ParseDeclCXX.cpp revision c9f351700721150a985f21844fbfec55b04e861d
1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the C++ Declaration portions of the Parser interfaces. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Basic/OperatorKinds.h" 15#include "clang/Parse/Parser.h" 16#include "clang/Parse/ParseDiagnostic.h" 17#include "clang/Sema/DeclSpec.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ParsedTemplate.h" 20#include "clang/Sema/PrettyDeclStackTrace.h" 21#include "llvm/ADT/SmallString.h" 22#include "RAIIObjectsForParser.h" 23using namespace clang; 24 25/// ParseNamespace - We know that the current token is a namespace keyword. This 26/// may either be a top level namespace or a block-level namespace alias. If 27/// there was an inline keyword, it has already been parsed. 28/// 29/// namespace-definition: [C++ 7.3: basic.namespace] 30/// named-namespace-definition 31/// unnamed-namespace-definition 32/// 33/// unnamed-namespace-definition: 34/// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' 35/// 36/// named-namespace-definition: 37/// original-namespace-definition 38/// extension-namespace-definition 39/// 40/// original-namespace-definition: 41/// 'inline'[opt] 'namespace' identifier attributes[opt] 42/// '{' namespace-body '}' 43/// 44/// extension-namespace-definition: 45/// 'inline'[opt] 'namespace' original-namespace-name 46/// '{' namespace-body '}' 47/// 48/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 49/// 'namespace' identifier '=' qualified-namespace-specifier ';' 50/// 51Decl *Parser::ParseNamespace(unsigned Context, 52 SourceLocation &DeclEnd, 53 SourceLocation InlineLoc) { 54 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 55 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 56 ObjCDeclContextSwitch ObjCDC(*this); 57 58 if (Tok.is(tok::code_completion)) { 59 Actions.CodeCompleteNamespaceDecl(getCurScope()); 60 cutOffParsing(); 61 return 0; 62 } 63 64 SourceLocation IdentLoc; 65 IdentifierInfo *Ident = 0; 66 std::vector<SourceLocation> ExtraIdentLoc; 67 std::vector<IdentifierInfo*> ExtraIdent; 68 std::vector<SourceLocation> ExtraNamespaceLoc; 69 70 Token attrTok; 71 72 if (Tok.is(tok::identifier)) { 73 Ident = Tok.getIdentifierInfo(); 74 IdentLoc = ConsumeToken(); // eat the identifier. 75 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { 76 ExtraNamespaceLoc.push_back(ConsumeToken()); 77 ExtraIdent.push_back(Tok.getIdentifierInfo()); 78 ExtraIdentLoc.push_back(ConsumeToken()); 79 } 80 } 81 82 // Read label attributes, if present. 83 ParsedAttributes attrs(AttrFactory); 84 if (Tok.is(tok::kw___attribute)) { 85 attrTok = Tok; 86 ParseGNUAttributes(attrs); 87 } 88 89 if (Tok.is(tok::equal)) { 90 if (!attrs.empty()) 91 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 92 if (InlineLoc.isValid()) 93 Diag(InlineLoc, diag::err_inline_namespace_alias) 94 << FixItHint::CreateRemoval(InlineLoc); 95 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 96 } 97 98 99 BalancedDelimiterTracker T(*this, tok::l_brace); 100 if (T.consumeOpen()) { 101 if (!ExtraIdent.empty()) { 102 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 103 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 104 } 105 Diag(Tok, Ident ? diag::err_expected_lbrace : 106 diag::err_expected_ident_lbrace); 107 return 0; 108 } 109 110 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 111 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 112 getCurScope()->getFnParent()) { 113 if (!ExtraIdent.empty()) { 114 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 115 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 116 } 117 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); 118 SkipUntil(tok::r_brace, false); 119 return 0; 120 } 121 122 if (!ExtraIdent.empty()) { 123 TentativeParsingAction TPA(*this); 124 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 125 Token rBraceToken = Tok; 126 TPA.Revert(); 127 128 if (!rBraceToken.is(tok::r_brace)) { 129 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 130 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 131 } else { 132 std::string NamespaceFix; 133 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 134 E = ExtraIdent.end(); I != E; ++I) { 135 NamespaceFix += " { namespace "; 136 NamespaceFix += (*I)->getName(); 137 } 138 139 std::string RBraces; 140 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 141 RBraces += "} "; 142 143 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 144 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 145 ExtraIdentLoc.back()), 146 NamespaceFix) 147 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 148 } 149 } 150 151 // If we're still good, complain about inline namespaces in non-C++0x now. 152 if (InlineLoc.isValid()) 153 Diag(InlineLoc, getLangOpts().CPlusPlus0x ? 154 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace); 155 156 // Enter a scope for the namespace. 157 ParseScope NamespaceScope(this, Scope::DeclScope); 158 159 Decl *NamespcDecl = 160 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, 161 IdentLoc, Ident, T.getOpenLocation(), 162 attrs.getList()); 163 164 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 165 "parsing namespace"); 166 167 // Parse the contents of the namespace. This includes parsing recovery on 168 // any improperly nested namespaces. 169 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 170 InlineLoc, attrs, T); 171 172 // Leave the namespace scope. 173 NamespaceScope.Exit(); 174 175 DeclEnd = T.getCloseLocation(); 176 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); 177 178 return NamespcDecl; 179} 180 181/// ParseInnerNamespace - Parse the contents of a namespace. 182void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc, 183 std::vector<IdentifierInfo*>& Ident, 184 std::vector<SourceLocation>& NamespaceLoc, 185 unsigned int index, SourceLocation& InlineLoc, 186 ParsedAttributes& attrs, 187 BalancedDelimiterTracker &Tracker) { 188 if (index == Ident.size()) { 189 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 190 ParsedAttributesWithRange attrs(AttrFactory); 191 MaybeParseCXX0XAttributes(attrs); 192 MaybeParseMicrosoftAttributes(attrs); 193 ParseExternalDeclaration(attrs); 194 } 195 196 // The caller is what called check -- we are simply calling 197 // the close for it. 198 Tracker.consumeClose(); 199 200 return; 201 } 202 203 // Parse improperly nested namespaces. 204 ParseScope NamespaceScope(this, Scope::DeclScope); 205 Decl *NamespcDecl = 206 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 207 NamespaceLoc[index], IdentLoc[index], 208 Ident[index], Tracker.getOpenLocation(), 209 attrs.getList()); 210 211 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 212 attrs, Tracker); 213 214 NamespaceScope.Exit(); 215 216 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); 217} 218 219/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 220/// alias definition. 221/// 222Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 223 SourceLocation AliasLoc, 224 IdentifierInfo *Alias, 225 SourceLocation &DeclEnd) { 226 assert(Tok.is(tok::equal) && "Not equal token"); 227 228 ConsumeToken(); // eat the '='. 229 230 if (Tok.is(tok::code_completion)) { 231 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 232 cutOffParsing(); 233 return 0; 234 } 235 236 CXXScopeSpec SS; 237 // Parse (optional) nested-name-specifier. 238 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 239 240 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 241 Diag(Tok, diag::err_expected_namespace_name); 242 // Skip to end of the definition and eat the ';'. 243 SkipUntil(tok::semi); 244 return 0; 245 } 246 247 // Parse identifier. 248 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 249 SourceLocation IdentLoc = ConsumeToken(); 250 251 // Eat the ';'. 252 DeclEnd = Tok.getLocation(); 253 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 254 "", tok::semi); 255 256 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 257 SS, IdentLoc, Ident); 258} 259 260/// ParseLinkage - We know that the current token is a string_literal 261/// and just before that, that extern was seen. 262/// 263/// linkage-specification: [C++ 7.5p2: dcl.link] 264/// 'extern' string-literal '{' declaration-seq[opt] '}' 265/// 'extern' string-literal declaration 266/// 267Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 268 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 269 SmallString<8> LangBuffer; 270 bool Invalid = false; 271 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 272 if (Invalid) 273 return 0; 274 275 // FIXME: This is incorrect: linkage-specifiers are parsed in translation 276 // phase 7, so string-literal concatenation is supposed to occur. 277 // extern "" "C" "" "+" "+" { } is legal. 278 if (Tok.hasUDSuffix()) 279 Diag(Tok, diag::err_invalid_string_udl); 280 SourceLocation Loc = ConsumeStringToken(); 281 282 ParseScope LinkageScope(this, Scope::DeclScope); 283 Decl *LinkageSpec 284 = Actions.ActOnStartLinkageSpecification(getCurScope(), 285 DS.getSourceRange().getBegin(), 286 Loc, Lang, 287 Tok.is(tok::l_brace) ? Tok.getLocation() 288 : SourceLocation()); 289 290 ParsedAttributesWithRange attrs(AttrFactory); 291 MaybeParseCXX0XAttributes(attrs); 292 MaybeParseMicrosoftAttributes(attrs); 293 294 if (Tok.isNot(tok::l_brace)) { 295 // Reset the source range in DS, as the leading "extern" 296 // does not really belong to the inner declaration ... 297 DS.SetRangeStart(SourceLocation()); 298 DS.SetRangeEnd(SourceLocation()); 299 // ... but anyway remember that such an "extern" was seen. 300 DS.setExternInLinkageSpec(true); 301 ParseExternalDeclaration(attrs, &DS); 302 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 303 SourceLocation()); 304 } 305 306 DS.abort(); 307 308 ProhibitAttributes(attrs); 309 310 BalancedDelimiterTracker T(*this, tok::l_brace); 311 T.consumeOpen(); 312 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 313 ParsedAttributesWithRange attrs(AttrFactory); 314 MaybeParseCXX0XAttributes(attrs); 315 MaybeParseMicrosoftAttributes(attrs); 316 ParseExternalDeclaration(attrs); 317 } 318 319 T.consumeClose(); 320 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 321 T.getCloseLocation()); 322} 323 324/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 325/// using-directive. Assumes that current token is 'using'. 326Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 327 const ParsedTemplateInfo &TemplateInfo, 328 SourceLocation &DeclEnd, 329 ParsedAttributesWithRange &attrs, 330 Decl **OwnedType) { 331 assert(Tok.is(tok::kw_using) && "Not using token"); 332 ObjCDeclContextSwitch ObjCDC(*this); 333 334 // Eat 'using'. 335 SourceLocation UsingLoc = ConsumeToken(); 336 337 if (Tok.is(tok::code_completion)) { 338 Actions.CodeCompleteUsing(getCurScope()); 339 cutOffParsing(); 340 return 0; 341 } 342 343 // 'using namespace' means this is a using-directive. 344 if (Tok.is(tok::kw_namespace)) { 345 // Template parameters are always an error here. 346 if (TemplateInfo.Kind) { 347 SourceRange R = TemplateInfo.getSourceRange(); 348 Diag(UsingLoc, diag::err_templated_using_directive) 349 << R << FixItHint::CreateRemoval(R); 350 } 351 352 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 353 } 354 355 // Otherwise, it must be a using-declaration or an alias-declaration. 356 357 // Using declarations can't have attributes. 358 ProhibitAttributes(attrs); 359 360 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 361 AS_none, OwnedType); 362} 363 364/// ParseUsingDirective - Parse C++ using-directive, assumes 365/// that current token is 'namespace' and 'using' was already parsed. 366/// 367/// using-directive: [C++ 7.3.p4: namespace.udir] 368/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 369/// namespace-name ; 370/// [GNU] using-directive: 371/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 372/// namespace-name attributes[opt] ; 373/// 374Decl *Parser::ParseUsingDirective(unsigned Context, 375 SourceLocation UsingLoc, 376 SourceLocation &DeclEnd, 377 ParsedAttributes &attrs) { 378 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 379 380 // Eat 'namespace'. 381 SourceLocation NamespcLoc = ConsumeToken(); 382 383 if (Tok.is(tok::code_completion)) { 384 Actions.CodeCompleteUsingDirective(getCurScope()); 385 cutOffParsing(); 386 return 0; 387 } 388 389 CXXScopeSpec SS; 390 // Parse (optional) nested-name-specifier. 391 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 392 393 IdentifierInfo *NamespcName = 0; 394 SourceLocation IdentLoc = SourceLocation(); 395 396 // Parse namespace-name. 397 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 398 Diag(Tok, diag::err_expected_namespace_name); 399 // If there was invalid namespace name, skip to end of decl, and eat ';'. 400 SkipUntil(tok::semi); 401 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 402 return 0; 403 } 404 405 // Parse identifier. 