ParseTemplate.cpp source code [clang_source_code/lib/Parse/ParseTemplate.cpp]

1	//===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file implements parsing of C++ templates.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "clang/AST/ASTContext.h"
14	#include "clang/AST/DeclTemplate.h"
15	#include "clang/Parse/ParseDiagnostic.h"
16	#include "clang/Parse/Parser.h"
17	#include "clang/Parse/RAIIObjectsForParser.h"
18	#include "clang/Sema/DeclSpec.h"
19	#include "clang/Sema/ParsedTemplate.h"
20	#include "clang/Sema/Scope.h"
21	using namespace clang;
22
23	/// Parse a template declaration, explicit instantiation, or
24	/// explicit specialization.
25	Decl *Parser::ParseDeclarationStartingWithTemplate(
26	DeclaratorContext Context, SourceLocation &DeclEnd,
27	ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
28	ObjCDeclContextSwitch ObjCDC(*this);
29
30	if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
31	return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
32	DeclEnd, AccessAttrs, AS);
33	}
34	return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
35	AS);
36	}
37
38	/// Parse a template declaration or an explicit specialization.
39	///
40	/// Template declarations include one or more template parameter lists
41	/// and either the function or class template declaration. Explicit
42	/// specializations contain one or more 'template < >' prefixes
43	/// followed by a (possibly templated) declaration. Since the
44	/// syntactic form of both features is nearly identical, we parse all
45	/// of the template headers together and let semantic analysis sort
46	/// the declarations from the explicit specializations.
47	///
48	/// template-declaration: [C++ temp]
49	/// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
50	///
51	/// explicit-specialization: [ C++ temp.expl.spec]
52	/// 'template' '<' '>' declaration
53	Decl *Parser::ParseTemplateDeclarationOrSpecialization(
54	DeclaratorContext Context, SourceLocation &DeclEnd,
55	ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
56	(0) . __assert_fail ("Tok.isOneOf(tok..kw_export, tok..kw_template) && \"Token does not start a template declaration.\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 57, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
57	(0) . __assert_fail ("Tok.isOneOf(tok..kw_export, tok..kw_template) && \"Token does not start a template declaration.\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 57, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Token does not start a template declaration.");
58
59	// Enter template-parameter scope.
60	ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
61
62	// Tell the action that names should be checked in the context of
63	// the declaration to come.
64	ParsingDeclRAIIObject
65	ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
66
67	// Parse multiple levels of template headers within this template
68	// parameter scope, e.g.,
69	//
70	// template<typename T>
71	// template<typename U>
72	// class A<T>::B { ... };
73	//
74	// We parse multiple levels non-recursively so that we can build a
75	// single data structure containing all of the template parameter
76	// lists to easily differentiate between the case above and:
77	//
78	// template<typename T>
79	// class A {
80	// template<typename U> class B;
81	// };
82	//
83	// In the first case, the action for declaring A<T>::B receives
84	// both template parameter lists. In the second case, the action for
85	// defining A<T>::B receives just the inner template parameter list
86	// (and retrieves the outer template parameter list from its
87	// context).
88	bool isSpecialization = true;
89	bool LastParamListWasEmpty = false;
90	TemplateParameterLists ParamLists;
91	TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
92
93	do {
94	// Consume the 'export', if any.
95	SourceLocation ExportLoc;
96	TryConsumeToken(tok::kw_export, ExportLoc);
97
98	// Consume the 'template', which should be here.
99	SourceLocation TemplateLoc;
100	if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
101	Diag(Tok.getLocation(), diag::err_expected_template);
102	return nullptr;
103	}
104
105	// Parse the '<' template-parameter-list '>'
106	SourceLocation LAngleLoc, RAngleLoc;
107	SmallVector<NamedDecl*, 4> TemplateParams;
108	if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
109	TemplateParams, LAngleLoc, RAngleLoc)) {
110	// Skip until the semi-colon or a '}'.
111	SkipUntil(tok::r_brace, StopAtSemi \| StopBeforeMatch);
112	TryConsumeToken(tok::semi);
113	return nullptr;
114	}
115
116	ExprResult OptionalRequiresClauseConstraintER;
117	if (!TemplateParams.empty()) {
118	isSpecialization = false;
119	++CurTemplateDepthTracker;
120
121	if (TryConsumeToken(tok::kw_requires)) {
122	OptionalRequiresClauseConstraintER =
123	Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
124	if (!OptionalRequiresClauseConstraintER.isUsable()) {
125	// Skip until the semi-colon or a '}'.
126	SkipUntil(tok::r_brace, StopAtSemi \| StopBeforeMatch);
127	TryConsumeToken(tok::semi);
128	return nullptr;
129	}
130	}
131	} else {
132	LastParamListWasEmpty = true;
133	}
134
135	ParamLists.push_back(Actions.ActOnTemplateParameterList(
136	CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
137	TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
138	} while (Tok.isOneOf(tok::kw_export, tok::kw_template));
139
140	unsigned NewFlags = getCurScope()->getFlags() & ~Scope::TemplateParamScope;
141	ParseScopeFlags TemplateScopeFlags(this, NewFlags, isSpecialization);
142
143	// Parse the actual template declaration.
144	return ParseSingleDeclarationAfterTemplate(
145	Context,
146	ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
147	ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
148	}
149
150	/// Parse a single declaration that declares a template,
151	/// template specialization, or explicit instantiation of a template.
152	///
153	/// \param DeclEnd will receive the source location of the last token
154	/// within this declaration.
155	///
156	/// \param AS the access specifier associated with this
157	/// declaration. Will be AS_none for namespace-scope declarations.
158	///
159	/// \returns the new declaration.
160	Decl *Parser::ParseSingleDeclarationAfterTemplate(
161	DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
162	ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
163	ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
164	(0) . __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo..NonTemplate && \"Template information required\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 165, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
165	(0) . __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo..NonTemplate && \"Template information required\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 165, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Template information required");
166
167	if (Tok.is(tok::kw_static_assert)) {
168	// A static_assert declaration may not be templated.
169	Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
170	<< TemplateInfo.getSourceRange();
171	// Parse the static_assert declaration to improve error recovery.
172	return ParseStaticAssertDeclaration(DeclEnd);
173	}
174
175	if (Context == DeclaratorContext::MemberContext) {
176	// We are parsing a member template.
177	ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
178	&DiagsFromTParams);
179	return nullptr;
180	}
181
182	ParsedAttributesWithRange prefixAttrs(AttrFactory);
183	MaybeParseCXX11Attributes(prefixAttrs);
184
185	if (Tok.is(tok::kw_using)) {
186	auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
187	prefixAttrs);
188	if (!usingDeclPtr \|\| !usingDeclPtr.get().isSingleDecl())
189	return nullptr;
190	return usingDeclPtr.get().getSingleDecl();
191	}
192
193	// Parse the declaration specifiers, stealing any diagnostics from
194	// the template parameters.
195	ParsingDeclSpec DS(*this, &DiagsFromTParams);
196
197	ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
198	getDeclSpecContextFromDeclaratorContext(Context));
199
200	if (Tok.is(tok::semi)) {
201	ProhibitAttributes(prefixAttrs);
202	DeclEnd = ConsumeToken();
203	RecordDecl *AnonRecord = nullptr;
204	Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
205	getCurScope(), AS, DS,
206	TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
207	: MultiTemplateParamsArg(),
208	TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
209	AnonRecord);
210	(0) . __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 211, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!AnonRecord &&
211	(0) . __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 211, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Anonymous unions/structs should not be valid with template");
212	DS.complete(Decl);
213	return Decl;
214	}
215
216	// Move the attributes from the prefix into the DS.
