1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements parsing of C++ templates. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Parse/Parser.h" 15 #include "clang/Parse/ParseDiagnostic.h" 16 #include "clang/Sema/DeclSpec.h" 17 #include "clang/Sema/ParsedTemplate.h" 18 #include "clang/Sema/Scope.h" 19 #include "RAIIObjectsForParser.h" 20 #include "clang/AST/DeclTemplate.h" 21 #include "clang/AST/ASTConsumer.h" 22 using namespace clang; 23 24 /// \brief Parse a template declaration, explicit instantiation, or 25 /// explicit specialization. 26 Decl * 27 Parser::ParseDeclarationStartingWithTemplate(unsigned Context, 28 SourceLocation &DeclEnd, 29 AccessSpecifier AS, 30 AttributeList *AccessAttrs) { 31 ObjCDeclContextSwitch ObjCDC(*this); 32 33 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) { 34 return ParseExplicitInstantiation(Context, 35 SourceLocation(), ConsumeToken(), 36 DeclEnd, AS); 37 } 38 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS, 39 AccessAttrs); 40 } 41 42 /// \brief RAII class that manages the template parameter depth. 43 namespace { 44 class TemplateParameterDepthCounter { 45 unsigned &Depth; 46 unsigned AddedLevels; 47 48 public: 49 explicit TemplateParameterDepthCounter(unsigned &Depth) 50 : Depth(Depth), AddedLevels(0) { } 51 52 ~TemplateParameterDepthCounter() { 53 Depth -= AddedLevels; 54 } 55 56 void operator++() { 57 ++Depth; 58 ++AddedLevels; 59 } 60 61 operator unsigned() const { return Depth; } 62 }; 63 } 64 65 /// \brief Parse a template declaration or an explicit specialization. 66 /// 67 /// Template declarations include one or more template parameter lists 68 /// and either the function or class template declaration. Explicit 69 /// specializations contain one or more 'template < >' prefixes 70 /// followed by a (possibly templated) declaration. Since the 71 /// syntactic form of both features is nearly identical, we parse all 72 /// of the template headers together and let semantic analysis sort 73 /// the declarations from the explicit specializations. 74 /// 75 /// template-declaration: [C++ temp] 76 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration 77 /// 78 /// explicit-specialization: [ C++ temp.expl.spec] 79 /// 'template' '<' '>' declaration 80 Decl * 81 Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context, 82 SourceLocation &DeclEnd, 83 AccessSpecifier AS, 84 AttributeList *AccessAttrs) { 85 assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) && 86 "Token does not start a template declaration."); 87 88 // Enter template-parameter scope. 89 ParseScope TemplateParmScope(this, Scope::TemplateParamScope); 90 91 // Tell the action that names should be checked in the context of 92 // the declaration to come. 93 ParsingDeclRAIIObject ParsingTemplateParams(*this); 94 95 // Parse multiple levels of template headers within this template 96 // parameter scope, e.g., 97 // 98 // template<typename T> 99 // template<typename U> 100 // class A<T>::B { ... }; 101 // 102 // We parse multiple levels non-recursively so that we can build a 103 // single data structure containing all of the template parameter 104 // lists to easily differentiate between the case above and: 105 // 106 // template<typename T> 107 // class A { 108 // template<typename U> class B; 109 // }; 110 // 111 // In the first case, the action for declaring A<T>::B receives 112 // both template parameter lists. In the second case, the action for 113 // defining A<T>::B receives just the inner template parameter list 114 // (and retrieves the outer template parameter list from its 115 // context). 116 bool isSpecialization = true; 117 bool LastParamListWasEmpty = false; 118 TemplateParameterLists ParamLists; 119 TemplateParameterDepthCounter Depth(TemplateParameterDepth); 120 do { 121 // Consume the 'export', if any. 122 SourceLocation ExportLoc; 123 if (Tok.is(tok::kw_export)) { 124 ExportLoc = ConsumeToken(); 125 } 126 127 // Consume the 'template', which should be here. 128 SourceLocation TemplateLoc; 129 if (Tok.is(tok::kw_template)) { 130 TemplateLoc = ConsumeToken(); 131 } else { 132 Diag(Tok.getLocation(), diag::err_expected_template); 133 return 0; 134 } 135 136 // Parse the '<' template-parameter-list '>' 137 SourceLocation LAngleLoc, RAngleLoc; 138 SmallVector<Decl*, 4> TemplateParams; 139 if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc, 140 RAngleLoc)) { 141 // Skip until the semi-colon or a }. 142 SkipUntil(tok::r_brace, true, true); 143 if (Tok.is(tok::semi)) 144 ConsumeToken(); 145 return 0; 146 } 147 148 ParamLists.push_back( 149 Actions.ActOnTemplateParameterList(Depth, ExportLoc, 150 TemplateLoc, LAngleLoc, 151 TemplateParams.data(), 152 TemplateParams.size(), RAngleLoc)); 153 154 if (!TemplateParams.empty()) { 155 isSpecialization = false; 156 ++Depth; 157 } else { 158 LastParamListWasEmpty = true; 159 } 160 } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template)); 161 162 // Parse the actual template declaration. 163 return ParseSingleDeclarationAfterTemplate(Context, 164 ParsedTemplateInfo(&ParamLists, 165 isSpecialization, 166 LastParamListWasEmpty), 167 ParsingTemplateParams, 168 DeclEnd, AS, AccessAttrs); 169 } 170 171 /// \brief Parse a single declaration that declares a template, 172 /// template specialization, or explicit instantiation of a template. 173 /// 174 /// \param TemplateParams if non-NULL, the template parameter lists 175 /// that preceded this declaration. In this case, the declaration is a 176 /// template declaration, out-of-line definition of a template, or an 177 /// explicit template specialization. When NULL, the declaration is an 178 /// explicit template instantiation. 