Bug Summary

File:tools/clang/include/clang/AST/DeclTemplate.h
Warning:line 2659, column 31
Access to field 'PartialSpecialization' results in a dereference of a null pointer (loaded from variable 'PS')

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaTemplate.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 -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-8/lib/clang/8.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/include -I /build/llvm-toolchain-snapshot-8~svn345461/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/include/clang/8.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-8/lib/clang/8.0.0/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++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-10-27-211344-32123-1 -x c++ /build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp -faddrsig

/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp

1//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for C++ templates.
10//===----------------------------------------------------------------------===//
11
12#include "TreeTransform.h"
13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/DeclFriend.h"
16#include "clang/AST/DeclTemplate.h"
17#include "clang/AST/Expr.h"
18#include "clang/AST/ExprCXX.h"
19#include "clang/AST/RecursiveASTVisitor.h"
20#include "clang/AST/TypeVisitor.h"
21#include "clang/Basic/Builtins.h"
22#include "clang/Basic/LangOptions.h"
23#include "clang/Basic/PartialDiagnostic.h"
24#include "clang/Basic/TargetInfo.h"
25#include "clang/Sema/DeclSpec.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/ParsedTemplate.h"
28#include "clang/Sema/Scope.h"
29#include "clang/Sema/SemaInternal.h"
30#include "clang/Sema/Template.h"
31#include "clang/Sema/TemplateDeduction.h"
32#include "llvm/ADT/SmallBitVector.h"
33#include "llvm/ADT/SmallString.h"
34#include "llvm/ADT/StringExtras.h"
35
36#include <iterator>
37using namespace clang;
38using namespace sema;
39
40// Exported for use by Parser.
41SourceRange
42clang::getTemplateParamsRange(TemplateParameterList const * const *Ps,
43 unsigned N) {
44 if (!N) return SourceRange();
45 return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc());
46}
47
48namespace clang {
49/// [temp.constr.decl]p2: A template's associated constraints are
50/// defined as a single constraint-expression derived from the introduced
51/// constraint-expressions [ ... ].
52///
53/// \param Params The template parameter list and optional requires-clause.
54///
55/// \param FD The underlying templated function declaration for a function
56/// template.
57static Expr *formAssociatedConstraints(TemplateParameterList *Params,
58 FunctionDecl *FD);
59}
60
61static Expr *clang::formAssociatedConstraints(TemplateParameterList *Params,
62 FunctionDecl *FD) {
63 // FIXME: Concepts: collect additional introduced constraint-expressions
64 assert(!FD && "Cannot collect constraints from function declaration yet.")((!FD && "Cannot collect constraints from function declaration yet."
) ? static_cast<void> (0) : __assert_fail ("!FD && \"Cannot collect constraints from function declaration yet.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 64, __PRETTY_FUNCTION__))
;
65 return Params->getRequiresClause();
66}
67
68/// Determine whether the declaration found is acceptable as the name
69/// of a template and, if so, return that template declaration. Otherwise,
70/// returns NULL.
71static NamedDecl *isAcceptableTemplateName(ASTContext &Context,
72 NamedDecl *Orig,
73 bool AllowFunctionTemplates) {
74 NamedDecl *D = Orig->getUnderlyingDecl();
75
76 if (isa<TemplateDecl>(D)) {
77 if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D))
78 return nullptr;
79
80 return Orig;
81 }
82
83 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
84 // C++ [temp.local]p1:
85 // Like normal (non-template) classes, class templates have an
86 // injected-class-name (Clause 9). The injected-class-name
87 // can be used with or without a template-argument-list. When
88 // it is used without a template-argument-list, it is
89 // equivalent to the injected-class-name followed by the
90 // template-parameters of the class template enclosed in
91 // <>. When it is used with a template-argument-list, it
92 // refers to the specified class template specialization,
93 // which could be the current specialization or another
94 // specialization.
95 if (Record->isInjectedClassName()) {
96 Record = cast<CXXRecordDecl>(Record->getDeclContext());
97 if (Record->getDescribedClassTemplate())
98 return Record->getDescribedClassTemplate();
99
100 if (ClassTemplateSpecializationDecl *Spec
101 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
102 return Spec->getSpecializedTemplate();
103 }
104
105 return nullptr;
106 }
107
108 // 'using Dependent::foo;' can resolve to a template name.
109 // 'using typename Dependent::foo;' cannot (not even if 'foo' is an
110 // injected-class-name).
111 if (isa<UnresolvedUsingValueDecl>(D))
112 return D;
113
114 return nullptr;
115}
116
117void Sema::FilterAcceptableTemplateNames(LookupResult &R,
118 bool AllowFunctionTemplates) {
119 // The set of class templates we've already seen.
120 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
121 LookupResult::Filter filter = R.makeFilter();
122 while (filter.hasNext()) {
123 NamedDecl *Orig = filter.next();
124 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig,
125 AllowFunctionTemplates);
126 if (!Repl)
127 filter.erase();
128 else if (Repl != Orig) {
129
130 // C++ [temp.local]p3:
131 // A lookup that finds an injected-class-name (10.2) can result in an
132 // ambiguity in certain cases (for example, if it is found in more than
133 // one base class). If all of the injected-class-names that are found
134 // refer to specializations of the same class template, and if the name
135 // is used as a template-name, the reference refers to the class
136 // template itself and not a specialization thereof, and is not
137 // ambiguous.
138 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
139 if (!ClassTemplates.insert(ClassTmpl).second) {
140 filter.erase();
141 continue;
142 }
143
144 // FIXME: we promote access to public here as a workaround to
145 // the fact that LookupResult doesn't let us remember that we
146 // found this template through a particular injected class name,
147 // which means we end up doing nasty things to the invariants.
148 // Pretending that access is public is *much* safer.
149 filter.replace(Repl, AS_public);
150 }
151 }
152 filter.done();
153}
154
155bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
156 bool AllowFunctionTemplates) {
157 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
158 if (isAcceptableTemplateName(Context, *I, AllowFunctionTemplates))
159 return true;
160
161 return false;
162}
163
164TemplateNameKind Sema::isTemplateName(Scope *S,
165 CXXScopeSpec &SS,
166 bool hasTemplateKeyword,
167 const UnqualifiedId &Name,
168 ParsedType ObjectTypePtr,
169 bool EnteringContext,
170 TemplateTy &TemplateResult,
171 bool &MemberOfUnknownSpecialization) {
172 assert(getLangOpts().CPlusPlus && "No template names in C!")((getLangOpts().CPlusPlus && "No template names in C!"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 172, __PRETTY_FUNCTION__))
;
173
174 DeclarationName TName;
175 MemberOfUnknownSpecialization = false;
176
177 switch (Name.getKind()) {
178 case UnqualifiedIdKind::IK_Identifier:
179 TName = DeclarationName(Name.Identifier);
180 break;
181
182 case UnqualifiedIdKind::IK_OperatorFunctionId:
183 TName = Context.DeclarationNames.getCXXOperatorName(
184 Name.OperatorFunctionId.Operator);
185 break;
186
187 case UnqualifiedIdKind::IK_LiteralOperatorId:
188 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
189 break;
190
191 default:
192 return TNK_Non_template;
193 }
194
195 QualType ObjectType = ObjectTypePtr.get();
196
197 LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName);
198 if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
199 MemberOfUnknownSpecialization))
200 return TNK_Non_template;
201 if (R.empty()) return TNK_Non_template;
202 if (R.isAmbiguous()) {
203 // Suppress diagnostics; we'll redo this lookup later.
204 R.suppressDiagnostics();
205
206 // FIXME: we might have ambiguous templates, in which case we
207 // should at least parse them properly!
208 return TNK_Non_template;
209 }
210
211 TemplateName Template;
212 TemplateNameKind TemplateKind;
213
214 unsigned ResultCount = R.end() - R.begin();
215 if (ResultCount > 1) {
216 // We assume that we'll preserve the qualifier from a function
217 // template name in other ways.
218 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
219 TemplateKind = TNK_Function_template;
220
221 // We'll do this lookup again later.
222 R.suppressDiagnostics();
223 } else if (isa<UnresolvedUsingValueDecl>((*R.begin())->getUnderlyingDecl())) {
224 // We don't yet know whether this is a template-name or not.
225 MemberOfUnknownSpecialization = true;
226 return TNK_Non_template;
227 } else {
228 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
229
230 if (SS.isSet() && !SS.isInvalid()) {
231 NestedNameSpecifier *Qualifier = SS.getScopeRep();
232 Template = Context.getQualifiedTemplateName(Qualifier,
233 hasTemplateKeyword, TD);
234 } else {
235 Template = TemplateName(TD);
236 }
237
238 if (isa<FunctionTemplateDecl>(TD)) {
239 TemplateKind = TNK_Function_template;
240
241 // We'll do this lookup again later.
242 R.suppressDiagnostics();
243 } else {
244 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast
<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __PRETTY_FUNCTION__))
245 isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast
<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __PRETTY_FUNCTION__))
246 isa<BuiltinTemplateDecl>(TD))((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast
<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __PRETTY_FUNCTION__))
;
247 TemplateKind =
248 isa<VarTemplateDecl>(TD) ? TNK_Var_template : TNK_Type_template;
249 }
250 }
251
252 TemplateResult = TemplateTy::make(Template);
253 return TemplateKind;
254}
255
256bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
257 SourceLocation NameLoc,
258 ParsedTemplateTy *Template) {
259 CXXScopeSpec SS;
260 bool MemberOfUnknownSpecialization = false;
261
262 // We could use redeclaration lookup here, but we don't need to: the
263 // syntactic form of a deduction guide is enough to identify it even
264 // if we can't look up the template name at all.
265 LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName);
266 if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(),
267 /*EnteringContext*/ false,
268 MemberOfUnknownSpecialization))
269 return false;
270
271 if (R.empty()) return false;
272 if (R.isAmbiguous()) {
273 // FIXME: Diagnose an ambiguity if we find at least one template.
274 R.suppressDiagnostics();
275 return false;
276 }
277
278 // We only treat template-names that name type templates as valid deduction
279 // guide names.
280 TemplateDecl *TD = R.getAsSingle<TemplateDecl>();
281 if (!TD || !getAsTypeTemplateDecl(TD))
282 return false;
283
284 if (Template)
285 *Template = TemplateTy::make(TemplateName(TD));
286 return true;
287}
288
289bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
290 SourceLocation IILoc,
291 Scope *S,
292 const CXXScopeSpec *SS,
293 TemplateTy &SuggestedTemplate,
294 TemplateNameKind &SuggestedKind) {
295 // We can't recover unless there's a dependent scope specifier preceding the
296 // template name.
297 // FIXME: Typo correction?
298 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
299 computeDeclContext(*SS))
300 return false;
301
302 // The code is missing a 'template' keyword prior to the dependent template
303 // name.
304 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
305 Diag(IILoc, diag::err_template_kw_missing)
306 << Qualifier << II.getName()
307 << FixItHint::CreateInsertion(IILoc, "template ");
308 SuggestedTemplate
309 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
310 SuggestedKind = TNK_Dependent_template_name;
311 return true;
312}
313
314bool Sema::LookupTemplateName(LookupResult &Found,
315 Scope *S, CXXScopeSpec &SS,
316 QualType ObjectType,
317 bool EnteringContext,
318 bool &MemberOfUnknownSpecialization,
319 SourceLocation TemplateKWLoc) {
320 // Determine where to perform name lookup
321 MemberOfUnknownSpecialization = false;
322 DeclContext *LookupCtx = nullptr;
323 bool IsDependent = false;
324 if (!ObjectType.isNull()) {
325 // This nested-name-specifier occurs in a member access expression, e.g.,
326 // x->B::f, and we are looking into the type of the object.
327 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist")((!SS.isSet() && "ObjectType and scope specifier cannot coexist"
) ? static_cast<void> (0) : __assert_fail ("!SS.isSet() && \"ObjectType and scope specifier cannot coexist\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 327, __PRETTY_FUNCTION__))
;
328 LookupCtx = computeDeclContext(ObjectType);
329 IsDependent = !LookupCtx;
330 assert((IsDependent || !ObjectType->isIncompleteType() ||(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __PRETTY_FUNCTION__))
331 ObjectType->castAs<TagType>()->isBeingDefined()) &&(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __PRETTY_FUNCTION__))
332 "Caller should have completed object type")(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __PRETTY_FUNCTION__))
;
333
334 // Template names cannot appear inside an Objective-C class or object type.
335 if (ObjectType->isObjCObjectOrInterfaceType()) {
336 Found.clear();
337 return false;
338 }
339 } else if (SS.isSet()) {
340 // This nested-name-specifier occurs after another nested-name-specifier,
341 // so long into the context associated with the prior nested-name-specifier.
342 LookupCtx = computeDeclContext(SS, EnteringContext);
343 IsDependent = !LookupCtx;
344
345 // The declaration context must be complete.
346 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
347 return true;
348 }
349
350 bool ObjectTypeSearchedInScope = false;
351 bool AllowFunctionTemplatesInLookup = true;
352 if (LookupCtx) {
353 // Perform "qualified" name lookup into the declaration context we
354 // computed, which is either the type of the base of a member access
355 // expression or the declaration context associated with a prior
356 // nested-name-specifier.
357 LookupQualifiedName(Found, LookupCtx);
358
359 // FIXME: The C++ standard does not clearly specify what happens in the
360 // case where the object type is dependent, and implementations vary. In
361 // Clang, we treat a name after a . or -> as a template-name if lookup
362 // finds a non-dependent member or member of the current instantiation that
363 // is a type template, or finds no such members and lookup in the context
364 // of the postfix-expression finds a type template. In the latter case, the
365 // name is nonetheless dependent, and we may resolve it to a member of an
366 // unknown specialization when we come to instantiate the template.
367 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
368 }
369
370 if (!SS.isSet() && (ObjectType.isNull() || Found.empty())) {
371 // C++ [basic.lookup.classref]p1:
372 // In a class member access expression (5.2.5), if the . or -> token is
373 // immediately followed by an identifier followed by a <, the
374 // identifier must be looked up to determine whether the < is the
375 // beginning of a template argument list (14.2) or a less-than operator.
376 // The identifier is first looked up in the class of the object
377 // expression. If the identifier is not found, it is then looked up in
378 // the context of the entire postfix-expression and shall name a class
379 // template.
380 if (S)
381 LookupName(Found, S);
382
383 if (!ObjectType.isNull()) {
384 // FIXME: We should filter out all non-type templates here, particularly
385 // variable templates and concepts. But the exclusion of alias templates
386 // and template template parameters is a wording defect.
387 AllowFunctionTemplatesInLookup = false;
388 ObjectTypeSearchedInScope = true;
389 }
390
391 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
392 }
393
394 if (Found.empty() && !IsDependent) {
395 // If we did not find any names, attempt to correct any typos.
396 DeclarationName Name = Found.getLookupName();
397 Found.clear();
398 // Simple filter callback that, for keywords, only accepts the C++ *_cast
399 auto FilterCCC = llvm::make_unique<CorrectionCandidateCallback>();
400 FilterCCC->WantTypeSpecifiers = false;
401 FilterCCC->WantExpressionKeywords = false;
402 FilterCCC->WantRemainingKeywords = false;
403 FilterCCC->WantCXXNamedCasts = true;
404 if (TypoCorrection Corrected = CorrectTypo(
405 Found.getLookupNameInfo(), Found.getLookupKind(), S, &SS,
406 std::move(FilterCCC), CTK_ErrorRecovery, LookupCtx)) {
407 Found.setLookupName(Corrected.getCorrection());
408 if (auto *ND = Corrected.getFoundDecl())
409 Found.addDecl(ND);
410 FilterAcceptableTemplateNames(Found);
411 if (!Found.empty()) {
412 if (LookupCtx) {
413 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
414 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
415 Name.getAsString() == CorrectedStr;
416 diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest)
417 << Name << LookupCtx << DroppedSpecifier
418 << SS.getRange());
419 } else {
420 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name);
421 }
422 }
423 } else {
424 Found.setLookupName(Name);
425 }
426 }
427
428 NamedDecl *ExampleLookupResult =
429 Found.empty() ? nullptr : Found.getRepresentativeDecl();
430 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
431 if (Found.empty()) {
432 if (IsDependent) {
433 MemberOfUnknownSpecialization = true;
434 return false;
435 }
436
437 // If a 'template' keyword was used, a lookup that finds only non-template
438 // names is an error.
439 if (ExampleLookupResult && TemplateKWLoc.isValid()) {
440 Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template)
441 << Found.getLookupName() << SS.getRange();
442 Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(),
443 diag::note_template_kw_refers_to_non_template)
444 << Found.getLookupName();
445 return true;
446 }
447
448 return false;
449 }
450
451 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
452 !getLangOpts().CPlusPlus11) {
453 // C++03 [basic.lookup.classref]p1:
454 // [...] If the lookup in the class of the object expression finds a
455 // template, the name is also looked up in the context of the entire
456 // postfix-expression and [...]
457 //
458 // Note: C++11 does not perform this second lookup.
459 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
460 LookupOrdinaryName);
461 LookupName(FoundOuter, S);
462 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
463
464 if (FoundOuter.empty()) {
465 // - if the name is not found, the name found in the class of the
466 // object expression is used, otherwise
467 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
468 FoundOuter.isAmbiguous()) {
469 // - if the name is found in the context of the entire
470 // postfix-expression and does not name a class template, the name
471 // found in the class of the object expression is used, otherwise
472 FoundOuter.clear();
473 } else if (!Found.isSuppressingDiagnostics()) {
474 // - if the name found is a class template, it must refer to the same
475 // entity as the one found in the class of the object expression,
476 // otherwise the program is ill-formed.
477 if (!Found.isSingleResult() ||
478 Found.getFoundDecl()->getCanonicalDecl()
479 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
480 Diag(Found.getNameLoc(),
481 diag::ext_nested_name_member_ref_lookup_ambiguous)
482 << Found.getLookupName()
483 << ObjectType;
484 Diag(Found.getRepresentativeDecl()->getLocation(),
485 diag::note_ambig_member_ref_object_type)
486 << ObjectType;
487 Diag(FoundOuter.getFoundDecl()->getLocation(),
488 diag::note_ambig_member_ref_scope);
489
490 // Recover by taking the template that we found in the object
491 // expression's type.
492 }
493 }
494 }
495
496 return false;
497}
498
499void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
500 SourceLocation Less,
501 SourceLocation Greater) {
502 if (TemplateName.isInvalid())
503 return;
504
505 DeclarationNameInfo NameInfo;
506 CXXScopeSpec SS;
507 LookupNameKind LookupKind;
508
509 DeclContext *LookupCtx = nullptr;
510 NamedDecl *Found = nullptr;
511 bool MissingTemplateKeyword = false;
512
513 // Figure out what name we looked up.
514 if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) {
515 NameInfo = DRE->getNameInfo();
516 SS.Adopt(DRE->getQualifierLoc());
517 LookupKind = LookupOrdinaryName;
518 Found = DRE->getFoundDecl();
519 } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) {
520 NameInfo = ME->getMemberNameInfo();
521 SS.Adopt(ME->getQualifierLoc());
522 LookupKind = LookupMemberName;
523 LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl();
524 Found = ME->getMemberDecl();
525 } else if (auto *DSDRE =
526 dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) {
527 NameInfo = DSDRE->getNameInfo();
528 SS.Adopt(DSDRE->getQualifierLoc());
529 MissingTemplateKeyword = true;
530 } else if (auto *DSME =
531 dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) {
532 NameInfo = DSME->getMemberNameInfo();
533 SS.Adopt(DSME->getQualifierLoc());
534 MissingTemplateKeyword = true;
535 } else {
536 llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 536)
;
537 }
538
539 // If this is a dependent-scope lookup, diagnose that the 'template' keyword
540 // was missing.
541 if (MissingTemplateKeyword) {
542 Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing)
543 << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater);
544 return;
545 }
546
547 // Try to correct the name by looking for templates and C++ named casts.
548 struct TemplateCandidateFilter : CorrectionCandidateCallback {
549 TemplateCandidateFilter() {
550 WantTypeSpecifiers = false;
551 WantExpressionKeywords = false;
552 WantRemainingKeywords = false;
553 WantCXXNamedCasts = true;
554 };
555 bool ValidateCandidate(const TypoCorrection &Candidate) override {
556 if (auto *ND = Candidate.getCorrectionDecl())
557 return isAcceptableTemplateName(ND->getASTContext(), ND, true);
558 return Candidate.isKeyword();
559 }
560 };
561
562 DeclarationName Name = NameInfo.getName();
563 if (TypoCorrection Corrected =
564 CorrectTypo(NameInfo, LookupKind, S, &SS,
565 llvm::make_unique<TemplateCandidateFilter>(),
566 CTK_ErrorRecovery, LookupCtx)) {
567 auto *ND = Corrected.getFoundDecl();
568 if (ND)
569 ND = isAcceptableTemplateName(Context, ND,
570 /*AllowFunctionTemplates*/ true);
571 if (ND || Corrected.isKeyword()) {
572 if (LookupCtx) {
573 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
574 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
575 Name.getAsString() == CorrectedStr;
576 diagnoseTypo(Corrected,
577 PDiag(diag::err_non_template_in_member_template_id_suggest)
578 << Name << LookupCtx << DroppedSpecifier
579 << SS.getRange(), false);
580 } else {
581 diagnoseTypo(Corrected,
582 PDiag(diag::err_non_template_in_template_id_suggest)
583 << Name, false);
584 }
585 if (Found)
586 Diag(Found->getLocation(),
587 diag::note_non_template_in_template_id_found);
588 return;
589 }
590 }
591
592 Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id)
593 << Name << SourceRange(Less, Greater);
594 if (Found)
595 Diag(Found->getLocation(), diag::note_non_template_in_template_id_found);
596}
597
598/// ActOnDependentIdExpression - Handle a dependent id-expression that
599/// was just parsed. This is only possible with an explicit scope
600/// specifier naming a dependent type.
601ExprResult
602Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
603 SourceLocation TemplateKWLoc,
604 const DeclarationNameInfo &NameInfo,
605 bool isAddressOfOperand,
606 const TemplateArgumentListInfo *TemplateArgs) {
607 DeclContext *DC = getFunctionLevelDeclContext();
608
609 // C++11 [expr.prim.general]p12:
610 // An id-expression that denotes a non-static data member or non-static
611 // member function of a class can only be used:
612 // (...)
613 // - if that id-expression denotes a non-static data member and it
614 // appears in an unevaluated operand.
615 //
616 // If this might be the case, form a DependentScopeDeclRefExpr instead of a
617 // CXXDependentScopeMemberExpr. The former can instantiate to either
618 // DeclRefExpr or MemberExpr depending on lookup results, while the latter is
619 // always a MemberExpr.
620 bool MightBeCxx11UnevalField =
621 getLangOpts().CPlusPlus11 && isUnevaluatedContext();
622
623 // Check if the nested name specifier is an enum type.
624 bool IsEnum = false;
625 if (NestedNameSpecifier *NNS = SS.getScopeRep())
626 IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType());
627
628 if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
629 isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) {
630 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
631
632 // Since the 'this' expression is synthesized, we don't need to
633 // perform the double-lookup check.
634 NamedDecl *FirstQualifierInScope = nullptr;
635
636 return CXXDependentScopeMemberExpr::Create(
637 Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true,
638 /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc,
639 FirstQualifierInScope, NameInfo, TemplateArgs);
640 }
641
642 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
643}
644
645ExprResult
646Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
647 SourceLocation TemplateKWLoc,
648 const DeclarationNameInfo &NameInfo,
649 const TemplateArgumentListInfo *TemplateArgs) {
650 return DependentScopeDeclRefExpr::Create(
651 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
652 TemplateArgs);
653}
654
655
656/// Determine whether we would be unable to instantiate this template (because
657/// it either has no definition, or is in the process of being instantiated).
658bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
659 NamedDecl *Instantiation,
660 bool InstantiatedFromMember,
661 const NamedDecl *Pattern,
662 const NamedDecl *PatternDef,
663 TemplateSpecializationKind TSK,
664 bool Complain /*= true*/) {
665 assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||((isa<TagDecl>(Instantiation) || isa<FunctionDecl>
(Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast
<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 666, __PRETTY_FUNCTION__))
666 isa<VarDecl>(Instantiation))((isa<TagDecl>(Instantiation) || isa<FunctionDecl>
(Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast
<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 666, __PRETTY_FUNCTION__))
;
667
668 bool IsEntityBeingDefined = false;
669 if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef))
670 IsEntityBeingDefined = TD->isBeingDefined();
671
672 if (PatternDef && !IsEntityBeingDefined) {
673 NamedDecl *SuggestedDef = nullptr;
674 if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef,
675 /*OnlyNeedComplete*/false)) {
676 // If we're allowed to diagnose this and recover, do so.
677 bool Recover = Complain && !isSFINAEContext();
678 if (Complain)
679 diagnoseMissingImport(PointOfInstantiation, SuggestedDef,
680 Sema::MissingImportKind::Definition, Recover);
681 return !Recover;
682 }
683 return false;
684 }
685
686 if (!Complain || (PatternDef && PatternDef->isInvalidDecl()))
687 return true;
688
689 llvm::Optional<unsigned> Note;
690 QualType InstantiationTy;
691 if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation))
692 InstantiationTy = Context.getTypeDeclType(TD);
693 if (PatternDef) {
694 Diag(PointOfInstantiation,
695 diag::err_template_instantiate_within_definition)
696 << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation)
697 << InstantiationTy;
698 // Not much point in noting the template declaration here, since
699 // we're lexically inside it.
700 Instantiation->setInvalidDecl();
701 } else if (InstantiatedFromMember) {
702 if (isa<FunctionDecl>(Instantiation)) {
703 Diag(PointOfInstantiation,
704 diag::err_explicit_instantiation_undefined_member)
705 << /*member function*/ 1 << Instantiation->getDeclName()
706 << Instantiation->getDeclContext();
707 Note = diag::note_explicit_instantiation_here;
708 } else {
709 assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")((isa<TagDecl>(Instantiation) && "Must be a TagDecl!"
) ? static_cast<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 709, __PRETTY_FUNCTION__))
;
710 Diag(PointOfInstantiation,
711 diag::err_implicit_instantiate_member_undefined)
712 << InstantiationTy;
713 Note = diag::note_member_declared_at;
714 }
715 } else {
716 if (isa<FunctionDecl>(Instantiation)) {
717 Diag(PointOfInstantiation,
718 diag::err_explicit_instantiation_undefined_func_template)
719 << Pattern;
720 Note = diag::note_explicit_instantiation_here;
721 } else if (isa<TagDecl>(Instantiation)) {
722 Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
723 << (TSK != TSK_ImplicitInstantiation)
724 << InstantiationTy;
725 Note = diag::note_template_decl_here;
726 } else {
727 assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")((isa<VarDecl>(Instantiation) && "Must be a VarDecl!"
) ? static_cast<void> (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 727, __PRETTY_FUNCTION__))
;
728 if (isa<VarTemplateSpecializationDecl>(Instantiation)) {
729 Diag(PointOfInstantiation,
730 diag::err_explicit_instantiation_undefined_var_template)
731 << Instantiation;
732 Instantiation->setInvalidDecl();
733 } else
734 Diag(PointOfInstantiation,
735 diag::err_explicit_instantiation_undefined_member)
736 << /*static data member*/ 2 << Instantiation->getDeclName()
737 << Instantiation->getDeclContext();
738 Note = diag::note_explicit_instantiation_here;
739 }
740 }
741 if (Note) // Diagnostics were emitted.
