ParseDeclCXX.cpp revision 688761409155b47c39eb5dae1b8c6c8a9f43307a
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 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 Decl **OwnedType) { 319 assert(Tok.is(tok::kw_using) && "Not using token"); 320 321 // Eat 'using'. 322 SourceLocation UsingLoc = ConsumeToken(); 323 324 if (Tok.is(tok::code_completion)) { 325 Actions.CodeCompleteUsing(getCurScope()); 326 ConsumeCodeCompletionToken(); 327 } 328 329 // 'using namespace' means this is a using-directive. 330 if (Tok.is(tok::kw_namespace)) { 331 // Template parameters are always an error here. 332 if (TemplateInfo.Kind) { 333 SourceRange R = TemplateInfo.getSourceRange(); 334 Diag(UsingLoc, diag::err_templated_using_directive) 335 << R << FixItHint::CreateRemoval(R); 336 } 337 338 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 339 } 340 341 // Otherwise, it must be a using-declaration or an alias-declaration. 342 343 // Using declarations can't have attributes. 344 ProhibitAttributes(attrs); 345 346 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 347 AS_none, OwnedType); 348} 349 350/// ParseUsingDirective - Parse C++ using-directive, assumes 351/// that current token is 'namespace' and 'using' was already parsed. 352/// 353/// using-directive: [C++ 7.3.p4: namespace.udir] 354/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 355/// namespace-name ; 356/// [GNU] using-directive: 357/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 358/// namespace-name attributes[opt] ; 359/// 360Decl *Parser::ParseUsingDirective(unsigned Context, 361 SourceLocation UsingLoc, 362 SourceLocation &DeclEnd, 363 ParsedAttributes &attrs) { 364 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 365 366 // Eat 'namespace'. 367 SourceLocation NamespcLoc = ConsumeToken(); 368 369 if (Tok.is(tok::code_completion)) { 370 Actions.CodeCompleteUsingDirective(getCurScope()); 371 ConsumeCodeCompletionToken(); 372 } 373 374 CXXScopeSpec SS; 375 // Parse (optional) nested-name-specifier. 376 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 377 378 IdentifierInfo *NamespcName = 0; 379 SourceLocation IdentLoc = SourceLocation(); 380 381 // Parse namespace-name. 382 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 383 Diag(Tok, diag::err_expected_namespace_name); 384 // If there was invalid namespace name, skip to end of decl, and eat ';'. 385 SkipUntil(tok::semi); 386 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 387 return 0; 388 } 389 390 // Parse identifier. 391 NamespcName = Tok.getIdentifierInfo(); 392 IdentLoc = ConsumeToken(); 393 394 // Parse (optional) attributes (most likely GNU strong-using extension). 395 bool GNUAttr = false; 396 if (Tok.is(tok::kw___attribute)) { 397 GNUAttr = true; 398 ParseGNUAttributes(attrs); 399 } 400 401 // Eat ';'. 402 DeclEnd = Tok.getLocation(); 403 ExpectAndConsume(tok::semi, 404 GNUAttr ? diag::err_expected_semi_after_attribute_list 405 : diag::err_expected_semi_after_namespace_name, 406 "", tok::semi); 407 408 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 409 IdentLoc, NamespcName, attrs.getList()); 410} 411 412/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 413/// Assumes that 'using' was already seen. 414/// 415/// using-declaration: [C++ 7.3.p3: namespace.udecl] 416/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 417/// unqualified-id 418/// 'using' :: unqualified-id 419/// 420/// alias-declaration: C++0x [decl.typedef]p2 421/// 'using' identifier = type-id ; 422/// 423Decl *Parser::ParseUsingDeclaration(unsigned Context, 424 const ParsedTemplateInfo &TemplateInfo, 425 SourceLocation UsingLoc, 426 SourceLocation &DeclEnd, 427 AccessSpecifier AS, 428 Decl **OwnedType) { 429 CXXScopeSpec SS; 430 SourceLocation TypenameLoc; 431 bool IsTypeName; 432 433 // Ignore optional 'typename'. 434 // FIXME: This is wrong; we should parse this as a typename-specifier. 435 if (Tok.is(tok::kw_typename)) { 436 TypenameLoc = Tok.getLocation(); 437 ConsumeToken(); 438 IsTypeName = true; 439 } 440 else 441 IsTypeName = false; 442 443 // Parse nested-name-specifier. 444 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 445 446 // Check nested-name specifier. 447 if (SS.isInvalid()) { 448 SkipUntil(tok::semi); 449 return 0; 450 } 451 452 // Parse the unqualified-id. We allow parsing of both constructor and 453 // destructor names and allow the action module to diagnose any semantic 454 // errors. 455 UnqualifiedId Name; 456 if (ParseUnqualifiedId(SS, 457 /*EnteringContext=*/false, 458 /*AllowDestructorName=*/true, 459 /*AllowConstructorName=*/true, 460 ParsedType(), 461 Name)) { 462 SkipUntil(tok::semi); 463 return 0; 464 } 465 466 ParsedAttributes attrs(AttrFactory); 467 468 // Maybe this is an alias-declaration. 469 bool IsAliasDecl = Tok.is(tok::equal); 470 TypeResult TypeAlias; 471 if (IsAliasDecl) { 472 // TODO: Attribute support. C++0x attributes may appear before the equals. 473 // Where can GNU attributes appear? 474 ConsumeToken(); 475 476 if (!getLang().CPlusPlus0x) 477 Diag(Tok.getLocation(), diag::ext_alias_declaration); 478 479 // Type alias templates cannot be specialized. 480 int SpecKind = -1; 481 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 482 Name.getKind() == UnqualifiedId::IK_TemplateId) 483 SpecKind = 0; 484 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 485 SpecKind = 1; 486 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 487 SpecKind = 2; 488 if (SpecKind != -1) { 489 SourceRange Range; 490 if (SpecKind == 0) 491 Range = SourceRange(Name.TemplateId->LAngleLoc, 492 Name.TemplateId->RAngleLoc); 493 else 494 Range = TemplateInfo.getSourceRange(); 495 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 496 << SpecKind << Range; 497 SkipUntil(tok::semi); 498 return 0; 499 } 500 501 // Name must be an identifier. 502 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 503 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 504 // No removal fixit: can't recover from this. 505 SkipUntil(tok::semi); 506 return 0; 507 } else if (IsTypeName) 508 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 509 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 510 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 511 else if (SS.isNotEmpty()) 512 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 513 << FixItHint::CreateRemoval(SS.getRange()); 514 515 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 516 Declarator::AliasTemplateContext : 517 Declarator::AliasDeclContext, 0, AS, OwnedType); 518 } else 519 // Parse (optional) attributes (most likely GNU strong-using extension). 520 MaybeParseGNUAttributes(attrs); 521 522 // Eat ';'. 523 DeclEnd = Tok.getLocation(); 524 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 525 !attrs.empty() ? "attributes list" : 526 IsAliasDecl ? "alias declaration" : "using declaration", 527 tok::semi); 528 529 // Diagnose an attempt to declare a templated using-declaration. 530 // In C++0x, alias-declarations can be templates: 531 // template <...> using id = type; 532 if (TemplateInfo.Kind && !IsAliasDecl) { 533 SourceRange R = TemplateInfo.getSourceRange(); 534 Diag(UsingLoc, diag::err_templated_using_declaration) 535 << R << FixItHint::CreateRemoval(R); 536 537 // Unfortunately, we have to bail out instead of recovering by 538 // ignoring the parameters, just in case the nested name specifier 539 // depends on the parameters. 540 return 0; 541 } 542 543 if (IsAliasDecl) { 544 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 545 MultiTemplateParamsArg TemplateParamsArg(Actions, 546 TemplateParams ? TemplateParams->data() : 0, 547 TemplateParams ? TemplateParams->size() : 0); 548 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 549 UsingLoc, Name, TypeAlias); 550 } 551 552 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 553 Name, attrs.getList(), 554 IsTypeName, TypenameLoc); 555} 556 557/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 558/// 559/// [C++0x] static_assert-declaration: 560/// static_assert ( constant-expression , string-literal ) ; 561/// 562/// [C1X] static_assert-declaration: 563/// _Static_assert ( constant-expression , string-literal ) ; 564/// 565Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 566 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 567 "Not a static_assert declaration"); 568 569 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 570 Diag(Tok, diag::ext_c1x_static_assert); 571 572 SourceLocation StaticAssertLoc = ConsumeToken(); 573 574 if (Tok.isNot(tok::l_paren)) { 575 Diag(Tok, diag::err_expected_lparen); 576 return 0; 577 } 578 579 SourceLocation LParenLoc = ConsumeParen(); 580 581 ExprResult AssertExpr(ParseConstantExpression()); 582 if (AssertExpr.isInvalid()) { 583 SkipUntil(tok::semi); 584 return 0; 585 } 586 587 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 588 return 0; 589 590 if (Tok.isNot(tok::string_literal)) { 591 Diag(Tok, diag::err_expected_string_literal); 592 SkipUntil(tok::semi); 593 return 0; 594 } 595 596 ExprResult AssertMessage(ParseStringLiteralExpression()); 597 if (AssertMessage.isInvalid()) 598 return 0; 599 600 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 601 602 DeclEnd = Tok.getLocation(); 603 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 604 605 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 606 AssertExpr.take(), 607 AssertMessage.take(), 608 RParenLoc); 609} 610 611/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 612/// 613/// 'decltype' ( expression ) 614/// 615void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 616 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 617 618 SourceLocation StartLoc = ConsumeToken(); 619 SourceLocation LParenLoc = Tok.getLocation(); 620 621 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 622 "decltype")) { 623 SkipUntil(tok::r_paren); 624 return; 625 } 626 627 // Parse the expression 628 629 // C++0x [dcl.type.simple]p4: 630 // The operand of the decltype specifier is an unevaluated operand. 