ParseDeclCXX.cpp revision 99c952046600f6bfccf315aa7ad5b1be2d242cc3
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/Parse/DeclSpec.h" 18#include "clang/Parse/Scope.h" 19#include "clang/Parse/Template.h" 20#include "RAIIObjectsForParser.h" 21using namespace clang; 22 23/// ParseNamespace - We know that the current token is a namespace keyword. This 24/// may either be a top level namespace or a block-level namespace alias. 25/// 26/// namespace-definition: [C++ 7.3: basic.namespace] 27/// named-namespace-definition 28/// unnamed-namespace-definition 29/// 30/// unnamed-namespace-definition: 31/// 'namespace' attributes[opt] '{' namespace-body '}' 32/// 33/// named-namespace-definition: 34/// original-namespace-definition 35/// extension-namespace-definition 36/// 37/// original-namespace-definition: 38/// 'namespace' identifier attributes[opt] '{' namespace-body '}' 39/// 40/// extension-namespace-definition: 41/// 'namespace' original-namespace-name '{' namespace-body '}' 42/// 43/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 44/// 'namespace' identifier '=' qualified-namespace-specifier ';' 45/// 46Parser::DeclPtrTy Parser::ParseNamespace(unsigned Context, 47 SourceLocation &DeclEnd) { 48 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 49 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 50 51 if (Tok.is(tok::code_completion)) { 52 Actions.CodeCompleteNamespaceDecl(CurScope); 53 ConsumeToken(); 54 } 55 56 SourceLocation IdentLoc; 57 IdentifierInfo *Ident = 0; 58 59 Token attrTok; 60 61 if (Tok.is(tok::identifier)) { 62 Ident = Tok.getIdentifierInfo(); 63 IdentLoc = ConsumeToken(); // eat the identifier. 64 } 65 66 // Read label attributes, if present. 67 Action::AttrTy *AttrList = 0; 68 if (Tok.is(tok::kw___attribute)) { 69 attrTok = Tok; 70 71 // FIXME: save these somewhere. 72 AttrList = ParseGNUAttributes(); 73 } 74 75 if (Tok.is(tok::equal)) { 76 if (AttrList) 77 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 78 79 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 80 } 81 82 if (Tok.isNot(tok::l_brace)) { 83 Diag(Tok, Ident ? diag::err_expected_lbrace : 84 diag::err_expected_ident_lbrace); 85 return DeclPtrTy(); 86 } 87 88 SourceLocation LBrace = ConsumeBrace(); 89 90 // Enter a scope for the namespace. 91 ParseScope NamespaceScope(this, Scope::DeclScope); 92 93 DeclPtrTy NamespcDecl = 94 Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace); 95 96 PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions, 97 PP.getSourceManager(), 98 "parsing namespace"); 99 100 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 101 CXX0XAttributeList Attr; 102 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 103 Attr = ParseCXX0XAttributes(); 104 ParseExternalDeclaration(Attr); 105 } 106 107 // Leave the namespace scope. 108 NamespaceScope.Exit(); 109 110 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 111 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 112 113 DeclEnd = RBraceLoc; 114 return NamespcDecl; 115} 116 117/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 118/// alias definition. 119/// 120Parser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 121 SourceLocation AliasLoc, 122 IdentifierInfo *Alias, 123 SourceLocation &DeclEnd) { 124 assert(Tok.is(tok::equal) && "Not equal token"); 125 126 ConsumeToken(); // eat the '='. 127 128 if (Tok.is(tok::code_completion)) { 129 Actions.CodeCompleteNamespaceAliasDecl(CurScope); 130 ConsumeToken(); 131 } 132 133 CXXScopeSpec SS; 134 // Parse (optional) nested-name-specifier. 135 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 136 137 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 138 Diag(Tok, diag::err_expected_namespace_name); 139 // Skip to end of the definition and eat the ';'. 140 SkipUntil(tok::semi); 141 return DeclPtrTy(); 142 } 143 144 // Parse identifier. 145 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 146 SourceLocation IdentLoc = ConsumeToken(); 147 148 // Eat the ';'. 149 DeclEnd = Tok.getLocation(); 150 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 151 "", tok::semi); 152 153 return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias, 154 SS, IdentLoc, Ident); 155} 156 157/// ParseLinkage - We know that the current token is a string_literal 158/// and just before that, that extern was seen. 159/// 160/// linkage-specification: [C++ 7.5p2: dcl.link] 161/// 'extern' string-literal '{' declaration-seq[opt] '}' 162/// 'extern' string-literal declaration 163/// 164Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS, 165 unsigned Context) { 166 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 167 llvm::SmallVector<char, 8> LangBuffer; 168 // LangBuffer is guaranteed to be big enough. 169 LangBuffer.resize(Tok.getLength()); 170 const char *LangBufPtr = &LangBuffer[0]; 171 unsigned StrSize = PP.getSpelling(Tok, LangBufPtr); 172 173 SourceLocation Loc = ConsumeStringToken(); 174 175 ParseScope LinkageScope(this, Scope::DeclScope); 176 DeclPtrTy LinkageSpec 177 = Actions.ActOnStartLinkageSpecification(CurScope, 178 /*FIXME: */SourceLocation(), 179 Loc, LangBufPtr, StrSize, 180 Tok.is(tok::l_brace)? Tok.getLocation() 181 : SourceLocation()); 182 183 CXX0XAttributeList Attr; 184 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) { 185 Attr = ParseCXX0XAttributes(); 186 } 187 188 if (Tok.isNot(tok::l_brace)) { 189 ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList); 190 return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, 191 SourceLocation()); 192 } 193 194 if (Attr.HasAttr) 195 Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 196 << Attr.Range; 197 198 SourceLocation LBrace = ConsumeBrace(); 199 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 200 CXX0XAttributeList Attr; 201 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 202 Attr = ParseCXX0XAttributes(); 203 ParseExternalDeclaration(Attr); 204 } 205 206 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 207 return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace); 208} 209 210/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 211/// using-directive. Assumes that current token is 'using'. 212Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 213 SourceLocation &DeclEnd, 214 CXX0XAttributeList Attr) { 215 assert(Tok.is(tok::kw_using) && "Not using token"); 216 217 // Eat 'using'. 218 SourceLocation UsingLoc = ConsumeToken(); 219 220 if (Tok.is(tok::code_completion)) { 221 Actions.CodeCompleteUsing(CurScope); 222 ConsumeToken(); 223 } 224 225 if (Tok.is(tok::kw_namespace)) 226 // Next token after 'using' is 'namespace' so it must be using-directive 227 return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList); 228 229 if (Attr.HasAttr) 230 Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 231 << Attr.Range; 232 233 // Otherwise, it must be using-declaration. 234 // Ignore illegal attributes (the caller should already have issued an error. 235 return ParseUsingDeclaration(Context, UsingLoc, DeclEnd); 236} 237 238/// ParseUsingDirective - Parse C++ using-directive, assumes 239/// that current token is 'namespace' and 'using' was already parsed. 240/// 241/// using-directive: [C++ 7.3.p4: namespace.udir] 242/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 243/// namespace-name ; 244/// [GNU] using-directive: 245/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 246/// namespace-name attributes[opt] ; 247/// 248Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context, 249 SourceLocation UsingLoc, 250 SourceLocation &DeclEnd, 251 AttributeList *Attr) { 252 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 253 254 // Eat 'namespace'. 255 SourceLocation NamespcLoc = ConsumeToken(); 256 257 if (Tok.is(tok::code_completion)) { 258 Actions.CodeCompleteUsingDirective(CurScope); 259 ConsumeToken(); 260 } 261 262 CXXScopeSpec SS; 263 // Parse (optional) nested-name-specifier. 