742 Diag(Pattern->getLocation(), Note.getValue());
743
744 // In general, Instantiation isn't marked invalid to get more than one
745 // error for multiple undefined instantiations. But the code that does
746 // explicit declaration -> explicit definition conversion can't handle
747 // invalid declarations, so mark as invalid in that case.
748 if (TSK == TSK_ExplicitInstantiationDeclaration)
749 Instantiation->setInvalidDecl();
750 return true;
751}
752
753/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
754/// that the template parameter 'PrevDecl' is being shadowed by a new
755/// declaration at location Loc. Returns true to indicate that this is
756/// an error, and false otherwise.
757void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
758 assert(PrevDecl->isTemplateParameter() && "Not a template parameter")((PrevDecl->isTemplateParameter() && "Not a template parameter"
) ? static_cast<void> (0) : __assert_fail ("PrevDecl->isTemplateParameter() && \"Not a template parameter\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 758, __PRETTY_FUNCTION__))
;
759
760 // Microsoft Visual C++ permits template parameters to be shadowed.
761 if (getLangOpts().MicrosoftExt)
762 return;
763
764 // C++ [temp.local]p4:
765 // A template-parameter shall not be redeclared within its
766 // scope (including nested scopes).
767 Diag(Loc, diag::err_template_param_shadow)
768 << cast<NamedDecl>(PrevDecl)->getDeclName();
769 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
770}
771
772/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
773/// the parameter D to reference the templated declaration and return a pointer
774/// to the template declaration. Otherwise, do nothing to D and return null.
775TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
776 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
777 D = Temp->getTemplatedDecl();
778 return Temp;
779 }
780 return nullptr;
781}
782
783ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
784 SourceLocation EllipsisLoc) const {
785 assert(Kind == Template &&((Kind == Template && "Only template template arguments can be pack expansions here"
) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 786, __PRETTY_FUNCTION__))
786 "Only template template arguments can be pack expansions here")((Kind == Template && "Only template template arguments can be pack expansions here"
) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 786, __PRETTY_FUNCTION__))
;
787 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&((getAsTemplate().get().containsUnexpandedParameterPack() &&
"Template template argument pack expansion without packs") ?
static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 788, __PRETTY_FUNCTION__))
788 "Template template argument pack expansion without packs")((getAsTemplate().get().containsUnexpandedParameterPack() &&
"Template template argument pack expansion without packs") ?
static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 788, __PRETTY_FUNCTION__))
;
789 ParsedTemplateArgument Result(*this);
790 Result.EllipsisLoc = EllipsisLoc;
791 return Result;
792}
793
794static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
795 const ParsedTemplateArgument &Arg) {
796
797 switch (Arg.getKind()) {
798 case ParsedTemplateArgument::Type: {
799 TypeSourceInfo *DI;
800 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
801 if (!DI)
802 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
803 return TemplateArgumentLoc(TemplateArgument(T), DI);
804 }
805
806 case ParsedTemplateArgument::NonType: {
807 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
808 return TemplateArgumentLoc(TemplateArgument(E), E);
809 }
810
811 case ParsedTemplateArgument::Template: {
812 TemplateName Template = Arg.getAsTemplate().get();
813 TemplateArgument TArg;
814 if (Arg.getEllipsisLoc().isValid())
815 TArg = TemplateArgument(Template, Optional<unsigned int>());
816 else
817 TArg = Template;
818 return TemplateArgumentLoc(TArg,
819 Arg.getScopeSpec().getWithLocInContext(
820 SemaRef.Context),
821 Arg.getLocation(),
822 Arg.getEllipsisLoc());
823 }
824 }
825
826 llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 826)
;
827}
828
829/// Translates template arguments as provided by the parser
830/// into template arguments used by semantic analysis.
831void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
832 TemplateArgumentListInfo &TemplateArgs) {
833 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
834 TemplateArgs.addArgument(translateTemplateArgument(*this,
835 TemplateArgsIn[I]));
836}
837
838static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
839 SourceLocation Loc,
840 IdentifierInfo *Name) {
841 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
842 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration);
843 if (PrevDecl && PrevDecl->isTemplateParameter())
844 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
845}
846
847/// Convert a parsed type into a parsed template argument. This is mostly
848/// trivial, except that we may have parsed a C++17 deduced class template
849/// specialization type, in which case we should form a template template
850/// argument instead of a type template argument.
851ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) {
852 TypeSourceInfo *TInfo;
853 QualType T = GetTypeFromParser(ParsedType.get(), &TInfo);
854 if (T.isNull())
855 return ParsedTemplateArgument();
856 assert(TInfo && "template argument with no location")((TInfo && "template argument with no location") ? static_cast
<void> (0) : __assert_fail ("TInfo && \"template argument with no location\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 856, __PRETTY_FUNCTION__))
;
857
858 // If we might have formed a deduced template specialization type, convert
859 // it to a template template argument.
860 if (getLangOpts().CPlusPlus17) {
861 TypeLoc TL = TInfo->getTypeLoc();
862 SourceLocation EllipsisLoc;
863 if (auto PET = TL.getAs<PackExpansionTypeLoc>()) {
864 EllipsisLoc = PET.getEllipsisLoc();
865 TL = PET.getPatternLoc();
866 }
867
868 CXXScopeSpec SS;
869 if (auto ET = TL.getAs<ElaboratedTypeLoc>()) {
870 SS.Adopt(ET.getQualifierLoc());
871 TL = ET.getNamedTypeLoc();
872 }
873
874 if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) {
875 TemplateName Name = DTST.getTypePtr()->getTemplateName();
876 if (SS.isSet())
877 Name = Context.getQualifiedTemplateName(SS.getScopeRep(),
878 /*HasTemplateKeyword*/ false,
879 Name.getAsTemplateDecl());
880 ParsedTemplateArgument Result(SS, TemplateTy::make(Name),
881 DTST.getTemplateNameLoc());
882 if (EllipsisLoc.isValid())
883 Result = Result.getTemplatePackExpansion(EllipsisLoc);
884 return Result;
885 }
886 }
887
888 // This is a normal type template argument. Note, if the type template
889 // argument is an injected-class-name for a template, it has a dual nature
890 // and can be used as either a type or a template. We handle that in
891 // convertTypeTemplateArgumentToTemplate.
892 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
893 ParsedType.get().getAsOpaquePtr(),
894 TInfo->getTypeLoc().getBeginLoc());
895}
896
897/// ActOnTypeParameter - Called when a C++ template type parameter
898/// (e.g., "typename T") has been parsed. Typename specifies whether
899/// the keyword "typename" was used to declare the type parameter
900/// (otherwise, "class" was used), and KeyLoc is the location of the
901/// "class" or "typename" keyword. ParamName is the name of the
902/// parameter (NULL indicates an unnamed template parameter) and
903/// ParamNameLoc is the location of the parameter name (if any).
904/// If the type parameter has a default argument, it will be added
905/// later via ActOnTypeParameterDefault.
906NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
907 SourceLocation EllipsisLoc,
908 SourceLocation KeyLoc,
909 IdentifierInfo *ParamName,
910 SourceLocation ParamNameLoc,
911 unsigned Depth, unsigned Position,
912 SourceLocation EqualLoc,
913 ParsedType DefaultArg) {
914 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 915, __PRETTY_FUNCTION__))
915 "Template type parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 915, __PRETTY_FUNCTION__))
;
916
917 SourceLocation Loc = ParamNameLoc;
918 if (!ParamName)
919 Loc = KeyLoc;
920
921 bool IsParameterPack = EllipsisLoc.isValid();
922 TemplateTypeParmDecl *Param
923 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
924 KeyLoc, Loc, Depth, Position, ParamName,
925 Typename, IsParameterPack);
926 Param->setAccess(AS_public);
927
928 if (ParamName) {
929 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
930
931 // Add the template parameter into the current scope.
932 S->AddDecl(Param);
933 IdResolver.AddDecl(Param);
934 }
935
936 // C++0x [temp.param]p9:
937 // A default template-argument may be specified for any kind of
938 // template-parameter that is not a template parameter pack.
939 if (DefaultArg && IsParameterPack) {
940 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
941 DefaultArg = nullptr;
942 }
943
944 // Handle the default argument, if provided.
945 if (DefaultArg) {
946 TypeSourceInfo *DefaultTInfo;
947 GetTypeFromParser(DefaultArg, &DefaultTInfo);
948
949 assert(DefaultTInfo && "expected source information for type")((DefaultTInfo && "expected source information for type"
) ? static_cast<void> (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 949, __PRETTY_FUNCTION__))
;
950
951 // Check for unexpanded parameter packs.
952 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
953 UPPC_DefaultArgument))
954 return Param;
955
956 // Check the template argument itself.
957 if (CheckTemplateArgument(Param, DefaultTInfo)) {
958 Param->setInvalidDecl();
959 return Param;
960 }
961
962 Param->setDefaultArgument(DefaultTInfo);
963 }
964
965 return Param;
966}
967
968/// Check that the type of a non-type template parameter is
969/// well-formed.
970///
971/// \returns the (possibly-promoted) parameter type if valid;
972/// otherwise, produces a diagnostic and returns a NULL type.
973QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
974 SourceLocation Loc) {
975 if (TSI->getType()->isUndeducedType()) {
976 // C++17 [temp.dep.expr]p3:
977 // An id-expression is type-dependent if it contains
978 // - an identifier associated by name lookup with a non-type
979 // template-parameter declared with a type that contains a
980 // placeholder type (7.1.7.4),
981 TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy);
982 }
983
984 return CheckNonTypeTemplateParameterType(TSI->getType(), Loc);
985}
986
987QualType Sema::CheckNonTypeTemplateParameterType(QualType T,
988 SourceLocation Loc) {
989 // We don't allow variably-modified types as the type of non-type template
990 // parameters.
991 if (T->isVariablyModifiedType()) {
992 Diag(Loc, diag::err_variably_modified_nontype_template_param)
993 << T;
994 return QualType();
995 }
996
997 // C++ [temp.param]p4:
998 //
999 // A non-type template-parameter shall have one of the following
1000 // (optionally cv-qualified) types:
1001 //
1002 // -- integral or enumeration type,
1003 if (T->isIntegralOrEnumerationType() ||
1004 // -- pointer to object or pointer to function,
1005 T->isPointerType() ||
1006 // -- reference to object or reference to function,
1007 T->isReferenceType() ||
1008 // -- pointer to member,
1009 T->isMemberPointerType() ||
1010 // -- std::nullptr_t.
1011 T->isNullPtrType() ||
1012 // If T is a dependent type, we can't do the check now, so we
1013 // assume that it is well-formed.
1014 T->isDependentType() ||
1015 // Allow use of auto in template parameter declarations.
1016 T->isUndeducedType()) {
1017 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
1018 // are ignored when determining its type.
1019 return T.getUnqualifiedType();
1020 }
1021
1022 // C++ [temp.param]p8:
1023 //
1024 // A non-type template-parameter of type "array of T" or
1025 // "function returning T" is adjusted to be of type "pointer to
1026 // T" or "pointer to function returning T", respectively.
1027 else if (T->isArrayType() || T->isFunctionType())
1028 return Context.getDecayedType(T);
1029
1030 Diag(Loc, diag::err_template_nontype_parm_bad_type)
1031 << T;
1032
1033 return QualType();
1034}
1035
1036NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
1037 unsigned Depth,
1038 unsigned Position,
1039 SourceLocation EqualLoc,
1040 Expr *Default) {
1041 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
1042
1043 // Check that we have valid decl-specifiers specified.
1044 auto CheckValidDeclSpecifiers = [this, &D] {
1045 // C++ [temp.param]
1046 // p1
1047 // template-parameter:
1048 // ...
1049 // parameter-declaration
1050 // p2
1051 // ... A storage class shall not be specified in a template-parameter
1052 // declaration.
1053 // [dcl.typedef]p1:
1054 // The typedef specifier [...] shall not be used in the decl-specifier-seq
1055 // of a parameter-declaration
1056 const DeclSpec &DS = D.getDeclSpec();
1057 auto EmitDiag = [this](SourceLocation Loc) {
1058 Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm)
1059 << FixItHint::CreateRemoval(Loc);
1060 };
1061 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified)
1062 EmitDiag(DS.getStorageClassSpecLoc());
1063
1064 if (DS.getThreadStorageClassSpec() != TSCS_unspecified)
1065 EmitDiag(DS.getThreadStorageClassSpecLoc());
1066
1067 // [dcl.inline]p1:
1068 // The inline specifier can be applied only to the declaration or
1069 // definition of a variable or function.
1070
1071 if (DS.isInlineSpecified())
1072 EmitDiag(DS.getInlineSpecLoc());
1073
1074 // [dcl.constexpr]p1:
1075 // The constexpr specifier shall be applied only to the definition of a
1076 // variable or variable template or the declaration of a function or
1077 // function template.
1078
1079 if (DS.isConstexprSpecified())
1080 EmitDiag(DS.getConstexprSpecLoc());
1081
1082 // [dcl.fct.spec]p1:
1083 // Function-specifiers can be used only in function declarations.
1084
1085 if (DS.isVirtualSpecified())
1086 EmitDiag(DS.getVirtualSpecLoc());
1087
1088 if (DS.isExplicitSpecified())
1089 EmitDiag(DS.getExplicitSpecLoc());
1090
1091 if (DS.isNoreturnSpecified())
1092 EmitDiag(DS.getNoreturnSpecLoc());
1093 };
1094
1095 CheckValidDeclSpecifiers();
1096
1097 if (TInfo->getType()->isUndeducedType()) {
1098 Diag(D.getIdentifierLoc(),
1099 diag::warn_cxx14_compat_template_nontype_parm_auto_type)
1100 << QualType(TInfo->getType()->getContainedAutoType(), 0);
1101 }
1102
1103 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1104, __PRETTY_FUNCTION__))
1104 "Non-type template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1104, __PRETTY_FUNCTION__))
;
1105 bool Invalid = false;
1106
1107 QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc());
1108 if (T.isNull()) {
1109 T = Context.IntTy; // Recover with an 'int' type.
1110 Invalid = true;
1111 }
1112
1113 IdentifierInfo *ParamName = D.getIdentifier();
1114 bool IsParameterPack = D.hasEllipsis();
1115 NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create(
1116 Context, Context.getTranslationUnitDecl(), D.getBeginLoc(),
1117 D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack,
1118 TInfo);
1119 Param->setAccess(AS_public);
1120
1121 if (Invalid)
1122 Param->setInvalidDecl();
1123
1124 if (ParamName) {
1125 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
1126 ParamName);
1127
1128 // Add the template parameter into the current scope.
1129 S->AddDecl(Param);
1130 IdResolver.AddDecl(Param);
1131 }
1132
1133 // C++0x [temp.param]p9:
1134 // A default template-argument may be specified for any kind of
1135 // template-parameter that is not a template parameter pack.
1136 if (Default && IsParameterPack) {
1137 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1138 Default = nullptr;
1139 }
1140
1141 // Check the well-formedness of the default template argument, if provided.
1142 if (Default) {
1143 // Check for unexpanded parameter packs.
1144 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
1145 return Param;
1146
1147 TemplateArgument Converted;
1148 ExprResult DefaultRes =
1149 CheckTemplateArgument(Param, Param->getType(), Default, Converted);
1150 if (DefaultRes.isInvalid()) {
1151 Param->setInvalidDecl();
1152 return Param;
1153 }
1154 Default = DefaultRes.get();
1155
1156 Param->setDefaultArgument(Default);
1157 }
1158
1159 return Param;
1160}
1161
1162/// ActOnTemplateTemplateParameter - Called when a C++ template template
1163/// parameter (e.g. T in template <template \<typename> class T> class array)
1164/// has been parsed. S is the current scope.
1165NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S,
1166 SourceLocation TmpLoc,
1167 TemplateParameterList *Params,
1168 SourceLocation EllipsisLoc,
1169 IdentifierInfo *Name,
1170 SourceLocation NameLoc,
1171 unsigned Depth,
1172 unsigned Position,
1173 SourceLocation EqualLoc,
1174 ParsedTemplateArgument Default) {
1175 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1176, __PRETTY_FUNCTION__))
1176 "Template template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1176, __PRETTY_FUNCTION__))
;
1177
1178 // Construct the parameter object.
1179 bool IsParameterPack = EllipsisLoc.isValid();
1180 TemplateTemplateParmDecl *Param =
1181 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1182 NameLoc.isInvalid()? TmpLoc : NameLoc,
1183 Depth, Position, IsParameterPack,
1184 Name, Params);
1185 Param->setAccess(AS_public);
1186
1187 // If the template template parameter has a name, then link the identifier
1188 // into the scope and lookup mechanisms.
1189 if (Name) {
1190 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
1191
1192 S->AddDecl(Param);
1193 IdResolver.AddDecl(Param);
1194 }
1195
1196 if (Params->size() == 0) {
1197 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
1198 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
1199 Param->setInvalidDecl();
1200 }
1201
1202 // C++0x [temp.param]p9:
1203 // A default template-argument may be specified for any kind of
1204 // template-parameter that is not a template parameter pack.
1205 if (IsParameterPack && !Default.isInvalid()) {
1206 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1207 Default = ParsedTemplateArgument();
1208 }
1209
1210 if (!Default.isInvalid()) {
1211 // Check only that we have a template template argument. We don't want to
1212 // try to check well-formedness now, because our template template parameter
1213 // might have dependent types in its template parameters, which we wouldn't
1214 // be able to match now.
1215 //
1216 // If none of the template template parameter's template arguments mention
1217 // other template parameters, we could actually perform more checking here.
1218 // However, it isn't worth doing.
1219 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
1220 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
1221 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template)
1222 << DefaultArg.getSourceRange();
1223 return Param;
1224 }
1225
1226 // Check for unexpanded parameter packs.
1227 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
1228 DefaultArg.getArgument().getAsTemplate(),
1229 UPPC_DefaultArgument))
1230 return Param;
1231
1232 Param->setDefaultArgument(Context, DefaultArg);
1233 }
1234
1235 return Param;
1236}
1237
1238/// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally
1239/// constrained by RequiresClause, that contains the template parameters in
1240/// Params.
1241TemplateParameterList *
1242Sema::ActOnTemplateParameterList(unsigned Depth,
1243 SourceLocation ExportLoc,
1244 SourceLocation TemplateLoc,
1245 SourceLocation LAngleLoc,
1246 ArrayRef<NamedDecl *> Params,
1247 SourceLocation RAngleLoc,
1248 Expr *RequiresClause) {
1249 if (ExportLoc.isValid())
1250 Diag(ExportLoc, diag::warn_template_export_unsupported);
1251
1252 return TemplateParameterList::Create(
1253 Context, TemplateLoc, LAngleLoc,
1254 llvm::makeArrayRef(Params.data(), Params.size()),
1255 RAngleLoc, RequiresClause);
1256}
1257
1258static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
1259 if (SS.isSet())
1260 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
1261}
1262
1263DeclResult Sema::CheckClassTemplate(
1264 Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc,
1265 CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc,
1266 const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams,
1267 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
1268 SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists,
1269 TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) {
1270 assert(TemplateParams && TemplateParams->size() > 0 &&((TemplateParams && TemplateParams->size() > 0 &&
"No template parameters") ? static_cast<void> (0) : __assert_fail
("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1271, __PRETTY_FUNCTION__))
1271 "No template parameters")((TemplateParams && TemplateParams->size() > 0 &&
"No template parameters") ? static_cast<void> (0) : __assert_fail
("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1271, __PRETTY_FUNCTION__))
;
1272 assert(TUK != TUK_Reference && "Can only declare or define class templates")((TUK != TUK_Reference && "Can only declare or define class templates"
) ? static_cast<void> (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1272, __PRETTY_FUNCTION__))
;
1273 bool Invalid = false;
1274
1275 // Check that we can declare a template here.
1276 if (CheckTemplateDeclScope(S, TemplateParams))
1277 return true;
1278
1279 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
1280 assert(Kind != TTK_Enum && "can't build template of enumerated type")((Kind != TTK_Enum && "can't build template of enumerated type"
) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1280, __PRETTY_FUNCTION__))
;
1281
1282 // There is no such thing as an unnamed class template.
1283 if (!Name) {
1284 Diag(KWLoc, diag::err_template_unnamed_class);
1285 return true;
1286 }
1287
1288 // Find any previous declaration with this name. For a friend with no
1289 // scope explicitly specified, we only look for tag declarations (per
1290 // C++11 [basic.lookup.elab]p2).
1291 DeclContext *SemanticContext;
1292 LookupResult Previous(*this, Name, NameLoc,
1293 (SS.isEmpty() && TUK == TUK_Friend)
1294 ? LookupTagName : LookupOrdinaryName,
1295 forRedeclarationInCurContext());
1296 if (SS.isNotEmpty() && !SS.isInvalid()) {
1297 SemanticContext = computeDeclContext(SS, true);
1298 if (!SemanticContext) {
1299 // FIXME: Horrible, horrible hack! We can't currently represent this
1300 // in the AST, and historically we have just ignored such friend
1301 // class templates, so don't complain here.
1302 Diag(NameLoc, TUK == TUK_Friend
1303 ? diag::warn_template_qualified_friend_ignored
1304 : diag::err_template_qualified_declarator_no_match)
1305 << SS.getScopeRep() << SS.getRange();
1306 return TUK != TUK_Friend;
1307 }
1308
1309 if (RequireCompleteDeclContext(SS, SemanticContext))
1310 return true;
1311
1312 // If we're adding a template to a dependent context, we may need to
1313 // rebuilding some of the types used within the template parameter list,
1314 // now that we know what the current instantiation is.
1315 if (SemanticContext->isDependentContext()) {
1316 ContextRAII SavedContext(*this, SemanticContext);
1317 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
1318 Invalid = true;
1319 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
1320 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false);
1321
1322 LookupQualifiedName(Previous, SemanticContext);
1323 } else {
1324 SemanticContext = CurContext;
1325
1326 // C++14 [class.mem]p14:
1327 // If T is the name of a class, then each of the following shall have a
1328 // name different from T:
1329 // -- every member template of class T
1330 if (TUK != TUK_Friend &&
1331 DiagnoseClassNameShadow(SemanticContext,
1332 DeclarationNameInfo(Name, NameLoc)))
1333 return true;
1334
1335 LookupName(Previous, S);
1336 }
1337
1338 if (Previous.isAmbiguous())
1339 return true;
1340
1341 NamedDecl *PrevDecl = nullptr;
1342 if (Previous.begin() != Previous.end())
1343 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1344
1345 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1346 // Maybe we will complain about the shadowed template parameter.
1347 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1348 // Just pretend that we didn't see the previous declaration.
1349 PrevDecl = nullptr;
1350 }
1351
1352 // If there is a previous declaration with the same name, check
1353 // whether this is a valid redeclaration.
1354 ClassTemplateDecl *PrevClassTemplate =
1355 dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
1356
1357 // We may have found the injected-class-name of a class template,
1358 // class template partial specialization, or class template specialization.
1359 // In these cases, grab the template that is being defined or specialized.
1360 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
1361 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
1362 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
1363 PrevClassTemplate
1364 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
1365 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
1366 PrevClassTemplate
1367 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
1368 ->getSpecializedTemplate();
1369 }
1370 }
1371
1372 if (TUK == TUK_Friend) {
1373 // C++ [namespace.memdef]p3:
1374 // [...] When looking for a prior declaration of a class or a function
1375 // declared as a friend, and when the name of the friend class or
1376 // function is neither a qualified name nor a template-id, scopes outside
1377 // the innermost enclosing namespace scope are not considered.
1378 if (!SS.isSet()) {
1379 DeclContext *OutermostContext = CurContext;
1380 while (!OutermostContext->isFileContext())
1381 OutermostContext = OutermostContext->getLookupParent();
1382
1383 if (PrevDecl &&
1384 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
1385 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
1386 SemanticContext = PrevDecl->getDeclContext();
1387 } else {
1388 // Declarations in outer scopes don't matter. However, the outermost
1389 // context we computed is the semantic context for our new
1390 // declaration.
1391 PrevDecl = PrevClassTemplate = nullptr;
1392 SemanticContext = OutermostContext;
1393
1394 // Check that the chosen semantic context doesn't already contain a
1395 // declaration of this name as a non-tag type.
1396 Previous.clear(LookupOrdinaryName);
1397 DeclContext *LookupContext = SemanticContext;
1398 while (LookupContext->isTransparentContext())
1399 LookupContext = LookupContext->getLookupParent();
1400 LookupQualifiedName(Previous, LookupContext);
1401
1402 if (Previous.isAmbiguous())
1403 return true;
1404
1405 if (Previous.begin() != Previous.end())
1406 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1407 }
1408 }
1409 } else if (PrevDecl &&
1410 !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext,
1411 S, SS.isValid()))
1412 PrevDecl = PrevClassTemplate = nullptr;
1413
1414 if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>(
1415 PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) {
1416 if (SS.isEmpty() &&
1417 !(PrevClassTemplate &&
1418 PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals(
1419 SemanticContext->getRedeclContext()))) {
1420 Diag(KWLoc, diag::err_using_decl_conflict_reverse);
1421 Diag(Shadow->getTargetDecl()->getLocation(),
1422 diag::note_using_decl_target);
1423 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
1424 // Recover by ignoring the old declaration.
1425 PrevDecl = PrevClassTemplate = nullptr;
1426 }
1427 }
1428
1429 // TODO Memory management; associated constraints are not always stored.
1430 Expr *const CurAC = formAssociatedConstraints(TemplateParams, nullptr);
1431
1432 if (PrevClassTemplate) {
1433 // Ensure that the template parameter lists are compatible. Skip this check
1434 // for a friend in a dependent context: the template parameter list itself
1435 // could be dependent.
1436 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1437 !TemplateParameterListsAreEqual(TemplateParams,
1438 PrevClassTemplate->getTemplateParameters(),
1439 /*Complain=*/true,
1440 TPL_TemplateMatch))
1441 return true;
1442
1443 // Check for matching associated constraints on redeclarations.
1444 const Expr *const PrevAC = PrevClassTemplate->getAssociatedConstraints();
1445 const bool RedeclACMismatch = [&] {
1446 if (!(CurAC || PrevAC))
1447 return false; // Nothing to check; no mismatch.
1448 if (CurAC && PrevAC) {
1449 llvm::FoldingSetNodeID CurACInfo, PrevACInfo;
1450 CurAC->Profile(CurACInfo, Context, /*Canonical=*/true);
1451 PrevAC->Profile(PrevACInfo, Context, /*Canonical=*/true);
1452 if (CurACInfo == PrevACInfo)
1453 return false; // All good; no mismatch.
1454 }
1455 return true;
1456 }();
1457
1458 if (RedeclACMismatch) {
1459 Diag(CurAC ? CurAC->getBeginLoc() : NameLoc,
1460 diag::err_template_different_associated_constraints);
1461 Diag(PrevAC ? PrevAC->getBeginLoc() : PrevClassTemplate->getLocation(),
1462 diag::note_template_prev_declaration)
1463 << /*declaration*/ 0;
1464 return true;
1465 }
1466
1467 // C++ [temp.class]p4:
1468 // In a redeclaration, partial specialization, explicit
1469 // specialization or explicit instantiation of a class template,
1470 // the class-key shall agree in kind with the original class
1471 // template declaration (7.1.5.3).
