ParseDeclCXX.cpp revision 4a8dfb511e8f84b2e38b7a86d8ddf05ac1e1a41b
1//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the C++ Declaration portions of the Parser interfaces. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Basic/OperatorKinds.h" 15#include "clang/Parse/Parser.h" 16#include "clang/Parse/ParseDiagnostic.h" 17#include "clang/Sema/DeclSpec.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ParsedTemplate.h" 20#include "clang/Sema/PrettyDeclStackTrace.h" 21#include "RAIIObjectsForParser.h" 22using namespace clang; 23 24/// ParseNamespace - We know that the current token is a namespace keyword. This 25/// may either be a top level namespace or a block-level namespace alias. If 26/// there was an inline keyword, it has already been parsed. 27/// 28/// namespace-definition: [C++ 7.3: basic.namespace] 29/// named-namespace-definition 30/// unnamed-namespace-definition 31/// 32/// unnamed-namespace-definition: 33/// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}' 34/// 35/// named-namespace-definition: 36/// original-namespace-definition 37/// extension-namespace-definition 38/// 39/// original-namespace-definition: 40/// 'inline'[opt] 'namespace' identifier attributes[opt] 41/// '{' namespace-body '}' 42/// 43/// extension-namespace-definition: 44/// 'inline'[opt] 'namespace' original-namespace-name 45/// '{' namespace-body '}' 46/// 47/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 48/// 'namespace' identifier '=' qualified-namespace-specifier ';' 49/// 50Decl *Parser::ParseNamespace(unsigned Context, 51 SourceLocation &DeclEnd, 52 SourceLocation InlineLoc) { 53 assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 54 SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 55 ObjCDeclContextSwitch ObjCDC(*this); 56 57 if (Tok.is(tok::code_completion)) { 58 Actions.CodeCompleteNamespaceDecl(getCurScope()); 59 cutOffParsing(); 60 return 0; 61 } 62 63 SourceLocation IdentLoc; 64 IdentifierInfo *Ident = 0; 65 std::vector<SourceLocation> ExtraIdentLoc; 66 std::vector<IdentifierInfo*> ExtraIdent; 67 std::vector<SourceLocation> ExtraNamespaceLoc; 68 69 Token attrTok; 70 71 if (Tok.is(tok::identifier)) { 72 Ident = Tok.getIdentifierInfo(); 73 IdentLoc = ConsumeToken(); // eat the identifier. 74 while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) { 75 ExtraNamespaceLoc.push_back(ConsumeToken()); 76 ExtraIdent.push_back(Tok.getIdentifierInfo()); 77 ExtraIdentLoc.push_back(ConsumeToken()); 78 } 79 } 80 81 // Read label attributes, if present. 82 ParsedAttributes attrs(AttrFactory); 83 if (Tok.is(tok::kw___attribute)) { 84 attrTok = Tok; 85 ParseGNUAttributes(attrs); 86 } 87 88 if (Tok.is(tok::equal)) { 89 if (!attrs.empty()) 90 Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 91 if (InlineLoc.isValid()) 92 Diag(InlineLoc, diag::err_inline_namespace_alias) 93 << FixItHint::CreateRemoval(InlineLoc); 94 return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 95 } 96 97 98 BalancedDelimiterTracker T(*this, tok::l_brace); 99 if (T.consumeOpen()) { 100 if (!ExtraIdent.empty()) { 101 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 102 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 103 } 104 Diag(Tok, Ident ? diag::err_expected_lbrace : 105 diag::err_expected_ident_lbrace); 106 return 0; 107 } 108 109 if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() || 110 getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() || 111 getCurScope()->getFnParent()) { 112 if (!ExtraIdent.empty()) { 113 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 114 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 115 } 116 Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope); 117 SkipUntil(tok::r_brace, false); 118 return 0; 119 } 120 121 if (!ExtraIdent.empty()) { 122 TentativeParsingAction TPA(*this); 123 SkipUntil(tok::r_brace, /*StopAtSemi*/false, /*DontConsume*/true); 124 Token rBraceToken = Tok; 125 TPA.Revert(); 126 127 if (!rBraceToken.is(tok::r_brace)) { 128 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 129 << SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back()); 130 } else { 131 std::string NamespaceFix; 132 for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(), 133 E = ExtraIdent.end(); I != E; ++I) { 134 NamespaceFix += " { namespace "; 135 NamespaceFix += (*I)->getName(); 136 } 137 138 std::string RBraces; 139 for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i) 140 RBraces += "} "; 141 142 Diag(ExtraNamespaceLoc[0], diag::err_nested_namespaces_with_double_colon) 143 << FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(), 144 ExtraIdentLoc.back()), 145 NamespaceFix) 146 << FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces); 147 } 148 } 149 150 // If we're still good, complain about inline namespaces in non-C++0x now. 151 if (!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, T.getOpenLocation(), 160 attrs.getList()); 161 162 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 163 "parsing namespace"); 164 165 // Parse the contents of the namespace. This includes parsing recovery on 166 // any improperly nested namespaces. 167 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 168 InlineLoc, attrs, T); 169 170 // Leave the namespace scope. 171 NamespaceScope.Exit(); 172 173 DeclEnd = T.getCloseLocation(); 174 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); 175 176 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 ParsedAttributes& attrs, 185 BalancedDelimiterTracker &Tracker) { 186 if (index == Ident.size()) { 187 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 188 ParsedAttributesWithRange attrs(AttrFactory); 189 MaybeParseCXX0XAttributes(attrs); 190 MaybeParseMicrosoftAttributes(attrs); 191 ParseExternalDeclaration(attrs); 192 } 193 194 // The caller is what called check -- we are simply calling 195 // the close for it. 196 Tracker.consumeClose(); 197 198 return; 199 } 200 201 // Parse improperly nested namespaces. 202 ParseScope NamespaceScope(this, Scope::DeclScope); 203 Decl *NamespcDecl = 204 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 205 NamespaceLoc[index], IdentLoc[index], 206 Ident[index], Tracker.getOpenLocation(), 207 attrs.getList()); 208 209 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 210 attrs, Tracker); 211 212 NamespaceScope.Exit(); 213 214 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); 215} 216 217/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 218/// alias definition. 219/// 220Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 221 SourceLocation AliasLoc, 222 IdentifierInfo *Alias, 223 SourceLocation &DeclEnd) { 224 assert(Tok.is(tok::equal) && "Not equal token"); 225 226 ConsumeToken(); // eat the '='. 227 228 if (Tok.is(tok::code_completion)) { 229 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 230 cutOffParsing(); 231 return 0; 232 } 233 234 CXXScopeSpec SS; 235 // Parse (optional) nested-name-specifier. 236 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 237 238 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 239 Diag(Tok, diag::err_expected_namespace_name); 240 // Skip to end of the definition and eat the ';'. 241 SkipUntil(tok::semi); 242 return 0; 243 } 244 245 // Parse identifier. 246 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 247 SourceLocation IdentLoc = ConsumeToken(); 248 249 // Eat the ';'. 250 DeclEnd = Tok.getLocation(); 251 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 252 "", tok::semi); 253 254 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 255 SS, IdentLoc, Ident); 256} 257 258/// ParseLinkage - We know that the current token is a string_literal 259/// and just before that, that extern was seen. 260/// 261/// linkage-specification: [C++ 7.5p2: dcl.link] 262/// 'extern' string-literal '{' declaration-seq[opt] '}' 263/// 'extern' string-literal declaration 264/// 265Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 266 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 267 llvm::SmallString<8> LangBuffer; 268 bool Invalid = false; 269 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 270 if (Invalid) 271 return 0; 272 273 SourceLocation Loc = ConsumeStringToken(); 274 275 ParseScope LinkageScope(this, Scope::DeclScope); 276 Decl *LinkageSpec 277 = Actions.ActOnStartLinkageSpecification(getCurScope(), 278 DS.getSourceRange().getBegin(), 279 Loc, Lang, 280 Tok.is(tok::l_brace) ? Tok.getLocation() 281 : SourceLocation()); 282 283 ParsedAttributesWithRange attrs(AttrFactory); 284 MaybeParseCXX0XAttributes(attrs); 285 MaybeParseMicrosoftAttributes(attrs); 286 287 if (Tok.isNot(tok::l_brace)) { 288 // Reset the source range in DS, as the leading "extern" 289 // does not really belong to the inner declaration ... 290 DS.SetRangeStart(SourceLocation()); 291 DS.SetRangeEnd(SourceLocation()); 292 // ... but anyway remember that such an "extern" was seen. 293 DS.setExternInLinkageSpec(true); 294 ParseExternalDeclaration(attrs, &DS); 295 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 296 SourceLocation()); 297 } 298 299 DS.abort(); 300 301 ProhibitAttributes(attrs); 302 303 BalancedDelimiterTracker T(*this, tok::l_brace); 304 T.consumeOpen(); 305 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 306 ParsedAttributesWithRange attrs(AttrFactory); 307 MaybeParseCXX0XAttributes(attrs); 308 MaybeParseMicrosoftAttributes(attrs); 309 ParseExternalDeclaration(attrs); 310 } 311 312 T.consumeClose(); 313 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 314 T.getCloseLocation()); 315} 316 317/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 318/// using-directive. Assumes that current token is 'using'. 319Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 320 const ParsedTemplateInfo &TemplateInfo, 321 SourceLocation &DeclEnd, 322 ParsedAttributesWithRange &attrs, 323 Decl **OwnedType) { 324 assert(Tok.is(tok::kw_using) && "Not using token"); 325 ObjCDeclContextSwitch ObjCDC(*this); 326 327 // Eat 'using'. 328 SourceLocation UsingLoc = ConsumeToken(); 329 330 if (Tok.is(tok::code_completion)) { 331 Actions.CodeCompleteUsing(getCurScope()); 332 cutOffParsing(); 333 return 0; 334 } 335 336 // 'using namespace' means this is a using-directive. 337 if (Tok.is(tok::kw_namespace)) { 338 // Template parameters are always an error here. 339 if (TemplateInfo.Kind) { 340 SourceRange R = TemplateInfo.getSourceRange(); 341 Diag(UsingLoc, diag::err_templated_using_directive) 342 << R << FixItHint::CreateRemoval(R); 343 } 344 345 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 346 } 347 348 // Otherwise, it must be a using-declaration or an alias-declaration. 349 350 // Using declarations can't have attributes. 351 ProhibitAttributes(attrs); 352 353 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 354 AS_none, OwnedType); 355} 356 357/// ParseUsingDirective - Parse C++ using-directive, assumes 358/// that current token is 'namespace' and 'using' was already parsed. 359/// 360/// using-directive: [C++ 7.3.p4: namespace.udir] 361/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 362/// namespace-name ; 363/// [GNU] using-directive: 364/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 365/// namespace-name attributes[opt] ; 366/// 367Decl *Parser::ParseUsingDirective(unsigned Context, 368 SourceLocation UsingLoc, 369 SourceLocation &DeclEnd, 370 ParsedAttributes &attrs) { 371 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 372 373 // Eat 'namespace'. 