ParseDeclCXX.cpp revision 25a767651d14db87aa03dd5fe3e011d877dd4100
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 56 if (Tok.is(tok::code_completion)) { 57 Actions.CodeCompleteNamespaceDecl(getCurScope()); 58 ConsumeCodeCompletionToken(); 59 } 60 61 SourceLocation IdentLoc; 62 IdentifierInfo *Ident = 0; 63 std::vector<SourceLocation> ExtraIdentLoc; 64 std::vector<IdentifierInfo*> ExtraIdent; 65 std::vector<SourceLocation> ExtraNamespaceLoc; 66 67 Token attrTok; 68 69 if (Tok.is(tok::identifier)) { 70 Ident = Tok.getIdentifierInfo(); 71 IdentLoc = ConsumeToken(); // eat the identifier. 72 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { 73 ExtraNamespaceLoc.push_back(ConsumeToken()); 74 ExtraIdent.push_back(Tok.getIdentifierInfo()); 75 ExtraIdentLoc.push_back(ConsumeToken()); 76 } 77 } 78 79 // Read label attributes, if present. 80 ParsedAttributes attrs(AttrFactory); 81 if (Tok.is(tok::kw___attribute)) { 82 attrTok = Tok; 83 ParseGNUAttributes(attrs); 84 } 85 86 if (Tok.is(tok::equal)) { 87 if (!attrs.empty()) 88 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 89 if (InlineLoc.isValid()) 90 Diag(InlineLoc, diag::err_inline_namespace_alias) 91 << FixItHint::CreateRemoval(InlineLoc); 92 93 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 94 } 95 96 97 if (Tok.isNot(tok::l_brace)) { 98 if (!ExtraIdent.empty()) { 99 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 100 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 101 } 102 Diag(Tok, Ident ? diag::err_expected_lbrace : 103 diag::err_expected_ident_lbrace); 104 return 0; 105 } 106 107 SourceLocation LBrace = ConsumeBrace(); 108 109 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 110 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 111 getCurScope()->getFnParent()) { 112 if (!ExtraIdent.empty()) { 113 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 114 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 115 } 116 Diag(LBrace, diag::err_namespace_nonnamespace_scope); 117 SkipUntil(tok::r_brace, false); 118 return 0; 119 } 120 121 if (!ExtraIdent.empty()) { 122 TentativeParsingAction TPA(*this); 123 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 124 Token rBraceToken = Tok; 125 TPA.Revert(); 126 127 if (!rBraceToken.is(tok::r_brace)) { 128 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 129 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 130 } else { 131 std::string NamespaceFix; 132 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 133 E = ExtraIdent.end(); I != E; ++I) { 134 NamespaceFix += " { namespace "; 135 NamespaceFix += (*I)->getName(); 136 } 137 138 std::string RBraces; 139 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 140 RBraces += "} "; 141 142 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 143 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 144 ExtraIdentLoc.back()), 145 NamespaceFix) 146 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 147 } 148 } 149 150 // If we're still good, complain about inline namespaces in non-C++0x now. 151 if (!getLang().CPlusPlus0x && InlineLoc.isValid()) 152 Diag(InlineLoc, diag::ext_inline_namespace); 153 154 // Enter a scope for the namespace. 155 ParseScope NamespaceScope(this, Scope::DeclScope); 156 157 Decl *NamespcDecl = 158 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, 159 IdentLoc, Ident, LBrace, attrs.getList()); 160 161 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 162 "parsing namespace"); 163 164 SourceLocation RBraceLoc; 165 // Parse the contents of the namespace. This includes parsing recovery on 166 // any improperly nested namespaces. 167 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 168 InlineLoc, LBrace, attrs, RBraceLoc); 169 170 // Leave the namespace scope. 171 NamespaceScope.Exit(); 172 173 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 174 175 DeclEnd = RBraceLoc; 176 return NamespcDecl; 177} 178 179/// ParseInnerNamespace - Parse the contents of a namespace. 180void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc, 181 std::vector<IdentifierInfo*>& Ident, 182 std::vector<SourceLocation>& NamespaceLoc, 183 unsigned int index, SourceLocation& InlineLoc, 184 SourceLocation& LBrace, 185 ParsedAttributes& attrs, 186 SourceLocation& RBraceLoc) { 187 if (index == Ident.size()) { 188 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 189 ParsedAttributesWithRange attrs(AttrFactory); 190 MaybeParseCXX0XAttributes(attrs); 191 MaybeParseMicrosoftAttributes(attrs); 192 ParseExternalDeclaration(attrs); 193 } 194 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 195 196 return; 197 } 198 199 // Parse improperly nested namespaces. 200 ParseScope NamespaceScope(this, Scope::DeclScope); 201 Decl *NamespcDecl = 202 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 203 NamespaceLoc[index], IdentLoc[index], 204 Ident[index], LBrace, attrs.getList()); 205 206 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 207 LBrace, attrs, RBraceLoc); 208 209 NamespaceScope.Exit(); 210 211 Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 212} 213 214/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 215/// alias definition. 216/// 217Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 218 SourceLocation AliasLoc, 219 IdentifierInfo *Alias, 220 SourceLocation &DeclEnd) { 221 assert(Tok.is(tok::equal) && "Not equal token"); 222 223 ConsumeToken(); // eat the '='. 224 225 if (Tok.is(tok::code_completion)) { 226 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 227 ConsumeCodeCompletionToken(); 228 } 229 230 CXXScopeSpec SS; 231 // Parse (optional) nested-name-specifier. 232 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 233 234 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 235 Diag(Tok, diag::err_expected_namespace_name); 236 // Skip to end of the definition and eat the ';'. 237 SkipUntil(tok::semi); 238 return 0; 239 } 240 241 // Parse identifier. 242 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 243 SourceLocation IdentLoc = ConsumeToken(); 244 245 // Eat the ';'. 246 DeclEnd = Tok.getLocation(); 247 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 248 "", tok::semi); 249 250 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 251 SS, IdentLoc, Ident); 252} 253 254/// ParseLinkage - We know that the current token is a string_literal 255/// and just before that, that extern was seen. 256/// 257/// linkage-specification: [C++ 7.5p2: dcl.link] 258/// 'extern' string-literal '{' declaration-seq[opt] '}' 259/// 'extern' string-literal declaration 260/// 261Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 262 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 263 llvm::SmallString<8> LangBuffer; 264 bool Invalid = false; 265 llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 266 if (Invalid) 267 return 0; 268 269 SourceLocation Loc = ConsumeStringToken(); 270 271 ParseScope LinkageScope(this, Scope::DeclScope); 272 Decl *LinkageSpec 273 = Actions.ActOnStartLinkageSpecification(getCurScope(), 274 DS.getSourceRange().getBegin(), 275 Loc, Lang, 276 Tok.is(tok::l_brace) ? Tok.getLocation() 277 : SourceLocation()); 278 279 ParsedAttributesWithRange attrs(AttrFactory); 280 MaybeParseCXX0XAttributes(attrs); 281 MaybeParseMicrosoftAttributes(attrs); 282 283 if (Tok.isNot(tok::l_brace)) { 284 // Reset the source range in DS, as the leading "extern" 285 // does not really belong to the inner declaration ... 286 DS.SetRangeStart(SourceLocation()); 287 DS.SetRangeEnd(SourceLocation()); 288 // ... but anyway remember that such an "extern" was seen. 289 DS.setExternInLinkageSpec(true); 290 ParseExternalDeclaration(attrs, &DS); 291 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 292 SourceLocation()); 293 } 294 295 DS.abort(); 296 297 ProhibitAttributes(attrs); 298 299 SourceLocation LBrace = ConsumeBrace(); 300 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 301 ParsedAttributesWithRange attrs(AttrFactory); 302 MaybeParseCXX0XAttributes(attrs); 303 MaybeParseMicrosoftAttributes(attrs); 304 ParseExternalDeclaration(attrs); 305 } 306 307 SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 308 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 309 RBrace); 310} 311 312/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 313/// using-directive. Assumes that current token is 'using'. 314Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 315 const ParsedTemplateInfo &TemplateInfo, 316 SourceLocation &DeclEnd, 317 ParsedAttributesWithRange &attrs) { 318 assert(Tok.is(tok::kw_using) && "Not using token"); 319 320 // Eat 'using'. 321 SourceLocation UsingLoc = ConsumeToken(); 322 323 if (Tok.is(tok::code_completion)) { 324 Actions.CodeCompleteUsing(getCurScope()); 325 ConsumeCodeCompletionToken(); 326 } 327 328 // 'using namespace' means this is a using-directive. 329 if (Tok.is(tok::kw_namespace)) { 330 // Template parameters are always an error here. 331 if (TemplateInfo.Kind) { 332 SourceRange R = TemplateInfo.getSourceRange(); 333 Diag(UsingLoc, diag::err_templated_using_directive) 334 << R << FixItHint::CreateRemoval(R); 335 } 336 337 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 338 } 339 340 // Otherwise, it must be a using-declaration or an alias-declaration. 341 342 // Using declarations can't have attributes. 343 ProhibitAttributes(attrs); 344 345 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd); 346} 347 348/// ParseUsingDirective - Parse C++ using-directive, assumes 349/// that current token is 'namespace' and 'using' was already parsed. 350/// 351/// using-directive: [C++ 7.3.p4: namespace.udir] 352/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 353/// namespace-name ; 354/// [GNU] using-directive: 355/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 356/// namespace-name attributes[opt] ; 357/// 358Decl *Parser::ParseUsingDirective(unsigned Context, 359 SourceLocation UsingLoc, 360 SourceLocation &DeclEnd, 361 ParsedAttributes &attrs) { 362 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 363 364 // Eat 'namespace'. 365 SourceLocation NamespcLoc = ConsumeToken(); 366 367 if (Tok.is(tok::code_completion)) { 368 Actions.CodeCompleteUsingDirective(getCurScope()); 369 ConsumeCodeCompletionToken(); 370 } 371 372 CXXScopeSpec SS; 373 // Parse (optional) nested-name-specifier. 374 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 375 376 IdentifierInfo *NamespcName = 0; 377 SourceLocation IdentLoc = SourceLocation(); 378 379 // Parse namespace-name. 380 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 381 Diag(Tok, diag::err_expected_namespace_name); 382 // If there was invalid namespace name, skip to end of decl, and eat ';'. 383 SkipUntil(tok::semi); 384 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 385 return 0; 386 } 387 388 // Parse identifier. 389 NamespcName = Tok.getIdentifierInfo(); 390 IdentLoc = ConsumeToken(); 391 392 // Parse (optional) attributes (most likely GNU strong-using extension). 393 bool GNUAttr = false; 394 if (Tok.is(tok::kw___attribute)) { 395 GNUAttr = true; 396 ParseGNUAttributes(attrs); 397 } 398 399 // Eat ';'. 