ParseDeclCXX.cpp revision 208954
1296936Smmel//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===// 2296936Smmel// 3296936Smmel// The LLVM Compiler Infrastructure 4296936Smmel// 5296936Smmel// This file is distributed under the University of Illinois Open Source 6296936Smmel// License. See LICENSE.TXT for details. 7296936Smmel// 8296936Smmel//===----------------------------------------------------------------------===// 9296936Smmel// 10296936Smmel// This file implements the C++ Declaration portions of the Parser interfaces. 11296936Smmel// 12296936Smmel//===----------------------------------------------------------------------===// 13296936Smmel 14296936Smmel#include "clang/Basic/OperatorKinds.h" 15296936Smmel#include "clang/Parse/Parser.h" 16296936Smmel#include "clang/Parse/ParseDiagnostic.h" 17296936Smmel#include "clang/Parse/DeclSpec.h" 18296936Smmel#include "clang/Parse/Scope.h" 19296936Smmel#include "clang/Parse/Template.h" 20296936Smmel#include "RAIIObjectsForParser.h" 21296936Smmelusing namespace clang; 22296936Smmel 23296936Smmel/// ParseNamespace - We know that the current token is a namespace keyword. This 24296936Smmel/// may either be a top level namespace or a block-level namespace alias. 25296936Smmel/// 26296936Smmel/// namespace-definition: [C++ 7.3: basic.namespace] 27296936Smmel/// named-namespace-definition 28296936Smmel/// unnamed-namespace-definition 29296936Smmel/// 30296936Smmel/// unnamed-namespace-definition: 31296936Smmel/// 'namespace' attributes[opt] '{' namespace-body '}' 32296936Smmel/// 33296936Smmel/// named-namespace-definition: 34296936Smmel/// original-namespace-definition 35296936Smmel/// extension-namespace-definition 36296936Smmel/// 37296936Smmel/// original-namespace-definition: 38296936Smmel/// 'namespace' identifier attributes[opt] '{' namespace-body '}' 39296936Smmel/// 40296936Smmel/// extension-namespace-definition: 41296936Smmel/// 'namespace' original-namespace-name '{' namespace-body '}' 42296936Smmel/// 43296936Smmel/// namespace-alias-definition: [C++ 7.3.2: namespace.alias] 44296936Smmel/// 'namespace' identifier '=' qualified-namespace-specifier ';' 45296936Smmel/// 46296936SmmelParser::DeclPtrTy Parser::ParseNamespace(unsigned Context, 47296936Smmel SourceLocation &DeclEnd) { 48296936Smmel assert(Tok.is(tok::kw_namespace) && "Not a namespace!"); 49296936Smmel SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'. 50296936Smmel 51296936Smmel if (Tok.is(tok::code_completion)) { 52296936Smmel Actions.CodeCompleteNamespaceDecl(CurScope); 53296936Smmel ConsumeCodeCompletionToken(); 54296936Smmel } 55296936Smmel 56296936Smmel SourceLocation IdentLoc; 57296936Smmel IdentifierInfo *Ident = 0; 58296936Smmel 59296936Smmel Token attrTok; 60296936Smmel 61296936Smmel if (Tok.is(tok::identifier)) { 62296936Smmel Ident = Tok.getIdentifierInfo(); 63296936Smmel IdentLoc = ConsumeToken(); // eat the identifier. 64296936Smmel } 65296936Smmel 66296936Smmel // Read label attributes, if present. 67296936Smmel llvm::OwningPtr<AttributeList> AttrList; 68296936Smmel if (Tok.is(tok::kw___attribute)) { 69296936Smmel attrTok = Tok; 70296936Smmel 71296936Smmel // FIXME: save these somewhere. 72296936Smmel AttrList.reset(ParseGNUAttributes()); 73296936Smmel } 74296936Smmel 75296936Smmel if (Tok.is(tok::equal)) { 76296936Smmel if (AttrList) 77296936Smmel Diag(attrTok, diag::err_unexpected_namespace_attributes_alias); 78296936Smmel 79296936Smmel return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd); 80296936Smmel } 81296936Smmel 82296936Smmel if (Tok.isNot(tok::l_brace)) { 83296936Smmel Diag(Tok, Ident ? diag::err_expected_lbrace : 84296936Smmel diag::err_expected_ident_lbrace); 85296936Smmel return DeclPtrTy(); 86296936Smmel } 87296936Smmel 88296936Smmel SourceLocation LBrace = ConsumeBrace(); 89296936Smmel 90296936Smmel if (CurScope->isClassScope() || CurScope->isTemplateParamScope() || 91296936Smmel CurScope->isInObjcMethodScope() || CurScope->getBlockParent() || 92296936Smmel CurScope->getFnParent()) { 93296936Smmel Diag(LBrace, diag::err_namespace_nonnamespace_scope); 94296936Smmel SkipUntil(tok::r_brace, false); 95296936Smmel return DeclPtrTy(); 96296936Smmel } 97296936Smmel 98296936Smmel // Enter a scope for the namespace. 99296936Smmel ParseScope NamespaceScope(this, Scope::DeclScope); 100296936Smmel 101296936Smmel DeclPtrTy NamespcDecl = 102296936Smmel Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace, 103296936Smmel AttrList.get()); 104296936Smmel 105296936Smmel PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions, 106296936Smmel PP.getSourceManager(), 107296936Smmel "parsing namespace"); 108296936Smmel 109296936Smmel while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 110296936Smmel CXX0XAttributeList Attr; 111296936Smmel if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 112296936Smmel Attr = ParseCXX0XAttributes(); 113296936Smmel ParseExternalDeclaration(Attr); 114296936Smmel } 115296936Smmel 116296936Smmel // Leave the namespace scope. 117296936Smmel NamespaceScope.Exit(); 118296936Smmel 119296936Smmel SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace); 120296936Smmel Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc); 121296936Smmel 122296936Smmel DeclEnd = RBraceLoc; 123296936Smmel return NamespcDecl; 124296936Smmel} 125296936Smmel 126296936Smmel/// ParseNamespaceAlias - Parse the part after the '=' in a namespace 127296936Smmel/// alias definition. 128296936Smmel/// 129296936SmmelParser::DeclPtrTy Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc, 130296936Smmel SourceLocation AliasLoc, 131296936Smmel IdentifierInfo *Alias, 132296936Smmel SourceLocation &DeclEnd) { 133296936Smmel assert(Tok.is(tok::equal) && "Not equal token"); 134296936Smmel 135296936Smmel ConsumeToken(); // eat the '='. 136296936Smmel 137296936Smmel if (Tok.is(tok::code_completion)) { 138296936Smmel Actions.CodeCompleteNamespaceAliasDecl(CurScope); 139296936Smmel ConsumeCodeCompletionToken(); 140296936Smmel } 141296936Smmel 142296936Smmel CXXScopeSpec SS; 143296936Smmel // Parse (optional) nested-name-specifier. 144296936Smmel ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 145296936Smmel 146296936Smmel if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 147296936Smmel Diag(Tok, diag::err_expected_namespace_name); 148296936Smmel // Skip to end of the definition and eat the ';'. 149296936Smmel SkipUntil(tok::semi); 150296936Smmel return DeclPtrTy(); 151296936Smmel } 152296936Smmel 153296936Smmel // Parse identifier. 154296936Smmel IdentifierInfo *Ident = Tok.getIdentifierInfo(); 155296936Smmel SourceLocation IdentLoc = ConsumeToken(); 156296936Smmel 157296936Smmel // Eat the ';'. 158296936Smmel DeclEnd = Tok.getLocation(); 159296936Smmel ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name, 160296936Smmel "", tok::semi); 161296936Smmel 162296936Smmel return Actions.ActOnNamespaceAliasDef(CurScope, NamespaceLoc, AliasLoc, Alias, 163296936Smmel SS, IdentLoc, Ident); 164296936Smmel} 165296936Smmel 166296936Smmel/// ParseLinkage - We know that the current token is a string_literal 167296936Smmel/// and just before that, that extern was seen. 168296936Smmel/// 169296936Smmel/// linkage-specification: [C++ 7.5p2: dcl.link] 170296936Smmel/// 'extern' string-literal '{' declaration-seq[opt] '}' 171296936Smmel/// 'extern' string-literal declaration 172296936Smmel/// 173296936SmmelParser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS, 174296936Smmel unsigned Context) { 175296936Smmel assert(Tok.is(tok::string_literal) && "Not a string literal!"); 176296936Smmel llvm::SmallString<8> LangBuffer; 177296936Smmel // LangBuffer is guaranteed to be big enough. 178296936Smmel bool Invalid = false; 179296936Smmel llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid); 180296936Smmel if (Invalid) 181296936Smmel return DeclPtrTy(); 182296936Smmel 183296936Smmel SourceLocation Loc = ConsumeStringToken(); 184296936Smmel 185296936Smmel ParseScope LinkageScope(this, Scope::DeclScope); 186296936Smmel DeclPtrTy LinkageSpec 187296936Smmel = Actions.ActOnStartLinkageSpecification(CurScope, 188296936Smmel /*FIXME: */SourceLocation(), 189296936Smmel Loc, Lang, 190296936Smmel Tok.is(tok::l_brace)? Tok.getLocation() 191296936Smmel : SourceLocation()); 192296936Smmel 193296936Smmel CXX0XAttributeList Attr; 194296936Smmel if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) { 195296936Smmel Attr = ParseCXX0XAttributes(); 196296936Smmel } 197296936Smmel 198296936Smmel if (Tok.isNot(tok::l_brace)) { 199296936Smmel ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList); 200296936Smmel return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, 201296936Smmel SourceLocation()); 202296936Smmel } 203296936Smmel 204296936Smmel DS.abort(); 205296936Smmel 206296936Smmel if (Attr.HasAttr) 207296936Smmel Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 208296936Smmel << Attr.Range; 209296936Smmel 210296936Smmel SourceLocation LBrace = ConsumeBrace(); 211296936Smmel while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 212296936Smmel CXX0XAttributeList Attr; 213296936Smmel if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 214296936Smmel Attr = ParseCXX0XAttributes(); 215296936Smmel ParseExternalDeclaration(Attr); 216296936Smmel } 217296936Smmel 218296936Smmel SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace); 219296936Smmel return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace); 220296936Smmel} 221296936Smmel 222296936Smmel/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or 223296936Smmel/// using-directive. Assumes that current token is 'using'. 