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 "RAIIObjectsForParser.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/Parse/ParseDiagnostic.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.h"
22 #include "clang/Sema/Scope.h"
23 using namespace clang;
25 /// \brief Parse a template declaration, explicit instantiation, or
26 /// explicit specialization.
28 Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
29 SourceLocation &DeclEnd,
31 AttributeList *AccessAttrs) {
32 ObjCDeclContextSwitch ObjCDC(*this);
34 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
35 return ParseExplicitInstantiation(Context,
36 SourceLocation(), ConsumeToken(),
39 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
45 /// \brief Parse a template declaration or an explicit specialization.
47 /// Template declarations include one or more template parameter lists
48 /// and either the function or class template declaration. Explicit
49 /// specializations contain one or more 'template < >' prefixes
50 /// followed by a (possibly templated) declaration. Since the
51 /// syntactic form of both features is nearly identical, we parse all
52 /// of the template headers together and let semantic analysis sort
53 /// the declarations from the explicit specializations.
55 /// template-declaration: [C++ temp]
56 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
58 /// explicit-specialization: [ C++ temp.expl.spec]
59 /// 'template' '<' '>' declaration
61 Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
62 SourceLocation &DeclEnd,
64 AttributeList *AccessAttrs) {
65 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
66 "Token does not start a template declaration.");
68 // Enter template-parameter scope.
69 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
71 // Tell the action that names should be checked in the context of
72 // the declaration to come.
74 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
76 // Parse multiple levels of template headers within this template
77 // parameter scope, e.g.,
79 // template<typename T>
80 // template<typename U>
81 // class A<T>::B { ... };
83 // We parse multiple levels non-recursively so that we can build a
84 // single data structure containing all of the template parameter
85 // lists to easily differentiate between the case above and:
87 // template<typename T>
89 // template<typename U> class B;
92 // In the first case, the action for declaring A<T>::B receives
93 // both template parameter lists. In the second case, the action for
94 // defining A<T>::B receives just the inner template parameter list
95 // (and retrieves the outer template parameter list from its
97 bool isSpecialization = true;
98 bool LastParamListWasEmpty = false;
99 TemplateParameterLists ParamLists;
100 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
103 // Consume the 'export', if any.
104 SourceLocation ExportLoc;
105 TryConsumeToken(tok::kw_export, ExportLoc);
107 // Consume the 'template', which should be here.
108 SourceLocation TemplateLoc;
109 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
110 Diag(Tok.getLocation(), diag::err_expected_template);
114 // Parse the '<' template-parameter-list '>'
115 SourceLocation LAngleLoc, RAngleLoc;
116 SmallVector<Decl*, 4> TemplateParams;
117 if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
118 TemplateParams, LAngleLoc, RAngleLoc)) {
119 // Skip until the semi-colon or a '}'.
120 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
121 TryConsumeToken(tok::semi);
125 ParamLists.push_back(
126 Actions.ActOnTemplateParameterList(CurTemplateDepthTracker.getDepth(),
128 TemplateLoc, LAngleLoc,
129 TemplateParams.data(),
130 TemplateParams.size(), RAngleLoc));
132 if (!TemplateParams.empty()) {
133 isSpecialization = false;
134 ++CurTemplateDepthTracker;
136 if (TryConsumeToken(tok::kw_requires)) {
138 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
139 if (!ER.isUsable()) {
140 // Skip until the semi-colon or a '}'.
141 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
142 TryConsumeToken(tok::semi);
147 LastParamListWasEmpty = true;
149 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
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 return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
203 // Parse the declaration specifiers, stealing any diagnostics from
204 // the template parameters.
205 ParsingDeclSpec DS(*this, &DiagsFromTParams);
207 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
208 getDeclSpecContextFromDeclaratorContext(Context));
210 if (Tok.is(tok::semi)) {
211 ProhibitAttributes(prefixAttrs);
212 DeclEnd = ConsumeToken();
213 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
214 getCurScope(), AS, DS,
215 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
216 : MultiTemplateParamsArg(),
217 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation);
222 // Move the attributes from the prefix into the DS.
223 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
224 ProhibitAttributes(prefixAttrs);
226 DS.takeAttributesFrom(prefixAttrs);
228 // Parse the declarator.
229 ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
230 ParseDeclarator(DeclaratorInfo);
231 // Error parsing the declarator?
232 if (!DeclaratorInfo.hasName()) {
233 // If so, skip until the semi-colon or a }.
234 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
235 if (Tok.is(tok::semi))
240 LateParsedAttrList LateParsedAttrs(true);
241 if (DeclaratorInfo.isFunctionDeclarator())
242 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
244 if (DeclaratorInfo.isFunctionDeclarator() &&
245 isStartOfFunctionDefinition(DeclaratorInfo)) {
247 // Function definitions are only allowed at file scope and in C++ classes.
248 // The C++ inline method definition case is handled elsewhere, so we only
249 // need to handle the file scope definition case.
