Bug Summary

File:tools/clang/lib/Sema/SemaTemplate.cpp
Warning:line 2665, 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-eagerly-assume -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-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn326551/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn326551/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/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-7~svn326551/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-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-03-02-155150-1477-1 -x c++ /build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp

/build/llvm-toolchain-snapshot-7~svn326551/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/// \brief [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.")(static_cast <bool> (!FD && "Cannot collect constraints from function declaration yet."
) ? void (0) : __assert_fail ("!FD && \"Cannot collect constraints from function declaration yet.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 64, __extension__ __PRETTY_FUNCTION__))
;
65 return Params->getRequiresClause();
66}
67
68/// \brief 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 return nullptr;
109}
110
111void Sema::FilterAcceptableTemplateNames(LookupResult &R,
112 bool AllowFunctionTemplates) {
113 // The set of class templates we've already seen.
114 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
115 LookupResult::Filter filter = R.makeFilter();
116 while (filter.hasNext()) {
117 NamedDecl *Orig = filter.next();
118 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig,
119 AllowFunctionTemplates);
120 if (!Repl)
121 filter.erase();
122 else if (Repl != Orig) {
123
124 // C++ [temp.local]p3:
125 // A lookup that finds an injected-class-name (10.2) can result in an
126 // ambiguity in certain cases (for example, if it is found in more than
127 // one base class). If all of the injected-class-names that are found
128 // refer to specializations of the same class template, and if the name
129 // is used as a template-name, the reference refers to the class
130 // template itself and not a specialization thereof, and is not
131 // ambiguous.
132 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
133 if (!ClassTemplates.insert(ClassTmpl).second) {
134 filter.erase();
135 continue;
136 }
137
138 // FIXME: we promote access to public here as a workaround to
139 // the fact that LookupResult doesn't let us remember that we
140 // found this template through a particular injected class name,
141 // which means we end up doing nasty things to the invariants.
142 // Pretending that access is public is *much* safer.
143 filter.replace(Repl, AS_public);
144 }
145 }
146 filter.done();
147}
148
149bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
150 bool AllowFunctionTemplates) {
151 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
152 if (isAcceptableTemplateName(Context, *I, AllowFunctionTemplates))
153 return true;
154
155 return false;
156}
157
158TemplateNameKind Sema::isTemplateName(Scope *S,
159 CXXScopeSpec &SS,
160 bool hasTemplateKeyword,
161 UnqualifiedId &Name,
162 ParsedType ObjectTypePtr,
163 bool EnteringContext,
164 TemplateTy &TemplateResult,
165 bool &MemberOfUnknownSpecialization) {
166 assert(getLangOpts().CPlusPlus && "No template names in C!")(static_cast <bool> (getLangOpts().CPlusPlus &&
"No template names in C!") ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 166, __extension__ __PRETTY_FUNCTION__))
;
167
168 DeclarationName TName;
169 MemberOfUnknownSpecialization = false;
170
171 switch (Name.getKind()) {
172 case UnqualifiedIdKind::IK_Identifier:
173 TName = DeclarationName(Name.Identifier);
174 break;
175
176 case UnqualifiedIdKind::IK_OperatorFunctionId:
177 TName = Context.DeclarationNames.getCXXOperatorName(
178 Name.OperatorFunctionId.Operator);
179 break;
180
181 case UnqualifiedIdKind::IK_LiteralOperatorId:
182 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
183 break;
184
185 default:
186 return TNK_Non_template;
187 }
188
189 QualType ObjectType = ObjectTypePtr.get();
190
191 LookupResult R(*this, TName, Name.getLocStart(), LookupOrdinaryName);
192 LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
193 MemberOfUnknownSpecialization);
194 if (R.empty()) return TNK_Non_template;
195 if (R.isAmbiguous()) {
196 // Suppress diagnostics; we'll redo this lookup later.
197 R.suppressDiagnostics();
198
199 // FIXME: we might have ambiguous templates, in which case we
200 // should at least parse them properly!
201 return TNK_Non_template;
202 }
203
204 TemplateName Template;
205 TemplateNameKind TemplateKind;
206
207 unsigned ResultCount = R.end() - R.begin();
208 if (ResultCount > 1) {
209 // We assume that we'll preserve the qualifier from a function
210 // template name in other ways.
211 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
212 TemplateKind = TNK_Function_template;
213
214 // We'll do this lookup again later.
215 R.suppressDiagnostics();
216 } else {
217 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
218
219 if (SS.isSet() && !SS.isInvalid()) {
220 NestedNameSpecifier *Qualifier = SS.getScopeRep();
221 Template = Context.getQualifiedTemplateName(Qualifier,
222 hasTemplateKeyword, TD);
223 } else {
224 Template = TemplateName(TD);
225 }
226
227 if (isa<FunctionTemplateDecl>(TD)) {
228 TemplateKind = TNK_Function_template;
229
230 // We'll do this lookup again later.
231 R.suppressDiagnostics();
232 } else {
233 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 235, __extension__ __PRETTY_FUNCTION__))
234 isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 235, __extension__ __PRETTY_FUNCTION__))
235 isa<BuiltinTemplateDecl>(TD))(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 235, __extension__ __PRETTY_FUNCTION__))
;
236 TemplateKind =
237 isa<VarTemplateDecl>(TD) ? TNK_Var_template : TNK_Type_template;
238 }
239 }
240
241 TemplateResult = TemplateTy::make(Template);
242 return TemplateKind;
243}
244
245bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
246 SourceLocation NameLoc,
247 ParsedTemplateTy *Template) {
248 CXXScopeSpec SS;
249 bool MemberOfUnknownSpecialization = false;
250
251 // We could use redeclaration lookup here, but we don't need to: the
252 // syntactic form of a deduction guide is enough to identify it even
253 // if we can't look up the template name at all.
254 LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName);
255 LookupTemplateName(R, S, SS, /*ObjectType*/QualType(),
256 /*EnteringContext*/false, MemberOfUnknownSpecialization);
257
258 if (R.empty()) return false;
259 if (R.isAmbiguous()) {
260 // FIXME: Diagnose an ambiguity if we find at least one template.
261 R.suppressDiagnostics();
262 return false;
263 }
264
265 // We only treat template-names that name type templates as valid deduction
266 // guide names.
267 TemplateDecl *TD = R.getAsSingle<TemplateDecl>();
268 if (!TD || !getAsTypeTemplateDecl(TD))
269 return false;
270
271 if (Template)
272 *Template = TemplateTy::make(TemplateName(TD));
273 return true;
274}
275
276bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
277 SourceLocation IILoc,
278 Scope *S,
279 const CXXScopeSpec *SS,
280 TemplateTy &SuggestedTemplate,
281 TemplateNameKind &SuggestedKind) {
282 // We can't recover unless there's a dependent scope specifier preceding the
283 // template name.
284 // FIXME: Typo correction?
285 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
286 computeDeclContext(*SS))
287 return false;
288
289 // The code is missing a 'template' keyword prior to the dependent template
290 // name.
291 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
292 Diag(IILoc, diag::err_template_kw_missing)
293 << Qualifier << II.getName()
294 << FixItHint::CreateInsertion(IILoc, "template ");
295 SuggestedTemplate
296 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
297 SuggestedKind = TNK_Dependent_template_name;
298 return true;
299}
300
301void Sema::LookupTemplateName(LookupResult &Found,
302 Scope *S, CXXScopeSpec &SS,
303 QualType ObjectType,
304 bool EnteringContext,
305 bool &MemberOfUnknownSpecialization) {
306 // Determine where to perform name lookup
307 MemberOfUnknownSpecialization = false;
308 DeclContext *LookupCtx = nullptr;
309 bool isDependent = false;
310 if (!ObjectType.isNull()) {
311 // This nested-name-specifier occurs in a member access expression, e.g.,
312 // x->B::f, and we are looking into the type of the object.
313 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist")(static_cast <bool> (!SS.isSet() && "ObjectType and scope specifier cannot coexist"
) ? void (0) : __assert_fail ("!SS.isSet() && \"ObjectType and scope specifier cannot coexist\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 313, __extension__ __PRETTY_FUNCTION__))
;
314 LookupCtx = computeDeclContext(ObjectType);
315 isDependent = ObjectType->isDependentType();
316 assert((isDependent || !ObjectType->isIncompleteType() ||(static_cast <bool> ((isDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(isDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 318, __extension__ __PRETTY_FUNCTION__))
317 ObjectType->castAs<TagType>()->isBeingDefined()) &&(static_cast <bool> ((isDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(isDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 318, __extension__ __PRETTY_FUNCTION__))
318 "Caller should have completed object type")(static_cast <bool> ((isDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(isDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 318, __extension__ __PRETTY_FUNCTION__))
;
319
320 // Template names cannot appear inside an Objective-C class or object type.
321 if (ObjectType->isObjCObjectOrInterfaceType()) {
322 Found.clear();
323 return;
324 }
325 } else if (SS.isSet()) {
326 // This nested-name-specifier occurs after another nested-name-specifier,
327 // so long into the context associated with the prior nested-name-specifier.
328 LookupCtx = computeDeclContext(SS, EnteringContext);
329 isDependent = isDependentScopeSpecifier(SS);
330
331 // The declaration context must be complete.
332 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
333 return;
334 }
335
336 bool ObjectTypeSearchedInScope = false;
337 bool AllowFunctionTemplatesInLookup = true;
338 if (LookupCtx) {
339 // Perform "qualified" name lookup into the declaration context we
340 // computed, which is either the type of the base of a member access
341 // expression or the declaration context associated with a prior
342 // nested-name-specifier.
343 LookupQualifiedName(Found, LookupCtx);
344 if (!ObjectType.isNull() && Found.empty()) {
345 // C++ [basic.lookup.classref]p1:
346 // In a class member access expression (5.2.5), if the . or -> token is
347 // immediately followed by an identifier followed by a <, the
348 // identifier must be looked up to determine whether the < is the
349 // beginning of a template argument list (14.2) or a less-than operator.
350 // The identifier is first looked up in the class of the object
351 // expression. If the identifier is not found, it is then looked up in
352 // the context of the entire postfix-expression and shall name a class
353 // or function template.
354 if (S) LookupName(Found, S);
355 ObjectTypeSearchedInScope = true;
356 AllowFunctionTemplatesInLookup = false;
357 }
358 } else if (isDependent && (!S || ObjectType.isNull())) {
359 // We cannot look into a dependent object type or nested nme
360 // specifier.
361 MemberOfUnknownSpecialization = true;
362 return;
363 } else {
364 // Perform unqualified name lookup in the current scope.
365 LookupName(Found, S);
366
367 if (!ObjectType.isNull())
368 AllowFunctionTemplatesInLookup = false;
369 }
370
371 if (Found.empty() && !isDependent) {
372 // If we did not find any names, attempt to correct any typos.
373 DeclarationName Name = Found.getLookupName();
374 Found.clear();
375 // Simple filter callback that, for keywords, only accepts the C++ *_cast
376 auto FilterCCC = llvm::make_unique<CorrectionCandidateCallback>();
377 FilterCCC->WantTypeSpecifiers = false;
378 FilterCCC->WantExpressionKeywords = false;
379 FilterCCC->WantRemainingKeywords = false;
380 FilterCCC->WantCXXNamedCasts = true;
381 if (TypoCorrection Corrected = CorrectTypo(
382 Found.getLookupNameInfo(), Found.getLookupKind(), S, &SS,
383 std::move(FilterCCC), CTK_ErrorRecovery, LookupCtx)) {
384 Found.setLookupName(Corrected.getCorrection());
385 if (auto *ND = Corrected.getFoundDecl())
386 Found.addDecl(ND);
387 FilterAcceptableTemplateNames(Found);
388 if (!Found.empty()) {
389 if (LookupCtx) {
390 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
391 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
392 Name.getAsString() == CorrectedStr;
393 diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest)
394 << Name << LookupCtx << DroppedSpecifier
395 << SS.getRange());
396 } else {
397 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name);
398 }
399 }
400 } else {
401 Found.setLookupName(Name);
402 }
403 }
404
405 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
406 if (Found.empty()) {
407 if (isDependent)
408 MemberOfUnknownSpecialization = true;
409 return;
410 }
411
412 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
413 !getLangOpts().CPlusPlus11) {
414 // C++03 [basic.lookup.classref]p1:
415 // [...] If the lookup in the class of the object expression finds a
416 // template, the name is also looked up in the context of the entire
417 // postfix-expression and [...]
418 //
419 // Note: C++11 does not perform this second lookup.
420 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
421 LookupOrdinaryName);
422 LookupName(FoundOuter, S);
423 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
424
425 if (FoundOuter.empty()) {
426 // - if the name is not found, the name found in the class of the
427 // object expression is used, otherwise
428 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
429 FoundOuter.isAmbiguous()) {
430 // - if the name is found in the context of the entire
431 // postfix-expression and does not name a class template, the name
432 // found in the class of the object expression is used, otherwise
433 FoundOuter.clear();
434 } else if (!Found.isSuppressingDiagnostics()) {
435 // - if the name found is a class template, it must refer to the same
436 // entity as the one found in the class of the object expression,
437 // otherwise the program is ill-formed.
438 if (!Found.isSingleResult() ||
439 Found.getFoundDecl()->getCanonicalDecl()
440 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
441 Diag(Found.getNameLoc(),
442 diag::ext_nested_name_member_ref_lookup_ambiguous)
443 << Found.getLookupName()
444 << ObjectType;
445 Diag(Found.getRepresentativeDecl()->getLocation(),
446 diag::note_ambig_member_ref_object_type)
447 << ObjectType;
448 Diag(FoundOuter.getFoundDecl()->getLocation(),
449 diag::note_ambig_member_ref_scope);
450
451 // Recover by taking the template that we found in the object
452 // expression's type.
453 }
454 }
455 }
456}
457
458void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
459 SourceLocation Less,
460 SourceLocation Greater) {
461 if (TemplateName.isInvalid())
462 return;
463
464 DeclarationNameInfo NameInfo;
465 CXXScopeSpec SS;
466 LookupNameKind LookupKind;
467
468 DeclContext *LookupCtx = nullptr;
469 NamedDecl *Found = nullptr;
470
471 // Figure out what name we looked up.
472 if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) {
473 NameInfo = ME->getMemberNameInfo();
474 SS.Adopt(ME->getQualifierLoc());
475 LookupKind = LookupMemberName;
476 LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl();
477 Found = ME->getMemberDecl();
478 } else {
479 auto *DRE = cast<DeclRefExpr>(TemplateName.get());
480 NameInfo = DRE->getNameInfo();
481 SS.Adopt(DRE->getQualifierLoc());
482 LookupKind = LookupOrdinaryName;
483 Found = DRE->getFoundDecl();
484 }
485
486 // Try to correct the name by looking for templates and C++ named casts.
487 struct TemplateCandidateFilter : CorrectionCandidateCallback {
488 TemplateCandidateFilter() {
489 WantTypeSpecifiers = false;
490 WantExpressionKeywords = false;
491 WantRemainingKeywords = false;
492 WantCXXNamedCasts = true;
493 };
494 bool ValidateCandidate(const TypoCorrection &Candidate) override {
495 if (auto *ND = Candidate.getCorrectionDecl())
496 return isAcceptableTemplateName(ND->getASTContext(), ND, true);
497 return Candidate.isKeyword();
498 }
499 };
500
501 DeclarationName Name = NameInfo.getName();
502 if (TypoCorrection Corrected =
503 CorrectTypo(NameInfo, LookupKind, S, &SS,
504 llvm::make_unique<TemplateCandidateFilter>(),
505 CTK_ErrorRecovery, LookupCtx)) {
506 auto *ND = Corrected.getFoundDecl();
507 if (ND)
508 ND = isAcceptableTemplateName(Context, ND,
509 /*AllowFunctionTemplates*/ true);
510 if (ND || Corrected.isKeyword()) {
511 if (LookupCtx) {
512 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
513 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
514 Name.getAsString() == CorrectedStr;
515 diagnoseTypo(Corrected,
516 PDiag(diag::err_non_template_in_member_template_id_suggest)
517 << Name << LookupCtx << DroppedSpecifier
518 << SS.getRange(), false);
519 } else {
520 diagnoseTypo(Corrected,
521 PDiag(diag::err_non_template_in_template_id_suggest)
522 << Name, false);
523 }
524 if (Found)
525 Diag(Found->getLocation(),
526 diag::note_non_template_in_template_id_found);
527 return;
528 }
529 }
530
531 Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id)
532 << Name << SourceRange(Less, Greater);
533 if (Found)
534 Diag(Found->getLocation(), diag::note_non_template_in_template_id_found);
535}
536
537/// ActOnDependentIdExpression - Handle a dependent id-expression that
538/// was just parsed. This is only possible with an explicit scope
539/// specifier naming a dependent type.
540ExprResult
541Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
542 SourceLocation TemplateKWLoc,
543 const DeclarationNameInfo &NameInfo,
544 bool isAddressOfOperand,
545 const TemplateArgumentListInfo *TemplateArgs) {
546 DeclContext *DC = getFunctionLevelDeclContext();
547
548 // C++11 [expr.prim.general]p12:
549 // An id-expression that denotes a non-static data member or non-static
550 // member function of a class can only be used:
551 // (...)
552 // - if that id-expression denotes a non-static data member and it
553 // appears in an unevaluated operand.
554 //
555 // If this might be the case, form a DependentScopeDeclRefExpr instead of a
556 // CXXDependentScopeMemberExpr. The former can instantiate to either
557 // DeclRefExpr or MemberExpr depending on lookup results, while the latter is
558 // always a MemberExpr.
559 bool MightBeCxx11UnevalField =
560 getLangOpts().CPlusPlus11 && isUnevaluatedContext();
561
562 // Check if the nested name specifier is an enum type.
563 bool IsEnum = false;
564 if (NestedNameSpecifier *NNS = SS.getScopeRep())
565 IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType());
566
567 if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
568 isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) {
569 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
570
571 // Since the 'this' expression is synthesized, we don't need to
572 // perform the double-lookup check.
573 NamedDecl *FirstQualifierInScope = nullptr;
574
575 return CXXDependentScopeMemberExpr::Create(
576 Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true,
577 /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc,
578 FirstQualifierInScope, NameInfo, TemplateArgs);
579 }
580
581 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
582}
583
584ExprResult
585Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
586 SourceLocation TemplateKWLoc,
587 const DeclarationNameInfo &NameInfo,
588 const TemplateArgumentListInfo *TemplateArgs) {
589 return DependentScopeDeclRefExpr::Create(
590 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
591 TemplateArgs);
592}
593
594
595/// Determine whether we would be unable to instantiate this template (because
596/// it either has no definition, or is in the process of being instantiated).
597bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
598 NamedDecl *Instantiation,
599 bool InstantiatedFromMember,
600 const NamedDecl *Pattern,
601 const NamedDecl *PatternDef,
602 TemplateSpecializationKind TSK,
603 bool Complain /*= true*/) {
604 assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||(static_cast <bool> (isa<TagDecl>(Instantiation) ||
isa<FunctionDecl>(Instantiation) || isa<VarDecl>
(Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 605, __extension__ __PRETTY_FUNCTION__))
605 isa<VarDecl>(Instantiation))(static_cast <bool> (isa<TagDecl>(Instantiation) ||
isa<FunctionDecl>(Instantiation) || isa<VarDecl>
(Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 605, __extension__ __PRETTY_FUNCTION__))
;
606
607 bool IsEntityBeingDefined = false;
608 if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef))
609 IsEntityBeingDefined = TD->isBeingDefined();
610
611 if (PatternDef && !IsEntityBeingDefined) {
612 NamedDecl *SuggestedDef = nullptr;
613 if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef,
614 /*OnlyNeedComplete*/false)) {
615 // If we're allowed to diagnose this and recover, do so.
616 bool Recover = Complain && !isSFINAEContext();
617 if (Complain)
618 diagnoseMissingImport(PointOfInstantiation, SuggestedDef,
619 Sema::MissingImportKind::Definition, Recover);
620 return !Recover;
621 }
622 return false;
623 }
624
625 if (!Complain || (PatternDef && PatternDef->isInvalidDecl()))
626 return true;
627
628 llvm::Optional<unsigned> Note;
629 QualType InstantiationTy;
630 if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation))
631 InstantiationTy = Context.getTypeDeclType(TD);
632 if (PatternDef) {
633 Diag(PointOfInstantiation,
634 diag::err_template_instantiate_within_definition)
635 << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation)
636 << InstantiationTy;
637 // Not much point in noting the template declaration here, since
638 // we're lexically inside it.
639 Instantiation->setInvalidDecl();
640 } else if (InstantiatedFromMember) {
641 if (isa<FunctionDecl>(Instantiation)) {
642 Diag(PointOfInstantiation,
643 diag::err_explicit_instantiation_undefined_member)
644 << /*member function*/ 1 << Instantiation->getDeclName()
645 << Instantiation->getDeclContext();
646 Note = diag::note_explicit_instantiation_here;
647 } else {
648 assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")(static_cast <bool> (isa<TagDecl>(Instantiation) &&
"Must be a TagDecl!") ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 648, __extension__ __PRETTY_FUNCTION__))
;
649 Diag(PointOfInstantiation,
650 diag::err_implicit_instantiate_member_undefined)
651 << InstantiationTy;
652 Note = diag::note_member_declared_at;
653 }
654 } else {
655 if (isa<FunctionDecl>(Instantiation)) {
656 Diag(PointOfInstantiation,
657 diag::err_explicit_instantiation_undefined_func_template)
658 << Pattern;
659 Note = diag::note_explicit_instantiation_here;
660 } else if (isa<TagDecl>(Instantiation)) {
661 Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
662 << (TSK != TSK_ImplicitInstantiation)
663 << InstantiationTy;
664 Note = diag::note_template_decl_here;
665 } else {
666 assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")(static_cast <bool> (isa<VarDecl>(Instantiation) &&
"Must be a VarDecl!") ? void (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 666, __extension__ __PRETTY_FUNCTION__))
;
667 if (isa<VarTemplateSpecializationDecl>(Instantiation)) {
668 Diag(PointOfInstantiation,
669 diag::err_explicit_instantiation_undefined_var_template)
670 << Instantiation;
671 Instantiation->setInvalidDecl();
672 } else
673 Diag(PointOfInstantiation,
674 diag::err_explicit_instantiation_undefined_member)
675 << /*static data member*/ 2 << Instantiation->getDeclName()
676 << Instantiation->getDeclContext();
677 Note = diag::note_explicit_instantiation_here;
678 }
679 }
680 if (Note) // Diagnostics were emitted.
681 Diag(Pattern->getLocation(), Note.getValue());
682
683 // In general, Instantiation isn't marked invalid to get more than one
684 // error for multiple undefined instantiations. But the code that does
685 // explicit declaration -> explicit definition conversion can't handle
686 // invalid declarations, so mark as invalid in that case.
687 if (TSK == TSK_ExplicitInstantiationDeclaration)
688 Instantiation->setInvalidDecl();
689 return true;
690}
691
692/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
693/// that the template parameter 'PrevDecl' is being shadowed by a new
694/// declaration at location Loc. Returns true to indicate that this is
695/// an error, and false otherwise.
696void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
697 assert(PrevDecl->isTemplateParameter() && "Not a template parameter")(static_cast <bool> (PrevDecl->isTemplateParameter()
&& "Not a template parameter") ? void (0) : __assert_fail
("PrevDecl->isTemplateParameter() && \"Not a template parameter\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 697, __extension__ __PRETTY_FUNCTION__))
;
698
699 // Microsoft Visual C++ permits template parameters to be shadowed.
700 if (getLangOpts().MicrosoftExt)
701 return;
702
703 // C++ [temp.local]p4:
704 // A template-parameter shall not be redeclared within its
705 // scope (including nested scopes).
706 Diag(Loc, diag::err_template_param_shadow)
707 << cast<NamedDecl>(PrevDecl)->getDeclName();
708 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
709}
710
711/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
712/// the parameter D to reference the templated declaration and return a pointer
713/// to the template declaration. Otherwise, do nothing to D and return null.
714TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
715 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
716 D = Temp->getTemplatedDecl();
717 return Temp;
718 }
719 return nullptr;
720}
721
722ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
723 SourceLocation EllipsisLoc) const {
724 assert(Kind == Template &&(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here"
) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 725, __extension__ __PRETTY_FUNCTION__))
725 "Only template template arguments can be pack expansions here")(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here"
) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 725, __extension__ __PRETTY_FUNCTION__))
;
726 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack
() && "Template template argument pack expansion without packs"
) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 727, __extension__ __PRETTY_FUNCTION__))
727 "Template template argument pack expansion without packs")(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack
() && "Template template argument pack expansion without packs"
) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 727, __extension__ __PRETTY_FUNCTION__))
;
728 ParsedTemplateArgument Result(*this);
729 Result.EllipsisLoc = EllipsisLoc;
730 return Result;
731}
732
733static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
734 const ParsedTemplateArgument &Arg) {
735
736 switch (Arg.getKind()) {
737 case ParsedTemplateArgument::Type: {
738 TypeSourceInfo *DI;
739 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
740 if (!DI)
741 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
742 return TemplateArgumentLoc(TemplateArgument(T), DI);
743 }
744
745 case ParsedTemplateArgument::NonType: {
746 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
747 return TemplateArgumentLoc(TemplateArgument(E), E);
748 }
749
750 case ParsedTemplateArgument::Template: {
751 TemplateName Template = Arg.getAsTemplate().get();
752 TemplateArgument TArg;
753 if (Arg.getEllipsisLoc().isValid())
754 TArg = TemplateArgument(Template, Optional<unsigned int>());
755 else
756 TArg = Template;
757 return TemplateArgumentLoc(TArg,
758 Arg.getScopeSpec().getWithLocInContext(
759 SemaRef.Context),
760 Arg.getLocation(),
761 Arg.getEllipsisLoc());
762 }
763 }
764
765 llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 765)
;
766}
767
768/// \brief Translates template arguments as provided by the parser
769/// into template arguments used by semantic analysis.
770void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
771 TemplateArgumentListInfo &TemplateArgs) {
772 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
773 TemplateArgs.addArgument(translateTemplateArgument(*this,
774 TemplateArgsIn[I]));
775}
776
777static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
778 SourceLocation Loc,
779 IdentifierInfo *Name) {
780 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
781 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration);
782 if (PrevDecl && PrevDecl->isTemplateParameter())
783 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
784}
785
786/// Convert a parsed type into a parsed template argument. This is mostly
787/// trivial, except that we may have parsed a C++17 deduced class template
788/// specialization type, in which case we should form a template template
789/// argument instead of a type template argument.
790ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) {
791 TypeSourceInfo *TInfo;
792 QualType T = GetTypeFromParser(ParsedType.get(), &TInfo);
793 if (T.isNull())
794 return ParsedTemplateArgument();
795 assert(TInfo && "template argument with no location")(static_cast <bool> (TInfo && "template argument with no location"
) ? void (0) : __assert_fail ("TInfo && \"template argument with no location\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 795, __extension__ __PRETTY_FUNCTION__))
;
796
797 // If we might have formed a deduced template specialization type, convert
798 // it to a template template argument.
