ParseDeclCXX.cpp revision 7d100872341f233c81e1d7b72b40457e62c36862
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 if (Tok.isNot(tok::l_brace)) { 99 if (!ExtraIdent.empty()) { 100 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 101 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 102 } 103 Diag(Tok, Ident ? diag::err_expected_lbrace : 104 diag::err_expected_ident_lbrace); 105 return 0; 106 } 107 108 SourceLocation LBrace = ConsumeBrace(); 109 110 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 111 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 112 getCurScope()->getFnParent()) { 113 if (!ExtraIdent.empty()) { 114 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 115 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 116 } 117 Diag(LBrace, diag::err_namespace_nonnamespace_scope); 118 SkipUntil(tok::r_brace, false); 119 return 0; 120 } 121 122 if (!ExtraIdent.empty()) { 123 TentativeParsingAction TPA(*this); 124 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 125 Token rBraceToken = Tok; 126 TPA.Revert(); 127 128 if (!rBraceToken.is(tok::r_brace)) { 129 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 130 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 131 } else { 132 std::string NamespaceFix; 133 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 134 E = ExtraIdent.end(); I != E; ++I) { 135 NamespaceFix += " { namespace "; 136 NamespaceFix += (*I)->getName(); 137 } 138 139 std::string RBraces; 140 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 141 RBraces += "} "; 142 143 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 144 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 145 ExtraIdentLoc.back()), 146 NamespaceFix) 147 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 148 } 149 } 150 151 // If we're still good, complain about inline namespaces in non-C++0x now. 152 if (!getLang().CPlusPlus0x && InlineLoc.isValid()) 153 Diag(InlineLoc, 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, LBrace, attrs.getList()); 161 162 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 163 "parsing namespace"); 164 165 SourceLocation RBraceLoc; 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, LBrace, attrs, RBraceLoc); 170 171 // Leave the namespace scope. 172 NamespaceScope.Exit(); 173 174 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 175 176 DeclEnd = RBraceLoc; 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 SourceLocation& LBrace, 186 ParsedAttributes& attrs, 187 SourceLocation& RBraceLoc) { 188 if (index == Ident.size()) { 189 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 190 ParsedAttributesWithRange attrs(AttrFactory); 191 MaybeParseCXX0XAttributes(attrs); 192 MaybeParseMicrosoftAttributes(attrs); 193 ParseExternalDeclaration(attrs); 194 } 195 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 196 197 return; 198 } 199 200 // Parse improperly nested namespaces. 201 ParseScope NamespaceScope(this, Scope::DeclScope); 202 Decl *NamespcDecl = 203 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 204 NamespaceLoc[index], IdentLoc[index], 205 Ident[index], LBrace, attrs.getList()); 206 207 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 208 LBrace, attrs, RBraceLoc); 209 210 NamespaceScope.Exit(); 211 212 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 213} 214 215/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 216/// alias definition. 217/// 218Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 219 SourceLocation AliasLoc, 220 IdentifierInfo *Alias, 221 SourceLocation &DeclEnd) { 222 assert(Tok.is(tok::equal) && "Not equal token"); 223 224 ConsumeToken(); // eat the '='. 225 226 if (Tok.is(tok::code_completion)) { 227 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 228 cutOffParsing(); 229 return 0; 230 } 231 232 CXXScopeSpec SS; 233 // Parse (optional) nested-name-specifier. 234 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 235 236 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 237 Diag(Tok, diag::err_expected_namespace_name); 238 // Skip to end of the definition and eat the ';'. 239 SkipUntil(tok::semi); 240 return 0; 241 } 242 243 // Parse identifier. 244 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 245 SourceLocation IdentLoc = ConsumeToken(); 246 247 // Eat the ';'. 248 DeclEnd = Tok.getLocation(); 249 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 250 "", tok::semi); 251 252 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 253 SS, IdentLoc, Ident); 254} 255 256/// ParseLinkage - We know that the current token is a string_literal 257/// and just before that, that extern was seen. 258/// 259/// linkage-specification: [C++ 7.5p2: dcl.link] 260/// 'extern' string-literal '{' declaration-seq[opt] '}' 261/// 'extern' string-literal declaration 262/// 263Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 264 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 265 llvm::SmallString<8> LangBuffer; 266 bool Invalid = false; 267 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 268 if (Invalid) 269 return 0; 270 271 SourceLocation Loc = ConsumeStringToken(); 272 273 ParseScope LinkageScope(this, Scope::DeclScope); 274 Decl *LinkageSpec 275 = Actions.ActOnStartLinkageSpecification(getCurScope(), 276 DS.getSourceRange().getBegin(), 277 Loc, Lang, 278 Tok.is(tok::l_brace) ? Tok.getLocation() 279 : SourceLocation()); 280 281 ParsedAttributesWithRange attrs(AttrFactory); 282 MaybeParseCXX0XAttributes(attrs); 283 MaybeParseMicrosoftAttributes(attrs); 284 285 if (Tok.isNot(tok::l_brace)) { 286 // Reset the source range in DS, as the leading "extern" 287 // does not really belong to the inner declaration ... 288 DS.SetRangeStart(SourceLocation()); 289 DS.SetRangeEnd(SourceLocation()); 290 // ... but anyway remember that such an "extern" was seen. 291 DS.setExternInLinkageSpec(true); 292 ParseExternalDeclaration(attrs, &DS); 293 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 294 SourceLocation()); 295 } 296 297 DS.abort(); 298 299 ProhibitAttributes(attrs); 300 301 SourceLocation LBrace = ConsumeBrace(); 302 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 303 ParsedAttributesWithRange attrs(AttrFactory); 304 MaybeParseCXX0XAttributes(attrs); 305 MaybeParseMicrosoftAttributes(attrs); 306 ParseExternalDeclaration(attrs); 307 } 308 309 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 310 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 311 RBrace); 312} 313 314/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 315/// using-directive. Assumes that current token is 'using'. 316Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 317 const ParsedTemplateInfo &TemplateInfo, 318 SourceLocation &DeclEnd, 319 ParsedAttributesWithRange &attrs, 320 Decl **OwnedType) { 321 assert(Tok.is(tok::kw_using) && "Not using token"); 322 ObjCDeclContextSwitch ObjCDC(*this); 323 324 // Eat 'using'. 325 SourceLocation UsingLoc = ConsumeToken(); 326 327 if (Tok.is(tok::code_completion)) { 328 Actions.CodeCompleteUsing(getCurScope()); 329 cutOffParsing(); 330 return 0; 331 } 332 333 // 'using namespace' means this is a using-directive. 334 if (Tok.is(tok::kw_namespace)) { 335 // Template parameters are always an error here. 336 if (TemplateInfo.Kind) { 337 SourceRange R = TemplateInfo.getSourceRange(); 338 Diag(UsingLoc, diag::err_templated_using_directive) 339 << R << FixItHint::CreateRemoval(R); 340 } 341 342 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 343 } 344 345 // Otherwise, it must be a using-declaration or an alias-declaration. 346 347 // Using declarations can't have attributes. 348 ProhibitAttributes(attrs); 349 350 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 351 AS_none, OwnedType); 352} 353 354/// ParseUsingDirective - Parse C++ using-directive, assumes 355/// that current token is 'namespace' and 'using' was already parsed. 356/// 357/// using-directive: [C++ 7.3.p4: namespace.udir] 358/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 359/// namespace-name ; 360/// [GNU] using-directive: 361/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 362/// namespace-name attributes[opt] ; 363/// 364Decl *Parser::ParseUsingDirective(unsigned Context, 365 SourceLocation UsingLoc, 366 SourceLocation &DeclEnd, 367 ParsedAttributes &attrs) { 368 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 369 370 // Eat 'namespace'. 371 SourceLocation NamespcLoc = ConsumeToken(); 372 373 if (Tok.is(tok::code_completion)) { 374 Actions.CodeCompleteUsingDirective(getCurScope()); 375 cutOffParsing(); 376 return 0; 377 } 378 379 CXXScopeSpec SS; 380 // Parse (optional) nested-name-specifier. 381 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 382 383 IdentifierInfo *NamespcName = 0; 384 SourceLocation IdentLoc = SourceLocation(); 385 386 // Parse namespace-name. 387 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 388 Diag(Tok, diag::err_expected_namespace_name); 389 // If there was invalid namespace name, skip to end of decl, and eat ';'. 390 SkipUntil(tok::semi); 391 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 392 return 0; 393 } 394 395 // Parse identifier. 396 NamespcName = Tok.getIdentifierInfo(); 397 IdentLoc = ConsumeToken(); 398 399 // Parse (optional) attributes (most likely GNU strong-using extension). 400 bool GNUAttr = false; 401 if (Tok.is(tok::kw___attribute)) { 402 GNUAttr = true; 403 ParseGNUAttributes(attrs); 404 } 405 406 // Eat ';'. 407 DeclEnd = Tok.getLocation(); 408 ExpectAndConsume(tok::semi, 409 GNUAttr ? diag::err_expected_semi_after_attribute_list 410 : diag::err_expected_semi_after_namespace_name, 411 "", tok::semi); 412 413 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 414 IdentLoc, NamespcName, attrs.getList()); 415} 416 417/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 418/// Assumes that 'using' was already seen. 419/// 420/// using-declaration: [C++ 7.3.p3: namespace.udecl] 421/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 422/// unqualified-id 423/// 'using' :: unqualified-id 424/// 425/// alias-declaration: C++0x [decl.typedef]p2 426/// 'using' identifier = type-id ; 427/// 428Decl *Parser::ParseUsingDeclaration(unsigned Context, 429 const ParsedTemplateInfo &TemplateInfo, 430 SourceLocation UsingLoc, 431 SourceLocation &DeclEnd, 432 AccessSpecifier AS, 433 Decl **OwnedType) { 434 CXXScopeSpec SS; 435 SourceLocation TypenameLoc; 436 bool IsTypeName; 437 438 // Ignore optional 'typename'. 439 // FIXME: This is wrong; we should parse this as a typename-specifier. 440 if (Tok.is(tok::kw_typename)) { 441 TypenameLoc = Tok.getLocation(); 442 ConsumeToken(); 443 IsTypeName = true; 444 } 445 else 446 IsTypeName = false; 447 448 // Parse nested-name-specifier. 449 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 450 451 // Check nested-name specifier. 452 if (SS.isInvalid()) { 453 SkipUntil(tok::semi); 454 return 0; 455 } 456 457 // Parse the unqualified-id. We allow parsing of both constructor and 458 // destructor names and allow the action module to diagnose any semantic 459 // errors. 