264 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 265 266 IdentifierInfo *NamespcName = 0; 267 SourceLocation IdentLoc = SourceLocation(); 268 269 // Parse namespace-name. 270 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 271 Diag(Tok, diag::err_expected_namespace_name); 272 // If there was invalid namespace name, skip to end of decl, and eat ';'. 273 SkipUntil(tok::semi); 274 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 275 return DeclPtrTy(); 276 } 277 278 // Parse identifier. 279 NamespcName = Tok.getIdentifierInfo(); 280 IdentLoc = ConsumeToken(); 281 282 // Parse (optional) attributes (most likely GNU strong-using extension). 283 bool GNUAttr = false; 284 if (Tok.is(tok::kw___attribute)) { 285 GNUAttr = true; 286 Attr = addAttributeLists(Attr, ParseGNUAttributes()); 287 } 288 289 // Eat ';'. 290 DeclEnd = Tok.getLocation(); 291 ExpectAndConsume(tok::semi, 292 GNUAttr ? diag::err_expected_semi_after_attribute_list : 293 diag::err_expected_semi_after_namespace_name, "", tok::semi); 294 295 return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS, 296 IdentLoc, NamespcName, Attr); 297} 298 299/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that 300/// 'using' was already seen. 301/// 302/// using-declaration: [C++ 7.3.p3: namespace.udecl] 303/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 304/// unqualified-id 305/// 'using' :: unqualified-id 306/// 307Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context, 308 SourceLocation UsingLoc, 309 SourceLocation &DeclEnd, 310 AccessSpecifier AS) { 311 CXXScopeSpec SS; 312 SourceLocation TypenameLoc; 313 bool IsTypeName; 314 315 // Ignore optional 'typename'. 316 // FIXME: This is wrong; we should parse this as a typename-specifier. 317 if (Tok.is(tok::kw_typename)) { 318 TypenameLoc = Tok.getLocation(); 319 ConsumeToken(); 320 IsTypeName = true; 321 } 322 else 323 IsTypeName = false; 324 325 // Parse nested-name-specifier. 326 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 327 328 AttributeList *AttrList = 0; 329 330 // Check nested-name specifier. 331 if (SS.isInvalid()) { 332 SkipUntil(tok::semi); 333 return DeclPtrTy(); 334 } 335 336 // Parse the unqualified-id. We allow parsing of both constructor and 337 // destructor names and allow the action module to diagnose any semantic 338 // errors. 339 UnqualifiedId Name; 340 if (ParseUnqualifiedId(SS, 341 /*EnteringContext=*/false, 342 /*AllowDestructorName=*/true, 343 /*AllowConstructorName=*/true, 344 /*ObjectType=*/0, 345 Name)) { 346 SkipUntil(tok::semi); 347 return DeclPtrTy(); 348 } 349 350 // Parse (optional) attributes (most likely GNU strong-using extension). 351 if (Tok.is(tok::kw___attribute)) 352 AttrList = ParseGNUAttributes(); 353 354 // Eat ';'. 355 DeclEnd = Tok.getLocation(); 356 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 357 AttrList ? "attributes list" : "using declaration", 358 tok::semi); 359 360 return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name, 361 AttrList, IsTypeName, TypenameLoc); 362} 363 364/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion. 365/// 366/// static_assert-declaration: 367/// static_assert ( constant-expression , string-literal ) ; 368/// 369Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 370 assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration"); 371 SourceLocation StaticAssertLoc = ConsumeToken(); 372 373 if (Tok.isNot(tok::l_paren)) { 374 Diag(Tok, diag::err_expected_lparen); 375 return DeclPtrTy(); 376 } 377 378 SourceLocation LParenLoc = ConsumeParen(); 379 380 OwningExprResult AssertExpr(ParseConstantExpression()); 381 if (AssertExpr.isInvalid()) { 382 SkipUntil(tok::semi); 383 return DeclPtrTy(); 384 } 385 386 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 387 return DeclPtrTy(); 388 389 if (Tok.isNot(tok::string_literal)) { 390 Diag(Tok, diag::err_expected_string_literal); 391 SkipUntil(tok::semi); 392 return DeclPtrTy(); 393 } 394 395 OwningExprResult AssertMessage(ParseStringLiteralExpression()); 396 if (AssertMessage.isInvalid()) 397 return DeclPtrTy(); 398 399 MatchRHSPunctuation(tok::r_paren, LParenLoc); 400 401 DeclEnd = Tok.getLocation(); 402 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert); 403 404 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr), 405 move(AssertMessage)); 406} 407 408/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 409/// 410/// 'decltype' ( expression ) 411/// 412void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 413 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 414 415 SourceLocation StartLoc = ConsumeToken(); 416 SourceLocation LParenLoc = Tok.getLocation(); 417 418 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 419 "decltype")) { 420 SkipUntil(tok::r_paren); 421 return; 422 } 423 424 // Parse the expression 425 426 // C++0x [dcl.type.simple]p4: 427 // The operand of the decltype specifier is an unevaluated operand. 428 EnterExpressionEvaluationContext Unevaluated(Actions, 429 Action::Unevaluated); 430 OwningExprResult Result = ParseExpression(); 431 if (Result.isInvalid()) { 432 SkipUntil(tok::r_paren); 433 return; 434 } 435 436 // Match the ')' 437 SourceLocation RParenLoc; 438 if (Tok.is(tok::r_paren)) 439 RParenLoc = ConsumeParen(); 440 else 441 MatchRHSPunctuation(tok::r_paren, LParenLoc); 442 443 if (RParenLoc.isInvalid()) 444 return; 445 446 const char *PrevSpec = 0; 447 unsigned DiagID; 448 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 449 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 450 DiagID, Result.release())) 451 Diag(StartLoc, DiagID) << PrevSpec; 452} 453 454/// ParseClassName - Parse a C++ class-name, which names a class. Note 455/// that we only check that the result names a type; semantic analysis 456/// will need to verify that the type names a class. The result is 457/// either a type or NULL, depending on whether a type name was 458/// found. 459/// 460/// class-name: [C++ 9.1] 461/// identifier 462/// simple-template-id 463/// 464Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 465 const CXXScopeSpec *SS, 466 bool DestrExpected) { 467 // Check whether we have a template-id that names a type. 468 if (Tok.is(tok::annot_template_id)) { 469 TemplateIdAnnotation *TemplateId 470 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 471 if (TemplateId->Kind == TNK_Type_template || 472 TemplateId->Kind == TNK_Dependent_template_name) { 473 AnnotateTemplateIdTokenAsType(SS); 474 475 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 476 TypeTy *Type = Tok.getAnnotationValue(); 477 EndLocation = Tok.getAnnotationEndLoc(); 478 ConsumeToken(); 479 480 if (Type) 481 return Type; 482 return true; 483 } 484 485 // Fall through to produce an error below. 486 } 487 488 if (Tok.isNot(tok::identifier)) { 489 Diag(Tok, diag::err_expected_class_name); 490 return true; 491 } 492 493 IdentifierInfo *Id = Tok.getIdentifierInfo(); 494 SourceLocation IdLoc = ConsumeToken(); 495 496 if (Tok.is(tok::less)) { 497 // It looks the user intended to write a template-id here, but the 498 // template-name was wrong. Try to fix that. 499 TemplateNameKind TNK = TNK_Type_template; 500 TemplateTy Template; 501 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, CurScope, 502 SS, Template, TNK)) { 503 Diag(IdLoc, diag::err_unknown_template_name) 504 << Id; 505 } 506 507 if (!Template) 508 return true; 509 510 // Form the template name 511 UnqualifiedId TemplateName; 512 TemplateName.setIdentifier(Id, IdLoc); 513 514 // Parse the full template-id, then turn it into a type. 515 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 516 SourceLocation(), true)) 517 return true; 518 if (TNK == TNK_Dependent_template_name) 519 AnnotateTemplateIdTokenAsType(SS); 520 521 // If we didn't end up with a typename token, there's nothing more we 522 // can do. 523 if (Tok.isNot(tok::annot_typename)) 524 return true; 525 526 // Retrieve the type from the annotation token, consume that token, and 527 // return. 