1472 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
1473 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
1474 TUK == TUK_Definition, KWLoc, Name)) {
1475 Diag(KWLoc, diag::err_use_with_wrong_tag)
1476 << Name
1477 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
1478 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
1479 Kind = PrevRecordDecl->getTagKind();
1480 }
1481
1482 // Check for redefinition of this class template.
1483 if (TUK == TUK_Definition) {
1484 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
1485 // If we have a prior definition that is not visible, treat this as
1486 // simply making that previous definition visible.
1487 NamedDecl *Hidden = nullptr;
1488 if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) {
1489 SkipBody->ShouldSkip = true;
1490 SkipBody->Previous = Def;
1491 auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate();
1492 assert(Tmpl && "original definition of a class template is not a "((Tmpl && "original definition of a class template is not a "
"class template?") ? static_cast<void> (0) : __assert_fail
("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1493, __PRETTY_FUNCTION__))
1493 "class template?")((Tmpl && "original definition of a class template is not a "
"class template?") ? static_cast<void> (0) : __assert_fail
("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1493, __PRETTY_FUNCTION__))
;
1494 makeMergedDefinitionVisible(Hidden);
1495 makeMergedDefinitionVisible(Tmpl);
1496 } else {
1497 Diag(NameLoc, diag::err_redefinition) << Name;
1498 Diag(Def->getLocation(), diag::note_previous_definition);
1499 // FIXME: Would it make sense to try to "forget" the previous
1500 // definition, as part of error recovery?
1501 return true;
1502 }
1503 }
1504 }
1505 } else if (PrevDecl) {
1506 // C++ [temp]p5:
1507 // A class template shall not have the same name as any other
1508 // template, class, function, object, enumeration, enumerator,
1509 // namespace, or type in the same scope (3.3), except as specified
1510 // in (14.5.4).
1511 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1512 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1513 return true;
1514 }
1515
1516 // Check the template parameter list of this declaration, possibly
1517 // merging in the template parameter list from the previous class
1518 // template declaration. Skip this check for a friend in a dependent
1519 // context, because the template parameter list might be dependent.
1520 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1521 CheckTemplateParameterList(
1522 TemplateParams,
1523 PrevClassTemplate
1524 ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters()
1525 : nullptr,
1526 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1527 SemanticContext->isDependentContext())
1528 ? TPC_ClassTemplateMember
1529 : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate,
1530 SkipBody))
1531 Invalid = true;
1532
1533 if (SS.isSet()) {
1534 // If the name of the template was qualified, we must be defining the
1535 // template out-of-line.
1536 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1537 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1538 : diag::err_member_decl_does_not_match)
1539 << Name << SemanticContext << /*IsDefinition*/true << SS.getRange();
1540 Invalid = true;
1541 }
1542 }
1543
1544 // If this is a templated friend in a dependent context we should not put it
1545 // on the redecl chain. In some cases, the templated friend can be the most
1546 // recent declaration tricking the template instantiator to make substitutions
1547 // there.
1548 // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious
1549 bool ShouldAddRedecl
1550 = !(TUK == TUK_Friend && CurContext->isDependentContext());
1551
1552 CXXRecordDecl *NewClass =
1553 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
1554 PrevClassTemplate && ShouldAddRedecl ?
1555 PrevClassTemplate->getTemplatedDecl() : nullptr,
1556 /*DelayTypeCreation=*/true);
1557 SetNestedNameSpecifier(NewClass, SS);
1558 if (NumOuterTemplateParamLists > 0)
1559 NewClass->setTemplateParameterListsInfo(
1560 Context, llvm::makeArrayRef(OuterTemplateParamLists,
1561 NumOuterTemplateParamLists));
1562
1563 // Add alignment attributes if necessary; these attributes are checked when
1564 // the ASTContext lays out the structure.
1565 if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) {
1566 AddAlignmentAttributesForRecord(NewClass);
1567 AddMsStructLayoutForRecord(NewClass);
1568 }
1569
1570 // Attach the associated constraints when the declaration will not be part of
1571 // a decl chain.
1572 Expr *const ACtoAttach =
1573 PrevClassTemplate && ShouldAddRedecl ? nullptr : CurAC;
1574
1575 ClassTemplateDecl *NewTemplate
1576 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1577 DeclarationName(Name), TemplateParams,
1578 NewClass, ACtoAttach);
1579
1580 if (ShouldAddRedecl)
1581 NewTemplate->setPreviousDecl(PrevClassTemplate);
1582
1583 NewClass->setDescribedClassTemplate(NewTemplate);
1584
1585 if (ModulePrivateLoc.isValid())
1586 NewTemplate->setModulePrivate();
1587
1588 // Build the type for the class template declaration now.
1589 QualType T = NewTemplate->getInjectedClassNameSpecialization();
1590 T = Context.getInjectedClassNameType(NewClass, T);
1591 assert(T->isDependentType() && "Class template type is not dependent?")((T->isDependentType() && "Class template type is not dependent?"
) ? static_cast<void> (0) : __assert_fail ("T->isDependentType() && \"Class template type is not dependent?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1591, __PRETTY_FUNCTION__))
;
1592 (void)T;
1593
1594 // If we are providing an explicit specialization of a member that is a
1595 // class template, make a note of that.
1596 if (PrevClassTemplate &&
1597 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1598 PrevClassTemplate->setMemberSpecialization();
1599
1600 // Set the access specifier.
1601 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
1602 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
1603
1604 // Set the lexical context of these templates
1605 NewClass->setLexicalDeclContext(CurContext);
1606 NewTemplate->setLexicalDeclContext(CurContext);
1607
1608 if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip))
1609 NewClass->startDefinition();
1610
1611 ProcessDeclAttributeList(S, NewClass, Attr);
1612
1613 if (PrevClassTemplate)
1614 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1615
1616 AddPushedVisibilityAttribute(NewClass);
1617
1618 if (TUK != TUK_Friend) {
1619 // Per C++ [basic.scope.temp]p2, skip the template parameter scopes.
1620 Scope *Outer = S;
1621 while ((Outer->getFlags() & Scope::TemplateParamScope) != 0)
1622 Outer = Outer->getParent();
1623 PushOnScopeChains(NewTemplate, Outer);
1624 } else {
1625 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
1626 NewTemplate->setAccess(PrevClassTemplate->getAccess());
1627 NewClass->setAccess(PrevClassTemplate->getAccess());
1628 }
1629
1630 NewTemplate->setObjectOfFriendDecl();
1631
1632 // Friend templates are visible in fairly strange ways.
1633 if (!CurContext->isDependentContext()) {
1634 DeclContext *DC = SemanticContext->getRedeclContext();
1635 DC->makeDeclVisibleInContext(NewTemplate);
1636 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1637 PushOnScopeChains(NewTemplate, EnclosingScope,
1638 /* AddToContext = */ false);
1639 }
1640
1641 FriendDecl *Friend = FriendDecl::Create(
1642 Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc);
1643 Friend->setAccess(AS_public);
1644 CurContext->addDecl(Friend);
1645 }
1646
1647 if (PrevClassTemplate)
1648 CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate);
1649
1650 if (Invalid) {
1651 NewTemplate->setInvalidDecl();
1652 NewClass->setInvalidDecl();
1653 }
1654
1655 ActOnDocumentableDecl(NewTemplate);
1656
1657 if (SkipBody && SkipBody->ShouldSkip)
1658 return SkipBody->Previous;
1659
1660 return NewTemplate;
1661}
1662
1663namespace {
1664/// Tree transform to "extract" a transformed type from a class template's
1665/// constructor to a deduction guide.
1666class ExtractTypeForDeductionGuide
1667 : public TreeTransform<ExtractTypeForDeductionGuide> {
1668public:
1669 typedef TreeTransform<ExtractTypeForDeductionGuide> Base;
1670 ExtractTypeForDeductionGuide(Sema &SemaRef) : Base(SemaRef) {}
1671
1672 TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); }
1673
1674 QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) {
1675 return TransformType(
1676 TLB,
1677 TL.getTypedefNameDecl()->getTypeSourceInfo()->getTypeLoc());
1678 }
1679};
1680
1681/// Transform to convert portions of a constructor declaration into the
1682/// corresponding deduction guide, per C++1z [over.match.class.deduct]p1.
1683struct ConvertConstructorToDeductionGuideTransform {
1684 ConvertConstructorToDeductionGuideTransform(Sema &S,
1685 ClassTemplateDecl *Template)
1686 : SemaRef(S), Template(Template) {}
1687
1688 Sema &SemaRef;
1689 ClassTemplateDecl *Template;
1690
1691 DeclContext *DC = Template->getDeclContext();
1692 CXXRecordDecl *Primary = Template->getTemplatedDecl();
1693 DeclarationName DeductionGuideName =
1694 SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template);
1695
1696 QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary);
1697
1698 // Index adjustment to apply to convert depth-1 template parameters into
1699 // depth-0 template parameters.
1700 unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size();
1701
1702 /// Transform a constructor declaration into a deduction guide.
1703 NamedDecl *transformConstructor(FunctionTemplateDecl *FTD,
1704 CXXConstructorDecl *CD) {
1705 SmallVector<TemplateArgument, 16> SubstArgs;
1706
1707 LocalInstantiationScope Scope(SemaRef);
1708
1709 // C++ [over.match.class.deduct]p1:
1710 // -- For each constructor of the class template designated by the
1711 // template-name, a function template with the following properties:
1712
1713 // -- The template parameters are the template parameters of the class
1714 // template followed by the template parameters (including default
1715 // template arguments) of the constructor, if any.
1716 TemplateParameterList *TemplateParams = Template->getTemplateParameters();
1717 if (FTD) {
1718 TemplateParameterList *InnerParams = FTD->getTemplateParameters();
1719 SmallVector<NamedDecl *, 16> AllParams;
1720 AllParams.reserve(TemplateParams->size() + InnerParams->size());
1721 AllParams.insert(AllParams.begin(),
1722 TemplateParams->begin(), TemplateParams->end());
1723 SubstArgs.reserve(InnerParams->size());
1724
1725 // Later template parameters could refer to earlier ones, so build up
1726 // a list of substituted template arguments as we go.
1727 for (NamedDecl *Param : *InnerParams) {
1728 MultiLevelTemplateArgumentList Args;
1729 Args.addOuterTemplateArguments(SubstArgs);
1730 Args.addOuterRetainedLevel();
1731 NamedDecl *NewParam = transformTemplateParameter(Param, Args);
1732 if (!NewParam)
1733 return nullptr;
1734 AllParams.push_back(NewParam);
1735 SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument(
1736 SemaRef.Context.getInjectedTemplateArg(NewParam)));
1737 }
1738 TemplateParams = TemplateParameterList::Create(
1739 SemaRef.Context, InnerParams->getTemplateLoc(),
1740 InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(),
1741 /*FIXME: RequiresClause*/ nullptr);
1742 }
1743
1744 // If we built a new template-parameter-list, track that we need to
1745 // substitute references to the old parameters into references to the
1746 // new ones.
1747 MultiLevelTemplateArgumentList Args;
1748 if (FTD) {
1749 Args.addOuterTemplateArguments(SubstArgs);
1750 Args.addOuterRetainedLevel();
1751 }
1752
1753 FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc()
1754 .getAsAdjusted<FunctionProtoTypeLoc>();
1755 assert(FPTL && "no prototype for constructor declaration")((FPTL && "no prototype for constructor declaration")
? static_cast<void> (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1755, __PRETTY_FUNCTION__))
;
1756
1757 // Transform the type of the function, adjusting the return type and
1758 // replacing references to the old parameters with references to the
1759 // new ones.
1760 TypeLocBuilder TLB;
1761 SmallVector<ParmVarDecl*, 8> Params;
1762 QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args);
1763 if (NewType.isNull())
1764 return nullptr;
1765 TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType);
1766
1767 return buildDeductionGuide(TemplateParams, CD->isExplicit(), NewTInfo,
1768 CD->getBeginLoc(), CD->getLocation(),
1769 CD->getEndLoc());
1770 }
1771
1772 /// Build a deduction guide with the specified parameter types.
1773 NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) {
1774 SourceLocation Loc = Template->getLocation();
1775
1776 // Build the requested type.
1777 FunctionProtoType::ExtProtoInfo EPI;
1778 EPI.HasTrailingReturn = true;
1779 QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc,
1780 DeductionGuideName, EPI);
1781 TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc);
1782
1783 FunctionProtoTypeLoc FPTL =
1784 TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>();
1785
1786 // Build the parameters, needed during deduction / substitution.
1787 SmallVector<ParmVarDecl*, 4> Params;
1788 for (auto T : ParamTypes) {
1789 ParmVarDecl *NewParam = ParmVarDecl::Create(
1790 SemaRef.Context, DC, Loc, Loc, nullptr, T,
1791 SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr);
1792 NewParam->setScopeInfo(0, Params.size());
1793 FPTL.setParam(Params.size(), NewParam);
1794 Params.push_back(NewParam);
1795 }
1796
1797 return buildDeductionGuide(Template->getTemplateParameters(), false, TSI,
1798 Loc, Loc, Loc);
1799 }
1800
1801private:
1802 /// Transform a constructor template parameter into a deduction guide template
1803 /// parameter, rebuilding any internal references to earlier parameters and
1804 /// renumbering as we go.
1805 NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam,
1806 MultiLevelTemplateArgumentList &Args) {
1807 if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) {
1808 // TemplateTypeParmDecl's index cannot be changed after creation, so
1809 // substitute it directly.
1810 auto *NewTTP = TemplateTypeParmDecl::Create(
1811 SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(),
1812 /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(),
1813 TTP->getIdentifier(), TTP->wasDeclaredWithTypename(),
1814 TTP->isParameterPack());
1815 if (TTP->hasDefaultArgument()) {
1816 TypeSourceInfo *InstantiatedDefaultArg =
1817 SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args,
1818 TTP->getDefaultArgumentLoc(), TTP->getDeclName());
1819 if (InstantiatedDefaultArg)
1820 NewTTP->setDefaultArgument(InstantiatedDefaultArg);
1821 }
1822 SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam,
1823 NewTTP);
1824 return NewTTP;
1825 }
1826
1827 if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam))
1828 return transformTemplateParameterImpl(TTP, Args);
1829
1830 return transformTemplateParameterImpl(
1831 cast<NonTypeTemplateParmDecl>(TemplateParam), Args);
1832 }
1833 template<typename TemplateParmDecl>
1834 TemplateParmDecl *
1835 transformTemplateParameterImpl(TemplateParmDecl *OldParam,
1836 MultiLevelTemplateArgumentList &Args) {
1837 // Ask the template instantiator to do the heavy lifting for us, then adjust
1838 // the index of the parameter once it's done.
1839 auto *NewParam =
1840 cast_or_null<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args));
1841 assert(NewParam->getDepth() == 0 && "unexpected template param depth")((NewParam->getDepth() == 0 && "unexpected template param depth"
) ? static_cast<void> (0) : __assert_fail ("NewParam->getDepth() == 0 && \"unexpected template param depth\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1841, __PRETTY_FUNCTION__))
;
1842 NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment);
1843 return NewParam;
1844 }
1845
1846 QualType transformFunctionProtoType(TypeLocBuilder &TLB,
1847 FunctionProtoTypeLoc TL,
1848 SmallVectorImpl<ParmVarDecl*> &Params,
1849 MultiLevelTemplateArgumentList &Args) {
1850 SmallVector<QualType, 4> ParamTypes;
1851 const FunctionProtoType *T = TL.getTypePtr();
1852
1853 // -- The types of the function parameters are those of the constructor.
1854 for (auto *OldParam : TL.getParams()) {
1855 ParmVarDecl *NewParam = transformFunctionTypeParam(OldParam, Args);
1856 if (!NewParam)
1857 return QualType();
1858 ParamTypes.push_back(NewParam->getType());
1859 Params.push_back(NewParam);
1860 }
1861
1862 // -- The return type is the class template specialization designated by
1863 // the template-name and template arguments corresponding to the
1864 // template parameters obtained from the class template.
1865 //
1866 // We use the injected-class-name type of the primary template instead.
1867 // This has the convenient property that it is different from any type that
1868 // the user can write in a deduction-guide (because they cannot enter the
1869 // context of the template), so implicit deduction guides can never collide
1870 // with explicit ones.
1871 QualType ReturnType = DeducedType;
1872 TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation());
1873
1874 // Resolving a wording defect, we also inherit the variadicness of the
1875 // constructor.
1876 FunctionProtoType::ExtProtoInfo EPI;
1877 EPI.Variadic = T->isVariadic();
1878 EPI.HasTrailingReturn = true;
1879
1880 QualType Result = SemaRef.BuildFunctionType(
1881 ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI);
1882 if (Result.isNull())
1883 return QualType();
1884
1885 FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result);
1886 NewTL.setLocalRangeBegin(TL.getLocalRangeBegin());
1887 NewTL.setLParenLoc(TL.getLParenLoc());
1888 NewTL.setRParenLoc(TL.getRParenLoc());
1889 NewTL.setExceptionSpecRange(SourceRange());
1890 NewTL.setLocalRangeEnd(TL.getLocalRangeEnd());
1891 for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I)
1892 NewTL.setParam(I, Params[I]);
1893
1894 return Result;
1895 }
1896
1897 ParmVarDecl *
1898 transformFunctionTypeParam(ParmVarDecl *OldParam,
1899 MultiLevelTemplateArgumentList &Args) {
1900 TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo();
1901 TypeSourceInfo *NewDI;
1902 if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) {
1903 // Expand out the one and only element in each inner pack.
1904 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0);
1905 NewDI =
1906 SemaRef.SubstType(PackTL.getPatternLoc(), Args,
1907 OldParam->getLocation(), OldParam->getDeclName());
1908 if (!NewDI) return nullptr;
1909 NewDI =
1910 SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(),
1911 PackTL.getTypePtr()->getNumExpansions());
1912 } else
1913 NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(),
1914 OldParam->getDeclName());
1915 if (!NewDI)
1916 return nullptr;
1917
1918 // Extract the type. This (for instance) replaces references to typedef
1919 // members of the current instantiations with the definitions of those
1920 // typedefs, avoiding triggering instantiation of the deduced type during
1921 // deduction.
1922 NewDI = ExtractTypeForDeductionGuide(SemaRef).transform(NewDI);
1923
1924 // Resolving a wording defect, we also inherit default arguments from the
1925 // constructor.
1926 ExprResult NewDefArg;
1927 if (OldParam->hasDefaultArg()) {
1928 NewDefArg = SemaRef.SubstExpr(OldParam->getDefaultArg(), Args);
1929 if (NewDefArg.isInvalid())
1930 return nullptr;
1931 }
1932
1933 ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC,
1934 OldParam->getInnerLocStart(),
1935 OldParam->getLocation(),
1936 OldParam->getIdentifier(),
1937 NewDI->getType(),
1938 NewDI,
1939 OldParam->getStorageClass(),
1940 NewDefArg.get());
1941 NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(),
1942 OldParam->getFunctionScopeIndex());
1943 SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam);
1944 return NewParam;
1945 }
1946
1947 NamedDecl *buildDeductionGuide(TemplateParameterList *TemplateParams,
1948 bool Explicit, TypeSourceInfo *TInfo,
1949 SourceLocation LocStart, SourceLocation Loc,
1950 SourceLocation LocEnd) {
1951 DeclarationNameInfo Name(DeductionGuideName, Loc);
1952 ArrayRef<ParmVarDecl *> Params =
1953 TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams();
1954
1955 // Build the implicit deduction guide template.
1956 auto *Guide =
1957 CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, Explicit,
1958 Name, TInfo->getType(), TInfo, LocEnd);
1959 Guide->setImplicit();
1960 Guide->setParams(Params);
1961
1962 for (auto *Param : Params)
1963 Param->setDeclContext(Guide);
1964
1965 auto *GuideTemplate = FunctionTemplateDecl::Create(
1966 SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide);
1967 GuideTemplate->setImplicit();
1968 Guide->setDescribedFunctionTemplate(GuideTemplate);
1969
1970 if (isa<CXXRecordDecl>(DC)) {
1971 Guide->setAccess(AS_public);
1972 GuideTemplate->setAccess(AS_public);
1973 }
1974
1975 DC->addDecl(GuideTemplate);
1976 return GuideTemplate;
1977 }
1978};
1979}
1980
1981void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template,
1982 SourceLocation Loc) {
1983 DeclContext *DC = Template->getDeclContext();
1984 if (DC->isDependentContext())
1985 return;
1986
1987 ConvertConstructorToDeductionGuideTransform Transform(
1988 *this, cast<ClassTemplateDecl>(Template));
1989 if (!isCompleteType(Loc, Transform.DeducedType))
1990 return;
1991
1992 // Check whether we've already declared deduction guides for this template.
1993 // FIXME: Consider storing a flag on the template to indicate this.
1994 auto Existing = DC->lookup(Transform.DeductionGuideName);
1995 for (auto *D : Existing)
1996 if (D->isImplicit())
1997 return;
1998
1999 // In case we were expanding a pack when we attempted to declare deduction
2000 // guides, turn off pack expansion for everything we're about to do.
2001 ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
2002 // Create a template instantiation record to track the "instantiation" of
2003 // constructors into deduction guides.
2004 // FIXME: Add a kind for this to give more meaningful diagnostics. But can
2005 // this substitution process actually fail?
2006 InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template);
2007 if (BuildingDeductionGuides.isInvalid())
2008 return;
2009
2010 // Convert declared constructors into deduction guide templates.
2011 // FIXME: Skip constructors for which deduction must necessarily fail (those
2012 // for which some class template parameter without a default argument never
2013 // appears in a deduced context).
2014 bool AddedAny = false;
2015 for (NamedDecl *D : LookupConstructors(Transform.Primary)) {
2016 D = D->getUnderlyingDecl();
2017 if (D->isInvalidDecl() || D->isImplicit())
2018 continue;
2019 D = cast<NamedDecl>(D->getCanonicalDecl());
2020
2021 auto *FTD = dyn_cast<FunctionTemplateDecl>(D);
2022 auto *CD =
2023 dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D);
2024 // Class-scope explicit specializations (MS extension) do not result in
2025 // deduction guides.
2026 if (!CD || (!FTD && CD->isFunctionTemplateSpecialization()))
2027 continue;
2028
2029 Transform.transformConstructor(FTD, CD);
2030 AddedAny = true;
2031 }
2032
2033 // C++17 [over.match.class.deduct]
2034 // -- If C is not defined or does not declare any constructors, an
2035 // additional function template derived as above from a hypothetical
2036 // constructor C().
2037 if (!AddedAny)
2038 Transform.buildSimpleDeductionGuide(None);
2039
2040 // -- An additional function template derived as above from a hypothetical
2041 // constructor C(C), called the copy deduction candidate.
2042 cast<CXXDeductionGuideDecl>(
2043 cast<FunctionTemplateDecl>(
2044 Transform.buildSimpleDeductionGuide(Transform.DeducedType))
2045 ->getTemplatedDecl())
2046 ->setIsCopyDeductionCandidate();
2047}
2048
2049/// Diagnose the presence of a default template argument on a
2050/// template parameter, which is ill-formed in certain contexts.
2051///
2052/// \returns true if the default template argument should be dropped.
2053static bool DiagnoseDefaultTemplateArgument(Sema &S,
2054 Sema::TemplateParamListContext TPC,
2055 SourceLocation ParamLoc,
2056 SourceRange DefArgRange) {
2057 switch (TPC) {
2058 case Sema::TPC_ClassTemplate:
2059 case Sema::TPC_VarTemplate:
2060 case Sema::TPC_TypeAliasTemplate:
2061 return false;
2062
2063 case Sema::TPC_FunctionTemplate:
2064 case Sema::TPC_FriendFunctionTemplateDefinition:
2065 // C++ [temp.param]p9:
2066 // A default template-argument shall not be specified in a
2067 // function template declaration or a function template
2068 // definition [...]
2069 // If a friend function template declaration specifies a default
2070 // template-argument, that declaration shall be a definition and shall be
2071 // the only declaration of the function template in the translation unit.
2072 // (C++98/03 doesn't have this wording; see DR226).
2073 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
2074 diag::warn_cxx98_compat_template_parameter_default_in_function_template
2075 : diag::ext_template_parameter_default_in_function_template)
2076 << DefArgRange;
2077 return false;
2078
2079 case Sema::TPC_ClassTemplateMember:
2080 // C++0x [temp.param]p9:
2081 // A default template-argument shall not be specified in the
2082 // template-parameter-lists of the definition of a member of a
2083 // class template that appears outside of the member's class.
2084 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
2085 << DefArgRange;
2086 return true;
2087
2088 case Sema::TPC_FriendClassTemplate:
2089 case Sema::TPC_FriendFunctionTemplate:
2090 // C++ [temp.param]p9:
2091 // A default template-argument shall not be specified in a
2092 // friend template declaration.
2093 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
2094 << DefArgRange;
2095 return true;
2096
2097 // FIXME: C++0x [temp.param]p9 allows default template-arguments
2098 // for friend function templates if there is only a single
2099 // declaration (and it is a definition). Strange!
2100 }
2101
2102 llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2102)
;
2103}
2104
2105/// Check for unexpanded parameter packs within the template parameters
2106/// of a template template parameter, recursively.
2107static bool DiagnoseUnexpandedParameterPacks(Sema &S,
2108 TemplateTemplateParmDecl *TTP) {
2109 // A template template parameter which is a parameter pack is also a pack
2110 // expansion.
2111 if (TTP->isParameterPack())
2112 return false;
2113
2114 TemplateParameterList *Params = TTP->getTemplateParameters();
2115 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
2116 NamedDecl *P = Params->getParam(I);
2117 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
2118 if (!NTTP->isParameterPack() &&
2119 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
2120 NTTP->getTypeSourceInfo(),
2121 Sema::UPPC_NonTypeTemplateParameterType))
2122 return true;
2123
2124 continue;
2125 }
2126
2127 if (TemplateTemplateParmDecl *InnerTTP
2128 = dyn_cast<TemplateTemplateParmDecl>(P))
2129 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
2130 return true;
2131 }
2132
2133 return false;
2134}
2135
2136/// Checks the validity of a template parameter list, possibly
2137/// considering the template parameter list from a previous
2138/// declaration.
2139///
2140/// If an "old" template parameter list is provided, it must be
2141/// equivalent (per TemplateParameterListsAreEqual) to the "new"
2142/// template parameter list.
2143///
2144/// \param NewParams Template parameter list for a new template
2145/// declaration. This template parameter list will be updated with any
2146/// default arguments that are carried through from the previous
2147/// template parameter list.
2148///
2149/// \param OldParams If provided, template parameter list from a
2150/// previous declaration of the same template. Default template
2151/// arguments will be merged from the old template parameter list to
2152/// the new template parameter list.
2153///
2154/// \param TPC Describes the context in which we are checking the given
2155/// template parameter list.
2156///
2157/// \param SkipBody If we might have already made a prior merged definition
2158/// of this template visible, the corresponding body-skipping information.
2159/// Default argument redefinition is not an error when skipping such a body,
2160/// because (under the ODR) we can assume the default arguments are the same
2161/// as the prior merged definition.
