ParseDeclCXX.cpp revision 62ec1f2fd7368542bb926c04797fb07023547694
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, DS.getModulePrivateSpecLoc(), 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 DS.getModulePrivateSpecLoc(), 1197 TParams, Owned, IsDependent, false, 1198 false, clang::TypeResult()); 1199 1200 // If ActOnTag said the type was dependent, try again with the 1201 // less common call. 1202 if (IsDependent) { 1203 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1204 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1205 SS, Name, StartLoc, NameLoc); 1206 } 1207 } 1208 1209 // If there is a body, parse it and inform the actions module. 1210 if (TUK == Sema::TUK_Definition) { 1211 assert(Tok.is(tok::l_brace) || 1212 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1213 isCXX0XFinalKeyword()); 1214 if (getLang().CPlusPlus) 1215 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1216 else 1217 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1218 } 1219 1220 const char *PrevSpec = 0; 1221 unsigned DiagID; 1222 bool Result; 1223 if (!TypeResult.isInvalid()) { 1224 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1225 NameLoc.isValid() ? NameLoc : StartLoc, 1226 PrevSpec, DiagID, TypeResult.get()); 1227 } else if (!TagOrTempResult.isInvalid()) { 1228 Result = DS.SetTypeSpecType(TagType, StartLoc, 1229 NameLoc.isValid() ? NameLoc : StartLoc, 1230 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1231 } else { 1232 DS.SetTypeSpecError(); 1233 return; 1234 } 1235 1236 if (Result) 1237 Diag(StartLoc, DiagID) << PrevSpec; 1238 1239 // At this point, we've successfully parsed a class-specifier in 'definition' 1240 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1241 // going to look at what comes after it to improve error recovery. If an 1242 // impossible token occurs next, we assume that the programmer forgot a ; at 1243 // the end of the declaration and recover that way. 1244 // 1245 // This switch enumerates the valid "follow" set for definition. 1246 if (TUK == Sema::TUK_Definition) { 1247 bool ExpectedSemi = true; 1248 switch (Tok.getKind()) { 1249 default: break; 1250 case tok::semi: // struct foo {...} ; 1251 case tok::star: // struct foo {...} * P; 1252 case tok::amp: // struct foo {...} & R = ... 1253 case tok::identifier: // struct foo {...} V ; 1254 case tok::r_paren: //(struct foo {...} ) {4} 1255 case tok::annot_cxxscope: // struct foo {...} a:: b; 1256 case tok::annot_typename: // struct foo {...} a ::b; 1257 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1258 case tok::l_paren: // struct foo {...} ( x); 1259 case tok::comma: // __builtin_offsetof(struct foo{...} , 1260 ExpectedSemi = false; 1261 break; 1262 // Type qualifiers 1263 case tok::kw_const: // struct foo {...} const x; 1264 case tok::kw_volatile: // struct foo {...} volatile x; 1265 case tok::kw_restrict: // struct foo {...} restrict x; 1266 case tok::kw_inline: // struct foo {...} inline foo() {}; 1267 // Storage-class specifiers 1268 case tok::kw_static: // struct foo {...} static x; 1269 case tok::kw_extern: // struct foo {...} extern x; 1270 case tok::kw_typedef: // struct foo {...} typedef x; 1271 case tok::kw_register: // struct foo {...} register x; 1272 case tok::kw_auto: // struct foo {...} auto x; 1273 case tok::kw_mutable: // struct foo {...} mutable x; 1274 case tok::kw_constexpr: // struct foo {...} constexpr x; 1275 // As shown above, type qualifiers and storage class specifiers absolutely 1276 // can occur after class specifiers according to the grammar. However, 1277 // almost no one actually writes code like this. If we see one of these, 1278 // it is much more likely that someone missed a semi colon and the 1279 // type/storage class specifier we're seeing is part of the *next* 1280 // intended declaration, as in: 1281 // 1282 // struct foo { ... } 1283 // typedef int X; 1284 // 1285 // We'd really like to emit a missing semicolon error instead of emitting 1286 // an error on the 'int' saying that you can't have two type specifiers in 1287 // the same declaration of X. Because of this, we look ahead past this 1288 // token to see if it's a type specifier. If so, we know the code is 1289 // otherwise invalid, so we can produce the expected semi error. 1290 if (!isKnownToBeTypeSpecifier(NextToken())) 1291 ExpectedSemi = false; 1292 break; 1293 1294 case tok::r_brace: // struct bar { struct foo {...} } 1295 // Missing ';' at end of struct is accepted as an extension in C mode. 1296 if (!getLang().CPlusPlus) 1297 ExpectedSemi = false; 1298 break; 1299 } 1300 1301 // C++ [temp]p3 In a template-declaration which defines a class, no 1302 // declarator is permitted. 1303 if (TemplateInfo.Kind) 1304 ExpectedSemi = true; 1305 1306 if (ExpectedSemi) { 1307 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1308 TagType == DeclSpec::TST_class ? "class" 1309 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1310 // Push this token back into the preprocessor and change our current token 1311 // to ';' so that the rest of the code recovers as though there were an 1312 // ';' after the definition. 1313 PP.EnterToken(Tok); 1314 Tok.setKind(tok::semi); 1315 } 1316 } 1317} 1318 1319/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1320/// 1321/// base-clause : [C++ class.derived] 1322/// ':' base-specifier-list 1323/// base-specifier-list: 1324/// base-specifier '...'[opt] 1325/// base-specifier-list ',' base-specifier '...'[opt] 1326void Parser::ParseBaseClause(Decl *ClassDecl) { 1327 assert(Tok.is(tok::colon) && "Not a base clause"); 1328 ConsumeToken(); 1329 1330 // Build up an array of parsed base specifiers. 1331 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1332 1333 while (true) { 1334 // Parse a base-specifier. 1335 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1336 if (Result.isInvalid()) { 1337 // Skip the rest of this base specifier, up until the comma or 1338 // opening brace. 1339 SkipUntil(tok::comma, tok::l_brace, true, true); 1340 } else { 1341 // Add this to our array of base specifiers. 1342 BaseInfo.push_back(Result.get()); 1343 } 1344 1345 // If the next token is a comma, consume it and keep reading 1346 // base-specifiers. 1347 if (Tok.isNot(tok::comma)) break; 1348 1349 // Consume the comma. 1350 ConsumeToken(); 1351 } 1352 1353 // Attach the base specifiers 1354 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1355} 1356 1357/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1358/// one entry in the base class list of a class specifier, for example: 1359/// class foo : public bar, virtual private baz { 1360/// 'public bar' and 'virtual private baz' are each base-specifiers. 