217	if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
218	ProhibitAttributes(prefixAttrs);
219	else
220	DS.takeAttributesFrom(prefixAttrs);
221
222	// Parse the declarator.
223	ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
224	ParseDeclarator(DeclaratorInfo);
225	// Error parsing the declarator?
226	if (!DeclaratorInfo.hasName()) {
227	// If so, skip until the semi-colon or a }.
228	SkipUntil(tok::r_brace, StopAtSemi \| StopBeforeMatch);
229	if (Tok.is(tok::semi))
230	ConsumeToken();
231	return nullptr;
232	}
233
234	LateParsedAttrList LateParsedAttrs(true);
235	if (DeclaratorInfo.isFunctionDeclarator())
236	MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
237
238	if (DeclaratorInfo.isFunctionDeclarator() &&
239	isStartOfFunctionDefinition(DeclaratorInfo)) {
240
241	// Function definitions are only allowed at file scope and in C++ classes.
242	// The C++ inline method definition case is handled elsewhere, so we only
243	// need to handle the file scope definition case.
244	if (Context != DeclaratorContext::FileContext) {
245	Diag(Tok, diag::err_function_definition_not_allowed);
246	SkipMalformedDecl();
247	return nullptr;
248	}
249
250	if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
251	// Recover by ignoring the 'typedef'. This was probably supposed to be
252	// the 'typename' keyword, which we should have already suggested adding
253	// if it's appropriate.
254	Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
255	<< FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
256	DS.ClearStorageClassSpecs();
257	}
258
259	if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
260	if (DeclaratorInfo.getName().getKind() !=
261	UnqualifiedIdKind::IK_TemplateId) {
262	// If the declarator-id is not a template-id, issue a diagnostic and
263	// recover by ignoring the 'template' keyword.
264	Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
265	return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
266	&LateParsedAttrs);
267	} else {
268	SourceLocation LAngleLoc
269	= PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
270	Diag(DeclaratorInfo.getIdentifierLoc(),
271	diag::err_explicit_instantiation_with_definition)
272	<< SourceRange(TemplateInfo.TemplateLoc)
273	<< FixItHint::CreateInsertion(LAngleLoc, "<>");
274
275	// Recover as if it were an explicit specialization.
276	TemplateParameterLists FakedParamLists;
277	FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
278	0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
279	LAngleLoc, nullptr));
280
281	return ParseFunctionDefinition(
282	DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
283	/isSpecialization=/true,
284	/LastParamListWasEmpty=/true),
285	&LateParsedAttrs);
286	}
287	}
288	return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
289	&LateParsedAttrs);
290	}
291
292	// Parse this declaration.
293	Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
294	TemplateInfo);
295
296	if (Tok.is(tok::comma)) {
297	Diag(Tok, diag::err_multiple_template_declarators)
298	<< (int)TemplateInfo.Kind;
299	SkipUntil(tok::semi);
300	return ThisDecl;
301	}
302
303	// Eat the semi colon after the declaration.
304	ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
305	if (LateParsedAttrs.size() > 0)
306	ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
307	DeclaratorInfo.complete(ThisDecl);
308	return ThisDecl;
309	}
310
311	/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
312	/// angle brackets. Depth is the depth of this template-parameter-list, which
313	/// is the number of template headers directly enclosing this template header.
314	/// TemplateParams is the current list of template parameters we're building.
315	/// The template parameter we parse will be added to this list. LAngleLoc and
316	/// RAngleLoc will receive the positions of the '<' and '>', respectively,
317	/// that enclose this template parameter list.
318	///
319	/// \returns true if an error occurred, false otherwise.
320	bool Parser::ParseTemplateParameters(
321	unsigned Depth, SmallVectorImpl<NamedDecl *> &TemplateParams,
322	SourceLocation &LAngleLoc, SourceLocation &RAngleLoc) {
323	// Get the template parameter list.
324	if (!TryConsumeToken(tok::less, LAngleLoc)) {
325	Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
326	return true;
327	}
328
329	// Try to parse the template parameter list.
330	bool Failed = false;
331	if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
332	Failed = ParseTemplateParameterList(Depth, TemplateParams);
333
334	if (Tok.is(tok::greatergreater)) {
335	// No diagnostic required here: a template-parameter-list can only be
336	// followed by a declaration or, for a template template parameter, the
337	// 'class' keyword. Therefore, the second '>' will be diagnosed later.
338	// This matters for elegant diagnosis of:
339	// template<template<typename>> struct S;
340	Tok.setKind(tok::greater);
341	RAngleLoc = Tok.getLocation();
342	Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
343	} else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
344	Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
345	return true;
346	}
347	return false;
348	}
349
350	/// ParseTemplateParameterList - Parse a template parameter list. If
351	/// the parsing fails badly (i.e., closing bracket was left out), this
352	/// will try to put the token stream in a reasonable position (closing
353	/// a statement, etc.) and return false.
354	///
355	/// template-parameter-list: [C++ temp]
356	/// template-parameter
357	/// template-parameter-list ',' template-parameter
358	bool
359	Parser::ParseTemplateParameterList(const unsigned Depth,
360	SmallVectorImpl<NamedDecl*> &TemplateParams) {
361	while (1) {
362
363	if (NamedDecl *TmpParam
364	= ParseTemplateParameter(Depth, TemplateParams.size())) {
365	TemplateParams.push_back(TmpParam);
366	} else {
367	// If we failed to parse a template parameter, skip until we find
368	// a comma or closing brace.
369	SkipUntil(tok::comma, tok::greater, tok::greatergreater,
370	StopAtSemi \| StopBeforeMatch);
371	}
372
373	// Did we find a comma or the end of the template parameter list?
374	if (Tok.is(tok::comma)) {
375	ConsumeToken();
376	} else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
377	// Don't consume this... that's done by template parser.
378	break;
379	} else {
380	// Somebody probably forgot to close the template. Skip ahead and
381	// try to get out of the expression. This error is currently
382	// subsumed by whatever goes on in ParseTemplateParameter.
383	Diag(Tok.getLocation(), diag::err_expected_comma_greater);
384	SkipUntil(tok::comma, tok::greater, tok::greatergreater,
385	StopAtSemi \| StopBeforeMatch);
386	return false;
387	}
388	}
389	return true;
390	}
391
392	/// Determine whether the parser is at the start of a template
393	/// type parameter.
394	bool Parser::isStartOfTemplateTypeParameter() {
395	if (Tok.is(tok::kw_class)) {
396	// "class" may be the start of an elaborated-type-specifier or a
397	// type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
398	switch (NextToken().getKind()) {
399	case tok::equal:
400	case tok::comma:
401	case tok::greater:
402	case tok::greatergreater:
403	case tok::ellipsis:
404	return true;
405
406	case tok::identifier:
407	// This may be either a type-parameter or an elaborated-type-specifier.
408	// We have to look further.
409	break;
410
411	default:
412	return false;
413	}
414
415	switch (GetLookAheadToken(2).getKind()) {
416	case tok::equal:
417	case tok::comma:
418	case tok::greater:
419	case tok::greatergreater:
420	return true;
421
422	default:
423	return false;
424	}
425	}
426
427	// 'typedef' is a reasonably-common typo/thinko for 'typename', and is
428	// ill-formed otherwise.