400 DeclEnd = Tok.getLocation(); 401 ExpectAndConsume(tok::semi, 402 GNUAttr ? diag::err_expected_semi_after_attribute_list 403 : diag::err_expected_semi_after_namespace_name, 404 "", tok::semi); 405 406 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 407 IdentLoc, NamespcName, attrs.getList()); 408} 409 410/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 411/// Assumes that 'using' was already seen. 412/// 413/// using-declaration: [C++ 7.3.p3: namespace.udecl] 414/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 415/// unqualified-id 416/// 'using' :: unqualified-id 417/// 418/// alias-declaration: C++0x [decl.typedef]p2 419/// 'using' identifier = type-id ; 420/// 421Decl *Parser::ParseUsingDeclaration(unsigned Context, 422 const ParsedTemplateInfo &TemplateInfo, 423 SourceLocation UsingLoc, 424 SourceLocation &DeclEnd, 425 AccessSpecifier AS) { 426 CXXScopeSpec SS; 427 SourceLocation TypenameLoc; 428 bool IsTypeName; 429 430 // Ignore optional 'typename'. 431 // FIXME: This is wrong; we should parse this as a typename-specifier. 432 if (Tok.is(tok::kw_typename)) { 433 TypenameLoc = Tok.getLocation(); 434 ConsumeToken(); 435 IsTypeName = true; 436 } 437 else 438 IsTypeName = false; 439 440 // Parse nested-name-specifier. 441 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 442 443 // Check nested-name specifier. 444 if (SS.isInvalid()) { 445 SkipUntil(tok::semi); 446 return 0; 447 } 448 449 // Parse the unqualified-id. We allow parsing of both constructor and 450 // destructor names and allow the action module to diagnose any semantic 451 // errors. 452 UnqualifiedId Name; 453 if (ParseUnqualifiedId(SS, 454 /*EnteringContext=*/false, 455 /*AllowDestructorName=*/true, 456 /*AllowConstructorName=*/true, 457 ParsedType(), 458 Name)) { 459 SkipUntil(tok::semi); 460 return 0; 461 } 462 463 ParsedAttributes attrs(AttrFactory); 464 465 // Maybe this is an alias-declaration. 466 bool IsAliasDecl = Tok.is(tok::equal); 467 TypeResult TypeAlias; 468 if (IsAliasDecl) { 469 // TODO: Attribute support. C++0x attributes may appear before the equals. 470 // Where can GNU attributes appear? 471 ConsumeToken(); 472 473 if (!getLang().CPlusPlus0x) 474 Diag(Tok.getLocation(), diag::ext_alias_declaration); 475 476 // Type alias templates cannot be specialized. 477 int SpecKind = -1; 478 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 479 Name.getKind() == UnqualifiedId::IK_TemplateId) 480 SpecKind = 0; 481 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 482 SpecKind = 1; 483 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 484 SpecKind = 2; 485 if (SpecKind != -1) { 486 SourceRange Range; 487 if (SpecKind == 0) 488 Range = SourceRange(Name.TemplateId->LAngleLoc, 489 Name.TemplateId->RAngleLoc); 490 else 491 Range = TemplateInfo.getSourceRange(); 492 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 493 << SpecKind << Range; 494 SkipUntil(tok::semi); 495 return 0; 496 } 497 498 // Name must be an identifier. 499 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 500 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 501 // No removal fixit: can't recover from this. 502 SkipUntil(tok::semi); 503 return 0; 504 } else if (IsTypeName) 505 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 506 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 507 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 508 else if (SS.isNotEmpty()) 509 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 510 << FixItHint::CreateRemoval(SS.getRange()); 511 512 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 513 Declarator::AliasTemplateContext : 514 Declarator::AliasDeclContext); 515 } else 516 // Parse (optional) attributes (most likely GNU strong-using extension). 517 MaybeParseGNUAttributes(attrs); 518 519 // Eat ';'. 520 DeclEnd = Tok.getLocation(); 521 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 522 !attrs.empty() ? "attributes list" : 523 IsAliasDecl ? "alias declaration" : "using declaration", 524 tok::semi); 525 526 // Diagnose an attempt to declare a templated using-declaration. 527 // In C++0x, alias-declarations can be templates: 528 // template <...> using id = type; 529 if (TemplateInfo.Kind && !IsAliasDecl) { 530 SourceRange R = TemplateInfo.getSourceRange(); 531 Diag(UsingLoc, diag::err_templated_using_declaration) 532 << R << FixItHint::CreateRemoval(R); 533 534 // Unfortunately, we have to bail out instead of recovering by 535 // ignoring the parameters, just in case the nested name specifier 536 // depends on the parameters. 537 return 0; 538 } 539 540 if (IsAliasDecl) { 541 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 542 MultiTemplateParamsArg TemplateParamsArg(Actions, 543 TemplateParams ? TemplateParams->data() : 0, 544 TemplateParams ? TemplateParams->size() : 0); 545 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 546 UsingLoc, Name, TypeAlias); 547 } 548 549 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 550 Name, attrs.getList(), 551 IsTypeName, TypenameLoc); 552} 553 554/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 555/// 556/// [C++0x] static_assert-declaration: 557/// static_assert ( constant-expression , string-literal ) ; 558/// 559/// [C1X] static_assert-declaration: 560/// _Static_assert ( constant-expression , string-literal ) ; 561/// 562Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 563 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 564 "Not a static_assert declaration"); 565 566 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 567 Diag(Tok, diag::ext_c1x_static_assert); 568 569 SourceLocation StaticAssertLoc = ConsumeToken(); 570 571 if (Tok.isNot(tok::l_paren)) { 572 Diag(Tok, diag::err_expected_lparen); 573 return 0; 574 } 575 576 SourceLocation LParenLoc = ConsumeParen(); 577 578 ExprResult AssertExpr(ParseConstantExpression()); 579 if (AssertExpr.isInvalid()) { 580 SkipUntil(tok::semi); 581 return 0; 582 } 583 584 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 585 return 0; 586 587 if (Tok.isNot(tok::string_literal)) { 588 Diag(Tok, diag::err_expected_string_literal); 589 SkipUntil(tok::semi); 590 return 0; 591 } 592 593 ExprResult AssertMessage(ParseStringLiteralExpression()); 594 if (AssertMessage.isInvalid()) 595 return 0; 596 597 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 598 599 DeclEnd = Tok.getLocation(); 600 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 601 602 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 603 AssertExpr.take(), 604 AssertMessage.take(), 605 RParenLoc); 606} 607 608/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 609/// 610/// 'decltype' ( expression ) 611/// 612void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 613 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 614 615 SourceLocation StartLoc = ConsumeToken(); 616 SourceLocation LParenLoc = Tok.getLocation(); 617 618 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 619 "decltype")) { 620 SkipUntil(tok::r_paren); 621 return; 622 } 623 624 // Parse the expression 625 626 // C++0x [dcl.type.simple]p4: 627 // The operand of the decltype specifier is an unevaluated operand. 628 EnterExpressionEvaluationContext Unevaluated(Actions, 629 Sema::Unevaluated); 630 ExprResult Result = ParseExpression(); 631 if (Result.isInvalid()) { 632 SkipUntil(tok::r_paren); 633 return; 634 } 635 636 // Match the ')' 637 SourceLocation RParenLoc; 638 if (Tok.is(tok::r_paren)) 639 RParenLoc = ConsumeParen(); 640 else 641 MatchRHSPunctuation(tok::r_paren, LParenLoc); 642 643 if (RParenLoc.isInvalid()) 644 return; 645 646 const char *PrevSpec = 0; 647 unsigned DiagID; 648 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 649 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 650 DiagID, Result.release())) 651 Diag(StartLoc, DiagID) << PrevSpec; 652} 653 654void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 655 assert(Tok.is(tok::kw___underlying_type) && 656 "Not an underlying type specifier"); 657 658 SourceLocation StartLoc = ConsumeToken(); 659 SourceLocation LParenLoc = Tok.getLocation(); 660 661 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 662 "__underlying_type")) { 663 SkipUntil(tok::r_paren); 664 return; 665 } 666 667 TypeResult Result = ParseTypeName(); 668 if (Result.isInvalid()) { 669 SkipUntil(tok::r_paren); 670 return; 671 } 672 673 // Match the ')' 674 SourceLocation RParenLoc; 675 if (Tok.is(tok::r_paren)) 676 RParenLoc = ConsumeParen(); 677 else 678 MatchRHSPunctuation(tok::r_paren, LParenLoc); 679 680 if (RParenLoc.isInvalid()) 681 return; 682 683 const char *PrevSpec = 0; 684 unsigned DiagID; 685 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 686 DiagID, Result.release())) 687 Diag(StartLoc, DiagID) << PrevSpec; 688} 689 690/// ParseClassName - Parse a C++ class-name, which names a class. Note 691/// that we only check that the result names a type; semantic analysis 692/// will need to verify that the type names a class. The result is 693/// either a type or NULL, depending on whether a type name was 694/// found. 695/// 696/// class-name: [C++ 9.1] 697/// identifier 698/// simple-template-id 699/// 700Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 701 CXXScopeSpec &SS) { 702 // Check whether we have a template-id that names a type. 703 if (Tok.is(tok::annot_template_id)) { 704 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 705 if (TemplateId->Kind == TNK_Type_template || 706 TemplateId->Kind == TNK_Dependent_template_name) { 707 AnnotateTemplateIdTokenAsType(); 708 709 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 710 ParsedType Type = getTypeAnnotation(Tok); 711 EndLocation = Tok.getAnnotationEndLoc(); 712 ConsumeToken(); 713 714 if (Type) 715 return Type; 716 return true; 717 } 718 719 // Fall through to produce an error below. 720 } 721 722 if (Tok.isNot(tok::identifier)) { 723 Diag(Tok, diag::err_expected_class_name); 724 return true; 725 } 726 727 IdentifierInfo *Id = Tok.getIdentifierInfo(); 728 SourceLocation IdLoc = ConsumeToken(); 729 730 if (Tok.is(tok::less)) { 731 // It looks the user intended to write a template-id here, but the 732 // template-name was wrong. Try to fix that. 733 TemplateNameKind TNK = TNK_Type_template; 734 TemplateTy Template; 735 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 736 &SS, Template, TNK)) { 737 Diag(IdLoc, diag::err_unknown_template_name) 738 << Id; 739 } 740 741 if (!Template) 742 return true; 743 744 // Form the template name 745 UnqualifiedId TemplateName; 746 TemplateName.setIdentifier(Id, IdLoc); 747 748 // Parse the full template-id, then turn it into a type. 749 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 750 SourceLocation(), true)) 751 return true; 752 if (TNK == TNK_Dependent_template_name) 753 AnnotateTemplateIdTokenAsType(); 754 755 // If we didn't end up with a typename token, there's nothing more we 756 // can do. 757 if (Tok.isNot(tok::annot_typename)) 758 return true; 759 760 // Retrieve the type from the annotation token, consume that token, and 761 // return. 762 EndLocation = Tok.getAnnotationEndLoc(); 763 ParsedType Type = getTypeAnnotation(Tok); 764 ConsumeToken(); 765 return Type; 766 } 767 768 // We have an identifier; check whether it is actually a type. 769 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 770 false, ParsedType(), 771 /*NonTrivialTypeSourceInfo=*/true); 772 if (!Type) { 773 Diag(IdLoc, diag::err_expected_class_name); 774 return true; 775 } 776 777 // Consume the identifier. 