179 /// 180 /// \param TemplateLoc when TemplateParams is NULL, the location of 181 /// the 'template' keyword that indicates that we have an explicit 182 /// template instantiation. 183 /// 184 /// \param DeclEnd will receive the source location of the last token 185 /// within this declaration. 186 /// 187 /// \param AS the access specifier associated with this 188 /// declaration. Will be AS_none for namespace-scope declarations. 189 /// 190 /// \returns the new declaration. 191 Decl * 192 Parser::ParseSingleDeclarationAfterTemplate( 193 unsigned Context, 194 const ParsedTemplateInfo &TemplateInfo, 195 ParsingDeclRAIIObject &DiagsFromTParams, 196 SourceLocation &DeclEnd, 197 AccessSpecifier AS, 198 AttributeList *AccessAttrs) { 199 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && 200 "Template information required"); 201 202 if (Context == Declarator::MemberContext) { 203 // We are parsing a member template. 204 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo, 205 &DiagsFromTParams); 206 return 0; 207 } 208 209 ParsedAttributesWithRange prefixAttrs(AttrFactory); 210 MaybeParseCXX0XAttributes(prefixAttrs); 211 212 if (Tok.is(tok::kw_using)) 213 return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd, 214 prefixAttrs); 215 216 // Parse the declaration specifiers, stealing the accumulated 217 // diagnostics from the template parameters. 218 ParsingDeclSpec DS(*this, &DiagsFromTParams); 219 220 DS.takeAttributesFrom(prefixAttrs); 221 222 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, 223 getDeclSpecContextFromDeclaratorContext(Context)); 224 225 if (Tok.is(tok::semi)) { 226 DeclEnd = ConsumeToken(); 227 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 228 DS.complete(Decl); 229 return Decl; 230 } 231 232 // Parse the declarator. 233 ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context); 234 ParseDeclarator(DeclaratorInfo); 235 // Error parsing the declarator? 236 if (!DeclaratorInfo.hasName()) { 237 // If so, skip until the semi-colon or a }. 238 SkipUntil(tok::r_brace, true, true); 239 if (Tok.is(tok::semi)) 240 ConsumeToken(); 241 return 0; 242 } 243 244 LateParsedAttrList LateParsedAttrs; 245 if (DeclaratorInfo.isFunctionDeclarator()) 246 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 247 248 // If we have a declaration or declarator list, handle it. 249 if (isDeclarationAfterDeclarator()) { 250 // Parse this declaration. 251 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo, 252 TemplateInfo); 253 254 if (Tok.is(tok::comma)) { 255 Diag(Tok, diag::err_multiple_template_declarators) 256 << (int)TemplateInfo.Kind; 257 SkipUntil(tok::semi, true, false); 258 return ThisDecl; 259 } 260 261 // Eat the semi colon after the declaration. 262 ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration); 263 if (LateParsedAttrs.size() > 0) 264 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false); 265 DeclaratorInfo.complete(ThisDecl); 266 return ThisDecl; 267 } 268 269 if (DeclaratorInfo.isFunctionDeclarator() && 270 isStartOfFunctionDefinition(DeclaratorInfo)) { 271 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 272 // Recover by ignoring the 'typedef'. This was probably supposed to be 273 // the 'typename' keyword, which we should have already suggested adding 274 // if it's appropriate. 275 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef) 276 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 277 DS.ClearStorageClassSpecs(); 278 } 279 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo, 280 &LateParsedAttrs); 281 } 282 283 if (DeclaratorInfo.isFunctionDeclarator()) 284 Diag(Tok, diag::err_expected_fn_body); 285 else 286 Diag(Tok, diag::err_invalid_token_after_toplevel_declarator); 287 SkipUntil(tok::semi); 288 return 0; 289 } 290 291 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in 292 /// angle brackets. Depth is the depth of this template-parameter-list, which 293 /// is the number of template headers directly enclosing this template header. 294 /// TemplateParams is the current list of template parameters we're building. 295 /// The template parameter we parse will be added to this list. LAngleLoc and 296 /// RAngleLoc will receive the positions of the '<' and '>', respectively, 297 /// that enclose this template parameter list. 298 /// 299 /// \returns true if an error occurred, false otherwise. 300 bool Parser::ParseTemplateParameters(unsigned Depth, 301 SmallVectorImpl<Decl*> &TemplateParams, 302 SourceLocation &LAngleLoc, 303 SourceLocation &RAngleLoc) { 304 // Get the template parameter list. 305 if (!Tok.is(tok::less)) { 306 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template"; 307 return true; 308 } 309 LAngleLoc = ConsumeToken(); 310 311 // Try to parse the template parameter list. 312 bool Failed = false; 313 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) 314 Failed = ParseTemplateParameterList(Depth, TemplateParams); 315 316 if (Tok.is(tok::greatergreater)) { 317 Tok.setKind(tok::greater); 318 RAngleLoc = Tok.getLocation(); 319 Tok.setLocation(Tok.getLocation().getLocWithOffset(1)); 320 } else if (Tok.is(tok::greater)) 321 RAngleLoc = ConsumeToken(); 322 else if (Failed) { 323 Diag(Tok.getLocation(), diag::err_expected_greater); 324 return true; 325 } 326 return false; 327 } 328 329 /// ParseTemplateParameterList - Parse a template parameter list. If 330 /// the parsing fails badly (i.e., closing bracket was left out), this 331 /// will try to put the token stream in a reasonable position (closing 332 /// a statement, etc.) and return false. 