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 "RAIIObjectsForParser.h" 16 #include "clang/AST/ASTConsumer.h" 17 #include "clang/AST/DeclTemplate.h" 18 #include "clang/Parse/ParseDiagnostic.h" 19 #include "clang/Sema/DeclSpec.h" 20 #include "clang/Sema/ParsedTemplate.h" 21 #include "clang/Sema/Scope.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 94 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent); 95 96 // Parse multiple levels of template headers within this template 97 // parameter scope, e.g., 98 // 99 // template<typename T> 100 // template<typename U> 101 // class A<T>::B { ... }; 102 // 103 // We parse multiple levels non-recursively so that we can build a 104 // single data structure containing all of the template parameter 105 // lists to easily differentiate between the case above and: 106 // 107 // template<typename T> 108 // class A { 109 // template<typename U> class B; 110 // }; 111 // 112 // In the first case, the action for declaring A<T>::B receives 113 // both template parameter lists. In the second case, the action for 114 // defining A<T>::B receives just the inner template parameter list 115 // (and retrieves the outer template parameter list from its 116 // context). 117 bool isSpecialization = true; 118 bool LastParamListWasEmpty = false; 119 TemplateParameterLists ParamLists; 120 TemplateParameterDepthCounter Depth(TemplateParameterDepth); 121 do { 122 // Consume the 'export', if any. 123 SourceLocation ExportLoc; 124 if (Tok.is(tok::kw_export)) { 125 ExportLoc = ConsumeToken(); 126 } 127 128 // Consume the 'template', which should be here. 129 SourceLocation TemplateLoc; 130 if (Tok.is(tok::kw_template)) { 131 TemplateLoc = ConsumeToken(); 132 } else { 133 Diag(Tok.getLocation(), diag::err_expected_template); 134 return 0; 135 } 136 137 // Parse the '<' template-parameter-list '>' 138 SourceLocation LAngleLoc, RAngleLoc; 139 SmallVector<Decl*, 4> TemplateParams; 140 if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc, 141 RAngleLoc)) { 142 // Skip until the semi-colon or a }. 143 SkipUntil(tok::r_brace, true, true); 144 if (Tok.is(tok::semi)) 145 ConsumeToken(); 146 return 0; 147 } 148 149 ParamLists.push_back( 150 Actions.ActOnTemplateParameterList(Depth, ExportLoc, 151 TemplateLoc, LAngleLoc, 152 TemplateParams.data(), 153 TemplateParams.size(), RAngleLoc)); 154 155 if (!TemplateParams.empty()) { 156 isSpecialization = false; 157 ++Depth; 158 } else { 159 LastParamListWasEmpty = true; 160 } 161 } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template)); 162 163 // Parse the actual template declaration. 164 return ParseSingleDeclarationAfterTemplate(Context, 165 ParsedTemplateInfo(&ParamLists, 166 isSpecialization, 167 LastParamListWasEmpty), 168 ParsingTemplateParams, 169 DeclEnd, AS, AccessAttrs); 170 } 171 172 /// \brief Parse a single declaration that declares a template, 173 /// template specialization, or explicit instantiation of a template. 174 /// 175 /// \param DeclEnd will receive the source location of the last token 176 /// within this declaration. 177 /// 178 /// \param AS the access specifier associated with this 179 /// declaration. Will be AS_none for namespace-scope declarations. 180 /// 181 /// \returns the new declaration. 182 Decl * 183 Parser::ParseSingleDeclarationAfterTemplate( 184 unsigned Context, 185 const ParsedTemplateInfo &TemplateInfo, 186 ParsingDeclRAIIObject &DiagsFromTParams, 187 SourceLocation &DeclEnd, 188 AccessSpecifier AS, 189 AttributeList *AccessAttrs) { 190 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && 191 "Template information required"); 192 193 if (Context == Declarator::MemberContext) { 194 // We are parsing a member template. 195 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo, 196 &DiagsFromTParams); 197 return 0; 198 } 199 200 ParsedAttributesWithRange prefixAttrs(AttrFactory); 201 MaybeParseCXX11Attributes(prefixAttrs); 202 203 if (Tok.is(tok::kw_using)) 204 return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd, 205 prefixAttrs); 206 207 // Parse the declaration specifiers, stealing any diagnostics from 208 // the template parameters. 209 ParsingDeclSpec DS(*this, &DiagsFromTParams); 210 211 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, 212 getDeclSpecContextFromDeclaratorContext(Context)); 213 214 if (Tok.is(tok::semi)) { 215 ProhibitAttributes(prefixAttrs); 216 DeclEnd = ConsumeToken(); 217 Decl *Decl = Actions.ParsedFreeStandingDeclSpec( 218 getCurScope(), AS, DS, 219 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams 220 : MultiTemplateParamsArg(), 221 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation); 222 DS.complete(Decl); 223 return Decl; 224 } 225 226 // Move the attributes from the prefix into the DS. 227 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) 228 ProhibitAttributes(prefixAttrs); 229 else 230 DS.takeAttributesFrom(prefixAttrs); 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(true); 245 if (DeclaratorInfo.isFunctionDeclarator()) 246 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs); 247 248 if (DeclaratorInfo.isFunctionDeclarator() && 249 isStartOfFunctionDefinition(DeclaratorInfo)) { 250 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 251 // Recover by ignoring the 'typedef'. This was probably supposed to be 252 // the 'typename' keyword, which we should have already suggested adding 253 // if it's appropriate. 254 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef) 255 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 256 DS.ClearStorageClassSpecs(); 257 } 258 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo, 259 &LateParsedAttrs); 260 } 261 262 // Parse this declaration. 