460 UnqualifiedId Name; 461 if (ParseUnqualifiedId(SS, 462 /*EnteringContext=*/false, 463 /*AllowDestructorName=*/true, 464 /*AllowConstructorName=*/true, 465 ParsedType(), 466 Name)) { 467 SkipUntil(tok::semi); 468 return 0; 469 } 470 471 ParsedAttributes attrs(AttrFactory); 472 473 // Maybe this is an alias-declaration. 474 bool IsAliasDecl = Tok.is(tok::equal); 475 TypeResult TypeAlias; 476 if (IsAliasDecl) { 477 // TODO: Attribute support. C++0x attributes may appear before the equals. 478 // Where can GNU attributes appear? 479 ConsumeToken(); 480 481 if (!getLang().CPlusPlus0x) 482 Diag(Tok.getLocation(), diag::ext_alias_declaration); 483 484 // Type alias templates cannot be specialized. 485 int SpecKind = -1; 486 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 487 Name.getKind() == UnqualifiedId::IK_TemplateId) 488 SpecKind = 0; 489 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 490 SpecKind = 1; 491 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 492 SpecKind = 2; 493 if (SpecKind != -1) { 494 SourceRange Range; 495 if (SpecKind == 0) 496 Range = SourceRange(Name.TemplateId->LAngleLoc, 497 Name.TemplateId->RAngleLoc); 498 else 499 Range = TemplateInfo.getSourceRange(); 500 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 501 << SpecKind << Range; 502 SkipUntil(tok::semi); 503 return 0; 504 } 505 506 // Name must be an identifier. 507 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 508 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 509 // No removal fixit: can't recover from this. 510 SkipUntil(tok::semi); 511 return 0; 512 } else if (IsTypeName) 513 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 514 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 515 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 516 else if (SS.isNotEmpty()) 517 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 518 << FixItHint::CreateRemoval(SS.getRange()); 519 520 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 521 Declarator::AliasTemplateContext : 522 Declarator::AliasDeclContext, 0, AS, OwnedType); 523 } else 524 // Parse (optional) attributes (most likely GNU strong-using extension). 525 MaybeParseGNUAttributes(attrs); 526 527 // Eat ';'. 528 DeclEnd = Tok.getLocation(); 529 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 530 !attrs.empty() ? "attributes list" : 531 IsAliasDecl ? "alias declaration" : "using declaration", 532 tok::semi); 533 534 // Diagnose an attempt to declare a templated using-declaration. 535 // In C++0x, alias-declarations can be templates: 536 // template <...> using id = type; 537 if (TemplateInfo.Kind && !IsAliasDecl) { 538 SourceRange R = TemplateInfo.getSourceRange(); 539 Diag(UsingLoc, diag::err_templated_using_declaration) 540 << R << FixItHint::CreateRemoval(R); 541 542 // Unfortunately, we have to bail out instead of recovering by 543 // ignoring the parameters, just in case the nested name specifier 544 // depends on the parameters. 545 return 0; 546 } 547 548 if (IsAliasDecl) { 549 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 550 MultiTemplateParamsArg TemplateParamsArg(Actions, 551 TemplateParams ? TemplateParams->data() : 0, 552 TemplateParams ? TemplateParams->size() : 0); 553 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 554 UsingLoc, Name, TypeAlias); 555 } 556 557 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 558 Name, attrs.getList(), 559 IsTypeName, TypenameLoc); 560} 561 562/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 563/// 564/// [C++0x] static_assert-declaration: 565/// static_assert ( constant-expression , string-literal ) ; 566/// 567/// [C1X] static_assert-declaration: 568/// _Static_assert ( constant-expression , string-literal ) ; 569/// 570Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 571 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 572 "Not a static_assert declaration"); 573 574 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 575 Diag(Tok, diag::ext_c1x_static_assert); 576 577 SourceLocation StaticAssertLoc = ConsumeToken(); 578 579 if (Tok.isNot(tok::l_paren)) { 580 Diag(Tok, diag::err_expected_lparen); 581 return 0; 582 } 583 584 SourceLocation LParenLoc = ConsumeParen(); 585 586 ExprResult AssertExpr(ParseConstantExpression()); 587 if (AssertExpr.isInvalid()) { 588 SkipUntil(tok::semi); 589 return 0; 590 } 591 592 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 593 return 0; 594 595 if (Tok.isNot(tok::string_literal)) { 596 Diag(Tok, diag::err_expected_string_literal); 597 SkipUntil(tok::semi); 598 return 0; 599 } 600 601 ExprResult AssertMessage(ParseStringLiteralExpression()); 602 if (AssertMessage.isInvalid()) 603 return 0; 604 605 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 606 607 DeclEnd = Tok.getLocation(); 608 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 609 610 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 611 AssertExpr.take(), 612 AssertMessage.take(), 613 RParenLoc); 614} 615 616/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 617/// 618/// 'decltype' ( expression ) 619/// 620void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 621 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 622 623 SourceLocation StartLoc = ConsumeToken(); 624 SourceLocation LParenLoc = Tok.getLocation(); 625 626 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 627 "decltype")) { 628 SkipUntil(tok::r_paren); 629 return; 630 } 631 632 // Parse the expression 633 634 // C++0x [dcl.type.simple]p4: 635 // The operand of the decltype specifier is an unevaluated operand. 636 EnterExpressionEvaluationContext Unevaluated(Actions, 637 Sema::Unevaluated); 638 ExprResult Result = ParseExpression(); 639 if (Result.isInvalid()) { 640 SkipUntil(tok::r_paren); 641 return; 642 } 643 644 // Match the ')' 645 SourceLocation RParenLoc; 646 if (Tok.is(tok::r_paren)) 647 RParenLoc = ConsumeParen(); 648 else 649 MatchRHSPunctuation(tok::r_paren, LParenLoc); 650 651 if (RParenLoc.isInvalid()) 652 return; 653 654 const char *PrevSpec = 0; 655 unsigned DiagID; 656 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 657 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 658 DiagID, Result.release())) 659 Diag(StartLoc, DiagID) << PrevSpec; 660} 661 662void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 663 assert(Tok.is(tok::kw___underlying_type) && 664 "Not an underlying type specifier"); 665 666 SourceLocation StartLoc = ConsumeToken(); 667 SourceLocation LParenLoc = Tok.getLocation(); 668 669 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 670 "__underlying_type")) { 671 SkipUntil(tok::r_paren); 672 return; 673 } 674 675 TypeResult Result = ParseTypeName(); 676 if (Result.isInvalid()) { 677 SkipUntil(tok::r_paren); 678 return; 679 } 680 681 // Match the ')' 682 SourceLocation RParenLoc; 683 if (Tok.is(tok::r_paren)) 684 RParenLoc = ConsumeParen(); 685 else 686 MatchRHSPunctuation(tok::r_paren, LParenLoc); 687 688 if (RParenLoc.isInvalid()) 689 return; 690 691 const char *PrevSpec = 0; 692 unsigned DiagID; 693 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 694 DiagID, Result.release())) 695 Diag(StartLoc, DiagID) << PrevSpec; 696} 697 698/// ParseClassName - Parse a C++ class-name, which names a class. Note 699/// that we only check that the result names a type; semantic analysis 700/// will need to verify that the type names a class. The result is 701/// either a type or NULL, depending on whether a type name was 702/// found. 703/// 704/// class-name: [C++ 9.1] 705/// identifier 706/// simple-template-id 707/// 708Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 709 CXXScopeSpec &SS) { 710 // Check whether we have a template-id that names a type. 711 if (Tok.is(tok::annot_template_id)) { 712 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 713 if (TemplateId->Kind == TNK_Type_template || 714 TemplateId->Kind == TNK_Dependent_template_name) { 715 AnnotateTemplateIdTokenAsType(); 716 717 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 718 ParsedType Type = getTypeAnnotation(Tok); 719 EndLocation = Tok.getAnnotationEndLoc(); 720 ConsumeToken(); 721 722 if (Type) 723 return Type; 724 return true; 725 } 726 727 // Fall through to produce an error below. 728 } 729 730 if (Tok.isNot(tok::identifier)) { 731 Diag(Tok, diag::err_expected_class_name); 732 return true; 733 } 734 735 IdentifierInfo *Id = Tok.getIdentifierInfo(); 736 SourceLocation IdLoc = ConsumeToken(); 737 738 if (Tok.is(tok::less)) { 739 // It looks the user intended to write a template-id here, but the 740 // template-name was wrong. Try to fix that. 741 TemplateNameKind TNK = TNK_Type_template; 742 TemplateTy Template; 743 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 744 &SS, Template, TNK)) { 745 Diag(IdLoc, diag::err_unknown_template_name) 746 << Id; 747 } 748 749 if (!Template) 750 return true; 751 752 // Form the template name 753 UnqualifiedId TemplateName; 754 TemplateName.setIdentifier(Id, IdLoc); 755 756 // Parse the full template-id, then turn it into a type. 757 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 758 SourceLocation(), true)) 759 return true; 760 if (TNK == TNK_Dependent_template_name) 761 AnnotateTemplateIdTokenAsType(); 762 763 // If we didn't end up with a typename token, there's nothing more we 764 // can do. 765 if (Tok.isNot(tok::annot_typename)) 766 return true; 767 768 // Retrieve the type from the annotation token, consume that token, and 769 // return. 770 EndLocation = Tok.getAnnotationEndLoc(); 771 ParsedType Type = getTypeAnnotation(Tok); 772 ConsumeToken(); 773 return Type; 774 } 775 776 // We have an identifier; check whether it is actually a type. 777 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 778 false, ParsedType(), 779 /*NonTrivialTypeSourceInfo=*/true); 780 if (!Type) { 781 Diag(IdLoc, diag::err_expected_class_name); 782 return true; 783 } 784 785 // Consume the identifier. 786 EndLocation = IdLoc; 787 788 // Fake up a Declarator to use with ActOnTypeName. 