2162///
2163/// \returns true if an error occurred, false otherwise.
2164bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
2165 TemplateParameterList *OldParams,
2166 TemplateParamListContext TPC,
2167 SkipBodyInfo *SkipBody) {
2168 bool Invalid = false;
2169
2170 // C++ [temp.param]p10:
2171 // The set of default template-arguments available for use with a
2172 // template declaration or definition is obtained by merging the
2173 // default arguments from the definition (if in scope) and all
2174 // declarations in scope in the same way default function
2175 // arguments are (8.3.6).
2176 bool SawDefaultArgument = false;
2177 SourceLocation PreviousDefaultArgLoc;
2178
2179 // Dummy initialization to avoid warnings.
2180 TemplateParameterList::iterator OldParam = NewParams->end();
2181 if (OldParams)
2182 OldParam = OldParams->begin();
2183
2184 bool RemoveDefaultArguments = false;
2185 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2186 NewParamEnd = NewParams->end();
2187 NewParam != NewParamEnd; ++NewParam) {
2188 // Variables used to diagnose redundant default arguments
2189 bool RedundantDefaultArg = false;
2190 SourceLocation OldDefaultLoc;
2191 SourceLocation NewDefaultLoc;
2192
2193 // Variable used to diagnose missing default arguments
2194 bool MissingDefaultArg = false;
2195
2196 // Variable used to diagnose non-final parameter packs
2197 bool SawParameterPack = false;
2198
2199 if (TemplateTypeParmDecl *NewTypeParm
2200 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
2201 // Check the presence of a default argument here.
2202 if (NewTypeParm->hasDefaultArgument() &&
2203 DiagnoseDefaultTemplateArgument(*this, TPC,
2204 NewTypeParm->getLocation(),
2205 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
2206 .getSourceRange()))
2207 NewTypeParm->removeDefaultArgument();
2208
2209 // Merge default arguments for template type parameters.
2210 TemplateTypeParmDecl *OldTypeParm
2211 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr;
2212 if (NewTypeParm->isParameterPack()) {
2213 assert(!NewTypeParm->hasDefaultArgument() &&((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2214, __PRETTY_FUNCTION__))
2214 "Parameter packs can't have a default argument!")((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2214, __PRETTY_FUNCTION__))
;
2215 SawParameterPack = true;
2216 } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) &&
2217 NewTypeParm->hasDefaultArgument() &&
2218 (!SkipBody || !SkipBody->ShouldSkip)) {
2219 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
2220 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
2221 SawDefaultArgument = true;
2222 RedundantDefaultArg = true;
2223 PreviousDefaultArgLoc = NewDefaultLoc;
2224 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
2225 // Merge the default argument from the old declaration to the
2226 // new declaration.
2227 NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm);
2228 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
2229 } else if (NewTypeParm->hasDefaultArgument()) {
2230 SawDefaultArgument = true;
2231 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
2232 } else if (SawDefaultArgument)
2233 MissingDefaultArg = true;
2234 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
2235 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
2236 // Check for unexpanded parameter packs.
2237 if (!NewNonTypeParm->isParameterPack() &&
2238 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
2239 NewNonTypeParm->getTypeSourceInfo(),
2240 UPPC_NonTypeTemplateParameterType)) {
2241 Invalid = true;
2242 continue;
2243 }
2244
2245 // Check the presence of a default argument here.
2246 if (NewNonTypeParm->hasDefaultArgument() &&
2247 DiagnoseDefaultTemplateArgument(*this, TPC,
2248 NewNonTypeParm->getLocation(),
2249 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
2250 NewNonTypeParm->removeDefaultArgument();
2251 }
2252
2253 // Merge default arguments for non-type template parameters
2254 NonTypeTemplateParmDecl *OldNonTypeParm
2255 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr;
2256 if (NewNonTypeParm->isParameterPack()) {
2257 assert(!NewNonTypeParm->hasDefaultArgument() &&((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2258, __PRETTY_FUNCTION__))
2258 "Parameter packs can't have a default argument!")((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2258, __PRETTY_FUNCTION__))
;
2259 if (!NewNonTypeParm->isPackExpansion())
2260 SawParameterPack = true;
2261 } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) &&
2262 NewNonTypeParm->hasDefaultArgument() &&
2263 (!SkipBody || !SkipBody->ShouldSkip)) {
2264 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
2265 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
2266 SawDefaultArgument = true;
2267 RedundantDefaultArg = true;
2268 PreviousDefaultArgLoc = NewDefaultLoc;
2269 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
2270 // Merge the default argument from the old declaration to the
2271 // new declaration.
2272 NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm);
2273 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
2274 } else if (NewNonTypeParm->hasDefaultArgument()) {
2275 SawDefaultArgument = true;
2276 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
2277 } else if (SawDefaultArgument)
2278 MissingDefaultArg = true;
2279 } else {
2280 TemplateTemplateParmDecl *NewTemplateParm
2281 = cast<TemplateTemplateParmDecl>(*NewParam);
2282
2283 // Check for unexpanded parameter packs, recursively.
2284 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
2285 Invalid = true;
2286 continue;
2287 }
2288
2289 // Check the presence of a default argument here.
2290 if (NewTemplateParm->hasDefaultArgument() &&
2291 DiagnoseDefaultTemplateArgument(*this, TPC,
2292 NewTemplateParm->getLocation(),
2293 NewTemplateParm->getDefaultArgument().getSourceRange()))
2294 NewTemplateParm->removeDefaultArgument();
2295
2296 // Merge default arguments for template template parameters
2297 TemplateTemplateParmDecl *OldTemplateParm
2298 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr;
2299 if (NewTemplateParm->isParameterPack()) {
2300 assert(!NewTemplateParm->hasDefaultArgument() &&((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2301, __PRETTY_FUNCTION__))
2301 "Parameter packs can't have a default argument!")((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2301, __PRETTY_FUNCTION__))
;
2302 if (!NewTemplateParm->isPackExpansion())
2303 SawParameterPack = true;
2304 } else if (OldTemplateParm &&
2305 hasVisibleDefaultArgument(OldTemplateParm) &&
2306 NewTemplateParm->hasDefaultArgument() &&
2307 (!SkipBody || !SkipBody->ShouldSkip)) {
2308 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
2309 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
2310 SawDefaultArgument = true;
2311 RedundantDefaultArg = true;
2312 PreviousDefaultArgLoc = NewDefaultLoc;
2313 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
2314 // Merge the default argument from the old declaration to the
2315 // new declaration.
2316 NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm);
2317 PreviousDefaultArgLoc
2318 = OldTemplateParm->getDefaultArgument().getLocation();
2319 } else if (NewTemplateParm->hasDefaultArgument()) {
2320 SawDefaultArgument = true;
2321 PreviousDefaultArgLoc
2322 = NewTemplateParm->getDefaultArgument().getLocation();
2323 } else if (SawDefaultArgument)
2324 MissingDefaultArg = true;
2325 }
2326
2327 // C++11 [temp.param]p11:
2328 // If a template parameter of a primary class template or alias template
2329 // is a template parameter pack, it shall be the last template parameter.
2330 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
2331 (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate ||
2332 TPC == TPC_TypeAliasTemplate)) {
2333 Diag((*NewParam)->getLocation(),
2334 diag::err_template_param_pack_must_be_last_template_parameter);
2335 Invalid = true;
2336 }
2337
2338 if (RedundantDefaultArg) {
2339 // C++ [temp.param]p12:
2340 // A template-parameter shall not be given default arguments
2341 // by two different declarations in the same scope.
2342 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
2343 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
2344 Invalid = true;
2345 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
2346 // C++ [temp.param]p11:
2347 // If a template-parameter of a class template has a default
2348 // template-argument, each subsequent template-parameter shall either
2349 // have a default template-argument supplied or be a template parameter
2350 // pack.
2351 Diag((*NewParam)->getLocation(),
2352 diag::err_template_param_default_arg_missing);
2353 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
2354 Invalid = true;
2355 RemoveDefaultArguments = true;
2356 }
2357
2358 // If we have an old template parameter list that we're merging
2359 // in, move on to the next parameter.
2360 if (OldParams)
2361 ++OldParam;
2362 }
2363
2364 // We were missing some default arguments at the end of the list, so remove
2365 // all of the default arguments.
2366 if (RemoveDefaultArguments) {
2367 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2368 NewParamEnd = NewParams->end();
2369 NewParam != NewParamEnd; ++NewParam) {
2370 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
2371 TTP->removeDefaultArgument();
2372 else if (NonTypeTemplateParmDecl *NTTP
2373 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
2374 NTTP->removeDefaultArgument();
2375 else
2376 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
2377 }
2378 }
2379
2380 return Invalid;
2381}
2382
2383namespace {
2384
2385/// A class which looks for a use of a certain level of template
2386/// parameter.
2387struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
2388 typedef RecursiveASTVisitor<DependencyChecker> super;
2389
2390 unsigned Depth;
2391
2392 // Whether we're looking for a use of a template parameter that makes the
2393 // overall construct type-dependent / a dependent type. This is strictly
2394 // best-effort for now; we may fail to match at all for a dependent type
2395 // in some cases if this is set.
2396 bool IgnoreNonTypeDependent;
2397
2398 bool Match;
2399 SourceLocation MatchLoc;
2400
2401 DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent)
2402 : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent),
2403 Match(false) {}
2404
2405 DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent)
2406 : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) {
2407 NamedDecl *ND = Params->getParam(0);
2408 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
2409 Depth = PD->getDepth();
2410 } else if (NonTypeTemplateParmDecl *PD =
2411 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
2412 Depth = PD->getDepth();
2413 } else {
2414 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
2415 }
2416 }
2417
2418 bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) {
2419 if (ParmDepth >= Depth) {
2420 Match = true;
2421 MatchLoc = Loc;
2422 return true;
2423 }
2424 return false;
2425 }
2426
2427 bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) {
2428 // Prune out non-type-dependent expressions if requested. This can
2429 // sometimes result in us failing to find a template parameter reference
2430 // (if a value-dependent expression creates a dependent type), but this
2431 // mode is best-effort only.
2432 if (auto *E = dyn_cast_or_null<Expr>(S))
2433 if (IgnoreNonTypeDependent && !E->isTypeDependent())
2434 return true;
2435 return super::TraverseStmt(S, Q);
2436 }
2437
2438 bool TraverseTypeLoc(TypeLoc TL) {
2439 if (IgnoreNonTypeDependent && !TL.isNull() &&
2440 !TL.getType()->isDependentType())
2441 return true;
2442 return super::TraverseTypeLoc(TL);
2443 }
2444
2445 bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
2446 return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc());
2447 }
2448
2449 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
2450 // For a best-effort search, keep looking until we find a location.
2451 return IgnoreNonTypeDependent || !Matches(T->getDepth());
2452 }
2453
2454 bool TraverseTemplateName(TemplateName N) {
2455 if (TemplateTemplateParmDecl *PD =
2456 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
2457 if (Matches(PD->getDepth()))
2458 return false;
2459 return super::TraverseTemplateName(N);
2460 }
2461
2462 bool VisitDeclRefExpr(DeclRefExpr *E) {
2463 if (NonTypeTemplateParmDecl *PD =
2464 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl()))
2465 if (Matches(PD->getDepth(), E->getExprLoc()))
2466 return false;
2467 return super::VisitDeclRefExpr(E);
2468 }
2469
2470 bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
2471 return TraverseType(T->getReplacementType());
2472 }
2473
2474 bool
2475 VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
2476 return TraverseTemplateArgument(T->getArgumentPack());
2477 }
2478
2479 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
2480 return TraverseType(T->getInjectedSpecializationType());
2481 }
2482};
2483} // end anonymous namespace
2484
2485/// Determines whether a given type depends on the given parameter
2486/// list.
2487static bool
2488DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
2489 DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false);
2490 Checker.TraverseType(T);
2491 return Checker.Match;
2492}
2493
2494// Find the source range corresponding to the named type in the given
2495// nested-name-specifier, if any.
2496static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
2497 QualType T,
2498 const CXXScopeSpec &SS) {
2499 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
2500 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
2501 if (const Type *CurType = NNS->getAsType()) {
2502 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
2503 return NNSLoc.getTypeLoc().getSourceRange();
2504 } else
2505 break;
2506
2507 NNSLoc = NNSLoc.getPrefix();
2508 }
2509
2510 return SourceRange();
2511}
2512
2513/// Match the given template parameter lists to the given scope
2514/// specifier, returning the template parameter list that applies to the
2515/// name.
2516///
2517/// \param DeclStartLoc the start of the declaration that has a scope
2518/// specifier or a template parameter list.
2519///
2520/// \param DeclLoc The location of the declaration itself.
2521///
2522/// \param SS the scope specifier that will be matched to the given template
2523/// parameter lists. This scope specifier precedes a qualified name that is
2524/// being declared.
2525///
2526/// \param TemplateId The template-id following the scope specifier, if there
2527/// is one. Used to check for a missing 'template<>'.
2528///
2529/// \param ParamLists the template parameter lists, from the outermost to the
2530/// innermost template parameter lists.
2531///
2532/// \param IsFriend Whether to apply the slightly different rules for
2533/// matching template parameters to scope specifiers in friend
2534/// declarations.
2535///
2536/// \param IsMemberSpecialization will be set true if the scope specifier
2537/// denotes a fully-specialized type, and therefore this is a declaration of
2538/// a member specialization.
2539///
2540/// \returns the template parameter list, if any, that corresponds to the
2541/// name that is preceded by the scope specifier @p SS. This template
2542/// parameter list may have template parameters (if we're declaring a
2543/// template) or may have no template parameters (if we're declaring a
2544/// template specialization), or may be NULL (if what we're declaring isn't
2545/// itself a template).
2546TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
2547 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
2548 TemplateIdAnnotation *TemplateId,
2549 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
2550 bool &IsMemberSpecialization, bool &Invalid) {
2551 IsMemberSpecialization = false;
2552 Invalid = false;
2553
2554 // The sequence of nested types to which we will match up the template
2555 // parameter lists. We first build this list by starting with the type named
2556 // by the nested-name-specifier and walking out until we run out of types.
2557 SmallVector<QualType, 4> NestedTypes;
2558 QualType T;
2559 if (SS.getScopeRep()) {
2560 if (CXXRecordDecl *Record
2561 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
2562 T = Context.getTypeDeclType(Record);
2563 else
2564 T = QualType(SS.getScopeRep()->getAsType(), 0);
2565 }
2566
2567 // If we found an explicit specialization that prevents us from needing
2568 // 'template<>' headers, this will be set to the location of that
2569 // explicit specialization.
2570 SourceLocation ExplicitSpecLoc;
2571
2572 while (!T.isNull()) {
2573 NestedTypes.push_back(T);
2574
2575 // Retrieve the parent of a record type.
2576 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2577 // If this type is an explicit specialization, we're done.
2578 if (ClassTemplateSpecializationDecl *Spec
2579 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2580 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
2581 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
2582 ExplicitSpecLoc = Spec->getLocation();
2583 break;
2584 }
2585 } else if (Record->getTemplateSpecializationKind()
2586 == TSK_ExplicitSpecialization) {
2587 ExplicitSpecLoc = Record->getLocation();
2588 break;
2589 }
2590
2591 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
2592 T = Context.getTypeDeclType(Parent);
2593 else
2594 T = QualType();
2595 continue;
2596 }
2597
2598 if (const TemplateSpecializationType *TST
2599 = T->getAs<TemplateSpecializationType>()) {
2600 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2601 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
2602 T = Context.getTypeDeclType(Parent);
2603 else
2604 T = QualType();
2605 continue;
2606 }
2607 }
2608
2609 // Look one step prior in a dependent template specialization type.
2610 if (const DependentTemplateSpecializationType *DependentTST
2611 = T->getAs<DependentTemplateSpecializationType>()) {
2612 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
2613 T = QualType(NNS->getAsType(), 0);
2614 else
2615 T = QualType();
2616 continue;
2617 }
2618
2619 // Look one step prior in a dependent name type.
2620 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
2621 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
2622 T = QualType(NNS->getAsType(), 0);
2623 else
2624 T = QualType();
2625 continue;
2626 }
2627
2628 // Retrieve the parent of an enumeration type.
2629 if (const EnumType *EnumT = T->getAs<EnumType>()) {
2630 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
2631 // check here.
2632 EnumDecl *Enum = EnumT->getDecl();
2633
2634 // Get to the parent type.
2635 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
2636 T = Context.getTypeDeclType(Parent);
2637 else
2638 T = QualType();
2639 continue;
2640 }
2641
2642 T = QualType();
2643 }
2644 // Reverse the nested types list, since we want to traverse from the outermost
2645 // to the innermost while checking template-parameter-lists.
2646 std::reverse(NestedTypes.begin(), NestedTypes.end());
2647
2648 // C++0x [temp.expl.spec]p17:
2649 // A member or a member template may be nested within many
2650 // enclosing class templates. In an explicit specialization for
2651 // such a member, the member declaration shall be preceded by a
2652 // template<> for each enclosing class template that is
2653 // explicitly specialized.
2654 bool SawNonEmptyTemplateParameterList = false;
2655
2656 auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) {
2657 if (SawNonEmptyTemplateParameterList) {
2658 Diag(DeclLoc, diag::err_specialize_member_of_template)
2659 << !Recovery << Range;
2660 Invalid = true;
2661 IsMemberSpecialization = false;
2662 return true;
2663 }
2664
2665 return false;
2666 };
2667
2668 auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) {
2669 // Check that we can have an explicit specialization here.
2670 if (CheckExplicitSpecialization(Range, true))
2671 return true;
2672
2673 // We don't have a template header, but we should.
2674 SourceLocation ExpectedTemplateLoc;
2675 if (!ParamLists.empty())
2676 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
2677 else
2678 ExpectedTemplateLoc = DeclStartLoc;
2679
2680 Diag(DeclLoc, diag::err_template_spec_needs_header)
2681 << Range
2682 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
2683 return false;
2684 };
2685
2686 unsigned ParamIdx = 0;
2687 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
2688 ++TypeIdx) {
2689 T = NestedTypes[TypeIdx];
2690
2691 // Whether we expect a 'template<>' header.
2692 bool NeedEmptyTemplateHeader = false;
2693
2694 // Whether we expect a template header with parameters.
2695 bool NeedNonemptyTemplateHeader = false;
2696
2697 // For a dependent type, the set of template parameters that we
2698 // expect to see.
2699 TemplateParameterList *ExpectedTemplateParams = nullptr;
2700
2701 // C++0x [temp.expl.spec]p15:
2702 // A member or a member template may be nested within many enclosing
2703 // class templates. In an explicit specialization for such a member, the
2704 // member declaration shall be preceded by a template<> for each
2705 // enclosing class template that is explicitly specialized.
2706 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2707 if (ClassTemplatePartialSpecializationDecl *Partial
2708 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2709 ExpectedTemplateParams = Partial->getTemplateParameters();
2710 NeedNonemptyTemplateHeader = true;
2711 } else if (Record->isDependentType()) {
2712 if (Record->getDescribedClassTemplate()) {
2713 ExpectedTemplateParams = Record->getDescribedClassTemplate()
2714 ->getTemplateParameters();
2715 NeedNonemptyTemplateHeader = true;
2716 }
2717 } else if (ClassTemplateSpecializationDecl *Spec
2718 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2719 // C++0x [temp.expl.spec]p4:
2720 // Members of an explicitly specialized class template are defined
2721 // in the same manner as members of normal classes, and not using
2722 // the template<> syntax.
2723 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
2724 NeedEmptyTemplateHeader = true;
2725 else
2726 continue;
2727 } else if (Record->getTemplateSpecializationKind()) {
2728 if (Record->getTemplateSpecializationKind()
2729 != TSK_ExplicitSpecialization &&
2730 TypeIdx == NumTypes - 1)
2731 IsMemberSpecialization = true;
2732
2733 continue;
2734 }
2735 } else if (const TemplateSpecializationType *TST
2736 = T->getAs<TemplateSpecializationType>()) {
2737 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2738 ExpectedTemplateParams = Template->getTemplateParameters();
2739 NeedNonemptyTemplateHeader = true;
2740 }
2741 } else if (T->getAs<DependentTemplateSpecializationType>()) {
2742 // FIXME: We actually could/should check the template arguments here
2743 // against the corresponding template parameter list.
2744 NeedNonemptyTemplateHeader = false;
2745 }
2746
2747 // C++ [temp.expl.spec]p16:
2748 // In an explicit specialization declaration for a member of a class
2749 // template or a member template that ap- pears in namespace scope, the
2750 // member template and some of its enclosing class templates may remain
2751 // unspecialized, except that the declaration shall not explicitly
2752 // specialize a class member template if its en- closing class templates
2753 // are not explicitly specialized as well.
2754 if (ParamIdx < ParamLists.size()) {
2755 if (ParamLists[ParamIdx]->size() == 0) {
2756 if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2757 false))
2758 return nullptr;
2759 } else
2760 SawNonEmptyTemplateParameterList = true;
2761 }
2762
2763 if (NeedEmptyTemplateHeader) {
2764 // If we're on the last of the types, and we need a 'template<>' header
2765 // here, then it's a member specialization.
2766 if (TypeIdx == NumTypes - 1)
2767 IsMemberSpecialization = true;
2768
2769 if (ParamIdx < ParamLists.size()) {
2770 if (ParamLists[ParamIdx]->size() > 0) {
2771 // The header has template parameters when it shouldn't. Complain.
2772 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2773 diag::err_template_param_list_matches_nontemplate)
2774 << T
2775 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
2776 ParamLists[ParamIdx]->getRAngleLoc())
2777 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2778 Invalid = true;
2779 return nullptr;
2780 }
2781
2782 // Consume this template header.
2783 ++ParamIdx;
2784 continue;
2785 }
2786
2787 if (!IsFriend)
2788 if (DiagnoseMissingExplicitSpecialization(
2789 getRangeOfTypeInNestedNameSpecifier(Context, T, SS)))
2790 return nullptr;
2791
2792 continue;
2793 }
2794
2795 if (NeedNonemptyTemplateHeader) {
2796 // In friend declarations we can have template-ids which don't
2797 // depend on the corresponding template parameter lists. But
2798 // assume that empty parameter lists are supposed to match this
2799 // template-id.
2800 if (IsFriend && T->isDependentType()) {
2801 if (ParamIdx < ParamLists.size() &&
2802 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
2803 ExpectedTemplateParams = nullptr;
2804 else
2805 continue;
2806 }
2807
2808 if (ParamIdx < ParamLists.size()) {
2809 // Check the template parameter list, if we can.
2810 if (ExpectedTemplateParams &&
2811 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
2812 ExpectedTemplateParams,
2813 true, TPL_TemplateMatch))
2814 Invalid = true;
2815
2816 if (!Invalid &&
2817 CheckTemplateParameterList(ParamLists[ParamIdx], nullptr,
2818 TPC_ClassTemplateMember))
2819 Invalid = true;
2820
2821 ++ParamIdx;
2822 continue;
2823 }
2824
2825 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
2826 << T
2827 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2828 Invalid = true;
2829 continue;
2830 }
2831 }
2832
2833 // If there were at least as many template-ids as there were template
2834 // parameter lists, then there are no template parameter lists remaining for
2835 // the declaration itself.
2836 if (ParamIdx >= ParamLists.size()) {
2837 if (TemplateId && !IsFriend) {
2838 // We don't have a template header for the declaration itself, but we
2839 // should.
2840 DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc,
2841 TemplateId->RAngleLoc));
2842
2843 // Fabricate an empty template parameter list for the invented header.
2844 return TemplateParameterList::Create(Context, SourceLocation(),
2845 SourceLocation(), None,
2846 SourceLocation(), nullptr);
2847 }
2848
2849 return nullptr;
2850 }
2851
2852 // If there were too many template parameter lists, complain about that now.
2853 if (ParamIdx < ParamLists.size() - 1) {
2854 bool HasAnyExplicitSpecHeader = false;
2855 bool AllExplicitSpecHeaders = true;
2856 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
2857 if (ParamLists[I]->size() == 0)
2858 HasAnyExplicitSpecHeader = true;
2859 else
2860 AllExplicitSpecHeaders = false;
2861 }
2862
2863 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2864 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
2865 : diag::err_template_spec_extra_headers)
2866 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
2867 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
2868
2869 // If there was a specialization somewhere, such that 'template<>' is
2870 // not required, and there were any 'template<>' headers, note where the
2871 // specialization occurred.
2872 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
2873 Diag(ExplicitSpecLoc,
2874 diag::note_explicit_template_spec_does_not_need_header)
2875 << NestedTypes.back();
2876
2877 // We have a template parameter list with no corresponding scope, which
2878 // means that the resulting template declaration can't be instantiated
2879 // properly (we'll end up with dependent nodes when we shouldn't).
2880 if (!AllExplicitSpecHeaders)
2881 Invalid = true;
2882 }
2883
2884 // C++ [temp.expl.spec]p16:
2885 // In an explicit specialization declaration for a member of a class
2886 // template or a member template that ap- pears in namespace scope, the
2887 // member template and some of its enclosing class templates may remain
2888 // unspecialized, except that the declaration shall not explicitly
2889 // specialize a class member template if its en- closing class templates
2890 // are not explicitly specialized as well.
2891 if (ParamLists.back()->size() == 0 &&
2892 CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2893 false))
2894 return nullptr;
2895
2896 // Return the last template parameter list, which corresponds to the
2897 // entity being declared.
2898 return ParamLists.back();
2899}
2900
2901void Sema::NoteAllFoundTemplates(TemplateName Name) {
2902 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
2903 Diag(Template->getLocation(), diag::note_template_declared_here)
2904 << (isa<FunctionTemplateDecl>(Template)
2905 ? 0
2906 : isa<ClassTemplateDecl>(Template)
2907 ? 1
2908 : isa<VarTemplateDecl>(Template)
2909 ? 2
2910 : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4)
2911 << Template->getDeclName();
2912 return;
2913 }
2914
2915 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
2916 for (OverloadedTemplateStorage::iterator I = OST->begin(),
2917 IEnd = OST->end();
2918 I != IEnd; ++I)
2919 Diag((*I)->getLocation(), diag::note_template_declared_here)
2920 << 0 << (*I)->getDeclName();
2921
2922 return;
2923 }
2924}
2925
2926static QualType
2927checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD,
2928 const SmallVectorImpl<TemplateArgument> &Converted,
2929 SourceLocation TemplateLoc,
2930 TemplateArgumentListInfo &TemplateArgs) {
2931 ASTContext &Context = SemaRef.getASTContext();
2932 switch (BTD->getBuiltinTemplateKind()) {
2933 case BTK__make_integer_seq: {
2934 // Specializations of __make_integer_seq<S, T, N> are treated like
2935 // S<T, 0, ..., N-1>.
2936
2937 // C++14 [inteseq.intseq]p1:
2938 // T shall be an integer type.
2939 if (!Converted[1].getAsType()->isIntegralType(Context)) {
2940 SemaRef.Diag(TemplateArgs[1].getLocation(),
2941 diag::err_integer_sequence_integral_element_type);
2942 return QualType();
2943 }
2944
2945 // C++14 [inteseq.make]p1:
2946 // If N is negative the program is ill-formed.
