ParseDeclCXX.cpp revision 22216eb4fb0936d2488fc03abd285d135c36ff01
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 "RAIIObjectsForParser.h" 22using namespace clang; 23 24/// ParseNamespace - We know that the current token is a namespace keyword. This 25/// may either be a top level namespace or a block-level namespace alias. If 26/// there was an inline keyword, it has already been parsed. 27/// 28/// namespace-definition: [C++ 7.3: basic.namespace] 29/// named-namespace-definition 30/// unnamed-namespace-definition 31/// 32/// unnamed-namespace-definition: 33/// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' 34/// 35/// named-namespace-definition: 36/// original-namespace-definition 37/// extension-namespace-definition 38/// 39/// original-namespace-definition: 40/// 'inline'[opt] 'namespace' identifier attributes[opt] 41/// '{' namespace-body '}' 42/// 43/// extension-namespace-definition: 44/// 'inline'[opt] 'namespace' original-namespace-name 45/// '{' namespace-body '}' 46/// 47/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 48/// 'namespace' identifier '=' qualified-namespace-specifier ';' 49/// 50Decl *Parser::ParseNamespace(unsigned Context, 51 SourceLocation &DeclEnd, 52 SourceLocation InlineLoc) { 53 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 54 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 55 ObjCDeclContextSwitch ObjCDC(*this); 56 57 if (Tok.is(tok::code_completion)) { 58 Actions.CodeCompleteNamespaceDecl(getCurScope()); 59 cutOffParsing(); 60 return 0; 61 } 62 63 SourceLocation IdentLoc; 64 IdentifierInfo *Ident = 0; 65 std::vector<SourceLocation> ExtraIdentLoc; 66 std::vector<IdentifierInfo*> ExtraIdent; 67 std::vector<SourceLocation> ExtraNamespaceLoc; 68 69 Token attrTok; 70 71 if (Tok.is(tok::identifier)) { 72 Ident = Tok.getIdentifierInfo(); 73 IdentLoc = ConsumeToken(); // eat the identifier. 74 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { 75 ExtraNamespaceLoc.push_back(ConsumeToken()); 76 ExtraIdent.push_back(Tok.getIdentifierInfo()); 77 ExtraIdentLoc.push_back(ConsumeToken()); 78 } 79 } 80 81 // Read label attributes, if present. 82 ParsedAttributes attrs(AttrFactory); 83 if (Tok.is(tok::kw___attribute)) { 84 attrTok = Tok; 85 ParseGNUAttributes(attrs); 86 } 87 88 if (Tok.is(tok::equal)) { 89 if (!attrs.empty()) 90 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 91 if (InlineLoc.isValid()) 92 Diag(InlineLoc, diag::err_inline_namespace_alias) 93 << FixItHint::CreateRemoval(InlineLoc); 94 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 95 } 96 97 98 BalancedDelimiterTracker T(*this, tok::l_brace); 99 if (T.consumeOpen()) { 100 if (!ExtraIdent.empty()) { 101 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 102 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 103 } 104 Diag(Tok, Ident ? diag::err_expected_lbrace : 105 diag::err_expected_ident_lbrace); 106 return 0; 107 } 108 109 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 110 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 111 getCurScope()->getFnParent()) { 112 if (!ExtraIdent.empty()) { 113 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 114 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 115 } 116 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); 117 SkipUntil(tok::r_brace, false); 118 return 0; 119 } 120 121 if (!ExtraIdent.empty()) { 122 TentativeParsingAction TPA(*this); 123 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 124 Token rBraceToken = Tok; 125 TPA.Revert(); 126 127 if (!rBraceToken.is(tok::r_brace)) { 128 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 129 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 130 } else { 131 std::string NamespaceFix; 132 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 133 E = ExtraIdent.end(); I != E; ++I) { 134 NamespaceFix += " { namespace "; 135 NamespaceFix += (*I)->getName(); 136 } 137 138 std::string RBraces; 139 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 140 RBraces += "} "; 141 142 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 143 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 144 ExtraIdentLoc.back()), 145 NamespaceFix) 146 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 147 } 148 } 149 150 // If we're still good, complain about inline namespaces in non-C++0x now. 151 if (InlineLoc.isValid()) 152 Diag(InlineLoc, getLang().CPlusPlus0x ? 153 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace); 154 155 // Enter a scope for the namespace. 156 ParseScope NamespaceScope(this, Scope::DeclScope); 157 158 Decl *NamespcDecl = 159 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, 160 IdentLoc, Ident, T.getOpenLocation(), 161 attrs.getList()); 162 163 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 164 "parsing namespace"); 165 166 // Parse the contents of the namespace. This includes parsing recovery on 167 // any improperly nested namespaces. 168 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 169 InlineLoc, attrs, T); 170 171 // Leave the namespace scope. 172 NamespaceScope.Exit(); 173 174 DeclEnd = T.getCloseLocation(); 175 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); 176 177 return NamespcDecl; 178} 179 180/// ParseInnerNamespace - Parse the contents of a namespace. 181void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc, 182 std::vector<IdentifierInfo*>& Ident, 183 std::vector<SourceLocation>& NamespaceLoc, 184 unsigned int index, SourceLocation& InlineLoc, 185 ParsedAttributes& attrs, 186 BalancedDelimiterTracker &Tracker) { 187 if (index == Ident.size()) { 188 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 189 ParsedAttributesWithRange attrs(AttrFactory); 190 MaybeParseCXX0XAttributes(attrs); 191 MaybeParseMicrosoftAttributes(attrs); 192 ParseExternalDeclaration(attrs); 193 } 194 195 // The caller is what called check -- we are simply calling 196 // the close for it. 197 Tracker.consumeClose(); 198 199 return; 200 } 201 202 // Parse improperly nested namespaces. 203 ParseScope NamespaceScope(this, Scope::DeclScope); 204 Decl *NamespcDecl = 205 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 206 NamespaceLoc[index], IdentLoc[index], 207 Ident[index], Tracker.getOpenLocation(), 208 attrs.getList()); 209 210 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 211 attrs, Tracker); 212 213 NamespaceScope.Exit(); 214 215 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); 216} 217 218/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 219/// alias definition. 220/// 221Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 222 SourceLocation AliasLoc, 223 IdentifierInfo *Alias, 224 SourceLocation &DeclEnd) { 225 assert(Tok.is(tok::equal) && "Not equal token"); 226 227 ConsumeToken(); // eat the '='. 228 229 if (Tok.is(tok::code_completion)) { 230 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 231 cutOffParsing(); 232 return 0; 233 } 234 235 CXXScopeSpec SS; 236 // Parse (optional) nested-name-specifier. 237 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 238 239 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 240 Diag(Tok, diag::err_expected_namespace_name); 241 // Skip to end of the definition and eat the ';'. 242 SkipUntil(tok::semi); 243 return 0; 244 } 245 246 // Parse identifier. 247 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 248 SourceLocation IdentLoc = ConsumeToken(); 249 250 // Eat the ';'. 251 DeclEnd = Tok.getLocation(); 252 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 253 "", tok::semi); 254 255 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 256 SS, IdentLoc, Ident); 257} 258 259/// ParseLinkage - We know that the current token is a string_literal 260/// and just before that, that extern was seen. 261/// 262/// linkage-specification: [C++ 7.5p2: dcl.link] 263/// 'extern' string-literal '{' declaration-seq[opt] '}' 264/// 'extern' string-literal declaration 265/// 266Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 267 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 268 llvm::SmallString<8> LangBuffer; 269 bool Invalid = false; 270 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 271 if (Invalid) 272 return 0; 273 274 SourceLocation Loc = ConsumeStringToken(); 275 276 ParseScope LinkageScope(this, Scope::DeclScope); 277 Decl *LinkageSpec 278 = Actions.ActOnStartLinkageSpecification(getCurScope(), 279 DS.getSourceRange().getBegin(), 280 Loc, Lang, 281 Tok.is(tok::l_brace) ? Tok.getLocation() 282 : SourceLocation()); 283 284 ParsedAttributesWithRange attrs(AttrFactory); 285 MaybeParseCXX0XAttributes(attrs); 286 MaybeParseMicrosoftAttributes(attrs); 287 288 if (Tok.isNot(tok::l_brace)) { 289 // Reset the source range in DS, as the leading "extern" 290 // does not really belong to the inner declaration ... 291 DS.SetRangeStart(SourceLocation()); 292 DS.SetRangeEnd(SourceLocation()); 293 // ... but anyway remember that such an "extern" was seen. 294 DS.setExternInLinkageSpec(true); 295 ParseExternalDeclaration(attrs, &DS); 296 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 297 SourceLocation()); 298 } 299 300 DS.abort(); 301 302 ProhibitAttributes(attrs); 303 304 BalancedDelimiterTracker T(*this, tok::l_brace); 305 T.consumeOpen(); 306 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 307 ParsedAttributesWithRange attrs(AttrFactory); 308 MaybeParseCXX0XAttributes(attrs); 309 MaybeParseMicrosoftAttributes(attrs); 310 ParseExternalDeclaration(attrs); 311 } 312 313 T.consumeClose(); 314 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 315 T.getCloseLocation()); 316} 317 318/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 319/// using-directive. Assumes that current token is 'using'. 320Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 321 const ParsedTemplateInfo &TemplateInfo, 322 SourceLocation &DeclEnd, 323 ParsedAttributesWithRange &attrs, 324 Decl **OwnedType) { 325 assert(Tok.is(tok::kw_using) && "Not using token"); 326 ObjCDeclContextSwitch ObjCDC(*this); 327 328 // Eat 'using'. 329 SourceLocation UsingLoc = ConsumeToken(); 330 331 if (Tok.is(tok::code_completion)) { 332 Actions.CodeCompleteUsing(getCurScope()); 333 cutOffParsing(); 334 return 0; 335 } 336 337 // 'using namespace' means this is a using-directive. 338 if (Tok.is(tok::kw_namespace)) { 339 // Template parameters are always an error here. 340 if (TemplateInfo.Kind) { 341 SourceRange R = TemplateInfo.getSourceRange(); 342 Diag(UsingLoc, diag::err_templated_using_directive) 343 << R << FixItHint::CreateRemoval(R); 344 } 345 346 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 347 } 348 349 // Otherwise, it must be a using-declaration or an alias-declaration. 350 351 // Using declarations can't have attributes. 352 ProhibitAttributes(attrs); 353 354 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 355 AS_none, OwnedType); 356} 357 358/// ParseUsingDirective - Parse C++ using-directive, assumes 359/// that current token is 'namespace' and 'using' was already parsed. 360/// 361/// using-directive: [C++ 7.3.p4: namespace.udir] 362/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 363/// namespace-name ; 364/// [GNU] using-directive: 365/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 366/// namespace-name attributes[opt] ; 367/// 368Decl *Parser::ParseUsingDirective(unsigned Context, 369 SourceLocation UsingLoc, 370 SourceLocation &DeclEnd, 371 ParsedAttributes &attrs) { 372 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 373 374 // Eat 'namespace'. 375 SourceLocation NamespcLoc = ConsumeToken(); 376 377 if (Tok.is(tok::code_completion)) { 378 Actions.CodeCompleteUsingDirective(getCurScope()); 379 cutOffParsing(); 380 return 0; 381 } 382 383 CXXScopeSpec SS; 384 // Parse (optional) nested-name-specifier. 