 2046 ParsingClass *Victim = ClassStack.top(); 2047 ClassStack.pop(); 2048 if (Victim->TopLevelClass) { 2049 // Deallocate all of the nested classes of this class, 2050 // recursively: we don't need to keep any of this information. 2051 DeallocateParsedClasses(Victim); 2052 return; 2053 } 2054 assert(!ClassStack.empty() && "Missing top-level class?"); 2055 2056 if (Victim->LateParsedDeclarations.empty()) { 2057 // The victim is a nested class, but we will not need to perform 2058 // any processing after the definition of this class since it has 2059 // no members whose handling was delayed. Therefore, we can just 2060 // remove this nested class. 2061 DeallocateParsedClasses(Victim); 2062 return; 2063 } 2064 2065 // This nested class has some members that will need to be processed 2066 // after the top-level class is completely defined. Therefore, add 2067 // it to the list of nested classes within its parent. 2068 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2069 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2070 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2071} 2072 2073/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2074/// parses standard attributes. 2075/// 2076/// [C++0x] attribute-specifier: 2077/// '[' '[' attribute-list ']' ']' 2078/// 2079/// [C++0x] attribute-list: 2080/// attribute[opt] 2081/// attribute-list ',' attribute[opt] 2082/// 2083/// [C++0x] attribute: 2084/// attribute-token attribute-argument-clause[opt] 2085/// 2086/// [C++0x] attribute-token: 2087/// identifier 2088/// attribute-scoped-token 2089/// 2090/// [C++0x] attribute-scoped-token: 2091/// attribute-namespace '::' identifier 2092/// 2093/// [C++0x] attribute-namespace: 2094/// identifier 2095/// 2096/// [C++0x] attribute-argument-clause: 2097/// '(' balanced-token-seq ')' 2098/// 2099/// [C++0x] balanced-token-seq: 2100/// balanced-token 2101/// balanced-token-seq balanced-token 2102/// 2103/// [C++0x] balanced-token: 2104/// '(' balanced-token-seq ')' 2105/// '[' balanced-token-seq ']' 2106/// '{' balanced-token-seq '}' 2107/// any token but '(', ')', '[', ']', '{', or '}' 2108void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2109 SourceLocation *endLoc) { 2110 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2111 && "Not a C++0x attribute list"); 2112 2113 SourceLocation StartLoc = Tok.getLocation(), Loc; 2114 2115 ConsumeBracket(); 2116 ConsumeBracket(); 2117 2118 if (Tok.is(tok::comma)) { 2119 Diag(Tok.getLocation(), diag::err_expected_ident); 2120 ConsumeToken(); 2121 } 2122 2123 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2124 // attribute not present 2125 if (Tok.is(tok::comma)) { 2126 ConsumeToken(); 2127 continue; 2128 } 2129 2130 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2131 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2132 2133 // scoped attribute 2134 if (Tok.is(tok::coloncolon)) { 2135 ConsumeToken(); 2136 2137 if (!Tok.is(tok::identifier)) { 2138 Diag(Tok.getLocation(), diag::err_expected_ident); 2139 SkipUntil(tok::r_square, tok::comma, true, true); 2140 continue; 2141 } 2142 2143 ScopeName = AttrName; 2144 ScopeLoc = AttrLoc; 2145 2146 AttrName = Tok.getIdentifierInfo(); 2147 AttrLoc = ConsumeToken(); 2148 } 2149 2150 bool AttrParsed = false; 2151 // No scoped names are supported; ideally we could put all non-standard 2152 // attributes into namespaces. 2153 if (!ScopeName) { 2154 switch(AttributeList::getKind(AttrName)) 2155 { 2156 // No arguments 2157 case AttributeList::AT_base_check: 2158 case AttributeList::AT_carries_dependency: 2159 case AttributeList::AT_final: 2160 case AttributeList::AT_hiding: 2161 case AttributeList::AT_noreturn: 2162 case AttributeList::AT_override: { 2163 if (Tok.is(tok::l_paren)) { 2164 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2165 << AttrName->getName(); 2166 break; 2167 } 2168 2169 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 0, 2170 SourceLocation(), 0, 0, false, true)); 2171 AttrParsed = true; 2172 break; 2173 } 2174 2175 // One argument; must be a type-id or assignment-expression 2176 case AttributeList::AT_aligned: { 2177 if (Tok.isNot(tok::l_paren)) { 2178 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2179 << AttrName->getName(); 2180 break; 2181 } 2182 SourceLocation ParamLoc = ConsumeParen(); 2183 2184 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2185 2186 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2187 2188 ExprVector ArgExprs(Actions); 2189 ArgExprs.push_back(ArgExpr.release()); 2190 attrs.add(AttrFactory.Create(AttrName, AttrLoc, 0, AttrLoc, 2191 0, ParamLoc, ArgExprs.take(), 1, 2192 false, true)); 2193 2194 AttrParsed = true; 2195 break; 2196 } 2197 2198 // Silence warnings 2199 default: break; 2200 } 2201 } 2202 2203 // Skip the entire parameter clause, if any 2204 if (!AttrParsed && Tok.is(tok::l_paren)) { 2205 ConsumeParen(); 2206 // SkipUntil maintains the balancedness of tokens. 2207 SkipUntil(tok::r_paren, false); 2208 } 2209 } 2210 2211 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2212 SkipUntil(tok::r_square, false); 2213 Loc = Tok.getLocation(); 2214 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2215 SkipUntil(tok::r_square, false); 2216 2217 attrs.Range = SourceRange(StartLoc, Loc); 2218} 2219 2220/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2221/// attribute. 2222/// 2223/// FIXME: Simply returns an alignof() expression if the argument is a 2224/// type. Ideally, the type should be propagated directly into Sema. 2225/// 2226/// [C++0x] 'align' '(' type-id ')' 2227/// [C++0x] 'align' '(' assignment-expression ')' 2228ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2229 if (isTypeIdInParens()) { 2230 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2231 SourceLocation TypeLoc = Tok.getLocation(); 2232 ParsedType Ty = ParseTypeName().get(); 2233 SourceRange TypeRange(Start, Tok.getLocation()); 2234 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, 2235 Ty.getAsOpaquePtr(), TypeRange); 2236 } else 2237 return ParseConstantExpression(); 2238} 2239 2240/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2241/// 2242/// [MS] ms-attribute: 2243/// '[' token-seq ']' 2244/// 2245/// [MS] ms-attribute-seq: 2246/// ms-attribute[opt] 2247/// ms-attribute ms-attribute-seq 2248void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2249 SourceLocation *endLoc) { 2250 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2251 2252 while (Tok.is(tok::l_square)) { 2253 ConsumeBracket(); 2254 SkipUntil(tok::r_square, true, true); 2255 if (endLoc) *endLoc = Tok.getLocation(); 2256 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2257 } 2258} 2259