406 NamespcName = Tok.getIdentifierInfo(); 407 IdentLoc = ConsumeToken(); 408 409 // Parse (optional) attributes (most likely GNU strong-using extension). 410 bool GNUAttr = false; 411 if (Tok.is(tok::kw___attribute)) { 412 GNUAttr = true; 413 ParseGNUAttributes(attrs); 414 } 415 416 // Eat ';'. 417 DeclEnd = Tok.getLocation(); 418 ExpectAndConsume(tok::semi, 419 GNUAttr ? diag::err_expected_semi_after_attribute_list 420 : diag::err_expected_semi_after_namespace_name, 421 "", tok::semi); 422 423 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 424 IdentLoc, NamespcName, attrs.getList()); 425} 426 427/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 428/// Assumes that 'using' was already seen. 429/// 430/// using-declaration: [C++ 7.3.p3: namespace.udecl] 431/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 432/// unqualified-id 433/// 'using' :: unqualified-id 434/// 435/// alias-declaration: C++0x [decl.typedef]p2 436/// 'using' identifier = type-id ; 437/// 438Decl *Parser::ParseUsingDeclaration(unsigned Context, 439 const ParsedTemplateInfo &TemplateInfo, 440 SourceLocation UsingLoc, 441 SourceLocation &DeclEnd, 442 AccessSpecifier AS, 443 Decl **OwnedType) { 444 CXXScopeSpec SS; 445 SourceLocation TypenameLoc; 446 bool IsTypeName; 447 ParsedAttributesWithRange attrs(AttrFactory); 448 449 // FIXME: Simply skip the attributes and diagnose, don't bother parsing them. 450 MaybeParseCXX0XAttributes(attrs); 451 ProhibitAttributes(attrs); 452 attrs.clear(); 453 attrs.Range = SourceRange(); 454 455 // Ignore optional 'typename'. 456 // FIXME: This is wrong; we should parse this as a typename-specifier. 457 if (Tok.is(tok::kw_typename)) { 458 TypenameLoc = Tok.getLocation(); 459 ConsumeToken(); 460 IsTypeName = true; 461 } 462 else 463 IsTypeName = false; 464 465 // Parse nested-name-specifier. 466 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 467 468 // Check nested-name specifier. 469 if (SS.isInvalid()) { 470 SkipUntil(tok::semi); 471 return 0; 472 } 473 474 // Parse the unqualified-id. We allow parsing of both constructor and 475 // destructor names and allow the action module to diagnose any semantic 476 // errors. 477 SourceLocation TemplateKWLoc; 478 UnqualifiedId Name; 479 if (ParseUnqualifiedId(SS, 480 /*EnteringContext=*/false, 481 /*AllowDestructorName=*/true, 482 /*AllowConstructorName=*/true, 483 ParsedType(), 484 TemplateKWLoc, 485 Name)) { 486 SkipUntil(tok::semi); 487 return 0; 488 } 489 490 MaybeParseCXX0XAttributes(attrs); 491 492 // Maybe this is an alias-declaration. 493 bool IsAliasDecl = Tok.is(tok::equal); 494 TypeResult TypeAlias; 495 if (IsAliasDecl) { 496 // TODO: Attribute support. C++0x attributes may appear before the equals. 497 // Where can GNU attributes appear? 498 ConsumeToken(); 499 500 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ? 501 diag::warn_cxx98_compat_alias_declaration : 502 diag::ext_alias_declaration); 503 504 // Type alias templates cannot be specialized. 505 int SpecKind = -1; 506 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 507 Name.getKind() == UnqualifiedId::IK_TemplateId) 508 SpecKind = 0; 509 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 510 SpecKind = 1; 511 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 512 SpecKind = 2; 513 if (SpecKind != -1) { 514 SourceRange Range; 515 if (SpecKind == 0) 516 Range = SourceRange(Name.TemplateId->LAngleLoc, 517 Name.TemplateId->RAngleLoc); 518 else 519 Range = TemplateInfo.getSourceRange(); 520 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 521 << SpecKind << Range; 522 SkipUntil(tok::semi); 523 return 0; 524 } 525 526 // Name must be an identifier. 527 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 528 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 529 // No removal fixit: can't recover from this. 530 SkipUntil(tok::semi); 531 return 0; 532 } else if (IsTypeName) 533 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 534 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 535 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 536 else if (SS.isNotEmpty()) 537 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 538 << FixItHint::CreateRemoval(SS.getRange()); 539 540 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 541 Declarator::AliasTemplateContext : 542 Declarator::AliasDeclContext, AS, OwnedType); 543 } else { 544 // C++11 attributes are not allowed on a using-declaration, but GNU ones 545 // are. 546 ProhibitAttributes(attrs); 547 548 // Parse (optional) attributes (most likely GNU strong-using extension). 549 MaybeParseGNUAttributes(attrs); 550 } 551 552 // Eat ';'. 553 DeclEnd = Tok.getLocation(); 554 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 555 !attrs.empty() ? "attributes list" : 556 IsAliasDecl ? "alias declaration" : "using declaration", 557 tok::semi); 558 559 // Diagnose an attempt to declare a templated using-declaration. 560 // In C++0x, alias-declarations can be templates: 561 // template <...> using id = type; 562 if (TemplateInfo.Kind && !IsAliasDecl) { 563 SourceRange R = TemplateInfo.getSourceRange(); 564 Diag(UsingLoc, diag::err_templated_using_declaration) 565 << R << FixItHint::CreateRemoval(R); 566 567 // Unfortunately, we have to bail out instead of recovering by 568 // ignoring the parameters, just in case the nested name specifier 569 // depends on the parameters. 570 return 0; 571 } 572 573 // "typename" keyword is allowed for identifiers only, 574 // because it may be a type definition. 575 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) { 576 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) 577 << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); 578 // Proceed parsing, but reset the IsTypeName flag. 579 IsTypeName = false; 580 } 581 582 if (IsAliasDecl) { 583 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 584 MultiTemplateParamsArg TemplateParamsArg(Actions, 585 TemplateParams ? TemplateParams->data() : 0, 586 TemplateParams ? TemplateParams->size() : 0); 587 // FIXME: Propagate attributes. 588 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 589 UsingLoc, Name, TypeAlias); 590 } 591 592 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 593 Name, attrs.getList(), 594 IsTypeName, TypenameLoc); 595} 596 597/// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration. 598/// 599/// [C++0x] static_assert-declaration: 600/// static_assert ( constant-expression , string-literal ) ; 601/// 602/// [C11] static_assert-declaration: 603/// _Static_assert ( constant-expression , string-literal ) ; 604/// 605Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 606 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 607 "Not a static_assert declaration"); 608 609 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11) 610 Diag(Tok, diag::ext_c11_static_assert); 611 if (Tok.is(tok::kw_static_assert)) 612 Diag(Tok, diag::warn_cxx98_compat_static_assert); 613 614 SourceLocation StaticAssertLoc = ConsumeToken(); 615 616 BalancedDelimiterTracker T(*this, tok::l_paren); 617 if (T.consumeOpen()) { 618 Diag(Tok, diag::err_expected_lparen); 619 return 0; 620 } 621 622 ExprResult AssertExpr(ParseConstantExpression()); 623 if (AssertExpr.isInvalid()) { 624 SkipUntil(tok::semi); 625 return 0; 626 } 627 628 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 629 return 0; 630 631 if (!isTokenStringLiteral()) { 632 Diag(Tok, diag::err_expected_string_literal); 633 SkipUntil(tok::semi); 634 return 0; 635 } 636 637 ExprResult AssertMessage(ParseStringLiteralExpression()); 638 if (AssertMessage.isInvalid()) { 639 SkipUntil(tok::semi); 640 return 0; 641 } 642 643 T.consumeClose(); 644 645 DeclEnd = Tok.getLocation(); 646 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 647 648 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 649 AssertExpr.take(), 650 AssertMessage.take(), 651 T.getCloseLocation()); 652} 653 654/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 655/// 656/// 'decltype' ( expression ) 657/// 658SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 659 assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) 660 && "Not a decltype specifier"); 661 662 663 ExprResult Result; 664 SourceLocation StartLoc = Tok.getLocation(); 665 SourceLocation EndLoc; 666 667 if (Tok.is(tok::annot_decltype)) { 668 Result = getExprAnnotation(Tok); 669 EndLoc = Tok.getAnnotationEndLoc(); 670 ConsumeToken(); 671 if (Result.isInvalid()) { 672 DS.SetTypeSpecError(); 673 return EndLoc; 674 } 675 } else { 676 if (Tok.getIdentifierInfo()->isStr("decltype")) 677 Diag(Tok, diag::warn_cxx98_compat_decltype); 678 679 ConsumeToken(); 680 681 BalancedDelimiterTracker T(*this, tok::l_paren); 682 if (T.expectAndConsume(diag::err_expected_lparen_after, 683 "decltype", tok::r_paren)) { 684 DS.SetTypeSpecError(); 685 return T.getOpenLocation() == Tok.getLocation() ? 686 StartLoc : T.getOpenLocation(); 687 } 688 689 // Parse the expression 690 691 // C++0x [dcl.type.simple]p4: 692 // The operand of the decltype specifier is an unevaluated operand. 693 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 694 0, /*IsDecltype=*/true); 695 Result = ParseExpression(); 696 if (Result.isInvalid()) { 697 SkipUntil(tok::r_paren); 698 DS.SetTypeSpecError(); 699 return StartLoc; 700 } 701 702 // Match the ')' 703 T.consumeClose(); 704 if (T.getCloseLocation().isInvalid()) { 705 DS.SetTypeSpecError(); 706 // FIXME: this should return the location of the last token 707 // that was consumed (by "consumeClose()") 708 return T.getCloseLocation(); 709 } 710 711 Result = Actions.ActOnDecltypeExpression(Result.take()); 712 if (Result.isInvalid()) { 713 DS.SetTypeSpecError(); 714 return T.getCloseLocation(); 715 } 716 717 EndLoc = T.getCloseLocation(); 718 } 719 720 const char *PrevSpec = 0; 721 unsigned DiagID; 722 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 723 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 724 DiagID, Result.release())) { 725 Diag(StartLoc, DiagID) << PrevSpec; 726 DS.SetTypeSpecError(); 727 } 728 return EndLoc; 729} 730 731void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS, 732 SourceLocation StartLoc, 733 SourceLocation EndLoc) { 734 // make sure we have a token we can turn into an annotation token 735 if (PP.isBacktrackEnabled()) 736 PP.RevertCachedTokens(1); 737 else 738 PP.EnterToken(Tok); 739 740 Tok.setKind(tok::annot_decltype); 741 setExprAnnotation(Tok, DS.getTypeSpecType() == TST_decltype ? 742 DS.getRepAsExpr() : ExprResult()); 743 Tok.setAnnotationEndLoc(EndLoc); 744 Tok.setLocation(StartLoc); 745 PP.AnnotateCachedTokens(Tok); 746} 747 748void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 749 assert(Tok.is(tok::kw___underlying_type) && 750 "Not an underlying type specifier"); 751 752 SourceLocation StartLoc = ConsumeToken(); 753 BalancedDelimiterTracker T(*this, tok::l_paren); 754 if (T.expectAndConsume(diag::err_expected_lparen_after, 755 "__underlying_type", tok::r_paren)) { 756 return; 757 } 758 759 TypeResult Result = ParseTypeName(); 760 if (Result.isInvalid()) { 761 SkipUntil(tok::r_paren); 762 return; 763 } 764 765 // Match the ')' 766 T.consumeClose(); 767 if (T.getCloseLocation().isInvalid()) 768 return; 769 770 const char *PrevSpec = 0; 771 unsigned DiagID; 772 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 773 DiagID, Result.release())) 774 Diag(StartLoc, DiagID) << PrevSpec; 775} 776 777/// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a 778/// class name or decltype-specifier. Note that we only check that the result 779/// names a type; semantic analysis will need to verify that the type names a 780/// class. The result is either a type or null, depending on whether a type 781/// name was found. 782/// 783/// base-type-specifier: [C++ 10.1] 784/// class-or-decltype 785/// class-or-decltype: [C++ 10.1] 786/// nested-name-specifier[opt] class-name 787/// decltype-specifier 788/// class-name: [C++ 9.1] 789/// identifier 790/// simple-template-id 791/// 792Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc, 793 SourceLocation &EndLocation) { 794 // Ignore attempts to use typename 795 if (Tok.is(tok::kw_typename)) { 796 Diag(Tok, diag::err_expected_class_name_not_template) 797 << FixItHint::CreateRemoval(Tok.getLocation()); 798 ConsumeToken(); 799 } 800 801 // Parse optional nested-name-specifier 802 CXXScopeSpec SS; 803 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 804 805 BaseLoc = Tok.getLocation(); 806 807 // Parse decltype-specifier 808 // tok == kw_decltype is just error recovery, it can only happen when SS 809 // isn't empty 810 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) { 811 if (SS.isNotEmpty()) 812 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype) 813 << FixItHint::CreateRemoval(SS.getRange()); 814 // Fake up a Declarator to use with ActOnTypeName. 