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<Decl*, 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 // FIXME: We should return the DeclGroup to the caller.
201 ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
206 // Parse the declaration specifiers, stealing any diagnostics from
207 // the template parameters.
208 ParsingDeclSpec DS(*this, &DiagsFromTParams);
210 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
211 getDeclSpecContextFromDeclaratorContext(Context));
213 if (Tok.is(tok::semi)) {
214 ProhibitAttributes(prefixAttrs);
215 DeclEnd = ConsumeToken();
216 RecordDecl *AnonRecord = nullptr;
217 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
218 getCurScope(), AS, DS,
219 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
220 : MultiTemplateParamsArg(),
221 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
223 assert(!AnonRecord &&
224 "Anonymous unions/structs should not be valid with template");
229 // Move the attributes from the prefix into the DS.
230 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
231 ProhibitAttributes(prefixAttrs);
233 DS.takeAttributesFrom(prefixAttrs);
235 // Parse the declarator.
236 ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
237 ParseDeclarator(DeclaratorInfo);
238 // Error parsing the declarator?
239 if (!DeclaratorInfo.hasName()) {
240 // If so, skip until the semi-colon or a }.
241 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
242 if (Tok.is(tok::semi))
247 LateParsedAttrList LateParsedAttrs(true);
248 if (DeclaratorInfo.isFunctionDeclarator())
249 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
251 if (DeclaratorInfo.isFunctionDeclarator() &&
252 isStartOfFunctionDefinition(DeclaratorInfo)) {
254 // Function definitions are only allowed at file scope and in C++ classes.
255 // The C++ inline method definition case is handled elsewhere, so we only
256 // need to handle the file scope definition case.
257 if (Context != Declarator::FileContext) {
258 Diag(Tok, diag::err_function_definition_not_allowed);
263 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
264 // Recover by ignoring the 'typedef'. This was probably supposed to be
265 // the 'typename' keyword, which we should have already suggested adding
266 // if it's appropriate.
267 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
268 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
269 DS.ClearStorageClassSpecs();
272 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
273 if (DeclaratorInfo.getName().getKind() != UnqualifiedId::IK_TemplateId) {
274 // If the declarator-id is not a template-id, issue a diagnostic and
275 // recover by ignoring the 'template' keyword.
276 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
277 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
280 SourceLocation LAngleLoc
281 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
282 Diag(DeclaratorInfo.getIdentifierLoc(),
283 diag::err_explicit_instantiation_with_definition)
284 << SourceRange(TemplateInfo.TemplateLoc)
285 << FixItHint::CreateInsertion(LAngleLoc, "<>");
287 // Recover as if it were an explicit specialization.
288 TemplateParameterLists FakedParamLists;
289 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
290 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
291 LAngleLoc, nullptr));
293 return ParseFunctionDefinition(
294 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
295 /*isSpecialization=*/true,
296 /*LastParamListWasEmpty=*/true),
300 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
304 // Parse this declaration.
305 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
308 if (Tok.is(tok::comma)) {
309 Diag(Tok, diag::err_multiple_template_declarators)
310 << (int)TemplateInfo.Kind;
311 SkipUntil(tok::semi);
315 // Eat the semi colon after the declaration.
316 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
317 if (LateParsedAttrs.size() > 0)
318 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
319 DeclaratorInfo.complete(ThisDecl);
323 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
324 /// angle brackets. Depth is the depth of this template-parameter-list, which
325 /// is the number of template headers directly enclosing this template header.
326 /// TemplateParams is the current list of template parameters we're building.
327 /// The template parameter we parse will be added to this list. LAngleLoc and
328 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
329 /// that enclose this template parameter list.
331 /// \returns true if an error occurred, false otherwise.
332 bool Parser::ParseTemplateParameters(unsigned Depth,
333 SmallVectorImpl<Decl*> &TemplateParams,
334 SourceLocation &LAngleLoc,
335 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<Decl*> &TemplateParams) {
376 = ParseTemplateParameter(Depth, TemplateParams.size())) {
377 TemplateParams.push_back(TmpParam);
379 // If we failed to parse a template parameter, skip until we find
380 // a comma or closing brace.
381 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
382 StopAtSemi | StopBeforeMatch);
385 // Did we find a comma or the end of the template parameter list?
386 if (Tok.is(tok::comma)) {
388 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
389 // Don't consume this... that's done by template parser.