250 if (Context != Declarator::FileContext) {
251 Diag(Tok, diag::err_function_definition_not_allowed);
256 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
257 // Recover by ignoring the 'typedef'. This was probably supposed to be
258 // the 'typename' keyword, which we should have already suggested adding
259 // if it's appropriate.
260 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
261 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
262 DS.ClearStorageClassSpecs();
265 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
266 if (DeclaratorInfo.getName().getKind() != UnqualifiedId::IK_TemplateId) {
267 // If the declarator-id is not a template-id, issue a diagnostic and
268 // recover by ignoring the 'template' keyword.
269 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
270 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
273 SourceLocation LAngleLoc
274 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
275 Diag(DeclaratorInfo.getIdentifierLoc(),
276 diag::err_explicit_instantiation_with_definition)
277 << SourceRange(TemplateInfo.TemplateLoc)
278 << FixItHint::CreateInsertion(LAngleLoc, "<>");
280 // Recover as if it were an explicit specialization.
281 TemplateParameterLists FakedParamLists;
282 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
283 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, nullptr,
286 return ParseFunctionDefinition(
287 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
288 /*isSpecialization=*/true,
289 /*LastParamListWasEmpty=*/true),
293 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
297 // Parse this declaration.
298 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
301 if (Tok.is(tok::comma)) {
302 Diag(Tok, diag::err_multiple_template_declarators)
303 << (int)TemplateInfo.Kind;
304 SkipUntil(tok::semi);
308 // Eat the semi colon after the declaration.
309 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
310 if (LateParsedAttrs.size() > 0)
311 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
312 DeclaratorInfo.complete(ThisDecl);
316 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
317 /// angle brackets. Depth is the depth of this template-parameter-list, which
318 /// is the number of template headers directly enclosing this template header.
319 /// TemplateParams is the current list of template parameters we're building.
320 /// The template parameter we parse will be added to this list. LAngleLoc and
321 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
322 /// that enclose this template parameter list.
324 /// \returns true if an error occurred, false otherwise.
325 bool Parser::ParseTemplateParameters(unsigned Depth,
326 SmallVectorImpl<Decl*> &TemplateParams,
327 SourceLocation &LAngleLoc,
328 SourceLocation &RAngleLoc) {
329 // Get the template parameter list.
330 if (!TryConsumeToken(tok::less, LAngleLoc)) {
331 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
335 // Try to parse the template parameter list.
337 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
338 Failed = ParseTemplateParameterList(Depth, TemplateParams);
340 if (Tok.is(tok::greatergreater)) {
341 // No diagnostic required here: a template-parameter-list can only be
342 // followed by a declaration or, for a template template parameter, the
343 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
344 // This matters for elegant diagnosis of:
345 // template<template<typename>> struct S;
346 Tok.setKind(tok::greater);
347 RAngleLoc = Tok.getLocation();
348 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
349 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
350 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
356 /// ParseTemplateParameterList - Parse a template parameter list. If
357 /// the parsing fails badly (i.e., closing bracket was left out), this
358 /// will try to put the token stream in a reasonable position (closing
359 /// a statement, etc.) and return false.
361 /// template-parameter-list: [C++ temp]
362 /// template-parameter
363 /// template-parameter-list ',' template-parameter
365 Parser::ParseTemplateParameterList(unsigned Depth,
366 SmallVectorImpl<Decl*> &TemplateParams) {
369 = ParseTemplateParameter(Depth, TemplateParams.size())) {
370 TemplateParams.push_back(TmpParam);
372 // If we failed to parse a template parameter, skip until we find
373 // a comma or closing brace.
374 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
375 StopAtSemi | StopBeforeMatch);
378 // Did we find a comma or the end of the template parameter list?
379 if (Tok.is(tok::comma)) {
381 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
382 // Don't consume this... that's done by template parser.
385 // Somebody probably forgot to close the template. Skip ahead and
386 // try to get out of the expression. This error is currently
387 // subsumed by whatever goes on in ParseTemplateParameter.
388 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
389 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
390 StopAtSemi | StopBeforeMatch);
397 /// \brief Determine whether the parser is at the start of a template
399 bool Parser::isStartOfTemplateTypeParameter() {
400 if (Tok.is(tok::kw_class)) {
401 // "class" may be the start of an elaborated-type-specifier or a
402 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
403 switch (NextToken().getKind()) {
407 case tok::greatergreater:
411 case tok::identifier:
412 // This may be either a type-parameter or an elaborated-type-specifier.
413 // We have to look further.
420 switch (GetLookAheadToken(2).getKind()) {
424 case tok::greatergreater:
432 if (Tok.isNot(tok::kw_typename))
435 // C++ [temp.param]p2:
436 // There is no semantic difference between class and typename in a
437 // template-parameter. typename followed by an unqualified-id
438 // names a template type parameter. typename followed by a
439 // qualified-id denotes the type in a non-type
440 // parameter-declaration.
