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/AST/ASTContext.h"
15 #include "clang/AST/DeclTemplate.h"
16 #include "clang/Parse/ParseDiagnostic.h"
17 #include "clang/Parse/Parser.h"
18 #include "clang/Parse/RAIIObjectsForParser.h"
19 #include "clang/Sema/DeclSpec.h"
20 #include "clang/Sema/ParsedTemplate.h"
21 #include "clang/Sema/Scope.h"
22 using namespace clang;
24 /// \brief Parse a template declaration, explicit instantiation, or
25 /// explicit specialization.
27 Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
28 SourceLocation &DeclEnd,
30 AttributeList *AccessAttrs) {
31 ObjCDeclContextSwitch ObjCDC(*this);
33 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
34 return ParseExplicitInstantiation(Context,
35 SourceLocation(), ConsumeToken(),
38 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
44 /// \brief Parse a template declaration or an explicit specialization.
46 /// Template declarations include one or more template parameter lists
47 /// and either the function or class template declaration. Explicit
48 /// specializations contain one or more 'template < >' prefixes
49 /// followed by a (possibly templated) declaration. Since the
50 /// syntactic form of both features is nearly identical, we parse all
51 /// of the template headers together and let semantic analysis sort
52 /// the declarations from the explicit specializations.
54 /// template-declaration: [C++ temp]
55 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
57 /// explicit-specialization: [ C++ temp.expl.spec]
58 /// 'template' '<' '>' declaration
60 Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
61 SourceLocation &DeclEnd,
63 AttributeList *AccessAttrs) {
64 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
65 "Token does not start a template declaration.");
67 // Enter template-parameter scope.
68 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
70 // Tell the action that names should be checked in the context of
71 // the declaration to come.
73 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
75 // Parse multiple levels of template headers within this template
76 // parameter scope, e.g.,
78 // template<typename T>
79 // template<typename U>
80 // class A<T>::B { ... };
82 // We parse multiple levels non-recursively so that we can build a
83 // single data structure containing all of the template parameter
84 // lists to easily differentiate between the case above and:
86 // template<typename T>
88 // template<typename U> class B;
91 // In the first case, the action for declaring A<T>::B receives
92 // both template parameter lists. In the second case, the action for
93 // defining A<T>::B receives just the inner template parameter list
94 // (and retrieves the outer template parameter list from its
96 bool isSpecialization = true;
97 bool LastParamListWasEmpty = false;
98 TemplateParameterLists ParamLists;
99 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
102 // Consume the 'export', if any.
103 SourceLocation ExportLoc;
104 TryConsumeToken(tok::kw_export, ExportLoc);
106 // Consume the 'template', which should be here.
107 SourceLocation TemplateLoc;
108 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
109 Diag(Tok.getLocation(), diag::err_expected_template);
113 // Parse the '<' template-parameter-list '>'
114 SourceLocation LAngleLoc, RAngleLoc;
115 SmallVector<NamedDecl*, 4> TemplateParams;
116 if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
117 TemplateParams, LAngleLoc, RAngleLoc)) {
118 // Skip until the semi-colon or a '}'.
119 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
120 TryConsumeToken(tok::semi);
124 ExprResult OptionalRequiresClauseConstraintER;
125 if (!TemplateParams.empty()) {
126 isSpecialization = false;
127 ++CurTemplateDepthTracker;
129 if (TryConsumeToken(tok::kw_requires)) {
130 OptionalRequiresClauseConstraintER =
131 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
132 if (!OptionalRequiresClauseConstraintER.isUsable()) {
133 // Skip until the semi-colon or a '}'.
134 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
135 TryConsumeToken(tok::semi);
140 LastParamListWasEmpty = true;
143 ParamLists.push_back(Actions.ActOnTemplateParameterList(
144 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
145 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
146 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
148 unsigned NewFlags = getCurScope()->getFlags() & ~Scope::TemplateParamScope;
149 ParseScopeFlags TemplateScopeFlags(this, NewFlags, isSpecialization);
151 // Parse the actual template declaration.
152 return ParseSingleDeclarationAfterTemplate(Context,
153 ParsedTemplateInfo(&ParamLists,
155 LastParamListWasEmpty),
156 ParsingTemplateParams,
157 DeclEnd, AS, AccessAttrs);
160 /// \brief Parse a single declaration that declares a template,
161 /// template specialization, or explicit instantiation of a template.
163 /// \param DeclEnd will receive the source location of the last token
164 /// within this declaration.
166 /// \param AS the access specifier associated with this
167 /// declaration. Will be AS_none for namespace-scope declarations.
169 /// \returns the new declaration.
171 Parser::ParseSingleDeclarationAfterTemplate(
173 const ParsedTemplateInfo &TemplateInfo,
174 ParsingDeclRAIIObject &DiagsFromTParams,
175 SourceLocation &DeclEnd,
177 AttributeList *AccessAttrs) {
178 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
179 "Template information required");
181 if (Tok.is(tok::kw_static_assert)) {
182 // A static_assert declaration may not be templated.
183 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
184 << TemplateInfo.getSourceRange();
185 // Parse the static_assert declaration to improve error recovery.
186 return ParseStaticAssertDeclaration(DeclEnd);
189 if (Context == Declarator::MemberContext) {
190 // We are parsing a member template.
