Bug Summary

File:clang/lib/Parse/ParseTemplate.cpp
Warning:line 1680, column 51
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ParseTemplate.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/lib/Parse -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/lib/Parse -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-09-26-161721-17566-1 -x c++ /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/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/AST/ExprCXX.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#include "llvm/Support/TimeProfiler.h"
23using namespace clang;
24
25/// Re-enter a possible template scope, creating as many template parameter
26/// scopes as necessary.
27/// \return The number of template parameter scopes entered.
28unsigned Parser::ReenterTemplateScopes(MultiParseScope &S, Decl *D) {
29 return Actions.ActOnReenterTemplateScope(D, [&] {
30 S.Enter(Scope::TemplateParamScope);
31 return Actions.getCurScope();
32 });
33}
34
35/// Parse a template declaration, explicit instantiation, or
36/// explicit specialization.
37Decl *Parser::ParseDeclarationStartingWithTemplate(
38 DeclaratorContext Context, SourceLocation &DeclEnd,
39 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
40 ObjCDeclContextSwitch ObjCDC(*this);
41
42 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
43 return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
44 DeclEnd, AccessAttrs, AS);
45 }
46 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
47 AS);
48}
49
50/// Parse a template declaration or an explicit specialization.
51///
52/// Template declarations include one or more template parameter lists
53/// and either the function or class template declaration. Explicit
54/// specializations contain one or more 'template < >' prefixes
55/// followed by a (possibly templated) declaration. Since the
56/// syntactic form of both features is nearly identical, we parse all
57/// of the template headers together and let semantic analysis sort
58/// the declarations from the explicit specializations.
59///
60/// template-declaration: [C++ temp]
61/// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
62///
63/// template-declaration: [C++2a]
64/// template-head declaration
65/// template-head concept-definition
66///
67/// TODO: requires-clause
68/// template-head: [C++2a]
69/// 'template' '<' template-parameter-list '>'
70/// requires-clause[opt]
71///
72/// explicit-specialization: [ C++ temp.expl.spec]
73/// 'template' '<' '>' declaration
74Decl *Parser::ParseTemplateDeclarationOrSpecialization(
75 DeclaratorContext Context, SourceLocation &DeclEnd,
76 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
77 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&((Tok.isOneOf(tok::kw_export, tok::kw_template) && "Token does not start a template declaration."
) ? static_cast<void> (0) : __assert_fail ("Tok.isOneOf(tok::kw_export, tok::kw_template) && \"Token does not start a template declaration.\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 78, __PRETTY_FUNCTION__))
78 "Token does not start a template declaration.")((Tok.isOneOf(tok::kw_export, tok::kw_template) && "Token does not start a template declaration."
) ? static_cast<void> (0) : __assert_fail ("Tok.isOneOf(tok::kw_export, tok::kw_template) && \"Token does not start a template declaration.\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 78, __PRETTY_FUNCTION__))
;
79
80 MultiParseScope TemplateParamScopes(*this);
81
82 // Tell the action that names should be checked in the context of
83 // the declaration to come.
84 ParsingDeclRAIIObject
85 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
86
87 // Parse multiple levels of template headers within this template
88 // parameter scope, e.g.,
89 //
90 // template<typename T>
91 // template<typename U>
92 // class A<T>::B { ... };
93 //
94 // We parse multiple levels non-recursively so that we can build a
95 // single data structure containing all of the template parameter
96 // lists to easily differentiate between the case above and:
97 //
98 // template<typename T>
99 // class A {
100 // template<typename U> class B;
101 // };
102 //
103 // In the first case, the action for declaring A<T>::B receives
104 // both template parameter lists. In the second case, the action for
105 // defining A<T>::B receives just the inner template parameter list
106 // (and retrieves the outer template parameter list from its
107 // context).
108 bool isSpecialization = true;
109 bool LastParamListWasEmpty = false;
110 TemplateParameterLists ParamLists;
111 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
112
113 do {
114 // Consume the 'export', if any.
115 SourceLocation ExportLoc;
116 TryConsumeToken(tok::kw_export, ExportLoc);
117
118 // Consume the 'template', which should be here.
119 SourceLocation TemplateLoc;
120 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
121 Diag(Tok.getLocation(), diag::err_expected_template);
122 return nullptr;
123 }
124
125 // Parse the '<' template-parameter-list '>'
126 SourceLocation LAngleLoc, RAngleLoc;
127 SmallVector<NamedDecl*, 4> TemplateParams;
128 if (ParseTemplateParameters(TemplateParamScopes,
129 CurTemplateDepthTracker.getDepth(),
130 TemplateParams, LAngleLoc, RAngleLoc)) {
131 // Skip until the semi-colon or a '}'.
132 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
133 TryConsumeToken(tok::semi);
134 return nullptr;
135 }
136
137 ExprResult OptionalRequiresClauseConstraintER;
138 if (!TemplateParams.empty()) {
139 isSpecialization = false;
140 ++CurTemplateDepthTracker;
141
142 if (TryConsumeToken(tok::kw_requires)) {
143 OptionalRequiresClauseConstraintER =
144 Actions.CorrectDelayedTyposInExpr(
145 ParseConstraintLogicalOrExpression(
146 /*IsTrailingRequiresClause=*/false));
147 if (!OptionalRequiresClauseConstraintER.isUsable()) {
148 // Skip until the semi-colon or a '}'.
149 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
150 TryConsumeToken(tok::semi);
151 return nullptr;
152 }
153 }
154 } else {
155 LastParamListWasEmpty = true;
156 }
157
158 ParamLists.push_back(Actions.ActOnTemplateParameterList(
159 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
160 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
161 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
162
163 // Parse the actual template declaration.
164 if (Tok.is(tok::kw_concept))
165 return ParseConceptDefinition(
166 ParsedTemplateInfo(&ParamLists, isSpecialization,
167 LastParamListWasEmpty),
168 DeclEnd);
169
170 return ParseSingleDeclarationAfterTemplate(
171 Context,
172 ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
173 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
174}
175
176/// Parse a single declaration that declares a template,
177/// template specialization, or explicit instantiation of a template.
178///
179/// \param DeclEnd will receive the source location of the last token
180/// within this declaration.
181///
182/// \param AS the access specifier associated with this
183/// declaration. Will be AS_none for namespace-scope declarations.
184///
185/// \returns the new declaration.
186Decl *Parser::ParseSingleDeclarationAfterTemplate(
187 DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
188 ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
189 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
190 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&((TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
"Template information required") ? static_cast<void> (
0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 191, __PRETTY_FUNCTION__))
191 "Template information required")((TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
"Template information required") ? static_cast<void> (
0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 191, __PRETTY_FUNCTION__))
;
192
193 if (Tok.is(tok::kw_static_assert)) {
194 // A static_assert declaration may not be templated.
195 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
196 << TemplateInfo.getSourceRange();
197 // Parse the static_assert declaration to improve error recovery.
198 return ParseStaticAssertDeclaration(DeclEnd);
199 }
200
201 if (Context == DeclaratorContext::MemberContext) {
202 // We are parsing a member template.
203 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
204 &DiagsFromTParams);
205 return nullptr;
206 }
207
208 ParsedAttributesWithRange prefixAttrs(AttrFactory);
209 MaybeParseCXX11Attributes(prefixAttrs);
210
211 if (Tok.is(tok::kw_using)) {
212 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
213 prefixAttrs);
214 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
215 return nullptr;
216 return usingDeclPtr.get().getSingleDecl();
217 }
218
219 // Parse the declaration specifiers, stealing any diagnostics from
220 // the template parameters.
221 ParsingDeclSpec DS(*this, &DiagsFromTParams);
222
223 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
224 getDeclSpecContextFromDeclaratorContext(Context));
225
226 if (Tok.is(tok::semi)) {
227 ProhibitAttributes(prefixAttrs);
228 DeclEnd = ConsumeToken();
229 RecordDecl *AnonRecord = nullptr;
230 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
231 getCurScope(), AS, DS,
232 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
233 : MultiTemplateParamsArg(),
234 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
235 AnonRecord);
236 assert(!AnonRecord &&((!AnonRecord && "Anonymous unions/structs should not be valid with template"
) ? static_cast<void> (0) : __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 237, __PRETTY_FUNCTION__))
237 "Anonymous unions/structs should not be valid with template")((!AnonRecord && "Anonymous unions/structs should not be valid with template"
) ? static_cast<void> (0) : __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 237, __PRETTY_FUNCTION__))
;
238 DS.complete(Decl);
239 return Decl;
240 }
241
242 // Move the attributes from the prefix into the DS.
