Bug Summary

File:clang/lib/Parse/ParseTemplate.cpp
Warning:line 1718, 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 -clear-ast-before-backend -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 -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/build-llvm -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Parse -I /build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/clang/lib/Parse -I /build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-01-26-233846-219801-1 -x c++ /build/llvm-toolchain-snapshot-14~++20220126101029+f487a76430a0/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) &&(static_cast <bool> (Tok.isOneOf(tok::kw_export, tok::kw_template
) && "Token does not start a template declaration.") ?
void (0) : __assert_fail ("Tok.isOneOf(tok::kw_export, tok::kw_template) && \"Token does not start a template declaration.\""
, "clang/lib/Parse/ParseTemplate.cpp", 78, __extension__ __PRETTY_FUNCTION__
))
78 "Token does not start a template declaration.")(static_cast <bool> (Tok.isOneOf(tok::kw_export, tok::kw_template
) && "Token does not start a template declaration.") ?
void (0) : __assert_fail ("Tok.isOneOf(tok::kw_export, tok::kw_template) && \"Token does not start a template declaration.\""
, "clang/lib/Parse/ParseTemplate.cpp", 78, __extension__ __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.ActOnRequiresClause(ParseConstraintLogicalOrExpression(
145 /*IsTrailingRequiresClause=*/false));
146 if (!OptionalRequiresClauseConstraintER.isUsable()) {
147 // Skip until the semi-colon or a '}'.
148 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
149 TryConsumeToken(tok::semi);
150 return nullptr;
151 }
152 }
153 } else {
154 LastParamListWasEmpty = true;
155 }
156
157 ParamLists.push_back(Actions.ActOnTemplateParameterList(
158 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
159 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
160 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
161
162 // Parse the actual template declaration.
163 if (Tok.is(tok::kw_concept))
164 return ParseConceptDefinition(
165 ParsedTemplateInfo(&ParamLists, isSpecialization,
166 LastParamListWasEmpty),
167 DeclEnd);
168
169 return ParseSingleDeclarationAfterTemplate(
170 Context,
171 ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
172 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
173}
174
175/// Parse a single declaration that declares a template,
176/// template specialization, or explicit instantiation of a template.
177///
178/// \param DeclEnd will receive the source location of the last token
179/// within this declaration.
180///
181/// \param AS the access specifier associated with this
182/// declaration. Will be AS_none for namespace-scope declarations.
183///
184/// \returns the new declaration.
185Decl *Parser::ParseSingleDeclarationAfterTemplate(
186 DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
187 ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
188 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
189 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&(static_cast <bool> (TemplateInfo.Kind != ParsedTemplateInfo
::NonTemplate && "Template information required") ? void
(0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "clang/lib/Parse/ParseTemplate.cpp", 190, __extension__ __PRETTY_FUNCTION__
))
190 "Template information required")(static_cast <bool> (TemplateInfo.Kind != ParsedTemplateInfo
::NonTemplate && "Template information required") ? void
(0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "clang/lib/Parse/ParseTemplate.cpp", 190, __extension__ __PRETTY_FUNCTION__
))
;
191
192 if (Tok.is(tok::kw_static_assert)) {
193 // A static_assert declaration may not be templated.
194 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
195 << TemplateInfo.getSourceRange();
196 // Parse the static_assert declaration to improve error recovery.
197 return ParseStaticAssertDeclaration(DeclEnd);
198 }
199
200 if (Context == DeclaratorContext::Member) {
201 // We are parsing a member template.
202 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
203 &DiagsFromTParams);
204 return nullptr;
205 }
206
207 ParsedAttributesWithRange prefixAttrs(AttrFactory);
208 MaybeParseCXX11Attributes(prefixAttrs);
209
210 if (Tok.is(tok::kw_using)) {
211 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
212 prefixAttrs);
213 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
214 return nullptr;
215 return usingDeclPtr.get().getSingleDecl();
216 }
217
218 // Parse the declaration specifiers, stealing any diagnostics from
219 // the template parameters.
220 ParsingDeclSpec DS(*this, &DiagsFromTParams);
221
222 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
223 getDeclSpecContextFromDeclaratorContext(Context));
224
225 if (Tok.is(tok::semi)) {
226 ProhibitAttributes(prefixAttrs);
227 DeclEnd = ConsumeToken();
228 RecordDecl *AnonRecord = nullptr;
229 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
230 getCurScope(), AS, DS,
231 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
232 : MultiTemplateParamsArg(),
233 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
234 AnonRecord);
235 assert(!AnonRecord &&(static_cast <bool> (!AnonRecord && "Anonymous unions/structs should not be valid with template"
) ? void (0) : __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\""
, "clang/lib/Parse/ParseTemplate.cpp", 236, __extension__ __PRETTY_FUNCTION__
))
236 "Anonymous unions/structs should not be valid with template")(static_cast <bool> (!AnonRecord && "Anonymous unions/structs should not be valid with template"
) ? void (0) : __assert_fail ("!AnonRecord && \"Anonymous unions/structs should not be valid with template\""
, "clang/lib/Parse/ParseTemplate.cpp", 236, __extension__ __PRETTY_FUNCTION__
))
;
237 DS.complete(Decl);
238 return Decl;
239 }
240
241 // Move the attributes from the prefix into the DS.
242 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
243 ProhibitAttributes(prefixAttrs);
244 else
245 DS.takeAttributesFrom(prefixAttrs);
246
247 // Parse the declarator.
248 ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
249 if (TemplateInfo.TemplateParams)
250 DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
251
252 // Turn off usual access checking for template specializations and
253 // instantiations.
254 // C++20 [temp.spec] 13.9/6.
255 // This disables the access checking rules for function template explicit
256 // instantiation and explicit specialization:
257 // - parameter-list;
258 // - template-argument-list;
259 // - noexcept-specifier;
260 // - dynamic-exception-specifications (deprecated in C++11, removed since
261 // C++17).
262 bool IsTemplateSpecOrInst =
263 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
264 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
265 SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);
266
267 ParseDeclarator(DeclaratorInfo);
268
269 if (IsTemplateSpecOrInst)
270 SAC.done();
271
272 // Error parsing the declarator?
273 if (!DeclaratorInfo.hasName()) {
274 // If so, skip until the semi-colon or a }.
275 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
276 if (Tok.is(tok::semi))
277 ConsumeToken();
278 return nullptr;
279 }
280
281 llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
282 return std::string(DeclaratorInfo.getIdentifier() != nullptr
283 ? DeclaratorInfo.getIdentifier()->getName()
284 : "<unknown>");
285 });
286
287 LateParsedAttrList LateParsedAttrs(true);
288 if (DeclaratorInfo.isFunctionDeclarator()) {
289 if (Tok.is(tok::kw_requires))
290 ParseTrailingRequiresClause(DeclaratorInfo);
291
292 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
293 }
294
295 if (DeclaratorInfo.isFunctionDeclarator() &&
296 isStartOfFunctionDefinition(DeclaratorInfo)) {
297
298 // Function definitions are only allowed at file scope and in C++ classes.
299 // The C++ inline method definition case is handled elsewhere, so we only
300 // need to handle the file scope definition case.
301 if (Context != DeclaratorContext::File) {
302 Diag(Tok, diag::err_function_definition_not_allowed);
303 SkipMalformedDecl();
304 return nullptr;
305 }
306
307 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
308 // Recover by ignoring the 'typedef'. This was probably supposed to be
309 // the 'typename' keyword, which we should have already suggested adding
310 // if it's appropriate.
311 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
312 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
313 DS.ClearStorageClassSpecs();
314 }
315
316 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
317 if (DeclaratorInfo.getName().getKind() !=
318 UnqualifiedIdKind::IK_TemplateId) {
319 // If the declarator-id is not a template-id, issue a diagnostic and
320 // recover by ignoring the 'template' keyword.
321 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
322 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
323 &LateParsedAttrs);
324 } else {
325 SourceLocation LAngleLoc
326 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
327 Diag(DeclaratorInfo.getIdentifierLoc(),
328 diag::err_explicit_instantiation_with_definition)
329 << SourceRange(TemplateInfo.TemplateLoc)
330 << FixItHint::CreateInsertion(LAngleLoc, "<>");
331
332 // Recover as if it were an explicit specialization.
333 TemplateParameterLists FakedParamLists;
334 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
335 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
336 LAngleLoc, nullptr));
337
338 return ParseFunctionDefinition(
339 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
340 /*isSpecialization=*/true,
341 /*lastParameterListWasEmpty=*/true),
342 &LateParsedAttrs);
343 }
344 }
345 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
346 &LateParsedAttrs);
347 }
348
349 // Parse this declaration.
350 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
351 TemplateInfo);
352
353 if (Tok.is(tok::comma)) {
354 Diag(Tok, diag::err_multiple_template_declarators)
355 << (int)TemplateInfo.Kind;
356 SkipUntil(tok::semi);
357 return ThisDecl;
358 }
359
360 // Eat the semi colon after the declaration.
