ParseDeclCXX.cpp revision 245431
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 "clang/Sema/SemaDiagnostic.h" 22#include "llvm/ADT/SmallString.h" 23#include "RAIIObjectsForParser.h" 24using namespace clang; 25 26/// ParseNamespace - We know that the current token is a namespace keyword. This 27/// may either be a top level namespace or a block-level namespace alias. If 28/// there was an inline keyword, it has already been parsed. 29/// 30/// namespace-definition: [C++ 7.3: basic.namespace] 31/// named-namespace-definition 32/// unnamed-namespace-definition 33/// 34/// unnamed-namespace-definition: 35/// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' 36/// 37/// named-namespace-definition: 38/// original-namespace-definition 39/// extension-namespace-definition 40/// 41/// original-namespace-definition: 42/// 'inline'[opt] 'namespace' identifier attributes[opt] 43/// '{' namespace-body '}' 44/// 45/// extension-namespace-definition: 46/// 'inline'[opt] 'namespace' original-namespace-name 47/// '{' namespace-body '}' 48/// 49/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 50/// 'namespace' identifier '=' qualified-namespace-specifier ';' 51/// 52Decl *Parser::ParseNamespace(unsigned Context, 53 SourceLocation &DeclEnd, 54 SourceLocation InlineLoc) { 55 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 56 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 57 ObjCDeclContextSwitch ObjCDC(*this); 58 59 if (Tok.is(tok::code_completion)) { 60 Actions.CodeCompleteNamespaceDecl(getCurScope()); 61 cutOffParsing(); 62 return 0; 63 } 64 65 SourceLocation IdentLoc; 66 IdentifierInfo *Ident = 0; 67 std::vector<SourceLocation> ExtraIdentLoc; 68 std::vector<IdentifierInfo*> ExtraIdent; 69 std::vector<SourceLocation> ExtraNamespaceLoc; 70 71 Token attrTok; 72 73 if (Tok.is(tok::identifier)) { 74 Ident = Tok.getIdentifierInfo(); 75 IdentLoc = ConsumeToken(); // eat the identifier. 76 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { 77 ExtraNamespaceLoc.push_back(ConsumeToken()); 78 ExtraIdent.push_back(Tok.getIdentifierInfo()); 79 ExtraIdentLoc.push_back(ConsumeToken()); 80 } 81 } 82 83 // Read label attributes, if present. 84 ParsedAttributes attrs(AttrFactory); 85 if (Tok.is(tok::kw___attribute)) { 86 attrTok = Tok; 87 ParseGNUAttributes(attrs); 88 } 89 90 if (Tok.is(tok::equal)) { 91 if (Ident == 0) { 92 Diag(Tok, diag::err_expected_ident); 93 // Skip to end of the definition and eat the ';'. 94 SkipUntil(tok::semi); 95 return 0; 96 } 97 if (!attrs.empty()) 98 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 99 if (InlineLoc.isValid()) 100 Diag(InlineLoc, diag::err_inline_namespace_alias) 101 << FixItHint::CreateRemoval(InlineLoc); 102 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 103 } 104 105 106 BalancedDelimiterTracker T(*this, tok::l_brace); 107 if (T.consumeOpen()) { 108 if (!ExtraIdent.empty()) { 109 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 110 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 111 } 112 Diag(Tok, Ident ? diag::err_expected_lbrace : 113 diag::err_expected_ident_lbrace); 114 return 0; 115 } 116 117 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 118 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 119 getCurScope()->getFnParent()) { 120 if (!ExtraIdent.empty()) { 121 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 122 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 123 } 124 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); 125 SkipUntil(tok::r_brace, false); 126 return 0; 127 } 128 129 if (!ExtraIdent.empty()) { 130 TentativeParsingAction TPA(*this); 131 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 132 Token rBraceToken = Tok; 133 TPA.Revert(); 134 135 if (!rBraceToken.is(tok::r_brace)) { 136 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 137 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 138 } else { 139 std::string NamespaceFix; 140 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 141 E = ExtraIdent.end(); I != E; ++I) { 142 NamespaceFix += " { namespace "; 143 NamespaceFix += (*I)->getName(); 144 } 145 146 std::string RBraces; 147 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 148 RBraces += "} "; 149 150 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 151 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 152 ExtraIdentLoc.back()), 153 NamespaceFix) 154 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 155 } 156 } 157 158 // If we're still good, complain about inline namespaces in non-C++0x now. 159 if (InlineLoc.isValid()) 160 Diag(InlineLoc, getLangOpts().CPlusPlus0x ? 161 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace); 162 163 // Enter a scope for the namespace. 164 ParseScope NamespaceScope(this, Scope::DeclScope); 165 166 Decl *NamespcDecl = 167 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, 168 IdentLoc, Ident, T.getOpenLocation(), 169 attrs.getList()); 170 171 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 172 "parsing namespace"); 173 174 // Parse the contents of the namespace. This includes parsing recovery on 175 // any improperly nested namespaces. 176 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 177 InlineLoc, attrs, T); 178 179 // Leave the namespace scope. 180 NamespaceScope.Exit(); 181 182 DeclEnd = T.getCloseLocation(); 183 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); 184 185 return NamespcDecl; 186} 187 188/// ParseInnerNamespace - Parse the contents of a namespace. 189void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc, 190 std::vector<IdentifierInfo*>& Ident, 191 std::vector<SourceLocation>& NamespaceLoc, 192 unsigned int index, SourceLocation& InlineLoc, 193 ParsedAttributes& attrs, 194 BalancedDelimiterTracker &Tracker) { 195 if (index == Ident.size()) { 196 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 197 ParsedAttributesWithRange attrs(AttrFactory); 198 MaybeParseCXX0XAttributes(attrs); 199 MaybeParseMicrosoftAttributes(attrs); 200 ParseExternalDeclaration(attrs); 201 } 202 203 // The caller is what called check -- we are simply calling 204 // the close for it. 205 Tracker.consumeClose(); 206 207 return; 208 } 209 210 // Parse improperly nested namespaces. 211 ParseScope NamespaceScope(this, Scope::DeclScope); 212 Decl *NamespcDecl = 213 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 214 NamespaceLoc[index], IdentLoc[index], 215 Ident[index], Tracker.getOpenLocation(), 216 attrs.getList()); 217 218 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 219 attrs, Tracker); 220 221 NamespaceScope.Exit(); 222 223 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); 224} 225 226/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 227/// alias definition. 228/// 229Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 230 SourceLocation AliasLoc, 231 IdentifierInfo *Alias, 232 SourceLocation &DeclEnd) { 233 assert(Tok.is(tok::equal) && "Not equal token"); 234 235 ConsumeToken(); // eat the '='. 236 237 if (Tok.is(tok::code_completion)) { 238 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 239 cutOffParsing(); 240 return 0; 241 } 242 243 CXXScopeSpec SS; 244 // Parse (optional) nested-name-specifier. 245 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 246 247 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 248 Diag(Tok, diag::err_expected_namespace_name); 249 // Skip to end of the definition and eat the ';'. 250 SkipUntil(tok::semi); 251 return 0; 252 } 253 254 // Parse identifier. 255 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 256 SourceLocation IdentLoc = ConsumeToken(); 257 258 // Eat the ';'. 259 DeclEnd = Tok.getLocation(); 260 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 261 "", tok::semi); 262 263 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 264 SS, IdentLoc, Ident); 265} 266 267/// ParseLinkage - We know that the current token is a string_literal 268/// and just before that, that extern was seen. 269/// 270/// linkage-specification: [C++ 7.5p2: dcl.link] 271/// 'extern' string-literal '{' declaration-seq[opt] '}' 272/// 'extern' string-literal declaration 273/// 274Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 275 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 276 SmallString<8> LangBuffer; 277 bool Invalid = false; 278 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 279 if (Invalid) 280 return 0; 281 282 // FIXME: This is incorrect: linkage-specifiers are parsed in translation 283 // phase 7, so string-literal concatenation is supposed to occur. 284 // extern "" "C" "" "+" "+" { } is legal. 285 if (Tok.hasUDSuffix()) 286 Diag(Tok, diag::err_invalid_string_udl); 287 SourceLocation Loc = ConsumeStringToken(); 288 289 ParseScope LinkageScope(this, Scope::DeclScope); 290 Decl *LinkageSpec 291 = Actions.ActOnStartLinkageSpecification(getCurScope(), 292 DS.getSourceRange().getBegin(), 293 Loc, Lang, 294 Tok.is(tok::l_brace) ? Tok.getLocation() 295 : SourceLocation()); 296 297 ParsedAttributesWithRange attrs(AttrFactory); 298 MaybeParseCXX0XAttributes(attrs); 299 MaybeParseMicrosoftAttributes(attrs); 300 301 if (Tok.isNot(tok::l_brace)) { 302 // Reset the source range in DS, as the leading "extern" 303 // does not really belong to the inner declaration ... 304 DS.SetRangeStart(SourceLocation()); 305 DS.SetRangeEnd(SourceLocation()); 306 // ... but anyway remember that such an "extern" was seen. 307 DS.setExternInLinkageSpec(true); 308 ParseExternalDeclaration(attrs, &DS); 309 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 310 SourceLocation()); 311 } 312 313 DS.abort(); 314 315 ProhibitAttributes(attrs); 316 317 BalancedDelimiterTracker T(*this, tok::l_brace); 318 T.consumeOpen(); 319 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 320 ParsedAttributesWithRange attrs(AttrFactory); 321 MaybeParseCXX0XAttributes(attrs); 322 MaybeParseMicrosoftAttributes(attrs); 323 ParseExternalDeclaration(attrs); 324 } 325 326 T.consumeClose(); 327 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 328 T.getCloseLocation()); 329} 330 331/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 332/// using-directive. Assumes that current token is 'using'. 333Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 334 const ParsedTemplateInfo &TemplateInfo, 335 SourceLocation &DeclEnd, 336 ParsedAttributesWithRange &attrs, 337 Decl **OwnedType) { 338 assert(Tok.is(tok::kw_using) && "Not using token"); 339 ObjCDeclContextSwitch ObjCDC(*this); 340 341 // Eat 'using'. 342 SourceLocation UsingLoc = ConsumeToken(); 343 344 if (Tok.is(tok::code_completion)) { 345 Actions.CodeCompleteUsing(getCurScope()); 346 cutOffParsing(); 347 return 0; 348 } 349 350 // 'using namespace' means this is a using-directive. 351 if (Tok.is(tok::kw_namespace)) { 352 // Template parameters are always an error here. 353 if (TemplateInfo.Kind) { 354 SourceRange R = TemplateInfo.getSourceRange(); 355 Diag(UsingLoc, diag::err_templated_using_directive) 356 << R << FixItHint::CreateRemoval(R); 357 } 358 359 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 360 } 361 362 // Otherwise, it must be a using-declaration or an alias-declaration. 363 364 // Using declarations can't have attributes. 365 ProhibitAttributes(attrs); 366 367 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 368 AS_none, OwnedType); 369} 370 371/// ParseUsingDirective - Parse C++ using-directive, assumes 372/// that current token is 'namespace' and 'using' was already parsed. 373/// 374/// using-directive: [C++ 7.3.p4: namespace.udir] 375/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 376/// namespace-name ; 377/// [GNU] using-directive: 378/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 379/// namespace-name attributes[opt] ; 380/// 381Decl *Parser::ParseUsingDirective(unsigned Context, 382 SourceLocation UsingLoc, 383 SourceLocation &DeclEnd, 384 ParsedAttributes &attrs) { 385 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 386 387 // Eat 'namespace'. 388 SourceLocation NamespcLoc = ConsumeToken(); 389 390 if (Tok.is(tok::code_completion)) { 391 Actions.CodeCompleteUsingDirective(getCurScope()); 392 cutOffParsing(); 393 return 0; 394 } 395 396 CXXScopeSpec SS; 397 // Parse (optional) nested-name-specifier. 398 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 399 400 IdentifierInfo *NamespcName = 0; 401 SourceLocation IdentLoc = SourceLocation(); 402 403 // Parse namespace-name. 404 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 405 Diag(Tok, diag::err_expected_namespace_name); 406 // If there was invalid namespace name, skip to end of decl, and eat ';'. 407 SkipUntil(tok::semi); 408 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 409 return 0; 410 } 411 412 // Parse identifier. 413 NamespcName = Tok.getIdentifierInfo(); 414 IdentLoc = ConsumeToken(); 415 416 // Parse (optional) attributes (most likely GNU strong-using extension). 417 bool GNUAttr = false; 418 if (Tok.is(tok::kw___attribute)) { 419 GNUAttr = true; 420 ParseGNUAttributes(attrs); 421 } 422 423 // Eat ';'. 