429	if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
430	return false;
431
432	// C++ [temp.param]p2:
433	// There is no semantic difference between class and typename in a
434	// template-parameter. typename followed by an unqualified-id
435	// names a template type parameter. typename followed by a
436	// qualified-id denotes the type in a non-type
437	// parameter-declaration.
438	Token Next = NextToken();
439
440	// If we have an identifier, skip over it.
441	if (Next.getKind() == tok::identifier)
442	Next = GetLookAheadToken(2);
443
444	switch (Next.getKind()) {
445	case tok::equal:
446	case tok::comma:
447	case tok::greater:
448	case tok::greatergreater:
449	case tok::ellipsis:
450	return true;
451
452	case tok::kw_typename:
453	case tok::kw_typedef:
454	case tok::kw_class:
455	// These indicate that a comma was missed after a type parameter, not that
456	// we have found a non-type parameter.
457	return true;
458
459	default:
460	return false;
461	}
462	}
463
464	/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
465	///
466	/// template-parameter: [C++ temp.param]
467	/// type-parameter
468	/// parameter-declaration
469	///
470	/// type-parameter: (see below)
471	/// 'class' ...[opt] identifier[opt]
472	/// 'class' identifier[opt] '=' type-id
473	/// 'typename' ...[opt] identifier[opt]
474	/// 'typename' identifier[opt] '=' type-id
475	/// 'template' '<' template-parameter-list '>'
476	/// 'class' ...[opt] identifier[opt]
477	/// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
478	/// = id-expression
479	NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
480	if (isStartOfTemplateTypeParameter()) {
481	// Is there just a typo in the input code? ('typedef' instead of 'typename')
482	if (Tok.is(tok::kw_typedef)) {
483	Diag(Tok.getLocation(), diag::err_expected_template_parameter);
484
485	Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
486	<< FixItHint::CreateReplacement(CharSourceRange::getCharRange(
487	Tok.getLocation(), Tok.getEndLoc()),
488	"typename");
489
490	Tok.setKind(tok::kw_typename);
491	}
492
493	return ParseTypeParameter(Depth, Position);
494	}
495
496	if (Tok.is(tok::kw_template))
497	return ParseTemplateTemplateParameter(Depth, Position);
498
499	// If it's none of the above, then it must be a parameter declaration.
500	// NOTE: This will pick up errors in the closure of the template parameter
501	// list (e.g., template < ; Check here to implement >> style closures.
502	return ParseNonTypeTemplateParameter(Depth, Position);
503	}
504
505	/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
506	/// Other kinds of template parameters are parsed in
507	/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
508	///
509	/// type-parameter: [C++ temp.param]
510	/// 'class' ...[opt][C++0x] identifier[opt]
511	/// 'class' identifier[opt] '=' type-id
512	/// 'typename' ...[opt][C++0x] identifier[opt]
513	/// 'typename' identifier[opt] '=' type-id
514	NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
515	(0) . __assert_fail ("Tok.isOneOf(tok..kw_class, tok..kw_typename) && \"A type-parameter starts with 'class' or 'typename'\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 516, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.isOneOf(tok::kw_class, tok::kw_typename) &&
516	(0) . __assert_fail ("Tok.isOneOf(tok..kw_class, tok..kw_typename) && \"A type-parameter starts with 'class' or 'typename'\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 516, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "A type-parameter starts with 'class' or 'typename'");
517
518	// Consume the 'class' or 'typename' keyword.
519	bool TypenameKeyword = Tok.is(tok::kw_typename);
520	SourceLocation KeyLoc = ConsumeToken();
521
522	// Grab the ellipsis (if given).
523	SourceLocation EllipsisLoc;
524	if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
525	Diag(EllipsisLoc,
526	getLangOpts().CPlusPlus11
527	? diag::warn_cxx98_compat_variadic_templates
528	: diag::ext_variadic_templates);
529	}
530
531	// Grab the template parameter name (if given)
532	SourceLocation NameLoc;
533	IdentifierInfo *ParamName = nullptr;
534	if (Tok.is(tok::identifier)) {
535	ParamName = Tok.getIdentifierInfo();
536	NameLoc = ConsumeToken();
537	} else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
538	tok::greatergreater)) {
539	// Unnamed template parameter. Don't have to do anything here, just
540	// don't consume this token.
541	} else {
542	Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
543	return nullptr;
544	}
545
546	// Recover from misplaced ellipsis.
547	bool AlreadyHasEllipsis = EllipsisLoc.isValid();
548	if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
549	DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
550
551	// Grab a default argument (if available).
552	// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
553	// we introduce the type parameter into the local scope.
554	SourceLocation EqualLoc;
555	ParsedType DefaultArg;
556	if (TryConsumeToken(tok::equal, EqualLoc))
557	DefaultArg = ParseTypeName(/Range=/nullptr,
558	DeclaratorContext::TemplateTypeArgContext).get();
559
560	return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
561	KeyLoc, ParamName, NameLoc, Depth, Position,
562	EqualLoc, DefaultArg);
563	}
564
565	/// ParseTemplateTemplateParameter - Handle the parsing of template
566	/// template parameters.
567	///
568	/// type-parameter: [C++ temp.param]
569	/// 'template' '<' template-parameter-list '>' type-parameter-key
570	/// ...[opt] identifier[opt]
571	/// 'template' '<' template-parameter-list '>' type-parameter-key
572	/// identifier[opt] = id-expression
573	/// type-parameter-key:
574	/// 'class'
575	/// 'typename' [C++1z]
576	NamedDecl *
577	Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
578	(0) . __assert_fail ("Tok.is(tok..kw_template) && \"Expected 'template' keyword\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 578, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
579
580	// Handle the template <...> part.
581	SourceLocation TemplateLoc = ConsumeToken();
582	SmallVector<NamedDecl*,8> TemplateParams;
583	SourceLocation LAngleLoc, RAngleLoc;
584	{
585	ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
586	if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
587	RAngleLoc)) {
588	return nullptr;
589	}
590	}
591
592	// Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
593	// Generate a meaningful error if the user forgot to put class before the
594	// identifier, comma, or greater. Provide a fixit if the identifier, comma,
595	// or greater appear immediately or after 'struct'. In the latter case,
596	// replace the keyword with 'class'.
597	if (!TryConsumeToken(tok::kw_class)) {
598	bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
599	const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
600	if (Tok.is(tok::kw_typename)) {
601	Diag(Tok.getLocation(),
602	getLangOpts().CPlusPlus17
603	? diag::warn_cxx14_compat_template_template_param_typename
604	: diag::ext_template_template_param_typename)
605	<< (!getLangOpts().CPlusPlus17
606	? FixItHint::CreateReplacement(Tok.getLocation(), "class")
607	: FixItHint());
608	} else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
609	tok::greatergreater, tok::ellipsis)) {
610	Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
611	<< (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
612	: FixItHint::CreateInsertion(Tok.getLocation(), "class "));
613	} else
614	Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
615
616	if (Replace)
617	ConsumeToken();
618	}
619
620	// Parse the ellipsis, if given.
621	SourceLocation EllipsisLoc;
622	if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
623	Diag(EllipsisLoc,
624	getLangOpts().CPlusPlus11
625	? diag::warn_cxx98_compat_variadic_templates
626	: diag::ext_variadic_templates);
627
628	// Get the identifier, if given.