441 Token Next = NextToken();
443 // If we have an identifier, skip over it.
444 if (Next.getKind() == tok::identifier)
445 Next = GetLookAheadToken(2);
447 switch (Next.getKind()) {
451 case tok::greatergreater:
460 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
462 /// template-parameter: [C++ temp.param]
464 /// parameter-declaration
466 /// type-parameter: (see below)
467 /// 'class' ...[opt] identifier[opt]
468 /// 'class' identifier[opt] '=' type-id
469 /// 'typename' ...[opt] identifier[opt]
470 /// 'typename' identifier[opt] '=' type-id
471 /// 'template' '<' template-parameter-list '>'
472 /// 'class' ...[opt] identifier[opt]
473 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
475 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
476 if (isStartOfTemplateTypeParameter())
477 return ParseTypeParameter(Depth, Position);
479 if (Tok.is(tok::kw_template))
480 return ParseTemplateTemplateParameter(Depth, Position);
482 // If it's none of the above, then it must be a parameter declaration.
483 // NOTE: This will pick up errors in the closure of the template parameter
484 // list (e.g., template < ; Check here to implement >> style closures.
485 return ParseNonTypeTemplateParameter(Depth, Position);
488 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
489 /// Other kinds of template parameters are parsed in
490 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
492 /// type-parameter: [C++ temp.param]
493 /// 'class' ...[opt][C++0x] identifier[opt]
494 /// 'class' identifier[opt] '=' type-id
495 /// 'typename' ...[opt][C++0x] identifier[opt]
496 /// 'typename' identifier[opt] '=' type-id
497 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
498 assert(Tok.isOneOf(tok::kw_class, tok::kw_typename) &&
499 "A type-parameter starts with 'class' or 'typename'");
501 // Consume the 'class' or 'typename' keyword.
502 bool TypenameKeyword = Tok.is(tok::kw_typename);
503 SourceLocation KeyLoc = ConsumeToken();
505 // Grab the ellipsis (if given).
506 SourceLocation EllipsisLoc;
507 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
509 getLangOpts().CPlusPlus11
510 ? diag::warn_cxx98_compat_variadic_templates
511 : diag::ext_variadic_templates);
514 // Grab the template parameter name (if given)
515 SourceLocation NameLoc;
516 IdentifierInfo *ParamName = nullptr;
517 if (Tok.is(tok::identifier)) {
518 ParamName = Tok.getIdentifierInfo();
519 NameLoc = ConsumeToken();
520 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
521 tok::greatergreater)) {
522 // Unnamed template parameter. Don't have to do anything here, just
523 // don't consume this token.
525 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
529 // Recover from misplaced ellipsis.
530 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
531 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
532 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
534 // Grab a default argument (if available).
535 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
536 // we introduce the type parameter into the local scope.
537 SourceLocation EqualLoc;
538 ParsedType DefaultArg;
539 if (TryConsumeToken(tok::equal, EqualLoc))
540 DefaultArg = ParseTypeName(/*Range=*/nullptr,
541 Declarator::TemplateTypeArgContext).get();
543 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
544 KeyLoc, ParamName, NameLoc, Depth, Position,
545 EqualLoc, DefaultArg);
548 /// ParseTemplateTemplateParameter - Handle the parsing of template
549 /// template parameters.
551 /// type-parameter: [C++ temp.param]
552 /// 'template' '<' template-parameter-list '>' type-parameter-key
553 /// ...[opt] identifier[opt]
554 /// 'template' '<' template-parameter-list '>' type-parameter-key
555 /// identifier[opt] = id-expression
556 /// type-parameter-key:
558 /// 'typename' [C++1z]
560 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
561 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
563 // Handle the template <...> part.
564 SourceLocation TemplateLoc = ConsumeToken();
565 SmallVector<Decl*,8> TemplateParams;
566 SourceLocation LAngleLoc, RAngleLoc;
568 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
569 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
575 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
576 // Generate a meaningful error if the user forgot to put class before the
577 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
578 // or greater appear immediately or after 'struct'. In the latter case,
579 // replace the keyword with 'class'.
580 if (!TryConsumeToken(tok::kw_class)) {
581 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
582 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
583 if (Tok.is(tok::kw_typename)) {
584 Diag(Tok.getLocation(),
585 getLangOpts().CPlusPlus1z
586 ? diag::warn_cxx14_compat_template_template_param_typename
587 : diag::ext_template_template_param_typename)
588 << (!getLangOpts().CPlusPlus1z
589 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
591 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
592 tok::greatergreater, tok::ellipsis)) {
593 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
594 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
595 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
597 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
603 // Parse the ellipsis, if given.
604 SourceLocation EllipsisLoc;
605 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
607 getLangOpts().CPlusPlus11
608 ? diag::warn_cxx98_compat_variadic_templates
609 : diag::ext_variadic_templates);
611 // Get the identifier, if given.
