ParseDeclCXX.cpp revision 3896fc5d4daaf003e451e797e37de57dd8cf9cd5
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 (InlineLoc.isValid()) 152 Diag(InlineLoc, getLang().CPlusPlus0x ? 153 diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace); 154 155 // Enter a scope for the namespace. 156 ParseScope NamespaceScope(this, Scope::DeclScope); 157 158 Decl *NamespcDecl = 159 Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc, 160 IdentLoc, Ident, T.getOpenLocation(), 161 attrs.getList()); 162 163 PrettyDeclStackTraceEntry CrashInfo(Actions, NamespcDecl, NamespaceLoc, 164 "parsing namespace"); 165 166 // Parse the contents of the namespace. This includes parsing recovery on 167 // any improperly nested namespaces. 168 ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0, 169 InlineLoc, attrs, T); 170 171 // Leave the namespace scope. 172 NamespaceScope.Exit(); 173 174 DeclEnd = T.getCloseLocation(); 175 Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd); 176 177 return NamespcDecl; 178} 179 180/// ParseInnerNamespace - Parse the contents of a namespace. 181void Parser::ParseInnerNamespace(std::vector<SourceLocation>& IdentLoc, 182 std::vector<IdentifierInfo*>& Ident, 183 std::vector<SourceLocation>& NamespaceLoc, 184 unsigned int index, SourceLocation& InlineLoc, 185 ParsedAttributes& attrs, 186 BalancedDelimiterTracker &Tracker) { 187 if (index == Ident.size()) { 188 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 189 ParsedAttributesWithRange attrs(AttrFactory); 190 MaybeParseCXX0XAttributes(attrs); 191 MaybeParseMicrosoftAttributes(attrs); 192 ParseExternalDeclaration(attrs); 193 } 194 195 // The caller is what called check -- we are simply calling 196 // the close for it. 197 Tracker.consumeClose(); 198 199 return; 200 } 201 202 // Parse improperly nested namespaces. 203 ParseScope NamespaceScope(this, Scope::DeclScope); 204 Decl *NamespcDecl = 205 Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(), 206 NamespaceLoc[index], IdentLoc[index], 207 Ident[index], Tracker.getOpenLocation(), 208 attrs.getList()); 209 210 ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc, 211 attrs, Tracker); 212 213 NamespaceScope.Exit(); 214 215 Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation()); 216} 217 218/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 219/// alias definition. 220/// 221Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 222 SourceLocation AliasLoc, 223 IdentifierInfo *Alias, 224 SourceLocation &DeclEnd) { 225 assert(Tok.is(tok::equal) && "Not equal token"); 226 227 ConsumeToken(); // eat the '='. 228 229 if (Tok.is(tok::code_completion)) { 230 Actions.CodeCompleteNamespaceAliasDecl(getCurScope()); 231 cutOffParsing(); 232 return 0; 233 } 234 235 CXXScopeSpec SS; 236 // Parse (optional) nested-name-specifier. 237 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 238 239 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 240 Diag(Tok, diag::err_expected_namespace_name); 241 // Skip to end of the definition and eat the ';'. 242 SkipUntil(tok::semi); 243 return 0; 244 } 245 246 // Parse identifier. 247 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 248 SourceLocation IdentLoc = ConsumeToken(); 249 250 // Eat the ';'. 251 DeclEnd = Tok.getLocation(); 252 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 253 "", tok::semi); 254 255 return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc, Alias, 256 SS, IdentLoc, Ident); 257} 258 259/// ParseLinkage - We know that the current token is a string_literal 260/// and just before that, that extern was seen. 261/// 262/// linkage-specification: [C++ 7.5p2: dcl.link] 263/// 'extern' string-literal '{' declaration-seq[opt] '}' 264/// 'extern' string-literal declaration 265/// 266Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, unsigned Context) { 267 assert(Tok.is(tok::string_literal) && "Not a string literal!"); 268 llvm::SmallString<8> LangBuffer; 269 bool Invalid = false; 270 StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 271 if (Invalid) 272 return 0; 273 274 SourceLocation Loc = ConsumeStringToken(); 275 276 ParseScope LinkageScope(this, Scope::DeclScope); 277 Decl *LinkageSpec 278 = Actions.ActOnStartLinkageSpecification(getCurScope(), 279 DS.getSourceRange().getBegin(), 280 Loc, Lang, 281 Tok.is(tok::l_brace) ? Tok.getLocation() 282 : SourceLocation()); 283 284 ParsedAttributesWithRange attrs(AttrFactory); 285 MaybeParseCXX0XAttributes(attrs); 286 MaybeParseMicrosoftAttributes(attrs); 287 288 if (Tok.isNot(tok::l_brace)) { 289 // Reset the source range in DS, as the leading "extern" 290 // does not really belong to the inner declaration ... 291 DS.SetRangeStart(SourceLocation()); 292 DS.SetRangeEnd(SourceLocation()); 293 // ... but anyway remember that such an "extern" was seen. 294 DS.setExternInLinkageSpec(true); 295 ParseExternalDeclaration(attrs, &DS); 296 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 297 SourceLocation()); 298 } 299 300 DS.abort(); 301 302 ProhibitAttributes(attrs); 303 304 BalancedDelimiterTracker T(*this, tok::l_brace); 305 T.consumeOpen(); 306 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 307 ParsedAttributesWithRange attrs(AttrFactory); 308 MaybeParseCXX0XAttributes(attrs); 309 MaybeParseMicrosoftAttributes(attrs); 310 ParseExternalDeclaration(attrs); 311 } 312 313 T.consumeClose(); 314 return Actions.ActOnFinishLinkageSpecification(getCurScope(), LinkageSpec, 315 T.getCloseLocation()); 316} 317 318/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 319/// using-directive. Assumes that current token is 'using'. 320Decl *Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 321 const ParsedTemplateInfo &TemplateInfo, 322 SourceLocation &DeclEnd, 323 ParsedAttributesWithRange &attrs, 324 Decl **OwnedType) { 325 assert(Tok.is(tok::kw_using) && "Not using token"); 326 ObjCDeclContextSwitch ObjCDC(*this); 327 328 // Eat 'using'. 329 SourceLocation UsingLoc = ConsumeToken(); 330 331 if (Tok.is(tok::code_completion)) { 332 Actions.CodeCompleteUsing(getCurScope()); 333 cutOffParsing(); 334 return 0; 335 } 336 337 // 'using namespace' means this is a using-directive. 338 if (Tok.is(tok::kw_namespace)) { 339 // Template parameters are always an error here. 340 if (TemplateInfo.Kind) { 341 SourceRange R = TemplateInfo.getSourceRange(); 342 Diag(UsingLoc, diag::err_templated_using_directive) 343 << R << FixItHint::CreateRemoval(R); 344 } 345 346 return ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs); 347 } 348 349 // Otherwise, it must be a using-declaration or an alias-declaration. 350 351 // Using declarations can't have attributes. 352 ProhibitAttributes(attrs); 353 354 return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd, 355 AS_none, OwnedType); 356} 357 358/// ParseUsingDirective - Parse C++ using-directive, assumes 359/// that current token is 'namespace' and 'using' was already parsed. 360/// 361/// using-directive: [C++ 7.3.p4: namespace.udir] 362/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 363/// namespace-name ; 364/// [GNU] using-directive: 365/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 366/// namespace-name attributes[opt] ; 367/// 368Decl *Parser::ParseUsingDirective(unsigned Context, 369 SourceLocation UsingLoc, 370 SourceLocation &DeclEnd, 371 ParsedAttributes &attrs) { 372 assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 373 374 // Eat 'namespace'. 375 SourceLocation NamespcLoc = ConsumeToken(); 376 377 if (Tok.is(tok::code_completion)) { 378 Actions.CodeCompleteUsingDirective(getCurScope()); 379 cutOffParsing(); 380 return 0; 381 } 382 383 CXXScopeSpec SS; 384 // Parse (optional) nested-name-specifier. 385 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 386 387 IdentifierInfo *NamespcName = 0; 388 SourceLocation IdentLoc = SourceLocation(); 389 390 // Parse namespace-name. 391 if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 392 Diag(Tok, diag::err_expected_namespace_name); 393 // If there was invalid namespace name, skip to end of decl, and eat ';'. 394 SkipUntil(tok::semi); 395 // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 396 return 0; 397 } 398 399 // Parse identifier. 400 NamespcName = Tok.getIdentifierInfo(); 401 IdentLoc = ConsumeToken(); 402 403 // Parse (optional) attributes (most likely GNU strong-using extension). 404 bool GNUAttr = false; 405 if (Tok.is(tok::kw___attribute)) { 406 GNUAttr = true; 407 ParseGNUAttributes(attrs); 408 } 409 410 // Eat ';'. 411 DeclEnd = Tok.getLocation(); 412 ExpectAndConsume(tok::semi, 413 GNUAttr ? diag::err_expected_semi_after_attribute_list 414 : diag::err_expected_semi_after_namespace_name, 415 "", tok::semi); 416 417 return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS, 418 IdentLoc, NamespcName, attrs.getList()); 419} 420 421/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration. 422/// Assumes that 'using' was already seen. 423/// 424/// using-declaration: [C++ 7.3.p3: namespace.udecl] 425/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 426/// unqualified-id 427/// 'using' :: unqualified-id 428/// 429/// alias-declaration: C++0x [decl.typedef]p2 430/// 'using' identifier = type-id ; 431/// 432Decl *Parser::ParseUsingDeclaration(unsigned Context, 433 const ParsedTemplateInfo &TemplateInfo, 434 SourceLocation UsingLoc, 435 SourceLocation &DeclEnd, 436 AccessSpecifier AS, 437 Decl **OwnedType) { 438 CXXScopeSpec SS; 439 SourceLocation TypenameLoc; 440 bool IsTypeName; 441 442 // Ignore optional 'typename'. 443 // FIXME: This is wrong; we should parse this as a typename-specifier. 444 if (Tok.is(tok::kw_typename)) { 445 TypenameLoc = Tok.getLocation(); 446 ConsumeToken(); 447 IsTypeName = true; 448 } 449 else 450 IsTypeName = false; 451 452 // Parse nested-name-specifier. 453 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 454 455 // Check nested-name specifier. 456 if (SS.isInvalid()) { 457 SkipUntil(tok::semi); 458 return 0; 459 } 460 461 // Parse the unqualified-id. We allow parsing of both constructor and 462 // destructor names and allow the action module to diagnose any semantic 463 // errors. 464 UnqualifiedId Name; 465 if (ParseUnqualifiedId(SS, 466 /*EnteringContext=*/false, 467 /*AllowDestructorName=*/true, 468 /*AllowConstructorName=*/true, 469 ParsedType(), 470 Name)) { 471 SkipUntil(tok::semi); 472 return 0; 473 } 474 475 ParsedAttributes attrs(AttrFactory); 476 477 // Maybe this is an alias-declaration. 478 bool IsAliasDecl = Tok.is(tok::equal); 479 TypeResult TypeAlias; 480 if (IsAliasDecl) { 481 // TODO: Attribute support. C++0x attributes may appear before the equals. 482 // Where can GNU attributes appear? 483 ConsumeToken(); 484 485 Diag(Tok.getLocation(), getLang().CPlusPlus0x ? 486 diag::warn_cxx98_compat_alias_declaration : 487 diag::ext_alias_declaration); 488 489 // Type alias templates cannot be specialized. 490 int SpecKind = -1; 491 if (TemplateInfo.Kind == ParsedTemplateInfo::Template && 492 Name.getKind() == UnqualifiedId::IK_TemplateId) 493 SpecKind = 0; 494 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) 495 SpecKind = 1; 496 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 497 SpecKind = 2; 498 if (SpecKind != -1) { 499 SourceRange Range; 500 if (SpecKind == 0) 501 Range = SourceRange(Name.TemplateId->LAngleLoc, 502 Name.TemplateId->RAngleLoc); 503 else 504 Range = TemplateInfo.getSourceRange(); 505 Diag(Range.getBegin(), diag::err_alias_declaration_specialization) 506 << SpecKind << Range; 507 SkipUntil(tok::semi); 508 return 0; 509 } 510 511 // Name must be an identifier. 