528 EndLocation = Tok.getAnnotationEndLoc(); 529 TypeTy *Type = Tok.getAnnotationValue(); 530 ConsumeToken(); 531 return Type; 532 } 533 534 // We have an identifier; check whether it is actually a type. 535 TypeTy *Type = Actions.getTypeName(*Id, IdLoc, CurScope, SS, true); 536 if (!Type) { 537 Diag(IdLoc, DestrExpected ? diag::err_destructor_class_name 538 : diag::err_expected_class_name); 539 return true; 540 } 541 542 // Consume the identifier. 543 EndLocation = IdLoc; 544 return Type; 545} 546 547/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 548/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 549/// until we reach the start of a definition or see a token that 550/// cannot start a definition. 551/// 552/// class-specifier: [C++ class] 553/// class-head '{' member-specification[opt] '}' 554/// class-head '{' member-specification[opt] '}' attributes[opt] 555/// class-head: 556/// class-key identifier[opt] base-clause[opt] 557/// class-key nested-name-specifier identifier base-clause[opt] 558/// class-key nested-name-specifier[opt] simple-template-id 559/// base-clause[opt] 560/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 561/// [GNU] class-key attributes[opt] nested-name-specifier 562/// identifier base-clause[opt] 563/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 564/// simple-template-id base-clause[opt] 565/// class-key: 566/// 'class' 567/// 'struct' 568/// 'union' 569/// 570/// elaborated-type-specifier: [C++ dcl.type.elab] 571/// class-key ::[opt] nested-name-specifier[opt] identifier 572/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 573/// simple-template-id 574/// 575/// Note that the C++ class-specifier and elaborated-type-specifier, 576/// together, subsume the C99 struct-or-union-specifier: 577/// 578/// struct-or-union-specifier: [C99 6.7.2.1] 579/// struct-or-union identifier[opt] '{' struct-contents '}' 580/// struct-or-union identifier 581/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 582/// '}' attributes[opt] 583/// [GNU] struct-or-union attributes[opt] identifier 584/// struct-or-union: 585/// 'struct' 586/// 'union' 587void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 588 SourceLocation StartLoc, DeclSpec &DS, 589 const ParsedTemplateInfo &TemplateInfo, 590 AccessSpecifier AS) { 591 DeclSpec::TST TagType; 592 if (TagTokKind == tok::kw_struct) 593 TagType = DeclSpec::TST_struct; 594 else if (TagTokKind == tok::kw_class) 595 TagType = DeclSpec::TST_class; 596 else { 597 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 598 TagType = DeclSpec::TST_union; 599 } 600 601 if (Tok.is(tok::code_completion)) { 602 // Code completion for a struct, class, or union name. 603 Actions.CodeCompleteTag(CurScope, TagType); 604 ConsumeToken(); 605 } 606 607 AttributeList *AttrList = 0; 608 // If attributes exist after tag, parse them. 609 if (Tok.is(tok::kw___attribute)) 610 AttrList = ParseGNUAttributes(); 611 612 // If declspecs exist after tag, parse them. 613 if (Tok.is(tok::kw___declspec)) 614 AttrList = ParseMicrosoftDeclSpec(AttrList); 615 616 // If C++0x attributes exist here, parse them. 617 // FIXME: Are we consistent with the ordering of parsing of different 618 // styles of attributes? 619 if (isCXX0XAttributeSpecifier()) 620 AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList); 621 622 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) { 623 // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but 624 // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the 625 // token sequence "struct __is_pod", make __is_pod into a normal 626 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 627 // properly. 628 Tok.getIdentifierInfo()->setTokenID(tok::identifier); 629 Tok.setKind(tok::identifier); 630 } 631 632 if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) { 633 // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but 634 // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the 635 // token sequence "struct __is_empty", make __is_empty into a normal 636 // identifier rather than a keyword, to allow libstdc++ 4.2 to work 637 // properly. 638 Tok.getIdentifierInfo()->setTokenID(tok::identifier); 639 Tok.setKind(tok::identifier); 640 } 641 642 // Parse the (optional) nested-name-specifier. 643 CXXScopeSpec &SS = DS.getTypeSpecScope(); 644 if (getLang().CPlusPlus) { 645 // "FOO : BAR" is not a potential typo for "FOO::BAR". 646 ColonProtectionRAIIObject X(*this); 647 648 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true)) 649 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 650 Diag(Tok, diag::err_expected_ident); 651 } 652 653 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 654 655 // Parse the (optional) class name or simple-template-id. 656 IdentifierInfo *Name = 0; 657 SourceLocation NameLoc; 658 TemplateIdAnnotation *TemplateId = 0; 659 if (Tok.is(tok::identifier)) { 660 Name = Tok.getIdentifierInfo(); 661 NameLoc = ConsumeToken(); 662 663 if (Tok.is(tok::less)) { 664 // The name was supposed to refer to a template, but didn't. 665 // Eat the template argument list and try to continue parsing this as 666 // a class (or template thereof). 667 TemplateArgList TemplateArgs; 668 SourceLocation LAngleLoc, RAngleLoc; 669 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS, 670 true, LAngleLoc, 671 TemplateArgs, RAngleLoc)) { 672 // We couldn't parse the template argument list at all, so don't 673 // try to give any location information for the list. 674 LAngleLoc = RAngleLoc = SourceLocation(); 675 } 676 677 Diag(NameLoc, diag::err_explicit_spec_non_template) 678 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 679 << (TagType == DeclSpec::TST_class? 0 680 : TagType == DeclSpec::TST_struct? 1 681 : 2) 682 << Name 683 << SourceRange(LAngleLoc, RAngleLoc); 684 685 // Strip off the last template parameter list if it was empty, since 686 // we've removed its template argument list. 687 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 688 if (TemplateParams && TemplateParams->size() > 1) { 689 TemplateParams->pop_back(); 690 } else { 691 TemplateParams = 0; 692 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 693 = ParsedTemplateInfo::NonTemplate; 694 } 695 } else if (TemplateInfo.Kind 696 == ParsedTemplateInfo::ExplicitInstantiation) { 697 // Pretend this is just a forward declaration. 698 TemplateParams = 0; 699 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 700 = ParsedTemplateInfo::NonTemplate; 701 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 702 = SourceLocation(); 703 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 704 = SourceLocation(); 705 } 706 707 708 } 709 } else if (Tok.is(tok::annot_template_id)) { 710 TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 711 NameLoc = ConsumeToken(); 712 713 if (TemplateId->Kind != TNK_Type_template) { 714 // The template-name in the simple-template-id refers to 715 // something other than a class template. Give an appropriate 716 // error message and skip to the ';'. 717 SourceRange Range(NameLoc); 718 if (SS.isNotEmpty()) 719 Range.setBegin(SS.getBeginLoc()); 720 721 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 722 << Name << static_cast<int>(TemplateId->Kind) << Range; 723 724 DS.SetTypeSpecError(); 725 SkipUntil(tok::semi, false, true); 726 TemplateId->Destroy(); 727 return; 728 } 729 } 730 731 // There are four options here. If we have 'struct foo;', then this 732 // is either a forward declaration or a friend declaration, which 733 // have to be treated differently. If we have 'struct foo {...' or 734 // 'struct foo :...' then this is a definition. Otherwise we have 735 // something like 'struct foo xyz', a reference. 736 Action::TagUseKind TUK; 737 if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))) { 738 if (DS.isFriendSpecified()) { 739 // C++ [class.friend]p2: 740 // A class shall not be defined in a friend declaration. 741 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 742 << SourceRange(DS.getFriendSpecLoc()); 743 744 // Skip everything up to the semicolon, so that this looks like a proper 745 // friend class (or template thereof) declaration. 