ParseDeclCXX.cpp revision 16acfee729e00536af827935ccfcf69be721e462
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 case tok::comma: // __builtin_offsetof(struct foo{...} , 946 // Storage-class specifiers 947 case tok::kw_static: // struct foo {...} static x; 948 case tok::kw_extern: // struct foo {...} extern x; 949 case tok::kw_typedef: // struct foo {...} typedef x; 950 case tok::kw_register: // struct foo {...} register x; 951 case tok::kw_auto: // struct foo {...} auto x; 952 // Type qualifiers 953 case tok::kw_const: // struct foo {...} const x; 954 case tok::kw_volatile: // struct foo {...} volatile x; 955 case tok::kw_restrict: // struct foo {...} restrict x; 956 case tok::kw_inline: // struct foo {...} inline foo() {}; 957 break; 958 959 case tok::r_brace: // struct bar { struct foo {...} } 960 // Missing ';' at end of struct is accepted as an extension in C mode. 961 if (!getLang().CPlusPlus) break; 962 // FALL THROUGH. 963 default: 964 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 965 TagType == DeclSpec::TST_class ? "class" 966 : TagType == DeclSpec::TST_struct? "struct" : "union"); 967 // Push this token back into the preprocessor and change our current token 968 // to ';' so that the rest of the code recovers as though there were an 969 // ';' after the definition. 970 PP.EnterToken(Tok); 971 Tok.setKind(tok::semi); 972 break; 973 } 974 } 975} 976 977/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 978/// 979/// base-clause : [C++ class.derived] 980/// ':' base-specifier-list 981/// base-specifier-list: 982/// base-specifier '...'[opt] 983/// base-specifier-list ',' base-specifier '...'[opt] 984void Parser::ParseBaseClause(DeclPtrTy ClassDecl) { 985 assert(Tok.is(tok::colon) && "Not a base clause"); 986 ConsumeToken(); 987 988 // Build up an array of parsed base specifiers. 989 llvm::SmallVector<BaseTy *, 8> BaseInfo; 990 991 while (true) { 992 // Parse a base-specifier. 993 BaseResult Result = ParseBaseSpecifier(ClassDecl); 994 if (Result.isInvalid()) { 995 // Skip the rest of this base specifier, up until the comma or 996 // opening brace. 997 SkipUntil(tok::comma, tok::l_brace, true, true); 998 } else { 999 // Add this to our array of base specifiers. 1000 BaseInfo.push_back(Result.get()); 1001 } 1002 1003 // If the next token is a comma, consume it and keep reading 1004 // base-specifiers. 1005 if (Tok.isNot(tok::comma)) break; 1006 1007 // Consume the comma. 1008 ConsumeToken(); 1009 } 1010 1011 // Attach the base specifiers 1012 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1013} 1014 1015/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1016/// one entry in the base class list of a class specifier, for example: 1017/// class foo : public bar, virtual private baz { 1018/// 'public bar' and 'virtual private baz' are each base-specifiers. 1019/// 1020/// base-specifier: [C++ class.derived] 1021/// ::[opt] nested-name-specifier[opt] class-name 1022/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1023/// class-name 1024/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1025/// class-name 1026Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) { 1027 bool IsVirtual = false; 1028 SourceLocation StartLoc = Tok.getLocation(); 1029 1030 // Parse the 'virtual' keyword. 1031 if (Tok.is(tok::kw_virtual)) { 1032 ConsumeToken(); 1033 IsVirtual = true; 1034 } 1035 1036 // Parse an (optional) access specifier. 1037 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1038 if (Access != AS_none) 1039 ConsumeToken(); 1040 1041 // Parse the 'virtual' keyword (again!), in case it came after the 1042 // access specifier. 1043 if (Tok.is(tok::kw_virtual)) { 1044 SourceLocation VirtualLoc = ConsumeToken(); 1045 if (IsVirtual) { 1046 // Complain about duplicate 'virtual' 1047 Diag(VirtualLoc, diag::err_dup_virtual) 1048 << CodeModificationHint::CreateRemoval(VirtualLoc); 1049 } 1050 1051 IsVirtual = true; 1052 } 1053 1054 // Parse optional '::' and optional nested-name-specifier. 1055 CXXScopeSpec SS; 1056 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true); 1057 1058 // The location of the base class itself. 