ParseDeclCXX.cpp revision 7a0ab5f387722c83e19c7133b46b16988eb19e45
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/Parse/Parser.h" 15#include "clang/Basic/Diagnostic.h" 16#include "clang/Parse/DeclSpec.h" 17#include "clang/Parse/Scope.h" 18#include "AstGuard.h" 19#include "ExtensionRAIIObject.h" 20using namespace clang; 21 22/// ParseNamespace - We know that the current token is a namespace keyword. This 23/// may either be a top level namespace or a block-level namespace alias. 24/// 25/// namespace-definition: [C++ 7.3: basic.namespace] 26/// named-namespace-definition 27/// unnamed-namespace-definition 28/// 29/// unnamed-namespace-definition: 30/// 'namespace' attributes[opt] '{' namespace-body '}' 31/// 32/// named-namespace-definition: 33/// original-namespace-definition 34/// extension-namespace-definition 35/// 36/// original-namespace-definition: 37/// 'namespace' identifier attributes[opt] '{' namespace-body '}' 38/// 39/// extension-namespace-definition: 40/// 'namespace' original-namespace-name '{' namespace-body '}' 41/// 42/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 43/// 'namespace' identifier '=' qualified-namespace-specifier ';' 44/// 45Parser::DeclTy *Parser::ParseNamespace(unsigned Context) { 46 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 47 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 48 49 SourceLocation IdentLoc; 50 IdentifierInfo *Ident = 0; 51 52 if (Tok.is(tok::identifier)) { 53 Ident = Tok.getIdentifierInfo(); 54 IdentLoc = ConsumeToken(); // eat the identifier. 55 } 56 57 // Read label attributes, if present. 58 DeclTy *AttrList = 0; 59 if (Tok.is(tok::kw___attribute)) 60 // FIXME: save these somewhere. 61 AttrList = ParseAttributes(); 62 63 if (Tok.is(tok::equal)) { 64 // FIXME: Verify no attributes were present. 65 // FIXME: parse this. 66 } else if (Tok.is(tok::l_brace)) { 67 68 SourceLocation LBrace = ConsumeBrace(); 69 70 // Enter a scope for the namespace. 71 ParseScope NamespaceScope(this, Scope::DeclScope); 72 73 DeclTy *NamespcDecl = 74 Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace); 75 76 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) 77 ParseExternalDeclaration(); 78 79 // Leave the namespace scope. 80 NamespaceScope.Exit(); 81 82 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 83 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBrace); 84 85 return NamespcDecl; 86 87 } else { 88 Diag(Tok, Ident ? diag::err_expected_lbrace : 89 diag::err_expected_ident_lbrace); 90 } 91 92 return 0; 93} 94 95/// ParseLinkage - We know that the current token is a string_literal 96/// and just before that, that extern was seen. 97/// 98/// linkage-specification: [C++ 7.5p2: dcl.link] 99/// 'extern' string-literal '{' declaration-seq[opt] '}' 100/// 'extern' string-literal declaration 101/// 102Parser::DeclTy *Parser::ParseLinkage(unsigned Context) { 103 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 104 llvm::SmallVector<char, 8> LangBuffer; 105 // LangBuffer is guaranteed to be big enough. 106 LangBuffer.resize(Tok.getLength()); 107 const char *LangBufPtr = &LangBuffer[0]; 108 unsigned StrSize = PP.getSpelling(Tok, LangBufPtr); 109 110 SourceLocation Loc = ConsumeStringToken(); 111 112 ParseScope LinkageScope(this, Scope::DeclScope); 113 DeclTy *LinkageSpec 114 = Actions.ActOnStartLinkageSpecification(CurScope, 115 /*FIXME: */SourceLocation(), 116 Loc, LangBufPtr, StrSize, 117 Tok.is(tok::l_brace)? Tok.getLocation() 118 : SourceLocation()); 119 120 if (Tok.isNot(tok::l_brace)) { 121 ParseDeclarationOrFunctionDefinition(); 122 return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, 123 SourceLocation()); 124 } 125 126 SourceLocation LBrace = ConsumeBrace(); 127 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 128 ParseExternalDeclaration(); 129 } 130 131 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 132 return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace); 133} 134 135/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 136/// using-directive. Assumes that current token is 'using'. 