191 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
196 ParsedAttributesWithRange prefixAttrs(AttrFactory);
197 MaybeParseCXX11Attributes(prefixAttrs);
199 if (Tok.is(tok::kw_using)) {
200 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
202 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
204 return usingDeclPtr.get().getSingleDecl();
207 // Parse the declaration specifiers, stealing any diagnostics from
208 // the template parameters.
209 ParsingDeclSpec DS(*this, &DiagsFromTParams);
211 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
212 getDeclSpecContextFromDeclaratorContext(Context));
214 if (Tok.is(tok::semi)) {
215 ProhibitAttributes(prefixAttrs);
216 DeclEnd = ConsumeToken();
217 RecordDecl *AnonRecord = nullptr;
218 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
219 getCurScope(), AS, DS,
220 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
221 : MultiTemplateParamsArg(),
222 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
224 assert(!AnonRecord &&
225 "Anonymous unions/structs should not be valid with template");
230 // Move the attributes from the prefix into the DS.
231 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
232 ProhibitAttributes(prefixAttrs);
234 DS.takeAttributesFrom(prefixAttrs);
236 // Parse the declarator.
237 ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
238 ParseDeclarator(DeclaratorInfo);
239 // Error parsing the declarator?
240 if (!DeclaratorInfo.hasName()) {
241 // If so, skip until the semi-colon or a }.
242 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
243 if (Tok.is(tok::semi))
248 LateParsedAttrList LateParsedAttrs(true);
249 if (DeclaratorInfo.isFunctionDeclarator())
250 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
252 if (DeclaratorInfo.isFunctionDeclarator() &&
253 isStartOfFunctionDefinition(DeclaratorInfo)) {
255 // Function definitions are only allowed at file scope and in C++ classes.
256 // The C++ inline method definition case is handled elsewhere, so we only
257 // need to handle the file scope definition case.
258 if (Context != Declarator::FileContext) {
259 Diag(Tok, diag::err_function_definition_not_allowed);
264 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
265 // Recover by ignoring the 'typedef'. This was probably supposed to be
266 // the 'typename' keyword, which we should have already suggested adding
267 // if it's appropriate.
268 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
269 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
270 DS.ClearStorageClassSpecs();
273 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
274 if (DeclaratorInfo.getName().getKind() != UnqualifiedId::IK_TemplateId) {
275 // If the declarator-id is not a template-id, issue a diagnostic and
276 // recover by ignoring the 'template' keyword.
277 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
278 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
281 SourceLocation LAngleLoc
282 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
283 Diag(DeclaratorInfo.getIdentifierLoc(),
284 diag::err_explicit_instantiation_with_definition)
285 << SourceRange(TemplateInfo.TemplateLoc)
286 << FixItHint::CreateInsertion(LAngleLoc, "<>");
288 // Recover as if it were an explicit specialization.
289 TemplateParameterLists FakedParamLists;
290 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
291 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
292 LAngleLoc, nullptr));
294 return ParseFunctionDefinition(
295 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
296 /*isSpecialization=*/true,
297 /*LastParamListWasEmpty=*/true),
301 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
305 // Parse this declaration.
306 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
309 if (Tok.is(tok::comma)) {
310 Diag(Tok, diag::err_multiple_template_declarators)
311 << (int)TemplateInfo.Kind;
312 SkipUntil(tok::semi);
316 // Eat the semi colon after the declaration.
317 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
318 if (LateParsedAttrs.size() > 0)
319 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
320 DeclaratorInfo.complete(ThisDecl);
324 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
325 /// angle brackets. Depth is the depth of this template-parameter-list, which
326 /// is the number of template headers directly enclosing this template header.
327 /// TemplateParams is the current list of template parameters we're building.
328 /// The template parameter we parse will be added to this list. LAngleLoc and
329 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
330 /// that enclose this template parameter list.
332 /// \returns true if an error occurred, false otherwise.
333 bool Parser::ParseTemplateParameters(
334 unsigned Depth, SmallVectorImpl<NamedDecl *> &TemplateParams,
335 SourceLocation &LAngleLoc, SourceLocation &RAngleLoc) {
336 // Get the template parameter list.
337 if (!TryConsumeToken(tok::less, LAngleLoc)) {
338 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
342 // Try to parse the template parameter list.
344 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
345 Failed = ParseTemplateParameterList(Depth, TemplateParams);
347 if (Tok.is(tok::greatergreater)) {
348 // No diagnostic required here: a template-parameter-list can only be
349 // followed by a declaration or, for a template template parameter, the
350 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
351 // This matters for elegant diagnosis of:
352 // template<template<typename>> struct S;
353 Tok.setKind(tok::greater);
354 RAngleLoc = Tok.getLocation();
355 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
356 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
357 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
363 /// ParseTemplateParameterList - Parse a template parameter list. If
364 /// the parsing fails badly (i.e., closing bracket was left out), this
365 /// will try to put the token stream in a reasonable position (closing
366 /// a statement, etc.) and return false.
368 /// template-parameter-list: [C++ temp]
369 /// template-parameter
370 /// template-parameter-list ',' template-parameter
372 Parser::ParseTemplateParameterList(unsigned Depth,
373 SmallVectorImpl<NamedDecl*> &TemplateParams) {
375 // FIXME: ParseTemplateParameter should probably just return a NamedDecl.