1059 SourceLocation BaseLoc = Tok.getLocation(); 1060 1061 // Parse the class-name. 1062 SourceLocation EndLocation; 1063 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1064 if (BaseType.isInvalid()) 1065 return true; 1066 1067 // Find the complete source range for the base-specifier. 1068 SourceRange Range(StartLoc, EndLocation); 1069 1070 // Notify semantic analysis that we have parsed a complete 1071 // base-specifier. 1072 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1073 BaseType.get(), BaseLoc); 1074} 1075 1076/// getAccessSpecifierIfPresent - Determine whether the next token is 1077/// a C++ access-specifier. 1078/// 1079/// access-specifier: [C++ class.derived] 1080/// 'private' 1081/// 'protected' 1082/// 'public' 1083AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1084 switch (Tok.getKind()) { 1085 default: return AS_none; 1086 case tok::kw_private: return AS_private; 1087 case tok::kw_protected: return AS_protected; 1088 case tok::kw_public: return AS_public; 1089 } 1090} 1091 1092void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1093 DeclPtrTy ThisDecl) { 1094 // We just declared a member function. If this member function 1095 // has any default arguments, we'll need to parse them later. 1096 LateParsedMethodDeclaration *LateMethod = 0; 1097 DeclaratorChunk::FunctionTypeInfo &FTI 1098 = DeclaratorInfo.getTypeObject(0).Fun; 1099 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1100 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1101 if (!LateMethod) { 1102 // Push this method onto the stack of late-parsed method 1103 // declarations. 1104 getCurrentClass().MethodDecls.push_back( 1105 LateParsedMethodDeclaration(ThisDecl)); 1106 LateMethod = &getCurrentClass().MethodDecls.back(); 1107 LateMethod->TemplateScope = CurScope->isTemplateParamScope(); 1108 1109 // Add all of the parameters prior to this one (they don't 1110 // have default arguments). 1111 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1112 for (unsigned I = 0; I < ParamIdx; ++I) 1113 LateMethod->DefaultArgs.push_back( 1114 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param)); 1115 } 1116 1117 // Add this parameter to the list of parameters (it or may 1118 // not have a default argument). 1119 LateMethod->DefaultArgs.push_back( 1120 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1121 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1122 } 1123 } 1124} 1125 1126/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1127/// 1128/// member-declaration: 1129/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1130/// function-definition ';'[opt] 1131/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1132/// using-declaration [TODO] 1133/// [C++0x] static_assert-declaration 1134/// template-declaration 1135/// [GNU] '__extension__' member-declaration 1136/// 1137/// member-declarator-list: 1138/// member-declarator 1139/// member-declarator-list ',' member-declarator 1140/// 1141/// member-declarator: 1142/// declarator pure-specifier[opt] 1143/// declarator constant-initializer[opt] 1144/// identifier[opt] ':' constant-expression 1145/// 1146/// pure-specifier: 1147/// '= 0' 1148/// 1149/// constant-initializer: 1150/// '=' constant-expression 1151/// 1152void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1153 const ParsedTemplateInfo &TemplateInfo) { 1154 // Access declarations. 1155 if (!TemplateInfo.Kind && 1156 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1157 TryAnnotateCXXScopeToken() && 1158 Tok.is(tok::annot_cxxscope)) { 1159 bool isAccessDecl = false; 1160 if (NextToken().is(tok::identifier)) 1161 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1162 else 1163 isAccessDecl = NextToken().is(tok::kw_operator); 1164 1165 if (isAccessDecl) { 1166 // Collect the scope specifier token we annotated earlier. 1167 CXXScopeSpec SS; 1168 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false); 1169 1170 // Try to parse an unqualified-id. 1171 UnqualifiedId Name; 1172 if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) { 1173 SkipUntil(tok::semi); 1174 return; 1175 } 1176 1177 // TODO: recover from mistakenly-qualified operator declarations. 