224296936SmmelParser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context, 225296936Smmel SourceLocation &DeclEnd, 226296936Smmel CXX0XAttributeList Attr) { 227296936Smmel assert(Tok.is(tok::kw_using) && "Not using token"); 228296936Smmel 229296936Smmel // Eat 'using'. 230296936Smmel SourceLocation UsingLoc = ConsumeToken(); 231296936Smmel 232296936Smmel if (Tok.is(tok::code_completion)) { 233296936Smmel Actions.CodeCompleteUsing(CurScope); 234296936Smmel ConsumeCodeCompletionToken(); 235296936Smmel } 236296936Smmel 237296936Smmel if (Tok.is(tok::kw_namespace)) 238296936Smmel // Next token after 'using' is 'namespace' so it must be using-directive 239296936Smmel return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList); 240296936Smmel 241296936Smmel if (Attr.HasAttr) 242296936Smmel Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed) 243296936Smmel << Attr.Range; 244296936Smmel 245296936Smmel // Otherwise, it must be using-declaration. 246296936Smmel // Ignore illegal attributes (the caller should already have issued an error. 247296936Smmel return ParseUsingDeclaration(Context, UsingLoc, DeclEnd); 248296936Smmel} 249296936Smmel 250296936Smmel/// ParseUsingDirective - Parse C++ using-directive, assumes 251296936Smmel/// that current token is 'namespace' and 'using' was already parsed. 252296936Smmel/// 253296936Smmel/// using-directive: [C++ 7.3.p4: namespace.udir] 254296936Smmel/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 255296936Smmel/// namespace-name ; 256296936Smmel/// [GNU] using-directive: 257296936Smmel/// 'using' 'namespace' ::[opt] nested-name-specifier[opt] 258296936Smmel/// namespace-name attributes[opt] ; 259296936Smmel/// 260296936SmmelParser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context, 261296936Smmel SourceLocation UsingLoc, 262296936Smmel SourceLocation &DeclEnd, 263296936Smmel AttributeList *Attr) { 264296936Smmel assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token"); 265296936Smmel 266296936Smmel // Eat 'namespace'. 267296936Smmel SourceLocation NamespcLoc = ConsumeToken(); 268296936Smmel 269296936Smmel if (Tok.is(tok::code_completion)) { 270296936Smmel Actions.CodeCompleteUsingDirective(CurScope); 271296936Smmel ConsumeCodeCompletionToken(); 272296936Smmel } 273296936Smmel 274296936Smmel CXXScopeSpec SS; 275296936Smmel // Parse (optional) nested-name-specifier. 276296936Smmel ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 277296936Smmel 278296936Smmel IdentifierInfo *NamespcName = 0; 279296936Smmel SourceLocation IdentLoc = SourceLocation(); 280296936Smmel 281296936Smmel // Parse namespace-name. 282296936Smmel if (SS.isInvalid() || Tok.isNot(tok::identifier)) { 283296936Smmel Diag(Tok, diag::err_expected_namespace_name); 284296936Smmel // If there was invalid namespace name, skip to end of decl, and eat ';'. 285296936Smmel SkipUntil(tok::semi); 286296936Smmel // FIXME: Are there cases, when we would like to call ActOnUsingDirective? 287296936Smmel return DeclPtrTy(); 288296936Smmel } 289296936Smmel 290296936Smmel // Parse identifier. 291296936Smmel NamespcName = Tok.getIdentifierInfo(); 292296936Smmel IdentLoc = ConsumeToken(); 293296936Smmel 294296936Smmel // Parse (optional) attributes (most likely GNU strong-using extension). 295296936Smmel bool GNUAttr = false; 296296936Smmel if (Tok.is(tok::kw___attribute)) { 297296936Smmel GNUAttr = true; 298296936Smmel Attr = addAttributeLists(Attr, ParseGNUAttributes()); 299296936Smmel } 300296936Smmel 301296936Smmel // Eat ';'. 302296936Smmel DeclEnd = Tok.getLocation(); 303296936Smmel ExpectAndConsume(tok::semi, 304296936Smmel GNUAttr ? diag::err_expected_semi_after_attribute_list : 305296936Smmel diag::err_expected_semi_after_namespace_name, "", tok::semi); 306296936Smmel 307296936Smmel return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS, 308296936Smmel IdentLoc, NamespcName, Attr); 309296936Smmel} 310296936Smmel 311296936Smmel/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that 312296936Smmel/// 'using' was already seen. 313296936Smmel/// 314296936Smmel/// using-declaration: [C++ 7.3.p3: namespace.udecl] 315296936Smmel/// 'using' 'typename'[opt] ::[opt] nested-name-specifier 316296936Smmel/// unqualified-id 317296936Smmel/// 'using' :: unqualified-id 318296936Smmel/// 319296936SmmelParser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context, 320296936Smmel SourceLocation UsingLoc, 321296936Smmel SourceLocation &DeclEnd, 322296936Smmel AccessSpecifier AS) { 323296936Smmel CXXScopeSpec SS; 324296936Smmel SourceLocation TypenameLoc; 325296936Smmel bool IsTypeName; 326296936Smmel 327296936Smmel // Ignore optional 'typename'. 328296936Smmel // FIXME: This is wrong; we should parse this as a typename-specifier. 329296936Smmel if (Tok.is(tok::kw_typename)) { 330296936Smmel TypenameLoc = Tok.getLocation(); 331296936Smmel ConsumeToken(); 332296936Smmel IsTypeName = true; 333296936Smmel } 334296936Smmel else 335296936Smmel IsTypeName = false; 336296936Smmel 337296936Smmel // Parse nested-name-specifier. 338296936Smmel ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 339296936Smmel 340296936Smmel // Check nested-name specifier. 341296936Smmel if (SS.isInvalid()) { 342296936Smmel SkipUntil(tok::semi); 343296936Smmel return DeclPtrTy(); 344296936Smmel } 345296936Smmel 346296936Smmel // Parse the unqualified-id. We allow parsing of both constructor and 347296936Smmel // destructor names and allow the action module to diagnose any semantic 348296936Smmel // errors. 349296936Smmel UnqualifiedId Name; 350296936Smmel if (ParseUnqualifiedId(SS, 351296936Smmel /*EnteringContext=*/false, 352296936Smmel /*AllowDestructorName=*/true, 353296936Smmel /*AllowConstructorName=*/true, 354296936Smmel /*ObjectType=*/0, 355296936Smmel Name)) { 356296936Smmel SkipUntil(tok::semi); 357296936Smmel return DeclPtrTy(); 358296936Smmel } 359296936Smmel 360296936Smmel // Parse (optional) attributes (most likely GNU strong-using extension). 361296936Smmel llvm::OwningPtr<AttributeList> AttrList; 362296936Smmel if (Tok.is(tok::kw___attribute)) 363296936Smmel AttrList.reset(ParseGNUAttributes()); 364296936Smmel 365296936Smmel // Eat ';'. 366296936Smmel DeclEnd = Tok.getLocation(); 367296936Smmel ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 368296936Smmel AttrList ? "attributes list" : "using declaration", 369296936Smmel tok::semi); 370296936Smmel 371296936Smmel return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name, 372296936Smmel AttrList.get(), IsTypeName, TypenameLoc); 373296936Smmel} 374296936Smmel 375296936Smmel/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion. 376296936Smmel/// 377296936Smmel/// static_assert-declaration: 378296936Smmel/// static_assert ( constant-expression , string-literal ) ; 379296936Smmel/// 380296936SmmelParser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){ 381296936Smmel assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration"); 382296936Smmel SourceLocation StaticAssertLoc = ConsumeToken(); 383296936Smmel 384296936Smmel if (Tok.isNot(tok::l_paren)) { 385296936Smmel Diag(Tok, diag::err_expected_lparen); 386296936Smmel return DeclPtrTy(); 387296936Smmel } 388296936Smmel 389296936Smmel SourceLocation LParenLoc = ConsumeParen(); 390296936Smmel 391296936Smmel OwningExprResult AssertExpr(ParseConstantExpression()); 392296936Smmel if (AssertExpr.isInvalid()) { 393296936Smmel SkipUntil(tok::semi); 394296936Smmel return DeclPtrTy(); 395296936Smmel } 396296936Smmel 397296936Smmel if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi)) 398296936Smmel return DeclPtrTy(); 399296936Smmel 400296936Smmel if (Tok.isNot(tok::string_literal)) { 401296936Smmel Diag(Tok, diag::err_expected_string_literal); 402296936Smmel SkipUntil(tok::semi); 403296936Smmel return DeclPtrTy(); 404296936Smmel } 405296936Smmel 406296936Smmel OwningExprResult AssertMessage(ParseStringLiteralExpression()); 407296936Smmel if (AssertMessage.isInvalid()) 408296936Smmel return DeclPtrTy(); 409296936Smmel 410296936Smmel MatchRHSPunctuation(tok::r_paren, LParenLoc); 411296936Smmel 412296936Smmel DeclEnd = Tok.getLocation(); 413296936Smmel ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert); 414296936Smmel 415296936Smmel return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr), 416296936Smmel move(AssertMessage)); 417296936Smmel} 418296936Smmel 419296936Smmel/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier. 420296936Smmel/// 421296936Smmel/// 'decltype' ( expression ) 422296936Smmel/// 423296936Smmelvoid Parser::ParseDecltypeSpecifier(DeclSpec &DS) { 424296936Smmel assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier"); 425296936Smmel 426296936Smmel SourceLocation StartLoc = ConsumeToken(); 427296936Smmel SourceLocation LParenLoc = Tok.getLocation(); 428296936Smmel 429296936Smmel if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 430296936Smmel "decltype")) { 431296936Smmel SkipUntil(tok::r_paren); 432296936Smmel return; 433296936Smmel } 434296936Smmel 435296936Smmel // Parse the expression 436296936Smmel 437296936Smmel // C++0x [dcl.type.simple]p4: 438296936Smmel // The operand of the decltype specifier is an unevaluated operand. 