243 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
244 ProhibitAttributes(prefixAttrs);
245 else
246 DS.takeAttributesFrom(prefixAttrs);
247
248 // Parse the declarator.
249 ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
250 if (TemplateInfo.TemplateParams)
251 DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
252 ParseDeclarator(DeclaratorInfo);
253 // Error parsing the declarator?
254 if (!DeclaratorInfo.hasName()) {
255 // If so, skip until the semi-colon or a }.
256 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
257 if (Tok.is(tok::semi))
258 ConsumeToken();
259 return nullptr;
260 }
261
262 llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
263 return std::string(DeclaratorInfo.getIdentifier() != nullptr
264 ? DeclaratorInfo.getIdentifier()->getName()
265 : "<unknown>");
266 });
267
268 LateParsedAttrList LateParsedAttrs(true);
269 if (DeclaratorInfo.isFunctionDeclarator()) {
270 if (Tok.is(tok::kw_requires))
271 ParseTrailingRequiresClause(DeclaratorInfo);
272
273 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
274 }
275
276 if (DeclaratorInfo.isFunctionDeclarator() &&
277 isStartOfFunctionDefinition(DeclaratorInfo)) {
278
279 // Function definitions are only allowed at file scope and in C++ classes.
280 // The C++ inline method definition case is handled elsewhere, so we only
281 // need to handle the file scope definition case.
282 if (Context != DeclaratorContext::FileContext) {
283 Diag(Tok, diag::err_function_definition_not_allowed);
284 SkipMalformedDecl();
285 return nullptr;
286 }
287
288 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
289 // Recover by ignoring the 'typedef'. This was probably supposed to be
290 // the 'typename' keyword, which we should have already suggested adding
291 // if it's appropriate.
292 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
293 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
294 DS.ClearStorageClassSpecs();
295 }
296
297 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
298 if (DeclaratorInfo.getName().getKind() !=
299 UnqualifiedIdKind::IK_TemplateId) {
300 // If the declarator-id is not a template-id, issue a diagnostic and
301 // recover by ignoring the 'template' keyword.
302 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
303 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
304 &LateParsedAttrs);
305 } else {
306 SourceLocation LAngleLoc
307 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
308 Diag(DeclaratorInfo.getIdentifierLoc(),
309 diag::err_explicit_instantiation_with_definition)
310 << SourceRange(TemplateInfo.TemplateLoc)
311 << FixItHint::CreateInsertion(LAngleLoc, "<>");
312
313 // Recover as if it were an explicit specialization.
314 TemplateParameterLists FakedParamLists;
315 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
316 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
317 LAngleLoc, nullptr));
318
319 return ParseFunctionDefinition(
320 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
321 /*isSpecialization=*/true,
322 /*lastParameterListWasEmpty=*/true),
323 &LateParsedAttrs);
324 }
325 }
326 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
327 &LateParsedAttrs);
328 }
329
330 // Parse this declaration.
331 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
332 TemplateInfo);
333
334 if (Tok.is(tok::comma)) {
335 Diag(Tok, diag::err_multiple_template_declarators)
336 << (int)TemplateInfo.Kind;
337 SkipUntil(tok::semi);
338 return ThisDecl;
339 }
340
341 // Eat the semi colon after the declaration.
342 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
343 if (LateParsedAttrs.size() > 0)
344 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
345 DeclaratorInfo.complete(ThisDecl);
346 return ThisDecl;
347}
348
349/// \brief Parse a single declaration that declares a concept.
350///
351/// \param DeclEnd will receive the source location of the last token
352/// within this declaration.
353///
354/// \returns the new declaration.
355Decl *
356Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
357 SourceLocation &DeclEnd) {
358 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&((TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
"Template information required") ? static_cast<void> (
0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 359, __PRETTY_FUNCTION__))
359 "Template information required")((TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
"Template information required") ? static_cast<void> (
0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 359, __PRETTY_FUNCTION__))
;
360 assert(Tok.is(tok::kw_concept) &&((Tok.is(tok::kw_concept) && "ParseConceptDefinition must be called when at a 'concept' keyword"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::kw_concept) && \"ParseConceptDefinition must be called when at a 'concept' keyword\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 361, __PRETTY_FUNCTION__))
361 "ParseConceptDefinition must be called when at a 'concept' keyword")((Tok.is(tok::kw_concept) && "ParseConceptDefinition must be called when at a 'concept' keyword"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::kw_concept) && \"ParseConceptDefinition must be called when at a 'concept' keyword\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 361, __PRETTY_FUNCTION__))
;
362
363 ConsumeToken(); // Consume 'concept'
364
365 SourceLocation BoolKWLoc;
366 if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
367 Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
368 FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
369
370 DiagnoseAndSkipCXX11Attributes();
371
372 CXXScopeSpec SS;
373 if (ParseOptionalCXXScopeSpecifier(
374 SS, /*ObjectType=*/nullptr,
375 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
376 /*MayBePseudoDestructor=*/nullptr,
377 /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
378 SS.isInvalid()) {
379 SkipUntil(tok::semi);
380 return nullptr;
381 }
382
383 if (SS.isNotEmpty())
384 Diag(SS.getBeginLoc(),
385 diag::err_concept_definition_not_identifier);
386
387 UnqualifiedId Result;
388 if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
389 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
390 /*AllowDestructorName=*/false,
391 /*AllowConstructorName=*/false,
392 /*AllowDeductionGuide=*/false,
393 /*TemplateKWLoc=*/nullptr, Result)) {
394 SkipUntil(tok::semi);
395 return nullptr;
396 }
397
398 if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
399 Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
400 SkipUntil(tok::semi);
401 return nullptr;
402 }
403
404 IdentifierInfo *Id = Result.Identifier;
405 SourceLocation IdLoc = Result.getBeginLoc();
406
407 DiagnoseAndSkipCXX11Attributes();
408
409 if (!TryConsumeToken(tok::equal)) {
410 Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
411 SkipUntil(tok::semi);
412 return nullptr;
413 }
414
415 ExprResult ConstraintExprResult =
416 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
417 if (ConstraintExprResult.isInvalid()) {
418 SkipUntil(tok::semi);
419 return nullptr;
420 }
421
422 DeclEnd = Tok.getLocation();
423 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
424 Expr *ConstraintExpr = ConstraintExprResult.get();
425 return Actions.ActOnConceptDefinition(getCurScope(),
426 *TemplateInfo.TemplateParams,
427 Id, IdLoc, ConstraintExpr);
428}
429
430/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
431/// angle brackets. Depth is the depth of this template-parameter-list, which
432/// is the number of template headers directly enclosing this template header.
433/// TemplateParams is the current list of template parameters we're building.
434/// The template parameter we parse will be added to this list. LAngleLoc and
435/// RAngleLoc will receive the positions of the '<' and '>', respectively,
436/// that enclose this template parameter list.
437///
438/// \returns true if an error occurred, false otherwise.
439bool Parser::ParseTemplateParameters(
440 MultiParseScope &TemplateScopes, unsigned Depth,
441 SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
442 SourceLocation &RAngleLoc) {
443 // Get the template parameter list.
444 if (!TryConsumeToken(tok::less, LAngleLoc)) {
445 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
446 return true;
447 }
448
449 // Try to parse the template parameter list.
450 bool Failed = false;
451 // FIXME: Missing greatergreatergreater support.
452 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
453 TemplateScopes.Enter(Scope::TemplateParamScope);
454 Failed = ParseTemplateParameterList(Depth, TemplateParams);
455 }
456
457 if (Tok.is(tok::greatergreater)) {
458 // No diagnostic required here: a template-parameter-list can only be
459 // followed by a declaration or, for a template template parameter, the
460 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
461 // This matters for elegant diagnosis of:
462 // template<template<typename>> struct S;
463 Tok.setKind(tok::greater);
464 RAngleLoc = Tok.getLocation();
465 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
466 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
467 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
468 return true;
469 }
470 return false;
471}
472
473/// ParseTemplateParameterList - Parse a template parameter list. If
474/// the parsing fails badly (i.e., closing bracket was left out), this
475/// will try to put the token stream in a reasonable position (closing
476/// a statement, etc.) and return false.
477///
478/// template-parameter-list: [C++ temp]
479/// template-parameter
480/// template-parameter-list ',' template-parameter
481bool
482Parser::ParseTemplateParameterList(const unsigned Depth,
483 SmallVectorImpl<NamedDecl*> &TemplateParams) {
484 while (1) {
485
486 if (NamedDecl *TmpParam
487 = ParseTemplateParameter(Depth, TemplateParams.size())) {
488 TemplateParams.push_back(TmpParam);
489 } else {
490 // If we failed to parse a template parameter, skip until we find
491 // a comma or closing brace.