263 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo, 264 TemplateInfo); 265 266 if (Tok.is(tok::comma)) { 267 Diag(Tok, diag::err_multiple_template_declarators) 268 << (int)TemplateInfo.Kind; 269 SkipUntil(tok::semi, true, false); 270 return ThisDecl; 271 } 272 273 // Eat the semi colon after the declaration. 274 ExpectAndConsumeSemi(diag::err_expected_semi_declaration); 275 if (LateParsedAttrs.size() > 0) 276 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false); 277 DeclaratorInfo.complete(ThisDecl); 278 return ThisDecl; 279 } 280 281 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in 282 /// angle brackets. Depth is the depth of this template-parameter-list, which 283 /// is the number of template headers directly enclosing this template header. 284 /// TemplateParams is the current list of template parameters we're building. 285 /// The template parameter we parse will be added to this list. LAngleLoc and 286 /// RAngleLoc will receive the positions of the '<' and '>', respectively, 287 /// that enclose this template parameter list. 288 /// 289 /// \returns true if an error occurred, false otherwise. 290 bool Parser::ParseTemplateParameters(unsigned Depth, 291 SmallVectorImpl<Decl*> &TemplateParams, 292 SourceLocation &LAngleLoc, 293 SourceLocation &RAngleLoc) { 294 // Get the template parameter list. 295 if (!Tok.is(tok::less)) { 296 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template"; 297 return true; 298 } 299 LAngleLoc = ConsumeToken(); 300 301 // Try to parse the template parameter list. 302 bool Failed = false; 303 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) 304 Failed = ParseTemplateParameterList(Depth, TemplateParams); 305 306 if (Tok.is(tok::greatergreater)) { 307 // No diagnostic required here: a template-parameter-list can only be 308 // followed by a declaration or, for a template template parameter, the 309 // 'class' keyword. Therefore, the second '>' will be diagnosed later. 310 // This matters for elegant diagnosis of: 311 // template<template<typename>> struct S; 312 Tok.setKind(tok::greater); 313 RAngleLoc = Tok.getLocation(); 314 Tok.setLocation(Tok.getLocation().getLocWithOffset(1)); 315 } else if (Tok.is(tok::greater)) 316 RAngleLoc = ConsumeToken(); 317 else if (Failed) { 318 Diag(Tok.getLocation(), diag::err_expected_greater); 319 return true; 320 } 321 return false; 322 } 323 324 /// ParseTemplateParameterList - Parse a template parameter list. If 325 /// the parsing fails badly (i.e., closing bracket was left out), this 326 /// will try to put the token stream in a reasonable position (closing 327 /// a statement, etc.) and return false. 328 /// 329 /// template-parameter-list: [C++ temp] 330 /// template-parameter 331 /// template-parameter-list ',' template-parameter 332 bool 333 Parser::ParseTemplateParameterList(unsigned Depth, 334 SmallVectorImpl<Decl*> &TemplateParams) { 335 while (1) { 336 if (Decl *TmpParam 337 = ParseTemplateParameter(Depth, TemplateParams.size())) { 338 TemplateParams.push_back(TmpParam); 339 } else { 340 // If we failed to parse a template parameter, skip until we find 341 // a comma or closing brace. 342 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 343 } 344 345 // Did we find a comma or the end of the template parameter list? 346 if (Tok.is(tok::comma)) { 347 ConsumeToken(); 348 } else if (Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 349 // Don't consume this... that's done by template parser. 350 break; 351 } else { 352 // Somebody probably forgot to close the template. Skip ahead and 353 // try to get out of the expression. This error is currently 354 // subsumed by whatever goes on in ParseTemplateParameter. 355 Diag(Tok.getLocation(), diag::err_expected_comma_greater); 356 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 357 return false; 358 } 359 } 360 return true; 361 } 362 363 /// \brief Determine whether the parser is at the start of a template 364 /// type parameter. 365 bool Parser::isStartOfTemplateTypeParameter() { 366 if (Tok.is(tok::kw_class)) { 367 // "class" may be the start of an elaborated-type-specifier or a 368 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter. 369 switch (NextToken().getKind()) { 370 case tok::equal: 371 case tok::comma: 372 case tok::greater: 373 case tok::greatergreater: 374 case tok::ellipsis: 375 return true; 376 377 case tok::identifier: 378 // This may be either a type-parameter or an elaborated-type-specifier. 379 // We have to look further. 380 break; 381 382 default: 383 return false; 384 } 385 386 switch (GetLookAheadToken(2).getKind()) { 387 case tok::equal: 388 case tok::comma: 389 case tok::greater: 390 case tok::greatergreater: 391 return true; 392 393 default: 394 return false; 395 } 396 } 397 398 if (Tok.isNot(tok::kw_typename)) 399 return false; 400 401 // C++ [temp.param]p2: 402 // There is no semantic difference between class and typename in a 403 // template-parameter. typename followed by an unqualified-id 404 // names a template type parameter. typename followed by a 405 // qualified-id denotes the type in a non-type 406 // parameter-declaration. 407 Token Next = NextToken(); 408 409 // If we have an identifier, skip over it. 410 if (Next.getKind() == tok::identifier) 411 Next = GetLookAheadToken(2); 412 413 switch (Next.getKind()) { 414 case tok::equal: 415 case tok::comma: 416 case tok::greater: 417 case tok::greatergreater: 418 case tok::ellipsis: 419 return true; 420 421 default: 422 return false; 423 } 424 } 425 426 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]). 427 /// 428 /// template-parameter: [C++ temp.param] 429 /// type-parameter 430 /// parameter-declaration 431 /// 432 /// type-parameter: (see below) 433 /// 'class' ...