361 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
362 if (LateParsedAttrs.size() > 0)
363 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
364 DeclaratorInfo.complete(ThisDecl);
365 return ThisDecl;
366}
367
368/// \brief Parse a single declaration that declares a concept.
369///
370/// \param DeclEnd will receive the source location of the last token
371/// within this declaration.
372///
373/// \returns the new declaration.
374Decl *
375Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
376 SourceLocation &DeclEnd) {
377 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&(static_cast <bool> (TemplateInfo.Kind != ParsedTemplateInfo
::NonTemplate && "Template information required") ? void
(0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "clang/lib/Parse/ParseTemplate.cpp", 378, __extension__ __PRETTY_FUNCTION__
))
378 "Template information required")(static_cast <bool> (TemplateInfo.Kind != ParsedTemplateInfo
::NonTemplate && "Template information required") ? void
(0) : __assert_fail ("TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && \"Template information required\""
, "clang/lib/Parse/ParseTemplate.cpp", 378, __extension__ __PRETTY_FUNCTION__
))
;
379 assert(Tok.is(tok::kw_concept) &&(static_cast <bool> (Tok.is(tok::kw_concept) &&
"ParseConceptDefinition must be called when at a 'concept' keyword"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_concept) && \"ParseConceptDefinition must be called when at a 'concept' keyword\""
, "clang/lib/Parse/ParseTemplate.cpp", 380, __extension__ __PRETTY_FUNCTION__
))
380 "ParseConceptDefinition must be called when at a 'concept' keyword")(static_cast <bool> (Tok.is(tok::kw_concept) &&
"ParseConceptDefinition must be called when at a 'concept' keyword"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_concept) && \"ParseConceptDefinition must be called when at a 'concept' keyword\""
, "clang/lib/Parse/ParseTemplate.cpp", 380, __extension__ __PRETTY_FUNCTION__
))
;
381
382 ConsumeToken(); // Consume 'concept'
383
384 SourceLocation BoolKWLoc;
385 if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
386 Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
387 FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
388
389 DiagnoseAndSkipCXX11Attributes();
390
391 CXXScopeSpec SS;
392 if (ParseOptionalCXXScopeSpecifier(
393 SS, /*ObjectType=*/nullptr,
394 /*ObjectHasErrors=*/false, /*EnteringContext=*/false,
395 /*MayBePseudoDestructor=*/nullptr,
396 /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
397 SS.isInvalid()) {
398 SkipUntil(tok::semi);
399 return nullptr;
400 }
401
402 if (SS.isNotEmpty())
403 Diag(SS.getBeginLoc(),
404 diag::err_concept_definition_not_identifier);
405
406 UnqualifiedId Result;
407 if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
408 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
409 /*AllowDestructorName=*/false,
410 /*AllowConstructorName=*/false,
411 /*AllowDeductionGuide=*/false,
412 /*TemplateKWLoc=*/nullptr, Result)) {
413 SkipUntil(tok::semi);
414 return nullptr;
415 }
416
417 if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
418 Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
419 SkipUntil(tok::semi);
420 return nullptr;
421 }
422
423 IdentifierInfo *Id = Result.Identifier;
424 SourceLocation IdLoc = Result.getBeginLoc();
425
426 DiagnoseAndSkipCXX11Attributes();
427
428 if (!TryConsumeToken(tok::equal)) {
429 Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
430 SkipUntil(tok::semi);
431 return nullptr;
432 }
433
434 ExprResult ConstraintExprResult =
435 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
436 if (ConstraintExprResult.isInvalid()) {
437 SkipUntil(tok::semi);
438 return nullptr;
439 }
440
441 DeclEnd = Tok.getLocation();
442 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
443 Expr *ConstraintExpr = ConstraintExprResult.get();
444 return Actions.ActOnConceptDefinition(getCurScope(),
445 *TemplateInfo.TemplateParams,
446 Id, IdLoc, ConstraintExpr);
447}
448
449/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
450/// angle brackets. Depth is the depth of this template-parameter-list, which
451/// is the number of template headers directly enclosing this template header.
452/// TemplateParams is the current list of template parameters we're building.
453/// The template parameter we parse will be added to this list. LAngleLoc and
454/// RAngleLoc will receive the positions of the '<' and '>', respectively,
455/// that enclose this template parameter list.
456///
457/// \returns true if an error occurred, false otherwise.
458bool Parser::ParseTemplateParameters(
459 MultiParseScope &TemplateScopes, unsigned Depth,
460 SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
461 SourceLocation &RAngleLoc) {
462 // Get the template parameter list.
463 if (!TryConsumeToken(tok::less, LAngleLoc)) {
464 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
465 return true;
466 }
467
468 // Try to parse the template parameter list.
469 bool Failed = false;
470 // FIXME: Missing greatergreatergreater support.
471 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
472 TemplateScopes.Enter(Scope::TemplateParamScope);
473 Failed = ParseTemplateParameterList(Depth, TemplateParams);
474 }
475
476 if (Tok.is(tok::greatergreater)) {
477 // No diagnostic required here: a template-parameter-list can only be
478 // followed by a declaration or, for a template template parameter, the
479 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
480 // This matters for elegant diagnosis of:
481 // template<template<typename>> struct S;
482 Tok.setKind(tok::greater);
483 RAngleLoc = Tok.getLocation();
484 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
485 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
486 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
487 return true;
488 }
489 return false;
490}
491
492/// ParseTemplateParameterList - Parse a template parameter list. If
493/// the parsing fails badly (i.e., closing bracket was left out), this
494/// will try to put the token stream in a reasonable position (closing
495/// a statement, etc.) and return false.
496///
497/// template-parameter-list: [C++ temp]
498/// template-parameter
499/// template-parameter-list ',' template-parameter
500bool
501Parser::ParseTemplateParameterList(const unsigned Depth,
502 SmallVectorImpl<NamedDecl*> &TemplateParams) {
503 while (true) {
504
505 if (NamedDecl *TmpParam
506 = ParseTemplateParameter(Depth, TemplateParams.size())) {
507 TemplateParams.push_back(TmpParam);
508 } else {
509 // If we failed to parse a template parameter, skip until we find
510 // a comma or closing brace.
511 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
512 StopAtSemi | StopBeforeMatch);
513 }
514
515 // Did we find a comma or the end of the template parameter list?
516 if (Tok.is(tok::comma)) {
517 ConsumeToken();
518 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
519 // Don't consume this... that's done by template parser.
520 break;
521 } else {
522 // Somebody probably forgot to close the template. Skip ahead and
523 // try to get out of the expression. This error is currently
524 // subsumed by whatever goes on in ParseTemplateParameter.
525 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
526 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
527 StopAtSemi | StopBeforeMatch);
528 return false;
529 }
530 }
531 return true;
532}
533
534/// Determine whether the parser is at the start of a template
535/// type parameter.
536Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
537 if (Tok.is(tok::kw_class)) {
538 // "class" may be the start of an elaborated-type-specifier or a
539 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
540 switch (NextToken().getKind()) {
541 case tok::equal:
542 case tok::comma:
543 case tok::greater:
544 case tok::greatergreater:
545 case tok::ellipsis:
546 return TPResult::True;
547
548 case tok::identifier:
549 // This may be either a type-parameter or an elaborated-type-specifier.
550 // We have to look further.
551 break;
552
553 default:
554 return TPResult::False;
555 }
556
557 switch (GetLookAheadToken(2).getKind()) {
558 case tok::equal:
559 case tok::comma:
560 case tok::greater:
561 case tok::greatergreater:
562 return TPResult::True;
563
564 default:
565 return TPResult::False;
566 }
567 }
568
569 if (TryAnnotateTypeConstraint())
570 return TPResult::Error;
571
572 if (isTypeConstraintAnnotation() &&
573 // Next token might be 'auto' or 'decltype', indicating that this
574 // type-constraint is in fact part of a placeholder-type-specifier of a
575 // non-type template parameter.
576 !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
577 .isOneOf(tok::kw_auto, tok::kw_decltype))
578 return TPResult::True;
579
580 // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
581 // ill-formed otherwise.
582 if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
583 return TPResult::False;
584
585 // C++ [temp.param]p2:
586 // There is no semantic difference between class and typename in a
587 // template-parameter. typename followed by an unqualified-id
588 // names a template type parameter. typename followed by a
589 // qualified-id denotes the type in a non-type
590 // parameter-declaration.
591 Token Next = NextToken();
592
593 // If we have an identifier, skip over it.
594 if (Next.getKind() == tok::identifier)
595 Next = GetLookAheadToken(2);
596
597 switch (Next.getKind()) {
598 case tok::equal:
599 case tok::comma:
600 case tok::greater:
601 case tok::greatergreater:
602 case tok::ellipsis:
603 return TPResult::True;
604
605 case tok::kw_typename:
606 case tok::kw_typedef:
607 case tok::kw_class:
608 // These indicate that a comma was missed after a type parameter, not that
609 // we have found a non-type parameter.