1178 if (ExpectAndConsume(tok::semi, 1179 diag::err_expected_semi_after, 1180 "access declaration", 1181 tok::semi)) 1182 return; 1183 1184 Actions.ActOnUsingDeclaration(CurScope, AS, 1185 false, SourceLocation(), 1186 SS, Name, 1187 /* AttrList */ 0, 1188 /* IsTypeName */ false, 1189 SourceLocation()); 1190 return; 1191 } 1192 } 1193 1194 // static_assert-declaration 1195 if (Tok.is(tok::kw_static_assert)) { 1196 // FIXME: Check for templates 1197 SourceLocation DeclEnd; 1198 ParseStaticAssertDeclaration(DeclEnd); 1199 return; 1200 } 1201 1202 if (Tok.is(tok::kw_template)) { 1203 assert(!TemplateInfo.TemplateParams && 1204 "Nested template improperly parsed?"); 1205 SourceLocation DeclEnd; 1206 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1207 AS); 1208 return; 1209 } 1210 1211 // Handle: member-declaration ::= '__extension__' member-declaration 1212 if (Tok.is(tok::kw___extension__)) { 1213 // __extension__ silences extension warnings in the subexpression. 1214 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1215 ConsumeToken(); 1216 return ParseCXXClassMemberDeclaration(AS, TemplateInfo); 1217 } 1218 1219 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1220 // is a bitfield. 1221 ColonProtectionRAIIObject X(*this); 1222 1223 CXX0XAttributeList AttrList; 1224 // Optional C++0x attribute-specifier 1225 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 1226 AttrList = ParseCXX0XAttributes(); 1227 1228 if (Tok.is(tok::kw_using)) { 1229 // FIXME: Check for template aliases 1230 1231 if (AttrList.HasAttr) 1232 Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed) 1233 << AttrList.Range; 1234 1235 // Eat 'using'. 1236 SourceLocation UsingLoc = ConsumeToken(); 1237 1238 if (Tok.is(tok::kw_namespace)) { 1239 Diag(UsingLoc, diag::err_using_namespace_in_class); 1240 SkipUntil(tok::semi, true, true); 1241 } else { 1242 SourceLocation DeclEnd; 1243 // Otherwise, it must be using-declaration. 1244 ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS); 1245 } 1246 return; 1247 } 1248 1249 SourceLocation DSStart = Tok.getLocation(); 1250 // decl-specifier-seq: 1251 // Parse the common declaration-specifiers piece. 1252 ParsingDeclSpec DS(*this); 1253 DS.AddAttributes(AttrList.AttrList); 1254 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1255 1256 Action::MultiTemplateParamsArg TemplateParams(Actions, 1257 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1258 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1259 1260 if (Tok.is(tok::semi)) { 1261 ConsumeToken(); 1262 Actions.ParsedFreeStandingDeclSpec(CurScope, DS); 1263 return; 1264 } 1265 1266 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1267 1268 if (Tok.isNot(tok::colon)) { 1269 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1270 ColonProtectionRAIIObject X(*this); 1271 1272 // Parse the first declarator. 1273 ParseDeclarator(DeclaratorInfo); 1274 // Error parsing the declarator? 1275 if (!DeclaratorInfo.hasName()) { 1276 // If so, skip until the semi-colon or a }. 1277 SkipUntil(tok::r_brace, true); 1278 if (Tok.is(tok::semi)) 1279 ConsumeToken(); 1280 return; 1281 } 1282 1283 // If attributes exist after the declarator, but before an '{', parse them. 1284 if (Tok.is(tok::kw___attribute)) { 1285 SourceLocation Loc; 1286 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1287 DeclaratorInfo.AddAttributes(AttrList, Loc); 1288 } 1289 1290 // function-definition: 1291 if (Tok.is(tok::l_brace) 1292 || (DeclaratorInfo.isFunctionDeclarator() && 1293 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1294 if (!DeclaratorInfo.isFunctionDeclarator()) { 1295 Diag(Tok, diag::err_func_def_no_params); 1296 ConsumeBrace(); 1297 SkipUntil(tok::r_brace, true); 1298 return; 1299 } 1300 1301 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1302 Diag(Tok, diag::err_function_declared_typedef); 1303 // This recovery skips the entire function body. It would be nice 1304 // to simply call ParseCXXInlineMethodDef() below, however Sema 1305 // assumes the declarator represents a function, not a typedef. 