ParseTemplate.cpp revision 226890
1193326Sed//===--- ParseTemplate.cpp - Template Parsing -----------------------------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10193326Sed// This file implements parsing of C++ templates. 11193326Sed// 12193326Sed//===----------------------------------------------------------------------===// 13193326Sed 14193326Sed#include "clang/Parse/Parser.h" 15193326Sed#include "clang/Parse/ParseDiagnostic.h" 16212904Sdim#include "clang/Sema/DeclSpec.h" 17212904Sdim#include "clang/Sema/ParsedTemplate.h" 18212904Sdim#include "clang/Sema/Scope.h" 19200583Srdivacky#include "RAIIObjectsForParser.h" 20221345Sdim#include "clang/AST/DeclTemplate.h" 21221345Sdim#include "clang/AST/ASTConsumer.h" 22193326Sedusing namespace clang; 23193326Sed 24193326Sed/// \brief Parse a template declaration, explicit instantiation, or 25193326Sed/// explicit specialization. 26212904SdimDecl * 27193326SedParser::ParseDeclarationStartingWithTemplate(unsigned Context, 28193326Sed SourceLocation &DeclEnd, 29226890Sdim AccessSpecifier AS, 30226890Sdim AttributeList *AccessAttrs) { 31226890Sdim ObjCDeclContextSwitch ObjCDC(*this); 32226890Sdim 33226890Sdim if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) { 34198092Srdivacky return ParseExplicitInstantiation(SourceLocation(), ConsumeToken(), 35226890Sdim DeclEnd); 36226890Sdim } 37226890Sdim return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS, 38226890Sdim AccessAttrs); 39193326Sed} 40193326Sed 41198092Srdivacky/// \brief RAII class that manages the template parameter depth. 42198092Srdivackynamespace { 43199990Srdivacky class TemplateParameterDepthCounter { 44198092Srdivacky unsigned &Depth; 45198092Srdivacky unsigned AddedLevels; 46198092Srdivacky 47198092Srdivacky public: 48198092Srdivacky explicit TemplateParameterDepthCounter(unsigned &Depth) 49198092Srdivacky : Depth(Depth), AddedLevels(0) { } 50198092Srdivacky 51198092Srdivacky ~TemplateParameterDepthCounter() { 52198092Srdivacky Depth -= AddedLevels; 53198092Srdivacky } 54198092Srdivacky 55198092Srdivacky void operator++() { 56198092Srdivacky ++Depth; 57198092Srdivacky ++AddedLevels; 58198092Srdivacky } 59198092Srdivacky 60198092Srdivacky operator unsigned() const { return Depth; } 61198092Srdivacky }; 62198092Srdivacky} 63198092Srdivacky 64193326Sed/// \brief Parse a template declaration or an explicit specialization. 65193326Sed/// 66193326Sed/// Template declarations include one or more template parameter lists 67193326Sed/// and either the function or class template declaration. Explicit 68193326Sed/// specializations contain one or more 'template < >' prefixes 69193326Sed/// followed by a (possibly templated) declaration. Since the 70193326Sed/// syntactic form of both features is nearly identical, we parse all 71193326Sed/// of the template headers together and let semantic analysis sort 72193326Sed/// the declarations from the explicit specializations. 73193326Sed/// 74193326Sed/// template-declaration: [C++ temp] 75193326Sed/// 'export'[opt] 'template' '<' template-parameter-list '>' declaration 76193326Sed/// 77193326Sed/// explicit-specialization: [ C++ temp.expl.spec] 78193326Sed/// 'template' '<' '>' declaration 79212904SdimDecl * 80193326SedParser::ParseTemplateDeclarationOrSpecialization(unsigned Context, 81193326Sed SourceLocation &DeclEnd, 82226890Sdim AccessSpecifier AS, 83226890Sdim AttributeList *AccessAttrs) { 84198092Srdivacky assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) && 85198092Srdivacky "Token does not start a template declaration."); 86198092Srdivacky 87193326Sed // Enter template-parameter scope. 88193326Sed ParseScope TemplateParmScope(this, Scope::TemplateParamScope); 89193326Sed 90212904Sdim // Tell the action that names should be checked in the context of 91212904Sdim // the declaration to come. 92212904Sdim ParsingDeclRAIIObject ParsingTemplateParams(*this); 93212904Sdim 94193326Sed // Parse multiple levels of template headers within this template 95193326Sed // parameter scope, e.g., 96193326Sed // 97193326Sed // template<typename T> 98193326Sed // template<typename U> 99193326Sed // class A<T>::B { ... }; 100193326Sed // 101193326Sed // We parse multiple levels non-recursively so that we can build a 102193326Sed // single data structure containing all of the template parameter 103193326Sed // lists to easily differentiate between the case above and: 104193326Sed // 105193326Sed // template<typename T> 106193326Sed // class A { 107193326Sed // template<typename U> class B; 108193326Sed // }; 109193326Sed // 110193326Sed // In the first case, the action for declaring A<T>::B receives 111193326Sed // both template parameter lists. In the second case, the action for 112193326Sed // defining A<T>::B receives just the inner template parameter list 113193326Sed // (and retrieves the outer template parameter list from its 114193326Sed // context). 115198092Srdivacky bool isSpecialization = true; 116198893Srdivacky bool LastParamListWasEmpty = false; 117193326Sed TemplateParameterLists ParamLists; 118198092Srdivacky TemplateParameterDepthCounter Depth(TemplateParameterDepth); 119193326Sed do { 120193326Sed // Consume the 'export', if any. 121193326Sed SourceLocation ExportLoc; 122193326Sed if (Tok.is(tok::kw_export)) { 123193326Sed ExportLoc = ConsumeToken(); 124193326Sed } 125193326Sed 126193326Sed // Consume the 'template', which should be here. 127193326Sed SourceLocation TemplateLoc; 128193326Sed if (Tok.is(tok::kw_template)) { 129193326Sed TemplateLoc = ConsumeToken(); 130193326Sed } else { 131193326Sed Diag(Tok.getLocation(), diag::err_expected_template); 132212904Sdim return 0; 133193326Sed } 134198092Srdivacky 135193326Sed // Parse the '<' template-parameter-list '>' 136193326Sed SourceLocation LAngleLoc, RAngleLoc; 137226890Sdim SmallVector<Decl*, 4> TemplateParams; 138198092Srdivacky if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc, 139198092Srdivacky RAngleLoc)) { 140198092Srdivacky // Skip until the semi-colon or a }. 141198092Srdivacky SkipUntil(tok::r_brace, true, true); 142198092Srdivacky if (Tok.is(tok::semi)) 143198092Srdivacky ConsumeToken(); 144212904Sdim return 0; 145198092Srdivacky } 146193326Sed 147193326Sed ParamLists.push_back( 148198092Srdivacky Actions.ActOnTemplateParameterList(Depth, ExportLoc, 149198092Srdivacky TemplateLoc, LAngleLoc, 150193326Sed TemplateParams.data(), 151193326Sed TemplateParams.size(), RAngleLoc)); 152198092Srdivacky 153198092Srdivacky if (!TemplateParams.empty()) { 154198092Srdivacky isSpecialization = false; 155198092Srdivacky ++Depth; 156198893Srdivacky } else { 157198893Srdivacky LastParamListWasEmpty = true; 158198092Srdivacky } 159193326Sed } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template)); 160193326Sed 161193326Sed // Parse the actual template declaration. 162198092Srdivacky return ParseSingleDeclarationAfterTemplate(Context, 163193326Sed ParsedTemplateInfo(&ParamLists, 164198893Srdivacky isSpecialization, 165198893Srdivacky LastParamListWasEmpty), 166212904Sdim ParsingTemplateParams, 167226890Sdim DeclEnd, AS, AccessAttrs); 168193326Sed} 169193326Sed 170193326Sed/// \brief Parse a single declaration that declares a template, 171193326Sed/// template specialization, or explicit instantiation of a template. 