512 if (Name.getKind() != UnqualifiedId::IK_Identifier) { 513 Diag(Name.StartLocation, diag::err_alias_declaration_not_identifier); 514 // No removal fixit: can't recover from this. 515 SkipUntil(tok::semi); 516 return 0; 517 } else if (IsTypeName) 518 Diag(TypenameLoc, diag::err_alias_declaration_not_identifier) 519 << FixItHint::CreateRemoval(SourceRange(TypenameLoc, 520 SS.isNotEmpty() ? SS.getEndLoc() : TypenameLoc)); 521 else if (SS.isNotEmpty()) 522 Diag(SS.getBeginLoc(), diag::err_alias_declaration_not_identifier) 523 << FixItHint::CreateRemoval(SS.getRange()); 524 525 TypeAlias = ParseTypeName(0, TemplateInfo.Kind ? 526 Declarator::AliasTemplateContext : 527 Declarator::AliasDeclContext, AS, OwnedType); 528 } else 529 // Parse (optional) attributes (most likely GNU strong-using extension). 530 MaybeParseGNUAttributes(attrs); 531 532 // Eat ';'. 533 DeclEnd = Tok.getLocation(); 534 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 535 !attrs.empty() ? "attributes list" : 536 IsAliasDecl ? "alias declaration" : "using declaration", 537 tok::semi); 538 539 // Diagnose an attempt to declare a templated using-declaration. 540 // In C++0x, alias-declarations can be templates: 541 // template <...> using id = type; 542 if (TemplateInfo.Kind && !IsAliasDecl) { 543 SourceRange R = TemplateInfo.getSourceRange(); 544 Diag(UsingLoc, diag::err_templated_using_declaration) 545 << R << FixItHint::CreateRemoval(R); 546 547 // Unfortunately, we have to bail out instead of recovering by 548 // ignoring the parameters, just in case the nested name specifier 549 // depends on the parameters. 550 return 0; 551 } 552 553 // "typename" keyword is allowed for identifiers only, 554 // because it may be a type definition. 555 if (IsTypeName && Name.getKind() != UnqualifiedId::IK_Identifier) { 556 Diag(Name.getSourceRange().getBegin(), diag::err_typename_identifiers_only) 557 << FixItHint::CreateRemoval(SourceRange(TypenameLoc)); 558 // Proceed parsing, but reset the IsTypeName flag. 559 IsTypeName = false; 560 } 561 562 if (IsAliasDecl) { 563 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 564 MultiTemplateParamsArg TemplateParamsArg(Actions, 565 TemplateParams ? TemplateParams->data() : 0, 566 TemplateParams ? TemplateParams->size() : 0); 567 return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg, 568 UsingLoc, Name, TypeAlias); 569 } 570 571 return Actions.ActOnUsingDeclaration(getCurScope(), AS, true, UsingLoc, SS, 572 Name, attrs.getList(), 573 IsTypeName, TypenameLoc); 574} 575 576/// ParseStaticAssertDeclaration - Parse C++0x or C1X static_assert-declaration. 577/// 578/// [C++0x] static_assert-declaration: 579/// static_assert ( constant-expression , string-literal ) ; 580/// 581/// [C1X] static_assert-declaration: 582/// _Static_assert ( constant-expression , string-literal ) ; 583/// 584Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 585 assert((Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) && 586 "Not a static_assert declaration"); 587 588 if (Tok.is(tok::kw__Static_assert) && !getLang().C1X) 589 Diag(Tok, diag::ext_c1x_static_assert); 590 if (Tok.is(tok::kw_static_assert)) 591 Diag(Tok, diag::warn_cxx98_compat_static_assert); 592 593 SourceLocation StaticAssertLoc = ConsumeToken(); 594 595 BalancedDelimiterTracker T(*this, tok::l_paren); 596 if (T.consumeOpen()) { 597 Diag(Tok, diag::err_expected_lparen); 598 return 0; 599 } 600 601 ExprResult AssertExpr(ParseConstantExpression()); 602 if (AssertExpr.isInvalid()) { 603 SkipUntil(tok::semi); 604 return 0; 605 } 606 607 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 608 return 0; 609 610 if (Tok.isNot(tok::string_literal)) { 611 Diag(Tok, diag::err_expected_string_literal); 612 SkipUntil(tok::semi); 613 return 0; 614 } 615 616 ExprResult AssertMessage(ParseStringLiteralExpression()); 617 if (AssertMessage.isInvalid()) 618 return 0; 619 620 T.consumeClose(); 621 622 DeclEnd = Tok.getLocation(); 623 ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert); 624 625 return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, 626 AssertExpr.take(), 627 AssertMessage.take(), 628 T.getCloseLocation()); 629} 630 631/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 632/// 633/// 'decltype' ( expression ) 634/// 635void Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 636 assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 637 638 SourceLocation StartLoc = ConsumeToken(); 639 BalancedDelimiterTracker T(*this, tok::l_paren); 640 if (T.expectAndConsume(diag::err_expected_lparen_after, 641 "decltype", tok::r_paren)) { 642 return; 643 } 644 645 // Parse the expression 646 647 // C++0x [dcl.type.simple]p4: 648 // The operand of the decltype specifier is an unevaluated operand. 649 EnterExpressionEvaluationContext Unevaluated(Actions, 650 Sema::Unevaluated); 651 ExprResult Result = ParseExpression(); 652 if (Result.isInvalid()) { 653 SkipUntil(tok::r_paren); 654 return; 655 } 656 657 // Match the ')' 658 T.consumeClose(); 659 if (T.getCloseLocation().isInvalid()) 660 return; 661 662 const char *PrevSpec = 0; 663 unsigned DiagID; 664 // Check for duplicate type specifiers (e.g. "int decltype(a)"). 665 if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 666 DiagID, Result.release())) 667 Diag(StartLoc, DiagID) << PrevSpec; 668} 669 670void Parser::ParseUnderlyingTypeSpecifier(DeclSpec &DS) { 671 assert(Tok.is(tok::kw___underlying_type) && 672 "Not an underlying type specifier"); 673 674 SourceLocation StartLoc = ConsumeToken(); 675 BalancedDelimiterTracker T(*this, tok::l_paren); 676 if (T.expectAndConsume(diag::err_expected_lparen_after, 677 "__underlying_type", tok::r_paren)) { 678 return; 679 } 680 681 TypeResult Result = ParseTypeName(); 682 if (Result.isInvalid()) { 683 SkipUntil(tok::r_paren); 684 return; 685 } 686 687 // Match the ')' 688 T.consumeClose(); 689 if (T.getCloseLocation().isInvalid()) 690 return; 691 692 const char *PrevSpec = 0; 693 unsigned DiagID; 694 if (DS.SetTypeSpecType(DeclSpec::TST_underlyingType, StartLoc, PrevSpec, 695 DiagID, Result.release())) 696 Diag(StartLoc, DiagID) << PrevSpec; 697} 698 699/// ParseClassName - Parse a C++ class-name, which names a class. Note 700/// that we only check that the result names a type; semantic analysis 701/// will need to verify that the type names a class. The result is 702/// either a type or NULL, depending on whether a type name was 703/// found. 704/// 705/// class-name: [C++ 9.1] 706/// identifier 707/// simple-template-id 708/// 709Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 710 CXXScopeSpec &SS) { 711 // Check whether we have a template-id that names a type. 712 if (Tok.is(tok::annot_template_id)) { 713 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 714 if (TemplateId->Kind == TNK_Type_template || 715 TemplateId->Kind == TNK_Dependent_template_name) { 716 AnnotateTemplateIdTokenAsType(); 717 718 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 719 ParsedType Type = getTypeAnnotation(Tok); 720 EndLocation = Tok.getAnnotationEndLoc(); 721 ConsumeToken(); 722 723 if (Type) 724 return Type; 725 return true; 726 } 727 728 // Fall through to produce an error below. 729 } 730 731 if (Tok.isNot(tok::identifier)) { 732 Diag(Tok, diag::err_expected_class_name); 733 return true; 734 } 735 736 IdentifierInfo *Id = Tok.getIdentifierInfo(); 737 SourceLocation IdLoc = ConsumeToken(); 738 739 if (Tok.is(tok::less)) { 740 // It looks the user intended to write a template-id here, but the 741 // template-name was wrong. Try to fix that. 742 TemplateNameKind TNK = TNK_Type_template; 743 TemplateTy Template; 744 if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, getCurScope(), 745 &SS, Template, TNK)) { 746 Diag(IdLoc, diag::err_unknown_template_name) 747 << Id; 748 } 749 750 if (!Template) 751 return true; 752 753 // Form the template name 754 UnqualifiedId TemplateName; 755 TemplateName.setIdentifier(Id, IdLoc); 756 757 // Parse the full template-id, then turn it into a type. 758 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 759 SourceLocation(), true)) 760 return true; 761 if (TNK == TNK_Dependent_template_name) 762 AnnotateTemplateIdTokenAsType(); 763 764 // If we didn't end up with a typename token, there's nothing more we 765 // can do. 766 if (Tok.isNot(tok::annot_typename)) 767 return true; 768 769 // Retrieve the type from the annotation token, consume that token, and 770 // return. 771 EndLocation = Tok.getAnnotationEndLoc(); 772 ParsedType Type = getTypeAnnotation(Tok); 773 ConsumeToken(); 774 return Type; 775 } 776 777 // We have an identifier; check whether it is actually a type. 778 ParsedType Type = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, true, 779 false, ParsedType(), 780 /*NonTrivialTypeSourceInfo=*/true); 781 if (!Type) { 782 Diag(IdLoc, diag::err_expected_class_name); 783 return true; 784 } 785 786 // Consume the identifier. 787 EndLocation = IdLoc; 788 789 // Fake up a Declarator to use with ActOnTypeName. 790 DeclSpec DS(AttrFactory); 791 DS.SetRangeStart(IdLoc); 792 DS.SetRangeEnd(EndLocation); 793 DS.getTypeSpecScope() = SS; 794 795 const char *PrevSpec = 0; 796 unsigned DiagID; 797 DS.SetTypeSpecType(TST_typename, IdLoc, PrevSpec, DiagID, Type); 798 799 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 800 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 801} 802 803/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 804/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 805/// until we reach the start of a definition or see a token that 806/// cannot start a definition. If SuppressDeclarations is true, we do know. 807/// 808/// class-specifier: [C++ class] 809/// class-head '{' member-specification[opt] '}' 810/// class-head '{' member-specification[opt] '}' attributes[opt] 811/// class-head: 812/// class-key identifier[opt] base-clause[opt] 813/// class-key nested-name-specifier identifier base-clause[opt] 814/// class-key nested-name-specifier[opt] simple-template-id 815/// base-clause[opt] 816/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 817/// [GNU] class-key attributes[opt] nested-name-specifier 818/// identifier base-clause[opt] 819/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 820/// simple-template-id base-clause[opt] 821/// class-key: 822/// 'class' 823/// 'struct' 824/// 'union' 825/// 826/// elaborated-type-specifier: [C++ dcl.type.elab] 827/// class-key ::[opt] nested-name-specifier[opt] identifier 828/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 829/// simple-template-id 830/// 831/// Note that the C++ class-specifier and elaborated-type-specifier, 832/// together, subsume the C99 struct-or-union-specifier: 833/// 834/// struct-or-union-specifier: [C99 6.7.2.1] 835/// struct-or-union identifier[opt] '{' struct-contents '}' 836/// struct-or-union identifier 837/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 838/// '}' attributes[opt] 839/// [GNU] struct-or-union attributes[opt] identifier 840/// struct-or-union: 841/// 'struct' 842/// 'union' 843void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 844 SourceLocation StartLoc, DeclSpec &DS, 845 const ParsedTemplateInfo &TemplateInfo, 846 AccessSpecifier AS, bool SuppressDeclarations){ 847 DeclSpec::TST TagType; 848 if (TagTokKind == tok::kw_struct) 849 TagType = DeclSpec::TST_struct; 850 else if (TagTokKind == tok::kw_class) 851 TagType = DeclSpec::TST_class; 852 else { 853 assert(TagTokKind == tok::kw_union && "Not a class specifier"); 854 TagType = DeclSpec::TST_union; 855 } 856 857 if (Tok.is(tok::code_completion)) { 858 // Code completion for a struct, class, or union name. 859 Actions.CodeCompleteTag(getCurScope(), TagType); 860 return cutOffParsing(); 861 } 862 863 // C++03 [temp.explicit] 14.7.2/8: 864 // The usual access checking rules do not apply to names used to specify 865 // explicit instantiations. 