1306 ConsumeBrace(); 1307 SkipUntil(tok::r_brace, true); 1308 return; 1309 } 1310 1311 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1312 return; 1313 } 1314 } 1315 1316 // member-declarator-list: 1317 // member-declarator 1318 // member-declarator-list ',' member-declarator 1319 1320 llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup; 1321 OwningExprResult BitfieldSize(Actions); 1322 OwningExprResult Init(Actions); 1323 bool Deleted = false; 1324 1325 while (1) { 1326 // member-declarator: 1327 // declarator pure-specifier[opt] 1328 // declarator constant-initializer[opt] 1329 // identifier[opt] ':' constant-expression 1330 1331 if (Tok.is(tok::colon)) { 1332 ConsumeToken(); 1333 BitfieldSize = ParseConstantExpression(); 1334 if (BitfieldSize.isInvalid()) 1335 SkipUntil(tok::comma, true, true); 1336 } 1337 1338 // pure-specifier: 1339 // '= 0' 1340 // 1341 // constant-initializer: 1342 // '=' constant-expression 1343 // 1344 // defaulted/deleted function-definition: 1345 // '=' 'default' [TODO] 1346 // '=' 'delete' 1347 1348 if (Tok.is(tok::equal)) { 1349 ConsumeToken(); 1350 if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) { 1351 ConsumeToken(); 1352 Deleted = true; 1353 } else { 1354 Init = ParseInitializer(); 1355 if (Init.isInvalid()) 1356 SkipUntil(tok::comma, true, true); 1357 } 1358 } 1359 1360 // If attributes exist after the declarator, parse them. 1361 if (Tok.is(tok::kw___attribute)) { 1362 SourceLocation Loc; 1363 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1364 DeclaratorInfo.AddAttributes(AttrList, Loc); 1365 } 1366 1367 // NOTE: If Sema is the Action module and declarator is an instance field, 1368 // this call will *not* return the created decl; It will return null. 1369 // See Sema::ActOnCXXMemberDeclarator for details. 1370 1371 DeclPtrTy ThisDecl; 1372 if (DS.isFriendSpecified()) { 1373 // TODO: handle initializers, bitfields, 'delete' 1374 ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo, 1375 /*IsDefinition*/ false, 1376 move(TemplateParams)); 1377 } else { 1378 ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS, 1379 DeclaratorInfo, 1380 move(TemplateParams), 1381 BitfieldSize.release(), 1382 Init.release(), 1383 /*IsDefinition*/Deleted, 1384 Deleted); 1385 } 1386 if (ThisDecl) 1387 DeclsInGroup.push_back(ThisDecl); 1388 1389 if (DeclaratorInfo.isFunctionDeclarator() && 1390 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1391 != DeclSpec::SCS_typedef) { 1392 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1393 } 1394 1395 DeclaratorInfo.complete(ThisDecl); 1396 1397 // If we don't have a comma, it is either the end of the list (a ';') 1398 // or an error, bail out. 1399 if (Tok.isNot(tok::comma)) 1400 break; 1401 1402 // Consume the comma. 1403 ConsumeToken(); 1404 1405 // Parse the next declarator. 1406 DeclaratorInfo.clear(); 1407 BitfieldSize = 0; 1408 Init = 0; 1409 Deleted = false; 1410 1411 // Attributes are only allowed on the second declarator. 1412 if (Tok.is(tok::kw___attribute)) { 1413 SourceLocation Loc; 1414 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1415 DeclaratorInfo.AddAttributes(AttrList, Loc); 1416 } 1417 1418 if (Tok.isNot(tok::colon)) 1419 ParseDeclarator(DeclaratorInfo); 1420 } 1421 1422 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1423 // Skip to end of block or statement. 1424 SkipUntil(tok::r_brace, true, true); 1425 // If we stopped at a ';', eat it. 1426 if (Tok.is(tok::semi)) ConsumeToken(); 1427 return; 1428 } 1429 1430 Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(), 1431 DeclsInGroup.size()); 1432} 1433 1434/// ParseCXXMemberSpecification - Parse the class definition. 1435/// 1436/// member-specification: 1437/// member-declaration member-specification[opt] 1438/// access-specifier ':' member-specification[opt] 1439/// 1440void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1441 unsigned TagType, DeclPtrTy TagDecl) { 1442 assert((TagType == DeclSpec::TST_struct || 1443 TagType == DeclSpec::TST_union || 1444 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1445 1446 PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions, 1447 PP.getSourceManager(), 1448 "parsing struct/union/class body"); 1449 1450 // Determine whether this is a non-nested class. Note that local 1451 // classes are *not* considered to be nested classes. 