610 return TPResult::True;
611
612 default:
613 return TPResult::False;
614 }
615}
616
617/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
618///
619/// template-parameter: [C++ temp.param]
620/// type-parameter
621/// parameter-declaration
622///
623/// type-parameter: (See below)
624/// type-parameter-key ...[opt] identifier[opt]
625/// type-parameter-key identifier[opt] = type-id
626/// (C++2a) type-constraint ...[opt] identifier[opt]
627/// (C++2a) type-constraint identifier[opt] = type-id
628/// 'template' '<' template-parameter-list '>' type-parameter-key
629/// ...[opt] identifier[opt]
630/// 'template' '<' template-parameter-list '>' type-parameter-key
631/// identifier[opt] '=' id-expression
632///
633/// type-parameter-key:
634/// class
635/// typename
636///
637NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
638
639 switch (isStartOfTemplateTypeParameter()) {
640 case TPResult::True:
641 // Is there just a typo in the input code? ('typedef' instead of
642 // 'typename')
643 if (Tok.is(tok::kw_typedef)) {
644 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
645
646 Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
647 << FixItHint::CreateReplacement(CharSourceRange::getCharRange(
648 Tok.getLocation(),
649 Tok.getEndLoc()),
650 "typename");
651
652 Tok.setKind(tok::kw_typename);
653 }
654
655 return ParseTypeParameter(Depth, Position);
656 case TPResult::False:
657 break;
658
659 case TPResult::Error: {
660 // We return an invalid parameter as opposed to null to avoid having bogus
661 // diagnostics about an empty template parameter list.
662 // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
663 // from here.
664 // Return a NTTP as if there was an error in a scope specifier, the user
665 // probably meant to write the type of a NTTP.
666 DeclSpec DS(getAttrFactory());
667 DS.SetTypeSpecError();
668 Declarator D(DS, DeclaratorContext::TemplateParam);
669 D.SetIdentifier(nullptr, Tok.getLocation());
670 D.setInvalidType(true);
671 NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
672 getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
673 /*DefaultArg=*/nullptr);
674 ErrorParam->setInvalidDecl(true);
675 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
676 StopAtSemi | StopBeforeMatch);
677 return ErrorParam;
678 }
679
680 case TPResult::Ambiguous:
681 llvm_unreachable("template param classification can't be ambiguous")::llvm::llvm_unreachable_internal("template param classification can't be ambiguous"
, "clang/lib/Parse/ParseTemplate.cpp", 681)
;
682 }
683
684 if (Tok.is(tok::kw_template))
685 return ParseTemplateTemplateParameter(Depth, Position);
686
687 // If it's none of the above, then it must be a parameter declaration.
688 // NOTE: This will pick up errors in the closure of the template parameter
689 // list (e.g., template < ; Check here to implement >> style closures.
690 return ParseNonTypeTemplateParameter(Depth, Position);
691}
692
693/// Check whether the current token is a template-id annotation denoting a
694/// type-constraint.
695bool Parser::isTypeConstraintAnnotation() {
696 const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
697 if (T.isNot(tok::annot_template_id))
698 return false;
699 const auto *ExistingAnnot =
700 static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
701 return ExistingAnnot->Kind == TNK_Concept_template;
702}
703
704/// Try parsing a type-constraint at the current location.
705///
706/// type-constraint:
707/// nested-name-specifier[opt] concept-name
708/// nested-name-specifier[opt] concept-name
709/// '<' template-argument-list[opt] '>'[opt]
710///
711/// \returns true if an error occurred, and false otherwise.
712bool Parser::TryAnnotateTypeConstraint() {
713 if (!getLangOpts().CPlusPlus20)
714 return false;
715 CXXScopeSpec SS;
716 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
717 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
718 /*ObjectHasErrors=*/false,
719 /*EnteringContext=*/false,
720 /*MayBePseudoDestructor=*/nullptr,
721 // If this is not a type-constraint, then
722 // this scope-spec is part of the typename
723 // of a non-type template parameter
724 /*IsTypename=*/true, /*LastII=*/nullptr,
725 // We won't find concepts in
726 // non-namespaces anyway, so might as well
727 // parse this correctly for possible type
728 // names.
729 /*OnlyNamespace=*/false))
730 return true;
731
732 if (Tok.is(tok::identifier)) {
733 UnqualifiedId PossibleConceptName;
734 PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
735 Tok.getLocation());
736
737 TemplateTy PossibleConcept;
738 bool MemberOfUnknownSpecialization = false;
739 auto TNK = Actions.isTemplateName(getCurScope(), SS,
740 /*hasTemplateKeyword=*/false,
741 PossibleConceptName,
742 /*ObjectType=*/ParsedType(),
743 /*EnteringContext=*/false,
744 PossibleConcept,
745 MemberOfUnknownSpecialization,
746 /*Disambiguation=*/true);
747 if (MemberOfUnknownSpecialization || !PossibleConcept ||
748 TNK != TNK_Concept_template) {
749 if (SS.isNotEmpty())
750 AnnotateScopeToken(SS, !WasScopeAnnotation);
751 return false;
752 }
753
754 // At this point we're sure we're dealing with a constrained parameter. It
755 // may or may not have a template parameter list following the concept
756 // name.
757 if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
758 /*TemplateKWLoc=*/SourceLocation(),
759 PossibleConceptName,
760 /*AllowTypeAnnotation=*/false,
761 /*TypeConstraint=*/true))
762 return true;
763 }
764
765 if (SS.isNotEmpty())
766 AnnotateScopeToken(SS, !WasScopeAnnotation);
767 return false;
768}
769
770/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
771/// Other kinds of template parameters are parsed in
772/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
773///
774/// type-parameter: [C++ temp.param]
775/// 'class' ...[opt][C++0x] identifier[opt]
776/// 'class' identifier[opt] '=' type-id
777/// 'typename' ...[opt][C++0x] identifier[opt]
778/// 'typename' identifier[opt] '=' type-id
779NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
780 assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||(static_cast <bool> ((Tok.isOneOf(tok::kw_class, tok::kw_typename
) || isTypeConstraintAnnotation()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? void (0) : __assert_fail ("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "clang/lib/Parse/ParseTemplate.cpp", 783, __extension__ __PRETTY_FUNCTION__
))
781 isTypeConstraintAnnotation()) &&(static_cast <bool> ((Tok.isOneOf(tok::kw_class, tok::kw_typename
) || isTypeConstraintAnnotation()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? void (0) : __assert_fail ("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "clang/lib/Parse/ParseTemplate.cpp", 783, __extension__ __PRETTY_FUNCTION__
))
782 "A type-parameter starts with 'class', 'typename' or a "(static_cast <bool> ((Tok.isOneOf(tok::kw_class, tok::kw_typename
) || isTypeConstraintAnnotation()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? void (0) : __assert_fail ("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "clang/lib/Parse/ParseTemplate.cpp", 783, __extension__ __PRETTY_FUNCTION__
))
783 "type-constraint")(static_cast <bool> ((Tok.isOneOf(tok::kw_class, tok::kw_typename
) || isTypeConstraintAnnotation()) && "A type-parameter starts with 'class', 'typename' or a "
"type-constraint") ? void (0) : __assert_fail ("(Tok.isOneOf(tok::kw_class, tok::kw_typename) || isTypeConstraintAnnotation()) && \"A type-parameter starts with 'class', 'typename' or a \" \"type-constraint\""
, "clang/lib/Parse/ParseTemplate.cpp", 783, __extension__ __PRETTY_FUNCTION__
))
;
784
785 CXXScopeSpec TypeConstraintSS;
786 TemplateIdAnnotation *TypeConstraint = nullptr;
787 bool TypenameKeyword = false;
788 SourceLocation KeyLoc;
789 ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
790 /*ObjectHasErrors=*/false,
791 /*EnteringContext*/ false);
792 if (Tok.is(tok::annot_template_id)) {
793 // Consume the 'type-constraint'.
794 TypeConstraint =
795 static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
796 assert(TypeConstraint->Kind == TNK_Concept_template &&(static_cast <bool> (TypeConstraint->Kind == TNK_Concept_template
&& "stray non-concept template-id annotation") ? void
(0) : __assert_fail ("TypeConstraint->Kind == TNK_Concept_template && \"stray non-concept template-id annotation\""
, "clang/lib/Parse/ParseTemplate.cpp", 797, __extension__ __PRETTY_FUNCTION__
))
797 "stray non-concept template-id annotation")(static_cast <bool> (TypeConstraint->Kind == TNK_Concept_template
&& "stray non-concept template-id annotation") ? void
(0) : __assert_fail ("TypeConstraint->Kind == TNK_Concept_template && \"stray non-concept template-id annotation\""
, "clang/lib/Parse/ParseTemplate.cpp", 797, __extension__ __PRETTY_FUNCTION__
))
;
798 KeyLoc = ConsumeAnnotationToken();
799 } else {
800 assert(TypeConstraintSS.isEmpty() &&(static_cast <bool> (TypeConstraintSS.isEmpty() &&
"expected type constraint after scope specifier") ? void (0)
: __assert_fail ("TypeConstraintSS.isEmpty() && \"expected type constraint after scope specifier\""
, "clang/lib/Parse/ParseTemplate.cpp", 801, __extension__ __PRETTY_FUNCTION__
))
801 "expected type constraint after scope specifier")(static_cast <bool> (TypeConstraintSS.isEmpty() &&
"expected type constraint after scope specifier") ? void (0)
: __assert_fail ("TypeConstraintSS.isEmpty() && \"expected type constraint after scope specifier\""
, "clang/lib/Parse/ParseTemplate.cpp", 801, __extension__ __PRETTY_FUNCTION__
))
;
802
803 // Consume the 'class' or 'typename' keyword.