799 if (getLangOpts().CPlusPlus17) {
800 TypeLoc TL = TInfo->getTypeLoc();
801 SourceLocation EllipsisLoc;
802 if (auto PET = TL.getAs<PackExpansionTypeLoc>()) {
803 EllipsisLoc = PET.getEllipsisLoc();
804 TL = PET.getPatternLoc();
805 }
806
807 CXXScopeSpec SS;
808 if (auto ET = TL.getAs<ElaboratedTypeLoc>()) {
809 SS.Adopt(ET.getQualifierLoc());
810 TL = ET.getNamedTypeLoc();
811 }
812
813 if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) {
814 TemplateName Name = DTST.getTypePtr()->getTemplateName();
815 if (SS.isSet())
816 Name = Context.getQualifiedTemplateName(SS.getScopeRep(),
817 /*HasTemplateKeyword*/ false,
818 Name.getAsTemplateDecl());
819 ParsedTemplateArgument Result(SS, TemplateTy::make(Name),
820 DTST.getTemplateNameLoc());
821 if (EllipsisLoc.isValid())
822 Result = Result.getTemplatePackExpansion(EllipsisLoc);
823 return Result;
824 }
825 }
826
827 // This is a normal type template argument. Note, if the type template
828 // argument is an injected-class-name for a template, it has a dual nature
829 // and can be used as either a type or a template. We handle that in
830 // convertTypeTemplateArgumentToTemplate.
831 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
832 ParsedType.get().getAsOpaquePtr(),
833 TInfo->getTypeLoc().getLocStart());
834}
835
836/// ActOnTypeParameter - Called when a C++ template type parameter
837/// (e.g., "typename T") has been parsed. Typename specifies whether
838/// the keyword "typename" was used to declare the type parameter
839/// (otherwise, "class" was used), and KeyLoc is the location of the
840/// "class" or "typename" keyword. ParamName is the name of the
841/// parameter (NULL indicates an unnamed template parameter) and
842/// ParamNameLoc is the location of the parameter name (if any).
843/// If the type parameter has a default argument, it will be added
844/// later via ActOnTypeParameterDefault.
845NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
846 SourceLocation EllipsisLoc,
847 SourceLocation KeyLoc,
848 IdentifierInfo *ParamName,
849 SourceLocation ParamNameLoc,
850 unsigned Depth, unsigned Position,
851 SourceLocation EqualLoc,
852 ParsedType DefaultArg) {
853 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!") ?
void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 854, __extension__ __PRETTY_FUNCTION__))
854 "Template type parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!") ?
void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 854, __extension__ __PRETTY_FUNCTION__))
;
855
856 SourceLocation Loc = ParamNameLoc;
857 if (!ParamName)
858 Loc = KeyLoc;
859
860 bool IsParameterPack = EllipsisLoc.isValid();
861 TemplateTypeParmDecl *Param
862 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
863 KeyLoc, Loc, Depth, Position, ParamName,
864 Typename, IsParameterPack);
865 Param->setAccess(AS_public);
866
867 if (ParamName) {
868 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
869
870 // Add the template parameter into the current scope.
871 S->AddDecl(Param);
872 IdResolver.AddDecl(Param);
873 }
874
875 // C++0x [temp.param]p9:
876 // A default template-argument may be specified for any kind of
877 // template-parameter that is not a template parameter pack.
878 if (DefaultArg && IsParameterPack) {
879 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
880 DefaultArg = nullptr;
881 }
882
883 // Handle the default argument, if provided.
884 if (DefaultArg) {
885 TypeSourceInfo *DefaultTInfo;
886 GetTypeFromParser(DefaultArg, &DefaultTInfo);
887
888 assert(DefaultTInfo && "expected source information for type")(static_cast <bool> (DefaultTInfo && "expected source information for type"
) ? void (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 888, __extension__ __PRETTY_FUNCTION__))
;
889
890 // Check for unexpanded parameter packs.
891 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
892 UPPC_DefaultArgument))
893 return Param;
894
895 // Check the template argument itself.
896 if (CheckTemplateArgument(Param, DefaultTInfo)) {
897 Param->setInvalidDecl();
898 return Param;
899 }
900
901 Param->setDefaultArgument(DefaultTInfo);
902 }
903
904 return Param;
905}
906
907/// \brief Check that the type of a non-type template parameter is
908/// well-formed.
909///
910/// \returns the (possibly-promoted) parameter type if valid;
911/// otherwise, produces a diagnostic and returns a NULL type.
912QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
913 SourceLocation Loc) {
914 if (TSI->getType()->isUndeducedType()) {
915 // C++1z [temp.dep.expr]p3:
916 // An id-expression is type-dependent if it contains
917 // - an identifier associated by name lookup with a non-type
918 // template-parameter declared with a type that contains a
919 // placeholder type (7.1.7.4),
920 TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy);
921 }
922
923 return CheckNonTypeTemplateParameterType(TSI->getType(), Loc);
924}
925
926QualType Sema::CheckNonTypeTemplateParameterType(QualType T,
927 SourceLocation Loc) {
928 // We don't allow variably-modified types as the type of non-type template
929 // parameters.
930 if (T->isVariablyModifiedType()) {
931 Diag(Loc, diag::err_variably_modified_nontype_template_param)
932 << T;
933 return QualType();
934 }
935
936 // C++ [temp.param]p4:
937 //
938 // A non-type template-parameter shall have one of the following
939 // (optionally cv-qualified) types:
940 //
941 // -- integral or enumeration type,
942 if (T->isIntegralOrEnumerationType() ||
943 // -- pointer to object or pointer to function,
944 T->isPointerType() ||
945 // -- reference to object or reference to function,
946 T->isReferenceType() ||
947 // -- pointer to member,
948 T->isMemberPointerType() ||
949 // -- std::nullptr_t.
950 T->isNullPtrType() ||
951 // If T is a dependent type, we can't do the check now, so we
952 // assume that it is well-formed.
953 T->isDependentType() ||
954 // Allow use of auto in template parameter declarations.
955 T->isUndeducedType()) {
956 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
957 // are ignored when determining its type.
958 return T.getUnqualifiedType();
959 }
960
961 // C++ [temp.param]p8:
962 //
963 // A non-type template-parameter of type "array of T" or
964 // "function returning T" is adjusted to be of type "pointer to
965 // T" or "pointer to function returning T", respectively.
966 else if (T->isArrayType() || T->isFunctionType())
967 return Context.getDecayedType(T);
968
969 Diag(Loc, diag::err_template_nontype_parm_bad_type)
970 << T;
971
972 return QualType();
973}
974
975NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
976 unsigned Depth,
977 unsigned Position,
978 SourceLocation EqualLoc,
979 Expr *Default) {
980 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
981
982 // Check that we have valid decl-specifiers specified.
983 auto CheckValidDeclSpecifiers = [this, &D] {
984 // C++ [temp.param]
985 // p1
986 // template-parameter:
987 // ...
988 // parameter-declaration
989 // p2
990 // ... A storage class shall not be specified in a template-parameter
991 // declaration.
992 // [dcl.typedef]p1:
993 // The typedef specifier [...] shall not be used in the decl-specifier-seq
994 // of a parameter-declaration
995 const DeclSpec &DS = D.getDeclSpec();
996 auto EmitDiag = [this](SourceLocation Loc) {
997 Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm)
998 << FixItHint::CreateRemoval(Loc);
999 };
1000 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified)
1001 EmitDiag(DS.getStorageClassSpecLoc());
1002
1003 if (DS.getThreadStorageClassSpec() != TSCS_unspecified)
1004 EmitDiag(DS.getThreadStorageClassSpecLoc());
1005
1006 // [dcl.inline]p1:
1007 // The inline specifier can be applied only to the declaration or
1008 // definition of a variable or function.
1009
1010 if (DS.isInlineSpecified())
1011 EmitDiag(DS.getInlineSpecLoc());
1012
1013 // [dcl.constexpr]p1:
1014 // The constexpr specifier shall be applied only to the definition of a
1015 // variable or variable template or the declaration of a function or
1016 // function template.
1017
1018 if (DS.isConstexprSpecified())
1019 EmitDiag(DS.getConstexprSpecLoc());
1020
1021 // [dcl.fct.spec]p1:
1022 // Function-specifiers can be used only in function declarations.
1023
1024 if (DS.isVirtualSpecified())
1025 EmitDiag(DS.getVirtualSpecLoc());
1026
1027 if (DS.isExplicitSpecified())
1028 EmitDiag(DS.getExplicitSpecLoc());
1029
1030 if (DS.isNoreturnSpecified())
1031 EmitDiag(DS.getNoreturnSpecLoc());
1032 };
1033
1034 CheckValidDeclSpecifiers();
1035
1036 if (TInfo->getType()->isUndeducedType()) {
1037 Diag(D.getIdentifierLoc(),
1038 diag::warn_cxx14_compat_template_nontype_parm_auto_type)
1039 << QualType(TInfo->getType()->getContainedAutoType(), 0);
1040 }
1041
1042 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Non-type template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1043, __extension__ __PRETTY_FUNCTION__))
1043 "Non-type template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Non-type template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1043, __extension__ __PRETTY_FUNCTION__))
;
1044 bool Invalid = false;
1045
1046 QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc());
1047 if (T.isNull()) {
1048 T = Context.IntTy; // Recover with an 'int' type.
1049 Invalid = true;
1050 }
1051
1052 IdentifierInfo *ParamName = D.getIdentifier();
1053 bool IsParameterPack = D.hasEllipsis();
1054 NonTypeTemplateParmDecl *Param
1055 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1056 D.getLocStart(),
1057 D.getIdentifierLoc(),
1058 Depth, Position, ParamName, T,
1059 IsParameterPack, TInfo);
1060 Param->setAccess(AS_public);
1061
1062 if (Invalid)
1063 Param->setInvalidDecl();
1064
1065 if (ParamName) {
1066 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
1067 ParamName);
1068
1069 // Add the template parameter into the current scope.
1070 S->AddDecl(Param);
1071 IdResolver.AddDecl(Param);
1072 }
1073
1074 // C++0x [temp.param]p9:
1075 // A default template-argument may be specified for any kind of
1076 // template-parameter that is not a template parameter pack.
1077 if (Default && IsParameterPack) {
1078 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1079 Default = nullptr;
1080 }
1081
1082 // Check the well-formedness of the default template argument, if provided.
1083 if (Default) {
1084 // Check for unexpanded parameter packs.
1085 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
1086 return Param;
1087
1088 TemplateArgument Converted;
1089 ExprResult DefaultRes =
1090 CheckTemplateArgument(Param, Param->getType(), Default, Converted);
1091 if (DefaultRes.isInvalid()) {
1092 Param->setInvalidDecl();
1093 return Param;
1094 }
1095 Default = DefaultRes.get();
1096
1097 Param->setDefaultArgument(Default);
1098 }
1099
1100 return Param;
1101}
1102
1103/// ActOnTemplateTemplateParameter - Called when a C++ template template
1104/// parameter (e.g. T in template <template \<typename> class T> class array)
1105/// has been parsed. S is the current scope.
1106NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S,
1107 SourceLocation TmpLoc,
1108 TemplateParameterList *Params,
1109 SourceLocation EllipsisLoc,
1110 IdentifierInfo *Name,
1111 SourceLocation NameLoc,
1112 unsigned Depth,
1113 unsigned Position,
1114 SourceLocation EqualLoc,
1115 ParsedTemplateArgument Default) {
1116 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Template template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1117, __extension__ __PRETTY_FUNCTION__))
1117 "Template template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Template template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1117, __extension__ __PRETTY_FUNCTION__))
;
1118
1119 // Construct the parameter object.
1120 bool IsParameterPack = EllipsisLoc.isValid();
1121 TemplateTemplateParmDecl *Param =
1122 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1123 NameLoc.isInvalid()? TmpLoc : NameLoc,
1124 Depth, Position, IsParameterPack,
1125 Name, Params);
1126 Param->setAccess(AS_public);
1127
1128 // If the template template parameter has a name, then link the identifier
1129 // into the scope and lookup mechanisms.
1130 if (Name) {
1131 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
1132
1133 S->AddDecl(Param);
1134 IdResolver.AddDecl(Param);
1135 }
1136
1137 if (Params->size() == 0) {
1138 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
1139 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
1140 Param->setInvalidDecl();
1141 }
1142
1143 // C++0x [temp.param]p9:
1144 // A default template-argument may be specified for any kind of
1145 // template-parameter that is not a template parameter pack.
1146 if (IsParameterPack && !Default.isInvalid()) {
1147 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1148 Default = ParsedTemplateArgument();
1149 }
1150
1151 if (!Default.isInvalid()) {
1152 // Check only that we have a template template argument. We don't want to
1153 // try to check well-formedness now, because our template template parameter
1154 // might have dependent types in its template parameters, which we wouldn't
1155 // be able to match now.
1156 //
1157 // If none of the template template parameter's template arguments mention
1158 // other template parameters, we could actually perform more checking here.
1159 // However, it isn't worth doing.
1160 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
1161 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
1162 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template)
1163 << DefaultArg.getSourceRange();
1164 return Param;
1165 }
1166
1167 // Check for unexpanded parameter packs.
1168 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
1169 DefaultArg.getArgument().getAsTemplate(),
1170 UPPC_DefaultArgument))
1171 return Param;
1172
1173 Param->setDefaultArgument(Context, DefaultArg);
1174 }
1175
1176 return Param;
1177}
1178
1179/// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally
1180/// constrained by RequiresClause, that contains the template parameters in
1181/// Params.
1182TemplateParameterList *
1183Sema::ActOnTemplateParameterList(unsigned Depth,
1184 SourceLocation ExportLoc,
1185 SourceLocation TemplateLoc,
1186 SourceLocation LAngleLoc,
1187 ArrayRef<NamedDecl *> Params,
1188 SourceLocation RAngleLoc,
1189 Expr *RequiresClause) {
1190 if (ExportLoc.isValid())
1191 Diag(ExportLoc, diag::warn_template_export_unsupported);
1192
1193 return TemplateParameterList::Create(
1194 Context, TemplateLoc, LAngleLoc,
1195 llvm::makeArrayRef(Params.data(), Params.size()),
1196 RAngleLoc, RequiresClause);
1197}
1198
1199static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
1200 if (SS.isSet())
1201 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
1202}
1203
1204DeclResult
1205Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
1206 SourceLocation KWLoc, CXXScopeSpec &SS,
1207 IdentifierInfo *Name, SourceLocation NameLoc,
1208 AttributeList *Attr,
1209 TemplateParameterList *TemplateParams,
1210 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
1211 SourceLocation FriendLoc,
1212 unsigned NumOuterTemplateParamLists,
1213 TemplateParameterList** OuterTemplateParamLists,
1214 SkipBodyInfo *SkipBody) {
1215 assert(TemplateParams && TemplateParams->size() > 0 &&(static_cast <bool> (TemplateParams && TemplateParams
->size() > 0 && "No template parameters") ? void
(0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1216, __extension__ __PRETTY_FUNCTION__))
1216 "No template parameters")(static_cast <bool> (TemplateParams && TemplateParams
->size() > 0 && "No template parameters") ? void
(0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1216, __extension__ __PRETTY_FUNCTION__))
;
1217 assert(TUK != TUK_Reference && "Can only declare or define class templates")(static_cast <bool> (TUK != TUK_Reference && "Can only declare or define class templates"
) ? void (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1217, __extension__ __PRETTY_FUNCTION__))
;
1218 bool Invalid = false;
1219
1220 // Check that we can declare a template here.
1221 if (CheckTemplateDeclScope(S, TemplateParams))
1222 return true;
1223
1224 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
1225 assert(Kind != TTK_Enum && "can't build template of enumerated type")(static_cast <bool> (Kind != TTK_Enum && "can't build template of enumerated type"
) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1225, __extension__ __PRETTY_FUNCTION__))
;
1226
1227 // There is no such thing as an unnamed class template.
1228 if (!Name) {
1229 Diag(KWLoc, diag::err_template_unnamed_class);
1230 return true;
1231 }
1232
1233 // Find any previous declaration with this name. For a friend with no
1234 // scope explicitly specified, we only look for tag declarations (per
1235 // C++11 [basic.lookup.elab]p2).
1236 DeclContext *SemanticContext;
1237 LookupResult Previous(*this, Name, NameLoc,
1238 (SS.isEmpty() && TUK == TUK_Friend)
1239 ? LookupTagName : LookupOrdinaryName,
1240 forRedeclarationInCurContext());
1241 if (SS.isNotEmpty() && !SS.isInvalid()) {
1242 SemanticContext = computeDeclContext(SS, true);
1243 if (!SemanticContext) {
1244 // FIXME: Horrible, horrible hack! We can't currently represent this
1245 // in the AST, and historically we have just ignored such friend
1246 // class templates, so don't complain here.
1247 Diag(NameLoc, TUK == TUK_Friend
1248 ? diag::warn_template_qualified_friend_ignored
1249 : diag::err_template_qualified_declarator_no_match)
1250 << SS.getScopeRep() << SS.getRange();
1251 return TUK != TUK_Friend;
1252 }
1253
1254 if (RequireCompleteDeclContext(SS, SemanticContext))
1255 return true;
1256
1257 // If we're adding a template to a dependent context, we may need to
1258 // rebuilding some of the types used within the template parameter list,
1259 // now that we know what the current instantiation is.
1260 if (SemanticContext->isDependentContext()) {
1261 ContextRAII SavedContext(*this, SemanticContext);
1262 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
1263 Invalid = true;
1264 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
1265 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc);
1266
1267 LookupQualifiedName(Previous, SemanticContext);
1268 } else {
1269 SemanticContext = CurContext;
1270
1271 // C++14 [class.mem]p14:
1272 // If T is the name of a class, then each of the following shall have a
1273 // name different from T:
1274 // -- every member template of class T
1275 if (TUK != TUK_Friend &&
1276 DiagnoseClassNameShadow(SemanticContext,
1277 DeclarationNameInfo(Name, NameLoc)))
1278 return true;
1279
1280 LookupName(Previous, S);
1281 }
1282
1283 if (Previous.isAmbiguous())
1284 return true;
1285
1286 NamedDecl *PrevDecl = nullptr;
1287 if (Previous.begin() != Previous.end())
1288 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1289
1290 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1291 // Maybe we will complain about the shadowed template parameter.
1292 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1293 // Just pretend that we didn't see the previous declaration.
1294 PrevDecl = nullptr;
1295 }
1296
1297 // If there is a previous declaration with the same name, check
1298 // whether this is a valid redeclaration.
1299 ClassTemplateDecl *PrevClassTemplate =
1300 dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
1301
1302 // We may have found the injected-class-name of a class template,
1303 // class template partial specialization, or class template specialization.
1304 // In these cases, grab the template that is being defined or specialized.
1305 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
1306 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
1307 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
1308 PrevClassTemplate
1309 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
1310 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
1311 PrevClassTemplate
1312 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
1313 ->getSpecializedTemplate();
1314 }
1315 }
1316
1317 if (TUK == TUK_Friend) {
1318 // C++ [namespace.memdef]p3:
1319 // [...] When looking for a prior declaration of a class or a function
1320 // declared as a friend, and when the name of the friend class or
1321 // function is neither a qualified name nor a template-id, scopes outside
1322 // the innermost enclosing namespace scope are not considered.
1323 if (!SS.isSet()) {
1324 DeclContext *OutermostContext = CurContext;
1325 while (!OutermostContext->isFileContext())
1326 OutermostContext = OutermostContext->getLookupParent();
1327
1328 if (PrevDecl &&
1329 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
1330 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
1331 SemanticContext = PrevDecl->getDeclContext();
1332 } else {
1333 // Declarations in outer scopes don't matter. However, the outermost
1334 // context we computed is the semantic context for our new
1335 // declaration.
1336 PrevDecl = PrevClassTemplate = nullptr;
1337 SemanticContext = OutermostContext;
1338
1339 // Check that the chosen semantic context doesn't already contain a
1340 // declaration of this name as a non-tag type.
1341 Previous.clear(LookupOrdinaryName);
1342 DeclContext *LookupContext = SemanticContext;
1343 while (LookupContext->isTransparentContext())
1344 LookupContext = LookupContext->getLookupParent();
1345 LookupQualifiedName(Previous, LookupContext);
1346
1347 if (Previous.isAmbiguous())
1348 return true;
1349
1350 if (Previous.begin() != Previous.end())
1351 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1352 }
1353 }
1354 } else if (PrevDecl &&
1355 !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext,
1356 S, SS.isValid()))
1357 PrevDecl = PrevClassTemplate = nullptr;
1358
1359 if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>(
1360 PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) {
1361 if (SS.isEmpty() &&
1362 !(PrevClassTemplate &&
1363 PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals(
1364 SemanticContext->getRedeclContext()))) {
1365 Diag(KWLoc, diag::err_using_decl_conflict_reverse);
1366 Diag(Shadow->getTargetDecl()->getLocation(),
1367 diag::note_using_decl_target);
1368 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
1369 // Recover by ignoring the old declaration.
1370 PrevDecl = PrevClassTemplate = nullptr;
1371 }
1372 }
1373
1374 // TODO Memory management; associated constraints are not always stored.
1375 Expr *const CurAC = formAssociatedConstraints(TemplateParams, nullptr);
1376
1377 if (PrevClassTemplate) {
1378 // Ensure that the template parameter lists are compatible. Skip this check
1379 // for a friend in a dependent context: the template parameter list itself
1380 // could be dependent.
1381 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1382 !TemplateParameterListsAreEqual(TemplateParams,
1383 PrevClassTemplate->getTemplateParameters(),
1384 /*Complain=*/true,
1385 TPL_TemplateMatch))
1386 return true;
1387
1388 // Check for matching associated constraints on redeclarations.
1389 const Expr *const PrevAC = PrevClassTemplate->getAssociatedConstraints();
1390 const bool RedeclACMismatch = [&] {
1391 if (!(CurAC || PrevAC))
1392 return false; // Nothing to check; no mismatch.
1393 if (CurAC && PrevAC) {
1394 llvm::FoldingSetNodeID CurACInfo, PrevACInfo;
1395 CurAC->Profile(CurACInfo, Context, /*Canonical=*/true);
1396 PrevAC->Profile(PrevACInfo, Context, /*Canonical=*/true);
1397 if (CurACInfo == PrevACInfo)
1398 return false; // All good; no mismatch.
1399 }
1400 return true;
1401 }();
1402
1403 if (RedeclACMismatch) {
1404 Diag(CurAC ? CurAC->getLocStart() : NameLoc,
1405 diag::err_template_different_associated_constraints);
1406 Diag(PrevAC ? PrevAC->getLocStart() : PrevClassTemplate->getLocation(),
1407 diag::note_template_prev_declaration) << /*declaration*/0;
1408 return true;
1409 }
1410
1411 // C++ [temp.class]p4:
1412 // In a redeclaration, partial specialization, explicit
1413 // specialization or explicit instantiation of a class template,
1414 // the class-key shall agree in kind with the original class
1415 // template declaration (7.1.5.3).
1416 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
1417 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
1418 TUK == TUK_Definition, KWLoc, Name)) {
1419 Diag(KWLoc, diag::err_use_with_wrong_tag)
1420 << Name
1421 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
1422 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
1423 Kind = PrevRecordDecl->getTagKind();
1424 }
1425
1426 // Check for redefinition of this class template.
1427 if (TUK == TUK_Definition) {
1428 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
1429 // If we have a prior definition that is not visible, treat this as
1430 // simply making that previous definition visible.
1431 NamedDecl *Hidden = nullptr;
1432 if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) {
1433 SkipBody->ShouldSkip = true;
1434 auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate();
1435 assert(Tmpl && "original definition of a class template is not a "(static_cast <bool> (Tmpl && "original definition of a class template is not a "
"class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1436, __extension__ __PRETTY_FUNCTION__))
1436 "class template?")(static_cast <bool> (Tmpl && "original definition of a class template is not a "
"class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1436, __extension__ __PRETTY_FUNCTION__))
;
1437 makeMergedDefinitionVisible(Hidden);
1438 makeMergedDefinitionVisible(Tmpl);
1439 return Def;
1440 }
1441
1442 Diag(NameLoc, diag::err_redefinition) << Name;
1443 Diag(Def->getLocation(), diag::note_previous_definition);
1444 // FIXME: Would it make sense to try to "forget" the previous
1445 // definition, as part of error recovery?
1446 return true;
1447 }
1448 }
1449 } else if (PrevDecl) {
1450 // C++ [temp]p5:
1451 // A class template shall not have the same name as any other
1452 // template, class, function, object, enumeration, enumerator,
1453 // namespace, or type in the same scope (3.3), except as specified
1454 // in (14.5.4).
1455 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1456 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1457 return true;
1458 }
1459
1460 // Check the template parameter list of this declaration, possibly
1461 // merging in the template parameter list from the previous class
1462 // template declaration. Skip this check for a friend in a dependent
1463 // context, because the template parameter list might be dependent.
1464 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1465 CheckTemplateParameterList(
1466 TemplateParams,
1467 PrevClassTemplate ? PrevClassTemplate->getTemplateParameters()
1468 : nullptr,
1469 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1470 SemanticContext->isDependentContext())
1471 ? TPC_ClassTemplateMember
1472 : TUK == TUK_Friend ? TPC_FriendClassTemplate
1473 : TPC_ClassTemplate))
1474 Invalid = true;
1475
1476 if (SS.isSet()) {
1477 // If the name of the template was qualified, we must be defining the
1478 // template out-of-line.
1479 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1480 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1481 : diag::err_member_decl_does_not_match)
1482 << Name << SemanticContext << /*IsDefinition*/true << SS.getRange();
1483 Invalid = true;
1484 }
1485 }
1486
1487 // If this is a templated friend in a dependent context we should not put it
1488 // on the redecl chain. In some cases, the templated friend can be the most
1489 // recent declaration tricking the template instantiator to make substitutions
1490 // there.
1491 // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious
1492 bool ShouldAddRedecl
1493 = !(TUK == TUK_Friend && CurContext->isDependentContext());
1494
1495 CXXRecordDecl *NewClass =
1496 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
1497 PrevClassTemplate && ShouldAddRedecl ?
1498 PrevClassTemplate->getTemplatedDecl() : nullptr,
1499 /*DelayTypeCreation=*/true);
1500 SetNestedNameSpecifier(NewClass, SS);
1501 if (NumOuterTemplateParamLists > 0)
1502 NewClass->setTemplateParameterListsInfo(
1503 Context, llvm::makeArrayRef(OuterTemplateParamLists,
1504 NumOuterTemplateParamLists));
1505
1506 // Add alignment attributes if necessary; these attributes are checked when
1507 // the ASTContext lays out the structure.
1508 if (TUK == TUK_Definition) {
1509 AddAlignmentAttributesForRecord(NewClass);
1510 AddMsStructLayoutForRecord(NewClass);
1511 }
1512
1513 // Attach the associated constraints when the declaration will not be part of
1514 // a decl chain.