1361/// 1362/// base-specifier: [C++ class.derived] 1363/// ::[opt] nested-name-specifier[opt] class-name 1364/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1365/// class-name 1366/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1367/// class-name 1368Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1369 bool IsVirtual = false; 1370 SourceLocation StartLoc = Tok.getLocation(); 1371 1372 // Parse the 'virtual' keyword. 1373 if (Tok.is(tok::kw_virtual)) { 1374 ConsumeToken(); 1375 IsVirtual = true; 1376 } 1377 1378 // Parse an (optional) access specifier. 1379 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1380 if (Access != AS_none) 1381 ConsumeToken(); 1382 1383 // Parse the 'virtual' keyword (again!), in case it came after the 1384 // access specifier. 1385 if (Tok.is(tok::kw_virtual)) { 1386 SourceLocation VirtualLoc = ConsumeToken(); 1387 if (IsVirtual) { 1388 // Complain about duplicate 'virtual' 1389 Diag(VirtualLoc, diag::err_dup_virtual) 1390 << FixItHint::CreateRemoval(VirtualLoc); 1391 } 1392 1393 IsVirtual = true; 1394 } 1395 1396 // Parse optional '::' and optional nested-name-specifier. 1397 CXXScopeSpec SS; 1398 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1399 1400 // The location of the base class itself. 1401 SourceLocation BaseLoc = Tok.getLocation(); 1402 1403 // Parse the class-name. 1404 SourceLocation EndLocation; 1405 TypeResult BaseType = ParseClassName(EndLocation, SS); 1406 if (BaseType.isInvalid()) 1407 return true; 1408 1409 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1410 // actually part of the base-specifier-list grammar productions, but we 1411 // parse it here for convenience. 1412 SourceLocation EllipsisLoc; 1413 if (Tok.is(tok::ellipsis)) 1414 EllipsisLoc = ConsumeToken(); 1415 1416 // Find the complete source range for the base-specifier. 1417 SourceRange Range(StartLoc, EndLocation); 1418 1419 // Notify semantic analysis that we have parsed a complete 1420 // base-specifier. 1421 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1422 BaseType.get(), BaseLoc, EllipsisLoc); 1423} 1424 1425/// getAccessSpecifierIfPresent - Determine whether the next token is 1426/// a C++ access-specifier. 1427/// 1428/// access-specifier: [C++ class.derived] 1429/// 'private' 1430/// 'protected' 1431/// 'public' 1432AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1433 switch (Tok.getKind()) { 1434 default: return AS_none; 1435 case tok::kw_private: return AS_private; 1436 case tok::kw_protected: return AS_protected; 1437 case tok::kw_public: return AS_public; 1438 } 1439} 1440 1441void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1442 Decl *ThisDecl) { 1443 // We just declared a member function. If this member function 1444 // has any default arguments, we'll need to parse them later. 1445 LateParsedMethodDeclaration *LateMethod = 0; 1446 DeclaratorChunk::FunctionTypeInfo &FTI 1447 = DeclaratorInfo.getFunctionTypeInfo(); 1448 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1449 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1450 if (!LateMethod) { 1451 // Push this method onto the stack of late-parsed method 1452 // declarations. 1453 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1454 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1455 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1456 1457 // Add all of the parameters prior to this one (they don't 1458 // have default arguments). 1459 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1460 for (unsigned I = 0; I < ParamIdx; ++I) 1461 LateMethod->DefaultArgs.push_back( 1462 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1463 } 1464 1465 // Add this parameter to the list of parameters (it or may 1466 // not have a default argument). 1467 LateMethod->DefaultArgs.push_back( 1468 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1469 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1470 } 1471 } 1472} 1473 1474/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1475/// virt-specifier. 1476/// 1477/// virt-specifier: 1478/// override 1479/// final 1480VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1481 if (!getLang().CPlusPlus) 1482 return VirtSpecifiers::VS_None; 1483 1484 if (Tok.is(tok::identifier)) { 1485 IdentifierInfo *II = Tok.getIdentifierInfo(); 1486 1487 // Initialize the contextual keywords. 1488 if (!Ident_final) { 1489 Ident_final = &PP.getIdentifierTable().get("final"); 1490 Ident_override = &PP.getIdentifierTable().get("override"); 1491 } 1492 1493 if (II == Ident_override) 1494 return VirtSpecifiers::VS_Override; 1495 1496 if (II == Ident_final) 1497 return VirtSpecifiers::VS_Final; 1498 } 1499 1500 return VirtSpecifiers::VS_None; 1501} 1502 1503/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1504/// 1505/// virt-specifier-seq: 1506/// virt-specifier 1507/// virt-specifier-seq virt-specifier 1508void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1509 while (true) { 1510 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1511 if (Specifier == VirtSpecifiers::VS_None) 1512 return; 1513 1514 // C++ [class.mem]p8: 1515 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1516 const char *PrevSpec = 0; 1517 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1518 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1519 << PrevSpec 1520 << FixItHint::CreateRemoval(Tok.getLocation()); 1521 1522 if (!getLang().CPlusPlus0x) 1523 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1524 << VirtSpecifiers::getSpecifierName(Specifier); 1525 ConsumeToken(); 1526 } 1527} 1528 1529/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1530/// contextual 'final' keyword. 1531bool Parser::isCXX0XFinalKeyword() const { 1532 if (!getLang().CPlusPlus) 1533 return false; 1534 1535 if (!Tok.is(tok::identifier)) 1536 return false; 1537 1538 // Initialize the contextual keywords. 