492 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
493 StopAtSemi | StopBeforeMatch);
494 }
495
496 // Did we find a comma or the end of the template parameter list?
497 if (Tok.is(tok::comma)) {
498 ConsumeToken();
499 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
500 // Don't consume this... that's done by template parser.
501 break;
502 } else {
503 // Somebody probably forgot to close the template. Skip ahead and
504 // try to get out of the expression. This error is currently
505 // subsumed by whatever goes on in ParseTemplateParameter.
506 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
507 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
508 StopAtSemi | StopBeforeMatch);
509 return false;
510 }
511 }
512 return true;
513}
514
515/// Determine whether the parser is at the start of a template
516/// type parameter.
517Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
518 if (Tok.is(tok::kw_class)) {
519 // "class" may be the start of an elaborated-type-specifier or a
520 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
521 switch (NextToken().getKind()) {
522 case tok::equal:
523 case tok::comma:
524 case tok::greater:
525 case tok::greatergreater:
526 case tok::ellipsis:
527 return TPResult::True;
528
529 case tok::identifier:
530 // This may be either a type-parameter or an elaborated-type-specifier.
531 // We have to look further.
532 break;
533
534 default:
535 return TPResult::False;
536 }
537
538 switch (GetLookAheadToken(2).getKind()) {
539 case tok::equal:
540 case tok::comma:
541 case tok::greater:
542 case tok::greatergreater:
543 return TPResult::True;
544
545 default:
546 return TPResult::False;
547 }
548 }
549
550 if (TryAnnotateTypeConstraint())
551 return TPResult::Error;
552
553 if (isTypeConstraintAnnotation() &&
554 // Next token might be 'auto' or 'decltype', indicating that this
555 // type-constraint is in fact part of a placeholder-type-specifier of a
556 // non-type template parameter.
557 !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
558 .isOneOf(tok::kw_auto, tok::kw_decltype))
559 return TPResult::True;
560
561 // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
562 // ill-formed otherwise.
563 if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
564 return TPResult::False;
565
566 // C++ [temp.param]p2:
567 // There is no semantic difference between class and typename in a
568 // template-parameter. typename followed by an unqualified-id
569 // names a template type parameter. typename followed by a
570 // qualified-id denotes the type in a non-type
571 // parameter-declaration.
572 Token Next = NextToken();
573
574 // If we have an identifier, skip over it.
575 if (Next.getKind() == tok::identifier)
576 Next = GetLookAheadToken(2);
577
578 switch (Next.getKind()) {
579 case tok::equal:
580 case tok::comma:
581 case tok::greater:
582 case tok::greatergreater:
583 case tok::ellipsis:
584 return TPResult::True;
585
586 case tok::kw_typename:
587 case tok::kw_typedef:
588 case tok::kw_class:
589 // These indicate that a comma was missed after a type parameter, not that
590 // we have found a non-type parameter.
591 return TPResult::True;
592
593 default:
594 return TPResult::False;
595 }
596}
597
598/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
599///
600/// template-parameter: [C++ temp.param]
601/// type-parameter
602/// parameter-declaration
603///
604/// type-parameter: (See below)
605/// type-parameter-key ...[opt] identifier[opt]
606/// type-parameter-key identifier[opt] = type-id
607/// (C++2a) type-constraint ...[opt] identifier[opt]
608/// (C++2a) type-constraint identifier[opt] = type-id
609/// 'template' '<' template-parameter-list '>' type-parameter-key
610/// ...[opt] identifier[opt]
611/// 'template' '<' template-parameter-list '>' type-parameter-key
612/// identifier[opt] '=' id-expression
613///
614/// type-parameter-key:
615/// class
616/// typename
617///
618NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
619
620 switch (isStartOfTemplateTypeParameter()) {
621 case TPResult::True:
622 // Is there just a typo in the input code? ('typedef' instead of
623 // 'typename')
624 if (Tok.is(tok::kw_typedef)) {
625 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
626
627 Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
628 << FixItHint::CreateReplacement(CharSourceRange::getCharRange(
629 Tok.getLocation(),
630 Tok.getEndLoc()),
631 "typename");
632
633 Tok.setKind(tok::kw_typename);
634 }
635
636 return ParseTypeParameter(Depth, Position);
637 case TPResult::False:
638 break;
639
640 case TPResult::Error: {
641 // We return an invalid parameter as opposed to null to avoid having bogus
642 // diagnostics about an empty template parameter list.
643 // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
644 // from here.
645 // Return a NTTP as if there was an error in a scope specifier, the user
646 // probably meant to write the type of a NTTP.
647 DeclSpec DS(getAttrFactory());
648 DS.SetTypeSpecError();
649 Declarator D(DS, DeclaratorContext::TemplateParamContext);
650 D.SetIdentifier(nullptr, Tok.getLocation());
651 D.setInvalidType(true);
652 NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
653 getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
654 /*DefaultArg=*/nullptr);
655 ErrorParam->setInvalidDecl(true);
656 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
657 StopAtSemi | StopBeforeMatch);
658 return ErrorParam;
659 }
660
661 case TPResult::Ambiguous:
662 llvm_unreachable("template param classification can't be ambiguous")::llvm::llvm_unreachable_internal("template param classification can't be ambiguous"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 662)
;
663 }
664
665 if (Tok.is(tok::kw_template))
666 return ParseTemplateTemplateParameter(Depth, Position);
667
668 // If it's none of the above, then it must be a parameter declaration.
669 // NOTE: This will pick up errors in the closure of the template parameter
670 // list (e.g., template < ; Check here to implement >> style closures.
671 return ParseNonTypeTemplateParameter(Depth, Position);
672}
673
674/// Check whether the current token is a template-id annotation denoting a
675/// type-constraint.
676bool Parser::isTypeConstraintAnnotation() {
677 const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
678 if (T.isNot(tok::annot_template_id))
679 return false;
680 const auto *ExistingAnnot =
681 static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
682 return ExistingAnnot->Kind == TNK_Concept_template;
683}
684
685/// Try parsing a type-constraint at the current location.
686///
687/// type-constraint:
688/// nested-name-specifier[opt] concept-name
689/// nested-name-specifier[opt] concept-name
690/// '<' template-argument-list[opt] '>'[opt]
691///
692/// \returns true if an error occurred, and false otherwise.
693bool Parser::TryAnnotateTypeConstraint() {
694 if (!getLangOpts().CPlusPlus20)
695 return false;
696 CXXScopeSpec SS;
697 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
698 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
699 /*ObjectHadErrors=*/false,
700 /*EnteringContext=*/false,
701 /*MayBePseudoDestructor=*/nullptr,
702 // If this is not a type-constraint, then
703 // this scope-spec is part of the typename
704 // of a non-type template parameter
705 /*IsTypename=*/true, /*LastII=*/nullptr,
706 // We won't find concepts in
707 // non-namespaces anyway, so might as well
708 // parse this correctly for possible type
709 // names.
710 /*OnlyNamespace=*/false))
711 return true;
712
713 if (Tok.is(tok::identifier)) {
714 UnqualifiedId PossibleConceptName;
715 PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
716 Tok.getLocation());
717
718 TemplateTy PossibleConcept;
719 bool MemberOfUnknownSpecialization = false;
720 auto TNK = Actions.isTemplateName(getCurScope(), SS,
721 /*hasTemplateKeyword=*/false,
722 PossibleConceptName,
723 /*ObjectType=*/ParsedType(),
724 /*EnteringContext=*/false,
725 PossibleConcept,
726 MemberOfUnknownSpecialization,
727 /*Disambiguation=*/true);
728 if (MemberOfUnknownSpecialization || !PossibleConcept ||
729 TNK != TNK_Concept_template) {
730 if (SS.isNotEmpty())
731 AnnotateScopeToken(SS, !WasScopeAnnotation);
732 return false;
733 }
734
735 // At this point we're sure we're dealing with a constrained parameter. It
736 // may or may not have a template parameter list following the concept
737 // name.