746 SkipUntil(tok::semi, true, true); 747 TUK = Action::TUK_Friend; 748 } else { 749 // Okay, this is a class definition. 750 TUK = Action::TUK_Definition; 751 } 752 } else if (Tok.is(tok::semi)) 753 TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration; 754 else 755 TUK = Action::TUK_Reference; 756 757 if (!Name && !TemplateId && TUK != Action::TUK_Definition) { 758 // We have a declaration or reference to an anonymous class. 759 Diag(StartLoc, diag::err_anon_type_definition) 760 << DeclSpec::getSpecifierName(TagType); 761 762 SkipUntil(tok::comma, true); 763 764 if (TemplateId) 765 TemplateId->Destroy(); 766 return; 767 } 768 769 // Create the tag portion of the class or class template. 770 Action::DeclResult TagOrTempResult = true; // invalid 771 Action::TypeResult TypeResult = true; // invalid 772 773 // FIXME: When TUK == TUK_Reference and we have a template-id, we need 774 // to turn that template-id into a type. 775 776 bool Owned = false; 777 if (TemplateId) { 778 // Explicit specialization, class template partial specialization, 779 // or explicit instantiation. 780 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 781 TemplateId->getTemplateArgs(), 782 TemplateId->NumArgs); 783 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 784 TUK == Action::TUK_Declaration) { 785 // This is an explicit instantiation of a class template. 786 TagOrTempResult 787 = Actions.ActOnExplicitInstantiation(CurScope, 788 TemplateInfo.ExternLoc, 789 TemplateInfo.TemplateLoc, 790 TagType, 791 StartLoc, 792 SS, 793 TemplateTy::make(TemplateId->Template), 794 TemplateId->TemplateNameLoc, 795 TemplateId->LAngleLoc, 796 TemplateArgsPtr, 797 TemplateId->RAngleLoc, 798 AttrList); 799 } else if (TUK == Action::TUK_Reference) { 800 TypeResult 801 = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template), 802 TemplateId->TemplateNameLoc, 803 TemplateId->LAngleLoc, 804 TemplateArgsPtr, 805 TemplateId->RAngleLoc); 806 807 TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK, 808 TagType, StartLoc); 809 } else { 810 // This is an explicit specialization or a class template 811 // partial specialization. 812 TemplateParameterLists FakedParamLists; 813 814 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 815 // This looks like an explicit instantiation, because we have 816 // something like 817 // 818 // template class Foo<X> 819 // 820 // but it actually has a definition. Most likely, this was 821 // meant to be an explicit specialization, but the user forgot 822 // the '<>' after 'template'. 823 assert(TUK == Action::TUK_Definition && "Expected a definition here"); 824 825 SourceLocation LAngleLoc 826 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 827 Diag(TemplateId->TemplateNameLoc, 828 diag::err_explicit_instantiation_with_definition) 829 << SourceRange(TemplateInfo.TemplateLoc) 830 << CodeModificationHint::CreateInsertion(LAngleLoc, "<>"); 831 832 // Create a fake template parameter list that contains only 833 // "template<>", so that we treat this construct as a class 834 // template specialization. 835 FakedParamLists.push_back( 836 Actions.ActOnTemplateParameterList(0, SourceLocation(), 837 TemplateInfo.TemplateLoc, 838 LAngleLoc, 839 0, 0, 840 LAngleLoc)); 841 TemplateParams = &FakedParamLists; 842 } 843 844 // Build the class template specialization. 845 TagOrTempResult 846 = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK, 847 StartLoc, SS, 848 TemplateTy::make(TemplateId->Template), 849 TemplateId->TemplateNameLoc, 850 TemplateId->LAngleLoc, 851 TemplateArgsPtr, 852 TemplateId->RAngleLoc, 853 AttrList, 854 Action::MultiTemplateParamsArg(Actions, 855 TemplateParams? &(*TemplateParams)[0] : 0, 856 TemplateParams? TemplateParams->size() : 0)); 857 } 858 TemplateId->Destroy(); 859 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 860 TUK == Action::TUK_Declaration) { 861 // Explicit instantiation of a member of a class template 862 // specialization, e.g., 863 // 864 // template struct Outer<int>::Inner; 865 // 866 TagOrTempResult 867 = Actions.ActOnExplicitInstantiation(CurScope, 868 TemplateInfo.ExternLoc, 869 TemplateInfo.TemplateLoc, 870 TagType, StartLoc, SS, Name, 871 NameLoc, AttrList); 872 } else { 873 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 874 TUK == Action::TUK_Definition) { 875 // FIXME: Diagnose this particular error. 876 } 877 878 bool IsDependent = false; 879 880 // Declaration or definition of a class type 881 TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS, 882 Name, NameLoc, AttrList, AS, 883 Action::MultiTemplateParamsArg(Actions, 884 TemplateParams? &(*TemplateParams)[0] : 0, 885 TemplateParams? TemplateParams->size() : 0), 886 Owned, IsDependent); 887 888 // If ActOnTag said the type was dependent, try again with the 889 // less common call. 890 if (IsDependent) 891 TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK, 892 SS, Name, StartLoc, NameLoc); 893 } 894 895 // If there is a body, parse it and inform the actions module. 896 if (TUK == Action::TUK_Definition) { 897 assert(Tok.is(tok::l_brace) || 898 (getLang().CPlusPlus && Tok.is(tok::colon))); 899 if (getLang().CPlusPlus) 900 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 901 else 902 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 903 } 904 905 void *Result; 906 if (!TypeResult.isInvalid()) { 907 TagType = DeclSpec::TST_typename; 908 Result = TypeResult.get(); 909 Owned = false; 910 } else if (!TagOrTempResult.isInvalid()) { 911 Result = TagOrTempResult.get().getAs<void>(); 912 } else { 913 DS.SetTypeSpecError(); 914 return; 915 } 916 917 const char *PrevSpec = 0; 918 unsigned DiagID; 919 920 // FIXME: The DeclSpec should keep the locations of both the keyword and the 921 // name (if there is one). 922 SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc; 923 924 if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID, 925 Result, Owned)) 926 Diag(StartLoc, DiagID) << PrevSpec; 927 928 // At this point, we've successfully parsed a class-specifier in 'definition' 929 // form (e.g. "struct foo { int x; }". While we could just return here, we're 930 // going to look at what comes after it to improve error recovery. If an 931 // impossible token occurs next, we assume that the programmer forgot a ; at 932 // the end of the declaration and recover that way. 933 // 934 // This switch enumerates the valid "follow" set for definition. 935 if (TUK == Action::TUK_Definition) { 936 switch (Tok.getKind()) { 937 case tok::semi: // struct foo {...} ; 938 case tok::star: // struct foo {...} * P; 939 case tok::amp: // struct foo {...} & R = ... 940 case tok::identifier: // struct foo {...} V ; 941 case tok::r_paren: //(struct foo {...} ) {4} 942 case tok::annot_cxxscope: // struct foo {...} a:: b; 943 case tok::annot_typename: // struct foo {...} a ::b; 944 case tok::annot_template_id: // struct foo {...} a<int> ::b; 945 // Storage-class specifiers 946 case tok::kw_static: // struct foo {...} static x; 947 case tok::kw_extern: // struct foo {...} extern x; 948 case tok::kw_typedef: // struct foo {...} typedef x; 949 case tok::kw_register: // struct foo {...} register x; 950 case tok::kw_auto: // struct foo {...} auto x; 951 // Type qualifiers 952 case tok::kw_const: // struct foo {...} const x; 953 case tok::kw_volatile: // struct foo {...} volatile x; 954 case tok::kw_restrict: // struct foo {...} restrict x; 955 case tok::kw_inline: // struct foo {...} inline foo() {}; 956 break; 957 958 case tok::r_brace: // struct bar { struct foo {...} } 959 // Missing ';' at end of struct is accepted as an extension in C mode. 960 if (!getLang().CPlusPlus) break; 961 // FALL THROUGH. 962 default: 963 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 964 TagType == DeclSpec::TST_class ? "class" 965 : TagType == DeclSpec::TST_struct? "struct" : "union"); 966 // Push this token back into the preprocessor and change our current token 967 // to ';' so that the rest of the code recovers as though there were an 968 // ';' after the definition. 