1539 if (!Ident_final) { 1540 Ident_final = &PP.getIdentifierTable().get("final"); 1541 Ident_override = &PP.getIdentifierTable().get("override"); 1542 } 1543 1544 return Tok.getIdentifierInfo() == Ident_final; 1545} 1546 1547/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1548/// 1549/// member-declaration: 1550/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1551/// function-definition ';'[opt] 1552/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1553/// using-declaration [TODO] 1554/// [C++0x] static_assert-declaration 1555/// template-declaration 1556/// [GNU] '__extension__' member-declaration 1557/// 1558/// member-declarator-list: 1559/// member-declarator 1560/// member-declarator-list ',' member-declarator 1561/// 1562/// member-declarator: 1563/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1564/// declarator constant-initializer[opt] 1565/// [C++11] declarator brace-or-equal-initializer[opt] 1566/// identifier[opt] ':' constant-expression 1567/// 1568/// virt-specifier-seq: 1569/// virt-specifier 1570/// virt-specifier-seq virt-specifier 1571/// 1572/// virt-specifier: 1573/// override 1574/// final 1575/// new 1576/// 1577/// pure-specifier: 1578/// '= 0' 1579/// 1580/// constant-initializer: 1581/// '=' constant-expression 1582/// 1583void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1584 const ParsedTemplateInfo &TemplateInfo, 1585 ParsingDeclRAIIObject *TemplateDiags) { 1586 if (Tok.is(tok::at)) { 1587 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1588 Diag(Tok, diag::err_at_defs_cxx); 1589 else 1590 Diag(Tok, diag::err_at_in_class); 1591 1592 ConsumeToken(); 1593 SkipUntil(tok::r_brace); 1594 return; 1595 } 1596 1597 // Access declarations. 1598 if (!TemplateInfo.Kind && 1599 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1600 !TryAnnotateCXXScopeToken() && 1601 Tok.is(tok::annot_cxxscope)) { 1602 bool isAccessDecl = false; 1603 if (NextToken().is(tok::identifier)) 1604 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1605 else 1606 isAccessDecl = NextToken().is(tok::kw_operator); 1607 1608 if (isAccessDecl) { 1609 // Collect the scope specifier token we annotated earlier. 1610 CXXScopeSpec SS; 1611 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1612 1613 // Try to parse an unqualified-id. 1614 UnqualifiedId Name; 1615 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1616 SkipUntil(tok::semi); 1617 return; 1618 } 1619 1620 // TODO: recover from mistakenly-qualified operator declarations. 1621 if (ExpectAndConsume(tok::semi, 1622 diag::err_expected_semi_after, 1623 "access declaration", 1624 tok::semi)) 1625 return; 1626 1627 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1628 false, SourceLocation(), 1629 SS, Name, 1630 /* AttrList */ 0, 1631 /* IsTypeName */ false, 1632 SourceLocation()); 1633 return; 1634 } 1635 } 1636 1637 // static_assert-declaration 1638 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1639 // FIXME: Check for templates 1640 SourceLocation DeclEnd; 1641 ParseStaticAssertDeclaration(DeclEnd); 1642 return; 1643 } 1644 1645 if (Tok.is(tok::kw_template)) { 1646 assert(!TemplateInfo.TemplateParams && 1647 "Nested template improperly parsed?"); 1648 SourceLocation DeclEnd; 1649 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1650 AS); 1651 return; 1652 } 1653 1654 // Handle: member-declaration ::= '__extension__' member-declaration 1655 if (Tok.is(tok::kw___extension__)) { 1656 // __extension__ silences extension warnings in the subexpression. 1657 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1658 ConsumeToken(); 1659 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1660 } 1661 1662 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1663 // is a bitfield. 1664 ColonProtectionRAIIObject X(*this); 1665 1666 ParsedAttributesWithRange attrs(AttrFactory); 1667 // Optional C++0x attribute-specifier 1668 MaybeParseCXX0XAttributes(attrs); 1669 MaybeParseMicrosoftAttributes(attrs); 1670 1671 if (Tok.is(tok::kw_using)) { 1672 ProhibitAttributes(attrs); 1673 1674 // Eat 'using'. 1675 SourceLocation UsingLoc = ConsumeToken(); 1676 1677 if (Tok.is(tok::kw_namespace)) { 1678 Diag(UsingLoc, diag::err_using_namespace_in_class); 1679 SkipUntil(tok::semi, true, true); 1680 } else { 1681 SourceLocation DeclEnd; 1682 // Otherwise, it must be a using-declaration or an alias-declaration. 1683 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1684 UsingLoc, DeclEnd, AS); 1685 } 1686 return; 1687 } 1688 1689 // decl-specifier-seq: 1690 // Parse the common declaration-specifiers piece. 1691 ParsingDeclSpec DS(*this, TemplateDiags); 1692 DS.takeAttributesFrom(attrs); 1693 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1694 1695 MultiTemplateParamsArg TemplateParams(Actions, 1696 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1697 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1698 1699 if (Tok.is(tok::semi)) { 1700 ConsumeToken(); 1701 Decl *TheDecl = 1702 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1703 DS.complete(TheDecl); 1704 return; 1705 } 1706 1707 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1708 VirtSpecifiers VS; 1709 ExprResult Init; 1710 1711 // Hold late-parsed attributes so we can attach a Decl to them later. 1712 LateParsedAttrList LateParsedAttrs; 1713 1714 if (Tok.isNot(tok::colon)) { 1715 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1716 ColonProtectionRAIIObject X(*this); 1717 1718 // Parse the first declarator. 1719 ParseDeclarator(DeclaratorInfo); 1720 // Error parsing the declarator? 1721 if (!DeclaratorInfo.hasName()) { 1722 // If so, skip until the semi-colon or a }. 1723 SkipUntil(tok::r_brace, true, true); 1724 if (Tok.is(tok::semi)) 1725 ConsumeToken(); 1726 return; 1727 } 1728 1729 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1730 1731 // If attributes exist after the declarator, but before an '{', parse them. 1732 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1733 1734 // MSVC permits pure specifier on inline functions declared at class scope. 1735 // Hence check for =0 before checking for function definition. 1736 if (getLang().MicrosoftExt && Tok.is(tok::equal) && 1737 DeclaratorInfo.isFunctionDeclarator() && 1738 NextToken().is(tok::numeric_constant)) { 1739 ConsumeToken(); 1740 Init = ParseInitializer(); 1741 if (Init.isInvalid()) 1742 SkipUntil(tok::comma, true, true); 1743 } 1744 1745 bool IsDefinition = false; 1746 // function-definition: 1747 // 1748 // In C++11, a non-function declarator followed by an open brace is a 1749 // braced-init-list for an in-class member initialization, not an 1750 // erroneous function definition. 1751 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1752 IsDefinition = true; 1753 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1754 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1755 IsDefinition = true; 1756 } else if (Tok.is(tok::equal)) { 1757 const Token &KW = NextToken(); 1758 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1759 IsDefinition = true; 1760 } 1761 } 1762 1763 if (IsDefinition) { 1764 if (!DeclaratorInfo.isFunctionDeclarator()) { 1765 Diag(Tok, diag::err_func_def_no_params); 1766 ConsumeBrace(); 1767 SkipUntil(tok::r_brace, true); 1768 1769 // Consume the optional ';' 1770 if (Tok.is(tok::semi)) 1771 ConsumeToken(); 1772 return; 1773 } 1774 1775 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1776 Diag(Tok, diag::err_function_declared_typedef); 1777 // This recovery skips the entire function body. It would be nice 1778 // to simply call ParseCXXInlineMethodDef() below, however Sema 1779 // assumes the declarator represents a function, not a typedef. 