333 /// 334 /// template-parameter-list: [C++ temp] 335 /// template-parameter 336 /// template-parameter-list ',' template-parameter 337 bool 338 Parser::ParseTemplateParameterList(unsigned Depth, 339 SmallVectorImpl<Decl*> &TemplateParams) { 340 while (1) { 341 if (Decl *TmpParam 342 = ParseTemplateParameter(Depth, TemplateParams.size())) { 343 TemplateParams.push_back(TmpParam); 344 } else { 345 // If we failed to parse a template parameter, skip until we find 346 // a comma or closing brace. 347 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 348 } 349 350 // Did we find a comma or the end of the template parmeter list? 351 if (Tok.is(tok::comma)) { 352 ConsumeToken(); 353 } else if (Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 354 // Don't consume this... that's done by template parser. 355 break; 356 } else { 357 // Somebody probably forgot to close the template. Skip ahead and 358 // try to get out of the expression. This error is currently 359 // subsumed by whatever goes on in ParseTemplateParameter. 360 Diag(Tok.getLocation(), diag::err_expected_comma_greater); 361 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 362 return false; 363 } 364 } 365 return true; 366 } 367 368 /// \brief Determine whether the parser is at the start of a template 369 /// type parameter. 370 bool Parser::isStartOfTemplateTypeParameter() { 371 if (Tok.is(tok::kw_class)) { 372 // "class" may be the start of an elaborated-type-specifier or a 373 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter. 374 switch (NextToken().getKind()) { 375 case tok::equal: 376 case tok::comma: 377 case tok::greater: 378 case tok::greatergreater: 379 case tok::ellipsis: 380 return true; 381 382 case tok::identifier: 383 // This may be either a type-parameter or an elaborated-type-specifier. 384 // We have to look further. 385 break; 386 387 default: 388 return false; 389 } 390 391 switch (GetLookAheadToken(2).getKind()) { 392 case tok::equal: 393 case tok::comma: 394 case tok::greater: 395 case tok::greatergreater: 396 return true; 397 398 default: 399 return false; 400 } 401 } 402 403 if (Tok.isNot(tok::kw_typename)) 404 return false; 405 406 // C++ [temp.param]p2: 407 // There is no semantic difference between class and typename in a 408 // template-parameter. typename followed by an unqualified-id 409 // names a template type parameter. typename followed by a 410 // qualified-id denotes the type in a non-type 411 // parameter-declaration. 412 Token Next = NextToken(); 413 414 // If we have an identifier, skip over it. 415 if (Next.getKind() == tok::identifier) 416 Next = GetLookAheadToken(2); 417 418 switch (Next.getKind()) { 419 case tok::equal: 420 case tok::comma: 421 case tok::greater: 422 case tok::greatergreater: 423 case tok::ellipsis: 424 return true; 425 426 default: 427 return false; 428 } 429 } 430 431 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]). 432 /// 433 /// template-parameter: [C++ temp.param] 434 /// type-parameter 435 /// parameter-declaration 436 /// 437 /// type-parameter: (see below) 438 /// 'class' ...[opt] identifier[opt] 439 /// 'class' identifier[opt] '=' type-id 440 /// 'typename' ...[opt] identifier[opt] 441 /// 'typename' identifier[opt] '=' type-id 442 /// 'template' '<' template-parameter-list '>' 443 /// 'class' ...[opt] identifier[opt] 444 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 445 /// = id-expression 446 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) { 447 if (isStartOfTemplateTypeParameter()) 448 return ParseTypeParameter(Depth, Position); 449 450 if (Tok.is(tok::kw_template)) 451 return ParseTemplateTemplateParameter(Depth, Position); 452 453 // If it's none of the above, then it must be a parameter declaration. 454 // NOTE: This will pick up errors in the closure of the template parameter 455 // list (e.g., template < ; Check here to implement >> style closures. 456 return ParseNonTypeTemplateParameter(Depth, Position); 457 } 458 459 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]). 460 /// Other kinds of template parameters are parsed in 461 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter. 462 /// 463 /// type-parameter: [C++ temp.param] 464 /// 'class' ...[opt][C++0x] identifier[opt] 465 /// 'class' identifier[opt] '=' type-id 466 /// 'typename' ...[opt][C++0x] identifier[opt] 467 /// 'typename' identifier[opt] '=' type-id 468 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) { 469 assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) && 470 "A type-parameter starts with 'class' or 'typename'"); 471 472 // Consume the 'class' or 'typename' keyword. 473 bool TypenameKeyword = Tok.is(tok::kw_typename); 474 SourceLocation KeyLoc = ConsumeToken(); 475 476 // Grab the ellipsis (if given). 477 bool Ellipsis = false; 478 SourceLocation EllipsisLoc; 479 if (Tok.is(tok::ellipsis)) { 480 Ellipsis = true; 481 EllipsisLoc = ConsumeToken(); 482 483 Diag(EllipsisLoc, 484 getLangOpts().CPlusPlus0x 485 ? diag::warn_cxx98_compat_variadic_templates 486 : diag::ext_variadic_templates); 487 } 488 489 // Grab the template parameter name (if given) 490 SourceLocation NameLoc; 491 IdentifierInfo* ParamName = 0; 492 if (Tok.is(tok::identifier)) { 493 ParamName = Tok.getIdentifierInfo(); 494 NameLoc = ConsumeToken(); 495 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || 496 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 497 // Unnamed template parameter. Don't have to do anything here, just 498 // don't consume this token. 499 } else { 500 Diag(Tok.getLocation(), diag::err_expected_ident); 501 return 0; 502 } 503 504 // Grab a default argument (if available). 