969 PP.EnterToken(Tok); 970 Tok.setKind(tok::semi); 971 break; 972 } 973 } 974} 975 976/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 977/// 978/// base-clause : [C++ class.derived] 979/// ':' base-specifier-list 980/// base-specifier-list: 981/// base-specifier '...'[opt] 982/// base-specifier-list ',' base-specifier '...'[opt] 983void Parser::ParseBaseClause(DeclPtrTy ClassDecl) { 984 assert(Tok.is(tok::colon) && "Not a base clause"); 985 ConsumeToken(); 986 987 // Build up an array of parsed base specifiers. 988 llvm::SmallVector<BaseTy *, 8> BaseInfo; 989 990 while (true) { 991 // Parse a base-specifier. 992 BaseResult Result = ParseBaseSpecifier(ClassDecl); 993 if (Result.isInvalid()) { 994 // Skip the rest of this base specifier, up until the comma or 995 // opening brace. 996 SkipUntil(tok::comma, tok::l_brace, true, true); 997 } else { 998 // Add this to our array of base specifiers. 999 BaseInfo.push_back(Result.get()); 1000 } 1001 1002 // If the next token is a comma, consume it and keep reading 1003 // base-specifiers. 1004 if (Tok.isNot(tok::comma)) break; 1005 1006 // Consume the comma. 1007 ConsumeToken(); 1008 } 1009 1010 // Attach the base specifiers 1011 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1012} 1013 1014/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1015/// one entry in the base class list of a class specifier, for example: 1016/// class foo : public bar, virtual private baz { 1017/// 'public bar' and 'virtual private baz' are each base-specifiers. 1018/// 1019/// base-specifier: [C++ class.derived] 1020/// ::[opt] nested-name-specifier[opt] class-name 1021/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1022/// class-name 1023/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1024/// class-name 1025Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) { 1026 bool IsVirtual = false; 1027 SourceLocation StartLoc = Tok.getLocation(); 1028 1029 // Parse the 'virtual' keyword. 1030 if (Tok.is(tok::kw_virtual)) { 1031 ConsumeToken(); 1032 IsVirtual = true; 1033 } 1034 1035 // Parse an (optional) access specifier. 1036 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1037 if (Access != AS_none) 1038 ConsumeToken(); 1039 1040 // Parse the 'virtual' keyword (again!), in case it came after the 1041 // access specifier. 1042 if (Tok.is(tok::kw_virtual)) { 1043 SourceLocation VirtualLoc = ConsumeToken(); 1044 if (IsVirtual) { 1045 // Complain about duplicate 'virtual' 1046 Diag(VirtualLoc, diag::err_dup_virtual) 1047 << CodeModificationHint::CreateRemoval(VirtualLoc); 1048 } 1049 1050 IsVirtual = true; 1051 } 1052 1053 // Parse optional '::' and optional nested-name-specifier. 1054 CXXScopeSpec SS; 1055 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true); 1056 1057 // The location of the base class itself. 1058 SourceLocation BaseLoc = Tok.getLocation(); 1059 1060 // Parse the class-name. 1061 SourceLocation EndLocation; 1062 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1063 if (BaseType.isInvalid()) 1064 return true; 1065 1066 // Find the complete source range for the base-specifier. 1067 SourceRange Range(StartLoc, EndLocation); 1068 1069 // Notify semantic analysis that we have parsed a complete 1070 // base-specifier. 1071 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1072 BaseType.get(), BaseLoc); 1073} 1074 1075/// getAccessSpecifierIfPresent - Determine whether the next token is 1076/// a C++ access-specifier. 1077/// 1078/// access-specifier: [C++ class.derived] 1079/// 'private' 1080/// 'protected' 1081/// 'public' 1082AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1083 switch (Tok.getKind()) { 1084 default: return AS_none; 1085 case tok::kw_private: return AS_private; 1086 case tok::kw_protected: return AS_protected; 1087 case tok::kw_public: return AS_public; 1088 } 1089} 1090 1091void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1092 DeclPtrTy ThisDecl) { 1093 // We just declared a member function. If this member function 1094 // has any default arguments, we'll need to parse them later. 1095 LateParsedMethodDeclaration *LateMethod = 0; 1096 DeclaratorChunk::FunctionTypeInfo &FTI 1097 = DeclaratorInfo.getTypeObject(0).Fun; 1098 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1099 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1100 if (!LateMethod) { 1101 // Push this method onto the stack of late-parsed method 1102 // declarations. 1103 getCurrentClass().MethodDecls.push_back( 1104 LateParsedMethodDeclaration(ThisDecl)); 1105 LateMethod = &getCurrentClass().MethodDecls.back(); 1106 LateMethod->TemplateScope = CurScope->isTemplateParamScope(); 1107 1108 // Add all of the parameters prior to this one (they don't 1109 // have default arguments). 1110 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1111 for (unsigned I = 0; I < ParamIdx; ++I) 1112 LateMethod->DefaultArgs.push_back( 1113 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param)); 1114 } 1115 1116 // Add this parameter to the list of parameters (it or may 1117 // not have a default argument). 1118 LateMethod->DefaultArgs.push_back( 1119 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1120 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1121 } 1122 } 1123} 1124 1125/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1126/// 1127/// member-declaration: 1128/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1129/// function-definition ';'[opt] 1130/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1131/// using-declaration [TODO] 1132/// [C++0x] static_assert-declaration 1133/// template-declaration 1134/// [GNU] '__extension__' member-declaration 1135/// 1136/// member-declarator-list: 1137/// member-declarator 1138/// member-declarator-list ',' member-declarator 1139/// 1140/// member-declarator: 1141/// declarator pure-specifier[opt] 1142/// declarator constant-initializer[opt] 1143/// identifier[opt] ':' constant-expression 1144/// 1145/// pure-specifier: 1146/// '= 0' 1147/// 1148/// constant-initializer: 1149/// '=' constant-expression 1150/// 1151void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1152 const ParsedTemplateInfo &TemplateInfo) { 1153 // Access declarations. 1154 if (!TemplateInfo.Kind && 1155 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1156 TryAnnotateCXXScopeToken() && 1157 Tok.is(tok::annot_cxxscope)) { 1158 bool isAccessDecl = false; 1159 if (NextToken().is(tok::identifier)) 1160 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1161 else 1162 isAccessDecl = NextToken().is(tok::kw_operator); 1163 1164 if (isAccessDecl) { 1165 // Collect the scope specifier token we annotated earlier. 1166 CXXScopeSpec SS; 1167 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false); 1168 1169 // Try to parse an unqualified-id. 1170 UnqualifiedId Name; 1171 if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) { 1172 SkipUntil(tok::semi); 1173 return; 1174 } 1175 1176 // TODO: recover from mistakenly-qualified operator declarations. 1177 if (ExpectAndConsume(tok::semi, 1178 diag::err_expected_semi_after, 1179 "access declaration", 1180 tok::semi)) 1181 return; 1182 1183 Actions.ActOnUsingDeclaration(CurScope, AS, 1184 false, SourceLocation(), 1185 SS, Name, 1186 /* AttrList */ 0, 1187 /* IsTypeName */ false, 1188 SourceLocation()); 1189 return; 1190 } 1191 } 1192 1193 // static_assert-declaration 1194 if (Tok.is(tok::kw_static_assert)) { 1195 // FIXME: Check for templates 1196 SourceLocation DeclEnd; 1197 ParseStaticAssertDeclaration(DeclEnd); 1198 return; 1199 } 1200 1201 if (Tok.is(tok::kw_template)) { 1202 assert(!TemplateInfo.TemplateParams && 1203 "Nested template improperly parsed?"); 1204 SourceLocation DeclEnd; 1205 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1206 AS); 1207 return; 1208 } 1209 1210 // Handle: member-declaration ::= '__extension__' member-declaration 1211 if (Tok.is(tok::kw___extension__)) { 1212 // __extension__ silences extension warnings in the subexpression. 