377 = ParseTemplateParameter(Depth, TemplateParams.size())) {
378 TemplateParams.push_back(dyn_cast<NamedDecl>(TmpParam));
380 // If we failed to parse a template parameter, skip until we find
381 // a comma or closing brace.
382 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
383 StopAtSemi | StopBeforeMatch);
386 // Did we find a comma or the end of the template parameter list?
387 if (Tok.is(tok::comma)) {
389 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
390 // Don't consume this... that's done by template parser.
393 // Somebody probably forgot to close the template. Skip ahead and
394 // try to get out of the expression. This error is currently
395 // subsumed by whatever goes on in ParseTemplateParameter.
396 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
397 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
398 StopAtSemi | StopBeforeMatch);
405 /// \brief Determine whether the parser is at the start of a template
407 bool Parser::isStartOfTemplateTypeParameter() {
408 if (Tok.is(tok::kw_class)) {
409 // "class" may be the start of an elaborated-type-specifier or a
410 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
411 switch (NextToken().getKind()) {
415 case tok::greatergreater:
419 case tok::identifier:
420 // This may be either a type-parameter or an elaborated-type-specifier.
421 // We have to look further.
428 switch (GetLookAheadToken(2).getKind()) {
432 case tok::greatergreater:
440 if (Tok.isNot(tok::kw_typename))
443 // C++ [temp.param]p2:
444 // There is no semantic difference between class and typename in a
445 // template-parameter. typename followed by an unqualified-id
446 // names a template type parameter. typename followed by a
447 // qualified-id denotes the type in a non-type
448 // parameter-declaration.
449 Token Next = NextToken();
451 // If we have an identifier, skip over it.
452 if (Next.getKind() == tok::identifier)
453 Next = GetLookAheadToken(2);
455 switch (Next.getKind()) {
459 case tok::greatergreater:
468 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
470 /// template-parameter: [C++ temp.param]
472 /// parameter-declaration
474 /// type-parameter: (see below)
475 /// 'class' ...[opt] identifier[opt]
476 /// 'class' identifier[opt] '=' type-id
477 /// 'typename' ...[opt] identifier[opt]
478 /// 'typename' identifier[opt] '=' type-id
479 /// 'template' '<' template-parameter-list '>'
480 /// 'class' ...[opt] identifier[opt]
481 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
483 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
484 if (isStartOfTemplateTypeParameter())
485 return ParseTypeParameter(Depth, Position);
487 if (Tok.is(tok::kw_template))
488 return ParseTemplateTemplateParameter(Depth, Position);
490 // If it's none of the above, then it must be a parameter declaration.
491 // NOTE: This will pick up errors in the closure of the template parameter
492 // list (e.g., template < ; Check here to implement >> style closures.
493 return ParseNonTypeTemplateParameter(Depth, Position);
496 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
497 /// Other kinds of template parameters are parsed in
498 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
500 /// type-parameter: [C++ temp.param]
501 /// 'class' ...[opt][C++0x] identifier[opt]
502 /// 'class' identifier[opt] '=' type-id
503 /// 'typename' ...[opt][C++0x] identifier[opt]
504 /// 'typename' identifier[opt] '=' type-id
505 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
506 assert(Tok.isOneOf(tok::kw_class, tok::kw_typename) &&
507 "A type-parameter starts with 'class' or 'typename'");
509 // Consume the 'class' or 'typename' keyword.
510 bool TypenameKeyword = Tok.is(tok::kw_typename);
511 SourceLocation KeyLoc = ConsumeToken();
513 // Grab the ellipsis (if given).
514 SourceLocation EllipsisLoc;
515 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
517 getLangOpts().CPlusPlus11
518 ? diag::warn_cxx98_compat_variadic_templates
519 : diag::ext_variadic_templates);
522 // Grab the template parameter name (if given)
523 SourceLocation NameLoc;
524 IdentifierInfo *ParamName = nullptr;
525 if (Tok.is(tok::identifier)) {
526 ParamName = Tok.getIdentifierInfo();
527 NameLoc = ConsumeToken();
528 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
529 tok::greatergreater)) {
530 // Unnamed template parameter. Don't have to do anything here, just
531 // don't consume this token.
533 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
537 // Recover from misplaced ellipsis.
538 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
539 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
540 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
542 // Grab a default argument (if available).
543 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
544 // we introduce the type parameter into the local scope.
545 SourceLocation EqualLoc;
546 ParsedType DefaultArg;
547 if (TryConsumeToken(tok::equal, EqualLoc))
548 DefaultArg = ParseTypeName(/*Range=*/nullptr,
549 Declarator::TemplateTypeArgContext).get();
551 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
552 KeyLoc, ParamName, NameLoc, Depth, Position,
553 EqualLoc, DefaultArg);
556 /// ParseTemplateTemplateParameter - Handle the parsing of template
557 /// template parameters.
559 /// type-parameter: [C++ temp.param]
560 /// 'template' '<' template-parameter-list '>' type-parameter-key
561 /// ...[opt] identifier[opt]
562 /// 'template' '<' template-parameter-list '>' type-parameter-key
563 /// identifier[opt] = id-expression
564 /// type-parameter-key:
566 /// 'typename' [C++1z]
568 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
569 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
571 // Handle the template <...> part.