1452 bool NonNestedClass = true; 1453 if (!ClassStack.empty()) { 1454 for (const Scope *S = CurScope; S; S = S->getParent()) { 1455 if (S->isClassScope()) { 1456 // We're inside a class scope, so this is a nested class. 1457 NonNestedClass = false; 1458 break; 1459 } 1460 1461 if ((S->getFlags() & Scope::FnScope)) { 1462 // If we're in a function or function template declared in the 1463 // body of a class, then this is a local class rather than a 1464 // nested class. 1465 const Scope *Parent = S->getParent(); 1466 if (Parent->isTemplateParamScope()) 1467 Parent = Parent->getParent(); 1468 if (Parent->isClassScope()) 1469 break; 1470 } 1471 } 1472 } 1473 1474 // Enter a scope for the class. 1475 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1476 1477 // Note that we are parsing a new (potentially-nested) class definition. 1478 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1479 1480 if (TagDecl) 1481 Actions.ActOnTagStartDefinition(CurScope, TagDecl); 1482 1483 if (Tok.is(tok::colon)) { 1484 ParseBaseClause(TagDecl); 1485 1486 if (!Tok.is(tok::l_brace)) { 1487 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1488 return; 1489 } 1490 } 1491 1492 assert(Tok.is(tok::l_brace)); 1493 1494 SourceLocation LBraceLoc = ConsumeBrace(); 1495 1496 if (!TagDecl) { 1497 SkipUntil(tok::r_brace, false, false); 1498 return; 1499 } 1500 1501 Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc); 1502 1503 // C++ 11p3: Members of a class defined with the keyword class are private 1504 // by default. Members of a class defined with the keywords struct or union 1505 // are public by default. 1506 AccessSpecifier CurAS; 1507 if (TagType == DeclSpec::TST_class) 1508 CurAS = AS_private; 1509 else 1510 CurAS = AS_public; 1511 1512 // While we still have something to read, read the member-declarations. 1513 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1514 // Each iteration of this loop reads one member-declaration. 1515 1516 // Check for extraneous top-level semicolon. 1517 if (Tok.is(tok::semi)) { 1518 Diag(Tok, diag::ext_extra_struct_semi) 1519 << CodeModificationHint::CreateRemoval(Tok.getLocation()); 1520 ConsumeToken(); 1521 continue; 1522 } 1523 1524 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1525 if (AS != AS_none) { 1526 // Current token is a C++ access specifier. 1527 CurAS = AS; 1528 ConsumeToken(); 1529 ExpectAndConsume(tok::colon, diag::err_expected_colon); 1530 continue; 1531 } 1532 1533 // FIXME: Make sure we don't have a template here. 1534 1535 // Parse all the comma separated declarators. 1536 ParseCXXClassMemberDeclaration(CurAS); 1537 } 1538 1539 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1540 1541 AttributeList *AttrList = 0; 1542 // If attributes exist after class contents, parse them. 1543 if (Tok.is(tok::kw___attribute)) 1544 AttrList = ParseGNUAttributes(); // FIXME: where should I put them? 1545 1546 Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl, 1547 LBraceLoc, RBraceLoc); 1548 1549 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1550 // complete within function bodies, default arguments, 1551 // exception-specifications, and constructor ctor-initializers (including 1552 // such things in nested classes). 1553 // 1554 // FIXME: Only function bodies and constructor ctor-initializers are 1555 // parsed correctly, fix the rest. 1556 if (NonNestedClass) { 1557 // We are not inside a nested class. This class and its nested classes 1558 // are complete and we can parse the delayed portions of method 1559 // declarations and the lexed inline method definitions. 1560 ParseLexedMethodDeclarations(getCurrentClass()); 1561 ParseLexedMethodDefs(getCurrentClass()); 1562 } 1563 1564 // Leave the class scope. 