612 SourceLocation NameLoc;
613 IdentifierInfo *ParamName = nullptr;
614 if (Tok.is(tok::identifier)) {
615 ParamName = Tok.getIdentifierInfo();
616 NameLoc = ConsumeToken();
617 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
618 tok::greatergreater)) {
619 // Unnamed template parameter. Don't have to do anything here, just
620 // don't consume this token.
622 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
626 // Recover from misplaced ellipsis.
627 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
628 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
629 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
631 TemplateParameterList *ParamList =
632 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
633 TemplateLoc, LAngleLoc,
634 TemplateParams.data(),
635 TemplateParams.size(),
638 // Grab a default argument (if available).
639 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
640 // we introduce the template parameter into the local scope.
641 SourceLocation EqualLoc;
642 ParsedTemplateArgument DefaultArg;
643 if (TryConsumeToken(tok::equal, EqualLoc)) {
644 DefaultArg = ParseTemplateTemplateArgument();
645 if (DefaultArg.isInvalid()) {
646 Diag(Tok.getLocation(),
647 diag::err_default_template_template_parameter_not_template);
648 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
649 StopAtSemi | StopBeforeMatch);
653 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
654 ParamList, EllipsisLoc,
655 ParamName, NameLoc, Depth,
656 Position, EqualLoc, DefaultArg);
659 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
660 /// template parameters (e.g., in "template<int Size> class array;").
662 /// template-parameter:
664 /// parameter-declaration
666 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
667 // Parse the declaration-specifiers (i.e., the type).
668 // FIXME: The type should probably be restricted in some way... Not all
669 // declarators (parts of declarators?) are accepted for parameters.
670 DeclSpec DS(AttrFactory);
671 ParseDeclarationSpecifiers(DS);
673 // Parse this as a typename.
674 Declarator ParamDecl(DS, Declarator::TemplateParamContext);
675 ParseDeclarator(ParamDecl);
676 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
677 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
681 // Recover from misplaced ellipsis.
682 SourceLocation EllipsisLoc;
683 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
684 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
686 // If there is a default value, parse it.
687 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
688 // we introduce the template parameter into the local scope.
689 SourceLocation EqualLoc;
690 ExprResult DefaultArg;
691 if (TryConsumeToken(tok::equal, EqualLoc)) {
692 // C++ [temp.param]p15:
693 // When parsing a default template-argument for a non-type
694 // template-parameter, the first non-nested > is taken as the
695 // end of the template-parameter-list rather than a greater-than
697 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
698 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
700 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
701 if (DefaultArg.isInvalid())
702 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
705 // Create the parameter.
706 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
707 Depth, Position, EqualLoc,
711 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
712 SourceLocation CorrectLoc,
713 bool AlreadyHasEllipsis,
714 bool IdentifierHasName) {
716 if (!AlreadyHasEllipsis)
717 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
718 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
719 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
720 << !IdentifierHasName;
723 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
725 assert(EllipsisLoc.isValid());
726 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
727 if (!AlreadyHasEllipsis)
728 D.setEllipsisLoc(EllipsisLoc);
729 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
730 AlreadyHasEllipsis, D.hasName());
733 /// \brief Parses a '>' at the end of a template list.
735 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
736 /// to determine if these tokens were supposed to be a '>' followed by
737 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
739 /// \param RAngleLoc the location of the consumed '>'.
741 /// \param ConsumeLastToken if true, the '>' is consumed.
743 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
744 /// type parameter or type argument list, rather than a C++ template parameter
745 /// or argument list.
747 /// \returns true, if current token does not start with '>', false otherwise.
748 bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
749 bool ConsumeLastToken,
750 bool ObjCGenericList) {
751 // What will be left once we've consumed the '>'.
752 tok::TokenKind RemainingToken;
753 const char *ReplacementStr = "> >";
755 switch (Tok.getKind()) {
757 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
761 // Determine the location of the '>' token. Only consume this token
762 // if the caller asked us to.
763 RAngleLoc = Tok.getLocation();
764 if (ConsumeLastToken)
768 case tok::greatergreater:
769 RemainingToken = tok::greater;
772 case tok::greatergreatergreater:
773 RemainingToken = tok::greatergreater;
776 case tok::greaterequal:
777 RemainingToken = tok::equal;
778 ReplacementStr = "> =";
781 case tok::greatergreaterequal:
782 RemainingToken = tok::greaterequal;
786 // This template-id is terminated by a token which starts with a '>'. Outside
787 // C++11, this is now error recovery, and in C++11, this is error recovery if
788 // the token isn't '>>' or '>>>'.
789 // '>>>' is for CUDA, where this sequence of characters is parsed into
790 // tok::greatergreatergreater, rather than two separate tokens.