631 EnterExpressionEvaluationContext Unevaluated(Actions, 632 Sema::Unevaluated); 633 ExprResult Result = ParseExpression(); 634 if (Result.isInvalid()) { 635 SkipUntil(tok::r_paren); 636 return; 637 } 638 639 // Match the ')' 640 SourceLocation RParenLoc; 641 if (Tok.is(tok::r_paren)) 642 RParenLoc = ConsumeParen(); 643 else 644 MatchRHSPunctuation(tok::r_paren, LParenLoc); 645 646 if (RParenLoc.isInvalid()) 647 return; 648 649 const char *PrevSpec = 0; 650 unsigned DiagID; 651 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 652 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 653 DiagID, Result.release())) 654 Diag(StartLoc, DiagID) << PrevSpec; 655} 656 657void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 658 assert(Tok.is(tok::kw___underlying_type) && 659 "Not an underlying type specifier"); 660 661 SourceLocation StartLoc = ConsumeToken(); 662 SourceLocation LParenLoc = Tok.getLocation(); 663 664 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 665 "__underlying_type")) { 666 SkipUntil(tok::r_paren); 667 return; 668 } 669 670 TypeResult Result = ParseTypeName(); 671 if (Result.isInvalid()) { 672 SkipUntil(tok::r_paren); 673 return; 674 } 675 676 // Match the ')' 677 SourceLocation RParenLoc; 678 if (Tok.is(tok::r_paren)) 679 RParenLoc = ConsumeParen(); 680 else 681 MatchRHSPunctuation(tok::r_paren, LParenLoc); 682 683 if (RParenLoc.isInvalid()) 684 return; 685 686 const char *PrevSpec = 0; 687 unsigned DiagID; 688 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 689 DiagID, Result.release())) 690 Diag(StartLoc, DiagID) << PrevSpec; 691} 692 693/// ParseClassName - Parse a C++ class-name, which names a class. Note 694/// that we only check that the result names a type; semantic analysis 695/// will need to verify that the type names a class. The result is 696/// either a type or NULL, depending on whether a type name was 697/// found. 698/// 699/// class-name: [C++ 9.1] 700/// identifier 701/// simple-template-id 702/// 703Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 704 CXXScopeSpec &SS) { 705 // Check whether we have a template-id that names a type. 706 if (Tok.is(tok::annot_template_id)) { 707 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 708 if (TemplateId->Kind == TNK_Type_template || 709 TemplateId->Kind == TNK_Dependent_template_name) { 710 AnnotateTemplateIdTokenAsType(); 711 712 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 713 ParsedType Type = getTypeAnnotation(Tok); 714 EndLocation = Tok.getAnnotationEndLoc(); 715 ConsumeToken(); 716 717 if (Type) 718 return Type; 719 return true; 720 } 721 722 // Fall through to produce an error below. 723 } 724 725 if (Tok.isNot(tok::identifier)) { 726 Diag(Tok, diag::err_expected_class_name); 727 return true; 728 } 729 730 IdentifierInfo *Id = Tok.getIdentifierInfo(); 731 SourceLocation IdLoc = ConsumeToken(); 732 733 if (Tok.is(tok::less)) { 734 // It looks the user intended to write a template-id here, but the 735 // template-name was wrong. Try to fix that. 736 TemplateNameKind TNK = TNK_Type_template; 737 TemplateTy Template; 738 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 739 &SS, Template, TNK)) { 740 Diag(IdLoc, diag::err_unknown_template_name) 741 << Id; 742 } 743 744 if (!Template) 745 return true; 746 747 // Form the template name 748 UnqualifiedId TemplateName; 749 TemplateName.setIdentifier(Id, IdLoc); 750 751 // Parse the full template-id, then turn it into a type. 752 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 753 SourceLocation(), true)) 754 return true; 755 if (TNK == TNK_Dependent_template_name) 756 AnnotateTemplateIdTokenAsType(); 757 758 // If we didn't end up with a typename token, there's nothing more we 759 // can do. 760 if (Tok.isNot(tok::annot_typename)) 761 return true; 762 763 // Retrieve the type from the annotation token, consume that token, and 764 // return. 765 EndLocation = Tok.getAnnotationEndLoc(); 766 ParsedType Type = getTypeAnnotation(Tok); 767 ConsumeToken(); 768 return Type; 769 } 770 771 // We have an identifier; check whether it is actually a type. 772 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 773 false, ParsedType(), 774 /*NonTrivialTypeSourceInfo=*/true); 775 if (!Type) { 776 Diag(IdLoc, diag::err_expected_class_name); 777 return true; 778 } 779 780 // Consume the identifier. 781 EndLocation = IdLoc; 782 783 // Fake up a Declarator to use with ActOnTypeName. 784 DeclSpec DS(AttrFactory); 785 DS.SetRangeStart(IdLoc); 786 DS.SetRangeEnd(EndLocation); 787 DS.getTypeSpecScope() = SS; 788 789 const char *PrevSpec = 0; 790 unsigned DiagID; 791 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 792 793 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 794 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 795} 796 797/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 798/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 799/// until we reach the start of a definition or see a token that 800/// cannot start a definition. If SuppressDeclarations is true, we do know. 801/// 802/// class-specifier: [C++ class] 803/// class-head '{' member-specification[opt] '}' 804/// class-head '{' member-specification[opt] '}' attributes[opt] 805/// class-head: 806/// class-key identifier[opt] base-clause[opt] 807/// class-key nested-name-specifier identifier base-clause[opt] 808/// class-key nested-name-specifier[opt] simple-template-id 809/// base-clause[opt] 810/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 811/// [GNU] class-key attributes[opt] nested-name-specifier 812/// identifier base-clause[opt] 813/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 814/// simple-template-id base-clause[opt] 815/// class-key: 816/// 'class' 817/// 'struct' 818/// 'union' 819/// 820/// elaborated-type-specifier: [C++ dcl.type.elab] 821/// class-key ::[opt] nested-name-specifier[opt] identifier 822/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 823/// simple-template-id 824/// 825/// Note that the C++ class-specifier and elaborated-type-specifier, 826/// together, subsume the C99 struct-or-union-specifier: 827/// 828/// struct-or-union-specifier: [C99 6.7.2.1] 829/// struct-or-union identifier[opt] '{' struct-contents '}' 830/// struct-or-union identifier 831/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 832/// '}' attributes[opt] 833/// [GNU] struct-or-union attributes[opt] identifier 834/// struct-or-union: 835/// 'struct' 836/// 'union' 837void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 838 SourceLocation StartLoc, DeclSpec &DS, 839 const ParsedTemplateInfo &TemplateInfo, 840 AccessSpecifier AS, bool SuppressDeclarations){ 841 DeclSpec::TST TagType; 842 if (TagTokKind == tok::kw_struct) 843 TagType = DeclSpec::TST_struct; 844 else if (TagTokKind == tok::kw_class) 845 TagType = DeclSpec::TST_class; 846 else { 847 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 848 TagType = DeclSpec::TST_union; 849 } 850 851 if (Tok.is(tok::code_completion)) { 852 // Code completion for a struct, class, or union name. 853 Actions.CodeCompleteTag(getCurScope(), TagType); 854 ConsumeCodeCompletionToken(); 855 } 856 857 // C++03 [temp.explicit] 14.7.2/8: 858 // The usual access checking rules do not apply to names used to specify 859 // explicit instantiations. 860 // 861 // As an extension we do not perform access checking on the names used to 862 // specify explicit specializations either. This is important to allow 863 // specializing traits classes for private types. 864 bool SuppressingAccessChecks = false; 865 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 866 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 867 Actions.ActOnStartSuppressingAccessChecks(); 868 SuppressingAccessChecks = true; 869 } 870 871 ParsedAttributes attrs(AttrFactory); 872 // If attributes exist after tag, parse them. 873 if (Tok.is(tok::kw___attribute)) 874 ParseGNUAttributes(attrs); 875 876 // If declspecs exist after tag, parse them. 877 while (Tok.is(tok::kw___declspec)) 878 ParseMicrosoftDeclSpec(attrs); 879 880 // If C++0x attributes exist here, parse them. 881 // FIXME: Are we consistent with the ordering of parsing of different 882 // styles of attributes? 883 MaybeParseCXX0XAttributes(attrs); 884 885 if (TagType == DeclSpec::TST_struct && 886 !Tok.is(tok::identifier) && 887 Tok.getIdentifierInfo() && 888 (Tok.is(tok::kw___is_arithmetic) || 889 Tok.is(tok::kw___is_convertible) || 890 Tok.is(tok::kw___is_empty) || 891 Tok.is(tok::kw___is_floating_point) || 892 Tok.is(tok::kw___is_function) || 893 Tok.is(tok::kw___is_fundamental) || 894 Tok.is(tok::kw___is_integral) || 895 Tok.is(tok::kw___is_member_function_pointer) || 896 Tok.is(tok::kw___is_member_pointer) || 897 Tok.is(tok::kw___is_pod) || 898 Tok.is(tok::kw___is_pointer) || 899 Tok.is(tok::kw___is_same) || 900 Tok.is(tok::kw___is_scalar) || 901 Tok.is(tok::kw___is_signed) || 902 Tok.is(tok::kw___is_unsigned) || 903 Tok.is(tok::kw___is_void))) { 904 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 905 // name of struct templates, but some are keywords in GCC >= 4.3 906 // and Clang. Therefore, when we see the token sequence "struct 907 // X", make X into a normal identifier rather than a keyword, to 908 // allow libstdc++ 4.2 and libc++ to work properly. 909 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 910 Tok.setKind(tok::identifier); 911 } 912 913 // Parse the (optional) nested-name-specifier. 914 CXXScopeSpec &SS = DS.getTypeSpecScope(); 915 if (getLang().CPlusPlus) { 916 // "FOO : BAR" is not a potential typo for "FOO::BAR". 917 ColonProtectionRAIIObject X(*this); 918 919 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 920 DS.SetTypeSpecError(); 921 if (SS.isSet()) 922 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 923 Diag(Tok, diag::err_expected_ident); 924 } 925 926 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 927 928 // Parse the (optional) class name or simple-template-id. 929 IdentifierInfo *Name = 0; 930 SourceLocation NameLoc; 931 TemplateIdAnnotation *TemplateId = 0; 932 if (Tok.is(tok::identifier)) { 933 Name = Tok.getIdentifierInfo(); 934 NameLoc = ConsumeToken(); 935 936 if (Tok.is(tok::less) && getLang().CPlusPlus) { 937 // The name was supposed to refer to a template, but didn't. 938 // Eat the template argument list and try to continue parsing this as 939 // a class (or template thereof). 