424 DeclEnd = Tok.getLocation(); 425 ExpectAndConsume(tok::semi, 426 GNUAttr ? diag::err_expected_semi_after_attribute_list 427 : diag::err_expected_semi_after_namespace_name, 428 "", tok::semi); 429 430 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 431 IdentLoc, NamespcName, attrs.getList()); 432} 433 434/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 435/// Assumes that 'using' was already seen. 436/// 437/// using-declaration: [C++ 7.3.p3: namespace.udecl] 438/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 439/// unqualified-id 440/// 'using' :: unqualified-id 441/// 442/// alias-declaration: C++0x [decl.typedef]p2 443/// 'using' identifier = type-id ; 444/// 445Decl *Parser::ParseUsingDeclaration(unsigned Context, 446 const ParsedTemplateInfo &TemplateInfo, 447 SourceLocation UsingLoc, 448 SourceLocation &DeclEnd, 449 AccessSpecifier AS, 450 Decl **OwnedType) { 451 CXXScopeSpec SS; 452 SourceLocation TypenameLoc; 453 bool IsTypeName; 454 ParsedAttributesWithRange attrs(AttrFactory); 455 456 // FIXME: Simply skip the attributes and diagnose, don't bother parsing them. 457 MaybeParseCXX0XAttributes(attrs); 458 ProhibitAttributes(attrs); 459 attrs.clear(); 460 attrs.Range = SourceRange(); 461 462 // Ignore optional 'typename'. 463 // FIXME: This is wrong; we should parse this as a typename-specifier. 464 if (Tok.is(tok::kw_typename)) { 465 TypenameLoc = Tok.getLocation(); 466 ConsumeToken(); 467 IsTypeName = true; 468 } 469 else 470 IsTypeName = false; 471 472 // Parse nested-name-specifier. 473 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 474 475 // Check nested-name specifier. 476 if (SS.isInvalid()) { 477 SkipUntil(tok::semi); 478 return 0; 479 } 480 481 // Parse the unqualified-id. We allow parsing of both constructor and 482 // destructor names and allow the action module to diagnose any semantic 483 // errors. 484 SourceLocation TemplateKWLoc; 485 UnqualifiedId Name; 486 if (ParseUnqualifiedId(SS, 487 /*EnteringContext=*/false, 488 /*AllowDestructorName=*/true, 489 /*AllowConstructorName=*/true, 490 ParsedType(), 491 TemplateKWLoc, 492 Name)) { 493 SkipUntil(tok::semi); 494 return 0; 495 } 496 497 MaybeParseCXX0XAttributes(attrs); 498 499 // Maybe this is an alias-declaration. 500 bool IsAliasDecl = Tok.is(tok::equal); 501 TypeResult TypeAlias; 502 if (IsAliasDecl) { 503 // TODO: Attribute support. C++0x attributes may appear before the equals. 504 // Where can GNU attributes appear? 505 ConsumeToken(); 506 507 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ? 508 diag::warn_cxx98_compat_alias_declaration : 509 diag::ext_alias_declaration); 510 511 // Type alias templates cannot be specialized. 512 int SpecKind = -1; 513 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 514 Name.getKind() == UnqualifiedId::IK_TemplateId) 515 SpecKind = 0; 516 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 517 SpecKind = 1; 518 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 519 SpecKind = 2; 520 if (SpecKind != -1) { 521 SourceRange Range; 522 if (SpecKind == 0) 523 Range = SourceRange(Name.TemplateId->LAngleLoc, 524 Name.TemplateId->RAngleLoc); 525 else 526 Range = TemplateInfo.getSourceRange(); 527 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 528 << SpecKind << Range; 529 SkipUntil(tok::semi); 530 return 0; 531 } 532 533 // Name must be an identifier. 534 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 535 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 536 // No removal fixit: can't recover from this. 537 SkipUntil(tok::semi); 538 return 0; 539 } else if (IsTypeName) 540 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 541 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 542 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 543 else if (SS.isNotEmpty()) 544 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 545 << FixItHint::CreateRemoval(SS.getRange()); 546 547 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 548 Declarator::AliasTemplateContext : 549 Declarator::AliasDeclContext, AS, OwnedType); 550 } else { 551 // C++11 attributes are not allowed on a using-declaration, but GNU ones 552 // are. 553 ProhibitAttributes(attrs); 554 555 // Parse (optional) attributes (most likely GNU strong-using extension). 556 MaybeParseGNUAttributes(attrs); 557 } 558 559 // Eat ';'. 560 DeclEnd = Tok.getLocation(); 561 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 562 !attrs.empty() ? "attributes list" : 563 IsAliasDecl ? "alias declaration" : "using declaration", 564 tok::semi); 565 566 // Diagnose an attempt to declare a templated using-declaration. 567 // In C++0x, alias-declarations can be templates: 568 // template <...> using id = type; 569 if (TemplateInfo.Kind && !IsAliasDecl) { 570 SourceRange R = TemplateInfo.getSourceRange(); 571 Diag(UsingLoc, diag::err_templated_using_declaration) 572 << R << FixItHint::CreateRemoval(R); 573 574 // Unfortunately, we have to bail out instead of recovering by 575 // ignoring the parameters, just in case the nested name specifier 576 // depends on the parameters. 577 return 0; 578 } 579 580 // "typename" keyword is allowed for identifiers only, 581 // because it may be a type definition. 582 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) { 583 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) 584 << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); 585 // Proceed parsing, but reset the IsTypeName flag. 586 IsTypeName = false; 587 } 588 589 if (IsAliasDecl) { 590 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 591 MultiTemplateParamsArg TemplateParamsArg( 592 TemplateParams ? TemplateParams->data() : 0, 593 TemplateParams ? TemplateParams->size() : 0); 594 // FIXME: Propagate attributes. 595 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 596 UsingLoc, Name, TypeAlias); 597 } 598 599 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 600 Name, attrs.getList(), 601 IsTypeName, TypenameLoc); 602} 603 604/// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration. 605/// 606/// [C++0x] static_assert-declaration: 607/// static_assert ( constant-expression , string-literal ) ; 608/// 609/// [C11] static_assert-declaration: 610/// _Static_assert ( constant-expression , string-literal ) ; 611/// 612Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 613 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 614 "Not a static_assert declaration"); 615 616 if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11) 617 Diag(Tok, diag::ext_c11_static_assert); 618 if (Tok.is(tok::kw_static_assert)) 619 Diag(Tok, diag::warn_cxx98_compat_static_assert); 620 621 SourceLocation StaticAssertLoc = ConsumeToken(); 622 623 BalancedDelimiterTracker T(*this, tok::l_paren); 624 if (T.consumeOpen()) { 625 Diag(Tok, diag::err_expected_lparen); 626 SkipMalformedDecl(); 627 return 0; 628 } 629 630 ExprResult AssertExpr(ParseConstantExpression()); 631 if (AssertExpr.isInvalid()) { 632 SkipMalformedDecl(); 633 return 0; 634 } 635 636 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 637 return 0; 638 639 if (!isTokenStringLiteral()) { 640 Diag(Tok, diag::err_expected_string_literal); 641 SkipMalformedDecl(); 642 return 0; 643 } 644 645 ExprResult AssertMessage(ParseStringLiteralExpression()); 646 if (AssertMessage.isInvalid()) { 647 SkipMalformedDecl(); 648 return 0; 649 } 650 651 T.consumeClose(); 652 653 DeclEnd = Tok.getLocation(); 654 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 655 656 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 657 AssertExpr.take(), 658 AssertMessage.take(), 659 T.getCloseLocation()); 660} 661 662/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 663/// 664/// 'decltype' ( expression ) 665/// 666SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 667 assert((Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) 668 && "Not a decltype specifier"); 669 670 671 ExprResult Result; 672 SourceLocation StartLoc = Tok.getLocation(); 673 SourceLocation EndLoc; 674 675 if (Tok.is(tok::annot_decltype)) { 676 Result = getExprAnnotation(Tok); 677 EndLoc = Tok.getAnnotationEndLoc(); 678 ConsumeToken(); 679 if (Result.isInvalid()) { 680 DS.SetTypeSpecError(); 681 return EndLoc; 682 } 683 } else { 684 if (Tok.getIdentifierInfo()->isStr("decltype")) 685 Diag(Tok, diag::warn_cxx98_compat_decltype); 686 687 ConsumeToken(); 688 689 BalancedDelimiterTracker T(*this, tok::l_paren); 690 if (T.expectAndConsume(diag::err_expected_lparen_after, 691 "decltype", tok::r_paren)) { 692 DS.SetTypeSpecError(); 693 return T.getOpenLocation() == Tok.getLocation() ? 694 StartLoc : T.getOpenLocation(); 695 } 696 697 // Parse the expression 698 699 // C++0x [dcl.type.simple]p4: 700 // The operand of the decltype specifier is an unevaluated operand. 701 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 702 0, /*IsDecltype=*/true); 703 Result = ParseExpression(); 704 if (Result.isInvalid()) { 705 DS.SetTypeSpecError(); 706 if (SkipUntil(tok::r_paren, /*StopAtSemi=*/true, /*DontConsume=*/true)) { 707 EndLoc = ConsumeParen(); 708 } else { 709 if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) { 710 // Backtrack to get the location of the last token before the semi. 711 PP.RevertCachedTokens(2); 712 ConsumeToken(); // the semi. 713 EndLoc = ConsumeAnyToken(); 714 assert(Tok.is(tok::semi)); 715 } else { 716 EndLoc = Tok.getLocation(); 717 } 718 } 719 return EndLoc; 720 } 721 722 // Match the ')' 723 T.consumeClose(); 724 if (T.getCloseLocation().isInvalid()) { 725 DS.SetTypeSpecError(); 726 // FIXME: this should return the location of the last token 727 // that was consumed (by "consumeClose()") 728 return T.getCloseLocation(); 729 } 730 731 Result = Actions.ActOnDecltypeExpression(Result.take()); 732 if (Result.isInvalid()) { 733 DS.SetTypeSpecError(); 734 return T.getCloseLocation(); 735 } 736 737 EndLoc = T.getCloseLocation(); 738 } 739 740 const char *PrevSpec = 0; 741 unsigned DiagID; 742 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 743 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 744 DiagID, Result.release())) { 745 Diag(StartLoc, DiagID) << PrevSpec; 746 DS.SetTypeSpecError(); 747 } 748 return EndLoc; 749} 750 751void Parser::AnnotateExistingDecltypeSpecifier(const DeclSpec& DS, 752 SourceLocation StartLoc, 753 SourceLocation EndLoc) { 754 // make sure we have a token we can turn into an annotation token 755 if (PP.isBacktrackEnabled()) 756 PP.RevertCachedTokens(1); 757 else 758 PP.EnterToken(Tok); 759 760 Tok.setKind(tok::annot_decltype); 761 setExprAnnotation(Tok, DS.getTypeSpecType() == TST_decltype ? 762 DS.getRepAsExpr() : ExprResult()); 763 Tok.setAnnotationEndLoc(EndLoc); 764 Tok.setLocation(StartLoc); 765 PP.AnnotateCachedTokens(Tok); 766} 767 768void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 769 assert(Tok.is(tok::kw___underlying_type) && 770 "Not an underlying type specifier"); 771 772 SourceLocation StartLoc = ConsumeToken(); 773 BalancedDelimiterTracker T(*this, tok::l_paren); 774 if (T.expectAndConsume(diag::err_expected_lparen_after, 775 "__underlying_type", tok::r_paren)) { 776 return; 777 } 778 779 TypeResult Result = ParseTypeName(); 780 if (Result.isInvalid()) { 781 SkipUntil(tok::r_paren); 782 return; 783 } 784 785 // Match the ')' 786 T.consumeClose(); 787 if (T.getCloseLocation().isInvalid()) 788 return; 789 790 const char *PrevSpec = 0; 791 unsigned DiagID; 792 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 793 DiagID, Result.release())) 794 Diag(StartLoc, DiagID) << PrevSpec; 795} 796 797/// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a 798/// class name or decltype-specifier. Note that we only check that the result 799/// names a type; semantic analysis will need to verify that the type names a 800/// class. The result is either a type or null, depending on whether a type 801/// name was found. 802/// 803/// base-type-specifier: [C++ 10.1] 804/// class-or-decltype 805/// class-or-decltype: [C++ 10.1] 806/// nested-name-specifier[opt] class-name 807/// decltype-specifier 808/// class-name: [C++ 9.1] 809/// identifier 810/// simple-template-id 811/// 812Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc, 813 SourceLocation &EndLocation) { 814 // Ignore attempts to use typename 815 if (Tok.is(tok::kw_typename)) { 816 Diag(Tok, diag::err_expected_class_name_not_template) 817 << FixItHint::CreateRemoval(Tok.getLocation()); 818 ConsumeToken(); 819 } 820 821 // Parse optional nested-name-specifier 822 CXXScopeSpec SS; 823 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 824 825 BaseLoc = Tok.getLocation(); 826 827 // Parse decltype-specifier 828 // tok == kw_decltype is just error recovery, it can only happen when SS 829 // isn't empty 830 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) { 831 if (SS.isNotEmpty()) 832 Diag(SS.getBeginLoc(), diag::err_unexpected_scope_on_base_decltype) 833 << FixItHint::CreateRemoval(SS.getRange()); 834 // Fake up a Declarator to use with ActOnTypeName. 