792 // We always allow this for Objective-C type parameter and type argument
794 RAngleLoc = Tok.getLocation();
795 Token Next = NextToken();
796 if (!ObjCGenericList) {
797 // The source range of the '>>' or '>=' at the start of the token.
798 CharSourceRange ReplacementRange =
799 CharSourceRange::getCharRange(RAngleLoc,
800 Lexer::AdvanceToTokenCharacter(RAngleLoc, 2, PP.getSourceManager(),
803 // A hint to put a space between the '>>'s. In order to make the hint as
804 // clear as possible, we include the characters either side of the space in
805 // the replacement, rather than just inserting a space at SecondCharLoc.
806 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
809 // A hint to put another space after the token, if it would otherwise be
810 // lexed differently.
812 if ((RemainingToken == tok::greater ||
813 RemainingToken == tok::greatergreater) &&
814 (Next.isOneOf(tok::greater, tok::greatergreater,
815 tok::greatergreatergreater, tok::equal,
816 tok::greaterequal, tok::greatergreaterequal,
818 areTokensAdjacent(Tok, Next))
819 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
821 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
822 if (getLangOpts().CPlusPlus11 &&
823 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
824 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
825 else if (Tok.is(tok::greaterequal))
826 DiagId = diag::err_right_angle_bracket_equal_needs_space;
827 Diag(Tok.getLocation(), DiagId) << Hint1 << Hint2;
830 // Strip the initial '>' from the token.
831 if (RemainingToken == tok::equal && Next.is(tok::equal) &&
832 areTokensAdjacent(Tok, Next)) {
833 // Join two adjacent '=' tokens into one, for cases like:
834 // void (*p)() = f<int>;
837 Tok.setKind(tok::equalequal);
838 Tok.setLength(Tok.getLength() + 1);
840 Tok.setKind(RemainingToken);
841 Tok.setLength(Tok.getLength() - 1);
843 Tok.setLocation(Lexer::AdvanceToTokenCharacter(RAngleLoc, 1,
844 PP.getSourceManager(),
847 if (!ConsumeLastToken) {
848 // Since we're not supposed to consume the '>' token, we need to push
849 // this token and revert the current token back to the '>'.
851 Tok.setKind(tok::greater);
853 Tok.setLocation(RAngleLoc);
859 /// \brief Parses a template-id that after the template name has
860 /// already been parsed.
862 /// This routine takes care of parsing the enclosed template argument
863 /// list ('<' template-parameter-list [opt] '>') and placing the
864 /// results into a form that can be transferred to semantic analysis.
866 /// \param Template the template declaration produced by isTemplateName
868 /// \param TemplateNameLoc the source location of the template name
870 /// \param SS if non-NULL, the nested-name-specifier preceding the
873 /// \param ConsumeLastToken if true, then we will consume the last
874 /// token that forms the template-id. Otherwise, we will leave the
875 /// last token in the stream (e.g., so that it can be replaced with an
876 /// annotation token).
878 Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
879 SourceLocation TemplateNameLoc,
880 const CXXScopeSpec &SS,
881 bool ConsumeLastToken,
882 SourceLocation &LAngleLoc,
883 TemplateArgList &TemplateArgs,
884 SourceLocation &RAngleLoc) {
885 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
888 LAngleLoc = ConsumeToken();
890 // Parse the optional template-argument-list.
891 bool Invalid = false;
893 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
894 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
895 Invalid = ParseTemplateArgumentList(TemplateArgs);
898 // Try to find the closing '>'.
899 if (ConsumeLastToken)
900 SkipUntil(tok::greater, StopAtSemi);
902 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
907 return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken,
908 /*ObjCGenericList=*/false);
911 /// \brief Replace the tokens that form a simple-template-id with an
912 /// annotation token containing the complete template-id.
914 /// The first token in the stream must be the name of a template that
915 /// is followed by a '<'. This routine will parse the complete
916 /// simple-template-id and replace the tokens with a single annotation
917 /// token with one of two different kinds: if the template-id names a
918 /// type (and \p AllowTypeAnnotation is true), the annotation token is
919 /// a type annotation that includes the optional nested-name-specifier
920 /// (\p SS). Otherwise, the annotation token is a template-id
921 /// annotation that does not include the optional
922 /// nested-name-specifier.
924 /// \param Template the declaration of the template named by the first
925 /// token (an identifier), as returned from \c Action::isTemplateName().
927 /// \param TNK the kind of template that \p Template
928 /// refers to, as returned from \c Action::isTemplateName().
930 /// \param SS if non-NULL, the nested-name-specifier that precedes
931 /// this template name.
933 /// \param TemplateKWLoc if valid, specifies that this template-id
934 /// annotation was preceded by the 'template' keyword and gives the
935 /// location of that keyword. If invalid (the default), then this
936 /// template-id was not preceded by a 'template' keyword.