804 TypenameKeyword = Tok.is(tok::kw_typename);
805 KeyLoc = ConsumeToken();
806 }
807
808 // Grab the ellipsis (if given).
809 SourceLocation EllipsisLoc;
810 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
811 Diag(EllipsisLoc,
812 getLangOpts().CPlusPlus11
813 ? diag::warn_cxx98_compat_variadic_templates
814 : diag::ext_variadic_templates);
815 }
816
817 // Grab the template parameter name (if given)
818 SourceLocation NameLoc = Tok.getLocation();
819 IdentifierInfo *ParamName = nullptr;
820 if (Tok.is(tok::identifier)) {
821 ParamName = Tok.getIdentifierInfo();
822 ConsumeToken();
823 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
824 tok::greatergreater)) {
825 // Unnamed template parameter. Don't have to do anything here, just
826 // don't consume this token.
827 } else {
828 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
829 return nullptr;
830 }
831
832 // Recover from misplaced ellipsis.
833 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
834 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
835 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
836
837 // Grab a default argument (if available).
838 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
839 // we introduce the type parameter into the local scope.
840 SourceLocation EqualLoc;
841 ParsedType DefaultArg;
842 if (TryConsumeToken(tok::equal, EqualLoc))
843 DefaultArg =
844 ParseTypeName(/*Range=*/nullptr, DeclaratorContext::TemplateTypeArg)
845 .get();
846
847 NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
848 TypenameKeyword, EllipsisLoc,
849 KeyLoc, ParamName, NameLoc,
850 Depth, Position, EqualLoc,
851 DefaultArg,
852 TypeConstraint != nullptr);
853
854 if (TypeConstraint) {
855 Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
856 cast<TemplateTypeParmDecl>(NewDecl),
857 EllipsisLoc);
858 }
859
860 return NewDecl;
861}
862
863/// ParseTemplateTemplateParameter - Handle the parsing of template
864/// template parameters.
865///
866/// type-parameter: [C++ temp.param]
867/// 'template' '<' template-parameter-list '>' type-parameter-key
868/// ...[opt] identifier[opt]
869/// 'template' '<' template-parameter-list '>' type-parameter-key
870/// identifier[opt] = id-expression
871/// type-parameter-key:
872/// 'class'
873/// 'typename' [C++1z]
874NamedDecl *
875Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
876 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword")(static_cast <bool> (Tok.is(tok::kw_template) &&
"Expected 'template' keyword") ? void (0) : __assert_fail ("Tok.is(tok::kw_template) && \"Expected 'template' keyword\""
, "clang/lib/Parse/ParseTemplate.cpp", 876, __extension__ __PRETTY_FUNCTION__
))
;
877
878 // Handle the template <...> part.
879 SourceLocation TemplateLoc = ConsumeToken();
880 SmallVector<NamedDecl*,8> TemplateParams;
881 SourceLocation LAngleLoc, RAngleLoc;
882 {
883 MultiParseScope TemplateParmScope(*this);
884 if (ParseTemplateParameters(TemplateParmScope, Depth + 1, TemplateParams,
885 LAngleLoc, RAngleLoc)) {
886 return nullptr;
887 }
888 }
889
890 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
891 // Generate a meaningful error if the user forgot to put class before the
892 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
893 // or greater appear immediately or after 'struct'. In the latter case,
894 // replace the keyword with 'class'.
895 if (!TryConsumeToken(tok::kw_class)) {
896 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
897 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
898 if (Tok.is(tok::kw_typename)) {
899 Diag(Tok.getLocation(),
900 getLangOpts().CPlusPlus17
901 ? diag::warn_cxx14_compat_template_template_param_typename
902 : diag::ext_template_template_param_typename)
903 << (!getLangOpts().CPlusPlus17
904 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
905 : FixItHint());
906 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
907 tok::greatergreater, tok::ellipsis)) {
908 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
909 << getLangOpts().CPlusPlus17
910 << (Replace
911 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
912 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
913 } else
914 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
915 << getLangOpts().CPlusPlus17;
916
917 if (Replace)
918 ConsumeToken();
919 }
920
921 // Parse the ellipsis, if given.
922 SourceLocation EllipsisLoc;
923 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
924 Diag(EllipsisLoc,
925 getLangOpts().CPlusPlus11
926 ? diag::warn_cxx98_compat_variadic_templates
927 : diag::ext_variadic_templates);
928
929 // Get the identifier, if given.
930 SourceLocation NameLoc = Tok.getLocation();
931 IdentifierInfo *ParamName = nullptr;
932 if (Tok.is(tok::identifier)) {
933 ParamName = Tok.getIdentifierInfo();
934 ConsumeToken();
935 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
936 tok::greatergreater)) {
937 // Unnamed template parameter. Don't have to do anything here, just
938 // don't consume this token.
939 } else {
940 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
941 return nullptr;
942 }
943
944 // Recover from misplaced ellipsis.
945 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
946 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
947 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
948
949 TemplateParameterList *ParamList =
950 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
951 TemplateLoc, LAngleLoc,
952 TemplateParams,
953 RAngleLoc, nullptr);
954
955 // Grab a default argument (if available).
956 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
957 // we introduce the template parameter into the local scope.
958 SourceLocation EqualLoc;
959 ParsedTemplateArgument DefaultArg;
960 if (TryConsumeToken(tok::equal, EqualLoc)) {
961 DefaultArg = ParseTemplateTemplateArgument();
962 if (DefaultArg.isInvalid()) {
963 Diag(Tok.getLocation(),
964 diag::err_default_template_template_parameter_not_template);
965 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
966 StopAtSemi | StopBeforeMatch);
967 }
968 }
969
970 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
971 ParamList, EllipsisLoc,
972 ParamName, NameLoc, Depth,
973 Position, EqualLoc, DefaultArg);
974}
975
976/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
977/// template parameters (e.g., in "template<int Size> class array;").
978///
979/// template-parameter:
980/// ...
981/// parameter-declaration
982NamedDecl *
983Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
984 // Parse the declaration-specifiers (i.e., the type).
985 // FIXME: The type should probably be restricted in some way... Not all
986 // declarators (parts of declarators?) are accepted for parameters.
987 DeclSpec DS(AttrFactory);
988 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
989 DeclSpecContext::DSC_template_param);
990
991 // Parse this as a typename.
992 Declarator ParamDecl(DS, DeclaratorContext::TemplateParam);
993 ParseDeclarator(ParamDecl);
994 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
995 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
996 return nullptr;
997 }
998
999 // Recover from misplaced ellipsis.
1000 SourceLocation EllipsisLoc;
1001 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1002 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
1003
1004 // If there is a default value, parse it.
1005 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
1006 // we introduce the template parameter into the local scope.
1007 SourceLocation EqualLoc;
1008 ExprResult DefaultArg;
1009 if (TryConsumeToken(tok::equal, EqualLoc)) {
1010 // C++ [temp.param]p15:
1011 // When parsing a default template-argument for a non-type
1012 // template-parameter, the first non-nested > is taken as the
1013 // end of the template-parameter-list rather than a greater-than
1014 // operator.
1015 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
1016 EnterExpressionEvaluationContext ConstantEvaluated(
1017 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1018
1019 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
1020 if (DefaultArg.isInvalid())
1021 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
1022 }
1023
1024 // Create the parameter.
1025 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
1026 Depth, Position, EqualLoc,
1027 DefaultArg.get());
1028}
1029
1030void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
1031 SourceLocation CorrectLoc,
1032 bool AlreadyHasEllipsis,
1033 bool IdentifierHasName) {
1034 FixItHint Insertion;
1035 if (!AlreadyHasEllipsis)
1036 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
1037 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
1038 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
1039 << !IdentifierHasName;
1040}
1041
1042void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
1043 Declarator &D) {
1044 assert(EllipsisLoc.isValid())(static_cast <bool> (EllipsisLoc.isValid()) ? void (0) :
__assert_fail ("EllipsisLoc.isValid()", "clang/lib/Parse/ParseTemplate.cpp"
, 1044, __extension__ __PRETTY_FUNCTION__))
;
1045 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
1046 if (!AlreadyHasEllipsis)
1047 D.setEllipsisLoc(EllipsisLoc);
1048 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
1049 AlreadyHasEllipsis, D.hasName());
1050}
1051
1052/// Parses a '>' at the end of a template list.