738 if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
739 /*TemplateKWLoc=*/SourceLocation(),
740 PossibleConceptName,
741 /*AllowTypeAnnotation=*/false,
742 /*TypeConstraint=*/true))
743 return true;
744 }
745
746 if (SS.isNotEmpty())
747 AnnotateScopeToken(SS, !WasScopeAnnotation);
748 return false;
749}
750
751/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
752/// Other kinds of template parameters are parsed in
753/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
754///
755/// type-parameter: [C++ temp.param]
756/// 'class' ...[opt][C++0x] identifier[opt]
757/// 'class' identifier[opt] '=' type-id
758/// 'typename' ...[opt][C++0x] identifier[opt]
759/// 'typename' identifier[opt] '=' type-id
760NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
761 assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||(((Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation
()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? static_cast<void> (0) : __assert_fail
("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 764, __PRETTY_FUNCTION__))
762 isTypeConstraintAnnotation()) &&(((Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation
()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? static_cast<void> (0) : __assert_fail
("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 764, __PRETTY_FUNCTION__))
763 "A type-parameter starts with 'class', 'typename' or a "(((Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation
()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? static_cast<void> (0) : __assert_fail
("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 764, __PRETTY_FUNCTION__))
764 "type-constraint")(((Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation
()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? static_cast<void> (0) : __assert_fail
("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 764, __PRETTY_FUNCTION__))
;
765
766 CXXScopeSpec TypeConstraintSS;
767 TemplateIdAnnotation *TypeConstraint = nullptr;
768 bool TypenameKeyword = false;
769 SourceLocation KeyLoc;
770 ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
771 /*ObjectHadErrors=*/false,
772 /*EnteringContext*/ false);
773 if (Tok.is(tok::annot_template_id)) {
774 // Consume the 'type-constraint'.
775 TypeConstraint =
776 static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
777 assert(TypeConstraint->Kind == TNK_Concept_template &&((TypeConstraint->Kind == TNK_Concept_template && "stray non-concept template-id annotation"
) ? static_cast<void> (0) : __assert_fail ("TypeConstraint->Kind == TNK_Concept_template && \"stray non-concept template-id annotation\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 778, __PRETTY_FUNCTION__))
778 "stray non-concept template-id annotation")((TypeConstraint->Kind == TNK_Concept_template && "stray non-concept template-id annotation"
) ? static_cast<void> (0) : __assert_fail ("TypeConstraint->Kind == TNK_Concept_template && \"stray non-concept template-id annotation\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 778, __PRETTY_FUNCTION__))
;
779 KeyLoc = ConsumeAnnotationToken();
780 } else {
781 assert(TypeConstraintSS.isEmpty() &&((TypeConstraintSS.isEmpty() && "expected type constraint after scope specifier"
) ? static_cast<void> (0) : __assert_fail ("TypeConstraintSS.isEmpty() && \"expected type constraint after scope specifier\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 782, __PRETTY_FUNCTION__))
782 "expected type constraint after scope specifier")((TypeConstraintSS.isEmpty() && "expected type constraint after scope specifier"
) ? static_cast<void> (0) : __assert_fail ("TypeConstraintSS.isEmpty() && \"expected type constraint after scope specifier\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 782, __PRETTY_FUNCTION__))
;
783
784 // Consume the 'class' or 'typename' keyword.
785 TypenameKeyword = Tok.is(tok::kw_typename);
786 KeyLoc = ConsumeToken();
787 }
788
789 // Grab the ellipsis (if given).
790 SourceLocation EllipsisLoc;
791 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
792 Diag(EllipsisLoc,
793 getLangOpts().CPlusPlus11
794 ? diag::warn_cxx98_compat_variadic_templates
795 : diag::ext_variadic_templates);
796 }
797
798 // Grab the template parameter name (if given)
799 SourceLocation NameLoc = Tok.getLocation();
800 IdentifierInfo *ParamName = nullptr;
801 if (Tok.is(tok::identifier)) {
802 ParamName = Tok.getIdentifierInfo();
803 ConsumeToken();
804 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
805 tok::greatergreater)) {
806 // Unnamed template parameter. Don't have to do anything here, just
807 // don't consume this token.
808 } else {
809 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
810 return nullptr;
811 }
812
813 // Recover from misplaced ellipsis.
814 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
815 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
816 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
817
818 // Grab a default argument (if available).
819 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
820 // we introduce the type parameter into the local scope.
821 SourceLocation EqualLoc;
822 ParsedType DefaultArg;
823 if (TryConsumeToken(tok::equal, EqualLoc))
824 DefaultArg = ParseTypeName(/*Range=*/nullptr,
825 DeclaratorContext::TemplateTypeArgContext)
826 .get();
827
828 NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
829 TypenameKeyword, EllipsisLoc,
830 KeyLoc, ParamName, NameLoc,
831 Depth, Position, EqualLoc,
832 DefaultArg,
833 TypeConstraint != nullptr);
834
835 if (TypeConstraint) {
836 Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
837 cast<TemplateTypeParmDecl>(NewDecl),
838 EllipsisLoc);
839 }
840
841 return NewDecl;
842}
843
844/// ParseTemplateTemplateParameter - Handle the parsing of template
845/// template parameters.
846///
847/// type-parameter: [C++ temp.param]
848/// 'template' '<' template-parameter-list '>' type-parameter-key
849/// ...[opt] identifier[opt]
850/// 'template' '<' template-parameter-list '>' type-parameter-key
851/// identifier[opt] = id-expression
852/// type-parameter-key:
853/// 'class'
854/// 'typename' [C++1z]
855NamedDecl *
856Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
857 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword")((Tok.is(tok::kw_template) && "Expected 'template' keyword"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::kw_template) && \"Expected 'template' keyword\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 857, __PRETTY_FUNCTION__))
;
858
859 // Handle the template <...> part.
860 SourceLocation TemplateLoc = ConsumeToken();
861 SmallVector<NamedDecl*,8> TemplateParams;
862 SourceLocation LAngleLoc, RAngleLoc;
863 {
864 MultiParseScope TemplateParmScope(*this);
865 if (ParseTemplateParameters(TemplateParmScope, Depth + 1, TemplateParams,
866 LAngleLoc, RAngleLoc)) {
867 return nullptr;
868 }
869 }
870
871 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
872 // Generate a meaningful error if the user forgot to put class before the
873 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
874 // or greater appear immediately or after 'struct'. In the latter case,
875 // replace the keyword with 'class'.
876 if (!TryConsumeToken(tok::kw_class)) {
877 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
878 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
879 if (Tok.is(tok::kw_typename)) {
880 Diag(Tok.getLocation(),
881 getLangOpts().CPlusPlus17
882 ? diag::warn_cxx14_compat_template_template_param_typename
883 : diag::ext_template_template_param_typename)
884 << (!getLangOpts().CPlusPlus17
885 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
886 : FixItHint());
887 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
888 tok::greatergreater, tok::ellipsis)) {
889 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
890 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
891 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
892 } else
893 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
894
895 if (Replace)
896 ConsumeToken();
897 }
898
899 // Parse the ellipsis, if given.
900 SourceLocation EllipsisLoc;
901 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
902 Diag(EllipsisLoc,
903 getLangOpts().CPlusPlus11
904 ? diag::warn_cxx98_compat_variadic_templates
905 : diag::ext_variadic_templates);
906
907 // Get the identifier, if given.
908 SourceLocation NameLoc = Tok.getLocation();
909 IdentifierInfo *ParamName = nullptr;
910 if (Tok.is(tok::identifier)) {
911 ParamName = Tok.getIdentifierInfo();
912 ConsumeToken();
913 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
914 tok::greatergreater)) {
915 // Unnamed template parameter. Don't have to do anything here, just
916 // don't consume this token.
917 } else {
918 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
919 return nullptr;
920 }
921
922 // Recover from misplaced ellipsis.
923 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
924 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
925 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
926
927 TemplateParameterList *ParamList =
928 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
929 TemplateLoc, LAngleLoc,
930 TemplateParams,
931 RAngleLoc, nullptr);
932
933 // Grab a default argument (if available).
934 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
935 // we introduce the template parameter into the local scope.
936 SourceLocation EqualLoc;
937 ParsedTemplateArgument DefaultArg;
938 if (TryConsumeToken(tok::equal, EqualLoc)) {
939 DefaultArg = ParseTemplateTemplateArgument();
940 if (DefaultArg.isInvalid()) {
941 Diag(Tok.getLocation(),
942 diag::err_default_template_template_parameter_not_template);
943 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
944 StopAtSemi | StopBeforeMatch);
945 }
946 }
947
948 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
949 ParamList, EllipsisLoc,
950 ParamName, NameLoc, Depth,
951 Position, EqualLoc, DefaultArg);
952}
953
954/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
955/// template parameters (e.g., in "template<int Size> class array;").
956///
957/// template-parameter:
958/// ...
959/// parameter-declaration
960NamedDecl *
961Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
962 // Parse the declaration-specifiers (i.e., the type).
963 // FIXME: The type should probably be restricted in some way... Not all
964 // declarators (parts of declarators?) are accepted for parameters.
965 DeclSpec DS(AttrFactory);
966 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
967 DeclSpecContext::DSC_template_param);
968
969 // Parse this as a typename.