137Parser::DeclTy *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context) { 138 assert(Tok.is(tok::kw_using) && "Not using token"); 139 140 // Eat 'using'. 141 SourceLocation UsingLoc = ConsumeToken(); 142 143 if (Tok.is(tok::kw_namespace)) 144 // Next token after 'using' is 'namespace' so it must be using-directive 145 return ParseUsingDirective(Context, UsingLoc); 146 147 // Otherwise, it must be using-declaration. 148 return ParseUsingDeclaration(Context, UsingLoc); 149} 150 151/// ParseUsingDirective - Parse C++ using-directive, assumes 152/// that current token is 'namespace' and 'using' was already parsed. 153/// 154/// using-directive: [C++ 7.3.p4: namespace.udir] 155/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 156/// namespace-name ; 157/// [GNU] using-directive: 158/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 159/// namespace-name attributes[opt] ; 160/// 161Parser::DeclTy *Parser::ParseUsingDirective(unsigned Context, 162 SourceLocation UsingLoc) { 163 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 164 165 // Eat 'namespace'. 166 SourceLocation NamespcLoc = ConsumeToken(); 167 168 CXXScopeSpec SS; 169 // Parse (optional) nested-name-specifier. 170 ParseOptionalCXXScopeSpecifier(SS); 171 172 AttributeList *AttrList = 0; 173 IdentifierInfo *NamespcName = 0; 174 SourceLocation IdentLoc = SourceLocation(); 175 176 // Parse namespace-name. 177 if (!SS.isInvalid() && Tok.is(tok::identifier)) { 178 // Parse identifier. 179 NamespcName = Tok.getIdentifierInfo(); 180 IdentLoc = ConsumeToken(); 181 // Parse (optional) attributes (most likely GNU strong-using extension) 182 if (Tok.is(tok::kw___attribute)) { 183 AttrList = ParseAttributes(); 184 } 185 // Eat ';'. 186 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 187 AttrList? "attributes list" : "namespace name")) { 188 SkipUntil(tok::semi); 189 return 0; 190 } 191 } else { 192 Diag(Tok, diag::err_expected_namespace_name); 193 // If there was invalid namespace name, skip to end of decl, and eat ';'. 194 SkipUntil(tok::semi); 195 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 196 return 0; 197 } 198 199 return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS, 200 IdentLoc ,NamespcName, AttrList); 201} 202 203/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that 204/// 'using' was already seen. 205/// 206/// using-declaration: [C++ 7.3.p3: namespace.udecl] 207/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 208/// unqualified-id [TODO] 209/// 'using' :: unqualified-id [TODO] 210/// 211Parser::DeclTy *Parser::ParseUsingDeclaration(unsigned Context, 212 SourceLocation UsingLoc) { 213 assert(false && "Not implemented"); 214 // FIXME: Implement parsing. 215 return 0; 216} 217 218/// ParseClassName - Parse a C++ class-name, which names a class. Note 219/// that we only check that the result names a type; semantic analysis 220/// will need to verify that the type names a class. The result is 221/// either a type or NULL, dependending on whether a type name was 222/// found. 223/// 224/// class-name: [C++ 9.1] 225/// identifier 226/// template-id [TODO] 227/// 228Parser::TypeTy *Parser::ParseClassName(const CXXScopeSpec *SS) { 229 // Parse the class-name. 230 // FIXME: Alternatively, parse a simple-template-id. 231 if (Tok.isNot(tok::identifier)) { 232 Diag(Tok, diag::err_expected_class_name); 233 return 0; 234 } 235 236 // We have an identifier; check whether it is actually a type. 237 TypeTy *Type = Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope, SS); 238 if (!Type) { 239 Diag(Tok, diag::err_expected_class_name); 240 return 0; 241 } 242 243 // Consume the identifier. 