940 TemplateArgList TemplateArgs; 941 SourceLocation LAngleLoc, RAngleLoc; 942 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 943 true, LAngleLoc, 944 TemplateArgs, RAngleLoc)) { 945 // We couldn't parse the template argument list at all, so don't 946 // try to give any location information for the list. 947 LAngleLoc = RAngleLoc = SourceLocation(); 948 } 949 950 Diag(NameLoc, diag::err_explicit_spec_non_template) 951 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 952 << (TagType == DeclSpec::TST_class? 0 953 : TagType == DeclSpec::TST_struct? 1 954 : 2) 955 << Name 956 << SourceRange(LAngleLoc, RAngleLoc); 957 958 // Strip off the last template parameter list if it was empty, since 959 // we've removed its template argument list. 960 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 961 if (TemplateParams && TemplateParams->size() > 1) { 962 TemplateParams->pop_back(); 963 } else { 964 TemplateParams = 0; 965 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 966 = ParsedTemplateInfo::NonTemplate; 967 } 968 } else if (TemplateInfo.Kind 969 == ParsedTemplateInfo::ExplicitInstantiation) { 970 // Pretend this is just a forward declaration. 971 TemplateParams = 0; 972 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 973 = ParsedTemplateInfo::NonTemplate; 974 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 975 = SourceLocation(); 976 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 977 = SourceLocation(); 978 } 979 } 980 } else if (Tok.is(tok::annot_template_id)) { 981 TemplateId = takeTemplateIdAnnotation(Tok); 982 NameLoc = ConsumeToken(); 983 984 if (TemplateId->Kind != TNK_Type_template && 985 TemplateId->Kind != TNK_Dependent_template_name) { 986 // The template-name in the simple-template-id refers to 987 // something other than a class template. Give an appropriate 988 // error message and skip to the ';'. 989 SourceRange Range(NameLoc); 990 if (SS.isNotEmpty()) 991 Range.setBegin(SS.getBeginLoc()); 992 993 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 994 << Name << static_cast<int>(TemplateId->Kind) << Range; 995 996 DS.SetTypeSpecError(); 997 SkipUntil(tok::semi, false, true); 998 if (SuppressingAccessChecks) 999 Actions.ActOnStopSuppressingAccessChecks(); 1000 1001 return; 1002 } 1003 } 1004 1005 // As soon as we're finished parsing the class's template-id, turn access 1006 // checking back on. 1007 if (SuppressingAccessChecks) 1008 Actions.ActOnStopSuppressingAccessChecks(); 1009 1010 // There are four options here. If we have 'struct foo;', then this 1011 // is either a forward declaration or a friend declaration, which 1012 // have to be treated differently. If we have 'struct foo {...', 1013 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1014 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1015 // However, in some contexts, things look like declarations but are just 1016 // references, e.g. 1017 // new struct s; 1018 // or 1019 // &T::operator struct s; 1020 // For these, SuppressDeclarations is true. 1021 Sema::TagUseKind TUK; 1022 if (SuppressDeclarations) 1023 TUK = Sema::TUK_Reference; 1024 else if (Tok.is(tok::l_brace) || 1025 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1026 isCXX0XFinalKeyword()) { 1027 if (DS.isFriendSpecified()) { 1028 // C++ [class.friend]p2: 1029 // A class shall not be defined in a friend declaration. 1030 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1031 << SourceRange(DS.getFriendSpecLoc()); 1032 1033 // Skip everything up to the semicolon, so that this looks like a proper 1034 // friend class (or template thereof) declaration. 1035 SkipUntil(tok::semi, true, true); 1036 TUK = Sema::TUK_Friend; 1037 } else { 1038 // Okay, this is a class definition. 1039 TUK = Sema::TUK_Definition; 1040 } 1041 } else if (Tok.is(tok::semi)) 1042 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1043 else 1044 TUK = Sema::TUK_Reference; 1045 1046 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1047 TUK != Sema::TUK_Definition)) { 1048 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1049 // We have a declaration or reference to an anonymous class. 1050 Diag(StartLoc, diag::err_anon_type_definition) 1051 << DeclSpec::getSpecifierName(TagType); 1052 } 1053 1054 SkipUntil(tok::comma, true); 1055 return; 1056 } 1057 1058 // Create the tag portion of the class or class template. 1059 DeclResult TagOrTempResult = true; // invalid 1060 TypeResult TypeResult = true; // invalid 1061 1062 bool Owned = false; 1063 if (TemplateId) { 1064 // Explicit specialization, class template partial specialization, 1065 // or explicit instantiation. 1066 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1067 TemplateId->getTemplateArgs(), 1068 TemplateId->NumArgs); 1069 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1070 TUK == Sema::TUK_Declaration) { 1071 // This is an explicit instantiation of a class template. 1072 TagOrTempResult 1073 = Actions.ActOnExplicitInstantiation(getCurScope(), 1074 TemplateInfo.ExternLoc, 1075 TemplateInfo.TemplateLoc, 1076 TagType, 1077 StartLoc, 1078 SS, 1079 TemplateId->Template, 1080 TemplateId->TemplateNameLoc, 1081 TemplateId->LAngleLoc, 1082 TemplateArgsPtr, 1083 TemplateId->RAngleLoc, 1084 attrs.getList()); 1085 1086 // Friend template-ids are treated as references unless 1087 // they have template headers, in which case they're ill-formed 1088 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1089 // We diagnose this error in ActOnClassTemplateSpecialization. 1090 } else if (TUK == Sema::TUK_Reference || 1091 (TUK == Sema::TUK_Friend && 1092 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1093 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1094 StartLoc, 1095 TemplateId->SS, 1096 TemplateId->Template, 1097 TemplateId->TemplateNameLoc, 1098 TemplateId->LAngleLoc, 1099 TemplateArgsPtr, 1100 TemplateId->RAngleLoc); 1101 } else { 1102 // This is an explicit specialization or a class template 1103 // partial specialization. 1104 TemplateParameterLists FakedParamLists; 1105 1106 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1107 // This looks like an explicit instantiation, because we have 1108 // something like 1109 // 1110 // template class Foo<X> 1111 // 1112 // but it actually has a definition. Most likely, this was 1113 // meant to be an explicit specialization, but the user forgot 1114 // the '<>' after 'template'. 1115 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1116 1117 SourceLocation LAngleLoc 1118 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1119 Diag(TemplateId->TemplateNameLoc, 1120 diag::err_explicit_instantiation_with_definition) 1121 << SourceRange(TemplateInfo.TemplateLoc) 1122 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1123 1124 // Create a fake template parameter list that contains only 1125 // "template<>", so that we treat this construct as a class 1126 // template specialization. 1127 FakedParamLists.push_back( 1128 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1129 TemplateInfo.TemplateLoc, 1130 LAngleLoc, 1131 0, 0, 1132 LAngleLoc)); 1133 TemplateParams = &FakedParamLists; 1134 } 1135 1136 // Build the class template specialization. 1137 TagOrTempResult 1138 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1139 StartLoc, SS, 1140 TemplateId->Template, 1141 TemplateId->TemplateNameLoc, 1142 TemplateId->LAngleLoc, 1143 TemplateArgsPtr, 1144 TemplateId->RAngleLoc, 1145 attrs.getList(), 1146 MultiTemplateParamsArg(Actions, 1147 TemplateParams? &(*TemplateParams)[0] : 0, 1148 TemplateParams? TemplateParams->size() : 0)); 1149 } 1150 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1151 TUK == Sema::TUK_Declaration) { 1152 // Explicit instantiation of a member of a class template 1153 // specialization, e.g., 1154 // 1155 // template struct Outer<int>::Inner; 1156 // 1157 TagOrTempResult 1158 = Actions.ActOnExplicitInstantiation(getCurScope(), 1159 TemplateInfo.ExternLoc, 1160 TemplateInfo.TemplateLoc, 1161 TagType, StartLoc, SS, Name, 1162 NameLoc, attrs.getList()); 1163 } else if (TUK == Sema::TUK_Friend && 1164 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1165 TagOrTempResult = 1166 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1167 TagType, StartLoc, SS, 1168 Name, NameLoc, attrs.getList(), 1169 MultiTemplateParamsArg(Actions, 1170 TemplateParams? &(*TemplateParams)[0] : 0, 1171 TemplateParams? TemplateParams->size() : 0)); 1172 } else { 1173 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1174 TUK == Sema::TUK_Definition) { 1175 // FIXME: Diagnose this particular error. 1176 } 1177 1178 bool IsDependent = false; 1179 1180 // Don't pass down template parameter lists if this is just a tag 1181 // reference. For example, we don't need the template parameters here: 1182 // template <class T> class A *makeA(T t); 1183 MultiTemplateParamsArg TParams; 1184 if (TUK != Sema::TUK_Reference && TemplateParams) 1185 TParams = 1186 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1187 1188 // Declaration or definition of a class type 1189 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1190 SS, Name, NameLoc, attrs.getList(), AS, 1191 TParams, Owned, IsDependent, false, 1192 false, clang::TypeResult()); 1193 1194 // If ActOnTag said the type was dependent, try again with the 1195 // less common call. 1196 if (IsDependent) { 1197 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1198 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1199 SS, Name, StartLoc, NameLoc); 1200 } 1201 } 1202 1203 // If there is a body, parse it and inform the actions module. 