866 // 867 // As an extension we do not perform access checking on the names used to 868 // specify explicit specializations either. This is important to allow 869 // specializing traits classes for private types. 870 bool SuppressingAccessChecks = false; 871 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 872 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization) { 873 Actions.ActOnStartSuppressingAccessChecks(); 874 SuppressingAccessChecks = true; 875 } 876 877 ParsedAttributes attrs(AttrFactory); 878 // If attributes exist after tag, parse them. 879 if (Tok.is(tok::kw___attribute)) 880 ParseGNUAttributes(attrs); 881 882 // If declspecs exist after tag, parse them. 883 while (Tok.is(tok::kw___declspec)) 884 ParseMicrosoftDeclSpec(attrs); 885 886 // If C++0x attributes exist here, parse them. 887 // FIXME: Are we consistent with the ordering of parsing of different 888 // styles of attributes? 889 MaybeParseCXX0XAttributes(attrs); 890 891 if (TagType == DeclSpec::TST_struct && 892 !Tok.is(tok::identifier) && 893 Tok.getIdentifierInfo() && 894 (Tok.is(tok::kw___is_arithmetic) || 895 Tok.is(tok::kw___is_convertible) || 896 Tok.is(tok::kw___is_empty) || 897 Tok.is(tok::kw___is_floating_point) || 898 Tok.is(tok::kw___is_function) || 899 Tok.is(tok::kw___is_fundamental) || 900 Tok.is(tok::kw___is_integral) || 901 Tok.is(tok::kw___is_member_function_pointer) || 902 Tok.is(tok::kw___is_member_pointer) || 903 Tok.is(tok::kw___is_pod) || 904 Tok.is(tok::kw___is_pointer) || 905 Tok.is(tok::kw___is_same) || 906 Tok.is(tok::kw___is_scalar) || 907 Tok.is(tok::kw___is_signed) || 908 Tok.is(tok::kw___is_unsigned) || 909 Tok.is(tok::kw___is_void))) { 910 // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the 911 // name of struct templates, but some are keywords in GCC >= 4.3 912 // and Clang. Therefore, when we see the token sequence "struct 913 // X", make X into a normal identifier rather than a keyword, to 914 // allow libstdc++ 4.2 and libc++ to work properly. 915 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier(); 916 Tok.setKind(tok::identifier); 917 } 918 919 // Parse the (optional) nested-name-specifier. 920 CXXScopeSpec &SS = DS.getTypeSpecScope(); 921 if (getLang().CPlusPlus) { 922 // "FOO : BAR" is not a potential typo for "FOO::BAR". 923 ColonProtectionRAIIObject X(*this); 924 925 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), true)) 926 DS.SetTypeSpecError(); 927 if (SS.isSet()) 928 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 929 Diag(Tok, diag::err_expected_ident); 930 } 931 932 TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 933 934 // Parse the (optional) class name or simple-template-id. 935 IdentifierInfo *Name = 0; 936 SourceLocation NameLoc; 937 TemplateIdAnnotation *TemplateId = 0; 938 if (Tok.is(tok::identifier)) { 939 Name = Tok.getIdentifierInfo(); 940 NameLoc = ConsumeToken(); 941 942 if (Tok.is(tok::less) && getLang().CPlusPlus) { 943 // The name was supposed to refer to a template, but didn't. 944 // Eat the template argument list and try to continue parsing this as 945 // a class (or template thereof). 946 TemplateArgList TemplateArgs; 947 SourceLocation LAngleLoc, RAngleLoc; 948 if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, SS, 949 true, LAngleLoc, 950 TemplateArgs, RAngleLoc)) { 951 // We couldn't parse the template argument list at all, so don't 952 // try to give any location information for the list. 953 LAngleLoc = RAngleLoc = SourceLocation(); 954 } 955 956 Diag(NameLoc, diag::err_explicit_spec_non_template) 957 << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 958 << (TagType == DeclSpec::TST_class? 0 959 : TagType == DeclSpec::TST_struct? 1 960 : 2) 961 << Name 962 << SourceRange(LAngleLoc, RAngleLoc); 963 964 // Strip off the last template parameter list if it was empty, since 965 // we've removed its template argument list. 966 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 967 if (TemplateParams && TemplateParams->size() > 1) { 968 TemplateParams->pop_back(); 969 } else { 970 TemplateParams = 0; 971 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 972 = ParsedTemplateInfo::NonTemplate; 973 } 974 } else if (TemplateInfo.Kind 975 == ParsedTemplateInfo::ExplicitInstantiation) { 976 // Pretend this is just a forward declaration. 977 TemplateParams = 0; 978 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 979 = ParsedTemplateInfo::NonTemplate; 980 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 981 = SourceLocation(); 982 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 983 = SourceLocation(); 984 } 985 } 986 } else if (Tok.is(tok::annot_template_id)) { 987 TemplateId = takeTemplateIdAnnotation(Tok); 988 NameLoc = ConsumeToken(); 989 990 if (TemplateId->Kind != TNK_Type_template && 991 TemplateId->Kind != TNK_Dependent_template_name) { 992 // The template-name in the simple-template-id refers to 993 // something other than a class template. Give an appropriate 994 // error message and skip to the ';'. 995 SourceRange Range(NameLoc); 996 if (SS.isNotEmpty()) 997 Range.setBegin(SS.getBeginLoc()); 998 999 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 1000 << Name << static_cast<int>(TemplateId->Kind) << Range; 1001 1002 DS.SetTypeSpecError(); 1003 SkipUntil(tok::semi, false, true); 1004 if (SuppressingAccessChecks) 1005 Actions.ActOnStopSuppressingAccessChecks(); 1006 1007 return; 1008 } 1009 } 1010 1011 // As soon as we're finished parsing the class's template-id, turn access 1012 // checking back on. 1013 if (SuppressingAccessChecks) 1014 Actions.ActOnStopSuppressingAccessChecks(); 1015 1016 // There are four options here. If we have 'struct foo;', then this 1017 // is either a forward declaration or a friend declaration, which 1018 // have to be treated differently. If we have 'struct foo {...', 1019 // 'struct foo :...' or 'struct foo final[opt]' then this is a 1020 // definition. Otherwise we have something like 'struct foo xyz', a reference. 1021 // However, in some contexts, things look like declarations but are just 1022 // references, e.g. 1023 // new struct s; 1024 // or 1025 // &T::operator struct s; 1026 // For these, SuppressDeclarations is true. 1027 Sema::TagUseKind TUK; 1028 if (SuppressDeclarations) 1029 TUK = Sema::TUK_Reference; 1030 else if (Tok.is(tok::l_brace) || 1031 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1032 isCXX0XFinalKeyword()) { 1033 if (DS.isFriendSpecified()) { 1034 // C++ [class.friend]p2: 1035 // A class shall not be defined in a friend declaration. 1036 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 1037 << SourceRange(DS.getFriendSpecLoc()); 1038 1039 // Skip everything up to the semicolon, so that this looks like a proper 1040 // friend class (or template thereof) declaration. 1041 SkipUntil(tok::semi, true, true); 1042 TUK = Sema::TUK_Friend; 1043 } else { 1044 // Okay, this is a class definition. 1045 TUK = Sema::TUK_Definition; 1046 } 1047 } else if (Tok.is(tok::semi)) 1048 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 1049 else 1050 TUK = Sema::TUK_Reference; 1051 1052 if (!Name && !TemplateId && (DS.getTypeSpecType() == DeclSpec::TST_error || 1053 TUK != Sema::TUK_Definition)) { 1054 if (DS.getTypeSpecType() != DeclSpec::TST_error) { 1055 // We have a declaration or reference to an anonymous class. 1056 Diag(StartLoc, diag::err_anon_type_definition) 1057 << DeclSpec::getSpecifierName(TagType); 1058 } 1059 1060 SkipUntil(tok::comma, true); 1061 return; 1062 } 1063 1064 // Create the tag portion of the class or class template. 1065 DeclResult TagOrTempResult = true; // invalid 1066 TypeResult TypeResult = true; // invalid 1067 1068 bool Owned = false; 1069 if (TemplateId) { 1070 // Explicit specialization, class template partial specialization, 1071 // or explicit instantiation. 1072 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 1073 TemplateId->getTemplateArgs(), 1074 TemplateId->NumArgs); 1075 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1076 TUK == Sema::TUK_Declaration) { 1077 // This is an explicit instantiation of a class template. 1078 TagOrTempResult 1079 = Actions.ActOnExplicitInstantiation(getCurScope(), 1080 TemplateInfo.ExternLoc, 1081 TemplateInfo.TemplateLoc, 1082 TagType, 1083 StartLoc, 1084 SS, 1085 TemplateId->Template, 1086 TemplateId->TemplateNameLoc, 1087 TemplateId->LAngleLoc, 1088 TemplateArgsPtr, 1089 TemplateId->RAngleLoc, 1090 attrs.getList()); 1091 1092 // Friend template-ids are treated as references unless 1093 // they have template headers, in which case they're ill-formed 1094 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 1095 // We diagnose this error in ActOnClassTemplateSpecialization. 1096 } else if (TUK == Sema::TUK_Reference || 1097 (TUK == Sema::TUK_Friend && 1098 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 1099 TypeResult = Actions.ActOnTagTemplateIdType(TUK, TagType, 1100 StartLoc, 1101 TemplateId->SS, 1102 TemplateId->Template, 1103 TemplateId->TemplateNameLoc, 1104 TemplateId->LAngleLoc, 1105 TemplateArgsPtr, 1106 TemplateId->RAngleLoc); 1107 } else { 1108 // This is an explicit specialization or a class template 1109 // partial specialization. 1110 TemplateParameterLists FakedParamLists; 1111 1112 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 1113 // This looks like an explicit instantiation, because we have 1114 // something like 1115 // 1116 // template class Foo<X> 1117 // 1118 // but it actually has a definition. Most likely, this was 1119 // meant to be an explicit specialization, but the user forgot 1120 // the '<>' after 'template'. 1121 assert(TUK == Sema::TUK_Definition && "Expected a definition here"); 1122 1123 SourceLocation LAngleLoc 1124 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1125 Diag(TemplateId->TemplateNameLoc, 1126 diag::err_explicit_instantiation_with_definition) 1127 << SourceRange(TemplateInfo.TemplateLoc) 1128 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1129 1130 // Create a fake template parameter list that contains only 1131 // "template<>", so that we treat this construct as a class 1132 // template specialization. 1133 FakedParamLists.push_back( 1134 Actions.ActOnTemplateParameterList(0, SourceLocation(), 1135 TemplateInfo.TemplateLoc, 1136 LAngleLoc, 1137 0, 0, 1138 LAngleLoc)); 1139 TemplateParams = &FakedParamLists; 1140 } 1141 1142 // Build the class template specialization. 