778 EndLocation = IdLoc; 779 780 // Fake up a Declarator to use with ActOnTypeName. 781 DeclSpec DS(AttrFactory); 782 DS.SetRangeStart(IdLoc); 783 DS.SetRangeEnd(EndLocation); 784 DS.getTypeSpecScope() = SS; 785 786 const char *PrevSpec = 0; 787 unsigned DiagID; 788 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 789 790 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 791 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 792} 793 794/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 795/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 796/// until we reach the start of a definition or see a token that 797/// cannot start a definition. If SuppressDeclarations is true, we do know. 798/// 799/// class-specifier: [C++ class] 800/// class-head '{' member-specification[opt] '}' 801/// class-head '{' member-specification[opt] '}' attributes[opt] 802/// class-head: 803/// class-key identifier[opt] base-clause[opt] 804/// class-key nested-name-specifier identifier base-clause[opt] 805/// class-key nested-name-specifier[opt] simple-template-id 806/// base-clause[opt] 807/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 808/// [GNU] class-key attributes[opt] nested-name-specifier 809/// identifier base-clause[opt] 810/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 811/// simple-template-id base-clause[opt] 812/// class-key: 813/// 'class' 814/// 'struct' 815/// 'union' 816/// 817/// elaborated-type-specifier: [C++ dcl.type.elab] 818/// class-key ::[opt] nested-name-specifier[opt] identifier 819/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 820/// simple-template-id 821/// 822/// Note that the C++ class-specifier and elaborated-type-specifier, 823/// together, subsume the C99 struct-or-union-specifier: 824/// 825/// struct-or-union-specifier: [C99 6.7.2.1] 826/// struct-or-union identifier[opt] '{' struct-contents '}' 827/// struct-or-union identifier 828/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 829/// '}' attributes[opt] 830/// [GNU] struct-or-union attributes[opt] identifier 831/// struct-or-union: 832/// 'struct' 833/// 'union' 834void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 835 SourceLocation StartLoc, DeclSpec &DS, 836 const ParsedTemplateInfo &TemplateInfo, 837 AccessSpecifier AS, bool SuppressDeclarations){ 838 DeclSpec::TST TagType; 839 if (TagTokKind == tok::kw_struct) 840 TagType = DeclSpec::TST_struct; 841 else if (TagTokKind == tok::kw_class) 842 TagType = DeclSpec::TST_class; 843 else { 844 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 845 TagType = DeclSpec::TST_union; 846 } 847 848 if (Tok.is(tok::code_completion)) { 849 // Code completion for a struct, class, or union name. 850 Actions.CodeCompleteTag(getCurScope(), TagType); 851 ConsumeCodeCompletionToken(); 852 } 853 854 // C++03 [temp.explicit] 14.7.2/8: 855 // The usual access checking rules do not apply to names used to specify 856 // explicit instantiations. 857 // 858 // As an extension we do not perform access checking on the names used to 859 // specify explicit specializations either. This is important to allow 860 // specializing traits classes for private types. 861 bool SuppressingAccessChecks = false; 862 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 863 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 864 Actions.ActOnStartSuppressingAccessChecks(); 865 SuppressingAccessChecks = true; 866 } 867 868 ParsedAttributes attrs(AttrFactory); 869 // If attributes exist after tag, parse them. 870 if (Tok.is(tok::kw___attribute)) 871 ParseGNUAttributes(attrs); 872 873 // If declspecs exist after tag, parse them. 874 while (Tok.is(tok::kw___declspec)) 875 ParseMicrosoftDeclSpec(attrs); 876 877 // If C++0x attributes exist here, parse them. 878 // FIXME: Are we consistent with the ordering of parsing of different 879 // styles of attributes? 880 MaybeParseCXX0XAttributes(attrs); 881 882 if (TagType == DeclSpec::TST_struct && 883 !Tok.is(tok::identifier) && 884 Tok.getIdentifierInfo() && 885 (Tok.is(tok::kw___is_arithmetic) || 886 Tok.is(tok::kw___is_convertible) || 887 Tok.is(tok::kw___is_empty) || 888 Tok.is(tok::kw___is_floating_point) || 889 Tok.is(tok::kw___is_function) || 890 Tok.is(tok::kw___is_fundamental) || 891 Tok.is(tok::kw___is_integral) || 892 Tok.is(tok::kw___is_member_function_pointer) || 893 Tok.is(tok::kw___is_member_pointer) || 894 Tok.is(tok::kw___is_pod) || 895 Tok.is(tok::kw___is_pointer) || 896 Tok.is(tok::kw___is_same) || 897 Tok.is(tok::kw___is_scalar) || 898 Tok.is(tok::kw___is_signed) || 899 Tok.is(tok::kw___is_unsigned) || 900 Tok.is(tok::kw___is_void))) { 901 // GNU libstdc++ 4.2 and libc++ uaw certain intrinsic names as the 902 // name of struct templates, but some are keywords in GCC >= 4.3 903 // and Clang. Therefore, when we see the token sequence "struct 904 // X", make X into a normal identifier rather than a keyword, to 905 // allow libstdc++ 4.2 and libc++ to work properly. 906 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 907 Tok.setKind(tok::identifier); 908 } 909 910 // Parse the (optional) nested-name-specifier. 911 CXXScopeSpec &SS = DS.getTypeSpecScope(); 912 if (getLang().CPlusPlus) { 913 // "FOO : BAR" is not a potential typo for "FOO::BAR". 914 ColonProtectionRAIIObject X(*this); 915 916 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 917 DS.SetTypeSpecError(); 918 if (SS.isSet()) 919 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 920 Diag(Tok, diag::err_expected_ident); 921 } 922 923 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 924 925 // Parse the (optional) class name or simple-template-id. 926 IdentifierInfo *Name = 0; 927 SourceLocation NameLoc; 928 TemplateIdAnnotation *TemplateId = 0; 929 if (Tok.is(tok::identifier)) { 930 Name = Tok.getIdentifierInfo(); 931 NameLoc = ConsumeToken(); 932 933 if (Tok.is(tok::less) && getLang().CPlusPlus) { 934 // The name was supposed to refer to a template, but didn't. 935 // Eat the template argument list and try to continue parsing this as 936 // a class (or template thereof). 937 TemplateArgList TemplateArgs; 938 SourceLocation LAngleLoc, RAngleLoc; 939 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 940 true, LAngleLoc, 941 TemplateArgs, RAngleLoc)) { 942 // We couldn't parse the template argument list at all, so don't 943 // try to give any location information for the list. 944 LAngleLoc = RAngleLoc = SourceLocation(); 945 } 946 947 Diag(NameLoc, diag::err_explicit_spec_non_template) 948 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 949 << (TagType == DeclSpec::TST_class? 0 950 : TagType == DeclSpec::TST_struct? 1 951 : 2) 952 << Name 953 << SourceRange(LAngleLoc, RAngleLoc); 954 955 // Strip off the last template parameter list if it was empty, since 956 // we've removed its template argument list. 957 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 958 if (TemplateParams && TemplateParams->size() > 1) { 959 TemplateParams->pop_back(); 960 } else { 961 TemplateParams = 0; 962 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 963 = ParsedTemplateInfo::NonTemplate; 964 } 965 } else if (TemplateInfo.Kind 966 == ParsedTemplateInfo::ExplicitInstantiation) { 967 // Pretend this is just a forward declaration. 968 TemplateParams = 0; 969 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 970 = ParsedTemplateInfo::NonTemplate; 971 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 972 = SourceLocation(); 973 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 974 = SourceLocation(); 975 } 976 } 977 } else if (Tok.is(tok::annot_template_id)) { 978 TemplateId = takeTemplateIdAnnotation(Tok); 979 NameLoc = ConsumeToken(); 980 981 if (TemplateId->Kind != TNK_Type_template && 982 TemplateId->Kind != TNK_Dependent_template_name) { 983 // The template-name in the simple-template-id refers to 984 // something other than a class template. Give an appropriate 985 // error message and skip to the ';'. 986 SourceRange Range(NameLoc); 987 if (SS.isNotEmpty()) 988 Range.setBegin(SS.getBeginLoc()); 989 990 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 991 << Name << static_cast<int>(TemplateId->Kind) << Range; 992 993 DS.SetTypeSpecError(); 994 SkipUntil(tok::semi, false, true); 995 if (SuppressingAccessChecks) 996 Actions.ActOnStopSuppressingAccessChecks(); 997 998 return; 999 } 1000 } 1001 1002 // As soon as we're finished parsing the class's template-id, turn access 1003 // checking back on. 1004 if (SuppressingAccessChecks) 1005 Actions.ActOnStopSuppressingAccessChecks(); 1006 1007 // There are four options here. If we have 'struct foo;', then this 1008 // is either a forward declaration or a friend declaration, which 1009 // have to be treated differently. If we have 'struct foo {...', 1010 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1011 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1012 // However, in some contexts, things look like declarations but are just 1013 // references, e.g. 1014 // new struct s; 1015 // or 1016 // &T::operator struct s; 1017 // For these, SuppressDeclarations is true. 1018 Sema::TagUseKind TUK; 1019 if (SuppressDeclarations) 1020 TUK = Sema::TUK_Reference; 1021 else if (Tok.is(tok::l_brace) || 1022 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1023 isCXX0XFinalKeyword()) { 1024 if (DS.isFriendSpecified()) { 1025 // C++ [class.friend]p2: 1026 // A class shall not be defined in a friend declaration. 1027 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1028 << SourceRange(DS.getFriendSpecLoc()); 1029 1030 // Skip everything up to the semicolon, so that this looks like a proper 1031 // friend class (or template thereof) declaration. 1032 SkipUntil(tok::semi, true, true); 1033 TUK = Sema::TUK_Friend; 1034 } else { 1035 // Okay, this is a class definition. 1036 TUK = Sema::TUK_Definition; 1037 } 1038 } else if (Tok.is(tok::semi)) 1039 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1040 else 1041 TUK = Sema::TUK_Reference; 1042 1043 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1044 TUK != Sema::TUK_Definition)) { 1045 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1046 // We have a declaration or reference to an anonymous class. 1047 Diag(StartLoc, diag::err_anon_type_definition) 1048 << DeclSpec::getSpecifierName(TagType); 1049 } 1050 1051 SkipUntil(tok::comma, true); 1052 return; 1053 } 1054 1055 // Create the tag portion of the class or class template. 1056 DeclResult TagOrTempResult = true; // invalid 1057 TypeResult TypeResult = true; // invalid 1058 1059 bool Owned = false; 1060 if (TemplateId) { 1061 // Explicit specialization, class template partial specialization, 1062 // or explicit instantiation. 1063 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1064 TemplateId->getTemplateArgs(), 1065 TemplateId->NumArgs); 1066 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1067 TUK == Sema::TUK_Declaration) { 1068 // This is an explicit instantiation of a class template. 