1515 Expr *const ACtoAttach =
1516 PrevClassTemplate && ShouldAddRedecl ? nullptr : CurAC;
1517
1518 ClassTemplateDecl *NewTemplate
1519 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1520 DeclarationName(Name), TemplateParams,
1521 NewClass, ACtoAttach);
1522
1523 if (ShouldAddRedecl)
1524 NewTemplate->setPreviousDecl(PrevClassTemplate);
1525
1526 NewClass->setDescribedClassTemplate(NewTemplate);
1527
1528 if (ModulePrivateLoc.isValid())
1529 NewTemplate->setModulePrivate();
1530
1531 // Build the type for the class template declaration now.
1532 QualType T = NewTemplate->getInjectedClassNameSpecialization();
1533 T = Context.getInjectedClassNameType(NewClass, T);
1534 assert(T->isDependentType() && "Class template type is not dependent?")(static_cast <bool> (T->isDependentType() &&
"Class template type is not dependent?") ? void (0) : __assert_fail
("T->isDependentType() && \"Class template type is not dependent?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1534, __extension__ __PRETTY_FUNCTION__))
;
1535 (void)T;
1536
1537 // If we are providing an explicit specialization of a member that is a
1538 // class template, make a note of that.
1539 if (PrevClassTemplate &&
1540 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1541 PrevClassTemplate->setMemberSpecialization();
1542
1543 // Set the access specifier.
1544 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
1545 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
1546
1547 // Set the lexical context of these templates
1548 NewClass->setLexicalDeclContext(CurContext);
1549 NewTemplate->setLexicalDeclContext(CurContext);
1550
1551 if (TUK == TUK_Definition)
1552 NewClass->startDefinition();
1553
1554 if (Attr)
1555 ProcessDeclAttributeList(S, NewClass, Attr);
1556
1557 if (PrevClassTemplate)
1558 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1559
1560 AddPushedVisibilityAttribute(NewClass);
1561
1562 if (TUK != TUK_Friend) {
1563 // Per C++ [basic.scope.temp]p2, skip the template parameter scopes.
1564 Scope *Outer = S;
1565 while ((Outer->getFlags() & Scope::TemplateParamScope) != 0)
1566 Outer = Outer->getParent();
1567 PushOnScopeChains(NewTemplate, Outer);
1568 } else {
1569 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
1570 NewTemplate->setAccess(PrevClassTemplate->getAccess());
1571 NewClass->setAccess(PrevClassTemplate->getAccess());
1572 }
1573
1574 NewTemplate->setObjectOfFriendDecl();
1575
1576 // Friend templates are visible in fairly strange ways.
1577 if (!CurContext->isDependentContext()) {
1578 DeclContext *DC = SemanticContext->getRedeclContext();
1579 DC->makeDeclVisibleInContext(NewTemplate);
1580 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1581 PushOnScopeChains(NewTemplate, EnclosingScope,
1582 /* AddToContext = */ false);
1583 }
1584
1585 FriendDecl *Friend = FriendDecl::Create(
1586 Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc);
1587 Friend->setAccess(AS_public);
1588 CurContext->addDecl(Friend);
1589 }
1590
1591 if (PrevClassTemplate)
1592 CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate);
1593
1594 if (Invalid) {
1595 NewTemplate->setInvalidDecl();
1596 NewClass->setInvalidDecl();
1597 }
1598
1599 ActOnDocumentableDecl(NewTemplate);
1600
1601 return NewTemplate;
1602}
1603
1604namespace {
1605/// Transform to convert portions of a constructor declaration into the
1606/// corresponding deduction guide, per C++1z [over.match.class.deduct]p1.
1607struct ConvertConstructorToDeductionGuideTransform {
1608 ConvertConstructorToDeductionGuideTransform(Sema &S,
1609 ClassTemplateDecl *Template)
1610 : SemaRef(S), Template(Template) {}
1611
1612 Sema &SemaRef;
1613 ClassTemplateDecl *Template;
1614
1615 DeclContext *DC = Template->getDeclContext();
1616 CXXRecordDecl *Primary = Template->getTemplatedDecl();
1617 DeclarationName DeductionGuideName =
1618 SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template);
1619
1620 QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary);
1621
1622 // Index adjustment to apply to convert depth-1 template parameters into
1623 // depth-0 template parameters.
1624 unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size();
1625
1626 /// Transform a constructor declaration into a deduction guide.
1627 NamedDecl *transformConstructor(FunctionTemplateDecl *FTD,
1628 CXXConstructorDecl *CD) {
1629 SmallVector<TemplateArgument, 16> SubstArgs;
1630
1631 LocalInstantiationScope Scope(SemaRef);
1632
1633 // C++ [over.match.class.deduct]p1:
1634 // -- For each constructor of the class template designated by the
1635 // template-name, a function template with the following properties:
1636
1637 // -- The template parameters are the template parameters of the class
1638 // template followed by the template parameters (including default
1639 // template arguments) of the constructor, if any.
1640 TemplateParameterList *TemplateParams = Template->getTemplateParameters();
1641 if (FTD) {
1642 TemplateParameterList *InnerParams = FTD->getTemplateParameters();
1643 SmallVector<NamedDecl *, 16> AllParams;
1644 AllParams.reserve(TemplateParams->size() + InnerParams->size());
1645 AllParams.insert(AllParams.begin(),
1646 TemplateParams->begin(), TemplateParams->end());
1647 SubstArgs.reserve(InnerParams->size());
1648
1649 // Later template parameters could refer to earlier ones, so build up
1650 // a list of substituted template arguments as we go.
1651 for (NamedDecl *Param : *InnerParams) {
1652 MultiLevelTemplateArgumentList Args;
1653 Args.addOuterTemplateArguments(SubstArgs);
1654 Args.addOuterRetainedLevel();
1655 NamedDecl *NewParam = transformTemplateParameter(Param, Args);
1656 if (!NewParam)
1657 return nullptr;
1658 AllParams.push_back(NewParam);
1659 SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument(
1660 SemaRef.Context.getInjectedTemplateArg(NewParam)));
1661 }
1662 TemplateParams = TemplateParameterList::Create(
1663 SemaRef.Context, InnerParams->getTemplateLoc(),
1664 InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(),
1665 /*FIXME: RequiresClause*/ nullptr);
1666 }
1667
1668 // If we built a new template-parameter-list, track that we need to
1669 // substitute references to the old parameters into references to the
1670 // new ones.
1671 MultiLevelTemplateArgumentList Args;
1672 if (FTD) {
1673 Args.addOuterTemplateArguments(SubstArgs);
1674 Args.addOuterRetainedLevel();
1675 }
1676
1677 FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc()
1678 .getAsAdjusted<FunctionProtoTypeLoc>();
1679 assert(FPTL && "no prototype for constructor declaration")(static_cast <bool> (FPTL && "no prototype for constructor declaration"
) ? void (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1679, __extension__ __PRETTY_FUNCTION__))
;
1680
1681 // Transform the type of the function, adjusting the return type and
1682 // replacing references to the old parameters with references to the
1683 // new ones.
1684 TypeLocBuilder TLB;
1685 SmallVector<ParmVarDecl*, 8> Params;
1686 QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args);
1687 if (NewType.isNull())
1688 return nullptr;
1689 TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType);
1690
1691 return buildDeductionGuide(TemplateParams, CD->isExplicit(), NewTInfo,
1692 CD->getLocStart(), CD->getLocation(),
1693 CD->getLocEnd());
1694 }
1695
1696 /// Build a deduction guide with the specified parameter types.
1697 NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) {
1698 SourceLocation Loc = Template->getLocation();
1699
1700 // Build the requested type.
1701 FunctionProtoType::ExtProtoInfo EPI;
1702 EPI.HasTrailingReturn = true;
1703 QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc,
1704 DeductionGuideName, EPI);
1705 TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc);
1706
1707 FunctionProtoTypeLoc FPTL =
1708 TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>();
1709
1710 // Build the parameters, needed during deduction / substitution.
1711 SmallVector<ParmVarDecl*, 4> Params;
1712 for (auto T : ParamTypes) {
1713 ParmVarDecl *NewParam = ParmVarDecl::Create(
1714 SemaRef.Context, DC, Loc, Loc, nullptr, T,
1715 SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr);
1716 NewParam->setScopeInfo(0, Params.size());
1717 FPTL.setParam(Params.size(), NewParam);
1718 Params.push_back(NewParam);
1719 }
1720
1721 return buildDeductionGuide(Template->getTemplateParameters(), false, TSI,
1722 Loc, Loc, Loc);
1723 }
1724
1725private:
1726 /// Transform a constructor template parameter into a deduction guide template
1727 /// parameter, rebuilding any internal references to earlier parameters and
1728 /// renumbering as we go.
1729 NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam,
1730 MultiLevelTemplateArgumentList &Args) {
1731 if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) {
1732 // TemplateTypeParmDecl's index cannot be changed after creation, so
1733 // substitute it directly.
1734 auto *NewTTP = TemplateTypeParmDecl::Create(
1735 SemaRef.Context, DC, TTP->getLocStart(), TTP->getLocation(),
1736 /*Depth*/0, Depth1IndexAdjustment + TTP->getIndex(),
1737 TTP->getIdentifier(), TTP->wasDeclaredWithTypename(),
1738 TTP->isParameterPack());
1739 if (TTP->hasDefaultArgument()) {
1740 TypeSourceInfo *InstantiatedDefaultArg =
1741 SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args,
1742 TTP->getDefaultArgumentLoc(), TTP->getDeclName());
1743 if (InstantiatedDefaultArg)
1744 NewTTP->setDefaultArgument(InstantiatedDefaultArg);
1745 }
1746 SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam,
1747 NewTTP);
1748 return NewTTP;
1749 }
1750
1751 if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam))
1752 return transformTemplateParameterImpl(TTP, Args);
1753
1754 return transformTemplateParameterImpl(
1755 cast<NonTypeTemplateParmDecl>(TemplateParam), Args);
1756 }
1757 template<typename TemplateParmDecl>
1758 TemplateParmDecl *
1759 transformTemplateParameterImpl(TemplateParmDecl *OldParam,
1760 MultiLevelTemplateArgumentList &Args) {
1761 // Ask the template instantiator to do the heavy lifting for us, then adjust
1762 // the index of the parameter once it's done.
1763 auto *NewParam =
1764 cast_or_null<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args));
1765 assert(NewParam->getDepth() == 0 && "unexpected template param depth")(static_cast <bool> (NewParam->getDepth() == 0 &&
"unexpected template param depth") ? void (0) : __assert_fail
("NewParam->getDepth() == 0 && \"unexpected template param depth\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1765, __extension__ __PRETTY_FUNCTION__))
;
1766 NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment);
1767 return NewParam;
1768 }
1769
1770 QualType transformFunctionProtoType(TypeLocBuilder &TLB,
1771 FunctionProtoTypeLoc TL,
1772 SmallVectorImpl<ParmVarDecl*> &Params,
1773 MultiLevelTemplateArgumentList &Args) {
1774 SmallVector<QualType, 4> ParamTypes;
1775 const FunctionProtoType *T = TL.getTypePtr();
1776
1777 // -- The types of the function parameters are those of the constructor.
1778 for (auto *OldParam : TL.getParams()) {
1779 ParmVarDecl *NewParam = transformFunctionTypeParam(OldParam, Args);
1780 if (!NewParam)
1781 return QualType();
1782 ParamTypes.push_back(NewParam->getType());
1783 Params.push_back(NewParam);
1784 }
1785
1786 // -- The return type is the class template specialization designated by
1787 // the template-name and template arguments corresponding to the
1788 // template parameters obtained from the class template.
1789 //
1790 // We use the injected-class-name type of the primary template instead.
1791 // This has the convenient property that it is different from any type that
1792 // the user can write in a deduction-guide (because they cannot enter the
1793 // context of the template), so implicit deduction guides can never collide
1794 // with explicit ones.
1795 QualType ReturnType = DeducedType;
1796 TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation());
1797
1798 // Resolving a wording defect, we also inherit the variadicness of the
1799 // constructor.
1800 FunctionProtoType::ExtProtoInfo EPI;
1801 EPI.Variadic = T->isVariadic();
1802 EPI.HasTrailingReturn = true;
1803
1804 QualType Result = SemaRef.BuildFunctionType(
1805 ReturnType, ParamTypes, TL.getLocStart(), DeductionGuideName, EPI);
1806 if (Result.isNull())
1807 return QualType();
1808
1809 FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result);
1810 NewTL.setLocalRangeBegin(TL.getLocalRangeBegin());
1811 NewTL.setLParenLoc(TL.getLParenLoc());
1812 NewTL.setRParenLoc(TL.getRParenLoc());
1813 NewTL.setExceptionSpecRange(SourceRange());
1814 NewTL.setLocalRangeEnd(TL.getLocalRangeEnd());
1815 for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I)
1816 NewTL.setParam(I, Params[I]);
1817
1818 return Result;
1819 }
1820
1821 ParmVarDecl *
1822 transformFunctionTypeParam(ParmVarDecl *OldParam,
1823 MultiLevelTemplateArgumentList &Args) {
1824 TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo();
1825 TypeSourceInfo *NewDI;
1826 if (!Args.getNumLevels())
1827 NewDI = OldDI;
1828 else if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) {
1829 // Expand out the one and only element in each inner pack.
1830 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0);
1831 NewDI =
1832 SemaRef.SubstType(PackTL.getPatternLoc(), Args,
1833 OldParam->getLocation(), OldParam->getDeclName());
1834 if (!NewDI) return nullptr;
1835 NewDI =
1836 SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(),
1837 PackTL.getTypePtr()->getNumExpansions());
1838 } else
1839 NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(),
1840 OldParam->getDeclName());
1841 if (!NewDI)
1842 return nullptr;
1843
1844 // Canonicalize the type. This (for instance) replaces references to
1845 // typedef members of the current instantiations with the definitions of
1846 // those typedefs, avoiding triggering instantiation of the deduced type
1847 // during deduction.
1848 // FIXME: It would be preferable to retain type sugar and source
1849 // information here (and handle this in substitution instead).
1850 NewDI = SemaRef.Context.getTrivialTypeSourceInfo(
1851 SemaRef.Context.getCanonicalType(NewDI->getType()),
1852 OldParam->getLocation());
1853
1854 // Resolving a wording defect, we also inherit default arguments from the
1855 // constructor.
1856 ExprResult NewDefArg;
1857 if (OldParam->hasDefaultArg()) {
1858 NewDefArg = Args.getNumLevels()
1859 ? SemaRef.SubstExpr(OldParam->getDefaultArg(), Args)
1860 : OldParam->getDefaultArg();
1861 if (NewDefArg.isInvalid())
1862 return nullptr;
1863 }
1864
1865 ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC,
1866 OldParam->getInnerLocStart(),
1867 OldParam->getLocation(),
1868 OldParam->getIdentifier(),
1869 NewDI->getType(),
1870 NewDI,
1871 OldParam->getStorageClass(),
1872 NewDefArg.get());
1873 NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(),
1874 OldParam->getFunctionScopeIndex());
1875 return NewParam;
1876 }
1877
1878 NamedDecl *buildDeductionGuide(TemplateParameterList *TemplateParams,
1879 bool Explicit, TypeSourceInfo *TInfo,
1880 SourceLocation LocStart, SourceLocation Loc,
1881 SourceLocation LocEnd) {
1882 DeclarationNameInfo Name(DeductionGuideName, Loc);
1883 ArrayRef<ParmVarDecl *> Params =
1884 TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams();
1885
1886 // Build the implicit deduction guide template.
1887 auto *Guide =
1888 CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, Explicit,
1889 Name, TInfo->getType(), TInfo, LocEnd);
1890 Guide->setImplicit();
1891 Guide->setParams(Params);
1892
1893 for (auto *Param : Params)
1894 Param->setDeclContext(Guide);
1895
1896 auto *GuideTemplate = FunctionTemplateDecl::Create(
1897 SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide);
1898 GuideTemplate->setImplicit();
1899 Guide->setDescribedFunctionTemplate(GuideTemplate);
1900
1901 if (isa<CXXRecordDecl>(DC)) {
1902 Guide->setAccess(AS_public);
1903 GuideTemplate->setAccess(AS_public);
1904 }
1905
1906 DC->addDecl(GuideTemplate);
1907 return GuideTemplate;
1908 }
1909};
1910}
1911
1912void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template,
1913 SourceLocation Loc) {
1914 DeclContext *DC = Template->getDeclContext();
1915 if (DC->isDependentContext())
1916 return;
1917
1918 ConvertConstructorToDeductionGuideTransform Transform(
1919 *this, cast<ClassTemplateDecl>(Template));
1920 if (!isCompleteType(Loc, Transform.DeducedType))
1921 return;
1922
1923 // Check whether we've already declared deduction guides for this template.
1924 // FIXME: Consider storing a flag on the template to indicate this.
1925 auto Existing = DC->lookup(Transform.DeductionGuideName);
1926 for (auto *D : Existing)
1927 if (D->isImplicit())
1928 return;
1929
1930 // In case we were expanding a pack when we attempted to declare deduction
1931 // guides, turn off pack expansion for everything we're about to do.
1932 ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
1933 // Create a template instantiation record to track the "instantiation" of
1934 // constructors into deduction guides.
1935 // FIXME: Add a kind for this to give more meaningful diagnostics. But can
1936 // this substitution process actually fail?
1937 InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template);
1938
1939 // Convert declared constructors into deduction guide templates.
1940 // FIXME: Skip constructors for which deduction must necessarily fail (those
1941 // for which some class template parameter without a default argument never
1942 // appears in a deduced context).
1943 bool AddedAny = false;
1944 for (NamedDecl *D : LookupConstructors(Transform.Primary)) {
1945 D = D->getUnderlyingDecl();
1946 if (D->isInvalidDecl() || D->isImplicit())
1947 continue;
1948 D = cast<NamedDecl>(D->getCanonicalDecl());
1949
1950 auto *FTD = dyn_cast<FunctionTemplateDecl>(D);
1951 auto *CD =
1952 dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D);
1953 // Class-scope explicit specializations (MS extension) do not result in
1954 // deduction guides.
1955 if (!CD || (!FTD && CD->isFunctionTemplateSpecialization()))
1956 continue;
1957
1958 Transform.transformConstructor(FTD, CD);
1959 AddedAny = true;
1960 }
1961
1962 // C++17 [over.match.class.deduct]
1963 // -- If C is not defined or does not declare any constructors, an
1964 // additional function template derived as above from a hypothetical
1965 // constructor C().
1966 if (!AddedAny)
1967 Transform.buildSimpleDeductionGuide(None);
1968
1969 // -- An additional function template derived as above from a hypothetical
1970 // constructor C(C), called the copy deduction candidate.
1971 cast<CXXDeductionGuideDecl>(
1972 cast<FunctionTemplateDecl>(
1973 Transform.buildSimpleDeductionGuide(Transform.DeducedType))
1974 ->getTemplatedDecl())
1975 ->setIsCopyDeductionCandidate();
1976}
1977
1978/// \brief Diagnose the presence of a default template argument on a
1979/// template parameter, which is ill-formed in certain contexts.
1980///
1981/// \returns true if the default template argument should be dropped.
1982static bool DiagnoseDefaultTemplateArgument(Sema &S,
1983 Sema::TemplateParamListContext TPC,
1984 SourceLocation ParamLoc,
1985 SourceRange DefArgRange) {
1986 switch (TPC) {
1987 case Sema::TPC_ClassTemplate:
1988 case Sema::TPC_VarTemplate:
1989 case Sema::TPC_TypeAliasTemplate:
1990 return false;
1991
1992 case Sema::TPC_FunctionTemplate:
1993 case Sema::TPC_FriendFunctionTemplateDefinition:
1994 // C++ [temp.param]p9:
1995 // A default template-argument shall not be specified in a
1996 // function template declaration or a function template
1997 // definition [...]
1998 // If a friend function template declaration specifies a default
1999 // template-argument, that declaration shall be a definition and shall be
2000 // the only declaration of the function template in the translation unit.
2001 // (C++98/03 doesn't have this wording; see DR226).
2002 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
2003 diag::warn_cxx98_compat_template_parameter_default_in_function_template
2004 : diag::ext_template_parameter_default_in_function_template)
2005 << DefArgRange;
2006 return false;
2007
2008 case Sema::TPC_ClassTemplateMember:
2009 // C++0x [temp.param]p9:
2010 // A default template-argument shall not be specified in the
2011 // template-parameter-lists of the definition of a member of a
2012 // class template that appears outside of the member's class.
2013 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
2014 << DefArgRange;
2015 return true;
2016
2017 case Sema::TPC_FriendClassTemplate:
2018 case Sema::TPC_FriendFunctionTemplate:
2019 // C++ [temp.param]p9:
2020 // A default template-argument shall not be specified in a
2021 // friend template declaration.
2022 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
2023 << DefArgRange;
2024 return true;
2025
2026 // FIXME: C++0x [temp.param]p9 allows default template-arguments
2027 // for friend function templates if there is only a single
2028 // declaration (and it is a definition). Strange!
2029 }
2030
2031 llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2031)
;
2032}
2033
2034/// \brief Check for unexpanded parameter packs within the template parameters
2035/// of a template template parameter, recursively.
2036static bool DiagnoseUnexpandedParameterPacks(Sema &S,
2037 TemplateTemplateParmDecl *TTP) {
2038 // A template template parameter which is a parameter pack is also a pack
2039 // expansion.
2040 if (TTP->isParameterPack())
2041 return false;
2042
2043 TemplateParameterList *Params = TTP->getTemplateParameters();
2044 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
2045 NamedDecl *P = Params->getParam(I);
2046 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
2047 if (!NTTP->isParameterPack() &&
2048 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
2049 NTTP->getTypeSourceInfo(),
2050 Sema::UPPC_NonTypeTemplateParameterType))
2051 return true;
2052
2053 continue;
2054 }
2055
2056 if (TemplateTemplateParmDecl *InnerTTP
2057 = dyn_cast<TemplateTemplateParmDecl>(P))
2058 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
2059 return true;
2060 }
2061
2062 return false;
2063}
2064
2065/// \brief Checks the validity of a template parameter list, possibly
2066/// considering the template parameter list from a previous
2067/// declaration.
2068///
2069/// If an "old" template parameter list is provided, it must be
2070/// equivalent (per TemplateParameterListsAreEqual) to the "new"
2071/// template parameter list.
2072///
2073/// \param NewParams Template parameter list for a new template
2074/// declaration. This template parameter list will be updated with any
2075/// default arguments that are carried through from the previous
2076/// template parameter list.
2077///
2078/// \param OldParams If provided, template parameter list from a
2079/// previous declaration of the same template. Default template
2080/// arguments will be merged from the old template parameter list to
2081/// the new template parameter list.
2082///
2083/// \param TPC Describes the context in which we are checking the given
2084/// template parameter list.
2085///
2086/// \returns true if an error occurred, false otherwise.
2087bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
2088 TemplateParameterList *OldParams,
2089 TemplateParamListContext TPC) {
2090 bool Invalid = false;
2091
2092 // C++ [temp.param]p10:
2093 // The set of default template-arguments available for use with a
2094 // template declaration or definition is obtained by merging the
2095 // default arguments from the definition (if in scope) and all
2096 // declarations in scope in the same way default function
2097 // arguments are (8.3.6).
2098 bool SawDefaultArgument = false;
2099 SourceLocation PreviousDefaultArgLoc;
2100
2101 // Dummy initialization to avoid warnings.
2102 TemplateParameterList::iterator OldParam = NewParams->end();
2103 if (OldParams)
2104 OldParam = OldParams->begin();
2105
2106 bool RemoveDefaultArguments = false;
2107 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2108 NewParamEnd = NewParams->end();
2109 NewParam != NewParamEnd; ++NewParam) {
2110 // Variables used to diagnose redundant default arguments
2111 bool RedundantDefaultArg = false;
2112 SourceLocation OldDefaultLoc;
2113 SourceLocation NewDefaultLoc;
2114
2115 // Variable used to diagnose missing default arguments
2116 bool MissingDefaultArg = false;
2117
2118 // Variable used to diagnose non-final parameter packs
2119 bool SawParameterPack = false;
2120
2121 if (TemplateTypeParmDecl *NewTypeParm
2122 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
2123 // Check the presence of a default argument here.
2124 if (NewTypeParm->hasDefaultArgument() &&
2125 DiagnoseDefaultTemplateArgument(*this, TPC,
2126 NewTypeParm->getLocation(),
2127 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
2128 .getSourceRange()))
2129 NewTypeParm->removeDefaultArgument();
2130
2131 // Merge default arguments for template type parameters.
2132 TemplateTypeParmDecl *OldTypeParm
2133 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr;
2134 if (NewTypeParm->isParameterPack()) {
2135 assert(!NewTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2136, __extension__ __PRETTY_FUNCTION__))
2136 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2136, __extension__ __PRETTY_FUNCTION__))
;
2137 SawParameterPack = true;
2138 } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) &&
2139 NewTypeParm->hasDefaultArgument()) {
2140 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
2141 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
2142 SawDefaultArgument = true;
2143 RedundantDefaultArg = true;
2144 PreviousDefaultArgLoc = NewDefaultLoc;
2145 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
2146 // Merge the default argument from the old declaration to the
2147 // new declaration.
2148 NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm);
2149 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
2150 } else if (NewTypeParm->hasDefaultArgument()) {
2151 SawDefaultArgument = true;
2152 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
2153 } else if (SawDefaultArgument)
2154 MissingDefaultArg = true;
2155 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
2156 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
2157 // Check for unexpanded parameter packs.
2158 if (!NewNonTypeParm->isParameterPack() &&
2159 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
2160 NewNonTypeParm->getTypeSourceInfo(),
2161 UPPC_NonTypeTemplateParameterType)) {
2162 Invalid = true;
2163 continue;
2164 }
2165
2166 // Check the presence of a default argument here.
2167 if (NewNonTypeParm->hasDefaultArgument() &&
2168 DiagnoseDefaultTemplateArgument(*this, TPC,
2169 NewNonTypeParm->getLocation(),
2170 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
2171 NewNonTypeParm->removeDefaultArgument();
2172 }
2173
2174 // Merge default arguments for non-type template parameters
2175 NonTypeTemplateParmDecl *OldNonTypeParm
2176 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr;
2177 if (NewNonTypeParm->isParameterPack()) {
2178 assert(!NewNonTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2179, __extension__ __PRETTY_FUNCTION__))
2179 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2179, __extension__ __PRETTY_FUNCTION__))
;
2180 if (!NewNonTypeParm->isPackExpansion())
2181 SawParameterPack = true;
2182 } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) &&
2183 NewNonTypeParm->hasDefaultArgument()) {
2184 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
2185 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
2186 SawDefaultArgument = true;
2187 RedundantDefaultArg = true;
2188 PreviousDefaultArgLoc = NewDefaultLoc;
2189 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
2190 // Merge the default argument from the old declaration to the
2191 // new declaration.
2192 NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm);
2193 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
2194 } else if (NewNonTypeParm->hasDefaultArgument()) {
2195 SawDefaultArgument = true;
2196 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
2197 } else if (SawDefaultArgument)
2198 MissingDefaultArg = true;
2199 } else {
2200 TemplateTemplateParmDecl *NewTemplateParm
2201 = cast<TemplateTemplateParmDecl>(*NewParam);
2202
2203 // Check for unexpanded parameter packs, recursively.
2204 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
2205 Invalid = true;
2206 continue;
2207 }
2208
2209 // Check the presence of a default argument here.