392 // Somebody probably forgot to close the template. Skip ahead and
393 // try to get out of the expression. This error is currently
394 // subsumed by whatever goes on in ParseTemplateParameter.
395 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
396 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
397 StopAtSemi | StopBeforeMatch);
404 /// \brief Determine whether the parser is at the start of a template
406 bool Parser::isStartOfTemplateTypeParameter() {
407 if (Tok.is(tok::kw_class)) {
408 // "class" may be the start of an elaborated-type-specifier or a
409 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
410 switch (NextToken().getKind()) {
414 case tok::greatergreater:
418 case tok::identifier:
419 // This may be either a type-parameter or an elaborated-type-specifier.
420 // We have to look further.
427 switch (GetLookAheadToken(2).getKind()) {
431 case tok::greatergreater:
439 if (Tok.isNot(tok::kw_typename))
442 // C++ [temp.param]p2:
443 // There is no semantic difference between class and typename in a
444 // template-parameter. typename followed by an unqualified-id
445 // names a template type parameter. typename followed by a
446 // qualified-id denotes the type in a non-type
447 // parameter-declaration.
448 Token Next = NextToken();
450 // If we have an identifier, skip over it.
451 if (Next.getKind() == tok::identifier)
452 Next = GetLookAheadToken(2);
454 switch (Next.getKind()) {
458 case tok::greatergreater:
467 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
469 /// template-parameter: [C++ temp.param]
471 /// parameter-declaration
473 /// type-parameter: (see below)
474 /// 'class' ...[opt] identifier[opt]
475 /// 'class' identifier[opt] '=' type-id
476 /// 'typename' ...[opt] identifier[opt]
477 /// 'typename' identifier[opt] '=' type-id
478 /// 'template' '<' template-parameter-list '>'
479 /// 'class' ...[opt] identifier[opt]
480 /// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
482 Decl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
483 if (isStartOfTemplateTypeParameter())
484 return ParseTypeParameter(Depth, Position);
486 if (Tok.is(tok::kw_template))
487 return ParseTemplateTemplateParameter(Depth, Position);
489 // If it's none of the above, then it must be a parameter declaration.
490 // NOTE: This will pick up errors in the closure of the template parameter
491 // list (e.g., template < ; Check here to implement >> style closures.
492 return ParseNonTypeTemplateParameter(Depth, Position);
495 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
496 /// Other kinds of template parameters are parsed in
497 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
499 /// type-parameter: [C++ temp.param]
500 /// 'class' ...[opt][C++0x] identifier[opt]
501 /// 'class' identifier[opt] '=' type-id
502 /// 'typename' ...[opt][C++0x] identifier[opt]
503 /// 'typename' identifier[opt] '=' type-id
504 Decl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
505 assert(Tok.isOneOf(tok::kw_class, tok::kw_typename) &&
506 "A type-parameter starts with 'class' or 'typename'");
508 // Consume the 'class' or 'typename' keyword.
509 bool TypenameKeyword = Tok.is(tok::kw_typename);
510 SourceLocation KeyLoc = ConsumeToken();
512 // Grab the ellipsis (if given).
513 SourceLocation EllipsisLoc;
514 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
516 getLangOpts().CPlusPlus11
517 ? diag::warn_cxx98_compat_variadic_templates
518 : diag::ext_variadic_templates);
521 // Grab the template parameter name (if given)
522 SourceLocation NameLoc;
523 IdentifierInfo *ParamName = nullptr;
524 if (Tok.is(tok::identifier)) {
525 ParamName = Tok.getIdentifierInfo();
526 NameLoc = ConsumeToken();
527 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
528 tok::greatergreater)) {
529 // Unnamed template parameter. Don't have to do anything here, just
530 // don't consume this token.
532 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
536 // Recover from misplaced ellipsis.
537 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
538 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
539 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
541 // Grab a default argument (if available).
542 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
543 // we introduce the type parameter into the local scope.
544 SourceLocation EqualLoc;
545 ParsedType DefaultArg;
546 if (TryConsumeToken(tok::equal, EqualLoc))
547 DefaultArg = ParseTypeName(/*Range=*/nullptr,
548 Declarator::TemplateTypeArgContext).get();
550 return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
551 KeyLoc, ParamName, NameLoc, Depth, Position,
552 EqualLoc, DefaultArg);
555 /// ParseTemplateTemplateParameter - Handle the parsing of template
556 /// template parameters.