938 /// \param AllowTypeAnnotation if true (the default), then a
939 /// simple-template-id that refers to a class template, template
940 /// template parameter, or other template that produces a type will be
941 /// replaced with a type annotation token. Otherwise, the
942 /// simple-template-id is always replaced with a template-id
943 /// annotation token.
945 /// If an unrecoverable parse error occurs and no annotation token can be
946 /// formed, this function returns true.
948 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
950 SourceLocation TemplateKWLoc,
951 UnqualifiedId &TemplateName,
952 bool AllowTypeAnnotation) {
953 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
954 assert(Template && Tok.is(tok::less) &&
955 "Parser isn't at the beginning of a template-id");
957 // Consume the template-name.
958 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
960 // Parse the enclosed template argument list.
961 SourceLocation LAngleLoc, RAngleLoc;
962 TemplateArgList TemplateArgs;
963 bool Invalid = ParseTemplateIdAfterTemplateName(Template,
965 SS, false, LAngleLoc,
970 // If we failed to parse the template ID but skipped ahead to a >, we're not
971 // going to be able to form a token annotation. Eat the '>' if present.
972 TryConsumeToken(tok::greater);
976 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
978 // Build the annotation token.
979 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
981 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
982 Template, TemplateNameLoc,
983 LAngleLoc, TemplateArgsPtr, RAngleLoc);
984 if (Type.isInvalid()) {
985 // If we failed to parse the template ID but skipped ahead to a >, we're not
986 // going to be able to form a token annotation. Eat the '>' if present.
987 TryConsumeToken(tok::greater);
991 Tok.setKind(tok::annot_typename);
992 setTypeAnnotation(Tok, Type.get());
994 Tok.setLocation(SS.getBeginLoc());
995 else if (TemplateKWLoc.isValid())
996 Tok.setLocation(TemplateKWLoc);
998 Tok.setLocation(TemplateNameLoc);
1000 // Build a template-id annotation token that can be processed
1002 Tok.setKind(tok::annot_template_id);
1003 TemplateIdAnnotation *TemplateId
1004 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds);
1005 TemplateId->TemplateNameLoc = TemplateNameLoc;
1006 if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
1007 TemplateId->Name = TemplateName.Identifier;
1008 TemplateId->Operator = OO_None;
1010 TemplateId->Name = nullptr;
1011 TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
1013 TemplateId->SS = SS;
1014 TemplateId->TemplateKWLoc = TemplateKWLoc;
1015 TemplateId->Template = Template;
1016 TemplateId->Kind = TNK;
1017 TemplateId->LAngleLoc = LAngleLoc;
1018 TemplateId->RAngleLoc = RAngleLoc;
1019 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
1020 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
1021 Args[Arg] = ParsedTemplateArgument(TemplateArgs[Arg]);
1022 Tok.setAnnotationValue(TemplateId);
1023 if (TemplateKWLoc.isValid())
1024 Tok.setLocation(TemplateKWLoc);
1026 Tok.setLocation(TemplateNameLoc);
1029 // Common fields for the annotation token
1030 Tok.setAnnotationEndLoc(RAngleLoc);
1032 // In case the tokens were cached, have Preprocessor replace them with the
1033 // annotation token.
1034 PP.AnnotateCachedTokens(Tok);
1038 /// \brief Replaces a template-id annotation token with a type
1039 /// annotation token.
1041 /// If there was a failure when forming the type from the template-id,
1042 /// a type annotation token will still be created, but will have a
1043 /// NULL type pointer to signify an error.
1044 void Parser::AnnotateTemplateIdTokenAsType() {
1045 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1047 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1048 assert((TemplateId->Kind == TNK_Type_template ||
1049 TemplateId->Kind == TNK_Dependent_template_name) &&
1050 "Only works for type and dependent templates");
1052 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1053 TemplateId->NumArgs);
1056 = Actions.ActOnTemplateIdType(TemplateId->SS,
1057 TemplateId->TemplateKWLoc,
1058 TemplateId->Template,
1059 TemplateId->TemplateNameLoc,
1060 TemplateId->LAngleLoc,
1062 TemplateId->RAngleLoc);
1063 // Create the new "type" annotation token.
1064 Tok.setKind(tok::annot_typename);
1065 setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
1066 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
1067 Tok.setLocation(TemplateId->SS.getBeginLoc());
1068 // End location stays the same
1070 // Replace the template-id annotation token, and possible the scope-specifier
1071 // that precedes it, with the typename annotation token.
1072 PP.AnnotateCachedTokens(Tok);
1075 /// \brief Determine whether the given token can end a template argument.
1076 static bool isEndOfTemplateArgument(Token Tok) {
1077 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater);
1080 /// \brief Parse a C++ template template argument.
1081 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1082 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1083 !Tok.is(tok::annot_cxxscope))
1084 return ParsedTemplateArgument();
1086 // C++0x [temp.arg.template]p1:
1087 // A template-argument for a template template-parameter shall be the name
1088 // of a class template or an alias template, expressed as id-expression.