1213 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1214 ConsumeToken(); 1215 return ParseCXXClassMemberDeclaration(AS, TemplateInfo); 1216 } 1217 1218 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1219 // is a bitfield. 1220 ColonProtectionRAIIObject X(*this); 1221 1222 CXX0XAttributeList AttrList; 1223 // Optional C++0x attribute-specifier 1224 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 1225 AttrList = ParseCXX0XAttributes(); 1226 1227 if (Tok.is(tok::kw_using)) { 1228 // FIXME: Check for template aliases 1229 1230 if (AttrList.HasAttr) 1231 Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed) 1232 << AttrList.Range; 1233 1234 // Eat 'using'. 1235 SourceLocation UsingLoc = ConsumeToken(); 1236 1237 if (Tok.is(tok::kw_namespace)) { 1238 Diag(UsingLoc, diag::err_using_namespace_in_class); 1239 SkipUntil(tok::semi, true, true); 1240 } else { 1241 SourceLocation DeclEnd; 1242 // Otherwise, it must be using-declaration. 1243 ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS); 1244 } 1245 return; 1246 } 1247 1248 SourceLocation DSStart = Tok.getLocation(); 1249 // decl-specifier-seq: 1250 // Parse the common declaration-specifiers piece. 1251 ParsingDeclSpec DS(*this); 1252 DS.AddAttributes(AttrList.AttrList); 1253 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1254 1255 Action::MultiTemplateParamsArg TemplateParams(Actions, 1256 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1257 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1258 1259 if (Tok.is(tok::semi)) { 1260 ConsumeToken(); 1261 Actions.ParsedFreeStandingDeclSpec(CurScope, DS); 1262 return; 1263 } 1264 1265 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1266 1267 if (Tok.isNot(tok::colon)) { 1268 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1269 ColonProtectionRAIIObject X(*this); 1270 1271 // Parse the first declarator. 1272 ParseDeclarator(DeclaratorInfo); 1273 // Error parsing the declarator? 1274 if (!DeclaratorInfo.hasName()) { 1275 // If so, skip until the semi-colon or a }. 1276 SkipUntil(tok::r_brace, true); 1277 if (Tok.is(tok::semi)) 1278 ConsumeToken(); 1279 return; 1280 } 1281 1282 // If attributes exist after the declarator, but before an '{', parse them. 1283 if (Tok.is(tok::kw___attribute)) { 1284 SourceLocation Loc; 1285 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1286 DeclaratorInfo.AddAttributes(AttrList, Loc); 1287 } 1288 1289 // function-definition: 1290 if (Tok.is(tok::l_brace) 1291 || (DeclaratorInfo.isFunctionDeclarator() && 1292 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1293 if (!DeclaratorInfo.isFunctionDeclarator()) { 1294 Diag(Tok, diag::err_func_def_no_params); 1295 ConsumeBrace(); 1296 SkipUntil(tok::r_brace, true); 1297 return; 1298 } 1299 1300 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1301 Diag(Tok, diag::err_function_declared_typedef); 1302 // This recovery skips the entire function body. It would be nice 1303 // to simply call ParseCXXInlineMethodDef() below, however Sema 1304 // assumes the declarator represents a function, not a typedef. 1305 ConsumeBrace(); 1306 SkipUntil(tok::r_brace, true); 1307 return; 1308 } 1309 1310 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1311 return; 1312 } 1313 } 1314 1315 // member-declarator-list: 1316 // member-declarator 1317 // member-declarator-list ',' member-declarator 1318 1319 llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup; 1320 OwningExprResult BitfieldSize(Actions); 1321 OwningExprResult Init(Actions); 1322 bool Deleted = false; 1323 1324 while (1) { 1325 // member-declarator: 1326 // declarator pure-specifier[opt] 1327 // declarator constant-initializer[opt] 1328 // identifier[opt] ':' constant-expression 1329 1330 if (Tok.is(tok::colon)) { 1331 ConsumeToken(); 1332 BitfieldSize = ParseConstantExpression(); 1333 if (BitfieldSize.isInvalid()) 1334 SkipUntil(tok::comma, true, true); 1335 } 1336 1337 // pure-specifier: 1338 // '= 0' 1339 // 1340 // constant-initializer: 1341 // '=' constant-expression 1342 // 1343 // defaulted/deleted function-definition: 1344 // '=' 'default' [TODO] 1345 // '=' 'delete' 1346 1347 if (Tok.is(tok::equal)) { 1348 ConsumeToken(); 1349 if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) { 1350 ConsumeToken(); 1351 Deleted = true; 1352 } else { 1353 Init = ParseInitializer(); 1354 if (Init.isInvalid()) 1355 SkipUntil(tok::comma, true, true); 1356 } 1357 } 1358 1359 // If attributes exist after the declarator, parse them. 1360 if (Tok.is(tok::kw___attribute)) { 1361 SourceLocation Loc; 1362 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1363 DeclaratorInfo.AddAttributes(AttrList, Loc); 1364 } 1365 1366 // NOTE: If Sema is the Action module and declarator is an instance field, 1367 // this call will *not* return the created decl; It will return null. 1368 // See Sema::ActOnCXXMemberDeclarator for details. 1369 1370 DeclPtrTy ThisDecl; 1371 if (DS.isFriendSpecified()) { 1372 // TODO: handle initializers, bitfields, 'delete' 1373 ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo, 1374 /*IsDefinition*/ false, 1375 move(TemplateParams)); 1376 } else { 1377 ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS, 1378 DeclaratorInfo, 1379 move(TemplateParams), 1380 BitfieldSize.release(), 1381 Init.release(), 1382 /*IsDefinition*/Deleted, 1383 Deleted); 1384 } 1385 if (ThisDecl) 1386 DeclsInGroup.push_back(ThisDecl); 1387 1388 if (DeclaratorInfo.isFunctionDeclarator() && 1389 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1390 != DeclSpec::SCS_typedef) { 1391 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1392 } 1393 1394 DeclaratorInfo.complete(ThisDecl); 1395 1396 // If we don't have a comma, it is either the end of the list (a ';') 1397 // or an error, bail out. 1398 if (Tok.isNot(tok::comma)) 1399 break; 1400 1401 // Consume the comma. 1402 ConsumeToken(); 1403 1404 // Parse the next declarator. 1405 DeclaratorInfo.clear(); 1406 BitfieldSize = 0; 1407 Init = 0; 1408 Deleted = false; 1409 1410 // Attributes are only allowed on the second declarator. 1411 if (Tok.is(tok::kw___attribute)) { 1412 SourceLocation Loc; 1413 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1414 DeclaratorInfo.AddAttributes(AttrList, Loc); 1415 } 1416 1417 if (Tok.isNot(tok::colon)) 1418 ParseDeclarator(DeclaratorInfo); 1419 } 1420 1421 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1422 // Skip to end of block or statement. 1423 SkipUntil(tok::r_brace, true, true); 1424 // If we stopped at a ';', eat it. 1425 if (Tok.is(tok::semi)) ConsumeToken(); 1426 return; 1427 } 1428 1429 Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(), 1430 DeclsInGroup.size()); 1431} 1432 1433/// ParseCXXMemberSpecification - Parse the class definition. 1434/// 1435/// member-specification: 1436/// member-declaration member-specification[opt] 1437/// access-specifier ':' member-specification[opt] 1438/// 1439void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1440 unsigned TagType, DeclPtrTy TagDecl) { 1441 assert((TagType == DeclSpec::TST_struct || 1442 TagType == DeclSpec::TST_union || 1443 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1444 1445 PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions, 1446 PP.getSourceManager(), 1447 "parsing struct/union/class body"); 1448 1449 // Determine whether this is a non-nested class. Note that local 1450 // classes are *not* considered to be nested classes. 1451 bool NonNestedClass = true; 1452 if (!ClassStack.empty()) { 1453 for (const Scope *S = CurScope; S; S = S->getParent()) { 1454 if (S->isClassScope()) { 1455 // We're inside a class scope, so this is a nested class. 1456 NonNestedClass = false; 1457 break; 1458 } 1459 1460 if ((S->getFlags() & Scope::FnScope)) { 1461 // If we're in a function or function template declared in the 1462 // body of a class, then this is a local class rather than a 1463 // nested class. 