439296936Smmel EnterExpressionEvaluationContext Unevaluated(Actions, 440296936Smmel Action::Unevaluated); 441296936Smmel OwningExprResult Result = ParseExpression(); 442296936Smmel if (Result.isInvalid()) { 443296936Smmel SkipUntil(tok::r_paren); 444296936Smmel return; 445296936Smmel } 446296936Smmel 447296936Smmel // Match the ')' 448296936Smmel SourceLocation RParenLoc; 449296936Smmel if (Tok.is(tok::r_paren)) 450296936Smmel RParenLoc = ConsumeParen(); 451296936Smmel else 452296936Smmel MatchRHSPunctuation(tok::r_paren, LParenLoc); 453296936Smmel 454296936Smmel if (RParenLoc.isInvalid()) 455296936Smmel return; 456296936Smmel 457296936Smmel const char *PrevSpec = 0; 458296936Smmel unsigned DiagID; 459296936Smmel // Check for duplicate type specifiers (e.g. "int decltype(a)"). 460296936Smmel if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec, 461296936Smmel DiagID, Result.release())) 462296936Smmel Diag(StartLoc, DiagID) << PrevSpec; 463296936Smmel} 464296936Smmel 465296936Smmel/// ParseClassName - Parse a C++ class-name, which names a class. Note 466296936Smmel/// that we only check that the result names a type; semantic analysis 467296936Smmel/// will need to verify that the type names a class. The result is 468296936Smmel/// either a type or NULL, depending on whether a type name was 469296936Smmel/// found. 470296936Smmel/// 471296936Smmel/// class-name: [C++ 9.1] 472296936Smmel/// identifier 473296936Smmel/// simple-template-id 474296936Smmel/// 475296936SmmelParser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation, 476296936Smmel CXXScopeSpec *SS) { 477296936Smmel // Check whether we have a template-id that names a type. 478296936Smmel if (Tok.is(tok::annot_template_id)) { 479296936Smmel TemplateIdAnnotation *TemplateId 480296936Smmel = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 481296936Smmel if (TemplateId->Kind == TNK_Type_template || 482296936Smmel TemplateId->Kind == TNK_Dependent_template_name) { 483296936Smmel AnnotateTemplateIdTokenAsType(SS); 484296936Smmel 485296936Smmel assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 486296936Smmel TypeTy *Type = Tok.getAnnotationValue(); 487296936Smmel EndLocation = Tok.getAnnotationEndLoc(); 488296936Smmel ConsumeToken(); 489296936Smmel 490296936Smmel if (Type) 491296936Smmel return Type; 492296936Smmel return true; 493296936Smmel } 494296936Smmel 495296936Smmel // Fall through to produce an error below. 496296936Smmel } 497296936Smmel 498296936Smmel if (Tok.isNot(tok::identifier)) { 499296936Smmel Diag(Tok, diag::err_expected_class_name); 500296936Smmel return true; 501296936Smmel } 502296936Smmel 503296936Smmel IdentifierInfo *Id = Tok.getIdentifierInfo(); 504296936Smmel SourceLocation IdLoc = ConsumeToken(); 505296936Smmel 506296936Smmel if (Tok.is(tok::less)) { 507296936Smmel // It looks the user intended to write a template-id here, but the 508296936Smmel // template-name was wrong. Try to fix that. 509296936Smmel TemplateNameKind TNK = TNK_Type_template; 510296936Smmel TemplateTy Template; 511296936Smmel if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, CurScope, 512296936Smmel SS, Template, TNK)) { 513296936Smmel Diag(IdLoc, diag::err_unknown_template_name) 514296936Smmel << Id; 515296936Smmel } 516296936Smmel 517296936Smmel if (!Template) 518296936Smmel return true; 519296936Smmel 520296936Smmel // Form the template name 521296936Smmel UnqualifiedId TemplateName; 522296936Smmel TemplateName.setIdentifier(Id, IdLoc); 523296936Smmel 524296936Smmel // Parse the full template-id, then turn it into a type. 525296936Smmel if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 526296936Smmel SourceLocation(), true)) 527296936Smmel return true; 528296936Smmel if (TNK == TNK_Dependent_template_name) 529296936Smmel AnnotateTemplateIdTokenAsType(SS); 530296936Smmel 531296936Smmel // If we didn't end up with a typename token, there's nothing more we 532296936Smmel // can do. 533296936Smmel if (Tok.isNot(tok::annot_typename)) 534296936Smmel return true; 535296936Smmel 536296936Smmel // Retrieve the type from the annotation token, consume that token, and 537296936Smmel // return. 538296936Smmel EndLocation = Tok.getAnnotationEndLoc(); 539296936Smmel TypeTy *Type = Tok.getAnnotationValue(); 540296936Smmel ConsumeToken(); 541296936Smmel return Type; 542296936Smmel } 543296936Smmel 544296936Smmel // We have an identifier; check whether it is actually a type. 545296936Smmel TypeTy *Type = Actions.getTypeName(*Id, IdLoc, CurScope, SS, true); 546296936Smmel if (!Type) { 547296936Smmel Diag(IdLoc, diag::err_expected_class_name); 548296936Smmel return true; 549296936Smmel } 550296936Smmel 551296936Smmel // Consume the identifier. 552296936Smmel EndLocation = IdLoc; 553296936Smmel return Type; 554296936Smmel} 555296936Smmel 556296936Smmel/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or 557296936Smmel/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which 558296936Smmel/// until we reach the start of a definition or see a token that 559296936Smmel/// cannot start a definition. If SuppressDeclarations is true, we do know. 560296936Smmel/// 561296936Smmel/// class-specifier: [C++ class] 562296936Smmel/// class-head '{' member-specification[opt] '}' 563296936Smmel/// class-head '{' member-specification[opt] '}' attributes[opt] 564296936Smmel/// class-head: 565296936Smmel/// class-key identifier[opt] base-clause[opt] 566296936Smmel/// class-key nested-name-specifier identifier base-clause[opt] 567296936Smmel/// class-key nested-name-specifier[opt] simple-template-id 568296936Smmel/// base-clause[opt] 569296936Smmel/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt] 570296936Smmel/// [GNU] class-key attributes[opt] nested-name-specifier 571296936Smmel/// identifier base-clause[opt] 572296936Smmel/// [GNU] class-key attributes[opt] nested-name-specifier[opt] 573296936Smmel/// simple-template-id base-clause[opt] 574296936Smmel/// class-key: 575296936Smmel/// 'class' 576296936Smmel/// 'struct' 577296936Smmel/// 'union' 578296936Smmel/// 579296936Smmel/// elaborated-type-specifier: [C++ dcl.type.elab] 580296936Smmel/// class-key ::[opt] nested-name-specifier[opt] identifier 581296936Smmel/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt] 582296936Smmel/// simple-template-id 583296936Smmel/// 584296936Smmel/// Note that the C++ class-specifier and elaborated-type-specifier, 585296936Smmel/// together, subsume the C99 struct-or-union-specifier: 586296936Smmel/// 587296936Smmel/// struct-or-union-specifier: [C99 6.7.2.1] 588296936Smmel/// struct-or-union identifier[opt] '{' struct-contents '}' 589296936Smmel/// struct-or-union identifier 590296936Smmel/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents 591296936Smmel/// '}' attributes[opt] 592296936Smmel/// [GNU] struct-or-union attributes[opt] identifier 593296936Smmel/// struct-or-union: 594296936Smmel/// 'struct' 595296936Smmel/// 'union' 596296936Smmelvoid Parser::ParseClassSpecifier(tok::TokenKind TagTokKind, 597296936Smmel SourceLocation StartLoc, DeclSpec &DS, 598296936Smmel const ParsedTemplateInfo &TemplateInfo, 599296936Smmel AccessSpecifier AS, bool SuppressDeclarations){ 600296936Smmel DeclSpec::TST TagType; 601296936Smmel if (TagTokKind == tok::kw_struct) 602296936Smmel TagType = DeclSpec::TST_struct; 603296936Smmel else if (TagTokKind == tok::kw_class) 604296936Smmel TagType = DeclSpec::TST_class; 605296936Smmel else { 606296936Smmel assert(TagTokKind == tok::kw_union && "Not a class specifier"); 607296936Smmel TagType = DeclSpec::TST_union; 608296936Smmel } 609296936Smmel 610296936Smmel if (Tok.is(tok::code_completion)) { 611296936Smmel // Code completion for a struct, class, or union name. 612296936Smmel Actions.CodeCompleteTag(CurScope, TagType); 613296936Smmel ConsumeCodeCompletionToken(); 614296936Smmel } 615296936Smmel 616296936Smmel AttributeList *AttrList = 0; 617296936Smmel // If attributes exist after tag, parse them. 618296936Smmel if (Tok.is(tok::kw___attribute)) 619296936Smmel AttrList = ParseGNUAttributes(); 620296936Smmel 621296936Smmel // If declspecs exist after tag, parse them. 622296936Smmel if (Tok.is(tok::kw___declspec)) 623296936Smmel AttrList = ParseMicrosoftDeclSpec(AttrList); 624296936Smmel 625296936Smmel // If C++0x attributes exist here, parse them. 626296936Smmel // FIXME: Are we consistent with the ordering of parsing of different 627296936Smmel // styles of attributes? 628296936Smmel if (isCXX0XAttributeSpecifier()) 629296936Smmel AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList); 630296936Smmel 631296936Smmel if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) { 632296936Smmel // GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but 633296936Smmel // __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the 634296936Smmel // token sequence "struct __is_pod", make __is_pod into a normal 635296936Smmel // identifier rather than a keyword, to allow libstdc++ 4.2 to work 636296936Smmel // properly. 637296936Smmel Tok.getIdentifierInfo()->setTokenID(tok::identifier); 638296936Smmel Tok.setKind(tok::identifier); 639296936Smmel } 640296936Smmel 641296936Smmel if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) { 642296936Smmel // GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but 643296936Smmel // __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the 644296936Smmel // token sequence "struct __is_empty", make __is_empty into a normal 645296936Smmel // identifier rather than a keyword, to allow libstdc++ 4.2 to work 646296936Smmel // properly. 