1069 TagOrTempResult 1070 = Actions.ActOnExplicitInstantiation(getCurScope(), 1071 TemplateInfo.ExternLoc, 1072 TemplateInfo.TemplateLoc, 1073 TagType, 1074 StartLoc, 1075 SS, 1076 TemplateId->Template, 1077 TemplateId->TemplateNameLoc, 1078 TemplateId->LAngleLoc, 1079 TemplateArgsPtr, 1080 TemplateId->RAngleLoc, 1081 attrs.getList()); 1082 1083 // Friend template-ids are treated as references unless 1084 // they have template headers, in which case they're ill-formed 1085 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1086 // We diagnose this error in ActOnClassTemplateSpecialization. 1087 } else if (TUK == Sema::TUK_Reference || 1088 (TUK == Sema::TUK_Friend && 1089 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1090 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1091 StartLoc, 1092 TemplateId->SS, 1093 TemplateId->Template, 1094 TemplateId->TemplateNameLoc, 1095 TemplateId->LAngleLoc, 1096 TemplateArgsPtr, 1097 TemplateId->RAngleLoc); 1098 } else { 1099 // This is an explicit specialization or a class template 1100 // partial specialization. 1101 TemplateParameterLists FakedParamLists; 1102 1103 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1104 // This looks like an explicit instantiation, because we have 1105 // something like 1106 // 1107 // template class Foo<X> 1108 // 1109 // but it actually has a definition. Most likely, this was 1110 // meant to be an explicit specialization, but the user forgot 1111 // the '<>' after 'template'. 1112 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1113 1114 SourceLocation LAngleLoc 1115 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1116 Diag(TemplateId->TemplateNameLoc, 1117 diag::err_explicit_instantiation_with_definition) 1118 << SourceRange(TemplateInfo.TemplateLoc) 1119 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1120 1121 // Create a fake template parameter list that contains only 1122 // "template<>", so that we treat this construct as a class 1123 // template specialization. 1124 FakedParamLists.push_back( 1125 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1126 TemplateInfo.TemplateLoc, 1127 LAngleLoc, 1128 0, 0, 1129 LAngleLoc)); 1130 TemplateParams = &FakedParamLists; 1131 } 1132 1133 // Build the class template specialization. 1134 TagOrTempResult 1135 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1136 StartLoc, SS, 1137 TemplateId->Template, 1138 TemplateId->TemplateNameLoc, 1139 TemplateId->LAngleLoc, 1140 TemplateArgsPtr, 1141 TemplateId->RAngleLoc, 1142 attrs.getList(), 1143 MultiTemplateParamsArg(Actions, 1144 TemplateParams? &(*TemplateParams)[0] : 0, 1145 TemplateParams? TemplateParams->size() : 0)); 1146 } 1147 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1148 TUK == Sema::TUK_Declaration) { 1149 // Explicit instantiation of a member of a class template 1150 // specialization, e.g., 1151 // 1152 // template struct Outer<int>::Inner; 1153 // 1154 TagOrTempResult 1155 = Actions.ActOnExplicitInstantiation(getCurScope(), 1156 TemplateInfo.ExternLoc, 1157 TemplateInfo.TemplateLoc, 1158 TagType, StartLoc, SS, Name, 1159 NameLoc, attrs.getList()); 1160 } else if (TUK == Sema::TUK_Friend && 1161 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1162 TagOrTempResult = 1163 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1164 TagType, StartLoc, SS, 1165 Name, NameLoc, attrs.getList(), 1166 MultiTemplateParamsArg(Actions, 1167 TemplateParams? &(*TemplateParams)[0] : 0, 1168 TemplateParams? TemplateParams->size() : 0)); 1169 } else { 1170 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1171 TUK == Sema::TUK_Definition) { 1172 // FIXME: Diagnose this particular error. 1173 } 1174 1175 bool IsDependent = false; 1176 1177 // Don't pass down template parameter lists if this is just a tag 1178 // reference. For example, we don't need the template parameters here: 1179 // template <class T> class A *makeA(T t); 1180 MultiTemplateParamsArg TParams; 1181 if (TUK != Sema::TUK_Reference && TemplateParams) 1182 TParams = 1183 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1184 1185 // Declaration or definition of a class type 1186 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1187 SS, Name, NameLoc, attrs.getList(), AS, 1188 TParams, Owned, IsDependent, false, 1189 false, clang::TypeResult()); 1190 1191 // If ActOnTag said the type was dependent, try again with the 1192 // less common call. 1193 if (IsDependent) { 1194 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1195 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1196 SS, Name, StartLoc, NameLoc); 1197 } 1198 } 1199 1200 // If there is a body, parse it and inform the actions module. 1201 if (TUK == Sema::TUK_Definition) { 1202 assert(Tok.is(tok::l_brace) || 1203 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1204 isCXX0XFinalKeyword()); 1205 if (getLang().CPlusPlus) 1206 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1207 else 1208 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1209 } 1210 1211 const char *PrevSpec = 0; 1212 unsigned DiagID; 1213 bool Result; 1214 if (!TypeResult.isInvalid()) { 1215 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1216 NameLoc.isValid() ? NameLoc : StartLoc, 1217 PrevSpec, DiagID, TypeResult.get()); 1218 } else if (!TagOrTempResult.isInvalid()) { 1219 Result = DS.SetTypeSpecType(TagType, StartLoc, 1220 NameLoc.isValid() ? NameLoc : StartLoc, 1221 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1222 } else { 1223 DS.SetTypeSpecError(); 1224 return; 1225 } 1226 1227 if (Result) 1228 Diag(StartLoc, DiagID) << PrevSpec; 1229 1230 // At this point, we've successfully parsed a class-specifier in 'definition' 1231 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1232 // going to look at what comes after it to improve error recovery. If an 1233 // impossible token occurs next, we assume that the programmer forgot a ; at 1234 // the end of the declaration and recover that way. 1235 // 1236 // This switch enumerates the valid "follow" set for definition. 1237 if (TUK == Sema::TUK_Definition) { 1238 bool ExpectedSemi = true; 1239 switch (Tok.getKind()) { 1240 default: break; 1241 case tok::semi: // struct foo {...} ; 1242 case tok::star: // struct foo {...} * P; 1243 case tok::amp: // struct foo {...} & R = ... 1244 case tok::identifier: // struct foo {...} V ; 1245 case tok::r_paren: //(struct foo {...} ) {4} 1246 case tok::annot_cxxscope: // struct foo {...} a:: b; 1247 case tok::annot_typename: // struct foo {...} a ::b; 1248 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1249 case tok::l_paren: // struct foo {...} ( x); 1250 case tok::comma: // __builtin_offsetof(struct foo{...} , 1251 ExpectedSemi = false; 1252 break; 1253 // Type qualifiers 1254 case tok::kw_const: // struct foo {...} const x; 1255 case tok::kw_volatile: // struct foo {...} volatile x; 1256 case tok::kw_restrict: // struct foo {...} restrict x; 1257 case tok::kw_inline: // struct foo {...} inline foo() {}; 1258 // Storage-class specifiers 1259 case tok::kw_static: // struct foo {...} static x; 1260 case tok::kw_extern: // struct foo {...} extern x; 1261 case tok::kw_typedef: // struct foo {...} typedef x; 1262 case tok::kw_register: // struct foo {...} register x; 1263 case tok::kw_auto: // struct foo {...} auto x; 1264 case tok::kw_mutable: // struct foo {...} mutable x; 1265 // As shown above, type qualifiers and storage class specifiers absolutely 1266 // can occur after class specifiers according to the grammar. However, 1267 // almost no one actually writes code like this. If we see one of these, 1268 // it is much more likely that someone missed a semi colon and the 1269 // type/storage class specifier we're seeing is part of the *next* 1270 // intended declaration, as in: 1271 // 1272 // struct foo { ... } 1273 // typedef int X; 1274 // 1275 // We'd really like to emit a missing semicolon error instead of emitting 1276 // an error on the 'int' saying that you can't have two type specifiers in 1277 // the same declaration of X. Because of this, we look ahead past this 1278 // token to see if it's a type specifier. If so, we know the code is 1279 // otherwise invalid, so we can produce the expected semi error. 1280 if (!isKnownToBeTypeSpecifier(NextToken())) 1281 ExpectedSemi = false; 1282 break; 1283 1284 case tok::r_brace: // struct bar { struct foo {...} } 1285 // Missing ';' at end of struct is accepted as an extension in C mode. 1286 if (!getLang().CPlusPlus) 1287 ExpectedSemi = false; 1288 break; 1289 } 1290 1291 if (ExpectedSemi) { 1292 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1293 TagType == DeclSpec::TST_class ? "class" 1294 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1295 // Push this token back into the preprocessor and change our current token 1296 // to ';' so that the rest of the code recovers as though there were an 1297 // ';' after the definition. 1298 PP.EnterToken(Tok); 1299 Tok.setKind(tok::semi); 1300 } 1301 } 1302} 1303 1304/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1305/// 1306/// base-clause : [C++ class.derived] 1307/// ':' base-specifier-list 1308/// base-specifier-list: 1309/// base-specifier '...'[opt] 1310/// base-specifier-list ',' base-specifier '...'[opt] 1311void Parser::ParseBaseClause(Decl *ClassDecl) { 1312 assert(Tok.is(tok::colon) && "Not a base clause"); 1313 ConsumeToken(); 1314 1315 // Build up an array of parsed base specifiers. 1316 llvm::SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1317 1318 while (true) { 1319 // Parse a base-specifier. 1320 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1321 if (Result.isInvalid()) { 1322 // Skip the rest of this base specifier, up until the comma or 1323 // opening brace. 1324 SkipUntil(tok::comma, tok::l_brace, true, true); 1325 } else { 1326 // Add this to our array of base specifiers. 1327 BaseInfo.push_back(Result.get()); 1328 } 1329 1330 // If the next token is a comma, consume it and keep reading 1331 // base-specifiers. 1332 if (Tok.isNot(tok::comma)) break; 1333 1334 // Consume the comma. 1335 ConsumeToken(); 1336 } 1337 1338 // Attach the base specifiers 1339 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1340} 1341 1342/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1343/// one entry in the base class list of a class specifier, for example: 1344/// class foo : public bar, virtual private baz { 1345/// 'public bar' and 'virtual private baz' are each base-specifiers. 1346/// 1347/// base-specifier: [C++ class.derived] 1348/// ::[opt] nested-name-specifier[opt] class-name 1349/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1350/// class-name 1351/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1352/// class-name 1353Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1354 bool IsVirtual = false; 1355 SourceLocation StartLoc = Tok.getLocation(); 1356 1357 // Parse the 'virtual' keyword. 1358 if (Tok.is(tok::kw_virtual)) { 1359 ConsumeToken(); 1360 IsVirtual = true; 1361 } 1362 1363 // Parse an (optional) access specifier. 1364 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1365 if (Access != AS_none) 1366 ConsumeToken(); 1367 1368 // Parse the 'virtual' keyword (again!), in case it came after the 1369 // access specifier. 