[opt] identifier[opt] 434 /// 'class' identifier[opt] '=' type-id 435 /// 'typename' ...[opt] identifier[opt] 436 /// 'typename' identifier[opt] '=' type-id 437 /// 'template' '<' template-parameter-list '>' 438 /// 'class' ...[opt] identifier[opt] 439 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 440 /// = id-expression 441 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) { 442 if (isStartOfTemplateTypeParameter()) 443 return ParseTypeParameter(Depth, Position); 444 445 if (Tok.is(tok::kw_template)) 446 return ParseTemplateTemplateParameter(Depth, Position); 447 448 // If it's none of the above, then it must be a parameter declaration. 449 // NOTE: This will pick up errors in the closure of the template parameter 450 // list (e.g., template < ; Check here to implement >> style closures. 451 return ParseNonTypeTemplateParameter(Depth, Position); 452 } 453 454 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]). 455 /// Other kinds of template parameters are parsed in 456 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter. 457 /// 458 /// type-parameter: [C++ temp.param] 459 /// 'class' ...[opt][C++0x] identifier[opt] 460 /// 'class' identifier[opt] '=' type-id 461 /// 'typename' ...[opt][C++0x] identifier[opt] 462 /// 'typename' identifier[opt] '=' type-id 463 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) { 464 assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) && 465 "A type-parameter starts with 'class' or 'typename'"); 466 467 // Consume the 'class' or 'typename' keyword. 468 bool TypenameKeyword = Tok.is(tok::kw_typename); 469 SourceLocation KeyLoc = ConsumeToken(); 470 471 // Grab the ellipsis (if given). 472 bool Ellipsis = false; 473 SourceLocation EllipsisLoc; 474 if (Tok.is(tok::ellipsis)) { 475 Ellipsis = true; 476 EllipsisLoc = ConsumeToken(); 477 478 Diag(EllipsisLoc, 479 getLangOpts().CPlusPlus11 480 ? diag::warn_cxx98_compat_variadic_templates 481 : diag::ext_variadic_templates); 482 } 483 484 // Grab the template parameter name (if given) 485 SourceLocation NameLoc; 486 IdentifierInfo* ParamName = 0; 487 if (Tok.is(tok::identifier)) { 488 ParamName = Tok.getIdentifierInfo(); 489 NameLoc = ConsumeToken(); 490 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || 491 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 492 // Unnamed template parameter. Don't have to do anything here, just 493 // don't consume this token. 494 } else { 495 Diag(Tok.getLocation(), diag::err_expected_ident); 496 return 0; 497 } 498 499 // Grab a default argument (if available). 500 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 501 // we introduce the type parameter into the local scope. 502 SourceLocation EqualLoc; 503 ParsedType DefaultArg; 504 if (Tok.is(tok::equal)) { 505 EqualLoc = ConsumeToken(); 506 DefaultArg = ParseTypeName(/*Range=*/0, 507 Declarator::TemplateTypeArgContext).get(); 508 } 509 510 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, Ellipsis, 511 EllipsisLoc, KeyLoc, ParamName, NameLoc, 512 Depth, Position, EqualLoc, DefaultArg); 513 } 514 515 /// ParseTemplateTemplateParameter - Handle the parsing of template 516 /// template parameters. 517 /// 518 /// type-parameter: [C++ temp.param] 519 /// 'template' '<' template-parameter-list '>' 'class' 520 /// ...[opt] identifier[opt] 521 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] 522 /// = id-expression 523 Decl * 524 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) { 525 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword"); 526 527 // Handle the template <...> part. 528 SourceLocation TemplateLoc = ConsumeToken(); 529 SmallVector<Decl*,8> TemplateParams; 530 SourceLocation LAngleLoc, RAngleLoc; 531 { 532 ParseScope TemplateParmScope(this, Scope::TemplateParamScope); 533 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc, 534 RAngleLoc)) { 535 return 0; 536 } 537 } 538 539 // Generate a meaningful error if the user forgot to put class before the 540 // identifier, comma, or greater. Provide a fixit if the identifier, comma, 541 // or greater appear immediately or after 'typename' or 'struct'. In the 542 // latter case, replace the keyword with 'class'. 543 if (!Tok.is(tok::kw_class)) { 544 bool Replace = Tok.is(tok::kw_typename) || Tok.is(tok::kw_struct); 545 const Token& Next = Replace ? NextToken() : Tok; 546 if (Next.is(tok::identifier) || Next.is(tok::comma) || 547 Next.is(tok::greater) || Next.is(tok::greatergreater) || 548 Next.is(tok::ellipsis)) 549 Diag(Tok.getLocation(), diag::err_class_on_template_template_param) 550 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class") 551 : FixItHint::CreateInsertion(Tok.getLocation(), "class ")); 552 else 553 Diag(Tok.getLocation(), diag::err_class_on_template_template_param); 554 555 if (Replace) 556 ConsumeToken(); 557 } else 558 ConsumeToken(); 559 560 // Parse the ellipsis, if given. 561 SourceLocation EllipsisLoc; 562 if (Tok.is(tok::ellipsis)) { 563 EllipsisLoc = ConsumeToken(); 564 565 Diag(EllipsisLoc, 566 getLangOpts().CPlusPlus11 567 ? diag::warn_cxx98_compat_variadic_templates 568 : diag::ext_variadic_templates); 569 } 570 571 // Get the identifier, if given. 572 SourceLocation NameLoc; 573 IdentifierInfo* ParamName = 0; 574 if (Tok.is(tok::identifier)) { 575 ParamName = Tok.getIdentifierInfo(); 576 NameLoc = ConsumeToken(); 577 } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || 578 Tok.is(tok::greater) || Tok.is(tok::greatergreater)) { 579 // Unnamed template parameter. Don't have to do anything here, just 580 // don't consume this token. 