374 SourceLocation NamespcLoc = ConsumeToken(); 375 376 if (Tok.is(tok::code_completion)) { 377 Actions.CodeCompleteUsingDirective(getCurScope()); 378 cutOffParsing(); 379 return 0; 380 } 381 382 CXXScopeSpec SS; 383 // Parse (optional) nested-name-specifier. 384 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 385 386 IdentifierInfo *NamespcName = 0; 387 SourceLocation IdentLoc = SourceLocation(); 388 389 // Parse namespace-name. 390 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 391 Diag(Tok, diag::err_expected_namespace_name); 392 // If there was invalid namespace name, skip to end of decl, and eat ';'. 393 SkipUntil(tok::semi); 394 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 395 return 0; 396 } 397 398 // Parse identifier. 399 NamespcName = Tok.getIdentifierInfo(); 400 IdentLoc = ConsumeToken(); 401 402 // Parse (optional) attributes (most likely GNU strong-using extension). 403 bool GNUAttr = false; 404 if (Tok.is(tok::kw___attribute)) { 405 GNUAttr = true; 406 ParseGNUAttributes(attrs); 407 } 408 409 // Eat ';'. 410 DeclEnd = Tok.getLocation(); 411 ExpectAndConsume(tok::semi, 412 GNUAttr ? diag::err_expected_semi_after_attribute_list 413 : diag::err_expected_semi_after_namespace_name, 414 "", tok::semi); 415 416 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 417 IdentLoc, NamespcName, attrs.getList()); 418} 419 420/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 421/// Assumes that 'using' was already seen. 422/// 423/// using-declaration: [C++ 7.3.p3: namespace.udecl] 424/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 425/// unqualified-id 426/// 'using' :: unqualified-id 427/// 428/// alias-declaration: C++0x [decl.typedef]p2 429/// 'using' identifier = type-id ; 430/// 431Decl *Parser::ParseUsingDeclaration(unsigned Context, 432 const ParsedTemplateInfo &TemplateInfo, 433 SourceLocation UsingLoc, 434 SourceLocation &DeclEnd, 435 AccessSpecifier AS, 436 Decl **OwnedType) { 437 CXXScopeSpec SS; 438 SourceLocation TypenameLoc; 439 bool IsTypeName; 440 441 // Ignore optional 'typename'. 442 // FIXME: This is wrong; we should parse this as a typename-specifier. 443 if (Tok.is(tok::kw_typename)) { 444 TypenameLoc = Tok.getLocation(); 445 ConsumeToken(); 446 IsTypeName = true; 447 } 448 else 449 IsTypeName = false; 450 451 // Parse nested-name-specifier. 452 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 453 454 // Check nested-name specifier. 455 if (SS.isInvalid()) { 456 SkipUntil(tok::semi); 457 return 0; 458 } 459 460 // Parse the unqualified-id. We allow parsing of both constructor and 461 // destructor names and allow the action module to diagnose any semantic 462 // errors. 463 UnqualifiedId Name; 464 if (ParseUnqualifiedId(SS, 465 /*EnteringContext=*/false, 466 /*AllowDestructorName=*/true, 467 /*AllowConstructorName=*/true, 468 ParsedType(), 469 Name)) { 470 SkipUntil(tok::semi); 471 return 0; 472 } 473 474 ParsedAttributes attrs(AttrFactory); 475 476 // Maybe this is an alias-declaration. 477 bool IsAliasDecl = Tok.is(tok::equal); 478 TypeResult TypeAlias; 479 if (IsAliasDecl) { 480 // TODO: Attribute support. C++0x attributes may appear before the equals. 481 // Where can GNU attributes appear? 482 ConsumeToken(); 483 484 if (!getLang().CPlusPlus0x) 485 Diag(Tok.getLocation(), diag::ext_alias_declaration); 486 487 // Type alias templates cannot be specialized. 488 int SpecKind = -1; 489 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 490 Name.getKind() == UnqualifiedId::IK_TemplateId) 491 SpecKind = 0; 492 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 493 SpecKind = 1; 494 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 495 SpecKind = 2; 496 if (SpecKind != -1) { 497 SourceRange Range; 498 if (SpecKind == 0) 499 Range = SourceRange(Name.TemplateId->LAngleLoc, 500 Name.TemplateId->RAngleLoc); 501 else 502 Range = TemplateInfo.getSourceRange(); 503 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 504 << SpecKind << Range; 505 SkipUntil(tok::semi); 506 return 0; 507 } 508 509 // Name must be an identifier. 510 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 511 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 512 // No removal fixit: can't recover from this. 513 SkipUntil(tok::semi); 514 return 0; 515 } else if (IsTypeName) 516 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 517 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 518 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 519 else if (SS.isNotEmpty()) 520 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 521 << FixItHint::CreateRemoval(SS.getRange()); 522 523 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 524 Declarator::AliasTemplateContext : 525 Declarator::AliasDeclContext, AS, OwnedType); 526 } else 527 // Parse (optional) attributes (most likely GNU strong-using extension). 528 MaybeParseGNUAttributes(attrs); 529 530 // Eat ';'. 531 DeclEnd = Tok.getLocation(); 532 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 533 !attrs.empty() ? "attributes list" : 534 IsAliasDecl ? "alias declaration" : "using declaration", 535 tok::semi); 536 537 // Diagnose an attempt to declare a templated using-declaration. 538 // In C++0x, alias-declarations can be templates: 539 // template <...> using id = type; 540 if (TemplateInfo.Kind && !IsAliasDecl) { 541 SourceRange R = TemplateInfo.getSourceRange(); 542 Diag(UsingLoc, diag::err_templated_using_declaration) 543 << R << FixItHint::CreateRemoval(R); 544 545 // Unfortunately, we have to bail out instead of recovering by 546 // ignoring the parameters, just in case the nested name specifier 547 // depends on the parameters. 548 return 0; 549 } 550 551 // "typename" keyword is allowed for identifiers only, 552 // because it may be a type definition. 553 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) { 554 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) 555 << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); 556 // Proceed parsing, but reset the IsTypeName flag. 557 IsTypeName = false; 558 } 559 560 if (IsAliasDecl) { 561 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 562 MultiTemplateParamsArg TemplateParamsArg(Actions, 563 TemplateParams ? TemplateParams->data() : 0, 564 TemplateParams ? TemplateParams->size() : 0); 565 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 566 UsingLoc, Name, TypeAlias); 567 } 568 569 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 570 Name, attrs.getList(), 571 IsTypeName, TypenameLoc); 572} 573 574/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 575/// 576/// [C++0x] static_assert-declaration: 577/// static_assert ( constant-expression , string-literal ) ; 578/// 579/// [C1X] static_assert-declaration: 580/// _Static_assert ( constant-expression , string-literal ) ; 581/// 582Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 583 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 584 "Not a static_assert declaration"); 585 586 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 587 Diag(Tok, diag::ext_c1x_static_assert); 588 589 SourceLocation StaticAssertLoc = ConsumeToken(); 590 591 BalancedDelimiterTracker T(*this, tok::l_paren); 592 if (T.consumeOpen()) { 593 Diag(Tok, diag::err_expected_lparen); 594 return 0; 595 } 596 597 ExprResult AssertExpr(ParseConstantExpression()); 598 if (AssertExpr.isInvalid()) { 599 SkipUntil(tok::semi); 600 return 0; 601 } 602 603 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 604 return 0; 605 606 if (Tok.isNot(tok::string_literal)) { 607 Diag(Tok, diag::err_expected_string_literal); 608 SkipUntil(tok::semi); 609 return 0; 610 } 611 612 ExprResult AssertMessage(ParseStringLiteralExpression()); 613 if (AssertMessage.isInvalid()) 614 return 0; 615 616 T.consumeClose(); 617 618 DeclEnd = Tok.getLocation(); 619 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 620 621 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 622 AssertExpr.take(), 623 AssertMessage.take(), 624 T.getCloseLocation()); 625} 626 627/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 628/// 629/// 'decltype' ( expression ) 630/// 631void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 632 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 633 634 SourceLocation StartLoc = ConsumeToken(); 635 BalancedDelimiterTracker T(*this, tok::l_paren); 636 if (T.expectAndConsume(diag::err_expected_lparen_after, 637 "decltype", tok::r_paren)) { 638 return; 639 } 640 641 // Parse the expression 642 643 // C++0x [dcl.type.simple]p4: 644 // The operand of the decltype specifier is an unevaluated operand. 645 EnterExpressionEvaluationContext Unevaluated(Actions, 646 Sema::Unevaluated); 647 ExprResult Result = ParseExpression(); 648 if (Result.isInvalid()) { 649 SkipUntil(tok::r_paren); 650 return; 651 } 652 653 // Match the ')' 654 T.consumeClose(); 655 if (T.getCloseLocation().isInvalid()) 656 return; 657 658 const char *PrevSpec = 0; 659 unsigned DiagID; 660 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 661 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 662 DiagID, Result.release())) 663 Diag(StartLoc, DiagID) << PrevSpec; 664} 665 666void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 667 assert(Tok.is(tok::kw___underlying_type) && 668 "Not an underlying type specifier"); 669 670 SourceLocation StartLoc = ConsumeToken(); 671 BalancedDelimiterTracker T(*this, tok::l_paren); 672 if (T.expectAndConsume(diag::err_expected_lparen_after, 673 "__underlying_type", tok::r_paren)) { 674 return; 675 } 676 677 TypeResult Result = ParseTypeName(); 678 if (Result.isInvalid()) { 679 SkipUntil(tok::r_paren); 680 return; 681 } 682 683 // Match the ')' 684 T.consumeClose(); 685 if (T.getCloseLocation().isInvalid()) 686 return; 687 688 const char *PrevSpec = 0; 689 unsigned DiagID; 690 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 691 DiagID, Result.release())) 692 Diag(StartLoc, DiagID) << PrevSpec; 693} 694 695/// ParseClassName - Parse a C++ class-name, which names a class. Note 696/// that we only check that the result names a type; semantic analysis 697/// will need to verify that the type names a class. The result is 698/// either a type or NULL, depending on whether a type name was 699/// found. 700/// 701/// class-name: [C++ 9.1] 702/// identifier 703/// simple-template-id 704/// 705Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 706 CXXScopeSpec &SS) { 707 // Check whether we have a template-id that names a type. 708 if (Tok.is(tok::annot_template_id)) { 709 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 710 if (TemplateId->Kind == TNK_Type_template || 711 TemplateId->Kind == TNK_Dependent_template_name) { 712 AnnotateTemplateIdTokenAsType(); 713 714 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 715 ParsedType Type = getTypeAnnotation(Tok); 716 EndLocation = Tok.getAnnotationEndLoc(); 717 ConsumeToken(); 718 719 if (Type) 720 return Type; 721 return true; 722 } 723 724 // Fall through to produce an error below. 