835 DeclSpec DS(AttrFactory); 836 837 EndLocation = ParseDecltypeSpecifier(DS); 838 839 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 840 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 841 } 842 843 // Check whether we have a template-id that names a type. 844 if (Tok.is(tok::annot_template_id)) { 845 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 846 if (TemplateId->Kind == TNK_Type_template || 847 TemplateId->Kind == TNK_Dependent_template_name) { 848 AnnotateTemplateIdTokenAsType(); 849 850 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 851 ParsedType Type = getTypeAnnotation(Tok); 852 EndLocation = Tok.getAnnotationEndLoc(); 853 ConsumeToken(); 854 855 if (Type) 856 return Type; 857 return true; 858 } 859 860 // Fall through to produce an error below. 861 } 862 863 if (Tok.isNot(tok::identifier)) { 864 Diag(Tok, diag::err_expected_class_name); 865 return true; 866 } 867 868 IdentifierInfo *Id = Tok.getIdentifierInfo(); 869 SourceLocation IdLoc = ConsumeToken(); 870 871 if (Tok.is(tok::less)) { 872 // It looks the user intended to write a template-id here, but the 873 // template-name was wrong. Try to fix that. 874 TemplateNameKind TNK = TNK_Type_template; 875 TemplateTy Template; 876 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 877 &SS, Template, TNK)) { 878 Diag(IdLoc, diag::err_unknown_template_name) 879 << Id; 880 } 881 882 if (!Template) 883 return true; 884 885 // Form the template name 886 UnqualifiedId TemplateName; 887 TemplateName.setIdentifier(Id, IdLoc); 888 889 // Parse the full template-id, then turn it into a type. 890 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(), 891 TemplateName, true)) 892 return true; 893 if (TNK == TNK_Dependent_template_name) 894 AnnotateTemplateIdTokenAsType(); 895 896 // If we didn't end up with a typename token, there's nothing more we 897 // can do. 898 if (Tok.isNot(tok::annot_typename)) 899 return true; 900 901 // Retrieve the type from the annotation token, consume that token, and 902 // return. 903 EndLocation = Tok.getAnnotationEndLoc(); 904 ParsedType Type = getTypeAnnotation(Tok); 905 ConsumeToken(); 906 return Type; 907 } 908 909 // We have an identifier; check whether it is actually a type. 910 IdentifierInfo *CorrectedII = 0; 911 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 912 false, ParsedType(), 913 /*IsCtorOrDtorName=*/false, 914 /*NonTrivialTypeSourceInfo=*/true, 915 &CorrectedII); 916 if (!Type) { 917 Diag(IdLoc, diag::err_expected_class_name); 918 return true; 919 } 920 921 // Consume the identifier. 922 EndLocation = IdLoc; 923 924 // Fake up a Declarator to use with ActOnTypeName. 925 DeclSpec DS(AttrFactory); 926 DS.SetRangeStart(IdLoc); 927 DS.SetRangeEnd(EndLocation); 928 DS.getTypeSpecScope() = SS; 929 930 const char *PrevSpec = 0; 931 unsigned DiagID; 932 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 933 934 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 935 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 936} 937 938void Parser::ParseMicrosoftInheritanceClassAttributes(ParsedAttributes &attrs) { 939 while (Tok.is(tok::kw___single_inheritance) || 940 Tok.is(tok::kw___multiple_inheritance) || 941 Tok.is(tok::kw___virtual_inheritance)) { 942 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 943 SourceLocation AttrNameLoc = ConsumeToken(); 944 attrs.addNew(AttrName, AttrNameLoc, 0, AttrNameLoc, 0, 945 SourceLocation(), 0, 0, AttributeList::AS_GNU); 946 } 947} 948 949/// Determine whether the following tokens are valid after a type-specifier 950/// which could be a standalone declaration. This will conservatively return 951/// true if there's any doubt, and is appropriate for insert-';' fixits. 952bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) { 953 // This switch enumerates the valid "follow" set for type-specifiers. 954 switch (Tok.getKind()) { 955 default: break; 956 case tok::semi: // struct foo {...} ; 957 case tok::star: // struct foo {...} * P; 958 case tok::amp: // struct foo {...} & R = ... 959 case tok::identifier: // struct foo {...} V ; 960 case tok::r_paren: //(struct foo {...} ) {4} 961 case tok::annot_cxxscope: // struct foo {...} a:: b; 962 case tok::annot_typename: // struct foo {...} a ::b; 963 case tok::annot_template_id: // struct foo {...} a<int> ::b; 964 case tok::l_paren: // struct foo {...} ( x); 965 case tok::comma: // __builtin_offsetof(struct foo{...} , 966 return true; 967 case tok::colon: 968 return CouldBeBitfield; // enum E { ... } : 2; 969 // Type qualifiers 970 case tok::kw_const: // struct foo {...} const x; 971 case tok::kw_volatile: // struct foo {...} volatile x; 972 case tok::kw_restrict: // struct foo {...} restrict x; 973 case tok::kw_inline: // struct foo {...} inline foo() {}; 974 // Storage-class specifiers 975 case tok::kw_static: // struct foo {...} static x; 976 case tok::kw_extern: // struct foo {...} extern x; 977 case tok::kw_typedef: // struct foo {...} typedef x; 978 case tok::kw_register: // struct foo {...} register x; 979 case tok::kw_auto: // struct foo {...} auto x; 980 case tok::kw_mutable: // struct foo {...} mutable x; 981 case tok::kw_constexpr: // struct foo {...} constexpr x; 982 // As shown above, type qualifiers and storage class specifiers absolutely 983 // can occur after class specifiers according to the grammar. However, 984 // almost no one actually writes code like this. If we see one of these, 985 // it is much more likely that someone missed a semi colon and the 986 // type/storage class specifier we're seeing is part of the *next* 987 // intended declaration, as in: 988 // 989 // struct foo { ... } 990 // typedef int X; 991 // 992 // We'd really like to emit a missing semicolon error instead of emitting 993 // an error on the 'int' saying that you can't have two type specifiers in 994 // the same declaration of X. Because of this, we look ahead past this 995 // token to see if it's a type specifier. If so, we know the code is 996 // otherwise invalid, so we can produce the expected semi error. 997 if (!isKnownToBeTypeSpecifier(NextToken())) 998 return true; 999 break; 1000 case tok::r_brace: // struct bar { struct foo {...} } 1001 // Missing ';' at end of struct is accepted as an extension in C mode. 1002 if (!getLangOpts().CPlusPlus) 1003 return true; 1004 break; 1005 } 1006 return false; 1007} 1008 1009/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 1010/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 1011/// until we reach the start of a definition or see a token that 1012/// cannot start a definition. 1013/// 1014/// class-specifier: [C++ class] 1015/// class-head '{' member-specification[opt] '}' 1016/// class-head '{' member-specification[opt] '}' attributes[opt] 1017/// class-head: 1018/// class-key identifier[opt] base-clause[opt] 1019/// class-key nested-name-specifier identifier base-clause[opt] 1020/// class-key nested-name-specifier[opt] simple-template-id 1021/// base-clause[opt] 1022/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 1023/// [GNU] class-key attributes[opt] nested-name-specifier 1024/// identifier base-clause[opt] 1025/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 1026/// simple-template-id base-clause[opt] 1027/// class-key: 1028/// 'class' 1029/// 'struct' 1030/// 'union' 1031/// 1032/// elaborated-type-specifier: [C++ dcl.type.elab] 1033/// class-key ::[opt] nested-name-specifier[opt] identifier 1034/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 1035/// simple-template-id 1036/// 1037/// Note that the C++ class-specifier and elaborated-type-specifier, 1038/// together, subsume the C99 struct-or-union-specifier: 1039/// 1040/// struct-or-union-specifier: [C99 6.7.2.1] 1041/// struct-or-union identifier[opt] '{' struct-contents '}' 1042/// struct-or-union identifier 1043/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 1044/// '}' attributes[opt] 1045/// [GNU] struct-or-union attributes[opt] identifier 1046/// struct-or-union: 1047/// 'struct' 1048/// 'union' 1049void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 1050 SourceLocation StartLoc, DeclSpec &DS, 1051 const ParsedTemplateInfo &TemplateInfo, 1052 AccessSpecifier AS, 1053 bool EnteringContext, DeclSpecContext DSC) { 1054 DeclSpec::TST TagType; 1055 if (TagTokKind == tok::kw_struct) 1056 TagType = DeclSpec::TST_struct; 1057 else if (TagTokKind == tok::kw___interface) 1058 TagType = DeclSpec::TST_interface; 1059 else if (TagTokKind == tok::kw_class) 1060 TagType = DeclSpec::TST_class; 1061 else { 1062 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 1063 TagType = DeclSpec::TST_union; 1064 } 1065 1066 if (Tok.is(tok::code_completion)) { 1067 // Code completion for a struct, class, or union name. 1068 Actions.CodeCompleteTag(getCurScope(), TagType); 1069 return cutOffParsing(); 1070 } 1071 1072 // C++03 [temp.explicit] 14.7.2/8: 1073 // The usual access checking rules do not apply to names used to specify 1074 // explicit instantiations. 1075 // 1076 // As an extension we do not perform access checking on the names used to 1077 // specify explicit specializations either. This is important to allow 1078 // specializing traits classes for private types. 1079 // 1080 // Note that we don't suppress if this turns out to be an elaborated 1081 // type specifier. 1082 bool shouldDelayDiagsInTag = 1083 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 1084 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization); 1085 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag); 1086 1087 ParsedAttributesWithRange attrs(AttrFactory); 1088 // If attributes exist after tag, parse them. 1089 if (Tok.is(tok::kw___attribute)) 1090 ParseGNUAttributes(attrs); 1091 1092 // If declspecs exist after tag, parse them. 1093 while (Tok.is(tok::kw___declspec)) 1094 ParseMicrosoftDeclSpec(attrs); 1095 1096 // Parse inheritance specifiers. 1097 if (Tok.is(tok::kw___single_inheritance) || 1098 Tok.is(tok::kw___multiple_inheritance) || 1099 Tok.is(tok::kw___virtual_inheritance)) 1100 ParseMicrosoftInheritanceClassAttributes(attrs); 1101 1102 // If C++0x attributes exist here, parse them. 1103 // FIXME: Are we consistent with the ordering of parsing of different 1104 // styles of attributes? 1105 MaybeParseCXX0XAttributes(attrs); 1106 1107 if (TagType == DeclSpec::TST_struct && 1108 !Tok.is(tok::identifier) && 1109 Tok.getIdentifierInfo() && 1110 (Tok.is(tok::kw___is_arithmetic) || 1111 Tok.is(tok::kw___is_convertible) || 1112 Tok.is(tok::kw___is_empty) || 1113 Tok.is(tok::kw___is_floating_point) || 1114 Tok.is(tok::kw___is_function) || 1115 Tok.is(tok::kw___is_fundamental) || 1116 Tok.is(tok::kw___is_integral) || 1117 Tok.is(tok::kw___is_member_function_pointer) || 1118 Tok.is(tok::kw___is_member_pointer) || 1119 Tok.is(tok::kw___is_pod) || 1120 Tok.is(tok::kw___is_pointer) || 1121 Tok.is(tok::kw___is_same) || 1122 Tok.is(tok::kw___is_scalar) || 1123 Tok.is(tok::kw___is_signed) || 1124 Tok.is(tok::kw___is_unsigned) || 1125 Tok.is(tok::kw___is_void))) { 1126 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 1127 // name of struct templates, but some are keywords in GCC >= 4.3 1128 // and Clang. Therefore, when we see the token sequence "struct 1129 // X", make X into a normal identifier rather than a keyword, to 1130 // allow libstdc++ 4.2 and libc++ to work properly. 1131 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 1132 Tok.setKind(tok::identifier); 1133 } 1134 1135 // Parse the (optional) nested-name-specifier. 1136 CXXScopeSpec &SS = DS.getTypeSpecScope(); 1137 if (getLangOpts().CPlusPlus) { 1138 // "FOO : BAR" is not a potential typo for "FOO::BAR". 1139 ColonProtectionRAIIObject X(*this); 1140 1141 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext)) 1142 DS.SetTypeSpecError(); 1143 if (SS.isSet()) 1144 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 1145 Diag(Tok, diag::err_expected_ident); 1146 } 1147 1148 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 1149 1150 // Parse the (optional) class name or simple-template-id. 1151 IdentifierInfo *Name = 0; 1152 SourceLocation NameLoc; 1153 TemplateIdAnnotation *TemplateId = 0; 1154 if (Tok.is(tok::identifier)) { 1155 Name = Tok.getIdentifierInfo(); 1156 NameLoc = ConsumeToken(); 1157 1158 if (Tok.is(tok::less) && getLangOpts().CPlusPlus) { 1159 // The name was supposed to refer to a template, but didn't. 1160 // Eat the template argument list and try to continue parsing this as 1161 // a class (or template thereof). 1162 TemplateArgList TemplateArgs; 1163 SourceLocation LAngleLoc, RAngleLoc; 1164 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 1165 true, LAngleLoc, 1166 TemplateArgs, RAngleLoc)) { 1167 // We couldn't parse the template argument list at all, so don't 1168 // try to give any location information for the list. 1169 LAngleLoc = RAngleLoc = SourceLocation(); 1170 } 1171 1172 Diag(NameLoc, diag::err_explicit_spec_non_template) 1173 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 1174 << (TagType == DeclSpec::TST_class? 0 1175 : TagType == DeclSpec::TST_struct? 1 1176 : TagType == DeclSpec::TST_interface? 2 1177 : 3) 1178 << Name 1179 << SourceRange(LAngleLoc, RAngleLoc); 1180 1181 // Strip off the last template parameter list if it was empty, since 1182 // we've removed its template argument list. 1183 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 1184 if (TemplateParams && TemplateParams->size() > 1) { 1185 TemplateParams->pop_back(); 1186 } else { 1187 TemplateParams = 0; 1188 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 1189 = ParsedTemplateInfo::NonTemplate; 1190 } 1191 } else if (TemplateInfo.Kind 1192 == ParsedTemplateInfo::ExplicitInstantiation) { 1193 // Pretend this is just a forward declaration. 