581 } else { 582 Diag(Tok.getLocation(), diag::err_expected_ident); 583 return 0; 584 } 585 586 TemplateParameterList *ParamList = 587 Actions.ActOnTemplateParameterList(Depth, SourceLocation(), 588 TemplateLoc, LAngleLoc, 589 TemplateParams.data(), 590 TemplateParams.size(), 591 RAngleLoc); 592 593 // Grab a default argument (if available). 594 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 595 // we introduce the template parameter into the local scope. 596 SourceLocation EqualLoc; 597 ParsedTemplateArgument DefaultArg; 598 if (Tok.is(tok::equal)) { 599 EqualLoc = ConsumeToken(); 600 DefaultArg = ParseTemplateTemplateArgument(); 601 if (DefaultArg.isInvalid()) { 602 Diag(Tok.getLocation(), 603 diag::err_default_template_template_parameter_not_template); 604 SkipUntil(tok::comma, tok::greater, tok::greatergreater, true, true); 605 } 606 } 607 608 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc, 609 ParamList, EllipsisLoc, 610 ParamName, NameLoc, Depth, 611 Position, EqualLoc, DefaultArg); 612 } 613 614 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type 615 /// template parameters (e.g., in "template<int Size> class array;"). 616 /// 617 /// template-parameter: 618 /// ... 619 /// parameter-declaration 620 Decl * 621 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) { 622 // Parse the declaration-specifiers (i.e., the type). 623 // FIXME: The type should probably be restricted in some way... Not all 624 // declarators (parts of declarators?) are accepted for parameters. 625 DeclSpec DS(AttrFactory); 626 ParseDeclarationSpecifiers(DS); 627 628 // Parse this as a typename. 629 Declarator ParamDecl(DS, Declarator::TemplateParamContext); 630 ParseDeclarator(ParamDecl); 631 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 632 Diag(Tok.getLocation(), diag::err_expected_template_parameter); 633 return 0; 634 } 635 636 // If there is a default value, parse it. 637 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before 638 // we introduce the template parameter into the local scope. 639 SourceLocation EqualLoc; 640 ExprResult DefaultArg; 641 if (Tok.is(tok::equal)) { 642 EqualLoc = ConsumeToken(); 643 644 // C++ [temp.param]p15: 645 // When parsing a default template-argument for a non-type 646 // template-parameter, the first non-nested > is taken as the 647 // end of the template-parameter-list rather than a greater-than 648 // operator. 649 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 650 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 651 652 DefaultArg = ParseAssignmentExpression(); 653 if (DefaultArg.isInvalid()) 654 SkipUntil(tok::comma, tok::greater, true, true); 655 } 656 657 // Create the parameter. 658 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl, 659 Depth, Position, EqualLoc, 660 DefaultArg.take()); 661 } 662 663 /// \brief Parses a '>' at the end of a template list. 664 /// 665 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries 666 /// to determine if these tokens were supposed to be a '>' followed by 667 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary. 668 /// 669 /// \param RAngleLoc the location of the consumed '>'. 670 /// 671 /// \param ConsumeLastToken if true, the '>' is not consumed. 672 bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc, 673 bool ConsumeLastToken) { 674 // What will be left once we've consumed the '>'. 675 tok::TokenKind RemainingToken; 676 const char *ReplacementStr = "> >"; 677 678 switch (Tok.getKind()) { 679 default: 680 Diag(Tok.getLocation(), diag::err_expected_greater); 681 return true; 682 683 case tok::greater: 684 // Determine the location of the '>' token. Only consume this token 685 // if the caller asked us to. 686 RAngleLoc = Tok.getLocation(); 687 if (ConsumeLastToken) 688 ConsumeToken(); 689 return false; 690 691 case tok::greatergreater: 692 RemainingToken = tok::greater; 693 break; 694 695 case tok::greatergreatergreater: 696 RemainingToken = tok::greatergreater; 697 break; 698 699 case tok::greaterequal: 700 RemainingToken = tok::equal; 701 ReplacementStr = "> ="; 702 break; 703 704 case tok::greatergreaterequal: 705 RemainingToken = tok::greaterequal; 706 break; 707 } 708 709 // This template-id is terminated by a token which starts with a '>'. Outside 710 // C++11, this is now error recovery, and in C++11, this is error recovery if 711 // the token isn't '>>'. 712 713 RAngleLoc = Tok.getLocation(); 714 715 // The source range of the '>>' or '>=' at the start of the token. 716 CharSourceRange ReplacementRange = 717 CharSourceRange::getCharRange(RAngleLoc, 718 Lexer::AdvanceToTokenCharacter(RAngleLoc, 2, PP.getSourceManager(), 719 getLangOpts())); 720 721 // A hint to put a space between the '>>'s. In order to make the hint as 722 // clear as possible, we include the characters either side of the space in 723 // the replacement, rather than just inserting a space at SecondCharLoc. 724 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange, 725 ReplacementStr); 726 727 // A hint to put another space after the token, if it would otherwise be 728 // lexed differently. 729 FixItHint Hint2; 730 Token Next = NextToken(); 731 if ((RemainingToken == tok::greater || 732 RemainingToken == tok::greatergreater) && 733 (Next.is(tok::greater) || Next.is(tok::greatergreater) || 734 Next.is(tok::greatergreatergreater) || Next.is(tok::equal) || 735 Next.is(tok::greaterequal) || Next.is(tok::greatergreaterequal) || 736 Next.is(tok::equalequal)) && 737 areTokensAdjacent(Tok, Next)) 738 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " "); 739 740 unsigned DiagId = diag::err_two_right_angle_brackets_need_space; 741 if (getLangOpts().CPlusPlus11 && Tok.is(tok::greatergreater)) 742 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets; 743 else if (Tok.is(tok::greaterequal)) 744 DiagId = diag::err_right_angle_bracket_equal_needs_space; 745 Diag(Tok.getLocation(), DiagId) << Hint1 << Hint2; 746 747 // Strip the initial '>' from the token. 