789 DeclSpec DS(AttrFactory); 790 DS.SetRangeStart(IdLoc); 791 DS.SetRangeEnd(EndLocation); 792 DS.getTypeSpecScope() = SS; 793 794 const char *PrevSpec = 0; 795 unsigned DiagID; 796 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 797 798 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 799 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 800} 801 802/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 803/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 804/// until we reach the start of a definition or see a token that 805/// cannot start a definition. If SuppressDeclarations is true, we do know. 806/// 807/// class-specifier: [C++ class] 808/// class-head '{' member-specification[opt] '}' 809/// class-head '{' member-specification[opt] '}' attributes[opt] 810/// class-head: 811/// class-key identifier[opt] base-clause[opt] 812/// class-key nested-name-specifier identifier base-clause[opt] 813/// class-key nested-name-specifier[opt] simple-template-id 814/// base-clause[opt] 815/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 816/// [GNU] class-key attributes[opt] nested-name-specifier 817/// identifier base-clause[opt] 818/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 819/// simple-template-id base-clause[opt] 820/// class-key: 821/// 'class' 822/// 'struct' 823/// 'union' 824/// 825/// elaborated-type-specifier: [C++ dcl.type.elab] 826/// class-key ::[opt] nested-name-specifier[opt] identifier 827/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 828/// simple-template-id 829/// 830/// Note that the C++ class-specifier and elaborated-type-specifier, 831/// together, subsume the C99 struct-or-union-specifier: 832/// 833/// struct-or-union-specifier: [C99 6.7.2.1] 834/// struct-or-union identifier[opt] '{' struct-contents '}' 835/// struct-or-union identifier 836/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 837/// '}' attributes[opt] 838/// [GNU] struct-or-union attributes[opt] identifier 839/// struct-or-union: 840/// 'struct' 841/// 'union' 842void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 843 SourceLocation StartLoc, DeclSpec &DS, 844 const ParsedTemplateInfo &TemplateInfo, 845 AccessSpecifier AS, bool SuppressDeclarations){ 846 DeclSpec::TST TagType; 847 if (TagTokKind == tok::kw_struct) 848 TagType = DeclSpec::TST_struct; 849 else if (TagTokKind == tok::kw_class) 850 TagType = DeclSpec::TST_class; 851 else { 852 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 853 TagType = DeclSpec::TST_union; 854 } 855 856 if (Tok.is(tok::code_completion)) { 857 // Code completion for a struct, class, or union name. 858 Actions.CodeCompleteTag(getCurScope(), TagType); 859 return cutOffParsing(); 860 } 861 862 // C++03 [temp.explicit] 14.7.2/8: 863 // The usual access checking rules do not apply to names used to specify 864 // explicit instantiations. 865 // 866 // As an extension we do not perform access checking on the names used to 867 // specify explicit specializations either. This is important to allow 868 // specializing traits classes for private types. 869 bool SuppressingAccessChecks = false; 870 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 871 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 872 Actions.ActOnStartSuppressingAccessChecks(); 873 SuppressingAccessChecks = true; 874 } 875 876 ParsedAttributes attrs(AttrFactory); 877 // If attributes exist after tag, parse them. 878 if (Tok.is(tok::kw___attribute)) 879 ParseGNUAttributes(attrs); 880 881 // If declspecs exist after tag, parse them. 882 while (Tok.is(tok::kw___declspec)) 883 ParseMicrosoftDeclSpec(attrs); 884 885 // If C++0x attributes exist here, parse them. 886 // FIXME: Are we consistent with the ordering of parsing of different 887 // styles of attributes? 888 MaybeParseCXX0XAttributes(attrs); 889 890 if (TagType == DeclSpec::TST_struct && 891 !Tok.is(tok::identifier) && 892 Tok.getIdentifierInfo() && 893 (Tok.is(tok::kw___is_arithmetic) || 894 Tok.is(tok::kw___is_convertible) || 895 Tok.is(tok::kw___is_empty) || 896 Tok.is(tok::kw___is_floating_point) || 897 Tok.is(tok::kw___is_function) || 898 Tok.is(tok::kw___is_fundamental) || 899 Tok.is(tok::kw___is_integral) || 900 Tok.is(tok::kw___is_member_function_pointer) || 901 Tok.is(tok::kw___is_member_pointer) || 902 Tok.is(tok::kw___is_pod) || 903 Tok.is(tok::kw___is_pointer) || 904 Tok.is(tok::kw___is_same) || 905 Tok.is(tok::kw___is_scalar) || 906 Tok.is(tok::kw___is_signed) || 907 Tok.is(tok::kw___is_unsigned) || 908 Tok.is(tok::kw___is_void))) { 909 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 910 // name of struct templates, but some are keywords in GCC >= 4.3 911 // and Clang. Therefore, when we see the token sequence "struct 912 // X", make X into a normal identifier rather than a keyword, to 913 // allow libstdc++ 4.2 and libc++ to work properly. 914 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 915 Tok.setKind(tok::identifier); 916 } 917 918 // Parse the (optional) nested-name-specifier. 919 CXXScopeSpec &SS = DS.getTypeSpecScope(); 920 if (getLang().CPlusPlus) { 921 // "FOO : BAR" is not a potential typo for "FOO::BAR". 922 ColonProtectionRAIIObject X(*this); 923 924 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 925 DS.SetTypeSpecError(); 926 if (SS.isSet()) 927 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 928 Diag(Tok, diag::err_expected_ident); 929 } 930 931 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 932 933 // Parse the (optional) class name or simple-template-id. 934 IdentifierInfo *Name = 0; 935 SourceLocation NameLoc; 936 TemplateIdAnnotation *TemplateId = 0; 937 if (Tok.is(tok::identifier)) { 938 Name = Tok.getIdentifierInfo(); 939 NameLoc = ConsumeToken(); 940 941 if (Tok.is(tok::less) && getLang().CPlusPlus) { 942 // The name was supposed to refer to a template, but didn't. 943 // Eat the template argument list and try to continue parsing this as 944 // a class (or template thereof). 945 TemplateArgList TemplateArgs; 946 SourceLocation LAngleLoc, RAngleLoc; 947 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 948 true, LAngleLoc, 949 TemplateArgs, RAngleLoc)) { 950 // We couldn't parse the template argument list at all, so don't 951 // try to give any location information for the list. 952 LAngleLoc = RAngleLoc = SourceLocation(); 953 } 954 955 Diag(NameLoc, diag::err_explicit_spec_non_template) 956 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 957 << (TagType == DeclSpec::TST_class? 0 958 : TagType == DeclSpec::TST_struct? 1 959 : 2) 960 << Name 961 << SourceRange(LAngleLoc, RAngleLoc); 962 963 // Strip off the last template parameter list if it was empty, since 964 // we've removed its template argument list. 965 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 966 if (TemplateParams && TemplateParams->size() > 1) { 967 TemplateParams->pop_back(); 968 } else { 969 TemplateParams = 0; 970 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 971 = ParsedTemplateInfo::NonTemplate; 972 } 973 } else if (TemplateInfo.Kind 974 == ParsedTemplateInfo::ExplicitInstantiation) { 975 // Pretend this is just a forward declaration. 976 TemplateParams = 0; 977 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 978 = ParsedTemplateInfo::NonTemplate; 979 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 980 = SourceLocation(); 981 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 982 = SourceLocation(); 983 } 984 } 985 } else if (Tok.is(tok::annot_template_id)) { 986 TemplateId = takeTemplateIdAnnotation(Tok); 987 NameLoc = ConsumeToken(); 988 989 if (TemplateId->Kind != TNK_Type_template && 990 TemplateId->Kind != TNK_Dependent_template_name) { 991 // The template-name in the simple-template-id refers to 992 // something other than a class template. Give an appropriate 993 // error message and skip to the ';'. 994 SourceRange Range(NameLoc); 995 if (SS.isNotEmpty()) 996 Range.setBegin(SS.getBeginLoc()); 997 998 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 999 << Name << static_cast<int>(TemplateId->Kind) << Range; 1000 1001 DS.SetTypeSpecError(); 1002 SkipUntil(tok::semi, false, true); 1003 if (SuppressingAccessChecks) 1004 Actions.ActOnStopSuppressingAccessChecks(); 1005 1006 return; 1007 } 1008 } 1009 1010 // As soon as we're finished parsing the class's template-id, turn access 1011 // checking back on. 1012 if (SuppressingAccessChecks) 1013 Actions.ActOnStopSuppressingAccessChecks(); 1014 1015 // There are four options here. If we have 'struct foo;', then this 1016 // is either a forward declaration or a friend declaration, which 1017 // have to be treated differently. If we have 'struct foo {...', 1018 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1019 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1020 // However, in some contexts, things look like declarations but are just 1021 // references, e.g. 1022 // new struct s; 1023 // or 1024 // &T::operator struct s; 1025 // For these, SuppressDeclarations is true. 1026 Sema::TagUseKind TUK; 1027 if (SuppressDeclarations) 1028 TUK = Sema::TUK_Reference; 1029 else if (Tok.is(tok::l_brace) || 1030 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1031 isCXX0XFinalKeyword()) { 1032 if (DS.isFriendSpecified()) { 1033 // C++ [class.friend]p2: 1034 // A class shall not be defined in a friend declaration. 1035 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1036 << SourceRange(DS.getFriendSpecLoc()); 1037 1038 // Skip everything up to the semicolon, so that this looks like a proper 1039 // friend class (or template thereof) declaration. 1040 SkipUntil(tok::semi, true, true); 1041 TUK = Sema::TUK_Friend; 1042 } else { 1043 // Okay, this is a class definition. 1044 TUK = Sema::TUK_Definition; 1045 } 1046 } else if (Tok.is(tok::semi)) 1047 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1048 else 1049 TUK = Sema::TUK_Reference; 1050 1051 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1052 TUK != Sema::TUK_Definition)) { 1053 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1054 // We have a declaration or reference to an anonymous class. 1055 Diag(StartLoc, diag::err_anon_type_definition) 1056 << DeclSpec::getSpecifierName(TagType); 1057 } 1058 1059 SkipUntil(tok::comma, true); 1060 return; 1061 } 1062 1063 // Create the tag portion of the class or class template. 1064 DeclResult TagOrTempResult = true; // invalid 1065 TypeResult TypeResult = true; // invalid 1066 1067 bool Owned = false; 1068 if (TemplateId) { 1069 // Explicit specialization, class template partial specialization, 1070 // or explicit instantiation. 1071 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1072 TemplateId->getTemplateArgs(), 1073 TemplateId->NumArgs); 1074 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1075 TUK == Sema::TUK_Declaration) { 1076 // This is an explicit instantiation of a class template. 1077 TagOrTempResult 1078 = Actions.ActOnExplicitInstantiation(getCurScope(), 1079 TemplateInfo.ExternLoc, 1080 TemplateInfo.TemplateLoc, 1081 TagType, 1082 StartLoc, 1083 SS, 1084 TemplateId->Template, 1085 TemplateId->TemplateNameLoc, 1086 TemplateId->LAngleLoc, 1087 TemplateArgsPtr, 1088 TemplateId->RAngleLoc, 1089 attrs.getList()); 1090 1091 // Friend template-ids are treated as references unless 1092 // they have template headers, in which case they're ill-formed 1093 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1094 // We diagnose this error in ActOnClassTemplateSpecialization. 1095 } else if (TUK == Sema::TUK_Reference || 1096 (TUK == Sema::TUK_Friend && 1097 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1098 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1099 StartLoc, 1100 TemplateId->SS, 1101 TemplateId->Template, 1102 TemplateId->TemplateNameLoc, 1103 TemplateId->LAngleLoc, 1104 TemplateArgsPtr, 1105 TemplateId->RAngleLoc); 1106 } else { 1107 // This is an explicit specialization or a class template 1108 // partial specialization. 