1194 TemplateParams = 0; 1195 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 1196 = ParsedTemplateInfo::NonTemplate; 1197 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 1198 = SourceLocation(); 1199 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 1200 = SourceLocation(); 1201 } 1202 } 1203 } else if (Tok.is(tok::annot_template_id)) { 1204 TemplateId = takeTemplateIdAnnotation(Tok); 1205 NameLoc = ConsumeToken(); 1206 1207 if (TemplateId->Kind != TNK_Type_template && 1208 TemplateId->Kind != TNK_Dependent_template_name) { 1209 // The template-name in the simple-template-id refers to 1210 // something other than a class template. Give an appropriate 1211 // error message and skip to the ';'. 1212 SourceRange Range(NameLoc); 1213 if (SS.isNotEmpty()) 1214 Range.setBegin(SS.getBeginLoc()); 1215 1216 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 1217 << Name << static_cast<int>(TemplateId->Kind) << Range; 1218 1219 DS.SetTypeSpecError(); 1220 SkipUntil(tok::semi, false, true); 1221 return; 1222 } 1223 } 1224 1225 // There are four options here. 1226 // - If we are in a trailing return type, this is always just a reference, 1227 // and we must not try to parse a definition. For instance, 1228 // [] () -> struct S { }; 1229 // does not define a type. 1230 // - If we have 'struct foo {...', 'struct foo :...', 1231 // 'struct foo final :' or 'struct foo final {', then this is a definition. 1232 // - If we have 'struct foo;', then this is either a forward declaration 1233 // or a friend declaration, which have to be treated differently. 1234 // - Otherwise we have something like 'struct foo xyz', a reference. 1235 // However, in type-specifier-seq's, things look like declarations but are 1236 // just references, e.g. 1237 // new struct s; 1238 // or 1239 // &T::operator struct s; 1240 // For these, DSC is DSC_type_specifier. 1241 Sema::TagUseKind TUK; 1242 if (DSC == DSC_trailing) 1243 TUK = Sema::TUK_Reference; 1244 else if (Tok.is(tok::l_brace) || 1245 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || 1246 (isCXX0XFinalKeyword() && 1247 (NextToken().is(tok::l_brace) || NextToken().is(tok::colon)))) { 1248 if (DS.isFriendSpecified()) { 1249 // C++ [class.friend]p2: 1250 // A class shall not be defined in a friend declaration. 1251 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type) 1252 << SourceRange(DS.getFriendSpecLoc()); 1253 1254 // Skip everything up to the semicolon, so that this looks like a proper 1255 // friend class (or template thereof) declaration. 1256 SkipUntil(tok::semi, true, true); 1257 TUK = Sema::TUK_Friend; 1258 } else { 1259 // Okay, this is a class definition. 1260 TUK = Sema::TUK_Definition; 1261 } 1262 } else if (DSC != DSC_type_specifier && 1263 (Tok.is(tok::semi) || 1264 (Tok.isAtStartOfLine() && !isValidAfterTypeSpecifier(false)))) { 1265 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1266 if (Tok.isNot(tok::semi)) { 1267 // A semicolon was missing after this declaration. Diagnose and recover. 1268 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1269 DeclSpec::getSpecifierName(TagType)); 1270 PP.EnterToken(Tok); 1271 Tok.setKind(tok::semi); 1272 } 1273 } else 1274 TUK = Sema::TUK_Reference; 1275 1276 // If this is an elaborated type specifier, and we delayed 1277 // diagnostics before, just merge them into the current pool. 1278 if (shouldDelayDiagsInTag) { 1279 diagsFromTag.done(); 1280 if (TUK == Sema::TUK_Reference) 1281 diagsFromTag.redelay(); 1282 } 1283 1284 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1285 TUK != Sema::TUK_Definition)) { 1286 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1287 // We have a declaration or reference to an anonymous class. 1288 Diag(StartLoc, diag::err_anon_type_definition) 1289 << DeclSpec::getSpecifierName(TagType); 1290 } 1291 1292 SkipUntil(tok::comma, true); 1293 return; 1294 } 1295 1296 // Create the tag portion of the class or class template. 1297 DeclResult TagOrTempResult = true; // invalid 1298 TypeResult TypeResult = true; // invalid 1299 1300 bool Owned = false; 1301 if (TemplateId) { 1302 // Explicit specialization, class template partial specialization, 1303 // or explicit instantiation. 1304 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), 1305 TemplateId->NumArgs); 1306 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1307 TUK == Sema::TUK_Declaration) { 1308 // This is an explicit instantiation of a class template. 1309 ProhibitAttributes(attrs); 1310 1311 TagOrTempResult 1312 = Actions.ActOnExplicitInstantiation(getCurScope(), 1313 TemplateInfo.ExternLoc, 1314 TemplateInfo.TemplateLoc, 1315 TagType, 1316 StartLoc, 1317 SS, 1318 TemplateId->Template, 1319 TemplateId->TemplateNameLoc, 1320 TemplateId->LAngleLoc, 1321 TemplateArgsPtr, 1322 TemplateId->RAngleLoc, 1323 attrs.getList()); 1324 1325 // Friend template-ids are treated as references unless 1326 // they have template headers, in which case they're ill-formed 1327 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1328 // We diagnose this error in ActOnClassTemplateSpecialization. 1329 } else if (TUK == Sema::TUK_Reference || 1330 (TUK == Sema::TUK_Friend && 1331 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1332 ProhibitAttributes(attrs); 1333 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, StartLoc, 1334 TemplateId->SS, 1335 TemplateId->TemplateKWLoc, 1336 TemplateId->Template, 1337 TemplateId->TemplateNameLoc, 1338 TemplateId->LAngleLoc, 1339 TemplateArgsPtr, 1340 TemplateId->RAngleLoc); 1341 } else { 1342 // This is an explicit specialization or a class template 1343 // partial specialization. 1344 TemplateParameterLists FakedParamLists; 1345 1346 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1347 // This looks like an explicit instantiation, because we have 1348 // something like 1349 // 1350 // template class Foo<X> 1351 // 1352 // but it actually has a definition. Most likely, this was 1353 // meant to be an explicit specialization, but the user forgot 1354 // the '<>' after 'template'. 1355 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1356 1357 SourceLocation LAngleLoc 1358 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1359 Diag(TemplateId->TemplateNameLoc, 1360 diag::err_explicit_instantiation_with_definition) 1361 << SourceRange(TemplateInfo.TemplateLoc) 1362 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1363 1364 // Create a fake template parameter list that contains only 1365 // "template<>", so that we treat this construct as a class 1366 // template specialization. 1367 FakedParamLists.push_back( 1368 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1369 TemplateInfo.TemplateLoc, 1370 LAngleLoc, 1371 0, 0, 1372 LAngleLoc)); 1373 TemplateParams = &FakedParamLists; 1374 } 1375 1376 // Build the class template specialization. 1377 TagOrTempResult 1378 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1379 StartLoc, DS.getModulePrivateSpecLoc(), SS, 1380 TemplateId->Template, 1381 TemplateId->TemplateNameLoc, 1382 TemplateId->LAngleLoc, 1383 TemplateArgsPtr, 1384 TemplateId->RAngleLoc, 1385 attrs.getList(), 1386 MultiTemplateParamsArg( 1387 TemplateParams? &(*TemplateParams)[0] : 0, 1388 TemplateParams? TemplateParams->size() : 0)); 1389 } 1390 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1391 TUK == Sema::TUK_Declaration) { 1392 // Explicit instantiation of a member of a class template 1393 // specialization, e.g., 1394 // 1395 // template struct Outer<int>::Inner; 1396 // 1397 ProhibitAttributes(attrs); 1398 1399 TagOrTempResult 1400 = Actions.ActOnExplicitInstantiation(getCurScope(), 1401 TemplateInfo.ExternLoc, 1402 TemplateInfo.TemplateLoc, 1403 TagType, StartLoc, SS, Name, 1404 NameLoc, attrs.getList()); 1405 } else if (TUK == Sema::TUK_Friend && 1406 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1407 ProhibitAttributes(attrs); 1408 1409 TagOrTempResult = 1410 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1411 TagType, StartLoc, SS, 1412 Name, NameLoc, attrs.getList(), 1413 MultiTemplateParamsArg( 1414 TemplateParams? &(*TemplateParams)[0] : 0, 1415 TemplateParams? TemplateParams->size() : 0)); 1416 } else { 1417 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1418 TUK == Sema::TUK_Definition) { 1419 // FIXME: Diagnose this particular error. 1420 } 1421 1422 if (TUK != Sema::TUK_Declaration && TUK != Sema::TUK_Definition) 1423 ProhibitAttributes(attrs); 1424 1425 bool IsDependent = false; 1426 1427 // Don't pass down template parameter lists if this is just a tag 1428 // reference. For example, we don't need the template parameters here: 1429 // template <class T> class A *makeA(T t); 1430 MultiTemplateParamsArg TParams; 1431 if (TUK != Sema::TUK_Reference && TemplateParams) 1432 TParams = 1433 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1434 1435 // Declaration or definition of a class type 1436 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1437 SS, Name, NameLoc, attrs.getList(), AS, 1438 DS.getModulePrivateSpecLoc(), 1439 TParams, Owned, IsDependent, 1440 SourceLocation(), false, 1441 clang::TypeResult()); 1442 1443 // If ActOnTag said the type was dependent, try again with the 1444 // less common call. 1445 if (IsDependent) { 1446 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1447 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1448 SS, Name, StartLoc, NameLoc); 1449 } 1450 } 1451 1452 // If there is a body, parse it and inform the actions module. 1453 if (TUK == Sema::TUK_Definition) { 1454 assert(Tok.is(tok::l_brace) || 1455 (getLangOpts().CPlusPlus && Tok.is(tok::colon)) || 1456 isCXX0XFinalKeyword()); 1457 if (getLangOpts().CPlusPlus) 1458 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1459 else 1460 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1461 } 1462 1463 const char *PrevSpec = 0; 1464 unsigned DiagID; 1465 bool Result; 1466 if (!TypeResult.isInvalid()) { 1467 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1468 NameLoc.isValid() ? NameLoc : StartLoc, 1469 PrevSpec, DiagID, TypeResult.get()); 1470 } else if (!TagOrTempResult.isInvalid()) { 1471 Result = DS.SetTypeSpecType(TagType, StartLoc, 1472 NameLoc.isValid() ? NameLoc : StartLoc, 1473 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1474 } else { 1475 DS.SetTypeSpecError(); 1476 return; 1477 } 1478 1479 if (Result) 1480 Diag(StartLoc, DiagID) << PrevSpec; 1481 1482 // At this point, we've successfully parsed a class-specifier in 'definition' 1483 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1484 // going to look at what comes after it to improve error recovery. If an 1485 // impossible token occurs next, we assume that the programmer forgot a ; at 1486 // the end of the declaration and recover that way. 1487 // 1488 // Also enforce C++ [temp]p3: 1489 // In a template-declaration which defines a class, no declarator 1490 // is permitted. 1491 if (TUK == Sema::TUK_Definition && 1492 (TemplateInfo.Kind || !isValidAfterTypeSpecifier(false))) { 1493 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1494 DeclSpec::getSpecifierName(TagType)); 1495 // Push this token back into the preprocessor and change our current token 1496 // to ';' so that the rest of the code recovers as though there were an 1497 // ';' after the definition. 1498 PP.EnterToken(Tok); 1499 Tok.setKind(tok::semi); 1500 } 1501} 1502 1503/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1504/// 1505/// base-clause : [C++ class.derived] 1506/// ':' base-specifier-list 1507/// base-specifier-list: 1508/// base-specifier '...'[opt] 1509/// base-specifier-list ',' base-specifier '...'[opt] 1510void Parser::ParseBaseClause(Decl *ClassDecl) { 1511 assert(Tok.is(tok::colon) && "Not a base clause"); 1512 ConsumeToken(); 1513 1514 // Build up an array of parsed base specifiers. 1515 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1516 1517 while (true) { 1518 // Parse a base-specifier. 1519 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1520 if (Result.isInvalid()) { 1521 // Skip the rest of this base specifier, up until the comma or 1522 // opening brace. 1523 SkipUntil(tok::comma, tok::l_brace, true, true); 1524 } else { 1525 // Add this to our array of base specifiers. 1526 BaseInfo.push_back(Result.get()); 1527 } 1528 1529 // If the next token is a comma, consume it and keep reading 1530 // base-specifiers. 1531 if (Tok.isNot(tok::comma)) break; 1532 1533 // Consume the comma. 1534 ConsumeToken(); 1535 } 1536 1537 // Attach the base specifiers 1538 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1539} 1540 1541/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1542/// one entry in the base class list of a class specifier, for example: 1543/// class foo : public bar, virtual private baz { 1544/// 'public bar' and 'virtual private baz' are each base-specifiers. 