1143 TagOrTempResult 1144 = Actions.ActOnClassTemplateSpecialization(getCurScope(), TagType, TUK, 1145 StartLoc, DS.getModulePrivateSpecLoc(), SS, 1146 TemplateId->Template, 1147 TemplateId->TemplateNameLoc, 1148 TemplateId->LAngleLoc, 1149 TemplateArgsPtr, 1150 TemplateId->RAngleLoc, 1151 attrs.getList(), 1152 MultiTemplateParamsArg(Actions, 1153 TemplateParams? &(*TemplateParams)[0] : 0, 1154 TemplateParams? TemplateParams->size() : 0)); 1155 } 1156 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1157 TUK == Sema::TUK_Declaration) { 1158 // Explicit instantiation of a member of a class template 1159 // specialization, e.g., 1160 // 1161 // template struct Outer<int>::Inner; 1162 // 1163 TagOrTempResult 1164 = Actions.ActOnExplicitInstantiation(getCurScope(), 1165 TemplateInfo.ExternLoc, 1166 TemplateInfo.TemplateLoc, 1167 TagType, StartLoc, SS, Name, 1168 NameLoc, attrs.getList()); 1169 } else if (TUK == Sema::TUK_Friend && 1170 TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) { 1171 TagOrTempResult = 1172 Actions.ActOnTemplatedFriendTag(getCurScope(), DS.getFriendSpecLoc(), 1173 TagType, StartLoc, SS, 1174 Name, NameLoc, attrs.getList(), 1175 MultiTemplateParamsArg(Actions, 1176 TemplateParams? &(*TemplateParams)[0] : 0, 1177 TemplateParams? TemplateParams->size() : 0)); 1178 } else { 1179 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 1180 TUK == Sema::TUK_Definition) { 1181 // FIXME: Diagnose this particular error. 1182 } 1183 1184 bool IsDependent = false; 1185 1186 // Don't pass down template parameter lists if this is just a tag 1187 // reference. For example, we don't need the template parameters here: 1188 // template <class T> class A *makeA(T t); 1189 MultiTemplateParamsArg TParams; 1190 if (TUK != Sema::TUK_Reference && TemplateParams) 1191 TParams = 1192 MultiTemplateParamsArg(&(*TemplateParams)[0], TemplateParams->size()); 1193 1194 // Declaration or definition of a class type 1195 TagOrTempResult = Actions.ActOnTag(getCurScope(), TagType, TUK, StartLoc, 1196 SS, Name, NameLoc, attrs.getList(), AS, 1197 DS.getModulePrivateSpecLoc(), 1198 TParams, Owned, IsDependent, false, 1199 false, clang::TypeResult()); 1200 1201 // If ActOnTag said the type was dependent, try again with the 1202 // less common call. 1203 if (IsDependent) { 1204 assert(TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend); 1205 TypeResult = Actions.ActOnDependentTag(getCurScope(), TagType, TUK, 1206 SS, Name, StartLoc, NameLoc); 1207 } 1208 } 1209 1210 // If there is a body, parse it and inform the actions module. 1211 if (TUK == Sema::TUK_Definition) { 1212 assert(Tok.is(tok::l_brace) || 1213 (getLang().CPlusPlus && Tok.is(tok::colon)) || 1214 isCXX0XFinalKeyword()); 1215 if (getLang().CPlusPlus) 1216 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 1217 else 1218 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 1219 } 1220 1221 const char *PrevSpec = 0; 1222 unsigned DiagID; 1223 bool Result; 1224 if (!TypeResult.isInvalid()) { 1225 Result = DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 1226 NameLoc.isValid() ? NameLoc : StartLoc, 1227 PrevSpec, DiagID, TypeResult.get()); 1228 } else if (!TagOrTempResult.isInvalid()) { 1229 Result = DS.SetTypeSpecType(TagType, StartLoc, 1230 NameLoc.isValid() ? NameLoc : StartLoc, 1231 PrevSpec, DiagID, TagOrTempResult.get(), Owned); 1232 } else { 1233 DS.SetTypeSpecError(); 1234 return; 1235 } 1236 1237 if (Result) 1238 Diag(StartLoc, DiagID) << PrevSpec; 1239 1240 // At this point, we've successfully parsed a class-specifier in 'definition' 1241 // form (e.g. "struct foo { int x; }". While we could just return here, we're 1242 // going to look at what comes after it to improve error recovery. If an 1243 // impossible token occurs next, we assume that the programmer forgot a ; at 1244 // the end of the declaration and recover that way. 1245 // 1246 // This switch enumerates the valid "follow" set for definition. 1247 if (TUK == Sema::TUK_Definition) { 1248 bool ExpectedSemi = true; 1249 switch (Tok.getKind()) { 1250 default: break; 1251 case tok::semi: // struct foo {...} ; 1252 case tok::star: // struct foo {...} * P; 1253 case tok::amp: // struct foo {...} & R = ... 1254 case tok::identifier: // struct foo {...} V ; 1255 case tok::r_paren: //(struct foo {...} ) {4} 1256 case tok::annot_cxxscope: // struct foo {...} a:: b; 1257 case tok::annot_typename: // struct foo {...} a ::b; 1258 case tok::annot_template_id: // struct foo {...} a<int> ::b; 1259 case tok::l_paren: // struct foo {...} ( x); 1260 case tok::comma: // __builtin_offsetof(struct foo{...} , 1261 ExpectedSemi = false; 1262 break; 1263 // Type qualifiers 1264 case tok::kw_const: // struct foo {...} const x; 1265 case tok::kw_volatile: // struct foo {...} volatile x; 1266 case tok::kw_restrict: // struct foo {...} restrict x; 1267 case tok::kw_inline: // struct foo {...} inline foo() {}; 1268 // Storage-class specifiers 1269 case tok::kw_static: // struct foo {...} static x; 1270 case tok::kw_extern: // struct foo {...} extern x; 1271 case tok::kw_typedef: // struct foo {...} typedef x; 1272 case tok::kw_register: // struct foo {...} register x; 1273 case tok::kw_auto: // struct foo {...} auto x; 1274 case tok::kw_mutable: // struct foo {...} mutable x; 1275 case tok::kw_constexpr: // struct foo {...} constexpr x; 1276 // As shown above, type qualifiers and storage class specifiers absolutely 1277 // can occur after class specifiers according to the grammar. However, 1278 // almost no one actually writes code like this. If we see one of these, 1279 // it is much more likely that someone missed a semi colon and the 1280 // type/storage class specifier we're seeing is part of the *next* 1281 // intended declaration, as in: 1282 // 1283 // struct foo { ... } 1284 // typedef int X; 1285 // 1286 // We'd really like to emit a missing semicolon error instead of emitting 1287 // an error on the 'int' saying that you can't have two type specifiers in 1288 // the same declaration of X. Because of this, we look ahead past this 1289 // token to see if it's a type specifier. If so, we know the code is 1290 // otherwise invalid, so we can produce the expected semi error. 1291 if (!isKnownToBeTypeSpecifier(NextToken())) 1292 ExpectedSemi = false; 1293 break; 1294 1295 case tok::r_brace: // struct bar { struct foo {...} } 1296 // Missing ';' at end of struct is accepted as an extension in C mode. 1297 if (!getLang().CPlusPlus) 1298 ExpectedSemi = false; 1299 break; 1300 } 1301 1302 // C++ [temp]p3 In a template-declaration which defines a class, no 1303 // declarator is permitted. 1304 if (TemplateInfo.Kind) 1305 ExpectedSemi = true; 1306 1307 if (ExpectedSemi) { 1308 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1309 TagType == DeclSpec::TST_class ? "class" 1310 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1311 // Push this token back into the preprocessor and change our current token 1312 // to ';' so that the rest of the code recovers as though there were an 1313 // ';' after the definition. 1314 PP.EnterToken(Tok); 1315 Tok.setKind(tok::semi); 1316 } 1317 } 1318} 1319 1320/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1321/// 1322/// base-clause : [C++ class.derived] 1323/// ':' base-specifier-list 1324/// base-specifier-list: 1325/// base-specifier '...'[opt] 1326/// base-specifier-list ',' base-specifier '...'[opt] 1327void Parser::ParseBaseClause(Decl *ClassDecl) { 1328 assert(Tok.is(tok::colon) && "Not a base clause"); 1329 ConsumeToken(); 1330 1331 // Build up an array of parsed base specifiers. 1332 SmallVector<CXXBaseSpecifier *, 8> BaseInfo; 1333 1334 while (true) { 1335 // Parse a base-specifier. 1336 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1337 if (Result.isInvalid()) { 1338 // Skip the rest of this base specifier, up until the comma or 1339 // opening brace. 1340 SkipUntil(tok::comma, tok::l_brace, true, true); 1341 } else { 1342 // Add this to our array of base specifiers. 1343 BaseInfo.push_back(Result.get()); 1344 } 1345 1346 // If the next token is a comma, consume it and keep reading 1347 // base-specifiers. 1348 if (Tok.isNot(tok::comma)) break; 1349 1350 // Consume the comma. 1351 ConsumeToken(); 1352 } 1353 1354 // Attach the base specifiers 1355 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1356} 1357 1358/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1359/// one entry in the base class list of a class specifier, for example: 1360/// class foo : public bar, virtual private baz { 1361/// 'public bar' and 'virtual private baz' are each base-specifiers. 1362/// 1363/// base-specifier: [C++ class.derived] 1364/// ::[opt] nested-name-specifier[opt] class-name 1365/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1366/// class-name 1367/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1368/// class-name 1369Parser::BaseResult Parser::ParseBaseSpecifier(Decl *ClassDecl) { 1370 bool IsVirtual = false; 1371 SourceLocation StartLoc = Tok.getLocation(); 1372 1373 // Parse the 'virtual' keyword. 1374 if (Tok.is(tok::kw_virtual)) { 1375 ConsumeToken(); 1376 IsVirtual = true; 1377 } 1378 1379 // Parse an (optional) access specifier. 1380 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1381 if (Access != AS_none) 1382 ConsumeToken(); 1383 1384 // Parse the 'virtual' keyword (again!), in case it came after the 1385 // access specifier. 1386 if (Tok.is(tok::kw_virtual)) { 1387 SourceLocation VirtualLoc = ConsumeToken(); 1388 if (IsVirtual) { 1389 // Complain about duplicate 'virtual' 1390 Diag(VirtualLoc, diag::err_dup_virtual) 1391 << FixItHint::CreateRemoval(VirtualLoc); 1392 } 1393 1394 IsVirtual = true; 1395 } 1396 1397 // Parse optional '::' and optional nested-name-specifier. 1398 CXXScopeSpec SS; 1399 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 1400 1401 // The location of the base class itself. 1402 SourceLocation BaseLoc = Tok.getLocation(); 1403 1404 // Parse the class-name. 1405 SourceLocation EndLocation; 1406 TypeResult BaseType = ParseClassName(EndLocation, SS); 1407 if (BaseType.isInvalid()) 1408 return true; 1409 1410 // Parse the optional ellipsis (for a pack expansion). The ellipsis is 1411 // actually part of the base-specifier-list grammar productions, but we 1412 // parse it here for convenience. 1413 SourceLocation EllipsisLoc; 1414 if (Tok.is(tok::ellipsis)) 1415 EllipsisLoc = ConsumeToken(); 1416 1417 // Find the complete source range for the base-specifier. 1418 SourceRange Range(StartLoc, EndLocation); 1419 1420 // Notify semantic analysis that we have parsed a complete 1421 // base-specifier. 1422 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1423 BaseType.get(), BaseLoc, EllipsisLoc); 1424} 1425 1426/// getAccessSpecifierIfPresent - Determine whether the next token is 1427/// a C++ access-specifier. 1428/// 1429/// access-specifier: [C++ class.derived] 1430/// 'private' 1431/// 'protected' 1432/// 'public' 1433AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1434 switch (Tok.getKind()) { 1435 default: return AS_none; 1436 case tok::kw_private: return AS_private; 1437 case tok::kw_protected: return AS_protected; 1438 case tok::kw_public: return AS_public; 1439 } 1440} 1441 1442void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1443 Decl *ThisDecl) { 1444 // We just declared a member function. If this member function 1445 // has any default arguments, we'll need to parse them later. 1446 LateParsedMethodDeclaration *LateMethod = 0; 1447 DeclaratorChunk::FunctionTypeInfo &FTI 1448 = DeclaratorInfo.getFunctionTypeInfo(); 1449 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1450 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1451 if (!LateMethod) { 1452 // Push this method onto the stack of late-parsed method 1453 // declarations. 