970 Declarator ParamDecl(DS, DeclaratorContext::TemplateParamContext);
971 ParseDeclarator(ParamDecl);
972 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
973 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
974 return nullptr;
975 }
976
977 // Recover from misplaced ellipsis.
978 SourceLocation EllipsisLoc;
979 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
980 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
981
982 // If there is a default value, parse it.
983 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
984 // we introduce the template parameter into the local scope.
985 SourceLocation EqualLoc;
986 ExprResult DefaultArg;
987 if (TryConsumeToken(tok::equal, EqualLoc)) {
988 // C++ [temp.param]p15:
989 // When parsing a default template-argument for a non-type
990 // template-parameter, the first non-nested > is taken as the
991 // end of the template-parameter-list rather than a greater-than
992 // operator.
993 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
994 EnterExpressionEvaluationContext ConstantEvaluated(
995 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
996
997 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
998 if (DefaultArg.isInvalid())
999 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1000 }
1001
1002 // Create the parameter.
1003 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
1004 Depth, Position, EqualLoc,
1005 DefaultArg.get());
1006}
1007
1008void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
1009 SourceLocation CorrectLoc,
1010 bool AlreadyHasEllipsis,
1011 bool IdentifierHasName) {
1012 FixItHint Insertion;
1013 if (!AlreadyHasEllipsis)
1014 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
1015 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
1016 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
1017 << !IdentifierHasName;
1018}
1019
1020void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
1021 Declarator &D) {
1022 assert(EllipsisLoc.isValid())((EllipsisLoc.isValid()) ? static_cast<void> (0) : __assert_fail
("EllipsisLoc.isValid()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1022, __PRETTY_FUNCTION__))
;
1023 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
1024 if (!AlreadyHasEllipsis)
1025 D.setEllipsisLoc(EllipsisLoc);
1026 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
1027 AlreadyHasEllipsis, D.hasName());
1028}
1029
1030/// Parses a '>' at the end of a template list.
1031///
1032/// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
1033/// to determine if these tokens were supposed to be a '>' followed by
1034/// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
1035///
1036/// \param RAngleLoc the location of the consumed '>'.
1037///
1038/// \param ConsumeLastToken if true, the '>' is consumed.
1039///
1040/// \param ObjCGenericList if true, this is the '>' closing an Objective-C
1041/// type parameter or type argument list, rather than a C++ template parameter
1042/// or argument list.
1043///
1044/// \returns true, if current token does not start with '>', false otherwise.
1045bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
1046 SourceLocation &RAngleLoc,
1047 bool ConsumeLastToken,
1048 bool ObjCGenericList) {
1049 // What will be left once we've consumed the '>'.
1050 tok::TokenKind RemainingToken;
1051 const char *ReplacementStr = "> >";
1052 bool MergeWithNextToken = false;
1053
1054 switch (Tok.getKind()) {
1055 default:
1056 Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
1057 Diag(LAngleLoc, diag::note_matching) << tok::less;
1058 return true;
1059
1060 case tok::greater:
1061 // Determine the location of the '>' token. Only consume this token
1062 // if the caller asked us to.
1063 RAngleLoc = Tok.getLocation();
1064 if (ConsumeLastToken)
1065 ConsumeToken();
1066 return false;
1067
1068 case tok::greatergreater:
1069 RemainingToken = tok::greater;
1070 break;
1071
1072 case tok::greatergreatergreater:
1073 RemainingToken = tok::greatergreater;
1074 break;
1075
1076 case tok::greaterequal:
1077 RemainingToken = tok::equal;
1078 ReplacementStr = "> =";
1079
1080 // Join two adjacent '=' tokens into one, for cases like:
1081 // void (*p)() = f<int>;
1082 // return f<int>==p;
1083 if (NextToken().is(tok::equal) &&
1084 areTokensAdjacent(Tok, NextToken())) {
1085 RemainingToken = tok::equalequal;
1086 MergeWithNextToken = true;
1087 }
1088 break;
1089
1090 case tok::greatergreaterequal:
1091 RemainingToken = tok::greaterequal;
1092 break;
1093 }
1094
1095 // This template-id is terminated by a token that starts with a '>'.
1096 // Outside C++11 and Objective-C, this is now error recovery.
1097 //
1098 // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
1099 // extend that treatment to also apply to the '>>>' token.
1100 //
1101 // Objective-C allows this in its type parameter / argument lists.
1102
1103 SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
1104 SourceLocation TokLoc = Tok.getLocation();
1105 Token Next = NextToken();
1106
1107 // Whether splitting the current token after the '>' would undesirably result
1108 // in the remaining token pasting with the token after it. This excludes the
1109 // MergeWithNextToken cases, which we've already handled.
1110 bool PreventMergeWithNextToken =
1111 (RemainingToken == tok::greater ||
1112 RemainingToken == tok::greatergreater) &&
1113 (Next.isOneOf(tok::greater, tok::greatergreater,
1114 tok::greatergreatergreater, tok::equal, tok::greaterequal,
1115 tok::greatergreaterequal, tok::equalequal)) &&
1116 areTokensAdjacent(Tok, Next);
1117
1118 // Diagnose this situation as appropriate.
1119 if (!ObjCGenericList) {
1120 // The source range of the replaced token(s).
1121 CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
1122 TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
1123 getLangOpts()));
1124
1125 // A hint to put a space between the '>>'s. In order to make the hint as
1126 // clear as possible, we include the characters either side of the space in
1127 // the replacement, rather than just inserting a space at SecondCharLoc.
1128 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
1129 ReplacementStr);
1130
1131 // A hint to put another space after the token, if it would otherwise be
1132 // lexed differently.
1133 FixItHint Hint2;
1134 if (PreventMergeWithNextToken)
1135 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
1136
1137 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
1138 if (getLangOpts().CPlusPlus11 &&
1139 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
1140 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
1141 else if (Tok.is(tok::greaterequal))
1142 DiagId = diag::err_right_angle_bracket_equal_needs_space;
1143 Diag(TokLoc, DiagId) << Hint1 << Hint2;
1144 }
1145
1146 // Find the "length" of the resulting '>' token. This is not always 1, as it
1147 // can contain escaped newlines.
1148 unsigned GreaterLength = Lexer::getTokenPrefixLength(
1149 TokLoc, 1, PP.getSourceManager(), getLangOpts());
1150
1151 // Annotate the source buffer to indicate that we split the token after the
1152 // '>'. This allows us to properly find the end of, and extract the spelling
1153 // of, the '>' token later.
1154 RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
1155
1156 // Strip the initial '>' from the token.
1157 bool CachingTokens = PP.IsPreviousCachedToken(Tok);
1158
1159 Token Greater = Tok;
1160 Greater.setLocation(RAngleLoc);
1161 Greater.setKind(tok::greater);
1162 Greater.setLength(GreaterLength);
1163
1164 unsigned OldLength = Tok.getLength();
1165 if (MergeWithNextToken) {
1166 ConsumeToken();
1167 OldLength += Tok.getLength();
1168 }
1169
1170 Tok.setKind(RemainingToken);
1171 Tok.setLength(OldLength - GreaterLength);
1172
1173 // Split the second token if lexing it normally would lex a different token
1174 // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
1175 SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
1176 if (PreventMergeWithNextToken)
1177 AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
1178 Tok.setLocation(AfterGreaterLoc);
1179
1180 // Update the token cache to match what we just did if necessary.
1181 if (CachingTokens) {
1182 // If the previous cached token is being merged, delete it.
1183 if (MergeWithNextToken)
1184 PP.ReplacePreviousCachedToken({});
1185
1186 if (ConsumeLastToken)
1187 PP.ReplacePreviousCachedToken({Greater, Tok});
1188 else
1189 PP.ReplacePreviousCachedToken({Greater});
1190 }
1191
1192 if (ConsumeLastToken) {
1193 PrevTokLocation = RAngleLoc;
1194 } else {
1195 PrevTokLocation = TokBeforeGreaterLoc;
1196 PP.EnterToken(Tok, /*IsReinject=*/true);
1197 Tok = Greater;
1198 }
1199
1200 return false;
1201}
1202
1203
1204/// Parses a template-id that after the template name has
1205/// already been parsed.
1206///
1207/// This routine takes care of parsing the enclosed template argument
1208/// list ('<' template-parameter-list [opt] '>') and placing the
1209/// results into a form that can be transferred to semantic analysis.
1210///
1211/// \param ConsumeLastToken if true, then we will consume the last
1212/// token that forms the template-id. Otherwise, we will leave the
1213/// last token in the stream (e.g., so that it can be replaced with an
1214/// annotation token).