244 ConsumeToken(); 245 246 return Type; 247} 248 249/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 250/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 251/// until we reach the start of a definition or see a token that 252/// cannot start a definition. 253/// 254/// class-specifier: [C++ class] 255/// class-head '{' member-specification[opt] '}' 256/// class-head '{' member-specification[opt] '}' attributes[opt] 257/// class-head: 258/// class-key identifier[opt] base-clause[opt] 259/// class-key nested-name-specifier identifier base-clause[opt] 260/// class-key nested-name-specifier[opt] simple-template-id 261/// base-clause[opt] 262/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 263/// [GNU] class-key attributes[opt] nested-name-specifier 264/// identifier base-clause[opt] 265/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 266/// simple-template-id base-clause[opt] 267/// class-key: 268/// 'class' 269/// 'struct' 270/// 'union' 271/// 272/// elaborated-type-specifier: [C++ dcl.type.elab] 273/// class-key ::[opt] nested-name-specifier[opt] identifier 274/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 275/// simple-template-id 276/// 277/// Note that the C++ class-specifier and elaborated-type-specifier, 278/// together, subsume the C99 struct-or-union-specifier: 279/// 280/// struct-or-union-specifier: [C99 6.7.2.1] 281/// struct-or-union identifier[opt] '{' struct-contents '}' 282/// struct-or-union identifier 283/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 284/// '}' attributes[opt] 285/// [GNU] struct-or-union attributes[opt] identifier 286/// struct-or-union: 287/// 'struct' 288/// 'union' 289void Parser::ParseClassSpecifier(DeclSpec &DS, 290 TemplateParameterLists *TemplateParams) { 291 assert((Tok.is(tok::kw_class) || 292 Tok.is(tok::kw_struct) || 293 Tok.is(tok::kw_union)) && 294 "Not a class specifier"); 295 DeclSpec::TST TagType = 296 Tok.is(tok::kw_class) ? DeclSpec::TST_class : 297 Tok.is(tok::kw_struct) ? DeclSpec::TST_struct : 298 DeclSpec::TST_union; 299 300 SourceLocation StartLoc = ConsumeToken(); 301 302 AttributeList *Attr = 0; 303 // If attributes exist after tag, parse them. 304 if (Tok.is(tok::kw___attribute)) 305 Attr = ParseAttributes(); 306 307 // If declspecs exist after tag, parse them. 308 if (Tok.is(tok::kw___declspec) && PP.getLangOptions().Microsoft) 309 FuzzyParseMicrosoftDeclSpec(); 310 311 // Parse the (optional) nested-name-specifier. 312 CXXScopeSpec SS; 313 if (getLang().CPlusPlus && ParseOptionalCXXScopeSpecifier(SS)) { 314 if (Tok.isNot(tok::identifier)) 315 Diag(Tok, diag::err_expected_ident); 316 } 317 318 // Parse the (optional) class name. 319 // FIXME: Alternatively, parse a simple-template-id. 320 IdentifierInfo *Name = 0; 321 SourceLocation NameLoc; 322 if (Tok.is(tok::identifier)) { 323 Name = Tok.getIdentifierInfo(); 324 NameLoc = ConsumeToken(); 325 } 326 327 // There are three options here. If we have 'struct foo;', then 328 // this is a forward declaration. If we have 'struct foo {...' or 329 // 'struct fo :...' then this is a definition. Otherwise we have 330 // something like 'struct foo xyz', a reference. 331 Action::TagKind TK; 332 if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))) 333 TK = Action::TK_Definition; 334 else if (Tok.is(tok::semi)) 335 TK = Action::TK_Declaration; 336 else 337 TK = Action::TK_Reference; 338 339 if (!Name && TK != Action::TK_Definition) { 340 // We have a declaration or reference to an anonymous class. 341 Diag(StartLoc, diag::err_anon_type_definition) 342 << DeclSpec::getSpecifierName(TagType); 343 344 // Skip the rest of this declarator, up until the comma or semicolon. 