1454 LateMethod = new LateParsedMethodDeclaration(this, ThisDecl); 1455 getCurrentClass().LateParsedDeclarations.push_back(LateMethod); 1456 LateMethod->TemplateScope = getCurScope()->isTemplateParamScope(); 1457 1458 // Add all of the parameters prior to this one (they don't 1459 // have default arguments). 1460 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1461 for (unsigned I = 0; I < ParamIdx; ++I) 1462 LateMethod->DefaultArgs.push_back( 1463 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1464 } 1465 1466 // Add this parameter to the list of parameters (it or may 1467 // not have a default argument). 1468 LateMethod->DefaultArgs.push_back( 1469 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1470 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1471 } 1472 } 1473} 1474 1475/// isCXX0XVirtSpecifier - Determine whether the next token is a C++0x 1476/// virt-specifier. 1477/// 1478/// virt-specifier: 1479/// override 1480/// final 1481VirtSpecifiers::Specifier Parser::isCXX0XVirtSpecifier() const { 1482 if (!getLang().CPlusPlus) 1483 return VirtSpecifiers::VS_None; 1484 1485 if (Tok.is(tok::identifier)) { 1486 IdentifierInfo *II = Tok.getIdentifierInfo(); 1487 1488 // Initialize the contextual keywords. 1489 if (!Ident_final) { 1490 Ident_final = &PP.getIdentifierTable().get("final"); 1491 Ident_override = &PP.getIdentifierTable().get("override"); 1492 } 1493 1494 if (II == Ident_override) 1495 return VirtSpecifiers::VS_Override; 1496 1497 if (II == Ident_final) 1498 return VirtSpecifiers::VS_Final; 1499 } 1500 1501 return VirtSpecifiers::VS_None; 1502} 1503 1504/// ParseOptionalCXX0XVirtSpecifierSeq - Parse a virt-specifier-seq. 1505/// 1506/// virt-specifier-seq: 1507/// virt-specifier 1508/// virt-specifier-seq virt-specifier 1509void Parser::ParseOptionalCXX0XVirtSpecifierSeq(VirtSpecifiers &VS) { 1510 while (true) { 1511 VirtSpecifiers::Specifier Specifier = isCXX0XVirtSpecifier(); 1512 if (Specifier == VirtSpecifiers::VS_None) 1513 return; 1514 1515 // C++ [class.mem]p8: 1516 // A virt-specifier-seq shall contain at most one of each virt-specifier. 1517 const char *PrevSpec = 0; 1518 if (VS.SetSpecifier(Specifier, Tok.getLocation(), PrevSpec)) 1519 Diag(Tok.getLocation(), diag::err_duplicate_virt_specifier) 1520 << PrevSpec 1521 << FixItHint::CreateRemoval(Tok.getLocation()); 1522 1523 Diag(Tok.getLocation(), getLang().CPlusPlus0x ? 1524 diag::warn_cxx98_compat_override_control_keyword : 1525 diag::ext_override_control_keyword) 1526 << VirtSpecifiers::getSpecifierName(Specifier); 1527 ConsumeToken(); 1528 } 1529} 1530 1531/// isCXX0XFinalKeyword - Determine whether the next token is a C++0x 1532/// contextual 'final' keyword. 1533bool Parser::isCXX0XFinalKeyword() const { 1534 if (!getLang().CPlusPlus) 1535 return false; 1536 1537 if (!Tok.is(tok::identifier)) 1538 return false; 1539 1540 // Initialize the contextual keywords. 1541 if (!Ident_final) { 1542 Ident_final = &PP.getIdentifierTable().get("final"); 1543 Ident_override = &PP.getIdentifierTable().get("override"); 1544 } 1545 1546 return Tok.getIdentifierInfo() == Ident_final; 1547} 1548 1549/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1550/// 1551/// member-declaration: 1552/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1553/// function-definition ';'[opt] 1554/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1555/// using-declaration [TODO] 1556/// [C++0x] static_assert-declaration 1557/// template-declaration 1558/// [GNU] '__extension__' member-declaration 1559/// 1560/// member-declarator-list: 1561/// member-declarator 1562/// member-declarator-list ',' member-declarator 1563/// 1564/// member-declarator: 1565/// declarator virt-specifier-seq[opt] pure-specifier[opt] 1566/// declarator constant-initializer[opt] 1567/// [C++11] declarator brace-or-equal-initializer[opt] 1568/// identifier[opt] ':' constant-expression 1569/// 1570/// virt-specifier-seq: 1571/// virt-specifier 1572/// virt-specifier-seq virt-specifier 1573/// 1574/// virt-specifier: 1575/// override 1576/// final 1577/// 1578/// pure-specifier: 1579/// '= 0' 1580/// 1581/// constant-initializer: 1582/// '=' constant-expression 1583/// 1584void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1585 AttributeList *AccessAttrs, 1586 const ParsedTemplateInfo &TemplateInfo, 1587 ParsingDeclRAIIObject *TemplateDiags) { 1588 if (Tok.is(tok::at)) { 1589 if (getLang().ObjC1 && NextToken().isObjCAtKeyword(tok::objc_defs)) 1590 Diag(Tok, diag::err_at_defs_cxx); 1591 else 1592 Diag(Tok, diag::err_at_in_class); 1593 1594 ConsumeToken(); 1595 SkipUntil(tok::r_brace); 1596 return; 1597 } 1598 1599 // Access declarations. 1600 if (!TemplateInfo.Kind && 1601 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1602 !TryAnnotateCXXScopeToken() && 1603 Tok.is(tok::annot_cxxscope)) { 1604 bool isAccessDecl = false; 1605 if (NextToken().is(tok::identifier)) 1606 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1607 else 1608 isAccessDecl = NextToken().is(tok::kw_operator); 1609 1610 if (isAccessDecl) { 1611 // Collect the scope specifier token we annotated earlier. 1612 CXXScopeSpec SS; 1613 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 1614 1615 // Try to parse an unqualified-id. 1616 UnqualifiedId Name; 1617 if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) { 1618 SkipUntil(tok::semi); 1619 return; 1620 } 1621 1622 // TODO: recover from mistakenly-qualified operator declarations. 1623 if (ExpectAndConsume(tok::semi, 1624 diag::err_expected_semi_after, 1625 "access declaration", 1626 tok::semi)) 1627 return; 1628 1629 Actions.ActOnUsingDeclaration(getCurScope(), AS, 1630 false, SourceLocation(), 1631 SS, Name, 1632 /* AttrList */ 0, 1633 /* IsTypeName */ false, 1634 SourceLocation()); 1635 return; 1636 } 1637 } 1638 1639 // static_assert-declaration 1640 if (Tok.is(tok::kw_static_assert) || Tok.is(tok::kw__Static_assert)) { 1641 // FIXME: Check for templates 1642 SourceLocation DeclEnd; 1643 ParseStaticAssertDeclaration(DeclEnd); 1644 return; 1645 } 1646 1647 if (Tok.is(tok::kw_template)) { 1648 assert(!TemplateInfo.TemplateParams && 1649 "Nested template improperly parsed?"); 1650 SourceLocation DeclEnd; 1651 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1652 AS, AccessAttrs); 1653 return; 1654 } 1655 1656 // Handle: member-declaration ::= '__extension__' member-declaration 1657 if (Tok.is(tok::kw___extension__)) { 1658 // __extension__ silences extension warnings in the subexpression. 1659 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1660 ConsumeToken(); 1661 return ParseCXXClassMemberDeclaration(AS, AccessAttrs, 1662 TemplateInfo, TemplateDiags); 1663 } 1664 1665 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1666 // is a bitfield. 1667 ColonProtectionRAIIObject X(*this); 1668 1669 ParsedAttributesWithRange attrs(AttrFactory); 1670 // Optional C++0x attribute-specifier 1671 MaybeParseCXX0XAttributes(attrs); 1672 MaybeParseMicrosoftAttributes(attrs); 1673 1674 if (Tok.is(tok::kw_using)) { 1675 ProhibitAttributes(attrs); 1676 1677 // Eat 'using'. 1678 SourceLocation UsingLoc = ConsumeToken(); 1679 1680 if (Tok.is(tok::kw_namespace)) { 1681 Diag(UsingLoc, diag::err_using_namespace_in_class); 1682 SkipUntil(tok::semi, true, true); 1683 } else { 1684 SourceLocation DeclEnd; 1685 // Otherwise, it must be a using-declaration or an alias-declaration. 1686 ParseUsingDeclaration(Declarator::MemberContext, TemplateInfo, 1687 UsingLoc, DeclEnd, AS); 1688 } 1689 return; 1690 } 1691 1692 // decl-specifier-seq: 1693 // Parse the common declaration-specifiers piece. 1694 ParsingDeclSpec DS(*this, TemplateDiags); 1695 DS.takeAttributesFrom(attrs); 1696 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1697 1698 MultiTemplateParamsArg TemplateParams(Actions, 1699 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1700 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1701 1702 if (Tok.is(tok::semi)) { 1703 ConsumeToken(); 1704 Decl *TheDecl = 1705 Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS, TemplateParams); 1706 DS.complete(TheDecl); 1707 return; 1708 } 1709 1710 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1711 VirtSpecifiers VS; 1712 1713 // Hold late-parsed attributes so we can attach a Decl to them later. 1714 LateParsedAttrList LateParsedAttrs; 1715 1716 SourceLocation EqualLoc; 1717 bool HasInitializer = false; 1718 ExprResult Init; 1719 if (Tok.isNot(tok::colon)) { 1720 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1721 ColonProtectionRAIIObject X(*this); 1722 1723 // Parse the first declarator. 1724 ParseDeclarator(DeclaratorInfo); 1725 // Error parsing the declarator? 1726 if (!DeclaratorInfo.hasName()) { 1727 // If so, skip until the semi-colon or a }. 1728 SkipUntil(tok::r_brace, true, true); 1729 if (Tok.is(tok::semi)) 1730 ConsumeToken(); 1731 return; 1732 } 1733 1734 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1735 1736 // If attributes exist after the declarator, but before an '{', parse them. 1737 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1738 1739 // MSVC permits pure specifier on inline functions declared at class scope. 1740 // Hence check for =0 before checking for function definition. 1741 if (getLang().MicrosoftExt && Tok.is(tok::equal) && 1742 DeclaratorInfo.isFunctionDeclarator() && 1743 NextToken().is(tok::numeric_constant)) { 1744 EqualLoc = ConsumeToken(); 1745 Init = ParseInitializer(); 1746 if (Init.isInvalid()) 1747 SkipUntil(tok::comma, true, true); 1748 else 1749 HasInitializer = true; 1750 } 1751 1752 bool IsDefinition = false; 1753 // function-definition: 1754 // 1755 // In C++11, a non-function declarator followed by an open brace is a 1756 // braced-init-list for an in-class member initialization, not an 1757 // erroneous function definition. 1758 if (Tok.is(tok::l_brace) && !getLang().CPlusPlus0x) { 1759 IsDefinition = true; 1760 } else if (DeclaratorInfo.isFunctionDeclarator()) { 1761 if (Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) { 1762 IsDefinition = true; 1763 } else if (Tok.is(tok::equal)) { 1764 const Token &KW = NextToken(); 1765 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete)) 1766 IsDefinition = true; 1767 } 1768 } 1769 1770 if (IsDefinition) { 1771 if (!DeclaratorInfo.isFunctionDeclarator()) { 1772 Diag(Tok, diag::err_func_def_no_params); 1773 ConsumeBrace(); 1774 SkipUntil(tok::r_brace, true); 1775 1776 // Consume the optional ';' 1777 if (Tok.is(tok::semi)) 1778 ConsumeToken(); 1779 return; 1780 } 1781 1782 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1783 Diag(Tok, diag::err_function_declared_typedef); 1784 // This recovery skips the entire function body. It would be nice 1785 // to simply call ParseCXXInlineMethodDef() below, however Sema 1786 // assumes the declarator represents a function, not a typedef. 