1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements parsing of C++ templates.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Parse/Parser.h"
15 #include "clang/Parse/ParseDiagnostic.h"
16 #include "clang/Parse/DeclSpec.h"
17 #include "clang/Parse/Scope.h"
18 using namespace clang;
20 /// \brief Parse a template declaration, explicit instantiation, or
21 /// explicit specialization.
23 Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
24 SourceLocation &DeclEnd,
26 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less))
27 return ParseExplicitInstantiation(ConsumeToken(), DeclEnd);
29 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS);
32 /// \brief Parse a template declaration or an explicit specialization.
34 /// Template declarations include one or more template parameter lists
35 /// and either the function or class template declaration. Explicit
36 /// specializations contain one or more 'template < >' prefixes
37 /// followed by a (possibly templated) declaration. Since the
38 /// syntactic form of both features is nearly identical, we parse all
39 /// of the template headers together and let semantic analysis sort
40 /// the declarations from the explicit specializations.
42 /// template-declaration: [C++ temp]
43 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
45 /// explicit-specialization: [ C++ temp.expl.spec]
46 /// 'template' '<' '>' declaration
48 Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
49 SourceLocation &DeclEnd,
51 assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
52 "Token does not start a template declaration.");
54 // Enter template-parameter scope.
55 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
57 // Parse multiple levels of template headers within this template
58 // parameter scope, e.g.,
60 // template<typename T>
61 // template<typename U>
62 // class A<T>::B { ... };
64 // We parse multiple levels non-recursively so that we can build a
65 // single data structure containing all of the template parameter
66 // lists to easily differentiate between the case above and:
68 // template<typename T>
70 // template<typename U> class B;
73 // In the first case, the action for declaring A<T>::B receives
74 // both template parameter lists. In the second case, the action for
75 // defining A<T>::B receives just the inner template parameter list
76 // (and retrieves the outer template parameter list from its
78 bool isSpecialiation = true;
79 TemplateParameterLists ParamLists;
81 // Consume the 'export', if any.
82 SourceLocation ExportLoc;
83 if (Tok.is(tok::kw_export)) {
84 ExportLoc = ConsumeToken();
87 // Consume the 'template', which should be here.
88 SourceLocation TemplateLoc;
89 if (Tok.is(tok::kw_template)) {
90 TemplateLoc = ConsumeToken();
92 Diag(Tok.getLocation(), diag::err_expected_template);
96 // Parse the '<' template-parameter-list '>'
97 SourceLocation LAngleLoc, RAngleLoc;
98 TemplateParameterList TemplateParams;
99 ParseTemplateParameters(ParamLists.size(), TemplateParams, LAngleLoc,
102 if (!TemplateParams.empty())
103 isSpecialiation = false;
105 ParamLists.push_back(
106 Actions.ActOnTemplateParameterList(ParamLists.size(), ExportLoc,
107 TemplateLoc, LAngleLoc,
108 TemplateParams.data(),
109 TemplateParams.size(), RAngleLoc));
110 } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
112 // Parse the actual template declaration.
113 return ParseSingleDeclarationAfterTemplate(Context,
114 ParsedTemplateInfo(&ParamLists,
119 /// \brief Parse a single declaration that declares a template,
120 /// template specialization, or explicit instantiation of a template.
122 /// \param TemplateParams if non-NULL, the template parameter lists
123 /// that preceded this declaration. In this case, the declaration is a
124 /// template declaration, out-of-line definition of a template, or an
125 /// explicit template specialization. When NULL, the declaration is an
126 /// explicit template instantiation.
128 /// \param TemplateLoc when TemplateParams is NULL, the location of
129 /// the 'template' keyword that indicates that we have an explicit
130 /// template instantiation.
132 /// \param DeclEnd will receive the source location of the last token
133 /// within this declaration.
135 /// \param AS the access specifier associated with this
136 /// declaration. Will be AS_none for namespace-scope declarations.
138 /// \returns the new declaration.
140 Parser::ParseSingleDeclarationAfterTemplate(
142 const ParsedTemplateInfo &TemplateInfo,
143 SourceLocation &DeclEnd,
144 AccessSpecifier AS) {
145 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
146 "Template information required");
148 // Parse the declaration specifiers.
150 // FIXME: Pass TemplateLoc through for explicit template instantiations
151 ParseDeclarationSpecifiers(DS, TemplateInfo, AS);
153 if (Tok.is(tok::semi)) {
154 DeclEnd = ConsumeToken();
155 return Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
158 // Parse the declarator.