558 /// type-parameter: [C++ temp.param]
559 /// 'template' '<' template-parameter-list '>' type-parameter-key
560 /// ...[opt] identifier[opt]
561 /// 'template' '<' template-parameter-list '>' type-parameter-key
562 /// identifier[opt] = id-expression
563 /// type-parameter-key:
565 /// 'typename' [C++1z]
567 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
568 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
570 // Handle the template <...> part.
571 SourceLocation TemplateLoc = ConsumeToken();
572 SmallVector<Decl*,8> TemplateParams;
573 SourceLocation LAngleLoc, RAngleLoc;
575 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
576 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
582 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
583 // Generate a meaningful error if the user forgot to put class before the
584 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
585 // or greater appear immediately or after 'struct'. In the latter case,
586 // replace the keyword with 'class'.
587 if (!TryConsumeToken(tok::kw_class)) {
588 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
589 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
590 if (Tok.is(tok::kw_typename)) {
591 Diag(Tok.getLocation(),
592 getLangOpts().CPlusPlus1z
593 ? diag::warn_cxx14_compat_template_template_param_typename
594 : diag::ext_template_template_param_typename)
595 << (!getLangOpts().CPlusPlus1z
596 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
598 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
599 tok::greatergreater, tok::ellipsis)) {
600 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
601 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
602 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
604 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
610 // Parse the ellipsis, if given.
611 SourceLocation EllipsisLoc;
612 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
614 getLangOpts().CPlusPlus11
615 ? diag::warn_cxx98_compat_variadic_templates
616 : diag::ext_variadic_templates);
618 // Get the identifier, if given.
619 SourceLocation NameLoc;
620 IdentifierInfo *ParamName = nullptr;
621 if (Tok.is(tok::identifier)) {
622 ParamName = Tok.getIdentifierInfo();
623 NameLoc = ConsumeToken();
624 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
625 tok::greatergreater)) {
626 // Unnamed template parameter. Don't have to do anything here, just
627 // don't consume this token.
629 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
633 // Recover from misplaced ellipsis.
634 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
635 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
636 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
638 TemplateParameterList *ParamList =
639 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
640 TemplateLoc, LAngleLoc,
644 // Grab a default argument (if available).
645 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
646 // we introduce the template parameter into the local scope.
647 SourceLocation EqualLoc;
648 ParsedTemplateArgument DefaultArg;
649 if (TryConsumeToken(tok::equal, EqualLoc)) {
650 DefaultArg = ParseTemplateTemplateArgument();
651 if (DefaultArg.isInvalid()) {
652 Diag(Tok.getLocation(),
653 diag::err_default_template_template_parameter_not_template);
654 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
655 StopAtSemi | StopBeforeMatch);
659 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
660 ParamList, EllipsisLoc,
661 ParamName, NameLoc, Depth,
662 Position, EqualLoc, DefaultArg);
665 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
666 /// template parameters (e.g., in "template<int Size> class array;").
668 /// template-parameter:
670 /// parameter-declaration
672 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
673 // Parse the declaration-specifiers (i.e., the type).
674 // FIXME: The type should probably be restricted in some way... Not all
675 // declarators (parts of declarators?) are accepted for parameters.
676 DeclSpec DS(AttrFactory);
677 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
680 // Parse this as a typename.
681 Declarator ParamDecl(DS, Declarator::TemplateParamContext);
682 ParseDeclarator(ParamDecl);
683 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
684 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
688 // Recover from misplaced ellipsis.
689 SourceLocation EllipsisLoc;
690 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
691 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
693 // If there is a default value, parse it.
694 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
695 // we introduce the template parameter into the local scope.
696 SourceLocation EqualLoc;
697 ExprResult DefaultArg;
698 if (TryConsumeToken(tok::equal, EqualLoc)) {
699 // C++ [temp.param]p15:
700 // When parsing a default template-argument for a non-type
701 // template-parameter, the first non-nested > is taken as the
702 // end of the template-parameter-list rather than a greater-than
704 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
705 EnterExpressionEvaluationContext ConstantEvaluated(
706 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
708 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
709 if (DefaultArg.isInvalid())
710 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
713 // Create the parameter.