2947 TemplateArgument NumArgsArg = Converted[2];
2948 llvm::APSInt NumArgs = NumArgsArg.getAsIntegral();
2949 if (NumArgs < 0) {
2950 SemaRef.Diag(TemplateArgs[2].getLocation(),
2951 diag::err_integer_sequence_negative_length);
2952 return QualType();
2953 }
2954
2955 QualType ArgTy = NumArgsArg.getIntegralType();
2956 TemplateArgumentListInfo SyntheticTemplateArgs;
2957 // The type argument gets reused as the first template argument in the
2958 // synthetic template argument list.
2959 SyntheticTemplateArgs.addArgument(TemplateArgs[1]);
2960 // Expand N into 0 ... N-1.
2961 for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned());
2962 I < NumArgs; ++I) {
2963 TemplateArgument TA(Context, I, ArgTy);
2964 SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc(
2965 TA, ArgTy, TemplateArgs[2].getLocation()));
2966 }
2967 // The first template argument will be reused as the template decl that
2968 // our synthetic template arguments will be applied to.
2969 return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(),
2970 TemplateLoc, SyntheticTemplateArgs);
2971 }
2972
2973 case BTK__type_pack_element:
2974 // Specializations of
2975 // __type_pack_element<Index, T_1, ..., T_N>
2976 // are treated like T_Index.
2977 assert(Converted.size() == 2 &&((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2978, __PRETTY_FUNCTION__))
2978 "__type_pack_element should be given an index and a parameter pack")((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2978, __PRETTY_FUNCTION__))
;
2979
2980 // If the Index is out of bounds, the program is ill-formed.
2981 TemplateArgument IndexArg = Converted[0], Ts = Converted[1];
2982 llvm::APSInt Index = IndexArg.getAsIntegral();
2983 assert(Index >= 0 && "the index used with __type_pack_element should be of "((Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? static_cast
<void> (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2984, __PRETTY_FUNCTION__))
2984 "type std::size_t, and hence be non-negative")((Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? static_cast
<void> (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2984, __PRETTY_FUNCTION__))
;
2985 if (Index >= Ts.pack_size()) {
2986 SemaRef.Diag(TemplateArgs[0].getLocation(),
2987 diag::err_type_pack_element_out_of_bounds);
2988 return QualType();
2989 }
2990
2991 // We simply return the type at index `Index`.
2992 auto Nth = std::next(Ts.pack_begin(), Index.getExtValue());
2993 return Nth->getAsType();
2994 }
2995 llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2995)
;
2996}
2997
2998/// Determine whether this alias template is "enable_if_t".
2999static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) {
3000 return AliasTemplate->getName().equals("enable_if_t");
3001}
3002
3003/// Collect all of the separable terms in the given condition, which
3004/// might be a conjunction.
3005///
3006/// FIXME: The right answer is to convert the logical expression into
3007/// disjunctive normal form, so we can find the first failed term
3008/// within each possible clause.
3009static void collectConjunctionTerms(Expr *Clause,
3010 SmallVectorImpl<Expr *> &Terms) {
3011 if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) {
3012 if (BinOp->getOpcode() == BO_LAnd) {
3013 collectConjunctionTerms(BinOp->getLHS(), Terms);
3014 collectConjunctionTerms(BinOp->getRHS(), Terms);
3015 }
3016
3017 return;
3018 }
3019
3020 Terms.push_back(Clause);
3021}
3022
3023// The ranges-v3 library uses an odd pattern of a top-level "||" with
3024// a left-hand side that is value-dependent but never true. Identify
3025// the idiom and ignore that term.
3026static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) {
3027 // Top-level '||'.
3028 auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts());
3029 if (!BinOp) return Cond;
3030
3031 if (BinOp->getOpcode() != BO_LOr) return Cond;
3032
3033 // With an inner '==' that has a literal on the right-hand side.
3034 Expr *LHS = BinOp->getLHS();
3035 auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts());
3036 if (!InnerBinOp) return Cond;
3037
3038 if (InnerBinOp->getOpcode() != BO_EQ ||
3039 !isa<IntegerLiteral>(InnerBinOp->getRHS()))
3040 return Cond;
3041
3042 // If the inner binary operation came from a macro expansion named
3043 // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side
3044 // of the '||', which is the real, user-provided condition.
3045 SourceLocation Loc = InnerBinOp->getExprLoc();
3046 if (!Loc.isMacroID()) return Cond;
3047
3048 StringRef MacroName = PP.getImmediateMacroName(Loc);
3049 if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_")
3050 return BinOp->getRHS();
3051
3052 return Cond;
3053}
3054
3055std::pair<Expr *, std::string>
3056Sema::findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond) {
3057 Cond = lookThroughRangesV3Condition(PP, Cond);
3058
3059 // Separate out all of the terms in a conjunction.
3060 SmallVector<Expr *, 4> Terms;
3061 collectConjunctionTerms(Cond, Terms);
3062
3063 // Determine which term failed.
3064 Expr *FailedCond = nullptr;
3065 for (Expr *Term : Terms) {
3066 Expr *TermAsWritten = Term->IgnoreParenImpCasts();
3067
3068 // Literals are uninteresting.
3069 if (isa<CXXBoolLiteralExpr>(TermAsWritten) ||
3070 isa<IntegerLiteral>(TermAsWritten))
3071 continue;
3072
3073 // The initialization of the parameter from the argument is
3074 // a constant-evaluated context.
3075 EnterExpressionEvaluationContext ConstantEvaluated(
3076 *this, Sema::ExpressionEvaluationContext::ConstantEvaluated);
3077
3078 bool Succeeded;
3079 if (Term->EvaluateAsBooleanCondition(Succeeded, Context) &&
3080 !Succeeded) {
3081 FailedCond = TermAsWritten;
3082 break;
3083 }
3084 }
3085
3086 if (!FailedCond) {
3087 if (!AllowTopLevelCond)
3088 return { nullptr, "" };
3089
3090 FailedCond = Cond->IgnoreParenImpCasts();
3091 }
3092
3093 std::string Description;
3094 {
3095 llvm::raw_string_ostream Out(Description);
3096 FailedCond->printPretty(Out, nullptr, getPrintingPolicy());
3097 }
3098 return { FailedCond, Description };
3099}
3100
3101QualType Sema::CheckTemplateIdType(TemplateName Name,
3102 SourceLocation TemplateLoc,
3103 TemplateArgumentListInfo &TemplateArgs) {
3104 DependentTemplateName *DTN
3105 = Name.getUnderlying().getAsDependentTemplateName();
3106 if (DTN && DTN->isIdentifier())
3107 // When building a template-id where the template-name is dependent,
3108 // assume the template is a type template. Either our assumption is
3109 // correct, or the code is ill-formed and will be diagnosed when the
3110 // dependent name is substituted.
3111 return Context.getDependentTemplateSpecializationType(ETK_None,
3112 DTN->getQualifier(),
3113 DTN->getIdentifier(),
3114 TemplateArgs);
3115
3116 TemplateDecl *Template = Name.getAsTemplateDecl();
3117 if (!Template || isa<FunctionTemplateDecl>(Template) ||
3118 isa<VarTemplateDecl>(Template)) {
3119 // We might have a substituted template template parameter pack. If so,
3120 // build a template specialization type for it.
3121 if (Name.getAsSubstTemplateTemplateParmPack())
3122 return Context.getTemplateSpecializationType(Name, TemplateArgs);
3123
3124 Diag(TemplateLoc, diag::err_template_id_not_a_type)
3125 << Name;
3126 NoteAllFoundTemplates(Name);
3127 return QualType();
3128 }
3129
3130 // Check that the template argument list is well-formed for this
3131 // template.
3132 SmallVector<TemplateArgument, 4> Converted;
3133 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
3134 false, Converted))
3135 return QualType();
3136
3137 QualType CanonType;
3138
3139 bool InstantiationDependent = false;
3140 if (TypeAliasTemplateDecl *AliasTemplate =
3141 dyn_cast<TypeAliasTemplateDecl>(Template)) {
3142 // Find the canonical type for this type alias template specialization.
3143 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
3144 if (Pattern->isInvalidDecl())
3145 return QualType();
3146
3147 TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack,
3148 Converted);
3149
3150 // Only substitute for the innermost template argument list.
3151 MultiLevelTemplateArgumentList TemplateArgLists;
3152 TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs);
3153 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
3154 for (unsigned I = 0; I < Depth; ++I)
3155 TemplateArgLists.addOuterTemplateArguments(None);
3156
3157 LocalInstantiationScope Scope(*this);
3158 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
3159 if (Inst.isInvalid())
3160 return QualType();
3161
3162 CanonType = SubstType(Pattern->getUnderlyingType(),
3163 TemplateArgLists, AliasTemplate->getLocation(),
3164 AliasTemplate->getDeclName());
3165 if (CanonType.isNull()) {
3166 // If this was enable_if and we failed to find the nested type
3167 // within enable_if in a SFINAE context, dig out the specific
3168 // enable_if condition that failed and present that instead.
3169 if (isEnableIfAliasTemplate(AliasTemplate)) {
3170 if (auto DeductionInfo = isSFINAEContext()) {
3171 if (*DeductionInfo &&
3172 (*DeductionInfo)->hasSFINAEDiagnostic() &&
3173 (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() ==
3174 diag::err_typename_nested_not_found_enable_if &&
3175 TemplateArgs[0].getArgument().getKind()
3176 == TemplateArgument::Expression) {
3177 Expr *FailedCond;
3178 std::string FailedDescription;
3179 std::tie(FailedCond, FailedDescription) =
3180 findFailedBooleanCondition(
3181 TemplateArgs[0].getSourceExpression(),
3182 /*AllowTopLevelCond=*/true);
3183
3184 // Remove the old SFINAE diagnostic.
3185 PartialDiagnosticAt OldDiag =
3186 {SourceLocation(), PartialDiagnostic::NullDiagnostic()};
3187 (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag);
3188
3189 // Add a new SFINAE diagnostic specifying which condition
3190 // failed.
3191 (*DeductionInfo)->addSFINAEDiagnostic(
3192 OldDiag.first,
3193 PDiag(diag::err_typename_nested_not_found_requirement)
3194 << FailedDescription
3195 << FailedCond->getSourceRange());
3196 }
3197 }
3198 }
3199
3200 return QualType();
3201 }
3202 } else if (Name.isDependent() ||
3203 TemplateSpecializationType::anyDependentTemplateArguments(
3204 TemplateArgs, InstantiationDependent)) {
3205 // This class template specialization is a dependent
3206 // type. Therefore, its canonical type is another class template
3207 // specialization type that contains all of the converted
3208 // arguments in canonical form. This ensures that, e.g., A<T> and
3209 // A<T, T> have identical types when A is declared as:
3210 //
3211 // template<typename T, typename U = T> struct A;
3212 CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted);
3213
3214 // This might work out to be a current instantiation, in which
3215 // case the canonical type needs to be the InjectedClassNameType.
3216 //
3217 // TODO: in theory this could be a simple hashtable lookup; most
3218 // changes to CurContext don't change the set of current
3219 // instantiations.
3220 if (isa<ClassTemplateDecl>(Template)) {
3221 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
3222 // If we get out to a namespace, we're done.
3223 if (Ctx->isFileContext()) break;
3224
3225 // If this isn't a record, keep looking.
3226 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
3227 if (!Record) continue;
3228
3229 // Look for one of the two cases with InjectedClassNameTypes
3230 // and check whether it's the same template.
3231 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
3232 !Record->getDescribedClassTemplate())
3233 continue;
3234
3235 // Fetch the injected class name type and check whether its
3236 // injected type is equal to the type we just built.
3237 QualType ICNT = Context.getTypeDeclType(Record);
3238 QualType Injected = cast<InjectedClassNameType>(ICNT)
3239 ->getInjectedSpecializationType();
3240
3241 if (CanonType != Injected->getCanonicalTypeInternal())
3242 continue;
3243
3244 // If so, the canonical type of this TST is the injected
3245 // class name type of the record we just found.
3246 assert(ICNT.isCanonical())((ICNT.isCanonical()) ? static_cast<void> (0) : __assert_fail
("ICNT.isCanonical()", "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3246, __PRETTY_FUNCTION__))
;
3247 CanonType = ICNT;
3248 break;
3249 }
3250 }
3251 } else if (ClassTemplateDecl *ClassTemplate
3252 = dyn_cast<ClassTemplateDecl>(Template)) {
3253 // Find the class template specialization declaration that
3254 // corresponds to these arguments.
3255 void *InsertPos = nullptr;
3256 ClassTemplateSpecializationDecl *Decl
3257 = ClassTemplate->findSpecialization(Converted, InsertPos);
3258 if (!Decl) {
3259 // This is the first time we have referenced this class template
3260 // specialization. Create the canonical declaration and add it to
3261 // the set of specializations.
3262 Decl = ClassTemplateSpecializationDecl::Create(
3263 Context, ClassTemplate->getTemplatedDecl()->getTagKind(),
3264 ClassTemplate->getDeclContext(),
3265 ClassTemplate->getTemplatedDecl()->getBeginLoc(),
3266 ClassTemplate->getLocation(), ClassTemplate, Converted, nullptr);
3267 ClassTemplate->AddSpecialization(Decl, InsertPos);
3268 if (ClassTemplate->isOutOfLine())
3269 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
3270 }
3271
3272 if (Decl->getSpecializationKind() == TSK_Undeclared) {
3273 MultiLevelTemplateArgumentList TemplateArgLists;
3274 TemplateArgLists.addOuterTemplateArguments(Converted);
3275 InstantiateAttrsForDecl(TemplateArgLists, ClassTemplate->getTemplatedDecl(),
3276 Decl);
3277 }
3278
3279 // Diagnose uses of this specialization.
3280 (void)DiagnoseUseOfDecl(Decl, TemplateLoc);
3281
3282 CanonType = Context.getTypeDeclType(Decl);
3283 assert(isa<RecordType>(CanonType) &&((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType"
) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3284, __PRETTY_FUNCTION__))
3284 "type of non-dependent specialization is not a RecordType")((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType"
) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3284, __PRETTY_FUNCTION__))
;
3285 } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) {
3286 CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc,
3287 TemplateArgs);
3288 }
3289
3290 // Build the fully-sugared type for this class template
3291 // specialization, which refers back to the class template
3292 // specialization we created or found.
3293 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
3294}
3295
3296TypeResult
3297Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
3298 TemplateTy TemplateD, IdentifierInfo *TemplateII,
3299 SourceLocation TemplateIILoc,
3300 SourceLocation LAngleLoc,
3301 ASTTemplateArgsPtr TemplateArgsIn,
3302 SourceLocation RAngleLoc,
3303 bool IsCtorOrDtorName, bool IsClassName) {
3304 if (SS.isInvalid())
3305 return true;
3306
3307 if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) {
3308 DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false);
3309
3310 // C++ [temp.res]p3:
3311 // A qualified-id that refers to a type and in which the
3312 // nested-name-specifier depends on a template-parameter (14.6.2)
3313 // shall be prefixed by the keyword typename to indicate that the
3314 // qualified-id denotes a type, forming an
3315 // elaborated-type-specifier (7.1.5.3).
3316 if (!LookupCtx && isDependentScopeSpecifier(SS)) {
3317 Diag(SS.getBeginLoc(), diag::err_typename_missing_template)
3318 << SS.getScopeRep() << TemplateII->getName();
3319 // Recover as if 'typename' were specified.
3320 // FIXME: This is not quite correct recovery as we don't transform SS
3321 // into the corresponding dependent form (and we don't diagnose missing
3322 // 'template' keywords within SS as a result).
3323 return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc,
3324 TemplateD, TemplateII, TemplateIILoc, LAngleLoc,
3325 TemplateArgsIn, RAngleLoc);
3326 }
3327
3328 // Per C++ [class.qual]p2, if the template-id was an injected-class-name,
3329 // it's not actually allowed to be used as a type in most cases. Because
3330 // we annotate it before we know whether it's valid, we have to check for
3331 // this case here.
3332 auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx);
3333 if (LookupRD && LookupRD->getIdentifier() == TemplateII) {
3334 Diag(TemplateIILoc,
3335 TemplateKWLoc.isInvalid()
3336 ? diag::err_out_of_line_qualified_id_type_names_constructor
3337 : diag::ext_out_of_line_qualified_id_type_names_constructor)
3338 << TemplateII << 0 /*injected-class-name used as template name*/
3339 << 1 /*if any keyword was present, it was 'template'*/;
3340 }
3341 }
3342
3343 TemplateName Template = TemplateD.get();
3344
3345 // Translate the parser's template argument list in our AST format.
3346 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3347 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3348
3349 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3350 QualType T
3351 = Context.getDependentTemplateSpecializationType(ETK_None,
3352 DTN->getQualifier(),
3353 DTN->getIdentifier(),
3354 TemplateArgs);
3355 // Build type-source information.
3356 TypeLocBuilder TLB;
3357 DependentTemplateSpecializationTypeLoc SpecTL
3358 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3359 SpecTL.setElaboratedKeywordLoc(SourceLocation());
3360 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3361 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3362 SpecTL.setTemplateNameLoc(TemplateIILoc);
3363 SpecTL.setLAngleLoc(LAngleLoc);
3364 SpecTL.setRAngleLoc(RAngleLoc);
3365 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3366 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3367 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3368 }
3369
3370 QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs);
3371 if (Result.isNull())
3372 return true;
3373
3374 // Build type-source information.
3375 TypeLocBuilder TLB;
3376 TemplateSpecializationTypeLoc SpecTL
3377 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3378 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3379 SpecTL.setTemplateNameLoc(TemplateIILoc);
3380 SpecTL.setLAngleLoc(LAngleLoc);
3381 SpecTL.setRAngleLoc(RAngleLoc);
3382 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3383 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3384
3385 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
3386 // constructor or destructor name (in such a case, the scope specifier
3387 // will be attached to the enclosing Decl or Expr node).
3388 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
3389 // Create an elaborated-type-specifier containing the nested-name-specifier.
3390 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
3391 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3392 ElabTL.setElaboratedKeywordLoc(SourceLocation());
3393 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3394 }
3395
3396 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3397}
3398
3399TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
3400 TypeSpecifierType TagSpec,
3401 SourceLocation TagLoc,
3402 CXXScopeSpec &SS,
3403 SourceLocation TemplateKWLoc,
3404 TemplateTy TemplateD,
3405 SourceLocation TemplateLoc,
3406 SourceLocation LAngleLoc,
3407 ASTTemplateArgsPtr TemplateArgsIn,
3408 SourceLocation RAngleLoc) {
3409 TemplateName Template = TemplateD.get();
3410
3411 // Translate the parser's template argument list in our AST format.
3412 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3413 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3414
3415 // Determine the tag kind
3416 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
3417 ElaboratedTypeKeyword Keyword
3418 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
3419
3420 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3421 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
3422 DTN->getQualifier(),
3423 DTN->getIdentifier(),
3424 TemplateArgs);
3425
3426 // Build type-source information.
3427 TypeLocBuilder TLB;
3428 DependentTemplateSpecializationTypeLoc SpecTL
3429 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3430 SpecTL.setElaboratedKeywordLoc(TagLoc);
3431 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3432 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3433 SpecTL.setTemplateNameLoc(TemplateLoc);
3434 SpecTL.setLAngleLoc(LAngleLoc);
3435 SpecTL.setRAngleLoc(RAngleLoc);
3436 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3437 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3438 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3439 }
3440
3441 if (TypeAliasTemplateDecl *TAT =
3442 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
3443 // C++0x [dcl.type.elab]p2:
3444 // If the identifier resolves to a typedef-name or the simple-template-id
3445 // resolves to an alias template specialization, the
3446 // elaborated-type-specifier is ill-formed.
3447 Diag(TemplateLoc, diag::err_tag_reference_non_tag)
3448 << TAT << NTK_TypeAliasTemplate << TagKind;
3449 Diag(TAT->getLocation(), diag::note_declared_at);
3450 }
3451
3452 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
3453 if (Result.isNull())
3454 return TypeResult(true);
3455
3456 // Check the tag kind
3457 if (const RecordType *RT = Result->getAs<RecordType>()) {
3458 RecordDecl *D = RT->getDecl();
3459
3460 IdentifierInfo *Id = D->getIdentifier();
3461 assert(Id && "templated class must have an identifier")((Id && "templated class must have an identifier") ? static_cast
<void> (0) : __assert_fail ("Id && \"templated class must have an identifier\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3461, __PRETTY_FUNCTION__))
;
3462
3463 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
3464 TagLoc, Id)) {
3465 Diag(TagLoc, diag::err_use_with_wrong_tag)
3466 << Result
3467 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
3468 Diag(D->getLocation(), diag::note_previous_use);
3469 }
3470 }
3471
3472 // Provide source-location information for the template specialization.
3473 TypeLocBuilder TLB;
3474 TemplateSpecializationTypeLoc SpecTL
3475 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3476 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3477 SpecTL.setTemplateNameLoc(TemplateLoc);
3478 SpecTL.setLAngleLoc(LAngleLoc);
3479 SpecTL.setRAngleLoc(RAngleLoc);
3480 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3481 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3482
3483 // Construct an elaborated type containing the nested-name-specifier (if any)
3484 // and tag keyword.
3485 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
3486 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3487 ElabTL.setElaboratedKeywordLoc(TagLoc);
3488 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3489 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3490}
3491
3492static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized,
3493 NamedDecl *PrevDecl,
3494 SourceLocation Loc,
3495 bool IsPartialSpecialization);
3496
3497static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D);
3498
3499static bool isTemplateArgumentTemplateParameter(
3500 const TemplateArgument &Arg, unsigned Depth, unsigned Index) {
3501 switch (Arg.getKind()) {
3502 case TemplateArgument::Null:
3503 case TemplateArgument::NullPtr:
3504 case TemplateArgument::Integral:
3505 case TemplateArgument::Declaration:
3506 case TemplateArgument::Pack:
3507 case TemplateArgument::TemplateExpansion:
3508 return false;
3509
3510 case TemplateArgument::Type: {
3511 QualType Type = Arg.getAsType();
3512 const TemplateTypeParmType *TPT =
3513 Arg.getAsType()->getAs<TemplateTypeParmType>();
3514 return TPT && !Type.hasQualifiers() &&
3515 TPT->getDepth() == Depth && TPT->getIndex() == Index;
3516 }
3517
3518 case TemplateArgument::Expression: {
3519 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr());
3520 if (!DRE || !DRE->getDecl())
3521 return false;
3522 const NonTypeTemplateParmDecl *NTTP =
3523 dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
3524 return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index;
3525 }
3526
3527 case TemplateArgument::Template:
3528 const TemplateTemplateParmDecl *TTP =
3529 dyn_cast_or_null<TemplateTemplateParmDecl>(
3530 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl());
3531 return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index;
3532 }
3533 llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3533)
;
3534}
3535
3536static bool isSameAsPrimaryTemplate(TemplateParameterList *Params,
3537 ArrayRef<TemplateArgument> Args) {
3538 if (Params->size() != Args.size())
3539 return false;
3540
3541 unsigned Depth = Params->getDepth();
3542
3543 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3544 TemplateArgument Arg = Args[I];
3545
3546 // If the parameter is a pack expansion, the argument must be a pack
3547 // whose only element is a pack expansion.
3548 if (Params->getParam(I)->isParameterPack()) {
3549 if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 ||
3550 !Arg.pack_begin()->isPackExpansion())
3551 return false;
3552 Arg = Arg.pack_begin()->getPackExpansionPattern();
3553 }
3554
3555 if (!isTemplateArgumentTemplateParameter(Arg, Depth, I))
3556 return false;
3557 }
3558
3559 return true;
3560}
3561
3562/// Convert the parser's template argument list representation into our form.
3563static TemplateArgumentListInfo
3564makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) {
3565 TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc,
3566 TemplateId.RAngleLoc);
3567 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(),
3568 TemplateId.NumArgs);
3569 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
3570 return TemplateArgs;
3571}
3572
3573template<typename PartialSpecDecl>
3574static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) {
3575 if (Partial->getDeclContext()->isDependentContext())
3576 return;
3577
3578 // FIXME: Get the TDK from deduction in order to provide better diagnostics
3579 // for non-substitution-failure issues?
3580 TemplateDeductionInfo Info(Partial->getLocation());
3581 if (S.isMoreSpecializedThanPrimary(Partial, Info))
3582 return;
3583
3584 auto *Template = Partial->getSpecializedTemplate();
3585 S.Diag(Partial->getLocation(),
3586 diag::ext_partial_spec_not_more_specialized_than_primary)
3587 << isa<VarTemplateDecl>(Template);
3588
3589 if (Info.hasSFINAEDiagnostic()) {
3590 PartialDiagnosticAt Diag = {SourceLocation(),
3591 PartialDiagnostic::NullDiagnostic()};
3592 Info.takeSFINAEDiagnostic(Diag);
3593 SmallString<128> SFINAEArgString;
3594 Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString);
3595 S.Diag(Diag.first,
3596 diag::note_partial_spec_not_more_specialized_than_primary)
3597 << SFINAEArgString;
3598 }
3599
3600 S.Diag(Template->getLocation(), diag::note_template_decl_here);
3601}
3602
3603static void
3604noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams,
3605 const llvm::SmallBitVector &DeducibleParams) {
3606 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
3607 if (!DeducibleParams[I]) {
3608 NamedDecl *Param = TemplateParams->getParam(I);
3609 if (Param->getDeclName())
3610 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3611 << Param->getDeclName();
3612 else
3613 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3614 << "(anonymous)";
3615 }
3616 }
3617}
3618
3619
3620template<typename PartialSpecDecl>
3621static void checkTemplatePartialSpecialization(Sema &S,
3622 PartialSpecDecl *Partial) {
3623 // C++1z [temp.class.spec]p8: (DR1495)
3624 // - The specialization shall be more specialized than the primary
3625 // template (14.5.5.2).
3626 checkMoreSpecializedThanPrimary(S, Partial);
3627
3628 // C++ [temp.class.spec]p8: (DR1315)
3629 // - Each template-parameter shall appear at least once in the
3630 // template-id outside a non-deduced context.
3631 // C++1z [temp.class.spec.match]p3 (P0127R2)
3632 // If the template arguments of a partial specialization cannot be
3633 // deduced because of the structure of its template-parameter-list
3634 // and the template-id, the program is ill-formed.
3635 auto *TemplateParams = Partial->getTemplateParameters();
3636 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3637 S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
3638 TemplateParams->getDepth(), DeducibleParams);
3639
3640 if (!DeducibleParams.all()) {
3641 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3642 S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible)
3643 << isa<VarTemplatePartialSpecializationDecl>(Partial)
3644 << (NumNonDeducible > 1)
3645 << SourceRange(Partial->getLocation(),
3646 Partial->getTemplateArgsAsWritten()->RAngleLoc);
3647 noteNonDeducibleParameters(S, TemplateParams, DeducibleParams);
3648 }
3649}
3650
3651void Sema::CheckTemplatePartialSpecialization(
3652 ClassTemplatePartialSpecializationDecl *Partial) {
3653 checkTemplatePartialSpecialization(*this, Partial);
3654}
3655
3656void Sema::CheckTemplatePartialSpecialization(
3657 VarTemplatePartialSpecializationDecl *Partial) {
3658 checkTemplatePartialSpecialization(*this, Partial);
3659}
3660
3661void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) {
3662 // C++1z [temp.param]p11:
3663 // A template parameter of a deduction guide template that does not have a
3664 // default-argument shall be deducible from the parameter-type-list of the
3665 // deduction guide template.