505 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 506 // we introduce the type parameter into the local scope. 507 SourceLocation EqualLoc; 508 ParsedType DefaultArg; 509 if (Tok.is(tok::equal)) { 510 EqualLoc = ConsumeToken(); 511 DefaultArg = ParseTypeName(/*Range=*/0, 512 Declarator::TemplateTypeArgContext).get(); 513 } 514 515 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis, 516 EllipsisLoc, KeyLoc, ParamName, NameLoc, 517 Depth, Position, EqualLoc, DefaultArg); 518 } 519 520 /// ParseTemplateTemplateParameter - Handle the parsing of template 521 /// template parameters. 522 /// 523 /// type-parameter: [C++ temp.param] 524 /// 'template' '<' template-parameter-list '>' 'class' 525 /// ...[opt] identifier[opt] 526 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 527 /// = id-expression 528 Decl * 529 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) { 530 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword"); 531 532 // Handle the template <...> part. 533 SourceLocation TemplateLoc = ConsumeToken(); 534 SmallVector<Decl*,8> TemplateParams; 535 SourceLocation LAngleLoc, RAngleLoc; 536 { 537 ParseScope TemplateParmScope(this, Scope::TemplateParamScope); 538 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc, 539 RAngleLoc)) { 540 return 0; 541 } 542 } 543 544 // Generate a meaningful error if the user forgot to put class before the 545 // identifier, comma, or greater. Provide a fixit if the identifier, comma, 546 // or greater appear immediately or after 'typename' or 'struct'. In the 547 // latter case, replace the keyword with 'class'. 548 if (!Tok.is(tok::kw_class)) { 549 bool Replace = Tok.is(tok::kw_typename) || Tok.is(tok::kw_struct); 550 const Token& Next = Replace ? NextToken() : Tok; 551 if (Next.is(tok::identifier) || Next.is(tok::comma) || 552 Next.is(tok::greater) || Next.is(tok::greatergreater) || 553 Next.is(tok::ellipsis)) 554 Diag(Tok.getLocation(), diag::err_class_on_template_template_param) 555 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class") 556 : FixItHint::CreateInsertion(Tok.getLocation(), "class ")); 557 else 558 Diag(Tok.getLocation(), diag::err_class_on_template_template_param); 559 560 if (Replace) 561 ConsumeToken(); 562 } else 563 ConsumeToken(); 564 565 // Parse the ellipsis, if given. 566 SourceLocation EllipsisLoc; 567 if (Tok.is(tok::ellipsis)) { 568 EllipsisLoc = ConsumeToken(); 569 570 Diag(EllipsisLoc, 571 getLangOpts().CPlusPlus0x 572 ? diag::warn_cxx98_compat_variadic_templates 573 : diag::ext_variadic_templates); 574 } 575 576 // Get the identifier, if given. 577 SourceLocation NameLoc; 578 IdentifierInfo* ParamName = 0; 579 if (Tok.is(tok::identifier)) { 580 ParamName = Tok.getIdentifierInfo(); 581 NameLoc = ConsumeToken(); 582 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || 583 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 584 // Unnamed template parameter. Don't have to do anything here, just 585 // don't consume this token. 586 } else { 587 Diag(Tok.getLocation(), diag::err_expected_ident); 588 return 0; 589 } 590 591 TemplateParameterList *ParamList = 592 Actions.ActOnTemplateParameterList(Depth, SourceLocation(), 593 TemplateLoc, LAngleLoc, 594 TemplateParams.data(), 595 TemplateParams.size(), 596 RAngleLoc); 597 598 // Grab a default argument (if available). 599 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 600 // we introduce the template parameter into the local scope. 601 SourceLocation EqualLoc; 602 ParsedTemplateArgument DefaultArg; 603 if (Tok.is(tok::equal)) { 604 EqualLoc = ConsumeToken(); 605 DefaultArg = ParseTemplateTemplateArgument(); 606 if (DefaultArg.isInvalid()) { 607 Diag(Tok.getLocation(), 608 diag::err_default_template_template_parameter_not_template); 609 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 610 } 611 } 612 613 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc, 614 ParamList, EllipsisLoc, 615 ParamName, NameLoc, Depth, 616 Position, EqualLoc, DefaultArg); 617 } 618 619 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type 620 /// template parameters (e.g., in "template<int Size> class array;"). 621 /// 622 /// template-parameter: 623 /// ... 624 /// parameter-declaration 625 Decl * 626 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) { 627 // Parse the declaration-specifiers (i.e., the type). 628 // FIXME: The type should probably be restricted in some way... Not all 629 // declarators (parts of declarators?) are accepted for parameters. 630 DeclSpec DS(AttrFactory); 631 ParseDeclarationSpecifiers(DS); 632 633 // Parse this as a typename. 634 Declarator ParamDecl(DS, Declarator::TemplateParamContext); 635 ParseDeclarator(ParamDecl); 636 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 637 Diag(Tok.getLocation(), diag::err_expected_template_parameter); 638 return 0; 639 } 640 641 // If there is a default value, parse it. 642 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 643 // we introduce the template parameter into the local scope. 644 SourceLocation EqualLoc; 645 ExprResult DefaultArg; 646 if (Tok.is(tok::equal)) { 647 EqualLoc = ConsumeToken(); 648 649 // C++ [temp.param]p15: 650 // When parsing a default template-argument for a non-type 651 // template-parameter, the first non-nested > is taken as the 652 // end of the template-parameter-list rather than a greater-than 653 // operator. 654 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 655 656 DefaultArg = ParseAssignmentExpression(); 657 if (DefaultArg.isInvalid()) 658 SkipUntil(tok::comma, tok::greater, true, true); 659 } 660 661 // Create the parameter. 