572 SourceLocation TemplateLoc = ConsumeToken();
573 SmallVector<NamedDecl*,8> TemplateParams;
574 SourceLocation LAngleLoc, RAngleLoc;
576 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
577 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
583 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
584 // Generate a meaningful error if the user forgot to put class before the
585 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
586 // or greater appear immediately or after 'struct'. In the latter case,
587 // replace the keyword with 'class'.
588 if (!TryConsumeToken(tok::kw_class)) {
589 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
590 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
591 if (Tok.is(tok::kw_typename)) {
592 Diag(Tok.getLocation(),
593 getLangOpts().CPlusPlus17
594 ? diag::warn_cxx14_compat_template_template_param_typename
595 : diag::ext_template_template_param_typename)
596 << (!getLangOpts().CPlusPlus17
597 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
599 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
600 tok::greatergreater, tok::ellipsis)) {
601 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
602 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
603 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
605 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
611 // Parse the ellipsis, if given.
612 SourceLocation EllipsisLoc;
613 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
615 getLangOpts().CPlusPlus11
616 ? diag::warn_cxx98_compat_variadic_templates
617 : diag::ext_variadic_templates);
619 // Get the identifier, if given.
620 SourceLocation NameLoc;
621 IdentifierInfo *ParamName = nullptr;
622 if (Tok.is(tok::identifier)) {
623 ParamName = Tok.getIdentifierInfo();
624 NameLoc = ConsumeToken();
625 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
626 tok::greatergreater)) {
627 // Unnamed template parameter. Don't have to do anything here, just
628 // don't consume this token.
630 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
634 // Recover from misplaced ellipsis.
635 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
636 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
637 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
639 TemplateParameterList *ParamList =
640 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
641 TemplateLoc, LAngleLoc,
645 // Grab a default argument (if available).
646 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
647 // we introduce the template parameter into the local scope.
648 SourceLocation EqualLoc;
649 ParsedTemplateArgument DefaultArg;
650 if (TryConsumeToken(tok::equal, EqualLoc)) {
651 DefaultArg = ParseTemplateTemplateArgument();
652 if (DefaultArg.isInvalid()) {
653 Diag(Tok.getLocation(),
654 diag::err_default_template_template_parameter_not_template);
655 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
656 StopAtSemi | StopBeforeMatch);
660 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
661 ParamList, EllipsisLoc,
662 ParamName, NameLoc, Depth,
663 Position, EqualLoc, DefaultArg);
666 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
667 /// template parameters (e.g., in "template<int Size> class array;").
669 /// template-parameter:
671 /// parameter-declaration
673 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
674 // Parse the declaration-specifiers (i.e., the type).
675 // FIXME: The type should probably be restricted in some way... Not all
676 // declarators (parts of declarators?) are accepted for parameters.
677 DeclSpec DS(AttrFactory);
678 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
681 // Parse this as a typename.
682 Declarator ParamDecl(DS, Declarator::TemplateParamContext);
683 ParseDeclarator(ParamDecl);
684 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
685 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
689 // Recover from misplaced ellipsis.
690 SourceLocation EllipsisLoc;
691 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
692 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
694 // If there is a default value, parse it.
695 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
696 // we introduce the template parameter into the local scope.
697 SourceLocation EqualLoc;
698 ExprResult DefaultArg;
699 if (TryConsumeToken(tok::equal, EqualLoc)) {
700 // C++ [temp.param]p15:
701 // When parsing a default template-argument for a non-type
702 // template-parameter, the first non-nested > is taken as the
703 // end of the template-parameter-list rather than a greater-than
705 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
706 EnterExpressionEvaluationContext ConstantEvaluated(
707 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
709 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
710 if (DefaultArg.isInvalid())
711 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
714 // Create the parameter.
715 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
716 Depth, Position, EqualLoc,
720 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
721 SourceLocation CorrectLoc,
722 bool AlreadyHasEllipsis,
723 bool IdentifierHasName) {
725 if (!AlreadyHasEllipsis)
726 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
727 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
728 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
729 << !IdentifierHasName;
732 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
734 assert(EllipsisLoc.isValid());
735 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
736 if (!AlreadyHasEllipsis)
737 D.setEllipsisLoc(EllipsisLoc);
738 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
739 AlreadyHasEllipsis, D.hasName());
742 /// \brief Parses a '>' at the end of a template list.
744 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
745 /// to determine if these tokens were supposed to be a '>' followed by
746 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
748 /// \param RAngleLoc the location of the consumed '>'.
750 /// \param ConsumeLastToken if true, the '>' is consumed.
752 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
753 /// type parameter or type argument list, rather than a C++ template parameter
754 /// or argument list.
756 /// \returns true, if current token does not start with '>', false otherwise.
757 bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
758 bool ConsumeLastToken,
759 bool ObjCGenericList) {
760 // What will be left once we've consumed the '>'.
761 tok::TokenKind RemainingToken;
762 const char *ReplacementStr = "> >";
764 switch (Tok.getKind()) {
766 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
770 // Determine the location of the '>' token. Only consume this token
771 // if the caller asked us to.