748 if (RemainingToken == tok::equal && Next.is(tok::equal) && 749 areTokensAdjacent(Tok, Next)) { 750 // Join two adjacent '=' tokens into one, for cases like: 751 // void (*p)() = f<int>; 752 // return f<int>==p; 753 ConsumeToken(); 754 Tok.setKind(tok::equalequal); 755 Tok.setLength(Tok.getLength() + 1); 756 } else { 757 Tok.setKind(RemainingToken); 758 Tok.setLength(Tok.getLength() - 1); 759 } 760 Tok.setLocation(Lexer::AdvanceToTokenCharacter(RAngleLoc, 1, 761 PP.getSourceManager(), 762 getLangOpts())); 763 764 if (!ConsumeLastToken) { 765 // Since we're not supposed to consume the '>' token, we need to push 766 // this token and revert the current token back to the '>'. 767 PP.EnterToken(Tok); 768 Tok.setKind(tok::greater); 769 Tok.setLength(1); 770 Tok.setLocation(RAngleLoc); 771 } 772 return false; 773 } 774 775 776 /// \brief Parses a template-id that after the template name has 777 /// already been parsed. 778 /// 779 /// This routine takes care of parsing the enclosed template argument 780 /// list ('<' template-parameter-list [opt] '>') and placing the 781 /// results into a form that can be transferred to semantic analysis. 782 /// 783 /// \param Template the template declaration produced by isTemplateName 784 /// 785 /// \param TemplateNameLoc the source location of the template name 786 /// 787 /// \param SS if non-NULL, the nested-name-specifier preceding the 788 /// template name. 789 /// 790 /// \param ConsumeLastToken if true, then we will consume the last 791 /// token that forms the template-id. Otherwise, we will leave the 792 /// last token in the stream (e.g., so that it can be replaced with an 793 /// annotation token). 794 bool 795 Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template, 796 SourceLocation TemplateNameLoc, 797 const CXXScopeSpec &SS, 798 bool ConsumeLastToken, 799 SourceLocation &LAngleLoc, 800 TemplateArgList &TemplateArgs, 801 SourceLocation &RAngleLoc) { 802 assert(Tok.is(tok::less) && "Must have already parsed the template-name"); 803 804 // Consume the '<'. 805 LAngleLoc = ConsumeToken(); 806 807 // Parse the optional template-argument-list. 808 bool Invalid = false; 809 { 810 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false); 811 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) 812 Invalid = ParseTemplateArgumentList(TemplateArgs); 813 814 if (Invalid) { 815 // Try to find the closing '>'. 816 SkipUntil(tok::greater, true, !ConsumeLastToken); 817 818 return true; 819 } 820 } 821 822 return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken); 823 } 824 825 /// \brief Replace the tokens that form a simple-template-id with an 826 /// annotation token containing the complete template-id. 827 /// 828 /// The first token in the stream must be the name of a template that 829 /// is followed by a '<'. This routine will parse the complete 830 /// simple-template-id and replace the tokens with a single annotation 831 /// token with one of two different kinds: if the template-id names a 832 /// type (and \p AllowTypeAnnotation is true), the annotation token is 833 /// a type annotation that includes the optional nested-name-specifier 834 /// (\p SS). Otherwise, the annotation token is a template-id 835 /// annotation that does not include the optional 836 /// nested-name-specifier. 837 /// 838 /// \param Template the declaration of the template named by the first 839 /// token (an identifier), as returned from \c Action::isTemplateName(). 840 /// 841 /// \param TNK the kind of template that \p Template 842 /// refers to, as returned from \c Action::isTemplateName(). 843 /// 844 /// \param SS if non-NULL, the nested-name-specifier that precedes 845 /// this template name. 846 /// 847 /// \param TemplateKWLoc if valid, specifies that this template-id 848 /// annotation was preceded by the 'template' keyword and gives the 849 /// location of that keyword. If invalid (the default), then this 850 /// template-id was not preceded by a 'template' keyword. 851 /// 852 /// \param AllowTypeAnnotation if true (the default), then a 853 /// simple-template-id that refers to a class template, template 854 /// template parameter, or other template that produces a type will be 855 /// replaced with a type annotation token. Otherwise, the 856 /// simple-template-id is always replaced with a template-id 857 /// annotation token. 858 /// 859 /// If an unrecoverable parse error occurs and no annotation token can be 860 /// formed, this function returns true. 861 /// 862 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK, 863 CXXScopeSpec &SS, 864 SourceLocation TemplateKWLoc, 865 UnqualifiedId &TemplateName, 866 bool AllowTypeAnnotation) { 867 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++"); 868 assert(Template && Tok.is(tok::less) && 869 "Parser isn't at the beginning of a template-id"); 870 871 // Consume the template-name. 872 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin(); 873 874 // Parse the enclosed template argument list. 875 SourceLocation LAngleLoc, RAngleLoc; 876 TemplateArgList TemplateArgs; 877 bool Invalid = ParseTemplateIdAfterTemplateName(Template, 878 TemplateNameLoc, 879 SS, false, LAngleLoc, 880 TemplateArgs, 881 RAngleLoc); 882 883 if (Invalid) { 884 // If we failed to parse the template ID but skipped ahead to a >, we're not 885 // going to be able to form a token annotation. Eat the '>' if present. 886 if (Tok.is(tok::greater)) 887 ConsumeToken(); 888 return true; 889 } 890 891 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs); 892 893 // Build the annotation token. 