1215bool
1216Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
1217 SourceLocation &LAngleLoc,
1218 TemplateArgList &TemplateArgs,
1219 SourceLocation &RAngleLoc) {
1220 assert(Tok.is(tok::less) && "Must have already parsed the template-name")((Tok.is(tok::less) && "Must have already parsed the template-name"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::less) && \"Must have already parsed the template-name\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1220, __PRETTY_FUNCTION__))
;
1221
1222 // Consume the '<'.
1223 LAngleLoc = ConsumeToken();
1224
1225 // Parse the optional template-argument-list.
1226 bool Invalid = false;
1227 {
1228 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
1229 if (!Tok.isOneOf(tok::greater, tok::greatergreater,
1230 tok::greatergreatergreater, tok::greaterequal,
1231 tok::greatergreaterequal))
1232 Invalid = ParseTemplateArgumentList(TemplateArgs);
1233
1234 if (Invalid) {
1235 // Try to find the closing '>'.
1236 if (getLangOpts().CPlusPlus11)
1237 SkipUntil(tok::greater, tok::greatergreater,
1238 tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
1239 else
1240 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
1241 }
1242 }
1243
1244 return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
1245 /*ObjCGenericList=*/false) ||
1246 Invalid;
1247}
1248
1249/// Replace the tokens that form a simple-template-id with an
1250/// annotation token containing the complete template-id.
1251///
1252/// The first token in the stream must be the name of a template that
1253/// is followed by a '<'. This routine will parse the complete
1254/// simple-template-id and replace the tokens with a single annotation
1255/// token with one of two different kinds: if the template-id names a
1256/// type (and \p AllowTypeAnnotation is true), the annotation token is
1257/// a type annotation that includes the optional nested-name-specifier
1258/// (\p SS). Otherwise, the annotation token is a template-id
1259/// annotation that does not include the optional
1260/// nested-name-specifier.
1261///
1262/// \param Template the declaration of the template named by the first
1263/// token (an identifier), as returned from \c Action::isTemplateName().
1264///
1265/// \param TNK the kind of template that \p Template
1266/// refers to, as returned from \c Action::isTemplateName().
1267///
1268/// \param SS if non-NULL, the nested-name-specifier that precedes
1269/// this template name.
1270///
1271/// \param TemplateKWLoc if valid, specifies that this template-id
1272/// annotation was preceded by the 'template' keyword and gives the
1273/// location of that keyword. If invalid (the default), then this
1274/// template-id was not preceded by a 'template' keyword.
1275///
1276/// \param AllowTypeAnnotation if true (the default), then a
1277/// simple-template-id that refers to a class template, template
1278/// template parameter, or other template that produces a type will be
1279/// replaced with a type annotation token. Otherwise, the
1280/// simple-template-id is always replaced with a template-id
1281/// annotation token.
1282///
1283/// \param TypeConstraint if true, then this is actually a type-constraint,
1284/// meaning that the template argument list can be omitted (and the template in
1285/// question must be a concept).
1286///
1287/// If an unrecoverable parse error occurs and no annotation token can be
1288/// formed, this function returns true.
1289///
1290bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
1291 CXXScopeSpec &SS,
1292 SourceLocation TemplateKWLoc,
1293 UnqualifiedId &TemplateName,
1294 bool AllowTypeAnnotation,
1295 bool TypeConstraint) {
1296 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++")((getLangOpts().CPlusPlus && "Can only annotate template-ids in C++"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Can only annotate template-ids in C++\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1296, __PRETTY_FUNCTION__))
;
1297 assert((Tok.is(tok::less) || TypeConstraint) &&(((Tok.is(tok::less) || TypeConstraint) && "Parser isn't at the beginning of a template-id"
) ? static_cast<void> (0) : __assert_fail ("(Tok.is(tok::less) || TypeConstraint) && \"Parser isn't at the beginning of a template-id\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1298, __PRETTY_FUNCTION__))
1298 "Parser isn't at the beginning of a template-id")(((Tok.is(tok::less) || TypeConstraint) && "Parser isn't at the beginning of a template-id"
) ? static_cast<void> (0) : __assert_fail ("(Tok.is(tok::less) || TypeConstraint) && \"Parser isn't at the beginning of a template-id\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1298, __PRETTY_FUNCTION__))
;
1299 assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "((!(TypeConstraint && AllowTypeAnnotation) &&
"type-constraint can't be " "a type annotation") ? static_cast
<void> (0) : __assert_fail ("!(TypeConstraint && AllowTypeAnnotation) && \"type-constraint can't be \" \"a type annotation\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1300, __PRETTY_FUNCTION__))
1300 "a type annotation")((!(TypeConstraint && AllowTypeAnnotation) &&
"type-constraint can't be " "a type annotation") ? static_cast
<void> (0) : __assert_fail ("!(TypeConstraint && AllowTypeAnnotation) && \"type-constraint can't be \" \"a type annotation\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1300, __PRETTY_FUNCTION__))
;
1301 assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "(((!TypeConstraint || TNK == TNK_Concept_template) &&
"type-constraint " "must accompany a concept name") ? static_cast
<void> (0) : __assert_fail ("(!TypeConstraint || TNK == TNK_Concept_template) && \"type-constraint \" \"must accompany a concept name\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1302, __PRETTY_FUNCTION__))
1302 "must accompany a concept name")(((!TypeConstraint || TNK == TNK_Concept_template) &&
"type-constraint " "must accompany a concept name") ? static_cast
<void> (0) : __assert_fail ("(!TypeConstraint || TNK == TNK_Concept_template) && \"type-constraint \" \"must accompany a concept name\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1302, __PRETTY_FUNCTION__))
;
1303 assert((Template || TNK == TNK_Non_template) && "missing template name")(((Template || TNK == TNK_Non_template) && "missing template name"
) ? static_cast<void> (0) : __assert_fail ("(Template || TNK == TNK_Non_template) && \"missing template name\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1303, __PRETTY_FUNCTION__))
;
1304
1305 // Consume the template-name.
1306 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
1307
1308 // Parse the enclosed template argument list.
1309 SourceLocation LAngleLoc, RAngleLoc;
1310 TemplateArgList TemplateArgs;
1311 bool ArgsInvalid = false;
1312 if (!TypeConstraint || Tok.is(tok::less)) {
1313 ArgsInvalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
1314 TemplateArgs, RAngleLoc);
1315 // If we couldn't recover from invalid arguments, don't form an annotation
1316 // token -- we don't know how much to annotate.
1317 // FIXME: This can lead to duplicate diagnostics if we retry parsing this
1318 // template-id in another context. Try to annotate anyway?
1319 if (RAngleLoc.isInvalid())
1320 return true;
1321 }
1322
1323 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
1324
1325 // Build the annotation token.
1326 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
1327 TypeResult Type = ArgsInvalid
1328 ? TypeError()
1329 : Actions.ActOnTemplateIdType(
1330 getCurScope(), SS, TemplateKWLoc, Template,
1331 TemplateName.Identifier, TemplateNameLoc,
1332 LAngleLoc, TemplateArgsPtr, RAngleLoc);
1333
1334 Tok.setKind(tok::annot_typename);
1335 setTypeAnnotation(Tok, Type);
1336 if (SS.isNotEmpty())
1337 Tok.setLocation(SS.getBeginLoc());
1338 else if (TemplateKWLoc.isValid())
1339 Tok.setLocation(TemplateKWLoc);
1340 else
1341 Tok.setLocation(TemplateNameLoc);
1342 } else {
1343 // Build a template-id annotation token that can be processed
1344 // later.
1345 Tok.setKind(tok::annot_template_id);
1346
1347 IdentifierInfo *TemplateII =
1348 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1349 ? TemplateName.Identifier
1350 : nullptr;
1351
1352 OverloadedOperatorKind OpKind =
1353 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1354 ? OO_None
1355 : TemplateName.OperatorFunctionId.Operator;
1356
1357 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
1358 TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1359 LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
1360
1361 Tok.setAnnotationValue(TemplateId);
1362 if (TemplateKWLoc.isValid())
1363 Tok.setLocation(TemplateKWLoc);
1364 else
1365 Tok.setLocation(TemplateNameLoc);
1366 }
1367
1368 // Common fields for the annotation token
1369 Tok.setAnnotationEndLoc(RAngleLoc);
1370
1371 // In case the tokens were cached, have Preprocessor replace them with the
1372 // annotation token.
1373 PP.AnnotateCachedTokens(Tok);
1374 return false;
1375}
1376
1377/// Replaces a template-id annotation token with a type
1378/// annotation token.
1379///
1380/// If there was a failure when forming the type from the template-id,
1381/// a type annotation token will still be created, but will have a
1382/// NULL type pointer to signify an error.