1780 ConsumeBrace(); 1781 SkipUntil(tok::r_brace, true); 1782 1783 // Consume the optional ';' 1784 if (Tok.is(tok::semi)) 1785 ConsumeToken(); 1786 return; 1787 } 1788 1789 Decl *FunDecl = 1790 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init); 1791 1792 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1793 LateParsedAttrs[i]->setDecl(FunDecl); 1794 } 1795 LateParsedAttrs.clear(); 1796 1797 // Consume the ';' - it's optional unless we have a delete or default 1798 if (Tok.is(tok::semi)) { 1799 ConsumeToken(); 1800 } 1801 1802 return; 1803 } 1804 } 1805 1806 // member-declarator-list: 1807 // member-declarator 1808 // member-declarator-list ',' member-declarator 1809 1810 SmallVector<Decl *, 8> DeclsInGroup; 1811 ExprResult BitfieldSize; 1812 1813 while (1) { 1814 // member-declarator: 1815 // declarator pure-specifier[opt] 1816 // declarator brace-or-equal-initializer[opt] 1817 // identifier[opt] ':' constant-expression 1818 if (Tok.is(tok::colon)) { 1819 ConsumeToken(); 1820 BitfieldSize = ParseConstantExpression(); 1821 if (BitfieldSize.isInvalid()) 1822 SkipUntil(tok::comma, true, true); 1823 } 1824 1825 // If a simple-asm-expr is present, parse it. 1826 if (Tok.is(tok::kw_asm)) { 1827 SourceLocation Loc; 1828 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1829 if (AsmLabel.isInvalid()) 1830 SkipUntil(tok::comma, true, true); 1831 1832 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1833 DeclaratorInfo.SetRangeEnd(Loc); 1834 } 1835 1836 // If attributes exist after the declarator, parse them. 1837 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1838 1839 // FIXME: When g++ adds support for this, we'll need to check whether it 1840 // goes before or after the GNU attributes and __asm__. 1841 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1842 1843 bool HasDeferredInitializer = false; 1844 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) { 1845 if (BitfieldSize.get()) { 1846 Diag(Tok, diag::err_bitfield_member_init); 1847 SkipUntil(tok::comma, true, true); 1848 } else { 1849 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1850 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1851 != DeclSpec::SCS_static && 1852 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1853 != DeclSpec::SCS_typedef; 1854 1855 if (!HasDeferredInitializer) { 1856 SourceLocation EqualLoc; 1857 Init = ParseCXXMemberInitializer( 1858 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 1859 if (Init.isInvalid()) 1860 SkipUntil(tok::comma, true, true); 1861 } 1862 } 1863 } 1864 1865 // NOTE: If Sema is the Action module and declarator is an instance field, 1866 // this call will *not* return the created decl; It will return null. 1867 // See Sema::ActOnCXXMemberDeclarator for details. 1868 1869 Decl *ThisDecl = 0; 1870 if (DS.isFriendSpecified()) { 1871 // TODO: handle initializers, bitfields, 'delete' 1872 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1873 /*IsDefinition*/ false, 1874 move(TemplateParams)); 1875 } else { 1876 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1877 DeclaratorInfo, 1878 move(TemplateParams), 1879 BitfieldSize.release(), 1880 VS, Init.release(), 1881 HasDeferredInitializer, 1882 /*IsDefinition*/ false); 1883 } 1884 if (ThisDecl) 1885 DeclsInGroup.push_back(ThisDecl); 1886 1887 if (DeclaratorInfo.isFunctionDeclarator() && 1888 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1889 != DeclSpec::SCS_typedef) { 1890 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1891 } 1892 1893 DeclaratorInfo.complete(ThisDecl); 1894 1895 // Set the Decl for any late parsed attributes 1896 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1897 LateParsedAttrs[i]->setDecl(ThisDecl); 1898 } 1899 LateParsedAttrs.clear(); 1900 1901 if (HasDeferredInitializer) { 1902 if (!getLang().CPlusPlus0x) 1903 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension); 1904 1905 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1906 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1907 // declarator is followed by an initializer. 1908 // 1909 // A brace-or-equal-initializer for a member-declarator is not an 1910 // initializer in the gramamr, so this is ill-formed. 1911 Diag(Tok, diag::err_incomplete_array_member_init); 1912 SkipUntil(tok::comma, true, true); 1913 // Avoid later warnings about a class member of incomplete type. 1914 ThisDecl->setInvalidDecl(); 1915 } else 1916 ParseCXXNonStaticMemberInitializer(ThisDecl); 1917 } 1918 1919 // If we don't have a comma, it is either the end of the list (a ';') 1920 // or an error, bail out. 1921 if (Tok.isNot(tok::comma)) 1922 break; 1923 1924 // Consume the comma. 1925 ConsumeToken(); 1926 1927 // Parse the next declarator. 1928 DeclaratorInfo.clear(); 1929 VS.clear(); 1930 BitfieldSize = 0; 1931 Init = 0; 1932 1933 // Attributes are only allowed on the second declarator. 1934 MaybeParseGNUAttributes(DeclaratorInfo); 1935 1936 if (Tok.isNot(tok::colon)) 1937 ParseDeclarator(DeclaratorInfo); 1938 } 1939 1940 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1941 // Skip to end of block or statement. 1942 SkipUntil(tok::r_brace, true, true); 1943 // If we stopped at a ';', eat it. 1944 if (Tok.is(tok::semi)) ConsumeToken(); 1945 return; 1946 } 1947 1948 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1949 DeclsInGroup.size()); 1950} 1951 1952/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1953/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1954/// function definition. The location of the '=', if any, will be placed in 1955/// EqualLoc. 1956/// 1957/// pure-specifier: 1958/// '= 0' 1959/// 1960/// brace-or-equal-initializer: 1961/// '=' initializer-expression 1962/// braced-init-list [TODO] 1963/// 1964/// initializer-clause: 1965/// assignment-expression 1966/// braced-init-list [TODO] 1967/// 1968/// defaulted/deleted function-definition: 1969/// '=' 'default' 1970/// '=' 'delete' 1971/// 1972/// Prior to C++0x, the assignment-expression in an initializer-clause must 1973/// be a constant-expression. 