172193326Sed/// 173193326Sed/// \param TemplateParams if non-NULL, the template parameter lists 174193326Sed/// that preceded this declaration. In this case, the declaration is a 175193326Sed/// template declaration, out-of-line definition of a template, or an 176193326Sed/// explicit template specialization. When NULL, the declaration is an 177193326Sed/// explicit template instantiation. 178193326Sed/// 179193326Sed/// \param TemplateLoc when TemplateParams is NULL, the location of 180193326Sed/// the 'template' keyword that indicates that we have an explicit 181193326Sed/// template instantiation. 182193326Sed/// 183193326Sed/// \param DeclEnd will receive the source location of the last token 184193326Sed/// within this declaration. 185193326Sed/// 186193326Sed/// \param AS the access specifier associated with this 187193326Sed/// declaration. Will be AS_none for namespace-scope declarations. 188193326Sed/// 189193326Sed/// \returns the new declaration. 190212904SdimDecl * 191193326SedParser::ParseSingleDeclarationAfterTemplate( 192193326Sed unsigned Context, 193193326Sed const ParsedTemplateInfo &TemplateInfo, 194212904Sdim ParsingDeclRAIIObject &DiagsFromTParams, 195193326Sed SourceLocation &DeclEnd, 196226890Sdim AccessSpecifier AS, 197226890Sdim AttributeList *AccessAttrs) { 198193326Sed assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && 199193326Sed "Template information required"); 200193326Sed 201198092Srdivacky if (Context == Declarator::MemberContext) { 202198092Srdivacky // We are parsing a member template. 203226890Sdim ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo, 204226890Sdim &DiagsFromTParams); 205212904Sdim return 0; 206198092Srdivacky } 207198092Srdivacky 208221345Sdim ParsedAttributesWithRange prefixAttrs(AttrFactory); 209218893Sdim MaybeParseCXX0XAttributes(prefixAttrs); 210218893Sdim 211218893Sdim if (Tok.is(tok::kw_using)) 212218893Sdim return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd, 213218893Sdim prefixAttrs); 214218893Sdim 215212904Sdim // Parse the declaration specifiers, stealing the accumulated 216212904Sdim // diagnostics from the template parameters. 217221345Sdim ParsingDeclSpec DS(*this, &DiagsFromTParams); 218199990Srdivacky 219218893Sdim DS.takeAttributesFrom(prefixAttrs); 220199990Srdivacky 221202379Srdivacky ParseDeclarationSpecifiers(DS, TemplateInfo, AS, 222202379Srdivacky getDeclSpecContextFromDeclaratorContext(Context)); 223193326Sed 224193326Sed if (Tok.is(tok::semi)) { 225193326Sed DeclEnd = ConsumeToken(); 226212904Sdim Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 227198893Srdivacky DS.complete(Decl); 228198893Srdivacky return Decl; 229193326Sed } 230193326Sed 231193326Sed // Parse the declarator. 232198893Srdivacky ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context); 233193326Sed ParseDeclarator(DeclaratorInfo); 234193326Sed // Error parsing the declarator? 235193326Sed if (!DeclaratorInfo.hasName()) { 236193326Sed // If so, skip until the semi-colon or a }. 237193326Sed SkipUntil(tok::r_brace, true, true); 238193326Sed if (Tok.is(tok::semi)) 239193326Sed ConsumeToken(); 240212904Sdim return 0; 241193326Sed } 242198092Srdivacky 243193326Sed // If we have a declaration or declarator list, handle it. 244193326Sed if (isDeclarationAfterDeclarator()) { 245193326Sed // Parse this declaration. 246212904Sdim Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo, 247212904Sdim TemplateInfo); 248193326Sed 249193326Sed if (Tok.is(tok::comma)) { 250193326Sed Diag(Tok, diag::err_multiple_template_declarators) 251193326Sed << (int)TemplateInfo.Kind; 252193326Sed SkipUntil(tok::semi, true, false); 253193326Sed return ThisDecl; 254193326Sed } 255193326Sed 256193326Sed // Eat the semi colon after the declaration. 257198092Srdivacky ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration); 258218893Sdim DeclaratorInfo.complete(ThisDecl); 259193326Sed return ThisDecl; 260193326Sed } 261193326Sed 262193326Sed if (DeclaratorInfo.isFunctionDeclarator() && 263210299Sed isStartOfFunctionDefinition(DeclaratorInfo)) { 264193326Sed if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 265193326Sed Diag(Tok, diag::err_function_declared_typedef); 266193326Sed 267193326Sed if (Tok.is(tok::l_brace)) { 268193326Sed // This recovery skips the entire function body. It would be nice 269193326Sed // to simply call ParseFunctionDefinition() below, however Sema 270193326Sed // assumes the declarator represents a function, not a typedef. 271193326Sed ConsumeBrace(); 272193326Sed SkipUntil(tok::r_brace, true); 273193326Sed } else { 274193326Sed SkipUntil(tok::semi); 275193326Sed } 276212904Sdim return 0; 277193326Sed } 278195099Sed return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo); 279193326Sed } 280193326Sed 281193326Sed if (DeclaratorInfo.isFunctionDeclarator()) 282193326Sed Diag(Tok, diag::err_expected_fn_body); 283193326Sed else 284193326Sed Diag(Tok, diag::err_invalid_token_after_toplevel_declarator); 285193326Sed SkipUntil(tok::semi); 286212904Sdim return 0; 287193326Sed} 288193326Sed 289193326Sed/// ParseTemplateParameters - Parses a template-parameter-list enclosed in 290193326Sed/// angle brackets. Depth is the depth of this template-parameter-list, which 291193326Sed/// is the number of template headers directly enclosing this template header. 292193326Sed/// TemplateParams is the current list of template parameters we're building. 293193326Sed/// The template parameter we parse will be added to this list. LAngleLoc and 294198092Srdivacky/// RAngleLoc will receive the positions of the '<' and '>', respectively, 295193326Sed/// that enclose this template parameter list. 296198092Srdivacky/// 297198092Srdivacky/// \returns true if an error occurred, false otherwise. 298193326Sedbool Parser::ParseTemplateParameters(unsigned Depth, 299226890Sdim SmallVectorImpl<Decl*> &TemplateParams, 300193326Sed SourceLocation &LAngleLoc, 301193326Sed SourceLocation &RAngleLoc) { 302193326Sed // Get the template parameter list. 303198092Srdivacky if (!Tok.is(tok::less)) { 304193326Sed Diag(Tok.getLocation(), diag::err_expected_less_after) << "template"; 305198092Srdivacky return true; 306193326Sed } 307193326Sed LAngleLoc = ConsumeToken(); 308198092Srdivacky 309193326Sed // Try to parse the template parameter list. 310193326Sed if (Tok.is(tok::greater)) 311193326Sed RAngleLoc = ConsumeToken(); 312198092Srdivacky else if (ParseTemplateParameterList(Depth, TemplateParams)) { 313198092Srdivacky if (!Tok.is(tok::greater)) { 314193326Sed Diag(Tok.getLocation(), diag::err_expected_greater); 315198092Srdivacky return true; 316193326Sed } 317193326Sed RAngleLoc = ConsumeToken(); 318193326Sed } 319198092Srdivacky return false; 320193326Sed} 321193326Sed 322193326Sed/// ParseTemplateParameterList - Parse a template parameter list. If 323193326Sed/// the parsing fails badly (i.e., closing bracket was left out), this 324193326Sed/// will try to put the token stream in a reasonable position (closing 325198092Srdivacky/// a statement, etc.) and return false. 