1464 const Scope *Parent = S->getParent(); 1465 if (Parent->isTemplateParamScope()) 1466 Parent = Parent->getParent(); 1467 if (Parent->isClassScope()) 1468 break; 1469 } 1470 } 1471 } 1472 1473 // Enter a scope for the class. 1474 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1475 1476 // Note that we are parsing a new (potentially-nested) class definition. 1477 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1478 1479 if (TagDecl) 1480 Actions.ActOnTagStartDefinition(CurScope, TagDecl); 1481 1482 if (Tok.is(tok::colon)) { 1483 ParseBaseClause(TagDecl); 1484 1485 if (!Tok.is(tok::l_brace)) { 1486 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1487 return; 1488 } 1489 } 1490 1491 assert(Tok.is(tok::l_brace)); 1492 1493 SourceLocation LBraceLoc = ConsumeBrace(); 1494 1495 if (!TagDecl) { 1496 SkipUntil(tok::r_brace, false, false); 1497 return; 1498 } 1499 1500 Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc); 1501 1502 // C++ 11p3: Members of a class defined with the keyword class are private 1503 // by default. Members of a class defined with the keywords struct or union 1504 // are public by default. 1505 AccessSpecifier CurAS; 1506 if (TagType == DeclSpec::TST_class) 1507 CurAS = AS_private; 1508 else 1509 CurAS = AS_public; 1510 1511 // While we still have something to read, read the member-declarations. 1512 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1513 // Each iteration of this loop reads one member-declaration. 1514 1515 // Check for extraneous top-level semicolon. 1516 if (Tok.is(tok::semi)) { 1517 Diag(Tok, diag::ext_extra_struct_semi) 1518 << CodeModificationHint::CreateRemoval(Tok.getLocation()); 1519 ConsumeToken(); 1520 continue; 1521 } 1522 1523 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1524 if (AS != AS_none) { 1525 // Current token is a C++ access specifier. 1526 CurAS = AS; 1527 ConsumeToken(); 1528 ExpectAndConsume(tok::colon, diag::err_expected_colon); 1529 continue; 1530 } 1531 1532 // FIXME: Make sure we don't have a template here. 1533 1534 // Parse all the comma separated declarators. 1535 ParseCXXClassMemberDeclaration(CurAS); 1536 } 1537 1538 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1539 1540 AttributeList *AttrList = 0; 1541 // If attributes exist after class contents, parse them. 1542 if (Tok.is(tok::kw___attribute)) 1543 AttrList = ParseGNUAttributes(); // FIXME: where should I put them? 1544 1545 Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl, 1546 LBraceLoc, RBraceLoc); 1547 1548 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1549 // complete within function bodies, default arguments, 1550 // exception-specifications, and constructor ctor-initializers (including 1551 // such things in nested classes). 1552 // 1553 // FIXME: Only function bodies and constructor ctor-initializers are 1554 // parsed correctly, fix the rest. 1555 if (NonNestedClass) { 1556 // We are not inside a nested class. This class and its nested classes 1557 // are complete and we can parse the delayed portions of method 1558 // declarations and the lexed inline method definitions. 1559 ParseLexedMethodDeclarations(getCurrentClass()); 1560 ParseLexedMethodDefs(getCurrentClass()); 1561 } 1562 1563 // Leave the class scope. 1564 ParsingDef.Pop(); 1565 ClassScope.Exit(); 1566 1567 Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc); 1568} 1569 1570/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1571/// which explicitly initializes the members or base classes of a 1572/// class (C++ [class.base.init]). For example, the three initializers 1573/// after the ':' in the Derived constructor below: 1574/// 1575/// @code 1576/// class Base { }; 1577/// class Derived : Base { 1578/// int x; 1579/// float f; 1580/// public: 1581/// Derived(float f) : Base(), x(17), f(f) { } 1582/// }; 1583/// @endcode 1584/// 1585/// [C++] ctor-initializer: 1586/// ':' mem-initializer-list 1587/// 1588/// [C++] mem-initializer-list: 1589/// mem-initializer 1590/// mem-initializer , mem-initializer-list 1591void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) { 1592 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1593 1594 SourceLocation ColonLoc = ConsumeToken(); 1595 1596 llvm::SmallVector<MemInitTy*, 4> MemInitializers; 1597 bool AnyErrors = false; 1598 1599 do { 1600 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1601 if (!MemInit.isInvalid()) 1602 MemInitializers.push_back(MemInit.get()); 1603 else 1604 AnyErrors = true; 1605 1606 if (Tok.is(tok::comma)) 1607 ConsumeToken(); 1608 else if (Tok.is(tok::l_brace)) 1609 break; 1610 else { 1611 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1612 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1613 SkipUntil(tok::l_brace, true, true); 1614 break; 1615 } 1616 } while (true); 1617 1618 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1619 MemInitializers.data(), MemInitializers.size(), 1620 AnyErrors); 1621} 1622 1623/// ParseMemInitializer - Parse a C++ member initializer, which is 1624/// part of a constructor initializer that explicitly initializes one 1625/// member or base class (C++ [class.base.init]). See 1626/// ParseConstructorInitializer for an example. 1627/// 1628/// [C++] mem-initializer: 1629/// mem-initializer-id '(' expression-list[opt] ')' 1630/// 1631/// [C++] mem-initializer-id: 1632/// '::'[opt] nested-name-specifier[opt] class-name 1633/// identifier 1634Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) { 1635 // parse '::'[opt] nested-name-specifier[opt] 1636 CXXScopeSpec SS; 1637 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 1638 TypeTy *TemplateTypeTy = 0; 1639 if (Tok.is(tok::annot_template_id)) { 1640 TemplateIdAnnotation *TemplateId 1641 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1642 if (TemplateId->Kind == TNK_Type_template || 1643 TemplateId->Kind == TNK_Dependent_template_name) { 1644 AnnotateTemplateIdTokenAsType(&SS); 1645 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1646 TemplateTypeTy = Tok.getAnnotationValue(); 1647 } 1648 } 1649 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1650 Diag(Tok, diag::err_expected_member_or_base_name); 1651 return true; 1652 } 1653 1654 // Get the identifier. This may be a member name or a class name, 1655 // but we'll let the semantic analysis determine which it is. 1656 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1657 SourceLocation IdLoc = ConsumeToken(); 1658 1659 // Parse the '('. 1660 if (Tok.isNot(tok::l_paren)) { 1661 Diag(Tok, diag::err_expected_lparen); 1662 return true; 1663 } 1664 SourceLocation LParenLoc = ConsumeParen(); 1665 1666 // Parse the optional expression-list. 1667 ExprVector ArgExprs(Actions); 1668 CommaLocsTy CommaLocs; 1669 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1670 SkipUntil(tok::r_paren); 1671 return true; 1672 } 1673 1674 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1675 1676 return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II, 1677 TemplateTypeTy, IdLoc, 1678 LParenLoc, ArgExprs.take(), 1679 ArgExprs.size(), CommaLocs.data(), 1680 RParenLoc); 1681} 1682 1683/// ParseExceptionSpecification - Parse a C++ exception-specification 1684/// (C++ [except.spec]). 1685/// 1686/// exception-specification: 1687/// 'throw' '(' type-id-list [opt] ')' 1688/// [MS] 'throw' '(' '...' ')' 1689/// 1690/// type-id-list: 1691/// type-id 1692/// type-id-list ',' type-id 1693/// 1694bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 1695 llvm::SmallVector<TypeTy*, 2> 1696 &Exceptions, 1697 llvm::SmallVector<SourceRange, 2> 1698 &Ranges, 1699 bool &hasAnyExceptionSpec) { 1700 assert(Tok.is(tok::kw_throw) && "expected throw"); 1701 1702 SourceLocation ThrowLoc = ConsumeToken(); 1703 1704 if (!Tok.is(tok::l_paren)) { 1705 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 1706 } 1707 SourceLocation LParenLoc = ConsumeParen(); 1708 1709 // Parse throw(...), a Microsoft extension that means "this function 1710 // can throw anything". 