815 DeclSpec DS(AttrFactory); 816 817 EndLocation = ParseDecltypeSpecifier(DS); 818 819 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 820 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 821 } 822 823 // Check whether we have a template-id that names a type. 824 if (Tok.is(tok::annot_template_id)) { 825 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 826 if (TemplateId->Kind == TNK_Type_template || 827 TemplateId->Kind == TNK_Dependent_template_name) { 828 AnnotateTemplateIdTokenAsType(); 829 830 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 831 ParsedType Type = getTypeAnnotation(Tok); 832 EndLocation = Tok.getAnnotationEndLoc(); 833 ConsumeToken(); 834 835 if (Type) 836 return Type; 837 return true; 838 } 839 840 // Fall through to produce an error below. 841 } 842 843 if (Tok.isNot(tok::identifier)) { 844 Diag(Tok, diag::err_expected_class_name); 845 return true; 846 } 847 848 IdentifierInfo *Id = Tok.getIdentifierInfo(); 849 SourceLocation IdLoc = ConsumeToken(); 850 851 if (Tok.is(tok::less)) { 852 // It looks the user intended to write a template-id here, but the 853 // template-name was wrong. Try to fix that. 854 TemplateNameKind TNK = TNK_Type_template; 855 TemplateTy Template; 856 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 857 &SS, Template, TNK)) { 858 Diag(IdLoc, diag::err_unknown_template_name) 859 << Id; 860 } 861 862 if (!Template) 863 return true; 864 865 // Form the template name 866 UnqualifiedId TemplateName; 867 TemplateName.setIdentifier(Id, IdLoc); 868 869 // Parse the full template-id, then turn it into a type. 870 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(), 871 TemplateName, true)) 872 return true; 873 if (TNK == TNK_Dependent_template_name) 874 AnnotateTemplateIdTokenAsType(); 875 876 // If we didn't end up with a typename token, there's nothing more we 877 // can do. 878 if (Tok.isNot(tok::annot_typename)) 879 return true; 880 881 // Retrieve the type from the annotation token, consume that token, and 882 // return. 883 EndLocation = Tok.getAnnotationEndLoc(); 884 ParsedType Type = getTypeAnnotation(Tok); 885 ConsumeToken(); 886 return Type; 887 } 888 889 // We have an identifier; check whether it is actually a type. 890 IdentifierInfo *CorrectedII = 0; 891 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 892 false, ParsedType(), 893 /*IsCtorOrDtorName=*/false, 894 /*NonTrivialTypeSourceInfo=*/true, 895 &CorrectedII); 896 if (!Type) { 897 Diag(IdLoc, diag::err_expected_class_name); 898 return true; 899 } 900 901 // Consume the identifier. 902 EndLocation = IdLoc; 903 904 // Fake up a Declarator to use with ActOnTypeName. 905 DeclSpec DS(AttrFactory); 906 DS.SetRangeStart(IdLoc); 907 DS.SetRangeEnd(EndLocation); 908 DS.getTypeSpecScope() = SS; 909 910 const char *PrevSpec = 0; 911 unsigned DiagID; 912 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 913 914 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 915 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 916} 917 918void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) { 919 while (Tok.is(tok::kw___single_inheritance) || 920 Tok.is(tok::kw___multiple_inheritance) || 921 Tok.is(tok::kw___virtual_inheritance)) { 922 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 923 SourceLocation AttrNameLoc = ConsumeToken(); 924 attrs.addNew(AttrName, AttrNameLoc, 0, AttrNameLoc, 0, 925 SourceLocation(), 0, 0, AttributeList::AS_GNU); 926 } 927} 928 929/// Determine whether the following tokens are valid after a type-specifier 930/// which could be a standalone declaration. This will conservatively return 931/// true if there's any doubt, and is appropriate for insert-';' fixits. 932bool Parser::isValidAfterTypeSpecifier() { 933 // This switch enumerates the valid "follow" set for type-specifiers. 934 switch (Tok.getKind()) { 935 default: break; 936 case tok::semi: // struct foo {...} ; 937 case tok::star: // struct foo {...} * P; 938 case tok::amp: // struct foo {...} & R = ... 939 case tok::identifier: // struct foo {...} V ; 940 case tok::r_paren: //(struct foo {...} ) {4} 941 case tok::annot_cxxscope: // struct foo {...} a:: b; 942 case tok::annot_typename: // struct foo {...} a ::b; 943 case tok::annot_template_id: // struct foo {...} a<int> ::b; 944 case tok::l_paren: // struct foo {...} ( x); 945 case tok::comma: // __builtin_offsetof(struct foo{...} , 946 return true; 947 // Type qualifiers 948 case tok::kw_const: // struct foo {...} const x; 949 case tok::kw_volatile: // struct foo {...} volatile x; 950 case tok::kw_restrict: // struct foo {...} restrict x; 951 case tok::kw_inline: // struct foo {...} inline foo() {}; 952 // Storage-class specifiers 953 case tok::kw_static: // struct foo {...} static x; 954 case tok::kw_extern: // struct foo {...} extern x; 955 case tok::kw_typedef: // struct foo {...} typedef x; 956 case tok::kw_register: // struct foo {...} register x; 957 case tok::kw_auto: // struct foo {...} auto x; 958 case tok::kw_mutable: // struct foo {...} mutable x; 959 case tok::kw_constexpr: // struct foo {...} constexpr x; 960 // As shown above, type qualifiers and storage class specifiers absolutely 961 // can occur after class specifiers according to the grammar. However, 962 // almost no one actually writes code like this. If we see one of these, 963 // it is much more likely that someone missed a semi colon and the 964 // type/storage class specifier we're seeing is part of the *next* 965 // intended declaration, as in: 966 // 967 // struct foo { ... } 968 // typedef int X; 969 // 970 // We'd really like to emit a missing semicolon error instead of emitting 971 // an error on the 'int' saying that you can't have two type specifiers in 972 // the same declaration of X. Because of this, we look ahead past this 973 // token to see if it's a type specifier. If so, we know the code is 974 // otherwise invalid, so we can produce the expected semi error. 975 if (!isKnownToBeTypeSpecifier(NextToken())) 976 return true; 977 break; 978 case tok::r_brace: // struct bar { struct foo {...} } 979 // Missing ';' at end of struct is accepted as an extension in C mode. 980 if (!getLangOpts().CPlusPlus) 981 return true; 982 break; 983 } 984 return false; 985} 986 987/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 988/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 989/// until we reach the start of a definition or see a token that 990/// cannot start a definition. 991/// 992/// class-specifier: [C++ class] 993/// class-head '{' member-specification[opt] '}' 994/// class-head '{' member-specification[opt] '}' attributes[opt] 995/// class-head: 996/// class-key identifier[opt] base-clause[opt] 997/// class-key nested-name-specifier identifier base-clause[opt] 998/// class-key nested-name-specifier[opt] simple-template-id 999/// base-clause[opt] 1000/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 1001/// [GNU] class-key attributes[opt] nested-name-specifier 1002/// identifier base-clause[opt] 1003/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 1004/// simple-template-id base-clause[opt] 1005/// class-key: 1006/// 'class' 1007/// 'struct' 1008/// 'union' 1009/// 1010/// elaborated-type-specifier: [C++ dcl.type.elab] 1011/// class-key ::[opt] nested-name-specifier[opt] identifier 1012/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 1013/// simple-template-id 1014/// 1015/// Note that the C++ class-specifier and elaborated-type-specifier, 1016/// together, subsume the C99 struct-or-union-specifier: 1017/// 1018/// struct-or-union-specifier: [C99 6.7.2.1] 1019/// struct-or-union identifier[opt] '{' struct-contents '}' 1020/// struct-or-union identifier 1021/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 1022/// '}' attributes[opt] 1023/// [GNU] struct-or-union attributes[opt] identifier 1024/// struct-or-union: 1025/// 'struct' 1026/// 'union' 1027void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 1028 SourceLocation StartLoc, DeclSpec &DS, 1029 const ParsedTemplateInfo &TemplateInfo, 1030 AccessSpecifier AS, 1031 bool EnteringContext, DeclSpecContext DSC) { 1032 DeclSpec::TST TagType; 1033 if (TagTokKind == tok::kw_struct) 1034 TagType = DeclSpec::TST_struct; 1035 else if (TagTokKind == tok::kw_class) 1036 TagType = DeclSpec::TST_class; 1037 else { 1038 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 1039 TagType = DeclSpec::TST_union; 1040 } 1041 1042 if (Tok.is(tok::code_completion)) { 1043 // Code completion for a struct, class, or union name. 1044 Actions.CodeCompleteTag(getCurScope(), TagType); 1045 return cutOffParsing(); 1046 } 1047 1048 // C++03 [temp.explicit] 14.7.2/8: 1049 // The usual access checking rules do not apply to names used to specify 1050 // explicit instantiations. 1051 // 1052 // As an extension we do not perform access checking on the names used to 1053 // specify explicit specializations either. This is important to allow 1054 // specializing traits classes for private types. 1055 // 1056 // Note that we don't suppress if this turns out to be an elaborated 1057 // type specifier. 1058 bool shouldDelayDiagsInTag = 1059 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 1060 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization); 1061 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag); 1062 1063 ParsedAttributesWithRange attrs(AttrFactory); 1064 // If attributes exist after tag, parse them. 1065 if (Tok.is(tok::kw___attribute)) 1066 ParseGNUAttributes(attrs); 1067 1068 // If declspecs exist after tag, parse them. 1069 while (Tok.is(tok::kw___declspec)) 1070 ParseMicrosoftDeclSpec(attrs); 1071 1072 // Parse inheritance specifiers. 1073 if (Tok.is(tok::kw___single_inheritance) || 1074 Tok.is(tok::kw___multiple_inheritance) || 1075 Tok.is(tok::kw___virtual_inheritance)) 1076 ParseMicrosoftInheritanceClassAttributes(attrs); 1077 1078 // If C++0x attributes exist here, parse them. 1079 // FIXME: Are we consistent with the ordering of parsing of different 1080 // styles of attributes? 1081 MaybeParseCXX0XAttributes(attrs); 1082 1083 if (TagType == DeclSpec::TST_struct && 1084 !Tok.is(tok::identifier) && 1085 Tok.getIdentifierInfo() && 1086 (Tok.is(tok::kw___is_arithmetic) || 1087 Tok.is(tok::kw___is_convertible) || 1088 Tok.is(tok::kw___is_empty) || 1089 Tok.is(tok::kw___is_floating_point) || 1090 Tok.is(tok::kw___is_function) || 1091 Tok.is(tok::kw___is_fundamental) || 1092 Tok.is(tok::kw___is_integral) || 1093 Tok.is(tok::kw___is_member_function_pointer) || 1094 Tok.is(tok::kw___is_member_pointer) || 1095 Tok.is(tok::kw___is_pod) || 1096 Tok.is(tok::kw___is_pointer) || 1097 Tok.is(tok::kw___is_same) || 1098 Tok.is(tok::kw___is_scalar) || 1099 Tok.is(tok::kw___is_signed) || 1100 Tok.is(tok::kw___is_unsigned) || 1101 Tok.is(tok::kw___is_void))) { 1102 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 1103 // name of struct templates, but some are keywords in GCC >= 4.3 1104 // and Clang. Therefore, when we see the token sequence "struct 1105 // X", make X into a normal identifier rather than a keyword, to 1106 // allow libstdc++ 4.2 and libc++ to work properly. 1107 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 1108 Tok.setKind(tok::identifier); 1109 } 1110 1111 // Parse the (optional) nested-name-specifier. 1112 CXXScopeSpec &SS = DS.getTypeSpecScope(); 1113 if (getLangOpts().CPlusPlus) { 1114 // "FOO : BAR" is not a potential typo for "FOO::BAR". 1115 ColonProtectionRAIIObject X(*this); 1116 1117 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext)) 1118 DS.SetTypeSpecError(); 1119 if (SS.isSet()) 1120 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 1121 Diag(Tok, diag::err_expected_ident); 1122 } 1123 1124 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 1125 1126 // Parse the (optional) class name or simple-template-id. 1127 IdentifierInfo *Name = 0; 1128 SourceLocation NameLoc; 1129 TemplateIdAnnotation *TemplateId = 0; 1130 if (Tok.is(tok::identifier)) { 1131 Name = Tok.getIdentifierInfo(); 1132 NameLoc = ConsumeToken(); 1133 1134 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) { 1135 // The name was supposed to refer to a template, but didn't. 1136 // Eat the template argument list and try to continue parsing this as 1137 // a class (or template thereof). 1138 TemplateArgList TemplateArgs; 1139 SourceLocation LAngleLoc, RAngleLoc; 1140 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 1141 true, LAngleLoc, 1142 TemplateArgs, RAngleLoc)) { 1143 // We couldn't parse the template argument list at all, so don't 1144 // try to give any location information for the list. 1145 LAngleLoc = RAngleLoc = SourceLocation(); 1146 } 1147 1148 Diag(NameLoc, diag::err_explicit_spec_non_template) 1149 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 1150 << (TagType == DeclSpec::TST_class? 0 1151 : TagType == DeclSpec::TST_struct? 