326193326Sed/// 327193326Sed/// template-parameter-list: [C++ temp] 328193326Sed/// template-parameter 329193326Sed/// template-parameter-list ',' template-parameter 330198092Srdivackybool 331193326SedParser::ParseTemplateParameterList(unsigned Depth, 332226890Sdim SmallVectorImpl<Decl*> &TemplateParams) { 333198092Srdivacky while (1) { 334212904Sdim if (Decl *TmpParam 335193326Sed = ParseTemplateParameter(Depth, TemplateParams.size())) { 336193326Sed TemplateParams.push_back(TmpParam); 337193326Sed } else { 338193326Sed // If we failed to parse a template parameter, skip until we find 339193326Sed // a comma or closing brace. 340193326Sed SkipUntil(tok::comma, tok::greater, true, true); 341193326Sed } 342198092Srdivacky 343193326Sed // Did we find a comma or the end of the template parmeter list? 344198092Srdivacky if (Tok.is(tok::comma)) { 345193326Sed ConsumeToken(); 346198092Srdivacky } else if (Tok.is(tok::greater)) { 347193326Sed // Don't consume this... that's done by template parser. 348193326Sed break; 349193326Sed } else { 350193326Sed // Somebody probably forgot to close the template. Skip ahead and 351193326Sed // try to get out of the expression. This error is currently 352193326Sed // subsumed by whatever goes on in ParseTemplateParameter. 353193326Sed // TODO: This could match >>, and it would be nice to avoid those 354193326Sed // silly errors with template <vec<T>>. 355218893Sdim Diag(Tok.getLocation(), diag::err_expected_comma_greater); 356193326Sed SkipUntil(tok::greater, true, true); 357193326Sed return false; 358193326Sed } 359193326Sed } 360193326Sed return true; 361193326Sed} 362193326Sed 363199990Srdivacky/// \brief Determine whether the parser is at the start of a template 364199990Srdivacky/// type parameter. 365199990Srdivackybool Parser::isStartOfTemplateTypeParameter() { 366210299Sed if (Tok.is(tok::kw_class)) { 367210299Sed // "class" may be the start of an elaborated-type-specifier or a 368210299Sed // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter. 369210299Sed switch (NextToken().getKind()) { 370210299Sed case tok::equal: 371210299Sed case tok::comma: 372210299Sed case tok::greater: 373210299Sed case tok::greatergreater: 374210299Sed case tok::ellipsis: 375210299Sed return true; 376210299Sed 377210299Sed case tok::identifier: 378210299Sed // This may be either a type-parameter or an elaborated-type-specifier. 379210299Sed // We have to look further. 380210299Sed break; 381210299Sed 382210299Sed default: 383210299Sed return false; 384210299Sed } 385210299Sed 386210299Sed switch (GetLookAheadToken(2).getKind()) { 387210299Sed case tok::equal: 388210299Sed case tok::comma: 389210299Sed case tok::greater: 390210299Sed case tok::greatergreater: 391210299Sed return true; 392210299Sed 393210299Sed default: 394210299Sed return false; 395210299Sed } 396210299Sed } 397199990Srdivacky 398199990Srdivacky if (Tok.isNot(tok::kw_typename)) 399199990Srdivacky return false; 400199990Srdivacky 401199990Srdivacky // C++ [temp.param]p2: 402199990Srdivacky // There is no semantic difference between class and typename in a 403199990Srdivacky // template-parameter. typename followed by an unqualified-id 404199990Srdivacky // names a template type parameter. typename followed by a 405199990Srdivacky // qualified-id denotes the type in a non-type 406199990Srdivacky // parameter-declaration. 407199990Srdivacky Token Next = NextToken(); 408199990Srdivacky 409199990Srdivacky // If we have an identifier, skip over it. 410199990Srdivacky if (Next.getKind() == tok::identifier) 411199990Srdivacky Next = GetLookAheadToken(2); 412199990Srdivacky 413199990Srdivacky switch (Next.getKind()) { 414199990Srdivacky case tok::equal: 415199990Srdivacky case tok::comma: 416199990Srdivacky case tok::greater: 417199990Srdivacky case tok::greatergreater: 418199990Srdivacky case tok::ellipsis: 419199990Srdivacky return true; 420199990Srdivacky 421199990Srdivacky default: 422199990Srdivacky return false; 423199990Srdivacky } 424199990Srdivacky} 425199990Srdivacky 426193326Sed/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]). 427193326Sed/// 428193326Sed/// template-parameter: [C++ temp.param] 429193326Sed/// type-parameter 430193326Sed/// parameter-declaration 431193326Sed/// 432193326Sed/// type-parameter: (see below) 433218893Sdim/// 'class' ...[opt] identifier[opt] 434193326Sed/// 'class' identifier[opt] '=' type-id 435218893Sdim/// 'typename' ...[opt] identifier[opt] 436193326Sed/// 'typename' identifier[opt] '=' type-id 437218893Sdim/// 'template' '<' template-parameter-list '>' 438218893Sdim/// 'class' ...[opt] identifier[opt] 439218893Sdim/// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 440218893Sdim/// = id-expression 441212904SdimDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) { 442199990Srdivacky if (isStartOfTemplateTypeParameter()) 443193326Sed return ParseTypeParameter(Depth, Position); 444198092Srdivacky 445198092Srdivacky if (Tok.is(tok::kw_template)) 446193326Sed return ParseTemplateTemplateParameter(Depth, Position); 447193326Sed 448193326Sed // If it's none of the above, then it must be a parameter declaration. 449193326Sed // NOTE: This will pick up errors in the closure of the template parameter 450193326Sed // list (e.g., template < ; Check here to implement >> style closures. 451193326Sed return ParseNonTypeTemplateParameter(Depth, Position); 452193326Sed} 453193326Sed 454193326Sed/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]). 455193326Sed/// Other kinds of template parameters are parsed in 456193326Sed/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter. 457193326Sed/// 458193326Sed/// type-parameter: [C++ temp.param] 459194179Sed/// 'class' ...[opt][C++0x] identifier[opt] 460193326Sed/// 'class' identifier[opt] '=' type-id 461194179Sed/// 'typename' ...[opt][C++0x] identifier[opt] 462193326Sed/// 'typename' identifier[opt] '=' type-id 463212904SdimDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) { 464193326Sed assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) && 465198092Srdivacky "A type-parameter starts with 'class' or 'typename'"); 466193326Sed 467193326Sed // Consume the 'class' or 'typename' keyword. 468193326Sed bool TypenameKeyword = Tok.is(tok::kw_typename); 469193326Sed SourceLocation KeyLoc = ConsumeToken(); 470193326Sed 471194179Sed // Grab the ellipsis (if given). 472194179Sed bool Ellipsis = false; 473194179Sed SourceLocation EllipsisLoc; 474194179Sed if (Tok.is(tok::ellipsis)) { 475194179Sed Ellipsis = true; 476194179Sed EllipsisLoc = ConsumeToken(); 477198092Srdivacky 478226890Sdim Diag(EllipsisLoc, 479226890Sdim getLang().CPlusPlus0x 480226890Sdim ? diag::warn_cxx98_compat_variadic_templates 481226890Sdim : diag::ext_variadic_templates); 482194179Sed } 483198092Srdivacky 484193326Sed // Grab the template parameter name (if given) 485193326Sed SourceLocation NameLoc; 486193326Sed IdentifierInfo* ParamName = 0; 487198092Srdivacky if (Tok.is(tok::identifier)) { 488193326Sed ParamName = Tok.getIdentifierInfo(); 489193326Sed NameLoc = ConsumeToken(); 490198092Srdivacky } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || 491198092Srdivacky Tok.is(tok::greater)) { 492193326Sed // Unnamed template parameter. Don't have to do anything here, just 493193326Sed // don't consume this token. 