629	SourceLocation NameLoc;
630	IdentifierInfo *ParamName = nullptr;
631	if (Tok.is(tok::identifier)) {
632	ParamName = Tok.getIdentifierInfo();
633	NameLoc = ConsumeToken();
634	} else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
635	tok::greatergreater)) {
636	// Unnamed template parameter. Don't have to do anything here, just
637	// don't consume this token.
638	} else {
639	Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
640	return nullptr;
641	}
642
643	// Recover from misplaced ellipsis.
644	bool AlreadyHasEllipsis = EllipsisLoc.isValid();
645	if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
646	DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
647
648	TemplateParameterList *ParamList =
649	Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
650	TemplateLoc, LAngleLoc,
651	TemplateParams,
652	RAngleLoc, nullptr);
653
654	// Grab a default argument (if available).
655	// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
656	// we introduce the template parameter into the local scope.
657	SourceLocation EqualLoc;
658	ParsedTemplateArgument DefaultArg;
659	if (TryConsumeToken(tok::equal, EqualLoc)) {
660	DefaultArg = ParseTemplateTemplateArgument();
661	if (DefaultArg.isInvalid()) {
662	Diag(Tok.getLocation(),
663	diag::err_default_template_template_parameter_not_template);
664	SkipUntil(tok::comma, tok::greater, tok::greatergreater,
665	StopAtSemi \| StopBeforeMatch);
666	}
667	}
668
669	return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
670	ParamList, EllipsisLoc,
671	ParamName, NameLoc, Depth,
672	Position, EqualLoc, DefaultArg);
673	}
674
675	/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
676	/// template parameters (e.g., in "template<int Size> class array;").
677	///
678	/// template-parameter:
679	/// ...
680	/// parameter-declaration
681	NamedDecl *
682	Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
683	// Parse the declaration-specifiers (i.e., the type).
684	// FIXME: The type should probably be restricted in some way... Not all
685	// declarators (parts of declarators?) are accepted for parameters.
686	DeclSpec DS(AttrFactory);
687	ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
688	DeclSpecContext::DSC_template_param);
689
690	// Parse this as a typename.
691	Declarator ParamDecl(DS, DeclaratorContext::TemplateParamContext);
692	ParseDeclarator(ParamDecl);
693	if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
694	Diag(Tok.getLocation(), diag::err_expected_template_parameter);
695	return nullptr;
696	}
697
698	// Recover from misplaced ellipsis.
699	SourceLocation EllipsisLoc;
700	if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
701	DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
702
703	// If there is a default value, parse it.
704	// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
705	// we introduce the template parameter into the local scope.
706	SourceLocation EqualLoc;
707	ExprResult DefaultArg;
708	if (TryConsumeToken(tok::equal, EqualLoc)) {
709	// C++ [temp.param]p15:
710	// When parsing a default template-argument for a non-type
711	// template-parameter, the first non-nested > is taken as the
712	// end of the template-parameter-list rather than a greater-than
713	// operator.
714	GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
715	EnterExpressionEvaluationContext ConstantEvaluated(
716	Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
717
718	DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
719	if (DefaultArg.isInvalid())
720	SkipUntil(tok::comma, tok::greater, StopAtSemi \| StopBeforeMatch);
721	}
722
723	// Create the parameter.
724	return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
725	Depth, Position, EqualLoc,
726	DefaultArg.get());
727	}
728
729	void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
730	SourceLocation CorrectLoc,
731	bool AlreadyHasEllipsis,
732	bool IdentifierHasName) {
733	FixItHint Insertion;
734	if (!AlreadyHasEllipsis)
735	Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
736	Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
737	<< FixItHint::CreateRemoval(EllipsisLoc) << Insertion
738	<< !IdentifierHasName;
739	}
740
741	void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
742	Declarator &D) {
743	assert(EllipsisLoc.isValid());
744	bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
745	if (!AlreadyHasEllipsis)
746	D.setEllipsisLoc(EllipsisLoc);
747	DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
748	AlreadyHasEllipsis, D.hasName());
749	}
750
751	/// Parses a '>' at the end of a template list.
752	///
753	/// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
754	/// to determine if these tokens were supposed to be a '>' followed by
755	/// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
756	///
757	/// \param RAngleLoc the location of the consumed '>'.
758	///
759	/// \param ConsumeLastToken if true, the '>' is consumed.
760	///
761	/// \param ObjCGenericList if true, this is the '>' closing an Objective-C
762	/// type parameter or type argument list, rather than a C++ template parameter
763	/// or argument list.
764	///
765	/// \returns true, if current token does not start with '>', false otherwise.
766	bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
767	bool ConsumeLastToken,
768	bool ObjCGenericList) {
769	// What will be left once we've consumed the '>'.
770	tok::TokenKind RemainingToken;
771	const char *ReplacementStr = "> >";
772	bool MergeWithNextToken = false;
773
774	switch (Tok.getKind()) {
775	default:
776	Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
777	return true;
778
779	case tok::greater:
780	// Determine the location of the '>' token. Only consume this token
781	// if the caller asked us to.
782	RAngleLoc = Tok.getLocation();
783	if (ConsumeLastToken)
784	ConsumeToken();
785	return false;
786
787	case tok::greatergreater:
788	RemainingToken = tok::greater;
789	break;
790
791	case tok::greatergreatergreater:
792	RemainingToken = tok::greatergreater;
793	break;
794
795	case tok::greaterequal:
796	RemainingToken = tok::equal;
797	ReplacementStr = "> =";
798
799	// Join two adjacent '=' tokens into one, for cases like:
800	// void (*p)() = f<int>;
801	// return f<int>==p;
802	if (NextToken().is(tok::equal) &&
803	areTokensAdjacent(Tok, NextToken())) {
804	RemainingToken = tok::equalequal;
805	MergeWithNextToken = true;
806	}
807	break;
808
809	case tok::greatergreaterequal:
810	RemainingToken = tok::greaterequal;
811	break;
812	}
813
814	// This template-id is terminated by a token that starts with a '>'.
815	// Outside C++11 and Objective-C, this is now error recovery.
816	//
817	// C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
818	// extend that treatment to also apply to the '>>>' token.
819	//
820	// Objective-C allows this in its type parameter / argument lists.
821
822	SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
823	SourceLocation TokLoc = Tok.getLocation();
824	Token Next = NextToken();
825
826	// Whether splitting the current token after the '>' would undesirably result
827	// in the remaining token pasting with the token after it. This excludes the
828	// MergeWithNextToken cases, which we've already handled.
829	bool PreventMergeWithNextToken =
830	(RemainingToken == tok::greater \|\|
831	RemainingToken == tok::greatergreater) &&
832	(Next.isOneOf(tok::greater, tok::greatergreater,
833	tok::greatergreatergreater, tok::equal, tok::greaterequal,
834	tok::greatergreaterequal, tok::equalequal)) &&
835	areTokensAdjacent(Tok, Next);
836
837	// Diagnose this situation as appropriate.
838	if (!ObjCGenericList) {
839	// The source range of the replaced token(s).
840	CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
841	TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
842	getLangOpts()));
843
844	// A hint to put a space between the '>>'s. In order to make the hint as
845	// clear as possible, we include the characters either side of the space in
846	// the replacement, rather than just inserting a space at SecondCharLoc.
847	FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
848	ReplacementStr);
849
850	// A hint to put another space after the token, if it would otherwise be
851	// lexed differently.