1109 TemplateParameterLists FakedParamLists; 1110 1111 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1112 // This looks like an explicit instantiation, because we have 1113 // something like 1114 // 1115 // template class Foo<X> 1116 // 1117 // but it actually has a definition. Most likely, this was 1118 // meant to be an explicit specialization, but the user forgot 1119 // the '<>' after 'template'. 1120 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1121 1122 SourceLocation LAngleLoc 1123 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1124 Diag(TemplateId->TemplateNameLoc, 1125 diag::err_explicit_instantiation_with_definition) 1126 << SourceRange(TemplateInfo.TemplateLoc) 1127 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1128 1129 // Create a fake template parameter list that contains only 1130 // "template<>", so that we treat this construct as a class 1131 // template specialization. 1132 FakedParamLists.push_back( 1133 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1134 TemplateInfo.TemplateLoc, 1135 LAngleLoc, 1136 0, 0, 1137 LAngleLoc)); 1138 TemplateParams = &FakedParamLists; 1139 } 1140 1141 // Build the class template specialization. 1142 TagOrTempResult 1143 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1144 StartLoc, SS, 1145 TemplateId->Template, 1146 TemplateId->TemplateNameLoc, 1147 TemplateId->LAngleLoc, 1148 TemplateArgsPtr, 1149 TemplateId->RAngleLoc, 1150 attrs.getList(), 1151 MultiTemplateParamsArg(Actions, 1152 TemplateParams? &(*TemplateParams)[0] : 0, 1153 TemplateParams? TemplateParams->size() : 0)); 1154 } 1155 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1156 TUK == Sema::TUK_Declaration) { 1157 // Explicit instantiation of a member of a class template 1158 // specialization, e.g., 1159 // 1160 // template struct Outer<int>::Inner; 1161 // 1162 TagOrTempResult 1163 = Actions.ActOnExplicitInstantiation(getCurScope(), 1164 TemplateInfo.ExternLoc, 1165 TemplateInfo.TemplateLoc, 1166 TagType, StartLoc, SS, Name, 1167 NameLoc, attrs.getList()); 1168 } else if (TUK == Sema::TUK_Friend && 1169 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1170 TagOrTempResult = 1171 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1172 TagType, StartLoc, SS, 1173 Name, NameLoc, attrs.getList(), 1174 MultiTemplateParamsArg(Actions, 1175 TemplateParams? &(*TemplateParams)[0] : 0, 1176 TemplateParams? TemplateParams->size() : 0)); 1177 } else { 1178 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1179 TUK == Sema::TUK_Definition) { 1180 // FIXME: Diagnose this particular error. 1181 } 1182 1183 bool IsDependent = false; 1184 1185 // Don't pass down template parameter lists if this is just a tag 1186 // reference. For example, we don't need the template parameters here: 1187 // template <class T> class A *makeA(T t); 1188 MultiTemplateParamsArg TParams; 1189 if (TUK != Sema::TUK_Reference && TemplateParams) 1190 TParams = 1191 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1192 1193 // Declaration or definition of a class type 1194 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1195 SS, Name, NameLoc, attrs.getList(), AS, 1196 TParams, Owned, IsDependent, false, 1197 false, clang::TypeResult()); 1198 1199 // If ActOnTag said the type was dependent, try again with the 1200 // less common call. 1201 if (IsDependent) { 1202 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1203 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1204 SS, Name, StartLoc, NameLoc); 1205 } 1206 } 1207 1208 // If there is a body, parse it and inform the actions module. 1209 if (TUK == Sema::TUK_Definition) { 1210 assert(Tok.is(tok::l_brace) || 1211 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1212 isCXX0XFinalKeyword()); 1213 if (getLang().CPlusPlus) 1214 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1215 else 1216 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1217 } 1218 1219 const char *PrevSpec = 0; 1220 unsigned DiagID; 1221 bool Result; 1222 if (!TypeResult.isInvalid()) { 1223 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1224 NameLoc.isValid() ? NameLoc : StartLoc, 1225 PrevSpec, DiagID, TypeResult.get()); 1226 } else if (!TagOrTempResult.isInvalid()) { 1227 Result = DS.SetTypeSpecType(TagType, StartLoc, 1228 NameLoc.isValid() ? NameLoc : StartLoc, 1229 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1230 } else { 1231 DS.SetTypeSpecError(); 1232 return; 1233 } 1234 1235 if (Result) 1236 Diag(StartLoc, DiagID) << PrevSpec; 1237 1238 // At this point, we've successfully parsed a class-specifier in 'definition' 1239 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1240 // going to look at what comes after it to improve error recovery. If an 1241 // impossible token occurs next, we assume that the programmer forgot a ; at 1242 // the end of the declaration and recover that way. 1243 // 1244 // This switch enumerates the valid "follow" set for definition. 1245 if (TUK == Sema::TUK_Definition) { 1246 bool ExpectedSemi = true; 1247 switch (Tok.getKind()) { 1248 default: break; 1249 case tok::semi: // struct foo {...} ; 1250 case tok::star: // struct foo {...} * P; 1251 case tok::amp: // struct foo {...} & R = ... 1252 case tok::identifier: // struct foo {...} V ; 1253 case tok::r_paren: //(struct foo {...} ) {4} 1254 case tok::annot_cxxscope: // struct foo {...} a:: b; 1255 case tok::annot_typename: // struct foo {...} a ::b; 1256 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1257 case tok::l_paren: // struct foo {...} ( x); 1258 case tok::comma: // __builtin_offsetof(struct foo{...} , 1259 ExpectedSemi = false; 1260 break; 1261 // Type qualifiers 1262 case tok::kw_const: // struct foo {...} const x; 1263 case tok::kw_volatile: // struct foo {...} volatile x; 1264 case tok::kw_restrict: // struct foo {...} restrict x; 1265 case tok::kw_inline: // struct foo {...} inline foo() {}; 1266 // Storage-class specifiers 1267 case tok::kw_static: // struct foo {...} static x; 1268 case tok::kw_extern: // struct foo {...} extern x; 1269 case tok::kw_typedef: // struct foo {...} typedef x; 1270 case tok::kw_register: // struct foo {...} register x; 1271 case tok::kw_auto: // struct foo {...} auto x; 1272 case tok::kw_mutable: // struct foo {...} mutable x; 1273 case tok::kw_constexpr: // struct foo {...} constexpr x; 1274 // As shown above, type qualifiers and storage class specifiers absolutely 1275 // can occur after class specifiers according to the grammar. However, 1276 // almost no one actually writes code like this. If we see one of these, 1277 // it is much more likely that someone missed a semi colon and the 1278 // type/storage class specifier we're seeing is part of the *next* 1279 // intended declaration, as in: 1280 // 1281 // struct foo { ... } 1282 // typedef int X; 1283 // 1284 // We'd really like to emit a missing semicolon error instead of emitting 1285 // an error on the 'int' saying that you can't have two type specifiers in 1286 // the same declaration of X. Because of this, we look ahead past this 1287 // token to see if it's a type specifier. If so, we know the code is 1288 // otherwise invalid, so we can produce the expected semi error. 1289 if (!isKnownToBeTypeSpecifier(NextToken())) 1290 ExpectedSemi = false; 1291 break; 1292 1293 case tok::r_brace: // struct bar { struct foo {...} } 1294 // Missing ';' at end of struct is accepted as an extension in C mode. 1295 if (!getLang().CPlusPlus) 1296 ExpectedSemi = false; 1297 break; 1298 } 1299 1300 // C++ [temp]p3 In a template-declaration which defines a class, no 1301 // declarator is permitted. 1302 if (TemplateInfo.Kind) 1303 ExpectedSemi = true; 1304 1305 if (ExpectedSemi) { 1306 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1307 TagType == DeclSpec::TST_class ? "class" 1308 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1309 // Push this token back into the preprocessor and change our current token 1310 // to ';' so that the rest of the code recovers as though there were an 1311 // ';' after the definition. 1312 PP.EnterToken(Tok); 1313 Tok.setKind(tok::semi); 1314 } 1315 } 1316} 1317 1318/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1319/// 1320/// base-clause : [C++ class.derived] 1321/// ':' base-specifier-list 1322/// base-specifier-list: 1323/// base-specifier '...'[opt] 1324/// base-specifier-list ',' base-specifier '...'[opt] 1325void Parser::ParseBaseClause(Decl *ClassDecl) { 1326 assert(Tok.is(tok::colon) && "Not a base clause"); 1327 ConsumeToken(); 1328 1329 // Build up an array of parsed base specifiers. 1330 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1331 1332 while (true) { 1333 // Parse a base-specifier. 1334 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1335 if (Result.isInvalid()) { 1336 // Skip the rest of this base specifier, up until the comma or 1337 // opening brace. 1338 SkipUntil(tok::comma, tok::l_brace, true, true); 1339 } else { 1340 // Add this to our array of base specifiers. 1341 BaseInfo.push_back(Result.get()); 1342 } 1343 1344 // If the next token is a comma, consume it and keep reading 1345 // base-specifiers. 1346 if (Tok.isNot(tok::comma)) break; 1347 1348 // Consume the comma. 1349 ConsumeToken(); 1350 } 1351 1352 // Attach the base specifiers 1353 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1354} 1355 1356/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1357/// one entry in the base class list of a class specifier, for example: 1358/// class foo : public bar, virtual private baz { 1359/// 'public bar' and 'virtual private baz' are each base-specifiers. 1360/// 1361/// base-specifier: [C++ class.derived] 1362/// ::[opt] nested-name-specifier[opt] class-name 1363/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1364/// class-name 1365/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1366/// class-name 1367Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1368 bool IsVirtual = false; 1369 SourceLocation StartLoc = Tok.getLocation(); 1370 1371 // Parse the 'virtual' keyword. 1372 if (Tok.is(tok::kw_virtual)) { 1373 ConsumeToken(); 1374 IsVirtual = true; 1375 } 1376 1377 // Parse an (optional) access specifier. 1378 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1379 if (Access != AS_none) 1380 ConsumeToken(); 1381 1382 // Parse the 'virtual' keyword (again!), in case it came after the 1383 // access specifier. 1384 if (Tok.is(tok::kw_virtual)) { 1385 SourceLocation VirtualLoc = ConsumeToken(); 1386 if (IsVirtual) { 1387 // Complain about duplicate 'virtual' 1388 Diag(VirtualLoc, diag::err_dup_virtual) 1389 << FixItHint::CreateRemoval(VirtualLoc); 1390 } 1391 1392 IsVirtual = true; 1393 } 1394 1395 // Parse optional '::' and optional nested-name-specifier. 1396 CXXScopeSpec SS; 1397 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1398 1399 // The location of the base class itself. 1400 SourceLocation BaseLoc = Tok.getLocation(); 1401 1402 // Parse the class-name. 1403 SourceLocation EndLocation; 1404 TypeResult BaseType = ParseClassName(EndLocation, SS); 1405 if (BaseType.isInvalid()) 1406 return true; 1407 1408 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1409 // actually part of the base-specifier-list grammar productions, but we 1410 // parse it here for convenience. 