159 Declarator DeclaratorInfo(DS, (Declarator::TheContext)Context);
160 ParseDeclarator(DeclaratorInfo);
161 // Error parsing the declarator?
162 if (!DeclaratorInfo.hasName()) {
163 // If so, skip until the semi-colon or a }.
164 SkipUntil(tok::r_brace, true, true);
165 if (Tok.is(tok::semi))
170 // If we have a declaration or declarator list, handle it.
171 if (isDeclarationAfterDeclarator()) {
172 // Parse this declaration.
173 DeclPtrTy ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo);
175 if (Tok.is(tok::comma)) {
176 Diag(Tok, diag::err_multiple_template_declarators)
177 << (int)TemplateInfo.Kind;
178 SkipUntil(tok::semi, true, false);
182 // Eat the semi colon after the declaration.
183 ExpectAndConsume(tok::semi, diag::err_expected_semi_declation);
187 if (DeclaratorInfo.isFunctionDeclarator() &&
188 isStartOfFunctionDefinition()) {
189 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
190 Diag(Tok, diag::err_function_declared_typedef);
192 if (Tok.is(tok::l_brace)) {
193 // This recovery skips the entire function body. It would be nice
194 // to simply call ParseFunctionDefinition() below, however Sema
195 // assumes the declarator represents a function, not a typedef.
197 SkipUntil(tok::r_brace, true);
199 SkipUntil(tok::semi);
203 return ParseFunctionDefinition(DeclaratorInfo);
206 if (DeclaratorInfo.isFunctionDeclarator())
207 Diag(Tok, diag::err_expected_fn_body);
209 Diag(Tok, diag::err_invalid_token_after_toplevel_declarator);
210 SkipUntil(tok::semi);
214 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
215 /// angle brackets. Depth is the depth of this template-parameter-list, which
216 /// is the number of template headers directly enclosing this template header.
217 /// TemplateParams is the current list of template parameters we're building.
218 /// The template parameter we parse will be added to this list. LAngleLoc and
219 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
220 /// that enclose this template parameter list.
221 bool Parser::ParseTemplateParameters(unsigned Depth,
222 TemplateParameterList &TemplateParams,
223 SourceLocation &LAngleLoc,
224 SourceLocation &RAngleLoc) {
225 // Get the template parameter list.
226 if(!Tok.is(tok::less)) {
227 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
230 LAngleLoc = ConsumeToken();
232 // Try to parse the template parameter list.
233 if (Tok.is(tok::greater))
234 RAngleLoc = ConsumeToken();
235 else if(ParseTemplateParameterList(Depth, TemplateParams)) {
236 if(!Tok.is(tok::greater)) {
237 Diag(Tok.getLocation(), diag::err_expected_greater);
240 RAngleLoc = ConsumeToken();
245 /// ParseTemplateParameterList - Parse a template parameter list. If
246 /// the parsing fails badly (i.e., closing bracket was left out), this
247 /// will try to put the token stream in a reasonable position (closing
248 /// a statement, etc.) and return false.
250 /// template-parameter-list: [C++ temp]
251 /// template-parameter
252 /// template-parameter-list ',' template-parameter
254 Parser::ParseTemplateParameterList(unsigned Depth,
255 TemplateParameterList &TemplateParams) {
257 if (DeclPtrTy TmpParam
258 = ParseTemplateParameter(Depth, TemplateParams.size())) {
259 TemplateParams.push_back(TmpParam);
261 // If we failed to parse a template parameter, skip until we find
262 // a comma or closing brace.
263 SkipUntil(tok::comma, tok::greater, true, true);
266 // Did we find a comma or the end of the template parmeter list?
267 if(Tok.is(tok::comma)) {
269 } else if(Tok.is(tok::greater)) {
270 // Don't consume this... that's done by template parser.
273 // Somebody probably forgot to close the template. Skip ahead and
274 // try to get out of the expression. This error is currently
275 // subsumed by whatever goes on in ParseTemplateParameter.
276 // TODO: This could match >>, and it would be nice to avoid those
277 // silly errors with template <vec<T>>.
278 // Diag(Tok.getLocation(), diag::err_expected_comma_greater);
279 SkipUntil(tok::greater, true, true);
286 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
288 /// template-parameter: [C++ temp.param]
290 /// parameter-declaration
292 /// type-parameter: (see below)
293 /// 'class' ...[opt][C++0x] identifier[opt]
294 /// 'class' identifier[opt] '=' type-id
295 /// 'typename' ...[opt][C++0x] identifier[opt]
296 /// 'typename' identifier[opt] '=' type-id
297 /// 'template' ...[opt][C++0x] '<' template-parameter-list '>' 'class' identifier[opt]
298 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] = id-expression
300 Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
301 if(Tok.is(tok::kw_class) ||
302 (Tok.is(tok::kw_typename) &&
303 // FIXME: Next token has not been annotated!