1974ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1975 SourceLocation &EqualLoc) { 1976 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 1977 && "Data member initializer not starting with '=' or '{'"); 1978 1979 if (Tok.is(tok::equal)) { 1980 EqualLoc = ConsumeToken(); 1981 if (Tok.is(tok::kw_delete)) { 1982 // In principle, an initializer of '= delete p;' is legal, but it will 1983 // never type-check. It's better to diagnose it as an ill-formed expression 1984 // than as an ill-formed deleted non-function member. 1985 // An initializer of '= delete p, foo' will never be parsed, because 1986 // a top-level comma always ends the initializer expression. 1987 const Token &Next = NextToken(); 1988 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 1989 Next.is(tok::eof)) { 1990 if (IsFunction) 1991 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1992 << 1 /* delete */; 1993 else 1994 Diag(ConsumeToken(), diag::err_deleted_non_function); 1995 return ExprResult(); 1996 } 1997 } else if (Tok.is(tok::kw_default)) { 1998 if (IsFunction) 1999 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2000 << 0 /* default */; 2001 else 2002 Diag(ConsumeToken(), diag::err_default_special_members); 2003 return ExprResult(); 2004 } 2005 2006 return ParseInitializer(); 2007 } else 2008 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 2009} 2010 2011/// ParseCXXMemberSpecification - Parse the class definition. 2012/// 2013/// member-specification: 2014/// member-declaration member-specification[opt] 2015/// access-specifier ':' member-specification[opt] 2016/// 2017void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2018 unsigned TagType, Decl *TagDecl) { 2019 assert((TagType == DeclSpec::TST_struct || 2020 TagType == DeclSpec::TST_union || 2021 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2022 2023 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2024 "parsing struct/union/class body"); 2025 2026 // Determine whether this is a non-nested class. Note that local 2027 // classes are *not* considered to be nested classes. 2028 bool NonNestedClass = true; 2029 if (!ClassStack.empty()) { 2030 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2031 if (S->isClassScope()) { 2032 // We're inside a class scope, so this is a nested class. 2033 NonNestedClass = false; 2034 break; 2035 } 2036 2037 if ((S->getFlags() & Scope::FnScope)) { 2038 // If we're in a function or function template declared in the 2039 // body of a class, then this is a local class rather than a 2040 // nested class. 2041 const Scope *Parent = S->getParent(); 2042 if (Parent->isTemplateParamScope()) 2043 Parent = Parent->getParent(); 2044 if (Parent->isClassScope()) 2045 break; 2046 } 2047 } 2048 } 2049 2050 // Enter a scope for the class. 2051 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2052 2053 // Note that we are parsing a new (potentially-nested) class definition. 2054 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2055 2056 if (TagDecl) 2057 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2058 2059 SourceLocation FinalLoc; 2060 2061 // Parse the optional 'final' keyword. 2062 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2063 IdentifierInfo *II = Tok.getIdentifierInfo(); 2064 2065 // Initialize the contextual keywords. 2066 if (!Ident_final) { 2067 Ident_final = &PP.getIdentifierTable().get("final"); 2068 Ident_override = &PP.getIdentifierTable().get("override"); 2069 } 2070 2071 if (II == Ident_final) 2072 FinalLoc = ConsumeToken(); 2073 2074 if (!getLang().CPlusPlus0x) 2075 Diag(FinalLoc, diag::ext_override_control_keyword) << "final"; 2076 } 2077 2078 if (Tok.is(tok::colon)) { 2079 ParseBaseClause(TagDecl); 2080 2081 if (!Tok.is(tok::l_brace)) { 2082 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2083 2084 if (TagDecl) 2085 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2086 return; 2087 } 2088 } 2089 2090 assert(Tok.is(tok::l_brace)); 2091 2092 SourceLocation LBraceLoc = ConsumeBrace(); 2093 2094 if (TagDecl) 2095 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2096 LBraceLoc); 2097 2098 // C++ 11p3: Members of a class defined with the keyword class are private 2099 // by default. Members of a class defined with the keywords struct or union 2100 // are public by default. 2101 AccessSpecifier CurAS; 2102 if (TagType == DeclSpec::TST_class) 2103 CurAS = AS_private; 2104 else 2105 CurAS = AS_public; 2106 2107 SourceLocation RBraceLoc; 2108 if (TagDecl) { 2109 // While we still have something to read, read the member-declarations. 2110 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2111 // Each iteration of this loop reads one member-declaration. 2112 2113 if (getLang().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2114 Tok.is(tok::kw___if_not_exists))) { 2115 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2116 continue; 2117 } 2118 2119 // Check for extraneous top-level semicolon. 2120 if (Tok.is(tok::semi)) { 2121 Diag(Tok, diag::ext_extra_struct_semi) 2122 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2123 << FixItHint::CreateRemoval(Tok.getLocation()); 2124 ConsumeToken(); 2125 continue; 2126 } 2127 2128 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2129 if (AS != AS_none) { 2130 // Current token is a C++ access specifier. 2131 CurAS = AS; 2132 SourceLocation ASLoc = Tok.getLocation(); 2133 ConsumeToken(); 2134 if (Tok.is(tok::colon)) 2135 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2136 else 2137 Diag(Tok, diag::err_expected_colon); 2138 ConsumeToken(); 2139 continue; 2140 } 2141 2142 // FIXME: Make sure we don't have a template here. 2143 2144 // Parse all the comma separated declarators. 2145 ParseCXXClassMemberDeclaration(CurAS); 2146 } 2147 2148 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 2149 } else { 2150 SkipUntil(tok::r_brace, false, false); 2151 } 2152 2153 // If attributes exist after class contents, parse them. 2154 ParsedAttributes attrs(AttrFactory); 2155 MaybeParseGNUAttributes(attrs); 2156 2157 if (TagDecl) 2158 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2159 LBraceLoc, RBraceLoc, 2160 attrs.getList()); 2161 2162 // C++0x [class.mem]p2: Within the class member-specification, the class is 2163 // regarded as complete within function bodies, default arguments, exception- 2164 // specifications, and brace-or-equal-initializers for non-static data 2165 // members (including such things in nested classes). 2166 // 2167 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2168 // handled. Fix the others! 2169 if (TagDecl && NonNestedClass) { 2170 // We are not inside a nested class. This class and its nested classes 2171 // are complete and we can parse the delayed portions of method 2172 // declarations and the lexed inline method definitions, along with any 2173 // delayed attributes. 