345 SkipUntil(tok::comma, true); 346 return; 347 } 348 349 // Parse the tag portion of this. 350 DeclTy *TagDecl 351 = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, SS, Name, 352 NameLoc, Attr, 353 Action::MultiTemplateParamsArg( 354 Actions, 355 TemplateParams? &(*TemplateParams)[0] : 0, 356 TemplateParams? TemplateParams->size() : 0)); 357 358 // Parse the optional base clause (C++ only). 359 if (getLang().CPlusPlus && Tok.is(tok::colon)) { 360 ParseBaseClause(TagDecl); 361 } 362 363 // If there is a body, parse it and inform the actions module. 364 if (Tok.is(tok::l_brace)) 365 if (getLang().CPlusPlus) 366 ParseCXXMemberSpecification(StartLoc, TagType, TagDecl); 367 else 368 ParseStructUnionBody(StartLoc, TagType, TagDecl); 369 else if (TK == Action::TK_Definition) { 370 // FIXME: Complain that we have a base-specifier list but no 371 // definition. 372 Diag(Tok, diag::err_expected_lbrace); 373 } 374 375 const char *PrevSpec = 0; 376 if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, TagDecl)) 377 Diag(StartLoc, diag::err_invalid_decl_spec_combination) << PrevSpec; 378} 379 380/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 381/// 382/// base-clause : [C++ class.derived] 383/// ':' base-specifier-list 384/// base-specifier-list: 385/// base-specifier '...'[opt] 386/// base-specifier-list ',' base-specifier '...'[opt] 387void Parser::ParseBaseClause(DeclTy *ClassDecl) 388{ 389 assert(Tok.is(tok::colon) && "Not a base clause"); 390 ConsumeToken(); 391 392 // Build up an array of parsed base specifiers. 393 llvm::SmallVector<BaseTy *, 8> BaseInfo; 394 395 while (true) { 396 // Parse a base-specifier. 397 BaseResult Result = ParseBaseSpecifier(ClassDecl); 398 if (Result.isInvalid) { 399 // Skip the rest of this base specifier, up until the comma or 400 // opening brace. 401 SkipUntil(tok::comma, tok::l_brace, true, true); 402 } else { 403 // Add this to our array of base specifiers. 404 BaseInfo.push_back(Result.Val); 405 } 406 407 // If the next token is a comma, consume it and keep reading 408 // base-specifiers. 409 if (Tok.isNot(tok::comma)) break; 410 411 // Consume the comma. 412 ConsumeToken(); 413 } 414 415 // Attach the base specifiers 416 Actions.ActOnBaseSpecifiers(ClassDecl, &BaseInfo[0], BaseInfo.size()); 417} 418 419/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 420/// one entry in the base class list of a class specifier, for example: 421/// class foo : public bar, virtual private baz { 422/// 'public bar' and 'virtual private baz' are each base-specifiers. 423/// 424/// base-specifier: [C++ class.derived] 425/// ::[opt] nested-name-specifier[opt] class-name 426/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 427/// class-name 428/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 429/// class-name 430Parser::BaseResult Parser::ParseBaseSpecifier(DeclTy *ClassDecl) 431{ 432 bool IsVirtual = false; 433 SourceLocation StartLoc = Tok.getLocation(); 434 435 // Parse the 'virtual' keyword. 436 if (Tok.is(tok::kw_virtual)) { 437 ConsumeToken(); 438 IsVirtual = true; 439 } 440 441 // Parse an (optional) access specifier. 442 AccessSpecifier Access = getAccessSpecifierIfPresent(); 443 if (Access) 444 ConsumeToken(); 445 446 // Parse the 'virtual' keyword (again!), in case it came after the 447 // access specifier. 448 if (Tok.is(tok::kw_virtual)) { 449 SourceLocation VirtualLoc = ConsumeToken(); 450 if (IsVirtual) { 451 // Complain about duplicate 'virtual' 452 Diag(VirtualLoc, diag::err_dup_virtual) 453 << SourceRange(VirtualLoc, VirtualLoc); 454 } 455 456 IsVirtual = true; 457 } 458 459 // Parse optional '::' and optional nested-name-specifier. 460 CXXScopeSpec SS; 461 ParseOptionalCXXScopeSpecifier(SS); 462 463 // The location of the base class itself. 464 SourceLocation BaseLoc = Tok.getLocation(); 465 466 // Parse the class-name. 467 TypeTy *BaseType = ParseClassName(&SS); 468 if (!BaseType) 469 return true; 470 471 // Find the complete source range for the base-specifier. 