1 1152 : 2) 1153 << Name 1154 << SourceRange(LAngleLoc, RAngleLoc); 1155 1156 // Strip off the last template parameter list if it was empty, since 1157 // we've removed its template argument list. 1158 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 1159 if (TemplateParams && TemplateParams->size() > 1) { 1160 TemplateParams->pop_back(); 1161 } else { 1162 TemplateParams = 0; 1163 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 1164 = ParsedTemplateInfo::NonTemplate; 1165 } 1166 } else if (TemplateInfo.Kind 1167 == ParsedTemplateInfo::ExplicitInstantiation) { 1168 // Pretend this is just a forward declaration. 1169 TemplateParams = 0; 1170 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 1171 = ParsedTemplateInfo::NonTemplate; 1172 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 1173 = SourceLocation(); 1174 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 1175 = SourceLocation(); 1176 } 1177 } 1178 } else if (Tok.is(tok::annot_template_id)) { 1179 TemplateId = takeTemplateIdAnnotation(Tok); 1180 NameLoc = ConsumeToken(); 1181 1182 if (TemplateId->Kind != TNK_Type_template && 1183 TemplateId->Kind != TNK_Dependent_template_name) { 1184 // The template-name in the simple-template-id refers to 1185 // something other than a class template. Give an appropriate 1186 // error message and skip to the ';'. 1187 SourceRange Range(NameLoc); 1188 if (SS.isNotEmpty()) 1189 Range.setBegin(SS.getBeginLoc()); 1190 1191 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 1192 << Name << static_cast<int>(TemplateId->Kind) << Range; 1193 1194 DS.SetTypeSpecError(); 1195 SkipUntil(tok::semi, false, true); 1196 return; 1197 } 1198 } 1199 1200 // There are four options here. 1201 // - If we are in a trailing return type, this is always just a reference, 1202 // and we must not try to parse a definition. For instance, 1203 // [] () -> struct S { }; 1204 // does not define a type. 1205 // - If we have 'struct foo {...', 'struct foo :...', 1206 // 'struct foo final :' or 'struct foo final {', then this is a definition. 1207 // - If we have 'struct foo;', then this is either a forward declaration 1208 // or a friend declaration, which have to be treated differently. 1209 // - Otherwise we have something like 'struct foo xyz', a reference. 1210 // However, in type-specifier-seq's, things look like declarations but are 1211 // just references, e.g. 1212 // new struct s; 1213 // or 1214 // &T::operator struct s; 1215 // For these, DSC is DSC_type_specifier. 1216 Sema::TagUseKind TUK; 1217 if (DSC == DSC_trailing) 1218 TUK = Sema::TUK_Reference; 1219 else if (Tok.is(tok::l_brace) || 1220 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || 1221 (isCXX0XFinalKeyword() && 1222 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) { 1223 if (DS.isFriendSpecified()) { 1224 // C++ [class.friend]p2: 1225 // A class shall not be defined in a friend declaration. 1226 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type) 1227 << SourceRange(DS.getFriendSpecLoc()); 1228 1229 // Skip everything up to the semicolon, so that this looks like a proper 1230 // friend class (or template thereof) declaration. 1231 SkipUntil(tok::semi, true, true); 1232 TUK = Sema::TUK_Friend; 1233 } else { 1234 // Okay, this is a class definition. 1235 TUK = Sema::TUK_Definition; 1236 } 1237 } else if (DSC != DSC_type_specifier && 1238 (Tok.is(tok::semi) || 1239 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier()))) { 1240 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1241 if (Tok.isNot(tok::semi)) { 1242 // A semicolon was missing after this declaration. Diagnose and recover. 1243 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1244 TagType == DeclSpec::TST_class ? "class" : 1245 TagType == DeclSpec::TST_struct ? "struct" : "union"); 1246 PP.EnterToken(Tok); 1247 Tok.setKind(tok::semi); 1248 } 1249 } else 1250 TUK = Sema::TUK_Reference; 1251 1252 // If this is an elaborated type specifier, and we delayed 1253 // diagnostics before, just merge them into the current pool. 1254 if (shouldDelayDiagsInTag) { 1255 diagsFromTag.done(); 1256 if (TUK == Sema::TUK_Reference) 1257 diagsFromTag.redelay(); 1258 } 1259 1260 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1261 TUK != Sema::TUK_Definition)) { 1262 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1263 // We have a declaration or reference to an anonymous class. 1264 Diag(StartLoc, diag::err_anon_type_definition) 1265 << DeclSpec::getSpecifierName(TagType); 1266 } 1267 1268 SkipUntil(tok::comma, true); 1269 return; 1270 } 1271 1272 // Create the tag portion of the class or class template. 1273 DeclResult TagOrTempResult = true; // invalid 1274 TypeResult TypeResult = true; // invalid 1275 1276 bool Owned = false; 1277 if (TemplateId) { 1278 // Explicit specialization, class template partial specialization, 1279 // or explicit instantiation. 1280 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1281 TemplateId->getTemplateArgs(), 1282 TemplateId->NumArgs); 1283 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1284 TUK == Sema::TUK_Declaration) { 1285 // This is an explicit instantiation of a class template. 1286 ProhibitAttributes(attrs); 1287 1288 TagOrTempResult 1289 = Actions.ActOnExplicitInstantiation(getCurScope(), 1290 TemplateInfo.ExternLoc, 1291 TemplateInfo.TemplateLoc, 1292 TagType, 1293 StartLoc, 1294 SS, 1295 TemplateId->Template, 1296 TemplateId->TemplateNameLoc, 1297 TemplateId->LAngleLoc, 1298 TemplateArgsPtr, 1299 TemplateId->RAngleLoc, 1300 attrs.getList()); 1301 1302 // Friend template-ids are treated as references unless 1303 // they have template headers, in which case they're ill-formed 1304 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1305 // We diagnose this error in ActOnClassTemplateSpecialization. 1306 } else if (TUK == Sema::TUK_Reference || 1307 (TUK == Sema::TUK_Friend && 1308 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1309 ProhibitAttributes(attrs); 1310 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc, 1311 TemplateId->SS, 1312 TemplateId->TemplateKWLoc, 1313 TemplateId->Template, 1314 TemplateId->TemplateNameLoc, 1315 TemplateId->LAngleLoc, 1316 TemplateArgsPtr, 1317 TemplateId->RAngleLoc); 1318 } else { 1319 // This is an explicit specialization or a class template 1320 // partial specialization. 1321 TemplateParameterLists FakedParamLists; 1322 1323 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1324 // This looks like an explicit instantiation, because we have 1325 // something like 1326 // 1327 // template class Foo<X> 1328 // 1329 // but it actually has a definition. Most likely, this was 1330 // meant to be an explicit specialization, but the user forgot 1331 // the '<>' after 'template'. 1332 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1333 1334 SourceLocation LAngleLoc 1335 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1336 Diag(TemplateId->TemplateNameLoc, 1337 diag::err_explicit_instantiation_with_definition) 1338 << SourceRange(TemplateInfo.TemplateLoc) 1339 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1340 1341 // Create a fake template parameter list that contains only 1342 // "template<>", so that we treat this construct as a class 1343 // template specialization. 1344 FakedParamLists.push_back( 1345 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1346 TemplateInfo.TemplateLoc, 1347 LAngleLoc, 1348 0, 0, 1349 LAngleLoc)); 1350 TemplateParams = &FakedParamLists; 1351 } 1352 1353 // Build the class template specialization. 1354 TagOrTempResult 1355 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1356 StartLoc, DS.getModulePrivateSpecLoc(), SS, 1357 TemplateId->Template, 1358 TemplateId->TemplateNameLoc, 1359 TemplateId->LAngleLoc, 1360 TemplateArgsPtr, 1361 TemplateId->RAngleLoc, 1362 attrs.getList(), 1363 MultiTemplateParamsArg(Actions, 1364 TemplateParams? &(*TemplateParams)[0] : 0, 1365 TemplateParams? TemplateParams->size() : 0)); 1366 } 1367 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1368 TUK == Sema::TUK_Declaration) { 1369 // Explicit instantiation of a member of a class template 1370 // specialization, e.g., 1371 // 1372 // template struct Outer<int>::Inner; 1373 // 1374 ProhibitAttributes(attrs); 1375 1376 TagOrTempResult 1377 = Actions.ActOnExplicitInstantiation(getCurScope(), 1378 TemplateInfo.ExternLoc, 1379 TemplateInfo.TemplateLoc, 1380 TagType, StartLoc, SS, Name, 1381 NameLoc, attrs.getList()); 1382 } else if (TUK == Sema::TUK_Friend && 1383 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1384 ProhibitAttributes(attrs); 1385 1386 TagOrTempResult = 1387 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1388 TagType, StartLoc, SS, 1389 Name, NameLoc, attrs.getList(), 1390 MultiTemplateParamsArg(Actions, 1391 TemplateParams? &(*TemplateParams)[0] : 0, 1392 TemplateParams? TemplateParams->size() : 0)); 1393 } else { 1394 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1395 TUK == Sema::TUK_Definition) { 1396 // FIXME: Diagnose this particular error. 1397 } 1398 1399 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition) 1400 ProhibitAttributes(attrs); 1401 1402 bool IsDependent = false; 1403 1404 // Don't pass down template parameter lists if this is just a tag 1405 // reference. For example, we don't need the template parameters here: 1406 // template <class T> class A *makeA(T t); 1407 MultiTemplateParamsArg TParams; 1408 if (TUK != Sema::TUK_Reference && TemplateParams) 1409 TParams = 1410 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1411 1412 // Declaration or definition of a class type 1413 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1414 SS, Name, NameLoc, attrs.getList(), AS, 1415 DS.getModulePrivateSpecLoc(), 1416 TParams, Owned, IsDependent, 1417 SourceLocation(), false, 1418 clang::TypeResult()); 1419 1420 // If ActOnTag said the type was dependent, try again with the 1421 // less common call. 1422 if (IsDependent) { 1423 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1424 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1425 SS, Name, StartLoc, NameLoc); 1426 } 1427 } 1428 1429 // If there is a body, parse it and inform the actions module. 1430 if (TUK == Sema::TUK_Definition) { 1431 assert(Tok.is(tok::l_brace) || 1432 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || 1433 isCXX0XFinalKeyword()); 1434 if (getLangOpts().CPlusPlus) 1435 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1436 else 1437 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1438 } 1439 1440 const char *PrevSpec = 0; 1441 unsigned DiagID; 1442 bool Result; 1443 if (!TypeResult.isInvalid()) { 1444 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1445 NameLoc.isValid() ? NameLoc : StartLoc, 1446 PrevSpec, DiagID, TypeResult.get()); 1447 } else if (!TagOrTempResult.isInvalid()) { 1448 Result = DS.SetTypeSpecType(TagType, StartLoc, 1449 NameLoc.isValid() ? NameLoc : StartLoc, 1450 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1451 } else { 1452 DS.SetTypeSpecError(); 1453 return; 1454 } 1455 1456 if (Result) 1457 Diag(StartLoc, DiagID) << PrevSpec; 1458 1459 // At this point, we've successfully parsed a class-specifier in 'definition' 1460 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1461 // going to look at what comes after it to improve error recovery. If an 1462 // impossible token occurs next, we assume that the programmer forgot a ; at 1463 // the end of the declaration and recover that way. 1464 // 1465 // Also enforce C++ [temp]p3: 1466 // In a template-declaration which defines a class, no declarator 1467 // is permitted. 1468 if (TUK == Sema::TUK_Definition && 1469 (TemplateInfo.Kind || !isValidAfterTypeSpecifier())) { 1470 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1471 TagType == DeclSpec::TST_class ? "class" : 1472 TagType == DeclSpec::TST_struct ? "struct" : "union"); 1473 // Push this token back into the preprocessor and change our current token 1474 // to ';' so that the rest of the code recovers as though there were an 1475 // ';' after the definition. 1476 PP.EnterToken(Tok); 1477 Tok.setKind(tok::semi); 1478 } 1479} 1480 1481/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1482/// 1483/// base-clause : [C++ class.derived] 1484/// ':' base-specifier-list 1485/// base-specifier-list: 1486/// base-specifier '...'[opt] 1487/// base-specifier-list ',' base-specifier '...'[opt] 1488void Parser::ParseBaseClause(Decl *ClassDecl) { 1489 assert(Tok.is(tok::colon) && "Not a base clause"); 1490 ConsumeToken(); 1491 1492 // Build up an array of parsed base specifiers. 1493 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1494 1495 while (true) { 1496 // Parse a base-specifier. 1497 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1498 if (Result.isInvalid()) { 1499 // Skip the rest of this base specifier, up until the comma or 1500 // opening brace. 1501 SkipUntil(tok::comma, tok::l_brace, true, true); 1502 } else { 1503 // Add this to our array of base specifiers. 1504 BaseInfo.push_back(Result.get()); 1505 } 1506 1507 // If the next token is a comma, consume it and keep reading 1508 // base-specifiers. 