725 } 726 727 if (Tok.isNot(tok::identifier)) { 728 Diag(Tok, diag::err_expected_class_name); 729 return true; 730 } 731 732 IdentifierInfo *Id = Tok.getIdentifierInfo(); 733 SourceLocation IdLoc = ConsumeToken(); 734 735 if (Tok.is(tok::less)) { 736 // It looks the user intended to write a template-id here, but the 737 // template-name was wrong. Try to fix that. 738 TemplateNameKind TNK = TNK_Type_template; 739 TemplateTy Template; 740 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 741 &SS, Template, TNK)) { 742 Diag(IdLoc, diag::err_unknown_template_name) 743 << Id; 744 } 745 746 if (!Template) 747 return true; 748 749 // Form the template name 750 UnqualifiedId TemplateName; 751 TemplateName.setIdentifier(Id, IdLoc); 752 753 // Parse the full template-id, then turn it into a type. 754 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 755 SourceLocation(), true)) 756 return true; 757 if (TNK == TNK_Dependent_template_name) 758 AnnotateTemplateIdTokenAsType(); 759 760 // If we didn't end up with a typename token, there's nothing more we 761 // can do. 762 if (Tok.isNot(tok::annot_typename)) 763 return true; 764 765 // Retrieve the type from the annotation token, consume that token, and 766 // return. 767 EndLocation = Tok.getAnnotationEndLoc(); 768 ParsedType Type = getTypeAnnotation(Tok); 769 ConsumeToken(); 770 return Type; 771 } 772 773 // We have an identifier; check whether it is actually a type. 774 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 775 false, ParsedType(), 776 /*NonTrivialTypeSourceInfo=*/true); 777 if (!Type) { 778 Diag(IdLoc, diag::err_expected_class_name); 779 return true; 780 } 781 782 // Consume the identifier. 783 EndLocation = IdLoc; 784 785 // Fake up a Declarator to use with ActOnTypeName. 786 DeclSpec DS(AttrFactory); 787 DS.SetRangeStart(IdLoc); 788 DS.SetRangeEnd(EndLocation); 789 DS.getTypeSpecScope() = SS; 790 791 const char *PrevSpec = 0; 792 unsigned DiagID; 793 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 794 795 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 796 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 797} 798 799/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 800/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 801/// until we reach the start of a definition or see a token that 802/// cannot start a definition. If SuppressDeclarations is true, we do know. 803/// 804/// class-specifier: [C++ class] 805/// class-head '{' member-specification[opt] '}' 806/// class-head '{' member-specification[opt] '}' attributes[opt] 807/// class-head: 808/// class-key identifier[opt] base-clause[opt] 809/// class-key nested-name-specifier identifier base-clause[opt] 810/// class-key nested-name-specifier[opt] simple-template-id 811/// base-clause[opt] 812/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 813/// [GNU] class-key attributes[opt] nested-name-specifier 814/// identifier base-clause[opt] 815/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 816/// simple-template-id base-clause[opt] 817/// class-key: 818/// 'class' 819/// 'struct' 820/// 'union' 821/// 822/// elaborated-type-specifier: [C++ dcl.type.elab] 823/// class-key ::[opt] nested-name-specifier[opt] identifier 824/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 825/// simple-template-id 826/// 827/// Note that the C++ class-specifier and elaborated-type-specifier, 828/// together, subsume the C99 struct-or-union-specifier: 829/// 830/// struct-or-union-specifier: [C99 6.7.2.1] 831/// struct-or-union identifier[opt] '{' struct-contents '}' 832/// struct-or-union identifier 833/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 834/// '}' attributes[opt] 835/// [GNU] struct-or-union attributes[opt] identifier 836/// struct-or-union: 837/// 'struct' 838/// 'union' 839void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 840 SourceLocation StartLoc, DeclSpec &DS, 841 const ParsedTemplateInfo &TemplateInfo, 842 AccessSpecifier AS, bool SuppressDeclarations){ 843 DeclSpec::TST TagType; 844 if (TagTokKind == tok::kw_struct) 845 TagType = DeclSpec::TST_struct; 846 else if (TagTokKind == tok::kw_class) 847 TagType = DeclSpec::TST_class; 848 else { 849 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 850 TagType = DeclSpec::TST_union; 851 } 852 853 if (Tok.is(tok::code_completion)) { 854 // Code completion for a struct, class, or union name. 855 Actions.CodeCompleteTag(getCurScope(), TagType); 856 return cutOffParsing(); 857 } 858 859 // C++03 [temp.explicit] 14.7.2/8: 860 // The usual access checking rules do not apply to names used to specify 861 // explicit instantiations. 862 // 863 // As an extension we do not perform access checking on the names used to 864 // specify explicit specializations either. This is important to allow 865 // specializing traits classes for private types. 866 bool SuppressingAccessChecks = false; 867 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 868 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 869 Actions.ActOnStartSuppressingAccessChecks(); 870 SuppressingAccessChecks = true; 871 } 872 873 ParsedAttributes attrs(AttrFactory); 874 // If attributes exist after tag, parse them. 875 if (Tok.is(tok::kw___attribute)) 876 ParseGNUAttributes(attrs); 877 878 // If declspecs exist after tag, parse them. 879 while (Tok.is(tok::kw___declspec)) 880 ParseMicrosoftDeclSpec(attrs); 881 882 // If C++0x attributes exist here, parse them. 883 // FIXME: Are we consistent with the ordering of parsing of different 884 // styles of attributes? 885 MaybeParseCXX0XAttributes(attrs); 886 887 if (TagType == DeclSpec::TST_struct && 888 !Tok.is(tok::identifier) && 889 Tok.getIdentifierInfo() && 890 (Tok.is(tok::kw___is_arithmetic) || 891 Tok.is(tok::kw___is_convertible) || 892 Tok.is(tok::kw___is_empty) || 893 Tok.is(tok::kw___is_floating_point) || 894 Tok.is(tok::kw___is_function) || 895 Tok.is(tok::kw___is_fundamental) || 896 Tok.is(tok::kw___is_integral) || 897 Tok.is(tok::kw___is_member_function_pointer) || 898 Tok.is(tok::kw___is_member_pointer) || 899 Tok.is(tok::kw___is_pod) || 900 Tok.is(tok::kw___is_pointer) || 901 Tok.is(tok::kw___is_same) || 902 Tok.is(tok::kw___is_scalar) || 903 Tok.is(tok::kw___is_signed) || 904 Tok.is(tok::kw___is_unsigned) || 905 Tok.is(tok::kw___is_void))) { 906 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 907 // name of struct templates, but some are keywords in GCC >= 4.3 908 // and Clang. Therefore, when we see the token sequence "struct 909 // X", make X into a normal identifier rather than a keyword, to 910 // allow libstdc++ 4.2 and libc++ to work properly. 911 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 912 Tok.setKind(tok::identifier); 913 } 914 915 // Parse the (optional) nested-name-specifier. 916 CXXScopeSpec &SS = DS.getTypeSpecScope(); 917 if (getLang().CPlusPlus) { 918 // "FOO : BAR" is not a potential typo for "FOO::BAR". 919 ColonProtectionRAIIObject X(*this); 920 921 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 922 DS.SetTypeSpecError(); 923 if (SS.isSet()) 924 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 925 Diag(Tok, diag::err_expected_ident); 926 } 927 928 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 929 930 // Parse the (optional) class name or simple-template-id. 931 IdentifierInfo *Name = 0; 932 SourceLocation NameLoc; 933 TemplateIdAnnotation *TemplateId = 0; 934 if (Tok.is(tok::identifier)) { 935 Name = Tok.getIdentifierInfo(); 936 NameLoc = ConsumeToken(); 937 938 if (Tok.is(tok::less) && getLang().CPlusPlus) { 939 // The name was supposed to refer to a template, but didn't. 940 // Eat the template argument list and try to continue parsing this as 941 // a class (or template thereof). 942 TemplateArgList TemplateArgs; 943 SourceLocation LAngleLoc, RAngleLoc; 944 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 945 true, LAngleLoc, 946 TemplateArgs, RAngleLoc)) { 947 // We couldn't parse the template argument list at all, so don't 948 // try to give any location information for the list. 949 LAngleLoc = RAngleLoc = SourceLocation(); 950 } 951 952 Diag(NameLoc, diag::err_explicit_spec_non_template) 953 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 954 << (TagType == DeclSpec::TST_class? 0 955 : TagType == DeclSpec::TST_struct? 1 956 : 2) 957 << Name 958 << SourceRange(LAngleLoc, RAngleLoc); 959 960 // Strip off the last template parameter list if it was empty, since 961 // we've removed its template argument list. 962 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 963 if (TemplateParams && TemplateParams->size() > 1) { 964 TemplateParams->pop_back(); 965 } else { 966 TemplateParams = 0; 967 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 968 = ParsedTemplateInfo::NonTemplate; 969 } 970 } else if (TemplateInfo.Kind 971 == ParsedTemplateInfo::ExplicitInstantiation) { 972 // Pretend this is just a forward declaration. 973 TemplateParams = 0; 974 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 975 = ParsedTemplateInfo::NonTemplate; 976 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 977 = SourceLocation(); 978 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 979 = SourceLocation(); 980 } 981 } 982 } else if (Tok.is(tok::annot_template_id)) { 983 TemplateId = takeTemplateIdAnnotation(Tok); 984 NameLoc = ConsumeToken(); 985 986 if (TemplateId->Kind != TNK_Type_template && 987 TemplateId->Kind != TNK_Dependent_template_name) { 988 // The template-name in the simple-template-id refers to 989 // something other than a class template. Give an appropriate 990 // error message and skip to the ';'. 991 SourceRange Range(NameLoc); 992 if (SS.isNotEmpty()) 993 Range.setBegin(SS.getBeginLoc()); 994 995 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 996 << Name << static_cast<int>(TemplateId->Kind) << Range; 997 998 DS.SetTypeSpecError(); 999 SkipUntil(tok::semi, false, true); 1000 if (SuppressingAccessChecks) 1001 Actions.ActOnStopSuppressingAccessChecks(); 1002 1003 return; 1004 } 1005 } 1006 1007 // As soon as we're finished parsing the class's template-id, turn access 1008 // checking back on. 1009 if (SuppressingAccessChecks) 1010 Actions.ActOnStopSuppressingAccessChecks(); 1011 1012 // There are four options here. If we have 'struct foo;', then this 1013 // is either a forward declaration or a friend declaration, which 1014 // have to be treated differently. If we have 'struct foo {...', 1015 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1016 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1017 // However, in some contexts, things look like declarations but are just 1018 // references, e.g. 1019 // new struct s; 1020 // or 1021 // &T::operator struct s; 1022 // For these, SuppressDeclarations is true. 1023 Sema::TagUseKind TUK; 1024 if (SuppressDeclarations) 1025 TUK = Sema::TUK_Reference; 1026 else if (Tok.is(tok::l_brace) || 1027 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1028 isCXX0XFinalKeyword()) { 1029 if (DS.isFriendSpecified()) { 1030 // C++ [class.friend]p2: 1031 // A class shall not be defined in a friend declaration. 1032 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1033 << SourceRange(DS.getFriendSpecLoc()); 1034 1035 // Skip everything up to the semicolon, so that this looks like a proper 1036 // friend class (or template thereof) declaration. 1037 SkipUntil(tok::semi, true, true); 1038 TUK = Sema::TUK_Friend; 1039 } else { 1040 // Okay, this is a class definition. 1041 TUK = Sema::TUK_Definition; 1042 } 1043 } else if (Tok.is(tok::semi)) 1044 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1045 else 1046 TUK = Sema::TUK_Reference; 1047 1048 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1049 TUK != Sema::TUK_Definition)) { 1050 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1051 // We have a declaration or reference to an anonymous class. 1052 Diag(StartLoc, diag::err_anon_type_definition) 1053 << DeclSpec::getSpecifierName(TagType); 1054 } 1055 1056 SkipUntil(tok::comma, true); 1057 return; 1058 } 1059 1060 // Create the tag portion of the class or class template. 