1545/// 1546/// base-specifier: [C++ class.derived] 1547/// ::[opt] nested-name-specifier[opt] class-name 1548/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1549/// base-type-specifier 1550/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1551/// base-type-specifier 1552Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1553 bool IsVirtual = false; 1554 SourceLocation StartLoc = Tok.getLocation(); 1555 1556 // Parse the 'virtual' keyword. 1557 if (Tok.is(tok::kw_virtual)) { 1558 ConsumeToken(); 1559 IsVirtual = true; 1560 } 1561 1562 // Parse an (optional) access specifier. 1563 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1564 if (Access != AS_none) 1565 ConsumeToken(); 1566 1567 // Parse the 'virtual' keyword (again!), in case it came after the 1568 // access specifier. 1569 if (Tok.is(tok::kw_virtual)) { 1570 SourceLocation VirtualLoc = ConsumeToken(); 1571 if (IsVirtual) { 1572 // Complain about duplicate 'virtual' 1573 Diag(VirtualLoc, diag::err_dup_virtual) 1574 << FixItHint::CreateRemoval(VirtualLoc); 1575 } 1576 1577 IsVirtual = true; 1578 } 1579 1580 // Parse the class-name. 1581 SourceLocation EndLocation; 1582 SourceLocation BaseLoc; 1583 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation); 1584 if (BaseType.isInvalid()) 1585 return true; 1586 1587 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1588 // actually part of the base-specifier-list grammar productions, but we 1589 // parse it here for convenience. 1590 SourceLocation EllipsisLoc; 1591 if (Tok.is(tok::ellipsis)) 1592 EllipsisLoc = ConsumeToken(); 1593 1594 // Find the complete source range for the base-specifier. 1595 SourceRange Range(StartLoc, EndLocation); 1596 1597 // Notify semantic analysis that we have parsed a complete 1598 // base-specifier. 1599 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1600 BaseType.get(), BaseLoc, EllipsisLoc); 1601} 1602 1603/// getAccessSpecifierIfPresent - Determine whether the next token is 1604/// a C++ access-specifier. 1605/// 1606/// access-specifier: [C++ class.derived] 1607/// 'private' 1608/// 'protected' 1609/// 'public' 1610AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1611 switch (Tok.getKind()) { 1612 default: return AS_none; 1613 case tok::kw_private: return AS_private; 1614 case tok::kw_protected: return AS_protected; 1615 case tok::kw_public: return AS_public; 1616 } 1617} 1618 1619/// \brief If the given declarator has any parts for which parsing has to be 1620/// delayed, e.g., default arguments, create a late-parsed method declaration 1621/// record to handle the parsing at the end of the class definition. 1622void Parser::HandleMemberFunctionDeclDelays(Declarator& DeclaratorInfo, 1623 Decl *ThisDecl) { 1624 // We just declared a member function. If this member function 1625 // has any default arguments, we'll need to parse them later. 1626 LateParsedMethodDeclaration *LateMethod = 0; 1627 DeclaratorChunk::FunctionTypeInfo &FTI 1628 = DeclaratorInfo.getFunctionTypeInfo(); 1629 1630 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1631 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1632 if (!LateMethod) { 1633 // Push this method onto the stack of late-parsed method 1634 // declarations. 1635 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1636 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1637 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1638 1639 // Add all of the parameters prior to this one (they don't 1640 // have default arguments). 1641 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1642 for (unsigned I = 0; I < ParamIdx; ++I) 1643 LateMethod->DefaultArgs.push_back( 1644 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1645 } 1646 1647 // Add this parameter to the list of parameters (it may or may 1648 // not have a default argument). 1649 LateMethod->DefaultArgs.push_back( 1650 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1651 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1652 } 1653 } 1654} 1655 1656/// isCXX0XVirtSpecifier - Determine whether the given token is a C++0x 1657/// virt-specifier. 1658/// 1659/// virt-specifier: 1660/// override 1661/// final 1662VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier(const Token &Tok) const { 1663 if (!getLangOpts().CPlusPlus) 1664 return VirtSpecifiers::VS_None; 1665 1666 if (Tok.is(tok::identifier)) { 1667 IdentifierInfo *II = Tok.getIdentifierInfo(); 1668 1669 // Initialize the contextual keywords. 1670 if (!Ident_final) { 1671 Ident_final = &PP.getIdentifierTable().get("final"); 1672 Ident_override = &PP.getIdentifierTable().get("override"); 1673 } 1674 1675 if (II == Ident_override) 1676 return VirtSpecifiers::VS_Override; 1677 1678 if (II == Ident_final) 1679 return VirtSpecifiers::VS_Final; 1680 } 1681 1682 return VirtSpecifiers::VS_None; 1683} 1684 1685/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1686/// 1687/// virt-specifier-seq: 1688/// virt-specifier 1689/// virt-specifier-seq virt-specifier 1690void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS, 1691 bool IsInterface) { 1692 while (true) { 1693 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1694 if (Specifier == VirtSpecifiers::VS_None) 1695 return; 1696 1697 // C++ [class.mem]p8: 1698 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1699 const char *PrevSpec = 0; 1700 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1701 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1702 << PrevSpec 1703 << FixItHint::CreateRemoval(Tok.getLocation()); 1704 1705 if (IsInterface && Specifier == VirtSpecifiers::VS_Final) { 1706 Diag(Tok.getLocation(), diag::err_override_control_interface) 1707 << VirtSpecifiers::getSpecifierName(Specifier); 1708 } else { 1709 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ? 1710 diag::warn_cxx98_compat_override_control_keyword : 1711 diag::ext_override_control_keyword) 1712 << VirtSpecifiers::getSpecifierName(Specifier); 1713 } 1714 ConsumeToken(); 1715 } 1716} 1717 1718/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1719/// contextual 'final' keyword. 1720bool Parser::isCXX0XFinalKeyword() const { 1721 if (!getLangOpts().CPlusPlus) 1722 return false; 1723 1724 if (!Tok.is(tok::identifier)) 1725 return false; 1726 1727 // Initialize the contextual keywords. 1728 if (!Ident_final) { 1729 Ident_final = &PP.getIdentifierTable().get("final"); 1730 Ident_override = &PP.getIdentifierTable().get("override"); 1731 } 1732 1733 return Tok.getIdentifierInfo() == Ident_final; 1734} 1735 1736/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1737/// 1738/// member-declaration: 1739/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1740/// function-definition ';'[opt] 1741/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1742/// using-declaration [TODO] 1743/// [C++0x] static_assert-declaration 1744/// template-declaration 1745/// [GNU] '__extension__' member-declaration 1746/// 1747/// member-declarator-list: 1748/// member-declarator 1749/// member-declarator-list ',' member-declarator 1750/// 1751/// member-declarator: 1752/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1753/// declarator constant-initializer[opt] 1754/// [C++11] declarator brace-or-equal-initializer[opt] 1755/// identifier[opt] ':' constant-expression 1756/// 1757/// virt-specifier-seq: 1758/// virt-specifier 1759/// virt-specifier-seq virt-specifier 1760/// 1761/// virt-specifier: 1762/// override 1763/// final 1764/// 1765/// pure-specifier: 1766/// '= 0' 1767/// 1768/// constant-initializer: 1769/// '=' constant-expression 1770/// 1771void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1772 AttributeList *AccessAttrs, 1773 const ParsedTemplateInfo &TemplateInfo, 1774 ParsingDeclRAIIObject *TemplateDiags) { 1775 if (Tok.is(tok::at)) { 1776 if (getLangOpts().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1777 Diag(Tok, diag::err_at_defs_cxx); 1778 else 1779 Diag(Tok, diag::err_at_in_class); 1780 1781 ConsumeToken(); 1782 SkipUntil(tok::r_brace); 1783 return; 1784 } 1785 1786 // Access declarations. 1787 bool MalformedTypeSpec = false; 1788 if (!TemplateInfo.Kind && 1789 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon))) { 1790 if (TryAnnotateCXXScopeToken()) 1791 MalformedTypeSpec = true; 1792 1793 bool isAccessDecl; 1794 if (Tok.isNot(tok::annot_cxxscope)) 1795 isAccessDecl = false; 1796 else if (NextToken().is(tok::identifier)) 1797 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1798 else 1799 isAccessDecl = NextToken().is(tok::kw_operator); 1800 1801 if (isAccessDecl) { 1802 // Collect the scope specifier token we annotated earlier. 1803 CXXScopeSpec SS; 1804 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1805 /*EnteringContext=*/false); 1806 1807 // Try to parse an unqualified-id. 1808 SourceLocation TemplateKWLoc; 1809 UnqualifiedId Name; 1810 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), 1811 TemplateKWLoc, Name)) { 1812 SkipUntil(tok::semi); 1813 return; 1814 } 1815 1816 // TODO: recover from mistakenly-qualified operator declarations. 1817 if (ExpectAndConsume(tok::semi, 1818 diag::err_expected_semi_after, 1819 "access declaration", 1820 tok::semi)) 1821 return; 1822 1823 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1824 false, SourceLocation(), 1825 SS, Name, 1826 /* AttrList */ 0, 1827 /* IsTypeName */ false, 1828 SourceLocation()); 1829 return; 1830 } 1831 } 1832 1833 // static_assert-declaration 1834 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1835 // FIXME: Check for templates 1836 SourceLocation DeclEnd; 1837 ParseStaticAssertDeclaration(DeclEnd); 1838 return; 1839 } 1840 1841 if (Tok.is(tok::kw_template)) { 1842 assert(!TemplateInfo.TemplateParams && 1843 "Nested template improperly parsed?"); 1844 SourceLocation DeclEnd; 1845 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1846 AS, AccessAttrs); 1847 return; 1848 } 1849 1850 // Handle: member-declaration ::= '__extension__' member-declaration 1851 if (Tok.is(tok::kw___extension__)) { 1852 // __extension__ silences extension warnings in the subexpression. 1853 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1854 ConsumeToken(); 1855 return ParseCXXClassMemberDeclaration(AS, AccessAttrs, 1856 TemplateInfo, TemplateDiags); 1857 } 1858 1859 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1860 // is a bitfield. 1861 ColonProtectionRAIIObject X(*this); 1862 1863 ParsedAttributesWithRange attrs(AttrFactory); 1864 // Optional C++0x attribute-specifier 1865 MaybeParseCXX0XAttributes(attrs); 1866 MaybeParseMicrosoftAttributes(attrs); 1867 1868 if (Tok.is(tok::kw_using)) { 1869 ProhibitAttributes(attrs); 1870 1871 // Eat 'using'. 1872 SourceLocation UsingLoc = ConsumeToken(); 1873 1874 if (Tok.is(tok::kw_namespace)) { 1875 Diag(UsingLoc, diag::err_using_namespace_in_class); 1876 SkipUntil(tok::semi, true, true); 1877 } else { 1878 SourceLocation DeclEnd; 1879 // Otherwise, it must be a using-declaration or an alias-declaration. 1880 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1881 UsingLoc, DeclEnd, AS); 1882 } 1883 return; 1884 } 1885 1886 // Hold late-parsed attributes so we can attach a Decl to them later. 1887 LateParsedAttrList CommonLateParsedAttrs; 1888 1889 // decl-specifier-seq: 1890 // Parse the common declaration-specifiers piece. 1891 ParsingDeclSpec DS(*this, TemplateDiags); 1892 DS.takeAttributesFrom(attrs); 1893 if (MalformedTypeSpec) 1894 DS.SetTypeSpecError(); 1895 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class, 1896 &CommonLateParsedAttrs); 1897 1898 MultiTemplateParamsArg TemplateParams( 1899 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1900 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1901 1902 if (Tok.is(tok::semi)) { 1903 ConsumeToken(); 1904 Decl *TheDecl = 1905 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1906 DS.complete(TheDecl); 1907 return; 1908 } 1909 1910 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1911 VirtSpecifiers VS; 1912 1913 // Hold late-parsed attributes so we can attach a Decl to them later. 1914 LateParsedAttrList LateParsedAttrs; 1915 1916 SourceLocation EqualLoc; 1917 bool HasInitializer = false; 1918 ExprResult Init; 1919 if (Tok.isNot(tok::colon)) { 1920 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1921 ColonProtectionRAIIObject X(*this); 1922 1923 // Parse the first declarator. 1924 ParseDeclarator(DeclaratorInfo); 1925 // Error parsing the declarator? 1926 if (!DeclaratorInfo.hasName()) { 1927 // If so, skip until the semi-colon or a }. 1928 SkipUntil(tok::r_brace, true, true); 1929 if (Tok.is(tok::semi)) 1930 ConsumeToken(); 1931 return; 1932 } 1933 1934 ParseOptionalCXX0XVirtSpecifierSeq(VS, getCurrentClass().IsInterface); 1935 1936 // If attributes exist after the declarator, but before an '{', parse them. 1937 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1938 1939 // MSVC permits pure specifier on inline functions declared at class scope. 1940 // Hence check for =0 before checking for function definition. 