1370 if (Tok.is(tok::kw_virtual)) { 1371 SourceLocation VirtualLoc = ConsumeToken(); 1372 if (IsVirtual) { 1373 // Complain about duplicate 'virtual' 1374 Diag(VirtualLoc, diag::err_dup_virtual) 1375 << FixItHint::CreateRemoval(VirtualLoc); 1376 } 1377 1378 IsVirtual = true; 1379 } 1380 1381 // Parse optional '::' and optional nested-name-specifier. 1382 CXXScopeSpec SS; 1383 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1384 1385 // The location of the base class itself. 1386 SourceLocation BaseLoc = Tok.getLocation(); 1387 1388 // Parse the class-name. 1389 SourceLocation EndLocation; 1390 TypeResult BaseType = ParseClassName(EndLocation, SS); 1391 if (BaseType.isInvalid()) 1392 return true; 1393 1394 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1395 // actually part of the base-specifier-list grammar productions, but we 1396 // parse it here for convenience. 1397 SourceLocation EllipsisLoc; 1398 if (Tok.is(tok::ellipsis)) 1399 EllipsisLoc = ConsumeToken(); 1400 1401 // Find the complete source range for the base-specifier. 1402 SourceRange Range(StartLoc, EndLocation); 1403 1404 // Notify semantic analysis that we have parsed a complete 1405 // base-specifier. 1406 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1407 BaseType.get(), BaseLoc, EllipsisLoc); 1408} 1409 1410/// getAccessSpecifierIfPresent - Determine whether the next token is 1411/// a C++ access-specifier. 1412/// 1413/// access-specifier: [C++ class.derived] 1414/// 'private' 1415/// 'protected' 1416/// 'public' 1417AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1418 switch (Tok.getKind()) { 1419 default: return AS_none; 1420 case tok::kw_private: return AS_private; 1421 case tok::kw_protected: return AS_protected; 1422 case tok::kw_public: return AS_public; 1423 } 1424} 1425 1426void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1427 Decl *ThisDecl) { 1428 // We just declared a member function. If this member function 1429 // has any default arguments, we'll need to parse them later. 1430 LateParsedMethodDeclaration *LateMethod = 0; 1431 DeclaratorChunk::FunctionTypeInfo &FTI 1432 = DeclaratorInfo.getFunctionTypeInfo(); 1433 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1434 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1435 if (!LateMethod) { 1436 // Push this method onto the stack of late-parsed method 1437 // declarations. 1438 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1439 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1440 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1441 1442 // Add all of the parameters prior to this one (they don't 1443 // have default arguments). 1444 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1445 for (unsigned I = 0; I < ParamIdx; ++I) 1446 LateMethod->DefaultArgs.push_back( 1447 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1448 } 1449 1450 // Add this parameter to the list of parameters (it or may 1451 // not have a default argument). 1452 LateMethod->DefaultArgs.push_back( 1453 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1454 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1455 } 1456 } 1457} 1458 1459/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1460/// virt-specifier. 1461/// 1462/// virt-specifier: 1463/// override 1464/// final 1465VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1466 if (!getLang().CPlusPlus) 1467 return VirtSpecifiers::VS_None; 1468 1469 if (Tok.is(tok::identifier)) { 1470 IdentifierInfo *II = Tok.getIdentifierInfo(); 1471 1472 // Initialize the contextual keywords. 1473 if (!Ident_final) { 1474 Ident_final = &PP.getIdentifierTable().get("final"); 1475 Ident_override = &PP.getIdentifierTable().get("override"); 1476 } 1477 1478 if (II == Ident_override) 1479 return VirtSpecifiers::VS_Override; 1480 1481 if (II == Ident_final) 1482 return VirtSpecifiers::VS_Final; 1483 } 1484 1485 return VirtSpecifiers::VS_None; 1486} 1487 1488/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1489/// 1490/// virt-specifier-seq: 1491/// virt-specifier 1492/// virt-specifier-seq virt-specifier 1493void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1494 while (true) { 1495 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1496 if (Specifier == VirtSpecifiers::VS_None) 1497 return; 1498 1499 // C++ [class.mem]p8: 1500 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1501 const char *PrevSpec = 0; 1502 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1503 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1504 << PrevSpec 1505 << FixItHint::CreateRemoval(Tok.getLocation()); 1506 1507 if (!getLang().CPlusPlus0x) 1508 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1509 << VirtSpecifiers::getSpecifierName(Specifier); 1510 ConsumeToken(); 1511 } 1512} 1513 1514/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1515/// contextual 'final' keyword. 1516bool Parser::isCXX0XFinalKeyword() const { 1517 if (!getLang().CPlusPlus) 1518 return false; 1519 1520 if (!Tok.is(tok::identifier)) 1521 return false; 1522 1523 // Initialize the contextual keywords. 1524 if (!Ident_final) { 1525 Ident_final = &PP.getIdentifierTable().get("final"); 1526 Ident_override = &PP.getIdentifierTable().get("override"); 1527 } 1528 1529 return Tok.getIdentifierInfo() == Ident_final; 1530} 1531 1532/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1533/// 1534/// member-declaration: 1535/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1536/// function-definition ';'[opt] 1537/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1538/// using-declaration [TODO] 1539/// [C++0x] static_assert-declaration 1540/// template-declaration 1541/// [GNU] '__extension__' member-declaration 1542/// 1543/// member-declarator-list: 1544/// member-declarator 1545/// member-declarator-list ',' member-declarator 1546/// 1547/// member-declarator: 1548/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1549/// declarator constant-initializer[opt] 1550/// [C++11] declarator brace-or-equal-initializer[opt] 1551/// identifier[opt] ':' constant-expression 1552/// 1553/// virt-specifier-seq: 1554/// virt-specifier 1555/// virt-specifier-seq virt-specifier 1556/// 1557/// virt-specifier: 1558/// override 1559/// final 1560/// new 1561/// 1562/// pure-specifier: 1563/// '= 0' 1564/// 1565/// constant-initializer: 1566/// '=' constant-expression 1567/// 1568void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1569 const ParsedTemplateInfo &TemplateInfo, 1570 ParsingDeclRAIIObject *TemplateDiags) { 1571 if (Tok.is(tok::at)) { 1572 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1573 Diag(Tok, diag::err_at_defs_cxx); 1574 else 1575 Diag(Tok, diag::err_at_in_class); 1576 1577 ConsumeToken(); 1578 SkipUntil(tok::r_brace); 1579 return; 1580 } 1581 1582 // Access declarations. 1583 if (!TemplateInfo.Kind && 1584 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1585 !TryAnnotateCXXScopeToken() && 1586 Tok.is(tok::annot_cxxscope)) { 1587 bool isAccessDecl = false; 1588 if (NextToken().is(tok::identifier)) 1589 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1590 else 1591 isAccessDecl = NextToken().is(tok::kw_operator); 1592 1593 if (isAccessDecl) { 1594 // Collect the scope specifier token we annotated earlier. 1595 CXXScopeSpec SS; 1596 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1597 1598 // Try to parse an unqualified-id. 1599 UnqualifiedId Name; 1600 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1601 SkipUntil(tok::semi); 1602 return; 1603 } 1604 1605 // TODO: recover from mistakenly-qualified operator declarations. 1606 if (ExpectAndConsume(tok::semi, 1607 diag::err_expected_semi_after, 1608 "access declaration", 1609 tok::semi)) 1610 return; 1611 1612 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1613 false, SourceLocation(), 1614 SS, Name, 1615 /* AttrList */ 0, 1616 /* IsTypeName */ false, 1617 SourceLocation()); 1618 return; 1619 } 1620 } 1621 1622 // static_assert-declaration 1623 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1624 // FIXME: Check for templates 1625 SourceLocation DeclEnd; 1626 ParseStaticAssertDeclaration(DeclEnd); 1627 return; 1628 } 1629 1630 if (Tok.is(tok::kw_template)) { 1631 assert(!TemplateInfo.TemplateParams && 1632 "Nested template improperly parsed?"); 1633 SourceLocation DeclEnd; 1634 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1635 AS); 1636 return; 1637 } 1638 1639 // Handle: member-declaration ::= '__extension__' member-declaration 1640 if (Tok.is(tok::kw___extension__)) { 1641 // __extension__ silences extension warnings in the subexpression. 1642 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1643 ConsumeToken(); 1644 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1645 } 1646 1647 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1648 // is a bitfield. 1649 ColonProtectionRAIIObject X(*this); 1650 1651 ParsedAttributesWithRange attrs(AttrFactory); 1652 // Optional C++0x attribute-specifier 1653 MaybeParseCXX0XAttributes(attrs); 1654 MaybeParseMicrosoftAttributes(attrs); 1655 1656 if (Tok.is(tok::kw_using)) { 1657 ProhibitAttributes(attrs); 1658 1659 // Eat 'using'. 1660 SourceLocation UsingLoc = ConsumeToken(); 1661 1662 if (Tok.is(tok::kw_namespace)) { 1663 Diag(UsingLoc, diag::err_using_namespace_in_class); 1664 SkipUntil(tok::semi, true, true); 1665 } else { 1666 SourceLocation DeclEnd; 1667 // Otherwise, it must be a using-declaration or an alias-declaration. 1668 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1669 UsingLoc, DeclEnd, AS); 1670 } 1671 return; 1672 } 1673 1674 // decl-specifier-seq: 1675 // Parse the common declaration-specifiers piece. 1676 ParsingDeclSpec DS(*this, TemplateDiags); 1677 DS.takeAttributesFrom(attrs); 1678 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1679 1680 MultiTemplateParamsArg TemplateParams(Actions, 1681 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1682 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1683 1684 if (Tok.is(tok::semi)) { 1685 ConsumeToken(); 1686 Decl *TheDecl = 1687 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1688 DS.complete(TheDecl); 1689 return; 1690 } 1691 1692 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1693 VirtSpecifiers VS; 1694 ExprResult Init; 1695 1696 if (Tok.isNot(tok::colon)) { 1697 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1698 ColonProtectionRAIIObject X(*this); 1699 1700 // Parse the first declarator. 1701 ParseDeclarator(DeclaratorInfo); 1702 // Error parsing the declarator? 1703 if (!DeclaratorInfo.hasName()) { 1704 // If so, skip until the semi-colon or a }. 1705 SkipUntil(tok::r_brace, true, true); 1706 if (Tok.is(tok::semi)) 1707 ConsumeToken(); 1708 return; 1709 } 1710 1711 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1712 1713 // If attributes exist after the declarator, but before an '{', parse them. 1714 MaybeParseGNUAttributes(DeclaratorInfo); 1715 1716 // MSVC permits pure specifier on inline functions declared at class scope. 1717 // Hence check for =0 before checking for function definition. 