662 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl, 663 Depth, Position, EqualLoc, 664 DefaultArg.take()); 665 } 666 667 /// \brief Parses a template-id that after the template name has 668 /// already been parsed. 669 /// 670 /// This routine takes care of parsing the enclosed template argument 671 /// list ('<' template-parameter-list [opt] '>') and placing the 672 /// results into a form that can be transferred to semantic analysis. 673 /// 674 /// \param Template the template declaration produced by isTemplateName 675 /// 676 /// \param TemplateNameLoc the source location of the template name 677 /// 678 /// \param SS if non-NULL, the nested-name-specifier preceding the 679 /// template name. 680 /// 681 /// \param ConsumeLastToken if true, then we will consume the last 682 /// token that forms the template-id. Otherwise, we will leave the 683 /// last token in the stream (e.g., so that it can be replaced with an 684 /// annotation token). 685 bool 686 Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template, 687 SourceLocation TemplateNameLoc, 688 const CXXScopeSpec &SS, 689 bool ConsumeLastToken, 690 SourceLocation &LAngleLoc, 691 TemplateArgList &TemplateArgs, 692 SourceLocation &RAngleLoc) { 693 assert(Tok.is(tok::less) && "Must have already parsed the template-name"); 694 695 // Consume the '<'. 696 LAngleLoc = ConsumeToken(); 697 698 // Parse the optional template-argument-list. 699 bool Invalid = false; 700 { 701 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 702 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) 703 Invalid = ParseTemplateArgumentList(TemplateArgs); 704 705 if (Invalid) { 706 // Try to find the closing '>'. 707 SkipUntil(tok::greater, true, !ConsumeLastToken); 708 709 return true; 710 } 711 } 712 713 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) { 714 Diag(Tok.getLocation(), diag::err_expected_greater); 715 return true; 716 } 717 718 // Determine the location of the '>' or '>>'. Only consume this 719 // token if the caller asked us to. 720 RAngleLoc = Tok.getLocation(); 721 722 if (Tok.is(tok::greatergreater)) { 723 const char *ReplaceStr = "> >"; 724 if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater)) 725 ReplaceStr = "> > "; 726 727 Diag(Tok.getLocation(), getLangOpts().CPlusPlus0x ? 728 diag::warn_cxx98_compat_two_right_angle_brackets : 729 diag::err_two_right_angle_brackets_need_space) 730 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), 731 ReplaceStr); 732 733 Tok.setKind(tok::greater); 734 if (!ConsumeLastToken) { 735 // Since we're not supposed to consume the '>>' token, we need 736 // to insert a second '>' token after the first. 737 PP.EnterToken(Tok); 738 } 739 } else if (ConsumeLastToken) 740 ConsumeToken(); 741 742 return false; 743 } 744 745 /// \brief Replace the tokens that form a simple-template-id with an 746 /// annotation token containing the complete template-id. 747 /// 748 /// The first token in the stream must be the name of a template that 749 /// is followed by a '<'. This routine will parse the complete 750 /// simple-template-id and replace the tokens with a single annotation 751 /// token with one of two different kinds: if the template-id names a 752 /// type (and \p AllowTypeAnnotation is true), the annotation token is 753 /// a type annotation that includes the optional nested-name-specifier 754 /// (\p SS). Otherwise, the annotation token is a template-id 755 /// annotation that does not include the optional 756 /// nested-name-specifier. 757 /// 758 /// \param Template the declaration of the template named by the first 759 /// token (an identifier), as returned from \c Action::isTemplateName(). 760 /// 761 /// \param TemplateNameKind the kind of template that \p Template 762 /// refers to, as returned from \c Action::isTemplateName(). 763 /// 764 /// \param SS if non-NULL, the nested-name-specifier that precedes 765 /// this template name. 766 /// 767 /// \param TemplateKWLoc if valid, specifies that this template-id 768 /// annotation was preceded by the 'template' keyword and gives the 769 /// location of that keyword. If invalid (the default), then this 770 /// template-id was not preceded by a 'template' keyword. 771 /// 772 /// \param AllowTypeAnnotation if true (the default), then a 773 /// simple-template-id that refers to a class template, template 774 /// template parameter, or other template that produces a type will be 775 /// replaced with a type annotation token. Otherwise, the 776 /// simple-template-id is always replaced with a template-id 777 /// annotation token. 778 /// 779 /// If an unrecoverable parse error occurs and no annotation token can be 780 /// formed, this function returns true. 781 /// 782 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK, 783 CXXScopeSpec &SS, 784 SourceLocation TemplateKWLoc, 785 UnqualifiedId &TemplateName, 786 bool AllowTypeAnnotation) { 787 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++"); 788 assert(Template && Tok.is(tok::less) && 789 "Parser isn't at the beginning of a template-id"); 790 791 // Consume the template-name. 792 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin(); 793 794 // Parse the enclosed template argument list. 795 SourceLocation LAngleLoc, RAngleLoc; 796 TemplateArgList TemplateArgs; 797 bool Invalid = ParseTemplateIdAfterTemplateName(Template, 798 TemplateNameLoc, 799 SS, false, LAngleLoc, 800 TemplateArgs, 801 RAngleLoc); 802 803 if (Invalid) { 804 // If we failed to parse the template ID but skipped ahead to a >, we're not 805 // going to be able to form a token annotation. Eat the '>' if present. 806 if (Tok.is(tok::greater)) 807 ConsumeToken(); 808 return true; 809 } 810 811 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(), 812 TemplateArgs.size()); 813 814 // Build the annotation token. 