1941 if (getLangOpts().MicrosoftExt && Tok.is(tok::equal) && 1942 DeclaratorInfo.isFunctionDeclarator() && 1943 NextToken().is(tok::numeric_constant)) { 1944 EqualLoc = ConsumeToken(); 1945 Init = ParseInitializer(); 1946 if (Init.isInvalid()) 1947 SkipUntil(tok::comma, true, true); 1948 else 1949 HasInitializer = true; 1950 } 1951 1952 FunctionDefinitionKind DefinitionKind = FDK_Declaration; 1953 // function-definition: 1954 // 1955 // In C++11, a non-function declarator followed by an open brace is a 1956 // braced-init-list for an in-class member initialization, not an 1957 // erroneous function definition. 1958 if (Tok.is(tok::l_brace) && !getLangOpts().CPlusPlus0x) { 1959 DefinitionKind = FDK_Definition; 1960 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1961 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1962 DefinitionKind = FDK_Definition; 1963 } else if (Tok.is(tok::equal)) { 1964 const Token &KW = NextToken(); 1965 if (KW.is(tok::kw_default)) 1966 DefinitionKind = FDK_Defaulted; 1967 else if (KW.is(tok::kw_delete)) 1968 DefinitionKind = FDK_Deleted; 1969 } 1970 } 1971 1972 if (DefinitionKind) { 1973 if (!DeclaratorInfo.isFunctionDeclarator()) { 1974 Diag(DeclaratorInfo.getIdentifierLoc(), diag::err_func_def_no_params); 1975 ConsumeBrace(); 1976 SkipUntil(tok::r_brace, /*StopAtSemi*/false); 1977 1978 // Consume the optional ';' 1979 if (Tok.is(tok::semi)) 1980 ConsumeToken(); 1981 return; 1982 } 1983 1984 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1985 Diag(DeclaratorInfo.getIdentifierLoc(), 1986 diag::err_function_declared_typedef); 1987 // This recovery skips the entire function body. It would be nice 1988 // to simply call ParseCXXInlineMethodDef() below, however Sema 1989 // assumes the declarator represents a function, not a typedef. 1990 ConsumeBrace(); 1991 SkipUntil(tok::r_brace, /*StopAtSemi*/false); 1992 1993 // Consume the optional ';' 1994 if (Tok.is(tok::semi)) 1995 ConsumeToken(); 1996 return; 1997 } 1998 1999 Decl *FunDecl = 2000 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo, 2001 VS, DefinitionKind, Init); 2002 2003 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) { 2004 CommonLateParsedAttrs[i]->addDecl(FunDecl); 2005 } 2006 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 2007 LateParsedAttrs[i]->addDecl(FunDecl); 2008 } 2009 LateParsedAttrs.clear(); 2010 2011 // Consume the ';' - it's optional unless we have a delete or default 2012 if (Tok.is(tok::semi)) 2013 ConsumeExtraSemi(AfterMemberFunctionDefinition); 2014 2015 return; 2016 } 2017 } 2018 2019 // member-declarator-list: 2020 // member-declarator 2021 // member-declarator-list ',' member-declarator 2022 2023 SmallVector<Decl *, 8> DeclsInGroup; 2024 ExprResult BitfieldSize; 2025 bool ExpectSemi = true; 2026 2027 while (1) { 2028 // member-declarator: 2029 // declarator pure-specifier[opt] 2030 // declarator brace-or-equal-initializer[opt] 2031 // identifier[opt] ':' constant-expression 2032 if (Tok.is(tok::colon)) { 2033 ConsumeToken(); 2034 BitfieldSize = ParseConstantExpression(); 2035 if (BitfieldSize.isInvalid()) 2036 SkipUntil(tok::comma, true, true); 2037 } 2038 2039 // If a simple-asm-expr is present, parse it. 2040 if (Tok.is(tok::kw_asm)) { 2041 SourceLocation Loc; 2042 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 2043 if (AsmLabel.isInvalid()) 2044 SkipUntil(tok::comma, true, true); 2045 2046 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 2047 DeclaratorInfo.SetRangeEnd(Loc); 2048 } 2049 2050 // If attributes exist after the declarator, parse them. 2051 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 2052 2053 // FIXME: When g++ adds support for this, we'll need to check whether it 2054 // goes before or after the GNU attributes and __asm__. 2055 ParseOptionalCXX0XVirtSpecifierSeq(VS, getCurrentClass().IsInterface); 2056 2057 InClassInitStyle HasInClassInit = ICIS_NoInit; 2058 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) { 2059 if (BitfieldSize.get()) { 2060 Diag(Tok, diag::err_bitfield_member_init); 2061 SkipUntil(tok::comma, true, true); 2062 } else { 2063 HasInitializer = true; 2064 if (!DeclaratorInfo.isDeclarationOfFunction() && 2065 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2066 != DeclSpec::SCS_static && 2067 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2068 != DeclSpec::SCS_typedef) 2069 HasInClassInit = Tok.is(tok::equal) ? ICIS_CopyInit : ICIS_ListInit; 2070 } 2071 } 2072 2073 // NOTE: If Sema is the Action module and declarator is an instance field, 2074 // this call will *not* return the created decl; It will return null. 2075 // See Sema::ActOnCXXMemberDeclarator for details. 2076 2077 Decl *ThisDecl = 0; 2078 if (DS.isFriendSpecified()) { 2079 // TODO: handle initializers, bitfields, 'delete' 2080 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 2081 TemplateParams); 2082 } else { 2083 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 2084 DeclaratorInfo, 2085 TemplateParams, 2086 BitfieldSize.release(), 2087 VS, HasInClassInit); 2088 if (AccessAttrs) 2089 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs, 2090 false, true); 2091 } 2092 2093 // Set the Decl for any late parsed attributes 2094 for (unsigned i = 0, ni = CommonLateParsedAttrs.size(); i < ni; ++i) { 2095 CommonLateParsedAttrs[i]->addDecl(ThisDecl); 2096 } 2097 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 2098 LateParsedAttrs[i]->addDecl(ThisDecl); 2099 } 2100 LateParsedAttrs.clear(); 2101 2102 // Handle the initializer. 2103 if (HasInClassInit != ICIS_NoInit) { 2104 // The initializer was deferred; parse it and cache the tokens. 2105 Diag(Tok, getLangOpts().CPlusPlus0x ? 2106 diag::warn_cxx98_compat_nonstatic_member_init : 2107 diag::ext_nonstatic_member_init); 2108 2109 if (DeclaratorInfo.isArrayOfUnknownBound()) { 2110 // C++11 [dcl.array]p3: An array bound may also be omitted when the 2111 // declarator is followed by an initializer. 2112 // 2113 // A brace-or-equal-initializer for a member-declarator is not an 2114 // initializer in the grammar, so this is ill-formed. 2115 Diag(Tok, diag::err_incomplete_array_member_init); 2116 SkipUntil(tok::comma, true, true); 2117 if (ThisDecl) 2118 // Avoid later warnings about a class member of incomplete type. 2119 ThisDecl->setInvalidDecl(); 2120 } else 2121 ParseCXXNonStaticMemberInitializer(ThisDecl); 2122 } else if (HasInitializer) { 2123 // Normal initializer. 2124 if (!Init.isUsable()) 2125 Init = ParseCXXMemberInitializer(ThisDecl, 2126 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 2127 2128 if (Init.isInvalid()) 2129 SkipUntil(tok::comma, true, true); 2130 else if (ThisDecl) 2131 Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid(), 2132 DS.getTypeSpecType() == DeclSpec::TST_auto); 2133 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) { 2134 // No initializer. 2135 Actions.ActOnUninitializedDecl(ThisDecl, 2136 DS.getTypeSpecType() == DeclSpec::TST_auto); 2137 } 2138 2139 if (ThisDecl) { 2140 Actions.FinalizeDeclaration(ThisDecl); 2141 DeclsInGroup.push_back(ThisDecl); 2142 } 2143 2144 if (ThisDecl && DeclaratorInfo.isFunctionDeclarator() && 2145 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 2146 != DeclSpec::SCS_typedef) { 2147 HandleMemberFunctionDeclDelays(DeclaratorInfo, ThisDecl); 2148 } 2149 2150 DeclaratorInfo.complete(ThisDecl); 2151 2152 // If we don't have a comma, it is either the end of the list (a ';') 2153 // or an error, bail out. 2154 if (Tok.isNot(tok::comma)) 2155 break; 2156 2157 // Consume the comma. 2158 SourceLocation CommaLoc = ConsumeToken(); 2159 2160 if (Tok.isAtStartOfLine() && 2161 !MightBeDeclarator(Declarator::MemberContext)) { 2162 // This comma was followed by a line-break and something which can't be 2163 // the start of a declarator. The comma was probably a typo for a 2164 // semicolon. 2165 Diag(CommaLoc, diag::err_expected_semi_declaration) 2166 << FixItHint::CreateReplacement(CommaLoc, ";"); 2167 ExpectSemi = false; 2168 break; 2169 } 2170 2171 // Parse the next declarator. 2172 DeclaratorInfo.clear(); 2173 VS.clear(); 2174 BitfieldSize = true; 2175 Init = true; 2176 HasInitializer = false; 2177 DeclaratorInfo.setCommaLoc(CommaLoc); 2178 2179 // Attributes are only allowed on the second declarator. 2180 MaybeParseGNUAttributes(DeclaratorInfo); 2181 2182 if (Tok.isNot(tok::colon)) 2183 ParseDeclarator(DeclaratorInfo); 2184 } 2185 2186 if (ExpectSemi && 2187 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 2188 // Skip to end of block or statement. 2189 SkipUntil(tok::r_brace, true, true); 2190 // If we stopped at a ';', eat it. 2191 if (Tok.is(tok::semi)) ConsumeToken(); 2192 return; 2193 } 2194 2195 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 2196 DeclsInGroup.size()); 2197} 2198 2199/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 2200/// pure-specifier. Also detect and reject any attempted defaulted/deleted 2201/// function definition. The location of the '=', if any, will be placed in 2202/// EqualLoc. 2203/// 2204/// pure-specifier: 2205/// '= 0' 2206/// 2207/// brace-or-equal-initializer: 2208/// '=' initializer-expression 2209/// braced-init-list 2210/// 2211/// initializer-clause: 2212/// assignment-expression 2213/// braced-init-list 2214/// 2215/// defaulted/deleted function-definition: 2216/// '=' 'default' 2217/// '=' 'delete' 2218/// 2219/// Prior to C++0x, the assignment-expression in an initializer-clause must 2220/// be a constant-expression. 2221ExprResult Parser::ParseCXXMemberInitializer(Decl *D, bool IsFunction, 2222 SourceLocation &EqualLoc) { 2223 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 2224 && "Data member initializer not starting with '=' or '{'"); 2225 2226 EnterExpressionEvaluationContext Context(Actions, 2227 Sema::PotentiallyEvaluated, 2228 D); 2229 if (Tok.is(tok::equal)) { 2230 EqualLoc = ConsumeToken(); 2231 if (Tok.is(tok::kw_delete)) { 2232 // In principle, an initializer of '= delete p;' is legal, but it will 2233 // never type-check. It's better to diagnose it as an ill-formed expression 2234 // than as an ill-formed deleted non-function member. 2235 // An initializer of '= delete p, foo' will never be parsed, because 2236 // a top-level comma always ends the initializer expression. 2237 const Token &Next = NextToken(); 2238 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 2239 Next.is(tok::eof)) { 2240 if (IsFunction) 2241 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 2242 << 1 /* delete */; 2243 else 2244 Diag(ConsumeToken(), diag::err_deleted_non_function); 2245 return ExprResult(); 2246 } 2247 } else if (Tok.is(tok::kw_default)) { 2248 if (IsFunction) 2249 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2250 << 0 /* default */; 2251 else 2252 Diag(ConsumeToken(), diag::err_default_special_members); 2253 return ExprResult(); 2254 } 2255 2256 } 2257 return ParseInitializer(); 2258} 2259 2260/// ParseCXXMemberSpecification - Parse the class definition. 2261/// 2262/// member-specification: 2263/// member-declaration member-specification[opt] 2264/// access-specifier ':' member-specification[opt] 2265/// 2266void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2267 unsigned TagType, Decl *TagDecl) { 2268 assert((TagType == DeclSpec::TST_struct || 2269 TagType == DeclSpec::TST_interface || 2270 TagType == DeclSpec::TST_union || 2271 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2272 2273 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2274 "parsing struct/union/class body"); 2275 2276 // Determine whether this is a non-nested class. Note that local 2277 // classes are *not* considered to be nested classes. 2278 bool NonNestedClass = true; 2279 if (!ClassStack.empty()) { 2280 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2281 if (S->isClassScope()) { 2282 // We're inside a class scope, so this is a nested class. 2283 NonNestedClass = false; 2284 2285 // The Microsoft extension __interface does not permit nested classes. 2286 if (getCurrentClass().IsInterface) { 2287 Diag(RecordLoc, diag::err_invalid_member_in_interface) 2288 << /*ErrorType=*/6 2289 << (isa<NamedDecl>(TagDecl) 2290 ? cast<NamedDecl>(TagDecl)->getQualifiedNameAsString() 2291 : "<anonymous>"); 2292 } 2293 break; 2294 } 2295 2296 if ((S->getFlags() & Scope::FnScope)) { 2297 // If we're in a function or function template declared in the 2298 // body of a class, then this is a local class rather than a 2299 // nested class. 2300 const Scope *Parent = S->getParent(); 2301 if (Parent->isTemplateParamScope()) 2302 Parent = Parent->getParent(); 2303 if (Parent->isClassScope()) 2304 break; 2305 } 2306 } 2307 } 2308 2309 // Enter a scope for the class. 2310 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2311 2312 // Note that we are parsing a new (potentially-nested) class definition. 2313 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass, 2314 TagType == DeclSpec::TST_interface); 2315 2316 if (TagDecl) 2317 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2318 2319 SourceLocation FinalLoc; 2320 2321 // Parse the optional 'final' keyword. 2322 if (getLangOpts().CPlusPlus && Tok.is(tok::identifier)) { 2323 assert(isCXX0XFinalKeyword() && "not a class definition"); 2324 FinalLoc = ConsumeToken(); 2325 2326 if (TagType == DeclSpec::TST_interface) { 2327 Diag(FinalLoc, diag::err_override_control_interface) 2328 << "final"; 2329 } else { 2330 Diag(FinalLoc, getLangOpts().CPlusPlus0x ? 