472 SourceRange Range(StartLoc, BaseLoc); 473 474 // Notify semantic analysis that we have parsed a complete 475 // base-specifier. 476 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 477 BaseType, BaseLoc); 478} 479 480/// getAccessSpecifierIfPresent - Determine whether the next token is 481/// a C++ access-specifier. 482/// 483/// access-specifier: [C++ class.derived] 484/// 'private' 485/// 'protected' 486/// 'public' 487AccessSpecifier Parser::getAccessSpecifierIfPresent() const 488{ 489 switch (Tok.getKind()) { 490 default: return AS_none; 491 case tok::kw_private: return AS_private; 492 case tok::kw_protected: return AS_protected; 493 case tok::kw_public: return AS_public; 494 } 495} 496 497/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 498/// 499/// member-declaration: 500/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 501/// function-definition ';'[opt] 502/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 503/// using-declaration [TODO] 504/// [C++0x] static_assert-declaration [TODO] 505/// template-declaration [TODO] 506/// [GNU] '__extension__' member-declaration 507/// 508/// member-declarator-list: 509/// member-declarator 510/// member-declarator-list ',' member-declarator 511/// 512/// member-declarator: 513/// declarator pure-specifier[opt] 514/// declarator constant-initializer[opt] 515/// identifier[opt] ':' constant-expression 516/// 517/// pure-specifier: [TODO] 518/// '= 0' 519/// 520/// constant-initializer: 521/// '=' constant-expression 522/// 523Parser::DeclTy *Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS) { 524 // Handle: member-declaration ::= '__extension__' member-declaration 525 if (Tok.is(tok::kw___extension__)) { 526 // __extension__ silences extension warnings in the subexpression. 527 ExtensionRAIIObject O(Diags); // Use RAII to do this. 528 ConsumeToken(); 529 return ParseCXXClassMemberDeclaration(AS); 530 } 531 532 SourceLocation DSStart = Tok.getLocation(); 533 // decl-specifier-seq: 534 // Parse the common declaration-specifiers piece. 535 DeclSpec DS; 536 ParseDeclarationSpecifiers(DS); 537 538 if (Tok.is(tok::semi)) { 539 ConsumeToken(); 540 // C++ 9.2p7: The member-declarator-list can be omitted only after a 541 // class-specifier or an enum-specifier or in a friend declaration. 542 // FIXME: Friend declarations. 543 switch (DS.getTypeSpecType()) { 544 case DeclSpec::TST_struct: 545 case DeclSpec::TST_union: 546 case DeclSpec::TST_class: 547 case DeclSpec::TST_enum: 548 return Actions.ParsedFreeStandingDeclSpec(CurScope, DS); 549 default: 550 Diag(DSStart, diag::err_no_declarators); 551 return 0; 552 } 553 } 554 555 Declarator DeclaratorInfo(DS, Declarator::MemberContext); 556 557 if (Tok.isNot(tok::colon)) { 558 // Parse the first declarator. 559 ParseDeclarator(DeclaratorInfo); 560 // Error parsing the declarator? 561 if (!DeclaratorInfo.hasName()) { 562 // If so, skip until the semi-colon or a }. 563 SkipUntil(tok::r_brace, true); 564 if (Tok.is(tok::semi)) 565 ConsumeToken(); 566 return 0; 567 } 568 569 // function-definition: 570 if (Tok.is(tok::l_brace) 571 || (DeclaratorInfo.isFunctionDeclarator() && Tok.is(tok::colon))) { 572 if (!DeclaratorInfo.isFunctionDeclarator()) { 573 Diag(Tok, diag::err_func_def_no_params); 574 ConsumeBrace(); 575 SkipUntil(tok::r_brace, true); 576 return 0; 577 } 578 579 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 580 Diag(Tok, diag::err_function_declared_typedef); 581 // This recovery skips the entire function body. It would be nice 582 // to simply call ParseCXXInlineMethodDef() below, however Sema 583 // assumes the declarator represents a function, not a typedef. 