1787 ConsumeBrace(); 1788 SkipUntil(tok::r_brace, true); 1789 1790 // Consume the optional ';' 1791 if (Tok.is(tok::semi)) 1792 ConsumeToken(); 1793 return; 1794 } 1795 1796 Decl *FunDecl = 1797 ParseCXXInlineMethodDef(AS, AccessAttrs, DeclaratorInfo, TemplateInfo, 1798 VS, Init); 1799 1800 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1801 LateParsedAttrs[i]->setDecl(FunDecl); 1802 } 1803 LateParsedAttrs.clear(); 1804 1805 // Consume the ';' - it's optional unless we have a delete or default 1806 if (Tok.is(tok::semi)) { 1807 ConsumeToken(); 1808 } 1809 1810 return; 1811 } 1812 } 1813 1814 // member-declarator-list: 1815 // member-declarator 1816 // member-declarator-list ',' member-declarator 1817 1818 SmallVector<Decl *, 8> DeclsInGroup; 1819 ExprResult BitfieldSize; 1820 1821 while (1) { 1822 // member-declarator: 1823 // declarator pure-specifier[opt] 1824 // declarator brace-or-equal-initializer[opt] 1825 // identifier[opt] ':' constant-expression 1826 if (Tok.is(tok::colon)) { 1827 ConsumeToken(); 1828 BitfieldSize = ParseConstantExpression(); 1829 if (BitfieldSize.isInvalid()) 1830 SkipUntil(tok::comma, true, true); 1831 } 1832 1833 // If a simple-asm-expr is present, parse it. 1834 if (Tok.is(tok::kw_asm)) { 1835 SourceLocation Loc; 1836 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1837 if (AsmLabel.isInvalid()) 1838 SkipUntil(tok::comma, true, true); 1839 1840 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1841 DeclaratorInfo.SetRangeEnd(Loc); 1842 } 1843 1844 // If attributes exist after the declarator, parse them. 1845 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 1846 1847 // FIXME: When g++ adds support for this, we'll need to check whether it 1848 // goes before or after the GNU attributes and __asm__. 1849 ParseOptionalCXX0XVirtSpecifierSeq(VS); 1850 1851 bool HasDeferredInitializer = false; 1852 if ((Tok.is(tok::equal) || Tok.is(tok::l_brace)) && !HasInitializer) { 1853 if (BitfieldSize.get()) { 1854 Diag(Tok, diag::err_bitfield_member_init); 1855 SkipUntil(tok::comma, true, true); 1856 } else { 1857 HasInitializer = true; 1858 HasDeferredInitializer = !DeclaratorInfo.isDeclarationOfFunction() && 1859 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1860 != DeclSpec::SCS_static && 1861 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1862 != DeclSpec::SCS_typedef; 1863 } 1864 } 1865 1866 // NOTE: If Sema is the Action module and declarator is an instance field, 1867 // this call will *not* return the created decl; It will return null. 1868 // See Sema::ActOnCXXMemberDeclarator for details. 1869 1870 Decl *ThisDecl = 0; 1871 if (DS.isFriendSpecified()) { 1872 // TODO: handle initializers, bitfields, 'delete' 1873 ThisDecl = Actions.ActOnFriendFunctionDecl(getCurScope(), DeclaratorInfo, 1874 move(TemplateParams)); 1875 } else { 1876 ThisDecl = Actions.ActOnCXXMemberDeclarator(getCurScope(), AS, 1877 DeclaratorInfo, 1878 move(TemplateParams), 1879 BitfieldSize.release(), 1880 VS, HasDeferredInitializer); 1881 if (AccessAttrs) 1882 Actions.ProcessDeclAttributeList(getCurScope(), ThisDecl, AccessAttrs, 1883 false, true); 1884 } 1885 1886 // Set the Decl for any late parsed attributes 1887 for (unsigned i = 0, ni = LateParsedAttrs.size(); i < ni; ++i) { 1888 LateParsedAttrs[i]->setDecl(ThisDecl); 1889 } 1890 LateParsedAttrs.clear(); 1891 1892 // Handle the initializer. 1893 if (HasDeferredInitializer) { 1894 // The initializer was deferred; parse it and cache the tokens. 1895 Diag(Tok, getLang().CPlusPlus0x ? 1896 diag::warn_cxx98_compat_nonstatic_member_init : 1897 diag::ext_nonstatic_member_init); 1898 1899 if (DeclaratorInfo.isArrayOfUnknownBound()) { 1900 // C++0x [dcl.array]p3: An array bound may also be omitted when the 1901 // declarator is followed by an initializer. 1902 // 1903 // A brace-or-equal-initializer for a member-declarator is not an 1904 // initializer in the gramamr, so this is ill-formed. 1905 Diag(Tok, diag::err_incomplete_array_member_init); 1906 SkipUntil(tok::comma, true, true); 1907 // Avoid later warnings about a class member of incomplete type. 1908 ThisDecl->setInvalidDecl(); 1909 } else 1910 ParseCXXNonStaticMemberInitializer(ThisDecl); 1911 } else if (HasInitializer) { 1912 // Normal initializer. 1913 if (!Init.isUsable()) 1914 Init = ParseCXXMemberInitializer( 1915 DeclaratorInfo.isDeclarationOfFunction(), EqualLoc); 1916 1917 if (Init.isInvalid()) 1918 SkipUntil(tok::comma, true, true); 1919 else if (ThisDecl) 1920 Actions.AddInitializerToDecl(ThisDecl, Init.get(), false, 1921 DS.getTypeSpecType() == DeclSpec::TST_auto); 1922 } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1923 // No initializer. 1924 Actions.ActOnUninitializedDecl(ThisDecl, 1925 DS.getTypeSpecType() == DeclSpec::TST_auto); 1926 } 1927 1928 if (ThisDecl) { 1929 Actions.FinalizeDeclaration(ThisDecl); 1930 DeclsInGroup.push_back(ThisDecl); 1931 } 1932 1933 if (DeclaratorInfo.isFunctionDeclarator() && 1934 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1935 != DeclSpec::SCS_typedef) { 1936 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1937 } 1938 1939 DeclaratorInfo.complete(ThisDecl); 1940 1941 // If we don't have a comma, it is either the end of the list (a ';') 1942 // or an error, bail out. 1943 if (Tok.isNot(tok::comma)) 1944 break; 1945 1946 // Consume the comma. 1947 ConsumeToken(); 1948 1949 // Parse the next declarator. 1950 DeclaratorInfo.clear(); 1951 VS.clear(); 1952 BitfieldSize = true; 1953 Init = true; 1954 HasInitializer = false; 1955 1956 // Attributes are only allowed on the second declarator. 1957 MaybeParseGNUAttributes(DeclaratorInfo); 1958 1959 if (Tok.isNot(tok::colon)) 1960 ParseDeclarator(DeclaratorInfo); 1961 } 1962 1963 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1964 // Skip to end of block or statement. 1965 SkipUntil(tok::r_brace, true, true); 1966 // If we stopped at a ';', eat it. 1967 if (Tok.is(tok::semi)) ConsumeToken(); 1968 return; 1969 } 1970 1971 Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup.data(), 1972 DeclsInGroup.size()); 1973} 1974 1975/// ParseCXXMemberInitializer - Parse the brace-or-equal-initializer or 1976/// pure-specifier. Also detect and reject any attempted defaulted/deleted 1977/// function definition. The location of the '=', if any, will be placed in 1978/// EqualLoc. 1979/// 1980/// pure-specifier: 1981/// '= 0' 1982/// 1983/// brace-or-equal-initializer: 1984/// '=' initializer-expression 1985/// braced-init-list [TODO] 1986/// 1987/// initializer-clause: 1988/// assignment-expression 1989/// braced-init-list [TODO] 1990/// 1991/// defaulted/deleted function-definition: 1992/// '=' 'default' 1993/// '=' 'delete' 1994/// 1995/// Prior to C++0x, the assignment-expression in an initializer-clause must 1996/// be a constant-expression. 1997ExprResult Parser::ParseCXXMemberInitializer(bool IsFunction, 1998 SourceLocation &EqualLoc) { 1999 assert((Tok.is(tok::equal) || Tok.is(tok::l_brace)) 2000 && "Data member initializer not starting with '=' or '{'"); 2001 2002 if (Tok.is(tok::equal)) { 2003 EqualLoc = ConsumeToken(); 2004 if (Tok.is(tok::kw_delete)) { 2005 // In principle, an initializer of '= delete p;' is legal, but it will 2006 // never type-check. It's better to diagnose it as an ill-formed expression 2007 // than as an ill-formed deleted non-function member. 2008 // An initializer of '= delete p, foo' will never be parsed, because 2009 // a top-level comma always ends the initializer expression. 2010 const Token &Next = NextToken(); 2011 if (IsFunction || Next.is(tok::semi) || Next.is(tok::comma) || 2012 Next.is(tok::eof)) { 2013 if (IsFunction) 2014 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 2015 << 1 /* delete */; 2016 else 2017 Diag(ConsumeToken(), diag::err_deleted_non_function); 2018 return ExprResult(); 2019 } 2020 } else if (Tok.is(tok::kw_default)) { 2021 if (IsFunction) 2022 Diag(Tok, diag::err_default_delete_in_multiple_declaration) 2023 << 0 /* default */; 2024 else 2025 Diag(ConsumeToken(), diag::err_default_special_members); 2026 return ExprResult(); 2027 } 2028 2029 return ParseInitializer(); 2030 } else 2031 return ExprError(Diag(Tok, diag::err_generalized_initializer_lists)); 2032} 2033 2034/// ParseCXXMemberSpecification - Parse the class definition. 2035/// 2036/// member-specification: 2037/// member-declaration member-specification[opt] 2038/// access-specifier ':' member-specification[opt] 2039/// 2040void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 2041 unsigned TagType, Decl *TagDecl) { 2042 assert((TagType == DeclSpec::TST_struct || 2043 TagType == DeclSpec::TST_union || 2044 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 2045 2046 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 2047 "parsing struct/union/class body"); 2048 2049 // Determine whether this is a non-nested class. Note that local 2050 // classes are *not* considered to be nested classes. 2051 bool NonNestedClass = true; 2052 if (!ClassStack.empty()) { 2053 for (const Scope *S = getCurScope(); S; S = S->getParent()) { 2054 if (S->isClassScope()) { 2055 // We're inside a class scope, so this is a nested class. 2056 NonNestedClass = false; 2057 break; 2058 } 2059 2060 if ((S->getFlags() & Scope::FnScope)) { 2061 // If we're in a function or function template declared in the 2062 // body of a class, then this is a local class rather than a 2063 // nested class. 2064 const Scope *Parent = S->getParent(); 2065 if (Parent->isTemplateParamScope()) 2066 Parent = Parent->getParent(); 2067 if (Parent->isClassScope()) 2068 break; 2069 } 2070 } 2071 } 2072 2073 // Enter a scope for the class. 2074 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 2075 2076 // Note that we are parsing a new (potentially-nested) class definition. 2077 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 2078 2079 if (TagDecl) 2080 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 2081 2082 SourceLocation FinalLoc; 2083 2084 // Parse the optional 'final' keyword. 2085 if (getLang().CPlusPlus && Tok.is(tok::identifier)) { 2086 assert(isCXX0XFinalKeyword() && "not a class definition"); 2087 FinalLoc = ConsumeToken(); 2088 2089 Diag(FinalLoc, getLang().CPlusPlus0x ? 2090 diag::warn_cxx98_compat_override_control_keyword : 2091 diag::ext_override_control_keyword) << "final"; 2092 } 2093 2094 if (Tok.is(tok::colon)) { 2095 ParseBaseClause(TagDecl); 2096 2097 if (!Tok.is(tok::l_brace)) { 2098 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 2099 2100 if (TagDecl) 2101 Actions.ActOnTagDefinitionError(getCurScope(), TagDecl); 2102 return; 2103 } 2104 } 2105 2106 assert(Tok.is(tok::l_brace)); 2107 BalancedDelimiterTracker T(*this, tok::l_brace); 2108 T.consumeOpen(); 2109 2110 if (TagDecl) 2111 Actions.ActOnStartCXXMemberDeclarations(getCurScope(), TagDecl, FinalLoc, 2112 T.getOpenLocation()); 2113 2114 // C++ 11p3: Members of a class defined with the keyword class are private 2115 // by default. Members of a class defined with the keywords struct or union 2116 // are public by default. 2117 AccessSpecifier CurAS; 2118 if (TagType == DeclSpec::TST_class) 2119 CurAS = AS_private; 2120 else 2121 CurAS = AS_public; 2122 ParsedAttributes AccessAttrs(AttrFactory); 2123 2124 if (TagDecl) { 2125 // While we still have something to read, read the member-declarations. 2126 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2127 // Each iteration of this loop reads one member-declaration. 2128 2129 if (getLang().MicrosoftExt && (Tok.is(tok::kw___if_exists) || 2130 Tok.is(tok::kw___if_not_exists))) { 2131 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2132 continue; 2133 } 2134 2135 // Check for extraneous top-level semicolon. 