772 RAngleLoc = Tok.getLocation();
773 if (ConsumeLastToken)
777 case tok::greatergreater:
778 RemainingToken = tok::greater;
781 case tok::greatergreatergreater:
782 RemainingToken = tok::greatergreater;
785 case tok::greaterequal:
786 RemainingToken = tok::equal;
787 ReplacementStr = "> =";
790 case tok::greatergreaterequal:
791 RemainingToken = tok::greaterequal;
795 // This template-id is terminated by a token which starts with a '>'. Outside
796 // C++11, this is now error recovery, and in C++11, this is error recovery if
797 // the token isn't '>>' or '>>>'.
798 // '>>>' is for CUDA, where this sequence of characters is parsed into
799 // tok::greatergreatergreater, rather than two separate tokens.
801 // We always allow this for Objective-C type parameter and type argument
803 RAngleLoc = Tok.getLocation();
804 Token Next = NextToken();
805 if (!ObjCGenericList) {
806 // The source range of the '>>' or '>=' at the start of the token.
807 CharSourceRange ReplacementRange =
808 CharSourceRange::getCharRange(RAngleLoc,
809 Lexer::AdvanceToTokenCharacter(RAngleLoc, 2, PP.getSourceManager(),
812 // A hint to put a space between the '>>'s. In order to make the hint as
813 // clear as possible, we include the characters either side of the space in
814 // the replacement, rather than just inserting a space at SecondCharLoc.
815 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
818 // A hint to put another space after the token, if it would otherwise be
819 // lexed differently.
821 if ((RemainingToken == tok::greater ||
822 RemainingToken == tok::greatergreater) &&
823 (Next.isOneOf(tok::greater, tok::greatergreater,
824 tok::greatergreatergreater, tok::equal,
825 tok::greaterequal, tok::greatergreaterequal,
827 areTokensAdjacent(Tok, Next))
828 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
830 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
831 if (getLangOpts().CPlusPlus11 &&
832 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
833 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
834 else if (Tok.is(tok::greaterequal))
835 DiagId = diag::err_right_angle_bracket_equal_needs_space;
836 Diag(Tok.getLocation(), DiagId) << Hint1 << Hint2;
839 // Strip the initial '>' from the token.
841 if (RemainingToken == tok::equal && Next.is(tok::equal) &&
842 areTokensAdjacent(Tok, Next)) {
843 // Join two adjacent '=' tokens into one, for cases like:
844 // void (*p)() = f<int>;
847 Tok.setKind(tok::equalequal);
848 Tok.setLength(Tok.getLength() + 1);
850 Tok.setKind(RemainingToken);
851 Tok.setLength(Tok.getLength() - 1);
853 Tok.setLocation(Lexer::AdvanceToTokenCharacter(RAngleLoc, 1,
854 PP.getSourceManager(),
857 // The advance from '>>' to '>' in a ObjectiveC template argument list needs
858 // to be properly reflected in the token cache to allow correct interaction
859 // between annotation and backtracking.
860 if (ObjCGenericList && PrevTok.getKind() == tok::greatergreater &&
861 RemainingToken == tok::greater && PP.IsPreviousCachedToken(PrevTok)) {
862 PrevTok.setKind(RemainingToken);
863 PrevTok.setLength(1);
864 // Break tok::greatergreater into two tok::greater but only add the second
865 // one in case the client asks to consume the last token.
866 if (ConsumeLastToken)
867 PP.ReplacePreviousCachedToken({PrevTok, Tok});
869 PP.ReplacePreviousCachedToken({PrevTok});
872 if (!ConsumeLastToken) {
873 // Since we're not supposed to consume the '>' token, we need to push
874 // this token and revert the current token back to the '>'.
876 Tok.setKind(tok::greater);
878 Tok.setLocation(RAngleLoc);
884 /// \brief Parses a template-id that after the template name has
885 /// already been parsed.
887 /// This routine takes care of parsing the enclosed template argument
888 /// list ('<' template-parameter-list [opt] '>') and placing the
889 /// results into a form that can be transferred to semantic analysis.
891 /// \param ConsumeLastToken if true, then we will consume the last
892 /// token that forms the template-id. Otherwise, we will leave the
893 /// last token in the stream (e.g., so that it can be replaced with an
894 /// annotation token).
896 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
897 SourceLocation &LAngleLoc,
898 TemplateArgList &TemplateArgs,
899 SourceLocation &RAngleLoc) {
900 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
903 LAngleLoc = ConsumeToken();
905 // Parse the optional template-argument-list.
906 bool Invalid = false;
908 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
909 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
910 Invalid = ParseTemplateArgumentList(TemplateArgs);
913 // Try to find the closing '>'.
914 if (ConsumeLastToken)
915 SkipUntil(tok::greater, StopAtSemi);
917 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
922 return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken,
923 /*ObjCGenericList=*/false);
926 /// \brief Replace the tokens that form a simple-template-id with an
927 /// annotation token containing the complete template-id.