494193326Sed } else { 495193326Sed Diag(Tok.getLocation(), diag::err_expected_ident); 496212904Sdim return 0; 497193326Sed } 498198092Srdivacky 499210299Sed // Grab a default argument (if available). 500210299Sed // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 501210299Sed // we introduce the type parameter into the local scope. 502210299Sed SourceLocation EqualLoc; 503212904Sdim ParsedType DefaultArg; 504198092Srdivacky if (Tok.is(tok::equal)) { 505210299Sed EqualLoc = ConsumeToken(); 506210299Sed DefaultArg = ParseTypeName().get(); 507193326Sed } 508210299Sed 509210299Sed return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis, 510210299Sed EllipsisLoc, KeyLoc, ParamName, NameLoc, 511210299Sed Depth, Position, EqualLoc, DefaultArg); 512193326Sed} 513193326Sed 514193326Sed/// ParseTemplateTemplateParameter - Handle the parsing of template 515198092Srdivacky/// template parameters. 516193326Sed/// 517193326Sed/// type-parameter: [C++ temp.param] 518218893Sdim/// 'template' '<' template-parameter-list '>' 'class' 519218893Sdim/// ...[opt] identifier[opt] 520218893Sdim/// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 521218893Sdim/// = id-expression 522212904SdimDecl * 523193326SedParser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) { 524193326Sed assert(Tok.is(tok::kw_template) && "Expected 'template' keyword"); 525193326Sed 526193326Sed // Handle the template <...> part. 527193326Sed SourceLocation TemplateLoc = ConsumeToken(); 528226890Sdim SmallVector<Decl*,8> TemplateParams; 529193326Sed SourceLocation LAngleLoc, RAngleLoc; 530193326Sed { 531193326Sed ParseScope TemplateParmScope(this, Scope::TemplateParamScope); 532198092Srdivacky if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc, 533198092Srdivacky RAngleLoc)) { 534212904Sdim return 0; 535193326Sed } 536193326Sed } 537193326Sed 538193326Sed // Generate a meaningful error if the user forgot to put class before the 539193326Sed // identifier, comma, or greater. 540198092Srdivacky if (!Tok.is(tok::kw_class)) { 541198092Srdivacky Diag(Tok.getLocation(), diag::err_expected_class_before) 542193326Sed << PP.getSpelling(Tok); 543212904Sdim return 0; 544193326Sed } 545218893Sdim ConsumeToken(); 546193326Sed 547218893Sdim // Parse the ellipsis, if given. 548218893Sdim SourceLocation EllipsisLoc; 549218893Sdim if (Tok.is(tok::ellipsis)) { 550218893Sdim EllipsisLoc = ConsumeToken(); 551218893Sdim 552226890Sdim Diag(EllipsisLoc, 553226890Sdim getLang().CPlusPlus0x 554226890Sdim ? diag::warn_cxx98_compat_variadic_templates 555226890Sdim : diag::ext_variadic_templates); 556218893Sdim } 557218893Sdim 558193326Sed // Get the identifier, if given. 559193326Sed SourceLocation NameLoc; 560193326Sed IdentifierInfo* ParamName = 0; 561198092Srdivacky if (Tok.is(tok::identifier)) { 562193326Sed ParamName = Tok.getIdentifierInfo(); 563193326Sed NameLoc = ConsumeToken(); 564198092Srdivacky } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) { 565193326Sed // Unnamed template parameter. Don't have to do anything here, just 566193326Sed // don't consume this token. 567193326Sed } else { 568193326Sed Diag(Tok.getLocation(), diag::err_expected_ident); 569212904Sdim return 0; 570193326Sed } 571193326Sed 572226890Sdim TemplateParameterList *ParamList = 573193326Sed Actions.ActOnTemplateParameterList(Depth, SourceLocation(), 574193326Sed TemplateLoc, LAngleLoc, 575218893Sdim TemplateParams.data(), 576193326Sed TemplateParams.size(), 577193326Sed RAngleLoc); 578193326Sed 579210299Sed // Grab a default argument (if available). 580210299Sed // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 581210299Sed // we introduce the template parameter into the local scope. 582210299Sed SourceLocation EqualLoc; 583210299Sed ParsedTemplateArgument DefaultArg; 584193326Sed if (Tok.is(tok::equal)) { 585210299Sed EqualLoc = ConsumeToken(); 586210299Sed DefaultArg = ParseTemplateTemplateArgument(); 587210299Sed if (DefaultArg.isInvalid()) { 588199482Srdivacky Diag(Tok.getLocation(), 589199482Srdivacky diag::err_default_template_template_parameter_not_template); 590200583Srdivacky static const tok::TokenKind EndToks[] = { 591199482Srdivacky tok::comma, tok::greater, tok::greatergreater 592199482Srdivacky }; 593199482Srdivacky SkipUntil(EndToks, 3, true, true); 594210299Sed } 595193326Sed } 596210299Sed 597210299Sed return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc, 598218893Sdim ParamList, EllipsisLoc, 599218893Sdim ParamName, NameLoc, Depth, 600218893Sdim Position, EqualLoc, DefaultArg); 601193326Sed} 602193326Sed 603193326Sed/// ParseNonTypeTemplateParameter - Handle the parsing of non-type 604198092Srdivacky/// template parameters (e.g., in "template<int Size> class array;"). 605193326Sed/// 606193326Sed/// template-parameter: 607193326Sed/// ... 608193326Sed/// parameter-declaration 609212904SdimDecl * 610193326SedParser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) { 611193326Sed // Parse the declaration-specifiers (i.e., the type). 612193326Sed // FIXME: The type should probably be restricted in some way... Not all 613193326Sed // declarators (parts of declarators?) are accepted for parameters. 614221345Sdim DeclSpec DS(AttrFactory); 615193326Sed ParseDeclarationSpecifiers(DS); 616193326Sed 617193326Sed // Parse this as a typename. 618193326Sed Declarator ParamDecl(DS, Declarator::TemplateParamContext); 619193326Sed ParseDeclarator(ParamDecl); 620212904Sdim if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 621193326Sed // This probably shouldn't happen - and it's more of a Sema thing, but 622193326Sed // basically we didn't parse the type name because we couldn't associate 623193326Sed // it with an AST node. we should just skip to the comma or greater. 624193326Sed // TODO: This is currently a placeholder for some kind of Sema Error. 625193326Sed Diag(Tok.getLocation(), diag::err_parse_error); 626193326Sed SkipUntil(tok::comma, tok::greater, true, true); 627212904Sdim return 0; 628193326Sed } 629193326Sed 630193326Sed // If there is a default value, parse it. 631210299Sed // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 632210299Sed // we introduce the template parameter into the local scope. 633210299Sed SourceLocation EqualLoc; 634212904Sdim ExprResult DefaultArg; 635193326Sed if (Tok.is(tok::equal)) { 636210299Sed EqualLoc = ConsumeToken(); 637193326Sed 638193326Sed // C++ [temp.param]p15: 639193326Sed // When parsing a default template-argument for a non-type 640193326Sed // template-parameter, the first non-nested > is taken as the 641193326Sed // end of the template-parameter-list rather than a greater-than 642193326Sed // operator. 643198092Srdivacky GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 644193326Sed 645210299Sed DefaultArg = ParseAssignmentExpression(); 646193326Sed if (DefaultArg.isInvalid()) 647193326Sed SkipUntil(tok::comma, tok::greater, true, true); 648193326Sed } 649198092Srdivacky 650210299Sed // Create the parameter. 651210299Sed return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl, 652210299Sed Depth, Position, EqualLoc, 653212904Sdim DefaultArg.take()); 654193326Sed} 655193326Sed 656193326Sed/// \brief Parses a template-id that after the template name has 657193326Sed/// already been parsed. 