1718 if (getLang().Microsoft && Tok.is(tok::equal) && 1719 DeclaratorInfo.isFunctionDeclarator() && 1720 NextToken().is(tok::numeric_constant)) { 1721 ConsumeToken(); 1722 Init = ParseInitializer(); 1723 if (Init.isInvalid()) 1724 SkipUntil(tok::comma, true, true); 1725 } 1726 1727 bool IsDefinition = false; 1728 // function-definition: 1729 // 1730 // In C++11, a non-function declarator followed by an open brace is a 1731 // braced-init-list for an in-class member initialization, not an 1732 // erroneous function definition. 1733 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1734 IsDefinition = true; 1735 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1736 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1737 IsDefinition = true; 1738 } else if (Tok.is(tok::equal)) { 1739 const Token &KW = NextToken(); 1740 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1741 IsDefinition = true; 1742 } 1743 } 1744 1745 if (IsDefinition) { 1746 if (!DeclaratorInfo.isFunctionDeclarator()) { 1747 Diag(Tok, diag::err_func_def_no_params); 1748 ConsumeBrace(); 1749 SkipUntil(tok::r_brace, true); 1750 1751 // Consume the optional ';' 1752 if (Tok.is(tok::semi)) 1753 ConsumeToken(); 1754 return; 1755 } 1756 1757 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1758 Diag(Tok, diag::err_function_declared_typedef); 1759 // This recovery skips the entire function body. It would be nice 1760 // to simply call ParseCXXInlineMethodDef() below, however Sema 1761 // assumes the declarator represents a function, not a typedef. 1762 ConsumeBrace(); 1763 SkipUntil(tok::r_brace, true); 1764 1765 // Consume the optional ';' 1766 if (Tok.is(tok::semi)) 1767 ConsumeToken(); 1768 return; 1769 } 1770 1771 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init); 1772 1773 // Consume the ';' - it's optional unless we have a delete or default 1774 if (Tok.is(tok::semi)) { 1775 ConsumeToken(); 1776 } 1777 1778 return; 1779 } 1780 } 1781 1782 // member-declarator-list: 1783 // member-declarator 1784 // member-declarator-list ',' member-declarator 1785 1786 llvm::SmallVector<Decl *, 8> DeclsInGroup; 1787 ExprResult BitfieldSize; 1788 1789 while (1) { 1790 // member-declarator: 1791 // declarator pure-specifier[opt] 1792 // declarator brace-or-equal-initializer[opt] 1793 // identifier[opt] ':' constant-expression 1794 if (Tok.is(tok::colon)) { 1795 ConsumeToken(); 1796 BitfieldSize = ParseConstantExpression(); 1797 if (BitfieldSize.isInvalid()) 1798 SkipUntil(tok::comma, true, true); 1799 } 1800 1801 // If a simple-asm-expr is present, parse it. 1802 if (Tok.is(tok::kw_asm)) { 1803 SourceLocation Loc; 1804 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1805 if (AsmLabel.isInvalid()) 1806 SkipUntil(tok::comma, true, true); 1807 1808 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1809 DeclaratorInfo.SetRangeEnd(Loc); 1810 } 1811 1812 // If attributes exist after the declarator, parse them. 1813 MaybeParseGNUAttributes(DeclaratorInfo); 1814 1815 // FIXME: When g++ adds support for this, we'll need to check whether it 1816 // goes before or after the GNU attributes and __asm__. 1817 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1818 1819 bool HasDeferredInitializer = false; 1820 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) { 1821 if (BitfieldSize.get()) { 1822 Diag(Tok, diag::err_bitfield_member_init); 1823 SkipUntil(tok::comma, true, true); 1824 } else { 1825 HasDeferredInitializer = !DeclaratorInfo.isFunctionDeclarator() && 1826 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1827 != DeclSpec::SCS_static && 1828 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1829 != DeclSpec::SCS_typedef; 1830 1831 if (!HasDeferredInitializer) { 1832 SourceLocation EqualLoc; 1833 Init = ParseCXXMemberInitializer( 1834 DeclaratorInfo.isFunctionDeclarator(), EqualLoc); 1835 if (Init.isInvalid()) 1836 SkipUntil(tok::comma, true, true); 1837 } 1838 } 1839 } 1840 1841 // NOTE: If Sema is the Action module and declarator is an instance field, 1842 // this call will *not* return the created decl; It will return null. 1843 // See Sema::ActOnCXXMemberDeclarator for details. 1844 1845 Decl *ThisDecl = 0; 1846 if (DS.isFriendSpecified()) { 1847 // TODO: handle initializers, bitfields, 'delete' 1848 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1849 /*IsDefinition*/ false, 1850 move(TemplateParams)); 1851 } else { 1852 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1853 DeclaratorInfo, 1854 move(TemplateParams), 1855 BitfieldSize.release(), 1856 VS, Init.release(), 1857 HasDeferredInitializer, 1858 /*IsDefinition*/ false); 1859 } 1860 if (ThisDecl) 1861 DeclsInGroup.push_back(ThisDecl); 1862 1863 if (DeclaratorInfo.isFunctionDeclarator() && 1864 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1865 != DeclSpec::SCS_typedef) { 1866 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1867 } 1868 1869 DeclaratorInfo.complete(ThisDecl); 1870 1871 if (HasDeferredInitializer) { 1872 if (!getLang().CPlusPlus0x) 1873 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension); 1874 1875 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1876 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1877 // declarator is followed by an initializer. 1878 // 1879 // A brace-or-equal-initializer for a member-declarator is not an 1880 // initializer in the gramamr, so this is ill-formed. 1881 Diag(Tok, diag::err_incomplete_array_member_init); 1882 SkipUntil(tok::comma, true, true); 1883 // Avoid later warnings about a class member of incomplete type. 1884 ThisDecl->setInvalidDecl(); 1885 } else 1886 ParseCXXNonStaticMemberInitializer(ThisDecl); 1887 } 1888 1889 // If we don't have a comma, it is either the end of the list (a ';') 1890 // or an error, bail out. 1891 if (Tok.isNot(tok::comma)) 1892 break; 1893 1894 // Consume the comma. 1895 ConsumeToken(); 1896 1897 // Parse the next declarator. 1898 DeclaratorInfo.clear(); 1899 VS.clear(); 1900 BitfieldSize = 0; 1901 Init = 0; 1902 1903 // Attributes are only allowed on the second declarator. 1904 MaybeParseGNUAttributes(DeclaratorInfo); 1905 1906 if (Tok.isNot(tok::colon)) 1907 ParseDeclarator(DeclaratorInfo); 1908 } 1909 1910 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1911 // Skip to end of block or statement. 1912 SkipUntil(tok::r_brace, true, true); 1913 // If we stopped at a ';', eat it. 1914 if (Tok.is(tok::semi)) ConsumeToken(); 1915 return; 1916 } 1917 1918 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1919 DeclsInGroup.size()); 1920} 1921 1922/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1923/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1924/// function definition. The location of the '=', if any, will be placed in 1925/// EqualLoc. 1926/// 1927/// pure-specifier: 1928/// '= 0' 1929/// 1930/// brace-or-equal-initializer: 1931/// '=' initializer-expression 1932/// braced-init-list [TODO] 1933/// 1934/// initializer-clause: 1935/// assignment-expression 1936/// braced-init-list [TODO] 1937/// 1938/// defaulted/deleted function-definition: 1939/// '=' 'default' 1940/// '=' 'delete' 1941/// 1942/// Prior to C++0x, the assignment-expression in an initializer-clause must 1943/// be a constant-expression. 1944ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1945 SourceLocation &EqualLoc) { 1946 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 1947 && "Data member initializer not starting with '=' or '{'"); 1948 1949 if (Tok.is(tok::equal)) { 1950 EqualLoc = ConsumeToken(); 1951 if (Tok.is(tok::kw_delete)) { 1952 // In principle, an initializer of '= delete p;' is legal, but it will 1953 // never type-check. It's better to diagnose it as an ill-formed expression 1954 // than as an ill-formed deleted non-function member. 1955 // An initializer of '= delete p, foo' will never be parsed, because 1956 // a top-level comma always ends the initializer expression. 1957 const Token &Next = NextToken(); 1958 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 1959 Next.is(tok::eof)) { 1960 if (IsFunction) 1961 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1962 << 1 /* delete */; 1963 else 1964 Diag(ConsumeToken(), diag::err_deleted_non_function); 1965 return ExprResult(); 1966 } 1967 } else if (Tok.is(tok::kw_default)) { 1968 Diag(ConsumeToken(), diag::err_default_special_members); 1969 if (IsFunction) 1970 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 1971 << 0 /* default */; 1972 else 1973 Diag(ConsumeToken(), diag::err_default_special_members); 1974 return ExprResult(); 1975 } 1976 1977 return ParseInitializer(); 1978 } else 1979 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 1980} 1981 1982/// ParseCXXMemberSpecification - Parse the class definition. 1983/// 1984/// member-specification: 1985/// member-declaration member-specification[opt] 1986/// access-specifier ':' member-specification[opt] 1987/// 1988void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1989 unsigned TagType, Decl *TagDecl) { 1990 assert((TagType == DeclSpec::TST_struct || 1991 TagType == DeclSpec::TST_union || 1992 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1993 1994 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 1995 "parsing struct/union/class body"); 1996 1997 // Determine whether this is a non-nested class. Note that local 1998 // classes are *not* considered to be nested classes. 1999 bool NonNestedClass = true; 2000 if (!ClassStack.empty()) { 2001 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2002 if (S->isClassScope()) { 2003 // We're inside a class scope, so this is a nested class. 2004 NonNestedClass = false; 2005 break; 2006 } 2007 2008 if ((S->getFlags() & Scope::FnScope)) { 2009 // If we're in a function or function template declared in the 2010 // body of a class, then this is a local class rather than a 2011 // nested class. 2012 const Scope *Parent = S->getParent(); 2013 if (Parent->isTemplateParamScope()) 2014 Parent = Parent->getParent(); 2015 if (Parent->isClassScope()) 2016 break; 2017 } 2018 } 2019 } 2020 2021 // Enter a scope for the class. 2022 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2023 2024 // Note that we are parsing a new (potentially-nested) class definition. 2025 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2026 2027 if (TagDecl) 2028 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2029 2030 SourceLocation FinalLoc; 2031 2032 // Parse the optional 'final' keyword. 2033 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2034 IdentifierInfo *II = Tok.getIdentifierInfo(); 2035 2036 // Initialize the contextual keywords. 2037 if (!Ident_final) { 2038 Ident_final = &PP.getIdentifierTable().get("final"); 2039 Ident_override = &PP.getIdentifierTable().get("override"); 2040 } 2041 2042 if (II == Ident_final) 2043 FinalLoc = ConsumeToken(); 2044 2045 if (!getLang().CPlusPlus0x) 2046 Diag(FinalLoc, diag::ext_override_control_keyword) << "final"; 2047 } 2048 2049 if (Tok.is(tok::colon)) { 2050 ParseBaseClause(TagDecl); 2051 2052 if (!Tok.is(tok::l_brace)) { 2053 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2054 2055 if (TagDecl) 2056 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2057 return; 2058 } 2059 } 2060 2061 assert(Tok.is(tok::l_brace)); 2062 2063 SourceLocation LBraceLoc = ConsumeBrace(); 2064 2065 if (TagDecl) 2066 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2067 LBraceLoc); 2068 2069 // C++ 11p3: Members of a class defined with the keyword class are private 2070 // by default. Members of a class defined with the keywords struct or union 2071 // are public by default. 