714 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
715 Depth, Position, EqualLoc,
719 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
720 SourceLocation CorrectLoc,
721 bool AlreadyHasEllipsis,
722 bool IdentifierHasName) {
724 if (!AlreadyHasEllipsis)
725 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
726 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
727 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
728 << !IdentifierHasName;
731 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
733 assert(EllipsisLoc.isValid());
734 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
735 if (!AlreadyHasEllipsis)
736 D.setEllipsisLoc(EllipsisLoc);
737 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
738 AlreadyHasEllipsis, D.hasName());
741 /// \brief Parses a '>' at the end of a template list.
743 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
744 /// to determine if these tokens were supposed to be a '>' followed by
745 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
747 /// \param RAngleLoc the location of the consumed '>'.
749 /// \param ConsumeLastToken if true, the '>' is consumed.
751 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
752 /// type parameter or type argument list, rather than a C++ template parameter
753 /// or argument list.
755 /// \returns true, if current token does not start with '>', false otherwise.
756 bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
757 bool ConsumeLastToken,
758 bool ObjCGenericList) {
759 // What will be left once we've consumed the '>'.
760 tok::TokenKind RemainingToken;
761 const char *ReplacementStr = "> >";
763 switch (Tok.getKind()) {
765 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
769 // Determine the location of the '>' token. Only consume this token
770 // if the caller asked us to.
771 RAngleLoc = Tok.getLocation();
772 if (ConsumeLastToken)
776 case tok::greatergreater:
777 RemainingToken = tok::greater;
780 case tok::greatergreatergreater:
781 RemainingToken = tok::greatergreater;
784 case tok::greaterequal:
785 RemainingToken = tok::equal;
786 ReplacementStr = "> =";
789 case tok::greatergreaterequal:
790 RemainingToken = tok::greaterequal;
794 // This template-id is terminated by a token which starts with a '>'. Outside
795 // C++11, this is now error recovery, and in C++11, this is error recovery if
796 // the token isn't '>>' or '>>>'.
797 // '>>>' is for CUDA, where this sequence of characters is parsed into
798 // tok::greatergreatergreater, rather than two separate tokens.
800 // We always allow this for Objective-C type parameter and type argument
802 RAngleLoc = Tok.getLocation();
803 Token Next = NextToken();
804 if (!ObjCGenericList) {
805 // The source range of the '>>' or '>=' at the start of the token.
806 CharSourceRange ReplacementRange =
807 CharSourceRange::getCharRange(RAngleLoc,
808 Lexer::AdvanceToTokenCharacter(RAngleLoc, 2, PP.getSourceManager(),
811 // A hint to put a space between the '>>'s. In order to make the hint as
812 // clear as possible, we include the characters either side of the space in
813 // the replacement, rather than just inserting a space at SecondCharLoc.
814 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
817 // A hint to put another space after the token, if it would otherwise be
818 // lexed differently.
820 if ((RemainingToken == tok::greater ||
821 RemainingToken == tok::greatergreater) &&
822 (Next.isOneOf(tok::greater, tok::greatergreater,
823 tok::greatergreatergreater, tok::equal,
824 tok::greaterequal, tok::greatergreaterequal,
826 areTokensAdjacent(Tok, Next))
827 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
829 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
830 if (getLangOpts().CPlusPlus11 &&
831 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
832 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
833 else if (Tok.is(tok::greaterequal))
834 DiagId = diag::err_right_angle_bracket_equal_needs_space;
835 Diag(Tok.getLocation(), DiagId) << Hint1 << Hint2;
838 // Strip the initial '>' from the token.
840 if (RemainingToken == tok::equal && Next.is(tok::equal) &&
841 areTokensAdjacent(Tok, Next)) {
842 // Join two adjacent '=' tokens into one, for cases like:
843 // void (*p)() = f<int>;
846 Tok.setKind(tok::equalequal);
847 Tok.setLength(Tok.getLength() + 1);
849 Tok.setKind(RemainingToken);
850 Tok.setLength(Tok.getLength() - 1);
852 Tok.setLocation(Lexer::AdvanceToTokenCharacter(RAngleLoc, 1,
853 PP.getSourceManager(),
856 // The advance from '>>' to '>' in a ObjectiveC template argument list needs
857 // to be properly reflected in the token cache to allow correct interaction
858 // between annotation and backtracking.
859 if (ObjCGenericList && PrevTok.getKind() == tok::greatergreater &&
860 RemainingToken == tok::greater && PP.IsPreviousCachedToken(PrevTok)) {
861 PrevTok.setKind(RemainingToken);
862 PrevTok.setLength(1);
863 // Break tok::greatergreater into two tok::greater but only add the second
864 // one in case the client asks to consume the last token.