1509 if (Tok.isNot(tok::comma)) break; 1510 1511 // Consume the comma. 1512 ConsumeToken(); 1513 } 1514 1515 // Attach the base specifiers 1516 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1517} 1518 1519/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1520/// one entry in the base class list of a class specifier, for example: 1521/// class foo : public bar, virtual private baz { 1522/// 'public bar' and 'virtual private baz' are each base-specifiers. 1523/// 1524/// base-specifier: [C++ class.derived] 1525/// ::[opt] nested-name-specifier[opt] class-name 1526/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1527/// base-type-specifier 1528/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1529/// base-type-specifier 1530Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1531 bool IsVirtual = false; 1532 SourceLocation StartLoc = Tok.getLocation(); 1533 1534 // Parse the 'virtual' keyword. 1535 if (Tok.is(tok::kw_virtual)) { 1536 ConsumeToken(); 1537 IsVirtual = true; 1538 } 1539 1540 // Parse an (optional) access specifier. 1541 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1542 if (Access != AS_none) 1543 ConsumeToken(); 1544 1545 // Parse the 'virtual' keyword (again!), in case it came after the 1546 // access specifier. 1547 if (Tok.is(tok::kw_virtual)) { 1548 SourceLocation VirtualLoc = ConsumeToken(); 1549 if (IsVirtual) { 1550 // Complain about duplicate 'virtual' 1551 Diag(VirtualLoc, diag::err_dup_virtual) 1552 << FixItHint::CreateRemoval(VirtualLoc); 1553 } 1554 1555 IsVirtual = true; 1556 } 1557 1558 // Parse the class-name. 1559 SourceLocation EndLocation; 1560 SourceLocation BaseLoc; 1561 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation); 1562 if (BaseType.isInvalid()) 1563 return true; 1564 1565 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1566 // actually part of the base-specifier-list grammar productions, but we 1567 // parse it here for convenience. 1568 SourceLocation EllipsisLoc; 1569 if (Tok.is(tok::ellipsis)) 1570 EllipsisLoc = ConsumeToken(); 1571 1572 // Find the complete source range for the base-specifier. 1573 SourceRange Range(StartLoc, EndLocation); 1574 1575 // Notify semantic analysis that we have parsed a complete 1576 // base-specifier. 1577 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1578 BaseType.get(), BaseLoc, EllipsisLoc); 1579} 1580 1581/// getAccessSpecifierIfPresent - Determine whether the next token is 1582/// a C++ access-specifier. 1583/// 1584/// access-specifier: [C++ class.derived] 1585/// 'private' 1586/// 'protected' 1587/// 'public' 1588AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1589 switch (Tok.getKind()) { 1590 default: return AS_none; 1591 case tok::kw_private: return AS_private; 1592 case tok::kw_protected: return AS_protected; 1593 case tok::kw_public: return AS_public; 1594 } 1595} 1596 1597/// \brief If the given declarator has any parts for which parsing has to be 1598/// delayed, e.g., default arguments, create a late-parsed method declaration 1599/// record to handle the parsing at the end of the class definition. 1600void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo, 1601 Decl *ThisDecl) { 1602 // We just declared a member function. If this member function 1603 // has any default arguments, we'll need to parse them later. 1604 LateParsedMethodDeclaration *LateMethod = 0; 1605 DeclaratorChunk::FunctionTypeInfo &FTI 1606 = DeclaratorInfo.getFunctionTypeInfo(); 1607 1608 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1609 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1610 if (!LateMethod) { 1611 // Push this method onto the stack of late-parsed method 1612 // declarations. 1613 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1614 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1615 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1616 1617 // Add all of the parameters prior to this one (they don't 1618 // have default arguments). 1619 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1620 for (unsigned I = 0; I < ParamIdx; ++I) 1621 LateMethod->DefaultArgs.push_back( 1622 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1623 } 1624 1625 // Add this parameter to the list of parameters (it may or may 1626 // not have a default argument). 1627 LateMethod->DefaultArgs.push_back( 1628 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1629 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1630 } 1631 } 1632} 1633 1634/// isCXX0XVirtSpecifier - Determine whether the given token is a C++0x 1635/// virt-specifier. 1636/// 1637/// virt-specifier: 1638/// override 1639/// final 1640VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier(const Token &Tok) const { 1641 if (!getLangOpts().CPlusPlus) 1642 return VirtSpecifiers::VS_None; 1643 1644 if (Tok.is(tok::identifier)) { 1645 IdentifierInfo *II = Tok.getIdentifierInfo(); 1646 1647 // Initialize the contextual keywords. 1648 if (!Ident_final) { 1649 Ident_final = &PP.getIdentifierTable().get("final"); 1650 Ident_override = &PP.getIdentifierTable().get("override"); 1651 } 1652 1653 if (II == Ident_override) 1654 return VirtSpecifiers::VS_Override; 1655 1656 if (II == Ident_final) 1657 return VirtSpecifiers::VS_Final; 1658 } 1659 1660 return VirtSpecifiers::VS_None; 1661} 1662 1663/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1664/// 1665/// virt-specifier-seq: 1666/// virt-specifier 1667/// virt-specifier-seq virt-specifier 1668void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1669 while (true) { 1670 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1671 if (Specifier == VirtSpecifiers::VS_None) 1672 return; 1673 1674 // C++ [class.mem]p8: 1675 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1676 const char *PrevSpec = 0; 1677 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1678 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1679 << PrevSpec 1680 << FixItHint::CreateRemoval(Tok.getLocation()); 1681 1682 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ? 1683 diag::warn_cxx98_compat_override_control_keyword : 1684 diag::ext_override_control_keyword) 1685 << VirtSpecifiers::getSpecifierName(Specifier); 1686 ConsumeToken(); 1687 } 1688} 1689 1690/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1691/// contextual 'final' keyword. 1692bool Parser::isCXX0XFinalKeyword() const { 1693 if (!getLangOpts().CPlusPlus) 1694 return false; 1695 1696 if (!Tok.is(tok::identifier)) 1697 return false; 1698 1699 // Initialize the contextual keywords. 1700 if (!Ident_final) { 1701 Ident_final = &PP.getIdentifierTable().get("final"); 1702 Ident_override = &PP.getIdentifierTable().get("override"); 1703 } 1704 1705 return Tok.getIdentifierInfo() == Ident_final; 1706} 1707 1708/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1709/// 1710/// member-declaration: 1711/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1712/// function-definition ';'[opt] 1713/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1714/// using-declaration [TODO] 1715/// [C++0x] static_assert-declaration 1716/// template-declaration 1717/// [GNU] '__extension__' member-declaration 1718/// 1719/// member-declarator-list: 1720/// member-declarator 1721/// member-declarator-list ',' member-declarator 1722/// 1723/// member-declarator: 1724/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1725/// declarator constant-initializer[opt] 1726/// [C++11] declarator brace-or-equal-initializer[opt] 1727/// identifier[opt] ':' constant-expression 1728/// 1729/// virt-specifier-seq: 1730/// virt-specifier 1731/// virt-specifier-seq virt-specifier 1732/// 1733/// virt-specifier: 1734/// override 1735/// final 1736/// 1737/// pure-specifier: 1738/// '= 0' 1739/// 1740/// constant-initializer: 1741/// '=' constant-expression 1742/// 1743void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1744 AttributeList *AccessAttrs, 1745 const ParsedTemplateInfo &TemplateInfo, 1746 ParsingDeclRAIIObject *TemplateDiags) { 1747 if (Tok.is(tok::at)) { 1748 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1749 Diag(Tok, diag::err_at_defs_cxx); 1750 else 1751 Diag(Tok, diag::err_at_in_class); 1752 1753 ConsumeToken(); 1754 SkipUntil(tok::r_brace); 1755 return; 1756 } 1757 1758 // Access declarations. 1759 bool MalformedTypeSpec = false; 1760 if (!TemplateInfo.Kind && 1761 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))) { 1762 if (TryAnnotateCXXScopeToken()) 1763 MalformedTypeSpec = true; 1764 1765 bool isAccessDecl; 1766 if (Tok.isNot(tok::annot_cxxscope)) 1767 isAccessDecl = false; 1768 else if (NextToken().is(tok::identifier)) 1769 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1770 else 1771 isAccessDecl = NextToken().is(tok::kw_operator); 1772 1773 if (isAccessDecl) { 1774 // Collect the scope specifier token we annotated earlier. 1775 CXXScopeSpec SS; 1776 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1777 /*EnteringContext=*/false); 1778 1779 // Try to parse an unqualified-id. 1780 SourceLocation TemplateKWLoc; 1781 UnqualifiedId Name; 1782 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), 1783 TemplateKWLoc, Name)) { 1784 SkipUntil(tok::semi); 1785 return; 1786 } 1787 1788 // TODO: recover from mistakenly-qualified operator declarations. 1789 if (ExpectAndConsume(tok::semi, 1790 diag::err_expected_semi_after, 1791 "access declaration", 1792 tok::semi)) 1793 return; 1794 1795 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1796 false, SourceLocation(), 1797 SS, Name, 1798 /* AttrList */ 0, 1799 /* IsTypeName */ false, 1800 SourceLocation()); 1801 return; 1802 } 1803 } 1804 1805 // static_assert-declaration 1806 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1807 // FIXME: Check for templates 1808 SourceLocation DeclEnd; 1809 ParseStaticAssertDeclaration(DeclEnd); 1810 return; 1811 } 1812 1813 if (Tok.is(tok::kw_template)) { 1814 assert(!TemplateInfo.TemplateParams && 1815 "Nested template improperly parsed?"); 1816 SourceLocation DeclEnd; 1817 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1818 AS, AccessAttrs); 1819 return; 1820 } 1821 1822 // Handle: member-declaration ::= '__extension__' member-declaration 1823 if (Tok.is(tok::kw___extension__)) { 1824 // __extension__ silences extension warnings in the subexpression. 1825 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1826 ConsumeToken(); 1827 return ParseCXXClassMemberDeclaration(AS, AccessAttrs, 1828 TemplateInfo, TemplateDiags); 1829 } 1830 1831 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1832 // is a bitfield. 1833 ColonProtectionRAIIObject X(*this); 1834 1835 ParsedAttributesWithRange attrs(AttrFactory); 1836 // Optional C++0x attribute-specifier 1837 MaybeParseCXX0XAttributes(attrs); 1838 MaybeParseMicrosoftAttributes(attrs); 1839 1840 if (Tok.is(tok::kw_using)) { 1841 ProhibitAttributes(attrs); 1842 1843 // Eat 'using'. 1844 SourceLocation UsingLoc = ConsumeToken(); 1845 1846 if (Tok.is(tok::kw_namespace)) { 1847 Diag(UsingLoc, diag::err_using_namespace_in_class); 1848 SkipUntil(tok::semi, true, true); 1849 } else { 1850 SourceLocation DeclEnd; 1851 // Otherwise, it must be a using-declaration or an alias-declaration. 1852 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1853 UsingLoc, DeclEnd, AS); 1854 } 1855 return; 1856 } 1857 1858 // Hold late-parsed attributes so we can attach a Decl to them later. 1859 LateParsedAttrList CommonLateParsedAttrs; 1860 1861 // decl-specifier-seq: 1862 // Parse the common declaration-specifiers piece. 1863 ParsingDeclSpec DS(*this, TemplateDiags); 1864 DS.takeAttributesFrom(attrs); 1865 if (MalformedTypeSpec) 1866 DS.SetTypeSpecError(); 1867 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class, 1868 &CommonLateParsedAttrs); 1869 1870 MultiTemplateParamsArg TemplateParams(Actions, 1871 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1872 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1873 1874 if (Tok.is(tok::semi)) { 1875 ConsumeToken(); 1876 Decl *TheDecl = 1877 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1878 DS.complete(TheDecl); 1879 return; 1880 } 1881 1882 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1883 VirtSpecifiers VS; 1884 1885 // Hold late-parsed attributes so we can attach a Decl to them later. 1886 LateParsedAttrList LateParsedAttrs; 1887 1888 SourceLocation EqualLoc; 1889 bool HasInitializer = false; 1890 ExprResult Init; 1891 if (Tok.isNot(tok::colon)) { 1892 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1893 ColonProtectionRAIIObject X(*this); 1894 1895 // Parse the first declarator. 1896 ParseDeclarator(DeclaratorInfo); 1897 // Error parsing the declarator? 1898 if (!DeclaratorInfo.hasName()) { 1899 // If so, skip until the semi-colon or a }. 1900 SkipUntil(tok::r_brace, true, true); 1901 if (Tok.is(tok::semi)) 1902 ConsumeToken(); 1903 return; 1904 } 1905 1906 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1907 1908 // If attributes exist after the declarator, but before an '{', parse them. 1909 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1910 1911 // MSVC permits pure specifier on inline functions declared at class scope. 