815 if (TNK == TNK_Type_template && AllowTypeAnnotation) { 816 TypeResult Type 817 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc, 818 Template, TemplateNameLoc, 819 LAngleLoc, TemplateArgsPtr, RAngleLoc); 820 if (Type.isInvalid()) { 821 // If we failed to parse the template ID but skipped ahead to a >, we're not 822 // going to be able to form a token annotation. Eat the '>' if present. 823 if (Tok.is(tok::greater)) 824 ConsumeToken(); 825 return true; 826 } 827 828 Tok.setKind(tok::annot_typename); 829 setTypeAnnotation(Tok, Type.get()); 830 if (SS.isNotEmpty()) 831 Tok.setLocation(SS.getBeginLoc()); 832 else if (TemplateKWLoc.isValid()) 833 Tok.setLocation(TemplateKWLoc); 834 else 835 Tok.setLocation(TemplateNameLoc); 836 } else { 837 // Build a template-id annotation token that can be processed 838 // later. 839 Tok.setKind(tok::annot_template_id); 840 TemplateIdAnnotation *TemplateId 841 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds); 842 TemplateId->TemplateNameLoc = TemplateNameLoc; 843 if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) { 844 TemplateId->Name = TemplateName.Identifier; 845 TemplateId->Operator = OO_None; 846 } else { 847 TemplateId->Name = 0; 848 TemplateId->Operator = TemplateName.OperatorFunctionId.Operator; 849 } 850 TemplateId->SS = SS; 851 TemplateId->TemplateKWLoc = TemplateKWLoc; 852 TemplateId->Template = Template; 853 TemplateId->Kind = TNK; 854 TemplateId->LAngleLoc = LAngleLoc; 855 TemplateId->RAngleLoc = RAngleLoc; 856 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 857 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg) 858 Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]); 859 Tok.setAnnotationValue(TemplateId); 860 if (TemplateKWLoc.isValid()) 861 Tok.setLocation(TemplateKWLoc); 862 else 863 Tok.setLocation(TemplateNameLoc); 864 865 TemplateArgsPtr.release(); 866 } 867 868 // Common fields for the annotation token 869 Tok.setAnnotationEndLoc(RAngleLoc); 870 871 // In case the tokens were cached, have Preprocessor replace them with the 872 // annotation token. 873 PP.AnnotateCachedTokens(Tok); 874 return false; 875 } 876 877 /// \brief Replaces a template-id annotation token with a type 878 /// annotation token. 879 /// 880 /// If there was a failure when forming the type from the template-id, 881 /// a type annotation token will still be created, but will have a 882 /// NULL type pointer to signify an error. 883 void Parser::AnnotateTemplateIdTokenAsType() { 884 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens"); 885 886 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 887 assert((TemplateId->Kind == TNK_Type_template || 888 TemplateId->Kind == TNK_Dependent_template_name) && 889 "Only works for type and dependent templates"); 890 891 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 892 TemplateId->getTemplateArgs(), 893 TemplateId->NumArgs); 894 895 TypeResult Type 896 = Actions.ActOnTemplateIdType(TemplateId->SS, 897 TemplateId->TemplateKWLoc, 898 TemplateId->Template, 899 TemplateId->TemplateNameLoc, 900 TemplateId->LAngleLoc, 901 TemplateArgsPtr, 902 TemplateId->RAngleLoc); 903 // Create the new "type" annotation token. 904 Tok.setKind(tok::annot_typename); 905 setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get()); 906 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name. 907 Tok.setLocation(TemplateId->SS.getBeginLoc()); 908 // End location stays the same 909 910 // Replace the template-id annotation token, and possible the scope-specifier 911 // that precedes it, with the typename annotation token. 912 PP.AnnotateCachedTokens(Tok); 913 } 914 915 /// \brief Determine whether the given token can end a template argument. 916 static bool isEndOfTemplateArgument(Token Tok) { 917 return Tok.is(tok::comma) || Tok.is(tok::greater) || 918 Tok.is(tok::greatergreater); 919 } 920 921 /// \brief Parse a C++ template template argument. 922 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() { 923 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) && 924 !Tok.is(tok::annot_cxxscope)) 925 return ParsedTemplateArgument(); 926 927 // C++0x [temp.arg.template]p1: 928 // A template-argument for a template template-parameter shall be the name 929 // of a class template or an alias template, expressed as id-expression. 930 // 931 // We parse an id-expression that refers to a class template or alias 932 // template. The grammar we parse is: 933 // 934 // nested-name-specifier[opt] template[opt] identifier ...[opt] 935 // 936 // followed by a token that terminates a template argument, such as ',', 937 // '>', or (in some cases) '>>'. 938 CXXScopeSpec SS; // nested-name-specifier, if present 939 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 940 /*EnteringContext=*/false); 941 942 ParsedTemplateArgument Result; 943 SourceLocation EllipsisLoc; 944 if (SS.isSet() && Tok.is(tok::kw_template)) { 945 // Parse the optional 'template' keyword following the 946 // nested-name-specifier. 947 SourceLocation TemplateKWLoc = ConsumeToken(); 948 949 if (Tok.is(tok::identifier)) { 950 // We appear to have a dependent template name. 951 UnqualifiedId Name; 952 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 953 ConsumeToken(); // the identifier 954 955 // Parse the ellipsis. 956 if (Tok.is(tok::ellipsis)) 957 EllipsisLoc = ConsumeToken(); 958 959 // If the next token signals the end of a template argument, 960 // then we have a dependent template name that could be a template 961 // template argument. 