865 if (ConsumeLastToken)
866 PP.ReplacePreviousCachedToken({PrevTok, Tok});
868 PP.ReplacePreviousCachedToken({PrevTok});
871 if (!ConsumeLastToken) {
872 // Since we're not supposed to consume the '>' token, we need to push
873 // this token and revert the current token back to the '>'.
875 Tok.setKind(tok::greater);
877 Tok.setLocation(RAngleLoc);
883 /// \brief Parses a template-id that after the template name has
884 /// already been parsed.
886 /// This routine takes care of parsing the enclosed template argument
887 /// list ('<' template-parameter-list [opt] '>') and placing the
888 /// results into a form that can be transferred to semantic analysis.
890 /// \param ConsumeLastToken if true, then we will consume the last
891 /// token that forms the template-id. Otherwise, we will leave the
892 /// last token in the stream (e.g., so that it can be replaced with an
893 /// annotation token).
895 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
896 SourceLocation &LAngleLoc,
897 TemplateArgList &TemplateArgs,
898 SourceLocation &RAngleLoc) {
899 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
902 LAngleLoc = ConsumeToken();
904 // Parse the optional template-argument-list.
905 bool Invalid = false;
907 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
908 if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater))
909 Invalid = ParseTemplateArgumentList(TemplateArgs);
912 // Try to find the closing '>'.
913 if (ConsumeLastToken)
914 SkipUntil(tok::greater, StopAtSemi);
916 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
921 return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken,
922 /*ObjCGenericList=*/false);
925 /// \brief Replace the tokens that form a simple-template-id with an
926 /// annotation token containing the complete template-id.
928 /// The first token in the stream must be the name of a template that
929 /// is followed by a '<'. This routine will parse the complete
930 /// simple-template-id and replace the tokens with a single annotation
931 /// token with one of two different kinds: if the template-id names a
932 /// type (and \p AllowTypeAnnotation is true), the annotation token is
933 /// a type annotation that includes the optional nested-name-specifier
934 /// (\p SS). Otherwise, the annotation token is a template-id
935 /// annotation that does not include the optional
936 /// nested-name-specifier.
938 /// \param Template the declaration of the template named by the first
939 /// token (an identifier), as returned from \c Action::isTemplateName().
941 /// \param TNK the kind of template that \p Template
942 /// refers to, as returned from \c Action::isTemplateName().
944 /// \param SS if non-NULL, the nested-name-specifier that precedes
945 /// this template name.
947 /// \param TemplateKWLoc if valid, specifies that this template-id
948 /// annotation was preceded by the 'template' keyword and gives the
949 /// location of that keyword. If invalid (the default), then this
950 /// template-id was not preceded by a 'template' keyword.
952 /// \param AllowTypeAnnotation if true (the default), then a
953 /// simple-template-id that refers to a class template, template
954 /// template parameter, or other template that produces a type will be
955 /// replaced with a type annotation token. Otherwise, the
956 /// simple-template-id is always replaced with a template-id
957 /// annotation token.
959 /// If an unrecoverable parse error occurs and no annotation token can be
960 /// formed, this function returns true.
962 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
964 SourceLocation TemplateKWLoc,
965 UnqualifiedId &TemplateName,
966 bool AllowTypeAnnotation) {
967 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
968 assert(Template && Tok.is(tok::less) &&
969 "Parser isn't at the beginning of a template-id");
971 // Consume the template-name.
972 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
974 // Parse the enclosed template argument list.
975 SourceLocation LAngleLoc, RAngleLoc;
976 TemplateArgList TemplateArgs;
977 bool Invalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
982 // If we failed to parse the template ID but skipped ahead to a >, we're not
983 // going to be able to form a token annotation. Eat the '>' if present.
984 TryConsumeToken(tok::greater);
988 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
990 // Build the annotation token.