1912 // Hence check for =0 before checking for function definition. 1913 if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) && 1914 DeclaratorInfo.isFunctionDeclarator() && 1915 NextToken().is(tok::numeric_constant)) { 1916 EqualLoc = ConsumeToken(); 1917 Init = ParseInitializer(); 1918 if (Init.isInvalid()) 1919 SkipUntil(tok::comma, true, true); 1920 else 1921 HasInitializer = true; 1922 } 1923 1924 FunctionDefinitionKind DefinitionKind = FDK_Declaration; 1925 // function-definition: 1926 // 1927 // In C++11, a non-function declarator followed by an open brace is a 1928 // braced-init-list for an in-class member initialization, not an 1929 // erroneous function definition. 1930 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus0x) { 1931 DefinitionKind = FDK_Definition; 1932 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1933 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1934 DefinitionKind = FDK_Definition; 1935 } else if (Tok.is(tok::equal)) { 1936 const Token &KW = NextToken(); 1937 if (KW.is(tok::kw_default)) 1938 DefinitionKind = FDK_Defaulted; 1939 else if (KW.is(tok::kw_delete)) 1940 DefinitionKind = FDK_Deleted; 1941 } 1942 } 1943 1944 if (DefinitionKind) { 1945 if (!DeclaratorInfo.isFunctionDeclarator()) { 1946 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params); 1947 ConsumeBrace(); 1948 SkipUntil(tok::r_brace, /*StopAtSemi*/false); 1949 1950 // Consume the optional ';' 1951 if (Tok.is(tok::semi)) 1952 ConsumeToken(); 1953 return; 1954 } 1955 1956 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1957 Diag(DeclaratorInfo.getIdentifierLoc(), 1958 diag::err_function_declared_typedef); 1959 // This recovery skips the entire function body. It would be nice 1960 // to simply call ParseCXXInlineMethodDef() below, however Sema 1961 // assumes the declarator represents a function, not a typedef. 1962 ConsumeBrace(); 1963 SkipUntil(tok::r_brace, /*StopAtSemi*/false); 1964 1965 // Consume the optional ';' 1966 if (Tok.is(tok::semi)) 1967 ConsumeToken(); 1968 return; 1969 } 1970 1971 Decl *FunDecl = 1972 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo, 1973 VS, DefinitionKind, Init); 1974 1975 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) { 1976 CommonLateParsedAttrs[i]->addDecl(FunDecl); 1977 } 1978 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1979 LateParsedAttrs[i]->addDecl(FunDecl); 1980 } 1981 LateParsedAttrs.clear(); 1982 1983 // Consume the ';' - it's optional unless we have a delete or default 1984 if (Tok.is(tok::semi)) 1985 ConsumeExtraSemi(AfterDefinition); 1986 1987 return; 1988 } 1989 } 1990 1991 // member-declarator-list: 1992 // member-declarator 1993 // member-declarator-list ',' member-declarator 1994 1995 SmallVector<Decl *, 8> DeclsInGroup; 1996 ExprResult BitfieldSize; 1997 bool ExpectSemi = true; 1998 1999 while (1) { 2000 // member-declarator: 2001 // declarator pure-specifier[opt] 2002 // declarator brace-or-equal-initializer[opt] 2003 // identifier[opt] ':' constant-expression 2004 if (Tok.is(tok::colon)) { 2005 ConsumeToken(); 2006 BitfieldSize = ParseConstantExpression(); 2007 if (BitfieldSize.isInvalid()) 2008 SkipUntil(tok::comma, true, true); 2009 } 2010 2011 // If a simple-asm-expr is present, parse it. 2012 if (Tok.is(tok::kw_asm)) { 2013 SourceLocation Loc; 2014 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 2015 if (AsmLabel.isInvalid()) 2016 SkipUntil(tok::comma, true, true); 2017 2018 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 2019 DeclaratorInfo.SetRangeEnd(Loc); 2020 } 2021 2022 // If attributes exist after the declarator, parse them. 2023 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 2024 2025 // FIXME: When g++ adds support for this, we'll need to check whether it 2026 // goes before or after the GNU attributes and __asm__. 2027 ParseOptionalCXX0XVirtSpecifierSeq(VS); 2028 2029 InClassInitStyle HasInClassInit = ICIS_NoInit; 2030 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) { 2031 if (BitfieldSize.get()) { 2032 Diag(Tok, diag::err_bitfield_member_init); 2033 SkipUntil(tok::comma, true, true); 2034 } else { 2035 HasInitializer = true; 2036 if (!DeclaratorInfo.isDeclarationOfFunction() && 2037 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2038 != DeclSpec::SCS_static && 2039 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2040 != DeclSpec::SCS_typedef) 2041 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit; 2042 } 2043 } 2044 2045 // NOTE: If Sema is the Action module and declarator is an instance field, 2046 // this call will *not* return the created decl; It will return null. 2047 // See Sema::ActOnCXXMemberDeclarator for details. 2048 2049 Decl *ThisDecl = 0; 2050 if (DS.isFriendSpecified()) { 2051 // TODO: handle initializers, bitfields, 'delete' 2052 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 2053 move(TemplateParams)); 2054 } else { 2055 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 2056 DeclaratorInfo, 2057 move(TemplateParams), 2058 BitfieldSize.release(), 2059 VS, HasInClassInit); 2060 if (AccessAttrs) 2061 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs, 2062 false, true); 2063 } 2064 2065 // Set the Decl for any late parsed attributes 2066 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) { 2067 CommonLateParsedAttrs[i]->addDecl(ThisDecl); 2068 } 2069 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 2070 LateParsedAttrs[i]->addDecl(ThisDecl); 2071 } 2072 LateParsedAttrs.clear(); 2073 2074 // Handle the initializer. 2075 if (HasInClassInit != ICIS_NoInit) { 2076 // The initializer was deferred; parse it and cache the tokens. 2077 Diag(Tok, getLangOpts().CPlusPlus0x ? 2078 diag::warn_cxx98_compat_nonstatic_member_init : 2079 diag::ext_nonstatic_member_init); 2080 2081 if (DeclaratorInfo.isArrayOfUnknownBound()) { 2082 // C++11 [dcl.array]p3: An array bound may also be omitted when the 2083 // declarator is followed by an initializer. 2084 // 2085 // A brace-or-equal-initializer for a member-declarator is not an 2086 // initializer in the grammar, so this is ill-formed. 2087 Diag(Tok, diag::err_incomplete_array_member_init); 2088 SkipUntil(tok::comma, true, true); 2089 if (ThisDecl) 2090 // Avoid later warnings about a class member of incomplete type. 2091 ThisDecl->setInvalidDecl(); 2092 } else 2093 ParseCXXNonStaticMemberInitializer(ThisDecl); 2094 } else if (HasInitializer) { 2095 // Normal initializer. 2096 if (!Init.isUsable()) 2097 Init = ParseCXXMemberInitializer(ThisDecl, 2098 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 2099 2100 if (Init.isInvalid()) 2101 SkipUntil(tok::comma, true, true); 2102 else if (ThisDecl) 2103 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(), 2104 DS.getTypeSpecType() == DeclSpec::TST_auto); 2105 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) { 2106 // No initializer. 2107 Actions.ActOnUninitializedDecl(ThisDecl, 2108 DS.getTypeSpecType() == DeclSpec::TST_auto); 2109 } 2110 2111 if (ThisDecl) { 2112 Actions.FinalizeDeclaration(ThisDecl); 2113 DeclsInGroup.push_back(ThisDecl); 2114 } 2115 2116 if (ThisDecl && DeclaratorInfo.isFunctionDeclarator() && 2117 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2118 != DeclSpec::SCS_typedef) { 2119 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl); 2120 } 2121 2122 DeclaratorInfo.complete(ThisDecl); 2123 2124 // If we don't have a comma, it is either the end of the list (a ';') 2125 // or an error, bail out. 2126 if (Tok.isNot(tok::comma)) 2127 break; 2128 2129 // Consume the comma. 2130 SourceLocation CommaLoc = ConsumeToken(); 2131 2132 if (Tok.isAtStartOfLine() && 2133 !MightBeDeclarator(Declarator::MemberContext)) { 2134 // This comma was followed by a line-break and something which can't be 2135 // the start of a declarator. The comma was probably a typo for a 2136 // semicolon. 2137 Diag(CommaLoc, diag::err_expected_semi_declaration) 2138 << FixItHint::CreateReplacement(CommaLoc, ";"); 2139 ExpectSemi = false; 2140 break; 2141 } 2142 2143 // Parse the next declarator. 2144 DeclaratorInfo.clear(); 2145 VS.clear(); 2146 BitfieldSize = true; 2147 Init = true; 2148 HasInitializer = false; 2149 DeclaratorInfo.setCommaLoc(CommaLoc); 2150 2151 // Attributes are only allowed on the second declarator. 2152 MaybeParseGNUAttributes(DeclaratorInfo); 2153 2154 if (Tok.isNot(tok::colon)) 2155 ParseDeclarator(DeclaratorInfo); 2156 } 2157 2158 if (ExpectSemi && 2159 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 2160 // Skip to end of block or statement. 2161 SkipUntil(tok::r_brace, true, true); 2162 // If we stopped at a ';', eat it. 2163 if (Tok.is(tok::semi)) ConsumeToken(); 2164 return; 2165 } 2166 2167 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 2168 DeclsInGroup.size()); 2169} 2170 2171/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 2172/// pure-specifier. Also detect and reject any attempted defaulted/deleted 2173/// function definition. The location of the '=', if any, will be placed in 2174/// EqualLoc. 2175/// 2176/// pure-specifier: 2177/// '= 0' 2178/// 2179/// brace-or-equal-initializer: 2180/// '=' initializer-expression 2181/// braced-init-list 2182/// 2183/// initializer-clause: 2184/// assignment-expression 2185/// braced-init-list 2186/// 2187/// defaulted/deleted function-definition: 2188/// '=' 'default' 2189/// '=' 'delete' 2190/// 2191/// Prior to C++0x, the assignment-expression in an initializer-clause must 2192/// be a constant-expression. 2193ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction, 2194 SourceLocation &EqualLoc) { 2195 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 2196 && "Data member initializer not starting with '=' or '{'"); 2197 2198 EnterExpressionEvaluationContext Context(Actions, 2199 Sema::PotentiallyEvaluated, 2200 D); 2201 if (Tok.is(tok::equal)) { 2202 EqualLoc = ConsumeToken(); 2203 if (Tok.is(tok::kw_delete)) { 2204 // In principle, an initializer of '= delete p;' is legal, but it will 2205 // never type-check. It's better to diagnose it as an ill-formed expression 2206 // than as an ill-formed deleted non-function member. 2207 // An initializer of '= delete p, foo' will never be parsed, because 2208 // a top-level comma always ends the initializer expression. 2209 const Token &Next = NextToken(); 2210 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 2211 Next.is(tok::eof)) { 2212 if (IsFunction) 2213 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 2214 << 1 /* delete */; 2215 else 2216 Diag(ConsumeToken(), diag::err_deleted_non_function); 2217 return ExprResult(); 2218 } 2219 } else if (Tok.is(tok::kw_default)) { 2220 if (IsFunction) 2221 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2222 << 0 /* default */; 2223 else 2224 Diag(ConsumeToken(), diag::err_default_special_members); 2225 return ExprResult(); 2226 } 2227 2228 } 2229 return ParseInitializer(); 2230} 2231 2232/// ParseCXXMemberSpecification - Parse the class definition. 2233/// 2234/// member-specification: 2235/// member-declaration member-specification[opt] 2236/// access-specifier ':' member-specification[opt] 2237/// 2238void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2239 unsigned TagType, Decl *TagDecl) { 2240 assert((TagType == DeclSpec::TST_struct || 2241 TagType == DeclSpec::TST_union || 2242 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2243 2244 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2245 "parsing struct/union/class body"); 2246 2247 // Determine whether this is a non-nested class. Note that local 2248 // classes are *not* considered to be nested classes. 2249 bool NonNestedClass = true; 2250 if (!ClassStack.empty()) { 2251 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2252 if (S->isClassScope()) { 2253 // We're inside a class scope, so this is a nested class. 2254 NonNestedClass = false; 2255 break; 2256 } 2257 2258 if ((S->getFlags() & Scope::FnScope)) { 2259 // If we're in a function or function template declared in the 2260 // body of a class, then this is a local class rather than a 2261 // nested class. 2262 const Scope *Parent = S->getParent(); 2263 if (Parent->isTemplateParamScope()) 2264 Parent = Parent->getParent(); 2265 if (Parent->isClassScope()) 2266 break; 2267 } 2268 } 2269 } 2270 2271 // Enter a scope for the class. 2272 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2273 2274 // Note that we are parsing a new (potentially-nested) class definition. 2275 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2276 2277 if (TagDecl) 2278 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2279 2280 SourceLocation FinalLoc; 2281 2282 // Parse the optional 'final' keyword. 2283 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) { 2284 assert(isCXX0XFinalKeyword() && "not a class definition"); 2285 FinalLoc = ConsumeToken(); 2286 2287 Diag(FinalLoc, getLangOpts().CPlusPlus0x ? 