1204 if (TUK == Sema::TUK_Definition) { 1205 assert(Tok.is(tok::l_brace) || 1206 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1207 isCXX0XFinalKeyword()); 1208 if (getLang().CPlusPlus) 1209 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1210 else 1211 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1212 } 1213 1214 const char *PrevSpec = 0; 1215 unsigned DiagID; 1216 bool Result; 1217 if (!TypeResult.isInvalid()) { 1218 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1219 NameLoc.isValid() ? NameLoc : StartLoc, 1220 PrevSpec, DiagID, TypeResult.get()); 1221 } else if (!TagOrTempResult.isInvalid()) { 1222 Result = DS.SetTypeSpecType(TagType, StartLoc, 1223 NameLoc.isValid() ? NameLoc : StartLoc, 1224 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1225 } else { 1226 DS.SetTypeSpecError(); 1227 return; 1228 } 1229 1230 if (Result) 1231 Diag(StartLoc, DiagID) << PrevSpec; 1232 1233 // At this point, we've successfully parsed a class-specifier in 'definition' 1234 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1235 // going to look at what comes after it to improve error recovery. If an 1236 // impossible token occurs next, we assume that the programmer forgot a ; at 1237 // the end of the declaration and recover that way. 1238 // 1239 // This switch enumerates the valid "follow" set for definition. 1240 if (TUK == Sema::TUK_Definition) { 1241 bool ExpectedSemi = true; 1242 switch (Tok.getKind()) { 1243 default: break; 1244 case tok::semi: // struct foo {...} ; 1245 case tok::star: // struct foo {...} * P; 1246 case tok::amp: // struct foo {...} & R = ... 1247 case tok::identifier: // struct foo {...} V ; 1248 case tok::r_paren: //(struct foo {...} ) {4} 1249 case tok::annot_cxxscope: // struct foo {...} a:: b; 1250 case tok::annot_typename: // struct foo {...} a ::b; 1251 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1252 case tok::l_paren: // struct foo {...} ( x); 1253 case tok::comma: // __builtin_offsetof(struct foo{...} , 1254 ExpectedSemi = false; 1255 break; 1256 // Type qualifiers 1257 case tok::kw_const: // struct foo {...} const x; 1258 case tok::kw_volatile: // struct foo {...} volatile x; 1259 case tok::kw_restrict: // struct foo {...} restrict x; 1260 case tok::kw_inline: // struct foo {...} inline foo() {}; 1261 // Storage-class specifiers 1262 case tok::kw_static: // struct foo {...} static x; 1263 case tok::kw_extern: // struct foo {...} extern x; 1264 case tok::kw_typedef: // struct foo {...} typedef x; 1265 case tok::kw_register: // struct foo {...} register x; 1266 case tok::kw_auto: // struct foo {...} auto x; 1267 case tok::kw_mutable: // struct foo {...} mutable x; 1268 // As shown above, type qualifiers and storage class specifiers absolutely 1269 // can occur after class specifiers according to the grammar. However, 1270 // almost no one actually writes code like this. If we see one of these, 1271 // it is much more likely that someone missed a semi colon and the 1272 // type/storage class specifier we're seeing is part of the *next* 1273 // intended declaration, as in: 1274 // 1275 // struct foo { ... } 1276 // typedef int X; 1277 // 1278 // We'd really like to emit a missing semicolon error instead of emitting 1279 // an error on the 'int' saying that you can't have two type specifiers in 1280 // the same declaration of X. Because of this, we look ahead past this 1281 // token to see if it's a type specifier. If so, we know the code is 1282 // otherwise invalid, so we can produce the expected semi error. 1283 if (!isKnownToBeTypeSpecifier(NextToken())) 1284 ExpectedSemi = false; 1285 break; 1286 1287 case tok::r_brace: // struct bar { struct foo {...} } 1288 // Missing ';' at end of struct is accepted as an extension in C mode. 1289 if (!getLang().CPlusPlus) 1290 ExpectedSemi = false; 1291 break; 1292 } 1293 1294 // C++ [temp]p3 In a template-declaration which defines a class, no 1295 // declarator is permitted. 1296 if (TemplateInfo.Kind) 1297 ExpectedSemi = true; 1298 1299 if (ExpectedSemi) { 1300 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1301 TagType == DeclSpec::TST_class ? "class" 1302 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1303 // Push this token back into the preprocessor and change our current token 1304 // to ';' so that the rest of the code recovers as though there were an 1305 // ';' after the definition. 1306 PP.EnterToken(Tok); 1307 Tok.setKind(tok::semi); 1308 } 1309 } 1310} 1311 1312/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1313/// 1314/// base-clause : [C++ class.derived] 1315/// ':' base-specifier-list 1316/// base-specifier-list: 1317/// base-specifier '...'[opt] 1318/// base-specifier-list ',' base-specifier '...'[opt] 1319void Parser::ParseBaseClause(Decl *ClassDecl) { 1320 assert(Tok.is(tok::colon) && "Not a base clause"); 1321 ConsumeToken(); 1322 1323 // Build up an array of parsed base specifiers. 1324 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1325 1326 while (true) { 1327 // Parse a base-specifier. 1328 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1329 if (Result.isInvalid()) { 1330 // Skip the rest of this base specifier, up until the comma or 1331 // opening brace. 1332 SkipUntil(tok::comma, tok::l_brace, true, true); 1333 } else { 1334 // Add this to our array of base specifiers. 1335 BaseInfo.push_back(Result.get()); 1336 } 1337 1338 // If the next token is a comma, consume it and keep reading 1339 // base-specifiers. 1340 if (Tok.isNot(tok::comma)) break; 1341 1342 // Consume the comma. 1343 ConsumeToken(); 1344 } 1345 1346 // Attach the base specifiers 1347 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1348} 1349 1350/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1351/// one entry in the base class list of a class specifier, for example: 1352/// class foo : public bar, virtual private baz { 1353/// 'public bar' and 'virtual private baz' are each base-specifiers. 1354/// 1355/// base-specifier: [C++ class.derived] 1356/// ::[opt] nested-name-specifier[opt] class-name 1357/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1358/// class-name 1359/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1360/// class-name 1361Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1362 bool IsVirtual = false; 1363 SourceLocation StartLoc = Tok.getLocation(); 1364 1365 // Parse the 'virtual' keyword. 1366 if (Tok.is(tok::kw_virtual)) { 1367 ConsumeToken(); 1368 IsVirtual = true; 1369 } 1370 1371 // Parse an (optional) access specifier. 1372 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1373 if (Access != AS_none) 1374 ConsumeToken(); 1375 1376 // Parse the 'virtual' keyword (again!), in case it came after the 1377 // access specifier. 1378 if (Tok.is(tok::kw_virtual)) { 1379 SourceLocation VirtualLoc = ConsumeToken(); 1380 if (IsVirtual) { 1381 // Complain about duplicate 'virtual' 1382 Diag(VirtualLoc, diag::err_dup_virtual) 1383 << FixItHint::CreateRemoval(VirtualLoc); 1384 } 1385 1386 IsVirtual = true; 1387 } 1388 1389 // Parse optional '::' and optional nested-name-specifier. 1390 CXXScopeSpec SS; 1391 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1392 1393 // The location of the base class itself. 1394 SourceLocation BaseLoc = Tok.getLocation(); 1395 1396 // Parse the class-name. 1397 SourceLocation EndLocation; 1398 TypeResult BaseType = ParseClassName(EndLocation, SS); 1399 if (BaseType.isInvalid()) 1400 return true; 1401 1402 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1403 // actually part of the base-specifier-list grammar productions, but we 1404 // parse it here for convenience. 1405 SourceLocation EllipsisLoc; 1406 if (Tok.is(tok::ellipsis)) 1407 EllipsisLoc = ConsumeToken(); 1408 1409 // Find the complete source range for the base-specifier. 1410 SourceRange Range(StartLoc, EndLocation); 1411 1412 // Notify semantic analysis that we have parsed a complete 1413 // base-specifier. 1414 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1415 BaseType.get(), BaseLoc, EllipsisLoc); 1416} 1417 1418/// getAccessSpecifierIfPresent - Determine whether the next token is 1419/// a C++ access-specifier. 1420/// 1421/// access-specifier: [C++ class.derived] 1422/// 'private' 1423/// 'protected' 1424/// 'public' 1425AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1426 switch (Tok.getKind()) { 1427 default: return AS_none; 1428 case tok::kw_private: return AS_private; 1429 case tok::kw_protected: return AS_protected; 1430 case tok::kw_public: return AS_public; 1431 } 1432} 1433 1434void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1435 Decl *ThisDecl) { 1436 // We just declared a member function. If this member function 1437 // has any default arguments, we'll need to parse them later. 1438 LateParsedMethodDeclaration *LateMethod = 0; 1439 DeclaratorChunk::FunctionTypeInfo &FTI 1440 = DeclaratorInfo.getFunctionTypeInfo(); 1441 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1442 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1443 if (!LateMethod) { 1444 // Push this method onto the stack of late-parsed method 1445 // declarations. 1446 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1447 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1448 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1449 1450 // Add all of the parameters prior to this one (they don't 1451 // have default arguments). 1452 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1453 for (unsigned I = 0; I < ParamIdx; ++I) 1454 LateMethod->DefaultArgs.push_back( 1455 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1456 } 1457 1458 // Add this parameter to the list of parameters (it or may 1459 // not have a default argument). 1460 LateMethod->DefaultArgs.push_back( 1461 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1462 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1463 } 1464 } 1465} 1466 1467/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1468/// virt-specifier. 1469/// 1470/// virt-specifier: 1471/// override 1472/// final 1473VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1474 if (!getLang().CPlusPlus) 1475 return VirtSpecifiers::VS_None; 1476 1477 if (Tok.is(tok::identifier)) { 1478 IdentifierInfo *II = Tok.getIdentifierInfo(); 1479 1480 // Initialize the contextual keywords. 