658193326Sed/// 659193326Sed/// This routine takes care of parsing the enclosed template argument 660193326Sed/// list ('<' template-parameter-list [opt] '>') and placing the 661193326Sed/// results into a form that can be transferred to semantic analysis. 662193326Sed/// 663193326Sed/// \param Template the template declaration produced by isTemplateName 664193326Sed/// 665193326Sed/// \param TemplateNameLoc the source location of the template name 666193326Sed/// 667193326Sed/// \param SS if non-NULL, the nested-name-specifier preceding the 668193326Sed/// template name. 669193326Sed/// 670193326Sed/// \param ConsumeLastToken if true, then we will consume the last 671193326Sed/// token that forms the template-id. Otherwise, we will leave the 672193326Sed/// last token in the stream (e.g., so that it can be replaced with an 673193326Sed/// annotation token). 674198092Srdivackybool 675193326SedParser::ParseTemplateIdAfterTemplateName(TemplateTy Template, 676198092Srdivacky SourceLocation TemplateNameLoc, 677221345Sdim const CXXScopeSpec &SS, 678193326Sed bool ConsumeLastToken, 679193326Sed SourceLocation &LAngleLoc, 680193326Sed TemplateArgList &TemplateArgs, 681193326Sed SourceLocation &RAngleLoc) { 682193326Sed assert(Tok.is(tok::less) && "Must have already parsed the template-name"); 683193326Sed 684193326Sed // Consume the '<'. 685193326Sed LAngleLoc = ConsumeToken(); 686193326Sed 687193326Sed // Parse the optional template-argument-list. 688193326Sed bool Invalid = false; 689193326Sed { 690193326Sed GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 691218893Sdim if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) 692199482Srdivacky Invalid = ParseTemplateArgumentList(TemplateArgs); 693193326Sed 694193326Sed if (Invalid) { 695193326Sed // Try to find the closing '>'. 696193326Sed SkipUntil(tok::greater, true, !ConsumeLastToken); 697193326Sed 698193326Sed return true; 699193326Sed } 700193326Sed } 701193326Sed 702201361Srdivacky if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) { 703201361Srdivacky Diag(Tok.getLocation(), diag::err_expected_greater); 704193326Sed return true; 705201361Srdivacky } 706193326Sed 707193326Sed // Determine the location of the '>' or '>>'. Only consume this 708193326Sed // token if the caller asked us to. 709193326Sed RAngleLoc = Tok.getLocation(); 710193326Sed 711193326Sed if (Tok.is(tok::greatergreater)) { 712193326Sed if (!getLang().CPlusPlus0x) { 713193326Sed const char *ReplaceStr = "> >"; 714193326Sed if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater)) 715193326Sed ReplaceStr = "> > "; 716193326Sed 717193326Sed Diag(Tok.getLocation(), diag::err_two_right_angle_brackets_need_space) 718206084Srdivacky << FixItHint::CreateReplacement( 719193326Sed SourceRange(Tok.getLocation()), ReplaceStr); 720193326Sed } 721193326Sed 722193326Sed Tok.setKind(tok::greater); 723193326Sed if (!ConsumeLastToken) { 724193326Sed // Since we're not supposed to consume the '>>' token, we need 725193326Sed // to insert a second '>' token after the first. 726193326Sed PP.EnterToken(Tok); 727193326Sed } 728193326Sed } else if (ConsumeLastToken) 729193326Sed ConsumeToken(); 730193326Sed 731193326Sed return false; 732193326Sed} 733198092Srdivacky 734193326Sed/// \brief Replace the tokens that form a simple-template-id with an 735193326Sed/// annotation token containing the complete template-id. 736193326Sed/// 737193326Sed/// The first token in the stream must be the name of a template that 738193326Sed/// is followed by a '<'. This routine will parse the complete 739193326Sed/// simple-template-id and replace the tokens with a single annotation 740193326Sed/// token with one of two different kinds: if the template-id names a 741193326Sed/// type (and \p AllowTypeAnnotation is true), the annotation token is 742193326Sed/// a type annotation that includes the optional nested-name-specifier 743193326Sed/// (\p SS). Otherwise, the annotation token is a template-id 744193326Sed/// annotation that does not include the optional 745193326Sed/// nested-name-specifier. 746193326Sed/// 747193326Sed/// \param Template the declaration of the template named by the first 748193326Sed/// token (an identifier), as returned from \c Action::isTemplateName(). 749193326Sed/// 750193326Sed/// \param TemplateNameKind the kind of template that \p Template 751193326Sed/// refers to, as returned from \c Action::isTemplateName(). 752193326Sed/// 753193326Sed/// \param SS if non-NULL, the nested-name-specifier that precedes 754193326Sed/// this template name. 755193326Sed/// 756193326Sed/// \param TemplateKWLoc if valid, specifies that this template-id 757193326Sed/// annotation was preceded by the 'template' keyword and gives the 758193326Sed/// location of that keyword. If invalid (the default), then this 759193326Sed/// template-id was not preceded by a 'template' keyword. 760193326Sed/// 761193326Sed/// \param AllowTypeAnnotation if true (the default), then a 762193326Sed/// simple-template-id that refers to a class template, template 763193326Sed/// template parameter, or other template that produces a type will be 764193326Sed/// replaced with a type annotation token. Otherwise, the 765193326Sed/// simple-template-id is always replaced with a template-id 766193326Sed/// annotation token. 767195099Sed/// 768195099Sed/// If an unrecoverable parse error occurs and no annotation token can be 769195099Sed/// formed, this function returns true. 770195099Sed/// 771195099Sedbool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK, 772221345Sdim CXXScopeSpec &SS, 773198893Srdivacky UnqualifiedId &TemplateName, 774193326Sed SourceLocation TemplateKWLoc, 775193326Sed bool AllowTypeAnnotation) { 776193326Sed assert(getLang().CPlusPlus && "Can only annotate template-ids in C++"); 777198893Srdivacky assert(Template && Tok.is(tok::less) && 778193326Sed "Parser isn't at the beginning of a template-id"); 779193326Sed 780193326Sed // Consume the template-name. 781198893Srdivacky SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin(); 782193326Sed 783193326Sed // Parse the enclosed template argument list. 784193326Sed SourceLocation LAngleLoc, RAngleLoc; 785193326Sed TemplateArgList TemplateArgs; 786198893Srdivacky bool Invalid = ParseTemplateIdAfterTemplateName(Template, 787198893Srdivacky TemplateNameLoc, 788198092Srdivacky SS, false, LAngleLoc, 789198092Srdivacky TemplateArgs, 790193326Sed RAngleLoc); 791198092Srdivacky 792195099Sed if (Invalid) { 793195099Sed // If we failed to parse the template ID but skipped ahead to a >, we're not 794195099Sed // going to be able to form a token annotation. Eat the '>' if present. 795195099Sed if (Tok.is(tok::greater)) 796195099Sed ConsumeToken(); 797195099Sed return true; 798195099Sed } 799193326Sed 800193326Sed ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(), 801193326Sed TemplateArgs.size()); 802193326Sed 803193326Sed // Build the annotation token. 