1383///
1384/// \param SS The scope specifier appearing before the template-id, if any.
1385///
1386/// \param IsClassName Is this template-id appearing in a context where we
1387/// know it names a class, such as in an elaborated-type-specifier or
1388/// base-specifier? ('typename' and 'template' are unneeded and disallowed
1389/// in those contexts.)
1390void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
1391 bool IsClassName) {
1392 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens")((Tok.is(tok::annot_template_id) && "Requires template-id tokens"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::annot_template_id) && \"Requires template-id tokens\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1392, __PRETTY_FUNCTION__))
;
1393
1394 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1395 assert(TemplateId->mightBeType() &&((TemplateId->mightBeType() && "Only works for type and dependent templates"
) ? static_cast<void> (0) : __assert_fail ("TemplateId->mightBeType() && \"Only works for type and dependent templates\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1396, __PRETTY_FUNCTION__))
1396 "Only works for type and dependent templates")((TemplateId->mightBeType() && "Only works for type and dependent templates"
) ? static_cast<void> (0) : __assert_fail ("TemplateId->mightBeType() && \"Only works for type and dependent templates\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1396, __PRETTY_FUNCTION__))
;
1397
1398 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1399 TemplateId->NumArgs);
1400
1401 TypeResult Type =
1402 TemplateId->isInvalid()
1403 ? TypeError()
1404 : Actions.ActOnTemplateIdType(
1405 getCurScope(), SS, TemplateId->TemplateKWLoc,
1406 TemplateId->Template, TemplateId->Name,
1407 TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
1408 TemplateArgsPtr, TemplateId->RAngleLoc,
1409 /*IsCtorOrDtorName*/ false, IsClassName);
1410 // Create the new "type" annotation token.
1411 Tok.setKind(tok::annot_typename);
1412 setTypeAnnotation(Tok, Type);
1413 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1414 Tok.setLocation(SS.getBeginLoc());
1415 // End location stays the same
1416
1417 // Replace the template-id annotation token, and possible the scope-specifier
1418 // that precedes it, with the typename annotation token.
1419 PP.AnnotateCachedTokens(Tok);
1420}
1421
1422/// Determine whether the given token can end a template argument.
1423static bool isEndOfTemplateArgument(Token Tok) {
1424 // FIXME: Handle '>>>'.
1425 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
1426 tok::greatergreatergreater);
1427}
1428
1429/// Parse a C++ template template argument.
1430ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1431 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1432 !Tok.is(tok::annot_cxxscope))
1433 return ParsedTemplateArgument();
1434
1435 // C++0x [temp.arg.template]p1:
1436 // A template-argument for a template template-parameter shall be the name
1437 // of a class template or an alias template, expressed as id-expression.
1438 //
1439 // We parse an id-expression that refers to a class template or alias
1440 // template. The grammar we parse is:
1441 //
1442 // nested-name-specifier[opt] template[opt] identifier ...[opt]
1443 //
1444 // followed by a token that terminates a template argument, such as ',',
1445 // '>', or (in some cases) '>>'.
1446 CXXScopeSpec SS; // nested-name-specifier, if present
1447 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1448 /*ObjectHadErrors=*/false,
1449 /*EnteringContext=*/false);
1450
1451 ParsedTemplateArgument Result;
1452 SourceLocation EllipsisLoc;
1453 if (SS.isSet() && Tok.is(tok::kw_template)) {
1454 // Parse the optional 'template' keyword following the
1455 // nested-name-specifier.
1456 SourceLocation TemplateKWLoc = ConsumeToken();
1457
1458 if (Tok.is(tok::identifier)) {
1459 // We appear to have a dependent template name.
1460 UnqualifiedId Name;
1461 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1462 ConsumeToken(); // the identifier
1463
1464 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1465
1466 // If the next token signals the end of a template argument, then we have
1467 // a (possibly-dependent) template name that could be a template template
1468 // argument.
1469 TemplateTy Template;
1470 if (isEndOfTemplateArgument(Tok) &&
1471 Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
1472 /*ObjectType=*/nullptr,
1473 /*EnteringContext=*/false, Template))
1474 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1475 }
1476 } else if (Tok.is(tok::identifier)) {
1477 // We may have a (non-dependent) template name.
1478 TemplateTy Template;
1479 UnqualifiedId Name;
1480 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1481 ConsumeToken(); // the identifier
1482
1483 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1484
1485 if (isEndOfTemplateArgument(Tok)) {
1486 bool MemberOfUnknownSpecialization;
1487 TemplateNameKind TNK = Actions.isTemplateName(
1488 getCurScope(), SS,
1489 /*hasTemplateKeyword=*/false, Name,
1490 /*ObjectType=*/nullptr,
1491 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1492 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1493 // We have an id-expression that refers to a class template or
1494 // (C++0x) alias template.
1495 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1496 }
1497 }
1498 }
1499
1500 // If this is a pack expansion, build it as such.
1501 if (EllipsisLoc.isValid() && !Result.isInvalid())
1502 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1503
1504 return Result;
1505}
1506
1507/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1508///
1509/// template-argument: [C++ 14.2]
1510/// constant-expression
1511/// type-id
1512/// id-expression
1513ParsedTemplateArgument Parser::ParseTemplateArgument() {
1514 // C++ [temp.arg]p2:
1515 // In a template-argument, an ambiguity between a type-id and an
1516 // expression is resolved to a type-id, regardless of the form of
1517 // the corresponding template-parameter.
1518 //
1519 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1520 // up and annotate an identifier as an id-expression during disambiguation,
1521 // so enter the appropriate context for a constant expression template
1522 // argument before trying to disambiguate.
1523
1524 EnterExpressionEvaluationContext EnterConstantEvaluated(
1525 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
1526 /*LambdaContextDecl=*/nullptr,
1527 /*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
1528 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1529 TypeResult TypeArg = ParseTypeName(
1530 /*Range=*/nullptr, DeclaratorContext::TemplateArgContext);
1531 return Actions.ActOnTemplateTypeArgument(TypeArg);
1532 }
1533
1534 // Try to parse a template template argument.
1535 {
1536 TentativeParsingAction TPA(*this);
1537
1538 ParsedTemplateArgument TemplateTemplateArgument
1539 = ParseTemplateTemplateArgument();
1540 if (!TemplateTemplateArgument.isInvalid()) {
1541 TPA.Commit();
1542 return TemplateTemplateArgument;
1543 }
1544
1545 // Revert this tentative parse to parse a non-type template argument.
1546 TPA.Revert();
1547 }
1548
1549 // Parse a non-type template argument.
1550 SourceLocation Loc = Tok.getLocation();
1551 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
1552 if (ExprArg.isInvalid() || !ExprArg.get()) {
1553 return ParsedTemplateArgument();
1554 }
1555
1556 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1557 ExprArg.get(), Loc);
1558}
1559
1560/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1561/// (C++ [temp.names]). Returns true if there was an error.
1562///
1563/// template-argument-list: [C++ 14.2]
1564/// template-argument
1565/// template-argument-list ',' template-argument
1566bool
1567Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
1568
1569 ColonProtectionRAIIObject ColonProtection(*this, false);
1570
1571 do {
1572 ParsedTemplateArgument Arg = ParseTemplateArgument();
1573 SourceLocation EllipsisLoc;
1574 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1575 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1576
1577 if (Arg.isInvalid())
1578 return true;
1579
1580 // Save this template argument.
1581 TemplateArgs.push_back(Arg);
1582
1583 // If the next token is a comma, consume it and keep reading
1584 // arguments.
1585 } while (TryConsumeToken(tok::comma));
1586
1587 return false;
1588}
1589
1590/// Parse a C++ explicit template instantiation
1591/// (C++ [temp.explicit]).
1592///
1593/// explicit-instantiation:
1594/// 'extern' [opt] 'template' declaration
1595///
1596/// Note that the 'extern' is a GNU extension and C++11 feature.
1597Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
1598 SourceLocation ExternLoc,
1599 SourceLocation TemplateLoc,
1600 SourceLocation &DeclEnd,
1601 ParsedAttributes &AccessAttrs,
1602 AccessSpecifier AS) {
1603 // This isn't really required here.
1604 ParsingDeclRAIIObject
1605 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1606
1607 return ParseSingleDeclarationAfterTemplate(
1608 Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
1609 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
1610}
1611
1612SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1613 if (TemplateParams)
1614 return getTemplateParamsRange(TemplateParams->data(),
1615 TemplateParams->size());
1616
1617 SourceRange R(TemplateLoc);
1618 if (ExternLoc.isValid())
1619 R.setBegin(ExternLoc);
1620 return R;
1621}
1622
1623void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1624 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1
Calling 'Parser::ParseLateTemplatedFuncDef'
1625}
1626
1627/// Late parse a C++ function template in Microsoft mode.