385 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 386 387 IdentifierInfo *NamespcName = 0; 388 SourceLocation IdentLoc = SourceLocation(); 389 390 // Parse namespace-name. 391 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 392 Diag(Tok, diag::err_expected_namespace_name); 393 // If there was invalid namespace name, skip to end of decl, and eat ';'. 394 SkipUntil(tok::semi); 395 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 396 return 0; 397 } 398 399 // Parse identifier. 400 NamespcName = Tok.getIdentifierInfo(); 401 IdentLoc = ConsumeToken(); 402 403 // Parse (optional) attributes (most likely GNU strong-using extension). 404 bool GNUAttr = false; 405 if (Tok.is(tok::kw___attribute)) { 406 GNUAttr = true; 407 ParseGNUAttributes(attrs); 408 } 409 410 // Eat ';'. 411 DeclEnd = Tok.getLocation(); 412 ExpectAndConsume(tok::semi, 413 GNUAttr ? diag::err_expected_semi_after_attribute_list 414 : diag::err_expected_semi_after_namespace_name, 415 "", tok::semi); 416 417 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 418 IdentLoc, NamespcName, attrs.getList()); 419} 420 421/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 422/// Assumes that 'using' was already seen. 423/// 424/// using-declaration: [C++ 7.3.p3: namespace.udecl] 425/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 426/// unqualified-id 427/// 'using' :: unqualified-id 428/// 429/// alias-declaration: C++0x [decl.typedef]p2 430/// 'using' identifier = type-id ; 431/// 432Decl *Parser::ParseUsingDeclaration(unsigned Context, 433 const ParsedTemplateInfo &TemplateInfo, 434 SourceLocation UsingLoc, 435 SourceLocation &DeclEnd, 436 AccessSpecifier AS, 437 Decl **OwnedType) { 438 CXXScopeSpec SS; 439 SourceLocation TypenameLoc; 440 bool IsTypeName; 441 442 // Ignore optional 'typename'. 443 // FIXME: This is wrong; we should parse this as a typename-specifier. 444 if (Tok.is(tok::kw_typename)) { 445 TypenameLoc = Tok.getLocation(); 446 ConsumeToken(); 447 IsTypeName = true; 448 } 449 else 450 IsTypeName = false; 451 452 // Parse nested-name-specifier. 453 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 454 455 // Check nested-name specifier. 456 if (SS.isInvalid()) { 457 SkipUntil(tok::semi); 458 return 0; 459 } 460 461 // Parse the unqualified-id. We allow parsing of both constructor and 462 // destructor names and allow the action module to diagnose any semantic 463 // errors. 464 UnqualifiedId Name; 465 if (ParseUnqualifiedId(SS, 466 /*EnteringContext=*/false, 467 /*AllowDestructorName=*/true, 468 /*AllowConstructorName=*/true, 469 ParsedType(), 470 Name)) { 471 SkipUntil(tok::semi); 472 return 0; 473 } 474 475 ParsedAttributes attrs(AttrFactory); 476 477 // Maybe this is an alias-declaration. 478 bool IsAliasDecl = Tok.is(tok::equal); 479 TypeResult TypeAlias; 480 if (IsAliasDecl) { 481 // TODO: Attribute support. C++0x attributes may appear before the equals. 482 // Where can GNU attributes appear? 483 ConsumeToken(); 484 485 Diag(Tok.getLocation(), getLang().CPlusPlus0x ? 486 diag::warn_cxx98_compat_alias_declaration : 487 diag::ext_alias_declaration); 488 489 // Type alias templates cannot be specialized. 490 int SpecKind = -1; 491 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 492 Name.getKind() == UnqualifiedId::IK_TemplateId) 493 SpecKind = 0; 494 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 495 SpecKind = 1; 496 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 497 SpecKind = 2; 498 if (SpecKind != -1) { 499 SourceRange Range; 500 if (SpecKind == 0) 501 Range = SourceRange(Name.TemplateId->LAngleLoc, 502 Name.TemplateId->RAngleLoc); 503 else 504 Range = TemplateInfo.getSourceRange(); 505 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 506 << SpecKind << Range; 507 SkipUntil(tok::semi); 508 return 0; 509 } 510 511 // Name must be an identifier. 512 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 513 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 514 // No removal fixit: can't recover from this. 515 SkipUntil(tok::semi); 516 return 0; 517 } else if (IsTypeName) 518 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 519 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 520 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 521 else if (SS.isNotEmpty()) 522 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 523 << FixItHint::CreateRemoval(SS.getRange()); 524 525 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 526 Declarator::AliasTemplateContext : 527 Declarator::AliasDeclContext, AS, OwnedType); 528 } else 529 // Parse (optional) attributes (most likely GNU strong-using extension). 530 MaybeParseGNUAttributes(attrs); 531 532 // Eat ';'. 533 DeclEnd = Tok.getLocation(); 534 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 535 !attrs.empty() ? "attributes list" : 536 IsAliasDecl ? "alias declaration" : "using declaration", 537 tok::semi); 538 539 // Diagnose an attempt to declare a templated using-declaration. 540 // In C++0x, alias-declarations can be templates: 541 // template <...> using id = type; 542 if (TemplateInfo.Kind && !IsAliasDecl) { 543 SourceRange R = TemplateInfo.getSourceRange(); 544 Diag(UsingLoc, diag::err_templated_using_declaration) 545 << R << FixItHint::CreateRemoval(R); 546 547 // Unfortunately, we have to bail out instead of recovering by 548 // ignoring the parameters, just in case the nested name specifier 549 // depends on the parameters. 550 return 0; 551 } 552 553 // "typename" keyword is allowed for identifiers only, 554 // because it may be a type definition. 555 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) { 556 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) 557 << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); 558 // Proceed parsing, but reset the IsTypeName flag. 559 IsTypeName = false; 560 } 561 562 if (IsAliasDecl) { 563 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 564 MultiTemplateParamsArg TemplateParamsArg(Actions, 565 TemplateParams ? TemplateParams->data() : 0, 566 TemplateParams ? TemplateParams->size() : 0); 567 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 568 UsingLoc, Name, TypeAlias); 569 } 570 571 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 572 Name, attrs.getList(), 573 IsTypeName, TypenameLoc); 574} 575 576/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 577/// 578/// [C++0x] static_assert-declaration: 579/// static_assert ( constant-expression , string-literal ) ; 580/// 581/// [C1X] static_assert-declaration: 582/// _Static_assert ( constant-expression , string-literal ) ; 583/// 584Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 585 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 586 "Not a static_assert declaration"); 587 588 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 589 Diag(Tok, diag::ext_c1x_static_assert); 590 if (Tok.is(tok::kw_static_assert)) 591 Diag(Tok, diag::warn_cxx98_compat_static_assert); 592 593 SourceLocation StaticAssertLoc = ConsumeToken(); 594 595 BalancedDelimiterTracker T(*this, tok::l_paren); 596 if (T.consumeOpen()) { 597 Diag(Tok, diag::err_expected_lparen); 598 return 0; 599 } 600 601 ExprResult AssertExpr(ParseConstantExpression()); 602 if (AssertExpr.isInvalid()) { 603 SkipUntil(tok::semi); 604 return 0; 605 } 606 607 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 608 return 0; 609 610 if (Tok.isNot(tok::string_literal)) { 611 Diag(Tok, diag::err_expected_string_literal); 612 SkipUntil(tok::semi); 613 return 0; 614 } 615 616 ExprResult AssertMessage(ParseStringLiteralExpression()); 617 if (AssertMessage.isInvalid()) 618 return 0; 619 620 T.consumeClose(); 621 622 DeclEnd = Tok.getLocation(); 623 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 624 625 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 626 AssertExpr.take(), 627 AssertMessage.take(), 628 T.getCloseLocation()); 629} 630 631/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 632/// 633/// 'decltype' ( expression ) 634/// 635void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 636 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 637 638 SourceLocation StartLoc = ConsumeToken(); 639 BalancedDelimiterTracker T(*this, tok::l_paren); 640 if (T.expectAndConsume(diag::err_expected_lparen_after, 641 "decltype", tok::r_paren)) { 642 return; 643 } 644 645 // Parse the expression 646 647 // C++0x [dcl.type.simple]p4: 648 // The operand of the decltype specifier is an unevaluated operand. 649 EnterExpressionEvaluationContext Unevaluated(Actions, 650 Sema::Unevaluated); 651 ExprResult Result = ParseExpression(); 652 if (Result.isInvalid()) { 653 SkipUntil(tok::r_paren); 654 return; 655 } 656 657 // Match the ')' 658 T.consumeClose(); 659 if (T.getCloseLocation().isInvalid()) 660 return; 661 662 const char *PrevSpec = 0; 663 unsigned DiagID; 664 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 665 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 666 DiagID, Result.release())) 667 Diag(StartLoc, DiagID) << PrevSpec; 668} 669 670void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 671 assert(Tok.is(tok::kw___underlying_type) && 672 "Not an underlying type specifier"); 673 674 SourceLocation StartLoc = ConsumeToken(); 675 BalancedDelimiterTracker T(*this, tok::l_paren); 676 if (T.expectAndConsume(diag::err_expected_lparen_after, 677 "__underlying_type", tok::r_paren)) { 678 return; 679 } 680 681 TypeResult Result = ParseTypeName(); 682 if (Result.isInvalid()) { 683 SkipUntil(tok::r_paren); 684 return; 685 } 686 687 // Match the ')' 688 T.consumeClose(); 689 if (T.getCloseLocation().isInvalid()) 690 return; 691 692 const char *PrevSpec = 0; 693 unsigned DiagID; 694 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 695 DiagID, Result.release())) 696 Diag(StartLoc, DiagID) << PrevSpec; 697} 698 699/// ParseBaseTypeSpecifier - Parse a C++ base-type-specifier which is either a 700/// class name or decltype-specifier. Note that we only check that the result 701/// names a type; semantic analysis will need to verify that the type names a 702/// class. The result is either a type or null, depending on whether a type 703/// name was found. 704/// 705/// base-type-specifier: [C++ 10.1] 706/// class-or-decltype 707/// class-or-decltype: [C++ 10.1] 708/// nested-name-specifier[opt] class-name 709/// decltype-specifier 710/// class-name: [C++ 9.1] 711/// identifier 712/// simple-template-id 713/// 714Parser::TypeResult Parser::ParseBaseTypeSpecifier(SourceLocation &BaseLoc, 715 SourceLocation &EndLocation) { 716 // Parse decltype-specifier 717 if (Tok.is(tok::kw_decltype)) { 718 // Fake up a Declarator to use with ActOnTypeName. 719 DeclSpec DS(AttrFactory); 720 721 ParseDecltypeSpecifier(DS); 722 EndLocation = DS.getSourceRange().getEnd(); 723 724 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 725 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 726 } 727 728 // Parse optional nested-name-specifier 729 CXXScopeSpec SS; 730 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 731 732 BaseLoc = Tok.getLocation(); 733 734 // Check whether we have a template-id that names a type. 735 if (Tok.is(tok::annot_template_id)) { 736 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 737 if (TemplateId->Kind == TNK_Type_template || 738 TemplateId->Kind == TNK_Dependent_template_name) { 739 AnnotateTemplateIdTokenAsType(); 740 741 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 742 ParsedType Type = getTypeAnnotation(Tok); 743 EndLocation = Tok.getAnnotationEndLoc(); 744 ConsumeToken(); 745 746 if (Type) 747 return Type; 748 return true; 749 } 750 751 // Fall through to produce an error below. 