804193326Sed if (TNK == TNK_Type_template && AllowTypeAnnotation) { 805212904Sdim TypeResult Type 806221345Sdim = Actions.ActOnTemplateIdType(SS, 807221345Sdim Template, TemplateNameLoc, 808193326Sed LAngleLoc, TemplateArgsPtr, 809193326Sed RAngleLoc); 810195099Sed if (Type.isInvalid()) { 811195099Sed // If we failed to parse the template ID but skipped ahead to a >, we're not 812195099Sed // going to be able to form a token annotation. Eat the '>' if present. 813195099Sed if (Tok.is(tok::greater)) 814195099Sed ConsumeToken(); 815195099Sed return true; 816195099Sed } 817193326Sed 818193326Sed Tok.setKind(tok::annot_typename); 819212904Sdim setTypeAnnotation(Tok, Type.get()); 820221345Sdim if (SS.isNotEmpty()) 821221345Sdim Tok.setLocation(SS.getBeginLoc()); 822193326Sed else if (TemplateKWLoc.isValid()) 823193326Sed Tok.setLocation(TemplateKWLoc); 824198092Srdivacky else 825193326Sed Tok.setLocation(TemplateNameLoc); 826193326Sed } else { 827193326Sed // Build a template-id annotation token that can be processed 828193326Sed // later. 829193326Sed Tok.setKind(tok::annot_template_id); 830198092Srdivacky TemplateIdAnnotation *TemplateId 831193326Sed = TemplateIdAnnotation::Allocate(TemplateArgs.size()); 832193326Sed TemplateId->TemplateNameLoc = TemplateNameLoc; 833198893Srdivacky if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) { 834198893Srdivacky TemplateId->Name = TemplateName.Identifier; 835198893Srdivacky TemplateId->Operator = OO_None; 836198893Srdivacky } else { 837198893Srdivacky TemplateId->Name = 0; 838198893Srdivacky TemplateId->Operator = TemplateName.OperatorFunctionId.Operator; 839198893Srdivacky } 840221345Sdim TemplateId->SS = SS; 841212904Sdim TemplateId->Template = Template; 842193326Sed TemplateId->Kind = TNK; 843193326Sed TemplateId->LAngleLoc = LAngleLoc; 844193326Sed TemplateId->RAngleLoc = RAngleLoc; 845199482Srdivacky ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 846199482Srdivacky for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg) 847219077Sdim Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]); 848193326Sed Tok.setAnnotationValue(TemplateId); 849193326Sed if (TemplateKWLoc.isValid()) 850193326Sed Tok.setLocation(TemplateKWLoc); 851193326Sed else 852193326Sed Tok.setLocation(TemplateNameLoc); 853193326Sed 854193326Sed TemplateArgsPtr.release(); 855193326Sed } 856193326Sed 857193326Sed // Common fields for the annotation token 858193326Sed Tok.setAnnotationEndLoc(RAngleLoc); 859193326Sed 860193326Sed // In case the tokens were cached, have Preprocessor replace them with the 861193326Sed // annotation token. 862193326Sed PP.AnnotateCachedTokens(Tok); 863195099Sed return false; 864193326Sed} 865193326Sed 866193326Sed/// \brief Replaces a template-id annotation token with a type 867193326Sed/// annotation token. 868193326Sed/// 869193326Sed/// If there was a failure when forming the type from the template-id, 870193326Sed/// a type annotation token will still be created, but will have a 871193326Sed/// NULL type pointer to signify an error. 872221345Sdimvoid Parser::AnnotateTemplateIdTokenAsType() { 873193326Sed assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens"); 874193326Sed 875224145Sdim TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 876193326Sed assert((TemplateId->Kind == TNK_Type_template || 877193326Sed TemplateId->Kind == TNK_Dependent_template_name) && 878193326Sed "Only works for type and dependent templates"); 879198092Srdivacky 880198092Srdivacky ASTTemplateArgsPtr TemplateArgsPtr(Actions, 881193326Sed TemplateId->getTemplateArgs(), 882193326Sed TemplateId->NumArgs); 883193326Sed 884212904Sdim TypeResult Type 885221345Sdim = Actions.ActOnTemplateIdType(TemplateId->SS, 886221345Sdim TemplateId->Template, 887193326Sed TemplateId->TemplateNameLoc, 888198092Srdivacky TemplateId->LAngleLoc, 889193326Sed TemplateArgsPtr, 890193326Sed TemplateId->RAngleLoc); 891193326Sed // Create the new "type" annotation token. 892193326Sed Tok.setKind(tok::annot_typename); 893212904Sdim setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get()); 894221345Sdim if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name. 895221345Sdim Tok.setLocation(TemplateId->SS.getBeginLoc()); 896203955Srdivacky // End location stays the same 897193326Sed 898198954Srdivacky // Replace the template-id annotation token, and possible the scope-specifier 899198954Srdivacky // that precedes it, with the typename annotation token. 900198954Srdivacky PP.AnnotateCachedTokens(Tok); 901193326Sed} 902193326Sed 903199482Srdivacky/// \brief Determine whether the given token can end a template argument. 904199482Srdivackystatic bool isEndOfTemplateArgument(Token Tok) { 905199482Srdivacky return Tok.is(tok::comma) || Tok.is(tok::greater) || 906199482Srdivacky Tok.is(tok::greatergreater); 907199482Srdivacky} 908199482Srdivacky 909199482Srdivacky/// \brief Parse a C++ template template argument. 910199482SrdivackyParsedTemplateArgument Parser::ParseTemplateTemplateArgument() { 911199482Srdivacky if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) && 912199482Srdivacky !Tok.is(tok::annot_cxxscope)) 913199482Srdivacky return ParsedTemplateArgument(); 914199482Srdivacky 915199482Srdivacky // C++0x [temp.arg.template]p1: 916199482Srdivacky // A template-argument for a template template-parameter shall be the name 917223017Sdim // of a class template or an alias template, expressed as id-expression. 918199482Srdivacky // 919223017Sdim // We parse an id-expression that refers to a class template or alias 920223017Sdim // template. The grammar we parse is: 921199482Srdivacky // 922218893Sdim // nested-name-specifier[opt] template[opt] identifier ...[opt] 923199482Srdivacky // 924199482Srdivacky // followed by a token that terminates a template argument, such as ',', 925199482Srdivacky // '>', or (in some cases) '>>'. 926199482Srdivacky CXXScopeSpec SS; // nested-name-specifier, if present 927212904Sdim ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 928199482Srdivacky /*EnteringContext=*/false); 929199482Srdivacky 930218893Sdim ParsedTemplateArgument Result; 931218893Sdim SourceLocation EllipsisLoc; 932199482Srdivacky if (SS.isSet() && Tok.is(tok::kw_template)) { 933199482Srdivacky // Parse the optional 'template' keyword following the 934199482Srdivacky // nested-name-specifier. 935199482Srdivacky SourceLocation TemplateLoc = ConsumeToken(); 936199482Srdivacky 937199482Srdivacky if (Tok.is(tok::identifier)) { 938199482Srdivacky // We appear to have a dependent template name. 939199482Srdivacky UnqualifiedId Name; 940199482Srdivacky Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 941199482Srdivacky ConsumeToken(); // the identifier 942199482Srdivacky 943218893Sdim // Parse the ellipsis. 944218893Sdim if (Tok.is(tok::ellipsis)) 945218893Sdim EllipsisLoc = ConsumeToken(); 946218893Sdim 947199482Srdivacky // If the next token signals the end of a template argument, 948199482Srdivacky // then we have a dependent template name that could be a template 949199482Srdivacky // template argument. 