2210 if (NewTemplateParm->hasDefaultArgument() &&
2211 DiagnoseDefaultTemplateArgument(*this, TPC,
2212 NewTemplateParm->getLocation(),
2213 NewTemplateParm->getDefaultArgument().getSourceRange()))
2214 NewTemplateParm->removeDefaultArgument();
2215
2216 // Merge default arguments for template template parameters
2217 TemplateTemplateParmDecl *OldTemplateParm
2218 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr;
2219 if (NewTemplateParm->isParameterPack()) {
2220 assert(!NewTemplateParm->hasDefaultArgument() &&(static_cast <bool> (!NewTemplateParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2221, __extension__ __PRETTY_FUNCTION__))
2221 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTemplateParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2221, __extension__ __PRETTY_FUNCTION__))
;
2222 if (!NewTemplateParm->isPackExpansion())
2223 SawParameterPack = true;
2224 } else if (OldTemplateParm &&
2225 hasVisibleDefaultArgument(OldTemplateParm) &&
2226 NewTemplateParm->hasDefaultArgument()) {
2227 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
2228 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
2229 SawDefaultArgument = true;
2230 RedundantDefaultArg = true;
2231 PreviousDefaultArgLoc = NewDefaultLoc;
2232 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
2233 // Merge the default argument from the old declaration to the
2234 // new declaration.
2235 NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm);
2236 PreviousDefaultArgLoc
2237 = OldTemplateParm->getDefaultArgument().getLocation();
2238 } else if (NewTemplateParm->hasDefaultArgument()) {
2239 SawDefaultArgument = true;
2240 PreviousDefaultArgLoc
2241 = NewTemplateParm->getDefaultArgument().getLocation();
2242 } else if (SawDefaultArgument)
2243 MissingDefaultArg = true;
2244 }
2245
2246 // C++11 [temp.param]p11:
2247 // If a template parameter of a primary class template or alias template
2248 // is a template parameter pack, it shall be the last template parameter.
2249 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
2250 (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate ||
2251 TPC == TPC_TypeAliasTemplate)) {
2252 Diag((*NewParam)->getLocation(),
2253 diag::err_template_param_pack_must_be_last_template_parameter);
2254 Invalid = true;
2255 }
2256
2257 if (RedundantDefaultArg) {
2258 // C++ [temp.param]p12:
2259 // A template-parameter shall not be given default arguments
2260 // by two different declarations in the same scope.
2261 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
2262 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
2263 Invalid = true;
2264 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
2265 // C++ [temp.param]p11:
2266 // If a template-parameter of a class template has a default
2267 // template-argument, each subsequent template-parameter shall either
2268 // have a default template-argument supplied or be a template parameter
2269 // pack.
2270 Diag((*NewParam)->getLocation(),
2271 diag::err_template_param_default_arg_missing);
2272 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
2273 Invalid = true;
2274 RemoveDefaultArguments = true;
2275 }
2276
2277 // If we have an old template parameter list that we're merging
2278 // in, move on to the next parameter.
2279 if (OldParams)
2280 ++OldParam;
2281 }
2282
2283 // We were missing some default arguments at the end of the list, so remove
2284 // all of the default arguments.
2285 if (RemoveDefaultArguments) {
2286 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2287 NewParamEnd = NewParams->end();
2288 NewParam != NewParamEnd; ++NewParam) {
2289 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
2290 TTP->removeDefaultArgument();
2291 else if (NonTypeTemplateParmDecl *NTTP
2292 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
2293 NTTP->removeDefaultArgument();
2294 else
2295 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
2296 }
2297 }
2298
2299 return Invalid;
2300}
2301
2302namespace {
2303
2304/// A class which looks for a use of a certain level of template
2305/// parameter.
2306struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
2307 typedef RecursiveASTVisitor<DependencyChecker> super;
2308
2309 unsigned Depth;
2310
2311 // Whether we're looking for a use of a template parameter that makes the
2312 // overall construct type-dependent / a dependent type. This is strictly
2313 // best-effort for now; we may fail to match at all for a dependent type
2314 // in some cases if this is set.
2315 bool IgnoreNonTypeDependent;
2316
2317 bool Match;
2318 SourceLocation MatchLoc;
2319
2320 DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent)
2321 : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent),
2322 Match(false) {}
2323
2324 DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent)
2325 : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) {
2326 NamedDecl *ND = Params->getParam(0);
2327 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
2328 Depth = PD->getDepth();
2329 } else if (NonTypeTemplateParmDecl *PD =
2330 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
2331 Depth = PD->getDepth();
2332 } else {
2333 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
2334 }
2335 }
2336
2337 bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) {
2338 if (ParmDepth >= Depth) {
2339 Match = true;
2340 MatchLoc = Loc;
2341 return true;
2342 }
2343 return false;
2344 }
2345
2346 bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) {
2347 // Prune out non-type-dependent expressions if requested. This can
2348 // sometimes result in us failing to find a template parameter reference
2349 // (if a value-dependent expression creates a dependent type), but this
2350 // mode is best-effort only.
2351 if (auto *E = dyn_cast_or_null<Expr>(S))
2352 if (IgnoreNonTypeDependent && !E->isTypeDependent())
2353 return true;
2354 return super::TraverseStmt(S, Q);
2355 }
2356
2357 bool TraverseTypeLoc(TypeLoc TL) {
2358 if (IgnoreNonTypeDependent && !TL.isNull() &&
2359 !TL.getType()->isDependentType())
2360 return true;
2361 return super::TraverseTypeLoc(TL);
2362 }
2363
2364 bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
2365 return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc());
2366 }
2367
2368 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
2369 // For a best-effort search, keep looking until we find a location.
2370 return IgnoreNonTypeDependent || !Matches(T->getDepth());
2371 }
2372
2373 bool TraverseTemplateName(TemplateName N) {
2374 if (TemplateTemplateParmDecl *PD =
2375 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
2376 if (Matches(PD->getDepth()))
2377 return false;
2378 return super::TraverseTemplateName(N);
2379 }
2380
2381 bool VisitDeclRefExpr(DeclRefExpr *E) {
2382 if (NonTypeTemplateParmDecl *PD =
2383 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl()))
2384 if (Matches(PD->getDepth(), E->getExprLoc()))
2385 return false;
2386 return super::VisitDeclRefExpr(E);
2387 }
2388
2389 bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
2390 return TraverseType(T->getReplacementType());
2391 }
2392
2393 bool
2394 VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
2395 return TraverseTemplateArgument(T->getArgumentPack());
2396 }
2397
2398 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
2399 return TraverseType(T->getInjectedSpecializationType());
2400 }
2401};
2402} // end anonymous namespace
2403
2404/// Determines whether a given type depends on the given parameter
2405/// list.
2406static bool
2407DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
2408 DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false);
2409 Checker.TraverseType(T);
2410 return Checker.Match;
2411}
2412
2413// Find the source range corresponding to the named type in the given
2414// nested-name-specifier, if any.
2415static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
2416 QualType T,
2417 const CXXScopeSpec &SS) {
2418 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
2419 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
2420 if (const Type *CurType = NNS->getAsType()) {
2421 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
2422 return NNSLoc.getTypeLoc().getSourceRange();
2423 } else
2424 break;
2425
2426 NNSLoc = NNSLoc.getPrefix();
2427 }
2428
2429 return SourceRange();
2430}
2431
2432/// \brief Match the given template parameter lists to the given scope
2433/// specifier, returning the template parameter list that applies to the
2434/// name.
2435///
2436/// \param DeclStartLoc the start of the declaration that has a scope
2437/// specifier or a template parameter list.
2438///
2439/// \param DeclLoc The location of the declaration itself.
2440///
2441/// \param SS the scope specifier that will be matched to the given template
2442/// parameter lists. This scope specifier precedes a qualified name that is
2443/// being declared.
2444///
2445/// \param TemplateId The template-id following the scope specifier, if there
2446/// is one. Used to check for a missing 'template<>'.
2447///
2448/// \param ParamLists the template parameter lists, from the outermost to the
2449/// innermost template parameter lists.
2450///
2451/// \param IsFriend Whether to apply the slightly different rules for
2452/// matching template parameters to scope specifiers in friend
2453/// declarations.
2454///
2455/// \param IsMemberSpecialization will be set true if the scope specifier
2456/// denotes a fully-specialized type, and therefore this is a declaration of
2457/// a member specialization.
2458///
2459/// \returns the template parameter list, if any, that corresponds to the
2460/// name that is preceded by the scope specifier @p SS. This template
2461/// parameter list may have template parameters (if we're declaring a
2462/// template) or may have no template parameters (if we're declaring a
2463/// template specialization), or may be NULL (if what we're declaring isn't
2464/// itself a template).
2465TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
2466 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
2467 TemplateIdAnnotation *TemplateId,
2468 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
2469 bool &IsMemberSpecialization, bool &Invalid) {
2470 IsMemberSpecialization = false;
2471 Invalid = false;
2472
2473 // The sequence of nested types to which we will match up the template
2474 // parameter lists. We first build this list by starting with the type named
2475 // by the nested-name-specifier and walking out until we run out of types.
2476 SmallVector<QualType, 4> NestedTypes;
2477 QualType T;
2478 if (SS.getScopeRep()) {
2479 if (CXXRecordDecl *Record
2480 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
2481 T = Context.getTypeDeclType(Record);
2482 else
2483 T = QualType(SS.getScopeRep()->getAsType(), 0);
2484 }
2485
2486 // If we found an explicit specialization that prevents us from needing
2487 // 'template<>' headers, this will be set to the location of that
2488 // explicit specialization.
2489 SourceLocation ExplicitSpecLoc;
2490
2491 while (!T.isNull()) {
2492 NestedTypes.push_back(T);
2493
2494 // Retrieve the parent of a record type.
2495 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2496 // If this type is an explicit specialization, we're done.
2497 if (ClassTemplateSpecializationDecl *Spec
2498 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2499 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
2500 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
2501 ExplicitSpecLoc = Spec->getLocation();
2502 break;
2503 }
2504 } else if (Record->getTemplateSpecializationKind()
2505 == TSK_ExplicitSpecialization) {
2506 ExplicitSpecLoc = Record->getLocation();
2507 break;
2508 }
2509
2510 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
2511 T = Context.getTypeDeclType(Parent);
2512 else
2513 T = QualType();
2514 continue;
2515 }
2516
2517 if (const TemplateSpecializationType *TST
2518 = T->getAs<TemplateSpecializationType>()) {
2519 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2520 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
2521 T = Context.getTypeDeclType(Parent);
2522 else
2523 T = QualType();
2524 continue;
2525 }
2526 }
2527
2528 // Look one step prior in a dependent template specialization type.
2529 if (const DependentTemplateSpecializationType *DependentTST
2530 = T->getAs<DependentTemplateSpecializationType>()) {
2531 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
2532 T = QualType(NNS->getAsType(), 0);
2533 else
2534 T = QualType();
2535 continue;
2536 }
2537
2538 // Look one step prior in a dependent name type.
2539 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
2540 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
2541 T = QualType(NNS->getAsType(), 0);
2542 else
2543 T = QualType();
2544 continue;
2545 }
2546
2547 // Retrieve the parent of an enumeration type.
2548 if (const EnumType *EnumT = T->getAs<EnumType>()) {
2549 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
2550 // check here.
2551 EnumDecl *Enum = EnumT->getDecl();
2552
2553 // Get to the parent type.
2554 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
2555 T = Context.getTypeDeclType(Parent);
2556 else
2557 T = QualType();
2558 continue;
2559 }
2560
2561 T = QualType();
2562 }
2563 // Reverse the nested types list, since we want to traverse from the outermost
2564 // to the innermost while checking template-parameter-lists.
2565 std::reverse(NestedTypes.begin(), NestedTypes.end());
2566
2567 // C++0x [temp.expl.spec]p17:
2568 // A member or a member template may be nested within many
2569 // enclosing class templates. In an explicit specialization for
2570 // such a member, the member declaration shall be preceded by a
2571 // template<> for each enclosing class template that is
2572 // explicitly specialized.
2573 bool SawNonEmptyTemplateParameterList = false;
2574
2575 auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) {
2576 if (SawNonEmptyTemplateParameterList) {
2577 Diag(DeclLoc, diag::err_specialize_member_of_template)
2578 << !Recovery << Range;
2579 Invalid = true;
2580 IsMemberSpecialization = false;
2581 return true;
2582 }
2583
2584 return false;
2585 };
2586
2587 auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) {
2588 // Check that we can have an explicit specialization here.
2589 if (CheckExplicitSpecialization(Range, true))
2590 return true;
2591
2592 // We don't have a template header, but we should.
2593 SourceLocation ExpectedTemplateLoc;
2594 if (!ParamLists.empty())
2595 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
2596 else
2597 ExpectedTemplateLoc = DeclStartLoc;
2598
2599 Diag(DeclLoc, diag::err_template_spec_needs_header)
2600 << Range
2601 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
2602 return false;
2603 };
2604
2605 unsigned ParamIdx = 0;
2606 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
2607 ++TypeIdx) {
2608 T = NestedTypes[TypeIdx];
2609
2610 // Whether we expect a 'template<>' header.
2611 bool NeedEmptyTemplateHeader = false;
2612
2613 // Whether we expect a template header with parameters.
2614 bool NeedNonemptyTemplateHeader = false;
2615
2616 // For a dependent type, the set of template parameters that we
2617 // expect to see.
2618 TemplateParameterList *ExpectedTemplateParams = nullptr;
2619
2620 // C++0x [temp.expl.spec]p15:
2621 // A member or a member template may be nested within many enclosing
2622 // class templates. In an explicit specialization for such a member, the
2623 // member declaration shall be preceded by a template<> for each
2624 // enclosing class template that is explicitly specialized.
2625 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2626 if (ClassTemplatePartialSpecializationDecl *Partial
2627 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2628 ExpectedTemplateParams = Partial->getTemplateParameters();
2629 NeedNonemptyTemplateHeader = true;
2630 } else if (Record->isDependentType()) {
2631 if (Record->getDescribedClassTemplate()) {
2632 ExpectedTemplateParams = Record->getDescribedClassTemplate()
2633 ->getTemplateParameters();
2634 NeedNonemptyTemplateHeader = true;
2635 }
2636 } else if (ClassTemplateSpecializationDecl *Spec
2637 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2638 // C++0x [temp.expl.spec]p4:
2639 // Members of an explicitly specialized class template are defined
2640 // in the same manner as members of normal classes, and not using
2641 // the template<> syntax.
2642 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
2643 NeedEmptyTemplateHeader = true;
2644 else
2645 continue;
2646 } else if (Record->getTemplateSpecializationKind()) {
2647 if (Record->getTemplateSpecializationKind()
2648 != TSK_ExplicitSpecialization &&
2649 TypeIdx == NumTypes - 1)
2650 IsMemberSpecialization = true;
2651
2652 continue;
2653 }
2654 } else if (const TemplateSpecializationType *TST
2655 = T->getAs<TemplateSpecializationType>()) {
2656 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2657 ExpectedTemplateParams = Template->getTemplateParameters();
2658 NeedNonemptyTemplateHeader = true;
2659 }
2660 } else if (T->getAs<DependentTemplateSpecializationType>()) {
2661 // FIXME: We actually could/should check the template arguments here
2662 // against the corresponding template parameter list.
2663 NeedNonemptyTemplateHeader = false;
2664 }
2665
2666 // C++ [temp.expl.spec]p16:
2667 // In an explicit specialization declaration for a member of a class
2668 // template or a member template that ap- pears in namespace scope, the
2669 // member template and some of its enclosing class templates may remain
2670 // unspecialized, except that the declaration shall not explicitly
2671 // specialize a class member template if its en- closing class templates
2672 // are not explicitly specialized as well.
2673 if (ParamIdx < ParamLists.size()) {
2674 if (ParamLists[ParamIdx]->size() == 0) {
2675 if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2676 false))
2677 return nullptr;
2678 } else
2679 SawNonEmptyTemplateParameterList = true;
2680 }
2681
2682 if (NeedEmptyTemplateHeader) {
2683 // If we're on the last of the types, and we need a 'template<>' header
2684 // here, then it's a member specialization.
2685 if (TypeIdx == NumTypes - 1)
2686 IsMemberSpecialization = true;
2687
2688 if (ParamIdx < ParamLists.size()) {
2689 if (ParamLists[ParamIdx]->size() > 0) {
2690 // The header has template parameters when it shouldn't. Complain.
2691 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2692 diag::err_template_param_list_matches_nontemplate)
2693 << T
2694 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
2695 ParamLists[ParamIdx]->getRAngleLoc())
2696 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2697 Invalid = true;
2698 return nullptr;
2699 }
2700
2701 // Consume this template header.
2702 ++ParamIdx;
2703 continue;
2704 }
2705
2706 if (!IsFriend)
2707 if (DiagnoseMissingExplicitSpecialization(
2708 getRangeOfTypeInNestedNameSpecifier(Context, T, SS)))
2709 return nullptr;
2710
2711 continue;
2712 }
2713
2714 if (NeedNonemptyTemplateHeader) {
2715 // In friend declarations we can have template-ids which don't
2716 // depend on the corresponding template parameter lists. But
2717 // assume that empty parameter lists are supposed to match this
2718 // template-id.
2719 if (IsFriend && T->isDependentType()) {
2720 if (ParamIdx < ParamLists.size() &&
2721 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
2722 ExpectedTemplateParams = nullptr;
2723 else
2724 continue;
2725 }
2726
2727 if (ParamIdx < ParamLists.size()) {
2728 // Check the template parameter list, if we can.
2729 if (ExpectedTemplateParams &&
2730 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
2731 ExpectedTemplateParams,
2732 true, TPL_TemplateMatch))
2733 Invalid = true;
2734
2735 if (!Invalid &&
2736 CheckTemplateParameterList(ParamLists[ParamIdx], nullptr,
2737 TPC_ClassTemplateMember))
2738 Invalid = true;
2739
2740 ++ParamIdx;
2741 continue;
2742 }
2743
2744 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
2745 << T
2746 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2747 Invalid = true;
2748 continue;
2749 }
2750 }
2751
2752 // If there were at least as many template-ids as there were template
2753 // parameter lists, then there are no template parameter lists remaining for
2754 // the declaration itself.
2755 if (ParamIdx >= ParamLists.size()) {
2756 if (TemplateId && !IsFriend) {
2757 // We don't have a template header for the declaration itself, but we
2758 // should.
2759 DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc,
2760 TemplateId->RAngleLoc));
2761
2762 // Fabricate an empty template parameter list for the invented header.
2763 return TemplateParameterList::Create(Context, SourceLocation(),
2764 SourceLocation(), None,
2765 SourceLocation(), nullptr);
2766 }
2767
2768 return nullptr;
2769 }
2770
2771 // If there were too many template parameter lists, complain about that now.
2772 if (ParamIdx < ParamLists.size() - 1) {
2773 bool HasAnyExplicitSpecHeader = false;
2774 bool AllExplicitSpecHeaders = true;
2775 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
2776 if (ParamLists[I]->size() == 0)
2777 HasAnyExplicitSpecHeader = true;
2778 else
2779 AllExplicitSpecHeaders = false;
2780 }
2781
2782 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2783 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
2784 : diag::err_template_spec_extra_headers)
2785 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
2786 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
2787
2788 // If there was a specialization somewhere, such that 'template<>' is
2789 // not required, and there were any 'template<>' headers, note where the
2790 // specialization occurred.
2791 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
2792 Diag(ExplicitSpecLoc,
2793 diag::note_explicit_template_spec_does_not_need_header)
2794 << NestedTypes.back();
2795
2796 // We have a template parameter list with no corresponding scope, which
2797 // means that the resulting template declaration can't be instantiated
2798 // properly (we'll end up with dependent nodes when we shouldn't).
2799 if (!AllExplicitSpecHeaders)
2800 Invalid = true;
2801 }
2802
2803 // C++ [temp.expl.spec]p16:
2804 // In an explicit specialization declaration for a member of a class
2805 // template or a member template that ap- pears in namespace scope, the
2806 // member template and some of its enclosing class templates may remain
2807 // unspecialized, except that the declaration shall not explicitly
2808 // specialize a class member template if its en- closing class templates
2809 // are not explicitly specialized as well.
2810 if (ParamLists.back()->size() == 0 &&
2811 CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2812 false))
2813 return nullptr;
2814
2815 // Return the last template parameter list, which corresponds to the
2816 // entity being declared.
2817 return ParamLists.back();
2818}
2819
2820void Sema::NoteAllFoundTemplates(TemplateName Name) {
2821 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
2822 Diag(Template->getLocation(), diag::note_template_declared_here)
2823 << (isa<FunctionTemplateDecl>(Template)
2824 ? 0
2825 : isa<ClassTemplateDecl>(Template)
2826 ? 1
2827 : isa<VarTemplateDecl>(Template)
2828 ? 2
2829 : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4)
2830 << Template->getDeclName();
2831 return;
2832 }
2833
2834 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
2835 for (OverloadedTemplateStorage::iterator I = OST->begin(),
2836 IEnd = OST->end();
2837 I != IEnd; ++I)
2838 Diag((*I)->getLocation(), diag::note_template_declared_here)
2839 << 0 << (*I)->getDeclName();
2840
2841 return;
2842 }
2843}
2844
2845static QualType
2846checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD,
2847 const SmallVectorImpl<TemplateArgument> &Converted,
2848 SourceLocation TemplateLoc,
2849 TemplateArgumentListInfo &TemplateArgs) {
2850 ASTContext &Context = SemaRef.getASTContext();
2851 switch (BTD->getBuiltinTemplateKind()) {
2852 case BTK__make_integer_seq: {
2853 // Specializations of __make_integer_seq<S, T, N> are treated like
2854 // S<T, 0, ..., N-1>.
2855
2856 // C++14 [inteseq.intseq]p1:
2857 // T shall be an integer type.
2858 if (!Converted[1].getAsType()->isIntegralType(Context)) {
2859 SemaRef.Diag(TemplateArgs[1].getLocation(),
2860 diag::err_integer_sequence_integral_element_type);
2861 return QualType();
2862 }
2863
2864 // C++14 [inteseq.make]p1:
2865 // If N is negative the program is ill-formed.
2866 TemplateArgument NumArgsArg = Converted[2];
2867 llvm::APSInt NumArgs = NumArgsArg.getAsIntegral();
2868 if (NumArgs < 0) {
2869 SemaRef.Diag(TemplateArgs[2].getLocation(),
2870 diag::err_integer_sequence_negative_length);
2871 return QualType();
2872 }
2873
2874 QualType ArgTy = NumArgsArg.getIntegralType();
2875 TemplateArgumentListInfo SyntheticTemplateArgs;
2876 // The type argument gets reused as the first template argument in the
2877 // synthetic template argument list.
2878 SyntheticTemplateArgs.addArgument(TemplateArgs[1]);
2879 // Expand N into 0 ... N-1.
2880 for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned());
2881 I < NumArgs; ++I) {
2882 TemplateArgument TA(Context, I, ArgTy);
2883 SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc(
2884 TA, ArgTy, TemplateArgs[2].getLocation()));
2885 }
2886 // The first template argument will be reused as the template decl that
2887 // our synthetic template arguments will be applied to.
2888 return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(),
2889 TemplateLoc, SyntheticTemplateArgs);
2890 }
2891
2892 case BTK__type_pack_element:
2893 // Specializations of
2894 // __type_pack_element<Index, T_1, ..., T_N>
2895 // are treated like T_Index.
2896 assert(Converted.size() == 2 &&(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2897, __extension__ __PRETTY_FUNCTION__))
2897 "__type_pack_element should be given an index and a parameter pack")(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2897, __extension__ __PRETTY_FUNCTION__))
;
2898
2899 // If the Index is out of bounds, the program is ill-formed.
2900 TemplateArgument IndexArg = Converted[0], Ts = Converted[1];
2901 llvm::APSInt Index = IndexArg.getAsIntegral();
2902 assert(Index >= 0 && "the index used with __type_pack_element should be of "(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? 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-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2903, __extension__ __PRETTY_FUNCTION__))
2903 "type std::size_t, and hence be non-negative")(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? 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-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2903, __extension__ __PRETTY_FUNCTION__))
;
2904 if (Index >= Ts.pack_size()) {
2905 SemaRef.Diag(TemplateArgs[0].getLocation(),
2906 diag::err_type_pack_element_out_of_bounds);
2907 return QualType();
2908 }
2909
2910 // We simply return the type at index `Index`.
2911 auto Nth = std::next(Ts.pack_begin(), Index.getExtValue());
2912 return Nth->getAsType();
2913 }
2914 llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2914)
;
2915}
2916
2917/// Determine whether this alias template is "enable_if_t".
2918static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) {
2919 return AliasTemplate->getName().equals("enable_if_t");
2920}
2921
2922/// Collect all of the separable terms in the given condition, which
2923/// might be a conjunction.
2924///
2925/// FIXME: The right answer is to convert the logical expression into
2926/// disjunctive normal form, so we can find the first failed term
2927/// within each possible clause.
2928static void collectConjunctionTerms(Expr *Clause,
2929 SmallVectorImpl<Expr *> &Terms) {
2930 if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) {
2931 if (BinOp->getOpcode() == BO_LAnd) {
2932 collectConjunctionTerms(BinOp->getLHS(), Terms);
2933 collectConjunctionTerms(BinOp->getRHS(), Terms);
2934 }
2935
2936 return;
2937 }
2938
2939 Terms.push_back(Clause);
2940}
2941
2942// The ranges-v3 library uses an odd pattern of a top-level "||" with
2943// a left-hand side that is value-dependent but never true. Identify
2944// the idiom and ignore that term.
2945static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) {
2946 // Top-level '||'.
2947 auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts());
2948 if (!BinOp) return Cond;
2949
2950 if (BinOp->getOpcode() != BO_LOr) return Cond;
2951
2952 // With an inner '==' that has a literal on the right-hand side.
2953 Expr *LHS = BinOp->getLHS();
2954 auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts());
2955 if (!InnerBinOp) return Cond;
2956
2957 if (InnerBinOp->getOpcode() != BO_EQ ||
2958 !isa<IntegerLiteral>(InnerBinOp->getRHS()))
2959 return Cond;
2960
2961 // If the inner binary operation came from a macro expansion named
2962 // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side
2963 // of the '||', which is the real, user-provided condition.
2964 SourceLocation Loc = InnerBinOp->getExprLoc();
2965 if (!Loc.isMacroID()) return Cond;
2966
2967 StringRef MacroName = PP.getImmediateMacroName(Loc);
2968 if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_")
2969 return BinOp->getRHS();
2970
2971 return Cond;
2972}
2973
2974std::pair<Expr *, std::string>
2975Sema::findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond) {
2976 Cond = lookThroughRangesV3Condition(PP, Cond);
2977
2978 // Separate out all of the terms in a conjunction.
2979 SmallVector<Expr *, 4> Terms;
2980 collectConjunctionTerms(Cond, Terms);
2981
2982 // Determine which term failed.
2983 Expr *FailedCond = nullptr;
2984 for (Expr *Term : Terms) {
2985 Expr *TermAsWritten = Term->IgnoreParenImpCasts();
2986
2987 // Literals are uninteresting.