1411 SourceLocation EllipsisLoc; 1412 if (Tok.is(tok::ellipsis)) 1413 EllipsisLoc = ConsumeToken(); 1414 1415 // Find the complete source range for the base-specifier. 1416 SourceRange Range(StartLoc, EndLocation); 1417 1418 // Notify semantic analysis that we have parsed a complete 1419 // base-specifier. 1420 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1421 BaseType.get(), BaseLoc, EllipsisLoc); 1422} 1423 1424/// getAccessSpecifierIfPresent - Determine whether the next token is 1425/// a C++ access-specifier. 1426/// 1427/// access-specifier: [C++ class.derived] 1428/// 'private' 1429/// 'protected' 1430/// 'public' 1431AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1432 switch (Tok.getKind()) { 1433 default: return AS_none; 1434 case tok::kw_private: return AS_private; 1435 case tok::kw_protected: return AS_protected; 1436 case tok::kw_public: return AS_public; 1437 } 1438} 1439 1440void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1441 Decl *ThisDecl) { 1442 // We just declared a member function. If this member function 1443 // has any default arguments, we'll need to parse them later. 1444 LateParsedMethodDeclaration *LateMethod = 0; 1445 DeclaratorChunk::FunctionTypeInfo &FTI 1446 = DeclaratorInfo.getFunctionTypeInfo(); 1447 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1448 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1449 if (!LateMethod) { 1450 // Push this method onto the stack of late-parsed method 1451 // declarations. 1452 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1453 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1454 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1455 1456 // Add all of the parameters prior to this one (they don't 1457 // have default arguments). 1458 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1459 for (unsigned I = 0; I < ParamIdx; ++I) 1460 LateMethod->DefaultArgs.push_back( 1461 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1462 } 1463 1464 // Add this parameter to the list of parameters (it or may 1465 // not have a default argument). 1466 LateMethod->DefaultArgs.push_back( 1467 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1468 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1469 } 1470 } 1471} 1472 1473/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1474/// virt-specifier. 1475/// 1476/// virt-specifier: 1477/// override 1478/// final 1479VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1480 if (!getLang().CPlusPlus) 1481 return VirtSpecifiers::VS_None; 1482 1483 if (Tok.is(tok::identifier)) { 1484 IdentifierInfo *II = Tok.getIdentifierInfo(); 1485 1486 // Initialize the contextual keywords. 1487 if (!Ident_final) { 1488 Ident_final = &PP.getIdentifierTable().get("final"); 1489 Ident_override = &PP.getIdentifierTable().get("override"); 1490 } 1491 1492 if (II == Ident_override) 1493 return VirtSpecifiers::VS_Override; 1494 1495 if (II == Ident_final) 1496 return VirtSpecifiers::VS_Final; 1497 } 1498 1499 return VirtSpecifiers::VS_None; 1500} 1501 1502/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1503/// 1504/// virt-specifier-seq: 1505/// virt-specifier 1506/// virt-specifier-seq virt-specifier 1507void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1508 while (true) { 1509 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1510 if (Specifier == VirtSpecifiers::VS_None) 1511 return; 1512 1513 // C++ [class.mem]p8: 1514 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1515 const char *PrevSpec = 0; 1516 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1517 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1518 << PrevSpec 1519 << FixItHint::CreateRemoval(Tok.getLocation()); 1520 1521 if (!getLang().CPlusPlus0x) 1522 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1523 << VirtSpecifiers::getSpecifierName(Specifier); 1524 ConsumeToken(); 1525 } 1526} 1527 1528/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1529/// contextual 'final' keyword. 1530bool Parser::isCXX0XFinalKeyword() const { 1531 if (!getLang().CPlusPlus) 1532 return false; 1533 1534 if (!Tok.is(tok::identifier)) 1535 return false; 1536 1537 // Initialize the contextual keywords. 1538 if (!Ident_final) { 1539 Ident_final = &PP.getIdentifierTable().get("final"); 1540 Ident_override = &PP.getIdentifierTable().get("override"); 1541 } 1542 1543 return Tok.getIdentifierInfo() == Ident_final; 1544} 1545 1546/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1547/// 1548/// member-declaration: 1549/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1550/// function-definition ';'[opt] 1551/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1552/// using-declaration [TODO] 1553/// [C++0x] static_assert-declaration 1554/// template-declaration 1555/// [GNU] '__extension__' member-declaration 1556/// 1557/// member-declarator-list: 1558/// member-declarator 1559/// member-declarator-list ',' member-declarator 1560/// 1561/// member-declarator: 1562/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1563/// declarator constant-initializer[opt] 1564/// [C++11] declarator brace-or-equal-initializer[opt] 1565/// identifier[opt] ':' constant-expression 1566/// 1567/// virt-specifier-seq: 1568/// virt-specifier 1569/// virt-specifier-seq virt-specifier 1570/// 1571/// virt-specifier: 1572/// override 1573/// final 1574/// new 1575/// 1576/// pure-specifier: 1577/// '= 0' 1578/// 1579/// constant-initializer: 1580/// '=' constant-expression 1581/// 1582void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1583 const ParsedTemplateInfo &TemplateInfo, 1584 ParsingDeclRAIIObject *TemplateDiags) { 1585 if (Tok.is(tok::at)) { 1586 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1587 Diag(Tok, diag::err_at_defs_cxx); 1588 else 1589 Diag(Tok, diag::err_at_in_class); 1590 1591 ConsumeToken(); 1592 SkipUntil(tok::r_brace); 1593 return; 1594 } 1595 1596 // Access declarations. 1597 if (!TemplateInfo.Kind && 1598 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1599 !TryAnnotateCXXScopeToken() && 1600 Tok.is(tok::annot_cxxscope)) { 1601 bool isAccessDecl = false; 1602 if (NextToken().is(tok::identifier)) 1603 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1604 else 1605 isAccessDecl = NextToken().is(tok::kw_operator); 1606 1607 if (isAccessDecl) { 1608 // Collect the scope specifier token we annotated earlier. 1609 CXXScopeSpec SS; 1610 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1611 1612 // Try to parse an unqualified-id. 1613 UnqualifiedId Name; 1614 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1615 SkipUntil(tok::semi); 1616 return; 1617 } 1618 1619 // TODO: recover from mistakenly-qualified operator declarations. 1620 if (ExpectAndConsume(tok::semi, 1621 diag::err_expected_semi_after, 1622 "access declaration", 1623 tok::semi)) 1624 return; 1625 1626 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1627 false, SourceLocation(), 1628 SS, Name, 1629 /* AttrList */ 0, 1630 /* IsTypeName */ false, 1631 SourceLocation()); 1632 return; 1633 } 1634 } 1635 1636 // static_assert-declaration 1637 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1638 // FIXME: Check for templates 1639 SourceLocation DeclEnd; 1640 ParseStaticAssertDeclaration(DeclEnd); 1641 return; 1642 } 1643 1644 if (Tok.is(tok::kw_template)) { 1645 assert(!TemplateInfo.TemplateParams && 1646 "Nested template improperly parsed?"); 1647 SourceLocation DeclEnd; 1648 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1649 AS); 1650 return; 1651 } 1652 1653 // Handle: member-declaration ::= '__extension__' member-declaration 1654 if (Tok.is(tok::kw___extension__)) { 1655 // __extension__ silences extension warnings in the subexpression. 1656 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1657 ConsumeToken(); 1658 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1659 } 1660 1661 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1662 // is a bitfield. 1663 ColonProtectionRAIIObject X(*this); 1664 1665 ParsedAttributesWithRange attrs(AttrFactory); 1666 // Optional C++0x attribute-specifier 1667 MaybeParseCXX0XAttributes(attrs); 1668 MaybeParseMicrosoftAttributes(attrs); 1669 1670 if (Tok.is(tok::kw_using)) { 1671 ProhibitAttributes(attrs); 1672 1673 // Eat 'using'. 1674 SourceLocation UsingLoc = ConsumeToken(); 1675 1676 if (Tok.is(tok::kw_namespace)) { 1677 Diag(UsingLoc, diag::err_using_namespace_in_class); 1678 SkipUntil(tok::semi, true, true); 1679 } else { 1680 SourceLocation DeclEnd; 1681 // Otherwise, it must be a using-declaration or an alias-declaration. 1682 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1683 UsingLoc, DeclEnd, AS); 1684 } 1685 return; 1686 } 1687 1688 // decl-specifier-seq: 1689 // Parse the common declaration-specifiers piece. 1690 ParsingDeclSpec DS(*this, TemplateDiags); 1691 DS.takeAttributesFrom(attrs); 1692 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1693 1694 MultiTemplateParamsArg TemplateParams(Actions, 1695 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1696 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1697 1698 if (Tok.is(tok::semi)) { 1699 ConsumeToken(); 1700 Decl *TheDecl = 1701 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1702 DS.complete(TheDecl); 1703 return; 1704 } 1705 1706 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1707 VirtSpecifiers VS; 1708 ExprResult Init; 1709 1710 if (Tok.isNot(tok::colon)) { 1711 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1712 ColonProtectionRAIIObject X(*this); 1713 1714 // Parse the first declarator. 1715 ParseDeclarator(DeclaratorInfo); 1716 // Error parsing the declarator? 1717 if (!DeclaratorInfo.hasName()) { 1718 // If so, skip until the semi-colon or a }. 1719 SkipUntil(tok::r_brace, true, true); 1720 if (Tok.is(tok::semi)) 1721 ConsumeToken(); 1722 return; 1723 } 1724 1725 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1726 1727 // If attributes exist after the declarator, but before an '{', parse them. 1728 MaybeParseGNUAttributes(DeclaratorInfo); 1729 1730 // MSVC permits pure specifier on inline functions declared at class scope. 1731 // Hence check for =0 before checking for function definition. 1732 if (getLang().Microsoft && Tok.is(tok::equal) && 1733 DeclaratorInfo.isFunctionDeclarator() && 1734 NextToken().is(tok::numeric_constant)) { 1735 ConsumeToken(); 1736 Init = ParseInitializer(); 1737 if (Init.isInvalid()) 1738 SkipUntil(tok::comma, true, true); 1739 } 1740 1741 bool IsDefinition = false; 1742 // function-definition: 1743 // 1744 // In C++11, a non-function declarator followed by an open brace is a 1745 // braced-init-list for an in-class member initialization, not an 1746 // erroneous function definition. 