1061 DeclResult TagOrTempResult = true; // invalid 1062 TypeResult TypeResult = true; // invalid 1063 1064 bool Owned = false; 1065 if (TemplateId) { 1066 // Explicit specialization, class template partial specialization, 1067 // or explicit instantiation. 1068 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1069 TemplateId->getTemplateArgs(), 1070 TemplateId->NumArgs); 1071 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1072 TUK == Sema::TUK_Declaration) { 1073 // This is an explicit instantiation of a class template. 1074 TagOrTempResult 1075 = Actions.ActOnExplicitInstantiation(getCurScope(), 1076 TemplateInfo.ExternLoc, 1077 TemplateInfo.TemplateLoc, 1078 TagType, 1079 StartLoc, 1080 SS, 1081 TemplateId->Template, 1082 TemplateId->TemplateNameLoc, 1083 TemplateId->LAngleLoc, 1084 TemplateArgsPtr, 1085 TemplateId->RAngleLoc, 1086 attrs.getList()); 1087 1088 // Friend template-ids are treated as references unless 1089 // they have template headers, in which case they're ill-formed 1090 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1091 // We diagnose this error in ActOnClassTemplateSpecialization. 1092 } else if (TUK == Sema::TUK_Reference || 1093 (TUK == Sema::TUK_Friend && 1094 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1095 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1096 StartLoc, 1097 TemplateId->SS, 1098 TemplateId->Template, 1099 TemplateId->TemplateNameLoc, 1100 TemplateId->LAngleLoc, 1101 TemplateArgsPtr, 1102 TemplateId->RAngleLoc); 1103 } else { 1104 // This is an explicit specialization or a class template 1105 // partial specialization. 1106 TemplateParameterLists FakedParamLists; 1107 1108 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1109 // This looks like an explicit instantiation, because we have 1110 // something like 1111 // 1112 // template class Foo<X> 1113 // 1114 // but it actually has a definition. Most likely, this was 1115 // meant to be an explicit specialization, but the user forgot 1116 // the '<>' after 'template'. 1117 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1118 1119 SourceLocation LAngleLoc 1120 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1121 Diag(TemplateId->TemplateNameLoc, 1122 diag::err_explicit_instantiation_with_definition) 1123 << SourceRange(TemplateInfo.TemplateLoc) 1124 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1125 1126 // Create a fake template parameter list that contains only 1127 // "template<>", so that we treat this construct as a class 1128 // template specialization. 1129 FakedParamLists.push_back( 1130 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1131 TemplateInfo.TemplateLoc, 1132 LAngleLoc, 1133 0, 0, 1134 LAngleLoc)); 1135 TemplateParams = &FakedParamLists; 1136 } 1137 1138 // Build the class template specialization. 1139 TagOrTempResult 1140 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1141 StartLoc, DS.getModulePrivateSpecLoc(), SS, 1142 TemplateId->Template, 1143 TemplateId->TemplateNameLoc, 1144 TemplateId->LAngleLoc, 1145 TemplateArgsPtr, 1146 TemplateId->RAngleLoc, 1147 attrs.getList(), 1148 MultiTemplateParamsArg(Actions, 1149 TemplateParams? &(*TemplateParams)[0] : 0, 1150 TemplateParams? TemplateParams->size() : 0)); 1151 } 1152 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1153 TUK == Sema::TUK_Declaration) { 1154 // Explicit instantiation of a member of a class template 1155 // specialization, e.g., 1156 // 1157 // template struct Outer<int>::Inner; 1158 // 1159 TagOrTempResult 1160 = Actions.ActOnExplicitInstantiation(getCurScope(), 1161 TemplateInfo.ExternLoc, 1162 TemplateInfo.TemplateLoc, 1163 TagType, StartLoc, SS, Name, 1164 NameLoc, attrs.getList()); 1165 } else if (TUK == Sema::TUK_Friend && 1166 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1167 TagOrTempResult = 1168 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1169 TagType, StartLoc, SS, 1170 Name, NameLoc, attrs.getList(), 1171 MultiTemplateParamsArg(Actions, 1172 TemplateParams? &(*TemplateParams)[0] : 0, 1173 TemplateParams? TemplateParams->size() : 0)); 1174 } else { 1175 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1176 TUK == Sema::TUK_Definition) { 1177 // FIXME: Diagnose this particular error. 1178 } 1179 1180 bool IsDependent = false; 1181 1182 // Don't pass down template parameter lists if this is just a tag 1183 // reference. For example, we don't need the template parameters here: 1184 // template <class T> class A *makeA(T t); 1185 MultiTemplateParamsArg TParams; 1186 if (TUK != Sema::TUK_Reference && TemplateParams) 1187 TParams = 1188 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1189 1190 // Declaration or definition of a class type 1191 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1192 SS, Name, NameLoc, attrs.getList(), AS, 1193 DS.getModulePrivateSpecLoc(), 1194 TParams, Owned, IsDependent, false, 1195 false, clang::TypeResult()); 1196 1197 // If ActOnTag said the type was dependent, try again with the 1198 // less common call. 1199 if (IsDependent) { 1200 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1201 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1202 SS, Name, StartLoc, NameLoc); 1203 } 1204 } 1205 1206 // If there is a body, parse it and inform the actions module. 1207 if (TUK == Sema::TUK_Definition) { 1208 assert(Tok.is(tok::l_brace) || 1209 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1210 isCXX0XFinalKeyword()); 1211 if (getLang().CPlusPlus) 1212 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1213 else 1214 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1215 } 1216 1217 const char *PrevSpec = 0; 1218 unsigned DiagID; 1219 bool Result; 1220 if (!TypeResult.isInvalid()) { 1221 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1222 NameLoc.isValid() ? NameLoc : StartLoc, 1223 PrevSpec, DiagID, TypeResult.get()); 1224 } else if (!TagOrTempResult.isInvalid()) { 1225 Result = DS.SetTypeSpecType(TagType, StartLoc, 1226 NameLoc.isValid() ? NameLoc : StartLoc, 1227 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1228 } else { 1229 DS.SetTypeSpecError(); 1230 return; 1231 } 1232 1233 if (Result) 1234 Diag(StartLoc, DiagID) << PrevSpec; 1235 1236 // At this point, we've successfully parsed a class-specifier in 'definition' 1237 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1238 // going to look at what comes after it to improve error recovery. If an 1239 // impossible token occurs next, we assume that the programmer forgot a ; at 1240 // the end of the declaration and recover that way. 1241 // 1242 // This switch enumerates the valid "follow" set for definition. 1243 if (TUK == Sema::TUK_Definition) { 1244 bool ExpectedSemi = true; 1245 switch (Tok.getKind()) { 1246 default: break; 1247 case tok::semi: // struct foo {...} ; 1248 case tok::star: // struct foo {...} * P; 1249 case tok::amp: // struct foo {...} & R = ... 1250 case tok::identifier: // struct foo {...} V ; 1251 case tok::r_paren: //(struct foo {...} ) {4} 1252 case tok::annot_cxxscope: // struct foo {...} a:: b; 1253 case tok::annot_typename: // struct foo {...} a ::b; 1254 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1255 case tok::l_paren: // struct foo {...} ( x); 1256 case tok::comma: // __builtin_offsetof(struct foo{...} , 1257 ExpectedSemi = false; 1258 break; 1259 // Type qualifiers 1260 case tok::kw_const: // struct foo {...} const x; 1261 case tok::kw_volatile: // struct foo {...} volatile x; 1262 case tok::kw_restrict: // struct foo {...} restrict x; 1263 case tok::kw_inline: // struct foo {...} inline foo() {}; 1264 // Storage-class specifiers 1265 case tok::kw_static: // struct foo {...} static x; 1266 case tok::kw_extern: // struct foo {...} extern x; 1267 case tok::kw_typedef: // struct foo {...} typedef x; 1268 case tok::kw_register: // struct foo {...} register x; 1269 case tok::kw_auto: // struct foo {...} auto x; 1270 case tok::kw_mutable: // struct foo {...} mutable x; 1271 case tok::kw_constexpr: // struct foo {...} constexpr x; 1272 // As shown above, type qualifiers and storage class specifiers absolutely 1273 // can occur after class specifiers according to the grammar. However, 1274 // almost no one actually writes code like this. If we see one of these, 1275 // it is much more likely that someone missed a semi colon and the 1276 // type/storage class specifier we're seeing is part of the *next* 1277 // intended declaration, as in: 1278 // 1279 // struct foo { ... } 1280 // typedef int X; 1281 // 1282 // We'd really like to emit a missing semicolon error instead of emitting 1283 // an error on the 'int' saying that you can't have two type specifiers in 1284 // the same declaration of X. Because of this, we look ahead past this 1285 // token to see if it's a type specifier. If so, we know the code is 1286 // otherwise invalid, so we can produce the expected semi error. 1287 if (!isKnownToBeTypeSpecifier(NextToken())) 1288 ExpectedSemi = false; 1289 break; 1290 1291 case tok::r_brace: // struct bar { struct foo {...} } 1292 // Missing ';' at end of struct is accepted as an extension in C mode. 1293 if (!getLang().CPlusPlus) 1294 ExpectedSemi = false; 1295 break; 1296 } 1297 1298 // C++ [temp]p3 In a template-declaration which defines a class, no 1299 // declarator is permitted. 1300 if (TemplateInfo.Kind) 1301 ExpectedSemi = true; 1302 1303 if (ExpectedSemi) { 1304 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1305 TagType == DeclSpec::TST_class ? "class" 1306 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1307 // Push this token back into the preprocessor and change our current token 1308 // to ';' so that the rest of the code recovers as though there were an 1309 // ';' after the definition. 1310 PP.EnterToken(Tok); 1311 Tok.setKind(tok::semi); 1312 } 1313 } 1314} 1315 1316/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1317/// 1318/// base-clause : [C++ class.derived] 1319/// ':' base-specifier-list 1320/// base-specifier-list: 1321/// base-specifier '...'[opt] 1322/// base-specifier-list ',' base-specifier '...'[opt] 1323void Parser::ParseBaseClause(Decl *ClassDecl) { 1324 assert(Tok.is(tok::colon) && "Not a base clause"); 1325 ConsumeToken(); 1326 1327 // Build up an array of parsed base specifiers. 1328 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1329 1330 while (true) { 1331 // Parse a base-specifier. 1332 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1333 if (Result.isInvalid()) { 1334 // Skip the rest of this base specifier, up until the comma or 1335 // opening brace. 1336 SkipUntil(tok::comma, tok::l_brace, true, true); 1337 } else { 1338 // Add this to our array of base specifiers. 1339 BaseInfo.push_back(Result.get()); 1340 } 1341 1342 // If the next token is a comma, consume it and keep reading 1343 // base-specifiers. 1344 if (Tok.isNot(tok::comma)) break; 1345 1346 // Consume the comma. 1347 ConsumeToken(); 1348 } 1349 1350 // Attach the base specifiers 1351 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1352} 1353 1354/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1355/// one entry in the base class list of a class specifier, for example: 1356/// class foo : public bar, virtual private baz { 1357/// 'public bar' and 'virtual private baz' are each base-specifiers. 