894 if (TNK == TNK_Type_template && AllowTypeAnnotation) { 895 TypeResult Type 896 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc, 897 Template, TemplateNameLoc, 898 LAngleLoc, TemplateArgsPtr, RAngleLoc); 899 if (Type.isInvalid()) { 900 // If we failed to parse the template ID but skipped ahead to a >, we're not 901 // going to be able to form a token annotation. Eat the '>' if present. 902 if (Tok.is(tok::greater)) 903 ConsumeToken(); 904 return true; 905 } 906 907 Tok.setKind(tok::annot_typename); 908 setTypeAnnotation(Tok, Type.get()); 909 if (SS.isNotEmpty()) 910 Tok.setLocation(SS.getBeginLoc()); 911 else if (TemplateKWLoc.isValid()) 912 Tok.setLocation(TemplateKWLoc); 913 else 914 Tok.setLocation(TemplateNameLoc); 915 } else { 916 // Build a template-id annotation token that can be processed 917 // later. 918 Tok.setKind(tok::annot_template_id); 919 TemplateIdAnnotation *TemplateId 920 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds); 921 TemplateId->TemplateNameLoc = TemplateNameLoc; 922 if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) { 923 TemplateId->Name = TemplateName.Identifier; 924 TemplateId->Operator = OO_None; 925 } else { 926 TemplateId->Name = 0; 927 TemplateId->Operator = TemplateName.OperatorFunctionId.Operator; 928 } 929 TemplateId->SS = SS; 930 TemplateId->TemplateKWLoc = TemplateKWLoc; 931 TemplateId->Template = Template; 932 TemplateId->Kind = TNK; 933 TemplateId->LAngleLoc = LAngleLoc; 934 TemplateId->RAngleLoc = RAngleLoc; 935 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 936 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg) 937 Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]); 938 Tok.setAnnotationValue(TemplateId); 939 if (TemplateKWLoc.isValid()) 940 Tok.setLocation(TemplateKWLoc); 941 else 942 Tok.setLocation(TemplateNameLoc); 943 } 944 945 // Common fields for the annotation token 946 Tok.setAnnotationEndLoc(RAngleLoc); 947 948 // In case the tokens were cached, have Preprocessor replace them with the 949 // annotation token. 950 PP.AnnotateCachedTokens(Tok); 951 return false; 952 } 953 954 /// \brief Replaces a template-id annotation token with a type 955 /// annotation token. 956 /// 957 /// If there was a failure when forming the type from the template-id, 958 /// a type annotation token will still be created, but will have a 959 /// NULL type pointer to signify an error. 960 void Parser::AnnotateTemplateIdTokenAsType() { 961 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens"); 962 963 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 964 assert((TemplateId->Kind == TNK_Type_template || 965 TemplateId->Kind == TNK_Dependent_template_name) && 966 "Only works for type and dependent templates"); 967 968 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(), 969 TemplateId->NumArgs); 970 971 TypeResult Type 972 = Actions.ActOnTemplateIdType(TemplateId->SS, 973 TemplateId->TemplateKWLoc, 974 TemplateId->Template, 975 TemplateId->TemplateNameLoc, 976 TemplateId->LAngleLoc, 977 TemplateArgsPtr, 978 TemplateId->RAngleLoc); 979 // Create the new "type" annotation token. 980 Tok.setKind(tok::annot_typename); 981 setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get()); 982 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name. 983 Tok.setLocation(TemplateId->SS.getBeginLoc()); 984 // End location stays the same 985 986 // Replace the template-id annotation token, and possible the scope-specifier 987 // that precedes it, with the typename annotation token. 988 PP.AnnotateCachedTokens(Tok); 989 } 990 991 /// \brief Determine whether the given token can end a template argument. 992 static bool isEndOfTemplateArgument(Token Tok) { 993 return Tok.is(tok::comma) || Tok.is(tok::greater) || 994 Tok.is(tok::greatergreater); 995 } 996 997 /// \brief Parse a C++ template template argument. 998 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() { 999 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) && 1000 !Tok.is(tok::annot_cxxscope)) 1001 return ParsedTemplateArgument(); 1002 1003 // C++0x [temp.arg.template]p1: 1004 // A template-argument for a template template-parameter shall be the name 1005 // of a class template or an alias template, expressed as id-expression. 1006 // 1007 // We parse an id-expression that refers to a class template or alias 1008 // template. The grammar we parse is: 1009 // 1010 // nested-name-specifier[opt] template[opt] identifier ...[opt] 1011 // 1012 // followed by a token that terminates a template argument, such as ',', 1013 // '>', or (in some cases) '>>'. 1014 CXXScopeSpec SS; // nested-name-specifier, if present 1015 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1016 /*EnteringContext=*/false); 1017 1018 ParsedTemplateArgument Result; 1019 SourceLocation EllipsisLoc; 1020 if (SS.isSet() && Tok.is(tok::kw_template)) { 1021 // Parse the optional 'template' keyword following the 1022 // nested-name-specifier. 1023 SourceLocation TemplateKWLoc = ConsumeToken(); 1024 1025 if (Tok.is(tok::identifier)) { 1026 // We appear to have a dependent template name. 1027 UnqualifiedId Name; 1028 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 1029 ConsumeToken(); // the identifier 1030 1031 // Parse the ellipsis. 1032 if (Tok.is(tok::ellipsis)) 1033 EllipsisLoc = ConsumeToken(); 1034 1035 // If the next token signals the end of a template argument, 1036 // then we have a dependent template name that could be a template 1037 // template argument. 