752 } 753 754 if (Tok.isNot(tok::identifier)) { 755 Diag(Tok, diag::err_expected_class_name); 756 return true; 757 } 758 759 IdentifierInfo *Id = Tok.getIdentifierInfo(); 760 SourceLocation IdLoc = ConsumeToken(); 761 762 if (Tok.is(tok::less)) { 763 // It looks the user intended to write a template-id here, but the 764 // template-name was wrong. Try to fix that. 765 TemplateNameKind TNK = TNK_Type_template; 766 TemplateTy Template; 767 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 768 &SS, Template, TNK)) { 769 Diag(IdLoc, diag::err_unknown_template_name) 770 << Id; 771 } 772 773 if (!Template) 774 return true; 775 776 // Form the template name 777 UnqualifiedId TemplateName; 778 TemplateName.setIdentifier(Id, IdLoc); 779 780 // Parse the full template-id, then turn it into a type. 781 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 782 SourceLocation(), true)) 783 return true; 784 if (TNK == TNK_Dependent_template_name) 785 AnnotateTemplateIdTokenAsType(); 786 787 // If we didn't end up with a typename token, there's nothing more we 788 // can do. 789 if (Tok.isNot(tok::annot_typename)) 790 return true; 791 792 // Retrieve the type from the annotation token, consume that token, and 793 // return. 794 EndLocation = Tok.getAnnotationEndLoc(); 795 ParsedType Type = getTypeAnnotation(Tok); 796 ConsumeToken(); 797 return Type; 798 } 799 800 // We have an identifier; check whether it is actually a type. 801 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 802 false, ParsedType(), 803 /*NonTrivialTypeSourceInfo=*/true); 804 if (!Type) { 805 Diag(IdLoc, diag::err_expected_class_name); 806 return true; 807 } 808 809 // Consume the identifier. 810 EndLocation = IdLoc; 811 812 // Fake up a Declarator to use with ActOnTypeName. 813 DeclSpec DS(AttrFactory); 814 DS.SetRangeStart(IdLoc); 815 DS.SetRangeEnd(EndLocation); 816 DS.getTypeSpecScope() = SS; 817 818 const char *PrevSpec = 0; 819 unsigned DiagID; 820 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 821 822 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 823 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 824} 825 826/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 827/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 828/// until we reach the start of a definition or see a token that 829/// cannot start a definition. If SuppressDeclarations is true, we do know. 830/// 831/// class-specifier: [C++ class] 832/// class-head '{' member-specification[opt] '}' 833/// class-head '{' member-specification[opt] '}' attributes[opt] 834/// class-head: 835/// class-key identifier[opt] base-clause[opt] 836/// class-key nested-name-specifier identifier base-clause[opt] 837/// class-key nested-name-specifier[opt] simple-template-id 838/// base-clause[opt] 839/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 840/// [GNU] class-key attributes[opt] nested-name-specifier 841/// identifier base-clause[opt] 842/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 843/// simple-template-id base-clause[opt] 844/// class-key: 845/// 'class' 846/// 'struct' 847/// 'union' 848/// 849/// elaborated-type-specifier: [C++ dcl.type.elab] 850/// class-key ::[opt] nested-name-specifier[opt] identifier 851/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 852/// simple-template-id 853/// 854/// Note that the C++ class-specifier and elaborated-type-specifier, 855/// together, subsume the C99 struct-or-union-specifier: 856/// 857/// struct-or-union-specifier: [C99 6.7.2.1] 858/// struct-or-union identifier[opt] '{' struct-contents '}' 859/// struct-or-union identifier 860/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 861/// '}' attributes[opt] 862/// [GNU] struct-or-union attributes[opt] identifier 863/// struct-or-union: 864/// 'struct' 865/// 'union' 866void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 867 SourceLocation StartLoc, DeclSpec &DS, 868 const ParsedTemplateInfo &TemplateInfo, 869 AccessSpecifier AS, bool SuppressDeclarations){ 870 DeclSpec::TST TagType; 871 if (TagTokKind == tok::kw_struct) 872 TagType = DeclSpec::TST_struct; 873 else if (TagTokKind == tok::kw_class) 874 TagType = DeclSpec::TST_class; 875 else { 876 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 877 TagType = DeclSpec::TST_union; 878 } 879 880 if (Tok.is(tok::code_completion)) { 881 // Code completion for a struct, class, or union name. 882 Actions.CodeCompleteTag(getCurScope(), TagType); 883 return cutOffParsing(); 884 } 885 886 // C++03 [temp.explicit] 14.7.2/8: 887 // The usual access checking rules do not apply to names used to specify 888 // explicit instantiations. 889 // 890 // As an extension we do not perform access checking on the names used to 891 // specify explicit specializations either. This is important to allow 892 // specializing traits classes for private types. 893 bool SuppressingAccessChecks = false; 894 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 895 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 896 Actions.ActOnStartSuppressingAccessChecks(); 897 SuppressingAccessChecks = true; 898 } 899 900 ParsedAttributes attrs(AttrFactory); 901 // If attributes exist after tag, parse them. 902 if (Tok.is(tok::kw___attribute)) 903 ParseGNUAttributes(attrs); 904 905 // If declspecs exist after tag, parse them. 906 while (Tok.is(tok::kw___declspec)) 907 ParseMicrosoftDeclSpec(attrs); 908 909 // If C++0x attributes exist here, parse them. 910 // FIXME: Are we consistent with the ordering of parsing of different 911 // styles of attributes? 912 MaybeParseCXX0XAttributes(attrs); 913 914 if (TagType == DeclSpec::TST_struct && 915 !Tok.is(tok::identifier) && 916 Tok.getIdentifierInfo() && 917 (Tok.is(tok::kw___is_arithmetic) || 918 Tok.is(tok::kw___is_convertible) || 919 Tok.is(tok::kw___is_empty) || 920 Tok.is(tok::kw___is_floating_point) || 921 Tok.is(tok::kw___is_function) || 922 Tok.is(tok::kw___is_fundamental) || 923 Tok.is(tok::kw___is_integral) || 924 Tok.is(tok::kw___is_member_function_pointer) || 925 Tok.is(tok::kw___is_member_pointer) || 926 Tok.is(tok::kw___is_pod) || 927 Tok.is(tok::kw___is_pointer) || 928 Tok.is(tok::kw___is_same) || 929 Tok.is(tok::kw___is_scalar) || 930 Tok.is(tok::kw___is_signed) || 931 Tok.is(tok::kw___is_unsigned) || 932 Tok.is(tok::kw___is_void))) { 933 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 934 // name of struct templates, but some are keywords in GCC >= 4.3 935 // and Clang. Therefore, when we see the token sequence "struct 936 // X", make X into a normal identifier rather than a keyword, to 937 // allow libstdc++ 4.2 and libc++ to work properly. 938 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 939 Tok.setKind(tok::identifier); 940 } 941 942 // Parse the (optional) nested-name-specifier. 943 CXXScopeSpec &SS = DS.getTypeSpecScope(); 944 if (getLang().CPlusPlus) { 945 // "FOO : BAR" is not a potential typo for "FOO::BAR". 946 ColonProtectionRAIIObject X(*this); 947 948 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 949 DS.SetTypeSpecError(); 950 if (SS.isSet()) 951 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 952 Diag(Tok, diag::err_expected_ident); 953 } 954 955 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 956 957 // Parse the (optional) class name or simple-template-id. 958 IdentifierInfo *Name = 0; 959 SourceLocation NameLoc; 960 TemplateIdAnnotation *TemplateId = 0; 961 if (Tok.is(tok::identifier)) { 962 Name = Tok.getIdentifierInfo(); 963 NameLoc = ConsumeToken(); 964 965 if (Tok.is(tok::less) && getLang().CPlusPlus) { 966 // The name was supposed to refer to a template, but didn't. 967 // Eat the template argument list and try to continue parsing this as 968 // a class (or template thereof). 969 TemplateArgList TemplateArgs; 970 SourceLocation LAngleLoc, RAngleLoc; 971 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 972 true, LAngleLoc, 973 TemplateArgs, RAngleLoc)) { 974 // We couldn't parse the template argument list at all, so don't 975 // try to give any location information for the list. 976 LAngleLoc = RAngleLoc = SourceLocation(); 977 } 978 979 Diag(NameLoc, diag::err_explicit_spec_non_template) 980 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 981 << (TagType == DeclSpec::TST_class? 0 982 : TagType == DeclSpec::TST_struct? 1 983 : 2) 984 << Name 985 << SourceRange(LAngleLoc, RAngleLoc); 986 987 // Strip off the last template parameter list if it was empty, since 988 // we've removed its template argument list. 989 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 990 if (TemplateParams && TemplateParams->size() > 1) { 991 TemplateParams->pop_back(); 992 } else { 993 TemplateParams = 0; 994 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 995 = ParsedTemplateInfo::NonTemplate; 996 } 997 } else if (TemplateInfo.Kind 998 == ParsedTemplateInfo::ExplicitInstantiation) { 999 // Pretend this is just a forward declaration. 1000 TemplateParams = 0; 1001 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 1002 = ParsedTemplateInfo::NonTemplate; 1003 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 1004 = SourceLocation(); 1005 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 1006 = SourceLocation(); 1007 } 1008 } 1009 } else if (Tok.is(tok::annot_template_id)) { 1010 TemplateId = takeTemplateIdAnnotation(Tok); 1011 NameLoc = ConsumeToken(); 1012 1013 if (TemplateId->Kind != TNK_Type_template && 1014 TemplateId->Kind != TNK_Dependent_template_name) { 1015 // The template-name in the simple-template-id refers to 1016 // something other than a class template. Give an appropriate 1017 // error message and skip to the ';'. 1018 SourceRange Range(NameLoc); 1019 if (SS.isNotEmpty()) 1020 Range.setBegin(SS.getBeginLoc()); 1021 1022 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 1023 << Name << static_cast<int>(TemplateId->Kind) << Range; 1024 1025 DS.SetTypeSpecError(); 1026 SkipUntil(tok::semi, false, true); 1027 if (SuppressingAccessChecks) 1028 Actions.ActOnStopSuppressingAccessChecks(); 1029 1030 return; 1031 } 1032 } 1033 1034 // As soon as we're finished parsing the class's template-id, turn access 1035 // checking back on. 1036 if (SuppressingAccessChecks) 1037 Actions.ActOnStopSuppressingAccessChecks(); 1038 1039 // There are four options here. If we have 'struct foo;', then this 1040 // is either a forward declaration or a friend declaration, which 1041 // have to be treated differently. If we have 'struct foo {...', 1042 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1043 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1044 // However, in some contexts, things look like declarations but are just 1045 // references, e.g. 1046 // new struct s; 1047 // or 1048 // &T::operator struct s; 1049 // For these, SuppressDeclarations is true. 1050 Sema::TagUseKind TUK; 1051 if (SuppressDeclarations) 1052 TUK = Sema::TUK_Reference; 1053 else if (Tok.is(tok::l_brace) || 1054 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1055 isCXX0XFinalKeyword()) { 1056 if (DS.isFriendSpecified()) { 1057 // C++ [class.friend]p2: 1058 // A class shall not be defined in a friend declaration. 1059 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1060 << SourceRange(DS.getFriendSpecLoc()); 1061 1062 // Skip everything up to the semicolon, so that this looks like a proper 1063 // friend class (or template thereof) declaration. 1064 SkipUntil(tok::semi, true, true); 1065 TUK = Sema::TUK_Friend; 1066 } else { 1067 // Okay, this is a class definition. 1068 TUK = Sema::TUK_Definition; 1069 } 1070 } else if (Tok.is(tok::semi)) 1071 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1072 else 1073 TUK = Sema::TUK_Reference; 1074 1075 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1076 TUK != Sema::TUK_Definition)) { 1077 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1078 // We have a declaration or reference to an anonymous class. 