1053///
1054/// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
1055/// to determine if these tokens were supposed to be a '>' followed by
1056/// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
1057///
1058/// \param RAngleLoc the location of the consumed '>'.
1059///
1060/// \param ConsumeLastToken if true, the '>' is consumed.
1061///
1062/// \param ObjCGenericList if true, this is the '>' closing an Objective-C
1063/// type parameter or type argument list, rather than a C++ template parameter
1064/// or argument list.
1065///
1066/// \returns true, if current token does not start with '>', false otherwise.
1067bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
1068 SourceLocation &RAngleLoc,
1069 bool ConsumeLastToken,
1070 bool ObjCGenericList) {
1071 // What will be left once we've consumed the '>'.
1072 tok::TokenKind RemainingToken;
1073 const char *ReplacementStr = "> >";
1074 bool MergeWithNextToken = false;
1075
1076 switch (Tok.getKind()) {
1077 default:
1078 Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
1079 Diag(LAngleLoc, diag::note_matching) << tok::less;
1080 return true;
1081
1082 case tok::greater:
1083 // Determine the location of the '>' token. Only consume this token
1084 // if the caller asked us to.
1085 RAngleLoc = Tok.getLocation();
1086 if (ConsumeLastToken)
1087 ConsumeToken();
1088 return false;
1089
1090 case tok::greatergreater:
1091 RemainingToken = tok::greater;
1092 break;
1093
1094 case tok::greatergreatergreater:
1095 RemainingToken = tok::greatergreater;
1096 break;
1097
1098 case tok::greaterequal:
1099 RemainingToken = tok::equal;
1100 ReplacementStr = "> =";
1101
1102 // Join two adjacent '=' tokens into one, for cases like:
1103 // void (*p)() = f<int>;
1104 // return f<int>==p;
1105 if (NextToken().is(tok::equal) &&
1106 areTokensAdjacent(Tok, NextToken())) {
1107 RemainingToken = tok::equalequal;
1108 MergeWithNextToken = true;
1109 }
1110 break;
1111
1112 case tok::greatergreaterequal:
1113 RemainingToken = tok::greaterequal;
1114 break;
1115 }
1116
1117 // This template-id is terminated by a token that starts with a '>'.
1118 // Outside C++11 and Objective-C, this is now error recovery.
1119 //
1120 // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
1121 // extend that treatment to also apply to the '>>>' token.
1122 //
1123 // Objective-C allows this in its type parameter / argument lists.
1124
1125 SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
1126 SourceLocation TokLoc = Tok.getLocation();
1127 Token Next = NextToken();
1128
1129 // Whether splitting the current token after the '>' would undesirably result
1130 // in the remaining token pasting with the token after it. This excludes the
1131 // MergeWithNextToken cases, which we've already handled.
1132 bool PreventMergeWithNextToken =
1133 (RemainingToken == tok::greater ||
1134 RemainingToken == tok::greatergreater) &&
1135 (Next.isOneOf(tok::greater, tok::greatergreater,
1136 tok::greatergreatergreater, tok::equal, tok::greaterequal,
1137 tok::greatergreaterequal, tok::equalequal)) &&
1138 areTokensAdjacent(Tok, Next);
1139
1140 // Diagnose this situation as appropriate.
1141 if (!ObjCGenericList) {
1142 // The source range of the replaced token(s).
1143 CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
1144 TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
1145 getLangOpts()));
1146
1147 // A hint to put a space between the '>>'s. In order to make the hint as
1148 // clear as possible, we include the characters either side of the space in
1149 // the replacement, rather than just inserting a space at SecondCharLoc.
1150 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
1151 ReplacementStr);
1152
1153 // A hint to put another space after the token, if it would otherwise be
1154 // lexed differently.
1155 FixItHint Hint2;
1156 if (PreventMergeWithNextToken)
1157 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
1158
1159 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
1160 if (getLangOpts().CPlusPlus11 &&
1161 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
1162 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
1163 else if (Tok.is(tok::greaterequal))
1164 DiagId = diag::err_right_angle_bracket_equal_needs_space;
1165 Diag(TokLoc, DiagId) << Hint1 << Hint2;
1166 }
1167
1168 // Find the "length" of the resulting '>' token. This is not always 1, as it
1169 // can contain escaped newlines.
1170 unsigned GreaterLength = Lexer::getTokenPrefixLength(
1171 TokLoc, 1, PP.getSourceManager(), getLangOpts());
1172
1173 // Annotate the source buffer to indicate that we split the token after the
1174 // '>'. This allows us to properly find the end of, and extract the spelling
1175 // of, the '>' token later.
1176 RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
1177
1178 // Strip the initial '>' from the token.
1179 bool CachingTokens = PP.IsPreviousCachedToken(Tok);
1180
1181 Token Greater = Tok;
1182 Greater.setLocation(RAngleLoc);
1183 Greater.setKind(tok::greater);
1184 Greater.setLength(GreaterLength);
1185
1186 unsigned OldLength = Tok.getLength();
1187 if (MergeWithNextToken) {
1188 ConsumeToken();
1189 OldLength += Tok.getLength();
1190 }
1191
1192 Tok.setKind(RemainingToken);
1193 Tok.setLength(OldLength - GreaterLength);
1194
1195 // Split the second token if lexing it normally would lex a different token
1196 // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
1197 SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
1198 if (PreventMergeWithNextToken)
1199 AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
1200 Tok.setLocation(AfterGreaterLoc);
1201
1202 // Update the token cache to match what we just did if necessary.
1203 if (CachingTokens) {
1204 // If the previous cached token is being merged, delete it.
1205 if (MergeWithNextToken)
1206 PP.ReplacePreviousCachedToken({});
1207
1208 if (ConsumeLastToken)
1209 PP.ReplacePreviousCachedToken({Greater, Tok});
1210 else
1211 PP.ReplacePreviousCachedToken({Greater});
1212 }
1213
1214 if (ConsumeLastToken) {
1215 PrevTokLocation = RAngleLoc;
1216 } else {
1217 PrevTokLocation = TokBeforeGreaterLoc;
1218 PP.EnterToken(Tok, /*IsReinject=*/true);
1219 Tok = Greater;
1220 }
1221
1222 return false;
1223}
1224
1225/// Parses a template-id that after the template name has
1226/// already been parsed.
1227///
1228/// This routine takes care of parsing the enclosed template argument
1229/// list ('<' template-parameter-list [opt] '>') and placing the
1230/// results into a form that can be transferred to semantic analysis.
1231///
1232/// \param ConsumeLastToken if true, then we will consume the last
1233/// token that forms the template-id. Otherwise, we will leave the
1234/// last token in the stream (e.g., so that it can be replaced with an
1235/// annotation token).
1236///
1237/// \param NameHint is not required, and merely affects code completion.
1238bool Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
1239 SourceLocation &LAngleLoc,
1240 TemplateArgList &TemplateArgs,
1241 SourceLocation &RAngleLoc,
1242 TemplateTy Template) {
1243 assert(Tok.is(tok::less) && "Must have already parsed the template-name")(static_cast <bool> (Tok.is(tok::less) && "Must have already parsed the template-name"
) ? void (0) : __assert_fail ("Tok.is(tok::less) && \"Must have already parsed the template-name\""
, "clang/lib/Parse/ParseTemplate.cpp", 1243, __extension__ __PRETTY_FUNCTION__
))
;
1244
1245 // Consume the '<'.
1246 LAngleLoc = ConsumeToken();
1247
1248 // Parse the optional template-argument-list.
1249 bool Invalid = false;
1250 {
1251 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
1252 if (!Tok.isOneOf(tok::greater, tok::greatergreater,
1253 tok::greatergreatergreater, tok::greaterequal,
1254 tok::greatergreaterequal))
1255 Invalid = ParseTemplateArgumentList(TemplateArgs, Template, LAngleLoc);
1256
1257 if (Invalid) {
1258 // Try to find the closing '>'.
1259 if (getLangOpts().CPlusPlus11)
1260 SkipUntil(tok::greater, tok::greatergreater,
1261 tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
1262 else
1263 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
1264 }
1265 }
1266
1267 return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
1268 /*ObjCGenericList=*/false) ||
1269 Invalid;
1270}
1271
1272/// Replace the tokens that form a simple-template-id with an
1273/// annotation token containing the complete template-id.
1274///
1275/// The first token in the stream must be the name of a template that
1276/// is followed by a '<'. This routine will parse the complete
1277/// simple-template-id and replace the tokens with a single annotation
1278/// token with one of two different kinds: if the template-id names a
1279/// type (and \p AllowTypeAnnotation is true), the annotation token is
1280/// a type annotation that includes the optional nested-name-specifier
1281/// (\p SS). Otherwise, the annotation token is a template-id
1282/// annotation that does not include the optional
1283/// nested-name-specifier.