3666 auto *TemplateParams = TD->getTemplateParameters();
3667 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3668 MarkDeducedTemplateParameters(TD, DeducibleParams);
3669 for (unsigned I = 0; I != TemplateParams->size(); ++I) {
3670 // A parameter pack is deducible (to an empty pack).
3671 auto *Param = TemplateParams->getParam(I);
3672 if (Param->isParameterPack() || hasVisibleDefaultArgument(Param))
3673 DeducibleParams[I] = true;
3674 }
3675
3676 if (!DeducibleParams.all()) {
3677 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3678 Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible)
3679 << (NumNonDeducible > 1);
3680 noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams);
3681 }
3682}
3683
3684DeclResult Sema::ActOnVarTemplateSpecialization(
3685 Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc,
3686 TemplateParameterList *TemplateParams, StorageClass SC,
3687 bool IsPartialSpecialization) {
3688 // D must be variable template id.
3689 assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&
"Variable template specialization is declared with a template it."
) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3690, __PRETTY_FUNCTION__))
3690 "Variable template specialization is declared with a template it.")((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&
"Variable template specialization is declared with a template it."
) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3690, __PRETTY_FUNCTION__))
;
3691
3692 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
3693 TemplateArgumentListInfo TemplateArgs =
3694 makeTemplateArgumentListInfo(*this, *TemplateId);
3695 SourceLocation TemplateNameLoc = D.getIdentifierLoc();
3696 SourceLocation LAngleLoc = TemplateId->LAngleLoc;
3697 SourceLocation RAngleLoc = TemplateId->RAngleLoc;
3698
3699 TemplateName Name = TemplateId->Template.get();
3700
3701 // The template-id must name a variable template.
3702 VarTemplateDecl *VarTemplate =
3703 dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl());
3704 if (!VarTemplate) {
3705 NamedDecl *FnTemplate;
3706 if (auto *OTS = Name.getAsOverloadedTemplate())
3707 FnTemplate = *OTS->begin();
3708 else
3709 FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl());
3710 if (FnTemplate)
3711 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method)
3712 << FnTemplate->getDeclName();
3713 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template)
3714 << IsPartialSpecialization;
3715 }
3716
3717 // Check for unexpanded parameter packs in any of the template arguments.
3718 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
3719 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
3720 UPPC_PartialSpecialization))
3721 return true;
3722
3723 // Check that the template argument list is well-formed for this
3724 // template.
3725 SmallVector<TemplateArgument, 4> Converted;
3726 if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs,
3727 false, Converted))
3728 return true;
3729
3730 // Find the variable template (partial) specialization declaration that
3731 // corresponds to these arguments.
3732 if (IsPartialSpecialization) {
3733 if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate,
3734 TemplateArgs.size(), Converted))
3735 return true;
3736
3737 // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we
3738 // also do them during instantiation.
3739 bool InstantiationDependent;
3740 if (!Name.isDependent() &&
3741 !TemplateSpecializationType::anyDependentTemplateArguments(
3742 TemplateArgs.arguments(),
3743 InstantiationDependent)) {
3744 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
3745 << VarTemplate->getDeclName();
3746 IsPartialSpecialization = false;
3747 }
3748
3749 if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(),
3750 Converted)) {
3751 // C++ [temp.class.spec]p9b3:
3752 //
3753 // -- The argument list of the specialization shall not be identical
3754 // to the implicit argument list of the primary template.
3755 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
3756 << /*variable template*/ 1
3757 << /*is definition*/(SC != SC_Extern && !CurContext->isRecord())
3758 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
3759 // FIXME: Recover from this by treating the declaration as a redeclaration
3760 // of the primary template.
3761 return true;
3762 }
3763 }
3764
3765 void *InsertPos = nullptr;
3766 VarTemplateSpecializationDecl *PrevDecl = nullptr;
3767
3768 if (IsPartialSpecialization)
3769 // FIXME: Template parameter list matters too
3770 PrevDecl = VarTemplate->findPartialSpecialization(Converted, InsertPos);
3771 else
3772 PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos);
3773
3774 VarTemplateSpecializationDecl *Specialization = nullptr;
3775
3776 // Check whether we can declare a variable template specialization in
3777 // the current scope.
3778 if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl,
3779 TemplateNameLoc,
3780 IsPartialSpecialization))
3781 return true;
3782
3783 if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) {
3784 // Since the only prior variable template specialization with these
3785 // arguments was referenced but not declared, reuse that
3786 // declaration node as our own, updating its source location and
3787 // the list of outer template parameters to reflect our new declaration.
3788 Specialization = PrevDecl;
3789 Specialization->setLocation(TemplateNameLoc);
3790 PrevDecl = nullptr;
3791 } else if (IsPartialSpecialization) {
3792 // Create a new class template partial specialization declaration node.
3793 VarTemplatePartialSpecializationDecl *PrevPartial =
3794 cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl);
3795 VarTemplatePartialSpecializationDecl *Partial =
3796 VarTemplatePartialSpecializationDecl::Create(
3797 Context, VarTemplate->getDeclContext(), TemplateKWLoc,
3798 TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC,
3799 Converted, TemplateArgs);
3800
3801 if (!PrevPartial)
3802 VarTemplate->AddPartialSpecialization(Partial, InsertPos);
3803 Specialization = Partial;
3804
3805 // If we are providing an explicit specialization of a member variable
3806 // template specialization, make a note of that.
3807 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
3808 PrevPartial->setMemberSpecialization();
3809
3810 CheckTemplatePartialSpecialization(Partial);
3811 } else {
3812 // Create a new class template specialization declaration node for
3813 // this explicit specialization or friend declaration.
3814 Specialization = VarTemplateSpecializationDecl::Create(
3815 Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc,
3816 VarTemplate, DI->getType(), DI, SC, Converted);
3817 Specialization->setTemplateArgsInfo(TemplateArgs);
3818
3819 if (!PrevDecl)
3820 VarTemplate->AddSpecialization(Specialization, InsertPos);
3821 }
3822
3823 // C++ [temp.expl.spec]p6:
3824 // If a template, a member template or the member of a class template is
3825 // explicitly specialized then that specialization shall be declared
3826 // before the first use of that specialization that would cause an implicit
3827 // instantiation to take place, in every translation unit in which such a
3828 // use occurs; no diagnostic is required.
3829 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
3830 bool Okay = false;
3831 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
3832 // Is there any previous explicit specialization declaration?
3833 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
3834 Okay = true;
3835 break;
3836 }
3837 }
3838
3839 if (!Okay) {
3840 SourceRange Range(TemplateNameLoc, RAngleLoc);
3841 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
3842 << Name << Range;
3843
3844 Diag(PrevDecl->getPointOfInstantiation(),
3845 diag::note_instantiation_required_here)
3846 << (PrevDecl->getTemplateSpecializationKind() !=
3847 TSK_ImplicitInstantiation);
3848 return true;
3849 }
3850 }
3851
3852 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
3853 Specialization->setLexicalDeclContext(CurContext);
3854
3855 // Add the specialization into its lexical context, so that it can
3856 // be seen when iterating through the list of declarations in that
3857 // context. However, specializations are not found by name lookup.
3858 CurContext->addDecl(Specialization);
3859
3860 // Note that this is an explicit specialization.
3861 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
3862
3863 if (PrevDecl) {
3864 // Check that this isn't a redefinition of this specialization,
3865 // merging with previous declarations.
3866 LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName,
3867 forRedeclarationInCurContext());
3868 PrevSpec.addDecl(PrevDecl);
3869 D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec));
3870 } else if (Specialization->isStaticDataMember() &&
3871 Specialization->isOutOfLine()) {
3872 Specialization->setAccess(VarTemplate->getAccess());
3873 }
3874
3875 // Link instantiations of static data members back to the template from
3876 // which they were instantiated.
3877 if (Specialization->isStaticDataMember())
3878 Specialization->setInstantiationOfStaticDataMember(
3879 VarTemplate->getTemplatedDecl(),
3880 Specialization->getSpecializationKind());
3881
3882 return Specialization;
3883}
3884
3885namespace {
3886/// A partial specialization whose template arguments have matched
3887/// a given template-id.
3888struct PartialSpecMatchResult {
3889 VarTemplatePartialSpecializationDecl *Partial;
3890 TemplateArgumentList *Args;
3891};
3892} // end anonymous namespace
3893
3894DeclResult
3895Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
3896 SourceLocation TemplateNameLoc,
3897 const TemplateArgumentListInfo &TemplateArgs) {
3898 assert(Template && "A variable template id without template?")((Template && "A variable template id without template?"
) ? static_cast<void> (0) : __assert_fail ("Template && \"A variable template id without template?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3898, __PRETTY_FUNCTION__))
;
3899
3900 // Check that the template argument list is well-formed for this template.
3901 SmallVector<TemplateArgument, 4> Converted;
3902 if (CheckTemplateArgumentList(
25
Taking false branch
3903 Template, TemplateNameLoc,
3904 const_cast<TemplateArgumentListInfo &>(TemplateArgs), false,
3905 Converted))
3906 return true;
3907
3908 // Find the variable template specialization declaration that
3909 // corresponds to these arguments.
3910 void *InsertPos = nullptr;
3911 if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
26
Assuming 'Spec' is null
27
Taking false branch
3912 Converted, InsertPos)) {
3913 checkSpecializationVisibility(TemplateNameLoc, Spec);
3914 // If we already have a variable template specialization, return it.
3915 return Spec;
3916 }
3917
3918 // This is the first time we have referenced this variable template
3919 // specialization. Create the canonical declaration and add it to
3920 // the set of specializations, based on the closest partial specialization
3921 // that it represents. That is,
3922 VarDecl *InstantiationPattern = Template->getTemplatedDecl();
3923 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
3924 Converted);
3925 TemplateArgumentList *InstantiationArgs = &TemplateArgList;
3926 bool AmbiguousPartialSpec = false;
3927 typedef PartialSpecMatchResult MatchResult;
3928 SmallVector<MatchResult, 4> Matched;
3929 SourceLocation PointOfInstantiation = TemplateNameLoc;
3930 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation,
3931 /*ForTakingAddress=*/false);
3932
3933 // 1. Attempt to find the closest partial specialization that this
3934 // specializes, if any.
3935 // If any of the template arguments is dependent, then this is probably
3936 // a placeholder for an incomplete declarative context; which must be
3937 // complete by instantiation time. Thus, do not search through the partial
3938 // specializations yet.
3939 // TODO: Unify with InstantiateClassTemplateSpecialization()?
3940 // Perhaps better after unification of DeduceTemplateArguments() and
3941 // getMoreSpecializedPartialSpecialization().
3942 bool InstantiationDependent = false;
3943 if (!TemplateSpecializationType::anyDependentTemplateArguments(
28
Assuming the condition is false
29
Taking false branch
3944 TemplateArgs, InstantiationDependent)) {
3945
3946 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
3947 Template->getPartialSpecializations(PartialSpecs);
3948
3949 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
3950 VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
3951 TemplateDeductionInfo Info(FailedCandidates.getLocation());
3952
3953 if (TemplateDeductionResult Result =
3954 DeduceTemplateArguments(Partial, TemplateArgList, Info)) {
3955 // Store the failed-deduction information for use in diagnostics, later.
3956 // TODO: Actually use the failed-deduction info?
3957 FailedCandidates.addCandidate().set(
3958 DeclAccessPair::make(Template, AS_public), Partial,
3959 MakeDeductionFailureInfo(Context, Result, Info));
3960 (void)Result;
3961 } else {
3962 Matched.push_back(PartialSpecMatchResult());
3963 Matched.back().Partial = Partial;
3964 Matched.back().Args = Info.take();
3965 }
3966 }
3967
3968 if (Matched.size() >= 1) {
3969 SmallVector<MatchResult, 4>::iterator Best = Matched.begin();
3970 if (Matched.size() == 1) {
3971 // -- If exactly one matching specialization is found, the
3972 // instantiation is generated from that specialization.
3973 // We don't need to do anything for this.
3974 } else {
3975 // -- If more than one matching specialization is found, the
3976 // partial order rules (14.5.4.2) are used to determine
3977 // whether one of the specializations is more specialized
3978 // than the others. If none of the specializations is more
3979 // specialized than all of the other matching
3980 // specializations, then the use of the variable template is
3981 // ambiguous and the program is ill-formed.
3982 for (SmallVector<MatchResult, 4>::iterator P = Best + 1,
3983 PEnd = Matched.end();
3984 P != PEnd; ++P) {
3985 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
3986 PointOfInstantiation) ==
3987 P->Partial)
3988 Best = P;
3989 }
3990
3991 // Determine if the best partial specialization is more specialized than
3992 // the others.
3993 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
3994 PEnd = Matched.end();
3995 P != PEnd; ++P) {
3996 if (P != Best && getMoreSpecializedPartialSpecialization(
3997 P->Partial, Best->Partial,
3998 PointOfInstantiation) != Best->Partial) {
3999 AmbiguousPartialSpec = true;
4000 break;
4001 }
4002 }
4003 }
4004
4005 // Instantiate using the best variable template partial specialization.
4006 InstantiationPattern = Best->Partial;
4007 InstantiationArgs = Best->Args;
4008 } else {
4009 // -- If no match is found, the instantiation is generated
4010 // from the primary template.
4011 // InstantiationPattern = Template->getTemplatedDecl();
4012 }
4013 }
4014
4015 // 2. Create the canonical declaration.
4016 // Note that we do not instantiate a definition until we see an odr-use
4017 // in DoMarkVarDeclReferenced().
4018 // FIXME: LateAttrs et al.?
4019 VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
4020 Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
4021 Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/);
4022 if (!Decl)
30
Assuming 'Decl' is non-null
31
Taking false branch
4023 return true;
4024
4025 if (AmbiguousPartialSpec) {
32
Taking false branch
4026 // Partial ordering did not produce a clear winner. Complain.
4027 Decl->setInvalidDecl();
4028 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
4029 << Decl;
4030
4031 // Print the matching partial specializations.
4032 for (MatchResult P : Matched)
4033 Diag(P.Partial->getLocation(), diag::note_partial_spec_match)
4034 << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(),
4035 *P.Args);
4036 return true;
4037 }
4038
4039 if (VarTemplatePartialSpecializationDecl *D =
33
Assuming 'D' is non-null
34
Taking true branch
4040 dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
4041 Decl->setInstantiationOf(D, InstantiationArgs);
35
Calling 'VarTemplateSpecializationDecl::setInstantiationOf'
4042
4043 checkSpecializationVisibility(TemplateNameLoc, Decl);
4044
4045 assert(Decl && "No variable template specialization?")((Decl && "No variable template specialization?") ? static_cast
<void> (0) : __assert_fail ("Decl && \"No variable template specialization?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4045, __PRETTY_FUNCTION__))
;
4046 return Decl;
4047}
4048
4049ExprResult
4050Sema::CheckVarTemplateId(const CXXScopeSpec &SS,
4051 const DeclarationNameInfo &NameInfo,
4052 VarTemplateDecl *Template, SourceLocation TemplateLoc,
4053 const TemplateArgumentListInfo *TemplateArgs) {
4054
4055 DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(),
4056 *TemplateArgs);
4057 if (Decl.isInvalid())
4058 return ExprError();
4059
4060 VarDecl *Var = cast<VarDecl>(Decl.get());
4061 if (!Var->getTemplateSpecializationKind())
4062 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
4063 NameInfo.getLoc());
4064
4065 // Build an ordinary singleton decl ref.
4066 return BuildDeclarationNameExpr(SS, NameInfo, Var,
4067 /*FoundD=*/nullptr, TemplateArgs);
4068}
4069
4070void Sema::diagnoseMissingTemplateArguments(TemplateName Name,
4071 SourceLocation Loc) {
4072 Diag(Loc, diag::err_template_missing_args)
4073 << (int)getTemplateNameKindForDiagnostics(Name) << Name;
4074 if (TemplateDecl *TD = Name.getAsTemplateDecl()) {
4075 Diag(TD->getLocation(), diag::note_template_decl_here)
4076 << TD->getTemplateParameters()->getSourceRange();
4077 }
4078}
4079
4080ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
4081 SourceLocation TemplateKWLoc,
4082 LookupResult &R,
4083 bool RequiresADL,
4084 const TemplateArgumentListInfo *TemplateArgs) {
4085 // FIXME: Can we do any checking at this point? I guess we could check the
4086 // template arguments that we have against the template name, if the template
4087 // name refers to a single template. That's not a terribly common case,
4088 // though.
4089 // foo<int> could identify a single function unambiguously
4090 // This approach does NOT work, since f<int>(1);
4091 // gets resolved prior to resorting to overload resolution
4092 // i.e., template<class T> void f(double);
4093 // vs template<class T, class U> void f(U);
4094
4095 // These should be filtered out by our callers.
4096 assert(!R.empty() && "empty lookup results when building templateid")((!R.empty() && "empty lookup results when building templateid"
) ? static_cast<void> (0) : __assert_fail ("!R.empty() && \"empty lookup results when building templateid\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4096, __PRETTY_FUNCTION__))
;
4097 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")((!R.isAmbiguous() && "ambiguous lookup when building templateid"
) ? static_cast<void> (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4097, __PRETTY_FUNCTION__))
;
4098
4099 // Non-function templates require a template argument list.
4100 if (auto *TD = R.getAsSingle<TemplateDecl>()) {
4101 if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) {
4102 diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc());
4103 return ExprError();
4104 }
4105 }
4106
4107 auto AnyDependentArguments = [&]() -> bool {
4108 bool InstantiationDependent;
4109 return TemplateArgs &&
4110 TemplateSpecializationType::anyDependentTemplateArguments(
4111 *TemplateArgs, InstantiationDependent);
4112 };
4113
4114 // In C++1y, check variable template ids.
4115 if (R.getAsSingle<VarTemplateDecl>() && !AnyDependentArguments()) {
4116 return CheckVarTemplateId(SS, R.getLookupNameInfo(),
4117 R.getAsSingle<VarTemplateDecl>(),
4118 TemplateKWLoc, TemplateArgs);
4119 }
4120
4121 // We don't want lookup warnings at this point.
4122 R.suppressDiagnostics();
4123
4124 UnresolvedLookupExpr *ULE
4125 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
4126 SS.getWithLocInContext(Context),
4127 TemplateKWLoc,
4128 R.getLookupNameInfo(),
4129 RequiresADL, TemplateArgs,
4130 R.begin(), R.end());
4131
4132 return ULE;
4133}
4134
4135// We actually only call this from template instantiation.
4136ExprResult
4137Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
4138 SourceLocation TemplateKWLoc,
4139 const DeclarationNameInfo &NameInfo,
4140 const TemplateArgumentListInfo *TemplateArgs) {
4141
4142 assert(TemplateArgs || TemplateKWLoc.isValid())((TemplateArgs || TemplateKWLoc.isValid()) ? static_cast<void
> (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4142, __PRETTY_FUNCTION__))
;
4143 DeclContext *DC;
4144 if (!(DC = computeDeclContext(SS, false)) ||
4145 DC->isDependentContext() ||
4146 RequireCompleteDeclContext(SS, DC))
4147 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
4148
4149 bool MemberOfUnknownSpecialization;
4150 LookupResult R(*this, NameInfo, LookupOrdinaryName);
4151 if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(),
4152 /*Entering*/false, MemberOfUnknownSpecialization,
4153 TemplateKWLoc))
4154 return ExprError();
4155
4156 if (R.isAmbiguous())
4157 return ExprError();
4158
4159 if (R.empty()) {
4160 Diag(NameInfo.getLoc(), diag::err_no_member)
4161 << NameInfo.getName() << DC << SS.getRange();
4162 return ExprError();
4163 }
4164
4165 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
4166 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
4167 << SS.getScopeRep()
4168 << NameInfo.getName().getAsString() << SS.getRange();
4169 Diag(Temp->getLocation(), diag::note_referenced_class_template);
4170 return ExprError();
4171 }
4172
4173 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
4174}
4175
4176/// Form a dependent template name.
4177///
4178/// This action forms a dependent template name given the template
4179/// name and its (presumably dependent) scope specifier. For
4180/// example, given "MetaFun::template apply", the scope specifier \p
4181/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
4182/// of the "template" keyword, and "apply" is the \p Name.
4183TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
4184 CXXScopeSpec &SS,
4185 SourceLocation TemplateKWLoc,
4186 const UnqualifiedId &Name,
4187 ParsedType ObjectType,
4188 bool EnteringContext,
4189 TemplateTy &Result,
4190 bool AllowInjectedClassName) {
4191 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
4192 Diag(TemplateKWLoc,
4193 getLangOpts().CPlusPlus11 ?
4194 diag::warn_cxx98_compat_template_outside_of_template :
4195 diag::ext_template_outside_of_template)
4196 << FixItHint::CreateRemoval(TemplateKWLoc);
4197
4198 DeclContext *LookupCtx = nullptr;
4199 if (SS.isSet())
4200 LookupCtx = computeDeclContext(SS, EnteringContext);
4201 if (!LookupCtx && ObjectType)
4202 LookupCtx = computeDeclContext(ObjectType.get());
4203 if (LookupCtx) {
4204 // C++0x [temp.names]p5:
4205 // If a name prefixed by the keyword template is not the name of
4206 // a template, the program is ill-formed. [Note: the keyword
4207 // template may not be applied to non-template members of class
4208 // templates. -end note ] [ Note: as is the case with the
4209 // typename prefix, the template prefix is allowed in cases
4210 // where it is not strictly necessary; i.e., when the
4211 // nested-name-specifier or the expression on the left of the ->
4212 // or . is not dependent on a template-parameter, or the use
4213 // does not appear in the scope of a template. -end note]
4214 //
4215 // Note: C++03 was more strict here, because it banned the use of
4216 // the "template" keyword prior to a template-name that was not a
4217 // dependent name. C++ DR468 relaxed this requirement (the
4218 // "template" keyword is now permitted). We follow the C++0x
4219 // rules, even in C++03 mode with a warning, retroactively applying the DR.
4220 bool MemberOfUnknownSpecialization;
4221 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
4222 ObjectType, EnteringContext, Result,
4223 MemberOfUnknownSpecialization);
4224 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization) {
4225 // This is a dependent template. Handle it below.
4226 } else if (TNK == TNK_Non_template) {
4227 // Do the lookup again to determine if this is a "nothing found" case or
4228 // a "not a template" case. FIXME: Refactor isTemplateName so we don't
4229 // need to do this.
4230 DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name);
4231 LookupResult R(*this, DNI.getName(), Name.getBeginLoc(),
4232 LookupOrdinaryName);
4233 bool MOUS;
4234 if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext,
4235 MOUS, TemplateKWLoc))
4236 Diag(Name.getBeginLoc(), diag::err_no_member)
4237 << DNI.getName() << LookupCtx << SS.getRange();
4238 return TNK_Non_template;
4239 } else {
4240 // We found something; return it.
4241 auto *LookupRD = dyn_cast<CXXRecordDecl>(LookupCtx);
4242 if (!AllowInjectedClassName && SS.isSet() && LookupRD &&
4243 Name.getKind() == UnqualifiedIdKind::IK_Identifier &&
4244 Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) {
4245 // C++14 [class.qual]p2:
4246 // In a lookup in which function names are not ignored and the
4247 // nested-name-specifier nominates a class C, if the name specified
4248 // [...] is the injected-class-name of C, [...] the name is instead
4249 // considered to name the constructor
4250 //
4251 // We don't get here if naming the constructor would be valid, so we
4252 // just reject immediately and recover by treating the
4253 // injected-class-name as naming the template.
4254 Diag(Name.getBeginLoc(),
4255 diag::ext_out_of_line_qualified_id_type_names_constructor)
4256 << Name.Identifier
4257 << 0 /*injected-class-name used as template name*/
4258 << 1 /*'template' keyword was used*/;
4259 }
4260 return TNK;
4261 }
4262 }
4263
4264 NestedNameSpecifier *Qualifier = SS.getScopeRep();
4265
4266 switch (Name.getKind()) {
4267 case UnqualifiedIdKind::IK_Identifier:
4268 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4269 Name.Identifier));
4270 return TNK_Dependent_template_name;
4271
4272 case UnqualifiedIdKind::IK_OperatorFunctionId:
4273 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4274 Name.OperatorFunctionId.Operator));
4275 return TNK_Function_template;
4276
4277 case UnqualifiedIdKind::IK_LiteralOperatorId:
4278 llvm_unreachable("literal operator id cannot have a dependent scope")::llvm::llvm_unreachable_internal("literal operator id cannot have a dependent scope"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4278)
;
4279
4280 default:
4281 break;
4282 }
4283
4284 Diag(Name.getBeginLoc(), diag::err_template_kw_refers_to_non_template)
4285 << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange()
4286 << TemplateKWLoc;
4287 return TNK_Non_template;
4288}
4289
4290bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
4291 TemplateArgumentLoc &AL,
4292 SmallVectorImpl<TemplateArgument> &Converted) {
4293 const TemplateArgument &Arg = AL.getArgument();
4294 QualType ArgType;
4295 TypeSourceInfo *TSI = nullptr;
4296
4297 // Check template type parameter.
4298 switch(Arg.getKind()) {
4299 case TemplateArgument::Type:
4300 // C++ [temp.arg.type]p1:
4301 // A template-argument for a template-parameter which is a
4302 // type shall be a type-id.
4303 ArgType = Arg.getAsType();
4304 TSI = AL.getTypeSourceInfo();
4305 break;
4306 case TemplateArgument::Template:
4307 case TemplateArgument::TemplateExpansion: {
4308 // We have a template type parameter but the template argument
4309 // is a template without any arguments.
4310 SourceRange SR = AL.getSourceRange();
4311 TemplateName Name = Arg.getAsTemplateOrTemplatePattern();
4312 diagnoseMissingTemplateArguments(Name, SR.getEnd());
4313 return true;
4314 }
4315 case TemplateArgument::Expression: {
4316 // We have a template type parameter but the template argument is an
4317 // expression; see if maybe it is missing the "typename" keyword.
4318 CXXScopeSpec SS;
4319 DeclarationNameInfo NameInfo;
4320
4321 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
4322 SS.Adopt(ArgExpr->getQualifierLoc());
4323 NameInfo = ArgExpr->getNameInfo();
4324 } else if (DependentScopeDeclRefExpr *ArgExpr =
4325 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
4326 SS.Adopt(ArgExpr->getQualifierLoc());
4327 NameInfo = ArgExpr->getNameInfo();
4328 } else if (CXXDependentScopeMemberExpr *ArgExpr =
4329 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
4330 if (ArgExpr->isImplicitAccess()) {
4331 SS.Adopt(ArgExpr->getQualifierLoc());
4332 NameInfo = ArgExpr->getMemberNameInfo();
4333 }
4334 }
4335
4336 if (auto *II = NameInfo.getName().getAsIdentifierInfo()) {
4337 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
4338 LookupParsedName(Result, CurScope, &SS);
4339
4340 if (Result.getAsSingle<TypeDecl>() ||
4341 Result.getResultKind() ==
4342 LookupResult::NotFoundInCurrentInstantiation) {
4343 // Suggest that the user add 'typename' before the NNS.