1481 if (!Ident_final) { 1482 Ident_final = &PP.getIdentifierTable().get("final"); 1483 Ident_override = &PP.getIdentifierTable().get("override"); 1484 } 1485 1486 if (II == Ident_override) 1487 return VirtSpecifiers::VS_Override; 1488 1489 if (II == Ident_final) 1490 return VirtSpecifiers::VS_Final; 1491 } 1492 1493 return VirtSpecifiers::VS_None; 1494} 1495 1496/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1497/// 1498/// virt-specifier-seq: 1499/// virt-specifier 1500/// virt-specifier-seq virt-specifier 1501void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1502 while (true) { 1503 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1504 if (Specifier == VirtSpecifiers::VS_None) 1505 return; 1506 1507 // C++ [class.mem]p8: 1508 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1509 const char *PrevSpec = 0; 1510 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1511 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1512 << PrevSpec 1513 << FixItHint::CreateRemoval(Tok.getLocation()); 1514 1515 if (!getLang().CPlusPlus0x) 1516 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1517 << VirtSpecifiers::getSpecifierName(Specifier); 1518 ConsumeToken(); 1519 } 1520} 1521 1522/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1523/// contextual 'final' keyword. 1524bool Parser::isCXX0XFinalKeyword() const { 1525 if (!getLang().CPlusPlus) 1526 return false; 1527 1528 if (!Tok.is(tok::identifier)) 1529 return false; 1530 1531 // Initialize the contextual keywords. 1532 if (!Ident_final) { 1533 Ident_final = &PP.getIdentifierTable().get("final"); 1534 Ident_override = &PP.getIdentifierTable().get("override"); 1535 } 1536 1537 return Tok.getIdentifierInfo() == Ident_final; 1538} 1539 1540/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1541/// 1542/// member-declaration: 1543/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1544/// function-definition ';'[opt] 1545/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1546/// using-declaration [TODO] 1547/// [C++0x] static_assert-declaration 1548/// template-declaration 1549/// [GNU] '__extension__' member-declaration 1550/// 1551/// member-declarator-list: 1552/// member-declarator 1553/// member-declarator-list ',' member-declarator 1554/// 1555/// member-declarator: 1556/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1557/// declarator constant-initializer[opt] 1558/// [C++11] declarator brace-or-equal-initializer[opt] 1559/// identifier[opt] ':' constant-expression 1560/// 1561/// virt-specifier-seq: 1562/// virt-specifier 1563/// virt-specifier-seq virt-specifier 1564/// 1565/// virt-specifier: 1566/// override 1567/// final 1568/// new 1569/// 1570/// pure-specifier: 1571/// '= 0' 1572/// 1573/// constant-initializer: 1574/// '=' constant-expression 1575/// 1576void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1577 const ParsedTemplateInfo &TemplateInfo, 1578 ParsingDeclRAIIObject *TemplateDiags) { 1579 if (Tok.is(tok::at)) { 1580 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1581 Diag(Tok, diag::err_at_defs_cxx); 1582 else 1583 Diag(Tok, diag::err_at_in_class); 1584 1585 ConsumeToken(); 1586 SkipUntil(tok::r_brace); 1587 return; 1588 } 1589 1590 // Access declarations. 1591 if (!TemplateInfo.Kind && 1592 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1593 !TryAnnotateCXXScopeToken() && 1594 Tok.is(tok::annot_cxxscope)) { 1595 bool isAccessDecl = false; 1596 if (NextToken().is(tok::identifier)) 1597 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1598 else 1599 isAccessDecl = NextToken().is(tok::kw_operator); 1600 1601 if (isAccessDecl) { 1602 // Collect the scope specifier token we annotated earlier. 1603 CXXScopeSpec SS; 1604 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1605 1606 // Try to parse an unqualified-id. 1607 UnqualifiedId Name; 1608 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1609 SkipUntil(tok::semi); 1610 return; 1611 } 1612 1613 // TODO: recover from mistakenly-qualified operator declarations. 1614 if (ExpectAndConsume(tok::semi, 1615 diag::err_expected_semi_after, 1616 "access declaration", 1617 tok::semi)) 1618 return; 1619 1620 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1621 false, SourceLocation(), 1622 SS, Name, 1623 /* AttrList */ 0, 1624 /* IsTypeName */ false, 1625 SourceLocation()); 1626 return; 1627 } 1628 } 1629 1630 // static_assert-declaration 1631 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1632 // FIXME: Check for templates 1633 SourceLocation DeclEnd; 1634 ParseStaticAssertDeclaration(DeclEnd); 1635 return; 1636 } 1637 1638 if (Tok.is(tok::kw_template)) { 1639 assert(!TemplateInfo.TemplateParams && 1640 "Nested template improperly parsed?"); 1641 SourceLocation DeclEnd; 1642 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1643 AS); 1644 return; 1645 } 1646 1647 // Handle: member-declaration ::= '__extension__' member-declaration 1648 if (Tok.is(tok::kw___extension__)) { 1649 // __extension__ silences extension warnings in the subexpression. 1650 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1651 ConsumeToken(); 1652 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1653 } 1654 1655 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1656 // is a bitfield. 1657 ColonProtectionRAIIObject X(*this); 1658 1659 ParsedAttributesWithRange attrs(AttrFactory); 1660 // Optional C++0x attribute-specifier 1661 MaybeParseCXX0XAttributes(attrs); 1662 MaybeParseMicrosoftAttributes(attrs); 1663 1664 if (Tok.is(tok::kw_using)) { 1665 ProhibitAttributes(attrs); 1666 1667 // Eat 'using'. 1668 SourceLocation UsingLoc = ConsumeToken(); 1669 1670 if (Tok.is(tok::kw_namespace)) { 1671 Diag(UsingLoc, diag::err_using_namespace_in_class); 1672 SkipUntil(tok::semi, true, true); 1673 } else { 1674 SourceLocation DeclEnd; 1675 // Otherwise, it must be a using-declaration or an alias-declaration. 1676 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1677 UsingLoc, DeclEnd, AS); 1678 } 1679 return; 1680 } 1681 1682 // decl-specifier-seq: 1683 // Parse the common declaration-specifiers piece. 1684 ParsingDeclSpec DS(*this, TemplateDiags); 1685 DS.takeAttributesFrom(attrs); 1686 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1687 1688 MultiTemplateParamsArg TemplateParams(Actions, 1689 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1690 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1691 1692 if (Tok.is(tok::semi)) { 1693 ConsumeToken(); 1694 Decl *TheDecl = 1695 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1696 DS.complete(TheDecl); 1697 return; 1698 } 1699 1700 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1701 VirtSpecifiers VS; 1702 ExprResult Init; 1703 1704 if (Tok.isNot(tok::colon)) { 1705 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1706 ColonProtectionRAIIObject X(*this); 1707 1708 // Parse the first declarator. 1709 ParseDeclarator(DeclaratorInfo); 1710 // Error parsing the declarator? 1711 if (!DeclaratorInfo.hasName()) { 1712 // If so, skip until the semi-colon or a }. 1713 SkipUntil(tok::r_brace, true, true); 1714 if (Tok.is(tok::semi)) 1715 ConsumeToken(); 1716 return; 1717 } 1718 1719 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1720 1721 // If attributes exist after the declarator, but before an '{', parse them. 1722 MaybeParseGNUAttributes(DeclaratorInfo); 1723 1724 // MSVC permits pure specifier on inline functions declared at class scope. 1725 // Hence check for =0 before checking for function definition. 1726 if (getLang().Microsoft && Tok.is(tok::equal) && 1727 DeclaratorInfo.isFunctionDeclarator() && 1728 NextToken().is(tok::numeric_constant)) { 1729 ConsumeToken(); 1730 Init = ParseInitializer(); 1731 if (Init.isInvalid()) 1732 SkipUntil(tok::comma, true, true); 1733 } 1734 1735 bool IsDefinition = false; 1736 // function-definition: 1737 // 1738 // In C++11, a non-function declarator followed by an open brace is a 1739 // braced-init-list for an in-class member initialization, not an 1740 // erroneous function definition. 1741 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1742 IsDefinition = true; 1743 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1744 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1745 IsDefinition = true; 1746 } else if (Tok.is(tok::equal)) { 1747 const Token &KW = NextToken(); 1748 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1749 IsDefinition = true; 1750 } 1751 } 1752 1753 if (IsDefinition) { 1754 if (!DeclaratorInfo.isFunctionDeclarator()) { 1755 Diag(Tok, diag::err_func_def_no_params); 1756 ConsumeBrace(); 1757 SkipUntil(tok::r_brace, true); 1758 1759 // Consume the optional ';' 1760 if (Tok.is(tok::semi)) 1761 ConsumeToken(); 1762 return; 1763 } 1764 1765 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1766 Diag(Tok, diag::err_function_declared_typedef); 1767 // This recovery skips the entire function body. It would be nice 1768 // to simply call ParseCXXInlineMethodDef() below, however Sema 1769 // assumes the declarator represents a function, not a typedef. 1770 ConsumeBrace(); 1771 SkipUntil(tok::r_brace, true); 1772 1773 // Consume the optional ';' 1774 if (Tok.is(tok::semi)) 1775 ConsumeToken(); 1776 return; 1777 } 1778 1779 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init); 1780 1781 // Consume the ';' - it's optional unless we have a delete or default 1782 if (Tok.is(tok::semi)) { 1783 ConsumeToken(); 1784 } 1785 1786 return; 1787 } 1788 } 1789 1790 // member-declarator-list: 1791 // member-declarator 1792 // member-declarator-list ',' member-declarator 1793 1794 SmallVector<Decl *, 8> DeclsInGroup; 1795 ExprResult BitfieldSize; 1796 1797 while (1) { 1798 // member-declarator: 1799 // declarator pure-specifier[opt] 1800 // declarator brace-or-equal-initializer[opt] 1801 // identifier[opt] ':' constant-expression 1802 if (Tok.is(tok::colon)) { 1803 ConsumeToken(); 1804 BitfieldSize = ParseConstantExpression(); 1805 if (BitfieldSize.isInvalid()) 1806 SkipUntil(tok::comma, true, true); 1807 } 1808 1809 // If a simple-asm-expr is present, parse it. 1810 if (Tok.is(tok::kw_asm)) { 1811 SourceLocation Loc; 1812 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1813 if (AsmLabel.isInvalid()) 1814 SkipUntil(tok::comma, true, true); 1815 1816 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1817 DeclaratorInfo.SetRangeEnd(Loc); 1818 } 1819 1820 // If attributes exist after the declarator, parse them. 1821 MaybeParseGNUAttributes(DeclaratorInfo); 1822 1823 // FIXME: When g++ adds support for this, we'll need to check whether it 1824 // goes before or after the GNU attributes and __asm__. 