1038 TemplateTy Template; 1039 if (isEndOfTemplateArgument(Tok) && 1040 Actions.ActOnDependentTemplateName(getCurScope(), 1041 SS, TemplateKWLoc, Name, 1042 /*ObjectType=*/ ParsedType(), 1043 /*EnteringContext=*/false, 1044 Template)) 1045 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 1046 } 1047 } else if (Tok.is(tok::identifier)) { 1048 // We may have a (non-dependent) template name. 1049 TemplateTy Template; 1050 UnqualifiedId Name; 1051 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 1052 ConsumeToken(); // the identifier 1053 1054 // Parse the ellipsis. 1055 if (Tok.is(tok::ellipsis)) 1056 EllipsisLoc = ConsumeToken(); 1057 1058 if (isEndOfTemplateArgument(Tok)) { 1059 bool MemberOfUnknownSpecialization; 1060 TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 1061 /*hasTemplateKeyword=*/false, 1062 Name, 1063 /*ObjectType=*/ ParsedType(), 1064 /*EnteringContext=*/false, 1065 Template, 1066 MemberOfUnknownSpecialization); 1067 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) { 1068 // We have an id-expression that refers to a class template or 1069 // (C++0x) alias template. 1070 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation); 1071 } 1072 } 1073 } 1074 1075 // If this is a pack expansion, build it as such. 1076 if (EllipsisLoc.isValid() && !Result.isInvalid()) 1077 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc); 1078 1079 return Result; 1080 } 1081 1082 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]). 1083 /// 1084 /// template-argument: [C++ 14.2] 1085 /// constant-expression 1086 /// type-id 1087 /// id-expression 1088 ParsedTemplateArgument Parser::ParseTemplateArgument() { 1089 // C++ [temp.arg]p2: 1090 // In a template-argument, an ambiguity between a type-id and an 1091 // expression is resolved to a type-id, regardless of the form of 1092 // the corresponding template-parameter. 1093 // 1094 // Therefore, we initially try to parse a type-id. 1095 if (isCXXTypeId(TypeIdAsTemplateArgument)) { 1096 SourceLocation Loc = Tok.getLocation(); 1097 TypeResult TypeArg = ParseTypeName(/*Range=*/0, 1098 Declarator::TemplateTypeArgContext); 1099 if (TypeArg.isInvalid()) 1100 return ParsedTemplateArgument(); 1101 1102 return ParsedTemplateArgument(ParsedTemplateArgument::Type, 1103 TypeArg.get().getAsOpaquePtr(), 1104 Loc); 1105 } 1106 1107 // Try to parse a template template argument. 1108 { 1109 TentativeParsingAction TPA(*this); 1110 1111 ParsedTemplateArgument TemplateTemplateArgument 1112 = ParseTemplateTemplateArgument(); 1113 if (!TemplateTemplateArgument.isInvalid()) { 1114 TPA.Commit(); 1115 return TemplateTemplateArgument; 1116 } 1117 1118 // Revert this tentative parse to parse a non-type template argument. 1119 TPA.Revert(); 1120 } 1121 1122 // Parse a non-type template argument. 1123 SourceLocation Loc = Tok.getLocation(); 1124 ExprResult ExprArg = ParseConstantExpression(MaybeTypeCast); 1125 if (ExprArg.isInvalid() || !ExprArg.get()) 1126 return ParsedTemplateArgument(); 1127 1128 return ParsedTemplateArgument(ParsedTemplateArgument::NonType, 1129 ExprArg.release(), Loc); 1130 } 1131 1132 /// \brief Determine whether the current tokens can only be parsed as a 1133 /// template argument list (starting with the '<') and never as a '<' 1134 /// expression. 1135 bool Parser::IsTemplateArgumentList(unsigned Skip) { 1136 struct AlwaysRevertAction : TentativeParsingAction { 1137 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { } 1138 ~AlwaysRevertAction() { Revert(); } 1139 } Tentative(*this); 1140 1141 while (Skip) { 1142 ConsumeToken(); 1143 --Skip; 1144 } 1145 1146 // '<' 1147 if (!Tok.is(tok::less)) 1148 return false; 1149 ConsumeToken(); 1150 1151 // An empty template argument list. 1152 if (Tok.is(tok::greater)) 1153 return true; 1154 1155 // See whether we have declaration specifiers, which indicate a type. 1156 while (isCXXDeclarationSpecifier() == TPResult::True()) 1157 ConsumeToken(); 1158 1159 // If we have a '>' or a ',' then this is a template argument list. 1160 return Tok.is(tok::greater) || Tok.is(tok::comma); 1161 } 1162 1163 /// ParseTemplateArgumentList - Parse a C++ template-argument-list 1164 /// (C++ [temp.names]). Returns true if there was an error. 1165 /// 1166 /// template-argument-list: [C++ 14.2] 1167 /// template-argument 1168 /// template-argument-list ',' template-argument 1169 bool 1170 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) { 1171 while (true) { 1172 ParsedTemplateArgument Arg = ParseTemplateArgument(); 1173 if (Tok.is(tok::ellipsis)) { 1174 SourceLocation EllipsisLoc = ConsumeToken(); 1175 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc); 1176 } 1177 1178 if (Arg.isInvalid()) { 1179 SkipUntil(tok::comma, tok::greater, true, true); 1180 return true; 1181 } 1182 1183 // Save this template argument. 1184 TemplateArgs.push_back(Arg); 1185 1186 // If the next token is a comma, consume it and keep reading 1187 // arguments. 1188 if (Tok.isNot(tok::comma)) break; 1189 1190 // Consume the comma. 1191 ConsumeToken(); 1192 } 1193 1194 return false; 1195 } 1196 1197 /// \brief Parse a C++ explicit template instantiation 1198 /// (C++ [temp.explicit]). 1199 /// 1200 /// explicit-instantiation: 1201 /// 'extern' [opt] 'template' declaration 1202 /// 1203 /// Note that the 'extern' is a GNU extension and C++11 feature. 