4344 SourceLocation Loc = AL.getSourceRange().getBegin();
4345 Diag(Loc, getLangOpts().MSVCCompat
4346 ? diag::ext_ms_template_type_arg_missing_typename
4347 : diag::err_template_arg_must_be_type_suggest)
4348 << FixItHint::CreateInsertion(Loc, "typename ");
4349 Diag(Param->getLocation(), diag::note_template_param_here);
4350
4351 // Recover by synthesizing a type using the location information that we
4352 // already have.
4353 ArgType =
4354 Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II);
4355 TypeLocBuilder TLB;
4356 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType);
4357 TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/));
4358 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4359 TL.setNameLoc(NameInfo.getLoc());
4360 TSI = TLB.getTypeSourceInfo(Context, ArgType);
4361
4362 // Overwrite our input TemplateArgumentLoc so that we can recover
4363 // properly.
4364 AL = TemplateArgumentLoc(TemplateArgument(ArgType),
4365 TemplateArgumentLocInfo(TSI));
4366
4367 break;
4368 }
4369 }
4370 // fallthrough
4371 LLVM_FALLTHROUGH[[clang::fallthrough]];
4372 }
4373 default: {
4374 // We have a template type parameter but the template argument
4375 // is not a type.
4376 SourceRange SR = AL.getSourceRange();
4377 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
4378 Diag(Param->getLocation(), diag::note_template_param_here);
4379
4380 return true;
4381 }
4382 }
4383
4384 if (CheckTemplateArgument(Param, TSI))
4385 return true;
4386
4387 // Add the converted template type argument.
4388 ArgType = Context.getCanonicalType(ArgType);
4389
4390 // Objective-C ARC:
4391 // If an explicitly-specified template argument type is a lifetime type
4392 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
4393 if (getLangOpts().ObjCAutoRefCount &&
4394 ArgType->isObjCLifetimeType() &&
4395 !ArgType.getObjCLifetime()) {
4396 Qualifiers Qs;
4397 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
4398 ArgType = Context.getQualifiedType(ArgType, Qs);
4399 }
4400
4401 Converted.push_back(TemplateArgument(ArgType));
4402 return false;
4403}
4404
4405/// Substitute template arguments into the default template argument for
4406/// the given template type parameter.
4407///
4408/// \param SemaRef the semantic analysis object for which we are performing
4409/// the substitution.
4410///
4411/// \param Template the template that we are synthesizing template arguments
4412/// for.
4413///
4414/// \param TemplateLoc the location of the template name that started the
4415/// template-id we are checking.
4416///
4417/// \param RAngleLoc the location of the right angle bracket ('>') that
4418/// terminates the template-id.
4419///
4420/// \param Param the template template parameter whose default we are
4421/// substituting into.
4422///
4423/// \param Converted the list of template arguments provided for template
4424/// parameters that precede \p Param in the template parameter list.
4425/// \returns the substituted template argument, or NULL if an error occurred.
4426static TypeSourceInfo *
4427SubstDefaultTemplateArgument(Sema &SemaRef,
4428 TemplateDecl *Template,
4429 SourceLocation TemplateLoc,
4430 SourceLocation RAngleLoc,
4431 TemplateTypeParmDecl *Param,
4432 SmallVectorImpl<TemplateArgument> &Converted) {
4433 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
4434
4435 // If the argument type is dependent, instantiate it now based
4436 // on the previously-computed template arguments.
4437 if (ArgType->getType()->isDependentType()) {
4438 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4439 Param, Template, Converted,
4440 SourceRange(TemplateLoc, RAngleLoc));
4441 if (Inst.isInvalid())
4442 return nullptr;
4443
4444 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4445
4446 // Only substitute for the innermost template argument list.
4447 MultiLevelTemplateArgumentList TemplateArgLists;
4448 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4449 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4450 TemplateArgLists.addOuterTemplateArguments(None);
4451
4452 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4453 ArgType =
4454 SemaRef.SubstType(ArgType, TemplateArgLists,
4455 Param->getDefaultArgumentLoc(), Param->getDeclName());
4456 }
4457
4458 return ArgType;
4459}
4460
4461/// Substitute template arguments into the default template argument for
4462/// the given non-type template parameter.
4463///
4464/// \param SemaRef the semantic analysis object for which we are performing
4465/// the substitution.
4466///
4467/// \param Template the template that we are synthesizing template arguments
4468/// for.
4469///
4470/// \param TemplateLoc the location of the template name that started the
4471/// template-id we are checking.
4472///
4473/// \param RAngleLoc the location of the right angle bracket ('>') that
4474/// terminates the template-id.
4475///
4476/// \param Param the non-type template parameter whose default we are
4477/// substituting into.
4478///
4479/// \param Converted the list of template arguments provided for template
4480/// parameters that precede \p Param in the template parameter list.
4481///
4482/// \returns the substituted template argument, or NULL if an error occurred.
4483static ExprResult
4484SubstDefaultTemplateArgument(Sema &SemaRef,
4485 TemplateDecl *Template,
4486 SourceLocation TemplateLoc,
4487 SourceLocation RAngleLoc,
4488 NonTypeTemplateParmDecl *Param,
4489 SmallVectorImpl<TemplateArgument> &Converted) {
4490 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4491 Param, Template, Converted,
4492 SourceRange(TemplateLoc, RAngleLoc));
4493 if (Inst.isInvalid())
4494 return ExprError();
4495
4496 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4497
4498 // Only substitute for the innermost template argument list.
4499 MultiLevelTemplateArgumentList TemplateArgLists;
4500 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4501 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4502 TemplateArgLists.addOuterTemplateArguments(None);
4503
4504 EnterExpressionEvaluationContext ConstantEvaluated(
4505 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4506 return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists);
4507}
4508
4509/// Substitute template arguments into the default template argument for
4510/// the given template template parameter.
4511///
4512/// \param SemaRef the semantic analysis object for which we are performing
4513/// the substitution.
4514///
4515/// \param Template the template that we are synthesizing template arguments
4516/// for.
4517///
4518/// \param TemplateLoc the location of the template name that started the
4519/// template-id we are checking.
4520///
4521/// \param RAngleLoc the location of the right angle bracket ('>') that
4522/// terminates the template-id.
4523///
4524/// \param Param the template template parameter whose default we are
4525/// substituting into.
4526///
4527/// \param Converted the list of template arguments provided for template
4528/// parameters that precede \p Param in the template parameter list.
4529///
4530/// \param QualifierLoc Will be set to the nested-name-specifier (with
4531/// source-location information) that precedes the template name.
4532///
4533/// \returns the substituted template argument, or NULL if an error occurred.
4534static TemplateName
4535SubstDefaultTemplateArgument(Sema &SemaRef,
4536 TemplateDecl *Template,
4537 SourceLocation TemplateLoc,
4538 SourceLocation RAngleLoc,
4539 TemplateTemplateParmDecl *Param,
4540 SmallVectorImpl<TemplateArgument> &Converted,
4541 NestedNameSpecifierLoc &QualifierLoc) {
4542 Sema::InstantiatingTemplate Inst(
4543 SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted,
4544 SourceRange(TemplateLoc, RAngleLoc));
4545 if (Inst.isInvalid())
4546 return TemplateName();
4547
4548 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4549
4550 // Only substitute for the innermost template argument list.
4551 MultiLevelTemplateArgumentList TemplateArgLists;
4552 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4553 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4554 TemplateArgLists.addOuterTemplateArguments(None);
4555
4556 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4557 // Substitute into the nested-name-specifier first,
4558 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
4559 if (QualifierLoc) {
4560 QualifierLoc =
4561 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists);
4562 if (!QualifierLoc)
4563 return TemplateName();
4564 }
4565
4566 return SemaRef.SubstTemplateName(
4567 QualifierLoc,
4568 Param->getDefaultArgument().getArgument().getAsTemplate(),
4569 Param->getDefaultArgument().getTemplateNameLoc(),
4570 TemplateArgLists);
4571}
4572
4573/// If the given template parameter has a default template
4574/// argument, substitute into that default template argument and
4575/// return the corresponding template argument.
4576TemplateArgumentLoc
4577Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
4578 SourceLocation TemplateLoc,
4579 SourceLocation RAngleLoc,
4580 Decl *Param,
4581 SmallVectorImpl<TemplateArgument>
4582 &Converted,
4583 bool &HasDefaultArg) {
4584 HasDefaultArg = false;
4585
4586 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
4587 if (!hasVisibleDefaultArgument(TypeParm))
4588 return TemplateArgumentLoc();
4589
4590 HasDefaultArg = true;
4591 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
4592 TemplateLoc,
4593 RAngleLoc,
4594 TypeParm,
4595 Converted);
4596 if (DI)
4597 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
4598
4599 return TemplateArgumentLoc();
4600 }
4601
4602 if (NonTypeTemplateParmDecl *NonTypeParm
4603 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4604 if (!hasVisibleDefaultArgument(NonTypeParm))
4605 return TemplateArgumentLoc();
4606
4607 HasDefaultArg = true;
4608 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
4609 TemplateLoc,
4610 RAngleLoc,
4611 NonTypeParm,
4612 Converted);
4613 if (Arg.isInvalid())
4614 return TemplateArgumentLoc();
4615
4616 Expr *ArgE = Arg.getAs<Expr>();
4617 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
4618 }
4619
4620 TemplateTemplateParmDecl *TempTempParm
4621 = cast<TemplateTemplateParmDecl>(Param);
4622 if (!hasVisibleDefaultArgument(TempTempParm))
4623 return TemplateArgumentLoc();
4624
4625 HasDefaultArg = true;
4626 NestedNameSpecifierLoc QualifierLoc;
4627 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
4628 TemplateLoc,
4629 RAngleLoc,
4630 TempTempParm,
4631 Converted,
4632 QualifierLoc);
4633 if (TName.isNull())
4634 return TemplateArgumentLoc();
4635
4636 return TemplateArgumentLoc(TemplateArgument(TName),
4637 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
4638 TempTempParm->getDefaultArgument().getTemplateNameLoc());
4639}
4640
4641/// Convert a template-argument that we parsed as a type into a template, if
4642/// possible. C++ permits injected-class-names to perform dual service as
4643/// template template arguments and as template type arguments.
4644static TemplateArgumentLoc convertTypeTemplateArgumentToTemplate(TypeLoc TLoc) {
4645 // Extract and step over any surrounding nested-name-specifier.
4646 NestedNameSpecifierLoc QualLoc;
4647 if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) {
4648 if (ETLoc.getTypePtr()->getKeyword() != ETK_None)
4649 return TemplateArgumentLoc();
4650
4651 QualLoc = ETLoc.getQualifierLoc();
4652 TLoc = ETLoc.getNamedTypeLoc();
4653 }
4654
4655 // If this type was written as an injected-class-name, it can be used as a
4656 // template template argument.
4657 if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>())
4658 return TemplateArgumentLoc(InjLoc.getTypePtr()->getTemplateName(),
4659 QualLoc, InjLoc.getNameLoc());
4660
4661 // If this type was written as an injected-class-name, it may have been
4662 // converted to a RecordType during instantiation. If the RecordType is
4663 // *not* wrapped in a TemplateSpecializationType and denotes a class
4664 // template specialization, it must have come from an injected-class-name.
4665 if (auto RecLoc = TLoc.getAs<RecordTypeLoc>())
4666 if (auto *CTSD =
4667 dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl()))
4668 return TemplateArgumentLoc(TemplateName(CTSD->getSpecializedTemplate()),
4669 QualLoc, RecLoc.getNameLoc());
4670
4671 return TemplateArgumentLoc();
4672}
4673
4674/// Check that the given template argument corresponds to the given
4675/// template parameter.
4676///
4677/// \param Param The template parameter against which the argument will be
4678/// checked.
4679///
4680/// \param Arg The template argument, which may be updated due to conversions.
4681///
4682/// \param Template The template in which the template argument resides.
4683///
4684/// \param TemplateLoc The location of the template name for the template
4685/// whose argument list we're matching.
4686///
4687/// \param RAngleLoc The location of the right angle bracket ('>') that closes
4688/// the template argument list.
4689///
4690/// \param ArgumentPackIndex The index into the argument pack where this
4691/// argument will be placed. Only valid if the parameter is a parameter pack.
4692///
4693/// \param Converted The checked, converted argument will be added to the
4694/// end of this small vector.
4695///
4696/// \param CTAK Describes how we arrived at this particular template argument:
4697/// explicitly written, deduced, etc.
4698///
4699/// \returns true on error, false otherwise.
4700bool Sema::CheckTemplateArgument(NamedDecl *Param,
4701 TemplateArgumentLoc &Arg,
4702 NamedDecl *Template,
4703 SourceLocation TemplateLoc,
4704 SourceLocation RAngleLoc,
4705 unsigned ArgumentPackIndex,
4706 SmallVectorImpl<TemplateArgument> &Converted,
4707 CheckTemplateArgumentKind CTAK) {
4708 // Check template type parameters.
4709 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
4710 return CheckTemplateTypeArgument(TTP, Arg, Converted);
4711
4712 // Check non-type template parameters.
4713 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4714 // Do substitution on the type of the non-type template parameter
4715 // with the template arguments we've seen thus far. But if the
4716 // template has a dependent context then we cannot substitute yet.
4717 QualType NTTPType = NTTP->getType();
4718 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
4719 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
4720
4721 // FIXME: Do we need to substitute into parameters here if they're
4722 // instantiation-dependent but not dependent?
4723 if (NTTPType->isDependentType() &&
4724 !isa<TemplateTemplateParmDecl>(Template) &&
4725 !Template->getDeclContext()->isDependentContext()) {
4726 // Do substitution on the type of the non-type template parameter.
4727 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4728 NTTP, Converted,
4729 SourceRange(TemplateLoc, RAngleLoc));
4730 if (Inst.isInvalid())
4731 return true;
4732
4733 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
4734 Converted);
4735 NTTPType = SubstType(NTTPType,
4736 MultiLevelTemplateArgumentList(TemplateArgs),
4737 NTTP->getLocation(),
4738 NTTP->getDeclName());
4739 // If that worked, check the non-type template parameter type
4740 // for validity.
4741 if (!NTTPType.isNull())
4742 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
4743 NTTP->getLocation());
4744 if (NTTPType.isNull())
4745 return true;
4746 }
4747
4748 switch (Arg.getArgument().getKind()) {
4749 case TemplateArgument::Null:
4750 llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4750)
;
4751
4752 case TemplateArgument::Expression: {
4753 TemplateArgument Result;
4754 unsigned CurSFINAEErrors = NumSFINAEErrors;
4755 ExprResult Res =
4756 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
4757 Result, CTAK);
4758 if (Res.isInvalid())
4759 return true;
4760 // If the current template argument causes an error, give up now.
4761 if (CurSFINAEErrors < NumSFINAEErrors)
4762 return true;
4763
4764 // If the resulting expression is new, then use it in place of the
4765 // old expression in the template argument.
4766 if (Res.get() != Arg.getArgument().getAsExpr()) {
4767 TemplateArgument TA(Res.get());
4768 Arg = TemplateArgumentLoc(TA, Res.get());
4769 }
4770
4771 Converted.push_back(Result);
4772 break;
4773 }
4774
4775 case TemplateArgument::Declaration:
4776 case TemplateArgument::Integral:
4777 case TemplateArgument::NullPtr:
4778 // We've already checked this template argument, so just copy
4779 // it to the list of converted arguments.
4780 Converted.push_back(Arg.getArgument());
4781 break;
4782
4783 case TemplateArgument::Template:
4784 case TemplateArgument::TemplateExpansion:
4785 // We were given a template template argument. It may not be ill-formed;
4786 // see below.
4787 if (DependentTemplateName *DTN
4788 = Arg.getArgument().getAsTemplateOrTemplatePattern()
4789 .getAsDependentTemplateName()) {
4790 // We have a template argument such as \c T::template X, which we
4791 // parsed as a template template argument. However, since we now
4792 // know that we need a non-type template argument, convert this
4793 // template name into an expression.
4794
4795 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
4796 Arg.getTemplateNameLoc());
4797
4798 CXXScopeSpec SS;
4799 SS.Adopt(Arg.getTemplateQualifierLoc());
4800 // FIXME: the template-template arg was a DependentTemplateName,
4801 // so it was provided with a template keyword. However, its source
4802 // location is not stored in the template argument structure.
4803 SourceLocation TemplateKWLoc;
4804 ExprResult E = DependentScopeDeclRefExpr::Create(
4805 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
4806 nullptr);
4807
4808 // If we parsed the template argument as a pack expansion, create a
4809 // pack expansion expression.
4810 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
4811 E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc());
4812 if (E.isInvalid())
4813 return true;
4814 }
4815
4816 TemplateArgument Result;
4817 E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result);
4818 if (E.isInvalid())
4819 return true;
4820
4821 Converted.push_back(Result);
4822 break;
4823 }
4824
4825 // We have a template argument that actually does refer to a class
4826 // template, alias template, or template template parameter, and
4827 // therefore cannot be a non-type template argument.
4828 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
4829 << Arg.getSourceRange();
4830
4831 Diag(Param->getLocation(), diag::note_template_param_here);
4832 return true;
4833
4834 case TemplateArgument::Type: {
4835 // We have a non-type template parameter but the template
4836 // argument is a type.
4837
4838 // C++ [temp.arg]p2:
4839 // In a template-argument, an ambiguity between a type-id and
4840 // an expression is resolved to a type-id, regardless of the
4841 // form of the corresponding template-parameter.
4842 //
4843 // We warn specifically about this case, since it can be rather
4844 // confusing for users.
4845 QualType T = Arg.getArgument().getAsType();
4846 SourceRange SR = Arg.getSourceRange();
4847 if (T->isFunctionType())
4848 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
4849 else
4850 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
4851 Diag(Param->getLocation(), diag::note_template_param_here);
4852 return true;
4853 }
4854
4855 case TemplateArgument::Pack:
4856 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4856)
;
4857 }
4858
4859 return false;
4860 }
4861
4862
4863 // Check template template parameters.
4864 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
4865
4866 TemplateParameterList *Params = TempParm->getTemplateParameters();
4867 if (TempParm->isExpandedParameterPack())
4868 Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex);
4869
4870 // Substitute into the template parameter list of the template
4871 // template parameter, since previously-supplied template arguments
4872 // may appear within the template template parameter.
4873 //
4874 // FIXME: Skip this if the parameters aren't instantiation-dependent.
4875 {
4876 // Set up a template instantiation context.
4877 LocalInstantiationScope Scope(*this);
4878 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4879 TempParm, Converted,
4880 SourceRange(TemplateLoc, RAngleLoc));
4881 if (Inst.isInvalid())
4882 return true;
4883
4884 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4885 Params = SubstTemplateParams(Params, CurContext,
4886 MultiLevelTemplateArgumentList(TemplateArgs));
4887 if (!Params)
4888 return true;
4889 }
4890
4891 // C++1z [temp.local]p1: (DR1004)
4892 // When [the injected-class-name] is used [...] as a template-argument for
4893 // a template template-parameter [...] it refers to the class template
4894 // itself.
4895 if (Arg.getArgument().getKind() == TemplateArgument::Type) {
4896 TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate(
4897 Arg.getTypeSourceInfo()->getTypeLoc());
4898 if (!ConvertedArg.getArgument().isNull())
4899 Arg = ConvertedArg;
4900 }
4901
4902 switch (Arg.getArgument().getKind()) {
4903 case TemplateArgument::Null:
4904 llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4904)
;
4905
4906 case TemplateArgument::Template:
4907 case TemplateArgument::TemplateExpansion:
4908 if (CheckTemplateTemplateArgument(Params, Arg))
4909 return true;
4910
4911 Converted.push_back(Arg.getArgument());
4912 break;
4913
4914 case TemplateArgument::Expression:
4915 case TemplateArgument::Type:
4916 // We have a template template parameter but the template
4917 // argument does not refer to a template.
4918 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
4919 << getLangOpts().CPlusPlus11;
4920 return true;
4921
4922 case TemplateArgument::Declaration:
4923 llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4923)
;
4924 case TemplateArgument::Integral:
4925 llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4925)
;
4926 case TemplateArgument::NullPtr:
4927 llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4927)
;
4928
4929 case TemplateArgument::Pack:
4930 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4930)
;
4931 }
4932
4933 return false;
4934}
4935
4936/// Check whether the template parameter is a pack expansion, and if so,
4937/// determine the number of parameters produced by that expansion. For instance:
4938///
4939/// \code
4940/// template<typename ...Ts> struct A {
4941/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
4942/// };
4943/// \endcode
4944///
4945/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
4946/// is not a pack expansion, so returns an empty Optional.
4947static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
4948 if (NonTypeTemplateParmDecl *NTTP
4949 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4950 if (NTTP->isExpandedParameterPack())
4951 return NTTP->getNumExpansionTypes();
4952 }
4953
4954 if (TemplateTemplateParmDecl *TTP
4955 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
4956 if (TTP->isExpandedParameterPack())
4957 return TTP->getNumExpansionTemplateParameters();
4958 }
4959
4960 return None;
4961}
4962
4963/// Diagnose a missing template argument.
4964template<typename TemplateParmDecl>
4965static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc,
4966 TemplateDecl *TD,
4967 const TemplateParmDecl *D,
4968 TemplateArgumentListInfo &Args) {
4969 // Dig out the most recent declaration of the template parameter; there may be
4970 // declarations of the template that are more recent than TD.
4971 D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl())
4972 ->getTemplateParameters()
4973 ->getParam(D->getIndex()));
4974
4975 // If there's a default argument that's not visible, diagnose that we're
4976 // missing a module import.
4977 llvm::SmallVector<Module*, 8> Modules;
4978 if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) {
4979 S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD),
4980 D->getDefaultArgumentLoc(), Modules,
4981 Sema::MissingImportKind::DefaultArgument,
4982 /*Recover*/true);
4983 return true;
4984 }
4985
4986 // FIXME: If there's a more recent default argument that *is* visible,
4987 // diagnose that it was declared too late.
4988
4989 TemplateParameterList *Params = TD->getTemplateParameters();
4990
4991 S.Diag(Loc, diag::err_template_arg_list_different_arity)
4992 << /*not enough args*/0
4993 << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD))
4994 << TD;
4995 S.Diag(TD->getLocation(), diag::note_template_decl_here)
4996 << Params->getSourceRange();
4997 return true;
4998}
4999
5000/// Check that the given template argument list is well-formed
5001/// for specializing the given template.
5002bool Sema::CheckTemplateArgumentList(
5003 TemplateDecl *Template, SourceLocation TemplateLoc,
5004 TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs,
5005 SmallVectorImpl<TemplateArgument> &Converted,
5006 bool UpdateArgsWithConversions) {
5007 // Make a copy of the template arguments for processing. Only make the
5008 // changes at the end when successful in matching the arguments to the
5009 // template.
5010 TemplateArgumentListInfo NewArgs = TemplateArgs;
5011
5012 // Make sure we get the template parameter list from the most
5013 // recentdeclaration, since that is the only one that has is guaranteed to
5014 // have all the default template argument information.
5015 TemplateParameterList *Params =
5016 cast<TemplateDecl>(Template->getMostRecentDecl())
5017 ->getTemplateParameters();
5018
5019 SourceLocation RAngleLoc = NewArgs.getRAngleLoc();
5020
5021 // C++ [temp.arg]p1:
5022 // [...] The type and form of each template-argument specified in
5023 // a template-id shall match the type and form specified for the
5024 // corresponding parameter declared by the template in its
5025 // template-parameter-list.
5026 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
5027 SmallVector<TemplateArgument, 2> ArgumentPack;
5028 unsigned ArgIdx = 0, NumArgs = NewArgs.size();
5029 LocalInstantiationScope InstScope(*this, true);
5030 for (TemplateParameterList::iterator Param = Params->begin(),
5031 ParamEnd = Params->end();
5032 Param != ParamEnd; /* increment in loop */) {
5033 // If we have an expanded parameter pack, make sure we don't have too
5034 // many arguments.
5035 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
5036 if (*Expansions == ArgumentPack.size()) {
5037 // We're done with this parameter pack. Pack up its arguments and add
5038 // them to the list.
5039 Converted.push_back(
5040 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5041 ArgumentPack.clear();
5042
5043 // This argument is assigned to the next parameter.
5044 ++Param;
5045 continue;
5046 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
5047 // Not enough arguments for this parameter pack.
5048 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5049 << /*not enough args*/0
5050 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5051 << Template;
5052 Diag(Template->getLocation(), diag::note_template_decl_here)
5053 << Params->getSourceRange();
5054 return true;
5055 }
5056 }
5057
5058 if (ArgIdx < NumArgs) {
5059 // Check the template argument we were given.
5060 if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template,
5061 TemplateLoc, RAngleLoc,
5062 ArgumentPack.size(), Converted))
5063 return true;
5064
5065 bool PackExpansionIntoNonPack =
5066 NewArgs[ArgIdx].getArgument().isPackExpansion() &&
5067 (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param));
5068 if (PackExpansionIntoNonPack && isa<TypeAliasTemplateDecl>(Template)) {
5069 // Core issue 1430: we have a pack expansion as an argument to an
5070 // alias template, and it's not part of a parameter pack. This
5071 // can't be canonicalized, so reject it now.
5072 Diag(NewArgs[ArgIdx].getLocation(),
5073 diag::err_alias_template_expansion_into_fixed_list)
5074 << NewArgs[ArgIdx].getSourceRange();
5075 Diag((*Param)->getLocation(), diag::note_template_param_here);
5076 return true;
5077 }
5078
5079 // We're now done with this argument.
5080 ++ArgIdx;
5081
5082 if ((*Param)->isTemplateParameterPack()) {
5083 // The template parameter was a template parameter pack, so take the
5084 // deduced argument and place it on the argument pack. Note that we
5085 // stay on the same template parameter so that we can deduce more
5086 // arguments.
5087 ArgumentPack.push_back(Converted.pop_back_val());
5088 } else {
5089 // Move to the next template parameter.
5090 ++Param;
5091 }
5092
5093 // If we just saw a pack expansion into a non-pack, then directly convert
5094 // the remaining arguments, because we don't know what parameters they'll
5095 // match up with.
5096 if (PackExpansionIntoNonPack) {
5097 if (!ArgumentPack.empty()) {
5098 // If we were part way through filling in an expanded parameter pack,
5099 // fall back to just producing individual arguments.
5100 Converted.insert(Converted.end(),
5101 ArgumentPack.begin(), ArgumentPack.end());
5102 ArgumentPack.clear();
5103 }
5104
5105 while (ArgIdx < NumArgs) {
5106 Converted.push_back(NewArgs[ArgIdx].getArgument());
5107 ++ArgIdx;
5108 }
5109
5110 return false;
5111 }
5112
5113 continue;
5114 }
5115
5116 // If we're checking a partial template argument list, we're done.
5117 if (PartialTemplateArgs) {
5118 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
5119 Converted.push_back(
5120 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5121
5122 return false;
5123 }
5124
5125 // If we have a template parameter pack with no more corresponding
5126 // arguments, just break out now and we'll fill in the argument pack below.
5127 if ((*Param)->isTemplateParameterPack()) {
5128 assert(!getExpandedPackSize(*Param) &&((!getExpandedPackSize(*Param) && "Should have dealt with this already"
) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5129, __PRETTY_FUNCTION__))
5129 "Should have dealt with this already")((!getExpandedPackSize(*Param) && "Should have dealt with this already"
) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5129, __PRETTY_FUNCTION__))
;
5130
5131 // A non-expanded parameter pack before the end of the parameter list
5132 // only occurs for an ill-formed template parameter list, unless we've
5133 // got a partial argument list for a function template, so just bail out.