2174 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2175 ParseLexedAttributes(getCurrentClass()); 2176 ParseLexedMethodDeclarations(getCurrentClass()); 2177 ParseLexedMemberInitializers(getCurrentClass()); 2178 ParseLexedMethodDefs(getCurrentClass()); 2179 PrevTokLocation = SavedPrevTokLocation; 2180 } 2181 2182 if (TagDecl) 2183 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 2184 2185 // Leave the class scope. 2186 ParsingDef.Pop(); 2187 ClassScope.Exit(); 2188} 2189 2190/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2191/// which explicitly initializes the members or base classes of a 2192/// class (C++ [class.base.init]). For example, the three initializers 2193/// after the ':' in the Derived constructor below: 2194/// 2195/// @code 2196/// class Base { }; 2197/// class Derived : Base { 2198/// int x; 2199/// float f; 2200/// public: 2201/// Derived(float f) : Base(), x(17), f(f) { } 2202/// }; 2203/// @endcode 2204/// 2205/// [C++] ctor-initializer: 2206/// ':' mem-initializer-list 2207/// 2208/// [C++] mem-initializer-list: 2209/// mem-initializer ...[opt] 2210/// mem-initializer ...[opt] , mem-initializer-list 2211void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2212 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2213 2214 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2215 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2216 SourceLocation ColonLoc = ConsumeToken(); 2217 2218 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2219 bool AnyErrors = false; 2220 2221 do { 2222 if (Tok.is(tok::code_completion)) { 2223 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2224 MemInitializers.data(), 2225 MemInitializers.size()); 2226 return cutOffParsing(); 2227 } else { 2228 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2229 if (!MemInit.isInvalid()) 2230 MemInitializers.push_back(MemInit.get()); 2231 else 2232 AnyErrors = true; 2233 } 2234 2235 if (Tok.is(tok::comma)) 2236 ConsumeToken(); 2237 else if (Tok.is(tok::l_brace)) 2238 break; 2239 // If the next token looks like a base or member initializer, assume that 2240 // we're just missing a comma. 2241 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2242 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2243 Diag(Loc, diag::err_ctor_init_missing_comma) 2244 << FixItHint::CreateInsertion(Loc, ", "); 2245 } else { 2246 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2247 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2248 SkipUntil(tok::l_brace, true, true); 2249 break; 2250 } 2251 } while (true); 2252 2253 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2254 MemInitializers.data(), MemInitializers.size(), 2255 AnyErrors); 2256} 2257 2258/// ParseMemInitializer - Parse a C++ member initializer, which is 2259/// part of a constructor initializer that explicitly initializes one 2260/// member or base class (C++ [class.base.init]). See 2261/// ParseConstructorInitializer for an example. 2262/// 2263/// [C++] mem-initializer: 2264/// mem-initializer-id '(' expression-list[opt] ')' 2265/// [C++0x] mem-initializer-id braced-init-list 2266/// 2267/// [C++] mem-initializer-id: 2268/// '::'[opt] nested-name-specifier[opt] class-name 2269/// identifier 2270Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2271 // parse '::'[opt] nested-name-specifier[opt] 2272 CXXScopeSpec SS; 2273 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2274 ParsedType TemplateTypeTy; 2275 if (Tok.is(tok::annot_template_id)) { 2276 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2277 if (TemplateId->Kind == TNK_Type_template || 2278 TemplateId->Kind == TNK_Dependent_template_name) { 2279 AnnotateTemplateIdTokenAsType(); 2280 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2281 TemplateTypeTy = getTypeAnnotation(Tok); 2282 } 2283 } 2284 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2285 Diag(Tok, diag::err_expected_member_or_base_name); 2286 return true; 2287 } 2288 2289 // Get the identifier. This may be a member name or a class name, 2290 // but we'll let the semantic analysis determine which it is. 2291 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2292 SourceLocation IdLoc = ConsumeToken(); 2293 2294 // Parse the '('. 2295 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2296 // FIXME: Do something with the braced-init-list. 2297 ParseBraceInitializer(); 2298 return true; 2299 } else if(Tok.is(tok::l_paren)) { 2300 SourceLocation LParenLoc = ConsumeParen(); 2301 2302 // Parse the optional expression-list. 2303 ExprVector ArgExprs(Actions); 2304 CommaLocsTy CommaLocs; 2305 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2306 SkipUntil(tok::r_paren); 2307 return true; 2308 } 2309 2310 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2311 2312 SourceLocation EllipsisLoc; 2313 if (Tok.is(tok::ellipsis)) 2314 EllipsisLoc = ConsumeToken(); 2315 2316 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2317 TemplateTypeTy, IdLoc, 2318 LParenLoc, ArgExprs.take(), 2319 ArgExprs.size(), RParenLoc, 2320 EllipsisLoc); 2321 } 2322 2323 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2324 : diag::err_expected_lparen); 2325 return true; 2326} 2327 2328/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2329/// 2330/// exception-specification: 2331/// dynamic-exception-specification 2332/// noexcept-specification 2333/// 2334/// noexcept-specification: 2335/// 'noexcept' 2336/// 'noexcept' '(' constant-expression ')' 2337ExceptionSpecificationType 2338Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2339 SmallVectorImpl<ParsedType> &DynamicExceptions, 2340 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2341 ExprResult &NoexceptExpr) { 2342 ExceptionSpecificationType Result = EST_None; 2343 2344 // See if there's a dynamic specification. 2345 if (Tok.is(tok::kw_throw)) { 2346 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2347 DynamicExceptions, 2348 DynamicExceptionRanges); 2349 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2350 "Produced different number of exception types and ranges."); 2351 } 2352 2353 // If there's no noexcept specification, we're done. 2354 if (Tok.isNot(tok::kw_noexcept)) 2355 return Result; 2356 2357 // If we already had a dynamic specification, parse the noexcept for, 2358 // recovery, but emit a diagnostic and don't store the results. 2359 SourceRange NoexceptRange; 2360 ExceptionSpecificationType NoexceptType = EST_None; 2361 2362 SourceLocation KeywordLoc = ConsumeToken(); 2363 if (Tok.is(tok::l_paren)) { 2364 // There is an argument. 