2288 diag::warn_cxx98_compat_override_control_keyword : 2289 diag::ext_override_control_keyword) << "final"; 2290 } 2291 2292 if (Tok.is(tok::colon)) { 2293 ParseBaseClause(TagDecl); 2294 2295 if (!Tok.is(tok::l_brace)) { 2296 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2297 2298 if (TagDecl) 2299 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2300 return; 2301 } 2302 } 2303 2304 assert(Tok.is(tok::l_brace)); 2305 BalancedDelimiterTracker T(*this, tok::l_brace); 2306 T.consumeOpen(); 2307 2308 if (TagDecl) 2309 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2310 T.getOpenLocation()); 2311 2312 // C++ 11p3: Members of a class defined with the keyword class are private 2313 // by default. Members of a class defined with the keywords struct or union 2314 // are public by default. 2315 AccessSpecifier CurAS; 2316 if (TagType == DeclSpec::TST_class) 2317 CurAS = AS_private; 2318 else 2319 CurAS = AS_public; 2320 ParsedAttributes AccessAttrs(AttrFactory); 2321 2322 if (TagDecl) { 2323 // While we still have something to read, read the member-declarations. 2324 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2325 // Each iteration of this loop reads one member-declaration. 2326 2327 if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2328 Tok.is(tok::kw___if_not_exists))) { 2329 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2330 continue; 2331 } 2332 2333 // Check for extraneous top-level semicolon. 2334 if (Tok.is(tok::semi)) { 2335 ConsumeExtraSemi(InsideStruct, 2336 DeclSpec::getSpecifierName((DeclSpec::TST)TagType)); 2337 continue; 2338 } 2339 2340 if (Tok.is(tok::annot_pragma_vis)) { 2341 HandlePragmaVisibility(); 2342 continue; 2343 } 2344 2345 if (Tok.is(tok::annot_pragma_pack)) { 2346 HandlePragmaPack(); 2347 continue; 2348 } 2349 2350 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2351 if (AS != AS_none) { 2352 // Current token is a C++ access specifier. 2353 CurAS = AS; 2354 SourceLocation ASLoc = Tok.getLocation(); 2355 unsigned TokLength = Tok.getLength(); 2356 ConsumeToken(); 2357 AccessAttrs.clear(); 2358 MaybeParseGNUAttributes(AccessAttrs); 2359 2360 SourceLocation EndLoc; 2361 if (Tok.is(tok::colon)) { 2362 EndLoc = Tok.getLocation(); 2363 ConsumeToken(); 2364 } else if (Tok.is(tok::semi)) { 2365 EndLoc = Tok.getLocation(); 2366 ConsumeToken(); 2367 Diag(EndLoc, diag::err_expected_colon) 2368 << FixItHint::CreateReplacement(EndLoc, ":"); 2369 } else { 2370 EndLoc = ASLoc.getLocWithOffset(TokLength); 2371 Diag(EndLoc, diag::err_expected_colon) 2372 << FixItHint::CreateInsertion(EndLoc, ":"); 2373 } 2374 2375 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc, 2376 AccessAttrs.getList())) { 2377 // found another attribute than only annotations 2378 AccessAttrs.clear(); 2379 } 2380 2381 continue; 2382 } 2383 2384 // FIXME: Make sure we don't have a template here. 2385 2386 // Parse all the comma separated declarators. 2387 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList()); 2388 } 2389 2390 T.consumeClose(); 2391 } else { 2392 SkipUntil(tok::r_brace, false, false); 2393 } 2394 2395 // If attributes exist after class contents, parse them. 2396 ParsedAttributes attrs(AttrFactory); 2397 MaybeParseGNUAttributes(attrs); 2398 2399 if (TagDecl) 2400 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2401 T.getOpenLocation(), 2402 T.getCloseLocation(), 2403 attrs.getList()); 2404 2405 // C++11 [class.mem]p2: 2406 // Within the class member-specification, the class is regarded as complete 2407 // within function bodies, default arguments, and 2408 // brace-or-equal-initializers for non-static data members (including such 2409 // things in nested classes). 2410 if (TagDecl && NonNestedClass) { 2411 // We are not inside a nested class. This class and its nested classes 2412 // are complete and we can parse the delayed portions of method 2413 // declarations and the lexed inline method definitions, along with any 2414 // delayed attributes. 2415 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2416 ParseLexedAttributes(getCurrentClass()); 2417 ParseLexedMethodDeclarations(getCurrentClass()); 2418 2419 // We've finished with all pending member declarations. 2420 Actions.ActOnFinishCXXMemberDecls(); 2421 2422 ParseLexedMemberInitializers(getCurrentClass()); 2423 ParseLexedMethodDefs(getCurrentClass()); 2424 PrevTokLocation = SavedPrevTokLocation; 2425 } 2426 2427 if (TagDecl) 2428 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 2429 T.getCloseLocation()); 2430 2431 // Leave the class scope. 2432 ParsingDef.Pop(); 2433 ClassScope.Exit(); 2434} 2435 2436/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2437/// which explicitly initializes the members or base classes of a 2438/// class (C++ [class.base.init]). For example, the three initializers 2439/// after the ':' in the Derived constructor below: 2440/// 2441/// @code 2442/// class Base { }; 2443/// class Derived : Base { 2444/// int x; 2445/// float f; 2446/// public: 2447/// Derived(float f) : Base(), x(17), f(f) { } 2448/// }; 2449/// @endcode 2450/// 2451/// [C++] ctor-initializer: 2452/// ':' mem-initializer-list 2453/// 2454/// [C++] mem-initializer-list: 2455/// mem-initializer ...[opt] 2456/// mem-initializer ...[opt] , mem-initializer-list 2457void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2458 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2459 2460 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2461 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2462 SourceLocation ColonLoc = ConsumeToken(); 2463 2464 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2465 bool AnyErrors = false; 2466 2467 do { 2468 if (Tok.is(tok::code_completion)) { 2469 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2470 MemInitializers.data(), 2471 MemInitializers.size()); 2472 return cutOffParsing(); 2473 } else { 2474 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2475 if (!MemInit.isInvalid()) 2476 MemInitializers.push_back(MemInit.get()); 2477 else 2478 AnyErrors = true; 2479 } 2480 2481 if (Tok.is(tok::comma)) 2482 ConsumeToken(); 2483 else if (Tok.is(tok::l_brace)) 2484 break; 2485 // If the next token looks like a base or member initializer, assume that 2486 // we're just missing a comma. 2487 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2488 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2489 Diag(Loc, diag::err_ctor_init_missing_comma) 2490 << FixItHint::CreateInsertion(Loc, ", "); 2491 } else { 2492 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2493 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2494 SkipUntil(tok::l_brace, true, true); 2495 break; 2496 } 2497 } while (true); 2498 2499 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2500 MemInitializers.data(), MemInitializers.size(), 2501 AnyErrors); 2502} 2503 2504/// ParseMemInitializer - Parse a C++ member initializer, which is 2505/// part of a constructor initializer that explicitly initializes one 2506/// member or base class (C++ [class.base.init]). See 2507/// ParseConstructorInitializer for an example. 2508/// 2509/// [C++] mem-initializer: 2510/// mem-initializer-id '(' expression-list[opt] ')' 2511/// [C++0x] mem-initializer-id braced-init-list 2512/// 2513/// [C++] mem-initializer-id: 2514/// '::'[opt] nested-name-specifier[opt] class-name 2515/// identifier 2516Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2517 // parse '::'[opt] nested-name-specifier[opt] 2518 CXXScopeSpec SS; 2519 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 2520 ParsedType TemplateTypeTy; 2521 if (Tok.is(tok::annot_template_id)) { 2522 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2523 if (TemplateId->Kind == TNK_Type_template || 2524 TemplateId->Kind == TNK_Dependent_template_name) { 2525 AnnotateTemplateIdTokenAsType(); 2526 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2527 TemplateTypeTy = getTypeAnnotation(Tok); 2528 } 2529 } 2530 // Uses of decltype will already have been converted to annot_decltype by 2531 // ParseOptionalCXXScopeSpecifier at this point. 2532 if (!TemplateTypeTy && Tok.isNot(tok::identifier) 2533 && Tok.isNot(tok::annot_decltype)) { 2534 Diag(Tok, diag::err_expected_member_or_base_name); 2535 return true; 2536 } 2537 2538 IdentifierInfo *II = 0; 2539 DeclSpec DS(AttrFactory); 2540 SourceLocation IdLoc = Tok.getLocation(); 2541 if (Tok.is(tok::annot_decltype)) { 2542 // Get the decltype expression, if there is one. 2543 ParseDecltypeSpecifier(DS); 2544 } else { 2545 if (Tok.is(tok::identifier)) 2546 // Get the identifier. This may be a member name or a class name, 2547 // but we'll let the semantic analysis determine which it is. 2548 II = Tok.getIdentifierInfo(); 2549 ConsumeToken(); 2550 } 2551 2552 2553 // Parse the '('. 2554 if (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace)) { 2555 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2556 2557 ExprResult InitList = ParseBraceInitializer(); 2558 if (InitList.isInvalid()) 2559 return true; 2560 2561 SourceLocation EllipsisLoc; 2562 if (Tok.is(tok::ellipsis)) 2563 EllipsisLoc = ConsumeToken(); 2564 2565 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2566 TemplateTypeTy, DS, IdLoc, 2567 InitList.take(), EllipsisLoc); 2568 } else if(Tok.is(tok::l_paren)) { 2569 BalancedDelimiterTracker T(*this, tok::l_paren); 2570 T.consumeOpen(); 2571 2572 // Parse the optional expression-list. 2573 ExprVector ArgExprs(Actions); 2574 CommaLocsTy CommaLocs; 2575 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2576 SkipUntil(tok::r_paren); 2577 return true; 2578 } 2579 2580 T.consumeClose(); 2581 2582 SourceLocation EllipsisLoc; 2583 if (Tok.is(tok::ellipsis)) 2584 EllipsisLoc = ConsumeToken(); 2585 2586 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2587 TemplateTypeTy, DS, IdLoc, 2588 T.getOpenLocation(), ArgExprs.take(), 2589 ArgExprs.size(), T.getCloseLocation(), 2590 EllipsisLoc); 2591 } 2592 2593 Diag(Tok, getLangOpts().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2594 : diag::err_expected_lparen); 2595 return true; 2596} 2597 2598/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2599/// 2600/// exception-specification: 2601/// dynamic-exception-specification 2602/// noexcept-specification 2603/// 2604/// noexcept-specification: 2605/// 'noexcept' 2606/// 'noexcept' '(' constant-expression ')' 2607ExceptionSpecificationType 2608Parser::tryParseExceptionSpecification( 2609 SourceRange &SpecificationRange, 2610 SmallVectorImpl<ParsedType> &DynamicExceptions, 2611 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2612 ExprResult &NoexceptExpr) { 2613 ExceptionSpecificationType Result = EST_None; 2614 2615 // See if there's a dynamic specification. 2616 if (Tok.is(tok::kw_throw)) { 2617 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2618 DynamicExceptions, 2619 DynamicExceptionRanges); 2620 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2621 "Produced different number of exception types and ranges."); 2622 } 2623 2624 // If there's no noexcept specification, we're done. 2625 if (Tok.isNot(tok::kw_noexcept)) 2626 return Result; 2627 2628 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); 2629 2630 // If we already had a dynamic specification, parse the noexcept for, 2631 // recovery, but emit a diagnostic and don't store the results. 2632 SourceRange NoexceptRange; 2633 ExceptionSpecificationType NoexceptType = EST_None; 2634 2635 SourceLocation KeywordLoc = ConsumeToken(); 2636 if (Tok.is(tok::l_paren)) { 2637 // There is an argument. 2638 BalancedDelimiterTracker T(*this, tok::l_paren); 2639 T.consumeOpen(); 2640 NoexceptType = EST_ComputedNoexcept; 2641 NoexceptExpr = ParseConstantExpression(); 2642 // The argument must be contextually convertible to bool. We use 2643 // ActOnBooleanCondition for this purpose. 2644 if (!NoexceptExpr.isInvalid()) 2645 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2646 NoexceptExpr.get()); 2647 T.consumeClose(); 2648 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); 2649 } else { 2650 // There is no argument. 2651 NoexceptType = EST_BasicNoexcept; 2652 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2653 } 2654 2655 if (Result == EST_None) { 2656 SpecificationRange = NoexceptRange; 2657 Result = NoexceptType; 2658 2659 // If there's a dynamic specification after a noexcept specification, 2660 // parse that and ignore the results. 2661 if (Tok.is(tok::kw_throw)) { 2662 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2663 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2664 DynamicExceptionRanges); 2665 } 2666 } else { 2667 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2668 } 2669 2670 return Result; 2671} 2672 2673/// ParseDynamicExceptionSpecification - Parse a C++ 2674/// dynamic-exception-specification (C++ [except.spec]). 