1284///
1285/// \param Template the declaration of the template named by the first
1286/// token (an identifier), as returned from \c Action::isTemplateName().
1287///
1288/// \param TNK the kind of template that \p Template
1289/// refers to, as returned from \c Action::isTemplateName().
1290///
1291/// \param SS if non-NULL, the nested-name-specifier that precedes
1292/// this template name.
1293///
1294/// \param TemplateKWLoc if valid, specifies that this template-id
1295/// annotation was preceded by the 'template' keyword and gives the
1296/// location of that keyword. If invalid (the default), then this
1297/// template-id was not preceded by a 'template' keyword.
1298///
1299/// \param AllowTypeAnnotation if true (the default), then a
1300/// simple-template-id that refers to a class template, template
1301/// template parameter, or other template that produces a type will be
1302/// replaced with a type annotation token. Otherwise, the
1303/// simple-template-id is always replaced with a template-id
1304/// annotation token.
1305///
1306/// \param TypeConstraint if true, then this is actually a type-constraint,
1307/// meaning that the template argument list can be omitted (and the template in
1308/// question must be a concept).
1309///
1310/// If an unrecoverable parse error occurs and no annotation token can be
1311/// formed, this function returns true.
1312///
1313bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
1314 CXXScopeSpec &SS,
1315 SourceLocation TemplateKWLoc,
1316 UnqualifiedId &TemplateName,
1317 bool AllowTypeAnnotation,
1318 bool TypeConstraint) {
1319 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++")(static_cast <bool> (getLangOpts().CPlusPlus &&
"Can only annotate template-ids in C++") ? void (0) : __assert_fail
("getLangOpts().CPlusPlus && \"Can only annotate template-ids in C++\""
, "clang/lib/Parse/ParseTemplate.cpp", 1319, __extension__ __PRETTY_FUNCTION__
))
;
1320 assert((Tok.is(tok::less) || TypeConstraint) &&(static_cast <bool> ((Tok.is(tok::less) || TypeConstraint
) && "Parser isn't at the beginning of a template-id"
) ? void (0) : __assert_fail ("(Tok.is(tok::less) || TypeConstraint) && \"Parser isn't at the beginning of a template-id\""
, "clang/lib/Parse/ParseTemplate.cpp", 1321, __extension__ __PRETTY_FUNCTION__
))
1321 "Parser isn't at the beginning of a template-id")(static_cast <bool> ((Tok.is(tok::less) || TypeConstraint
) && "Parser isn't at the beginning of a template-id"
) ? void (0) : __assert_fail ("(Tok.is(tok::less) || TypeConstraint) && \"Parser isn't at the beginning of a template-id\""
, "clang/lib/Parse/ParseTemplate.cpp", 1321, __extension__ __PRETTY_FUNCTION__
))
;
1322 assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "(static_cast <bool> (!(TypeConstraint && AllowTypeAnnotation
) && "type-constraint can't be " "a type annotation")
? void (0) : __assert_fail ("!(TypeConstraint && AllowTypeAnnotation) && \"type-constraint can't be \" \"a type annotation\""
, "clang/lib/Parse/ParseTemplate.cpp", 1323, __extension__ __PRETTY_FUNCTION__
))
1323 "a type annotation")(static_cast <bool> (!(TypeConstraint && AllowTypeAnnotation
) && "type-constraint can't be " "a type annotation")
? void (0) : __assert_fail ("!(TypeConstraint && AllowTypeAnnotation) && \"type-constraint can't be \" \"a type annotation\""
, "clang/lib/Parse/ParseTemplate.cpp", 1323, __extension__ __PRETTY_FUNCTION__
))
;
1324 assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "(static_cast <bool> ((!TypeConstraint || TNK == TNK_Concept_template
) && "type-constraint " "must accompany a concept name"
) ? void (0) : __assert_fail ("(!TypeConstraint || TNK == TNK_Concept_template) && \"type-constraint \" \"must accompany a concept name\""
, "clang/lib/Parse/ParseTemplate.cpp", 1325, __extension__ __PRETTY_FUNCTION__
))
1325 "must accompany a concept name")(static_cast <bool> ((!TypeConstraint || TNK == TNK_Concept_template
) && "type-constraint " "must accompany a concept name"
) ? void (0) : __assert_fail ("(!TypeConstraint || TNK == TNK_Concept_template) && \"type-constraint \" \"must accompany a concept name\""
, "clang/lib/Parse/ParseTemplate.cpp", 1325, __extension__ __PRETTY_FUNCTION__
))
;
1326 assert((Template || TNK == TNK_Non_template) && "missing template name")(static_cast <bool> ((Template || TNK == TNK_Non_template
) && "missing template name") ? void (0) : __assert_fail
("(Template || TNK == TNK_Non_template) && \"missing template name\""
, "clang/lib/Parse/ParseTemplate.cpp", 1326, __extension__ __PRETTY_FUNCTION__
))
;
1327
1328 // Consume the template-name.
1329 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
1330
1331 // Parse the enclosed template argument list.
1332 SourceLocation LAngleLoc, RAngleLoc;
1333 TemplateArgList TemplateArgs;
1334 bool ArgsInvalid = false;
1335 if (!TypeConstraint || Tok.is(tok::less)) {
1336 ArgsInvalid = ParseTemplateIdAfterTemplateName(
1337 false, LAngleLoc, TemplateArgs, RAngleLoc, Template);
1338 // If we couldn't recover from invalid arguments, don't form an annotation
1339 // token -- we don't know how much to annotate.
1340 // FIXME: This can lead to duplicate diagnostics if we retry parsing this
1341 // template-id in another context. Try to annotate anyway?
1342 if (RAngleLoc.isInvalid())
1343 return true;
1344 }
1345
1346 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
1347
1348 // Build the annotation token.
1349 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
1350 TypeResult Type = ArgsInvalid
1351 ? TypeError()
1352 : Actions.ActOnTemplateIdType(
1353 getCurScope(), SS, TemplateKWLoc, Template,
1354 TemplateName.Identifier, TemplateNameLoc,
1355 LAngleLoc, TemplateArgsPtr, RAngleLoc);
1356
1357 Tok.setKind(tok::annot_typename);
1358 setTypeAnnotation(Tok, Type);
1359 if (SS.isNotEmpty())
1360 Tok.setLocation(SS.getBeginLoc());
1361 else if (TemplateKWLoc.isValid())
1362 Tok.setLocation(TemplateKWLoc);
1363 else
1364 Tok.setLocation(TemplateNameLoc);
1365 } else {
1366 // Build a template-id annotation token that can be processed
1367 // later.
1368 Tok.setKind(tok::annot_template_id);
1369
1370 IdentifierInfo *TemplateII =
1371 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1372 ? TemplateName.Identifier
1373 : nullptr;
1374
1375 OverloadedOperatorKind OpKind =
1376 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
1377 ? OO_None
1378 : TemplateName.OperatorFunctionId.Operator;
1379
1380 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
1381 TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
1382 LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
1383
1384 Tok.setAnnotationValue(TemplateId);
1385 if (TemplateKWLoc.isValid())
1386 Tok.setLocation(TemplateKWLoc);
1387 else
1388 Tok.setLocation(TemplateNameLoc);
1389 }
1390
1391 // Common fields for the annotation token
1392 Tok.setAnnotationEndLoc(RAngleLoc);
1393
1394 // In case the tokens were cached, have Preprocessor replace them with the
1395 // annotation token.
1396 PP.AnnotateCachedTokens(Tok);
1397 return false;
1398}
1399
1400/// Replaces a template-id annotation token with a type
1401/// annotation token.
1402///
1403/// If there was a failure when forming the type from the template-id,
1404/// a type annotation token will still be created, but will have a
1405/// NULL type pointer to signify an error.
1406///
1407/// \param SS The scope specifier appearing before the template-id, if any.
1408///
1409/// \param IsClassName Is this template-id appearing in a context where we
1410/// know it names a class, such as in an elaborated-type-specifier or
1411/// base-specifier? ('typename' and 'template' are unneeded and disallowed
1412/// in those contexts.)