647296936Smmel Tok.getIdentifierInfo()->setTokenID(tok::identifier); 648296936Smmel Tok.setKind(tok::identifier); 649296936Smmel } 650296936Smmel 651296936Smmel // Parse the (optional) nested-name-specifier. 652296936Smmel CXXScopeSpec &SS = DS.getTypeSpecScope(); 653296936Smmel if (getLang().CPlusPlus) { 654296936Smmel // "FOO : BAR" is not a potential typo for "FOO::BAR". 655296936Smmel ColonProtectionRAIIObject X(*this); 656296936Smmel 657296936Smmel ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true); 658296936Smmel if (SS.isSet()) 659296936Smmel if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id)) 660296936Smmel Diag(Tok, diag::err_expected_ident); 661296936Smmel } 662296936Smmel 663296936Smmel TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams; 664296936Smmel 665296936Smmel // Parse the (optional) class name or simple-template-id. 666296936Smmel IdentifierInfo *Name = 0; 667296936Smmel SourceLocation NameLoc; 668296936Smmel TemplateIdAnnotation *TemplateId = 0; 669296936Smmel if (Tok.is(tok::identifier)) { 670296936Smmel Name = Tok.getIdentifierInfo(); 671296936Smmel NameLoc = ConsumeToken(); 672296936Smmel 673296936Smmel if (Tok.is(tok::less)) { 674296936Smmel // The name was supposed to refer to a template, but didn't. 675296936Smmel // Eat the template argument list and try to continue parsing this as 676296936Smmel // a class (or template thereof). 677296936Smmel TemplateArgList TemplateArgs; 678296936Smmel SourceLocation LAngleLoc, RAngleLoc; 679296936Smmel if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS, 680296936Smmel true, LAngleLoc, 681296936Smmel TemplateArgs, RAngleLoc)) { 682296936Smmel // We couldn't parse the template argument list at all, so don't 683296936Smmel // try to give any location information for the list. 684296936Smmel LAngleLoc = RAngleLoc = SourceLocation(); 685296936Smmel } 686296936Smmel 687296936Smmel Diag(NameLoc, diag::err_explicit_spec_non_template) 688296936Smmel << (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 689296936Smmel << (TagType == DeclSpec::TST_class? 0 690296936Smmel : TagType == DeclSpec::TST_struct? 1 691296936Smmel : 2) 692296936Smmel << Name 693296936Smmel << SourceRange(LAngleLoc, RAngleLoc); 694296936Smmel 695296936Smmel // Strip off the last template parameter list if it was empty, since 696296936Smmel // we've removed its template argument list. 697 if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) { 698 if (TemplateParams && TemplateParams->size() > 1) { 699 TemplateParams->pop_back(); 700 } else { 701 TemplateParams = 0; 702 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 703 = ParsedTemplateInfo::NonTemplate; 704 } 705 } else if (TemplateInfo.Kind 706 == ParsedTemplateInfo::ExplicitInstantiation) { 707 // Pretend this is just a forward declaration. 708 TemplateParams = 0; 709 const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind 710 = ParsedTemplateInfo::NonTemplate; 711 const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc 712 = SourceLocation(); 713 const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc 714 = SourceLocation(); 715 } 716 717 718 } 719 } else if (Tok.is(tok::annot_template_id)) { 720 TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 721 NameLoc = ConsumeToken(); 722 723 if (TemplateId->Kind != TNK_Type_template) { 724 // The template-name in the simple-template-id refers to 725 // something other than a class template. Give an appropriate 726 // error message and skip to the ';'. 727 SourceRange Range(NameLoc); 728 if (SS.isNotEmpty()) 729 Range.setBegin(SS.getBeginLoc()); 730 731 Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template) 732 << Name << static_cast<int>(TemplateId->Kind) << Range; 733 734 DS.SetTypeSpecError(); 735 SkipUntil(tok::semi, false, true); 736 TemplateId->Destroy(); 737 return; 738 } 739 } 740 741 // There are four options here. If we have 'struct foo;', then this 742 // is either a forward declaration or a friend declaration, which 743 // have to be treated differently. If we have 'struct foo {...' or 744 // 'struct foo :...' then this is a definition. Otherwise we have 745 // something like 'struct foo xyz', a reference. 746 // However, in some contexts, things look like declarations but are just 747 // references, e.g. 748 // new struct s; 749 // or 750 // &T::operator struct s; 751 // For these, SuppressDeclarations is true. 752 Action::TagUseKind TUK; 753 if (SuppressDeclarations) 754 TUK = Action::TUK_Reference; 755 else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){ 756 if (DS.isFriendSpecified()) { 757 // C++ [class.friend]p2: 758 // A class shall not be defined in a friend declaration. 759 Diag(Tok.getLocation(), diag::err_friend_decl_defines_class) 760 << SourceRange(DS.getFriendSpecLoc()); 761 762 // Skip everything up to the semicolon, so that this looks like a proper 763 // friend class (or template thereof) declaration. 764 SkipUntil(tok::semi, true, true); 765 TUK = Action::TUK_Friend; 766 } else { 767 // Okay, this is a class definition. 768 TUK = Action::TUK_Definition; 769 } 770 } else if (Tok.is(tok::semi)) 771 TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration; 772 else 773 TUK = Action::TUK_Reference; 774 775 if (!Name && !TemplateId && TUK != Action::TUK_Definition) { 776 // We have a declaration or reference to an anonymous class. 777 Diag(StartLoc, diag::err_anon_type_definition) 778 << DeclSpec::getSpecifierName(TagType); 779 780 SkipUntil(tok::comma, true); 781 782 if (TemplateId) 783 TemplateId->Destroy(); 784 return; 785 } 786 787 // Create the tag portion of the class or class template. 788 Action::DeclResult TagOrTempResult = true; // invalid 789 Action::TypeResult TypeResult = true; // invalid 790 791 bool Owned = false; 792 if (TemplateId) { 793 // Explicit specialization, class template partial specialization, 794 // or explicit instantiation. 795 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 796 TemplateId->getTemplateArgs(), 797 TemplateId->NumArgs); 798 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 799 TUK == Action::TUK_Declaration) { 800 // This is an explicit instantiation of a class template. 801 TagOrTempResult 802 = Actions.ActOnExplicitInstantiation(CurScope, 803 TemplateInfo.ExternLoc, 804 TemplateInfo.TemplateLoc, 805 TagType, 806 StartLoc, 807 SS, 808 TemplateTy::make(TemplateId->Template), 809 TemplateId->TemplateNameLoc, 810 TemplateId->LAngleLoc, 811 TemplateArgsPtr, 812 TemplateId->RAngleLoc, 813 AttrList); 814 815 // Friend template-ids are treated as references unless 816 // they have template headers, in which case they're ill-formed 817 // (FIXME: "template <class T> friend class A<T>::B<int>;"). 818 // We diagnose this error in ActOnClassTemplateSpecialization. 819 } else if (TUK == Action::TUK_Reference || 820 (TUK == Action::TUK_Friend && 821 TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) { 822 TypeResult 823 = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template), 824 TemplateId->TemplateNameLoc, 825 TemplateId->LAngleLoc, 826 TemplateArgsPtr, 827 TemplateId->RAngleLoc); 828 829 TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK, 830 TagType, StartLoc); 831 } else { 832 // This is an explicit specialization or a class template 833 // partial specialization. 834 TemplateParameterLists FakedParamLists; 835 836 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 837 // This looks like an explicit instantiation, because we have 838 // something like 839 // 840 // template class Foo<X> 841 // 842 // but it actually has a definition. Most likely, this was 843 // meant to be an explicit specialization, but the user forgot 844 // the '<>' after 'template'. 845 assert(TUK == Action::TUK_Definition && "Expected a definition here"); 846 847 SourceLocation LAngleLoc 848 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 849 Diag(TemplateId->TemplateNameLoc, 850 diag::err_explicit_instantiation_with_definition) 851 << SourceRange(TemplateInfo.TemplateLoc) 852 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 853 854 // Create a fake template parameter list that contains only 855 // "template<>", so that we treat this construct as a class 856 // template specialization. 857 FakedParamLists.push_back( 858 Actions.ActOnTemplateParameterList(0, SourceLocation(), 859 TemplateInfo.TemplateLoc, 860 LAngleLoc, 861 0, 0, 862 LAngleLoc)); 863 TemplateParams = &FakedParamLists; 864 } 865 866 // Build the class template specialization. 867 TagOrTempResult 868 = Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK, 869 StartLoc, SS, 870 TemplateTy::make(TemplateId->Template), 871 TemplateId->TemplateNameLoc, 872 TemplateId->LAngleLoc, 873 TemplateArgsPtr, 874 TemplateId->RAngleLoc, 875 AttrList, 876 Action::MultiTemplateParamsArg(Actions, 877 TemplateParams? &(*TemplateParams)[0] : 0, 878 TemplateParams? TemplateParams->size() : 0)); 879 } 880 TemplateId->Destroy(); 881 } else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 882 TUK == Action::TUK_Declaration) { 883 // Explicit instantiation of a member of a class template 884 // specialization, e.g., 885 // 886 // template struct Outer<int>::Inner; 887 // 888 TagOrTempResult 889 = Actions.ActOnExplicitInstantiation(CurScope, 890 TemplateInfo.ExternLoc, 891 TemplateInfo.TemplateLoc, 892 TagType, StartLoc, SS, Name, 893 NameLoc, AttrList); 894 } else { 895 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation && 896 TUK == Action::TUK_Definition) { 897 // FIXME: Diagnose this particular error. 