852	FixItHint Hint2;
853	if (PreventMergeWithNextToken)
854	Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
855
856	unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
857	if (getLangOpts().CPlusPlus11 &&
858	(Tok.is(tok::greatergreater) \|\| Tok.is(tok::greatergreatergreater)))
859	DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
860	else if (Tok.is(tok::greaterequal))
861	DiagId = diag::err_right_angle_bracket_equal_needs_space;
862	Diag(TokLoc, DiagId) << Hint1 << Hint2;
863	}
864
865	// Find the "length" of the resulting '>' token. This is not always 1, as it
866	// can contain escaped newlines.
867	unsigned GreaterLength = Lexer::getTokenPrefixLength(
868	TokLoc, 1, PP.getSourceManager(), getLangOpts());
869
870	// Annotate the source buffer to indicate that we split the token after the
871	// '>'. This allows us to properly find the end of, and extract the spelling
872	// of, the '>' token later.
873	RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
874
875	// Strip the initial '>' from the token.
876	bool CachingTokens = PP.IsPreviousCachedToken(Tok);
877
878	Token Greater = Tok;
879	Greater.setLocation(RAngleLoc);
880	Greater.setKind(tok::greater);
881	Greater.setLength(GreaterLength);
882
883	unsigned OldLength = Tok.getLength();
884	if (MergeWithNextToken) {
885	ConsumeToken();
886	OldLength += Tok.getLength();
887	}
888
889	Tok.setKind(RemainingToken);
890	Tok.setLength(OldLength - GreaterLength);
891
892	// Split the second token if lexing it normally would lex a different token
893	// (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
894	SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
895	if (PreventMergeWithNextToken)
896	AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
897	Tok.setLocation(AfterGreaterLoc);
898
899	// Update the token cache to match what we just did if necessary.
900	if (CachingTokens) {
901	// If the previous cached token is being merged, delete it.
902	if (MergeWithNextToken)
903	PP.ReplacePreviousCachedToken({});
904
905	if (ConsumeLastToken)
906	PP.ReplacePreviousCachedToken({Greater, Tok});
907	else
908	PP.ReplacePreviousCachedToken({Greater});
909	}
910
911	if (ConsumeLastToken) {
912	PrevTokLocation = RAngleLoc;
913	} else {
914	PrevTokLocation = TokBeforeGreaterLoc;
915	PP.EnterToken(Tok);
916	Tok = Greater;
917	}
918
919	return false;
920	}
921
922
923	/// Parses a template-id that after the template name has
924	/// already been parsed.
925	///
926	/// This routine takes care of parsing the enclosed template argument
927	/// list ('<' template-parameter-list [opt] '>') and placing the
928	/// results into a form that can be transferred to semantic analysis.
929	///
930	/// \param ConsumeLastToken if true, then we will consume the last
931	/// token that forms the template-id. Otherwise, we will leave the
932	/// last token in the stream (e.g., so that it can be replaced with an
933	/// annotation token).
934	bool
935	Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
936	SourceLocation &LAngleLoc,
937	TemplateArgList &TemplateArgs,
938	SourceLocation &RAngleLoc) {
939	(0) . __assert_fail ("Tok.is(tok..less) && \"Must have already parsed the template-name\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 939, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.is(tok::less) && "Must have already parsed the template-name");
940
941	// Consume the '<'.
942	LAngleLoc = ConsumeToken();
943
944	// Parse the optional template-argument-list.
945	bool Invalid = false;
946	{
947	GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
948	if (!Tok.isOneOf(tok::greater, tok::greatergreater,
949	tok::greatergreatergreater, tok::greaterequal,
950	tok::greatergreaterequal))
951	Invalid = ParseTemplateArgumentList(TemplateArgs);
952
953	if (Invalid) {
954	// Try to find the closing '>'.
955	if (ConsumeLastToken)
956	SkipUntil(tok::greater, StopAtSemi);
957	else
958	SkipUntil(tok::greater, StopAtSemi \| StopBeforeMatch);
959	return true;
960	}
961	}
962
963	return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken,
964	/ObjCGenericList=/false);
965	}
966
967	/// Replace the tokens that form a simple-template-id with an
968	/// annotation token containing the complete template-id.
969	///
970	/// The first token in the stream must be the name of a template that
971	/// is followed by a '<'. This routine will parse the complete
972	/// simple-template-id and replace the tokens with a single annotation
973	/// token with one of two different kinds: if the template-id names a
974	/// type (and \p AllowTypeAnnotation is true), the annotation token is
975	/// a type annotation that includes the optional nested-name-specifier
976	/// (\p SS). Otherwise, the annotation token is a template-id
977	/// annotation that does not include the optional
978	/// nested-name-specifier.
979	///
980	/// \param Template the declaration of the template named by the first
981	/// token (an identifier), as returned from \c Action::isTemplateName().
982	///
983	/// \param TNK the kind of template that \p Template
984	/// refers to, as returned from \c Action::isTemplateName().
985	///
986	/// \param SS if non-NULL, the nested-name-specifier that precedes
987	/// this template name.
988	///
989	/// \param TemplateKWLoc if valid, specifies that this template-id
990	/// annotation was preceded by the 'template' keyword and gives the
991	/// location of that keyword. If invalid (the default), then this
992	/// template-id was not preceded by a 'template' keyword.
993	///
994	/// \param AllowTypeAnnotation if true (the default), then a
995	/// simple-template-id that refers to a class template, template
996	/// template parameter, or other template that produces a type will be
997	/// replaced with a type annotation token. Otherwise, the
998	/// simple-template-id is always replaced with a template-id
999	/// annotation token.
1000	///
1001	/// If an unrecoverable parse error occurs and no annotation token can be
1002	/// formed, this function returns true.
1003	///
1004	bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
1005	CXXScopeSpec &SS,
1006	SourceLocation TemplateKWLoc,
1007	UnqualifiedId &TemplateName,
1008	bool AllowTypeAnnotation) {
1009	(0) . __assert_fail ("getLangOpts().CPlusPlus && \"Can only annotate template-ids in C++\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1009, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
1010	(0) . __assert_fail ("Template && Tok.is(tok..less) && \"Parser isn't at the beginning of a template-id\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1011, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Template && Tok.is(tok::less) &&
1011	(0) . __assert_fail ("Template && Tok.is(tok..less) && \"Parser isn't at the beginning of a template-id\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1011, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Parser isn't at the beginning of a template-id");
1012
1013	// Consume the template-name.
1014	SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
1015
1016	// Parse the enclosed template argument list.
1017	SourceLocation LAngleLoc, RAngleLoc;
1018	TemplateArgList TemplateArgs;
1019	bool Invalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
1020	TemplateArgs,
1021	RAngleLoc);
1022
1023	if (Invalid) {
1024	// If we failed to parse the template ID but skipped ahead to a >, we're not
1025	// going to be able to form a token annotation. Eat the '>' if present.
1026	TryConsumeToken(tok::greater);
1027	return true;
1028	}
1029
1030	ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
1031
1032	// Build the annotation token.
1033	if (TNK == TNK_Type_template && AllowTypeAnnotation) {
1034	TypeResult Type = Actions.ActOnTemplateIdType(
1035	SS, TemplateKWLoc, Template, TemplateName.Identifier,
1036	TemplateNameLoc, LAngleLoc, TemplateArgsPtr, RAngleLoc);
1037	if (Type.isInvalid()) {
1038	// If we failed to parse the template ID but skipped ahead to a >, we're
1039	// not going to be able to form a token annotation. Eat the '>' if
1040	// present.