950210299Sed TemplateTy Template; 951210299Sed if (isEndOfTemplateArgument(Tok) && 952212904Sdim Actions.ActOnDependentTemplateName(getCurScope(), TemplateLoc, 953212904Sdim SS, Name, 954212904Sdim /*ObjectType=*/ ParsedType(), 955210299Sed /*EnteringContext=*/false, 956210299Sed Template)) 957218893Sdim Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 958210299Sed } 959199482Srdivacky } else if (Tok.is(tok::identifier)) { 960199482Srdivacky // We may have a (non-dependent) template name. 961199482Srdivacky TemplateTy Template; 962199482Srdivacky UnqualifiedId Name; 963199482Srdivacky Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 964199482Srdivacky ConsumeToken(); // the identifier 965199482Srdivacky 966218893Sdim // Parse the ellipsis. 967218893Sdim if (Tok.is(tok::ellipsis)) 968218893Sdim EllipsisLoc = ConsumeToken(); 969218893Sdim 970199482Srdivacky if (isEndOfTemplateArgument(Tok)) { 971208600Srdivacky bool MemberOfUnknownSpecialization; 972212904Sdim TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 973212904Sdim /*hasTemplateKeyword=*/false, 974212904Sdim Name, 975212904Sdim /*ObjectType=*/ ParsedType(), 976199482Srdivacky /*EnteringContext=*/false, 977208600Srdivacky Template, 978208600Srdivacky MemberOfUnknownSpecialization); 979199482Srdivacky if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) { 980199482Srdivacky // We have an id-expression that refers to a class template or 981223017Sdim // (C++0x) alias template. 982218893Sdim Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 983199482Srdivacky } 984199482Srdivacky } 985199482Srdivacky } 986199482Srdivacky 987218893Sdim // If this is a pack expansion, build it as such. 988218893Sdim if (EllipsisLoc.isValid() && !Result.isInvalid()) 989218893Sdim Result = Actions.ActOnPackExpansion(Result, EllipsisLoc); 990218893Sdim 991218893Sdim return Result; 992199482Srdivacky} 993199482Srdivacky 994193326Sed/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]). 995193326Sed/// 996193326Sed/// template-argument: [C++ 14.2] 997194711Sed/// constant-expression 998193326Sed/// type-id 999193326Sed/// id-expression 1000199482SrdivackyParsedTemplateArgument Parser::ParseTemplateArgument() { 1001193326Sed // C++ [temp.arg]p2: 1002193326Sed // In a template-argument, an ambiguity between a type-id and an 1003193326Sed // expression is resolved to a type-id, regardless of the form of 1004193326Sed // the corresponding template-parameter. 1005193326Sed // 1006199482Srdivacky // Therefore, we initially try to parse a type-id. 1007193326Sed if (isCXXTypeId(TypeIdAsTemplateArgument)) { 1008199482Srdivacky SourceLocation Loc = Tok.getLocation(); 1009218893Sdim TypeResult TypeArg = ParseTypeName(/*Range=*/0, 1010218893Sdim Declarator::TemplateTypeArgContext); 1011193326Sed if (TypeArg.isInvalid()) 1012199482Srdivacky return ParsedTemplateArgument(); 1013199482Srdivacky 1014212904Sdim return ParsedTemplateArgument(ParsedTemplateArgument::Type, 1015212904Sdim TypeArg.get().getAsOpaquePtr(), 1016199482Srdivacky Loc); 1017193326Sed } 1018199482Srdivacky 1019199482Srdivacky // Try to parse a template template argument. 1020199482Srdivacky { 1021199482Srdivacky TentativeParsingAction TPA(*this); 1022193326Sed 1023199482Srdivacky ParsedTemplateArgument TemplateTemplateArgument 1024199482Srdivacky = ParseTemplateTemplateArgument(); 1025199482Srdivacky if (!TemplateTemplateArgument.isInvalid()) { 1026199482Srdivacky TPA.Commit(); 1027199482Srdivacky return TemplateTemplateArgument; 1028199482Srdivacky } 1029199482Srdivacky 1030199482Srdivacky // Revert this tentative parse to parse a non-type template argument. 1031199482Srdivacky TPA.Revert(); 1032199482Srdivacky } 1033199482Srdivacky 1034199482Srdivacky // Parse a non-type template argument. 1035199482Srdivacky SourceLocation Loc = Tok.getLocation(); 1036212904Sdim ExprResult ExprArg = ParseConstantExpression(); 1037193326Sed if (ExprArg.isInvalid() || !ExprArg.get()) 1038199482Srdivacky return ParsedTemplateArgument(); 1039193326Sed 1040199482Srdivacky return ParsedTemplateArgument(ParsedTemplateArgument::NonType, 1041199482Srdivacky ExprArg.release(), Loc); 1042193326Sed} 1043193326Sed 1044208600Srdivacky/// \brief Determine whether the current tokens can only be parsed as a 1045208600Srdivacky/// template argument list (starting with the '<') and never as a '<' 1046208600Srdivacky/// expression. 1047208600Srdivackybool Parser::IsTemplateArgumentList(unsigned Skip) { 1048208600Srdivacky struct AlwaysRevertAction : TentativeParsingAction { 1049208600Srdivacky AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { } 1050208600Srdivacky ~AlwaysRevertAction() { Revert(); } 1051208600Srdivacky } Tentative(*this); 1052208600Srdivacky 1053208600Srdivacky while (Skip) { 1054208600Srdivacky ConsumeToken(); 1055208600Srdivacky --Skip; 1056208600Srdivacky } 1057208600Srdivacky 1058208600Srdivacky // '<' 1059208600Srdivacky if (!Tok.is(tok::less)) 1060208600Srdivacky return false; 1061208600Srdivacky ConsumeToken(); 1062208600Srdivacky 1063208600Srdivacky // An empty template argument list. 1064208600Srdivacky if (Tok.is(tok::greater)) 1065208600Srdivacky return true; 1066208600Srdivacky 1067208600Srdivacky // See whether we have declaration specifiers, which indicate a type. 1068208600Srdivacky while (isCXXDeclarationSpecifier() == TPResult::True()) 1069208600Srdivacky ConsumeToken(); 1070208600Srdivacky 1071208600Srdivacky // If we have a '>' or a ',' then this is a template argument list. 1072208600Srdivacky return Tok.is(tok::greater) || Tok.is(tok::comma); 1073208600Srdivacky} 1074208600Srdivacky 1075193326Sed/// ParseTemplateArgumentList - Parse a C++ template-argument-list 1076193326Sed/// (C++ [temp.names]). Returns true if there was an error. 1077193326Sed/// 1078193326Sed/// template-argument-list: [C++ 14.2] 1079193326Sed/// template-argument 1080193326Sed/// template-argument-list ',' template-argument 1081198092Srdivackybool 1082199482SrdivackyParser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) { 1083193326Sed while (true) { 1084199482Srdivacky ParsedTemplateArgument Arg = ParseTemplateArgument(); 1085218893Sdim if (Tok.is(tok::ellipsis)) { 1086218893Sdim SourceLocation EllipsisLoc = ConsumeToken(); 1087218893Sdim Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc); 1088218893Sdim } 1089218893Sdim 1090199482Srdivacky if (Arg.isInvalid()) { 1091193326Sed SkipUntil(tok::comma, tok::greater, true, true); 1092193326Sed return true; 1093193326Sed } 1094193326Sed 1095199482Srdivacky // Save this template argument. 1096199482Srdivacky TemplateArgs.push_back(Arg); 1097199482Srdivacky 1098193326Sed // If the next token is a comma, consume it and keep reading 1099193326Sed // arguments. 1100193326Sed if (Tok.isNot(tok::comma)) break; 1101193326Sed 1102193326Sed // Consume the comma. 1103193326Sed ConsumeToken(); 1104193326Sed } 1105193326Sed 1106201361Srdivacky return false; 1107193326Sed} 1108193326Sed 1109198092Srdivacky/// \brief Parse a C++ explicit template instantiation 1110193326Sed/// (C++ [temp.explicit]). 1111193326Sed/// 1112193326Sed/// explicit-instantiation: 1113198092Srdivacky/// 'extern' [opt] 'template' declaration 1114198092Srdivacky/// 1115198092Srdivacky/// Note that the 'extern' is a GNU extension and C++0x feature. 