2988 if (isa<CXXBoolLiteralExpr>(TermAsWritten) ||
2989 isa<IntegerLiteral>(TermAsWritten))
2990 continue;
2991
2992 // The initialization of the parameter from the argument is
2993 // a constant-evaluated context.
2994 EnterExpressionEvaluationContext ConstantEvaluated(
2995 *this, Sema::ExpressionEvaluationContext::ConstantEvaluated);
2996
2997 bool Succeeded;
2998 if (Term->EvaluateAsBooleanCondition(Succeeded, Context) &&
2999 !Succeeded) {
3000 FailedCond = TermAsWritten;
3001 break;
3002 }
3003 }
3004
3005 if (!FailedCond) {
3006 if (!AllowTopLevelCond)
3007 return { nullptr, "" };
3008
3009 FailedCond = Cond->IgnoreParenImpCasts();
3010 }
3011
3012 std::string Description;
3013 {
3014 llvm::raw_string_ostream Out(Description);
3015 FailedCond->printPretty(Out, nullptr, getPrintingPolicy());
3016 }
3017 return { FailedCond, Description };
3018}
3019
3020QualType Sema::CheckTemplateIdType(TemplateName Name,
3021 SourceLocation TemplateLoc,
3022 TemplateArgumentListInfo &TemplateArgs) {
3023 DependentTemplateName *DTN
3024 = Name.getUnderlying().getAsDependentTemplateName();
3025 if (DTN && DTN->isIdentifier())
3026 // When building a template-id where the template-name is dependent,
3027 // assume the template is a type template. Either our assumption is
3028 // correct, or the code is ill-formed and will be diagnosed when the
3029 // dependent name is substituted.
3030 return Context.getDependentTemplateSpecializationType(ETK_None,
3031 DTN->getQualifier(),
3032 DTN->getIdentifier(),
3033 TemplateArgs);
3034
3035 TemplateDecl *Template = Name.getAsTemplateDecl();
3036 if (!Template || isa<FunctionTemplateDecl>(Template) ||
3037 isa<VarTemplateDecl>(Template)) {
3038 // We might have a substituted template template parameter pack. If so,
3039 // build a template specialization type for it.
3040 if (Name.getAsSubstTemplateTemplateParmPack())
3041 return Context.getTemplateSpecializationType(Name, TemplateArgs);
3042
3043 Diag(TemplateLoc, diag::err_template_id_not_a_type)
3044 << Name;
3045 NoteAllFoundTemplates(Name);
3046 return QualType();
3047 }
3048
3049 // Check that the template argument list is well-formed for this
3050 // template.
3051 SmallVector<TemplateArgument, 4> Converted;
3052 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
3053 false, Converted))
3054 return QualType();
3055
3056 QualType CanonType;
3057
3058 bool InstantiationDependent = false;
3059 if (TypeAliasTemplateDecl *AliasTemplate =
3060 dyn_cast<TypeAliasTemplateDecl>(Template)) {
3061 // Find the canonical type for this type alias template specialization.
3062 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
3063 if (Pattern->isInvalidDecl())
3064 return QualType();
3065
3066 TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack,
3067 Converted);
3068
3069 // Only substitute for the innermost template argument list.
3070 MultiLevelTemplateArgumentList TemplateArgLists;
3071 TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs);
3072 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
3073 for (unsigned I = 0; I < Depth; ++I)
3074 TemplateArgLists.addOuterTemplateArguments(None);
3075
3076 LocalInstantiationScope Scope(*this);
3077 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
3078 if (Inst.isInvalid())
3079 return QualType();
3080
3081 CanonType = SubstType(Pattern->getUnderlyingType(),
3082 TemplateArgLists, AliasTemplate->getLocation(),
3083 AliasTemplate->getDeclName());
3084 if (CanonType.isNull()) {
3085 // If this was enable_if and we failed to find the nested type
3086 // within enable_if in a SFINAE context, dig out the specific
3087 // enable_if condition that failed and present that instead.
3088 if (isEnableIfAliasTemplate(AliasTemplate)) {
3089 if (auto DeductionInfo = isSFINAEContext()) {
3090 if (*DeductionInfo &&
3091 (*DeductionInfo)->hasSFINAEDiagnostic() &&
3092 (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() ==
3093 diag::err_typename_nested_not_found_enable_if &&
3094 TemplateArgs[0].getArgument().getKind()
3095 == TemplateArgument::Expression) {
3096 Expr *FailedCond;
3097 std::string FailedDescription;
3098 std::tie(FailedCond, FailedDescription) =
3099 findFailedBooleanCondition(
3100 TemplateArgs[0].getSourceExpression(),
3101 /*AllowTopLevelCond=*/true);
3102
3103 // Remove the old SFINAE diagnostic.
3104 PartialDiagnosticAt OldDiag =
3105 {SourceLocation(), PartialDiagnostic::NullDiagnostic()};
3106 (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag);
3107
3108 // Add a new SFINAE diagnostic specifying which condition
3109 // failed.
3110 (*DeductionInfo)->addSFINAEDiagnostic(
3111 OldDiag.first,
3112 PDiag(diag::err_typename_nested_not_found_requirement)
3113 << FailedDescription
3114 << FailedCond->getSourceRange());
3115 }
3116 }
3117 }
3118
3119 return QualType();
3120 }
3121 } else if (Name.isDependent() ||
3122 TemplateSpecializationType::anyDependentTemplateArguments(
3123 TemplateArgs, InstantiationDependent)) {
3124 // This class template specialization is a dependent
3125 // type. Therefore, its canonical type is another class template
3126 // specialization type that contains all of the converted
3127 // arguments in canonical form. This ensures that, e.g., A<T> and
3128 // A<T, T> have identical types when A is declared as:
3129 //
3130 // template<typename T, typename U = T> struct A;
3131 CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted);
3132
3133 // This might work out to be a current instantiation, in which
3134 // case the canonical type needs to be the InjectedClassNameType.
3135 //
3136 // TODO: in theory this could be a simple hashtable lookup; most
3137 // changes to CurContext don't change the set of current
3138 // instantiations.
3139 if (isa<ClassTemplateDecl>(Template)) {
3140 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
3141 // If we get out to a namespace, we're done.
3142 if (Ctx->isFileContext()) break;
3143
3144 // If this isn't a record, keep looking.
3145 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
3146 if (!Record) continue;
3147
3148 // Look for one of the two cases with InjectedClassNameTypes
3149 // and check whether it's the same template.
3150 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
3151 !Record->getDescribedClassTemplate())
3152 continue;
3153
3154 // Fetch the injected class name type and check whether its
3155 // injected type is equal to the type we just built.
3156 QualType ICNT = Context.getTypeDeclType(Record);
3157 QualType Injected = cast<InjectedClassNameType>(ICNT)
3158 ->getInjectedSpecializationType();
3159
3160 if (CanonType != Injected->getCanonicalTypeInternal())
3161 continue;
3162
3163 // If so, the canonical type of this TST is the injected
3164 // class name type of the record we just found.
3165 assert(ICNT.isCanonical())(static_cast <bool> (ICNT.isCanonical()) ? void (0) : __assert_fail
("ICNT.isCanonical()", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3165, __extension__ __PRETTY_FUNCTION__))
;
3166 CanonType = ICNT;
3167 break;
3168 }
3169 }
3170 } else if (ClassTemplateDecl *ClassTemplate
3171 = dyn_cast<ClassTemplateDecl>(Template)) {
3172 // Find the class template specialization declaration that
3173 // corresponds to these arguments.
3174 void *InsertPos = nullptr;
3175 ClassTemplateSpecializationDecl *Decl
3176 = ClassTemplate->findSpecialization(Converted, InsertPos);
3177 if (!Decl) {
3178 // This is the first time we have referenced this class template
3179 // specialization. Create the canonical declaration and add it to
3180 // the set of specializations.
3181 Decl = ClassTemplateSpecializationDecl::Create(Context,
3182 ClassTemplate->getTemplatedDecl()->getTagKind(),
3183 ClassTemplate->getDeclContext(),
3184 ClassTemplate->getTemplatedDecl()->getLocStart(),
3185 ClassTemplate->getLocation(),
3186 ClassTemplate,
3187 Converted, nullptr);
3188 ClassTemplate->AddSpecialization(Decl, InsertPos);
3189 if (ClassTemplate->isOutOfLine())
3190 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
3191 }
3192
3193 if (Decl->getSpecializationKind() == TSK_Undeclared) {
3194 MultiLevelTemplateArgumentList TemplateArgLists;
3195 TemplateArgLists.addOuterTemplateArguments(Converted);
3196 InstantiateAttrsForDecl(TemplateArgLists, ClassTemplate->getTemplatedDecl(),
3197 Decl);
3198 }
3199
3200 // Diagnose uses of this specialization.
3201 (void)DiagnoseUseOfDecl(Decl, TemplateLoc);
3202
3203 CanonType = Context.getTypeDeclType(Decl);
3204 assert(isa<RecordType>(CanonType) &&(static_cast <bool> (isa<RecordType>(CanonType) &&
"type of non-dependent specialization is not a RecordType") ?
void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3205, __extension__ __PRETTY_FUNCTION__))
3205 "type of non-dependent specialization is not a RecordType")(static_cast <bool> (isa<RecordType>(CanonType) &&
"type of non-dependent specialization is not a RecordType") ?
void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3205, __extension__ __PRETTY_FUNCTION__))
;
3206 } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) {
3207 CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc,
3208 TemplateArgs);
3209 }
3210
3211 // Build the fully-sugared type for this class template
3212 // specialization, which refers back to the class template
3213 // specialization we created or found.
3214 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
3215}
3216
3217TypeResult
3218Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
3219 TemplateTy TemplateD, IdentifierInfo *TemplateII,
3220 SourceLocation TemplateIILoc,
3221 SourceLocation LAngleLoc,
3222 ASTTemplateArgsPtr TemplateArgsIn,
3223 SourceLocation RAngleLoc,
3224 bool IsCtorOrDtorName, bool IsClassName) {
3225 if (SS.isInvalid())
3226 return true;
3227
3228 if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) {
3229 DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false);
3230
3231 // C++ [temp.res]p3:
3232 // A qualified-id that refers to a type and in which the
3233 // nested-name-specifier depends on a template-parameter (14.6.2)
3234 // shall be prefixed by the keyword typename to indicate that the
3235 // qualified-id denotes a type, forming an
3236 // elaborated-type-specifier (7.1.5.3).
3237 if (!LookupCtx && isDependentScopeSpecifier(SS)) {
3238 Diag(SS.getBeginLoc(), diag::err_typename_missing_template)
3239 << SS.getScopeRep() << TemplateII->getName();
3240 // Recover as if 'typename' were specified.
3241 // FIXME: This is not quite correct recovery as we don't transform SS
3242 // into the corresponding dependent form (and we don't diagnose missing
3243 // 'template' keywords within SS as a result).
3244 return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc,
3245 TemplateD, TemplateII, TemplateIILoc, LAngleLoc,
3246 TemplateArgsIn, RAngleLoc);
3247 }
3248
3249 // Per C++ [class.qual]p2, if the template-id was an injected-class-name,
3250 // it's not actually allowed to be used as a type in most cases. Because
3251 // we annotate it before we know whether it's valid, we have to check for
3252 // this case here.
3253 auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx);
3254 if (LookupRD && LookupRD->getIdentifier() == TemplateII) {
3255 Diag(TemplateIILoc,
3256 TemplateKWLoc.isInvalid()
3257 ? diag::err_out_of_line_qualified_id_type_names_constructor
3258 : diag::ext_out_of_line_qualified_id_type_names_constructor)
3259 << TemplateII << 0 /*injected-class-name used as template name*/
3260 << 1 /*if any keyword was present, it was 'template'*/;
3261 }
3262 }
3263
3264 TemplateName Template = TemplateD.get();
3265
3266 // Translate the parser's template argument list in our AST format.
3267 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3268 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3269
3270 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3271 QualType T
3272 = Context.getDependentTemplateSpecializationType(ETK_None,
3273 DTN->getQualifier(),
3274 DTN->getIdentifier(),
3275 TemplateArgs);
3276 // Build type-source information.
3277 TypeLocBuilder TLB;
3278 DependentTemplateSpecializationTypeLoc SpecTL
3279 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3280 SpecTL.setElaboratedKeywordLoc(SourceLocation());
3281 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3282 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3283 SpecTL.setTemplateNameLoc(TemplateIILoc);
3284 SpecTL.setLAngleLoc(LAngleLoc);
3285 SpecTL.setRAngleLoc(RAngleLoc);
3286 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3287 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3288 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3289 }
3290
3291 QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs);
3292 if (Result.isNull())
3293 return true;
3294
3295 // Build type-source information.
3296 TypeLocBuilder TLB;
3297 TemplateSpecializationTypeLoc SpecTL
3298 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3299 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3300 SpecTL.setTemplateNameLoc(TemplateIILoc);
3301 SpecTL.setLAngleLoc(LAngleLoc);
3302 SpecTL.setRAngleLoc(RAngleLoc);
3303 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3304 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3305
3306 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
3307 // constructor or destructor name (in such a case, the scope specifier
3308 // will be attached to the enclosing Decl or Expr node).
3309 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
3310 // Create an elaborated-type-specifier containing the nested-name-specifier.
3311 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
3312 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3313 ElabTL.setElaboratedKeywordLoc(SourceLocation());
3314 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3315 }
3316
3317 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3318}
3319
3320TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
3321 TypeSpecifierType TagSpec,
3322 SourceLocation TagLoc,
3323 CXXScopeSpec &SS,
3324 SourceLocation TemplateKWLoc,
3325 TemplateTy TemplateD,
3326 SourceLocation TemplateLoc,
3327 SourceLocation LAngleLoc,
3328 ASTTemplateArgsPtr TemplateArgsIn,
3329 SourceLocation RAngleLoc) {
3330 TemplateName Template = TemplateD.get();
3331
3332 // Translate the parser's template argument list in our AST format.
3333 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3334 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3335
3336 // Determine the tag kind
3337 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
3338 ElaboratedTypeKeyword Keyword
3339 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
3340
3341 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3342 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
3343 DTN->getQualifier(),
3344 DTN->getIdentifier(),
3345 TemplateArgs);
3346
3347 // Build type-source information.
3348 TypeLocBuilder TLB;
3349 DependentTemplateSpecializationTypeLoc SpecTL
3350 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3351 SpecTL.setElaboratedKeywordLoc(TagLoc);
3352 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3353 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3354 SpecTL.setTemplateNameLoc(TemplateLoc);
3355 SpecTL.setLAngleLoc(LAngleLoc);
3356 SpecTL.setRAngleLoc(RAngleLoc);
3357 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3358 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3359 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3360 }
3361
3362 if (TypeAliasTemplateDecl *TAT =
3363 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
3364 // C++0x [dcl.type.elab]p2:
3365 // If the identifier resolves to a typedef-name or the simple-template-id
3366 // resolves to an alias template specialization, the
3367 // elaborated-type-specifier is ill-formed.
3368 Diag(TemplateLoc, diag::err_tag_reference_non_tag)
3369 << TAT << NTK_TypeAliasTemplate << TagKind;
3370 Diag(TAT->getLocation(), diag::note_declared_at);
3371 }
3372
3373 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
3374 if (Result.isNull())
3375 return TypeResult(true);
3376
3377 // Check the tag kind
3378 if (const RecordType *RT = Result->getAs<RecordType>()) {
3379 RecordDecl *D = RT->getDecl();
3380
3381 IdentifierInfo *Id = D->getIdentifier();
3382 assert(Id && "templated class must have an identifier")(static_cast <bool> (Id && "templated class must have an identifier"
) ? void (0) : __assert_fail ("Id && \"templated class must have an identifier\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3382, __extension__ __PRETTY_FUNCTION__))
;
3383
3384 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
3385 TagLoc, Id)) {
3386 Diag(TagLoc, diag::err_use_with_wrong_tag)
3387 << Result
3388 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
3389 Diag(D->getLocation(), diag::note_previous_use);
3390 }
3391 }
3392
3393 // Provide source-location information for the template specialization.
3394 TypeLocBuilder TLB;
3395 TemplateSpecializationTypeLoc SpecTL
3396 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3397 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3398 SpecTL.setTemplateNameLoc(TemplateLoc);
3399 SpecTL.setLAngleLoc(LAngleLoc);
3400 SpecTL.setRAngleLoc(RAngleLoc);
3401 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3402 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3403
3404 // Construct an elaborated type containing the nested-name-specifier (if any)
3405 // and tag keyword.
3406 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
3407 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3408 ElabTL.setElaboratedKeywordLoc(TagLoc);
3409 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3410 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3411}
3412
3413static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized,
3414 NamedDecl *PrevDecl,
3415 SourceLocation Loc,
3416 bool IsPartialSpecialization);
3417
3418static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D);
3419
3420static bool isTemplateArgumentTemplateParameter(
3421 const TemplateArgument &Arg, unsigned Depth, unsigned Index) {
3422 switch (Arg.getKind()) {
3423 case TemplateArgument::Null:
3424 case TemplateArgument::NullPtr:
3425 case TemplateArgument::Integral:
3426 case TemplateArgument::Declaration:
3427 case TemplateArgument::Pack:
3428 case TemplateArgument::TemplateExpansion:
3429 return false;
3430
3431 case TemplateArgument::Type: {
3432 QualType Type = Arg.getAsType();
3433 const TemplateTypeParmType *TPT =
3434 Arg.getAsType()->getAs<TemplateTypeParmType>();
3435 return TPT && !Type.hasQualifiers() &&
3436 TPT->getDepth() == Depth && TPT->getIndex() == Index;
3437 }
3438
3439 case TemplateArgument::Expression: {
3440 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr());
3441 if (!DRE || !DRE->getDecl())
3442 return false;
3443 const NonTypeTemplateParmDecl *NTTP =
3444 dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
3445 return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index;
3446 }
3447
3448 case TemplateArgument::Template:
3449 const TemplateTemplateParmDecl *TTP =
3450 dyn_cast_or_null<TemplateTemplateParmDecl>(
3451 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl());
3452 return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index;
3453 }
3454 llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3454)
;
3455}
3456
3457static bool isSameAsPrimaryTemplate(TemplateParameterList *Params,
3458 ArrayRef<TemplateArgument> Args) {
3459 if (Params->size() != Args.size())
3460 return false;
3461
3462 unsigned Depth = Params->getDepth();
3463
3464 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3465 TemplateArgument Arg = Args[I];
3466
3467 // If the parameter is a pack expansion, the argument must be a pack
3468 // whose only element is a pack expansion.
3469 if (Params->getParam(I)->isParameterPack()) {
3470 if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 ||
3471 !Arg.pack_begin()->isPackExpansion())
3472 return false;
3473 Arg = Arg.pack_begin()->getPackExpansionPattern();
3474 }
3475
3476 if (!isTemplateArgumentTemplateParameter(Arg, Depth, I))
3477 return false;
3478 }
3479
3480 return true;
3481}
3482
3483/// Convert the parser's template argument list representation into our form.
3484static TemplateArgumentListInfo
3485makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) {
3486 TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc,
3487 TemplateId.RAngleLoc);
3488 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(),
3489 TemplateId.NumArgs);
3490 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
3491 return TemplateArgs;
3492}
3493
3494template<typename PartialSpecDecl>
3495static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) {
3496 if (Partial->getDeclContext()->isDependentContext())
3497 return;
3498
3499 // FIXME: Get the TDK from deduction in order to provide better diagnostics
3500 // for non-substitution-failure issues?
3501 TemplateDeductionInfo Info(Partial->getLocation());
3502 if (S.isMoreSpecializedThanPrimary(Partial, Info))
3503 return;
3504
3505 auto *Template = Partial->getSpecializedTemplate();
3506 S.Diag(Partial->getLocation(),
3507 diag::ext_partial_spec_not_more_specialized_than_primary)
3508 << isa<VarTemplateDecl>(Template);
3509
3510 if (Info.hasSFINAEDiagnostic()) {
3511 PartialDiagnosticAt Diag = {SourceLocation(),
3512 PartialDiagnostic::NullDiagnostic()};
3513 Info.takeSFINAEDiagnostic(Diag);
3514 SmallString<128> SFINAEArgString;
3515 Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString);
3516 S.Diag(Diag.first,
3517 diag::note_partial_spec_not_more_specialized_than_primary)
3518 << SFINAEArgString;
3519 }
3520
3521 S.Diag(Template->getLocation(), diag::note_template_decl_here);
3522}
3523
3524static void
3525noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams,
3526 const llvm::SmallBitVector &DeducibleParams) {
3527 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
3528 if (!DeducibleParams[I]) {
3529 NamedDecl *Param = TemplateParams->getParam(I);
3530 if (Param->getDeclName())
3531 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3532 << Param->getDeclName();
3533 else
3534 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3535 << "(anonymous)";
3536 }
3537 }
3538}
3539
3540
3541template<typename PartialSpecDecl>
3542static void checkTemplatePartialSpecialization(Sema &S,
3543 PartialSpecDecl *Partial) {
3544 // C++1z [temp.class.spec]p8: (DR1495)
3545 // - The specialization shall be more specialized than the primary
3546 // template (14.5.5.2).
3547 checkMoreSpecializedThanPrimary(S, Partial);
3548
3549 // C++ [temp.class.spec]p8: (DR1315)
3550 // - Each template-parameter shall appear at least once in the
3551 // template-id outside a non-deduced context.
3552 // C++1z [temp.class.spec.match]p3 (P0127R2)
3553 // If the template arguments of a partial specialization cannot be
3554 // deduced because of the structure of its template-parameter-list
3555 // and the template-id, the program is ill-formed.
3556 auto *TemplateParams = Partial->getTemplateParameters();
3557 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3558 S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
3559 TemplateParams->getDepth(), DeducibleParams);
3560
3561 if (!DeducibleParams.all()) {
3562 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3563 S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible)
3564 << isa<VarTemplatePartialSpecializationDecl>(Partial)
3565 << (NumNonDeducible > 1)
3566 << SourceRange(Partial->getLocation(),
3567 Partial->getTemplateArgsAsWritten()->RAngleLoc);
3568 noteNonDeducibleParameters(S, TemplateParams, DeducibleParams);
3569 }
3570}
3571
3572void Sema::CheckTemplatePartialSpecialization(
3573 ClassTemplatePartialSpecializationDecl *Partial) {
3574 checkTemplatePartialSpecialization(*this, Partial);
3575}
3576
3577void Sema::CheckTemplatePartialSpecialization(
3578 VarTemplatePartialSpecializationDecl *Partial) {
3579 checkTemplatePartialSpecialization(*this, Partial);
3580}
3581
3582void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) {
3583 // C++1z [temp.param]p11:
3584 // A template parameter of a deduction guide template that does not have a
3585 // default-argument shall be deducible from the parameter-type-list of the
3586 // deduction guide template.
3587 auto *TemplateParams = TD->getTemplateParameters();
3588 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3589 MarkDeducedTemplateParameters(TD, DeducibleParams);
3590 for (unsigned I = 0; I != TemplateParams->size(); ++I) {
3591 // A parameter pack is deducible (to an empty pack).
3592 auto *Param = TemplateParams->getParam(I);
3593 if (Param->isParameterPack() || hasVisibleDefaultArgument(Param))
3594 DeducibleParams[I] = true;
3595 }
3596
3597 if (!DeducibleParams.all()) {
3598 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3599 Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible)
3600 << (NumNonDeducible > 1);
3601 noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams);
3602 }
3603}
3604
3605DeclResult Sema::ActOnVarTemplateSpecialization(
3606 Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc,
3607 TemplateParameterList *TemplateParams, StorageClass SC,
3608 bool IsPartialSpecialization) {
3609 // D must be variable template id.
3610 assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind
::IK_TemplateId && "Variable template specialization is declared with a template it."
) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3611, __extension__ __PRETTY_FUNCTION__))
3611 "Variable template specialization is declared with a template it.")(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind
::IK_TemplateId && "Variable template specialization is declared with a template it."
) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3611, __extension__ __PRETTY_FUNCTION__))
;
3612
3613 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
3614 TemplateArgumentListInfo TemplateArgs =
3615 makeTemplateArgumentListInfo(*this, *TemplateId);
3616 SourceLocation TemplateNameLoc = D.getIdentifierLoc();
3617 SourceLocation LAngleLoc = TemplateId->LAngleLoc;
3618 SourceLocation RAngleLoc = TemplateId->RAngleLoc;
3619
3620 TemplateName Name = TemplateId->Template.get();
3621
3622 // The template-id must name a variable template.
3623 VarTemplateDecl *VarTemplate =
3624 dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl());
3625 if (!VarTemplate) {
3626 NamedDecl *FnTemplate;
3627 if (auto *OTS = Name.getAsOverloadedTemplate())
3628 FnTemplate = *OTS->begin();
3629 else
3630 FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl());
3631 if (FnTemplate)
3632 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method)
3633 << FnTemplate->getDeclName();
3634 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template)
3635 << IsPartialSpecialization;
3636 }
3637
3638 // Check for unexpanded parameter packs in any of the template arguments.
3639 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
3640 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
3641 UPPC_PartialSpecialization))
3642 return true;
3643
3644 // Check that the template argument list is well-formed for this
3645 // template.
3646 SmallVector<TemplateArgument, 4> Converted;
3647 if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs,
3648 false, Converted))
3649 return true;
3650
3651 // Find the variable template (partial) specialization declaration that
3652 // corresponds to these arguments.
3653 if (IsPartialSpecialization) {
3654 if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate,
3655 TemplateArgs.size(), Converted))
3656 return true;
3657
3658 // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we
3659 // also do them during instantiation.
3660 bool InstantiationDependent;
3661 if (!Name.isDependent() &&
3662 !TemplateSpecializationType::anyDependentTemplateArguments(
3663 TemplateArgs.arguments(),
3664 InstantiationDependent)) {
3665 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
3666 << VarTemplate->getDeclName();
3667 IsPartialSpecialization = false;
3668 }
3669
3670 if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(),
3671 Converted)) {
3672 // C++ [temp.class.spec]p9b3:
3673 //
3674 // -- The argument list of the specialization shall not be identical
3675 // to the implicit argument list of the primary template.
3676 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
3677 << /*variable template*/ 1
3678 << /*is definition*/(SC != SC_Extern && !CurContext->isRecord())
3679 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
3680 // FIXME: Recover from this by treating the declaration as a redeclaration
3681 // of the primary template.
3682 return true;
3683 }
3684 }
3685
3686 void *InsertPos = nullptr;
3687 VarTemplateSpecializationDecl *PrevDecl = nullptr;
3688
3689 if (IsPartialSpecialization)
3690 // FIXME: Template parameter list matters too
3691 PrevDecl = VarTemplate->findPartialSpecialization(Converted, InsertPos);
3692 else
3693 PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos);
3694
3695 VarTemplateSpecializationDecl *Specialization = nullptr;
3696
3697 // Check whether we can declare a variable template specialization in
3698 // the current scope.
3699 if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl,
3700 TemplateNameLoc,
3701 IsPartialSpecialization))
3702 return true;
3703
3704 if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) {
3705 // Since the only prior variable template specialization with these
3706 // arguments was referenced but not declared, reuse that
3707 // declaration node as our own, updating its source location and
3708 // the list of outer template parameters to reflect our new declaration.