1825 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1826 1827 bool HasDeferredInitializer = false; 1828 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) { 1829 if (BitfieldSize.get()) { 1830 Diag(Tok, diag::err_bitfield_member_init); 1831 SkipUntil(tok::comma, true, true); 1832 } else { 1833 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1834 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1835 != DeclSpec::SCS_static && 1836 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1837 != DeclSpec::SCS_typedef; 1838 1839 if (!HasDeferredInitializer) { 1840 SourceLocation EqualLoc; 1841 Init = ParseCXXMemberInitializer( 1842 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 1843 if (Init.isInvalid()) 1844 SkipUntil(tok::comma, true, true); 1845 } 1846 } 1847 } 1848 1849 // NOTE: If Sema is the Action module and declarator is an instance field, 1850 // this call will *not* return the created decl; It will return null. 1851 // See Sema::ActOnCXXMemberDeclarator for details. 1852 1853 Decl *ThisDecl = 0; 1854 if (DS.isFriendSpecified()) { 1855 // TODO: handle initializers, bitfields, 'delete' 1856 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1857 /*IsDefinition*/ false, 1858 move(TemplateParams)); 1859 } else { 1860 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1861 DeclaratorInfo, 1862 move(TemplateParams), 1863 BitfieldSize.release(), 1864 VS, Init.release(), 1865 HasDeferredInitializer, 1866 /*IsDefinition*/ false); 1867 } 1868 if (ThisDecl) 1869 DeclsInGroup.push_back(ThisDecl); 1870 1871 if (DeclaratorInfo.isFunctionDeclarator() && 1872 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1873 != DeclSpec::SCS_typedef) { 1874 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1875 } 1876 1877 DeclaratorInfo.complete(ThisDecl); 1878 1879 if (HasDeferredInitializer) { 1880 if (!getLang().CPlusPlus0x) 1881 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension); 1882 1883 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1884 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1885 // declarator is followed by an initializer. 1886 // 1887 // A brace-or-equal-initializer for a member-declarator is not an 1888 // initializer in the gramamr, so this is ill-formed. 1889 Diag(Tok, diag::err_incomplete_array_member_init); 1890 SkipUntil(tok::comma, true, true); 1891 // Avoid later warnings about a class member of incomplete type. 1892 ThisDecl->setInvalidDecl(); 1893 } else 1894 ParseCXXNonStaticMemberInitializer(ThisDecl); 1895 } 1896 1897 // If we don't have a comma, it is either the end of the list (a ';') 1898 // or an error, bail out. 1899 if (Tok.isNot(tok::comma)) 1900 break; 1901 1902 // Consume the comma. 1903 ConsumeToken(); 1904 1905 // Parse the next declarator. 1906 DeclaratorInfo.clear(); 1907 VS.clear(); 1908 BitfieldSize = 0; 1909 Init = 0; 1910 1911 // Attributes are only allowed on the second declarator. 1912 MaybeParseGNUAttributes(DeclaratorInfo); 1913 1914 if (Tok.isNot(tok::colon)) 1915 ParseDeclarator(DeclaratorInfo); 1916 } 1917 1918 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1919 // Skip to end of block or statement. 1920 SkipUntil(tok::r_brace, true, true); 1921 // If we stopped at a ';', eat it. 1922 if (Tok.is(tok::semi)) ConsumeToken(); 1923 return; 1924 } 1925 1926 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1927 DeclsInGroup.size()); 1928} 1929 1930/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1931/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1932/// function definition. The location of the '=', if any, will be placed in 1933/// EqualLoc. 1934/// 1935/// pure-specifier: 1936/// '= 0' 1937/// 1938/// brace-or-equal-initializer: 1939/// '=' initializer-expression 1940/// braced-init-list [TODO] 1941/// 1942/// initializer-clause: 1943/// assignment-expression 1944/// braced-init-list [TODO] 1945/// 1946/// defaulted/deleted function-definition: 1947/// '=' 'default' 1948/// '=' 'delete' 1949/// 1950/// Prior to C++0x, the assignment-expression in an initializer-clause must 1951/// be a constant-expression. 1952ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1953 SourceLocation &EqualLoc) { 1954 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 1955 && "Data member initializer not starting with '=' or '{'"); 1956 1957 if (Tok.is(tok::equal)) { 1958 EqualLoc = ConsumeToken(); 1959 if (Tok.is(tok::kw_delete)) { 1960 // In principle, an initializer of '= delete p;' is legal, but it will 1961 // never type-check. It's better to diagnose it as an ill-formed expression 1962 // than as an ill-formed deleted non-function member. 1963 // An initializer of '= delete p, foo' will never be parsed, because 1964 // a top-level comma always ends the initializer expression. 1965 const Token &Next = NextToken(); 1966 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 1967 Next.is(tok::eof)) { 1968 if (IsFunction) 1969 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1970 << 1 /* delete */; 1971 else 1972 Diag(ConsumeToken(), diag::err_deleted_non_function); 1973 return ExprResult(); 1974 } 1975 } else if (Tok.is(tok::kw_default)) { 1976 Diag(ConsumeToken(), diag::err_default_special_members); 1977 if (IsFunction) 1978 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 1979 << 0 /* default */; 1980 else 1981 Diag(ConsumeToken(), diag::err_default_special_members); 1982 return ExprResult(); 1983 } 1984 1985 return ParseInitializer(); 1986 } else 1987 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 1988} 1989 1990/// ParseCXXMemberSpecification - Parse the class definition. 1991/// 1992/// member-specification: 1993/// member-declaration member-specification[opt] 1994/// access-specifier ':' member-specification[opt] 1995/// 1996void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1997 unsigned TagType, Decl *TagDecl) { 1998 assert((TagType == DeclSpec::TST_struct || 1999 TagType == DeclSpec::TST_union || 2000 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2001 2002 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2003 "parsing struct/union/class body"); 2004 2005 // Determine whether this is a non-nested class. Note that local 2006 // classes are *not* considered to be nested classes. 2007 bool NonNestedClass = true; 2008 if (!ClassStack.empty()) { 2009 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2010 if (S->isClassScope()) { 2011 // We're inside a class scope, so this is a nested class. 2012 NonNestedClass = false; 2013 break; 2014 } 2015 2016 if ((S->getFlags() & Scope::FnScope)) { 2017 // If we're in a function or function template declared in the 2018 // body of a class, then this is a local class rather than a 2019 // nested class. 2020 const Scope *Parent = S->getParent(); 2021 if (Parent->isTemplateParamScope()) 2022 Parent = Parent->getParent(); 2023 if (Parent->isClassScope()) 2024 break; 2025 } 2026 } 2027 } 2028 2029 // Enter a scope for the class. 2030 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2031 2032 // Note that we are parsing a new (potentially-nested) class definition. 2033 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2034 2035 if (TagDecl) 2036 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2037 2038 SourceLocation FinalLoc; 2039 2040 // Parse the optional 'final' keyword. 2041 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2042 IdentifierInfo *II = Tok.getIdentifierInfo(); 2043 2044 // Initialize the contextual keywords. 2045 if (!Ident_final) { 2046 Ident_final = &PP.getIdentifierTable().get("final"); 2047 Ident_override = &PP.getIdentifierTable().get("override"); 2048 } 2049 2050 if (II == Ident_final) 2051 FinalLoc = ConsumeToken(); 2052 2053 if (!getLang().CPlusPlus0x) 2054 Diag(FinalLoc, diag::ext_override_control_keyword) << "final"; 2055 } 2056 2057 if (Tok.is(tok::colon)) { 2058 ParseBaseClause(TagDecl); 2059 2060 if (!Tok.is(tok::l_brace)) { 2061 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2062 2063 if (TagDecl) 2064 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2065 return; 2066 } 2067 } 2068 2069 assert(Tok.is(tok::l_brace)); 2070 2071 SourceLocation LBraceLoc = ConsumeBrace(); 2072 2073 if (TagDecl) 2074 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2075 LBraceLoc); 2076 2077 // C++ 11p3: Members of a class defined with the keyword class are private 2078 // by default. Members of a class defined with the keywords struct or union 2079 // are public by default. 2080 AccessSpecifier CurAS; 2081 if (TagType == DeclSpec::TST_class) 2082 CurAS = AS_private; 2083 else 2084 CurAS = AS_public; 2085 2086 SourceLocation RBraceLoc; 2087 if (TagDecl) { 2088 // While we still have something to read, read the member-declarations. 2089 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2090 // Each iteration of this loop reads one member-declaration. 2091 2092 if (getLang().Microsoft && (Tok.is(tok::kw___if_exists) || 2093 Tok.is(tok::kw___if_not_exists))) { 2094 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2095 continue; 2096 } 2097 2098 // Check for extraneous top-level semicolon. 2099 if (Tok.is(tok::semi)) { 2100 Diag(Tok, diag::ext_extra_struct_semi) 2101 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2102 << FixItHint::CreateRemoval(Tok.getLocation()); 2103 ConsumeToken(); 2104 continue; 2105 } 2106 2107 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2108 if (AS != AS_none) { 2109 // Current token is a C++ access specifier. 2110 CurAS = AS; 2111 SourceLocation ASLoc = Tok.getLocation(); 2112 ConsumeToken(); 2113 if (Tok.is(tok::colon)) 2114 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2115 else 2116 Diag(Tok, diag::err_expected_colon); 2117 ConsumeToken(); 2118 continue; 2119 } 2120 2121 // FIXME: Make sure we don't have a template here. 2122 2123 // Parse all the comma separated declarators. 2124 ParseCXXClassMemberDeclaration(CurAS); 2125 } 2126 2127 RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 2128 } else { 2129 SkipUntil(tok::r_brace, false, false); 2130 } 2131 2132 // If attributes exist after class contents, parse them. 2133 ParsedAttributes attrs(AttrFactory); 2134 MaybeParseGNUAttributes(attrs); 2135 2136 if (TagDecl) 2137 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2138 LBraceLoc, RBraceLoc, 2139 attrs.getList()); 2140 2141 // C++0x [class.mem]p2: Within the class member-specification, the class is 2142 // regarded as complete within function bodies, default arguments, exception- 2143 // specifications, and brace-or-equal-initializers for non-static data 2144 // members (including such things in nested classes). 