1079 Diag(StartLoc, diag::err_anon_type_definition) 1080 << DeclSpec::getSpecifierName(TagType); 1081 } 1082 1083 SkipUntil(tok::comma, true); 1084 return; 1085 } 1086 1087 // Create the tag portion of the class or class template. 1088 DeclResult TagOrTempResult = true; // invalid 1089 TypeResult TypeResult = true; // invalid 1090 1091 bool Owned = false; 1092 if (TemplateId) { 1093 // Explicit specialization, class template partial specialization, 1094 // or explicit instantiation. 1095 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1096 TemplateId->getTemplateArgs(), 1097 TemplateId->NumArgs); 1098 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1099 TUK == Sema::TUK_Declaration) { 1100 // This is an explicit instantiation of a class template. 1101 TagOrTempResult 1102 = Actions.ActOnExplicitInstantiation(getCurScope(), 1103 TemplateInfo.ExternLoc, 1104 TemplateInfo.TemplateLoc, 1105 TagType, 1106 StartLoc, 1107 SS, 1108 TemplateId->Template, 1109 TemplateId->TemplateNameLoc, 1110 TemplateId->LAngleLoc, 1111 TemplateArgsPtr, 1112 TemplateId->RAngleLoc, 1113 attrs.getList()); 1114 1115 // Friend template-ids are treated as references unless 1116 // they have template headers, in which case they're ill-formed 1117 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1118 // We diagnose this error in ActOnClassTemplateSpecialization. 1119 } else if (TUK == Sema::TUK_Reference || 1120 (TUK == Sema::TUK_Friend && 1121 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1122 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1123 StartLoc, 1124 TemplateId->SS, 1125 TemplateId->Template, 1126 TemplateId->TemplateNameLoc, 1127 TemplateId->LAngleLoc, 1128 TemplateArgsPtr, 1129 TemplateId->RAngleLoc); 1130 } else { 1131 // This is an explicit specialization or a class template 1132 // partial specialization. 1133 TemplateParameterLists FakedParamLists; 1134 1135 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1136 // This looks like an explicit instantiation, because we have 1137 // something like 1138 // 1139 // template class Foo<X> 1140 // 1141 // but it actually has a definition. Most likely, this was 1142 // meant to be an explicit specialization, but the user forgot 1143 // the '<>' after 'template'. 1144 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1145 1146 SourceLocation LAngleLoc 1147 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1148 Diag(TemplateId->TemplateNameLoc, 1149 diag::err_explicit_instantiation_with_definition) 1150 << SourceRange(TemplateInfo.TemplateLoc) 1151 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1152 1153 // Create a fake template parameter list that contains only 1154 // "template<>", so that we treat this construct as a class 1155 // template specialization. 1156 FakedParamLists.push_back( 1157 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1158 TemplateInfo.TemplateLoc, 1159 LAngleLoc, 1160 0, 0, 1161 LAngleLoc)); 1162 TemplateParams = &FakedParamLists; 1163 } 1164 1165 // Build the class template specialization. 1166 TagOrTempResult 1167 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1168 StartLoc, DS.getModulePrivateSpecLoc(), SS, 1169 TemplateId->Template, 1170 TemplateId->TemplateNameLoc, 1171 TemplateId->LAngleLoc, 1172 TemplateArgsPtr, 1173 TemplateId->RAngleLoc, 1174 attrs.getList(), 1175 MultiTemplateParamsArg(Actions, 1176 TemplateParams? &(*TemplateParams)[0] : 0, 1177 TemplateParams? TemplateParams->size() : 0)); 1178 } 1179 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1180 TUK == Sema::TUK_Declaration) { 1181 // Explicit instantiation of a member of a class template 1182 // specialization, e.g., 1183 // 1184 // template struct Outer<int>::Inner; 1185 // 1186 TagOrTempResult 1187 = Actions.ActOnExplicitInstantiation(getCurScope(), 1188 TemplateInfo.ExternLoc, 1189 TemplateInfo.TemplateLoc, 1190 TagType, StartLoc, SS, Name, 1191 NameLoc, attrs.getList()); 1192 } else if (TUK == Sema::TUK_Friend && 1193 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1194 TagOrTempResult = 1195 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1196 TagType, StartLoc, SS, 1197 Name, NameLoc, attrs.getList(), 1198 MultiTemplateParamsArg(Actions, 1199 TemplateParams? &(*TemplateParams)[0] : 0, 1200 TemplateParams? TemplateParams->size() : 0)); 1201 } else { 1202 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1203 TUK == Sema::TUK_Definition) { 1204 // FIXME: Diagnose this particular error. 1205 } 1206 1207 bool IsDependent = false; 1208 1209 // Don't pass down template parameter lists if this is just a tag 1210 // reference. For example, we don't need the template parameters here: 1211 // template <class T> class A *makeA(T t); 1212 MultiTemplateParamsArg TParams; 1213 if (TUK != Sema::TUK_Reference && TemplateParams) 1214 TParams = 1215 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1216 1217 // Declaration or definition of a class type 1218 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1219 SS, Name, NameLoc, attrs.getList(), AS, 1220 DS.getModulePrivateSpecLoc(), 1221 TParams, Owned, IsDependent, false, 1222 false, clang::TypeResult()); 1223 1224 // If ActOnTag said the type was dependent, try again with the 1225 // less common call. 1226 if (IsDependent) { 1227 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1228 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1229 SS, Name, StartLoc, NameLoc); 1230 } 1231 } 1232 1233 // If there is a body, parse it and inform the actions module. 1234 if (TUK == Sema::TUK_Definition) { 1235 assert(Tok.is(tok::l_brace) || 1236 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1237 isCXX0XFinalKeyword()); 1238 if (getLang().CPlusPlus) 1239 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1240 else 1241 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1242 } 1243 1244 const char *PrevSpec = 0; 1245 unsigned DiagID; 1246 bool Result; 1247 if (!TypeResult.isInvalid()) { 1248 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1249 NameLoc.isValid() ? NameLoc : StartLoc, 1250 PrevSpec, DiagID, TypeResult.get()); 1251 } else if (!TagOrTempResult.isInvalid()) { 1252 Result = DS.SetTypeSpecType(TagType, StartLoc, 1253 NameLoc.isValid() ? NameLoc : StartLoc, 1254 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1255 } else { 1256 DS.SetTypeSpecError(); 1257 return; 1258 } 1259 1260 if (Result) 1261 Diag(StartLoc, DiagID) << PrevSpec; 1262 1263 // At this point, we've successfully parsed a class-specifier in 'definition' 1264 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1265 // going to look at what comes after it to improve error recovery. If an 1266 // impossible token occurs next, we assume that the programmer forgot a ; at 1267 // the end of the declaration and recover that way. 1268 // 1269 // This switch enumerates the valid "follow" set for definition. 1270 if (TUK == Sema::TUK_Definition) { 1271 bool ExpectedSemi = true; 1272 switch (Tok.getKind()) { 1273 default: break; 1274 case tok::semi: // struct foo {...} ; 1275 case tok::star: // struct foo {...} * P; 1276 case tok::amp: // struct foo {...} & R = ... 1277 case tok::identifier: // struct foo {...} V ; 1278 case tok::r_paren: //(struct foo {...} ) {4} 1279 case tok::annot_cxxscope: // struct foo {...} a:: b; 1280 case tok::annot_typename: // struct foo {...} a ::b; 1281 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1282 case tok::l_paren: // struct foo {...} ( x); 1283 case tok::comma: // __builtin_offsetof(struct foo{...} , 1284 ExpectedSemi = false; 1285 break; 1286 // Type qualifiers 1287 case tok::kw_const: // struct foo {...} const x; 1288 case tok::kw_volatile: // struct foo {...} volatile x; 1289 case tok::kw_restrict: // struct foo {...} restrict x; 1290 case tok::kw_inline: // struct foo {...} inline foo() {}; 1291 // Storage-class specifiers 1292 case tok::kw_static: // struct foo {...} static x; 1293 case tok::kw_extern: // struct foo {...} extern x; 1294 case tok::kw_typedef: // struct foo {...} typedef x; 1295 case tok::kw_register: // struct foo {...} register x; 1296 case tok::kw_auto: // struct foo {...} auto x; 1297 case tok::kw_mutable: // struct foo {...} mutable x; 1298 case tok::kw_constexpr: // struct foo {...} constexpr x; 1299 // As shown above, type qualifiers and storage class specifiers absolutely 1300 // can occur after class specifiers according to the grammar. However, 1301 // almost no one actually writes code like this. If we see one of these, 1302 // it is much more likely that someone missed a semi colon and the 1303 // type/storage class specifier we're seeing is part of the *next* 1304 // intended declaration, as in: 1305 // 1306 // struct foo { ... } 1307 // typedef int X; 1308 // 1309 // We'd really like to emit a missing semicolon error instead of emitting 1310 // an error on the 'int' saying that you can't have two type specifiers in 1311 // the same declaration of X. Because of this, we look ahead past this 1312 // token to see if it's a type specifier. If so, we know the code is 1313 // otherwise invalid, so we can produce the expected semi error. 1314 if (!isKnownToBeTypeSpecifier(NextToken())) 1315 ExpectedSemi = false; 1316 break; 1317 1318 case tok::r_brace: // struct bar { struct foo {...} } 1319 // Missing ';' at end of struct is accepted as an extension in C mode. 1320 if (!getLang().CPlusPlus) 1321 ExpectedSemi = false; 1322 break; 1323 } 1324 1325 // C++ [temp]p3 In a template-declaration which defines a class, no 1326 // declarator is permitted. 1327 if (TemplateInfo.Kind) 1328 ExpectedSemi = true; 1329 1330 if (ExpectedSemi) { 1331 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1332 TagType == DeclSpec::TST_class ? "class" 1333 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1334 // Push this token back into the preprocessor and change our current token 1335 // to ';' so that the rest of the code recovers as though there were an 1336 // ';' after the definition. 1337 PP.EnterToken(Tok); 1338 Tok.setKind(tok::semi); 1339 } 1340 } 1341} 1342 1343/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1344/// 1345/// base-clause : [C++ class.derived] 1346/// ':' base-specifier-list 1347/// base-specifier-list: 1348/// base-specifier '...'[opt] 1349/// base-specifier-list ',' base-specifier '...'[opt] 1350void Parser::ParseBaseClause(Decl *ClassDecl) { 1351 assert(Tok.is(tok::colon) && "Not a base clause"); 1352 ConsumeToken(); 1353 1354 // Build up an array of parsed base specifiers. 1355 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1356 1357 while (true) { 1358 // Parse a base-specifier. 1359 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1360 if (Result.isInvalid()) { 1361 // Skip the rest of this base specifier, up until the comma or 1362 // opening brace. 1363 SkipUntil(tok::comma, tok::l_brace, true, true); 1364 } else { 1365 // Add this to our array of base specifiers. 1366 BaseInfo.push_back(Result.get()); 1367 } 1368 1369 // If the next token is a comma, consume it and keep reading 1370 // base-specifiers. 1371 if (Tok.isNot(tok::comma)) break; 1372 1373 // Consume the comma. 1374 ConsumeToken(); 1375 } 1376 1377 // Attach the base specifiers 1378 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1379} 1380 1381/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1382/// one entry in the base class list of a class specifier, for example: 1383/// class foo : public bar, virtual private baz { 1384/// 'public bar' and 'virtual private baz' are each base-specifiers. 