1413void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
1414 bool IsClassName) {
1415 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens")(static_cast <bool> (Tok.is(tok::annot_template_id) &&
"Requires template-id tokens") ? void (0) : __assert_fail ("Tok.is(tok::annot_template_id) && \"Requires template-id tokens\""
, "clang/lib/Parse/ParseTemplate.cpp", 1415, __extension__ __PRETTY_FUNCTION__
))
;
1416
1417 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1418 assert(TemplateId->mightBeType() &&(static_cast <bool> (TemplateId->mightBeType() &&
"Only works for type and dependent templates") ? void (0) : __assert_fail
("TemplateId->mightBeType() && \"Only works for type and dependent templates\""
, "clang/lib/Parse/ParseTemplate.cpp", 1419, __extension__ __PRETTY_FUNCTION__
))
1419 "Only works for type and dependent templates")(static_cast <bool> (TemplateId->mightBeType() &&
"Only works for type and dependent templates") ? void (0) : __assert_fail
("TemplateId->mightBeType() && \"Only works for type and dependent templates\""
, "clang/lib/Parse/ParseTemplate.cpp", 1419, __extension__ __PRETTY_FUNCTION__
))
;
1420
1421 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1422 TemplateId->NumArgs);
1423
1424 TypeResult Type =
1425 TemplateId->isInvalid()
1426 ? TypeError()
1427 : Actions.ActOnTemplateIdType(
1428 getCurScope(), SS, TemplateId->TemplateKWLoc,
1429 TemplateId->Template, TemplateId->Name,
1430 TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
1431 TemplateArgsPtr, TemplateId->RAngleLoc,
1432 /*IsCtorOrDtorName*/ false, IsClassName);
1433 // Create the new "type" annotation token.
1434 Tok.setKind(tok::annot_typename);
1435 setTypeAnnotation(Tok, Type);
1436 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1437 Tok.setLocation(SS.getBeginLoc());
1438 // End location stays the same
1439
1440 // Replace the template-id annotation token, and possible the scope-specifier
1441 // that precedes it, with the typename annotation token.
1442 PP.AnnotateCachedTokens(Tok);
1443}
1444
1445/// Determine whether the given token can end a template argument.
1446static bool isEndOfTemplateArgument(Token Tok) {
1447 // FIXME: Handle '>>>'.
1448 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
1449 tok::greatergreatergreater);
1450}
1451
1452/// Parse a C++ template template argument.
1453ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
1454 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
1455 !Tok.is(tok::annot_cxxscope))
1456 return ParsedTemplateArgument();
1457
1458 // C++0x [temp.arg.template]p1:
1459 // A template-argument for a template template-parameter shall be the name
1460 // of a class template or an alias template, expressed as id-expression.
1461 //
1462 // We parse an id-expression that refers to a class template or alias
1463 // template. The grammar we parse is:
1464 //
1465 // nested-name-specifier[opt] template[opt] identifier ...[opt]
1466 //
1467 // followed by a token that terminates a template argument, such as ',',
1468 // '>', or (in some cases) '>>'.
1469 CXXScopeSpec SS; // nested-name-specifier, if present
1470 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1471 /*ObjectHasErrors=*/false,
1472 /*EnteringContext=*/false);
1473
1474 ParsedTemplateArgument Result;
1475 SourceLocation EllipsisLoc;
1476 if (SS.isSet() && Tok.is(tok::kw_template)) {
1477 // Parse the optional 'template' keyword following the
1478 // nested-name-specifier.
1479 SourceLocation TemplateKWLoc = ConsumeToken();
1480
1481 if (Tok.is(tok::identifier)) {
1482 // We appear to have a dependent template name.
1483 UnqualifiedId Name;
1484 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1485 ConsumeToken(); // the identifier
1486
1487 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1488
1489 // If the next token signals the end of a template argument, then we have
1490 // a (possibly-dependent) template name that could be a template template
1491 // argument.
1492 TemplateTy Template;
1493 if (isEndOfTemplateArgument(Tok) &&
1494 Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
1495 /*ObjectType=*/nullptr,
1496 /*EnteringContext=*/false, Template))
1497 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1498 }
1499 } else if (Tok.is(tok::identifier)) {
1500 // We may have a (non-dependent) template name.
1501 TemplateTy Template;
1502 UnqualifiedId Name;
1503 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1504 ConsumeToken(); // the identifier
1505
1506 TryConsumeToken(tok::ellipsis, EllipsisLoc);
1507
1508 if (isEndOfTemplateArgument(Tok)) {
1509 bool MemberOfUnknownSpecialization;
1510 TemplateNameKind TNK = Actions.isTemplateName(
1511 getCurScope(), SS,
1512 /*hasTemplateKeyword=*/false, Name,
1513 /*ObjectType=*/nullptr,
1514 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
1515 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
1516 // We have an id-expression that refers to a class template or
1517 // (C++0x) alias template.
1518 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
1519 }
1520 }
1521 }
1522
1523 // If this is a pack expansion, build it as such.
1524 if (EllipsisLoc.isValid() && !Result.isInvalid())
1525 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
1526
1527 return Result;
1528}
1529
1530/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
1531///
1532/// template-argument: [C++ 14.2]
1533/// constant-expression
1534/// type-id
1535/// id-expression
1536ParsedTemplateArgument Parser::ParseTemplateArgument() {
1537 // C++ [temp.arg]p2:
1538 // In a template-argument, an ambiguity between a type-id and an
1539 // expression is resolved to a type-id, regardless of the form of
1540 // the corresponding template-parameter.
1541 //
1542 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
1543 // up and annotate an identifier as an id-expression during disambiguation,
1544 // so enter the appropriate context for a constant expression template
1545 // argument before trying to disambiguate.
1546
1547 EnterExpressionEvaluationContext EnterConstantEvaluated(
1548 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
1549 /*LambdaContextDecl=*/nullptr,
1550 /*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
1551 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
1552 TypeResult TypeArg = ParseTypeName(
1553 /*Range=*/nullptr, DeclaratorContext::TemplateArg);
1554 return Actions.ActOnTemplateTypeArgument(TypeArg);
1555 }
1556
1557 // Try to parse a template template argument.
1558 {
1559 TentativeParsingAction TPA(*this);
1560
1561 ParsedTemplateArgument TemplateTemplateArgument
1562 = ParseTemplateTemplateArgument();
1563 if (!TemplateTemplateArgument.isInvalid()) {
1564 TPA.Commit();
1565 return TemplateTemplateArgument;
1566 }
1567
1568 // Revert this tentative parse to parse a non-type template argument.
1569 TPA.Revert();
1570 }
1571
1572 // Parse a non-type template argument.
1573 SourceLocation Loc = Tok.getLocation();
1574 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
1575 if (ExprArg.isInvalid() || !ExprArg.get()) {
1576 return ParsedTemplateArgument();
1577 }
1578
1579 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
1580 ExprArg.get(), Loc);
1581}
1582
1583/// ParseTemplateArgumentList - Parse a C++ template-argument-list
1584/// (C++ [temp.names]). Returns true if there was an error.
1585///
1586/// template-argument-list: [C++ 14.2]
1587/// template-argument
1588/// template-argument-list ',' template-argument
1589///
1590/// \param Template is only used for code completion, and may be null.
1591bool Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs,
1592 TemplateTy Template,
1593 SourceLocation OpenLoc) {
1594
1595 ColonProtectionRAIIObject ColonProtection(*this, false);
1596
1597 auto RunSignatureHelp = [&] {
1598 if (!Template)
1599 return QualType();
1600 CalledSignatureHelp = true;
1601 return Actions.ProduceTemplateArgumentSignatureHelp(Template, TemplateArgs,
1602 OpenLoc);
1603 };
1604
1605 do {
1606 PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp);
1607 ParsedTemplateArgument Arg = ParseTemplateArgument();
1608 SourceLocation EllipsisLoc;
1609 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
1610 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
1611
1612 if (Arg.isInvalid()) {
1613 if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
1614 RunSignatureHelp();
1615 return true;
1616 }
1617
1618 // Save this template argument.
1619 TemplateArgs.push_back(Arg);
1620
1621 // If the next token is a comma, consume it and keep reading
1622 // arguments.
1623 } while (TryConsumeToken(tok::comma));
1624
1625 return false;
1626}
1627
1628/// Parse a C++ explicit template instantiation
1629/// (C++ [temp.explicit]).
1630///
1631/// explicit-instantiation:
1632/// 'extern' [opt] 'template' declaration
1633///
1634/// Note that the 'extern' is a GNU extension and C++11 feature.
1635Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
1636 SourceLocation ExternLoc,
1637 SourceLocation TemplateLoc,
1638 SourceLocation &DeclEnd,
1639 ParsedAttributes &AccessAttrs,
1640 AccessSpecifier AS) {
1641 // This isn't really required here.
1642 ParsingDeclRAIIObject
1643 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
1644
1645 return ParseSingleDeclarationAfterTemplate(
1646 Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
1647 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
1648}
1649
1650SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
1651 if (TemplateParams)
1652 return getTemplateParamsRange(TemplateParams->data(),
1653 TemplateParams->size());
1654
1655 SourceRange R(TemplateLoc);
1656 if (ExternLoc.isValid())
1657 R.setBegin(ExternLoc);
1658 return R;
1659}
1660
1661void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
1662 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
1
Calling 'Parser::ParseLateTemplatedFuncDef'
1663}
1664
1665/// Late parse a C++ function template in Microsoft mode.
1666void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
1667 if (!LPT.D)
2
Assuming field 'D' is non-null
3
Taking false branch
1668 return;
1669
1670 // Destroy TemplateIdAnnotations when we're done, if possible.