2365 SourceLocation LParenLoc = ConsumeParen(); 2366 NoexceptType = EST_ComputedNoexcept; 2367 NoexceptExpr = ParseConstantExpression(); 2368 // The argument must be contextually convertible to bool. We use 2369 // ActOnBooleanCondition for this purpose. 2370 if (!NoexceptExpr.isInvalid()) 2371 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2372 NoexceptExpr.get()); 2373 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2374 NoexceptRange = SourceRange(KeywordLoc, RParenLoc); 2375 } else { 2376 // There is no argument. 2377 NoexceptType = EST_BasicNoexcept; 2378 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2379 } 2380 2381 if (Result == EST_None) { 2382 SpecificationRange = NoexceptRange; 2383 Result = NoexceptType; 2384 2385 // If there's a dynamic specification after a noexcept specification, 2386 // parse that and ignore the results. 2387 if (Tok.is(tok::kw_throw)) { 2388 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2389 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2390 DynamicExceptionRanges); 2391 } 2392 } else { 2393 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2394 } 2395 2396 return Result; 2397} 2398 2399/// ParseDynamicExceptionSpecification - Parse a C++ 2400/// dynamic-exception-specification (C++ [except.spec]). 2401/// 2402/// dynamic-exception-specification: 2403/// 'throw' '(' type-id-list [opt] ')' 2404/// [MS] 'throw' '(' '...' ')' 2405/// 2406/// type-id-list: 2407/// type-id ... [opt] 2408/// type-id-list ',' type-id ... [opt] 2409/// 2410ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2411 SourceRange &SpecificationRange, 2412 SmallVectorImpl<ParsedType> &Exceptions, 2413 SmallVectorImpl<SourceRange> &Ranges) { 2414 assert(Tok.is(tok::kw_throw) && "expected throw"); 2415 2416 SpecificationRange.setBegin(ConsumeToken()); 2417 2418 if (!Tok.is(tok::l_paren)) { 2419 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2420 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2421 return EST_DynamicNone; 2422 } 2423 SourceLocation LParenLoc = ConsumeParen(); 2424 2425 // Parse throw(...), a Microsoft extension that means "this function 2426 // can throw anything". 2427 if (Tok.is(tok::ellipsis)) { 2428 SourceLocation EllipsisLoc = ConsumeToken(); 2429 if (!getLang().MicrosoftExt) 2430 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2431 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2432 SpecificationRange.setEnd(RParenLoc); 2433 return EST_MSAny; 2434 } 2435 2436 // Parse the sequence of type-ids. 2437 SourceRange Range; 2438 while (Tok.isNot(tok::r_paren)) { 2439 TypeResult Res(ParseTypeName(&Range)); 2440 2441 if (Tok.is(tok::ellipsis)) { 2442 // C++0x [temp.variadic]p5: 2443 // - In a dynamic-exception-specification (15.4); the pattern is a 2444 // type-id. 2445 SourceLocation Ellipsis = ConsumeToken(); 2446 Range.setEnd(Ellipsis); 2447 if (!Res.isInvalid()) 2448 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2449 } 2450 2451 if (!Res.isInvalid()) { 2452 Exceptions.push_back(Res.get()); 2453 Ranges.push_back(Range); 2454 } 2455 2456 if (Tok.is(tok::comma)) 2457 ConsumeToken(); 2458 else 2459 break; 2460 } 2461 2462 SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc)); 2463 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2464} 2465 2466/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2467/// function declaration. 2468TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2469 assert(Tok.is(tok::arrow) && "expected arrow"); 2470 2471 ConsumeToken(); 2472 2473 // FIXME: Need to suppress declarations when parsing this typename. 2474 // Otherwise in this function definition: 2475 // 2476 // auto f() -> struct X {} 2477 // 2478 // struct X is parsed as class definition because of the trailing 2479 // brace. 2480 return ParseTypeName(&Range); 2481} 2482 2483/// \brief We have just started parsing the definition of a new class, 2484/// so push that class onto our stack of classes that is currently 2485/// being parsed. 2486Sema::ParsingClassState 2487Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2488 assert((NonNestedClass || !ClassStack.empty()) && 2489 "Nested class without outer class"); 2490 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2491 return Actions.PushParsingClass(); 2492} 2493 2494/// \brief Deallocate the given parsed class and all of its nested 2495/// classes. 2496void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2497 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2498 delete Class->LateParsedDeclarations[I]; 2499 delete Class; 2500} 2501 2502/// \brief Pop the top class of the stack of classes that are 2503/// currently being parsed. 2504/// 2505/// This routine should be called when we have finished parsing the 2506/// definition of a class, but have not yet popped the Scope 2507/// associated with the class's definition. 2508/// 2509/// \returns true if the class we've popped is a top-level class, 2510/// false otherwise. 2511void Parser::PopParsingClass(Sema::ParsingClassState state) { 2512 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2513 2514 Actions.PopParsingClass(state); 2515 2516 ParsingClass *Victim = ClassStack.top(); 2517 ClassStack.pop(); 2518 if (Victim->TopLevelClass) { 2519 // Deallocate all of the nested classes of this class, 2520 // recursively: we don't need to keep any of this information. 2521 DeallocateParsedClasses(Victim); 2522 return; 2523 } 2524 assert(!ClassStack.empty() && "Missing top-level class?"); 2525 2526 if (Victim->LateParsedDeclarations.empty()) { 2527 // The victim is a nested class, but we will not need to perform 2528 // any processing after the definition of this class since it has 2529 // no members whose handling was delayed. Therefore, we can just 2530 // remove this nested class. 2531 DeallocateParsedClasses(Victim); 2532 return; 2533 } 2534 2535 // This nested class has some members that will need to be processed 2536 // after the top-level class is completely defined. Therefore, add 2537 // it to the list of nested classes within its parent. 2538 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2539 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2540 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2541} 2542 2543/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2544/// parses standard attributes. 