1090 // We parse an id-expression that refers to a class template or alias
1091 // template. The grammar we parse is:
1093 // nested-name-specifier[opt] template[opt] identifier ...[opt]
1095 // followed by a token that terminates a template argument, such as ',',
1096 // '>', or (in some cases) '>>'.
1097 CXXScopeSpec SS; // nested-name-specifier, if present
1098 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1099 /*EnteringContext=*/false);
1101 ParsedTemplateArgument Result;
1102 SourceLocation EllipsisLoc;
1103 if (SS.isSet() && Tok.is(tok::kw_template)) {
1104 // Parse the optional 'template' keyword following the
1105 // nested-name-specifier.
1106 SourceLocation TemplateKWLoc = ConsumeToken();
1108 if (Tok.is(tok::identifier)) {
1109 // We appear to have a dependent template name.
1111 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1112 ConsumeToken(); // the identifier
1114 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1116 // If the next token signals the end of a template argument,
1117 // then we have a dependent template name that could be a template
1118 // template argument.
1119 TemplateTy Template;
1120 if (isEndOfTemplateArgument(Tok) &&
1121 Actions.ActOnDependentTemplateName(getCurScope(),
1122 SS, TemplateKWLoc, Name,
1123 /*ObjectType=*/ ParsedType(),
1124 /*EnteringContext=*/false,
1126 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1128 } else if (Tok.is(tok::identifier)) {
1129 // We may have a (non-dependent) template name.
1130 TemplateTy Template;
1132 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1133 ConsumeToken(); // the identifier
1135 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1137 if (isEndOfTemplateArgument(Tok)) {
1138 bool MemberOfUnknownSpecialization;
1139 TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
1140 /*hasTemplateKeyword=*/false,
1142 /*ObjectType=*/ ParsedType(),
1143 /*EnteringContext=*/false,
1145 MemberOfUnknownSpecialization);
1146 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1147 // We have an id-expression that refers to a class template or
1148 // (C++0x) alias template.
1149 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1154 // If this is a pack expansion, build it as such.
1155 if (EllipsisLoc.isValid() && !Result.isInvalid())
1156 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1161 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1163 /// template-argument: [C++ 14.2]
1164 /// constant-expression
1167 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1168 // C++ [temp.arg]p2:
1169 // In a template-argument, an ambiguity between a type-id and an
1170 // expression is resolved to a type-id, regardless of the form of
1171 // the corresponding template-parameter.
1173 // Therefore, we initially try to parse a type-id.
1174 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1175 SourceLocation Loc = Tok.getLocation();
1176 TypeResult TypeArg = ParseTypeName(/*Range=*/nullptr,
1177 Declarator::TemplateTypeArgContext);
1178 if (TypeArg.isInvalid())
1179 return ParsedTemplateArgument();
1181 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1182 TypeArg.get().getAsOpaquePtr(),
1186 // Try to parse a template template argument.
1188 TentativeParsingAction TPA(*this);
1190 ParsedTemplateArgument TemplateTemplateArgument
1191 = ParseTemplateTemplateArgument();
1192 if (!TemplateTemplateArgument.isInvalid()) {
1194 return TemplateTemplateArgument;
1197 // Revert this tentative parse to parse a non-type template argument.
1201 // Parse a non-type template argument.
1202 SourceLocation Loc = Tok.getLocation();
1203 ExprResult ExprArg = ParseConstantExpression(MaybeTypeCast);
1204 if (ExprArg.isInvalid() || !ExprArg.get())
1205 return ParsedTemplateArgument();
1207 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1208 ExprArg.get(), Loc);
1211 /// \brief Determine whether the current tokens can only be parsed as a
1212 /// template argument list (starting with the '<') and never as a '<'
1214 bool Parser::IsTemplateArgumentList(unsigned Skip) {
1215 struct AlwaysRevertAction : TentativeParsingAction {
1216 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1217 ~AlwaysRevertAction() { Revert(); }
1226 if (!TryConsumeToken(tok::less))
1229 // An empty template argument list.
1230 if (Tok.is(tok::greater))
1233 // See whether we have declaration specifiers, which indicate a type.
1234 while (isCXXDeclarationSpecifier() == TPResult::True)
1237 // If we have a '>' or a ',' then this is a template argument list.
1238 return Tok.isOneOf(tok::greater, tok::comma);
1241 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1242 /// (C++ [temp.names]). Returns true if there was an error.
1244 /// template-argument-list: [C++ 14.2]
1245 /// template-argument
1246 /// template-argument-list ',' template-argument
1248 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1249 // Template argument lists are constant-evaluation contexts.
1250 EnterExpressionEvaluationContext EvalContext(Actions,Sema::ConstantEvaluated);
1251 ColonProtectionRAIIObject ColonProtection(*this, false);
1254 ParsedTemplateArgument Arg = ParseTemplateArgument();
1255 SourceLocation EllipsisLoc;
1256 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1257 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1259 if (Arg.isInvalid()) {
1260 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1264 // Save this template argument.