1041	TryConsumeToken(tok::greater);
1042	return true;
1043	}
1044
1045	Tok.setKind(tok::annot_typename);
1046	setTypeAnnotation(Tok, Type.get());
1047	if (SS.isNotEmpty())
1048	Tok.setLocation(SS.getBeginLoc());
1049	else if (TemplateKWLoc.isValid())
1050	Tok.setLocation(TemplateKWLoc);
1051	else
1052	Tok.setLocation(TemplateNameLoc);
1053	} else {
1054	// Build a template-id annotation token that can be processed
1055	// later.
1056	Tok.setKind(tok::annot_template_id);
1057
1058	IdentifierInfo *TemplateII =
1059	TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1060	? TemplateName.Identifier
1061	: nullptr;
1062
1063	OverloadedOperatorKind OpKind =
1064	TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1065	? OO_None
1066	: TemplateName.OperatorFunctionId.Operator;
1067
1068	TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
1069	SS, TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1070	LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
1071
1072	Tok.setAnnotationValue(TemplateId);
1073	if (TemplateKWLoc.isValid())
1074	Tok.setLocation(TemplateKWLoc);
1075	else
1076	Tok.setLocation(TemplateNameLoc);
1077	}
1078
1079	// Common fields for the annotation token
1080	Tok.setAnnotationEndLoc(RAngleLoc);
1081
1082	// In case the tokens were cached, have Preprocessor replace them with the
1083	// annotation token.
1084	PP.AnnotateCachedTokens(Tok);
1085	return false;
1086	}
1087
1088	/// Replaces a template-id annotation token with a type
1089	/// annotation token.
1090	///
1091	/// If there was a failure when forming the type from the template-id,
1092	/// a type annotation token will still be created, but will have a
1093	/// NULL type pointer to signify an error.
1094	///
1095	/// \param IsClassName Is this template-id appearing in a context where we
1096	/// know it names a class, such as in an elaborated-type-specifier or
1097	/// base-specifier? ('typename' and 'template' are unneeded and disallowed
1098	/// in those contexts.)
1099	void Parser::AnnotateTemplateIdTokenAsType(bool IsClassName) {
1100	(0) . __assert_fail ("Tok.is(tok..annot_template_id) && \"Requires template-id tokens\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1100, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
1101
1102	TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1103	(0) . __assert_fail ("(TemplateId->Kind == TNK_Type_template \|\| TemplateId->Kind == TNK_Dependent_template_name) && \"Only works for type and dependent templates\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1105, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((TemplateId->Kind == TNK_Type_template \|\|
1104	(0) . __assert_fail ("(TemplateId->Kind == TNK_Type_template \|\| TemplateId->Kind == TNK_Dependent_template_name) && \"Only works for type and dependent templates\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1105, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> TemplateId->Kind == TNK_Dependent_template_name) &&
1105	(0) . __assert_fail ("(TemplateId->Kind == TNK_Type_template \|\| TemplateId->Kind == TNK_Dependent_template_name) && \"Only works for type and dependent templates\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1105, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Only works for type and dependent templates");
1106
1107	ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1108	TemplateId->NumArgs);
1109
1110	TypeResult Type
1111	= Actions.ActOnTemplateIdType(TemplateId->SS,
1112	TemplateId->TemplateKWLoc,
1113	TemplateId->Template,
1114	TemplateId->Name,
1115	TemplateId->TemplateNameLoc,
1116	TemplateId->LAngleLoc,
1117	TemplateArgsPtr,
1118	TemplateId->RAngleLoc,
1119	/IsCtorOrDtorName/false,
1120	IsClassName);
1121	// Create the new "type" annotation token.
1122	Tok.setKind(tok::annot_typename);
1123	setTypeAnnotation(Tok, Type.isInvalid() ? nullptr : Type.get());
1124	if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
1125	Tok.setLocation(TemplateId->SS.getBeginLoc());
1126	// End location stays the same
1127
1128	// Replace the template-id annotation token, and possible the scope-specifier
1129	// that precedes it, with the typename annotation token.
1130	PP.AnnotateCachedTokens(Tok);
1131	}
1132
1133	/// Determine whether the given token can end a template argument.
1134	static bool isEndOfTemplateArgument(Token Tok) {
1135	return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater);
1136	}
1137
1138	/// Parse a C++ template template argument.
1139	ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1140	if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1141	!Tok.is(tok::annot_cxxscope))
1142	return ParsedTemplateArgument();
1143
1144	// C++0x [temp.arg.template]p1:
1145	// A template-argument for a template template-parameter shall be the name
1146	// of a class template or an alias template, expressed as id-expression.
1147	//
1148	// We parse an id-expression that refers to a class template or alias
1149	// template. The grammar we parse is:
1150	//
1151	// nested-name-specifier[opt] template[opt] identifier ...[opt]
1152	//
1153	// followed by a token that terminates a template argument, such as ',',
1154	// '>', or (in some cases) '>>'.
1155	CXXScopeSpec SS; // nested-name-specifier, if present
1156	ParseOptionalCXXScopeSpecifier(SS, nullptr,
1157	/EnteringContext=/false);
1158
1159	ParsedTemplateArgument Result;
1160	SourceLocation EllipsisLoc;
1161	if (SS.isSet() && Tok.is(tok::kw_template)) {
1162	// Parse the optional 'template' keyword following the
1163	// nested-name-specifier.
1164	SourceLocation TemplateKWLoc = ConsumeToken();
1165
1166	if (Tok.is(tok::identifier)) {
1167	// We appear to have a dependent template name.
1168	UnqualifiedId Name;
1169	Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1170	ConsumeToken(); // the identifier
1171
1172	TryConsumeToken(tok::ellipsis, EllipsisLoc);
1173
1174	// If the next token signals the end of a template argument,
1175	// then we have a dependent template name that could be a template
1176	// template argument.
1177	TemplateTy Template;
1178	if (isEndOfTemplateArgument(Tok) &&
1179	Actions.ActOnDependentTemplateName(
1180	getCurScope(), SS, TemplateKWLoc, Name,
1181	/ObjectType=/nullptr,
1182	/EnteringContext=/false, Template))
1183	Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1184	}
1185	} else if (Tok.is(tok::identifier)) {
1186	// We may have a (non-dependent) template name.
1187	TemplateTy Template;
1188	UnqualifiedId Name;
1189	Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1190	ConsumeToken(); // the identifier
1191
1192	TryConsumeToken(tok::ellipsis, EllipsisLoc);
1193
1194	if (isEndOfTemplateArgument(Tok)) {
1195	bool MemberOfUnknownSpecialization;
1196	TemplateNameKind TNK = Actions.isTemplateName(
1197	getCurScope(), SS,
1198	/hasTemplateKeyword=/false, Name,
1199	/ObjectType=/nullptr,
1200	/EnteringContext=/false, Template, MemberOfUnknownSpecialization);
1201	if (TNK == TNK_Dependent_template_name \|\| TNK == TNK_Type_template) {
1202	// We have an id-expression that refers to a class template or
1203	// (C++0x) alias template.
1204	Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1205	}
1206	}
1207	}
1208
1209	// If this is a pack expansion, build it as such.