929 /// The first token in the stream must be the name of a template that
930 /// is followed by a '<'. This routine will parse the complete
931 /// simple-template-id and replace the tokens with a single annotation
932 /// token with one of two different kinds: if the template-id names a
933 /// type (and \p AllowTypeAnnotation is true), the annotation token is
934 /// a type annotation that includes the optional nested-name-specifier
935 /// (\p SS). Otherwise, the annotation token is a template-id
936 /// annotation that does not include the optional
937 /// nested-name-specifier.
939 /// \param Template the declaration of the template named by the first
940 /// token (an identifier), as returned from \c Action::isTemplateName().
942 /// \param TNK the kind of template that \p Template
943 /// refers to, as returned from \c Action::isTemplateName().
945 /// \param SS if non-NULL, the nested-name-specifier that precedes
946 /// this template name.
948 /// \param TemplateKWLoc if valid, specifies that this template-id
949 /// annotation was preceded by the 'template' keyword and gives the
950 /// location of that keyword. If invalid (the default), then this
951 /// template-id was not preceded by a 'template' keyword.
953 /// \param AllowTypeAnnotation if true (the default), then a
954 /// simple-template-id that refers to a class template, template
955 /// template parameter, or other template that produces a type will be
956 /// replaced with a type annotation token. Otherwise, the
957 /// simple-template-id is always replaced with a template-id
958 /// annotation token.
960 /// If an unrecoverable parse error occurs and no annotation token can be
961 /// formed, this function returns true.
963 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
965 SourceLocation TemplateKWLoc,
966 UnqualifiedId &TemplateName,
967 bool AllowTypeAnnotation) {
968 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
969 assert(Template && Tok.is(tok::less) &&
970 "Parser isn't at the beginning of a template-id");
972 // Consume the template-name.
973 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
975 // Parse the enclosed template argument list.
976 SourceLocation LAngleLoc, RAngleLoc;
977 TemplateArgList TemplateArgs;
978 bool Invalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
983 // If we failed to parse the template ID but skipped ahead to a >, we're not
984 // going to be able to form a token annotation. Eat the '>' if present.
985 TryConsumeToken(tok::greater);
989 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
991 // Build the annotation token.
992 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
993 TypeResult Type = Actions.ActOnTemplateIdType(
994 SS, TemplateKWLoc, Template, TemplateName.Identifier,
995 TemplateNameLoc, LAngleLoc, TemplateArgsPtr, RAngleLoc);
996 if (Type.isInvalid()) {
997 // If we failed to parse the template ID but skipped ahead to a >, we're
998 // not going to be able to form a token annotation. Eat the '>' if
1000 TryConsumeToken(tok::greater);
1004 Tok.setKind(tok::annot_typename);
1005 setTypeAnnotation(Tok, Type.get());
1006 if (SS.isNotEmpty())
1007 Tok.setLocation(SS.getBeginLoc());
1008 else if (TemplateKWLoc.isValid())
1009 Tok.setLocation(TemplateKWLoc);
1011 Tok.setLocation(TemplateNameLoc);
1013 // Build a template-id annotation token that can be processed
1015 Tok.setKind(tok::annot_template_id);
1017 IdentifierInfo *TemplateII =
1018 TemplateName.getKind() == UnqualifiedId::IK_Identifier
1019 ? TemplateName.Identifier
1022 OverloadedOperatorKind OpKind =
1023 TemplateName.getKind() == UnqualifiedId::IK_Identifier
1025 : TemplateName.OperatorFunctionId.Operator;
1027 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
1028 SS, TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1029 LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
1031 Tok.setAnnotationValue(TemplateId);
1032 if (TemplateKWLoc.isValid())
1033 Tok.setLocation(TemplateKWLoc);
1035 Tok.setLocation(TemplateNameLoc);
1038 // Common fields for the annotation token
1039 Tok.setAnnotationEndLoc(RAngleLoc);
1041 // In case the tokens were cached, have Preprocessor replace them with the
1042 // annotation token.
1043 PP.AnnotateCachedTokens(Tok);
1047 /// \brief Replaces a template-id annotation token with a type
1048 /// annotation token.
1050 /// If there was a failure when forming the type from the template-id,
1051 /// a type annotation token will still be created, but will have a
1052 /// NULL type pointer to signify an error.
1054 /// \param IsClassName Is this template-id appearing in a context where we
1055 /// know it names a class, such as in an elaborated-type-specifier or
1056 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
1057 /// in those contexts.)
1058 void Parser::AnnotateTemplateIdTokenAsType(bool IsClassName) {
1059 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1061 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1062 assert((TemplateId->Kind == TNK_Type_template ||
1063 TemplateId->Kind == TNK_Dependent_template_name) &&
1064 "Only works for type and dependent templates");
1066 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1067 TemplateId->NumArgs);
1070 = Actions.ActOnTemplateIdType(TemplateId->SS,
1071 TemplateId->TemplateKWLoc,
1072 TemplateId->Template,
1074 TemplateId->TemplateNameLoc,
1075 TemplateId->LAngleLoc,
1077 TemplateId->RAngleLoc,
1078 /*IsCtorOrDtorName*/false,
1080 // Create the new "type" annotation token.
1081 Tok.setKind(tok::annot_typename);
1082 setTypeAnnotation(Tok, Type.isInvalid() ? nullptr : Type.get());
1083 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
1084 Tok.setLocation(TemplateId->SS.getBeginLoc());
1085 // End location stays the same
1087 // Replace the template-id annotation token, and possible the scope-specifier
1088 // that precedes it, with the typename annotation token.