1565 ParsingDef.Pop(); 1566 ClassScope.Exit(); 1567 1568 Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc); 1569} 1570 1571/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1572/// which explicitly initializes the members or base classes of a 1573/// class (C++ [class.base.init]). For example, the three initializers 1574/// after the ':' in the Derived constructor below: 1575/// 1576/// @code 1577/// class Base { }; 1578/// class Derived : Base { 1579/// int x; 1580/// float f; 1581/// public: 1582/// Derived(float f) : Base(), x(17), f(f) { } 1583/// }; 1584/// @endcode 1585/// 1586/// [C++] ctor-initializer: 1587/// ':' mem-initializer-list 1588/// 1589/// [C++] mem-initializer-list: 1590/// mem-initializer 1591/// mem-initializer , mem-initializer-list 1592void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) { 1593 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1594 1595 SourceLocation ColonLoc = ConsumeToken(); 1596 1597 llvm::SmallVector<MemInitTy*, 4> MemInitializers; 1598 bool AnyErrors = false; 1599 1600 do { 1601 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1602 if (!MemInit.isInvalid()) 1603 MemInitializers.push_back(MemInit.get()); 1604 else 1605 AnyErrors = true; 1606 1607 if (Tok.is(tok::comma)) 1608 ConsumeToken(); 1609 else if (Tok.is(tok::l_brace)) 1610 break; 1611 else { 1612 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1613 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1614 SkipUntil(tok::l_brace, true, true); 1615 break; 1616 } 1617 } while (true); 1618 1619 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1620 MemInitializers.data(), MemInitializers.size(), 1621 AnyErrors); 1622} 1623 1624/// ParseMemInitializer - Parse a C++ member initializer, which is 1625/// part of a constructor initializer that explicitly initializes one 1626/// member or base class (C++ [class.base.init]). See 1627/// ParseConstructorInitializer for an example. 1628/// 1629/// [C++] mem-initializer: 1630/// mem-initializer-id '(' expression-list[opt] ')' 1631/// 1632/// [C++] mem-initializer-id: 1633/// '::'[opt] nested-name-specifier[opt] class-name 1634/// identifier 1635Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) { 1636 // parse '::'[opt] nested-name-specifier[opt] 1637 CXXScopeSpec SS; 1638 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 1639 TypeTy *TemplateTypeTy = 0; 1640 if (Tok.is(tok::annot_template_id)) { 1641 TemplateIdAnnotation *TemplateId 1642 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1643 if (TemplateId->Kind == TNK_Type_template || 1644 TemplateId->Kind == TNK_Dependent_template_name) { 1645 AnnotateTemplateIdTokenAsType(&SS); 1646 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1647 TemplateTypeTy = Tok.getAnnotationValue(); 1648 } 1649 } 1650 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1651 Diag(Tok, diag::err_expected_member_or_base_name); 1652 return true; 1653 } 1654 1655 // Get the identifier. This may be a member name or a class name, 1656 // but we'll let the semantic analysis determine which it is. 1657 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1658 SourceLocation IdLoc = ConsumeToken(); 1659 1660 // Parse the '('. 1661 if (Tok.isNot(tok::l_paren)) { 1662 Diag(Tok, diag::err_expected_lparen); 1663 return true; 1664 } 1665 SourceLocation LParenLoc = ConsumeParen(); 1666 1667 // Parse the optional expression-list. 1668 ExprVector ArgExprs(Actions); 1669 CommaLocsTy CommaLocs; 1670 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1671 SkipUntil(tok::r_paren); 1672 return true; 1673 } 1674 1675 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1676 1677 return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II, 1678 TemplateTypeTy, IdLoc, 1679 LParenLoc, ArgExprs.take(), 1680 ArgExprs.size(), CommaLocs.data(), 1681 RParenLoc); 1682} 1683 1684/// ParseExceptionSpecification - Parse a C++ exception-specification 1685/// (C++ [except.spec]). 1686/// 1687/// exception-specification: 1688/// 'throw' '(' type-id-list [opt] ')' 1689/// [MS] 'throw' '(' '...' ')' 1690/// 1691/// type-id-list: 1692/// type-id 1693/// type-id-list ',' type-id 1694/// 1695bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 1696 llvm::SmallVector<TypeTy*, 2> 1697 &Exceptions, 1698 llvm::SmallVector<SourceRange, 2> 1699 &Ranges, 1700 bool &hasAnyExceptionSpec) { 1701 assert(Tok.is(tok::kw_throw) && "expected throw"); 1702 1703 SourceLocation ThrowLoc = ConsumeToken(); 1704 1705 if (!Tok.is(tok::l_paren)) { 1706 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 1707 } 1708 SourceLocation LParenLoc = ConsumeParen(); 1709 1710 // Parse throw(...), a Microsoft extension that means "this function 1711 // can throw anything". 