304 NextToken().isNot(tok::annot_typename))) {
305 return ParseTypeParameter(Depth, Position);
308 if(Tok.is(tok::kw_template))
309 return ParseTemplateTemplateParameter(Depth, Position);
311 // If it's none of the above, then it must be a parameter declaration.
312 // NOTE: This will pick up errors in the closure of the template parameter
313 // list (e.g., template < ; Check here to implement >> style closures.
314 return ParseNonTypeTemplateParameter(Depth, Position);
317 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
318 /// Other kinds of template parameters are parsed in
319 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
321 /// type-parameter: [C++ temp.param]
322 /// 'class' ...[opt][C++0x] identifier[opt]
323 /// 'class' identifier[opt] '=' type-id
324 /// 'typename' ...[opt][C++0x] identifier[opt]
325 /// 'typename' identifier[opt] '=' type-id
326 Parser::DeclPtrTy Parser::ParseTypeParameter(unsigned Depth, unsigned Position){
327 assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) &&
328 "A type-parameter starts with 'class' or 'typename'");
330 // Consume the 'class' or 'typename' keyword.
331 bool TypenameKeyword = Tok.is(tok::kw_typename);
332 SourceLocation KeyLoc = ConsumeToken();
334 // Grab the ellipsis (if given).
335 bool Ellipsis = false;
336 SourceLocation EllipsisLoc;
337 if (Tok.is(tok::ellipsis)) {
339 EllipsisLoc = ConsumeToken();
341 if (!getLang().CPlusPlus0x)
342 Diag(EllipsisLoc, diag::err_variadic_templates);
345 // Grab the template parameter name (if given)
346 SourceLocation NameLoc;
347 IdentifierInfo* ParamName = 0;
348 if(Tok.is(tok::identifier)) {
349 ParamName = Tok.getIdentifierInfo();
350 NameLoc = ConsumeToken();
351 } else if(Tok.is(tok::equal) || Tok.is(tok::comma) ||
352 Tok.is(tok::greater)) {
353 // Unnamed template parameter. Don't have to do anything here, just
354 // don't consume this token.
356 Diag(Tok.getLocation(), diag::err_expected_ident);
360 DeclPtrTy TypeParam = Actions.ActOnTypeParameter(CurScope, TypenameKeyword,
361 Ellipsis, EllipsisLoc,
362 KeyLoc, ParamName, NameLoc,
365 // Grab a default type id (if given).
366 if(Tok.is(tok::equal)) {
367 SourceLocation EqualLoc = ConsumeToken();
368 SourceLocation DefaultLoc = Tok.getLocation();
369 TypeResult DefaultType = ParseTypeName();
370 if (!DefaultType.isInvalid())
371 Actions.ActOnTypeParameterDefault(TypeParam, EqualLoc, DefaultLoc,
378 /// ParseTemplateTemplateParameter - Handle the parsing of template
379 /// template parameters.
381 /// type-parameter: [C++ temp.param]
382 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
383 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt] = id-expression
385 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
386 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
388 // Handle the template <...> part.
389 SourceLocation TemplateLoc = ConsumeToken();
390 TemplateParameterList TemplateParams;
391 SourceLocation LAngleLoc, RAngleLoc;
393 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
394 if(!ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
400 // Generate a meaningful error if the user forgot to put class before the
401 // identifier, comma, or greater.
402 if(!Tok.is(tok::kw_class)) {
403 Diag(Tok.getLocation(), diag::err_expected_class_before)
404 << PP.getSpelling(Tok);
407 SourceLocation ClassLoc = ConsumeToken();
409 // Get the identifier, if given.
410 SourceLocation NameLoc;
411 IdentifierInfo* ParamName = 0;
412 if(Tok.is(tok::identifier)) {
413 ParamName = Tok.getIdentifierInfo();
414 NameLoc = ConsumeToken();
415 } else if(Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) {
416 // Unnamed template parameter. Don't have to do anything here, just
417 // don't consume this token.