898 } 899 900 bool IsDependent = false; 901 902 // Declaration or definition of a class type 903 TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS, 904 Name, NameLoc, AttrList, AS, 905 Action::MultiTemplateParamsArg(Actions, 906 TemplateParams? &(*TemplateParams)[0] : 0, 907 TemplateParams? TemplateParams->size() : 0), 908 Owned, IsDependent); 909 910 // If ActOnTag said the type was dependent, try again with the 911 // less common call. 912 if (IsDependent) 913 TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK, 914 SS, Name, StartLoc, NameLoc); 915 } 916 917 // If there is a body, parse it and inform the actions module. 918 if (TUK == Action::TUK_Definition) { 919 assert(Tok.is(tok::l_brace) || 920 (getLang().CPlusPlus && Tok.is(tok::colon))); 921 if (getLang().CPlusPlus) 922 ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get()); 923 else 924 ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get()); 925 } 926 927 void *Result; 928 if (!TypeResult.isInvalid()) { 929 TagType = DeclSpec::TST_typename; 930 Result = TypeResult.get(); 931 Owned = false; 932 } else if (!TagOrTempResult.isInvalid()) { 933 Result = TagOrTempResult.get().getAs<void>(); 934 } else { 935 DS.SetTypeSpecError(); 936 return; 937 } 938 939 const char *PrevSpec = 0; 940 unsigned DiagID; 941 942 // FIXME: The DeclSpec should keep the locations of both the keyword and the 943 // name (if there is one). 944 SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc; 945 946 if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID, 947 Result, Owned)) 948 Diag(StartLoc, DiagID) << PrevSpec; 949 950 // At this point, we've successfully parsed a class-specifier in 'definition' 951 // form (e.g. "struct foo { int x; }". While we could just return here, we're 952 // going to look at what comes after it to improve error recovery. If an 953 // impossible token occurs next, we assume that the programmer forgot a ; at 954 // the end of the declaration and recover that way. 955 // 956 // This switch enumerates the valid "follow" set for definition. 957 if (TUK == Action::TUK_Definition) { 958 bool ExpectedSemi = true; 959 switch (Tok.getKind()) { 960 default: break; 961 case tok::semi: // struct foo {...} ; 962 case tok::star: // struct foo {...} * P; 963 case tok::amp: // struct foo {...} & R = ... 964 case tok::identifier: // struct foo {...} V ; 965 case tok::r_paren: //(struct foo {...} ) {4} 966 case tok::annot_cxxscope: // struct foo {...} a:: b; 967 case tok::annot_typename: // struct foo {...} a ::b; 968 case tok::annot_template_id: // struct foo {...} a<int> ::b; 969 case tok::l_paren: // struct foo {...} ( x); 970 case tok::comma: // __builtin_offsetof(struct foo{...} , 971 ExpectedSemi = false; 972 break; 973 // Type qualifiers 974 case tok::kw_const: // struct foo {...} const x; 975 case tok::kw_volatile: // struct foo {...} volatile x; 976 case tok::kw_restrict: // struct foo {...} restrict x; 977 case tok::kw_inline: // struct foo {...} inline foo() {}; 978 // Storage-class specifiers 979 case tok::kw_static: // struct foo {...} static x; 980 case tok::kw_extern: // struct foo {...} extern x; 981 case tok::kw_typedef: // struct foo {...} typedef x; 982 case tok::kw_register: // struct foo {...} register x; 983 case tok::kw_auto: // struct foo {...} auto x; 984 case tok::kw_mutable: // struct foo {...} mutable x; 985 // As shown above, type qualifiers and storage class specifiers absolutely 986 // can occur after class specifiers according to the grammar. However, 987 // almost noone actually writes code like this. If we see one of these, 988 // it is much more likely that someone missed a semi colon and the 989 // type/storage class specifier we're seeing is part of the *next* 990 // intended declaration, as in: 991 // 992 // struct foo { ... } 993 // typedef int X; 994 // 995 // We'd really like to emit a missing semicolon error instead of emitting 996 // an error on the 'int' saying that you can't have two type specifiers in 997 // the same declaration of X. Because of this, we look ahead past this 998 // token to see if it's a type specifier. If so, we know the code is 999 // otherwise invalid, so we can produce the expected semi error. 1000 if (!isKnownToBeTypeSpecifier(NextToken())) 1001 ExpectedSemi = false; 1002 break; 1003 1004 case tok::r_brace: // struct bar { struct foo {...} } 1005 // Missing ';' at end of struct is accepted as an extension in C mode. 1006 if (!getLang().CPlusPlus) 1007 ExpectedSemi = false; 1008 break; 1009 } 1010 1011 if (ExpectedSemi) { 1012 ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl, 1013 TagType == DeclSpec::TST_class ? "class" 1014 : TagType == DeclSpec::TST_struct? "struct" : "union"); 1015 // Push this token back into the preprocessor and change our current token 1016 // to ';' so that the rest of the code recovers as though there were an 1017 // ';' after the definition. 1018 PP.EnterToken(Tok); 1019 Tok.setKind(tok::semi); 1020 } 1021 } 1022} 1023 1024/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived]. 1025/// 1026/// base-clause : [C++ class.derived] 1027/// ':' base-specifier-list 1028/// base-specifier-list: 1029/// base-specifier '...'[opt] 1030/// base-specifier-list ',' base-specifier '...'[opt] 1031void Parser::ParseBaseClause(DeclPtrTy ClassDecl) { 1032 assert(Tok.is(tok::colon) && "Not a base clause"); 1033 ConsumeToken(); 1034 1035 // Build up an array of parsed base specifiers. 1036 llvm::SmallVector<BaseTy *, 8> BaseInfo; 1037 1038 while (true) { 1039 // Parse a base-specifier. 1040 BaseResult Result = ParseBaseSpecifier(ClassDecl); 1041 if (Result.isInvalid()) { 1042 // Skip the rest of this base specifier, up until the comma or 1043 // opening brace. 1044 SkipUntil(tok::comma, tok::l_brace, true, true); 1045 } else { 1046 // Add this to our array of base specifiers. 1047 BaseInfo.push_back(Result.get()); 1048 } 1049 1050 // If the next token is a comma, consume it and keep reading 1051 // base-specifiers. 1052 if (Tok.isNot(tok::comma)) break; 1053 1054 // Consume the comma. 1055 ConsumeToken(); 1056 } 1057 1058 // Attach the base specifiers 1059 Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size()); 1060} 1061 1062/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is 1063/// one entry in the base class list of a class specifier, for example: 1064/// class foo : public bar, virtual private baz { 1065/// 'public bar' and 'virtual private baz' are each base-specifiers. 1066/// 1067/// base-specifier: [C++ class.derived] 1068/// ::[opt] nested-name-specifier[opt] class-name 1069/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt] 1070/// class-name 1071/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt] 1072/// class-name 1073Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) { 1074 bool IsVirtual = false; 1075 SourceLocation StartLoc = Tok.getLocation(); 1076 1077 // Parse the 'virtual' keyword. 1078 if (Tok.is(tok::kw_virtual)) { 1079 ConsumeToken(); 1080 IsVirtual = true; 1081 } 1082 1083 // Parse an (optional) access specifier. 1084 AccessSpecifier Access = getAccessSpecifierIfPresent(); 1085 if (Access != AS_none) 1086 ConsumeToken(); 1087 1088 // Parse the 'virtual' keyword (again!), in case it came after the 1089 // access specifier. 1090 if (Tok.is(tok::kw_virtual)) { 1091 SourceLocation VirtualLoc = ConsumeToken(); 1092 if (IsVirtual) { 1093 // Complain about duplicate 'virtual' 1094 Diag(VirtualLoc, diag::err_dup_virtual) 1095 << FixItHint::CreateRemoval(VirtualLoc); 1096 } 1097 1098 IsVirtual = true; 1099 } 1100 1101 // Parse optional '::' and optional nested-name-specifier. 1102 CXXScopeSpec SS; 1103 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, 1104 /*EnteringContext=*/false); 1105 1106 // The location of the base class itself. 1107 SourceLocation BaseLoc = Tok.getLocation(); 1108 1109 // Parse the class-name. 1110 SourceLocation EndLocation; 1111 TypeResult BaseType = ParseClassName(EndLocation, &SS); 1112 if (BaseType.isInvalid()) 1113 return true; 1114 1115 // Find the complete source range for the base-specifier. 1116 SourceRange Range(StartLoc, EndLocation); 1117 1118 // Notify semantic analysis that we have parsed a complete 1119 // base-specifier. 1120 return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access, 1121 BaseType.get(), BaseLoc); 1122} 1123 1124/// getAccessSpecifierIfPresent - Determine whether the next token is 1125/// a C++ access-specifier. 1126/// 1127/// access-specifier: [C++ class.derived] 1128/// 'private' 1129/// 'protected' 1130/// 'public' 1131AccessSpecifier Parser::getAccessSpecifierIfPresent() const { 1132 switch (Tok.getKind()) { 1133 default: return AS_none; 1134 case tok::kw_private: return AS_private; 1135 case tok::kw_protected: return AS_protected; 1136 case tok::kw_public: return AS_public; 1137 } 1138} 1139 1140void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo, 1141 DeclPtrTy ThisDecl) { 1142 // We just declared a member function. If this member function 1143 // has any default arguments, we'll need to parse them later. 