5134 if (Param + 1 != ParamEnd)
5135 return true;
5136
5137 Converted.push_back(
5138 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5139 ArgumentPack.clear();
5140
5141 ++Param;
5142 continue;
5143 }
5144
5145 // Check whether we have a default argument.
5146 TemplateArgumentLoc Arg;
5147
5148 // Retrieve the default template argument from the template
5149 // parameter. For each kind of template parameter, we substitute the
5150 // template arguments provided thus far and any "outer" template arguments
5151 // (when the template parameter was part of a nested template) into
5152 // the default argument.
5153 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
5154 if (!hasVisibleDefaultArgument(TTP))
5155 return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP,
5156 NewArgs);
5157
5158 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
5159 Template,
5160 TemplateLoc,
5161 RAngleLoc,
5162 TTP,
5163 Converted);
5164 if (!ArgType)
5165 return true;
5166
5167 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
5168 ArgType);
5169 } else if (NonTypeTemplateParmDecl *NTTP
5170 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
5171 if (!hasVisibleDefaultArgument(NTTP))
5172 return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP,
5173 NewArgs);
5174
5175 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
5176 TemplateLoc,
5177 RAngleLoc,
5178 NTTP,
5179 Converted);
5180 if (E.isInvalid())
5181 return true;
5182
5183 Expr *Ex = E.getAs<Expr>();
5184 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
5185 } else {
5186 TemplateTemplateParmDecl *TempParm
5187 = cast<TemplateTemplateParmDecl>(*Param);
5188
5189 if (!hasVisibleDefaultArgument(TempParm))
5190 return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm,
5191 NewArgs);
5192
5193 NestedNameSpecifierLoc QualifierLoc;
5194 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
5195 TemplateLoc,
5196 RAngleLoc,
5197 TempParm,
5198 Converted,
5199 QualifierLoc);
5200 if (Name.isNull())
5201 return true;
5202
5203 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
5204 TempParm->getDefaultArgument().getTemplateNameLoc());
5205 }
5206
5207 // Introduce an instantiation record that describes where we are using
5208 // the default template argument. We're not actually instantiating a
5209 // template here, we just create this object to put a note into the
5210 // context stack.
5211 InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted,
5212 SourceRange(TemplateLoc, RAngleLoc));
5213 if (Inst.isInvalid())
5214 return true;
5215
5216 // Check the default template argument.
5217 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
5218 RAngleLoc, 0, Converted))
5219 return true;
5220
5221 // Core issue 150 (assumed resolution): if this is a template template
5222 // parameter, keep track of the default template arguments from the
5223 // template definition.
5224 if (isTemplateTemplateParameter)
5225 NewArgs.addArgument(Arg);
5226
5227 // Move to the next template parameter and argument.
5228 ++Param;
5229 ++ArgIdx;
5230 }
5231
5232 // If we're performing a partial argument substitution, allow any trailing
5233 // pack expansions; they might be empty. This can happen even if
5234 // PartialTemplateArgs is false (the list of arguments is complete but
5235 // still dependent).
5236 if (ArgIdx < NumArgs && CurrentInstantiationScope &&
5237 CurrentInstantiationScope->getPartiallySubstitutedPack()) {
5238 while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion())
5239 Converted.push_back(NewArgs[ArgIdx++].getArgument());
5240 }
5241
5242 // If we have any leftover arguments, then there were too many arguments.
5243 // Complain and fail.
5244 if (ArgIdx < NumArgs) {
5245 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5246 << /*too many args*/1
5247 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5248 << Template
5249 << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc());
5250 Diag(Template->getLocation(), diag::note_template_decl_here)
5251 << Params->getSourceRange();
5252 return true;
5253 }
5254
5255 // No problems found with the new argument list, propagate changes back
5256 // to caller.
5257 if (UpdateArgsWithConversions)
5258 TemplateArgs = std::move(NewArgs);
5259
5260 return false;
5261}
5262
5263namespace {
5264 class UnnamedLocalNoLinkageFinder
5265 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
5266 {
5267 Sema &S;
5268 SourceRange SR;
5269
5270 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
5271
5272 public:
5273 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
5274
5275 bool Visit(QualType T) {
5276 return T.isNull() ? false : inherited::Visit(T.getTypePtr());
5277 }
5278
5279#define TYPE(Class, Parent) \
5280 bool Visit##Class##Type(const Class##Type *);
5281#define ABSTRACT_TYPE(Class, Parent) \
5282 bool Visit##Class##Type(const Class##Type *) { return false; }
5283#define NON_CANONICAL_TYPE(Class, Parent) \
5284 bool Visit##Class##Type(const Class##Type *) { return false; }
5285#include "clang/AST/TypeNodes.def"
5286
5287 bool VisitTagDecl(const TagDecl *Tag);
5288 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
5289 };
5290} // end anonymous namespace
5291
5292bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
5293 return false;
5294}
5295
5296bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
5297 return Visit(T->getElementType());
5298}
5299
5300bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
5301 return Visit(T->getPointeeType());
5302}
5303
5304bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
5305 const BlockPointerType* T) {
5306 return Visit(T->getPointeeType());
5307}
5308
5309bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
5310 const LValueReferenceType* T) {
5311 return Visit(T->getPointeeType());
5312}
5313
5314bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
5315 const RValueReferenceType* T) {
5316 return Visit(T->getPointeeType());
5317}
5318
5319bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
5320 const MemberPointerType* T) {
5321 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
5322}
5323
5324bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
5325 const ConstantArrayType* T) {
5326 return Visit(T->getElementType());
5327}
5328
5329bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
5330 const IncompleteArrayType* T) {
5331 return Visit(T->getElementType());
5332}
5333
5334bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
5335 const VariableArrayType* T) {
5336 return Visit(T->getElementType());
5337}
5338
5339bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
5340 const DependentSizedArrayType* T) {
5341 return Visit(T->getElementType());
5342}
5343
5344bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
5345 const DependentSizedExtVectorType* T) {
5346 return Visit(T->getElementType());
5347}
5348
5349bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType(
5350 const DependentAddressSpaceType *T) {
5351 return Visit(T->getPointeeType());
5352}
5353
5354bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
5355 return Visit(T->getElementType());
5356}
5357
5358bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType(
5359 const DependentVectorType *T) {
5360 return Visit(T->getElementType());
5361}
5362
5363bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
5364 return Visit(T->getElementType());
5365}
5366
5367bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
5368 const FunctionProtoType* T) {
5369 for (const auto &A : T->param_types()) {
5370 if (Visit(A))
5371 return true;
5372 }
5373
5374 return Visit(T->getReturnType());
5375}
5376
5377bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
5378 const FunctionNoProtoType* T) {
5379 return Visit(T->getReturnType());
5380}
5381
5382bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
5383 const UnresolvedUsingType*) {
5384 return false;
5385}
5386
5387bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
5388 return false;
5389}
5390
5391bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
5392 return Visit(T->getUnderlyingType());
5393}
5394
5395bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
5396 return false;
5397}
5398
5399bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
5400 const UnaryTransformType*) {
5401 return false;
5402}
5403
5404bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
5405 return Visit(T->getDeducedType());
5406}
5407
5408bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType(
5409 const DeducedTemplateSpecializationType *T) {
5410 return Visit(T->getDeducedType());
5411}
5412
5413bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
5414 return VisitTagDecl(T->getDecl());
5415}
5416
5417bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
5418 return VisitTagDecl(T->getDecl());
5419}
5420
5421bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
5422 const TemplateTypeParmType*) {
5423 return false;
5424}
5425
5426bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
5427 const SubstTemplateTypeParmPackType *) {
5428 return false;
5429}
5430
5431bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
5432 const TemplateSpecializationType*) {
5433 return false;
5434}
5435
5436bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
5437 const InjectedClassNameType* T) {
5438 return VisitTagDecl(T->getDecl());
5439}
5440
5441bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
5442 const DependentNameType* T) {
5443 return VisitNestedNameSpecifier(T->getQualifier());
5444}
5445
5446bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
5447 const DependentTemplateSpecializationType* T) {
5448 return VisitNestedNameSpecifier(T->getQualifier());
5449}
5450
5451bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
5452 const PackExpansionType* T) {
5453 return Visit(T->getPattern());
5454}
5455
5456bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
5457 return false;
5458}
5459
5460bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
5461 const ObjCInterfaceType *) {
5462 return false;
5463}
5464
5465bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
5466 const ObjCObjectPointerType *) {
5467 return false;
5468}
5469
5470bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
5471 return Visit(T->getValueType());
5472}
5473
5474bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) {
5475 return false;
5476}
5477
5478bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
5479 if (Tag->getDeclContext()->isFunctionOrMethod()) {
5480 S.Diag(SR.getBegin(),
5481 S.getLangOpts().CPlusPlus11 ?
5482 diag::warn_cxx98_compat_template_arg_local_type :
5483 diag::ext_template_arg_local_type)
5484 << S.Context.getTypeDeclType(Tag) << SR;
5485 return true;
5486 }
5487
5488 if (!Tag->hasNameForLinkage()) {
5489 S.Diag(SR.getBegin(),
5490 S.getLangOpts().CPlusPlus11 ?
5491 diag::warn_cxx98_compat_template_arg_unnamed_type :
5492 diag::ext_template_arg_unnamed_type) << SR;
5493 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
5494 return true;
5495 }
5496
5497 return false;
5498}
5499
5500bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
5501 NestedNameSpecifier *NNS) {
5502 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
5503 return true;
5504
5505 switch (NNS->getKind()) {
5506 case NestedNameSpecifier::Identifier:
5507 case NestedNameSpecifier::Namespace:
5508 case NestedNameSpecifier::NamespaceAlias:
5509 case NestedNameSpecifier::Global:
5510 case NestedNameSpecifier::Super:
5511 return false;
5512
5513 case NestedNameSpecifier::TypeSpec:
5514 case NestedNameSpecifier::TypeSpecWithTemplate:
5515 return Visit(QualType(NNS->getAsType(), 0));
5516 }
5517 llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5517)
;
5518}
5519
5520/// Check a template argument against its corresponding
5521/// template type parameter.
5522///
5523/// This routine implements the semantics of C++ [temp.arg.type]. It
5524/// returns true if an error occurred, and false otherwise.
5525bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
5526 TypeSourceInfo *ArgInfo) {
5527 assert(ArgInfo && "invalid TypeSourceInfo")((ArgInfo && "invalid TypeSourceInfo") ? static_cast<
void> (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\""
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5527, __PRETTY_FUNCTION__))
;
5528 QualType Arg = ArgInfo->getType();
5529 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
5530
5531 if (Arg->isVariablyModifiedType()) {
5532 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
5533 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
5534 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
5535 }
5536
5537 // C++03 [temp.arg.type]p2:
5538 // A local type, a type with no linkage, an unnamed type or a type
5539 // compounded from any of these types shall not be used as a
5540 // template-argument for a template type-parameter.
5541 //
5542 // C++11 allows these, and even in C++03 we allow them as an extension with
5543 // a warning.
5544 if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) {
5545 UnnamedLocalNoLinkageFinder Finder(*this, SR);
5546 (void)Finder.Visit(Context.getCanonicalType(Arg));
5547 }
5548
5549 return false;
5550}
5551
5552enum NullPointerValueKind {
5553 NPV_NotNullPointer,
5554 NPV_NullPointer,
5555 NPV_Error
5556};
5557
5558/// Determine whether the given template argument is a null pointer
5559/// value of the appropriate type.
5560static NullPointerValueKind
5561isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
5562 QualType ParamType, Expr *Arg,
5563 Decl *Entity = nullptr) {
5564 if (Arg->isValueDependent() || Arg->isTypeDependent())
5565 return NPV_NotNullPointer;
5566
5567 // dllimport'd entities aren't constant but are available inside of template
5568 // arguments.
5569 if (Entity && Entity->hasAttr<DLLImportAttr>())
5570 return NPV_NotNullPointer;
5571
5572 if (!S.isCompleteType(Arg->getExprLoc(), ParamType))
5573 llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5574)
5574 "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5574)
;
5575
5576 if (!S.getLangOpts().CPlusPlus11)
5577 return NPV_NotNullPointer;
5578
5579 // Determine whether we have a constant expression.
5580 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
5581 if (ArgRV.isInvalid())
5582 return NPV_Error;
5583 Arg = ArgRV.get();
5584
5585 Expr::EvalResult EvalResult;
5586 SmallVector<PartialDiagnosticAt, 8> Notes;
5587 EvalResult.Diag = &Notes;
5588 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
5589 EvalResult.HasSideEffects) {
5590 SourceLocation DiagLoc = Arg->getExprLoc();
5591
5592 // If our only note is the usual "invalid subexpression" note, just point
5593 // the caret at its location rather than producing an essentially
5594 // redundant note.
5595 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
5596 diag::note_invalid_subexpr_in_const_expr) {
5597 DiagLoc = Notes[0].first;
5598 Notes.clear();
5599 }
5600
5601 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
5602 << Arg->getType() << Arg->getSourceRange();
5603 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
5604 S.Diag(Notes[I].first, Notes[I].second);
5605
5606 S.Diag(Param->getLocation(), diag::note_template_param_here);
5607 return NPV_Error;
5608 }
5609
5610 // C++11 [temp.arg.nontype]p1:
5611 // - an address constant expression of type std::nullptr_t
5612 if (Arg->getType()->isNullPtrType())
5613 return NPV_NullPointer;
5614
5615 // - a constant expression that evaluates to a null pointer value (4.10); or
5616 // - a constant expression that evaluates to a null member pointer value
5617 // (4.11); or
5618 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
5619 (EvalResult.Val.isMemberPointer() &&
5620 !EvalResult.Val.getMemberPointerDecl())) {
5621 // If our expression has an appropriate type, we've succeeded.
5622 bool ObjCLifetimeConversion;
5623 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
5624 S.IsQualificationConversion(Arg->getType(), ParamType, false,
5625 ObjCLifetimeConversion))
5626 return NPV_NullPointer;
5627
5628 // The types didn't match, but we know we got a null pointer; complain,
5629 // then recover as if the types were correct.
5630 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
5631 << Arg->getType() << ParamType << Arg->getSourceRange();
5632 S.Diag(Param->getLocation(), diag::note_template_param_here);
5633 return NPV_NullPointer;
5634 }
5635
5636 // If we don't have a null pointer value, but we do have a NULL pointer
5637 // constant, suggest a cast to the appropriate type.
5638 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
5639 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
5640 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
5641 << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), Code)
5642 << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getEndLoc()),
5643 ")");
5644 S.Diag(Param->getLocation(), diag::note_template_param_here);
5645 return NPV_NullPointer;
5646 }
5647
5648 // FIXME: If we ever want to support general, address-constant expressions
5649 // as non-type template arguments, we should return the ExprResult here to
5650 // be interpreted by the caller.
5651 return NPV_NotNullPointer;
5652}
5653
5654/// Checks whether the given template argument is compatible with its
5655/// template parameter.
5656static bool CheckTemplateArgumentIsCompatibleWithParameter(
5657 Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn,
5658 Expr *Arg, QualType ArgType) {
5659 bool ObjCLifetimeConversion;
5660 if (ParamType->isPointerType() &&
5661 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
5662 S.IsQualificationConversion(ArgType, ParamType, false,
5663 ObjCLifetimeConversion)) {
5664 // For pointer-to-object types, qualification conversions are
5665 // permitted.
5666 } else {
5667 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
5668 if (!ParamRef->getPointeeType()->isFunctionType()) {
5669 // C++ [temp.arg.nontype]p5b3:
5670 // For a non-type template-parameter of type reference to
5671 // object, no conversions apply. The type referred to by the
5672 // reference may be more cv-qualified than the (otherwise
5673 // identical) type of the template- argument. The
5674 // template-parameter is bound directly to the
5675 // template-argument, which shall be an lvalue.
5676
5677 // FIXME: Other qualifiers?
5678 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
5679 unsigned ArgQuals = ArgType.getCVRQualifiers();
5680
5681 if ((ParamQuals | ArgQuals) != ParamQuals) {
5682 S.Diag(Arg->getBeginLoc(),
5683 diag::err_template_arg_ref_bind_ignores_quals)
5684 << ParamType << Arg->getType() << Arg->getSourceRange();
5685 S.Diag(Param->getLocation(), diag::note_template_param_here);
5686 return true;
5687 }
5688 }
5689 }
5690
5691 // At this point, the template argument refers to an object or
5692 // function with external linkage. We now need to check whether the
5693 // argument and parameter types are compatible.
5694 if (!S.Context.hasSameUnqualifiedType(ArgType,
5695 ParamType.getNonReferenceType())) {
5696 // We can't perform this conversion or binding.
5697 if (ParamType->isReferenceType())
5698 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_no_ref_bind)
5699 << ParamType << ArgIn->getType() << Arg->getSourceRange();
5700 else
5701 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible)
5702 << ArgIn->getType() << ParamType << Arg->getSourceRange();
5703 S.Diag(Param->getLocation(), diag::note_template_param_here);
5704 return true;
5705 }
5706 }
5707
5708 return false;
5709}
5710
5711/// Checks whether the given template argument is the address
5712/// of an object or function according to C++ [temp.arg.nontype]p1.
5713static bool
5714CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
5715 NonTypeTemplateParmDecl *Param,
5716 QualType ParamType,
5717 Expr *ArgIn,
5718 TemplateArgument &Converted) {
5719 bool Invalid = false;
5720 Expr *Arg = ArgIn;
5721 QualType ArgType = Arg->getType();
5722
5723 bool AddressTaken = false;
5724 SourceLocation AddrOpLoc;
5725 if (S.getLangOpts().MicrosoftExt) {
5726 // Microsoft Visual C++ strips all casts, allows an arbitrary number of
5727 // dereference and address-of operators.
5728 Arg = Arg->IgnoreParenCasts();
5729
5730 bool ExtWarnMSTemplateArg = false;
5731 UnaryOperatorKind FirstOpKind;
5732 SourceLocation FirstOpLoc;
5733 while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5734 UnaryOperatorKind UnOpKind = UnOp->getOpcode();
5735 if (UnOpKind == UO_Deref)
5736 ExtWarnMSTemplateArg = true;
5737 if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) {
5738 Arg = UnOp->getSubExpr()->IgnoreParenCasts();
5739 if (!AddrOpLoc.isValid()) {
5740 FirstOpKind = UnOpKind;
5741 FirstOpLoc = UnOp->getOperatorLoc();
5742 }
5743 } else
5744 break;
5745 }
5746 if (FirstOpLoc.isValid()) {
5747 if (ExtWarnMSTemplateArg)
5748 S.Diag(ArgIn->getBeginLoc(), diag::ext_ms_deref_template_argument)
5749 << ArgIn->getSourceRange();
5750
5751 if (FirstOpKind == UO_AddrOf)
5752 AddressTaken = true;
5753 else if (Arg->getType()->isPointerType()) {
5754 // We cannot let pointers get dereferenced here, that is obviously not a
5755 // constant expression.
5756 assert(FirstOpKind == UO_Deref)((FirstOpKind == UO_Deref) ? static_cast<void> (0) : __assert_fail
("FirstOpKind == UO_Deref", "/build/llvm-toolchain-snapshot-8~svn345461/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5756, __PRETTY_FUNCTION__))
;
5757 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref)
5758 << Arg->getSourceRange();
5759 }
5760 }
5761 } else {
5762 // See through any implicit casts we added to fix the type.
5763 Arg = Arg->IgnoreImpCasts();
5764
5765 // C++ [temp.arg.nontype]p1:
5766 //
5767 // A template-argument for a non-type, non-template
5768 // template-parameter shall be one of: [...]
5769 //
5770 // -- the address of an object or function with external
5771 // linkage, including function templates and function
5772 // template-ids but excluding non-static class members,
5773 // expressed as & id-expression where the & is optional if
5774 // the name refers to a function or array, or if the
5775 // corresponding template-parameter is a reference; or
5776
5777 // In C++98/03 mode, give an extension warning on any extra parentheses.
5778 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
5779 bool ExtraParens = false;
5780 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
5781 if (!Invalid && !ExtraParens) {
5782 S.Diag(Arg->getBeginLoc(),
5783 S.getLangOpts().CPlusPlus11
5784 ? diag::warn_cxx98_compat_template_arg_extra_parens
5785 : diag::ext_template_arg_extra_parens)
5786 << Arg->getSourceRange();
5787 ExtraParens = true;
5788 }
5789
5790 Arg = Parens->getSubExpr();
5791 }
5792
5793 while (SubstNonTypeTemplateParmExpr *subst =
5794 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5795 Arg = subst->getReplacement()->IgnoreImpCasts();
5796
5797 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5798 if (UnOp->getOpcode() == UO_AddrOf) {
5799 Arg = UnOp->getSubExpr();
5800 AddressTaken = true;
5801 AddrOpLoc = UnOp->getOperatorLoc();
5802 }
5803 }
5804
5805 while (SubstNonTypeTemplateParmExpr *subst =
5806 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5807 Arg = subst->getReplacement()->IgnoreImpCasts();
5808 }
5809
5810 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
5811 ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr;
5812
5813 // If our parameter has pointer type, check for a null template value.
5814 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
5815 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn,
5816 Entity)) {
5817 case NPV_NullPointer:
5818 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
5819 Converted = TemplateArgument(S.Context.getCanonicalType(ParamType),
5820 /*isNullPtr=*/true);
5821 return false;
5822
5823 case NPV_Error:
5824 return true;
5825
5826 case NPV_NotNullPointer:
5827 break;
5828 }
5829 }
5830
5831 // Stop checking the precise nature of the argument if it is value dependent,
5832 // it should be checked when instantiated.
5833 if (Arg->isValueDependent()) {
5834 Converted = TemplateArgument(ArgIn);
5835 return false;
5836 }
5837
5838 if (isa<CXXUuidofExpr>(Arg)) {
5839 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType,
5840 ArgIn, Arg, ArgType))
5841 return true;
5842
5843 Converted = TemplateArgument(ArgIn);
5844 return false;
5845 }
5846
5847 if (!DRE) {
5848 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref)
5849 << Arg->getSourceRange();
5850 S.Diag(Param->getLocation(), diag::note_template_param_here);
5851 return true;
5852 }
5853
5854 // Cannot refer to non-static data members
5855 if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) {
5856 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_field)
5857 << Entity << Arg->getSourceRange();
5858 S.Diag(Param->getLocation(), diag::note_template_param_here);
5859 return true;
5860 }
5861
5862 // Cannot refer to non-static member functions
5863 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
5864 if (!Method->isStatic()) {
5865 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_method)
5866 << Method << Arg->getSourceRange();
5867 S.Diag(Param->getLocation(), diag::note_template_param_here);
5868 return true;
5869 }
5870 }
5871
5872 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
5873 VarDecl *Var = dyn_cast<VarDecl>(Entity);
5874
5875 // A non-type template argument must refer to an object or function.
5876 if (!Func && !Var) {
5877 // We found something, but we don't know specifically what it is.
5878 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_object_or_func)
5879 << Arg->getSourceRange();
5880 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
5881 return true;
5882 }
5883
5884 // Address / reference template args must have external linkage in C++98.
5885 if (Entity->getFormalLinkage() == InternalLinkage) {
5886 S.Diag(Arg->getBeginLoc(),
5887 S.getLangOpts().CPlusPlus11
5888 ? diag::warn_cxx98_compat_template_arg_object_internal
5889 : diag::ext_template_arg_object_internal)
5890 << !Func << Entity << Arg->getSourceRange();
5891 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5892 << !Func;
5893 } else if (!Entity->hasLinkage()) {
5894 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_object_no_linkage)
5895 << !Func << Entity << Arg->getSourceRange();
5896 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5897 << !Func;
5898 return true;
5899 }
5900
5901 if (Func) {
5902 // If the template parameter has pointer type, the function decays.
5903 if (ParamType->isPointerType() && !AddressTaken)
5904 ArgType = S.Context.getPointerType(Func->getType());
5905 else if (AddressTaken && ParamType->isReferenceType()) {
5906 // If we originally had an address-of operator, but the
5907 // parameter has reference type, complain and (if things look
5908 // like they will work) drop the address-of operator.
5909 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
5910 ParamType.getNonReferenceType())) {
5911 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5912 << ParamType;
5913 S.Diag(Param->getLocation(), diag::note_template_param_here);
5914 return true;
5915 }
5916
5917 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5918 << ParamType
5919 << FixItHint::CreateRemoval(AddrOpLoc);
5920 S.Diag(Param->getLocation(), diag::note_template_param_here);
5921
5922 ArgType = Func->getType();
5923 }
5924 } else {
5925 // A value of reference type is not an object.
5926 if (Var->getType()->isReferenceType()) {
5927 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_reference_var)
5928 << Var->getType() << Arg->getSourceRange();
5929 S.Diag(Param->getLocation(), diag::note_template_param_here);
5930 return true;
5931 }
5932
5933 // A template argument must have static storage duration.
5934 if (Var->getTLSKind()) {
5935 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_thread_local)
5936 << Arg->getSourceRange();
5937 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
5938 return true;
5939 }
5940
5941 // If the template parameter has pointer type, we must have taken
5942 // the address of this object.
5943 if (ParamType->isReferenceType()) {
5944 if (AddressTaken) {
5945 // If we originally had an address-of operator, but the
5946 // parameter has reference type, complain and (if things look
5947 // like they will work) drop the address-of operator.
5948 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
5949 ParamType.getNonReferenceType())) {
5950 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5951 << ParamType;
5952 S.Diag(Param->getLocation(), diag::note_template_param_here);
5953 return true;
5954 }
5955
5956 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5957 << ParamType
5958 << FixItHint::CreateRemoval(AddrOpLoc);
5959 S.Diag(Param->getLocation(), diag::note_template_param_here);
5960
5961 ArgType = Var->getType();
5962 }
5963 } else if (!AddressTaken && ParamType->isPointerType()) {
5964 if (Var->getType()->isArrayType()) {
5965 // Array-to-pointer decay.
5966 ArgType = S.Context.getArrayDecayedType(Var->getType());
5967 } else {
5968 // If the template parameter has pointer type but the address of
5969 // this object was not taken, complain and (possibly) recover by
5970 // taking the address of the entity.
5971 ArgType = S.Context.getPointerType(Var->getType());
5972 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
5973 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of)
5974 << ParamType;
5975 S.Diag(Param->getLocation(), diag::note_template_param_here);
5976 return true;
5977 }
5978
5979 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of)
5980 << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), "&");
5981
5982 S.Diag(Param->getLocation(), diag::note_template_param_here);
5983 }
5984 }
5985 }
5986
5987 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn,
5988 Arg, ArgType))
5989 return true;
5990
5991 // Create the template argument.
5992 Converted =
5993 TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), ParamType);
5994 S.MarkAnyDeclReferenced(Arg->getBeginLoc(), Entity, false);
5995 return false;
5996}
5997
5998/// Checks whether the given template argument is a pointer to
5999/// member constant according to C++ [temp.arg.nontype]p1.
6000static bool CheckTemplateArgumentPointerToMember(Sema &S,