2675/// 2676/// dynamic-exception-specification: 2677/// 'throw' '(' type-id-list [opt] ')' 2678/// [MS] 'throw' '(' '...' ')' 2679/// 2680/// type-id-list: 2681/// type-id ... [opt] 2682/// type-id-list ',' type-id ... [opt] 2683/// 2684ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2685 SourceRange &SpecificationRange, 2686 SmallVectorImpl<ParsedType> &Exceptions, 2687 SmallVectorImpl<SourceRange> &Ranges) { 2688 assert(Tok.is(tok::kw_throw) && "expected throw"); 2689 2690 SpecificationRange.setBegin(ConsumeToken()); 2691 BalancedDelimiterTracker T(*this, tok::l_paren); 2692 if (T.consumeOpen()) { 2693 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2694 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2695 return EST_DynamicNone; 2696 } 2697 2698 // Parse throw(...), a Microsoft extension that means "this function 2699 // can throw anything". 2700 if (Tok.is(tok::ellipsis)) { 2701 SourceLocation EllipsisLoc = ConsumeToken(); 2702 if (!getLangOpts().MicrosoftExt) 2703 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2704 T.consumeClose(); 2705 SpecificationRange.setEnd(T.getCloseLocation()); 2706 return EST_MSAny; 2707 } 2708 2709 // Parse the sequence of type-ids. 2710 SourceRange Range; 2711 while (Tok.isNot(tok::r_paren)) { 2712 TypeResult Res(ParseTypeName(&Range)); 2713 2714 if (Tok.is(tok::ellipsis)) { 2715 // C++0x [temp.variadic]p5: 2716 // - In a dynamic-exception-specification (15.4); the pattern is a 2717 // type-id. 2718 SourceLocation Ellipsis = ConsumeToken(); 2719 Range.setEnd(Ellipsis); 2720 if (!Res.isInvalid()) 2721 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2722 } 2723 2724 if (!Res.isInvalid()) { 2725 Exceptions.push_back(Res.get()); 2726 Ranges.push_back(Range); 2727 } 2728 2729 if (Tok.is(tok::comma)) 2730 ConsumeToken(); 2731 else 2732 break; 2733 } 2734 2735 T.consumeClose(); 2736 SpecificationRange.setEnd(T.getCloseLocation()); 2737 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2738} 2739 2740/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2741/// function declaration. 2742TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2743 assert(Tok.is(tok::arrow) && "expected arrow"); 2744 2745 ConsumeToken(); 2746 2747 return ParseTypeName(&Range, Declarator::TrailingReturnContext); 2748} 2749 2750/// \brief We have just started parsing the definition of a new class, 2751/// so push that class onto our stack of classes that is currently 2752/// being parsed. 2753Sema::ParsingClassState 2754Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2755 assert((NonNestedClass || !ClassStack.empty()) && 2756 "Nested class without outer class"); 2757 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2758 return Actions.PushParsingClass(); 2759} 2760 2761/// \brief Deallocate the given parsed class and all of its nested 2762/// classes. 2763void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2764 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2765 delete Class->LateParsedDeclarations[I]; 2766 delete Class; 2767} 2768 2769/// \brief Pop the top class of the stack of classes that are 2770/// currently being parsed. 2771/// 2772/// This routine should be called when we have finished parsing the 2773/// definition of a class, but have not yet popped the Scope 2774/// associated with the class's definition. 2775/// 2776/// \returns true if the class we've popped is a top-level class, 2777/// false otherwise. 2778void Parser::PopParsingClass(Sema::ParsingClassState state) { 2779 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2780 2781 Actions.PopParsingClass(state); 2782 2783 ParsingClass *Victim = ClassStack.top(); 2784 ClassStack.pop(); 2785 if (Victim->TopLevelClass) { 2786 // Deallocate all of the nested classes of this class, 2787 // recursively: we don't need to keep any of this information. 2788 DeallocateParsedClasses(Victim); 2789 return; 2790 } 2791 assert(!ClassStack.empty() && "Missing top-level class?"); 2792 2793 if (Victim->LateParsedDeclarations.empty()) { 2794 // The victim is a nested class, but we will not need to perform 2795 // any processing after the definition of this class since it has 2796 // no members whose handling was delayed. Therefore, we can just 2797 // remove this nested class. 2798 DeallocateParsedClasses(Victim); 2799 return; 2800 } 2801 2802 // This nested class has some members that will need to be processed 2803 // after the top-level class is completely defined. Therefore, add 2804 // it to the list of nested classes within its parent. 2805 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2806 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2807 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2808} 2809 2810/// \brief Try to parse an 'identifier' which appears within an attribute-token. 2811/// 2812/// \return the parsed identifier on success, and 0 if the next token is not an 2813/// attribute-token. 2814/// 2815/// C++11 [dcl.attr.grammar]p3: 2816/// If a keyword or an alternative token that satisfies the syntactic 2817/// requirements of an identifier is contained in an attribute-token, 2818/// it is considered an identifier. 2819IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) { 2820 switch (Tok.getKind()) { 2821 default: 2822 // Identifiers and keywords have identifier info attached. 2823 if (IdentifierInfo *II = Tok.getIdentifierInfo()) { 2824 Loc = ConsumeToken(); 2825 return II; 2826 } 2827 return 0; 2828 2829 case tok::ampamp: // 'and' 2830 case tok::pipe: // 'bitor' 2831 case tok::pipepipe: // 'or' 2832 case tok::caret: // 'xor' 2833 case tok::tilde: // 'compl' 2834 case tok::amp: // 'bitand' 2835 case tok::ampequal: // 'and_eq' 2836 case tok::pipeequal: // 'or_eq' 2837 case tok::caretequal: // 'xor_eq' 2838 case tok::exclaim: // 'not' 2839 case tok::exclaimequal: // 'not_eq' 2840 // Alternative tokens do not have identifier info, but their spelling 2841 // starts with an alphabetical character. 2842 llvm::SmallString<8> SpellingBuf; 2843 StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf); 2844 if (std::isalpha(Spelling[0])) { 2845 Loc = ConsumeToken(); 2846 return &PP.getIdentifierTable().get(Spelling); 2847 } 2848 return 0; 2849 } 2850} 2851 2852/// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently 2853/// only parses standard attributes. 2854/// 2855/// [C++11] attribute-specifier: 2856/// '[' '[' attribute-list ']' ']' 2857/// alignment-specifier 2858/// 2859/// [C++11] attribute-list: 2860/// attribute[opt] 2861/// attribute-list ',' attribute[opt] 2862/// attribute '...' 2863/// attribute-list ',' attribute '...' 2864/// 2865/// [C++11] attribute: 2866/// attribute-token attribute-argument-clause[opt] 2867/// 2868/// [C++11] attribute-token: 2869/// identifier 2870/// attribute-scoped-token 2871/// 2872/// [C++11] attribute-scoped-token: 2873/// attribute-namespace '::' identifier 2874/// 2875/// [C++11] attribute-namespace: 2876/// identifier 2877/// 2878/// [C++11] attribute-argument-clause: 2879/// '(' balanced-token-seq ')' 2880/// 2881/// [C++11] balanced-token-seq: 2882/// balanced-token 2883/// balanced-token-seq balanced-token 2884/// 2885/// [C++11] balanced-token: 2886/// '(' balanced-token-seq ')' 2887/// '[' balanced-token-seq ']' 2888/// '{' balanced-token-seq '}' 2889/// any token but '(', ')', '[', ']', '{', or '}' 2890void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs, 2891 SourceLocation *endLoc) { 2892 if (Tok.is(tok::kw_alignas)) { 2893 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas); 2894 ParseAlignmentSpecifier(attrs, endLoc); 2895 return; 2896 } 2897 2898 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2899 && "Not a C++11 attribute list"); 2900 2901 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute); 2902 2903 ConsumeBracket(); 2904 ConsumeBracket(); 2905 2906 while (Tok.isNot(tok::r_square)) { 2907 // attribute not present 2908 if (Tok.is(tok::comma)) { 2909 ConsumeToken(); 2910 continue; 2911 } 2912 2913 SourceLocation ScopeLoc, AttrLoc; 2914 IdentifierInfo *ScopeName = 0, *AttrName = 0; 2915 2916 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); 2917 if (!AttrName) 2918 // Break out to the "expected ']'" diagnostic. 2919 break; 2920 2921 // scoped attribute 2922 if (Tok.is(tok::coloncolon)) { 2923 ConsumeToken(); 2924 2925 ScopeName = AttrName; 2926 ScopeLoc = AttrLoc; 2927 2928 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); 2929 if (!AttrName) { 2930 Diag(Tok.getLocation(), diag::err_expected_ident); 2931 SkipUntil(tok::r_square, tok::comma, true, true); 2932 continue; 2933 } 2934 } 2935 2936 bool AttrParsed = false; 2937 switch (AttributeList::getKind(AttrName, ScopeName, 2938 AttributeList::AS_CXX11)) { 2939 // No arguments 2940 case AttributeList::AT_CarriesDependency: 2941 // FIXME: implement generic support of attributes with C++11 syntax 2942 // see Parse/ParseDecl.cpp: ParseGNUAttributes 2943 case AttributeList::AT_FallThrough: 2944 case AttributeList::AT_NoReturn: { 2945 if (Tok.is(tok::l_paren)) { 2946 Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments) 2947 << AttrName->getName(); 2948 break; 2949 } 2950 2951 attrs.addNew(AttrName, 2952 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, 2953 AttrLoc), 2954 ScopeName, ScopeLoc, 0, 2955 SourceLocation(), 0, 0, AttributeList::AS_CXX11); 2956 AttrParsed = true; 2957 break; 2958 } 2959 2960 // Silence warnings 2961 default: break; 2962 } 2963 2964 // Skip the entire parameter clause, if any 2965 if (!AttrParsed && Tok.is(tok::l_paren)) { 2966 ConsumeParen(); 2967 // SkipUntil maintains the balancedness of tokens. 2968 SkipUntil(tok::r_paren, false); 2969 } 2970 2971 if (Tok.is(tok::ellipsis)) { 2972 if (AttrParsed) 2973 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis) 2974 << AttrName->getName(); 2975 ConsumeToken(); 2976 } 2977 } 2978 2979 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2980 SkipUntil(tok::r_square, false); 2981 if (endLoc) 2982 *endLoc = Tok.getLocation(); 2983 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2984 SkipUntil(tok::r_square, false); 2985} 2986 2987/// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq. 2988/// 2989/// attribute-specifier-seq: 2990/// attribute-specifier-seq[opt] attribute-specifier 2991void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs, 2992 SourceLocation *endLoc) { 2993 SourceLocation StartLoc = Tok.getLocation(), Loc; 2994 if (!endLoc) 2995 endLoc = &Loc; 2996 2997 do { 2998 ParseCXX11AttributeSpecifier(attrs, endLoc); 2999 } while (isCXX11AttributeSpecifier()); 3000 3001 attrs.Range = SourceRange(StartLoc, *endLoc); 3002} 3003 3004/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 3005/// 3006/// [MS] ms-attribute: 3007/// '[' token-seq ']' 3008/// 3009/// [MS] ms-attribute-seq: 3010/// ms-attribute[opt] 3011/// ms-attribute ms-attribute-seq 3012void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 3013 SourceLocation *endLoc) { 3014 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 3015 3016 while (Tok.is(tok::l_square)) { 3017 // FIXME: If this is actually a C++11 attribute, parse it as one. 3018 ConsumeBracket(); 3019 SkipUntil(tok::r_square, true, true); 3020 if (endLoc) *endLoc = Tok.getLocation(); 3021 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 3022 } 3023} 3024 3025void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 3026 AccessSpecifier& CurAS) { 3027 IfExistsCondition Result; 3028 if (ParseMicrosoftIfExistsCondition(Result)) 3029 return; 3030 3031 BalancedDelimiterTracker Braces(*this, tok::l_brace); 3032 if (Braces.consumeOpen()) { 3033 Diag(Tok, diag::err_expected_lbrace); 3034 return; 3035 } 3036 3037 switch (Result.Behavior) { 3038 case IEB_Parse: 3039 // Parse the declarations below. 3040 break; 3041 3042 case IEB_Dependent: 3043 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists) 3044 << Result.IsIfExists; 3045 // Fall through to skip. 3046 3047 case IEB_Skip: 3048 Braces.skipToEnd(); 3049 return; 3050 } 3051 3052 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 3053 // __if_exists, __if_not_exists can nest. 3054 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 3055 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 3056 continue; 3057 } 3058 3059 // Check for extraneous top-level semicolon. 3060 if (Tok.is(tok::semi)) { 3061 ConsumeExtraSemi(InsideStruct, 3062 DeclSpec::getSpecifierName((DeclSpec::TST)TagType)); 3063 continue; 3064 } 3065 3066 AccessSpecifier AS = getAccessSpecifierIfPresent(); 3067 if (AS != AS_none) { 3068 // Current token is a C++ access specifier. 3069 CurAS = AS; 3070 SourceLocation ASLoc = Tok.getLocation(); 3071 ConsumeToken(); 3072 if (Tok.is(tok::colon)) 3073 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 3074 else 3075 Diag(Tok, diag::err_expected_colon); 3076 ConsumeToken(); 3077 continue; 3078 } 3079 3080 // Parse all the comma separated declarators. 3081 ParseCXXClassMemberDeclaration(CurAS, 0); 3082 } 3083 3084 Braces.consumeClose(); 3085} 3086