1144 LateParsedMethodDeclaration *LateMethod = 0; 1145 DeclaratorChunk::FunctionTypeInfo &FTI 1146 = DeclaratorInfo.getTypeObject(0).Fun; 1147 for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) { 1148 if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) { 1149 if (!LateMethod) { 1150 // Push this method onto the stack of late-parsed method 1151 // declarations. 1152 getCurrentClass().MethodDecls.push_back( 1153 LateParsedMethodDeclaration(ThisDecl)); 1154 LateMethod = &getCurrentClass().MethodDecls.back(); 1155 LateMethod->TemplateScope = CurScope->isTemplateParamScope(); 1156 1157 // Add all of the parameters prior to this one (they don't 1158 // have default arguments). 1159 LateMethod->DefaultArgs.reserve(FTI.NumArgs); 1160 for (unsigned I = 0; I < ParamIdx; ++I) 1161 LateMethod->DefaultArgs.push_back( 1162 LateParsedDefaultArgument(FTI.ArgInfo[I].Param)); 1163 } 1164 1165 // Add this parameter to the list of parameters (it or may 1166 // not have a default argument). 1167 LateMethod->DefaultArgs.push_back( 1168 LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param, 1169 FTI.ArgInfo[ParamIdx].DefaultArgTokens)); 1170 } 1171 } 1172} 1173 1174/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration. 1175/// 1176/// member-declaration: 1177/// decl-specifier-seq[opt] member-declarator-list[opt] ';' 1178/// function-definition ';'[opt] 1179/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO] 1180/// using-declaration [TODO] 1181/// [C++0x] static_assert-declaration 1182/// template-declaration 1183/// [GNU] '__extension__' member-declaration 1184/// 1185/// member-declarator-list: 1186/// member-declarator 1187/// member-declarator-list ',' member-declarator 1188/// 1189/// member-declarator: 1190/// declarator pure-specifier[opt] 1191/// declarator constant-initializer[opt] 1192/// identifier[opt] ':' constant-expression 1193/// 1194/// pure-specifier: 1195/// '= 0' 1196/// 1197/// constant-initializer: 1198/// '=' constant-expression 1199/// 1200void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS, 1201 const ParsedTemplateInfo &TemplateInfo) { 1202 // Access declarations. 1203 if (!TemplateInfo.Kind && 1204 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1205 !TryAnnotateCXXScopeToken() && 1206 Tok.is(tok::annot_cxxscope)) { 1207 bool isAccessDecl = false; 1208 if (NextToken().is(tok::identifier)) 1209 isAccessDecl = GetLookAheadToken(2).is(tok::semi); 1210 else 1211 isAccessDecl = NextToken().is(tok::kw_operator); 1212 1213 if (isAccessDecl) { 1214 // Collect the scope specifier token we annotated earlier. 1215 CXXScopeSpec SS; 1216 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false); 1217 1218 // Try to parse an unqualified-id. 1219 UnqualifiedId Name; 1220 if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) { 1221 SkipUntil(tok::semi); 1222 return; 1223 } 1224 1225 // TODO: recover from mistakenly-qualified operator declarations. 1226 if (ExpectAndConsume(tok::semi, 1227 diag::err_expected_semi_after, 1228 "access declaration", 1229 tok::semi)) 1230 return; 1231 1232 Actions.ActOnUsingDeclaration(CurScope, AS, 1233 false, SourceLocation(), 1234 SS, Name, 1235 /* AttrList */ 0, 1236 /* IsTypeName */ false, 1237 SourceLocation()); 1238 return; 1239 } 1240 } 1241 1242 // static_assert-declaration 1243 if (Tok.is(tok::kw_static_assert)) { 1244 // FIXME: Check for templates 1245 SourceLocation DeclEnd; 1246 ParseStaticAssertDeclaration(DeclEnd); 1247 return; 1248 } 1249 1250 if (Tok.is(tok::kw_template)) { 1251 assert(!TemplateInfo.TemplateParams && 1252 "Nested template improperly parsed?"); 1253 SourceLocation DeclEnd; 1254 ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd, 1255 AS); 1256 return; 1257 } 1258 1259 // Handle: member-declaration ::= '__extension__' member-declaration 1260 if (Tok.is(tok::kw___extension__)) { 1261 // __extension__ silences extension warnings in the subexpression. 1262 ExtensionRAIIObject O(Diags); // Use RAII to do this. 1263 ConsumeToken(); 1264 return ParseCXXClassMemberDeclaration(AS, TemplateInfo); 1265 } 1266 1267 // Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it 1268 // is a bitfield. 1269 ColonProtectionRAIIObject X(*this); 1270 1271 CXX0XAttributeList AttrList; 1272 // Optional C++0x attribute-specifier 1273 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) 1274 AttrList = ParseCXX0XAttributes(); 1275 1276 if (Tok.is(tok::kw_using)) { 1277 // FIXME: Check for template aliases 1278 1279 if (AttrList.HasAttr) 1280 Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed) 1281 << AttrList.Range; 1282 1283 // Eat 'using'. 1284 SourceLocation UsingLoc = ConsumeToken(); 1285 1286 if (Tok.is(tok::kw_namespace)) { 1287 Diag(UsingLoc, diag::err_using_namespace_in_class); 1288 SkipUntil(tok::semi, true, true); 1289 } else { 1290 SourceLocation DeclEnd; 1291 // Otherwise, it must be using-declaration. 1292 ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS); 1293 } 1294 return; 1295 } 1296 1297 SourceLocation DSStart = Tok.getLocation(); 1298 // decl-specifier-seq: 1299 // Parse the common declaration-specifiers piece. 1300 ParsingDeclSpec DS(*this); 1301 DS.AddAttributes(AttrList.AttrList); 1302 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class); 1303 1304 Action::MultiTemplateParamsArg TemplateParams(Actions, 1305 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0, 1306 TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0); 1307 1308 if (Tok.is(tok::semi)) { 1309 ConsumeToken(); 1310 Actions.ParsedFreeStandingDeclSpec(CurScope, AS, DS); 1311 return; 1312 } 1313 1314 ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext); 1315 1316 if (Tok.isNot(tok::colon)) { 1317 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 1318 ColonProtectionRAIIObject X(*this); 1319 1320 // Parse the first declarator. 1321 ParseDeclarator(DeclaratorInfo); 1322 // Error parsing the declarator? 1323 if (!DeclaratorInfo.hasName()) { 1324 // If so, skip until the semi-colon or a }. 1325 SkipUntil(tok::r_brace, true); 1326 if (Tok.is(tok::semi)) 1327 ConsumeToken(); 1328 return; 1329 } 1330 1331 // If attributes exist after the declarator, but before an '{', parse them. 1332 if (Tok.is(tok::kw___attribute)) { 1333 SourceLocation Loc; 1334 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1335 DeclaratorInfo.AddAttributes(AttrList, Loc); 1336 } 1337 1338 // function-definition: 1339 if (Tok.is(tok::l_brace) 1340 || (DeclaratorInfo.isFunctionDeclarator() && 1341 (Tok.is(tok::colon) || Tok.is(tok::kw_try)))) { 1342 if (!DeclaratorInfo.isFunctionDeclarator()) { 1343 Diag(Tok, diag::err_func_def_no_params); 1344 ConsumeBrace(); 1345 SkipUntil(tok::r_brace, true); 1346 return; 1347 } 1348 1349 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1350 Diag(Tok, diag::err_function_declared_typedef); 1351 // This recovery skips the entire function body. It would be nice 1352 // to simply call ParseCXXInlineMethodDef() below, however Sema 1353 // assumes the declarator represents a function, not a typedef. 1354 ConsumeBrace(); 1355 SkipUntil(tok::r_brace, true); 1356 return; 1357 } 1358 1359 ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo); 1360 return; 1361 } 1362 } 1363 1364 // member-declarator-list: 1365 // member-declarator 1366 // member-declarator-list ',' member-declarator 1367 1368 llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup; 1369 OwningExprResult BitfieldSize(Actions); 1370 OwningExprResult Init(Actions); 1371 bool Deleted = false; 1372 1373 while (1) { 1374 // member-declarator: 1375 // declarator pure-specifier[opt] 1376 // declarator constant-initializer[opt] 1377 // identifier[opt] ':' constant-expression 1378 1379 if (Tok.is(tok::colon)) { 1380 ConsumeToken(); 1381 BitfieldSize = ParseConstantExpression(); 1382 if (BitfieldSize.isInvalid()) 1383 SkipUntil(tok::comma, true, true); 1384 } 1385 1386 // pure-specifier: 1387 // '= 0' 1388 // 1389 // constant-initializer: 1390 // '=' constant-expression 1391 // 1392 // defaulted/deleted function-definition: 1393 // '=' 'default' [TODO] 1394 // '=' 'delete' 1395 1396 if (Tok.is(tok::equal)) { 1397 ConsumeToken(); 1398 if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) { 1399 ConsumeToken(); 1400 Deleted = true; 1401 } else { 1402 Init = ParseInitializer(); 1403 if (Init.isInvalid()) 1404 SkipUntil(tok::comma, true, true); 1405 } 1406 } 1407 1408 // If attributes exist after the declarator, parse them. 1409 if (Tok.is(tok::kw___attribute)) { 1410 SourceLocation Loc; 1411 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1412 DeclaratorInfo.AddAttributes(AttrList, Loc); 1413 } 1414 1415 // NOTE: If Sema is the Action module and declarator is an instance field, 1416 // this call will *not* return the created decl; It will return null. 1417 // See Sema::ActOnCXXMemberDeclarator for details. 1418 1419 DeclPtrTy ThisDecl; 1420 if (DS.isFriendSpecified()) { 1421 // TODO: handle initializers, bitfields, 'delete' 1422 ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo, 1423 /*IsDefinition*/ false, 1424 move(TemplateParams)); 1425 } else { 1426 ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS, 1427 DeclaratorInfo, 1428 move(TemplateParams), 1429 BitfieldSize.release(), 1430 Init.release(), 1431 /*IsDefinition*/Deleted, 1432 Deleted); 1433 } 1434 if (ThisDecl) 1435 DeclsInGroup.push_back(ThisDecl); 1436 1437 if (DeclaratorInfo.isFunctionDeclarator() && 1438 DeclaratorInfo.getDeclSpec().getStorageClassSpec() 1439 != DeclSpec::SCS_typedef) { 1440 HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl); 1441 } 1442 1443 DeclaratorInfo.complete(ThisDecl); 1444 1445 // If we don't have a comma, it is either the end of the list (a ';') 1446 // or an error, bail out. 1447 if (Tok.isNot(tok::comma)) 1448 break; 1449 1450 // Consume the comma. 