1385/// 1386/// base-specifier: [C++ class.derived] 1387/// ::[opt] nested-name-specifier[opt] class-name 1388/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1389/// base-type-specifier 1390/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1391/// base-type-specifier 1392Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1393 bool IsVirtual = false; 1394 SourceLocation StartLoc = Tok.getLocation(); 1395 1396 // Parse the 'virtual' keyword. 1397 if (Tok.is(tok::kw_virtual)) { 1398 ConsumeToken(); 1399 IsVirtual = true; 1400 } 1401 1402 // Parse an (optional) access specifier. 1403 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1404 if (Access != AS_none) 1405 ConsumeToken(); 1406 1407 // Parse the 'virtual' keyword (again!), in case it came after the 1408 // access specifier. 1409 if (Tok.is(tok::kw_virtual)) { 1410 SourceLocation VirtualLoc = ConsumeToken(); 1411 if (IsVirtual) { 1412 // Complain about duplicate 'virtual' 1413 Diag(VirtualLoc, diag::err_dup_virtual) 1414 << FixItHint::CreateRemoval(VirtualLoc); 1415 } 1416 1417 IsVirtual = true; 1418 } 1419 1420 // Parse the class-name. 1421 SourceLocation EndLocation; 1422 SourceLocation BaseLoc; 1423 TypeResult BaseType = ParseBaseTypeSpecifier(BaseLoc, EndLocation); 1424 if (BaseType.isInvalid()) 1425 return true; 1426 1427 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1428 // actually part of the base-specifier-list grammar productions, but we 1429 // parse it here for convenience. 1430 SourceLocation EllipsisLoc; 1431 if (Tok.is(tok::ellipsis)) 1432 EllipsisLoc = ConsumeToken(); 1433 1434 // Find the complete source range for the base-specifier. 1435 SourceRange Range(StartLoc, EndLocation); 1436 1437 // Notify semantic analysis that we have parsed a complete 1438 // base-specifier. 1439 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1440 BaseType.get(), BaseLoc, EllipsisLoc); 1441} 1442 1443/// getAccessSpecifierIfPresent - Determine whether the next token is 1444/// a C++ access-specifier. 1445/// 1446/// access-specifier: [C++ class.derived] 1447/// 'private' 1448/// 'protected' 1449/// 'public' 1450AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1451 switch (Tok.getKind()) { 1452 default: return AS_none; 1453 case tok::kw_private: return AS_private; 1454 case tok::kw_protected: return AS_protected; 1455 case tok::kw_public: return AS_public; 1456 } 1457} 1458 1459void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1460 Decl *ThisDecl) { 1461 // We just declared a member function. If this member function 1462 // has any default arguments, we'll need to parse them later. 1463 LateParsedMethodDeclaration *LateMethod = 0; 1464 DeclaratorChunk::FunctionTypeInfo &FTI 1465 = DeclaratorInfo.getFunctionTypeInfo(); 1466 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1467 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1468 if (!LateMethod) { 1469 // Push this method onto the stack of late-parsed method 1470 // declarations. 1471 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1472 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1473 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1474 1475 // Add all of the parameters prior to this one (they don't 1476 // have default arguments). 1477 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1478 for (unsigned I = 0; I < ParamIdx; ++I) 1479 LateMethod->DefaultArgs.push_back( 1480 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1481 } 1482 1483 // Add this parameter to the list of parameters (it or may 1484 // not have a default argument). 1485 LateMethod->DefaultArgs.push_back( 1486 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1487 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1488 } 1489 } 1490} 1491 1492/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1493/// virt-specifier. 1494/// 1495/// virt-specifier: 1496/// override 1497/// final 1498VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1499 if (!getLang().CPlusPlus) 1500 return VirtSpecifiers::VS_None; 1501 1502 if (Tok.is(tok::identifier)) { 1503 IdentifierInfo *II = Tok.getIdentifierInfo(); 1504 1505 // Initialize the contextual keywords. 1506 if (!Ident_final) { 1507 Ident_final = &PP.getIdentifierTable().get("final"); 1508 Ident_override = &PP.getIdentifierTable().get("override"); 1509 } 1510 1511 if (II == Ident_override) 1512 return VirtSpecifiers::VS_Override; 1513 1514 if (II == Ident_final) 1515 return VirtSpecifiers::VS_Final; 1516 } 1517 1518 return VirtSpecifiers::VS_None; 1519} 1520 1521/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1522/// 1523/// virt-specifier-seq: 1524/// virt-specifier 1525/// virt-specifier-seq virt-specifier 1526void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1527 while (true) { 1528 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1529 if (Specifier == VirtSpecifiers::VS_None) 1530 return; 1531 1532 // C++ [class.mem]p8: 1533 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1534 const char *PrevSpec = 0; 1535 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1536 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1537 << PrevSpec 1538 << FixItHint::CreateRemoval(Tok.getLocation()); 1539 1540 Diag(Tok.getLocation(), getLang().CPlusPlus0x ? 1541 diag::warn_cxx98_compat_override_control_keyword : 1542 diag::ext_override_control_keyword) 1543 << VirtSpecifiers::getSpecifierName(Specifier); 1544 ConsumeToken(); 1545 } 1546} 1547 1548/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1549/// contextual 'final' keyword. 1550bool Parser::isCXX0XFinalKeyword() const { 1551 if (!getLang().CPlusPlus) 1552 return false; 1553 1554 if (!Tok.is(tok::identifier)) 1555 return false; 1556 1557 // Initialize the contextual keywords. 1558 if (!Ident_final) { 1559 Ident_final = &PP.getIdentifierTable().get("final"); 1560 Ident_override = &PP.getIdentifierTable().get("override"); 1561 } 1562 1563 return Tok.getIdentifierInfo() == Ident_final; 1564} 1565 1566/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1567/// 1568/// member-declaration: 1569/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1570/// function-definition ';'[opt] 1571/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1572/// using-declaration [TODO] 1573/// [C++0x] static_assert-declaration 1574/// template-declaration 1575/// [GNU] '__extension__' member-declaration 1576/// 1577/// member-declarator-list: 1578/// member-declarator 1579/// member-declarator-list ',' member-declarator 1580/// 1581/// member-declarator: 1582/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1583/// declarator constant-initializer[opt] 1584/// [C++11] declarator brace-or-equal-initializer[opt] 1585/// identifier[opt] ':' constant-expression 1586/// 1587/// virt-specifier-seq: 1588/// virt-specifier 1589/// virt-specifier-seq virt-specifier 1590/// 1591/// virt-specifier: 1592/// override 1593/// final 1594/// 1595/// pure-specifier: 1596/// '= 0' 1597/// 1598/// constant-initializer: 1599/// '=' constant-expression 1600/// 1601void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1602 AttributeList *AccessAttrs, 1603 const ParsedTemplateInfo &TemplateInfo, 1604 ParsingDeclRAIIObject *TemplateDiags) { 1605 if (Tok.is(tok::at)) { 1606 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1607 Diag(Tok, diag::err_at_defs_cxx); 1608 else 1609 Diag(Tok, diag::err_at_in_class); 1610 1611 ConsumeToken(); 1612 SkipUntil(tok::r_brace); 1613 return; 1614 } 1615 1616 // Access declarations. 1617 if (!TemplateInfo.Kind && 1618 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1619 !TryAnnotateCXXScopeToken() && 1620 Tok.is(tok::annot_cxxscope)) { 1621 bool isAccessDecl = false; 1622 if (NextToken().is(tok::identifier)) 1623 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1624 else 1625 isAccessDecl = NextToken().is(tok::kw_operator); 1626 1627 if (isAccessDecl) { 1628 // Collect the scope specifier token we annotated earlier. 1629 CXXScopeSpec SS; 1630 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1631 1632 // Try to parse an unqualified-id. 1633 UnqualifiedId Name; 1634 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1635 SkipUntil(tok::semi); 1636 return; 1637 } 1638 1639 // TODO: recover from mistakenly-qualified operator declarations. 1640 if (ExpectAndConsume(tok::semi, 1641 diag::err_expected_semi_after, 1642 "access declaration", 1643 tok::semi)) 1644 return; 1645 1646 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1647 false, SourceLocation(), 1648 SS, Name, 1649 /* AttrList */ 0, 1650 /* IsTypeName */ false, 1651 SourceLocation()); 1652 return; 1653 } 1654 } 1655 1656 // static_assert-declaration 1657 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1658 // FIXME: Check for templates 1659 SourceLocation DeclEnd; 1660 ParseStaticAssertDeclaration(DeclEnd); 1661 return; 1662 } 1663 1664 if (Tok.is(tok::kw_template)) { 1665 assert(!TemplateInfo.TemplateParams && 1666 "Nested template improperly parsed?"); 1667 SourceLocation DeclEnd; 1668 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1669 AS, AccessAttrs); 1670 return; 1671 } 1672 1673 // Handle: member-declaration ::= '__extension__' member-declaration 1674 if (Tok.is(tok::kw___extension__)) { 1675 // __extension__ silences extension warnings in the subexpression. 1676 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1677 ConsumeToken(); 1678 return ParseCXXClassMemberDeclaration(AS, AccessAttrs, 1679 TemplateInfo, TemplateDiags); 1680 } 1681 1682 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1683 // is a bitfield. 1684 ColonProtectionRAIIObject X(*this); 1685 1686 ParsedAttributesWithRange attrs(AttrFactory); 1687 // Optional C++0x attribute-specifier 1688 MaybeParseCXX0XAttributes(attrs); 1689 MaybeParseMicrosoftAttributes(attrs); 1690 1691 if (Tok.is(tok::kw_using)) { 1692 ProhibitAttributes(attrs); 1693 1694 // Eat 'using'. 1695 SourceLocation UsingLoc = ConsumeToken(); 1696 1697 if (Tok.is(tok::kw_namespace)) { 1698 Diag(UsingLoc, diag::err_using_namespace_in_class); 1699 SkipUntil(tok::semi, true, true); 1700 } else { 1701 SourceLocation DeclEnd; 1702 // Otherwise, it must be a using-declaration or an alias-declaration. 1703 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1704 UsingLoc, DeclEnd, AS); 1705 } 1706 return; 1707 } 1708 1709 // decl-specifier-seq: 1710 // Parse the common declaration-specifiers piece. 1711 ParsingDeclSpec DS(*this, TemplateDiags); 1712 DS.takeAttributesFrom(attrs); 1713 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1714 1715 MultiTemplateParamsArg TemplateParams(Actions, 1716 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1717 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1718 1719 if (Tok.is(tok::semi)) { 1720 ConsumeToken(); 1721 Decl *TheDecl = 1722 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1723 DS.complete(TheDecl); 1724 return; 1725 } 1726 1727 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1728 VirtSpecifiers VS; 1729 1730 // Hold late-parsed attributes so we can attach a Decl to them later. 1731 LateParsedAttrList LateParsedAttrs; 1732 1733 SourceLocation EqualLoc; 1734 bool HasInitializer = false; 1735 ExprResult Init; 1736 if (Tok.isNot(tok::colon)) { 1737 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1738 ColonProtectionRAIIObject X(*this); 1739 1740 // Parse the first declarator. 1741 ParseDeclarator(DeclaratorInfo); 1742 // Error parsing the declarator? 1743 if (!DeclaratorInfo.hasName()) { 1744 // If so, skip until the semi-colon or a }. 1745 SkipUntil(tok::r_brace, true, true); 1746 if (Tok.is(tok::semi)) 1747 ConsumeToken(); 1748 return; 1749 } 1750 1751 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1752 1753 // If attributes exist after the declarator, but before an '{', parse them. 1754 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1755 1756 // MSVC permits pure specifier on inline functions declared at class scope. 