1358/// 1359/// base-specifier: [C++ class.derived] 1360/// ::[opt] nested-name-specifier[opt] class-name 1361/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1362/// class-name 1363/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1364/// class-name 1365Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1366 bool IsVirtual = false; 1367 SourceLocation StartLoc = Tok.getLocation(); 1368 1369 // Parse the 'virtual' keyword. 1370 if (Tok.is(tok::kw_virtual)) { 1371 ConsumeToken(); 1372 IsVirtual = true; 1373 } 1374 1375 // Parse an (optional) access specifier. 1376 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1377 if (Access != AS_none) 1378 ConsumeToken(); 1379 1380 // Parse the 'virtual' keyword (again!), in case it came after the 1381 // access specifier. 1382 if (Tok.is(tok::kw_virtual)) { 1383 SourceLocation VirtualLoc = ConsumeToken(); 1384 if (IsVirtual) { 1385 // Complain about duplicate 'virtual' 1386 Diag(VirtualLoc, diag::err_dup_virtual) 1387 << FixItHint::CreateRemoval(VirtualLoc); 1388 } 1389 1390 IsVirtual = true; 1391 } 1392 1393 // Parse optional '::' and optional nested-name-specifier. 1394 CXXScopeSpec SS; 1395 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1396 1397 // The location of the base class itself. 1398 SourceLocation BaseLoc = Tok.getLocation(); 1399 1400 // Parse the class-name. 1401 SourceLocation EndLocation; 1402 TypeResult BaseType = ParseClassName(EndLocation, SS); 1403 if (BaseType.isInvalid()) 1404 return true; 1405 1406 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1407 // actually part of the base-specifier-list grammar productions, but we 1408 // parse it here for convenience. 1409 SourceLocation EllipsisLoc; 1410 if (Tok.is(tok::ellipsis)) 1411 EllipsisLoc = ConsumeToken(); 1412 1413 // Find the complete source range for the base-specifier. 1414 SourceRange Range(StartLoc, EndLocation); 1415 1416 // Notify semantic analysis that we have parsed a complete 1417 // base-specifier. 1418 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1419 BaseType.get(), BaseLoc, EllipsisLoc); 1420} 1421 1422/// getAccessSpecifierIfPresent - Determine whether the next token is 1423/// a C++ access-specifier. 1424/// 1425/// access-specifier: [C++ class.derived] 1426/// 'private' 1427/// 'protected' 1428/// 'public' 1429AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1430 switch (Tok.getKind()) { 1431 default: return AS_none; 1432 case tok::kw_private: return AS_private; 1433 case tok::kw_protected: return AS_protected; 1434 case tok::kw_public: return AS_public; 1435 } 1436} 1437 1438void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1439 Decl *ThisDecl) { 1440 // We just declared a member function. If this member function 1441 // has any default arguments, we'll need to parse them later. 1442 LateParsedMethodDeclaration *LateMethod = 0; 1443 DeclaratorChunk::FunctionTypeInfo &FTI 1444 = DeclaratorInfo.getFunctionTypeInfo(); 1445 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1446 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1447 if (!LateMethod) { 1448 // Push this method onto the stack of late-parsed method 1449 // declarations. 1450 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1451 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1452 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1453 1454 // Add all of the parameters prior to this one (they don't 1455 // have default arguments). 1456 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1457 for (unsigned I = 0; I < ParamIdx; ++I) 1458 LateMethod->DefaultArgs.push_back( 1459 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1460 } 1461 1462 // Add this parameter to the list of parameters (it or may 1463 // not have a default argument). 1464 LateMethod->DefaultArgs.push_back( 1465 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1466 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1467 } 1468 } 1469} 1470 1471/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1472/// virt-specifier. 1473/// 1474/// virt-specifier: 1475/// override 1476/// final 1477VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1478 if (!getLang().CPlusPlus) 1479 return VirtSpecifiers::VS_None; 1480 1481 if (Tok.is(tok::identifier)) { 1482 IdentifierInfo *II = Tok.getIdentifierInfo(); 1483 1484 // Initialize the contextual keywords. 1485 if (!Ident_final) { 1486 Ident_final = &PP.getIdentifierTable().get("final"); 1487 Ident_override = &PP.getIdentifierTable().get("override"); 1488 } 1489 1490 if (II == Ident_override) 1491 return VirtSpecifiers::VS_Override; 1492 1493 if (II == Ident_final) 1494 return VirtSpecifiers::VS_Final; 1495 } 1496 1497 return VirtSpecifiers::VS_None; 1498} 1499 1500/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1501/// 1502/// virt-specifier-seq: 1503/// virt-specifier 1504/// virt-specifier-seq virt-specifier 1505void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1506 while (true) { 1507 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1508 if (Specifier == VirtSpecifiers::VS_None) 1509 return; 1510 1511 // C++ [class.mem]p8: 1512 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1513 const char *PrevSpec = 0; 1514 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1515 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1516 << PrevSpec 1517 << FixItHint::CreateRemoval(Tok.getLocation()); 1518 1519 if (!getLang().CPlusPlus0x) 1520 Diag(Tok.getLocation(), diag::ext_override_control_keyword) 1521 << VirtSpecifiers::getSpecifierName(Specifier); 1522 ConsumeToken(); 1523 } 1524} 1525 1526/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1527/// contextual 'final' keyword. 1528bool Parser::isCXX0XFinalKeyword() const { 1529 if (!getLang().CPlusPlus) 1530 return false; 1531 1532 if (!Tok.is(tok::identifier)) 1533 return false; 1534 1535 // Initialize the contextual keywords. 1536 if (!Ident_final) { 1537 Ident_final = &PP.getIdentifierTable().get("final"); 1538 Ident_override = &PP.getIdentifierTable().get("override"); 1539 } 1540 1541 return Tok.getIdentifierInfo() == Ident_final; 1542} 1543 1544/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1545/// 1546/// member-declaration: 1547/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1548/// function-definition ';'[opt] 1549/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1550/// using-declaration [TODO] 1551/// [C++0x] static_assert-declaration 1552/// template-declaration 1553/// [GNU] '__extension__' member-declaration 1554/// 1555/// member-declarator-list: 1556/// member-declarator 1557/// member-declarator-list ',' member-declarator 1558/// 1559/// member-declarator: 1560/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1561/// declarator constant-initializer[opt] 1562/// [C++11] declarator brace-or-equal-initializer[opt] 1563/// identifier[opt] ':' constant-expression 1564/// 1565/// virt-specifier-seq: 1566/// virt-specifier 1567/// virt-specifier-seq virt-specifier 1568/// 1569/// virt-specifier: 1570/// override 1571/// final 1572/// 1573/// pure-specifier: 1574/// '= 0' 1575/// 1576/// constant-initializer: 1577/// '=' constant-expression 1578/// 1579void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1580 const ParsedTemplateInfo &TemplateInfo, 1581 ParsingDeclRAIIObject *TemplateDiags) { 1582 if (Tok.is(tok::at)) { 1583 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1584 Diag(Tok, diag::err_at_defs_cxx); 1585 else 1586 Diag(Tok, diag::err_at_in_class); 1587 1588 ConsumeToken(); 1589 SkipUntil(tok::r_brace); 1590 return; 1591 } 1592 1593 // Access declarations. 1594 if (!TemplateInfo.Kind && 1595 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1596 !TryAnnotateCXXScopeToken() && 1597 Tok.is(tok::annot_cxxscope)) { 1598 bool isAccessDecl = false; 1599 if (NextToken().is(tok::identifier)) 1600 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1601 else 1602 isAccessDecl = NextToken().is(tok::kw_operator); 1603 1604 if (isAccessDecl) { 1605 // Collect the scope specifier token we annotated earlier. 1606 CXXScopeSpec SS; 1607 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1608 1609 // Try to parse an unqualified-id. 1610 UnqualifiedId Name; 1611 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1612 SkipUntil(tok::semi); 1613 return; 1614 } 1615 1616 // TODO: recover from mistakenly-qualified operator declarations. 1617 if (ExpectAndConsume(tok::semi, 1618 diag::err_expected_semi_after, 1619 "access declaration", 1620 tok::semi)) 1621 return; 1622 1623 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1624 false, SourceLocation(), 1625 SS, Name, 1626 /* AttrList */ 0, 1627 /* IsTypeName */ false, 1628 SourceLocation()); 1629 return; 1630 } 1631 } 1632 1633 // static_assert-declaration 1634 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1635 // FIXME: Check for templates 1636 SourceLocation DeclEnd; 1637 ParseStaticAssertDeclaration(DeclEnd); 1638 return; 1639 } 1640 1641 if (Tok.is(tok::kw_template)) { 1642 assert(!TemplateInfo.TemplateParams && 1643 "Nested template improperly parsed?"); 1644 SourceLocation DeclEnd; 1645 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1646 AS); 1647 return; 1648 } 1649 1650 // Handle: member-declaration ::= '__extension__' member-declaration 1651 if (Tok.is(tok::kw___extension__)) { 1652 // __extension__ silences extension warnings in the subexpression. 1653 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1654 ConsumeToken(); 1655 return ParseCXXClassMemberDeclaration(AS, TemplateInfo, TemplateDiags); 1656 } 1657 1658 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1659 // is a bitfield. 1660 ColonProtectionRAIIObject X(*this); 1661 1662 ParsedAttributesWithRange attrs(AttrFactory); 1663 // Optional C++0x attribute-specifier 1664 MaybeParseCXX0XAttributes(attrs); 1665 MaybeParseMicrosoftAttributes(attrs); 1666 1667 if (Tok.is(tok::kw_using)) { 1668 ProhibitAttributes(attrs); 1669 1670 // Eat 'using'. 1671 SourceLocation UsingLoc = ConsumeToken(); 1672 1673 if (Tok.is(tok::kw_namespace)) { 1674 Diag(UsingLoc, diag::err_using_namespace_in_class); 1675 SkipUntil(tok::semi, true, true); 1676 } else { 1677 SourceLocation DeclEnd; 1678 // Otherwise, it must be a using-declaration or an alias-declaration. 1679 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1680 UsingLoc, DeclEnd, AS); 1681 } 1682 return; 1683 } 1684 1685 // decl-specifier-seq: 1686 // Parse the common declaration-specifiers piece. 1687 ParsingDeclSpec DS(*this, TemplateDiags); 1688 DS.takeAttributesFrom(attrs); 1689 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1690 1691 MultiTemplateParamsArg TemplateParams(Actions, 1692 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1693 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1694 1695 if (Tok.is(tok::semi)) { 1696 ConsumeToken(); 1697 Decl *TheDecl = 1698 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1699 DS.complete(TheDecl); 1700 return; 1701 } 1702 1703 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1704 VirtSpecifiers VS; 1705 1706 // Hold late-parsed attributes so we can attach a Decl to them later. 1707 LateParsedAttrList LateParsedAttrs; 1708 1709 if (Tok.isNot(tok::colon)) { 1710 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1711 ColonProtectionRAIIObject X(*this); 1712 1713 // Parse the first declarator. 1714 ParseDeclarator(DeclaratorInfo); 1715 // Error parsing the declarator? 1716 if (!DeclaratorInfo.hasName()) { 1717 // If so, skip until the semi-colon or a }. 