991 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
992 TypeResult Type = Actions.ActOnTemplateIdType(
993 SS, TemplateKWLoc, Template, TemplateName.Identifier,
994 TemplateNameLoc, LAngleLoc, TemplateArgsPtr, RAngleLoc);
995 if (Type.isInvalid()) {
996 // If we failed to parse the template ID but skipped ahead to a >, we're
997 // not going to be able to form a token annotation. Eat the '>' if
999 TryConsumeToken(tok::greater);
1003 Tok.setKind(tok::annot_typename);
1004 setTypeAnnotation(Tok, Type.get());
1005 if (SS.isNotEmpty())
1006 Tok.setLocation(SS.getBeginLoc());
1007 else if (TemplateKWLoc.isValid())
1008 Tok.setLocation(TemplateKWLoc);
1010 Tok.setLocation(TemplateNameLoc);
1012 // Build a template-id annotation token that can be processed
1014 Tok.setKind(tok::annot_template_id);
1016 IdentifierInfo *TemplateII =
1017 TemplateName.getKind() == UnqualifiedId::IK_Identifier
1018 ? TemplateName.Identifier
1021 OverloadedOperatorKind OpKind =
1022 TemplateName.getKind() == UnqualifiedId::IK_Identifier
1024 : TemplateName.OperatorFunctionId.Operator;
1026 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
\r
1027 SS, TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
\r
1028 LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
1030 Tok.setAnnotationValue(TemplateId);
1031 if (TemplateKWLoc.isValid())
1032 Tok.setLocation(TemplateKWLoc);
1034 Tok.setLocation(TemplateNameLoc);
1037 // Common fields for the annotation token
1038 Tok.setAnnotationEndLoc(RAngleLoc);
1040 // In case the tokens were cached, have Preprocessor replace them with the
1041 // annotation token.
1042 PP.AnnotateCachedTokens(Tok);
1046 /// \brief Replaces a template-id annotation token with a type
1047 /// annotation token.
1049 /// If there was a failure when forming the type from the template-id,
1050 /// a type annotation token will still be created, but will have a
1051 /// NULL type pointer to signify an error.
1053 /// \param IsClassName Is this template-id appearing in a context where we
1054 /// know it names a class, such as in an elaborated-type-specifier or
1055 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
1056 /// in those contexts.)
1057 void Parser::AnnotateTemplateIdTokenAsType(bool IsClassName) {
1058 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1060 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1061 assert((TemplateId->Kind == TNK_Type_template ||
1062 TemplateId->Kind == TNK_Dependent_template_name) &&
1063 "Only works for type and dependent templates");
1065 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1066 TemplateId->NumArgs);
1069 = Actions.ActOnTemplateIdType(TemplateId->SS,
1070 TemplateId->TemplateKWLoc,
1071 TemplateId->Template,
1073 TemplateId->TemplateNameLoc,
1074 TemplateId->LAngleLoc,
1076 TemplateId->RAngleLoc,
1077 /*IsCtorOrDtorName*/false,
1079 // Create the new "type" annotation token.
1080 Tok.setKind(tok::annot_typename);
1081 setTypeAnnotation(Tok, Type.isInvalid() ? nullptr : Type.get());
1082 if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
1083 Tok.setLocation(TemplateId->SS.getBeginLoc());
1084 // End location stays the same
1086 // Replace the template-id annotation token, and possible the scope-specifier
1087 // that precedes it, with the typename annotation token.
1088 PP.AnnotateCachedTokens(Tok);
1091 /// \brief Determine whether the given token can end a template argument.
1092 static bool isEndOfTemplateArgument(Token Tok) {
1093 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater);
1096 /// \brief Parse a C++ template template argument.
1097 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1098 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1099 !Tok.is(tok::annot_cxxscope))
1100 return ParsedTemplateArgument();
1102 // C++0x [temp.arg.template]p1:
1103 // A template-argument for a template template-parameter shall be the name
1104 // of a class template or an alias template, expressed as id-expression.
1106 // We parse an id-expression that refers to a class template or alias
1107 // template. The grammar we parse is:
1109 // nested-name-specifier[opt] template[opt] identifier ...[opt]
1111 // followed by a token that terminates a template argument, such as ',',
1112 // '>', or (in some cases) '>>'.
1113 CXXScopeSpec SS; // nested-name-specifier, if present
1114 ParseOptionalCXXScopeSpecifier(SS, nullptr,
1115 /*EnteringContext=*/false);
1117 ParsedTemplateArgument Result;
1118 SourceLocation EllipsisLoc;
1119 if (SS.isSet() && Tok.is(tok::kw_template)) {
1120 // Parse the optional 'template' keyword following the
1121 // nested-name-specifier.
1122 SourceLocation TemplateKWLoc = ConsumeToken();
1124 if (Tok.is(tok::identifier)) {
1125 // We appear to have a dependent template name.
1127 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1128 ConsumeToken(); // the identifier
1130 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1132 // If the next token signals the end of a template argument,
1133 // then we have a dependent template name that could be a template
1134 // template argument.