1747 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1748 IsDefinition = true; 1749 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1750 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1751 IsDefinition = true; 1752 } else if (Tok.is(tok::equal)) { 1753 const Token &KW = NextToken(); 1754 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1755 IsDefinition = true; 1756 } 1757 } 1758 1759 if (IsDefinition) { 1760 if (!DeclaratorInfo.isFunctionDeclarator()) { 1761 Diag(Tok, diag::err_func_def_no_params); 1762 ConsumeBrace(); 1763 SkipUntil(tok::r_brace, true); 1764 1765 // Consume the optional ';' 1766 if (Tok.is(tok::semi)) 1767 ConsumeToken(); 1768 return; 1769 } 1770 1771 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1772 Diag(Tok, diag::err_function_declared_typedef); 1773 // This recovery skips the entire function body. It would be nice 1774 // to simply call ParseCXXInlineMethodDef() below, however Sema 1775 // assumes the declarator represents a function, not a typedef. 1776 ConsumeBrace(); 1777 SkipUntil(tok::r_brace, true); 1778 1779 // Consume the optional ';' 1780 if (Tok.is(tok::semi)) 1781 ConsumeToken(); 1782 return; 1783 } 1784 1785 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init); 1786 1787 // Consume the ';' - it's optional unless we have a delete or default 1788 if (Tok.is(tok::semi)) { 1789 ConsumeToken(); 1790 } 1791 1792 return; 1793 } 1794 } 1795 1796 // member-declarator-list: 1797 // member-declarator 1798 // member-declarator-list ',' member-declarator 1799 1800 SmallVector<Decl *, 8> DeclsInGroup; 1801 ExprResult BitfieldSize; 1802 1803 while (1) { 1804 // member-declarator: 1805 // declarator pure-specifier[opt] 1806 // declarator brace-or-equal-initializer[opt] 1807 // identifier[opt] ':' constant-expression 1808 if (Tok.is(tok::colon)) { 1809 ConsumeToken(); 1810 BitfieldSize = ParseConstantExpression(); 1811 if (BitfieldSize.isInvalid()) 1812 SkipUntil(tok::comma, true, true); 1813 } 1814 1815 // If a simple-asm-expr is present, parse it. 1816 if (Tok.is(tok::kw_asm)) { 1817 SourceLocation Loc; 1818 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1819 if (AsmLabel.isInvalid()) 1820 SkipUntil(tok::comma, true, true); 1821 1822 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1823 DeclaratorInfo.SetRangeEnd(Loc); 1824 } 1825 1826 // If attributes exist after the declarator, parse them. 1827 MaybeParseGNUAttributes(DeclaratorInfo); 1828 1829 // FIXME: When g++ adds support for this, we'll need to check whether it 1830 // goes before or after the GNU attributes and __asm__. 1831 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1832 1833 bool HasDeferredInitializer = false; 1834 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) { 1835 if (BitfieldSize.get()) { 1836 Diag(Tok, diag::err_bitfield_member_init); 1837 SkipUntil(tok::comma, true, true); 1838 } else { 1839 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1840 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1841 != DeclSpec::SCS_static && 1842 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1843 != DeclSpec::SCS_typedef; 1844 1845 if (!HasDeferredInitializer) { 1846 SourceLocation EqualLoc; 1847 Init = ParseCXXMemberInitializer( 1848 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 1849 if (Init.isInvalid()) 1850 SkipUntil(tok::comma, true, true); 1851 } 1852 } 1853 } 1854 1855 // NOTE: If Sema is the Action module and declarator is an instance field, 1856 // this call will *not* return the created decl; It will return null. 1857 // See Sema::ActOnCXXMemberDeclarator for details. 1858 1859 Decl *ThisDecl = 0; 1860 if (DS.isFriendSpecified()) { 1861 // TODO: handle initializers, bitfields, 'delete' 1862 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1863 /*IsDefinition*/ false, 1864 move(TemplateParams)); 1865 } else { 1866 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1867 DeclaratorInfo, 1868 move(TemplateParams), 1869 BitfieldSize.release(), 1870 VS, Init.release(), 1871 HasDeferredInitializer, 1872 /*IsDefinition*/ false); 1873 } 1874 if (ThisDecl) 1875 DeclsInGroup.push_back(ThisDecl); 1876 1877 if (DeclaratorInfo.isFunctionDeclarator() && 1878 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1879 != DeclSpec::SCS_typedef) { 1880 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1881 } 1882 1883 DeclaratorInfo.complete(ThisDecl); 1884 1885 if (HasDeferredInitializer) { 1886 if (!getLang().CPlusPlus0x) 1887 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension); 1888 1889 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1890 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1891 // declarator is followed by an initializer. 1892 // 1893 // A brace-or-equal-initializer for a member-declarator is not an 1894 // initializer in the gramamr, so this is ill-formed. 1895 Diag(Tok, diag::err_incomplete_array_member_init); 1896 SkipUntil(tok::comma, true, true); 1897 // Avoid later warnings about a class member of incomplete type. 1898 ThisDecl->setInvalidDecl(); 1899 } else 1900 ParseCXXNonStaticMemberInitializer(ThisDecl); 1901 } 1902 1903 // If we don't have a comma, it is either the end of the list (a ';') 1904 // or an error, bail out. 1905 if (Tok.isNot(tok::comma)) 1906 break; 1907 1908 // Consume the comma. 1909 ConsumeToken(); 1910 1911 // Parse the next declarator. 1912 DeclaratorInfo.clear(); 1913 VS.clear(); 1914 BitfieldSize = 0; 1915 Init = 0; 1916 1917 // Attributes are only allowed on the second declarator. 1918 MaybeParseGNUAttributes(DeclaratorInfo); 1919 1920 if (Tok.isNot(tok::colon)) 1921 ParseDeclarator(DeclaratorInfo); 1922 } 1923 1924 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1925 // Skip to end of block or statement. 1926 SkipUntil(tok::r_brace, true, true); 1927 // If we stopped at a ';', eat it. 1928 if (Tok.is(tok::semi)) ConsumeToken(); 1929 return; 1930 } 1931 1932 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1933 DeclsInGroup.size()); 1934} 1935 1936/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1937/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1938/// function definition. The location of the '=', if any, will be placed in 1939/// EqualLoc. 1940/// 1941/// pure-specifier: 1942/// '= 0' 1943/// 1944/// brace-or-equal-initializer: 1945/// '=' initializer-expression 1946/// braced-init-list [TODO] 1947/// 1948/// initializer-clause: 1949/// assignment-expression 1950/// braced-init-list [TODO] 1951/// 1952/// defaulted/deleted function-definition: 1953/// '=' 'default' 1954/// '=' 'delete' 1955/// 1956/// Prior to C++0x, the assignment-expression in an initializer-clause must 1957/// be a constant-expression. 1958ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1959 SourceLocation &EqualLoc) { 1960 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 1961 && "Data member initializer not starting with '=' or '{'"); 1962 1963 if (Tok.is(tok::equal)) { 1964 EqualLoc = ConsumeToken(); 1965 if (Tok.is(tok::kw_delete)) { 1966 // In principle, an initializer of '= delete p;' is legal, but it will 1967 // never type-check. It's better to diagnose it as an ill-formed expression 1968 // than as an ill-formed deleted non-function member. 1969 // An initializer of '= delete p, foo' will never be parsed, because 1970 // a top-level comma always ends the initializer expression. 1971 const Token &Next = NextToken(); 1972 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 1973 Next.is(tok::eof)) { 1974 if (IsFunction) 1975 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1976 << 1 /* delete */; 1977 else 1978 Diag(ConsumeToken(), diag::err_deleted_non_function); 1979 return ExprResult(); 1980 } 1981 } else if (Tok.is(tok::kw_default)) { 1982 Diag(ConsumeToken(), diag::err_default_special_members); 1983 if (IsFunction) 1984 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 1985 << 0 /* default */; 1986 else 1987 Diag(ConsumeToken(), diag::err_default_special_members); 1988 return ExprResult(); 1989 } 1990 1991 return ParseInitializer(); 1992 } else 1993 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 1994} 1995 1996/// ParseCXXMemberSpecification - Parse the class definition. 1997/// 1998/// member-specification: 1999/// member-declaration member-specification[opt] 2000/// access-specifier ':' member-specification[opt] 2001/// 2002void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2003 unsigned TagType, Decl *TagDecl) { 2004 assert((TagType == DeclSpec::TST_struct || 2005 TagType == DeclSpec::TST_union || 2006 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2007 2008 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2009 "parsing struct/union/class body"); 2010 2011 // Determine whether this is a non-nested class. Note that local 2012 // classes are *not* considered to be nested classes. 2013 bool NonNestedClass = true; 2014 if (!ClassStack.empty()) { 2015 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2016 if (S->isClassScope()) { 2017 // We're inside a class scope, so this is a nested class. 2018 NonNestedClass = false; 2019 break; 2020 } 2021 2022 if ((S->getFlags() & Scope::FnScope)) { 2023 // If we're in a function or function template declared in the 2024 // body of a class, then this is a local class rather than a 2025 // nested class. 2026 const Scope *Parent = S->getParent(); 2027 if (Parent->isTemplateParamScope()) 2028 Parent = Parent->getParent(); 2029 if (Parent->isClassScope()) 2030 break; 2031 } 2032 } 2033 } 2034 2035 // Enter a scope for the class. 2036 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2037 2038 // Note that we are parsing a new (potentially-nested) class definition. 2039 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2040 2041 if (TagDecl) 2042 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2043 2044 SourceLocation FinalLoc; 2045 2046 // Parse the optional 'final' keyword. 2047 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2048 IdentifierInfo *II = Tok.getIdentifierInfo(); 2049 2050 // Initialize the contextual keywords. 2051 if (!Ident_final) { 2052 Ident_final = &PP.getIdentifierTable().get("final"); 2053 Ident_override = &PP.getIdentifierTable().get("override"); 2054 } 2055 2056 if (II == Ident_final) 2057 FinalLoc = ConsumeToken(); 2058 2059 if (!getLang().CPlusPlus0x) 2060 Diag(FinalLoc, diag::ext_override_control_keyword) << "final"; 2061 } 2062 2063 if (Tok.is(tok::colon)) { 2064 ParseBaseClause(TagDecl); 2065 2066 if (!Tok.is(tok::l_brace)) { 2067 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2068 2069 if (TagDecl) 2070 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2071 return; 2072 } 2073 } 2074 2075 assert(Tok.is(tok::l_brace)); 2076 2077 SourceLocation LBraceLoc = ConsumeBrace(); 2078 2079 if (TagDecl) 2080 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2081 LBraceLoc); 2082 2083 // C++ 11p3: Members of a class defined with the keyword class are private 2084 // by default. Members of a class defined with the keywords struct or union 2085 // are public by default. 2086 AccessSpecifier CurAS; 2087 if (TagType == DeclSpec::TST_class) 2088 CurAS = AS_private; 2089 else 2090 CurAS = AS_public; 2091 2092 SourceLocation RBraceLoc; 2093 if (TagDecl) { 2094 // While we still have something to read, read the member-declarations. 