419 Diag(Tok.getLocation(), diag::err_expected_ident);
423 TemplateParamsTy *ParamList =
424 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
425 TemplateLoc, LAngleLoc,
427 TemplateParams.size(),
430 Parser::DeclPtrTy Param
431 = Actions.ActOnTemplateTemplateParameter(CurScope, TemplateLoc,
432 ParamList, ParamName,
433 NameLoc, Depth, Position);
435 // Get the a default value, if given.
436 if (Tok.is(tok::equal)) {
437 SourceLocation EqualLoc = ConsumeToken();
438 OwningExprResult DefaultExpr = ParseCXXIdExpression();
439 if (DefaultExpr.isInvalid())
442 Actions.ActOnTemplateTemplateParameterDefault(Param, EqualLoc,
449 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
450 /// template parameters (e.g., in "template<int Size> class array;").
452 /// template-parameter:
454 /// parameter-declaration
456 /// NOTE: It would be ideal to simply call out to ParseParameterDeclaration(),
457 /// but that didn't work out to well. Instead, this tries to recrate the basic
458 /// parsing of parameter declarations, but tries to constrain it for template
460 /// FIXME: We need to make a ParseParameterDeclaration that works for
461 /// non-type template parameters and normal function parameters.
463 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
464 SourceLocation StartLoc = Tok.getLocation();
466 // Parse the declaration-specifiers (i.e., the type).
467 // FIXME: The type should probably be restricted in some way... Not all
468 // declarators (parts of declarators?) are accepted for parameters.
470 ParseDeclarationSpecifiers(DS);
472 // Parse this as a typename.
473 Declarator ParamDecl(DS, Declarator::TemplateParamContext);
474 ParseDeclarator(ParamDecl);
475 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified && !DS.getTypeRep()) {
476 // This probably shouldn't happen - and it's more of a Sema thing, but
477 // basically we didn't parse the type name because we couldn't associate
478 // it with an AST node. we should just skip to the comma or greater.
479 // TODO: This is currently a placeholder for some kind of Sema Error.
480 Diag(Tok.getLocation(), diag::err_parse_error);
481 SkipUntil(tok::comma, tok::greater, true, true);
485 // Create the parameter.
486 DeclPtrTy Param = Actions.ActOnNonTypeTemplateParameter(CurScope, ParamDecl,
489 // If there is a default value, parse it.
490 if (Tok.is(tok::equal)) {
491 SourceLocation EqualLoc = ConsumeToken();
493 // C++ [temp.param]p15:
494 // When parsing a default template-argument for a non-type
495 // template-parameter, the first non-nested > is taken as the
496 // end of the template-parameter-list rather than a greater-than
498 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
500 OwningExprResult DefaultArg = ParseAssignmentExpression();
501 if (DefaultArg.isInvalid())
502 SkipUntil(tok::comma, tok::greater, true, true);
504 Actions.ActOnNonTypeTemplateParameterDefault(Param, EqualLoc,
511 /// \brief Parses a template-id that after the template name has
512 /// already been parsed.
514 /// This routine takes care of parsing the enclosed template argument
515 /// list ('<' template-parameter-list [opt] '>') and placing the
516 /// results into a form that can be transferred to semantic analysis.
518 /// \param Template the template declaration produced by isTemplateName
520 /// \param TemplateNameLoc the source location of the template name
522 /// \param SS if non-NULL, the nested-name-specifier preceding the
525 /// \param ConsumeLastToken if true, then we will consume the last
526 /// token that forms the template-id. Otherwise, we will leave the
527 /// last token in the stream (e.g., so that it can be replaced with an
528 /// annotation token).
530 Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
531 SourceLocation TemplateNameLoc,
532 const CXXScopeSpec *SS,
533 bool ConsumeLastToken,
534 SourceLocation &LAngleLoc,
535 TemplateArgList &TemplateArgs,
536 TemplateArgIsTypeList &TemplateArgIsType,
537 TemplateArgLocationList &TemplateArgLocations,
538 SourceLocation &RAngleLoc) {
539 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
542 LAngleLoc = ConsumeToken();
544 // Parse the optional template-argument-list.
545 bool Invalid = false;
547 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
548 if (Tok.isNot(tok::greater))
549 Invalid = ParseTemplateArgumentList(TemplateArgs, TemplateArgIsType,
550 TemplateArgLocations);
553 // Try to find the closing '>'.
554 SkipUntil(tok::greater, true, !ConsumeLastToken);
560 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
563 // Determine the location of the '>' or '>>'. Only consume this
564 // token if the caller asked us to.