2331 diag::warn_cxx98_compat_override_control_keyword : 2332 diag::ext_override_control_keyword) << "final"; 2333 } 2334 } 2335 2336 if (Tok.is(tok::colon)) { 2337 ParseBaseClause(TagDecl); 2338 2339 if (!Tok.is(tok::l_brace)) { 2340 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2341 2342 if (TagDecl) 2343 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2344 return; 2345 } 2346 } 2347 2348 assert(Tok.is(tok::l_brace)); 2349 BalancedDelimiterTracker T(*this, tok::l_brace); 2350 T.consumeOpen(); 2351 2352 if (TagDecl) 2353 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2354 T.getOpenLocation()); 2355 2356 // C++ 11p3: Members of a class defined with the keyword class are private 2357 // by default. Members of a class defined with the keywords struct or union 2358 // are public by default. 2359 AccessSpecifier CurAS; 2360 if (TagType == DeclSpec::TST_class) 2361 CurAS = AS_private; 2362 else 2363 CurAS = AS_public; 2364 ParsedAttributes AccessAttrs(AttrFactory); 2365 2366 if (TagDecl) { 2367 // While we still have something to read, read the member-declarations. 2368 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2369 // Each iteration of this loop reads one member-declaration. 2370 2371 if (getLangOpts().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2372 Tok.is(tok::kw___if_not_exists))) { 2373 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2374 continue; 2375 } 2376 2377 // Check for extraneous top-level semicolon. 2378 if (Tok.is(tok::semi)) { 2379 ConsumeExtraSemi(InsideStruct, TagType); 2380 continue; 2381 } 2382 2383 if (Tok.is(tok::annot_pragma_vis)) { 2384 HandlePragmaVisibility(); 2385 continue; 2386 } 2387 2388 if (Tok.is(tok::annot_pragma_pack)) { 2389 HandlePragmaPack(); 2390 continue; 2391 } 2392 2393 if (Tok.is(tok::annot_pragma_align)) { 2394 HandlePragmaAlign(); 2395 continue; 2396 } 2397 2398 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2399 if (AS != AS_none) { 2400 // Current token is a C++ access specifier. 2401 CurAS = AS; 2402 SourceLocation ASLoc = Tok.getLocation(); 2403 unsigned TokLength = Tok.getLength(); 2404 ConsumeToken(); 2405 AccessAttrs.clear(); 2406 MaybeParseGNUAttributes(AccessAttrs); 2407 2408 SourceLocation EndLoc; 2409 if (Tok.is(tok::colon)) { 2410 EndLoc = Tok.getLocation(); 2411 ConsumeToken(); 2412 } else if (Tok.is(tok::semi)) { 2413 EndLoc = Tok.getLocation(); 2414 ConsumeToken(); 2415 Diag(EndLoc, diag::err_expected_colon) 2416 << FixItHint::CreateReplacement(EndLoc, ":"); 2417 } else { 2418 EndLoc = ASLoc.getLocWithOffset(TokLength); 2419 Diag(EndLoc, diag::err_expected_colon) 2420 << FixItHint::CreateInsertion(EndLoc, ":"); 2421 } 2422 2423 // The Microsoft extension __interface does not permit non-public 2424 // access specifiers. 2425 if (TagType == DeclSpec::TST_interface && CurAS != AS_public) { 2426 Diag(ASLoc, diag::err_access_specifier_interface) 2427 << (CurAS == AS_protected); 2428 } 2429 2430 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc, 2431 AccessAttrs.getList())) { 2432 // found another attribute than only annotations 2433 AccessAttrs.clear(); 2434 } 2435 2436 continue; 2437 } 2438 2439 // FIXME: Make sure we don't have a template here. 2440 2441 // Parse all the comma separated declarators. 2442 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList()); 2443 } 2444 2445 T.consumeClose(); 2446 } else { 2447 SkipUntil(tok::r_brace, false, false); 2448 } 2449 2450 // If attributes exist after class contents, parse them. 2451 ParsedAttributes attrs(AttrFactory); 2452 MaybeParseGNUAttributes(attrs); 2453 2454 if (TagDecl) 2455 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2456 T.getOpenLocation(), 2457 T.getCloseLocation(), 2458 attrs.getList()); 2459 2460 // C++11 [class.mem]p2: 2461 // Within the class member-specification, the class is regarded as complete 2462 // within function bodies, default arguments, and 2463 // brace-or-equal-initializers for non-static data members (including such 2464 // things in nested classes). 2465 if (TagDecl && NonNestedClass) { 2466 // We are not inside a nested class. This class and its nested classes 2467 // are complete and we can parse the delayed portions of method 2468 // declarations and the lexed inline method definitions, along with any 2469 // delayed attributes. 2470 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2471 ParseLexedAttributes(getCurrentClass()); 2472 ParseLexedMethodDeclarations(getCurrentClass()); 2473 2474 // We've finished with all pending member declarations. 2475 Actions.ActOnFinishCXXMemberDecls(); 2476 2477 ParseLexedMemberInitializers(getCurrentClass()); 2478 ParseLexedMethodDefs(getCurrentClass()); 2479 PrevTokLocation = SavedPrevTokLocation; 2480 } 2481 2482 if (TagDecl) 2483 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 2484 T.getCloseLocation()); 2485 2486 // Leave the class scope. 2487 ParsingDef.Pop(); 2488 ClassScope.Exit(); 2489} 2490 2491/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2492/// which explicitly initializes the members or base classes of a 2493/// class (C++ [class.base.init]). For example, the three initializers 2494/// after the ':' in the Derived constructor below: 2495/// 2496/// @code 2497/// class Base { }; 2498/// class Derived : Base { 2499/// int x; 2500/// float f; 2501/// public: 2502/// Derived(float f) : Base(), x(17), f(f) { } 2503/// }; 2504/// @endcode 2505/// 2506/// [C++] ctor-initializer: 2507/// ':' mem-initializer-list 2508/// 2509/// [C++] mem-initializer-list: 2510/// mem-initializer ...[opt] 2511/// mem-initializer ...[opt] , mem-initializer-list 2512void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2513 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2514 2515 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2516 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2517 SourceLocation ColonLoc = ConsumeToken(); 2518 2519 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2520 bool AnyErrors = false; 2521 2522 do { 2523 if (Tok.is(tok::code_completion)) { 2524 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2525 MemInitializers.data(), 2526 MemInitializers.size()); 2527 return cutOffParsing(); 2528 } else { 2529 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2530 if (!MemInit.isInvalid()) 2531 MemInitializers.push_back(MemInit.get()); 2532 else 2533 AnyErrors = true; 2534 } 2535 2536 if (Tok.is(tok::comma)) 2537 ConsumeToken(); 2538 else if (Tok.is(tok::l_brace)) 2539 break; 2540 // If the next token looks like a base or member initializer, assume that 2541 // we're just missing a comma. 2542 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2543 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2544 Diag(Loc, diag::err_ctor_init_missing_comma) 2545 << FixItHint::CreateInsertion(Loc, ", "); 2546 } else { 2547 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2548 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2549 SkipUntil(tok::l_brace, true, true); 2550 break; 2551 } 2552 } while (true); 2553 2554 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2555 MemInitializers.data(), MemInitializers.size(), 2556 AnyErrors); 2557} 2558 2559/// ParseMemInitializer - Parse a C++ member initializer, which is 2560/// part of a constructor initializer that explicitly initializes one 2561/// member or base class (C++ [class.base.init]). See 2562/// ParseConstructorInitializer for an example. 2563/// 2564/// [C++] mem-initializer: 2565/// mem-initializer-id '(' expression-list[opt] ')' 2566/// [C++0x] mem-initializer-id braced-init-list 2567/// 2568/// [C++] mem-initializer-id: 2569/// '::'[opt] nested-name-specifier[opt] class-name 2570/// identifier 2571Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2572 // parse '::'[opt] nested-name-specifier[opt] 2573 CXXScopeSpec SS; 2574 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 2575 ParsedType TemplateTypeTy; 2576 if (Tok.is(tok::annot_template_id)) { 2577 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2578 if (TemplateId->Kind == TNK_Type_template || 2579 TemplateId->Kind == TNK_Dependent_template_name) { 2580 AnnotateTemplateIdTokenAsType(); 2581 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2582 TemplateTypeTy = getTypeAnnotation(Tok); 2583 } 2584 } 2585 // Uses of decltype will already have been converted to annot_decltype by 2586 // ParseOptionalCXXScopeSpecifier at this point. 2587 if (!TemplateTypeTy && Tok.isNot(tok::identifier) 2588 && Tok.isNot(tok::annot_decltype)) { 2589 Diag(Tok, diag::err_expected_member_or_base_name); 2590 return true; 2591 } 2592 2593 IdentifierInfo *II = 0; 2594 DeclSpec DS(AttrFactory); 2595 SourceLocation IdLoc = Tok.getLocation(); 2596 if (Tok.is(tok::annot_decltype)) { 2597 // Get the decltype expression, if there is one. 2598 ParseDecltypeSpecifier(DS); 2599 } else { 2600 if (Tok.is(tok::identifier)) 2601 // Get the identifier. This may be a member name or a class name, 2602 // but we'll let the semantic analysis determine which it is. 2603 II = Tok.getIdentifierInfo(); 2604 ConsumeToken(); 2605 } 2606 2607 2608 // Parse the '('. 2609 if (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace)) { 2610 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2611 2612 ExprResult InitList = ParseBraceInitializer(); 2613 if (InitList.isInvalid()) 2614 return true; 2615 2616 SourceLocation EllipsisLoc; 2617 if (Tok.is(tok::ellipsis)) 2618 EllipsisLoc = ConsumeToken(); 2619 2620 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2621 TemplateTypeTy, DS, IdLoc, 2622 InitList.take(), EllipsisLoc); 2623 } else if(Tok.is(tok::l_paren)) { 2624 BalancedDelimiterTracker T(*this, tok::l_paren); 2625 T.consumeOpen(); 2626 2627 // Parse the optional expression-list. 2628 ExprVector ArgExprs; 2629 CommaLocsTy CommaLocs; 2630 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2631 SkipUntil(tok::r_paren); 2632 return true; 2633 } 2634 2635 T.consumeClose(); 2636 2637 SourceLocation EllipsisLoc; 2638 if (Tok.is(tok::ellipsis)) 2639 EllipsisLoc = ConsumeToken(); 2640 2641 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2642 TemplateTypeTy, DS, IdLoc, 2643 T.getOpenLocation(), ArgExprs.data(), 2644 ArgExprs.size(), T.getCloseLocation(), 2645 EllipsisLoc); 2646 } 2647 2648 Diag(Tok, getLangOpts().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2649 : diag::err_expected_lparen); 2650 return true; 2651} 2652 2653/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2654/// 2655/// exception-specification: 2656/// dynamic-exception-specification 2657/// noexcept-specification 2658/// 2659/// noexcept-specification: 2660/// 'noexcept' 2661/// 'noexcept' '(' constant-expression ')' 2662ExceptionSpecificationType 2663Parser::tryParseExceptionSpecification( 2664 SourceRange &SpecificationRange, 2665 SmallVectorImpl<ParsedType> &DynamicExceptions, 2666 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2667 ExprResult &NoexceptExpr) { 2668 ExceptionSpecificationType Result = EST_None; 2669 2670 // See if there's a dynamic specification. 2671 if (Tok.is(tok::kw_throw)) { 2672 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2673 DynamicExceptions, 2674 DynamicExceptionRanges); 2675 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2676 "Produced different number of exception types and ranges."); 2677 } 2678 2679 // If there's no noexcept specification, we're done. 2680 if (Tok.isNot(tok::kw_noexcept)) 2681 return Result; 2682 2683 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); 2684 2685 // If we already had a dynamic specification, parse the noexcept for, 2686 // recovery, but emit a diagnostic and don't store the results. 2687 SourceRange NoexceptRange; 2688 ExceptionSpecificationType NoexceptType = EST_None; 2689 2690 SourceLocation KeywordLoc = ConsumeToken(); 2691 if (Tok.is(tok::l_paren)) { 2692 // There is an argument. 2693 BalancedDelimiterTracker T(*this, tok::l_paren); 2694 T.consumeOpen(); 2695 NoexceptType = EST_ComputedNoexcept; 2696 NoexceptExpr = ParseConstantExpression(); 2697 // The argument must be contextually convertible to bool. We use 2698 // ActOnBooleanCondition for this purpose. 2699 if (!NoexceptExpr.isInvalid()) 2700 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2701 NoexceptExpr.get()); 2702 T.consumeClose(); 2703 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); 2704 } else { 2705 // There is no argument. 2706 NoexceptType = EST_BasicNoexcept; 2707 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2708 } 2709 2710 if (Result == EST_None) { 2711 SpecificationRange = NoexceptRange; 2712 Result = NoexceptType; 2713 2714 // If there's a dynamic specification after a noexcept specification, 2715 // parse that and ignore the results. 2716 if (Tok.is(tok::kw_throw)) { 2717 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2718 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2719 DynamicExceptionRanges); 2720 } 2721 } else { 2722 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2723 } 2724 2725 return Result; 2726} 2727 2728/// ParseDynamicExceptionSpecification - Parse a C++ 2729/// dynamic-exception-specification (C++ [except.spec]). 