2072 AccessSpecifier CurAS; 2073 if (TagType == DeclSpec::TST_class) 2074 CurAS = AS_private; 2075 else 2076 CurAS = AS_public; 2077 2078 SourceLocation RBraceLoc; 2079 if (TagDecl) { 2080 // While we still have something to read, read the member-declarations. 2081 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2082 // Each iteration of this loop reads one member-declaration. 2083 2084 if (getLang().Microsoft && (Tok.is(tok::kw___if_exists) || 2085 Tok.is(tok::kw___if_not_exists))) { 2086 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2087 continue; 2088 } 2089 2090 // Check for extraneous top-level semicolon. 2091 if (Tok.is(tok::semi)) { 2092 Diag(Tok, diag::ext_extra_struct_semi) 2093 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2094 << FixItHint::CreateRemoval(Tok.getLocation()); 2095 ConsumeToken(); 2096 continue; 2097 } 2098 2099 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2100 if (AS != AS_none) { 2101 // Current token is a C++ access specifier. 2102 CurAS = AS; 2103 SourceLocation ASLoc = Tok.getLocation(); 2104 ConsumeToken(); 2105 if (Tok.is(tok::colon)) 2106 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2107 else 2108 Diag(Tok, diag::err_expected_colon); 2109 ConsumeToken(); 2110 continue; 2111 } 2112 2113 // FIXME: Make sure we don't have a template here. 2114 2115 // Parse all the comma separated declarators. 2116 ParseCXXClassMemberDeclaration(CurAS); 2117 } 2118 2119 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 2120 } else { 2121 SkipUntil(tok::r_brace, false, false); 2122 } 2123 2124 // If attributes exist after class contents, parse them. 2125 ParsedAttributes attrs(AttrFactory); 2126 MaybeParseGNUAttributes(attrs); 2127 2128 if (TagDecl) 2129 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2130 LBraceLoc, RBraceLoc, 2131 attrs.getList()); 2132 2133 // C++0x [class.mem]p2: Within the class member-specification, the class is 2134 // regarded as complete within function bodies, default arguments, exception- 2135 // specifications, and brace-or-equal-initializers for non-static data 2136 // members (including such things in nested classes). 2137 // 2138 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2139 // handled. Fix the others! 2140 if (TagDecl && NonNestedClass) { 2141 // We are not inside a nested class. This class and its nested classes 2142 // are complete and we can parse the delayed portions of method 2143 // declarations and the lexed inline method definitions. 2144 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2145 ParseLexedMethodDeclarations(getCurrentClass()); 2146 ParseLexedMemberInitializers(getCurrentClass()); 2147 ParseLexedMethodDefs(getCurrentClass()); 2148 PrevTokLocation = SavedPrevTokLocation; 2149 } 2150 2151 if (TagDecl) 2152 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 2153 2154 // Leave the class scope. 2155 ParsingDef.Pop(); 2156 ClassScope.Exit(); 2157} 2158 2159/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2160/// which explicitly initializes the members or base classes of a 2161/// class (C++ [class.base.init]). For example, the three initializers 2162/// after the ':' in the Derived constructor below: 2163/// 2164/// @code 2165/// class Base { }; 2166/// class Derived : Base { 2167/// int x; 2168/// float f; 2169/// public: 2170/// Derived(float f) : Base(), x(17), f(f) { } 2171/// }; 2172/// @endcode 2173/// 2174/// [C++] ctor-initializer: 2175/// ':' mem-initializer-list 2176/// 2177/// [C++] mem-initializer-list: 2178/// mem-initializer ...[opt] 2179/// mem-initializer ...[opt] , mem-initializer-list 2180void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2181 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2182 2183 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2184 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2185 SourceLocation ColonLoc = ConsumeToken(); 2186 2187 llvm::SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2188 bool AnyErrors = false; 2189 2190 do { 2191 if (Tok.is(tok::code_completion)) { 2192 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2193 MemInitializers.data(), 2194 MemInitializers.size()); 2195 ConsumeCodeCompletionToken(); 2196 } else { 2197 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2198 if (!MemInit.isInvalid()) 2199 MemInitializers.push_back(MemInit.get()); 2200 else 2201 AnyErrors = true; 2202 } 2203 2204 if (Tok.is(tok::comma)) 2205 ConsumeToken(); 2206 else if (Tok.is(tok::l_brace)) 2207 break; 2208 // If the next token looks like a base or member initializer, assume that 2209 // we're just missing a comma. 2210 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2211 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2212 Diag(Loc, diag::err_ctor_init_missing_comma) 2213 << FixItHint::CreateInsertion(Loc, ", "); 2214 } else { 2215 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2216 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2217 SkipUntil(tok::l_brace, true, true); 2218 break; 2219 } 2220 } while (true); 2221 2222 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2223 MemInitializers.data(), MemInitializers.size(), 2224 AnyErrors); 2225} 2226 2227/// ParseMemInitializer - Parse a C++ member initializer, which is 2228/// part of a constructor initializer that explicitly initializes one 2229/// member or base class (C++ [class.base.init]). See 2230/// ParseConstructorInitializer for an example. 2231/// 2232/// [C++] mem-initializer: 2233/// mem-initializer-id '(' expression-list[opt] ')' 2234/// [C++0x] mem-initializer-id braced-init-list 2235/// 2236/// [C++] mem-initializer-id: 2237/// '::'[opt] nested-name-specifier[opt] class-name 2238/// identifier 2239Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2240 // parse '::'[opt] nested-name-specifier[opt] 2241 CXXScopeSpec SS; 2242 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2243 ParsedType TemplateTypeTy; 2244 if (Tok.is(tok::annot_template_id)) { 2245 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2246 if (TemplateId->Kind == TNK_Type_template || 2247 TemplateId->Kind == TNK_Dependent_template_name) { 2248 AnnotateTemplateIdTokenAsType(); 2249 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2250 TemplateTypeTy = getTypeAnnotation(Tok); 2251 } 2252 } 2253 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2254 Diag(Tok, diag::err_expected_member_or_base_name); 2255 return true; 2256 } 2257 2258 // Get the identifier. This may be a member name or a class name, 2259 // but we'll let the semantic analysis determine which it is. 2260 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2261 SourceLocation IdLoc = ConsumeToken(); 2262 2263 // Parse the '('. 2264 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2265 // FIXME: Do something with the braced-init-list. 2266 ParseBraceInitializer(); 2267 return true; 2268 } else if(Tok.is(tok::l_paren)) { 2269 SourceLocation LParenLoc = ConsumeParen(); 2270 2271 // Parse the optional expression-list. 2272 ExprVector ArgExprs(Actions); 2273 CommaLocsTy CommaLocs; 2274 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2275 SkipUntil(tok::r_paren); 2276 return true; 2277 } 2278 2279 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2280 2281 SourceLocation EllipsisLoc; 2282 if (Tok.is(tok::ellipsis)) 2283 EllipsisLoc = ConsumeToken(); 2284 2285 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2286 TemplateTypeTy, IdLoc, 2287 LParenLoc, ArgExprs.take(), 2288 ArgExprs.size(), RParenLoc, 2289 EllipsisLoc); 2290 } 2291 2292 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2293 : diag::err_expected_lparen); 2294 return true; 2295} 2296 2297/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2298/// 2299/// exception-specification: 2300/// dynamic-exception-specification 2301/// noexcept-specification 2302/// 2303/// noexcept-specification: 2304/// 'noexcept' 2305/// 'noexcept' '(' constant-expression ')' 2306ExceptionSpecificationType 2307Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2308 llvm::SmallVectorImpl<ParsedType> &DynamicExceptions, 2309 llvm::SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2310 ExprResult &NoexceptExpr) { 2311 ExceptionSpecificationType Result = EST_None; 2312 2313 // See if there's a dynamic specification. 2314 if (Tok.is(tok::kw_throw)) { 2315 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2316 DynamicExceptions, 2317 DynamicExceptionRanges); 2318 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2319 "Produced different number of exception types and ranges."); 2320 } 2321 2322 // If there's no noexcept specification, we're done. 2323 if (Tok.isNot(tok::kw_noexcept)) 2324 return Result; 2325 2326 // If we already had a dynamic specification, parse the noexcept for, 2327 // recovery, but emit a diagnostic and don't store the results. 2328 SourceRange NoexceptRange; 2329 ExceptionSpecificationType NoexceptType = EST_None; 2330 2331 SourceLocation KeywordLoc = ConsumeToken(); 2332 if (Tok.is(tok::l_paren)) { 2333 // There is an argument. 2334 SourceLocation LParenLoc = ConsumeParen(); 2335 NoexceptType = EST_ComputedNoexcept; 2336 NoexceptExpr = ParseConstantExpression(); 2337 // The argument must be contextually convertible to bool. We use 2338 // ActOnBooleanCondition for this purpose. 2339 if (!NoexceptExpr.isInvalid()) 2340 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2341 NoexceptExpr.get()); 2342 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2343 NoexceptRange = SourceRange(KeywordLoc, RParenLoc); 2344 } else { 2345 // There is no argument. 2346 NoexceptType = EST_BasicNoexcept; 2347 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2348 } 2349 2350 if (Result == EST_None) { 2351 SpecificationRange = NoexceptRange; 2352 Result = NoexceptType; 2353 2354 // If there's a dynamic specification after a noexcept specification, 2355 // parse that and ignore the results. 2356 if (Tok.is(tok::kw_throw)) { 2357 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2358 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2359 DynamicExceptionRanges); 2360 } 2361 } else { 2362 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2363 } 2364 2365 return Result; 2366} 2367 2368/// ParseDynamicExceptionSpecification - Parse a C++ 2369/// dynamic-exception-specification (C++ [except.spec]). 2370/// 2371/// dynamic-exception-specification: 2372/// 'throw' '(' type-id-list [opt] ')' 2373/// [MS] 'throw' '(' '...' ')' 2374/// 2375/// type-id-list: 2376/// type-id ... [opt] 2377/// type-id-list ',' type-id ... [opt] 2378/// 2379ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2380 SourceRange &SpecificationRange, 2381 llvm::SmallVectorImpl<ParsedType> &Exceptions, 2382 llvm::SmallVectorImpl<SourceRange> &Ranges) { 2383 assert(Tok.is(tok::kw_throw) && "expected throw"); 2384 2385 SpecificationRange.setBegin(ConsumeToken()); 2386 2387 if (!Tok.is(tok::l_paren)) { 2388 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2389 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2390 return EST_DynamicNone; 2391 } 2392 SourceLocation LParenLoc = ConsumeParen(); 2393 2394 // Parse throw(...), a Microsoft extension that means "this function 2395 // can throw anything". 