1089 PP.AnnotateCachedTokens(Tok);
1092 /// \brief Determine whether the given token can end a template argument.
1093 static bool isEndOfTemplateArgument(Token Tok) {
1094 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater);
1097 /// \brief Parse a C++ template template argument.
1098 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1099 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1100 !Tok.is(tok::annot_cxxscope))
1101 return ParsedTemplateArgument();
1103 // C++0x [temp.arg.template]p1:
1104 // A template-argument for a template template-parameter shall be the name
1105 // of a class template or an alias template, expressed as id-expression.
1107 // We parse an id-expression that refers to a class template or alias
1108 // template. The grammar we parse is:
1110 // nested-name-specifier[opt] template[opt] identifier ...[opt]
1112 // followed by a token that terminates a template argument, such as ',',
1113 // '>', or (in some cases) '>>'.
1114 CXXScopeSpec SS; // nested-name-specifier, if present
1115 ParseOptionalCXXScopeSpecifier(SS, nullptr,
1116 /*EnteringContext=*/false);
1118 ParsedTemplateArgument Result;
1119 SourceLocation EllipsisLoc;
1120 if (SS.isSet() && Tok.is(tok::kw_template)) {
1121 // Parse the optional 'template' keyword following the
1122 // nested-name-specifier.
1123 SourceLocation TemplateKWLoc = ConsumeToken();
1125 if (Tok.is(tok::identifier)) {
1126 // We appear to have a dependent template name.
1128 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1129 ConsumeToken(); // the identifier
1131 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1133 // If the next token signals the end of a template argument,
1134 // then we have a dependent template name that could be a template
1135 // template argument.
1136 TemplateTy Template;
1137 if (isEndOfTemplateArgument(Tok) &&
1138 Actions.ActOnDependentTemplateName(
1139 getCurScope(), SS, TemplateKWLoc, Name,
1140 /*ObjectType=*/nullptr,
1141 /*EnteringContext=*/false, Template))
1142 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1144 } else if (Tok.is(tok::identifier)) {
1145 // We may have a (non-dependent) template name.
1146 TemplateTy Template;
1148 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1149 ConsumeToken(); // the identifier
1151 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1153 if (isEndOfTemplateArgument(Tok)) {
1154 bool MemberOfUnknownSpecialization;
1155 TemplateNameKind TNK = Actions.isTemplateName(
1157 /*hasTemplateKeyword=*/false, Name,
1158 /*ObjectType=*/nullptr,
1159 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1160 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1161 // We have an id-expression that refers to a class template or
1162 // (C++0x) alias template.
1163 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1168 // If this is a pack expansion, build it as such.
1169 if (EllipsisLoc.isValid() && !Result.isInvalid())
1170 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1175 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1177 /// template-argument: [C++ 14.2]
1178 /// constant-expression
1181 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1182 // C++ [temp.arg]p2:
1183 // In a template-argument, an ambiguity between a type-id and an
1184 // expression is resolved to a type-id, regardless of the form of
1185 // the corresponding template-parameter.
1187 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1188 // up and annotate an identifier as an id-expression during disambiguation,
1189 // so enter the appropriate context for a constant expression template
1190 // argument before trying to disambiguate.
1192 EnterExpressionEvaluationContext EnterConstantEvaluated(
1193 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1194 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1195 SourceLocation Loc = Tok.getLocation();
1196 TypeResult TypeArg = ParseTypeName(/*Range=*/nullptr,
1197 Declarator::TemplateTypeArgContext);
1198 if (TypeArg.isInvalid())
1199 return ParsedTemplateArgument();
1201 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1202 TypeArg.get().getAsOpaquePtr(),
1206 // Try to parse a template template argument.
1208 TentativeParsingAction TPA(*this);
1210 ParsedTemplateArgument TemplateTemplateArgument
1211 = ParseTemplateTemplateArgument();
1212 if (!TemplateTemplateArgument.isInvalid()) {
1214 return TemplateTemplateArgument;
1217 // Revert this tentative parse to parse a non-type template argument.
1221 // Parse a non-type template argument.
1222 SourceLocation Loc = Tok.getLocation();
1223 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
1224 if (ExprArg.isInvalid() || !ExprArg.get())
1225 return ParsedTemplateArgument();
1227 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1228 ExprArg.get(), Loc);
1231 /// \brief Determine whether the current tokens can only be parsed as a
1232 /// template argument list (starting with the '<') and never as a '<'
1234 bool Parser::IsTemplateArgumentList(unsigned Skip) {
1235 struct AlwaysRevertAction : TentativeParsingAction {
1236 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1237 ~AlwaysRevertAction() { Revert(); }
1246 if (!TryConsumeToken(tok::less))
1249 // An empty template argument list.
1250 if (Tok.is(tok::greater))
1253 // See whether we have declaration specifiers, which indicate a type.
1254 while (isCXXDeclarationSpecifier() == TPResult::True)
1257 // If we have a '>' or a ',' then this is a template argument list.
1258 return Tok.isOneOf(tok::greater, tok::comma);
1261 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1262 /// (C++ [temp.names]). Returns true if there was an error.