2730/// 2731/// dynamic-exception-specification: 2732/// 'throw' '(' type-id-list [opt] ')' 2733/// [MS] 'throw' '(' '...' ')' 2734/// 2735/// type-id-list: 2736/// type-id ... [opt] 2737/// type-id-list ',' type-id ... [opt] 2738/// 2739ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2740 SourceRange &SpecificationRange, 2741 SmallVectorImpl<ParsedType> &Exceptions, 2742 SmallVectorImpl<SourceRange> &Ranges) { 2743 assert(Tok.is(tok::kw_throw) && "expected throw"); 2744 2745 SpecificationRange.setBegin(ConsumeToken()); 2746 BalancedDelimiterTracker T(*this, tok::l_paren); 2747 if (T.consumeOpen()) { 2748 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2749 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2750 return EST_DynamicNone; 2751 } 2752 2753 // Parse throw(...), a Microsoft extension that means "this function 2754 // can throw anything". 2755 if (Tok.is(tok::ellipsis)) { 2756 SourceLocation EllipsisLoc = ConsumeToken(); 2757 if (!getLangOpts().MicrosoftExt) 2758 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2759 T.consumeClose(); 2760 SpecificationRange.setEnd(T.getCloseLocation()); 2761 return EST_MSAny; 2762 } 2763 2764 // Parse the sequence of type-ids. 2765 SourceRange Range; 2766 while (Tok.isNot(tok::r_paren)) { 2767 TypeResult Res(ParseTypeName(&Range)); 2768 2769 if (Tok.is(tok::ellipsis)) { 2770 // C++0x [temp.variadic]p5: 2771 // - In a dynamic-exception-specification (15.4); the pattern is a 2772 // type-id. 2773 SourceLocation Ellipsis = ConsumeToken(); 2774 Range.setEnd(Ellipsis); 2775 if (!Res.isInvalid()) 2776 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2777 } 2778 2779 if (!Res.isInvalid()) { 2780 Exceptions.push_back(Res.get()); 2781 Ranges.push_back(Range); 2782 } 2783 2784 if (Tok.is(tok::comma)) 2785 ConsumeToken(); 2786 else 2787 break; 2788 } 2789 2790 T.consumeClose(); 2791 SpecificationRange.setEnd(T.getCloseLocation()); 2792 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2793} 2794 2795/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2796/// function declaration. 2797TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2798 assert(Tok.is(tok::arrow) && "expected arrow"); 2799 2800 ConsumeToken(); 2801 2802 return ParseTypeName(&Range, Declarator::TrailingReturnContext); 2803} 2804 2805/// \brief We have just started parsing the definition of a new class, 2806/// so push that class onto our stack of classes that is currently 2807/// being parsed. 2808Sema::ParsingClassState 2809Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass, 2810 bool IsInterface) { 2811 assert((NonNestedClass || !ClassStack.empty()) && 2812 "Nested class without outer class"); 2813 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass, IsInterface)); 2814 return Actions.PushParsingClass(); 2815} 2816 2817/// \brief Deallocate the given parsed class and all of its nested 2818/// classes. 2819void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2820 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2821 delete Class->LateParsedDeclarations[I]; 2822 delete Class; 2823} 2824 2825/// \brief Pop the top class of the stack of classes that are 2826/// currently being parsed. 2827/// 2828/// This routine should be called when we have finished parsing the 2829/// definition of a class, but have not yet popped the Scope 2830/// associated with the class's definition. 2831void Parser::PopParsingClass(Sema::ParsingClassState state) { 2832 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2833 2834 Actions.PopParsingClass(state); 2835 2836 ParsingClass *Victim = ClassStack.top(); 2837 ClassStack.pop(); 2838 if (Victim->TopLevelClass) { 2839 // Deallocate all of the nested classes of this class, 2840 // recursively: we don't need to keep any of this information. 2841 DeallocateParsedClasses(Victim); 2842 return; 2843 } 2844 assert(!ClassStack.empty() && "Missing top-level class?"); 2845 2846 if (Victim->LateParsedDeclarations.empty()) { 2847 // The victim is a nested class, but we will not need to perform 2848 // any processing after the definition of this class since it has 2849 // no members whose handling was delayed. Therefore, we can just 2850 // remove this nested class. 2851 DeallocateParsedClasses(Victim); 2852 return; 2853 } 2854 2855 // This nested class has some members that will need to be processed 2856 // after the top-level class is completely defined. Therefore, add 2857 // it to the list of nested classes within its parent. 2858 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2859 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2860 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2861} 2862 2863/// \brief Try to parse an 'identifier' which appears within an attribute-token. 2864/// 2865/// \return the parsed identifier on success, and 0 if the next token is not an 2866/// attribute-token. 2867/// 2868/// C++11 [dcl.attr.grammar]p3: 2869/// If a keyword or an alternative token that satisfies the syntactic 2870/// requirements of an identifier is contained in an attribute-token, 2871/// it is considered an identifier. 2872IdentifierInfo *Parser::TryParseCXX11AttributeIdentifier(SourceLocation &Loc) { 2873 switch (Tok.getKind()) { 2874 default: 2875 // Identifiers and keywords have identifier info attached. 2876 if (IdentifierInfo *II = Tok.getIdentifierInfo()) { 2877 Loc = ConsumeToken(); 2878 return II; 2879 } 2880 return 0; 2881 2882 case tok::ampamp: // 'and' 2883 case tok::pipe: // 'bitor' 2884 case tok::pipepipe: // 'or' 2885 case tok::caret: // 'xor' 2886 case tok::tilde: // 'compl' 2887 case tok::amp: // 'bitand' 2888 case tok::ampequal: // 'and_eq' 2889 case tok::pipeequal: // 'or_eq' 2890 case tok::caretequal: // 'xor_eq' 2891 case tok::exclaim: // 'not' 2892 case tok::exclaimequal: // 'not_eq' 2893 // Alternative tokens do not have identifier info, but their spelling 2894 // starts with an alphabetical character. 2895 llvm::SmallString<8> SpellingBuf; 2896 StringRef Spelling = PP.getSpelling(Tok.getLocation(), SpellingBuf); 2897 if (std::isalpha(Spelling[0])) { 2898 Loc = ConsumeToken(); 2899 return &PP.getIdentifierTable().get(Spelling); 2900 } 2901 return 0; 2902 } 2903} 2904 2905static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName, 2906 IdentifierInfo *ScopeName) { 2907 switch (AttributeList::getKind(AttrName, ScopeName, 2908 AttributeList::AS_CXX11)) { 2909 case AttributeList::AT_CarriesDependency: 2910 case AttributeList::AT_FallThrough: 2911 case AttributeList::AT_NoReturn: { 2912 return true; 2913 } 2914 2915 default: 2916 return false; 2917 } 2918} 2919 2920/// ParseCXX11AttributeSpecifier - Parse a C++11 attribute-specifier. Currently 2921/// only parses standard attributes. 2922/// 2923/// [C++11] attribute-specifier: 2924/// '[' '[' attribute-list ']' ']' 2925/// alignment-specifier 2926/// 2927/// [C++11] attribute-list: 2928/// attribute[opt] 2929/// attribute-list ',' attribute[opt] 2930/// attribute '...' 2931/// attribute-list ',' attribute '...' 2932/// 2933/// [C++11] attribute: 2934/// attribute-token attribute-argument-clause[opt] 2935/// 2936/// [C++11] attribute-token: 2937/// identifier 2938/// attribute-scoped-token 2939/// 2940/// [C++11] attribute-scoped-token: 2941/// attribute-namespace '::' identifier 2942/// 2943/// [C++11] attribute-namespace: 2944/// identifier 2945/// 2946/// [C++11] attribute-argument-clause: 2947/// '(' balanced-token-seq ')' 2948/// 2949/// [C++11] balanced-token-seq: 2950/// balanced-token 2951/// balanced-token-seq balanced-token 2952/// 2953/// [C++11] balanced-token: 2954/// '(' balanced-token-seq ')' 2955/// '[' balanced-token-seq ']' 2956/// '{' balanced-token-seq '}' 2957/// any token but '(', ')', '[', ']', '{', or '}' 2958void Parser::ParseCXX11AttributeSpecifier(ParsedAttributes &attrs, 2959 SourceLocation *endLoc) { 2960 if (Tok.is(tok::kw_alignas)) { 2961 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas); 2962 ParseAlignmentSpecifier(attrs, endLoc); 2963 return; 2964 } 2965 2966 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2967 && "Not a C++11 attribute list"); 2968 2969 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute); 2970 2971 ConsumeBracket(); 2972 ConsumeBracket(); 2973 2974 while (Tok.isNot(tok::r_square)) { 2975 // attribute not present 2976 if (Tok.is(tok::comma)) { 2977 ConsumeToken(); 2978 continue; 2979 } 2980 2981 SourceLocation ScopeLoc, AttrLoc; 2982 IdentifierInfo *ScopeName = 0, *AttrName = 0; 2983 2984 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); 2985 if (!AttrName) 2986 // Break out to the "expected ']'" diagnostic. 2987 break; 2988 2989 // scoped attribute 2990 if (Tok.is(tok::coloncolon)) { 2991 ConsumeToken(); 2992 2993 ScopeName = AttrName; 2994 ScopeLoc = AttrLoc; 2995 2996 AttrName = TryParseCXX11AttributeIdentifier(AttrLoc); 2997 if (!AttrName) { 2998 Diag(Tok.getLocation(), diag::err_expected_ident); 2999 SkipUntil(tok::r_square, tok::comma, true, true); 3000 continue; 3001 } 3002 } 3003 3004 bool StandardAttr = IsBuiltInOrStandardCXX11Attribute(AttrName,ScopeName); 3005 bool AttrParsed = false; 3006 3007 // Parse attribute arguments 3008 if (Tok.is(tok::l_paren)) { 3009 if (ScopeName && ScopeName->getName() == "gnu") { 3010 ParseGNUAttributeArgs(AttrName, AttrLoc, attrs, endLoc, 3011 ScopeName, ScopeLoc, AttributeList::AS_CXX11); 3012 AttrParsed = true; 3013 } else { 3014 if (StandardAttr) 3015 Diag(Tok.getLocation(), diag::err_cxx11_attribute_forbids_arguments) 3016 << AttrName->getName(); 3017 3018 // FIXME: handle other formats of c++11 attribute arguments 3019 ConsumeParen(); 3020 SkipUntil(tok::r_paren, false); 3021 } 3022 } 3023 3024 if (!AttrParsed) 3025 attrs.addNew(AttrName, 3026 SourceRange(ScopeLoc.isValid() ? ScopeLoc : AttrLoc, 3027 AttrLoc), 3028 ScopeName, ScopeLoc, 0, 3029 SourceLocation(), 0, 0, AttributeList::AS_CXX11); 3030 3031 if (Tok.is(tok::ellipsis)) { 3032 ConsumeToken(); 3033 3034 Diag(Tok, diag::err_cxx11_attribute_forbids_ellipsis) 3035 << AttrName->getName(); 3036 } 3037 } 3038 3039 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 3040 SkipUntil(tok::r_square, false); 3041 if (endLoc) 3042 *endLoc = Tok.getLocation(); 3043 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 3044 SkipUntil(tok::r_square, false); 3045} 3046 3047/// ParseCXX11Attributes - Parse a C++11 attribute-specifier-seq. 3048/// 3049/// attribute-specifier-seq: 3050/// attribute-specifier-seq[opt] attribute-specifier 3051void Parser::ParseCXX11Attributes(ParsedAttributesWithRange &attrs, 3052 SourceLocation *endLoc) { 3053 SourceLocation StartLoc = Tok.getLocation(), Loc; 3054 if (!endLoc) 3055 endLoc = &Loc; 3056 3057 do { 3058 ParseCXX11AttributeSpecifier(attrs, endLoc); 3059 } while (isCXX11AttributeSpecifier()); 3060 3061 attrs.Range = SourceRange(StartLoc, *endLoc); 3062} 3063 3064/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 3065/// 3066/// [MS] ms-attribute: 3067/// '[' token-seq ']' 3068/// 3069/// [MS] ms-attribute-seq: 3070/// ms-attribute[opt] 3071/// ms-attribute ms-attribute-seq 3072void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 3073 SourceLocation *endLoc) { 3074 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 3075 3076 while (Tok.is(tok::l_square)) { 3077 // FIXME: If this is actually a C++11 attribute, parse it as one. 3078 ConsumeBracket(); 3079 SkipUntil(tok::r_square, true, true); 3080 if (endLoc) *endLoc = Tok.getLocation(); 3081 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 3082 } 3083} 3084 3085void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 3086 AccessSpecifier& CurAS) { 3087 IfExistsCondition Result; 3088 if (ParseMicrosoftIfExistsCondition(Result)) 3089 return; 3090 3091 BalancedDelimiterTracker Braces(*this, tok::l_brace); 3092 if (Braces.consumeOpen()) { 3093 Diag(Tok, diag::err_expected_lbrace); 3094 return; 3095 } 3096 3097 switch (Result.Behavior) { 3098 case IEB_Parse: 3099 // Parse the declarations below. 3100 break; 3101 3102 case IEB_Dependent: 3103 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists) 3104 << Result.IsIfExists; 3105 // Fall through to skip. 3106 3107 case IEB_Skip: 3108 Braces.skipToEnd(); 3109 return; 3110 } 3111 3112 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 3113 // __if_exists, __if_not_exists can nest. 3114 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 3115 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 3116 continue; 3117 } 3118 3119 // Check for extraneous top-level semicolon. 3120 if (Tok.is(tok::semi)) { 3121 ConsumeExtraSemi(InsideStruct, TagType); 3122 continue; 3123 } 3124 3125 AccessSpecifier AS = getAccessSpecifierIfPresent(); 3126 if (AS != AS_none) { 3127 // Current token is a C++ access specifier. 3128 CurAS = AS; 3129 SourceLocation ASLoc = Tok.getLocation(); 3130 ConsumeToken(); 3131 if (Tok.is(tok::colon)) 3132 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 3133 else 3134 Diag(Tok, diag::err_expected_colon); 3135 ConsumeToken(); 3136 continue; 3137 } 3138 3139 // Parse all the comma separated declarators. 3140 ParseCXXClassMemberDeclaration(CurAS, 0); 3141 } 3142 3143 Braces.consumeClose(); 3144} 3145