1757 // Hence check for =0 before checking for function definition. 1758 if (getLang().MicrosoftExt && Tok.is(tok::equal) && 1759 DeclaratorInfo.isFunctionDeclarator() && 1760 NextToken().is(tok::numeric_constant)) { 1761 EqualLoc = ConsumeToken(); 1762 Init = ParseInitializer(); 1763 if (Init.isInvalid()) 1764 SkipUntil(tok::comma, true, true); 1765 else 1766 HasInitializer = true; 1767 } 1768 1769 bool IsDefinition = false; 1770 // function-definition: 1771 // 1772 // In C++11, a non-function declarator followed by an open brace is a 1773 // braced-init-list for an in-class member initialization, not an 1774 // erroneous function definition. 1775 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1776 IsDefinition = true; 1777 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1778 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1779 IsDefinition = true; 1780 } else if (Tok.is(tok::equal)) { 1781 const Token &KW = NextToken(); 1782 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1783 IsDefinition = true; 1784 } 1785 } 1786 1787 if (IsDefinition) { 1788 if (!DeclaratorInfo.isFunctionDeclarator()) { 1789 Diag(Tok, diag::err_func_def_no_params); 1790 ConsumeBrace(); 1791 SkipUntil(tok::r_brace, true); 1792 1793 // Consume the optional ';' 1794 if (Tok.is(tok::semi)) 1795 ConsumeToken(); 1796 return; 1797 } 1798 1799 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1800 Diag(Tok, diag::err_function_declared_typedef); 1801 // This recovery skips the entire function body. It would be nice 1802 // to simply call ParseCXXInlineMethodDef() below, however Sema 1803 // assumes the declarator represents a function, not a typedef. 1804 ConsumeBrace(); 1805 SkipUntil(tok::r_brace, true); 1806 1807 // Consume the optional ';' 1808 if (Tok.is(tok::semi)) 1809 ConsumeToken(); 1810 return; 1811 } 1812 1813 Decl *FunDecl = 1814 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo, 1815 VS, Init); 1816 1817 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1818 LateParsedAttrs[i]->setDecl(FunDecl); 1819 } 1820 LateParsedAttrs.clear(); 1821 1822 // Consume the ';' - it's optional unless we have a delete or default 1823 if (Tok.is(tok::semi)) { 1824 ConsumeToken(); 1825 } 1826 1827 return; 1828 } 1829 } 1830 1831 // member-declarator-list: 1832 // member-declarator 1833 // member-declarator-list ',' member-declarator 1834 1835 SmallVector<Decl *, 8> DeclsInGroup; 1836 ExprResult BitfieldSize; 1837 1838 while (1) { 1839 // member-declarator: 1840 // declarator pure-specifier[opt] 1841 // declarator brace-or-equal-initializer[opt] 1842 // identifier[opt] ':' constant-expression 1843 if (Tok.is(tok::colon)) { 1844 ConsumeToken(); 1845 BitfieldSize = ParseConstantExpression(); 1846 if (BitfieldSize.isInvalid()) 1847 SkipUntil(tok::comma, true, true); 1848 } 1849 1850 // If a simple-asm-expr is present, parse it. 1851 if (Tok.is(tok::kw_asm)) { 1852 SourceLocation Loc; 1853 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1854 if (AsmLabel.isInvalid()) 1855 SkipUntil(tok::comma, true, true); 1856 1857 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1858 DeclaratorInfo.SetRangeEnd(Loc); 1859 } 1860 1861 // If attributes exist after the declarator, parse them. 1862 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1863 1864 // FIXME: When g++ adds support for this, we'll need to check whether it 1865 // goes before or after the GNU attributes and __asm__. 1866 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1867 1868 bool HasDeferredInitializer = false; 1869 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) { 1870 if (BitfieldSize.get()) { 1871 Diag(Tok, diag::err_bitfield_member_init); 1872 SkipUntil(tok::comma, true, true); 1873 } else { 1874 HasInitializer = true; 1875 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1876 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1877 != DeclSpec::SCS_static && 1878 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1879 != DeclSpec::SCS_typedef; 1880 } 1881 } 1882 1883 // NOTE: If Sema is the Action module and declarator is an instance field, 1884 // this call will *not* return the created decl; It will return null. 1885 // See Sema::ActOnCXXMemberDeclarator for details. 1886 1887 Decl *ThisDecl = 0; 1888 if (DS.isFriendSpecified()) { 1889 // TODO: handle initializers, bitfields, 'delete' 1890 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1891 move(TemplateParams)); 1892 } else { 1893 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1894 DeclaratorInfo, 1895 move(TemplateParams), 1896 BitfieldSize.release(), 1897 VS, HasDeferredInitializer); 1898 if (AccessAttrs) 1899 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs, 1900 false, true); 1901 } 1902 1903 // Set the Decl for any late parsed attributes 1904 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1905 LateParsedAttrs[i]->setDecl(ThisDecl); 1906 } 1907 LateParsedAttrs.clear(); 1908 1909 // Handle the initializer. 1910 if (HasDeferredInitializer) { 1911 // The initializer was deferred; parse it and cache the tokens. 1912 Diag(Tok, getLang().CPlusPlus0x ? 1913 diag::warn_cxx98_compat_nonstatic_member_init : 1914 diag::ext_nonstatic_member_init); 1915 1916 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1917 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1918 // declarator is followed by an initializer. 1919 // 1920 // A brace-or-equal-initializer for a member-declarator is not an 1921 // initializer in the gramamr, so this is ill-formed. 1922 Diag(Tok, diag::err_incomplete_array_member_init); 1923 SkipUntil(tok::comma, true, true); 1924 // Avoid later warnings about a class member of incomplete type. 1925 ThisDecl->setInvalidDecl(); 1926 } else 1927 ParseCXXNonStaticMemberInitializer(ThisDecl); 1928 } else if (HasInitializer) { 1929 // Normal initializer. 1930 if (!Init.isUsable()) 1931 Init = ParseCXXMemberInitializer( 1932 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 1933 1934 if (Init.isInvalid()) 1935 SkipUntil(tok::comma, true, true); 1936 else if (ThisDecl) 1937 Actions.AddInitializerToDecl(ThisDecl, Init.get(), false, 1938 DS.getTypeSpecType() == DeclSpec::TST_auto); 1939 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1940 // No initializer. 1941 Actions.ActOnUninitializedDecl(ThisDecl, 1942 DS.getTypeSpecType() == DeclSpec::TST_auto); 1943 } 1944 1945 if (ThisDecl) { 1946 Actions.FinalizeDeclaration(ThisDecl); 1947 DeclsInGroup.push_back(ThisDecl); 1948 } 1949 1950 if (DeclaratorInfo.isFunctionDeclarator() && 1951 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1952 != DeclSpec::SCS_typedef) { 1953 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1954 } 1955 1956 DeclaratorInfo.complete(ThisDecl); 1957 1958 // If we don't have a comma, it is either the end of the list (a ';') 1959 // or an error, bail out. 1960 if (Tok.isNot(tok::comma)) 1961 break; 1962 1963 // Consume the comma. 1964 ConsumeToken(); 1965 1966 // Parse the next declarator. 1967 DeclaratorInfo.clear(); 1968 VS.clear(); 1969 BitfieldSize = true; 1970 Init = true; 1971 HasInitializer = false; 1972 1973 // Attributes are only allowed on the second declarator. 1974 MaybeParseGNUAttributes(DeclaratorInfo); 1975 1976 if (Tok.isNot(tok::colon)) 1977 ParseDeclarator(DeclaratorInfo); 1978 } 1979 1980 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1981 // Skip to end of block or statement. 1982 SkipUntil(tok::r_brace, true, true); 1983 // If we stopped at a ';', eat it. 1984 if (Tok.is(tok::semi)) ConsumeToken(); 1985 return; 1986 } 1987 1988 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1989 DeclsInGroup.size()); 1990} 1991 1992/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1993/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1994/// function definition. The location of the '=', if any, will be placed in 1995/// EqualLoc. 1996/// 1997/// pure-specifier: 1998/// '= 0' 1999/// 2000/// brace-or-equal-initializer: 2001/// '=' initializer-expression 2002/// braced-init-list [TODO] 2003/// 2004/// initializer-clause: 2005/// assignment-expression 2006/// braced-init-list [TODO] 2007/// 2008/// defaulted/deleted function-definition: 2009/// '=' 'default' 2010/// '=' 'delete' 2011/// 2012/// Prior to C++0x, the assignment-expression in an initializer-clause must 2013/// be a constant-expression. 2014ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 2015 SourceLocation &EqualLoc) { 2016 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 2017 && "Data member initializer not starting with '=' or '{'"); 2018 2019 if (Tok.is(tok::equal)) { 2020 EqualLoc = ConsumeToken(); 2021 if (Tok.is(tok::kw_delete)) { 2022 // In principle, an initializer of '= delete p;' is legal, but it will 2023 // never type-check. It's better to diagnose it as an ill-formed expression 2024 // than as an ill-formed deleted non-function member. 2025 // An initializer of '= delete p, foo' will never be parsed, because 2026 // a top-level comma always ends the initializer expression. 2027 const Token &Next = NextToken(); 2028 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 2029 Next.is(tok::eof)) { 2030 if (IsFunction) 2031 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 2032 << 1 /* delete */; 2033 else 2034 Diag(ConsumeToken(), diag::err_deleted_non_function); 2035 return ExprResult(); 2036 } 2037 } else if (Tok.is(tok::kw_default)) { 2038 if (IsFunction) 2039 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2040 << 0 /* default */; 2041 else 2042 Diag(ConsumeToken(), diag::err_default_special_members); 2043 return ExprResult(); 2044 } 2045 2046 return ParseInitializer(); 2047 } else 2048 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 2049} 2050 2051/// ParseCXXMemberSpecification - Parse the class definition. 2052/// 2053/// member-specification: 2054/// member-declaration member-specification[opt] 2055/// access-specifier ':' member-specification[opt] 2056/// 2057void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2058 unsigned TagType, Decl *TagDecl) { 2059 assert((TagType == DeclSpec::TST_struct || 2060 TagType == DeclSpec::TST_union || 2061 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2062 2063 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2064 "parsing struct/union/class body"); 2065 2066 // Determine whether this is a non-nested class. Note that local 2067 // classes are *not* considered to be nested classes. 2068 bool NonNestedClass = true; 2069 if (!ClassStack.empty()) { 2070 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2071 if (S->isClassScope()) { 2072 // We're inside a class scope, so this is a nested class. 2073 NonNestedClass = false; 2074 break; 2075 } 2076 2077 if ((S->getFlags() & Scope::FnScope)) { 2078 // If we're in a function or function template declared in the 2079 // body of a class, then this is a local class rather than a 2080 // nested class. 2081 const Scope *Parent = S->getParent(); 2082 if (Parent->isTemplateParamScope()) 2083 Parent = Parent->getParent(); 2084 if (Parent->isClassScope()) 2085 break; 2086 } 2087 } 2088 } 2089 2090 // Enter a scope for the class. 2091 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2092 2093 // Note that we are parsing a new (potentially-nested) class definition. 2094 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2095 2096 if (TagDecl) 2097 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2098 2099 SourceLocation FinalLoc; 2100 2101 // Parse the optional 'final' keyword. 2102 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2103 assert(isCXX0XFinalKeyword() && "not a class definition"); 2104 FinalLoc = ConsumeToken(); 2105 2106 Diag(FinalLoc, getLang().CPlusPlus0x ? 