2145 // 2146 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2147 // handled. Fix the others! 2148 if (TagDecl && NonNestedClass) { 2149 // We are not inside a nested class. This class and its nested classes 2150 // are complete and we can parse the delayed portions of method 2151 // declarations and the lexed inline method definitions. 2152 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2153 ParseLexedMethodDeclarations(getCurrentClass()); 2154 ParseLexedMemberInitializers(getCurrentClass()); 2155 ParseLexedMethodDefs(getCurrentClass()); 2156 PrevTokLocation = SavedPrevTokLocation; 2157 } 2158 2159 if (TagDecl) 2160 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, RBraceLoc); 2161 2162 // Leave the class scope. 2163 ParsingDef.Pop(); 2164 ClassScope.Exit(); 2165} 2166 2167/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2168/// which explicitly initializes the members or base classes of a 2169/// class (C++ [class.base.init]). For example, the three initializers 2170/// after the ':' in the Derived constructor below: 2171/// 2172/// @code 2173/// class Base { }; 2174/// class Derived : Base { 2175/// int x; 2176/// float f; 2177/// public: 2178/// Derived(float f) : Base(), x(17), f(f) { } 2179/// }; 2180/// @endcode 2181/// 2182/// [C++] ctor-initializer: 2183/// ':' mem-initializer-list 2184/// 2185/// [C++] mem-initializer-list: 2186/// mem-initializer ...[opt] 2187/// mem-initializer ...[opt] , mem-initializer-list 2188void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2189 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2190 2191 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2192 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2193 SourceLocation ColonLoc = ConsumeToken(); 2194 2195 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2196 bool AnyErrors = false; 2197 2198 do { 2199 if (Tok.is(tok::code_completion)) { 2200 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2201 MemInitializers.data(), 2202 MemInitializers.size()); 2203 ConsumeCodeCompletionToken(); 2204 } else { 2205 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2206 if (!MemInit.isInvalid()) 2207 MemInitializers.push_back(MemInit.get()); 2208 else 2209 AnyErrors = true; 2210 } 2211 2212 if (Tok.is(tok::comma)) 2213 ConsumeToken(); 2214 else if (Tok.is(tok::l_brace)) 2215 break; 2216 // If the next token looks like a base or member initializer, assume that 2217 // we're just missing a comma. 2218 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2219 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2220 Diag(Loc, diag::err_ctor_init_missing_comma) 2221 << FixItHint::CreateInsertion(Loc, ", "); 2222 } else { 2223 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2224 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2225 SkipUntil(tok::l_brace, true, true); 2226 break; 2227 } 2228 } while (true); 2229 2230 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2231 MemInitializers.data(), MemInitializers.size(), 2232 AnyErrors); 2233} 2234 2235/// ParseMemInitializer - Parse a C++ member initializer, which is 2236/// part of a constructor initializer that explicitly initializes one 2237/// member or base class (C++ [class.base.init]). See 2238/// ParseConstructorInitializer for an example. 2239/// 2240/// [C++] mem-initializer: 2241/// mem-initializer-id '(' expression-list[opt] ')' 2242/// [C++0x] mem-initializer-id braced-init-list 2243/// 2244/// [C++] mem-initializer-id: 2245/// '::'[opt] nested-name-specifier[opt] class-name 2246/// identifier 2247Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2248 // parse '::'[opt] nested-name-specifier[opt] 2249 CXXScopeSpec SS; 2250 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2251 ParsedType TemplateTypeTy; 2252 if (Tok.is(tok::annot_template_id)) { 2253 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2254 if (TemplateId->Kind == TNK_Type_template || 2255 TemplateId->Kind == TNK_Dependent_template_name) { 2256 AnnotateTemplateIdTokenAsType(); 2257 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2258 TemplateTypeTy = getTypeAnnotation(Tok); 2259 } 2260 } 2261 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2262 Diag(Tok, diag::err_expected_member_or_base_name); 2263 return true; 2264 } 2265 2266 // Get the identifier. This may be a member name or a class name, 2267 // but we'll let the semantic analysis determine which it is. 2268 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2269 SourceLocation IdLoc = ConsumeToken(); 2270 2271 // Parse the '('. 2272 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2273 // FIXME: Do something with the braced-init-list. 2274 ParseBraceInitializer(); 2275 return true; 2276 } else if(Tok.is(tok::l_paren)) { 2277 SourceLocation LParenLoc = ConsumeParen(); 2278 2279 // Parse the optional expression-list. 2280 ExprVector ArgExprs(Actions); 2281 CommaLocsTy CommaLocs; 2282 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2283 SkipUntil(tok::r_paren); 2284 return true; 2285 } 2286 2287 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2288 2289 SourceLocation EllipsisLoc; 2290 if (Tok.is(tok::ellipsis)) 2291 EllipsisLoc = ConsumeToken(); 2292 2293 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2294 TemplateTypeTy, IdLoc, 2295 LParenLoc, ArgExprs.take(), 2296 ArgExprs.size(), RParenLoc, 2297 EllipsisLoc); 2298 } 2299 2300 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2301 : diag::err_expected_lparen); 2302 return true; 2303} 2304 2305/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2306/// 2307/// exception-specification: 2308/// dynamic-exception-specification 2309/// noexcept-specification 2310/// 2311/// noexcept-specification: 2312/// 'noexcept' 2313/// 'noexcept' '(' constant-expression ')' 2314ExceptionSpecificationType 2315Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2316 SmallVectorImpl<ParsedType> &DynamicExceptions, 2317 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2318 ExprResult &NoexceptExpr) { 2319 ExceptionSpecificationType Result = EST_None; 2320 2321 // See if there's a dynamic specification. 2322 if (Tok.is(tok::kw_throw)) { 2323 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2324 DynamicExceptions, 2325 DynamicExceptionRanges); 2326 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2327 "Produced different number of exception types and ranges."); 2328 } 2329 2330 // If there's no noexcept specification, we're done. 2331 if (Tok.isNot(tok::kw_noexcept)) 2332 return Result; 2333 2334 // If we already had a dynamic specification, parse the noexcept for, 2335 // recovery, but emit a diagnostic and don't store the results. 2336 SourceRange NoexceptRange; 2337 ExceptionSpecificationType NoexceptType = EST_None; 2338 2339 SourceLocation KeywordLoc = ConsumeToken(); 2340 if (Tok.is(tok::l_paren)) { 2341 // There is an argument. 2342 SourceLocation LParenLoc = ConsumeParen(); 2343 NoexceptType = EST_ComputedNoexcept; 2344 NoexceptExpr = ParseConstantExpression(); 2345 // The argument must be contextually convertible to bool. We use 2346 // ActOnBooleanCondition for this purpose. 2347 if (!NoexceptExpr.isInvalid()) 2348 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2349 NoexceptExpr.get()); 2350 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2351 NoexceptRange = SourceRange(KeywordLoc, RParenLoc); 2352 } else { 2353 // There is no argument. 2354 NoexceptType = EST_BasicNoexcept; 2355 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2356 } 2357 2358 if (Result == EST_None) { 2359 SpecificationRange = NoexceptRange; 2360 Result = NoexceptType; 2361 2362 // If there's a dynamic specification after a noexcept specification, 2363 // parse that and ignore the results. 2364 if (Tok.is(tok::kw_throw)) { 2365 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2366 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2367 DynamicExceptionRanges); 2368 } 2369 } else { 2370 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2371 } 2372 2373 return Result; 2374} 2375 2376/// ParseDynamicExceptionSpecification - Parse a C++ 2377/// dynamic-exception-specification (C++ [except.spec]). 2378/// 2379/// dynamic-exception-specification: 2380/// 'throw' '(' type-id-list [opt] ')' 2381/// [MS] 'throw' '(' '...' ')' 2382/// 2383/// type-id-list: 2384/// type-id ... [opt] 2385/// type-id-list ',' type-id ... [opt] 2386/// 2387ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2388 SourceRange &SpecificationRange, 2389 SmallVectorImpl<ParsedType> &Exceptions, 2390 SmallVectorImpl<SourceRange> &Ranges) { 2391 assert(Tok.is(tok::kw_throw) && "expected throw"); 2392 2393 SpecificationRange.setBegin(ConsumeToken()); 2394 2395 if (!Tok.is(tok::l_paren)) { 2396 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2397 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2398 return EST_DynamicNone; 2399 } 2400 SourceLocation LParenLoc = ConsumeParen(); 2401 2402 // Parse throw(...), a Microsoft extension that means "this function 2403 // can throw anything". 2404 if (Tok.is(tok::ellipsis)) { 2405 SourceLocation EllipsisLoc = ConsumeToken(); 2406 if (!getLang().Microsoft) 2407 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2408 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 2409 SpecificationRange.setEnd(RParenLoc); 2410 return EST_MSAny; 2411 } 2412 2413 // Parse the sequence of type-ids. 2414 SourceRange Range; 2415 while (Tok.isNot(tok::r_paren)) { 2416 TypeResult Res(ParseTypeName(&Range)); 2417 2418 if (Tok.is(tok::ellipsis)) { 2419 // C++0x [temp.variadic]p5: 2420 // - In a dynamic-exception-specification (15.4); the pattern is a 2421 // type-id. 2422 SourceLocation Ellipsis = ConsumeToken(); 2423 Range.setEnd(Ellipsis); 2424 if (!Res.isInvalid()) 2425 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2426 } 2427 2428 if (!Res.isInvalid()) { 2429 Exceptions.push_back(Res.get()); 2430 Ranges.push_back(Range); 2431 } 2432 2433 if (Tok.is(tok::comma)) 2434 ConsumeToken(); 2435 else 2436 break; 2437 } 2438 2439 SpecificationRange.setEnd(MatchRHSPunctuation(tok::r_paren, LParenLoc)); 2440 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2441} 2442 2443/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2444/// function declaration. 