1265 TemplateArgs.push_back(Arg);
1267 // If the next token is a comma, consume it and keep reading
1269 } while (TryConsumeToken(tok::comma));
1274 /// \brief Parse a C++ explicit template instantiation
1275 /// (C++ [temp.explicit]).
1277 /// explicit-instantiation:
1278 /// 'extern' [opt] 'template' declaration
1280 /// Note that the 'extern' is a GNU extension and C++11 feature.
1281 Decl *Parser::ParseExplicitInstantiation(unsigned Context,
1282 SourceLocation ExternLoc,
1283 SourceLocation TemplateLoc,
1284 SourceLocation &DeclEnd,
1285 AccessSpecifier AS) {
1286 // This isn't really required here.
1287 ParsingDeclRAIIObject
1288 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1290 return ParseSingleDeclarationAfterTemplate(Context,
1291 ParsedTemplateInfo(ExternLoc,
1293 ParsingTemplateParams,
1297 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1299 return getTemplateParamsRange(TemplateParams->data(),
1300 TemplateParams->size());
1302 SourceRange R(TemplateLoc);
1303 if (ExternLoc.isValid())
1304 R.setBegin(ExternLoc);
1308 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1309 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1312 /// \brief Late parse a C++ function template in Microsoft mode.
1313 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1317 // Get the FunctionDecl.
1318 FunctionDecl *FunD = LPT.D->getAsFunction();
1319 // Track template parameter depth.
1320 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1322 // To restore the context after late parsing.
1323 Sema::ContextRAII GlobalSavedContext(
1324 Actions, Actions.Context.getTranslationUnitDecl());
1326 SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1328 // Get the list of DeclContexts to reenter.
1329 SmallVector<DeclContext*, 4> DeclContextsToReenter;
1330 DeclContext *DD = FunD;
1331 while (DD && !DD->isTranslationUnit()) {
1332 DeclContextsToReenter.push_back(DD);
1333 DD = DD->getLexicalParent();
1336 // Reenter template scopes from outermost to innermost.
1337 SmallVectorImpl<DeclContext *>::reverse_iterator II =
1338 DeclContextsToReenter.rbegin();
1339 for (; II != DeclContextsToReenter.rend(); ++II) {
1340 TemplateParamScopeStack.push_back(new ParseScope(this,
1341 Scope::TemplateParamScope));
1342 unsigned NumParamLists =
1343 Actions.ActOnReenterTemplateScope(getCurScope(), cast<Decl>(*II));
1344 CurTemplateDepthTracker.addDepth(NumParamLists);
1346 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1347 Actions.PushDeclContext(Actions.getCurScope(), *II);
1351 assert(!LPT.Toks.empty() && "Empty body!");
1353 // Append the current token at the end of the new token stream so that it
1354 // doesn't get lost.
1355 LPT.Toks.push_back(Tok);
1356 PP.EnterTokenStream(LPT.Toks.data(), LPT.Toks.size(), true, false);
1358 // Consume the previously pushed token.
1359 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1360 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1361 "Inline method not starting with '{', ':' or 'try'");
1363 // Parse the method body. Function body parsing code is similar enough
1364 // to be re-used for method bodies as well.
1365 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1367 // Recreate the containing function DeclContext.
1368 Sema::ContextRAII FunctionSavedContext(Actions,
1369 Actions.getContainingDC(FunD));
1371 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1373 if (Tok.is(tok::kw_try)) {
1374 ParseFunctionTryBlock(LPT.D, FnScope);
1376 if (Tok.is(tok::colon))
1377 ParseConstructorInitializer(LPT.D);
1379 Actions.ActOnDefaultCtorInitializers(LPT.D);
1381 if (Tok.is(tok::l_brace)) {
1382 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
1383 cast<FunctionTemplateDecl>(LPT.D)
1384 ->getTemplateParameters()
1385 ->getDepth() == TemplateParameterDepth - 1) &&
1386 "TemplateParameterDepth should be greater than the depth of "
1387 "current template being instantiated!");
1388 ParseFunctionStatementBody(LPT.D, FnScope);
1389 Actions.UnmarkAsLateParsedTemplate(FunD);
1391 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1396 SmallVectorImpl<ParseScope *>::reverse_iterator I =
1397 TemplateParamScopeStack.rbegin();
1398 for (; I != TemplateParamScopeStack.rend(); ++I)
1402 /// \brief Lex a delayed template function for late parsing.
1403 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1404 tok::TokenKind kind = Tok.getKind();
1405 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1406 // Consume everything up to (and including) the matching right brace.
1407 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1410 // If we're in a function-try-block, we need to store all the catch blocks.
1411 if (kind == tok::kw_try) {
1412 while (Tok.is(tok::kw_catch)) {
1413 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1414 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);