1264 /// template-argument-list: [C++ 14.2]
1265 /// template-argument
1266 /// template-argument-list ',' template-argument
1268 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1270 ColonProtectionRAIIObject ColonProtection(*this, false);
1273 ParsedTemplateArgument Arg = ParseTemplateArgument();
1274 SourceLocation EllipsisLoc;
1275 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1276 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1278 if (Arg.isInvalid()) {
1279 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1283 // Save this template argument.
1284 TemplateArgs.push_back(Arg);
1286 // If the next token is a comma, consume it and keep reading
1288 } while (TryConsumeToken(tok::comma));
1293 /// \brief Parse a C++ explicit template instantiation
1294 /// (C++ [temp.explicit]).
1296 /// explicit-instantiation:
1297 /// 'extern' [opt] 'template' declaration
1299 /// Note that the 'extern' is a GNU extension and C++11 feature.
1300 Decl *Parser::ParseExplicitInstantiation(unsigned Context,
1301 SourceLocation ExternLoc,
1302 SourceLocation TemplateLoc,
1303 SourceLocation &DeclEnd,
1304 AccessSpecifier AS) {
1305 // This isn't really required here.
1306 ParsingDeclRAIIObject
1307 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1309 return ParseSingleDeclarationAfterTemplate(Context,
1310 ParsedTemplateInfo(ExternLoc,
1312 ParsingTemplateParams,
1316 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1318 return getTemplateParamsRange(TemplateParams->data(),
1319 TemplateParams->size());
1321 SourceRange R(TemplateLoc);
1322 if (ExternLoc.isValid())
1323 R.setBegin(ExternLoc);
1327 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1328 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1331 /// \brief Late parse a C++ function template in Microsoft mode.
1332 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1336 // Get the FunctionDecl.
1337 FunctionDecl *FunD = LPT.D->getAsFunction();
1338 // Track template parameter depth.
1339 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1341 // To restore the context after late parsing.
1342 Sema::ContextRAII GlobalSavedContext(
1343 Actions, Actions.Context.getTranslationUnitDecl());
1345 SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1347 // Get the list of DeclContexts to reenter.
1348 SmallVector<DeclContext*, 4> DeclContextsToReenter;
1349 DeclContext *DD = FunD;
1350 while (DD && !DD->isTranslationUnit()) {
1351 DeclContextsToReenter.push_back(DD);
1352 DD = DD->getLexicalParent();
1355 // Reenter template scopes from outermost to innermost.
1356 SmallVectorImpl<DeclContext *>::reverse_iterator II =
1357 DeclContextsToReenter.rbegin();
1358 for (; II != DeclContextsToReenter.rend(); ++II) {
1359 TemplateParamScopeStack.push_back(new ParseScope(this,
1360 Scope::TemplateParamScope));
1361 unsigned NumParamLists =
1362 Actions.ActOnReenterTemplateScope(getCurScope(), cast<Decl>(*II));
1363 CurTemplateDepthTracker.addDepth(NumParamLists);
1365 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1366 Actions.PushDeclContext(Actions.getCurScope(), *II);
1370 assert(!LPT.Toks.empty() && "Empty body!");
1372 // Append the current token at the end of the new token stream so that it
1373 // doesn't get lost.
1374 LPT.Toks.push_back(Tok);
1375 PP.EnterTokenStream(LPT.Toks, true);
1377 // Consume the previously pushed token.
1378 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1379 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1380 "Inline method not starting with '{', ':' or 'try'");
1382 // Parse the method body. Function body parsing code is similar enough
1383 // to be re-used for method bodies as well.
1384 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
1385 Scope::CompoundStmtScope);
1387 // Recreate the containing function DeclContext.
1388 Sema::ContextRAII FunctionSavedContext(Actions,
1389 Actions.getContainingDC(FunD));
1391 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1393 if (Tok.is(tok::kw_try)) {
1394 ParseFunctionTryBlock(LPT.D, FnScope);
1396 if (Tok.is(tok::colon))
1397 ParseConstructorInitializer(LPT.D);
1399 Actions.ActOnDefaultCtorInitializers(LPT.D);
1401 if (Tok.is(tok::l_brace)) {
1402 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
1403 cast<FunctionTemplateDecl>(LPT.D)
1404 ->getTemplateParameters()
1405 ->getDepth() == TemplateParameterDepth - 1) &&
1406 "TemplateParameterDepth should be greater than the depth of "
1407 "current template being instantiated!");
1408 ParseFunctionStatementBody(LPT.D, FnScope);
1409 Actions.UnmarkAsLateParsedTemplate(FunD);
1411 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1416 SmallVectorImpl<ParseScope *>::reverse_iterator I =
1417 TemplateParamScopeStack.rbegin();
1418 for (; I != TemplateParamScopeStack.rend(); ++I)
1422 /// \brief Lex a delayed template function for late parsing.
1423 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1424 tok::TokenKind kind = Tok.getKind();
1425 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1426 // Consume everything up to (and including) the matching right brace.
1427 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1430 // If we're in a function-try-block, we need to store all the catch blocks.
1431 if (kind == tok::kw_try) {
1432 while (Tok.is(tok::kw_catch)) {
1433 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1434 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);