3709 Specialization = PrevDecl;
3710 Specialization->setLocation(TemplateNameLoc);
3711 PrevDecl = nullptr;
3712 } else if (IsPartialSpecialization) {
3713 // Create a new class template partial specialization declaration node.
3714 VarTemplatePartialSpecializationDecl *PrevPartial =
3715 cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl);
3716 VarTemplatePartialSpecializationDecl *Partial =
3717 VarTemplatePartialSpecializationDecl::Create(
3718 Context, VarTemplate->getDeclContext(), TemplateKWLoc,
3719 TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC,
3720 Converted, TemplateArgs);
3721
3722 if (!PrevPartial)
3723 VarTemplate->AddPartialSpecialization(Partial, InsertPos);
3724 Specialization = Partial;
3725
3726 // If we are providing an explicit specialization of a member variable
3727 // template specialization, make a note of that.
3728 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
3729 PrevPartial->setMemberSpecialization();
3730
3731 CheckTemplatePartialSpecialization(Partial);
3732 } else {
3733 // Create a new class template specialization declaration node for
3734 // this explicit specialization or friend declaration.
3735 Specialization = VarTemplateSpecializationDecl::Create(
3736 Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc,
3737 VarTemplate, DI->getType(), DI, SC, Converted);
3738 Specialization->setTemplateArgsInfo(TemplateArgs);
3739
3740 if (!PrevDecl)
3741 VarTemplate->AddSpecialization(Specialization, InsertPos);
3742 }
3743
3744 // C++ [temp.expl.spec]p6:
3745 // If a template, a member template or the member of a class template is
3746 // explicitly specialized then that specialization shall be declared
3747 // before the first use of that specialization that would cause an implicit
3748 // instantiation to take place, in every translation unit in which such a
3749 // use occurs; no diagnostic is required.
3750 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
3751 bool Okay = false;
3752 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
3753 // Is there any previous explicit specialization declaration?
3754 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
3755 Okay = true;
3756 break;
3757 }
3758 }
3759
3760 if (!Okay) {
3761 SourceRange Range(TemplateNameLoc, RAngleLoc);
3762 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
3763 << Name << Range;
3764
3765 Diag(PrevDecl->getPointOfInstantiation(),
3766 diag::note_instantiation_required_here)
3767 << (PrevDecl->getTemplateSpecializationKind() !=
3768 TSK_ImplicitInstantiation);
3769 return true;
3770 }
3771 }
3772
3773 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
3774 Specialization->setLexicalDeclContext(CurContext);
3775
3776 // Add the specialization into its lexical context, so that it can
3777 // be seen when iterating through the list of declarations in that
3778 // context. However, specializations are not found by name lookup.
3779 CurContext->addDecl(Specialization);
3780
3781 // Note that this is an explicit specialization.
3782 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
3783
3784 if (PrevDecl) {
3785 // Check that this isn't a redefinition of this specialization,
3786 // merging with previous declarations.
3787 LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName,
3788 forRedeclarationInCurContext());
3789 PrevSpec.addDecl(PrevDecl);
3790 D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec));
3791 } else if (Specialization->isStaticDataMember() &&
3792 Specialization->isOutOfLine()) {
3793 Specialization->setAccess(VarTemplate->getAccess());
3794 }
3795
3796 // Link instantiations of static data members back to the template from
3797 // which they were instantiated.
3798 if (Specialization->isStaticDataMember())
3799 Specialization->setInstantiationOfStaticDataMember(
3800 VarTemplate->getTemplatedDecl(),
3801 Specialization->getSpecializationKind());
3802
3803 return Specialization;
3804}
3805
3806namespace {
3807/// \brief A partial specialization whose template arguments have matched
3808/// a given template-id.
3809struct PartialSpecMatchResult {
3810 VarTemplatePartialSpecializationDecl *Partial;
3811 TemplateArgumentList *Args;
3812};
3813} // end anonymous namespace
3814
3815DeclResult
3816Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
3817 SourceLocation TemplateNameLoc,
3818 const TemplateArgumentListInfo &TemplateArgs) {
3819 assert(Template && "A variable template id without template?")(static_cast <bool> (Template && "A variable template id without template?"
) ? void (0) : __assert_fail ("Template && \"A variable template id without template?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3819, __extension__ __PRETTY_FUNCTION__))
;
3820
3821 // Check that the template argument list is well-formed for this template.
3822 SmallVector<TemplateArgument, 4> Converted;
3823 if (CheckTemplateArgumentList(
24
Taking false branch
3824 Template, TemplateNameLoc,
3825 const_cast<TemplateArgumentListInfo &>(TemplateArgs), false,
3826 Converted))
3827 return true;
3828
3829 // Find the variable template specialization declaration that
3830 // corresponds to these arguments.
3831 void *InsertPos = nullptr;
3832 if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
25
Assuming 'Spec' is null
26
Taking false branch
3833 Converted, InsertPos)) {
3834 checkSpecializationVisibility(TemplateNameLoc, Spec);
3835 // If we already have a variable template specialization, return it.
3836 return Spec;
3837 }
3838
3839 // This is the first time we have referenced this variable template
3840 // specialization. Create the canonical declaration and add it to
3841 // the set of specializations, based on the closest partial specialization
3842 // that it represents. That is,
3843 VarDecl *InstantiationPattern = Template->getTemplatedDecl();
3844 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
3845 Converted);
3846 TemplateArgumentList *InstantiationArgs = &TemplateArgList;
3847 bool AmbiguousPartialSpec = false;
3848 typedef PartialSpecMatchResult MatchResult;
3849 SmallVector<MatchResult, 4> Matched;
3850 SourceLocation PointOfInstantiation = TemplateNameLoc;
3851 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation,
3852 /*ForTakingAddress=*/false);
3853
3854 // 1. Attempt to find the closest partial specialization that this
3855 // specializes, if any.
3856 // If any of the template arguments is dependent, then this is probably
3857 // a placeholder for an incomplete declarative context; which must be
3858 // complete by instantiation time. Thus, do not search through the partial
3859 // specializations yet.
3860 // TODO: Unify with InstantiateClassTemplateSpecialization()?
3861 // Perhaps better after unification of DeduceTemplateArguments() and
3862 // getMoreSpecializedPartialSpecialization().
3863 bool InstantiationDependent = false;
3864 if (!TemplateSpecializationType::anyDependentTemplateArguments(
27
Assuming the condition is false
28
Taking false branch
3865 TemplateArgs, InstantiationDependent)) {
3866
3867 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
3868 Template->getPartialSpecializations(PartialSpecs);
3869
3870 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
3871 VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
3872 TemplateDeductionInfo Info(FailedCandidates.getLocation());
3873
3874 if (TemplateDeductionResult Result =
3875 DeduceTemplateArguments(Partial, TemplateArgList, Info)) {
3876 // Store the failed-deduction information for use in diagnostics, later.
3877 // TODO: Actually use the failed-deduction info?
3878 FailedCandidates.addCandidate().set(
3879 DeclAccessPair::make(Template, AS_public), Partial,
3880 MakeDeductionFailureInfo(Context, Result, Info));
3881 (void)Result;
3882 } else {
3883 Matched.push_back(PartialSpecMatchResult());
3884 Matched.back().Partial = Partial;
3885 Matched.back().Args = Info.take();
3886 }
3887 }
3888
3889 if (Matched.size() >= 1) {
3890 SmallVector<MatchResult, 4>::iterator Best = Matched.begin();
3891 if (Matched.size() == 1) {
3892 // -- If exactly one matching specialization is found, the
3893 // instantiation is generated from that specialization.
3894 // We don't need to do anything for this.
3895 } else {
3896 // -- If more than one matching specialization is found, the
3897 // partial order rules (14.5.4.2) are used to determine
3898 // whether one of the specializations is more specialized
3899 // than the others. If none of the specializations is more
3900 // specialized than all of the other matching
3901 // specializations, then the use of the variable template is
3902 // ambiguous and the program is ill-formed.
3903 for (SmallVector<MatchResult, 4>::iterator P = Best + 1,
3904 PEnd = Matched.end();
3905 P != PEnd; ++P) {
3906 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
3907 PointOfInstantiation) ==
3908 P->Partial)
3909 Best = P;
3910 }
3911
3912 // Determine if the best partial specialization is more specialized than
3913 // the others.
3914 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
3915 PEnd = Matched.end();
3916 P != PEnd; ++P) {
3917 if (P != Best && getMoreSpecializedPartialSpecialization(
3918 P->Partial, Best->Partial,
3919 PointOfInstantiation) != Best->Partial) {
3920 AmbiguousPartialSpec = true;
3921 break;
3922 }
3923 }
3924 }
3925
3926 // Instantiate using the best variable template partial specialization.
3927 InstantiationPattern = Best->Partial;
3928 InstantiationArgs = Best->Args;
3929 } else {
3930 // -- If no match is found, the instantiation is generated
3931 // from the primary template.
3932 // InstantiationPattern = Template->getTemplatedDecl();
3933 }
3934 }
3935
3936 // 2. Create the canonical declaration.
3937 // Note that we do not instantiate a definition until we see an odr-use
3938 // in DoMarkVarDeclReferenced().
3939 // FIXME: LateAttrs et al.?
3940 VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
3941 Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
3942 Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/);
3943 if (!Decl)
29
Assuming 'Decl' is non-null
30
Taking false branch
3944 return true;
3945
3946 if (AmbiguousPartialSpec) {
31
Taking false branch
3947 // Partial ordering did not produce a clear winner. Complain.
3948 Decl->setInvalidDecl();
3949 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
3950 << Decl;
3951
3952 // Print the matching partial specializations.
3953 for (MatchResult P : Matched)
3954 Diag(P.Partial->getLocation(), diag::note_partial_spec_match)
3955 << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(),
3956 *P.Args);
3957 return true;
3958 }
3959
3960 if (VarTemplatePartialSpecializationDecl *D =
32
Assuming 'D' is non-null
33
Taking true branch
3961 dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
3962 Decl->setInstantiationOf(D, InstantiationArgs);
34
Calling 'VarTemplateSpecializationDecl::setInstantiationOf'
3963
3964 checkSpecializationVisibility(TemplateNameLoc, Decl);
3965
3966 assert(Decl && "No variable template specialization?")(static_cast <bool> (Decl && "No variable template specialization?"
) ? void (0) : __assert_fail ("Decl && \"No variable template specialization?\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3966, __extension__ __PRETTY_FUNCTION__))
;
3967 return Decl;
3968}
3969
3970ExprResult
3971Sema::CheckVarTemplateId(const CXXScopeSpec &SS,
3972 const DeclarationNameInfo &NameInfo,
3973 VarTemplateDecl *Template, SourceLocation TemplateLoc,
3974 const TemplateArgumentListInfo *TemplateArgs) {
3975
3976 DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(),
3977 *TemplateArgs);
3978 if (Decl.isInvalid())
3979 return ExprError();
3980
3981 VarDecl *Var = cast<VarDecl>(Decl.get());
3982 if (!Var->getTemplateSpecializationKind())
3983 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
3984 NameInfo.getLoc());
3985
3986 // Build an ordinary singleton decl ref.
3987 return BuildDeclarationNameExpr(SS, NameInfo, Var,
3988 /*FoundD=*/nullptr, TemplateArgs);
3989}
3990
3991ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
3992 SourceLocation TemplateKWLoc,
3993 LookupResult &R,
3994 bool RequiresADL,
3995 const TemplateArgumentListInfo *TemplateArgs) {
3996 // FIXME: Can we do any checking at this point? I guess we could check the
3997 // template arguments that we have against the template name, if the template
3998 // name refers to a single template. That's not a terribly common case,
3999 // though.
4000 // foo<int> could identify a single function unambiguously
4001 // This approach does NOT work, since f<int>(1);
4002 // gets resolved prior to resorting to overload resolution
4003 // i.e., template<class T> void f(double);
4004 // vs template<class T, class U> void f(U);
4005
4006 // These should be filtered out by our callers.
4007 assert(!R.empty() && "empty lookup results when building templateid")(static_cast <bool> (!R.empty() && "empty lookup results when building templateid"
) ? void (0) : __assert_fail ("!R.empty() && \"empty lookup results when building templateid\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4007, __extension__ __PRETTY_FUNCTION__))
;
4008 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")(static_cast <bool> (!R.isAmbiguous() && "ambiguous lookup when building templateid"
) ? void (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4008, __extension__ __PRETTY_FUNCTION__))
;
4009
4010 // In C++1y, check variable template ids.
4011 bool InstantiationDependent;
4012 if (R.getAsSingle<VarTemplateDecl>() &&
4013 !TemplateSpecializationType::anyDependentTemplateArguments(
4014 *TemplateArgs, InstantiationDependent)) {
4015 return CheckVarTemplateId(SS, R.getLookupNameInfo(),
4016 R.getAsSingle<VarTemplateDecl>(),
4017 TemplateKWLoc, TemplateArgs);
4018 }
4019
4020 // We don't want lookup warnings at this point.
4021 R.suppressDiagnostics();
4022
4023 UnresolvedLookupExpr *ULE
4024 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
4025 SS.getWithLocInContext(Context),
4026 TemplateKWLoc,
4027 R.getLookupNameInfo(),
4028 RequiresADL, TemplateArgs,
4029 R.begin(), R.end());
4030
4031 return ULE;
4032}
4033
4034// We actually only call this from template instantiation.
4035ExprResult
4036Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
4037 SourceLocation TemplateKWLoc,
4038 const DeclarationNameInfo &NameInfo,
4039 const TemplateArgumentListInfo *TemplateArgs) {
4040
4041 assert(TemplateArgs || TemplateKWLoc.isValid())(static_cast <bool> (TemplateArgs || TemplateKWLoc.isValid
()) ? void (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4041, __extension__ __PRETTY_FUNCTION__))
;
4042 DeclContext *DC;
4043 if (!(DC = computeDeclContext(SS, false)) ||
4044 DC->isDependentContext() ||
4045 RequireCompleteDeclContext(SS, DC))
4046 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
4047
4048 bool MemberOfUnknownSpecialization;
4049 LookupResult R(*this, NameInfo, LookupOrdinaryName);
4050 LookupTemplateName(R, (Scope*)nullptr, SS, QualType(), /*Entering*/ false,
4051 MemberOfUnknownSpecialization);
4052
4053 if (R.isAmbiguous())
4054 return ExprError();
4055
4056 if (R.empty()) {
4057 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template)
4058 << NameInfo.getName() << SS.getRange();
4059 return ExprError();
4060 }
4061
4062 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
4063 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
4064 << SS.getScopeRep()
4065 << NameInfo.getName().getAsString() << SS.getRange();
4066 Diag(Temp->getLocation(), diag::note_referenced_class_template);
4067 return ExprError();
4068 }
4069
4070 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
4071}
4072
4073/// \brief Form a dependent template name.
4074///
4075/// This action forms a dependent template name given the template
4076/// name and its (presumably dependent) scope specifier. For
4077/// example, given "MetaFun::template apply", the scope specifier \p
4078/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
4079/// of the "template" keyword, and "apply" is the \p Name.
4080TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
4081 CXXScopeSpec &SS,
4082 SourceLocation TemplateKWLoc,
4083 UnqualifiedId &Name,
4084 ParsedType ObjectType,
4085 bool EnteringContext,
4086 TemplateTy &Result,
4087 bool AllowInjectedClassName) {
4088 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
4089 Diag(TemplateKWLoc,
4090 getLangOpts().CPlusPlus11 ?
4091 diag::warn_cxx98_compat_template_outside_of_template :
4092 diag::ext_template_outside_of_template)
4093 << FixItHint::CreateRemoval(TemplateKWLoc);
4094
4095 DeclContext *LookupCtx = nullptr;
4096 if (SS.isSet())
4097 LookupCtx = computeDeclContext(SS, EnteringContext);
4098 if (!LookupCtx && ObjectType)
4099 LookupCtx = computeDeclContext(ObjectType.get());
4100 if (LookupCtx) {
4101 // C++0x [temp.names]p5:
4102 // If a name prefixed by the keyword template is not the name of
4103 // a template, the program is ill-formed. [Note: the keyword
4104 // template may not be applied to non-template members of class
4105 // templates. -end note ] [ Note: as is the case with the
4106 // typename prefix, the template prefix is allowed in cases
4107 // where it is not strictly necessary; i.e., when the
4108 // nested-name-specifier or the expression on the left of the ->
4109 // or . is not dependent on a template-parameter, or the use
4110 // does not appear in the scope of a template. -end note]
4111 //
4112 // Note: C++03 was more strict here, because it banned the use of
4113 // the "template" keyword prior to a template-name that was not a
4114 // dependent name. C++ DR468 relaxed this requirement (the
4115 // "template" keyword is now permitted). We follow the C++0x
4116 // rules, even in C++03 mode with a warning, retroactively applying the DR.
4117 bool MemberOfUnknownSpecialization;
4118 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
4119 ObjectType, EnteringContext, Result,
4120 MemberOfUnknownSpecialization);
4121 if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
4122 isa<CXXRecordDecl>(LookupCtx) &&
4123 (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
4124 cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) {
4125 // This is a dependent template. Handle it below.
4126 } else if (TNK == TNK_Non_template) {
4127 Diag(Name.getLocStart(),
4128 diag::err_template_kw_refers_to_non_template)
4129 << GetNameFromUnqualifiedId(Name).getName()
4130 << Name.getSourceRange()
4131 << TemplateKWLoc;
4132 return TNK_Non_template;
4133 } else {
4134 // We found something; return it.
4135 auto *LookupRD = dyn_cast<CXXRecordDecl>(LookupCtx);
4136 if (!AllowInjectedClassName && SS.isSet() && LookupRD &&
4137 Name.getKind() == UnqualifiedIdKind::IK_Identifier &&
4138 Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) {
4139 // C++14 [class.qual]p2:
4140 // In a lookup in which function names are not ignored and the
4141 // nested-name-specifier nominates a class C, if the name specified
4142 // [...] is the injected-class-name of C, [...] the name is instead
4143 // considered to name the constructor
4144 //
4145 // We don't get here if naming the constructor would be valid, so we
4146 // just reject immediately and recover by treating the
4147 // injected-class-name as naming the template.
4148 Diag(Name.getLocStart(),
4149 diag::ext_out_of_line_qualified_id_type_names_constructor)
4150 << Name.Identifier << 0 /*injected-class-name used as template name*/
4151 << 1 /*'template' keyword was used*/;
4152 }
4153 return TNK;
4154 }
4155 }
4156
4157 NestedNameSpecifier *Qualifier = SS.getScopeRep();
4158
4159 switch (Name.getKind()) {
4160 case UnqualifiedIdKind::IK_Identifier:
4161 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4162 Name.Identifier));
4163 return TNK_Dependent_template_name;
4164
4165 case UnqualifiedIdKind::IK_OperatorFunctionId:
4166 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4167 Name.OperatorFunctionId.Operator));
4168 return TNK_Function_template;
4169
4170 case UnqualifiedIdKind::IK_LiteralOperatorId:
4171 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-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4171)
;
4172
4173 default:
4174 break;
4175 }
4176
4177 Diag(Name.getLocStart(),
4178 diag::err_template_kw_refers_to_non_template)
4179 << GetNameFromUnqualifiedId(Name).getName()
4180 << Name.getSourceRange()
4181 << TemplateKWLoc;
4182 return TNK_Non_template;
4183}
4184
4185bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
4186 TemplateArgumentLoc &AL,
4187 SmallVectorImpl<TemplateArgument> &Converted) {
4188 const TemplateArgument &Arg = AL.getArgument();
4189 QualType ArgType;
4190 TypeSourceInfo *TSI = nullptr;
4191
4192 // Check template type parameter.
4193 switch(Arg.getKind()) {
4194 case TemplateArgument::Type:
4195 // C++ [temp.arg.type]p1:
4196 // A template-argument for a template-parameter which is a
4197 // type shall be a type-id.
4198 ArgType = Arg.getAsType();
4199 TSI = AL.getTypeSourceInfo();
4200 break;
4201 case TemplateArgument::Template:
4202 case TemplateArgument::TemplateExpansion: {
4203 // We have a template type parameter but the template argument
4204 // is a template without any arguments.
4205 SourceRange SR = AL.getSourceRange();
4206 TemplateName Name = Arg.getAsTemplateOrTemplatePattern();
4207 Diag(SR.getBegin(), diag::err_template_missing_args)
4208 << (int)getTemplateNameKindForDiagnostics(Name) << Name << SR;
4209 if (TemplateDecl *Decl = Name.getAsTemplateDecl())
4210 Diag(Decl->getLocation(), diag::note_template_decl_here);
4211
4212 return true;
4213 }
4214 case TemplateArgument::Expression: {
4215 // We have a template type parameter but the template argument is an
4216 // expression; see if maybe it is missing the "typename" keyword.
4217 CXXScopeSpec SS;
4218 DeclarationNameInfo NameInfo;
4219
4220 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
4221 SS.Adopt(ArgExpr->getQualifierLoc());
4222 NameInfo = ArgExpr->getNameInfo();
4223 } else if (DependentScopeDeclRefExpr *ArgExpr =
4224 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
4225 SS.Adopt(ArgExpr->getQualifierLoc());
4226 NameInfo = ArgExpr->getNameInfo();
4227 } else if (CXXDependentScopeMemberExpr *ArgExpr =
4228 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
4229 if (ArgExpr->isImplicitAccess()) {
4230 SS.Adopt(ArgExpr->getQualifierLoc());
4231 NameInfo = ArgExpr->getMemberNameInfo();
4232 }
4233 }
4234
4235 if (auto *II = NameInfo.getName().getAsIdentifierInfo()) {
4236 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
4237 LookupParsedName(Result, CurScope, &SS);
4238
4239 if (Result.getAsSingle<TypeDecl>() ||
4240 Result.getResultKind() ==
4241 LookupResult::NotFoundInCurrentInstantiation) {
4242 // Suggest that the user add 'typename' before the NNS.
4243 SourceLocation Loc = AL.getSourceRange().getBegin();
4244 Diag(Loc, getLangOpts().MSVCCompat
4245 ? diag::ext_ms_template_type_arg_missing_typename
4246 : diag::err_template_arg_must_be_type_suggest)
4247 << FixItHint::CreateInsertion(Loc, "typename ");
4248 Diag(Param->getLocation(), diag::note_template_param_here);
4249
4250 // Recover by synthesizing a type using the location information that we
4251 // already have.
4252 ArgType =
4253 Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II);
4254 TypeLocBuilder TLB;
4255 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType);
4256 TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/));
4257 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4258 TL.setNameLoc(NameInfo.getLoc());
4259 TSI = TLB.getTypeSourceInfo(Context, ArgType);
4260
4261 // Overwrite our input TemplateArgumentLoc so that we can recover
4262 // properly.
4263 AL = TemplateArgumentLoc(TemplateArgument(ArgType),
4264 TemplateArgumentLocInfo(TSI));
4265
4266 break;
4267 }
4268 }
4269 // fallthrough
4270 LLVM_FALLTHROUGH[[clang::fallthrough]];
4271 }
4272 default: {
4273 // We have a template type parameter but the template argument
4274 // is not a type.
4275 SourceRange SR = AL.getSourceRange();
4276 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
4277 Diag(Param->getLocation(), diag::note_template_param_here);
4278
4279 return true;
4280 }
4281 }
4282
4283 if (CheckTemplateArgument(Param, TSI))
4284 return true;
4285
4286 // Add the converted template type argument.
4287 ArgType = Context.getCanonicalType(ArgType);
4288
4289 // Objective-C ARC:
4290 // If an explicitly-specified template argument type is a lifetime type
4291 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
4292 if (getLangOpts().ObjCAutoRefCount &&
4293 ArgType->isObjCLifetimeType() &&
4294 !ArgType.getObjCLifetime()) {
4295 Qualifiers Qs;
4296 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
4297 ArgType = Context.getQualifiedType(ArgType, Qs);
4298 }
4299
4300 Converted.push_back(TemplateArgument(ArgType));
4301 return false;
4302}
4303
4304/// \brief Substitute template arguments into the default template argument for
4305/// the given template type parameter.
4306///
4307/// \param SemaRef the semantic analysis object for which we are performing
4308/// the substitution.
4309///
4310/// \param Template the template that we are synthesizing template arguments
4311/// for.
4312///
4313/// \param TemplateLoc the location of the template name that started the
4314/// template-id we are checking.
4315///
4316/// \param RAngleLoc the location of the right angle bracket ('>') that
4317/// terminates the template-id.
4318///
4319/// \param Param the template template parameter whose default we are
4320/// substituting into.
4321///
4322/// \param Converted the list of template arguments provided for template
4323/// parameters that precede \p Param in the template parameter list.
4324/// \returns the substituted template argument, or NULL if an error occurred.
4325static TypeSourceInfo *
4326SubstDefaultTemplateArgument(Sema &SemaRef,
4327 TemplateDecl *Template,
4328 SourceLocation TemplateLoc,
4329 SourceLocation RAngleLoc,
4330 TemplateTypeParmDecl *Param,
4331 SmallVectorImpl<TemplateArgument> &Converted) {
4332 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
4333
4334 // If the argument type is dependent, instantiate it now based
4335 // on the previously-computed template arguments.
4336 if (ArgType->getType()->isDependentType()) {
4337 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4338 Param, Template, Converted,
4339 SourceRange(TemplateLoc, RAngleLoc));
4340 if (Inst.isInvalid())
4341 return nullptr;
4342
4343 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4344
4345 // Only substitute for the innermost template argument list.
4346 MultiLevelTemplateArgumentList TemplateArgLists;
4347 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4348 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4349 TemplateArgLists.addOuterTemplateArguments(None);
4350
4351 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4352 ArgType =
4353 SemaRef.SubstType(ArgType, TemplateArgLists,
4354 Param->getDefaultArgumentLoc(), Param->getDeclName());
4355 }
4356
4357 return ArgType;
4358}
4359
4360/// \brief Substitute template arguments into the default template argument for
4361/// the given non-type template parameter.
4362///
4363/// \param SemaRef the semantic analysis object for which we are performing
4364/// the substitution.
4365///
4366/// \param Template the template that we are synthesizing template arguments
4367/// for.
4368///
4369/// \param TemplateLoc the location of the template name that started the
4370/// template-id we are checking.
4371///
4372/// \param RAngleLoc the location of the right angle bracket ('>') that
4373/// terminates the template-id.
4374///
4375/// \param Param the non-type template parameter whose default we are
4376/// substituting into.
4377///
4378/// \param Converted the list of template arguments provided for template
4379/// parameters that precede \p Param in the template parameter list.
4380///
4381/// \returns the substituted template argument, or NULL if an error occurred.
4382static ExprResult
4383SubstDefaultTemplateArgument(Sema &SemaRef,
4384 TemplateDecl *Template,
4385 SourceLocation TemplateLoc,
4386 SourceLocation RAngleLoc,
4387 NonTypeTemplateParmDecl *Param,
4388 SmallVectorImpl<TemplateArgument> &Converted) {
4389 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4390 Param, Template, Converted,
4391 SourceRange(TemplateLoc, RAngleLoc));
4392 if (Inst.isInvalid())
4393 return ExprError();
4394
4395 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4396
4397 // Only substitute for the innermost template argument list.