1718 SkipUntil(tok::r_brace, true, true); 1719 if (Tok.is(tok::semi)) 1720 ConsumeToken(); 1721 return; 1722 } 1723 1724 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1725 1726 // If attributes exist after the declarator, but before an '{', parse them. 1727 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1728 1729 // MSVC permits pure specifier on inline functions declared at class scope. 1730 // Hence check for =0 before checking for function definition. 1731 ExprResult Init; 1732 if (getLang().MicrosoftExt && Tok.is(tok::equal) && 1733 DeclaratorInfo.isFunctionDeclarator() && 1734 NextToken().is(tok::numeric_constant)) { 1735 ConsumeToken(); 1736 Init = ParseInitializer(); 1737 if (Init.isInvalid()) 1738 SkipUntil(tok::comma, true, true); 1739 } 1740 1741 bool IsDefinition = false; 1742 // function-definition: 1743 // 1744 // In C++11, a non-function declarator followed by an open brace is a 1745 // braced-init-list for an in-class member initialization, not an 1746 // erroneous function definition. 1747 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1748 IsDefinition = true; 1749 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1750 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1751 IsDefinition = true; 1752 } else if (Tok.is(tok::equal)) { 1753 const Token &KW = NextToken(); 1754 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1755 IsDefinition = true; 1756 } 1757 } 1758 1759 if (IsDefinition) { 1760 if (!DeclaratorInfo.isFunctionDeclarator()) { 1761 Diag(Tok, diag::err_func_def_no_params); 1762 ConsumeBrace(); 1763 SkipUntil(tok::r_brace, true); 1764 1765 // Consume the optional ';' 1766 if (Tok.is(tok::semi)) 1767 ConsumeToken(); 1768 return; 1769 } 1770 1771 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1772 Diag(Tok, diag::err_function_declared_typedef); 1773 // This recovery skips the entire function body. It would be nice 1774 // to simply call ParseCXXInlineMethodDef() below, however Sema 1775 // assumes the declarator represents a function, not a typedef. 1776 ConsumeBrace(); 1777 SkipUntil(tok::r_brace, true); 1778 1779 // Consume the optional ';' 1780 if (Tok.is(tok::semi)) 1781 ConsumeToken(); 1782 return; 1783 } 1784 1785 Decl *FunDecl = 1786 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo, VS, Init); 1787 1788 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1789 LateParsedAttrs[i]->setDecl(FunDecl); 1790 } 1791 LateParsedAttrs.clear(); 1792 1793 // Consume the ';' - it's optional unless we have a delete or default 1794 if (Tok.is(tok::semi)) { 1795 ConsumeToken(); 1796 } 1797 1798 return; 1799 } 1800 } 1801 1802 // member-declarator-list: 1803 // member-declarator 1804 // member-declarator-list ',' member-declarator 1805 1806 SmallVector<Decl *, 8> DeclsInGroup; 1807 ExprResult BitfieldSize; 1808 1809 while (1) { 1810 // member-declarator: 1811 // declarator pure-specifier[opt] 1812 // declarator brace-or-equal-initializer[opt] 1813 // identifier[opt] ':' constant-expression 1814 if (Tok.is(tok::colon)) { 1815 ConsumeToken(); 1816 BitfieldSize = ParseConstantExpression(); 1817 if (BitfieldSize.isInvalid()) 1818 SkipUntil(tok::comma, true, true); 1819 } 1820 1821 // If a simple-asm-expr is present, parse it. 1822 if (Tok.is(tok::kw_asm)) { 1823 SourceLocation Loc; 1824 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1825 if (AsmLabel.isInvalid()) 1826 SkipUntil(tok::comma, true, true); 1827 1828 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1829 DeclaratorInfo.SetRangeEnd(Loc); 1830 } 1831 1832 // If attributes exist after the declarator, parse them. 1833 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1834 1835 // FIXME: When g++ adds support for this, we'll need to check whether it 1836 // goes before or after the GNU attributes and __asm__. 1837 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1838 1839 bool HasInitializer = false; 1840 bool HasDeferredInitializer = false; 1841 if (Tok.is(tok::equal) || Tok.is(tok::l_brace)) { 1842 if (BitfieldSize.get()) { 1843 Diag(Tok, diag::err_bitfield_member_init); 1844 SkipUntil(tok::comma, true, true); 1845 } else { 1846 HasInitializer = true; 1847 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1848 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1849 != DeclSpec::SCS_static && 1850 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1851 != DeclSpec::SCS_typedef; 1852 } 1853 } 1854 1855 // NOTE: If Sema is the Action module and declarator is an instance field, 1856 // this call will *not* return the created decl; It will return null. 1857 // See Sema::ActOnCXXMemberDeclarator for details. 1858 1859 Decl *ThisDecl = 0; 1860 if (DS.isFriendSpecified()) { 1861 // TODO: handle initializers, bitfields, 'delete' 1862 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1863 move(TemplateParams)); 1864 } else { 1865 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1866 DeclaratorInfo, 1867 move(TemplateParams), 1868 BitfieldSize.release(), 1869 VS, HasDeferredInitializer); 1870 } 1871 1872 // Set the Decl for any late parsed attributes 1873 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1874 LateParsedAttrs[i]->setDecl(ThisDecl); 1875 } 1876 LateParsedAttrs.clear(); 1877 1878 // Handle the initializer. 1879 if (HasDeferredInitializer) { 1880 // The initializer was deferred; parse it and cache the tokens. 1881 if (!getLang().CPlusPlus0x) 1882 Diag(Tok, diag::warn_nonstatic_member_init_accepted_as_extension); 1883 1884 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1885 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1886 // declarator is followed by an initializer. 1887 // 1888 // A brace-or-equal-initializer for a member-declarator is not an 1889 // initializer in the gramamr, so this is ill-formed. 1890 Diag(Tok, diag::err_incomplete_array_member_init); 1891 SkipUntil(tok::comma, true, true); 1892 // Avoid later warnings about a class member of incomplete type. 1893 ThisDecl->setInvalidDecl(); 1894 } else 1895 ParseCXXNonStaticMemberInitializer(ThisDecl); 1896 } else if (HasInitializer) { 1897 // Normal initializer. 1898 SourceLocation EqualLoc; 1899 ExprResult Init 1900 = ParseCXXMemberInitializer(DeclaratorInfo.isDeclarationOfFunction(), 1901 EqualLoc); 1902 if (Init.isInvalid()) 1903 SkipUntil(tok::comma, true, true); 1904 else if (ThisDecl) 1905 Actions.AddInitializerToDecl(ThisDecl, Init.get(), false, 1906 DS.getTypeSpecType() == DeclSpec::TST_auto); 1907 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1908 // No initializer. 1909 Actions.ActOnUninitializedDecl(ThisDecl, 1910 DS.getTypeSpecType() == DeclSpec::TST_auto); 1911 } 1912 1913 if (ThisDecl) { 1914 Actions.FinalizeDeclaration(ThisDecl); 1915 DeclsInGroup.push_back(ThisDecl); 1916 } 1917 1918 if (DeclaratorInfo.isFunctionDeclarator() && 1919 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1920 != DeclSpec::SCS_typedef) { 1921 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1922 } 1923 1924 DeclaratorInfo.complete(ThisDecl); 1925 1926 // If we don't have a comma, it is either the end of the list (a ';') 1927 // or an error, bail out. 1928 if (Tok.isNot(tok::comma)) 1929 break; 1930 1931 // Consume the comma. 1932 ConsumeToken(); 1933 1934 // Parse the next declarator. 1935 DeclaratorInfo.clear(); 1936 VS.clear(); 1937 BitfieldSize = true; 1938 1939 // Attributes are only allowed on the second declarator. 1940 MaybeParseGNUAttributes(DeclaratorInfo); 1941 1942 if (Tok.isNot(tok::colon)) 1943 ParseDeclarator(DeclaratorInfo); 1944 } 1945 1946 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1947 // Skip to end of block or statement. 1948 SkipUntil(tok::r_brace, true, true); 1949 // If we stopped at a ';', eat it. 1950 if (Tok.is(tok::semi)) ConsumeToken(); 1951 return; 1952 } 1953 1954 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1955 DeclsInGroup.size()); 1956} 1957 1958/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1959/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1960/// function definition. The location of the '=', if any, will be placed in 1961/// EqualLoc. 1962/// 1963/// pure-specifier: 1964/// '= 0' 1965/// 1966/// brace-or-equal-initializer: 1967/// '=' initializer-expression 1968/// braced-init-list [TODO] 1969/// 1970/// initializer-clause: 1971/// assignment-expression 1972/// braced-init-list [TODO] 1973/// 1974/// defaulted/deleted function-definition: 1975/// '=' 'default' 1976/// '=' 'delete' 1977/// 1978/// Prior to C++0x, the assignment-expression in an initializer-clause must 1979/// be a constant-expression. 1980ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1981 SourceLocation &EqualLoc) { 1982 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 1983 && "Data member initializer not starting with '=' or '{'"); 1984 1985 if (Tok.is(tok::equal)) { 1986 EqualLoc = ConsumeToken(); 1987 if (Tok.is(tok::kw_delete)) { 1988 // In principle, an initializer of '= delete p;' is legal, but it will 1989 // never type-check. It's better to diagnose it as an ill-formed expression 1990 // than as an ill-formed deleted non-function member. 1991 // An initializer of '= delete p, foo' will never be parsed, because 1992 // a top-level comma always ends the initializer expression. 1993 const Token &Next = NextToken(); 1994 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 1995 Next.is(tok::eof)) { 1996 if (IsFunction) 1997 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1998 << 1 /* delete */; 1999 else 2000 Diag(ConsumeToken(), diag::err_deleted_non_function); 2001 return ExprResult(); 2002 } 2003 } else if (Tok.is(tok::kw_default)) { 2004 if (IsFunction) 2005 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2006 << 0 /* default */; 2007 else 2008 Diag(ConsumeToken(), diag::err_default_special_members); 2009 return ExprResult(); 2010 } 2011 2012 return ParseInitializer(); 2013 } else 2014 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 2015} 2016 2017/// ParseCXXMemberSpecification - Parse the class definition. 2018/// 2019/// member-specification: 2020/// member-declaration member-specification[opt] 2021/// access-specifier ':' member-specification[opt] 2022/// 2023void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2024 unsigned TagType, Decl *TagDecl) { 2025 assert((TagType == DeclSpec::TST_struct || 2026 TagType == DeclSpec::TST_union || 2027 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2028 2029 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2030 "parsing struct/union/class body"); 2031 2032 // Determine whether this is a non-nested class. Note that local 2033 // classes are *not* considered to be nested classes. 2034 bool NonNestedClass = true; 2035 if (!ClassStack.empty()) { 2036 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2037 if (S->isClassScope()) { 2038 // We're inside a class scope, so this is a nested class. 2039 NonNestedClass = false; 2040 break; 2041 } 2042 2043 if ((S->getFlags() & Scope::FnScope)) { 2044 // If we're in a function or function template declared in the 2045 // body of a class, then this is a local class rather than a 2046 // nested class. 2047 const Scope *Parent = S->getParent(); 2048 if (Parent->isTemplateParamScope()) 2049 Parent = Parent->getParent(); 2050 if (Parent->isClassScope()) 2051 break; 2052 } 2053 } 2054 } 2055 2056 // Enter a scope for the class. 2057 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2058 2059 // Note that we are parsing a new (potentially-nested) class definition. 2060 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2061 2062 if (TagDecl) 2063 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2064 2065 SourceLocation FinalLoc; 2066 2067 // Parse the optional 'final' keyword. 