565 RAngleLoc = Tok.getLocation();
567 if (Tok.is(tok::greatergreater)) {
568 if (!getLang().CPlusPlus0x) {
569 const char *ReplaceStr = "> >";
570 if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
573 Diag(Tok.getLocation(), diag::err_two_right_angle_brackets_need_space)
574 << CodeModificationHint::CreateReplacement(
575 SourceRange(Tok.getLocation()), ReplaceStr);
578 Tok.setKind(tok::greater);
579 if (!ConsumeLastToken) {
580 // Since we're not supposed to consume the '>>' token, we need
581 // to insert a second '>' token after the first.
584 } else if (ConsumeLastToken)
590 /// \brief Replace the tokens that form a simple-template-id with an
591 /// annotation token containing the complete template-id.
593 /// The first token in the stream must be the name of a template that
594 /// is followed by a '<'. This routine will parse the complete
595 /// simple-template-id and replace the tokens with a single annotation
596 /// token with one of two different kinds: if the template-id names a
597 /// type (and \p AllowTypeAnnotation is true), the annotation token is
598 /// a type annotation that includes the optional nested-name-specifier
599 /// (\p SS). Otherwise, the annotation token is a template-id
600 /// annotation that does not include the optional
601 /// nested-name-specifier.
603 /// \param Template the declaration of the template named by the first
604 /// token (an identifier), as returned from \c Action::isTemplateName().
606 /// \param TemplateNameKind the kind of template that \p Template
607 /// refers to, as returned from \c Action::isTemplateName().
609 /// \param SS if non-NULL, the nested-name-specifier that precedes
610 /// this template name.
612 /// \param TemplateKWLoc if valid, specifies that this template-id
613 /// annotation was preceded by the 'template' keyword and gives the
614 /// location of that keyword. If invalid (the default), then this
615 /// template-id was not preceded by a 'template' keyword.
617 /// \param AllowTypeAnnotation if true (the default), then a
618 /// simple-template-id that refers to a class template, template
619 /// template parameter, or other template that produces a type will be
620 /// replaced with a type annotation token. Otherwise, the
621 /// simple-template-id is always replaced with a template-id
622 /// annotation token.
623 void Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
624 const CXXScopeSpec *SS,
625 SourceLocation TemplateKWLoc,
626 bool AllowTypeAnnotation) {
627 assert(getLang().CPlusPlus && "Can only annotate template-ids in C++");
628 assert(Template && Tok.is(tok::identifier) && NextToken().is(tok::less) &&
629 "Parser isn't at the beginning of a template-id");
631 // Consume the template-name.
632 IdentifierInfo *Name = Tok.getIdentifierInfo();
633 SourceLocation TemplateNameLoc = ConsumeToken();
635 // Parse the enclosed template argument list.
636 SourceLocation LAngleLoc, RAngleLoc;
637 TemplateArgList TemplateArgs;
638 TemplateArgIsTypeList TemplateArgIsType;
639 TemplateArgLocationList TemplateArgLocations;
640 bool Invalid = ParseTemplateIdAfterTemplateName(Template, TemplateNameLoc,
641 SS, false, LAngleLoc,
644 TemplateArgLocations,
647 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
648 TemplateArgIsType.data(),
649 TemplateArgs.size());
651 if (Invalid) // FIXME: How to recover from a broken template-id?
654 // Build the annotation token.
655 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
656 Action::TypeResult Type
657 = Actions.ActOnTemplateIdType(Template, TemplateNameLoc,
658 LAngleLoc, TemplateArgsPtr,
659 &TemplateArgLocations[0],
661 if (Type.isInvalid()) // FIXME: better recovery?