4398 MultiLevelTemplateArgumentList TemplateArgLists;
4399 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4400 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4401 TemplateArgLists.addOuterTemplateArguments(None);
4402
4403 EnterExpressionEvaluationContext ConstantEvaluated(
4404 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4405 return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists);
4406}
4407
4408/// \brief Substitute template arguments into the default template argument for
4409/// the given template template parameter.
4410///
4411/// \param SemaRef the semantic analysis object for which we are performing
4412/// the substitution.
4413///
4414/// \param Template the template that we are synthesizing template arguments
4415/// for.
4416///
4417/// \param TemplateLoc the location of the template name that started the
4418/// template-id we are checking.
4419///
4420/// \param RAngleLoc the location of the right angle bracket ('>') that
4421/// terminates the template-id.
4422///
4423/// \param Param the template template parameter whose default we are
4424/// substituting into.
4425///
4426/// \param Converted the list of template arguments provided for template
4427/// parameters that precede \p Param in the template parameter list.
4428///
4429/// \param QualifierLoc Will be set to the nested-name-specifier (with
4430/// source-location information) that precedes the template name.
4431///
4432/// \returns the substituted template argument, or NULL if an error occurred.
4433static TemplateName
4434SubstDefaultTemplateArgument(Sema &SemaRef,
4435 TemplateDecl *Template,
4436 SourceLocation TemplateLoc,
4437 SourceLocation RAngleLoc,
4438 TemplateTemplateParmDecl *Param,
4439 SmallVectorImpl<TemplateArgument> &Converted,
4440 NestedNameSpecifierLoc &QualifierLoc) {
4441 Sema::InstantiatingTemplate Inst(
4442 SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted,
4443 SourceRange(TemplateLoc, RAngleLoc));
4444 if (Inst.isInvalid())
4445 return TemplateName();
4446
4447 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4448
4449 // Only substitute for the innermost template argument list.
4450 MultiLevelTemplateArgumentList TemplateArgLists;
4451 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4452 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4453 TemplateArgLists.addOuterTemplateArguments(None);
4454
4455 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4456 // Substitute into the nested-name-specifier first,
4457 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
4458 if (QualifierLoc) {
4459 QualifierLoc =
4460 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists);
4461 if (!QualifierLoc)
4462 return TemplateName();
4463 }
4464
4465 return SemaRef.SubstTemplateName(
4466 QualifierLoc,
4467 Param->getDefaultArgument().getArgument().getAsTemplate(),
4468 Param->getDefaultArgument().getTemplateNameLoc(),
4469 TemplateArgLists);
4470}
4471
4472/// \brief If the given template parameter has a default template
4473/// argument, substitute into that default template argument and
4474/// return the corresponding template argument.
4475TemplateArgumentLoc
4476Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
4477 SourceLocation TemplateLoc,
4478 SourceLocation RAngleLoc,
4479 Decl *Param,
4480 SmallVectorImpl<TemplateArgument>
4481 &Converted,
4482 bool &HasDefaultArg) {
4483 HasDefaultArg = false;
4484
4485 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
4486 if (!hasVisibleDefaultArgument(TypeParm))
4487 return TemplateArgumentLoc();
4488
4489 HasDefaultArg = true;
4490 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
4491 TemplateLoc,
4492 RAngleLoc,
4493 TypeParm,
4494 Converted);
4495 if (DI)
4496 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
4497
4498 return TemplateArgumentLoc();
4499 }
4500
4501 if (NonTypeTemplateParmDecl *NonTypeParm
4502 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4503 if (!hasVisibleDefaultArgument(NonTypeParm))
4504 return TemplateArgumentLoc();
4505
4506 HasDefaultArg = true;
4507 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
4508 TemplateLoc,
4509 RAngleLoc,
4510 NonTypeParm,
4511 Converted);
4512 if (Arg.isInvalid())
4513 return TemplateArgumentLoc();
4514
4515 Expr *ArgE = Arg.getAs<Expr>();
4516 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
4517 }
4518
4519 TemplateTemplateParmDecl *TempTempParm
4520 = cast<TemplateTemplateParmDecl>(Param);
4521 if (!hasVisibleDefaultArgument(TempTempParm))
4522 return TemplateArgumentLoc();
4523
4524 HasDefaultArg = true;
4525 NestedNameSpecifierLoc QualifierLoc;
4526 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
4527 TemplateLoc,
4528 RAngleLoc,
4529 TempTempParm,
4530 Converted,
4531 QualifierLoc);
4532 if (TName.isNull())
4533 return TemplateArgumentLoc();
4534
4535 return TemplateArgumentLoc(TemplateArgument(TName),
4536 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
4537 TempTempParm->getDefaultArgument().getTemplateNameLoc());
4538}
4539
4540/// Convert a template-argument that we parsed as a type into a template, if
4541/// possible. C++ permits injected-class-names to perform dual service as
4542/// template template arguments and as template type arguments.
4543static TemplateArgumentLoc convertTypeTemplateArgumentToTemplate(TypeLoc TLoc) {
4544 // Extract and step over any surrounding nested-name-specifier.
4545 NestedNameSpecifierLoc QualLoc;
4546 if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) {
4547 if (ETLoc.getTypePtr()->getKeyword() != ETK_None)
4548 return TemplateArgumentLoc();
4549
4550 QualLoc = ETLoc.getQualifierLoc();
4551 TLoc = ETLoc.getNamedTypeLoc();
4552 }
4553
4554 // If this type was written as an injected-class-name, it can be used as a
4555 // template template argument.
4556 if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>())
4557 return TemplateArgumentLoc(InjLoc.getTypePtr()->getTemplateName(),
4558 QualLoc, InjLoc.getNameLoc());
4559
4560 // If this type was written as an injected-class-name, it may have been
4561 // converted to a RecordType during instantiation. If the RecordType is
4562 // *not* wrapped in a TemplateSpecializationType and denotes a class
4563 // template specialization, it must have come from an injected-class-name.
4564 if (auto RecLoc = TLoc.getAs<RecordTypeLoc>())
4565 if (auto *CTSD =
4566 dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl()))
4567 return TemplateArgumentLoc(TemplateName(CTSD->getSpecializedTemplate()),
4568 QualLoc, RecLoc.getNameLoc());
4569
4570 return TemplateArgumentLoc();
4571}
4572
4573/// \brief Check that the given template argument corresponds to the given
4574/// template parameter.
4575///
4576/// \param Param The template parameter against which the argument will be
4577/// checked.
4578///
4579/// \param Arg The template argument, which may be updated due to conversions.
4580///
4581/// \param Template The template in which the template argument resides.
4582///
4583/// \param TemplateLoc The location of the template name for the template
4584/// whose argument list we're matching.
4585///
4586/// \param RAngleLoc The location of the right angle bracket ('>') that closes
4587/// the template argument list.
4588///
4589/// \param ArgumentPackIndex The index into the argument pack where this
4590/// argument will be placed. Only valid if the parameter is a parameter pack.
4591///
4592/// \param Converted The checked, converted argument will be added to the
4593/// end of this small vector.
4594///
4595/// \param CTAK Describes how we arrived at this particular template argument:
4596/// explicitly written, deduced, etc.
4597///
4598/// \returns true on error, false otherwise.
4599bool Sema::CheckTemplateArgument(NamedDecl *Param,
4600 TemplateArgumentLoc &Arg,
4601 NamedDecl *Template,
4602 SourceLocation TemplateLoc,
4603 SourceLocation RAngleLoc,
4604 unsigned ArgumentPackIndex,
4605 SmallVectorImpl<TemplateArgument> &Converted,
4606 CheckTemplateArgumentKind CTAK) {
4607 // Check template type parameters.
4608 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
4609 return CheckTemplateTypeArgument(TTP, Arg, Converted);
4610
4611 // Check non-type template parameters.
4612 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4613 // Do substitution on the type of the non-type template parameter
4614 // with the template arguments we've seen thus far. But if the
4615 // template has a dependent context then we cannot substitute yet.
4616 QualType NTTPType = NTTP->getType();
4617 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
4618 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
4619
4620 if (NTTPType->isDependentType() &&
4621 !isa<TemplateTemplateParmDecl>(Template) &&
4622 !Template->getDeclContext()->isDependentContext()) {
4623 // Do substitution on the type of the non-type template parameter.
4624 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4625 NTTP, Converted,
4626 SourceRange(TemplateLoc, RAngleLoc));
4627 if (Inst.isInvalid())
4628 return true;
4629
4630 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
4631 Converted);
4632 NTTPType = SubstType(NTTPType,
4633 MultiLevelTemplateArgumentList(TemplateArgs),
4634 NTTP->getLocation(),
4635 NTTP->getDeclName());
4636 // If that worked, check the non-type template parameter type
4637 // for validity.
4638 if (!NTTPType.isNull())
4639 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
4640 NTTP->getLocation());
4641 if (NTTPType.isNull())
4642 return true;
4643 }
4644
4645 switch (Arg.getArgument().getKind()) {
4646 case TemplateArgument::Null:
4647 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-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4647)
;
4648
4649 case TemplateArgument::Expression: {
4650 TemplateArgument Result;
4651 ExprResult Res =
4652 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
4653 Result, CTAK);
4654 if (Res.isInvalid())
4655 return true;
4656
4657 // If the resulting expression is new, then use it in place of the
4658 // old expression in the template argument.
4659 if (Res.get() != Arg.getArgument().getAsExpr()) {
4660 TemplateArgument TA(Res.get());
4661 Arg = TemplateArgumentLoc(TA, Res.get());
4662 }
4663
4664 Converted.push_back(Result);
4665 break;
4666 }
4667
4668 case TemplateArgument::Declaration:
4669 case TemplateArgument::Integral:
4670 case TemplateArgument::NullPtr:
4671 // We've already checked this template argument, so just copy
4672 // it to the list of converted arguments.
4673 Converted.push_back(Arg.getArgument());
4674 break;
4675
4676 case TemplateArgument::Template:
4677 case TemplateArgument::TemplateExpansion:
4678 // We were given a template template argument. It may not be ill-formed;
4679 // see below.
4680 if (DependentTemplateName *DTN
4681 = Arg.getArgument().getAsTemplateOrTemplatePattern()
4682 .getAsDependentTemplateName()) {
4683 // We have a template argument such as \c T::template X, which we
4684 // parsed as a template template argument. However, since we now
4685 // know that we need a non-type template argument, convert this
4686 // template name into an expression.
4687
4688 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
4689 Arg.getTemplateNameLoc());
4690
4691 CXXScopeSpec SS;
4692 SS.Adopt(Arg.getTemplateQualifierLoc());
4693 // FIXME: the template-template arg was a DependentTemplateName,
4694 // so it was provided with a template keyword. However, its source
4695 // location is not stored in the template argument structure.
4696 SourceLocation TemplateKWLoc;
4697 ExprResult E = DependentScopeDeclRefExpr::Create(
4698 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
4699 nullptr);
4700
4701 // If we parsed the template argument as a pack expansion, create a
4702 // pack expansion expression.
4703 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
4704 E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc());
4705 if (E.isInvalid())
4706 return true;
4707 }
4708
4709 TemplateArgument Result;
4710 E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result);
4711 if (E.isInvalid())
4712 return true;
4713
4714 Converted.push_back(Result);
4715 break;
4716 }
4717
4718 // We have a template argument that actually does refer to a class
4719 // template, alias template, or template template parameter, and
4720 // therefore cannot be a non-type template argument.
4721 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
4722 << Arg.getSourceRange();
4723
4724 Diag(Param->getLocation(), diag::note_template_param_here);
4725 return true;
4726
4727 case TemplateArgument::Type: {
4728 // We have a non-type template parameter but the template
4729 // argument is a type.
4730
4731 // C++ [temp.arg]p2:
4732 // In a template-argument, an ambiguity between a type-id and
4733 // an expression is resolved to a type-id, regardless of the
4734 // form of the corresponding template-parameter.
4735 //
4736 // We warn specifically about this case, since it can be rather
4737 // confusing for users.
4738 QualType T = Arg.getArgument().getAsType();
4739 SourceRange SR = Arg.getSourceRange();
4740 if (T->isFunctionType())
4741 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
4742 else
4743 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
4744 Diag(Param->getLocation(), diag::note_template_param_here);
4745 return true;
4746 }
4747
4748 case TemplateArgument::Pack:
4749 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4749)
;
4750 }
4751
4752 return false;
4753 }
4754
4755
4756 // Check template template parameters.
4757 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
4758
4759 // Substitute into the template parameter list of the template
4760 // template parameter, since previously-supplied template arguments
4761 // may appear within the template template parameter.
4762 {
4763 // Set up a template instantiation context.
4764 LocalInstantiationScope Scope(*this);
4765 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4766 TempParm, Converted,
4767 SourceRange(TemplateLoc, RAngleLoc));
4768 if (Inst.isInvalid())
4769 return true;
4770
4771 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4772 TempParm = cast_or_null<TemplateTemplateParmDecl>(
4773 SubstDecl(TempParm, CurContext,
4774 MultiLevelTemplateArgumentList(TemplateArgs)));
4775 if (!TempParm)
4776 return true;
4777 }
4778
4779 // C++1z [temp.local]p1: (DR1004)
4780 // When [the injected-class-name] is used [...] as a template-argument for
4781 // a template template-parameter [...] it refers to the class template
4782 // itself.
4783 if (Arg.getArgument().getKind() == TemplateArgument::Type) {
4784 TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate(
4785 Arg.getTypeSourceInfo()->getTypeLoc());
4786 if (!ConvertedArg.getArgument().isNull())
4787 Arg = ConvertedArg;
4788 }
4789
4790 switch (Arg.getArgument().getKind()) {
4791 case TemplateArgument::Null:
4792 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-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4792)
;
4793
4794 case TemplateArgument::Template:
4795 case TemplateArgument::TemplateExpansion:
4796 if (CheckTemplateArgument(TempParm, Arg, ArgumentPackIndex))
4797 return true;
4798
4799 Converted.push_back(Arg.getArgument());
4800 break;
4801
4802 case TemplateArgument::Expression:
4803 case TemplateArgument::Type:
4804 // We have a template template parameter but the template
4805 // argument does not refer to a template.
4806 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
4807 << getLangOpts().CPlusPlus11;
4808 return true;
4809
4810 case TemplateArgument::Declaration:
4811 llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4811)
;
4812 case TemplateArgument::Integral:
4813 llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4813)
;
4814 case TemplateArgument::NullPtr:
4815 llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4815)
;
4816
4817 case TemplateArgument::Pack:
4818 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4818)
;
4819 }
4820
4821 return false;
4822}
4823
4824/// \brief Diagnose an arity mismatch in the
4825static bool diagnoseArityMismatch(Sema &S, TemplateDecl *Template,
4826 SourceLocation TemplateLoc,
4827 TemplateArgumentListInfo &TemplateArgs) {
4828 TemplateParameterList *Params = Template->getTemplateParameters();
4829 unsigned NumParams = Params->size();
4830 unsigned NumArgs = TemplateArgs.size();
4831
4832 SourceRange Range;
4833 if (NumArgs > NumParams)
4834 Range = SourceRange(TemplateArgs[NumParams].getLocation(),
4835 TemplateArgs.getRAngleLoc());
4836 S.Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
4837 << (NumArgs > NumParams)
4838 << (int)S.getTemplateNameKindForDiagnostics(TemplateName(Template))
4839 << Template << Range;
4840 S.Diag(Template->getLocation(), diag::note_template_decl_here)
4841 << Params->getSourceRange();
4842 return true;
4843}
4844
4845/// \brief Check whether the template parameter is a pack expansion, and if so,
4846/// determine the number of parameters produced by that expansion. For instance:
4847///
4848/// \code
4849/// template<typename ...Ts> struct A {
4850/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
4851/// };
4852/// \endcode
4853///
4854/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
4855/// is not a pack expansion, so returns an empty Optional.
4856static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
4857 if (NonTypeTemplateParmDecl *NTTP
4858 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4859 if (NTTP->isExpandedParameterPack())
4860 return NTTP->getNumExpansionTypes();
4861 }
4862
4863 if (TemplateTemplateParmDecl *TTP
4864 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
4865 if (TTP->isExpandedParameterPack())
4866 return TTP->getNumExpansionTemplateParameters();
4867 }
4868
4869 return None;
4870}
4871
4872/// Diagnose a missing template argument.
4873template<typename TemplateParmDecl>
4874static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc,
4875 TemplateDecl *TD,
4876 const TemplateParmDecl *D,
4877 TemplateArgumentListInfo &Args) {
4878 // Dig out the most recent declaration of the template parameter; there may be
4879 // declarations of the template that are more recent than TD.
4880 D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl())
4881 ->getTemplateParameters()
4882 ->getParam(D->getIndex()));
4883
4884 // If there's a default argument that's not visible, diagnose that we're
4885 // missing a module import.
4886 llvm::SmallVector<Module*, 8> Modules;
4887 if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) {
4888 S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD),
4889 D->getDefaultArgumentLoc(), Modules,
4890 Sema::MissingImportKind::DefaultArgument,
4891 /*Recover*/true);
4892 return true;
4893 }
4894
4895 // FIXME: If there's a more recent default argument that *is* visible,
4896 // diagnose that it was declared too late.
4897
4898 return diagnoseArityMismatch(S, TD, Loc, Args);
4899}
4900
4901/// \brief Check that the given template argument list is well-formed
4902/// for specializing the given template.
4903bool Sema::CheckTemplateArgumentList(
4904 TemplateDecl *Template, SourceLocation TemplateLoc,
4905 TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs,
4906 SmallVectorImpl<TemplateArgument> &Converted,
4907 bool UpdateArgsWithConversions) {
4908 // Make a copy of the template arguments for processing. Only make the
4909 // changes at the end when successful in matching the arguments to the
4910 // template.
4911 TemplateArgumentListInfo NewArgs = TemplateArgs;
4912
4913 // Make sure we get the template parameter list from the most
4914 // recentdeclaration, since that is the only one that has is guaranteed to
4915 // have all the default template argument information.
4916 TemplateParameterList *Params =
4917 cast<TemplateDecl>(Template->getMostRecentDecl())
4918 ->getTemplateParameters();
4919
4920 SourceLocation RAngleLoc = NewArgs.getRAngleLoc();
4921
4922 // C++ [temp.arg]p1:
4923 // [...] The type and form of each template-argument specified in
4924 // a template-id shall match the type and form specified for the
4925 // corresponding parameter declared by the template in its
4926 // template-parameter-list.
4927 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
4928 SmallVector<TemplateArgument, 2> ArgumentPack;
4929 unsigned ArgIdx = 0, NumArgs = NewArgs.size();
4930 LocalInstantiationScope InstScope(*this, true);
4931 for (TemplateParameterList::iterator Param = Params->begin(),
4932 ParamEnd = Params->end();
4933 Param != ParamEnd; /* increment in loop */) {
4934 // If we have an expanded parameter pack, make sure we don't have too
4935 // many arguments.
4936 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
4937 if (*Expansions == ArgumentPack.size()) {
4938 // We're done with this parameter pack. Pack up its arguments and add
4939 // them to the list.
4940 Converted.push_back(
4941 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
4942 ArgumentPack.clear();
4943
4944 // This argument is assigned to the next parameter.
4945 ++Param;
4946 continue;
4947 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
4948 // Not enough arguments for this parameter pack.
4949 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
4950 << false
4951 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
4952 << Template;
4953 Diag(Template->getLocation(), diag::note_template_decl_here)
4954 << Params->getSourceRange();
4955 return true;
4956 }
4957 }
4958
4959 if (ArgIdx < NumArgs) {
4960 // Check the template argument we were given.
4961 if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template,
4962 TemplateLoc, RAngleLoc,
4963 ArgumentPack.size(), Converted))
4964 return true;
4965
4966 bool PackExpansionIntoNonPack =
4967 NewArgs[ArgIdx].getArgument().isPackExpansion() &&
4968 (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param));
4969 if (PackExpansionIntoNonPack && isa<TypeAliasTemplateDecl>(Template)) {
4970 // Core issue 1430: we have a pack expansion as an argument to an
4971 // alias template, and it's not part of a parameter pack. This
4972 // can't be canonicalized, so reject it now.
4973 Diag(NewArgs[ArgIdx].getLocation(),
4974 diag::err_alias_template_expansion_into_fixed_list)
4975 << NewArgs[ArgIdx].getSourceRange();
4976 Diag((*Param)->getLocation(), diag::note_template_param_here);
4977 return true;
4978 }
4979
4980 // We're now done with this argument.
4981 ++ArgIdx;
4982
4983 if ((*Param)->isTemplateParameterPack()) {
4984 // The template parameter was a template parameter pack, so take the
4985 // deduced argument and place it on the argument pack. Note that we
4986 // stay on the same template parameter so that we can deduce more
4987 // arguments.
4988 ArgumentPack.push_back(Converted.pop_back_val());
4989 } else {
4990 // Move to the next template parameter.
4991 ++Param;
4992 }
4993
4994 // If we just saw a pack expansion into a non-pack, then directly convert
4995 // the remaining arguments, because we don't know what parameters they'll
4996 // match up with.
4997 if (PackExpansionIntoNonPack) {
4998 if (!ArgumentPack.empty()) {
4999 // If we were part way through filling in an expanded parameter pack,
5000 // fall back to just producing individual arguments.
5001 Converted.insert(Converted.end(),
5002 ArgumentPack.begin(), ArgumentPack.end());
5003 ArgumentPack.clear();
5004 }
5005
5006 while (ArgIdx < NumArgs) {
5007 Converted.push_back(NewArgs[ArgIdx].getArgument());
5008 ++ArgIdx;
5009 }
5010
5011 return false;
5012 }
5013
5014 continue;
5015 }
5016
5017 // If we're checking a partial template argument list, we're done.
5018 if (PartialTemplateArgs) {
5019 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
5020 Converted.push_back(
5021 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5022
5023 return false;
5024 }
5025
5026 // If we have a template parameter pack with no more corresponding
5027 // arguments, just break out now and we'll fill in the argument pack below.
5028 if ((*Param)->isTemplateParameterPack()) {
5029 assert(!getExpandedPackSize(*Param) &&(static_cast <bool> (!getExpandedPackSize(*Param) &&
"Should have dealt with this already") ? void (0) : __assert_fail
("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5030, __extension__ __PRETTY_FUNCTION__))
5030 "Should have dealt with this already")(static_cast <bool> (!getExpandedPackSize(*Param) &&
"Should have dealt with this already") ? void (0) : __assert_fail
("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5030, __extension__ __PRETTY_FUNCTION__))
;
5031
5032 // A non-expanded parameter pack before the end of the parameter list
5033 // only occurs for an ill-formed template parameter list, unless we've
5034 // got a partial argument list for a function template, so just bail out.
5035 if (Param + 1 != ParamEnd)
5036 return true;
5037
5038 Converted.push_back(
5039 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5040 ArgumentPack.clear();
5041
5042 ++Param;
5043 continue;
5044 }
5045
5046 // Check whether we have a default argument.
5047 TemplateArgumentLoc Arg;
5048
5049 // Retrieve the default template argument from the template
5050 // parameter. For each kind of template parameter, we substitute the
5051 // template arguments provided thus far and any "outer" template arguments
5052 // (when the template parameter was part of a nested template) into
5053 // the default argument.
5054 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
5055 if (!hasVisibleDefaultArgument(TTP))
5056 return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP,
5057 NewArgs);
5058
5059 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
5060 Template,
5061 TemplateLoc,
5062 RAngleLoc,
5063 TTP,
5064 Converted);
5065 if (!ArgType)
5066 return true;
5067
5068 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
5069 ArgType);
5070 } else if (NonTypeTemplateParmDecl *NTTP
5071 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
5072 if (!hasVisibleDefaultArgument(NTTP))
5073 return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP,
5074 NewArgs);
5075
5076 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
5077 TemplateLoc,
5078 RAngleLoc,
5079 NTTP,
5080 Converted);
5081 if (E.isInvalid())
5082 return true;
5083
5084 Expr *Ex = E.getAs<Expr>();
5085 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
5086 } else {
5087 TemplateTemplateParmDecl *TempParm
5088 = cast<TemplateTemplateParmDecl>(*Param);
5089
5090 if (!hasVisibleDefaultArgument(TempParm))
5091 return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm,
5092 NewArgs);
5093
5094 NestedNameSpecifierLoc QualifierLoc;
5095 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
5096 TemplateLoc,
5097 RAngleLoc,
5098 TempParm,
5099 Converted,
5100 QualifierLoc);
5101 if (Name.isNull())
5102 return true;
5103
5104 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
5105 TempParm->getDefaultArgument().getTemplateNameLoc());
5106 }
5107
5108 // Introduce an instantiation record that describes where we are using
5109 // the default template argument. We're not actually instantiating a
5110 // template here, we just create this object to put a note into the
5111 // context stack.
5112 InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted,
5113 SourceRange(TemplateLoc, RAngleLoc));
5114 if (Inst.isInvalid())
5115 return true;
5116
5117 // Check the default template argument.
5118 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
5119 RAngleLoc, 0, Converted))
5120 return true;
5121
5122 // Core issue 150 (assumed resolution): if this is a template template
5123 // parameter, keep track of the default template arguments from the
5124 // template definition.
5125 if (isTemplateTemplateParameter)
5126 NewArgs.addArgument(Arg);
5127
5128 // Move to the next template parameter and argument.
5129 ++Param;
5130 ++ArgIdx;
5131 }
5132
5133 // If we're performing a partial argument substitution, allow any trailing
5134 // pack expansions; they might be empty. This can happen even if
5135 // PartialTemplateArgs is false (the list of arguments is complete but
5136 // still dependent).
5137 if (ArgIdx < NumArgs && CurrentInstantiationScope &&
5138 CurrentInstantiationScope->getPartiallySubstitutedPack()) {
5139 while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion())
5140 Converted.push_back(NewArgs[ArgIdx++].getArgument());
5141 }
5142
5143 // If we have any leftover arguments, then there were too many arguments.
5144 // Complain and fail.
5145 if (ArgIdx < NumArgs)
5146 return diagnoseArityMismatch(*this, Template, TemplateLoc, NewArgs);
5147
5148 // No problems found with the new argument list, propagate changes back
5149 // to caller.