2107 diag::warn_cxx98_compat_override_control_keyword : 2108 diag::ext_override_control_keyword) << "final"; 2109 } 2110 2111 if (Tok.is(tok::colon)) { 2112 ParseBaseClause(TagDecl); 2113 2114 if (!Tok.is(tok::l_brace)) { 2115 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2116 2117 if (TagDecl) 2118 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2119 return; 2120 } 2121 } 2122 2123 assert(Tok.is(tok::l_brace)); 2124 BalancedDelimiterTracker T(*this, tok::l_brace); 2125 T.consumeOpen(); 2126 2127 if (TagDecl) 2128 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2129 T.getOpenLocation()); 2130 2131 // C++ 11p3: Members of a class defined with the keyword class are private 2132 // by default. Members of a class defined with the keywords struct or union 2133 // are public by default. 2134 AccessSpecifier CurAS; 2135 if (TagType == DeclSpec::TST_class) 2136 CurAS = AS_private; 2137 else 2138 CurAS = AS_public; 2139 ParsedAttributes AccessAttrs(AttrFactory); 2140 2141 if (TagDecl) { 2142 // While we still have something to read, read the member-declarations. 2143 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2144 // Each iteration of this loop reads one member-declaration. 2145 2146 if (getLang().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2147 Tok.is(tok::kw___if_not_exists))) { 2148 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2149 continue; 2150 } 2151 2152 // Check for extraneous top-level semicolon. 2153 if (Tok.is(tok::semi)) { 2154 Diag(Tok, diag::ext_extra_struct_semi) 2155 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2156 << FixItHint::CreateRemoval(Tok.getLocation()); 2157 ConsumeToken(); 2158 continue; 2159 } 2160 2161 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2162 if (AS != AS_none) { 2163 // Current token is a C++ access specifier. 2164 CurAS = AS; 2165 SourceLocation ASLoc = Tok.getLocation(); 2166 unsigned TokLength = Tok.getLength(); 2167 ConsumeToken(); 2168 AccessAttrs.clear(); 2169 MaybeParseGNUAttributes(AccessAttrs); 2170 2171 SourceLocation EndLoc; 2172 if (Tok.is(tok::colon)) { 2173 EndLoc = Tok.getLocation(); 2174 ConsumeToken(); 2175 } else if (Tok.is(tok::semi)) { 2176 EndLoc = Tok.getLocation(); 2177 ConsumeToken(); 2178 Diag(EndLoc, diag::err_expected_colon) 2179 << FixItHint::CreateReplacement(EndLoc, ":"); 2180 } else { 2181 EndLoc = ASLoc.getLocWithOffset(TokLength); 2182 Diag(EndLoc, diag::err_expected_colon) 2183 << FixItHint::CreateInsertion(EndLoc, ":"); 2184 } 2185 2186 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc, 2187 AccessAttrs.getList())) { 2188 // found another attribute than only annotations 2189 AccessAttrs.clear(); 2190 } 2191 2192 continue; 2193 } 2194 2195 // FIXME: Make sure we don't have a template here. 2196 2197 // Parse all the comma separated declarators. 2198 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList()); 2199 } 2200 2201 T.consumeClose(); 2202 } else { 2203 SkipUntil(tok::r_brace, false, false); 2204 } 2205 2206 // If attributes exist after class contents, parse them. 2207 ParsedAttributes attrs(AttrFactory); 2208 MaybeParseGNUAttributes(attrs); 2209 2210 if (TagDecl) 2211 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2212 T.getOpenLocation(), 2213 T.getCloseLocation(), 2214 attrs.getList()); 2215 2216 // C++0x [class.mem]p2: Within the class member-specification, the class is 2217 // regarded as complete within function bodies, default arguments, exception- 2218 // specifications, and brace-or-equal-initializers for non-static data 2219 // members (including such things in nested classes). 2220 // 2221 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2222 // handled. Fix the others! 2223 if (TagDecl && NonNestedClass) { 2224 // We are not inside a nested class. This class and its nested classes 2225 // are complete and we can parse the delayed portions of method 2226 // declarations and the lexed inline method definitions, along with any 2227 // delayed attributes. 2228 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2229 ParseLexedAttributes(getCurrentClass()); 2230 ParseLexedMethodDeclarations(getCurrentClass()); 2231 ParseLexedMemberInitializers(getCurrentClass()); 2232 ParseLexedMethodDefs(getCurrentClass()); 2233 PrevTokLocation = SavedPrevTokLocation; 2234 } 2235 2236 if (TagDecl) 2237 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 2238 T.getCloseLocation()); 2239 2240 // Leave the class scope. 2241 ParsingDef.Pop(); 2242 ClassScope.Exit(); 2243} 2244 2245/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2246/// which explicitly initializes the members or base classes of a 2247/// class (C++ [class.base.init]). For example, the three initializers 2248/// after the ':' in the Derived constructor below: 2249/// 2250/// @code 2251/// class Base { }; 2252/// class Derived : Base { 2253/// int x; 2254/// float f; 2255/// public: 2256/// Derived(float f) : Base(), x(17), f(f) { } 2257/// }; 2258/// @endcode 2259/// 2260/// [C++] ctor-initializer: 2261/// ':' mem-initializer-list 2262/// 2263/// [C++] mem-initializer-list: 2264/// mem-initializer ...[opt] 2265/// mem-initializer ...[opt] , mem-initializer-list 2266void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2267 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2268 2269 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2270 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2271 SourceLocation ColonLoc = ConsumeToken(); 2272 2273 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2274 bool AnyErrors = false; 2275 2276 do { 2277 if (Tok.is(tok::code_completion)) { 2278 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2279 MemInitializers.data(), 2280 MemInitializers.size()); 2281 return cutOffParsing(); 2282 } else { 2283 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2284 if (!MemInit.isInvalid()) 2285 MemInitializers.push_back(MemInit.get()); 2286 else 2287 AnyErrors = true; 2288 } 2289 2290 if (Tok.is(tok::comma)) 2291 ConsumeToken(); 2292 else if (Tok.is(tok::l_brace)) 2293 break; 2294 // If the next token looks like a base or member initializer, assume that 2295 // we're just missing a comma. 2296 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2297 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2298 Diag(Loc, diag::err_ctor_init_missing_comma) 2299 << FixItHint::CreateInsertion(Loc, ", "); 2300 } else { 2301 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2302 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2303 SkipUntil(tok::l_brace, true, true); 2304 break; 2305 } 2306 } while (true); 2307 2308 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2309 MemInitializers.data(), MemInitializers.size(), 2310 AnyErrors); 2311} 2312 2313/// ParseMemInitializer - Parse a C++ member initializer, which is 2314/// part of a constructor initializer that explicitly initializes one 2315/// member or base class (C++ [class.base.init]). See 2316/// ParseConstructorInitializer for an example. 2317/// 2318/// [C++] mem-initializer: 2319/// mem-initializer-id '(' expression-list[opt] ')' 2320/// [C++0x] mem-initializer-id braced-init-list 2321/// 2322/// [C++] mem-initializer-id: 2323/// '::'[opt] nested-name-specifier[opt] class-name 2324/// identifier 2325Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2326 // parse '::'[opt] nested-name-specifier[opt] 2327 CXXScopeSpec SS; 2328 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2329 ParsedType TemplateTypeTy; 2330 if (Tok.is(tok::annot_template_id)) { 2331 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2332 if (TemplateId->Kind == TNK_Type_template || 2333 TemplateId->Kind == TNK_Dependent_template_name) { 2334 AnnotateTemplateIdTokenAsType(); 2335 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2336 TemplateTypeTy = getTypeAnnotation(Tok); 2337 } 2338 } 2339 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2340 Diag(Tok, diag::err_expected_member_or_base_name); 2341 return true; 2342 } 2343 2344 // Get the identifier. This may be a member name or a class name, 2345 // but we'll let the semantic analysis determine which it is. 2346 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2347 SourceLocation IdLoc = ConsumeToken(); 2348 2349 // Parse the '('. 2350 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2351 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2352 2353 ExprResult InitList = ParseBraceInitializer(); 2354 if (InitList.isInvalid()) 2355 return true; 2356 2357 SourceLocation EllipsisLoc; 2358 if (Tok.is(tok::ellipsis)) 2359 EllipsisLoc = ConsumeToken(); 2360 2361 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2362 TemplateTypeTy, IdLoc, InitList.take(), 2363 EllipsisLoc); 2364 } else if(Tok.is(tok::l_paren)) { 2365 BalancedDelimiterTracker T(*this, tok::l_paren); 2366 T.consumeOpen(); 2367 2368 // Parse the optional expression-list. 2369 ExprVector ArgExprs(Actions); 2370 CommaLocsTy CommaLocs; 2371 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2372 SkipUntil(tok::r_paren); 2373 return true; 2374 } 2375 2376 T.consumeClose(); 2377 2378 SourceLocation EllipsisLoc; 2379 if (Tok.is(tok::ellipsis)) 2380 EllipsisLoc = ConsumeToken(); 2381 2382 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2383 TemplateTypeTy, IdLoc, 2384 T.getOpenLocation(), ArgExprs.take(), 2385 ArgExprs.size(), T.getCloseLocation(), 2386 EllipsisLoc); 2387 } 2388 2389 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2390 : diag::err_expected_lparen); 2391 return true; 2392} 2393 2394/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2395/// 2396/// exception-specification: 2397/// dynamic-exception-specification 2398/// noexcept-specification 2399/// 2400/// noexcept-specification: 2401/// 'noexcept' 2402/// 'noexcept' '(' constant-expression ')' 2403ExceptionSpecificationType 2404Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2405 SmallVectorImpl<ParsedType> &DynamicExceptions, 2406 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2407 ExprResult &NoexceptExpr) { 2408 ExceptionSpecificationType Result = EST_None; 2409 2410 // See if there's a dynamic specification. 2411 if (Tok.is(tok::kw_throw)) { 2412 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2413 DynamicExceptions, 2414 DynamicExceptionRanges); 2415 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2416 "Produced different number of exception types and ranges."); 2417 } 2418 2419 // If there's no noexcept specification, we're done. 2420 if (Tok.isNot(tok::kw_noexcept)) 2421 return Result; 2422 2423 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); 2424 2425 // If we already had a dynamic specification, parse the noexcept for, 2426 // recovery, but emit a diagnostic and don't store the results. 2427 SourceRange NoexceptRange; 2428 ExceptionSpecificationType NoexceptType = EST_None; 2429 2430 SourceLocation KeywordLoc = ConsumeToken(); 2431 if (Tok.is(tok::l_paren)) { 2432 // There is an argument. 2433 BalancedDelimiterTracker T(*this, tok::l_paren); 2434 T.consumeOpen(); 2435 NoexceptType = EST_ComputedNoexcept; 2436 NoexceptExpr = ParseConstantExpression(); 2437 // The argument must be contextually convertible to bool. We use 2438 // ActOnBooleanCondition for this purpose. 2439 if (!NoexceptExpr.isInvalid()) 2440 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2441 NoexceptExpr.get()); 2442 T.consumeClose(); 2443 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); 2444 } else { 2445 // There is no argument. 2446 NoexceptType = EST_BasicNoexcept; 2447 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2448 } 2449 2450 if (Result == EST_None) { 2451 SpecificationRange = NoexceptRange; 2452 Result = NoexceptType; 2453 2454 // If there's a dynamic specification after a noexcept specification, 2455 // parse that and ignore the results. 