1451 ConsumeToken(); 1452 1453 // Parse the next declarator. 1454 DeclaratorInfo.clear(); 1455 BitfieldSize = 0; 1456 Init = 0; 1457 Deleted = false; 1458 1459 // Attributes are only allowed on the second declarator. 1460 if (Tok.is(tok::kw___attribute)) { 1461 SourceLocation Loc; 1462 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1463 DeclaratorInfo.AddAttributes(AttrList, Loc); 1464 } 1465 1466 if (Tok.isNot(tok::colon)) 1467 ParseDeclarator(DeclaratorInfo); 1468 } 1469 1470 if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) { 1471 // Skip to end of block or statement. 1472 SkipUntil(tok::r_brace, true, true); 1473 // If we stopped at a ';', eat it. 1474 if (Tok.is(tok::semi)) ConsumeToken(); 1475 return; 1476 } 1477 1478 Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(), 1479 DeclsInGroup.size()); 1480} 1481 1482/// ParseCXXMemberSpecification - Parse the class definition. 1483/// 1484/// member-specification: 1485/// member-declaration member-specification[opt] 1486/// access-specifier ':' member-specification[opt] 1487/// 1488void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc, 1489 unsigned TagType, DeclPtrTy TagDecl) { 1490 assert((TagType == DeclSpec::TST_struct || 1491 TagType == DeclSpec::TST_union || 1492 TagType == DeclSpec::TST_class) && "Invalid TagType!"); 1493 1494 PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions, 1495 PP.getSourceManager(), 1496 "parsing struct/union/class body"); 1497 1498 // Determine whether this is a non-nested class. Note that local 1499 // classes are *not* considered to be nested classes. 1500 bool NonNestedClass = true; 1501 if (!ClassStack.empty()) { 1502 for (const Scope *S = CurScope; S; S = S->getParent()) { 1503 if (S->isClassScope()) { 1504 // We're inside a class scope, so this is a nested class. 1505 NonNestedClass = false; 1506 break; 1507 } 1508 1509 if ((S->getFlags() & Scope::FnScope)) { 1510 // If we're in a function or function template declared in the 1511 // body of a class, then this is a local class rather than a 1512 // nested class. 1513 const Scope *Parent = S->getParent(); 1514 if (Parent->isTemplateParamScope()) 1515 Parent = Parent->getParent(); 1516 if (Parent->isClassScope()) 1517 break; 1518 } 1519 } 1520 } 1521 1522 // Enter a scope for the class. 1523 ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope); 1524 1525 // Note that we are parsing a new (potentially-nested) class definition. 1526 ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass); 1527 1528 if (TagDecl) 1529 Actions.ActOnTagStartDefinition(CurScope, TagDecl); 1530 1531 if (Tok.is(tok::colon)) { 1532 ParseBaseClause(TagDecl); 1533 1534 if (!Tok.is(tok::l_brace)) { 1535 Diag(Tok, diag::err_expected_lbrace_after_base_specifiers); 1536 1537 if (TagDecl) 1538 Actions.ActOnTagDefinitionError(CurScope, TagDecl); 1539 return; 1540 } 1541 } 1542 1543 assert(Tok.is(tok::l_brace)); 1544 1545 SourceLocation LBraceLoc = ConsumeBrace(); 1546 1547 if (!TagDecl) { 1548 SkipUntil(tok::r_brace, false, false); 1549 return; 1550 } 1551 1552 Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc); 1553 1554 // C++ 11p3: Members of a class defined with the keyword class are private 1555 // by default. Members of a class defined with the keywords struct or union 1556 // are public by default. 1557 AccessSpecifier CurAS; 1558 if (TagType == DeclSpec::TST_class) 1559 CurAS = AS_private; 1560 else 1561 CurAS = AS_public; 1562 1563 // While we still have something to read, read the member-declarations. 1564 while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { 1565 // Each iteration of this loop reads one member-declaration. 1566 1567 // Check for extraneous top-level semicolon. 1568 if (Tok.is(tok::semi)) { 1569 Diag(Tok, diag::ext_extra_struct_semi) 1570 << FixItHint::CreateRemoval(Tok.getLocation()); 1571 ConsumeToken(); 1572 continue; 1573 } 1574 1575 AccessSpecifier AS = getAccessSpecifierIfPresent(); 1576 if (AS != AS_none) { 1577 // Current token is a C++ access specifier. 1578 CurAS = AS; 1579 ConsumeToken(); 1580 ExpectAndConsume(tok::colon, diag::err_expected_colon); 1581 continue; 1582 } 1583 1584 // FIXME: Make sure we don't have a template here. 1585 1586 // Parse all the comma separated declarators. 1587 ParseCXXClassMemberDeclaration(CurAS); 1588 } 1589 1590 SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); 1591 1592 // If attributes exist after class contents, parse them. 1593 llvm::OwningPtr<AttributeList> AttrList; 1594 if (Tok.is(tok::kw___attribute)) 1595 AttrList.reset(ParseGNUAttributes()); 1596 1597 Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl, 1598 LBraceLoc, RBraceLoc, 1599 AttrList.get()); 1600 1601 // C++ 9.2p2: Within the class member-specification, the class is regarded as 1602 // complete within function bodies, default arguments, 1603 // exception-specifications, and constructor ctor-initializers (including 1604 // such things in nested classes). 1605 // 1606 // FIXME: Only function bodies and constructor ctor-initializers are 1607 // parsed correctly, fix the rest. 1608 if (NonNestedClass) { 1609 // We are not inside a nested class. This class and its nested classes 1610 // are complete and we can parse the delayed portions of method 1611 // declarations and the lexed inline method definitions. 1612 ParseLexedMethodDeclarations(getCurrentClass()); 1613 ParseLexedMethodDefs(getCurrentClass()); 1614 } 1615 1616 Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc); 1617 1618 // Leave the class scope. 1619 ParsingDef.Pop(); 1620 ClassScope.Exit(); 1621} 1622 1623/// ParseConstructorInitializer - Parse a C++ constructor initializer, 1624/// which explicitly initializes the members or base classes of a 1625/// class (C++ [class.base.init]). For example, the three initializers 1626/// after the ':' in the Derived constructor below: 1627/// 1628/// @code 1629/// class Base { }; 1630/// class Derived : Base { 1631/// int x; 1632/// float f; 1633/// public: 1634/// Derived(float f) : Base(), x(17), f(f) { } 1635/// }; 1636/// @endcode 1637/// 1638/// [C++] ctor-initializer: 1639/// ':' mem-initializer-list 1640/// 1641/// [C++] mem-initializer-list: 1642/// mem-initializer 1643/// mem-initializer , mem-initializer-list 1644void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) { 1645 assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'"); 1646 1647 SourceLocation ColonLoc = ConsumeToken(); 1648 1649 llvm::SmallVector<MemInitTy*, 4> MemInitializers; 1650 bool AnyErrors = false; 1651 1652 do { 1653 MemInitResult MemInit = ParseMemInitializer(ConstructorDecl); 1654 if (!MemInit.isInvalid()) 1655 MemInitializers.push_back(MemInit.get()); 1656 else 1657 AnyErrors = true; 1658 1659 if (Tok.is(tok::comma)) 1660 ConsumeToken(); 1661 else if (Tok.is(tok::l_brace)) 1662 break; 1663 else { 1664 // Skip over garbage, until we get to '{'. Don't eat the '{'. 1665 Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma); 1666 SkipUntil(tok::l_brace, true, true); 1667 break; 1668 } 1669 } while (true); 1670 1671 Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc, 1672 MemInitializers.data(), MemInitializers.size(), 1673 AnyErrors); 1674} 1675 1676/// ParseMemInitializer - Parse a C++ member initializer, which is 1677/// part of a constructor initializer that explicitly initializes one 1678/// member or base class (C++ [class.base.init]). See 1679/// ParseConstructorInitializer for an example. 1680/// 1681/// [C++] mem-initializer: 1682/// mem-initializer-id '(' expression-list[opt] ')' 1683/// 1684/// [C++] mem-initializer-id: 1685/// '::'[opt] nested-name-specifier[opt] class-name 1686/// identifier 1687Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) { 1688 // parse '::'[opt] nested-name-specifier[opt] 1689 CXXScopeSpec SS; 1690 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false); 1691 TypeTy *TemplateTypeTy = 0; 1692 if (Tok.is(tok::annot_template_id)) { 1693 TemplateIdAnnotation *TemplateId 1694 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1695 if (TemplateId->Kind == TNK_Type_template || 1696 TemplateId->Kind == TNK_Dependent_template_name) { 1697 AnnotateTemplateIdTokenAsType(&SS); 1698 assert(Tok.is(tok::annot_typename) && "template-id -> type failed"); 1699 TemplateTypeTy = Tok.getAnnotationValue(); 1700 } 1701 } 1702 if (!TemplateTypeTy && Tok.isNot(tok::identifier)) { 1703 Diag(Tok, diag::err_expected_member_or_base_name); 1704 return true; 1705 } 1706 1707 // Get the identifier. This may be a member name or a class name, 1708 // but we'll let the semantic analysis determine which it is. 1709 IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0; 1710 SourceLocation IdLoc = ConsumeToken(); 1711 1712 // Parse the '('. 