1210	if (EllipsisLoc.isValid() && !Result.isInvalid())
1211	Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1212
1213	return Result;
1214	}
1215
1216	/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1217	///
1218	/// template-argument: [C++ 14.2]
1219	/// constant-expression
1220	/// type-id
1221	/// id-expression
1222	ParsedTemplateArgument Parser::ParseTemplateArgument() {
1223	// C++ [temp.arg]p2:
1224	// In a template-argument, an ambiguity between a type-id and an
1225	// expression is resolved to a type-id, regardless of the form of
1226	// the corresponding template-parameter.
1227	//
1228	// Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1229	// up and annotate an identifier as an id-expression during disambiguation,
1230	// so enter the appropriate context for a constant expression template
1231	// argument before trying to disambiguate.
1232
1233	EnterExpressionEvaluationContext EnterConstantEvaluated(
1234	Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
1235	/LambdaContextDecl=/nullptr,
1236	/ExprContext=/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
1237	if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1238	TypeResult TypeArg = ParseTypeName(
1239	/Range=/nullptr, DeclaratorContext::TemplateArgContext);
1240	return Actions.ActOnTemplateTypeArgument(TypeArg);
1241	}
1242
1243	// Try to parse a template template argument.
1244	{
1245	TentativeParsingAction TPA(*this);
1246
1247	ParsedTemplateArgument TemplateTemplateArgument
1248	= ParseTemplateTemplateArgument();
1249	if (!TemplateTemplateArgument.isInvalid()) {
1250	TPA.Commit();
1251	return TemplateTemplateArgument;
1252	}
1253
1254	// Revert this tentative parse to parse a non-type template argument.
1255	TPA.Revert();
1256	}
1257
1258	// Parse a non-type template argument.
1259	SourceLocation Loc = Tok.getLocation();
1260	ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
1261	if (ExprArg.isInvalid() \|\| !ExprArg.get())
1262	return ParsedTemplateArgument();
1263
1264	return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1265	ExprArg.get(), Loc);
1266	}
1267
1268	/// Determine whether the current tokens can only be parsed as a
1269	/// template argument list (starting with the '<') and never as a '<'
1270	/// expression.
1271	bool Parser::IsTemplateArgumentList(unsigned Skip) {
1272	struct AlwaysRevertAction : TentativeParsingAction {
1273	AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
1274	~AlwaysRevertAction() { Revert(); }
1275	} Tentative(*this);
1276
1277	while (Skip) {
1278	ConsumeAnyToken();
1279	--Skip;
1280	}
1281
1282	// '<'
1283	if (!TryConsumeToken(tok::less))
1284	return false;
1285
1286	// An empty template argument list.
1287	if (Tok.is(tok::greater))
1288	return true;
1289
1290	// See whether we have declaration specifiers, which indicate a type.
1291	while (isCXXDeclarationSpecifier() == TPResult::True)
1292	ConsumeAnyToken();
1293
1294	// If we have a '>' or a ',' then this is a template argument list.
1295	return Tok.isOneOf(tok::greater, tok::comma);
1296	}
1297
1298	/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1299	/// (C++ [temp.names]). Returns true if there was an error.
1300	///
1301	/// template-argument-list: [C++ 14.2]
1302	/// template-argument
1303	/// template-argument-list ',' template-argument
1304	bool
1305	Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1306
1307	ColonProtectionRAIIObject ColonProtection(*this, false);
1308
1309	do {
1310	ParsedTemplateArgument Arg = ParseTemplateArgument();
1311	SourceLocation EllipsisLoc;
1312	if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1313	Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1314
1315	if (Arg.isInvalid()) {
1316	SkipUntil(tok::comma, tok::greater, StopAtSemi \| StopBeforeMatch);
1317	return true;
1318	}
1319
1320	// Save this template argument.
1321	TemplateArgs.push_back(Arg);
1322
1323	// If the next token is a comma, consume it and keep reading
1324	// arguments.
1325	} while (TryConsumeToken(tok::comma));
1326
1327	return false;
1328	}
1329
1330	/// Parse a C++ explicit template instantiation
1331	/// (C++ [temp.explicit]).
1332	///
1333	/// explicit-instantiation:
1334	/// 'extern' [opt] 'template' declaration
1335	///
1336	/// Note that the 'extern' is a GNU extension and C++11 feature.
1337	Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
1338	SourceLocation ExternLoc,
1339	SourceLocation TemplateLoc,
1340	SourceLocation &DeclEnd,
1341	ParsedAttributes &AccessAttrs,
1342	AccessSpecifier AS) {
1343	// This isn't really required here.
1344	ParsingDeclRAIIObject
1345	ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1346
1347	return ParseSingleDeclarationAfterTemplate(
1348	Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
1349	ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
1350	}
1351
1352	SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1353	if (TemplateParams)
1354	return getTemplateParamsRange(TemplateParams->data(),
1355	TemplateParams->size());
1356
1357	SourceRange R(TemplateLoc);
1358	if (ExternLoc.isValid())
1359	R.setBegin(ExternLoc);
1360	return R;
1361	}
1362
1363	void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1364	((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1365	}
1366
1367	/// Late parse a C++ function template in Microsoft mode.
1368	void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1369	if (!LPT.D)
1370	return;
1371
1372	// Get the FunctionDecl.
1373	FunctionDecl *FunD = LPT.D->getAsFunction();
1374	// Track template parameter depth.
1375	TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1376
1377	// To restore the context after late parsing.
1378	Sema::ContextRAII GlobalSavedContext(
1379	Actions, Actions.Context.getTranslationUnitDecl());
1380
1381	SmallVector<ParseScope*, 4> TemplateParamScopeStack;
1382
1383	// Get the list of DeclContexts to reenter. For inline methods, we only want
1384	// to push the DeclContext of the outermost class. This matches the way the
1385	// parser normally parses bodies of inline methods when the outermost class is
1386	// complete.
1387	struct ContainingDC {
1388	ContainingDC(DeclContext *DC, bool ShouldPush) : Pair(DC, ShouldPush) {}
1389	llvm::PointerIntPair<DeclContext *, 1, bool> Pair;
1390	DeclContext *getDC() { return Pair.getPointer(); }
1391	bool shouldPushDC() { return Pair.getInt(); }
1392	};
1393	SmallVector<ContainingDC, 4> DeclContextsToReenter;
1394	DeclContext *DD = FunD;
1395	DeclContext *NextContaining = Actions.getContainingDC(DD);
1396	while (DD && !DD->isTranslationUnit()) {
1397	bool ShouldPush = DD == NextContaining;
1398	DeclContextsToReenter.push_back({DD, ShouldPush});
1399	if (ShouldPush)
1400	NextContaining = Actions.getContainingDC(DD);
1401	DD = DD->getLexicalParent();
1402	}
1403
1404	// Reenter template scopes from outermost to innermost.
1405	for (ContainingDC CDC : reverse(DeclContextsToReenter)) {
1406	TemplateParamScopeStack.push_back(
1407	new ParseScope(this, Scope::TemplateParamScope));
1408	unsigned NumParamLists = Actions.ActOnReenterTemplateScope(
1409	getCurScope(), cast<Decl>(CDC.getDC()));
1410	CurTemplateDepthTracker.addDepth(NumParamLists);
1411	if (CDC.shouldPushDC()) {
1412	TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
1413	Actions.PushDeclContext(Actions.getCurScope(), CDC.getDC());
1414	}
1415	}
1416
1417	(0) . __assert_fail ("!LPT.Toks.empty() && \"Empty body!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1417, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!LPT.Toks.empty() && "Empty body!");
1418
1419	// Append the current token at the end of the new token stream so that it
1420	// doesn't get lost.