1135 TemplateTy Template;
1136 if (isEndOfTemplateArgument(Tok) &&
1137 Actions.ActOnDependentTemplateName(
1138 getCurScope(), SS, TemplateKWLoc, Name,
1139 /*ObjectType=*/nullptr,
1140 /*EnteringContext=*/false, Template))
1141 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1143 } else if (Tok.is(tok::identifier)) {
1144 // We may have a (non-dependent) template name.
1145 TemplateTy Template;
1147 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1148 ConsumeToken(); // the identifier
1150 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1152 if (isEndOfTemplateArgument(Tok)) {
1153 bool MemberOfUnknownSpecialization;
1154 TemplateNameKind TNK = Actions.isTemplateName(
1156 /*hasTemplateKeyword=*/false, Name,
1157 /*ObjectType=*/nullptr,
1158 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1159 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1160 // We have an id-expression that refers to a class template or
1161 // (C++0x) alias template.
1162 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1167 // If this is a pack expansion, build it as such.
1168 if (EllipsisLoc.isValid() && !Result.isInvalid())
1169 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1174 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1176 /// template-argument: [C++ 14.2]
1177 /// constant-expression
1180 ParsedTemplateArgument Parser::ParseTemplateArgument() {
1181 // C++ [temp.arg]p2:
1182 // In a template-argument, an ambiguity between a type-id and an
1183 // expression is resolved to a type-id, regardless of the form of
1184 // the corresponding template-parameter.
1186 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1187 // up and annotate an identifier as an id-expression during disambiguation,
1188 // so enter the appropriate context for a constant expression template
1189 // argument before trying to disambiguate.
1191 EnterExpressionEvaluationContext EnterConstantEvaluated(
1192 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1193 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1194 SourceLocation Loc = Tok.getLocation();
1195 TypeResult TypeArg = ParseTypeName(/*Range=*/nullptr,
1196 Declarator::TemplateTypeArgContext);
1197 if (TypeArg.isInvalid())
1198 return ParsedTemplateArgument();
1200 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
1201 TypeArg.get().getAsOpaquePtr(),
1205 // Try to parse a template template argument.
1207 TentativeParsingAction TPA(*this);
1209 ParsedTemplateArgument TemplateTemplateArgument
1210 = ParseTemplateTemplateArgument();
1211 if (!TemplateTemplateArgument.isInvalid()) {
1213 return TemplateTemplateArgument;
1216 // Revert this tentative parse to parse a non-type template argument.
1220 // Parse a non-type template argument.
1221 SourceLocation Loc = Tok.getLocation();
1222 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
1223 if (ExprArg.isInvalid() || !ExprArg.get())
1224 return ParsedTemplateArgument();
1226 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1227 ExprArg.get(), Loc);
1230 /// \brief Determine whether the current tokens can only be parsed as a
1231 /// template argument list (starting with the '<') and never as a '<'
1233 bool Parser::IsTemplateArgumentList(unsigned Skip) {
1234 struct AlwaysRevertAction : TentativeParsingAction {
1235 AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1236 ~AlwaysRevertAction() { Revert(); }
1245 if (!TryConsumeToken(tok::less))
1248 // An empty template argument list.
1249 if (Tok.is(tok::greater))
1252 // See whether we have declaration specifiers, which indicate a type.
1253 while (isCXXDeclarationSpecifier() == TPResult::True)
1256 // If we have a '>' or a ',' then this is a template argument list.
1257 return Tok.isOneOf(tok::greater, tok::comma);
1260 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
1261 /// (C++ [temp.names]). Returns true if there was an error.
1263 /// template-argument-list: [C++ 14.2]
1264 /// template-argument
1265 /// template-argument-list ',' template-argument
1267 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1269 ColonProtectionRAIIObject ColonProtection(*this, false);
1272 ParsedTemplateArgument Arg = ParseTemplateArgument();
1273 SourceLocation EllipsisLoc;
1274 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1275 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1277 if (Arg.isInvalid()) {
1278 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1282 // Save this template argument.
1283 TemplateArgs.push_back(Arg);
1285 // If the next token is a comma, consume it and keep reading
1287 } while (TryConsumeToken(tok::comma));
1292 /// \brief Parse a C++ explicit template instantiation
1293 /// (C++ [temp.explicit]).