1712 if (Tok.is(tok::ellipsis)) { 1713 hasAnyExceptionSpec = true; 1714 SourceLocation EllipsisLoc = ConsumeToken(); 1715 if (!getLang().Microsoft) 1716 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 1717 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1718 return false; 1719 } 1720 1721 // Parse the sequence of type-ids. 1722 SourceRange Range; 1723 while (Tok.isNot(tok::r_paren)) { 1724 TypeResult Res(ParseTypeName(&Range)); 1725 if (!Res.isInvalid()) { 1726 Exceptions.push_back(Res.get()); 1727 Ranges.push_back(Range); 1728 } 1729 if (Tok.is(tok::comma)) 1730 ConsumeToken(); 1731 else 1732 break; 1733 } 1734 1735 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1736 return false; 1737} 1738 1739/// \brief We have just started parsing the definition of a new class, 1740/// so push that class onto our stack of classes that is currently 1741/// being parsed. 1742void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) { 1743 assert((NonNestedClass || !ClassStack.empty()) && 1744 "Nested class without outer class"); 1745 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 1746} 1747 1748/// \brief Deallocate the given parsed class and all of its nested 1749/// classes. 1750void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 1751 for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I) 1752 DeallocateParsedClasses(Class->NestedClasses[I]); 1753 delete Class; 1754} 1755 1756/// \brief Pop the top class of the stack of classes that are 1757/// currently being parsed. 1758/// 1759/// This routine should be called when we have finished parsing the 1760/// definition of a class, but have not yet popped the Scope 1761/// associated with the class's definition. 1762/// 1763/// \returns true if the class we've popped is a top-level class, 1764/// false otherwise. 1765void Parser::PopParsingClass() { 1766 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 1767 1768 ParsingClass *Victim = ClassStack.top(); 1769 ClassStack.pop(); 1770 if (Victim->TopLevelClass) { 1771 // Deallocate all of the nested classes of this class, 1772 // recursively: we don't need to keep any of this information. 1773 DeallocateParsedClasses(Victim); 1774 return; 1775 } 1776 assert(!ClassStack.empty() && "Missing top-level class?"); 1777 1778 if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() && 1779 Victim->NestedClasses.empty()) { 1780 // The victim is a nested class, but we will not need to perform 1781 // any processing after the definition of this class since it has 1782 // no members whose handling was delayed. Therefore, we can just 1783 // remove this nested class. 1784 delete Victim; 1785 return; 1786 } 1787 1788 // This nested class has some members that will need to be processed 1789 // after the top-level class is completely defined. Therefore, add 1790 // it to the list of nested classes within its parent. 1791 assert(CurScope->isClassScope() && "Nested class outside of class scope?"); 1792 ClassStack.top()->NestedClasses.push_back(Victim); 1793 Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope(); 1794} 1795 1796/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 1797/// parses standard attributes. 1798/// 1799/// [C++0x] attribute-specifier: 1800/// '[' '[' attribute-list ']' ']' 1801/// 1802/// [C++0x] attribute-list: 1803/// attribute[opt] 1804/// attribute-list ',' attribute[opt] 1805/// 1806/// [C++0x] attribute: 1807/// attribute-token attribute-argument-clause[opt] 1808/// 1809/// [C++0x] attribute-token: 1810/// identifier 1811/// attribute-scoped-token 1812/// 1813/// [C++0x] attribute-scoped-token: 1814/// attribute-namespace '::' identifier 1815/// 1816/// [C++0x] attribute-namespace: 1817/// identifier 1818/// 1819/// [C++0x] attribute-argument-clause: 1820/// '(' balanced-token-seq ')' 1821/// 1822/// [C++0x] balanced-token-seq: 1823/// balanced-token 1824/// balanced-token-seq balanced-token 1825/// 1826/// [C++0x] balanced-token: 