2136 if (Tok.is(tok::semi)) { 2137 Diag(Tok, diag::ext_extra_struct_semi) 2138 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2139 << FixItHint::CreateRemoval(Tok.getLocation()); 2140 ConsumeToken(); 2141 continue; 2142 } 2143 2144 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2145 if (AS != AS_none) { 2146 // Current token is a C++ access specifier. 2147 CurAS = AS; 2148 SourceLocation ASLoc = Tok.getLocation(); 2149 unsigned TokLength = Tok.getLength(); 2150 ConsumeToken(); 2151 AccessAttrs.clear(); 2152 MaybeParseGNUAttributes(AccessAttrs); 2153 2154 SourceLocation EndLoc; 2155 if (Tok.is(tok::colon)) { 2156 EndLoc = Tok.getLocation(); 2157 ConsumeToken(); 2158 } else if (Tok.is(tok::semi)) { 2159 EndLoc = Tok.getLocation(); 2160 ConsumeToken(); 2161 Diag(EndLoc, diag::err_expected_colon) 2162 << FixItHint::CreateReplacement(EndLoc, ":"); 2163 } else { 2164 EndLoc = ASLoc.getLocWithOffset(TokLength); 2165 Diag(EndLoc, diag::err_expected_colon) 2166 << FixItHint::CreateInsertion(EndLoc, ":"); 2167 } 2168 2169 if (Actions.ActOnAccessSpecifier(AS, ASLoc, EndLoc, 2170 AccessAttrs.getList())) { 2171 // found another attribute than only annotations 2172 AccessAttrs.clear(); 2173 } 2174 2175 continue; 2176 } 2177 2178 // FIXME: Make sure we don't have a template here. 2179 2180 // Parse all the comma separated declarators. 2181 ParseCXXClassMemberDeclaration(CurAS, AccessAttrs.getList()); 2182 } 2183 2184 T.consumeClose(); 2185 } else { 2186 SkipUntil(tok::r_brace, false, false); 2187 } 2188 2189 // If attributes exist after class contents, parse them. 2190 ParsedAttributes attrs(AttrFactory); 2191 MaybeParseGNUAttributes(attrs); 2192 2193 if (TagDecl) 2194 Actions.ActOnFinishCXXMemberSpecification(getCurScope(), RecordLoc, TagDecl, 2195 T.getOpenLocation(), 2196 T.getCloseLocation(), 2197 attrs.getList()); 2198 2199 // C++0x [class.mem]p2: Within the class member-specification, the class is 2200 // regarded as complete within function bodies, default arguments, exception- 2201 // specifications, and brace-or-equal-initializers for non-static data 2202 // members (including such things in nested classes). 2203 // 2204 // FIXME: Only function bodies and brace-or-equal-initializers are currently 2205 // handled. Fix the others! 2206 if (TagDecl && NonNestedClass) { 2207 // We are not inside a nested class. This class and its nested classes 2208 // are complete and we can parse the delayed portions of method 2209 // declarations and the lexed inline method definitions, along with any 2210 // delayed attributes. 2211 SourceLocation SavedPrevTokLocation = PrevTokLocation; 2212 ParseLexedAttributes(getCurrentClass()); 2213 ParseLexedMethodDeclarations(getCurrentClass()); 2214 ParseLexedMemberInitializers(getCurrentClass()); 2215 ParseLexedMethodDefs(getCurrentClass()); 2216 PrevTokLocation = SavedPrevTokLocation; 2217 } 2218 2219 if (TagDecl) 2220 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 2221 T.getCloseLocation()); 2222 2223 // Leave the class scope. 2224 ParsingDef.Pop(); 2225 ClassScope.Exit(); 2226} 2227 2228/// ParseConstructorInitializer - Parse a C++ constructor initializer, 2229/// which explicitly initializes the members or base classes of a 2230/// class (C++ [class.base.init]). For example, the three initializers 2231/// after the ':' in the Derived constructor below: 2232/// 2233/// @code 2234/// class Base { }; 2235/// class Derived : Base { 2236/// int x; 2237/// float f; 2238/// public: 2239/// Derived(float f) : Base(), x(17), f(f) { } 2240/// }; 2241/// @endcode 2242/// 2243/// [C++] ctor-initializer: 2244/// ':' mem-initializer-list 2245/// 2246/// [C++] mem-initializer-list: 2247/// mem-initializer ...[opt] 2248/// mem-initializer ...[opt] , mem-initializer-list 2249void Parser::ParseConstructorInitializer(Decl *ConstructorDecl) { 2250 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 2251 2252 // Poison the SEH identifiers so they are flagged as illegal in constructor initializers 2253 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true); 2254 SourceLocation ColonLoc = ConsumeToken(); 2255 2256 SmallVector<CXXCtorInitializer*, 4> MemInitializers; 2257 bool AnyErrors = false; 2258 2259 do { 2260 if (Tok.is(tok::code_completion)) { 2261 Actions.CodeCompleteConstructorInitializer(ConstructorDecl, 2262 MemInitializers.data(), 2263 MemInitializers.size()); 2264 return cutOffParsing(); 2265 } else { 2266 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 2267 if (!MemInit.isInvalid()) 2268 MemInitializers.push_back(MemInit.get()); 2269 else 2270 AnyErrors = true; 2271 } 2272 2273 if (Tok.is(tok::comma)) 2274 ConsumeToken(); 2275 else if (Tok.is(tok::l_brace)) 2276 break; 2277 // If the next token looks like a base or member initializer, assume that 2278 // we're just missing a comma. 2279 else if (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) { 2280 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 2281 Diag(Loc, diag::err_ctor_init_missing_comma) 2282 << FixItHint::CreateInsertion(Loc, ", "); 2283 } else { 2284 // Skip over garbage, until we get to '{'. Don't eat the '{'. 2285 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 2286 SkipUntil(tok::l_brace, true, true); 2287 break; 2288 } 2289 } while (true); 2290 2291 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 2292 MemInitializers.data(), MemInitializers.size(), 2293 AnyErrors); 2294} 2295 2296/// ParseMemInitializer - Parse a C++ member initializer, which is 2297/// part of a constructor initializer that explicitly initializes one 2298/// member or base class (C++ [class.base.init]). See 2299/// ParseConstructorInitializer for an example. 2300/// 2301/// [C++] mem-initializer: 2302/// mem-initializer-id '(' expression-list[opt] ')' 2303/// [C++0x] mem-initializer-id braced-init-list 2304/// 2305/// [C++] mem-initializer-id: 2306/// '::'[opt] nested-name-specifier[opt] class-name 2307/// identifier 2308Parser::MemInitResult Parser::ParseMemInitializer(Decl *ConstructorDecl) { 2309 // parse '::'[opt] nested-name-specifier[opt] 2310 CXXScopeSpec SS; 2311 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 2312 ParsedType TemplateTypeTy; 2313 if (Tok.is(tok::annot_template_id)) { 2314 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2315 if (TemplateId->Kind == TNK_Type_template || 2316 TemplateId->Kind == TNK_Dependent_template_name) { 2317 AnnotateTemplateIdTokenAsType(); 2318 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 2319 TemplateTypeTy = getTypeAnnotation(Tok); 2320 } 2321 } 2322 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 2323 Diag(Tok, diag::err_expected_member_or_base_name); 2324 return true; 2325 } 2326 2327 // Get the identifier. This may be a member name or a class name, 2328 // but we'll let the semantic analysis determine which it is. 2329 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 2330 SourceLocation IdLoc = ConsumeToken(); 2331 2332 // Parse the '('. 2333 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2334 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2335 2336 ExprResult InitList = ParseBraceInitializer(); 2337 if (InitList.isInvalid()) 2338 return true; 2339 2340 SourceLocation EllipsisLoc; 2341 if (Tok.is(tok::ellipsis)) 2342 EllipsisLoc = ConsumeToken(); 2343 2344 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2345 TemplateTypeTy, IdLoc, InitList.take(), 2346 EllipsisLoc); 2347 } else if(Tok.is(tok::l_paren)) { 2348 BalancedDelimiterTracker T(*this, tok::l_paren); 2349 T.consumeOpen(); 2350 2351 // Parse the optional expression-list. 2352 ExprVector ArgExprs(Actions); 2353 CommaLocsTy CommaLocs; 2354 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 2355 SkipUntil(tok::r_paren); 2356 return true; 2357 } 2358 2359 T.consumeClose(); 2360 2361 SourceLocation EllipsisLoc; 2362 if (Tok.is(tok::ellipsis)) 2363 EllipsisLoc = ConsumeToken(); 2364 2365 return Actions.ActOnMemInitializer(ConstructorDecl, getCurScope(), SS, II, 2366 TemplateTypeTy, IdLoc, 2367 T.getOpenLocation(), ArgExprs.take(), 2368 ArgExprs.size(), T.getCloseLocation(), 2369 EllipsisLoc); 2370 } 2371 2372 Diag(Tok, getLang().CPlusPlus0x ? diag::err_expected_lparen_or_lbrace 2373 : diag::err_expected_lparen); 2374 return true; 2375} 2376 2377/// \brief Parse a C++ exception-specification if present (C++0x [except.spec]). 2378/// 2379/// exception-specification: 2380/// dynamic-exception-specification 2381/// noexcept-specification 2382/// 2383/// noexcept-specification: 2384/// 'noexcept' 2385/// 'noexcept' '(' constant-expression ')' 2386ExceptionSpecificationType 2387Parser::MaybeParseExceptionSpecification(SourceRange &SpecificationRange, 2388 SmallVectorImpl<ParsedType> &DynamicExceptions, 2389 SmallVectorImpl<SourceRange> &DynamicExceptionRanges, 2390 ExprResult &NoexceptExpr) { 2391 ExceptionSpecificationType Result = EST_None; 2392 2393 // See if there's a dynamic specification. 2394 if (Tok.is(tok::kw_throw)) { 2395 Result = ParseDynamicExceptionSpecification(SpecificationRange, 2396 DynamicExceptions, 2397 DynamicExceptionRanges); 2398 assert(DynamicExceptions.size() == DynamicExceptionRanges.size() && 2399 "Produced different number of exception types and ranges."); 2400 } 2401 2402 // If there's no noexcept specification, we're done. 2403 if (Tok.isNot(tok::kw_noexcept)) 2404 return Result; 2405 2406 Diag(Tok, diag::warn_cxx98_compat_noexcept_decl); 2407 2408 // If we already had a dynamic specification, parse the noexcept for, 2409 // recovery, but emit a diagnostic and don't store the results. 2410 SourceRange NoexceptRange; 2411 ExceptionSpecificationType NoexceptType = EST_None; 2412 2413 SourceLocation KeywordLoc = ConsumeToken(); 2414 if (Tok.is(tok::l_paren)) { 2415 // There is an argument. 2416 BalancedDelimiterTracker T(*this, tok::l_paren); 2417 T.consumeOpen(); 2418 NoexceptType = EST_ComputedNoexcept; 2419 NoexceptExpr = ParseConstantExpression(); 2420 // The argument must be contextually convertible to bool. We use 2421 // ActOnBooleanCondition for this purpose. 2422 if (!NoexceptExpr.isInvalid()) 2423 NoexceptExpr = Actions.ActOnBooleanCondition(getCurScope(), KeywordLoc, 2424 NoexceptExpr.get()); 2425 T.consumeClose(); 2426 NoexceptRange = SourceRange(KeywordLoc, T.getCloseLocation()); 2427 } else { 2428 // There is no argument. 2429 NoexceptType = EST_BasicNoexcept; 2430 NoexceptRange = SourceRange(KeywordLoc, KeywordLoc); 2431 } 2432 2433 if (Result == EST_None) { 2434 SpecificationRange = NoexceptRange; 2435 Result = NoexceptType; 2436 2437 // If there's a dynamic specification after a noexcept specification, 2438 // parse that and ignore the results. 2439 if (Tok.is(tok::kw_throw)) { 2440 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2441 ParseDynamicExceptionSpecification(NoexceptRange, DynamicExceptions, 2442 DynamicExceptionRanges); 2443 } 2444 } else { 2445 Diag(Tok.getLocation(), diag::err_dynamic_and_noexcept_specification); 2446 } 2447 2448 return Result; 2449} 2450 2451/// ParseDynamicExceptionSpecification - Parse a C++ 2452/// dynamic-exception-specification (C++ [except.spec]). 