962 TemplateTy Template; 963 if (isEndOfTemplateArgument(Tok) && 964 Actions.ActOnDependentTemplateName(getCurScope(), 965 SS, TemplateKWLoc, Name, 966 /*ObjectType=*/ ParsedType(), 967 /*EnteringContext=*/false, 968 Template)) 969 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 970 } 971 } else if (Tok.is(tok::identifier)) { 972 // We may have a (non-dependent) template name. 973 TemplateTy Template; 974 UnqualifiedId Name; 975 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 976 ConsumeToken(); // the identifier 977 978 // Parse the ellipsis. 979 if (Tok.is(tok::ellipsis)) 980 EllipsisLoc = ConsumeToken(); 981 982 if (isEndOfTemplateArgument(Tok)) { 983 bool MemberOfUnknownSpecialization; 984 TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 985 /*hasTemplateKeyword=*/false, 986 Name, 987 /*ObjectType=*/ ParsedType(), 988 /*EnteringContext=*/false, 989 Template, 990 MemberOfUnknownSpecialization); 991 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) { 992 // We have an id-expression that refers to a class template or 993 // (C++0x) alias template. 994 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 995 } 996 } 997 } 998 999 // If this is a pack expansion, build it as such. 1000 if (EllipsisLoc.isValid() && !Result.isInvalid()) 1001 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc); 1002 1003 return Result; 1004 } 1005 1006 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]). 1007 /// 1008 /// template-argument: [C++ 14.2] 1009 /// constant-expression 1010 /// type-id 1011 /// id-expression 1012 ParsedTemplateArgument Parser::ParseTemplateArgument() { 1013 // C++ [temp.arg]p2: 1014 // In a template-argument, an ambiguity between a type-id and an 1015 // expression is resolved to a type-id, regardless of the form of 1016 // the corresponding template-parameter. 1017 // 1018 // Therefore, we initially try to parse a type-id. 1019 if (isCXXTypeId(TypeIdAsTemplateArgument)) { 1020 SourceLocation Loc = Tok.getLocation(); 1021 TypeResult TypeArg = ParseTypeName(/*Range=*/0, 1022 Declarator::TemplateTypeArgContext); 1023 if (TypeArg.isInvalid()) 1024 return ParsedTemplateArgument(); 1025 1026 return ParsedTemplateArgument(ParsedTemplateArgument::Type, 1027 TypeArg.get().getAsOpaquePtr(), 1028 Loc); 1029 } 1030 1031 // Try to parse a template template argument. 1032 { 1033 TentativeParsingAction TPA(*this); 1034 1035 ParsedTemplateArgument TemplateTemplateArgument 1036 = ParseTemplateTemplateArgument(); 1037 if (!TemplateTemplateArgument.isInvalid()) { 1038 TPA.Commit(); 1039 return TemplateTemplateArgument; 1040 } 1041 1042 // Revert this tentative parse to parse a non-type template argument. 1043 TPA.Revert(); 1044 } 1045 1046 // Parse a non-type template argument. 1047 SourceLocation Loc = Tok.getLocation(); 1048 ExprResult ExprArg = ParseConstantExpression(MaybeTypeCast); 1049 if (ExprArg.isInvalid() || !ExprArg.get()) 1050 return ParsedTemplateArgument(); 1051 1052 return ParsedTemplateArgument(ParsedTemplateArgument::NonType, 1053 ExprArg.release(), Loc); 1054 } 1055 1056 /// \brief Determine whether the current tokens can only be parsed as a 1057 /// template argument list (starting with the '<') and never as a '<' 1058 /// expression. 1059 bool Parser::IsTemplateArgumentList(unsigned Skip) { 1060 struct AlwaysRevertAction : TentativeParsingAction { 1061 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { } 1062 ~AlwaysRevertAction() { Revert(); } 1063 } Tentative(*this); 1064 1065 while (Skip) { 1066 ConsumeToken(); 1067 --Skip; 1068 } 1069 1070 // '<' 1071 if (!Tok.is(tok::less)) 1072 return false; 1073 ConsumeToken(); 1074 1075 // An empty template argument list. 1076 if (Tok.is(tok::greater)) 1077 return true; 1078 1079 // See whether we have declaration specifiers, which indicate a type. 1080 while (isCXXDeclarationSpecifier() == TPResult::True()) 1081 ConsumeToken(); 1082 1083 // If we have a '>' or a ',' then this is a template argument list. 1084 return Tok.is(tok::greater) || Tok.is(tok::comma); 1085 } 1086 1087 /// ParseTemplateArgumentList - Parse a C++ template-argument-list 1088 /// (C++ [temp.names]). Returns true if there was an error. 1089 /// 1090 /// template-argument-list: [C++ 14.2] 1091 /// template-argument 1092 /// template-argument-list ',' template-argument 1093 bool 1094 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) { 1095 while (true) { 1096 ParsedTemplateArgument Arg = ParseTemplateArgument(); 1097 if (Tok.is(tok::ellipsis)) { 1098 SourceLocation EllipsisLoc = ConsumeToken(); 1099 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc); 1100 } 1101 1102 if (Arg.isInvalid()) { 1103 SkipUntil(tok::comma, tok::greater, true, true); 1104 return true; 1105 } 1106 1107 // Save this template argument. 1108 TemplateArgs.push_back(Arg); 1109 1110 // If the next token is a comma, consume it and keep reading 1111 // arguments. 1112 if (Tok.isNot(tok::comma)) break; 1113 1114 // Consume the comma. 1115 ConsumeToken(); 1116 } 1117 1118 return false; 1119 } 1120 1121 /// \brief Parse a C++ explicit template instantiation 1122 /// (C++ [temp.explicit]). 1123 /// 1124 /// explicit-instantiation: 1125 /// 'extern' [opt] 'template' declaration 1126 /// 1127 /// Note that the 'extern' is a GNU extension and C++0x feature. 