5150 if (UpdateArgsWithConversions)
5151 TemplateArgs = std::move(NewArgs);
5152
5153 return false;
5154}
5155
5156namespace {
5157 class UnnamedLocalNoLinkageFinder
5158 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
5159 {
5160 Sema &S;
5161 SourceRange SR;
5162
5163 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
5164
5165 public:
5166 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
5167
5168 bool Visit(QualType T) {
5169 return T.isNull() ? false : inherited::Visit(T.getTypePtr());
5170 }
5171
5172#define TYPE(Class, Parent) \
5173 bool Visit##Class##Type(const Class##Type *);
5174#define ABSTRACT_TYPE(Class, Parent) \
5175 bool Visit##Class##Type(const Class##Type *) { return false; }
5176#define NON_CANONICAL_TYPE(Class, Parent) \
5177 bool Visit##Class##Type(const Class##Type *) { return false; }
5178#include "clang/AST/TypeNodes.def"
5179
5180 bool VisitTagDecl(const TagDecl *Tag);
5181 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
5182 };
5183} // end anonymous namespace
5184
5185bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
5186 return false;
5187}
5188
5189bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
5190 return Visit(T->getElementType());
5191}
5192
5193bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
5194 return Visit(T->getPointeeType());
5195}
5196
5197bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
5198 const BlockPointerType* T) {
5199 return Visit(T->getPointeeType());
5200}
5201
5202bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
5203 const LValueReferenceType* T) {
5204 return Visit(T->getPointeeType());
5205}
5206
5207bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
5208 const RValueReferenceType* T) {
5209 return Visit(T->getPointeeType());
5210}
5211
5212bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
5213 const MemberPointerType* T) {
5214 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
5215}
5216
5217bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
5218 const ConstantArrayType* T) {
5219 return Visit(T->getElementType());
5220}
5221
5222bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
5223 const IncompleteArrayType* T) {
5224 return Visit(T->getElementType());
5225}
5226
5227bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
5228 const VariableArrayType* T) {
5229 return Visit(T->getElementType());
5230}
5231
5232bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
5233 const DependentSizedArrayType* T) {
5234 return Visit(T->getElementType());
5235}
5236
5237bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
5238 const DependentSizedExtVectorType* T) {
5239 return Visit(T->getElementType());
5240}
5241
5242bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType(
5243 const DependentAddressSpaceType *T) {
5244 return Visit(T->getPointeeType());
5245}
5246
5247bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
5248 return Visit(T->getElementType());
5249}
5250
5251bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
5252 return Visit(T->getElementType());
5253}
5254
5255bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
5256 const FunctionProtoType* T) {
5257 for (const auto &A : T->param_types()) {
5258 if (Visit(A))
5259 return true;
5260 }
5261
5262 return Visit(T->getReturnType());
5263}
5264
5265bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
5266 const FunctionNoProtoType* T) {
5267 return Visit(T->getReturnType());
5268}
5269
5270bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
5271 const UnresolvedUsingType*) {
5272 return false;
5273}
5274
5275bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
5276 return false;
5277}
5278
5279bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
5280 return Visit(T->getUnderlyingType());
5281}
5282
5283bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
5284 return false;
5285}
5286
5287bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
5288 const UnaryTransformType*) {
5289 return false;
5290}
5291
5292bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
5293 return Visit(T->getDeducedType());
5294}
5295
5296bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType(
5297 const DeducedTemplateSpecializationType *T) {
5298 return Visit(T->getDeducedType());
5299}
5300
5301bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
5302 return VisitTagDecl(T->getDecl());
5303}
5304
5305bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
5306 return VisitTagDecl(T->getDecl());
5307}
5308
5309bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
5310 const TemplateTypeParmType*) {
5311 return false;
5312}
5313
5314bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
5315 const SubstTemplateTypeParmPackType *) {
5316 return false;
5317}
5318
5319bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
5320 const TemplateSpecializationType*) {
5321 return false;
5322}
5323
5324bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
5325 const InjectedClassNameType* T) {
5326 return VisitTagDecl(T->getDecl());
5327}
5328
5329bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
5330 const DependentNameType* T) {
5331 return VisitNestedNameSpecifier(T->getQualifier());
5332}
5333
5334bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
5335 const DependentTemplateSpecializationType* T) {
5336 return VisitNestedNameSpecifier(T->getQualifier());
5337}
5338
5339bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
5340 const PackExpansionType* T) {
5341 return Visit(T->getPattern());
5342}
5343
5344bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
5345 return false;
5346}
5347
5348bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
5349 const ObjCInterfaceType *) {
5350 return false;
5351}
5352
5353bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
5354 const ObjCObjectPointerType *) {
5355 return false;
5356}
5357
5358bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
5359 return Visit(T->getValueType());
5360}
5361
5362bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) {
5363 return false;
5364}
5365
5366bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
5367 if (Tag->getDeclContext()->isFunctionOrMethod()) {
5368 S.Diag(SR.getBegin(),
5369 S.getLangOpts().CPlusPlus11 ?
5370 diag::warn_cxx98_compat_template_arg_local_type :
5371 diag::ext_template_arg_local_type)
5372 << S.Context.getTypeDeclType(Tag) << SR;
5373 return true;
5374 }
5375
5376 if (!Tag->hasNameForLinkage()) {
5377 S.Diag(SR.getBegin(),
5378 S.getLangOpts().CPlusPlus11 ?
5379 diag::warn_cxx98_compat_template_arg_unnamed_type :
5380 diag::ext_template_arg_unnamed_type) << SR;
5381 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
5382 return true;
5383 }
5384
5385 return false;
5386}
5387
5388bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
5389 NestedNameSpecifier *NNS) {
5390 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
5391 return true;
5392
5393 switch (NNS->getKind()) {
5394 case NestedNameSpecifier::Identifier:
5395 case NestedNameSpecifier::Namespace:
5396 case NestedNameSpecifier::NamespaceAlias:
5397 case NestedNameSpecifier::Global:
5398 case NestedNameSpecifier::Super:
5399 return false;
5400
5401 case NestedNameSpecifier::TypeSpec:
5402 case NestedNameSpecifier::TypeSpecWithTemplate:
5403 return Visit(QualType(NNS->getAsType(), 0));
5404 }
5405 llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5405)
;
5406}
5407
5408/// \brief Check a template argument against its corresponding
5409/// template type parameter.
5410///
5411/// This routine implements the semantics of C++ [temp.arg.type]. It
5412/// returns true if an error occurred, and false otherwise.
5413bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
5414 TypeSourceInfo *ArgInfo) {
5415 assert(ArgInfo && "invalid TypeSourceInfo")(static_cast <bool> (ArgInfo && "invalid TypeSourceInfo"
) ? void (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5415, __extension__ __PRETTY_FUNCTION__))
;
5416 QualType Arg = ArgInfo->getType();
5417 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
5418
5419 if (Arg->isVariablyModifiedType()) {
5420 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
5421 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
5422 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
5423 }
5424
5425 // C++03 [temp.arg.type]p2:
5426 // A local type, a type with no linkage, an unnamed type or a type
5427 // compounded from any of these types shall not be used as a
5428 // template-argument for a template type-parameter.
5429 //
5430 // C++11 allows these, and even in C++03 we allow them as an extension with
5431 // a warning.
5432 if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) {
5433 UnnamedLocalNoLinkageFinder Finder(*this, SR);
5434 (void)Finder.Visit(Context.getCanonicalType(Arg));
5435 }
5436
5437 return false;
5438}
5439
5440enum NullPointerValueKind {
5441 NPV_NotNullPointer,
5442 NPV_NullPointer,
5443 NPV_Error
5444};
5445
5446/// \brief Determine whether the given template argument is a null pointer
5447/// value of the appropriate type.
5448static NullPointerValueKind
5449isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
5450 QualType ParamType, Expr *Arg,
5451 Decl *Entity = nullptr) {
5452 if (Arg->isValueDependent() || Arg->isTypeDependent())
5453 return NPV_NotNullPointer;
5454
5455 // dllimport'd entities aren't constant but are available inside of template
5456 // arguments.
5457 if (Entity && Entity->hasAttr<DLLImportAttr>())
5458 return NPV_NotNullPointer;
5459
5460 if (!S.isCompleteType(Arg->getExprLoc(), ParamType))
5461 llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5462)
5462 "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5462)
;
5463
5464 if (!S.getLangOpts().CPlusPlus11)
5465 return NPV_NotNullPointer;
5466
5467 // Determine whether we have a constant expression.
5468 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
5469 if (ArgRV.isInvalid())
5470 return NPV_Error;
5471 Arg = ArgRV.get();
5472
5473 Expr::EvalResult EvalResult;
5474 SmallVector<PartialDiagnosticAt, 8> Notes;
5475 EvalResult.Diag = &Notes;
5476 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
5477 EvalResult.HasSideEffects) {
5478 SourceLocation DiagLoc = Arg->getExprLoc();
5479
5480 // If our only note is the usual "invalid subexpression" note, just point
5481 // the caret at its location rather than producing an essentially
5482 // redundant note.
5483 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
5484 diag::note_invalid_subexpr_in_const_expr) {
5485 DiagLoc = Notes[0].first;
5486 Notes.clear();
5487 }
5488
5489 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
5490 << Arg->getType() << Arg->getSourceRange();
5491 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
5492 S.Diag(Notes[I].first, Notes[I].second);
5493
5494 S.Diag(Param->getLocation(), diag::note_template_param_here);
5495 return NPV_Error;
5496 }
5497
5498 // C++11 [temp.arg.nontype]p1:
5499 // - an address constant expression of type std::nullptr_t
5500 if (Arg->getType()->isNullPtrType())
5501 return NPV_NullPointer;
5502
5503 // - a constant expression that evaluates to a null pointer value (4.10); or
5504 // - a constant expression that evaluates to a null member pointer value
5505 // (4.11); or
5506 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
5507 (EvalResult.Val.isMemberPointer() &&
5508 !EvalResult.Val.getMemberPointerDecl())) {
5509 // If our expression has an appropriate type, we've succeeded.
5510 bool ObjCLifetimeConversion;
5511 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
5512 S.IsQualificationConversion(Arg->getType(), ParamType, false,
5513 ObjCLifetimeConversion))
5514 return NPV_NullPointer;
5515
5516 // The types didn't match, but we know we got a null pointer; complain,
5517 // then recover as if the types were correct.
5518 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
5519 << Arg->getType() << ParamType << Arg->getSourceRange();
5520 S.Diag(Param->getLocation(), diag::note_template_param_here);
5521 return NPV_NullPointer;
5522 }
5523
5524 // If we don't have a null pointer value, but we do have a NULL pointer
5525 // constant, suggest a cast to the appropriate type.
5526 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
5527 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
5528 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
5529 << ParamType << FixItHint::CreateInsertion(Arg->getLocStart(), Code)
5530 << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getLocEnd()),
5531 ")");
5532 S.Diag(Param->getLocation(), diag::note_template_param_here);
5533 return NPV_NullPointer;
5534 }
5535
5536 // FIXME: If we ever want to support general, address-constant expressions
5537 // as non-type template arguments, we should return the ExprResult here to
5538 // be interpreted by the caller.
5539 return NPV_NotNullPointer;
5540}
5541
5542/// \brief Checks whether the given template argument is compatible with its
5543/// template parameter.
5544static bool CheckTemplateArgumentIsCompatibleWithParameter(
5545 Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn,
5546 Expr *Arg, QualType ArgType) {
5547 bool ObjCLifetimeConversion;
5548 if (ParamType->isPointerType() &&
5549 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
5550 S.IsQualificationConversion(ArgType, ParamType, false,
5551 ObjCLifetimeConversion)) {
5552 // For pointer-to-object types, qualification conversions are
5553 // permitted.
5554 } else {
5555 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
5556 if (!ParamRef->getPointeeType()->isFunctionType()) {
5557 // C++ [temp.arg.nontype]p5b3:
5558 // For a non-type template-parameter of type reference to
5559 // object, no conversions apply. The type referred to by the
5560 // reference may be more cv-qualified than the (otherwise
5561 // identical) type of the template- argument. The
5562 // template-parameter is bound directly to the
5563 // template-argument, which shall be an lvalue.
5564
5565 // FIXME: Other qualifiers?
5566 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
5567 unsigned ArgQuals = ArgType.getCVRQualifiers();
5568
5569 if ((ParamQuals | ArgQuals) != ParamQuals) {
5570 S.Diag(Arg->getLocStart(),
5571 diag::err_template_arg_ref_bind_ignores_quals)
5572 << ParamType << Arg->getType() << Arg->getSourceRange();
5573 S.Diag(Param->getLocation(), diag::note_template_param_here);
5574 return true;
5575 }
5576 }
5577 }
5578
5579 // At this point, the template argument refers to an object or
5580 // function with external linkage. We now need to check whether the
5581 // argument and parameter types are compatible.
5582 if (!S.Context.hasSameUnqualifiedType(ArgType,
5583 ParamType.getNonReferenceType())) {
5584 // We can't perform this conversion or binding.
5585 if (ParamType->isReferenceType())
5586 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
5587 << ParamType << ArgIn->getType() << Arg->getSourceRange();
5588 else
5589 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
5590 << ArgIn->getType() << ParamType << Arg->getSourceRange();
5591 S.Diag(Param->getLocation(), diag::note_template_param_here);
5592 return true;
5593 }
5594 }
5595
5596 return false;
5597}
5598
5599/// \brief Checks whether the given template argument is the address
5600/// of an object or function according to C++ [temp.arg.nontype]p1.
5601static bool
5602CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
5603 NonTypeTemplateParmDecl *Param,
5604 QualType ParamType,
5605 Expr *ArgIn,
5606 TemplateArgument &Converted) {
5607 bool Invalid = false;
5608 Expr *Arg = ArgIn;
5609 QualType ArgType = Arg->getType();
5610
5611 bool AddressTaken = false;
5612 SourceLocation AddrOpLoc;
5613 if (S.getLangOpts().MicrosoftExt) {
5614 // Microsoft Visual C++ strips all casts, allows an arbitrary number of
5615 // dereference and address-of operators.
5616 Arg = Arg->IgnoreParenCasts();
5617
5618 bool ExtWarnMSTemplateArg = false;
5619 UnaryOperatorKind FirstOpKind;
5620 SourceLocation FirstOpLoc;
5621 while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5622 UnaryOperatorKind UnOpKind = UnOp->getOpcode();
5623 if (UnOpKind == UO_Deref)
5624 ExtWarnMSTemplateArg = true;
5625 if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) {
5626 Arg = UnOp->getSubExpr()->IgnoreParenCasts();
5627 if (!AddrOpLoc.isValid()) {
5628 FirstOpKind = UnOpKind;
5629 FirstOpLoc = UnOp->getOperatorLoc();
5630 }
5631 } else
5632 break;
5633 }
5634 if (FirstOpLoc.isValid()) {
5635 if (ExtWarnMSTemplateArg)
5636 S.Diag(ArgIn->getLocStart(), diag::ext_ms_deref_template_argument)
5637 << ArgIn->getSourceRange();
5638
5639 if (FirstOpKind == UO_AddrOf)
5640 AddressTaken = true;
5641 else if (Arg->getType()->isPointerType()) {
5642 // We cannot let pointers get dereferenced here, that is obviously not a
5643 // constant expression.
5644 assert(FirstOpKind == UO_Deref)(static_cast <bool> (FirstOpKind == UO_Deref) ? void (0
) : __assert_fail ("FirstOpKind == UO_Deref", "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5644, __extension__ __PRETTY_FUNCTION__))
;
5645 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
5646 << Arg->getSourceRange();
5647 }
5648 }
5649 } else {
5650 // See through any implicit casts we added to fix the type.
5651 Arg = Arg->IgnoreImpCasts();
5652
5653 // C++ [temp.arg.nontype]p1:
5654 //
5655 // A template-argument for a non-type, non-template
5656 // template-parameter shall be one of: [...]
5657 //
5658 // -- the address of an object or function with external
5659 // linkage, including function templates and function
5660 // template-ids but excluding non-static class members,
5661 // expressed as & id-expression where the & is optional if
5662 // the name refers to a function or array, or if the
5663 // corresponding template-parameter is a reference; or
5664
5665 // In C++98/03 mode, give an extension warning on any extra parentheses.
5666 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
5667 bool ExtraParens = false;
5668 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
5669 if (!Invalid && !ExtraParens) {
5670 S.Diag(Arg->getLocStart(),
5671 S.getLangOpts().CPlusPlus11
5672 ? diag::warn_cxx98_compat_template_arg_extra_parens
5673 : diag::ext_template_arg_extra_parens)
5674 << Arg->getSourceRange();
5675 ExtraParens = true;
5676 }
5677
5678 Arg = Parens->getSubExpr();
5679 }
5680
5681 while (SubstNonTypeTemplateParmExpr *subst =
5682 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5683 Arg = subst->getReplacement()->IgnoreImpCasts();
5684
5685 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5686 if (UnOp->getOpcode() == UO_AddrOf) {
5687 Arg = UnOp->getSubExpr();
5688 AddressTaken = true;
5689 AddrOpLoc = UnOp->getOperatorLoc();
5690 }
5691 }
5692
5693 while (SubstNonTypeTemplateParmExpr *subst =
5694 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5695 Arg = subst->getReplacement()->IgnoreImpCasts();
5696 }
5697
5698 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
5699 ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr;
5700
5701 // If our parameter has pointer type, check for a null template value.
5702 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
5703 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn,
5704 Entity)) {
5705 case NPV_NullPointer:
5706 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
5707 Converted = TemplateArgument(S.Context.getCanonicalType(ParamType),
5708 /*isNullPtr=*/true);
5709 return false;
5710
5711 case NPV_Error:
5712 return true;
5713
5714 case NPV_NotNullPointer:
5715 break;
5716 }
5717 }
5718
5719 // Stop checking the precise nature of the argument if it is value dependent,
5720 // it should be checked when instantiated.
5721 if (Arg->isValueDependent()) {
5722 Converted = TemplateArgument(ArgIn);
5723 return false;
5724 }
5725
5726 if (isa<CXXUuidofExpr>(Arg)) {
5727 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType,
5728 ArgIn, Arg, ArgType))
5729 return true;
5730
5731 Converted = TemplateArgument(ArgIn);
5732 return false;
5733 }
5734
5735 if (!DRE) {
5736 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
5737 << Arg->getSourceRange();
5738 S.Diag(Param->getLocation(), diag::note_template_param_here);
5739 return true;
5740 }
5741
5742 // Cannot refer to non-static data members
5743 if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) {
5744 S.Diag(Arg->getLocStart(), diag::err_template_arg_field)
5745 << Entity << Arg->getSourceRange();
5746 S.Diag(Param->getLocation(), diag::note_template_param_here);
5747 return true;
5748 }
5749
5750 // Cannot refer to non-static member functions
5751 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
5752 if (!Method->isStatic()) {
5753 S.Diag(Arg->getLocStart(), diag::err_template_arg_method)
5754 << Method << Arg->getSourceRange();
5755 S.Diag(Param->getLocation(), diag::note_template_param_here);
5756 return true;
5757 }
5758 }
5759
5760 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
5761 VarDecl *Var = dyn_cast<VarDecl>(Entity);
5762
5763 // A non-type template argument must refer to an object or function.
5764 if (!Func && !Var) {
5765 // We found something, but we don't know specifically what it is.
5766 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_object_or_func)
5767 << Arg->getSourceRange();
5768 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
5769 return true;
5770 }
5771
5772 // Address / reference template args must have external linkage in C++98.
5773 if (Entity->getFormalLinkage() == InternalLinkage) {
5774 S.Diag(Arg->getLocStart(), S.getLangOpts().CPlusPlus11 ?
5775 diag::warn_cxx98_compat_template_arg_object_internal :
5776 diag::ext_template_arg_object_internal)
5777 << !Func << Entity << Arg->getSourceRange();
5778 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5779 << !Func;
5780 } else if (!Entity->hasLinkage()) {
5781 S.Diag(Arg->getLocStart(), diag::err_template_arg_object_no_linkage)
5782 << !Func << Entity << Arg->getSourceRange();
5783 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5784 << !Func;
5785 return true;
5786 }
5787
5788 if (Func) {
5789 // If the template parameter has pointer type, the function decays.
5790 if (ParamType->isPointerType() && !AddressTaken)
5791 ArgType = S.Context.getPointerType(Func->getType());
5792 else if (AddressTaken && ParamType->isReferenceType()) {
5793 // If we originally had an address-of operator, but the
5794 // parameter has reference type, complain and (if things look
5795 // like they will work) drop the address-of operator.
5796 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
5797 ParamType.getNonReferenceType())) {
5798 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5799 << ParamType;
5800 S.Diag(Param->getLocation(), diag::note_template_param_here);
5801 return true;
5802 }
5803
5804 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5805 << ParamType
5806 << FixItHint::CreateRemoval(AddrOpLoc);
5807 S.Diag(Param->getLocation(), diag::note_template_param_here);
5808
5809 ArgType = Func->getType();
5810 }
5811 } else {
5812 // A value of reference type is not an object.
5813 if (Var->getType()->isReferenceType()) {
5814 S.Diag(Arg->getLocStart(),
5815 diag::err_template_arg_reference_var)
5816 << Var->getType() << Arg->getSourceRange();
5817 S.Diag(Param->getLocation(), diag::note_template_param_here);
5818 return true;
5819 }
5820
5821 // A template argument must have static storage duration.
5822 if (Var->getTLSKind()) {
5823 S.Diag(Arg->getLocStart(), diag::err_template_arg_thread_local)
5824 << Arg->getSourceRange();
5825 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
5826 return true;
5827 }
5828
5829 // If the template parameter has pointer type, we must have taken
5830 // the address of this object.
5831 if (ParamType->isReferenceType()) {
5832 if (AddressTaken) {
5833 // If we originally had an address-of operator, but the
5834 // parameter has reference type, complain and (if things look
5835 // like they will work) drop the address-of operator.
5836 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
5837 ParamType.getNonReferenceType())) {
5838 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5839 << ParamType;
5840 S.Diag(Param->getLocation(), diag::note_template_param_here);
5841 return true;
5842 }
5843
5844 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5845 << ParamType
5846 << FixItHint::CreateRemoval(AddrOpLoc);
5847 S.Diag(Param->getLocation(), diag::note_template_param_here);
5848
5849 ArgType = Var->getType();
5850 }
5851 } else if (!AddressTaken && ParamType->isPointerType()) {
5852 if (Var->getType()->isArrayType()) {
5853 // Array-to-pointer decay.
5854 ArgType = S.Context.getArrayDecayedType(Var->getType());
5855 } else {
5856 // If the template parameter has pointer type but the address of
5857 // this object was not taken, complain and (possibly) recover by
5858 // taking the address of the entity.
5859 ArgType = S.Context.getPointerType(Var->getType());
5860 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
5861 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
5862 << ParamType;
5863 S.Diag(Param->getLocation(), diag::note_template_param_here);
5864 return true;
5865 }
5866
5867 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
5868 << ParamType
5869 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
5870
5871 S.Diag(Param->getLocation(), diag::note_template_param_here);
5872 }
5873 }
5874 }
5875
5876 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn,
5877 Arg, ArgType))
5878 return true;
5879
5880 // Create the template argument.
5881 Converted =
5882 TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), ParamType);
5883 S.MarkAnyDeclReferenced(Arg->getLocStart(), Entity, false);
5884 return false;
5885}
5886
5887/// \brief Checks whether the given template argument is a pointer to
5888/// member constant according to C++ [temp.arg.nontype]p1.
5889static bool CheckTemplateArgumentPointerToMember(Sema &S,
5890 NonTypeTemplateParmDecl *Param,
5891 QualType ParamType,
5892 Expr *&ResultArg,
5893 TemplateArgument &Converted) {
5894 bool Invalid = false;
5895
5896 Expr *Arg = ResultArg;
5897 bool ObjCLifetimeConversion;
5898
5899 // C++ [temp.arg.nontype]p1:
5900 //
5901 // A template-argument for a non-type, non-template
5902 // template-parameter shall be one of: [...]
5903 //
5904 // -- a pointer to member expressed as described in 5.3.1.
5905 DeclRefExpr *DRE = nullptr;
5906
5907 // In C++98/03 mode, give an extension warning on any extra parentheses.
5908 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
5909 bool ExtraParens = false;
5910 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
5911 if (!Invalid && !ExtraParens) {
5912 S.Diag(Arg->getLocStart(),
5913 S.getLangOpts().CPlusPlus11 ?
5914 diag::warn_cxx98_compat_template_arg_extra_parens :
5915 diag::ext_template_arg_extra_parens)
5916 << Arg->getSourceRange();
5917 ExtraParens = true;
5918 }
5919
5920 Arg = Parens->getSubExpr();
5921 }
5922
5923 while (SubstNonTypeTemplateParmExpr *subst =
5924 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5925 Arg = subst->getReplacement()->IgnoreImpCasts();
5926
5927 // A pointer-to-member constant written &Class::member.
5928 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5929 if (UnOp->getOpcode() == UO_AddrOf) {
5930 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
5931 if (DRE && !DRE->getQualifier())
5932 DRE = nullptr;
5933 }
5934 }
5935 // A constant of pointer-to-member type.
5936 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
5937 ValueDecl *VD = DRE->getDecl();
5938 if (VD->getType()->isMemberPointerType()) {
5939 if (isa<NonTypeTemplateParmDecl>(VD)) {
5940 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
5941 Converted = TemplateArgument(Arg);
5942 } else {
5943 VD = cast<ValueDecl>(VD->getCanonicalDecl());
5944 Converted = TemplateArgument(VD, ParamType);
5945 }
5946 return Invalid;
5947 }
5948 }
5949
5950 DRE = nullptr;
5951 }
5952
5953 ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr;
5954
5955 // Check for a null pointer value.
5956 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ResultArg,
5957 Entity)) {
5958 case NPV_Error:
5959 return true;
5960 case NPV_NullPointer:
5961 S.Diag(ResultArg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
5962 Converted = TemplateArgument(S.Context.getCanonicalType(ParamType),
5963 /*isNullPtr*/true);
5964 return false;
5965 case NPV_NotNullPointer:
5966 break;
5967 }
5968
5969 if (S.IsQualificationConversion(ResultArg->getType(),
5970 ParamType.getNonReferenceType(), false,
5971 ObjCLifetimeConversion)) {
5972 ResultArg = S.ImpCastExprToType(ResultArg, ParamType, CK_NoOp,
5973 ResultArg->getValueKind())
5974 .get();
5975 } else if (!S.Context.hasSameUnqualifiedType(
5976 ResultArg->getType(), ParamType.getNonReferenceType())) {
5977 // We can't perform this conversion.
5978 S.Diag(ResultArg->getLocStart(), diag::err_template_arg_not_convertible)
5979 << ResultArg->getType() << ParamType << ResultArg->getSourceRange();
5980 S.Diag(Param->getLocation(), diag::note_template_param_here);
5981 return true;
5982 }
5983
5984 if (!DRE)
5985 return S.Diag(Arg->getLocStart(),
5986 diag::err_template_arg_not_pointer_to_member_form)
5987 << Arg->getSourceRange();
5988
5989 if (isa<FieldDecl>(DRE->getDecl()) ||
5990 isa<IndirectFieldDecl>(DRE->getDecl()) ||
5991 isa<CXXMethodDecl>(DRE->getDecl())) {
5992 assert((isa<FieldDecl>(DRE->getDecl()) ||(static_cast <bool> ((isa<FieldDecl>(DRE->getDecl
()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast
<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
"Only non-static member pointers can make it here") ? void (
0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5995, __extension__ __PRETTY_FUNCTION__))
5993 isa<IndirectFieldDecl>(DRE->getDecl()) ||(static_cast <bool> ((isa<FieldDecl>(DRE->getDecl
()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast
<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
"Only non-static member pointers can make it here") ? void (
0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\""
, "/build/llvm-toolchain-snapshot-7~svn326551/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5995, __extension__ __PRETTY_FUNCTION__))
5994 !cast<