1713 if (Tok.isNot(tok::l_paren)) { 1714 Diag(Tok, diag::err_expected_lparen); 1715 return true; 1716 } 1717 SourceLocation LParenLoc = ConsumeParen(); 1718 1719 // Parse the optional expression-list. 1720 ExprVector ArgExprs(Actions); 1721 CommaLocsTy CommaLocs; 1722 if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) { 1723 SkipUntil(tok::r_paren); 1724 return true; 1725 } 1726 1727 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1728 1729 return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II, 1730 TemplateTypeTy, IdLoc, 1731 LParenLoc, ArgExprs.take(), 1732 ArgExprs.size(), CommaLocs.data(), 1733 RParenLoc); 1734} 1735 1736/// ParseExceptionSpecification - Parse a C++ exception-specification 1737/// (C++ [except.spec]). 1738/// 1739/// exception-specification: 1740/// 'throw' '(' type-id-list [opt] ')' 1741/// [MS] 'throw' '(' '...' ')' 1742/// 1743/// type-id-list: 1744/// type-id 1745/// type-id-list ',' type-id 1746/// 1747bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc, 1748 llvm::SmallVector<TypeTy*, 2> 1749 &Exceptions, 1750 llvm::SmallVector<SourceRange, 2> 1751 &Ranges, 1752 bool &hasAnyExceptionSpec) { 1753 assert(Tok.is(tok::kw_throw) && "expected throw"); 1754 1755 SourceLocation ThrowLoc = ConsumeToken(); 1756 1757 if (!Tok.is(tok::l_paren)) { 1758 return Diag(Tok, diag::err_expected_lparen_after) << "throw"; 1759 } 1760 SourceLocation LParenLoc = ConsumeParen(); 1761 1762 // Parse throw(...), a Microsoft extension that means "this function 1763 // can throw anything". 1764 if (Tok.is(tok::ellipsis)) { 1765 hasAnyExceptionSpec = true; 1766 SourceLocation EllipsisLoc = ConsumeToken(); 1767 if (!getLang().Microsoft) 1768 Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec); 1769 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1770 return false; 1771 } 1772 1773 // Parse the sequence of type-ids. 1774 SourceRange Range; 1775 while (Tok.isNot(tok::r_paren)) { 1776 TypeResult Res(ParseTypeName(&Range)); 1777 if (!Res.isInvalid()) { 1778 Exceptions.push_back(Res.get()); 1779 Ranges.push_back(Range); 1780 } 1781 if (Tok.is(tok::comma)) 1782 ConsumeToken(); 1783 else 1784 break; 1785 } 1786 1787 EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1788 return false; 1789} 1790 1791/// \brief We have just started parsing the definition of a new class, 1792/// so push that class onto our stack of classes that is currently 1793/// being parsed. 1794void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) { 1795 assert((NonNestedClass || !ClassStack.empty()) && 1796 "Nested class without outer class"); 1797 ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass)); 1798} 1799 1800/// \brief Deallocate the given parsed class and all of its nested 1801/// classes. 1802void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) { 1803 for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I) 1804 DeallocateParsedClasses(Class->NestedClasses[I]); 1805 delete Class; 1806} 1807 1808/// \brief Pop the top class of the stack of classes that are 1809/// currently being parsed. 1810/// 1811/// This routine should be called when we have finished parsing the 1812/// definition of a class, but have not yet popped the Scope 1813/// associated with the class's definition. 1814/// 1815/// \returns true if the class we've popped is a top-level class, 1816/// false otherwise. 1817void Parser::PopParsingClass() { 1818 assert(!ClassStack.empty() && "Mismatched push/pop for class parsing"); 1819 1820 ParsingClass *Victim = ClassStack.top(); 1821 ClassStack.pop(); 1822 if (Victim->TopLevelClass) { 1823 // Deallocate all of the nested classes of this class, 1824 // recursively: we don't need to keep any of this information. 1825 DeallocateParsedClasses(Victim); 1826 return; 1827 } 1828 assert(!ClassStack.empty() && "Missing top-level class?"); 1829 1830 if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() && 1831 Victim->NestedClasses.empty()) { 1832 // The victim is a nested class, but we will not need to perform 1833 // any processing after the definition of this class since it has 1834 // no members whose handling was delayed. Therefore, we can just 1835 // remove this nested class. 1836 delete Victim; 1837 return; 1838 } 1839 1840 // This nested class has some members that will need to be processed 1841 // after the top-level class is completely defined. Therefore, add 1842 // it to the list of nested classes within its parent. 1843 assert(CurScope->isClassScope() && "Nested class outside of class scope?"); 1844 ClassStack.top()->NestedClasses.push_back(Victim); 1845 Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope(); 1846} 1847 1848/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only 1849/// parses standard attributes. 1850/// 1851/// [C++0x] attribute-specifier: 1852/// '[' '[' attribute-list ']' ']' 1853/// 1854/// [C++0x] attribute-list: 1855/// attribute[opt] 1856/// attribute-list ',' attribute[opt] 1857/// 1858/// [C++0x] attribute: 1859/// attribute-token attribute-argument-clause[opt] 1860/// 1861/// [C++0x] attribute-token: 1862/// identifier 1863/// attribute-scoped-token 1864/// 1865/// [C++0x] attribute-scoped-token: 1866/// attribute-namespace '::' identifier 1867/// 1868/// [C++0x] attribute-namespace: 1869/// identifier 1870/// 1871/// [C++0x] attribute-argument-clause: 1872/// '(' balanced-token-seq ')' 1873/// 1874/// [C++0x] balanced-token-seq: 1875/// balanced-token 1876/// balanced-token-seq balanced-token 1877/// 1878/// [C++0x] balanced-token: 1879/// '(' balanced-token-seq ')' 1880/// '[' balanced-token-seq ']' 1881/// '{' balanced-token-seq '}' 1882/// any token but '(', ')', '[', ']', '{', or '}' 1883CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) { 1884 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square) 1885 && "Not a C++0x attribute list"); 1886 1887 SourceLocation StartLoc = Tok.getLocation(), Loc; 1888 AttributeList *CurrAttr = 0; 1889 1890 ConsumeBracket(); 1891 ConsumeBracket(); 1892 1893 if (Tok.is(tok::comma)) { 1894 Diag(Tok.getLocation(), diag::err_expected_ident); 1895 ConsumeToken(); 1896 } 1897 1898 while (Tok.is(tok::identifier) || Tok.is(tok::comma)) { 1899 // attribute not present 1900 if (Tok.is(tok::comma)) { 1901 ConsumeToken(); 1902 continue; 1903 } 1904 1905 IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo(); 1906 SourceLocation ScopeLoc, AttrLoc = ConsumeToken(); 1907 1908 // scoped attribute 1909 if (Tok.is(tok::coloncolon)) { 1910 ConsumeToken(); 1911 1912 if (!Tok.is(tok::identifier)) { 1913 Diag(Tok.getLocation(), diag::err_expected_ident); 1914 SkipUntil(tok::r_square, tok::comma, true, true); 1915 continue; 1916 } 1917 1918 ScopeName = AttrName; 1919 ScopeLoc = AttrLoc; 1920 1921 AttrName = Tok.getIdentifierInfo(); 1922 AttrLoc = ConsumeToken(); 1923 } 1924 1925 bool AttrParsed = false; 1926 // No scoped names are supported; ideally we could put all non-standard 1927 // attributes into namespaces. 1928 if (!ScopeName) { 1929 switch(AttributeList::getKind(AttrName)) 1930 { 1931 // No arguments 1932 case AttributeList::AT_base_check: 1933 case AttributeList::AT_carries_dependency: 1934 case AttributeList::AT_final: 1935 case AttributeList::AT_hiding: 1936 case AttributeList::AT_noreturn: 1937 case AttributeList::AT_override: { 1938 if (Tok.is(tok::l_paren)) { 1939 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments) 1940 << AttrName->getName(); 1941 break; 1942 } 1943 1944 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0, 1945 SourceLocation(), 0, 0, CurrAttr, false, 1946 true); 1947 AttrParsed = true; 1948 break; 1949 } 1950 1951 // One argument; must be a type-id or assignment-expression 1952 case AttributeList::AT_aligned: { 1953 if (Tok.isNot(tok::l_paren)) { 1954 Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments) 1955 << AttrName->getName(); 1956 break; 1957 } 1958 SourceLocation ParamLoc = ConsumeParen(); 1959 1960 OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc); 1961 1962 MatchRHSPunctuation(tok::r_paren, ParamLoc); 1963 1964 ExprVector ArgExprs(Actions); 1965 ArgExprs.push_back(ArgExpr.release()); 1966 CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 1967 0, ParamLoc, ArgExprs.take(), 1, CurrAttr, 1968 false, true); 1969 1970 AttrParsed = true; 1971 break; 1972 } 1973 1974 // Silence warnings 1975 default: break; 1976 } 1977 } 1978 1979 // Skip the entire parameter clause, if any 1980 if (!AttrParsed && Tok.is(tok::l_paren)) { 1981 ConsumeParen(); 1982 // SkipUntil maintains the balancedness of tokens. 1983 SkipUntil(tok::r_paren, false); 1984 } 1985 } 1986 1987 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1988 SkipUntil(tok::r_square, false); 1989 Loc = Tok.getLocation(); 1990 if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare)) 1991 SkipUntil(tok::r_square, false); 1992 1993 CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true); 1994 return Attr; 1995} 1996 1997/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]] 1998/// attribute. 1999/// 2000/// FIXME: Simply returns an alignof() expression if the argument is a 2001/// type. Ideally, the type should be propagated directly into Sema. 2002/// 2003/// [C++0x] 'align' '(' type-id ')' 2004/// [C++0x] 'align' '(' assignment-expression ')' 2005Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) { 2006 if (isTypeIdInParens()) { 2007 EnterExpressionEvaluationContext Unevaluated(Actions, 2008 Action::Unevaluated); 2009 SourceLocation TypeLoc = Tok.getLocation(); 2010 TypeTy *Ty = ParseTypeName().get(); 2011 SourceRange TypeRange(Start, Tok.getLocation()); 2012 return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty, 2013 TypeRange); 2014 } else 2015 return ParseConstantExpression(); 2016} 2017