1128 Decl *Parser::ParseExplicitInstantiation(unsigned Context, 1129 SourceLocation ExternLoc, 1130 SourceLocation TemplateLoc, 1131 SourceLocation &DeclEnd, 1132 AccessSpecifier AS) { 1133 // This isn't really required here. 1134 ParsingDeclRAIIObject ParsingTemplateParams(*this); 1135 1136 return ParseSingleDeclarationAfterTemplate(Context, 1137 ParsedTemplateInfo(ExternLoc, 1138 TemplateLoc), 1139 ParsingTemplateParams, 1140 DeclEnd, AS); 1141 } 1142 1143 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const { 1144 if (TemplateParams) 1145 return getTemplateParamsRange(TemplateParams->data(), 1146 TemplateParams->size()); 1147 1148 SourceRange R(TemplateLoc); 1149 if (ExternLoc.isValid()) 1150 R.setBegin(ExternLoc); 1151 return R; 1152 } 1153 1154 void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) { 1155 ((Parser*)P)->LateTemplateParser(FD); 1156 } 1157 1158 1159 void Parser::LateTemplateParser(const FunctionDecl *FD) { 1160 LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD]; 1161 if (LPT) { 1162 ParseLateTemplatedFuncDef(*LPT); 1163 return; 1164 } 1165 1166 llvm_unreachable("Late templated function without associated lexed tokens"); 1167 } 1168 1169 /// \brief Late parse a C++ function template in Microsoft mode. 1170 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) { 1171 if(!LMT.D) 1172 return; 1173 1174 // Get the FunctionDecl. 1175 FunctionDecl *FD = 0; 1176 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D)) 1177 FD = FunTmpl->getTemplatedDecl(); 1178 else 1179 FD = cast<FunctionDecl>(LMT.D); 1180 1181 // To restore the context after late parsing. 1182 Sema::ContextRAII GlobalSavedContext(Actions, Actions.CurContext); 1183 1184 SmallVector<ParseScope*, 4> TemplateParamScopeStack; 1185 DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD); 1186 if (Declarator && Declarator->getNumTemplateParameterLists() != 0) { 1187 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::TemplateParamScope)); 1188 Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator); 1189 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1190 } else { 1191 // Get the list of DeclContext to reenter. 1192 SmallVector<DeclContext*, 4> DeclContextToReenter; 1193 DeclContext *DD = FD->getLexicalParent(); 1194 while (DD && !DD->isTranslationUnit()) { 1195 DeclContextToReenter.push_back(DD); 1196 DD = DD->getLexicalParent(); 1197 } 1198 1199 // Reenter template scopes from outmost to innermost. 1200 SmallVector<DeclContext*, 4>::reverse_iterator II = 1201 DeclContextToReenter.rbegin(); 1202 for (; II != DeclContextToReenter.rend(); ++II) { 1203 if (ClassTemplatePartialSpecializationDecl* MD = 1204 dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) { 1205 TemplateParamScopeStack.push_back(new ParseScope(this, 1206 Scope::TemplateParamScope)); 1207 Actions.ActOnReenterTemplateScope(getCurScope(), MD); 1208 } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) { 1209 TemplateParamScopeStack.push_back(new ParseScope(this, 1210 Scope::TemplateParamScope, 1211 MD->getDescribedClassTemplate() != 0 )); 1212 Actions.ActOnReenterTemplateScope(getCurScope(), 1213 MD->getDescribedClassTemplate()); 1214 } 1215 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope)); 1216 Actions.PushDeclContext(Actions.getCurScope(), *II); 1217 } 1218 TemplateParamScopeStack.push_back(new ParseScope(this, 1219 Scope::TemplateParamScope)); 1220 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1221 } 1222 1223 assert(!LMT.Toks.empty() && "Empty body!"); 1224 1225 // Append the current token at the end of the new token stream so that it 1226 // doesn't get lost. 1227 LMT.Toks.push_back(Tok); 1228 PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false); 1229 1230 // Consume the previously pushed token. 1231 ConsumeAnyToken(); 1232 assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) 1233 && "Inline method not starting with '{', ':' or 'try'"); 1234 1235 // Parse the method body. Function body parsing code is similar enough 1236 // to be re-used for method bodies as well. 1237 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope); 1238 1239 // Recreate the containing function DeclContext. 1240 Sema::ContextRAII FunctionSavedContext(Actions, Actions.getContainingDC(FD)); 1241 1242 if (FunctionTemplateDecl *FunctionTemplate 1243 = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D)) 1244 Actions.ActOnStartOfFunctionDef(getCurScope(), 1245 FunctionTemplate->getTemplatedDecl()); 1246 if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D)) 1247 Actions.ActOnStartOfFunctionDef(getCurScope(), Function); 1248 1249 1250 if (Tok.is(tok::kw_try)) { 1251 ParseFunctionTryBlock(LMT.D, FnScope); 1252 } else { 1253 if (Tok.is(tok::colon)) 1254 ParseConstructorInitializer(LMT.D); 1255 else 1256 Actions.ActOnDefaultCtorInitializers(LMT.D); 1257 1258 if (Tok.is(tok::l_brace)) { 1259 ParseFunctionStatementBody(LMT.D, FnScope); 1260 Actions.MarkAsLateParsedTemplate(FD, false); 1261 } else 1262 Actions.ActOnFinishFunctionBody(LMT.D, 0); 1263 } 1264 1265 // Exit scopes. 1266 FnScope.Exit(); 1267 SmallVector<ParseScope*, 4>::reverse_iterator I = 1268 TemplateParamScopeStack.rbegin(); 1269 for (; I != TemplateParamScopeStack.rend(); ++I) 1270 delete *I; 1271 1272 DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D); 1273 if (grp) 1274 Actions.getASTConsumer().HandleTopLevelDecl(grp.get()); 1275 } 1276 1277 /// \brief Lex a delayed template function for late parsing. 1278 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) { 1279 tok::TokenKind kind = Tok.getKind(); 1280 if (!ConsumeAndStoreFunctionPrologue(Toks)) { 1281 // Consume everything up to (and including) the matching right brace. 1282 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1283 } 1284 1285 // If we're in a function-try-block, we need to store all the catch blocks. 1286 if (kind == tok::kw_try) { 1287 while (Tok.is(tok::kw_catch)) { 1288 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false); 1289 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1290 } 1291 } 1292 } 1293