584 ConsumeBrace(); 585 SkipUntil(tok::r_brace, true); 586 return 0; 587 } 588 589 return ParseCXXInlineMethodDef(AS, DeclaratorInfo); 590 } 591 } 592 593 // member-declarator-list: 594 // member-declarator 595 // member-declarator-list ',' member-declarator 596 597 DeclTy *LastDeclInGroup = 0; 598 OwningExprResult BitfieldSize(Actions); 599 OwningExprResult Init(Actions); 600 601 while (1) { 602 603 // member-declarator: 604 // declarator pure-specifier[opt] 605 // declarator constant-initializer[opt] 606 // identifier[opt] ':' constant-expression 607 608 if (Tok.is(tok::colon)) { 609 ConsumeToken(); 610 BitfieldSize = ParseConstantExpression(); 611 if (BitfieldSize.isInvalid()) 612 SkipUntil(tok::comma, true, true); 613 } 614 615 // pure-specifier: 616 // '= 0' 617 // 618 // constant-initializer: 619 // '=' constant-expression 620 621 if (Tok.is(tok::equal)) { 622 ConsumeToken(); 623 Init = ParseInitializer(); 624 if (Init.isInvalid()) 625 SkipUntil(tok::comma, true, true); 626 } 627 628 // If attributes exist after the declarator, parse them. 629 if (Tok.is(tok::kw___attribute)) 630 DeclaratorInfo.AddAttributes(ParseAttributes()); 631 632 // NOTE: If Sema is the Action module and declarator is an instance field, 633 // this call will *not* return the created decl; LastDeclInGroup will be 634 // returned instead. 635 // See Sema::ActOnCXXMemberDeclarator for details. 636 LastDeclInGroup = Actions.ActOnCXXMemberDeclarator(CurScope, AS, 637 DeclaratorInfo, 638 BitfieldSize.release(), 639 Init.release(), 640 LastDeclInGroup); 641 642 if (DeclaratorInfo.isFunctionDeclarator() && 643 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 644 != DeclSpec::SCS_typedef) { 645 // We just declared a member function. If this member function 646 // has any default arguments, we'll need to parse them later. 647 LateParsedMethodDeclaration *LateMethod = 0; 648 DeclaratorChunk::FunctionTypeInfo &FTI 649 = DeclaratorInfo.getTypeObject(0).Fun; 650 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 651 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 652 if (!LateMethod) { 653 // Push this method onto the stack of late-parsed method 654 // declarations. 655 getCurTopClassStack().MethodDecls.push_back( 656 LateParsedMethodDeclaration(LastDeclInGroup)); 657 LateMethod = &getCurTopClassStack().MethodDecls.back(); 658 659 // Add all of the parameters prior to this one (they don't 660 // have default arguments). 661 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 662 for (unsigned I = 0; I < ParamIdx; ++I) 663 LateMethod->DefaultArgs.push_back( 664 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param)); 665 } 666 667 // Add this parameter to the list of parameters (it or may 668 // not have a default argument). 669 LateMethod->DefaultArgs.push_back( 670 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 671 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 672 } 673 } 674 } 675 676 // If we don't have a comma, it is either the end of the list (a ';') 677 // or an error, bail out. 678 if (Tok.isNot(tok::comma)) 679 break; 680 681 // Consume the comma. 682 ConsumeToken(); 683 684 // Parse the next declarator. 685 DeclaratorInfo.clear(); 686 BitfieldSize = 0; 687 Init = 0; 688 689 // Attributes are only allowed on the second declarator. 690 if (Tok.is(tok::kw___attribute)) 691 DeclaratorInfo.AddAttributes(ParseAttributes()); 692 693 if (Tok.isNot(tok::colon)) 694 ParseDeclarator(DeclaratorInfo); 695 } 696 697 if (Tok.is(tok::semi)) { 698 ConsumeToken(); 699 // Reverse the chain list. 700 return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup); 701 } 702 703 Diag(Tok, diag::err_expected_semi_decl_list); 704 // Skip to end of block or statement 705 SkipUntil(tok::r_brace, true, true); 706 if (Tok.is(tok::semi)) 707 ConsumeToken(); 708 return 0; 709} 710 711/// ParseCXXMemberSpecification - Parse the class definition. 