1628void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1629 if (!LPT.D)
2
Assuming field 'D' is non-null
3
Taking false branch
1630 return;
1631
1632 // Destroy TemplateIdAnnotations when we're done, if possible.
1633 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
1634
1635 // Get the FunctionDecl.
1636 FunctionDecl *FunD = LPT.D->getAsFunction();
4
'FunD' initialized here
1637 // Track template parameter depth.
1638 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1639
1640 // To restore the context after late parsing.
1641 Sema::ContextRAII GlobalSavedContext(
1642 Actions, Actions.Context.getTranslationUnitDecl());
1643
1644 MultiParseScope Scopes(*this);
1645
1646 // Get the list of DeclContexts to reenter.
1647 SmallVector<DeclContext*, 4> DeclContextsToReenter;
1648 for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
5
Assuming 'DC' is null
6
Assuming pointer value is null
1649 DC = DC->getLexicalParent())
1650 DeclContextsToReenter.push_back(DC);
1651
1652 // Reenter scopes from outermost to innermost.
1653 for (DeclContext *DC : reverse(DeclContextsToReenter)) {
1654 CurTemplateDepthTracker.addDepth(
1655 ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
1656 Scopes.Enter(Scope::DeclScope);
1657 // We'll reenter the function context itself below.
1658 if (DC != FunD)
1659 Actions.PushDeclContext(Actions.getCurScope(), DC);
1660 }
1661
1662 assert(!LPT.Toks.empty() && "Empty body!")((!LPT.Toks.empty() && "Empty body!") ? static_cast<
void> (0) : __assert_fail ("!LPT.Toks.empty() && \"Empty body!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1662, __PRETTY_FUNCTION__))
;
7
'?' condition is true
1663
1664 // Append the current token at the end of the new token stream so that it
1665 // doesn't get lost.
1666 LPT.Toks.push_back(Tok);
1667 PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
1668
1669 // Consume the previously pushed token.
1670 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1671 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&((Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
"Inline method not starting with '{', ':' or 'try'") ? static_cast
<void> (0) : __assert_fail ("Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) && \"Inline method not starting with '{', ':' or 'try'\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1672, __PRETTY_FUNCTION__))
8
'?' condition is true
1672 "Inline method not starting with '{', ':' or 'try'")((Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
"Inline method not starting with '{', ':' or 'try'") ? static_cast
<void> (0) : __assert_fail ("Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) && \"Inline method not starting with '{', ':' or 'try'\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1672, __PRETTY_FUNCTION__))
;
1673
1674 // Parse the method body. Function body parsing code is similar enough
1675 // to be re-used for method bodies as well.
1676 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
1677 Scope::CompoundStmtScope);
1678
1679 // Recreate the containing function DeclContext.
1680 Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
9
Called C++ object pointer is null
1681
1682 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1683
1684 if (Tok.is(tok::kw_try)) {
1685 ParseFunctionTryBlock(LPT.D, FnScope);
1686 } else {
1687 if (Tok.is(tok::colon))
1688 ParseConstructorInitializer(LPT.D);
1689 else
1690 Actions.ActOnDefaultCtorInitializers(LPT.D);
1691
1692 if (Tok.is(tok::l_brace)) {
1693 assert((!isa<FunctionTemplateDecl>(LPT.D) ||(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
1694 cast<FunctionTemplateDecl>(LPT.D)(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
1695 ->getTemplateParameters()(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
1696 ->getDepth() == TemplateParameterDepth - 1) &&(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
1697 "TemplateParameterDepth should be greater than the depth of "(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
1698 "current template being instantiated!")(((!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl
>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth
- 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? static_cast<void
> (0) : __assert_fail ("(!isa<FunctionTemplateDecl>(LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters() ->getDepth() == TemplateParameterDepth - 1) && \"TemplateParameterDepth should be greater than the depth of \" \"current template being instantiated!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
;
1699 ParseFunctionStatementBody(LPT.D, FnScope);
1700 Actions.UnmarkAsLateParsedTemplate(FunD);
1701 } else
1702 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1703 }
1704}
1705
1706/// Lex a delayed template function for late parsing.
1707void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1708 tok::TokenKind kind = Tok.getKind();
1709 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1710 // Consume everything up to (and including) the matching right brace.
1711 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1712 }
1713
1714 // If we're in a function-try-block, we need to store all the catch blocks.
1715 if (kind == tok::kw_try) {
1716 while (Tok.is(tok::kw_catch)) {
1717 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1718 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1719 }
1720 }
1721}
1722
1723/// We've parsed something that could plausibly be intended to be a template
1724/// name (\p LHS) followed by a '<' token, and the following code can't possibly
1725/// be an expression. Determine if this is likely to be a template-id and if so,
1726/// diagnose it.
1727bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
1728 TentativeParsingAction TPA(*this);
1729 // FIXME: We could look at the token sequence in a lot more detail here.
1730 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
1731 StopAtSemi | StopBeforeMatch)) {
1732 TPA.Commit();
1733
1734 SourceLocation Greater;
1735 ParseGreaterThanInTemplateList(Less, Greater, true, false);
1736 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
1737 Less, Greater);
1738 return true;
1739 }
1740
1741 // There's no matching '>' token, this probably isn't supposed to be
1742 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
1743 TPA.Revert();
1744 return false;
1745}
1746
1747void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
1748 assert(Tok.is(tok::less) && "not at a potential angle bracket")((Tok.is(tok::less) && "not at a potential angle bracket"
) ? static_cast<void> (0) : __assert_fail ("Tok.is(tok::less) && \"not at a potential angle bracket\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/Parse/ParseTemplate.cpp"
, 1748, __PRETTY_FUNCTION__))
;
1749
1750 bool DependentTemplateName = false;
1751 if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
1752 DependentTemplateName))
1753 return;
1754
1755 // OK, this might be a name that the user intended to be parsed as a
1756 // template-name, followed by a '<' token. Check for some easy cases.
1757
1758 // If we have potential_template<>, then it's supposed to be a template-name.
1759 if (NextToken().is(tok::greater) ||
1760 (getLangOpts().CPlusPlus11 &&
1761 NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
1762 SourceLocation Less = ConsumeToken();
1763 SourceLocation Greater;
1764 ParseGreaterThanInTemplateList(Less, Greater, true, false);
1765 Actions.diagnoseExprIntendedAsTemplateName(
1766 getCurScope(), PotentialTemplateName, Less, Greater);
1767 // FIXME: Perform error recovery.
1768 PotentialTemplateName = ExprError();
1769 return;
1770 }
1771
1772 // If we have 'potential_template<type-id', assume it's supposed to be a
1773 // template-name if there's a matching '>' later on.
1774 {
1775 // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
1776 TentativeParsingAction TPA(*this);
1777 SourceLocation Less = ConsumeToken();
1778 if (isTypeIdUnambiguously() &&
1779 diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
1780 TPA.Commit();
1781 // FIXME: Perform error recovery.
1782 PotentialTemplateName = ExprError();
1783 return;
1784 }
1785 TPA.Revert();
1786 }
1787
1788 // Otherwise, remember that we saw this in case we see a potentially-matching
1789 // '>' token later on.
1790 AngleBracketTracker::Priority Priority =
1791 (DependentTemplateName ? AngleBracketTracker::DependentName
1792 : AngleBracketTracker::PotentialTypo) |
1793 (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
1794 : AngleBracketTracker::NoSpaceBeforeLess);
1795 AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
1796 Priority);
1797}
1798
1799bool Parser::checkPotentialAngleBracketDelimiter(
1800 const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
1801 // If a comma in an expression context is followed by a type that can be a
1802 // template argument and cannot be an expression, then this is ill-formed,
1803 // but might be intended to be part of a template-id.
1804 if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
1805 diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
1806 AngleBrackets.clear(*this);
1807 return true;
1808 }
1809
1810 // If a context that looks like a template-id is followed by '()', then
1811 // this is ill-formed, but might be intended to be a template-id
1812 // followed by '()'.
1813 if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
1814 NextToken().is(tok::r_paren)) {
1815 Actions.diagnoseExprIntendedAsTemplateName(
1816 getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
1817 OpToken.getLocation());
1818 AngleBrackets.clear(*this);
1819 return true;
1820 }
1821
1822 // After a '>' (etc), we're no longer potentially in a construct that's
1823 // intended to be treated as a template-id.
1824 if (OpToken.is(tok::greater) ||
1825 (getLangOpts().CPlusPlus11 &&
1826 OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
1827 AngleBrackets.clear(*this);
1828 return false;
1829}