1204 Decl *Parser::ParseExplicitInstantiation(unsigned Context, 1205 SourceLocation ExternLoc, 1206 SourceLocation TemplateLoc, 1207 SourceLocation &DeclEnd, 1208 AccessSpecifier AS) { 1209 // This isn't really required here. 1210 ParsingDeclRAIIObject 1211 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent); 1212 1213 return ParseSingleDeclarationAfterTemplate(Context, 1214 ParsedTemplateInfo(ExternLoc, 1215 TemplateLoc), 1216 ParsingTemplateParams, 1217 DeclEnd, AS); 1218 } 1219 1220 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const { 1221 if (TemplateParams) 1222 return getTemplateParamsRange(TemplateParams->data(), 1223 TemplateParams->size()); 1224 1225 SourceRange R(TemplateLoc); 1226 if (ExternLoc.isValid()) 1227 R.setBegin(ExternLoc); 1228 return R; 1229 } 1230 1231 void Parser::LateTemplateParserCallback(void *P, const FunctionDecl *FD) { 1232 ((Parser*)P)->LateTemplateParser(FD); 1233 } 1234 1235 1236 void Parser::LateTemplateParser(const FunctionDecl *FD) { 1237 LateParsedTemplatedFunction *LPT = LateParsedTemplateMap[FD]; 1238 if (LPT) { 1239 ParseLateTemplatedFuncDef(*LPT); 1240 return; 1241 } 1242 1243 llvm_unreachable("Late templated function without associated lexed tokens"); 1244 } 1245 1246 /// \brief Late parse a C++ function template in Microsoft mode. 1247 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplatedFunction &LMT) { 1248 if(!LMT.D) 1249 return; 1250 1251 // Get the FunctionDecl. 1252 FunctionDecl *FD = 0; 1253 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(LMT.D)) 1254 FD = FunTmpl->getTemplatedDecl(); 1255 else 1256 FD = cast<FunctionDecl>(LMT.D); 1257 1258 // To restore the context after late parsing. 1259 Sema::ContextRAII GlobalSavedContext(Actions, Actions.CurContext); 1260 1261 SmallVector<ParseScope*, 4> TemplateParamScopeStack; 1262 DeclaratorDecl* Declarator = dyn_cast<DeclaratorDecl>(FD); 1263 if (Declarator && Declarator->getNumTemplateParameterLists() != 0) { 1264 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::TemplateParamScope)); 1265 Actions.ActOnReenterDeclaratorTemplateScope(getCurScope(), Declarator); 1266 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1267 } else { 1268 // Get the list of DeclContext to reenter. 1269 SmallVector<DeclContext*, 4> DeclContextToReenter; 1270 DeclContext *DD = FD->getLexicalParent(); 1271 while (DD && !DD->isTranslationUnit()) { 1272 DeclContextToReenter.push_back(DD); 1273 DD = DD->getLexicalParent(); 1274 } 1275 1276 // Reenter template scopes from outmost to innermost. 1277 SmallVector<DeclContext*, 4>::reverse_iterator II = 1278 DeclContextToReenter.rbegin(); 1279 for (; II != DeclContextToReenter.rend(); ++II) { 1280 if (ClassTemplatePartialSpecializationDecl* MD = 1281 dyn_cast_or_null<ClassTemplatePartialSpecializationDecl>(*II)) { 1282 TemplateParamScopeStack.push_back(new ParseScope(this, 1283 Scope::TemplateParamScope)); 1284 Actions.ActOnReenterTemplateScope(getCurScope(), MD); 1285 } else if (CXXRecordDecl* MD = dyn_cast_or_null<CXXRecordDecl>(*II)) { 1286 TemplateParamScopeStack.push_back(new ParseScope(this, 1287 Scope::TemplateParamScope, 1288 MD->getDescribedClassTemplate() != 0 )); 1289 Actions.ActOnReenterTemplateScope(getCurScope(), 1290 MD->getDescribedClassTemplate()); 1291 } 1292 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope)); 1293 Actions.PushDeclContext(Actions.getCurScope(), *II); 1294 } 1295 TemplateParamScopeStack.push_back(new ParseScope(this, 1296 Scope::TemplateParamScope)); 1297 Actions.ActOnReenterTemplateScope(getCurScope(), LMT.D); 1298 } 1299 1300 assert(!LMT.Toks.empty() && "Empty body!"); 1301 1302 // Append the current token at the end of the new token stream so that it 1303 // doesn't get lost. 1304 LMT.Toks.push_back(Tok); 1305 PP.EnterTokenStream(LMT.Toks.data(), LMT.Toks.size(), true, false); 1306 1307 // Consume the previously pushed token. 1308 ConsumeAnyToken(); 1309 assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try)) 1310 && "Inline method not starting with '{', ':' or 'try'"); 1311 1312 // Parse the method body. Function body parsing code is similar enough 1313 // to be re-used for method bodies as well. 1314 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope); 1315 1316 // Recreate the containing function DeclContext. 1317 Sema::ContextRAII FunctionSavedContext(Actions, Actions.getContainingDC(FD)); 1318 1319 if (FunctionTemplateDecl *FunctionTemplate 1320 = dyn_cast_or_null<FunctionTemplateDecl>(LMT.D)) 1321 Actions.ActOnStartOfFunctionDef(getCurScope(), 1322 FunctionTemplate->getTemplatedDecl()); 1323 if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(LMT.D)) 1324 Actions.ActOnStartOfFunctionDef(getCurScope(), Function); 1325 1326 1327 if (Tok.is(tok::kw_try)) { 1328 ParseFunctionTryBlock(LMT.D, FnScope); 1329 } else { 1330 if (Tok.is(tok::colon)) 1331 ParseConstructorInitializer(LMT.D); 1332 else 1333 Actions.ActOnDefaultCtorInitializers(LMT.D); 1334 1335 if (Tok.is(tok::l_brace)) { 1336 ParseFunctionStatementBody(LMT.D, FnScope); 1337 Actions.MarkAsLateParsedTemplate(FD, false); 1338 } else 1339 Actions.ActOnFinishFunctionBody(LMT.D, 0); 1340 } 1341 1342 // Exit scopes. 1343 FnScope.Exit(); 1344 SmallVector<ParseScope*, 4>::reverse_iterator I = 1345 TemplateParamScopeStack.rbegin(); 1346 for (; I != TemplateParamScopeStack.rend(); ++I) 1347 delete *I; 1348 1349 DeclGroupPtrTy grp = Actions.ConvertDeclToDeclGroup(LMT.D); 1350 if (grp) 1351 Actions.getASTConsumer().HandleTopLevelDecl(grp.get()); 1352 } 1353 1354 /// \brief Lex a delayed template function for late parsing. 1355 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) { 1356 tok::TokenKind kind = Tok.getKind(); 1357 if (!ConsumeAndStoreFunctionPrologue(Toks)) { 1358 // Consume everything up to (and including) the matching right brace. 1359 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1360 } 1361 1362 // If we're in a function-try-block, we need to store all the catch blocks. 1363 if (kind == tok::kw_try) { 1364 while (Tok.is(tok::kw_catch)) { 1365 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false); 1366 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false); 1367 } 1368 } 1369 } 1370