2396 if (Tok.is(tok::ellipsis)) { 2397 SourceLocation EllipsisLoc = ConsumeToken(); 2398 if (!getLang().Microsoft) 2399 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2400 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2401 SpecificationRange.setEnd(RParenLoc); 2402 return EST_MSAny; 2403 } 2404 2405 // Parse the sequence of type-ids. 2406 SourceRange Range; 2407 while (Tok.isNot(tok::r_paren)) { 2408 TypeResult Res(ParseTypeName(&Range)); 2409 2410 if (Tok.is(tok::ellipsis)) { 2411 // C++0x [temp.variadic]p5: 2412 // - In a dynamic-exception-specification (15.4); the pattern is a 2413 // type-id. 2414 SourceLocation Ellipsis = ConsumeToken(); 2415 Range.setEnd(Ellipsis); 2416 if (!Res.isInvalid()) 2417 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2418 } 2419 2420 if (!Res.isInvalid()) { 2421 Exceptions.push_back(Res.get()); 2422 Ranges.push_back(Range); 2423 } 2424 2425 if (Tok.is(tok::comma)) 2426 ConsumeToken(); 2427 else 2428 break; 2429 } 2430 2431 SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc)); 2432 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2433} 2434 2435/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2436/// function declaration. 2437TypeResult Parser::ParseTrailingReturnType() { 2438 assert(Tok.is(tok::arrow) && "expected arrow"); 2439 2440 ConsumeToken(); 2441 2442 // FIXME: Need to suppress declarations when parsing this typename. 2443 // Otherwise in this function definition: 2444 // 2445 // auto f() -> struct X {} 2446 // 2447 // struct X is parsed as class definition because of the trailing 2448 // brace. 2449 2450 SourceRange Range; 2451 return ParseTypeName(&Range); 2452} 2453 2454/// \brief We have just started parsing the definition of a new class, 2455/// so push that class onto our stack of classes that is currently 2456/// being parsed. 2457Sema::ParsingClassState 2458Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2459 assert((NonNestedClass || !ClassStack.empty()) && 2460 "Nested class without outer class"); 2461 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2462 return Actions.PushParsingClass(); 2463} 2464 2465/// \brief Deallocate the given parsed class and all of its nested 2466/// classes. 2467void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2468 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2469 delete Class->LateParsedDeclarations[I]; 2470 delete Class; 2471} 2472 2473/// \brief Pop the top class of the stack of classes that are 2474/// currently being parsed. 2475/// 2476/// This routine should be called when we have finished parsing the 2477/// definition of a class, but have not yet popped the Scope 2478/// associated with the class's definition. 2479/// 2480/// \returns true if the class we've popped is a top-level class, 2481/// false otherwise. 2482void Parser::PopParsingClass(Sema::ParsingClassState state) { 2483 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2484 2485 Actions.PopParsingClass(state); 2486 2487 ParsingClass *Victim = ClassStack.top(); 2488 ClassStack.pop(); 2489 if (Victim->TopLevelClass) { 2490 // Deallocate all of the nested classes of this class, 2491 // recursively: we don't need to keep any of this information. 2492 DeallocateParsedClasses(Victim); 2493 return; 2494 } 2495 assert(!ClassStack.empty() && "Missing top-level class?"); 2496 2497 if (Victim->LateParsedDeclarations.empty()) { 2498 // The victim is a nested class, but we will not need to perform 2499 // any processing after the definition of this class since it has 2500 // no members whose handling was delayed. Therefore, we can just 2501 // remove this nested class. 2502 DeallocateParsedClasses(Victim); 2503 return; 2504 } 2505 2506 // This nested class has some members that will need to be processed 2507 // after the top-level class is completely defined. Therefore, add 2508 // it to the list of nested classes within its parent. 2509 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2510 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2511 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2512} 2513 2514/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2515/// parses standard attributes. 2516/// 2517/// [C++0x] attribute-specifier: 2518/// '[' '[' attribute-list ']' ']' 2519/// 2520/// [C++0x] attribute-list: 2521/// attribute[opt] 2522/// attribute-list ',' attribute[opt] 2523/// 2524/// [C++0x] attribute: 2525/// attribute-token attribute-argument-clause[opt] 2526/// 2527/// [C++0x] attribute-token: 2528/// identifier 2529/// attribute-scoped-token 2530/// 2531/// [C++0x] attribute-scoped-token: 2532/// attribute-namespace '::' identifier 2533/// 2534/// [C++0x] attribute-namespace: 2535/// identifier 2536/// 2537/// [C++0x] attribute-argument-clause: 2538/// '(' balanced-token-seq ')' 2539/// 2540/// [C++0x] balanced-token-seq: 2541/// balanced-token 2542/// balanced-token-seq balanced-token 2543/// 2544/// [C++0x] balanced-token: 2545/// '(' balanced-token-seq ')' 2546/// '[' balanced-token-seq ']' 2547/// '{' balanced-token-seq '}' 2548/// any token but '(', ')', '[', ']', '{', or '}' 2549void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2550 SourceLocation *endLoc) { 2551 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2552 && "Not a C++0x attribute list"); 2553 2554 SourceLocation StartLoc = Tok.getLocation(), Loc; 2555 2556 ConsumeBracket(); 2557 ConsumeBracket(); 2558 2559 if (Tok.is(tok::comma)) { 2560 Diag(Tok.getLocation(), diag::err_expected_ident); 2561 ConsumeToken(); 2562 } 2563 2564 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2565 // attribute not present 2566 if (Tok.is(tok::comma)) { 2567 ConsumeToken(); 2568 continue; 2569 } 2570 2571 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2572 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2573 2574 // scoped attribute 2575 if (Tok.is(tok::coloncolon)) { 2576 ConsumeToken(); 2577 2578 if (!Tok.is(tok::identifier)) { 2579 Diag(Tok.getLocation(), diag::err_expected_ident); 2580 SkipUntil(tok::r_square, tok::comma, true, true); 2581 continue; 2582 } 2583 2584 ScopeName = AttrName; 2585 ScopeLoc = AttrLoc; 2586 2587 AttrName = Tok.getIdentifierInfo(); 2588 AttrLoc = ConsumeToken(); 2589 } 2590 2591 bool AttrParsed = false; 2592 // No scoped names are supported; ideally we could put all non-standard 2593 // attributes into namespaces. 2594 if (!ScopeName) { 2595 switch(AttributeList::getKind(AttrName)) 2596 { 2597 // No arguments 2598 case AttributeList::AT_carries_dependency: 2599 case AttributeList::AT_noreturn: { 2600 if (Tok.is(tok::l_paren)) { 2601 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2602 << AttrName->getName(); 2603 break; 2604 } 2605 2606 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2607 SourceLocation(), 0, 0, false, true); 2608 AttrParsed = true; 2609 break; 2610 } 2611 2612 // One argument; must be a type-id or assignment-expression 2613 case AttributeList::AT_aligned: { 2614 if (Tok.isNot(tok::l_paren)) { 2615 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2616 << AttrName->getName(); 2617 break; 2618 } 2619 SourceLocation ParamLoc = ConsumeParen(); 2620 2621 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2622 2623 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2624 2625 ExprVector ArgExprs(Actions); 2626 ArgExprs.push_back(ArgExpr.release()); 2627 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 2628 0, ParamLoc, ArgExprs.take(), 1, 2629 false, true); 2630 2631 AttrParsed = true; 2632 break; 2633 } 2634 2635 // Silence warnings 2636 default: break; 2637 } 2638 } 2639 2640 // Skip the entire parameter clause, if any 2641 if (!AttrParsed && Tok.is(tok::l_paren)) { 2642 ConsumeParen(); 2643 // SkipUntil maintains the balancedness of tokens. 2644 SkipUntil(tok::r_paren, false); 2645 } 2646 } 2647 2648 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2649 SkipUntil(tok::r_square, false); 2650 Loc = Tok.getLocation(); 2651 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2652 SkipUntil(tok::r_square, false); 2653 2654 attrs.Range = SourceRange(StartLoc, Loc); 2655} 2656 2657/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2658/// attribute. 2659/// 2660/// FIXME: Simply returns an alignof() expression if the argument is a 2661/// type. Ideally, the type should be propagated directly into Sema. 2662/// 2663/// [C++0x] 'align' '(' type-id ')' 2664/// [C++0x] 'align' '(' assignment-expression ')' 2665ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2666 if (isTypeIdInParens()) { 2667 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2668 SourceLocation TypeLoc = Tok.getLocation(); 2669 ParsedType Ty = ParseTypeName().get(); 2670 SourceRange TypeRange(Start, Tok.getLocation()); 2671 return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true, 2672 Ty.getAsOpaquePtr(), TypeRange); 2673 } else 2674 return ParseConstantExpression(); 2675} 2676 2677/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2678/// 2679/// [MS] ms-attribute: 2680/// '[' token-seq ']' 2681/// 2682/// [MS] ms-attribute-seq: 2683/// ms-attribute[opt] 2684/// ms-attribute ms-attribute-seq 2685void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2686 SourceLocation *endLoc) { 2687 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2688 2689 while (Tok.is(tok::l_square)) { 2690 ConsumeBracket(); 2691 SkipUntil(tok::r_square, true, true); 2692 if (endLoc) *endLoc = Tok.getLocation(); 2693 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2694 } 2695} 2696 2697void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2698 AccessSpecifier& CurAS) { 2699 bool Result; 2700 if (ParseMicrosoftIfExistsCondition(Result)) 2701 return; 2702 2703 if (Tok.isNot(tok::l_brace)) { 2704 Diag(Tok, diag::err_expected_lbrace); 2705 return; 2706 } 2707 ConsumeBrace(); 2708 2709 // Condition is false skip all inside the {}. 2710 if (!Result) { 2711 SkipUntil(tok::r_brace, false); 2712 return; 2713 } 2714 2715 // Condition is true, parse the declaration. 2716 while (Tok.isNot(tok::r_brace)) { 2717 2718 // __if_exists, __if_not_exists can nest. 2719 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2720 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2721 continue; 2722 } 2723 2724 // Check for extraneous top-level semicolon. 2725 if (Tok.is(tok::semi)) { 2726 Diag(Tok, diag::ext_extra_struct_semi) 2727 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2728 << FixItHint::CreateRemoval(Tok.getLocation()); 2729 ConsumeToken(); 2730 continue; 2731 } 2732 2733 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2734 if (AS != AS_none) { 2735 // Current token is a C++ access specifier. 2736 CurAS = AS; 2737 SourceLocation ASLoc = Tok.getLocation(); 2738 ConsumeToken(); 2739 if (Tok.is(tok::colon)) 2740 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2741 else 2742 Diag(Tok, diag::err_expected_colon); 2743 ConsumeToken(); 2744 continue; 2745 } 2746 2747 // Parse all the comma separated declarators. 2748 ParseCXXClassMemberDeclaration(CurAS); 2749 } 2750 2751 if (Tok.isNot(tok::r_brace)) { 2752 Diag(Tok, diag::err_expected_rbrace); 2753 return; 2754 } 2755 ConsumeBrace(); 2756} 2757