712/// 713/// member-specification: 714/// member-declaration member-specification[opt] 715/// access-specifier ':' member-specification[opt] 716/// 717void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 718 unsigned TagType, DeclTy *TagDecl) { 719 assert((TagType == DeclSpec::TST_struct || 720 TagType == DeclSpec::TST_union || 721 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 722 723 SourceLocation LBraceLoc = ConsumeBrace(); 724 725 if (!CurScope->isCXXClassScope() && // Not about to define a nested class. 726 CurScope->isInCXXInlineMethodScope()) { 727 // We will define a local class of an inline method. 728 // Push a new LexedMethodsForTopClass for its inline methods. 729 PushTopClassStack(); 730 } 731 732 // Enter a scope for the class. 733 ParseScope ClassScope(this, Scope::CXXClassScope|Scope::DeclScope); 734 735 Actions.ActOnStartCXXClassDef(CurScope, TagDecl, LBraceLoc); 736 737 // C++ 11p3: Members of a class defined with the keyword class are private 738 // by default. Members of a class defined with the keywords struct or union 739 // are public by default. 740 AccessSpecifier CurAS; 741 if (TagType == DeclSpec::TST_class) 742 CurAS = AS_private; 743 else 744 CurAS = AS_public; 745 746 // While we still have something to read, read the member-declarations. 747 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 748 // Each iteration of this loop reads one member-declaration. 749 750 // Check for extraneous top-level semicolon. 751 if (Tok.is(tok::semi)) { 752 Diag(Tok, diag::ext_extra_struct_semi); 753 ConsumeToken(); 754 continue; 755 } 756 757 AccessSpecifier AS = getAccessSpecifierIfPresent(); 758 if (AS != AS_none) { 759 // Current token is a C++ access specifier. 760 CurAS = AS; 761 ConsumeToken(); 762 ExpectAndConsume(tok::colon, diag::err_expected_colon); 763 continue; 764 } 765 766 // Parse all the comma separated declarators. 767 ParseCXXClassMemberDeclaration(CurAS); 768 } 769 770 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 771 772 AttributeList *AttrList = 0; 773 // If attributes exist after class contents, parse them. 774 if (Tok.is(tok::kw___attribute)) 775 AttrList = ParseAttributes(); // FIXME: where should I put them? 776 777 Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl, 778 LBraceLoc, RBraceLoc); 779 780 // C++ 9.2p2: Within the class member-specification, the class is regarded as 781 // complete within function bodies, default arguments, 782 // exception-specifications, and constructor ctor-initializers (including 783 // such things in nested classes). 784 // 785 // FIXME: Only function bodies and constructor ctor-initializers are 786 // parsed correctly, fix the rest. 787 if (!CurScope->getParent()->isCXXClassScope()) { 788 // We are not inside a nested class. This class and its nested classes 789 // are complete and we can parse the delayed portions of method 790 // declarations and the lexed inline method definitions. 791 ParseLexedMethodDeclarations(); 792 ParseLexedMethodDefs(); 793 794 // For a local class of inline method, pop the LexedMethodsForTopClass that 795 // was previously pushed. 796 797 assert((CurScope->isInCXXInlineMethodScope() || 798 TopClassStacks.size() == 1) && 799 "MethodLexers not getting popped properly!"); 800 if (CurScope->isInCXXInlineMethodScope()) 801 PopTopClassStack(); 802 } 803 804 // Leave the class scope. 