664 Tok.setKind(tok::annot_typename);
665 Tok.setAnnotationValue(Type.get());
666 if (SS && SS->isNotEmpty())
667 Tok.setLocation(SS->getBeginLoc());
668 else if (TemplateKWLoc.isValid())
669 Tok.setLocation(TemplateKWLoc);
671 Tok.setLocation(TemplateNameLoc);
673 // Build a template-id annotation token that can be processed
675 Tok.setKind(tok::annot_template_id);
676 TemplateIdAnnotation *TemplateId
677 = TemplateIdAnnotation::Allocate(TemplateArgs.size());
678 TemplateId->TemplateNameLoc = TemplateNameLoc;
679 TemplateId->Name = Name;
680 TemplateId->Template = Template.getAs<void*>();
681 TemplateId->Kind = TNK;
682 TemplateId->LAngleLoc = LAngleLoc;
683 TemplateId->RAngleLoc = RAngleLoc;
684 void **Args = TemplateId->getTemplateArgs();
685 bool *ArgIsType = TemplateId->getTemplateArgIsType();
686 SourceLocation *ArgLocs = TemplateId->getTemplateArgLocations();
687 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg) {
688 Args[Arg] = TemplateArgs[Arg];
689 ArgIsType[Arg] = TemplateArgIsType[Arg];
690 ArgLocs[Arg] = TemplateArgLocations[Arg];
692 Tok.setAnnotationValue(TemplateId);
693 if (TemplateKWLoc.isValid())
694 Tok.setLocation(TemplateKWLoc);
696 Tok.setLocation(TemplateNameLoc);
698 TemplateArgsPtr.release();
701 // Common fields for the annotation token
702 Tok.setAnnotationEndLoc(RAngleLoc);
704 // In case the tokens were cached, have Preprocessor replace them with the
706 PP.AnnotateCachedTokens(Tok);
709 /// \brief Replaces a template-id annotation token with a type
710 /// annotation token.
712 /// If there was a failure when forming the type from the template-id,
713 /// a type annotation token will still be created, but will have a
714 /// NULL type pointer to signify an error.
715 void Parser::AnnotateTemplateIdTokenAsType(const CXXScopeSpec *SS) {
716 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
718 TemplateIdAnnotation *TemplateId
719 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
720 assert((TemplateId->Kind == TNK_Type_template ||
721 TemplateId->Kind == TNK_Dependent_template_name) &&
722 "Only works for type and dependent templates");
724 ASTTemplateArgsPtr TemplateArgsPtr(Actions,
725 TemplateId->getTemplateArgs(),
726 TemplateId->getTemplateArgIsType(),
727 TemplateId->NumArgs);
729 Action::TypeResult Type
730 = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
731 TemplateId->TemplateNameLoc,
732 TemplateId->LAngleLoc,
734 TemplateId->getTemplateArgLocations(),
735 TemplateId->RAngleLoc);
736 // Create the new "type" annotation token.
737 Tok.setKind(tok::annot_typename);
738 Tok.setAnnotationValue(Type.isInvalid()? 0 : Type.get());
739 if (SS && SS->isNotEmpty()) // it was a C++ qualified type name.
740 Tok.setLocation(SS->getBeginLoc());
742 // We might be backtracking, in which case we need to replace the
743 // template-id annotation token with the type annotation within the
744 // set of cached tokens. That way, we won't try to form the same
745 // class template specialization again.
746 PP.ReplaceLastTokenWithAnnotation(Tok);
747 TemplateId->Destroy();
750 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
752 /// template-argument: [C++ 14.2]
753 /// constant-expression
756 void *Parser::ParseTemplateArgument(bool &ArgIsType) {
758 // In a template-argument, an ambiguity between a type-id and an
759 // expression is resolved to a type-id, regardless of the form of
760 // the corresponding template-parameter.
762 // Therefore, we initially try to parse a type-id.
763 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
765 TypeResult TypeArg = ParseTypeName();
766 if (TypeArg.isInvalid())
768 return TypeArg.get();
771 OwningExprResult ExprArg = ParseConstantExpression();
772 if (ExprArg.isInvalid() || !ExprArg.get())
776 return ExprArg.release();
779 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
780 /// (C++ [temp.names]). Returns true if there was an error.
782 /// template-argument-list: [C++ 14.2]
783 /// template-argument
784 /// template-argument-list ',' template-argument
786 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs,
787 TemplateArgIsTypeList &TemplateArgIsType,
788 TemplateArgLocationList &TemplateArgLocations) {
791 SourceLocation Loc = Tok.getLocation();
792 void *Arg = ParseTemplateArgument(IsType);
794 TemplateArgs.push_back(Arg);
795 TemplateArgIsType.push_back(IsType);
796 TemplateArgLocations.push_back(Loc);
798 SkipUntil(tok::comma, tok::greater, true, true);
802 // If the next token is a comma, consume it and keep reading
804 if (Tok.isNot(tok::comma)) break;
806 // Consume the comma.
810 return Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater);
813 /// \brief Parse a C++ explicit template instantiation
814 /// (C++ [temp.explicit]).
816 /// explicit-instantiation:
817 /// 'template' declaration
819 Parser::ParseExplicitInstantiation(SourceLocation TemplateLoc,
820 SourceLocation &DeclEnd) {
821 return ParseSingleDeclarationAfterTemplate(Declarator::FileContext,
822 ParsedTemplateInfo(TemplateLoc),