1711 if (Tok.is(tok::ellipsis)) { 1712 hasAnyExceptionSpec = true; 1713 SourceLocation EllipsisLoc = ConsumeToken(); 1714 if (!getLang().Microsoft) 1715 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 1716 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1717 return false; 1718 } 1719 1720 // Parse the sequence of type-ids. 1721 SourceRange Range; 1722 while (Tok.isNot(tok::r_paren)) { 1723 TypeResult Res(ParseTypeName(&Range)); 1724 if (!Res.isInvalid()) { 1725 Exceptions.push_back(Res.get()); 1726 Ranges.push_back(Range); 1727 } 1728 if (Tok.is(tok::comma)) 1729 ConsumeToken(); 1730 else 1731 break; 1732 } 1733 1734 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1735 return false; 1736} 1737 1738/// \brief We have just started parsing the definition of a new class, 1739/// so push that class onto our stack of classes that is currently 1740/// being parsed. 1741void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) { 1742 assert((NonNestedClass || !ClassStack.empty()) && 1743 "Nested class without outer class"); 1744 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 1745} 1746 1747/// \brief Deallocate the given parsed class and all of its nested 1748/// classes. 1749void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 1750 for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I) 1751 DeallocateParsedClasses(Class->NestedClasses[I]); 1752 delete Class; 1753} 1754 1755/// \brief Pop the top class of the stack of classes that are 1756/// currently being parsed. 1757/// 1758/// This routine should be called when we have finished parsing the 1759/// definition of a class, but have not yet popped the Scope 1760/// associated with the class's definition. 1761/// 1762/// \returns true if the class we've popped is a top-level class, 1763/// false otherwise. 1764void Parser::PopParsingClass() { 1765 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 1766 1767 ParsingClass *Victim = ClassStack.top(); 1768 ClassStack.pop(); 1769 if (Victim->TopLevelClass) { 1770 // Deallocate all of the nested classes of this class, 1771 // recursively: we don't need to keep any of this information. 1772 DeallocateParsedClasses(Victim); 1773 return; 1774 } 1775 assert(!ClassStack.empty() && "Missing top-level class?"); 1776 1777 if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() && 1778 Victim->NestedClasses.empty()) { 1779 // The victim is a nested class, but we will not need to perform 1780 // any processing after the definition of this class since it has 1781 // no members whose handling was delayed. Therefore, we can just 1782 // remove this nested class. 1783 delete Victim; 1784 return; 1785 } 1786 1787 // This nested class has some members that will need to be processed 1788 // after the top-level class is completely defined. Therefore, add 1789 // it to the list of nested classes within its parent. 1790 assert(CurScope->isClassScope() && "Nested class outside of class scope?"); 1791 ClassStack.top()->NestedClasses.push_back(Victim); 1792 Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope(); 1793} 1794 1795/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 1796/// parses standard attributes. 1797/// 1798/// [C++0x] attribute-specifier: 1799/// '[' '[' attribute-list ']' ']' 1800/// 1801/// [C++0x] attribute-list: 1802/// attribute[opt] 1803/// attribute-list ',' attribute[opt] 1804/// 1805/// [C++0x] attribute: 1806/// attribute-token attribute-argument-clause[opt] 1807/// 1808/// [C++0x] attribute-token: 1809/// identifier 1810/// attribute-scoped-token 1811/// 1812/// [C++0x] attribute-scoped-token: 1813/// attribute-namespace '::' identifier 1814/// 1815/// [C++0x] attribute-namespace: 1816/// identifier 1817/// 1818/// [C++0x] attribute-argument-clause: 1819/// '(' balanced-token-seq ')' 1820/// 1821/// [C++0x] balanced-token-seq: 1822/// balanced-token 1823/// balanced-token-seq balanced-token 1824/// 1825/// [C++0x] balanced-token: 1826/// '(' balanced-token-seq ')' 1827/// '[' balanced-token-seq ']' 1828/// '{' balanced-token-seq '}' 1829/// any token but '(', ')', '[', ']', '{', or '}' 1830CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) { 1831 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 1832 && "Not a C++0x attribute list"); 1833 1834 SourceLocation StartLoc = Tok.getLocation(), Loc; 1835 AttributeList *CurrAttr = 0; 1836 1837 ConsumeBracket(); 1838 ConsumeBracket(); 1839 1840 if (Tok.is(tok::comma)) { 1841 Diag(Tok.getLocation(), diag::err_expected_ident); 1842 ConsumeToken(); 1843 } 1844 1845 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 1846 // attribute not present 1847 if (Tok.is(tok::comma)) { 1848 ConsumeToken(); 1849 continue; 1850 } 1851 1852 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 1853 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 1854 1855 // scoped attribute 1856 if (Tok.is(tok::coloncolon)) { 1857 ConsumeToken(); 1858 1859 if (!Tok.is(tok::identifier)) { 1860 Diag(Tok.getLocation(), diag::err_expected_ident); 1861 SkipUntil(tok::r_square, tok::comma, true, true); 1862 continue; 1863 } 1864 1865 ScopeName = AttrName; 1866 ScopeLoc = AttrLoc; 1867 1868 AttrName = Tok.getIdentifierInfo(); 1869 AttrLoc = ConsumeToken(); 1870 } 1871 1872 bool AttrParsed = false; 1873 // No scoped names are supported; ideally we could put all non-standard 1874 // attributes into namespaces. 1875 if (!ScopeName) { 1876 switch(AttributeList::getKind(AttrName)) 1877 { 1878 // No arguments 1879 case AttributeList::AT_base_check: 1880 case AttributeList::AT_carries_dependency: 1881 case AttributeList::AT_final: 1882 case AttributeList::AT_hiding: 1883 case AttributeList::AT_noreturn: 1884 case AttributeList::AT_override: { 1885 if (Tok.is(tok::l_paren)) { 1886 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 1887 << AttrName->getName(); 1888 break; 1889 } 1890 1891 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0, 1892 SourceLocation(), 0, 0, CurrAttr, false, 1893 true); 1894 AttrParsed = true; 1895 break; 1896 } 1897 1898 // One argument; must be a type-id or assignment-expression 1899 case AttributeList::AT_aligned: { 1900 if (Tok.isNot(tok::l_paren)) { 1901 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 1902 << AttrName->getName(); 1903 break; 1904 } 1905 SourceLocation ParamLoc = ConsumeParen(); 1906 1907 OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 1908 1909 MatchRHSPunctuation(tok::r_paren, ParamLoc); 1910 1911 ExprVector ArgExprs(Actions); 1912 ArgExprs.push_back(ArgExpr.release()); 1913 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 1914 0, ParamLoc, ArgExprs.take(), 1, CurrAttr, 1915 false, true); 1916 1917 AttrParsed = true; 1918 break; 1919 } 1920 1921 // Silence warnings 1922 default: break; 1923 } 1924 } 1925 1926 // Skip the entire parameter clause, if any 1927 if (!AttrParsed && Tok.is(tok::l_paren)) { 1928 ConsumeParen(); 1929 // SkipUntil maintains the balancedness of tokens. 1930 SkipUntil(tok::r_paren, false); 1931 } 1932 } 1933 1934 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1935 SkipUntil(tok::r_square, false); 1936 Loc = Tok.getLocation(); 1937 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1938 SkipUntil(tok::r_square, false); 1939 1940 CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true); 1941 return Attr; 1942} 1943 1944/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 1945/// attribute. 1946/// 1947/// FIXME: Simply returns an alignof() expression if the argument is a 1948/// type. Ideally, the type should be propagated directly into Sema. 1949/// 1950/// [C++0x] 'align' '(' type-id ')' 1951/// [C++0x] 'align' '(' assignment-expression ')' 1952Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 1953 if (isTypeIdInParens()) { 1954 EnterExpressionEvaluationContext Unevaluated(Actions, 1955 Action::Unevaluated); 1956 SourceLocation TypeLoc = Tok.getLocation(); 1957 TypeTy *Ty = ParseTypeName().get(); 1958 SourceRange TypeRange(Start, Tok.getLocation()); 1959 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty, 1960 TypeRange); 1961 } else 1962 return ParseConstantExpression(); 1963} 1964