2456 if (Tok.is(tok::kw_throw)) { 2457 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2458 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2459 DynamicExceptionRanges); 2460 } 2461 } else { 2462 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2463 } 2464 2465 return Result; 2466} 2467 2468/// ParseDynamicExceptionSpecification - Parse a C++ 2469/// dynamic-exception-specification (C++ [except.spec]). 2470/// 2471/// dynamic-exception-specification: 2472/// 'throw' '(' type-id-list [opt] ')' 2473/// [MS] 'throw' '(' '...' ')' 2474/// 2475/// type-id-list: 2476/// type-id ... [opt] 2477/// type-id-list ',' type-id ... [opt] 2478/// 2479ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2480 SourceRange &SpecificationRange, 2481 SmallVectorImpl<ParsedType> &Exceptions, 2482 SmallVectorImpl<SourceRange> &Ranges) { 2483 assert(Tok.is(tok::kw_throw) && "expected throw"); 2484 2485 SpecificationRange.setBegin(ConsumeToken()); 2486 BalancedDelimiterTracker T(*this, tok::l_paren); 2487 if (T.consumeOpen()) { 2488 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2489 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2490 return EST_DynamicNone; 2491 } 2492 2493 // Parse throw(...), a Microsoft extension that means "this function 2494 // can throw anything". 2495 if (Tok.is(tok::ellipsis)) { 2496 SourceLocation EllipsisLoc = ConsumeToken(); 2497 if (!getLang().MicrosoftExt) 2498 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2499 T.consumeClose(); 2500 SpecificationRange.setEnd(T.getCloseLocation()); 2501 return EST_MSAny; 2502 } 2503 2504 // Parse the sequence of type-ids. 2505 SourceRange Range; 2506 while (Tok.isNot(tok::r_paren)) { 2507 TypeResult Res(ParseTypeName(&Range)); 2508 2509 if (Tok.is(tok::ellipsis)) { 2510 // C++0x [temp.variadic]p5: 2511 // - In a dynamic-exception-specification (15.4); the pattern is a 2512 // type-id. 2513 SourceLocation Ellipsis = ConsumeToken(); 2514 Range.setEnd(Ellipsis); 2515 if (!Res.isInvalid()) 2516 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2517 } 2518 2519 if (!Res.isInvalid()) { 2520 Exceptions.push_back(Res.get()); 2521 Ranges.push_back(Range); 2522 } 2523 2524 if (Tok.is(tok::comma)) 2525 ConsumeToken(); 2526 else 2527 break; 2528 } 2529 2530 T.consumeClose(); 2531 SpecificationRange.setEnd(T.getCloseLocation()); 2532 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2533} 2534 2535/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2536/// function declaration. 2537TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2538 assert(Tok.is(tok::arrow) && "expected arrow"); 2539 2540 ConsumeToken(); 2541 2542 // FIXME: Need to suppress declarations when parsing this typename. 2543 // Otherwise in this function definition: 2544 // 2545 // auto f() -> struct X {} 2546 // 2547 // struct X is parsed as class definition because of the trailing 2548 // brace. 2549 return ParseTypeName(&Range); 2550} 2551 2552/// \brief We have just started parsing the definition of a new class, 2553/// so push that class onto our stack of classes that is currently 2554/// being parsed. 2555Sema::ParsingClassState 2556Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2557 assert((NonNestedClass || !ClassStack.empty()) && 2558 "Nested class without outer class"); 2559 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2560 return Actions.PushParsingClass(); 2561} 2562 2563/// \brief Deallocate the given parsed class and all of its nested 2564/// classes. 2565void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2566 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2567 delete Class->LateParsedDeclarations[I]; 2568 delete Class; 2569} 2570 2571/// \brief Pop the top class of the stack of classes that are 2572/// currently being parsed. 2573/// 2574/// This routine should be called when we have finished parsing the 2575/// definition of a class, but have not yet popped the Scope 2576/// associated with the class's definition. 2577/// 2578/// \returns true if the class we've popped is a top-level class, 2579/// false otherwise. 2580void Parser::PopParsingClass(Sema::ParsingClassState state) { 2581 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2582 2583 Actions.PopParsingClass(state); 2584 2585 ParsingClass *Victim = ClassStack.top(); 2586 ClassStack.pop(); 2587 if (Victim->TopLevelClass) { 2588 // Deallocate all of the nested classes of this class, 2589 // recursively: we don't need to keep any of this information. 2590 DeallocateParsedClasses(Victim); 2591 return; 2592 } 2593 assert(!ClassStack.empty() && "Missing top-level class?"); 2594 2595 if (Victim->LateParsedDeclarations.empty()) { 2596 // The victim is a nested class, but we will not need to perform 2597 // any processing after the definition of this class since it has 2598 // no members whose handling was delayed. Therefore, we can just 2599 // remove this nested class. 2600 DeallocateParsedClasses(Victim); 2601 return; 2602 } 2603 2604 // This nested class has some members that will need to be processed 2605 // after the top-level class is completely defined. Therefore, add 2606 // it to the list of nested classes within its parent. 2607 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2608 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2609 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2610} 2611 2612/// ParseCXX0XAttributeSpecifier - Parse a C++0x attribute-specifier. Currently 2613/// only parses standard attributes. 2614/// 2615/// [C++0x] attribute-specifier: 2616/// '[' '[' attribute-list ']' ']' 2617/// alignment-specifier 2618/// 2619/// [C++0x] attribute-list: 2620/// attribute[opt] 2621/// attribute-list ',' attribute[opt] 2622/// 2623/// [C++0x] attribute: 2624/// attribute-token attribute-argument-clause[opt] 2625/// 2626/// [C++0x] attribute-token: 2627/// identifier 2628/// attribute-scoped-token 2629/// 2630/// [C++0x] attribute-scoped-token: 2631/// attribute-namespace '::' identifier 2632/// 2633/// [C++0x] attribute-namespace: 2634/// identifier 2635/// 2636/// [C++0x] attribute-argument-clause: 2637/// '(' balanced-token-seq ')' 2638/// 2639/// [C++0x] balanced-token-seq: 2640/// balanced-token 2641/// balanced-token-seq balanced-token 2642/// 2643/// [C++0x] balanced-token: 2644/// '(' balanced-token-seq ')' 2645/// '[' balanced-token-seq ']' 2646/// '{' balanced-token-seq '}' 2647/// any token but '(', ')', '[', ']', '{', or '}' 2648void Parser::ParseCXX0XAttributeSpecifier(ParsedAttributes &attrs, 2649 SourceLocation *endLoc) { 2650 if (Tok.is(tok::kw_alignas)) { 2651 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas); 2652 ParseAlignmentSpecifier(attrs, endLoc); 2653 return; 2654 } 2655 2656 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2657 && "Not a C++0x attribute list"); 2658 2659 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute); 2660 2661 ConsumeBracket(); 2662 ConsumeBracket(); 2663 2664 if (Tok.is(tok::comma)) { 2665 Diag(Tok.getLocation(), diag::err_expected_ident); 2666 ConsumeToken(); 2667 } 2668 2669 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2670 // attribute not present 2671 if (Tok.is(tok::comma)) { 2672 ConsumeToken(); 2673 continue; 2674 } 2675 2676 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2677 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2678 2679 // scoped attribute 2680 if (Tok.is(tok::coloncolon)) { 2681 ConsumeToken(); 2682 2683 if (!Tok.is(tok::identifier)) { 2684 Diag(Tok.getLocation(), diag::err_expected_ident); 2685 SkipUntil(tok::r_square, tok::comma, true, true); 2686 continue; 2687 } 2688 2689 ScopeName = AttrName; 2690 ScopeLoc = AttrLoc; 2691 2692 AttrName = Tok.getIdentifierInfo(); 2693 AttrLoc = ConsumeToken(); 2694 } 2695 2696 bool AttrParsed = false; 2697 // No scoped names are supported; ideally we could put all non-standard 2698 // attributes into namespaces. 2699 if (!ScopeName) { 2700 switch(AttributeList::getKind(AttrName)) 2701 { 2702 // No arguments 2703 case AttributeList::AT_carries_dependency: 2704 case AttributeList::AT_noreturn: { 2705 if (Tok.is(tok::l_paren)) { 2706 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2707 << AttrName->getName(); 2708 break; 2709 } 2710 2711 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2712 SourceLocation(), 0, 0, false, true); 2713 AttrParsed = true; 2714 break; 2715 } 2716 2717 // Silence warnings 2718 default: break; 2719 } 2720 } 2721 2722 // Skip the entire parameter clause, if any 2723 if (!AttrParsed && Tok.is(tok::l_paren)) { 2724 ConsumeParen(); 2725 // SkipUntil maintains the balancedness of tokens. 2726 SkipUntil(tok::r_paren, false); 2727 } 2728 } 2729 2730 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2731 SkipUntil(tok::r_square, false); 2732 if (endLoc) 2733 *endLoc = Tok.getLocation(); 2734 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2735 SkipUntil(tok::r_square, false); 2736} 2737 2738/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier-seq. 2739/// 2740/// attribute-specifier-seq: 2741/// attribute-specifier-seq[opt] attribute-specifier 2742void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2743 SourceLocation *endLoc) { 2744 SourceLocation StartLoc = Tok.getLocation(), Loc; 2745 if (!endLoc) 2746 endLoc = &Loc; 2747 2748 do { 2749 ParseCXX0XAttributeSpecifier(attrs, endLoc); 2750 } while (isCXX0XAttributeSpecifier()); 2751 2752 attrs.Range = SourceRange(StartLoc, *endLoc); 2753} 2754 2755/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2756/// 2757/// [MS] ms-attribute: 2758/// '[' token-seq ']' 2759/// 2760/// [MS] ms-attribute-seq: 2761/// ms-attribute[opt] 2762/// ms-attribute ms-attribute-seq 2763void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2764 SourceLocation *endLoc) { 2765 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2766 2767 while (Tok.is(tok::l_square)) { 2768 ConsumeBracket(); 2769 SkipUntil(tok::r_square, true, true); 2770 if (endLoc) *endLoc = Tok.getLocation(); 2771 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2772 } 2773} 2774 2775void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2776 AccessSpecifier& CurAS) { 2777 IfExistsCondition Result; 2778 if (ParseMicrosoftIfExistsCondition(Result)) 2779 return; 2780 2781 BalancedDelimiterTracker Braces(*this, tok::l_brace); 2782 if (Braces.consumeOpen()) { 2783 Diag(Tok, diag::err_expected_lbrace); 2784 return; 2785 } 2786 2787 switch (Result.Behavior) { 2788 case IEB_Parse: 2789 // Parse the declarations below. 2790 break; 2791 2792 case IEB_Dependent: 2793 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists) 2794 << Result.IsIfExists; 2795 // Fall through to skip. 2796 2797 case IEB_Skip: 2798 Braces.skipToEnd(); 2799 return; 2800 } 2801 2802 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2803 // __if_exists, __if_not_exists can nest. 2804 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2805 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2806 continue; 2807 } 2808 2809 // Check for extraneous top-level semicolon. 2810 if (Tok.is(tok::semi)) { 2811 Diag(Tok, diag::ext_extra_struct_semi) 2812 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2813 << FixItHint::CreateRemoval(Tok.getLocation()); 2814 ConsumeToken(); 2815 continue; 2816 } 2817 2818 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2819 if (AS != AS_none) { 2820 // Current token is a C++ access specifier. 2821 CurAS = AS; 2822 SourceLocation ASLoc = Tok.getLocation(); 2823 ConsumeToken(); 2824 if (Tok.is(tok::colon)) 2825 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2826 else 2827 Diag(Tok, diag::err_expected_colon); 2828 ConsumeToken(); 2829 continue; 2830 } 2831 2832 // Parse all the comma separated declarators. 2833 ParseCXXClassMemberDeclaration(CurAS, 0); 2834 } 2835 2836 Braces.consumeClose(); 2837} 2838