2068 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2069 IdentifierInfo *II = Tok.getIdentifierInfo(); 2070 2071 // Initialize the contextual keywords. 2072 if (!Ident_final) { 2073 Ident_final = &PP.getIdentifierTable().get("final"); 2074 Ident_override = &PP.getIdentifierTable().get("override"); 2075 } 2076 2077 if (II == Ident_final) 2078 FinalLoc = ConsumeToken(); 2079 2080 if (!getLang().CPlusPlus0x) 2081 Diag(FinalLoc, diag::ext_override_control_keyword) << "final"; 2082 } 2083 2084 if (Tok.is(tok::colon)) { 2085 ParseBaseClause(TagDecl); 2086 2087 if (!Tok.is(tok::l_brace)) { 2088 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2089 2090 if (TagDecl) 2091 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2092 return; 2093 } 2094 } 2095 2096 assert(Tok.is(tok::l_brace)); 2097 BalancedDelimiterTracker T(*this, tok::l_brace); 2098 T.consumeOpen(); 2099 2100 if (TagDecl) 2101 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2102 T.getOpenLocation()); 2103 2104 // C++ 11p3: Members of a class defined with the keyword class are private 2105 // by default. Members of a class defined with the keywords struct or union 2106 // are public by default. 2107 AccessSpecifier CurAS; 2108 if (TagType == DeclSpec::TST_class) 2109 CurAS = AS_private; 2110 else 2111 CurAS = AS_public; 2112 2113 if (TagDecl) { 2114 // While we still have something to read, read the member-declarations. 2115 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2116 // Each iteration of this loop reads one member-declaration. 2117 2118 if (getLang().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2119 Tok.is(tok::kw___if_not_exists))) { 2120 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2121 continue; 2122 } 2123 2124 // Check for extraneous top-level semicolon. 2125 if (Tok.is(tok::semi)) { 2126 Diag(Tok, diag::ext_extra_struct_semi) 2127 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2128 << FixItHint::CreateRemoval(Tok.getLocation()); 2129 ConsumeToken(); 2130 continue; 2131 } 2132 2133 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2134 if (AS != AS_none) { 2135 // Current token is a C++ access specifier. 2136 CurAS = AS; 2137 SourceLocation ASLoc = Tok.getLocation(); 2138 ConsumeToken(); 2139 if (Tok.is(tok::colon)) 2140 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2141 else 2142 Diag(Tok, diag::err_expected_colon); 2143 ConsumeToken(); 2144 continue; 2145 } 2146 2147 // FIXME: Make sure we don't have a template here. 2148 2149 // Parse all the comma separated declarators. 2150 ParseCXXClassMemberDeclaration(CurAS); 2151 } 2152 2153 T.consumeClose(); 2154 } else { 2155 SkipUntil(tok::r_brace, false, false); 2156 } 2157 2158 // If attributes exist after class contents, parse them. 2159 ParsedAttributes attrs(AttrFactory); 2160 MaybeParseGNUAttributes(attrs); 2161 2162 if (TagDecl) 2163 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2164 T.getOpenLocation(), 2165 T.getCloseLocation(), 2166 attrs.getList()); 2167 2168 // C++0x [class.mem]p2: Within the class member-specification, the class is 2169 // regarded as complete within function bodies, default arguments, exception- 2170 // specifications, and brace-or-equal-initializers for non-static data 2171 // members (including such things in nested classes). 2172 // 2173 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2174 // handled. Fix the others! 2175 if (TagDecl && NonNestedClass) { 2176 // We are not inside a nested class. This class and its nested classes 2177 // are complete and we can parse the delayed portions of method 2178 // declarations and the lexed inline method definitions, along with any 2179 // delayed attributes. 2180 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2181 ParseLexedAttributes(getCurrentClass()); 2182 ParseLexedMethodDeclarations(getCurrentClass()); 2183 ParseLexedMemberInitializers(getCurrentClass()); 2184 ParseLexedMethodDefs(getCurrentClass()); 2185 PrevTokLocation = SavedPrevTokLocation; 2186 } 2187 2188 if (TagDecl) 2189 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 2190 T.getCloseLocation()); 2191 2192 // Leave the class scope. 2193 ParsingDef.Pop(); 2194 ClassScope.Exit(); 2195} 2196 2197/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2198/// which explicitly initializes the members or base classes of a 2199/// class (C++ [class.base.init]). For example, the three initializers 2200/// after the ':' in the Derived constructor below: 2201/// 2202/// @code 2203/// class Base { }; 2204/// class Derived : Base { 2205/// int x; 2206/// float f; 2207/// public: 2208/// Derived(float f) : Base(), x(17), f(f) { } 2209/// }; 2210/// @endcode 2211/// 2212/// [C++] ctor-initializer: 2213/// ':' mem-initializer-list 2214/// 2215/// [C++] mem-initializer-list: 2216/// mem-initializer ...[opt] 2217/// mem-initializer ...[opt] , mem-initializer-list 2218void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2219 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2220 2221 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2222 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2223 SourceLocation ColonLoc = ConsumeToken(); 2224 2225 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2226 bool AnyErrors = false; 2227 2228 do { 2229 if (Tok.is(tok::code_completion)) { 2230 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2231 MemInitializers.data(), 2232 MemInitializers.size()); 2233 return cutOffParsing(); 2234 } else { 2235 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2236 if (!MemInit.isInvalid()) 2237 MemInitializers.push_back(MemInit.get()); 2238 else 2239 AnyErrors = true; 2240 } 2241 2242 if (Tok.is(tok::comma)) 2243 ConsumeToken(); 2244 else if (Tok.is(tok::l_brace)) 2245 break; 2246 // If the next token looks like a base or member initializer, assume that 2247 // we're just missing a comma. 2248 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2249 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2250 Diag(Loc, diag::err_ctor_init_missing_comma) 2251 << FixItHint::CreateInsertion(Loc, ", "); 2252 } else { 2253 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2254 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2255 SkipUntil(tok::l_brace, true, true); 2256 break; 2257 } 2258 } while (true); 2259 2260 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2261 MemInitializers.data(), MemInitializers.size(), 2262 AnyErrors); 2263} 2264 2265/// ParseMemInitializer - Parse a C++ member initializer, which is 2266/// part of a constructor initializer that explicitly initializes one 2267/// member or base class (C++ [class.base.init]). See 2268/// ParseConstructorInitializer for an example. 2269/// 2270/// [C++] mem-initializer: 2271/// mem-initializer-id '(' expression-list[opt] ')' 2272/// [C++0x] mem-initializer-id braced-init-list 2273/// 2274/// [C++] mem-initializer-id: 2275/// '::'[opt] nested-name-specifier[opt] class-name 2276/// identifier 2277Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2278 // parse '::'[opt] nested-name-specifier[opt] 2279 CXXScopeSpec SS; 2280 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2281 ParsedType TemplateTypeTy; 2282 if (Tok.is(tok::annot_template_id)) { 2283 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2284 if (TemplateId->Kind == TNK_Type_template || 2285 TemplateId->Kind == TNK_Dependent_template_name) { 2286 AnnotateTemplateIdTokenAsType(); 2287 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2288 TemplateTypeTy = getTypeAnnotation(Tok); 2289 } 2290 } 2291 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2292 Diag(Tok, diag::err_expected_member_or_base_name); 2293 return true; 2294 } 2295 2296 // Get the identifier. This may be a member name or a class name, 2297 // but we'll let the semantic analysis determine which it is. 2298 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2299 SourceLocation IdLoc = ConsumeToken(); 2300 2301 // Parse the '('. 2302 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2303 ExprResult InitList = ParseBraceInitializer(); 2304 if (InitList.isInvalid()) 2305 return true; 2306 2307 SourceLocation EllipsisLoc; 2308 if (Tok.is(tok::ellipsis)) 2309 EllipsisLoc = ConsumeToken(); 2310 2311 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2312 TemplateTypeTy, IdLoc, InitList.take(), 2313 EllipsisLoc); 2314 } else if(Tok.is(tok::l_paren)) { 2315 BalancedDelimiterTracker T(*this, tok::l_paren); 2316 T.consumeOpen(); 2317 2318 // Parse the optional expression-list. 2319 ExprVector ArgExprs(Actions); 2320 CommaLocsTy CommaLocs; 2321 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2322 SkipUntil(tok::r_paren); 2323 return true; 2324 } 2325 2326 T.consumeClose(); 2327 2328 SourceLocation EllipsisLoc; 2329 if (Tok.is(tok::ellipsis)) 2330 EllipsisLoc = ConsumeToken(); 2331 2332 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2333 TemplateTypeTy, IdLoc, 2334 T.getOpenLocation(), ArgExprs.take(), 2335 ArgExprs.size(), T.getCloseLocation(), 2336 EllipsisLoc); 2337 } 2338 2339 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2340 : diag::err_expected_lparen); 2341 return true; 2342} 2343 2344/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2345/// 2346/// exception-specification: 2347/// dynamic-exception-specification 2348/// noexcept-specification 2349/// 2350/// noexcept-specification: 2351/// 'noexcept' 2352/// 'noexcept' '(' constant-expression ')' 2353ExceptionSpecificationType 2354Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2355 SmallVectorImpl<ParsedType> &DynamicExceptions, 2356 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2357 ExprResult &NoexceptExpr) { 2358 ExceptionSpecificationType Result = EST_None; 2359 2360 // See if there's a dynamic specification. 2361 if (Tok.is(tok::kw_throw)) { 2362 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2363 DynamicExceptions, 2364 DynamicExceptionRanges); 2365 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2366 "Produced different number of exception types and ranges."); 2367 } 2368 2369 // If there's no noexcept specification, we're done. 2370 if (Tok.isNot(tok::kw_noexcept)) 2371 return Result; 2372 2373 // If we already had a dynamic specification, parse the noexcept for, 2374 // recovery, but emit a diagnostic and don't store the results. 2375 SourceRange NoexceptRange; 2376 ExceptionSpecificationType NoexceptType = EST_None; 2377 2378 SourceLocation KeywordLoc = ConsumeToken(); 2379 if (Tok.is(tok::l_paren)) { 2380 // There is an argument. 2381 BalancedDelimiterTracker T(*this, tok::l_paren); 2382 T.consumeOpen(); 2383 NoexceptType = EST_ComputedNoexcept; 2384 NoexceptExpr = ParseConstantExpression(); 2385 // The argument must be contextually convertible to bool. We use 2386 // ActOnBooleanCondition for this purpose. 2387 if (!NoexceptExpr.isInvalid()) 2388 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2389 NoexceptExpr.get()); 2390 T.consumeClose(); 2391 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); 2392 } else { 2393 // There is no argument. 2394 NoexceptType = EST_BasicNoexcept; 2395 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2396 } 2397 2398 if (Result == EST_None) { 2399 SpecificationRange = NoexceptRange; 2400 Result = NoexceptType; 2401 2402 // If there's a dynamic specification after a noexcept specification, 2403 // parse that and ignore the results. 