2095 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2096 // Each iteration of this loop reads one member-declaration. 2097 2098 if (getLang().Microsoft && (Tok.is(tok::kw___if_exists) || 2099 Tok.is(tok::kw___if_not_exists))) { 2100 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2101 continue; 2102 } 2103 2104 // Check for extraneous top-level semicolon. 2105 if (Tok.is(tok::semi)) { 2106 Diag(Tok, diag::ext_extra_struct_semi) 2107 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2108 << FixItHint::CreateRemoval(Tok.getLocation()); 2109 ConsumeToken(); 2110 continue; 2111 } 2112 2113 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2114 if (AS != AS_none) { 2115 // Current token is a C++ access specifier. 2116 CurAS = AS; 2117 SourceLocation ASLoc = Tok.getLocation(); 2118 ConsumeToken(); 2119 if (Tok.is(tok::colon)) 2120 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2121 else 2122 Diag(Tok, diag::err_expected_colon); 2123 ConsumeToken(); 2124 continue; 2125 } 2126 2127 // FIXME: Make sure we don't have a template here. 2128 2129 // Parse all the comma separated declarators. 2130 ParseCXXClassMemberDeclaration(CurAS); 2131 } 2132 2133 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 2134 } else { 2135 SkipUntil(tok::r_brace, false, false); 2136 } 2137 2138 // If attributes exist after class contents, parse them. 2139 ParsedAttributes attrs(AttrFactory); 2140 MaybeParseGNUAttributes(attrs); 2141 2142 if (TagDecl) 2143 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2144 LBraceLoc, RBraceLoc, 2145 attrs.getList()); 2146 2147 // C++0x [class.mem]p2: Within the class member-specification, the class is 2148 // regarded as complete within function bodies, default arguments, exception- 2149 // specifications, and brace-or-equal-initializers for non-static data 2150 // members (including such things in nested classes). 2151 // 2152 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2153 // handled. Fix the others! 2154 if (TagDecl && NonNestedClass) { 2155 // We are not inside a nested class. This class and its nested classes 2156 // are complete and we can parse the delayed portions of method 2157 // declarations and the lexed inline method definitions. 2158 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2159 ParseLexedMethodDeclarations(getCurrentClass()); 2160 ParseLexedMemberInitializers(getCurrentClass()); 2161 ParseLexedMethodDefs(getCurrentClass()); 2162 PrevTokLocation = SavedPrevTokLocation; 2163 } 2164 2165 if (TagDecl) 2166 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 2167 2168 // Leave the class scope. 2169 ParsingDef.Pop(); 2170 ClassScope.Exit(); 2171} 2172 2173/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2174/// which explicitly initializes the members or base classes of a 2175/// class (C++ [class.base.init]). For example, the three initializers 2176/// after the ':' in the Derived constructor below: 2177/// 2178/// @code 2179/// class Base { }; 2180/// class Derived : Base { 2181/// int x; 2182/// float f; 2183/// public: 2184/// Derived(float f) : Base(), x(17), f(f) { } 2185/// }; 2186/// @endcode 2187/// 2188/// [C++] ctor-initializer: 2189/// ':' mem-initializer-list 2190/// 2191/// [C++] mem-initializer-list: 2192/// mem-initializer ...[opt] 2193/// mem-initializer ...[opt] , mem-initializer-list 2194void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2195 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2196 2197 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2198 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2199 SourceLocation ColonLoc = ConsumeToken(); 2200 2201 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2202 bool AnyErrors = false; 2203 2204 do { 2205 if (Tok.is(tok::code_completion)) { 2206 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2207 MemInitializers.data(), 2208 MemInitializers.size()); 2209 return cutOffParsing(); 2210 } else { 2211 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2212 if (!MemInit.isInvalid()) 2213 MemInitializers.push_back(MemInit.get()); 2214 else 2215 AnyErrors = true; 2216 } 2217 2218 if (Tok.is(tok::comma)) 2219 ConsumeToken(); 2220 else if (Tok.is(tok::l_brace)) 2221 break; 2222 // If the next token looks like a base or member initializer, assume that 2223 // we're just missing a comma. 2224 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2225 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2226 Diag(Loc, diag::err_ctor_init_missing_comma) 2227 << FixItHint::CreateInsertion(Loc, ", "); 2228 } else { 2229 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2230 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2231 SkipUntil(tok::l_brace, true, true); 2232 break; 2233 } 2234 } while (true); 2235 2236 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2237 MemInitializers.data(), MemInitializers.size(), 2238 AnyErrors); 2239} 2240 2241/// ParseMemInitializer - Parse a C++ member initializer, which is 2242/// part of a constructor initializer that explicitly initializes one 2243/// member or base class (C++ [class.base.init]). See 2244/// ParseConstructorInitializer for an example. 2245/// 2246/// [C++] mem-initializer: 2247/// mem-initializer-id '(' expression-list[opt] ')' 2248/// [C++0x] mem-initializer-id braced-init-list 2249/// 2250/// [C++] mem-initializer-id: 2251/// '::'[opt] nested-name-specifier[opt] class-name 2252/// identifier 2253Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2254 // parse '::'[opt] nested-name-specifier[opt] 2255 CXXScopeSpec SS; 2256 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2257 ParsedType TemplateTypeTy; 2258 if (Tok.is(tok::annot_template_id)) { 2259 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2260 if (TemplateId->Kind == TNK_Type_template || 2261 TemplateId->Kind == TNK_Dependent_template_name) { 2262 AnnotateTemplateIdTokenAsType(); 2263 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2264 TemplateTypeTy = getTypeAnnotation(Tok); 2265 } 2266 } 2267 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2268 Diag(Tok, diag::err_expected_member_or_base_name); 2269 return true; 2270 } 2271 2272 // Get the identifier. This may be a member name or a class name, 2273 // but we'll let the semantic analysis determine which it is. 2274 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2275 SourceLocation IdLoc = ConsumeToken(); 2276 2277 // Parse the '('. 2278 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2279 // FIXME: Do something with the braced-init-list. 2280 ParseBraceInitializer(); 2281 return true; 2282 } else if(Tok.is(tok::l_paren)) { 2283 SourceLocation LParenLoc = ConsumeParen(); 2284 2285 // Parse the optional expression-list. 2286 ExprVector ArgExprs(Actions); 2287 CommaLocsTy CommaLocs; 2288 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2289 SkipUntil(tok::r_paren); 2290 return true; 2291 } 2292 2293 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2294 2295 SourceLocation EllipsisLoc; 2296 if (Tok.is(tok::ellipsis)) 2297 EllipsisLoc = ConsumeToken(); 2298 2299 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2300 TemplateTypeTy, IdLoc, 2301 LParenLoc, ArgExprs.take(), 2302 ArgExprs.size(), RParenLoc, 2303 EllipsisLoc); 2304 } 2305 2306 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2307 : diag::err_expected_lparen); 2308 return true; 2309} 2310 2311/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2312/// 2313/// exception-specification: 2314/// dynamic-exception-specification 2315/// noexcept-specification 2316/// 2317/// noexcept-specification: 2318/// 'noexcept' 2319/// 'noexcept' '(' constant-expression ')' 2320ExceptionSpecificationType 2321Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2322 SmallVectorImpl<ParsedType> &DynamicExceptions, 2323 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2324 ExprResult &NoexceptExpr) { 2325 ExceptionSpecificationType Result = EST_None; 2326 2327 // See if there's a dynamic specification. 2328 if (Tok.is(tok::kw_throw)) { 2329 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2330 DynamicExceptions, 2331 DynamicExceptionRanges); 2332 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2333 "Produced different number of exception types and ranges."); 2334 } 2335 2336 // If there's no noexcept specification, we're done. 2337 if (Tok.isNot(tok::kw_noexcept)) 2338 return Result; 2339 2340 // If we already had a dynamic specification, parse the noexcept for, 2341 // recovery, but emit a diagnostic and don't store the results. 2342 SourceRange NoexceptRange; 2343 ExceptionSpecificationType NoexceptType = EST_None; 2344 2345 SourceLocation KeywordLoc = ConsumeToken(); 2346 if (Tok.is(tok::l_paren)) { 2347 // There is an argument. 2348 SourceLocation LParenLoc = ConsumeParen(); 2349 NoexceptType = EST_ComputedNoexcept; 2350 NoexceptExpr = ParseConstantExpression(); 2351 // The argument must be contextually convertible to bool. We use 2352 // ActOnBooleanCondition for this purpose. 2353 if (!NoexceptExpr.isInvalid()) 2354 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2355 NoexceptExpr.get()); 2356 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2357 NoexceptRange = SourceRange(KeywordLoc, RParenLoc); 2358 } else { 2359 // There is no argument. 2360 NoexceptType = EST_BasicNoexcept; 2361 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2362 } 2363 2364 if (Result == EST_None) { 2365 SpecificationRange = NoexceptRange; 2366 Result = NoexceptType; 2367 2368 // If there's a dynamic specification after a noexcept specification, 2369 // parse that and ignore the results. 2370 if (Tok.is(tok::kw_throw)) { 2371 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2372 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2373 DynamicExceptionRanges); 2374 } 2375 } else { 2376 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2377 } 2378 2379 return Result; 2380} 2381 2382/// ParseDynamicExceptionSpecification - Parse a C++ 2383/// dynamic-exception-specification (C++ [except.spec]). 2384/// 2385/// dynamic-exception-specification: 2386/// 'throw' '(' type-id-list [opt] ')' 2387/// [MS] 'throw' '(' '...' ')' 2388/// 2389/// type-id-list: 2390/// type-id ... [opt] 2391/// type-id-list ',' type-id ... [opt] 2392/// 2393ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2394 SourceRange &SpecificationRange, 2395 SmallVectorImpl<ParsedType> &Exceptions, 2396 SmallVectorImpl<SourceRange> &Ranges) { 2397 assert(Tok.is(tok::kw_throw) && "expected throw"); 2398 2399 SpecificationRange.setBegin(ConsumeToken()); 2400 2401 if (!Tok.is(tok::l_paren)) { 2402 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2403 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2404 return EST_DynamicNone; 2405 } 2406 SourceLocation LParenLoc = ConsumeParen(); 2407 2408 // Parse throw(...), a Microsoft extension that means "this function 2409 // can throw anything". 