1295 /// explicit-instantiation:
1296 /// 'extern' [opt] 'template' declaration
1298 /// Note that the 'extern' is a GNU extension and C++11 feature.
1299 Decl *Parser::ParseExplicitInstantiation(unsigned Context,
1300 SourceLocation ExternLoc,
1301 SourceLocation TemplateLoc,
1302 SourceLocation &DeclEnd,
1303 AccessSpecifier AS) {
1304 // This isn't really required here.
1305 ParsingDeclRAIIObject
1306 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1308 return ParseSingleDeclarationAfterTemplate(Context,
1309 ParsedTemplateInfo(ExternLoc,
1311 ParsingTemplateParams,
1315 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1317 return getTemplateParamsRange(TemplateParams->data(),
1318 TemplateParams->size());
1320 SourceRange R(TemplateLoc);
1321 if (ExternLoc.isValid())
1322 R.setBegin(ExternLoc);
1326 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1327 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1330 /// \brief Late parse a C++ function template in Microsoft mode.
1331 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1335 // Get the FunctionDecl.
1336 FunctionDecl *FunD = LPT.D->getAsFunction();
1337 // Track template parameter depth.
1338 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1340 // To restore the context after late parsing.
1341 Sema::ContextRAII GlobalSavedContext(
1342 Actions, Actions.Context.getTranslationUnitDecl());
1344 SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1346 // Get the list of DeclContexts to reenter.
1347 SmallVector<DeclContext*, 4> DeclContextsToReenter;
1348 DeclContext *DD = FunD;
1349 while (DD && !DD->isTranslationUnit()) {
1350 DeclContextsToReenter.push_back(DD);
1351 DD = DD->getLexicalParent();
1354 // Reenter template scopes from outermost to innermost.
1355 SmallVectorImpl<DeclContext *>::reverse_iterator II =
1356 DeclContextsToReenter.rbegin();
1357 for (; II != DeclContextsToReenter.rend(); ++II) {
1358 TemplateParamScopeStack.push_back(new ParseScope(this,
1359 Scope::TemplateParamScope));
1360 unsigned NumParamLists =
1361 Actions.ActOnReenterTemplateScope(getCurScope(), cast<Decl>(*II));
1362 CurTemplateDepthTracker.addDepth(NumParamLists);
1364 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1365 Actions.PushDeclContext(Actions.getCurScope(), *II);
1369 assert(!LPT.Toks.empty() && "Empty body!");
1371 // Append the current token at the end of the new token stream so that it
1372 // doesn't get lost.
1373 LPT.Toks.push_back(Tok);
1374 PP.EnterTokenStream(LPT.Toks, true);
1376 // Consume the previously pushed token.
1377 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1378 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1379 "Inline method not starting with '{', ':' or 'try'");
1381 // Parse the method body. Function body parsing code is similar enough
1382 // to be re-used for method bodies as well.
1383 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
1385 // Recreate the containing function DeclContext.
1386 Sema::ContextRAII FunctionSavedContext(Actions,
1387 Actions.getContainingDC(FunD));
1389 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1391 if (Tok.is(tok::kw_try)) {
1392 ParseFunctionTryBlock(LPT.D, FnScope);
1394 if (Tok.is(tok::colon))
1395 ParseConstructorInitializer(LPT.D);
1397 Actions.ActOnDefaultCtorInitializers(LPT.D);
1399 if (Tok.is(tok::l_brace)) {
1400 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
1401 cast<FunctionTemplateDecl>(LPT.D)
1402 ->getTemplateParameters()
1403 ->getDepth() == TemplateParameterDepth - 1) &&
1404 "TemplateParameterDepth should be greater than the depth of "
1405 "current template being instantiated!");
1406 ParseFunctionStatementBody(LPT.D, FnScope);
1407 Actions.UnmarkAsLateParsedTemplate(FunD);
1409 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1414 SmallVectorImpl<ParseScope *>::reverse_iterator I =
1415 TemplateParamScopeStack.rbegin();
1416 for (; I != TemplateParamScopeStack.rend(); ++I)
1420 /// \brief Lex a delayed template function for late parsing.
1421 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1422 tok::TokenKind kind = Tok.getKind();
1423 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1424 // Consume everything up to (and including) the matching right brace.
1425 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1428 // If we're in a function-try-block, we need to store all the catch blocks.
1429 if (kind == tok::kw_try) {
1430 while (Tok.is(tok::kw_catch)) {
1431 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1432 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);