1421	LPT.Toks.push_back(Tok);
1422	PP.EnterTokenStream(LPT.Toks, true);
1423
1424	// Consume the previously pushed token.
1425	ConsumeAnyToken(/ConsumeCodeCompletionTok=/true);
1426	(0) . __assert_fail ("Tok.isOneOf(tok..l_brace, tok..colon, tok..kw_try) && \"Inline method not starting with '{', '.' or 'try'\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1427, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
1427	(0) . __assert_fail ("Tok.isOneOf(tok..l_brace, tok..colon, tok..kw_try) && \"Inline method not starting with '{', '.' or 'try'\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1427, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "Inline method not starting with '{', ':' or 'try'");
1428
1429	// Parse the method body. Function body parsing code is similar enough
1430	// to be re-used for method bodies as well.
1431	ParseScope FnScope(this, Scope::FnScope \| Scope::DeclScope \|
1432	Scope::CompoundStmtScope);
1433
1434	// Recreate the containing function DeclContext.
1435	Sema::ContextRAII FunctionSavedContext(Actions,
1436	Actions.getContainingDC(FunD));
1437
1438	Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1439
1440	if (Tok.is(tok::kw_try)) {
1441	ParseFunctionTryBlock(LPT.D, FnScope);
1442	} else {
1443	if (Tok.is(tok::colon))
1444	ParseConstructorInitializer(LPT.D);
1445	else
1446	Actions.ActOnDefaultCtorInitializers(LPT.D);
1447
1448	if (Tok.is(tok::l_brace)) {
1449	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((!isa<FunctionTemplateDecl>(LPT.D) \|\|
1450	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> cast<FunctionTemplateDecl>(LPT.D)
1451	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> ->getTemplateParameters()
1452	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> ->getDepth() == TemplateParameterDepth - 1) &&
1453	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "TemplateParameterDepth should be greater than the depth of "
1454	(0) . __assert_fail ("(!isa(LPT.D) \|\| cast(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1454, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true"> "current template being instantiated!");
1455	ParseFunctionStatementBody(LPT.D, FnScope);
1456	Actions.UnmarkAsLateParsedTemplate(FunD);
1457	} else
1458	Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1459	}
1460
1461	// Exit scopes.
1462	FnScope.Exit();
1463	SmallVectorImpl<ParseScope *>::reverse_iterator I =
1464	TemplateParamScopeStack.rbegin();
1465	for (; I != TemplateParamScopeStack.rend(); ++I)
1466	delete *I;
1467	}
1468
1469	/// Lex a delayed template function for late parsing.
1470	void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1471	tok::TokenKind kind = Tok.getKind();
1472	if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1473	// Consume everything up to (and including) the matching right brace.
1474	ConsumeAndStoreUntil(tok::r_brace, Toks, /StopAtSemi=/false);
1475	}
1476
1477	// If we're in a function-try-block, we need to store all the catch blocks.
1478	if (kind == tok::kw_try) {
1479	while (Tok.is(tok::kw_catch)) {
1480	ConsumeAndStoreUntil(tok::l_brace, Toks, /StopAtSemi=/false);
1481	ConsumeAndStoreUntil(tok::r_brace, Toks, /StopAtSemi=/false);
1482	}
1483	}
1484	}
1485
1486	/// We've parsed something that could plausibly be intended to be a template
1487	/// name (\p LHS) followed by a '<' token, and the following code can't possibly
1488	/// be an expression. Determine if this is likely to be a template-id and if so,
1489	/// diagnose it.
1490	bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
1491	TentativeParsingAction TPA(*this);
1492	// FIXME: We could look at the token sequence in a lot more detail here.
1493	if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
1494	StopAtSemi \| StopBeforeMatch)) {
1495	TPA.Commit();
1496
1497	SourceLocation Greater;
1498	ParseGreaterThanInTemplateList(Greater, true, false);
1499	Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
1500	Less, Greater);
1501	return true;
1502	}
1503
1504	// There's no matching '>' token, this probably isn't supposed to be
1505	// interpreted as a template-id. Parse it as an (ill-formed) comparison.
1506	TPA.Revert();
1507	return false;
1508	}
1509
1510	void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
1511	(0) . __assert_fail ("Tok.is(tok..less) && \"not at a potential angle bracket\"", "/home/seafit/code_projects/clang_source/clang/lib/Parse/ParseTemplate.cpp", 1511, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(Tok.is(tok::less) && "not at a potential angle bracket");
1512
1513	bool DependentTemplateName = false;
1514	if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
1515	DependentTemplateName))
1516	return;
1517
1518	// OK, this might be a name that the user intended to be parsed as a
1519	// template-name, followed by a '<' token. Check for some easy cases.
1520
1521	// If we have potential_template<>, then it's supposed to be a template-name.
1522	if (NextToken().is(tok::greater) \|\|
1523	(getLangOpts().CPlusPlus11 &&
1524	NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
1525	SourceLocation Less = ConsumeToken();
1526	SourceLocation Greater;
1527	ParseGreaterThanInTemplateList(Greater, true, false);
1528	Actions.diagnoseExprIntendedAsTemplateName(
1529	getCurScope(), PotentialTemplateName, Less, Greater);
1530	// FIXME: Perform error recovery.
1531	PotentialTemplateName = ExprError();
1532	return;
1533	}
1534
1535	// If we have 'potential_template<type-id', assume it's supposed to be a
1536	// template-name if there's a matching '>' later on.
1537	{
1538	// FIXME: Avoid the tentative parse when NextToken() can't begin a type.
1539	TentativeParsingAction TPA(*this);
1540	SourceLocation Less = ConsumeToken();
1541	if (isTypeIdUnambiguously() &&
1542	diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
1543	TPA.Commit();
1544	// FIXME: Perform error recovery.
1545	PotentialTemplateName = ExprError();
1546	return;
1547	}
1548	TPA.Revert();
1549	}
1550
1551	// Otherwise, remember that we saw this in case we see a potentially-matching
1552	// '>' token later on.
1553	AngleBracketTracker::Priority Priority =
1554	(DependentTemplateName ? AngleBracketTracker::DependentName
1555	: AngleBracketTracker::PotentialTypo) \|
1556	(Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
1557	: AngleBracketTracker::NoSpaceBeforeLess);
1558	AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
1559	Priority);
1560	}
1561
1562	bool Parser::checkPotentialAngleBracketDelimiter(
1563	const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
1564	// If a comma in an expression context is followed by a type that can be a
1565	// template argument and cannot be an expression, then this is ill-formed,
1566	// but might be intended to be part of a template-id.
1567	if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
1568	diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
1569	AngleBrackets.clear(*this);
1570	return true;
1571	}
1572
1573	// If a context that looks like a template-id is followed by '()', then
1574	// this is ill-formed, but might be intended to be a template-id
1575	// followed by '()'.
1576	if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
1577	NextToken().is(tok::r_paren)) {
1578	Actions.diagnoseExprIntendedAsTemplateName(
1579	getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
1580	OpToken.getLocation());
1581	AngleBrackets.clear(*this);
1582	return true;
1583	}
1584
1585	// After a '>' (etc), we're no longer potentially in a construct that's
1586	// intended to be treated as a template-id.
1587	if (OpToken.is(tok::greater) \|\|
1588	(getLangOpts().CPlusPlus11 &&
1589	OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
1590	AngleBrackets.clear(*this);
1591	return false;
1592	}
1593