2445TypeResult Parser::ParseTrailingReturnType() { 2446 assert(Tok.is(tok::arrow) && "expected arrow"); 2447 2448 ConsumeToken(); 2449 2450 // FIXME: Need to suppress declarations when parsing this typename. 2451 // Otherwise in this function definition: 2452 // 2453 // auto f() -> struct X {} 2454 // 2455 // struct X is parsed as class definition because of the trailing 2456 // brace. 2457 2458 SourceRange Range; 2459 return ParseTypeName(&Range); 2460} 2461 2462/// \brief We have just started parsing the definition of a new class, 2463/// so push that class onto our stack of classes that is currently 2464/// being parsed. 2465Sema::ParsingClassState 2466Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2467 assert((NonNestedClass || !ClassStack.empty()) && 2468 "Nested class without outer class"); 2469 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2470 return Actions.PushParsingClass(); 2471} 2472 2473/// \brief Deallocate the given parsed class and all of its nested 2474/// classes. 2475void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2476 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2477 delete Class->LateParsedDeclarations[I]; 2478 delete Class; 2479} 2480 2481/// \brief Pop the top class of the stack of classes that are 2482/// currently being parsed. 2483/// 2484/// This routine should be called when we have finished parsing the 2485/// definition of a class, but have not yet popped the Scope 2486/// associated with the class's definition. 2487/// 2488/// \returns true if the class we've popped is a top-level class, 2489/// false otherwise. 2490void Parser::PopParsingClass(Sema::ParsingClassState state) { 2491 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2492 2493 Actions.PopParsingClass(state); 2494 2495 ParsingClass *Victim = ClassStack.top(); 2496 ClassStack.pop(); 2497 if (Victim->TopLevelClass) { 2498 // Deallocate all of the nested classes of this class, 2499 // recursively: we don't need to keep any of this information. 2500 DeallocateParsedClasses(Victim); 2501 return; 2502 } 2503 assert(!ClassStack.empty() && "Missing top-level class?"); 2504 2505 if (Victim->LateParsedDeclarations.empty()) { 2506 // The victim is a nested class, but we will not need to perform 2507 // any processing after the definition of this class since it has 2508 // no members whose handling was delayed. Therefore, we can just 2509 // remove this nested class. 2510 DeallocateParsedClasses(Victim); 2511 return; 2512 } 2513 2514 // This nested class has some members that will need to be processed 2515 // after the top-level class is completely defined. Therefore, add 2516 // it to the list of nested classes within its parent. 2517 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2518 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2519 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2520} 2521 2522/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 2523/// parses standard attributes. 2524/// 2525/// [C++0x] attribute-specifier: 2526/// '[' '[' attribute-list ']' ']' 2527/// 2528/// [C++0x] attribute-list: 2529/// attribute[opt] 2530/// attribute-list ',' attribute[opt] 2531/// 2532/// [C++0x] attribute: 2533/// attribute-token attribute-argument-clause[opt] 2534/// 2535/// [C++0x] attribute-token: 2536/// identifier 2537/// attribute-scoped-token 2538/// 2539/// [C++0x] attribute-scoped-token: 2540/// attribute-namespace '::' identifier 2541/// 2542/// [C++0x] attribute-namespace: 2543/// identifier 2544/// 2545/// [C++0x] attribute-argument-clause: 2546/// '(' balanced-token-seq ')' 2547/// 2548/// [C++0x] balanced-token-seq: 2549/// balanced-token 2550/// balanced-token-seq balanced-token 2551/// 2552/// [C++0x] balanced-token: 2553/// '(' balanced-token-seq ')' 2554/// '[' balanced-token-seq ']' 2555/// '{' balanced-token-seq '}' 2556/// any token but '(', ')', '[', ']', '{', or '}' 2557void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2558 SourceLocation *endLoc) { 2559 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2560 && "Not a C++0x attribute list"); 2561 2562 SourceLocation StartLoc = Tok.getLocation(), Loc; 2563 2564 ConsumeBracket(); 2565 ConsumeBracket(); 2566 2567 if (Tok.is(tok::comma)) { 2568 Diag(Tok.getLocation(), diag::err_expected_ident); 2569 ConsumeToken(); 2570 } 2571 2572 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2573 // attribute not present 2574 if (Tok.is(tok::comma)) { 2575 ConsumeToken(); 2576 continue; 2577 } 2578 2579 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2580 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2581 2582 // scoped attribute 2583 if (Tok.is(tok::coloncolon)) { 2584 ConsumeToken(); 2585 2586 if (!Tok.is(tok::identifier)) { 2587 Diag(Tok.getLocation(), diag::err_expected_ident); 2588 SkipUntil(tok::r_square, tok::comma, true, true); 2589 continue; 2590 } 2591 2592 ScopeName = AttrName; 2593 ScopeLoc = AttrLoc; 2594 2595 AttrName = Tok.getIdentifierInfo(); 2596 AttrLoc = ConsumeToken(); 2597 } 2598 2599 bool AttrParsed = false; 2600 // No scoped names are supported; ideally we could put all non-standard 2601 // attributes into namespaces. 2602 if (!ScopeName) { 2603 switch(AttributeList::getKind(AttrName)) 2604 { 2605 // No arguments 2606 case AttributeList::AT_carries_dependency: 2607 case AttributeList::AT_noreturn: { 2608 if (Tok.is(tok::l_paren)) { 2609 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2610 << AttrName->getName(); 2611 break; 2612 } 2613 2614 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2615 SourceLocation(), 0, 0, false, true); 2616 AttrParsed = true; 2617 break; 2618 } 2619 2620 // One argument; must be a type-id or assignment-expression 2621 case AttributeList::AT_aligned: { 2622 if (Tok.isNot(tok::l_paren)) { 2623 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 2624 << AttrName->getName(); 2625 break; 2626 } 2627 SourceLocation ParamLoc = ConsumeParen(); 2628 2629 ExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 2630 2631 MatchRHSPunctuation(tok::r_paren, ParamLoc); 2632 2633 ExprVector ArgExprs(Actions); 2634 ArgExprs.push_back(ArgExpr.release()); 2635 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 2636 0, ParamLoc, ArgExprs.take(), 1, 2637 false, true); 2638 2639 AttrParsed = true; 2640 break; 2641 } 2642 2643 // Silence warnings 2644 default: break; 2645 } 2646 } 2647 2648 // Skip the entire parameter clause, if any 2649 if (!AttrParsed && Tok.is(tok::l_paren)) { 2650 ConsumeParen(); 2651 // SkipUntil maintains the balancedness of tokens. 2652 SkipUntil(tok::r_paren, false); 2653 } 2654 } 2655 2656 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2657 SkipUntil(tok::r_square, false); 2658 Loc = Tok.getLocation(); 2659 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2660 SkipUntil(tok::r_square, false); 2661 2662 attrs.Range = SourceRange(StartLoc, Loc); 2663} 2664 2665/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 2666/// attribute. 2667/// 2668/// FIXME: Simply returns an alignof() expression if the argument is a 2669/// type. Ideally, the type should be propagated directly into Sema. 2670/// 2671/// [C++0x] 'align' '(' type-id ')' 2672/// [C++0x] 'align' '(' assignment-expression ')' 2673ExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2674 if (isTypeIdInParens()) { 2675 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2676 SourceLocation TypeLoc = Tok.getLocation(); 2677 ParsedType Ty = ParseTypeName().get(); 2678 SourceRange TypeRange(Start, Tok.getLocation()); 2679 return Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true, 2680 Ty.getAsOpaquePtr(), TypeRange); 2681 } else 2682 return ParseConstantExpression(); 2683} 2684 2685/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2686/// 2687/// [MS] ms-attribute: 2688/// '[' token-seq ']' 2689/// 2690/// [MS] ms-attribute-seq: 2691/// ms-attribute[opt] 2692/// ms-attribute ms-attribute-seq 2693void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2694 SourceLocation *endLoc) { 2695 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2696 2697 while (Tok.is(tok::l_square)) { 2698 ConsumeBracket(); 2699 SkipUntil(tok::r_square, true, true); 2700 if (endLoc) *endLoc = Tok.getLocation(); 2701 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2702 } 2703} 2704 2705void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2706 AccessSpecifier& CurAS) { 2707 bool Result; 2708 if (ParseMicrosoftIfExistsCondition(Result)) 2709 return; 2710 2711 if (Tok.isNot(tok::l_brace)) { 2712 Diag(Tok, diag::err_expected_lbrace); 2713 return; 2714 } 2715 ConsumeBrace(); 2716 2717 // Condition is false skip all inside the {}. 2718 if (!Result) { 2719 SkipUntil(tok::r_brace, false); 2720 return; 2721 } 2722 2723 // Condition is true, parse the declaration. 2724 while (Tok.isNot(tok::r_brace)) { 2725 2726 // __if_exists, __if_not_exists can nest. 2727 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2728 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2729 continue; 2730 } 2731 2732 // Check for extraneous top-level semicolon. 2733 if (Tok.is(tok::semi)) { 2734 Diag(Tok, diag::ext_extra_struct_semi) 2735 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2736 << FixItHint::CreateRemoval(Tok.getLocation()); 2737 ConsumeToken(); 2738 continue; 2739 } 2740 2741 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2742 if (AS != AS_none) { 2743 // Current token is a C++ access specifier. 2744 CurAS = AS; 2745 SourceLocation ASLoc = Tok.getLocation(); 2746 ConsumeToken(); 2747 if (Tok.is(tok::colon)) 2748 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2749 else 2750 Diag(Tok, diag::err_expected_colon); 2751 ConsumeToken(); 2752 continue; 2753 } 2754 2755 // Parse all the comma separated declarators. 2756 ParseCXXClassMemberDeclaration(CurAS); 2757 } 2758 2759 if (Tok.isNot(tok::r_brace)) { 2760 Diag(Tok, diag::err_expected_rbrace); 2761 return; 2762 } 2763 ConsumeBrace(); 2764} 2765