2410 if (Tok.is(tok::ellipsis)) { 2411 SourceLocation EllipsisLoc = ConsumeToken(); 2412 if (!getLang().Microsoft) 2413 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2414 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2415 SpecificationRange.setEnd(RParenLoc); 2416 return EST_MSAny; 2417 } 2418 2419 // Parse the sequence of type-ids. 2420 SourceRange Range; 2421 while (Tok.isNot(tok::r_paren)) { 2422 TypeResult Res(ParseTypeName(&Range)); 2423 2424 if (Tok.is(tok::ellipsis)) { 2425 // C++0x [temp.variadic]p5: 2426 // - In a dynamic-exception-specification (15.4); the pattern is a 2427 // type-id. 2428 SourceLocation Ellipsis = ConsumeToken(); 2429 Range.setEnd(Ellipsis); 2430 if (!Res.isInvalid()) 2431 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2432 } 2433 2434 if (!Res.isInvalid()) { 2435 Exceptions.push_back(Res.get()); 2436 Ranges.push_back(Range); 2437 } 2438 2439 if (Tok.is(tok::comma)) 2440 ConsumeToken(); 2441 else 2442 break; 2443 } 2444 2445 SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc)); 2446 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2447} 2448 2449/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2450/// function declaration. 2451TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2452 assert(Tok.is(tok::arrow) && "expected arrow"); 2453 2454 ConsumeToken(); 2455 2456 // FIXME: Need to suppress declarations when parsing this typename. 2457 // Otherwise in this function definition: 2458 // 2459 // auto f() -> struct X {} 2460 // 2461 // struct X is parsed as class definition because of the trailing 2462 // brace. 2463 return ParseTypeName(&Range); 2464} 2465 2466/// \brief We have just started parsing the definition of a new class, 2467/// so push that class onto our stack of classes that is currently 2468/// being parsed. 2469Sema::ParsingClassState 2470Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2471 assert((NonNestedClass || !ClassStack.empty()) && 2472 "Nested class without outer class"); 2473 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2474 return Actions.PushParsingClass(); 2475} 2476 2477/// \brief Deallocate the given parsed class and all of its nested 2478/// classes. 2479void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2480 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2481 delete Class->LateParsedDeclarations[I]; 2482 delete Class; 2483} 2484 2485/// \brief Pop the top class of the stack of classes that are 2486/// currently being parsed. 2487/// 2488/// This routine should be called when we have finished parsing the 2489/// definition of a class, but have not yet popped the Scope 2490/// associated with the class's definition. 2491/// 2492/// \returns true if the class we've popped is a top-level class, 2493/// false otherwise. 2494void Parser::PopParsingClass(Sema::ParsingClassState state) { 2495 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2496 2497 Actions.PopParsingClass(state); 2498 2499 ParsingClass *Victim = ClassStack.top(); 2500 ClassStack.pop(); 2501 if (Victim->TopLevelClass) { 2502 // Deallocate all of the nested classes of this class, 2503 // recursively: we don't need to keep any of this information. 2504 DeallocateParsedClasses(Victim); 2505 return; 2506 } 2507 assert(!ClassStack.empty() && "Missing top-level class?"); 2508 2509 if (Victim->LateParsedDeclarations.empty()) { 2510 // The victim is a nested class, but we will not need to perform 2511 // any processing after the definition of this class since it has 2512 // no members whose handling was delayed. Therefore, we can just 2513 // remove this nested class. 2514 DeallocateParsedClasses(Victim); 2515 return; 2516 } 2517 2518 // This nested class has some members that will need to be processed 2519 // after the top-level class is completely defined. Therefore, add 2520 // it to the list of nested classes within its parent. 2521 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2522 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2523 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2524} 2525 2526/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2527/// parses standard attributes. 2528/// 2529/// [C++0x] attribute-specifier: 2530/// '[' '[' attribute-list ']' ']' 2531/// 2532/// [C++0x] attribute-list: 2533/// attribute[opt] 2534/// attribute-list ',' attribute[opt] 2535/// 2536/// [C++0x] attribute: 2537/// attribute-token attribute-argument-clause[opt] 2538/// 2539/// [C++0x] attribute-token: 2540/// identifier 2541/// attribute-scoped-token 2542/// 2543/// [C++0x] attribute-scoped-token: 2544/// attribute-namespace '::' identifier 2545/// 2546/// [C++0x] attribute-namespace: 2547/// identifier 2548/// 2549/// [C++0x] attribute-argument-clause: 2550/// '(' balanced-token-seq ')' 2551/// 2552/// [C++0x] balanced-token-seq: 2553/// balanced-token 2554/// balanced-token-seq balanced-token 2555/// 2556/// [C++0x] balanced-token: 2557/// '(' balanced-token-seq ')' 2558/// '[' balanced-token-seq ']' 2559/// '{' balanced-token-seq '}' 2560/// any token but '(', ')', '[', ']', '{', or '}' 2561void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2562 SourceLocation *endLoc) { 2563 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2564 && "Not a C++0x attribute list"); 2565 2566 SourceLocation StartLoc = Tok.getLocation(), Loc; 2567 2568 ConsumeBracket(); 2569 ConsumeBracket(); 2570 2571 if (Tok.is(tok::comma)) { 2572 Diag(Tok.getLocation(), diag::err_expected_ident); 2573 ConsumeToken(); 2574 } 2575 2576 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2577 // attribute not present 2578 if (Tok.is(tok::comma)) { 2579 ConsumeToken(); 2580 continue; 2581 } 2582 2583 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2584 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2585 2586 // scoped attribute 2587 if (Tok.is(tok::coloncolon)) { 2588 ConsumeToken(); 2589 2590 if (!Tok.is(tok::identifier)) { 2591 Diag(Tok.getLocation(), diag::err_expected_ident); 2592 SkipUntil(tok::r_square, tok::comma, true, true); 2593 continue; 2594 } 2595 2596 ScopeName = AttrName; 2597 ScopeLoc = AttrLoc; 2598 2599 AttrName = Tok.getIdentifierInfo(); 2600 AttrLoc = ConsumeToken(); 2601 } 2602 2603 bool AttrParsed = false; 2604 // No scoped names are supported; ideally we could put all non-standard 2605 // attributes into namespaces. 2606 if (!ScopeName) { 2607 switch(AttributeList::getKind(AttrName)) 2608 { 2609 // No arguments 2610 case AttributeList::AT_carries_dependency: 2611 case AttributeList::AT_noreturn: { 2612 if (Tok.is(tok::l_paren)) { 2613 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2614 << AttrName->getName(); 2615 break; 2616 } 2617 2618 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2619 SourceLocation(), 0, 0, false, true); 2620 AttrParsed = true; 2621 break; 2622 } 2623 2624 // One argument; must be a type-id or assignment-expression 2625 case AttributeList::AT_aligned: { 2626 if (Tok.isNot(tok::l_paren)) { 2627 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2628 << AttrName->getName(); 2629 break; 2630 } 2631 SourceLocation ParamLoc = ConsumeParen(); 2632 2633 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2634 2635 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2636 2637 ExprVector ArgExprs(Actions); 2638 ArgExprs.push_back(ArgExpr.release()); 2639 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 2640 0, ParamLoc, ArgExprs.take(), 1, 2641 false, true); 2642 2643 AttrParsed = true; 2644 break; 2645 } 2646 2647 // Silence warnings 2648 default: break; 2649 } 2650 } 2651 2652 // Skip the entire parameter clause, if any 2653 if (!AttrParsed && Tok.is(tok::l_paren)) { 2654 ConsumeParen(); 2655 // SkipUntil maintains the balancedness of tokens. 2656 SkipUntil(tok::r_paren, false); 2657 } 2658 } 2659 2660 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2661 SkipUntil(tok::r_square, false); 2662 Loc = Tok.getLocation(); 2663 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2664 SkipUntil(tok::r_square, false); 2665 2666 attrs.Range = SourceRange(StartLoc, Loc); 2667} 2668 2669/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2670/// attribute. 2671/// 2672/// FIXME: Simply returns an alignof() expression if the argument is a 2673/// type. Ideally, the type should be propagated directly into Sema. 2674/// 2675/// [C++0x] 'align' '(' type-id ')' 2676/// [C++0x] 'align' '(' assignment-expression ')' 2677ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2678 if (isTypeIdInParens()) { 2679 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2680 SourceLocation TypeLoc = Tok.getLocation(); 2681 ParsedType Ty = ParseTypeName().get(); 2682 SourceRange TypeRange(Start, Tok.getLocation()); 2683 return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true, 2684 Ty.getAsOpaquePtr(), TypeRange); 2685 } else 2686 return ParseConstantExpression(); 2687} 2688 2689/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2690/// 2691/// [MS] ms-attribute: 2692/// '[' token-seq ']' 2693/// 2694/// [MS] ms-attribute-seq: 2695/// ms-attribute[opt] 2696/// ms-attribute ms-attribute-seq 2697void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2698 SourceLocation *endLoc) { 2699 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2700 2701 while (Tok.is(tok::l_square)) { 2702 ConsumeBracket(); 2703 SkipUntil(tok::r_square, true, true); 2704 if (endLoc) *endLoc = Tok.getLocation(); 2705 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2706 } 2707} 2708 2709void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2710 AccessSpecifier& CurAS) { 2711 bool Result; 2712 if (ParseMicrosoftIfExistsCondition(Result)) 2713 return; 2714 2715 if (Tok.isNot(tok::l_brace)) { 2716 Diag(Tok, diag::err_expected_lbrace); 2717 return; 2718 } 2719 ConsumeBrace(); 2720 2721 // Condition is false skip all inside the {}. 2722 if (!Result) { 2723 SkipUntil(tok::r_brace, false); 2724 return; 2725 } 2726 2727 // Condition is true, parse the declaration. 2728 while (Tok.isNot(tok::r_brace)) { 2729 2730 // __if_exists, __if_not_exists can nest. 2731 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2732 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2733 continue; 2734 } 2735 2736 // Check for extraneous top-level semicolon. 2737 if (Tok.is(tok::semi)) { 2738 Diag(Tok, diag::ext_extra_struct_semi) 2739 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2740 << FixItHint::CreateRemoval(Tok.getLocation()); 2741 ConsumeToken(); 2742 continue; 2743 } 2744 2745 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2746 if (AS != AS_none) { 2747 // Current token is a C++ access specifier. 2748 CurAS = AS; 2749 SourceLocation ASLoc = Tok.getLocation(); 2750 ConsumeToken(); 2751 if (Tok.is(tok::colon)) 2752 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2753 else 2754 Diag(Tok, diag::err_expected_colon); 2755 ConsumeToken(); 2756 continue; 2757 } 2758 2759 // Parse all the comma separated declarators. 2760 ParseCXXClassMemberDeclaration(CurAS); 2761 } 2762 2763 if (Tok.isNot(tok::r_brace)) { 2764 Diag(Tok, diag::err_expected_rbrace); 2765 return; 2766 } 2767 ConsumeBrace(); 2768} 2769