1671 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
1672
1673 // Get the FunctionDecl.
1674 FunctionDecl *FunD = LPT.D->getAsFunction();
4
'FunD' initialized here
1675 // Track template parameter depth.
1676 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1677
1678 // To restore the context after late parsing.
1679 Sema::ContextRAII GlobalSavedContext(
1680 Actions, Actions.Context.getTranslationUnitDecl());
1681
1682 MultiParseScope Scopes(*this);
1683
1684 // Get the list of DeclContexts to reenter.
1685 SmallVector<DeclContext*, 4> DeclContextsToReenter;
1686 for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
5
Assuming 'DC' is null
6
Assuming pointer value is null
1687 DC = DC->getLexicalParent())
1688 DeclContextsToReenter.push_back(DC);
1689
1690 // Reenter scopes from outermost to innermost.
1691 for (DeclContext *DC : reverse(DeclContextsToReenter)) {
1692 CurTemplateDepthTracker.addDepth(
1693 ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
1694 Scopes.Enter(Scope::DeclScope);
1695 // We'll reenter the function context itself below.
1696 if (DC != FunD)
1697 Actions.PushDeclContext(Actions.getCurScope(), DC);
1698 }
1699
1700 assert(!LPT.Toks.empty() && "Empty body!")(static_cast <bool> (!LPT.Toks.empty() && "Empty body!"
) ? void (0) : __assert_fail ("!LPT.Toks.empty() && \"Empty body!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1700, __extension__ __PRETTY_FUNCTION__
))
;
7
'?' condition is true
1701
1702 // Append the current token at the end of the new token stream so that it
1703 // doesn't get lost.
1704 LPT.Toks.push_back(Tok);
1705 PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
1706
1707 // Consume the previously pushed token.
1708 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
1709 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&(static_cast <bool> (Tok.isOneOf(tok::l_brace, tok::colon
, tok::kw_try) && "Inline method not starting with '{', ':' or 'try'"
) ? void (0) : __assert_fail ("Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) && \"Inline method not starting with '{', ':' or 'try'\""
, "clang/lib/Parse/ParseTemplate.cpp", 1710, __extension__ __PRETTY_FUNCTION__
))
8
'?' condition is true
1710 "Inline method not starting with '{', ':' or 'try'")(static_cast <bool> (Tok.isOneOf(tok::l_brace, tok::colon
, tok::kw_try) && "Inline method not starting with '{', ':' or 'try'"
) ? void (0) : __assert_fail ("Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) && \"Inline method not starting with '{', ':' or 'try'\""
, "clang/lib/Parse/ParseTemplate.cpp", 1710, __extension__ __PRETTY_FUNCTION__
))
;
1711
1712 // Parse the method body. Function body parsing code is similar enough
1713 // to be re-used for method bodies as well.
1714 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
1715 Scope::CompoundStmtScope);
1716
1717 // Recreate the containing function DeclContext.
1718 Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
9
Called C++ object pointer is null
1719
1720 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
1721
1722 if (Tok.is(tok::kw_try)) {
1723 ParseFunctionTryBlock(LPT.D, FnScope);
1724 } else {
1725 if (Tok.is(tok::colon))
1726 ParseConstructorInitializer(LPT.D);
1727 else
1728 Actions.ActOnDefaultCtorInitializers(LPT.D);
1729
1730 if (Tok.is(tok::l_brace)) {
1731 assert((!isa<FunctionTemplateDecl>(LPT.D) ||(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
1732 cast<FunctionTemplateDecl>(LPT.D)(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
1733 ->getTemplateParameters()(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
1734 ->getDepth() == TemplateParameterDepth - 1) &&(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
1735 "TemplateParameterDepth should be greater than the depth of "(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
1736 "current template being instantiated!")(static_cast <bool> ((!isa<FunctionTemplateDecl>(
LPT.D) || cast<FunctionTemplateDecl>(LPT.D) ->getTemplateParameters
() ->getDepth() == TemplateParameterDepth - 1) && "TemplateParameterDepth should be greater than the depth of "
"current template being instantiated!") ? 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!\""
, "clang/lib/Parse/ParseTemplate.cpp", 1736, __extension__ __PRETTY_FUNCTION__
))
;
1737 ParseFunctionStatementBody(LPT.D, FnScope);
1738 Actions.UnmarkAsLateParsedTemplate(FunD);
1739 } else
1740 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
1741 }
1742}
1743
1744/// Lex a delayed template function for late parsing.
1745void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
1746 tok::TokenKind kind = Tok.getKind();
1747 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
1748 // Consume everything up to (and including) the matching right brace.
1749 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1750 }
1751
1752 // If we're in a function-try-block, we need to store all the catch blocks.
1753 if (kind == tok::kw_try) {
1754 while (Tok.is(tok::kw_catch)) {
1755 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
1756 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
1757 }
1758 }
1759}
1760
1761/// We've parsed something that could plausibly be intended to be a template
1762/// name (\p LHS) followed by a '<' token, and the following code can't possibly
1763/// be an expression. Determine if this is likely to be a template-id and if so,
1764/// diagnose it.
1765bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
1766 TentativeParsingAction TPA(*this);
1767 // FIXME: We could look at the token sequence in a lot more detail here.
1768 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
1769 StopAtSemi | StopBeforeMatch)) {
1770 TPA.Commit();
1771
1772 SourceLocation Greater;
1773 ParseGreaterThanInTemplateList(Less, Greater, true, false);
1774 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
1775 Less, Greater);
1776 return true;
1777 }
1778
1779 // There's no matching '>' token, this probably isn't supposed to be
1780 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
1781 TPA.Revert();
1782 return false;
1783}
1784
1785void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
1786 assert(Tok.is(tok::less) && "not at a potential angle bracket")(static_cast <bool> (Tok.is(tok::less) && "not at a potential angle bracket"
) ? void (0) : __assert_fail ("Tok.is(tok::less) && \"not at a potential angle bracket\""
, "clang/lib/Parse/ParseTemplate.cpp", 1786, __extension__ __PRETTY_FUNCTION__
))
;
1787
1788 bool DependentTemplateName = false;
1789 if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
1790 DependentTemplateName))
1791 return;
1792
1793 // OK, this might be a name that the user intended to be parsed as a
1794 // template-name, followed by a '<' token. Check for some easy cases.
1795
1796 // If we have potential_template<>, then it's supposed to be a template-name.
1797 if (NextToken().is(tok::greater) ||
1798 (getLangOpts().CPlusPlus11 &&
1799 NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
1800 SourceLocation Less = ConsumeToken();
1801 SourceLocation Greater;
1802 ParseGreaterThanInTemplateList(Less, Greater, true, false);
1803 Actions.diagnoseExprIntendedAsTemplateName(
1804 getCurScope(), PotentialTemplateName, Less, Greater);
1805 // FIXME: Perform error recovery.
1806 PotentialTemplateName = ExprError();
1807 return;
1808 }
1809
1810 // If we have 'potential_template<type-id', assume it's supposed to be a
1811 // template-name if there's a matching '>' later on.
1812 {
1813 // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
1814 TentativeParsingAction TPA(*this);
1815 SourceLocation Less = ConsumeToken();
1816 if (isTypeIdUnambiguously() &&
1817 diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
1818 TPA.Commit();
1819 // FIXME: Perform error recovery.
1820 PotentialTemplateName = ExprError();
1821 return;
1822 }
1823 TPA.Revert();
1824 }
1825
1826 // Otherwise, remember that we saw this in case we see a potentially-matching
1827 // '>' token later on.
1828 AngleBracketTracker::Priority Priority =
1829 (DependentTemplateName ? AngleBracketTracker::DependentName
1830 : AngleBracketTracker::PotentialTypo) |
1831 (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
1832 : AngleBracketTracker::NoSpaceBeforeLess);
1833 AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
1834 Priority);
1835}
1836
1837bool Parser::checkPotentialAngleBracketDelimiter(
1838 const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
1839 // If a comma in an expression context is followed by a type that can be a
1840 // template argument and cannot be an expression, then this is ill-formed,
1841 // but might be intended to be part of a template-id.
1842 if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
1843 diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
1844 AngleBrackets.clear(*this);
1845 return true;
1846 }
1847
1848 // If a context that looks like a template-id is followed by '()', then
1849 // this is ill-formed, but might be intended to be a template-id
1850 // followed by '()'.
1851 if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
1852 NextToken().is(tok::r_paren)) {
1853 Actions.diagnoseExprIntendedAsTemplateName(
1854 getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
1855 OpToken.getLocation());
1856 AngleBrackets.clear(*this);
1857 return true;
1858 }
1859
1860 // After a '>' (etc), we're no longer potentially in a construct that's
1861 // intended to be treated as a template-id.
1862 if (OpToken.is(tok::greater) ||
1863 (getLangOpts().CPlusPlus11 &&
1864 OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
1865 AngleBrackets.clear(*this);
1866 return false;
1867}