1827/// '(' balanced-token-seq ')' 1828/// '[' balanced-token-seq ']' 1829/// '{' balanced-token-seq '}' 1830/// any token but '(', ')', '[', ']', '{', or '}' 1831CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) { 1832 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 1833 && "Not a C++0x attribute list"); 1834 1835 SourceLocation StartLoc = Tok.getLocation(), Loc; 1836 AttributeList *CurrAttr = 0; 1837 1838 ConsumeBracket(); 1839 ConsumeBracket(); 1840 1841 if (Tok.is(tok::comma)) { 1842 Diag(Tok.getLocation(), diag::err_expected_ident); 1843 ConsumeToken(); 1844 } 1845 1846 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 1847 // attribute not present 1848 if (Tok.is(tok::comma)) { 1849 ConsumeToken(); 1850 continue; 1851 } 1852 1853 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 1854 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 1855 1856 // scoped attribute 1857 if (Tok.is(tok::coloncolon)) { 1858 ConsumeToken(); 1859 1860 if (!Tok.is(tok::identifier)) { 1861 Diag(Tok.getLocation(), diag::err_expected_ident); 1862 SkipUntil(tok::r_square, tok::comma, true, true); 1863 continue; 1864 } 1865 1866 ScopeName = AttrName; 1867 ScopeLoc = AttrLoc; 1868 1869 AttrName = Tok.getIdentifierInfo(); 1870 AttrLoc = ConsumeToken(); 1871 } 1872 1873 bool AttrParsed = false; 1874 // No scoped names are supported; ideally we could put all non-standard 1875 // attributes into namespaces. 1876 if (!ScopeName) { 1877 switch(AttributeList::getKind(AttrName)) 1878 { 1879 // No arguments 1880 case AttributeList::AT_base_check: 1881 case AttributeList::AT_carries_dependency: 1882 case AttributeList::AT_final: 1883 case AttributeList::AT_hiding: 1884 case AttributeList::AT_noreturn: 1885 case AttributeList::AT_override: { 1886 if (Tok.is(tok::l_paren)) { 1887 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 1888 << AttrName->getName(); 1889 break; 1890 } 1891 1892 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0, 1893 SourceLocation(), 0, 0, CurrAttr, false, 1894 true); 1895 AttrParsed = true; 1896 break; 1897 } 1898 1899 // One argument; must be a type-id or assignment-expression 1900 case AttributeList::AT_aligned: { 1901 if (Tok.isNot(tok::l_paren)) { 1902 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 1903 << AttrName->getName(); 1904 break; 1905 } 1906 SourceLocation ParamLoc = ConsumeParen(); 1907 1908 OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 1909 1910 MatchRHSPunctuation(tok::r_paren, ParamLoc); 1911 1912 ExprVector ArgExprs(Actions); 1913 ArgExprs.push_back(ArgExpr.release()); 1914 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 1915 0, ParamLoc, ArgExprs.take(), 1, CurrAttr, 1916 false, true); 1917 1918 AttrParsed = true; 1919 break; 1920 } 1921 1922 // Silence warnings 1923 default: break; 1924 } 1925 } 1926 1927 // Skip the entire parameter clause, if any 1928 if (!AttrParsed && Tok.is(tok::l_paren)) { 1929 ConsumeParen(); 1930 // SkipUntil maintains the balancedness of tokens. 1931 SkipUntil(tok::r_paren, false); 1932 } 1933 } 1934 1935 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1936 SkipUntil(tok::r_square, false); 1937 Loc = Tok.getLocation(); 1938 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1939 SkipUntil(tok::r_square, false); 1940 1941 CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true); 1942 return Attr; 1943} 1944 1945/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 1946/// attribute. 1947/// 1948/// FIXME: Simply returns an alignof() expression if the argument is a 1949/// type. Ideally, the type should be propagated directly into Sema. 1950/// 1951/// [C++0x] 'align' '(' type-id ')' 1952/// [C++0x] 'align' '(' assignment-expression ')' 1953Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 1954 if (isTypeIdInParens()) { 1955 EnterExpressionEvaluationContext Unevaluated(Actions, 1956 Action::Unevaluated); 1957 SourceLocation TypeLoc = Tok.getLocation(); 1958 TypeTy *Ty = ParseTypeName().get(); 1959 SourceRange TypeRange(Start, Tok.getLocation()); 1960 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty, 1961 TypeRange); 1962 } else 1963 return ParseConstantExpression(); 1964} 1965