2404 if (Tok.is(tok::kw_throw)) { 2405 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2406 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2407 DynamicExceptionRanges); 2408 } 2409 } else { 2410 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2411 } 2412 2413 return Result; 2414} 2415 2416/// ParseDynamicExceptionSpecification - Parse a C++ 2417/// dynamic-exception-specification (C++ [except.spec]). 2418/// 2419/// dynamic-exception-specification: 2420/// 'throw' '(' type-id-list [opt] ')' 2421/// [MS] 'throw' '(' '...' ')' 2422/// 2423/// type-id-list: 2424/// type-id ... [opt] 2425/// type-id-list ',' type-id ... [opt] 2426/// 2427ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2428 SourceRange &SpecificationRange, 2429 SmallVectorImpl<ParsedType> &Exceptions, 2430 SmallVectorImpl<SourceRange> &Ranges) { 2431 assert(Tok.is(tok::kw_throw) && "expected throw"); 2432 2433 SpecificationRange.setBegin(ConsumeToken()); 2434 BalancedDelimiterTracker T(*this, tok::l_paren); 2435 if (T.consumeOpen()) { 2436 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2437 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2438 return EST_DynamicNone; 2439 } 2440 2441 // Parse throw(...), a Microsoft extension that means "this function 2442 // can throw anything". 2443 if (Tok.is(tok::ellipsis)) { 2444 SourceLocation EllipsisLoc = ConsumeToken(); 2445 if (!getLang().MicrosoftExt) 2446 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2447 T.consumeClose(); 2448 SpecificationRange.setEnd(T.getCloseLocation()); 2449 return EST_MSAny; 2450 } 2451 2452 // Parse the sequence of type-ids. 2453 SourceRange Range; 2454 while (Tok.isNot(tok::r_paren)) { 2455 TypeResult Res(ParseTypeName(&Range)); 2456 2457 if (Tok.is(tok::ellipsis)) { 2458 // C++0x [temp.variadic]p5: 2459 // - In a dynamic-exception-specification (15.4); the pattern is a 2460 // type-id. 2461 SourceLocation Ellipsis = ConsumeToken(); 2462 Range.setEnd(Ellipsis); 2463 if (!Res.isInvalid()) 2464 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2465 } 2466 2467 if (!Res.isInvalid()) { 2468 Exceptions.push_back(Res.get()); 2469 Ranges.push_back(Range); 2470 } 2471 2472 if (Tok.is(tok::comma)) 2473 ConsumeToken(); 2474 else 2475 break; 2476 } 2477 2478 T.consumeClose(); 2479 SpecificationRange.setEnd(T.getCloseLocation()); 2480 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2481} 2482 2483/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2484/// function declaration. 2485TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2486 assert(Tok.is(tok::arrow) && "expected arrow"); 2487 2488 ConsumeToken(); 2489 2490 // FIXME: Need to suppress declarations when parsing this typename. 2491 // Otherwise in this function definition: 2492 // 2493 // auto f() -> struct X {} 2494 // 2495 // struct X is parsed as class definition because of the trailing 2496 // brace. 2497 return ParseTypeName(&Range); 2498} 2499 2500/// \brief We have just started parsing the definition of a new class, 2501/// so push that class onto our stack of classes that is currently 2502/// being parsed. 2503Sema::ParsingClassState 2504Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2505 assert((NonNestedClass || !ClassStack.empty()) && 2506 "Nested class without outer class"); 2507 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2508 return Actions.PushParsingClass(); 2509} 2510 2511/// \brief Deallocate the given parsed class and all of its nested 2512/// classes. 2513void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2514 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2515 delete Class->LateParsedDeclarations[I]; 2516 delete Class; 2517} 2518 2519/// \brief Pop the top class of the stack of classes that are 2520/// currently being parsed. 2521/// 2522/// This routine should be called when we have finished parsing the 2523/// definition of a class, but have not yet popped the Scope 2524/// associated with the class's definition. 2525/// 2526/// \returns true if the class we've popped is a top-level class, 2527/// false otherwise. 2528void Parser::PopParsingClass(Sema::ParsingClassState state) { 2529 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2530 2531 Actions.PopParsingClass(state); 2532 2533 ParsingClass *Victim = ClassStack.top(); 2534 ClassStack.pop(); 2535 if (Victim->TopLevelClass) { 2536 // Deallocate all of the nested classes of this class, 2537 // recursively: we don't need to keep any of this information. 2538 DeallocateParsedClasses(Victim); 2539 return; 2540 } 2541 assert(!ClassStack.empty() && "Missing top-level class?"); 2542 2543 if (Victim->LateParsedDeclarations.empty()) { 2544 // The victim is a nested class, but we will not need to perform 2545 // any processing after the definition of this class since it has 2546 // no members whose handling was delayed. Therefore, we can just 2547 // remove this nested class. 2548 DeallocateParsedClasses(Victim); 2549 return; 2550 } 2551 2552 // This nested class has some members that will need to be processed 2553 // after the top-level class is completely defined. Therefore, add 2554 // it to the list of nested classes within its parent. 2555 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2556 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2557 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2558} 2559 2560/// ParseCXX0XAttributeSpecifier - Parse a C++0x attribute-specifier. Currently 2561/// only parses standard attributes. 2562/// 2563/// [C++0x] attribute-specifier: 2564/// '[' '[' attribute-list ']' ']' 2565/// alignment-specifier 2566/// 2567/// [C++0x] attribute-list: 2568/// attribute[opt] 2569/// attribute-list ',' attribute[opt] 2570/// 2571/// [C++0x] attribute: 2572/// attribute-token attribute-argument-clause[opt] 2573/// 2574/// [C++0x] attribute-token: 2575/// identifier 2576/// attribute-scoped-token 2577/// 2578/// [C++0x] attribute-scoped-token: 2579/// attribute-namespace '::' identifier 2580/// 2581/// [C++0x] attribute-namespace: 2582/// identifier 2583/// 2584/// [C++0x] attribute-argument-clause: 2585/// '(' balanced-token-seq ')' 2586/// 2587/// [C++0x] balanced-token-seq: 2588/// balanced-token 2589/// balanced-token-seq balanced-token 2590/// 2591/// [C++0x] balanced-token: 2592/// '(' balanced-token-seq ')' 2593/// '[' balanced-token-seq ']' 2594/// '{' balanced-token-seq '}' 2595/// any token but '(', ')', '[', ']', '{', or '}' 2596void Parser::ParseCXX0XAttributeSpecifier(ParsedAttributes &attrs, 2597 SourceLocation *endLoc) { 2598 if (Tok.is(tok::kw_alignas)) { 2599 ParseAlignmentSpecifier(attrs, endLoc); 2600 return; 2601 } 2602 2603 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2604 && "Not a C++0x attribute list"); 2605 2606 ConsumeBracket(); 2607 ConsumeBracket(); 2608 2609 if (Tok.is(tok::comma)) { 2610 Diag(Tok.getLocation(), diag::err_expected_ident); 2611 ConsumeToken(); 2612 } 2613 2614 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2615 // attribute not present 2616 if (Tok.is(tok::comma)) { 2617 ConsumeToken(); 2618 continue; 2619 } 2620 2621 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2622 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2623 2624 // scoped attribute 2625 if (Tok.is(tok::coloncolon)) { 2626 ConsumeToken(); 2627 2628 if (!Tok.is(tok::identifier)) { 2629 Diag(Tok.getLocation(), diag::err_expected_ident); 2630 SkipUntil(tok::r_square, tok::comma, true, true); 2631 continue; 2632 } 2633 2634 ScopeName = AttrName; 2635 ScopeLoc = AttrLoc; 2636 2637 AttrName = Tok.getIdentifierInfo(); 2638 AttrLoc = ConsumeToken(); 2639 } 2640 2641 bool AttrParsed = false; 2642 // No scoped names are supported; ideally we could put all non-standard 2643 // attributes into namespaces. 2644 if (!ScopeName) { 2645 switch(AttributeList::getKind(AttrName)) 2646 { 2647 // No arguments 2648 case AttributeList::AT_carries_dependency: 2649 case AttributeList::AT_noreturn: { 2650 if (Tok.is(tok::l_paren)) { 2651 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2652 << AttrName->getName(); 2653 break; 2654 } 2655 2656 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2657 SourceLocation(), 0, 0, false, true); 2658 AttrParsed = true; 2659 break; 2660 } 2661 2662 // Silence warnings 2663 default: break; 2664 } 2665 } 2666 2667 // Skip the entire parameter clause, if any 2668 if (!AttrParsed && Tok.is(tok::l_paren)) { 2669 ConsumeParen(); 2670 // SkipUntil maintains the balancedness of tokens. 2671 SkipUntil(tok::r_paren, false); 2672 } 2673 } 2674 2675 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2676 SkipUntil(tok::r_square, false); 2677 if (endLoc) 2678 *endLoc = Tok.getLocation(); 2679 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2680 SkipUntil(tok::r_square, false); 2681} 2682 2683/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier-seq. 2684/// 2685/// attribute-specifier-seq: 2686/// attribute-specifier-seq[opt] attribute-specifier 2687void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2688 SourceLocation *endLoc) { 2689 SourceLocation StartLoc = Tok.getLocation(), Loc; 2690 if (!endLoc) 2691 endLoc = &Loc; 2692 2693 do { 2694 ParseCXX0XAttributeSpecifier(attrs, endLoc); 2695 } while (isCXX0XAttributeSpecifier()); 2696 2697 attrs.Range = SourceRange(StartLoc, *endLoc); 2698} 2699 2700/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2701/// 2702/// [MS] ms-attribute: 2703/// '[' token-seq ']' 2704/// 2705/// [MS] ms-attribute-seq: 2706/// ms-attribute[opt] 2707/// ms-attribute ms-attribute-seq 2708void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2709 SourceLocation *endLoc) { 2710 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2711 2712 while (Tok.is(tok::l_square)) { 2713 ConsumeBracket(); 2714 SkipUntil(tok::r_square, true, true); 2715 if (endLoc) *endLoc = Tok.getLocation(); 2716 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2717 } 2718} 2719 2720void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2721 AccessSpecifier& CurAS) { 2722 bool Result; 2723 if (ParseMicrosoftIfExistsCondition(Result)) 2724 return; 2725 2726 if (Tok.isNot(tok::l_brace)) { 2727 Diag(Tok, diag::err_expected_lbrace); 2728 return; 2729 } 2730 ConsumeBrace(); 2731 2732 // Condition is false skip all inside the {}. 2733 if (!Result) { 2734 SkipUntil(tok::r_brace, false); 2735 return; 2736 } 2737 2738 // Condition is true, parse the declaration. 2739 while (Tok.isNot(tok::r_brace)) { 2740 2741 // __if_exists, __if_not_exists can nest. 2742 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2743 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2744 continue; 2745 } 2746 2747 // Check for extraneous top-level semicolon. 2748 if (Tok.is(tok::semi)) { 2749 Diag(Tok, diag::ext_extra_struct_semi) 2750 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2751 << FixItHint::CreateRemoval(Tok.getLocation()); 2752 ConsumeToken(); 2753 continue; 2754 } 2755 2756 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2757 if (AS != AS_none) { 2758 // Current token is a C++ access specifier. 2759 CurAS = AS; 2760 SourceLocation ASLoc = Tok.getLocation(); 2761 ConsumeToken(); 2762 if (Tok.is(tok::colon)) 2763 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2764 else 2765 Diag(Tok, diag::err_expected_colon); 2766 ConsumeToken(); 2767 continue; 2768 } 2769 2770 // Parse all the comma separated declarators. 2771 ParseCXXClassMemberDeclaration(CurAS); 2772 } 2773 2774 if (Tok.isNot(tok::r_brace)) { 2775 Diag(Tok, diag::err_expected_rbrace); 2776 return; 2777 } 2778 ConsumeBrace(); 2779} 2780