2545/// 2546/// [C++0x] attribute-specifier: 2547/// '[' '[' attribute-list ']' ']' 2548/// 2549/// [C++0x] attribute-list: 2550/// attribute[opt] 2551/// attribute-list ',' attribute[opt] 2552/// 2553/// [C++0x] attribute: 2554/// attribute-token attribute-argument-clause[opt] 2555/// 2556/// [C++0x] attribute-token: 2557/// identifier 2558/// attribute-scoped-token 2559/// 2560/// [C++0x] attribute-scoped-token: 2561/// attribute-namespace '::' identifier 2562/// 2563/// [C++0x] attribute-namespace: 2564/// identifier 2565/// 2566/// [C++0x] attribute-argument-clause: 2567/// '(' balanced-token-seq ')' 2568/// 2569/// [C++0x] balanced-token-seq: 2570/// balanced-token 2571/// balanced-token-seq balanced-token 2572/// 2573/// [C++0x] balanced-token: 2574/// '(' balanced-token-seq ')' 2575/// '[' balanced-token-seq ']' 2576/// '{' balanced-token-seq '}' 2577/// any token but '(', ')', '[', ']', '{', or '}' 2578void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2579 SourceLocation *endLoc) { 2580 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2581 && "Not a C++0x attribute list"); 2582 2583 SourceLocation StartLoc = Tok.getLocation(), Loc; 2584 2585 ConsumeBracket(); 2586 ConsumeBracket(); 2587 2588 if (Tok.is(tok::comma)) { 2589 Diag(Tok.getLocation(), diag::err_expected_ident); 2590 ConsumeToken(); 2591 } 2592 2593 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2594 // attribute not present 2595 if (Tok.is(tok::comma)) { 2596 ConsumeToken(); 2597 continue; 2598 } 2599 2600 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2601 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2602 2603 // scoped attribute 2604 if (Tok.is(tok::coloncolon)) { 2605 ConsumeToken(); 2606 2607 if (!Tok.is(tok::identifier)) { 2608 Diag(Tok.getLocation(), diag::err_expected_ident); 2609 SkipUntil(tok::r_square, tok::comma, true, true); 2610 continue; 2611 } 2612 2613 ScopeName = AttrName; 2614 ScopeLoc = AttrLoc; 2615 2616 AttrName = Tok.getIdentifierInfo(); 2617 AttrLoc = ConsumeToken(); 2618 } 2619 2620 bool AttrParsed = false; 2621 // No scoped names are supported; ideally we could put all non-standard 2622 // attributes into namespaces. 2623 if (!ScopeName) { 2624 switch(AttributeList::getKind(AttrName)) 2625 { 2626 // No arguments 2627 case AttributeList::AT_carries_dependency: 2628 case AttributeList::AT_noreturn: { 2629 if (Tok.is(tok::l_paren)) { 2630 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2631 << AttrName->getName(); 2632 break; 2633 } 2634 2635 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2636 SourceLocation(), 0, 0, false, true); 2637 AttrParsed = true; 2638 break; 2639 } 2640 2641 // One argument; must be a type-id or assignment-expression 2642 case AttributeList::AT_aligned: { 2643 if (Tok.isNot(tok::l_paren)) { 2644 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2645 << AttrName->getName(); 2646 break; 2647 } 2648 SourceLocation ParamLoc = ConsumeParen(); 2649 2650 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2651 2652 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2653 2654 ExprVector ArgExprs(Actions); 2655 ArgExprs.push_back(ArgExpr.release()); 2656 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 2657 0, ParamLoc, ArgExprs.take(), 1, 2658 false, true); 2659 2660 AttrParsed = true; 2661 break; 2662 } 2663 2664 // Silence warnings 2665 default: break; 2666 } 2667 } 2668 2669 // Skip the entire parameter clause, if any 2670 if (!AttrParsed && Tok.is(tok::l_paren)) { 2671 ConsumeParen(); 2672 // SkipUntil maintains the balancedness of tokens. 2673 SkipUntil(tok::r_paren, false); 2674 } 2675 } 2676 2677 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2678 SkipUntil(tok::r_square, false); 2679 Loc = Tok.getLocation(); 2680 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2681 SkipUntil(tok::r_square, false); 2682 2683 attrs.Range = SourceRange(StartLoc, Loc); 2684} 2685 2686/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2687/// attribute. 2688/// 2689/// FIXME: Simply returns an alignof() expression if the argument is a 2690/// type. Ideally, the type should be propagated directly into Sema. 2691/// 2692/// [C++0x] 'align' '(' type-id ')' 2693/// [C++0x] 'align' '(' assignment-expression ')' 2694ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2695 if (isTypeIdInParens()) { 2696 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2697 SourceLocation TypeLoc = Tok.getLocation(); 2698 ParsedType Ty = ParseTypeName().get(); 2699 SourceRange TypeRange(Start, Tok.getLocation()); 2700 return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true, 2701 Ty.getAsOpaquePtr(), TypeRange); 2702 } else 2703 return ParseConstantExpression(); 2704} 2705 2706/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2707/// 2708/// [MS] ms-attribute: 2709/// '[' token-seq ']' 2710/// 2711/// [MS] ms-attribute-seq: 2712/// ms-attribute[opt] 2713/// ms-attribute ms-attribute-seq 2714void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2715 SourceLocation *endLoc) { 2716 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2717 2718 while (Tok.is(tok::l_square)) { 2719 ConsumeBracket(); 2720 SkipUntil(tok::r_square, true, true); 2721 if (endLoc) *endLoc = Tok.getLocation(); 2722 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2723 } 2724} 2725 2726void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2727 AccessSpecifier& CurAS) { 2728 bool Result; 2729 if (ParseMicrosoftIfExistsCondition(Result)) 2730 return; 2731 2732 if (Tok.isNot(tok::l_brace)) { 2733 Diag(Tok, diag::err_expected_lbrace); 2734 return; 2735 } 2736 ConsumeBrace(); 2737 2738 // Condition is false skip all inside the {}. 2739 if (!Result) { 2740 SkipUntil(tok::r_brace, false); 2741 return; 2742 } 2743 2744 // Condition is true, parse the declaration. 2745 while (Tok.isNot(tok::r_brace)) { 2746 2747 // __if_exists, __if_not_exists can nest. 2748 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2749 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2750 continue; 2751 } 2752 2753 // Check for extraneous top-level semicolon. 2754 if (Tok.is(tok::semi)) { 2755 Diag(Tok, diag::ext_extra_struct_semi) 2756 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2757 << FixItHint::CreateRemoval(Tok.getLocation()); 2758 ConsumeToken(); 2759 continue; 2760 } 2761 2762 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2763 if (AS != AS_none) { 2764 // Current token is a C++ access specifier. 2765 CurAS = AS; 2766 SourceLocation ASLoc = Tok.getLocation(); 2767 ConsumeToken(); 2768 if (Tok.is(tok::colon)) 2769 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2770 else 2771 Diag(Tok, diag::err_expected_colon); 2772 ConsumeToken(); 2773 continue; 2774 } 2775 2776 // Parse all the comma separated declarators. 2777 ParseCXXClassMemberDeclaration(CurAS); 2778 } 2779 2780 if (Tok.isNot(tok::r_brace)) { 2781 Diag(Tok, diag::err_expected_rbrace); 2782 return; 2783 } 2784 ConsumeBrace(); 2785} 2786