2453/// 2454/// dynamic-exception-specification: 2455/// 'throw' '(' type-id-list [opt] ')' 2456/// [MS] 'throw' '(' '...' ')' 2457/// 2458/// type-id-list: 2459/// type-id ... [opt] 2460/// type-id-list ',' type-id ... [opt] 2461/// 2462ExceptionSpecificationType Parser::ParseDynamicExceptionSpecification( 2463 SourceRange &SpecificationRange, 2464 SmallVectorImpl<ParsedType> &Exceptions, 2465 SmallVectorImpl<SourceRange> &Ranges) { 2466 assert(Tok.is(tok::kw_throw) && "expected throw"); 2467 2468 SpecificationRange.setBegin(ConsumeToken()); 2469 BalancedDelimiterTracker T(*this, tok::l_paren); 2470 if (T.consumeOpen()) { 2471 Diag(Tok, diag::err_expected_lparen_after) << "throw"; 2472 SpecificationRange.setEnd(SpecificationRange.getBegin()); 2473 return EST_DynamicNone; 2474 } 2475 2476 // Parse throw(...), a Microsoft extension that means "this function 2477 // can throw anything". 2478 if (Tok.is(tok::ellipsis)) { 2479 SourceLocation EllipsisLoc = ConsumeToken(); 2480 if (!getLang().MicrosoftExt) 2481 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 2482 T.consumeClose(); 2483 SpecificationRange.setEnd(T.getCloseLocation()); 2484 return EST_MSAny; 2485 } 2486 2487 // Parse the sequence of type-ids. 2488 SourceRange Range; 2489 while (Tok.isNot(tok::r_paren)) { 2490 TypeResult Res(ParseTypeName(&Range)); 2491 2492 if (Tok.is(tok::ellipsis)) { 2493 // C++0x [temp.variadic]p5: 2494 // - In a dynamic-exception-specification (15.4); the pattern is a 2495 // type-id. 2496 SourceLocation Ellipsis = ConsumeToken(); 2497 Range.setEnd(Ellipsis); 2498 if (!Res.isInvalid()) 2499 Res = Actions.ActOnPackExpansion(Res.get(), Ellipsis); 2500 } 2501 2502 if (!Res.isInvalid()) { 2503 Exceptions.push_back(Res.get()); 2504 Ranges.push_back(Range); 2505 } 2506 2507 if (Tok.is(tok::comma)) 2508 ConsumeToken(); 2509 else 2510 break; 2511 } 2512 2513 T.consumeClose(); 2514 SpecificationRange.setEnd(T.getCloseLocation()); 2515 return Exceptions.empty() ? EST_DynamicNone : EST_Dynamic; 2516} 2517 2518/// ParseTrailingReturnType - Parse a trailing return type on a new-style 2519/// function declaration. 2520TypeResult Parser::ParseTrailingReturnType(SourceRange &Range) { 2521 assert(Tok.is(tok::arrow) && "expected arrow"); 2522 2523 ConsumeToken(); 2524 2525 // FIXME: Need to suppress declarations when parsing this typename. 2526 // Otherwise in this function definition: 2527 // 2528 // auto f() -> struct X {} 2529 // 2530 // struct X is parsed as class definition because of the trailing 2531 // brace. 2532 return ParseTypeName(&Range); 2533} 2534 2535/// \brief We have just started parsing the definition of a new class, 2536/// so push that class onto our stack of classes that is currently 2537/// being parsed. 2538Sema::ParsingClassState 2539Parser::PushParsingClass(Decl *ClassDecl, bool NonNestedClass) { 2540 assert((NonNestedClass || !ClassStack.empty()) && 2541 "Nested class without outer class"); 2542 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 2543 return Actions.PushParsingClass(); 2544} 2545 2546/// \brief Deallocate the given parsed class and all of its nested 2547/// classes. 2548void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 2549 for (unsigned I = 0, N = Class->LateParsedDeclarations.size(); I != N; ++I) 2550 delete Class->LateParsedDeclarations[I]; 2551 delete Class; 2552} 2553 2554/// \brief Pop the top class of the stack of classes that are 2555/// currently being parsed. 2556/// 2557/// This routine should be called when we have finished parsing the 2558/// definition of a class, but have not yet popped the Scope 2559/// associated with the class's definition. 2560/// 2561/// \returns true if the class we've popped is a top-level class, 2562/// false otherwise. 2563void Parser::PopParsingClass(Sema::ParsingClassState state) { 2564 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 2565 2566 Actions.PopParsingClass(state); 2567 2568 ParsingClass *Victim = ClassStack.top(); 2569 ClassStack.pop(); 2570 if (Victim->TopLevelClass) { 2571 // Deallocate all of the nested classes of this class, 2572 // recursively: we don't need to keep any of this information. 2573 DeallocateParsedClasses(Victim); 2574 return; 2575 } 2576 assert(!ClassStack.empty() && "Missing top-level class?"); 2577 2578 if (Victim->LateParsedDeclarations.empty()) { 2579 // The victim is a nested class, but we will not need to perform 2580 // any processing after the definition of this class since it has 2581 // no members whose handling was delayed. Therefore, we can just 2582 // remove this nested class. 2583 DeallocateParsedClasses(Victim); 2584 return; 2585 } 2586 2587 // This nested class has some members that will need to be processed 2588 // after the top-level class is completely defined. Therefore, add 2589 // it to the list of nested classes within its parent. 2590 assert(getCurScope()->isClassScope() && "Nested class outside of class scope?"); 2591 ClassStack.top()->LateParsedDeclarations.push_back(new LateParsedClass(this, Victim)); 2592 Victim->TemplateScope = getCurScope()->getParent()->isTemplateParamScope(); 2593} 2594 2595/// ParseCXX0XAttributeSpecifier - Parse a C++0x attribute-specifier. Currently 2596/// only parses standard attributes. 2597/// 2598/// [C++0x] attribute-specifier: 2599/// '[' '[' attribute-list ']' ']' 2600/// alignment-specifier 2601/// 2602/// [C++0x] attribute-list: 2603/// attribute[opt] 2604/// attribute-list ',' attribute[opt] 2605/// 2606/// [C++0x] attribute: 2607/// attribute-token attribute-argument-clause[opt] 2608/// 2609/// [C++0x] attribute-token: 2610/// identifier 2611/// attribute-scoped-token 2612/// 2613/// [C++0x] attribute-scoped-token: 2614/// attribute-namespace '::' identifier 2615/// 2616/// [C++0x] attribute-namespace: 2617/// identifier 2618/// 2619/// [C++0x] attribute-argument-clause: 2620/// '(' balanced-token-seq ')' 2621/// 2622/// [C++0x] balanced-token-seq: 2623/// balanced-token 2624/// balanced-token-seq balanced-token 2625/// 2626/// [C++0x] balanced-token: 2627/// '(' balanced-token-seq ')' 2628/// '[' balanced-token-seq ']' 2629/// '{' balanced-token-seq '}' 2630/// any token but '(', ')', '[', ']', '{', or '}' 2631void Parser::ParseCXX0XAttributeSpecifier(ParsedAttributes &attrs, 2632 SourceLocation *endLoc) { 2633 if (Tok.is(tok::kw_alignas)) { 2634 Diag(Tok.getLocation(), diag::warn_cxx98_compat_alignas); 2635 ParseAlignmentSpecifier(attrs, endLoc); 2636 return; 2637 } 2638 2639 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 2640 && "Not a C++0x attribute list"); 2641 2642 Diag(Tok.getLocation(), diag::warn_cxx98_compat_attribute); 2643 2644 ConsumeBracket(); 2645 ConsumeBracket(); 2646 2647 if (Tok.is(tok::comma)) { 2648 Diag(Tok.getLocation(), diag::err_expected_ident); 2649 ConsumeToken(); 2650 } 2651 2652 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 2653 // attribute not present 2654 if (Tok.is(tok::comma)) { 2655 ConsumeToken(); 2656 continue; 2657 } 2658 2659 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 2660 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 2661 2662 // scoped attribute 2663 if (Tok.is(tok::coloncolon)) { 2664 ConsumeToken(); 2665 2666 if (!Tok.is(tok::identifier)) { 2667 Diag(Tok.getLocation(), diag::err_expected_ident); 2668 SkipUntil(tok::r_square, tok::comma, true, true); 2669 continue; 2670 } 2671 2672 ScopeName = AttrName; 2673 ScopeLoc = AttrLoc; 2674 2675 AttrName = Tok.getIdentifierInfo(); 2676 AttrLoc = ConsumeToken(); 2677 } 2678 2679 bool AttrParsed = false; 2680 // No scoped names are supported; ideally we could put all non-standard 2681 // attributes into namespaces. 2682 if (!ScopeName) { 2683 switch(AttributeList::getKind(AttrName)) 2684 { 2685 // No arguments 2686 case AttributeList::AT_carries_dependency: 2687 case AttributeList::AT_noreturn: { 2688 if (Tok.is(tok::l_paren)) { 2689 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 2690 << AttrName->getName(); 2691 break; 2692 } 2693 2694 attrs.addNew(AttrName, AttrLoc, 0, AttrLoc, 0, 2695 SourceLocation(), 0, 0, false, true); 2696 AttrParsed = true; 2697 break; 2698 } 2699 2700 // Silence warnings 2701 default: break; 2702 } 2703 } 2704 2705 // Skip the entire parameter clause, if any 2706 if (!AttrParsed && Tok.is(tok::l_paren)) { 2707 ConsumeParen(); 2708 // SkipUntil maintains the balancedness of tokens. 2709 SkipUntil(tok::r_paren, false); 2710 } 2711 } 2712 2713 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2714 SkipUntil(tok::r_square, false); 2715 if (endLoc) 2716 *endLoc = Tok.getLocation(); 2717 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 2718 SkipUntil(tok::r_square, false); 2719} 2720 2721/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier-seq. 2722/// 2723/// attribute-specifier-seq: 2724/// attribute-specifier-seq[opt] attribute-specifier 2725void Parser::ParseCXX0XAttributes(ParsedAttributesWithRange &attrs, 2726 SourceLocation *endLoc) { 2727 SourceLocation StartLoc = Tok.getLocation(), Loc; 2728 if (!endLoc) 2729 endLoc = &Loc; 2730 2731 do { 2732 ParseCXX0XAttributeSpecifier(attrs, endLoc); 2733 } while (isCXX0XAttributeSpecifier()); 2734 2735 attrs.Range = SourceRange(StartLoc, *endLoc); 2736} 2737 2738/// ParseMicrosoftAttributes - Parse a Microsoft attribute [Attr] 2739/// 2740/// [MS] ms-attribute: 2741/// '[' token-seq ']' 2742/// 2743/// [MS] ms-attribute-seq: 2744/// ms-attribute[opt] 2745/// ms-attribute ms-attribute-seq 2746void Parser::ParseMicrosoftAttributes(ParsedAttributes &attrs, 2747 SourceLocation *endLoc) { 2748 assert(Tok.is(tok::l_square) && "Not a Microsoft attribute list"); 2749 2750 while (Tok.is(tok::l_square)) { 2751 ConsumeBracket(); 2752 SkipUntil(tok::r_square, true, true); 2753 if (endLoc) *endLoc = Tok.getLocation(); 2754 ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); 2755 } 2756} 2757 2758void Parser::ParseMicrosoftIfExistsClassDeclaration(DeclSpec::TST TagType, 2759 AccessSpecifier& CurAS) { 2760 IfExistsCondition Result; 2761 if (ParseMicrosoftIfExistsCondition(Result)) 2762 return; 2763 2764 BalancedDelimiterTracker Braces(*this, tok::l_brace); 2765 if (Braces.consumeOpen()) { 2766 Diag(Tok, diag::err_expected_lbrace); 2767 return; 2768 } 2769 2770 switch (Result.Behavior) { 2771 case IEB_Parse: 2772 // Parse the declarations below. 2773 break; 2774 2775 case IEB_Dependent: 2776 Diag(Result.KeywordLoc, diag::warn_microsoft_dependent_exists) 2777 << Result.IsIfExists; 2778 // Fall through to skip. 2779 2780 case IEB_Skip: 2781 Braces.skipToEnd(); 2782 return; 2783 } 2784 2785 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 2786 // __if_exists, __if_not_exists can nest. 2787 if ((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists))) { 2788 ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType, CurAS); 2789 continue; 2790 } 2791 2792 // Check for extraneous top-level semicolon. 2793 if (Tok.is(tok::semi)) { 2794 Diag(Tok, diag::ext_extra_struct_semi) 2795 << DeclSpec::getSpecifierName((DeclSpec::TST)TagType) 2796 << FixItHint::CreateRemoval(Tok.getLocation()); 2797 ConsumeToken(); 2798 continue; 2799 } 2800 2801 AccessSpecifier AS = getAccessSpecifierIfPresent(); 2802 if (AS != AS_none) { 2803 // Current token is a C++ access specifier. 2804 CurAS = AS; 2805 SourceLocation ASLoc = Tok.getLocation(); 2806 ConsumeToken(); 2807 if (Tok.is(tok::colon)) 2808 Actions.ActOnAccessSpecifier(AS, ASLoc, Tok.getLocation()); 2809 else 2810 Diag(Tok, diag::err_expected_colon); 2811 ConsumeToken(); 2812 continue; 2813 } 2814 2815 // Parse all the comma separated declarators. 2816 ParseCXXClassMemberDeclaration(CurAS, 0); 2817 } 2818 2819 Braces.consumeClose(); 2820} 2821