1116212904SdimDecl *Parser::ParseExplicitInstantiation(SourceLocation ExternLoc, 1117212904Sdim SourceLocation TemplateLoc, 1118212904Sdim SourceLocation &DeclEnd) { 1119212904Sdim // This isn't really required here. 1120212904Sdim ParsingDeclRAIIObject ParsingTemplateParams(*this); 1121212904Sdim 1122198092Srdivacky return ParseSingleDeclarationAfterTemplate(Declarator::FileContext, 1123198092Srdivacky ParsedTemplateInfo(ExternLoc, 1124198092Srdivacky TemplateLoc), 1125212904Sdim ParsingTemplateParams, 1126193326Sed DeclEnd, AS_none); 1127193326Sed} 1128218893Sdim 1129218893SdimSourceRange Parser::ParsedTemplateInfo::getSourceRange() const { 1130218893Sdim if (TemplateParams) 1131218893Sdim return getTemplateParamsRange(TemplateParams->data(), 1132218893Sdim TemplateParams->size()); 1133218893Sdim 1134218893Sdim SourceRange R(TemplateLoc); 1135218893Sdim if (ExternLoc.isValid()) 1136218893Sdim R.setBegin(ExternLoc); 1137218893Sdim return R; 1138218893Sdim} 1139221345Sdim 1140221345Sdimvoid Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) { 1141221345Sdim ((Parser*)P)->LateTemplateParser(FD); 1142221345Sdim} 1143221345Sdim 1144221345Sdim 1145221345Sdimvoid Parser::LateTemplateParser(const FunctionDecl *FD) { 1146221345Sdim LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD]; 1147221345Sdim if (LPT) { 1148221345Sdim ParseLateTemplatedFuncDef(*LPT); 1149221345Sdim return; 1150221345Sdim } 1151221345Sdim 1152221345Sdim llvm_unreachable("Late templated function without associated lexed tokens"); 1153221345Sdim} 1154221345Sdim 1155221345Sdim/// \brief Late parse a C++ function template in Microsoft mode. 1156221345Sdimvoid Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) { 1157221345Sdim if(!LMT.D) 1158221345Sdim return; 1159221345Sdim 1160221345Sdim // If this is a member template, introduce the template parameter scope. 1161221345Sdim ParseScope TemplateScope(this, Scope::TemplateParamScope); 1162221345Sdim 1163221345Sdim // Get the FunctionDecl. 1164221345Sdim FunctionDecl *FD = 0; 1165221345Sdim if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D)) 1166221345Sdim FD = FunTmpl->getTemplatedDecl(); 1167221345Sdim else 1168221345Sdim FD = cast<FunctionDecl>(LMT.D); 1169221345Sdim 1170221345Sdim // Reinject the template parameters. 1171226890Sdim SmallVector<ParseScope*, 4> TemplateParamScopeStack; 1172221345Sdim DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD); 1173221345Sdim if (Declarator && Declarator->getNumTemplateParameterLists() != 0) { 1174221345Sdim Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator); 1175221345Sdim Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1176221345Sdim } else { 1177221345Sdim Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1178221345Sdim 1179226890Sdim // Get the list of DeclContext to reenter. 1180226890Sdim SmallVector<DeclContext*, 4> DeclContextToReenter; 1181221345Sdim DeclContext *DD = FD->getLexicalParent(); 1182221345Sdim while (DD && DD->isRecord()) { 1183226890Sdim DeclContextToReenter.push_back(DD); 1184221345Sdim DD = DD->getLexicalParent(); 1185221345Sdim } 1186226890Sdim 1187226890Sdim // Reenter template scopes from outmost to innermost. 1188226890Sdim SmallVector<DeclContext*, 4>::reverse_iterator II = 1189226890Sdim DeclContextToReenter.rbegin(); 1190226890Sdim for (; II != DeclContextToReenter.rend(); ++II) { 1191226890Sdim if (ClassTemplatePartialSpecializationDecl* MD = 1192226890Sdim dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) { 1193226890Sdim TemplateParamScopeStack.push_back(new ParseScope(this, 1194226890Sdim Scope::TemplateParamScope)); 1195226890Sdim Actions.ActOnReenterTemplateScope(getCurScope(), MD); 1196226890Sdim } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) { 1197226890Sdim TemplateParamScopeStack.push_back(new ParseScope(this, 1198226890Sdim Scope::TemplateParamScope, 1199226890Sdim MD->getDescribedClassTemplate() != 0 )); 1200226890Sdim Actions.ActOnReenterTemplateScope(getCurScope(), 1201226890Sdim MD->getDescribedClassTemplate()); 1202226890Sdim } 1203226890Sdim } 1204221345Sdim } 1205221345Sdim assert(!LMT.Toks.empty() && "Empty body!"); 1206221345Sdim 1207221345Sdim // Append the current token at the end of the new token stream so that it 1208221345Sdim // doesn't get lost. 1209221345Sdim LMT.Toks.push_back(Tok); 1210221345Sdim PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false); 1211221345Sdim 1212221345Sdim // Consume the previously pushed token. 1213221345Sdim ConsumeAnyToken(); 1214221345Sdim assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) 1215221345Sdim && "Inline method not starting with '{', ':' or 'try'"); 1216221345Sdim 1217221345Sdim // Parse the method body. Function body parsing code is similar enough 1218221345Sdim // to be re-used for method bodies as well. 1219221345Sdim ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope); 1220221345Sdim 1221221345Sdim // Recreate the DeclContext. 1222221345Sdim Sema::ContextRAII SavedContext(Actions, Actions.getContainingDC(FD)); 1223221345Sdim 1224221345Sdim if (FunctionTemplateDecl *FunctionTemplate 1225221345Sdim = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D)) 1226221345Sdim Actions.ActOnStartOfFunctionDef(getCurScope(), 1227221345Sdim FunctionTemplate->getTemplatedDecl()); 1228221345Sdim if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D)) 1229221345Sdim Actions.ActOnStartOfFunctionDef(getCurScope(), Function); 1230221345Sdim 1231221345Sdim 1232221345Sdim if (Tok.is(tok::kw_try)) { 1233221345Sdim ParseFunctionTryBlock(LMT.D, FnScope); 1234226890Sdim } else { 1235226890Sdim if (Tok.is(tok::colon)) 1236226890Sdim ParseConstructorInitializer(LMT.D); 1237226890Sdim else 1238226890Sdim Actions.ActOnDefaultCtorInitializers(LMT.D); 1239221345Sdim 1240226890Sdim if (Tok.is(tok::l_brace)) { 1241226890Sdim ParseFunctionStatementBody(LMT.D, FnScope); 1242226890Sdim Actions.MarkAsLateParsedTemplate(FD, false); 1243226890Sdim } else 1244221345Sdim Actions.ActOnFinishFunctionBody(LMT.D, 0); 1245226890Sdim } 1246221345Sdim 1247226890Sdim // Exit scopes. 1248226890Sdim FnScope.Exit(); 1249226890Sdim SmallVector<ParseScope*, 4>::reverse_iterator I = 1250226890Sdim TemplateParamScopeStack.rbegin(); 1251226890Sdim for (; I != TemplateParamScopeStack.rend(); ++I) 1252226890Sdim delete *I; 1253221345Sdim 1254221345Sdim DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D); 1255221345Sdim if (grp) 1256221345Sdim Actions.getASTConsumer().HandleTopLevelDecl(grp.get()); 1257221345Sdim} 1258221345Sdim 1259221345Sdim/// \brief Lex a delayed template function for late parsing. 1260221345Sdimvoid Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) { 1261221345Sdim tok::TokenKind kind = Tok.getKind(); 1262226890Sdim if (!ConsumeAndStoreFunctionPrologue(Toks)) { 1263226890Sdim // Consume everything up to (and including) the matching right brace. 1264226890Sdim ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1265221345Sdim } 1266221345Sdim 1267221345Sdim // If we're in a function-try-block, we need to store all the catch blocks. 1268221345Sdim if (kind == tok::kw_try) { 1269221345Sdim while (Tok.is(tok::kw_catch)) { 1270221345Sdim ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false); 1271221345Sdim ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1272221345Sdim } 1273221345Sdim } 1274221345Sdim} 1275