805 ClassScope.Exit(); 806 807 Actions.ActOnFinishCXXClassDef(TagDecl); 808} 809 810/// ParseConstructorInitializer - Parse a C++ constructor initializer, 811/// which explicitly initializes the members or base classes of a 812/// class (C++ [class.base.init]). For example, the three initializers 813/// after the ':' in the Derived constructor below: 814/// 815/// @code 816/// class Base { }; 817/// class Derived : Base { 818/// int x; 819/// float f; 820/// public: 821/// Derived(float f) : Base(), x(17), f(f) { } 822/// }; 823/// @endcode 824/// 825/// [C++] ctor-initializer: 826/// ':' mem-initializer-list 827/// 828/// [C++] mem-initializer-list: 829/// mem-initializer 830/// mem-initializer , mem-initializer-list 831void Parser::ParseConstructorInitializer(DeclTy *ConstructorDecl) { 832 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 833 834 SourceLocation ColonLoc = ConsumeToken(); 835 836 llvm::SmallVector<MemInitTy*, 4> MemInitializers; 837 838 do { 839 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 840 if (!MemInit.isInvalid) 841 MemInitializers.push_back(MemInit.Val); 842 843 if (Tok.is(tok::comma)) 844 ConsumeToken(); 845 else if (Tok.is(tok::l_brace)) 846 break; 847 else { 848 // Skip over garbage, until we get to '{'. Don't eat the '{'. 849 SkipUntil(tok::l_brace, true, true); 850 break; 851 } 852 } while (true); 853 854 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 855 &MemInitializers[0], MemInitializers.size()); 856} 857 858/// ParseMemInitializer - Parse a C++ member initializer, which is 859/// part of a constructor initializer that explicitly initializes one 860/// member or base class (C++ [class.base.init]). See 861/// ParseConstructorInitializer for an example. 862/// 863/// [C++] mem-initializer: 864/// mem-initializer-id '(' expression-list[opt] ')' 865/// 866/// [C++] mem-initializer-id: 867/// '::'[opt] nested-name-specifier[opt] class-name 868/// identifier 869Parser::MemInitResult Parser::ParseMemInitializer(DeclTy *ConstructorDecl) { 870 // FIXME: parse '::'[opt] nested-name-specifier[opt] 871 872 if (Tok.isNot(tok::identifier)) { 873 Diag(Tok, diag::err_expected_member_or_base_name); 874 return true; 875 } 876 877 // Get the identifier. This may be a member name or a class name, 878 // but we'll let the semantic analysis determine which it is. 879 IdentifierInfo *II = Tok.getIdentifierInfo(); 880 SourceLocation IdLoc = ConsumeToken(); 881 882 // Parse the '('. 883 if (Tok.isNot(tok::l_paren)) { 884 Diag(Tok, diag::err_expected_lparen); 885 return true; 886 } 887 SourceLocation LParenLoc = ConsumeParen(); 888 889 // Parse the optional expression-list. 890 ExprVector ArgExprs(Actions); 891 CommaLocsTy CommaLocs; 892 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 893 SkipUntil(tok::r_paren); 894 return true; 895 } 896 897 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 898 899 return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, II, IdLoc, 900 LParenLoc, ArgExprs.take(), 901 ArgExprs.size(), &CommaLocs[0], RParenLoc); 902} 903 904/// ParseExceptionSpecification - Parse a C++ exception-specification 905/// (C++ [except.spec]). 906/// 907/// exception-specification: 908/// 'throw' '(' type-id-list [opt] ')' 909/// [MS] 'throw' '(' '...' ')' 910/// 911/// type-id-list: 912/// type-id 913/// type-id-list ',' type-id 914/// 915bool Parser::ParseExceptionSpecification() { 916 assert(Tok.is(tok::kw_throw) && "expected throw"); 917 918 SourceLocation ThrowLoc = ConsumeToken(); 919 920 if (!Tok.is(tok::l_paren)) { 921 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 922 } 923 SourceLocation LParenLoc = ConsumeParen(); 924 925 // Parse throw(...), a Microsoft extension that means "this function 926 // can throw anything". 927 if (Tok.is(tok::ellipsis)) { 928 SourceLocation EllipsisLoc = ConsumeToken(); 929 if (!getLang().Microsoft) 930 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 931 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 932 return false; 933 } 934 935 // Parse the sequence of type-ids. 936 while (Tok.isNot(tok::r_paren)) { 937 ParseTypeName(); 938 if (Tok.is(tok::comma)) 939 ConsumeToken(); 940 else 941 break; 942 } 943 944 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 945 return false; 946} 947